JPH0649666Y2 - Tube propulsion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a pipe propulsion device suitable as an original pushing device for a pipe propulsion method, and more particularly to a multistage jack driven by a working fluid such as hydraulic oil. Regarding the tube propulsion device.

(Prior Art) As one of the pipe propulsion devices used in the pipe propulsion method, at least a pair of jacks arranged in parallel in a horizontal direction at intervals, and moved by moving each jack in the axial direction of the jack. There is a device including a moving body that applies thrust to the pipe to be driven. In this pipe propulsion device, the reaction bodies are connected to the rear ends of the piston rods of both jacks, and the cylinders of both jacks are connected to the moving body. The pipe to be propelled is arranged in front of the moving body and at a corresponding portion between the jacks.

(Problems to be solved) However, in this pipe propulsion device, the forward force, that is, the thrust force by both jacks acts on the portions of the moving body that are horizontally spaced, while the reaction force by the pipe to be propelled is It acts between both parts. These forces act on the moving body as a force that deforms the moving body such that the surface of the moving body on the tube side becomes concave, so that the moving body is curved so as to compress the pipe in the diameter direction thereof. . This results in deformation of the pipe, which can lead to cracking or destruction of the pipe, especially in the case of concrete pipes.

In order to solve such a problem, it is conceivable to make the moving body a rigid body. However, in this case, the size of the moving body becomes large, so that a jack for generating a large amount of thrust is required, and the size of the entire device becomes large.

An object of the present invention is to provide a pipe propulsion device that does not damage a pipe without using a moving body as a rigid body.

(Means for Solving the Problems, Actions and Effects of the Invention) A device for propelling a pipe according to the present invention includes at least a pair of jacks arranged in parallel in a horizontal direction and a thrust force from each jack is horizontal. A moving body which is received by a first portion spaced apart in the direction and is moved in the axial direction of the jack, and which gives a thrust to the pipe at a second portion between the first portions; A cushioning material arranged on a surface of the moving body on the side where the pipe is arranged so as to receive the rear end face of the pipe.

When propelling the pipe, the thrust of the jack acts on the moving body at the first portion of the moving body which is horizontally spaced, whereas the reaction force of the pipe acts on the moving body at the second portion between the first portions. Act on the site. Thereby, the moving body is curved such that the surface of the moving body on the tube side is a concave surface. However, since the cushion material is deformed by the deformation of the moving body, a part of the force that compresses the pipe in the diametrical direction thereof is absorbed by the deformation of the cushion material. Therefore, according to the present invention, a large force that breaks the pipe does not act on the pipe.

If plywood is used as the cushioning material, the shape of the cushioning material can be easily processed according to the shape of the end surface of the pipe to be propelled, and thus the device can be easily and inexpensively propelled for other pipes having different diameters. Can be diverted to.

The jack includes a rod having a first connecting portion connected to a reaction body at a rear end portion thereof, a rod around the rod, coaxial with a radial direction of the rod, and relatively in an axial direction of the jack. A plurality of movably arranged cylinders, the innermost arranged cylinder movably receiving the rod from the tip end side thereof in the direction of the jack axis, and the outermost arranged cylinder. The cylinder includes a second connecting portion connected to a horizontal end of the moving body, and when the first and second connecting portions are closest to each other, the cylinder arranged on the innermost side has the direction of the axis line. It is preferable to use a jack projecting forward from the position of the moving body in.

When the above jack is extended, the rod and the innermost cylinder are moved relative to each other so that the rod projects rearward from the innermost cylinder, and both adjacent cylinders are placed inside. The cylinder is moved relative to the cylinder arranged outside the cylinder so as to move in the same direction as the rod.

On the other hand, when the jack is contracted, the rod and the innermost cylinder are moved relative to each other so that the rod is housed in the innermost cylinder. Is relatively moved so that the cylinder arranged inside of the cylinder projects forward from the cylinder arranged outside thereof.

When the jack having the above structure is used, when the first and second connecting parts are closest to each other, the cylinder arranged on the innermost side allows the position of the movable body in the direction of the axis of the rod and thus the second connecting Since it protrudes from the position of the part to the side opposite to the first connecting part, even if the stroke due to the relative movement of the adjacent cylinders is shortened, the relative distance between the rod and the innermost cylinder It is possible to lengthen the stroke due to various movements, and because the cylinder arranged inside protrudes from the position of the moving body,
The distance between the first and second connecting portions becomes shorter. For this reason, the portion of the cylinder projecting forward from the position of the moving body can be arranged at a site separated in the horizontal direction of the space required for arranging the pipes, and thus a large vertical shaft is not required.

