JPS6117651A - Concrete slab by in-site casting - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a concrete slab constructed on-site. More specifically, the present invention relates to a hollow concrete slab cast on-site in which an embedded material such as a synthetic resin foam is embedded to make the slab hollow.

Background and Prior Art> In recent years, construction of apartment complexes, general buildings, and mid-to-high-rise buildings has been carried out by forming concrete slabs by pouring on-site, which has been used to reduce the weight of slabs, improve soundproofing, and improve the performance of small beams. It is widely practiced to make slabs hollow in order to expand indoor space by removing them and to ensure long spans. In addition to hollow cylinders made of iron plates as embedding materials, recently plate-shaped bodies made of synthetic resin foam have also been used.

However, in order to increase the ratio of non-concrete portions in the slab by forming hollow cylinders from the iron plates, it is necessary to narrow the pitch at which the hollow cylinders are arranged. Therefore, when performing on-site construction using the above-mentioned hollow cylinder as an embedded material, first, after completing the assembly process of the lower end reinforcement, install the equipment piping for electrical and water supply and drainage damage, then set the hollow cylinder, and then install the top of the hollow cylinder. Finished assembling the upper end reinforcements at , then hooked the S-shaped starships that make up the beam reinforcements to the end and lower end reinforcements in the narrow space of the hollow cylinder, finished the reinforcement arrangement, and poured concrete. It is something to do. And the S-type starship mentioned above is stable because it has been hit with a hollow cylinder! However, it is difficult to install, so if the reinforcement is arranged before setting the hollow cylinder, it is difficult to stabilize due to lack of independence, and the condition of the reinforcement tends to collapse when setting the hollow cylinder, making it difficult to install. Ta. However, 1) Regarding equipment piping such as electricity, even if you try to pipe in a direction perpendicular to the length direction of the hollow cylinder after setting the hollow cylinder, the upper and lower layers of the slab are thin, so reinforcing bars etc. will get in the way. It was almost impossible to install proper piping, and the piping had to be done before setting the hollow tube.

Furthermore, in the case of an embedding material in which the iron plate is made into a hollow cylinder, the thickness of the iron plate is thin, so that holes or cracks may occur due to external impact or the like. Therefore, in rare cases, rainwater or construction water from these defective parts may enter the hollow cylinder, and the stored water may leak onto the ceiling surface after the building is completed.

On the other hand, when using a synthetic resin foam embedding material,
It maintains the ratio of the non-concrete part of the slab to a specified level while ensuring sufficient bullet holes, and also facilitates the installation work of embedded materials and is one of the combinations with reinforcing bars to be placed.
Therefore, the current situation is that a good shape is particularly required as an indentation material.

Purpose of the Invention The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a concrete slab cast on-site that facilitates construction and reduces costs.

Structure> The structure of the concrete slab cast on-site according to the present invention to achieve the above object includes a fixing device for the embedded material and a support and holding device for the embedded material in the concrete layer poured on-site. Polygonal column embedded materials made of synthetic resin foam are sequentially placed between the beam reinforcements, and the sides of the polygonal column embedded materials are vertically parallel to the vertical part of the starship that makes up the beam reinforcement. The upper and lower surfaces of the embedded material form horizontal planes parallel to the vertically horizontal force distribution bars, and the embedded material is characterized in that a hypotenuse portion is formed between the side surface and the upper and lower surfaces. be.

<Example> Next, an example of the present invention will be described below with reference to the drawings.

(1) is a polygonal column embedding material made of synthetic resin foam, such as polysbrene foam, with oblique sides (A
) is composed of a polygonal prism.

The embedded material (1) includes a supporting member (21) and a fixing member (22).
) for embedding material consisting of 1i! The embedded material (1) is firmly supported and held inside the concrete layer by the support member (21) having legs (21a).
), and the insertion shaft (22a) of the fixing member (22), which is fixed upright on the support member (21), is inserted into the insertion portion (11), and the insertion shaft (22a)
The upper surface is pressed and fixed by a presser plate (22b) having a stabbing blade-like locking part (22c) provided on the head. As for the legs (21a) of the support member (21), it is desirable that the tips thereof be subjected to rust prevention treatment in order to prevent stains from forming on the directly raised ceiling due to rust.

