JP3309304B2 - Method of lining shield tunnel and frame structure of shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for lining a shield tunnel, and more particularly to a method for lining a shield tunnel using a lining material such as cast-in-place concrete. TECHNICAL FIELD The present invention relates to a construction method and a frame structure of a shield machine used directly for implementing the shield tunnel lining method.

[0002]

2. Description of the Related Art As a method for lining a shield tunnel, the present applicant has proposed a method disclosed in Japanese Patent Application No. 2-283643 (Japanese Patent Application Laid-Open No. 4-161598).

[0003] In other words, this type uses a shield machine having a cylindrical outer shape, and while excavating the ground with a cutter device provided in front of the shield machine, forms a peripheral wall of a dug tunnel at a predetermined interval. It is covered with a frame, a reinforcing bar is arranged between the form and the peripheral wall, concrete is poured between the form and the peripheral wall, and the shield machine is sequentially advanced.

[0004] Specifically, a tail portion of the skin plate of the shield machine is formed by an outer cylinder and an inner cylinder, and a radius of the skin plate is defined between the outer cylinder and the inner cylinder of the tail section. A plurality of concrete piston chambers for accommodating the extrusion piston by forming a plurality of partition walls extending in the direction are formed.

When a reinforcing bar is arranged inside the inner tube and a formwork is assembled inside the reinforcing bar, a main wife frame which closes the inner tube and the formwork together with the reinforcing bar is disposed, and an outer end thereof is formed. While being set so as to be in contact with the inner surface of the inner cylinder, the concrete pressure applied to the end frame is received as a substitute for the separator by connecting the reinforcing bars, and the gap between the inner end of the main end frame and the outer surface of the formwork is After projecting and closing the auxiliary wive frame from the outside of the formwork, the lining material is poured into the rebar assembly room surrounded by the inner cylinder, the formwork and the wive frame, while the concrete piston A lining material is cast between the ridges, and at the time when the pressure of the lining material in the reinforcing bar assembly room is equal to the pressure of the existing lining material, the rear auxiliary frame is moved inward to remove the reinforcing material in the reinforcing bar assembly room. Lining material and existing lining material are integrated. Switching so as to supply the lining material from the Topisuton chamber only.

[0006] Then, the extruding piston in the concrete piston chamber is pressed by the pressure holding jack so that the pressure of the lining material becomes higher than the earth pressure and the water pressure of the ground, and the shield machine is excavated.

[0007]

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

That is, in the above lining method, the gap between the inner end of the main wife frame and the outer surface of the mold is closed by projecting the auxiliary wife frame from the inside of the mold, and then the inner cylinder and the mold are closed. The lining material is poured into the reinforcing bar assembly room surrounded by the wife frame, and at the time when the pressure of the lining material in the reinforcing bar assembly room is equal to the pressure of the existing lining material, the rear auxiliary wife frame is moved inward. It is indispensable technology to integrate the lining material in the reinforcing bar assembly room with the existing lining material, but how to move the auxiliary wive frame inward, or how to move the auxiliary wive frame and the formwork No specific technology is disclosed as to how to perform the sealing between the two.

The auxiliary wive frame performs a particularly important function in ensuring the sealing performance of the rebar assembly room surrounded by the inner cylinder, the formwork, and the wive frame during the meandering operation of the shield machine. Efficiently moving the frame inward and enhancing the sealing property between the auxiliary wife frame and the formwork are important in implementing the shield tunnel lining method.

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above circumstances, and has as its object to improve the sealing performance between the auxiliary wive frame and the formwork and to efficiently move the auxiliary wive frame inward. It is an object of the present invention to provide a method for lining a shield tunnel and a frame structure of a shield machine, which can enhance workability during construction.

