JPH01295954A - Execution of cast-in-place concrete - Google Patents

Abstract

PURPOSE:To prevent the generation of hollows in the lower part of built-in materials by placing every two rows of built-in materials and placing while confirming the binding of concrete in the next row when concrete is placed to the lower part of concrete built-in materials. CONSTITUTION:A plurality of concrete built-in materials (A) are supported in a state of floating, and they are supported and held in a state of a plurality of rows at a specific interval. Concrete is successively placed at least every next two rows at an interval of one row, and concrete layers (C) formed of the placed concrete are bound at the next row around the lower side of the row each other. Accordingly, the concrete can be placed while confirming with the eye that there is no hollow caused by the binding fault on the concrete layers (C).

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a concrete on-site pouring construction method, and more specifically, to a concrete useful for on-site construction of a concrete slab in which embedded materials are embedded by pouring concrete on-site. Concerning on-site pouring construction method.

<Conventional technology> In recent years, hollow concrete slabs have been widely adopted for medium-to-high-rise buildings such as apartment complexes, general buildings, and warehouses in order to reduce the weight of the slabs, make them soundproof, and eliminate small beams. There is. A known construction method for such concrete slabs is to use factory-produced PC boards as the lower concrete layer, combine this with lightweight solid material to serve as the embedding material, and use concrete cast on site as the upper concrete layer. ing. In this method,
While this has the advantage of saving the labor of pouring the sublayer concrete on-site, it also requires transporting heavy PC boards to the construction site, and unloading at the site using a crane, etc., resulting in a large amount of work. In addition to requiring time and financial burden,
The CC release itself was also complicated to produce.

Therefore, in order to eliminate these drawbacks of the conventional technology, multiple rows of the above-mentioned embedded materials were supported and held so as to float above the concrete pouring formwork via holders, and the necessary reinforcement was arranged. A method of constructing a concrete slab has been proposed in which concrete is poured after the concrete is poured and embedded materials are buried (see Japanese Patent Laid-Open No. 58-218554).

<Problem to be solved by the invention> However, in the construction method disclosed in the above publication, the entire pouring surface (floor surface) is divided into multiple sections, and the concrete surface of the divided sections is set to be approximately horizontal. As concrete is poured into relatively large sections at once, much attention is paid to the curing of the concrete surface when pouring concrete. It is not possible to confirm poor bonding between layers. These poor connections are said to occur due to an insufficient amount of concrete being poured, a decrease in concrete pouring pressure, etc.
This creates a large cavity within the concrete layer. This results in many rough areas within the concrete slab, which poses a problem in terms of strength.

This invention was made in view of the above-mentioned problems, and it can be done without hindrance to leveling of poured concrete.
The purpose of the present invention is to provide a concrete on-site pouring construction method that can reliably prevent the occurrence of cavities, etc., which are a cause of a decrease in the strength of concrete slabs.

Means for Solving the Problems> To achieve the above object, the concrete on-site pouring method of the present invention involves supporting a plurality of concrete embedded materials in a floating state and placing them in multiple rows at predetermined intervals. In the concrete on-site pouring construction method, in which the support is maintained and the necessary reinforcement is placed, concrete is poured and the above-mentioned concrete embedding material is buried, and concrete is poured every two rows after at least one row. , the concrete layers formed by pouring concrete are joined between the next row around the bottom of the row.

According to the concrete on-site pouring construction method with the above configuration, concrete is poured every two rows after at least one row, and the concrete layers formed by the poured concrete are placed under each row. Since the concrete is joined between the next rows around the side, concrete can be placed while easily visually confirming that no cavities have occurred due to poor jointing between concrete layers. Therefore, in this case, it is possible to reliably prevent the formation of a cavity or the like that may occur in the lower part of the embedding material. Furthermore, leveling of the concrete can be easily carried out by making the upper concrete layer in which the embedding material is buried as a subsequent process.

<Example> Next, an example according to the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing the implementation process of a concrete on-site pouring method according to an embodiment of the present invention. For convenience of explanation, we will first explain the basic structure of a concrete slab and its construction to which the above-mentioned concrete on-site pouring method is applied.
This will be explained with reference to FIGS.

In FIG. 2, the support structure (1) includes an embedded material (A) supported and held by the support structure (1) within a concrete layer (J) (C2) to (C4) cast on site;
It is designed to be buried together with the necessary reinforcement (2), (3), (4), and (5). As the support structure (1), in order to ensure sufficient concrete cover under the embedded material (A), the embedded material (A) is placed in a formwork for concrete pouring (B) (hereinafter referred to as formwork). It is configured to be held floating at a predetermined height from above.

More specifically, the support structure (1) is a plurality of supporting forces located at mutually opposing side positions of the embedded material (A), along the direction in which the embedded material (A) is arranged and at appropriate intervals. (
11).

As can be seen from Fig. 3, the bearing force (II) consists of a relatively long plate-like body, and its upper and lower ends have a surface opposite to the side of the embedded material (A). The lower bent piece (llb) and the upper bent piece (lb) are bent at right angles to the opposite side.
la) is formed. In the lower bent piece (llb),
Pass the bolt (12) through and tighten using the home tie (
15) for tightening the bearing force (11) and fixing it on the formwork (B).
d) is formed.

Note that it is preferable that a screw hole (lie) is also formed in the upper bent piece (lla). This is done by screwing a bolt (16) into a screw hole (lie), attaching a bar-shaped member (15') such as a home tie, standing on the bearing force (11), and placing the bar-shaped member (15') on the support force (11). By marking the predetermined height position with tape, etc., this rod-shaped member (15') can be used for leveling when pouring concrete, and after leveling, it can be removed together with the bolt (16). This is because it is convenient for the next process, such as being able to do the following (see Figure 2).

Next, as shown in FIG. 3, an upper bent piece (Ll
A receiving part consisting of an L-shaped piece (
ie) is attached. The mounting position of the receiving part (Lie) is, for example, the upper through angle (2
]) through the bottom of the embedding material (A) with the angle (
20), a suitable position is where the upper part of the embedded material (A) and the upper bent piece (lta) are substantially flush with each other when supported at the receiving part (lie). According to this, when the presser bar (17), which will be described later, is passed across the width direction of the embedding material (A) and attached to the upper bent piece (lla), at the same time, the embedding material (A) is attached to the upper bent piece (lla).
The upper through angle (21) that rests on the lower through angle (20) can be fixed, and the embedded material (A) supported on the lower through angle (20) can be held down by the holding bar (17) and the receiving part (l).
ie).

As described above, each receiving part (lie) of the plurality of bearing forces (11) attached to the formwork (B) is provided with a plurality of A pair of opposing lower through angles (2) extending along the embedding (A).
0) (20) is supported (see Figures 4 and 5). The length of the lower through angle (20) is cut according to the connection length of the embedded material (A'), and the length of the receiving part (l
When installed in ie), they are connected so as to extend along and abut a plurality of embedded materials (A). It is preferable that the connection (e) between the lower through angles (20) be performed at a predetermined receiving part (llc) (fifth
(see figure). Connection between lower through angles (20) (e)
Although welding or other joining means are used for this, a known adhesive tape (18) is used here for connection.

In addition, the embedded material (A) supported as described above and held at a predetermined height from the formwork (B) has a plurality of embedded materials (A) attached to the upper corner of the side part. A pair of opposing upper through angles (21) (21) are applied (see FIGS. 6 and 7). In addition, the length of the upper through angle (21) is also cut according to the connection length of the embedded material (A) in the same manner as the lower through angle (20), and the length of the upper through angle (21) is cut according to the connection length of the embedded material (A). During installation, it is provided so as to extend along and come into contact with the plurality of embedded materials (A). However, as can be seen from Figures 7 and 8, the upper passage 1 and the angle (21) are connected using the embedded material (A).
It is necessary to avoid the joints <r> between the embedding materials (A) in order to sufficiently suppress individual lifting and displacement of the embedding materials (A).

Again, to connect the upper through angles (21),
A known adhesive tape (14) is used.

Next, the upper bent pieces (lla) (
lla) is attached with a presser bar (17) extending in the width direction of the embedded material (A) supported and held as described above (see FIGS. 7 and 8). Presser bar (1
7), when fixed to the above-mentioned rain bending piece (lla) (lla), prevents the bearing force (11) generated during concrete pouring from spreading in the lateral direction, and also prevents the embedded material (A) from spreading in the lateral direction. It suppresses the rise of the
The embedded material (^) that cooperates with the upper through angle (21) and the receiving part (lie) and abuts the lower through angle (20)
It is intended to hold the following. As shown in FIG. 7, a communicating hole (17a) is bored at a position corresponding to the screw hole (lie) of the upper bent piece (11a) of the presser bar (17), and the presser bar (17) is an upper bent piece (11a) by a binding wire passed through a hole (17a) and a screw hole (lie).
) is fixed. Note that the hole (17a) may also be provided with a female thread, and the presser bar (17) may be fixed with an appropriate bolt.

