JPH0819716B2 - How to join precast reinforced concrete columns and beams - Google Patents

Description

The present invention relates to a method for joining precast reinforced concrete column beams.

[Prior Art] Conventionally, as a method for joining precast reinforced concrete columns and beams, JP-A-55-61632, 57-21641, and 61-
151346, Japanese Patent Publication No. 53-22769, 58-30459, 60-
Those described in Nos. 44459, 62-32299, 63-20973, etc. are known.

[Problems to be Solved by the Invention] In any of the above-described conventional joining methods, a precast reinforced concrete beam (hereinafter, also simply referred to as a beam) may be mounted on a column head of a precast reinforced concrete column (hereinafter sometimes simply referred to as a column). ) The lower end beam main bar exposed end is bent upward, and the bent part is surrounded by a reinforcing band, or the opposing bent parts are restrained and fitted with loop streaks or restraint hardware for each pair, and The entire curved portion was surrounded by reinforcing stirrups and cylindrical steel pipes.

However, according to the above-mentioned conventional method, the main reinforcement of the lower beam is set upward in the stigma, and a large number of rebars are forested / complexed within a narrow range. Not only is low, but also the filling property of the concrete placed on the column head is low, so that there is a drawback that the beam joint strength is reduced.

[Object of the Invention] Therefore, an object of the present invention is to provide a method for joining precast reinforced concrete column beams, which has a simple reinforcement structure of the column heads, which are beam joints, and which can obtain high anchorage performance of the main beam reinforcement. It is in.

[Means for Solving the Problems] The inventors of the present invention have reached the present invention as a result of extensive studies to achieve the above object.

That is, the method for joining precast reinforced concrete column beams according to the present invention is such that at least two precast reinforced concrete beams are mounted on the column heads of the reinforced concrete columns so as to face each other, and after the mounting, concrete is applied to the column heads. In the method of joining precast reinforced concrete column beams to be installed, anchor plates are preliminarily fixed to the exposed ends of the beam main bars of the precast reinforced concrete beams, respectively, and the anchor plates are mounted on the pillar heads so as to face each other. Is engaged with each corresponding side of a square-shaped strip-shaped engaged plate arranged inside the reinforced concrete column main bar of the column head.

A preferred embodiment of the method for joining precast reinforced concrete column beams according to the present invention is to form the plate-shaped strip-shaped engaged plate with a material having a strength higher than that of the beam main bar. The reinforcing bars of the rectangular bars and / or round bars arranged in a grid pattern on the inner side of the bar, and the reinforcing bars of the rectangular bars and / or round bars are formed of a material having higher strength than the beam main bar. is there.

[Operation] According to the present invention, when the beam is mounted on the column head so as to face each other, an anchor plate glued to the exposed end of the beam main bar of the beam is attached to the inside of the reinforced concrete column main bar of the column head. The beam main bars of the beams facing each other are coupled to each other by hooking and engaging with the corresponding sides of the square-shaped plate to be engaged, which are arranged in the above.

The bar arrangement structure in the stigma by the joining method of the present invention is a very simple structure, and the anchor plate is fixed to the exposed end of the beam main bar and the manufacture of the square-shaped engaged plate is carried out before carrying it to the site. Since preparation is possible in advance, it is possible to easily and swiftly perform on-site rebar work, and since the concrete can be filled well, the construction period can be shortened.

Further, by arranging reinforcing bars inside the engaged plate to reinforce it, the strength of the beam-column joint can be further increased.

Further, if the engaged plate (including the reinforcing bar when the reinforcing bar is provided) is made of a material having higher strength than the beam main bar, the beam main bar will not yield in the beam-column joint. It is possible to prevent the main beam reinforcement from extending from the beam-column joint, and improve the restoring force characteristics of the frame.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

1 and 2 are views showing a joint portion of a precast reinforced concrete column beam constructed by the method of the present invention, FIG. 1 is a transverse sectional view, and FIG. 2 is a longitudinal sectional view. Further, FIG. 3 is a schematic perspective view for explaining an engagement state between the exposed end portion of the beam main bar of the reinforced concrete beam and the plate-shaped engaged plate having a square shape.

In FIGS. 1 and 2, 1 is a precast reinforced concrete column or cast-in-place reinforced concrete column, and the precast reinforced concrete beam 2, 3 is attached to the head of the column.
Is mounted and joined. After mounting the beams 2 and 3, concrete 4 is placed on the head of the pillar. In the figure, 5 is the main pillar, 6
Is a column reinforcing strip of the column main reinforcement 5.

An anchor plate 11 is fixed in advance to each exposed end of the upper beam main bar 7 and the lower beam main bar 8 of the beam 2 and the upper beam main bar 9 and the lower beam main bar 10 of the beam 3, for example, in a factory. (See Figure 3).

The anchor plate 11 may be fixed to the exposed ends of the beam main bars 7 to 10 by any means as long as sufficient strength can be obtained. For example, the anchor plate 11 is fixed by welding. To form
A male screw is formed on the exposed end, and the exposed end is screwed and fixed to the through hole. A through hole is formed on the anchor plate 11, and the exposed end is inserted into the through hole, and then the end is inserted. Means such as screwing and fixing a nut on the anchor plate, forming a through hole in the anchor plate 11, inserting the exposed end portion into the through hole, and then bending and fixing the end portion can be used.

