JPH09273247A - Joining device of precast wall body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To join upper and lower precast wall bodies by a simple work without necessitating precision. SOLUTION: Hooks 12, 13 in the shape of U character are planted in a lower precast wall body 5 and an upper precast wall body 6 in advance, and a slab is placed on the lower precast wall body 5 at a lower story. Next, the upper precast wall body 6 at upper story is piled up through mortar layer 7 for flattening, and the hooks 12, 13 are positioned in a recessed hole 11 provided in the upper precast wall body 6 in advance in such a manner that they are overlapped in the horizontal direction. After that, a barlike member 16 passes through a guide pipe 15 inside both hooks 12, 13, and then mortar 17 is filled in the recessed hole 11 to fix a section between the hooks 12, 13 and the barlike member 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining device for joining a precast wall body made of reinforced concrete, which constitutes a boundary wall of a building, up and down.

[0002]

2. Description of the Related Art In recent years, in the construction of middle and high-rise apartment houses in which individual houses are arranged in parallel, precast wall bodies made of reinforced concrete are often used for the boundary walls because of their excellent construction efficiency. . Such a boundary wall is constructed by a method of stacking precast wall bodies while joining them with each other by a joining device, and the joining device has a structure capable of sufficiently withstanding stress generated during an earthquake, particularly tensile stress. There is a need.

Therefore, conventionally, as the above-mentioned joining device, two reinforcing bar bars are provided by arranging the reinforcing bar pre-planted in the upper and lower precast wall bodies in the notch groove provided in the upper precast wall body. Those that are connected by a plug-in joint or a mechanical joint have been used.

[0004]

However, according to the above-mentioned conventional joining device, since the reinforcing bar pre-planted in the upper and lower precast wall bodies must be positioned coaxially, the accuracy of the precast wall body itself is improved. In addition to high assembly accuracy, the manufacturing of the precast wall body and the construction of the entire building become troublesome, and the cost burden increases. Also, since it will be a connection work in the narrow notch groove provided in the upper precast wall,
There is also a problem that workability is poor and it takes a lot of time to join the precast wall body.

The present invention has been made in view of the above-mentioned conventional problems, and the problem is that the upper and lower precast wall bodies can be firmly joined with each other by a simple operation without requiring much precision. To do so.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a U-shaped or O-shaped hook in advance in each of upper and lower precast wall bodies made of reinforced concrete, and the above-mentioned upper and lower sides. The hooks are positioned so as to be laterally overlapped with each other in the recessed holes previously provided in the upper precast wall body, and the rod-shaped members inserted into the upper or lower precast wall bodies are attached to the insides of the upper and lower hooks. It is characterized in that the grout filling the recessed hole is solidified by inserting the grout between the hook and the rod-shaped member.

In the joining apparatus for precast wall bodies configured as described above, after stacking the upper and lower precast wall bodies, the rod-shaped members can be simply inserted through the insides of the upper and lower hooks located in the recessed holes.・ The connection of the lower hook is completed.
Moreover, the hook and the rod-shaped member are integrated with each other through the grout to withstand the tensile stress at the time of earthquake.

In the present invention, a plurality of joints including the recessed holes and the hooks may be provided in the longitudinal direction of the upper and lower precast wall bodies. In this case, the joints are provided in the longitudinal direction. It is desirable to use one or two extended bar members in common. The present invention also provides
Although the type of the grout is not limited, general-purpose mortar can be used.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 3 schematically shows a part of a building in which the front wall is a precast wall. In the figure, 1 is a boundary wall, 2 and 3 are wall-type columns that support both ends of the boundary wall 1, and 4 is a slab that serves as a floor of each floor. The boundary wall 1 is formed by stacking lower and upper precast wall bodies 5 and 6 made of reinforced concrete through the slab 4 and the leveling mortar layer 7, and the upper and lower precast wall bodies 6 and 5 are mutually connected. The spaces are joined at a plurality of locations in the longitudinal direction of the boundary wall 1 by a joining device 10 described later. The columns 2, 3 and the slab 4 are constructed by casting concrete in each layer here.

1 and 2 show a first embodiment of a joining device 10 for joining the above-mentioned upper and lower precast walls 6, 5. In FIGS. 1 and 2, 11
Is a recessed hole provided in the lower portion of the upper precast wall body 6 at a portion corresponding to each joint, and in the recessed hole 11, a U-shaped hook () formed in the upper portion of the lower precast wall body 5 ( A lower hook) 12 and a U-shaped hook (upper hook) 13 which is planted in the lower portion of the upper precast wall body 6 are arranged. The lower and upper hooks 12 and 13 are
The surfaces including the respective U-shapes are positioned so as to be orthogonal to the longitudinal direction of the boundary wall 1 and overlap each other in the longitudinal direction. As a result, inside the two hooks 12 and 13, one closed region 14 is formed, which is circular when viewed in the longitudinal direction of the boundary wall 1 (FIG. 2).

