JPH07331996A - Shield tunnel lining method and gable frame structure of shield machine - Google Patents

Abstract

(57) [Summary] [Purpose] The sealing property between the auxiliary gable frame and the formwork can be improved, and the auxiliary gable frame can be efficiently moved inward, so that workability during construction can be improved. A method for covering a shield tunnel and a gable frame structure for a shield machine are provided. [Structure] A gap between the main gable frame 51 and the mold 1 is formed in a ring shape as a whole by overlapping the circumferential end portions of the ring-shaped storage groove 1d formed on the outer surface of the mold with each other. The plurality of circular arc-shaped auxiliary gable frames 51 are closed by projecting them outward. A seal member seals between the overlapping portion of the circumferential end portions of the arc-shaped auxiliary gable frame and the ring-shaped storage groove 1d of the form. After the lining material has been cast into the rebar assembly chamber, the sealing by the sealing member is released, and the auxiliary gable frame is moved inward along the ring-shaped storage groove of the form.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield tunnel lining method, and more particularly, to a shield tunnel lining method suitable for a construction method for lining a shield tunnel with a lining material such as cast-in-place concrete. The present invention relates to a construction method and a gable frame structure of a shield machine used directly for carrying out this shield tunnel lining method.

[0002]

2. Description of the Related Art As a method of lining such a shield tunnel, the applicant of the present application has proposed a method disclosed in Japanese Patent Application No. 2-283643 (Japanese Patent Laid-Open No. 161598).

That is, this type uses a shield machine having an outer cylindrical shape, and excavates the ground by a cutter device provided on the front surface of the shield machine, and at the same time, a peripheral wall of a tunnel is dug at a predetermined interval. It is covered with a frame, a reinforcing bar is arranged between the form frame and the peripheral wall, concrete is placed between the form frame and the peripheral wall, and the shield machine is sequentially advanced.

Specifically, the tail portion of the skin plate of the shield machine is double formed by the outer cylinder and the inner cylinder, and the radius of the skin plate is formed between the outer cylinder and the inner cylinder of the tail portion. A plurality of partition walls extending in the direction are formed to form a plurality of concrete piston chambers in which the pushing pistons are accommodated.

When the reinforcing bars are arranged on the inner side of the inner cylinder and the mold is assembled inside the reinforcing bars, the outer end of the main girder frame which closes the inner cylinder and the mold together with the arrangement of the reinforcing bars is arranged. While setting so as to contact the inner surface of the inner cylinder, by receiving concrete pressure applied to the gable frame as a separator instead by connecting the reinforcing bars, the gap between the inner end of the main gable frame and the outer surface of the form, After the auxiliary gable frame is protruded from the outside of the formwork to close it, the lining material is placed in the rebar assembly chamber surrounded by the inner cylinder, the formwork, and the grate frame, while the concrete piston chamber is used to form the formwork and ground. When the lining material is placed between the pile and the pressure of the lining material in the rebar assembly room and the pressure of the existing lining material are equal, the rear auxiliary gable frame is moved inward to move the lining material in the rebar assembly room. The lining material and the existing lining material are integrated, and then the Switching so as to supply the lining material from the Topisuton chamber only.

Then, the shield machine is driven while pressing the pushing piston in the concrete piston chamber by the pressure holding jack so that the pressure of the lining material becomes higher than the earth pressure and water pressure of the natural ground.

[0007]

However, the conventional shield tunnel lining method has the following problems.

That is, in the lining method, after closing the gap between the inner end of the main gable frame and the outer surface of the mold with the auxiliary gable frame protruding from the inside of the form, the inner cylinder and the form are closed. , Place the lining material in the rebar assembly room surrounded by the gable frame, and move the rear auxiliary gable frame inward at the same time as the pressure of the lining material in the rebar assembly room and the pressure of the existing lining material. It is essential to integrate the lining material in the rebar assembly chamber with the existing lining material, but how to move the auxiliary gable frame inward, or the auxiliary gable frame and formwork No specific technique is disclosed as to how to seal between the two.

The auxiliary gable frame plays a particularly important function in ensuring the sealing property of the rebar assembly chamber surrounded by the inner cylinder, the form, and the gable frame during the meandering operation of the shield machine. Efficiently moving the frame inward and improving the sealing property between the auxiliary gable frame and the form are important for implementing the method for covering the shield tunnel.

The present invention has been proposed in view of the above circumstances, and an object thereof is to enhance the sealing property between the auxiliary dam frame and the formwork and to efficiently move the auxiliary dam frame inward. (EN) It is possible to provide a shield tunnel lining method and a gable frame structure of a shield machine that can improve workability during construction.

[0011]

In order to achieve such an object, in the invention according to claim 1, the peripheral wall of the excavated tunnel is opened at a predetermined interval while excavating the ground by the cutter device at the tip of the shield machine. A shield tunnel lining method in which a rebar is placed between the mold and the peripheral wall and a lining material is supplied to cover the inner surface of the tunnel. The tail portion of the plate is double formed by the outer cylinder and the inner cylinder, and a plurality of partition walls extending in the radial direction of the skin plate are formed between the outer cylinder and the inner cylinder of the tail portion to accommodate the pushing piston. A ring for arranging a plurality of concrete piston chambers, arranging rebars inside the inner cylinder, and arranging the rebars and closing the space between the inner cylinder and the mold when the molds are assembled inside the rebars. Of the main gable frame of, while the outer end of the gable frame is set in contact with the inner surface of the inner cylinder, the concrete pressure applied to the gable frame is also received as a separator instead of connecting the reinforcing bars, and the inner end of the gable frame is A plurality of arc-shaped auxiliary gables with a gap between the outer surface of the mold and the ring-shaped storage groove formed on the outer surface of the mold are formed into a ring shape by overlapping the circumferential ends of each other with each other. The frame is closed by projecting it outward, and the space between the overlapping portions of the circumferential end portions of the arc-shaped auxiliary wife frame and the ring-shaped storage groove on the outer surface of the formwork is interposed between them. After sealing with the seal member, the lining material is placed in the rebar assembly chamber surrounded by the grate frame consisting of the inner cylinder, the formwork, the main gable frame and the auxiliary gable frame, while the concrete piston chamber is used to form the formwork. Placing lining material between the ground and the ground , When the pressure of the lining material in the rebar assembly chamber and the pressure of the existing lining material are equal, the seal by the sealing member is released, and the auxiliary wife frame on the rear side in the traveling direction is formed into a ring-shaped storage groove of the form. The lining material in the rebar assembly chamber and the existing lining material are integrated by moving the lining material along with the existing lining material, and the pressure holding jack pushes the extrusion piston in the concrete piston chamber into the lining material pressure. It is characterized in that the shield machine is advanced while being pressed so that the pressure becomes higher than the water pressure.

According to the second aspect of the present invention, a shield for blocking between the inner cylinder forming the concrete piston chamber of the tail portion of the skin plate of the shield machine and the form covering the peripheral wall of the tunnel excavated by the shield machine. A gable frame structure of a machine, in which a ring-shaped main gable frame whose outer end is set in contact with the inner surface of an inner cylinder, and the inner end of the main gable frame and the outer surface of the form block both As described above, a plurality of arc-shaped auxiliary wives are formed by overlapping the circumferential ends of each other so as to form a ring shape as a whole and project outward from a ring-shaped storage groove formed on the outer surface of the mold. A frame, a ring-shaped housing groove of the formwork, and a sealing member housing concave portion provided so as to face the overlapping portion of the circumferential end portions of the auxiliary girder frame, and the sealing member housing concave portion. The circumferential edge of the auxiliary gable frame Characterized in that it comprises a sealing member for sealing the overlapping portions of what was.

According to the third aspect of the present invention, bolts are provided in the seal groove of the mold on both sides of the auxiliary end frame with the same axial line, and the bolts are respectively formed by reaction force receiving ribs. Characterized by being supported.

According to a fourth aspect of the present invention, the end frame structure of the shield machine is characterized in that bolt rotating means for rotating the bolt is connected to the bolt.

According to a fifth aspect of the invention, the formwork includes:
A thrust transmitting portion that extends from one end to the other end of the frame is provided so as to straddle the ring-shaped storage groove, and the reaction force receiving rib is fixed to the thrust transmitting portion.

[0016]

According to the shield tunnel lining method of the present invention, the pressure of the pushing pistons in the plurality of concrete piston chambers formed in the tail portion is individually controlled by the pressure holding jacks, so that the lining material of each chamber is controlled. Since it is possible to individually manage the pressure of the ground, it is possible to easily respond to the difference in the ground pressure due to the height, and the pressure of the lining material can always be kept higher than the earth pressure and water pressure of the ground. It will be possible. Further, due to such an action, the tail void is reliably filled with the lining material, and the risk of sinking is eliminated.

Further, when the reinforcing bars are assembled, the main gable frame is arranged in contact with the inner surface of the inner cylinder of the shield machine, and the gap between the inner end of the main gable frame and the outer surface of the form is made into the form frame. Since the ring-shaped storage groove formed on the outer surface is overlapped with each other in the circumferential direction, the plurality of arc-shaped auxiliary wife frames formed in a ring shape as a whole are closed by being projected outward. , After placing the lining material in the rebar assembly room, when moving the auxiliary gable frame inward, by enlarging the overlapping part of the circumferential end parts of the auxiliary gable frame, Can be easily moved to.

Further, between the overlapping portions of the circumferential end portions of the arc-shaped auxiliary gable frame and the ring-shaped storage groove on the outer surface of the formwork are sealed by a seal member interposed therebetween. Therefore, when the lining material is placed in the reinforcing bar assembly chamber, it is possible to satisfactorily seal the overlapping portion of the circumferential end portions of the auxiliary gable frame, which is the portion where the lining material leaks most easily. .

