JPS6347240Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a joint material that is buried in a concrete layer such as on the roof of a building or on a road surface to prevent cracks from occurring in the concrete layer due to expansion and contraction due to temperature changes in the concrete layer. This relates to joint fillers that can be used.

As is well known, in order to form a concrete layer on a rooftop, etc., concrete is poured on top of the waterproof layer, but cracks occur on the concrete surface due to expansion and contraction of the concrete layer due to seasonal temperature changes. , the joint material must be buried in a square pattern at appropriate intervals. Therefore, the joint material is required to have rigidity in order to improve joint alignment during construction, and to follow shrinkage of the concrete layer due to temperature changes after construction.

Conventional concrete joint fillers are known to be made of hard or soft plastic or rubber and molded into a frame shape, but hard ones fit well into the joints but do not have conformability, while soft ones have poor conformability. However, it has the disadvantage of poor joint alignment.

The present invention solves the above-mentioned drawbacks by using a rigid support as a core material to improve joint alignment, and by attaching cap strips made of vulcanized rubber or soft plastic to the top or side surfaces of the support. It is designed and manufactured so that the cap strip and the support are connected by coating, and the sides of the cap strip can be opened and closed freely. It is designed to fully follow contraction.

An embodiment of the present invention is shown in FIGS. 1 and 2, respectively, in which a rigid plastic support 1 having a desired width and height and having a two-legged pedestal cross section
In a long expansion joint material having a skeletal core material, a space 2 is provided inside the upper part of the support 1, and concrete is provided in contact with the outside of the upper part of the support 1 in substantially the same shape and directed outward. A vulcanized rubber comprising at least one hook-shaped projection 3 that anchors to a building frame, and a fitting projection 5 that engages with at least one engagement hole 4 provided in the opposing supporting body 1 facing inward. Alternatively, a cap strip 6 made of soft plastic is covered and fitted from the outside, and a non-vulcanized butyl rubber adhesive layer 7 is provided over both outer surfaces of the cap strip 6, while the support 1 It is characterized in that a beam-shaped elongated elastic body 9 having a substantially square cross section and acting as a buffer for expansion and contraction is fitted and held inside the lower legs 8.

That is, to explain the joint material of the present invention in more detail with reference to the drawings, 1 is a support made of hard plastic and constitutes the core material of the joint material, 2 indicates the space above the support body, and 2 indicates the space for reinforcement. Therefore, it is divided into two parts, or three parts as shown in Figure 2, depending on the shoji frame. Of course there is no space part 2.
may be a single unit. Reference numeral 6 indicates a cap strip made of vulcanized rubber or soft plastic, and hook-shaped protrusions 3 are provided outwardly at the lower ends of both sides. The fitting between the cap strip 6 and the support 1 is achieved by press-fitting the fitting protrusion 5 of the cap strip 6 into the engagement hole 4 of the support 1 against its elasticity, as shown in the drawing. You can do it by doing this. Conversely, the elasticity of the projection 5 itself allows the projection 5 of the strip 6 to be pulled out from the engagement hole 4 of the support 1 by pulling a little harder.

Further, both sides of the cap strip 6 can be opened and closed to some extent. Reference numeral 7 is a non-vulcanized butyl rubber adhesive layer, which has unique adhesive properties and has excellent adhesion to a wide range of materials such as ready-mixed concrete and mortar. Reference numeral 8 denotes both legs of the support body 1, which straddle a beam-like elongated elastic body 9. It itself has rigidity because it serves as a core material, and the elastic body 9 is fitted and held between both legs 8.

As described above, the joint material of the present invention is constructed as described above, so that the supporting body 1 and the engaging hole 4 can prevent the cap strips 6 from mating against shrinkage due to temperature changes in the concrete layer. Since it engages with the protrusion 5, the side surfaces of the connected cap strips 6 can open and close freely and can follow the contraction of the concrete layer. In addition, support 1
Because it has rigidity, it has the advantage of good joint penetration and good workability.

In addition, since the cap strip 6 itself can be easily attached and detached, it is possible to shift the cap strip 6 by a desired length from the support 1 at the joint of the joint material and cover the joint of the support 1 and the elastic body 9. , it is also possible to improve the water-stopping properties of the joint part.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG. 2 is a cross-sectional view showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Support made of hard plastic, 2... Space, 3... Hook-shaped projection, 4... Engagement hole, 5... Fitting protrusion, 6... Cap strip made of vulcanized rubber or soft plastic, 7...Non-vulcanized butyl rubber adhesive layer, 8...Both legs of support 1, 9...Beam-shaped elongated elastic body.

Claims (1)

[Claims for Utility Model Registration] An elongated expansion joint material whose skeleton core is a hard plastic support 1 having a desired width and height and having a two-legged pedestal-like cross section, the support 1 having a desired width and height. A space 2 is provided inside the upper part, and at least one hook-shaped protrusion 3 is provided in contact with the outer side of the upper part of the support body 1 and is anchored to a concrete frame that is substantially the same shape and faces outward, and a hook-shaped protrusion 3 that is anchored to the concrete frame facing inward. a fitting protrusion 5 that engages with at least one engagement hole 4 provided in the opposing support body 1;
A cap strip 6 made of vulcanized rubber or soft plastic is covered and fitted from the outside, and a non-vulcanized butyl rubber adhesive layer 7 is provided over both outer surfaces of the cap strip 6. On the other hand, a joint material characterized in that a beam-shaped elongated elastic body 9 having a substantially rectangular cross section for cushioning expansion and contraction is fitted and held inside the legs 8 of the lower part of the support 1.