JPH037798B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a controlled burial method using a trenchless construction method and a device suitable for carrying out the method.

2. Description of the Related Art Trenchless burying methods have been known for burying relatively small-diameter pipes such as gas pipes and water pipes on roads with heavy traffic or in urban areas. This construction method generally involves laying a pilot pipe from a starting shaft to a destination shaft, and then sequentially burying the main pipe along the pilot pipe while enlarging the hole with a drilling head.

Various types of excavation heads have been known in the past, and the present inventor previously published Japanese Patent Application No. 56-106290 (Japanese Unexamined Patent Publication No. 58-11298).
A new excavation method has been proposed. In this construction method, a pilot pipe is excavated and penetrated from the starting shaft to the reaching shaft, and a drilling head is connected to the tip of the pilot pipe that has penetrated to the reaching shaft, and the pipe to be buried is connected to the kneading excavation head, and the pilot pipe is inserted through the pilot pipe. By rotating only the excavation head and drawing it toward the starting shaft side, the hole is expanded and the pipe to be buried that is to be taken to the excavation head is buried. By the way, in such a construction method, in order to discharge the waste soil generated by hole-expanding excavation, a method is adopted in which the waste soil is made into a slurry and the slurry is sucked and discharged. That is, water is supplied into the excavation head from the starting shaft side through a pilot pipe to turn the waste soil taken into the excavation head into a slurry, and this slurry-formed waste soil is taken to the excavation head by a pump and a discharge pipe. It is designed to be discharged to the reaching shaft side through a pipe planned to be buried. However, with this method of supplying water from the starting shaft side and discharging waste soil to the reaching shaft side, it is necessary to install water-related equipment separately in the flowing shaft, and when water is circulated, it is necessary to install water-related equipment separately in the reaching shaft. There is a problem in that the water that has been treated on the side needs to be sent back to the starting shaft using a hose or the like.

The present invention was devised in view of these problems, and aims to provide a construction method that can supply water and discharge waste soil in one shaft, and a structure of an excavation head suitable for carrying out the method. be.

Therefore, in the present invention, a drilling head having a drilling bit and an earth intake port on the front side is connected in the reaching shaft to the tip of a pilot pipe that penetrates from the starting shaft to the reaching shaft, and a rotary shaft is connected to this drilling head. A pipe to be buried is connected to the pipe through a rotary joint having a through hole, and the pipe to be buried is brought to the excavation head by drawing it to the starting shaft side while rotating only the excavation head and drilling to expand the hole. A pipe is buried, and during the management installation process, water for slurrying is introduced into the excavation head by a water introduction pipe led from the reaching shaft side through the pipe to be buried and the through hole of the rotating shaft that constitutes the rotary joint. Then, the water for slurrying is supplied to a water injection hole provided near the front of the head main body, and on the other hand,
The basic feature is that the soil slurry taken into the head from the soil intake port is discharged by a soil discharge pipe that is guided to the reaching shaft side through the through hole and the planned buried pipe.

In addition, in order to suitably carry out such a method, a head body is provided with an excavation head and an earth removal inlet on the front side, and a pipe body is rotatably connected to the rear end of the head body via a rotary joint. The rotary shaft constituting the rotary joint is a drilling head having a through hole in the axial direction, and has a connecting portion with a pilot pipe at the tip on the front side of the head body, and an opening inside at the rear end side. a rod having a water flow hole, the rod having a water injection hole extending from the water flow hole to the vicinity of the front surface of the head body;
A water introduction pipe and a waste soil discharge pipe led from the reaching shaft side through the pipe to be buried are guided into the head main body through the through hole while being supported within the pipe, and the end of the water introduction pipe is connected to the rear end of the rod. , is rotatably connected to communicate with the opening.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments and drawings.

The drawings show one embodiment of the device of the present invention.
A is the excavation head, B is a pipe to be buried (hereinafter referred to as a buried pipe) connected to the excavation head, and C is a pilot pipe.

The excavation head includes a head body 1 and a head body 1.
The tube body 2 is rotatably connected to the rear part of the body via a rotary joint 3. Said rotary joint 3
is composed of a rotating shaft 4 fixed to the head body 1 side, and a bearing 5 fixed to the tube body 2 side to hold the rotating shaft 4. The rotating shaft 4 has a through hole 6 in the axial direction.