Then, when the supply pressure of the lining material becomes larger than the set holding pressure of the pressure holding jack, and when it becomes larger than the supply pressure of the lining material, it is extruded by the supply pressure of the lining material. Since the piston is configured to move to the front of the shield machine, the extrusion piston moves to the rear of the shield machine when pushing out the lining material and to the front when putting the lining material into the piston chamber, and the concrete piston chamber The pressure can be kept almost constant even when the lining material is supplied.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the vicinity of the face of a tunnel under construction by the method of the present invention. In the figure, reference numeral 1
Reference numeral 0 denotes a shield machine, and this shield machine 10 excavates a tunnel T on the left side with respect to the paper surface by a cutter device 12 provided at the front part thereof, and a peripheral wall of the tunnel T formed behind the shield machine 10. Is covered with a mold 1 at a predetermined interval, and a rebar U is provided between the mold 1 and the peripheral wall.
Is arranged and the lining material is supplied to construct the lining wall W on the inner surface of the tunnel. The mold 1 is mainly composed of a face plate 1a and a support frame 1b for supporting the face plate 1a, and the face plate 1a of a part of the mold (upper mold) has an outside of the mold. A joint portion 1c for connecting a casting pipe 2 for casting a lining material is provided on the above, and a ring-shaped storage groove 1d for storing an auxiliary gable frame 51, which will be described later, is freely retractable. In addition,
The joint part 1c is provided with a shutter mechanism 3 for opening and closing the filling port of the joint part 1c (FIG. 4).
reference).

The shield machine 10 will be described in more detail. The shield machine 10 has a cylindrical skin plate 11 forming an outer shell, and is rotated by driving means (not shown) provided at the front end of the skin plate 11. Cutter device 12 for excavating natural ground and skin plate 11
It has a basic structure in which a partitioning plate 11a formed inside is equipped with a propulsion jack 13 whose base end is connected.

The tail portion of the skin plate 11 is doubled by an outer cylinder 20 having the same diameter as the skin plate 11 and forming a part of the skin plate 11, and an inner cylinder 21 having a smaller diameter than the outer cylinder 20. The outer cylinder 20 and the inner cylinder 21 are connected by a plurality of partition walls 22 extending in the radial direction of the skin plate 11, as shown in FIGS. 2 and 3. A plurality of (four chambers in the illustrated example) concrete piston chambers 23 are provided between the outer cylinder 20 and the inner cylinder 21, and the pushing pistons 24 are slidably accommodated in the respective concrete piston chambers 23. .

As shown in detail in FIGS. 2 to 4, the push-out piston 24 is formed in such a size that it fits tightly in the concrete piston chamber 23 in accordance with the internal shape of the concrete piston chamber 23, and the partition A plurality of pressure holding jacks 25 having base ends attached to the plate 11a are configured to slide back and forth.

The pressure holding jack 25 for operating the push-out piston 24 is provided with a relief valve so that the jack contracts when the placing pressure of the lining material exceeds the holding pressure of the jack. It has become a structure.

A plurality of (two in the embodiment) seal members 26 are attached to the outer circumference of the extruding piston 24, and the inside of the skin plate 11 and the concrete piston chamber 23 are provided at the center of the extruding piston 24. A filling hole 24a for the lining material that communicates with the filling hole 24a is formed on the inner surface of the extrusion piston 24.
A joint portion 27 is provided which communicates with a and is connected to the casting pipe 30 of the lining material (see FIG. 4).

In the embodiment, the filling hole 24a is arranged in the central portion of the pushing piston 24, but the present invention is not limited to this embodiment.

The filling hole 24a has a filling hole 24a.
A blocking mechanism 28 for opening and closing a is attached (see FIG. 4) so that the filling hole 24a can be opened and closed as needed. The shutoff mechanism 28 is specifically,
Filling hole 2 which is composed of shutter, valve, etc.
Other configurations may be used as long as they can open and close 4a.

Further, in FIG. 1, reference numeral 30 indicates a pipe for placing a lining material, and the pipe 30 for branching is connected to a supply pipe 32 of a supply pump 31 for the lining material.
Is connected to one end of the piston, and the driving pipe itself is composed of a flexible pipe or a telescopic pipe so that it can respond to the movement of the pushing piston 24.

Further, in FIGS. 1 and 2, reference numeral 50 is a main gable frame for closing the space between the inner cylinder 21 and the mold 1, and the main gable frame 50 is, as shown in FIG. It has a basic configuration in which a plurality of plate bodies 50a curved corresponding to the curvature of the inner surface of 21 are combined in a ring shape in the longitudinal direction.

Further, the inner end 50b of the main gable frame 50 is formed.
Is processed so that it is concentric with the outer edge,
In addition, since the size of the gap G (see FIG. 1) between the inner end 50b and the outer periphery of the form 1 changes due to the meandering of the shield machine, the size of the gap is set to be larger than the amount of meandering, and Care is taken so that the frame 50 is not exposed inside the formwork 1.

In the gap between the form 1 and the main gable frame 50, a plurality of auxiliary gable frames 51 for closing the gap are set.

The auxiliary gable frame 51 is basically the same as the main gable frame 50, and as shown in FIG. 2, is made of an arcuate member curved corresponding to the curvature of the inner surface of the main gable frame 50. It is a thing. That is, as shown in FIGS. 5 to 7, the auxiliary gable frame 51 is set to have a thickness of about half of the original thickness, and the circumferential end portions 51 a of the auxiliary gable frame 51 are overlapped with each other, whereby Is formed into a ring shape. In addition, the left half in FIG. 5 shows a set state in which the outer end of each auxiliary wife frame 51 is moved outward so as to contact the inner end of the main wife frame 50, and the right half in FIG. 5 shows each auxiliary wife. The state where the frame 51 is moved inward and housed inside the mold 1 is shown.

