JPH0355394A - Direction corrector of small diameter pipe promoter - Google Patents

Abstract

PURPOSE:To correct the direction of a guide pipe, by providing an extensible direction-correcting member by means of a hydraulic cylinder at the outer periphery of the front end of the guide pipe and receiving the earth pressure, protruding the correction member from the outer periphery of the guide pipe when the guide pipe is deviated from a projected line. CONSTITUTION:A direction-correcting device 7 is composed of a fan-shaped direct-correction member 7a pivoting the front edge at a guide pipe 1 by a pin 8 and a hydraulic cylinder 9 rotating arround the pin 8. A direction- correcting face 7b of the direction-correcting 7a is inserted into the inner side of the guide pipe 1 from a slit 1b to become the same plane with the outer peripheral face 1 on moving straight. And the direction-correcting member 7a is projected outward from the guide pipe 1 by the hydraulic cylinder 9 in the case of correcting the direction to receive the earth pressure on the direction-correction face 7b. And further, when the progressing direction of the guide pipe 1 is deviated from a projected line 10, the direction-correcting member 7a is rotated by the hydraulic cylinder 9 to project it from the outer peripheral face of the guide pipe to actuate the earth pressure on the direction- correting face 7b and to correct the front end for the projected direction.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to a device for correcting the direction of a lead pipe propelled underground by a small diameter pipe propulsion machine.

(Prior art) When burying a small diameter pipe with high precision using a conventional small diameter pipe propulsion machine, a leading pipe is propelled along a planned line in advance, and the small diameter pipe is propelled using the leading pipe as a guide. construction method is generally adopted.

In this type of propulsion method, the burying accuracy of the lead pipe is the same as that of a small diameter pipe, so conventionally a pyro or tohesodo that can control direction is attached to the tip of the lead pipe. If the propulsion direction deviates from the planned line, the pyroft head corrects the propulsion direction.

Also, as a method of controlling the direction of the pilot head, the pyroft head is bent relative to the leading pipe using a hydraulic cylinder. Rotate the direction control member with an inclined end surface to direct the inclined surface in the opposite direction of the correction direction. A method is used to correct the direction by utilizing the earth pressure applied to this slope during propulsion.

(Problems to be Solved by the Invention) However, all of these directional control methods have disadvantages such as being expensive due to their complicated structures and making directional control difficult due to the small diameter of the leading pipe.

The present invention has been made in order to improve the above-mentioned problems, and it is an object of the present invention to provide a direction correction device for a small-diameter pipe propulsion machine that allows direction correction of a leading pipe with a simple structure.

(Means and effects for solving the problem) In order to achieve the above object, the present invention provides a small diameter pipe propulsion machine that propels a lead pipe underground by a propulsion device installed in a starting shaft. At the outer periphery of the tip of the above-mentioned leading pipe, there are multiple direction adjustment members that can be moved in and out using hydraulic cylinders. A direction correction device for a small-diameter pipe propulsion machine is provided, in which the direction of the lead pipe is corrected when the lead pipe deviates from the planned line by protruding the direction correction member from the outer peripheral surface of the lead pipe and receiving the ground. This is what we provide. (Example) An example of the present invention will be described in detail with reference to the drawings.

Figure 1 shows the state in which a lead pipe is propelled underground by a small-diameter pipe propulsion machine. In the figure, 1 is a leading pipe that is propelled underground by a propulsion device I13 installed in the starting shaft 2. 2 Each time the leading pipe 1 is propelled by one length,
Another leading pipe 1 is added inside.

In addition, the front end surface of the most advanced leading pipe 1 has a tapered surface that gradually becomes smaller in diameter. The small diameter portion of the taper portion 1a is connected to the casing 4aai of the screw auger 4, and a cassock 5 is attached to the tip of the shaft portion 4b of the screw auger 4 that protrudes forward from inside the casing 4a. The front part of the leading pipe 1 is to be excavated.

On the other hand, 7 in the figure is a direction correction device, which is installed at multiple locations, for example, at 4 locations, on the inner periphery of the leading end of the leading pipe 1. The direction correction device 7 is composed of a substantially fan-shaped direction correction member 7a whose base end is pivotally connected to the leading pipe 1 by a pin 8, and a hydraulic cylinder 9 for rotating the direction correction member 7a around the pin 8. When the leading pipe 1 moves straight, the leading pipe 1 is moved through the slit 1b formed in the leading pipe 1 so that the direction correcting surface 7b of the direction correcting member 7a is flush with the outer peripheral surface of the leading pipe 1, as shown in FIG. It is immersed inside. When correcting the direction, the direction correcting member 7a is projected by the hydraulic cylinder 9 to the outside of the leading pipe 1 as shown in FIG. 3, so that the five-direction correcting surface 7b receives earth pressure.

