JPH1034630A - Manufacturing of hollow precast floor board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for economically manufacturing a hollow precast floor board without an increase in its weight by saving a material and manual labor. SOLUTION: Plural ribs 2 are provided projecting on the upper face of a precast plate 1 and at the same time, a lightweight block 3 is installed on the lateral face of each of the ribs 2 to manufacture a precast flooring 1 with reverse ribs 2. In addition, a molding frame plate 6 arranged between the ribs 2 is supported with the upper face of the light weight block 3 installed on the lateral face of each of the ribs 2, and an on-site concrete 5 is formed on the upper face of the molding frame plate 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a hollow precast slab, in which a part is made of precast concrete and the remaining part is made of cast-in-place concrete.

[0002]

2. Description of the Related Art In order to reduce the weight of a member, a precast slab in which a part is hollow or filled with a lightweight member has been manufactured.

<A> In the manufacture, for example, as shown in FIG. 6, a block c of styrofoam is arranged on a precast concrete b slab having a rib a protruding therebetween, and a concrete d is struck thereon. It is done by the method of setting. According to this method, a large-capacity styrofoam block c is required, which is extremely uneconomical. Further, the worker needs to handle the large block c, and the work is not easy.

<B> Alternatively, as shown in FIG. 7, a rib a
Are arranged by sandwiching veneer boxes e, and concrete d is poured from above. According to this method, a large number of veneer boxes e are installed between the ribs a.
Is required, which is uneconomical.

<C> Alternatively, as shown in FIG.
The veneer plate f is suspended over the rib a of the precast concrete slab b projecting from above, and the concrete d is poured from above. In this method, the rib a
In order to receive the edge of the veneer plate f, the width of the rib a needs to be increased, and the overall weight increases. Further, it is necessary to form a notch g on the upper surface of the rib a so that the veneer plate f does not come off from the upper surface of the rib a, and it takes time to form the notch g.

<D> In order to integrate the precast rib a and the cast-in-place concrete d, there is a structure in which a reinforcing bar h projects from the upper surface of the rib a as shown in FIG. In this structure, the number of steps for arranging the reinforcing bars increases, and the material cost also increases, so that the price of the product is high.

<E> In order to integrate the precast rib a with the concrete cast in place, a structure in which irregularities i are formed on the upper surface of the rib a using a roller or the like as shown in FIG. is there. In this structure, the work of forming the irregularities i using a wire mesh roller or the like is troublesome, which is also uneconomical.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and the hollow precast floor can be manufactured economically without increasing the weight by omitting materials and labor. It is intended to provide a method for producing a plate.

[0009]

In order to achieve the above object, a method of manufacturing a hollow precast slab according to the present invention comprises the steps of: projecting a plurality of ribs on an upper surface of a precast plate; A lightweight member is installed on the plate, and a precast plate with reverse ribs is manufactured.The upper surface of the lightweight member installed on the side of the rib supports a formwork plate arranged between the ribs. And do
It features a method of manufacturing a hollow precast slab.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

<A> Precast concrete plate. The floor slab of the present invention is a method of manufacturing by combining a precast concrete slab and a cast-in-place concrete slab. For this purpose, a precast concrete slab A having a plurality of ribs 2 projecting at regular intervals on the upper surface of a precast plate 1.
To manufacture. The precast concrete plate 1 is a normal concrete plate in which no prestress is introduced. Therefore, the operation and the members for introducing the prestress are unnecessary, and the product is economical.

<B> Arrangement of lightweight members. A rib 2 is provided on the concrete plate 1 so as to project upward. When forming the rib 2, a block 3 of a lightweight member is installed at a position corresponding to a part of the outside of the rib 2. The holding member of the link mechanism is arranged outside the light member block 3, and concrete is cast between the light member blocks 3. After the concrete is hardened, the distance between the pressing members is reduced by pulling up the link outside the block 3, and the pressing member and the block 3 are separated. As a result, a group of ribs 2 having blocks 3 of lightweight members attached to both sides is completed, and a precast plate A with reverse ribs can be manufactured. It is to be noted that the same configuration can be made even when the precast concrete plate is turned upside down and the concrete is cast from above with the ribs on the lower side.

