CN113718639B - Double-column type prefabricated swing pier multiple shock-absorbing structure system with replaceable prestressed tendons - Google Patents
Double-column type prefabricated swing pier multiple shock-absorbing structure system with replaceable prestressed tendonsInfo
- Publication number
- CN113718639B CN113718639B CN202110988595.6A CN202110988595A CN113718639B CN 113718639 B CN113718639 B CN 113718639B CN 202110988595 A CN202110988595 A CN 202110988595A CN 113718639 B CN113718639 B CN 113718639B
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- pier
- precast
- prestressed
- support
- structure system
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- 210000002435 tendon Anatomy 0.000 title claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 42
- 239000010959 steel Substances 0.000 claims abstract description 42
- 230000035939 shock Effects 0.000 claims abstract description 27
- 238000010521 absorption reaction Methods 0.000 claims abstract description 15
- 238000004873 anchoring Methods 0.000 claims abstract description 14
- 238000013016 damping Methods 0.000 claims abstract description 14
- 230000001681 protective effect Effects 0.000 claims description 7
- 239000004567 concrete Substances 0.000 claims description 4
- 239000011150 reinforced concrete Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims 1
- 230000008439 repair process Effects 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000006073 displacement reaction Methods 0.000 description 9
- 230000009471 action Effects 0.000 description 8
- 238000010276 construction Methods 0.000 description 8
- 238000009417 prefabrication Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The invention relates to a double-column type precast swing pier multiple shock absorption structure system with replaceable prestressed tendons, which comprises an upper bridge body, a bearing platform, a plurality of anchor backing plates, two precast piers, a plurality of prestressed steel bundles and a plurality of pile foundations, wherein the anchor backing plates are pre-embedded in the middle of the precast piers, the end parts of the anchor backing plates extend out of the precast piers to form anchoring positions, a plurality of vertical prestressed pipelines are arranged below the anchoring positions, a plurality of steering prestressed pipelines are arranged in the bearing platform, the vertical prestressed pipelines are communicated with the steering prestressed pipelines end to form a U-shaped prestressed pipeline, one end of each prestressed steel bundle is fixedly connected with the anchoring position of one anchor backing plate, the other end of each prestressed steel bundle sequentially passes through the vertical prestressed pipeline, the steering prestressed pipeline and the anchoring position of the other anchor backing plate to be fixedly connected, and a swinging interface is formed between the contact surfaces of the precast piers and the bearing platform. Compared with the prior art, the invention has the advantages of strong damping performance, convenient repair and overhaul, and the like.
Description
Technical Field
The invention relates to the field of bridges, in particular to a double-column type prefabricated swing pier multiple damping structure system with replaceable prestressed tendons.
Background
The prefabricated bridge pier is a new research hot spot in the rapid construction of bridges, but has poor integrity, weak anti-seismic performance of components and serious earthquake damage in the past major earthquakes. The dynamic response of the pier can be effectively reduced by adopting the shock absorption and insulation support, but the problem of out-of-control pier beam displacement exists under the strong shock effect. The prior art adopts a novel swinging-self-resetting bridge pier column system through research, verifies that under the action of prestress, the pier can reduce earthquake response through swinging and has a self-resetting function after an earthquake, but most of the research is based on a single pier test, and the swinging pier is applied to practical engineering and needs to solve several problems. Firstly, the unbonded prestressed tendons serving as key components are very key, the existing prestress usually adopts high-strength twisted steel bar straight-beam arrangement or steel strand U-shaped beam arrangement in the bridge pier, the prestress tensioning has higher requirements on construction space, and the bending radius of the prestress beams has higher limit on the bridge pier size. Secondly, the prestressed tendons have relaxation phenomenon, so that prestress loss can be brought, and the performance of the swinging-self-resetting bridge pier is seriously affected. In addition, research on swing-self-resetting structures is mostly conducted on single pier or pier beam nodes, and research on a double-column pier system is less. However, in order to solve the problem of urban traffic jam, the viaduct using the double-column pier as the main bearing member has a larger specific gravity in urban bridge construction, and the problem of damping by the double-column pier is also to be considered. Finally, the swinging system proposed at present does not relate to a support, the pier beams are often connected or fixedly connected by adopting shear keys, the swinging system is not suitable for the situation of assembled small box beams or T beams, and the hidden danger of insufficient stability of the swinging angle of the pier bottom under the strong vibration effect exists even if the swinging system is adopted. In summary, the current seismic reduction and isolation support system and the prefabricated swing pier system cannot meet the seismic requirements of some practical projects.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a double-column type prefabricated swing pier multiple shock absorption structure system with replaceable prestressed tendons.
