JPH0586790A - Water filling type cave excavating method and device therefor - Google Patents

Abstract

PURPOSE:To enhance the rectilinear propulsion effect in a cave excavating method. CONSTITUTION:In a cave excavating device, as a thread extension type excavator 6, a thread extension type oneside-tapered pilot pipe 21 is attached to a thread extension type pilot pipe 22. Accordingly, this arrangement is rotatingly press-inserted into the ground so that the rotary shaft of a thread extension type excavator with the ground being used as a bearing can be provided, thereby it is possible to enhance the rectilinear propulsion effect.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw-joint excavator for excavating a lateral hole having a relatively small diameter, such as a lateral hole for constructing a storage pipe for a telephone line, a signal line or a power line buried underground. The present invention relates to a water injection type horizontal hole excavation method and apparatus therefor.

[0002]

2. Description of the Related Art A conventional horizontal hole excavation method using a screw replenishing type excavator is, as shown in FIGS. 7 (a), 7 (b) and 7 (c), a main chuck 1, a rotary chuck 2 and a rotary chuck rotating motor 3. , A horizontal hole excavator composed of a propulsion motor 4 and a guide rail 5 is used as a starting vertical hole 18 as shown in FIG.
Fixed in the groove of No. 1, the arrowhead type propulsion head 8 is attached to the tip of the first screw replenishment type excavator 6, the rotary chuck 2 grips this, and the screw replenishment type excavator 6 is rotated by the rotation motor 3. Water is injected from the tip of the propulsion head 8.
While reciprocating, the propulsion motor 4 reciprocates the propulsion unit 10 along the guide rail 5 to excavate the earth and sand from the side surface of the vertical hole and discharge the excavated earth and sand into the vertical groove,
The second and subsequent screw-replenishing type excavation tools 7 are added and propelled until reaching a reaching vertical hole 19 which is separated from a starting vertical hole 18. However, in this method, as shown in (b), the right-handed screw replenishment type excavator 7 has its own weight 11 and a rotational force 12.
And propelling force 13 have the characteristic of propelling in the diagonally right lower front direction which is the resultant force 14. By pouring water 9 from the tip of the propulsion head, the natural ground 15 in front of the propulsion loosens, and this characteristic becomes more prominent. , (C), the screw addition type excavator 7 draws a three-dimensional curve with respect to the propulsion target 16 because the rigidity is not sufficient, and the reaching position 17 moves considerably to the lower right direction. Was there.

When small gravel or the like is present in the propulsion ground, the rotating propulsion head 8 first comes into contact with the propulsion head 8 so that the propulsion head is bounced by the small pebbles, and the screw joint type excavator 7 is rigid. Is insufficient, the propulsion direction can be easily changed, and the linear propulsion property is low. Therefore, the screw addition type excavator 7 does not reach the reaching vertical hole 19,
If the pipe embedding object 20 or the like is present near the propulsion position, there is a risk that the screw-joining type excavator 7 may come into contact therewith and damage it.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been proposed to solve the above-mentioned drawbacks, and its object is to provide a screw joint type taper as a tip conduit of a screw joint type excavator in a horizontal hole excavating device. By attaching an attached pilot pipe, it will be rotationally pressed into the ground to serve as the axis of rotation of the screw-equipped excavator using the natural bearing as a bearing, and restrain the movement due to rotation of the screw-supplemented excavator. Then, it is an object of the present invention to provide a water injection type horizontal hole excavating method using a screw replenishing type excavating tool which has remarkably improved linear propulsion property, and a device used therefor.

[0005]

In order to achieve the above object, the present invention provides a pipe-like screw-combining one-tapered pilot pipe having a tapered surface at the tip and a threaded portion at the rear, and a screw at both ends. Using a pipe-shaped screw replenishment type pilot pipe having a portion, the rotating chuck of the propulsion unit of the excavator provided in the starting vertical hole, to hold the screw joint type one-tapered pilot pipe, the rotating chuck The first step of rotating and rotating the propulsion unit to rotate and press fit the pilot pipe with a taper with a screw joint in the ground, and after the press fitting, open the rotary chuck to open the pilot pipe with a taper with a screw joint. And retreat the propulsion unit, make the rotary chuck hold the screw joint type pilot pipe, and use the screw joint type pilot pipe and the screw joint type one tapered taper. The second step of screwing the lot tube with the rotation chuck and rotating the rotation chuck, advancing the propulsion unit and rotating the press-fitting pilot taper pipe with one side taper into the ground, and rotating after press-fitting. Open the chuck, remove the screw joint type pilot tube, retract the propulsion unit, then let the rotary chuck grip the screw joint type pilot tube, and screw together the screw joint type pilot tubes by rotating the rotary chuck. Then, while rotating the rotary chuck, the propulsion unit is advanced and the third step of screwing the pilot pipe with a taper with a screw joint into the ground is press-fitted. 3 times until it is more than double the moving length of
Repeat the fourth step, and after press fitting, open the rotary chuck, remove the screw joint type pilot pipe, retract the propulsion unit, and then add the screw joint to the rotary chuck. Hold the excavator,
The screw replenishing type excavator and the screw replenishing type pilot pipe are screwed together by rotation of a rotary chuck, water is injected from the tip of the screw replenishing type propulsion head, and the propulsion unit is advanced while rotating the rotary chuck and a starting vertical hole. Fifth step of excavating while excavating in the ditch, and after advancing the propulsion unit,
After releasing the rotary chuck, removing the screw joint type excavator and retracting the propulsion unit, the rotary chuck is made to grip the screw joint type excavator, and the screw joint type excavators are screwed together by rotating the rotary chuck. A sixth step of pouring water from the tip of the screw-joint type propulsion head, rotating the rotating chuck, advancing the propulsion unit and excavating while excavating in the starting vertical hole groove, and the screw-joint type propulsion SUMMARY OF THE INVENTION A gist of a water injection type horizontal hole excavating method is characterized in that a horizontal hole is excavated by a seventh step in which the sixth step is repeated until the head reaches the reaching vertical hole. Furthermore, the present invention uses a screw joint type drilling tool between two vertical holes that are spaced apart from each other in the ground, and in a water injection type horizontal hole drilling device that penetrates the ground while rotating and excavating the ground, A screw addition type propulsion head screwed to the addition type drilling tool and having a water injection port, one or a plurality of screw addition type pilot pipes screwed to the screw addition type propulsion head, and screwed to the screw addition type pilot pipe SUMMARY OF THE INVENTION A water-injection type horizontal hole excavating device, characterized in that it is provided with a screw addition type one-tapered pilot pipe.

[0006]

According to the present invention, in a horizontal hole excavating method using a screw-joint type drilling tool, a screw-joint type one-tapered pilot pipe is attached to the tip of the screw-joint type drilling tool and is rotationally press-fitted into the ground as a leading conduit. With this, one end serves as a bearing and the other end serves as a rotation axis of the screw-joint type excavator with the horizontal hole propeller as a bearing, and restrains the movement to the lower right front due to the rotation of the screw-joint type excavator. It also prevents the propulsion head from bouncing due to small gravel in the ground and changing the propulsion direction, and has the effect of significantly improving straight-line propulsion.

[0007] The conventional technique is to install a screw joint type taper pilot pipe on the tip of a screw joint type excavator to restrain movement due to rotation to the lower right front and to move small pebbles in the ground. The difference is that it is possible to suppress the propulsion head from bouncing and changing the propulsion direction.

[0008]

EXAMPLES Next, examples of the present invention will be described. It is needless to say that the embodiment is merely an example, and various modifications and improvements can be made without departing from the spirit of the present invention.

1 (a), 1 (b) and 1 (c) are views for explaining an embodiment of the present invention, in which 1 is a main chuck, 2 is a rotary chuck, 3 is a rotary chuck for rotation. Motor, 4 is a propulsion motor, 5 is a guide rail, 6 is a screw joint type excavator, 10 is a propulsion unit, 21 is a screw joint type tapered taper pipe, 22 is a screw joint type pilot pipe, and 23 is a screw joint type. Type propulsion head.