One cylinder, other than the outermost arranged cylinder, is arranged around the outermost arranged cylinder and the first cylinder part which receives the rod or the cylinder arranged inside of this, and the outermost arranged cylinder. And a second cylinder portion connected to the first cylinder portion for receiving the cylinder from the rear end side thereof. With this configuration, the jack can be prevented from bending by movably supporting the second cylinder portion on the base.

(Embodiment) A pipe propulsion device 10 shown in FIGS. 1 to 3 includes a plurality of pairs of jacks 12 arranged in parallel at a distance in the horizontal direction, and the jacks 12 simultaneously move in the axial direction of the jack 12. A push plate or moving body 14 to be moved, a base 16 for receiving the moving body 14 so that the moving pair 14 can move in the direction of the axis, and fixed to the rear end of the base 16. As shown in FIG. 4, one of the jacks 12 including the reaction body 18 includes a rod 20, a cylinder 22 for movably receiving the rod in the axial direction thereof, and the cylinder 22. And a cylinder 24 disposed so as to be relatively movable around the cylinder in the direction of the axis of the cylinder.

The rod 20 is installed in the cylinder chamber 26 of the inner cylinder 22.
It is inserted from the tip end side of 20 and constitutes a first jack part together with the cylinder 22. For this reason, a piston or flange 28 that divides the cylinder chamber 26 into two chambers 26a and 26b is provided at the tip of the rod 22. On the other hand, a connecting portion 20 connected to the reaction force body 18 is attached to the rear end portion of the rod 20 by welding or bolts.
The rod 20 has a channel 32a for supplying a working fluid such as a working oil for moving the rod 20 and the cylinder 22 in the axial direction of the rod 20 to the chamber 26a, and a working fluid for supplying the working fluid to the chamber 26b. A flow path 32b is formed.

The inwardly arranged cylinder 22 comprises a first cylinder portion 34 defining a cylinder chamber 26 which opens rearward to receive the rod 20 relatively movably in the direction of its axis. An end plate 36 that hermetically closes the cylinder chamber 26 is releasably fixed to the opening of the cylinder chamber 26 by a plurality of bolts. The end plate 36 is provided with a hole 38 through which the rod 20 slidably passes.

The cylinder 22 also comprises a second cylinder part 40 which receives the cylinder 24 arranged on the outside from the rear end side thereof. The rear end portion of the second cylinder portion 40 has a rear end portion so that the second cylinder portion 40 and the cylinder 24 cooperate with each other to define the cylinder chamber 42 of the second jack portion. It is releasably fixed to the section by a plurality of bolts.

The cylinder 24 arranged on the outer side is provided with a flange-shaped piston 44 that divides the cylinder chamber 42 into two chambers 42a and 42b. On the other hand, on the outer periphery of the tip end portion of the cylinder 24, a connecting portion 46 that is connected to the moving body 14 by a bolt or the like is provided. The connecting portion 46 is a flange in the illustrated example. On the outer circumference of the second cylinder portion 40, a pair of rectangular support bodies 48, which are spaced apart in the axial direction of the rod 20, are fixed.

The working fluid that relatively moves the first and second cylinders 22 and 24 in the direction of the axis of the rod 20 is the first cylinder portion.
A channel 50b provided in the second cylinder portion 40 is supplied to the chamber 42a from the chamber 26a through a channel 50a provided in the 34.
Through the chamber 26b to the chamber 42b. The flow path 50a and the flow path 50b are in communication with the chambers 26a and 26b, respectively.

Between the rod 20 and the end plate 36, between the flange 28 of the rod 20 and the first cylinder portion 34 of the cylinder 22, the first cylinder portion
34 and the end plate 38, between the first and second cylinder parts 34 and 40 of the cylinder 22, between the second cylinder part 40 and the cylinder 24, the cylinder part 34 of the cylinder 22 and the piston of the cylinder 24. 44 and the cylinder portion 40 of the first cylinder 14.
The airtightness between the cylinder and the piston 44 of the cylinder 24 depends on the sealing material.
Maintained by 52.

The cylinder chamber 42 for the working fluid that relatively moves the cylinders 22 and 24 is provided with a jack shown in FIG.
Like 74, it may be formed by the first cylinder portion 34 and the cylinder 24. Further, the jack 12 may have three or more cylinders arranged coaxially in the radial direction of the rod 20 and relatively movable in the axial direction of the rod. in this case,
The second cylinder section 40 may be provided in one cylinder other than the outermost cylinder. In the case of a jack with three or more cylinders, the cylinder located inside is the cylinder located outside when the jack is contracted, ie when the first and second coupling parts are closest together. It is desirable to have a structure that projects further forward.