The auxiliary gable frame 51 is inserted and set in the ring-shaped storage groove 1d formed in the mold 1 so as to be movable in the radial direction of the shield machine. In addition, auxiliary wife frame 51
A groove 51b is formed at the outer peripheral end of the auxiliary girder frame 51.
When it is moved outwards, as shown in FIG.
1b engages with the inner end of the main gable frame 50.

As shown in FIGS. 9 to 12, the side wall portion 1e forming the ring-shaped storage groove 1d of the mold 1 faces the overlapping portion of the circumferential end portions of the auxiliary gable frame 51, as shown in FIGS. In addition, a recess 60 for housing the seal member is formed by recessing a part of the side wall portion 1e. A bag-shaped seal member 61 is inserted and set in the seal member accommodating recess 60, and when a fluid such as air or water is introduced into the seal member 61, the seal member 61 contacts the auxiliary wife frame 51. It swells so as to come into contact with each other, thereby closing the gap 62 between the auxiliary end frame 51 and the seal member storage recess 60 (see FIGS. 11 and 12).

Further, as shown in FIG. 13, the mold 1 is provided with bolts 6 on both sides thereof with the auxiliary end frame 51 interposed therebetween.
3a and 63b are arranged so as to have the same axis. These bolts 63a and 63b penetrate a hole 1ee formed in the side wall portion 1e forming the ring-shaped storage groove 1d and have a screw portion formed on the outer periphery thereof as a reaction force receiving member provided inside the formwork 1. Female screw portion 66 of the ribs 65a and 65b
Is supported by being screwed onto.

The bolts 63a and 63b are attached to the bolt 6
Bolt rotating means 67 for rotating 3a and 63b are connected in series. For example, as shown in FIG. 15, the bolt rotating means 67 is provided with protrusions 67a provided on the outer circumferences of the bolts 63a and 63b at intervals of 90 degrees, and the protrusion 67a is engaged with a groove at the tip thereof for rotation. If necessary, an operator or the like grips the rod 67b and engages the tip of the rod 67b with the protrusion 67a.
By rotating the bolts 63a and 63b via b,
The bolts 63a and 63b can be moved in a direction of moving toward or away from the auxiliary end frame 51.

Further, as shown in FIGS. 13 and 14, the mold 1 is formed on the mold 1 so as to straddle the ring-shaped storage groove 1d.
Is provided with a thrust transmission portion 68 that extends from one end to the other end. The thrust transmitting portion 68 includes the reaction force receiving rib 65.
Since a and 65b are fixed, the force (compressive force, for example) between them can be exchanged.

Next, a case in which the shield machine constructed as described above is applied to implement the shield tunnel lining method according to the present invention will be described in the order of steps with reference to FIGS.

(I) Assembly of Reinforcing Bar and Form As shown in FIG. 4, with the propulsion jack 13 pulled,
Inside the inner cylinder 21, while assembling the reinforcing bar U,
Inside the rebar U, for example, an erector is used to form 1
Is assembled into a cylinder. On the other hand, the main gable frame 50 that closes the gap between the inner cylinder 21 and the mold 1 together with the assembly of the reinforcing bar U is set so that the outer end 50c thereof contacts the inner surface of the inner cylinder 21,
A ring-shaped storage groove 1d formed on the outer surface of the mold 1 with a gap between the inner end 50b of the main gable frame 50 and the outer surface of the mold 1 being formed.
The auxiliary wife frame 51 is protruded from the outside and closed. Specifically, the bolts 63a and 63b are moved in advance in a direction in which they are separated from the auxiliary end frame 51, and the auxiliary end frame 51 is allowed to move in the radial direction of the shield machine.
1 is moved outward, and as shown in FIG. 8, the groove 51b at the outer peripheral end is fitted to the inner end of the main gable frame 50. At this time, as shown in the left half of FIG. 5 and FIG.
The overlapping portions of the end portions 51a in the circumferential direction of the are reduced, and the end portion 51a and the ring-shaped storage groove 1 of the formwork are reduced.
A gap 62 is formed between the inner surfaces of d. Therefore, when the lining material is press-fitted into the rebar assembly chamber R, which is a post-process, there is a possibility that the lining material may leak from the gap 62.

However, here, the bag-shaped seal member 61 is inserted and set in the seal member storage recess 60 formed in the side wall portion 1e forming the ring-shaped storage groove 1d of the formwork 1. By injecting a fluid such as air or water into the member 61 by a fluid injecting means (not shown), the seal member 61 can be bulged so as to contact the auxiliary end frame 51. Then, as shown in FIGS. 11 and 12, the bulging seal member 61 closes the gap 62 between the auxiliary end frame 51 and the seal member storage recess 60. Therefore, the lining material does not leak from the gap 62 when the lining material is press-fitted into the rebar assembly chamber R, which is a post-process.

