CN210482020U - Pier bottom structure of low pier rigid frame bridge capable of greatly reducing bearing bending moment - Google Patents
Pier bottom structure of low pier rigid frame bridge capable of greatly reducing bearing bending moment Download PDFInfo
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- CN210482020U CN210482020U CN201920845681.XU CN201920845681U CN210482020U CN 210482020 U CN210482020 U CN 210482020U CN 201920845681 U CN201920845681 U CN 201920845681U CN 210482020 U CN210482020 U CN 210482020U
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- 238000005452 bending Methods 0.000 title claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 80
- 239000010959 steel Substances 0.000 claims abstract description 80
- 229910000870 Weathering steel Inorganic materials 0.000 claims description 2
- 230000002277 temperature effect Effects 0.000 abstract description 5
- 238000005336 cracking Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 4
- 238000010008 shearing Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
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Abstract
The structure of the bottom of the short-pier rigid-frame bridge bearing bending moment can be greatly reduced, so that the shrinkage and creep of concrete, the temperature effect and the section bending moment near the bottom of the short-pier rigid-frame bridge under the live load effect are greatly reduced, the cracking of the concrete near the bottom of the short-pier is avoided or the crack width of the concrete is greatly reduced, the durability of the structure is ensured, and the application range of the continuous rigid-frame bridge is expanded. Including pier and basic cushion cap, pier upper end, lower extreme concretize characterized by with bridge girder, basic cushion cap respectively: the pier is divided into two sections, namely an upper pier section and a lower pier section, at the position adjacent to the bottom of the pier, and a circular seam is formed between the corresponding end surfaces of the upper pier section and the lower pier section; and a steel plate hinge bearing vertical axial force is arranged between the upper part of the pier and the lower part of the pier, and the steel plate hinge vertically extends into the upper part of the pier and the lower part of the pier and is fixedly connected with the upper part of the pier and the lower part of the pier.
Description
Technical Field
The utility model belongs to the technical field of bridge engineering, in particular to can reduce substantially and bear the pier bottom structure of short mound rigid frame bridge of moment of flexure.
Background
In recent years, along with the development of the transportation industry of China, people put forward higher and higher requirements on bridge engineering, and the continuous rigid frame bridge has the advantages that the bending moment of the main beam is reduced, large-tonnage supports are not needed between the main pier and the main beam, and the like, because the main beam and the piers do not have the supports, so that the continuous rigid frame bridge is widely constructed. However, compared with a continuous beam, a continuous rigid frame bridge requires a pier with a higher height, otherwise, the bending moment at the bottom of the pier is particularly large after the main beam and the pier are rigidly connected, so that the concrete of the pier is pulled to crack, and the durability of the structure is affected.
The main structure of the continuous rigid frame bridge is characterized in that a main beam is continuous and a pier beam is solidified, although the flexural rigidity along the bridge direction and the torsional rigidity along the transverse bridge direction can well meet the stress requirement of a bridge with a larger span, the pier is required to bear larger bending moment, and in order to ensure that the bending moment generated at the pier bottom can not cause the crack width of pier concrete to be too large, the pier of the common continuous rigid frame bridge is higher so as to reduce the pier bottom bending moment.
Due to the characteristics of the continuous rigid frame bridge, if the continuous rigid frame bridge is built on a complex terrain with short piers, the piers bear large bending moment, and the problem of pier cracking is very serious. The biggest defect of the low pier rigid frame bridge is that the bending moment borne by the pier bottom is large, and the tensile stress of concrete exceeds the tensile strength of the concrete to generate cracks, so that the durability of the structure is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a can reduce substantially and bear pier bottom structure of the short pier rigid frame bridge of moment of flexure to reduce the shrinkage of concrete greatly and creep, temperature effect and live load effect down near the section moment of flexure at the bottom of the short pier rigid frame bridge pier, avoid near the bottom of the short pier concrete crack or reduce its crack width greatly, guarantee the durability of structure, and enlarge the application scope of continuous rigid frame bridge.
The utility model provides a technical scheme that its technical problem adopted as follows:
the utility model discloses a can reduce by a wide margin the pier bottom structure of the short mound rigid frame bridge who bears the moment of flexure, including pier and basic cushion cap, pier upper end, lower extreme concreties characterized by with bridge girder, basic cushion cap respectively: the pier is divided into two sections, namely an upper pier section and a lower pier section, at the position adjacent to the bottom of the pier, and a circular seam is formed between the corresponding end surfaces of the upper pier section and the lower pier section; and a steel plate hinge bearing vertical axial force is arranged between the upper part of the pier and the lower part of the pier, and the steel plate hinge vertically extends into the upper part of the pier and the lower part of the pier and is fixedly connected with the upper part of the pier and the lower part of the pier.
