JPH086871Y2 - Sealed lid mounting structure for bolt box for connecting segment pieces - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a structure for mounting a closed lid of a bolt box for connecting segment pieces, and in particular, when a tunnel is constructed by excavating the ground by an unillustrated excavating machine, the inner wall of the excavating hole is formed. After arranging segment pieces made of concrete or iron plate in a ring shape and connecting and fixing adjacent segment pieces with bolts and nuts to assemble a ring-shaped shield, put a ring-shaped secondary lining concrete on the inside. Prior to this, the present invention relates to a sealing lid mounting structure for a bolt box for connecting segment pieces, for sealing an opening of a bolt box provided inside the segment piece.

[0002]

2. Description of the Related Art As a conventional tunnel excavation method, for example, as shown in FIGS. 9 to 11, a ground A is excavated into a substantially circular cross section by an unillustrated excavation machine.
Inside the peripheral wall (see the dashed line in FIG. 9), segment pieces 2, 2, ... Made of concrete or iron plate are arranged in a ring shape, and side wall portions of adjacent segment pieces 2, 2 that abut each other (FIG. 11, the upper and lower side wall portions) and / or the end wall portions (the left and right side portions in FIG. 10) are provided in the bolt holes 3A, 3B, 4A provided in the side wall portion or the end wall portion, and the bolt box of one segment piece 2 The bolt 5 is inserted from 3 and 4 and the nut 6 is fixed in the bolt box 3 and 4 of the other adjacent segment piece 2 to construct the ring-shaped shield 1 inside the peripheral wall of the excavation hole A. Shielding method for urban tunnels (excluding the flexible synthetic resin sheet 7 and secondary lining concrete 8 in FIG. 9) and a ring-shaped structure similar to the above, with adjacent segment pieces The side wall portion and or end wall 2,2, bolt hole 3A provided on the same side wall and the end wall portion, 3B,
4A, bolt 5 is inserted, nut 6 is fixed, and drilling hole A
After constructing the ring-shaped shield 1 on the inner side of the peripheral wall, a flexible synthetic resin sheet 7 for preventing water is arranged in a cylindrical shape and fixed by appropriate means, and thereafter, the ring-shaped shield 1 and A ring-shaped reinforcing bar 8A having a substantially same shape and a smaller diameter than that is provided, and a concrete formwork 9 having a smaller diameter (in FIG. 9, only the upper half part of the placement position of the concrete formwork 9 is provided on one side). (Represented by a chain line) is arranged, and necessary columns (not shown) are erected inside the concrete formwork 9, and a secondary cover is provided between the concrete formwork 9 and the soft synthetic resin sheet 7. Urban area where 8 concrete tunnels are struck to build a tunnel, especially in the low ground area,
It is known to be a tunnel construction method for riverbed or seabed.

Incidentally, C in FIG. 9 is a roadbed provided with facility passages and the like. Although not shown in the figure, a small tunnel without the roadbed C as shown in FIG. 9 is also constructed by a construction method substantially similar to this.

In the conventional urban tunnel shield construction method, the segment pieces 2, 2, ... Are arranged in a ring shape along the peripheral wall of the excavation hole A, and one of the adjacent segment pieces 2, 2 is arranged. Bolts 3 from the bolt boxes 3 and 4 to the bolt holes 3A, 3B and 4A provided on the side walls thereof, and bolt holes 3A, 3B and 4A of the bolt boxes 3 and 4 of the other adjacent segment piece 2 are inserted. The nuts 6 and 6 are fixed at the 4A portion to construct the ring-shaped shield 1, and the bolts 5 and 5 have the lengths of the bolt boxes 3 and 4 of the segment pieces 2 and 2 and side wall portions or ends thereof. This means that the thickness of the wall portion exceeds twice the thickness, and thus the long bolts 5 and 5 from the bolt boxes 3 and 4 of one segment piece 2 to the bolt holes 3A and 4 of the small diameter.
In order to secure the efficiency of the assembling work, the bolt boxes 3 and 4 are inserted into the bolt box 3 and 4 of the other segment piece 2 and the nuts 6 and 6 thereof are rotated and tightened.
Were usually fairly large.

The dimensions of the segment pieces 2, 2 arranged inside the peripheral wall of the excavation hole A of the tunnel are, for example, about 4 m in length, about 1 and 5 m in width, and about 0.5 in thickness.
Since it is usually constructed as a concrete block of about m and its weight is considerably large, it is necessary to construct the bolt boxes 3 and 4 to be considerably large also from the viewpoint of ensuring ease of handling. .

As described above, the segment pieces 2, 2 ... Are arranged in a ring shape, and adjacent ones are bolts 5, 5 ... Nuts 6, 6 ... After constructing the above, for example, a soft synthetic resin sheet 7 for waterproofing is stretched in a tubular shape and sealed inside the ring-shaped shield 1, and then a reinforcing reinforcing bar 8A is arranged inside the soft synthetic resin sheet 7. Further, a concrete formwork 9 is provided on the inside thereof, and a ring-shaped secondary lining concrete 8 is laid between the concrete formwork 9 and the soft synthetic resin sheet 7 to reach a thickness of several tens of centimeters. It was a thing.

For this reason, when the secondary lining concrete 8 is poured, a part of the secondary lining concrete 8 that is pressurized and injected into the concrete form 9 is a part of the soft synthetic resin sheet 7.
Together with a part of the bolt pieces 3, 4 are press-fitted into the bolt boxes 3, 4 inside the segment piece 2.
The concrete that has flowed in will harden at the same time as the ring-shaped portion.

Further, each of the sedament pieces 2, 2 ... Inside the ring-shaped shield 1 is provided with an inner bolt box 3, 4.
After filling a styrofoam block (not shown),
Inside the ring-shaped shield 1, a soft synthetic resin sheet 7 for waterproofing is stretched in a tubular shape, and a reinforcing bar 8A and a concrete form 9 are arranged on the inside thereof. The concrete form 9 and the soft synthetic resin sheet Between 7 and 8 secondary lining concrete
A hitting shield method has already been proposed.

