JPH0849494A - Drilling device of underground hole and drilling method - Google Patents

Abstract

PURPOSE:To straightly drill underground by installing a horizontal inner tube with a cutter part on its tip part, an irrotational outer tube to insert this inner tube into it and a target between them, additionally furnishing an observation apparatus and observing the target from outside of both of the inner tube and the outer tube. CONSTITUTION:A first inner tube 11 is inserted into a first outer tube 12, and the rear end part of the inner tube 11 is positioned horizontally by chucking it with a chuck part 8. The underground is drilled by a blade part 15 by advancing a main body part 5 to the right on a base 3 by way of driving a hydraulic device while slowly rotating the inner tube 11 around its shaft center as its center. At this time, lubricant from a lubricant feeder 18 is fed in the circumference of the blade part 15 from a pipe 17. Additionally, a rectilineal advancing property of the inner tube 11 and the outer tube 12 is monitored by observing a target 23 by a transit 6 by way of putting on a light source 21, and when it is out of order, its direction is corrected. Thereafter, when the first inner tube 11 and the outer tube 12 thoroughly advance underground, drilling is forwarded by connecting the head end parts of the second inner tube 11 and outer tube 12 to the rear end parts of the first inner tube 11 and outer 12. When they reach a target pit 2B at the terminal, removal work of the inner tube 11 is carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground hole excavating apparatus and an excavating method for excavating an underground hole such as a sewer hole or a cable hole.

[0002]

2. Description of the Related Art Conventionally, various types of excavating devices for excavating underground holes such as sewer holes and cable holes are known, but in any of these methods, a blade portion is rotated by power means.・ It is designed to excavate underground while moving forward.

[0003]

The excavation device for an underground hole of this type requires not only a few troubles during excavation work but also a straightness of excavation. The most common problem with this type of drilling rig is that it encounters gravel and boulders that exceed its capabilities, and it becomes impossible to proceed. Therefore, conventionally, a boring method in which a hollow tube having a blade at its tip is rotated to excavate has been used as a method capable of coping with any gravel and cobblestone layer. However, there is no conventional boring method that can accurately measure the position of the tip, and there is a defect in the straightness of excavation, and it is used only in situations where short distances are sufficient when other propulsion methods cannot be used. Didn't. Therefore, the present invention is a boring system, and by providing a means for accurately measuring the position of the tip, it is possible to realize straightness of excavation with less trouble, and to perform excavation easily and at high speed over long distances. An object of the present invention is to provide a drilling device and a drilling method for a borehole.

[0004]

To this end, the present invention provides a main body portion, a horizontal inner tube to which a forward force and a rotational force are applied from the main body portion, and a blade portion is provided at a tip end portion thereof. Excavation of an underground hole from a non-rotating outer pipe into which a pipe is inserted, a target provided between the inner pipe and the outer pipe, and an observer for observing the target from outside the inner pipe and the outer pipe. The device is configured. Further, a synovial fluid feeding pipe for ejecting synovial fluid is provided around the blade portion between the inner tube and the outer tube. Further, the method of excavating the underground hole of the present invention directs the inner tube inserted into the non-rotating outer tube from the starting pit to the target pit in a horizontal posture in the ground by the forward force and the rotating force applied from the main body. While excavating the inner pipe with the blade provided at the tip of this inner pipe, and when the underground excavation is completed, remove the blade from the inner pipe, and then remove the inner pipe from the main body. By the forward or backward force, the outer pipe is taken out to the starting pit or the target pit, and the earth and sand clogged inside the taken out inner pipe is removed.

[0005]

According to the excavating device having the above-mentioned structure, it is possible to excavate straight into the ground while observing the target with the observer. Further, by discharging the synovial fluid around the blade portion, the rotational resistance and the propulsion resistance of the blade portion are reduced, the generation of frictional heat is suppressed, and high-speed and long-distance drilling can be performed. Further, according to the excavation method having the above-mentioned configuration, when the excavation is completed, the inner pipe is taken out from the outer pipe to the starting pit or the target pit, so that the outer pipe remains in the ground to form the underground hole.

[0006]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is an overall side view of an excavation device for an underground hole. Reference numeral 1 is the ground, which is a starting pit 2A and a destination pit 2B for construction.
Has been drilled. Departure pit 2A is the starting point of excavation, destination pit 2
B is the end point. A base 3 of the propulsion device is installed at the departure pit 2A. A body portion 5 of the excavator is installed on the base 3. The main body 5 is moved forward and backward on the base 3 by the operation of a hydraulic device (not shown) on the side thereof. At the rear of the base 3, a transit 6 is provided as an observer. The transit 6 observes a target (described later). Reference numeral 7 is a monitor television connected to the transit 6.

A chuck portion 8 and a pushing portion 9 are provided on the front portion of the main body portion 5. The chuck portion 8 detachably chucks the inner pipe 11, and the pushing portion 9 pushes the outer pipe 12 to the right. The chuck part 8 is connected to a power part (not shown) built in the main body part 5, and the inner tube 11 is rotated about its axial center when the power part is driven. Also push section 9
Is supported by the support member 10 on the outside of the chuck portion 8
Is attached to the non-rotating portion of the main body 5 and the main body portion 5 moves forward on the base 3 to the right so that propulsive force is applied. Note that well-known mechanisms such as the main body portion 5, the chuck portion 8, and the pushing portion 9 are simply illustrated.

