JP5300644B2 - RC slab construction method for building structures using end-clad flat deck plates - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To construct an RC slab with excellent economical efficiency by enabling raising of the RC slab without the need for a raising material. <P>SOLUTION: In a structure of this flat deck plate 1 with a closed end, the closed ends 1a in an undersurface position of a rib, which are constituted by crushing a flat plate 2 to the undersurface position of the stiffening rib, are formed at both the longitudinal ends of the flat deck plate which is equipped with the plurality of stiffening ribs formed by bending the flat plate 2 on a top surface downward over a length direction, respectively. When the RC slab 15 is constructed using a permanent form in which the closed ends 1a of both the longitudinal ends of the flat deck plate 1 with the closed end are placed on a beam 6, the RC slab 15 raised with respect to the top surface of the beam 6 is obtained. An excessive design, in which the slab thickness d of the RC slab 15 is excessively increased, can be avoided without the need for the raising material. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

This invention relates to RC slabs (reinforced concrete slab) method for constructing a building structure with end closures flat deck plates of closing the longitudinal end portion.

As shown in FIG. 3, the flat deck plate 1 _0, the stiffening ribs 3 formed by bending downward the flat portion of the top surface over the length in plural rows with cross-sectional shape, is manufactured by roll forming It is a structural steel material, and is mainly used by arranging and arranging a plurality of reinforced concrete slabs (hereinafter referred to as RC slabs) such as floor slabs and roof slabs of building structures. The illustrated stiffening rib 3 is a hollow type having a two-layer overlapping portion 3a connected to the upper surface and a triangular hollow portion 3b below the overlapping portion 3a. There is also a closed type (FIG. 9 described later) without a hollow part.
The flat deck plate 1 ₀ has a short width flat portion 2a on one edge, with the engaging piece 4 is bent in an L shape to the other edge, to form a large number of embossing 5 the flat portion 2 Yes. In addition, illustration of the emboss 5 is abbreviate | omitted in the other figure.
Two flat deck plate 1 ₀ Adjacent couples insert the locking piece 4 of one of the flat deck plate 1 ₀ in the gap of the other flat deck plate 1 ₀ side edge perpendicular two-ply portion 3a .

The flat deck plate 1 ₀ is typically used in a closed process for closing crushed the both ends in the longitudinal direction. The flat deck plate whose end is closed is generally called an end closed flat deck plate.
As shown in FIGS. 10 and 11, the closed end portion 1a ′ of the conventional end closed flat deck plate 1 ′ (which indicates a closed closed state by crushing) is as shown in FIG. It is crushed to the flat plate portion 2 side, and the closed end portions 1a ′ at both ends are hung on the beam 6 and used as a discarded mold (Patent Document 1). The beam 6 in the illustrated example is an H-shaped steel beam (a steel beam made of H-shaped steel).
The closed end flat deck plate has advantages such as preventing the leakage of concrete from both ends in the span direction of the stiffening rib when the concrete is placed by closing both ends.

By the way, as a recent trend of buildings such as office buildings, it is often designed by using multiple types of floor structures for different purposes so that the specifications have economy, comfort and versatility. Yes.
For example, FIG. 12 shows an H-section steel beam 6 as a boundary, an office floor 13 composed of a slab 11 having an appropriate structure and a double floor 12 such as a so-called OA floor on one side, an RC slab 15 and a carpet on the other side. The case where the common part floors 17, such as a corridor which consists of the finishing 16 of this, and a toilet, is built is shown. Reference numeral 18 denotes a wall.

Various slabs such as a composite slab structure, a unidirectional slab structure, and an RC slab structure are adopted as the slab 11 of the office section floor 13 that performs the office work. It is assumed that the composite slab structure constructed using the deck plate for the machine is adopted. 11a shows a deck plate and 11b shows a concrete layer portion.
Further, in consideration of comfort and versatility, an OA floor (that is, a double floor) 12 corresponding to the LAN environment is disposed for finishing.
In addition, in the case of the deck plate 11 including the deck plate for the synthetic slab and having the ridges and the valleys arranged in a waveform, the upper surface side (mountain surface) is changed to the lower surface side (valley surface) as shown in the figure. Conventionally, a deck plate having a clogged closed end is used.
The synthetic slab structure is a structure that is constructed using a deck plate for a synthetic slab provided with a mechanism for preventing slippage and separation from concrete, and is a floor structure in which the deck plate and concrete are integrated to contribute to rigidity. The unidirectional slab structure is a reinforced concrete slab arranged in one direction using a groove in the deck plate, and the deck plate is a floor structure that bears the weight of the slab.