In the figure, the recessed portion 12 is reinforced when the anchor plate 11 is engaged with the engaged plate 13 described later and the engaged plate 13 is reinforced by arranging the lattice reinforcing bars 15 inside. It is for the rebar 15 to enter. Needless to say, the recess 12 is not necessary when the engaged plate 13 is not reinforced by the reinforcing bar 15.

The anchor plate 11 fixed to the exposed ends of the beam main bars 7 to 10 is hooked and engaged with the inside of the column main bar 5 of the head of the column when the beams 2 and 3 are mounted on the head of the column. A square band-shaped engaged plate 13 for joining is provided. Each side of the engaged plate 13 is formed with a recess 14 into which the beam main bars 7 to 10 enter when the anchor plate 11 is hooked and engaged. The inside of the engaged plate 13 is reinforced by arranging reinforcing reinforcing bars 15 in a grid pattern. The reinforcing bar 15 is not limited to the illustrated round bar, but may be a square bar or a mixture of both. The spacing between the lattices is preferably a spacing that does not impair the filling property when pouring concrete, for example, a spacing similar to that of the beam main bars 7-10. Engaged plate 13
The reinforcing strips 15 may be fixedly attached to the reinforcing plate 15 by the same method as the fixing of the anchor plate 11 to the exposed ends of the beam main bars 7 to 10, or by integral molding. The engaged plate 13
(Including the reinforcing bar 15 when the reinforcing bar 15 is provided)
In order to prevent the extension from the beam-column joint and to improve the restoring force characteristics of the frame, the strength of is higher than that of the beam main bars 7 to 10.

By hooking and engaging the anchor plate 11 with the engaged plate 13 having the above-described structure, the beams 2 and 3 are joined to the head of the column 1 and face each other without arranging the through bars or the like. The beam main bars 7 to 10 of the beam are connected.

The bar arrangement structure at the head of the column by the joining method of the present invention is extremely simpler than the conventional structure, and the anchor plate 11 is fixed to the exposed end portions of the beam main bars 7 to 10 or the square shape. Since the strip-shaped engaged plate 13 can be prepared in advance before it is brought into the site, it is possible to perform the spine work easily and quickly at the site, and since the filling property of concrete is good, the construction period can be shortened. Can be shortened.

Although one embodiment of the present invention has been described above with reference to FIGS. 1 to 3, in the present embodiment, four beams are formed into a cross-shaped pillar 1.
The case of mounting on the head (joining to the pillar 1) has been described, but the present invention is not limited to this, and the present invention can be applied to the case where the number of beams to be mounted and the mounting position are different from those of the present embodiment. I will get it.

[Advantages of the Invention] The bar arrangement structure in the stigma by the joining method of the present invention is an extremely simple structure and can obtain a high anchorage performance of the beam main bar, and the anchor plate is fixed to the exposed end of the beam main bar or the square shape. Since the belt-shaped engaged plate can be manufactured in advance before it is brought into the site, it is possible to easily and quickly perform the bar arrangement work on the site, and because the concrete filling property is good, the construction period can be shortened. Can be shortened.

Further, by arranging reinforcing bars inside the engaged plate to reinforce it, the strength of the beam-column joint can be further increased.

Further, if the engaged plate (including the reinforcing bar when the reinforcing bar is provided) is made of a material having higher strength than the beam main bar, the beam main bar will not yield in the beam-column joint. It is possible to prevent the main beam reinforcement from extending from the beam-column joint, and improve the restoring force characteristics of the frame.

[Brief description of drawings]

1 and 2 are views showing a joint portion of a precast reinforced concrete column beam constructed by the method of the present invention, FIG. 1 is a transverse sectional view, and FIG. 2 is a longitudinal sectional view. Further, FIG. 3 is a schematic perspective view for explaining an engaged state of the exposed end portion of the beam main bar of the reinforced concrete beam. 1: Pillars 2, 3: Beams 4: Concrete 5: Column reinforcements 6, Column reinforcement bars 7, 9: Upper beam reinforcements 8, 10: Lower beam reinforcements 11: Anchor plate 12: Recesses 13: B-shaped strip Composite plate 14: Recess 15: Reinforcing bar

Claims (4)

[Claims] 1. A method for joining precast reinforced concrete column beams, wherein at least two precast reinforced concrete beams are mounted on the column heads of the reinforced concrete columns so as to face each other, and after the mounting, concrete is placed on the column heads. , Anchor plates are pre-fixed to the exposed ends of the beam main bars of the precast reinforced concrete beams respectively, and when the anchor plates are mounted so as to face the column heads, the anchor plates are placed inside the reinforced concrete column bars of the column heads. A method for joining precast reinforced concrete column beams, which comprises hooking and engaging each of the corresponding sides of the arranged square-shaped strip-shaped engaged plates. 2. The method for joining precast reinforced concrete column beams according to claim 1, wherein the engaged plate in the shape of a strip is made of a material having a strength higher than that of the main beam. 3. The precast reinforced concrete according to claim 1, wherein the inner side of the plate-shaped band-shaped engaged plate is reinforced by arranging the reinforcing bars of square bars and / or round bars in a grid pattern. How to join columns and beams. 4. The method for joining precast reinforced concrete column beams according to claim 3, wherein the reinforcing bars of the square bars and / or round bars are formed of a material having a strength higher than that of the beam main bars.