JPH08326056A - Underground drilling cylinder insertion device - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To improve work efficiency by inserting a cylinder at the same time as drilling the ground. SOLUTION: A screw shaft drive part 15 and a cylinder body drive part 25 that rotate in opposite directions by a driving force from a rotating machine 4 on a guide table 2 installed in front of a vehicle body 1 are held in a non-rotating state. The screw shaft drive portion 15 of the rotary joint A composed of the holder 30 and the screw shaft 10
And the cylinder body 20 is attached to the cylinder body drive unit 25 in such a manner that the cylinder body 20 is fitted onto the screw shaft 10. Screw shaft 10
A fluid such as cement soil and water is fed to the injection hole 16 at the center of the rotary joint A in the air passage 18a around it.
Compressed air is supplied via. The down hammer 11 attached to the tip of the screw shaft 10 is driven by the compressed air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular body inserting device for an underground drilling machine, and more particularly to a tubular body inserting device for an underground drilling machine, which is capable of inserting the tubular body at the same time when excavating underground soil.

[0002]

[Prior art and problems] Generally, in civil engineering foundation work, in order to increase the foundation ground support, board piles should be constructed on all the grounds, or PC piles, H beam piles, and steel pipe piles should be inserted. However, when constructing by the conventional enforcement method, when drilling a stratum or boulder layer with a lot of water, the drilled holes often collapse, and the above piles should be inserted to the drilled depth. There were many problems that it was difficult. Further, even if the pile can be inserted up to the depth of the drilled hole, the pile supporting force may be insufficient, so that the pile may sink.

In order to solve the above-mentioned problems, a method of pouring a cylindrical iron pipe to the depth of perforation by a method such as pile driving and then injecting cement mortar for curing at the time of on-site pile construction is adopted. It has been. However, in the case of performing the construction by the method as described above, it is necessary to press-fit the cylindrical body after forming the hole, which complicates the construction and takes a long construction time, resulting in a decrease in work efficiency.

The present invention has been devised in order to solve the above-mentioned problems, and makes it possible to insert a cylindrical body at the same time as excavating the ground with an excavator and shortening the construction time. With the goal. Another object of the present invention is to insert a cylinder body at the same time as excavation, discharge minerals and soil toward the upper end of the cylinder body, and at the same time, to equip the inside with a cement soil device and inject cement mortar to form a stratum. To increase the strength of.

[0005]

In order to achieve the above object, the present invention installs a rotating machine for rotating a screw shaft and a cylinder on a guide stand installed in front of a vehicle body, and the rotating machine is a screw shaft. At the same time, the cylinder body is rotated in different directions, and at the same time, preferably, a cement soil device is provided at the center to blow air into the head (bit) to promote heat dissipation.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, with reference to FIG. 1, an overall configuration of a tubular body insertion device for an underground drilling machine according to the present invention will be described. The tubular body inserting device of the underground drilling machine is mounted on a vertical guide body 2 arranged on the traveling chassis 1 so as to be vertically movable, and is rotated in opposite directions by the operation of the rotating machine 4. A coupling (not shown) having dual inner and outer conducting parts, and a rotary joint A composed of a screw shaft driving part 15 and a cylindrical body driving part 25 respectively connected to inner and outer conducting parts of the coupling, The screw shaft 10 connected to the screw shaft drive unit 15 of the rotary joint A, and the cylindrical body 20 connected to the cylindrical body drive unit 25 of the rotary joint A and fitted on the screw shaft 10 (see FIG. 2, FIG. 1). And a down hammer 1 attached to the tip of the screw shaft 10.
1 and 1.

The rotating machine 4 is operated by an appropriate generator 5, and the screw shaft 10 and the down hammer 11 are integrally rotated through the coupling and the rotary joint A, and the tubular body 20 is rotated by the screw shaft. Rotate in the opposite direction to 10. The above-mentioned coupling is well known in the art, and the description of the coupling itself is omitted.

As shown in FIG. 2, the screw shaft driving portion 15 of the rotary joint A has a central shaft 17 having a cement injection hole 16 in the center, and the injection hole 16 is provided with a cement mixer 6 outside the machine. Cement mortar is injected.
An air passage 18a is formed around the injection hole 16, and the screw shaft 10 is provided below the central shaft 17.
A flange 19 for connecting the

An annular body 25a constituting a cylindrical body driving portion 25 is rotatably fitted around the outer periphery of the central shaft 17, and a first annular body is provided between the annular body 25a and the central shaft 17. Air holes 18 are formed, and the first air holes 18 communicate with the air flow path 18a. Further, the annular body 25a is formed with a plurality of openings 25b communicating with the first air holes 18. Further, the annular body 25a has a lower flange 26 at the lower end thereof, and a cylindrical body coupling hole 27 is formed therein, and the cylindrical body 20 is attached to the screw shaft 10 by a bolt 38 while being fitted onto the screw shaft 10.