  On the other hand, the common part floor 17 such as the corridor and the toilet adopts an RC slab structure 15 using an end closed flat deck plate 1 ′ in consideration of piping air conditioning and the like, and the finish 16 is provided with carpeting or the like. ing. Adopting an OA floor for the common part floor 17 is hardly performed because it becomes an excessive design from the viewpoint of designing an economical slab structure.

  In this case, the floor surface 17a of the common part floor 17 and the floor surface 13a of the office part floor 13 need to be at the same height level. However, as shown in FIG. If the concrete is placed by placing the closed end 1a 'of 1' directly on the beam 6 because the OA floor 12 is raised, the floor surface 13a of the office floor 13 is high. The slab thickness d of the RC slab 15 of the common use floor 17 becomes excessively thick and lacks economic efficiency. For this reason, this construction method is not often used.

  Therefore, conventionally, as the common part floor 17, as shown in FIG. 13, a method of laying the flat deck plate 1 'in the position calculated backward from the finished height in accordance with the slab thickness required for rigidity, that is, the flat deck plate The raising method of raising the upper surface of 1 'to a position higher than the upper surface of the H-shaped steel beam 6 is adopted. For this purpose, a grooved steel or an angle steel is welded to the side of the beam in advance as the raised material 19. It was designed to be attached. Thereby, RC slab 15 of common use floor 17 becomes economic design.

In the specific case where the structure of FIG. 13 using the raising material 19 is constructed, when a synthetic slab is employed as the slab 11 of the office floor 13, for example, many designs in the following dimensional range are employed. Has been.
For the office floor 13, the slab thickness a of the synthetic slab 11 is 145 to 165 mm, the height b of the double floor 12 is 100 mm, and the total c of the slab thickness a and the double floor height b is 245 to 265 mm. For the partial floor 17, the slab thickness d of the RC slab 15 is 140 to 165 mm, and the finish e of the carpet floor is 0 to 10 mm. The raising height f is determined according to the specific setting of each dimension.
In FIG. 12, when the office floor 13 has the dimensions a, b and c, the slab thickness d of the RC slab 15 is changed from c (= 245 to 265 mm) to a finished thickness e (0 to 10 mm). As described above, the slab becomes excessively thick.
The common part floor 17 adopts an RC slab structure instead of an economical synthetic slab structure in consideration of the above-described piping air conditioning and the like. That is, in the design of buildings, various pipes are often passed through the common floor, but in synthetic slabs where the deck plate functions as a strength member, it is a strength to make through holes for piping in the deck plate. It is difficult to design because it impairs the structure, and it is difficult to adopt a synthetic slab structure for the common floor that penetrates various pipes.

Patent document 2 is not a flat deck plate, but in a building structure, for example, when deck plates having different wave heights are used on both sides of a beam, where a wide span and a narrow span are adjacent to each other, As a joining method for joining plates on a beam, a method is described in which a deck plate having a low wave height is placed on a partitioning material placed on the beam and the top surface heights of deck plates having different wave heights are aligned. .

Japanese Patent No. 2736587 (JP-A-6-123154) Fig. 1 etc. of Jokho Sho 63-7613.

As shown in FIG. 13, the method of raising the flat deck plate 1 ′ by welding and fixing the raising material 19 to the beam is costly due to the material cost and processing cost of the raising material 19 required as separate members. In addition, the operation of welding and fixing the raising material 19 is complicated, and the cost is increased due to the increase in man-hours and management points.
In addition, when the raising material is not used as shown in FIG. 12, the cost increases due to the increase in the amount of concrete, and the cost increases due to the increase in the size of the steel member required in accordance with the accompanying increase in weight. .

  By the way, in a steel structure, there is a case where a composite beam is designed from the viewpoint of cost reduction. As shown in FIG. 14, the composite beam 21 is formed by arranging a headed stud 22 on the steel beam 6 and integrating the concrete 23 directly above the beam with the behavior of the steel beam 6 via the headed stud 22. This is intended to improve the cross-sectional performance of the beam structure. In this case, the concrete thickness K immediately above the beam is equal to or greater than the appropriate concrete thickness corresponding to the cross-sectional performance required for the composite beam. Note that the concrete (concrete constituting the composite beam) 23 immediately above the beam is simultaneously placed by concrete placement performed when the slabs 25 having appropriate structures on both sides of the steel beam 6 are constructed.

