JPH0657986U - Propellant - Google Patents

Abstract

(57) [Summary] [Purpose] As the propulsion pipe expands and contracts, the internal cable is made difficult to knot. [Structure] A plurality of propulsion pipes 2 among cables 19 installed over a plurality of propulsion pipes 2 for transmitting a propulsive force to the propulsion drive head 5 after the propulsion drive head 5 for propelling in the ground
The cable portion 19a in the propulsion pipe 2a provided with the expansion / contraction mechanism D capable of expanding and contracting in the direction of the pipe axis P provided on at least a part of the cable is formed to be longer than the length of the extended propulsion pipe 2a. A contraction urging means T for urging contraction along the tube axis P direction is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 According to the present invention, a plurality of propulsion pipes for transmitting a propulsive force are connected to the propulsion drive head in succession to a propulsion drive head for propelling in the ground, and at least a part of the plurality of propulsion pipes extends in the axial direction of the pipe axis. The present invention relates to a propelling body in which a flexible telescopic mechanism is provided, and a cable is internally installed over the plurality of propulsion pipes.

[0002]

[Prior art]

 Conventionally, as a propellant of this type, the cable portion inside the propulsion pipe in which the expansion mechanism is provided corresponds to the change in length due to the expansion and contraction of the propulsion pipe among the cables installed over the plurality of propulsion pipes. I was in a slack state so that I could do it.

[0003]

[Problems to be solved by the device]

 According to the conventional propulsion body described above, the cable inside the propulsion tube is slackened by the contraction of the propulsion tube at both ends, and meanders in the contracted propulsion tube. As the propulsion pipe expands, both ends separate from each other and return to their original state. During the propulsion work, the expansion and contraction motion of the propulsion pipe is repeatedly performed, so that the cable also sags and returns in the propulsion pipe.

However, in the propulsion pipe, in addition to the cable, for example, a plurality of fluid pipes for driving the propulsion drive head and the like are also incorporated. Therefore, when the propulsion pipe expands and contracts, it is the same as the cable. If other fluid pipes also slacken or return in the propulsion pipe, and the cable and the fluid pipes become entangled during repeated expansion and contraction of the propulsion pipe, it tends to become entangled and the entanglement cannot be solved. However, when the propulsion pipe is extended again, a tensile force acts on the entangled cable or fluid pipe, and the cable having low strength is cut off.

If the cable is cut during the propulsion work, an extra step for exchanging the cable is required, and the loss time increases as a whole of the propulsion work, which significantly delays the planned process.

Therefore, an object of the present invention is to solve the above-mentioned problems and provide a propulsion body in which an internally installed cable is difficult to be entangled with the expansion and contraction of the propulsion pipe by the expansion and contraction mechanism.

[0007]

[Means for Solving the Problems]

 To achieve this object, the propulsion body according to the present invention is characterized in that a propulsion drive head propelled in the ground is followed by a propulsion drive head for transmitting a propulsive force to the propulsion drive head. A cable portion in the propulsion pipe, which is provided in at least a part of the plurality of propulsion pipes and is capable of expanding and contracting in the axial direction of the pipe axis, is formed to be longer than the length of the extended propulsion pipe, There is provided a contraction urging means for contracting and urging the cable portion along the tube axis direction.

[0008]

[Action]

 According to the characteristic structure of the propulsion body in the present invention, among the cables installed over a plurality of propulsion tubes, the cable portion in the propulsion tube provided with the expansion and contraction mechanism is formed to have a length equal to or larger than the length of the extended propulsion tube. Therefore, it is possible to prevent the cable from being torn off due to insufficient length as the propulsion pipe extends.

Further, since the contraction urging means for urging the cable portion in the propulsion pipe provided with the expansion and contraction mechanism in the axial direction of the pipe is contracted, the cable is contracted as the propulsion pipe is contracted. With the contraction urging means, both ends can be brought close to each other in a state without slack, and the cable does not always sag during repeated propulsion tube expansion / contraction movements, so it is hard to be entangled in the propulsion tube. It is possible to prevent the cable from being cut off due to the knot.

[0010]

[Effect of device]

 Therefore, according to the propulsion body of the present invention, the slack of the cable due to the expansion and contraction of the propulsion pipe can be eliminated, so that the cable can be prevented from being entangled and broken in the propulsion pipe, and the cost due to loss work such as cable replacement is lost. It is possible to control the implementation process according to the planned process while suppressing the increase.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 shows a propulsion facility S for a propulsion method using a propulsion body 1 according to an embodiment of the present invention. The propulsion equipment S for the propulsion method is fed from a horizontal take-up drum 3 in which a plurality of bendable propulsion pipes 2 that are bendably connected via a ball joint J are housed, and the take-up drum 3. The propulsion device 4 is configured to hold and push the propulsion pipe 2 to propel it into the soil. Further, the propulsion body 1 is configured by connecting a propulsion drive head 5 to the tip of the propulsion pipe 2 group.