A guide pipe 15 is embedded in the lower portion of the upper precast wall body 6 so as to extend in the longitudinal direction of the boundary wall 1. The guide tube 15 is intermittently extended across the recessed hole 11, and one end or both ends of the guide tube 15 are open to the end surface of the upper precast wall body 6. A rod-shaped member 16 is inserted in the guide tube 15, and the rod-shaped member 16 is extended through the closed region 14 between the two hooks 12 and 13 at each joint. . Then, between the two hooks 12 and 13 and the rod-shaped member 16 in the recessed hole 11 at each joint, there is a solidified layer (not shown) formed by solidifying the mortar (grout) 17 filled in the recessed hole 11. It is integrated. The mortar 17 is adapted to be injected into the upper precast wall body 6 from one side wall surface thereof into the recess hole 11 and to be injected into the lower part of the recess hole 11 through an injection hole 18 provided in advance. Can be confirmed by a through hole 19 penetrating from the same wall surface to the upper side in the recessed hole 11. In addition, this through hole 19 is a recessed hole 11.
It is also used as a gas vent hole when the mortar 17 is filled with.

As an example of the size of the recessed hole 11, when the thickness T of the precast wall 6 is T = 180 mm, the height H = 80 to 120 mm, the width W = 80 to 120 mm, and the length L = 70. ~ 100m
It is set to about m. Also, as an example, the hook 1
2, 13 are D13U-shaped reinforcing bars,
A D25 type shear rebar is used as each. Further, as the mortar 17, for example, 1000 kgf /
A cm ² (98 MPa) grade is used.

In the first embodiment, a building is constructed in units of each layer and the layers are sequentially extended upward. After constructing the pillars 2 and 3 of the layer corresponding to the lower precast wall body 5 and the slab 4 thereon by casting in situ of concrete, the pillars 2 and 3 are arranged on the slab 4 so as to be aligned with the lower precast wall body 5. Build the precast wall 6. When building this, upper precast wall 6
The mortar for leveling is applied to the placement portion of the mortar in a predetermined thickness (about 10 mm), and the mortar layer 7 is used to form the upper precast wall 6
Adjust the level of. At this time, the hooks 12 planted in the lower precast wall body 5 are projected on the slab 4 and the mortar layer 7, and the hooks 12 are built at the same time as the upper precast wall body 6 is built. It goes into the recessed hole 11 of the wall body 6.

Hooks 13 preliminarily planted in the wall body 6 are arranged in the recessed holes 11 of the upper precast wall body 6, and the lower hooks 12 and the upper hooks 13 are constructed of the upper precast wall body 6. Simultaneously with the insertion, the recesses 11 are positioned so as to overlap each other in the longitudinal direction. That is, in each recessed hole 11, one closed region 14 is formed inside the lower and upper hooks 12 and 13. Next, the rod-shaped member 16 is inserted into the guide tube 15 previously embedded in the upper precast wall body 6 from its one end opening (mouth), and this is sequentially passed through the closed region 14 in each recessed hole 11, and subsequently, At both ends of the upper precast wall body 6, the guide tube 15 and the rod-shaped member 1 are provided.
The gap with 6 is closed with a filler such as cement. Alternatively, two rod-shaped members 16 may be prepared, and the rod-shaped members 16 may be individually inserted from the openings at both ends of the guide tube 15 so as to share an appropriate number of joints.

After that, the mortar 17 is injected into each recessed hole 11 through the injection hole 18 provided in the upper precast wall 6. The mortar 17 flows from the lower side to the upper side in the concave hole 11 and flows into the gap between the guide tube 15 and the rod-shaped member 16 to fill the inside of the concave hole 11 and the gap sequentially. Finally, the mortar 17 comes to flow out through the through-hole 19 that opens at the upper part of the recessed hole 11. At this stage, the injection of the mortar 17 is stopped and the solidification is waited for. As the mortar 17 solidifies, the two hooks 12, 13
The rod-shaped members 16 and the rod-shaped members 16 are integrated with each other through the solidified layer of the mortar 17, and can sufficiently withstand a large tensile stress. Further, even if the solidified layer of the mortar 17 breaks, the rod-shaped member 16 restricts the detachment of the lower and upper hooks 12 and 13, so that the upper and lower precast wall bodies 6 and 5 are not separated. In addition, particularly in the first embodiment, after stacking the upper precast wall body 6 on the lower precast wall body 5, by inserting one or two rod-shaped members 16 into the upper precast wall body 6, Since the connecting work of the upper and lower hooks 13 and 12 at the joining portion of is completed, workability is remarkably improved.

