JPH0730794Y2 - Underground propellant - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground propulsion body used for forming a preceding hole in a pipe burying work.

[0002]

2. Description of the Related Art Steel pipes such as sewer pipes, gas pipes, cable insertion pipes, and concrete fume pipes are press-fitted as underground pipes by sequentially connecting them from the starting shaft side wall to the ground without excavating the ground surface. In this case, when the preceding hole is formed, the geological condition can be known, an appropriate position can be secured, and the buried pipe can be easily press-fitted.

In order to form the preceding hole, there is a method of press-fitting a cylindrical underground propulsion body with an extrusion jack of a starting base installed in a starting shaft.

FIG. 3 is a perspective view showing an example of a small underground propulsion device invented by the present inventor, which comprises a combination of a starting base 1, a partition plate 2 and a cylindrical underground propulsion body 3. The starting base 1 is installed in the starting shaft, and the pushing jack 5 is provided horizontally on the guide frame 4 and the guiding frame 4 is provided.
A reaction force wall 6 is provided at the rear part. Further, a cross section in which the outer side of the jack 5 is covered with a cylindrical holder 7 and engagement grooves 9a to 9d extending in the circumferential direction on the inner peripheral surface between the holders 7 are formed in parallel with each other at intervals in the front-rear direction. U-shaped extrusion cradle 8
Installed.

The partition plate 2 is a semi-circular plate provided with a substantially semi-circular cutout 10 at the center of the upper end to form a semi-ring plate shape, and handles 11 provided on the left and right of the upper end. 9a-9d
The end portion is fitted to and is removably accommodated in the push receiving base 8.

The cylindrical submerged propelling body 3 is provided with a notch plate 12 at the front end surface and a resistance plate 14 at the upper end of the front end, and its outer periphery is attached to and detached from the notch 10 of the partition plate 2 at the rear end. A support 13 that fits freely is connected. In addition, this support body 13 and the underground propulsion body 3
The connection relationship with and may be either screwing or fitting, but it should be such that they can be easily separated. In the figure, 13a is a locking rib which prevents the support 13 from moving back and forth from the notch 10 on the outer periphery of the support 13.

In this way, the partition plate 2 is set in the rearmost engaging groove 9a of the push-out pedestal 8 of the starting base 1, the support 13 is fitted into the partition plate 2, and the support 13 is attached. The ground plate 3 is supported horizontally by the partition plate 2 via the partition wall plate 2. Underground propellant 3
Has its tip portion projected from the front end of the push receiving pedestal 8.

When the pushing jack 5 is extended by one stroke, the pushing pedestal 8 moves forward, and the ground propelling body 3 is pressed into the ground through the side wall of the starting shaft. Next, the support 13 of the underground propelling body 3 is separated from the main body, the pushing jack 5 is reduced while leaving the underground propelling body 3, and the partition plate 2 and the pushing cradle 8 are retracted. In this case, the support 13 is also retracted together with the partition plate 2. The support 13 is removed from the partition plate 2, the partition plate 2 is set in the engaging groove 9b again, and the support 13 is fitted to the partition plate 2 to connect the support 13 and the underground propelling body 3 to each other. Then, the pushing jack 5 is extended again, and the press-fitting of the underground propelling body 3 is repeated.

Similarly, the submerged propelling body 3 is press-fitted while the partition plate 2 is sequentially moved to the engaging groove 9c at the front portion of the push receiving base 8. Then, when the partition plate 2 has moved to the frontmost engagement groove 9d of the push-out pedestal 8, a second piece is added to the rear end of the underground propelling body 3 to push the partition plate 2 into the push-out pedestal 8 Is reset in the engaging groove 9a at the rearmost portion, and the same process is repeated. In this manner, the press-fitting proceeds while successively adding the underground propelling body 3 to reach the tip of the reaching hole.

[0010]

As described above, in the pipe burying propulsion device, the underground propulsion body 3 has a head portion projecting a notch plate 12 and a floating resistance plate 14 with respect to a rear main body portion. It is desirable that the head portion and the main body portion rotate integrally with each other in the circumferential direction. Resistor plate 14
With this, it is easy to move in the opposite direction due to resistance during ground propulsion, and the bend is corrected. For example, the resistance plate 14 facing upward as shown in FIG. 3 corrects the direction downward, and if the resistance plate 14 faces downward, the direction is corrected upward. As described above, by making the head part rotatable or by making both the head part and the main body part rotatable, it is possible to make corrections in all the directions of up, down, left and right.

