JPS5817976Y2 - Flexible protection device for underground pipes - Google Patents

Description

[Detailed description of the invention] This invention is designed to prevent damage to underground pipes, such as gas or oil transport pipes, when they are located in locations where they penetrate underground partition walls and are subjected to external pressure due to ground subsidence or other causes. This invention relates to a flexible protection device for underground pipes that prevents.

Underground pipes that are installed inside and outside the underground portion of a partition wall, penetrating the partition wall, are susceptible to elevation displacement in and out of the partition wall due to subsidence of the ground outside the partition wall due to various factors. When this occurs, the portion that penetrates the partition wall is affected by the displacement, and sometimes the underground pipe may be damaged due to excessive stress, and there is concern that an unexpected accident may occur due to leakage or release of the fluid inside.

Conventionally, attempts have been made to connect underground pipes to the section wall penetrating section using armrests or rotary joints to exclude the effects of ground subsidence from the section wall penetrating section. In addition, defects occurring in underground joints are difficult to detect, so this cannot be said to be an advantageous solution.

In this regard, by providing a long vertical opening in the underground part of the partition wall and installing piping so that the underground pipe passes through the upper part of the opening, it is possible to prevent ground subsidence to the extent that it corresponds to the gap of the vertical long opening. However, in this case, there is a problem in that rainwater, etc. that has passed through the above-mentioned gap infiltrates into the inner side of the partition wall.

The purpose of the present invention is to provide a flexible protection device for underground pipes that can advantageously provide sealing protection by attaching buttons to penetrating sections of partition walls without preventing the underground pipes from moving following ground subsidence. .

The present invention consists of a large-diameter cylindrical elastic body and a small-diameter cylindrical elastic body, which are connected to each other eccentrically by a rigid connecting member on the outside of the partition wall, by penetrating underground pipes through vertical openings in the partition wall. The inside of both of these elastic bodies is hollow, and the end of the large diameter cylindrical elastic body is connected to the outer surface of the partition wall to hide the vertical opening, while the small diameter cylindrical elastic body The length of the device in the axial direction can be increased by attaching the ends of the elastic bodies to the outer periphery of the underground pipe that is offset in the eccentric direction of both elastic bodies, and allowing the underground pipe to sink due to shear deformation of both elastic bodies. This makes it possible to allow underground pipes to sink a large amount without creating excessive stress on them.

Embodiments of the present invention will be described below based on the drawings.

In the figure, G is a partition wall, 2 is a long vertical opening provided in the underground part of the partition wall 1, and 3 is an underground pipe that penetrates the upper part of the vertical long opening 2 and extends to the inside and outside of the partition wall. .

In the present invention, the small diameter cylindrical elastic body 5 of the large diameter cylindrical elastic body 4 connected eccentrically is fitted to the outside of the underground pipe 3 extending in this way by buttoning on the outside of the partition wall 1.

Here, each elastic body 4, 5 is formed by embedding or joining planar rings 4b, 5b for connection at both ends of the elastic body 4at5a, and reinforcing rings 4c, 5c buried in the center thereof.

Further, the outer surface of each elastic body 4, 5 is provided with outer circumferential grooves 4d, 5d having an arcuate cross section, and these grooves 4d,
5d is the elastic body 4 when the elastic bodies 4 and 5 are deformed as described later.
．． It functions to prevent stress concentration and local loads from acting on the 5.

The connection between the elastic bodies 4 and 5 having different inner diameters is such that when the buried pipe 3 is placed at the top of the vertical opening 2 as shown in FIG. In view of the relationship with the direction of displacement of the tube, it is preferable to make them eccentric so that they come into contact at the same time.

In addition, this eccentric connection connects the irregularly shaped eccentric flange portion 6a of the rigid connecting member 6 having an inner diameter equal to that of the small diameter elastic body 5.
This is done by liquid-tightly tightening the planar rings 4b and sb by means of the rings 6b and 6b, respectively.

The ends of the elastic bodies 4 connected in this way are liquid-tightly connected to the outside of the partition wall 1 via a connecting member T having an inner diameter equal to that of the elastic body 4, and the vertically long opening 2 is connected by this connecting member 7.
to hide.

The connecting member 7 has a flange portion 7a having the same outer diameter, and one of the flange portions 7a is fastened to the elastic member 4 and the other to the partition wall 1 by bolts 7b.

On the other hand, in order to close the gap between the inner diameter of the elastic body 5 and the outer diameter of the buried pipe 3, an end plate 8 having a hole diameter equal to that of the buried pipe 3 is pressed against the end of the elastic body 5, and a packing 9 is placed on the outside of the end plate 8. The seal ring 10 is tightened through the .

It is also possible to join the end plate 8 to the outside of the tube 3 by welding or other method without using the packing 9 and the seal ring 10 here, and to tighten it directly to the elastic body 5 with the bolts 10aK.

With this configuration, in the event of ground subsidence,
The buried pipe 3 descends inside the vertically long opening 2 under the influence of downward force.

Due to this parallel descent of the buried pipe 3, the end plate 8 of the small-diameter cylindrical elastic body 5 receives a downward pressing force, and the elastic body 5 starts deforming downward from the right side portion in the figure.

As the buried pipe 3 continues to descend further, a large shearing force acts on the inside of each elastic body 4, 5 and the rigid connecting member 6, and when the buried pipe 3 reaches the lower end of the vertical long opening 2, the elastic bodies 4, 5
For example, while the connecting member 7 is deformed as shown by the imaginary line in the figure,
The vertical opening 2 is constantly hidden from the front and back of the descent of the tube 3.

Here, since the amount of deformation of the elastic bodies 4 and 5 is determined by the elastic links of the elastic bodies 4a and 5a and their wall thickness, the remaining gap 2
It is necessary to appropriately select elastic bodies 4 and 5 that can allow free movement of the buried pipe according to the size of a.

The present invention is not limited to this embodiment, but for example, if a larger movement of the buried pipe is to be allowed, the vertically long opening may have a larger vertical opening and the inner diameter may be changed sequentially. It is also possible to eccentrically connect three or more elastic bodies.

Moreover, each elastic body can also be directly connected without using a connecting member.

Therefore, according to the present invention, in the event of ground subsidence, the underground pipe can move within the vertical opening to its lower end, so that excessive stress is applied to the part of the pipe that penetrates the partition wall, and the underground pipe is not damaged. That's not it at all.

Further, since the end face of the large diameter cylindrical elastic body is connected to the partition wall and the end face of the small diameter cylindrical elastic body is connected to the buried pipe in a fluid-tight manner, water will not seep through the opening.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional side view showing an embodiment of the present invention, and FIG. 2 is an end view thereof. 1... Compartment wall, 2... Vertical long opening, 3... Underground pipe, 4... Large diameter cylindrical elastic body, 5... Small diameter cylindrical elastic body.

Claims (1)

[Scope of utility model registration request] Underground pipes extending through vertical openings in partition walls,
A button is placed on the outside of the partition wall, and is surrounded by a large diameter cylindrical elastic body and a small diameter cylindrical elastic body which are eccentrically connected to each other by a rigid connecting member, and the interior of both of these elastic bodies is hollow, and the large diameter cylindrical The end of the elastic body is connected to the outer surface of the partition wall to hide the vertically long opening, while the end of the small diameter cylindrical elastic body is attached to the outer periphery of the underground pipe that is offset in the eccentric direction of both elastic bodies. A flexible protection device for underground pipes.