FIG. 2 is a view for explaining the structures of a screw joint type one-tapered pilot pipe, a screw joint type pilot pipe and a screw joint type propulsion head used in the present invention, in which 21 is a screw joint. Pilot taper with one side taper, 22 is a pilot pipe with screw connection, 23
Is a screw joint type propulsion head, 26 is a nut part, 27 is a bolt part, and 28 is a water injection port. Due to this structure, the screw joint type pilot pipe with one taper 2
1 and the screw replenishing type propulsion head 23 can be easily connected by the nut portion 26 and the bolt portion 27, and the screw replenishing type excavator 6 can be connected in the same manner. Water for water filling 28
It is possible to eject from the above, and the rotary excavation by the screw-replenishing type propulsion head 23 can be easily performed as usual.

To operate this, as the first procedure,
Main chuck 1 to guide rail 5 as shown in FIG.
A horizontal hole excavator equipped with is fixed in the vertical groove, and the rotary chuck 2 is screwed to the pilot pipe 21 with one taper.
While the screw chuck is gripped by the rotary chuck rotating motor 3 to rotate the pilot pipe 21 with one-piece taper, the propulsion motor 4 moves along the guide rail 5,
The propulsion unit 10 is moved forward, and a pilot pipe 21 with a one-side taper is screwed into the ground by press-fitting.

As a second procedure, as shown in (b), the rotary chuck 2 is opened, the pilot pipe 21 with one-tapered screw joint is removed, and the propulsion unit 10 is retracted. The pilot pipe 22 is gripped and the rotary chuck 2 is rotated to join the pilot pipe 21 with the screw addition type one-side taper, and rotational press-fitting is performed as in the first procedure. This procedure is repeated until the length of the screw joint type pilot pipe 22 becomes more than twice the moving length of the propulsion unit 24.

As a third procedure, as shown in (c), the screw chuck type excavator 6 having the screw type thrusting head 23 attached to the rotary chuck 2 is gripped, and the rotary chuck 2 is rotated to add the screw type. Excavation is performed while water is injected from the tip of the screw joint type propulsion head 23 by joining with the pilot pilot pipe 22, and the excavated soil is screwed together while the propulsion unit 10 is moved forward and backward, and the start of the excavation tool 6 is started in the vertical hole groove. Then, the excavation is carried out while excavating the soil, and thereafter, the screw excavating tool 6 is sequentially connected in the same manner, and the excavation is carried out while the excavation is carried out.

3 (a), (b), (c), and (d),
It is a figure explaining the propulsion mechanism by this invention, Comprising: 6
Is a screw joint type drilling tool, 9 is water injection, 21 is a screw joint type one tapered pilot pipe, 22 is a screw joint type pilot pipe, 23 is a screw joint type propulsion head, 28 is a water injection port, and 15 is disturbed by water injection Rocks 29 are small pebbles in the ground.

FIG. 3 (a) shows an excavation and propulsion situation in which the propulsion unit has advanced, and the screw joint type one-tapered pilot pipe 21 and the screw joint type pilot pipe 22 are rotationally press fit into the ground, If a small gravel is present in the excavated rock, it will come into contact and bounce when the excavated rock has a small gravel as it serves as the axis of rotation for excavation by the screw-completion-type propulsion head 23 that uses the rock as a bearing and as the rotation earth of the screw-completion-type excavator 6 The propelling direction is changed and the propelling characteristics of propelling to the lower right by the rotation of the screw joint type excavator 6 are suppressed, and the screw joint type one-tapered pilot pipe 21 and the screw joint type used as the front conduit are suppressed. Since the pilot pipe 22 has a smaller diameter than the screw replenishment type excavator 6, even if gravel exists in the propulsion ground, it is difficult to contact the gravel and the propulsion direction cannot be changed.

FIG. 3B shows the excavation and propulsion situation in which the propulsion unit has moved backward. In this case as well, the lengths of the screw joint type one-tapered pilot pipe 21 and the screw joint type pilot pipe 22 are the same as those of the propulsion unit. By making it more than twice the moving length, these will not enter the ground disturbed by water injection 9, but will be a rotating shaft with the propulsion ground as a bearing, and a screw joint type drilling tool to improve straight-line propulsion. It counters the propulsion characteristics of 6.

