JPH0146641B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a concrete layer that uses a joint cutting material that is buried in the roof of a building, on a road surface, or other concrete layer to prevent cracks from occurring due to temperature changes due to seasonal changes. This relates to the construction method.

As is well known, in order to form a concrete layer, a waterproof layer is provided on the upper surface of a concrete slab, and concrete is poured on the upper surface of the waterproof layer. However, due to seasonal changes in temperature, countless cracks occur on the concrete surface due to expansion and contraction, so in order to prevent cracks from occurring, it is necessary to bury joint cutting materials in the form of squares at appropriate intervals.

Therefore, as a joint cutting material, it should be at the same height as the thickness of the concrete layer, ensuring that the left and right concrete layers separated by the joint cutting material are separated, and that the boundary between the joint cutting material and the concrete layer is in close contact with each other. The concrete layer must not crack even if the concrete layer expands and contracts due to temperature changes, and it must also be easy to construct.

There have been various proposals as joint cutting materials for concrete. In Japanese Utility Model Publications No. 53-35932 and Japanese Utility Model Publication No. 54-1124, the applicant proposed joint cutting material for concrete in which an upper frame and a lower frame are attached above and below a long elastic material. However, since the upper and lower frames are made of hard or semi-hard synthetic resin, rubber, etc., it is difficult to respond to the expansion and contraction of the concrete layer due to temperature changes, and cracks occur between the frame material and the concrete layer. This can easily cause leaks and damage.

On the other hand, there is also a method of directly burying an elastic material made of foamed synthetic resin material and closing the gap with the concrete layer with a filler such as molten asphalt or urethane resin. However, if the filler is directly injected into the elastic material, the elastic material will shrink due to the heat and components of the filler. This shrinkage is so slight that it is difficult to detect at the time of construction, but after construction, the surface of the filler becomes depressed. For this reason, it is necessary to repair it again after construction, which is time-consuming. Furthermore, since the elastic material contracts due to changes in heat or chemicals, its elasticity becomes weak, and the elastic material is no longer able to absorb the expansion and contraction of the concrete layer due to temperature changes. For this reason, cracks are likely to occur at the boundary between the elastic material and the concrete layer, causing rain leakage and damage.

The present invention was proposed in view of the above, and since a protective material having chemical resistance, heat resistance, and heat insulation properties is provided on the upper surface of the elastic material, the filler does not come into direct contact with the elastic material. There is no risk of the elastic material losing its function.

To explain the embodiment in the drawings below, reference numeral 1 is a concrete slab serving as the basis of the concrete layer, a waterproof layer 2 is formed on the upper surface of the concrete 1, and joint cutting materials are formed in squares at appropriate intervals on the upper surface of the waterproof layer 2. Install 3.

As shown in FIGS. 2 and 3, the joint cutting material 3 has an intermediate material 5 having heat insulating properties on the upper surface of the vertically elongated elastic material 4.
and a surface material 6 having chemical resistance and heat insulation properties to form a long partitioning material 8, and a long upper frame material extending in the height direction at the upper end of the partitioning material 8. 9 is coated.

The elastic material 4 is a long material with a vertically elongated rectangular cross section, and is molded from foamed synthetic resin, soft rubber, or the like.
Then, a thick intermediate material 5 made of a heat insulating soft rubber or the like is adhered to the upper surface of the elastic material 4 along its length. Furthermore, a surface material 6 made of chemical-resistant and heat-resistant vinyl chloride or polyester in the form of a thick tape or thin plate is adhered to the upper surface of the intermediate material 5.

In the embodiment shown in FIG. 2 or 3, a double-sided adhesive tape 10 is adhered to the upper surface of the elastic material 4, an intermediate material 5 and a surface material 6 are provided on the upper surface of the tape 10, and the elastic material is 4 and the protective material 7 are integrally bonded.

FIG. 4 shows another embodiment of the partition material, in which a material having chemical resistance, heat resistance, and heat insulation properties is formed into a thick plate to form a protective material 7', and the protective material 7' is made of an elastic material. 4' is integrally adhered to the upper surface of the partition member 4' either directly or via an adhesive tape 10' to form a long partition member 8. According to this embodiment, since the protective material 7' can be formed into a single layer, manufacturing of the partition material becomes extremely simple.

