JP3161691B2 - Underground buried body drilling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention crushes obstacles such as rocks appearing at a cutting face ground to shorten the work period and work cost of drilling work for a leading hole, and to make the leading hole the same cross section as a buried body. The present invention relates to an underground buried body leading hole digging apparatus capable of digging to facilitate and stabilize the propulsion of a buried body.

[0002]

2. Description of the Related Art Conventionally, when underground structures such as waterways and underpasses are constructed underground, for example, Japanese Patent Publication No. 55-5055
In Japanese Patent Publication No. 7, an excavation pipe is attached to the tip of an underground buried object,
A screw auger is arranged inside the underground buried object and the excavation pipe, and a cutter is rotatably provided at the tip of the auger,
The excavation pipe penetrates into the ground from the starting shaft, excavates in front of the excavation pipe while propelling an underground object, and discharges the excavated earth and sand from the auger.

[0003] However, in the conventional drilling device, when an obstacle such as a rock appears on the ground, the propulsion of the underground buried object is interrupted, and the construction is forced to be interrupted. Further, there is no appropriate countermeasure. However, a method of excavating rocks from the upper part of the ground is usually employed, and there is a problem that the construction period is prolonged and the construction cost is increased.

Further, the above-mentioned apparatus uses a tubular excavation pipe corresponding to a columnar underground object, but it is difficult for a columnar underground object to stop water from adjoining underground objects. When used as a main body structure, there is a problem that the concrete concrete needs to be poured in and the number of steps increases accordingly. Therefore, when an underground buried object with a rectangular cross section and a digging pipe are used instead of a tubular digging pipe, the excavation residue is generated at the four corners of the digging pipe and resistance during propulsion increases, and the Propulsion requires a great deal of power and can cause ground deformation.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves such a problem and crushes obstacles such as rocks appearing at the cutting face ground, thereby shortening the construction period of the leading hole excavation work and reducing the construction cost. It is another object of the present invention to provide a drilling device for an underground buried body in which a leading hole is excavated to have the same cross-section as that of the buried body so as to facilitate and stabilize the propulsion of the buried body.

[0006]

SUMMARY OF THE INVENTION claims 1 invention, the lead pipe provided at the distal end portion of the propulsion tube, provided the main cutter rotation available-the front of the tip conduit, to the rear of the main cutter the auxiliary cutter on the inner surface of the main cutter and the work One said destination conduit
And the projecting end of the auxiliary cutter
In a leading hole excavation device for an underground buried body capable of engaging with an inner surface of a leading conduit, a tip portion of the auxiliary cutter is formed in a hemispherical shape.
And forming the supplementary pipes at the four corners of the inner surface of the front pipe.
Provide a guide plate that can be engaged with the protruding end of the auxiliary cutter.
Move the auxiliary cutter smoothly to the inner surface of
-Excavation residue at the four inner corners of the pipe
Promotion and stabilization. According to a second aspect of the present invention, a protrusion of an auxiliary cutter is provided inside the guide plate.
Form an arcuate curved surface that can be engaged with the protruding end, and
To facilitate the movement of the inner surface of the
I have.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 to 6, reference numeral 1 denotes a rectangular cross-section propulsion pipe which is an underground buried body. Is detachably mounted, and the tip of the tube 2 is formed in a hood shape. For example, one end of a towing cable (not shown) can be attached to the tip of the forward conduit 2 as a means for moving the propulsion pipe 1, and the other end is connected to a towing jack installed on the reaching shaft (not shown). Making it possible.

An auger tube 3 is mounted inside the leading conduit 2, and a conical guide 4 is provided at the tip of the auger tube 3, and a plurality of crushing projections 5 protrude from the peripheral surface of the guide 4.
A screw auger 6 is rotatably provided inside the auger tube 3, and its drive shaft 7 is connected to a drive device 8 such as a hydraulic motor.
The excavated earth and sand is conveyed to the inside of the auger pipe 3 and can be carried out to the starting shaft via a vacuum suction device (not shown) provided on the downstream side.

