JPH02101295A - Shield and lining method using the same - Google Patents

Abstract

PURPOSE:To perform curve construction by providing a concrete feeding means on a press ring section provided integrally with the main body of a rear shield and providing a drilling jack between a formwork support member provided on the inside of the press ring section and the main body. CONSTITUTION:When a shield 1 is advanced in the arrow A direction by one ring L1 of a formwork 13B, the ram 6a of a drilling jack 6 is fully protruded in the arrow B direction. The ram 6a is then retreated in the direction A by the distance L1, and the first concrete placement space 23 is formed between the formwork 13B, a gauge ring 11, a press ring section 5f and a construction joint face 29A. Concrete mortar 21 is placed in the space 23. A front shield 2 is drilled in the direction A, a rear shield 5 is drilled, the second concrete placement space is formed, and mortar 21 is placed in the space. When the ground is drilled by the distance L1, the drilling with the jack 6 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention is directed to T! A: Cast-in-place concrete/mortar (What is meant by "concrete/mortar" here?

It means "concrete" or "mortar."

Same below. ) and a method for constructing a lining using the shield.

(b), Conventional technology Conventionally, when constructing a lining for a tunnel excavated by a shield such as a shield excavator, annular concrete mortar is divided into several segments according to the diameter of the tunnel. We had to manufacture several types of
In order to eliminate this inconvenience, various proposals have recently been made for constructing the lining of a tunnel excavated by a shield excavator or the like using cast-in-place concrete and mortar. For example, JP-A-63-156198 and JP-A-63-1
56199, a shield excavator consisting of a cylindrical outer shell and a press ring and capable of effectively filling the tail void is one example.

(C) 1 Problem to be Solved by the Invention However, with this method, the length of the shield must be increased by the length corresponding to the press ring, making it difficult to construct a single curve. Another disadvantage is that concrete placement and shield excavation cannot be carried out at the same time, resulting in a long working time.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, it is an object of the present invention to provide a shield that can be constructed in a curved line and requires less work time, and a method for constructing a lining using the shield.

(d) Among the means for solving 1 problem, that is, 1 present invention, the shield invention is based on the front shield (2
) body (2c) and rear shield (5°) body (5d)
are relatively movable, and their main bodies (2c
, 5d), connect the pressure jack (9) to the front shield (2).
) body (2C) and the body (5d) of the rear shield (5)
The main body (2) of the front shield (2) is connected to the main body (2) of the front shield (2).
c) and the connection part (5d) of the rear shield (5)
17), a flexible sealing member (2b) is attached to the ground (
19) and the cabin space (16), and the rear shield (5) is provided with a main body (5d) of the rear shield (5).
), a press ring part (5f) is formed integrally with the press ring part (5f), and a concrete supply means (5a) is provided in the press ring part (5f), the supply direction of which is in the shield excavation direction,
Further, a formwork support member (11) is provided inside the press ring part (5f) so as to be movable in the shield excavation direction, and the formwork support member (11) and the main body (2) of the front shield (2) are provided.
c), and a 1wI advance jack (6) is provided between the two.

Further, one aspect of the present invention relates to a method for constructing a lining using the shield, when constructing the lining (20) using the shield (1), the excavation jack (6) is driven. The formwork support member (11) is moved in the excavation direction, the formwork (13) is installed on the formwork support member (11), and the formwork is formed between the formwork (13) and the press ring part (5f). Concrete and mortar (21) are placed in the primary concrete placement space (23).
and then drive the excavation jack (6) to remove the main bodies (5d) of the front shield (2) and the rear shield (5).
) is moved in the excavation direction, and at the same time, concrete is placed in the secondary concrete placement space (26) formed between the primary concrete placement space (23) and the ground (19).
Mortar (21) is injected via the concrete supply means (5a), and the pressure jack (9) is driven.

At the same time as the main body (5d) of the rear shield (5) is pulled toward the front shield (2), the space between the primary concrete placement space (23) and the other pile (19) that is generated due to the pulling operation. Concrete mortar (21) is poured into the space (31) through the concrete supply means (5a), and then the press ring part (5f) is poured into the uncured concrete mortar (21). It is configured so that it can be moved by pressing on it. Further, when driving the excavation jack (6) to move the main bodies (5d) of the front shield (2) and the rear shield (5) in the excavation direction, the front shield (2) is moved to the rear shield (5). ) may be configured to be performed while being tilted with respect to the main body (5d).

