JP2002061323A - Precast concrete plate, slab, construction method for slab, and structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a precast concrete plate, a slab, a construction method for the slab, and a structure allowing disposal without separating concrete from a lightweight form when dismantling the slab. SOLUTION: This precast concrete plate 1 is formed by providing a lightweight cement member 4 at the upper face of a concrete plate 2 with truss reinforcements 3 arranged at appropriate spaces, extending along the long side direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a precast concrete plate, a slab using the precast concrete plate, a method for constructing the slab, and a structure.

[0002]

2. Description of the Related Art As shown in FIG. 18, a slab of a reinforced concrete structure is formed by casting a top concrete 35 on a precast concrete plate 34 on which a lightweight styrofoam form 33 is disposed.

[0003]

When the above slab is dismantled, it is necessary to treat concrete and a lightweight styrofoam form separately. However, separating the concrete and the lightweight formwork is extremely difficult and time-consuming.

The present invention has been made in view of these problems, and an object of the present invention is to provide a method for constructing a precast concrete plate, a slab, and a slab that can be processed without separating concrete and lightweight formwork when the slab is dismantled. And providing structures.

[0005]

Means for solving the above problems are as follows: a precast concrete plate according to the first aspect of the present invention is a concrete plate in which truss bars along the long side direction are arranged at appropriate intervals. A light-weight cement member is formed on the upper surface of the precast concrete plate of claim 2; and the light-weight cement member is formed on substantially the entire surface of the concrete plate in claim 1, The precast concrete plate according to the third aspect of the present invention is the same as the first aspect, except that
The precast concrete plate according to claim 4 is formed by embracing every other truss bar, and the lightweight cement member according to claim 1 is formed only at a portion where the truss bar is arranged. The precast concrete plate of the invention of claim 5 is characterized in that, in claim 1, the lightweight cement member is formed between truss bars, and the precast concrete plate of the invention of claim 6 is In claim 1, the lightweight cement member is formed so as to be orthogonal to the plurality of truss bars, and the precast concrete plate of the invention according to claim 7 is provided with a reinforcement along the long side direction on the upper surface of the concrete plate. 9. The precast device according to claim 8, wherein ribs are projected at appropriate intervals, and a lightweight cement member is formed between said reinforcing ribs. A concrete plate according to claim 7, wherein the lightweight cement member is formed at appropriate intervals in the longitudinal direction of the reinforcing rib, and the slab according to claim 9 is a precast concrete plate according to claims 1 to 8. 11. The invention according to claim 10, wherein at least one or more of the precast concrete plates is disposed adjacently between beams to form a lower floor, and top concrete is cast on the lower floor. The method of constructing a slab is characterized by arranging a precast concrete plate adjacent to between beams to form a lower floor, placing a lightweight cement member on the lower floor, and then placing top concrete, An eleventh aspect of the present invention provides a structure comprising the slab of the ninth aspect.

[0006] When the slab is dismantled, the concrete and the lightweight cement member can be treated without being separated, so that it is possible to prevent the occurrence of environmental problems. The shape and dimensions of the lightweight cement member can be freely determined. Since the lightweight cement member does not absorb water, there is no need for water drainage measures. A lightweight cement member can be formed by embracing a plurality of truss bars.
Since the lightweight cement member is strongly alkaline, it is possible to prevent rust from being generated on the truss bars. Since the resonance phenomenon does not occur, the floor impact sound blocking performance is improved. Integrated production at the factory. In addition, fire resistance is increased due to low thermal conductivity. In addition, when dismantling slabs, concrete and lightweight cement members can be treated without separation, eliminating drainage measures, preventing rust on truss bars, and easily constructing slabs with high floor impact sound insulation performance and fire resistance. can do.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a precast concrete board (hereinafter referred to as a PC board) of the present invention is shown in FIGS.
After describing the embodiment of the slab with reference to FIGS. 11 to 15, the embodiment of the slab construction method will be described with reference to FIGS. 16 and 17. There are seven embodiments of the PC board described above. In each embodiment, the same components are described with the same reference numerals, and only different configurations are denoted with different reference numerals.

