JPH06306930A - Connection structure of precast reinforced concrete construction - Google Patents

Abstract

PURPOSE:To give a sufficient connection strength against tension and horizontal shifting force with a simple structure. CONSTITUTION:A precast reinforced concrete structure 1 is provided with precast slabs 4 having hook-shaped connection rods 5 projected from the connection face 4b in one of connection 4a sides and anchoring rods 7 connected to a box-type connector 6 opened at least at the connection face 4d side in the other of connection 4c side. A floor slab 3 is placed on the upper part of one underside precast slab 4 and the box-type connector 6 of the other upperside precast slab 4 is inserted in the hook-shaped connection rods 5 projected upward from the floor slab 3 and then grout 8 is poured to connect them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for a precast reinforced concrete structure constructed by joining precast plates.

[0002]

2. Description of the Related Art A precast reinforced concrete structure is a construction method in which each structural element such as a wall, a beam and a floorboard is precast and assembled on site. In such a precast reinforced concrete structure, for example, there is a load-bearing wall as a precast plate, and the lower load-bearing wall and the upper load-bearing wall are joined together, but this joining is provided with a floor slab above the lower load-bearing wall, for example. A coupler embedded in the upper bearing wall is fitted into a joint line protruding upward from the floor slab, and a grout material is injected into the coupler for joining.

[0003]

In such a structure in which the coupler embedded in the upper bearing wall is fitted and joined to the joint rib protruding from the joint surface of the lower bearing wall as described above, for example, the joint rod is simply formed into a rod shape. Since the coupler is formed in a cylindrical shape, the structure does not have sufficient joint strength against the pulling force and the horizontal displacement force generated in the lower bearing wall and the upper bearing wall. .

The present invention has been made in view of the above circumstances, and provides a joint structure for a precast reinforced concrete structure having a simple structure and sufficient joint strength against pulling force and horizontal displacement force. Is intended.

[0005]

In order to solve the above-mentioned problems, the joint structure of a precast reinforced concrete structure according to the present invention has a hook-shaped joint bar protruding from the joint surface on one joint side and the other joint. Using precast plates having anchor bars connected to a box-shaped connector with at least the joint surface open on the part side, a floor slab is provided on the upper part of the lower precast plate of this one side, and it projects upward from this floor slab It is characterized in that the box-shaped connector of the other upper precast plate is inserted into the hook-shaped joint and the grout material is injected and joined.

[0006]

According to the present invention, a floor slab is provided on the upper side of one lower precast plate, and the box-shaped connector of the other upper precast plate is inserted into the hook-shaped joint bar projecting upward from this floor slab. Materials are injected and joined. In this way, since the lower precast plate and the upper precast plate are joined by the hook-shaped joining bar and the box-shaped joining tool, the pulling force and the horizontal displacement force generated between the lower precast plate and the upper precast plate. Also, it has a sufficient bonding strength.

[0007]

EXAMPLES Next, examples of the joint structure of the precast reinforced concrete structure of the present invention will be described. 1 is a schematic view of a precast reinforced concrete structure, FIG. 2 is a cross-sectional view of a precast plate, FIG. 3 is a cross-sectional view of a joint portion of an inner wall,
FIG. 4 is a perspective view showing a joining state of the hook-shaped joining bar and the box-like joining tool, FIG. 5 is a sectional view taken along line IV-IV of FIG. 4, and FIG. 6 is a sectional view of a joining portion of a side wall. .

Precast reinforced concrete structure 1
Has a floor slab 3 on the foundation 2, a precast plate 4 forming a bearing wall is joined to the floor slab 3, and a floor slab 3 is further provided on the precast plate 4 to form a plurality of floors. The foundation 2 is constructed by pouring concrete on site. Each floor slab 3 uses a synthetic slab composed of a precast floor board 30 and concrete 31 cast on the precast floor board 30. This floor slab 3 uses a synthetic slab,
RC slabs or precast slabs may be used.

The joint portion A of the inner wall of the precast reinforced concrete structure 1 is constructed as shown in FIGS. 2 to 5. The precast plate 4 that constitutes the load bearing wall has a hook-shaped joint bar 5 projecting from the joint surface 4b on the one joint portion 4a side, and a box shape that opens the joint surface 4d side on the other joint portion 4c side. It has an anchor muscle 7 to which the joint tool 6 is connected.

A floor slab 3 is provided on the upper side of the lower precast plate 4 on one side, and a box-shaped connecting tool 6 of the upper precast plate 4 on the other side is attached to a hook-shaped connecting bar 5 protruding upward from the floor slab 3. It is inserted and the grout material 8 is injected and joined.

