CN110512783B - Floor structure composed of cast-in-place concrete frame beam and concrete composite floor slab - Google Patents
Floor structure composed of cast-in-place concrete frame beam and concrete composite floor slab Download PDFInfo
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- CN110512783B CN110512783B CN201910207370.5A CN201910207370A CN110512783B CN 110512783 B CN110512783 B CN 110512783B CN 201910207370 A CN201910207370 A CN 201910207370A CN 110512783 B CN110512783 B CN 110512783B
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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
- E04B5/17—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
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Abstract
The invention relates to a floor structure composed of a cast-in-place concrete frame beam and a concrete composite floor slab, which comprises: concrete frame beams and concrete composite floor slabs; the concrete coincide floor bottom is prefabricated layer, upper portion and is the cast-in-place layer of concrete, wherein: when the concrete frame beam is connected with the concrete composite floor slab, the prefabricated layer of the composite floor slab and the concrete frame beam are separated by a seam in the range of 1.5 times of the height of the frame beam at the beam end, and the steel bar of the prefabricated layer of the composite floor slab does not extend out of the slab edge in the separation range of the seam, and the prefabricated layer of the composite floor slab and the cast-in-place layer are connected with the concrete frame beam by arranging the additional steel bar at the interface of the prefabricated layer of the composite floor slab; when the concrete frame beam is connected with the concrete composite floor slab, the composite floor slab prefabricated layer and the concrete frame beam are overlapped and placed in a range beyond the beam height of 1.5 times of the beam end, and in the overlapping and placing range, the reinforcing steel bars of the composite floor slab prefabricated layer stretch into the concrete frame beam to be connected. The invention improves the overall earthquake-resistant performance of the building structure and meets the conceptual design requirement of 'strong columns and weak beams'.
Description
Technical Field
The invention belongs to the field of constructional engineering, and particularly relates to a floor structure consisting of a cast-in-place concrete frame beam and a concrete composite floor slab.
Background
The assembly type building has the advantages of energy conservation, environmental protection, high efficiency, high quality and the like, meets the requirement of building industrialization, and is rising; currently, fabricated buildings are in the blowout development stage. Through project practice, after rational thinking and summary, the existing fabricated building still has a plurality of problems: compared with the traditional building structure, the construction and transportation cost is high, the vertical bearing and lateral force resisting members (such as frame columns and shear walls) are mainly spliced by adopting grouting sleeves and other modes, potential safety hazards and earthquake resistance defects exist, the integrity is inferior to that of a cast-in-place structure, the earthquake resistance is poor, and the like. After the earthquake of Wenchuan in 2008 and the earthquake of Yushu in 2010, the requirements of our country on the aspect of building structure earthquake-resistant standards are continuously improved, and the hidden danger or defect of the prefabricated building in the aspect of earthquake resistance obviously runs counter to the situation. The laminated floor slab is used as a main component of an assembly type building, and the thickness of the laminated floor slab is larger than that of a cast-in-place structure slab due to the construction structure and the prefabrication rate, so that the bearing capacity of a frame beam connected with the laminated floor slab is super strong, and the requirement of an anti-seismic design concept of a strong column and a weak beam of a building structure can not be really realized.
Disclosure of Invention
In order to improve the anti-seismic performance of the fabricated building and meet the requirement of a building structure of 'strong column and weak beam', the invention provides a floor system structure consisting of a cast-in-place concrete frame beam and a concrete composite floor slab.
In order to achieve the purpose, the invention adopts the following technical scheme:
the superstructure structure that constitutes by cast-in-place concrete frame roof beam and concrete coincide floor includes: concrete frame beams and concrete composite floor slabs; the concrete frame beam is integrally cast and connected with the concrete frame column; the concrete coincide floor bottom is for having the prefabricated layer of certain thickness, and prefabricated layer upper portion is the cast-in-place layer of concrete, wherein: when the concrete frame beam is connected with the concrete composite floor slab, the prefabricated layer of the composite floor slab and the concrete frame beam are separated by a seam in the range of 1.5 times of the height of the frame beam at the beam end, and the steel bar of the prefabricated layer of the composite floor slab does not extend out of the slab edge in the separation range of the seam, and the prefabricated layer of the composite floor slab and the cast-in-place layer are connected with the concrete frame beam by arranging the additional steel bar at the interface of the prefabricated layer of the composite floor slab; when the concrete frame beam is connected with the concrete composite floor slab, the composite floor slab prefabricated layer and the concrete frame beam are overlapped and placed in a range beyond the beam height of 1.5 times of the beam end, and in the overlapping and placing range, the reinforcing steel bars of the composite floor slab prefabricated layer stretch into the concrete frame beam to be connected.