Jacks 9, 9 are arranged inside the front conduit 2, and the base ends of the jacks 9, 9 are fixed to a fixed position on the starting shaft side, and the piston rods 10, 9 are attached to the distal ends thereof.
10 is attached so as to be able to expand and contract. Piston rod 1
The distal ends of 0 and 10 are connected to a driving device 8 so that the screw auger 6 and the driving shaft 7 can be moved in the tube axis direction of the front conduit 2 via the driving device 8 when the jacks 9 and 9 expand and contract. I have.

The operation of the jack 9 is remotely controlled on the starting shaft or the reaching shaft side, and is controlled based on information such as the amount of earth removed by each measuring instrument installed at a predetermined position, the number of rotations of the drive shaft 7, or the hydraulic data of the drive device 8. Based on the result, the worker
The presence / absence of an obstacle 12 such as a rock or the like is determined, and when the appearance of the obstacle 12 is determined, the jack 9 is made expandable and contractable according to the information.

The jack 9 always contracts the piston rod 10 to enable excavation by the main cutter described later.
When the obstacle 12 appears, the piston rod 10 is extended, and a cutter head, which will be described later, protrudes forward of the front pipe 2 so that the obstacle 12 can be guided inside the front pipe 2.

A substantially shaft-shaped cutter head 13 is attached to the tip of the drive shaft 7, and the cutter head 13 is always attached to the leading pipe 2.
And a main cutter 15 having a plurality of cutter bits 14 projecting from the front end face of the chevron. A pair of auxiliary cutters 16 are accommodated inside the cutter head 13 so as to be oil-tight and slidable in the axial direction.
A cutter jack (not shown) is arranged between 6, 6.

The cutter jack is capable of supplying and discharging pressure oil from a hydraulic power unit (not shown) provided on the starting shaft or the reaching shaft, and urges the pair of auxiliary cutters 16 outward when the pressure oil is supplied. In addition, it is slidable at a constant displacement, and its semi-spherical tip can be engaged along the inner surface of the front conduit 2.

On the other hand, at the time of discharging the pressurized oil, that is, at the time of returning the oil, a negative pressure is generated in the hydraulic jack to move the pair of auxiliary cutters 16 inward.
3 can be drawn inside. In the figure, reference numeral 17 denotes a guide plate attached to each of the four corners of the leading conduit 2, and has an arcuate curved surface 17 a which can be engaged with the tip of the auxiliary cutter 16.

A substantially conical ring-shaped crushing frame 18 is provided on the back surface of the cutter head 13 so as to face the guide 4, and a plurality of crushing projections 19 are provided on the peripheral surface thereof. A movement path for excavated sediment can be formed between the crushing projection 19 and the crushing projection 5.
Is rotatably supported.

When excavating the ground 11 using the leading hole excavator constructed as described above, the propulsion pipe 1 is carried into the starting shaft, the leading pipe 2 is attached to the tip of the pipe 1, and the pipe 1 is attached. A screw auger 6 is assembled in the inside, and a driving device 8 is attached to the base end of the driving shaft 7, and piston rods 10, 10 of jacks 9, 9 are attached to the rear of the device 8. Also,
The cutter head 13 is attached to the tip of the drive shaft 7, the head 13 is arranged inside the front pipe 2, and the crushing frame 18 at the back thereof is arranged to face the guide 4 of the auger tube 3.

Then, with the leading conduit 2 facing the reaching shaft,
The propulsion tube 1 is positioned at a predetermined position of the starting shaft, and the base end of the jack 9 is fixedly fixed at a predetermined position on the starting shaft side. In addition, a tow cable (not shown) is attached to the tip of the leading conduit 2, the cable (not shown) is inserted into a cable insertion hole (not shown) excavated in advance, and a tow jack (shown in the drawing) installed on the reaching shaft side is provided. (Abbreviated).

