CN104805775A - Construction method for RC (Reinforced Concrete) bridge pier post-earthquake restoration technology - Google Patents
Construction method for RC (Reinforced Concrete) bridge pier post-earthquake restoration technology Download PDFInfo
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Abstract
The invention relates to a construction method for an RC (Reinforced Concrete) bridge pier post-earthquake restoration technology. According to the construction method, damaged longitudinal reinforcements of a bridge pier can be repaired by using variable-cross-section steel reinforcements, and a repair area is wrapped with FRP (Fiber Reinforced Plastics) so as to improve the ductility and shear resistance of the bridge pier; through using the variable-cross-section steel reinforcements, the ductility and energy dissipation performance of the bridge pier are improved, and the ductility and earthquake resistance of the bridge pier are improved; concrete of a plastic hinge region is restricted through wrapping FRP, so that the damage resistance of the concrete of the region during earthquake is improved, and the plastic hinge region is prevented from being subjected to longitudinal reinforcement lapped damage; compared with the method of increasing cross section, the construction method has the advantages that the geometrical dimensions of original pier columns are not changed, the navigable net width of a navigable river reach and the flow area of flood are not changed, the structure weight is not increased, and the imposed load of original bank piers and pile foundations is not increased; compared with the fiber material wrapping restoration method, the construction method has the advantages that the shear strength of the pier columns can be effectively restored and improved, longitudinal reinforcement lapped damage is prevented, the ductility of the bridge pier is improved, and the earthquake resistance and energy dissipation performance of the bridge pier can be effectively improved due to the variable-cross-section steel reinforcements.
Description
Technical field
The present invention relates to the construction method of the rear recovery technique of a kind of RC bridge pier shake.
Background technology
After to bridge shake, destroy condition survey display, there is various deficiency in reinforced concrete bridge pier in antidetonation, as lacked lateral tie constraint, causes bridge pier shear resistance weak; Vertical muscle overlap joint easily destroys, normally the part the most easily destroyed of bridge, the repairing and reinforcement destroyed after its shake, timely and effectively carries out earthquake relief work work and saves reconstruction funds all very important, become research emphasis for resuming traffic, guaranteeing.Conventional bridge pier restoring and fastening method has: increasing section repairing method, outside steel pipe reinforcing method, paste fibrous composite reinforcing method, steel mesh reinforcement high-performance cement composite mortar repairing method, transverse prestress repairing method, cloth and steel composite consolidation repairing method etc., but all there is problem in various degree and defect in these methods, such as: section-increased method construction method is easy, material therefor is simply easy to obtain, and it is reliable to the effect stability of Pier Column Reinforcing, but the method cast in situs is many, curing time is long, larger change is produced to former pier stud, affect original integral bridge aesthetic effect, bridge pier for navigation section reduces the discharge area of navigation clear span and flood, affects flood discharge, increase dead load, the pressure of pile foundation of bearing platform may be increased the weight of, cause the unnecessary burden in basis, the rear destruction in bridge pier repairing research of shake is being found, outer wrapping fiber material is a kind of effective restorative procedure, it effectively can be repaired and improve pier stud shear strength, prevent vertical muscle overlap joint destroy and improve concrete constraint to obtain larger displacement Ductility, but when the situation occurring vertical muscle yield failure, be difficult to only repair concrete, now also need the replacement carrying out surrendering vertical muscle.
The nineties rises, some researchers begin one's study and destroy the method for the new and old reinforcing bar replacement of rear abutment, and the mode of with bolts carries out new and old bar connecting, this mode subject matter needs to arrange especially connector, and costly, need to carry out screw thread process to original reinforcing bar in practical application simultaneously, be difficult to practical application.
