JPH0240672Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Technology) This invention relates to a joint material that is used to prevent cracking in concrete and is suitable for use when forming a mortar layer on a concrete pouring surface.

(Prior Art) Conventionally, various joint materials have been used to prevent the occurrence of cracks in concrete, and in particular, so-called joint materials that are made of foamed resin and covered with a plastic cap on the top of the joint material body have been used. , so-called expansion joint materials are becoming popular.

In the case of such an expandable joint material, as the cap portion bends during joint construction, the joint material body made of foamed plastic or the like becomes curved, making it difficult to construct the specified joint. In addition, when a mortar layer is provided on the concrete placement surface, the level of the concrete placement surface or mortar layer surface cannot be adjusted to a uniform level due to the joint material.
This work requires extremely skill.

(Purpose of the invention) This invention was created in view of the above, and its purpose is to prevent curvature during joint construction and to ensure the formation of a mortar layer on the concrete pouring surface during concrete pouring. To provide a joint material that can be easily and easily applied.

In order to achieve the above-mentioned object, this invention has the following features: An elastic body is arranged between a pair of legs having a substantially L-shaped cross section, and a groove is formed on the upper surface of each leg along its longitudinal direction. A joint material body and a cap that is removably fitted into the groove of the joint material body and whose level is adjusted to the concrete placement surface or the mortar layer surface on the concrete placement surface, and has a cap at both ends in the width direction. The cap is characterized in that a rubber surface member is removably provided between the disposed metal members, and an adhesive layer is provided on at least a portion of both sides of the cap.

(Structure of the invention) FIG. 1 is a sectional view of a joint material showing an embodiment of this invention, and shows an example in which a first cap is provided.

In FIG. 1, the main body of the joint material consists of a pair of legs 1 made of plastic and having a substantially L-shaped cross section, and an elastic body 2 made of urethane foam or the like placed between them.
It is made up of. The leg body 1 and the elastic body 2 may simply be sandwiched in a sandwich shape.
It may be fixed using an adhesive or adhesive or other means. Although not shown, the leg 1
A reinforcing metal member may be placed inside or outside.

Furthermore, a groove 4 is formed on the upper surface of the leg body 1 along its longitudinal direction.

In Figure 1, 3 indicates the first cap;
The cap 3 is made of plastic, and an engaging portion having a cross-sectional shape corresponding to the cross-sectional shape of the groove 4 formed in the leg body 1 is formed at the lower end of both legs. 1 can be easily attached and detached from the longitudinal direction.

FIG. 2 is a sectional view showing an embodiment of the second cap in this invention.

In FIG. 2, the second cap 5 is mainly composed of a cap body 7, a surface member 8, and a plate member 6. As shown in FIG. A cap 12 made of brass, steel, or aluminum is attached to cover the top surface and upper side surface of the cap body 7, and an adhesive layer 13 of butyl rubber or the like is provided on the outer surface of the cap body 7 below the cap 12. It is being
Further, a parallel plate 7A is provided that projects inwardly of the cap body 7 and extends in the longitudinal direction of the cap body 7.
is formed. The plate member 6 is inserted into the groove formed by the parallel plate 7A, and the parallel plate 7A is held in a downwardly curved state.

Further, a surface member 8 made of synthetic rubber or the like is fitted onto the upper part of the parallel plate 7A while being engaged with the engaging portion 12A of the cap 12, and is detachable along the longitudinal direction of the joint material. .

Next, according to FIG. 3, joint construction using the joint material of this invention will be explained.

First, as shown in FIG. 3A, a joint material is placed on the base 9 using adhesive or mortar, and concrete 10 is poured, as in the case of ordinary joint construction. At this time, the engaging portion of the leg of the first cap 3 is fitted into the groove 4 formed on the upper surface of the leg 1 from the longitudinal direction of the leg 1.

In the case of such concrete placement,
The leg 1 has a substantially L-shaped cross section, and even if the first cap 3 tries to curve, the structure of the leg 1 can prevent the joint material itself from curving.

Next, concrete is poured, and after the concrete has cured, the first cap 3 is removed from the leg 1, and the engaging part 7b of the second cap 5 is fitted into the groove of the leg 1, as shown in FIG. 3B. Install it in the same position.