Further, although not shown, JP-A-60-11
In JP-A-5,798, an opening of a connecting bolt box of a segment piece forming a ring-shaped shield is covered with a plate-shaped lid having a diameter larger than the opening, and both side portions of the plate-shaped lid are covered. Of the closed lid, in which a bent piece standing upright from the cut is locked in the opening to secure the closed state, thereby preventing press-fitting of the secondary lining concrete into the opening.

[0010]

However, as described above, the segment pieces 2, 2 are formed inside the peripheral wall of the excavation hole A.
... are arranged in a ring shape, and the ring-shaped shield 1 is constructed by connecting and fixing them with bolts 5, 5, ..., nuts 6, 6, ..., and then a soft synthetic resin sheet 7 for waterproofing is provided inside thereof. Is stretched in a tubular shape for sealing, a reinforcing bar 8A and a concrete formwork 9 are provided on the inside, and a secondary lining concrete 8 is laid between the concrete formwork 9 and the soft synthetic resin sheet 7. In the tunnel shield construction method, when the bolt boxes 3 and 4 of the segment piece 2 are not filled with a styrofoam block or the like, a part 8a of the secondary lining concrete 8 (in FIG. 9, only a part thereof is broken line). 8a) is press-fitted into the bolt boxes 3 and 4 together with the soft synthetic resin sheet 7, and the bolt boxes 3 and 4 are
A part 8a of the concrete press-fitted therein hardens at the same time as its ring-shaped portion indicated by reference numeral 8 in FIG. 9, and as the hardening progresses, the secondary lining concrete 8 and the bolt box 3, 4 parts The volume of the portion 8a press-fitted into the contracts.

Then, the concrete 8 which is press-fitted into the bolt boxes 3 and 4 of the segment piece 2 and hardens
With respect to a, the segment piece 2 itself does not shrink because it has been sufficiently hardened in advance, and therefore movement from the bolt box 3, 4 region is restricted.

For this reason, between the adjacent bolt boxes 3 and 4 of the segment piece 2 of the secondary lining concrete 8, specifically, the left and right (FIG. 11) both sides and the central portion inside each segment piece 2. Of the concrete box 8 which is located between the bolt boxes 3 and 4, 4 and 4 and the adjacent bolt boxes 3 and 3, 4 and 4 of the adjacent segment pieces 2 and 2 and which has a ring shape. The tensile force is generated due to the volume contraction accompanying the progress of the hardening, and the strength of the ring-shaped concrete 8 part is cracked and its strength is lowered. Water will leak to.

A part 8a of the secondary lining concrete 8
When the soft synthetic resin sheet 7 is press-fitted into the bolt boxes 3 and 4 at the same time, the soft synthetic resin sheet 7 is forcibly press-fitted into the bolt boxes 3 and 4 and is damaged, so that the sealing effect is reduced and the secondary cover From the cracks generated in the work concrete, this also contributes to the promotion of leakage of groundwater into the tunnel.

The segment pieces 2, 2, ...
Bolts 5 and nuts 6 are arranged in a ring shape and are adjacent to each other.
Then, the ring-shaped shield 1 is constructed by connecting and fixing with a styrofoam block (not shown) in the bolt boxes 3 and 4, and then the soft synthetic resin sheet 7 is placed inside thereof.
Is provided in a tubular shape, a reinforcing steel bar 8A and a concrete formwork 9 are provided on the inside thereof, and a secondary lining concrete 8 is placed between the concrete formwork 9 and the soft synthetic resin sheet 7. Press-fitting of a part of the lining concrete 8 into the bolt boxes 3 and 4 is blocked, and the shrinkage-preventing factor of the ring-shaped portion of the secondary lining concrete 8 is removed to prevent cracking of the same. However, when this construction method is carried out, as is clear from the size of the bolt boxes 3 and 4, a large amount of the styrofoam block is filled so that a considerable area of the tunnel excavation hole A or the ring-shaped shield 1 is filled. However, there was a problem in that the workability of tunnel construction was significantly reduced.

Further, if the method of adhering the peripheral wall of the excavation hole A to the foamed styrene block with a solvent or the like is adopted, volatilization of the same volume agent causes the tunnel to be filled with the volume agent, which is dangerous. However, it was difficult to adopt this method.

Further, in the closed lid structure described in JP-A-60-115,798, not only is the peripheral portion of the opening not completely closed, but also the side edge portion of the thin metal plate is formed. Since the lid is locked in the opening simply by engaging the folded piece from the cut portion and the side wall of the opening, it cannot be said that the lid body is sufficiently secured in the opening. I didn't like it.

This invention was made by paying attention to the problems in the conventional example as described above, and the segment pieces 2, 2 ... Are arranged in a ring shape inside the peripheral wall of the excavation hole A, and the bolts 5, 5 are formed. ..., the nuts 6, 6 ... are stopped to construct the ring-shaped shield 1, and then the segment pieces 2, 2
... Openings 3A and 4A of inner bolt boxes 3 and 4
A flexible retaining claw 15 having downwardly facing claw pieces 17 and 27;
The sealing lids 10, 20, 50, 60 equipped with the guides 25, 25, 52 with 25 are attached to the sealing lids 10, 20, 50, 60 by pressure so that they cannot be removed. Coating, double-sided adhesive tape, velvet fastener attachment, locking pieces 14, 54 with grooves 14A, 54A, 64A,
A mounting means such as 64 or a suspending means such as a gourd-shaped protrusion 24 is provided, and the soft synthetic resin sheet 7 for waterproof disposed inside the ring-shaped shield 1 is provided in the mounting means or the suspending means.
While strongly pressing the contact portion of the above, to mount and support the same soft synthetic resin sheet 7 for waterproofing, or to strongly press and install the hanger 30 having the concave portion 31 that engages with the hanging means such as the gourd-shaped protrusion 24. By suspending and supporting the reinforcing steel bars 8A of the secondary lining concrete 8 on the suspending tool 30 via suspending means such as bolts, the above-described problem can be solved. It is intended to provide a lid mounting structure.