Preferably, the width of the parting seam is 5-10mm, the foam strips are filled at the seam-removing position, and the resting depth is 10-15 mm.
Preferably, the prefabricated layer is internally provided with truss steel bars, and the prefabricated layer of the composite floor slab is connected with the cast-in-situ layer of the composite floor slab through the truss steel bars.
Preferably, the laminated floor cast-in-place layer and the concrete frame beam are provided with reinforcing steel bars of the laminated floor cast-in-place layer in the full-length range of the concrete frame beam and are connected in a whole pouring manner; the length of the steel bar of the cast-in-place layer of the composite floor slab extending into the concrete frame beam needs to meet the anchoring requirement.
Preferably, the length of the additional steel bar extending into the cast-in-place layer of the composite floor slab from the interface of the prefabricated layer of the composite floor slab and the cast-in-place layer meets the requirement of anchoring, and the length of the additional steel bar extending into the concrete frame beam meets the requirement of not less than 5 times the diameter of the additional steel bar extending into the interface of the prefabricated layer of the composite floor slab and the cast-in-place layer and the requirement of extending through the center line of the concrete; the number of the additional reinforcing steel bars at the interface of the prefabricated layer of the composite floor slab and the cast-in-place layer is the same as that of the reinforcing steel bars of the prefabricated layer in the corresponding range.
Preferably, the length of the beam extending into the concrete frame beam is required to meet the requirement that the length of the beam extending into the concrete frame beam is not less than 5 times of the diameter of the steel bar of the prefabricated layer of the laminated floor slab and the length of the beam extending into the center line of the concrete frame beam.
The construction method of the floor system structure consisting of the cast-in-place concrete frame beam and the concrete composite floor slab comprises the following steps:
(1) producing a composite floor precast layer, and determining the plane size according to the requirements that the composite floor precast layer is separated from the side parting of the cast-in-place frame beam within the range of 1.5 times the height of the frame beam and is overlapped and placed with the cast-in-place frame beam outside the range of 1.5 times the height of the frame beam; arranging the prefabricated layer steel bars of the laminated floor according to the requirements that the steel bars of the laminated floor do not extend out of the plate edges within the parting and releasing range and the steel bars of the laminated floor extend out of the plate edges within the overlapping and laying range;
(2) building a floor beam plate supporting system on a construction site;
(3) binding frame columns and frame beam steel bars according to the requirements of a design construction drawing and a related design drawing set;
(4) hoisting the composite floor precast layer, accurately positioning to ensure that the composite floor precast layer is separated from the side parting of the frame beam within the range of 1.5 times the height of the frame beam, and simultaneously, the composite floor precast layer is overlapped with the frame beam outside the range of 1.5 times the height of the frame beam for placement;
(5) setting additional steel bars at the interface of the prefabricated layer of the composite floor slab and the cast-in-place layer, wherein the length of the cast-in-place layer extending into the composite floor slab needs to meet the requirement of anchoring length, and the length of the frame beam extending into the frame beam needs to meet the requirement that the diameter of the steel bars is not less than 5 times and the steel bars extend through the center line of the frame beam;
(6) binding the steel bars of the cast-in-place layer of the composite floor slab according to the requirements of the design construction drawing and the related design drawing set;
(7) the concrete frame column and the concrete frame beam template are sealed;
(8) foam strips are arranged at the parting and separating positions of the prefabricated layers of the laminated floor slabs and the frame beams, so that slurry leakage during concrete pouring is prevented;
(9) and pouring concrete to complete the floor structure consisting of the concrete frame beams and the laminated floor slab.
