JP2001288984A - Method of forming curve and method of controlling direction of leader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of forming a curve, in which the curve of a propelling pipe is formed easily and surely, and a method of controlling the direction, in which a leader can be deflected freely, efficiently and simply, in a pipe jacking method for propelling and burying the propelling pipe into a ground in a curved shape. SOLUTION: In the curve holding method of a pipe jacking method in which the propelling pipes 7 are propelled and buried successively into a ground in a curved shape, bag bodies 1 for the curve in which high-strength fibers are sealed in a baggy shape is manufactured, a fluid such as water, oil or the like is injected and sealed into the bag bodies for the curve, a plurality of the bag bodies for the curve are arrayed in the circumferential direction of the end faces of joint sections for the propelling pipes, each bag body for the curve is communicated mutually by piping materials 2, propulsive force is transmitted through the bag bodies 1 for the curve of the joint sections for each propelling pipe, and the propelling pipes are followed up along the inside of a curved tunnel hole land-formed by the leader.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion method in which a propulsion pipe is buried in the ground in a curvilinear shape. The present invention relates to a method for controlling the direction of a leading conductor that can be deflected to a predetermined angle.

[0002]

2. Description of the Related Art In a propulsion construction including a curve, a shield excavator or the like, which is a leading conductor at the tip, has a bendable structure so that a directional control jack is extended at a start point of the curve to bend the shield excavator into a predetermined curve. Then, by pushing the shield excavator, a predetermined curved tunnel hole is created. In the case of a horizontal curve, the propulsion pipe following the shield excavator is fitted with cushioning material above and below the center of the joint end face of each propulsion pipe in the case of a horizontal curve, and the cushioning material is used as a fulcrum. In general, a method of easily forming a curve on the left and right, and securing a curve following property and preventing damage due to contact with a pipe end face are generally used. In the case of a vertical curve, a cushion material is attached to the left and right sides of the center portion of the end face of the joint portion of each propulsion pipe, so that a vertical curve can be easily formed.

A direction control jack for bending the shield machine body has a basic structure of a piston and a cylinder and is made of a relatively strong steel material. Hydraulic pressure or pneumatic pressure is used as a drive source for the piston to reciprocate. The shield excavator is bent by supplying hydraulic pressure or the like into the cylinder to move the piston forward or backward.

[0004]

By extending the directional control jack of the shield machine, the shield machine can be bent to a predetermined curve to form a predetermined curved tunnel hole. The propulsion pipe following the shield machine follows the curved tunnel hole with the cushion material attached to the joint as a fulcrum, and forms a curve. However, if the curve propulsion construction is a sharp curve, the bending angle of the joint part of the propulsion pipe will increase, and several cushion materials will be piled up and the thickness will be increased to prevent the pipe end face contact inside the curve However, if the length of the curve is long, a very large amount of cushioning material is required and the material cost is high, and only a part of the cushioning material inside the curve contacts and the propulsion force cannot be transmitted to the outside part. There is. In addition, when combined with vertical curve propulsion, cushioning material must be attached to the entire circumference of the joint end face of the propulsion pipe, which impairs the ability to follow the curve to the curved tunnel hole created by the shield machine. There is a problem that the material cost increases because the cushion material is attached to the entire circumference of the joint end face.

Further, since the directional control jack for bending the shield machine in a predetermined direction is made of a relatively strong steel material to withstand hydraulic and pneumatic pressure, it is heavy and has a narrow shield machine. It is an unsafe and inefficient operation to install on board. In addition, the direction control jack is subjected to a biased pressure due to the bending of the shield machine, thereby deteriorating the sealing performance between the piston and the cylinder, often causing a problem such as oil leakage or the like.

For this reason, the present invention provides a curve forming method for facilitating the formation of a curve of a propulsion pipe in a sharp curve propulsion or a vertical curve propulsion and a deflection of a shield machine to a predetermined curve. The present invention provides a direction control method that can be performed.

[0007]

That is, the present invention relates to a method for holding a curve of a propulsion method in which a propulsion pipe is sequentially buried in the ground in a curved shape in the ground, and is used for a curve in which high-strength fibers are sealed in a bag shape. A bag body is manufactured, a fluid such as water or oil is injected and sealed into the bag body for the curve, and a plurality of the bag bodies for the curve are arranged in the circumferential direction of the end face of the propulsion pipe joint, and the bag for the curve is formed. This is a curve forming method in which the bags are communicated with each other by a pipe material, and the propulsion force is transmitted through the curve bags of the respective propulsion pipe joints to follow the propulsion pipe along the curved tunnel hole formed by the leading conductor. . In addition, a directional control bag body in which high-strength fibers are sealed in a bag shape is manufactured, and a plurality of the directional control bag bodies are arranged in a circumferential direction of an intermediate portion or a rear end portion of the front conductor in the circumferential direction. The control bag is connected from each piping material to a switching valve installed in the starting shaft or in the pipe, and the switching valve is connected to a pump for supplying or depressurizing the fluid by a supply pipe and operates the pump. This is a direction control method of the front conductor by deflecting the front conductor in a predetermined direction by expanding or contracting only a predetermined direction control bag from the switching valve.

