JP2009215776A - Void unit allowing attachment/detachment of embedded body and preventing formation of air bubble - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an embedded body unit 10 having a structure facilitating attachment/detachment of an embedded body 20 and preventing the formation of air bubbles after placing concrete in a concrete slab construction method using a lightweight body. <P>SOLUTION: The embedded body unit 10 is formed of: the embedded body 20 formed by fitting and assembling an embedded body upper element 21 formed of a synthetic resin material, and an embedded body lower element 22 formed of a foam synthetic resin; and an embedded body fixing metal fitting 30 having a support reinforcement 31 and embedded body fixing reinforcements 32 orthogonally joined to the support reinforcement 31 at fixed spaces and fitted into a middle fitting groove 24 and side fitting grooves 25a, 25b formed in the embedded body upper element 21 to connect the support reinforcement 31 to the embedded body 20 by bending a fixed cover 26 to connect the fixed cover 26 to hooks 27a, 27b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique for forming a lightweight concrete slab by embedding an embedded body (void) made of a lightweight material in a reinforced concrete slab of a building.

A concrete void slab method in which an embedded body made of a lightweight material is embedded in concrete is known.
That is, an embedded body made of a lightweight material called a void is appropriately disposed on the upper surface of the formwork plate, and then concrete is placed.
Thereby, a hollow part is formed in concrete, weight reduction of a concrete slab can be achieved, and sound insulation etc. can be improved.

By the way, in the conventional concrete void slab method, there existed a problem that an embedding body floated or moved at the time of concrete placement.
That is, since the embedded body is made of a lightweight material, for example, polystyrene foam, a large buoyancy is applied when placing concrete, and the embedded body moves even if it is placed at a predetermined position of the concrete slab. It is not always easy to embed an embedded body at a designed position.

In order to prevent such floating and movement of the implant, two support muscles arranged substantially parallel to one of the top muscles arranged vertically and horizontally, and the above support muscles There are some which use an implant fixing bracket made of an implant fixing portion which is bonded to the above and fixes the above-mentioned implant so as to correspond to the length of an ordinary human hand.
The patent document shown below arrange | positions such an embedded body fixing metal fitting on an upper end line. Then, the embedded body fixing bracket is fixed by binding to the upper end muscle, and the embedded body fixing portion is inserted into the insertion hole formed in the embedded body, so that the fixed state of the embedded body is ensured. It is possible to prevent the embedded body from being easily detached from the embedded body fixing portion, and to provide a homogeneous concrete slab.

Patent Publication 2005-163340

  However, in the void slab method described in the above-mentioned public relations, it is necessary to separate the embedded fixture from the embedded body, and the separated implant cannot be used unless it is connected to the fixed fixture. Work and linkage work occur. When separating the implant and the fixture for fixing the implant, the insertion hole of the implant may be damaged. Even if the damaged implant is connected to the implant fixture, the fixed state is ensured. In addition, there is a problem that fragments due to the damage of the embedded body are scattered, making recovery difficult.

  Further, in the void slab method described in the above public relations, when the foamed synthetic resin embedded body is used for forming the hollow portion, the foamed synthetic resin is applied by the pressure from the surroundings after the concrete is placed. The air that was present inside the embedded product was pushed and exited as bubbles continuously for several hours, and bubble marks with a diameter of about 2 to 3 mm could remain on the surface of the hardened concrete slab. Such bubble marks may cause intrusion of water or the like, and may cause a decrease in concrete strength in the future.

In the invention described in claim 1, an embedded body (6) made of a lightweight material is positioned in a space (5) between the upper and lower reinforcing bars (3) and (4) arranged vertically and horizontally. An embedded unit (10) in which a plurality of embedded bodies (6) used in a concrete void slab method for burying an embedded body (6) in a concrete slab (1) are connected by an embedded body fixing bracket (2). Because
An embedded upper element (21) made of a synthetic resin material shaped like a sphere and an elliptical sphere outer shell, and a foamed synthetic resin shaped like a sphere and an elliptical sphere outer shell. An implant (20) formed by assembling together the opening perimeter (23) of an implant lower element (22) comprising:
Of the upper end bars (3) arranged vertically and horizontally, the support bars (31) arranged substantially parallel to one of the upper end bars (3x) and the support bars (31) joined in the orthogonal direction at a constant interval. Is inserted into the intermediate fitting groove (34) and the side fitting grooves (35a, 35b) formed in the implant upper element (31), and the implant upper element fixing lid (36) is bent. Implant having an implant fixing muscle (32) for connecting the support muscle (31) and the implant (20) by connecting the lid (36) and the collar (37a, 37b) having a snap-fit mechanism. It consists of a body fixing metal fitting (30).

  According to the second aspect of the present invention, the embedded body upper element (21) of the embedded body (20) is formed of a synthetic resin material having confidentiality.

  According to the first aspect of the present invention, it is possible to embed the embedded body (20) at a predetermined design position in the concrete slab (1) with a simple structure. Can be provided.

