JPH1054199A - Flexible segment - Google Patents

Abstract

(57) [Summary] [Problem] The construction can be performed by the same construction procedure as ordinary segment, no special process and labor is required for construction, and the lining of the constructed tunnel is damaged even by large displacement of the ground It can be made to follow without displacement. SOLUTION: A rubber piece (1) formed in a segment shape is provided.
The steel segment bodies (20a, 20b) are juxtaposed on both sides of (0), and the rubber piece (10) is sandwiched between the steel segment bodies (20a, 20b). The two steel segment bodies (20a, 20b) are connected to the inner main girders (21b, 21b) of the inside of the rubber piece (10) and the both steel segment bodies (20a, 20b).
b) and a plurality of connecting rods (30, 30, 30,.
), The two steel segment bodies (20a, 20b) are connected so as to removably hold the state in which the rubber pieces (10) are temporarily compressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible segment used for absorbing displacement when lining a tunnel at a site where large displacement is expected. In addition, for the purpose of absorbing the vibration of the tunnel lining in the event of an earthquake, it is sometimes called a seismic isolation segment, but at the present time, they both mean the same thing.

Conventionally, as this kind of flexible segment, those shown in FIGS. 16 to 19 are widely used. In the flexible segment of this conventional example, a pair of steel frame segment bodies 20A, 20A are juxtaposed at a predetermined interval, and the space therebetween is temporarily connected by a connecting piece 50.

[0003] The flexible segment of this conventional example is assembled into a segment ring while both steel frame segment bodies 20A, 20A are temporarily connected by connecting pieces 50.
In FIG. 16, S is a normal segment, 100 is a shield machine (the shield machine excavates a tunnel toward the right in FIG. 16), 101 is a tail seal,
The flexible segment is connected to the normal segment S, S, S... In the same manner as the normal segment S, S, S. Assembled in a ring shape (in front of the tunnel excavation direction).

[0004] When the segment ring is assembled with the flexible segment, the primary waterproof rubber 40a is attached (in the state shown in FIG. 17) while the connecting pieces 50 of the plurality of segments are sequentially removed, and the connection is made. The pieces 50 are sequentially returned and attached to the state shown in FIG.

In the state shown in FIG. 18, that is, in a state in which the primary waterproof rubber 40a is mounted and all the connecting pieces 50 are mounted back, the connecting pieces 50 transmit the reaction force of the propulsive force of the shield machine 100. So that the shield jack 103
, The propulsive force of the shield machine 100 is obtained, and the tunnel is excavated in a usual manner (see FIG. 19) while assembling the usual segments S, S, S... Then, when the excavation proceeds further and the influence of the propulsion force on the flexible segment portion disappears, all the connecting pieces 50 are removed, and the secondary waterproof rubber 40b and the load-bearing rod 51 are attached. Of the flexible segment is completed.

Since the load-bearing rods 51 are used to resist external earth pressure, a large number of the load-bearing rods 51 are arranged side by side at relatively narrow intervals on the same circumference. The load-bearing rod 51 is composed of flange sections 53, 53 provided at both ends thereof and a sleeve 52 inserted therein, so that both steel frame segment bodies 20 are provided.
A and 20A also function as a displacement restricting device (displacement stopper) when the displacement amount reaches the limit.

[0007] The above-mentioned conventional flexible segment has many construction results and high reliability. However, as described above, there is a problem that the assembling work is very complicated and requires much trouble. doing.

In addition, the conventional flexible segment cannot sufficiently receive the external soil pressure until the load bearing bar 51 is attached, and thus has a problem that it is not suitable for backing material construction. In addition, if backing material construction is not possible or if backing construction is incomplete, the probability of water leakage may increase, and it is said that in this conventional method, it is necessary to apply water-stopping particularly carefully.

[0009]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and can be carried out in a construction procedure (including backing material injection construction) that is almost the same as a normal segment. No special process and time is required,
Moreover, it is another object of the present invention to provide a flexible segment that can be displaced by following the lining of a constructed tunnel without being damaged by a large displacement of the ground.

[0010]

In order to achieve the above object, the present invention is characterized in that a steel segment body 20a, 20b is juxtaposed on both sides of a rubber piece 10 formed in a segment shape, and the steel segments 20a, 20b are arranged side by side. Rubber piece 1 on body 20a, 20b
0, the two steel segment bodies 20a, 20b are connected to a plurality of connecting rods 30, 3 for loosely inserting the inside of the rubber piece 10 and the inner main beams 21b, 21b of the both steel segment bodies 20a, 20b.
0, 30 ..., both steel segment bodies 20a, 20b
However, there is a technical measure in which the rubber pieces 10 are connected so as to detachably retain the temporarily compressed state.

Therefore, both steel frame segment bodies 20
a and 20b are connected and integrated by connecting rods 30, 30, 30..., and the rubber piece 10 is also temporarily compressed and clamped by both steel frame segment bodies 20a and 20b from both sides. , 30, 30,... Are loosely inserted, the two steel frame segment bodies 20a, 20b and the rubber piece 10 exhibit an operation that can be handled as an integral part in normal handling such as transportation.

[0012] The flexible segment of the present invention can be used in a conventional segment S, S, S.
・ ・ Connect to the ring and assemble it as a segment ring. Once one or a few rings (usually only one ring) of the flexible segment of the present invention have been assembled, then the normal segments can be assembled again to continue tunnel excavation.

In the conventional example shown in FIG. 16 and the following, since the flexibility is obtained by the rubber sheets of the primary waterproof rubber 40a and the secondary waterproof rubber 40b, a ring composed of flexible segments is assembled. In the later tunnel excavation, the connecting piece 50 was specially used to obtain the propulsive force of the shield excavator 100. However, in the present invention, since the rubber piece 10 is used, the reaction force of the propulsive force of the shield excavator 100 is used. Can be received by the rubber piece 10 (the rubber piece 10 may be further compressed and deformed, but has sufficient drag).

After the tunnel excavation has been continued for a predetermined distance, the steel segments 20a and 20b are
Is temporarily detached (eg, the nut 31 in FIG. 3 is loosened) so that the rubber pieces 10, 10, 10... Since the ring is interposed, the two steel segment bodies 20a, 2
Ob is an allowable deformation range of the rubber piece 10 and has an effect of enabling displacement in both the compression direction and the swelling direction.

.. Are connected to the inner main beams 21b, 2b of the two steel segment bodies 20a, 20b.
1b, the connecting rod 30 and the inner main girder 2
The amount corresponding to the play (clearance) with 1b, 21b,
In addition to the above-mentioned expansion and contraction displacement, the present invention has an effect of coping with angular displacement and torsion displacement.

