JPS59118997A - Drill head in horizontal long distance drilling - 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] Akira Hongo is concerned with excavation heads for long-distance excavation methods.

BACKGROUND ART Trenchless burying methods have been known for burying relatively small diameter pipes such as gas pipes and water pipes in 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 this drilling head have been known in the past), and the inventor of the present invention previously filed a patent application filed in
A new drilling head has been proposed as No. 106290. This drilling head is connected to the tip of a pilot pipe that has penetrated to the arrival shaft, and is designed to perform hole expansion drilling while being drawn toward the starting shaft through the pilot pipe. It has a bit, has a waste soil intake port formed near the bit, and is rotatably connected to a subsequent buried pipe.

Then, the excavated soil excavated by the bit is taken into the head through the inlet and sent out to the outside.

However, after further investigation, it was found that such a drilling head also had one problem. In other words, the ground contains gravel of Kti size, but some of this gets stuck in the soil removal port of the head.
This poses a problem in that it hinders the subsequent intake of excavated soil, resulting in the inability to excavate and a decrease in efficiency.

The present invention was devised in view of these problems.
It is an object of the present invention to provide an excavation head that can appropriately prevent clogging of the soil intake port due to gravel or the like.

Therefore, in the present invention, the head is composed of a head body and a tube body connected to the rear part of the head body, the head body is configured to have a smaller diameter than the tube body, and the head body (and the buried A drum part eccentric to the axis of the pipe is provided, and the drum part is inserted into the pipe body to rotatably connect the head body and the pipe body, and the space between the drum part and the end of the pipe body is removed. It is configured as an earth intake port, and the rotation of the drum part eccentric to the pipe body crushes the gravel caught in the soil intake port between the drum part and the inner surface of the pipe body.
In addition, by providing an excavation bit with a head body configured to have a smaller diameter than the pipe body, a part of which protrudes outward beyond the outer diameter of the head body, a gap is created between the head body and the soil wall. The excavation is carried out in this way, and the υ soil is guided to the soil intake port through this gap, and the size of the gravel to be guided to the soil intake port can be selected depending on the size of this gap. This is what I did.

Hereinafter, the present invention will be described with reference to the drawings.

In the figure, (a) is the excavation head of the present invention, (b) is a buried pipe connected to the rear part of the excavation head and carried there, and (c) is a pilot pipe.

The excavation head of the present invention consists of a cylindrical head body 1 and a tube body 10 connected to the rear part of the head body 1.

(3) The head body 1 has a smaller diameter than the tube body 10, and has a connecting portion 2 at the center of its tip to which a pilot tube (c) is to be connected. Further, the same tip surface is configured in a conical shape, and the drilling bit 3 is provided here. A part of this excavation bit 3 protrudes outward beyond the outer diameter of the head body, thereby creating a gap 4 between the head body 1 and the soil wall (w). We are making it possible to do this. In this embodiment, the drilling bit 3 is designed such that the diameter of the drilling hole thereby approximately matches the outer diameter of the pipe body 10.
Its protrusion length is adjusted. In this invention, this gap 4
serves to guide the waste soil to the rear intake port. More specifically, with respect to the size l of the gap 4, earth, sand, and gravel with a particle size below a certain standard are sequentially sent backward, and gravel that exceeds the above standard is rotated without being sent backward. Head body 1
Therefore, as the size l of the gap 4 increases, the size of the gravel sent backward also increases. Therefore, the size l of the gap 4 increases Determine by considering the size of the soil intake port (
4) I like it. That is, the size l of the gap 4 is such that only earth, sand, and gravel with a diameter that can be caught in the soil intake port are sent backward, and larger diameter gravel can be compressed against the soil wall. is preferably selected.

On the other hand, a drum section 5 is provided at the rear of the head body 1. This drum portion 5 is provided eccentrically with respect to the axis of the head body 1.

A tube body 10 is connected to the rear part of the head body 1. The drum section 5 at the rear of the head body is inserted into the tube body 10, and the head body 1 and the tube body 10 are positioned coaxially through a shaft section 6 provided at the rear of the drum section 5. Rotatably connected.

In this embodiment, both are rotatably connected by a rotary joint 1. The rotary joint 7 includes a rotating shaft fixed to the head body 1 side and a bearing fixed to the tubular body 10 side to hold the rotating shaft.

In this state, the drum section 5 is located eccentrically within the tube body 10, and a gap is formed between the drum section 5 and the inner surface of the tube body 10, and a gap is formed between the rear end of the head body 1 and the tube body 10. There is also a predetermined distance between the ends of the .

In the present invention, the space between the end of the tubular body 10 and the drum portion 5 constitutes an annular soil intake port 8.

