JP2020148019A - Method of constructing reinforced concrete structure - Google Patents

Abstract

A method for constructing a reinforced concrete structure, in which a wall and a slab are joined, is capable of pouring concrete with ease and with stable quality. A wall formwork (5) is provided with a wall formwork opening (53) into which a concrete placing hose (7) for placing concrete can be inserted in the middle part in the height direction. is provided with a slab formwork opening 62 through which the concrete placing hose 7 can be inserted. The wall formwork 5 is inserted into the wall formwork 5 from the opening 53 , and the concrete discharge port 71 at the tip of the concrete placing hose 7 is arranged below the wall formwork opening 53 . a lower wall portion concrete placing step of placing concrete in a lower region 55 in the interior, a concrete placing hose removing step, and an upper wall portion concrete placing step. [Selection drawing] Fig. 1

Description

The present invention relates to a method of constructing a reinforced concrete structure.

In the construction method of the reinforced concrete structure, when the reinforced concrete wall part and the reinforced concrete slab are joined, the formwork of the wall part and the formwork of the slab on the upper floor are integrally provided, and the wall part. A construction method is known in which the concrete of the above and the concrete of the slab are cast at the same time (see, for example, Patent Document 1).

JP-A-2007-154556

However, at the joint portion between the wall portion and the slab, the reinforcing bars of the wall portion and the reinforcing bars of the slab are arranged, and the amount of reinforcing bars is large. For this reason, when an attempt is made to insert a hose for placing concrete from the joint between the wall and the slab in the formwork into the inside of the form of the wall, the hose interferes with the reinforcing bar at the joint between the wall and the slab. Therefore, it may not be possible to insert it to a predetermined height inside the formwork of the wall portion.
In such a case, concrete must be cast by dropping concrete from the joint between the wall and the slab into the formwork of the wall, which complicates the construction of the wall and also causes the wall. There is a risk of poor concrete placement.
In particular, when the floor height of the structure is high and the wall portion is high, the construction of the wall portion becomes complicated and there is a risk that the concrete placement of the wall portion may be defective.

Therefore, an object of the present invention is to provide a method for constructing a reinforced concrete structure in which a wall portion and a slab are joined so that concrete can be easily and stably placed in the reinforced concrete structure.

In order to achieve the above object, the construction method of the reinforced concrete structure according to the present invention is the construction method of the reinforced concrete structure in which the slab is joined to the upper part of the wall portion, in which the mold and the reinforcing bar of the wall portion and the slab A mold reinforcing bar installation process in which the mold and the reinforcing bar are integrally provided, a wall concrete placing step in which concrete is placed inside the wall mold, and concrete being placed inside the slab mold. A wall form opening in which a concrete placing hose for placing the concrete can be inserted into the form of the wall in the middle portion in the height direction. Is provided, and the slab mold is provided with a slab mold opening that penetrates in the height direction and allows the concrete placing hose to be inserted, and the wall concrete placing step is performed in the concrete placing. The hose is inserted through the slab mold opening, inserted into the inside of the wall mold through the mold opening, and the concrete discharge port at the tip of the concrete casting hose is inserted into the wall mold opening. Lower side wall concrete placing step of arranging concrete on the lower side and placing concrete in the area below the wall mold opening inside the wall mold, and lower side wall concrete. After the placing step, the concrete placing hose taking out the concrete placing hose from the wall mold and the slab mold, and closing the wall mold opening and the slab mold opening. The opening closing step and the upper side wall concrete placing step of placing concrete from the upper part of the wall mold in the area above the wall mold opening inside the wall mold. And, characterized by having.

In the present invention, the wall formwork is provided with a wall formwork opening, the slab formwork is provided with a slab formwork opening, and concrete in the lower portion of the wall is cast. In some cases, the concrete casting hose reaches the lower part of the wall formwork through the slab formwork opening and the wall formwork opening, so that it can easily reach the lower part of the wall formwork. Concrete can be cast.
In addition, compared to the case where concrete is dropped from the upper part of the wall formwork and placed on the lower part of the wall formwork, there is no risk of concrete placement failure, and the concrete is of stable quality. can do.

Further, in the construction method of the reinforced concrete structure according to the present invention, in the lower side wall concrete placing step, the concrete is divided into a plurality of parts in the height direction and the concrete is placed, and each time the concrete is placed, the concrete is placed. The concrete may be agitated or the concrete may be vibrated.
With such a configuration, the concrete on the wall can be made more stable and of good quality.

According to the present invention, concrete can be easily and stably placed in a reinforced concrete structure in which a wall portion and a slab are joined.

It is a perspective view explaining the formwork reinforcing bar installation process, the lower side wall concrete placing process of the construction method of the reinforced concrete structure by embodiment of this invention. It is a perspective view explaining the opening closing process, the upper side wall concrete placing process, and the slab concrete placing process of the construction method of the reinforced concrete structure by embodiment of this invention.

Hereinafter, a method of constructing a reinforced concrete structure according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIGS. 1 and 2, in the construction method of the reinforced concrete structure 1 according to the present embodiment, the concrete 21 of the reinforced concrete wall portion 2 and the concrete 31 of the reinforced concrete slab 3 joined to the upper portion thereof are continuously connected. And cast.
The wall portion 2 and the slab 3 are made of a known reinforced concrete structure, and the joint portion 4 between the wall portion 2 and the slab 3 is arranged so that both the reinforcing bar 22 of the wall portion 2 and the reinforcing bar 32 of the slab 3 overlap. There is.
The slab 3 is joined to one surface side of the upper portion of the wall portion 2.

First, the formwork 5 (wall formwork 5) of the wall portion 2 and the formwork 6 (slab formwork 6) of the slab 3 will be described.
The wall formwork 5 includes a first wall formwork 51 arranged along one surface of the wall 2 and a second wall formwork plate arranged along the other surface of the wall 2. It has 52 and.
Both the first wall formwork plate 51 and the second wall formwork plate 52 are set to have the same height dimension as the height dimension of the wall portion 2.
The first wall formwork plate 51 is formed with a wall formwork opening 53 that penetrates the plate surface at an intermediate portion in the height direction. The wall formwork opening 53 is set to a size capable of inserting a concrete placing hose 7 (see FIG. 1) for placing concrete. Inside the wall formwork 5, the concrete casting hose 7 can be inserted through the wall formwork opening 53.
For example, when the floor height of the reinforced concrete structure 1 is 4200 mm, the wall formwork opening 53 is formed at a height of 1500 mm from the lower end of the first wall formwork plate 51.
As shown in FIG. 2, the wall formwork opening 53 is configured so that it can be closed by attaching the wall formwork opening closing plate 54.
As shown in FIG. 1, in the reinforcing bars 22 of the wall formwork 5 and the wall portion 2, the concrete casting hose 7 inserted from the wall formwork opening 53 passes between the reinforcing bars 22 and the wall formwork 5 It is arranged so that it can reach the lower side of the interior of the.

As shown in FIGS. 1 and 2, the slab formwork 6 has a slab formwork plate 61 arranged along the lower surface of the slab 3. In the present embodiment, the slab 3 and the beam 8 are integrally provided, and the slab formwork 6 also includes the formwork of the beam 8.
Reinforcing bars 32 of the slab 3 are arranged on the slab formwork plate 61. The slab formwork plate 61 is formed with a slab formwork opening 62 that penetrates the plate surface at a position separated from the wall formwork 5. The slab formwork opening 62 is configured to allow a concrete casting hose 7 (see FIG. 1) to be inserted.
As shown in FIG. 2, the slab form opening 62 is configured to be closed by attaching the slab form opening closing plate 63.
As shown in FIG. 1, the reinforcing bars 32 of the slab formwork 6 and the slab 3 are arranged so that the concrete placing hose 7 can pass between the reinforcing bars 32 and penetrate the slab formwork opening 62. ..

