JPH02209559A - Method of constructing waffle slab - Google Patents

Abstract

PURPOSE:To easily remove a mold and obtain a beautiful concrete molded surface by placing concrete in the state where a rectangular trapezoidal mold capable of dividing is covered with a plurality of non-foaming resin sheet moldings. CONSTITUTION:Center blocks 16 and peripheral blocks 17 forming into rectangular trapezoid when collected are formed, respectively. A flat form 3 is supported by a plurality of struts 2. Then, trapezoidal molds formed by collecting the blocks 16, 17 are placed on the form 3 at determined intervals and fixed thereto. The whole trapezoidal mold is covered with a cover piece 18, and after arrangement of reinforcement is conducted between the trapezoidal molds, concrete is placed from the above. Further, after hardening of the concrete, the blocks 16, 17 and the cover piece 18 are removed.

Description

[Detailed description of the invention] (b) Industrial application field This invention relates to the Watsuful slab construction lj method.

More specifically, the present invention relates to the improvement of the trapezoidal shape used when constructing the Watsuful slab.

(b) Conventional technology Watsuful slab is a slab with a structure in which a large number of regularly arranged four-part patterns are arranged at the bottom of the ceiling slab, and when viewed from the ■ζ direction, the rhombic acid looks like a honeycomb. For example, it is used for the ceilings of community center halls and gymnasiums. However, the horizontal cross-sectional shape of one of the four parts is not limited to square or hexagonal, but may also be circular.

Conventionally, the method for constructing such Waffle Slabs was to construct a lightweight table-shaped mold (Waffle Slab 4F5 Construction) made of hard synthetic resin foam (expanded polystyrene, etc.) on a flat plate formwork of plywood X7 board supported by a branch office. Trapezoid type) in large numbers regularly &S! A commonly used method is to place concrete on the concrete layer, and after the concrete has hardened, remove the flat plate formwork and then remove each table-shaped form downward from the concrete layer.

(c) Problems to be Solved by the Invention However, concrete exhibits a strong shrinkage phenomenon during hardening, and the synthetic resin table-shaped mold and cement 1 have a certain degree of adhesion. As a result, the releasability between the concrete layer and the trapezoidal mold surface is poor after the concrete hardens, making it difficult to easily remove the trapezoidal mold, especially at Watsuful slab construction sites where a large number of trapezoidal molds are used. There was a big problem in the workability of the machine. When a large platform mold was used, it was sometimes impossible to remove the mold.

For this reason, it has been proposed to construct a Watsuful slab by coating the molding surface of the trapezoidal mold with a Plus Deck film to improve mold releasability, but this is insufficient for easy demolding. there were.

Regarding this point, the present inventors first used a divisible trapezoidal type, which is a collection of a central block and a plurality of peripheral blocks surrounding the central block, as a 1-note type, to improve concrete hardening. We have discovered a method for constructing a Watsuful slab that allows for easy removal of the tabletop mold later.

Therefore, when such a splittable table-shaped mold is used, demolding is extremely easy, but the structure of the table-shaped mold is
A problem has arisen in which the concrete gets stuck in due to the gaps between the cocks, resulting in the formation of striated protrusions on the surface of the molded concrete.

For this reason, it is conceivable to install a joint material with a wedge-shaped cross section to seal the gaps between the cocks when pouring concrete, but even in this case, marks of the joint material may remain on the concrete forming surface. As a result, it is difficult to obtain a smooth and beautiful concrete molding surface, and the installation of joint material is itself complicated and poses problems in terms of workability.

This invention was made in view of the above situation, and it is possible to easily remove and demold the platform mold from the concrete 1 layer after hardening, and to create a smooth and beautiful concrete 1 layer. - It is an object of the present invention to provide a method for constructing a Watsuful slab that can obtain a molded surface.

(d) Means for Solving the Problems Thus, according to the present invention, concrete is poured from above with a large number of table-shaped molds placed at predetermined intervals on a flat plate formwork, and after the concrete hardens, concrete is layered. It consists of a method of constructing a Watsuful slab by removing a flat plate formwork and then a trapezoidal mold, and the trapezoidal mold is a divisible rectangular trapezoidal mold in which a central block and a plurality of peripheral blocks surrounding the central block are assembled. At the same time, this table-shaped mold is covered with a plurality of non-foamed resin sheet molded products that can collect and cover the entire molding surface of the table-shaped mold on a line different from the collection line of each block. A one-full slab construction method is provided, which is characterized by performing pouring.

