JP2001193396A - Shield machine for cast-in-place lining and cast-in-place lining construction method using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent pressurized slurry fed to a cutter head part from flowing into the tail end side through a clearance between a shield outer cylinder and the ground and to perform construction while preventing vibration and displacement caused in a shield machine. SOLUTION: The shield machine 1 for cast-in-place lining is provided with a cutter head 2 on the front face, while the shield outer cylinder 3 following the cutter head 2 includes a front body 3A and a rear body 3B and is constructed freely extensively, and in excavation at least, the front body 3A can be moved forward while the rear body 3B is stopped. In this shield machine provided with concrete press jacks 9, 9 using a cast-in-place concrete side frame in common on the inside of the shield outer cylinder 3, freely expansible packing seals 11, 11 continuing annularly along the outer circumference of the rear body 3B are arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cast-in-place lining shield machine which excavates while sequentially constructing cast-in-place lining concrete in close contact with the ground and a cast-in-place lining method using the same.

[0002]

2. Description of the Related Art There has been known a "cast-in-place lining method" in which excavation and lining are simultaneously performed simultaneously and continuously. This cast-in-place lining method does not use expensive segments and is economical and inexpensive as compared with a general segment method. Also, since the concrete is poured while applying pressure, the surrounding ground is not loosened. Furthermore, since the excavation and the lining concrete are performed simultaneously, there is an advantage that the steps such as backfilling can be omitted and the construction speed is high.

[0003] More specifically, the construction method and procedure will be described. A shield machine 50 to be used is provided with a cutter head 51 at a front portion as shown in FIG. A concrete press jack 52 (hereinafter, simply referred to as a press jack) for applying a compressive force to the later concrete, and a propulsion jack 53 for advancing the front body by taking a reaction force on the inner formwork, and are connected to the shield machine 50 continuously. In addition, a mold release device 54 for re-arranging the inner form is provided.

[0004] When one cycle of excavation by the shield machine 50 is completed, as shown in FIG. 13A, the press jack 52 and the propulsion jack 53 are both pulled back to open the cast-in-place concrete partial area of the next cycle.
Then move, as shown in FIG. 13 (B), if installed rebar cage 55, with the mold demolding device 54, the inner mold 56 _n to the front row position that is installed at the end And install it. Subsequently, as shown in FIG. 13 (C), after Da設in the concrete that is enclosed by the inner mold 56 _n and the skin plate 57 spaces, as shown in FIG. 13 (D), the press jack while a compressive force to pouring concrete by 52, so as to advance the shield machine 50 while maintaining a reaction force to the side end surface of the inner mold 56 _n by propulsion jacks 53. This procedure is repeated for each cycle excavation, thereby constructing lining concrete concurrently with excavation.

[0005]

Usually, in shield excavation, in order to reduce the friction between the shield outer cylinder and the ground, a diameter slightly larger than the outer diameter of the shield outer cylinder (+30 to
Excavation (so-called overcut) is performed. For this reason, there arises a problem that the pressurized muddy water supplied to the cutter head portion enters the rear concrete placing area through the gap between the shield outer cylinder and the ground, and in particular, FIG. 13 (A) In the state shown in
Since the press jack 52 is separated from the concrete end face, there is a problem that the pressurized muddy water may leak into the tunnel from a slight gap between the tail end and the cast concrete.

On the other hand, when the shield machine excavates,
Vibration is generated by the rotation of the cutter head 51. During this excavation, the presence of the overcut formed around the shield outer cylinder may cause the shield machine 50 to swing or the attitude of the shield machine 50 to be displaced.

Accordingly, a main object of the present invention is to prevent pressurized muddy water supplied to a cutter head portion from flowing into a tail end side through a gap between a shield outer cylinder and a ground and to a shield machine. It is an object of the present invention to provide a cast-in-place lining shield machine capable of performing construction while preventing generated vibration and displacement, and a cast-in-place lining method using the same.

[0008]

A shield machine for cast-in-place lining according to the present invention for solving the above-mentioned problems has a cutter head on the front surface, and a shield outer cylinder following the cutter head has a front body and a rear body. It is configured to be stretchable including
In a shield machine equipped with a concrete press jack that also serves as a cast-in-place concrete frame inside the shield outer cylinder, at least when the rear body is stopped at the time of excavation, the front body can be advanced. The present invention is characterized in that one or a plurality of expandable and contractible packing seals that are annularly continuous along the outer periphery are provided.

