JPH0790963A - Constructing method for wall structure made of concrete - Google Patents

Abstract

PURPOSE:To improve the efficiency of work by using PC members having multi-chamber sectional structure, in which an external wall and a partition wall are reinforced by horizontal reinforcing bars, as buried forms, bonding the buried forms in the horizontal direction and the vertical direction and forming an assembly. CONSTITUTION:Lap joint sections 6 are formed so that the horizontal reinforced- bar projecting sections 4 of external walls 2 on both sides of the buried forms 1 of a precast reinforced concrete member are overlapped mutually. Conversion forms 9 are installed so as to cover the lap joint sections 6, and vertical bars 8 and reinforcing bars 7 for smoothing the formation of the joint sections are arranged to the lap joint sections 6. The buried forms 1 are connected in the horizontal longitudinal direction and the vertical direction and an assembly is formed, and steel frames 5 as vertical reinforcing materials are disposed into the cavities of the inside of the assembly and the cavity is filled with concrete. Accordingly, the efficiency of form construction can be improved largely.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention not only reduces the work of formwork by using a precast reinforced concrete member having a multi-chamber cross-section structure as an embedded formwork, but also embeds the rebar used in the embedded formwork. The present invention relates to a method for constructing a concrete wall structure that functions as a horizontal reinforcing bar for a formwork and a concrete wall structure body.

[0002]

2. Description of the Related Art A buried reinforced concrete formwork has been conventionally used as one of construction members for concrete members, and is used at the bottom of a suspended floor slab or at the bottom of a building beam member or at the same time at the bottom and sides. There is an example.

Wall members are often used as building structural members, but no example of using an embedded formwork for the construction of the wall members is found.

[0004]

As concrete wall structures, there are civil construction wall structures as well as general construction wall structures, and a typical example thereof is a bridge pier. In the case of a road bridge, a wall structure having a width substantially equal to the width of the upper girder is often used as a pier from the viewpoint of supporting the upper girder having a width substantially equal to the width of the road as evenly as possible and economical design. .

For larger bridges, for the same reason, hollow piers with a hollow rectangular cross section having a width substantially equal to the width of the upper girder are adopted.

Structurally, this pier is the wall structure itself,
Alternatively, it is a combination of wall structures and is the same as the building wall structure, but is different from the building wall structure in the following points.

(1) The shape is large in size.

(2) As a design condition, not only the shearing force but also a large axial force is applied.

(3) The construction condition is outdoor construction.

For this reason, the following points have been demanded for the construction of the bridge piers, and eventually the civil engineering wall structure.

(1) Simplification of formwork construction as a measure for increasing the formwork area.

(2) Development of a rational horizontal reinforcement method for suppressing the buckling of the vertical reinforcement (reinforcing bar or steel frame) during a large earthquake.

(3) Development of a construction method that is not so sensitive to the weather.

In order to meet this demand, it is considered to use an embedded formwork. (1) When the embedded formwork for a beam member is diverted to a wall structure, the beam member and the wall structure are remarkably different in shape. It is impossible in fact. (2) It is possible to transfer the plate-like embedded formwork for a suspended floor slab to a wall structure, but since it is originally for a floor slab, it is necessary to use it on both sides for a wall structure. Not only is the effect of simplification of construction insufficient, but because this plate-shaped buried formwork does not have the function of suppressing the buckling of the vertical reinforcing material, it is meaningless to divert it to the conventional buried formwork. At present, the use of formwork cannot meet such a demand.

[0015]

DISCLOSURE OF THE INVENTION The present invention is not limited to such a conventional reinforced concrete buried formwork, but by using a reinforced concrete buried formwork having a novel structure, the rebar used in the buried formwork is improved. Not only acts as a reinforcing bar for the embedded formwork and the concrete wall structure body, but also suppresses buckling of the vertical reinforcement by the horizontal reinforcing bar used for the embedded formwork, especially the bulkhead, acting effectively. A method of constructing a concrete wall structure having a function is provided.

The present invention comprises a precast reinforced concrete member having a multi-chamber cross section structure, which is composed of outer walls on both sides and partition walls connecting the outer walls, and the outer walls and partition walls are reinforced by horizontal reinforcing bars. The frame is joined in the horizontal and vertical directions to form an assembly, the gaps in the horizontal and longitudinal joints of the assembly are covered from the outside, and the reinforcement is installed in the cavity inside the assembly in the vertical direction. A method for constructing a concrete wall structure, characterized in that a three-dimensional internal cavity is filled with concrete.

