JPS6012013Y2 - Embedment material for concrete slabs - Google Patents

Description

[Detailed explanation of the invention] This invention is related to the embedded material used in the construction of concrete slabs, and is designed to prevent the step part that is attached to the concrete slab from being damaged during transportation. be.

In recent years, with the development of high-rise buildings, issues such as reducing the weight of buildings, industrializing building materials, lowering transportation costs, and saving labor in equipment piping have been raised.

For this reason, the construction method for reinforced concrete slabs used as flooring, ceiling, and wall materials in buildings is to increase the thickness of each slab to increase its strength, and to make the interior hollow to reduce weight and improve sound insulation. Various construction methods have been put into practical use; specifically, hollow boxes made of iron plates are used as embedding materials in concrete for hollow construction, steel pipes, slate pipes, concrete pipes, and water-resistant cardboard forms. A construction method using

However, both construction methods have drawbacks in terms of productivity, such as the time required to manufacture the hollow embedding material.Also, hollow boxes made of iron plates and embedding materials made of electrode tubes have their own weight even if hollowed out. Therefore, further improvements are required in terms of weight reduction, and there are also difficulties in transportation.

Furthermore, even if water-resistant cardboard embedding materials have been treated to be water-resistant, they are still made of cardboard, so they are easily deformed when installed in the rain, and require covering with a seat cover in the event of rain after installation. And it was very troublesome.

In addition, this cardboard embedding material has a low degree of water resistance and easily absorbs water, which also has the disadvantage that the concrete is likely to crack after being placed.

In addition to the various embedding materials mentioned above, various attempts have been made to use synthetic resin foam as a lighter embedding material by embedding it in concrete (
For example, see Japanese Utility Model Publication No. 50-2713 & Utility Model Publication No. 52-4434), both of which lacked the stability and simplicity required for slab construction as means for fixing foam.

Therefore, compared to the conventional construction methods using each of the above-mentioned embedding materials, synthetic resin foam molding is an excellent construction method that facilitates construction, reduces weight, and improves cross-sectional performance (cross-sectional strength) and sound insulation performance. The embedding material consisting of is placed during the curing process when the concrete substrate has not yet solidified, and the embedding material is fixed to the concrete substrate using a locking tool, and as the concrete substrate hardens, a part of the embedding material is embedded in the concrete. We have already developed and proposed an installation method for embedding materials that connects and secures the embedding material to the concrete substrate via locking tools.

As an embedding material made of a foamed molded product used in such construction, an embedding material 1 is used, which has a step 2 protruding outward from the periphery as shown in Fig. 1 so that the locking tool can be easily pierced. However, in the case of this embedding material 1, the above-mentioned stepped portion 2 protruding to the outside may be damaged during transportation of the embedding material 1, which may impair its practicality.

Therefore, in this invention, the disadvantages such as the step part 2 in the above-mentioned embedding material 1 are eliminated, and it is possible to provide a very practical installation work for the embedding material described above. The structure is such that a plate-like body made of a rigid foam has a stepped portion extending inward from the periphery where a locking device is used to fix the plate-like body to a concrete substrate. It is characterized by forming a plurality of plate-like bodies by removing a part of them.

Next, embodiments of this invention will be illustrated below with reference to the drawings.

Reference numeral 10 denotes a plate-shaped body formed of a hard foam such as polystyrene foam, which serves as an embedding material, and 20 indicates a part of the plate-shaped body 10 where a locking tool 50 is used for fixing the plate-shaped body 10 to a concrete substrate. This is a step formed by cutting out a part inward from the peripheral part 30, and the removed part of the step 20 is from the upper part of the plate-shaped body 10 to the middle of the wall thickness, and is located at an appropriate position in the peripheral part 30. It forms a plurality.

Note that the step portion 20 can be formed either simultaneously during molding or by cutting after molding, but the former is advantageous in that it does not require as much manufacturing effort. The shapes are not limited to those shown in the figures.

Furthermore, the plate-like body 10 may have a shape with a solid interior, but it is suitable to have a space 40 formed on the bottom side in order to save material and promote lightweight construction. There is.

