JP2710823B2 - Intermediate manhole burying method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for newly constructing an intermediate manhole in an existing buried pipe of a sewer.

[Conventional technology]

Conventionally, when constructing an intermediate manhole in an underground pipe,
In general, a method of excavating a shaft to the position of a buried pipe and constructing a manhole in the shaft is employed. For excavation of a shaft, for example, the applicant of the present invention has previously filed
Can be used. This is to excavate the inside of a steel casing while press-fitting it. In the case of constructing a manhole in an existing buried pipe, the procedure is to excavate the shaft to the depth of the buried pipe.

The construction work of the intermediate manhole in the buried pipe is started by excavating the shaft to the buried pipe by the above-described excavation procedure and exposing the buried pipe in the shaft. Thereafter, an operator enters the shaft or uses a dedicated cleaning device to remove soil and the like adhering to the inner wall of the casing. Then, leveling of the pit bottom is performed, and groundwater is prevented from erupting and water-stopping concrete, which is the foundation of manholes, is cast.
During this process, groundwater springs out,
It is necessary to improve the ground by injecting a chemical solution around the casing and the buried pipe.

Next, an operation for opening a hole for connecting the manhole frame to the buried pipe is performed. In this work, the solidified waterproof concrete is suspended from the top to the outer surface of the buried pipe, and a hole is formed in the buried pipe. Conventionally, such a drilling operation is performed manually, and a sheath tube is passed through an insertion hole formed in watertight concrete, and this is fixed with mortar. The sheath pipe is inserted into the hole of the buried pipe, and the gap between the water-stopping concrete after the removal and the sheath pipe is filled with mortar to form an introduction path. Then, as a final step, an intermediate manhole is constructed on the inner pipe, and the manhole frame and the buried pipe are connected.

[Problems to be solved by the invention]

However, conventionally, since the worker had to work inside the shaft before pouring the waterproof concrete, it was necessary to stop the water around the buried pipe for this work, and the ground had to be improved. This ground improvement is one of the causes of the uncertain work, high labor costs and long construction time. Also,
The buried pipe may be displaced from its original position, and this movement may adversely affect surrounding buildings.
Further, a drug to be injected into the ground for ground improvement may be mixed into the well water, which may affect environmental problems.

Therefore, an object of the present invention is to provide a construction method that enables an operation from excavation of a shaft to placement of waterproofing concrete without performing ground improvement.

[Means for solving the problem]

The intermediate manhole burying method of the present invention is a method of digging a shaft for a buried pipe and opening a connection hole for communicating and connecting to the manhole from the shaft to the buried pipe, in order to achieve the above object, A work pipe is raised from the pipe wall of the buried pipe including a connection hole opened to the buried pipe after excavation of a shaft, and the inside thereof is cut off from the outside of the shaft, and a pressure fluid is supplied to the inside of the work pipe and The surface of the buried pipe is spouted to clean the surface, water-proof concrete is filled around the work pipe, and after the water-proof concrete is solidified, a working hole is opened from the surface to the surface of the buried pipe. Open a connection hole in the buried pipe with a cutter passed through the hole,
The work hole is connected to the connection hole through a sheath tube, the mortar is filled between the periphery and the work hole, a manhole is further constructed, and the lower end thereof is connected to the sheath tube.

〔Example〕

Hereinafter, the features of the present invention will be specifically described with reference to the embodiments shown in the drawings.

FIGS. 1 (a) to 1 (i) are views showing the steps of the present invention, and the steps will be described in order.

In FIG. 1 (a), a shaft 1 is formed by a casing B toward a buried pipe A. The excavation of the shaft 1 is carried out, for example, as described in the section of prior art,
This is performed using the device described in 83719. The groundwater C is accumulated in the casing B due to the excavation of the shaft 1.

FIG. 1 (b) shows that after the shaft 1 is excavated to the depth of the buried pipe A, the cleaning device 20 is inserted into the casing B by the wire 21.
Indicates a suspended state. The cleaning device 20 pivots in the casing B, scrapes off the soil and the like adhering to the inner wall of the casing B by a scraper 22 provided at the lower end portion, and includes the soil and the like deposited on the surface of the buried pipe A. Can be paid off.

FIG. 1 (c) shows a state in which the work pipe 2 is set in the casing B in order to perform work such as cleaning of the pipe surface of the buried pipe A and filling of waterproofing concrete after the cleaning work. The work pipe 2 includes a hollow cylindrical main body 3 as shown in FIG. 2 and a suction pad 4 at a lower end. The suction pad 4 is formed in a bell-mouth shape so as to be able to adhere along the peripheral wall of the buried pipe A.

The main body 3 has flanges 31 on the upper main body 31 and the lower main body 32, respectively.
The guide plate 5 can be separated from the portions a and 32a, and a guide plate 5 also serving as a weight is provided outside. The guide plate 5 is integrated with the upper body 31, and a bolt 5a provided at the lower end is provided.
Are inserted into the holes of the flanges 31a and 32a, and the upper and lower main bodies 31 and 32 are integrated so as to be separable by the bolt 5a and the nut 33.

A communication hole 3a for supplying compressed air and pressurized water is provided at an upper end of the main body 3, and a connection hose 3b connected thereto is provided.
Hanged using. The connection hose 3b is switchably connected on the ground to a compressor or a pressure water pump, a vacuum pump, or the like, and supplies compressed air or pressure water to the work pipe 2 or, conversely, makes the inside of the suction pipe 4 negative pressure. The suction power can be increased. Furthermore,
The guide plate 5 is provided with a roller 5b that slides along the inner wall of the casing B.