The height h of the circular seam is 2-4 cm.
The main body of the steel plate hinge is a vertical integral steel plate, the upper section and the lower section of the vertical integral steel plate respectively extend into the upper part and the lower part of the pier, a shear structure is arranged in the range of the section and the lower section of the vertical integral steel plate, and the shear structure is effectively solidified with concrete on the upper part and the lower part of the pier to form a steel-concrete combined structure.
The shear resistant structure comprises shear nails uniformly distributed on the front and back plate surfaces of the vertical integral steel plate within the range of the upper section and the lower section of the vertical integral steel plate, and shear nails vertically distributed at intervals on the side surfaces of two sides of the vertical integral steel plate within the range of the lower section, wherein each shear nail is welded with the vertical integral steel plate body.
The shear structure is shear nails uniformly distributed on the plate body in the range of the upper section and the lower section of the vertical integral steel plate, and steel plates with holes and the like can also be adopted as the shear structure.
The beneficial effects of the utility model are that:
the method comprises the following steps that firstly, a pier is disconnected at a position close to the bottom of the pier to form two sections of the upper part of the pier and the lower part of the pier, a circular seam is formed between corresponding end faces of the upper part of the pier and the lower part of the pier, a steel plate hinge bearing vertical axial force is arranged, the height of the section of the pier close to the position of the steel plate hinge is very small, and the bending rigidity of the section is very small, so that the section bending moment close to the bottom of the short pier rigid frame bridge under the action of temperature effect and live load can be effectively released, and the;
secondly, pier bending moment caused by concrete shrinkage and creep, temperature effect and traffic live load is greatly reduced, cracking of concrete near the bottom of the short pier is avoided, or the crack width of the concrete is greatly reduced, so that the concrete crack at the bottom of the rigid frame pier meets the design requirement;
thirdly, because the height of the circular seam between the upper part of the pier and the end surface of the lower part of the pier is very small, the instability of a steel plate hinge under a large vertical axial force can be avoided, in addition, the horizontal shearing force of the continuous rigid frame is also small, and the shearing resistance of a thick steel plate is reasonable, so that the safety of the structure of the low-pier rigid frame bridge can be ensured;
the steel plate hinges are connected in a welding mode, construction difficulty is low, the stability of the steel plate hinges and effective consolidation of the steel plate hinges with concrete structures on the upper portion of a bridge pier and the lower portion of the bridge pier are enhanced through the shear resistant structure, and safety of a continuous rigid frame bridge structure is guaranteed;
fifthly, the steel plate hinge member can be made of weathering resistant steel, so that the maintenance can be avoided, and the durability and reliability of the structure can be ensured;
sixthly, the technical problem of building the low pier rigid frame bridge under the condition of complex terrain is effectively solved, the application range of the continuous rigid frame bridge is expanded, and the technical and economic benefits are very obvious.
Drawings
The specification includes the following five figures:
FIG. 1 is a vertical view of the short pier rigid frame bridge with greatly reduced bending moment;
FIG. 2 is an enlarged view of portion A of FIG. 1;
FIG. 3 is a cross-bridge vertical view of the bottom structure of a rigid-frame low pier bridge with greatly reduced bending moment;
FIG. 4 is a front view of a steel plate hinge in the bottom structure of a low pier rigid frame bridge capable of greatly reducing the bearing bending moment;
FIG. 5 is a side view of a steel plate hinge in the bottom structure of a low pier rigid frame bridge capable of greatly reducing the bearing bending moment of the present invention;
the figures show the components and corresponding references: the bridge pier comprises an upper bridge pier portion 12, a lower bridge pier portion 11, a foundation bearing platform 20, a circular seam 13, a height h, a vertical integral steel plate 30, a transverse steel plate 31, shear nails 32 and lateral shear nails 33.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
Referring to fig. 1 and 2, the utility model discloses a can reduce substantially the pier bottom structure of the short pier rigid frame bridge who bears the moment of flexure, including pier and basic cushion cap 20, pier upper end, lower extreme concretize with bridge girder, basic cushion cap 20 respectively. The pier is divided into an upper pier part 12 and a lower pier part 11 at the position close to the bottom of the pier, and a circular seam 13 is formed between the corresponding end surfaces of the upper pier part 12 and the lower pier part 11. And a steel plate hinge bearing vertical axial force is arranged between the upper pier part 12 and the lower pier part 11, and the steel plate hinge vertically extends into the upper pier part 12 and the lower pier part 11 and is fixedly connected with the upper pier part and the lower pier part. Referring to fig. 3, a circular seam 13 is formed between the corresponding end surfaces of the upper pier portion 12 and the lower pier portion 11, the height of the circular seam is h, so that the height of the section of the pier near the hinge position of the steel plate becomes very small, the bending rigidity of the section is very small, the contraction and creep of concrete are greatly reduced, the bending moment of the section near the bottom of the short pier rigid bridge under the action of temperature effect and live load is greatly reduced, the cracking of the concrete near the bottom of the short pier is avoided, or the crack width of the concrete is greatly reduced, and the crack of the bottom of the rigid bridge pier meets the design requirement.
