JPS63125800A - Composite sealing member - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is applicable to composite seal members, such as joints of shield segments forming the peripheral wall of tunnels, joints of humid pipes, flanges of panel water tanks, and piping pipes. This invention relates to a composite seal member that is buried in a part of the gap between joints or connecting parts such as flanges, box culvert joints, joints of various concrete structures, etc. to close the gaps.

<Prior Art and its Problems> Conventionally, sealing members for closing gaps in structures include a single sealing member and a combination sealing member using a combination of a plurality of members. An example of a single seal member made of a single material is shown in Figures 13 and 14. The single sealing member 1 shown in FIG. 13 is partially embedded in the gap 4 between the joints 2a of the segments 2a, 2g forming the structure 2 before the structure 2 is constructed. The single sealing member 1 expands with water or the like and generates an expansion pressure P within the joint 2a. However, as shown in FIG. 14, a part of the structure 2 is provided with an opening 5, and the single seal member 1 protrudes from the opening 5 due to the expansion pressure P, producing a protruding portion 1a. There is a problem that the closing function (water-stopping property) of the joint portion 2a deteriorates.

Moreover, as the combination seal member 7, the Japanese Patent Publication No. 57-5.
Some of these are disclosed in Japanese Patent Application Laid-open No. 7773 and Japanese Patent Application Laid-Open No. 57-61077. These combined seal members 7 are a combination of a compressible elastic body 8 and an expandable uncrosslinked rubber 9, as shown in FIG. A part of the gap 4 of the joint portion 2a is filled. in this case,
The rubber that expands is uncrosslinked rubber 9, and because it has fluidity, an opening 5 is provided in the joint 2a, and when the opening 5 is created, the uncrosslinked rubber 9 is easily expanded by the expansion pressure P. It deforms and flows into the opening 5, producing a protruding portion 9a and reducing the inflation pressure P. For this reason, there is a problem that the closing function deteriorates and water-tightness cannot be obtained.

Therefore, the present invention provides a composite seal member that does not protrude even when there is an opening in a gap in a structure, maintains sufficient inflation pressure effectively, and maintains a high water-stopping ability. The purpose is to provide

(Means for Solving the Problems) The composite seal member of the present invention includes a seal member that is embedded in a gap in a structure and expands by absorbing liquid, and a seal member that is integrally adhered to a part of the seal member and is embedded in a gap in a structure and expands by absorbing liquid. The structure is characterized in that the sealing member absorbs liquid and expands while being restrained by the restraining member to close the gap between the structures.

Here, the term "structure" refers to a structure that is composed of a plurality of segments that have gaps between the joints that join the segments or between the connecting parts that connect the segments (for example, a tunnel that is composed of a plurality of shield segments), Alternatively, it may be composed of a single structure having a gap or a recess.

Further, the restraining member may be any flexible material such as vulcanized rubber, nonwoven fabric, canvas, blind fabric, etc., which is integrally adhered to the sealing member and restrains the expansion of the sealing member. In addition, non-woven fabrics,
Thin materials having water absorption or water permeability, such as canvas, blind fabric, and combinations thereof, are preferred. In this case, if it is thin, the amount of expanded rubber can be increased in a gap of the same thickness, and water absorption into the expanded rubber is faster, resulting in faster closing of the gap.

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

FIG. 1 is a diagram showing a first embodiment of a composite seal member according to the present invention. In FIG. 1, reference numeral 11 denotes a composite sealing member, and the composite sealing member 11 is a long strip-shaped body in the direction perpendicular to the paper surface, and is made of vulcanized strip-shaped expanded rubber (sealing member) 1.
2, and a vulcanized thin strip-shaped restraint rubber (restraint member) 14 which is laminated on the inflatable rubber 12 and vulcanized and adhered to both sides 12a of the inflatable rubber 12 to restrain the extrusion of the inflatable rubber 12. The expandable rubber 12 is made of a synthetic resin-based water absorbing material (for example, Sumikagel manufactured by Sumitomo Chemical), and is buried in the gap 4 having a substantially rectangular cross section in the long joint 2a of the two segments 2A and 2B that constitute the structure 2. 70%~7 when absorbing water
Inflate to 00%. Both sides 12a of the band-shaped expanded rubber 12
In this case, a thin strip-shaped restraining rubber 14 made of ordinary vulcanized rubber is firmly and integrally fixed to both side surfaces 12a so as to sandwich the inflatable rubber 12 using vulcanized adhesive or an adhesive. This adhesion will not peel or break due to expansion of the expandable rubber 12. The outer surface 14a of the restraining rubber 14 is in contact with the inner surface 2b of the joint portion 2a of the structure 2, and if necessary, is adhesively fixed to the inner surface 2b of the structure 2 with an adhesive (not shown). When the composite seal member 11 comes into contact with water 18, as shown in FIG. 2, the expansion rubber 12 absorbs the water 18 and expands, and while being restrained by the restraint rubber 14, attempts to expand by approximately 700%, resulting in a large expansion pressure P. is generated, expands and fills the gap 4 between the joints 23 following the shape of the inner surface 2b, and closes the joint 2a in a tightly sealed state.

Next, the effect will be explained.