Further, in order to counter the pressure of the lining material, the rebar U is connected to the main gable frame 50 by the number of nuts J required for a separator, and the rebar U is attached to the main gable frame 50. Be prepared to bear such pressure.

At this time, the propelling jack 13 is attached to the form 1
Extend until it touches, and set in the frame 1 so that the reaction force of the propulsion jack 13 can be taken.

In order to improve the workability at the time of assembling, it is preferable that the tip of the reinforcing bar U is stopped by a locking metal fitting 55 provided on the inner surface of the inner cylinder 21, and the main girder frame 50 and the reinforcing bar U. It is preferable that the and are integrated in a factory or the like because the assembling workability can be increased.

The reinforcing bar U used as the separator is used.
Is connected by butting the joint metal J in the middle, but as the joint metal J, a parallel joint for fixing a part of the reinforcing bar U in a wrapped state, welding, or other connecting means can be used. Furthermore, except for the reinforcing bar which also serves as a separator, they shall be joined by lap joints.

In addition, since the ring-shaped storage groove 1d for storing the auxiliary gable frame 51 is formed for each ring in the mold 1, it becomes difficult to transmit stress between the molds 1, There is a risk that the strength of the entire formwork 1 will decrease. Here, after the auxiliary end frame 51 is set to the outer regular position as described above, the groove at the tip of the rod 67b is set to the bolt 63.
The protrusions 67a formed on the outer circumferences of the a and 63b are engaged, and the bolts 63a and 63b are rotated through the rod 67b so that the tips of the respective bolts 63a and 63b are attached to the auxiliary end frame 5.
1 is contacted (see FIG. 13).

(Ii) Placing of concrete into the rebar assembly room After the rebar U, the formwork 1, the main gable frame 50, the auxiliary gable frame 51, etc. have been set, the joint part 1 of the formwork 1 is passed through the placing pipe 2.
As shown in FIG. 16, a lining material (for example, concrete) C is cast from c into the rebar assembly chamber R surrounded by the inner cylinder 21, the end frames 50 and 51, and the formwork 1.

At this time, the rebar assembly room R has a high pressure,
As described above, the auxiliary wife frame 51 and the recess 6 for storing the seal member are provided.
The gap 62, which tends to occur between 0 and 0, is closed in advance by the seal member 61 in which a fluid such as air or water is injected, so that the lining material does not leak from this portion.

Further, the mold 1 is provided with bolts 63a and 63b on both sides thereof so as to sandwich the auxiliary end frame 51, and the bolts 63a and 63b are supported by reaction force receiving ribs 65a and 65b. When a compressive force acts on one mold 1 at the time of injecting the lining material, the compressive force is applied to the reaction force receiving ribs 65a, the bolts 63a, the auxiliary end frame 5
1, through the holt 63b and the pressure receiving rib 65b, and is transmitted to the entire form 1 in a well-balanced manner so as to straddle the ring-shaped storage groove 1d. Therefore, the ring-shaped storage groove 1d
By providing the above, it is possible to solve the problem that the strength of the mold 1 is insufficient.

As shown in FIG. 17, when the concrete pressure Pr in the reinforcing bar assembly room R becomes substantially the same as the pressure Po of the existing concrete after the completion of pouring the concrete into the reinforcing bar assembly room R, Auxiliary wife frame 5 at the rear of the assembly room R
As shown in the right half of FIG. 5 and FIG. 18, 1 is moved inward of the mold 1 to close the filling port of the joint portion 1c. By this operation, the pressure of the placed concrete is always maintained. When the auxiliary gable frame 51 is moved inward of the form 1 to be in the disassembled state as described above,
As described above, insert the groove at the tip of the rod 67b into the bolt 63
The bolts 63a and 63b are rotated through the rod 67b by engaging with the protrusions 67a on the outer circumferences of the a and 63b, and the tips of the bolts 63a and 63b are separated from the auxiliary end frame 51 in advance.

When pouring concrete from the pipe 2 as described above, the pushing piston 24 receives a force in the direction against the pressing force of the pressure holding jack 25 due to the supply pressure of the concrete, but pushes the pushing piston 24. Since the pressure holding jack 25 is provided with a relief valve that allows the jack to contract when it receives a pressure greater than the set pressure, the pushing piston 24 is made of concrete as shown by the arrow in FIG. It moves to the front of the shield machine 10 along with the supply, and the concrete pouring is not hindered. Further, when the supply of concrete is stopped, the pressing force of the pressure holding jack 25 acts on the pushing piston 24 again, and moves backward as the shield machine 10 advances.

(Iii) Preparation for pouring When carrying out concrete pouring to the outside, the pushing pressure of the pressure-holding jack 25 is made to correspond to the difference in the natural pressure depending on the height, and the concrete poured is always the natural rock. The size is set so that a pressure larger than the pressure can be applied, the driving pipe 30 is connected to the joint portion 27 of the extrusion piston 24, and the concrete piston chamber 2 is passed through the filling port 24a of the extrusion piston 24.
Set inside 3 so that the lining material can be supplied. Also, delay type concrete or the like is applied as the lining material, and the pressure is set to be transmitted to the rear.

