JPS587788B2 - Connection method for concrete structures - Google Patents

Description

[Detailed Description of the Invention] For joining joints of concrete structures, for example, as shown in Fig. 3, the exposed part of the reinforcing bar b buried in the pre-cast concrete a is shown by a solid line along the end face. A commonly used construction method is to bend the concrete in the following manner, stretch it, roughen the joint surface C, and pour concrete for the later poured part. There are disadvantages such as the fact that it takes a lot of effort and time to straighten the reinforcing bars that have been bent and to roughen the surface of the pre-cast concrete.

In order to more effectively counter the shear force applied to the connecting surface between pre-cast concrete and post-cast concrete of a concrete structure, this invention forms an uneven joint on both connecting surfaces, and Within this convex concrete, both reinforcing bars are connected with a highly rigid connector,
Moreover, it relates to a connection method in which a synergistic effect is achieved between the convex concrete and the connector by arranging the connector so that it is located on the shear plane. , 1 has a screw 2 on one end, bends the other end into a U shape, and makes a connecting reinforcing bar whose length from the sheared surface is 15 to 20 times the diameter of the reinforcing bar.
indicates a connector.

In this invention, the connecting reinforcing bars and connecting tools are used to construct, for example, an underground continuous wall and post-cast columns and beams. First, as shown in Fig. 1, the pre-cast concrete is When pouring A, set up the formwork so as to form a concave part C in particular to the connection surface B with the post-cast concrete, so that the screw 2 of the connecting reinforcing bar 1 is located in the concave part C. After pouring the concrete, remove the formwork to expose the screw 2 in the recess C, and connect the screw 2' of the connecting reinforcing bar 1 to the post-cast concrete to the screw 2 with a connecting tool 3, for example, which has higher rigidity than the reinforcing bar. , Continue screwing with a high nut with a female thread cut on the inner surface, and fix this part by welding if necessary. Then, pour concrete A' after pouring to form a convex part D joint with a concave part C. At the same time, within this convex portion D, the connecting tool crosses the shear X-Y between the two and connects them together.

The arrangement of the recesses and connecting reinforcing bars is determined as appropriate depending on the scale of the continuous wall, etc., but for example, as shown in Figure 2, several recesses (the one shown is four) are arranged in one square recess. ).

In the continuous wall constructed as described above, the connecting surface is not straight, and the convex portion of the later poured concrete connects to the concave portion of the pre-cast concrete, and the shear force on the connecting surface is received at the convex portion. In addition, special effects such as the ability to further increase the yield strength are achieved by having the connecting tool that connects both of the connecting reinforcing bars cross the shear plane within the convex portion.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view, FIG. 2 is a connecting end view of FIG. 1, and FIG. 3 is a partially plan view showing an example of a conventional construction method. 1.1'...Connection reinforcing bar, 2,2'...Screw, 3...Connector, A...Pre-cast concrete, B...Connection surface, C...
Concave part, D...Convex part, A'...Post-cast concrete, X-
Y...Shear plane.

Claims (1)

[Claims] 1. When connecting concrete structures to each other, a recess is provided on the surface of the connection point of the pre-cast concrete, the end joint screw of the connecting reinforcing bar is exposed in this recess, and the connecting reinforcing bar of the later-cast concrete is connected to this screw. After connecting the joints with threaded ends facing each other so that they cross the sheared surface, pour concrete afterward to form an overlapping surface between the convex concrete and the reinforcing bar joints on both joint sheared surfaces. A method for connecting concrete structures, characterized by: