JPS62233398A - Method of laying construction of buried pipe - 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 (Field of Industrial Application) The present invention relates to a method for laying a buried pipe of a desired diameter underground using an excavator and a temporary pipe.

(Prior art and its problems) Conventionally, the method of burying small-diameter pipe bodies used for sewer pipes, etc. underground is to bury them underground from the starting shaft to the destination shaft using an excavator with the same diameter as the cough pipe body. One method is to excavate the ground and use an excavator to press the pipe, and the other is to use an excavator that has approximately the same diameter as the pipe to be buried and follow it with a temporary pipe of the same diameter to lay a series of temporary pipes between the shafts. Thereafter, a method has been adopted in which a predetermined buried pipe such as a fume pipe is sequentially advanced to follow the last temporary pipe to replace the temporary pipe and the buried pipe.

In the latter method, construction management is easier than in the former method because temporary pipes are used, and the quality of buried pipes can be adequately controlled. The farther downstream you go, the larger the diameter of the pipe is required, and because the diameter of the buried pipe differs between each hole, the diameter of the excavator and temporary pipe must be changed each time. Many types of pipes have to be prepared depending on the diameter of the various pipes, which poses problems such as a great deal of work and effort and high management and equipment costs.

The present invention solves these problems and provides a method for laying buried pipes that allows excavators and temporary pipes to be used as they are even if the outside diameter of the buried pipes is different. be.

(Means for Solving the Problems) In order to achieve the above object, the buried pipe laying method according to the present invention uses an excavator that can excavate the injection pipe to a diameter larger than the outside diameter of the temporary pipe and the buried pipe. Excavating from the starting shaft side to the destination shaft while sequentially connecting the internal temporary pipes, and during excavation, lubricant is supplied at a predetermined pressure from the starting shaft side to the injection pipe in the temporary pipe to fill the temporary pipe at the forefront. The lubricant is injected between the temporary pipe and the excavated ground from the injection pipe of the pipe, and after the temporary pipe has been laid from the starting shaft to the arrival shaft, an adapter is connected to the last temporary pipe and the lubricant is inserted through this adapter. The buried pipes are connected one after another and pushed forward, and during the pushing, a backfilling material containing cement is injected from the adapter through the injection pipe in the temporary pipe from the shaft side and between the buried pipe and the excavated ground. The feature is that the temporary pipe and the buried pipe are replaced by pushing.

(Function) If the outside diameter of the temporary pipe is larger than the outside diameter of the buried pipe, use an excavator capable of excavating to a diameter larger than the temporary pipe to lay the temporary pipe between the shafts, and then The buried pipes are sequentially connected to the temporary pipes and pressed, thereby replacing the temporary pipes with the buried pipes.

In addition, if the outside diameter of the temporary pipe is smaller than the outside diameter of the buried pipe, excavate to a diameter larger than the outside diameter of the excavator, lay the subsequent temporary pipe between the shafts, and then install the temporary pipe and the buried pipe in the same way as above. A series of buried pipes will be installed between the shafts to replace the existing pipes.

In this method of laying underground pipes, when installing temporary pipes between vertical shafts, lubricant is injected between the outer periphery of the temporary pipes and the excavated ground to prevent the ground from collapsing. When replacing a buried pipe, a backing material containing cement is injected between the outer periphery of the buried pipe and the excavated ground to replace the slipping material and fix the buried pipe underground.

(Embodiment) An embodiment of the present invention will be described with reference to the drawings. (1) is an excavator, and as shown in FIG. The cutter (3) is inserted into the cylindrical body (2) so as to be coated with a film. A short cylindrical body (
The cylindrical hood (4) is removably fixed to the outer periphery of the front end of the short cylindrical body (6) with bolts or the like. . (7
) is a cutter rotation drive mechanism attached to the frame (8) at the rear of the short cylinder (6).

(9) is a temporary tube whose outer diameter is approximately the same as the outer diameter of the cylindrical body (2) of the excavator (11), and a feeding pipe arranged in the cylindrical body (2) in the internal space. Sludge drainage pipe (10a) (ll
a) Sludge feed and discharge pipe connected and communicating with (10) (11)
At the same time, a lubricant injection pipe (12) is arranged inside the thick wall. In addition, the temporary pipe (9) is formed with an inner and outer double pipe, and an injection pipe is arranged between the inner and outer pipes, and a screw conveyor for removing sludge is arranged inside the inner pipe instead of a sludge feeding and draining pipe. It's okay.