An excavation bit 7 and a soil intake port 8 are provided on the front surface of the head body 1, and the soil produced by excavation with the bit is taken into a hollow portion 9 in the head body from the soil intake port 8. These structures will be explained in detail later. At the center of the front surface of the head body 1, there is a rod 1 whose rear end is housed in the hollow part 3 inside the head body 1 and along the axis of the head.
0 is set. This rod 10 has a pilot tube connection portion 11 (female threaded portion) formed at its tip, and an opening 121 inside at the rear end of the rod.
It has water flow holes 12. Also, from this water flow hole 12, there is a water injection hole 1 near the front of the head body.
3 is extending. In this embodiment, a water injection hole 13a opened on the front surface of the bit holding member 14, which will be described later, is used.
and a water injection hole 13b opened at the front of the head body 1.
Two types are formed.

Water introduction pipe 1 from the reaching shaft side through the buried pipe
5 and an earth discharge pipe 16 are guided, and these pipes are guided into the hollow part 9 of the head body 1 through the through hole 6 of the rotating shaft 4 while being supported within the pipe body 2, and are further led to the hollow part 9 of the head body 1. An end of the introduction tube 15 is rotatably connected to the rear end of the rod 10 so as to communicate with the opening 121 thereof. In this example,
First, the tube body 151 constituting the water introduction tube 15 is loosely inserted into the through hole 6 while the rear end is held on the tube body 2 side.
Further, it is rotatably supported by a bearing 17 provided in the through hole 6. The tube body 151 has a small diameter tube portion 1510 with an open end at its distal end, and this small diameter tube portion 1510 is fitted into the opening 121 of the rod 10 so as to be rotatable in the circumferential direction. Further, a tube body 152 is connected to the rear end side of the tube body 151 from the direction of the buried pipe. Further, the soil discharge pipe 16 is loosely inserted into the tube body 151 so as to pass through the closed rear end thereof, and is fixedly held by the tube body 151.
This soil discharge pipe 16 has a distal end portion that is connected to the pipe body 1.
It penetrates the tube wall of 51 and opens at the end inside the hollow part 9. In this embodiment, in order to support the water introduction pipe 15 and the waste soil discharge pipe 16 within the through hole 6 by the bearings 17, both pipes are constructed into a double pipe structure as described above. For example, such a bearing 1
If the support structure in the through hole 6 according to 7 is not adopted, it is possible to loosely insert the soil discharge pipe 16 and the water introduction pipe 15 into the through hole 6 separately.

In addition, other configurations of this embodiment will be explained as follows.
In this embodiment, if gravel is caught in the soil intake port 8 for taking the soil into the head body 1, a mechanism is provided to remove it. A mounting hole 18 is provided in the central portion while forming a guide cylindrical portion 181, and the rod 10 is fitted into the mounting hole 18 so as to be movable in the axial direction of the head body. This inserted rod portion is configured in the shape of a spline shaft with a predetermined length, and the rod portion 1
Rotation in the circumferential direction of 0 is prevented.

There is a stepped part 10 for a stopper on the tip side of the rod 10.
1 is formed, and a ring 19 is formed on the rear end side.
Similarly, a stepped portion 102 for a stopper is formed, and the forward and backward stroke of the rod 10 is determined by these stepped portions coming into contact with the front and rear edges of the mounting hole 18.

A hood-shaped bit holding member 14 is attached to the rod 10, the shape of which substantially corresponds to the front end of the head body. The bit holding member 14 has a tapered front surface and a short tubular skirt portion 141 at the rear portion, and the inner circumferential surface of the skirt portion 141 slides on the circumferential surface of the head body 1 in the longitudinal direction of the head body. possible contact. The circumferential surface of the head body 1 on the tip side that the skirt portion 141 comes into contact with is the skirt portion 1
In order to absorb the thickness of 41, the diameter is smaller than that of the main body.

Several excavation heads 7 are provided in the radial direction on the front surface of the bit holding member 14, and a slit-shaped soil intake port 8a for taking the soil into the inside of the bit holding member 14 is provided near each of the digging heads 7. It is provided in the radial direction. In addition, the head body 1
A slit-shaped soil intake port 8b facing in the radial direction is also provided on the front surface of the container. The discharging soil intake port 8a of the bit holding member and the discharging soil intake port 8b of the head body 1 are provided with their positions shifted in the circumferential direction.

