JPH0314996B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to coating the outer periphery of a tunnel lining segment constructed by a shield method with an impermeable membrane such as waterproof vinyl, or a box culvert laying conduit construction method. This invention relates to an underground structure assembly method in which coating the outer periphery of a box culvert with an impermeable membrane and assembling underground structure objects such as segments and box culverts can be carried out in parallel.

[Conventional technology] Taking the shield construction method as an example, the current shield construction method cuts the tunnel face with a cutter at the front end of the shield excavation machine, and excavates the shield using the thrust of the shield jack at the rear while holding the face. As the machine moves forward, the segments are assembled at the rear of the shield excavator to complete the lining, and the space between the lining and the surrounding ground is injected and filled with backfilling material. That's what I do.

However, in the above-mentioned shield construction method, water often leaks into the tunnel from the joints or cracks of the segments during or after construction, and for this reason, water leakage prevention work has traditionally been required at the time of or after the completion of the shield construction. Furthermore, when groundwater overflows into the empty space between the segment and the ground, problems arise such as the backfilling material injected into the tail void may be diluted by the groundwater.

In order to solve this problem, recently, an impermeable membrane made of vinyl, polyethylene, etc. is placed in the empty space between the segment and the ground as the shield tunneling machine is propelled to cover the entire circumference of the segment. things are being done.

If the entire circumference of the segment is covered with an impermeable membrane and a backing material is filled between the impermeable membrane and the segment, the impermeable membrane prevents groundwater from reaching the outer surface of the segment and prevents the joint of the segment. The problems mentioned above, such as water leakage from the parts, will no longer occur.

A conventional device for covering the outer periphery of a segment with an impermeable membrane such as vinyl, as shown in FIG. A cylindrical impermeable membrane d is folded and stored in the permeable membrane storage part c, and can be pulled out from the rear end of the impermeable membrane storage part c along the inner surface of the shield frame b to propel the shield tunneling machine a. An impermeable membrane d is drawn out into a tail void g between the accompanying segment e and the ground f, so as to cover the entire circumference of the segment e. In the figure, h is a tail seal and i is a shield jack.

Further, as another device for covering the outer periphery of a segment with an impermeable membrane, there is a waterproof sheet stretching device for tunnel construction disclosed in Japanese Patent Application Laid-Open No. 16700/1983.

[Problems to be Solved by the Invention] However, in the former of the above-mentioned conventional impermeable membrane coating devices, since the impermeable membrane storing section is provided in the shield frame b of the shield tunneling machine a, the following problem occurs. There are some drawbacks.

The tail void g is larger than that of a normal shield by the amount of the water-impermeable membrane housing portion c. That is,
Since the impermeable membrane housing part c is provided between the outer surface of the segment e and the shield frame b, the outer diameter of the shield frame b increases by the thickness of the water impermeable membrane housing part b. Therefore, the amount of excavation,
As the amount of waste soil increases, the amount of backfill required for design increases.

From the above, the thickness of the impermeable membrane storage part c cannot be increased too much, and since the impermeable membrane storage part c is incorporated inside the shield frame b of the shield tunneling machine a, the size of the impermeable membrane storage part c is Due to certain restrictions, it cannot take up a large amount of space. Therefore, the impermeable membrane d
It is not possible to increase the amount of storage.

Since the impermeable membrane storage part c is provided inside the shield excavator a, the structure of the installation location of the impermeable membrane d becomes complicated due to the conflict with the equipment of the main body of the shield excavator a. Part c
It had problems, such as the time it took to incorporate it into the system.

Furthermore, among the conventional techniques, in the latter case, due to the structure of the waterproof sheet stretching device, segments etc. cannot be assembled until the waterproof sheet stretching device is removed.
This had the problem of poor work efficiency.

The present invention seeks to solve the various drawbacks of such conventional devices.

[Means for Solving the Problems] The present invention provides an impermeable membrane installation space and an underground structure assembly space surrounded by the already installed impermeable membrane at a position in front of the already assembled underground structure. , Arrange an impermeable membrane having an appropriate length in the impermeable membrane installation space, join the impermeable membrane to the already installed impermeable membrane, and sequentially install the underground structure by using the joined impermeable membrane. The underground structure assembly method is characterized in that the outer periphery of the underground structure is covered and the underground structure is assembled in the underground structure assembly space in parallel with the laying of the impermeable membrane.