[0011]

In order to achieve the above object, according to the first aspect of the present invention, while excavating the ground with a cutter device at the tip of a shield machine, the peripheral wall of the excavated tunnel is spaced at a predetermined interval. A method of covering a shield tunnel, comprising covering with a formwork, arranging a reinforcing bar between the formwork and the peripheral wall, supplying a lining material, and lining an inner surface of the tunnel. The tail part of the plate is formed as a double part 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 part to accommodate the extruded piston. A plurality of concrete piston chambers are provided, a reinforcing bar is arranged inside the inner cylinder, and when assembling the formwork inside the reinforcing bar, a ring that closes between the inner cylinder and the formwork together with the arrangement of the reinforcing bars. Of the main wife frame, the outer end thereof is set so as to be in contact with the inner surface of the inner cylinder, and the concrete pressure applied to the main wife frame is received as a substitute for a separator by connecting a reinforcing bar, and the inner end of the main wife frame is A plurality of arc-shaped auxiliary wives formed in such a manner that a gap between the outer surface of the mold and a ring-shaped storage groove formed on the outer surface of the mold is overlapped with each other in the circumferential direction to form a ring as a whole. The frame is closed by protruding outward, and a space is provided between the overlapped portion between the circumferential ends of the arc-shaped auxiliary wive frame and the ring-shaped storage groove on the outer surface of the formwork. After sealing with the sealing member made, the lining material is poured into the reinforcing assembly room surrounded by the inner frame, the formwork, the main frame and the auxiliary frame, and the concrete piston chamber is used to form the formwork. Placing lining material between ground and ground When the pressure of the lining material in the rebar assembly chamber is equal to the pressure of the existing lining material, the seal by the seal member is released, and the auxiliary wand frame on the rear side in the traveling direction is formed into a ring-shaped storage groove of the formwork. To move the extruding piston in the concrete piston chamber by the pressure holding jack to move the lining material inside the reinforcing bar assembly room and the existing lining material. The shield machine is excavated while being pressed to a pressure higher than the water pressure.

According to the second aspect of the present invention, a shield for closing a space between an inner cylinder forming a concrete piston chamber in a tail portion of a skin plate of a shield machine and a formwork covering a peripheral wall of a tunnel excavated by the shield machine. A wedge frame structure of the machine, wherein a ring-shaped main wedge frame is set so that an outer end thereof is in contact with an inner surface of the inner cylinder, and both are closed between an inner end of the main wive frame and an outer surface of the formwork. As described above, a plurality of arc-shaped auxiliary wives are formed so that their circumferential ends are overlapped with each other, formed as a ring as a whole, and projected outward from a ring-shaped storage groove formed on the outer surface of the formwork. A frame, a sealing member storage recess provided in a ring-shaped storage groove of the mold so as to face a superposed portion of circumferential ends of the auxiliary wive frame, and a sealing member storage recess. The circumferential end of the auxiliary wive 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 on both sides of the seal groove of the mold frame with the auxiliary wedge frame interposed therebetween, and the bolts are respectively formed by reaction force receiving ribs. It is characterized by being supported.

According to a fourth aspect of the present invention, there is provided the end frame structure of the shield machine, wherein the bolt is provided with a bolt rotating means for rotating the bolt.

In the invention according to claim 5, the formwork includes:
A thrust transmitting portion extending from one end to the other end of the form 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 pressures of the extruding pistons in the plurality of concrete piston chambers formed in the tail portions are individually controlled by the pressure holding jacks, so that the lining material in each chamber is controlled. Pressure can be controlled individually, making it easy to respond to differences in ground pressure due to height, and keeping the pressure of the lining material always higher than the earth pressure and water pressure of the ground. Will be possible. Further, by such an operation, the tail void is reliably filled with the lining material, and there is no possibility of sinking.

Further, when assembling the rebar, a main wife frame is disposed in contact with the inner surface of the inner cylinder of the shield machine, and a gap between the inner end of the main wife frame and the outer surface of the mold frame is formed by This is because a plurality of arc-shaped auxiliary wive frames formed in a ring shape as a whole are overlapped with each other in the circumferential direction from the ring-shaped storage groove formed on the outer surface and are closed by projecting outward. After placing the lining material in the rebar assembling room and moving the auxiliary wive frame inward, the auxiliary wive frame should be Easy to move to.

[0018] Further, the space between the overlapping portions of the arc-shaped auxiliary wive frames in the circumferential direction and the ring-shaped storage groove on the outer surface of the formwork is sealed by a seal member interposed therebetween. Therefore, when the lining material is poured into the rebar assembling room, it is possible to satisfactorily seal the overlapped portion between the circumferential end portions of the auxiliary wive frame, which is the location where the lining material leaks most easily. .

