JPH061494U - Propulsion tube rolling prevention mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the excavator body from rotating with the bit due to the rotating torque of the excavation bit during the construction work of the pipeline by the propulsion method. [Structure] A projection 1 is formed on an end surface of a socket 12 of a machine main body 11A.
8 is formed, and a locking piece 19 is provided on the outer periphery of the insertion opening 13 in the subsequent propulsion tube 11B. When the insertion opening 13 is inserted into the receiving opening 12, the protrusion 18 and the locking piece 19 engage with each other in the pipe circumferential direction. [Effect] The rotary torque T of the bit mounted on the tip of the excavator body 11A is determined by the excavator body 11A and the propulsion pipe 11B.
Since it is received by the frictional force F between both of them and the ground 21, it is possible to prevent the excavator body 11A from being rotated together with the bit and being unable to be propelled.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a propulsion tube rolling prevention mechanism for preventing the propulsion tube from rotating together with the bit due to the rotational torque of the excavation bit when laying a pipeline by the propulsion method.

[0002]

[Prior art]

 Conventionally, when a pipeline such as a gas pipe is laid in the ground by a propulsion method, as shown in FIG. 3, the excavation bit 2 is attached to the tip of the excavator body 1a that constitutes the leading propulsion pipe. While excavating the ground 3 by rotating the bit 2, the propulsive force P is applied to the rear end of the excavator body 1a to propel the excavator body 1a into the ground 3. Following that, the insertion port of the subsequent propulsion pipe 1b is inserted into the receiving port of the excavator body 1a, and the propulsive force P is applied to the receiving side of this propulsion pipe 1b to propel both 1a and 1b into the ground 3. Let In the same manner thereafter, new propulsion pipes are successively added and propelled into the ground 3, whereby the pipeline is laid in the ground 3.

In this case, as the reaction torque against the rotational torque T of the bit 2, the excavator main body 1 a uses the bit 2 by utilizing the frictional force F between the outer periphery of the leading excavator main body 1 a and the ground 3. It prevents you from going around.

[0004]

[Problems to be solved by the device]

 However, in such a conventional configuration, since the magnitude of the friction torque F generated between the ground 3 and the ground 3 is limited, the rotational torque T of the bit 2 is more than the friction force F during some laying work. Can also grow. For this reason, there is a problem that the excavator body 1a may be continuous with the bit 2 and may not be excavated.

Therefore, the present invention has an object to solve such a problem and reliably prevent the occurrence of accompanying rotation.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a propulsion tube in which the insertion opening of the other tube is inserted into the reception opening of the other tube so that the propulsive force can be transmitted between the reception openings. A protrusion is formed on one of the insertion port and the insertion port, and a locking piece that engages with the protrusion in the circumferential direction of the tube when the insertion port is inserted into the receiving port is provided on the other side.

[0007]

[Action]

 According to such a configuration, by inserting the insertion port of the other propulsion pipe into the receiving port of the one propulsion pipe, the projection and the locking piece engage with each other in the pipe circumferential direction. As a result, the preceding propulsion pipe and the succeeding propulsion pipe are connected to each other via this engaging portion so that torque can be transmitted. Therefore, if the next propulsion pipe is connected to the main body of the excavator as the leading propulsion pipe with the excavation bit attached to the tip through the engaging part, the rotational torque of the bit is between the two propulsion pipes and the ground. It is received by a large friction force. Therefore, it is possible to reliably prevent the excavator body from rotating with the bit and making it impossible to excavate.

[0008]

【Example】

 1 and 2, the anti-rolling mechanism of the present invention is applied to the excavator body 11A as a preceding propulsion pipe and the succeeding propulsion pipe 11B connected thereto. A receiving port 12 is formed at the rear end of the excavator body 11A, and an insertion port 13 to be inserted into the receiving port 12 is formed at the front end of the propulsion pipe 11B. A coating 14 such as a concrete is applied to the outer circumference of the tube body, and the outer circumference of the coating 14 is covered with an exterior steel plate 15. A thrust receiving surface 16 is formed at the inner end of the receiving opening 12 and an annular sealing material 17 is attached to the opening end side thereof.

A round bar-shaped projection 18 in the pipe axis direction is formed on the end surface of the receptacle 12 of the excavator body 11A. A locking piece 19 is fixed to the outer periphery of the subsequent propulsion tube 11B, and a projection 18 can be inserted into the locking piece 19 when the insertion opening 13 is inserted into the receiving opening 12. The hole 20 is formed.

In such a structure, in order to lay a pipeline in the ground 21 by the propulsion method, the excavator main body 11A is set as the head, the excavation bit is attached to the tip, and the bit is rotated to move the ground 21. While excavating, a propulsive force P is applied to the inlet 12 side of the excavator body 11A.

Subsequently, the insertion port 13 of the subsequent propulsion pipe 11B is inserted into the receiving port 12 of the excavator body 11A, and the tip end surface of the insertion port 13 is brought into contact with the thrust receiving surface 16 of the receiving port 12. At the same time, the projection 18 of the receiving port 12 is inserted into the insertion hole 20 of the locking piece 19 of the insertion port 13. As a result, the protrusion 18 and the locking piece 19 are engaged with each other in the pipe circumferential direction, and the excavator main body 11A and the propulsion pipe 11B are connected so that torque can be transmitted.

When a propulsive force P is applied to the receiving end side of the rear end of the propulsion pipe 11B, the tip end surface of the insertion opening 13 of the propulsion pipe 11B presses the thrust receiving surface 16 of the receiving end 12 of the excavator body 11A, The excavator body 11A and the propulsion pipe 11B are propelled into the ground 21. Further, the pipes are laid in the ground 21 by sequentially adding the propulsion pipes and propelling them into the ground 21. At that time, the rotational torque T of the bit is received by the frictional force generated between the outer peripheries of the excavator main body 11A and the propulsion pipe 11B and the ground 21. Therefore, the excavator main body 11A and the propulsion pipe 11B are prevented from rotating together with the bit, and the situation in which the bit cannot be excavated is avoided.

A similar rolling prevention mechanism may be provided between the propulsion pipe 11B and another propulsion pipe subsequent to the propulsion pipe 11B.

[0014]

[Effect of device]

 As described above, according to the present invention, a protrusion is formed on one of the receiving port and the insertion port, and on the other hand, when the insertion port is inserted into the receiving port, the protrusion is engaged in the pipe circumferential direction. Since the locking piece is provided, the rotation torque of the bit attached to the excavator main body as the preceding propulsion pipe is reduced by the frictional force generated between both the excavator main body and the subsequent propulsion pipe and the ground. Therefore, it is possible to reliably prevent the situation in which the excavator body goes around with the bit and cannot be propelled.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main portion of a propulsion pipe having a rolling prevention mechanism according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a schematic view showing an example of a conventional propulsion pipe laying work.

[Explanation of symbols]

 11A Excavator body 11B Propulsion tube 12 Receiving port 13 Inserting port 18 Protrusion 19 Locking piece

Claims (1)

[Scope of utility model registration request] 1. A propulsion tube in which the insertion opening of the other tube is inserted into the reception opening of the one tube so that the propulsive force can be transmitted between the reception opening and the insertion opening. A rolling prevention mechanism for a propulsion pipe, characterized in that a protrusion is formed on one side and, on the other side, a locking piece that engages with the protrusion in the pipe circumferential direction when the insertion port is inserted into the receiving port is provided on the other side.