Further, the rubber piece 10 itself has a large resistance, but also has the reinforcement of the connecting rods 30, 30, 30,..., And can sufficiently exhibit its function as an external soil pressure receiver. Even if the injection is performed, an effect of sufficiently resisting a large injection pressure of the backing material is exhibited.

Next, a second aspect of the present invention is to provide a steel segment body 2 on both sides of a rubber piece 10 formed in a segment shape.
0a and 20b are juxtaposed to form the two steel segment bodies 20.
a, 20b, the rubber piece 10 is sandwiched between the two steel segment bodies 2
0a and 20b are the inside of the rubber piece 10 and the two steel segment bodies 20.
a, 20b and a plurality of screw rods 30a, 30a. 30a... And each of the screw rods 30a is screwed to one or both of the inner main girders 21b, 21b of the both steel segment bodies 20a, 20b. A technical means is adopted in which the rubber pieces 10 are connected with nuts 31, 31, 31...

Therefore, both steel segments 20a, 20
b are screw rods 30a, 30a. .. Are connected by nuts 31, 31, 31... For temporarily compressing the rubber pieces 10 with both steel segment bodies 20a, 20b, so that the nuts 31, 31, 31,. By attaching, the steel segment bodies 20a and 20b exhibit an action of maintaining a state in which the rubber pieces 10 are temporarily compressed.

The nuts 31, 31, 31,...
By loosening the rubber pieces 10, the two steel segment bodies 20a and 20b detach and attach the state in which the rubber pieces 10 are temporarily compressed, and exhibit the function of exhibiting sufficient flexibility by the elasticity of the rubber pieces 10.

Next, a third aspect of the present invention is to provide a steel segment body 2 on both sides of a rubber piece 10 formed in a segment shape.
0a and 20b are juxtaposed to form the two steel segment bodies 20.
a, 20b, the rubber piece 10 is sandwiched between the two steel segment bodies 2
0a and 20b are the inside of the rubber piece 10 and the two steel segment bodies 20.
a, 20b and a plurality of connecting rods 30, 30, 30,...
0 to the inner main girder 21 of the steel segment bodies 20a and 20b.
b and 21b, which are engaged on the outside of one or both of them, and are connected with a locking member 32 such as a pin for detachably holding a state in which the rubber piece 10 is temporarily compressed by the two steel segment bodies 20a and 20b. Technical measures.

Therefore, both steel segment bodies 20a, 20
b is the inside of the rubber piece 10 and both steel segment bodies 20a, 20b
And a plurality of connecting rods 30, 30, 30,... For loosely inserting the inner main girders 21b, 21b of the steel main body 21b, 21b of the steel segment bodies 20a, 20b. Since the rubber pieces 10 are temporarily compressed by the steel segment bodies 20a and 20b engaged with one or both of the outer sides, the rubber pieces 10 are connected to the retaining members 32 such as pins for detachably holding the rubber pieces 10. The rubber pieces 1 are made of the segment bodies 20a and 20b made of
0 are temporarily compressed, and the locking members 32, 32,
By attaching 32..., The function of maintaining the compressed state of the rubber piece 10 is exhibited.

Further, locking members 32, 32, 3 such as the above-mentioned pins, etc.
By extracting 2 ..., both steel segment bodies 20
a and 20b exhibit an action of detaching the state where the rubber piece 10 is temporarily compressed.

Next, a fourth aspect of the present invention is to provide a steel segment body 2 on both sides of a rubber piece 10 formed in a segment shape.
0a and 20b are juxtaposed to form the steel segment body 20.
a, 20b, the rubber piece 10 is sandwiched between the two steel segment bodies 2
0a and 20b are the inside of the rubber piece 10 and the two steel segment bodies 20.
a, 20b and a plurality of connecting rods 30, 30, 30,...
0 to the inner main girder 21 of the steel segment bodies 20a and 20b.
b and 21b, which are engaged on the outside of one or both of them, and are connected with a locking member 32 such as a pin for detachably holding a state in which the rubber piece 10 is temporarily compressed by the two steel segment bodies 20a and 20b. Each of the connecting rods 30 is provided with both steel segment bodies 2.
This is a technical measure in which flange-shaped stoppers 33, 33 are provided to prevent the interval between 0a, 20b from expanding beyond a predetermined value.

Therefore, in addition to the above-described "claim 3,"
In the present invention, since the flange-shaped stoppers 33, 33 are provided, the rubber pieces 10 of the two steel segment bodies 20a, 20b are provided.
Has the effect of restricting the amount of displacement in the direction in which bulges. If the distance between the two steel segment bodies 20a and 20b is increased beyond the amount by which the rubber piece 10 swells due to its elasticity, the waterproofness is impaired.
Reference numeral 33 denotes both steel segment bodies 20a, 20
It works to prevent the distance of 0b from being widened.

Next, according to the invention of claim 5, a steel segment 2 is provided on both sides of a rubber piece 10 formed in a segment shape.
0a and 20b are juxtaposed to form the steel segment body 20.
a, 20b, the rubber piece 10 is sandwiched between the two steel segment bodies 2
0a and 20b are the inside of the rubber piece 10 and the two steel segment bodies 20.
a, 20b can be detached by a plurality of connecting rods 30, 30, 30,... loosely inserting the rubber pieces 10 with the two steel connecting rods 30, 30, 30. And both steel segment bodies 20a,
In this case, a technical means is adopted in which the distance relation of the distance 20b is removably fixed.

Therefore, the present invention provides a dual steel segment body 20.
a, 20b are connected so as to be detachably fixed, so that the reaction force of the propulsive force of the shield machine can be received by the connecting rods 30, 30, 30,. By fixing the distance relationship between the segment bodies 20a and 20b and detaching the state in which the rubber pieces 10 are temporarily compressed by the two steel segment bodies 20a and 20b, the two steel segment bodies 20a and 2b are removed.
The reference numeral 0b indicates an effect that the rubber piece 10 can be displaced within the allowable deformation range.

Next, according to the invention of claim 6, a steel segment 2 is provided on both sides of a rubber piece 10 formed in a segment shape.
0a and 20b are juxtaposed to form the steel segment body 20.
a, 20b, the rubber piece 10 is sandwiched between the two steel segment bodies 2
0a and 20b are the inside of the rubber piece 10 and the two steel segment bodies 20.
a, 20b and a plurality of screw rods 30a, 30a. 30a... And the respective screw rods 30a are screwed together on both outer sides of the inner main beams 21b and 21b of the steel segment bodies 20a and 20b, and the rubber pieces 10 are temporarily compressed by the both steel segment bodies 20a and 20b. Both ends of each screw rod 30a are connected to outer main girders 22a, 2 of steel segment bodies 20a, 20b.
Technical measures taken detachably fixed to 2b are taken.

