JPH0555656B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a precast foundation beam joining device for prefabricating a wall-type precast concrete building foundation beam.

[Conventional technology]

Conventionally, in wall-type precast reinforced concrete buildings as shown in Figure 2, the foundation beam 1
are generally constructed of cast-in-place concrete.

By the way, as shown in Figure 4, these foundation beams 1 serve as the basis for all of the wall panels 2, etc. that will be laminated thereon, so the accuracy, construction period, material labor, etc. required for the foundation work must be met. As a result, there has been a desire to prefabricate and simplify the construction, and precast foundation beams have been applied.

When such precast foundation beams 1 are used, the mutual connection of these corner foundation beams 1 is
As shown in the figure, the parts are joined in three ways: an L-shaped joint in part a, a T-shaped joint in part b, and a cross-shaped joint in part c. At each of these joints, a large number of concave portions are preset along the adjacent end faces of each foundation beam 1, as shown in Fig. 5a, b, and c. Concrete 5 was poured to connect them to each other.

[Problem to be solved by the invention]

As described above, the conventional method of joining precast foundation beams is to fill the joint concrete into the joint concave portion 4 formed in the end face 3 of each foundation beam 1 to form a joint concrete part, thereby obtaining shear strength. However, due to the difference in composition between the precast panel portion and the cast-in-place portion, there have been cases in which sufficient shear strength cannot always be obtained by using only the sheaco turret portion.

Therefore, an object of the present invention is to provide a precast foundation beam joining device that can maintain sufficient shear strength.

[Means to solve the problem]

In order to achieve the above object, in the present invention,
Forming a cotter recess on each end face of the adjacent precast foundation beams, and providing a cotter recess or a joint locking means such as a protruding reinforcing bar near the side surfaces forming the corners of each of these end faces adjacent to each other,
Joint concrete is poured to cover the corner end face and each of the above-mentioned locking means.

[Effect]

According to the present invention, by placing joint concrete at each of the joints, in addition to the joint concrete formed by the joint concave portions on the end faces of each foundation beam, the joint concrete can be added to the joint concrete concave portions or protruding reinforcing bars on the side surfaces of the foundation beams. With the joint force obtained by the joint locking means such as the above, it is possible to make the joint part maintain significantly enhanced shear strength.

〔Example〕

The present invention will be described below with reference to the embodiment shown in FIG. Figure a shows an L-shaped joint, in which a plurality of concave recesses 4 are formed in advance along the longitudinal direction on each end face 3 of adjacent precast foundation beams 1, 1, and each of these foundation beams is A plurality of concave recesses 8 for trapping are set along the longitudinal direction in the vicinity of the side surfaces 7 of the adjacent side surfaces 1, that is, the respective side surfaces 7 forming the respective corner portions 6 of the end surfaces 3 adjacent to each other. ing. Then, joint concrete 5 is cast to cover each of the concrete recesses 4 and 8 on each end face 3 and side face 7. At this time, the reinforced concrete portion to be cast across the supplementary concave portion 8 is indicated by the dotted line 9.
It is also possible to add more concrete to the shape of a column, as shown in the figure below.

According to the above configuration, each foundation beam 1 is reinforced and joined by a sheaco starter part formed by its side cotter recesses 8 in addition to a sheaco stator part constituted by its end face side cotter recesses 4. Therefore, this L-shaped joint can maintain an extremely large shear strength compared to conventional joints.

Next, in the T-shaped joint shown in FIG. In addition, in the cross-shaped joint shown in Figure 1c, each foundation beam 1 has two foundation beams 1 adjacent to each other, so each foundation beam 1 has a A supplementary concave portion 8 is formed in each of the holes.

It is clear that these T-shaped joints and cross-shaped joints can also have significantly enhanced shear strength, similar to the L-shaped joint shown in FIG. 1a.

Furthermore, FIG. 1d shows a protruding reinforcing bar 8a that is provided in place of the supplementary concave portion 8 formed on the side surface of the foundation beam 1. 8, the joint portion can be strengthened.

〔Effect of the invention〕

As described above, according to the present invention, the joints of adjacent foundation beams are reinforced and joined by the sheaco stutters near the side surfaces as well as the sheaco stutters on the end faces of the beams, so the shear strength of the joints can be significantly increased. effective.

[Brief explanation of drawings]

1A to 1D show embodiments of the present invention, in which FIGS. 1A, 1B, and 1C are plan views showing different joint modes, and FIG. 1D shows a modification of the joint locking means. Similar plan views, Figure 2 is an elevation view of a conventional wall-type precast reinforced concrete building, Figure 3 is a plan view showing how the foundation beams are connected, and Figure 4 is a vertical view of wall panels on these foundation beams. The elevational views of FIGS. 5a, b, and c showing the erected state are plan views corresponding to FIGS. 1a, b, and c showing the joints of conventional foundation beams. DESCRIPTION OF SYMBOLS 1...Foundation beam, 3...End face, 4...Cotter recess, 6...Corner part, 7...Side surface, 8, 8a...Joint locking means.

Claims (1)

[Claims] 1. In addition to forming a cotter recess on each end face of adjacent precast foundation beams, a cotter recess or a joint locking means such as a protruding reinforcing bar is provided in the vicinity of the side surfaces of each beam forming the corners of the adjacent end faces. 1. A precast foundation beam joining device, characterized in that a joint concrete is placed covering each of the end faces and each of the joining and locking means.