FIG. 2 is a sectional view of the tip portions of the inner pipe 11 and the outer pipe 12. The inner pipe 11 is inserted inside the outer pipe 12. As the underground excavation progresses, the inner pipes 11 are removably connected to each other at the joint portion 13, and the outer pipes 12 are welded to each other at the welded portion 14 or connected at the joint.

A blade portion 15 for excavating the ground is connected to a tip portion of the inner pipe 11 at the top by a welding portion 16.
A pipe 17 is arranged between the inner pipe 11 and the outer pipe 12. One end of the pipe 17 enters the inside of the blade portion 15 and is connected to a discharge portion 17a having a rubber valve, and the other end is connected to a synovial fluid feeder 18 (see FIG. 1). The synovial fluid pressure-fed from 18 is discharged from the discharge part 17a (see the broken line arrow 19 in FIG. 2), which reduces friction during excavation and enables high-speed, long-distance / curve linear application. The electromagnetic field method and the hydraulic pressure difference method are used to detect the position of long-distance / curved linear propulsion.

A light source 21 is provided on the outer surface of the inner tube 11. Reference numeral 22 denotes a cord, which is supplied to the light source 21 from a battery built in the main body 5 and the light source 21 is turned on.
A target 23 is provided on the inner surface of the outer tube 12. The target 23 is irradiated with light from the light source 21 to cause the target 23 to emit light, and the target 23 is observed from the outside of the inner tube 11 and the outer tube 12 by the transit 6 described above. Two
4 is an optical path of the transit 6. The target 23 is
It is desirable to apply a fluorescent coating so that it is easy to see, or to form a light-emitting body by forming it with a substance that is easy to see, such as a fluorescent substance. Reference numeral 25 is a bearing provided on the inner surface of the outer tube 12. In addition, a hole or a recess for securing the optical path 24 is formed in a portion of the transit 6 such as the joint portion 13 that obstructs the optical path 24 so that the target 23 can be observed without any trouble, and the electromagnetic field method or liquid The position can be measured more accurately by the pressure difference method.

4 (a) and 4 (b) are enlarged cross-sectional views of the bearing 25 in the brackets B and B in FIG. 2, respectively. Reference numeral 31 denotes a bearing body arranged on the outer circumference of the inner pipe 11, 32
Is a bearing body arranged on the inner circumference of the outer tube 12, and a bearer ring 34 is arranged between them. 33 is a sealing member provided between the outer tube 12 and the bearing body 32, 35 is a bearing ring provided between the bearing bodies 31 and 31, 36 is a padding, and 37 is a set screw. The pipe 17 is inserted through the padding 36 and the bearing body 31.

The excavation device for this underground hole is constructed as described above. Next, the excavation method will be explained. In FIG. 1, the first inner tube 11 is inserted into the first outer tube 12, and the rear end portion of the inner tube 11 is chucked by the chuck portion 8 to be in a horizontal posture. Then, while slowly rotating the inner tube 11 about its axis, a hydraulic device (not shown) is driven to move the main body portion 5 forward to the right, whereby the blade portion 1
The underground is excavated at 5. At this time, the synovial fluid is pressure-fed from the synovial fluid supplier 18 and is ejected from the ejection portion 17 a of the pipe 17 to the periphery of the blade portion 15.

As described above, when excavating the ground while rotating and advancing the blade portion 15, the light source 21 shown in FIG. 2 is turned on and the target 23 is observed at the transit 6 to check the inner pipe 11 and Monitor whether the outer tube 12 is straight and straight. Here, the inner tube 11 is rotating around its axis, but the outer tube 12 is non-rotating, so that the target 23 is intermittently irradiated with light and intermittently observed in the transit 6. It will be. The method for correcting the direction when the straightness is lost is as follows. That is, (1) use the characteristic of the boring method that corrects in the clockwise direction when digging clockwise, and in the left direction when digging counterclockwise, (2)
Direction correction by combined use of the eccentric blade 15 and repetitive excavation at a constant angle, (3) Direction correction by ejecting ground improvement material such as synovial fluid or mortar from the discharge part 17a of the pipe 17.

When the first inner pipe 11 and the outer pipe 12 have sufficiently advanced to the ground, the chuck portion 8 and the pushing portion 9 are connected to the inner pipe 1.
1 and the outer pipe 12 and the main body 5 is retracted rearward in FIG. 1, and then the second inner pipe 11 and the outer pipe 1 are removed.
Lower the tip of No. 2 into the departure pit 2A, the first inner pipe 1
1 and the rear end of the outer tube 12. Then, the rear end portion of the second inner pipe 11 is chucked by the chuck portion 8, and
After setting the pushing part 9 at the rear end of the second outer pipe 12, the inner pipe 11 and the outer pipe 1 are rotated while rotating the inner pipe 11 again.
2 is moved to the right to excavate.