[0018]

In order to solve the above-mentioned problems, the present invention proposes a bolt box (3, 3) of a segment piece (2, 2, ...) Which constitutes a ring-shaped shield (1) by connection. 4) In the openings (3D, 4D),
A sealing lid (20) having a guide (22) having a diameter slightly smaller than the top of the opening (3D, 4D) is arranged, and the guide (22) has a downwardly projecting claw piece (27) which is flexible. A pull-out preventing claw (25) is provided, and the downwardly facing claw piece (27) is pushed to the inner wall of the top of the opening (3D, 4D) by strong pressure on the opening (3D, 4D) of the sealing lid (20). In addition to frictional engagement, the downward pulling force is applied to the sealing lid (20) to expand the downwardly facing claw piece (27) to more strongly frictionally engage the peripheral wall of the opening (3D, 4D), and , An adhesive is applied to the lower side of the sealing lid (10, 20, 50, 60), a velvet fastener or a double-sided adhesive tape is attached, or a groove (14A, 54A, 6)
4A) Attaching means such as forming locking pieces (14, 54, 64) with attachments are provided, and the attaching means is made of a waterproof synthetic resin sheet (7) disposed inside the ring-shaped shield (1). It is a sealing lid mounting structure of the bolt box for connecting the segment pieces that pressed against the contact part and supported under suspension.
Further, a gourd-shaped protrusion (hanging tool) is provided below the sealing lid (20).
A secondary lining provided inside the ring-shaped shield (1) via a hanger 30 provided with (24) and having a recess 31 that engages with the gourd-shaped protrusion (hanger) (24). A reinforcing reinforcing bar (8A) of concrete (8) is supported by suspension, and further, a gourd-shaped protrusion (hanging tool) (24) provided on the lower side of the sealing lid (20) is attached to the gourd-shaped Mole (hanging tool) (2
4) The lifting tool 30 having the concave portion 31 that engages with the 4) is strongly pressed through the waterproof soft synthetic resin sheet (7) arranged inside the ring-shaped shield (1), and thus the waterproof soft synthetic resin is provided. While the seat (7) has a curved portion 7B at which the contacting portion is curved to support the seat (7), a secondary member disposed inside the ring-shaped shield 1 via suspending means such as a bolt 32 extending from the suspending tool 30. Reinforcing bar (8) for lining concrete (8)
It is a suspension support of A).

(Operation) Since the present invention has the above-mentioned structure, the excavation hole A
Segment piece 2 arranged in a ring shape inside the peripheral wall of
2 ... Insert bolts 5 from the bolt boxes 3 and 4 of one of the adjacent segment pieces 2 toward the bolt boxes 3 and 4 of the other segment piece 2, and bolts of the other segment piece 2 After tightening the nut 6 in the boxes 3 and 4, the openings 3 in the bolt boxes 3 and 4
By placing the sealing lids 10, 20, 50, 60 on the D, 4D and pressing the sealing lids 10, 20, 50, 60 strongly to the openings 3D, 4D, the guides 12, 22, 52, 6 thereof are formed.
Flexible retaining claws 15 and 25 protruding from 2 downward claw pieces 1
7 and 27 are frictionally engaged with the top side walls of the openings 3D and 4D to seal the openings 3D and 4D, and the closing lids 10, 20, 50 and 60 are provided with downward pulling force, thereby the claws are provided. The pieces 17 and 27 are more firmly friction-engaged with the top side walls of the openings 3D and 4D, and the openings 3D and 4D.
Ensure the tightness of. On the other hand, the sealing lids 10, 20,
Adhesive is applied to the outside of 50, 60, velvet fastener or double-sided adhesive tape is attached, or groove 17A,
By providing attachment means such as the locking pieces 14, 54, 64 with 54A, 64A, the waterproof soft synthetic resin sheet 7 disposed inside the ring-shaped shield 1 is pressed from the inside by the attachment means. By doing so, it is attached to the facing portion of the attachment means, and is engaged with the gourd-shaped protrusion (suspension means) 24, which is attached to the gourd-shaped protrusion (suspension means) 24 provided outside the sealing lid 20. Lifting tool 30 having a concave portion 31
Is strongly pressured and attached, and the attachment means 3 is attached to the hanging tool 30.
The reinforcing steel bar 8A of the secondary lining concrete 8 arranged inside the ring-shaped shield 1 is hung via the louver, and the hanger 30 to the gourd-shaped protrusion (hanging means) 24 is hung.
At the time of strong pressure engagement of the gourd-shaped protrusion (suspension means) 2
4. The soft synthetic resin sheet for waterproofing 7 located around 4 is curved 7B to be sandwiched between the two, while the secondary lining concrete 8 is reinforced through attachment means such as bolts 32 extending from the hanger 30. The reinforcing bar 8A is suspended and supported on the sealing lid 20.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a sealing lid mounting structure of a bolt box for connecting segment pieces according to the present invention will be described below with reference to FIG.
It will be described with reference to FIGS. 9 to 1
The same names and the same reference numerals are used for the portions common to the conventional example shown in FIG.

(First Embodiment) FIGS. 1 to 4 schematically show a first embodiment of a sealing lid mounting structure of a bolt box for connecting segment pieces according to the present invention. FIG. Of the segment piece 2 is press-fitted into the opening 3D (or 4D) of the bolt box 3 (or 4) of the segment piece 2, FIG. 2 is a schematic enlarged vertical section explanatory view of its main portion, and FIG. Bolt box 3 (or 4) opening 3D (4D)
4 is a schematic side view showing the state in which the sealing lid 10 is attached, FIG.
[FIG. 3] is a schematic inner plan explanatory view thereof.

In FIGS. 1 to 4, 2 is a concrete segment piece, 3 and 4 are bolt boxes provided inside the segment piece 2, 3A and 4A are bolt holes provided in side walls of the bolt boxes 3 and 4, and 3D and 4D are openings of bolt boxes 3 and 4, and 5 is bolt holes 3A and 4A.
Bolts, 6 are nuts, and these structures are shown in Fig. 9.
It is almost the same as the conventional example schematically shown in FIG.

Reference numeral 10 is a sealing lid for sealing the openings 3D or 4D of the bolt boxes 3 and 4 of the segment piece 2, and 11
Is a plate-shaped lid main body of the sealing lid 10, and the plate-shaped lid main body 11 has substantially the same shape as the opening 3D or 4D of the bolt boxes 3 and 4 and has a slightly larger diameter. Reference numeral 12 is a guide provided upright on the plate-shaped lid main body 11 of the segment piece 10, and the guide 12 is the opening 3D of the bolt box 3 or 4,
It is almost the same shape as 4D, and is configured in a tubular shape with a slightly smaller diameter than that. Reference numeral 13 denotes a medium-wide dovetail-shaped groove provided laterally outside the guide 12.

Reference numeral 14 denotes an engaging piece with a groove 14A provided on the lower side (FIG. 1) of the plate-like lid body 11. A groove 14A of this engaging piece 14 has a bolt (not shown) for suspending the reinforcing bar 8A. It is possible to attach the hanging equipment. If the engaging piece 14 is provided over the entire length of the plate-shaped lid main body 11, a reinforcing effect of the plate-shaped lid main body 11 can be expected by the engaging piece 14. 15
Is a dovetail-shaped ridge, and 16 is a dovetail-shaped ridge projecting on the back side of the flexible edging claw 15 so as to extend in the lateral direction. The dovetail-shaped ridge 16 is a dovetail-shaped ridge of the guide 12. Groove 13
Fixed in place.

Reference numeral 17 denotes a claw piece extending outwardly downward (lower right side in FIG. 2) from the flexible retaining claw 15, and the claw piece 17 connects the sealing lid 10 to the openings 3D of the bolt boxes 3 and 4, Four
When the claw piece 17 is press-fitted into D, the claw piece 17 is configured to be longer than the space between the bolt boxes 3 and 4 so as to bite into the inner side walls of the openings 3D and 4D.
By the engagement with the inner side wall of D, the sealing lid 10 irremovably frictionally engages with the inner side wall of the openings 3D, 4D of the bolt boxes 3, 4 to secure the sealed state.

(Operation of First Embodiment) First, a drilling hole A drilled by a not-shown drilling machine or the like.
(See FIG. 9) Inside the segment pieces 2, 2, ...
Are arranged in a ring shape and adjacent segment pieces 2, 2
The ring-shaped shield 1 is constructed by connecting and fixing the same with bolts 5 and nuts 6 as in the conventional example.

After that, each segment piece 2, 2 ...
The sealing lid 10 provided with the plate-shaped lid main body 11 having substantially the same shape as the openings 3D and 4D and having a slightly larger diameter than the openings 3D and 4D of the bolt boxes 3 and 4 of FIG.
2 is inserted into the bolt boxes 3 and 4, and the sealing lid 10 is pressed until the peripheral edge of the plate-shaped lid main body 11 abuts the lower surface of the segment piece 2 (FIG. 2), the guide 12 thereof is opened in the openings 3D and 4D. The end portion of the claw piece 17 of the retaining claw 15 which is press-fitted and inserted into the dovetail-shaped groove 13 of the guide 12 has the opening 3
It is pressed against the inner peripheral walls of D and 4D and bends downward (FIG. 2).

Next, when the upward pressing force of the sealing lid 10 is released, the sealing lid 10 tries to descend, but the claw piece 17 of the retaining claw 15 and the inner peripheral wall of the opening 3 are frictionally engaged with each other. As a result, the contact point between the end of the claw piece 17 and the inner peripheral wall surface of the opening 3 does not move, but is slightly lowered due to the weight of the sealing lid 10 or the like, and the claw piece 17 rotates around the contact point between the two. And the opening 3D,
The pressure contact force between the contact portion with the inner peripheral wall of 4D increases and the retaining force increases, and the opening 3 by the sealing lid 10 increases.
A strong sealed state of D and 4D is secured. It should be noted that the closing lid 10 attached to the openings 3D and 4D of the bolt boxes 3 and 4 of the segment piece 2 located below the ring-shaped shield 1 has the above-described descending force (in this case, ascending force). Does not work, but its claw 17 and openings 3D, 4D
A strong frictional force is generated by the engagement with the inner peripheral wall of, and a strong frictional engagement is secured between them in the same manner as described above.

Outside the plate-shaped lid body 11 of the sealing lid 10 (see FIG. 2).
Then, for example, a double-sided adhesive tape or a velvet type fastener is attached in advance to the lower side), or the sealing lid 10 is inserted into the openings of the bolt boxes 3 and 4 of the ring-shaped shield 1 and frictionally engaged. After fixing, the plate-shaped lid body 1
Apply adhesive to the bottom surface of 1.

Thereafter, the waterproof soft synthetic resin sheet 7 is arranged in a cylindrical shape along the inside of the ring-shaped shield 1 constructed in the ground B as described above, and the plate-shaped lid main body 11 is, for example,
The soft synthetic resin sheet 7 is pressed and attached to a mounting means such as a double-sided adhesive tape or a velvet fastener that has been affixed in advance, or an adhesive or the like applied to the plate-shaped lid main body 11, and then the inside thereof (see FIG. 1). On the lower side), the reinforcing rebar 8A is arranged, while the concrete formwork 9 is arranged on the inner side, and the concrete formwork 9 is supported from the inside by a pillar or the like. In the ring-shaped part between the soft synthetic resin sheet 7 and the secondary lining concrete 8
Inject.

At this time, since the openings 3D and 4D of the bolt boxes 3 and 4 of the sealing lid 10 are closed by the plate-like lid main body 11 having a slightly larger area, the bolt boxes 3 and 4 are There is no fear that the soft synthetic resin sheet 7 or the secondary lining concrete 8 will be press-fitted.

The peripheral walls of the bolt boxes 3 and 4 are formed in a pyramidal shape in which the top of the concrete segment piece 2 is narrower than the lower part of the opening in order to ensure the ease of die-cutting. A strong friction engagement state is secured by the covering force based on the flexibility of the claw piece 17 of the flexible retaining claw 15 provided outside the guide 12 of FIG.

The bolt boxes 3, 4 and their openings 3D, 4D and the sealing lid 10 are formed in a rectangular shape or a rectangular tapered tube shape as shown in FIGS. Alternatively, the guide 12 may be formed in a circular or tapered shape having the same shape, or any other shape, and the guide 12 may be formed in substantially the same shape.

