JPH01219293A - Direction correcting method and device thereof in percussion propelling method of steel pipe - Google Patents

Abstract

PURPOSE:To precisely correct a propelling direction of a pipe by inserting a direction correcting pipe having its front tilted between the tip shoe of an impulse system propeller used for a percussion propelling method of a steel pipe with small diameter and the tip of a thrust transfer pipe. CONSTITUTION:A thrust transfer pipe 7, in which a percussion device is incorporated, is so fitted to the internal of a buried pipe 6 pushed into along axis by a propeller that it is capable of sliding. After that, percussion is applied to the thrust transfer pipe 7 and the tip shoe 13 provided to the tip of the burried pipe 6 from the percussion device to propel. When a propelling direction deviates from a planned direction, a direction correcting pipe 15 having its front tilted for a small angle is inserted between the tip shoe 13 and the tip of the thrust transfer pipe 7. According to the constitution, the tip shoe 13 can be advanced toward the direction L2 having run-out of a small angle betaagainst the center line L1 of the thrust transfer pipe 7.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is mainly used for forming pipes used for various businesses such as electricity, communications, waterworks, and gas, in addition to sewerage pipes. The present invention relates to a direction correction method and device for a percussion propulsion method for steel pipes of small diameter (approximately 800 mm or less) using an impact type propulsion machine, which is used to bury steel pipes underground.

(Prior art) As this type of conventional technology, for example, Japanese Patent Application Laid-Open No. 60-242
There is one disclosed in No. 296.

In other words, an earth removal pipe with a built-in hammer device is slidably fitted inside a buried pipe that is pushed in the axial direction by a propulsion machine, and the tip of the earth removal pipe is guided by the inner peripheral surface of the buried pipe. It is provided to be movable in the axial direction, and comes into contact with a step on the inner peripheral surface of the leading pipe whose outer diameter is approximately equal to the outer diameter of the buried pipe, and the discharge pipe is struck in the axial direction by the operation of the hammer device. Earth is removed from the leading pipe by alternately repeating the action of moving the lead pipe forward and the follow-up action of pushing the buried pipe in the axial direction and bringing the tip into contact with the step formed on the outer periphery of the leading end of the lead pipe. A pipe laying method in which soil that has entered the pipe is removed to the outside by pulling out the soil removal pipe and the buried pipe is laid underground, and a soil removal pipe that can be fitted inside the buried pipe that is pushed in the axial direction by a propulsion machine. and a leading pipe that is slidable in the axial direction along the inner circumferential surface of the buried pipe, forming an earth removal storage space and a hammer storage space from the tip end inside the earth removal pipe. A hammer device for hitting the earth removal pipe in the axial direction is provided in the hammer storage space, and stepped portions are formed at the tips of the inner peripheral surface and the outer peripheral surface of the leading pipe, respectively, so that the tips of the earth removal pipe and the buried pipe can come into contact. discloses a pipe laying guide device in which the outer diameter of the leading end of the leading pipe is approximately equal to the outer diameter of the buried pipe.

(Problems to be Solved by the Invention) However, with the conventional impact propulsion method and device described above, the propulsion direction of the buried pipe in the ground often deviates from the planned direction.
Since the direction correction function was insufficient, there was a problem in that it was very difficult to accurately reach the buried pipe to the target position.

(Means for Solving the Problems) In order to solve the above-mentioned problems, in the present invention, a thrust transmission pipe with a built-in impact device is slidably fitted inside a buried pipe pushed in the axial direction by a propulsion machine. In a construction method in which the thrust transmission pipe and the tip shoe provided at the tip of the buried pipe are struck and propelled by the impact device, if the direction of propulsion deviates from the planned direction, the tip shoe and the tip of the thrust transmission tube A direction correction tube with an inclined front surface is interposed between the two.

Additionally, a direction correction tube with an inclined front surface interposed between the tip shoe and the tip of the thrust transmission tube is added to constitute a direction correction device in the percussion propulsion method for steel pipes.

(Function) As described above, in the present invention, when the propulsion direction of the buried pipe deviates from the planned direction, a direction correction pipe with an inclined front surface is interposed between the tip shoe and the tip of the thrust transmission tube. I did it like that.

In other words, when the most retracted part of the inclined end face of the direction correction tube is aligned with the direction to be corrected, the cutting edge of the tip shoe fitted to the direction correction tube will protrude toward the direction to be corrected. When the tip shoe is struck and propelled in this state, the tip shoe moves toward the direction correction side, and as a result, the direction of travel of the buried pipe is gradually corrected.

Therefore, according to the present invention, even in long-distance propulsion exceeding 50 m, the tube can be accurately guided to the destination point.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

Figure 3 shows the state in which preparation for propulsion is completed using the steel pipe percussion propulsion method using an air-impact propulsion machine.