Note that the numbers in parentheses are for convenience to indicate corresponding elements in one drawing, and therefore, this description is not limited to the description on the drawing. r(e) below,
The same applies to the column "Effect".

(0) 0 effect With the above-described configuration, the present invention provides a press ring portion (5f) integrally formed with the main body (5d) of the rear shield (5).
Therefore, the concrete is placed simultaneously with the excavation of the shield (1).

(f), Example Hereinafter, the present invention will be explained in detail based on the drawings.

Fig. 1 is a front sectional view showing an embodiment of the shield according to the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is the main body of the front and rear shields constituting the shield according to the present invention. 4 to 9 are process diagrams showing an example of constructing a lining using the shield according to the present invention.

A shield 1 according to the present invention is composed of a front shield 2 and a rear shield 5, as shown in FIG. The front shield 2 has a main body 2c formed in a cylindrical shape, and a cutter 3 is rotatably supported on the front surface of the main body 2C, that is, the left side surface in FIG. The cutter 3 has a partition wall 2a provided to block the space inside the main body 2C in the horizontal direction in the figure.
The drive motor 3a is connected to the drive motor 3a provided in the drive motor 3a. Also,
On the bulkhead 2a, a plurality of digging jacks 6 are arranged in a circular ring along one main body 2C as shown in FIGS. It is provided so that it can protrude and retreat in the A and B directions. ram 6a
A gauge ring 11 formed in an annular shape is attached to the tip of the pin through a pin joint 7.

Furthermore, a plurality of pressurizing jacks 9 are arranged in an annular shape along the main body 2C on the partition wall 2a, and a ram 9a is provided on the pressurizing jack 9 so that it can protrude and retreat in the directions of arrows A and B. There is. In addition, a connecting portion 17 constituted by a rear end on the right side in FIG. 1 of the main body 2c and a front end on the left side in FIG. 1 of the main body 5d of the rear shield 5, which will be described later, is as shown in FIGS. , has a sealing part 2d formed in a thin annular shape, and sealing members 2b, 2b made of a flexible material such as rubber are attached to the inner peripheral surface of the sealing part 2d in an annular shape alternately around the entire circumference. has been done. Note that the length L of the seal portion 2d in the directions of arrows A and B
3 is formed slightly longer than the maximum stroke length of the ram 9a.

Behind the front shield 2, that is, on the right side in Figure 1.

A rear shield 5 having a cylindrical main body 5d having the same diameter as the main body 2c is connected and installed, and inside the main body 5d, as shown in FIG. A press ring portion 5f having a diameter T1 is formed. The length L5 of the press ring portion 5f in the directions of arrows A and B is longer than the sum of the length of one ring of the formwork 13 in the directions of arrows A and B, which will be described later, and the maximum stroke length of the ram 9a. There is. As shown in FIGS. 1 and 2, the press ring portion 5f has a plurality of concrete supply channels 5a.
The concrete supply path 5a is perforated in parallel to the directions of arrows A and B, and one end of the concrete supply path 5a opens to the side surface of the press ring section 5f, that is, the press ring section 5e, and the other end is connected to a concrete supply hose 30. is connected. Further, inside the press ring portion 5f, the gauge ring 11 is arranged as shown by the arrow A in contact with the inner circumferential surface 5c of the press ring portion 5f.
It is provided so as to be slidable in the B direction. Further, the gauge ring 11 is provided with a mold 13 assembled in an annular shape and connected in the left-right direction in FIG.

Further, a flange 5j is formed in an annular shape on the left side of the main body 5d of the rear shield 5 in FIG. 1, and the flange 5j is connected to the ram 9a of the pressure jack 9 via a pin joint 10. Furthermore, at the front end of the main body 5d on the left side in FIG.
As shown in FIGS. 1 and 3, a seal portion 5h is formed in a concentric cylindrical shape with an outer diameter slightly smaller than the outer diameter of the main body 5d, and the outer peripheral surface of the seal portion 5h is It is in contact with the seal member 2b. The length L4 of the seal portion 5h in the directions of arrows A and B is approximately the same as the length L3 of the seal portion 2d.

Since the shield 1 has the above configuration, when excavating the tunnel 15, the cutter 3 is rotated by driving the drive motor 3a.

