JPH0439945Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an expansion joint material used to prevent cracks in concrete, and in particular improves the widthwise elasticity and bending resistance of the cap part. The invention relates to expanded joint fillers.

[Conventional technology]

Expandable joint materials are made of synthetic resin foam with a cap placed on top of the main body of the joint material, and there are two types of joint materials: those with caps made of hard materials and those with caps made of soft materials. . In the case of hard caps, since the caps have little elasticity in the width direction, some designers are concerned about their functionality as a joint material and stick to soft caps. In the case of soft caps, the mechanical strength is weak and cannot withstand the pressure during concrete pouring, so it is necessary to increase the thickness of the joint material body, lower the foaming ratio, make the shape into a trapezoid, for example, and strictly press it with mortar. Efforts have been made to make this possible.

However, considering the ease of work and cost during joint construction, joint materials using caps made of hard materials such as hard vinyl chloride are currently in widespread use.

As mentioned above, caps made of hard materials such as vinyl chloride not only have little elasticity in the width direction, but also can be used, for example, on the roofs of concrete buildings when the joint material is assembled in a square pattern. In this case, the side that is exposed to sunlight tends to expand and curve, and it also contracts in the longitudinal direction, creating voids at the joints.Therefore, improvements are desired.

For example, Japanese Utility Model Application No. 54-109310 is known as a method for improving the non-stretchability of hard caps in the width direction.

However, in the case of this joint material, although it has the function of following the contraction of concrete, there is a risk of rainwater entering the joint material, and since the top surface of the joint material and the concrete pouring surface are the same, the surface of the concrete Rainwater tends to accumulate on top. In cold regions, cracks may occur in concrete due to freezing of rainwater.

[Problem that the invention attempts to solve]

This invention solves the problems of the conventional technology described above, and is an expandable joint material that has elasticity in the width direction of the cap, prevents curving during construction of the joint material, and prevents cracks in concrete due to rainwater penetration, freezing, etc. Our goal is to provide the following.

[Means to solve the problem]

In order to achieve the above-mentioned purpose, this invention is an expansion joint material consisting of a main body of the joint material made of synthetic resin foam and a cap that is placed on top of the main body of the joint material. a coupling member having a groove formed along the direction, a first protrusion protruding inward in the width direction of the groove at both end entrances of the groove, and a first protrusion formed along the groove; and a coupling member provided on the upper surface of the coupling member. a covering member disposed on both sides of the coupling member and the covering member, and a plate-shaped portion that is loosely fitted into a groove of the coupling member, and a widthwise outer portion of the plate-shaped portion at the tip of the plate-shaped portion. a side plate having second protrusions protruding from each side, and a second protrusion formed on the plate-like part of the side plate inside the coupling member.
The first protrusion is in close contact with the plate-shaped portion at both end entrances of the groove, and the upper end surface of the side plate is higher than the upper surface of the covering member.

〔Example〕

Next, embodiments of this invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 denotes a joint material body made of synthetic resin foam, and in addition to the plate shape as shown, there are trapezoidal and other shapes.

Reference numeral 20 denotes a cap, which covers the surfaces of the left and right side plates 21 made of metal such as aluminum and the connecting member 22 formed of a hard synthetic resin material such as hard vinyl chloride that connects the side plates 21 and 21. Covering member 2 made of soft synthetic resin with good weather resistance
It is composed of 3.

It is preferable to provide ribs 24 on the side wall surface of the side plate 21 in order to improve the bond with the concrete and prevent so-called skin separation, and for reinforcement. In the case of the type in which the adhesive is disposed, the side wall surface may have no irregularities or may be a merely rough surface.

The coupling member 22 and the covering member 23 are integrally molded by extrusion molding of synthetic resin or the like.

Next, the coupling structure between the side plates 21, 21 and the coupling member 22 will be explained.

A plate-like portion 21a is provided on the inner wall surface of the side plate 21 along its longitudinal direction.
A protrusion 25 (second protrusion) that protrudes outward in the width direction of the plate-shaped portion 21a is provided at the tip of the plate-shaped portion 21a.

A groove 26 is formed along the longitudinal direction on both side surfaces of the coupling member 22, and the entrance portions of both ends of the groove 26 protrude inward in the width direction of the groove 26.
A protrusion 26a (first protrusion) formed along
has. Therefore, if the tip of the protrusion 25 of the side plate 21 is pressed against the entrance of the groove 26 of the coupling member 22 and press-fitted, the tip of the protrusion 25 will climb over the entrance step (protrusion 26a) of the groove 26. Inserted.

In such a fitted state, the plate-shaped portion 21a
The protrusion 25 formed at the tip of the groove 26 is in close contact with the inner wall surface of the groove 26, and at the same time, the plate-like portion 21a is attached to the protrusion 26a.
closely followed. Therefore, since the connecting member 22 and the side plates 21, 21 are in complete contact with each other, rainwater and the like will not enter into the joint material.

Further, the protrusion 2 with respect to the groove 26 of the coupling member 22
There is a slight amount of play in the insertion depth of No. 5, and due to the presence of this play, the joint material as a whole has elasticity in the width direction, expands and contracts with the expansion and contraction of the concrete, and expands and contracts with the concrete. Cracks are prevented from forming.

