CN115234025A - Concrete floor thickening construction method - Google Patents
Concrete floor thickening construction method Download PDFInfo
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- CN115234025A CN115234025A CN202210855965.3A CN202210855965A CN115234025A CN 115234025 A CN115234025 A CN 115234025A CN 202210855965 A CN202210855965 A CN 202210855965A CN 115234025 A CN115234025 A CN 115234025A
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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
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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
-
- 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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- Chemical Kinetics & Catalysis (AREA)
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- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention provides a concrete floor thickening construction method, which belongs to the technical field of building structure construction and comprises the following steps: firstly, the method comprises the following steps: removing live loads from the reinforcement member; II, secondly: chiseling new and old combination parts of the beam, the plate and the column, and chiseling small pits on the combination surfaces; thirdly, the method comprises the following steps: implanting transverse steel bars and longitudinal steel bars into a support, implanting one end of each haunching steel bar into a floor slab, and implanting the other end of each haunching steel bar into the support; fourthly, the method comprises the following steps: implanting the tie bars into the existing floor slab, and pulling the longitudinal bars and the transverse bars by the hooks of the tie bars; fifthly: forming a horn pouring opening on the floor slab, and forming a plurality of vibrating openings around the horn pouring opening; sixthly, the method comprises the following steps: erecting a formwork support, installing a formwork, coating a separant on the formwork, flushing the formwork with water before pouring concrete, and cleaning up sundries in the formwork without water accumulation in the formwork; step seven: and (5) pouring concrete. It has solved the not enough problem of concrete floor bearing capacity among the prior art.
Description
Technical Field
The invention relates to the technical field of building structure construction, in particular to a concrete floor thickening construction method.
Background
At present, a cast-in-place reinforced concrete floor is a floor manufactured by formwork erecting, reinforcing steel bar binding, concrete pouring, maintenance and template removal on site according to a design position. The concrete floor has the characteristics of firmness, durability, good fireproof performance and low cost.
In the actual construction process, after the concrete floor slab is poured, the bearing capacity is not enough, the bearing capacity needs to be improved by increasing the thickness of the floor slab, and the structural shock resistance, the integrity, the appearance quality, the simplicity and the easiness in construction and the like need to be considered. Therefore, a concrete floor thickening construction method is provided to solve the above-mentioned problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a concrete floor thickening construction method, which solves the problem of insufficient bearing capacity of the concrete floor in the prior art.
According to the embodiment of the invention, the concrete floor thickening construction method comprises the following steps:
the method comprises the following steps: removing the live load acting on the reinforcement member;
step two: chiseling new and old combination parts of beams, plates and columns, and chiseling small pits for planting tie bars on the combination surfaces;
step three: implanting transverse steel bars and longitudinal steel bars into a support, implanting one end of each haunching steel bar into a floor slab, and implanting the other end of each haunching steel bar into the support;
step four: implanting the tie bars into the floor slab in a quincuncial arrangement mode, wherein the hooks of the tie bars pull the longitudinal bars and the transverse bars;
step five: forming a horn pouring opening on the floor slab, and forming a plurality of vibrating openings around the horn pouring opening;
step six: erecting a formwork support, installing a formwork, coating an isolating agent on the formwork, flushing the formwork with water before pouring concrete, cleaning impurities in the formwork, and drying accumulated water in the formwork;
step seven: and (5) pouring concrete.
Compared with the prior art, the invention has the following beneficial effects: through the chiseling treatment at the bottom of the existing floor slab, the mode of steel bar implanting glue is adopted, longitudinal steel bars, transverse steel bars and haunching steel bars are implanted into a support beside the existing floor slab, tie steel bars are implanted into the existing floor slab in a plum blossom arrangement mode, newly-added longitudinal steel bars and transverse steel bars are pulled by hooks, horn pouring openings and vibrating openings are formed in the existing floor slab, a formwork support is erected, templates are installed, and concrete for reinforcement is poured, so that the steel bar implanting anti-pulling force is high, the integrity of new and old structures is high, the requirement for the appearance quality of the concrete is high, and the purposes of increasing the thickness of the floor slab and improving the bearing capacity of the floor slab are achieved.
Drawings
FIG. 1 is a cross-sectional view of the present invention;
fig. 2 is a plan view of the present invention.