In the figure, 1 is the ground where the steel pipe will be driven, 2 is the shaft installed in the ground 1 to implement the steel pipe percussion propulsion method, 3 is the base frame installed on the bottom of the shaft 2, and 4 is the top of the base frame 3 5 is a V-shaped roller pivotally supported on the upper end of these mounts 4, 6 is a buried pipe placed horizontally on the V-shaped roller 5, and 7 is a sliding guide member 8 inserted into the buried pipe 6. 9 is an air impact type propulsion device installed in the thrust transmission tube 7, and 10.11 is a connecting member for transmitting the force of this propulsion device 9 to the thrust transmission tube 7. , 12 is an air hose connected to the propulsion device 9.

Further, 6a is a tip fitting connected to the front part of the buried pipe 6,
Reference numeral 13 denotes a tip shoe fitted to the tip end of the tip metal fitting 6a and the thrust transmission tube 7. This tip shell 13 is formed with a groove 13a into which the tip fitting 6a of the buried pipe 6 fits, and a groove 13b into which the tip of the thrust transmission tube 7 fits.
Both of these grooves 13a and 13b are formed to be thick. Note that 13c is a partition between the grooves 13a and 13b, and 14 is a rubber ring inserted between this partition 13c and the tip fitting 6a.

In this embodiment, as shown in FIGS. 1 and 2, a stepped portion 15 that can fit into the inner peripheral surface of the tip of the thrust transmission tube
A cylindrical surface 15b is formed, and the front surface 15c of the cylinder is aligned with the center line of the cylinder! (see FIG. 2(b)) at an angle α (for example, 0.
The direction correction tube 15 is formed by inclining the tube by an angle of about 5° to 3°.

When the need for direction correction arises, a direction correction tube 15 with an inclined front surface 15c is interposed between the tip shoe 13 and the tip of the thrust transmission tube 7, as shown in FIG.

In this case, it is necessary to align the inclination direction of the front surface 15c with the direction to be corrected and to maintain that state. ) is recommended.

Next, the present invention will be explained in detail. The steel tube percussion propulsion device shown in FIG.
By reciprocating a piston (not shown) in the propulsion device 9, the piston strikes the head portion of the propulsion device 9, and the impact force is transmitted to the thrust transmission tube 7 and the tip via the connecting member 10.11. 4th by telling Shoe 13
As shown in the figure, a thrust transmission pipe 7 was driven into the ground 1, and a buried pipe 6 was pushed into the ground 1 by a propulsion device (not shown).

However, in the conventional method, there was no way to correct the propulsion direction of the buried pipe 6, so the propulsion direction of the buried pipe in the ground often deviated from the planned line.

According to the present invention, when the propulsion direction of the buried pipe 6 deviates from the planned direction, the direction correction pipe 15 with the front surface 15c inclined is interposed between the tip shoe 13 and the tip of the thrust transmission pipe 7.

That is, when the most retracted part of the inclined end surface 15c of the direction correction tube 15 is aligned with the direction to be corrected, the cutting edge of the distal shoe 13 fitted to the direction correction tube 15 is shown at 13d in FIG. If the tip shoe 13 is struck and propelled in this state, the tip shoe 13 will move toward the center line of the thrust transmission tube 7, as shown in FIG. Center line L2 of shoe 13
As shown, the buried pipe 6 moves toward the direction correction side by swinging by an angle β, and as a result, the direction of movement of the buried pipe 6 is gradually corrected.

(Effects of the Invention) As described above, according to the present invention, an excellent effect can be obtained in that the pipe can be accurately guided to the destination point even in long-distance propulsion exceeding 50 m.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the main parts of the percussion propulsion device equipped with the device of the present invention, Figure 2 (a) is a front view of the direction correction tube, Figures 3 and 4 are cross-sectional views thereof, and Figures 3 and 4 are It is an elevational view for explaining the process of the percussion propulsion method. 1... Ground 2... Vertical shaft 3... Base frame 4... Frame 5... V-shaped roller
6... Buried pipe 7... Thrust transmission pipe
8...Sliding guide member 9...Air impact propulsion machine 1
0.11...Connection member 12...Air hose
13... Tip shoe 14... Rubber ring
15...Direction correction tube 15c...Front patent applicant Matsuzaka Trading Co., Ltd. No. Ca) 15 (Direction correction tube) / Figure 2 (b) 15a (Il'lW)

Claims (1)

[Claims] 1. A thrust transmission tube with a built-in impact device is slidably fitted inside a buried tube pushed in the axial direction by a propulsion device,
In a construction method in which the tip shoe provided at the tip of the thrust transmission pipe and the buried pipe is propelled by impact using the impact device, if the direction of propulsion deviates from the planned direction, there is a gap between the tip shoe and the tip of the thrust transmission tube. , a direction correction method in a steel pipe percussion propulsion method, characterized by interposing a direction correction pipe with an inclined front surface. 2. A direction correction device in a percussion propulsion method for steel pipes, which has a direction correction tube with an inclined front surface interposed between the tip shoe and the tip of the thrust transmission tube according to claim 1.