Therefore, the steel segments 20a, 20b have the function of detachably retaining the state in which the rubber pieces 10 are temporarily compressed at the screwed positions of the nuts 31, 31. By attaching to and detaching from the outer main girders 22a and 22b of the segment bodies 20a and 20b, the distance relationship between the two steel segment bodies 20a and 20b is fixed detachably.

Next, the invention of claim 7 relates to a steel segment 2 on both sides of a rubber piece 10 formed in a segment shape.
0a and 20b are juxtaposed to form the steel segment body 20.
a and 20b sandwich the rubber piece 10 and project inwardly at two or more locations on the outer main girder 21a of the one steel frame segment body 20a to project inwardly. Main girder 21 of steel frame segment body 20b
a at the position opposed to the screw cylinders 22a, 22a, 22a,.
22b, 22b,... Are protruded, and between the opposed screw cylinders 22a, 22b, both steel frame segment bodies 20a,
Both ends of a screw rod 30a for loosely inserting the inner main girders 21b, 21b of 20b and the rubber piece 10 are screwed together, and the screw rod 30a and the screw cylinders 22a, 22b are connected to the steel frame segment body 20.
When the screw bar 30a is screwed into one of the screw tubes 22a and 22b in a state where the rubber piece 10 is appropriately compressed by the screw members 20a and 20b, both ends are screwed into the two screw tubes 22a and 22b and screwed into the other side. Then, the one end side is provided with a technical means that is dimensioned so that the screw engagement with one of the screw cylinders 22a and 22b is released.

The flexible segment of the present invention is prepared in the state shown in FIG. 7 or FIG. That is, the two steel frame segment bodies 20a and 20b are formed by the rubber pieces 1 sandwiched therebetween.
.. Are prepared in a state where the both ends of the connecting rods 30, 30, 30,... Are screwed and connected to the opposing screw cylinders 22a, 22b.

Therefore, both steel frame segment bodies 20
are connected and integrated by connecting rods 30, 30, 30..., and the rubber piece 10 is also compressed and sandwiched by both steel frame segment bodies 20a, 20b from both sides. Are loosely inserted, the two steel frame segment bodies 20a, 20b and the rubber piece 10
In the case of handling such as ordinary transportation, it has an action that can be handled as an integral object.

Then, the flexible segment of the present invention is connected to a normal segment ring of a tunnel to be excavated in a usual manner, and similarly assembled as a segment ring. Once the flexible segment ring of the present invention has been assembled, then the normal segment is again assembled and the tunnel is drilled and continued.

After the flexible segment ring of the present invention is assembled, the reaction force of the propulsive force of the shield machine is received by the existing segment rings via the connecting rods 30, 30, 30,... Present.

When the tunnel excavation progresses and the propulsive force of the shield machine does not affect the already assembled flexible segment ring portion of the present invention, the connecting rods 30, 3 are connected.
., Are screwed in a direction in which they are disengaged from one of the screw cylinders 22a, 22b, and as shown in FIG. 11, both steel frame segments by connecting rods 30, 30, 30,. Disconnect body 20a, 20b.

Then, as described above, the ring of the rubber piece 10 is interposed in the middle of the tunnel lining, and the tunnel lining can be displaced at this portion within the allowable deformation range of the rubber piece 10. It has the following effect.

Next, according to the invention of claim 8, a steel segment body 2 is provided on both sides of a rubber piece 10 formed in a segment shape.
0a and 20b are juxtaposed to form the steel segment body 20.
a, 20b, the rubber piece 10 is sandwiched between the two steel segment bodies 2
0a and 20b are the inside of the rubber piece 10 and the two steel segment bodies 20.
a, 20b and a plurality of screw rods 30a, 30a. 30a... And each of the screw rods 30a is screwed to the outside of both of the inner main girders 21b and 21b of the both steel segment bodies 20a and 20b, and the rubber pieces 10 are joined by the both steel segment bodies 20a and 20b. .. Are connected to the outer main girder 21a of the steel frame segment body 20a via detachable connecting pieces 34. Technical measures.

Therefore, according to the present invention, when the nuts 31, 31, 31... For temporarily compressing the rubber piece 10 are loosened and the connecting piece 34 is removed, the screw rods 30a, 30a. .. Are free and the two steel segment bodies 20a and 20b can be displaced within the allowable deformation range of the rubber piece 10.

[0038]

Next, embodiments of the present invention will be described with reference to the accompanying drawings. In the figure, reference numeral 10 denotes a rubber piece configured in a segment shape. This rubber piece 10 has recently been
Even if used as synthetic rubber for a long time, there is almost no fatigue,
In addition, those that have not been chemically or physically deteriorated even after a long period of time have been developed and are widely used in construction and construction. In the present invention, these conventionally known rubber materials may be used.

The rubber piece 10 is formed in a segment shape. In order to configure a segment shape, a ring having a predetermined width may be divided into a plurality of shapes. Needless to say, the dividing method may be substantially the same as a conventional tunnel lining segment. Type B, K
What is necessary is just to make it a segment shape corresponding to each shape, such as a type | mold.

That is, the segment shape is defined as a predetermined segment thickness (dimension of a portion corresponding to L3 in FIG. 1).
And the segment width (the width dimension in the L2 direction in FIG. 2)
Is small, and a chord length (dimension of a portion corresponding to L1 in FIG. 1) is long, so that a rubber material may be integrally formed into such an arc shape in a solid state. However, although a solid integrated product is used, it may be divided and formed into a segment shape by combining a plurality of pieces, or may be formed in a hollow shape like an air cushion.

When the rubber piece 10 is composed of a plurality of pieces, the direction of the chord length L1 may be divided into a plurality of pieces. In this case, the connection supporting the pieces of each rubber piece 10 receives the earth pressure. Rods 30, 30, 30,... (Screw rods 30a, 3
0a, 30a...) Must be prepared in large numbers, which is disadvantageous in many cases.
Therefore, when a plurality of rubber pieces 10 are stacked in the tunnel axis direction, the solid molded article and the properties thereof are almost unchanged, and the one in which a steel plate and a rubber plate are laminated is generally called a laminated rubber. A large reliability has been obtained as a material against a large load, and this kind of laminated rubber may be used.

In the case where the rubber piece 10 is formed in a hollow shape, although not shown, a structure conventionally known as an air cushion may be used, and the hollow portion is completely shut off from the outside air. (Connecting connecting rod 3
0 or a screw rod 30a is inserted into the hollow portion so as not to impair the hermeticity of the hollow portion. Of course).

Then, steel frame segment bodies 20a and 20b are juxtaposed on both sides of the rubber piece 10, and the rubber piece 10 is sandwiched between the steel frame segment bodies 20a and 20b. The steel frame segment bodies 20a and 20b are provided with a pair of main girders 21.
b, 21b, a pair of joint plates 25, 25, and a skin plate 24, and if necessary, reinforcing ribs 23a, 23b are provided at appropriate places. These structures are different from those of a conventional steel segment. It does not change.

