JPH02229338A - Joining method for pc column/beam - Google Patents

Abstract

PURPOSE:To improve PC efficiency and workability by building each of PC beams into the head portion of a PC column from the both sides so that main outside reinforcements are matched to each other for direct joining and main inside reinforcements are inserted and fixed therein from the right and the left one after another. CONSTITUTION:A PC column 1 is built into and on the head portion thereof PC beams 2 in a ridge direction are built into from the both sides. Next, main outside reinforcements 2a are set in a mutually matching state and directly welded and main inside reinforcements are arranged with insertion from the right and the left one after another. Next, after a PC beam 3 in a beam space direction is built into and a hoop reinforcement 4a is arranged, cast-in-place concrete is placed in a panel zone (S).

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention is particularly applicable to precast reinforced concrete members such as columns and beams (hereinafter referred to as PC columns and beams) in the rigid frame prefabrication method.
This relates to the method of joining PC beams).

[Jubei's technology J Jubei's rigid frame prefabrication method, as shown in Figure 3A, involves manufacturing a precast reinforced concrete member with the joints of columns and beams integrated, and then manufacturing the third part on site.
As shown in the figure, there was a so-called column-type construction method in which buildings were constructed by piling them in. This construction method has some drawbacks, such as the construction and construction of the parts. On the other hand, PC columns and PC beams are manufactured and transported as single materials,
There is a construction method known as the single-member method, in which parts are joined on-site. Among these construction methods, for example, the method shown in Figures 4 (A) and (B) involves bending the upper bent reinforcing bars of the lower end beam main bars exposed and bent upward from the joint surfaces of the left and right PC beams within the panel zone. There are some types of reinforcement that are arranged facing each other, but this has problems such as insufficient anchorage and weak panel zones. In addition, as shown in #IJ5 diagrams (A) and (B), there is a method in which the exposed left and right straight lower end beam main reinforcements are welded butt to each other, but this is difficult to perform by welding. Not only that, but there is also the drawback that the binding force from welding remains. Furthermore, as shown in Figure 6 (A) and (B), there is a structure in which the main reinforcement at the lower end of the beam is exposed and bent upward, and the reinforcement is placed diagonally horizontally and inserted alternately from the left and right sides. However, this had the problem that the fixing properties were not common. Furthermore, in the case shown in Figures 7(A) and (B), the exposed and upwardly bent lower end beam main reinforcements are inserted alternately from the left and right sides in a straight state. The problem was that seven oaks were required for the beams, which wasted a lot. [The problem to be solved by the invention] The present invention has been made in order to solve the above-mentioned problems of the conventional method, and its purpose is to provide a single-material joining method applied to the rigid frame prefabrication method. Our objective is to provide a method for joining PC columns and beams that is painless, has a high conversion rate to PC, and has good workability. 1 Means for Solving Problem 1 The PC column/beam joining method of the present invention
PC beams are assembled into the head of the column from both sides, and among the plurality of straight lower end beam main reinforcements exposed from the joint end surfaces of each PC beam, the outer main reinforcements are butted against each other and directly joined. This is characterized by the fact that the inner main reinforcement, which has deviated towards the other side, is inserted alternately from the left and right sides and is fixed. [Example] An example of the present invention will be described below with reference to the drawings. In Figures 1 and 2, 1 is a PC column whose head is manufactured to the dimensions up to the bottom end of the beam, and its legs are manufactured to the length measured at the top of the beam (slab surface)*. 2 is P in column direction
It is a C-beam, and its plurality of lower end beam main reinforcements are exposed by bending them straight or upward into an L-shape at the joint end. Among the lower beam main reinforcements, the outer main reinforcement 2a is set to a length until its tip reaches the center of the panel zone S, while the inner main reinforcement 2b is set so that its tip exceeds the center of the panel zone S. Set the length so that it extends. In addition, the inner main reinforcement 2b
The reinforcement is placed in a position that is deviated to the side. In addition, the lower end reinforcing bars are arranged and exposed above the outer main reinforcing bars 2, and the upper folding self-reinforcing bars 2 are bent upward into an L shape.
Arrange the reinforcement at c. 3 is a PC beam in the tension direction, and the reinforcing bar 3a exposed at the joint end is bent upward or exposed straight. Incidentally, a thin layer cotter may be formed on the joint surfaces of the PC beams 2 and 3. The PC members 1, 2 and 3 manufactured as described above are delivered to the site and joined as follows. First, PC pillar 1
is erected in a predetermined position, and PC beams 2, 2 are erected in the girder direction from both sides on its head, and the outer main reinforcements 2a of the plurality of straight lower end beam main reinforcements are butted against each other and directly connected. Weld and place the inner main reinforcements 2b alternately from the left and right. Next, a PC beam 3 is erected in the tension direction from a direction perpendicular to the PC beam 2, and 7-ply reinforcement 4a is arranged, and finally, cast-in-place concrete 4 is poured in the panel zone S. and complete the joining. [Effect of the invention 1 (1) For joining the lower end main reinforcement of the PC beam within the panel zone,
Since we used a combination of the method of directly joining the bottom reinforcements and the method of anchoring the bottom reinforcements, we achieved a waste-free joining method that is superior to the rigid frame prefabricated construction method. (2) The PC conversion rate is a big deal. (3) Good workability. 《4》It is economical. 《5》Structurally, there is no pA buried. (6) High-rise buildings can be realized.

[Brief explanation of the drawing]

Figure Ij41 is a plan view of the joint part that implements the joining method of the present invention, Figure #42 is a cross-sectional view taken along the line ■1■ in Figure 1, and #1
Figure 3 and Figure 3A are explanatory diagrams of the column type one type, and Figure 4.
Figures 7(A) and 7(B) are explanatory diagrams showing examples of the single-material method. i-p c column, 2 ・P c beam, 2 a. 2 b-main reinforcement, 2c... upward bent reinforcing bar, 3... PC culvert, 3a.
...Reinforced steel, 4...Cast-in-place concrete, 4a...
7-P muscle, S...Bunnell zone. Patent creator Tokyu Koken Co., Ltd.

Claims (1)

[Scope of Claims] 1) PC beams are installed from both sides into the head of a PC column built on site, and among the plurality of straight lower end beam main reinforcements exposed from the joint end surface of each PC beam, A method for joining PC columns and beams, which is characterized in that the outer main reinforcements are butted against each other and directly joined, and the inner main reinforcements displaced laterally are inserted alternately from the left and right and fixed. 2) The method for joining PC columns and beams according to claim 1, wherein an upwardly bent reinforcing bar is provided above the outer main reinforcing bars of the straight lower end beam main reinforcing bars.