JP2003232189A - Pipeline jacking apparatus and pipeline jacking method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipeline jacking apparatus and a pipeline jacking method, which allow a pipeline to be easily constructed in ground with a high degree of accuracy. <P>SOLUTION: In this pipeline jacking apparatus 5, a jacked pipe is pushed by a main push device 6 while being added to a back end of a leading body 7 for excavating underground, so that the leading body 7 can be jacked; the jacked pipe is buried by being pushed into the ground; one end of a wire 29 is connected to an outer peripheral part of the leading body 7; the other end thereof is connected to a balancer 32 which is installed on the side of the device 6; and a tensile force is applied to the wire 29 by the balancer 32, so that an attitude of the leading body 7 can be adjusted and so that a jacking direction can be controlled. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipeline propulsion device and a pipeline for constructing a pipeline for insertion of a communication cable, an electric wire, a water and sewer pipe, a gas pipe or the like in the ground without excavating the ground such as a road. Road promotion method.

[0002]

2. Description of the Related Art Conventionally, when constructing pipelines for passing communication cables, electric wires, water and sewer pipes, gas pipes, etc. in the ground, a deep groove is created by excavating the ground such as a road, and a buried pipe is inserted in this groove. Embedding has been done. However, in such a road excavation method, traffic must be cut off,
There is a problem that not only the road conditions are greatly affected, but also noise and vibration caused by excavating a deep groove with an excavating machine have a great influence on the living environment. Therefore, in recent years, a propulsion method has been developed and put into practical use, in which a lateral tunnel is dug into the ground without opening the ground and a duct is formed in the tunnel.

In carrying out this propulsion method, a starting shaft is dug in a part of the ground which is one end of the tunnel, and a reaching shaft is dug in the other end of the tunnel, and a front conductor and an original pushing device are installed in the starting shaft. Then, the leading conductor is pressed by the former pushing device while driving the cutter head provided at the tip end of the leading conductor, whereby the ground is excavated in the horizontal direction. When the front conductor advances by a predetermined stroke, a propulsion pipe is supplied to the rear end portion of the front conductor, and the propulsion pipe is further pressed by the original pushing device to advance the front conductor together with the propulsion pipe.

In this way, while advancing the propulsion pipe to the rear side of the front conductor, the front conductor is advanced to the reaching shaft,
A predetermined pipeline was built underground.

[0005]

However, when the above-mentioned propulsion method is applied to extremely soft ground such as alluvium or lake swamp ground, the ground is the cutter head provided at the tip of the conductor and this cutter head. In order to drive, the weight of a drive mechanism or the like mounted on the tip end side of the lead conductor cannot be withstood, and the tip end of the lead conductor may be inclined downward, so-called nose down may occur. If the lead conductor continued to excavate in the ground with the nose down, the pipeline constructed would incline so that it became lower as it proceeded in the propulsion direction, and there was the problem that it would deviate from the propulsion planning line.

[0006] Therefore, in order to solve the above problems, various methods, for example, shortening the distance between the starting shaft and the reaching shaft,
A method to reduce the deviation between the pipeline constructed in the construction of the one-time propulsion method and the propulsion planning line, the ground to the extent that the chemical solution is injected into the ground before the above propulsion method is installed and the nose-down of the precursor does not occur. How to harden the tunnel, excavate a tunnel with a diameter slightly larger than the tunnel normally formed to push in the propulsion pipe, and deviate between the constructed pipeline and the propulsion planning line between the propulsion pipe and this tunnel Methods such as absorption in space have been used. However, these methods have problems that the cost is too high and the construction is large.

Further, in the case of forming a conduit along a curved propulsion planning line, it is necessary to forcibly bend the propulsion direction of the preceding conductor. In such a case, conventionally, a plurality of hydraulic jacks are provided in the lead conductor, and the hydraulic jacks are driven to change the angle of the cutter head, thereby controlling the propulsion direction of the lead conductor. I was doing. However, this method also has a problem that the structure of the lead conductor is complicated.

An object of the present invention is to provide a pipeline propulsion device and a pipeline propulsion method capable of constructing a pipeline in the ground with high accuracy and with ease.