Specific examples of this anti-rust treatment include covering the tips of the legs (21a) with synthetic resin caps (21c), or directly plating the tips and ends (see Figure 2).

The fixing device (2) and the embedded material (1) supported and held by the fixing device (2) are equipped with necessary reinforcing steel such as do-end main reinforcement (31), lower-end distribution reinforcement (31'), beam-shaped Stirrups (32), l: which constitute the reinforcements, are placed at predetermined intervals between the beam-shaped reinforcements in the concrete layer cast on site, together with the main end reinforcements (33) and the upper end distribution jlW (33'). The sides (B) of the polygonal embedding material (1) are covered with stirrups (32
) forms a vertical plane parallel to the vertical part (32') of the upper and lower surfaces (
C) (C') is the upper and lower horizontal distribution bars (33') (31'
), and the rough embedded material (1) forms a horizontal plane parallel to the side surface (
A hypotenuse part (A) is formed between the upper and lower parts (C) and (C'), and the slab beam-like part (4
), an inclined widening part (D) is formed vertically at the oblique side part (A) of the embedding material (1).

If such an inclined expansion part (D) is configured, a continuous arch structure will be formed between the slab beam parts (4) [4], thereby reinforcing the slab strength of the upper and lower parts of the embedded material (1). As a result, extremely excellent performance can be achieved.

Next, the J method for concrete slabs with the above structure is as follows:
First, on the laid concrete panel (P), support members (21) and Insertion shaft (
A fixing member (23) for 22a) is erected (see FIGS. 4 and 5). This fixing member (23) is composed of a support ring (23a) that is brought into contact with the concrete panel (P), and a double-threaded bolt (23b) that is screwed up halfway into the inner diameter of this support ring (23a). ing.

When fixing, use a support ring (with a thread formed on the inside diameter).
After fixing 23a) from the back side of the concrete panel (P) using bolts (24), washers (25), nuts (26), etc., screw the double-threaded bolts (23b) onto the upper part of the support ring (23a), Directly above this is the support member (21
), insert a flanged sleeve (27) with an internal thread into the through hole (21b) on its L side, screw it onto both threaded bolts (23b), and tighten it ( (See Figure 2).

Next, insert the insertion shaft (22a) into the flanged sleeve (21).
(see FIG. 4), and place the implant (1) on the support member (21) while inserting the insertion shaft (22a) into the insertion portion (11). Then, insert the insertion shaft (2
Insert the holding plate (22b) having a stabbing blade-like locking part (22G) into the head of 2a), and tighten it with the pins (22d) to fix the implant (1) (see Figure 5). . If concrete is poured in this state and the embedded material (1) and support member (21) are surrounded by concrete, then
This means that the concrete slab described above can be formed.

Although the explanation was omitted above, the lower end main reinforcement (31
) and lower end distribution reinforcements (31') are arranged using the embedded material (
This is done at the appropriate time by J5 during the fixing work in step 1). Furthermore, the holding plate (22b) does not move the locking part (22c) to the right.
It can also be implemented using .

In addition, for installation, the above-mentioned set for supporting the embedded material)
Regarding the L structure, the fixing member (23), the supporting member (
21), sleeve with flange (27), double threaded bolt (
23b) and the insertion shaft (22a) are preferably assembled and integrated in advance.

As the fixing member (23) for fixing the implant (1), for example, as shown in FIG. 6, a plurality of elastically deformable divided pieces (22e) are provided at the tip of the insertion shaft (22a) in the axial direction.
This divided piece (22e) is elastically deformed and inserted into the hole (P') of the concrete panel (P), and the non-return claw (22f) at the tip prevents it from coming out, Fig. 7. As shown in Fig. 8, a screw nail (22g) or a screw nail formed at the tip of the insertion shaft (22a) and screwed into the concrete panel (P) is considered, as shown in Fig. 8.
At the tip of the insertion shaft (22a), a plurality of divided pieces (22h) which are divided in the axial direction and can be expanded outward are removably formed by screwing together, and are separated from the insertion shaft (22a).] Recording piece (2
2h) is inserted into the hole (P') of the concrete panel (P), expanded outward by the blow of the bottle (22i) and fixed, and then the insertion shaft (22a) is screwed into the hole, etc. Many things can be adopted.

