JPH06264687A - Pushing device - Google Patents

Abstract

PURPOSE:To eject a lubricant intermittently from an ejection port by moving a piston back and forth in a cylinder chamber in a pushing head having a lubricant ejection port in its end to impart an impact pushing force to the pushing head itself. CONSTITUTION:A liquid is supplied from a liquid pressure source into a pressure chamber 9 via liquid feed passage 8 to move a piston 5 to a base end side, thereby separating the piston 5 from a receiving surface. And when the liquid has been fed into the chamber 9 and the stored quantity of the liquid in the chamber 9 has reached a specific quantity, a valve mechanism A is opened to discharge the liquid from the chamber 9. And then the liquid is ejected to the end side of a push head 1 from a liquid ejection port 4 via a communicating passage 10. And as soon as the liquid is discharged from the chamber 9, an urging force of compression springs 11a, 11b against the end of the piston 5 exceeds a moving force of the piston toward the end side. And the piston 5 is advanced by a given advancing force so that the piston makes contact with the receiving surface to close the mechanism A. As a result, the straightly advancing property of the push body and after-treatment of lubricant can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion device for propelling a propellant into the ground.

[0002]

2. Description of the Related Art For example, when a conduit such as a gas pipe is buried in the ground without forming an excavation groove in the ground, the propulsion unit is propelled into the ground by the propulsion device and then The work of pulling in the conduit to be buried instead is being carried out. The propulsion device includes, for example, as shown in FIG. 3, a propulsion head 1 that cuts the head and propels into the soil, and a plurality of propulsion pipes 2 that are sequentially added to follow the propulsion head 1. The propulsion unit was propelled by the propulsion unit 3 arranged on the base end side of the propulsion unit. In order to easily propel the propulsion head 1 into the soil, a lubricant made of a liquid such as water is usually constantly supplied around the propulsion head 1.

[0003]

However, in the above propulsion device, only the propulsive force of the propulsion unit 3 is used.
Since the entire propelling body composed of the propulsion head 1 and the plurality of propulsion pipes 2 is collectively propelled from the base end side, a large apparatus having large propulsive force is required as the propulsion device 3 and the equipment cost increases. There is a problem that if the propulsion body becomes long, the straightness thereof deteriorates and the propulsion body may buckle on the way. Further, since the liquid lubricant such as water is constantly supplied to the periphery of the propulsion head 1, there is a problem that the amount of waste of the lubricant after use becomes large, and the treatment thereafter becomes troublesome. The present invention has been made by paying attention to such an actual situation, and an object thereof is to provide a means capable of solving the above-mentioned problems at once.

[0004]

A characteristic structure of a propulsion device according to the present invention (hereinafter, referred to as the device of the present invention) is a cylinder chamber having a piston inside a propulsion head having a liquid ejection port formed at its tip. And a liquid supply path capable of supplying the liquid from the liquid pressure source on the proximal end side to the distal end side, and the liquid supplied via the liquid supply path can be stored and is located at the distal end portion of the cylinder chamber. Forming a pressure chamber and a communication passage that allows the pressure chamber and the liquid ejection port to communicate with each other, and urging means for urging the piston toward the tip end side is provided in the cylinder chamber to communicate with the pressure chamber. A valve mechanism that is operated to open the valve when the amount of the liquid stored in the pressure chamber reaches a certain amount and is normally urged to be closed is provided between the passage and the passage. The liquid is supplied to the pressure chamber. Based on the above, the piston is set to a size that allows the piston to move toward the base end side, and the tip side inner wall surface of the pressure chamber is a receiving surface that receives the forward force of the piston moving to the tip side. It is in the point of being formed.

[0005]

According to the apparatus of the present invention, when the liquid from the liquid pressure source is supplied into the pressure chamber through the liquid supply passage in the state where the valve mechanism is closed, the liquid is supplied based on the supply. As a result, the piston moves toward the base end side, and the piston is separated from the receiving surface (that is, the inner wall surface on the front end side of the pressure chamber). This is because the urging force of the urging means is set to a magnitude that allows the piston to move toward the base end side when the liquid is supplied into the pressure chamber. . Then, when the supply of the liquid into the pressure chamber progresses and the storage amount of the liquid in the pressure chamber reaches a certain amount, the valve mechanism is opened, and the liquid stored in the pressure chamber is , Is discharged from the pressure chamber, reaches the liquid ejection port via the communication passage, and is ejected from the liquid ejection port to the tip side of the propulsion head. Further, at the moment when the liquid is discharged from the pressure chamber, the urging force of the urging means overcomes the force to move the piston toward the base end side, and imparts a forward force to the piston. The forward force causes the piston to move forward so as to impact the receiving surface. Then, when the piston comes into contact with the receiving surface, the valve mechanism is closed, and the initial state described at the beginning is realized again.

[0006]

According to the apparatus of the present invention, since the above-mentioned series of cycles are repeated, the piston impacts the receiving surface at each cycle so that the propulsion head itself produces a propulsive force. Become. Therefore, the size of the propulsion unit for propelling the propulsion unit including the propulsion head and the plurality of propulsion pipes subsequent thereto can be reduced, and the conventional problem that the equipment cost of the propulsion unit increases can be solved. Depending on the soil properties of the ground on which the propelling body is to be propelled, the propelling body may be able to be propelled without using the propulsion unit. In addition, since a propulsive force is generated in the propulsion head itself, even if the propulsion body is long, the propulsion head can be easily moved straight, which may cause the propulsion body to buckle midway. The problem will be resolved. Furthermore, each time the cycle is
Since the liquid is intermittently ejected from the liquid ejection port as a lubricant to the tip side of the propulsion head, compared with a conventional device in which the lubricant is constantly supplied to the periphery of the propulsion head, The amount of waste after use is reduced, the post-treatment is facilitated, and the conventional problems regarding the post-treatment of the lubricant are eliminated.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the portions denoted by the same reference numerals as the conventional example indicate the same or corresponding portions.

1 and 2 show, as an embodiment of the device of the present invention, a propulsion device used for burying a gas pipe in the soil without forming an excavation groove in the ground.

Reference numeral 1 in FIG. 2 denotes a propulsion head that constitutes a main part of the device of the present invention, that is, a propulsion head that cuts the head and propels it into the soil. As described above, the plurality of propulsion pipes 2 are sequentially added in the propulsion process, and the propulsion body including the combination of the propulsion head 1 and the plurality of propulsion pipes 2 is arranged on the proximal end side of the propulsion body. It is propelled into the soil by the propulsion device 3.

As shown in FIG. 1, the outer shell of the propulsion head 1 is composed of a combination of a conical tip member 1a, an intermediate cylindrical member 1b, and a base end plug member 1d. The base end side opening of the intermediate cylindrical member 1b is closed in an airtight state to the outside by the base end plug member 1d, and the tip end side opening of the intermediate cylindrical member 1b is airtight to the outside by the tip conical member 1a. The propulsion head 1 is internally closed to form an airtight closed space with respect to the outside. Further, a plurality of liquid ejection ports 4 for ejecting liquid (tap water in this embodiment) as a lubricant at the time of propulsion of the propulsion head 1 to the front end side of the propulsion head 1 are formed at the front end of the propulsion head 1. ing.

As mentioned above, a closed space that is airtight to the outside is formed inside the propulsion head 1. The closed space causes the piston 5 to reciprocate in the axial direction of the propulsion head 1. A cylinder chamber 6 that can be freely incorporated is configured. In addition, inside the propulsion head 1,
Axial cores of the plurality of propulsion pipes 2 delivered from a liquid pressure source 7 (see FIG. 2) arranged on the base end side of the propelling body (specifically, the ground portion where the propelling body starts propelling). A liquid supply passage 8 is formed so that the liquid can be supplied to the tip side of the propulsion head 1 via the respective passages 2a formed in the respective parts. Further, the tip of the cylinder chamber 6 constitutes a pressure chamber 9 capable of storing the liquid supplied through the liquid supply passage 8. The cylinder chamber 6
A urging means 11 for urging the piston 5 toward the distal end side is provided at the base end side portion of the. Further, the pressure chamber 9 and the liquid ejection port 4 are communicated with each other by a communication passage 10 formed in the shaft core portion of the tip conical member 1a.

More specifically, the liquid supply passage 8 is constructed as follows. That is, in the propulsion head 1, the base end portion is formed so as to penetrate the shaft core portion of the base end plug member 1d so that the base end portion is fitted in the passage 8a, and the tip conical member 1a is formed.
The distal end portion is internally fitted to the communication passage 10 formed in (the internal fitting state is released when the valve mechanism A described later is opened), and the penetrating portion formed in the shaft core portion of the piston 5 The valve rod 12 having the intermediate portion inserted in the hole 5a is
It is provided so as to be slightly movable in the front-rear direction, and a central hole 8b is formed in the axial center portion of the valve rod 12 in the open state at the proximal end side and the closed state at the distal end side. The liquid supply passage 8 is constituted by the passage 8a formed in 1d and the central hole 8b formed in the valve rod 12. In addition, a plurality of openings to the pressure chamber 9 that are opened in a direction orthogonal to the central hole 8b are formed at the tip side closed portion of the central hole 8b.

The piston 5 is reciprocally housed in the cylinder chamber 6 as described above.
Specifically, the reciprocating movement of the piston 5 is performed while the piston 5 is slidably fitted on the valve rod 12 while being guided in the front-rear direction. An O-ring 13 is externally fitted to the middle abdomen of the piston 5 in order to maintain the airtightness of the pressure chamber 9 when the piston 5 reciprocates.

The urging means 11 includes the cylinder chamber 6
Two compression coil springs 11a, 1 arranged in series at the base end side portion (more specifically, the base end side space from the position of the piston 5 in the cylinder chamber 6).
1b (that is, the first compression coil spring 11a located on the base end side and the second compression coil spring 11b located on the tip end side). An intermediate ring 14 is interposed between the two compression coil springs 11a and 11b. The urging force of the urging means 11 is set to a magnitude that allows the piston 5 to move toward the base end side when the liquid is supplied to the pressure chamber 9. .

Between the pressure chamber 9 and the communication passage 10,
A valve mechanism A is provided, which is operated to open the valve when the amount of the liquid stored in the pressure chamber 9 reaches a certain amount, and is normally urged to be closed. The opening / closing operation of the valve mechanism A is specifically performed as follows. That is, an enlarged diameter portion 12a that can interfere with the intermediate ring 14 in the front-rear direction is formed on the outer peripheral portion of the valve rod 12 at an appropriate position in the longitudinal direction, so that the urging force of the first compression coil spring 11a is increased. It is transmitted to the valve rod 12 through the diameter portion 12a, and the urging force of the valve rod 12 causes the tip end portion of the valve rod 12 to be tightly fitted in the communication passage 10 so that the valve rod 12 is normally urged to be closed. It is in the state of being When the amount of the liquid stored in the pressure chamber 9 reaches a certain amount, the two compression coil springs 11a and 11b are moved based on the movement of the piston 5 toward the base end side with the increase in the stored amount. Becomes a compressed state, and based on the compression deformation, the valve rod 1
The state in which the tip end of No. 2 is closely fitted into the communication passage 10 is broken, and the valve closed state (see FIG. 1 (a)) is changed to the valve opened state (see FIG. 1 (b)). There is.