However, when the lengths of the screw joint type one-tapered pilot pipe 21 and the screw joint type one pilot pipe 22 are close to the moving length of the propulsion unit, as shown in FIG. 3C, the screw joint type one taper is used. Attached pilot pipe 21 and screw joint type pilot pipe 22 enter the ground 15 disturbed by water injection, or screw joint type one taper with pilot pipe 21 coming out of the hole press-fitted, screw joint type one taper The straight propelling property of the pilot pipe 21 as the leading conduit is lost, and the propelling property of propelling to the lower right front by the rotation of the screw addition type excavator 6 appears.

Next, the taper angle of the screw joint type one-tapered pilot pipe 21 will be described. As for the pilot taper with one-sided taper, several kinds of one-sided taper angles have been tested to confirm the propulsion accuracy of sandy soil and cohesive soil by rotational press-fitting. It has been confirmed that the propulsion error increases at both small angles and angles greater than 20 °. Therefore, in the present invention, the one-side taper angle of the taper surface 31 of the one-side tapered pilot pipe is 2 as shown in FIG.
It was set to 0 °. The one-tapered pilot pipe is
Cut a cylindrical pilot tube diagonally like a bamboo spear (2
0 °), and a structure in which an iron plate is welded to the cut surface so that earth and sand do not enter.

The one-tapered pilot pipe is shown in FIG.
As shown in (a) to (e), small gravel 3 is present in the propulsion ground.
Even if there are two or the like, by rotating and press-fitting the one taper, the flat surface portion of the one taper has the effect of pushing the small gravel or the like away from the propulsion position. That is, as shown in (a), the small gravel 3 is smaller than the tapered surface 31.
When the two come into contact with each other, as shown in (b), the small gravel is gradually pushed away laterally by the flat surface (tapered surface) of the one taper. Eventually, as shown in (e), it is pushed away by the side of the pilot pipe and does not affect the propulsion.

FIG. 6 shows the case of a general taper. In the case of a general taper, straightness is improved, but FIG.
As shown in (a) to (d), there is only one position where the small gravel or the like comes into contact with the taper even when rotationally press-fitted, and there is no effect of pushing the small gravel or the like away from the propulsion position. The propulsion position can be changed. Therefore, in the present invention, it can be understood that the method of rotationally press-fitting the one-tapered pilot pipe is effective.

[0021]

As described above, according to the present invention, a screw joint type one-tapered pilot pipe is attached as a tip conduit of a screw joint type excavator in a horizontal hole excavator, and this is rotationally press-fitted into the propulsion ground. By acting as the axis of rotation of the screw addition type excavator with bearings on the natural ground, it restrains the movement due to rotation of the screw addition type excavation tool, and suppresses the characteristic of propelling to the lower right front, which we had until now, and goes straight. It has the effect of significantly improving propulsion.

[Brief description of drawings]

FIG. 1 shows an embodiment of a lateral hole drilling method of the present invention.
(A), (b), (c) shows the order of steps.

FIG. 2 shows a structural example of a pilot pipe with a one-side taper of a screw joint type as a leading conduit.

FIG. 3 shows an example of propulsion of a pilot tube with a screw joint and a taper. (A)-(d) is an example of propulsion.

FIG. 4 shows a structure of a tip portion of a pilot pipe with a one-tapered screw joint type.

5 (a) to 5 (e) are views for explaining the operation of the pilot pipe with one-tapered screw addition type.

6 (a) to 6 (d) are views for explaining the operation of a conventional example.

