JPH05214892A - Curve driving method of small bore pipe - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] In a method of burying a small-diameter pipe with a low axial load bearing capacity by curved propulsion, the burying method is a two-step method, and it is easy to install inside the burying tube. Providing a construction method that enables burial into a curve. [Structure] While deflecting the front conductor 1 from within the starting shaft A in a predetermined target direction, the rear end of the following temporary pipe 2 is pressed to sequentially push and embed the temporary pipe, and the temporary pipe is reached within the reaching shaft B. After passing through, the buried pipe is connected to the last end of the temporary pipe in the starting shaft, and the casing 3 equipped with the friction coupling body 6 is connected to the end of the temporary pipe in the buried pipe to propel the casing or The temporary pipe and the buried pipe are advanced by traction and replaced with the buried pipe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curved-propulsion method for small-diameter pipes, and more particularly, to a buried pipe while directly forming a buried hole without excavating the ground when constructing a sewer pipe, a conduit pipe, or the like. The present invention relates to a propulsion method for burying and constructing, and particularly to a method for constructing a curved burial of a small diameter pipe, that is, a curve propulsion method.

[0002]

2. Description of the Related Art Conventionally, in order to form a curved portion by a propulsion method, a plurality of direction correcting jacks are provided on an outer edge portion of a leading conductor having excavating means, and the leading conductor is targeted by expanding and contracting the direction correcting jacks. To a predetermined direction. In this state, by applying a propulsive force to the rear end of the buried pipe row at the rear with a pushing jack or the like, the front conductor is propelled in the target direction, and the buried pipe is also propelled along the buried hole of this front conductor. Go

Normally, a straight cylindrical pipe is used as the buried pipe, and a V-shaped opening is formed on the inner and outer surfaces of the end faces of the buried pipes in the curved portion. After the completion of the propulsion, the V-shaped opening is closed by mortar or the like from the inside and processed. However, the V-shaped opening treatment can be performed on a large-diameter pipe or a buried pipe of a medium-diameter pipe,
A V-shaped opening process cannot be performed on a small-diameter pipe that a person cannot enter into the buried pipe.

Therefore, as a curve propulsion method for solving the above-mentioned problem, as shown in FIG. 5, the front portion and the rear portion are formed behind the front conductor via a bendable deflecting means midway in the axial direction. While sequentially connecting the integrally connected propulsion supports, an embedded pipe, in which the front part and the rear part are integrally joined, is connected to the outer periphery of the propulsion support through a flexible part that can be bent midway in the axial direction. A holding mechanism provided at each of a front portion and a rear portion of the propulsion support body to hold and fix the front portion and the rear portion of the buried pipe to the front portion and the rear portion of the propulsion support body, and the propulsion support by the deflection means. A method has been developed in which the front portion and the rear portion of the body are deflected in a predetermined direction, and a propulsive force is transmitted from the propulsion support to the embedded pipe to propel the embedded pipe in a curved shape.

For connecting both ends of each buried pipe, a fitting member for fitting and connecting the buried pipes, a collar for fitting, and the like are used as in the case of a normal buried pipe. Since the embedded pipe is held and fixed to the above-mentioned propulsion support, the embedded pipes are also linearly connected at their ends, similarly to where the propulsion supports are connected. Watertightness can be further obtained by connecting and fixing the connecting portions of the buried pipes by bonding, fusing or other joining means.

[0006]

In the above-mentioned prior art, the deflection means of the propulsion support is capable of deflecting the angle formed by the front part and the rear part of the propulsion support, and the buried pipe also has a front part and a rear part. It is bendable via the flexible portion, and the embedded pipe is also bent in accordance with the bending angle of the propulsion support body and can be propelled in one step along an arbitrary curve. However, in the above method, it is necessary to incorporate many means such as curve formation, holding, measurement, and soil removal in one step of promotion, which complicates construction management and quality control. Also, if the propulsion extension becomes longer,
A large amount of deflecting means is required to be installed on the propulsion support for each buried pipe, and a system or the like for forming a curve by interlocking the deflecting means must be manufactured, which increases the manufacturing cost. And among small-diameter pipes, φ200-φ300m
In a buried pipe having a small m, the deflection means, the casing, and the like are inserted into the buried pipe, so that the structure is very compact and complicated, and it is currently difficult to manufacture.

