CN113047651A - Steel pipe concrete column reinforcing method based on fiber woven mesh - Google Patents
Steel pipe concrete column reinforcing method based on fiber woven mesh Download PDFInfo
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- CN113047651A CN113047651A CN202110239282.0A CN202110239282A CN113047651A CN 113047651 A CN113047651 A CN 113047651A CN 202110239282 A CN202110239282 A CN 202110239282A CN 113047651 A CN113047651 A CN 113047651A
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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
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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
- E04G23/0225—Increasing or restoring the load-bearing capacity of building construction elements of circular building elements, e.g. by circular bracing
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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
- E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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- Structural Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention discloses a steel pipe concrete column reinforcing method based on a fiber woven mesh. The concrete reinforcing steps are as follows: and (3) respectively winding and pasting two ends of the fiber woven mesh on two metal rods of the tensioning anchor by using epoxy resin adhesive, then winding and mounting the fiber woven mesh along the surface of the concrete-filled steel tubular column, and applying prestress in a nut screwing mode. And after the prestress application is finished, spraying the early-strength ECC to cover the woven mesh to finish reinforcement. In the reinforcing method, the annular prestress fiber woven mesh can play a larger role in restraint, so that the restraint effect on core concrete in the concrete-filled steel tube column is further increased, and the bearing capacity of the concrete-filled steel tube column is obviously improved; the ECC covered on the surface of the steel pipe has the advantages of crack resistance, good water seepage resistance and good chlorine ion permeability resistance, and can inhibit the corrosion of the steel pipe; the strengthening layer has good high temperature resistance, and can improve the fire-resistant and high temperature-resistant performance of the concrete-filled steel tubular column.
Description
Technical Field
The invention relates to the technical field of building structure protection, in particular to a method for reinforcing a concrete filled steel tubular column based on a fiber woven mesh.
Background
With the rapid economic development of China, the number of domestic super high-rise buildings and bridge constructions in recent years is increased, and the steel tube concrete in the buildings is widely applied due to the excellent mechanical property. The steel pipe concrete utilizes the interaction of two materials of the steel pipe and the concrete in the stress process, namely the constraint action of the steel pipe on the core concrete, under the action of axial compression load, the concrete is in a three-dimensional compression stress state, and the longitudinal cracking of the concrete under compression can be delayed, so that the strength of the concrete is improved, and the plasticity and the toughness are improved. Meanwhile, due to the existence of the concrete, the local buckling of the steel pipe can be delayed or avoided too early, so that the performance of the material can be fully exerted. The two materials mutually make up the weakness of each other and give full play to the respective advantages, so that the concrete-filled steel tube has higher bearing capacity.
However, the bearing capacity of the steel tube concrete in a large number of service periods is degraded due to external factors, including: the steel pipe is easily rusted and corroded under the influence of natural environment, so that the mechanical property of the steel pipe is deteriorated, and the bearing capacity of the concrete-filled steel pipe column is influenced; when a fire disaster occurs, the steel materials are softened, the steel pipes lose the hoop restraining effect on the core concrete, and the core concrete is stressed independently, so that the bearing capacity of the core concrete is greatly reduced; in addition, some steel pipe concrete columns suffer from the earthquake action or external impact and other loads to generate defects. The above problems all seriously affect the safety and workability of the structure, and for this reason, the damaged concrete filled steel tubular column needs to be reinforced.
