CN113152760A - Concrete bidirectional laminated slab with exposed slab net frame at bottom - Google Patents
Concrete bidirectional laminated slab with exposed slab net frame at bottom Download PDFInfo
- Publication number
- CN113152760A CN113152760A CN202110277395.XA CN202110277395A CN113152760A CN 113152760 A CN113152760 A CN 113152760A CN 202110277395 A CN202110277395 A CN 202110277395A CN 113152760 A CN113152760 A CN 113152760A
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- China
- Prior art keywords
- net rack
- slab
- steel bars
- laminated slab
- concrete
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
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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
- E04B5/32—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
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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
- H02G3/0456—Ladders or other supports
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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
- E04B2103/00—Material constitution of slabs, sheets or the like
- E04B2103/02—Material constitution of slabs, sheets or the like of ceramics, concrete or other stone-like material
Abstract
The invention discloses a concrete bidirectional laminated slab with a slab bottom exposed out of a slab net rack, and belongs to the technical field of buildings. Comprises a laminated slab bottom plate and post-cast concrete. The laminated slab bottom plate consists of a concrete layer, longitudinal stressed steel bars, transverse stressed steel bars and a flat plate net rack. The longitudinal stress steel bars and the transverse stress steel bars are respectively parallel to the transverse direction and the longitudinal direction of the bottom plate of the laminated slab. The flat net rack is arranged below the laminated slab and exposed out of the concrete layer. According to the invention, the flat-plate net rack is arranged below the bottom plate, so that the strength and rigidity of the laminated slab are effectively improved, the thickness of the laminated slab is reduced, and the purposes of saving materials and saving expenses are achieved. Meanwhile, the laminated slab is high in bearing capacity, and a midspan support is not required to be arranged during construction, so that the construction steps are simplified, and the construction efficiency is increased. Under the normal use state, the flat net rack does not need to be dismantled, and the stress of the laminated slab is continuously assisted, so that the concrete layer is pressed in a large area, the generation of cracks is reduced, the durability is improved, and the concrete laminated slab has good economic benefit and engineering value.
Description
Technical Field
The invention relates to the technical field of building structures, in particular to a concrete bidirectional laminated slab applied to a slab-bottom exposed flat-plate net rack of an assembled reinforced concrete building.
Background
In recent years, as the traditional construction mode gradually shows various defects in the aspects of environment, economy, efficiency and the like, such as more wet operation on site, low construction efficiency, great environmental pollution and the like, the country is beginning to vigorously develop the fabricated building. Among them, the laminated floor slab is an indispensable part of the fabricated building, and has drawn attention from people due to the characteristics of many times of use and wide application range.
The composite floor slab consists of a composite slab bottom plate and a post-cast concrete layer. The base plate of the laminated plate is generally a concrete member and is prefabricated in a factory. During construction, the bottom plate of the laminated slab serves as a bottom template of the post-cast concrete layer, and the effect of reducing construction steps is achieved. Meanwhile, the laminated plate bottom plate has certain strength and rigidity and is used for bearing the self weight, the weight of post-cast concrete and construction load. The post-cast concrete layer fully combines the precast concrete bottom plate and the beam together, so that the building integrity is improved, and the post-cast concrete layer and the precast composite slab bottom plate bear force and bear load together. Compared with prefabricated slabs, the laminated floor slab has better integrity and stronger shock resistance; compared with a cast-in-place slab, the composite floor slab saves materials, has short construction period, is green and environment-friendly, and meets the development requirement of building industrialization.
At present, the laminated floor slab industry is rapidly developed, and various laminated floor slabs represented by PK prestressed concrete laminated floor slabs, reinforced truss concrete laminated floor slabs and profiled steel sheet-concrete combined floor slabs appear. However, the technology of laminated floor slabs is far from mature, and the existing laminated floor slabs have many problems:
the PK prestressed concrete composite floor slab bottom plate is an inverted T-shaped prefabricated ribbed thin plate, ribs are arranged on four sides of the slab bottom, and holes are formed in the concrete rib parts. In a factory, the laminated floor slab has the problems of complex production and manufacturing, low manufacturing efficiency, poor product quality and the like, and cannot be produced on a large scale. During construction, the hole needs to be penetrated with ribs transversely, the site construction operation is difficult, and the assembly speed is slow.
The steel bar truss welded in advance is embedded in the bottom plate of the steel bar truss concrete composite floor slab, and the strength and the rigidity of the bottom plate are improved through the steel bar truss. But the steel bar trusses cannot provide enough strength and rigidity to the bottom plate, so that the bottom plate still needs to meet the specification requirements by increasing the plate thickness. The thickness of the bottom plate on the market is at least 60mm, and the thickness of the laminated plate formed by pouring is generally about 120mm, so that materials are wasted, and the weight of the floor is increased. During on-site assembly, the bottom plate needs to be provided with a plurality of supports at the bottom of the plate due to lower strength and rigidity, and the construction speed is greatly reduced.
The profiled steel sheet-concrete composite floor slab takes a profiled thin steel sheet as a bottom plate and also as a template, steel bars are arranged in a cast-in-place layer, and then post-cast concrete is poured. The profiled steel sheet-concrete composite floor slab is difficult to be applied to a concrete structure, has high manufacturing cost, needs to consider the anti-corrosion and fireproof treatment of the profiled steel sheet in the construction and use stages, and is relatively labor-consuming, expensive and time-consuming.
In addition, the existing laminated slab bottom plate is mostly provided with 'ribs' for assisting stress on the upper part of the laminated slab bottom plate, so that the compression capacity of concrete and the tension capacity of reinforcing steel bars cannot be fully utilized, and the strength and the rigidity of the laminated slab bottom plate are low, and the plate thickness is large.
In view of the above, it is necessary to develop a novel laminated floor panel with economic benefits and assembly speed.
Disclosure of Invention
Aiming at the problems, the invention provides a concrete bidirectional laminated slab with a flat net rack exposed at the bottom, which can effectively solve the problems of low assembly speed, high manufacturing cost, poor bearing capacity and the like of the existing laminated slab.
In order to realize the purpose of the invention, the following technical scheme is adopted: a concrete bidirectional laminated slab with a flat net rack exposed at the bottom comprises post-cast concrete and a laminated slab bottom plate.
The laminated slab bottom plate is composed of a concrete layer, longitudinal stress steel bars, transverse stress steel bars and a flat plate net rack. Wherein, the longitudinal stress steel bar and the transverse stress steel bar in the concrete layer symmetrically extend out of the bottom plate of the laminated slab. The flat net rack is arranged below the concrete layer and exposed out of the concrete layer.
The flat-plate net rack is welded on the longitudinal stress reinforcing steel bars and the transverse stress reinforcing steel bars and consists of net rack web member reinforcing steel bars, net rack lower chord connecting reinforcing steel bars and net rack lower chord reinforcing steel bars. The net rack lower chord steel bar is parallel to the long edge of the bottom plate of the laminated slab and is connected with the longitudinal stress steel bar and the transverse stress steel bar through the net rack web member steel bar. The net rack lower chord connecting steel bars are parallel to the short edge of the bottom plate of the laminated slab and connect the net rack lower chord steel bars into a flat net rack.
The invention has the beneficial effects that:
1. the invention provides a concrete bidirectional laminated slab with a flat net rack exposed at the bottom of the slab, and provides a novel stress mode, namely a truss mode. The flat plate net rack is arranged on the lower side of the plate bottom, so that a large area of tension of a concrete layer is avoided, the generation of cracks is reduced, and the durability of the concrete layer is improved.
2. The concrete bidirectional laminated slab with the plate bottom exposed flat net rack provided by the invention has the advantages that in the normal use stage, the flat net rack with the plate bottom exposed does not need to be detached, and is continuously used as a stress member to assist the laminated slab in bearing force.
3. Compared with the traditional laminated slab, the concrete bidirectional laminated slab with the slab bottom exposed out of the slab net rack has the advantage that the thickness of the prefabricated slab is smaller. Meanwhile, the flat net rack exposed at the bottom of the plate can be used as a support of an electromechanical pipeline, so that the upper space of the laminated slab is saved, the thickness of post-cast concrete is reduced, and the purposes of saving materials and saving expenses are achieved.
4. The concrete bidirectional laminated slab with the plate bottom exposed out of the flat net rack is formed by welding the flat net rack through the steel bars, does not need a special mould when pouring the bottom plate, is simple to manufacture and is convenient for industrial mass production.
5. The concrete bidirectional laminated slab with the slab bottom exposed flat grid frame provided by the invention has higher strength and rigidity. During construction, a midspan support does not need to be arranged, and the deflection of the midspan support can meet the standard requirement, so that the construction steps are simplified, and the construction efficiency is increased.