In addition, the plate-shaped body 10 which becomes the embedding material according to the above-mentioned invention
In addition to polystyrene foam, various rigid foams can be used.

The embedding material of this invention, which has the above-mentioned configuration, is installed on a concrete slab substrate.To give an overview of the example, first, the concrete substrate C of the lower layer of the slab is placed in the formwork A. The concrete is poured to the required thickness and placed, and during the curing process when the concrete substrate C has not yet solidified, the plate-shaped body 10 made of the foam molded product of this invention is placed as an embedding material. The plate-like body 10 is fixed to the concrete substrate C by using a locking tool 50 on the stepped portion 20 of the plate-like body 10 by a piercing action or the like (see FIGS. 3 and 4).

Then, by solidifying the concrete substrate C, the embedding material made of the plate-shaped body 10 can be attached and fixed to the concrete substrate C.

The locking tool 50 used above has various structures and types, and the locking tool 50 used in FIG. 3 (FIG. 4)
As shown in the figure, when the piece parts 53 and 54 are bent at a substantially right angle at the notch 51 and the bending part 52, and have a piercing part 55 at the lower part and a holding piece 56 at the upper part, the piece parts 53 and 54 have two parts. Generates a counterforce to the force in the direction.

For example, when curing concrete substrate C, a long sheet is covered from one end, but at this time, the sheet has the drawback of pulling the embedded material, so the above-mentioned counterforce is used to prevent the sheet from dragging in one direction. Even if a worker may step on the concrete substrate C and kick it after the concrete substrate C has solidified, the counterforce described above can prevent the embedded material from shifting.

In addition, there are locking tools 50a1 shown in FIG. 7 used as shown in FIG. 6, and locking tools 50b and 50c shown in FIGS. is suitable, especially for recesses 57 such as holes and grooves as shown in the figure.
It is preferable that the fixing effect of the embedded material to the concrete substrate C can be further strengthened by providing a convex part 58 such as a claw, a hook-shaped part, or a cut-out part. It can be used in various ways.

Furthermore, in Fig. 3 showing the state of use of the plate-shaped body 10 which is the embedded material of this invention, B indicates the reinforcing bars installed upright on the concrete substrate C, and the imaginary line C' indicates the slab to be cast during concrete slab construction. This is the concrete on the upper layer side.

As mentioned above, the plate-like body 10 is used as an embedding material attached to a substrate for a concrete slab, and in the case of this invention, the plate-like body 10 formed of a hard foam as the embedding material is used as an embedding material. Since the stepped portion 20 is not formed by protruding outward from the peripheral portion 30, but is formed by cutting a portion inward from the peripheral portion 30, the stepped portion 20 is recessed during handling such as transportation. Because of the shape, there is no chance of the locking device hitting other objects or hitting each other (therefore, there is no risk of damage etc., and even if the locking tool is inserted into the stepped portion 20 and used). This provides various excellent practical effects such as being able to install the embedded material with as little protrusion as possible, and improves the installation work of the embedded material to the concrete slab substrate.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing a conventional implant, Fig. 2 is a perspective view showing an embodiment of this invention, Fig. 3 is a sectional view in use, and Fig. 4 is a partially perspective view. Figure 5 is a perspective view of the locking tool used to attach the implant, Figure 6 is a perspective view of a part using a different locking tool, and Figure 7 is the locking tool used previously. FIGS. 8 and 9 are perspective views showing the other side of the locking device. 10...Plate-shaped body serving as an embedding material, 20...
・Stepped part, 30...Peripheral part, 40...Space, 50...5°ag 50 bg 50
c...Locking tool.

Claims (1)

[Claims for Utility Model Registration] 1. A plate-like body made of a rigid foam has a stepped part that is used as a locking tool for fixing the plate-like body to a concrete substrate, from the periphery to the inside. An embedding material for concrete slabs, characterized in that it is formed by forming a plurality of plate-like bodies by cutting out a part of them in one direction. 2. The concrete slab embedding material according to claim 1 of the above-mentioned utility model registration, wherein the plate-shaped body has a space provided on the bottom side. 3. The concrete slab embedding material according to claim 1 of the above-mentioned utility model registration, wherein the plate-like body is formed of polystyrene foam.