JPH0522691U - Structure of pipe joint for propulsion method - Google Patents

Abstract

(57) [Abstract] [Purpose] A pipe joint part for a propulsion method that can easily correct the direction of the propulsion device while preventing relative displacement of the pipes around the axial center, and that is also compatible with the curve propulsion method. Those that provide the structure. [Structure] The insertion port 5 of the other pipe 3 is inserted into the inside of the reception port 4 of the one pipe 3 so that the pipes 3 can be bent between the insertion port 5 and the reception port 4, A pair of socket-side engaging metal fittings 11 are fixed to the tip end of the socket, and an socket-side engaging metal fitting 12 is fixed to the outer surface of the socket 5 by welding. When the pipes 3 are joined so that the side engaging metal fittings 12 are sandwiched between them and the insertion opening 5 and the receiving opening 4 are relatively displaced about the axis, 11 and mating metal fitting 12
And abut each other to prevent relative displacement around the axis.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a pipe joint portion for a propulsion method.

[0002]

[Prior Art]

 A propulsion method in which a pipe is propelled underground to be laid is generally known. In this propulsion method, as shown in FIG. 5, when the propelling device 2 for excavating while rotating the cutter head 1 at the tip is used to propel the pipe 3 connected to the rear of the propulsion device 2, the cutter head 1 The reaction force for rotating is received by the frictional force between the outer surfaces of the propulsion device 2 and the pipe 3 and the soil A.

Here, as shown in FIG. 6, in a pair of pipes 3 connected to each other, a receiving port 4 is provided at an end of one pipe 3 and a receiving port 4 is provided at an end of the other pipe 3. Insertion ports 5 to be inserted into the interiors of the respective 4 are formed. An annular groove 6 is formed on the inner periphery of the receiving port 4, and a rubber ring 7 made of an annular sealing material that is compressed between the annular groove 6 and the outer periphery of the insertion port 5 is housed therein.

In the joint structure described above, the rotational reaction force at the joint portion of the pipe 3 is restricted only by the surface pressure of the rubber ring 7, so that the rotational reaction force of the propulsion device 2 is large. If a large reaction force is required for some reason, the rotational reaction force at the joint of the pipe 3 becomes greater than the frictional force in the circumferential direction due to the surface pressure of the rubber ring 7, and the propulsion device 2 itself rotates. There is a risk that it will not be possible to excavate. For this reason, as shown in FIG. 6, conventionally, the iron plate is spread over the inner surface of the joint portion of the pipe 3 connected immediately after the propulsion device 2, that is, the inner surface of the distal end portion of the insertion opening 5 and the inner surface of the rear end portion of the receiving opening 4. 8 was welded to restrain the rotation of the joint portion of the pipe 3 so that a large frictional force with the soil A could be obtained. In addition, 9 is an exterior concrete cast on the outer periphery of the pipe 3, and further on the outer periphery of the exterior concrete 9, a cylindrical exterior plate 10 that is flush with the maximum outer diameter portion of the receiving port 4 is provided. It is being done.

[0005]

[Problems to be solved by the device]

 However, according to the above-mentioned conventional configuration, since the pipes 3 are completely fixed to each other through the iron plate 8 and the bending of the joint portion of the pipe 3 is also restrained, it is difficult to correct the direction of the propulsion device 2. However, there were problems such as being unable to handle the curve propulsion method.

The present invention solves the above-mentioned problem. The propulsion method is capable of easily correcting the direction of the propulsion device while preventing relative displacement of the tubes around the axial center, and is also compatible with the curve propulsion method. The purpose of the present invention is to provide a structure of a pipe joint portion.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problem, the present invention provides the insertion opening and the receiving opening with engaging portions that come into contact with each other when the insertion opening and the receiving opening are relatively displaced about the axis. It is a thing.

[0008]

[Action]

 With the above configuration, when the insertion opening and the receiving opening are relatively displaced about the axis, the engaging portions provided in the insertion opening and the receiving opening contact each other and the rotational reaction force is generated. Is reliably transmitted to. As a result, relative displacement of the insertion opening and the receiving opening around the axis is prevented, and the frictional force with the soil is increased to prevent rotation of the propulsion device itself. On the other hand, since the structure does not fix the pipes to each other, it can be bent between the insertion port and the receiving port, the direction of the propulsion device can be easily corrected, and the curve propulsion method can be applied.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. In addition, the same reference numerals are given to those having the same function as the conventional one, and the description thereof is omitted.

As shown in FIGS. 1 and 2, a pair of socket-side fittings 11 extending along the axial direction are further welded to the tip of the socket 4 at appropriate intervals in the circumferential direction. It is fixed. On the outer surface of the insertion port 5 to be inserted into the receiving port 4, an insertion side engaging metal fitting 12 protruding outward toward the exterior plate 10 side is fixed by welding. The pipes 3 are joined so that the insertion side engaging metal fitting 12 is sandwiched between the metal fittings 11.

It should be noted that the exterior concrete 9 portion on the insertion opening 5 side in which the receiving-side engagement fitting 11 and the insertion-side engagement fitting 12 are arranged is cut out to form a recess 13. Further, the insertion opening 5 of the other tube 3 is inserted into the inside of the receiving opening 4 of the one tube 3, and the tubes 3 are shown between the insertion opening 5 and the receiving opening 4, for example, in phantom lines in FIG. As such, it is bendable.

In the above configuration, when the cutter head is driven to exert a rotational reaction force on the joint portion of the pipe 3 and the insertion opening 5 and the receiving opening 4 are relatively displaced about the axis, The insertion-side engagement fittings 12 and the reception-side engagement fittings 11 provided on the insertion opening 5 and the reception opening 4 contact each other, and the rotational reaction force is reliably transmitted to the adjacent pipes 3. As a result, relative displacement of the pipe 3 around the axial center is prevented, and a large frictional force with the soil is obtained to prevent rotation of the propulsion device itself. Further, since the pipes 3 can be bent between the insertion port 5 and the receiving port 4, the direction of the propulsion device can be easily corrected, and the curve propulsion method can be applied.

3 and 4 (a) and 4 (b) relate to another embodiment of the present invention, in which the engaging projection 21 that further projects along the axial direction at the tip of the insertion slot 5 is shown. Is formed, and an engaging recess 22 is formed at the rear end of the receiving port 4 so as to correspond to the engaging projection 21. Then, the insertion port 5 is inserted into the inside of the receiving port 4 so that the engaging convex portion 21 and the engaging concave portion 22 mesh with each other, and the pipes 3 are joined together.

In this configuration, when the cutter head is driven to exert a rotational reaction force on the joint portion of the pipe 3 and the insertion opening 5 and the receiving opening 4 are relatively displaced about the axis, The engaging projections 21 and the engaging recesses 22 provided on the insertion opening 5 and the receiving opening 4 contact each other, and the rotational reaction force is reliably transmitted to the adjacent tube 3. As a result, the relative displacement of the pipe 3 around the axis is prevented, and the frictional force with the soil can be increased to prevent the rotation of the propulsion device itself. Further, since the pipes 3 can be bent between the insertion port 5 and the receiving port 4, the direction of the propulsion device can be easily corrected and the curve propulsion method can be applied.

It should be noted that, in the above embodiment, the case where the receiving side engaging fitting 11 and the inserting side engaging fitting 12 or the engaging convex portion 21 and the engaging concave portion 22 are provided as one set is shown. Multiple sets may be provided. In addition, the structure of this pipe joint portion is used for a section where frictional force with the soil that prevents relative displacement of the pipe 3 around the axis is obtained, for example, for three or four pipes 3 connected immediately after the propulsion device. Applied.

[0016]

[Effect of the device]

 As described above, according to the present invention, the insertion opening and the receiving opening are provided with the engaging portions that abut each other when the insertion opening and the receiving opening are relatively displaced about the axis. By doing so, relative displacement around the axis can be prevented and the frictional force with the soil can be increased to prevent rotation of the propulsion device itself. Moreover, since the structure can be bent between the insertion opening and the receiving opening, the direction of the propulsion device can be easily corrected and the curving propulsion method can be applied.

[Brief description of drawings]

FIG. 1 is a sectional view showing a structure of a pipe joint portion for a propulsion method according to an embodiment of the present invention.

FIG. 2 is a plan view of an engaging fitting portion of the pipe joint portion for the propulsion method.

FIG. 3 is a perspective view of an insertion port of a pipe joint portion for a propulsion method according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a structure of a pipe joint portion for the same propulsion method.

FIG. 5 is a diagram showing a schematic configuration of a propulsion method.

FIG. 6 is a cross-sectional view showing a structure of a conventional pipe joint portion for a propulsion method.

[Explanation of symbols]

 1 Cutter Head 2 Propulsion Device 3 Pipe 4 Receptacle 5 Insertion Port 11 Receiving Side Engagement Metal Fitting 12 Insertion Side Engagement Metal Fitting 21 Engagement Projection 22 Engagement Recession

Claims (1)

[Scope of utility model registration request] 1. An insertion port at the tip of the other pipe is connected to the inside of a receptacle formed at the end of one pipe, which is connected to the rear of a propulsion device for excavating the ground while rotating the cutter head at the tip. A structure of a joint portion of a pipe that is laid along an underground path by being joined in series and propelled in an inserted state, wherein the insertion port and the receiving port are the insertion port and the receiving port. A structure of a pipe joint portion for a propulsion method, characterized in that engaging portions are provided to abut each other and prevent relative displacement around the axis when they are relatively displaced around the axis.