After that, the towing jack is operated to pull the leading pipe 2 and the propulsion pipe 1 to the reaching shaft side via the towing cable, and the driving device 8 is driven to rotate the driving shaft 7 so that the shaft is rotated. 7 and the screw auger 6 are rotated. In this way, the main cutter 15
Cooperates with the cutter head 13 to excavate the face face mountain, the excavated earth and sand is guided between the crushing frame 18 and the guide 4, and a certain amount of the excavated soil is sent into the front pipe 2.

Thereafter, the excavated earth and sand is conveyed to the screw auger 6, sucked by a vacuum suction device (not shown), and carried out of the starting shaft. Therefore, the leading pipe 2 and the propulsion pipe 1 move to the reaching shaft side by the excavation of the ground.

During this time, the jacks 9 and 9 are contracted, and the excavated earth and sand moving between the guide 4 and the crushing frame 18 comes into contact with the crushing projections 5 and 19, and their lumps are broken down. Liquidity is encouraged. Also, the cutter head 13
Pressure oil is fed into the cutter jack (not shown) inside the
The auxiliary cutters 16, 16 are urged outward by the hydraulic pressure, and their tips project outside the cutter head 13.

For this reason, the auxiliary cutters 16 and 16 are rotated together with the cutter head 13 to rotate inside the front conduit 2 while maintaining the above-mentioned protruding state, so that the inner surfaces thereof and the guide plate 1 are rotated.
7 slides inside. At this time, the auxiliary cutters 16, 16
At the opposite side of the front pipe 2, it slides slightly inwardly and slides, and at the diagonal position, expands and engages with the concave curved portion 17 a of the guide plate 17 to rotate the entire inner surface of the front pipe 2.

This situation is as shown in FIG. 3, in which a rotation trajectory of the main cutter 15 is formed inside the front conduit 2 as shown by an imaginary line, and the path between the trajectory and the inner surface of the front conduit 2 and the guide plate 17 is formed. The auxiliary cutters 16, 16 excavate the ground 11, and the remaining excavation by the main cutter 15 is removed. Therefore, the leading hole of the leading pipe 2 or the propulsion pipe 1 formed by the main cutter 15 and the auxiliary cutters 16 and 16 is excavated to have substantially the same shape as the cross-sectional shape of the leading pipe 2 or the propulsion pipe 1. There is reduced, a lead tube 2 and the propulsion tube 1 is moved smoothly and stably.

Under these circumstances, as shown in FIG. 4, when an obstacle 12 such as a rock appears at the mountain face, as shown in FIG. 4, the amount of soil removed is reduced, and the amount of propulsion of the leading conduit 2 or the propulsion pipe 1 is reduced. At the same time, the rotation speed and hydraulic pressure of the drive device 8 increase. These conditions are detected by a measuring instrument provided on the starting shaft or the arrival shaft, and based on the data, the operator extends the jacks 9, 9 and forcibly pressurizes the hydraulic oil of the cutter jack in the cutter head 13. Return to the oil tank.

By doing so, the piston rod 10,
When the drive shaft 10 extends, the drive shaft 7 moves to the cutting face ground 11 side together with the drive device 8 and the cutter head 13 and the like, and the cutter jack (not shown) becomes a negative pressure, so that the auxiliary cutters 16 and 16 are moved. It is pulled inside the cutter head 13.
For this reason, the cutter head 13 protrudes forward of the front conduit 2, and the main cutter 15 excavates the support base of the obstacle 12, weakens or disappears the base, and promotes the movement of the obstacle 12.

As a result, the obstacle 12 is guided by the main cutter 15 or moves to the outer end of the cutter head 13 by its own weight, and is guided to the back of the head 13, and the crushing frame 1 is moved.
8 and the guide 4. This situation is as shown in FIG. In this case, since the auxiliary cutters 16 and 16 are drawn into the end of the cutter head 13 as described above, they do not hinder the movement of the obstacle 12.