The take-up drum 3 and the propulsion device 4 are each provided with a crawler 6, and the crawler 6 of the take-up drum 3 rotates the tip portion of the propulsion drive head 5. The first hydraulic unit 7 for expanding and contracting and driving the expansion / contraction mechanism D mounted on the propulsion pipe 2 to be described later and the lubricant for reducing the friction between the first hydraulic unit 7 and the soil accompanying the propulsion of the propulsion body 1 are stirred and transferred. And a possible sliding unit 8 is mounted.

The crawler 6 of the propulsion device 4 is equipped with a second hydraulic unit 9 for driving the propelling body 1 by the propulsion device 4 so that the propelling body 1 is gripped and retracted, and the winding drum 3 is paid out. Alternatively, a centralized operation panel 12 including a winding operation device 10 for performing a winding operation and a propulsion operation device 11 for driving and operating the propulsion device 4 is mounted.

A cable 13 electrically connecting the drive portion of the winding drum 3 and the centralized operation panel 12 between the crawlers 6 and the propelling body 1 unwound from the winding drum 3. Are arranged in a stretched state.

Explaining the propulsion device 4, a sandwiching portion 14 capable of sandwiching the propulsion body 1 is provided, and the sandwiching portion 14 is moved back and forth along the longitudinal direction of the propulsion pipe 2 sandwiched by the sandwiching portion 14. A propulsion unit main body 15 is provided freely, and a hydraulically driven direction adjusting mechanism 16 capable of adjusting the direction of the propulsion unit main body 15 is provided, and the propulsion pipe 2 clamped by the clamping unit 14 is aligned with its axis P. The tube supporting and guiding mechanism 17 that is guided in the proximity direction while supporting the following propelling tube 2 is integrally attached to the rear side of the propulsion machine main body 15, and the propeller main body 15 and the tube supporting and guiding mechanism 17 are connected. A working space X is provided between the two propulsion pipes 2, 2 so that they can be joined together. Therefore, the propelling body 2 can be propelled in the ground through the guide pipe G provided in the ground by sandwiching the propulsion pipe 2 by the sandwiching portion 14 and moving the propulsion device main body 15 forward.

The propelling body 1 will be described. As shown in FIGS. 1 and 2, at the tip of a plurality of propulsion pipes 2 which are continuously connected to each other via a ball joint J 1 so as to be bendable in the longitudinal direction, for drilling an underground hole. The propulsion drive head 5 is provided, and a hose group 18 extending over the plurality of propulsion tubes 2 and a measurement cable 19 which is an example of a cable are internally provided in the inner space.

Further, the propulsion tube 2a immediately following the propulsion drive head 5 is provided with a first expansion / contraction mechanism D, which is an example of an expansion / contraction mechanism that is expandable / contractible in the tube axis P direction. A second extension mechanism N (see FIG. 2) that extends and contracts together with the propulsion pipe 2a is attached to a part of the hose group 18.

The hose group 18 includes two hydraulic hoses 18 a and 18 b (see FIG. 1) for driving the expansion and contraction for driving the first expansion and contraction mechanism D of the propulsion pipe 2 a, and a tip of the propulsion drive head 5. It is composed of two hydraulic hoses 18c and 18d for rotation (see FIG. 2) for rotation.

The propulsion pipe 2a immediately following the propulsion drive head 5 is a piston body 21 connected to the rear propulsion pipe 2b, and is retractable in the pipe axis P direction while being fitted onto the piston body 21. The outer ring body 20 is provided, and an O-ring R for maintaining a close contact with the other side is provided on one side of the fitting surfaces of each other.

The outer cylindrical body 20 has a first partition wall portion 20a that divides an inner space of the outer cylindrical body into front and rear portions, and the first partition wall portion 20a in a state in which an inner flow path penetrates the partition wall portion 20a along the axis P direction. A pair of first cylindrical portions 20b fixed to the partition wall portion 20a and a first through hole 20c for penetrating the measurement cable 19 in the first partition wall portion 20a along the axis P direction are provided. There is.

The piston body 21 has a second partition wall portion 21a that closes the front end portion, and a pair of the first cylinder portions 20b that are provided on the second partition wall portion 21a and are located in the pipe axis P direction. A pair of second through-holes 21b slidably fitted into the second partition wall 21a and an internal space that penetrates the second partition wall 21a along the axis P direction are fixed to the second partition wall 21a. A second tube portion 21c is provided in the first through hole 20c so as to be slidably fitted in the tube axis P direction.