FIGS. 1 to 3 show a PC board 1 according to a first embodiment.
It is shown. The PC board 1 includes a flat rectangular concrete board 2, a truss bar 3 arranged along the long side direction of the concrete board 2, and a lightweight cement member 4 formed by embracing the truss bar 3. It is composed of

The lightweight cement member 4 embraces all the truss bars 3 except for the truss bars 3 at both ends of the long side of the concrete plate 2. The lightweight cement member 4 is a foam mortar 12 in which a foam material and mortar manufactured by forcibly blowing a foaming agent solution together with compressed air into a foaming machine are mixed. Since the closed cell 5 is formed, the cell mortar 12 is lightweight, does not absorb water, and has high fire resistance.

The lightweight cement member 4 is composed of expanded shale, expanded clay, expanded slate,
Lightweight cement members that mix water and cement with artificial light aggregates such as perlite, obsidian, anti-firestone, vermiculite, and by-product lightweight aggregates such as expanded slag, coal ash, waste glass, and sludge, and water and cement And a lightweight cement member mixed with
It is also possible to use a lightweight cement member in which natural lightweight aggregate such as volcanic ash and coal waste, water and cement are mixed.
Further, as the lightweight cement member 4, cement milk in which cement, water and the foam material are mixed, or a material in which reinforcing fiber material is mixed with this cement milk can also be used.

As shown in FIG. 2, the truss muscle 3 is a lattice muscle 8 in which one upper chord muscle (top muscle) 6 and two lower chord muscles (lower muscle) 7 are arranged in a triangular shape. A joined triangular prism truss, the upper chord 6 protrudes from the upper surface of the concrete plate 2, and the lower chord 7 is joined to the bending reinforcement 9 in the concrete plate 2. Fig. 2
The truss bars shown in FIG. 4 are not limited to those shown in FIG.

FIG. 3 shows a method of forming the lightweight cement member 4. After protecting the truss bars 3 on both sides with a weir plate 10, a foam mortar 12 is inserted between the weir plates 11 with a hose 13.
And formed by pouring. As described above, since the closed cells 5 are mixed before curing and the cell mortar 12 is rich in fluidity, the cell mortar 12 can be formed by holding the truss streaks 3 and can be formed in an arbitrary position and an arbitrary shape.

FIG. 5 shows a PC board 14 according to a second embodiment. This PC board 14 is formed of a lightweight cement member 4 with the truss bars 3 sandwiched between the center portion and both side portions, that is, every other truss bar 3 embraced. This is the same configuration as the PC board 1 of the embodiment. Since the independent lightweight cement members 4 are formed on both sides of the central truss bar 3 in this way, the floor impact sound insulation performance of one PC board 14 can be changed.

FIG. 6 shows a PC board 15 according to a third embodiment. The PC board 15 has the lightweight cement member 4 formed only in a state in which the truss bars 3 are held, that is, only in the portion where the truss bars 3 are arranged. It has the same configuration as the PC board 1.
When the lightweight cement member 4 is formed only in the portion where the truss bars 3 are arranged as described above, the structure becomes the same as that of the PC board having the reinforcing rib projecting from the upper surface (not shown).

FIG. 7 shows a PC board 16 according to a fourth embodiment. The PC board 16 is formed by forming a lightweight cement member 4 having substantially the same length as the truss bars 3 between the truss bars 17, and has the same configuration as the PC board 1 of the first embodiment except for this.

FIG. 8 shows a PC board 18 according to a fifth embodiment. This PC board 18 is provided between the truss bars 17.
The lightweight cement member 4 divided into small pieces is formed.

FIGS. 9A and 9B show a PC board 19 according to a sixth embodiment. This PC board 19
Is formed by embedding a lightweight cement member 4 orthogonally to the truss bars 3 and embracing them, and has the same configuration as the PC board 1 of the first embodiment except for this. Further, (1) and (2) merely differ in the width of the lightweight cement member 4. When such a lightweight cement member 4 is used, the arrangement of connecting bars (not shown) in the horizontal direction (vertical direction in the figure) of the PC board 19 can be simplified.

FIGS. 10A and 10B show a PC board 20 according to a seventh embodiment. This PC board 2
Numeral 0 denotes a structure in which the lightweight cement member 4 is formed between the reinforcing ribs 23 of the PC board 22 with the reinforcing ribs. The structure other than the reinforcing ribs 21 is the same as that of the PC board 1 of the first embodiment. In the above (1), the lightweight cement member 4 is formed on the entire surface between the reinforcing ribs 23, and in (2), the lightweight cement member 4 is formed on the reinforcing rib 23 at appropriate intervals.