As shown in FIG. 15, the RC slab 25 is constructed by placing the conventional flat deck plate 1 ′ directly on the steel beam 6 on both sides of the steel beam 6 as a boundary. In this case, there is a case where the slab thickness g of the RC slab 25 becomes excessively thick with respect to an appropriate concrete thickness K corresponding to the cross-sectional performance required for the composite beam, which is not economical. In this case, as shown in FIG. 16, when the slab thickness g of the RC slab 25 is set to an appropriate slab thickness g required for the RC slab 25, the composite beam 21 lacks the concrete thickness K and the sectional performance of the composite beam is reduced. Because it becomes insufficient, it cannot be adopted.
Therefore, in order to achieve both the proper slab thickness g of the RC slab 25 and the concrete thickness K of the composite beam 21 as shown in FIG. 17, the same as the RC slab of FIG. If the RC slab 25 is raised by the raising material 19, as described above, there is a problem of increased cost due to the use of the raising material 19.

The present invention has been made based on the above background, can be the raising of the RC slab without requiring raising material, building structures capable of establishing a good RC slab economics An object of the present invention is to provide a method for constructing an RC slab of an object, and when constructing an RC slab using a composite beam structure, satisfying a cross-sectional performance required for the composite beam, and raising the RC slab An object of the present invention is to provide an RC slab construction method for a building structure that can achieve both an appropriate slab thickness without any need.

An RC slab construction method for a building structure according to the invention of claim 1 that solves the above-described problem is a flat deck plate having a plurality of stiffening ribs formed by bending a flat plate portion of an upper surface downward in the length direction. A mode in which an end closed flat deck plate having a rib lower surface position closed end portion formed by crushing a flat plate portion to the position of the lower surface of a stiffening rib at both ends in the longitudinal direction is spanned between the beams with the flat plate portion side facing up. It is characterized by constructing an RC slab that is raised with respect to the upper surface of the beam by using it as a discarded formwork .

An RC slab construction method for a building structure according to a second aspect of the invention includes a first floor having a double floor on one side, a second floor having an RC slab on the other side, with a beam as a boundary. When building an RC slab for a building structure, the RC slab for the second floor is constructed such that the second floor has the same floor height as the floor height of the first floor. And
When constructing the RC slab of the second floor, flat plates are formed on both ends in the longitudinal direction of the flat deck plate having a plurality of stiffening ribs formed by bending the flat plate portion of the upper surface downward in the length direction. Using an end closed flat deck plate with a rib lower surface position closed end formed by crushing the portion to the stiffening rib lower surface position, as a discarded mold frame spanning between the beams with the flat plate portion side up An RC slab raised to the upper surface of the beam is constructed.

The RC slab construction method for a building structure according to the invention of claim 3 is the RC having a slab thickness required for design strength smaller than that of the first floor on one side, the first floor, and the other side with the beam as a boundary. An architectural structure for constructing the second floor RC slab so that the second floor has the same floor height as the first floor when the second floor having the slab is constructed An RC slab construction method for objects,
When constructing the RC slab of the second floor, flat plates are formed on both ends in the longitudinal direction of the flat deck plate having a plurality of stiffening ribs formed by bending the flat plate portion of the upper surface downward in the length direction. Using an end closed flat deck plate with a rib lower surface position closed end formed by crushing the portion to the stiffening rib lower surface position, as a discarded mold frame spanning between the beams with the flat plate portion side up An RC slab raised to the upper surface of the beam is constructed.

  The RC slab construction method for a building structure according to the invention of claim 4 is used when concrete is placed when the RC slab is constructed by the RC slab construction method for a building structure according to claim 2 or 3 when the beam is a steel beam. In addition, a headed stud is preliminarily welded and fixed to the upper surface of the steel beam, and then concrete is placed directly on the steel beam to simultaneously construct a composite beam.