The steel frame segment 20a,
20b is one main girder 21b, in the present invention, an outer main girder 21a on the side opposite to the inner main girder 21b on the side in contact with the rubber piece 10, and ring joint holes 25a, 2b.
5a, 25a, etc., and the joint plate 25 is provided with a segment joint hole 25b in the same manner as in the prior art. A plurality of steel frame segment bodies 20a and 20b are provided with segment joints such as bolts in the segment joint holes 25b.
So that the ring joint hole 25
a, 25a, 25a... are provided with similar ring joints to connect the ring of the flexible segment of the present invention to a normal segment ring.

In the illustrated example, the steel frame segment bodies 20a and 20b have a segment width L2a smaller than that of a normal one (less than half), but this is due to the size of the flexible segment of the present invention. And to make the weight approximately equal to that of a normal segment.
Since there is no need to limit the dimension of a, the segment width may be the same as that of a normal segment.

Then, both steel segment bodies 20a, 20
b is the inside of the rubber piece 10 and both steel segment bodies 20a, 20b
Are connected by a plurality of connecting rods 30, 30, 30,...
a and 20b are connected so as to detachably retain the state in which the rubber piece 10 is temporarily compressed.

In the present application, "temporarily compressing the rubber piece 10" means that the rubber piece 10 is compressed in advance in an appropriate range (to the extent that it can be further compressed). The term "maintain" means that the compressed material cannot return to the state before temporary compression by its elasticity unless a special desorption process is performed.

The flexible segment of the present invention is assembled in a ring shape using the conventional method in the tail portion of the shield machine while the rubber piece 10 is temporarily compressed. Then, once the flexible segment ring according to the present invention has been assembled, tunnel digging is continued using normal segments. As shown in FIG. 4, the provisionally compressed state of the rubber piece 10 is detached and attached at an appropriate time.
And the flexibility of the rubber piece 10 is obtained.

Claim 2 is one of specific examples in which the two steel segment bodies 20a and 20b are detachably connected so as to detachably retain the state in which the rubber pieces 10 are temporarily compressed, and are configured in a segment shape. The steel segment bodies 20a and 20b are juxtaposed on both sides of the rubber piece 10,
The rubber pieces 10 are sandwiched between the rubber pieces 10a and 20b.
0a, 20b and a plurality of screw rods 30a, 30a. 30a... And each of the screw rods 30a is screwed to one or both of the inner main girders 21b, 21b of both steel segment bodies 20a, 20b. The rubber pieces 10 are connected with nuts 31, 31, 31,... For temporarily compressing the rubber pieces.

That is, the temporarily compressed state is changed to the screw rod 30.
a, 30a. 30a and nuts 31, 31, 31
..The nut 3
By temporarily tightening the nuts 31, 31, 31, the nuts 31, 3 are temporarily compressed as shown in FIG.
.. May be used only to hold the state. ), The nuts 31, 31, 31,...
As shown in FIG. 4, the state in which the rubber pieces 10 are temporarily compressed by the both steel segment bodies 20 a and 20 b is released, that is, the rubber pieces 10 can be detached.

In the above, the nut 31 is connected to the inner main girders 21b, 21b of the two steel segment bodies 20a, 20b.
The reason why one of or both of them is screwed together is that one is screwed into the screw rod 3 as shown in FIG. 3 and FIG.
If there is a screw head (flange-shaped stopper 34) at 0a, this may be used. If there is no screw head at the screw rod 30a, the pair of nuts 31,
The inner main beams 21b, 21b of Oa, 20b are screwed to the outside of both.

In the present invention, as shown in FIG. 4, the rubber piece 10 is temporarily compressed, and the two steel segment members 20a and 20b follow the displacement without removing the temporarily compressed state. Can be displaced. That is, if about 30% of the compressible range of the rubber piece 10 is temporarily compressed, the two steel segment bodies 20a and 20b can be displaced in the remaining 70% of the compression range. However, in this method, the elasticity of the rubber piece 10 cannot be fully utilized, and therefore, in the present invention, the state in which the rubber piece 10 is temporarily compressed is detached and used.

The screw rod 30a is connected to the inside of the rubber piece 10 and the inner main girder 21b of the both steel segment bodies 20a, 20b.
21b (the rubber piece 10 may be inserted without any clearance without any particular clearance). There is no particular problem when the distance between the two steel segment bodies 20a and 20b changes in a parallel state, but there is also an angular displacement and a torsional displacement in the displacement of the tunnel. Therefore, in order to cope with these, the rubber piece 10 itself can be locally compressed or twisted.
Are loosely inserted so as not to hinder the angular displacement and the torsional displacement. In particular, the screw rod 30a is inserted into a through hole (not shown) formed in the inner main girders 21b, 21b with an appropriate margin. It is done.

The screw head (flange-shaped stopper 34) of the screw rod 30a and the nut 31 have a function as a stopper, and the distance between the two steel segment bodies 20a, 20b is independent of the expandable range of the rubber piece 10. It can be used to prevent unlimited spread. In other words, when the steel segment members 20a and 20b shown in FIG. 4 are to be expanded right and left without any restriction, the rubber pieces 10 in the compressed state may be elastic and may not be able to seal the gap therebetween. Therefore, the screw head (flange-shaped stopper 34) of the screw rod 30a and the nut 31 (not shown)
May be a pair of nuts 31 screwed into the nut. ) Prevents the distance between the two steel segment bodies 20a and 20b from exceeding a predetermined value.

Claim 3 is still another specific example in which steel segment members 20a and 20b are juxtaposed on both sides of a rubber piece 10 formed in a segment shape, and the steel segment members 20a and 20b are used for the two. With the rubber piece 10 interposed, the two steel segment bodies 20a, 20b are connected to a plurality of connecting rods 30, 30, 30 for loosely inserting the inside of the rubber piece 10 and the inner main beams 21b, 21b of the both steel segment bodies 20a, 20b. .. And each of the connecting rods 30 is engaged with one or both of the inner main girders 21b and 21b of the steel segment bodies 20a and 20b to engage the rubber pieces 10 with both steel segment bodies 20a and 20b.
Are temporarily connected to a locking member 32 such as a pin for detachably holding a state of the compressed state.

In the example shown in FIGS. 5 and 6, a taper pin is used as the locking member 32 such as the pin, and this taper pin is inserted through the connecting rod 30. A conventionally known split pin may be used. Further, although not shown, a groove is provided on an appropriate peripheral surface of the connecting rod 30 to form a C pin.
A retaining ring of a letter shape, an E shape, or the like may be fitted. Further, although not shown in the figure, a detachable flange-shaped retaining ring split into two pieces may be used.