The aim of the invention can be achieved by the following technical scheme:
The double-column type precast swing pier multiple damping structure system with replaceable prestressed tendons comprises an upper bridge body, a bearing platform, a plurality of anchor backing plates, two precast piers, a plurality of prestressed steel bundles and a plurality of pile foundations, wherein the top surface of the pile foundations is fixedly connected with the bottom surface of the bearing platform, the precast piers are vertically arranged on the bearing platform, the top surface of the precast pier is fixedly connected with the bottom surface of the upper bridge body,
The anchor backing plate pre-buried in the middle part of prefabricating the pier, the tip of anchor backing plate stretch out the prefabricating the pier and form the anchor position, anchor position below be equipped with a plurality of vertical prestressing force pipelines, the cushion cap in be equipped with a plurality of prestressing force pipelines that turn to, vertical prestressing force pipeline and the prestressing force pipeline intercommunication of turning to form U type prestressing force pipeline head and the tail, the one end of prestressing force steel beam with the anchor fixed connection of an anchor backing plate, the other end pass vertical prestressing force pipeline in proper order, turn to prestressing force pipeline, the anchor fixed connection of another anchor backing plate behind vertical prestressing force pipeline, the contact surface of prefabricating the pier and cushion cap between form the interface that sways.
Preferably, the structure system further comprises a shear pin, the shear pin is arranged between the contact surface of the prefabricated pier and the bearing platform, a shear pin hole is formed in the top surface of the bearing platform, the top of the shear pin is connected with the prefabricated pier, and the bottom of the shear pin is arranged in the shear pin hole.
Preferably, the structural system comprises four prestressed steel bundles, the ends of which are respectively connected with the anchoring sites of the anchor pad.
Preferably, the anchoring part is provided with a prestress perforation, and the end part of the prestress steel beam upwards passes through the prestress perforation and is connected with the anchor backing plate in an anchoring way.
Preferably, the prestressed steel bundles are unbonded prestressed steel bundles.
Preferably, the structural system further comprises a protective cover, wherein the protective cover is arranged on the anchoring position.
Preferably, the upper bridge body comprises a main beam and a prefabricated cover beam, wherein the bottom surfaces of the prefabricated cover beams are fixedly connected with the top surfaces of the two prefabricated bridge piers respectively, and the main beam is arranged on the prefabricated cover beam.
Preferably, the upper bridge body further comprises a guy cable shock absorption support, and the guy cable shock absorption support is arranged between the main beam and the prefabricated cover beam.
Preferably, the cable shock attenuation support include support roof, support bottom plate, support core and a plurality of cable, the top surface and the support roof fixed connection of support core, the bottom surface and the support bottom plate fixed connection of support core, the side fixed connection of one end and the support roof of cable, the side fixed connection of the other end and support bottom plate.
Preferably, the prefabricated pier is a reinforced concrete structure, and comprises a vertically arranged steel bar, hoops which are hooped on the periphery of the steel bar and a concrete main body formed after the hoops are poured.
Compared with the prior art, the invention has the following advantages:
1) The invention is based on the cable damping support and is provided with the swinging interface to realize multiple damping effects, so that the earthquake action born by the structure is reduced on the premise of ensuring that the structure system has enough strength and rigidity, the effective energy consumption capability and the self-resetting capability are provided, the problems of serious damage and large residual deformation of the traditional double-column pier structure system after the earthquake action can be solved, the invention is effectively applied to the bridge scene of a double-column pier, and along with the increase of the earthquake strength, the invention can damp by the cable damping support and enables the pier to enter a swinging state for multiple damping by the swinging interface, thereby effectively improving the damping effect, improving the earthquake resistance of the bridge and being easy to repair after the earthquake, expanding the application range of the cable damping support and the swinging pier, and having low construction difficulty and good economic benefit;
2) The U-shaped prestressed steel bundles outside the pier are arranged in the side surfaces and the bearing platforms of the prefabricated pier, so that the requirements on the size of the pier are reduced, the length and the reinforcement are not required to be increased in the prefabricated pier, the steel bundle consumption is reduced, the occupied area of the pier is not increased, the utilization of the road passing space under the viaduct is not influenced, and the U-shaped prestressed steel bundles are arranged on the two sides of the pier, so that the prefabricated pier is convenient to construct, overhaul, repair, stretch and change.
Drawings
FIG. 1 is a schematic side view of a transverse bridge of the present invention;
FIG. 2 is a schematic side view of a longitudinal bridge of the present invention;
FIG. 3 is a schematic cross-sectional view of a prefabricated swing pier according to the present invention;
Fig. 4 is a schematic structural view of the cable shock mount of the present invention.