When the supply pressure of the lining material is higher than the set holding pressure of the pressure holding jack, and when the supply pressure of the lining material is higher than the set pressure of the lining material, the extruding is performed by the supply pressure of the lining material. Since the piston is configured to move to the front of the shield machine, the extruding piston moves to the rear of the shield machine when extruding the lining material, and moves forward when putting the lining material into the piston chamber, and moves to the concrete piston chamber. Can be kept substantially 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 a face of a tunnel in the middle of construction according to the method of the present invention. In FIG.
Reference numeral 0 denotes a shield machine. The shield machine 10 is configured such that a cutter device 12 provided at a front portion of the shield machine 10 excavates a tunnel T to the left with respect to the plane of the drawing, and a peripheral wall of the tunnel T formed behind the shield machine 10. Is covered with a form 1 at a predetermined interval, and a reinforcing bar U is provided between the form 1 and the peripheral wall.
Is arranged, a lining material is supplied, and a lining wall W is constructed on the inner surface of the tunnel. The mold 1 is mainly composed of a face plate 1a and a support frame 1b that supports the face plate 1a. Further, the face plate 1a of some of the molds (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, and a ring-shaped storage groove 1d for accommodating an auxiliary wife frame 51 to be described later is provided. 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 is rotated by a cylindrical skin plate 11 forming an outer shell and a driving means (not shown) provided at the front end of the skin plate 11. Cutter device 12 for excavating the ground, and skin plate 11
And a propulsion jack 13 having a base end connected to a partition plate 11a formed inside the housing.

The tail portion of the skin plate 11 is formed by an outer cylinder 20 having the same diameter as the skin plate 11 and constituting 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. A plurality (four in the illustrated example) of concrete piston chambers 23 are provided between the outer cylinder 20 and the inner cylinder 21, and an extruding piston 24 is slidably housed in each concrete piston chamber 23. .

As shown in detail in FIGS. 2 to 4, the pushing piston 24 is formed in such a size as to fit tightly in the concrete piston chamber 23 in accordance with the internal shape of the concrete piston chamber 23. It is configured to slide back and forth by a plurality of pressure holding jacks 25 whose base ends are attached to the plate 11a.

The pressure holding jack 25 for operating the push-out piston 24 is provided with a relief valve so that the jack shrinks when the driving pressure of the lining material becomes larger than the holding pressure of the jack. Configuration.

A plurality of (two in this embodiment) seal members 26 are attached to the outer periphery of the push-out piston 24, and the inside of the skin plate 11 and the inside of the concrete piston chamber 23 are provided at the center of the push-out piston 24. And a filling hole 24a made of a lining material communicating with the inner surface of the pushing piston 24.
A joint 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 provided at the center of the push-out piston 24. However, the present invention is not limited to this embodiment.

The filling hole 24a has a filling hole 24a.
A shut-off mechanism 28 for opening and closing a is provided (see FIG. 4), so that the filling hole 24a can be opened and closed as needed. Note that, specifically, this blocking mechanism 28
It consists of a shutter, a valve, etc.
Other configurations may be used as long as they can open and close 4a.

In FIG. 1, reference numeral 30 denotes a casting pipe for the lining material. The casting pipe 30 is a branch valve 33 connected to a supply pipe 32 of a supply pump 31 for the lining material.
The driving pipe itself is constituted by 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 denotes a main wife frame which closes between the inner cylinder 21 and the mold frame 1. As shown in FIG. The basic configuration is such that a plurality of plate bodies 50a curved corresponding to the curvature of the inner surface of the inner surface 21 are combined in a ring shape in the longitudinal direction.

Further, an inner end 50b of the main wife frame 50 is provided.
Is processed so as to be concentric with its outer end,
Further, since the size of the gap G (see FIG. 1) between the inner end 50b and the outer periphery of the mold 1 changes due to the meandering of the shield machine, the size of the gap is set to be larger than the meandering amount. Care is taken so that the frame 50 is not exposed inside the mold 1.

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

The auxiliary wife frame 51 is basically the same as the main wife frame 50, and is made of an arc-shaped member curved in accordance with the curvature of the inner surface of the main wife frame 50 as shown in FIG. Things. That is, as shown in FIGS. 5 to 7, the auxiliary end frame 51 is overlapped with each other in the circumferential direction end portions 51 a which are set to about half of the original thickness, thereby forming the entirety. As a ring. The left half in FIG. 5 shows a set state in which the outer end of each auxiliary wife frame 51 has been moved outward so as to abut against the inner end of the main wife frame 50, and the right half in FIG. The disassembled state in which the frame 51 is moved inward and housed inside the mold 1 is shown.