Based on the data, the invention provides a brand-new steel pipe concrete column reinforcing method, which is characterized in that a fiber woven mesh is wound on the surface of a steel pipe concrete column, prestress is applied to the steel pipe concrete column, and then early strength ECC is sprayed. The fiber woven mesh has the advantages of corrosion resistance, good chemical stability, high tensile strength and elastic modulus and the like, can be wound on the surface of the concrete filled steel tubular column to further restrict the concrete in the tube, obviously improves the strength of the concrete, and can delay the local bulging of the steel tube. After the prestress is applied, the phenomenon of stress lag of the woven mesh can be solved, and the reinforcing effect is improved. ECC is a cement-based composite material with ultrahigh toughness, which is reinforced by short fibers with volume ratio not more than 2%, and can be processed and molded by conventional stirring process, the hardened composite material has remarkable strain hardening characteristic, and the ultimate tensile strain capacity can reach more than 2%. The ECC is combined with the steel pipe concrete, and cannot be peeled off from the surface of the steel pipe in the stress process due to the ultrahigh toughness of the ECC. In addition, the ECC can effectively limit the width of a limit crack within 100 mu m when cracking, has excellent anti-permeability performance, blocks the invasion of chloride ions and water, and can improve the anti-corrosion performance of the concrete-filled steel tube; on the other hand, ECC has higher fire resistance and can be used as a fireproof protective layer of steel pipe concrete. The early strength ECC is an improved ECC material, so that the ECC material obtains an early strength effect, can be hardened within 12 hours and reaches the strength, and the quick repair of the structure is realized while the effect reinforcement effect is achieved. In conclusion, the method for reinforcing the steel pipe concrete provided by the invention is an efficient and beneficial method, not only can obviously improve the mechanical property of the steel pipe concrete, but also can provide effective protection for the steel pipe concrete, prevent the steel pipe from being damaged due to corrosion, fire or other environmental factors of the steel pipe, and simultaneously achieve the effect in a short time and achieve the purpose of rush repair.
Disclosure of Invention
The invention provides a method for reinforcing a concrete filled steel tubular column based on a fiber woven mesh, which aims to solve the problem of bearing capacity degradation of concrete filled steel tubular columns caused by external factors, realize quick repair of the concrete filled steel tubular columns and improve the corrosion resistance and high temperature resistance of the concrete filled steel tubular columns.
In order to achieve the purpose, the invention provides a steel pipe concrete column reinforcing method based on a fiber woven mesh, which is characterized by comprising the following steps: the steel pipe concrete column tensioning device comprises a steel pipe concrete column to be reinforced, a fiber woven mesh, a tensioning anchor and an early strength ECC, wherein the tensioning anchor comprises two metal rods, a plurality of screw caps and a plurality of screw rods, the two metal rods are arranged in parallel, a plurality of screw holes are distributed in the length direction of the two metal rods at equal intervals, and the screw rods and the screw caps penetrate through the screw holes to connect the two metal rods; the reinforcing steps of the concrete filled steel tubular column to be reinforced are as follows:
winding and pasting two ends of the fiber woven mesh on two metal rods of the tensioning anchor device respectively by using epoxy resin glue, and then winding and mounting the fiber woven mesh along the surface of the concrete-filled steel tubular column, wherein the distance between the two metal rods is reserved between 50mm and 200 mm; a plurality of screw holes are distributed on the two metal rods at equal intervals, a screw rod and a nut are arranged in the screw holes in a penetrating mode, and prestress is applied in a nut screwing mode; and after the prestress is applied, spraying the early-strength ECC to cover the fiber woven mesh to finish reinforcement.
Preferably, the fiber material of the fiber woven mesh is any one of carbon fiber, glass fiber or basalt fiber woven mesh; the fiber woven mesh is a unidirectional stress type woven mesh or a bidirectional stress type woven mesh; the stress direction of the unidirectional stress type woven net is the horizontal direction; the mesh size of the fiber woven mesh is any one of 5mm multiplied by 5mm, 10mm multiplied by 10mm, 20mm multiplied by 20mm or 50mm multiplied by 50 mm; the thickness of the single-bundle fiber of the fiber woven mesh is 0.2 mm-3 mm, and the width of the single-bundle fiber is 0.5 mm-5 mm.
Furthermore, the cross sections of the two metal rods are in a cutting circle shape, the radius of the cutting circle is 12 mm-30 mm, and the arc angle on the cutting circle is 180-270 degrees.
Furthermore, the early strength ECC is an ultrahigh-toughness cement-based material, the compressive strength can reach more than 30MPa within 12 hours, and the ultimate tensile strain can reach more than 2%; the early strength ECC comprises the following components and cement in percentage by weight:
fly ash: 0.1 to 0.5;
water: 0.3 to 0.8;
fine sand: 0.5 to 1;
water reducing agent: 0.001 to 0.01;
early strength agent: 0.0001 to 0.005;
PVA fiber: 0.01 to 0.025;
the cement is sulphoaluminate cement;
the early strength agent is any one of lithium carbonate, triethanolamine, calcium nitrite or calcium formate;
the thickness of the early strength ECC is 20-50 mm.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the fiber woven mesh has the advantages of corrosion resistance, good chemical stability, high tensile strength and elastic modulus and the like, can be wound on the surface of the concrete filled steel tubular column to further restrict the concrete in the tube, obviously improves the strength of the concrete, and can delay the local bulging of the steel tube. After the prestress is applied, the phenomenon of stress lag of the woven mesh can be solved, and the reinforcing effect is improved.
2. The early strength ECC is combined with the steel pipe concrete, and cannot be peeled off from the surface of the steel pipe in the stress process due to the ultrahigh toughness of the early strength ECC. In addition, the limit crack width can be effectively limited within 100 μm when the early-strength ECC cracks, as shown in FIG. 5, the anti-corrosion performance of the concrete filled steel tube is improved due to the excellent anti-permeability performance, the invasion of chloride ions and water is blocked; on the other hand, the early strength ECC has higher fire resistance and can be used as a fireproof protective layer of steel pipe concrete.
3. The improved early-strength ECC material can be hardened within 12 hours and reach the strength, and the structure can be quickly repaired while the reinforcement effect is achieved.
Drawings
FIG. 1 is a schematic view of a reinforced concrete filled steel tubular column according to the present invention;
FIG. 2 is a schematic view of the present invention showing a woven fiber mesh with two ends wrapped around and adhered to a tension anchor;
FIG. 3 is a schematic view of a tension anchor of the present invention;
FIG. 4 is a cross-sectional view of a metal rod according to the present invention;
FIG. 5 is a graph of the early strength ECC multi-crack of the present invention.
Wherein: 1. the concrete column of steel pipe, 2. the woven fiber net, 3. the tension anchor, 31. the metal pole, 32. the nut, 33. the screw rod, 4. the ECC of early strengthening.
Detailed Description
The concrete filled steel tubular column reinforcing method based on fiber woven mesh according to the present invention will be further described below by using specific examples and with reference to the accompanying drawings, so as to help those skilled in the art to more completely, accurately and deeply understand the technical solution of the present invention.
The attached drawings only take the circular section steel pipe concrete column as an example, and the method for adding the protective layer to the steel pipe concrete is suitable for the steel pipe concrete columns with various sections.
As shown in figure 1, the method for applying the protective layer to the concrete filled steel tube comprises a reinforced concrete filled steel tube column, a fiber woven mesh, a tension anchor and early strength ECC. The concrete reinforcing steps are as follows:
winding and pasting two ends of the fiber woven mesh on two metal rods of the tension anchor respectively by using epoxy resin glue, wherein the two ends are shown in figure 2, and the schematic diagram of the tension anchor is shown in figure 3;
winding and installing a fiber woven mesh along the surface of the concrete filled steel tubular column, wherein two metal rods of the tension anchor after winding are spaced at a certain distance according to the length of the woven mesh designed in advance;
screw holes are distributed at equal intervals in the length direction of the metal rod, a screw rod and a nut are arranged in the screw holes in a penetrating mode, the nut is in contact with the cutting plane of the metal rod, and the section of the metal rod is shown in figure 4. The prestress is applied by screwing the screw cap, and the prestress level applied to the fiber woven mesh can be calculated by the tensile force of each screw according to the stress balance principle. When prestress is applied, strain gauges are adhered to the screw rods, and the tensile force of the screw rods is calculated by monitoring the deformation of the rods.
And after the prestress application is finished, spraying the early-strength ECC to cover the woven mesh to finish reinforcement.