By the way, the above-mentioned embedding material (A) is a lightweight solid material having rectangular sides, for example, a foam molded product made entirely of synthetic resin, preferably having closed cells, a plate material, a cardboard, etc. It does not matter whether it is in the shape of a hollow container or a solid block. In addition, the embedded material (A) used here is a stack of multiple void forms (hollow embedded materials) that are fitted together and stacked according to the thickness of the slab, but in some cases, a one-piece Void formwork may be adopted. In addition, in the case of the fitting/stacking type embedding material (A), it is preferable to temporarily attach it with a known adhesive tape or the like so that the fitting does not come off due to the concrete placement pressure applied from the lateral direction.

When the embedding material (A) is a foamed molded article made of synthetic resin, materials manufactured from polyethylene, polypropylene, polyvinyl chloride, copolymers mainly composed of these, etc. are selected in addition to polystyrene foam. In addition, the first
In the figure, the code (13>) indicates a steel joist.

Next, a method of constructing a concrete slab in which to bury the support structure having the above structure will be explained.

However, in the explanation of the installation of the support structure shown in FIGS. 4 to 8, one of the reinforcements (2) will be omitted for simplification.

First, in Fig. 4, the necessary reinforcements (4) and (5) are arranged in a predetermined shape on the appropriately laid formwork (B), and the embedded material (A) is A plurality of embeddings (A) at mutually opposite side positions of the material (A)
) A plurality of supporting legs (11) are arranged at appropriate intervals along the direction in which the supporting legs (11) are arranged. A plurality of rows of embedded materials (A) are provided at predetermined intervals in the lateral direction.

Next, as shown in FIGS. 4 and 5, the embedding material (A
A plurality of embedded materials (
A plurality of embedded materials (A) that are in contact with the lower side corner of A)
a pair of opposing lower through angles (20) extending along the
(20) are arranged in sequence. The lower through angles (20) are connected (e) at appropriate receiving portions (Lie).

As can be seen from FIG.
) and are spaced apart by approximately the width of the embedded material (A).
20), place the embedded materials (A) one by one in a row so that their lower end corners are supported (see Figure 6).
.

After this, the embedded material (A) is supported and held at a predetermined height from the formwork (B), and a plurality of embedded materials are placed at the upper end corners of each of the embedded materials (A) arranged in a row, as shown in FIGS. 6 and 7. A pair of opposing upper through angles (21) (21) extending along the material (A) are installed. At this time, multiple embedded materials (
In A), the upper passage angle (21) can be placed along the -degree angle. As can be seen from Figures 7 and 8, the upper through angles (21) are connected to the embedded material (A).
Avoiding the seams (f') between the two, use a known adhesive tape (1
4).

Next, as shown in FIGS. 7 and 8, the embedding material (A)
A presser bar (17) extending in the width direction of the embedded material (A) is attached to the upper bent pieces (lla) (lla) of the supporting legs (11) (11) facing each other with the embedding material (A) in between. This attachment is carried out by passing a binding wire through the hole (17a) and the screw hole (lie) and binding. By fixing the presser bar (17) to the upper bent piece (11a) (lla), it is possible to prevent the support leg (11) from spreading laterally during concrete pouring, and also to prevent the support leg (11) from expanding in the lateral direction during concrete pouring. 21) and the receiving part (Lie) to hold the embedded material (A) in contact with the lower through angle (20),
This rise can be suppressed. Also, via the upper passage angle (21), a plurality of implants (A) can be fixed at - in cooperation with the receiver (llc) and the lower passage angle (20). As a result of the above, supporting and holding of the plurality of embedded materials (A) by the support structure (1) in FIG. 2 can be completed.

Then, as shown in Figure 2, the embedded material (A) is supported and held by the support structure (1), and the necessary reinforcement (3) and piping are installed, and then concrete is poured on-site. can be buried in the concrete layers (C1), (C2) to (C4) as one piece to construct the desired concrete slab.

In Figure 1, when constructing the concrete slab, embedded materials (A) are supported and held in rows while floating on the formwork (B), and multiple rows (Al) are placed at predetermined intervals in the lateral direction.
(A2) (A3)...Indicates a concrete on-site pouring construction method suitable for burying the provided support structure etc. in one piece.

