JPH0477767B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for correcting uneven settlement of buried pipes such as sewer pipes.

(Prior Art) Conventionally, the following two methods have been adopted when laying pipes in soft soil or extremely soft soil.

Flexible pipes such as hard vinyl chloride pipes, reinforced plastic pipes, and steel pipes are used for the main body of the pipes, and they are laid on sand foundations constructed to distribute the load. A method to avoid the occurrence of discontinuities at pipe joints, such as in the case of pipe fittings, and to ensure the minimum flow that maintains functionality.

A method to prevent uneven settlement as much as possible by laying rigid pipes on flexible structure foundations such as ladder-body foundations made of pine logs in the shape of cross-sections and torii foundations reinforced with wooden piles.

However, in recent years, in search of reinforcement and economy for pipes, methods have been developed, such as () increasing the rigidity by placing reinforcement in the concrete foundation, or () creating a foundation that combines a reinforced concrete foundation with strong piles that reach the supporting ground. The construction method is used.

(Problems to be Solved by the Invention) However, the first and second methods cannot completely prevent uneven settling of buried pipes, and the third method has limitations in terms of strength. It is not a drastic countermeasure, and furthermore, the fourth method is not economical, and there is a high possibility that trouble will occur on the ground surface or the pipe body when the entire surrounding ground is consolidated and settled in the future.

As mentioned above, in the conventional method, uneven settlement of buried pipes cannot be fundamentally solved by ordinary methods.
When uneven settlement occurs on a scale that poses a problem for management, pipes are replaced.

As described above, uneven settlement of buried pipes is a problem that cannot be avoided unless the pipes are installed on bedrock or compacted soil.

(Means for Solving the Problems) The present invention was proposed in view of the above-mentioned circumstances, and consists of installing air bladders at predetermined intervals between the lower surface of a pipe laid on a reinforced concrete foundation and said foundation. is installed, and when the uneven settlement of the pipe occurs, pressurized fluid is injected from inside the manhole into the air bladder in the uneven settling part to lift the pipe, and then the lower surface of the pipe and the foundation are removed. This method of correcting uneven settlement of a buried pipe is characterized by filling and hardening a filling material from inside the manhole into the gap between the manhole and the upper surface, and its purpose is to completely correct uneven settlement of the buried pipe. It is an object of the present invention to provide a construction method for correcting uneven settlement of buried pipes, which solves the problems of the conventional construction methods in a rational manner.

(Function) According to the present invention, when laying a pipe on a reinforced concrete foundation, air bladder bodies are interposed at predetermined intervals between the lower surface of the pipe and the foundation, and When uneven subsidence occurs, a manhole is used to inject pressurized fluid from inside the manhole into the air sac in the uneven subsidence section, inflating the air sac, and the expanded air sac opens the culvert. Raise it to an appropriate position, and fill the void thus created between the culvert and the foundation with filler from inside the manhole in the same manner as pressurized injection of pressurized fluid into the air bladder, and let it harden. This is to correct uneven settlement of pipes.

(Effects of the Invention) According to the present invention, it is possible to correct uneven settlement of buried pipes with a simple configuration, and as long as the expansion capacity of the air bladder is within the range, multiple correction measures can be taken in the future. becomes possible.

In addition, during backfilling of pipes, the air bladder is inflated to some extent to counteract the large instantaneous applied earth pressure, which is considered to be the main cause of pipe damage problems. It is possible to maintain safety.

(Example) The present invention will be described below with reference to the illustrated embodiments.

1 is a reinforced concrete pipe, and when it is laid on a reinforced concrete foundation 2, a reinforced rubber or the like is installed between the pipe seating part 2a with an arcuate cross section provided on the upper surface of the foundation 2 and the lower surface of the pipe 1. The constructed pressure-resistant air bag 3 is interposed. In the figure, 4 is a manhole, 5 is an excavation line, and 6 is a backfilling part. (Figures 1 and 2
(Refer to the figure) If uneven settlement occurs in the pipe 1 as shown in Fig. 3, it is buried in the ground in advance, and one end is connected to each of the air sacs and the other end is connected to the manhole 4. Pressure fluid is filled in through an injection pipe (not shown) to inflate the air bag 3, and the air bag 3 lifts the pipe 1 until it is located on the same line as the installation position. In this state, from inside the manhole 4 or from inside the pipe culvert 1, the pressure fluid is inserted into the gap created between the pipe pipe 1 and the pipe seat 2a on the foundation 2 via the injection pipe in the same manner as when the pressure fluid is sealed. resin,
The uneven settling of the pipe 1 is corrected by injecting and solidifying a liquid filler 7 such as a cement type filler.

According to the method of the above embodiment, uneven settling of the buried pipe 1 can be corrected with such simple construction, and after the correction work, the air sac 3 can be temporarily deflated and reused. In addition, during backfilling work of pipe culvert 1, by inflating the air bladder 3 to some extent, it is possible to counteract the additional earth pressure that momentarily acts greatly on pipe culvert 1. This can prevent damage to the pipe conduit 1 due to added earth pressure.

In addition, if uneven settlement of the pipe body is predicted in each construction method such as shield, mini-shield, and propulsion method, it should be noted that if uneven settlement is expected, it should be treated by a method such as attaching an air bladder to the face or the lower part of the pipe in advance. Therefore, it is possible to correct uneven settlement.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various ways without departing from the spirit of the present invention. .

[Brief explanation of drawings]

The drawings show the steps of an embodiment of the uneven settlement correction method for buried pipes according to the present invention, and FIGS. 1 and 2 are a longitudinal cross-sectional view and a longitudinal side view, respectively, showing the state of the buried pipes when they are laid. FIG. 3 is a longitudinal cross-sectional view showing a state in which uneven settlement of a pipe has occurred, and FIGS. 4 and 5 are a longitudinal cross-sectional view and a longitudinal cross-sectional side view, respectively, showing the state of uneven settlement correction work. 1... Pipe, 2... Foundation, 3... Air sac, 7...
...Filling material.

Claims (1)

[Claims] 1 Air bladders are interposed at predetermined intervals between the bottom surface of a pipe laid on a reinforced concrete foundation and the foundation, and when uneven settlement of the pipe occurs, the air bladders in the uneven settlement section are filled with air inside the manhole. After the pipe is lifted up by injecting more pressurized fluid, a filling material is filled and hardened from inside the manhole in the gap created between the lower surface of the pipe and the upper surface of the foundation. Uneven settlement correction method for buried pipes.