The first feature of the present invention is that the rectangular trapezoidal mold, which was conventionally used as an integral structure of synthetic resin foam, is divided into parts, and a specific divided structure is adopted. Such a divided structure is composed of a central block and peripheral blocks. Here, the center block is surrounded by a plurality of peripheral blocks so that its side periphery does not come into contact with concrete when assembled, and forms the central part of the trapezoid. On the other hand, peripheral blocks are composed of multiple blocks.

The shape of each block is not particularly limited as long as a rectangular trapezoid is obtained when assembled. However, normally, as shown in FIG. 1, eight peripheral blocks [one block is combined u1
It is suitable to construct a trapezoidal shape of a truncated quadrangular pyramid as shown in FIG. 2 by a collection of these nine blocks. However, as shown in FIG. 3, a rectangular parallelepiped trapezoid may be formed by a set of nine blocks consisting of a rectangular central block 14 and peripheral blocks 15. In addition, as shown in Figure 4, the shape of each block itself is configured into a truncated quadrangular pyramid,
9 as the center block 16 and peripheral block 17.
It may be configured by aggregating countries.

The center block and peripheral blocks are preferably made of hard synthetic resin foam in terms of strength and weight, and specifically, polystyrene foam, hard polyvinyl chloride foam, hard polyurethane foam, etc. Examples include foams, and polystyrene foams are preferred. However, these molding surfaces may be subjected to mold release treatment as appropriate.

Furthermore, the inside of each block may be a hollow hole, in which case a reinforcing structure such as a rib may be provided in the hollow portion as appropriate.

This invention further provides that when the above-mentioned aggregate block is used as one table-shaped mold for concrete pouring, a plurality of specific resin sheets [molded products] are collected and covered on the molding surface of the table-shaped mold. The second feature is J-ru.

This resin sheet 1-molded product is generally composed of a polystyrene-based, polyolefin-based, or vinyl chloride-based non-foamed sheet, and its thickness is preferably 0.4 to 21 MIP 1 degree. If it is less than the axis, it will easily break, and if it exceeds 2 mm, it will become a river, which is undesirable in terms of workability.Specific examples of such resin sheets include impact-resistant polyethylene sheet, △S resin sheet 1, ABS resin sheet, and polyethylene sheet i.・, Bolibu [1 Examples include pyrene sheet, vinyl chloride sheet, etc.

From the viewpoint of surface finish, especially the smoothness of the surface of the molded concrete, it is preferable to use a polystyrene resin sheet molded product.

The shape of the resin sheet molded product is such that the molding surfaces of the above-mentioned trapezoidal molds can be gathered together to cover the center, and when covered, the gathering line is set at a different position from the gathering line of the blocks. The shape is changed. For example, 1st to 4th
When using a trapezoid shape in which nine blocks are assembled (1) as shown in the figure, it is appropriate to use a quadrant shape in which a cross-shaped assembly line passing through the center point of the trapezoid shape is set when assembled. ing. - of this resin sheet molded product (cover piece 18)
An example is shown in FIG. 6, and FIG. 5 shows a state in which they are assembled to cover a trapezoidal mold. In the figure, 18A to 18D each indicate a resin sheet molded product before assembly. In FIG. This indicates the gathering line of each cook.

When using sheet molded products in which the trapezoidal mold shown in Fig. 5 is butted together at a cross-shaped collection line passing through the center point, each resin sheet molded product must have the same shape. Because it is possible to manufacture molding equipment and molded products.
Culms are preferred because they are simpler. However, when assembled and covered, the edges of each resin sheet molded product 1c may be configured to have a size that overlaps each other or partially overlaps each other.

Furthermore, when assembling the above resin sheet molded products, if each molded product is pasted and joined along the assembly line with adhesive tape, concrete may enter the small gaps between the molded products on the assembly line, and even fine particles may occur. It is more preferable because it can also prevent unevenness and sharp protrusions.

(e) Operation Of the blocks that make up the table-shaped mold, only one surface (upper surface) of the center cock is a molding surface, so it easily separates from the concrete molding surface due to upward force. After the center block III is separated, the center of the trapezoidal mold is open, so that the workability of manually removing the peripheral blocks is greatly improved.

Furthermore, since concrete is poured while the entire molding surface of the trapezoid is covered with the non-foamed resin sheet molding, unnecessary irregularities and linear protrusions are created on the molding surface of the concrete layer. It is possible to construct a Watsuful slab with a smooth and beautiful surface with virtually no formation.

The covered 4g4 @ Sea 1 has good mold releasability from concrete and is made up of multiple divided molded parts, making it easy to cover and remove after concrete is placed. It can be carried out smoothly and is convenient for handling during transportation.