The above-mentioned upper frame member 9 is a long member with a vertically elongated downward U-shaped cross section, and support pieces 12, 12 are provided inwardly on the inner surface midway between the heights of the left and right legs 11, 11. A hollow portion 13 is formed inside the tube and extends in the longitudinal direction. The upper frame member 9 is integrally molded from elastic soft or semi-hard synthetic resin, and the upper end of the partition member 8 is connected to the leg portions 11 of the upper frame member 9,
１１Install with the lower end clamped.

Since the joint cutting material 3 of the present invention is made as described above, in order to construct a concrete layer using the joint cutting material 3, a waterproof layer 2 is placed on the top surface of the concrete slab 1 as shown in FIG. The joint cutting materials 3 are placed on the waterproof layer 2 in a grid pattern at appropriate intervals, and the mortar 14 is placed to cover the side surfaces of the partition materials 8 and hardened.

When the mortar 14 hardens, the joint cutting material 3 is fixed, so concrete is poured into the interior partitioned by the joint cutting material 3 to form a concrete layer 15 (FIG. 5a).

Incidentally, it is preferable to apply a release agent to the outer surface of the upper frame 9 before concrete is poured.

After the concrete has hardened, the upper frame member 9 of the joint cutting material 3 is removed (FIG. 5b). When the upper frame member 9 is removed, a long groove-shaped space 16 is formed along the length of the upper surface of the partition member 8 and surrounded by the left and right concrete layers 15 and the surface of the protective member 7 of the partition member 8. A waterproof filler 17 is injected into the space 16 and hardened (FIG. 5c). As the filler 17 hardens, a long filler layer is formed in the space 16.

As the filler 17, molten asphalt or a solution of urethane resin caulking agent is used. Although molten asphalt is hot,
Since the protective material 7 is provided on the contact surface with the asphalt, the elastic material 5 is not directly heated at a high temperature due to the heat insulating effect of the protective material 7, and does not melt or shrink due to heat.

Furthermore, even when using a caulking agent in the form of a solution, since the protective material 7 is provided on the contact surface, the components of the caulking agent will not directly adhere to or penetrate into the elastic material 5, and the elastic material 5 will be protected. It will not melt or shrink in response to chemicals.

Therefore, since the filler surface is not depressed, the thickness of the filler layer and the concrete layer 15 can be made uniform, and the surface of the concrete layer 15 can be finished flat after construction. .
Moreover, since the filler layer can be provided in close contact with the left and right concrete layers 15, rainwater will not enter inside, and since the lower surface of the elastic material 4 is in contact with slab concrete, etc., each concrete layer 15 can be reliably disconnected.

As is clear from the above, according to the present invention, the space for injecting the filler along the partition material can be formed by simply removing the upper frame after concrete is poured, which significantly reduces the construction of the concrete layer. It can be done easily. In addition, a protective material with chemical resistance, heat resistance, and heat insulation properties is placed on the contact surface between the elastic material and the filler, so that regardless of the type of filler, the elastic material may be adversely affected by heat or chemicals. This not only prevents the elastic material from shrinking after construction, but also allows the surface of the concrete layer to be finished flat after construction. Furthermore, since the elastic function of the elastic material is not impaired, even if the concrete layer expands and contracts due to seasonal changes or changes in atmospheric temperature, the elastic material's elasticity will be able to absorb the expansion and contraction, and it will not be damaged and will last for a long time. Durable and durable.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; Fig. 1 is a perspective view during construction, Fig. 2 is a partial perspective view of joint cutting material, Fig. 3 is an exploded perspective view of Fig. 2, and Fig. 4 Figures 5a to 5c are exploded perspective views showing other embodiments of the partition material.
is an explanatory diagram of the construction process. 4...Elastic material, 5...Intermediate material, 6...Surface material,
7... Protective material, 8... Partition material, 9... Upper frame material,
15... Concrete layer, 16... Space part, 17
……filler.

Claims (1)

[Scope of Claims] 1. A protective material having at least chemical resistance and heat resistance on the surface and having heat insulation properties is provided on the upper surface of the elastic material to form a long partition material, and the upper end of the partition material is The upper frame material is attached, the partition members covered with the upper frame material are installed at appropriate intervals on the upper surface of the installation part, and concrete is poured into the interior divided by each partition material to form a concrete layer, and then The upper frame material is removed from the partition material to form a space surrounded by the left and right concrete layers and the protective material surface of the partition material, and a waterproof filler is injected into the space. A method of constructing a concrete layer characterized by occlusion. 2. Claim 1, characterized in that the protective material is composed of a surface material having chemical resistance and heat resistance, and an intermediate material having heat insulating properties located between the surface material and the elastic material. Construction method of concrete layer described in section.