On the upper side of the lower precast plate 4, auxiliary reinforcing bars 9 are arranged on both sides of the hook-shaped joint bar 5, and the auxiliary reinforcing bars 9 are bent in a U shape to serve as a bending moment resistance of the floor slab 3. The upper precast plate 4 is joined to the concrete 31 of the floor slab 3 via the mortar 10. The box-shaped connector 6 embedded in the upper precast plate 4 is formed by bending a press plate 6a having irregularities with the concave-convex surface 6b facing inward, and a pair of anchor bars 7 are welded to the box-shaped connector 6. It is installed. The box-shaped connector 6 has the concave-convex surface 6b on the inner side to increase the tensile resistance of the grout material 8.

Further, the box-shaped connector 6 is provided with a grout material injection pipe 11 on the lower side and a grout material discharge pipe 12 on the upper side. With the hook-shaped joint 5 of the lower precast plate 4 inserted in the box-shaped connector 6 of the upper precast plate 4, the grout material 8 is injected from the grout material injection pipe 11, and the grout material 8 is the grout material discharge pipe. The grout material 8 is injected and joined until it is discharged from 12.

In this way, the lower precast plate 4 and the upper precast plate 4 are joined by the hook-shaped connecting bar 5 and the box-shaped connecting tool 6, and the hook-shaped connecting bar 5 forms a rod-shaped reinforcing bar U.
Since it is formed by bending in a letter shape, it has sufficient bonding strength against the pulling force and the horizontal displacement force generated in the lower precast plate 4 and the upper precast plate 4.

When the upper precast plate 4 is joined to the lower precast plate 4, the upper precast plate 4
The hook-shaped connecting bar 5 can be used to hang it with a crane. By using the hook-shaped connecting bar 5, it is not necessary to provide a dedicated hanging member, and the structure is simplified.

The joint B of the outer wall of the precast reinforced concrete structure 1 is constructed as shown in FIG. The joint portion B of the outer wall is also configured in the same manner as the joint portion A of the inner wall shown in FIGS. 2 to 5, and therefore, the same reference numerals are given and detailed description thereof is omitted.

FIG. 7 shows another embodiment of the box-shaped connector. A pair of nuts 50 are welded to the inside of the box-shaped connector 6 embedded in the upper precast plate 4, and an anchor bar is attached to the nut 50. 7 is attached by screwing.

8 to 10 show another embodiment of the box-shaped connector, FIG. 8 is a perspective view of the box-shaped connector, and FIG. 9 is IX- of FIG.
Sectional drawing which follows the IX line, FIG. 10 is a top view of a box-shaped connector. The box-shaped connector 60 of this embodiment is formed by welding plates 61 to both sides of a pair of anchor bars 7. One side portion of the box-shaped connector 60 is closed by a connecting member 62, and the grout material injection pipe 1 is provided below the connecting member 62.
1 is provided, and the grout material discharge pipe 12 is provided on the upper side. The box-shaped connector 60 is simply formed by welding the plates 61 to both sides of the pair of anchor bars 7, and is joined to the hook-shaped connector bar 5 similarly to the box-shaped connector 6 shown in FIGS. 2 to 5. To be done.

[0018]

As described above, according to the present invention, the floor is provided on the upper side of one lower precast plate, and the hook-shaped joint bar projecting upward from this floor is joined to the box-shaped joint of the other upper precast plate. Since the tool is inserted and the grout material is injected to join, the simple structure has sufficient joining strength against the pulling force and horizontal rotating force generated between the lower precast plate and the upper precast plate. ing.

[Brief description of drawings]

FIG. 1 is a schematic view of a precast reinforced concrete structure.

FIG. 2 is a sectional view of a precast plate.

FIG. 3 is a cross-sectional view of a joint portion of an inner wall.

FIG. 4 is a perspective view showing a joined state of the hook-shaped joining bar and the box-like joining tool.

5 is a cross-sectional view taken along the line IV-IV in FIG.

FIG. 6 is a cross-sectional view of a joint portion of a side wall.

FIG. 7 is a cross-sectional view of a joint portion of an inner wall.

FIG. 8 is a perspective view of a box-shaped connector.

9 is a sectional view taken along line IX-IX in FIG.

FIG. 10 is a plan view of the box-shaped connector.

[Explanation of symbols]

 1 Precast reinforced concrete structure 3 Floor slab 4 Precast plate 4a, 4c Joining part 4b, 4d Joining surface 5 Hook-like joining bar 6 Box-like joining tool 7 Anchor bar 8 Grout material

Claims (1)

[Claims] 1. A precast plate having a hook-shaped joint bar protruding from a joint surface on one joint side, and an anchor bar connecting a box-like joint having an opening on at least the joint surface side on the other joint side. Using each other, a floor slab is provided on the upper side of this one lower precast plate, and the box-shaped joint of the other upper precast plate is inserted into the hook-shaped joint bar protruding upward from this floor slab to form the grout material. Joined structure of precast reinforced concrete structure characterized by being injected and joined.