JPS6059399B2 - Expandable flexible pipe construction method underground - Google Patents

Description

[Detailed Description of the Invention] The present invention aims to provide an expandable and contractible underground conduit for the purpose of making it possible to construct a conduit that is stretchable and flexible at any point when constructing a conduit underground. This is related to the construction method of flexible culverts.

Conventionally, in the construction method of this kind of underground green odor construction, for example, multiple segments are connected to form a ring using shield construction, which is further constructed in the shape of a blue channel, and this segment ring is covered with concrete. The conventional construction method is to complete the blue culvert by carrying out construction work, but after construction, there are many changes in the ground, such as at places where the earth's crust has changed, under river embankments, at the entrance of culverts or at joints with shafts, and this behavior may cause problems. However, there is a flaw in that Aokyu becomes involuntary and cannot fulfill its role.

In addition, it is difficult to construct expandable and flexible conduits that can cope with these problems using conventional construction methods due to the complexity of the underground structure.
The construction cost was high due to the long construction period, and there were also problems with the effectiveness of the project after completion. Therefore, in view of these conventional deficiencies, the present invention involves intervening a rigid plate ring in the connecting portion of the segment ring to connect the next segment ring at a point where the ground may move as described above. When a certain interval (space) is formed in the rigid plate ring and an elastic sealant is injected and filled to give it expansion/contraction and flexibility functions, and when the segment ring is lined with concrete, the rigid plate ring is A certain space is formed in the area, and the elastic sealant is injected and filled before concrete is poured to give the green ditch elasticity and flexibility, so that it can follow the behavior of the ground. The purpose of this paper is to propose a construction method for expanding and contracting flexible blue channels that prevents damage and the like and maintains a completely watertight structure at all times. 1 Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in Figure 1, the shield equipment covers the outer periphery of the excavation shaft with a shield shell plate 1 installed underground, and excavation, shoring, and hoisting of earth and sand can be carried out safely under it. be. A cutting edge 2 is provided at the tip of this shell plate 1, and the shell plate 1 is propelled while digging.

Note that the surface other than the excavated portion moves forward while temporarily preventing the infiltration of earth, sand, silt, etc. by the retaining plate 3. At the rear of the blade mouth 2, attach the shield jack 4 to the segment 5 and the blade mouth 2.
and hold each. When the shell plate 1 of the shield advances to one ring, the lining of the segments 5 is assembled, and as the shell plate 1 of the shield advances to the next ring, the lining of the segments 5 is assembled, connected, and excavated. When reaching a change point of the earth's shell, a rigid plate 7 with an L-shaped cross section in contact with the shell plate 1 of the shield is connected between the segment rings 5a and 5b on the segment ring 5a side, and a rigid plate ring is formed. 7a, and on the other hand, a rigid plate 8 having a U-shaped cross section is coupled to the segment ring 5b side so as to fit into the inner periphery of the rigid plate ring 7a, thereby forming a rigid plate ring 8a. A rigid plate ring 8a is inserted into the inner periphery of the rigid plate ring 7a so as to overlap with each other, and partition walls are formed at both ends of this overlapping interval.

In this embodiment, rubber tubes 9a and 9b are inserted to form the partition wall, and air is pressurized into the rubber tubes 9a and 9b so that they are brought into close contact with the upper and lower surfaces, respectively, to form a space 10. By injecting an elastic sealant 11 into this space 10, the rigid plate rings 7a and 8a are flexibly bonded and tightly bonded to each other, thereby preventing the intrusion of ground water, etc., and providing a pressure-resistant structure sufficient against external pressure. It is. In addition, when constructing the elastic sealing agent 11, a segment ring 5a is applied to the inside of the shell plate 1 of the shield.
, 5b is located.
After the elastic sealant 11 has solidified, there is no particular effect even if it comes into direct contact with the excavated surface. Furthermore, segment rings 5a to 5n
When lined with concrete 12, between the segment ring ring 5a and the rigid plate ring 8a, the concrete 12
By forming spaces 13 with a certain interval without pouring the pipes, and injecting the above-mentioned elastic sealant 11 into the spaces 13, an expandable and contractible flexible part is created in this secondary lining conduit structure. There is something to build. Next, the method of injecting the elastic sealant 11 will be explained in detail with reference to FIG.