Next, the construction method of the reinforced concrete structure 1 will be described.
In the following, the end of the concrete placing hose 7 on the side where the concrete 21 and 31 flow out is referred to as a concrete discharge port 71.
First, a formwork reinforcing bar installation step of installing the wall formwork 5, the reinforcing bar 22 of the wall portion 2, the slab formwork 6, and the reinforcing bar 32 of the slab 3 is performed.
As shown in FIG. 1, the wall formwork 5 and the slab formwork 6 are integrally provided, and both the reinforcing bar 22 of the wall portion 2 and the reinforcing bar 32 of the slab 3 are provided at the joint portion 4 of the wall portion 2 and the slab 3. Reinforce.
It is assumed that the wall formwork opening 53 and the slab formwork opening 62 of the wall formwork 5 are opened.

Subsequently, the wall concrete placing step of placing the concrete 21 of the wall portion 2 is performed.
In the wall concrete placing step, the lower side wall concrete placing step of placing the concrete 211 of the lower portion of the wall 2 and the concrete taking out the concrete placing hose 7 from the wall formwork 5 and the slab formwork 6 A step of taking out the casting hose, a step of closing the opening that closes the wall formwork opening 53 and the slab formwork opening 62, and a step of placing concrete on the upper side wall for placing concrete 212 on the upper side of the wall 2. And do.

In the lower side wall concrete placing step, the concrete placing hose 7 is inserted through the slab formwork opening 62 and inserted into the wall formwork 5 through the wall formwork opening 53. At this time, the concrete discharge port 71 of the concrete placing hose 7 is arranged near the lower end portion inside the wall formwork 5 (for example, at a height position of 300 mm from the upper surface of the slab 11 on the lower floor).
Concrete 211 is discharged from the concrete discharge port 71 of the concrete placing hose 7 to a region 55 (hereinafter referred to as a lower region 55) below the wall formwork opening 53 inside the wall formwork 5. Place concrete 211.

At this time, the concrete 211 is not placed all at once in the entire lower region 55 inside the wall formwork 5, but the concrete 211 is placed at a predetermined height and the concrete 211 of a predetermined height is placed. It is preferable to apply stirring and vibration to prevent the concrete 211 from junking each time. For example, the cast concrete 211 is tapped, and the cast concrete 211 is pierced with a bamboo stick to prevent junker.

In the concrete placing hose taking-out step, the concrete placing hose 7 is taken out from the wall formwork opening 53 and upwardly taken out from the slab formwork opening 62.

Subsequently, as shown in FIG. 2, in the opening closing step, the wall formwork opening 53 is closed by the wall formwork opening closing plate 54, and the slab formwork opening 62 is closed by the slab formwork opening. It is closed by the closing plate 63. The wall formwork opening closing plate 54 that closes the wall formwork opening 53 becomes a part of the wall formwork 5, and the slab formwork opening closing plate 63 that closes the slab formwork opening 62 is a slab type. It becomes a part of the frame 6.

In the step of placing concrete on the upper side wall, concrete 212 is placed in a region (hereinafter, referred to as an upper region 56) above the wall formwork opening 53 of the wall formwork 5. The concrete casting hose 7 is inserted into the wall formwork 5 from above. Since the upper part of the wall formwork 5 is a joint portion 4 with the slab 3, both the reinforcing bar 22 of the wall portion 2 and the reinforcing bar 32 of the slab 3 are arranged. The concrete casting hose 7 is inserted from a portion that does not interfere with the reinforcing bar 22 of the wall portion 2 and the reinforcing bar 32 of the slab 3 to a possible depth inside the wall formwork 5.
In the casting of the concrete 212 in the upper region 56, the concrete 212 is not cast all at once in the entire upper region 56 inside the wall formwork 5, and the junker is prevented every time the concrete 212 is cast for a predetermined height. It is preferable to stir and apply vibration.

Subsequently, a slab concrete placing step of placing concrete 31 into the slab formwork 6 is performed.
The concrete discharge port 71 of the concrete placing hose 7 is arranged above the slab formwork 6, and the concrete 31 is placed in the slab formwork 6.
After curing for a predetermined period, the concrete 31 of the wall portion 2 and the slab 3 is hardened, and after the concretes 21 and 31 are hardened, the mold is removed.

