JPS60219305A - Construction of concrete layer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention is a method of constructing concrete layers using joint cutting materials that are buried on the roofs of buildings, on roads, and other concrete layers to prevent cracks from occurring due to temperature changes due to seasonal changes. It is about the 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 changes in temperature due to seasonal changes, countless cracks occur on the concrete surface due to expansion and contraction, so to prevent the occurrence of cracks, it is necessary to bury the joint material in the form of squares at appropriate intervals. It won't happen.

Therefore, as a joint cutting material, the height is the same as the thickness of the concrete layer, it reliably separates the left and right concrete layers separated by the joint cutting material, and the boundary between the joint cutting material and the concrete layer is in close contact. It must not cause cracks 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 Publication No. 55-55952 and Japanese Utility Model Publication No. 54-1124, the present applicant proposed a concrete joint cutting material in which an upper frame and a lower frame are attached to the top and bottom of 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 leakage 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, leading to rain leakage and damage.

The present invention has been 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, when the filler directly contacts the elastic material, the force < ,
There is no risk of the elastic material losing its function.

To explain the embodiment in the drawings below, / is slab concrete that is the basis of the concrete layer, a waterproof layer is formed on the top surface of the concrete layer, and joints are cut in the form of squares at appropriate intervals on the top surface of the waterproof layer. Install material 3.

As shown in Figs. 2 and 6, the joint cutting material 3 is an intermediate material having heat insulating properties on the top surface of the vertically long elastic material. A thick protective material 7 consisting of a surface material 6 having chemical resistance and heat resistance is provided to form a long external partition material, and a long upper frame material extending in the height direction is provided at the upper end of the partition material t. It is coated with resin.

Elastic material 1Ilfl 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 S made of a heat insulating soft rubber or the like is adhered to the upper surface of the elastic material along its length. Further, on the upper surface of the intermediate material 5, a surface material 6 made of a thick tape or a thin plate made of chemical-resistant and heat-resistant vinyl chloride or polyester is adhered. □ In the embodiment shown in FIG. 2 or 6, a double-sided adhesive tape /θ is adhered to the upper surface of the elastic material, and the intermediate material S and the surface material 6 are adhered to the upper surface of the tape 10 to form the elastic material. The material and the protective material 7 are integrally bonded.

FIG. 4 shows another embodiment of the partition material, in which a protective material 7' is formed by forming a material that has chemical resistance, heat resistance, and heat insulation properties into a thick plate, and the protective material 7' is made of an elastic material. A long partition material g is formed by adhering the partition material g directly or integrally to the upper surface of the material d' through an adhesive tape 10'. According to this embodiment, the protective material 7
' can be formed into a single layer, making the production of the partition material extremely simple.

The above-mentioned upper frame member is a long member with a vertically elongated downward U-shaped cross section, and support pieces /2. 1 is provided to protrude along the longitudinal direction, and a hollow part /3 extending in the longitudinal direction is formed inside. The upper frame member t is integrally molded from elastic soft or semi-hard synthetic resin, and the upper end of the partition member is connected to the leg portion of the upper frame member.

/l Attach with adhesive at the bottom end.

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 is applied to the top surface of the slab concrete as shown in FIG. The joint cutting materials 3 are placed on the waterproof layer 2 in a grid pattern at appropriate intervals, and mortar is cast and hardened to cover the sides of the partition materials.

When the mortar /4' hardens, the joint cutting material 3 is fixed, so concrete is poured into the interior sectioned by the joint cutting material 3 to form a concrete layer 15 (Fig. 5 (α)
)).

Incidentally, it is advisable to apply a release agent to the outer surface of the upper frame material 9 before pouring the concrete.

After the concrete has hardened, the upper frame member 9 of the joint cutting material 3 is removed (FIG. 5(b)). When the upper frame member 9 is removed, a long groove-shaped space /6 is formed along the length of the upper surface of the partition member surrounded by the left and right concrete layers /3 and the surface of the protective material 7 of the partition member.
is formed. A waterproof filler 17 is placed in the space/B.
is injected and cured (Fig. 5(C)). As the filler hardens, a long filler layer is formed in the space 6.

As the filler, molten asphalt or a solution of urethane resin caulking agent is used. The melted asphalt is at a high temperature, but since the protective material 7 is provided on the contact surface with the asphalt, the elastic material S is not directly heated to high temperatures due to the heat insulating effect of the protective material. It melts due to heat and does not shrink.

Also, even when using a solution caulking agent,
Since the protective material 7 is provided on the contact surface, the ingredients of the caulking agent will not penetrate directly to the elastic material S.
The elastic material 5 will not react to chemicals and melt and shrink.

Therefore, since the filler surface is not depressed, the thickness of the filler layer and the concrete layer IS can be made uniform, and the surface of the concrete layer /S can be finished flat after construction. Moreover, since the filler layer can be placed in close contact with the left and right concrete layers/1, rainwater will not infiltrate inside, and since the bottom surface of the elastic material is in contact with slab concrete, etc., each Concrete layer! can be reliably severed.

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 material after concrete is poured, so the construction of the concrete layer is significantly simplified. 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. It is possible to prevent shrinkage of the elastic material after construction, and it is possible to finish the surface of the concrete layer evenly 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. Can withstand use over a period of time.

[Brief explanation of drawings]

The drawings show examples of the present invention, and Fig. 1 is a perspective view during construction, Fig. 2 is a partial perspective view of joint cutting materials, and Fig. 5
4 is an exploded perspective view showing another example of the partition material, and FIG. 5 is an explanatory view of the construction process. ...Intermediate material, 6...Surface material, 7
...Protective material, 5...Partition material, Ri...Top frame material, l
S...Concrete layer, 16...Space part, /7...
·filler.

Claims (2)

[Claims] (1) A protective material having at least chemical resistance and heat resistance on the surface and heat insulation properties is provided on the top surface of the elastic material to form a long partition material, and an upper frame material is attached to the top end of the partition material. The partition materials 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 partitioned by each partition material to form a concrete layer. The upper frame material was removed to form a space surrounded by the left and right concrete layers and the surface of the protective material of the partition material, and a waterproof filler was injected into the space to close the space with the filler. A concrete layer construction method characterized by: (2) a surface material whose protective material has chemical resistance and heat resistance;
Claim 1, characterized in that it consists of an intermediate material having heat insulating properties located between the surface material and the elastic material.
Construction method of concrete layer described in section.