JPS6332234Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a pipe joint for a pipe for the propulsion method.

For example, as shown in FIG. 1, a conventional pipe joint of this type has a flange 3 welded to the outer surface of the socket 2 of the trailing pipe 1 and a rear end surface of the socket 5 of the leading pipe 4 to transmit thrust. was doing. However, in the process of propulsion construction, if the joint part bends due to soil quality or other reasons, it will be difficult to transmit thrust across the entire surface of the flange 3. A concentrated load will inevitably be applied to one side of the flange, which serves as the propulsion part, causing deformation of the pipe and damage to the welded part, which may interrupt normal construction. Furthermore, welding the flange 3 and the ribs 6 for reinforcing the flange requires a great deal of labor and materials, which is the biggest factor in increasing costs.

In the figure, 7 indicates a watertight rubber ring, and 8 indicates a mortar lining.

This idea eliminates the conventional drawbacks mentioned above,
To provide a pipe joint that can always transmit thrust over the entire surface of a propulsion part even if the joint part is bent to some extent, and that can significantly reduce costs by eliminating the need for welding work.

In order to achieve the above object, the pipe joint according to this invention has a ring attached to the distal end of the insertion port so that its rear end abuts, and a surface whose diameter is reduced inward in the distal direction on the outer surface of the ring. It is characterized in that an enlarged portion is formed on the inner surface of the socket, and has an outwardly enlarged surface that abuts against the diameter-reduced surface and receives the transmission of thrust.

The embodiments shown in the drawings will be described below.

In Fig. 2, 11 is a trailing pipe, and 14 is a leading pipe, both of which are made of cast iron pipes with a reinforced concrete exterior and an inlet 12 and a socket 15. It is designed to fit into the opening 15. A steel ring 16 is attached to the tip end surface of the socket 12 so that its rear end surface abuts. A tapered surface 16a whose diameter is reduced inward in the distal direction is formed on the outer surface of the distal end of the ring 16.
The inner surface of the socket 15 has a tapered surface 16a of the ring 16.
A widened portion 19 is formed with an outwardly widened tapered surface 18 that abuts against each other, and receives the thrust of the trailing tube 11 via the ring 16. It goes without saying that the tapered surfaces 16a and 18 may be replaced with curved spherical surfaces. Socket 15
A rubber ring 17 is disposed on the inner surface of the rear end so as to be in pressure contact with the outer surface of the insertion port 12, and the rubber ring 17
It is designed to maintain 14 degrees of watertightness.

Next, the operation of the above will be explained.

When the rear end of the trailing tube 11 is pushed in using a jack (not shown) or the like, the insertion port 12 of the trailing tube 11 comes into contact with the rubber ring 17 provided on the inner surface of the socket 15 of the leading tube 14 and expands into the expanded portion 19. Accordingly, the ring 16 that the front and rear end surfaces of the socket 12 are in contact with is also pushed forward, and the tapered surface 16a of the ring 16 is pushed forward.
comes into contact with the tapered surface 18 of the socket 15. After this, when the rear end of the trailing tube 11 is further pushed in, the tapered surface 18 of the socket 15 receives the thrust of the trailing tube 11 from the tapered surface 16a through the ring 16, and the leading tube 14 becomes the tube shown by the arrow. It will be moved in the axial direction, and a pipeline will be formed by sequentially adding pipes for the propulsion method. Therefore, during the propulsion, the tapered surfaces 16a and 18 always keep abutment on the entire surface within the range of the allowable bending angle θ, not only when moving straight but also when the joint portion is bent to some extent as shown in FIG. Therefore, no concentrated load is applied to the propulsion section formed by the tapered surface.

After the propulsion is completed, the ring 16 may be removed, for example, by fusing or the like. If removed in this manner, a large shrinkage margin will be obtained between the socket 12 and the socket 15, which is advantageous in terms of earthquake resistance.

FIG. 4 shows another embodiment of this invention, in which an enlarged part 29 with an outward vertical step 28 is formed on the inner surface of the socket 15 of the previous embodiment. A second steel ring 30 having a tapered surface 30a that abuts against the tapered surface 26a of the ring 26 is disposed at the corner of the stepped portion 28 of the second steel ring 30. Since the other parts are almost the same as those in the embodiment described above, similar parts are indicated by adding 10 to the reference numerals used in the embodiment described above, and the explanation thereof will be omitted. Further, the tapered surface 26
As in the previous embodiment, a curved spherical surface may be used instead of a, 30a.

Since this invention is constructed as described above, even if the joint part is bent to some extent, concentrated load on the propulsion part is avoided, and a large thrust can be withstood, and long-distance propulsion is sufficiently possible. Furthermore, since there is no need for welding of flanges, ribs, etc. as in the past, it is possible to significantly reduce costs, and the structure is simple and easy to manufacture.

[Brief explanation of the drawing]

Fig. 1 is an enlarged longitudinal sectional side view of a conventional device, Fig. 2 is an enlarged longitudinal sectional side view of one embodiment of this invention, Fig. 3 is a transverse plan view explaining the operation, and Fig. 4 shows another embodiment. It is an enlarged vertical side view. 11... Trailing pipe, 12... Inlet, 14... Leading pipe, 15... Socket, 16... Steel ring, 16a
... Tapered surface, 17 ... Rubber ring, 18 ... Tapered surface, 19 ... Expansion part.

Claims (1)

[Scope of utility model registration request] In a pipe for the propulsion method, which includes one tube with an insertion port formed at its tip and the other tube with a socket formed at the rear end that fits into the insertion port of this tube, a ring is attached to the tip surface of the insertion port. Attach so that the rear end faces are in contact with each other,
A surface whose diameter is reduced inward in the distal direction is formed on the outer surface of this ring, and an expanded portion is formed on the inner surface of the socket, which abuts against this reduced diameter surface and forms an outwardly expanded surface that receives the transmission of thrust. A pipe joint for pipes for the propulsion method, which is characterized by the following.