  According to the invention described in claim 1, the embedded body fixing muscle (32) is inserted into the intermediate insertion groove (26) and the side insertion groove (27 a, 27 b) of the embedded body (20), and the fixing lid (26 ) Can be fixed, the structure (20) can be fixed easily, and its mounting (fixing) workability can be greatly facilitated. In addition, by opening the fixing lid (26), the implant fixing muscle (32) inserted in the intermediate fitting groove (26) and the side fitting grooves (27a, 27b) of the implant (20) can be easily removed. The embedded body (20) can be removed from the embedded body fixing hardware (30), so that the embedded body (20) is not damaged, and the embedded body (20) can be reused. The fragments of the embedded body (20) are not scattered.

  According to the invention described in claim 2, by forming the embedded upper element (21) with a synthetic resin layer having airtightness, the embedded lower element (22) made of foamed synthetic resin and the cavity portion are formed. The generation of bubbles is prevented, and a hollow concrete slab having no bubble traces can be formed.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view (disassembled state) of the embedded unit (10). Since the upper hemisphere of the spherical embedded body (20) is formed of the synthetic resin layer, generation of bubbles from the embedded lower element (22) made of the foamed synthetic resin and the cavity is prevented.

  FIG. 2 shows a procedure for connecting the implant fixing muscle (32) and the implant upper element (21). (A1) is a front view of the implant upper element (21) and the implant fixing muscle (32) in a separated state, (a2) is the same plan view, and (a3) is the same side view. (B1) is a front view showing a state in which the implant fixing bar (32) is inserted into the middle fitting groove (24) and the side fitting grooves (25a, 25b) of the implant upper element (21), and (b2) is the same. A plan view, (b3) is the same side view. (C1) bends the fixing lid (26) of the implant upper element (21), and connects the fixing lid (26) and the hooks (27a, 27b) having a snap-fit mechanism to 21) is a front view of the state where the embedded fixture (30) is coupled, (c2) is a plan view, and (c3) is a side view. The implant upper element (21) and the implant fixation muscle (32) can be easily attached and detached by bending the fixation lid (26), and connecting and separating the fixation lid (26) and the hooks (27a, 27b).

  FIG. 3 shows the implant unit (10) in a connected state. (A) is a top view, (b) is a side view.

FIG. 4 shows an example of the shape of the embedded body (20). (A) is a spherical shaped implant (20), and (b) is an elliptical spherical implant (20).

FIG. 5 shows a concrete slab construction method using the embedded unit (10) of the present invention. Fig.4 (a) is a sectional side view which shows the state which arranged the upper end reinforcement (4x, 4y) and the lower end reinforcement (3x, 3y) in the concrete slab construction method. FIG.4 (b) is a sectional side view which shows the state just before arrange | positioning the embedding body unit (10) in concrete slab plan space. FIG.4 (c) is a sectional side view which shows the state which has arrange | positioned the embedded body unit (10) in the concrete slab planned space. FIG.4 (d) is a sectional side view which shows the state which has poured concrete (c).

It is sectional drawing (disassembled state) of an embedded body unit (10). The connection procedure of an implant fixation muscle (32) and an implant upper element (21) is shown. It is a top view and an elevation view of an embedded unit (10). It is the elevation which showed the example of the shape of an embedding body. The work procedure of the concrete slab construction method using the embedded unit (10) of the present invention is shown.

Explanation of symbols

2 Formwork plate 3x Bottom line (lower side)
3y Bottom muscle (upper side)
4x upper muscle (upper)
4y upper muscle (lower side)
DESCRIPTION OF SYMBOLS 10 Embedded body unit 20 Embedded body 21 Embedded body upper element 22 Embedded body lower element 23a Upper opening peripheral edge 23b Lower opening peripheral edge 24 Middle insertion groove 25a Side insertion groove 25b Side insertion groove 27 Fixed lid 28a 鉤 28b 鉤 30 Fixing bracket 31 Supporting bar 32 Implant fixing bar C Concrete

Claims (2)

An embedded body (6) made of a lightweight material is positioned in a space (5) between the upper and lower bars (3) and (4) arranged vertically and horizontally, and the embedded body (6) is placed in a concrete slab. (1) An embedded unit (10) in which a plurality of embedded bodies (6) used in a concrete void slab method embedded in an embedded body are connected by an embedded body fixing bracket (2),
An embedded upper element (21) made of a synthetic resin material shaped like a sphere and an elliptical sphere outer shell, and a foamed synthetic resin shaped like a sphere and an elliptical sphere outer shell. An implant (20) formed by assembling the upper opening periphery (23a) and the lower opening periphery (23b) of the embedded lower element (22) comprising:
Of the upper end bars (3) arranged vertically and horizontally, the support bars (31) arranged substantially parallel to one of the upper end bars (3x) and the support bars (31) joined in the orthogonal direction at a constant interval. Is inserted into the intermediate fitting groove (24) and the side fitting grooves (25a, 25b) formed in the above-mentioned embedded body upper element (21), and the fixed lid (26) is bent to fix the fixed lid (26). And an anchor (27a, 27b) having a snap-fit mechanism to connect the support muscle (31) and the implant (20) to the implant body fixing bracket (32) that has the implant body fixing muscle (32). 30), an implantable unit (10).   An embedded unit (10), wherein the embedded upper element (21) of the embedded body (20) is formed of a synthetic resin material having confidentiality;

Images