Further, the supporting member (21) on which the embedded material (1) is placed is not limited to the one shown in the figure, but a concrete panel (
P) Various structures can be adopted as long as they can support the embedded material (1) floating thereon.

Furthermore, as the synthetic resin foam forming the embedding material (1), in addition to the aforementioned borisdylene foam, foams manufactured from polyethylene, polypropylene, polyvinyl chloride, copolymers mainly composed of these, etc. Those formed with a body can also be used.

According to the cast-in-place concrete slab of the present invention constructed as described above, the fixing device for the embedding material and the embedding material in the form of a polygonal column made of synthetic resin foam are successively placed between the beam reinforcements. The sides of the polygonal column embedding material form a vertical plane parallel to the vertical part of the starship that makes up the beam reinforcement, so compared to the case of conventional hollow tube embedding, the side surface of the polygonal column embedding material is It is possible to increase the spacing between the embedded materials without significantly reducing the non-concrete parts, making it easier to assemble beam reinforcements. It is also possible to install it before setting, making it easier to set beam bars in a stable state. In addition, when setting the embedded material between the beam bars afterwards, the embedded material is made of lightweight synthetic resin foam, and its upper and lower surfaces have horizontal surfaces parallel to the horizontal distribution bars. Due to its stable shape, it is easy to handle and set up. Furthermore, since the above-mentioned embedded material forms a hypotenuse between its side surface and the upper and lower surfaces, the slab beam-like portions are expanded at an angle at the top and bottom, and the slab beam-like portions form a continuous arch structure. The slab strength can be increased and excellent performance can be demonstrated. Therefore, not only can the space inside the Y be made wider, but also the reinforcing work is easier, which greatly contributes to reducing the cost of concrete slabs.

In addition, since this invention uses a synthetic resin foam as the embedding material, the embedding material can be changed as necessary even after the embedding material is set for electrical equipment piping. By notching or perforating a portion, piping can be freely installed while maintaining the necessary concrete cross section with thin walls on the top and bottom. In addition, the direction of the notches and holes in the embedded material can be made diagonally, allowing piping to be installed over the shortest possible distance, which is useful for saving on piping during construction of concrete slabs cast on-site.

Furthermore, since the embedding material is made of synthetic resin foam, the inconvenience that rainwater or construction water may accumulate in the embedding material is also eliminated, which is advantageous.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, and FIG. 1 is a sectional view, FIG. 2 is a front view showing how the support member is installed, and FIG.
The figures are exploded perspective views of the main parts of the fixing device for embedded materials, Figures 4 and 5.
The figure is a perspective view showing the construction in progress, and FIGS. 6 to 8 are sectional views showing other embodiments. (1)...embedding material, ('2J...fixing device for embedded material,
(21)...Supporting member, (23)...Fixing member, (
22a)...insertion shaft, (31)... is end stop muscle, (3
1')...Bottom distribution reinforcement, (32)...Stirrup, (33)...Top main reinforcement, (33')...Top distribution reinforcement, (4)...Slab beam shape (A)...Hytenuse part of the embedding material, (B)...Side surface, (C) (C')...Top and bottom surfaces, (D)...Slanted expansion part, (P) ...Concrete panel.

Claims (1)

[Claims] 1. In the concrete layer poured on site A fixture for the embedded material and support with the fixture Polygonal prism made of supported synthetic resin foam embedding materials are placed sequentially between the beam bars. The sides of the embedded material of the polygonal column are beam-shaped reinforcements. parallel to the vertical part of the stirrup that makes up the The top and bottom surfaces of the embedding material are vertical. It forms a horizontal plane parallel to the horizontal distribution bar, and In addition, the embedding material has a hypotenuse area between the side and top and bottom surfaces. On-site construction, which is characterized by forming Concrete slab by including. 2. The fixture for the embedded material is a support member with legs. and a fixing member through which the embedding material is inserted. Claim 1 stated above Concrete slab poured in place.