After that, when mortar finishing is performed, the mortar layer 11 can have a thickness corresponding to the height of the second cap 5 that projects above the concrete placement surface. Therefore, mortar finishing can be carried out extremely easily without requiring a high level of skill.

In addition, when concrete placement is completed in the state shown in Figure 3A, as in the past, and a mortar layer is provided on the concrete pouring surface after curing the concrete, this surface Cracks occur in the surface mortar layer because a joint material that can follow the expansion and contraction of the mortar layer is not placed, but in the above-mentioned embodiments, it is possible to prevent such cracks in the surface mortar layer. Can be done.

Furthermore, if the surface member 8 is damaged after a period of time has passed after forming the mortar layer, the surface member 8 can be removed along the longitudinal direction of the joint material and a new surface member 8 can be installed. can be maintained in an undamaged condition. Furthermore, the second cap 5 itself can be replaced.

In the case of the second cap 5 in this embodiment, the surface of the joint material is made of rubber or the like and metal surfaces are formed on both sides thereof, which is suitable for aesthetics.

In addition, since the cap 12 is made of metal, it is effective in preventing the joint material from curving, and the surface member 8 made of synthetic rubber or the like can freely absorb the expansion and contraction of the concrete, especially when the concrete expands.
Since the parallel plate 6 is curved downward, the surface member 8 is not pushed upward, and the joint material can be maintained at the level of the mortared surface. Moreover,
Although the cap 12 is made of metal, an adhesive layer 13 made of butyl rubber or the like is provided on the side surface thereof, so that separation of the concrete surface can be prevented.

Also in this embodiment, if the second cap 5 is damaged, the entire second cap 5 may be replaced.
Furthermore, only the surface member 8 of the second cap 5 may be replaced.

In addition, since both the leg body 1 and the second cap 5 have the same shape on the left and right, there is no need for separate extrusion molds, and it is sufficient to simply cut out the same mold and make them face each other, which reduces mold manufacturing costs. Not only this, but also production efficiency, inventory management, etc. are extremely beneficial.

In this invention, if mortar finishing is not performed, the joint material is placed with the second cap shown in FIG. 2 still fitted into the groove 4 of the leg 1. Therefore, the joint material of this invention is exposed on the surface of the final joint.

(Operation and Effect of the Invention) As described above, according to the joint material of this invention, an elastic body is arranged between a pair of legs having a substantially L-shaped cross section, and the elastic body is disposed on the upper surface of each of the legs along the longitudinal direction. Since the joint material main body is provided with ivy grooves, the joint material is prevented from curving.

In addition, it is removably fitted into the groove of the joint material body,
Since a cap is provided on the concrete pouring surface or the mortar layer on the concrete pouring surface so that the level can be adjusted, applying mortar after concrete pouring becomes an extremely simple operation, and if the joint material is damaged, a second Since the cap can be replaced and only the surface member of the second cap can be replaced, it is possible to maintain the joint construction surface in a predetermined state at all times.

In addition, the joint material surface is made of a rubber color and a metal color, which gives the joint material a high-class image, and an adhesive layer is provided on at least a portion of both sides of the cap. , it is possible to prevent concrete from splitting.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of this invention, FIG. 2 is a sectional view showing a second cap in this invention, and FIG. 3 is a sectional view illustrating joint construction using the joint material of this invention. In the figure, 1 is a leg body, 2 is an elastic body, 3 is a first cap, 4 is a groove, 5 is a second cap, 6 is a plate member, 7 is a cap body, 7A is a parallel plate, and 8 is a surface member. , 9 is the foundation, 10 is the finished concrete,
11 designates a mortar layer, 12 a cap, and 13 an adhesive layer.

Claims (1)

[Scope of utility model registration request] An elastic body is disposed between a pair of legs having a substantially L-shaped cross section, and a joint main body is formed with a groove along the longitudinal direction on the upper surface of each of the legs, and the elastic body is detachable from the groove of the joint main body. A cap that is freely fitted and whose level is adjusted to the concrete pouring surface or the mortar layer surface on the concrete pouring surface, and a rubber cap that can be detachably attached between the metal members arranged at both ends in the width direction. 1. A joint material comprising: a cap provided with a surface member made of aluminum and having an adhesive layer formed on at least part of both sides of the cap.