CN-119145322-B - Repairing construction method for pier body inclination caused by landslide

Abstract

The invention discloses a repairing construction method for a pier body tilting caused by landslide, which belongs to the technical field of bridge repairing and comprises the following steps of installing a lower steel pipe column; micro-expansion concrete pouring, middle upright post and steel platform installation, upper support structure and box girder installation. According to the invention, the support structure for dismantling the inclined pier column is directly used for replacing the original inclined pier column, and a new pier column does not need to be poured again, so that the repairing time is greatly shortened, the expenditure cost is saved, the threat of natural disasters such as landslide on the bridge is effectively solved, and the bridge is suitable for wide popularization.

Inventors

• Xuan Xinpeng
• ZHANG HUA
• LIU QIANG
• ZHANG ZHONGWEN
• ZHAO JINPENG
• XIANG LIMING
• ZOU SONGBAI
• WANG XIANGGUO
• WU WENHUI
• LI CHENG
• ZHAO BIN
• YU WEI
• BI ZHANGLONG
• CHEN QINGYUN
• BU DONGPING
• SHEN JIE
• ZHANG HUAMING
• HE YONGBIN

Assignees

• 中铁一局集团有限公司
• 中铁一局集团第八工程有限公司
• 中铁一局集团桥梁工程有限公司

Dates

Publication Date

20260505

Application Date

20241101

Claims (7)

1. 1. The repairing construction method for the pier body inclination caused by landslide is characterized by comprising the following steps of: The method comprises the steps of S1, installing lower steel pipe columns on a pile foundation of a bearing platform, arranging the lower steel pipe columns on two sides of an inclined pier column, immediately installing a transverse horizontal support and pouring micro-expansion concrete after the installation of the lower steel pipe columns on one side is completed, welding a plurality of sections of steel pipes with the diameter of 1400mm and the wall thickness of 20mm to form the lower steel pipe columns, leveling and welding each lower steel pipe column on the ground to reduce the deviation generated when welding vertical connection points of the steel pipes, and welding a cross limiting plate at the position of an upper pipe orifice in advance when leveling and welding acceptance limit is found on the ground, so that the pipe orifices are smoothly butted when vertical butt joint is convenient, and each row of steel pipes on site are not arranged on the same horizontal line in pairs, thereby meeting the requirement of staggered arrangement of welding ports; S2, establishing a temporary steel pipe column foundation at the position of one side of each of two rows of lower steel pipe columns and extending out of the bridge, and installing the temporary steel pipe column when the strength of concrete in the foundation reaches 85%, wherein the size of the temporary steel pipe column foundation is 2.4X2.6X0.6 m independent foundation, the bottom of the concrete foundation is 0.4 m, filling the rubble, paving a phi 16@200 reinforcing steel mesh sheet after backfilling and leveling the rubble, using split heads as the support of the reinforcing steel mesh sheet, simultaneously, embedding a temporary column bottom steel plate with the thickness of 20mm in the foundation, using phi 25 reinforcing steel bars for anchor pulling at the bottom of the foundation, and using plug seam welding for connecting the steel plate and the reinforcing steel bars; S3, installing a middle steel pipe column at the upper pipe orifice of the lower steel pipe column, immediately installing a transverse horizontal support and pouring micro-expansion concrete after the completion, and building a steel platform at the top end of the middle steel pipe column after the micro-expansion concrete reaches the design strength; s4, after the steel platform is built, hanging the temporary box girders on the front side and the rear side of the steel platform due to the limitation of the upper space, then jacking the temporary box girders by using a jack, and then installing a top supporting structure between the steel platform and the temporary box girders; S5, after the installation of the top supporting structure is completed, installing a support base plate on the temporary box girder, carrying out jacking operation on the bridge, separating a support and a base stone of the capping beam from the bridge, and then carrying out dismantling operation of the capping beam and the inclined pier column; S6, after the dismantling is completed, installing a longitudinal horizontal support, and then carrying out secondary jacking on the temporary box girder so as to install a permanent box girder and a support base plate, and welding diagonal braces between the bottom end of the permanent box girder and the steel pipe upright post; S7, after the diagonal bracing is welded, lowering the temporary box girder and dismantling the temporary box girder to finish the support conversion of the temporary box girder and the permanent box girder; and S8, finally, coating all the steel structures, and performing rust prevention measures to finish construction.
2. 2. The repairing construction method for the pier body inclination caused by landslide according to claim 1, wherein the steel platform in the step S3 is supported by bracket welded on the steel pipe upright post to serve as a transverse supporting point, and extends to the temporary steel pipe upright post to serve as a platform for transferring waste slag, so that the crane is convenient to work.
3. 3. The repairing construction method for the pier body inclination caused by landslide according to claim 2 is characterized in that the steel platform is longitudinally erected by using I56 double-spliced steel as main beams, each main beam is arranged left and right according to the positions of bracket supports and concrete columns, but a distance of 30cm is required to be arranged between each main beam and each concrete column, the secondary beams are transversely erected by using I18 double-spliced steel, the erection distance is arranged according to the distance of 30cm, the distance between each secondary beam and each concrete column is 30cm, all main beams and the secondary beams are fixedly connected in a welding mode, after the fixing positions, 6mm steel plates are paved on the upper parts of the built brackets, the steel plates and the secondary beams are welded and fixed, rails are fixed on the tops of the steel plates, rail cars are arranged on the rails in a sliding mode, the thickness of the steel plates are paved according to stress positions, and two layers of 6mm steel plates are paved at the rail installation positions.
4. 4. The repairing construction method for the pier body inclination caused by landslide according to claim 3, wherein the steel guardrail is welded on the I56 double-spliced girder at the edge position of the steel platform.
5. 5. The repairing construction method for the pier body inclination caused by landslide according to claim 1 is characterized in that the top supporting structure in the S4 comprises an upper steel pipe column and a column top steel plate, the top supporting structure is used for firstly propping the temporary box girder to be 5cm higher than the column top steel plate before installation, then welding the upper steel pipe column, completely welding the upper steel pipe column, then falling the temporary box girder onto the column top steel plate, adjusting the positions of two sides, and finely adjusting the positions of the temporary box girders on two sides by using code plates.
6. 6. The repairing construction method for the pier body inclination caused by landslide according to claim 1, wherein in the S5, in order to safely remove and facilitate operation of the inclined pier column at the lower part of the capping beam, a temporary steel platform is arranged at a position 3m below a built steel platform on site and used as a temporary space for operators and construction equipment to place, and the space of the steel platform only ensures a passage for the operators to walk and the position for temporarily placing equipment when the inclined pier column is removed.
7. 7. The repairing construction method for the pier body inclination caused by landslide according to claim 1, wherein in the step S7, when temporary box girder and permanent box girder support conversion is carried out, the integral structure of the bridge is required to monitor stress change, and before lifting is started, the elevation of the position of a related bridge support and the integral stress data of the bridge are required to be obtained from an original design unit, and meanwhile, a unit specially used for measuring and monitoring is arranged on site, so that the monitoring work of the integral stress of the bridge pier column and the bridge in the construction process is carried out.

Description

Repairing construction method for pier body inclination caused by landslide Technical Field The invention belongs to the technical field of bridge repair, and particularly relates to a repair construction method for a pier body tilting caused by landslide. Background Due to the influence of geological disasters such as earthquakes and landslides, the pier column of the bridge sometimes has an offset condition, which greatly influences the traffic of vehicles and the safety of the bridge, but no systematic pier column repairing method exists at present, so that the bridge is often repaired by spending a great amount of manpower and material resources, and the repairing efficiency is low. Therefore, how to provide a systematic method capable of quickly repairing an inclined pier stud and saving cost is a technical problem that needs to be solved by those skilled in the art. Disclosure of Invention The invention aims to provide a repairing construction method for tilting a pier body caused by landslide, which solves the defects in the prior art. In order to achieve the aim of the invention, the invention adopts the following technical scheme: A repairing construction method for the pier body inclination caused by landslide comprises the following steps: s1, installing lower steel pipe columns on a pile foundation of a bearing platform, arranging and distributing the lower steel pipe columns on two sides of an inclined pier column, and immediately installing a transverse horizontal support and pouring micro-expansion concrete after the installation of the lower steel pipe columns on one side is completed; s2, establishing a temporary steel pipe column foundation at the position of one side of each of the two rows of lower steel pipe columns extending out of the bridge, and installing the temporary steel pipe columns when the strength of concrete in the foundation reaches 85%; S3, installing a middle steel pipe column at the upper pipe orifice of the lower steel pipe column, immediately installing a transverse horizontal support and pouring micro-expansion concrete after the completion, and building a steel platform at the top end of the middle steel pipe column after the micro-expansion concrete reaches the design strength; s4, after the steel platform is built, hanging the temporary box girders on the front side and the rear side of the steel platform due to the limitation of the upper space, then jacking the temporary box girders by using a jack, and then installing a top supporting structure between the steel platform and the temporary box girders; s5, after the top supporting structure is installed, installing a support base plate on the temporary box girder, carrying out jacking operation on the bridge, separating a support and a filler stone of the capping girder from the bridge, and then carrying out dismantling operation of the capping girder and the inclined pier column; S6, after the dismantling is completed, installing a longitudinal horizontal support, and then carrying out secondary jacking on the temporary box girder so as to install a permanent box girder and a support base plate, and welding diagonal braces between the bottom end of the permanent box girder and the steel pipe upright post; S7, after the diagonal bracing is welded, lowering the temporary box girder and dismantling the temporary box girder to finish the support conversion of the temporary box girder and the middle cross girder; and S8, finally, coating all the steel structures, and performing rust prevention measures to finish construction. Preferably, the lower steel pipe stand column in S1 is formed by welding a plurality of sections of steel pipes with the diameter of 1400mm and the wall thickness of 20mm, in order to reduce deviation generated when welding vertical connection points of the steel pipes, each lower steel pipe stand column is preferably leveled and welded on the ground, when the acceptance limit of leveling and welding is found on the ground, 4 cross limiting plates are welded at the upper pipe orifice position in advance, the pipe orifices are conveniently and smoothly butted when vertical butt joint is carried out, each row of on-site steel pipes are not in the same horizontal line in pairs, and the requirement of staggered arrangement of welding ports is met. Preferably, in order to prevent secondary deviation of the inclined pier stud in the dismantling process, limiting section steel of H400 multiplied by 400 is welded on the steel pipe column, the inclined pier stud is limited, a 10mm gap is reserved between the limiting section steel and the inclined pier stud, and disturbance to the steel pipe column during cutting of the inclined pier stud is reduced. Preferably, the foundation size of the temporary steel pipe column in the S2 is 2.4X2.6X0.6 m independent foundation, a range of 0.4 m below the concrete foundation is changed and filled with rubble, after the rubble is backfilled and leveled, reinforcing s