Compared with the prior art, the invention has the following beneficial effects: the overall seismic performance of the building structure is improved, the three-level seismic fortification target of 'no damage of small earthquake, repairable middle earthquake and no fall of large earthquake' is realized, energy consumption components (frame beams and shear wall connecting beams) in the building structure need to be yielded before frame columns and shear walls under the action of an earthquake, and plastic hinges are formed at first. In order to ensure that energy dissipation of energy dissipation components such as frame beams and the like is really realized under the action of an earthquake, the earthquake-proof design needs to realize three aspects of 'strong columns and weak beams, strong nodes and weak components, and strong shear and weak bending'. The conventional cast-in-place concrete beam-slab floor structure often cannot form a plastic hinge at first due to the super strong action of the floor slab on the frame beam, namely cannot meet the requirement of 'strong columns and weak beams'. The invention effectively weakens the super-strong effect of the floor slab on the end of the frame beam through the reasonable structure that the four corners of the prefabricated layer of the laminated floor slab are connected with the concrete frame beam within a certain range. Therefore, the building structure can generate plastic hinges at the end of the frame beam according to a preset path under the action of an earthquake, the conceptual design requirement of a strong column and a weak beam is met, and the overall earthquake-resistant performance of the building structure is greatly improved.
Drawings
Fig. 1 is a schematic plan view of a floor structure composed of cast-in-place concrete frame beams and concrete composite floor slabs;
fig. 2A is a schematic sectional view taken along line a-a of a floor structure composed of a cast-in-place concrete frame beam and a concrete composite floor slab;
FIG. 2B is a schematic cross-sectional view of the floor structure formed by the cast-in-place concrete frame beam and the concrete composite floor slab;
in the figure: 1. concrete frame beam, 2, concrete composite floor slab, 3, concrete frame column, 4, composite floor slab prefabricated layer, 5, composite floor slab cast-in-place layer, 6, composite floor slab prefabricated layer reinforcing steel bars, 7, composite floor slab prefabricated layer truss reinforcing steel bars, 8, composite floor slab cast-in-place layer reinforcing steel bars, 9, composite floor slab prefabricated layer and cast-in-place layer interface additional reinforcing steel bars, 10 and foam strips.
Detailed Description
As shown in fig. 1, 2A and 2B, the floor structure formed by cast-in-place concrete frame beams and concrete composite floor slabs includes: the concrete frame beam 1 and the concrete composite floor slab 2; the concrete frame beam 1 is integrally cast and connected with the concrete frame column 3; the bottom layer of the concrete composite floor slab 2 is a prefabricated layer 4 with a certain thickness, the upper part of the prefabricated layer 4 is a concrete cast-in-place layer 5, a truss reinforcing steel bar 7 is arranged in the prefabricated layer, and the composite floor slab prefabricated layer 4 is connected with the composite floor slab cast-in-place layer 5 through the truss reinforcing steel bar 7; wherein:
when the concrete frame beam 1 is connected with the concrete composite floor slab 2, the composite floor slab prefabricated layer 4 and the concrete frame beam 1 are separated in a seam in the range of 1.5 times of the frame beam height at the beam end, the seam width is 5-10mm, and foam strips 10 are filled at the separated seam separation positions; in the parting throw-off range, coincide floor prefabricated layer reinforcing bar 6 does not stretch out the flange limit, is connected with cast-in-place layer interface additional reinforcement 9 and concrete frame roof beam 1 through setting up coincide floor prefabricated layer, wherein: the length of the additional steel bar 9 at the interface of the prefabricated layer of the composite floor slab and the cast-in-place layer, which extends into the cast-in-place layer 5 of the composite floor slab, meets the anchoring requirement, and the length of the additional steel bar 9 which extends into the concrete frame beam 1 meets the requirement that the diameter of the additional steel bar 9 at the interface of the prefabricated layer of the composite floor slab and the cast-in-place layer is not less than 5 times and the additional steel bar needs to extend; the number of the additional reinforcing steel bars 9 at the interface of the prefabricated layer of the composite floor slab and the cast-in-place layer is the same as that of the reinforcing steel bars 6 of the prefabricated layer in the corresponding range.
