CN111502326A - Rapid prestress FRP grid reinforcing method - Google Patents
Rapid prestress FRP grid reinforcing method Download PDFInfo
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- CN111502326A CN111502326A CN202010360733.1A CN202010360733A CN111502326A CN 111502326 A CN111502326 A CN 111502326A CN 202010360733 A CN202010360733 A CN 202010360733A CN 111502326 A CN111502326 A CN 111502326A
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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
- E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
- E04G2023/0255—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements whereby the fiber reinforced plastic elements are stressed
- E04G2023/0259—Devices specifically adapted to stress the fiber reinforced plastic 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
- E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
- E04G2023/0262—Devices specifically adapted for anchoring the fiber reinforced plastic elements, e.g. to avoid peeling off
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention discloses a rapid prestress FRP grid reinforcing method, which comprises the following steps: (1) cleaning the surface of a concrete structure to be reinforced; (2) mounting a prestressed anchorage device on the surface of the structure; (3) coating a layer of interfacial agent on the surface of the structure; (4) respectively fastening two ends of the FRP grid in a prestressed anchorage device, and then tensioning the prestressed anchorage device; (5) sealing and coating the middle part of the FRP grid by adopting polymer mortar, and sealing and coating the two ends of the FRP grid by adopting geopolymer mortar; (6) and after the geopolymer mortar at the two ends reaches the designed strength, the prestressed anchorage device is dismantled, and the middle polymer mortar is continuously maintained until the middle polymer mortar reaches the designed strength. The reinforcing method has the advantages of simple process and lower cost, can finish reinforcement in a shorter time, effectively improves the stress performance of the damaged part of the concrete structure, and improves the bearing capacity and durability of the structure.
Description
Technical Field
The invention relates to the technical field of civil engineering and traffic structure reinforcement, in particular to a rapid prestress FRP grid reinforcing method, which is used for improving the stress performance of an old building structure by using FRP grids.
Background
With the increase of the service time of the building structure, the structure is gradually aged, and particularly under severe environment, the structure is aged more seriously. The aging of reinforced concrete structures is the result of combined actions of corrosion of reinforcing steel bars, concrete deterioration and use load change, and the durability and the usability of the structures are reduced, which is an irreversible process. At present, a large amount of reinforced concrete structures in China are aged, so that the concrete structures are gradually damaged, the performance is continuously deteriorated, the bearing capacity is reduced, and the public property safety of the society is harmed. Therefore, the reasonable and effective reinforced concrete structure reinforcement and reconstruction has important social significance and is beneficial to national sustainable development.
At present, the reinforcing methods widely applied to engineering all have some defects which are difficult to overcome, such as long wet operation time of field construction in the method for reinforcing the section by increasing, and influence on the structure clearance after reinforcing. In the reinforcing method of the bonded steel plate, the bonded steel is easy to hollowly bulge, the steel plate is easy to rust, and the later maintenance cost is high. In contrast, the externally-adhered Fiber Reinforced Plastic (FRP) cloth has obvious reinforcing advantages, high construction speed, no influence on structure clearance and good durability. However, in some fields, some limitations are still faced, for example, the external FRP cloth has high sensitivity to temperature, and the shear transmission between fibers is lost due to the softening and decomposition of the fiber matrix material in the temperature raising process, which causes the significant reduction of the strength and rigidity of the FRP material, and special measures are needed in the indoor environment with high fire-proof requirement. Compared with the traditional cement-based repair material, the adhesive for bonding the FRP cloth and the concrete has weaker air permeability, and after the FRP is externally attached to a concrete structure, moisture or humidity is easy to be retained at an FRP-concrete bonding interface, so that the mechanical properties of the bonding material and the bonding interface are degraded, and finally the interface of the FRP and the concrete is peeled.
The FRP grid is a grid-shaped composite material product produced by continuous fibers according to a certain process, and is generally in an orthogonal bidirectional form. The structure adopts FRP grid-polymer mortar thin surface pasting reinforcement to overcome the defect of external pasting FRP sheet reinforcement. The method adopts the polymer mortar as the bonding material, has good aging resistance, air permeability, impact resistance and fire resistance, and is particularly suitable for severe environments. But the strength utilization rate of the ordinary externally-attached reinforced FRP grid is low, and the reinforcing effect is lagged, so that the further popularization and application of the FRP grid are limited. In the partial reinforcing method, prestress is applied to FRP to improve the reinforcing effect, but the tensioning anchor device is generally not detached as a permanent mechanical anchor after tensioning is finished, and the other parts of the structure are reinforced by a new tensioning anchor device, so that multiple sets of tensioning anchor devices are required for engineering reinforcement, and the material cost is high.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a quick prestressed FRP grid reinforcing method which is simple in process, quick and efficient, can realize the effects of structural reinforcement and fire resistance and corrosion resistance, and weakens the adverse effect on production and life caused by structural reinforcement construction.
