JPH07279225A - Cut-off packing for precast concrete product - Google Patents

Abstract

PURPOSE:To obtain such a cut-off packing as setting seal operation between joint end faces of a precast concrete product member used for a box culvert, an agricultural waterway, a road side ditch, etc., can be simply and accurately accomplished. CONSTITUTION:A sponge rubber main body 1 having the bottom seal surface 12 opposed to the top seal surface 13 parallelly connected to the end face of a precast concrete product member to be connected is used. A hollow hole 11 is opened in the central part of the sponge rubber main body and, at the same time, both sides used for curved faces 14 are formed in a semicylindrical shape, and sticky isobuthylene-isoprene rubber layer 2 and 3 are respectively adhered to both sides used for the bottom seal surface 12 and curved faces 14 to form.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof packing for precast concrete products, including box culvert,
An object of the present invention is to provide a water blocking packing capable of easily and accurately achieving a set sealing operation between joint end faces of a precast concrete product member used for an agricultural waterway, a road gutter, or the like.

[0002]

2. Description of the Related Art As a sealing mechanism for precast concrete products used for box culverts, agricultural waterways, gutters for roads, etc., in Japanese Utility Model Publication No. 55-28673 and Japanese Utility Model Publication No. 56-15226, a joint material is fitted between the end faces. However, since the work for setting the joint material is complicated, it has been conventionally practiced to seal the joint end surface of the concrete product with a packing material such as butyl rubber or sponge rubber. There is. In particular, butyl rubber has been variously studied and adopted as an adhesive sealing means in permanent equipment because permeation adhesion progresses over time and a strong adhesive relationship is formed.

In contrast to the above-mentioned characteristics of butyl rubber, sponge rubber stops water by the elastic force of the material, and since a proper adhesive sealing action can be obtained from the beginning of setting, this is used as a seal packing material. Needless to say, various methods are adopted.

[0004]

[Problems to be Solved by the Invention]
No. 3 and Japanese Utility Model Publication No. 56-15226 are not easy to work for setting the sealing material, and the adhesion of butyl rubber progresses with time as described above. The rough surface structure of ordinary concrete products rather leads to strengthening of adhesive strength,
In addition, it can properly absorb product dimensional errors and obtain a seal structure with high waterproofness, but it is troublesome to handle because it is sticky and not stiff. In particular, when joining members, it is clear that an accurate fitting position cannot always be obtained if they are simply butted together, and once the joined state is reached, appropriate fine alignment can be obtained to obtain an appropriate centering relationship. However, this butyl rubber sealing material adheres to the end surface of the concrete product when it is first joined, and the sealing material comes off or twists during subsequent fine adjustment, and It is difficult to fit it in the end face position, and even if it is possible, the butyl rubber sealing material is deformed and the desired sealing action cannot be obtained.

On the other hand, the sponge rubber seal material stops water by the elastic force of the seal material, but deterioration of the material is unavoidable in the long term, and there is a disadvantage that the elastic force is lowered due to the deterioration of the material over time. Also, since it is difficult to follow the fine irregularities on the concrete surface, it is necessary to use a sealing material with a somewhat large cross-sectional structure, especially for the trowel finish surface of concrete, and it is sufficient There is a drawback in that a good sealing property cannot be obtained.

[0006]

SUMMARY OF THE INVENTION The present invention has been studied to solve the problems of the above-mentioned prior art, and by combining sponge rubber and butyl rubber in a specific relationship, the prior art as described above. The present invention succeeds in effectively solving the problem in (1) and is as follows.

(1) A sponge rubber body is provided as a pair of parallel bottom and top sealing surfaces to be joined to the end faces of a precast concrete product to be connected, and a hollow hole is formed in the center of the sponge rubber body. In addition, a waterproof packing for precast concrete products, characterized in that both side surfaces are formed into a semi-cylindrical shape with a curved surface, and adhesive butyl rubber layers are formed on both sides of the bottom sealing surface and the curved surface.

(2) The sponge-like main body formed as a curved surface is formed with engaging projections at the intermediate portions of both side surfaces, and an adhesive butyl rubber layer is adhered on the sealing surface side along the engaging projections. The water-stop packing for precast concrete products according to (1) above.

(3) The release paper to be peeled off at the time of use is adhered to the adhesive butyl rubber layer which is adhered and formed on both sides of the bottom seal surface and the curved surface, respectively. Water-stop packing for precast concrete products according to item 2).

(4) A water-expandable butyl rubber is used as an adhesive rubber layer adhered on both side surfaces of a curved surface, and the precast concrete product stop according to the above (1) to (3) is used. Water packing.

[0011]

[Operation] A sponge rubber main body is provided as a pair of parallel bottom sealing surface and top sealing surface to be joined to the end faces of the precast concrete product to be connected. A hollow hole is formed at the center of the sponge rubber main body and both sides are formed. By forming the surface as a curved surface in the shape of a horseshoe, a stable setting state can be formed on the bottom sealing surface, and a finely adjustable temporary joining state can be appropriately formed on the top sealing surface.

In the sponge rubber body as described above,
Adhesive butyl rubber layers were formed on both sides of the bottom seal surface and the curved surface, so that the adhesive butyl rubber layer adhered to the bottom seal surface should be set accurately and firmly to the end surface of one precast concrete product to be connected. Even if the top seal surface is joined to the end face of the other precast concrete product, or even if the joining is further advanced, the adhesive seal state will not be accurately formed, and fine adjustment will be made appropriately. To implement.

The sponge-shaped main body formed as a curved surface is formed with engaging projections in the middle of both side surfaces, and an adhesive butyl rubber layer is formed along the engaging projections on the top seal surface side to form a curved surface. Accurately position and set the adhesive butyl rubber layer on both sides so that even if the adhesive butyl rubber layer has a relatively narrow width, the adhesive butyl rubber layer drips when the other precast concrete product end surface is pressure-bonded as described above. Prevents displacement and promotes adhesion at appropriate design positions.

It should be noted that the adhesive butyl rubber layer formed along the engaging protrusions at the intermediate portions of both side surfaces as described above is set at an overlapping adhesive line to the end surface of the other precast concrete product as described above, which is stable. Form a watertight seal relationship. In particular, a hollow hole is formed in the center of the sponge rubber body, and the sponge rubber body has a semi-cylindrical shape to reduce the pressure on both sides of the adhesive butyl rubber layer, so concentrate on this adhesive butyl rubber layer portion. The stable crimping force acts to stabilize the adhesion between the precast concrete parts to be connected.

By attaching a release paper to be peeled off at the time of use to the adhesive butyl rubber layer which is formed on both sides of the bottom seal surface and the curved surface, it is possible to adhere to another object during loading or storage as packing. Prevent it. The packing material can be attached to the end surface of the concrete product either at the bottom sealing surface at the precast concrete manufacturing plant or at the construction site.For the adhesive butyl rubber layer on the curved surfaces on both sides, the height and displacement of the concrete product must be corrected. At the final pulling, the butyl rubber layer is bonded at once.

By using a water-swellable butyl rubber as an adhesive rubber layer formed by adhesion on both sides of a curved surface, a water-expandable butyl rubber is used to expand when exposed to water, thereby improving the watertightness and ensuring an appropriate water-stopping action. .

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Explaining the concrete embodiments of the present invention as described above with reference to the accompanying drawings, the present invention is a water-stop packing for precast concrete products used in box culverts, road gutters or agricultural waterways. 1 proposes a sectional structure as shown in FIG. That is, first, the main body 1 formed of sponge rubber has a hollow hole 11 penetrating the center thereof, and the bottom surface is a wide bottom sealing surface 12, and the top surface is about one fifth of the bottom sealing surface 12. A top sealing surface 13 having a width is formed, and both side surfaces of the sealing surface 13 are curved surfaces 14, 14 having a semi-cylindrical cross section.

In the present invention, an adhesive butyl rubber layer is formed by adhering to the sponge rubber body 1 as described above.
This adhesive butyl rubber layer is composed of the adhesive butyl rubber layer 2 at the bottom of the bottom sealing surface 12 and the adhesive butyl rubber layers 3 and 3 of the curved surface 14 described above, whereas the adhesive butyl rubber layer 2 is adhered to the entire wide bottom surface. The adhesive butyl rubber layer 3 is in the form of a narrow tape or ribbon adhered along the engaging projection 15 formed at the intermediate portion of the curved surface 14.