After excavating to the end pit 2B as described above, the inner pipe 11 is removed in the following manner. That is, the blade portion 15 that has advanced into the target shaft 2B
When the main body 5 in the starting pit 2A is retracted after removing the inner pipe 11 from the inner pipe 11, the inner pipe 11 is pulled out from the inside of the outer pipe 12 to the starting pit 2A by this retracting force. Inner tube 11
The specific work of taking out the outer tube 12 from the outer tube 12 is as follows. In FIG. 2, the outer pipe 12 at the head is cut and cut from the welded portion A portion. In addition, regardless of the welded portion 14,
When connected by a joint, separate this joint. Next, the outer tube 12 at the front is advanced to the recess B at the rear of the blade section 15 (see the outer tube 12 shown by the chain line in FIG. 2) to expose the joint section 13 and the joint section 13
Disassemble. Since the outer diameter of the blade portion 15 is larger than the inner diameter of the outer pipe 12, the blade portion 15 and the inner pipe 11 are integrally formed.
Since it cannot be pulled out from the inner tube 11,
Is to be removed from.

FIG. 3 shows a state in which the earth and sand in the inner pipe 11 pulled out from the outer pipe 12 to the starting pit 2A is being discharged. As shown in the drawing, the inner pipe 11 is lifted and tilted by a wire of a crane, a chain 26, or the like to discharge the earth and sand clogged therein. The outer pipe 12 remains in the ground, and the outer pipe 12 serves as a casing, a sewer hole, and a cable hole. After discharging the earth and sand, the inner pipe 11 is reused after the joint part 13 is removed and separated. In this embodiment, the inner pipe 11 is pulled out to the starting pit 2A by the retreating force of the main body portion 5, but the inner pipe 11 is pushed out to the target pit 2B by the forward moving force of the main body portion 5.
In B, the earth and sand in the inner pipe 11 may be discharged by the method shown in FIG. The present invention is not limited to the above embodiments, for example, the light source for irradiating the target with light may be attached to the outer tube side, in short, the target or the light source may be provided between the inner tube and the outer tube. Is. If a light emitting element such as an external light diode is used as the target, no light source is needed. Further, if the synovial fluid discharge part is attached to the inner pipe 11 close to the blade portion and the synovial fluid feed pipe is provided by the above-mentioned method to expel the synovial fluid, the synovial fluid is also supplied to the inside of the inner pipe 11. This facilitates the movement of the inner sediment and enables the excavation and propulsion for a longer distance.

[0017]

As described above, according to the present invention, it is possible to observe a target with an observer and perform excavation while monitoring whether or not the excavation is being carried out straight ahead in the ground. While supplying synovial fluid,
It is possible to realize a long-distance small-diameter excavation means that can excavate even in a cobblestone layer and that has few troubles during excavation. When the excavation is complete, the inner pipe is pulled out from the outer pipe by the main body, leaving the outer pipe to be a hole in the ground, and discharging the clogged sand in the inner pipe to reuse the inner pipe. it can.

[Brief description of drawings]

[Fig. 1] Overall side view of an excavation device for an underground hole

FIG. 2 is a cross-sectional view of an inner pipe and an outer pipe of a drilling device for an underground hole.

[Fig. 3] Side view of an excavation device for an underground hole

FIG. 4A is an enlarged sectional view of a bearing portion, and FIG. 4B is an enlarged sectional view of a bearing portion.

[Explanation of symbols]

 2A Departure pit 2B Destination pit 5 Main body 6 Transit (observer) 11 Inner pipe 12 Outer pipe 15 Blade 17 Pipe 17a Discharge 21 Light source 23 Target

Claims (4)

[Claims] 1. A main body portion, a horizontal inner pipe to which a forward force and a rotational force are applied from the main body portion and a blade portion is provided at a tip end portion, and a non-rotating outer pipe into which the inner pipe is inserted. An excavation device for an underground hole, comprising: a target provided between the inner pipe and the outer pipe; and an observer for observing the target from outside the inner pipe and the outer pipe. 2. The underground hole excavating device according to claim 1, wherein the target is a luminous body. 3. A main body portion, a horizontal inner pipe to which a forward force and a rotational force are applied from the main body portion and a blade portion is provided at a tip portion, and a non-rotating outer pipe into which the inner pipe is inserted. And a pipe for feeding synovial fluid for ejecting synovial fluid around the blade portion, which is provided between the inner pipe and the outer pipe. 4. The inner tube inserted into the non-rotating outer tube is advanced horizontally from the starting pit to the target pit in a horizontal posture by the advancing force and the rotating force applied from the main body, When excavating the ground with a blade provided at the tip of the pipe, and when the excavation in the ground is completed, the blade is removed from the inner pipe, and then the inner pipe is moved forward with respect to the main body. Alternatively, a method of excavating an underground hole, characterized in that the earth tube is taken out from the outer tube to the starting pit or the target pit by a retreating force and the earth and sand clogged inside the taken out inner tube is removed.