The technical scheme is as follows: the invention relates to a rapid prestressed FRP grid reinforcing method, which comprises the following steps:
(1) cleaning the surface of a concrete structure to be reinforced, wherein the concrete structure to be reinforced is a reinforced concrete stressed structure in a building, and the reinforcing surface is a plane;
(2) mounting a prestressed anchorage device for tensioning FRP grid on the surface of the concrete structure to be reinforced;
(3) smearing a layer of interfacial agent on the surface of a concrete structure to be reinforced;
(4) respectively fastening two ends of the FRP grids in the pre-stressed anchorage device installed in the step (2), tensioning the pre-stressed anchorage device, and applying pre-stress to the FRP grids;
(5) sealing the middle part of the FRP grid applied with prestress by adopting polymer mortar, and sealing the two ends of the FRP grid by adopting geopolymer mortar;
(6) and after the geopolymer mortar at the two ends reaches the designed strength, the prestressed anchorage device is dismantled, and the middle polymer mortar is continuously maintained until the middle polymer mortar reaches the designed strength.
According to a further preferable technical scheme, the prestressed anchorage device used for tensioning the FRP grid in the step (2) is a flat plate type, and the FRP grid is anchored by friction force generated by pre-tightening bolts.
Preferably, the interfacial agent in the step (3) is an epoxy-based interfacial agent with high permeability, and the coating thickness is 0.1-0.5 mm.
Preferably, the FRP mesh in the step (4) is a mesh-like material made of fibers and resin by a molding process.
Preferably, the FRP mesh may be one of a carbon fiber mesh, a basalt fiber mesh, or an aramid fiber mesh.
Preferably, the width of the FRP grid is consistent with the width of the anchorage device, the thickness of the FRP grid is 3-5mm, and the distance between longitudinal and transverse grid ribs of the FRP grid is greater than 20 mm.
Preferably, in the step (4), a jack is adopted to stretch the prestressed anchorage device, the jack is a through hydraulic jack, the stretching force is loaded at a constant speed in the stretching process, and the stress state of the FRP grid is monitored constantly.
Preferably, PVA anti-crack fibers are added into the polymer mortar in the step (5).
Preferably, the geopolymer mortar in the step (5) is an inorganic cementing material obtained by alkali excitation of blast furnace slag powder through water glass, the curing strength of the geopolymer mortar is higher than 50MPa, and the geopolymer mortar reaches more than 70% of the strength within 2 hours.
Preferably, when the geopolymer mortar is used for sealing two ends of the FRP grid in the step (5), the sealing length L of each end is calculated according to the following formula and is not less than 400 mm;
in the formula, EpAnd tpThe thickness and the elastic modulus of the FRP grid are respectively; f. ofcThe compressive strength of the concrete is shown.
Has the advantages that: the reinforcing method has the advantages of simple process and lower cost, can finish reinforcement in a shorter time, effectively improves the stress performance of the damaged part of the concrete structure, and improves the bearing capacity and durability of the structure.
Compared with the common external FRP grid reinforcing method, the reinforcing method provided by the invention has the advantages that the prestress is applied to the FRP grid, the prestress FRP grid can further exert the material strength, the structural crack development is more effectively inhibited, and the structural performance is improved. Through reasonable design, geopolymer mortar with high hardening speed and small shrinkage rate is adopted to seal and coat two ends of the FRP grid, and the prestress tensioning device can be disassembled in a short time and put into reuse, so that the structure can be quickly repaired, and the influence on life is reduced.
Drawings
FIG. 1 is a schematic view of surface treatment and FRP grid installation of a structure to be reinforced.
FIG. 2 is a schematic diagram of FRP grid tensioning and surface sealing.
Fig. 3 is a schematic structural view of the grid jig.
FIG. 4 is a schematic structural diagram of a prestressed anchorage device.
In the figure, 1-concrete structure to be reinforced, 2-FRP grid, 3-prestressed anchorage device, 3 a-upper cover plate, 3 b-grid clamp, 4-jack, 5-interface agent, 6-polymer mortar and 7-geopolymer mortar.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the embodiments.
Example (b): a quick prestress FRP grid reinforcing method comprises the following steps:
(1) the concrete structure 1 to be reinforced is a reinforced concrete stressed structure in a building, and the reinforcing surface is a plane; the surface of the concrete structure 1 to be reinforced is cleaned, deteriorated layers (such as laitance, weathered layers and the like) on the inner surface of a reinforced area of the concrete structure 1 to be reinforced are cleaned and polished by a grinding machine, dislocation and a protruding part are ground flat, then dust is removed by compressed air, and the reinforced surface is washed by a high-pressure water gun.
(2) Mounting a prestressed anchorage device 3 for tensioning the FRP grid 2 on the surface of the concrete structure 1 to be reinforced; the prestressed anchorage device 3 for tensioning the FRP grid 2 is a flat plate, and an upper cover plate 3a of the prestressed anchorage device 3 is anchored on the concrete structure 1 to be reinforced by using a fixing bolt.
(3) And (3) coating a layer of interfacial agent 5 on the surface of the concrete structure 1 to be reinforced, wherein the interfacial agent 5 is an epoxy-based interfacial agent 5 with high permeability, and the coating thickness is 0.1-0.5 mm.
(4) Two ends of the FRP grid 2 are fastened with grid clamps 3b through pre-tightening bolts, the grid clamps 3b at the two ends are respectively clamped into an upper cover plate 3a of the prestressed anchorage device 3, and a tensioning screw penetrates through a tensioning screw hole of the upper cover plate 3a of the prestressed anchorage device 3 and is fixed in a tensioning screw hole of the grid clamps 3 b. And screwing a nut on the tensioning screw, installing the reaction frame and the hydraulic jack 4, and pressurizing the jacks 4 at two ends after screwing the nut to drive the tensioning screw to tension the FRP grid 2. And tensioning the FRP grid 2 to the designed load, screwing the nut, and if large prestress loss occurs, immediately supplementing tensioning.
The FRP grid 2 can be one of a carbon fiber grid, a basalt fiber grid or an aramid fiber grid. The width of the FRP grid 2 is consistent with the width of the anchorage device, the thickness of the FRP grid 2 is 3-5mm, and the interval between the longitudinal grid ribs and the transverse grid ribs of the FRP grid 2 is larger than 20 mm.
(5) The middle part of the FRP grid 2 applied with prestress is sealed by polymer mortar 6, the spraying process is used, the thickness of the polymer mortar 6 sprayed is preferably 10mm more than the surface of the FRP grid 2, and a trowel is used for filling, leveling and compacting.
(6) Sealing two ends of the FRP grid 2 by geopolymer mortar 7, wherein when the two ends of the FRP grid 2 are sealed by geopolymer mortar 7, the sealing length L of each end is calculated according to the following formula and is not less than 400 mm;
in the formula, EpAnd tpThe thickness and the elastic modulus of the FRP grid are respectively; f. ofcThe compressive strength of the concrete is shown.
PVA anti-crack fibers are added into the polymer mortar 6. The geopolymer mortar 7 is an inorganic cementing material obtained by alkali excitation of blast furnace slag powder through water glass, and the curing strength of the geopolymer mortar 7 is higher than 50MPa and reaches more than 70% of the strength within 2 hours.
(7) And (3) removing the prestressed anchorage device 3 after the geopolymer mortar 7 reaches the required strength after 2 hours. The concrete structure 1 to be reinforced can be put into use after the middle polymer mortar 6 reaches the design strength.
As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited thereto. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A rapid prestress FRP grid reinforcing method is characterized by comprising the following steps:
(1) cleaning the surface of a concrete structure to be reinforced, wherein the concrete structure to be reinforced is a reinforced concrete stressed structure in a building, and the reinforcing surface is a plane;
(2) mounting a prestressed anchorage device for tensioning FRP grid on the surface of the concrete structure to be reinforced;
(3) smearing a layer of interfacial agent on the surface of a concrete structure to be reinforced;
(4) respectively fastening two ends of the FRP grids in the pre-stressed anchorage device installed in the step (2), tensioning the pre-stressed anchorage device, and applying pre-stress to the FRP grids;
(5) sealing the middle part of the FRP grid applied with prestress by adopting polymer mortar, and sealing the two ends of the FRP grid by adopting geopolymer mortar;
(6) and after the geopolymer mortar at the two ends reaches the designed strength, the prestressed anchorage device is dismantled, and the middle polymer mortar is continuously maintained until the middle polymer mortar reaches the designed strength.
2. The method for reinforcing the FRP grid under the rapid prestress according to claim 1, wherein the prestressed anchorage device for tensioning the FRP grid in the step (2) is a flat plate type, and the FRP grid is anchored by the friction force generated by the pretensioning of the bolts.
3. The method for reinforcing the rapidly prestressed FRP grid as claimed in claim 1, wherein the interfacial agent in the step (3) is an epoxy-based interfacial agent with high permeability, and the coating thickness is 0.1-0.5 mm.
