CN108331365B - Method for reinforcing reinforced concrete floor by profiled steel sheet - Google Patents
Method for reinforcing reinforced concrete floor by profiled steel sheet Download PDFInfo
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- CN108331365B CN108331365B CN201810101584.XA CN201810101584A CN108331365B CN 108331365 B CN108331365 B CN 108331365B CN 201810101584 A CN201810101584 A CN 201810101584A CN 108331365 B CN108331365 B CN 108331365B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G23/0237—Increasing or restoring the load-bearing capacity of building construction elements of storey floors
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Abstract
The invention belongs to the field of building structure reinforcement, and particularly relates to a method for reinforcing a reinforced concrete floor by using profiled steel sheets. The reinforced concrete floor slab reinforced by the invention has no wet operation, less invasion to the net space of the structure and short construction period; because the wave crests and the wave troughs of the cross section of the profiled steel sheet are alternately expanded, the ratio of the moment of inertia of the cross section of the profiled steel sheet is larger, so that the rigidity of the reinforced concrete floor slab can be improved; the wave troughs of the reinforced profiled steel sheets are equivalent to longitudinal beams, so that the cross-sectional height of the reinforced concrete floor slab can be increased, and the bearing capacity of the reinforced concrete floor slab can be improved; the profiled steel sheet has good anti-seismic performance, so that the ductility and the seismic energy consumption performance of the reinforced concrete floor slab can be improved.
Description
Technical Field
The invention belongs to the field of building structure reinforcement, and particularly relates to a method for reinforcing a reinforced concrete floor by using profiled steel sheets.
Background
Due to the influence of factors such as chemical erosion, concrete deterioration, steel bar corrosion, defects in the construction process, laggard design standards, structural function change and the like, a large number of existing building structures cannot meet the current use requirement standards. In the prior art, the treatment of such building structures that have not met the current standards of use is carried out by dismantling the rebuild, and by repairing the rebuild, or by reinforcing the structure. However, the demolition and reconstruction method has high economic cost, long construction period and great social influence, and demolished building waste causes great harm to the environment, so that the method for enabling the building structure to meet the current requirements through maintenance and reinforcement is a preferable method.
The common reinforcing methods for reinforced concrete floor slabs include a section enlarging method, a sticking FRP reinforcing method, a sticking steel reinforcing method, an external prestressing method and other reinforcing methods. The method for increasing the cross section is to thicken the reinforced concrete floor slab, the increase of the self weight of the structure is large, the workload of on-site wet operation is large, the construction period is long, and the reinforced floor slab occupies much net space. The FRP bonding method and the bonded steel reinforcing method can improve the bearing capacity of the reinforced concrete floor slab, but the FRP is fragile, the bonding quality of the bonded steel is not easy to control, simultaneously, the concrete strength of the reinforced concrete compression area is not changed, and after the bonded FRP or steel plate reaches a certain limit, the reinforced concrete is in a fragile damage form in the reinforced concrete compression area, so that the two methods have limited improvement range on the bearing capacity of the reinforced concrete floor slab. The external prestress strengthening method needs tensioning equipment and an anchorage device, has a complex construction process and has the problem of higher control difficulty of prestress tensioning.
The profiled steel sheet has the advantages of light dead weight, high strength, high rigidity, good earthquake resistance and the like, and is very convenient to transport, store, stack, load and unload.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a method for reinforcing a reinforced concrete floor by using profiled steel sheets.
The technical scheme of the invention is realized as follows: a method for reinforcing a reinforced concrete floor by using profiled steel sheets comprises the steps of the reinforced concrete floor, an anchoring bolt and the profiled steel sheets, and comprises the following steps:
the method comprises the following steps: before construction, according to the specific requirements of bearing capacity, rigidity and anti-seismic performance required by a reinforced concrete floor slab, selecting the type of a profiled steel plate, designing the size of the profiled steel plate, and forming holes at wave crests of the profiled steel plate;
step two: removing the decorative layer and the whitewash layer in the removing area on the surface of the reinforced concrete floor until the coarse aggregate and the fine aggregate are exposed out of the reinforced concrete floor;
step three: during construction, a reinforced concrete floor is divided into zones, the divided zones serve as bonding anchoring zones, the width of each bonding anchoring zone is larger than that of each wave crest, and the wave crests of the profiled steel sheets are adhered to the bonding anchoring zones;
step four: punching holes at the positions of the bonding anchoring areas corresponding to the holes on the wave crests to form drilled holes;
step five: and (4) passing the anchoring bolt through the opening of the wave crest and installing the anchoring bolt in the drill hole, so that the profiled steel sheet is fastened on the reinforced concrete floor.
Wherein, the range of the removing area in the second step is equal to the bonding anchoring area.
The ratio of the width of the wave crest to the width of the wave trough of the profiled steel sheet is less than 1: 1.
The diameter of each anchor bolt is larger than 6mm, and the clear distance between every two adjacent anchor bolts is not smaller than 20 mm.
And in the third step, the wave crests of the profiled steel sheet are adhered to the adhesive anchoring area by adopting a steel adhering and reinforcing method.
And fifthly, implanting the anchoring bolt into the drill hole by adopting a bar planting construction process.
The reinforced concrete floor slab reinforced by the invention has no wet operation, less invasion to the net space of the structure and short construction period; moreover, the wave crests and the wave troughs of the cross section of the profiled steel sheet are alternately expanded, so that the inertia moment ratio of the cross section of the profiled steel sheet is larger, and the rigidity of the reinforced concrete floor slab can be improved; the wave troughs of the reinforced profiled steel sheets are equivalent to longitudinal beams, so that the cross-sectional height of the reinforced concrete floor slab can be increased, and the bearing capacity of the reinforced concrete floor slab can be improved; the profiled steel sheet has good anti-seismic performance, so that the ductility and the seismic energy consumption performance of the reinforced concrete floor slab can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of the present invention.
1 reinforced concrete floor, 2 paste anchor area, 3 drilling, 4 anchor bolts, 5 profiled steel sheet, 6 wave crests.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example 1: as shown in fig. 1, a unidirectional floor of a building is reinforced, the thickness of the reinforced concrete floor to be reinforced is 100mm, the thickness of the protective layer is 20mm, the strength grade of concrete is C20, and the arrangement of the stressed steel bars is phi 6@ 200. The reinforcement design requires that the bending resistance bearing capacity is improved by more than 20 percent, the bending rigidity is improved by more than 10 percent, and the seismic performance is superior to that of the structure before reinforcement.
The invention is used for reinforcing the reinforced concrete floor (1), and the construction steps are as follows:
the method comprises the following steps: according to the relevant requirements of the profiled steel plates in the constructional files of the steel and concrete combined floor (house) cover structure with the atlas number of 05SG522, the profiled steel plates 5 supported at two sides are selected according to the type of Q235 steel, the wall thickness of the profiled steel plates 5 is 1mm, the width of the wave crest 6 is 150mm, holes are longitudinally formed in the middle of the wave crest 6, the hole diameter is 6mm, and the net distance between every two adjacent holes is 25 mm;
step two: removing the decorative layer and the whitewash layer in the removing area on the surface of the reinforced concrete floor slab 1, wherein the width of the removing area is 160mm until the coarse aggregate and the fine aggregate are exposed in the removing area;
step three: during construction, the clearing area in the step two is used as a bonding anchoring area 2, and a wave crest 6 of the profiled steel sheet 5 is bonded at the bonding anchoring area 2 by a bonding steel reinforcing method;
step four: punching holes at the positions, corresponding to the holes on the wave crests 6, of the bonding anchoring areas 2 to serve as drilled holes 3, wherein the hole diameters of the drilled holes 3 are 6 mm;
step five: the anchor bolts 4 are implanted into the drill holes 3 by adopting a bar planting construction process, so that the profiled steel sheet 5 is fastened on the reinforced concrete floor slab 1.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (2)
1. The method for reinforcing the reinforced concrete floor by the profiled steel sheet comprises the reinforced concrete floor (1), the anchor bolts (4) and the profiled steel sheet (5), and is characterized by comprising the following steps:
the method comprises the following steps: before construction, according to the specific requirements of bearing capacity, rigidity and anti-seismic performance required by the reinforced concrete floor (1), selecting the type of the profiled steel plate (5), designing the size of the profiled steel plate (5), and forming holes at wave crests (6) of the profiled steel plate (5);
step two: removing the decorative layer and the whitewash layer in the surface removal area of the reinforced concrete floor (1) until the coarse aggregate and the fine aggregate are exposed out of the reinforced concrete floor (1);
step three: during construction, a reinforced concrete floor (1) is divided into zones, the divided zones serve as bonding anchoring zones (2), the width of each bonding anchoring zone (2) is larger than that of each wave crest (6), and the wave crests (6) of the profiled steel sheets (5) are adhered to the bonding anchoring zones (2);
step four: punching holes at the positions of the bonding anchoring areas (2) corresponding to the holes on the wave crests (6) to form drilled holes (3);
step five: the anchor bolt (4) penetrates through the opening of the wave crest (6) and is arranged in the drill hole (3), so that the profiled steel sheet (5) is fastened on the reinforced concrete floor (1);
the ratio of the width of the wave crest to the width of the wave trough of the profiled steel sheet (5) is less than 1: 1;
the range of the clearing area in the second step is equal to that of the bonding anchoring area (2);
implanting the anchoring bolt (4) into the drill hole (3) by adopting a bar planting construction process;
the diameter of the anchor bolt (4) is larger than 6mm, and the clear distance between adjacent anchor bolts (4) is not smaller than 20 mm.
