KR100814442B1 - Concrete mold for flat plate slab/flat slab and construction method using the same - Google Patents

Abstract

A form for a flat slab and a flat slab construction method using a form for a flat slab are provided to apply to construction of various flat slabs regardless of structural design to exclude the use of a lower support such as timbering, to make installation and dismantlement easy, to prevent the generation of waste materials and to recycle a form for a flat slab continuously. A form for a flat slab includes a rectangular plate(10) having the flat plane assembled with other plates to form a form assembly body for a flat slab and provided with an opening to penetrate a column of a building, plural first through holes(24) to penetrate hanging rods and plural insertion holes(34) to penetrate fastening bolts(32), plural rib members(12) attached to the bottom of the plate to prevent the form for a flat slab from being bent or broken in installation and construction, plural reinforcement frames(16) installed and supported to the lower part of the rib members and provided with plural fastening holes to couple two forms for a flat slab with coupling bolts and nuts and plural second through holes(26) to penetrate hanging rods, and plural laying sleeves(28) installed to the top of the plate in a vertical direction to make the bottom fixed to the top of the plate and the top extended to the upper part. A flat slab construction method using a form for a flat slab comprises the steps of: forming a column structure by installing forms for a flat slab having openings to face each other on a part where a column of a building is to be constructed and installing rectangular forms for a flat slab between the forms for a flat slab, and assembling the forms using connecting bolts and nuts; hanging the form assembly on a horizontal support beam installed between column structures; putting and coupling the edge of a plate form on the upper edge of the form for a flat slab; pouring concrete on the form for a flat slab and the plate form and curing the concrete; and stripping off the form assembly for a flat slab and descending, and constructing a flat slab for the lower story continuously.

Description

Concrete mold for flat plate slab / flat slab and construction method using the same}

The present invention will be described in detail with reference to the following drawings, but these drawings illustrate preferred embodiments of the present invention, and the technical concept of the present invention is not limited to the drawings and should not be interpreted.

1 is a cross-sectional view for explaining a slab construction method according to the prior art.

Figure 2 is a perspective view schematically showing the configuration of the formwork for weightless slab according to a preferred embodiment of the present invention.

3 is a cross-sectional view taken along line III-III ′ of FIG. 2.

Figure 4 is a schematic view from the bottom of the configuration of the formwork for weightless slab according to a preferred embodiment of the present invention.

5 is a schematic side view illustrating a process of constructing an upper slab using formless slab formwork according to a preferred embodiment of the present invention.

6 is a plan view schematically showing a state in which the slab formwork is mutually coupled to each other in the vicinity of the pillar in the preferred slab construction of the present invention.

7 is a plan view schematically showing a state in which the slab formwork is mutually coupled between the pillar and the pillar in the preferred weightless slab construction of the present invention.

8 is a schematic side view illustrating a process of constructing a lower slab using formless slab formwork according to a preferred embodiment of the present invention.

9 is a cross-sectional view showing the configuration of a formwork for weightless slab according to another preferred embodiment of the present invention.

FIG. 10 is a side view illustrating a process of constructing a slab using the formless slab formwork of FIG. 9. FIG.

It is a perspective view which shows the example of the embedding sleeve used for this invention.

The present invention relates to a weightless slab formwork and a weightless slab construction method using the same, and more particularly, to a weightless slab formwork and a method for constructing a weightless slab using the same, which does not generate waste materials after dismantling.

In general, in the construction of a slab of a building, a beam is first constructed between pillars, and then a slab is constructed based on the beam. 1 schematically shows a cross section of a beam-slab structure constructed by the most widely used conventional method.

As shown, after installing the formwork (1) between the column and the pillar and construct the beam, to install the floor formwork and slab based on the constructed beam. The beam may be H-shaped steel (not shown) or various reinforcing bars.

On the other hand, the height of each floor of the building plus the height of the interior space and the thickness of the slab structure. That is, the height of each layer can be reduced as the thickness of the slab structure is reduced. Therefore, even if the building of the same number of floors, the smaller the thickness of the slab structure, the smaller the floor height, the construction cost is reduced.

The thickness H of the slab structure is obtained by adding the thickness H1 of the beam and the thickness H2 of the slab. In order to reduce the thickness H of the slab structure, there may be a method of reducing the thickness H1 of the beam or the thickness H2 of the slab.