The bolt boxes 3 and 4 provided on the inside of the segment piece 2 have their tops at the openings 3D,
Although not shown in the drawings, the peripheral portion of the plate-like lid body 11 of the sealing lid 10 has substantially the same shape as the openings 3D and 4D of the bolt boxes 3 and 4, and is almost the same as that of 4D. It may be configured to have the same diameter, and in this case, when the same sealing lid 10 is pressed against the bolt boxes 3 and 4, the peripheral edge portion of the plate-like lid body 11 thereof has the opening portions 3D of the bolt hocks 3 and 4. 4D, the sealing lid 10 does not come into contact with the outside of the peripheral edge of the 4D, and slightly enters the openings 3D and 4D.
Flexible stopper claw 1 provided outside the guide 12 of the sealing lid 10.
Due to the engagement with the claw piece 17 of 5, the excessive opening of the opening portions 3D, 4D into the inside is prevented, and therefore a large space may be generated below the plate-shaped lid body 11 of the sealing lid 10. Nonetheless, even in this case, an effect similar to that of the sealing lid 10 can be expected.

In the above description, the dovetail-shaped groove 13 on the outer side of the guide 12 of the sealing lid 10 is provided with a flexible retaining claw 15 having a dovetail-shaped protrusion 16 similar to that, and the dovetail-shaped protrusion 1 thereof.
Although the example in which 6 is fitted and attached has been described, this flexible retaining claw 15 is not shown, but can be directly adhered to the guide 12 by an adhesive without forming the dovetail-shaped protrusion 16 thereof. Further, the flexible retaining claw 15 and the guide 12, and thus the flexible retaining claw 15 and the guide 12 and the plate-like lid main body 11 of the sealing lid 10 can be integrally configured. In this case, the structure of the same part is simplified and its handling is further simplified.

(Second Embodiment) FIG. 5 is a schematic longitudinal cross-sectional view of the essential parts of a second embodiment of the structure for mounting the sealing lid of the bolt box for connecting segment pieces according to the present invention. The same names and reference numerals are used for the parts common to the first embodiment shown in FIGS. 1 to 4.

In FIG. 5, 2 is a segment piece, 3
(4) is a bolt box provided inside the segment piece 2, 3D (4D) is an opening of the bolt box 3 (4), 7 is a soft synthetic resin sheet for waterproofing, 7A is a projection from the soft synthetic resin sheet 7, An engaging member 10 whose end is formed in an arrow shape, 10 is a sealing lid having a rectangular shape in plan view (see FIG. 4), 11
Is a rectangular plate-shaped lid main body of the sealing lid 10, 12 is a rectangular guide that stands slightly inward from the peripheral edge of the plate-shaped lid main body 11 along the entire circumference thereof, and 13 is the entire central portion of the guide 12. A dovetail-shaped groove provided in the, a locking piece with a groove 14A provided in the lower portion of the plate-shaped lid body 11 of the sealing lid 10, a flexible retaining claw 15
Reference numeral 16 is a dovetail-shaped projection provided inside the flexible retaining claw 15, and the projection 16 is fitted in the dovetail-shaped groove 23. 17
Is a downwardly facing (FIG. 5) claw piece of the flexible retaining claw 15.

The sealing lid 10 is formed in substantially the same shape as the opening 3A (4A) of the bolt box 3 (4) of the segment piece 2, and the opening 3 is formed in the bolt box 3 (4).
The flexible retaining claw 2 is inserted from the opening side of A (4A).
By the elastic and frictional engagement between the claw piece end portion 27 of No. 5 and the inner wall of the opening portion 3A (4A) of the bolt box 3 (4), it is attached to the opening portion 3D (4D) almost in the same manner as the first embodiment. To be done.

(Operation of the Second Embodiment) The operation of the second embodiment is that the segment pieces 2, 2, ...
-Is arranged in a ring shape and bolts, nuts 5 and 6 are fastened to construct a ring-shaped shield 1, and openings 3D and 4D of the bolt boxes 3 and 4 of the segment piece 2 are provided with a flexible retaining claw 15. It is similar to the first embodiment in that it is sealed by the sealing lid 10, but in this second embodiment, the engaging element 7A having the arrow-shaped end portion provided on the waterproof soft synthetic resin sheet 7 is sealed. Locking piece 1 on the lower side of the plate-shaped lid body 11 of the lid 10
It is attached by press-fitting into the engaging groove 14A of No. 4.
The remaining operation of the second embodiment is almost the same as that of the first embodiment.

Although not shown, the groove 14 has a structure for attaching the waterproof soft synthetic resin sheet 7 to the sealing lid 1.
If a velvet fastener or a double-sided adhesive tape or the like is provided in advance in place of the locking piece with A 14, the engaging element 7A provided on the soft synthetic resin sheet 7 is omitted, and the soft synthetic resin sheet 7 is simply sealed. It can be attached simply by crimping to the lid body 11.

(Third Embodiment) FIG. 6 is a schematic vertical cross-sectional view of the essential parts of a third embodiment of the structure for attaching the sealing lid of the bolt box for connecting segment pieces according to the present invention. The same names and reference numerals are used for the parts common to the first embodiment shown in FIGS. 1 to 4.

In FIG. 6, 2 is a segment piece, 3
(4) is a bolt box provided inside the segment piece 2, 3D (4D) is an opening of the bolt box 3 (4), 7 is a soft synthetic resin sheet for waterproofing, 7B is slack of the soft synthetic resin sheet 7 for waterproofing 8A is a reinforcing bar of the secondary lining crepe 8; 20 is a sealing lid having a rectangular shape in plan view; 21 is a rectangular plate-shaped lid main body of the sealing lid 20; 22 is a peripheral edge of the plate-shaped lid main body 21. A straight cylindrical guide standing upright along the entire inner circumference, 23 is a groove having a dovetail-shaped vertical section provided on the entire circumference of the central portion of the guide 22, 25 is a flexible retaining claw, 2
Reference numeral 6 denotes a ridge having a dovetail-shaped longitudinal section provided inside the flexible retaining claw 25, and the ridge 26 is fitted into the dovetail-shaped groove 23.
Reference numeral 27 is a flexible claw piece that faces downward (FIG. 6) of the flexible retaining claw 25.

