JP2001049989A - Propulsion direction correcting device for boring machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily correct the propulsion direction of a jacking pipe during an excavation work. SOLUTION: In a boring machine which comprises a jacking pipe 1 and an inner pipe 2 arranged inside thereof, has a screw auger 11 for excavation rotatably in this inner pipe 2, has an excavation bit 10 on a tip of this screw auger 11, and a plurality of bit expansion parts 10a to be expanded to the outside diameter of the jacking pipe 1 during the rotation for excavation and contracted in diameter during the reverse rotation turnably provided on a circumferential edge part of this excavation bit 10, and excavates the ground while turning this screw auger 11, a plurality of hydraulic pipes 20 to feed the hydraulic pressure from the outside are arranged between the jacking pipe 1 and the inner pipe 2, each hydraulic pipe 20 has a plurality of hydraulic jacks fixed to an inner pipe shoe 9 at the tip of the inner pipe 2, an operation rod 3a of this hydraulic jack 3 is abutted ton a jack receiving base 6 at a rear part of a tip shoe 7 of the jacking pipe 1, and the inclination is given to the tip shoe 7 of the jacking pipe 1 by the action of the hydraulic jack 3 with the inner pipe 2 as the reaction to correct the propulsion direction of the jacking pipe 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion direction correcting device for an excavator in an auger excavation method for burying a propulsion pipe.

[0002]

2. Description of the Related Art When excavating a ground by auger excavation, which is one of the methods for burying a propulsion pipe, a construction method is performed in which a propulsion excavation is performed while rotating a bit having a cutting edge at the tip, and at the same time, the propulsion pipe is press-fitted and buried. Have been In this propulsion method, various methods have been proposed because a method provided with a method of measuring a propulsion direction or a propulsion position and correcting the propulsion direction is advantageous in order to secure construction accuracy. The geological condition of the ground to be excavated in the propulsion direction of the ground is predicted to some extent, and in general, a drill bit having the strength and life required to excavate one hole is prepared and construction is performed. However, when the geological condition exceeded expectations, the drill bit was damaged and needed to be replaced in many cases.In practice, there is a construction method that can replace the drill bit without removing the propulsion pipe during construction. In some cases, it was necessary to abandon equipment such as excavation bits underground or to add a vertical shaft to change the plan according to the geological situation.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems at the same time. The present invention relates to an excavation propulsion machine capable of performing a relatively large-diameter propulsion pipe with high precision over a long distance. A propulsion direction correcting device is provided. Another object of the present invention is to provide a propulsion direction correcting device of an excavation propulsion machine that can easily correct the propulsion direction of a propulsion pipe during excavation work.

[0004]

The present invention has the following configuration to achieve the above object. In a propulsion method in which a propulsion pipe is buried by auger excavation, the propulsion pipe consists of a propulsion pipe and an inner pipe disposed inside the propulsion pipe, and a screw auger for excavation that is rotatably disposed in the inner pipe is disposed. Along with the drilling bit, a plurality of hole-expanding bits that expand to the outer diameter of the propulsion pipe at the time of drilling rotation and reduce the diameter at the time of the reverse rotation are rotatably provided on the periphery of the drilling bit, In an excavation propulsion machine that excavates the ground while rotating an auger, a plurality of hydraulic pipes for supplying hydraulic pressure from the outside are disposed between the propulsion pipe and the inner pipe, and each hydraulic pipe is provided at a tip of the inner pipe. A plurality of hydraulic jacks fixed to the inner pipe shoe are connected, and the operating rod of this hydraulic jack is brought into contact with a jack cradle at the rear of the tip shoe of the propulsion pipe, and the inner pipe is subjected to a reaction force. The propulsion direction of the propulsion pipe is corrected by tilting the tip shoe of the propulsion pipe by operating each of the hydraulic jacks.

In addition, the outer diameter of the hole expanding bit is expanded and contracted, and only the operating rod of the hydraulic jack is brought into contact with the jack cradle at the rear of the tip shoe of the propulsion pipe. Since the fitting is performed by using a flexible seal, the propulsion pipe can be kept underground at the end of the target work or when the drill bit is replaced, so that the drill bit and the hydraulic jack can be withdrawn or re-worked. The above object can be achieved by the configuration of the propulsion direction correcting device of the excavation propulsion machine according to item 1.

The propulsion direction correcting device for an excavation propulsion machine according to the present invention operates a control device provided on the starting pit side to rotate a screw auger disposed in an inner pipe, thereby performing excavation by a drill bit. Starting the hydraulic supply device provided on the starting pit side, adjusting the hydraulic pressure via the hydraulic pipe, operating a plurality of direction correcting jacks provided at the tip to tilt the inclination angle of the tip shoe of the predetermined propulsion pipe Can be adjusted to easily correct the traveling direction of the propulsion tube, screw auger, or the like, and the propulsion can be performed, and the propulsion accuracy can be increased.