For this purpose, a so-called flat plate slab / flat slab method of placing slabs without a beam is widely used. There are two methods of constructing such slab free slabs: traditional methods and methods using a so-called table form.

The conventional method is to install the formwork connecting the beam and the slab, support the lower part with a circle, and then cast concrete. However, not only does the installation and dismantling of the formwork require a lot of effort and air, but also a complex and large number of clubs must be used to support the formwork bottom. Furthermore, when dismantling after construction, there is a problem that a lot of waste materials are generated, which adversely affects the environment.

In view of the above problems, there has been proposed a method of constructing a slab of slab using a formwork table form produced in a batch, but the table form is not only expensive, but also has difficulty in construction by mobilizing special equipment. . In particular, table forms have limitations that can only be applied to standardized construction.

The present invention was devised to solve the above problems, and can be applied to the construction of a variety of weightless slab structures irrespective of the structural design, formwork for weightless slabs that can minimize the provision of the lower support, such as clubbing and using the same It is an object of the present invention to provide a method for constructing a slab without weight.

Still another object of the present invention is to provide a heavy weight slab formwork and a weightless slab construction method using the same, which can be easily installed and dismantled, not generated waste materials, and can be continuously recycled.

Forms for slab slabs according to the present invention in order to achieve the above object, has a flat top surface is formed with a plurality of first through holes through which the hanging rod is formed, a plurality of insertion holes coupled to the fastening bolts on both sides A rectangular plate formed thereon; A plurality of rib members attached side by side while being spaced apart from each other on the lower surface of the plate; A plurality of reinforcing frames disposed below the rib member and having a second through hole corresponding to the first through hole; And a plurality of embedding sleeves having a hollow through which the hanging rod can penetrate, one end of which is attached to an upper surface of a portion where the first through hole of the plate is formed, and the other end of which extends upwardly; It includes.

According to still another aspect of the present invention, there is provided a flat upper surface, a pair of side walls formed side by side on both edges of the upper surface, and an extension extending outward from the upper end of the side wall, a plurality of fastening bolts are inserted into the extension. A rectangular plate having an insertion hole formed therein; A plurality of rib members attached side by side while being spaced apart from each other on the lower surface of the plate; A plurality of reinforcing frames disposed below the rib member and having a second through hole corresponding to the first through hole; And a plurality of embedding sleeves having a hollow therein through which the hanging rod can penetrate, one end of which is attached to an upper surface of a portion where the first through hole of the plate is formed and the other end of which extends upwardly. Formwork is provided.

Preferably, the plate is formed with an opening through which the pillar passes.

More preferably, the reinforcing frame is formed with a plurality of fastening holes in the lateral direction, it is configured to engage the formwork for adjacent slab slabs by bolts passing through the fastening holes.

Preferably, the rib member is a square tube, it may be formed integrally with the plate. More preferably, the rib member is composed of a synthetic sheet wrapped.

Further, the reinforcing frame may be arranged to support the lower edge of the plate, and at the same time orthogonal to the rib member.

Preferably, the reinforcing frame includes a square tube or a C-shaped tube.

More preferably, the embedding sleeve may be formed by rolling the material in the planar development state into a tube shape.

According to another aspect of the invention, (a) a rectangular plate having a flat upper surface and a plurality of first through-holes are formed, both sides with a plurality of insertion holes and side by side spaced apart from each other on the lower surface of the plate A plurality of attached rib members, a plurality of reinforcing frames installed under the rib members and formed with a second through hole corresponding to the first through hole, and having a hollow therein, and having one end of the first through hole of the plate formed therein. Providing a slab formwork for a weightless slab attached to an upper surface of the portion, the other end comprising a plurality of embedding sleeves extending upwardly; (b) the hanging slab formwork is mounted to the upper structure by using a hanging rod, one end of the hanging rod being fixed to the upper structure and the other end of the hollow and first and second through holes of the buried sleeve. Passing through and fixing to the reinforcing frame; (c) mounting a plate formwork to the upper edge of the plate; (d) reinforcing reinforcing bars on the top surface of the slab formwork and the plate formwork; (e) constructing upper solid slabs by pouring concrete and curing the upper surface of the plate so that the upper surface of the embedding sleeve is exposed; (f) demolding the formwork for the weightless slab and lowering it to a position where a lower weight weight slab is to be formed, and fixing one end of the hanging rod to the constructed upper weightless slab; And (g) mounting the plate formwork on the edge of the upper surface of the plate, reinforcing the reinforcing bars, placing concrete and curing to build a lower weight slab.