As a head rotating mechanism for this purpose, a rotating device such as a motor or a gear cannot be provided inside the underground propulsion body 3 when the diameter of the underground propulsion body 3 itself is small.
It is also conceivable that a rotary shaft penetrating the main body is coupled to the head, and this rotary shaft is projected rearward of the main body to operate it, but the underground propulsion body 3 is sequentially connected and long. However, it is necessary to lengthen the rotary shaft in accordance with that of the rotating shaft, which complicates the mechanism. The same applies to the case where both the head portion and the main body portion are rotatable,
Rotation of the entire length of the underground propulsion body 3 causes a great frictional resistance with the ground and causes considerable difficulty.

The object of the present invention is to eliminate the disadvantages of the above-mentioned conventional example, and to enable the head part to rotate with respect to the main body in a ground propelling body having a small diameter, the turning mechanism thereof is ground driven. An object of the present invention is to provide an underground propulsion body that can be compactly housed in a body part and that can be easily and reliably rotated.

[0013]

In order to achieve the above-mentioned object, the present invention provides a ground propelling body which is pushed into the ground by pushing from the rear end with an extruding jack and is provided with a notch plate at the tip in the excavation direction, It is divided into a head part with a resistance plate protruding at the tip of the direction and a main body part behind it, and a shaft extending backward from the head part is inserted into the main body part, and a part of this shaft is formed in the screw part and inside the main body part A nut pipe movably accommodated in the screw part is fitted to the screw part, and a piston that moves back and forth along the outer periphery of the non-screw part of the shaft with the main body part as a cylinder is coupled to the nut pipe, and The gist of the main body is that the nut tube is moved without rotating with respect to the main body by coupling the key and the key groove in the length direction.

[0014]

According to the present invention, when the piston is moved back and forth by hydraulic operation, the nut pipe is also moved back and forth together with the piston. However, this nut pipe is formed by connecting the key and the key groove in the longitudinal direction with the main body. Therefore, it moves without rotating with respect to the main body. Then, the nut tube is screwed into the threaded portion of the shaft to move back and forth, thereby giving a rotational force to the shaft, and the shaft rotates to rotate the head portion.

The nut tube and the screw portion may be engaged with each other only by rotating the head portion once, and by slowly rotating the head portion, the position of the resistance plate projecting in the circumferential direction of the head portion may be increased. Also changes slowly by 360 °. When the ground propellant propels the ground, if the resistance plate is facing upward, the resistance is large above the resistance plate, and the progress of the ground propulsion unit can be corrected to the downward direction. Similarly, if the resistance plate faces downward, the direction can be corrected in the upward direction, and by rotating the head portion, the correction can be performed in all the directions of up, down, left and right.

Since the notch plate provided at the tip of the head portion in the excavation direction is located at the beginning in the excavation direction of the ground propelling body, the head portion propelled against the ground is sharply cut to form the head portion of the head portion. Promoting promotion.

Further, since the nut pipe and the main body portion are connected by the combination of the key and the key groove in the length direction, the nut pipe can be moved without rotating with respect to the main body portion. As a result, a strong rotational force is obtained by applying a rotational force only to the head portion that is most loaded for propulsion, and the head portion is pressed from the rear side to have a considerable propulsive force. On the other hand, although the head portion is likely to break down due to the load of excavation, as described above, since the head portion and the main body portion can be separated, only this head portion needs to be replaced, which is not wasteful.

[0018]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a vertical sectional side view showing an embodiment of an underground propulsion body of the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. Reference numeral 3 in the figure denotes a cylindrical underground propellant, which is set on the starting base 1 as described in FIG.
It is extruded by and pressed into the ground.

In the present invention, the underground propelling body 3 is divided into a head portion 15 having a notch plate 12 and a resistance plate 14 protruding therefrom and a main body portion 16 behind the head portion 15. Then, an end portion is coupled to the back surface of the head portion 15 and a shaft 17 extending rearward from the head portion 15 is inserted into the main body portion 16.