The ram 6a of the digging jack 6 is made to protrude in the left-right direction in FIG. 1, and the cutter 3 is suppressed in the direction of the face 22, that is, in the direction of the arrow, through the partition wall 2a. Then, due to the pressing force,
The face 22 and the rotating cutter 3 are in contact with each other with a predetermined contact pressure, and at the same time the face 22 is excavated by the cutter 3, the front and rear shields 2.5 are propelled in the direction of the arrow to open the tunnel 15.
is formed behind the shield 1, that is, to the right in the figure.

As the tunnel 15 is formed in this way, it is necessary to construct the lining 20 in order to prevent the excavated ground 9 from collapsing, and the construction of the lining 20 is performed in the following steps. That is, when the shield 1 is dug in the direction of the arrow by a length Ll corresponding to one ring of the formwork 13, the ram 6a of the digging jack 6 is moved in the direction of the arrow B as shown in FIG.
The ram 9a of the pressurizing jack 9 remains almost fully protruding in the direction of arrow B, similar to the digging jack.

In this state, as shown in FIG. 5, the ram 6a is moved back by a distance IILI in the direction of the arrow. Then.

Gauge ring] 1 separates from the pouring surface 29A of the concrete/mortar 21 and the formwork 13A that were placed just before and moves in the direction of the arrow,
A distance ILl is formed between A and the gauge ring 11. Therefore, as shown by the imaginary line in Figure 1, a reinforcing member 12 made of punch plates, reinforcing bars, etc. is installed in the space, and a formwork 13B is assembled and installed in contact with the formwork 13A. , a primary concrete placement space 23 is formed between the gauge link 11, the press ring portion 5f, and the pouring surface 29A.

In this state, as shown in FIG. 6, the concrete supply pipe 25 is connected to the formwork 13B.
Concrete mortar 21 is placed in the primary concrete placement space 23 by the following steps.

Next, the cutter 3 is driven, and as shown in FIG. 7, the excavation jack 6 is also driven to project the ram 6a in the direction of arrow B, thereby starting to excavate the tunnel 15. At this time, the ram 6a takes a reaction force from the formwork 13 via the bottle joint 7 and the gauge ring 11, so that the front shield 2 digs in the direction of arrow A. When the front shield 2 digs in the direction of the arrow A, the rear shield 5 connected via the pressure jack 9 also starts digging in the direction of the arrow A together with the front shield 2, and as a result, the press ring portion 5f of the rear shield 5
After passing through, there is a circular secondary concrete placement space 2.
6 is formed. Therefore, at the same time as the first and rear shields 2 and 5 are excavated, concrete mortar 21 is injected from the concrete supply hose 30 into the secondary concrete placement space 26 from the discharge port 51 via the concrete supply path 5a.
The secondary concrete placement space 26 is filled with concrete mortar 21. In this way, the distance I corresponding to one ring
After excavating by JLI, the excavation via the excavation jack 6 is stopped.

Next, in this state, as shown in FIG. 8, the pressure jack 9 is driven to move the ram 9a backward by a distance ML2 in the direction of the arrow. Then, after being connected to the ram 9a, the main body 5d of the shield 5 also moves by a distance of 1% iL2 in the direction of the arrow A, so that it moves to the left side of the concrete mortar 21 placed in the secondary concrete placement space 26 in FIG. A space 31 is formed. Therefore, the concrete mortar 21 is injected into the space 31 to fill it in the same manner as in the injection into the secondary concrete placement space 26. In addition, at this time.

The protrusion of the ram 6a of the excavation jack 6 (i.e., the tunnel 1
It is also possible to shorten one working time by simultaneously performing the digging operation of step 5) and the retreat of the ram 9a of the pressurizing jack 9 (that is, the pulling operation of the rear shield 5 toward the front shield 2).

In this way, concrete 1...mortar 21 is placed in the secondary concrete placement space 26 over the distance fiL1+L2,
When the filling is completed, the pressure jack 9 is driven to project the ram 9a by a distance L2 in the direction of arrow B, as shown in FIG. Then.

The main body 5d of the rear shield 5 is connected to the arrow B through the pin joint 10.
By moving in the direction by a distance ML2, the press surface 5e of the press ring portion 5f presses the concrete mortar 21 placed in the secondary concrete placement space 26 to the right side in the figure.

Here, concrete is poured into the secondary concrete placement space 26.
1-.Since the process from placing the mortar 21 to protruding the ram 9a in the direction of arrow B takes a short time, the concrete/mortar 2 placed in the secondary concrete placing space 26
1 is not cured. Therefore, the unhardened concrete/mortar 21 pressed to the right side in FIG. 9 by the press ring portion 5f flows to the right side in the figure.

