JP2002212956A - Precast foundation joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a precast foundation joint structure which dispenses with embedding of a specially-manufactured joint metal for connecting precast foundations to each other, into concrete for the precast foundations. SOLUTION: The precast foundation 1 is formed by preliminary embedding reinforcements 6 in the concrete 4. The precast concrete also has joint plates 5 embedded therein so as to penetrate the precast concrete along its longitudinal direction. Both ends of each joint plate 5 function as joint portions 5a which protrude from respective end faces of the concrete.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a precast foundation in which a reinforcing bar is embedded in concrete.

[0002]

2. Description of the Related Art FIGS. 6A and 6B are a front view and a side view showing a conventional example of a precast foundation in which a reinforcing bar is embedded in concrete. In this precast foundation 21, the main reinforcement 2
In addition to the stirrups 3 and the stirrups 24, a plurality of joint hardware 25 for joining a reinforcing bar between adjacent precast foundations 21 are used. The fitting hardware 25 is shown in FIG.
As shown in the left end view and the front view in (A) and (B),
The metal plate 26 includes a metal plate 26 partially formed with a notch 26a, and a reinforcing bar 27 having one end inserted into the notch 26a and joined to the metal plate 26 by welding 28. Reinforcing bars 27 of the fitting hardware 25 are assembled to the upper and lower main bars 23 in the concrete 22, and a part of the metal plate 26 is projected from both end surfaces of the concrete 22 as a joint.

[0003]

However, the fitting hardware 25
For example, the notch 26a is formed in the metal plate 26 and the reinforcing bar 27 is welded.

An object of the present invention is to provide a precast foundation joint structure in which members for joining the precast foundations to each other can be easily manufactured and cost can be reduced.

[0005]

According to the precast joint structure of the present invention, in a precast foundation in which a reinforcing steel is embedded in concrete, a joint plate having joints at both ends is penetrated into the concrete along the longitudinal direction. In this state, the joints at both ends are projected from the concrete end face. According to this configuration,
By joining the joints projecting from the concrete end face to each other, the joining of adjacent precast foundations is performed. The joint member may be one single member joint plate, and the joint portions at both ends can be obtained by one joint plate. Therefore, unlike conventional fittings of a welded assembly, there is no need to perform processing or welding, and there is no need to separately provide both ends, and work such as rebar assembly can be simplified. Since the joint plate penetrates into the concrete in the longitudinal direction, the amount of steel material used increases, but the cost is reduced in view of the processing and welding labor. Since the joint portions at both ends are formed by one penetrating joint plate, accuracy is improved even in the case of a short-cast precast foundation.

In the precast foundation joint structure of the present invention, the precast foundation may be a cloth foundation. In the case of such a precast cloth foundation, the effect of cost reduction by the joint plate penetrating both ends is great.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. 1 and 2 show a front view and an end view of a precast foundation having a joint structure according to this embodiment. This precast base 1 has a base section 3 below a rising section 2 and has a general vertical cross section of inverted T.
It is a letter-shaped cloth foundation. In the rising portion 2, joint plates 5, 5 are embedded vertically in the concrete 4 in a penetrating state along the longitudinal direction. Both ends of these joint plates 5 project from the end face of the concrete 4,
It becomes the joint portion 5a. The joint plate 5 is a band-shaped member such as a flat steel, and is embedded with its width surface oriented vertically. Each joint part 5a is provided with a joint hole for inserting a bolt or the like. The portion of the joint plate 5 in the concrete 4 also serves as a main reinforcement, and a plurality of stirrups 6 are assembled to the upper and lower joint plates 5 in the concrete 4. 1 and 2, the arrangement of the reinforcing bars of the base portion 3 is omitted. As shown in a perspective view in FIG.
A plurality of base reinforcements 7 extending in the longitudinal direction of the base and a plurality of base reinforcements 8 intersecting with the base reinforcements 5 and extending in the width direction of the base are arranged in the concrete 4 of the base portion 3. The lower part of the stirrup 6 is bent in the direction of the base width along the base reinforcing bar 8 and is assembled to the base reinforcing bar 8.