According to another aspect of the invention, (a) has a flat upper surface, a pair of side walls formed side by side on both edges of the upper surface and an extension extending outward from the upper end of the side wall, the extension has a plurality of insertion holes A formed rectangular plate and a plurality of rib members attached to the plate bottom surface while being spaced apart from each other; A plurality of reinforcing frames installed under the rib member and having a second through hole corresponding to the first through hole, and having a hollow therein, one end of which is attached to an upper surface of a portion where the first through hole of the plate is formed and the other end thereof Providing a formwork for a weightless slab comprising a plurality of embedding sleeves extending upwardly; (b) the hanging slab formwork is mounted to the upper structure by using a hanging rod, one end of the hanging rod being fixed to the upper structure and the other end of the hollow and first and second through holes of the buried sleeve. Passing through and fixing to the reinforcing frame; (c) mounting a plate formwork to an extension at an upper end of the side wall of the plate; (d) reinforcing reinforcing bars on the top surface of the slab formwork and the plate formwork; (e) constructing upper solid slabs by pouring concrete and curing the upper surface of the plate so that the upper surface of the embedding sleeve is exposed; (f) demolding the formwork for the weightless slab and lowering it to a position where a lower weight weight slab is to be formed, and fixing one end of the hanging rod to the constructed upper weightless slab; And (g) mounting the plate formwork to the extension at the upper end of the side wall of the plate, reinforcing the reinforcing bars, placing and curing concrete to build the lower weight slab construction; providing a slab construction method comprising a do.

Preferably, the reinforcing frame is formed with a plurality of fastening holes in the lateral direction, by coupling the bolts through the fastening holes to connect the adjacent slab formwork for each other.

More preferably, the plate is formed with an opening through which the pillar passes, and is coupled to face the opening of the slab formwork adjacent to the pillar.

Further, the plate form is fixed by inserting the fastening bolt through the insertion hole formed in the plate and the plate formwork of the plate and joining with the buried nut.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

2 to 4 schematically show the formwork for weightless slab 100 according to a preferred embodiment of the present invention. Referring to the drawings, the formwork for weightless slab 100 according to the present invention includes a rectangular plate 10 having a flat top surface.

As will be described later, the plate 10 has an appropriate size to form a plurality of slab formwork by interconnecting a plurality of pieces, preferably formed in a rectangular shape. Preferably, the opening 10a is formed at one side of the plate 10 to allow the pillar of the building to pass through as described later.

The plate 10 may be formed of glass fiber, carbon fiber, kevlar or mixed fiber or FRP thereof, but is not necessarily limited thereto. Alternatively, the plate 10 may be made of metal such as steel or wood such as plywood.

A plurality of rib members 12 are provided on the bottom surface of the plate 10. According to the present embodiment, the rib member 12 is a plurality of square tubes attached to the lower surface of the plate 10 while being spaced apart from each other. The tube is preferably formed of steel, but is not necessarily limited thereto. The rib member 12 prevents the slab formwork 100 for weightless slab according to the present invention from being bent or damaged during installation and construction.

The rib member 12 is a member that directly supports and reinforces the load when concrete is placed on the upper surface of the plate 10, and has a size, number, and spacing suitable for such a function according to construction scale and design. Can be arranged. In addition, the rib member 12 is preferably arranged in parallel with each other, but is not necessarily limited thereto.

The rib member 12 may be attached to the lower surface of the plate 10 by an adhesive or welding. Preferably, while the rib member 12 is attached to the lower surface of the plate 10, it may be formed integrally with the plate 10 by wrapping it with a synthetic sheet 14 made of carbon fiber or FRP. As another alternative, a composite sheet may be interposed between the plate 10 and the rib member 12.

A plurality of reinforcement frames 16 are installed and supported under the rib member 12. Preferably, the reinforcement frame 16 is orthogonal to the rib member 12 arranged in parallel with the outer reinforcement frame 16a arranged to support the lower edge of the plate 10, as shown in FIG. It may include an internal reinforcing frame 16b arranged to be spaced apart. However, it should be understood that such an arrangement structure of the reinforcing frame 16 is not limited by this embodiment. The reinforcement frame 16 as described above prevents the formwork from being bent or deformed when the concrete is poured.