In the RC slab construction method for a building structure according to the invention of claim 5, when the RC slab is constructed on both sides of the steel beam as a boundary , the upper surface flat plate portion is bent downward in the length direction on both sides. End closed flat deck with rib lower surface position closed end formed by crushing the flat plate portion to the lower surface of the stiffening rib at both longitudinal ends of the flat deck plate having a plurality of stiffening ribs formed An RC slab construction method for a building structure that constructs an RC slab that is raised with respect to the upper surface of a beam by using a plate as an abandoned form that spans between the beams with the flat plate portion side up. ,
When placing concrete when constructing the RC slab,
A headed stud is welded and fixed to the upper surface of the steel beam in advance, and concrete is placed directly on the steel beam to simultaneously construct a composite beam.

According to RC slab construction method of a building structure of the invention of claim 1, the both ends in the longitudinal direction, the structure having a rib lower surface position closed end formed by crushing a flat plate portion to the stiffening rib lower surface position Since the RC slab is constructed as an abandoned formwork in which the closed end flat deck plate is placed between the beams with the flat plate portion side up , the RC slab is approximately the height of the stiffening rib from the beam upper surface position. Raised.
In this way, it is possible to construct a raised RC slab without using a raised material, which increases the cost due to the material cost and processing cost of the raised material, and increases the cost due to the increased number of man-hours for installing the raised material and management points. A problem-free economic design is realized.

According to the RC slab construction method of the invention of claim 2, in the case of constructing a first floor having a double floor on the slab on one side of the beam and a second floor having an RC slab on the other side, When aligning the floor surface height of the second floor and the first floor, the structure has a rib lower surface position closed end portion formed by crushing the flat plate portion to the stiffening rib lower surface position at both ends in the longitudinal direction. It is possible to construct an RC slab with excellent economic efficiency by using the end-capped flat deck plate as a discarding form frame in which the flat plate portion side faces up and is spanned between the beams .

According to the RC slab construction method of the invention of claim 3, the first floor having a slab having a large slab thickness required on one side of the beam, and a small slab thickness required on the other side is small. When constructing the second floor with RC slabs and aligning the floor heights of the second floor and the first floor , the flat plate portions are positioned at the lower end of the stiffening rib at both longitudinal ends. By using an end-capped flat deck plate with a structure where the rib bottom surface position clogged end is crushed until it is used as a discarded mold frame that spans between the beams with the flat plate part side up, it is excellent in economic efficiency An RC slab can be constructed.

  According to the RC slab construction method of the invention of claim 4, the RC slab construction method of the building structure of claim 2 or 3 can be applied when a composite beam is constructed with a steel beam.

According to the RC slab construction method of the fifth aspect of the present invention, when the RC slab is constructed on both sides of the composite beam , the flat plate portion is crushed to the lower surface of the stiffening rib at both longitudinal ends. The cross section performance required as a composite beam is satisfied by using an end closed flat deck plate having a structure having a rib lower surface position closed end as a discarded form frame in a state where the flat plate portion side is placed between the beams. This makes it possible to achieve both the construction of an RC slab having an appropriate slab thickness without a raising material.

It is a side view which shows the state which spanned the edge part obstruction | occlusion flat deck plate between the beams, when constructing RC slab using the edge part obstruction | occlusion flat deck plate of this invention. (A) is an enlarged view of the vicinity of the closed end of FIG. 1, and (b) is an AA main part cut end view of (a). The flat deck plate before the edge part closing process of the edge part obstruction | occlusion flat deck plate of the Example of this invention is shown, (A) is a top view, (B) is a figure which shows a cross-sectional shape. It is a perspective view which shows the obstruction | occlusion end vicinity of the edge part obstruction | occlusion flat deck plate of one Example of this invention. It is a figure explaining the RC slab construction method of the building structure of one Example of this invention constructed | assembled using the said edge part obstruction | occlusion flat deck plate. It is a figure explaining the RC slab construction method of a building structure in case the beam in the RC slab structure of the Example of FIG. 5 is made into a composite beam. It is a figure explaining the RC slab construction method of the building structure of one Example of this invention in case RC is built on both sides of a beam and a beam is used as a composite beam. It is a figure explaining the RC slab construction method of the building structure of one Example of the present invention in the case of constructing RC slabs with different required slab thicknesses on both sides of the beam. It is a figure which shows the other example of the cross-sectional shape of the flat deck plate before the edge part obstruction | occlusion process of the edge part obstruction | occlusion flat deck plate of this invention. It is a side view which shows the state which spanned the edge part obstruction | occlusion flat deck plate between beams, when constructing RC slab using the conventional edge part obstruction | occlusion flat deck plate. FIG. 11A is an enlarged view of the vicinity of the closed end portion of FIG. 10, and FIG. It is a figure explaining the RC slab construction method of the building structure constructed | assembled by mounting the conventional edge block flat deck plate of FIG. 10 directly on the beam. It is a figure explaining the RC slab construction method of the building structure constructed | assembled by mounting the conventional edge part obstruction | occlusion flat deck plate of FIG. 10 on the raising material fixed to the beam. It is a figure explaining a composite beam. When RC slabs are constructed on both sides of a beam and the beam is a composite beam, it is a diagram illustrating an RC slab structure constructed by placing a conventional end block flat deck plate directly on the beam. In FIG. 15, it is a figure explaining the inconvenience at the time of constructing | assembling a composite beam according to the required slab thickness of RC slab. When building RC slabs on both sides of the beam and making the beam as a composite beam, the RC slab building method for a building structure constructed by placing a conventional end block flat deck plate on a raising member fixed to the beam FIG.

