JPS621350Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pipe burying device for inserting and burying gas pipes, water pipes, water and sewage pipes, etc., or steel pipes, etc., into gravel ground while excavating horizontal holes.

Recently, horizontal augers have been increasingly used for burying pipes, and as a result, the range of use for burying pipes has expanded from not only normal ground to water-bearing sand, soft rock, and gravel ground. There is.

However, when drilling into a water-retaining sand layer, if underground spring water is discharged through the buried pipe when drilling is interrupted or stopped, the unexcavated ground in front of the buried pipe may settle.
Problems such as collapse may occur.

In addition, when excavating in gravel ground where gravel such as boulders of 50 mm or more is present, it is not possible to crush the gravel with a normal excavation blade, and it is also impossible to transport and discharge it with an auger screw. Therefore, it is extremely difficult to bury the pipe in the ground where such large gravel exists, and in many cases it is virtually impossible to bury the pipe.

In view of this, it is an object of the present invention to provide a pipe burying device that can be easily excavated and propelled and inserted not only in underground water-retaining sand layers and soft rock layers, but also in gravel ground where large gravel exists and underground spring water exists. It was made for the purpose of

In order to achieve the above object, the gravel ground pipe burying device according to the present invention is provided with a leading pipe at the tip of the buried pipe, a cutter ring at the tip of the leading pipe, and an auger screw inserted into the buried pipe. , a pipe burying device for burying a pipe by driving the auger screw rotationally to excavate the ground at the tip of the pipe and pressing the pipe from behind; , a water stop plate fixed to the tip of the auger screw so as to close the tip of the casing, and an inner periphery of the cutting edge ring fixed to the front end at a required distance from the water stop plate. It has a disk-shaped substrate placed close to the surface, and on the outer surface of this substrate, a plurality of conical crushing blades having a large number of protruding blades protruding from the outer peripheral surface are arranged in an annular shape so as to be freely rotatable. A crushed gravel inlet consisting of a cutout or the like is formed on the outer periphery of the substrate, and a water jet is provided in the center of the substrate that communicates with the water supply channel in the shaft of the auger screw to eject water. The water stop plate has a mouth, and the water stop plate is characterized in that the tip of the casing can be opened and closed in order to adjust the inflow of groundwater or earth and sand by moving the auger screw forward and backward.

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

The propulsion drive unit 1 of the pipe burying device is generally known, and an example thereof is shown in FIG.
It is composed of a driving device 3 for the auger screw 2 and a pressing cylinder 5 for the buried pipe 4.
is connected to the rear end of the buried pipe 4 via a screw advance/retreat adjusting cylinder 6.

The propulsion drive unit 1 is installed movably along a frame 7, and when a predetermined length of auger screw 2 and buried pipe 4 reach a predetermined depth, a new auger screw and a new buried pipe 4 are added. The pipe will be buried by digging and inserting it again.

A cylindrical casing 8 is provided inside the buried pipe 4.
is inserted into the casing 8, and the auger screw 2 is passed through the casing 8 so as to be freely retractable. Further, at the tip of the buried pipe 4, a leading pipe 9 is shown as shown in FIG.
are connected in series, and a cutting edge ring 1 is attached to the front end of this leading pipe 9.
0 are joined via seal members 11, 11, and the annular wall 12 fixedly installed on the rear inner periphery of the cutting edge ring 10 and the leading pipe 9 are connected to each other.
The blade ring 10 is connected by a plurality of direction correction cylinders 13 installed therein, and the direction of the cutting edge ring 10 can be corrected by remotely controlling the supply and discharge of pressure oil to the cylinders 13.

A water stop plate 14 is fixed to the tip of the auger screw 2 and can be fitted as tightly as possible into the tip of the casing 8. A disk-shaped substrate 15 is fixed thereto.

The outer periphery of this substrate 15 has an outer diameter close to the inner peripheral surface of the cutting edge ring 10, and the back surface of this substrate 15, the inner peripheral surface of the cutting edge ring 10, and the annular wall 12
A crushed gravel introduction chamber 16 is thus formed.

On the front side of the substrate 15, a plurality of crushing blades 18, 18 (commonly known as tricombi bits) each having a truncated conical shape and having a large number of protruding blades 17 protruding from the circumferential surface are mounted by bearings 19, 19... Supported for free rotation. In the illustrated embodiment, six crushing blades 18, 18, . Three crushing blades 18, 18,
18 are arranged annularly at equal intervals in the same relationship as above. The number and arrangement of the crushing blades 18 can be appropriately selected depending on the diameter of the substrate 15 and the properties of the excavated ground.