The reinforcement frame 16 is a tube made of a metal material and includes a square tube or a C-shaped tube. Further, preferably, the reinforcing frames 16 may be fixed to each other by a method such as welding or bolting at the ends that contact each other.

The reinforcing frame 16 may be attached to the bottom surface of the rib member 12 of the formwork 100 in advance, or may be assembled in the process of installing the formwork in the field.

The reinforcing frame 16 is formed with a plurality of fastening holes 18 in the lateral direction, as shown in Figure 6, connecting the two adjacent slab formwork for slabs (100, 110) with a bolt coupling between each other It is desirable to make it possible. That is, the coupling bolt 20 may be inserted through the fastening hole 18 in a state where the outer reinforcement frames 16a of the dies 100 and 110 are opposed to each other, and then fixed by using the nut 22. However, the method of connecting the formwork for the weightless slab to each other is not limited by this embodiment and can be performed by using conventional means such as welding, of course.

Furthermore, as will be described later, the formwork for heavy slab 100 according to the present invention is installed while being supported by a plurality of hanging rods (see 30 in FIG. 5) suspended from the upper structure or the pre-built upper solid slab. For this purpose, as shown in FIG. 3, the plurality of first through holes 24 and the second through holes 26 through which the hanging rod 30 penetrates the plate 10 and the reinforcing frame 16 are provided. Are perpendicular to each other.

Positions of the first through hole 24 and the second through hole 26 are the same with respect to the vertical direction, and these through holes 24 and 26 are symmetrically to both sides from the center of the formwork as shown. It is formed in such a position that when the formwork is suspended on the upper structure or weightless slab as described below so that it can take a stable posture without tilting.

Although the embodiment of the present invention shows an example in which two through holes are symmetrically formed on each side, but not limited thereto, for example, three or more through holes may be arranged.

A buried sleeve 28 is installed in the vertical direction on an upper surface of a portion where the first through hole 24 of the plate 10 is formed. The embedding sleeve 28 is a tube having a hollow therein, the lower end is fixed to the upper surface of the plate 10, the upper end is extended to the upper. The method of fixing the embedding sleeve 28 to the plate 10 may employ various conventional bonding methods, including adhesives. As described later, the embedding sleeve 28 is embedded in concrete when dismantling the form after curing, so that it is preferably fixed only to be easily separated from the plate 10 during dismantling.

According to another preferred embodiment of the present invention, the buried sleeve 28 may be configured to roll the tube in a plan view state as shown in FIG. This is suitable for forming a sleeve by wrapping the hanging rod with the slab formwork suspended from the upper structure by the hanging rod as described below. However, it is to be understood that the configuration of the embedding sleeve is not limited by this embodiment, and any configuration capable of blocking the hanging rod from the concrete when placing the concrete can be employed.

The hollow of the embedding sleeve 28 is positioned to coincide with the first through hole 24. Thus, as shown in FIG. 5, the hanging rods 30 sequentially pass through the second and first through holes 26 and 24, and then extend upwards through the hollows of the embedding sleeve 28. Can be. Preferably, the embedding sleeve 28 has a length such that its upper end can be exposed to the top surface of the slab to be cast.

According to the present invention, a plurality of insertion holes 34 are formed at both edges of the plate 10 so that the fastening bolt 32 penetrates. The fastening bolt 32 is for fixing the deck plate or plywood formwork, etc. which are mounted on both sides of the weightless slab formwork of the present invention as described below, it is coupled with a buried nut (36 in Fig. 5). The buried nut 36 is formed to surround all of the screw end of the fastening bolt 32 to prevent the fastening bolt from contacting concrete, so that the fastening bolt can be smoothly removed when disassembling the form assembly, while the buried The dragon nut remains embedded in the concrete member.

According to the present invention, deck plates or plywood formwork made of wood may be mounted at both edges of the plate 10. The deck plate, as is well known, is typically made of steel, and may be supplied integrally with a crank rebar (not shown). Hereinafter, in the specification and claims, the deck plate and the plywood formwork are collectively referred to as 'plate formwork'.

