JP2002004793A - Rubber gasket for tunnel segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber gasket for tunnel segment capable of giving stable water stopping ability between connected segments. SOLUTION: This is a rubber gasket for sealing a joint between segments 1 and 1 constituting the tunnel by forming an anchor portion 3 for fixing to the end face 2 of the segment 1 and a seal portion 4 creating a seal function by being compressed with the anchor portion 3 for fixing to the end face 2 of the segment 1 thereby constituting a stripped body of equal cross sections with an unified seal portion 4, with a rubber gasket for tunnel segment formed with a curved surface having an almost constant curvature for the whole of a contact surface 5 of the seal portion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber gasket for a tunnel segment for sealing a joint between segments constituting a tunnel.

[0002]

2. Description of the Related Art In tunnel construction by a shield method,
A tunnel wall is constructed by connecting a number of curved plate-shaped segments. In such construction, it is important to stop the spring water from entering the tunnel.
Various water-stopping rubber gaskets such as the rubber gasket 20 shown in FIGS. 2A and 4 are mounted on the end surface 2 forming the four sides of FIG. 2 or the end face of the segment 1 (hereinafter, referred to as a contact portion) 2 satisfies the water stopping function by being in close contact with the contact surface 21 of the rubber gasket 20 attached thereto.

[0003]

However, the conventional rubber gasket for the tunnel segment is not shown in FIG.
(A) and FIG. 4, the contact surface is formed in a plane, and if the planar contact surface is in contact with the contact portion over the entire surface, the contact surface has an extremely high water stopping function. If the connection of the segments is completed in a state where the rubber gasket is deformed due to the poor connection of the segments, the rubber gasket will have an extremely insufficient water stopping function, and the spring water will be drawn into the tunnel. Becomes Even if the rubber gasket settles in a good state due to the elasticity of the rubber gasket, damage to the rubber gasket due to the stress applied at that time is relatively large, and the essential water stopping function may be deteriorated. Also, even if the rubber gasket is settled in a good condition, the close contact between the planes is relatively poor in following the rotational displacement such as torsion. There was also a problem with the stability of the.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rubber gasket for a tunnel segment capable of providing stable water stopping between connected segments.

[0005]

SUMMARY OF THE INVENTION A rubber gasket for a tunnel segment according to the present invention, which has been made to solve the above-mentioned problem, is a rubber gasket for sealing a joint between segments constituting a tunnel. Anchors for fixing to the end surface and a seal part that performs a sealing function by being compressed are integrated to form a strip of equal cross section, and the entire contact surface of the seal part is composed of a curved surface with almost constant curvature And a lubricating layer is applied to the surface of the seal portion according to the situation.

[0006] The above-mentioned strip refers to a long object such as a string or a monofilament. The substantially constant curvature refers to a state in which the bending state does not change at an acute angle or the bending direction does not reverse. Also, the rubber referred to here is a material having a property of being deformed from a steady state by pressing and returning to a steady state when the pressing force is released, and which can sufficiently withstand the use environment. E with heat resistance and strength
Refers to materials such as PDM. Further, a material that is unlikely to cause modification such as hydrolysis or permanent distortion is desirable.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rubber gasket for a tunnel segment according to the present invention will be described below with reference to the drawings. FIG. 1 shows an anchor portion 3 for fixing to an end face of a segment 1 and a seal portion 4 which is compressed to perform a sealing function.
FIG. 3 shows an example of a rubber gasket forming a strip having an equal cross-section integrated with a gasket.

The cross section of the anchor 3 is a pair of legs 7, 7
Since the cross section of the leg portion 7 has a wedge shape extending toward the end, after the concrete as the segment main body is once cast in a form in which the anchor portion 3 is buried. There is no fear of falling off from the end face 2 of the segment 1, and the outline of the cross section of the legs 7, 7 is unified in parallel with the end face 2 of the attached segment 1 or downward (or downward). Therefore, even if air bubbles are generated between the legs 7,7, the air bubbles are easily led to another place, and the anchor portion 3 caused by the concentration of the air bubbles between the legs 7,7 is generated. Can also be prevented from leaking due to insufficient filling of concrete at the time.

The cross section of the seal portion 4 has an arch shape, and has a contact surface 5 formed of a curved surface having a substantially constant curvature. By making the ends 8, 8 of the contact surface 5 protrude laterally, for example, the rubber gasket is attached to the end surfaces 2, 2 of both segments 1, 1 which are connected to each other as shown in FIG. When the contact surfaces 5 and 5 of both rubber gaskets are brought into close contact with each other to achieve a water stopping function, segments 1 and 1 which are connected to each other to install and connect a new segment 1 are provided.
When the end faces 2 and 2 of the rubber gasket are slid facing each other, an area serving as a guide surface which assists sliding until the contact surfaces 5 and 5 of the rubber gaskets mounted on the both end faces 2 and 2 face each other. Are formed along the curved surfaces of the abutment surfaces 5 and 5 and are slid without being caught by each other, and provided on the end surfaces 2 and 2 of the two segments 1 and 1 which are connected by the elasticity of the seal portion 4. The sealing portions 4 and 4 of the rubber gasket thus smoothly and surely adhere to each other. This action prevents damage caused by interference with the unevenness due to the formation of a tenon on the end face 2 of the segment 1, and even if the damage is slight, the curved surface existing around the unevenness is prevented. By compensating the close contact state, it is possible to prevent the water stoppage from being greatly impaired.