Needless to say, the concrete piston chamber 23 is manufactured with high precision in a factory in advance and the seal member 26 is formed to withstand high pressure.

(Iv) Placing of concrete into the concrete piston chamber After preparation for placing concrete is completed, concrete is sent from the supply pump 31 to the placing pump 30, and the placing pump 3
Concrete is poured into the concrete piston chamber 23 from the filling port 24a of the extrusion piston 24 through 0.

More specifically, the extrusion piston 24 provided in the concrete piston chamber 23 of the shield machine 10
By adjusting the pressing force of the pressure holding jack 25 of the concrete, the concrete pressure Po generated by the action of the pushing piston 24
Is kept higher than the ground pressure Pj, and the casting pipe 3
Concrete is supplied to the concrete piston chamber 23 at a pressure greater than 0 at a pressure higher than the pressure of the pressure holding jack 25, and the concrete is placed in the concrete piston chamber 23.

At this time (when concrete is placed in the concrete piston chamber 23), the pushing piston 24
Is subjected to a force in the direction against the pressing force of the pressure holding jack 25 due to the supply pressure of the concrete, but the pressure holding jack 25 for pressing the pushing piston 24 receives the pressure larger than the set pressure. Since there is a relief valve that shrinks the
No. 4 moves to the front of the shield machine 10 along with the supply of concrete, so that the placing of concrete is not hindered. When the supply of concrete is stopped, the pressing force of the pressure holding jack 25 acts on the pushing piston 24 again,
As the shield machine 10 advances, it will move backward.

(V) Excavation of the shield machine Next, while pushing the concrete in the concrete piston chamber 23 backward, excavate the natural ground with the cutter device 12 at the front end of the skin plate 11, and propel it with a reaction force on the formwork 1. The shield machine 10 is advanced by driving the jack 13. At this time, the concrete pressure Po is equal to the natural pressure Pj.
Since it is larger, there is no need to worry about water leakage.

After the completion of the excavation, the first propulsion jack 13 is retracted,
Reinforcing bars, formwork, etc. are set according to the procedure described above, and the work is advanced by repeating such steps. In addition,
It goes without saying that the pressure inside the concrete piston chamber 23 is kept constant by the pressure holding jack 25 even after the completion of the excavation.

If the sealing member 26 of the extrusion piston 24 needs to be replaced during the above process, the extrusion piston 24 can be removed from the concrete piston chamber 23 after the hardening of the concrete and the sealing member 26 can be replaced. Good. This work is a simple work of extracting the push-out piston 24 using the pressure holding jack 25 after hardening the concrete and replacing the seal member 26 on the outer periphery thereof. Also, since the replacement work is carried out after hardening the concrete, it can be safely performed on site. Can be done. When the concrete pipe needs to be cleaned, the filling mechanism 24a may be closed by using the shutoff mechanism 28 attached to the pushing piston 24, and the driving pipe 30 may be removed and cleaned. This work can be prevented by the shut-off mechanism 28 from flowing out of the concrete from the filling hole, so that it can be performed while the concrete in the concrete piston chamber 23 is being pressurized, and workability during tunnel lining is improved. It is not damaged.

In the above embodiment, the tail portion of the shield machine 10 is doubled, a plurality of concrete piston chambers 23 are provided therein, and the pushing piston 24 is provided in the concrete piston chamber 23, and the pushing piston 24 is provided. Since the pressure in each concrete piston chamber 23 is adjusted by the pressure holding jack 25, the pressure of the concrete in each chamber responds to the change in the ground pressure (usually, the deeper the depth, the higher the pressure). Can be controlled individually, and the concrete pressure can always be kept higher than the ground pressure reliably and easily.

Further, in the embodiment, the concrete piston chamber 23 is provided in the tail portion of the shield machine, and the extruding piston 24 is slidably arranged in the concrete piston chamber 23 in the factory in a sealed state. The accuracy of the seal portion of the piston 24 can be maintained at the same level as the seal of the movable portion such as the cutter of the shield machine, and almost all the ground that the shield machine can support can be supported.

Further, in the embodiment, since it is possible to safely and easily exchange the seal important for maintaining the pressure of the concrete, the seal can be exchanged even during long-distance excavation so that the concrete pressure can be constantly maintained. It has the advantage that it can be held. Further, since the pushing piston 24 is moved forward with the supply of concrete and is moved to the rear of the shield machine when pushing out the concrete, the pressure in the concrete piston chamber is kept substantially constant even when the concrete is supplied. It is possible to keep it, and as a result, it does not exert excessive pressure on the ground and the formwork, does not push up the ground, and does not need to make the form more robust than necessary. .

Further, as described above, since the pressure in the concrete piston chamber 23 can be always kept higher than the earth pressure and the water pressure of the natural ground, there is no water leakage, and high-strength, high-quality concrete is poured. There is also an advantage that there is no possibility of ground subsidence because the tail voids can be reliably filled.

Further, in the embodiment, since the pushing piston 24 is configured to constantly press the concrete, it is possible to use the concrete having a long curing time, and it is not necessary to clean the pipe or the like for each ring. There is also the effect of becoming.