Therefore, an object of the present invention is to provide a method for solving the above-mentioned problems in the curve propulsion method for small-diameter pipes and for reliably performing curved propulsion of small-diameter pipes with a simple device. Especially.

[0008]

That is, according to the present invention, the front conductor is deflected in the target vertical direction from the inside of the starting shaft, and the rear end of the temporary pipe connected to the rear of the front conductor is pressed to sequentially push and embed the temporary pipe. ,
After penetrating the temporary pipe to the inside of the reaching shaft, the buried pipe is connected to the last end of the temporary pipe in the starting shaft, and the casing equipped with the friction coupling body is connected to the end of the temporary pipe in the buried pipe. PROBLEM TO BE SOLVED: To provide a curved propulsion method for a small-diameter pipe in which a temporary pipe and a buried pipe are moved forward and replaced with a buried pipe by propulsion or towing.

As the temporary pipe, since the conventional curve propulsion method is used, a steel material or the like having a relatively high strength is used so as to withstand the handedness due to the curve. Since the joint portion of each temporary pipe opens in a V-shape at the curved portion, it is desirable to fit a collar or the like on the joint portion so that soil or the like does not enter during propulsion.

A conventional technique such as a gyrocompass for continuously detecting an azimuth angle is used to determine whether the leading conductor is propulsively embedded in a correct curve. As a method for measuring the propulsion distance of the leading conductor, a laser irradiation method, a rotary encoder method, or the like that detects the press-fitted amount of the temporary pipe in real time in the starting shaft is required.

The casing and the frictional coupling body only follow behind the temporary pipe that has already been propulsion-embedded, and it is only necessary to disperse and transmit the propulsive force from the frictional coupling body of the casing to the buried pipe.

As the buried pipe, watertightness such as a concrete pipe in which a front portion and a rear portion are integrally joined via a flexible portion which can be bent midway in the axial direction or a polyethylene pipe which is a flexible synthetic resin is used. Excellent tubing can be used.

[0013]

With the curved propulsion method of the present invention, the laying of the buried pipe only follows the trajectory of the temporary pipe while advancing the already buried temporary pipe, and there is no need for earth discharging means or deflecting means in the buried pipe. Instead, it became a simple device with only a casing and a friction joint, and could be easily installed even in a small-diameter buried pipe.

[0014]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is an explanatory view showing an embodiment of the present invention, showing a completed state of curve propulsion embedding in the first step. In the first step of propulsion, the front conductor 1 is installed in the starting shaft A, and the front conductor 1 is pushed and buried by being pushed by the original push jack 9 while excavating by the excavation means equipped at the tip of the front conductor 1. .. When the propulsion of the front conductor 1 is completed, the temporary pipe 2 is connected to the rear of the front conductor 1, and the rear end of the temporary pipe 2 is pressed by the source push jack 9 to propel the front conductor 1 and the temporary pipe 2. When the leading conductor 1 reaches the starting point of the curve, it is deflected in a predetermined direction by a plurality of direction correction jacks (not shown) provided in the leading conductor 1 to maintain the planned curve. In this way, the temporary tube 2
The curved conductors are connected to each other to perform the curving, the leading conductor 1 reaches the reaching shaft B, and the propulsion of the first step is completed.

When the curved pipe burial of the temporary pipe 2 is completed, the buried pipe 3 in which the front portion and the rear portion are integrally connected is connected to the starting shaft A through the flexible portion 8 which can be bent in the middle of the axial direction. It A casing 5 is connected to the rear end surface of the temporary pipe 2 in the buried pipe 3 to transmit the propulsive force to the temporary pipe 2. The casing 5 is equipped with a frictional coupling body 6 that transmits a propulsive force to the embedded pipe 3, and the embedded pipe 3 is advanced by the frictional force as the casing 5 advances. In this case, as a method of advancing the casing 5, the casing 5 may be pressed from the starting shaft A side, or the casing 5 may be connected and installed in the temporary pipe 2 and pulled from the reaching shaft B side.

FIG. 2 shows that the casing 5 installed in the buried pipe 3 is pushed or pulled to advance the buried pipe 3,
It is explanatory drawing which shows the condition which removes the temporary pipe 2 from the reaching shaft B side. When the propulsion of the buried pipe 3 on the starting shaft A side is completed, the next buried pipe 3 and the casing 5 are connected to the buried pipe and the casing 5. They are connected and the casing 5 is pressed or pulled to sequentially advance the buried pipe 3 and remove the temporary pipe 2.