When the drill bit needs to be replaced during the construction, the screw auger is reversed to reduce the diameter of the hole of the drill bit so that the entire bit is smaller than the diameter of the propulsion pipe. The drill bit can be stored in the pit, and the drill bit can be easily collected together with the inner pipe on the starting pit side.

In the propulsion direction correcting device for an excavating propulsion machine according to the present invention, the tip shoe of the propulsion pipe can be easily operated by the jack for correcting the direction, and the flexible shoe is provided between the tip shoe and the inner pipe shoe. Since the contact seal is disposed, the tip shoe can be easily bent, and there is no danger that sand or the like may enter the inner tube even by swinging, so that no trouble is caused.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an apparatus for correcting a propulsion direction of an excavator according to the present invention. FIG. 1 is a schematic explanatory view showing an embodiment of a propulsion direction correcting device according to the present invention. FIG. 2 is a side view of a starting shaft illustrating a drive unit of an excavation propulsion machine having the propulsion direction correcting device of FIG. FIG. 3 is a front view of an embodiment of a drill bit used in the present invention. FIG. 4 is a sectional view taken along line AA of FIG. FIG. 5 is a sectional view taken along line BB of FIG.

Referring to FIG. 1, a screw auger 11 having a drill bit 10 is rotatably loosely fitted into an inner tube 2. A propulsion pipe 1 is disposed outside the inner pipe 2, and a hydraulic pipe 20 for supplying hydraulic pressure from the starting pit side is provided in a gap between the inner pipe 2 and the propulsion pipe 1. Along the circumferential direction, jacks 3, 3,... The operating rod 3a of each direction correcting jack 3 is in contact with a jack receiving base 6 of a tip shoe 7 pivotally supported at the tip of the propulsion pipe 1.
The specific direction correcting jack 3 is operated to operate the operating rod 3a.
The tip shoe 7 is inclined by the above operation, and the inner pipe shoe 9 is fitted inside the tip shoe 7 with the contact seal 19 interposed therebetween.

In order to monitor the position of the drill bit 10 of the screw auger 11, a target 18 having a built-in LED light emitter is embedded. The drill bit 10 is provided with a number of cutting edges for drilling radially, and a plurality of bit expanding portions 10a having a hole expanding bit that rotates and expands when rotating in the peripheral direction around the peripheral portion. When rotating in the direction opposite to the digging direction, the bit expanding portion 10a
It rotates in the direction to reduce the diameter of 0. Screw auger 1
1, the inner pipe 2 and the propulsion pipe 1 have a base 13 on the starting pit side.
The inner tube 2 and the like are supported at the rear end thereof by an adapter 14 and connected to a rotating unit 16. The rotating unit 16 is linked to the auger driving motor 15.
A transit 17 for observing the target 18 and collimating the propulsion direction of the propulsion hole is disposed at the rear end of the rotating portion 16.

The operation of the device for correcting the direction of propulsion of the excavator constructed as described above will be described. The inner pipe 2 is inserted into the propulsion pipe 1 having a predetermined length, and the jack 3 for direction correction is mounted on the jack mounting base 8. At this time, the propulsion direction of the tip shoe 7 of the propulsion pipe 1 is accurately determined and attached. Next, the screw auger 11 is inserted into the inner pipe 2, and the drill bit 10 is attached to the tip. The propulsion device (not shown) mounted on the base 13 is operated to bring the excavation surface of the excavation bit 10 attached to the screw auger 11 into contact with the surface of the ground at the excavation site.

When the auger driving motor 15 is operated, the screw auger 1 is
1 rotates counterclockwise in FIG. 3 and the drill bit 10 rotates to start drilling. Casters 12 are arranged between the propulsion pipe 1 and the inner pipe 2 so that the distance between them is kept constant.
The inner tubes 2 are arranged substantially concentrically so that the inner tube 2 can be smoothly inserted into the propulsion tube 1.

With the rotation of the screw auger 11, the excavating bit 10 excavates the ground in front of the propulsion pipe 1 in a state where the bit enlarging portion 10a is enlarged. The blade extrudes to the rear propulsion machine, and a propulsion force for overcoming the frictional resistance of the ground is given to the excavated space by the propulsion pipe 1 from a propulsion machine (not shown), and the propulsion pipe 1 is propelled underground. In this propulsion direction, excavation propulsion is performed while the target 18 is constantly monitored by the transit 17. When the hole is bent, the direction of the correction is determined, the hydraulic pressure is supplied through the hydraulic pipe 20 to the direction correcting jack 3 located on the opposite side of the direction, and the direction correcting jack 3 is operated to be propelled by the operating rod 3a. Excavation can be promoted while adjusting the inclination of the tip shoe 7 through the jack cradle 6 at the rear of the tip shoe 7 which controls the progress of the pipe 1 and the direction correction.

At the time of this propulsion, the tip shoe 7 and the inner pipe shoe 9
Because the contact seal 19 is interposed between the propulsion pipe 1 and the inner pipe 2 during the propulsion.
The connecting portion between the propulsion pipe 1 and the tip shoe 7 has a sealing member 1
Since the seal protection ring 5 is interposed and interposed around the seal protection ring 5, the tip shoe 7 can be operated without any trouble.