4. The method for reinforcing FRP grid with rapid prestressing as set forth in claim 1, wherein in the step (4), the FRP grid is a grid-like material made of fiber and resin by a molding process.
5. The method for reinforcing the rapid prestressed FRP grid according to claim 4, wherein the FRP grid can be one of a carbon fiber grid, a basalt fiber grid or an aramid fiber grid.
6. The rapid prestressed FRP grid reinforcement method of claim 4, wherein the width of the FRP grid is consistent with the width of the anchorage device, the thickness of the FRP grid is 3-5mm, and the distance between the longitudinal and transverse grid ribs of the FRP grid is greater than 20 mm.
7. The method for reinforcing the rapid prestressed FRP grid according to claim 1, wherein in the step (4), a jack is used for tensioning the prestressed anchorage device, the jack is a through hydraulic jack, the tensioning force is loaded at a constant speed in the tensioning process, and the stress state of the FRP grid is constantly monitored.
8. The method for reinforcing the rapid prestressed FRP grid as claimed in claim 1, wherein PVA anti-crack fiber is added to the polymer mortar in the step (5).
9. The method for reinforcing the rapid prestressed FRP grid according to claim 1, wherein the geopolymer mortar in the step (5) is an inorganic gelled material obtained by alkali excitation of blast furnace slag powder through water glass, the curing strength of the geopolymer mortar is higher than 50MPa and reaches more than 70% of the strength within 2 hours.
10. The method for reinforcing FRP grid with rapid prestressing as set forth in claim 9, wherein in the step (5), when sealing both ends of FRP grid with geopolymer mortar, the sealing length L of each end is calculated according to the following formula and should not be less than 400 mm;
in the formula, EpAnd tpThe thickness and the elastic modulus of the FRP grid are respectively; f. ofcThe compressive strength of the concrete is shown.
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| CN202010360733.1A CN111502326A (en) | 2020-04-30 | 2020-04-30 | Rapid prestress FRP grid reinforcing method |
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| CN202010360733.1A CN111502326A (en) | 2020-04-30 | 2020-04-30 | Rapid prestress FRP grid reinforcing method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112854024A (en) * | 2021-01-10 | 2021-05-28 | 山西省交通新技术发展有限公司 | Construction method of bonded prestressed structure for reinforcing hollow slab bridge |
| CN114592443A (en) * | 2022-03-28 | 2022-06-07 | 东莞理工学院 | Device and method for reinforcing coastal erosion concrete |
| CN114775459A (en) * | 2022-04-02 | 2022-07-22 | 东莞理工学院 | Coastal concrete reinforcement and monitoring integrated device and method |
| CN115450662A (en) * | 2022-09-28 | 2022-12-09 | 河海大学 | Tunnel crack lining reinforcing method based on SMA (shape memory alloy) ribs and FRP (fiber reinforced plastic) grids |
| CN115677275A (en) * | 2022-09-07 | 2023-02-03 | 广州公路工程集团有限公司 | Geopolymer-based bonding material for structural reinforcement and preparation method and application thereof |
| CN116787578A (en) * | 2023-08-22 | 2023-09-22 | 内蒙古工业大学 | Manufacturing device and manufacturing method of high-performance fiber reinforced cement substrate |
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| CN105839936A (en) * | 2016-03-31 | 2016-08-10 | 东南大学 | Pre-stress FRP grid tensioning anchoring device and tensioning anchoring method |
| CN105888283A (en) * | 2016-05-10 | 2016-08-24 | 郑州大学 | Method for reinforcing reinforced concrete shear wall structure by using FRP grid strengthened ECC strips |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112854024A (en) * | 2021-01-10 | 2021-05-28 | 山西省交通新技术发展有限公司 | Construction method of bonded prestressed structure for reinforcing hollow slab bridge |
| CN114592443A (en) * | 2022-03-28 | 2022-06-07 | 东莞理工学院 | Device and method for reinforcing coastal erosion concrete |
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| CN115677275A (en) * | 2022-09-07 | 2023-02-03 | 广州公路工程集团有限公司 | Geopolymer-based bonding material for structural reinforcement and preparation method and application thereof |
| CN115450662A (en) * | 2022-09-28 | 2022-12-09 | 河海大学 | Tunnel crack lining reinforcing method based on SMA (shape memory alloy) ribs and FRP (fiber reinforced plastic) grids |
| CN116787578A (en) * | 2023-08-22 | 2023-09-22 | 内蒙古工业大学 | Manufacturing device and manufacturing method of high-performance fiber reinforced cement substrate |
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Application publication date: 20200807 |