Projecting members 20b and 20a are provided on the front surface of the head main body 1 and the back surface of the bit holding member 14 so as to face the discharged soil intake port of the bit holding member 14 and the discharged soil intake port of the head body 1, respectively. , by retracting the bit holding member 14 toward the head body, each protruding member 20a, 2
0b can be pushed into the opposing soil intake ports 8b and 8a. Projection member 20a,
In this embodiment, 20b is composed of a plate-shaped body. In addition, since the rod 10 advances and retreats in this way,
The small diameter tube portion 1510 is capable of sliding in the axial direction with respect to the opening 121.

Further, in this embodiment, a valve 21 for adjusting the amount of soil taken in is provided inside the soil intake port 8b provided on the front surface of the head main body 1. This valve 2
1. When excavating soft ground, etc., taking in too much surrounding soil into the head body 1 may cause the soil wall to collapse, so the amount of soil taken in should be adjusted appropriately. It is an object. That is, a ring-shaped holding body 22 is fitted onto the outside of the guide cylinder portion 181 so as to be able to slide in the axial direction of the guide cylinder, and an arm 23 extends from the holding body 22 in the direction of each soil removal intake port 8b. At the tip, there is a valve 2 that should close each discharged soil intake port 8b.
1 is installed. In addition, the guide cylinder part 181
A spring 25 whose one end is locked to the stopper 24 is mounted on the outside, and this spring 25 presses the holder 22 toward the tip of the rod 10. In this pressed state, the holder 22 is attached to the guide cylinder portion 18
Each valve 21 closes each discharged soil intake port 8b. Each valve 21 is pushed in against the elastic force of the spring 25 due to the earth pressure applied to the front surface, and the discharged soil is taken into the head from the discharged soil intake port 8b.

In addition, in other drawings, 26 is a driving water supply pipe led from the reaching shaft side through a buried pipe and connected to the waste discharge pipe 16, and the driving water supply pipe 26
A water jet pump is formed in the waste soil discharge pipe 16 by the drive water supplied from the pump, and the suction force of this pump sucks the waste soil slurry in the hollow part 9, so that it can be fed to the reaching shaft side. . Further, 27 and 28 are seals.

Next, to explain the present invention in detail based on the embodiments described above, as shown in FIG. 11
The shaft is attached through the shaft, and the hole is drilled while being drawn toward the starting shaft A side. In other words, Hetsudoi is
Only the head body 1 is rotated and pulled by the pilot pipe which is rotated by the driving force of the drive device 29 and retreats in the direction of the starting shaft, and the ground is enlarged and excavated by the excavation bit on the front side. The pipe body 2 carries the buried pipe at its rear part and follows the head body 1 in a non-rotating state. The buried pipe led to the excavation head is added to the destination shaft B side as the head advances, and the burial is completed when the excavation head reaches the starting shaft A side. In addition, in such a management installation process, the rear end of the buried pipe L may be pressed by a pressing device on the reaching shaft B side to supplement the propulsive force of the buried pipe L.
In addition, without using the above-mentioned pressing device, excavation is performed so that a gap is created between the buried pipe and the soil wall of the excavation hole, and an anti-friction agent is press-fitted into this gap to increase the peripheral surface resistance with the soil wall. It is possible to perform excavation while reducing the

In addition, in the above-mentioned excavation and management installation process, the water introduction pipe 15 and the soil discharge pipe 16 follow the head body 1 in a non-rotating state together with the pipe body 2 and the buried pipe rod, so that the rod body 10 at the rear end The small diameter pipe portion 1510 of the water introduction pipe 15 is inserted into the opening 121 and rotates relative to the water introduction pipe 15 .

In this process, slurry water is supplied to the excavation head side by the water introduction pipe 15 led from the reaching shaft side through the buried pipe, and the slurry water passes through the head body and enters the water flow hole. 1
2 and the water injection holes 13a and 13b to the vicinity of the front surface of the head body, that is, in this embodiment, the front surface of the bit holding member 14 and the space 30 inside the bit holding member.
Each head is sprayed onto the front surface of the head body 1 inside.