A fourth aspect of the present invention relates to a steel segment body 20a,
20b, the steel segments 20a, 20
b, the rubber piece 10 is sandwiched between the two steel segment bodies 20a, 2a.
0b is the inside of the rubber piece 10 and both steel segment bodies 20a, 20b.
, and a plurality of connecting rods 30, 30, 30,... for loosely inserting the inner main girders 21b, 21b of the inner segment 20b into the inner main girders 21b, 21b of the steel segment bodies 20a, 20b.
The rubber pieces 10 are engaged with the outside of either one or both of them, and the rubber pieces 10 are temporarily compressed by the both steel segment bodies 20a and 20b. Are both steel segment bodies 20a, 20b
Are provided with flange-shaped stoppers 33, 33 for preventing the interval between the two from expanding more than a predetermined amount.

That is, when the screw rod 30a of claim 2 is used, the screw head or the nut 31 is used as described above.
Serves as a stopper for the displacement of the two steel segment bodies 20a and 20b. However, since the connecting rod 30 is not particularly provided with this stopper, the connecting rod 30 is provided with flange-shaped stoppers 33 and 33. For convenience of manufacture, the flange-shaped stoppers 33, 33 may be manufactured separately from the connecting rod 30 and screwed together, or may be fixed later by welding or the like.

Next, according to the invention of claim 5, a steel segment 2 is provided on both sides of a rubber piece 10 formed in a segment shape.
0a and 20b are juxtaposed to form the steel segment body 20.
a, 20b, the rubber piece 10 is sandwiched between the two steel segment bodies 2
0a and 20b are the inside of the rubber piece 10 and the two steel segment bodies 20.
a, 20b can be detached by a plurality of connecting rods 30, 30, 30,... loosely inserting the rubber pieces 10 with the two steel connecting rods 30, 30, 30. And both steel segment bodies 20a,
20b are connected so as to be detachably fixed.

The steel segments 20a, 20b are juxtaposed on both sides of the rubber piece 10 formed into a segment shape, and the rubber piece 10 is sandwiched between the steel segments 20a, 20b.
The two steel segment bodies 20a, 20b are connected to the inside of the rubber piece 10 and the inner main girders 21b, 2 of the both steel segment bodies 20a, 20b.
1b and a plurality of connecting rods 30, 30, 30,.
The two steel segment bodies 20a and 20b are
Is temporarily detachably held in the same manner as in claims 1 to 4.

Further, the present invention relates to a segment body 20 made of both steels.
The distance relationship between a and 20b is detachably fixed. To fix this detachably, the two steel segment bodies 20 are fixed.
The distances a and 20b are fixed so that they cannot be changed, and can be released when necessary.
Then, after removing the one in which the distance between the two steel segment bodies 20a and 20b is fixed so as not to be changed, the two steel segment bodies 20a and 20b can be moved within a predetermined range both in a direction away from and close to each other. Of course it is.

According to the invention of claim 6, the steel segment members 20a and 20b are juxtaposed on both sides of the rubber piece 10 formed in a segment shape, and the steel segment members 20a and 20b are arranged side by side.
a, 20b, the rubber piece 10 is sandwiched between the two steel segment bodies 2
0a and 20b are the inside of the rubber piece 10 and the two steel segment bodies 20.
a, 20b and a plurality of screw rods 30a, 30a. 30a... And the respective screw rods 30a are screwed together on both outer sides of the inner main beams 21b and 21b of the steel segment bodies 20a and 20b, and the rubber pieces 10 are temporarily compressed by the both steel segment bodies 20a and 20b. Both ends of each screw rod 30a are connected to outer main girders 22a, 2 of steel segment bodies 20a, 20b.
2b.

That is, the steel segments 20a, 20b are juxtaposed on both sides of the rubber piece 10 formed in a segment shape, and the steel segments 20a, 20b are used to separate the rubber pieces 1 from each other.
0, the two steel segment bodies 20a, 20b are provided with a plurality of screw rods 30a, 3 for loosely inserting the inside of the rubber piece 10 and the inner main beams 21b, 21b of the both steel segment bodies 20a, 20b.
0a. 30a... Are screwed to the respective screw rods 30a on both outer sides of the inner main girders 21b, 21b of the steel segment bodies 20a, 20b.
The connection of the rubber pieces 10 with the nuts 31 for temporarily compressing the rubber pieces 10 is the same as in claim 2.

The two ends of the screw rod 30a are connected to the outer main girders 22a, 22a of the two steel segment bodies 20a, 20b.
The screw bar 30a is simply detachably connected to the outer main girders 22a, 22a.
That is, the length of the screw rod 30a is longer than that shown in the state of FIG.
If the outer main girders 22a, 22a have the same inner dimensions as the outer main girders 22a, the two steel segment bodies 20a, 20b will be displaced closer to each other even if both ends are removed from the outer main girders 22a, 22a. The screw rod 30a acts as a stopper and cannot be displaced.

Therefore, the length of the screw rod 30a is
The outer main girder 22a, 22b of the two steel segment bodies 20a, 20b in the state used for tunnel lining (the state after the final construction)
It is necessary to set shorter than the distance of 22b (the difference of this dimension secures a range where the rubber piece 10 can be compressed after the application).
Needless to say, it is necessary to appropriately interpose a connecting body in order to detachably connect between the a and 22a.

Next, according to the invention of claim 7, a steel segment body 20 is provided on both sides of the rubber piece 10 formed in a segment shape.
a, 20b are juxtaposed to form the steel segment body 20a,
The rubber pieces 10 are sandwiched by 20b, and screw cylinders 22a, 22a, 22a,... Protruding inward at a plurality of locations of the outer main girder 21a of the one steel frame segment body 20a are protrudingly provided. Outer main girder 21a of frame segment body 20b
The screw cylinders 22b, 2 protruding inward also at positions facing the screw cylinders 22a, 22a, 22a,.
2b, 22b,.
2a, 22b, between both steel frame segment body 20a, 2b
The two ends of a screw rod 30a for loosely inserting the inner main girders 21b, 21b of Ob and the rubber piece 10 are screwed together, and the screw rod 30a and the screw cylinders 22a, 22b are connected to the steel frame segment bodies 20a,
In a state where the rubber piece 10 is appropriately compressed at 20b, the screw rod 3
When the screw 0a is screwed to one side of the screw cylinders 22a and 22b, both ends thereof are screwed to the two screw cylinders 22a and 22b, and when screwed to the other side, one end is screwed to one of the screw cylinders 22a and 22b. It is a dimension that comes off.

That is, the screw cylinders 22a and 22b are used as connecting tools for the short screw rods 30. The screw cylinders 22a and 22b may be formed integrally with the outer main girder 21a. It is a matter of course that the screw cylinders 22a and 22b may be manufactured and fixed by welding or the like.