Then, the tail void 27 formed between the concrete mortar 21 and the ground 19, which was not completely filled when the concrete mortar 21 was poured into the secondary concrete placement space 26, is filled with the concrete mortar 21.
filled with. In addition, since a plurality of discharge ports 51 of the concrete supply path 5a are arranged in an annular shape on the press surface 5e of the press ring portion 5f, the concrete/mortar 2
1 is uniformly filled throughout the secondary concrete placement space 26, and the entire side surface of the annular press ring portion 5f serves as the press surface 5e, so that the concrete/mortar 21 is evenly filled. can be suppressed with a uniform pressure over the entire circumference of the press ring portion 5f, so that the filling operation of the tail void 27 is performed uniformly and in good condition around the entire circumference of the main body 5d.

In addition, in the above work process, as the ram 9a of the pressurizing jack 9 protrudes and retreats in the directions of arrows A and B, the main bodies 2c and 5d of the front and rear shields 2.5 move away or approach by the amount of protrusion and retreat L2. However, the connecting portion 17 of the main bodies 2c and 5d
As shown in Fig. 3, even when the main body 2 is as far away as possible,
The sealing members 2b, 2b attached to c
Since the interior space 16 inside the main bodies 2c and 5d is blocked off, the earth and sand from the ground 19 can be transferred from the connection part 17 to the interior space 16.
will not invade.

In this way, when the shield 1 digs one ring, the ram 6a of the digging jack 6 moves as shown by the arrow B.
The shape protrudes in the direction, and the construction of one ring's worth of lining 20 is completed. In addition, once the lining 2o for one ring is constructed, the lining 20 for the first ring is constructed, so as already mentioned, the ram G a of the excavation jack 6 is shown in Fig. 5. The gauge link 11 is moved in the direction of the arrow A by retreating in the direction indicated by the arrow as shown in FIG. Therefore, the splicing surface 29A stands on its own without collapsing, and the subsequent installation work of the reinforcing member 12 can be carried out smoothly.

In this way, as the shield 1 is excavated one ring at a time and the concrete/mortar 21 is placed in parallel, if for some reason a curved construction is to be performed, the front shield 2 is moved to the rear shield 5 in a predetermined position. Excavate the shield and place concrete and mortar in parallel using the same procedure as above, and complete the lining for 1 ring by 20 mm.
After constructing the front shield 2, the front shield 2 is further tilted in a predetermined direction with respect to the rear shield 5, and parallel work of shield excavation and concrete/mortar pouring is similarly performed.

By constructing the lining 20 for the next one ring and repeating the same operation as necessary, the desired curved cylindrical lining 20 is obtained.
can be constructed. At this time, the front and rear shields 2, 5
Although the main bodies 2c and 5d are bent at the connecting part 17, the sealing members 2b and 2b of the connecting part 17 are flexible, and the ram 9a of the pressure jack 9 and the ram 6a of the digging jack 6 are bent, respectively. Since it is pin-connected to the flange 5j and the gauge ring 11, it is possible to carry out reasonable curved construction while maintaining a state of isolation between the interior space 16 and the ground 19.

As the lining 20 is constructed as described above, the pouring surface 29 of the concrete/mortar 21 becomes...

As shown in FIG. 1, it is formed in a step-like manner.

(g) 8 Effects of the Invention As explained above, the present invention provides the main body 2 of the front shield 2.
c and the main body 5d of the rear shield 5 are provided relatively movably, and a pressure jack 9 is provided between the main bodies 2G and 5d.
The main body 2c of the front shield 2 and the main body 5 of the rear shield 5
d is connected, and a flexible sealing member 2b is provided at the connecting portion 17 of the main body 2C of the front shield 2 and the main body 5d of the rear shield 5 in a form that blocks the ground 19 and the interior space 16. and the rear shield 5 is provided with the rear shield 5.
A press ring portion 5f is formed integrally with the main body 5d, and a concrete supply path 5 is connected to the press ring portion 5f.
8 grade concrete supply means, its supply direction is indicated by arrow A.
, is provided in the shield excavation direction such as the B direction, and furthermore, a formwork support member such as a gauge ring 11 is provided inside the press ring portion 5f so as to be movable in the shield excavation direction, and the formwork support member and the front Since the excavation jack 6 is provided between the shield 2 and the main body 2c, the tail void 27 is effectively filled with concrete/mortar 21 by the press ring part 5f, resulting in a highly reliable tunnel that does not induce ground subsidence. Construction of the lining 20 becomes possible.

