JPH08144402A - Hollow precast concrete member for wall - Google Patents

Abstract

PURPOSE: To lighten the weight of a hollow PC member for a wall, and to reduce the cost of production, by improving the rigidity of PC wall panels using a part of a reinforcing bar to be arranged in a beam. CONSTITUTION: A pair of PC wall panels 12, 13 are confronted with each other at a predetermined interval and are joined to each other through trusses 14. Both side parts of an almost lower half part of a stirrup 18 in a reinforced concrete beam 16 to be positioned above when a hollow PC member 10 is erected, each are embedded in the top end parts of the PC wall panels 12, 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow precast concrete member for walls in which a pair of precast concrete wall slabs are connected to each other at a predetermined interval via a connecting member.

[0002]

2. Description of the Related Art Recently, in constructing a reinforced concrete wall, Japanese Patent Publication No. 61-34539 (Int.Cl.E04B 2/8
There is a method of using a hollow PC member for walls constituted by a precast concrete (hereinafter referred to as PC) wall slab as exemplified in 6). As shown in FIG. 7, the wall hollow PC member 1 includes a pair of PC wall slabs 1a and 1b arranged at a predetermined interval so as to form outer shells on both sides of the wall.
A connecting member such as a truss 2 is embedded between the facing surfaces of the PC wall slabs 1a and 1b so that the two members are coupled with each other with a predetermined gap.

The PC wall slabs 1a, which are connected to each other,
1b is built below the beam form 3a of the beam 3 to be constructed, and is arranged in the hollow portion 1c formed between both PC wall plates 1a and 1b, and the main beam 4 of the beam is formed in the beam form 3a. And after arranging the stirrup reinforcement 5, the PC wall slab 1 from the beam formwork 3a side
Concrete is placed in the hollow portion 1c between a and 1b.

[0004]

However, in such a conventional hollow PC member for wall 1, when the concrete is poured into the hollow portion 1c between the pair of PC wall slabs 1a and 1b, the concrete is It is sequentially accumulated from below the hollow portion 1c. Therefore, at the beginning of concrete pouring, PC
A large lateral pressure is applied to the lower ends of the wall slabs 1a and 1b by the weight of the concrete, and the PC wall slabs 1a and 1b are deformed by the lateral pressure so that the lower ends of the wall slabs are spread. At this time, although the truss 2 is interposed, a deforming force in the direction of narrowing acts on the upper end portions of the PC wall plates 1a and 1b.

Therefore, in order to overcome the deformation force and prevent the deformation of the PC wall plates 1a and 1b, these PC wall plates 1
It is necessary to increase the rigidity by increasing the thickness of a and 1b themselves and to increase the diameter of the truss 2. For this reason,
The wall-shaped hollow PC member 1 has a problem that the overall weight is significantly increased and the manufacturing cost is increased.

In view of such conventional problems, the present invention can reduce the weight and the manufacturing cost by improving the rigidity of the PC wall slab by utilizing a part of the reinforcement of the beam. It is an object to provide a hollow PC member for walls.

[0007]

In order to achieve the above object, the present invention provides a pair of Ps facing each other at a predetermined interval.
A C wall slab and a connecting member that is embedded across the PC wall slabs and that connects the facing PC wall slabs to each other;
A hollow PC member for a wall, in which the PC wall slab is built under a beam and concrete is placed in a hollow portion between both wall slabs, the upper side of the PC wall slab straddling the PC wall slab It is configured by embedding the lower end of the beam stirrup streak located in the.

In addition, it is desirable to pre-embed the beam lower end main bar located above the PC wall slab in the PC wall slab in advance.

Further, it is preferable that the upper part of the PC wall slab constitutes a form of a beam located above the PC wall slab.