Next, as shown in FIG. 3, the attachment state of the temporary pipe 2 and the buried pipe 3 during the two-step propulsion by the traction system will be described. The casing 5 is inserted into the temporary pipe 2 from the reaching shaft B side. Then, it connects to the inside of the starting shaft A. The end of the temporary tube 2 in the last row is fixed by the casing 5 and the transmission metal fitting 10 so that the propulsive force of the casing 5 can be transmitted.
In the casing 5 in the portion of the embedded pipe 3 following the temporary pipe 2, the friction coupling body 6 that transmits the propulsive force of the casing 5 to the embedded pipe 3 is provided.
Is equipped with. Casing 5 of flexible portion 8 of buried pipe 3
The part is configured with a hinge mechanism so that it can be deflected together with the buried pipe 3. In the present embodiment, the friction coupling bodies 6 are installed at two locations before and after the buried pipe 3,
It can be reduced depending on the diameter of the buried pipe and soil conditions.
Further, since the joint portion of each buried pipe 3 is held and fixed by the friction coupling body 6, the joint portion does not move.

FIG. 4 illustrates a situation in which the flexible embedded pipe 4 is propulsively embedded by the pressing method. The end of the temporary pipe 2 in the last row is connected to the casing 5 and the transmission fitting 1.
Fixed by 0. After connecting the buried pipe 4 to the rear end of the temporary pipe 2 so as to cover the casing 5, the casing 5
The friction coupling body 6 installed in the operating unit is operated to expand the buried pipe 4
Stick it to the inner wall. Then, by pushing the rear end of the casing 5 with the former push jack 9, the propulsive force is increased.
Further, the temporary pipe 2 and the friction coupling body 6 are transmitted to the embedded pipe 4, and the temporary pipe 2 and the embedded pipe 4 move forward and are replaced by the embedded pipe 4. In this case, the buried pipes 4 are connected to each other by the conventional bonding or fusion technique.

As the casing 5, a PC steel material or a steel pipe material can be used depending on the transmission system of the propulsive force, the pipe diameter, the propulsion extension, the soil condition and the like.

When the replacement of the temporary pipe 2 with the buried pipe is completed,
The friction joint 6 mounted on the casing 5 is reduced, and the casing 5 is sequentially pulled out from the starting shaft A side or the reaching shaft B side to complete the curvilinear burial.

[0021]

According to the two-step curve propulsion method of the present invention,
In the process step, since the curved propulsion is carried out by the temporary tube having a relatively high strength, the buried pipe is not damaged by the propulsive force unlike the conventional case. In the second step, the structure of the curved pipe row that has already been constructed is simply replaced by replacing the temporary pipe with the buried pipe. The mechanism installed in the buried pipe is also friction-coupled with the casing in several places. It became a relatively simple device only for the body, and could be easily constructed by curving a small-diameter pipe.

[Brief description of drawings]

FIG. 1 is a plan view for explaining the completion state of curve propulsion burying in the first step of the present invention.

FIG. 2 is a plan view illustrating curve-promoting embedding in the second step of the present invention.

FIG. 3 is a plan view illustrating how the temporary pipe and the buried pipe are attached when the two-step propulsion is performed by the pulling method.

FIG. 4 is a plan view illustrating how the temporary pipe and the buried pipe are attached when two-step propulsion is performed by the pressing method.

FIG. 5 is a plan view illustrating a conventional curve propulsion method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Leader conductor 2 Temporary pipe 3 Buried pipe having a bendable flexible portion in the middle 4 Flexible buried pipe 5 Casing 6 Friction coupling body 8 Flexible portion 9 Original push jack 10 Transmission metal fitting A Starting shaft B Arrival shaft

Claims (1)

[Claims] 1. In a method of propulsively embedding a small-diameter pipe in a curved line, the front conductor is deflected from the inside of a starting shaft in a target predetermined direction, and the rear end of a temporary pipe connected to the rear of the front conductor is pressed. After sequentially burying the temporary pipe in a propulsion manner and penetrating the temporary pipe to the inside of the reaching shaft, the temporary pipe is connected to the last end of the temporary pipe in the starting shaft, and the casing equipped with the friction coupling is temporarily mounted inside the buried pipe. A curved propulsion method for a small-diameter pipe, which is connected to a pipe end and advances a temporary pipe and a buried pipe by propelling or pulling a casing to replace the buried pipe.