Bolts 14 and 1 are attached to the left and right segment ring rings 5a and 5b, respectively.
A space is formed between the outer rigid plate ring 7a and the inner rigid plate ring 8a by inserting the rigid plate rings 7a and 8a with an L-shaped cross section, which are connected to the outer peripheral side of the rigid plate ring 7a and the inner rigid plate ring 8a. Partition walls are formed at both ends of the section 10. In this embodiment, the partition wall is formed of a rubber tube, but the partition wall is not limited to this, and may be constructed using other methods. Rubber tubes 9a and 9b are inserted into both ends of the space 10, and the rubber tubes 9
Air is pressurized into spaces a and 9b for shielding, and this space 10
The elastic sealant 11 is injected into. When the elastic sealant 11 hardens and forms a close bond, the air is removed from the front rubber tubes 9a, 9b, and then the elastic sealant 11 is further injected into the rubber tubes 9a, 9b to ensure a complete seal. Furthermore, when lining the segment rings 5a, 5b... with concrete 12, a space 13 with a predetermined interval is formed between the segment rings 5a and the rigid plate ring 8a. Concrete 12 is poured so as to

The lower part of this space 13 is sealed with a sealing material 17, and an air vent hole 16 is provided in the concrete 12. By injecting and filling the space 13 with the elastic sealant 11, a stretchable and flexible pipe conduit is completed. As another example, as shown in FIG. 3, a case will be described in which an expandable and contractible culvert is constructed using concrete segments 6a and 6b. Left and right concrete segments 6a, 6b
Between each opposing end, a concrete segment 6
A rigid plate 7 with an L-shaped cross section is connected to the a side, and a rigid plate 8 with a U-shaped cross section is connected to the concrete segment 6b side, and the space 1 is
0 and 13, the elastic sealant 11 is injected and solidified, and the left and right concrete segments 6a, 6b are closely connected and constructed into an expandable and flexible pipe. The expandable flexible conduit of concrete segment 6 constructed using this construction method has the same extensible and flexible conduit as the conduit constructed using segment 5 described above, and maintains a sufficient water-stopping effect. be. Since the present invention relates to the above-mentioned construction method and structure, the elastic sealant to be filled is in the form of an amorphous solvent, so even if the ring ring and lining concrete at the connection part have a complicated shape, the Because it is injected in large quantities, its adhesive strength is extremely strong, and it exhibits its full expansion and contraction effect.

Moreover, since this construction method uses the above-mentioned elastic sealant, it can be easily constructed, and furthermore, it is simple and has the advantage that no special skill is required. After construction, the pipe always has a certain amount of flexibility, and even if unexpected behavior occurs underground due to ground movement, the pipe can flexibly expand and contract.
It will not be damaged. The construction method of the present invention is extremely reasonable, including construction costs, in order to meet the conditions for constructing underground pipes, and a reliable expandable and flexible structure can be maintained for a long time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view illustrating the construction of an embodiment according to the present invention;
FIG. 2 is a cross-sectional view of a joint in the same embodiment, and FIG. 3 is a cross-sectional view of a joint in another embodiment. Code explanation, 1...Shell plate, 2...Blade mouth, 3
...Mountain retaining plate, 4...Wooled snail, 5...Segment, 5a, 5b...
Segment ring, 6, 6a, 6b... Concrete segment, 7, 8... Rigid plate, 7a, 8a...
...Rigid plate ring, 9a, 9b...Rubber tube, 10...Space, 11...Elastic sealant, 12...Concrete, 13... Space portion, 14...Bolt, 16...Air vent hole, 17...Sealing material.

Claims (1)

[Claims] 1. In underground shield work, connect rigid plate rings with L-shaped and U-shaped cross sections to the joints of arbitrary opposing segment rings, overlap the rigid plate rings at a constant interval, An elastic sealant is injected into this interval to make them adhere tightly, and when the segment ring is lined with concrete, a space with a constant interval is formed in the overlapping part of the rigid plate ring. A method for constructing an expandable flexible pipe conduit underground, characterized in that the elastic sealing agent is injected into the space to construct an expandable and flexible pipe conduit.