Referring to fig. 2, the height h of the circular seam 13 is generally 2-4cm, as long as it is ensured that the steel plate leaking out of the concrete does not buckle and become unstable. Because the height h between the end faces of the upper part 12 and the lower part 11 of the pier is very small, the phenomenon that the steel plate is hinged under a large vertical axial force cannot be unstable can be avoided, in addition, the steel plate can bear a certain horizontal shearing force, and the safety of the low pier rigid frame bridge structure is ensured.
Referring to fig. 1 and 3, the main body of the steel plate hinge is a vertical integral steel plate 30, the upper section and the lower section of the vertical integral steel plate 30 extend into the upper part 12 of the pier and the lower part 11 of the pier respectively, a shear structure is arranged in the range of the upper section and the lower section on the plate body of the vertical integral steel plate 30, and the shear structure is effectively solidified with concrete on the upper part 12 of the pier and the lower part 11 of the pier to form a steel-concrete composite structure. The vertical integral steel plate 30 is not provided with a shear structure on the plate body of the exposed part in the annular gap 13.
Referring to fig. 1 and 5, in order to facilitate the construction and positioning of the vertical integral steel plate 30, a horizontal steel plate 31 is welded and fixed on the bottom edge of the vertical integral steel plate 30 as a positioning structure, and other positioning measures may also be adopted. The vertical integral steel plate 30 and the transverse steel plate 31 in the steel plate hinge are connected in a welding mode, construction difficulty is low, axial force transmission between the steel plate 30 and concrete is completed through the shear-resistant structure, stability of the steel plate 30 in the concrete and effective solidification of the steel plate with concrete structures on the upper portion of a pier and the lower portion of the pier are guaranteed, and safety of a continuous rigid frame bridge structure is guaranteed.
The shear structure can adopt various structures, and shown in fig. 1, 3, 4 and 5 are shear nails 32 welded on the vertical integral steel plate 30, that is, the shear structure comprises shear nails 32 uniformly distributed on the front and back plate surfaces of the vertical integral steel plate 30 in the upper and lower section ranges, and shear nails 32 vertically distributed at intervals on the side surfaces of the two sides of the vertical integral steel plate 30 in the lower section ranges, and each shear nail 32 is welded with the plate body of the vertical integral steel plate 30. The arrangement of the shear pins 32 is also only illustrated, and the thickness and size of the vertical integral steel plate 30, the number and arrangement of the shear pins 32 are determined by the axial force of the pier required in specific application. The shear pins 32 may be replaced by shear keys of other configurations, such as perforated steel plates.
Referring to fig. 1 and 2, the vertical integral steel plate 30 is disposed on an axis of a pier, and a plate surface thereof is perpendicular to a forward bridge direction. The vertical integral steel plate 30 and the horizontal steel plate 31 in the steel plate hinge can be made of common steel plates, but in order to reduce the maintenance of the steel plate hinge, the vertical integral steel plate 30 and the horizontal steel plate 31 are preferably made of weathering steel.
The utility model discloses effectively solve the difficult technical problem who builds low mound rigid frame bridge under the complicated topography condition, enlarged the application scope of continuous rigid frame bridge, technological economic benefits is very showing.
Referring to fig. 1 and 3, during construction, the steel plate is fixed by hinges, then a template is manufactured, concrete is poured, and the lower section and the upper section of the steel plate hinge are embedded in the concrete of the lower part 11 and the upper part 12 of the pier. The formwork erection is to ensure that the upper pier part 12 and the lower pier part 11 are separated, and the concrete is poured by fully vibrating to ensure the compactness among the vertical integral steel plate 30, the transverse steel plate 31, the shear nails 32 and the concrete.