In this case, the packing seal is provided in a recess formed continuously in an annular shape along the outer periphery of the rear barrel, and is capable of expanding and contracting by supplying or extracting a liquid or gas. desirable. Further, in order to prevent the abrasion of the packing seal, a wear-preventing steel plate for closing the front side of the opening of the recess is rotatably and urged in the closing direction with respect to the recess accommodating the packing seal. Alternatively, an abrasion-preventing elastic stretchable sheet material for completely closing the opening of the recess can be provided in the recess accommodating the packing seal.

[0010] On the other hand, the cast-in-place lining method using the shield machine comprises a first step of pulling back at least the concrete press jack after a predetermined curing time has elapsed and opening a concrete casting partial area in the next cycle. A second step in which a reinforcing bar is arranged in the concrete casting part area, an inner formwork is installed on the inner peripheral surface side, and concrete is poured into the inside, and a packing seal of the rear body is shrunk to stop water. After the pressure is released, a third step of advancing the rear trunk while applying pressure to the cast concrete by the concrete press jack, expanding the packing seal of the rear trunk, and supporting the rear trunk portion against the ground. At the same time, the pressurized muddy water supplied to the cutter head part passes through the gap between the shield outer cylinder and A step of excavating while advancing the front fuselage as a state that can prevent intrusion into the tunnel side, and performing tunnel excavation while sequentially constructing cast-in-place concrete by repeating the step. Is what you do.

In the present invention, as a shield machine to be used, instead of the conventional shield machine having a single outer cylinder,
A shield machine including a front body and a rear body is provided, and one or a plurality of expandable and contractible packing seals that are annularly continuous along the outer periphery of the rear body are provided. In the construction, except when the rear trunk is advanced, the construction is performed in a state where the packing seal is operated. As a result, the pressurized muddy water supplied to the cutter head can be reliably prevented from flowing into the tail end side through the gap between the shield outer cylinder and the ground, and the ground excavation is performed. Since the rear body is supported by the packing seal that comes into contact with the surface in a compressed state, the construction can be performed while preventing vibration and displacement generated in the shield machine.

[0012]

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

[Structure of shield machine] The shield machine 1
As shown in FIG. 1, a cutter head 2 for excavating the ground is provided at the front of the fuselage, and a shield outer cylinder 3 following the cutter head 2 is divided into a front body 3A and a rear body 3B. The front trunk 3A and the rear trunk 3B have a lap portion of a predetermined length range, specifically, a one-cycle excavation length at a joint portion, and are extendable and contractible in the longitudinal direction. A bulkhead 5 provided in a partition shape at the front of the front trunk 3A.
The space between the cutter head 2 and the cutter head 2 is a cutter chamber 4 for taking in earth and sand, and a mud feeding pipe 6 and a mud discharging pipe 7 are connected to each other.

Inside the rear trunk 3B, there are provided press jacks 9, 9,... Which are supported by the partition wall 8 and apply a compressive force to the poured concrete at appropriate intervals along the outer periphery. Rear body propulsion jacks 10, 10,... Are provided at appropriate positions along the outer circumference at the same intervals.

On the other hand, on the outer periphery of the rear trunk 3B, expandable and contractible packing seals 11, 1 which are annularly continuous in the circumferential direction are provided.
1 is provided in two articles. The number of the packing seals 11 may be one, or three or more.

As shown in detail in FIG. 2, the packing seal 11 is annularly continuous along the outer periphery of the rear body skin plate 12 in order to avoid contact with the ground when the rear body 3B is propelled. A concave portion 12a is provided, and can be accommodated in the concave portion 12a when contracted. The packing seal 11 is provided on each side edge of a packing seal rubber 13 formed in a belt shape with a predetermined width.
4 and 15 are integrally provided, and the fixing fittings 14 and 15 are fixed by fixing bolts 16, 16... To form a tube-shaped packer body that is continuous along the outer peripheral direction. The discharge port of the flow path 17 formed inside the skin plate 12 faces the inner space of the packing seal 11, and is expandable and contractable by supplying or extracting a working fluid such as liquid or gas. FIG.
(B) shows a state in which the working fluid is supplied to expand the packing seal 11 so as to stop the water in the overcut portion 18 so that the pressurized muddy water does not flow into the rue end side.