Next, an embodiment of a slab using the above-mentioned PC board will be described with reference to FIGS. This slab has three embodiments. In each embodiment, the same components as those of the PC board will be described with the same reference numerals, and only different components will be described with different reference numerals.

FIGS. 11 and 12 show a slab 24 according to the first embodiment. The slab 24 is formed by connecting the PC board 1 (see FIG. 1) of the first embodiment to a long beam 25.
And a short beam 26 to form a lower floor 27, on which a top slab 28 is laid and top concrete 29 is cast. Connecting bars 30 are arranged between the PC boards 1 and between the PC board 1 and the beams 25 and 26, so that a load acting on the peripheral portion can flow in two directions. This makes it possible to construct a void slab with excellent fire resistance, sound insulation (floor impact sound insulation performance), and waterproofness.

FIGS. 13 and 14 show a slab 31 of the second embodiment using the PC board 14 (see FIG. 5) of the second embodiment. And the same effect can be achieved.

FIG. 15 shows a PC board 19 according to the third embodiment.
This is a slab 32 according to the third embodiment using (see (1) in FIG. 9), and can achieve the same effect as the two slabs 24 and 31 described above.

The slabs 24, 31, 32 of the present invention
Are not limited to the above-described PC boards 1, 14, and 19, and the PC boards 15, 16, 18, and 20 shown in FIGS.
Can also be used.

FIGS. 16 and 17 show a method of constructing a slab. First, the lower board 27 is formed by laying the PC board 1a with the truss bars 3 projecting from the upper surface in an adjacent state between the long beam 25 and the short beam 26. Then, the foam mortar 12 as the lightweight cement member 4 is cast on the entire surface of the lower floor 27 so that the top of the truss bar 3 projects. Next, after the cellular mortar 12 is hardened, the top concrete 29 is placed and the top concrete 29 is placed. Thus, the slab 36 which is lightweight, does not absorb water, and has fire resistance is constructed.

It is also possible to construct a steel structure, a reinforced concrete structure and a steel reinforced concrete structure provided with the slabs 24, 31, 32, 36 shown in FIGS. 11, 13, 15, and 16.

[0026]

The concrete and the lightweight cement member can be treated without being separated when the slab is dismantled.

The shape and dimensions of the lightweight cement member can be freely determined.

Since the lightweight cement member does not absorb water, there is no need to take measures to remove water.

A plurality of truss bars can be embraced to form a lightweight cement member.

Since the lightweight cement member is strongly alkaline, it is possible to prevent the truss from being rusted.

Since no resonance phenomenon occurs, the floor impact sound blocking performance is improved.

An integrated production can be performed in a factory.

Since the thermal conductivity is low, the fire resistance is increased.

A slab that is lightweight, does not absorb water, and has high fire resistance can be easily constructed.

[Brief description of the drawings]

FIG. 1A is a plan view of a PC board according to a first embodiment,
(2) is a sectional view taken along the line AA of (1), and (3) is a sectional view of B of (1).
FIG. 4 is a partially omitted cross-sectional view taken along line -B.

FIG. 2 is a perspective view of a truss muscle.

FIG. 3 is a perspective view showing a method for forming a lightweight cement member.

FIGS. 4 (1) to (10) are a side view and a front view of another truss bar.

FIG. 5A is a plan view of a PC board according to a second embodiment,
(2) is a sectional view taken along line CC of (1).

FIG. 6A is a plan view of a PC board according to a third embodiment,
(2) is a sectional view taken along line DD of (1).

FIG. 7A is a plan view of a PC board according to a fourth embodiment,
(2) is a sectional view taken along the line EE of (1), and (3) is an F-line of (1).
It is a partial omission sectional view of the -F line.

FIG. 8 is a plan view of a PC board according to a fifth embodiment.

FIGS. 9A and 9B are PCs according to a sixth embodiment;
It is a top view of a board.

FIGS. 10 (1) and (2) show P of the seventh embodiment.
It is a perspective view of C board.

FIG. 11 is a partially cutaway plan view of the slab according to the first embodiment.

FIG. 12 is a sectional view taken along line GG of FIG. 11;

FIG. 13 is a partially cutaway plan view of the slab according to the second embodiment.

FIG. 14 is a sectional view taken along line HH of FIG.