The sealing lid 20 is formed in substantially the same shape as the opening 3A (4A) of the bolt box 3 (4) of the segment piece 2, and the opening 3 is formed in the bolt box 3 (4).
The flexible retaining claw 2 is inserted from the opening side of A (4A).
By the contact between the end of the claw piece 27 of No. 5 and the inner wall of the opening 3D (4D) of the bolt box 3 (4), the flexibility or elasticity of the claw piece 27 and the frictional engagement between the two. In the same manner as in the first embodiment, the opening 3D (4D) is fitted.

Reference numeral 24 is a gourd-shaped protrusion (suspension means) provided at the lower portion of the plate-shaped main body 21 of the hermetically-sealed lid 20, reference numeral 30 is a hanger having a concave portion 31 that engages with the gourd-shaped protrusion 24, and reference numeral 32 is a suspension. Ingredient 31
Is a bolt for extending and fixing the reinforcing reinforcing bar 8A, and 33 is a nut. The reinforcing bar 8A is
Instead of the bolt 32 and the nut 33, a metal wire or the like may be used for suspension fixing.

(Operation of the third embodiment) The bolt box 3 (inside the ring-shaped shield 1 is constructed by fixing and connecting the ring-shaped segment pieces 2, 2 ... With bolts 5 and nuts 6. 4) After the sealing lid 20 is fitted and sealed in the opening 3A (4A) of 4) in the same manner as in the first embodiment, it is placed inside the ring-shaped shield 1, that is, inside each segment piece 2, 2 ... The waterproof soft synthetic resin sheet 7 is arranged in a cylindrical shape, and the gourd-shaped protrusion 24 protruding from the plate-like lid main body 21 of the sealing lid 20 is arranged from the inside (lower side in FIG. 6) of the soft synthetic resin sheet 7. In the opposite direction, by press-fitting the hanger 30 so as to engage the recess 31, the flexible synthetic resin sheet 7 is deformed to form a substantially spherical curved portion 7B, and the bolt 32 of the hanger 30 is deformed. Together with the lower side of the sealing lid 20 (Fig. 6) Therefore, it is suspended and fixed inside the ring-shaped shield 1.

After that, the reinforcing steel bars 8A are arranged inside the ring-shaped shield 1 and passed through the bolts 32 to fix the nuts 33, or the end portions of the bolts 32 are attached and fixed by hanging wires (not shown) or the like. After that, a concrete formwork 9 (see FIG. 9) is placed inside the concrete formwork 9, and the concrete formwork 9 is supported from the inside by a pillar (not shown). Then, the concrete formwork 9 and the waterproof soft synthetic resin sheet 7 are In the meantime, as in the first embodiment, the secondary lining concrete 8 is poured.

(Modification of Third Embodiment) Although not shown, the plate-like lid body 2 of the sealing lid 20 shown in FIG.
1, instead of the gourd-shaped protrusion 24 provided on the lower side, a gourd-shaped cross-section having almost the same shape as that of the gourd-shaped protrusion 24 is provided, and a locking projection (suspension means) is provided to extend in the length direction of the plate-like lid main body 21. , A rod-shaped hanger having substantially the same shape as the locking ridge and having a recess having a slightly larger diameter cross section than that, is fitted together with the soft synthetic resin sheet 7 over the entire length in the length direction of the locking ridge. If it is configured to be insertable, the holding force of the soft synthetic resin sheet 7 is further enhanced.

Further, one to several hanging bolts are projected from this rod-shaped hanging tool, and the reinforcing bar 8 is provided at the end of the hanging bolt.
It can also be configured to suspend A. It should be noted that, for example, a double-sided adhesive tape, a velvet type fastener or the like is attached to the lower surface (FIG. 6) of the plate-like lid body 21 of the sealing lid 20, while a nonwoven fabric is attached to the upper side of the vinyl sheet 7 (FIG. 6). Once attached, the soft synthetic resin sheet 7 can be attached and held by simply pressing it on the inside of the segment piece 2 of the ring-shaped shield 1, and the soft synthetic resin sheet 7 for waterproofing at a construction site of a tonnel such as a wetland. Installation of
It's even easier.

(Fourth Embodiment) FIG. 7 is a schematic perspective view of the rear surface of the sealing lid of the fourth embodiment of the structure for attaching the sealing lid of the connecting bolt box for segment pieces according to the present invention. The same names and reference numerals are used for the parts common to the first embodiment shown in FIGS. 1 to 4.

In FIG. 7, reference numeral 50 is a rectangular sealing lid, and this sealing lid 50 is formed in substantially the same shape as the openings 3D, 4D of the bolt boxes 3, 4 of the segment piece 2 (see FIGS. 3, 4). . Reference numeral 51 is a rectangular plate-shaped lid main body of the closed lid 50, 52 is a cylindrical guide provided upright on the peripheral edge of the plate-shaped lid main body 51 so as to be positioned slightly inward of the peripheral edge.
Reference numeral 53 denotes a dovetail-shaped groove provided in a lateral direction on the outer side of the guide 52 and having a dovetail-shaped vertical section. In this dovetail-shaped groove 53, a dovetail-shaped flexible dovetail claw 15 similar to the flexible dovetail claw 15 of FIG. Ridges (16)
Is inserted. As the coupling structure between the flexible retaining claw 15 and the guide 51 of the sealing lid 5.0, another coupling structure can be selected, such as applying an adhesive between them to fix them.

The sealing lid 50 is press-fitted and fixed in the openings 3D and 4D of the bolt boxes 3 and 4 of the segment piece 2 in the same manner as in the first embodiment. Is almost the same as. In addition, 54 is a sealing lid 50
The locking piece with the groove 54A provided on the lower side (FIG. 7) of the plate-like lid main body 51 of FIG. Code "7A"
(See) and insert the same synthetic resin sheet 7.

(Fifth Embodiment) FIG. 8 is a schematic perspective view showing the back surface of the sealing lid of the fifth embodiment of the sealing lid mounting structure of the bolt box for connecting segment pieces according to the present invention. The same names and reference numerals are used for the parts common to the first embodiment shown in FIGS. 1 to 4.

