CN113356029A - Bridge shock-absorbing structure suitable for pile group foundation - Google Patents
Bridge shock-absorbing structure suitable for pile group foundation Download PDFInfo
- Publication number
- CN113356029A CN113356029A CN202110695731.2A CN202110695731A CN113356029A CN 113356029 A CN113356029 A CN 113356029A CN 202110695731 A CN202110695731 A CN 202110695731A CN 113356029 A CN113356029 A CN 113356029A
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- steel casing
- bearing platform
- foundation
- pile
- pile foundation
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
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- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a bridge damping structure suitable for a pile group foundation, which comprises a bridge pier, wherein a bearing platform is fixedly poured at the bottom of the bridge pier, and a pressure-bearing steel plate corresponding to the pile foundation at the bottom of the bearing platform is pre-embedded in the bearing platform; an outer steel casing with a downward cylinder opening is fixedly arranged at the bottom end of the pressure-bearing steel plate; the bottom of each outer steel casing penetrates out of the bottom end of the bearing platform, and each outer steel casing covers the top end of the pile foundation; the top of the pile foundation is fixedly provided with an inner steel casing wrapped outside the pile foundation; the inner steel casing is a cylinder without a bottom surface, and a radial gap is formed between the inner steel casing and the side wall of the outer steel casing. The invention aims to provide a shock absorption structure which can avoid rigid connection between a bearing platform and a pile foundation, has good shock absorption effect and is suitable for a pile group foundation in a bridge.
Description
Technical Field
The invention relates to the technical field of bridge seismic resistance, in particular to a bridge damping structure suitable for a pile group foundation.
Background
At present, commonly used bridge earthquake-resistant systems are mainly divided into a ductile earthquake-resistant system and an earthquake-reduction and isolation system. The common ductility earthquake-resistant system is realized by arranging a plastic hinge at the bottom or top of a pier. The seismic isolation and reduction system mainly consumes seismic energy by arranging seismic isolation supports or other energy consumption devices, so that the effect of seismic action is reduced. The common seismic isolation and reduction system is generally realized by arranging seismic isolation and reduction supports or other seismic isolation and reduction devices between the upper part and the lower part, and cannot be fused with a bridge structure. In the design of a bridge lower structure, a bearing platform and a pile foundation are often designed into a consolidation system, namely the bearing platform and a pile top are cast together through concrete to realize rigid connection, so that the installation of a seismic isolation and reduction device is inconvenient. Therefore, a shock-absorbing structure which can avoid rigid connection between a bearing platform and a pile foundation, has a good shock-absorbing effect and is suitable for a pile group foundation in a bridge is needed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a shock absorption structure which can avoid rigid connection between a bearing platform and a pile foundation, has good shock absorption effect and is suitable for a pile group foundation in a bridge.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a bridge damping structure suitable for pile group foundations comprises a bridge pier, wherein a bearing platform is fixedly poured at the bottom of the bridge pier, and a pressure-bearing steel plate corresponding to a pile foundation at the bottom of the bearing platform is pre-buried in the bearing platform; an outer steel casing with a downward cylinder opening is fixedly arranged at the bottom end of the pressure-bearing steel plate; the bottom of each outer steel casing penetrates out of the bottom end of the bearing platform, and each outer steel casing covers the top end of the pile foundation; the top of the pile foundation is fixedly provided with an inner steel casing wrapped outside the pile foundation; the inner steel casing is a cylinder without a bottom surface, and a radial gap is formed between the inner steel casing and the side wall of the outer steel casing.
Further, the outer diameter of the inner steel casing is equal to that of the pile foundation.
Further, the radial gap between the inner steel casing and the outer steel casing is 3-5 cm.
Further, the length of the inner steel casing and the length of the outer steel casing penetrating into the bearing platform are both 1.5 times of the diameter of the pile foundation.
Further, the length of the inner steel casing outside the bearing platform is 2 times larger than the diameter of the pile foundation.
Furthermore, the length of the outer steel casing penetrating out of the bottom of the bearing platform is more than 20 cm.