[Operation] Therefore, an impermeable membrane is laid during the assembly of the underground structure, the underground structure is assembled within the laid impermeable membrane, and as a result, an impermeable membrane is formed around the outer periphery of the assembled underground structure. coated.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

In Fig. 1, 1 is a shield tunneling machine;
2 is a shield frame of the shield excavator 1, 3
is a shield jack having a stem 3'; 4 is a tail seal; 5 is a segment; 6 is an impermeable membrane laid on the outer periphery of the segment 5 and covers the segment 5; 7 is the impermeable membrane 6 and the ground 8 This is a backfilling material injection device that injects backfilling material 9 into the tail void formed between the two. Further, the length of the stem 3' is determined to ensure a segment assembly space 10 and an impermeable membrane installation space 12.

In such a shield excavator 1, a segment assembly space 10 for assembling the segments 5 and an impermeable membrane installation space 12 are formed at the rear position of the shield jack 3, and the segments 5 are assembled in the segment assembly space 10. In parallel with the assembly of the segments 5, a band-shaped impermeable membrane 6' having a unit length slightly longer than the axial length of the segments 5 is placed in the impermeable membrane installation space 12. Both ends in the circumferential direction of the permeable membrane 6' are wrapped (wrap portion The parts are then wrapped (wrapped part Y) and joined by the joining device 11.

After the impermeable membrane 6 is laid in the impermeable membrane installation space 12 and the segments 5 are assembled in the segment assembly space 10, the shield excavator 1 is caused to excavate by the shield jack 3. In this way, the segment assembly space 10 and the impermeable membrane installation space 12 are again formed at the rear position of the shield jack 3, so the impermeable membrane installation work and the joining work of the impermeable membranes 6' and 6 are carried out in the same manner as described above. Then, the assembly work of segment 5 is performed, and the same work is repeated sequentially thereafter.

In the above embodiment, a band-shaped membrane was used as the water-impermeable membrane 6' before coating, but a ring-shaped membrane may also be used. Moreover, the joining device 11
For example, an ultrasonic oscillator, a high-frequency oscillator, a heater, or the like can be used.

With this method, the impermeable membrane installation space 12 can be formed in front of the segment assembly space 10, so that the impermeable membrane installation space 12 can be formed in front of the segment assembly space 10. The work of joining and laying the impermeable membrane 6' can be done simultaneously in the installation space 12, which is extremely efficient.

It should be noted that the present invention is not limited to the above-described embodiments; for example, the water-impermeable membranes may be joined using adhesives or adhesive tapes, regardless of the joining device, or may be performed using a box other than the shield method. The same method can be applied to underground structure construction methods such as the culvert laying pipe construction method.

[Effects of the Invention] As explained above, according to the present invention, by adopting the shield construction method, the box culvert laying conduit construction method, etc., the outer periphery of an underground structure can be covered and leakage into the interior can be reliably prevented. be able to.

In particular, when the shield method is adopted, there is no need to provide a conventional impermeable membrane storage box inside the shield frame, so it takes time and effort to increase the outer diameter of the shield frame and incorporate the impermeable membrane. This is extremely advantageous.

Furthermore, by providing both the underground structure assembly space and the impermeable membrane installation space at the same time, segment assembly, impermeable membrane bonding, and installation work can be performed at the same time, improving work efficiency.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the underground structure assembly method of the present invention, and FIG. 2 is an explanatory diagram of a conventional example. 1 is a shield excavator, 5 is a segment, 6,
6' is a water-impermeable membrane, 10 is a segment assembly space, and 12 is a water-impermeable membrane installation space.

Claims (1)

[Claims] 1. An impermeable membrane installation space and an underground structure assembly space surrounded by the already installed impermeable membrane are provided in front of the already assembled underground structure, and have an appropriate length for the impermeable membrane installation space. Arranging an impermeable membrane, joining the impermeable membrane to an already laid impermeable membrane, sequentially covering the outer periphery of the underground structure object with the joined impermeable membrane, and laying the impermeable membrane. An underground structure assembly method characterized in that, in parallel, the underground structure object is assembled in the underground structure object assembly space.