The above-described one of the present invention is set on the end face of the U-shaped concrete block according to JIS standard or the like. That is, in setting the end face of the concrete block, the adhesive butyl rubber layer 2 is used to bond the concrete block along the length direction of one of the end faces of the concrete block, and the bending corner portion of the end face is set along the bending direction. The sponge rubber body 1 can be bent and set accurately within the thickness range of the end surface of the concrete block.

When the product according to the present invention is applied to a concrete block having a closed cross section such as a box culvert or a tubular body, the sponge rubber body 1 is cut into a predetermined length as shown in FIG. Cutting end face 1a of
1a is abutted, and a separately prepared butyl rubber sheet 4 is encapsulated and adhered to the outer surface of the abutted portion to set the connection, whereby a water-proof packing layer connected in a ring shape can be formed.

Further, in the present invention, the partially vulcanized water-swellable butyl rubber can be adopted in place of the general unvulcanized type for the adhesive butyl rubber layers 3 and 3, in this way. As a result, it can absorb water and expand upon contact with water, and the water-stopping effect can be improved and the watertightness can be improved. In addition, since the engaging projection 15 as described above is pressed with a thick wall as sponge rubber when sandwiched between concrete parts to be connected, the engaging projection 15 also prevents water from stopping at that portion. The effect can be enhanced.

Generally, release paper or release paper 6 is applied to the surface of each of the adhesive butyl rubber layers 2 and 3 so that the adhesive butyl rubber layers 3 and 3 are adhered to other objects during sorting or handling. In addition, the adhesive butyl rubber layers 2 and 3 prepared with the release paper 6 attached thereto are prevented from expanding and deforming until they are bonded to the sponge rubber body 1. The sponge rubber body 1 is attached to the sponge rubber body 1 with a constant thickness and a constant width, and the butyl rubber is prevented from deteriorating due to ultraviolet rays and the like by being attached until the use. That is, by removing the release paper 6 at the time of use, an accurate adhesive action can be obtained in any case.

The above-mentioned engaging projections 15 are on the outside of the adhesive butyl rubber layer 3 when pressed by the end faces of the precast concrete which face each other to form a strongly pressed joint relationship, so that the water will be removed even if external water pressure acts. It is obvious that a sealing state that does not easily penetrate is formed, and the sealing property of the adhesive butyl rubber layer 3 is further enhanced.

[0024]

According to the present invention as described above, setting seals between joint end faces of precast concrete products used for box culverts, waterways for agriculture, gutters for roads, etc. can be easily and accurately included including fine adjustment operation. It is an invention that is industrially highly effective because it can achieve and maintain an effective water-tight seal.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an end face of a waterproof packing according to the present invention.

FIG. 2 is a partial perspective view showing an end joint portion when the end portions of the waterproof packing according to the present invention are joined into a ring shape to be used as a closed cross-section member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sponge rubber main body 1a Cutting end surface 2 Adhesive butyl rubber layer (wide width) 3 Adhesive butyl rubber layer (relatively narrow) 4 Butyl rubber sheet (for encapsulating connection part) 6 Release paper 11 Hollow hole 12 Bottom sealing surface 13 Top sealing surface 14 Curved surface 15 Engagement part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location E02B 9/06 E02F 5/10 F16L 1/038 E03F 5/04 A

Claims (4)

[Claims] 1. A sponge rubber main body is provided as a pair of parallel bottom sealing surface and top sealing surface to be joined to the end faces of a precast concrete product to be connected, and a hollow hole is formed in the central portion of the sponge rubber main body. A water-proof packing for precast concrete products, characterized in that both sides are formed into a semi-cylindrical shape with a curved surface, and adhesive butyl rubber layers are formed on both sides of the bottom sealing surface and the curved surface. 2. A sponge-shaped main body formed as a curved surface is formed with engaging projections at intermediate portions on both side surfaces, and an adhesive butyl rubber layer is adhered and formed along the engaging projections on the top seal surface side. The water-stop packing for precast concrete products according to claim 1. 3. The release paper to be peeled off at the time of use is adhered to an adhesive butyl rubber layer which is adhered and formed on both sides of the bottom seal surface and the curved surface, respectively. Water-stop packing for precast concrete products. 4. The water-stop packing for precast concrete products according to claim 1, wherein a water-absorptive butyl rubber is used as an adhesive rubber layer adhered and formed on both side surfaces having a curved surface.