JP2977480B2 - Burying method of manhole pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided for inspection, cleaning and communication of pipe drains at locations where the direction, gradient or diameter of a drain pipe buried underground changes. The method of burying manholes. Sewage pipes are made of pottery pipes, reinforced concrete pipes, etc., but most manholes are made of concrete pipes.

[0002]

2. Description of the Related Art The outer diameter of a manhole is 900 mm, 1200 mm.
mm, 1500 mm, etc., and in order to bury it underground, a hole larger than the diameter of the manhole pipe is drilled using the Benoto method, reverse method, earth drill method, etc. And then buried at a predetermined depth, and then burying soil or the like between the hole and the manhole pipe and fixing it.

[0003]

However, in the case of the conventional burying method, a concrete manhole pipe is buried after a hole is separately drilled once with a rotating bit or a rotating bucket attached. For this reason, there is a disadvantage that it takes too much time because the manhole pipe must be buried after the drilling machine has been removed after the hole has been drilled once. Also, since the pipe is inserted after drilling, there is a gap between the ground and the manhole pipe, and it is difficult to fix it firmly. There were inconveniences such as the occurrence of cracks due to earthquakes and vibrations generated by transportation running on the ground, and the possibility that sewage in the manhole would seep into the ground. Therefore, the present invention has been made in view of the drawbacks of the related art, and the burying work of the manhole pipe does not take much time. It is an object of the present invention to provide a method for burying a manhole tube that does not easily seep out.

[0004]

That is, according to the present invention, a hole is made at the bottom center of a bottomed cylindrical concrete manhole pipe, and a central pipe is inserted from the top of the manhole pipe toward the bottom center hole. A step of connecting one end of the pipe to the hole, a step of joining a drilling means such as a bit to the outer surface of the bottom of the manhole pipe, and a rotation of rotating the manhole at a predetermined speed on the outer periphery of the manhole pipe and pressing the manhole downward. A step of installing a bending and stretching machine, a step of continuously injecting water, sludge, or a bentonite stabilizing liquid into the central pipe after supplying water to the manhole pipe to fill the manhole, and a bottom of the manhole while preventing backflow. Discharging the liquid from the center hole into the ground,
A step of continuously sucking sludge that springs out of the ground around the manhole pipe through a suction pump, and a soil hardening agent such as water glass, Portland cement, and ente in the central pipe after the manhole pipe is buried to a predetermined depth. Of the manhole pipe by injecting water and solidifying the soil near the outer periphery of the manhole pipe with a soil hardener, and removing the central pipe after completion of the embedding and closing the central hole after draining the water in the manhole The method achieves this objective.

[0005]

In the embedding method according to the present invention, a hole is formed in the center bottom of the manhole, and the inside of the center pipe and its outer periphery are separated from each other in order to connect the hole and the upper part of the manhole via the center pipe. Even if the central pipe is muddy, the manhole will be filled with fresh water before and after excavation. Then, drilling means such as bits are attached to the outer periphery of the manhole pipe, and when the manhole pipe is rotated at a predetermined speed in a state where the liquid is supplied from the central pipe, the hardness of the soil is softened by the liquid discharged from the central pipe. Bits facilitate excavation. In addition, the sludge generated by excavation is ejected together with the crushed rock from the gap between the perimeter of the manhole and the soil, but the liquid at the perimeter of the manhole pipe is forcibly sucked by the suction pump, so the sludge accompanying the excavation can be efficiently removed. It can be removed. Next, after the excavation is completed, the soil hardener is injected into the ground around the outer periphery of the manhole pipe by injecting the soil hardener from the central pipe to increase the strength of the ground surface at the outer circumference and the bottom of the buried manhole pipe. At the same time, the outer periphery of the manhole tube is entirely covered with soil hardened with the hardener. Further, since the supplied soil hardener is supplied through a central pipe which is considerably smaller than the inner diameter of the manhole pipe, the required amount of the soil hardener is minimal. After the burial is completed, the manhole pipe is drained and the central pipe is removed, so that the pipe is buried with the pipe clean.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 schematically illustrates a construction method according to the present invention. Reference numeral 1 denotes a cylindrical bottomed manhole pipe made of concrete, and a through hole for connecting a central pipe 3 is provided at the bottom center of the manhole pipe 1. The center pipe 3 connected to the hole 2 extends above the manhole pipe 1. A bit 4 as a steel drilling means is conically joined to the outer periphery of the bottom of the manhole pipe 1, and a backflow preventing liquid supplied from the central pipe 3 does not flow back outside the hole 2 at the bottom. Valve 5 is mounted. In this embodiment, the conical bit 4 is joined, but the present invention is not limited to this, and a triangular pyramid or quadrangular pyramid bit may be used.

Next, reference numeral 6 denotes a manhole tube 1 fixed to the ground surface.
Is held by the hydraulic chuck means 7 and the tube 1 is rotated at a predetermined speed. The rotation speed is preferably 2-3 times / second. 8 is the manhole tube 1
Is a pump for sucking the sludge composed of the rock and the soil crushed by the bit 4 through a water absorbing pipe 9 arranged near the outer periphery of the filter. The sludge sucked up by the pump 8 is supplied to a filtration tank 10 through a pipe 11. It is separated into a liquid and a solid by precipitation and the like. The separated liquid is supplied to the filtration tank 10
Through the tube 12 to the central pipe 3,
It is ejected again to the excavation part via the central pipe 3. still,
The amount of sludge sucked and sent by the pump 8 depends on the diameter of the manhole pipe to be excavated, but is preferably about 100 to 1000 liters / minute, and the amount of water supplied from the filtration tank 10 through the central pipe 3. More is preferred. Reference numeral 14 denotes a preliminary hole dug in advance for efficiently sucking out the ejected sludge by the pump 8, and may be a hole capable of storing a certain amount of sludge.

