JPH0510103Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to the improvement of joint materials buried on the roofs of buildings, road surfaces, and other concrete layers.

<Prior Art> Conventionally, as shown in FIG. 3, this type of joint material consists of a joint body 1 made of an elastic material, a cap 2 attached to the upper end of the joint body 1, and a joint body 1 made of an elastic material. A concrete joint material 4 comprising support legs 3, 3 extending diagonally downward from both left and right sides of the joint material 1 is well known.

<Problems to be solved by the invention> However, with the conventional joint material 4, as shown in FIG. When erected, a slight gap 6 may be created between the foundation surface 5 and the bottom surface of the joint body 1.

In this way, if the joint body 1 is raised even in one place, when the concrete layer 7 is poured, concrete will seep into the gap 6 between the bottom surface of the joint body 1 and the foundation surface 5, and the joint material 4 The concrete layers 7 on both sides of the gap 6 are continuous with each other at the gap 6.

Therefore, when the concrete layer 7 expands and contracts due to temperature changes, there is a problem in that cracks are more likely to occur in the continuous portions of the concrete layer 7.

<Means for Solving the Problems> Therefore, the present invention solves the above-mentioned problems, and the details thereof will be explained below using the embodiments shown in FIGS. 1 and 2.

In the present invention, the joint body 11 is attached to the lower end of the joint body 11.
The joint body 11 is characterized in that cushion members 14 extending below the bottom surface of the joint body 11 are arranged in parallel along the longitudinal direction of the joint body 11.

<Function> Therefore, according to the present invention, the cushioning material 14 extending below the bottom surface of the joint body 11 is arranged in parallel along the longitudinal direction of the joint body 11 at the location where the joint body 11 is floating. , the bottom surface of the cushion material 14 is in close contact with the base surface (for example, the top surface of the waterproof sheet 24).

Therefore, the continuity of the concrete layers 25 on both sides of the joint material 10 is interrupted by the joint body 11 and the cushion material 14 (FIG. 2).

<Example> The present invention will be described below based on an example shown in the drawings.

In the figure, 10 indicates a joint material, and this joint material 10
As shown in FIG. 1, the joint body 11 is made of an elastic material, the cap 12 is attached to the upper end of the joint body 11, and a pair of support legs extend diagonally downward from both sides of the joint body 11. 13, 13, and a cushion material 14 extending below the bottom surface of the joint body 11 is provided at the lower end of the joint body 11.
1 are arranged in parallel along the longitudinal direction.

The joint main body 11 is formed into a long length using an elastic material such as foamed polyethylene.

The cap 12 includes an attached portion 15 having a substantially downward U-shaped cross section, and a pair of collar portions 16, 16 extending outward from both lower ends of the attached portion 15 to the left and right. The attached portion 15 and the flange portion 16 are made of, for example, hard vinyl chloride and are extruded into a long length.
Further, a tape 17 is attached to the upper surface of the adhered portion 15, and this tape 17 is peeled off after the concrete is placed to prevent concrete from adhering to the upper surface of the adhered portion 15. A soft layer (not shown) made of soft vinyl chloride, rubber, etc. is formed on the outer surface of the adhered portion 15 to improve the adhesion and watertightness between this soft layer and the concrete in contact with it. .

The support legs 13 are connected to each other at their upper ends, and a fitting part 18 having a substantially downward U-shaped cross section into which the upper end of the joint main body 11 is fitted is provided at the upper end of the connection. The support legs 13 are integrally formed by bending a metal plate. In addition, check claws 19, 1 are formed by punching outward on both sides of the fitting part 18.
9 is provided, and the fitting part 18 is attached to the fitting part 1 of the cap 12.
When the cap 12 is inserted into the cap 5, the check pawl 19 engages with the inner surface of the attached portion 15, thereby preventing the cap 12 from coming off.

The cushion material 14, like the joint main body 11, is made of, for example, foamed polyethylene and is formed into a long length. This cushion 14 may be fixed directly to the lower end side surface of the joint main body 11 at different levels with an adhesive or the like, but in the embodiment shown in FIGS. 1 and 2, a special holder 20 is used. Installing.

The holder 20 has a joint fitting part 21 having a substantially upward U-shaped cross section into which the lower end of the joint main body 11 is fitted, and an upper end part of a cushion material 14 having one side in common with the joint fitting part 21. Similarly, the mounting portion 22 has a substantially downward U-shaped cross section, and is integrally molded from hard vinyl chloride, for example, like the cap 12. Furthermore, outwardly extending projecting portions 21' and 22' are provided at both left and right outer free ends of the joint fitting portion 21 and mounting portion 22, respectively. still,
Similar to the cap 12, a soft layer (not shown) made of soft vinyl chloride or rubber is formed on the outer surfaces of the joint insertion part 21 and the mounting part 22 that are in contact with the concrete, and the adhesion between this soft layer and the contacting concrete is formed. It is recommended to improve the watertightness and watertightness.

Next, to explain the construction procedure, first, concrete slab 23 is poured, and waterproof sheet 2 is placed on top of it.
Lay 4. Next, the joint material 10 is arranged in a square pattern on the upper surface of the waterproof sheet 24.