As shown in FIG. 3, the packing seal 11 is provided with a wear-preventing steel plate 19 rotatably supported at a front side of the recess 12a and having a pivot point as shown in FIG. You may do so. The steel plate 19 for abrasion prevention is provided so as to cover only the front side portion of the concave portion 12a so that at least a part of the packing seal 11 comes into direct contact with the ground surface when the packing seal 11 expands, and is provided when the packing seal 11 contracts. The coil spring 20 is wound around the rotation fulcrum so as not to be an obstacle when the trunk 3B is propelled, and is urged in the closing direction.

Further, in order to prevent abrasion, as shown in FIG. 4, an elastically stretchable sheet material 22 may be provided so as to completely cover the opening surface of the recess 12a. When the packing seal 11 is operated, as shown in FIG. 4 (B), the elastic elastic sheet material 22 expands together with the expansion of the packing seal 11 so that the overcut portion 18 is expanded.
Also shut off the flow path.

On the other hand, between the front trunk 3A and the rear trunk 3B, a plurality of front trunk propulsion jacks 23 are provided in the circumferential direction for moving the front trunk 3A forward while the rear trunk 3B is stopped during excavation. A reaction force gripper 25 for fixing the front body 3A when the press jack 9 and the rear body propulsion jack 10 are pulled back and when the rear body 3B moves forward is provided on the shield beam 24 that continues rearward from 3A. Reference numeral 26 denotes a beam for a mold releasing device for rearranging the last inner mold to the front row position.

In the above example, the jack 10 for propelling by taking a reaction force to the inner formwork is used for rear body propulsion, and the jack 23 for connecting the front body 3A and the rear body 3B is used for front body propulsion. The front end of the jack which takes a reaction force to the inner formwork may be fixed to the front trunk 3A for front trunk propulsion, and the jack 23 connecting the front trunk 3A and the rear trunk 3B may be used for rear trunk propulsion. Further, in this example, the shield outer cylinder 3 is divided into the front body 3A and the rear body 3B, but a middle body for each folding may be provided in the middle to cope with curve construction.

[Construction Procedure] The steps shown in FIG. 1, that is, the steps from the time when concrete is cast and its curing is completed will be described in order. In addition,
In this state, the packing seal 11 is inflated, the flow path of the overcut 18 is blocked, and the rear trunk 3B is supported against the ground by the pressure of the packing seal 11.

When the curing for a predetermined time is completed, as shown in FIG.
Is fixed, the press jack 9 and the rear trunk propulsion jack 10 are pulled back to open the concrete placing partial area S of the next cycle.

Next, as shown in FIG. 6, after the reinforcing rod cage 31 is placed in the concrete placing part area S, the inner mold 30 positioned at the rearmost position by a mold removing device (not shown).
Is moved to set the inner formwork 30 in the concrete placing partial area S. When the work so far is completed, concrete is poured and poured as shown in the figure.

Next, as shown in FIG. 7, if the packing seal 11 is contracted and the water stoppage is released, FIG.
As shown in (1), the press jack 9 and the rear trunk propulsion jack 10 are extended to move the rear trunk 3B forward. In addition,
The forward completion state of the rear trunk 3B is the state shown in FIG.

When the forward movement of the rear trunk 3B is completed, FIG.
As shown in, the packing seal 11 is expanded,
A state in which the rear trunk 3B is supported against the ground and the pressurized muddy water supplied to the cutter head 2 can be prevented from entering the tail end side through the gap between the shield outer cylinder and the ground. And Thereafter, as shown in FIG. 11, excavation is performed by extending the front trunk propulsion jack 23 while rotating the cutter head 2, and excavation for one cycle length is performed.

By repeating the above steps, tunnel excavation is performed while sequentially constructing cast-in-place lining concrete.

[0027]

As described in detail above, according to the present invention, pressurized muddy water supplied to the cutter head is prevented from flowing into the tail end side through the gap between the shield outer cylinder and the ground. And the construction can be performed while preventing the vibration and displacement generated in the shield machine.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a shield machine for cast-in-place lining according to the present invention.

