CN113090058A - Construction method for repairing and reinforcing old concrete - Google Patents
Construction method for repairing and reinforcing old concrete Download PDFInfo
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- CN113090058A CN113090058A CN202110291002.0A CN202110291002A CN113090058A CN 113090058 A CN113090058 A CN 113090058A CN 202110291002 A CN202110291002 A CN 202110291002A CN 113090058 A CN113090058 A CN 113090058A
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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
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention provides a construction method of an earth dam heightening impermeable geomembrane, which comprises the following steps: cleaning the surface to be repaired of the concrete building, removing all impurities and polishing to be smooth; cutting to obtain a carbon fiber plate with the shape and the size consistent with the shape and the size of the surface to be repaired of the concrete building, and then coating an epoxy resin adhesive to adhere the carbon fiber plate to the surface to be repaired of the concrete building; after standing for at least 24 hours, the epoxy adhesive is cured. By adopting the technical scheme of the invention, various impurities on the surface to be repaired of the concrete building are thoroughly removed, the mortar cushion layer and the epoxy resin adhesive can be fully contacted with the carbon fiber plate, impurities and bubbles in the mortar cushion layer and the epoxy resin adhesive are avoided, the epoxy resin adhesive is fully filled into the carbon fiber plate, the bonding quality, the bonding effect and the bonding strength are ensured, and the construction quality is improved.
Description
Technical Field
The invention belongs to the technical field of constructional engineering, and particularly relates to a construction method for repairing and reinforcing old concrete.
Background
Nowadays, concrete is widely applied to various buildings, and the concrete buildings (1) can crack after running for years due to load, temperature change, damp and hot circulation and a plurality of external cracks, so that potential harm is brought to the buildings, particularly prestressed concrete bridges. Most of the cracks appear on the bottom surfaces of box girder top plates, building bottom plates and the like, which affect the appearance of the building and are difficult to repair. In the prior art, the publication numbers are: the patent document "CN 104060533B" discloses a novel composite deck repair layer for concrete beam bridges. The bridge deck repairing layer comprises a carbon fiber plate reinforcing layer, an epoxy mortar layer and a pitch horse shoe grease gravel concrete paving layer; the carbon fiber plate reinforcing layer is formed by pressing high-strength carbon fibers and epoxy resin at high temperature; the epoxy mortar layer is formed by mixing epoxy resin and fine sand; the asphalt horseshoe resin gravel concrete pavement layer is an asphalt horseshoe resin gravel concrete layer. The technical scheme disclosed by the patent document fills up the loophole in the field of repairing and reinforcing concrete buildings to a certain extent, however, when the technical scheme provided by the patent document is used and an epoxy mortar layer is paved, air and dust in the external environment are easy to invade and mix in the loophole, so that the quality and the service life of the repairing layer are influenced.
Disclosure of Invention
In order to solve the technical problems, the invention provides a construction method for repairing and reinforcing old concrete.
The invention is realized by the following technical scheme.
The invention provides a construction method for repairing and reinforcing old concrete, which comprises the following steps:
the method comprises the following steps: cleaning the surface to be repaired of the concrete building, removing all impurities and polishing to be smooth;
step two: cutting to obtain a carbon fiber plate with the shape and the size consistent with the shape and the size of the surface to be repaired of the concrete building, and then coating an epoxy resin adhesive to adhere the carbon fiber plate to the surface to be repaired of the concrete building;
step three: after standing for at least 24 hours, curing the epoxy adhesive in the second step.
The construction method for repairing and reinforcing the old concrete further comprises the following steps: and in the process of the first step, washing the surface to be repaired of the concrete building by using a high-pressure water gun, and removing attached stains, mud residues and loose aggregates until the concrete aggregates are exposed.
And in the step one, the surface to be repaired of the concrete building is polished to be flat by an angle grinder.
In the step one, the cleaning range of the surface to be repaired of the concrete building is the range of 1cm to 2cm of the outward extension of the outer contour of the surface to be repaired of the concrete building.
The construction method for repairing and reinforcing the old concrete further comprises the following steps: and before the second step is carried out, a mortar cushion layer is smeared on the surface to be repaired of the concrete building.
The construction method for repairing and reinforcing the old concrete further comprises the following steps: and before the second step, cleaning the carbon fiber plate to remove all dust, oil stains or mud.
And in the second step, the coating thickness of the epoxy resin adhesive is 1mm to 2 mm.
The construction method for repairing and reinforcing the old concrete further comprises the following steps: and after finishing the second step and waiting for 30min, repeatedly rolling the carbon fiber plate along the fiber direction by using a drum brush for multiple times.
The construction method for repairing and reinforcing the old concrete further comprises the following steps: and in the third step, covering the carbon fiber plate with a plastic film.
The construction method for repairing and reinforcing the old concrete further comprises the following steps: and after the third step is finished, coating a mortar protective layer on the outer surface of the carbon fiber plate by using a spatula.
The invention has the beneficial effects that: by adopting the technical scheme of the invention, before repairing, the surface of the concrete building to be repaired is cleaned and washed repeatedly, various impurities on the surface of the concrete building to be repaired are thoroughly removed, the mortar cushion layer and the epoxy resin adhesive can be in full contact with the carbon fiber plate after polishing and flattening, impurities and bubbles in the mortar cushion layer and the epoxy resin adhesive are avoided, then, a drum brush is used for rolling repeatedly along the fiber direction of the carbon fiber plate, the bubbles in the mortar cushion layer and the epoxy resin adhesive are fully destroyed, the epoxy resin adhesive is fully filled into the carbon fiber plate, the bonding quality, the bonding effect and the bonding strength are ensured, in addition, the carbon fiber plate, the epoxy resin adhesive, the mortar cushion layer and the mortar protective layer with qualified performance indexes are screened in the repairing process, and the bonding quality is further ensured, The bonding effect and the bonding strength improve the construction quality.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1-concrete building, 2-carbon fiber plate, 3-epoxy resin adhesive, 4-mortar cushion layer and 5-mortar protective layer.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
As shown in fig. 1, the invention provides a construction method for repairing and reinforcing old concrete, which comprises the following steps:
the method comprises the following steps: cleaning the surface to be repaired of the concrete building 1, removing all impurities and polishing to be flat; in addition, in the process of the first step, a high-pressure water gun is used for washing the surface to be repaired of the concrete building 1, and attached stains, mud residues and loose aggregates are removed until the concrete aggregates are exposed. And in the step one, the surface to be repaired of the concrete building 1 is polished to be flat by an angle grinder. In the first step, the cleaning range of the surface to be repaired of the concrete building 1 is the range of the outer contour of the surface to be repaired of the concrete building 1 extending outwards by 1cm to 2 cm.
In addition, before the second step, a mortar cushion layer 4 is coated on the surface to be repaired of the concrete building 1. The mortar cushion layer 4 meets the following technical conditions: the adhesive strength is not less than 2MPa, the compressive strength is not less than 45MPa after being condensed for seven days, the compressive strength is not less than 59MPa after being condensed for twenty-eight days, the elastic modulus is not less than 20000MPa, and the fire-proof grade is A1 grade.
Step two: firstly, cutting to obtain a carbon fiber plate 2 with the shape and the size consistent with the shape and the size of the surface to be repaired of the concrete building 1, and then coating an epoxy resin adhesive 3 to adhere the carbon fiber plate to the surface to be repaired of the concrete building 1; further, it is preferable that the carbon fiber sheet 2 satisfies the following technical conditions: the density is 1.6g/cm3, the critical temperature of heat deformation resistance is more than 100 ℃, the fiber content is more than 68 percent, the elastic modulus is 210GPa, the tensile strength is more than 3.5GPa, and the shearing strength is not less than 12MPa along the arrangement direction of the fibers in the fiber. The epoxy resin adhesive 3 satisfies the following technical conditions: the adhesive strength is not less than 14MPa, the shear strength is not less than 12MPa, the compressive strength is not less than 30MPa, the expansion rate is not more than 0.1 percent, the elastic modulus is not less than 2000MPa, the thermal expansion coefficient is not more than 100 multiplied by 10 < -6 >, and the thermal deformation resistance critical temperature is not less than 40 ℃. The construction method for repairing and reinforcing the old concrete further comprises the following steps: before the second step, the carbon fiber plate 2 is cleaned to remove all dust, oil stains or mud. In the second step, the coating thickness of the epoxy resin adhesive 3 is 1mm to 2 mm.