Further, the press ring portion 5f of the rear shield 5 is formed integrally with the main body 5d, and the shield 1 does not have a sliding part between the outer shell and the press ring, which is found in conventional shield excavators. Therefore, the shield 1 does not require precise machining accuracy and can be easily manufactured.

In addition, when constructing the lining 20 using the shield 1,
The excavation jack 6 is driven to move the formwork support member such as the gauge ring 11 in the excavation direction, the formwork 13 is installed on the formwork support member, and the formwork 13 is installed between the formwork 13 and the press ring part 5f. Concrete mortar 21 is placed in the formed primary concrete placement space 23, and then the excavation jack 6 is driven to move the main bodies 5d of the front shield 2 and the rear shield 5 in the excavation direction, and at the same time, Concrete mortar 2 is placed in the secondary concrete placement space 26 formed between the primary concrete placement space 23 and the ground 19.
1 is injected through a concrete supply means such as a concrete supply channel 5a, and furthermore, the pressure jack 9 is driven to draw the main body 5d of the rear shield 5 to the front shield 2, and at the same time, along with the pulling operation. Concrete/mortar 21 is injected into the space 31 between the primary concrete placement space 23 and the ground 19 created by the concrete supply means, and then the press ring part 5f is Since the structure is such that the unhardened concrete mortar 21 is moved while being pressed, it is possible to carry out the work of placing the concrete mortar 21 and digging the shield in parallel, and the work time is shortened by 5 hours. In addition, lining 2
Pour joint surface 2 of concrete mortar 21 at 0
Since the tunnel 9 can be formed into a step-like shape, it is possible to construct a tunnel 15 with a large water-stopping effect.

Further, when driving the excavation jack 6 to move the main bodies 5d of the front shield 2 and the rear shield 5 in the excavation direction,
When the front shield 2 is configured to be tilted with respect to the main body 5d of the rear shield 5, the shield 1 is bent at the connecting portion 17 and curved while keeping the ground 19 and the interior space 16 isolated. Construction is now possible and Shield 1
The scope of application will be expanded.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view showing an embodiment of the shield according to the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is the main body of the front and rear shields constituting the shield according to the present invention. 4 to 9 are process diagrams showing an example of constructing a lining using the shield according to the present invention. 1...Shield 2...Front shield 2b...Seal member 2c...Body 5...Rear shield 5a...Concrete Supply means (concrete 1
- Supply path) 5d...Main body 5f...Press ring portion 6...Drilling jack 9...Pressure jack 11...Model Frame support member (gauge link) 13・
...Formwork 1G...In-machine space 17...Connection section 19...Mound 20...Lining 1...Concrete Mortar 3...Primary concrete placement space 6...Secondary concrete placement space 1...Space

Claims (3)

[Claims] (1) In a shield consisting of a front shield having a cylindrical body and a rear shield having a cylindrical body, the body of the front shield and the body of the rear shield are relatively movable. At the same time, a pressure jack is provided between the bodies to connect the main body of the front shield and the main body of the rear shield, and a flexible A sealing member having a sealing member is provided to isolate the earth from the interior space of the machine, a press ring portion formed integrally with the main body of the rear shield is formed on the rear shield, and the press ring portion includes:
A concrete supplying means is provided whose supply direction is in the shield excavation direction, and further a formwork support member is provided inside the press ring part so as to be movable in the shield excavation direction, and the formwork support member and the main body of the front shield are provided. A shield consisting of a jack for digging in between. (2) When constructing a lining using the shield recited in claim 1, driving the excavation jack to move the formwork support member in the excavation direction; A formwork is installed in the mold, concrete mortar is placed in the primary concrete placement space formed between the formwork and the press ring part, and then the excavation jack is driven to remove the front shield and the rear shield. At the same time, concrete mortar is injected into the secondary concrete placement space formed between the primary concrete placement space and the ground through the concrete supply means, and further addition is performed. Driving the pressure jack to pull the main body of the rear shield to the front shield, and at the same time pouring concrete and mortar into the space between the primary concrete placement space and the ground created by the pulling operation. A method for constructing a lining using the shield, comprising: injecting concrete via the concrete supply means; and then moving the press ring part to press the injected uncured concrete/mortar. (3) When the excavation jack is driven to move the bodies of the front shield and the rear shield in the excavation direction, the front shield is tilted with respect to the body of the rear shield. A method for constructing a lining using the shield according to claim 2.