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

As shown in FIGS. 9 to 12, the side wall portion 1e constituting the ring-shaped storage groove 1d of the mold frame 1 is opposed to the overlapping portion of the circumferential end portions of the auxiliary wive frame 51. In addition, a seal member housing recess 60 is formed by recessing a part of the side wall 1e. A bag-shaped seal member 61 is inserted and set in the seal member storage recess 60. When a fluid such as air or water is introduced into the seal member 61, the seal member 61 comes into contact with the auxiliary wife frame 51. As a result, the gap 62 between the auxiliary wife frame 51 and the seal member storage recess 60 is closed (see FIGS. 11 and 12).

As shown in FIG. 13, bolts 6 are provided on both sides of the auxiliary frame 51 with the auxiliary frame 51 interposed therebetween.
3a and 63b are arranged so as to be coaxial with each other. These bolts 63a and 63b penetrate holes 1ee formed in the side wall 1e constituting the ring-shaped storage groove 1d, and receive a screw portion formed on the outer periphery thereof in a reaction force receiving portion provided inside the formwork 1. Female thread 66 of ribs 65a, 65b
And screwed to it.

The bolts 63a and 63b have bolts 6
Bolt rotating means 67 for rotating 3a, 63b is provided continuously. For example, as shown in FIG. 15, the bolt rotating means 67 includes projections 67a provided on the outer circumferences of the bolts 63a and 63b at intervals of 90 degrees, and a rotating groove in which the leading end grooves are engaged with these projections 67a. An operator or the like grasps the rod 67b as necessary, and the tip of the rod 67b is engaged with the projection 67a to
By rotating the bolts 63a and 63b through b,
The bolts 63 a and 63 b can be moved in a direction to approach or separate from the auxiliary wife frame 51.

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

Next, a case where the shield tunnel lining method according to the present invention is carried out by applying the shield machine configured as described above will be described in the order of steps with reference to FIGS.

(I) Assembling of Rebar and Formwork As shown in FIG. 4, with the propulsion jack 13 pulled,
While assembling the rebar U inside the inner cylinder 21,
Form 1 is formed on the inside of this reinforcing bar U by using, for example, an erector.
Is assembled into a cylindrical shape. On the other hand, the main wive frame 50 that closes the space between the inner cylinder 21 and the mold 1 together with the assembly of the rebar U is set so that the outer end 50c thereof is in contact with the inner surface of the inner cylinder 21;
A gap between the inner end 50b of the main wife frame 50 and the outer surface of the mold 1 is formed in a ring-shaped storage groove 1d formed on the outer surface of the mold 1.
And make the auxiliary wife frame 51 project outward and close it. Specifically, the bolts 63a and 63b are moved in advance in a direction away from the auxiliary wife frame 51, and the auxiliary wife frame 51 is set in a state where the shield machine is allowed to move in the radial direction of the shield machine.
8, the groove 51b on the outer peripheral end is fitted to the inner end of the main frame 50 as shown in FIG. At this time, as shown in the left half of FIG. 5 and FIG.
The overlapped portion of the circumferential end portions 51a is reduced, and this end portion 51a and the ring-shaped storage groove 1 of the formwork are reduced.
A gap 62 occurs between the inner surfaces of d. Therefore, when the lining material is press-fitted into the rebar assembling room R in a later step, 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 constituting the ring-shaped storage groove 1d of the mold frame 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 swelled so as to abut the auxiliary end frame 51. Then, as shown in FIGS. 11 and 12, the swelled seal member 61 closes the gap 62 between the auxiliary wife 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 assembling chamber R in a later step.

Further, in order to resist the pressure of the lining material, a necessary number of reinforcing bars U are connected to the main wife frame 50 via a nut J as a separator. The pressure should be provided.

At this time, the propulsion jack 13 is connected to the mold 1
, And set so that the reaction force of the propulsion jack 13 can be removed from the formwork 1.

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 55 provided on the inner surface of the inner cylinder 21. It is preferable to integrate them in a factory or the like, because the assembling workability can be increased.

