CN114753272A - Construction method of prestressed bearing platform for bridge pier repair - Google Patents
Construction method of prestressed bearing platform for bridge pier repair Download PDFInfo
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- CN114753272A CN114753272A CN202210482613.8A CN202210482613A CN114753272A CN 114753272 A CN114753272 A CN 114753272A CN 202210482613 A CN202210482613 A CN 202210482613A CN 114753272 A CN114753272 A CN 114753272A
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- bearing platform
- prestressed
- steel
- peripheral part
- pier
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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
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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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
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0046—Production methods using prestressing techniques
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
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- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to a construction method of a prestressed bearing platform for repairing a pier stud, which is characterized in that a bearing platform structure is designed into a peripheral part and a middle part, in the construction sequence, the peripheral part is poured firstly to serve as a temporary support foundation, a pier stud dismantling construction space is reserved in the middle of the peripheral part of the bearing platform, and the middle part of the bearing platform is poured after the pier stud and a capping beam are dismantled to form the finished bearing platform. The invention does not need to independently pour a support foundation, can save cost, and simultaneously reduces the later pouring construction amount of the bearing platform and can accelerate the emergency construction speed because a part of the bearing platform is finished in advance.
Description
Technical Field
The invention belongs to the technical field of bridge foundation construction, relates to repair construction of a lower structure of an operated bridge, and particularly relates to a construction method of a prestressed bearing platform for bridge pier repair.
Background
In the operation process of the bridge in the mountain area, the damage of lower structures such as piers and pile foundations is often caused by geological disasters or other reasons, and emergency repair construction is urgently needed. At present, when a bridge pier is repaired, whether an original pile foundation can be recycled or not can not be judged due to technical means limitation, normally, pile foundations are newly built on two sides of the original pile foundation, a temporary support is erected under a bridge to lift and support the bridge, then, the original pier stud and the cover beam are broken, a bearing platform is poured between the newly built pile foundations, and the pier stud and the cover beam are poured on the bearing platform again. Because the distance between newly-built pile foundations is increased, the pier stud is erected in the middle of the bearing platform, and the middle part of the bearing platform is easy to shear and damage in the operation process of the bridge and needs secondary repair; in addition, when a temporary support is erected, a support foundation needs to be poured separately, so that the construction period is prolonged, and the cost is increased.
Disclosure of Invention
The invention aims to solve the problems and provide a prestressed bearing platform construction method for bridge pier repair, which reduces the cost input, accelerates the construction speed and improves the shearing resistance of the bearing platform.
The technical scheme of the invention is as follows:
a construction method of a prestressed bearing platform for repairing a pier stud is characterized by comprising the following steps:
(1) newly building pile foundations on two sides of an original pile foundation of a bridge pier to be repaired in the transverse direction of the bridge pier, then firstly pouring a peripheral part of a cushion cap on the top of the newly built pile foundations and the periphery of the bridge pier, arranging a reserved space in the shape of a Chinese character kou in the middle of the peripheral part of the cushion cap, and positioning a pier stud to be repaired in the reserved space;
(2) erecting a temporary support at the top of the peripheral part of the bearing platform, arranging a jack on the support, jacking the bridge to be separated from the capping beam through the jack, and dismantling the original pier stud and the capping beam;
(3) and cleaning the inner side space of the peripheral part of the bearing platform, pouring the middle part of the bearing platform in the peripheral part of the bearing platform, and completely filling the interior of the peripheral part of the bearing platform by adopting micro-expansion concrete to form the complete bearing platform.
According to the invention, the bearing platform is poured twice, the peripheral part is poured firstly, the part is not only a part of the permanent structure of the bearing platform, but also can be used as a temporary support foundation, permanent combination is realized, the support foundation is not required to be poured independently, and the construction cost can be reduced; meanwhile, the peripheral part can avoid the original pier stud and does not influence the pier stud dismantling construction; pouring the middle part of the bearing platform after the pier stud is removed, and because part of the construction of the bearing platform is completed in the early stage, the later pouring amount is small, the construction speed of the bearing platform can be improved, the emergency construction period is shortened, and the requirement of emergency engineering on timeliness is met; the cushion cap adopts the prestressing force structure, and the ability of shearing is strong, can be competent as the needs on bearing layer under the complex environment, avoids the too big condition emergence that leads to the cushion cap to take place to cut the destruction of pile foundation interval.
Drawings
FIG. 1 is a construction flow diagram of the present invention;
FIG. 2 is a schematic plan view of the platform;
FIG. 3 is a schematic plan view of the peripheral portion of the platform;
FIG. 4 is a schematic cross-bridge elevational view of the platform;
FIG. 5 is a side view of a prestressed steel strand laying structure of a bearing platform;
FIG. 6 is a sectional view taken along line I-I in FIG. 5;
fig. 7 is a sectional view taken along line II-II in fig. 5.
