JP3724734B2 - Underground cavity filling method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an underground cavity filling method, and more particularly to an underground cavity filling method for effectively filling an underground cavity generated by the outflow of earth and sand from a defective portion such as a sewer pipe and reinforcing the ground.
[0002]
[Prior art]
In the ground under the road, various pipes such as waterworks, sewage, city gas, electric power, communication, etc. are often buried, especially when the sewage system pipes are damaged, While leaking from the damaged part, earth and sand in the ground may be lost, and a cavity may be generated in the ground. If such a cavity is left unattended, not only will the scale increase and the road surface will collapse, but it will be a barrier to traffic as well as causing damage to various structures.
[0003]
Therefore, when a road surface abnormality is discovered, the occurrence of underground cavities is first suspected, the pavement surface is removed, the underground structure is investigated, and the damaged pipe is repaired by removing soil and sand. It was normal to perform restoration work by filling the earth and sand and paving again. However, this method of excavation from the ground takes a long period of time and costs due to the need to carry back a large amount of sand and then backfill, resulting in obstacles to traffic and an environment caused by noise and dust. There is also a problem of contamination.
[0004]
Therefore, in order to avoid the occurrence of various problems as described above, the present inventor drilled a small-diameter hole instead of excavating earth and sand from the ground, and directly through this hole to the underground cavity portion. We have invented a method for filling and stabilizing earth and sand from the ground, and have applied for a patent. In addition, if a small-diameter hole is drilled from the ground, there is a risk of damaging pipes and structures installed in the ground. Therefore, the earth and sand are generated in the underground cavity near the buried pipe via the buried pipe. We have invented a new construction method that fills etc. and has applied for a patent. However, with this new construction method, temporary work such as partial suspension of buried pipes or flow path changes may be necessary during the repair work, and there are limits to reducing traffic obstruction and environmental pollution. It was.
[0005]
By the way, according to the recent survey on the underground cavities as described above, more than two-thirds of the causes of the occurrence are the defects generated in the sewage installation pipe connected to the sewage main, the sewage main and the installation pipe. It was proved that the defect occurred in the branching portion. Therefore, more than two-thirds of the generated underground cavities exist in positions close to the sewage attachment pipe.
[0006]
[Problems to be solved by the invention]
As described above, if the generated underground cavity is in a position close to the sewage installation pipe, if the underground cavities can be filled through the sewage installation pipe, it will be possible to stop using the sewage main pipe or change the flow path. The impact on the environment and the labor and time required for the work can be greatly reduced. Therefore, when filling the underground cavities, the sewage can be reduced substantially without impairing the functions of the sewage mains without damaging the underground structures as in the invention technology of the previous application. It intends to provide an underground cavity filling method using a mounting pipe.
[0007]
[Means for Solving the Problems]
The underground cavity filling method of the present invention that can achieve the above-described object is to fill the underground cavity generated in the vicinity of the sewage attachment pipe with the position, shape, and scale of the underground cavity using an investigation device. a step of investigating the position of the mounting tube closest upper under cavity該地, the mounting tube wall drilling device from the top chambers of the mounting tube mounting pipe is introduced into outermost access position of the mounting tube Forming an opening and drilling a through hole from the opening to the underground cavity; supplying and filling an aggregate mixture into the underground cavity through the through hole; and passing the through hole by the aggregate mixture. And a step of repairing the opening portion of the attachment pipe after sealing.
[0008]
In the above-mentioned underground cavity filling method, the aggregate mixture is a slurry-like composition composed of gravel, sand, soil or other aggregate components for filling and water , so as to facilitate the filling of the cavity. Preferably, the aggregate mixture that seals the through-hole with it is a coagulant blended with a coagulant capable of binding the aggregate , so that the stabilization of the aggregate filling structure is accelerated, and the safety is further improved. Moreover, the filling work of the underground cavities can be carried out reliably.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the underground cavity filling method of the present invention will be described with reference to the drawings.
In the figure, reference numeral 1 denotes a sewage main pipe buried in the ground G under the road, and a part of the sewage main pipe 1 is provided with attachment pipe branch portions 1a at appropriate intervals. On the other hand, rainwater tanks are installed at appropriate intervals alongside or below the side ditches of the road, and sewage tanks that receive miscellaneous wastewater discharged from homes and the like on the sidewalks. And the upper end of the buried sewage attachment pipe 2 is opened in the side wall of the upper ridge 3 such as rainwater sewage and sewage basin, and the lower end of the sewage attachment pipe 2 is connected to the attachment pipe branch 1a. Combined to communicate with the sewage main 1.