In addition, in order for the side plates 21, 21 to have shrinkability in the width direction, the projections 25 must fit in the grooves 2 as described above.
The condition is that the connecting member 2 must be movable in the width direction within the connecting member 6 as shown in FIG.
It is necessary to form gaps 27 and 28 between the side surfaces of the side plates 2 and the wall surfaces around the plate-like portions 21a of the side plates 21. However, if a gap 27 is provided in this part, the side plate 21
The contact point between the coupling member 22 and the periphery of the protrusion 25,
Since only the entrance step of the groove 26 exists, there is a risk that the bonding strength will be weakened.
It is preferable to place an adhesive such as butyl rubber on one side to increase the bonding strength and to prevent rainwater from entering from this part.

Even when the adhesive is placed, the movement of the side plate 21 in the cap width direction with respect to the coupling member 22 will be prevented.
No problems arise due to deformation of the adhesive.

Further, as shown in FIG. 3, a soft plate 30 is provided below the coupling member 22, and its side portions are slightly protruded outward from the side surface position of the coupling member 22, so that a gap 27,
28, and the shrinkage of the side plate 21 in the width direction may be absorbed by the deformation of the soft material 30 and the covering member 23 made of soft synthetic resin.

In order to supplement the bonding strength between the side plates 21, 21 and the coupling member 22, it is also preferable to place an adhesive on the contact surfaces of the side plates 21, 21 and the joint material main body 10 when bonding them together.

In this case, when the side plate 21 moves in the width direction of the cap with respect to the joining member 22, this can be handled by contraction and expansion of the joint main body 10 made of foam to which the side plate 21 is fixed.

Further, although not shown in the drawings, a plurality of coupling means formed by the protrusion 25 and the groove 26 may be provided. Furthermore, in the embodiment shown in FIG.
It may be arranged on the first side.

In the embodiment described above, the side plate 21 may be molded from hard synthetic resin, and the coupling member 22 may be molded from metal such as aluminum.

Furthermore, in the illustrated embodiment, the upper part of the side plate 21 is bent to protrude above the surface of the covering member 23, and the side plate 21 is made of metal such as aluminum due to the materials of the side plate 21 and the covering member 23. This was done in consideration of the aesthetic benefits of the difference in texture and hue, as well as to facilitate the use of a plastering trowel when pouring concrete, and to prevent damage to the concrete at the edges of the joint material.

As shown in Fig. 4, when the joint material of this invention is used not as a floor joint material but as a so-called wall joint material, a part of the side plate 21 is fixed to the formwork 29 with nails etc. In the case of pouring, the strength of the connection between the side plate 21 and the connection member 22 may be several degrees weaker than in the case of application to the floor joints described above.

[Effect of idea]

Since the joint material of this invention is constructed as described above, the following effects can be obtained.

A: Since the side plate is movable in the width direction of the cap relative to the connecting member, the cap part has elasticity in the width direction and can follow the shrinkage of the concrete.

B The side plate is connected to the joining member so that it can move freely in the longitudinal direction of the side plate, so even if the joint material is set on a floor such as a rooftop and exposed to sunlight, it will not curve like a conventional expansion joint. There's nothing to do.

C The upper end surface of the side plate is higher than the top surface of the covering member, and the joint material is lower than the concrete placement surface, forming a so-called groove, and rainwater flows through the upper surface of the joint material. Therefore, rainwater does not accumulate on the concrete surface. Therefore, for example, rainwater accumulated in cold regions does not freeze, and cracks in concrete can be prevented.

D Due to the first protrusion at the groove entrance on the joint member side and the second protrusion on the side plate side in the joint material, the joint member and the side plate are in a state of complete contact, and the joint material is in a state of complete contact. Rainwater, etc. will not infiltrate.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of this invention.
Fig. 2 is an enlarged sectional view of the main part of Fig. 1, Fig. 3 is an enlarged sectional view of the main part showing another embodiment of this invention, and Fig. 4 is an enlarged sectional view of the main part showing another construction example of this invention. It is a diagram. In the figure, each symbol indicates the following: 10
... Joint material main body, 20 ... Cap, 21 ... Side plate, 22 ... Connection member, 23 ... Covering member, 24
...Rib, 25...Protrusion, 26...Groove, 27...
...Gap, 28...Gap, 29...Formwork, 30...
Soft material.

Claims (1)

[Scope of claims for utility model registration] (1) A joint material body formed of synthetic resin foam;
In an expansion joint material consisting of a cap covered on the upper part, the cap has grooves formed along the longitudinal direction on both sides thereof, and protrudes inward in the width direction of the groove at the entrances at both ends of the groove, a coupling member having a first protrusion formed along the groove; a covering member provided on the upper surface of the coupling member; a side plate that is provided with a plate-like part that is loosely fitted, and has second protrusions that respectively protrude to the outside in the width direction of the plate-like part at the distal end of the plate-like part; A second protrusion formed on the plate-like part is in close contact with the first protrusion at both end entrances of the groove, and the side plate is closer than the top surface of the covering member. An expansion joint material characterized by a raised upper end surface. (2) The expansion joint material according to claim 1 of the utility model registration claim, characterized in that an adhesive is adhered to the outer surface of the side plate.