JPH03119296A - Cut-off packing - Google Patents

Abstract

PURPOSE:To prevent water from leaking out due to lining a tunnel by forming a cut-off packing with the internal rubber of a water-expanding vulcanized rubber, the intermediate rubber of a non-expanding hard vulcanized rubber, and the external rubber of a non-expanding soft vulcanized rubber. CONSTITUTION:A cut-off packing 5 is formed with the internal rubber 2 of a water-expanding vulcanized rubber having a penetration hole 1, the intermediate rubber 3 of a ring-shaped non-expanding hard vulcanized rubber positioned on the outer periphery of the rubber 2, and the external rubber 4 of a non- expanding soft vulcanized rubber positioned on the outer peripheral side of the rubber 3. Then, a water-proof sheet 13 is penetrated with an anchor member 12 set into primary lining concrete 11, and the cut-off packing 5 and a metallic washer 14 are fitted on each other, and are pressed on the surface of the concrete 11 with a nut 15 via the water-proof sheet 13. As a result, with the respective actions of the rubbers 2, 3, 4 of three supports, water can be prevented extremely effectively from leaking out.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention can be used by being fitted into an anchor member that protrudes from tunnel lining concrete and penetrates a prevention sheet covering the surface of the concrete, for example. By attaching the water-stop gasket to the waterproof sheet with a nut or other means, it is extremely effective in preventing leakage or dripping of water that has reached the waterproof sheet from the concrete and is transmitted through the anchor parts. It is something to do.

(Prior Art) Conventional water-stop gaskets of this type include, for example, Japanese Patent Application Laid-open No. 54-108157 and Japanese Utility Model Application No. 59-15001.
These waterproof packings are disclosed in Japanese Patent No. 5, etc., and these water-stop packings are made by disposing an annular solid member that exerts a hoop effect around the outer periphery of a water-swellable material having a bolt through hole.

When this water-stop packing is put into use by fitting it into an anchor member and tightening it through a metal washer with a nut screwed onto the anchor member, the water-swellable material is Based on the fact that water that passes between the waterproof sheet and the anchor member is absorbed and expands, the flow of water that passes through the anchor member is dammed by the water stopper itself, thereby preventing leakage and dripping of water. It is said that this can be effectively prevented.

(Problem to be Solved by the Invention) However, in such conventional water-stop packing, the water-stopping effect cannot be effectively exerted until the water-swellable material is sufficiently expanded. At the beginning of the application of water seals, there was a problem that it was impossible to prevent water from leaking between the water seal and the tarpaulin sheet, and this was especially serious when the ground was very uneven.

On the other hand, from the early stage of application of waterproof seals, it is necessary to attach them to other uneven surfaces through waterproof sheets or other means.
When the nut is tightened strongly, the metal washer undergoes plastic deformation due to the tightening reaction force received from the outer solid member. Therefore, in addition to the water leakage mentioned above, water also leaks from between the water stopper and the metal washer. There was a problem that occurred.

Moreover, this water-stop gasket, especially its solid member, cannot be deformed to compensate for the inclination of the anchor member, so the anchor member is separated from the tunnel lining concrete by the fourth
When protruding at an angle as shown in the figure, on the outside of the inclination,
There was a problem in that a gap was created between the waterproof sheet and the water-stop gasket, and water leaked through the gap.

This invention advantageously solves the problems of the prior art, and almost completely prevents water from leaking or dripping between the waterproof sheet and the water-stop packing and between the water-stop packing and the metal washer. This provides a water-stop gasket that can

(Means for Solving the Problems) The waterproof packing of the present invention includes an inner rubber having a through hole, an intermediate rubber located on the outer peripheral side of the inner rubber, and an outer rubber located further on the outer peripheral side of the intermediate rubber. is integrally formed into a perforated disk shape, and the inner rubber is water-swellable vulcanized rubber.
The intermediate rubber is made of non-expandable hard vulcanized rubber, and the outer rubber is made of non-expandable soft vulcanized rubber.