In the drawings, wherein: 1. longitudinal reinforcing steel bars; 2. transverse reinforcing steel bars; 3. tying the reinforcing steel bars; 4. adding armpit reinforcing steel bars; 5. casting a horn opening; 6. a vibrating port; 7. a mould frame is supported; 8. a template; 9. concrete for reinforcement; 10. a support; 11. and (7) a floor slab.
Detailed Description
The technical solution of the present invention is further explained with reference to the drawings and the embodiments.
The invention provides an embodiment, as shown in fig. 1 and fig. 2, a concrete floor thickening construction method comprises the following steps:
the method comprises the following steps: taking measures to unload or mostly unload the used live load acting on the reinforcing member, wherein the measures can be unloading by adopting a jacking mode, the beams bearing uniformly distributed loads are jacked uniformly at multiple points, for the main beam with the function of the secondary beam, a jack is arranged below each secondary beam, and the jacking loading is subject to the condition that the dead weight of the structure can be balanced and no crack occurs;
step two: roughening the new and old combination parts of the beam, the plate and the column, for example, digging pockmarks and grooves, wherein the depth: the columns are not less than 6mm, the beams are not less than 8mm, the number of pits in the area of every 100mm multiplied by 100mm is not less than 5, the distance between the grooves is not more than 200mm, and small pits for planting newly-added tie bars 3 in a plum blossom-shaped long strip shape are dug on the combination surface of the combination part;
step three: the transverse steel bars 2 and the longitudinal steel bars 1 are implanted into a support 10, one end of each haunching steel bar 4 is implanted into an existing floor 11, the other end of each haunching steel bar is implanted into the support 10, the implantation depth of each steel bar is not less than 15 times of the diameter of the steel bar, and the diameter and the distance between the steel bars are determined through design calculation;
step four: the tie bars 3 are implanted into the existing floor slabs 11 in a quincuncial arrangement mode, the distance of the quincuncial arrangement in the embodiment is twice that of the floor slabs 11, the hooks of the tie bars 3 pull the longitudinal bars 1 and the transverse bars 2, and the tie bars 3 also play a role in shearing resistance;
step five: the method comprises the following steps that horn pouring openings 5 are formed in an existing floor 11, wherein the diameter of each horn pouring opening 5 is not larger than the distance between reinforcing steel bars of the existing floor 11, a plurality of vibrating openings 6 are formed in the periphery of each horn pouring opening 5, the positions of holes are away from the reinforcing steel bars of the existing floor 11, the number and the range of the holes are determined according to the area of the floor 11 to be thickened, and the distance between the vibrating openings 6 is generally not larger than 1m so as to ensure that grouting is dense and new and old concrete can be reliably combined;
step six: erecting a formwork support 7, wherein the parameters of the formwork support 7 are obtained by calculation according to the erected height and the length-width ratio, installing a template 8, and avoiding staining joints of steel bars and concrete when a separant of the template 8 is coated; slurry cannot leak from the inner seams of the templates 8; before concrete is poured, the formwork 8 is washed by water, sundries in the formwork 8 need to be cleaned, but no water is accumulated in the formwork 8;
step seven: and (5) pouring concrete.
By adopting the construction method, the bottom of the existing floor 11 is chiseled, the longitudinal steel bars 1, the transverse steel bars 2 and the haunching steel bars 4 are implanted into the nearby supports 10 (beams and columns) in a steel bar planting and injecting mode, the tie steel bars 3 are implanted into the existing floor 11 in a quincunx arrangement mode, the hooks of the tie steel bars 3 pull the newly-added longitudinal steel bars 1 and the transverse steel bars 2, then the horn pouring openings 5 and the vibrating openings 6 are formed in the existing floor 11, the formwork support 7 is erected, the formwork 8 is installed, and the reinforcing concrete 9 is poured, so that the requirements of high pulling resistance of the steel bars, high integrity of the new and old structures and high appearance quality of the concrete are met, and the purposes of increasing the thickness of the floor 11 and improving the bearing capacity of the floor 11 are achieved.
In another embodiment of the present invention, one embodiment of the concrete 9 for reinforcement is mainly given, specifically, the concrete 9 for reinforcement is all micro-expansive concrete, aluminum powder is not used as an expanding agent of the concrete, and the maximum particle size of coarse aggregate in the concrete is not more than 20mm.
In another embodiment of the present invention, which mainly shows another embodiment of the concrete for reinforcement 9, when it is difficult to pour by using micro-expansive concrete, fine aggregate concrete is used, the water-cement ratio is not more than 0.4, and the slump is preferably 40 to 60mm.
In another embodiment of the present invention, which mainly provides another specific implementation of the concrete 9 for reinforcement, when the construction with fine aggregate concrete is still difficult, the concrete is reinforced by using the CGM340 series grouting material; the rubber hammer is used for knocking the bottom of the template 8 while pouring, and the concrete pouring is guaranteed to be compact.
In another embodiment of the invention, in order to improve the construction effect, the concrete requirements are mainly put on the drilling in the whole construction process, and particularly,
1) Before drilling, the weakening influence of the drilling hole on the section of the component is considered, and measures such as supporting or unloading are taken for unsafe components.
2) When the condition of the steel bar inside the component is measured, the stressed steel bar inside the component is avoided, the existing steel bar is strictly prevented from being damaged, if the steel bar collides with the steel bar inside the component, and the drilling hole is properly adjusted according to the condition.
3) After the hole is formed, dust in the hole is removed by a nylon brush or a steel brush, particles are blown clean by oilless compressed air, and finally the hole channel is wiped by acetone until the dust is completely removed, and the hole channel is kept dry.
4) After the rust removal treatment of the anchoring part of the reinforcing steel bar or the anchor bolt, the reinforcing steel bar or the anchor bolt is wiped by acetone to remove oil stains and powder scraps.
In another embodiment of the invention, in order to improve the construction effect, the concrete requirements are mainly provided for the bar planting construction, and in particular,
1) Before drilling the bar planting hole, the position of the steel bar of the column (or beam) should be scanned to avoid accidentally damaging the existing steel bar of the column (or beam), and the anchoring length of the steel bar planting hole specifies the construction drawing of each component.
2) Injecting the adhesive into the hole, simultaneously wrapping the anchoring part of the reinforcing steel bar with the adhesive, slowly placing the reinforcing steel bar into the hole, and extruding air in the hole, or adopting pressure pouring adhesive and manual pouring adhesive.
3) And (3) adopting a corresponding method according to different application forms and directions of the adhesive to carry out a drawing test on the planted steel bar.
4) When the steel bar is planted, the steel bar is welded and then planted, if the steel bar is difficult to be welded and needs to be welded, the welding point is more than 15d times of the diameter of the steel bar from the surface of the base material concrete and is not less than 200mm, and meanwhile, a wet towel soaked by ice water is adopted to wrap the root of the exposed part of the steel bar.
5) Before the bar planting is cured, curing and curing are carried out according to curing conditions provided by manufacturers, and disturbance is strictly prohibited before the curing is finished.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A concrete floor thickening construction method is characterized by comprising the following steps:
the method comprises the following steps: removing the live load acting on the reinforcement member;
step two: chiseling new and old combination parts of beams, plates and columns, and chiseling small pits for planting tie bars (3) on the combination surfaces;
step three: implanting transverse steel bars (2) and longitudinal steel bars (1) into a support (10), implanting one end of each haunching steel bar (4) into a floor slab (11), and implanting the other end of each haunching steel bar into the support (10);
step four: the tie bars (3) are implanted into the floor slab (11) in a quincuncial arrangement mode, and hooks of the tie bars (3) pull the longitudinal bars (1) and the transverse bars (2);
step five: a horn pouring opening (5) is formed in the floor slab (11), and a plurality of vibrating openings (6) are formed in the periphery of the horn pouring opening (5);
step six: erecting a formwork support (7), installing a template (8), coating an isolating agent on the template (8), washing the template (8) with water before pouring concrete, cleaning up impurities in the template (8), and drying accumulated water in the template (8);
step seven: and (5) pouring concrete.
2. The concrete floor slab thickening construction method according to claim 1, wherein in the step one, the whole or part of live load is removed by jacking, the beams bearing uniformly distributed load are jacked uniformly at multiple points, a jack is arranged below each secondary beam for the main beam with the function of the secondary beam, and the jacking loading is based on the condition that the self weight of the structure can be balanced and no crack occurs.