On the other hand, the cross section of the seal portion 4 is shown in FIG.
In the case of using a rubber gasket 20 having a rectangular shape as described above and using the same connection structure, even if the chamfering is performed in the direction in which the segments 1 and 1 are slid, the rubber gasket 20 to be in close contact with each other is formed. The linear outline of the side edge of the cross-sectional shape promotes mutual interference and hinders smooth sliding between the rubber gaskets 20, 20. Even if the contact surfaces 21 and 21 of the rubber gaskets 20 and 20 provided on the end surfaces 2 and 2 of the two segments 1 and 1 which are connected by the elasticity of the seal portion are brought into contact due to the stress applied so far. In the event that the seal portion is damaged, the contact surfaces 21 and 21 of the seal portion are flat even if the damaged portion is slight, so that the surrounding compensatory function is Is likely to greatly impair the water stoppage without working.

In the seal portion and the anchor portion of the rubber gasket having a curved surface as the contact surface 5, a plurality of cavities 9 having the same cross section are formed in parallel over the entire length. The cavities 9 are such that the sealing part 4 is
It is provided so as to be suitably compressed at the time of connection, and to be stabilized in a shape capable of performing a reliable water stopping function at the time of completion of the connection work, and by adjusting the cross-sectional area and the shape of the cavity 9. The elasticity and the deformation / restoration direction of each part of the seal part 4 are appropriately adjusted. The seal part 4 and the anchor part 3 have sufficient physical strength by using an organic rubber as a material. In the example shown in FIG. 1 (b), a lubricating layer 6 is applied to the surface (mainly the contact surface 5) of the seal portion 4 which is likely to be exposed to the outside world in order to further enhance weather resistance. The lubricating layer 6 is made of a material such as hard silicon, urethane, and molybdenum that can enhance the lubrication of the contact surface 5 even if the lubricating layer 6 has a lower physical strength than the organic rubber. The rubber gasket having such a configuration has a contact surface formed of a curved surface having a substantially constant curvature as described above, so that stress from an object corresponding to the contact surface is further reduced, and the lubricating layer has a smooth surface. It will supplement the physical strength.

[0012]

As described above, when the rubber gasket for a tunnel segment according to the present invention is used, a satisfactory stop can be obtained even if the connection of the segments is completed in a state where the connection of the segments is not performed well and the rubber gasket is slightly deformed. The water function can be obtained, and the problem of drawing spring water into the tunnel is eliminated. Further, even if a stress due to interference with another segment or a gasket attached to the end face of the segment is applied to the gasket during the connection work, the entire contact surface of the seal portion has a substantially constant curvature. With the configuration having the curved surface, the damage applied to the rubber gasket is suppressed to a low level, and the water stop function provided from the time of manufacture is not deteriorated by the work of disposing the segments. Furthermore, since a curved surface is adopted as the contact surface, the followability to a rotational displacement such as torsion is relatively high, so that the stability of the water stopping function against vibrations caused by, for example, an earthquake or traffic of a vehicle can be improved. . In addition, by applying a lubricating layer, the lubrication of the contact surface is further enhanced, and higher practical effects can be expected.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a rubber gasket for a tunnel segment according to the present invention.

Fig. 2 (a) (b) (c) (d) (e) (f) (g)
(H) (I) (N) It is sectional drawing which shows the example of the rubber gasket for tunnel segments by this invention, and the conventional example (A).

3 (a), (b) and (c) are cross-sectional views showing examples of the arrangement of a rubber gasket for a tunnel segment according to the present invention.

4 (a), (b) and (c) are cross-sectional views showing examples of arrangement of a conventional rubber gasket for a tunnel segment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Segment 2 End surface 3 Anchor part 4 Seal part 5 Contact surface 6 Lubricious layer

Claims (2)

[Claims] 1. A segment (1, 1) constituting a tunnel
1) A rubber gasket for sealing a seam between 1), an anchor portion (3) for fixing to an end surface (2) of a segment (1) and a seal portion (4) which is compressed to perform a sealing function. A rubber gasket for a tunnel segment, wherein the rubber gasket for a tunnel segment has an integrated section having a uniform cross section, and the entire contact surface (5) of the seal portion (4) has a curved surface having a substantially constant curvature. 2. A rubber gasket for a tunnel segment according to claim 1, wherein a lubricating layer (6) is applied to a surface of said seal portion (4).