Incidentally, the wall type columns 2 and 3 and the slab 4
Is constructed after the above-mentioned joining of the upper and lower precast walls 6, 5 is completed. When constructing the wall-type columns 2 and 3, the reinforcing bars are extended upward from the existing columns 2 and 3 of the lower layer, and the reinforcing bars protruding from both ends of the upper precast wall body 6 are inserted into these reinforcing bar frames, after which, A mold is set and concrete is poured, whereby both ends of the upper precast wall body 6 are integrated with the wall columns 2 and 3.
In addition, the slab 4 is constructed by setting the form frame so as to surround the reinforcing bar frame and before and after placing the wall-type columns 2 and 3.

Here, in the first embodiment, one or two rod-shaped members 16 are used to connect the two hooks 12 and 13 in the longitudinal direction in the upper precast wall body 6. However, in the present invention, the two hooks 12 and 13 may be connected in the thickness direction of the upper precast wall body 6.

FIG. 4 shows a second embodiment in which such connection is made in the thickness direction. In the figure, the same components as those shown in FIGS.
The same reference numerals will be given. In the second embodiment,
Two U-shaped hooks 12A, 12B are planted in the lower precast wall 5 (not shown in FIG. 4), and these two U-shaped hooks 12A, 12B are arranged on both sides of the hook 13 planted in the upper precast wall 6. Try to position it. Further, a rod-shaped member 16 is individually prepared for the recessed hole 11 in each joint, and the rod-shaped member 16 is inserted into the guide pipes 15, 15 embedded in the upper precast wall body 6 in the thickness direction thereof, The lower hooks 12 </ b> A and 12 </ b> B and the upper hook 13 are passed through a closed region commonly formed inside.

With this structure, the concave hole 11
When the mortar is filled in and solidified, the lower hook 12A,
The 12B, the upper hook 13, and the rod-shaped member 16 are integrated with each other through a solidified layer of grout, and can withstand a large tensile stress as in the first embodiment. Further, in particular, by disposing one upper hook 13 between the two lower hooks 12A and 12B, the stress balance becomes good, and even if the solidified layer of grout breaks, the upper and lower precast wall bodies will be formed. Separation of 6, 5 is effectively prevented. In addition,
The hooks according to the second embodiment may be arranged such that the upper and lower arrangement relationships are reversed, that is, one hook is provided on the lower precast wall body 5 and two hooks are provided on the upper precast wall body 6.

In the above two embodiments, the hook 1
U-shaped ones are used as 2 (12A, 12B) and 13, but the shape of this hook can be arbitrarily changed within the range of U-shaped to O-shaped.

[0022]

As described above in detail, according to the joining device for precast wall bodies of the present invention, it is easy to pass the rod-shaped member inside the hooks planted in the upper and lower precast wall bodies. It is possible to join the upper and lower precast walls by work, and it is possible to improve construction efficiency and reduce construction cost. Further, since the upper and lower hooks and the rod-shaped member are integrated with each other through the grout, the upper and lower hooks can sufficiently withstand the tensile stress at the time of an earthquake, and the reliability of the earthquake-resistant structure is enhanced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention cut in a longitudinal direction of a precast wall body.

FIG. 2 is a cross-sectional view showing the first embodiment cut in the thickness direction of a precast wall body.

FIG. 3 is a schematic view showing a part of a building in which a boundary wall is composed of a precast wall body.

FIG. 4 is a sectional view showing a second embodiment of the present invention by cutting it in a thickness direction of a precast wall body.

[Explanation of symbols]

 1 Door-boundary wall 2,3 Wall type support 4 Slab 5 Lower precast wall 6 Upper precast wall 7 Leveling mortar layer 10 Joining device 11 Recessed hole 12, 12A, 12B Lower hook 13 Upper hook 15 Guide tube 16 Rod Material 17 Mortar

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location E04B 2/56 621 E04B 2/56 621R 633 633A 633G 1/16 1/16 L

Claims (3)

[Claims] 1. U-shaped or O-shaped hooks are preliminarily planted in each of the upper and lower precast wall bodies made of reinforced concrete, and the upper and lower hooks are provided in recessed holes provided in advance in the upper precast wall bodies. The rod-shaped members that are positioned so as to overlap each other in the lateral direction and that are inserted into the upper or lower precast wall body are inserted through the insides of the upper and lower hooks, and the recesses are formed between the hooks and the rod-shaped members. A precast wall joining device characterized in that the grout filled in the hole is solidified and integrated. 2. A plurality of joints including recessed holes and hooks are provided in the longitudinal direction of the upper and lower precast wall bodies, and one or two rod-shaped members extending in the longitudinal direction are common to these joints. The precast wall joining device according to claim 1, wherein the joining device is used. 3. The precast wall joining device according to claim 1, wherein the grout is mortar.