JP2003321894A - Planar grid-patterned hollow concrete slab and retaining fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a planarly grid-patterned hollow concrete slab which is excellent in workability and exhibits high sound insulating properties, and to provide a retaining fixture for use for the slab. <P>SOLUTION: The planarly grid-patterned hollow concrete slab is formed by embedding lightweight bodies in small spaces 4 which are defined like a grid by top reinforcements 3a, 3b and bottom reinforcements 2a, 2b arranged in the slab like the grid. According to the hollow concrete slab, the lightweight body is a solid or a hollow lightweight sphere 5 having a diameter that can pass through a top face of the small space 4 but cannot pass through a side surface of the same, and fixed to a predetermined location by the retaining fixture arranged from above the top reinforcements. The retaining fixture is formed of at least two auxiliary reinforcements arranged in parallel with each other between the mutually adjacent top reinforcements, and a plurality of units fixed to the auxiliary reinforcements in a manner facing downward. The unit is installed in each small space defined by the lengthwise and breadthwise arranged top reinforcements, to thereby fix the lightweight sphere to the predetermined location in the small space. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat-grid hollow concrete slab having excellent workability and exhibiting high sound insulation, and a retainer used for the same.

[0002]

2. Description of the Related Art A reinforced concrete slab is made thicker by increasing its thickness to increase the building's height and secure a large living room space. Various construction methods have been put into practical use. As such a buried object, a hollow tube typified by a winding pipe, a box-shaped processed product obtained by bending a keystone plate, a water-resistant corrugated cardboard, or the like is used.
Further, a method of using a mold in which a synthetic resin foam-molded article is embedded and fixedly integrated with a thin-walled PC floorboard is disclosed in Japanese Patent Publication No. 57-4.
7007, Japanese Patent Publication No. 58-20768, etc.

Although these conventional methods can achieve the purpose of weight reduction, most of them are unidirectional slabs in which the hollow portions are continuous only in one direction. It has been pointed out that such a unidirectional slab is structurally designed to transmit a load in one direction, and therefore, in the case of a slab supported by four sides, there are various design restrictions. As a solution to this problem, a bidirectional slab has been proposed in Japanese Examined Patent Publication No. 63-49025. However, a two-way hollow slab that uses a hollow tube requires a great deal of work to design because the hollow tubes are allocated to each property or slab, and since various sizes of hollow tubes are required, material management is difficult. There are various problems such as being complicated and requiring a lot of work for construction.

As a method for drastically improving the conventional hollow slab construction method, Japanese Patent Application Laid-Open No. 9-250196 discloses that the upper and lower end ribs are arranged in a grid pattern in a form and are partitioned in a grid pattern. A method of placing a large number of lightweight bodies in a small space and placing concrete has been proposed. In this bidirectional slab construction method, a lightweight body such as a dice-shaped, columnar or lantern-shaped plastic foam is used as a lightweight body, and the lightweight body is embedded in the small space regularly formed in a grid pattern of a slab, The bidirectional slab has a cross-sectional shape in which I-shaped beams are connected in two orthogonal directions. With such a structure, material management becomes easy, and construction can be achieved by embedding a lightweight body in the space and supporting it with auxiliary muscles.
It has become possible to easily form a highly accurate bidirectional slab.

However, the bidirectional slab described in the above publication has the following problems. In order to form the slab skeleton A shown in FIG. 13, first, auxiliary muscles 24a are arranged in the middle of the lower end muscles 22a, auxiliary muscles 24b are arranged in the middle of the lower end muscles 22a, and then the upper end muscles are arranged. After arranging 23a and 23b and installing the lightweight body 25, the upper end muscles 23a and 23
It was necessary to arrange the auxiliary muscle 24c in the middle of b. This is because the bottom portion of the lightweight body 25 is fixed by the auxiliary muscles 24a and 24b, and the top portion of the lightweight body 25 is fixed by the auxiliary muscles 24c, so that the light weight body 25 is prevented from rising during concrete pouring. The auxiliary muscle itself does not contribute much to the strength improvement of the slab. Further, since the groove for receiving the auxiliary muscle is formed in the lightweight body, the vertical direction and the horizontal direction of the lightweight body are generated, and it is necessary to accurately arrange the lightweight body in accordance with this directionality during the construction. Therefore, the cost of arranging the auxiliary muscles is high, and it takes a lot of time to install the lightweight body, resulting in an increase in the construction cost.

