JPH0218112Y2 - - Google Patents

Description

[Detailed explanation of the invention] Industrial application field This invention is applicable to land reclamation protection, land protection protection, wave protection protection,
This invention relates to a gasket for sealing between revetment blocks, etc., which completely prevents water and earth from flowing in or out from gaps formed between revetment blocks constituting river protection etc.

BACKGROUND ART Conventionally, as shown in FIG. 6, this type of packing has a cylindrical packing main body 2 made of an elastic material.
2, and a pair of protruding mounting seats 23, 23 integrally provided along the length direction on one side of the packing 21 (Utility Model No. 52-
(Refer to Publication No. 83218). And this Patsukin 21 is
As shown by the broken line in the same figure, it is forcibly made into a flat shape by removing the air inside it and closing both ends when it is manufactured. When the cylindrical packing is opened, the elastic force of the cylindrical packing causes it to bulge out to return to the state before flattening, and this multiple force seals the gap between the revetment blocks. However, in the case of the packing having this structure, the above-mentioned elastic restoring force is not necessarily sufficient, so there is a risk that the seal between the revetment blocks cannot be completely formed, especially when a change in the ground occurs.

Purpose of the invention This invention was made in view of the above points, and is designed to provide a constant, reliable seal over a long period of time, even if the revetment block expands and contracts due to changes in temperature, etc., or moves slightly due to changes in the ground. The purpose is to provide a patch skin that can maintain its effectiveness.

Structure and operation of the invention The packing according to this invention is a cylindrical composite packing made of an inner and outer double layer made of elastic material, and the inner layer is made of a water-swellable elastic material that expands in volume when water is injected into the cylinder. A reinforcing core material is provided in the outer layer or between both the inner and outer layers, and the cylinder is forced into a flat shape by removing air from the cylinder and closing both ends.

The elastic material constituting the inner and outer layers of the packing is usually natural or synthetic rubber, but may also be elastic plastic.

Before the upper end of the gasket is opened, the gasket is forced into a flat shape by removing air from the cylinder and closing both ends. Then, when the upper end is cut open and water is injected into the cylinder while it is placed between the seawall blocks, the gasket returns to its original state before flattening, that is, approximately cylindrical, due to its own elastic restoring force. An inner layer of water-swellable elastic material absorbs water and expands to press the outer layer outward. As a result, the outer layer is pressed firmly against the sides of the block. In this way, the gap between the pair of seawall blocks is completely sealed. Furthermore, if the cylinder is filled with sand before the internal layer swells, the sealing effect will be further enhanced.

A reinforcing core material is provided between the outer layer or both the inner and outer layers. This core material serves to prevent the outer layer from expanding excessively or distorting outward due to the expansion of the inner layer, and also deforms when the packing receives an external impact, impairing sealing performance. It plays a role in preventing worms. The seal may also have a longitudinal mounting seat on one side thereof. In this case, the gasket is fixed to the side surface of the block or the like in the seat.

The water-expandable elastic material has the property of absorbing water and expanding when a flat packing is placed between revetment blocks, its upper end is opened, and water is injected into the cylinder. For example, natural or synthetic rubber mixed with water-absorbing synthetic resin particles or powder is often used. The degree of expansion is appropriately adjusted in the range of 100 to 2000% by the blending ratio of the water-absorbing synthetic resin to the rubber.

Examples Examples of this invention will be described in detail below.

1 to 3, the packing 1 according to this invention is a cylindrical composite packing made of an inner and outer double layer made of rubber, and the cylindrical packing before flattening has an outer diameter of 68 mm and an inner diameter of 49 mm. The inner layer has a thickness of 5 mm and is composed of water-swellable rubber made by blending particles or powder of a water-absorbing synthetic resin (product name Sumikagel, manufactured by Sumitomo Chemical Co., Ltd.) with rubber.
It swells by 800% upon absorption of water. On the other hand,
The outer layer 3 is made of ordinary synthetic rubber and has a thickness of 3 mm. A reinforcing core material 4 made of fibers made of Teflon cord is provided between the inner and outer layers 2 and 3. The thickness of the core material 4 is 3 mm. The gasket with the above structure is forced into a flat shape by closing one end, drawing out the air from the other end with a vacuum pump, and then closing the other end, as shown in Figure 2. .

Next, the construction method using this packing will be explained.

The side part of the packing 1 is fixed with adhesive, bolts, etc. to one side of a precast concrete block 5 for a revetment wall produced in a factory.
Or put 1 pack on the frame during block manufacturing.
It is also possible to assemble the block 5 in the state when the packing is completed and manufacture the block 5 in that state so that the mounting of the packing 1 can be completed at the same time as the block 5 is completed. Attach the packing 1 to the block 5 using any of the above methods. In this way, Patsukin 1
The block 5 equipped with one side of the block is carried to the construction site,
Arrange this as follows. That is, as shown in FIGS. 1 and 2, block 5 and block 5
A gap 6 is formed between the blocks 5 and 5, and the blocks 5 are placed in such a manner that a gasket 1 is placed one by one in the gap 6.
The direction of each block 5 is determined and each block 5 is arranged.

After constructing the revetment wall with a large number of blocks 5 in this way, the upper end of the flat packing 1 is cut open,
Fill the cylinder with sand and then inject water. As a result, as shown in FIG. 3, the packing 1 returns to a substantially cylindrical shape due to its own elastic restoring force, and
The inner layer 2 swells, and its swelling force causes the outer layer 3 to swell.
strongly press against the side of block 5. In this way, the gap 6 between the pair of seawall blocks 5, 5 is completely sealed.

FIG. 4 shows the results of a compression test before and after swelling of the inner layer 2 of the packing 1 having the above structure. As is clear from the figure, the packing after swelling is 2.5 tons per 1 m at 60% compression.
It has a large compressive repulsion force of 4.0 kg per cm ² . This value is actually about 8 times the value of the packing before swelling.

FIG. 5 shows a modification of this invention.
In this case, the packing 11 for sealing the gap 16 is also made up of both inner and outer layers 12 and 13, and a plate-shaped mounting seat 19 is integrally provided on one side thereof in the length direction. Then, the packing 11 is attached to the block 15 with the pin 18 via the stay 17 at the seat portion 19.
is fixed to one side of the Further, the core material 14 is provided at the center of the thickness of the outer layer 13.

Effects of the invention As described above, the Patsukin created by this invention is
The inner layer is made of a water-swellable elastic material that expands in volume when water is injected into the cylinder, so by injecting water into the cylinder while it is placed between seawall blocks, the inner layer can be expanded. When swollen, the swelling force can force the outer layer into tight contact with the side surfaces of the block, etc., so that the gap can be completely sealed. In addition, by configuring the inner layer with water-swellable elastic material as described above, it is possible to significantly reduce the thickness of the packing compared to conventional packing made entirely of homogeneous elastic material. There is a big advantage in this respect as well.

In addition, since a reinforcing core material is provided in the outer layer or between both the inner and outer layers, the inner layer made of water-swellable elastic material expands in volume due to the injected water, thereby increasing the outer layer. It is possible to effectively prevent the gasket from expanding outward excessively or distortedly, and also to prevent the gasket from deforming and impairing its sealing performance when it receives an external impact.

Furthermore, since the packing according to this invention is a cylindrical composite product consisting of an inner and outer double layer, that is, a composite, both the inner and outer layers are integrated. Therefore, even if the inner layer made of water-swellable elastic material expands in volume due to water injected into the cylinder, it will not bulge in the length direction from both ends of the outer layer, so the expansion force of the inner layer will be reduced. There is no risk of the expansion force escaping in the length direction, and a large expansion force can be obtained by concentrating the expansion force outward in the radial direction.

Furthermore, the packing according to this invention is forcibly made into a flat shape by removing the air inside the cylinder and closing both ends, so even if the gap between the revetment blocks is narrow, the packing can be flattened in this gap. It is possible to insert the shaped seal without any trouble, and the seal construction can be carried out efficiently.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view of the packing before swelling;
The figure is an enlarged sectional view along the - line in Figure 1,
The figure is a cross-sectional view equivalent to Figure 2 after swelling, Figure 4 is a graph showing the relationship between compression amount and repulsive force, Figure 5 is a cross-sectional view equivalent to Figure 3 showing deformation of the packing, and Figure 6 is a conventional FIG. 3 is a cross-sectional view of the packing material. 1,11...Putskin, 2,12...Inner layer,
3,13...Outer layer, 4,14...Core material, 5,1
5...Block, 6, 16...Gap.

Claims (1)

[Scope of utility model registration request] It is a cylindrical composite packing consisting of an inner and outer double layer made of an elastic material.The inner layer is made of a water-swellable elastic material that expands in volume when water is injected into the cylinder, and the inner layer is made of a water-swellable elastic material that expands in volume when water is injected into the cylinder. A gasket for sealing between seawall blocks, etc., which is provided with a reinforcing core material and forced into a flat shape by removing air from the cylinder and closing both ends.