The joint material 10 has been assembled before that,
To assemble the joint material 10, cut the joint main body 11 to the usable length, fit the fitting portions 18 of the support legs 13 into the upper end thereof at appropriate intervals from above, and then cut the joint main body 11 into the same length as the joint main body 11. It is sufficient to attach the attachment portion 15 of the cap 12 cut to length.

The thus assembled joint material 10 is first set in a predetermined position with both supporting legs 13 in contact with the upper surface of the waterproof sheet 24.

At this time, the bottom surface of the joint main body 11 is
Check to see if there is any levitation from the top of 4. That is,
When pouring slab concrete 23, it is constructed so that the construction surface is flat, but in reality, some unevenness or difference in height will occur on the construction surface, so the joint material 10 is placed on the support leg 13. When you stand it up,
If the point where the support leg 13 touches the ground is high, the joint body 1
This is because the bottom surface of 1 may be slightly raised.

At that time, the joint fitting portions 21 of the holder 20 are inserted from below into the lower end of the joint main body 11 at appropriate intervals,
The upper end portion of the cushion material 14 cut to the same length as the joint main body 11 is fitted into the other mounting portion 22 from below.

When the cushion material 14 is installed in this manner, the lower end of the joint body 11 and the upper end of the cushion material 14 are held between the joint body 11 and the upper end of the cushion material 14 by the elastic restoring force of the joint insertion part 21 and the mounting part 22, and the cushion material 14 is inserted into the joint via the holder 20. Since the cushion material 14 is held at the lower end of the main body 11 and the vertical height of the cushion material 14 is higher than the depth of the mounting portion 22 of the holder 20,
The lower end of the cushion material 14 protrudes below the bottom surface of the joint body 11.

Then, after attaching the cushion material 14 and standing it up again on the support legs 13 in its original position, as before,
Although the bottom surface of the joint main body 11 does not touch the top surface of the waterproof sheet 24, since the lower end of the cushion material 14 protrudes below the bottom surface of the joint main body 11, the bottom surface of the cushion material 14 elastically contacts the top surface of the waterproof sheet 24. Close contact with target.

Cushion materials 14 are attached to the locations where the bottom surface of the joint body 11 is raised as described above, and concrete is poured into the squares partitioned by the joint material 10 to form a concrete layer 25. (Figure 2).

As shown in FIG. 2, the concrete layer 25 formed in this way has continuity with the joint material 10 as the bottom surface of the cushion material 14 is in close contact with the top surface of the waterproof sheet 24. be cut off.

Therefore, even if the concrete layer 25 expands or contracts due to temperature changes, the joint body 11 and cushion material 14
By expanding and contracting following this, it absorbs the expansion and contraction of the concrete layer 25 and prevents cracks from occurring in the concrete layer 25.

In addition, since the cap 12 is provided with a pair of flanges 16 extending outward from the left and right, the flanges 16 dig into the hardened concrete layer 25, thereby causing
Upper cap 12 and concrete layer 2
5 can be prevented from moving up and down. Furthermore,
Like the cap 12, the holder 20 is also provided with overhanging parts 21' and 22' extending outwardly to the left and right, so that both the overhanging parts 21' and 22' are inserted into the hardened concrete layer 25. By digging in, vertical movement of the holder 20 within the concrete layer 25 can be prevented.

On the other hand, the cushion material 14 may be prepared and placed in advance with its height and width standardized, or the material of the cushion material 14 may be the same as that of the joint body 11.
may be used as the cushion material 14.

At that time, the joint body 11 is cut from the middle of the height in accordance with the gap 26 between the bottom surface of the joint body 11 and the top surface of the waterproof sheet 24, and the cut joint body 11 is attached to the holder 20. It is inserted into the section 22 and used as the cushion material 14.

In addition, as an effect of using the holder 20, the height of the cushion material 14 is insufficient, and the cushion material 1
Even if the bottom surface of the waterproof sheet 24 does not reach the top surface of the waterproof sheet 24, the cushion material 14 is attached to the attachment part 2 of the holder 20.
2, or by shallowly fitting the lower end of the joint body 11 into the joint fitting part 21 of the holder 20, the cushion material 1 can be removed from the bottom of the joint body 11.
The protrusion amount of 4 can be adjusted freely to some extent.

<Effects of the invention> As explained above, according to the invention, even if the joint body rises above the foundation surface, the cushion material extending below the bottom surface of the joint body can be moved in the longitudinal direction of the joint body. By arranging the cushion material side by side, the bottom surface of the cushion material comes into close contact with the foundation surface, and it is possible to provide a joint material that can reliably break the continuity of the concrete layers on both sides of the joint material up to the bottom surface.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is an exploded perspective view, Fig. 2 is a partial sectional view of the construction site, and Fig. 3 is a partial sectional view of the construction site using conventional joint material. It is. In the figure, 10 is the joint material, 11 is the joint body, and 12
13 is a cap, 13 is a support leg, 14 is a cushion material, 23 is a concrete slab, 24 is a waterproof sheet, and 25 is a concrete layer.

Claims (1)

[Claims for Utility Model Registration] For concrete, comprising a joint body made of an elastic material, a cap attached to the upper end of the joint body, and a pair of support legs extending diagonally downward from both sides of the joint body. A joint material for concrete, characterized in that a cushion material extending below the bottom surface of the joint body is arranged in parallel along the longitudinal direction of the joint body at the lower end of the joint body.