Compared with the prior art, the invention has the following beneficial effects:
the invention can reduce the scale and the number of the shock absorption and isolation devices between the bearing platform and the pile foundation, reduce the reinforcing steel bar distribution rate of the pier, save the manufacturing cost, and is more convenient and faster to construct compared with the shock absorption and isolation devices. Due to the fact that large compressive stress exists at the top end of the pile foundation, seismic energy is consumed through friction force between the top end of the pile foundation and the pressure bearing steel plate. Meanwhile, because the top end of the pile foundation is not rigidly fixed with the bearing platform, when an earthquake occurs, a radial gap exists between the inner steel casing and the outer steel casing to generate displacement, and steel exposed out of the part below the bearing platform through the outer steel casing deforms to consume certain earthquake energy and weaken the earthquake action effect, so that the bridge shock absorption effect is achieved, and the bridge pier and the upper structure are protected.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a schematic projection view of a steel casing on a bearing platform according to the present invention;
reference numerals:
1-pier, 2-pile foundation, 3-bearing platform, 4-bearing steel plate, 5-outer steel casing, 6-inner steel casing and 7-radial gap.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 and 2, a bridge damping structure suitable for a pile group foundation comprises a bridge pier 1, wherein a bearing platform 3 is fixedly cast at the bottom of the bridge pier 1, and a pressure-bearing steel plate 4 corresponding to a pile foundation at the bottom of the bearing platform 3 is embedded in the bearing platform 3; the bottom end of the pressure-bearing steel plate 4 is fixedly provided with an outer steel casing 5 with a downward cylinder opening; the bottom of the outer steel casing 5 penetrates through the bottom end of the bearing platform 3, and each outer steel casing 5 covers the top end of the pile foundation 2; the top of the pile foundation 2 is fixedly provided with an inner steel casing 6 wrapped outside the pile foundation 2; the inner steel casing 6 is a cylinder without a bottom surface, a radial gap is formed between the inner steel casing 6 and the side wall of the outer steel casing 5, the outer diameter of the inner steel casing 5 is equal to that of the pile foundation 2, and the radial gap between the inner steel casing 6 and the outer steel casing 5 is 3-5 cm.
The invention is suitable for drilling and pouring group pile foundations, and the inner steel casing 6 is sleeved on the top of the pile foundation 2 and has the same diameter as the pile foundation 2 at the lower side of the inner steel casing 6. The pressure-bearing steel plate 4 is welded with the outer steel casing 5, is arranged on the top of the outer steel casing 5 and is completely embedded into the bearing platform 3. The length of the inner steel casing 6 and the outer steel casing 5 penetrating into the bearing platform 3 is 1.5 times of the diameter of the pile foundation 2, so that the bearing platform 3 stably covers the top of the pile foundation 2. The exposed length of the lower part of the inner steel casing 6 is 2 times larger than the diameter of the pile foundation 2, and the exposed length of the lower part of the outer steel casing 5 is more than 20 cm. The overlapped part of the inner steel casing 6 and the outer steel casing 5 exposed out of the bearing platform 3 is used for reducing vertical seismic energy, when an earthquake occurs, a radial gap exists between the inner steel casing 6 and the outer steel casing 5 to generate displacement, and the steel exposed out of the part below the bearing platform 3 through the outer steel casing 5 deforms to consume the vertical seismic energy. Because the top end of the pile foundation 2 has larger compressive stress, horizontal seismic energy can be consumed through the friction force between the top end of the pile foundation 2 and the pressure-bearing steel plate 4, so that the seismic energy in two directions is absorbed, the shock absorption effect of the bridge is achieved, and the bridge pier 1 and the upper structure are protected.
The invention reduces the scale and the number of the shock absorption and isolation devices between the bearing platform and the pile foundation, reduces the reinforcing steel bar distribution rate of the pier, saves the manufacturing cost, and is convenient and fast to construct compared with the shock absorption and isolation devices.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. The utility model provides a bridge shock-absorbing structure suitable for pile group basis, includes the pier, its characterized in that: a bearing platform is fixedly poured at the bottom of the pier, and a pressure-bearing steel plate corresponding to a pile foundation at the bottom of the bearing platform is pre-embedded in the bearing platform; an outer steel casing with a downward cylinder opening is fixedly arranged at the bottom end of the pressure-bearing steel plate; the bottom of each outer steel casing penetrates out of the bottom end of the bearing platform, and each outer steel casing covers the top end of the pile foundation; the top of the pile foundation is fixedly provided with an inner steel casing wrapped outside the pile foundation; the inner steel casing is a cylinder without a bottom surface, and a radial gap is formed between the inner steel casing and the side wall of the outer steel casing.
2. The bridge damping structure suitable for the pile group foundation of claim 1, wherein: the outer diameter of the inner steel casing is equal to that of the pile foundation.
3. The bridge damping structure suitable for the pile group foundation of claim 1, wherein: and the radial gap between the inner steel casing and the outer steel casing is 3-5 cm.
4. The bridge damping structure suitable for the pile group foundation of claim 1, wherein: the length of the inner steel casing and the length of the outer steel casing penetrating into the bearing platform are both 1.5 times of the diameter of the pile foundation.
5. The bridge damping structure suitable for the pile group foundation of claim 4, wherein: the length of the inner steel casing outside the bearing platform is 2 times larger than the diameter of the pile foundation.
6. The bridge damping structure suitable for the pile group foundation of claim 4, wherein: the length of the outer steel casing penetrating out of the bottom of the bearing platform is more than 20 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110695731.2A CN113356029A (en) | 2021-06-22 | 2021-06-22 | Bridge shock-absorbing structure suitable for pile group foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110695731.2A CN113356029A (en) | 2021-06-22 | 2021-06-22 | Bridge shock-absorbing structure suitable for pile group foundation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113356029A true CN113356029A (en) | 2021-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110695731.2A Withdrawn CN113356029A (en) | 2021-06-22 | 2021-06-22 | Bridge shock-absorbing structure suitable for pile group foundation |
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| Country | Link |
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| CN (1) | CN113356029A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000120079A (en) * | 1998-10-16 | 2000-04-25 | Ohbayashi Corp | Base isolation structure of pile |
| JP2003027502A (en) * | 2001-07-13 | 2003-01-29 | Kubota Corp | Base isolation pile head member |
| JP2004211496A (en) * | 2003-01-08 | 2004-07-29 | Shimizu Corp | Pile head cap and pile head semi-rigid joint method making use of the pile head cap |
| JP2007332688A (en) * | 2006-06-16 | 2007-12-27 | Japan Pile Corp | Pile head structure |
| CN102535499A (en) * | 2012-02-13 | 2012-07-04 | 上海市城市建设设计研究总院 | Lift-off type seismic isolation and reduction pile foundation structure |
| CN106400828A (en) * | 2016-06-01 | 2017-02-15 | 中交第二航务工程局有限公司 | Steel pipe composite pile foundation applicable to deep water and coral reef geology |
| CN107119677A (en) * | 2017-06-08 | 2017-09-01 | 太原理工大学 | A kind of pile tube stake top fricting shearing type power consumption attachment means and its construction method |
| CN107964975A (en) * | 2017-10-27 | 2018-04-27 | 广东省交通规划设计研究院股份有限公司 | The PBL shear connectors connection structure and its construction method of steel pipe composite pile and cushion cap |
| CN215366774U (en) * | 2021-06-22 | 2021-12-31 | 天津市政工程设计研究总院有限公司 | Bridge shock-absorbing structure suitable for pile group foundation |
-
2021
- 2021-06-22 CN CN202110695731.2A patent/CN113356029A/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000120079A (en) * | 1998-10-16 | 2000-04-25 | Ohbayashi Corp | Base isolation structure of pile |
| JP2003027502A (en) * | 2001-07-13 | 2003-01-29 | Kubota Corp | Base isolation pile head member |
| JP2004211496A (en) * | 2003-01-08 | 2004-07-29 | Shimizu Corp | Pile head cap and pile head semi-rigid joint method making use of the pile head cap |
| JP2007332688A (en) * | 2006-06-16 | 2007-12-27 | Japan Pile Corp | Pile head structure |
| CN102535499A (en) * | 2012-02-13 | 2012-07-04 | 上海市城市建设设计研究总院 | Lift-off type seismic isolation and reduction pile foundation structure |
| CN106400828A (en) * | 2016-06-01 | 2017-02-15 | 中交第二航务工程局有限公司 | Steel pipe composite pile foundation applicable to deep water and coral reef geology |
| CN107119677A (en) * | 2017-06-08 | 2017-09-01 | 太原理工大学 | A kind of pile tube stake top fricting shearing type power consumption attachment means and its construction method |
| CN107964975A (en) * | 2017-10-27 | 2018-04-27 | 广东省交通规划设计研究院股份有限公司 | The PBL shear connectors connection structure and its construction method of steel pipe composite pile and cushion cap |
| CN215366774U (en) * | 2021-06-22 | 2021-12-31 | 天津市政工程设计研究总院有限公司 | Bridge shock-absorbing structure suitable for pile group foundation |
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Application publication date: 20210907 |
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