Example 1
The type of the woven mesh is a bidirectional carbon fiber woven mesh, the prestress level is 30%, the mesh size is 20mm multiplied by 20mm, the thickness of a single-bundle fiber is 0.5mm, the width is 1mm, the tensile strength of the carbon fiber is 3400MPa, and the ultimate elongation is 1.5%; the radius of a cutting circle of a metal rod in the tension anchor is 12mm, the arc angle is 270 degrees, and the diameter of a screw rod is 12 mm; the thickness of the early strength ECC layer is 30mm, the early strength ECC layer comprises sulphoaluminate cement, first-level fly ash, water, fine sand, a water reducing agent, an early strength agent and PVA fibers, and the corresponding specific gravity is sulphoaluminate cement: first-grade fly ash: water: fine sand: water reducing agent: early strength agent: PVA fiber 1: 0.2: 0.4: 1: 0.005:0.0005: 0.015, the early strength agent is lithium carbonate, the compressive strength of the early strength ECC in 6 hours reaches more than 30MPa, and the ultimate tensile strain is more than 2%.
Example 2
The type of the woven mesh is a unidirectional carbon fiber woven mesh, the prestress level is 30%, the mesh size is 10mm multiplied by 10mm, the thickness of a single-bundle fiber is 0.5mm, the width is 0.5mm, the tensile strength of the carbon fiber is 3400MPa, and the ultimate elongation is 1.5%; the radius of a circle cut by a metal rod in the tension anchor is 10mm, the arc angle is 240 degrees, and the diameter of a screw rod is 10 mm; the thickness of the early strength ECC layer is 35mm, the early strength ECC layer comprises sulphoaluminate cement, first-level fly ash, water, fine sand, a water reducing agent, an early strength agent and PVA fibers, and the corresponding specific gravity is sulphoaluminate cement: first-grade fly ash: water: fine sand: water reducing agent: early strength agent: PVA fiber 1: 0.25: 0.5: 0.8: 0.003:0.0002: 0.02, the early strength agent is lithium carbonate, the compressive strength of the early strength ECC in 12 hours reaches more than 30MPa, and the ultimate tensile strain is more than 2%.
Example 3
The type of the woven mesh is a bidirectional basalt fiber woven mesh, the prestress level is 30%, the mesh size is 10mm multiplied by 10mm, the thickness of a single-strand fiber is 1mm, the width is 2mm, the tensile strength of the basalt fiber is 600MPa, and the ultimate elongation is 2.2%; the radius of a cutting circle of a metal rod in the tension anchor is 12mm, the arc angle is 270 degrees, and the diameter of a screw rod is 14 mm; the thickness of the early strength ECC layer is 40mm, the early strength ECC layer comprises sulphoaluminate cement, first-level fly ash, water, fine sand, a water reducing agent, an early strength agent and PVA fibers, and the corresponding specific gravity is sulphoaluminate cement: first-grade fly ash: water: fine sand: water reducing agent: early strength agent: PVA fiber 1: 0.1: 0.45: 0.8: 0.006:0.001: 0.02, the early strength agent is lithium carbonate, the compressive strength of the early strength ECC in 4 hours reaches more than 30MPa, and the ultimate tensile strain is more than 2%.
The protective scope of the present invention is not limited to the above-described embodiments, and those skilled in the art can make various modifications and variations of the present invention without departing from the scope and spirit of the invention. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (5)
1. A steel pipe concrete column reinforcing method based on fiber woven mesh is characterized in that: the steel pipe concrete column tensioning device comprises a steel pipe concrete column (1) to be reinforced, a fiber woven mesh (2), a tensioning anchor (3) and an early strength ECC (4), wherein the tensioning anchor (3) comprises two metal rods (31), a plurality of screw caps (32) and a plurality of screw rods (33), the two metal rods (31) are arranged in parallel, a plurality of screw holes are formed in the length direction of the two metal rods (31) at equal intervals, and the screw rods (33) and the screw caps (32) penetrate through the screw holes to connect the two metal rods (31); the reinforcing steps of the concrete-filled steel tubular column (1) to be reinforced are as follows:
winding and pasting two ends of the fiber woven mesh (2) on two metal rods (31) of the tensioning anchor device (3) by using epoxy resin glue, and then winding and installing the fiber woven mesh (2) along the surface of the steel pipe concrete column (1), wherein the distance between the two metal rods (31) is reserved between 50mm and 200 mm; a plurality of screw holes are distributed on the two metal rods (31) at equal intervals, a screw rod (33) and a screw cap (32) are arranged in the screw holes in a penetrating mode, and prestress is applied in a screw cap (32) screwing mode; and after the prestress is applied, spraying early strength ECC (4) to cover the fiber woven mesh (2) to finish reinforcement.
