JPS6324760Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a cap for joint cutting material for concrete that is used to prevent cracks in pressed concrete that occur due to expansion and contraction due to changes in temperature of concrete structures such as buildings and road surfaces. The purpose is to improve the bondability to the poured concrete and the ability to follow expansion and contraction without reducing the gripping force on the joint material during construction, and to improve the ability to follow expansion and contraction over time. The purpose is to prevent rainwater from entering due to changes.

As this kind of joint cutting material for concrete, a joint material made of a long foam board or the like, with a cap made of a long frame body made of a hard synthetic resin having an approximately Π cross section fitted onto the top of the joint material, is generally used. This is installed on the tarpaulin sheet surface on the slab concrete, which is the surface where concrete is to be poured, and the degree of fit of the cap to the joint material is adjusted to correspond to the thickness of the concrete to be poured due to the formation of a flow gradient. The reference surface height of the concrete joint material is adjusted and the above-mentioned retaining concrete is poured, but due to the structure, the cap moves laterally near the opening at the bottom, but is fixed by a horizontal plate at the top. Because of this, it cannot follow the expansion and contraction of the holding concrete, and as a result, a gap is created between the holding concrete and the cap, resulting in problems such as rain leakage.

Therefore, it has been devised that all or part of the top wall plate of the cap is made of soft material so that the above-mentioned stress can be absorbed by the soft material. has decreased dramatically,
It could not be said that the functionality was satisfactory, as the height of the reference surface could not be adjusted.

This invention was devised in view of the above, and
The embodiments of the present invention shown in the drawings will be described below. Fig. 1 is a sectional view showing one embodiment of the cap of the joint cutting material for concrete of the invention, and Figs. 2 and 3 show other embodiments. The cross-sectional view, FIGS. 4 and 5 are a cross-sectional view and a partially cutaway perspective view of the same as the above, showing the state of use. A long frame body A having a substantially Π-shaped cross section by hanging vertical walls 3, 3 made of hard synthetic resin from both sides of a plate 2.
Near the upper end between the vertical walls 3, 3, a plate made of hard synthetic resin is curved or bent so as to have elasticity in the lateral direction so as to have a semicircular, U-shaped, V-shaped, etc. cross section. This is a cap for joint cutting material for concrete made by spanning spring plates 4.

The caps of these joint cutting materials for concrete are integrally molded by composite extrusion molding made of hard synthetic resin and soft synthetic resin, and the outer surfaces of the vertical walls 3, 3 are made of pressing concrete. A locking piece 5 is appropriately formed in order to improve the bonding properties.

Since the cap of the joint cutting material for concrete according to the present invention has the above-mentioned structure, when using it, as shown in Figs. Joint material B consisting of a board is fitted and laid at predetermined intervals on waterproof sheet b stretched over slab concrete a, and then the degree of fitting of joint material B is adjusted according to the flow gradient of rainwater, etc. Adjust the presser concrete c
It is poured and hardened.

As is clear from the above, since the cap of the concrete joint cutting material of the present invention is formed by spanning the spring plate 4 near the upper end between the vertical walls 3, 3, the joint material B
are firmly fitted, which makes it possible to adjust the height of the reference surface in accordance with the flow gradient of the holding concrete during construction, and together with the spring plate 4, a part of the horizontal plate 2 has elasticity. Synthetic resin 1
Since the holding concrete C expands and contracts due to changes in temperature, the vertical walls 3, 3 move in conjunction with this, and from this, the joint material B
Since no gap is formed at the joint surface between the concrete and the holding concrete c, the intrusion of rainwater is prevented, and even if the side surface is heated by solar heat etc. after construction, the spring plate 4 is formed inside the elongated frame body A. Because it is made of aluminum, it is less affected by heat, and it also helps prevent structural elongation, which further improves its function as a joint cutting material.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing one embodiment of the cap of the concrete joint cutting material of the present invention, Figures 2 and 3 are
The figures are cross-sectional views showing other embodiments, Figures 4 and 5.
The figure is a sectional view of the same as the above showing the state of use. A... Long frame body, 1... Synthetic resin having elasticity, 2... Horizontal plate, 3... Vertical wall, 4... Spring plate.

Claims (1)

[Scope of utility model registration request] A cap for a concrete joint cutting material is formed by hanging vertical walls made of hard synthetic resin from both sides of a horizontal plate, at least a portion of which is made of elastic synthetic resin such as soft polyvinyl chloride, to form a long plate having an approximately Π-shaped cross section, and by hanging a spring plate made of hard synthetic resin that has been bent or folded so as to have elasticity in the lateral direction and have a semicircular, U-shaped, V-shaped, etc. cross section, between the upper end portions of the vertical walls.