A burying method using such a temporary pipe (9) and the excavator (1) will be explained in cases where the outside diameter of the buried pipe is smaller than that of the temporary pipe and when the outside diameter is larger than that of the temporary pipe.

(a) If the outside diameter of the temporary pipe is larger than the outside diameter of the buried pipe (
(See Figures 1 and 2).

Excavator (11 starts from shaft (13) and reaches shaft (14)
A temporary pipe (9) of a predetermined length is connected to the rear end of the propulsion device (15) from the starting shaft (13).
) through the abutment rod (16), and this pressing operation is repeated while sequentially connecting the temporary tubes (9).

The temporary pipes (91) are connected to each other by bolts and bolt holes (not shown) provided on the outer periphery of both ends of the temporary pipes (9). (
12) Make the connection.

The rearmost tracheal tube (
The injection pipe (12) in 9) is a lubricant tank (17) installed on the ground.
is connected to the excavator 1 via an injection pump (18).
A viscous and non-hardening lubricant (19) such as a bentonite solution in the lubricant tank (17) is supplied to the injection pipe (12) of the temporary pipe (9) that is press-fitted into the ground excavated in step 1). It is propelled while being injected from the front end of the foremost tracheal pipe (9) between the outer peripheral surface of the tracheal pipe (9) and the excavated ground. In addition, the injection pressure of the slipping material is an appropriate pressure higher than the groundwater pressure in the ground.

The earth and sand excavated by the cutter (3) of the excavator (11) is transported to the mud drainage pipe (
11) to the outside of the shaft.

In this way, when the temporary pipe (9) is buried from the starting shaft (13) to the reaching shaft (14), the diameter of the front end is formed on the rear end surface of the temporary pipe (9) on the starting shaft side, as shown in Fig. 2. A truncated cone-shaped adapter (21) that is equal to the outer diameter of the temporary tube (9) and whose rear end diameter is equal to the outer diameter of the buried tube (20) is connected, and a protrusion is attached to the rear end of this adapter (21). The front end inner peripheral surface of the buried pipe (20) is inserted into the provided ring part (22).

The adapter (21) has an injection tube (
An injection port (23) is provided that can be connected to the pipe (12) and is open on the outer circumferential surface of its front end.
4), when pushing out the temporary pipe (9) from the reaching shaft (14) side.
), the backfilling material (25) in the backfilling material tank (24) installed on the ground is passed through the injection pipe (12) into the injection port (23).
The backfilling material (25) is injected into the space between the excavated ground and the outer periphery of the buried pipe (20).

As this backfilling material (25), a self-hardening material containing cement or the like is used, and preferably hardens within 1 to 3 days after injection.

Prior to burying the buried pipe (20), a backing (26
) is installed and therefore the injected backfill material (2
5) will not leak into the starting shaft (13).

In this way, the buried pipe (20) connected to the adapter (21)
) is buried, the next buried pipe (20) is buried in the same manner as described above while injecting the backing material (25), and the temporary pipe (9) is buried.
) will be replaced with a buried pipe (
20).

Incidentally, the buried pipes (20) are connected to each other by appropriate means such as a J collar ring having a T-shaped cross section.

(b) If the outside diameter of the tracheal pipe is smaller than the outside diameter of the buried pipe,
(See Figures 3 and 4).

First, a cutter (3) with a diameter approximately equal to the outer diameter of the buried pipe (20) is attached to the cylindrical body (2) of the excavator (1).
), and a buried pipe (
A hood (4) having an outer diameter approximately equal to the outer diameter of the temporary pipe (9) is fitted over the pipe (20), and a backing (27) that closely contacts the outer periphery of the temporary pipe (9) is attached to the mouth of the starting shaft (13).

Thereafter, this excavator (11) is made to excavate from the starting shaft (13) toward the arrival shaft (14), and the same temporary pipe (9) as in the previous embodiment is connected to the rear end.
9) are sequentially pushed forward by the propulsion device (15). At this time, the excavated soil is discharged and the lubricant (19) is injected in the same manner as in the previous embodiment, and the lubricant (19) injected between the outer periphery of the tracheal pipe (9) and the excavated ground improves the ground. Prevent collapse. The injection pressure of the slipping material (19) is always maintained at a constant pressure to prevent the ground from collapsing.

The temporary pipes (9) connected in series in this way reach the vertical shaft (14)
When the tunnel is buried, a backing (28) is also attached to the entrance on the reaching shaft (14) side, and the slipping material (19) is kept sealed between the temporary pipe (9) and the excavated ground under constant pressure. do.

