JP2545640B2 - Horizontal concrete construction method and formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a method for laterally placing concrete in a reinforced concrete structure (hereinafter referred to as RC structure), a steel frame reinforced concrete structure (hereinafter referred to as SRC structure), and a formwork. Is.

[Conventional technology]

When pouring concrete for the pillars of buildings, etc., it is usually poured from the top of the pillar formwork, but with the high strength and high quality of the concrete, it is becoming more difficult to construct concrete with a smaller slump value. Placement is required.

In addition, for concrete-filled steel pipe structures, methods of press-fitting concrete from the column bases at high pressure have also been studied (Yoshimi Shimura and Koichiro Keira: Study on the construction quality of concrete-filled steel pipe structures using full-scale models (Part 1)) , Architectural Institute Conference Summary, August 1986).

[Problems to be Solved by the Invention]

In the conventional method of pouring concrete from the upper part to the lower part of the formwork, it is often difficult to place concrete with a small water-cement ratio and a small slump value in RC structures and SCR structures.

When placing concrete with a small slump value, particularly problematic places are places where reinforcing bars and steel frames are intricate (joints, etc.), places far from the placing position (column lower layers, etc.), rebar and steel frames. There is a shadowed part (under the beam steel frame, etc.), and a place around the concrete from the beginning (under the opening).

For this reason, in conventional concrete pouring, it is often done to add more water than necessary, or to add chemicals, which reduces product strength, breathing, aggregate separation, etc. This is a cause of deterioration of concrete quality.

The present invention solves the above-mentioned problems relating to concrete pouring by devising that pouring of concrete is performed not from the upper portion of the mold but from the slide type injection port provided on the side surface of the mold, and high quality is achieved. It enables the pouring of concrete.

[Means for solving the problem]

According to a third aspect of the present invention, there is provided a horizontal formwork frame having a strip-shaped slide member which is slidable in the longitudinal direction of the formwork on a side surface of the formwork, and a concrete inlet is provided in the slide member. To do.

The invention according to claim 1 is a concrete horizontal construction method using the mold of claim 3, in which the concrete is sequentially pressed into the mold while moving the concrete inlet while the mold is installed. The feature is to go.

The invention according to claim 2 is a case where the side frame is a pillar formwork as the most general form in the construction method of the present invention, and a strip-shaped slide member that is vertically slidable is provided on the side surface of the pillar formwork. The slide member is provided with a concrete injection port, and the concrete is sequentially pressed into the column form while moving the injection port from the lower part to the upper part of the column form.

Concrete can be placed by press-fitting with a concrete pump, for example, when concrete is continuously press-fitted from the bottom to the top of a pillar formwork, a concrete with good quality and a low slump value with a low water-cement ratio. Can be set. In addition, there is no concern about aggregate separation, breathing, etc., which would occur when concrete with a high water-cement ratio is poured from the top of a pillar formwork. further,
Since the air in the form is pushed up by sequentially injecting concrete from the bottom, it is less likely that the sneaking of the concrete will be obstructed by the embedded steel frames and reinforcing bars.

As the strip-shaped slide member, a thin metal plate or the like having a smooth surface and easily peeled off from concrete is suitable. Also,
As long as it is thin and can be rolled up, the work can be carried out by unwinding and winding up and down the pillar formwork without requiring a special space. The shape and the like of the concrete inlet are not particularly limited, but in the case of pumping by pump, it is preferable that it can be directly connected to the concrete hose by a joint member or the like.

In addition, it is also possible to use a columnar frame in which a concrete inlet is provided on the above-mentioned strip-shaped slide member and move the concrete every time a fixed amount of the concrete is press-fitted to perform intermittent pouring.

Although the pillar portion has been mainly described above, the pillar portion can be applied to a place where the surroundings of the concrete are poor, such as a case under the opening, other than the pillar. That is, in the case of a horizontally long formwork, concrete can be press-fitted while moving a strip-shaped slide member provided with an injection port to the left and right on the side face of the formwork.

〔Example〕

1 and 2 show one embodiment of the present invention.

In this embodiment, a strip-shaped slide member 2 made of a thin metal plate is provided on one side surface of the pillar formwork 1, and this slide member 2 can be slid up and down with respect to the main body of the pillar formwork 1. This slide member 2 has a concrete inlet 3
Is provided, the concrete inlet 3 can be continuously moved from the lower part to the upper part of the pillar formwork 1 while unwinding and winding the slide member 2 at the lower part and the upper part of the pillar formwork 1.

A hose for placing concrete is connected to the concrete inlet 3 by a joint member such as a socket type, and concrete is press-fitted by a concrete pump. FIG. 2 shows how concrete 4 is press-fitted. Concrete 4 is sequentially press-fitted from the bottom into the column formwork 1 into which the column main bars 5, hoop bars 6 and the like have been inserted in advance. The slide member 2 is rolled up as the press-fitting of the concrete 4 progresses, and the concrete is press-fitted continuously from the side surface to the upper part of the pillar frame. The slide member 2
Regarding the sliding, for example, a vertical guide groove may be formed at a position in contact with the slide member 2 of the pillar frame 1, and both side ends of the slide member 2 may be slid along the guide groove.

The embodiment when applied to the pillar formwork has been described above,
It is possible to place concrete from the side in the same way except at the pillar position.

[Effects of the Invention] Particularly in the case of columns, since concrete inlets are provided on the side surfaces of the column formwork and the concrete is sequentially poured from the bottom to the top, it is possible to cast good quality concrete with a low water cement ratio and a low slump value. Can be set up.

By moving the concrete pouring position, good filling property can be obtained even in the place where there has been a problem of the concrete wraparound defect.

Concrete with a low water-cement ratio can be placed, and there is little concern about aggregate separation, breathing, etc., as in the case of conventional pouring or dropping.

By press-fitting concrete in order from the bottom, the air in the form is pushed up, and the embedded steel frames and reinforcing bars rarely obstruct the wraparound of concrete.

By providing a concrete inlet on the side surface of the mold and providing a strip-shaped slide member that can move in the vertical direction, it is possible to press-fit concrete while sliding the slide member.

Even for columns other than columns, by placing concrete from the side of the formwork, it is possible to use concrete with a low slump value and improve the wraparound of concrete.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, and FIG. 2 is a side sectional view thereof. 1 ... Column formwork, 2 ... Slide member, 3 ... Concrete inlet, 4 ... Concrete, 5 ... Main bar, 6 ... Hoop bar

Claims (3)

(57) [Claims] 1. A strip-shaped slide member that is slidable in the longitudinal direction of the mold is provided on the side surface of the mold, a concrete inlet is provided in the slide member, and while moving the inlet,
A horizontal concrete construction method characterized in that concrete is sequentially pressed into the formwork. 2. A strip-shaped slide member that is vertically slidable is provided on a side surface of a pillar formwork, a concrete inlet is provided in the slide member, and the inlet is moved from a lower part to an upper part of the pillar formwork. A horizontal concrete construction method characterized by sequentially injecting concrete into a column formwork. 3. A formwork for horizontal striking construction, characterized in that a strip-shaped slide member slidable in the longitudinal direction of the formwork is provided on the side surface of the formwork, and a concrete inlet is provided in the slide member.