[0010]

With the above construction, in the hollow wall PC member of the present invention, the beam star located above the PC wall slab straddles between a pair of PC wall slabs facing each other at a predetermined interval. Since the lower end of the lap bar is embedded in advance, the lower end of the star lap bar can support the deforming force in the direction in which the upper portions of the PC wall slabs are narrowed. At this time, since the stirrup muscle is used as a structural muscle,
The rigidity between the wall slabs can be significantly increased, which in turn
By improving the overall rigidity of the hollow wall PC member for wall, the wall thickness of the PC wall slab and the diameter of the connecting member for connecting the pair of PC wall slabs can be reduced, and the hollow PC member for wall can be lightened.

Further, by embedding the beam lower end main bar located above the PC wall slab in advance in the PC wall slab, in combination with burying the lower end portion of the stirrup bar, When the hollow PC member for construction is installed, the reinforcement work of the beam, that is, the reinforcement work of the beam bottom main bar and the beam stirrup bar can be omitted. Furthermore, at the upper end of the PC wall slab, this PC wall By configuring the beam formwork located on the upper side of the plate, the upper end of the PC wall slab can be used as the PC formwork of the beam, and the beam formwork installation and removal work can be omitted.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a hollow PC member for walls (hereinafter referred to as a hollow PC member) according to the present invention will be described in detail below with reference to the accompanying drawings. 1 to 6 show an embodiment of a hollow PC member 10 of the present invention, FIG. 1 is a sectional side view of the hollow PC member 10, FIG. 2 is an enlarged sectional view of a main part of a portion A in FIG. FIG. 4 is a side view of the hollow PC member 10 in a built-in state, FIG. 4 is a front view showing the reinforcement of the hollow PC member 10 at the upper and lower ends thereof, and FIG. 5 is a state in which the hollow PC member 10 is being built. Explanatory drawing, FIG. 6 is an explanatory view showing a completed state of the hollow PC member 10.

That is, the hollow PC member 10 of this embodiment is shown in FIG.
, A pair of PCs facing each other at a predetermined interval
The wall slabs 12 and 13 are provided, and these PC wall slabs 12 and 13 are connected to each other via a truss 14 as a connecting member.
The truss 14 is formed by bending one bar-shaped reinforcing bar into a wavy shape, and is used when the PC wall slabs 12 and 13 are molded.
The respective bent portions 14a and 14b of the
3 is embedded in the facing surface portion.

Here, in this embodiment, as shown in FIG. 2, between the upper ends of the PC wall slabs 12 and 13, the star of the reinforced concrete beam 16 located above when the hollow PC member 10 is installed is installed. Both side portions of the lower half portion of the lap muscle 18 are previously embedded. The stirrup streak 18 is arranged so as to surround the beam upper end main bar 20 and the beam lower end main bar 22, and has a rectangular shape that is elongated in the vertical direction as a whole. Further, the beam lower end main bars 22 are also embedded in the facing surface portions of the PC wall slabs 12 and 13 at the same time.

Further, the upper end portions 12a and 13a of the PC wall slabs 12 and 13 in which the stirrup bar 18 is embedded are used as a beam form of the reinforced concrete beam 16.

When the hollow PC member 10 is installed, the pair of adjuster bolts 2 projecting from the lower floor surface 24 already constructed as shown in FIG.
6 and 26a, the lower end surfaces of the PC wall slabs 12 and 13 are placed, and the upper end surfaces of the PC wall slabs 12 and 13 are provided with a space corresponding to the width of the reinforced concrete beam 16 to form a half PC.
The floor slab 28 is placed. At this time, as shown in FIG. 3, the hollow PC member 10 is supported via the supporting structure 30, and the leg portion protruding from the lower floor surface 24 is provided between the lower end portions of the PC wall plates 12 and 13. The muscle 32 is inserted.

In addition, in the installed state of the hollow PC member 10, the stirrup bar 1 is formed from the upper end of the hollow PC member 10.
8 is provided in a projecting manner, the beam upper end main bar 20 is arranged on the stirrup bar 18, and the upper bar 34 is projected between the upper end parts of the PC wall plates 12, 13 from an upper floor surface 38 described later. Is arranged.

In the hollow portion S formed between the PC wall slabs 12 and 13, wall reinforcements (not shown) are arranged as required, and then concrete is poured from above to reinforce the concrete wall 36. Is built. When the concrete is poured, a sealing material (not shown) is applied between the lower end portions of the PC wall slabs 12 and 13 and the lower floor surface 24, and the concrete flows out through the gaps formed by the adjuster bolts 26 and 26a. Is prevented. Further, when pouring concrete into the hollow portion S, the concrete is continuously poured into the half P
The upper floor surface 38 is also constructed by placing it on the upper side of the C floor slab 28.

By the way, the beam upper end main bar 20 and the beam lower end main bar 22 are set to a length equal to the width W of the hollow PC member 10 so as to be within the dimensions of the hollow PC member 10 as shown in FIG. However, the beam upper end main bar 20 and the beam lower end main bar 22 which are respectively adjacent to each other
Connected via The connecting reinforcing bars 40 are slidable with respect to the beam upper end main bar 20 and the beam lower end main bar 22, respectively, and are adjacent to each other as shown in FIG.
It is stored in one of the members 10. Then, as shown in FIG. 6, after the construction of the hollow PC member 10 is completed, the connecting rebar 40 is moved to the other side, and the beam upper end main bar 20 and the beam lower end main bar 2
A joint such as a lap joint is configured between the two. As shown in FIG. 4, in the hollow PC member 10a adjacent to the reinforced concrete column 42, the tip of the connecting rebar 40 is bent into an L-shape, and the L-shaped bent portion 40a.
Is an anchor portion in the reinforced concrete column 42.

In the hollow PC member 10 of this embodiment having the above-described structure, the pair of PC wall plates 12 and 13 face each other at a predetermined interval, and these PC wall plates 12 and 13 are connected to each other via the truss 14. The hollow P
By arranging the C member 10 under the beam and placing concrete in the hollow portion S, the reinforced concrete wall 36 can be easily constructed.

By the way, the hollow PC member 10 is built under the beam.
A hollow PC member 10 straddling between the upper ends of the wall plates 12 and 13.
Since the lower end portion of the stirrup bar 18 of the reinforced concrete beam 16 located on the upper side of the PC is pre-embedded, the stirrup bar 18 which is a structural bar allows the PC wall slabs 12, 13
It is possible to support the deformation force in the direction in which the upper parts of the two become narrower. Therefore, the rigidity between the upper portions of the PC wall slabs 12 and 13 is significantly increased, and it is possible to prevent the PC wall slabs 12 and 13 from being deformed even when concrete is placed in the hollow portion S. Therefore, the PC wall slab 1 has a simple structure in which the lower end of the stirrup streak 18 is buried.
2 and 13 can be made thin, and at the same time, the diameter of the truss 14 that connects both PC wall plates 12 and 13 can be reduced,
As a result, the weight of the hollow PC member 10 can be reduced.

Further, since the stirrup bar 18 is embedded and integrated with the hollow PC member 10, the stirrup bar 18 is completed at the same time when the hollow PC member 10 is built up. Simplification and speeding up of the 16 bar arrangement work are achieved. Further, in the present embodiment, when the stirrup bar 18 is buried, the beam lower end main bar 22 is buried in the upper ends of the PC wall slabs 12 and 13, so that the reinforcing work of the reinforced concrete beam 16 is further performed. It is possible to achieve simplification and speedup.

Further, in this embodiment, the stirrup muscle 1 is used.
8 and the PC wall slab 1 in which the beam bottom main bars 22 are embedded
Since the formwork of the reinforced concrete beam 16 is configured by the upper end portions 12a and 13a of the second and the third upper end portions 12a and 13a, respectively.
The a can be integrated with the concrete cast in the hollow portion S to form the reinforced concrete beam 16.
Therefore, the construction of the reinforced concrete beam 16 is performed at the same time when the hollow PC member 10 is built, and the work of removing the formwork is not necessary, and the construction work of the reinforced concrete beam 16 is remarkably performed. Simplified. The upper end portions 12a and 13a of the PC wall slabs 12 and 13 used as the beam form are continuously formed flat from the general portions 12b and 13b of the PC wall slabs 12 and 13. Without limitation, the upper end portions 12a and 13a may be projected outward from the general portions 12b and 13b so that the PC
It is also possible to form the wall slabs 12 and 13 by bending them.

[0024]

As described above, in the hollow precast concrete member for a wall according to claim 1 of the present invention, the hollow precast concrete member for a wall extends between a pair of precast concrete wall slabs facing each other at a predetermined interval. Since the lower end of the beam stirrup bar located on the upper side of the precast concrete wall slab was embedded in advance, this stirrup bar, which is a structural rebar, can significantly increase the rigidity between the precast concrete wall slabs, and, by extension, The overall rigidity of the hollow precast concrete member for walls can be improved. Therefore, it is possible to achieve a thinning of the precast concrete wall slab and a reduction in the diameter of the connecting member that joins the pair of precast concrete wall slabs, and in addition, it is possible to achieve the weight reduction of the hollow precast concrete wall member for walls, It is possible to reduce the manufacturing cost of the hollow precast concrete member for walls. By embedding the stirrup reinforcement in the precast concrete wall slab, the reinforcement of the stirrup reinforcement is completed at the same time as the construction of the hollow precast concrete member for the wall, so simplification and speedup of the reinforcement work of the beam. Can be achieved.

In the second aspect of the present invention, the precast concrete wall slab is pre-embedded with the beam lower end main bar located above the precast concrete wall slab, so that the hollow precast concrete member for wall is constructed. Since the reinforcement of the beam lower end main reinforcement is completed at the same time as the filling, the reinforcement work of the beam can be further simplified and speeded up.

Further, in the third aspect of the present invention, since the upper end portion of the precast concrete wall slab constitutes the form of the beam located above the precast concrete wall slab, the precast concrete wall Since the upper end of the slab can be used as a precast concrete formwork for the beam, it is possible to greatly simplify the beam construction work by omitting the beam formwork installation and removal work. Play.

[Brief description of drawings]

FIG. 1 is a sectional side view of a hollow precast concrete member for walls showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of an essential part showing a portion A in FIG.

FIG. 3 is a side view of the hollow precast concrete member for walls showing the embodiment of the present invention in a built-in state.

FIG. 4 is a front view showing the reinforcement of the upper and lower ends of the hollow precast concrete member for walls showing the embodiment of the present invention when the member is built.

FIG. 5 is an explanatory view showing a state in which a hollow precast concrete member for walls showing an embodiment of the present invention is being built.

FIG. 6 is an explanatory view showing a completed state of building a hollow precast concrete member for walls showing an embodiment of the present invention.

FIG. 7 is a sectional side view showing a part of a conventional hollow precast concrete member for walls.

[Explanation of symbols]

 10 Wall Hollow Precast Concrete Member 12,13 Precast Concrete Wall Slab 14 Truss (Connecting Member) 16 Reinforced Concrete Beam 18 Stirrup Reinforcement 22 Beam Lower End Reinforcement 36 Reinforced Concrete Wall

Claims (3)

[Claims] 1. A pair of precast concrete wall slabs facing each other at a predetermined interval, and a connecting member embedded between the precast concrete wall slabs and connecting the facing precast concrete wall slabs to each other. In the hollow precast concrete member for a wall, which is constructed by placing the precast concrete wall slab under the beam and placing concrete in the hollow portion between both wall slabs, straddling between the precast concrete wall slabs, A hollow precast concrete member for walls, characterized in that the lower end of a beam stirrup bar located above the precast concrete wall slab is buried in advance. 2. The precast concrete wall slab,
2. A beam bottom main bar located above the precast concrete wall slab is embedded in advance.
Hollow precast concrete member for walls according to. 3. An upper part of the precast concrete wall slab forms a form of a beam located above the precast concrete wall slab.
Hollow precast concrete member for walls according to.