JPH0630593U - Pipe joint for propulsion method - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a pipe joint for a propulsion method capable of imparting an appropriate bending to the joint portion while securing a sufficient sealing surface pressure. [Structure] End face 19 of receptacle 9 of first tube 8 and second tube 1
The elastic body 2 is provided in the body-attached gap with the end surface 20 of the exterior part provided in 0.
1 is installed in a compressed state.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

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

[0002]

[Prior art]

 Conventionally, in propulsion work, the insertion opening formed in the second pipe is inserted into the receiving opening formed in the first pipe, and the tip end surface of the insertion opening is brought into contact with the back end surface of the receiving opening to receive the receiving end. A propulsion method is known in which these pipes are propelled into the ground by transmitting propulsive force between the mouth and mouth. At this time, a general method is to install a front pipe at the head of the pipe, and use this front pipe to propel the pipe while excavating and correcting the direction. The propulsion method pipe used in this propulsion method has the structure shown in FIG.

In FIG. 3, reference numeral 1 denotes a cast iron pipe main body having a receiving port 2 formed at one end thereof and an insertion port 3 formed at the other end thereof. The insertion port 3 of another pipe 1 is inserted into the reception port 2 of a certain pipe 1, and the tip end surface of the insertion port 3 contacts the rear end surface of the reception port 2 as shown in the drawing, so that the reception port 2 is inserted from the insertion port 3 side. The driving force is transmitted to the side. An annular sealing material 4 is arranged in a compressed state between the receiving opening and the receiving opening.

The outer periphery of the tube body is covered with an external material 5 except for the part of the insertion port 3 which is inserted into the receiving port 2 of another pipe 1. The outer material 5 is formed so that the outer diameter thereof is equal to the outer diameter of the receiving port 2 to prevent generation of propulsion resistance due to the existence of the receiving port 2. The exterior material 5 is composed of an exterior lining layer 6 formed of a mortar material that covers the outer periphery of the pipe body 1, and an exterior plate 7 formed of a thin-walled steel pipe material that further covers the exterior lining layer 6. .

[0005]

[Problems to be solved by the device]

 However, in the above-mentioned propulsion method pipe joint, if the surface pressure of the sealing material is increased in order to enhance the water blocking function, etc., there is a problem that the joint part becomes difficult to bend and direction correction becomes difficult. It was

Therefore, the present invention solves such a problem, and provides a pipe joint for a propulsion method capable of imparting an appropriate bending to the joint portion with a simple structure while securing a sufficient sealing surface pressure. The purpose is to do.

[0007]

[Means for Solving the Problems]

 The present invention inserts the insertion opening formed in the second tube into the receiving opening formed in the first tube, and transmits the propulsive force between the receiving opening and inserts these tubes into the ground. In the pipe joint for propulsion method for propelling inward, an elastic body was installed in a compressed state in the body-attached gap between the end face of the receiving end of the first pipe and the end face of the exterior part provided on the second pipe. It is a thing.

[0008]

[Action]

 According to such a configuration, the elastic body is installed in a compressed state in the body-attached gap between the end surface of the receiving opening of the first tube and the end surface of the exterior portion provided on the second tube, thereby providing the elastic body. Pushes both end faces with the force of stretching, and when the pipe bends, this force acts as a force to widen the gap between both end faces outside the bend. As a result, it is possible to bend the joint of the pipe for propulsion method to an appropriate degree, and it becomes easier to correct the direction during propulsion construction.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show cross-sections of the main parts of a pipe joint for a propulsion method based on this proposal. Here, 8 is a first tube, and a receiving port 9 is formed at the open end thereof. A second pipe 10 is connected to the first pipe 8, and an insertion port 11 to be inserted into the receiving port 9 is formed at the open end of the second pipe 10. Exterior parts 12 are formed on the outer circumferences of the tubes 8 and 10 to make the outer diameters of the tubes 8 and 10 uniform over the entire length in order to reduce propulsion resistance. The exterior portion 12 has a mortar layer 13 formed on the outer circumferences of the tubes 8 and 10, and an exterior steel plate layer 14 covering the outer circumferences of the mortar layer 13.

A rear end surface 15 is formed inside the receiving opening 9, and a propulsive force can be transmitted from the inserting opening 11 toward the receiving opening 9 by hitting the rear end surface 15 with the tip end surface 16 of the insertion opening 11. Has been done. A receiving side annular groove 17 is formed on the inner periphery of the receiving port 9 on the opening side of the inner end face 15, and an annular rubber seal material 18 is arranged in a compressed state between the receiving side annular groove 17 and the outer periphery of the insertion port 11. ing.

An annular elastic body 21 is installed in a compressed state on the outer peripheral surface of the insertion opening 11 between the end surface 19 of the receiving opening 9 and the end surface 20 of the exterior of the insertion opening 11. With such a configuration, at the time of propulsion construction, the sealing material 18 is mounted inside the already installed receptacle 9 of the first pipe 8 so that the exterior portion of the outer peripheral surface of the insertion port 11 of the second pipe 10 is covered. With the elastic body 21 attached to the end face 20, the insertion port 11 is inserted into the receiving port 9. The insertion port 11 passes through the inner peripheral surface of the sealing material 18, and its tip end surface 16 contacts the rear end surface 15 of the receiving port 9, which enables transmission of propulsive force as shown in FIG. Moreover, the elastic body 21 is in a compressed state.

FIG. 2 shows a state in which the pipe is bent, and the pipes 8 and 10 are bent so that a gap 22 between the end face 19 of the receiving port 9 and the end face 20 of the exterior portion on the side of the insertion port 11 is formed outside the bending. When it becomes large as indicated by a in the figure, the extension force of the elastic body 21 works to help the expansion of the gap 22. As a result, the sealing material 18 having a desired surface pressure is further compressed by the amount required for bending. Inside the bend, the elastic body 21 hardly contracts as indicated by b in the figure. As a result, it is possible to give an appropriate bend between the first pipe 8 and the second pipe 10, and it becomes easy to correct the direction during propulsion construction. As the elastic body 21, rubber or spring is used.

[0013]

[Effect of device]

 As described above, according to the present invention, since the elastic body is installed in a compressed state in the body-attached gap between the first pipe and the second pipe, when the pipe is bent, the gap between the end faces of both pipes is provided outside the bend. Since it works to help expand the gap, it is possible to give the joint of the propulsion method pipe a greater degree of freedom than before while ensuring a seal surface pressure that is almost the same as before, and it is easy to orient during propulsion construction. Corrections can be made.

[Brief description of drawings]

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

FIG. 2 is a view showing a bent state of the pipe joint for the propulsion method.

FIG. 3 is a cross-sectional view of a conventional propulsion method pipe.

[Explanation of symbols]

 8 First Pipe 9 Receptacle 10 Second Pipe 11 Insertion Port 19 End Face 20 End Face of Exterior Part 21 Elastic Body

Claims (1)

[Scope of utility model registration request] 1. A second member is provided inside a receptacle formed in the first pipe.
In the pipe joint for the propulsion method for propelling these pipes into the ground by inserting the insertion ports formed in the pipes and transmitting the propulsive force between the receiving ports, the first pipe receiving port A pipe joint for a propulsion method, wherein an elastic body is installed in a compressed state in a body-attached gap between an end face of the body and an end face of an exterior portion provided on the second pipe.