A ring-shaped holder 30 is rotatably fitted around the outer periphery of the ring-shaped body 25a.
0 and the annular body 25a between the annular second air holes 28
Is formed, and the second air hole 28 communicates with the first air hole 18 through an opening 25b formed in the annular body 25a. A plurality of openings 30b are formed in the holder 30 at locations communicating with the second air holes 28.
b communicates with an external compressor 3 via an appropriate annular casing (not shown), and compressed air from the compressor 3 is discharged from the opening 30b to the second air hole 28, the opening 25b, and the first air hole 28b. The down hammer 17 is operated through the air hole 18 and into the air passage 18a formed in the central shaft 17. As will be described later, when using this excavator, the holder 30 is fixed in a non-rotating state such as the guide body 2 or the rotating machine 4 by an appropriate means.

In the present invention thus constructed, when the upper rotating machine 4 is driven, the screw drive section 15 and the cylindrical body drive section 25 rotate in opposite directions as described above, and the screw shaft 10 is rotated. Rotate to excavate the ground and cylinder 20
Can be inserted into the ground. This will be described in detail below.

While the upper rotating machine 4 is rotated by the generator 5, the central shaft 17 and the annular body 25a are rotated via a coupling and a rotary joint A (not shown), and at the same time compressed air from the compressor 3 is rotated by the rotary joint A. It is supplied from the opening 30b formed in the holder 30 of FIG. As a result, the screw shaft 10 coupled to the lower flange 19 of the central shaft 17 rotates, and the down hammer 11 attached to the lower end of the screw shaft 10 rotates to punch the ground. The slime generated at this time rides on the screw blade 10 ′ attached to the screw shaft 10 and is discharged to the outside. At the same time as drilling, the annular body 25 connected to the rotating machine 4
The cylindrical body 20 is inserted while rotating in the direction opposite to the screw shaft 10 via a, and the drilled holes are prevented from collapsing.

That is, the tubular body 20 is joined to the lower flange 26 of the annular body 25a which constitutes the tubular body driving portion 25, and the joint portion, that is, the upper end portion of the tubular body, has a plurality of holes 20 on the side surface. 'Is formed. As a result, the slime transferred by the screw blade 10 ′ is transferred to the cylindrical body 20.
Is sent to the outside for stable drilling work. In addition, the coupled cylinder 20 has a bolt 38 that penetrates the hole 27.
If the screw is loosened, the screw 10 can be easily separated, and the screw 10 can be pulled out in such a state.

At this time, the concrete mixer 6 can be operated while pulling out the screw shaft 10 to inject the cement mortar through the central cement injection hole 16, and continuously through the side air injection port 28. The compressed air sent by the compressor 3 is pressure-fed to smooth the movement of the bit during drilling, and the cement is uniformly distributed in the lower part of the hole during cement injection.
Such an action is disclosed in Japanese Patent Application Laid-Open No. 6-
No. 212870 (Korean application number 92-23838)
No. 6) and JP-A-6-212870 (Korea application number 93)
-09415), the detailed description is omitted.

[0015]

As described above, according to the present invention,
The work efficiency can be improved by inserting the cylinder at the same time as drilling the ground.

[Brief description of drawings]

FIG. 1 is an overall side view of the present invention.

FIG. 2 is a sectional view of a main part of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Car body, 2 ... Guide body, 4 ... Rotating machine, 10 ... Screw shaft, 15 ... Screw shaft drive part, 11 ... Down hammer, 16 ... Cement soil injection hole, 18a ... Air flow path,
20 ... Cylindrical body, 25 ... Cylindrical body drive part, 30 ... Holder, A ...
Swivel joint

Claims (3)

[Claims] 1. A cylindrical body insertion device for an underground drilling machine, comprising a rotating machine 4 on a guide board 2 of a vehicle body 1, and a screw shaft 10 and a down hammer 11 installed below the rotating machine 4. The screw shaft drive unit 15 for rotating the screw shaft 10 and the drive unit 25 of the cylinder for rotating the cylinder 20 are integrally configured, whereby the screw shaft 10 and the cylinder 20 are separated from each other. A cylindrical body inserting device for an underground drilling machine, wherein the cylindrical body can be inserted into the cylinder body at the same time as excavating by rotating the cylinder body in a direction. 2. The screw driving unit 15 has a cement injection hole 16 in the center thereof, an air hole 18 is formed around the cement injection hole, and a flange 19 for installing the screw shaft 10 in the lower portion. The tubular body insertion device for an underground drilling machine according to claim 1, wherein 3. An upper side of the tubular body driving portion 25 is connected to the rotating machine 4, an intermediate portion is supported by a holder 30, and a flange 26 for connecting the tubular body 20 to a lower portion.
The cylindrical body insertion device for an underground drilling machine according to claim 1, further comprising: