KR20100012404A - Half pc slab having closed lib - Google Patents

Half pc slab having closed lib Download PDF

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Publication number
KR20100012404A
KR20100012404A KR1020080073769A KR20080073769A KR20100012404A KR 20100012404 A KR20100012404 A KR 20100012404A KR 1020080073769 A KR1020080073769 A KR 1020080073769A KR 20080073769 A KR20080073769 A KR 20080073769A KR 20100012404 A KR20100012404 A KR 20100012404A
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KR
South Korea
Prior art keywords
foam
bottom plate
rib
plate
present
Prior art date
Application number
KR1020080073769A
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Korean (ko)
Inventor
고수
황의민
Original Assignee
(주)콘솔베르
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Publication date
Application filed by (주)콘솔베르 filed Critical (주)콘솔베르
Priority to KR1020080073769A priority Critical patent/KR20100012404A/en
Publication of KR20100012404A publication Critical patent/KR20100012404A/en

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/17—Floor structures partly formed in situ
    • E04B5/18—Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly cast between filling members
    • E04B5/19—Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly cast between filling members the filling members acting as self-supporting permanent forms
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
    • E04B5/326—Floor structures wholly cast in situ with or without form units or reinforcements with hollow filling elements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
    • E04B5/36—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor
    • E04B5/38—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor with slab-shaped form units acting simultaneously as reinforcement; Form slabs with reinforcements extending laterally outside the element
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
    • E04C5/0604—Prismatic or cylindrical reinforcement cages composed of longitudinal bars and open or closed stirrup rods

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)

Abstract

The present invention relates to a half-ply bottom plate for a composite slab comprising a predetermined portion of the entire thickness of the slab as a precast concrete plate.

According to a preferred embodiment of the present invention, a flat plate portion having a thin plate shape, a plurality of rib portions integrally formed on an upper portion of the flat plate portion, a foam provided between the rib portions, and a rib covering the foam and positioned on the side of the foam Ribbed half, characterized in that the upper flange of the upper part of the parts connected to each other and closed, the foam is installed only in the longitudinal center portion of the rib portion, the foam is not installed so that both ends are formed pockets filled with cast-in-place concrete A PC bottom plate is provided.

Description

Half PC slab having Closed Lib}

The present invention relates to a half PC slab composed of a part of the entire thickness of the slab made of precast concrete (hereinafter referred to as "PC") plate and the concrete is cast on the top of the site. More particularly, the present invention relates to a ribbed half-ply bottom plate in which a plurality of ribs are integrally formed on an upper surface, a foam is filled between ribs located in a central portion in a longitudinal direction, and the rib upper surface is closed by forming an upper flange.

As the construction industry is made to order at the construction site, it is difficult to make the parts into parts, and even in the case of componentized parts, the mechanization and automation in the assembly and construction stages including transportation are difficult due to lack of equipment and experience. Productivity improvement is lower than that of other industries. In addition, the construction industry is a labor-intensive industry with lower labor productivity than the manufacturing industry, and the industrial accident rate is 3 to 5 times higher than that of other industries.

In order to solve these problems and reduce the overall construction cost through labor reduction, air reduction, and work safety, the prefabrication of the concrete, half-fiberization, the use of system formwork, the standardization of design construction, the rationalization of work and process management, etc. It is necessary to introduce new techniques. One of the methods that emerged with this background is the half-PC bottom plate method.

Half-PC bottom plate is a kind of composite bottom plate developed for the purpose of shortening the air and improving workability as an effective method that complements and complements the advantages of the complete PC method and the site casting method. Half-PC bottom plate almost uses formwork and copper bark by placing thin PC board over supporting members (beams, walls, etc.), placing the upper reinforcement on it, and then filling the remaining concrete, topping concrete, with site-casting concrete. It is a method that does not improve the structural performance and workability.

Half-PC bottom plates are known as truss reinforced, hollow and double tees.

The truss-reinforced half-ply bottom plate is made by embedding the lower chord of the truss reinforcement into a thin PCB with a thickness of 40 ~ 80mm and hardening it, and then half slab exposing the upper chord of the truss (omnier or Kaiser truss) and part of the web material. As a reinforcement on the site at the site, the site concrete is poured by integrating the bottom plate. The truss muscle also increases the flexural strength of the PCB until the cast-in-place concrete hardens.

Hollow half PC bottom plate refers to a prestressed concrete flat type half PC bottom plate having a continuous cavity inside the cross section. The thickness of the PCB is 7 ~ 30cm and prestress is introduced so that it can be used up to 10m span. The long-term deflection is extremely small, which is favorable for cracking, light weight and high bending strength.

Double T-type bottom plate bottom plate has a rib attached to the bottom of the flat PC plate, and its shape is like two T-shaped ribs. The bending moment is formed in the shape of the deck plate to improve the cross-sectional performance, so the resistance moment is increased during the construction.

These half-PC bottom plate has the following problems.

The truss reinforcement type half-ply bottom plate requires a separate truss fabrication facility, and the upper reinforcement work is inconvenient than the flat plate, and there is a risk of cracking during lifting. Hollow half-PC bottom plate has a problem when applied to a high-rise building because the height of the floor increases due to the increase in thickness. The double-tee type half-ply bottom plate has a problem in that the quantity of cast-in-place concrete is increased and the rib is protruded on the lower surface, thereby limiting the planar configuration.

The problem to be solved by the present invention is that it can be long span without increasing the thickness of the entire bottom plate, and there is no protrusion such as a beam on the lower surface is free of flat configuration and can improve the sound insulation and insulation performance without increasing its own weight It is possible to reduce the amount of cast-in-place concrete, and to provide a half-PC bottom plate with improved workability and usability.

According to a preferred embodiment of the present invention, a flat plate portion having a thin plate shape, a plurality of rib portions integrally formed on an upper portion of the flat plate portion, a foam provided between the rib portions, and a rib covering the foam and positioned on the side of the foam Ribbed half, characterized in that the upper flange of the upper part of the parts connected to each other and closed, the foam is installed only in the longitudinal center portion of the rib portion, the foam is not installed so that both ends are formed pockets filled with cast-in-place concrete A PC bottom plate is provided.

According to another suitable embodiment of the present invention, a wire mesh is embedded in the upper flange portion.

According to another suitable embodiment of the present invention, the rib is provided with reinforcing bars having hooks at the ends at regular intervals along the longitudinal direction thereof.

According to another suitable embodiment of the present invention, the foam consists of expanded polystyrene.

According to another suitable embodiment of the present invention, a shear coater is formed on the side of the rib portion located at the outermost side of the rib portion so that a groove is formed therebetween.

According to the present invention, the rib-filled rib top is connected by the upper flange to be closed, thereby improving workability and significantly reducing structural sag.

In addition, since the foam is filled between the ribs, it is possible to reduce the amount of cast-in-place concrete, and to be effective in the insulation and impact between floors, and can be effectively applied to the place requiring heat insulation.

In addition, since the beam shape does not protrude from the lower surface of the plate compared to the conventional double tee half-PC system, free planing is possible.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. In the drawings, the same components or parts are denoted by the same reference numerals as much as possible, and detailed descriptions of related known functions or configurations are omitted.

1 is a perspective view showing a ribbed half-ply bottom plate according to the present invention, Figure 2a is a cross-sectional view taken along the line A-A of Figure 1, Figure 2b is a cross-sectional view taken along the line B-B of FIG.

As shown, the ribbed half-ply bottom plate according to the present invention includes a flat plate portion 110 having a thin plate shape, a plurality of rib portions 120 integrally formed on an upper portion of the flat plate portion 110, and ribs. Foam 130 is provided between the portion 120 and the upper flange portion 140 for closing the foam 130 and the upper end of the rib portion 120 located on the side of the foam 130 to connect to each other to close. . At this time, the foam 130 is not installed at both ends in the longitudinal direction of the rib portion 120 is installed only in the center portion.

The flat plate 110 functions as a formwork for pouring concrete and is synthesized integrally with the overlay concrete to form a composite floor plate. Since the flat plate 110 is composed of a thin plate, the reinforcement or wire mesh 111 should be reinforced for flexural reinforcement, and is prestressed by arranging the tension member 112 composed of PS steel bars or PS steel wires to prevent long spans and cracks. Can be introduced.

The rib portion 120 is formed at a predetermined interval over the entire length in the longitudinal direction or the width direction of the plate portion 110 on the upper portion of the plate portion 110. Accordingly, the rib 120 may reinforce the rigidity of the flat plate 110 without significantly increasing its own weight so as to make the bottom plate long span. The cross-sectional shape is not limited to the rectangular shape shown, and may be formed in various cross-sectional shapes. Reinforcing bars 121 or steel wires corresponding to the tension force may be disposed in the rib part 120 to correspond to the upper tension due to the introduction of the prestress. Since the half-ply bottom plate is made of half the structural section, the structural behavior of the thin plate is inevitable and cracking may occur during demoulding, transporting, assembling, and casting concrete in the field. Therefore, the reinforcing problem of the plate member having the form of a thin plate is the biggest problem. These cracks in the PCB affect the bottom plate collapse and increase in deflection, so appropriate measures should be taken to prevent cracking. To this end, in the present invention, the rib portion 120 is formed on the upper surface of the flat plate portion 110 composed of a thin plate, and the rib portions 120 are connected to the upper flange portion 140 to be closed. In addition, the rib 120 is provided with reinforcing bars having hooks at the ends at regular intervals along the longitudinal direction thereof. The hook reinforcement 122 functions as a bilateral hook during the lifting of the bottom plate, and also enhances the composite effect with the overlaid concrete being cast in the field, and facilitates the reinforcement work of the upper plate.