3. A concrete floor thickening construction method according to claim 1 or 2, wherein a pockmark and a groove are dug in the roughening treatment in the second step, and the small pits are chiseled in a quincunx shape.
4. A concrete floor thickening construction method according to claim 1, wherein in step seven, the reinforcing concrete (9) is micro-expansive concrete, and aluminum powder is not used as an expanding agent for the concrete.
5. A concrete floor thickening construction method according to claim 1, wherein in step seven, the reinforcing concrete (9) is fine stone concrete having a water-cement ratio of not more than 0.4 and a slump of 40 to 60mm.
6. A concrete floor thickening construction method according to claim 1, wherein in step seven, the reinforcing concrete (9) is reinforced by using CGM340 series grouting material, and the bottom of the formwork (8) is hammered by a rubber hammer while pouring.
7. A concrete floor thickening construction method according to claim 1, wherein drilling is performed throughout the construction method as follows:
1) Supporting or unloading unsafe components before drilling;
2) Measuring the condition of reinforcing steel bars in the component to avoid stressed reinforcing steel bars in the component;
3) After the hole is formed, dust in the hole is removed by a brush, powder particles are blown clean by compressed air, and finally the hole channel is wiped by acetone until the dust is completely removed, and the hole channel is kept dry;
4) After the rust removal treatment of the anchoring part of the reinforcing steel bar or the anchor bolt, the reinforcing steel bar or the anchor bolt is wiped by acetone to remove oil stains and powder scraps.
8. A concrete floor thickening construction method according to claim 1, wherein the steel bars are planted in the whole construction method according to the following requirements:
1) Scanning the position of a column or beam steel bar before drilling a steel bar planting hole;
2) Injecting an adhesive into the hole, simultaneously fully wrapping the anchoring part of the steel bar with the adhesive, slowly placing the steel bar into the hole, and extruding air in the hole;
3) Carrying out a drawing test on the planted steel bars;
4) When the steel bar is planted, the steel bar is welded and then planted, if the steel bar is difficult to weld and needs to be welded later, the distance between a welding point and the surface of the base material concrete is more than 15 times of the diameter of the steel bar, and meanwhile, a wet towel soaked by ice water is adopted to wrap the root of the exposed part of the steel bar;
5) And (5) carrying out curing and curing by bar planting.
9. A concrete floor thickening method according to claim 3, wherein the depth of the pits and grooves: the number of the columns is not less than 6mm, the number of the beams is not less than 8mm, the number of the pockmarks is not less than 5 per 100mm multiplied by 100mm, and the distance between every two grooves is not more than 200mm.
10. A concrete floor thickening construction method according to claim 3, wherein the depth of implantation of each reinforcing bar in step three is not less than 15 times the diameter of the reinforcing bar, and the depth of implantation of the tie bar (3) in step four is not less than 10 times the diameter of the reinforcing bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210855965.3A CN115234025A (en) | 2022-07-20 | 2022-07-20 | Concrete floor thickening construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210855965.3A CN115234025A (en) | 2022-07-20 | 2022-07-20 | Concrete floor thickening construction method |
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| CN115234025A true CN115234025A (en) | 2022-10-25 |
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| CN202210855965.3A Pending CN115234025A (en) | 2022-07-20 | 2022-07-20 | Concrete floor thickening construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116044204A (en) * | 2023-02-17 | 2023-05-02 | 中国矿业大学 | Method for reinforcing concrete floor slab with seriously rusted steel bar |
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| CN214835036U (en) * | 2021-05-24 | 2021-11-23 | 北京城建六建设集团有限公司 | Beam bottom reinforcing structure |
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2022
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| CN107217865A (en) * | 2017-06-20 | 2017-09-29 | 中冶建工集团有限公司 | A kind of increasing reinforced construction method of the flat beam section of main body frame |
| CN206942194U (en) * | 2017-07-07 | 2018-01-30 | 金川集团股份有限公司 | One kind is without support beam floor ruggedized construction |
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| CN116044204A (en) * | 2023-02-17 | 2023-05-02 | 中国矿业大学 | Method for reinforcing concrete floor slab with seriously rusted steel bar |
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