Embodiment As shown in FIG.
Lower side 950m, height 320+nn+: Bulk specific gravity 0.025
~0.033 polystyrene foam) were produced by in-mold molding of expandable polystyrene beads, one of which was used as the center block 1G, and eight of them were combined as the peripheral blocks 17 to form one table-shaped block. Mold (2850X
2850X 320u+m) was constructed. In addition,
The trapezoidal shape in which these blocks are assembled is the trapezoidal shape 1 in Fig. 4.
It corresponds to 0.

On the other hand, by subjecting a polystyrene sheet to vacuum forming, a cover piece 18 with a square top surface as shown in FIG. height 320
An, thickness 1.5M) were produced in large numbers.

First, as shown in FIG. 9, a flat plate formwork 3 made of plywood is supported by a plurality of supports 2, and the
A trapezoidal type 1C, which is a collection of blocks (center block and peripheral blocks) shown in Figure M4, was placed at predetermined intervals for fa purchase. J for vibration during reinforcing work and concrete pouring
The periphery of the pedestal mold 1C was fixed to prevent it from moving. Note that the fixing may be performed by applying a general vinyl acetate resin adhesive to the mounting portion.

Next, each of the trapezoidal molds is covered with four cover pieces 18, and the collection line X is formed.

Y was adhered with a transparent adhesive sheet 119 as shown in FIG. As a result, the molding surface of the trapezoid mold was covered with a polystyrene sheet.

In this state, reinforcing bars were placed between the platform molds, and concrete 1 was poured from above.

After the concrete hardened, the pillars 2 and the flat formwork 3 were removed. This state is shown in FIG. 4 in the figure indicates a hardened concrete layer.

Here, the center block 16 having a trapezoidal shape was very easily detached by applying downward force by hand. Next, the four peripheral blocks constituting the side portion were easily detached by pulling them toward the detachment space side of the center block. The four peripheral blocks forming the remaining corners were easily detached by pulling toward the center.

Furthermore, 1'j on concrete 1/molding surface! The covered cover piece 18 was easily removed by pulling it outward by hand. And, on the molding surface of the obtained Watsuful slab, a trapezoidal mold is used. No irregularities or striated protrusions due to the gaps between the blocks forming i4 were observed, and the surface of i4 was extremely smooth and beautifully curved.

On the other hand, when polystyrene sheet molded products are used to cover individual blocks, large linear protrusions occur on the molded surface of the Watsuful slab due to the gaps between each block, and it is difficult to remove them. It took a considerable amount of time. Furthermore, after fitting a long joint material with a T-shaped cross section into this gap and sealing it with tape, concrete was poured, but traces of the joint material itself appeared on the molded surface, making it easier to create a smooth-surfaced Watsuful slab. could not be built.

(g) Effects of the Invention According to the method for constructing a Watsuful slab of the present invention, demolding of a trapezoidal mold after concrete hardening can be performed extremely easily and smoothly, and a Watsuful slab with a smooth and beautiful surface can be easily obtained. Can be done. Therefore, it is possible to falsely improve workability when horizontally building a large number of Watsuful slabs or large Watsuful slabs.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a divided state of a trapezoid type according to an embodiment of the present invention, FIG. 2 is a perspective view showing the assembled state, and FIGS. FIG. 5 is a perspective view illustrating the state of collection of the trapezoid mold in the droplet example, FIG. Resin Seat 1 - A perspective view illustrating a molded product, FIG. 7 shows the trapezoidal mold shown in FIG.
FIG. 8 is a perspective view showing a cover state of a platform by a non-foamed resin sheet molded product in an embodiment, and FIG. FIG. 10 is an explanatory view showing the state in which the shaped mold is placed, and is a second clear view showing the state of molding using the trapezoidal mold. IA, 1B, IC... Trap type, 2...
Branch office, 3...Flat plate formwork, 4...Concrete 1-layer, 11.14.16...Center block, 12...Corner block , 13... Side block, 15.17... Surrounding block, 18.18A,
18B, 18C, 18D...Resin sheet molded product cover), 19...Adhesive tape, 20...Reinforcement frame, 21...Rib, X,
Y...Gathering line. Fallen Zu Zu Tsutsu Zu Zu Kan Senji Zuzu Zu No. 10

Claims (1)

[Claims] (1) Concrete is poured from above with a number of table-shaped molds placed at predetermined intervals on a flat plate form, and after the concrete has hardened, the flat plate form and then the table-shaped molds are removed from the concrete layer to form a waffle slab. As the trapezoidal mold, a divisible rectangular trapezoidal mold in which a central block and a plurality of peripheral blocks surrounding the central block are assembled is used, and this trapezoidal mold is used as the trapezoidal mold. A waffle slab construction method characterized in that concrete is poured while the entire molded surface of the block is covered with a plurality of non-foamed resin sheet molded products that can be collected and covered on a line different from the collection line of each block. .