The propulsion of the excavating propulsion device of the present invention is carried out while monitoring the accuracy of the propulsion direction while correcting the direction when necessary. When the propulsion device on the base 13 completes the propulsion of the moving stroke, the auger drive is performed. The prime mover 15 and the propulsion unit (not shown) release the connection of the adapter 14 and the rotating unit 16 to the front, and move rearward on the base 13. New propulsion pipe 1, inner pipe 2, screw auger 11, and hydraulic pipe 2
0 is supplied, first connected to the same thing in the front, and then the propulsion is performed again after being connected to the propulsion device by the adapter 14 and the rotating unit 16. The cycle of adding and propelling new tubing is repeated until a predetermined depth is reached.

When the geological condition of the ground to be propelled by the excavator of the present invention is not in a predicted state and it is necessary to replace the excavating bit 10, the bit expanding portion 10 a is moved through the screw auger 11 and the rotating portion 16. Due to the reverse rotation of the auger driving motor 15, the diameter is reduced to be smaller than the minimum inner diameter of the tip shoe 7, and the inner pipe shoe 9, the contact seal 19, the direction correcting jack 3, leaving the propulsion tube 1, the tip shoe 7, and the seal protection ring 5, The jack mount 8, the inner pipe 2, and the hydraulic pipe 20 can be pulled out together with the screw auger 11 and the drill bit 10 to the starting shaft side, and the drill bit 10 can be replaced and inserted again into the propulsion pipe 1 to return to the drilling position. . After the propulsion work is completed, the propulsion pipe and tip
And all the instruments except the seal protection ring 5 can be recovered to the starting shaft side.

[0018]

According to the propulsion direction correcting device of the present invention, the jack for correcting the direction of inclination of the shoe attached to the tip of the propulsion pipe is arranged in the propulsion pipe. Can be corrected, and high construction accuracy can be maintained. Also,
If necessary, the equipment can be withdrawn and the drill bit can be replaced without having to withdraw the outer pipe, so long-distance propulsion on hard ground where drill bit wear is expected can be achieved.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing an embodiment of a propulsion direction correcting device of an excavation propulsion machine according to the present invention.

FIG. 2 is a side view of a starting shaft illustrating a driving unit of an excavation propulsion machine having the propulsion direction correcting device of FIG.

FIG. 3 is a front view of an embodiment of a drill bit used in the present invention.

FIG. 4 is a sectional view taken along line AA of FIG. 1;

FIG. 5 is a sectional view taken along line BB of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Propulsion pipe 2 Inner pipe 3 Jack for direction correction 3a Operating rod 4 Seal 5 Seal protection ring 6 Jack pedestal 7 Tip shoe 8 Jack mounting base 9 Inner pipe shoe 10 Drilling bit 10a Bit expanding part 11 Screw auger 12 Caster 13 Base 14 Adapter 15 Auger drive motor 16 Rotating part 17 Transit 18 Target 19 Contact seal 20 Hydraulic pipe

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Yasushi Hayashi In Taisei Construction Co., Ltd. 1-25-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo (72) Katsuaki Nagano 633 Nakagami, Kamizukikuma, Hakata-ku, Fukuoka, Fukuoka Inside Toho Underground Machine Co., Ltd.

Claims (2)

[Claims] In a propulsion method in which a propulsion pipe is buried by auger excavation, a propulsion pipe and an inner pipe disposed inside the propulsion pipe are provided, and a screw auger for excavation rotatably disposed in the inner pipe is disposed. A drill bit is provided at the tip of the screw auger, and a plurality of drill bits are rotatably provided on the periphery of the drill bit, which extend to the outer diameter of the propulsion pipe during drilling rotation and reduce the diameter during reverse rotation. In a drilling propulsion machine that excavates the ground while rotating the screw auger, a plurality of hydraulic pipes for supplying hydraulic pressure from outside are arranged between the propulsion pipe and the inner pipe, and each hydraulic pipe is A plurality of hydraulic jacks fixed to the inner pipe shoe at the tip of the inner pipe are connected, and the operating rod of the hydraulic jack is brought into contact with a jack cradle at the rear of the tip shoe of the propulsion pipe, A propulsion direction correcting device for an excavating propulsion machine, wherein the propulsion direction of the propulsion pipe is corrected by tilting the tip shoe of the propulsion pipe by operating each of the hydraulic jacks using the inner pipe as a reaction force. 2. The expansion and contraction of the outer diameter of the hole-expanding bit and the operation rod of the hydraulic jack only contact the jack cradle at the rear of the tip shoe of the propulsion tube. Since it was fitted with a flexible seal,
2. The drilling bit and the hydraulic jack can be withdrawn or re-operated while the propulsion pipe is kept underground at the time of completion of the construction or replacement of the drilling bit.
A propulsion direction correcting device for an excavation propulsion machine according to item 1.