In the method for burying a manhole tube according to the present invention having the above-described configuration, the manhole tube 1 is buried by the following steps (a) to (h). (A) A hole 2 is pierced in the center of the manhole tube 1 and a central pipe 3 is inserted into the hole 2 for connection. (B) Further, a drill bit 4 is provided at the bottom of the manhole pipe 1.
Connect. At the time of connection, the bit 4 is firmly fixed so that the bit 4 does not come off due to rotation of the manhole tube. (C) In addition, the rotary bending and stretching machine 6 fixed to the surface of the ground is attached to the manhole tube 1 protruding from the surface of the ground. (D) The manhole pipe 1 on the outer periphery of the central pipe 3 is filled with fresh water 16 to increase the weight of the manhole pipe. (E) A liquid (sludge or bentonite) for promoting excavation circulating inside the central pipe 3 is continuously injected from the filtration tank 10. (F) Underground manhole pipe 1 via suction pump 8
The sludge spouting from the outer periphery is sucked and supplied to the filtration tank 10. By driving the rotary bending and stretching machine 6 through the above-described steps, the concrete manhole pipe 1 is rotated at a rotation speed of 2 to 3 times per minute, so that the bit provided at the bottom of the manhole pipe 1 is rotated. 4 and the weight of the pipe 1, the lower soil is excavated together with the liquid supplied from the central pipe 3, so that the frictional heat accompanying the excavation can be suppressed and the fluidization by supplying the liquid to the soil can be performed efficiently. Drill well. (G) After the manhole pipe 1 sinks to a predetermined depth, the liquid supplied from the central pipe 3 is switched to a soil hardening agent to solidify the soil near the outer circumference of the manhole pipe 1 and to make a seal around the outer circumference of the manhole pipe 1. To strengthen. (H) After the supply of the soil hardening agent is completed, the water filled in the manhole is drained, and then the central pipe 3 is removed from the hole 2, and a plug 18 is inserted into the hole 2 to close the hole. Then, the work of burying the manhole pipe is completed.

[0009]

As described above, according to the method for burying a manhole pipe according to the present invention, the manhole pipe is buried in the ground by rotating the manhole pipe. In comparison with the method, the embedding work is simple and the number of devices used for embedding is reduced.
In addition, a suction pipe in which a central pipe is connected to a hole formed in the center bottom of the manhole pipe, excavation is performed while supplying liquid from the central pipe, and rocks and soil crushed by the excavation are installed on the outer periphery of the manhole pipe. , It is possible to excavate efficiently while relatively suppressing the load on the rotary bending and stretching machine. Furthermore, since the soil hardening agent is supplied via the central pipe after the burial is completed and the soil around the manhole pipe is hardened, the manhole pipe falls down due to land subsidence, etc., and the manhole pipe is damaged by cracks etc. To prevent internal wastewater from leaking into the ground.

[Brief description of the drawings]

FIG. 1 is a front sectional view schematically showing an embedding method according to the present invention.

FIG. 2 is a longitudinal sectional view of the manhole pipe showing a state where the manhole pipe is buried by the method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manhole pipe 2 Hole 3 Central pipe 4 Drilling bit 5 Check valve 6 Rotating bending and stretching machine 7 Hydraulic chuck means 8 Suction pump 9 Pipe 10 Filtration tank 12 Tube 14 Preparatory hole 16 Fresh water 18 Plug 20 Hardening agent was injected into soil part

Claims (2)

(57) [Claims] 1. A step of drilling a hole at the center of the bottom of a bottomed cylindrical concrete manhole pipe, inserting a central pipe from the top of the manhole pipe to a hole at the center of the bottom, and connecting one end of the pipe to the hole. Joining a digging means such as a bit to the outer surface of the bottom of the manhole pipe, and attaching a rotary bending and stretching machine that rotates the manhole at a predetermined speed and presses down the manhole on the outer periphery of the manhole pipe; A step of continuously injecting water, sludge or bentonite stabilizing liquid into the central pipe after supplying water to the manhole pipe and filling the same, filling the central pipe from the center hole of the manhole bottom into the ground while preventing backflow. A step of discharging a liquid, a step of continuously sucking sludge flowing from underground around the manhole pipe through a suction pump, After the burial is buried to a predetermined depth, a step of injecting a soil hardening agent such as water glass, Portland cement, and ente into the central pipe and solidifying the soil near the outer periphery of the manhole pipe with the soil hardening agent, Removing the water from the manhole and closing the center hole after removing the water from the manhole. 2. The apparatus according to claim 1, wherein the water sucked by the suction pump is guided to a settling tank, the water filtered in the settling tank is guided to a central pipe, and the liquid is continuously supplied to the central pipe. The method for burying a manhole tube according to claim 1.