In FIG. 8, 60 is a rectangular sealing lid, and this sealing lid 60 is the segment piece 2 (see FIG. 3,
4), the openings 3D and 4D of the bolt boxes 3 and 4 have substantially the same shape. Reference numeral 61 is a rectangular plate-shaped lid main body of the closed lid 60, 62 is a guide that stands on the left and right side edge portions (FIG. 8) of the plate-shaped lid main body 61 slightly inward of the same side edge, and 63 is an outer side of the guide 62. (Lower side in FIG. 8) A groove having a dovetail-shaped longitudinal section provided in the lateral direction (left and right direction in FIG. 8) of the central portion,
In this dovetail-shaped groove 63, the flexible retaining claw 15 shown in FIG.
A dovetail-shaped ridge (16) having a flexible retaining claw having substantially the same structure as the above is fitted.

The flexible retaining hook 15 (see FIGS. 1 and 2) and the guide 61 of the sealing lid 60 can be attached by other fixing means such as applying an adhesive between them. Reference numeral 65 is a reinforcing rib provided on the upper side (FIG. 8) of the plate-shaped lid body 61.

The sealing lid 60 is press-fitted and fixed in the openings 3D and 4D of the bolt boxes 3 and 4 of the segment piece 2 in the same manner as in the first and third embodiments, and functions similar to those. . Incidentally, in this fifth embodiment, the sealing lid 60
Since the guides 62 are erected only on both the left and right side portions (FIG. 8) of the sealing lid 60, the elasticity of an unillustrated retaining claw (for example, see reference numeral 15 in FIG. 1) attached to the guide 62 is increased. It is good to take measures to increase the holding power.

Reference numeral 64 is a locking piece provided on the lower side (FIG. 8) of the plate-shaped lid body 61 of the sealing lid 60. The locking piece 64 has the locking piece 54 of the sealing lid 50 of the fourth embodiment. Similar to the engaging groove 54A, the engaging groove 64A is provided with an engaging member having an arrow-shaped end similar to the engaging member 7A (see FIG. 5) of the second embodiment shown in FIG. The synthetic resin sheet 7 is fitted. The other operation is almost the same as that of the above-mentioned embodiment.

[0057]

[Effects of the Invention] (1) Segment pieces 2, 2 ...
Sealing lid 1 to opening 3D, 4D of bolt box 3, 4 of
By a simple operation of simply pressing 0, 20, 50, 60, the downward stopper claw pieces 17, 27 of the flexible retaining claws 15, 25 provided on the guides 12, 22, 52, 62 are opened.
The openings 3D, which are frictionally engaged with the top inner side walls of D and 4D,
In addition to securely sealing 4D, the sealing lids 10, 20, 5
When downward pulling force is applied to 0 and 60, the same sealing lid 1
The downwardly facing claw pieces 17, 27 of 0, 20, 50, 60 more strongly frictionally engage the inner walls of the tops of the openings 3D, 4D to make the openings 3D, 4D by the sealing lids 10, 20, 50, 60. The sealed state is secured more firmly.

(2) Sealing lid 1 for opening 3D, 4D of bolt boxes 3, 4 of segment pieces 2, 2 ...
Since 0, 20, 50 and 60 are frictionally engaged with a strong piece, a soft synthetic resin for waterproofing into the openings 3D and 4D when the secondary lining concrete is put inside the ring-shaped shield 1 There is no risk of the sheet 7 or a part of the secondary lining concrete 8 being pushed in. Therefore, due to hardening of the concrete that has flowed into the bolt boxes 3 and 4 parts, the ring-shaped portion of the secondary lining concrete 8 is excessively hardened. Therefore, it is possible to effectively suppress the generation of cracks in the ring-shaped portion of the secondary lining concrete 8 without causing the generation of tensile force.

(3) Sealing lid 1 for opening 3D, 4D of bolt box 3, 4 of segment pieces 2, 2 ...
Since 0, 20, 50, 60 frictionally engaged with each other strongly, an adhesive was applied to the lower side of the sealing lid 10, 20, 50, 60, and double-sided adhesive tape or velvet fastener was attached.
Alternatively, the locking pieces 14, 54, 6 with the grooves 14A, 54A, 64A
A sealing lid for covering the openings 3D, 4D of the segment piece 2 from below the soft synthetic resin sheet 7 for waterproofing disposed inside the ring-shaped shield 1 by providing mounting means such as 4 10, 20, 50, 6
It can be easily hung and supported by a simple operation of pushing to the 0 side, and the amount of preparatory work for placing the secondary lining concrete 8 can be significantly reduced compared to the conventional example, and the efficiency can be improved.

(4) Sealing lid 1 for opening 3D, 4D of bolt box 3, 4 of segment pieces 2, 2 ...
Since 0, 20, 50, 60 are frictionally engaged with each other strongly, by providing a gourd-shaped protrusion (hanging tool) 24 on the lower side of the sealing lid 10, 20, 50, 60, the gourd-shaped protrusion is provided. The (reinforcing tool) 24 can suspend and support the reinforcing rebar 8A of the secondary lining concrete 8 disposed inside the ring-shaped shield 1 through the suspending tool 30 having the recess 31 that engages with it. Moreover, since it is not necessary to provide a suspending means for the reinforcing bar 8A to the other portion of the ring-shaped shield 1, the amount of preparation work for placing the secondary lining concrete 8 is significantly reduced as compared with the conventional example. The efficiency can be improved.

(5) Opening 3 of segment piece 2
While providing a gourd-shaped protrusion (suspension means) 24 on the outer side of the sealing lid 10 attached to D, 4D, from the lower side of the soft synthetic resin sheet 7 for waterproofing arranged inside the ring-shaped shield, the gourd-shaped When the hanger 30 having the concave portion 31 that engages with the protrusion (suspending means) 24 is pressed, the circumference of the gourd-shaped protrusion (suspending means) 24 of the waterproof soft synthetic resin sheet 7 covers it. Curved 7B into a gourd-shaped protrusion (suspension means) 2
The reinforcing steel bars 8A of the secondary lining concrete 1 are immediately attached by means of attachment means such as bolts 32 extending from the suspension 30 to the four parts, and in this case, therefore, the soft synthetic resin sheet 7 for waterproofing is used. By using the common gourd-shaped protrusions (suspension means) 24 and the suspenders 30, the reinforcement steel bars 8A of the secondary lining concrete 1 can be easily and quickly suspended and supported under the sealing lid 20.