The waste soil generated by excavation is slurried by the slurry water, first taken into the inner air space 30 from the waste soil intake port 8a of the bit holding member 14, and then taken into the main body from the waste soil intake port 8b on the front surface of the head main body 1. It is guided into the hollow part 9 inside. The soil slurry in the hollow portion 9 is sucked from the end of the soil discharge pipe 16 and discharged in the direction of the reaching shaft B through the buried pipe.

In this way, in the present invention, slurry water can be supplied from the arrival shaft side of the pilot pipe, and the waste soil generated by excavation can also be discharged to the starting shaft side, so that water treatment equipment or other water-related All devices can be installed on the starting shaft side.

In addition, to explain other functions of the device of the present invention, during the above-mentioned excavation process, if the soil intake port 8
If gravel or the like gets stuck in a and 8b, clogging them, stop the excavation once and push the pilot pipe back toward the excavation head on the starting shaft side. As a result, the rod 10 slides through the mounting hole into the head main body, and along with this, each protruding member 20a, 2
0b is pushed into the opposing earth discharge intake ports 8b and 8a, and the trapped gravel is pushed out to the outside of the bit holding member or into the head main body. after that,
By pulling the pilot tube, the rod 10 slides back to its original position, and in this state excavation can be resumed.

According to the present invention described above, it is possible not only to efficiently perform long-distance drilling in a single excavation process without using large jacks or the like and regardless of the soil quality, but also All the supply and discharge of waste slurry can be done on the reaching shaft side, so it is sufficient to install water-related equipment such as water treatment equipment only in the reaching shaft, and it is also easy to recycle water. It has the advantage of being able to

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the device of the present invention, in which Figure 1 is a longitudinal sectional view, Figure 2 is a sectional view taken along the line - in Figure 1, and Figure 3 shows a rod. FIG. 3 is a front view of the head body shown in cross section. Fourth
The figure is an explanatory diagram showing the implementation status of the method of the present invention. In the figure, 1 is the head body, 2 is the pipe body, 3 is the rotary joint, 4 is the rotating shaft, 6 is the through hole, 7 is the excavation bit, 8a, 8b are the soil intake ports, 9 is the hollow part, 1
0 is the rod, 11 is the connection part, 12 is the water flow hole, 13
a, 13b are water injection holes, 15 is a water introduction pipe, 16 is an earth discharge pipe, 121 is an opening, A is an excavation head, B is a pipe to be buried, C is a pilot pipe, A is a starting shaft, B is a destination shaft It is.

Claims (1)

[Scope of Claims] 1. A drilling head having a drilling bit and an earth intake port on the front side is connected in the reaching shaft to the tip of the pilot pipe that penetrates from the starting shaft to the reaching shaft, and a rotating Connect the pipe to be buried via a rotary joint with a through hole in the shaft,
By rotating only the excavation head through the pilot pipe and pulling it toward the starting shaft side and drilling to expand the hole, the pipe to be buried that will be taken to the excavation head is buried, and during this management installation process, the inside of the pipe to be buried and the Slurry water is introduced into the excavation head by a water introduction pipe led from the reaching shaft side through the through hole of the rotating shaft that constitutes the rotary joint.
The slurry-forming water is supplied to a water injection hole provided near the front of the head body, while the soil slurry taken into the head from the soil intake port is passed through the through hole of the rotary joint and the pipe to be buried. A management installation method using a trenchless construction method, which is characterized by discharging soil through a discharge pipe led to the reaching shaft side. 2. Consisting of a head body provided with an excavation bit and an earth removal inlet on the front surface, and a pipe body rotatably connected to the rear end of the head body via a rotary joint, the rotary joint constituting the rotary joint The shaft is a drilling head having a through hole in the axial direction, and a rod body is provided on the front surface of the head body, the rod body having a connection part with a pilot pipe at the tip and having a water flow hole opened at the rear end side inside. The rod is provided with a water injection hole extending from the water distribution hole to the vicinity of the front surface of the head body, and a water introduction pipe and waste soil discharge that are led from the reaching shaft side through the pipe to be buried. A trenchless construction method in which a pipe is guided into the head body through the through hole while being supported within the pipe, and the end of the water introduction pipe is rotatably connected to the rear end of the rod so as to communicate with the opening thereof. Management equipment.