Then, each of the opposing screw cylinders 22a, 22
Both ends of a screw rod 30a for loosely inserting the inner main girders 21b, 21b of both steel frame segment bodies 20a, 20b and the rubber piece 10 are screwed between 2b.

That is, the screw rod 30a has a screw head 30a1 for attaching a fastener in the middle and a screw foot 3 at both ends.
0a2, 30a3 are provided, and both end screw foot portions 30a2, 30a are provided.
a3 can be screwed into the screw cylinders 22a and 22b, respectively.

In order for the screw rod 30a to loosely insert the inner main girders 21b, 21b of both steel frame segment bodies 20a, 20b and the rubber piece 10, the inner main girders 21b and the rubber piece 1 are used.
It is a matter of course that a through hole is previously formed at 0.

The inner main girders 21b, 21b and the rubber piece 1
The reason why the diameter of the above-mentioned through-hole is determined by inserting the screw rod 3
When the two steel frame segment bodies 20a and 20b are displaced, the inner main girders 21b and 21b (in particular, the through holes 10a of the rubber pieces 10 are connected to the connecting rods 30a). Alternatively, the diameter may be large enough that it is not inconvenient to insert the screw rod 30a.) As described above, the squeezing may hinder the displacement of the steel frame segment bodies 20a and 20b. It is.

Then, the screw rods 30a, 30a, 30
and the screw cylinders 22a and 22b are connected to the screw rods 30a, 30a, 30a... in a state where the rubber pieces 10 are appropriately compressed by the steel frame segment bodies 20a and 20b.
When screwed to one side of 2a, 22b, both ends are screwed into both screw tubes 22a, 22b, and when screwed to the other side, one end is unscrewed from either screw tube 22a, 22b. There is something.

In the example shown in FIG. 7, one screw cylinder 22a has a low height H1, and the other screw cylinder 22b has a height H2.
And the outer main girders 21a, 21 in a state where the rubber pieces 10 are appropriately compressed by the steel frame segment bodies 20a, 20b.
When the distance between a is L10, the length L1 of the connecting rod 30
1 is set so as to satisfy the following condition.

[0074]

(Equation 1)

[0075] Then, in order to manufacture the one in which both ends of the connecting rod 30 are screwed into the screw cylinders 22a and 22b in a state in which the rubber pieces 10 are appropriately temporarily compressed by the two steel frame segment bodies 20a and 20b, first, as shown in FIG. As shown by the solid line, in a state where the outer main girder 21a of one steel frame segment body 20a is not attached, the screw rod 30a is inserted from the one steel frame segment body 20a and the tip is made of the other steel frame segment body 20a. The screw is screwed to the innermost part of the screw cylinder 22b of the frame segment body 20b.

Then, the outer main girder 21a of one of the steel frame segment bodies 20a is fixed to the broken line portion in FIG. 8 while securing the state where the rubber piece 10 is appropriately compressed. Then, the screw 30a is advanced to the left side in FIG. 8 while the rubber piece 10 is properly compressed, so that the one-end screw foot 30a2 is connected to the screw cylinder 22a and the other end screw foot 30a3 is connected. The screw shown in FIG. 7 can be manufactured by screwing onto the screw cylinder 22b.

The two steel frame segment bodies 20a, 20a
b, one end of both steel frame segment bodies 20a,
The cover body 40 is fixed to one of the steel frame segments 20b, and has the other end extending to the other outer peripheral surface of the steel frame segment members 20a and 20b.

The above-mentioned cover body 40 is made up of “FIG. 1” to “FIG.
1) It can be used in all of the embodiments, and is formed of a thin steel plate and has one end fixed to one outer surface of both steel frame segment bodies 20a and 20b, and the other end formed as a free end or spot welded to such a degree that it can be easily removed. And the two steel frame segment bodies 20
When a and 20b are displaced, the contact surface is displaced or deformed to allow the displacement. In the embodiments shown in FIG. 13 to FIG. 15 described later, the cover body 40 has both ends fixed to the steel parts, but the cover body 40 itself may be deformed by a large force. I have.

The cover body 40 is only required to prevent the backing material from entering, and may be of such a degree as to withstand the backing material injection pressure. Further, in the illustrated example, a slight gap is provided between the inner surface side of the cover body 40 and the outer surface side of the rubber piece 10, but this gap may be omitted.

Reference numeral 27 in FIG. 2 indicates a back filling inlet. When this back filling inlet 27 is provided, it is a matter of course that the cover 40 does not block the back filling inlet. In addition,
Even in the case of performing back-filling, the back-filling inlet 27 may be a normal segment to be assembled next, and is not essential.

In the examples shown in FIGS. 9 to 11, the screw rod 30a is attached to both steel frame segment bodies 20a, 2a.
A pair of nuts 31, 31 for regulating the distance between the inner main girders 21b, 21b of 0b are screwed.

A pair of nuts 31 and 3 are attached to the screw rod 30a.
9 is screwed into the connecting rod 30 in advance, and the outer main girder 21a of the other steel frame segment body 20b is fixed, as shown in FIG. At this time, the screw cylinder 22b may be fixed to the outer main girder 21a.

The nuts 31, 31 are attached to the rubber piece 10 without the one outer main girder 21a shown in FIG.
Can be maintained by tightening the nuts 31, 31, which is convenient for the subsequent manufacture such as mounting of the outer main girder 21 a. After the assembly, the nuts 31, 31 are fixed to the inner main beams 21b, 21 by a predetermined distance as shown in FIG.
b, the two steel frame segment bodies 2
It functions as a stopper that limits the displacement range of 0a and 20b.

Next, a construction procedure using the flexible segment of the present invention will be described. "FIG. 11" shows the end stage of construction, where S and S are ordinary segments, C is secondary lining, and B is backing material. To assemble the flexible segment of the present invention in this state, the flexible segment shown in FIG. 9 (or the one shown in FIG. 7) may be combined with a normal segment S located on the left side of FIG. After that, the segment ring is assembled with the flexible segment of the present invention by connecting and continuing to the segment ring of the ordinary segment S.

As described above, the flexible segment of the present invention
The rubber piece 10 is temporarily compressed and screw rods 30a, 30a, 30a
Since the two steel frame segment bodies 20a and 20b are connected with each other, the both steel frame segment bodies 20a and 20b and the rubber piece 10 can be handled as an integral body.
It can be assembled into a segment ring by a conventional method.

After the segment ring is assembled with the flexible segment of the present invention, the tunnel is dug sequentially using the ordinary segment S again. In this case, the screw rods 30a, 30a, 30a... Are kept in a state in which the two steel frame segment bodies 20a, 20b are connected, and the reaction force of the propulsive force of the shield machine is reduced by the screw rods 30a, 30a.
a, 30a... are received in segments of a predetermined number of rings on the front side of the excavation (the left side in FIG. 11).