Wherein, 1, a main beam, 2, a inhaul cable shock absorption support, 21, a support top plate, 22, a support bottom plate, 23, a support core, 24, an inhaul cable, 3, a prefabricated capping beam, 4, a prefabricated bridge pier, 5, a shear pin, 6 and a bearing platform, 7, a prestress steel beam, 8, a swinging interface, 9, a protective cover, 10, an anchor backing plate, 11, a pile foundation, 12, steel bars, 13, concrete, 14, stirrups, 15, a vertical prestress pipeline, 16 and a steering prestress pipeline.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. Note that the following description of the embodiments is merely an example, and the present invention is not intended to be limited to the applications and uses thereof, and is not intended to be limited to the following embodiments.
Examples
In order to solve the problem that the shock resistance of the double-column type precast pier 4 is insufficient, the swing pier system and the shock absorption and isolation support system cannot completely meet the shock resistance requirement, the invention provides the double-column type precast swing pier multiple shock absorption structure system with replaceable prestress ribs, which can reduce the earthquake action born by the structure and provide effective energy consumption capability and self-resetting capability on the premise of ensuring the structure system to have enough strength and rigidity, can solve the problems of serious damage and serious residual deformation after the earthquake action of the traditional double-column type pier structure system, has convenient construction of U-shaped prestress beams, has little requirement on the pier column size, is convenient to detect after the earthquake, is convenient to maintain and replace, and realizes shock resistance toughness.
Specifically, as shown in fig. 1 to 3, the structural system of the present invention comprises an upper bridge body, a bearing platform 6, a shear pin 5, a plurality of anchor pads 10, two precast piers 4, a plurality of prestressed steel bundles 7 and a plurality of pile foundations 11. In the main structure, the top surface of pile foundation 11 and the bottom surface fixed connection of cushion cap 6, on the cushion cap 6 was vertically located to precast pier 4, the top surface of precast pier 4 and the bottom surface fixed connection of upper portion bridge body, prestressed steel bundle 7 adopts unbonded prestressed steel bundle in this embodiment, precast pier 4 is reinforced concrete structure, precast pier 4 includes the reinforcing bar 12 of vertical setting, hoop is located the stirrup 14 of reinforcing bar 12 week side and is formed concrete 13 main part after the watering, in this embodiment, the cross-section of precast pier 4 is the rectangle, also can select other shapes such as circular according to actual conditions.
Specifically, in order to realize the removable installation of prestressing force steel bundle 7, anchor backing plate 10 is pre-buried in the middle part of prefabrication pier 4, anchor backing plate 10's tip stretches out prefabrication pier 4 and forms the anchor position, be equipped with a plurality of vertical prestressing force pipelines 15 below the anchor position, be equipped with a plurality of steering prestressing force pipelines 16 in the cushion cap 6, the upper surface of cushion cap 6 is located at the both ends of steering prestressing force pipeline 16, the main part of steering prestressing force pipeline 16 forms the corner in cushion cap 6 internal turning, vertical prestressing force pipeline 15 and steering prestressing force pipeline 16 intercommunication all around form U type prestressing force pipeline, the one end of prestressing force steel bundle 7 and the anchor position fixed connection of one anchor backing plate 10, the other end passes vertical prestressing force pipeline 15 in proper order, steering prestressing force pipeline 16, behind the vertical prestressing force pipeline 15 with the anchor position fixed connection of another anchor backing plate 10, form rocking interface 8 between prefabrication pier 4 and the contact surface of cushion cap 6, the contact surface between prefabrication pier 4 and cushion cap 6 is located to the shear pin 5, the top surface of cushion cap 6 is equipped with the shear pin hole, the top and prefabrication pier 4 are located in the bottom of shear pin 5.
In addition, four prestress steel bundles 7 are arranged in the embodiment, four sets of U-shaped prestress pipelines are correspondingly arranged, eight anchor backing plates 10 are arranged, prestress perforation holes are formed in the anchor positions, two ends of the four prestress steel bundles 7 are respectively connected with the anchor positions of the anchor backing plates 10 on the side faces of the pier body of the prefabricated pier 4 correspondingly, and the connection mode is that the end portions of the prestress steel bundles 7 upwards penetrate through the prestress perforation holes and are then connected with the anchor backing plates 10 in an anchoring mode.
In this embodiment, in order to protect the prestressed steel bundles 7 outside the prefabricated bridge pier 4, the structural system further includes a protective cover 9, and the protective cover 9 is covered on the anchoring position.