The reinforcing bar U used as the separator
Are connected by joining them in the middle with a joint hardware J. As the joint hardware J, a parallel joint that fixes a part of the reinforcing bar U in a wrapped state, welding, or other connection means can be used. Furthermore, parts other than the rebar serving also as the separator are joined by a lap joint.

Further, since ring-shaped storage grooves 1d for accommodating the auxiliary wife frame 51 are formed for each ring in the mold 1, transmission of stress between the molds 1 becomes difficult. There is a possibility that the strength of the entire mold 1 is reduced. Here, after the auxiliary wife frame 51 is set at the outer regular position as described above, the groove at the tip of the rod 67 b is
a, 63b is engaged with a projection 67a formed on the outer periphery of the bolt 63a, and the bolts 63a, 63b are rotated through the rod 67b.
1 (see FIG. 13).

(Ii) Casting concrete into the reinforcing bar assembly room After the setting of the reinforcing bar U, the formwork 1, the main wife frame 50, and the auxiliary wife frame 51, etc., the joint portion 1 of the formwork 1 through the casting pipe 2.
As shown in FIG. 16, a lining material (for example, concrete) C is poured into the rebar assembling room R surrounded by the inner cylinder 21, the end frames 50 and 51, and the formwork 1.

At this time, the pressure in the rebar assembling chamber R becomes high.
As described above, the auxiliary wife frame 51 and the sealing member storage recess 6 are provided.
Since the gap 62, which tends to be formed between the inside and the outside, is previously closed by the seal member 61 into which a fluid such as air or water is injected, the lining material does not leak from this portion.

Further, the form frame 1 is provided with bolts 63a, 63b on both sides thereof so as to sandwich the auxiliary frame 51, and the bolts 63a, 63b are supported by reaction force receiving ribs 65a, 65b. When a compressive force is applied to one of the molds 1 during the injection of the lining material, the compressive force is applied to the reaction force receiving rib 65a, the bolt 63a,
1, through the holt 63b and the pressure receiving ribs 65b, is transmitted to the entire mold 1 in a well-balanced manner so as to straddle the ring-shaped storage groove 1d. Therefore, the ring-shaped storage groove 1d
The problem of insufficient strength of the formwork 1 can be solved by providing.

As shown in FIG. 17, after the concrete has been poured into the reinforcing bar assembly room R, when the pressure Pr of the concrete in the reinforcing bar assembly room R becomes substantially the same as the pressure Po of the existing concrete, the reinforcing bar is set. 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, and the filling port of the joint 1 c is closed. By this operation, the cast concrete is always kept at the pressure. As described above, when the auxiliary wife frame 51 is moved inward of the mold 1 to be in a disassembled state,
As described above, the groove at the tip of the rod 67b is
The bolts 63a and 63b are rotated through the rods 67b so that the tips of the bolts 63a and 63b are separated from the auxiliary wife frame 51 in advance.

When the concrete is poured from the pipe 2 as described above, the extruding piston 24 receives a force against the pressing force of the pressure holding jack 25 due to the supply pressure of the concrete. Since the pressure holding jack 25 is provided with a relief valve that shrinks when the jack receives a pressure greater than the set pressure, the pushing piston 24 is made of concrete as shown by an arrow in FIG. It moves to the front of the shield machine 10 with the supply, and does not hinder the placing of concrete. 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 Casting When carrying out concrete placement to the outside, the extruded pressure of the pressure holding jack 25 is made to correspond to the difference in the ground pressure depending on the height, and the poured concrete is always grounded. And the casting pipe 30 is connected to the joint 27 of the extrusion piston 24, and the concrete piston chamber 2 is passed through the filling port 24a of the extrusion piston 24.
3 is set so that a lining material can be supplied. In addition, delay type concrete or the like is applied as the lining material, and the pressure is set to be transmitted backward.

It goes without saying that the concrete piston chamber 23 is manufactured in advance in a factory with high precision, and the sealing member 26 is formed so as to withstand high pressure.