[0010]
The sewage mounting pipe 2 is often formed by connecting a plurality of ceramic pipes. However, the pipe body is not suitable for laying water pipes or road pavements due to uneven pressure. It may be damaged, or a deviation or a gap may be generated in the attachment pipe branching portion 1a, the joint portion between the ceramic pipes, or the connection portion with the upper rod 3 or the like. When such a defective part 2a of the pipe line is generated, as shown in FIG. 1, groundwater having a pressure in the ground G flows into the pipe through the defective part 2a, and earth and sand in the ground also flows into the pipe together with the underground part. The cavity 4 is easily generated.
[0011]
The underground cavity 4 generated in this way gradually grows as the surrounding earth and sand collapses and flows out, and develops upward as shown in FIG. 2. It is necessary to strive for early detection. Then, when the underground cavity 4 is discovered, the location and scale of the underground cavity 4 are investigated at an early stage, and sewage pipes, water supply pipes, gas pipes, power cables, communication cables, etc. are laid nearby. Investigate the arrangement of grooves.
[0012]
From the result of this investigation, when it is determined that the underground cavity 4 has occurred in the vicinity of the sewage installation pipe 2, further investigation is carried out according to the method of the present invention, and the upper part of the underground cavity 4 and the sewage installation pipe 2 are closest. Then, the planned opening position 2b, which is considered appropriate for providing the through hole 5 reaching the underground cavity 4 from the sewage attachment pipe 2, is selected. Thereafter, for example, a fiberscope or a TV camera is introduced into the sewage attachment pipe 2 from the upper side of the ridge 3 and the vicinity of the planned opening position 2b is observed, and then the planned opening position 2b on the inner wall surface of the sewage attachment pipe 2 is determined. To do.
[0013]
Next, if necessary, a guide wire or the like is introduced into the sewage attachment pipe 2 from the upper side 3, and the tip of the guide wire or the like is drawn to the ground via the sewage main pipe 1 and its downstream manhole. Secure. Then, for example, the packer device A is introduced and fixed below the planned opening position 2b in the sewage attachment pipe 2 from the side of the upper ridge 3 having an opening of about 50 cm × 30 cm and a depth of about 70 cm, and further provided with a packer. After the pipe wall drilling machine B is introduced in the same manner and fixed to be opposed to the planned opening position 2b accurately, the pipe wall drilling machine B is controlled from the ground on the upper side 3 to control the sewage mounting pipe 2 An opening 5a is formed in the inner wall, and the tube wall drilling machine B is recovered.
[0014]
Subsequently, a fiberscope, a TV camera, etc. are introduced from the upper side of the ridge 3 to observe the state of the opening 5a, and by using an underground structure exploration by ultrasonic waves or radio waves from the ground, and further from the opening 5a. The necessity of excavation of the through hole 5 reaching the underground cavity 4 is investigated. If excavation is necessary, the direction and length of the through-hole 5 are investigated, and the through-hole excavator is introduced into the sewage mounting pipe 2 in the same manner as described above, but the through-hole 5 has already been formed. If so, it is immediately ready for the cavity filling operation.
[0015]
In the underground cavity filling method of the present invention, as a through-hole excavating apparatus for excavating the through-hole 5 from the sewage mounting pipe 2 to the underground cavity 4, for example, an apparatus of a system that scrapes the face surface by rotating a cutting blade, or high-pressure water is used. It is possible to select and use an appropriate excavator such as a device that sprays on the face and digs up.
[0016]
In this way, after the through hole 5 leading from the opening 5a of the sewage mounting pipe 2 to the underground cavity 4 can be secured, the aggregate feeding pipe C extended from the aggregate feeding apparatus installed on the ground is connected to the upper ridge 3 It arrange | positions so that it may reach to the inside of the sewage attachment pipe 2. At that time, it is desirable to install the aggregate feeding pipe C so that the tip of the aggregate feeding pipe C reaches the underground cavity 4 through the through hole 5. The aggregate feeding device is preferably composed of an aggregate mixture preparing device, an aggregate mixture feeding pump, and an aggregate feeding tube C.