Detailed Description
Fig. 1 shows a construction flow chart of the present invention, and the specific construction process is as follows:
as shown in fig. 2 and 3, pile foundations 1 are newly built on two sides of an original pile foundation of a bridge pier to be repaired in the transverse bridge direction, a bearing platform peripheral part 2 is poured at the top of the pile foundation and on the periphery of the bridge pier, the bearing platform peripheral part 2 is of a reversed-square structure, a square-shaped space is reserved in the middle of the bearing platform peripheral part, and a pier column 10 to be repaired is located in the reserved space. The reserved space is used for dismantling the pier stud construction, so that the size of the reserved space can meet the requirement of pier stud dismantling construction.
After the construction of the peripheral part of the bearing platform is completed, a temporary support is erected at the top of the peripheral part of the bearing platform, a jack is arranged on the support, the bridge is jacked to be separated from the capping beam through the jack, and the original pier column and the capping beam are removed. The construction method of this step is the same as that of the ordinary method.
After the pier stud and the capping beam are removed, the inner side space of the peripheral part of the bearing platform is cleaned, the middle part 4 of the bearing platform is poured in the peripheral part of the bearing platform, micro-expansive concrete is adopted in the middle part of the bearing platform, and the interior of the peripheral part of the bearing platform is completely filled to form the complete bearing platform.
As shown in fig. 4, 5, 6 and 7, the reinforcing steel bar frameworks 4 are arranged at the peripheral part and the middle part of the bearing platform. When the peripheral part of the bearing platform is poured, two layers of prestressed pipelines are arranged in the reinforcement cage along the transverse bridge direction while the reinforcement cage is bound, and the position of the steel bar is properly moved when the steel bar collides with the prestressed pipelines. Penetrating steel strands in the prestressed pipeline, then erecting a mould, and pouring concrete; when the concrete reaches 90% of the designed strength, the lower layer steel strand 5 is firstly tensioned, the grouting and the anchor sealing are carried out after the tensioning is finished, and then the upper layer steel strand 6 is tensioned, and the grouting and the anchor sealing are carried out.
The added prestress can improve the shearing resistance of the bearing platform and ensure the later bridge operation safety. In the concrete implementation, the prestressed steel strand adopts a high-strength low-relaxation prestressed concrete steel strand, the nominal diameter d is 15.2mm, the tensile standard strength fpk is 1860MPa, and the tension control stress is 1395 MPa. The concrete of the bearing platform reaches over 90 percent of standard strength, and the steel strand can be tensioned in the age period of not less than 7 days.
The steel strand tensioning adopts double control of tensioning control force and elongation, stress control is taken as a main point, the elongation is used for checking, and the error between the actually measured elongation and the calculated elongation is allowed to be minus 6% to plus 6%.
In order to avoid the collision of the upper and lower layers of prestressed steel strands, the upper and lower layers of prestressed steel strands are arranged in a staggered manner in the arrangement mode of the prestressed steel strands; the height of the upper prestressed steel strand 6 is gradually reduced from two ends to the middle to be consistent with that of the lower prestressed steel strand 5.
In order to further improve the shearing resistance of the bearing platform and avoid concrete cracking of the bearing platform, when the steel reinforcement framework at the peripheral part of the bearing platform is bound, a layer of horizontal steel reinforcement mesh 7 is laid at the bottom of the steel reinforcement framework, and a layer of vertical steel reinforcement mesh 8 is arranged at the inner side of the steel reinforcement framework.
As shown in fig. 6, when the reinforcement cage at the peripheral part of the bearing platform is bound, a certain length is reserved at the end part of the horizontal reinforcement facing the middle part of the bearing platform as a connecting reinforcement 9 for connecting with the reinforcement at the middle part of the bearing platform poured later. In order not to influence the installation of the template, the connecting ribs are temporarily bent and are close to the template; when the prestressed pipeline is installed, the prestressed pipeline penetrating through the middle part of the bearing platform is cut off at the inner wall of the peripheral part of the bearing platform, a pipeline through hole is reserved, and a steel strand does not penetrate through the prestressed pipeline.
Before the middle part of the bearing platform is poured, roughening the inner wall of the peripheral part of the bearing platform, and simultaneously cleaning and straightening the connecting ribs 9; when a steel bar framework at the middle part of a bearing platform is bound, a horizontal steel bar mesh is also arranged at the bottom of the steel bar framework at the middle part of the bearing platform, steel bars are connected with connecting bars on the inner wall of the peripheral part of the bearing platform, two layers of prestressed pipelines are arranged in the steel bar framework, each prestressed pipeline is respectively butted with a pipeline through hole reserved on the inner wall of the peripheral part of the bearing platform, the line type of the two layers of prestressed pipelines is consistent with the line type of the prestressed pipeline installed at the peripheral part of the bearing platform, steel stranded wires are penetrated in the butted prestressed pipelines, and then micro-expansion concrete is poured; when the concrete in the middle of the bearing platform reaches 90% of the design strength, firstly tensioning the lower layer steel strand 5, and grouting and sealing the anchor after tensioning is finished; and then building a pier column and a capping beam on the top of the middle part of the bearing platform, and finally tensioning the upper layer steel strand 6, grouting and sealing the anchor to complete the construction of the bearing platform.