[0008] The precast base 1 constructed as described above.
Are joined by a joint 5a of a joint plate 5 protruding from the end face of the concrete 4 in joining with the adjacent precast foundation. Thus, the joint plate 5
Unlike conventional fittings for welded assemblies, there is no need to perform machining or welding, and there is no need to separately install at both ends, making work such as rebar assembly simple. I'm done. Since the joint plate 5 penetrates into the concrete 4 in the longitudinal direction, the amount of steel material used increases, but the cost is reduced in view of the processing and welding labor. One penetrating joint plate 5 with joints 5 at both ends
Since a and 5a are configured, accuracy can be improved in the case of a precast base made of short members.

FIG. 4 shows an end view of a precast foundation 1A according to another embodiment. This precast foundation 1A
Is a half-precast foundation having a rectangular cross section to be the rising portion 2 of the fabric foundation, and the fabric foundation is constituted by the base portion 3 made of cast-in-place concrete. Also in the case of this precast foundation 1A, joint plates 5 and 5 are buried in the concrete 4 in a vertically penetrating state along the longitudinal direction. Both ends of these joint plates 5 protrude from the end face of the concrete 4 to form joints. The joint plate 5 is a band-shaped member such as a flat steel, and is embedded with its width surface oriented vertically. A plurality of stirrups 6 are attached to the upper and lower joint plates 5. A plurality of base reinforcements 7 extending in the longitudinal direction of the base and a plurality of base reinforcements 8 intersecting with the base reinforcements 5 and extending in the base width direction are arranged in the concrete 4 of the base portion 3. Stirrup 6
Is assembled to the basic reinforcing bar 7, for example.

In the case of this precast foundation 1A, similarly to the case of the previous embodiment, in joining with the adjacent precast foundation 1A, the end of the joint plate 5 protruding from the end face of the concrete 4 is used as a joint. Can be joined.

FIG. 5 shows an end view of a precast foundation 1B according to still another embodiment. The precast foundation 1B is a foundation beam having a rectangular cross section. In this case, two joint plates 5, 5 arranged vertically in the foundation 4 in the concrete 4 are buried in a penetrating state. A plurality of stirrups 6 are attached to these four joint plates 5. The fact that both ends of each joint plate 5 project from both end surfaces of the concrete 4 to form joints is the same as in the previous embodiments.

[0012]

According to the precast basic joint structure of the present invention, joint plates having joints at both ends are embedded in the concrete in a penetrating state along the longitudinal direction, and the joints at both ends are projected from the concrete end face. Therefore, there is no need to perform welding or processing for the welding in the production of the joint member for joining the foundations together, so that the configuration is simple and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a precast foundation provided with a joint structure according to an embodiment of the present invention.

FIG. 2 is an end view of the precast foundation.

FIG. 3 is a perspective view of the precast foundation.

FIG. 4 is an end view of a precast foundation according to another embodiment of the present invention.

FIG. 5 is an end view of a precast foundation according to still another embodiment.

FIG. 6A is a front view of a conventional example, and FIG. 6B is an end view thereof.

FIG. 7A is an end view of a metal joint used in the conventional example, and FIG. 7B is a front view thereof.

[Explanation of symbols]

 1, 1A, 1B ... precast foundation 4 ... concrete 5 ... joint plate 5a ... joint part

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masaaki Suzuki 3-5-5 Umeda, Kita-ku, Osaka-shi, Osaka Daiwa House Industry Co., Ltd. F-term (reference) 2D046 BA24

Claims (2)

[Claims] In a precast foundation in which a reinforcing bar is embedded in concrete, a joint plate whose both ends are joints is embedded in the concrete in a penetrating state along the longitudinal direction, and the joints of both ends are inserted from the concrete end face. Precast basic joint structure protruding. 2. The precast joint structure according to claim 1, wherein said precast foundation is a cloth foundation.