When the tunnel excavation proceeds and the influence of the propulsive force of the shield excavator does not affect the ring portion of the flexible segment of the present invention, the nuts 31 and 31 are loosened, and the connecting rod 30 is screwed in a predetermined direction. To break the connection between the two steel frame segment bodies 20a, 20b.

Then, the waterproof rubber 55 and the inner skin plate 54 are attached, and the secondary lining C is applied to obtain “FIG. 11”.
It can be in the state of.

Next, according to the invention of claim 8, a steel segment body 20 is provided on both sides of the rubber piece 10 formed in a segment shape.
a, 20b are juxtaposed to form the steel segment body 20a,
20b, the rubber piece 10 is sandwiched between the two steel segment bodies 20.
a and 20b are the inside of the rubber piece 10 and the segment body 20 made of both steels.
a, 20b and a plurality of screw rods 30a, 30a. 30a... And each of the screw rods 30a is screwed to the outside of both of the inner main girders 21b and 21b of the both steel segment bodies 20a and 20b, and the rubber pieces 10 are joined by the both steel segment bodies 20a and 20b. Are connected with the nuts 31, 31, 31,... To be temporarily compressed, and both ends or one end of each of the screw rods 30 a are connected to the outer main girder 21 of the steel frame segment bodies 20 a, 20 b via detachable connecting pieces 34.
b, 21b.

The steel segment bodies 20a, 20b of the embodiment shown in FIGS. 12 to 15 are provided with reinforcing ribs, and the inside of the segment is partitioned right and left by central longitudinal ribs 23a, 23a. Short ribs 23b, 23
b, 23b... are provided alternately and partitioned into small rooms. Each room outside the central longitudinal ribs 23a, 23a is filled with concrete. Reference numeral 26 denotes a concrete notch which is used as an empty space for mounting a joint.

In the present invention, instead of the screw cylinders 22a and 22b and the screw rod 30a according to claim 7, the screw rod 30a is replaced with the screw rod 30a.
a and a detachable connecting piece 34, as shown in FIG.
2 "to 14", the connecting piece 34 and the screw cylinder 22c are screwed to the outer main girders 21b, 21b (in the illustrated example, the central longitudinal ribs 23a, 23a). The connection piece 34 and the screw cylinder 22c are removed when the influence of the propulsion of the machine is removed.

In the examples shown in FIGS. 12 to 14,
The other end of the screw rod 30a is inserted into the fixing cylinder 22d and is fixed by the fixing screw 22e. However, the other end of the screw rod 30a may be fixed to the outer main girder 21b so as not to be detachable, or Similarly, the connecting piece 34 and the screw cylinder 22c may be interposed.

In the embodiment shown in FIG. 15, the connecting piece 34 is replaced by a two-piece connecting body 34a, and the screw rod 30a
A locking groove 30e is provided at the end of the steel frame segment body 20.
A pillar 35 having a locking groove 35e is provided on the a, 20b side,
The two-piece split connecting body 34a is provided with convex ridges 34b, 34b which are engaged with the locking grooves 30e, 35e at both ends, and is attached so as to hold the screw rod 30a and the column 35, and the fixing screw 36 is provided.
It is made to connect with.

In the figure, reference numeral 11 denotes a plate embedded in the rubber piece 10, and the connecting rod 1
, 2, 12,.
Are connected to the inner main girder 21b, and the rubber piece 1
0 and the two steel frame segment bodies 20a, 20b. Reference numeral 21c denotes an inner contact plate which is a waterproof rubber 5.
5 constitute the mounting portion.

[0095]

As described above, according to the present invention, since the rubber piece 10 is sandwiched between the steel frame segment members 20a and 20b, the flexible segment is provided in the deformable range of the rubber piece 10. A ring can be constructed and each flexible segment can provide a flexible segment that can be treated as a unitary piece like a normal segment.

The present invention also relates to a rubber piece 10 and a connecting rod 3.
0, 30, 30,... Or screw rods 30a, 30a, 3
0a... Receive the soil pressure with a large drag, so that even if the backing work is performed at a high pressure, the two steel frame segment bodies 20
It is possible to prevent the backing material from entering too much between the a and 20b, and to perform a reliable backing work. In addition, the flexibility of the rubber piece 10 even when a large soil pressure or the like is locally applied to the rubber piece 10 site. Can provide a flexible segment that is not hindered.

In the inventions of claims 1 to 4, the reaction force of the propulsion force of the shield machine is transmitted to the rear through the rubber piece 10, but the rubber piece 10 has a normal propulsion force. And a flexible segment which can be constructed in the same manner as a normal segment.

Further, the invention as set forth in claim 5 or the following claims relates to connecting rods 30, 30, 30,... Or screw rods 30a, 30a,
By connecting the two steel segment bodies 20a and 20b at 30a ..., it is possible to provide a flexible segment capable of reliably transmitting the influence of the propulsive force of the shield machine to the existing segment side behind. It is.

The invention of claim 7 relates to the screw rod 30
The symbol “a” allows the connection of the two steel frame segment bodies 20a and 20b to be detached and attached only by the operation of screwing to one side, thereby providing a flexible segment with good operability.

Further, according to the invention of claim 8, the connection between the two steel frame segment bodies 20 a and 20 b can be detached by attaching and detaching the connection piece 34, and a flexible segment with good operability can be provided.

[Brief description of the drawings]

FIG. 1 is a front view of one embodiment of the flexible segment of the present invention.

FIG. 2 is a plan view.

FIG. 3 is a longitudinal sectional view.

FIG. 4 is a longitudinal sectional view after assembly.

FIG. 5 is a longitudinal sectional view of another embodiment.

6 is a longitudinal sectional view of the embodiment of FIG. 5 after assembly.

FIG. 7 is a longitudinal sectional view of still another embodiment.

FIG. 8 is an enlarged longitudinal sectional view in the middle of manufacturing.

FIG. 9 is an enlarged longitudinal sectional view of still another embodiment.

FIG. 10 is a longitudinally enlarged cross-sectional view of the embodiment of FIG. 9 in the process of manufacturing.

FIG. 11 is a longitudinal sectional view after completion of assembly in the embodiment of FIG. 9;

FIG. 12 is a partial plan view of still another embodiment.

FIG. 13 is a longitudinal sectional view of the embodiment of FIG. 12 in the middle of assembly.

FIG. 14 is a longitudinal sectional view of the embodiment of FIG. 12 after completion of assembly.

FIG. 15 is a longitudinal sectional view of still another embodiment.

FIG. 16 is a cross-sectional view showing a tunnel excavation step in a conventional flexible segment.

FIG. 17 is a sectional view showing a tunnel excavation step following “FIG. 16” in the conventional flexible segment.

FIG. 18 is a sectional view showing a tunnel excavation step following “FIG. 17” in the conventional flexible segment.

19 is a cross-sectional view showing a tunnel excavation step following “FIG. 18” in the conventional flexible segment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Rubber piece 20a Steel frame segment body 20b Steel frame segment body 21a Outer main girder 21b Inner main girder 22a Screw cylinder 22b Screw cylinder 30 Connecting rod 30a Screw rod 31 Nut 32 Locking tool 33 Flange stopper 34 Connecting piece

Claims (8)

[Claims] 1. A rubber piece (1) formed in a segment shape.
0), the steel segment bodies (20a, 20b) are juxtaposed, a rubber piece (10) is sandwiched between the steel segment bodies (20a, 20b), and the steel segment bodies (20a, 20b) are Rubber pieces (1
0) and a plurality of connecting rods (30, 30, 30,...) For loosely inserting the inside and the inner main girder (21b, 21b) of both steel segment bodies (20a, 20b). (20a, 20b) The flexible segment which connected so that the state which pre-compressed the rubber piece (10) was detachably held. 2. A rubber piece (1) formed in a segment shape.
0), the steel segment bodies (20a, 20b) are juxtaposed, a rubber piece (10) is sandwiched between the steel segment bodies (20a, 20b), and the steel segment bodies (20a, 20b) are Rubber pieces (1
0) and a plurality of screw rods (30a, 30a, 30a...) For loosely inserting the inside main girder (21b, 21b) of both steel segment bodies (20a, 20b), and the respective screw rods (30a, 30a, 30a...). 30a) is screwed on either or both of the inner main girders (21b, 21b) of the both steel segment bodies (20a, 20b) to form the two steel segment bodies (20a, 20b).
b) nuts (31, 3) for temporarily compressing the rubber pieces (10)
1, 31...). 3. A rubber piece (1) formed in a segment shape.
0), the steel segment bodies (20a, 20b) are juxtaposed, a rubber piece (10) is sandwiched between the steel segment bodies (20a, 20b), and the steel segment bodies (20a, 20b) are Rubber pieces (1
.0) and a plurality of connecting rods (30, 30, 30,...) For loosely inserting the inside and the inner main girders (21b, 21b) of both steel segment bodies (20a, 20b). 30)
The inner main girder (2) of the steel segment body (20a, 20b)
1b, 21b), a locking member such as a pin which engages on the outside of one or both of them and detachably holds the state in which the rubber piece (10) is temporarily compressed by the both steel segment bodies (20a, 20b). (32) A flexible segment connected with (32). 4. A rubber piece (1) formed in a segment shape.
0), steel segments (20a, 20b) are juxtaposed on both sides, and a rubber piece (10) is sandwiched between the steel segments (20a, 20b). Piece (1
.0) and a plurality of connecting rods (30, 30, 30,...) For loosely inserting the inside and the inner main girders (21b, 21b) of both steel segment bodies (20a, 20b). 30)
The inner main girder (2) of the steel segment body (20a, 20b)
1b, 21b), a locking member such as a pin which engages on the outside of one or both of them and detachably holds the state in which the rubber piece (10) is temporarily compressed by the both steel segment bodies (20a, 20b). (32), and each connecting rod (30) is connected to both steel segment bodies (20).
a, a flexible segment provided with flange-shaped stoppers (33, 33) for preventing the interval between (a, 20b) from expanding beyond a predetermined value. 5. A rubber piece (1) formed in a segment shape.
0), steel segments (20a, 20b) are juxtaposed on both sides, and a rubber piece (10) is sandwiched between the steel segments (20a, 20b). Piece (1
0) and a plurality of connecting rods (30, 30, 30,...) For loosely inserting the inside and the inner main girder (21b, 21b) of both steel segment bodies (20a, 20b). (20a, 20b) detachably retains a state in which the rubber piece (10) is temporarily compressed, and the two steel segment bodies (2
0a, 20b) are flexible segments connected so as to removably fix the distance relationship. 6. A rubber piece (1) formed in a segment shape.
0), steel segments (20a, 20b) are juxtaposed on both sides, and a rubber piece (10) is sandwiched between the steel segments (20a, 20b). Piece (1
0) and a plurality of screw rods (30a, 30a, 30a...) For loosely inserting the inside main girder (21b, 21b) of both steel segment bodies (20a, 20b), and the respective screw rods (30a, 30a, 30a...). 30a) is screwed together on both outer sides of the inner main girder (21b, 21b) of the steel segment body (20a, 20b), and the rubber piece (10) is temporarily compressed by both steel segment bodies (20a, 20b). The two ends of each screw rod (30a) are connected with nuts 31 and 31.
A flexible segment which is detachably fixed to the outer main girder (21a, 21a) of b). 7. A rubber piece (1) formed in a segment shape.
0), the steel segment bodies (20a, 20b) are juxtaposed on both sides, a rubber piece (10) is sandwiched between the steel segment bodies (20a, 20b), and the one steel frame segment body (20a) is formed. Screw barrels (22a, 22a, 22a ...) projecting inward at a plurality of locations of the outer main girder (21a), and the outer main girder (21a) of the other steel frame segment body (20b). The screw cylinders (22b, 22b, 22a, 22a, 22a, 22a, 22a, 22a,.
22b, 22b...), And between the opposed screw cylinders (22a, 22b), the inner main girder (21) of both steel frame segment bodies (20a, 20b).
b, 21b) and the rubber piece (10).
0a) are screwed together, and the screw bar (30a) and the screw cylinders (22a, 22b) are compressed with the rubber pieces (10) appropriately by the steel frame segment bodies (20a, 20b). When the screw rod (30a) is screwed into one side of the screw tube (22a, 22b), both ends are screwed into both screw tubes (22a, 22b), and when the screw rod (30a) is screwed into the other side, one end side is screw tube (22a, 22b). 22b) a flexible segment sized to be unthreaded with either one. 8. A rubber piece (1) formed in a segment shape.
0), steel segments (20a, 20b) are juxtaposed on both sides, and a rubber piece (10) is sandwiched between the steel segments (20a, 20b). Piece (1
0) and a plurality of screw rods (30a, 30a, 30a...) For loosely inserting the inside main girder (21b, 21b) of both steel segment bodies (20a, 20b), and the respective screw rods (30a, 30a, 30a...). 30a), both steel segment bodies (20a, 20b)
Screwed on both outer sides of the inner main girder (21b, 21b) of the two steel segments (20a, 20b).
0) are connected with nuts (31, 31, 31,...) For temporarily compressing, and both ends or one end of each of the screw rods (30a) are connected via detachable connecting pieces (34). (20a,
20b) flexible segments connected to the outer main girders (21b, 21b).