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

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

At this time (when concrete is poured into the concrete piston chamber 23), the extrusion piston 24
Receives a force in the direction opposite to the pressing force of the pressure holding jack 25 due to the supply pressure of the concrete, but the pressure holding jack 25 pressing the extrusion piston 24 receives the jack when receiving a pressure larger than the set pressure. Since the relief valve is provided so that the
4 moves forward of the shield machine 10 with the supply of the concrete, and the placing of the concrete is not hindered. When the supply of concrete stops, the pressing force of the pressure holding jack 25 acts on the pushing piston 24 again,
It will move rearward as the shield machine 10 advances.

(V) Excavation of the shield machine Next, while extruding the concrete in the concrete piston chamber 23 backward, the ground is excavated by the cutter device 12 at the front end of the skin plate 11, and the form 1 is propelled by taking a reaction force. The shield machine 10 is excavated by driving the jack 13. At this time, the concrete pressure Po becomes the ground pressure Pj.
Because it is larger than this, there is no need to worry about water leakage.

After the excavation is completed, the first propulsion jack 13 is contracted,
The rebar, the formwork, and the like are set according to the above-described procedure, and the work is advanced by repeating such steps. In addition,
It goes without saying that the pressure in the concrete piston chamber 23 is kept constant by the pressure holding jack 25 even after the excavation is completed.

If it is necessary to replace the sealing member 26 of the extrusion piston 24 during the above process, after the concrete is hardened, the extrusion piston 24 is extracted from the concrete piston chamber 23, and the sealing member 26 is replaced. I just need. This work is a simple work of extruding the extruding piston 24 using the pressure holding jack 25 after the concrete is hardened and replacing the seal member 26 on the outer periphery thereof, and since the replacement work is performed after the concrete is hardened, it is safe to perform the work on site. Can do it. Further, when it is necessary to clean the concrete pipe, the filling port 24a may be closed using the shut-off mechanism 28 attached to the extrusion piston 24, the casting pipe 30 may be removed, and the concrete pipe may be cleaned. Since this operation can prevent the concrete from flowing out from the filling hole by the blocking mechanism 28, it can be performed while applying pressure to the concrete in the concrete piston chamber 23, and the workability at the time of tunnel lining is improved. There is no loss.

In the above embodiment, the tail of the shield machine 10 is doubled, a plurality of concrete piston chambers 23 are provided therein, and an extruding piston 24 is provided in the concrete piston chamber 23. Since the pressure in each concrete piston chamber 23 is adjusted by the pressure holding jack 25, the concrete pressure in each chamber is changed in response to a change in the ground pressure (normally, the pressure increases as the depth increases). Can be individually controlled, and it is possible to reliably and easily maintain the concrete pressure always higher than the ground pressure.

In the embodiment, the concrete piston chamber 23 is provided in the tail portion of the shield machine, and the extrusion piston 24 is slidably disposed in the factory in a state where the extrusion piston 24 is sealed in the concrete piston chamber 23 beforehand. The accuracy of the seal portion of the piston 24 can be maintained at the same level as the seal of a movable portion such as a cutter of a shield machine, and almost all the grounds that the shield machine can support can be handled.

Further, in the embodiment, since the replacement of the seal important for maintaining the pressure of the concrete can be performed safely and easily, the replacement of the seal can be performed even during long excavation, so that the concrete pressure is always maintained. There is an advantage that holding is possible. Also, with the supply of concrete, the extruding piston 24 is moved forward, and when extruding the concrete, it is moved to the rear of the shield machine, so that the pressure in the concrete piston chamber is substantially constant even when the concrete is supplied. It is possible to maintain, and as a result, there is an effect that it does not apply excessive pressure to the ground and the formwork, does not push up the ground, and there is no need to make the formwork more robust than necessary. .

In addition, since the pressure in the concrete piston chamber 23 can be always maintained higher than the earth pressure and water pressure of the ground, the above-mentioned method can be used to cast high-strength high-quality concrete without water leakage. In addition, there is an advantage that the filling of the tail void can be surely performed, so that there is no danger of land subsidence.

Further, in the embodiment, since the concrete is always pressed by the pushing piston 24, it is possible to use the concrete having a long hardening time, and it is not necessary to clean the pipes for each ring. There is also an effect of becoming.

In the embodiment, since the reinforcing bar U is attached to the wife frame and used as a separator, the jack of the wife frame is not required, and when the jack is provided in the wife frame, the jack is removed as necessary. There is an advantage that it becomes possible.