[0006]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the problems of the conventional bidirectional slab, to provide excellent workability and to provide high sound insulation, and to provide a flat lattice hollow concrete slab, and It is to provide a metal holder to be used.

[0007]

SUMMARY OF THE INVENTION That is, the present invention is a plane grid in which a lightweight body is embedded in a small space partitioned in a grid pattern by upper and lower end bars arranged in a grid in a slab. In the hollow concrete slab, the lightweight body is a solid or hollow lightweight sphere, has a diameter that can pass through the top surface of the small space but not through the side surface, and is a retainer placed from above the upper end bar. A flat lattice hollow concrete slab characterized in that a lightweight body is fixed in place. In the flat lattice hollow concrete slab of the present invention, the volume ratio of the lightweight spheres to the small space is 10 to 50%.
Be good.

Further, the present invention comprises at least two auxiliary muscles arranged in parallel between adjacent upper muscles and a plurality of units fixed downward to the auxiliary muscles, and the units are in a lattice shape. A presser metal object for a flat lattice hollow concrete slab, characterized in that the lightweight spherical body is inserted into a small space formed by the upper end bar arranged in the small space and is fixed to a predetermined position of the small space. In the pressing metal object of the present invention,
The unit is a saddle-shaped endless frame reinforcement, and preferably its legs are each outwardly bent. Further, in the unit, the sandwiching muscles that are bent so as to form a valley are arranged so as to be alternately inclined,
The end of the pinching muscle is not connected.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The flat lattice hollow concrete slab of the present invention (hereinafter referred to as "concrete slab")
Embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to these embodiments, and includes replacement of elements and design changes within the scope of achieving the object of the present invention.

FIG. 1 is a plan view showing an example of a slab skeleton of a concrete slab, FIG. 2 is a vertical sectional view taken along the line AA ', and FIG. 3 is a vertical sectional view taken along the line BB'.
FIG. 4 is a perspective view showing the concrete in a cutout state.

The slab skeleton indicated by the reference symbol S is arranged on the lower formwork 1 of the slab and has lower end muscles 2a and 2a arranged in parallel.
A lower end bar 2b arranged orthogonally to the upper end and upper end bars 3a and 3b arranged in the same manner, and a small space 4 partitioned in a grid pattern is formed by these, and a large number of small bars are formed. A lightweight sphere 5 is arranged in each of the spaces 4. Upper streak 3b
A pressing metal 6 is arranged from above to prevent the lightweight sphere 5 from moving. The lower end streak 2b and the upper end streak 3b are appropriately fixed by a purse stop bar 7.

As the lower formwork 1, a formwork made of wood, plastic or the like is used, but instead of this, a deck construction method using a deck plate may be used, or a half PC construction method or a full PC construction method using a precast concrete board. May be

The spacing of the main reinforcements (the spacing between 2a and the adjacent 2a in the lower reinforcement, the spacing between 2b and the next 2b, the spacing between 3a and the next 3a in the upper reinforcement, 3b and the next 3b). It is preferable to change the distance between the two according to the design thickness of the concrete slab. This is because changing the size of the lightweight sphere 5 according to the slab thickness is advantageous for reducing the weight and improving the sound insulation while maintaining the slab rigidity.
The distance between the lower end streak 2a and the upper end streak 3a may be determined from the slab thickness and the concrete cover thickness.

There are no particular restrictions on the purse streak 7 as long as it can fix the upper end streak and the lower end streak, but it is 10 to 15 mmφ.
It is preferable that a certain amount of reinforcing reinforcing bar is cut into a predetermined length, and one end thereof is bent at an acute angle and the other end is bent at a substantially right angle. In addition, it is also possible to use a reinforcing steel bar cut to a predetermined length and fix the reinforcing steel bar to the upper end bar and the lower end bar by a fixing means such as welding, bonding, or binding, which is included in the present invention.