<C> Interval of Lightweight Member Block 3 The lightweight member block 3 is made of, for example, styrofoam,
Alternatively, a block made of strong cardboard is used. The block 3 of the lightweight member is attached to the lower side surface of the rib 2 instead of filling the entire space between the ribs 2. Therefore, there is a sufficient space between the block 3 of one lightweight member and the block 3 of the adjacent lightweight member.

<D> Unevenness of rib 2 The block 3 of the lightweight member is not disposed over the entire height of the rib 2, but the upper half of the rib 2 is exposed as it is. This exposed portion is formed not as a plane but as an uneven wall surface 4. In this embodiment, the uneven wall surface 4 has a shape in which a vertical wall surface enters and exits. However, the present invention is not limited to this shape. Rib 2
Other shapes can also be adopted as long as the adhesion strength between them can be increased.

<E> Support of the form plate. The cast-in-place concrete 5 is cast on the upper surface of the precast plate A with ribs formed as described above. For that purpose, the form plate 6 is bridged between the ribs 2. As the form plate 6, for example, a plate made of a lightweight and strong material such as a veneer plate is used. However, instead of directly bridging between the upper surfaces of the ribs 2, the light-weight members 3 are disposed on the side surfaces of the ribs 2. That is, the form plate 6 disposed between the ribs 2 is supported by the light-weight member block 3 on the side surface of one rib 2 and the light-weight member block 3 on the adjacent rib 2 side surface. By the arrangement of the form plate 6, a space as a hollow portion 7 surrounded by the blocks 3 of the lightweight members on both sides and the form plate 6 is formed.

<F> Casting of cast-in-place concrete 5 The cast-in-place concrete 5 is cast on the upper surface of the form plate 6. Then, the concrete 5 can be formed in a state surrounding the upper part of the rib 2. In this case, since the cast-in-place concrete 5 cannot be cast in the space surrounded by the light-weight member block 3 and the form plate 6, the concrete plate that remains as the hollow portion 7 can be formed.

[0017]

[Effects of the present invention] Since the method for producing a hollow precast slab of the present invention is as described above, the following effects can be obtained. <B> Lightweight block 3 such as styrofoam
And a method of forming a hollow portion 7 by a form plate 6 supported by the block 3 of the lightweight member. Such an inexpensive combination of materials can be economically manufactured. <B> The work is easy because it is a combination of inexpensive materials and lightweight members. Further, the block 3 of the lightweight member forming the hollow portion 7 is not filled in the entire volume of the hollow portion 7, but a part of the form plate 6
It is only used as a support material. Therefore, it can be constituted by small blocks, and handling is extremely easy. <C> When forming the rib 2 on the precast plate 1,
The block 3 of the lightweight member can also serve as a mold for forming the rib 2. Therefore, most of the molds for the ribs 2 can be omitted during precast molding, which is economical. <D> An uneven wall surface 4 is formed on the rib 2. Therefore, it is possible to achieve strong integration between the cast-in-place concrete 5 and the precast plate A with ribs. <E> In order to achieve a strong integration between the cast-in-place concrete and the precast concrete, it is not necessary to roughen the concrete upper surface and provide irregularities or arrange reinforcing bars as in the past, so the work required for the work is greatly reduced. Can be reduced. <F> Due to the uneven wall surfaces 4 of the ribs 2, it is possible to sufficiently attach the blocks 3 of the lightweight members as the supporting members and the molds arranged on both sides thereof. <G> The precast plate 1 of the present invention does not introduce prestress. The reason is that the introduction of pre-stress cannot avoid the occurrence of deflection in the center.
That is, even if the prestress is introduced, it is inevitable that the precast plate 1 bends until the concrete is cast on the upper part and the two are integrated, and the central part is supported from below to prevent it. That is the current situation. In such a situation, the advantages cannot be said to be effectively utilized for the trouble of introducing the prestress and the cost of the members. In this regard, since no prestress is introduced in the precast plate 1 of the present invention, useless labor and use of members can be avoided, and an inexpensive product can be manufactured.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of a precast slab manufactured by a manufacturing method of the present invention.

