JPH0579295A - Shield machine for lining cast-in-place concrete - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To form a lining of cast-in-place concrete covered with a cylindrical impermeable membrane on the wall of the excavation tunnel. [Structure] A plurality of press jacks 4 are arranged along the inner peripheral surface of a skin plate 2 of a shield machine main body 1, and a propulsion jack 8 is provided on the inner peripheral side of these press jacks 4.
Is installed, the impermeable membrane storage chamber 5 is integrally connected to the rod end of the press jack 4, and the press ring 7 is provided at the rear end of the impermeable membrane storage chamber 5 so as to project from the rod of the press jack 4. Of the impermeable membrane storage chamber 5 and the press ring 7
Form B assembled in the tail part of the skin plate 2 and the impermeable membrane pulled out from the storage chamber 5 by moving the
It is configured such that the concrete filled in the space is pressed and the storage chamber 5 is integrally advanced by contraction of the rod of the press jack 4 and the impermeable membrane is pulled out rearward from the outlet 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine for cast-in-place concrete lining, in which when the cast-in-place concrete lining is applied to a tunnel during excavation, the concrete lining is covered with an impermeable film. Is.

[0002]

2. Description of the Related Art Conventionally, in order to perform a cast-in-place concrete lining on a tunnel excavated by a shield machine, a form is formed on the inner surface of the tunnel extending from the tail portion of the skin plate of the shield machine to the rear portion as appropriate. Assembling is performed by filling concrete between this formwork and the wall surface of the tunnel excavation. At this time, insert it into the annular space between the formwork and the tail part so that the concrete is in a sufficiently consolidated state. A press jack having a possible press ring is mounted on the inner peripheral surface of the skin plate, and the press concrete is pressed by the press ring by the operation of the press jack.

[0003]

However, in such a lining forming means using cast-in-place concrete, the filled concrete comes into direct contact with the excavated wall surface of the tunnel, so that part of the filled concrete is excavated in the tunnel. Not only is it uneconomical because it penetrates into the ground from the wall surface and requires an extra concrete filling amount.
There is a risk that the quality of the concrete will deteriorate due to groundwater and it will not be possible to obtain a concrete lining of a predetermined strength. Furthermore, after solidification of the concrete, groundwater will permeate into the concrete lining and enter the tunnel. There is a point.

On the other hand, the impermeable membrane storage chamber is integrally mounted on the inner peripheral surface of the skin plate of the shield excavator, and the tubular impermeable membrane is pulled out to the excavation tunnel side from the rear end of the outer peripheral surface of the impermeable membrane storage chamber. However, concrete is also filled between the impermeable membrane and the form, and this method can prevent the infiltration of groundwater as described above, but the inner surface of the skin plate cannot contain the impermeable membrane. Since it is attached integrally, it is not possible to equip the press jack having the above-mentioned press ring, and therefore, there is a possibility that the filled concrete cannot be consolidated and a portion where the filling is insufficient is generated. An object of the present invention is to provide a shield machine for cast-in-place concrete lining that can solve such problems.

[0005]

In order to achieve the above object, a shield machine for cast-in-place concrete lining of the present invention has press jacks mounted on a plurality of rear inner peripheral surfaces of a skin plate of a shield machine body, The rod end of the press jack is integrally connected to a water impermeable membrane storage chamber having a water impermeable membrane outlet at the outer peripheral side rear end, and a filling concrete press ring is projectingly provided at the rear end of the water impermeable membrane storage chamber. Further, it has a structure in which a plurality of propulsion jacks are arranged on the inner peripheral side of the press jack.

[0006]

[Function] In the space between the impermeable membrane pulled out rearward from the impermeable membrane storage chamber and the formwork assembled in the tail portion of the skin plate of the shield machine body, concrete is injected through a filling port provided at an appropriate position of the formwork. Fill. At this time, the press ring protruding from the rear end of the impermeable membrane storage chamber is located between the impermeable membrane and the end of the mold in the vicinity of the outlet of the impermeable membrane,
It prevents the filled concrete from flowing into the machine.

After the concrete is filled, when the press jack and the propelling jack are extended, the extension of the press jack presses the filled concrete with the press ring through the impermeable membrane storage chamber connected in series with the jack to consolidate it. On the other hand, the extension of the propulsion jack allows the shield machine to propel the mold end face as a reaction force receiving face for a certain length.

