JPS6123114Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gasket used for watertight connection of underwater hollow structures such as submerged boxes for underwater tunnels.

Conventionally, as shown in FIG. 1, this type of gasket has a gasket body 7 having a trapezoidal cross-section with steeply inclined sides, and mounting flanges 2 are integrally provided on both sides of the bottom of the gasket body 7, and the top surface 8 of the gasket body 7 is provided with mounting flanges 2 on both sides of the bottom. It is known that a trapezoidal water stop ridge 9 with a small cross section is provided in the center of the pipe.

However, in the case of a gasket of this shape, when it is interposed between the hollow structures 10 and 11 and compressed by applying a compressive load H, in the initial stage of compression, the water stop ridges 9 with a small cross section are mainly used. Only the hollow structure 11 is compressed on the top surface 8 of the gasket body 7.
After the end faces of the two come into contact, the compressive resistance increases rapidly, and therefore even if a fairly large compressive load H is applied, a very large amount of compressive deformation cannot be obtained, resulting in the compressive characteristics as shown by reference numeral 1 in Figure 5. . Therefore, the conventional gasket is not suitable for a watertight connection when the distance between the end faces of the hollow structure changes significantly due to movement of the hollow structure, and the top surface 8 of the gasket body 7 Even if the distance between the end surfaces of the hollow structures 10 and 11 is slightly reduced after the end surfaces of the hollow structure 11 come into contact with each other, there is a problem in that an excessive axial force acts on the hollow structure.

The object of the present invention is to provide a gasket for water-stop connection to hollow structures that advantageously solves the above-mentioned problems.

The invention will now be explained in detail by way of illustrated examples.

2 and 3 show a rubber gasket according to an embodiment of the present invention, in which the bottom of the gasket body 1 is arranged to extend along the end face of the opening of one hollow structure. Mounting flanges 2 extending continuously in the longitudinal direction of the gasket body are integrally provided on both sides of the gasket body, and a narrow gasket body top portion 3 to be brought into contact with the end face of the opening of the other hollow structure disposed midway between a central plane 5 passing through the center of the bottom and perpendicular to the bottom surface 4 of the gasket body, and a side plane 6 passing through the edge of the bottom of the gasket body on the external water pressure side and perpendicular to the bottom surface 4 of the gasket body; Further, on the side of the gasket body 1 on the side where external water pressure is applied, there is a bottom surface 4 of the gasket body.
A steeply sloped side surface 12 on the bottom side having an inclination angle A and a gently sloped side surface 13 on the top side having an inclination angle B smaller than the inclination angle A are successively provided.

Further, on the side of the gasket body 1 on the inside side of the hollow structure, there is a steeply inclined bottom side surface 14 having the same inclination angle A as the steeply inclined bottom side surface 12, and a side surface with a smaller slope than the gently inclined top side surface 13. An intermediate gently inclined side surface 15 having an angle C and a gently inclined top side surface 16 having the same or almost the same inclination angle as the gently inclined top side surface 13 are continuously provided, and the mounting flange 2 further includes: A large number of through holes 17 are provided at equal intervals in the longitudinal direction of the flange. Further, the junction point 18 between the steeply sloped bottom side surface 12 and the gently sloped top side surface 13 and the joint point 19 between the steeply sloped bottom side surface 14 and the intermediate gently sloped side surface 15 are 1/1/2 of the height of the gasket body 1. The gasket body is located slightly deviated toward the top side from position 2, and furthermore, the gasket main body top part 3
is arranged slightly offset toward the center plane 5 from the center between the planes 5 and 6.

The line indicated by the symbol in FIG. 5 is the compression characteristic line of the gasket of the above-mentioned example, and it is clear that the gasket of the above-mentioned example has a considerably larger amount of compressive deformation when subjected to the compressive load H, compared to the conventional gasket. I understand.