FIG. 2 is an explanatory view of an embodiment of a method for producing a hollow precast slab.

FIG. 3 is an explanatory view of an embodiment of a method for producing a hollow precast slab.

FIG. 4 is an explanatory view of an embodiment of a method for producing a hollow precast slab.

FIG. 5 is an explanatory view of an embodiment of a method for producing a hollow precast slab.

FIG. 6 is an explanatory view of an embodiment of a conventional method for producing a hollow precast slab.

FIG. 7 is an explanatory view of an embodiment of a method for producing a conventional hollow precast slab.

FIG. 8 is an explanatory view of an embodiment of a conventional method for producing a hollow precast slab.

FIG. 9 is an explanatory view of an embodiment of a method for producing a conventional hollow precast slab.

FIG. 10 is an explanatory view of an embodiment of a conventional method for producing a hollow precast slab.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Taizo Yoshida 1-7-1, Maizuru-cho, Oita-shi, Oita Pref. Sato Gumi (72) Inventor Tomoyuki Kajimura 1-7-1, Maizuru-cho, Oita-shi, Oita Sato Guminai Co., Ltd. (72) Inventor Naofumi Kihara 1-7-1, Maizuru-cho, Oita City, Oita Prefecture Stock Company Sato Guminai (72) Inventor Shoji 1-7-1, Maizuru-cho, Oita City, Oita Prefecture Stock (72) Inventor Keiji Eto 1-7-1, Maizuru-cho, Oita City, Oita Prefecture Stock Company (72) Inventor Shuteru Yamamoto 2-6-1 Mitsumachi, Higashi-ku, Hiroshima, Hiroshima, Japan Inside the East Industry Co., Ltd. (72) Inventor Takeshi Kobayakawa 2-6-131 Hikari-ku, Higashi-ku, Hiroshima City, Hiroshima Prefecture Inside the East Industry Co., Ltd. (72) Takashi Yamane 2-6-1, Mitsumachi, Higashi-ku, Hiroshima City, Hiroshima Prefecture Within Far East Kogyo Co., Ltd. (72) Inventor Akinori Morie 2-6-1, Hikari-ku, Higashi-ku, Hiroshima-shi, Hiroshima Prefecture Within Far East Kogyo Co., Ltd. No. 31 Kyokuto Kogyo Co., Ltd. (72) Inventor Hideyuki 2-6-1 Hikari-ku, Higashi-ku, Hiroshima City, Hiroshima Prefecture No. 31 Kyokuto Kogyo Co., Ltd. (72) Takayuki Naito 2-chome Mitsumachi, Higashi-ku, Hiroshima Hiroshima Prefecture 6-31 Kyokuto Kogyo Co., Ltd.

Claims (3)

[Claims] A plurality of ribs protrude from an upper surface of a precast plate, and a lightweight member is provided on a side surface of the rib to manufacture a precast plate with reverse ribs. A method of manufacturing a hollow precast slab, in which a top plate supports a form plate arranged between ribs, and concrete is cast on the top surface of the form plate. 2. A precast plate with a reverse rib having a plurality of ribs is manufactured by casting concrete with the lightweight member as a mold, and the lightweight member on the side of the rib is left installed. A method of manufacturing a hollow precast slab, in which a form plate arranged between ribs is supported by an upper surface of a lightweight member, and concrete is cast on the upper surface of the form plate. 3. A plurality of ribs protruding from an upper surface of a precast plate, irregularities are formed on an upper portion of a side surface of the rib, and a lightweight member is installed on a lower portion of a side surface of the rib, and a precast with a reverse rib Production of hollow precast slabs by manufacturing a board, supporting the form plate placed between the ribs by the upper surface of the lightweight member installed on the side of the rib, and casting concrete on the upper surface of the form plate Method