The lightweight sphere 5 used in the concrete slab of the present invention has a diameter that allows the top surface of the small space 4 to pass through but not the side surface thereof. If the diameter (φ) of the lightweight sphere 5 is the same as or smaller than the side surface of the small space 4, there is a possibility that it may pass through the side surface and stick out or move to another small space. Further, unless φ is smaller than the size that allows the top surface of the small space to pass, the small space 4 cannot be arranged. In this way, by defining the size of the lightweight sphere 5 with respect to the small space 4, only one lightweight sphere can fit in one small space.

If this condition is satisfied, normally S
(Φ125 mm), M (φ150 mm), L (φ175 m)
m), 2L (φ200mm), 3L (φ225mm), 4L
It is sufficient to prepare about 6 types of (φ250 mm), which can correspond to a slab thickness of 225 mm to 350 mm, but it is possible to correspond to an arbitrary slab thickness by using a lightweight sphere having an arbitrary diameter.

The shape of the lightweight sphere should be as spherical as possible. Although it may be somewhat distorted, an elliptic sphere such as a rugby ball or an oval shape has directionality, and therefore it becomes necessary to align the directions during construction. If unevenness is provided on the surface of the lightweight sphere or a shallow groove is cut, it becomes better compatible with concrete. The material of the lightweight sphere is not particularly limited as long as it is lightweight and easy to process, and examples thereof include a plastic foam and a plastic hollow body. In particular,
A solid body made of plastic foam such as styrene foam and polyethylene foam, which is lightweight and rigid, is suitable.

In the present invention, since the light-weight spheres having no directionality are used, the light-weight spheres 5 can be dropped into one small space.
Can be placed correctly one by one. On the other hand, if a conventional directional lightweight body is used, it is necessary to align the directions one by one, resulting in extremely low construction efficiency.

In the present invention, the ratio (volume ratio) of the lightweight spheres to the small space is preferably about 10 to 50%. If the volume ratio is less than 10%, the weight of the concrete slab will not be reduced and the sound insulation will not be improved so much, and if it exceeds 50%, the rigidity of the concrete slab will be reduced. From the balance of rigidity and weight saving of concrete slab, preferably 15
~ 35%, more preferably 18-32%. Table 1
The preferred examples of the slab thickness, the cross-sectional gap (the gap between the lower end streak 2a and the upper end streak 3a), the void diameter, and the volume ratio are shown in, but the present invention is not limited thereto.

[0020]

[Table 1]

After arranging the light-weight spheres 5 in a large number of small spaces 4, a pressing metal 6 is placed on the upper end streak 3b and is bound with the upper end streak 3a. Only by arranging in the small space 4, there is a possibility that the lightweight spheres 5 may float during pouring of the ready-mixed concrete and may escape from the small space 4 to gather on the surface of the slab or be displaced from a predetermined position. The present invention solves this by fixing the lightweight sphere 5 with the presser metal 6. This retainer 6 can also be used as a scaffolding for construction work such as piping work and wiring work, and has an advantage that the lightweight sphere can be prevented from being damaged.

Next, a concrete example of the pressing metal for concrete slab of the present invention will be described with reference to the drawings. 5, 6 and 7 are perspective views showing an example of a pressing metal object,
FIGS. 8A and 8B are a plan view and a front view, FIG. 8 is a plan view of a unit constituting the presser piece, FIG. 9 is a vertical sectional view taken along the line AA ′, and FIG. 10 is a vertical sectional view taken along the line BB ′. Is.

The holding metal 11 has two auxiliary muscles 12, 1
2'and a plurality of units 1 fixed downwardly to the 2 '
3, 13 ', 13 ", 13"', 13 "" ...
The unit 13 shown in FIG. 5 has an endless frame shape in FIG. 8, a mountain shape like Mt. Fuji in FIG. 9, and a box shape without a top in FIG. 10 and straddles the auxiliary muscles 12 and 12 ′ in a saddle shape. It is stuck in the closed state. The unit 13 can be loaded into the small space shown in FIG. 1, the lightweight sphere 14 is housed in the space formed by the unit 13, and the lightweight sphere 14 is fixed so as not to move. As shown, two auxiliary muscles are sufficient, but three or more auxiliary muscles may be used. In the case where there is only one auxiliary bar, the pressing metal rotates about this as a rotation axis, so it is necessary to fix the auxiliary bar and the upper end bar by welding or the like. Although the thickness and the length of the auxiliary bar 12 are arbitrary, for example, if a 6 mmφ rebar is used and the total length is about 1.9 m, it is easy to handle and the design and construction are easy.