Further, the space between the inner cylinder 21 and the mold frame 1 is closed by a main wife frame 50 and an auxiliary wife frame 51 joined to the main wife frame 50, and the shield of the auxiliary wife frame 51 is adjusted by adjusting the appearance of the auxiliary wife frame 51. 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 shield tunnel lining method of the present invention, the pressures of the extruding pistons in the plurality of concrete piston chambers formed in the tail portions are individually controlled by the pressure holding jacks, thereby covering the respective chambers. Since the pressure of the material can be managed individually, it can be easily adapted to the difference in the ground pressure due to the height, and the pressure of the lining material is always kept higher than the earth pressure and water pressure of the ground. It becomes possible. Further, by such an operation, the tail void is reliably filled with the lining material, and there is no possibility of sinking.

When assembling the rebar, a main wife frame is disposed in contact with the inner surface of the inner cylinder of the shield machine, and a gap between the inner end of the main wife frame and the outer surface of the mold frame is formed. This is because a plurality of arc-shaped auxiliary wive frames formed in a ring shape as a whole are overlapped with each other in the circumferential direction from the ring-shaped storage groove formed on the outer surface and are closed by projecting outward. After placing the lining material in the rebar assembling room, when moving the auxiliary wive frame inward, the auxiliary wive frame is moved inward by increasing the overlap between the circumferential ends of the auxiliary wive frame. Can be moved very easily to

Further, the gap between the circumferential end portions of the arcuate auxiliary frame and the ring-shaped storage groove on the outer surface of the formwork is sealed by a seal member interposed therebetween. Therefore, when the lining material is poured into the rebar assembling room, it is possible to satisfactorily seal the overlapped portion between the circumferential ends of the auxiliary wive frame, which is the location where the lining material leaks most easily. In addition, leakage of the lining material can be prevented.

According to the second aspect of the present invention, the ring-shaped main frame is set so that the outer end thereof is in contact with the inner surface of the inner cylinder, and the inner end of the main frame and the formwork. The peripheral ends are overlapped with each other so as to close them between the outer surfaces of the mold, and are formed in a ring shape as a whole, and project outward from a ring-shaped storage groove formed on the outer surface of the formwork. A plurality of arcuate auxiliary rims, and a sealing member storage recess provided in a ring-shaped storage groove of the mold so as to face a superposed portion between circumferential ends of the auxiliary rims. And the seal member housed in the seal member housing recess, so that the method according to claim 1 can be suitably performed.

According to the third aspect of the present invention, since the bolts are provided on both sides of the auxiliary frame with the same axial line therebetween and the bolts are supported by the reaction force receiving ribs, the compressive force is applied to the form. Is applied, the bolts, the auxiliary frame, and the reaction force receiving ribs receive the applied compressive force on the entire mold, and form a ring-shaped storage groove for storing the auxiliary frame in the mold. The strength can be prevented from lowering.

According to the fourth aspect of the present invention, since the bolt is provided with the bolt rotating means for rotating the bolt, the bolt can be rotated and moved in the axial direction of the bolt. The work of bringing the tip into contact with the auxiliary wife frame or separating it from the auxiliary wife frame can be performed extremely easily.

According to the fifth aspect of the present invention, a thrust transmitting portion extending from one end to the other end of the form is provided on the form so as to straddle the ring-shaped storage groove, and the thrust transmitting portion is provided with a reaction force receiving rib. Is fixed, it is possible to firmly support the reaction force receiving rib to which an excessive force tends to be applied, and to further increase the strength of the formwork.

[Brief description of the drawings]

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

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

FIG. 3 is a sectional view taken along line BB in FIG. 1;

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

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

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

FIG. 7 is a sectional view taken along line DD of FIG. 5;

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

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

FIG. 10 is a sectional view taken along line EE in FIG. 9;

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

FIG. 12 is a sectional view taken along the line FF in FIG. 11;

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

FIG. 14 is a front view showing a relationship between an auxiliary wife frame and a bolt.