[0017]
The aggregate mixture used to fill the underground cavity 4 is preferably a slurry-like composition containing aggregate components such as gravel, sand, and earth and water, but if desired, an aggregate-binding component is blended. can do. In order to increase the filling efficiency, it is desirable to increase the fluidity of the composition and keep the amount of water low. The pipe diameter is reduced especially when the mixing resistance of granular lightweight foam aggregate, clayey soil, sludge incineration ash, etc. is adjusted, or by reducing the feeding resistance of the aggregate mixture by using a water reducing agent. Using the aggregate feeding pipe C that is small and easily bent, the underground cavity 4 can be efficiently filled.
[0018]
As described above, as soon as the aggregate feeding device is ready, the aggregate feeding pipe C is disposed in the sewage attachment pipe 2, and then feeding of the aggregate mixture is started. The aggregate mixture to be filled first is preferably deposited at the bottom of the underground cavity 4 and hardly flows out. For example, it is preferable to use a mixture containing a binder or the like. Then, it is preferable that the underground cavity 4 is sequentially filled with the aggregate mixture 4a, and finally the top space of the underground cavity 4 is filled with the lightweight and expandable aggregate mixture.
[0019]
After filling the underground cavity 4 in this way, the process proceeds to filling of the through hole 5 portion. The aggregate mixture used at this time is preferably a coagulable aggregate mixture. After the opening 5a formed in the sewage attachment pipe 2 is sealed by filling the through-hole 5 portion, the aggregate feed pipe C is collected and the aggregate feed device is withdrawn. Then, the packer device A is recovered to discharge the aggregate mixture remaining in the sewage mounting pipe 2, and after further cleaning the sewage mounting pipe 2, the wall covering method or the like is applied to the opening 5a to form the lining 5b. To complete the filling of the underground cavity 4.
[0020]
Since the underground cavity filling method of the present invention is constructed using a sewage mounting pipe that is relatively small in diameter and markedly bent, the observation device and the working device to be introduced into the pipe must be short, and therefore, the bone It is also appropriate to use a material feeding tube that is small in diameter and light in weight. In addition, since the work at a position close to the ground surface or the ground surface increases, the amount of materials to be handled, the amount of movement of work devices, and the amount of work associated with the handling thereof are expected to be greatly reduced.
[0021]
【The invention's effect】
In the underground cavity filling method of the present invention, since the underground cavity is filled with aggregate etc. using the sewage attachment pipe existing in the vicinity of the generated underground cavity, the man-hours and the construction period are shortened, and the road surface is damaged. In addition, there is almost no fear of environmental pollution due to construction, and the construction cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a state where a cavity is generated in the ground.
FIG. 2 is a cross-sectional view of a state in which an underground cavity is developed.
FIG. 3 is an explanatory diagram of a situation in which a packer device A for a sewage attachment pipe is installed in the underground cavity filling method of the present invention.
FIG. 4 is an explanatory diagram of a situation where an opening is formed in a sewage attachment pipe in the underground cavity filling method of the present invention.
FIG. 5 is an explanatory diagram of a situation where a cavity is filled in the underground cavity filling method of the present invention.
FIG. 6 is an explanatory diagram of a completed state of cavity filling in the underground cavity filling method of the present invention.
[Explanation of symbols]
G Ground A Tube wall drilling machine B Tube wall drilling machine C Aggregate feed pipe 1 Sewage main pipe 1a Mounting pipe branching section 2 Sewage mounting pipe 2a Defect 2b Planned opening position 3 Upper wall 4 Underground cavity 4a Aggregate mixture 5 Through-hole 5a Opening 5b Lining

Claims (3)

A step of investigating the position, shape and size of the underground cavity and the position of the attachment pipe closest to the upper part of the underground cavity by using an investigation device when filling the underground cavity generated in the vicinity of the sewage attachment pipe A mounting pipe wall drilling device is introduced from the upper side of the mounting pipe to the closest position of the mounting pipe to form an opening in the mounting pipe , and a through hole communicating from the opening to the underground cavity is drilled. A step of supplying and filling an aggregate mixture into the underground cavity through the through hole, and a step of repairing the opening portion of the attachment tube after sealing the through hole with the aggregate mixture. An underground cavity filling method characterized by that.   2. The underground cavity filling method according to claim 1, wherein the aggregate mixture is a slurry-like composition containing an aggregate component for filling a cavity and water.   The underground cavity filling method according to claim 1 or 2, wherein the aggregate mixture for sealing the through-hole is a coagulable one in which a binder that binds the aggregate is blended.

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