When the concrete frame beam 1 is connected with the concrete composite floor slab 2, the composite floor slab prefabricated layer 4 and the concrete frame beam 1 are overlapped and placed in a range which is 1.5 times of the beam height of the beam end, and the placing depth is 10-15 mm; in the overlapping range, the steel bars 6 of the prefabricated layer of the composite floor slab stretch into the concrete frame beam 1 for connection, and the length of the steel bars 6 of the prefabricated layer of the composite floor slab stretching into the concrete frame beam 1 needs to meet the requirement that the diameter of the steel bars 6 of the prefabricated layer of the composite floor slab is not less than 5 times and the steel bars need to stretch through the center line of the concrete frame beam 1.
When the concrete frame beam 1 is connected with the concrete composite floor slab 2, the composite floor slab cast-in-place layer 5 and the concrete frame beam 1 are provided with the composite floor slab cast-in-place layer reinforcing steel bars 8 in the full-length range of the concrete frame beam 1 and are connected in a whole pouring way; the length of the steel bar 8 of the cast-in-place layer of the composite floor slab extending into the concrete frame beam 1 needs to meet the anchoring requirement.
The construction method of the floor system structure consisting of the cast-in-place concrete frame beam and the concrete composite floor slab comprises the following steps:
(1) producing a composite floor precast layer 4, and determining the plane size according to the requirements that the composite floor precast layer 4 is separated from the side parting of the cast-in-place frame beam 1 within the range of 1.5 times the height of the frame beam and is overlapped and placed with the cast-in-place frame beam 1 outside the range of 1.5 times the height of the frame beam; arranging the prefabricated layer steel bars 6 of the composite floor slab according to the requirements that the steel bars 6 of the composite floor slab do not extend out of the plate edges within the parting and releasing range and the steel bars 6 of the composite floor slab extend out of the plate edges within the overlapping and laying range;
(2) building a floor beam plate supporting system on a construction site;
(3) binding the frame column 3 and the frame beam 2 steel bars according to the design construction drawing and the related design drawing set;
(4) hoisting the composite floor precast layer 4, accurately positioning to ensure that the composite floor precast layer 4 is separated from the side parting of the frame beam within the range of 1.5 times the height of the frame beam, and is overlapped with the frame beam outside the range of 1.5 times the height of the frame beam;
(5) setting an additional steel bar 9 at the interface of the prefabricated layer of the composite floor slab and the cast-in-place layer, wherein the length of the cast-in-place layer 5 extending into the composite floor slab needs to meet the requirement of anchoring length, and the length of the cast-in-place layer 1 extending into the frame beam needs to meet the requirement that the diameter of the steel bar 9 is not less than 5 times and the length of the steel bar extends through the central line of the;
(6) binding the steel bars 8 of the cast-in-place layer of the composite floor slab according to the requirements of the design construction drawing and the related design drawing set;
(7) the concrete frame column 3 and the concrete frame beam 2 are made of a closed concrete frame column template;
(8) the foam strips 10 are arranged at the parting and separating positions of the prefabricated layer 4 of the composite floor slab and the frame beam 1, so that slurry leakage during concrete pouring is prevented;
(9) and pouring concrete to complete the floor structure consisting of the concrete frame beams and the laminated floor slab. .
Claims (5)
1. A floor structure composed of cast-in-place concrete frame beams and concrete composite floor slabs comprises: the concrete frame beam and the concrete composite floor slab are integrally cast and connected; the bottom layer of the concrete composite floor slab is a prefabricated layer with a certain thickness, and the upper part of the prefabricated layer is a concrete cast-in-place layer; the method is characterized in that: the laminated floor slab prefabricated layer and the concrete frame beam are separated in a seam separation range within the height range of the frame beam 1.5 times of the beam end, the reinforcing steel bars of the laminated floor slab prefabricated layer do not extend out of the slab edges in the seam separation range, and the laminated floor slab prefabricated layer and the cast-in-place layer are connected with the concrete frame beam through the arrangement of the additional reinforcing steel bars at the interface of the laminated floor slab prefabricated layer and the cast-in-place layer; overlapping the prefabricated layer of the composite floor slab and the concrete frame beam in a range beyond 1.5 times of the beam height of the beam end, wherein in the overlapping range, reinforcing steel bars of the prefabricated layer of the composite floor slab extend into the concrete frame beam for connection; arranging a reinforcing steel bar of the laminated floor cast-in-place layer in the full-length range of the concrete frame beam and connecting the laminated floor cast-in-place layer and the concrete frame beam in a whole pouring way; the length of the steel bar of the cast-in-place layer of the composite floor slab extending into the concrete frame beam needs to meet the requirement that the diameter of the steel bar of the prefabricated layer of the composite floor slab is not less than 5 times and the steel bar needs to extend through the center line of the concrete frame beam.