Further, in the embodiment, since the reinforcing bar U is attached to the end frame to be used also as the separator, the end frame does not need to be jacked, and even when the end frame is provided with a jack, it can be removed as necessary. There is an advantage that it becomes possible.

Further, the space between the inner cylinder 21 and the mold 1 is closed by the main gable frame 50 and the auxiliary gable frame 51 joined to the main gable frame 50, and the appearance of the auxiliary gable frame 51 is adjusted to shield the shield. Since the meandering of the machine is adjusted, there is an advantage that workability can be improved.

[0067]

As described above, according to the present invention, the following excellent effects can be obtained.

According to the method of covering shield tunnels according to the first aspect of the present invention, the pressures of the pushing pistons in the plurality of concrete piston chambers formed in the tail portion are individually controlled by the pressure holding jacks to cover each chamber. Since the pressure of the work material can be controlled individually, it is possible to easily deal with the difference in the ground pressure depending on the height, and the pressure of the lining material is always kept higher than the earth pressure and water pressure of the ground. It will be possible. Further, due to such an action, the tail void is reliably filled with the lining material, and the risk of sinking is eliminated.

Further, when the reinforcing bars are assembled, the main gable frame is placed in contact with the inner surface of the inner cylinder of the shield machine, and the gap between the inner end of the main gable frame and the outer surface of the form is made into the form frame. Since the ring-shaped storage groove formed on the outer surface is overlapped with each other in the circumferential direction, the plurality of arc-shaped auxiliary wife frames formed in a ring shape as a whole are closed by being projected outward. After placing the lining material in the rebar assembly room, when moving the auxiliary gable frame inward, the auxiliary gable frame is inwardly expanded by taking a large overlap between the circumferential end portions of the auxiliary gable frame. It is very easy to move to.

Further, a space between the overlapping portions of the circumferential end portions of the arc-shaped auxiliary gable frame and the ring-shaped storage groove on the outer surface of the form is sealed by a seal member interposed therebetween. Therefore, when placing the lining material in the rebar assembly chamber, it is possible to satisfactorily seal the overlapping portion of the circumferential end portions of the auxiliary gable frame, which is the place where the lining material leaks most easily. The leakage of lining material can be prevented.

According to the gable frame structure of the shield machine of claim 2, a ring-shaped main gable frame is set so that the outer end is in contact with the inner surface of the inner cylinder, and the inner end and the form of the main gable frame. The outer circumferential surface of the mold is overlapped with the outer circumferential surface of the mold so that the circumferential end portions of the molds are overlapped with each other to form a ring shape and project outward from a ring-shaped storage groove formed on the outer surface of the mold. A plurality of arc-shaped auxiliary gable frames, and a seal member accommodating recess provided in the ring-shaped accommodating groove of the mold so as to face the overlapping portion of the circumferential end portions of the auxiliary girdle. Since the seal member is accommodated in the seal member accommodating recess, the construction method according to claim 1 can be suitably implemented.

According to the third aspect of the present invention, since the auxiliary end frame is sandwiched between the bolts provided on both sides of the auxiliary end frame and the bolts are supported by the reaction force receiving ribs, the compressive force is applied to the form. When added, the bolts, auxiliary gables, and reaction force receiving ribs receive the compressive force applied to the entire form, and form a ring-shaped storage groove for accommodating the auxiliary gables in the form. It is possible to prevent the strength from being deteriorated.

According to the fourth aspect of the invention, since the bolt rotating means for rotating the bolt is connected to the bolt, the bolt can be rotated and moved in the axial direction of the bolt. It is extremely easy to bring the tip into contact with or separate from the auxiliary gable frame.

According to a fifth aspect of the present invention, the mold is provided with a thrust transmitting portion that extends from one end to the other end of the mold so as to straddle the ring-shaped storage groove, and the thrust transmitting portion has a reaction force receiving rib. Since it is fixed, it is possible to firmly support the reaction force receiving rib, which tends to receive an excessive force, and to further increase the strength of the form.

[Brief description of drawings]

FIG. 1 is a side sectional view of a tunnel showing a state in which a shield machine is excavating a natural ground in a method for lining a shield tunnel of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a sectional view taken along the line BB in FIG.

FIG. 4 is a cross-sectional view showing details of the end frame structure of the shield machine of the present invention.

FIG. 5 is a front view of an auxiliary wife frame.

6 is a cross-sectional view taken along the line CC of FIG.

7 is a cross-sectional view taken along the line DD of FIG.

FIG. 8 is a cross-sectional view showing a state where the central portion of the auxiliary gable frame is housed in a ring-shaped housing groove of the formwork.

FIG. 9 is a cross-sectional view showing a state where the circumferential end portion of the auxiliary gable frame is housed in a ring-shaped housing groove of the formwork.

10 is a cross-sectional view taken along the line EE of FIG.

FIG. 11 is a cross-sectional view showing a state in which a space between a circumferential end portion of the auxiliary gable frame and a ring-shaped storage groove of the form is sealed by a seal member.

12 is a cross-sectional view taken along the line FF of FIG.

FIG. 13 is a cross-sectional view showing the relationship between the auxiliary gable frame and the bolt.

FIG. 14 is a front view showing a relationship between an auxiliary gable frame and bolts.

FIG. 15 is a cross-sectional view taken along the line GG in FIG.

FIG. 16 is a process chart shown for specifically explaining the method of the present invention.

FIG. 17 is a process chart shown for specifically explaining the method of the present invention.

FIG. 18 is a process chart shown for specifically explaining the method of the present invention.

[Explanation of symbols]

 T Tunnel 1 Form 1d Ring-shaped storage groove 1e Side wall 10 Shielding machine 11 Skin plate 12 Cutter device 13 Propulsion jack 22 Partition wall 23 Concrete piston chamber 24 Extrusion piston 25 Pressure holding jack 50 Main gable frame 51 Auxiliary gland frame 51a End part 60 Sealing member storage recessed portion 61 Bag-shaped sealing member 62 Gap 63a, 63b Pressure receiving rib 66 Female screw portion 67 Bolt rotating means 67a Protrusion 67b Rod 68 Thrust transmission portion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Fusao Kawakami, 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Hiroyuki Kawaguchi, 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Hidetake Ishizaki 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Tayoshi Arato 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Masayuki Otsuka 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Shinji Seki 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd.

Claims (5)

[Claims] 1. A peripheral wall of a tunnel excavated while excavating the ground by a cutter device at the tip of a shield machine is covered with a form at a predetermined interval, and a reinforcing bar is arranged between the form and the peripheral wall. A lining method for a shield tunnel in which the lining material is supplied to cover the inner surface of the tunnel, and the tail portion of the skin plate of the shield machine is double formed by the outer cylinder and the inner cylinder. , A plurality of partition walls extending in the radial direction of the skin plate are formed between the outer cylinder and the inner cylinder of the tail portion to provide a plurality of concrete piston chambers for accommodating the pushing pistons, and the reinforcing bars are arranged inside the inner cylinder. Then, when assembling the formwork inside the rebar, set the ring-shaped main gable frame that closes the gap between the inner cylinder and the formwork with the arrangement of the rebar so that the outer end contacts the inner surface of the inner cylinder. Then In addition, the concrete pressure applied to the main gable frame is also received as a separator instead of connecting the reinforcing bars, and the gap between the inner end of the main gable frame and the outer surface of the form is a ring shape formed on the outer surface of the form. From the storage groove of the circular auxiliary auxiliary frame by overlapping outwardly the circumferential ends of each other and projecting outwardly a plurality of circular auxiliary auxiliary frames formed in a ring shape as a whole. After the space between the overlapping portions of the direction end portions and the ring-shaped storage groove on the outer surface of the formwork is sealed by the seal member interposed therebetween, the inner cylinder, the formwork, the main gable frame and the auxiliary The lining material is placed in the rebar assembly chamber surrounded by the end frame, while the lining material is placed between the concrete piston chamber and the mold and the ground to cover the rebar assembly chamber. The pressure of the work material is equal to the pressure of the existing lining material At this point, the seal by the seal member is released, and the auxiliary girder frame on the rear side in the traveling direction is moved inward along the ring-shaped storage groove of the formwork so that the lining material and the existing lining material in the rebar assembly chamber Is integrated, and the shield machine is pushed forward while pressing the pushing piston in the concrete piston chamber by the pressure holding jack so that the pressure of the lining material is higher than the earth pressure and the water pressure of the natural ground. A method for lining a shield tunnel, which comprises digging a shield machine. 2. A gable frame structure of a shield machine for blocking between an inner cylinder forming a concrete piston chamber of a tail portion of a skin plate of the shield machine and a formwork covering a peripheral wall of a tunnel excavated by the shield machine. A ring-shaped main gable frame that is set so that its outer end is in contact with the inner surface of the inner cylinder, and the inner end of the main gable frame and the outer surface of the form, so that both sides are closed. A plurality of arc-shaped auxiliary wife frames which are formed by stacking the end portions in the direction of each other and are formed into a ring shape as a whole, and which are projected outward from a ring-shaped storage groove formed on the outer surface of the form frame; A recess for storing a seal member, which is provided in the ring-shaped storage groove so as to face the overlapping portion of the circumferential end portions of the auxiliary corrugated frame, and the auxiliary corrugated frame which is stored in the concave recess for the seal member storage Overlapping part of the circumferential ends of Wife frame structure of the shield machine, characterized by comprising a seal member for sealing between. 3. The gable frame structure for a shield machine according to claim 2, wherein bolts are provided on both sides of the auxiliary gutter frame in the seal groove of the form in the same axial line shape. Is a gable frame structure of the shield machine, each of which is supported by a reaction force receiving rib. 4. The endless frame structure for a shield machine according to claim 3, wherein the bolt is connected to a bolt rotating means for rotating the bolt. 5. The endless frame structure for a shield machine according to claim 4, wherein the formwork is provided with a thrust transmitting portion that extends from one end to the other end of the formwork so as to straddle a ring-shaped storage groove, and The end frame of the shield machine, wherein the reaction force receiving rib is fixed to the thrust transmitting portion.