FIGS. 2A and 2B are enlarged cross-sectional views of a main part showing a packing seal portion, and FIG.

FIG. 3 is a view showing a modified example of the packing seal structure.

FIG. 4 is another modified example of the packing seal structure.

FIG. 5 is a construction procedure diagram (part 1) of the cast-in-place lining method according to the present invention.

FIG. 6 is a construction procedure diagram (part 2) of the cast-in-place lining method according to the present invention.

FIG. 7 is a construction procedure diagram (part 3) of the cast-in-place lining method according to the present invention.

FIG. 8 is a construction procedure diagram (part 4) of the cast-in-place lining method according to the present invention.

FIG. 9 is a construction procedure diagram (part 5) of the cast-in-place lining method according to the present invention.

FIG. 10 is a construction procedure diagram (part 6) of the cast-in-place lining method according to the present invention.

FIG. 11 is a construction procedure diagram (part 7) of the cast-in-place lining method according to the present invention.

FIG. 12 shows a conventional shield machine 50 for cast-in-place lining.
FIG.

FIG. 13 is a conventional procedure diagram of a cast-in-place lining procedure.

[Description of Signs] 1 ... Shield machine, 2 ... Cutter head, 3 ... Shield outer cylinder, 3A ... Front trunk, 3B ... Rear trunk, 4 ... Cutter chamber,
9 ... press jack, 10 ... rear trunk propulsion jack, 11 ...
Packing seal, 12 ... rear body skin plate, 12a
... recess, 13 ... rubber for packing seals, 14, 15 ...
Fixing bracket, 17: flow path, 18: overcut part, 1
9: Steel plate for wear prevention, 20: coil spring, 22: elastic and elastic sheet material, 23: front trunk propulsion jack, 24: shield beam, 25: reaction force gripper

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kazuaki Ohno 4-12-20 Nihonbashi Honcho, Chuo-ku, Tokyo Sato Industry Co., Ltd. F term (reference) 2D054 AC01 AD20 2D055 BA01 BB01 DA00 JA06

Claims (5)

[Claims] (1) A cutter head is provided on a front surface,
A shield outer cylinder following this is configured to be extendable and retractable including a front trunk and a rear trunk, and at least at the time of excavation, the front trunk can be advanced in a state where the rear trunk is stopped, and a place inside the shield outer cylinder is provided. A cast-in-place lining comprising a concrete press jack also serving as a cast-in-place concrete frame, comprising one or a plurality of expandable and contractible packing seals that are annularly continuous along the outer periphery of the rear trunk. For shield machine. 2. The packing seal is provided in a concave portion formed continuously in an annular shape along the outer periphery of the rear trunk,
The shield machine for a cast-in-place lining according to claim 1, wherein the shield machine is made expandable and contractable by supplying or drawing out a liquid or a gas. 3. The place according to claim 2, wherein a wear-preventing steel plate for closing the front side of the opening of the recess is rotatably and urged in the closing direction with respect to the recess accommodating the packing seal. Punch lining shield machine. 4. The shield machine for a cast-in-place lining according to claim 2, wherein an elastic elastic sheet material for preventing abrasion, which completely closes the opening of the recess, is provided for the recess accommodating the packing seal. 5. A cast-in-place lining method using the shield machine for cast-in-place lining according to any one of claims 1 to 4, wherein after a predetermined curing time has elapsed, at least the concrete press jack is pulled back, and concrete in a next cycle is formed. A first step of opening the casting partial area; a second step of arranging a reinforcing bar in the concrete casting partial area, installing an inner formwork on the inner peripheral surface side, and injecting and casting concrete inside. And a third step of retracting the packing seal of the rear trunk to release the water blocking function and then advancing the rear trunk while applying pressure to the concrete poured by the concrete press jack; and a packing seal of the rear trunk. And pressurized mud supplied to the cutter head part while supporting the rear trunk part against the ground. A fourth step of excavating while advancing the front fuselage so that the gap between the shield outer cylinder and the ground is prevented from entering the tail end side as a flow path; A cast-in-place lining method characterized by tunnel excavation while constructing concrete sequentially.