Next, when these jacks are contracted, the water-impermeable film storage chamber moves forward integrally due to the contraction of the press jack, and accordingly, the water-impermeable film in the storage chamber is automatically pulled out rearward. On the other hand, due to the contraction of the propulsion jack, a space is formed on the inner peripheral surface side of the water-impermeable film that has been pulled out, and the next mold is assembled in the space. Hereinafter, similarly to the above, concrete is filled between the formwork and the pulled out impermeable membrane, and this work is repeated to perform concrete lining on the wall surface of the excavation tunnel.

[0009]

Embodiments of the present invention will now be described with reference to the drawings.
Reference numeral 1 denotes a shield machine main body, which has a cutter head 12 which is rotated by a motor 11 at a front end of an opening of a skin plate 2, and a vertically fixed support wall plate 3 which is integrated at an appropriate position on an inner peripheral surface of the skin plate 2. It is provided.

Reference numeral 4 denotes a plurality of press jacks arranged along the inner peripheral surface of the rear portion of the skin plate 2 at regular intervals in the circumferential direction, the base end (front end) of which is the rear surface of the vertical fixed support wall plate 3. It is fixed and supported by. The press jack 4 may be fixed to the inner peripheral surface of the skin plate 2.

5 is on the rear side of the press jack 4,
In the water-impervious membrane storage chamber arranged in series with the press jack 4, its front end face is a rod 4a of the press jack 4.
Is integrally connected to and fixed to and is movable back and forth along the inner peripheral surface of the skin plate 2 by the operation of these press jacks 4.

The water-impermeable membrane storage chamber 5 is formed in a hollow ring shape by connecting both ends of inner and outer double pipes 5a and 5b of a desired length by front and rear annular plates 5c and 5d, and The rear end of the pipe 5a and the outer peripheral edge of the rear annular plate 5d are opened to form the impermeable film outlet 6, and the inner pipe 5b is divided into a plurality of parts in the circumferential direction to form the front and rear annular plates 5c, 5d. The flexible tubular impermeable membrane A made of a synthetic resin sheet or the like can be housed in the lengthwise direction in a folded state.

Reference numeral 7 denotes a press ring having short legs integrally fixed to the surface of the rear annular plate 5d of the impermeable membrane storage chamber 5 and projecting rearward, which is integral with the impermeable membrane storage chamber 5. It moves back and forth and presses the filled concrete C described later.

Reference numeral 8 denotes a plurality of propulsion jacks arranged on the inner circumference side of the press jack 4 on a concentric circle in parallel with the press jack 4 at regular intervals in the circumferential direction.
The cylinder base end (front end) is fixed and supported on the rear surface of the vertical fixed support wall plate 3, and the tip end of the rod 8a can be brought into contact with the front end surface of the mold B described later.

A method for constructing a cast-in-place concrete lining while covering the tunnel excavated by the thus constructed shield machine with the impermeable membrane A will be described below. FIG. 1 shows that a new mold B is assembled in the tail portion of the skin plate 2, and concrete C is added to the space between the impermeable membrane A and the mold B through the filling holes 9 provided at appropriate positions of the mold B.
Shows the state of filling. The mold B is assembled so that the outer peripheral surface of the front end portion thereof is in sliding contact with the inner peripheral surface of the press ring 7,
Prevents the filled concrete C from leaking inside the machine.

Concrete is poured into the space through a concrete supply pipe 10 connected to and in communication with the filling hole 9, and after filling the space, the press jack 4 is operated to extend the rod 4a rearward. The impermeable membrane storage chamber 5 integrated in series with the rod 4a moves rearward, and the press ring 7 protruding from the rear end of the storage chamber 5 allows the concrete C filling the space portion to be filled. By pressing, the entire space between the water impermeable film A and the mold B is uniformly consolidated.

On the other hand, at the same time as the operation of the press jack 4, the propulsion jack 8 is operated, and as shown in FIG. Use the frame B as a reaction force to propel the shield machine body 1,
While rotating the cutter head 12, excavate the ground face,
A tunnel portion having a predetermined length is formed. At this time, the press jack 4 is constantly operated to maintain the compaction state of the filled concrete C by the press ring 7.

The filled concrete is sent out backward from the tail portion of the skin plate 2 together with the form B by the propulsion of the shield machine main body 1, and the impermeable membrane A is pressure-bonded to the excavated wall surface of the tunnel and the form B is removed. At this time, the concrete lining is continuously formed by the filled concrete C.