In FIG. 1 (c), compressed air or pressurized water is supplied to the work pipe 2, and the surface of the buried pipe A is cleaned by blowing air or water from the suction pad 4 and the surface of the buried pipe A. Thereafter, the connection hose 3b is switched to the vacuum pump side, and the inside of the main body 3 is set to a negative pressure. Thereby, the suction pad 4 also receives the water pressure of the external groundwater, and adheres strongly to the surface of the buried pipe A. In this way, even if the surface of the buried pipe A is rough, the degree of adhesion of the suction pad 4 is kept high, and the inside and the outside of the main body 3 are completely separated.

FIG. 1 (d) shows a process of supplying the waterproofing concrete, in which the toremi tube 6 is inserted into the casing B. Waterproof concrete D is injected from the lower end of the torre pipe 6 and is poured so that the lower side than the guide plate 5 is filled. By the casting of the waterproofing concrete D, the working pipe 2 integrated with the buried pipe A by the suction pad 4 is held without changing its position.

FIG. 1 (e) shows a process in which a submersible pump 7 is installed in the casing B, the groundwater in the casing B is pumped up and emptied, and then a connection hole is made in the buried pipe A. In this process, after pumping groundwater,
31 is separated from the lower body 32 together with the guide plate 5 and collected on the ground. This separation is performed by the operator
And the nut 33 is removed from the bolt 5a. In this operation, since the waterproof concrete D is solidified, there is no danger to the operator.

By the above operation, the upper main body 31 and the guide plate 5 are recovered on the ground, and the solidified watertight concrete D forms the working hole d by the lower main body 32 remaining between the buried pipe A and the sleeve. Will be. Then, the cutter 8 is hung from the ground, passed through the work hole d, and a hole is formed while shaving the pipe wall of the buried pipe A. Thereby, a connection hole a for forming a flow path with the intermediate manhole is formed in the pipe wall of the buried pipe A.

After the opening work of the connection hole a, the submersible pump 7 and the cutter 8 are collected, and the sheath tube 9 is inserted into the connection hole a as shown in FIG. At this time, the sheath tube 9 is inserted into the lower body 32 of the working pipe 2 which can be used as a sleeve,
The lower end is connected to the connection hole a while being guided by the inner wall of the lower body 32.
Can be located. Thereafter, as shown in FIG. 1 (g), the lower end of the mortar supply pipe 10 is inserted between the lower body 32 and the sheath pipe 9, and the mortar E is filled. By this filling of the mortar E, the sheath pipe 9 is integrated with the surrounding solidified waterproof concrete D at the bottom of the shaft 1.

After the above steps, the intermediate manhole 11 shown in FIG. 1 (h) is inserted into the shaft 1, and the opening at the lower end is connected to the sheath pipe 9. At this time, the lower body 32 remaining in the work pipe 2
The connection structure is such that the lower end of the intermediate manhole 11 fits around the periphery. When the mortar F is filled in the casing B as a final step as shown in FIG. 1 (i), an underground structure including the buried pipe A and the intermediate manhole 11 is constructed. Reference numeral 11a denotes a sewer pipe newly connected to the intermediate manhole 11 or connected from another system.

〔The invention's effect〕

As described above, in the method of the present invention, the steps up to the placement of the waterproofing concrete can be performed underwater. For this reason, it is not necessary to perform ground improvement for stopping water so that work can be performed inside the casing as in the related art, and various troubles associated with ground improvement can be resolved. In addition, since the work in the unstable casing is eliminated, the work can be performed safely, and there is no needless work such as once scraping off the watertight concrete once cast and preparing for the insertion of the sheath tube.

[Brief description of the drawings]

1 (a) to 1 (i) are diagrams showing the method of the present invention in the order of steps, and FIG. 2 is a diagram showing an outline of a sheet pipe. 1: vertical shaft, 2: sheet pipe 3: body, 3a: communication hole 3b: connection hose, 4: suction pad 5: guide plate, 5a: bolt 5b: roller 6: toremi tube, 7: submersible pump 8: cutter, 9 : Saya pipe 10: Mortar supply pipe, 11: Intermediate manhole 11a: Sewage pipe 31: Upper body, 32: Lower body 31a, 32a: Flange, 33: Nut A: Buried pipe, a: Connection hole B: Casing, C: Groundwater D: Water-stop cement, d: Working hole E: Mortar

Claims (1)

(57) [Claims] 1. A method for drilling a shaft into a buried pipe and opening a connection hole for communicating with a manhole from the shaft to the buried pipe, the method including a connection hole opened in the buried pipe after the shaft is excavated. A working pipe is raised from the pipe wall of the buried pipe to shut off the inside of the working pipe from the inside of an external shaft, and a pressurized fluid is supplied to the inside of the working pipe and ejected to the surface of the buried pipe to clean the surface. Filling the surrounding of the working pipe with water-stopping concrete, after solidifying the water-stopping concrete, opening a working hole from the surface to the surface of the buried pipe, and opening a connection hole in the buried pipe by a cutter passed through the working hole. The work hole is connected to the connection hole through a sheath tube, the mortar is filled between the periphery and the work hole, a manhole is further constructed, and the lower end thereof is connected to the sheath tube. During ~ Manhole buried method.