Next, the diameter of the front end is attached to the rear end of the rearmost tracheal tube (9).
A frusto-conical adapter (29) whose rear end diameter is equal to the outer diameter of the buried pipe (20) is connected.

This adapter (29) has an injection port (30) connectable to the injection pipe (12) disposed inside the temporary tube (9), and the injection port (30) has a check valve (31). The adapter (29) is opened on the outer circumferential surface through the adapter (29).

A buried pipe (20) having a larger diameter than the temporary pipe (9) is connected to this adapter (29) subsequently, and the buried pipe (20) is pushed by the propulsion device (15) to open the temporary pipe (9). Reaching shaft (
]4) When pushing out the temporary pipe (
The backfilling material (25) in the backfilling material tank (24) installed on the ground is inserted into the adapter (2) through the injection pipe (work 2) installed in the adapter (2).
9) from the injection port (30), and connect the excavated ground and buried pipe (
The space created between the outer peripheries of 20) is filled with backing material (25).

In addition, it is desirable to provide a check valve plate (31) in close contact with the excavated ground on the outer periphery of the small diameter side (temporary pipe side) of the adapter (29), and this valve plate (31) allows the self-hardening backfill material (
25) should not mix with the previously injected lubricant (19).

In this way, the buried pipe (20) connected to the adapter (29)
) is buried, the next buried pipe (20) is buried in the same manner as described above while injecting the backing material (25), and the temporary pipe (9) is buried.
) will be replaced with a buried pipe (
20).

In addition, if the buried pipe (20) is propelled and pressed, the lubricant (19) pushed out to the reaching shaft side is collected into the lubricant tank (17) side, and if cement is mixed with this lubricant, a self-hardening backing is created. It can be reused as a filling material.

(Effect of the invention) As described above, according to the buried pipe laying method of the present invention, when the outside diameter of the buried pipe is different from the outside diameter of the excavator and the temporary pipe,
By changing the digging diameter of the excavator accordingly,
It is now possible to bury pipes of several different diameters using the same excavator and temporary pipe, and pipes that gradually become larger in diameter from upstream to downstream, such as sewer pipes, can be laid continuously. This enables pipe burying work to be carried out efficiently and economically.

Furthermore, since the lubricating material and the curable injection material can be used in the same injection tube disposed within the temporary tube, there is no need for separate piping, and workability is improved.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and FIG. 1 is a simplified longitudinal side view of Example 1 in which a temporary pipe is buried, and FIG. 2 is a simplified longitudinal side view of Example 1 in which a temporary pipe is replaced with a buried pipe. 3 is a simplified vertical side view of Example 2 with the temporary pipe buried; FIG. 4 is a simplified side view of the temporary pipe and buried pipe replaced; FIG. 5 6 is a longitudinal sectional side view of the excavator, and FIG. 6 is a perspective view of its frame body. ti)... Excavator, (2)... Cylindrical body, (3)...
... cutter, (4) ... hood, (9) ... temporary pipe, (12) ... lubricant injection pipe, (13) ... starting shaft, (14) ... arrival shaft, (15)...propulsion device,
(19)...Sliding material, (20)...Buried pipe, (21)
(29)...adapter, (25)...backing material. Agent Patent Attorney Fusatsuyo Nakao ((”： ＋、：、：
, 1 sabe 6 ko, 7\ y ha

Claims (2)

[Claims] (1) Excavating from the starting shaft side toward the destination shaft while sequentially connecting the temporary pipes with injection pipes inside to an excavator that can excavate to a diameter larger than the outside diameter of the temporary pipes and buried pipes. During excavation, lubricant is supplied at a predetermined pressure from the starting shaft side to the injection pipe in the temporary pipe, and the lubricant is injected between the temporary pipe and the excavated ground from the injection pipe of the foremost temporary pipe, so that the temporary pipe is After it has been laid from the starting shaft to the destination shaft, an adapter is connected to the last temporary pipe, and the buried pipes are successively connected through this adapter, and the pipe is pushed forward, and during the pushing, the pipe is injected into the temporary pipe from the reaching shaft side. A buried pipe laying method characterized by injecting a backing material containing cement between the buried pipe and the excavated ground from an adapter through the pipe, and replacing the temporary pipe with the buried pipe by pushing the buried pipe. (2) The excavator is characterized in that a cutter of a large or small diameter is replaceably attached to the cylindrical body according to the outer diameter of the buried pipe, and a hood is detachably fitted on the outer periphery. A method for laying a buried pipe according to claim 1.