6. The two-way concrete laminated slab with the slab bottom exposed flat grid provided by the invention is provided with the stress reinforcing steel bars in two directions, and compared with a one-way slab, the slab thickness can be further reduced.
Drawings
FIG. 1 is a schematic view of a laminated panel according to the present invention;
FIG. 2 is a top view of a prefabricated floor panel of the present invention;
FIG. 3 is a bottom view of the prefabricated base plate of the present invention;
FIG. 4 is a side view of the long side of a prefabricated base panel of the present invention;
FIG. 5 is a side view of the short side of a prefabricated floor panel of the present invention;
FIG. 6 is a detailed view of the flat screen frame of the present invention;
in the figure: post-cast concrete 1, a laminated slab bottom plate 2, a concrete layer 201, a longitudinal stress steel bar 202, a transverse stress steel bar 203, a flat-plate net rack 204, net rack web member steel bars 2041, net rack lower chord connecting steel bars 2042 and net rack lower chord steel bars 2043.
Detailed Description
The present invention is further illustrated by the following examples, but it should not be construed that the scope of the above-described subject matter is limited to the following examples. Various alterations and modifications can be made without departing from the technical idea of the invention, and all changes and modifications made by the ordinary technical knowledge and the conventional means in the field are intended to be included in the scope of the invention.
The embodiment discloses a two-way superimposed sheet of concrete of dull and stereotyped rack is exposed to bottom of a board, including post-cast concrete 1 and superimposed sheet bottom plate 2. The size of the laminated plate bottom plate 2 is 2400mm multiplied by 1200mm, and the thickness is 40 mm. The thickness of the post-cast concrete 1 is 50mm, and the total thickness of the laminated slab is 90 mm.
Referring to fig. 2, 3 and 5, the laminated slab bottom plate 2 is composed of a concrete layer 201, longitudinal stressed steel bars 202, transverse stressed steel bars 203 and a flat plate net rack 204. Wherein, the longitudinal stress steel bar 202 in the concrete layer 201 is parallel to the long side of the laminated slab bottom plate 2, and the transverse stress steel bar 203 is parallel to the short side of the laminated slab bottom plate 2. The longitudinal stress steel bar 202 and the transverse stress steel bar 203 symmetrically extend out of the bottom plate at two ends. The flat net rack 204 is disposed below the concrete layer 201 and exposed to the concrete layer 201.
Referring to fig. 3 and 6, the flat-plate net rack 204 is welded on the longitudinal stressed steel bars 202 and the transverse stressed steel bars 203, and is composed of net rack web members 2041, net rack lower chord connecting steel bars 2042 and net rack lower chord steel bars 2043. The net rack lower chord reinforcing steel bar 2043 is parallel to the long edge direction of the laminated plate bottom plate 2 and is connected with the longitudinal stress reinforcing steel bar 202 and the transverse stress reinforcing steel bar 203 through the net rack web member reinforcing steel bar 2041. The net rack lower chord connecting steel bars 2042 are parallel to the short side direction of the bottom plate 2 of the laminated slab, and a plurality of net rack lower chord steel bars 2043 are connected into the flat net rack 204.
In this embodiment, the height of the slab net rack 204 is 100mm, the distance between the longitudinal stress steel bar 202 and the transverse stress steel bar 203 is 150mm, the distance between the web members 2041 of the adjacent equidirectional net racks is 300mm, and the distance between the lower chord connecting steel bars 2042 of the adjacent net racks is 300 mm.
The laminated board base plate 2 disclosed in this embodiment is manufactured by inversion. That is, in the manufacturing, the top surface of the laminated floor 2 is placed at the lower side, and the flat plate rack 204 is placed at the upper side.
The specific manufacturing steps are as follows:
1. a plurality of net rack web member reinforcing steel bars 2041 and net rack lower chord reinforcing steel bars 2043 are welded into a flat plate net rack foundation unit, and then are connected by net rack lower chord connecting reinforcing steel bars 2042 to form a flat plate net rack 204.
2. Erecting a formwork, and arranging longitudinal stress steel bars 202 and transverse stress steel bars 203 in the formwork. And welding the flat-plate net rack 204 manufactured in the previous step on the longitudinal stress steel bars 202 and the transverse stress steel bars 203.