[0009]

According to the invention of claim 1, while adding a propulsion pipe to the rear end of the front conductor for excavating the ground,
In the pipeline propulsion device in which the propulsion pipe is pushed by the original pushing device to propel the front conductor, and the propulsion pipe is pushed and buried in the ground, one end of the tension transmission material is connected to the outer peripheral portion of the front conductor. The other end is connected to a tensioning means provided in the original pushing device, and the tensioning means applies tension to the tension transmitting material to adjust the attitude of the leading conductor and control the propulsion direction. And the pipeline propulsion device.

According to a second aspect of the present invention, there is provided the pipeline propulsion device according to the first aspect, wherein the tensioning means includes a tension control means for controlling the value of the tension applied to the tension transmission material.

A third aspect of the present invention is the pipeline propulsion device according to the first aspect, wherein a plurality of tension transmitting members are connected to the outer peripheral portion of the lead conductor in the circumferential direction so as to be separated from each other.

According to a fourth aspect of the present invention, while pushing the propulsion pipe to the rear end portion of the front conductor for excavating the ground by pushing the propulsion pipe with a pushing device, the front conductor is propelled to the ground. In the pipe propulsion method of pushing in and embedding the propulsion pipe, it is possible to control the propulsion direction by adjusting the posture of the leading conductor by applying tension to the tension transmitting material whose one end is connected to the outer peripheral portion of the leading conductor. It is a feature of the pipeline propulsion method.

According to the present invention, the propulsion direction of the lead conductor can be controlled easily and effectively.

[0014]

1 to 4 show a first embodiment of the present invention. 1 shown in FIG. 1 is a ground 2a in which pipelines for communication cables, electric wires, water and sewer pipes, gas pipes, etc. are constructed.
2 and 2b are the starting shaft and the reaching shaft respectively dug in the ground 1, 3 and 4 are the bearing wall and the wellhead wall provided in the starting shaft 2a, and L is the propulsion plan for constructing the pipeline. It is a line.

Inside the starting shaft 2a, the pipe propulsion device 5 of the present invention is installed. The conduit propulsion device 5 includes a source pushing device 6 and a leading conductor 7. The original push device 6 is
At the bottom of the starting shaft 2a, there is a pedestal 11 provided along the propulsion planning line L and having a substantially rectangular plane. This stand 11
A guide member 12 is provided along the longitudinal direction substantially at the center in the width direction of the upper surface of the base plate 13, and a base plate 13 is provided at one longitudinal end.
Is provided so that one side surface thereof is joined to the bearing wall 3.

A cylinder 14a of the first hydraulic jack 14 is fixed to the other side surface of the base plate 13. A drive device (not shown) is connected to the first hydraulic jack 14, and the drive shaft 14b of the first hydraulic jack 14 is moved in the longitudinal direction of the gantry 11, that is, by operating the drive device. The vehicle can be driven back and forth along the propulsion planning line L.

Drive shaft 14 of the first hydraulic jack 14
A disc-shaped push ring 15 is provided substantially vertically at the tip of b. The push wheel 15 is slidably supported along the longitudinal direction of the guide member 12 by the sliding portion 15a formed in the lower portion thereof engaging with the guide member 12. As described above, the push ring 15 is connected to the guide member 12 by
By being guided by, the vehicle is smoothly driven back and forth along the above-mentioned promotion plan line L.

The first hydraulic jack 1 of the push wheel 15
The front conductor 7 is detachably connected to one side surface on the side opposite to 4. As shown in FIG. 2, the leading conductor 7 has a leading tubular body 21 made of a tubular body. A cutter head 22 is provided at the tip of the leading tubular body 21, and by driving a hydraulic motor 23 mounted on the tip side of the inside,
The earth and sand can be excavated.

That is, the leading conductor 7 drives the cutter head 22 at the tip end portion thereof, and at the same time, the push wheel 1 of the former pushing device 6 is driven.
By pressing the rear end portion by 5, it is possible to dig into the ground along the propulsion planning line L.

The cutter head 22 is provided with a jet port (not shown), and the mud material can be supplied from the jet port to the tip side of the front conductor 7 which is dug into the ground. There is.

As shown in FIG. 3, a plurality of guide cylinders 21 are provided along the longitudinal direction on the outer peripheral portion of the guide cylinder 21, and in this embodiment, there are three.
One earth removal groove 24 is formed at an interval of approximately 60 degrees with respect to the circumferential direction. It should be noted that one (24a) of these earth discharging grooves 24 is formed on the uppermost part of the above-mentioned front conductor 7.

As shown in FIG. 2, an earth discharging port 25 is formed in the middle of each earth discharging groove 24 so as to open to the inside of the leading cylindrical body 21. One end of an earth discharging pipe 26 is connected to each earth discharging port 25. Each of the soil discharge pipes 26 has a pressure feed pump 27, and the other end is connected to a soil discharge tank (not shown) provided on the ground.

One end of a wire 29 as a tension transmitting material is connected via a hook 28 to the rear side of the earth discharging port 24 in the earth discharging groove 24a set at the uppermost portion of the leading tubular body 21. . The wire 29 has a gripper 30 in the middle thereof, and the other end side thereof has the starting shaft 2 as shown in FIG.
It is wound up by the winding portion 41 provided in a.

As shown in FIG. 4, one end of a tension wire 31 is connected to the gripper 30. The other end of the tension wire 31 is connected to a tensioner provided on the upper part of the push wheel 15 and a balancer 32 as a tension control means via an engagement ring 33, and a loosening machine 34 is provided in the middle. ing.

The balancer 32 has a frame 35. The frame 35 is formed in a substantially rectangular box shape by connecting four corners of a pressing plate 36a and a pulling plate 36b provided with the engaging ring 33, which are arranged in parallel and facing each other, with connecting rods 37, respectively. And each connecting rod 37
Is inserted into a through hole 38 formed in the push wheel 15, so that the push wheel 15 is slidably provided.

A second hydraulic jack 39 is provided between the push wheel 15 and the push plate 36a. This second
The cylinder 39a of the hydraulic jack 39 of FIG.
6b is fixed to the inner surface, and the tip of the drive shaft 39b is fixed to the inner surface of the pressing plate 36a.

The second hydraulic jack 39 has a pressure adjusting device (not shown). This pressure adjusting device is connected to an attitude sensor (not shown) which is provided inside the leading conductor 7 and detects the attitude of the leading conductor 7, and the attitude of the leading conductor 7 detected by the attitude sensor on the drive shaft 39b. Cylinder 3 so that the propulsive force according to
The hydraulic pressure in 9a is controlled.

That is, the balancer 32 is interlocked with the attitude sensor and is connected to the wire 2 via the tension plate 36b.
A required tension, that is, a required load that resists a rotational moment generated in the lead conductor 7 as described later, can be applied to the cable 9 and the tension wire 31.

The frame 35 has a drive shaft 39b.
It is set so that a predetermined gap is formed between one side surface of the push ring 15 and the inner side surface of the tension plate 36b at the maximum extension of. That is, the tension plate 36b and the push wheel 15 interfere with each other so that the extension drive of the drive shaft 39b is not hindered.

Next, the operation of using the pipeline propulsion device 5 having the above-mentioned structure will be described.

When the pipe propulsion device 5 is installed in the starting shaft 2a, it is confirmed that the middle part of the wire 29 is gripped by the gripper 30 and the relaxation machine 34 removes the wire 29 and the tension wire 31. Remove slack. Next, the cutter head 22 provided at the tip of the leading conductor 7 is driven, and the rear end of the leading conductor 7 is pressed by the push wheel 15 of the former pushing device 6. As a result, as shown in FIG.
Dig along.

If the leading conductor 7 digs into the ground to approximately half the stroke of the first hydraulic jack 14,
The grip of the wire 29 by the gripper 30 is released, and as shown in FIG.
The first propulsion pipe 53 is supplied to the rear side of the front conductor 7. Then, the middle part of the wire 29 is gripped by the gripper 30, and the first propulsion pipe 53 is pressed by the original pushing device 6, whereby the front conductor 7 is moved to the first propulsion pipe 5.
Move forward with 3.