Hereinafter, the Example of the RC slab construction method of the building structure of this invention is described with reference to FIGS.

FIG. 1 shows that when an RC slab is constructed using the end-capped flat deck plate 1 of the present invention, a plurality of end-capped flat deck plates 1 are laid across and arranged between the beams 6 as a discarded frame. 2A is an enlarged view of the vicinity of the closed end portion of FIG. 1, and FIG. 2B is a cross-sectional view of the portion of the rib 3 for stiffening.
The end closure flat deck plate 1 is obtained by closing the both ends of longitudinal direction of the flat deck plate 1 ₀ in FIG. 3 described above. The description of FIG. 3 is omitted.

  As shown in the perspective views of FIGS. 1, 2, and 4, the end closed flat deck plate 1 of the present invention is different from the conventional end closed flat deck plate 1 ′ described in FIGS. 10 and 11. On the contrary, the upper surface side (the flat plate portion 2 side) is crushed to the substantially lower surface position of the stiffening rib 3. That is, a rib lower surface position closed end portion (hereinafter simply referred to as a closed end portion) 1 a formed by crushing the flat plate portion 2 to a substantially lower surface position of the stiffening rib 3 is provided.

FIG. 5 shows an embodiment in which the RC slab 15 is constructed by using this end closed flat deck plate (hereinafter simply referred to as “flat deck plate” in some cases) 1.
In this embodiment, with an H-shaped steel beam 6 as a boundary, an office floor 13 consisting of a slab 11 having an appropriate structure on one side and a double floor 12 such as a so-called OA floor, and finishing of an RC slab 15 and a carpet on the other side. This is a case where a common part floor 17 such as a corridor composed of 16 is constructed. Reference numeral 18 denotes a wall.

Various slabs such as a synthetic slab structure, a unidirectional slab structure, and an RC slab structure are adopted as the slab 11 of the office section floor 13 that performs the office work. The case where the synthetic slab structure constructed using the deck plate for slabs is adopted is assumed. Reference numeral 11a denotes a deck plate, and 11b denotes a concrete layer portion above the top surface of the deck plate.
In RC slabs, the discarded form deck plate does not bear rigidity, so the reinforced concrete part d above the top surface of the deck plate has the slab thickness d. Since the rigidity is borne, the thickness a including the deck plate 11a is the slab thickness a.
In addition, an OA floor (that is, a double floor) 12 corresponding to the LAN environment is disposed on the slab 11 in consideration of comfort and versatility.
On the other hand, an RC slab structure using a flat deck plate is adopted for the common part floor 17 such as a corridor and a toilet in consideration of piping air conditioning and the like, and the finish 16 is provided with carpeting or the like.

In this case, the floor surface 17a of the common use floor 17 and the floor surface 13a of the office floor 13 need to be at the same level, but the conventional end block flat deck plate 1 'is used as a beam as shown in FIG. When the RC slab 15 is constructed by directly mounting on the slab 6, the slab thickness d is excessively thick.
Therefore, as shown in the drawing, the end block flat deck plate 1 of the present invention is used as a discarded mold for constructing the RC slab 15 of the common use floor 17. The flat deck plate 1 is bridged between the H-shaped steel beams 6 on both sides of the span in the manner shown in FIGS. 1, 2, and 4. If an RC slab is constructed using this as a discarded formwork, the slab thickness as shown in FIG. A raised RC slab 15 of d is constructed.
As described above, according to the end closed flat deck plate 1 of the present invention, it is possible to construct a raised RC slab without using a raised material, and increase the cost due to the material cost and processing cost of the raised material. Economic design without the problem of cost increase due to the increase in man-hours for installing the raising material and the number of management points is realized.

5 will be described. The specifications of the office floor 13 are the same as those in FIG. 13, the slab thickness a of the synthetic slab 11 is 145 to 165 mm, and the height b of the double floor 12 is It is assumed that the total c of 100 mm, the slab thickness a and the double floor height b is 245 to 265 mm.
As for the common use floor 17, a flat deck plate 1 having a height h of 100 mm higher than a typical flat deck plate 75 mm is used. The slab thickness d of the RC slab 15 is 140 to 165 mm as in FIG. 13, and the finish e of the carpet floor is 0 to 10 mm.

FIG. 6 shows an embodiment in which the H-shaped steel beam 6 in FIG. 5 is a composite beam.
That is, when the concrete slab 15 of FIG. 5 is constructed, a headed stud 22 is welded and fixed to the upper surface of the H-shaped steel beam (steel beam) 6 in advance, and the concrete is also directly above the beam. 23, and the composite beam 21 is constructed at the same time.

FIG. 7 shows a case where the RC slab 25 is constructed using the end block flat deck plate 1 of the present invention as a discarding frame on both sides of the H-shaped steel beam 6, and the H-shaped steel beam 6 is synthesized. In this embodiment, the beam 21 is used.
That is, on both sides of the H-shaped steel beam 6, when the concrete is placed when the RC slab 25 is constructed using the flat deck plate 1 of the present invention as a discarded formwork, the H-shaped steel beam (steel beam) 6 The headed stud 22 is welded and fixed to the upper surface in advance, and the concrete 23 is placed directly on the beam to construct the composite beam 21 and the RC slab 25 at the same time. In the illustrated example, a finish 16 such as a carpet is disposed.
As shown in FIG. 15, when the conventional flat deck plate 1 ′ is directly placed on the beam 6 and the RC slabs 25 on both sides are constructed, the appropriate concrete corresponding to the cross-sectional performance required for the composite beam 21 as described above. Although the slab thickness g (g = K) of the RC slab 25 is excessively thick with respect to the thickness K, when the RC slab 25 is constructed using the flat deck plate 1 of the present invention as shown in FIG. The slab thickness g of the RC slab 25 can be made appropriate, and an excessively thick overdesign can be avoided.
Further, it is possible to avoid an increase in cost by using the raising material.
Therefore, it is possible to satisfy both of satisfying the cross-sectional performance required as the composite beam 21 and constructing the RC slab 25 having an appropriate slab thickness g without the raising material.

FIG. 8 shows the first floor 33 provided with a slab 31 having a large slab thickness m required for strength due to installation of heavy equipment on one side with the beam 6 as a boundary, and the other side has too much load. When constructing the second floor 37 having the RC slab 35 having a small slab thickness n required for strength, the RC slab 35 of the second floor 37 is replaced with the floor surface of the second floor 37. This is an embodiment in the case where 37a and the floor surface 33a of the first floor 33 are constructed to have the same height level.
The slab 31 of the illustrated first floor 33 is assumed to be a synthetic slab. However, it may be a unidirectional slab structure, an RC slab structure using a corrugated ordinary deck plate, or other slabs.
The end block flat deck plate 1 of the above-described embodiment is used as a discarded mold when the RC slab 35 of the second floor 37 is constructed.
Thereby, the RC slab 35 raised with respect to the upper surface of the beam 6 is constructed.
When the RC slab of the second floor 37 is constructed, if the RC slab is constructed using the conventional flat deck plate 1 ′ like the RC slab 15 of the common part in FIG. Although the 37 RC slabs are overdesigned, by using the flat deck plate 1 of the present invention and raising the RC slab 35 with an appropriate slab thickness n, overdesign can be avoided.

The cross-sectional shape of the stiffening rib in the flat deck plate used in the present invention is not limited to the cross-sectional shape as in the stiffening rib 3 of the above-described embodiment, and the shape and size of the hollow portion 3b are the same in the hollow type. Various cross-sectional shapes are possible, such as different ones and different ones having different heights (vertical lengths).
Further, for example, as _'stiffening ribs 3' flat deck plate 1 ₀ shown in FIG. 9, 'with its two-ply portion 3a' whole no hollow portion 2 ply portion 3a is L-shaped It may have a cross-sectional shape.