2. A method of reinforcing a reinforced concrete floor slab with profiled steel sheets as claimed in claim 1, wherein: and in the third step, the wave crest (6) of the profiled steel sheet (5) is fixedly adhered to the adhesive anchoring area (2) by adopting an adhesive steel reinforcing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810101584.XA CN108331365B (en) | 2018-02-01 | 2018-02-01 | Method for reinforcing reinforced concrete floor by profiled steel sheet |
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| CN201810101584.XA CN108331365B (en) | 2018-02-01 | 2018-02-01 | Method for reinforcing reinforced concrete floor by profiled steel sheet |
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| CN108331365A CN108331365A (en) | 2018-07-27 |
| CN108331365B true CN108331365B (en) | 2021-02-23 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109339338B (en) * | 2018-09-28 | 2021-04-06 | 浙江大学宁波理工学院 | Reinforcing structure of square steel column |
| CN110674454B (en) * | 2019-10-24 | 2023-05-26 | 同济大学建筑设计研究院(集团)有限公司 | Simplified calculation method for flexural bearing capacity of bonded steel reinforced prestressed concrete beam |
| CN111255256A (en) * | 2020-01-22 | 2020-06-09 | 同济大学建筑设计研究院(集团)有限公司 | Construction method for anti-bending reinforced floor slab structure |
| CN111719885B (en) * | 2020-03-21 | 2021-10-26 | 东莞市大乘建筑工程技术有限公司 | Laminated concrete reinforced floor and construction process |
| CN112431436B (en) * | 2020-12-14 | 2022-10-21 | 东莞理工学院 | Anti-punching reinforcement construction method for flat slab |
| CN113309378B (en) * | 2021-05-24 | 2022-10-11 | 中建钢构武汉有限公司 | Support structure, floor support plate construction system and method |
| CN113530050A (en) * | 2021-08-17 | 2021-10-22 | 上海市建筑科学研究院有限公司 | Corrugated steel plate reinforced orthogonal laminated wood composite floor slab and manufacturing method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2607538A1 (en) * | 1986-11-28 | 1988-06-03 | Lelan Jean Claude | Device for repairing, or "restoring", shell-type roofs |
| CN101245668A (en) * | 2008-03-11 | 2008-08-20 | 李唐宁 | Construction method for two-side reinforcing engineering structure |
| CN105442860A (en) * | 2015-11-16 | 2016-03-30 | 重庆大学 | Method for reinforcing reinforced concrete coupling beam through corrugated steel plate assemblies |
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2018
- 2018-02-01 CN CN201810101584.XA patent/CN108331365B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2607538A1 (en) * | 1986-11-28 | 1988-06-03 | Lelan Jean Claude | Device for repairing, or "restoring", shell-type roofs |
| CN101245668A (en) * | 2008-03-11 | 2008-08-20 | 李唐宁 | Construction method for two-side reinforcing engineering structure |
| CN105442860A (en) * | 2015-11-16 | 2016-03-30 | 重庆大学 | Method for reinforcing reinforced concrete coupling beam through corrugated steel plate assemblies |
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