The unit 13 can be manufactured, for example, by bending a reinforcing bar into a rectangular shape, welding the ends to each other to form a rectangular frame reinforcing bar, and bending this into a predetermined shape. Next, the unit 13 is placed on the two auxiliary muscles 12 and 12 'so that the bending side of the unit 13 faces downward, and the intersections are welded to each other, whereby the pressing metal member 11 in which the both are fixed can be manufactured. In the above-described embodiment, the example of the configuration in which the leg portion 15 of the unit 13 is bent outward is shown. However, as shown in FIG. 11, the leg 15a is a presser member 11a using the unit 13a in which the leg portion 15a is not bent. May belong to the present invention. The presser metal 11 having the legs 15 bent outward is easy to load into a small space, has good compatibility with lightweight spheres, and has an advantage of being easily stacked during storage or transportation.

Next, another example of the pressing metal piece will be described with reference to the drawings. FIG. 12 is a perspective view showing another example of the pressing metal object. The retainer 16 is a unit 18 fixed in place of the unit 13 of the retainer 11 of FIG. The unit 18 is composed of sandwiching muscles 19 bent so as to form a valley, and the units 18 are arranged so as to be alternately inclined to the auxiliary muscles 17 and 17 ′. In addition, in this embodiment, the configuration example having the bent leg portion 20 is shown, but the leg portion may not be bent.

The pressing metal object for concrete slabs of the present invention is not limited to the above embodiment, and various design changes can be added. It should be noted that although a wire mesh, a metal lath, or other mesh reinforcement is conceivable as the pressing metal, the mesh reinforcement could not function as a pressing metal because the lightweight sphere moved in a violent flow during concrete pouring.

A preferred embodiment of the concrete slab of the present invention is a small room type concrete slab in which the number of small spaces 4 is increased and smaller light-weight spheres 5 are arranged. This small room type concrete slab is superior in sound insulation to the conventional flat lattice hollow concrete slab (utility model registration No. 3082676). In order to increase the number of small rooms, it is sufficient to narrow the vertical and horizontal main bar intervals, and to narrow the cross section gap between the lower end bar 2a and the upper end bar 3a accordingly (see Table 1). The number of rooms in the small space can be further increased, but the construction cost also increases, so it is preferable to decide the number of rooms from the viewpoint of cost effectiveness.

The concrete slab of the present invention can be constructed by placing concrete in a mold having the slab skeleton, and after curing, demolding. This plane lattice concrete slab may be installed on site to produce the slab skeleton on site, or may be a half PC construction method or a full PC construction method using a precast concrete plate.

[0029]

EFFECTS OF THE INVENTION In the flat lattice hollow concrete slab of the present invention, since the lightweight body placed in a small space is a sphere, it is not necessary to align the directions of the lightweight body during construction. Also,
By using the pressing metal object of the present invention, it was extremely easy to fix the lightweight sphere at a predetermined position, and the slab strength and sound insulation performance as designed could be exhibited. In addition, by narrowing the spacing between the bottom and top muscles and arranging smaller lightweight spheres, the balance between weight reduction and rigidity is excellent, and sound propagation is achieved by the large number of small spaces and the lightweight bodies placed in them. It is recognized that the sound is disturbed and the sound in a certain wavelength range is attenuated, and in particular, the floor impact sound, which is a problem in multi-dwelling houses, hotels, schools, warehouses, multi-storey parking lots, etc., can be significantly improved.

[Brief description of drawings]

FIG. 1 is a slab skeleton of the concrete slab of the present invention.
It is a top view which shows an example.

FIG. 2 is a vertical sectional view taken along the line AA ′ of FIG.

FIG. 3 is a vertical sectional view taken along the line BB ′ of FIG.

FIG. 4 is a perspective view showing the concrete of FIG. 1 in a cutout state.

FIG. 5 is a perspective view showing an example of a pressing metal object.