(Function) When this water-stop packing is applied in the same manner as described in the conventional example, when the inner rubber made of water-swellable vulcanized rubber absorbs water and expands, the inner rubber expands in the radial direction outward. The expansion of the seal is advantageously restrained by the intermediate rubber made of non-expandable hard vulcanized rubber, and as a result, the water-stop seal expands radially inward and the anchor member into which it is fitted is restrained. In addition to fully contacting the circumferential surface of the male threaded part, regardless of the peaks or valleys, it also expands in the thickness direction and adheres to uneven ground and metal washers through waterproof sheets and other materials. Therefore, it can function to very effectively prevent water leakage through the anchor member, as well as water leakage between the water stopper and the waterproof sheet and between the metal washer.

In addition, Nakama rubber sufficiently supports the water expansion force of the inner rubber and improves the water-stopping effect as described above. For example, when placing secondary lining concrete on a waterproof sheet, By strongly pressing the sheet against the next layer of concrete with high rigidity, it effectively prevents the expansion of the through hole caused by the tension of the waterproof sheet, and more effectively prevents water leakage. function as expected.

Furthermore, the outer rubber made of non-expandable soft vulcanized rubber is particularly effective because it adheres precisely to the concrete surface, which is often an uneven surface, through the waterproof sheet when the water-stop gasket is normally tightened. can reliably prevent water from leaking between the water stopper and the waterproof sheet until the inner rubber is sufficiently expanded with water.
Therefore, plastic deformation of the metal washer caused by over-tightening of the water-stop gasket and, by extension, occurrence of other water leakage due to the deformation can be sufficiently prevented. In addition, this outer rubber has sufficient flexibility, even if the anchor member is tilted with respect to the concrete surface due to poor placement of the lining concrete or poor positioning of the anchor member. Due to the smooth deformation of the outer rubber in the outward direction of the inclination, the outer rubber can be brought into close contact with the waterproof sheet on each of the inside and outside of the inclination. Water leakage from between the sheet and the water-stop gasket can be sufficiently prevented.

Thus, according to the present invention, it is possible to almost completely prevent water from leaking through the anchor member, as well as from between the water-stop packing and the waterproof sheet and between the metal washer.

The above-mentioned effects of the present invention are particularly noticeable when the thickness of the outer rubber is made thicker than that of other rubbers.

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

FIG. 1 is a plan view and a sectional view showing an embodiment of the present invention, and this water-stop gasket, which has a disk shape with a hole in the center, has an inner rubber 2 having a through hole 1, and an inner rubber 2 having a through hole 1. 2
An intermediate rubber 3 having a ring shape located on the outer periphery of the intermediate rubber 3 and an outer rubber 4 also having a ring shape located further outside the intermediate rubber 3 are integrally formed.

Here, the inner rubber 2 is, for example, NR or NBR.

By a water-swellable vulcanized rubber, which can be SBR, CR, IR, IIR, the intermediate rubber 3 can also be a non-swellable hard vulcanized rubber, which can also be the same rubber as above. Preferably, the longitudinal elastic modulus is 50 kgf/cm
By using the above-mentioned hard vulcanized rubber, the outer rubber 4 can also be made of the same rubber as the above-mentioned rubber, more preferably a non-expandable soft vulcanized material having a modulus of longitudinal elasticity of 30 kgf/am or less. Each made up of rubber.

In the waterproof packing 5 having such a configuration, for example, when the inner diameter of the inner rubber 2 is set to 16φ, the inner rubber 2
The outer diameter of the intermediate rubber 3 can be 50φ, the outer diameter of the outer rubber 4 can be 70φ, and the thickness of these can be 70φ.
11111.