(6) Since the bolt boxes 3 and 4 of the segment piece 2 are sealed with the sealing lids 10, 20, 50 and 60, as in the conventional example, the bolt boxes 3 and 4 are closed.
It is not necessary to fill the styrofoam block with a filling material, and the work of transporting a large amount of styrofoam block to the construction site of the ring-shaped seed 1 configured by arranging the segment pieces 2, 2, ... When,
It is not necessary to secure a space for storing a large amount of styrofoam blocks inside the ring-shaped shield 1, and the workability of concrete lining for secondary lining at the tunnel construction site is significantly improved.

[Brief description of drawings]

FIG. 1 is a schematic longitudinal cross-sectional view showing a main part of a hermetically-sealing lid of a first embodiment of a structure for mounting a hermetically-sealing lid of a bolt box for connecting segment pieces for a tunnel according to the present invention.

FIG. 2 is an enlarged vertical cross-sectional explanatory view of a flexible retaining claw portion which is a main part thereof.

FIG. 3 is a schematic side view showing a state where a sealing lid is attached to the bolt box of the segment piece.

FIG. 4 is a schematic inner plan explanatory view of a bolt box of the segment piece in which a sealing lid is attached.

FIG. 5 is a schematic longitudinal explanatory view of a state where a synthetic resin sheet is attached to the grooved locking piece of the sealing lid of the second embodiment of the present invention by the locking piece.

FIG. 6 is a schematic side view of the third embodiment of the present invention in which a bolt hanger for suspending a concrete formwork is mounted on the gourd-shaped protrusion of the hermetically-sealed lid.

FIG. 7 is a perspective explanatory view of a sealing lid according to a fourth embodiment of the present invention.

FIG. 8 is a perspective explanatory view of a hermetically-sealing lid according to a fifth embodiment of the present invention.

FIG. 9 is a schematic vertical explanatory view of a conventional tunnel structure.

FIG. 10 is a schematic side view showing a segment piece forming a ring-shaped shield in a conventional tunnel.

FIG. 11 is a schematic inner plan view of the segment piece.

[Explanation of symbols]

 1 ... Ring-shaped shield 2 ... Segment piece 3, 4 ... Bolt hook 3A, 3B, 4A ... Bolt hole 3D, 4D ... Opening 7 ... Soft synthetic resin sheet 7A ... Engagement 7B. Curved part of the soft synthetic resin sheet 7 ...... Reinforcing rebar 9 ...... Concrete formwork 10, 20 ...... Sealing lid 11, 21 ...... Plate lid body 12, 22 ...... Guide 13, 23 ...... Hatoo groove 14 ...... Locking piece 14A ...... Groove 15,25 ...... Flexible retaining claw 17,27 ...... Claw piece 24 ...... Gourd-shaped protrusion 30 ...... Hanging tool 32 ...... Bolt (mounting tool) 50,60 ... ... Sealing lid 51, 61 ... Plate lid main body 52, 62 ... Guide 53, 63 ... Dovetail groove 54, 64 ... Locking piece 54A, 64A ... Groove 55, 65 ... Rib A ... Excavation hole

Claims (3)

[Scope of utility model registration request] 1. An opening (3D, 4D) of a bolt box (3, 4) of a segment piece (2, 2 ...) Which constitutes a ring-shaped shield (1) by connection, the opening (3D, 4D) is provided with a sealing lid (20) having a guide (22) having a diameter slightly smaller than the top, and the guide (22) is provided with a flexible retaining claw (25) having a downward claw piece (27) projecting to the outside thereof. And a downwardly facing claw piece (2) is provided by strong pressure on the opening (3D, 4D) of the sealing lid (20).
7) is frictionally engaged with the top inner side wall of the openings (3D, 4D), and the downward pulling force is applied to the sealing lid (20) to expand the downward claw pieces (27) to open the openings. (3D, 4D) Further firmly frictionally engages the peripheral wall, and an adhesive is applied to the lower side of the sealing lid (10, 20, 50, 60), and a velvet fastener or a double-sided adhesive tape is attached. Alternatively, a mounting means such as forming locking pieces (14, 54, 64) with grooves (14A, 54A, 64A) is provided, and the mounting means is disposed inside the ring-shaped shield (1) for waterproofing. A structure for mounting a closed lid of a bolt box for connecting segment pieces, characterized in that a soft synthetic resin sheet (7) is pressed against an abutting portion to be supported by suspension. 2. The opening portions (3D, 4D) of the bolt boxes (3, 4) of the segment pieces (2, 2 ...) Which constitute the ring-shaped shield (1) by connection are connected to the opening portions (3D, 4D) is provided with a sealing lid (20) having a guide (22) having a diameter slightly smaller than the top, and the guide (22) is provided with a flexible retaining claw (25) having a downward claw piece (27) projecting to the outside thereof. And a downwardly facing claw piece (2) is provided by strong pressure on the opening (3D, 4D) of the sealing lid (20).
7) is frictionally engaged with the top inner side wall of the opening (3D, 4D), and the downward pulling force is applied to the sealing lid (20) to expand the downward facing claw piece (27) to open the opening. Frictionally engage the peripheral walls of the parts (3D, 4D) more firmly,
Moreover, a gourd-shaped protrusion (hanging tool) is provided below the sealing lid (20).
A secondary lining provided inside the ring-shaped shield (1) via a hanger 30 provided with (24) and having a recess 31 that engages with the gourd-shaped protrusion (hanger) (24). A structure for mounting a closed lid of a bolt box for connecting segment pieces, characterized in that a reinforcing bar (8A) of concrete (8) is supported by suspension. 3. A gourd-shaped protrusion (hanging tool) (2) is attached to a gourd-shaped protrusion (hanging tool) (24) provided on the lower side of the sealing lid (20).
4), the suspending tool 30 having the recessed portion 31 that engages with the recessed portion 31 is strongly pressed through the waterproof soft synthetic resin sheet (7) arranged inside the ring-shaped shield (1), and thus the waterproof soft synthetic resin is obtained. While the seat (7) has a contact portion curved 7B to support the seat (7), a secondary member disposed inside the ring-shaped shield 1 via suspending means such as a bolt 32 extending from the suspender 30. Reinforcing bar (8) for lining concrete (8)
The sealing lid mounting structure for a bolt box for connecting segment pieces according to claim 2, wherein (A) is supported by suspension.