Step three: after standing for at least 24 hours, the epoxy resin binder 3 in step two is cured. The construction method for repairing and reinforcing the old concrete further comprises the following steps: after completing step two and waiting for 30min, the carbon fiber sheet 2 was repeatedly rolled in the fiber direction using a drum brush several times. Thereby fully destroy the bubble in mortar bed course 4, the epoxy adhesive 3, make carbon fiber plate 2 can laminate completely, bond closely, carry out the in-process of step three, use plastic film to cover carbon fiber plate 2 to prevent that the rainwater from corroding, should avoid carbon fiber plate 2 to receive the impact simultaneously.
In addition, the construction method for repairing and reinforcing the old concrete further comprises the following steps: and after the third step is finished, coating a mortar protective layer 5 on the outer surface of the carbon fiber plate 2 by using a spatula. The mortar protection layer 5 preferably has a thickness of 2 mm. The mortar protective layer 5 meets the following technical conditions: the compressive strength is not less than 45N/mm2 after twenty-eight days of coagulation, and the bending strength is not less than 5N/mm after twenty-eight days of coagulation2The thermal expansion coefficient is 13X 10-6, and the fire rating is A2.
By adopting the technical scheme of the invention, before repairing, the surface of the concrete building to be repaired is cleaned and washed repeatedly, various impurities on the surface of the concrete building to be repaired are thoroughly removed, the mortar cushion layer and the epoxy resin adhesive can be in full contact with the carbon fiber plate after polishing and flattening, impurities and bubbles in the mortar cushion layer and the epoxy resin adhesive are avoided, then, a drum brush is used for rolling repeatedly along the fiber direction of the carbon fiber plate, the bubbles in the mortar cushion layer and the epoxy resin adhesive are fully destroyed, the epoxy resin adhesive is fully filled into the carbon fiber plate, the bonding quality, the bonding effect and the bonding strength are ensured, in addition, the carbon fiber plate, the epoxy resin adhesive, the mortar cushion layer and the mortar protective layer with qualified performance indexes are screened in the repairing process, and the bonding quality is further ensured, The bonding effect and the bonding strength improve the construction quality.
Claims (10)
1. The construction method for repairing and reinforcing the old concrete is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: cleaning the surface to be repaired of the concrete building (1), removing all impurities and polishing to be flat;
step two: firstly, cutting to obtain a carbon fiber plate (2) with the shape and the size consistent with the shape and the size of the surface to be repaired of the concrete building (1), and then coating an epoxy resin adhesive (3) to adhere the carbon fiber plate to the surface to be repaired of the concrete building (1);
step three: after standing for at least 24h, curing the epoxy resin adhesive (3) in the second step.
2. The construction method for repairing and reinforcing old concrete according to claim 1, wherein: the construction method for repairing and reinforcing the old concrete further comprises the following steps: and in the process of the step one, washing the surface to be repaired of the concrete building (1) by using a high-pressure water gun, and removing attached stains, mud residues and loose aggregates until the concrete aggregates are exposed.
3. The construction method for repairing and reinforcing old concrete according to claim 1, wherein: in the step one, the surface to be repaired of the concrete building (1) is polished to be flat by an angle grinder.
4. The construction method for repairing and reinforcing old concrete according to claim 1, wherein: in the first step, the cleaning range of the surface to be repaired of the concrete building (1) is the range of the outer contour of the surface to be repaired of the concrete building (1) extending outwards by 1cm to 2 cm.
5. The construction method for repairing and reinforcing old concrete according to claim 1, wherein: the construction method for repairing and reinforcing the old concrete further comprises the following steps: before the second step, a mortar cushion layer (4) is coated on the surface to be repaired of the concrete building (1).