Based on the installation mode and the structural form of the prestress steel beam 7, the structural system provided by the invention can expand the application range of post-tensioned prestress connecting piers from the aspects of design and construction, does not increase extra design and construction difficulty, has engineering feasibility, and mainly shows the following points:
1. Two ends of the U-shaped prestress steel beam 7 are respectively anchored in the two precast piers 4, the curvature radius of the corner is larger, the prestress loss can be reduced, and the requirement on the size of the precast piers 4 is reduced;
2. The U-shaped prestress steel bundles 7 are anchored at two sides of the bottom of the pier body of the prefabricated pier 4, long reinforcement is not needed in the prefabricated pier 4, and the steel bundle consumption is reduced;
3. The U-shaped prestress steel bundles 7 are anchored at two sides of the pier body, so that the occupied width of the prefabricated pier 4 is not increased, and the utilization of the road passing space under the viaduct is not influenced;
4. The technology of the shear pins 5 and the like adopted by the bridge pier and the bearing platform 6 is mature, and the construction difficulty is not increased additionally.
In addition, as shown in fig. 1 and 4, in order to improve the anti-seismic performance of the invention, the upper bridge body comprises a main beam 1, a prefabricated capping beam 3 and a guy rope shock absorbing support 2, wherein the bottom surfaces of the prefabricated capping beams 3 are respectively and fixedly connected with the top surfaces of two prefabricated bridge piers 4, the main beam 1 is arranged on the prefabricated capping beams 3, and the guy rope shock absorbing support 2 is arranged between the main beam 1 and the prefabricated capping beams 3. Specifically, the cable shock absorbing support 2 comprises a support top plate 21, a support bottom plate 22, a support core 23 and a plurality of cables 24, wherein the top surface of the support core 23 is fixedly connected with the support top plate 21, the bottom surface of the support core 23 is fixedly connected with the support bottom plate 22, one end of each cable 24 is fixedly connected with the side surface of the support top plate 21, and the other end of each cable 24 is fixedly connected with the side surface of the support bottom plate 22. The main beam 1 of the present embodiment adopts a small box beam structure, and in other embodiments of the present invention, may be in the form of a T-beam, an integral box beam, or the like.
In order to improve the performance of the cable shock-absorbing support 2, the free travel of the cable 24 can be obtained according to the allowed pier beam displacement, and the shock-absorbing support core 23 can be a lead core support, a friction pendulum support, a combined rubber support and the like, which are determined according to practical engineering.
The working principle of the invention is as follows:
In the normal use state, the inhaul cable shock mount 2 can release temperature displacement, can satisfy the deformation requirement caused by temperature change in the normal use state, and reduces the internal force of the prefabricated bridge pier 4.
Under the action of small and medium earthquakes, the cable shock-absorbing support 2 yields to reduce earthquake response, the displacement of the main beam 1 is mainly provided by the cable shock-absorbing support 2, the horizontal inertial force transmitted to the lower structure is reduced, and the bridge pier keeps elasticity.
Along with the increase of the earthquake intensity, the displacement of the inhaul cable shock mount 2 is increased to the free travel of the inhaul cable 24, the inhaul cable 24 is tensioned, the displacement of the inhaul cable shock mount 2 is not increased any more, the further development of pier beam displacement is limited, and the problems of beam body collision, expansion joint damage, even beam falling damage and the like caused by the overlarge pier beam displacement are avoided; the tension of the inhaul cable 24 causes the internal force of the lower structure to be increased until the pier bottom bending moment exceeds the critical bending moment, so that the pier enters a swinging state, the period of the bridge structure is further prolonged, the input of seismic energy is isolated, and the multiple damping function is realized.
After the earthquake action, the restoring capability can be provided by the prestress rib and the self weight of the structure, and the residual displacement is reduced. The pier body basically keeps elasticity, the inhaul cable damping support 2 is simple to reset, and the U-shaped unbonded prestressed steel bundles anchored on the pier body are convenient to detect, repair, stretch and replace, so that quick repair after earthquake is realized. The invention has good working performance under normal use state and earthquake action, and is worth popularizing and using in actual engineering.
The above embodiments are merely examples, and do not limit the scope of the present invention. These embodiments may be implemented in various other ways, and various omissions, substitutions, and changes may be made without departing from the scope of the technical idea of the present invention.