Then, with reference to Figures 5 to 7 will be described how to construct a weightless slab using a formwork for a weightless slab having the configuration as described above. This embodiment shows an example of constructing a slab of slab of the basement layer in stages.

First, to form a pillar structure (C of Figure 6) by pitted H-beams and the like to form the pillar of the building. For example, in order to construct the floor slab of the ground floor, the trench is drilled to an appropriate depth, and then the formwork for the weightless slab according to the present invention is installed.

Preferably, the portion in which the column C is located is provided with the formwork 100 (110) for the slab having the opening (10a) (10b) as shown in Figure 6, between the shown in Figure 7 As such, the rectangular formwork for slabs (200, 210) is installed.

Specifically, in the portion where the pillar C is located, as shown in FIG. 6, the openings 10a and 10b of the slab formwork 100 and 110 face each other to face each other, and thus the opening 10a ( Allow the column to pass through 10b).

The formwork 100, 110 and 200, 210 may be coupled by using a connection bolt 20 and the nut 22 or by various conventional coupling methods such as welding.

According to the invention, the formwork is installed to hang on the upper structure. For example, as shown in Figure 5, the horizontal support steel (S) can be installed between the columnar structure (C) on the ground, the formwork assembly can be supported by hanging on it.

Preferably, a brace (T) is installed on the upper surface of the horizontal support steel (S) and the hanging rod 30 passes through the brace (T) after passing through the hollow of the embedding sleeve (28). At this time, one end of the hanging rod 30 is fixed by the fixing washer (W1) and the nut (N1). In addition, the other end of the hanging rod 30 passes through the through hole 24 formed in the plate 10 and the through hole 26 formed in the reinforcing frame 16, and then is fixed by the washer W2 and the nut N2. It is fixed.

The hanging rod 30 is preferably a wire (steel wire) or a rod made of a metal material such as steel or a high strength synthetic resin, but is not necessarily limited thereto. In addition, it is to be understood that the fixing of the hanging rod 30 may employ various conventional methods in addition to a method of forming a screw on both ends of the hanging rod and fastening nuts as in the present embodiment. As described above, by allowing the slab formwork for massless slabs to be lifted in the air, there is no need to install a support such as a copper bar at the bottom thereof, and thus it is possible to further secure a work space thereunder.

Subsequently, the edge of the plate formwork 50 is placed on the top edge of the formless slab formwork 100 and is coupled.

Preferably, the coupling of the plate formwork 50 and the slab formwork 100 for the slab is made by a fastening bolt 32 and a buried nut 36. That is, the end of the fastening bolt 32 passes through the insertion hole 34 formed in the formwork plate 10 and the fastening hole formed in the plate formwork 50, and then is coupled to the buried nut 36. The embedding nut 36 completely surrounds the screw end of the fastening bolt 32 to insulate the concrete when placing concrete as described below.

When the installation of the slab formwork 100 and the plate formwork 50 is completed as described above, the reinforcing bar (not shown) is placed on it. The rebar may be applied in various configurations depending on the size and design of the building.

Then, concrete is poured and poured onto the slab formwork and plate formwork and cured. At this time, it is preferable that the concrete is poured, for example, only up to the line L of FIG. 5 so that a weightless slab is formed to a thickness such that the upper surface of the embedding sleeve 28 is exposed to the concrete surface.

According to the present invention, once the concrete is cured, the lower layer weightless slab can be continuously constructed while demolding the formwork assembly for the weightless slab and descending downward. That is, as shown in Fig. 8, when the ceiling slab FL1 of the first basement floor is completed, the trench is continuously continued to secure an area in which the ceiling free slab of the second basement floor is to be constructed.

Subsequently, in order to demould the formwork, the fastening bolt N1 is loosened and the formwork assembly for the weightless slab is removed downward. The formwork assembly for the weightless slab is then separated downward while the embedding sleeve 28 is left embedded in the concrete.

The slab formwork 100 for slabs lowered in this way is supported by the suspended slabs FL1 that are already built, that is, suspended from the ceiling slabs of the first floor underground. That is, one end of the hanging rod 30 is fixed by the nut N3 in a state of penetrating the inside of the embedding sleeve 28 of the upper flat slab FL1 already constructed.

Another buried sleeve 28 'can be installed on the upper surface of the formwork plate 10 lowered to the lower side using, for example, the material shown in FIG. Therefore, the installation of the formwork for constructing the ceiling slab of the second basement level is completed. Subsequently, after installing the plate formwork 50, the process of reinforcing the reinforcing bars and placing the concrete is the same as described above.

By repeating the above process in the same manner it is possible to build a slab in step by step down to the lower layer. Although the present embodiment has been described an example of constructing a slab of basement layer while proceeding the trench, this is just an example, it can be equally applied to the ground layer. However, the trench process will be omitted in the ground layer.

9 shows a configuration of a formwork for a slab of slab 300 according to another embodiment of the present invention. Here, the same reference numerals as in the above-described drawings indicate the same members having the same function. Formwork for slab slab 300 according to the present embodiment is characterized in that the head to which the pillar of the building is located is thicker than the other areas.

9, the formwork for slab slab 300 according to the present embodiment includes a plate 310 having a flat upper surface. According to the present embodiment, the plate 310 includes a pair of sidewalls 320 and 330 formed in parallel at both edges thereof. The side walls 320 and 330 may be integrally formed of the same material as the plate 310. Due to the sidewalls 320 and 330, the weight of the slab that is constructed in the pillared portion may be thicker than in the above-described embodiment.

In addition, the upper end of the side wall 320, 330 is formed with an extension portion 340 extending outward, the plate formwork 50 is mounted on the upper surface of the extension portion 340. Therefore, the insertion hole 340a through which the fastening bolt 32 'for fixing the plate formwork 50 passes is formed in the extension portion 340. Since other components are the same as in the above-described embodiment, repeated description thereof will be omitted.

Formwork for slab free slab 300 according to the present embodiment is also installed while being supported by a plurality of hanging rods 30 hanging on the upper structure or the pre-built upper slab slab, the embodiment of this is shown in FIG. Is shown.

Unlike the above-described embodiment, the plate formwork 50 is placed on the extension 340 formed in the upper end of the side wall 320, 330 of the plate 310, the fastening bolt 32 'and the buried nut Fixed by 36 '. As a result, the weightless slab is a relatively thick structure in which the head to which the column is formed is relatively thick.

Formwork for slab slabs of the present invention can be applied to the construction of a variety of slab structures irrespective of the structural design by replacing the conventional table form, it is easy to install and dismantle without any special equipment to shorten the air and reduce construction costs Can be.

In addition, by minimizing the installation of lower supports such as copper bars, it is possible to secure a work space under the slab free of slabs, thereby improving work efficiency.

Furthermore, the slab formwork of the present invention is excellent in durability and can be dismantled and recycled after construction, and is environmentally friendly since it hardly generates waste materials as compared to conventional methods.

In addition, the formwork for slab slabs of the present invention to realize the economical and rational top-down construction of the floor height reduction, and because the floor height is reduced during the construction of the basement floor can minimize the amount of pit soil and thus can be economically and environmentally friendly construction.

Claims (14)

