JP2928952B2 - Joint structure between half precast concrete beam and column and its joining method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of joining a half PCa beam and a column in which a reinforcing bar at a joint between a half precast concrete (hereinafter referred to as a half PCa) beam and a column is improved. It is about.

[Problems to be solved by conventional technology and invention]

Reinforced concrete construction by the conventional construction method involves assembling the formwork, arranging the reinforcement, placing the concrete, removing the formwork, etc., all of which are on-site work, so there are many manpower work, the cost of the formwork construction increases, the construction period is prolonged, etc. Therefore, the use of PCa in the structure has been gradually spread.

Therefore, when converting the beam to PCa and joining it to both sides of the column,
Conventionally, the joint edge of the half PCa beam is generally opposed at the joint of the beam and the column, and the lower streaks extending from both the joint edges are extended upward by 90 ° near the joint edge on the opposite side beyond the center of the column In this method, a hook is formed by forming a hook, and concrete is poured into this joint to embed the hook, and the PCa beam is joined to the column.

However, in this method, if both half PCa beams are manufactured with the same specifications, the lower streaks of both half PCa beams will come to the same position both planarly and three-dimensionally and will interfere with each other. It is necessary to make things with staggered streaks,
In addition, this also changes the size of the stirrups on both beams, making it difficult to manufacture half PCa beams and to respond on site.

In addition, besides the above method, at the beam / column joint, each lower streak extending from both small edges of the opposing half-PCa beam is bent upward at approximately 90 ° above the center of the column, and spiral A beam-column connection method has been proposed in which a bar is wound and concrete is poured into this joint. However, according to this method, it is difficult to fit the reinforcing bar of the half-PCa beam in the other direction perpendicular to the beam.

Also, it is difficult to join the half PCa beam in the other direction that crosses the half PCa beam in the other direction crossing the half PCa beam as a through beam without joining at the column capital Therefore, if the half PCa beam at the column capital is formed in a cross shape, the weight becomes excessively large, and handling such as transportation and lifting becomes difficult.

The present invention has been made to solve the above-described problem of joining the conventional half PCa beam and column,
The fitting of the rebar at the joint between the half PCa beam and the column is good, and the joint strength is high, and the column can be applied to any column of the half PCa column method or the full PCa column method as well as the conventional formwork method, It is also an object of the present invention to provide a joint structure between a half PCa beam and a column which can be applied to a cross beam, a straight beam, and a T-shaped beam, and a joining method thereof.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a unidirectional half precast concrete beam joined to a column, in which a streak is formed below each joint edge of both opposing half precast concrete beams. A hook that is extended downward not to exceed the center of the column and bent 90 ° downward is formed, and the half precast concrete beam in the other direction crossing the above half precast concrete beam is connected to each of the two opposite half precast concrete beams. Hooks formed by extending the streaks downward from the fore edge to a length not exceeding the center of the column and bending upward by 90 ° are formed, and a pair of downward facing 90 ° hooks of each of the one-way half precast concrete beams are opposed to each other. , And each pair of opposing 90 ° upward hooks of half precast concrete beams intersecting with each other The half PCa beam and column joint structure, in which the sleeves and hooks are embedded and joined in concrete cast into the beam and column joints, and the beam and column joints On both sides in one direction, a pair of half precast concrete beams that form hooks that extend downward from the joint face and extend downward from the center of the column to a length that does not exceed the center of the column and are bent downward 90 °, face both joint faces Then, insert each pair of opposing hooks on the joint face of both half precast concrete beams into the sleeve, and in the direction intersecting the one-way half precast concrete beam, lower the streaks from the joint face. Extend upward not to exceed the center of the pillar
一 対 A pair of half precast concrete beams with bent hooks are hung on both sides of the beam and column joint in the direction intersecting with the two small joints, with the small joints facing each other. Insert each pair of opposite hooks of the surface into a separate sleeve from the above, respectively,
It is characterized by the method of joining half PCa beams and columns, which is characterized by placing concrete and joining the beam and column joints.

[Action]

As described above, according to the present invention, the half PCa beam in one direction connecting to the column and the half PCa beam in the other direction intersecting with the column are provided with each lower streak, and the center of the column from each connecting small face of the two opposite half PCa beams. The opposite PC bar in one direction is bent 90 ° downward, and the counter lower bar in the other direction is bent 90 ° upward to form a hook. Even if you do not make it, there is no interference between opposite lower streaks,
Even at the joint of the beam in the two directions of the cross, the reinforcing bar fits well, and each pair of opposing hooks is inserted into the sleeve respectively and embedded in the concrete cast at the beam and column joint, so Thus, the effect of restraining the hooks is obtained, and a strong and reliable joining strength can be obtained.

〔Example〕

Hereinafter, the present invention will be described in detail based on one embodiment shown in the drawings.

FIGS. 1 to 5 sequentially show steps of joining a half-PCa half beam in two directions to a column by the method of the present invention. The method of the present invention will be described below with reference to the drawings. First, reinforced concrete columns 1 are built on the lower slab. This pillar 1 can be a conventional construction method in which cast-in-place concrete is cast into a formwork and a concrete form is removed after hardening, or a half PCa column in which concrete is cast into a PCa formwork and a PCa formwork is left. It may be a full PCa pillar manufactured in all factories.

The pillar 1 has a height up to the lower part of the beam on the upper floor, and the main bar 1a extends above the slab surface on the upper floor. Reference numeral 1b denotes a hoop, and no reinforcement is provided at the main bar 1a extending upward from the capital.
Reference numeral 2 denotes a sleeve embedded in the upper end surface of the column 1 (see FIG. 6).
Then, the half PCa in one direction of the cross to be joined to both sides of the pillar 1 after this
Arranged in the transverse direction of the beams 3, 3 at the same interval as the lower streak 3a of the half PCa beam 3, and at the time of placing the pillar concrete, put a bottom plate to prevent concrete from entering the sleeve 2 and cast concrete. Has been done. As the sleeve 2, a spiral sleeve used for a ventilation duct or the like can be used.

After pillar 1 is built, half PCa beam in one direction of cross on both sides of pillar 1
Hang 3,3. This half-PCa beam 3 is extended downward from the beam forehead by extending the lower streak 3a with a length not exceeding the center of the column.
A hook 3b bent by 90 ° is formed, and the pair of opposite hooks 3b, 3b of the two half-PCa beams 3, 3 is inserted into the respective sleeves 2 of the capital by the suspension of the half-PCa beams 3. 3c in the figure
Is an upper streak of the beam 3, 3d is a stirrup, and 3e is a cotter formed on the joint edge (FIGS. 1 and 2).

After the half PCa beams 3 in the cross direction are suspended, the half PCa beams 4 in the other cross direction are suspended. The half PCa beam 4 is formed with a hook formed by extending the lower streak 4a by a length that does not exceed the center of the column and bending it upward by 90 °. The sleeve 5 (see FIG. 7) is inserted into each pair of hooks 4b of the beams 4, 4 facing each other. The sleeve 5 is formed by vertically penetrating the concrete to be poured into the joint so that the concrete can be well turned into the sleeve 5. 4c in the figure is the same beam 4
The upper streak, 4d is a stirrup, and 4e is a cotter formed on the fore-edge surface (FIGS. 3 and 4).

After the suspension of the half PCa beams 3,3,4,4 in both directions of the cross,
The hoop 1b is arranged on the column main bar 1a extending from the capital, and the upper struts 3c, 3c, 4c, 4c, 3c, 3c, 4c, between the joint fronts of the half PCa beams 3, 3, 4, 4 in both directions of the cross. 4c is laterally moved, and concrete 6 is cast integrally between the small joint surfaces, the upper surfaces of the half PCa beams 3, 3, 4, 4 and the slab. The concrete 6 consists of cotters 3e, 4e and hooks 3 of both half PCa beams 3, 3, 4, 4.
b, 4b are inserted into the sleeves 2, 5 and half PCa beams 3,
4 and column 1 are firmly joined to each other (FIG. 5).

In the case of the method of casting column concrete and slab concrete at the same time, the sleeve 2 for inserting the hook 3b bent downward by 90 ° is supported in the column formwork, and a half PCa in both directions of the cross is provided on the upper end of the column formwork. Support beams 3 and 4,
Pour concrete into columns and slabs at the same time. In this case, the bottom of the sleeve 2 into which the hook 3b of 90 ° downward is inserted does not have a bottom.

In addition, the deck plate supported on the beam can be used for the conventional slab in which concrete is poured into the formwork and the formwork is removed after the concrete is hardened, or in the half-PCa slab where the half-PCa slab remains as it is. Any of the slabs of the deck plate method in which concrete is poured into the slab may be used.

〔The invention's effect〕

As described above, the present invention achieves the rationalization of construction by converting the beam to half PCa, and the half PCa in one direction joining to the column and the other direction crossing the column.
Each lower streak of the beam is extended from each joint face of both half PCa beams facing each other for a length not exceeding the center of the column, and the lower streak in one direction is bent downward 90 °, the other direction Since the opposite lower streak was bent upward 90 ° to form a hook,
Even if the reinforcing bars of the PCa beams are not shifted, there is no interference between the lower bars facing each other, and the reinforcing bars can be fitted well even at the joint of the beams in two orthogonal directions, greatly improving the workability at the site. ,
In addition, the productivity of half PCa beam fabrication is improved.

In addition, each pair of opposing hooks is inserted into the sleeve and embedded in concrete cast at the joint between the beam and the column, so that the effect of restraining the opposing hooks is generated, and strong and reliable joining strength is obtained. .

In addition, the beams to be joined are not limited to the two-way cross beam described in the embodiment, but also the beam in one direction on both sides of the column and the beam to be joined to the column in the T-shape direction. By omitting the above, the present invention can be implemented and a wide range of responses can be achieved.

[Brief description of the drawings]

The drawings illustrate one embodiment of the present invention, and FIGS.
FIG. 1 is a sectional view showing a state in which a half-PCa beam in one direction is suspended on both sides of a pillar, and a step of joining a half-PCa half beam in a two-way cross to a pillar by the method of the present invention. 2 is a partially cutaway plan view of the same as above, FIG. 3 is a vertical sectional view of a half PCa beam with a cross in the other direction suspended on a pillar, and FIG. 4 is a partially cutaway plan view of the same as above. The illustration shows a two-way half cross on a pillar
Sectional view of the state where the PCa beam was joined and the construction was completed.
The figure is an elevational sectional view of a sleeve in which a downward 90 ° hook is inserted, and FIG. 7 is an elevational sectional view of a sleeve in which an upward 90 ° hook is inserted. 1 ... pillar, 2,5 ... sleeve, 3 ... half-precast concrete beam in one direction of cross, 3a, 4a ... bottom rib, 3b,
4b: hook, 4: half precast concrete beam in cross direction, 6: concrete.

Claims (2)

(57) [Claims] The unidirectional half precast concrete beam to be joined to the column is formed by extending the streaks downward from each joint face of the opposing half precast concrete beams by a length not exceeding the center of the column.ハ ー フ A bent hook is formed and the half precast concrete beam in the other direction crossing the half precast concrete beam is
Hooks are formed by extending the streak from each joint face of both opposing half precast concrete beams downwardly to a length not exceeding the center of the column and bending upward by 90 °, and forming the hook of the one-way half precast concrete beam. Each pair of facing 90 ° downward hooks and each pair of facing upward 90 ° hooks of the half-precast concrete beam crossing each other are inserted into the sleeve, respectively, and the concrete cast at the beam / column joint. A joint structure between a half-precast concrete beam and a column, wherein the sleeve and the hook are embedded and joined to each other. 2. A pair of hooks formed on both sides of a column beam and a column joint in one direction by extending a lower streak from the joint edge to a length not exceeding the center of the column and bending downward by 90 °. The half precast concrete beam is hung with the two small joint faces facing each other, and each pair of opposed hooks of the small joint face of the two half precast concrete beams is inserted into the sleeve, respectively, to the one-way half precast concrete beam. In the intersecting direction, a pair of half precast concrete beams that form a hook that is bent upward by 90 ° by extending the lower streak from the joint front not to exceed the center of the column, with both joint fronts facing each other A beam in a direction intersecting with said direction,
Hanging on both sides of the column joint, insert each pair of opposing hooks on the joint face of both half precast concrete beams into separate sleeves from the above, cast concrete into the beam and column joints and join The method of joining half precast concrete beams and columns characterized by the following.