FIG. 15 is a sectional view taken along the line GG of FIG. 13;

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 Formwork 1d Ring-shaped storage groove 1e Side wall 10 Shield 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 wife frame 51 Auxiliary wife frame 51a End Reference Signs List 60 seal member storage recess 61 bag-shaped seal member 62 gap 63a, 63b pressure receiving rib 66 female screw part 67 bolt rotating means 67a protrusion 67b rod 68 thrust transmitting part

Continuing on the front page (72) Inventor, Fumio Kawakami 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Hiroyuki Kawaguchi 1-2-3, Shibaura, Minato-ku, Tokyo Shimizu Corporation Inside (72) Inventor Hidetake Ishizaki 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Taikichi Arato 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Masayuki Otsuka 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Shinji Seki 2-3-1 Shibaura, Minato-ku, Tokyo Shimizu Corporation ( 56) References JP 4-247200 (JP, A) JP 4-161599 (JP, A) JP 1-169097 (JP, A) JP-A 52-150232 (JP, U) (58) ) Surveyed field (Int.Cl. ⁷ , DB name) E21D 11/10

Claims (5)

(57) [Claims] 1. Excavating the ground with a cutter device at the tip of a shield machine, covering the excavated peripheral wall of a tunnel with a predetermined interval with a formwork, and disposing a reinforcing bar between the formwork and the peripheral wall. A method for lining a shield tunnel, in which a lining material is supplied together with the inner surface of the tunnel, wherein a tail portion of a skin plate of the shield machine is formed by an outer cylinder and an inner cylinder. A plurality of concrete piston chambers are provided between the outer cylinder and the inner cylinder of the tail portion, the plurality of partition walls extending in the radial direction of the skin plate being formed, and a plurality of concrete piston chambers for accommodating the extrusion piston are provided, and a reinforcing bar is arranged inside the inner cylinder. Then, when assembling the formwork inside the rebar, set the ring-shaped main wife frame that closes between the inner cylinder and the formwork together 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 wife frame is received as a substitute for the separator by connecting the reinforcing bars, and a gap between the inner end of the main wife frame and the outer surface of the mold is formed on the outer surface of the mold. A plurality of arcuate auxiliary frames formed in a ring shape as a whole by overlapping the circumferential end portions of each other from the storage groove are closed by projecting outward, and the periphery of the arcuate auxiliary frames is closed. After sealing between the overlapping portions of the directional ends and the ring-shaped storage groove on the outer surface of the mold by a seal member interposed therebetween, the inner cylinder, the mold, the main wife frame, and the auxiliary A lining material is poured into a reinforcing bar assembly room surrounded by a wife frame made of a wife frame, and a lining material is poured from a concrete piston room between the formwork and the ground to cover the reinforcing bar assembly room. The pressure of the lining 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 wive 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 reinforcing bar assembly room are removed. And the pressure holding jack presses the extrusion piston in the concrete piston chamber so that the pressure of the lining material becomes higher than the earth pressure of the ground and the water pressure. A method for lining a shield tunnel, comprising excavating a shield machine. 2. A shield frame structure for closing a gap between an inner cylinder forming a concrete piston chamber at a tail portion of a skin plate of the shield machine and a mold covering a peripheral wall of a tunnel excavated by the shield machine. A ring-shaped main wive frame set so that the outer end thereof is in contact with the inner surface of the inner cylinder; and a peripheral space between the inner end of the main wive frame and the outer surface of the formwork, so as to close both of them. A plurality of arc-shaped auxiliary wive frames formed by overlapping the end portions in a ring shape as a whole and formed in a ring shape as a whole and projecting outward from a ring-shaped storage groove formed on an outer surface of the mold frame; and A sealing member storage recess provided in the ring-shaped storage groove so as to face an overlapping portion between circumferential ends of the auxiliary wife frame, and the auxiliary wife frame stored in the seal member storage recess. Overlap between circumferential ends of Wife frame structure of the shield machine, characterized by comprising a seal member for sealing between. 3. The tie frame structure of a shield machine according to claim 2, wherein bolts are provided on the both sides of the seal groove of the mold frame with the auxiliary tie frame interposed therebetween, and the bolts are coaxial. Are each supported by reaction force receiving ribs. 4. The wand frame structure for a shield machine according to claim 3, wherein said bolt is provided with bolt rotating means for rotating said bolt. 5. The frame structure of a shield machine according to claim 4, wherein the form is provided with a thrust transmitting portion extending from one end to the other end of the form so as to straddle a ring-shaped storage groove, and The end frame structure of the shield machine, wherein the reaction force receiving rib is fixed to the thrust transmitting portion.