[0008] The curved bag is made by sealing a high-strength carbon fiber or aramid fiber in a bag shape. An injection hole is provided in each curve bag, and a fluid such as water or oil can be injected. A plurality of curved bags are arranged at positions that are symmetrical left and right and up and down with respect to the center line of the pipe in the circumferential direction of the end face of the propulsion pipe joint. The plurality of curved bag bodies arranged are communicated with the respective injection holes by a pipe material, and a predetermined amount of fluid is injected into the curved bag body to be inflated and sealed.
Further, since each of the curve bags is communicated with the piping material, the inside pressure is the same.

[0009] The arrangement of the curved bag is determined by examining the propulsion force according to the diameter of the propulsion pipe, the soil condition, and the extension of the propulsion, and the number of arrangements is determined so as to sufficiently withstand the expected propulsion force. You.

[0010] The directional control bag disposed in the circumferential direction of the intermediate portion or the rear end of the leading conductor is made of the same material and structure as the curved bag described above. The injection holes are connected to the switching valves from the respective pipe members. The switching valve is connected to a pump that supplies fluid under pressure or under reduced pressure. In order to deflect the leading conductor in a predetermined direction, only the direction control bag at a predetermined position is expanded or contracted through the switching valve. The placement of the directional control bag is determined in advance based on the diameter of the propulsion pipe and the soil conditions of the tip ground, and the penetration resistance of the tip of the tip conductor is examined in advance. Directional control bag is installed.

As the above-mentioned switching valve and pump, conventional hydraulic and pneumatic devices may be used. As the pipe material for connecting the injection hole of the direction control bag and the switching valve and the supply pipe for connecting the switching valve and the pump, those made of a material such as steel or hard rubber according to the related art are used.

The direction control bag provided on the rear end face of the leading conductor does not contain a fluid such as oil during linear propulsion, and is placed between the leading conductor and the propulsion pipe in a collapsed state. When the leading conductor reaches the starting point of the curve, fluid is injected only into the direction control bag at a predetermined position to expand and deflect the leading conductor,
By pushing the propulsion pipe from behind and excavating the ground with the excavation mechanism at the tip of the leading conductor, the leading conductor creates a curved tunnel hole in a predetermined direction. In the joint portion of the propulsion pipe following the leading conductor, a curved bag body in which a predetermined amount of fluid is injected and expanded is arranged. In the straight propulsion section, the propulsion force is transmitted to the entire curved bag body arranged because the interval between the propulsion pipe joints is maintained uniformly. When the propulsion pipe enters the horizontal curve, the propulsion pipe follows the curved tunnel hole formed by the leading conductor, so that the curve bag inside the curve is compressed and the fluid in the curve bag passes through the piping material, It moves into the curve bag outside the curve and the outside curve bag expands. As described above, since the curved bag body row of one joint does not change in volume, the stress is dispersed by the internal pressure of the curved bag body. The same applies to vertical curve propulsion construction.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view for explaining the arrangement of curved bag bodies according to the curve forming method of the present invention. On the end face of the joint portion of the propulsion pipe 7, three curved bag bodies 1 are arranged vertically above and below the vertical center axis of the propulsion pipe 7. The curve bag 1 is manufactured by sealing a high-strength carbon fiber or aramid fiber in a bag shape.
Is provided with an injection hole (not shown) so that a fluid such as water or oil can be injected. Each bag 1 for curves is communicated by the piping material 2, and the internal pressure in each bag 1 for curves is always the same.

In the present embodiment, the arrangement of the curved bag body 1 is exemplified by six, three in the up and down directions. However, in accordance with the propulsion force which varies depending on the propulsion pipe diameter, the propulsion extension and the soil condition, etc.
It can be changed. As the piping material 2, a commonly used product made of steel or hard rubber may be used.

FIG. 2 is a longitudinal sectional view for explaining a curve forming state of the present invention. (A) is a longitudinal cross-sectional view explaining the state of the bag for curves in a straight propulsion section. The bag 1 for curves arranged in the joint portion of the propulsion pipe 7 allows the fluid injected into the bag 1 for curves to maintain the space between the propulsion pipe joints at a predetermined internal pressure and to uniformly reduce the propulsion force. Distribute and transmit.
(B) is a longitudinal cross-sectional view for explaining the state of the curved bag when the propulsion pipe enters the curved propulsion section. When entering the curved section, the propulsion pipe 7 is deflected in order from the front along the curved tunnel hole formed by the leading conductor, and forms a bent angle with the next propulsion pipe 7 at the joint. The curve bag 1 on the inside of the curve arranged in the joint portion is compressed by bending, and the fluid in the bag 1 for curve moves to the bag 1 for curve outside the curve through the pipe material 2. It expands and abuts against both end surfaces of the joint portion of the propulsion pipe 7 to evenly disperse the propulsion force.

