JPH01111996A - Pipe propulsive device - Google Patents

Abstract

PURPOSE: To eliminate the need for large vertical piles and prevent deflection of jacks by placing a forwardly projecting part in the space required for the layout of pipes, and causing an outer cylinder part to be movably received on a base. CONSTITUTION: A moving element 14 is pressed by plural rows of multi-stage jacks 12 arranged in horizontally spaced, parallel relationship to one another. The rear end of the moving element 14, together with an outer cylinder, is axially movably received by a base 16 secured to a reaction body 18. Each multi-stage jack 12 has a respective inner cylinder 22 projected from the position of the moving element 14 to the opposite side, with the stroke of each jack 12 shortened by the relative movements of adjacent cylinders 24. Therefore, the part of each cylinder 22 projected forward of the position of the moving element 14 can be stored in the space required for pipe layout.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a pipe propulsion device suitable as a main pushing device for a pipe propulsion method, and in particular to a pipe propulsion device using a multi-stage jack driven by a pressure fluid such as hydraulic oil. Regarding equipment.

(Prior art) As one of the main push jacks used in the pipe propulsion method,
a rod having a first connecting portion connected to one of the reaction force body and the pressed body at its rear end; and a rod located around the rod coaxially in the radial direction of the rod and in the axial direction of the rod. a plurality of cylinders arranged so as to be relatively movable, and a second connecting part connected to the other of the reaction force body and the pressed body is provided at the tip of the outermost cylinder. There is a sense of jealousy.

However, the conventional jack has a structure in which most of the inner cylinders among the adjacent cylinders are accommodated in the outer cylinder when the jack is contracted. said first and second
The distance between the connecting parts is long. In a tube propulsion device using such a jack, the length of the shaft in which it is installed must be increased in the tube propulsion direction. Moreover, when the stroke of the conventional jack is large, the deflection due to its own weight is large.

(Object of the Invention) An object of the present invention is to provide a pipe propulsion device that does not require increasing the length of the shaft in the direction of pipe propulsion and can prevent the jack from deflecting. .

(Structure of the Invention) The tube propulsion device of the present invention includes a rod having a first connecting portion connected to a reaction body at the rear end thereof, and a first connecting portion provided around the rod and coaxially in the radial direction of the rod. at least one jack including a plurality of cylinders arranged to be relatively movable in the axial direction of the rod; a moving body moved in the axial direction by the jack; and the moving body moving in the axial direction. A tube propulsion device including a base for receiving the moving body so as to be able to move, wherein the outermost cylinder is provided with a second connecting portion connected to the moving body, and the outermost cylinder is provided with a second connecting portion connected to the moving body. One cylinder other than the cylinder
a first cylinder section for receiving a rod or cylinder disposed inside the first cylinder section; and a first cylinder section for receiving a rod or cylinder disposed inside the first cylinder section; a second cylinder part coupled to the first cylinder part, the innermost cylinder being moved in the axial direction when the first and second coupling parts are closest to each other; The jack protrudes forward from the position of the body, and the jack is movably received by the base in the second cylinder portion in the axial direction.

(Operations and Effects of the Invention) When the jack extends, the innermost cylinder and the rod are moved relative to each other so that the rod protrudes rearward from the innermost cylinder, and Adjacent cylinders are moved relative to each other such that the inner cylinder moves in the same direction as the rod relative to the outer cylinder.

On the other hand, when the jack is retracted, the innermost cylinder and rod are moved relative to each other so that the rod is accommodated in the innermost cylinder, and the rod is moved inwardly. Adjacent cylinders are moved relative to each other so that the cylinder located on the outside thereof projects forward from the cylinder located outside of it.

In the jack used in the present invention, when the first connecting portion and the second connecting portion are closest to each other, the innermost cylinder changes the position of the movable body in the axial direction of the rod and thus the second connecting portion. Since the rod protrudes toward the side opposite to the first connecting portion, even if the stroke is shortened due to the relative movement of adjacent cylinders, the relative relationship between the rod and the innermost cylinder will be reduced accordingly. The stroke of the movement can be lengthened, and the distance between the first and second connecting parts is shortened because the inner cylinder protrudes from the position of the moving body.

Therefore, according to the present invention, the portion of the cylinder that projects forward from the position of the movable body can be placed in the space necessary for arranging the pipe, so a large shaft is not required. Further, since the second cylinder portion of the jack is movably received by the base, the jack is prevented from being bent.

(Example) Embodiments of the present invention shown in the drawings will be described below.

The tube propulsion device 10 shown in FIGS. 1 to 3 includes a plurality of pairs of jacks 12 arranged in parallel at intervals in the horizontal direction, and a push plate that is simultaneously moved in the axial direction by each jack 12. A movable body 14, a base 16 for receiving the movable body 14 so that the movable body 14 can move in the axial direction of the jack 12, and a reaction force body 18 fixed to the rear end of the base 16. Each jack 12, one of which is shown in FIG. The cylinder 24 is arranged so as to be relatively movable in the axial direction of the cylinder 24.

The rod 20 is inserted into the cylinder chamber 26 of the inner cylinder 22 from the distal end side of the rod 20. For this reason, a flange 28 is provided at the tip of the rod 22 to partition the cylinder chamber 26 into two chambers 26a and 26b. On the other hand, a reaction force body 18 is provided at the rear end of the rod 20.
A connecting portion 30 is attached by welding or bolts. The rod 20 is provided with a passage 3 for supplying a working fluid such as hydraulic oil to the chamber 26a for relatively moving the rod 20 and the cylinder 22 in the axial direction of the rod 20.
2a and a flow path 32b for supplying working fluid to the chamber 26b.

The cylinder 22 disposed inside has a first cylinder portion 34 defining a cylinder chamber 26 that opens rearward to receive the rod 20 so as to be relatively movable in the axial direction thereof.
Equipped with. An end plate 36 for airtightly closing the opening of the cylinder chamber 26 is releasably fixed to the opening of the cylinder chamber 26 with a plurality of bolts.

The end plate 36 has a hole 38 through which the rod 2o can slide.
is provided.

The cylinder 22 also includes an outer cylinder 24
the second cylinder part 4 which receives from the rear end side of the second cylinder part 4;
0. The rear end of the second cylinder part 38 is connected to the rear end of the first cylinder part 34 by a plurality of bolts so that the second cylinder part 40 and the cylinder 24 jointly define a cylinder chamber 42. Releasably fixed.

The outer cylinder 24 is provided with a ring-shaped piston 44 that partitions the cylinder chamber 42 into two chambers 42a and 42b. On the other hand, a connecting portion 46 connected to the movable body 14 with a bolt or the like is provided on the outer periphery of the tip end of the cylinder 24 . In the illustrated example, the connecting portion 46 consists of a flange. A pair of supports 48 having a rectangular shape are fixed to the outer periphery of the second cylinder portion 40 and spaced apart from each other in the axial direction of the rod 20 .

A working fluid that relatively moves the first and second cylinders 22, 24 in the axial direction of the rod 20 is supplied to the chamber 42a via a flow path 50a provided in the first cylinder part 34, and It is supplied to the chamber 42b via a flow path 50b provided in the second cylinder section 40. Flow path 50a and flow path 50b communicate with chambers 26a and 26b, respectively.

Between the rod 20 and the end plate 36, the flange 2 of the rod 20
8 and the first cylinder portion 34 of the cylinder 22, the first
between the cylinder part 34 and the end plate 38 of the cylinder 22, between the first and second cylinder parts 34.40 of the cylinder 22, between the second cylinder part 40 and the cylinder 24, the first cylinder 1
4's first cylinder part 34 and the piston 4 of the cylinder 24
4 and between the second cylinder portion 40 of the first cylinder 14 and the piston 44 of the cylinder 24 are maintained by the sealing material 52.

Note that the cylinder chamber 42 for the working fluid that moves the cylinders 22, 24 relative to each other may be formed by the first cylinder part 34 and the cylinder 24. Further, the jack 12 may be disposed coaxially in the radial direction of three or more cylindrical rods 20 and relatively movable in the axial direction of the rods.

In this case, the second cylinder portion 40 may be provided in one cylinder other than the outermost cylinder. 3
In the case of a jack with the above cylinders, when the jack is retracted, i.e. when the first and second connections are brought closest, the inner cylinder is more It is desirable to have a structure that protrudes forward.

As shown in FIGS. 1-3, when a plurality of jacks 12 are assembled into the tube 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. The jacks 12 of each jack assembly are stacked on the support 48 so as to extend parallel to each other and are interconnected at the support 48 by a plurality of bolts.

Such assembly work is performed on the base 16. Each jack 12 is connected to the reaction force body 18 at its connecting portion 30 with a bolt or the like, and is connected to the movable body 14 at its connecting portion 46 with a bolt or the like. Both jack assemblies are placed on the base 16 with a distance greater than the outer dimensions of the tube 54 to be propelled.

As shown in FIG. 1, a pipe 54 is provided in the center of the moving body 14.
A hole 56 having a diameter slightly smaller than the inner diameter of the hole 56 is formed.

On the other hand, holes 58 for receiving the second cylinder portion 34 of the jack 12 are formed at a plurality of locations on both sides of the hole 56 and spaced apart in the vertical direction.

The base 16 has a pair of rails 60 extending in parallel to receive the movable body 14 at its bottom, and a pair of rails 62 extending in parallel to receive the support 48 of the jack 12 disposed at the bottom thereof. Equipped with. Each rail 60.6
2 are connected to each other by a plurality of connecting members 64 so as not to be displaceable.

A sliding member 66 for smoothing the movement of the movable body relative to the rail 62 is attached to a portion of the support body 48 of the jack 12 disposed at the lowest position that faces the rail 62. For the same purpose, a sliding member (not shown) is also arranged at a portion of the movable body 14 that faces the rail 60.

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

In use, when each jack 12 is retracted, the entire main body of the rod 20 is accommodated in the cylinder chamber 26, as shown in FIG. It is projected forward by a distance from In this state, the tube 54 to be propelled is placed in front of the moving body 14 and between the jack assemblies.

When the working fluid is supplied to the flow path 32a, the cylinder 22 is moved forward by a distance m L I relative to the rod 20, and the cylinder 24 is moved forward by a distance HL relative to the cylinder 22.
Moved across. Due to stiffness, 12 points of stiffness, +
1,2 to advance the tube 54 the same distance.

When the jack 12 is extended, the movable body 14
Since the support 48 of the jack 12 located at the lowest position slides on the rail 62 while maintaining its position between the coupling parts 30.46, the jack 12 moves by its own weight or the tube to be propelled. It does not bend due to the weight of 54.

As shown in FIG. 1, when the jack 12 is fully extended, the distal end surface of the moving body 14 is
It has been moved to a position that protrudes slightly forward from the tip of No. 2. Also, the support 48 has been moved to a position between the connections 30.46.

When the working fluid is supplied to the flow path 32b with the jack 12 extended, the cylinder 22 is moved backward relative to the rod 20 by a distance 1IILI, and the cylinder 24 is moved backward relative to the cylinder 22 by a distance jllL. Moved by 2. As a result, the jack 12 is contracted as shown in FIGS. 2 to 4, and the movable body 14 is moved to a position where the first cylinder portion 34 of the cylinder 22 protrudes forward from the movable body 14 by a distance 11L. .

According to the tube propulsion device 10, the tube 54 can be disposed between the horizontally spaced jacks 12 and between the forward portions of the moving body 14, so that the connecting portions 30.46
The distance between the pipes is short, and there is no need to increase the size of the shaft in the direction of pipe propulsion.

Further, the cylinder 2 protrudes forward from the position of the moving body 14.
Since the tip of the tube 20 is disposed in the space necessary for the tube 54, even if the stroke L due to the relative movement between the rod 20 and the cylinder 22 is increased, a large shaft is not required. Therefore, even if the stroke L2 due to the relative movement of the cylinders 22, 24 becomes shorter, the stroke L1 due to the relative movement between the rod 20 and the cylinder 22 can be lengthened accordingly.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the tube propulsion device of the present invention when the jack is extended, and FIG. 2 is a perspective view of the tube propulsion device of FIG. 1 when the jack is retracted. 3 is a plan view of the tube propulsion device shown in FIG. 1 when the jack is retracted, and FIG. 4 is a sectional view showing an embodiment of the jack used in the tube propulsion device shown in FIG. 1. be. 10: Pipe propulsion device, 12: Jacket, 14: 8 Moving body, 16: Base, 18: Reaction body, 20: Rod, 22.24 Niji cylinder, 30.46: Connecting part, 32
a, 32b150a, 50b: flow path for working fluid, 34: first cylinder section, 40: second cylinder section, 48: support body, 54: pipe, 6
0,62: Rail.

Claims (8)

[Claims] (1) A rod that has a first connecting portion connected to the reaction body at its rear end, and is located around the rod and moves coaxially in the radial direction of the rod and relatively in the axial direction of the rod. at least one jack including a plurality of cylinders arranged so as to be movable; a movable body to be moved in the axial direction by the jack; and a movable body for receiving the movable body so that the movable body can be moved in the axial direction. A tube propulsion device including a base, wherein the outermost cylinder is provided with a second connecting part connected to the moving body, and one cylinder other than the outermost cylinder is provided with a second connecting part connected to the moving body. a first cylinder part that receives a rod or cylinder located inside the cylinder; and a first cylinder part surrounding the outermost cylinder that receives the outermost cylinder from the rear end side of the first cylinder part; a second cylinder part connected to the first cylinder part, and the innermost cylinder is configured to move the movable body in the axial direction when the first and second connecting parts are closest to each other. The tube propulsion device is characterized in that the jack is movably received in the axial direction by the base in the second cylinder portion. (2) The second connecting portion is disposed at a position forward of the first connecting portion in the axial direction, and the jack is connected to the first and second connecting portions in the axial direction.
The tube propulsion device according to claim 1, wherein the tube propulsion device is received by the base at a portion between the connecting portions of the tube propulsion device. (3) The tube propulsion device according to claim (2), wherein the second cylinder section is arranged to receive the outermost cylinder from its rear end side. . (4) When the first and second connecting portions are brought closest to each other, the tip of the cylinder disposed on the outside is set back from the tip of the cylinder disposed on the inside thereof. The tube propulsion device described in (3). (5) The innermost cylinder and the rod define a cylinder chamber to which working fluid is supplied to move them relatively, and the outermost cylinder and the second cylinder section define a cylinder chamber to which working fluid is supplied to move them relatively. The tube propulsion according to claim (1), which defines a cylinder chamber to which a working fluid is supplied for relatively moving the cylinder including the second cylinder portion and the outermost cylinder. Device. (6) the reaction force body is connected to the rear end of the base;
A tube propulsion device according to claim (1). (7) The base includes a pair of first rails extending in parallel so as to movably receive the movable body, and a pair of first rails extending in parallel so as to movably receive the support body provided in the second cylinder portion. The tube propulsion device according to claim 1, further comprising a pair of extending second rails. (8) Claim (1) comprising at least one pair of jacks arranged in parallel and spaced apart in the horizontal direction.
The tube propulsion device described in section.