JP2600359Y2 - Pipe fitting for propulsion method - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for a propulsion method.

[0002]

2. Description of the Related Art As shown in FIG. 3, there is known a pipe joint used for a propulsion method in which a pipe is propelled and laid in the ground. In FIG. 3, reference numerals 1 and 2 denote an insertion port and a reception port of pipes connected to each other. An annular groove 4 for accommodating an annular sealing material 3 compressed between the inner peripheral surface of the receiving port 2 and the outer peripheral surface of the insertion port 1 is formed. A rear end surface 5 perpendicular to the tube axis direction is formed at the position of.

[0003] A flange 7 which can abut the end face 6 of the receptacle 2 is fixed to the outer peripheral surface of the insertion port 1 by welding at a proper distance from the tip of the insertion port and perpendicular to the pipe axis. Further, a plurality of ribs 8 for supporting the flange 7 are provided on the outer peripheral surface of the flange 7 opposite to the distal end of the insertion opening 1.
Are fixed at appropriate intervals in the circumferential direction of the tube. The rib 8 is used to reinforce the flange 7 when the insertion port 1 is inserted into the reception port 2 during the propulsion method and the flange 7 contacts the end face 6 of the reception port 1 to apply a propulsive force to the reception port 2. Things. 9 is an exterior concrete cast on the inner surface of the tube body.

[0004]

In the above arrangement, when the receiving port 2 is propelled by the insertion port 1, a flow of thrust F as shown in FIG.
The thrust is generated through the end face 6 of the receiving port 2, and the thrust is transmitted to the pipe wall of the preceding pipe. In this state, when propelling a curve,
When stress concentrates on the joint part at the time of, for example, an increase in thrust, the insertion portion A corresponding to the end face position of the rib 8 shown in FIG.

[0005] The present invention solves the above-mentioned problem. Even when stress is concentrated on the joint portion, the insertion portion A corresponding to the end face of the rib is not damaged by buckling or stepping of a curved portion. Accordingly, an object of the present invention is to provide a pipe joint for a propulsion method capable of improving the load-bearing capacity of a propulsion pipe.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is directed to a propulsion method having a flange provided on an outer peripheral surface of an insertion opening for pushing a receiving end surface and a rib for reinforcing the flange. In the pipe joint, a cushion material is mounted on the front end side of a flange provided on the outer peripheral surface of the insertion port, and a hard solid is mounted on a rear end face of the receiving port facing the front end of the insertion port.

[0007]

According to the above construction, when a thrust is applied, while the thrust is low, the thrust is transmitted to the receiving end face via the cushion material by the flange while the thrust is high. By contacting the hard tip with the hard tip, thrust is transmitted even by the tip of the insert, preventing the concentration of stress on the insert corresponding to the end face position of the rib. As described above, it is possible to avoid damage such as buckling or stepping out of the bent portion of the opening at the end face position of the rib.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a pipe joint for a propulsion method according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view for explaining its operation.
In FIGS. 1 and 2, the components denoted by the same reference numerals as those in the conventional example of FIG. 3 have the same functions, and the detailed description thereof will be omitted.

In FIG. 1, reference numeral 10 denotes a cushion material mounted on the end face of the flange 7 on the front end side of the opening. The thrust by the flange 7 is transmitted to the receiving end face 6 through the cushion material 10, and when the thrust increases, It is compressed by the receiving end face 6. Reference numeral 11 denotes a steel piece mounted on the rear end face 5 of the receptacle facing the distal end face of the insertion port 1. As shown in FIG. 1, an appropriate gap is provided between the steel piece 11 and the insertion distal end. When the cushioning material 10 is compressed due to a high thrust, the distal end of the insertion hole comes into contact with the steel piece 11 as shown in FIG.

With such a configuration, when a thrust is applied to the propulsion method pipe, while the thrust is low, the thrust is transmitted only from the flange 7 to the receiving end face 6 via the cushioning material 10. As the height increases, the cushion material 10 is compressed,
When the front end of the insertion comes into contact with the steel piece 11, thrust is transmitted also at the front end of the insertion, and the flow of thrust F
As shown in FIG. 2, there are two directions: a direction through the rib 8 and the flange 7, and a direction through the steel piece 11 from the insertion end. Therefore, it is possible to prevent stress from being concentrated on the flange 7, so that it is possible to avoid damage such as buckling of the curved portion at the insertion point A corresponding to the end face position of the rib 8 shown in FIG. .

[0011]

[Effect of the Invention] As described above, according to the present invention, when the thrust in the propulsion method pipe becomes high, the flow of the thrust occurs in the direction from the insertion port through the rib and the flange and the direction from the insertion end through the hard solid. However, it is possible to prevent stress from being concentrated on the flange as in the related art, and it is possible to avoid damage such as bending of a curved portion at the opening corresponding to the end face position of the rib or stepping.

[Brief description of the drawings]

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

FIG. 2 is a view illustrating the operation of the pipe joint for a propulsion method according to one embodiment of the present invention.

FIG. 3 is a sectional view of a conventional pipe joint for a propulsion method.

FIG. 4 is a diagram illustrating the operation of a conventional pipe joint for a propulsion method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insertion opening 2 Reception opening 3 Seal material 4 Annular groove 5 Reception end end surface 6 Reception end surface 7 Flange 8 Rib 10 Cushion material 11 Steel piece

Claims (1)

(57) [Scope of request for utility model registration] In a pipe joint for a propulsion method having a flange on an outer peripheral surface of an insertion opening for pressing a receiving end surface and a rib for reinforcing the flange, an insertion opening of the flange provided on the outer peripheral surface of the insertion opening is provided. A pipe joint for a propulsion method , wherein a cushioning material is mounted on the distal end side, and a hard solid is mounted on a rear end surface facing the distal end of the receptacle.