Such a water stop packing 5 is, for example, similar to the water stop packing described in the conventional example, in other words, as shown in the sectional view in FIG. is passed through the waterproof sheet 13 covering the surface of the concrete 11, and the water stop packing 5 and the metal washer 14 are sequentially fitted to the anchor member 12, and the water stop packing 14 is By tightening the nut 15 screwed into the anchor member 12, the anchor member is pressed against the concrete surface through the waterproof sheet 13, and is ready for use.

Here, the waterproof sheet 1 oozes out from the concrete 11.
When the water reaches the anchor member 12 and reaches the water stopper 5, the inner rubber 2 of the water stopper 5 expands inward in the radial direction and in the thickness direction due to the hoop action of the intermediate rubber 3. Then, on the external threaded surface of the anchor member 12,
It contacts sufficiently closely throughout its thickness, and also contacts tightly with the waterproof sheet 13 and the metal washer 14.

This prevents water from leaking or dripping between the anchor member 12 and the water seal 5, as well as water passing between the water seal 5 and the waterproof seam 3 and between the metal washer 14. The leakage and dripping of water is almost completely prevented by the inner rubber 2 of the water-stop gasket 5.

By the way, the intermediate rubber 3, which exerts a hoop effect on the inner rubber 2, strongly presses the waterproof sheet 13 against the concrete surface under its own rigidity, so that the waterproof sheet 13 acts on the concrete surface. Even if a tensile external force is applied within the installation surface, there is little risk that the through hole provided therein will be enlarged, and therefore the above-mentioned water-stopping function will be sufficiently maintained.

Furthermore, due to its flexibility, the outer rubber 4 can sufficiently follow the uneven surface of the concrete surface under the normal tightening condition of the water stopper, and can be applied to any part of the uneven surface.
Since it completely adheres to the waterproof sheet, it is especially suitable for waterproof seals 5 before the inner rubber has completely expanded with water.
It is possible to almost completely prevent water leakage between the nut 15 and the waterproof sheet 13, and therefore, the occurrence of water leakage caused by over-tightening the nut 15 can be sufficiently prevented.

In addition, when the water-stop packing 5 is applied to the anchor member 12 that is inclined with respect to the concrete surface, the outer rubber 4 is located at the angle of inclination where the amount of deformation becomes particularly large, as shown in FIG. It is elastically deformed from the side part to the outer part, and the gap between the waterproof sheet 13 and the waterproof packing 5 is effectively removed by the inclined outer part, so that there is also a sufficient seal between them. will be done.

(Effects of the Invention) As is clear from the above, according to the present invention, the inner rubber made of water-swellable vulcanized rubber,
Leakage of water that seeps out of the concrete and reaches the waterproof sheet under the respective action of the intermediate rubber made of non-intumescent hard vulcanized rubber and the outer rubber made of non-intumescent soft vulcanized rubber along the anchor parts. Water dripping and water leakage from gaps between the waterproof sheet and the water-stop packing and between the metal washer can be extremely effectively prevented.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an embodiment of the present invention, Fig. 2 is a sectional view showing an example of application of the water stop packing, Fig. 3 is a sectional view showing an example of the action of the water stop packing, and Fig. 4 is a sectional view showing an example of the application of the water stop packing. , is a sectional view showing an example of the action of a conventional packing. l...Through hole 2...Inner rubber 3...
Intermediate rubber 4...Outer rubber 5...Water stop gasket (a) Fig. 1(b) f-...1r 2--m-inside/1 go A 3-11 intermediate go A 4-- Outer Go A 5--One stop water l Satsukin Fig. 3 Fig. 4

Claims (1)

[Claims] 1. A water-stop packing integrally formed with an inner rubber having a through hole, an intermediate rubber located on the outer periphery of the inner rubber, and an outer rubber located further on the outer periphery of the intermediate rubber. A water-stop packing, wherein the inner rubber is made of water-swellable vulcanized rubber, the intermediate rubber is made of non-swellable hard vulcanized rubber, and the outer rubber is made of non-swellable soft vulcanized rubber.