JP2006214086A - Steel-pipe jacking excavator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steel-pipe jacking excavator which enables pipe jacking work to be easily performed, even if a heavy load is imposed on an leading end of a steel pipe, because sliding between a chuck and the steel pipe hardly occurs even without welding. <P>SOLUTION: Characteristically, this steel-pipe jacking excavator 1 has a chuck member 4 which holds the steel pipe X while enclosing the almost entire outer periphery of the steel pipe X; the chuck member 4 is composed of a plurality of chuck pieces 11; and irregularities are provided on a surface for contact with the steel pipe X so as to prevent sliding. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a steel pipe grinder for laying a buried pipe in soil.

When laying underground pipes such as water and sewage pipes and gas pipes horizontally in the soil, if there are no obstacles on the ground, the buried pipes can be laid by digging a groove from the ground. However, when trying to pass a buried pipe, if there are already waterways or dredgings in the upper part of the section, when trying to dig a ditch from the ground, these obstacles are temporarily removed and the buried pipe is laid. After completion, the removed one must be reconstructed, resulting in a large amount of work, cost, and work period. In addition, when water is flowing in the water channel, the water channel cannot be stopped even temporarily.

In view of this, a method has been implemented in which a steel pipe grinder is installed in a shaft (starting pit) provided in advance, and a submerged pipe line is constructed by propelling the pipe laterally from the starting pit. By doing so, it is possible to form a horizontal underground conduit without touching water channels or walls on the ground. A long underground pipe is used by using a pipe that has been cut to a certain length and repeating the process of inserting one pipe into the ground and then connecting the next pipe to the back and inserting it. It is also possible to build roads. The tip of the state-of-the-art steel pipe is provided with a superhard tip in the shape of a claw, and this tip part advances through the ground while rotating. For this reason, the steel pipe is firmly held by the chuck, and the chuck is rotated and pushed forward. For example, in the propulsion device described in Patent Document 1, a chuck claw is pressed against the outer periphery of a steel pipe to grip the steel pipe.
JP 2000-328875 A

In the conventional propulsion method, the gripping force is not sufficient only with the supporting force of the chuck, and slipping occurs when a strong load is applied when the tip of the steel pipe comes into contact with an underground object such as cobblestone, concrete, or steel sheet pile. In particular, the chuck pawl described in Patent Document 1 has a small contact area with the steel pipe and does not have a sufficient holding force.

Therefore, in the conventional steel pipe propulsion device, when the load starts to slip and the chuck starts to slip, the slip is prevented by welding and connecting the chuck and the steel pipe. When the chuck is opened, the weld is cut. Therefore, welding / cutting and grinder finishing are repeated, which increases the work load. Further, repeated welding / cutting causes wear and damage to the chuck and shortens the service life.

An object of the present invention is to provide a steel pipe grinder that is less likely to slip between a chuck and a steel pipe without welding, and that can easily perform propulsion work even when a large load is applied to the tip of the steel pipe. .

In order to solve the above-described problem, a steel pipe grinder of the present invention has a chuck member that grips the steel pipe while surrounding the outer periphery of the steel pipe almost entirely, and the chuck member is composed of a plurality of chuck pieces. The contact surface with the steel pipe is provided with unevenness to prevent slippage. Furthermore, it is preferable that the bolt can be pressed against the outer surface of the steel pipe. A hydraulic cylinder for opening and closing the chuck piece may be provided, or may be mechanically fastened by a tan buckle or the like. The chuck member may be provided with a hose attachment port through which the oil hose can be attached and detached.

In the steel pipe grinder of the present invention, the chuck piece provided with irregularities on the inner surface grips the steel pipe while making contact with the entire circumference, so that it is difficult for the chuck and the steel pipe to slip and a large load is applied to the steel pipe. Even if it has an effect that it can be constructed. Since it is not necessary to weld the chuck member and the steel pipe, the work load is reduced, and the chuck member is not worn or damaged.

The best mode for carrying out the present invention will be described with reference to the drawings. 1 is a perspective view showing a steel pipe grinder, FIG. 2 is a side view thereof, FIG. 3 is a front view showing a chuck, showing a closed state, FIG. 4 showing an opened state, and FIG. FIG. 6 is a detailed view showing the inner surface of the chuck piece, and FIG. 7 is a front view showing the attachment of the chuck.

