JPS6235187A - Method of floating preventive construction of piping - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a piping floating prevention method.

2. Description of the Related Art When a pipe is laid in an underground passage such as a shield or tunnel, it is common to inject air mortar into the gap between the pipe and the passage. By the way, when pouring air mortar, the tube tends to float due to buoyancy, so it is necessary to prevent this.

For this reason, conventionally, as shown in FIG.
The pipe 3 is laid on top of the pipe 3, and the floating prevention water 4 is arranged between the upper surface of the pipe 3 and the inner surface of the passage 1. Then, the air mortar 6 in the tank 5 is transferred to the pump 7 and the pressure pipe 8. The gap between the tube 3 and the passage 1 is filled through the tube. 9 is a drain pipe, and 10 is support water for preventing the pipe 1 from shifting laterally.

Problems to be Solved by the Invention However, with such conventional construction methods, work efficiency is poor because it takes time and effort to install the floating prevention water 4, and this floating prevention water 4 cannot be installed when there is a large space. However, there is a problem in that it is difficult to install if the space is small. Furthermore, since the floating prevention water 4 supports the upper surface of the pipe 1 almost at a point, there is no problem with a pipe 1 of small diameter and high rigidity, but in the case of a pipe 1 of a large diameter and low rigidity, unreasonable concentrated stress is applied to the pipe 1. There is also the problem that it is easy to occur.

Therefore, the present invention solves these problems and provides a piping system that is easy to work with, can be applied even when the space between the pipe and the passage is small, and is free from the risk of generating large concentrated stress on the pipe. The purpose is to propose a construction method to prevent floating.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention lays a pipe in a passage such as a shield or tunnel, places a bag at an appropriate position on the top of the pipe, and fills the bag with a filling material. The gap between the upper surface of the pipe and the passage is filled by injecting it, and then air mortar is injected into the entire gap between the pipe and the passage.

By doing this, it is possible to reliably prevent the tube from floating by simply placing the bag on the top surface of the tube and injecting the filler into the bag. Furthermore, even if the space between the tube and the passageway is small, as long as the bag can be placed, the tube can be supported by subsequent injection of filler material. Furthermore, since the tube can be supported by the surface of the bag,
Stress is dispersed and concentrated stress is prevented from occurring.

EXAMPLE An example of the present invention will be described below. In FIG. 1, 11 is a passage such as a shield or a tunnel, and a pipe 12 is laid inside the passage. The tube 12 has a socket 13 at one end and an insertion port 14 at the other end, and the socket 13 and the socket 14 are joined to each other, so that the pipe 12 is disposed in the longitudinal direction within the passage 11. In addition, the socket 13 is supported by a sandbag 15, which allows the pipe 12 to
is placed floating above the inner surface of the passageway 11.

Rubber bags 16 are attached to the tube 12 using strings 17, etc., and a plurality of bags 16 are arranged in the length direction of the tube 12, and are arranged so as to cover the upper surface of the tube 12. It is located in A soft vibrator 18 such as a rubber pipe is connected to the bag 16 so that air mortar 20 as a filler in a tank 19 can be injected into the bag 16 by a pump 21.

In the piping work, a passage 11 is first formed by excavation work or the like, and a pipe 12 to which a bag 16 has been previously attached is laid within this passage 11. In addition, as mentioned above, sand bags 15
The tube 12 is kept floating above the inner surface of the passageway 11 by using.

After the pipe 12 has been laid, air mortar 20 is poured into the bag 16 as shown in FIG. Then, the bag 16 is inflated by the air mortar 20 to close the gap between the upper surface of the tube 12 and the passage 11, and its outer surface contacts the inner surface of the passage 11. When the air mortar 20 is cured in this state, the tube 12 will be firmly fixed within the passage 11. At this time, even if the space between the pipe 12 and the passage 11 is small, as long as the bag body 16 in an uninflated state before the air mortar 20 is injected can be placed, the pipe 12 and the passage 11 can be
2 can be supported and fixed. Further, since it is only necessary to inject the air mortar 20 into the bag body 16 and harden it, the work is easy.

After that, air mortar is injected into the entire gap 22 between the pipe 12 and the passage 11. Then, this air mortar exerts a buoyant force on the tube 12, but this buoyant force is caused by the air mortar 2.
Since the water is transmitted to the inner surface of the passage 11 through the bag body 16 in which 0 is injected and hardened, floating of the tube 12 is reliably prevented.

Furthermore, since the tube 12 can be supported by the bag 16 on its surface, stress can be dispersed, and therefore, unreasonable concentrated stress can be prevented from acting on the tube 12. For this purpose, it is desirable that the bag 16 be arranged in as wide a range as possible in the circumferential direction of the tube 12, and as shown in FIG. 2(b), the angular range (θ) in the circumferential direction is at least 240 It is preferable that the temperature is above 100%. Further, the filling material injected into the bag body 16 is not limited to the above-mentioned air mortar 20, but any suitable material can be used as long as it is a material that hardens after being injected.

Effects of the Invention As described above, the present invention has good workability, can be applied to small spaces, and can prevent the occurrence of unreasonable concentrated stress because the buoyant force acting on the pipe is received by the surface. .

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a state in which air mortar is injected into the bag body in FIG. 1,
FIG. 3 is a diagram showing a conventional example. 11...Passway, 12...Pipe, 16...Bag body, 20
... Air mortar (filling material), 22 ... Gap, Agent Yoshihiro Morimoto Figure 1 (Shin)
(C-n Figure 2 (b-n)

Claims (1)

[Claims] 1. Lay a pipe in a passage such as a shield or tunnel, place a bag at the appropriate place on the top of the pipe, inject a filler into the bag to close the gap between the top of the pipe and the passage, and then A piping floating prevention method characterized by injecting air mortar into the entire gap between the pipe and the passage.