The curved bag body 1 can be additionally attached or removed during the propulsion even when the initially assumed propulsion force is deviated. Also, when combined with the vertical curve propulsion, the curve bag 1 inside the vertical curve is compressed, and the fluid in the bag 1 is filled with the curve bag 1 outside the curve.
As the curved bag 1 is evenly brought into close contact with both end surfaces of the joint portion of the propulsion pipe 7, effective propulsion force can be transmitted.

FIG. 3 is a cross-sectional view for explaining the arrangement of a direction control bag which is a method of controlling the direction of the leading conductor. At the rear end face of the leading conductor 8 such as a shield machine, directional control bags 3 are arranged at four positions around 45 ° in the circumferential direction. The direction control bag 3 is manufactured by sealing a high-strength carbon fiber or aramid fiber in a bag shape, and each direction control bag 3 is provided with an injection hole (not shown).
Each injection hole is connected to a switching valve 4 installed in a starting shaft or a propulsion pipe 7 by a separate pipe member 2. A pump 6 for supplying a fluid under pressure or flowing out under reduced pressure is connected to the switching valve 4 by a supply pipe 5. The switching valve 4 can supply or discharge fluid only to a predetermined pipe member 2 by opening and closing the valve of each pipe member 2.

In this embodiment, the arrangement of the direction control bag body 3 is illustrated at four places. However, depending on the diameter of the propulsion pipe and the soil condition of the ground at the tip, the penetrating force enough to allow the leading conductor 8 to penetrate into the ground at the tip is provided. Is required.

In the propulsion construction in the straight section, the fluid is not supplied to each direction control bag 3, and the propulsion construction is performed in a collapsed state. When the leading conductor extends over the curved section, for example, in the case of a horizontal curve to the left, fluid is supplied to the two directional control bladders 3 on the right side with respect to the vertical center line of the propulsion pipe 7 to expand. Then, the tip conductor 8 is deflected to the left. Then, the excavation mechanism at the tip of the leading conductor 8 is driven to excavate the ground, thereby creating a curved tunnel hole.

In the present embodiment, the method of using the direction control bag body 3 in a curved tunnel hole for curved propulsion construction is disclosed. However, it is possible to use the method for correcting a direction due to deviation from a planned line in normal straight propulsion construction.

[0021]

As described above, according to the curve forming method and the leading conductor direction control method of the present invention, the curved bags arranged at the joint portion of the propulsion pipe are deformed along the bending angle of the propulsion pipe.
The entire surface of the bag body is evenly brought into close contact with the end face of the pipe joint portion, and the transmission of the propulsion force is efficiently performed. In addition, when the bag for curve is completed,
By discharging the fluid in the curved bag body, it can be removed from the joint portion, and can be reused, so that the construction cost can be significantly reduced. In addition, by arranging a lightweight directional control bag at the middle or rear end of the front conductor, the work of installing a heavy jack in a narrow pipe as in the past is eliminated, and efficient pipe work is achieved. And improved safety. Furthermore, since the directional control bag has a simple structure, the seal between the piston and the cylinder is not damaged due to the uneven pressure as in the prior art, so that efficient propulsion work can be performed.

[0022]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating the arrangement of curved bags according to the curve forming method of the present invention.

FIG. 2 is a longitudinal sectional view illustrating a curve forming state of the present invention.

FIG. 3 is a cross-sectional view illustrating an arrangement state of a direction control bag which is a method for controlling the direction of a leading conductor according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Curve bag 2 Pipe material 3 Direction control bag 4 Switching valve 5 Supply pipe 6 Pump 7 Propulsion pipe 8 Lead conductor

Claims (2)

[Claims] 1. A curve holding method of a propulsion method in which a propulsion pipe is sequentially buried in the ground in a curved shape, wherein a bag for a curve in which high-strength fibers are sealed in a bag shape is manufactured. A fluid such as water or oil is injected and sealed into the bag body, and a plurality of the curved bag bodies are arranged in the circumferential direction of the end face of the propulsion pipe joint, and the curved bag bodies are communicated with each other by a pipe material. And a propulsion force transmitted through a curved bag body of each propulsion pipe joint so that the propulsion pipe follows the curved tunnel hole formed by the leading conductor. 2. A directional control bag body in which high-strength fibers are sealed in a bag shape is manufactured, and a plurality of the directional control bag bodies are arranged in a circumferential direction of an end surface of an intermediate portion or a rear end portion of a leading conductor, Each of the direction control bags is connected to a switching valve installed in a starting shaft or a pipe from each piping material, and the switching valve is connected to a pump that supplies fluid under pressure or under reduced pressure by a supply pipe, A direction control method for a front conductor, comprising deflecting a front conductor in a predetermined direction by inflating or reducing only a predetermined direction control bag from a switching valve by operating a pump.