First, as a characteristic component of this concrete on-site pouring construction method, as shown in Figure 1 (a) and (b), multiple rows of embedded materials arranged on the formwork (B) <Al )
(A2) (A3)..., for example, formwork (B
) After concrete is placed between rows (A1) and (A2) located on the end side, the next concrete is placed between rows (A3) and (A4) located closer to the center. Carry out pouring. That is, the next concrete placement should be done at least once.
This is done between the next two rows.

In this case, adjust the amount and viscosity of concrete,
After passing the concrete poured between rows (A1) and (A2) under rows (A1) and (A2), place the concrete between the adjacent rows (A3). Concrete layer (C1)
form.

Next, as shown in FIG. 1(b), columns (A3) and (A
4) Concrete poured between rows (83) and
After passing the concrete under the row (A4), stop the concrete in the middle between the adjacent rows (A2) and (A5) in the same way as above, and do not block the space between the rows. Column (A3)
A concrete layer (C2) is formed between and (A2) to be bonded to the concrete layer (C1).

Thereafter, concrete is sequentially placed in the same manner to form a concrete layer (C3) etc. that are combined with the concrete layer (C2).

According to this method, concrete is placed sequentially between every two rows after one row, and concrete layers of a predetermined size are joined together between the next rows that go around the bottom of the row. This allows concrete to be placed while easily visually confirming that no cavities have occurred due to poor bonding between concrete layers. Therefore, in this case, it is possible to reliably prevent the formation of a cavity or the like that may occur in the lower part of the embedding material. Moreover, leveling of concrete can be easily carried out by making the concrete layer (C4) in which the embedding material (A) is embedded as a subsequent process.

In addition, if the embedded material (A) is not a single piece but is made up of multiple layers of void formwork fitted together and stacked as described above, the casting pressure of the concrete of the embedded material (A) In order to prevent lateral displacement etc., the embedded material (A
It is necessary not to pour concrete up to the top of ) all at once.

And each concrete layer (C1) (C2) (C3)
Each column (A1
) (A2) (A3)... As shown in Figure 1 (e), pour concrete evenly from the top onto the embedded materials (A), and bury these embedded materials (A) completely. Form a concrete layer (C4). In this case, the concrete layer (C1) (C2) (C
In order to form I), the direction from the edge of the formwork (B) towards the center (in the direction of the arrow in Fig. 1 (a)) is reversed, and vice versa. It is suitable for the work to be carried out on the way back towards the direction).

In this way, after pouring the concrete layer (C4) to a predetermined level and performing known finishing processes, it was possible to complete the construction of the intended concrete slab. The symbol (D) in the figure is a concrete discharge hose.

In addition, in the above example, concrete was poured every two rows after one row of embedded material, but in addition, concrete was poured between two rows of embedded material after two or three rows of embedded material. Various construction changes can be made without departing from the gist of the invention, such as the possibility of pouring concrete every two rows.

<Effects of the Invention> As described above, according to the concrete on-site pouring method of the present invention, concrete is poured every two rows after at least one row, and the concrete formed by the poured concrete is The layers are joined between the next rows after going around the bottom of the row, and concrete is poured while easily confirming visually that no cavities have occurred due to poor bonding between concrete layers. Therefore, it is possible to reliably prevent the formation of cavities in the lower part of the embedded material, and it is possible to reliably prevent the formation of cavities that may cause a decrease in the strength of the concrete slab.

In addition, various effects such as leveling of concrete can be easily achieved by making the upper concrete layer in which the embedding material is buried as a subsequent process are achieved.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the implementation process of the concrete pour-in-place construction method according to an embodiment of the present invention, Figure 2 is a cross-sectional view of a concrete slab in which the concrete pour-in-place construction method is adopted, and Figure 3 is the embedded material. FIGS. 4 to 8 are enlarged perspective views of the support structure of FIG. (1)...Support structure (11)...Bearing force (1
7)...Press bar (20)...Lower through angle (21)...Upper through angle (A)...Embedded material (Al) (A2) (A3
) Column (B) Formwork (C1) (C2) to (C4) Concrete layer Patent applicant Shimizu Corporation Sekisui Plastics Co., Ltd. (and 1 other person)
□ Figure 3\B Figure 8

Claims (1)

[Claims] 1. Floating multiple concrete embedding materials Supported in the same position, the multiple In addition to supporting support in several rows, the necessary arrangement After applying the striations, concrete is poured. A place to bury the above concrete embedding material. In concrete on-site pouring construction method, Place concrete at least once Carry out the pouring process every two rows. Concrete formed by concrete between the next rows around the bottom of the rows. A component characterized by being combined with concrete on-site pouring construction method.