The above is only illustrated by the drawings, the present invention is not intended to limit the present invention to the specific structure and application range shown and described, so all the modifications and equivalents that may be utilized belong to the scope of the present invention.
Claims (7)
1. Can reduce the pier bottom structure of the short pier rigid frame bridge that bears the moment of flexure by a wide margin, including pier and basic cushion cap (20), pier upper end, lower extreme concreties characterized by with bridge girder, basic cushion cap (20) respectively: the pier is divided into an upper pier part (12) and a lower pier part (11) at the position close to the bottom of the pier, and a circular seam (13) is formed between the corresponding end surfaces of the upper pier part (12) and the lower pier part (11); and a steel plate hinge bearing vertical axial force is arranged between the upper pier part (12) and the lower pier part (11), and the steel plate hinge vertically extends into the upper pier part (12) and the lower pier part (11) and is fixedly connected with the upper pier part and the lower pier part.
2. The pier bottom structure of the short pier rigid frame bridge capable of greatly reducing the bearing bending moment as claimed in claim 1, which is characterized in that: the height h of the circular seam (13) is 2-4 cm.
3. The pier bottom structure of the short pier rigid frame bridge capable of greatly reducing the bearing bending moment as claimed in claim 1, which is characterized in that: the main body of the steel plate hinge is a vertical integral steel plate (30), the upper section and the lower section of the vertical integral steel plate (30) extend into the upper part (12) of the pier and the lower part (11) of the pier respectively, a shear structure is arranged in the range of the upper section and the lower section of the vertical integral steel plate (30), and the shear structure is effectively solidified with concrete on the upper part (12) of the pier and the lower part (11) of the pier to form a steel-concrete combined structure.
4. The pier bottom structure of the short pier rigid frame bridge capable of greatly reducing the bearing bending moment as claimed in claim 3, which is characterized in that: the shear structure comprises shear nails (32) which are uniformly distributed on the front and back plate surfaces of the vertical integral steel plate (30) within the range of the upper section and the lower section, and shear nails (32) which are vertically distributed at intervals on the side surfaces of two sides of the vertical integral steel plate within the range of the lower section, wherein each shear nail (32) is welded with the plate body of the vertical integral steel plate (30).
5. The pier bottom structure of the short pier rigid frame bridge capable of greatly reducing the bearing bending moment as claimed in claim 3, which is characterized in that: and a transverse steel plate (31) is fixedly welded on the bottom surface of the vertical integral steel plate (30).
6. The pier bottom structure of the short pier rigid frame bridge capable of greatly reducing the bearing bending moment as claimed in claim 5, which is characterized in that: the vertical integral steel plate (30) and the transverse steel plate (31) are made of weathering steel.
7. The pier bottom structure of the short pier rigid frame bridge capable of greatly reducing the bearing bending moment as claimed in claim 3, which is characterized in that: the vertical integral steel plate (30) is arranged on the axis of the pier, and the plate surface of the vertical integral steel plate is perpendicular to the bridge direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920845681.XU CN210482020U (en) | 2019-06-05 | 2019-06-05 | Pier bottom structure of low pier rigid frame bridge capable of greatly reducing bearing bending moment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920845681.XU CN210482020U (en) | 2019-06-05 | 2019-06-05 | Pier bottom structure of low pier rigid frame bridge capable of greatly reducing bearing bending moment |
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| Publication Number | Publication Date |
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| CN210482020U true CN210482020U (en) | 2020-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920845681.XU Withdrawn - After Issue CN210482020U (en) | 2019-06-05 | 2019-06-05 | Pier bottom structure of low pier rigid frame bridge capable of greatly reducing bearing bending moment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110306425A (en) * | 2019-06-05 | 2019-10-08 | 中铁二院工程集团有限责任公司 | The pier bottom construction for bearing the squat pier rigid frame bridge of moment of flexure can significantly be reduced |
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2019
- 2019-06-05 CN CN201920845681.XU patent/CN210482020U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110306425A (en) * | 2019-06-05 | 2019-10-08 | 中铁二院工程集团有限责任公司 | The pier bottom construction for bearing the squat pier rigid frame bridge of moment of flexure can significantly be reduced |
| CN110306425B (en) * | 2019-06-05 | 2024-03-22 | 中铁二院工程集团有限责任公司 | Pier bottom structure of short pier rigid frame bridge capable of greatly reducing bearing bending moment |
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