6. The construction method for repairing and reinforcing old concrete according to claim 1, wherein: the construction method for repairing and reinforcing the old concrete further comprises the following steps: and before the second step, cleaning the carbon fiber plate (2) to remove all dust, oil stains or mud.
7. The construction method for repairing and reinforcing old concrete according to claim 1, wherein: and in the second step, the coating thickness of the epoxy resin adhesive (3) is 1mm to 2 mm.
8. The construction method for repairing and reinforcing old concrete according to claim 1, wherein: the construction method for repairing and reinforcing the old concrete further comprises the following steps: and after finishing the second step and waiting for 30min, repeatedly rolling the carbon fiber plate (2) along the fiber direction for multiple times by using a drum brush.
9. The construction method for repairing and reinforcing old concrete according to claim 1, wherein: the construction method for repairing and reinforcing the old concrete further comprises the following steps: and in the third step, covering the carbon fiber plate (2) by using a plastic film.
10. The construction method for repairing and reinforcing old concrete according to claim 1, wherein: the construction method for repairing and reinforcing the old concrete further comprises the following steps: and after the third step is finished, coating a mortar protective layer (5) on the outer surface of the carbon fiber plate (2) by using a spatula.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110291002.0A CN113090058A (en) | 2021-03-18 | 2021-03-18 | Construction method for repairing and reinforcing old concrete |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110291002.0A CN113090058A (en) | 2021-03-18 | 2021-03-18 | Construction method for repairing and reinforcing old concrete |
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| CN113090058A true CN113090058A (en) | 2021-07-09 |
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| CN202110291002.0A Pending CN113090058A (en) | 2021-03-18 | 2021-03-18 | Construction method for repairing and reinforcing old concrete |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2391138A1 (en) * | 2002-07-09 | 2004-01-09 | Ben Louis Devino | Patching and strengthening system for cracks in foundation walls and slabs |
| CN101122177A (en) * | 2007-09-04 | 2008-02-13 | 华南理工大学 | Usage method of prestressed thin fiber board in concrete architecture |
| KR20090097984A (en) * | 2008-03-13 | 2009-09-17 | (주)엘씨구조시스템 | Construction method for repairing and reinforcing structures |
| CN201778500U (en) * | 2010-08-16 | 2011-03-30 | 合肥工业大学 | Device for pretensioning carbon fiber board to reinforce concrete beam board |
| CN102677911A (en) * | 2012-05-23 | 2012-09-19 | 山东科技大学 | Maintaining and reinforcing method and structure directed towards aged concrete constructions |
| CN210127673U (en) * | 2019-05-20 | 2020-03-06 | 卡本科技集团股份有限公司 | Large-width carbon fiber plate for building structure reinforcement |
-
2021
- 2021-03-18 CN CN202110291002.0A patent/CN113090058A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2391138A1 (en) * | 2002-07-09 | 2004-01-09 | Ben Louis Devino | Patching and strengthening system for cracks in foundation walls and slabs |
| CN101122177A (en) * | 2007-09-04 | 2008-02-13 | 华南理工大学 | Usage method of prestressed thin fiber board in concrete architecture |
| KR20090097984A (en) * | 2008-03-13 | 2009-09-17 | (주)엘씨구조시스템 | Construction method for repairing and reinforcing structures |
| CN201778500U (en) * | 2010-08-16 | 2011-03-30 | 合肥工业大学 | Device for pretensioning carbon fiber board to reinforce concrete beam board |
| CN102677911A (en) * | 2012-05-23 | 2012-09-19 | 山东科技大学 | Maintaining and reinforcing method and structure directed towards aged concrete constructions |
| CN210127673U (en) * | 2019-05-20 | 2020-03-06 | 卡本科技集团股份有限公司 | Large-width carbon fiber plate for building structure reinforcement |
Non-Patent Citations (1)
| Title |
|---|
| 侯圆等: "浅谈碳纤维材料在箱梁裂缝修复中的应用", 《四川水力发电》 * |
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Application publication date: 20210709 |