In implementing the present invention, the junction point 18,
19 may be provided at a position of 1/2 of the height of the gasket body 1 or at a position slightly lower than that, and the top portion 3 of the gasket body may be provided on the flat surface 5, 6.
It may be provided at the center between them or at a position slightly offset toward the side plane 6 side.

FIG. 4 shows a state in which the gasket of the above embodiment is attached to an underwater hollow structure such as a submerged box, in which the bottom surface of the gasket main body 1 corresponds to the outer peripheral side surface of one of the opposing hollow structures 10. At the same time, the mounting flange 2 is tightened and fixed to the hollow structure 10 by the strip washer 20 and the bolt 21,
The outer circumferential end surface of the other hollow structure 11 is pressed against the top 3 of the gasket body.

According to the present invention, on the side of the gasket body 1 on the side where external water pressure is applied and on the side on the inside side of the hollow structure, a narrow gasket body is formed from the top 3 of the gasket body 1 toward both sides of the bottom of the gasket body in directions that move away from each other. Since a continuous inclined slope is provided, as the compressive load acting on the gasket body gradually increases, the amount of compressive deformation of the gasket body 1 also gradually increases, and therefore a large amount of compressive deformation can be obtained. Even if the distance between the end faces of the hollow structures changes relatively significantly due to expansion and contraction of a central plane 5 perpendicular to 4;
It passes through the edge of the bottom of the gasket body on the side where external water pressure acts and is disposed between the side plane 9 perpendicular to the bottom surface 4 of the gasket body, so that the gasket body 1 compressed between the hollow structures is When water pressure P is applied, the top 3 of the gasket body moves toward the central plane 5 centered around the center point of the bottom surface 4 of the gasket body.
Therefore, the pressure of the gasket main body top 3 against the end surface of the hollow structure can be increased by using the external water pressure, thereby further improving the water-stopping property. Can be done. In addition, since the resultant force S of the compressive load H and the external water pressure P acts toward the center of the bottom of the gasket body, the gasket body will not fall over even when the external water pressure is large, and therefore even in deep water. Effects such as being effective can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing a state in which a conventional gasket for watertight connection of structures is attached to a hollow structure. Fig. 2 is a longitudinal cross-sectional perspective view of a gasket for water-stop connection of hollow structures according to an embodiment of the present invention, Fig. 3 is an enlarged view of the outline of the gasket, and Fig. 4 is a hollow structure using the gasket. FIG. 5 is a vertical sectional side view showing a state in which the structure is watertightly connected, and is a comparison diagram of compression characteristics between a conventional gasket and a gasket according to an embodiment of the present invention. In the figure, 1 is the gasket body, 2 is the mounting flange, 3 is the top of the gasket body, 4 is the bottom surface of the gasket body, 5 is the center plane, 6 is the side plane, 10 and 11 are hollow structures, and 12 is the steeply sloped bottom side. side,
13 is a gently sloped side surface on the top side, 14 is a steeply sloped side surface on the bottom side, 15 is a middle gently sloped side surface, 16 is a gently sloped side surface on the top side, 17 is a through hole, 20 is a band-shaped washer, and 21 is a bolt.

Claims (1)

[Scope of utility model registration request] Mounting flanges 2 for the end face of one hollow structure are integrally provided on both sides of the bottom of the gasket body 1, and a narrow gasket body top 3 that comes into contact with the end face of the other hollow structure is attached to the bottom of the gasket body. A central plane 5 passing through the center of the gasket body and perpendicular to the bottom surface 4 of the gasket body, and a side plane 6 passing through the edge of the bottom surface of the gasket body on the external water pressure acting side and perpendicular to the bottom surface 4 of the gasket body; Continuous slopes are provided on the side of the body 1 on the side where external water pressure acts and on the side on the inside of the hollow structure, which slopes from the top 3 of the gasket body to both sides of the bottom of the gasket body, sloping in directions away from each other. A gasket for water-stop connections to hollow structures, characterized by: