JPH01203538A - Junction structure of reinforced concrete construction - Google Patents

Abstract

PURPOSE:To obtain a junction structure with high rigidity by securing iron hoops at right angles along splice reinforcing bars or iron ribs to the ends of the splice reinforcing bars which splice with lap joints of main reinforcements and have allowance lengths against lap lengths, and performing the formation of the title construction. CONSTITUTION:Splice reinforcing bars 1 having allowance lengths against lap lights of main reinforcements 5a and 5b are spliced with lap joints by lapping main reinforcements adjacent to each other. Iron hoops 2 or iron ribs are secured to the ends of splice reinforcing bars 1 at lightangles along the splice reinforcing bars 1. According to the constitution, main reinforcements 5a and 5b are prevented to over-extension at overlap joints, and fixing between main reinforcements 5a and 5b is increased so that a junction structure with high rigidity can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) When constructing a reinforced concrete structure, the present invention is designed to connect main reinforcements of columns to each other as concrete is poured in sequence.
Or a joint structure of reinforced concrete in which the main reinforcements of beams are connected to each other to extend the main reinforcements, more specifically, joints of reinforced concrete structures characterized by joints of reinforcing bars in which the main reinforcements are overlapped in the vertical and horizontal directions and extended integrally by joints. Regarding structure.

(Prior Art) Joints made by pressure welding or welding are difficult to construct in rainy weather, and the larger the diameter of the main reinforcement, the longer the time required, resulting in higher costs.

In the case of lap joints, in order to sufficiently transmit the main reinforcement stress,
The overlap length is sufficiently long. Compared to quality control of pressure welding or welding locations, lap joints are superior in that they can be visually checked and controlled.

(Problems to be Solved by the Invention) However, although lap joints are advantageous in terms of workability, they still have a drawback in their fixing strength compared to joints using pressure welding, such as gas pressure welding joints.

In view of these points, the purpose of the present invention is to provide a lap joint that can be easily constructed without pressure welding or welding, and has a highly reliable joint structure that can sufficiently transmit stress from the main reinforcement. .

(Means for Solving the Problems) In order to achieve the above object, the joint structure of a reinforced concrete structure according to the present invention includes a joint structure for a reinforced concrete structure in which the main reinforcements are attached to a lap joint portion where the main reinforcements are overlapped adjacently. A splint reinforcing bar having an extra length relative to the overlapping length is arranged, and an iron plate hoop or steel plate reinforcing bar is directly fixed to the end of the splint reinforcing bar so as to be perpendicular to the axial direction of the splint reinforcing bar.

(Function) Splinter reinforcing bars prevent the main reinforcing bars from springing out in areas where they overlap, increasing toughness.

In addition, the stress applied to the joints between the main reinforcements is partially borne by the support reinforcing bars and is received by the iron plate hoops at the ends of the support reinforcements, resulting in improved anchoring performance at the joints of the main reinforcements.

(Embodiments) Preferred embodiments of the present invention will be described below with reference to the drawings.

Figures 1 and 2 show the assembled reinforcing bars 3-3a of the splice reinforcing bars 1 and the iron plate hoop 2, and the assembled reinforcing bars 3 in Fig. 1 (a) have an overlapping length α where the main bars are adjacent to each other. Two reinforcement reinforcing bars 1 having an end extra length β of about 3 are fixed in parallel at the center of each side of an iron plate hoop 2 bent into a square closed cross section.

The iron plate hoop 2 has a closed cross section to make it resistant to twisting. Furthermore, the means for fixing the splint reinforcing bars 1 is welding, and the iron plate hoops 2 are located at the left and right ends of the splint reinforcing bars 1, respectively. This is because when the iron plate hoop 2 is pulled outward, the extra length β end portion of the support reinforcing bar 1 is restrained by the iron plate hoop 2 and becomes difficult to bend.

Further, in order to increase the fixing force of the iron plate hoop 2, the iron plate hoop 2 may be arranged in a ``field'' shape as shown in FIG. 1(b).

Furthermore, the arrangement of the supporting reinforcing bars 1 fixed to the iron plate hoop 2 may be, for example, assembly reinforcing bars 3a as shown in FIG. That is, two parallel reinforcing bars 1a-1a are arranged at each corner of the iron plate hoop 2 bent into a square shape and at the center of each of the opposing upper and lower sides.

The position and number of the supporting reinforcing bars 1, like the assembly reinforcing bars 3 and 3a, may be freely determined depending on the arrangement position and number of the main reinforcing bars and the moment acting on the columns and beams.

The intermediate portion of the support reinforcing bar 1 sandwiched between the iron plate hoops 2-2 is restrained by the hoop bars 4.

As explained above, there is no necessity to configure the assembly reinforcing bars 3.3a in advance, but for the convenience of improving workability, the splint reinforcing bars 1, etc. are made into the assembly reinforcing bars 3, 3a.

A joint structure using the assembled reinforcing bars 3a described above will be explained with reference to FIG. 3 and the following figures. The figure shows a case in which the main column reinforcing bars 5 are overlapped on the slab 6, and the main column reinforcing bars 5b on the upper floor side are overlapped and joined to the upper end of the main column reinforcing bars 5a on the lower floor side, and concrete is poured.

The construction procedure is to overlap and splice the column main reinforcements 5b onto the column main reinforcements 5a, cover the assembled reinforcing bars 3a so as to cover the column main reinforcements 5b, and lower them as they are.

The support reinforcing bars 1 are attached to the column main reinforcements 5a according to each interval of the column main reinforcements 5a.
-5b are parallel to the adjacent overlapping portions. An example of this overlapping portion, that is, the overlapping length α, is as follows.

Column main reinforcement is D35 (SD35), F c-240kg/
If it is C-, the total length of the splice reinforcing bar 1 may be 1.400 m+*, and the overlap length α may be approximately 880III11.

Therefore, a surplus length of 260 W or more is sufficient. Further, the diameter of the splice reinforcing bar 1 is sufficient to be D16.

Therefore, compared to conventional lap joints, less steel can be used and the lap length can be shorter.

The assembly reinforcing bars 3 described above can also be applied to the beam main reinforcing bars 7. The construction procedure is outlined in Figure 4 (a) and (b).
As shown. The beam main reinforcements 7b are assembled so that the beam main reinforcements 7b to be added later run parallel to the supporting reinforcing bars 1 of the assembled reinforcing bars 3b, and the assembled reinforcing bars 3b are fitted into the ribs 9 of the reinforcing bars 3b, that is, into the beam main reinforcements 7b. While lowering it in that state, one end of the beam main reinforcement 7b is overlapped with the end of the already assembled beam main reinforcement 7a, and then the reinforcing bars 3b are assembled laterally in the area where the ends of the beam main reinforcements 7a and 7b overlap. It is drawn and covered.

In this case, the assembled reinforcing bars 3b are not steel plate hoop 2° hoop bars 4, but steel plate stirrups 8 are used at both ends of the splice reinforcing bars 1 as reinforcing bars against the shearing force applied to the upper and lower beam main bars 7, and cost reinforcements are used in the middle part. 9 is used.

When the assembled reinforcing bars 3b are used in the overlapped joints of the beam main reinforcements 7 and the construction is performed as described above, the workability is improved because the lateral movement operation of the crane to move the beam main reinforcements 7b laterally while lowering them is not required.

It should be noted that although there is no necessity to assemble the splice reinforcing bars to form the reinforcing bars 3, it is thought that workability will be better if they are assembled in advance as in the described embodiment.

By constructing the reinforcing steel structure as described above and pouring concrete, the joint structure of the present invention can be obtained.

(Effects) As explained in detail above, the reinforced concrete structure 9 joint structure according to the present invention has a basic structure of a lap joint in which main reinforcements are overlapped adjacent to each other, and since no fire is used, it is not affected by the weather. Therefore, it is possible to shorten the construction period. and,
Since the reinforcement reinforcing bars are arranged in this overlapped length part, the toughness of the overlapped part is improved, and the overlap length between the main reinforcements can be adjusted depending on the extra length and diameter of the reinforcement reinforcement, and the moment used for columns and beams is Joints can be made according to characteristics.

Furthermore, since steel plate hoops or steel plate reinforcing bars are fixed to the ends of the splint reinforcing bars so as to be orthogonal to the splint reinforcing bars, the splint reinforcing bars have sufficient anchoring force to the outside of the joint, and the end hoops Since the reinforcing bars or ribs are made of iron plates, it is possible to suppress the springing out of the main reinforcing bars and improve the anchoring performance between the main reinforcing bars.

Splint reinforcement bars are restrained in parallel by hoop reinforcements and cost reinforcements, and work together with the main reinforcement bars and other parallel reinforcement bars to resist shearing forces, so there is no need to make them the same diameter as the main reinforcement bars, and the overlap length can also be adjusted. It is possible to adjust the actual aPJ during reinforcement construction, making quality control easier.The larger the diameter of the main reinforcement, the more advantageous it is in terms of workability, quality control, and amount of reinforcing bars used compared to pressure weld joints and conventional lap joints. play.

[Brief explanation of the drawing]

The figures are all examples, and FIG. 1(a) is a perspective view of assembled reinforcing bars used in the present invention, FIG. 1(b) is a perspective view illustrating the configuration of a steel plate hoop, and FIG. 2 is a separate perspective view. Figure 3 is a reinforcement diagram of the joint structure when applied to columns, and Figures 4 (a) and (b) are side views illustrating the joint structure when applied to beams. It is. 1...Splicing reinforcing bar 2...Iron plate hoop 3...Assembling reinforcing bar 4...Hoop bar 5...Column main bar 6...・・・
Slab 7... Beam main reinforcement 8...
Iron plate stirrup 9... Ribs Patent applicant Obayashi Co., Ltd. Kumijo Attorney Patent attorney - Ken Iro Interpolation
Patent Attorney Masatoshi Matsumoto Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] (1) A splint reinforcing bar with an extra length for the overlapping length of the main reinforcing bars is placed along the lap joint where the main bars are overlapped adjacently, and the splint reinforcing bar is attached to the end of the splint reinforcing bar. A joint structure for a reinforced concrete structure characterized by directly fixing steel plate hoops or steel plate reinforcing bars so as to be orthogonal to the axial direction of the reinforced concrete structure.