The hollow portion between the rib portion 120 is filled with a foam 130 to increase the overall thickness of the bottom plate without reducing its own weight to reduce the amount of cast concrete. The foam 130 may be used in a variety of types that meet this purpose, for example, when using a foam polystyrene block can be expected effects such as insulation and sound insulation. At this time, the foam 130 is not installed at both ends of the bottom plate in the longitudinal direction to form a pocket 150 in which the cast-in-place concrete is filled in the hollow portion between the ribs 120. By using this pocket 150, it is possible to ensure the joint integrity of the beam-slab and the continuity of the slab.

The portion of the rib portion 120 in which the foam 130 is installed is closed by the upper flange portion 140. When pouring concrete directly on the upper surface of the foam 130 without forming the upper flange portion 140, there is a fear that the workability is significantly reduced depending on the type of the foam 130. That is, when foamed polystyrene (EPS) is applied to the foam 130, small grains constituting the foamed polystyrene may be scattered when the worker moves and by friction with the materials, and this problem is prevented when the upper flange portion 140 is formed. can do. In addition, as the rib part 120 is closed by the upper flange part 140, the amount of deflection of the half PC floor according to the present invention can be significantly reduced. The thickness of the upper flange portion 140 should be more than 30mm if the maximum size of the aggregate is 25mm in consideration of the finish and the latency. However, in order to reduce the thickness of the entire bottom plate, it is preferable to limit the maximum aggregate size to 20 mm or less and to make the thickness of the upper flange portion 140 about 25 to 30 mm. Meanwhile, since the foam 130 is installed in the hollow part between the rib parts 120, the upper flange part 140 is constrained by the compressive strength of 5 tf / m 2 (when deformation is 1%) as if it is a slab on an elastic foundation. Even without the use of the reinforcement, the upper flange portion 140 itself is expected to have no major problems with respect to the vertical load. However, it is desirable to install wire mesh in terms of the possibility of partial failure due to the inhomogeneity of the material and the transfer or distribution of flexural stress. The upper flange portion 140 may be previously formed at the same time as the plate portion 110 and the rib portion 120, or may be mounted on a precast concrete plate having only the plate portion 110 and the rib portion 120, and the foam 130. It can also be formed by casting after filling.

FIG. 3 is a schematic plan view of a ribbed half-ply bottom plate according to the present invention, and FIG. 4a is a cross-sectional view of a central portion (ribbed section) of the ribbed half-ply bottom plate according to the present invention, and FIG. It is sectional drawing of the edge part (solid section) of the ribbed half-pc bottom plate.

The construction method of the structure using the half-PC bottom plate according to the present invention configured as described above, after making the frame using the pillars, beams made of the PC member or the frame made of cast-in-place concrete, the half slab according to the invention on the beam After mounting, reinforcing the slab reinforcing bar, and then pouring the upper concrete.

Referring to FIG. 3, since pockets 150 are formed at both ends of the bottom plate mounted on the beam 10, the connecting reinforcement 160 is disposed in the pocket 150, and the cast-in-place concrete 20, the overcast concrete By placing), it is possible to secure the joint integrity of the beam and the slab, thereby effectively resisting the parent moment acting on the beam-slab joint.

On the other hand, as shown in Figures 4a, 4b, for joining between the bottom plate, the front side of the rib portion located on the outermost side of the rib portion 120 to form a shear coater 124 in the upper and lower grooves 126 therebetween. To be formed. And the grooves formed in the end of the adjacent bottom plate is formed in contact with each other is filled with concrete at the time of pouring concrete is bonded to each other. Since the joints of the PC structure have not been developed in a perfect general method in fabrication, assembly, and structure, various joining methods have been attempted to satisfy the performance required by each structure. A coater is installed and shear reinforcement is installed locally or entirely according to the size of the shear force to fill the concrete with grooves. Therefore, resistance to large warpage and shear is possible.

Although the present invention has been described above with reference to the drawings, the present invention is not limited to the embodiments and drawings disclosed herein, and various modifications may be made by those skilled in the art within the scope of the technical idea of the present invention. Can be done.

The following drawings, which are attached in this specification, illustrate the preferred embodiments of the present invention, and together with the detailed description thereof, serve to further understand the technical spirit of the present invention. It should not be construed as limited.

1 is a perspective view showing a ribbed half-PC bottom plate according to the present invention.

FIG. 2A is a cross-sectional view taken along the line A-A of FIG. 1.

FIG. 2B is a cross-sectional view taken along line B-B of FIG. 1.

3 is a unit plan view to which the ribbed half-PC bottom plate according to the present invention is applied.

4A is a cross-sectional view of a central portion (ribbed section) of a ribbed half-ply bottom plate according to the present invention.

4B is a cross-sectional view of an end (solid section) of the ribbed half-ply bottom plate according to the present invention.

Claims (5)

A flat plate portion having a thin plate shape, a plurality of rib portions integrally formed on the upper portion of the plate portion, a foam provided between the rib portions, and an upper end portion of the rib portions covering the foam and positioned on the side of the foam are connected to each other to be closed. An upper flange portion, The foam is installed only in the longitudinal center portion of the rib portion, ribbed half-PC bottom plate, characterized in that the foam is not installed to form pockets filled with in-cast concrete at both ends. According to claim 1, Ribbed half-PC bottom plate, characterized in that the wire mesh is embedded in the upper flange. According to claim 1, Ribbed half-PC bottom plate characterized in that the reinforcing bar reinforcement is formed at the end at a predetermined interval along the longitudinal direction. According to claim 1, Ribbed half-PC bottom plate, characterized in that the foam is composed of expanded polystyrene. According to claim 1, Ribbed half-PC bottom plate, characterized in that the groove is formed between the top and bottom of the rib portion located on the outermost side of the rib portion to form a groove therebetween.
KR1020080073769A 2008-07-28 2008-07-28 Half pc slab having closed lib KR20100012404A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101012321B1 (en) * 2010-11-15 2011-02-09 정도건설 주식회사 A inverted multi tee slab
KR101152270B1 (en) * 2012-02-02 2012-06-19 정원이엔씨(주) Precast concrete slab system for building which have long span and require high design load and construction method using this system
KR101220678B1 (en) * 2012-05-02 2013-01-10 서울시립대학교 산학협력단 Rib optimized slab
KR101502029B1 (en) * 2014-09-23 2015-03-12 주식회사 케이이씨 Precast concrete hollowness slab and manufacturing method for thereof
KR101506620B1 (en) * 2013-05-08 2015-03-27 주식회사 네비엔 Precast concrete slab and Precast concrete slab assembly
CN105442737A (en) * 2015-12-21 2016-03-30 河北安能绿色建筑科技有限公司 Novel composite heat insulation floor board and construction method thereof
KR101701416B1 (en) * 2016-07-14 2017-02-01 (주)에스앤씨산업 Precast Concrete Deck for Long-Span Slab and the Slab using it
KR102170635B1 (en) * 2019-04-18 2020-10-28 유재천 Libbed half PC slab
KR102280675B1 (en) * 2020-09-28 2021-07-23 유재천 Libbed half PC slab
KR102555884B1 (en) * 2022-01-17 2023-07-14 이종민 Slab structure with improved fire resistance using glass wool

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101012321B1 (en) * 2010-11-15 2011-02-09 정도건설 주식회사 A inverted multi tee slab
KR101152270B1 (en) * 2012-02-02 2012-06-19 정원이엔씨(주) Precast concrete slab system for building which have long span and require high design load and construction method using this system
KR101220678B1 (en) * 2012-05-02 2013-01-10 서울시립대학교 산학협력단 Rib optimized slab
KR101506620B1 (en) * 2013-05-08 2015-03-27 주식회사 네비엔 Precast concrete slab and Precast concrete slab assembly
KR101502029B1 (en) * 2014-09-23 2015-03-12 주식회사 케이이씨 Precast concrete hollowness slab and manufacturing method for thereof
CN105442737A (en) * 2015-12-21 2016-03-30 河北安能绿色建筑科技有限公司 Novel composite heat insulation floor board and construction method thereof
KR101701416B1 (en) * 2016-07-14 2017-02-01 (주)에스앤씨산업 Precast Concrete Deck for Long-Span Slab and the Slab using it
KR102170635B1 (en) * 2019-04-18 2020-10-28 유재천 Libbed half PC slab
KR102280675B1 (en) * 2020-09-28 2021-07-23 유재천 Libbed half PC slab
KR102555884B1 (en) * 2022-01-17 2023-07-14 이종민 Slab structure with improved fire resistance using glass wool

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