Note that 13 in the figure indicates the reaching shaft.

Next, let me explain the effect. A propulsion device 3 installed in the starting shaft 2 propels the leading pipe i underground along a planned line. The earth and sand excavated by the cutter 5 at the tip of the leading pipe 1 is taken into the casing 4a through the taper portion 1a and then carried out rearward by the screw warger 4.

On the other hand, the direction of propulsion of the leading pipe l is set to the planned line 1 as shown in Figure 4.
0, for example, upwardly, the direction correction member 7a located at the upper part of the leading pipe 1 is rotated by the hydraulic cylinder 9 to project to the outer circumferential surface of the leading pipe 1. When the leading pipe 1 is propelled in this state, the direction correcting member 7a
The direction correction surface 7b of the leading pipe 1 receives earth pressure and generates a force F that tries to push down the tip of the leading pipe 1.
The tip of is corrected in the direction of the planned line 10.

By performing the direction correction described above each time the direction of movement of the leading pipe 1 deviates from the planned line IO, the leading pipe 1 can be propelled along the planned line 10 with high precision.

Incidentally, in the above embodiment, the substantially fan-shaped direction correction member 7a was used. A direction correction device 7 as shown in FIGS. 6 to 9 may also be used.

That is, hydraulic cylinders 9 are installed in, for example, four directions on the outer periphery of the casing 4a on the tip side of the leading pipe 1, with the tips of the piston rods 9a facing the outer periphery of the leading rod 1, and the tip surfaces of the piston rods 9a are arranged in an arc. The inner bottom surface of the cylindrical direction correction member 7d, which has become the surface 7e, is fixed, and the direction correction member 7d is made to protrude from the outer peripheral surface of the leading pipe 1 through a protrusion hole 7C opened in the outer peripheral surface of the leading pipe 1. 2 The direction of the leading pipe 1 is corrected in the same manner as in the previous embodiment, and each hydraulic cylinder 9
By opening and closing a solenoid valve (not shown) using the operation panel 1l provided on the starting shaft 2 side. Hydraulic pressure is hydraulic hose 1
It is designed to be selectively supplied via 2. Note that the retraction of the direction correction members 7a and 7d is not dependent on hydraulic pressure in any of the embodiments. This may be done using a biasing means such as a spring.

(Effects of the Invention) As described in detail above, this invention is effective when the lead pipe is being propelled underground. When the propulsion direction deviates from the planned line. By protruding the direction correction member from the outer peripheral surface of the leading pipe and receiving earth pressure during propulsion, a force is generated to correct the direction of the tip of the two leading pipes in the direction of the planned line. The direction of the lead pipe can be easily determined using a chisel.

In addition, it is a simple structure consisting of a direction correction member and a hydraulic cylinder. This is because it can be implemented at low cost and the number of hydraulic piping can be reduced if the two-direction correction member is retracted using a biasing means. This means that it can be easily installed even in small-diameter lead pipes.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 shows the overall structure of a small-diameter tube propulsion machine. Figure 2 is an enlarged sectional view of the direction correction device. Figures 3 to 5 are explanatory diagrams of the same action. FIG. 6 is a sectional view showing another embodiment of the direction correction device, and FIG.
Figure 8 is a cross-sectional view along the line ■-■, and a diagram explaining the same effect. 9th
The figure is a sectional view taken along line D (-IX) in Figure 8. 1... Leading pipe, 2... Starting shaft 3...
・Propulsion device, 7a...direction correction member 8・
...Pin, 9...Hydraulic cylinder, Fig. 6 Fig. 7 Mouth Fig. 8 Fig. 9

Claims (4)

[Claims] (1) In a small-diameter pipe propulsion machine that propels a leading pipe 1 underground by a propulsion device 3 installed in a starting shaft 2, a hydraulic cylinder 9 is used to adjust the direction of the leading pipe 1 so that it can freely appear and retract from the outer periphery of the tip. A direction correction device for a small-diameter pipe propulsion machine, which includes a plurality of members 7a. (2) By pivotally attaching the proximal end of the direction correction member 7a to the leading pipe 1 with a pin 8 and rotating it with a hydraulic cylinder 9 about this pin 8, the direction correcting member is attached from the outer periphery of the leading pipe 1. The direction correction device according to claim (1), wherein the direction correction device 7a is made to appear and disappear. (3) Claim (1) in which the direction adjusting member 7a can be freely retracted and retracted by a hydraulic cylinder 9 installed in the radial direction of the leading pipe 1.
) Direction correction device as described. (4) The direction correction device according to claim (1), wherein the direction correction member 7a is retracted by a biasing means.