Since the composite sealing member 11 of the present invention is provided with restraining rubbers 14 that are firmly and integrally vulcanized and bonded on both sides of the band-shaped inflatable rubber 12 to restrain the expansion of the inflatable rubber 12, the inflatable rubber 12 absorbs moisture. As shown in FIG. 2, a large expansion pressure P (indicated by an arrow in the figure) is generated to press the inner surface 2b of the joint 2a of the structure 2 and to protrude toward the opening 5. However, since both sides 12a of the inflatable rubber 12 are firmly and integrally vulcanized and bonded to the restraint rubber 14, and the restraint rubber 14 has strong elasticity, the adhesive interface between the inflatable rubber 12 and the restraint rubber 14 has a central part. A large shearing force (indicated by an arrow S on the outside of the restraint rubber 14 in the figure) acts toward the expansion rubber 12 and restrains the expansion rubber 12 from expanding toward the opening 5 side. That is, the rubber 12C near the interface of the expandable rubber 12 that adheres to the restraint rubber 14 is restrained in its expansion direction. Therefore, the expansion of the expandable rubber 12 is regulated to 300%, for example, and the expansion of the expandable rubber 12 is regulated to 300%.
2 has an expansion difference up to 700% expansion (700%-30
The inflation pressure P corresponding to
By continuing to press strongly, the closing function of the composite seal member 11 is maintained effectively.

Next, a second embodiment of the composite seal member according to the present invention will be described.

Figure 3.4 shows a second embodiment of the invention. Second
In the embodiment, the same components as in the first embodiment are given the same reference numerals, and the description thereof will be omitted. In the second embodiment, when two composite seal members 11 (one in the first embodiment) are buried in the gap 4 of the long joint 2a of the two segments 2A and 2B forming the structure 2. It is. The concave inner surface 2b of the joint 2a of each segment 2A (2B) has a fourth
As shown in the figure, a composite seal member 11 is bonded with an adhesive (not shown). The thickness Dll of the composite seal member 11 is slightly larger than half of the distance between the gaps 4 of the joint portions 2a of the structure 2. Therefore, as shown in FIG. 3, when two segments 2A12B are constructed, the outer restraining rubbers 14 abut each other to initially close the gap.

Further, the composite seal member 11 absorbs water 18 and the expandable rubber 1
2 expands, the inflatable rubber 12 expands while being restrained by the restraining rubber 14, maintains a high inflation pressure P, and has a long-term closing function.

In the above-mentioned embodiment, the case where the restraining rubber 14 was vulcanized and bonded to both side surfaces 12a of the inflatable rubber 12 was explained, but the present invention is not limited to this embodiment.
As in the third to fifth embodiments shown in Figures 7 to 7 (hereinafter, the same components as in the first embodiment are given the same reference numerals and detailed explanations will be omitted).
The restraint rubber 14 is provided on one side 12a of the inflatable rubber 12, and as shown in FIG. 6, the restraint rubber 14 may have a protrusion 14a, or as shown in FIG. The shape may be semicircular. Further, as in the sixth to eighth embodiments shown in FIGS. 8 to 10, the restraint rubber 14 is an inflatable rubber 12
It may have a side portion 14b that surrounds. Furthermore,
As in the 9.10 embodiment shown in FIG. 11.12, the restraint rubber 14 may be held inside the inflatable rubber 12.

As shown in FIG. 12, restraint rubber 14 may be provided inside and on the sides of the inflatable rubber 12. That is, the shape and arrangement may be such that the restraint rubber 14 restrains the expansion direction of the inflatable rubber 12 and the composite seal member 11 has a closing function.

(Effects) As described above, according to the present invention, even if there is an opening in the gap between the structures or an opening occurs, the composite seal member does not protrude, and the loss of expansion pressure is small and sufficient Able to maintain proper inflation pressure. In addition, the shape conforms well to the gap between the joints of the structure, the closing function for closing the gap between the joints is sufficient, and the water-stopping ability is high, resulting in a significant improvement in water pressure resistance.

[Brief explanation of the drawing]

FIG. 1.2 is a diagram showing a first embodiment of the composite seal member according to the present invention, FIG. 1 is a sectional view showing the state when it is buried in a gap in a structure, and FIG. FIG. Fig. 3.4 is a diagram showing the second embodiment of the present invention, Fig. 3 is a sectional view showing the expanded state buried in the gap of the structure, and Fig. 4 is a diagram showing the state shown in Fig. 3. A partial sectional view showing the state when buried, and FIGS. 5 to 12 are sectional views showing third to tenth embodiments of the present invention, respectively. 13 to 16 are diagrams showing the state of the conventional sealing member when in use, FIG. 13 is a cross-sectional view of the single sealing member when it is buried, and FIG. 14 is a cross-sectional view of the single sealing member when it is expanded. 15 is a cross-sectional view of the combined seal member when it is embedded, and FIG. 16 is a cross-sectional view of the combined seal member when it is expanded. 2... Structure, 2a... Joint, 4... Gap, 5... Opening, 11... Composite seal member, 12... Expanded rubber (sealing member), 14...
... Restriction rubber (restraint member), 18 ... Water, P ... Expansion pressure, S ... Shear force.

Claims (1)

[Claims] A sealing member that is embedded in a gap in a structure and expands by absorbing liquid, and a restraining member that is integrally adhered to a part of the sealing member and restrains the expansion of the sealing member, the sealing member absorbs liquid and expands. A composite seal member characterized in that it expands while being restrained by a restraining member and closes a gap in a structure.