2. The method for reinforcing a concrete filled steel tubular column based on a fiber woven mesh according to claim 1, which is characterized in that: the fiber material of the fiber woven mesh (2) is any one of carbon fiber, glass fiber or basalt fiber woven mesh; the fiber woven net (2) is a unidirectional stress type woven net or a bidirectional stress type woven net; the stress direction of the unidirectional stress type woven net is the horizontal direction; the mesh size of the fiber woven mesh (2) is any one of 5mm multiplied by 5mm, 10mm multiplied by 10mm, 20mm multiplied by 20mm or 50mm multiplied by 50 mm; the thickness of the single-bundle fiber of the fiber woven net (2) is 0.2 mm-3 mm, and the width is 0.5 mm-5 mm.
3. A steel core concrete column reinforcement method based on fiber mesh grid according to claim 1 or 2, characterized in that: the cross sections of the two metal rods (31) are all in a cutting circle shape, the radius of the cutting circle is 12 mm-30 mm, and the arc angle on the cutting circle is 180-270 degrees.
4. A steel core concrete column reinforcement method based on fiber mesh grid according to claim 1 or 2, characterized in that: the early strength ECC (4) is an ultrahigh toughness cement-based material, the compressive strength can reach more than 30MPa within 12 hours, and the ultimate tensile strain can reach more than 2%; the early strength ECC (4) comprises the following components and cement in percentage by weight:
fly ash: 0.1 to 0.5;
water: 0.3 to 0.8;
fine sand: 0.5 to 1;
water reducing agent: 0.001 to 0.01;
early strength agent: 0.0001 to 0.005;
PVA fiber: 0.01 to 0.025;
the cement is sulphoaluminate cement;
the early strength agent is any one of lithium carbonate, triethanolamine, calcium nitrite or calcium formate;
the thickness of the early strength ECC (4) is 20-50 mm.
5. The method for reinforcing a concrete filled steel tubular column based on a fiber woven mesh according to claim 3, which is characterized in that:
the early strength ECC (4) is an ultrahigh toughness cement-based material, the compressive strength can reach more than 30MPa within 12 hours, and the ultimate tensile strain can reach more than 2%; the early strength ECC (4) comprises the following components and cement in percentage by weight:
fly ash: 0.1 to 0.5;
water: 0.3 to 0.8;
fine sand: 0.5 to 1;
water reducing agent: 0.001 to 0.01;
early strength agent: 0.0001 to 0.005;
PVA fiber: 0.01 to 0.025;
the cement is sulphoaluminate cement;
the early strength agent is any one of lithium carbonate, triethanolamine, calcium nitrite or calcium formate;
the thickness of the early strength ECC (4) is 20-50 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110239282.0A CN113047651A (en) | 2021-03-04 | 2021-03-04 | Steel pipe concrete column reinforcing method based on fiber woven mesh |
| PCT/CN2022/078608 WO2022184053A1 (en) | 2021-03-04 | 2022-03-01 | Concrete-filled steel tubular column reinforcement method based on fiber woven mesh |
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| CN202110239282.0A CN113047651A (en) | 2021-03-04 | 2021-03-04 | Steel pipe concrete column reinforcing method based on fiber woven mesh |
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| WO2022184053A1 (en) * | 2021-03-04 | 2022-09-09 | 武汉大学 | Concrete-filled steel tubular column reinforcement method based on fiber woven mesh |
| BE1028946B1 (en) * | 2022-05-06 | 2023-06-02 | Univ Wuhan | METHOD OF REINFORCEMENT FOR STEEL PIPE COLUMN WITH CONCRETE FILLING ON THE BASE OF TEXTILE |
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| WO2022184053A1 (en) | 2022-09-09 |
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