7 (a) to 7 (c) are diagrams showing the structure and operation of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main chuck 2 Rotating chuck 3 Rotating chuck Rotating motor 4 Propulsion motor 5 Guide rail 6 Screw addition type excavator 7 Screw addition type excavator 8 Propulsion head 9 Water injection 10 Propulsion unit 11 Self-weight 12 Rotational force 13 Propulsion force 14 Combined force 15 Loose portion of propulsion ground 16 Propulsion target position 17 Reaching position 18 Starting vertical hole 19 Reaching vertical hole 20 Other pipe buried object 21 Screw joint type pilot taper pilot pipe 22 Screw joint type pilot pipe 23 Screw joint type propulsion head 24 Propulsion unit Traveling length 25 Screw addition type pilot pipe length 26 Nut part 27 Bolt part 28 Water injection port 29 Gravel 30 Straight driving line 31 Tapered surface 32 Small gravel

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takenori Uchida 1-1-6 Uchiyuki-cho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Toshiyuki Katai 1-1-6 Uchiyuki-cho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Tetsuo Ishikawa 4-1-2 Hirano, Chuo-ku, Osaka-shi, Osaka Prefecture Osaka Gas Co., Ltd. (72) Inventor Susumu Adachi 4-1-1, Hirano, Chuo-ku, Osaka-shi, Osaka No. 2 within Osaka Gas Co., Ltd.

Claims (2)

[Claims] 1. A pipe-shaped screw-joint type one-tapered pilot pipe having a tapered surface at the tip and a threaded portion at the rear portion, and a pipe-shaped screw-joint type pilot pipe having screw portions at both ends are used. The rotary chuck of the propulsion unit of the excavator provided in the starting vertical hole is made to grip the screw joint type one-tapered pilot pipe, and while rotating the rotary chuck, the propulsion unit is advanced, Rotating press-fitting one-tapered pilot pipe with screw addition type 1st
After the press-fitting, the rotary chuck is released, the screw joint type one-tapered pilot pipe is removed, the propulsion unit is retracted, and the rotary chuck is screwed to hold the pilot pipe type.
The screw joint type pilot pipe and the screw joint type one taper pilot pipe are screwed together by the rotation of the rotary chuck, and the propulsion unit is advanced while rotating the rotary chuck, and the screw joint type one taper pilot pipe is advanced into the ground. The second step of rotationally press-fitting is performed, and after press-fitting, the rotary chuck is opened, the screw joint type pilot pipe is removed, the propulsion unit is retracted, and then the rotary chuck is made to hold the screw joint type pilot pipe, The third step of screwing the extension type pilot tubes together by the rotation of the rotary chuck, rotating the rotary chuck, advancing the propulsion unit and advancing the screw addition type taper pilot pilot tube into the ground, and the third step. Repeat the third step until the total length of the screw replenishment type pilot pipe becomes more than twice the moving length of the propulsion unit. After the press-fitting, the rotary chuck is opened, the screw joint type pilot pipe is removed, the propulsion unit part is retracted, and the rotary chuck is made to grip the screw joint type drilling tool with the screw joint type propulsion head attached. A screw replenishing type excavator and a screw replenishing type pilot pipe are screwed together by rotation of a rotary chuck, water is injected from the tip of the screw replenishing type propulsion head, and the propulsion unit is advanced while rotating the rotary chuck, and a start vertical groove is formed. Fifth step of excavating while excavating inside, and after advancing the propulsion unit, open the rotary chuck, remove the screw addition type excavator, retract the propulsion unit, and then screw the rotary chuck. Hold the add-on type excavator and screw the add-on type excavators with each other by rotating the rotary chuck.
A sixth step of pouring water from the tip of the screw addition type propulsion head, rotating the rotary chuck, advancing the propulsion unit and excavating while excavating in the starting vertical hole groove, and the screw addition type propulsion head A horizontal hole drilling method for water injection, characterized in that a horizontal hole is drilled by a seventh step in which the sixth step is repeated until the reaching vertical hole is reached. 2. Between the two vertical holes provided in the natural space,
In a water injection type horizontal hole excavation device that uses a screw joint type drilling tool and penetrates the ground while rotating and excavating and excavating soil, a screw joint type propulsion head that has a water injection port screwed into the screw joint type drilling tool, and A water-injection system characterized by comprising one or more screw-joint type pilot pipes screwed to the screw-joint type propulsion head, and a screw-joint type one-tapered pilot pipe screwed to the screw-joint type pilot pipe. Horizontal hole drilling equipment.