Next, the action and effect of the construction method of the reinforced concrete structure 1 according to the above-described embodiment will be described with reference to the drawings.
In the construction method of the reinforced concrete structure 1 according to the present embodiment described above, the wall formwork 5 is provided with the wall formwork opening 53, and the slab formwork 6 is provided with the slab formwork opening 62. When the concrete 211 of the lower portion of the wall portion 2 is cast, the concrete casting hose 7 passes through the slab formwork opening 62 and the wall formwork opening 53 to the lower side of the wall formwork 5. Since it reaches the portion, the concrete 211 can be easily placed on the lower portion of the wall formwork 5.
Further, as compared with the case where concrete is dropped from the upper part of the wall formwork 5 and placed on the lower portion of the wall formwork 5, there is no possibility that the concrete 211 is poorly placed and the concrete of the wall part 2 is placed. 21 can be a stable quality.

Further, in the lower side wall concrete placing step, the concrete 21 is placed by dividing it into two in the height direction, and each time the concrete 21 is placed, the concrete 21 is agitated and the concrete 21 is vibrated. As a result, the concrete 21 of the wall portion 2 can be made more stable and of good quality.

Although the embodiment of the construction method of the reinforced concrete structure 1 according to the present invention has been described above, the present invention is not limited to the above embodiment and can be appropriately changed without departing from the spirit of the present invention.
For example, in the above embodiment, the slab 3 is joined only to one surface side of the wall portion 2, but may be joined to both sides.
Further, a plurality of wall formwork openings 53 may be provided at intervals in the height direction and the horizontal direction. When a plurality of wall formwork openings 53 are provided in the height direction, the concrete placing hose 7 is inserted in order from the lower wall formwork opening 53 and the concrete 21 is placed from the lower side. Then, the wall formwork opening 53 may be closed when the cast concrete 21 reaches the wall formwork opening 53.

1 Reinforced concrete structure 2 Wall part 3 Slab 4 Joint part 5 Wall formwork (wall formwork)
6 Slab formwork (slab formwork)
7 Concrete casting hose 21 Concrete 22 Reinforcing bar 31 Concrete 32 Reinforcing bar 53 Wall formwork opening 55 Lower area 62 Slab formwork opening

Claims (2)

In the construction method of a reinforced concrete structure in which a slab is joined to the upper part of the wall
A formwork reinforcing bar installation step in which the formwork and reinforcing bars of the wall portion and the formwork and reinforcing bars of the slab are integrally provided.
The wall concrete placing process of placing concrete inside the wall formwork,
It has a slab concrete placing process of placing concrete inside the slab formwork.
The wall formwork is provided with a wall formwork opening into which a concrete placing hose for placing the concrete can be inserted in the middle portion in the height direction.
The slab formwork is provided with a slab formwork opening that penetrates in the height direction and allows the concrete casting hose to be inserted.
The wall concrete placing process is
The concrete casting hose is inserted through the slab formwork opening, inserted into the inside of the wall formwork through the wall formwork opening, and the concrete discharge port at the tip of the concrete casting hose is inserted. Lower side wall concrete placing step of arranging concrete below the wall formwork opening and placing concrete in the area below the wall formwork opening inside the wall formwork. When,
After the lower side wall concrete placing step, the concrete placing hose taking out step of taking out the concrete placing hose from the formwork of the wall part and the formwork of the slab, and
An opening closing step of closing the wall formwork opening and the slab formwork opening,
It is characterized by having an upper side wall concrete placing step of placing concrete from the upper part of the wall formwork in a region above the wall formwork opening inside the formwork of the wall part. Construction method of reinforced concrete structure. The lower side wall concrete placing step is characterized in that the concrete is placed in a plurality of parts in the height direction, and each time the concrete is placed, the concrete is agitated or vibration is applied to the concrete. The method for constructing a reinforced concrete structure according to claim 1.

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