Further, in this embodiment, the rear part of the drum part 5 is
The drum part 5' has a larger diameter and is coaxial with the head body 1. Moreover, the above drum parts 5 and 5
A plurality of blades 9 along the longitudinal direction of the buried pipe are provided along the circumferential direction on the inner surface of the pipe body 10 facing .

In addition, in this embodiment, the main body portion of the tube body 10 is configured to have a larger diameter than the buried pipe (b), and only a portion of a predetermined length at the rear thereof is configured to have the same diameter as the buried pipe (b). .

A discharge port 12 for the lubricant is provided in the small diameter portion 101 of the tubular body 10, and the lubricant can be discharged from the discharge port 12 via a pipe 13. Further, the head main body 1 is configured to have approximately the same diameter as the buried pipe (b).

Next, the operation of the present invention will be explained.

As shown in Fig. 2, the drilling head (A) of the present invention is attached to the pilot (7) pipe (C) that penetrates from the starting shaft to the reaching shaft (B) via its connecting part 2, and is attached to the starting shaft ( Hole expansion drilling is performed while being drawn to the A) side.

That is, the drilling head (A) is indexed while only the head body 1 is rotated by the pilot pipe (C) which retreats in the direction of the starting shaft while being rotated by the driving force of the drive device 14. Excavate the hole in the ground. A buried pipe (b) is connected to the rear part of the tube body 10 by welding or the like, and the pipe body 10 follows the head body 1 in a non-rotating state together with this buried pipe (b). The buried pipe (b) led to the excavation head (a) is added on the arrival shaft (B) side as the head advances, and when the excavation head (a) reaches the starting shaft (A), the buried pipe (b) is is completed. In addition, in such a management installation process, the rear end of the buried pipe (B) may be pressed by a suppression device on the reaching shaft (BJ side) to supplement the propulsive force of the buried pipe (B). Without using equipment, excavation is performed by creating a gap between the buried pipe and the soil wall of the excavation hole, and an anti-friction agent is injected into this gap to reduce the peripheral resistance with the soil wall. Excavation can be done.

(8) In the process of such excavation, the waste soil generated by the excavation is taken into the pipe body 10 from the waste soil intake port 8 through the gap 4 between the head body 1 and the earth wall (w), and is absorbed into the pipe body 10. It is discharged to the reaching shaft side by the pump 11 on the other side. On the other hand, if the gravel exceeds the predetermined size for the gap 4, the gravel intake port 8
It is compacted by the head main body 1 without being sent in any direction, and is embedded in the earthen wall (w). In addition, other gravel (those smaller than a predetermined size) is sent rearward by the action of the gap 4 and taken into the soil removal port 8. The gravel taken into the tube body 10 is crushed between the drum part 5 that rotates eccentrically inside the tube and the inner surface of the tube (in this embodiment, a blade is provided), and is sent into the tube together with other earth and sand. . In this way, in the present invention, since the drum section 5 is always rotating eccentrically with respect to the pipe body 10, the gravel caught in the soil intake port 8 is
Immediate crushing can properly prevent gravel from getting stuck in the intake port and clogging it.

According to the present invention as described above, it is possible to appropriately avoid situations such as gravel getting stuck in the soil intake port of the excavation head and clogging it, thereby allowing the excavation work to be carried out smoothly. effective.

[Brief explanation of the drawing]

FIG. 1 is a side view showing one embodiment of the present invention. Second
The figure is an explanatory view showing the excavation situation by the excavation head of the present invention. In the figure, 1 is the head body, 2 is the connection part, 3 is the excavation bit, 5 is the drum, 6 is the shaft part, 8 is the soil intake port, 10 is the pipe body, (A) is the excavation head of the present invention, ( B) is a buried pipe,
(c) shows each pilot tube. Patent applicant Tokyo Gas Co., Ltd. Nippon Steel Tube Co., Ltd. Koken Drilling Industry Co., Ltd. Inventor Hiroshi Mori - Same
Hajime Eto
Horse Kazu Onma
Sei Kodama 11899-11899
7 (5)

Claims (1)

[Claims] After passing the pilot pipe from the starting shaft to the reaching shaft, it is connected to the tip of the pilot pipe in the reaching shaft, rotated through the pilot pipe, and drawn toward the starting shaft while carrying the buried pipe to the rear, and the hole is expanded. The excavation head for excavating is composed of a cylindrical head body and a tube body connected to the rear part of the head body.The head body is configured to have a smaller diameter than the tube body, and the head body has a - (A drilling bit is provided where the connection part with the pilot tube and a part thereof protrudes outward beyond the outer diameter of the head body, and a drum part eccentric to the axis of the head body is provided at the rear of the head body, The drum part is inserted into the tube body, and the head body and the tube body are rotatably connected coaxially through a shaft provided at the rear of the drum part, and an opening between the drum part and the end of the tube body is formed. An excavation head used in the horizontal long-distance excavation method, which is configured as an earth removal inlet.