Further, between the outer cylinder body 20 and the piston body 21, a first pressure chamber 22 and a second pressure chamber 23 for driving them to expand and contract by receiving the hydraulic pressure of the drive oil that has passed through the hydraulic hoses 18a, 18b. Has been formed. One side 18a of the expansion / contraction driving hydraulic hose is connected to the first pressure chamber 22, and the other side 18b of the expansion / contraction driving hydraulic hose is connected to the second pressure chamber 23 in a state in which the flow paths communicate with each other. By supplying pressure oil to the first pressure chamber 22 through the one hydraulic hose 18a, the pressure acts on the rear end face of the first partition wall portion 20a of the outer cylindrical body 20, and the piston body 21 On the other hand, the outer tubular body 20 can be made to project to the front side, and the propulsion tube 2a can be extended. On the contrary, by supplying pressure oil to the second pressure chamber 23 through the other hydraulic hose 18b, the propulsion pipe 2a can be contracted. With the expansion and contraction of the propulsion pipe 2a described above, the first tubular portion 20b slides in the second through hole 21b, so that the flow paths of the two hydraulic hoses 18c and 18d for rotational drive also expand and contract. can do.

The first expansion / contraction mechanism D is configured by the outer cylinder body 20, the piston body 21, the hydraulic hoses 18 a and 18 b for expansion and contraction driving, and the pressure chambers 22 and 23. The second expansion / contraction mechanism N is configured by the second through hole 21b and the first tubular portion 20b.

Further, the measurement cable 19 is inserted into the second tubular portion 21c of the piston body 21 from the rear side to the front side of the propulsion pipe 2a, and the measurement cable 19 is positioned inside the propulsion pipe 2a. The length of the cable portion 19a is equal to or longer than the length of the extended propulsion pipe 2a, and a part of the cable portion 19a contracts and urges the cable portion 19a along the axis P direction. A contraction urging means T is provided.

As shown in FIG. 1A, the measuring cable 19 is composed of a metal core portion 19b for transmitting an electric signal and a coating portion 19c for coating the core portion 19b. The inner cylindrical portion of the outer cylindrical body 20 in front of the first partition wall is wound in a coil shape and is arranged in a loosely fitted state on the rotary drive hydraulic hoses 18c and 18d. The covering portion 19c is made of a resin having elasticity, and is configured so that the measuring cable 19 can be contracted and urged along the tube axis P direction. In the present embodiment, the covering portion 19c constitutes the contraction urging means T.

According to the propulsion body of the present embodiment, the measuring cable 19 installed in the propulsion tube 2a is always subjected to the contraction urging force of the contraction urging means T, so that the measurement cable 19 sags inside the propulsion tube 2a. In this state, the expansion and contraction of the propulsion pipe 2a can be followed.

[Other Embodiment] Another embodiment will be described below.

<1> The second expansion mechanism N is limited to the configuration including the first cylindrical portion 20b of the outer cylindrical body 20 and the second through hole 21b of the piston body 21 described in the previous embodiment. For example, a part of the hose group 18 is provided with an inner pipe part and an outer pipe part which are slidable along the pipe axis P, and the hose 18 itself is expandable and contractible, for example. It may be formed into a shape. Including these, it is collectively called the second expansion mechanism.

<2> The propulsion body 1 is not limited to the hose group 18 to be installed therein as described in the previous embodiment, and, for example, a lubricant capable of reducing the peripheral friction of the propulsion body 1 is distributed. It may be a lubricating material distribution pipe or the like, and the number thereof is not limited to one or plural. These are collectively called the hose group. Further, the cable 19 installed in the propulsion body 1 is not limited to the measurement cable described in the above embodiment, and may be another cable, and the cables are collectively referred to as a cable. To do.

<3> The contraction urging means T is not limited to the elastic cover 19c made of resin and formed in the coil shape described in the previous embodiment. For example, the contraction urging means T is a separate member from the cable 19. A body or the like may be attached to the cable portion 19a.

In the claims for utility model registration, reference numerals are given for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a propellant body according to an embodiment.

FIG. 2 is a vertical cross-sectional view showing a propellant body according to an embodiment.

FIG. 3 is a side view showing the propulsion equipment of the embodiment.

[Explanation of symbols]

 2 Propulsion pipe 2a (Propulsion pipe is provided) Propulsion pipe 5 Propulsion drive head 19 Cable 19a Cable part D Expansion / contraction mechanism P Pipe axis core (of propulsion pipe) T Shrinkage biasing means

Claims (1)

[Scope of utility model registration request] 1. A propulsion drive head (5) for propelling in the ground.
After that, a plurality of propulsion pipes (2) for transmitting a propulsive force are continuously provided to the propulsion drive head (5), and at least a part of the plurality of propulsion pipes (2) is in a pipe axis (P) direction. A propulsion body (2a) provided with a telescopic mechanism (D) capable of expanding and contracting, and a cable (19) installed inside the plurality of propulsion tubes (2). ), The cable portion (19a) in the extension of the propulsion pipe (2a)
A propulsion body which is formed to have a length equal to or more than the length and is provided with contraction urging means (T) for urging the cable portion (19a) to contract along the tube axis (P) direction.