FIG. 6 is a plan view of a holding metal object.

FIG. 7 is a front view of a holding metal object.

FIG. 8 is a plan view of a unit that constitutes a holding metal object.

9 is a vertical sectional view taken along the line AA ′ in FIG.

10 is a vertical cross-sectional view taken along the line BB ′ of FIG.

FIG. 11 is a perspective view showing another example of a pressing metal object.

FIG. 12 is a perspective view showing another example of a pressing metal object.

FIG. 13 is a view showing a skeleton of a conventional plane lattice hollow concrete slab.

[Explanation of symbols]

S: Slab skeleton 1: Lower formwork 2a, 2b: Bottom muscle 3a, 3b: Upper streak 4: Small space 5,14: Lightweight sphere 6,11,16: Pressing hardware 7: Purse 12, 17: Auxiliary muscle 13, 18: Unit 15, 20: Leg

   ─────────────────────────────────────────────────── ─── Continued front page    (71) Applicant 591280197             Structural Planning Institute Co., Ltd.             4-38-13 Hommachi, Nakano-ku, Tokyo (72) Inventor Kenji Inoue             6-16-4 Nishikasai Stock Exchange, Edogawa-ku, Tokyo             Inside the company gate (72) Inventor Hisao Iguchi             6-16-4 Nishikasai Stock Exchange, Edogawa-ku, Tokyo             Inside the company gate (72) Inventor Takayuki Ueda             6-16-4 Nishikasai Stock Exchange, Edogawa-ku, Tokyo             Inside the company gate (72) Inventor Takao Doi             6-16-4 Nishikasai Stock Exchange, Edogawa-ku, Tokyo             Inside the company gate (72) Inventor Akinobu Nakazawa             3-17-13 Aobadai, Meguro-ku, Tokyo             Orimoto Takumi Structural Design Laboratory (72) Inventor Koetsu Nakamura             3-17-13 Aobadai, Meguro-ku, Tokyo             Orimoto Takumi Structural Design Laboratory (72) Inventor Akihisa Okuda             3-17-13 Aobadai, Meguro-ku, Tokyo             Orimoto Takumi Structural Design Laboratory (72) Inventor Noriyasu Ejiri             4-28-28 Takadanobaba limited association, Shinjuku-ku, Tokyo             In the company Ejiri architectural structure design office (72) Inventor Tetsuya Tanaka             4-28-28 Takadanobaba limited association, Shinjuku-ku, Tokyo             In the company Ejiri architectural structure design office (72) Inventor Yuto Usami             4-5-3 Chuo, Nakano-ku, Tokyo             Zoukei Institute (72) Inventor Yasushi Fujimata             4-5-3 Chuo, Nakano-ku, Tokyo             Zoukei Institute

Claims (6)

[Claims] 1. A flat lattice hollow concrete slab in which a lightweight body is embedded in a small space partitioned in a grid pattern by upper end bars and lower end bars arranged in a grid in a slab, wherein the lightweight body is It is a solid or hollow lightweight sphere, has a diameter that can pass through the top surface of the small space but not through the side surface, and the lightweight body is fixed at a predetermined position by a metal holder placed from above the upper end streak. A flat lattice hollow concrete slab characterized by the following. 2. The volume ratio of the lightweight spheres to the small space is 10.
The flat lattice hollow concrete slab according to claim 1, which is -50%. 3. An at least two auxiliary muscles arranged in parallel between adjacent upper muscles and a plurality of units fixed downward to the auxiliary muscles, the units being arranged in a lattice pattern. A holding metal object for a flat lattice hollow concrete slab, which is inserted into a small space formed by an upper end streak so as to fix a lightweight sphere at a predetermined position in the small space. 4. The retainer metal for a flat lattice hollow concrete slab according to claim 3, wherein the unit is an endless frame bar bent in a saddle shape. 5. The retainer for a flat lattice hollow concrete slab according to claim 4, wherein the legs of the unit are each bent outward. 6. The flat lattice hollow concrete slab according to claim 3, wherein the unit has the sandwiching bars bent so as to form a valley and arranged so as to be alternately inclined, and the ends of the sandwiching bars are not connected. A metal fitting.