When the lead conductor 7 and the first propulsion pipe 53 have advanced in the ground to approximately half the stroke of the first hydraulic jack 14, the gripper 30 releases the grip of the wire 29, As shown in FIG. 7, the rear end of the first propulsion pipe 53 is separated from the push ring 15,
The second propulsion pipe 54 is supplied to the rear side of the first propulsion pipe 53. Then, the middle part of the wire 29 is gripped by the gripper 30, and the second propulsion pipe 54 is pressed by the former pushing device 6.

In this way, the front conductor 7 is connected to the rear side of the front conductor 7 while the front conductor 7 is connected to the propulsion planning line L.
Along with to reach the vertical shaft 2b, a predetermined pipe path is built in the ground by the propulsion pipe added to the rear side of the front conductor 7.

The leading tube 2 is used as the propulsion pipe.
A fume tube or the like having an outer diameter slightly smaller than the outer diameter of 1 is used. That is, an excavation void 52 of about 20 to 30 mm is formed between the inner peripheral surface of the tunnel 51 and the outer peripheral surface of each propulsion pipe formed by the forward conductor 7 excavating in the ground.

At this time, as shown in FIGS. 5 to 8, the leading conductor 7 advances while pulling out the wire 29 from the winding portion 41, and the wire 29 pulled out from the winding portion 41 Excavation groove 24 of the leading cylindrical body 21
a and the inside of the excavation void 52 of the outer peripheral portion of the propulsion pipe.

When the leading conductor 7 is dug into the ground, a mud making material is supplied to the tip end side of the leading conductor 7 from a jet port (not shown) provided in the cutter head 22. As a result, the excavated earth and sand formed by the cutter head 22 is mixed with the mud making material and becomes mud having water stopping property and fluidity.

Most of the mud excavated earth and sand is transferred in the earth discharging groove 24 formed on the outer peripheral surface of the leading cylindrical body 21, and the leading cylindrical body 2 is discharged from an earth discharging port 25 formed in the middle thereof.
It is captured in 1. The excavated earth and sand taken into the leading tubular body 21 is discharged by the pressure pump 27 through the earth discharging pipe 26 to the earth discharging tank provided on the ground.

Part of the mud excavated earth and sand is transferred to the rear end side of the leading cylinder 21 in the earth discharge groove 24 and flows into the excavation void 52. As a result, the outer peripheral portion of each of the propulsion pipes is filled with the mud, which makes it difficult for groundwater or the like to enter the excavation void 52.

Due to the weight of the cutter head 22 provided at the tip of the leading conductor 7 and the hydraulic motor 23 provided at the tip of the inside of the leading conductor 7, the center of the point indicated by the center of rotation P in FIG. , A rotational moment that tries to rotate in the direction indicated by the arrow X acts. Normally, this rotational moment is supported by the ground reaction force, but when using the above-mentioned pipeline propulsion device 5 on soft ground or the like, the ground cannot withstand the above weight, and the leading conductor 7 causes nose down. .

When the lead conductor 7 causes the nose down, the balancer 32 applies the required tension to the wire 29 and the tension wire 31 to resist the rotational moment generated in the lead conductor 7. That is, the counter conductor 7 has a counter-rotational moment that tries to rotate about the rotation center P in the direction indicated by the arrow Y, and the tip portion of the front conductor 7 is pulled upward.

According to the pipeline propulsion device 5 having the above-described structure, the posture of the leading conductor 7 is constantly monitored, and when the leading conductor 7 causes nose down, tension is applied to the wire 29 to correct the posture. It has become. Therefore, even in extremely soft ground, the propulsion direction of the leading conductor 7 can be controlled, so that the pipeline can be accurately constructed along the propulsion planning line L.

Further, since the construction accuracy is improved, it is possible to construct a long distance and a curve, and the time required for direction correction is shortened, so that the construction period can be shortened. Moreover,
Since it is sufficient to connect the wire 29 to the outer peripheral portion of the lead conductor 7 and to provide the push ring 15 with a mechanism for applying a tension to the wire 29, it is not necessary to change the configuration of the lead conductor 7 in particular.
It can be applied to various precursors at low cost. Furthermore, when the lead conductor 7 is removed after the completion of the pipeline propulsion method, the wire 29 can be easily removed.

Further, the wire 29 is connected to the uppermost part of the leading conductor 7. Therefore, the distance between the center of rotation P and the point of application of the tension of the leading conductor 7 becomes large, so that the leading conductor 7 can be pulled up with a smaller force.

Further, the wire 29 is connected to the lead conductor 7 by
The wire 29 is prevented from being cut by friction with the inner wall of the tunnel 51, because the wire 29 is provided so as to be inserted through the earth discharging groove 24a and the excavation void 52.
Moreover, since the excavation void 52 is filled with fluid mud, the resistance applied to the wire 29 during tension is reduced. In addition, since ground improvement such as chemical injection is not required, groundwater is not polluted.

9 and 10 show a second embodiment of the present invention. This embodiment is a modification of the tip conductor 7, and the wire 29 is not limited to the earth discharge groove 24a formed in the upper portion of the tip conductor 7, but the wires 29 are respectively provided in the three earth discharge grooves 24. One end of is connected.

The balancer 32 is provided at a position corresponding to each wire 29 of the push wheel 15, and the other end of each wire 29 is connected to the balancer 32. As a result, even when constructing a pipeline along a curved planning line, each balancer 32
By controlling the magnitude of the tension applied to each wire 29 by means of, it is possible to freely and easily change the propulsion direction of the above-mentioned conductor 7, so that the pipeline is constructed accurately and easily along the propulsion planning line. be able to.

The pipe propulsion device 5 and the pipe propulsion construction method are particularly effective in the construction work of a pipe having a small diameter of 800 mm or less that cannot be entered by an operator.

[0049]

According to the present invention, the posture of the lead conductor can be easily controlled, so that the pipeline can be constructed with high precision along the propulsion planning line.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a first embodiment of the present invention.

FIG. 2 is a schematic view of a leading conductor according to the same embodiment.

FIG. 3 is a sectional view taken along the line AA of FIG.

FIG. 4 is a block diagram of a balancer.

FIG. 5 is a first explanatory diagram when using the pipeline propulsion apparatus of the same embodiment.

FIG. 6 is a second explanatory view when using the conduit propulsion device of the same embodiment.

FIG. 7 is a third explanatory diagram when using the conduit propulsion device of the same embodiment.

FIG. 8 is a fourth explanatory diagram when the conduit propulsion device of the embodiment is used.

FIG. 9 is a schematic view of a leading conductor according to a second embodiment of the present invention.

10 is a cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

5 ... Pipe propulsion device 6 ... Original push device 7 ... Leader 29 ... Wire 32 ... Balancer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Togo Sato             4-6-14 Kawajiri, Kumamoto City, Kumamoto Prefecture             Business F-term (reference) 2D054 AA02 AC18 GA04 GA33

Claims (4)

[Claims] 1. A thrust pipe is added to a rear end portion of a front conductor for excavating the ground, and the thrust pipe is pressed by a pushing device to propel the front conductor to push the thrust pipe into the ground. In the pipeline propulsion device to be buried in, the one end of the tension transmitting material is connected to the outer peripheral portion of the leading conductor, and the other end is connected to the tensioning means provided in the original pushing device. A conduit propulsion device characterized by adjusting the attitude of the above-mentioned conductor and controlling the propulsion direction by applying tension to the material. 2. The pipeline propulsion device according to claim 1, wherein the tensioning means includes a tension control means for controlling the value of the tension applied to the tension transmission material. 3. The pipeline propulsion device according to claim 1, wherein a plurality of tension transmitting members are connected to the outer peripheral portion of the leading conductor in the circumferential direction so as to be separated from each other. 4. A thrust pipe is added to the rear end of a front conductor for excavating the ground, and the thrust pipe is pressed by a pusher device to propel the front conductor to push the thrust pipe into the ground. In the pipeline propulsion method to be buried in, the pipeline is characterized by adjusting the posture of the leading conductor and controlling the propulsion direction by applying tension to the tension transmitting material connected to the outer periphery of the leading conductor at one end. Propulsion method.