1 ₀ end occluded non-flat deck plate first end closure flat deck plate 1a closed end 2 flat portions 3 and 3 'stiffening ribs 3a, 3a' two-ply portion 3b hollow section 6 Beams (steel beam (H-type Steel beam))
11 Slab 11a (of the first floor 13) Deck plate 11b Concrete layer portion 12 Double floor 13 (of the first floor 13) First floor (the floor of the office)
13a First floor 15 (second floor 17) RC slab 16 (second floor 17) finish 17 Second floor (common use floor)
17a Floor surface 18 of the second floor Wall a Slab thickness b of the first floor slab 11 Height c of the double floor 12 Sum of the slab thickness a of the first floor slab and the height b of the double floor Thickness d Slab thickness of RC slab 15 of second floor e Thickness of finish 16 of second floor 21 Composite beam 22 Headed stud 23 Concrete 25 RC slab g (when RC slab is constructed on both sides of steel beam) Slab thickness of RC slab 25 (when RC slabs are constructed on both sides of steel beam) K Concrete thickness of composite beam 31 Slab 31a of first floor 33 Deck plate 31b Concrete layer portion 33 First floor 33a First 1 floor slab 35 (second floor 37) RC slab 36 (second floor 37) finish 37 second floor 37a second floor floor m first floor slab 31 slab Thickness n 2nd floor RC slab 35 slab

Claims (5)

A rib formed by crushing the flat plate portion to the lower surface of the stiffening rib at both longitudinal ends of a flat deck plate having a plurality of stiffening ribs formed by bending the flat plate portion of the upper surface downward in the length direction. End block flat deck plate with bottom position block end ,
An RC slab construction method for a building structure, wherein the RC slab is raised with respect to the upper surface of the beam by using it as a discarded mold frame in a state of being extended between the beams with the flat plate portion side up . When constructing a first floor with a double floor on a slab on one side with a beam as a boundary and a second floor with an RC slab on the other side, the RC slab of the second floor is An RC slab construction method for a building structure constructed so that the second floor has the same floor height as the first floor,
When constructing the RC slab of the second floor, flat plates are formed on both ends in the longitudinal direction of the flat deck plate having a plurality of stiffening ribs formed by bending the flat plate portion of the upper surface downward in the length direction. Using an end closed flat deck plate with a rib lower surface position closed end formed by crushing the portion to the stiffening rib lower surface position, as a discarded mold frame spanning between the beams with the flat plate portion side up An RC slab construction method for a building structure, wherein the RC slab is raised with respect to the beam upper surface. When constructing the second floor having the RC slab whose slab thickness required for design strength is smaller than that of the first floor on one side, the first floor on the other side with the beam as the boundary, An RC slab construction method for a building structure in which an RC slab of 2 floors is constructed so that the second floor has the same floor surface height as the floor surface of the first floor,
When constructing the RC slab of the second floor, flat plates are formed on both ends in the longitudinal direction of the flat deck plate having a plurality of stiffening ribs formed by bending the flat plate portion of the upper surface downward in the length direction. Using an end closed flat deck plate with a rib lower surface position closed end formed by crushing the portion to the stiffening rib lower surface position, as a discarded mold frame spanning between the beams with the flat plate portion side up An RC slab construction method for a building structure, wherein the RC slab is raised with respect to the beam upper surface.   When the concrete is placed when the RC slab is constructed by the RC slab construction method for a building structure according to claim 2 or 3 when the beam is a steel beam, a headed stud is welded and fixed to the upper surface of the steel beam in advance. An RC slab construction method for a building structure, in which a composite beam is constructed at the same time by placing concrete directly on a steel beam. In constructing RC slabs on both sides of a steel beam as a boundary, both sides are flat deck plates having a plurality of stiffening ribs formed by bending the upper flat plate portion downward in the length direction. A mode in which an end closed flat deck plate having a rib lower surface position closed end portion formed by crushing a flat plate portion to the position of the lower surface of a stiffening rib at both ends in the longitudinal direction is spanned between the beams with the flat plate portion side facing up. An RC slab construction method for a building structure that constructs an RC slab that is raised with respect to the beam upper surface,
When placing concrete when constructing the RC slab,
An RC slab construction method for a building structure, in which a headed stud is welded and fixed to the upper surface of the steel beam in advance, and concrete is cast directly on the steel beam to simultaneously construct a composite beam.

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