JPH0598885A - Double pipe boring device - Google Patents

Abstract

PURPOSE:To avoid the jamming of a double pipe, and to enable the boring of a long hole even in any condition of the ground by using a device that is made up of a center-hole drifter or the like, when boring is carried out by giving a rotation and blow to both the inner pipe and the outer pipe. CONSTITUTION:A boring device that has been made up of a center-hole drifter 4 for giving a rotation and blow to an outer pipe 1 by holding the middle of the outer pipe 1, a blow-boring type down-the-hole hammer 3 continuously provided at the end of an inner pipe 2, and a rotary boring machine 5 that is connected to the base end of the inner pipe for giving only rotation to the inner pipe is installed. Then, rotation is given to the inner pipe 2 by the rotating chuck 51 of the rotary boring machine 5, and at the same time compressed air is supplied to the down-the-hole hammer 3, and boring is carried out by the rotation and blow of an inner bit 31. And then, the center hole drifter 4 is operated to transmit the rotation and blow of a rotary chuck 41 to the outer pipe 1, and boring is carried out by the rotation and blow of an outer bit 11 at the end. Further, the excavated earth is discharged to the outside of the hole through the space between both pipes 1 and 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double pipe punching device capable of individually giving a rotary striking force to an inner double pipe and a double pipe.

[0002]

2. Description of the Related Art It is known to use an inner and outer double tube for perforation. Attach an inner bit to the tip of the inner tube,
An outer bit is attached to the tip of the outer tube, the same drive source is joined to the base ends of the inner tube and the outer tube, and the tubes are perforated by rotating or striking or adding them in combination. Further, two sets of drive sources are joined to the base ends of the inner pipe and the outer pipe, respectively, and rotation or striking or a combination thereof is applied to the inner pipe, and the outer pipe is perforated by rotating. Regarding the action of the inner pipe and outer pipe of such double pipe perforation,
The outer pipe prevents collapse of the hole wall and excavates the tip of the outer bit, and the inner pipe functions as a channel for air and water used for excavating the tip of the inner bit and discharging cutting waste. In addition, the space between the peripheral surfaces of the inner and outer pipes functions as a discharge channel for excavated debris.

[0003]

[Problems to be Solved by the Invention] The above-described conventional drilling technique has the following problems. <a> In the case of rotation and striking applied from the same drive source from the base ends of the inner and outer double tubes, the longer the total length of the inner and outer tubes, the greater the resistance to rotation with the hole wall in the outer tube. As a result, a rotation blocking phenomenon (jamming) easily occurs. Further, in the inner pipe, the gap between the peripheral surfaces of the both pipes causes the inner pipe to meander, and the drilling ability is reduced. For example, when piercing a rock ground that has been crushed, a small lump of crushed rock is sandwiched between an outer pipe and a hole wall, and the small lump easily exhibits a wedge action to prevent rotation of the outer pipe. When rotation of the outer tube is blocked, drilling is impossible, so the double tube is pushed and pulled while applying rotation and impact. However, when the tip portion of the inner bit is separated from the bedrock while repeating the push-pull operation of the double pipe, the inner bit is suspended and the inner bit is released from the rotational resistance. As a result, only the striking slide acts on the inner rod, which induces loosening or disengagement of the screw at the connecting portion of the rod. If the connection part of the inner rod becomes loose or comes off, the air and water for discharging the cutting waste will not be discharged from the tip of the inner bit, and the cutting waste will accumulate on the bottom of the hole, and this cutting waste will be caught on the outer periphery of the ring bit. And the rotation prevention phenomenon reoccurs. When drilling hard rock ground with few cracks, the hole wall is retained and the rotation prevention phenomenon of the outer pipe does not occur, but if the drilling length becomes long, the inner pipe meandering reduces the drilling ability of the inner bit, and as a whole Drilling speed decreases. <B> In the method of adding only rotation from the base end of the outer pipe, when boring the rock ground that has been crushed, the hole wall collapses and a small block of crushed rock is sandwiched between the outer pipe and the hole wall, It tries to prevent the rotation of the tube. In the case of this method, since the impact vibration cannot be applied to the outer tube to remove the small crushed rocks, the rotation of the outer tube is easily prevented.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and its purpose is to avoid jamming of a double pipe, which is not affected by the ground condition, and which has a long hole. It is to provide a double pipe punching device capable of

[0005]

That is, according to the present invention, an inner pipe is inserted into an outer pipe, and a double pipe punching device for punching by rotating and striking the inner pipe and the outer pipe grips the middle of the outer pipe. From the center hold lifter that gives rotation and impact to the outer pipe, the down hole drilling hammer that is connected to the tip of the inner pipe, and the rotary boring machine that connects to the base end of the inner pipe and only rotates the inner pipe. In addition, the down-the-hole hammer and the rotary boring machine are configured to be slidable along the same guide cell. Furthermore, the present invention inserts an inner tube into an outer tube, and in a double-tube perforating apparatus for perforating an inner tube and an outer tube by applying rotation and impact, a center hold lifter that applies rotation and impact from the base end of the outer tube, From an adapter interposed between the outer pipe and the center hold lifter, a perforation-type down-the-hole hammer connected to the tip of the inner pipe, and a rotary boring machine that connects to the base end of the inner pipe and gives only rotation to the inner pipe. In addition, the down-the-hole hammer and the rotary boring machine are configured to be slidable along the same guide cell.

[0006]

DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the drawings. <A> Outer tube FIG. 1 shows an example of a punching device according to the present invention. Reference numeral 1 is an outer tube having an outer bit 11 at the tip thereof, and a tubular joint tool 12 is connected therebetween so that the length of the entire length can be adjusted. One of the features of the present invention is to grasp the middle of the outer tube 1 and to rotate and hit the outer tube 1 to perforate the outer tube 1.
Therefore, on the outer periphery of the outer tube 1, as will be described later, a protrusion along the axial direction and a protrusion in the circumferential direction are formed. The ridges in the axial direction are protrusions for receiving a rotational force on the outer tube 1, and the ridges in the circumferential direction are protrusions for receiving a striking force. <B> The inner tube 2 is a hollow inner tube, and the joint tool 21 is connected therebetween so that the length of the entire length can be adjusted. A down-the-hole hammer 3 is connected to the tip of the inner pipe 2, and an inner bit 31 that can be punched by striking is provided at the tip thereof.
One of the features of the present invention is that the inner pipe 2 is rotated only by using the impact of the down-the-hole hammer 3 so that both the rotational motion and the impact motion can be finally imparted to the inner bit 31. An air supply hose 33 is connected to the base end of the inner pipe 2 via an air swivel 32 so that compressed air can be supplied to the down the hole hammer 3 through the inside of the inner pipe 2. <C> Center-hold lifter The center-hold lifter 4 is a device for rotating and striking the outer tube 1, and is a cylindrical rotary chuck 41 that can hold and release the outer tube 1, and a cylindrical piston 42 that strikes the rotary chuck 41.
Consists of. The rotary chuck 41 is slidable along the striking direction, and is configured to be able to apply both rotation and striking motions to the outer tube 1 while holding the outer tube 1. <D> Rotary Boring Machine The rotary boring machine 5 is a well-known center hole type device that applies a rotational force to the inner tube 2, and is equipped with a rotary chuck 51 that can hold and release the inner tube 2. The center hold lifter 4 and the rotary boring machine 5 are engaged with the same guide cell 6, and the approach distance can be adjusted by extending a cylinder 7 arranged between the devices 4 and 5.

[0007]

Next, the perforation method will be described. <A> Drilling by inner tube The rotary chuck 51 of the rotary boring machine 5 grips the peripheral surface of the inner tube 2 to give rotation to the inner tube 2. At the same time, compressed air is sent to the down the hole hammer 3 to operate it. As a result, the inner bit 31 is rotated by the inner pipe 2 and simultaneously hit by the down-the-hole hammer 3 to punch the inner bit 31. <B> Drilling by outer tube When the center hold lifter 4 is operated, the rotation and impact of the rotary chuck 41 are transmitted to the outer tube 1 via the ridges formed on the peripheral surface of the outer tube 1. As a result, the outer bit 11 at the tip of the outer tube 1 is rotated and hit to punch. <C> Discharge of soil Slime-like soil is discharged from the hole through the space between the peripheral surfaces of both pipes 1, 2.

<Other Embodiments> FIG. 2 shows another embodiment in which the outer tube 1 and the center hold lifter 4 are perforated by interposing an adapter 8 therebetween. The adapter 8 is composed of a tubular body, and both ends thereof are provided with screws for screwing to the outer tube 1 and the center hold lifter 4. Further, a through hole 81 is provided at the center of the adapter 8 so that slime-shaped shavings can be discharged from the soil discharging swivel 9 which is provided on the outer periphery of the adapter 8. Reference numeral 82 in the drawing denotes an annular seal member provided in the adapter 8. According to the present embodiment, since the impact transmission efficiency is good, the drilling speed is fast with respect to the hard ground.

[0009]

Since the present invention is as described above, the following effects can be obtained. <B> Rotation and impact can be effectively applied from the middle of the inner pipe. <B> Both rotational and striking motions can be imparted to the inner bit at the tip of the inner pipe by the rotational force applied to the inner pipe and the striking force of the down-the-hole hammer provided at the tip of the inner pipe. In particular, when the inner pipe becomes long, it is possible to prevent buckling of the inner pipe and effectively transmit force. Further, since it is not necessary to apply a striking force to the inner pipe, the consumption is reduced. <C> When the outer tube starts to jam, only the outer tube can be hit and rotated, so there is no need to worry about the inner rod connecting part coming loose or coming off. <D> By operating the two sets of drive sources individually or mutually, it is possible to perform long drilling regardless of the ground conditions.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a double pipe punching device according to the present invention.

FIG. 2 is a vertical cross-sectional view of another double pipe punching device using an adapter.

Claims (2)

[Claims] 1. A double-tube punching device for inserting an inner tube into an outer tube and punching the inner tube and the outer tube by rotating and striking the outer tube to grip the middle of the outer tube and rotate and strike the outer tube. It consists of a center hold lifter to give, a perforation type down the hole hammer connected to the tip of the inner pipe, and a rotary boring machine connected to the base end of the inner pipe to give only rotation to the inner pipe. A double pipe perforation device, which is configured to be slidable along the same guide cell. 2. A center hold lifter for inserting a inner tube into an outer tube and punching by rotating and striking the inner tube and the outer tube, wherein a center hold lifter applies rotation and striking from a base end of the outer tube. , An adapter interposed between the outer pipe and the center hold lifter, a perforation-type down-the-hole hammer that is connected to the tip of the inner pipe, and a rotary boring machine that connects to the base end of the inner pipe and only rotates the inner pipe. The double-tube drilling device is characterized in that the down-the-hole hammer and the rotary boring machine are configured to be slidable along the same guide cell.