Further, the inner wall surface 9a of the pressure chamber 9 on the front end side is formed.
Is formed on the receiving surface that receives the forward force of the piston 5 moving toward the tip side. Further, between the base end of the valve rod 12 and the passage 1d provided in the base end plug member 1d, the valve is opened when the liquid is supplied to the pressure chamber 9, and the valve mechanism is provided. An auxiliary valve mechanism B is provided which is closed when A is opened and the liquid is discharged from the pressure chamber 9.

According to such a device of the present invention, the valve mechanism A
When the liquid is supplied from the liquid pressure source 7 into the pressure chamber 9 via the liquid supply passage 8 in the state where the valve is closed as shown in FIG. When the piston 5 moves to the side, the piston 5 is separated from the receiving surface. Then, when the supply of the liquid into the pressure chamber 9 progresses and the stored amount of the liquid in the pressure chamber 9 reaches a certain amount, the valve mechanism A opens the valve as shown in FIG. The liquid stored in the pressure chamber 9 is discharged from the pressure chamber 9 as shown by the arrow in FIG. 1B, reaches the liquid ejection port 4 via the communication passage 10, and the liquid ejection is performed. It comes to be ejected from the outlet 4 to the tip side of the propulsion head 1. Also,
At the moment when the liquid is discharged from the pressure chamber 9, the urging force of the urging means 11 overcomes the force for moving the piston 5 to the base end side, and gives the piston 5 a forward force. The forward force causes the piston 5 to move forward so as to impact the receiving surface. Then, when the piston 5 comes into contact with the receiving surface, the valve mechanism A is closed and the initial state described at the beginning is realized again.

Next, another embodiment will be described. In the above-described embodiment, the propulsion body sequentially adds the plurality of propulsion pipes 2 following the propulsion head 1 in the propulsion process, but the propulsion body includes the plurality of propulsion heads subsequent to the propulsion head 1. An embodiment is conceivable in which the pipe 2 is replenished in advance prior to the propulsion process, and the propulsion body is propelled by the propulsion force of the propulsion head 1 or the like.

The apparatus of the present invention can be used when a conduit other than a gas pipe (for example, a water pipe) is buried in the ground without forming an excavation groove on the ground, and also when a long body other than the conduit (for example, a pipe) is used. It can also be used when propelling a wire into the ground without forming a trench in the ground.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the overall configuration of the device of the present invention.

FIG. 2 is a vertical cross-sectional view showing the main part of the device of the present invention.

FIG. 3 is a vertical sectional view showing the overall configuration of a conventional device.

[Explanation of symbols]

 1 Propulsion Head 4 Liquid Jet Port 5 Piston 6 Cylinder Chamber 7 Liquid Supply Source 8 Liquid Supply Channel 9 Pressure Chamber 10 Communication Passage 11 Energizing Means A Valve Mechanism

Claims (1)

[Claims] 1. A cylinder chamber (6) containing a piston (5) inside a propulsion head (1) having a liquid ejection port (4) formed at its tip and a liquid pressure source (7) at the base side. ), A liquid supply path (8) capable of supplying the liquid from the front end side, and the liquid supplied via the liquid supply path (8) can be stored in the front end portion of the cylinder chamber (6). A pressure chamber (9) located and a communication passage (10) that allows the pressure chamber (9) and the liquid ejection port (4) to communicate with each other are formed, and the piston (5) is provided in the cylinder chamber (6). ) For urging the pressure chamber (9) toward the tip side, the storage amount of the liquid in the pressure chamber (9) is constant between the pressure chamber (9) and the communication passage (10). A valve mechanism (A) is provided that is operated to open when it reaches a certain amount and is normally urged to be closed. The urging force of the step (11) is set to a magnitude that allows the piston (5) to move toward the base end side based on the supply of the liquid to the pressure chamber (9), A propulsion device having an inner wall surface (9a) on the tip side of the pressure chamber (9) formed as a receiving surface for receiving the forward force of the piston (5) moving to the tip side.