JPH0122827Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a concrete exterior wall constructed using exterior wall truss plates (precast reinforced concrete exterior wall semi-finished products).

Recently, exterior walls of buildings such as high-rise residences and buildings have been constructed using exterior wall truss plates.

FIGS. 1A, B, and C show examples of conventional truss plates 1 for exterior walls. This exterior wall truss plate 1
, a plurality of truss bars 3 are arranged vertically in parallel on the back side of a precast concrete plate 2, the bases of these truss bars 3 are buried in the precast concrete plate 2, and the tips of these truss bars 3 are It has a structure that protrudes from the back side of the precast concrete plate 2. The truss muscle 3 is a lattice muscle 3 in which one top muscle 3a and two bottom muscles 3b, 3b arranged in a triangular manner form a wave shape, as shown in FIG.
The structure is welded and connected at c. Reinforcing bars 4 are embedded above and below these truss bars 3 in a direction perpendicular to them.

Next, the structure of a concrete outer wall using such a truss plate 1 will be explained together with its manufacturing process.
The truss plate 1 has truss bars 3 as shown in FIG. 3A.
The truss plate 1 is erected between the upper and lower girders 5, 5 with the protruding side inward, and the truss bars 3 are welded to these girders 5, 5, etc. to fix the truss plate 1. An inner formwork 6 is erected and fixed inside the truss plate 1, and then concrete 7 is poured on-site between the truss plate 1 and the inner formwork 6, as shown in Figs. 3B and 4. A concrete outer wall was constructed as shown in the figure. Of course, the formwork 6 is removed after the concrete 7 has hardened.

However, in such a concrete exterior wall, the conventional truss plates 1 have truss reinforcements 3 only in the vertical direction, so each truss plate 1 located on the outer surface of the concrete exterior wall tends to warp in the width direction. It was hot.

In particular, when a finishing material such as a tile is applied first, the difference in shrinkage between the inside and outside becomes large and warping is likely to occur.

Furthermore, when wall concrete is cast using the truss plate 1 as the outer wall surface, the stress due to the lateral pressure of the cast-in-place concrete is concentrated along the truss bars 3,
This was also a cause of vertical cracks.

The purpose of this invention is to prevent warping of truss plates for exterior walls, while also dispersing stress during wall concrete placement in the width direction, preventing cracks, and further improving overall strength with cast-in-place concrete. It is possible to provide concrete exterior walls.

The present invention is a vertical truss plate for an exterior wall, in which a truss bar is provided on the back side of a precast concrete plate with its base part buried in the precast concrete plate and its tip part protruding from the back side of the precast concrete plate. In a concrete external wall that is installed on the back side of the precast concrete plate and is integrally constructed with concrete cast on-site, the external wall truss plate has the truss bars arranged in a lattice pattern on the back side of the precast concrete plate. At the same time, reinforcing bars are provided at predetermined locations at the tips and bases of the longitudinal truss bars in a direction perpendicular to the longitudinal truss bars, and the truss plate is arranged at the tips of the truss bars in a lattice shape. The reinforcing bars on the tip end side are embedded and integrated in the cast-in-place concrete.

Embodiments of the present invention will be described in detail below with reference to the drawings. FIGS. 5A, B, and C show an example of the outer wall truss plate 1 used in the present invention. This exterior wall truss plate 1 has truss bars 3 arranged in a grid pattern vertically and horizontally on the entire back surface of a precast concrete plate 2, the base of which is buried in the precast concrete plate 2, and the tip of The part has a structure that projects from the back surface of the precast concrete plate 2. Reinforcing bars 4 are arranged above and below these truss bars 3.

Next, the structure of a concrete outer wall using such a truss plate 1 will be explained together with its manufacturing process. As shown in FIG. 6A, the truss plate 1 is vertically installed between the upper and lower girders 5, 5 with the protruding side of the truss bars 3 inward, and the truss bars 3 are attached to these girders 5, 5, etc.
Weld and fix. An inner formwork 6 is erected and fixed inside the truss plate 1, and then concrete 7 is poured on-site between the truss plate 1 and the inner formwork 6, and each truss reinforcement 3 forming a grid is formed. By embedding the tip end portion and each reinforcing bar 4 on the tip side side in this cast-in-place concrete 7, the two are integrated to obtain a concrete outer wall as shown in FIGS. 6B and 7. The inner formwork 6 is removed after the cast-in-place concrete 7 has hardened. In addition, 8 is a tile previously attached to the surface of the precast concrete board 2, and 9 is a caulking which seals between the truss boards 1.

As described above, in the concrete exterior wall according to the present invention, truss bars are projected from the back side of the exterior wall truss plate in a vertical and horizontal lattice pattern, and the tips of the truss bars forming the lattice shape and each reinforcement on the tip side. Since the reinforcing bars are embedded and integrated into the cast-in-place concrete, the connection between the truss plate and the cast-in-place concrete is strong, and the truss plate can be prevented from warping both in the vertical and horizontal directions. In addition, in the past, it was difficult to connect adjacent truss plates in the horizontal direction, but in the present invention, truss bars are also included in the horizontal direction, so by interconnecting these horizontal truss bars, it is difficult to connect adjacent truss plates in the horizontal direction. It is possible to easily integrate the truss plates in both directions.

Furthermore, the stress due to lateral pressure during wall concrete placement is dispersed in the width direction by the truss bars and reinforcing bars, eliminating the occurrence of cracks on the outer surface.

[Brief explanation of the drawing]

Figure 1A is a back view of a conventional truss plate, Figure 1B
and C are longitudinal and cross-sectional views of the truss plate shown in Figure 1A, Figure 2 is a perspective view showing an example of truss reinforcement, and Figures 3A and B are longitudinal sections showing the process of forming a conventional concrete outer wall. 4 is a partially enlarged vertical sectional view of a conventional concrete outer wall, FIG. 5A is a back view showing an example of a truss plate used in the present invention, and FIG. 5B is a top view.
and C are a vertical cross-sectional view and a cross-sectional view of the truss plate shown in FIG. 5A, FIGS.
The figure is a partially enlarged vertical sectional view showing an example of a concrete outer wall according to the present invention. 1... Exterior wall truss plate, 2... Precast concrete plate, 3... Truss bar, 4... Reinforcement bar,
5... Girder, 6... Inner formwork, 7... Cast-in-place concrete.

Claims (1)

[Scope of utility model registration request] An exterior wall truss plate is installed vertically on the back side of a precast concrete plate, and the truss bar is provided with the base part buried in the precast concrete plate and the tip part protruding from the back side of the precast concrete plate, In a concrete exterior wall that is integrally constructed with concrete cast on-site on the back surface, the exterior wall truss plate has the truss bars arranged in a grid pattern on the back surface of the precast concrete plate, and Reinforcing bars are provided at predetermined locations at the tips and bases of the longitudinal truss bars in a direction perpendicular to the longitudinal truss bars, and the truss plates are arranged at the tips and bases of the truss bars in a lattice shape. A concrete outer wall characterized in that the side reinforcing bars are embedded and integrated in the cast-in-place concrete.