Summary of the invention
For above deficiency can be overcome, the present invention proposes a kind of new vertical muscle replacement method and new vertical muscle form: adopt butt joint by variable cross-section reinforcement and former bar connecting, and be placed on outside areas of plasticity hinge by link position.According to ability design principle, areas of plasticity hinge possible in design is deliberately weakened and is repositioned at away from the substructure such as stake and bent cap, this requirement ensure that destruction is fully defined through specially designed areas of plasticity hinge, ensures not ftracture and remain in elastic range in other positions simultaneously.
A construction method for recovery technique after the shake of RC bridge pier, is characterized in that, carry out according to the following steps:
(1) make variable cross-section reinforcement, reinforcing bar is become variable cross-section reinforcement by variable cross-section process;
(2) cut the concrete that territory, Pier is destroyed, until expose bridge pier longitudinal reinforcement, cut concrete scope and determine according to Plastic hinge length, and consider that variable cross-section reinforcement two ends connect the length needed;
(3) destruction of original for areas of plasticity hinge reinforcing bar part is removed;
(4) use the form of jam weld, welded by preprepared variable cross-section reinforcement with original reinforcing bar, formwork erection after welding is good, concreting restores pier shaft, and carries out maintenance, reaches form removal after strength of mould stripping until concrete;
(5) after the reparation of restoring area concreting, outsourcing FRP bar belt construction is carried out to bridge pier, complete reparation.
Further, in step (1), described reinforcing bar is the reinforcing bar identical with raw steel muscle or stainless steel rebar.
Further, in step (1), described variable cross-section reinforcement is the reinforcing bar that sectional dimension is different.
Further, in step (1), the effective length of variable cross-section section and the control of link length to be paid close attention in variable cross-section reinforcement processing, should determine in strict accordance with designing and calculating.
Further, in step (2), cut concrete scope and determine according to Plastic hinge length, and consider that variable cross-section reinforcement two ends connect the length needed.
Further, in step (3), original reinforcing bar removes position and should interlock.
Further, in step (4), the position of adjacent variable cross-section reinforcement variable cross-section needs at sustained height.
Further, in step (5), described FRP band is CFRP band.
Compared with prior art, the invention has the beneficial effects as follows: realize by utilizing variable cross-section reinforcement the reparation that bridge pier destroys vertical muscle, and use FRP outsourcing restoring area to improve ductility and the shear behavior of bridge pier; Improved ductility and the energy-dissipating property of bridge pier by the use of variable cross-section reinforcement, improve bridge pier tensility shock-resistant performance; By outsourcing FRP constraint areas of plasticity hinge concrete, improve the survivability of this region concrete in earthquake, vertical muscle overlap joint destroys to prevent areas of plasticity hinge from occurring.Compared with section-increased method, do not change former pier stud physical dimension, original integral bridge aesthetic effect can not be affected, do not change the discharge area of navigation section navigation clear span and flood, be beneficial to flood discharge, do not increase dead load, do not increase original cushion cap and pile foundation imposed load, alleviate the unnecessary burden that generation should be repaired in basis; Compared with outer wrapping fiber material repair methods, it effectively can not only be repaired and improve pier stud shear strength, prevent vertical muscle overlap joint to destroy, improve bridge pier ductility, the vertical muscle destroyed and concrete are repaired, replace the vertical muscle of surrender, and the use of variable cross-section reinforcement can effectively improve bridge pier energy consumption ability.
Accompanying drawing explanation
Fig. 1 is the structural representation of variable cross-section reinforcement;
The construction schematic diagram of Fig. 2 step (2);
Fig. 3 is the A-A sectional view of Fig. 2;
The construction schematic diagram of Fig. 4 step (3);
Fig. 5 is the B-B sectional view of Fig. 4
The construction schematic diagram of Fig. 6 step (4);
Fig. 7 is the C-C sectional view of Fig. 6
The construction schematic diagram of Fig. 8 step (5);
Fig. 9 is the D-D sectional view of Fig. 8
In figure:
Concrete, 6-FRP band, the new and old steel bar welding contact of 7-, 8-variable cross-section reinforcement effective length, 9-variable cross-section reinforcement overall length, 10-cushion cap, 11-bridge pier pier shaft after the concrete that the original reinforcing bar of 1-bridge pier, 2-variable cross-section reinforcement, 3-cut, 4-former bridge pier concrete, 5-repair.
Detailed description of the invention
The present invention carries out the reparation of shake rear abutment by utilizing variable cross-section reinforcement, and bridge pier concentration of plastic deformation is in variable cross-section reinforcement altitude range, and bridge pier destroys and is limited in areas of plasticity hinge; When variable cross-section reinforcement makes areas of plasticity hinge cross section longitudinal steel ratio reduce, although bridge pier drag reduces than using the bridge pier of uniform section reinforcing bar, but research finds that variable cross-section reinforcement improves more to displacement of bridge pier ductility and energy-dissipating property, when meeting bridge pier drag and being greater than design load, variable cross-section reinforcement is used can effectively to improve bridge pier anti-seismic performance.During reparation, outsourcing carbon cloth avoids bridge pier and first shear failure occurs; Research finds after use variable cross-section reinforcement, needs enough outsourcing carbon cloth constraints, prevents the bridge pier premature failure after reinforcing, and improve bridge pier ductility.
For above-mentioned feature and advantage of the present invention can be become apparent, special embodiment below, and coordinate accompanying drawing, be described in detail below.
As shown in Fig. 1 ~ Fig. 9, the construction method of recovery technique after a kind of RC bridge pier shake, is characterized in that, carry out according to the following steps:
(1) make variable cross-section reinforcement, reinforcing bar is become variable cross-section reinforcement by variable cross-section process;
(2) concrete that territory, Pier is destroyed is cut, until expose bridge pier longitudinal reinforcement;
(3) destruction of original for areas of plasticity hinge reinforcing bar part is removed;
(4) use the form of jam weld, welded by preprepared variable cross-section reinforcement with original reinforcing bar, formwork erection after welding is good, concreting restores pier shaft, and carries out maintenance, reaches form removal after strength of mould stripping until concrete;
(5) after the reparation of restoring area concreting, outsourcing FRP bar belt construction is carried out to bridge pier, complete reparation.
In the present embodiment, in step (1), described reinforcing bar is the reinforcing bar identical with raw steel muscle or stainless steel rebar.
In the present embodiment, in step (1), described variable cross-section reinforcement is the reinforcing bar that sectional dimension is different.
In the present embodiment, in step (1), the effective length of variable cross-section section and the control of link length to be paid close attention in variable cross-section reinforcement processing, should determine in strict accordance with designing and calculating.
In the present embodiment, in step (2), cut concrete scope and determine according to Plastic hinge length, and consider that variable cross-section reinforcement two ends connect the length needed.
In the present embodiment, in step (3), original reinforcing bar removes position and should interlock.
In the present embodiment, in step (4), the position of adjacent variable cross-section reinforcement variable cross-section needs at sustained height.
In the present embodiment, in step (5), described FRP band is CFRP band.
In the present embodiment, according to job site situation and construction actual needs, width and the thickness of variable cross-section reinforcement effective length, total length and outsourcing FRP band is determined.
Above-listed preferred embodiment; the object, technical solutions and advantages of the present invention are further described; be understood that; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention; within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a construction method for the rear recovery technique of RC bridge pier shake, is characterized in that, carry out according to the following steps:
(1) make variable cross-section reinforcement, reinforcing bar is become variable cross-section reinforcement by variable cross-section process;
(2) cut the concrete that territory, Pier is destroyed, until expose bridge pier longitudinal reinforcement, cut concrete scope and determine according to Plastic hinge length, and consider that variable cross-section reinforcement two ends connect the length needed;
(3) destruction of original for areas of plasticity hinge reinforcing bar part is removed;
(4) use the form of jam weld, welded by preprepared variable cross-section reinforcement with original reinforcing bar, formwork erection after welding is good, concreting restores pier shaft, and carries out maintenance, reaches form removal after strength of mould stripping until concrete;
(5) after the reparation of restoring area concreting, outsourcing FRP bar belt construction is carried out to bridge pier, complete reparation.