In the outer and outer periphery of the base plate 15, a crushed bladder in which is located between the crushed blade 18,18…, a crushing derivation of a crushed hole 20, 20, 2, 2.
0' and 20' are formed. Further, the substrate 15
a water injection port 21 located between the crushing blades 18, 18, 18 disposed inside the auger screw 2 and communicating with a water supply passage provided inside the shaft 2a of the auger screw 2;
21, 21 are opened and water is spouted forward. The rear end of the water supply path is communicated with a swivel installed in a drive section (not shown).

In addition, the water stop plate 14 is designed to fit inside the tip of the casing 8 to close it off, and is also formed to have a larger diameter than the casing 8 so that it comes into contact with the tip surface of the casing 8. It may also be closed by touching.

Next, the operation of the above embodiment will be explained.

To excavate gravel ground, use Auger Screw 2.
When the is rotated, the base plate 15 integrated with the base plate 15 is rotated, and a large number of crushing blades 1 disposed on the front surface of the base plate 15 are rotated.
8, 18, ... revolve around the central axis while rotating due to friction with the ground. Gravel such as boulders existing in the ground enters between the crushing blades 18, 18, . . . and is finely crushed by the protruding blades 17 of the crushing blades 18, 18, .

The crushed gravel that has been crushed into smaller pieces is crushed by the crushing blade 1.
8, 18, . . . and gradually pushed toward the outer periphery of the substrate 15.
The crushed gravel is then fed into the crushed gravel introduction chamber 16 on the back side of the substrate 15. The crushed gravel that entered this introduction chamber 16 is
The water enters the casing 8 between the water stop plate 14 and the leading edge of the casing 8, is sent rearward by the screw blade 2b, and is discharged to the ground.

In this case, the efficiency of excavating and carrying out earth and sand can be improved by spouting water from the water injection ports 21, 21, 21 opened at the center of the outer surface of the substrate 15 while crushing the gravel. In addition, when there is a lot of underground spring water when drilling is interrupted or stopped, water flows into the casing 8 by retracting the auger screw 2 and drawing the water stop plate 14 at its tip into the tip of the casing 8. This can prevent subsidence and collapse of unexcavated ground due to groundwater outflow.

As described above, in the present invention, a plurality of conical crushing blades each having a large number of protruding blades protruding from the outer circumferential surface are arranged in an annular manner so as to be freely rotatable on the front surface of the substrate fixed to the tip of the auger screw. By rotating the auger screw, even if there is large gravel in the ground, it can be crushed into small pieces, and the excavated soil containing the crushed gravel is introduced into the back of the crushed gravel inlet formed in the base plate. Since the debris is transported to the rear using the screw blade of the auger screw, large debris is not taken in as it is.
Therefore, there is no possibility of the screw blade getting caught between the screw blade and the casing, or clogging within the casing. In addition, a water injection port is provided on the front of the board, and excavation can be performed while jetting water from this injection port, which gives fluidity to the excavated soil and increases the transport efficiency.Furthermore, the tip of the auger screw A water stop plate that can open and close the opening at the tip of the casing is installed at the bottom of the casing, and the casing can be closed by moving the auger screw forward and backward.This water stop plate makes it possible to close the casing when excavating ground with a lot of groundwater, such as ground with spring water. This has various effects, such as preventing subsidence and collapse of unexcavated ground.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the main part, and FIG. 3 is a front view of the same. DESCRIPTION OF SYMBOLS 1... Propulsion drive part, 2... Auger screw, 4... Buried pipe, 8... Casing, 9... Leading pipe, 10... Cutting edge ring, 14... Water stop plate, 1
5...Substrate, 17...Protrusion blade, 18...Crushing blade,
20...Crushed gravel introduction port, 21...Water injection port.

Claims (1)

[Claims for Utility Model Registration] A guide pipe is provided at the tip of the buried pipe, a cutting edge ring is provided at the tip of the guide pipe, and an auger screw is inserted into the buried pipe, and the auger screw is rotationally driven. A pipe burying device that presses and propels the pipe from behind while excavating the ground at the end of the pipe includes a casing that is inserted into the buried pipe and the leading pipe and through which the auger screw is inserted, and a distal end of the casing that is closed. a water stop plate fixed to the tip of the auger screw, and a disc-shaped disk fixed to the front end at a required distance from the water stop plate and placed close to the inner circumferential surface of the cutting edge ring. A plurality of conical crushing blades each having a plurality of protruding blades protruding from the outer circumferential surface are arranged in an annular manner so as to freely rotate on the outer surface of the substrate. Forms an inlet for crushed gravel consisting of a notch, etc., and also has a water injection port in the center of the substrate that communicates with the water supply channel in the shaft of the auger screw and spouts water. A pipe burying device for gravel ground, characterized in that the water plate can open and close the tip of the casing by moving the auger screw forward and backward.