2. A floor structure consisting of cast-in-place concrete frame beams and concrete composite floor slabs as claimed in claim 1, wherein: the width of the parting seam is 5-10mm, the seam-removing part is filled with foam strips, and the laying depth is 10-15 mm.
3. A floor system structure consisting of cast-in-place concrete frame beams and concrete composite floor slabs as claimed in claim 1 or 2, wherein: the prefabricated layer is internally provided with truss reinforcing steel bars, and the prefabricated layer of the composite floor slab is connected with the cast-in-place layer of the composite floor slab through the truss reinforcing steel bars.
4. A floor structure consisting of cast-in-place concrete frame beams and concrete composite floor slabs as claimed in claim 3, wherein: the length of the additional reinforcing steel bar extending into the cast-in-place layer of the composite floor slab needs to meet the anchoring requirement, and the length of the additional reinforcing steel bar extending into the concrete frame beam needs to meet the requirement that the diameter of the additional reinforcing steel bar extending into the interface of the composite floor slab precast layer and the cast-in-place layer is not less than 5 times of the diameter of the additional reinforcing steel bar extending into the interface of the composite floor slab precast layer and the cast-in-; the number of the additional reinforcing steel bars at the interface of the prefabricated layer of the composite floor slab and the cast-in-place layer is the same as that of the reinforcing steel bars of the prefabricated layer in the corresponding range.
5. A method of constructing a floor system according to any one of claims 1 to 4, comprising the steps of:
(1) producing a composite floor precast layer, and determining the plane size according to the requirements that the composite floor precast layer is separated from the side parting of the cast-in-place frame beam within the range of 1.5 times the height of the frame beam and is overlapped and placed with the cast-in-place frame beam outside the range of 1.5 times the height of the frame beam; arranging the prefabricated layer steel bars of the laminated floor according to the requirements that the steel bars of the laminated floor do not extend out of the plate edges within the parting and releasing range and the steel bars of the laminated floor extend out of the plate edges within the overlapping and laying range;
(2) building a floor beam plate supporting system on a construction site;
(3) binding frame columns and frame beam steel bars according to the requirements of a design construction drawing and a related design drawing set;
(4) hoisting the composite floor precast layer, accurately positioning to ensure that the composite floor precast layer is separated from the side parting of the frame beam within the range of 1.5 times the height of the frame beam, and simultaneously, the composite floor precast layer is overlapped with the frame beam outside the range of 1.5 times the height of the frame beam for placement;
(5) setting additional steel bars at the interface of the prefabricated layer of the composite floor slab and the cast-in-place layer, wherein the length of the cast-in-place layer extending into the composite floor slab needs to meet the requirement of anchoring length, and the length of the frame beam extending into the frame beam needs to meet the requirement that the diameter of the steel bars is not less than 5 times and the steel bars extend through the center line of the frame beam;
(6) binding the steel bars of the cast-in-place layer of the composite floor slab according to the requirements of the design construction drawing and the related design drawing set;
(7) the concrete frame column and the concrete frame beam template are sealed;
(8) foam strips are arranged at the parting and separating positions of the prefabricated layers of the laminated floor slabs and the frame beams, so that slurry leakage during concrete pouring is prevented;
(9) and pouring concrete to complete the floor structure consisting of the concrete frame beams and the laminated floor slab.
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| CN201910207370.5A CN110512783B (en) | 2019-03-19 | 2019-03-19 | Floor structure composed of cast-in-place concrete frame beam and concrete composite floor slab |
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| CN201910207370.5A CN110512783B (en) | 2019-03-19 | 2019-03-19 | Floor structure composed of cast-in-place concrete frame beam and concrete composite floor slab |
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| CN110512783B true CN110512783B (en) | 2020-09-08 |
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| CN111058562A (en) * | 2019-12-31 | 2020-04-24 | 浙江工业大学 | Laminated floor slab structure and construction process thereof |
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