FIG. 15 is a partially cutaway plan view of a slab according to a third embodiment.

FIG. 16 is a plan view showing a method of constructing a slab.

FIG. 17 is a cross-sectional view illustrating a method of constructing a slab.

FIG. 18A is a partially cutaway sectional view of a conventional slab.
(2) is a sectional view taken along the line II of (1), and (3) is a J of (1).
FIG. 4 is a partially omitted cross-sectional view taken along line -J.

[Explanation of symbols]

1, 14, 15, 16, 18, 19, 20, 34 PC
Plate 2 Concrete plate 3 Truss bar 4 Lightweight cement member 5 Closed cell 6 Upper chord 7 Lower chord 8 Lattice streak 9 Bending reinforcing bar 10 Weir plate 11 Between dam plates 12 Bubble mortar 13 Hose 17 Between truss bars 21 Reinforcement rib 22 PC with rib Plate 23 Between reinforcing ribs 24, 31, 32, 36 Slab 25 Long beam 26 Short beam 27 Lower floor 28 Slab upper end bar 29, 35 Top concrete 30 Connecting bar 33 Lightweight formwork

[Procedure amendment]

[Submission date] September 11, 2000 (2009.1.
1)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

The lightweight cement member 4 embraces all the truss bars 3 except for the truss bars 3 at both ends of the long side of the concrete plate 2. The lightweight cement member 4 is a bubble mortar 12 mixed with air bubbles material fabricated with a mortar blown forcibly into the foaming agent solution foamed machine with compressed air. Since the closed cell 5 is formed, the cell mortar 12 is lightweight, does not absorb water, and has high fire resistance.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

The lightweight cement member 4 is composed of expanded shale, expanded clay, expanded slate,
Lightweight cement members that mix water and cement with artificial lightweight aggregates such as pearlite, obsidian, anti-firestone, vermiculite, and by-product lightweight aggregates such as expanded slag, coal ash, waste glass, and sludge, and water and cement And a lightweight cement member mixed with
It is also possible to use a lightweight cement member in which natural lightweight aggregate such as volcanic ash and coal waste, water and cement are mixed.
Further, as the lightweight cement member 4, cement milk in which cement, water and the foam material are mixed, or a material in which reinforcing fiber material is mixed with this cement milk can also be used.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shinichiro Sato 3-15-7 Higashi, Shibuya-ku, Tokyo Inside Kaiser Co., Ltd. (72) Inventor Kazumitsu Tsubonum 3-15-7 Higashi, Shibuya-ku, Tokyo No. Kaiser Co., Ltd. (72) Inventor Isao Minami 1-3-5 Taito, Taito-ku, Tokyo Fudo Kenken Co., Ltd. F-term (reference) 2E162 BA02 CA00 CA11 2E164 CB01 CB11

Claims (11)

[Claims] 1. A precast concrete plate wherein a lightweight cement member is formed on the upper surface of a concrete plate in which truss bars along the long side direction are arranged at appropriate intervals. 2. The precast concrete plate according to claim 1, wherein the lightweight cement member is formed by embracing a truss streak over substantially the entire surface of the concrete plate. 3. The precast concrete plate according to claim 1, wherein the lightweight cement members are formed by holding every other truss bar. 4. The precast concrete plate according to claim 1, wherein the lightweight cement member is formed only in a portion where the truss bars are arranged. 5. The precast concrete plate according to claim 1, wherein the lightweight cement member is formed between truss bars. 6. The precast concrete plate according to claim 1, wherein the lightweight cement member is formed orthogonal to the plurality of truss bars. 7. A precast concrete plate wherein reinforcing ribs are provided on the upper surface of the concrete plate along the long side direction at appropriate intervals, and a lightweight cement member is formed between the reinforcing ribs. 8. The precast concrete plate according to claim 7, wherein the lightweight cement members are formed at appropriate intervals in the longitudinal direction of the reinforcing rib. 9. A lower floor is formed by arranging at least one precast concrete plate of the precast concrete plates of claims 1 to 8 adjacent to each other between beams, and forming a top concrete on the lower floor. A slab characterized by being formed by: 10. A slab characterized by laying a precast concrete plate adjacent to a space between beams to form a lower floor, casting a lightweight cement member on the lower floor, and then casting top concrete. How to build. 11. A structure comprising the slab according to claim 9.