Thereafter, the operator reduces the jacks 9, 9 as appropriate, moves the cutter head 13 backward, and moves the crushing frame 1
The obstacle 12 is sandwiched between the guide 8 and the guide 4. In this way, one side of the obstacle 12 is cut and crushed by the crushing projection 19 while rotating, and the other side is cut and crushed by the crushing projection 5 while stationary, and as shown in FIG. The crushed pieces are conveyed by the screw auger 6 and carried out to the starting shaft via the vacuum suction device.

The crushing operation is carried out for a required time based on the amount of soil removed, the amount of propulsion of the propulsion pipe 1 and the condition of the crushed pieces, or by appropriately extending the jacks 9, 9 again. When the normal excavation condition is restored, the crushing operation is terminated, and the jacks 9, 9 are contracted to resume the original excavation work.

As described above, according to the present invention, even if the obstacle 12 appears on the face mountain 11, it can be crushed and the earth 11 can be excavated. Compared with the method of excavation, the interruption of excavation work is shorter, so that the construction period can be shortened and the construction cost can be reduced.

When the leading pipe 2 has reached the reaching shaft, the towing cable and the leading pipe 2 are removed, the screw auger 6 and the drive unit 8 are removed from the pipe 2, and the jacks 9, 9 are removed. By the way, the installation of the propulsion pipe 1 is completed. Thereafter, components such as the auger screw 6 are assembled to another propulsion pipe 1, and this is positioned at a predetermined position on the starting shaft, tow and propell.

[0030]

The invention of claim 1 as described above according to the present invention, the auxiliary mosquito
The tip of the
At four corners of the inner surface of the conduit, the projecting ends of the auxiliary cutters are engaged.
A guide plate is provided so that the auxiliary cutter can be
And move it smoothly to the inner surface of the
Removal of the excavation residue at the four corners of the
Stabilization can be achieved. The invention according to claim 2 is characterized in that the gas
Can be engaged with the protruding end of the auxiliary cutter inside the guide plate
Since the arc-shaped curved surface is formed, the leading pipe of the auxiliary cutter
The smooth movement of the inner surface can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a main part of FIG.

FIG. 3 is a left side view of FIG. 2;

FIG. 4 is a cross-sectional view showing a state of excavation of a leading hole according to the present invention, in which rock appears on a mountain face;

FIG. 5 is a cross-sectional view showing a state before the rock is crushed according to the present invention, and shows a state where the rock is introduced into the front conduit.

FIG. 6 is a cross-sectional view showing a state after crushing of a rock according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Propulsion pipe (buried body) 2 Lead pipe 3 Auger pipe 4 Guidance guide 5, 19 Crushing projection 6 Screw auger 7 Drive shaft 15 Main cutter 16 Auxiliary cutter 17 Guide plate 18 Crush frame

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshio Hayashi 2-3-5 Misakicho, Chiyoda-ku, Tokyo Iron Construction Construction Co., Ltd. (72) Inventor Masaharu Saito 2 Misakicho, Chiyoda-ku, Tokyo No. 5-3, Iron Construction Construction Co., Ltd. (72) Inventor Yoshitaka Komuro 2-53-3, Misakicho, Chiyoda-ku, Tokyo Iron Construction Construction Co., Ltd. (56) References JP-A-60- 192091 (JP, A) JP-A-7-269290 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 9/06 311 E21D 9/08

Claims (2)

(57) [Claims] 1. A the lead pipe provided at the distal end portion of the propulsion tube, the front portion of the distal conduit is provided mainly cutter rotation available-to rear of the main cutter, moving the auxiliary cutter same and the main cutter Before
The auxiliary bracket is provided so as to project toward the inner surface of the
In the underground buried body leading hole excavating device in which the projecting end of the cutter is engageable with the inner surface of the leading conduit, the tip of the auxiliary cutter is
The end portion is formed in a hemispherical shape, and the inner surface of the front conduit is formed.
At the four corners of the auxiliary cutter,
A leading hole excavation device for an underground buried body characterized by providing an id plate . 2. An auxiliary cutter protruding inside the guide plate.
2. An arcuate curved surface which can be engaged with the projection end.
A digging device for a leading hole of an underground buried body as described in the above.