Next, as shown in FIG. 3, when the rod 4a of the press jack 4 and the rod 8a of the propulsion jack 8 are contracted to their original positions, the rod 4a of the press jack 4 contracts to cause the impermeable film storage chamber 5 to be retracted. And the press ring 7 integrally move forward, and in accordance with the forward movement, the tubular impermeable membrane A is stored in the storage chamber 5 in a folded state from the outlet 6 of the storage chamber 5.
Are automatically pulled out and stretched along the inner surface of the skin plate 2. While the shield machine body 1 is being dug, the filling concrete C is appropriately hardened and has almost no fluidity. Therefore, even if the press ring 7 separates, it does not flow out into the machine, but the press ring 7 is detached. After that, the end face may be temporarily fixed with an appropriate blocking plate.

A working space portion is provided on the inner peripheral surface side of the pulled out impermeable membrane A by contraction of the rod 4a of the press jack 4 and the rod 8a of the propulsion jack 8, and the working space portion is utilized. The next formwork is assembled in succession to the formwork B previously assembled. Then, through the filling hole 9 provided in the mold B, the concrete C is placed between the impermeable membrane A and the mold B.
And the rod 8a of the propulsion jack 8 is extended to propel the shield machine body 1 for a certain length in the same manner as above. By repeating this operation, the concrete lining covered with the impermeable film A is continuously formed on the wall surface of the excavation tunnel.

When the water-impervious membrane A in the water-impervious membrane storage chamber 5 disappears, as shown in FIG.
5b is removed, the end of the next impermeable membrane is appropriately connected and integrated with the end of the impermeable membrane remaining in the storage chamber 5, and then the divided inner pipe is assembled to the original state.

[0022]

As described above, according to the shield machine for cast-in-place concrete lining of the present invention, the press jacks are attached to a plurality of rear inner peripheral surfaces of the skin plate of the shield machine body, and the rod end of the press jack is attached. In addition, an impermeable membrane storage chamber having an impermeable membrane outlet at the rear end on the outer peripheral side is integrally connected, and a concrete press ring is projectingly provided at the rear end of this impermeable membrane storage chamber. Since it has a structure in which multiple propulsion jacks are arranged on the inner peripheral side of the jack, the impermeable membrane storage chamber with a press ring protruding from the rear end is connected in series with the rod rear end of the press jack. Since it is integrated in a shape, the arrangement structure of the storage chamber and the press jack is simple, it can be arranged neatly with the propulsion jack in a narrow shield machine, and these jacks can be operated smoothly. It is possible.

Further, when the rod of the press jack is contracted, the impermeable membrane storage chamber is integrally advanced and the impermeable membrane can be automatically pulled out rearward along the inner surface of the skin plate from its outlet. In addition, it can be pulled out with a constant tension and smoothly and surely along the excavated wall surface of the tunnel.

Further, when the rods of the press jack and the propulsion jack are contracted, a work space portion where the mold can be assembled is formed in the tail portion of the skin plate, and the work of assembling the mold can be easily performed and pulled out. It is possible to reliably prevent the concrete filled between the impermeable membrane and the mold from leaking to the inside of the machine by the press ring protruding from the rear end of the storage chamber.

Furthermore, as the shield jack is driven by the propelling jack and the press jack is extended, the filling concrete can be compacted by the press ring while being pushed out integrally with the impermeable membrane from the shield machine body into the rear excavation tunnel, By covering concrete with an impermeable membrane, it is possible to form a concrete lining that prevents deterioration of the quality of concrete due to groundwater and intrusion of groundwater.

[Brief description of drawings]

FIG. 1 is a simplified vertical cross-sectional side view of a state of being filled with concrete,

FIG. 2 is a simplified vertical sectional side view showing a state in which the shield machine is propelled,

FIG. 3 is a simplified vertical sectional side view showing a state in which the press jack and the propulsion jack are contracted,

FIG. 4 is a simplified vertical cross-sectional side view showing a state in which the water impermeable membrane storage chamber is opened.

[Explanation of symbols]

 1 Shield machine body 2 Skin plate 4 Press jack 5 Impermeable membrane storage chamber 6 Drawout port 7 Press ring 8 Propulsion jack A Impermeable membrane

Claims (1)

[Claims] 1. A watertight film storage chamber having pressjacks mounted on a plurality of rear inner peripheral surfaces of a skin plate of a shield machine main body, and having a watertight film outlet at a rear end on an outer peripheral side at a rod end of the pressjack. And a press ring of filled concrete is projected from the rear end of the water-impermeable membrane storage chamber, and a plurality of propulsion jacks are arranged on the inner peripheral side of the press jack. Shield machine for cast-in-place concrete lining.