JPS623473Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention consists of a long plate body made of hard synthetic resin with vertical walls hanging near both sides of a horizontal plate and a cross section shaped like a square. In addition to forming a strip, an outer wall made of a soft synthetic resin is attached to the protrusion so that its upper and lower ends are located near the upper and lower ends of the vertical wall, and a cavity is formed between the vertical wall and the outer wall. This relates to a joint cutting material for concrete, which is fixed to the concrete wall and has a long base plate fitted between both vertical walls.

It is well known that joint cutting material is used as a cushion material to prevent cracks that occur due to expansion and contraction of concrete structures such as building rooftops and road surfaces due to changes in temperature.

However, since the joint cutting material commonly used in the past is simply a base plate fitted to the bottom opening of a long plate with a shaped cross section, it may move laterally near the bottom opening. In the upper part, because it is fixed to a horizontal plate, it cannot follow the expansion and contraction of the concrete surface, and as a result, a gap is created between the concrete surface and the joint cutting material, and dust and rainwater can enter into this gap. This was used to correct problems such as cracks in the concrete surface and rain leaks.

The present invention has been improved in this respect, and the present invention will be explained below based on the drawings. Fig. 1 is a perspective view of the proposed product, and Fig. 2 is a cross-sectional view of the same. Vertical walls 2 are suspended near both sides of the plate 1, and protrusions 3 are formed along the longitudinal direction on the outer wall surface of the vertical walls 2 of the elongated plate body A made of a hard synthetic resin having a cross-section shape. An outer wall B made of soft synthetic resin is provided on the protrusion 3, the upper and lower ends of which are located near the upper and lower ends of the vertical wall 2, and a cavity 4 is formed between the vertical wall 2 and the outer wall B. This is a joint cutting material for concrete which is fixed as shown in FIG.

FIG. 3 shows a sectional view of another embodiment of the present product, and the outer wall B may have an arcuate or linear cross section, but the outer wall B is formed by composite extrusion etc. are fixed to the protrusion 3, and the upper and lower ends of the outer wall B are located near the upper and lower ends of the vertical wall 2 so that a cavity 4 is formed between the vertical wall 2 and the outer wall B. It is molded as follows.

It is preferable that the protrusion 3 is formed integrally with the substantially central part of the outer surface of the vertical wall 2 as shown in the drawing, and the base C is made of a material that is expandable and contractible in the width direction, such as polyurethane foam. It is preferable to use a rectangular object, and a locking piece (not shown) consisting of a protruding strip along the longitudinal direction is provided on the outer surface of the outer wall B to ensure good bonding with the poured concrete surface. It may be provided.

Since the present invention has the above-mentioned configuration, when it is used, it is laid at a predetermined interval on the waterproof sheet b stretched over the slab concrete a, as shown in Fig. At the same time, the degree of fitting between the elongated plate A and the base plate C is adjusted, and the holding concrete c is poured and hardened.

As the concrete surface expands and contracts as the temperature changes, the vertical wall 2 moves accordingly, and the outer wall B made of soft synthetic resin forms the cavity 4 using the protrusion 3 as a fulcrum. This prevents the formation of voids due to the separation of the joint cut material and the concrete surface, since it moves freely up and down and left and right following the expansion and contraction of the concrete surface, and the upper and lower ends of the outer wall B are vertical walls. Since it is located near the upper and lower ends of the cavity 2, there is no reduction in the expansion and contraction absorption function due to dust entering the cavity 4, and there is no damage due to freezing of rainwater flowing in, and the concrete surface is The elastic and absorbent function can be maintained for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the present product, FIG. 2 is a sectional view of the same, FIG. 3 is a sectional view of another embodiment, and FIG. 4 is a sectional view showing the same as the above embodiment. A...long plate body, B...outer wall, C...base plate,
1...Horizontal plate, 2...Vertical wall, 3...Protrusion, 4...
...Cavity part.

Claims (1)

[Scope of claim for utility model registration] (1) Cross section with vertical walls suspended near both sides of the horizontal plate
A protrusion along the longitudinal direction is formed on the outer wall surface of the vertical wall of the elongated plate made of hard synthetic resin, and an outer wall made of soft synthetic resin is attached to the protrusion, the upper and lower ends of which are vertical. Concrete that is located near the upper and lower ends of the wall and fixed so that a hollow part is formed between the vertical wall and the outer wall, and a long base plate is fitted between both vertical walls. Joint cutting materials. (2) Utility model registration claim No. 1 in which the protrusion is integrally formed approximately at the center of the outer wall surface of the vertical wall
Joint cutting material for concrete as described in section. (3) The joint cutting material for concrete according to claim 1, wherein the base plate is a rectangular material that is expandable and contractible in the width direction, such as polyurethane foam.