A part (the first half in the figure) of the shaft 17 is formed into a screw portion 18 having a gentle screw thread formed on the outer periphery,
The other (the latter half in the figure) is the non-screw portion 19. Also, the screw part 18 is housed inside the body part 16 so as to be movable in the length direction.
The nut pipe 20 has almost the same length as that of the nut pipe 20 and has a screw groove corresponding to the screw thread on the outer periphery of the screw portion 18 formed on the inner peripheral surface.
Is fitted to the outside of the screw portion 18.

The body portion 16 is formed with a rear half portion as a cylinder 21, and a piston 22 that moves back and forth along the outer periphery of the non-threaded portion 19 of the shaft 17 passing through this cylinder 21 is used as a cylinder.
The piston 22 is arranged inside the pipe 21, and the piston 22 is connected to the nut pipe 20. In the figure, 23a and 23b are hydraulic ports for sending oil to the cylinder 21.

As shown in FIG. 2, the nut pipe 20 and the main body portion 16 are combined by a combination of a key 24 and a key groove 25 in the longitudinal direction, and the nut pipe 20 is rotated with respect to the main body portion 16. I tried to move without moving.

Next, usage and operation will be described. By injecting and discharging the oil into the cylinder 21 through the hydraulic ports 23a and 23b, the piston 22 moves back and forth, and the nut pipe 20 also moves back and forth.

Since the nut pipe 20 is a combination of the key 24 and the key groove 25 in the lengthwise direction with the main body 16, it moves back and forth without rotating with respect to the main body 16. Then, the nut tube 20 is screwed into the threaded portion 18 of the shaft 17 and moves back and forth to give a rotational force to the shaft 17, and the shaft 17 rotates to rotate the head unit 15.

The nut tube 20 and the threaded portion 18 may be engaged with each other only by rotating the head portion 15 once, and by rotating the head portion 15 slowly, the position of the resistance plate 14 is also 360.
° change. When the ground propelling body 3 propels the ground, if the resistance plate 14 is facing upward, the resistance plate 14 has a large resistance above and the traveling direction of the ground propelling body 3 should be corrected downward. You can Similarly, if the resistance plate 14 is facing downward, the direction can be corrected upward, and by rotating the head portion 15, correction can be performed in all directions up and down and left and right.

The hydraulic hoses connected to the hydraulic ports 23a and 23b can be arranged in a space-saving manner by passing the inside of the rear connecting body of the underground propulsion body 3, and the length of the underground propulsion body 3 can be increased. You can easily lengthen it accordingly.

[0027]

As described above, in the underground propulsion body of the present invention, the head part is rotatable with respect to the main body part in the underground propulsion body which is pushed into the ground by pushing from the rear end with the pushing jack. However, the rotating mechanism can be compactly housed in the main body of the underground propulsion body, and the entire underground propulsion body can be small and small in diameter. Further, the head portion can be easily and surely rotated and easily handled.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of an underground propulsion body of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a perspective view of a small underground propulsion apparatus using the underground propulsion body of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Starting base 2 ... Partition plate 3 ... Underground propellant 4 ... Guide frame 5 ... Extrusion jack 5a ... Cylinder 5b ... Rod 6 ... Reaction force wall 7 ... Holder 8 ... Extrusion cradle 9a-9d ... Engagement groove 10 ... Notch 11 ... Handle 12 ... Notch plate 13 ... Support 13a ... Locking rib 14 ... Resistor plate 15 ... Head part 16 ... Body part 17 ... Shaft 18 ... Screw part 19 ... Non-screw part 20 ... Nut pipe 21 ... Cylinder 22 ... Piston 23a, 23b ... Hydraulic port 24 ... Key 25 ... Keyway

Claims (1)

[Scope of utility model registration request] 1. A submerged propelling body which is pushed into the ground by pushing from the rear end with an extruding jack, has a notch plate at the tip in the excavation direction and a resistance plate at the tip in the circumferential direction. The main body part is divided into two parts, and a shaft extending rearward from the head part is inserted into the main body part. A part of this shaft is formed in the screw part and a nut pipe movably accommodated in the main body part is fitted into the screw part. , A piston that moves back and forth along the outer circumference of the non-threaded portion of the shaft with the main body as a cylinder is coupled to the nut pipe, and the nut pipe and the main body are formed of a key and a key groove in the longitudinal direction. The underground propulsion body characterized in that the nut tube is moved without rotating with respect to the main body part when coupled.