A rectangular plate having a flat upper surface and having a plurality of first through holes for penetrating the hanging rods, and having a plurality of insertion holes coupled to fastening bolts at both sides thereof; A plurality of rib members attached side by side while being spaced apart from each other on the lower surface of the plate; A plurality of reinforcing frames disposed below the rib member and having a second through hole corresponding to the first through hole; And A plurality of embedding sleeves having hollows through which the hanging rods can penetrate, one end of which is attached to an upper surface of a portion where the first through hole of the plate is formed, and the other end of which extends upward; Formwork for a slab slab characterized in that it comprises a. A rectangular plate having a flat upper surface, a pair of sidewalls formed on both sides of the upper surface, and an extension portion extending outwardly from an upper end portion of the sidewall, the extension portion having a plurality of insertion holes into which fastening bolts are inserted; A plurality of rib members attached side by side while being spaced apart from each other on the lower surface of the plate; A plurality of reinforcing frames disposed below the rib member and having a second through hole corresponding to the first through hole; And And a plurality of embedding sleeves having a hollow through which the hanging rod can penetrate, one end of which is attached to an upper surface of a portion where the first through hole of the plate is formed and the other end of which extends upwardly. Formwork for heavy duty slabs. The method according to claim 1 or 2, Formwork for slab slab, characterized in that the plate is formed with an opening through which the pillar passes. The method of claim 3, The reinforcement frame is formed with a plurality of fastening holes in the lateral direction, the formwork for slab slabs, characterized in that for coupling the adjacent slab formwork slabs by bolts passing through the fastening holes. The method of claim 4, wherein The rib member is a square tube, formwork for a slab slab, characterized in that formed integrally with the plate. The method of claim 4, wherein The rib member is weightless slab formwork, characterized in that wrapped with a synthetic sheet. The method of claim 4, wherein The reinforcement frame is arranged to support the lower edge of the plate, at the same time arranged for orthogonal slab formwork, characterized in that arranged to be perpendicular to the rib member. The method of claim 4, wherein The reinforcement frame is a slab formwork for slab, characterized in that it comprises a square tube or C-shaped tube. The method of claim 4, wherein The embedding sleeve is a formwork for slab slab, characterized in that formed by rolling the tube material in the state of planar development. (a) a rectangular plate having a flat upper surface and formed with a plurality of first through holes, and having a plurality of insertion holes formed at both sides thereof, a plurality of rib members attached side by side while being spaced apart from each other on the lower surface of the plate, and A plurality of reinforcing frames installed at the bottom of the rib member and having a second through hole corresponding to the first through hole, and having a hollow therein, one end of which is attached to an upper surface of a portion where the first through hole of the plate is formed and the other end of the Providing a formwork for a weightless slab comprising a plurality of embedding sleeves extending into; (b) the hanging slab formwork is mounted to the upper structure by using a hanging rod, one end of the hanging rod being fixed to the upper structure and the other end of the hollow and first and second through holes of the buried sleeve. Passing through and fixing to the reinforcing frame; (c) mounting a plate formwork to the upper edge of the plate; (d) reinforcing reinforcing bars on the top surface of the slab formwork and the plate formwork; (e) constructing upper solid slabs by pouring concrete and curing the upper surface of the plate so that the upper surface of the embedding sleeve is exposed; (f) demolding the formwork for the weightless slab and lowering it to a position where a lower weight weight slab is to be formed, and fixing one end of the hanging rod to the constructed upper weightless slab; And (g) placing the formwork on the upper edge of the plate, reinforcing reinforcing bars, placing concrete and curing to build a lower weight slab slab construction method comprising a; slab construction method comprising a. (a) a flat upper surface, a pair of sidewalls formed at both edges of the upper surface, and an extension portion extending outwardly from the upper end portion of the sidewall, wherein the extension portion has a rectangular plate having a plurality of insertion holes; A plurality of rib members attached side by side while being spaced apart from each other; A plurality of reinforcing frames installed under the rib member and having a second through hole corresponding to the first through hole, and having a hollow therein, one end of which is attached to an upper surface of a portion where the first through hole of the plate is formed and the other end thereof Providing a formwork for a weightless slab comprising a plurality of embedding sleeves extending upwardly; (b) the hanging slab formwork is mounted to the upper structure by using a hanging rod, one end of the hanging rod being fixed to the upper structure and the other end of the hollow and first and second through holes of the buried sleeve. Passing through and fixing to the reinforcing frame; (c) mounting a plate formwork to an extension at an upper end of the side wall of the plate; (d) reinforcing reinforcing bars on the top surface of the slab formwork and the plate formwork; (e) constructing upper solid slabs by pouring concrete and curing the upper surface of the plate so that the upper surface of the embedding sleeve is exposed; (f) demolding the formwork for the weightless slab and lowering it to a position where a lower weight weight slab is to be formed, and fixing one end of the hanging rod to the constructed upper weightless slab; And (g) placing the plate formwork on the extension at the upper end of the side wall of the plate, reinforcing reinforcement, placing and curing concrete to build a lower weight slab slab construction; comprising a slab construction comprising a Way. The method according to claim 10 or 11, wherein The reinforcing frame is formed with a plurality of fastening holes in the lateral direction, Weightless slab construction method characterized in that connecting the adjacent formwork for slab slabs by coupling the bolt through the fastening hole. The method of claim 12, The plate is formed with an opening through which the pillar passes, A weightless slab construction method characterized in that the coupling of the formwork for the slab formwork adjacent adjacent to the pillar facing each other. The method of claim 12, Weightless slab construction method characterized in that the fixing of the plate formwork by inserting the fastening bolt through the fastening hole formed in the insertion hole of the plate and the plate formwork, and coupled with a buried nut.

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