The steel pipe grinder shown in FIG. 1 has a moving part 2 and a fixed part 3. The moving unit 2 includes a chuck member 4 to which a steel pipe is attached and a drive source 5 that rotates the chuck member 4. Here, a hydraulic drive motor is used as the drive source 5 and the chuck member 4 is rotated via the speed reducer 6.

The fixed part 3 has a guide rail 7. A slide member 8 is provided so as to be able to advance and retreat on the guide rail 7, and the slide member 8 is driven to move forward and backward by a hydraulic cylinder 9. The moving unit 2 is provided on the slide member 8. The steel pipe grinder 1 includes an operation unit 10 for operating the opening and closing and rotation of the chuck member 4 and the movement of the slide member 8.

Next, details of the chuck member 4 will be described. The chuck member 4 has a chuck piece that surrounds the outer periphery of the steel pipe X over the entire circumference. This chuck piece is divided into a plurality of pieces, and in this example, three chuck pieces 11a, 11b, and 11c are provided. Chuck pieces 11b and 11c are rotatably provided at both end portions of the chuck piece 11a via a rotary shaft 12. The chuck pieces 11b and 11c are connected by an extendable hydraulic cylinder 13. The inner diameter of the chuck piece 11 substantially matches the outer diameter of the largest steel pipe X to be used.

When the hydraulic cylinder 13 is extended, the chuck pieces 11b and 11c are expanded as shown in FIG. In this state, the steel pipe X can be inserted into the internal space surrounded by the chuck pieces 11a, 11b, and 11c. Next, when the hydraulic cylinder 13 is contracted, the chuck pieces 11b and 11c are narrowed, and the inner surfaces of the chuck pieces 11a, 11b and 11c are pressed against the outer surface of the steel pipe X. When the hydraulic cylinder 13 is contracted until a sufficient tightening force is obtained, the steel pipe X is gripped by the chuck member 4. In this state, the steel pipe X is fixed in accordance with the rotation center of the chuck member 4, so that a complicated operation for centering is not required.

In the state shown in FIG. 3, the chuck pieces 11 a, 11 b, 11 are gripped while surrounding the outer circumference of the steel pipe X over the entire circumference. The inner surfaces of the chuck pieces 11a, 11b, 11 are provided with irregularities as shown in FIG. This unevenness increases the frictional force and increases the gripping force of the chuck member 4. In particular, it is preferable that the unevenness has both an unevenness substantially along the circumferential direction and an unevenness along a direction perpendicular thereto. The chuck member 4 rotates while gripping the steel pipe X, and pushes the steel pipe X forward (to the left in FIG. 2). Therefore, by providing the unevenness as shown in FIG. 6, both the slip in the circumferential direction and the slip in the length direction of the steel pipe X can be stopped.

As shown in FIG. 5, the chuck member 4 of this example can be attached with a steel pipe fixing bolt 14 for fixing the steel pipe X. The chuck piece is provided with a steel pipe fixing bolt hole 15 through which the steel pipe fixing bolt 14 is passed. The clamping force of the chuck member 4 is further increased by tightening the chuck piece 11 with the force of the hydraulic cylinder 13 and pressing the steel pipe fixing bolt 14 against the outer surface of the steel pipe X. Thereby, even under many construction conditions, slipping can be prevented without welding the chuck piece 11 and the steel pipe X.

The hydraulic hose that drives the hydraulic cylinder 13 can be always connected, but for this purpose, it is necessary to have a swivel structure in which a seal is applied to the rotating portion of the chuck member 4. In this example, the chuck member 4 is provided with a hydraulic hose attachment port (pilot check valve) having a reversely supported valve. When the chuck piece 11 is opened and closed, a hydraulic hose is attached to the hydraulic hose attachment port, and the hydraulic cylinder 13 is operated by the operation unit 10. When the chuck piece 11 is closed and the steel pipe X is gripped, the chuck member 4 can be rotated by removing the hydraulic hose. Since a reverse support valve is provided at the hydraulic hose attachment port, oil does not leak even if the hydraulic hose is removed, and the tightening of the chuck piece 11 is maintained. Thus, the chuck member 4 can be made a simple structure by making the hydraulic hose attachable to and detachable from the hydraulic hose attachment port.

When a steel pipe having an outer diameter smaller than the inner diameter of the chuck piece 11 is used, the attachments 16a, b, c are attached to the inside of the chuck pieces 11a, b, c as shown in FIG. The chuck piece is provided with a bolt hole 17 for attaching an attachment. By attaching this attachment 16, a smaller inner diameter chuck piece can be formed. The inner surface of the attachment 16 is also provided with irregularities in the same manner as the chuck piece 11, and slipping is less likely to occur when the steel pipe X is gripped. Also, the attachments 16a, b, c are provided with steel pipe fixing bolt through holes, and the positions of the steel pipe fixing bolt through holes and the steel pipe fixing bolt holes 15 when attached to the chuck pieces 11a, b, c. Has come to fit. Therefore, even when the attachments 16a, b, and c are attached, the steel pipe fixing bolt can be attached, and slipping can be effectively prevented.

By preparing a plurality of attachments 16 having different inner diameters, steel pipes having various diameters can be used.

The steel pipe grinder 1 of this example has an operation unit 10 for performing various operations necessary for operation in a concentrated manner. FIG. 8 is an explanatory diagram showing an outline of the hydraulic unit. A hydraulic unit 18 including a hydraulic motor is connected to the hydraulic cylinders 9 and 13 of the main body 19 of the steel pipe machine 1 through the operation unit 10. The operation unit 10 is configured independently of the hydraulic unit 18 and the main body 19. In conventional steel pipe grinders, the hydraulic unit and the hydraulic cylinder of the main unit are connected by various hoses such as a high-pressure hose, return hose, drain hose, etc., but the number of hoses, hose size, attachment port for each manufacturer Because of the different shapes and so on, connection was not compatible between different manufacturers. Therefore, a dedicated hydraulic unit must be purchased each time a steel pipe grinder is newly introduced, and duplicate capital investment is required. Moreover, it was not possible to flexibly operate the hydraulic unit and the body unit suitable for the construction site and construction conditions. However, since the operation unit 10 is an independent member and the hydraulic unit 18 and the main body 19 are connected via the operation unit 10 as in this example, the difference between the connection hose and the attachment port is the operation unit 10. Can be converted. Therefore, if an operation unit corresponding to the necessary hydraulic unit is selected, various hydraulic units can be connected to the same main body. Therefore, the hydraulic unit can be selected considering only performance such as pressure and discharge amount. In addition, existing hydraulic units can be used effectively. Furthermore, by making the operation unit 10 a remote operation unit that can be separated from the main body, the work of inserting the steel pipe into the ground can be performed remotely from the outside of the shaft, thereby improving the safety of the work. You can also.

The present invention can be applied to various underground propulsion works such as water and sewage systems, gas pipes, and various cables. Construction is possible even if there are obstacles such as waterways above the buried pipe. Since the steel pipe is firmly gripped, it can be used as a general-purpose steel pipe grinder that can be constructed without causing slippage even in various soil types. Since it is not necessary to weld the steel pipe and the chuck, the steel pipe can be easily attached to and detached from the chuck member, the work load is reduced, and the cost and work period can be reduced. Further, the chuck member is less damaged and worn, and can be used as a long-life steel pipe machine.

It is a perspective view which shows a steel pipe grinder. It is the same side view. It is a front view which shows a chuck | zipper, and shows the closed state. It is a front view which shows a chuck | zipper, and shows the open state. It is sectional drawing which shows a bolt part. It is detail drawing which shows the inner surface of a chuck | zipper piece. It is a front view which shows the attachment of a chuck | zipper. It is explanatory drawing which shows an operation unit.

Explanation of symbols

1. Steel pipe machine 2 2. Moving unit Fixed part 4. 4. Chuck member 5. Hydraulic motor Reducer 7. Guide rail8. 8. Slide member Hydraulic cylinder 10. Operation unit 11. Chuck piece 12. Support shaft 13. Hydraulic cylinder 14. Steel tube fixing bolt 15. Steel tube fixing bolt hole 16. Attachment 18. Hydraulic unit 19. Body part

Claims (4)

It has a chuck member that grips the outer periphery of the steel pipe while encircling the entire circumference, and this chuck member is composed of a plurality of chuck pieces, and unevenness is provided on the contact surface with the steel pipe to prevent slippage. A steel pipe grinder characterized by The steel pipe grinder according to claim 1, wherein the bolt can be pressed against the outer surface of the steel pipe. The steel pipe grinder according to claim 1 or 2, wherein the chuck pieces are connected via a hydraulic cylinder so as to be opened and closed. The steel pipe grinder according to claim 3, wherein a hydraulic hose attachment port through which the hydraulic hose can be attached and detached is provided in the chuck member.

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