Claims (6)
1. A construction method of a prestressed bearing platform for repairing a pier stud is characterized by comprising the following steps:
(1) newly building pile foundations on two sides of an original pile foundation of a bridge pier to be repaired in the transverse direction of the bridge pier, then firstly pouring a peripheral part of a cushion cap on the top of the newly built pile foundations and the periphery of the bridge pier, arranging a reserved space in the shape of a Chinese character kou in the middle of the peripheral part of the cushion cap, and positioning a pier stud to be repaired in the reserved space;
(2) Erecting a temporary support at the top of the peripheral part of the bearing platform, arranging a jack on the support, jacking the bridge to be separated from the capping beam through the jack, and dismantling the original pier stud and the capping beam;
(3) and cleaning the inner side space of the peripheral part of the bearing platform, pouring the middle part of the bearing platform in the peripheral part of the bearing platform, and completely filling the interior of the peripheral part of the bearing platform by adopting micro-expansive concrete to form the complete bearing platform.
2. The prestressed bearing platform construction method for pier column restoration according to claim 1, wherein: the periphery and the middle part of the bearing platform are provided with steel reinforcement frameworks, when the periphery of the bearing platform is poured, two layers of prestressed pipelines are arranged in the steel reinforcement frameworks along the transverse bridge direction while the steel reinforcement frameworks are bound, when steel reinforcements conflict with the prestressed pipelines, the positions of the steel reinforcements are properly moved, steel strands penetrate through the prestressed pipelines, and then concrete is poured by erecting a mold; when the concrete reaches 90% of the designed strength, the lower layer steel strand is firstly stretched, grouting and anchor sealing are carried out after the stretching is finished, then the upper layer steel strand is stretched, and grouting and anchor sealing are carried out.
3. The prestressed bearing platform construction method for pier column restoration according to claim 2, wherein: the upper layer of prestressed steel strands are gradually reduced from two ends to the middle height to be consistent with the height of the lower layer of prestressed steel strands, and the upper layer of prestressed steel strands and the lower layer of prestressed steel strands are arranged in a staggered mode.
4. The prestressed bearing platform construction method for pier column restoration according to claim 2, wherein: when the steel bar framework at the peripheral part of the bearing platform is bound, a layer of horizontal steel bar mesh is laid at the bottom of the steel bar framework, and a layer of vertical steel bar mesh is arranged at the inner side of the steel bar framework.
5. The prestressed cap construction method for pier column restoration according to claim 3 or 4, wherein: when a reinforcement framework at the peripheral part of the bearing platform is bound, reserving a certain length towards the end part of a horizontal reinforcement of a reserved space in the middle of the bearing platform to be used as a connecting rib, and temporarily bending the connecting rib and enabling the connecting rib to be close to the template; when the prestressed pipeline is installed, the prestressed pipeline penetrating through the middle part of the bearing platform is cut off at the inner wall of the peripheral part of the bearing platform, and the pipeline through hole is reserved without penetrating through the steel strand.