As shown in FIGS. 1 to 3, when a plurality of jacks 12 are incorporated in the pipe propulsion device 10, each jack 12 is divided into a pair of jack assemblies. Each jack assembly consists of three jacks 12 in the illustrated example. Each jack 12 of each jack assembly is supported by a support that extends parallel to each other.
48 stacked and also supported by multiple bolts
48 sites are interconnected.

Such assembling work is performed on the base 16.
Each jack 12 is connected to the reaction force body 18 by a bolt or the like at a connecting portion 30 thereof, and is connected to the moving body 14 by a bolt or the like at a connecting portion 46. Both jack assemblies are
They are arranged on the base 16 at a distance larger than the outer dimensions of the pipe 54 to be propelled.

As shown in FIG. 1, a circular hole 56 having a diameter slightly smaller than the inner diameter of the pipe 54 to be propelled is formed in the central portion of the moving body 14. On the other hand, circular holes 58 for receiving the first cylinder portion 34 of the jack 12 are formed at a plurality of positions on both sides of the hole 56 which are vertically spaced.

The base 16 includes a pair of rails 60 extending in parallel to receive the moving body 14 at its bottom and a jack 12 arranged at the bottom.
Each rail 60, 62 comprises a rail 60 and a pair of rails 62 extending parallel to receive the support 48 of
The plurality of connecting members 64 are non-displaceably connected to each other.

A sliding member 66 for smoothing the movement of the support body 48 with respect to the rail 62 is attached to a portion of the support body 48 of the jack 12 arranged at the lowermost portion, which faces the rail 62. For the same purpose, an active member (not shown) is also arranged at a portion of the moving body 14 facing the rail 60.

In addition, screw type jacks may be provided at both ends of the rails 60 and 62 in order to adjust the height position of each part of the pipe propulsion device 10.

The pipe propulsion device 10 also includes a cushion member 68 arranged on the surface of the moving body 14 on the side where the pipe 54 is arranged. Cushion material
68 is made in the shape of a substantially disc having an outer dimension larger than the outer dimension of the tube 54, and also has a circular hole 70 approximately the same size as the hole 56 of the moving body. Cushion material like this
The 68 can be made of a plate material having a certain hardness, such as plywood or a rubber plate. As the plate material for the cushion material 68, plywood having a thickness of about 12 mm is preferable because it has appropriate hardness and elasticity, is easy to process, and is inexpensive.

In the cushion material 68, the axis line of the hole 70 of the cushion material 68 is the hole 56 of the moving body 14.
Of the moving body 14 is detachably fixed to the surface of the moving body 14 on the side where the pipe 54 is disposed so as to receive the rear end face of the pipe 54.

When each jack 12 is contracted during use, as shown in FIG. 4, the entire main body of the rod 20 is housed in the cylinder chamber 26, and the front portions of the cylinders 22 and 24 of the cylinder 22 are cushion members 68. Is projected forward by a distance L from. The tube 54 to be propelled is disposed in front of the moving body 14 and between the jack assemblies so that its rear end surface faces the cushion material 68.

When the working fluid is supplied to the flow path 32a, the working fluid is supplied to the chamber 26a.
Is supplied to the chamber 42a through the flow path 50a, the cylinder 22 is moved forward by a distance L _{1 with} respect to the rod 20, and the cylinder 24 is moved forward by a distance L _{2 with} respect to the cylinder 22. Be moved. As a result, the jack 12 is L ₁ +
L _{2 is} extended and tube 54 is advanced the same distance.

When the jack 12 is extended, the moving body 14
The thrust by 12 is the first with the space between the moving bodies 14 in the horizontal direction.
Of the pipe 54, while the reaction force of the pipe 54 acts on the second portion between the first portions, that is, the portion facing the rear end surface of the pipe 54 via the cushion member 68. To work. As a result, the moving body 14 becomes a pipe of the moving body.
The surface on the 54 side is curved so as to be concave. However, since the cushion member 68 is deformed by the deformation of the moving body 14,
A part of the force that compresses the tube 54 in its diametrical direction is absorbed by the deformation of the cushion material 68. Therefore, the pipe 54 is not subjected to such a large force that it breaks.

As shown in FIG. 1, when the jack 12 is fully extended, the moving body 14 is moved to a position where the tip surface of the moving body 14 projects slightly forward from the tip of the jack 12.
Further, the support body 48 has been moved to a position between the connecting portions 30 and 46.

When the working fluid is supplied to the flow path 32b in a state where the jack 12 is extended, the working fluid is supplied to the chamber 26b and also supplied to the chamber 42b via the flow path 50b.
Is moved rearward with respect to the rod 20 by a distance L ₁ and the cylinder 24 is moved rearward with respect to the cylinder 22 by a distance L ₂ . As a result, the jack 12 is contracted as shown in FIGS. 2 to 4, and the moving body 14 is moved to a position where the first cylinder portion 34 of the cylinder 22 projects forward by the distance L from the moving body 14. .

When the jack 12 expands and contracts, the moving body 14 slides on the rail 60, and the support 48 of the jack 12 arranged at the bottom slides on the rail 62 while maintaining the position between the connecting portions 30 and 46. The jack 12 should be propelled by its own weight or
Does not bend due to the weight of 54.

According to the pipe propulsion device 10, since the pipe 54 can be arranged between the jacks 12 that are horizontally spaced from each other and between the parts in front of the moving body 14, the distance between the connecting portions 30 and 46 can be reduced. It is short and does not require large vertical shaft dimensions in the tube propulsion direction. Further, since the tip end portion of the cylinder 22 protruding forward from the position of the moving body 14 is arranged in the space required for the arrangement of the pipe 54, the stroke L ₁ due to the relative movement of the rod 20 and the cylinder 22 is increased. However, it does not require a large vertical shaft.
Therefore, even if the stroke L ₂ due to the relative movement of the cylinders 22 and 24 becomes shorter, the stroke L ₁ due to the relative movement of the rod 20 and the cylinder 22 can be lengthened accordingly.

FIG. 5 shows another embodiment of the jack 74 in which the distance between the connecting portions 30 and 46 can be shortened. jack
74 differs from jack 12 in that cylinder 22 does not include a second cylinder portion around cylinder 24. For this reason,
An end plate 76 that defines the cylinder chamber 42 of the second jack portion in cooperation with the first cylinder portion 34 of the cylinder 22 and the cylinder 24 is fixed inside the rear end portion of the cylinder 24 by a plurality of bolts. . A flange-shaped piston 44 that divides the cylinder chamber 42 into two chambers 42a and 42b is provided on the outer periphery of the cylinder 22.

In this jack 74 as well, when the working fluid is supplied to the flow path 32a in a state where the jack 12 is contracted, the cylinder 22 moves the rod 2
The cylinder 24 is moved forward by a distance L _{1 with} respect to 0, and the cylinder 24 is moved forward by a distance L _{2 with} respect to the cylinder 22. Further, when the working fluid is supplied to the flow path 32b with the jack 12 extended, the cylinder 22 is moved rearward with respect to the rod 20 by the distance L ₁ , and the cylinder 24 is moved rearward with respect to the cylinder 22. Moved a distance L ₂ .

[Brief description of drawings]

1 is a perspective view showing an embodiment of the pipe propulsion device of the present invention, in which the jack is extended, and FIG. 2 is the pipe propulsion device in FIG. 1 when the jack is contracted. A front view, FIG. 3 is a plan view of the pipe propulsion device of FIG. 1 when the jack is contracted, and FIG. 4 is a cross-sectional view showing an embodiment of the jack used in the pipe propulsion device of FIG. The drawing is a sectional view showing another embodiment of the jack. 10: Pipe propulsion device, 12, 74: Jack, 14: Moving body, 20: Rod, 22, 24: Cylinder, 30, 46: Connection part, 34: First cylinder part, 40: Second cylinder part, 54: pipe, 68: cushion material.

Claims (4)

[Scope of utility model registration request] 1. A device for propelling a pipe, comprising at least a pair of jacks arranged in parallel at a horizontal interval, and a first thrust force from each jack which is horizontally spaced. A moving body which is received by a portion and is moved in the direction of the axis of the jack, and which gives a thrust to the pipe at a second portion between the first portions, and a rear end surface of the pipe. And a cushion material arranged on the surface of the moving body on the side where the pipe is arranged. 2. The pipe propulsion device according to claim 1, wherein the cushion material includes plywood. 3. Each of the jacks has a rod having a first connecting portion connected to a reaction force body at a rear end portion thereof, and a rod which is around the rod and is coaxial with the rod in a radial direction of the rod. A plurality of cylinders arranged relatively movably in a direction, the innermost cylinder being arranged to receive the rod relatively movably in the direction of the axis from the side of its tip. The outer cylinder is provided with a second connecting portion connected to the horizontal end of the moving body, and the innermost cylinder is provided with the first and second connecting portions being closest to each other. The pipe propulsion device according to claim (1) or (2), wherein the pipe propulsion device protrudes forward from the position of the movable body in the direction of the axis when moving. 4. One cylinder, other than the outermost arranged cylinder, has a first cylinder portion for receiving a rod or a cylinder arranged therein, and a cylinder arranged around the outermost arranged cylinder. Said first outermost cylinder being received from the rear end side thereof,
The pipe propulsion device according to claim 3, further comprising a second cylinder part connected to the cylinder part.