2. the construction method of the rear recovery technique of RC bridge pier shake according to claim 1, it is characterized in that: in step (1), described reinforcing bar is the reinforcing bar identical with raw steel muscle or stainless steel rebar.
3. the construction method of the rear recovery technique of RC bridge pier shake according to claim 1, it is characterized in that: in step (1), described variable cross-section reinforcement is the reinforcing bar that sectional dimension is different.
4. the construction method of the rear recovery technique of RC bridge pier shake according to claim 1, is characterized in that: in step (1), will pay close attention to the effective length of variable cross-section section and the control of link length, should determine in strict accordance with designing and calculating in variable cross-section reinforcement processing.
5. the construction method of the rear recovery technique of RC bridge pier shake according to claim 1, is characterized in that: in step (2), cuts concrete scope and determine according to Plastic hinge length, and consider that variable cross-section reinforcement two ends connect the length needed.
6. the construction method of the rear recovery technique of RC bridge pier shake according to claim 1, it is characterized in that: in step (3), original reinforcing bar removes position and should interlock.
7. the construction method of the rear recovery technique of RC bridge pier shake according to claim 1, it is characterized in that: in step (4), the position of adjacent variable cross-section reinforcement variable cross-section needs at sustained height.
8. the construction method of the rear recovery technique of RC bridge pier shake according to claim 1, it is characterized in that: in step (5), described FRP band is CFRP band.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107190634A (en) * | 2017-06-08 | 2017-09-22 | 上海应用技术大学 | A kind of method of rapid construction bridge pier after macroseism shifted based on plastic hinge |
| CN108396663A (en) * | 2018-04-11 | 2018-08-14 | 天津大学 | Bridge pier prosthetic device based on light-duty prestressing force stainless steel sheath and restorative procedure |
| CN108824695A (en) * | 2018-03-27 | 2018-11-16 | 同济大学 | FRP tendons beams of concrete with ductility and preparation method thereof |
| CN110029596A (en) * | 2019-05-22 | 2019-07-19 | 福州大学 | Combined type bridge pier seismic reinforcing structure and its construction method |
| CN110067212A (en) * | 2019-05-07 | 2019-07-30 | 防灾科技学院 | Fast repairing method after a kind of shake of reinforced concrete bridge pier |
| CN112446082A (en) * | 2020-11-27 | 2021-03-05 | 广西交科集团有限公司 | Calculation method for repairing post-earthquake damaged reinforced concrete pier through CFRP |
| CN113882283A (en) * | 2021-08-29 | 2022-01-04 | 北京工业大学 | Existing pier seismic transformation construction method based on low-damage concept |
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| CN108824695B (en) * | 2018-03-27 | 2023-09-19 | 同济大学 | FRP rib concrete beam with ductility and preparation method thereof |
| CN108396663A (en) * | 2018-04-11 | 2018-08-14 | 天津大学 | Bridge pier prosthetic device based on light-duty prestressing force stainless steel sheath and restorative procedure |
| CN110067212A (en) * | 2019-05-07 | 2019-07-30 | 防灾科技学院 | Fast repairing method after a kind of shake of reinforced concrete bridge pier |
| CN110029596A (en) * | 2019-05-22 | 2019-07-19 | 福州大学 | Combined type bridge pier seismic reinforcing structure and its construction method |
| CN110029596B (en) * | 2019-05-22 | 2024-02-06 | 福州大学 | Composite pier anti-seismic reinforcing structure and construction method thereof |
| CN112446082A (en) * | 2020-11-27 | 2021-03-05 | 广西交科集团有限公司 | Calculation method for repairing post-earthquake damaged reinforced concrete pier through CFRP |
| CN113882283A (en) * | 2021-08-29 | 2022-01-04 | 北京工业大学 | Existing pier seismic transformation construction method based on low-damage concept |
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