6. The prestressed bearing platform construction method for pier column restoration according to claim 5, wherein: before pouring the middle part of the bearing platform, chiseling on the inner wall of the peripheral part of the bearing platform, and simultaneously cleaning out connecting ribs and straightening; when a steel bar framework at the middle part of a bearing platform is bound, a horizontal steel bar mesh is also arranged at the bottom of the steel bar framework at the middle part of the bearing platform, steel bars are connected with connecting bars on the inner wall of the peripheral part of the bearing platform, two layers of prestressed pipelines are arranged in the steel bar framework at the middle part of the bearing platform, each prestressed pipeline is respectively butted with a pipeline through hole on the inner wall of the peripheral part of the bearing platform, the line type of the two layers of prestressed pipelines is consistent with the line type of the prestressed pipeline installed at the peripheral part of the bearing platform, steel stranded wires are penetrated in the butted prestressed pipelines, and then micro-expansion concrete is poured; when the concrete in the middle of the bearing platform reaches 90% of the design strength, firstly tensioning the lower layer steel strand, and grouting and sealing the anchor after tensioning is finished; and then newly building a pier column and a capping beam at the top of the middle part of the bearing platform, finally tensioning the upper layer steel strand, grouting and sealing the anchor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210482613.8A CN114753272A (en) | 2022-05-05 | 2022-05-05 | Construction method of prestressed bearing platform for bridge pier repair |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210482613.8A CN114753272A (en) | 2022-05-05 | 2022-05-05 | Construction method of prestressed bearing platform for bridge pier repair |
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| CN114753272A true CN114753272A (en) | 2022-07-15 |
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| CN202210482613.8A Pending CN114753272A (en) | 2022-05-05 | 2022-05-05 | Construction method of prestressed bearing platform for bridge pier repair |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08296209A (en) * | 1995-04-26 | 1996-11-12 | Mitsubishi Heavy Ind Ltd | Method for reinforcing foundation part of elevated bridge |
| CN105155431A (en) * | 2015-10-22 | 2015-12-16 | 河南省公路工程局集团有限公司 | Rapid repair method for three-stand-column structure bridge with damaged lateral stand columns and undamaged beam and slab structure |
| CN105464002A (en) * | 2014-08-18 | 2016-04-06 | 宁波市江北交通工程有限公司 | Reinforcing construction method of reinforcing steel concrete thin-walled abutment |
| JP2016160686A (en) * | 2015-03-03 | 2016-09-05 | 三井造船鉄構エンジニアリング株式会社 | Bridge footing replacement method |
| CN106065577A (en) * | 2016-08-08 | 2016-11-02 | 福州轨道交通设计院有限公司 | The structure of a kind of new pile foundation underpinning and method |
| CN108708298A (en) * | 2018-05-25 | 2018-10-26 | 上海应用技术大学 | A kind of bridge pier rapid constructing method of old bridge reparation |
| CN109372011A (en) * | 2018-12-03 | 2019-02-22 | 中铁三局集团有限公司 | Large-volume prestressed beam underpinning structure and the method for carrying out pile foundation underpinning with the structure |
| CN209307882U (en) * | 2018-09-30 | 2019-08-27 | 西北民族大学 | It is a kind of for improving the cushion cap device on pile foundation reinforcement basis |
| CN209760290U (en) * | 2019-02-23 | 2019-12-10 | 重庆三峡学院 | Full-covering type pile foundation underpinning node |
| JP6650981B1 (en) * | 2018-09-25 | 2020-02-19 | 第一建設工業株式会社 | Installation method of temporary closing structure used for pier repair and reinforcement work |
| CN110924318A (en) * | 2019-12-24 | 2020-03-27 | 中铁一局集团有限公司 | Construction structure and method for T-frame underpinning original abutment pile foundation reinforcing rigid frame bridge |
| CN113668368A (en) * | 2021-09-09 | 2021-11-19 | 石家庄铁道大学 | Plastic hinge area enlarged section assembled type swing pier and construction method thereof |
-
2022
- 2022-05-05 CN CN202210482613.8A patent/CN114753272A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08296209A (en) * | 1995-04-26 | 1996-11-12 | Mitsubishi Heavy Ind Ltd | Method for reinforcing foundation part of elevated bridge |
| CN105464002A (en) * | 2014-08-18 | 2016-04-06 | 宁波市江北交通工程有限公司 | Reinforcing construction method of reinforcing steel concrete thin-walled abutment |
| JP2016160686A (en) * | 2015-03-03 | 2016-09-05 | 三井造船鉄構エンジニアリング株式会社 | Bridge footing replacement method |
| CN105155431A (en) * | 2015-10-22 | 2015-12-16 | 河南省公路工程局集团有限公司 | Rapid repair method for three-stand-column structure bridge with damaged lateral stand columns and undamaged beam and slab structure |
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| CN108708298A (en) * | 2018-05-25 | 2018-10-26 | 上海应用技术大学 | A kind of bridge pier rapid constructing method of old bridge reparation |
| JP6650981B1 (en) * | 2018-09-25 | 2020-02-19 | 第一建設工業株式会社 | Installation method of temporary closing structure used for pier repair and reinforcement work |
| CN209307882U (en) * | 2018-09-30 | 2019-08-27 | 西北民族大学 | It is a kind of for improving the cushion cap device on pile foundation reinforcement basis |
| CN109372011A (en) * | 2018-12-03 | 2019-02-22 | 中铁三局集团有限公司 | Large-volume prestressed beam underpinning structure and the method for carrying out pile foundation underpinning with the structure |
| CN209760290U (en) * | 2019-02-23 | 2019-12-10 | 重庆三峡学院 | Full-covering type pile foundation underpinning node |
| CN110924318A (en) * | 2019-12-24 | 2020-03-27 | 中铁一局集团有限公司 | Construction structure and method for T-frame underpinning original abutment pile foundation reinforcing rigid frame bridge |
| CN113668368A (en) * | 2021-09-09 | 2021-11-19 | 石家庄铁道大学 | Plastic hinge area enlarged section assembled type swing pier and construction method thereof |
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