The first point of the present invention is that a precast reinforced concrete member having a unique structure is used as an embedded formwork. This precast reinforced concrete member is composed only of outer walls on both sides and bulkheads connecting them so that the horizontal cross section has multiple chambers. There is. A horizontal reinforcing bar is embedded in the partition wall so as to surround a cavity surrounded by the partition wall and the outer wall, or a horizontal reinforcing bar is embedded so that both ends are connected to the horizontal reinforcing bar of the outer wall and horizontally penetrates the partition wall. ing. It is not necessary to embed the vertical reinforcing bar on the outer wall and the partition wall, but it is appropriately used to smoothly arrange the horizontal reinforcing bar. In addition, it is preferable that the inner surface of the buried formwork is provided with a concavo-convex process in order to improve the integrity with the main body concrete. The shape of the room (cavity) having a horizontal cross section is usually rectangular, but a partition may be provided so as to form a triangle or a combination of a triangle and a hexagon. The partition wall does not need to be provided on the entire surface in the height direction of the embedded formwork, but rather, a cutout or hole is provided in part to improve the integration with the concrete body and use the cutout or hole. Therefore, it is preferable that the horizontal reinforcing bar for the wall structure body can be arranged.

The second essential point of the present invention is to form an assembly by connecting the above-mentioned buried molds in the horizontal and vertical directions.
In the gap of the horizontal longitudinal joint of the assembly, a normal diversion form is attached from the outside and closed to form a large composite form with the assembly and diversion form, and the cavity inside is reinforced vertically The point is to construct the concrete wall structure of the main body by filling the inner cavity of the assembly with the concrete of the main body with the materials installed. The horizontal longitudinal direction of the embedded formwork is to form a lap joint by the horizontal reinforcing bars protruding from both outer walls of the embedded formwork, and to arrange the reinforcements for the ordinary joints. Is attached from the outside and sealed, and then integrated by main body concrete to be placed later. The vertical connection of the embedded formwork may be performed by simply stacking it on top of the existing embedded formwork, but it is preferable to stack it while applying cement mortar to the upper surface of the existing installed formwork to strengthen the connection. . It is preferable from the viewpoint of stress dispersion that the joints in the horizontal longitudinal direction of the embedded molds of the respective stacked stages are staggered in a staggered manner. The embedded formwork used in the horizontal longitudinal middle part of the assembly has a shape in which the horizontal reinforcing bars project from both ends and the chambers at both ends are open, and the embedded formwork used at the horizontal longitudinal end of the assembly is The horizontal reinforcing bar projects only on the joint side, and only the room on the joint side is open. In the case of an annular assembly in the horizontal longitudinal direction, such as an assembly for constructing a hollow rectangular cross-section pier, all embedded forms are the abovementioned intermediate molds. Steel frames, steel pipes, box-shaped steel pipes, etc. are usually used as the vertical reinforcing material for the main body wall structure, and reinforcing bars are also used as necessary. In some cases, only the reinforcing bars are used. The assembly is
Usually, it is assembled by dropping the embedded formwork from above so as to surround the vertical reinforcements that have been placed in advance at predetermined positions, and combining them in both the horizontal and vertical directions. If necessary, horizontal reinforcement for the wall structure body during assembly. Place the muscles.

Since the present invention is constructed in this way, it has the following effects. (1) Since the precast reinforced concrete member can be used as an embedded formwork, the formwork construction can be made significantly efficient. (2) Not only the horizontal reinforcing bar used in the buried formwork functions as a reinforcing bar of the buried formwork and the concrete wall structure body, but also the horizontal reinforcing bar is used in the buried formwork, especially in the partition part. Therefore, it is possible to suppress the buckling of the vertical reinforcing material by surrounding the vertical reinforcing material in the entire horizontal reinforcing bar.

The construction method of the present invention is effectively used not only for construction of general construction wall structures but also construction of civil construction wall structures.
When used to construct a large-scale civil wall structure, such as a pier, the larger the wall structure, the greater the effect.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a precast reinforced concrete member used as a buried formwork in the present invention, (a)
Is a perspective view, (b) is a horizontal sectional view showing an example of horizontal reinforcing bar arrangement, (c) is a horizontal sectional view showing another example of horizontal reinforcing bar arrangement,
(D), (e) is a plane sectional view showing an example of the shape of a room having a horizontal section.

The buried formwork 1 is composed of outer walls 2 and 2 on both sides and a plurality of partition walls 3, 3 ... Connected between the outer walls 2, and both ends of the horizontal reinforcing bar 10 of the outer wall 2 extend in the horizontal longitudinal direction of the buried formwork 1. Four
As is protruding. The horizontal reinforcing bar 11 of the partition wall 3 is (b)
The both ends are bent in a hook shape as shown in FIG. 3 to be connected to the horizontal reinforcing bar 10 of the outer wall 2, or the partition wall 3 as shown in FIG.
Passing through the inner and outer walls 2, the vertical reinforcing bars 12, 12, ...
It is arranged in a ring so that it can be wrapped around.

The shape of the room of the horizontal cross section of the buried formwork 1 shown in (a) to (c) is a rectangle, but the shape of this room is a triangle or a triangle and six shapes as shown in (d) and (e). It may be a combination with a prism.

2A and 2B show the arrangement of the connecting portion and the vertical reinforcing member of the buried form used in the present invention, FIG. 2A is a perspective view, and FIG.
Is a plan sectional view.

A plurality of embedded molds 1 are installed in the horizontal longitudinal direction so that the projecting portions 4 of the horizontal reinforcing bars 10 of the outer walls 2 and 2 on both sides of the embedded formwork 1 overlap each other to form a lap joint, and overlap. The diversion form 9 is attached so as to cover the joint 6. In the lap joint portion 6, it is preferable to arrange vertical reinforcing bars 8 for facilitating the formation of the joint portion, and reinforcing bars 7 for reinforcing the joint portion, as shown in (b).

Steel frame 5 is used as the vertical reinforcing material,
In the case of (a), four steel frames 5 are arranged for each room, and in the case of (b), one steel frame 5 is arranged for each room.

From the standpoint of stress dispersion, it is preferable that the connecting portions in the horizontal longitudinal direction of the embedded formwork of each step to be stacked are arranged in a staggered manner by shifting the position for each step as shown in (a).

3A and 3B are plan sectional views of an assembly in which the buried formwork 1 used in the present invention is assembled. FIG. 3A is an assembly in which the horizontal section is linear, and FIG. 3B is a hollow rectangular shape in the horizontal section. It is an example of an assembly assembled in.

In the case of (a), it is usually composed of two types of embedded molds 1 of the intermediate type and the terminal type, and in the case of (b), the terminal type is not necessary but the embedded form 1 forming the straight part The embedded formwork 1 forming the bent portion is required.

[0031]

【The invention's effect】

(1) Since the precast reinforced concrete member can be used as an embedded formwork, the formwork construction can be made significantly efficient.
(2) Not only the horizontal reinforcing bar used in the buried formwork functions as a reinforcing bar of the buried formwork and the concrete wall structure body, but also the horizontal reinforcing bar is used in the buried formwork, especially in the partition part. Therefore, it is possible to suppress the buckling of the vertical reinforcing material by surrounding the vertical reinforcing material in the entire horizontal reinforcing bar.

[Brief description of drawings]

FIG. 1 shows an example of a precast reinforced concrete member used as a buried form in the present invention, (a) is a perspective view,
(B) is a horizontal sectional view showing an example of horizontal reinforcing bar arrangement. (C) is a horizontal sectional view showing another example of horizontal reinforcing bar arrangement. (D), (e)
FIG. 4 is a plan sectional view showing an example of the shape of a room having a horizontal section.

2A and 2B show an arrangement of a connecting portion and a vertical reinforcing member of an embedded form used in the present invention, FIG. 2A is a perspective view, and FIG. 2B is a plan sectional view.

3A and 3B are plan cross-sectional views of an assembly in which an embedded formwork used in the present invention is assembled, where FIG. 3A is an assembly in which a horizontal cross section is linear, and FIG. 3B is a horizontal rectangular cross section. It is an example of an assembly.

[Explanation of symbols]

1 ・ ・ Buried formwork, 2 ・ ・ Buried formwork outer wall, 3 ・ ・ Buried formwork bulkhead, 4 ・ ・ Outer wall horizontal reinforcing bar protrusion, 5 ・ ・ Steel frame, 6 ・
・ Lap joint part, 7 ・ ・ lap joint part reinforcement, 8 ・ ・ vertical rebar, 9 ・ ・ diversified form, 10 ・ ・ outer wall horizontal reinforcement, 11 ・
・ Partition horizontal reinforcement, 12 ・ ・ vertical rebar.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kikuo Ozeki 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. No. 7 Kashima Construction Co., Ltd.

Claims (1)

[Claims] 1. A precast reinforced concrete member having a multi-chamber cross-section structure, which is composed of outer walls on both sides and partition walls connecting the outer walls, and the outer walls and partition walls are reinforced by horizontal reinforcing bars. Inside of the assembly with the horizontal and vertical directions combined to form an assembly, the gap in the horizontal longitudinal joint of the assembly is covered from the outside, and the reinforcing material is installed vertically in the cavity inside the assembly. A method for constructing a concrete wall structure, characterized in that a cavity is filled with concrete.