3. And pouring concrete, and curing according to standard conditions.
The concrete bidirectional laminated slab with the slab bottom exposing slab net rack disclosed by the embodiment comprises the following concrete construction steps:
1. an end support is provided at the lower part of the laminated slab.
2. The prefabricated laminated slab bottom plate 2 in a factory is hoisted to the elevation of the construction surface, electromechanical pipelines are laid above or below the laminated slab bottom plate 2, reinforcing steel bars are bound, and necessary templates are erected.
3. And pouring the post-cast concrete 1, and removing the support when the post-cast concrete 1 reaches the specified strength.
Claims (4)
1. The utility model provides a two-way superimposed sheet of concrete of dull and stereotyped rack is exposed to board bottom which characterized in that: the concrete bidirectional laminated slab with the flat net rack exposed at the bottom comprises post-cast concrete (1) and a laminated slab bottom plate (2);
the laminated slab bottom plate (2) is composed of a concrete layer (201), longitudinal stress steel bars (202), transverse stress steel bars (203) and a flat net rack (204); two ends of a longitudinal stress steel bar (202) and a transverse stress steel bar (203) in the concrete layer (201) symmetrically extend out of the laminated slab bottom plate (2); the flat net rack (204) is arranged below the concrete layer (201) and is exposed out of the concrete layer (201);
the flat-plate net rack (204) is welded on the longitudinal stress reinforcing steel bars (202) and the transverse stress reinforcing steel bars (203) and consists of net rack web member reinforcing steel bars (2041), net rack lower chord connecting reinforcing steel bars (2042) and net rack lower chord reinforcing steel bars (2043); the net rack lower chord steel bars (2043) are parallel to the long edges of the bottom plates (2) of the laminated slabs and are connected with the longitudinal stress steel bars (202) and the transverse stress steel bars (203) through net rack web member steel bars (2041); net rack lower chord connecting steel bars (2042) are parallel to the short side of the bottom plate (2) of the laminated slab, and a plurality of net rack lower chord steel bars (2043) are connected into a flat-plate net rack (204).
2. The concrete bidirectional laminated slab of the slab bottom exposed slab net rack according to claim 1, wherein: the length and the width of the laminated slab bottom plate (2) are 2400-3600mm, and the thickness is 35-60 mm; the height of the flat net rack (4) is 50-150mm, and the thickness of the post-cast concrete (1) is 50-60 mm; the thickness of the laminated plate is 85mm-120 mm.
3. The concrete bidirectional laminated slab of the slab bottom exposed slab net rack according to claim 1, wherein: when in factory manufacturing, the laminated slab bottom plate (2) is manufactured in an inverted mode, namely, the flat-plate net rack (204) is arranged above the laminated slab bottom plate (2); during site construction, the laminated slab bottom plate (2) is placed on the two side supports in the positive direction.
4. The concrete bidirectional laminated slab of the slab bottom exposed slab net rack according to claim 1, wherein: in the installation stage of the laminated slab, the flat-plate net rack (204) is pulled, and the concrete layer (201) is pressed; during normal use conditions, the tablet net mount (204) does not need to be removed and continues to act as a force-bearing member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110277395.XA CN113152760A (en) | 2021-03-15 | 2021-03-15 | Concrete bidirectional laminated slab with exposed slab net frame at bottom |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110277395.XA CN113152760A (en) | 2021-03-15 | 2021-03-15 | Concrete bidirectional laminated slab with exposed slab net frame at bottom |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113152760A true CN113152760A (en) | 2021-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110277395.XA Pending CN113152760A (en) | 2021-03-15 | 2021-03-15 | Concrete bidirectional laminated slab with exposed slab net frame at bottom |
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| Country | Link |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109518864A (en) * | 2017-09-19 | 2019-03-26 | 王海 | A kind of inversion steel bar girder concrete folding plate and its construction method |
| CN212104574U (en) * | 2020-04-17 | 2020-12-08 | 徐州工业职业技术学院 | Floor board and shear wall corner steel construction for assembly type building |
-
2021
- 2021-03-15 CN CN202110277395.XA patent/CN113152760A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109518864A (en) * | 2017-09-19 | 2019-03-26 | 王海 | A kind of inversion steel bar girder concrete folding plate and its construction method |
| CN212104574U (en) * | 2020-04-17 | 2020-12-08 | 徐州工业职业技术学院 | Floor board and shear wall corner steel construction for assembly type building |
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Application publication date: 20210723 |
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| WD01 | Invention patent application deemed withdrawn after publication |