Claims (6)
1. The double-column type precast swing pier multiple damping structure system with replaceable prestressed tendons is characterized by comprising an upper bridge body, a bearing platform (6), a plurality of anchor backing plates (10), two precast piers (4), a plurality of prestressed steel bundles (7) and a plurality of pile foundations (11), wherein the top surface of the pile foundations (11) is fixedly connected with the bottom surface of the bearing platform (6), the precast piers (4) are vertically arranged on the bearing platform (6), the top surface of the precast piers (4) is fixedly connected with the bottom surface of the upper bridge body,
The anchor backing plate (10) is pre-buried in the middle part of precast pier (4), the tip of anchor backing plate (10) stretch out precast pier (4) and form the anchor position, anchor position below be equipped with a plurality of vertical prestressing force pipelines (15), cushion cap (6) in be equipped with a plurality of direction changing prestressing force pipelines (16), vertical prestressing force pipeline (15) and direction changing prestressing force pipeline (16) intercommunication all around form U type prestressing force pipeline, the anchor position fixed connection of one anchor backing plate (10) of one end of prestressing force steel bundle (7), the anchor position fixed connection of another anchor backing plate (10) after passing vertical prestressing force pipeline (15), direction changing prestressing force pipeline (16), vertical prestressing force pipeline (15) in proper order with another anchor position fixed connection of anchor backing plate (10), the contact surface between precast pier (4) and cushion cap (6) form and sway interface (8);
The upper bridge body comprises a main beam (1) and a prefabricated capping beam (3), wherein the bottom surfaces of the prefabricated capping beams (3) are fixedly connected with the top surfaces of two prefabricated bridge piers (4) respectively, and the main beam (1) is arranged on the prefabricated capping beams (3);
the upper bridge body also comprises a guy cable shock absorption support (2), and the guy cable shock absorption support (2) is arranged between the main beam (1) and the prefabricated cover beam (3);
The stay rope damping support (2) comprises a support top plate (21), a support bottom plate (22), a support core body (23) and a plurality of stay ropes (24), wherein the top surface of the support core body (23) is fixedly connected with the support top plate (21), the bottom surface of the support core body (23) is fixedly connected with the support bottom plate (22), one end of each stay rope (24) is fixedly connected with the side surface of the support top plate (21), and the other end of each stay rope is fixedly connected with the side surface of the support bottom plate (22);
The structure system also comprises a shear pin (5), wherein the shear pin (5) is arranged between the contact surface of the prefabricated pier (4) and the bearing platform (6), a shear pin hole is formed in the top surface of the bearing platform (6), the top of the shear pin (5) is connected with the prefabricated pier (4), and the bottom of the shear pin (5) is arranged in the shear pin hole.
2. The double-column type precast swing pier multiple shock absorption structure system with replaceable prestress ribs according to claim 1, wherein the structure system comprises four prestress steel bundles (7), and the end parts of the four prestress steel bundles (7) are respectively connected with the anchoring positions of the anchor backing plates (10).
3. The double-column type precast swing pier multiple shock absorption structure system with the replaceable prestress ribs according to claim 1, wherein the anchoring position is provided with prestress perforation, and the end part of the prestress steel beam (7) passes through the prestress perforation upwards and is connected with an anchor backing plate (10) in an anchoring manner.
4. The double-column type precast swing pier multiple shock absorption structure system with replaceable prestressed tendons according to claim 1, wherein the prestressed steel bundles (7) are unbonded prestressed steel bundles.
5. The double-column type precast swing pier multiple shock absorption structure system with replaceable prestress ribs according to claim 1, wherein the structure system further comprises a protective cover (9), and the protective cover (9) is covered on the anchoring position.
6. The double-column type precast swing pier multiple shock absorption structure system with replaceable prestressed tendons, according to claim 1, is characterized in that the precast pier (4) is of a reinforced concrete structure, and the precast pier (4) comprises vertically arranged steel bars (12), hoops (14) hooped on the peripheral sides of the steel bars (12) and a concrete (13) main body formed after pouring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110988595.6A CN113718639B (en) | 2021-08-26 | Double-column type prefabricated swing pier multiple shock-absorbing structure system with replaceable prestressed tendons |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110988595.6A CN113718639B (en) | 2021-08-26 | Double-column type prefabricated swing pier multiple shock-absorbing structure system with replaceable prestressed tendons |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113718639A CN113718639A (en) | 2021-11-30 |
| CN113718639B true CN113718639B (en) | 2024-07-09 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN217174354U (en) * | 2021-08-26 | 2022-08-12 | 同济大学建筑设计研究院(集团)有限公司 | Double-column type prefabricated swing pier multiple damping structure system with replaceable prestressed tendons |
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN217174354U (en) * | 2021-08-26 | 2022-08-12 | 同济大学建筑设计研究院(集团)有限公司 | Double-column type prefabricated swing pier multiple damping structure system with replaceable prestressed tendons |
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