CN-116732865-B - Steel sleeve assembled rail transit pier adopting hybrid connection and construction method thereof

CN116732865BCN 116732865 BCN116732865 BCN 116732865BCN-116732865-B

Abstract

The invention discloses a steel sleeve assembled rail transit pier adopting hybrid connection and a construction method thereof, wherein the pier structure is formed by assembling a bearing platform, a pre-buried corrugated pipe, high-strength bolts, steel sleeves, a flange connecting plate, reinforced concrete pier body sections, prestressed tendons and energy-consuming steel bars, the bearing platform, the outer-packed steel sleeves and the pier body sections are prefabricated in a factory, transported to the site, and sequentially assembled in series by adopting hybrid connection modes such as grouting corrugated pipe connection, high-strength bolt flange connection, post-tensioned prestressed connection and the like, the flange connection is arranged at the joint positions among different sections of the pier, the energy-consuming steel bars and the pier are cooperatively deformed, the opening and closing of the joint positions of the pier bottom are controlled, the energy-consuming and damping effects are exerted, the different damping requirements of the pier are met, the steel sleeves play a role of buffering and damping, and the collision damage of concrete at the joint positions is reduced.

Inventors

LI HAO
MENG XIN
WEI YING
JI XINLIN
HUANG JIANJING
LI JING

Assignees

北京城建设计发展集团股份有限公司

Dates

Publication Date: 20260508
Application Date: 20230418

Claims (8)

1. The utility model provides an adopt steel bushing assembled track traffic pier of hybrid connection, includes cushion cap and a plurality of pier body sections of supporting on the cushion cap, its characterized in that: The pier body sections comprise variable cross-section pier body sections, at least one linear pier body section and a plastic hinge pier body section which are sequentially connected from top to bottom to form a complete pier body, a plurality of supporting cushion stones are arranged at the top end of the top of the pier body, the bottom of the pier body is connected to a bearing platform, the pier body sections are connected by adopting a high-strength bolt flange structure, the bottom of the pier body is connected with the bearing platform by adopting a grouting corrugated pipe and energy-consumption steel bar flange structure, and the pier body is integrally connected with the bearing platform by adopting post-tensioning prestress, so that the self-resetting capability of the pier is provided; Each pier body section is externally wrapped with a steel sleeve, and an overhanging flange plate is arranged at the connecting position of the steel sleeve; Each pier body section and the bearing platform are provided with a prestress reserved pore canal for the penetration of the prestress rib; The plastic hinge pier body section at the bottom of the pier body is connected with a bearing platform, a plurality of energy-consuming steel bars are arranged at the periphery of a flange plate of a steel sleeve corresponding to the plastic hinge pier body section, the plurality of energy-consuming steel bars penetrate through the flange plate and are fixed by adopting a fastening nut assembly, a plurality of bearing platform embedded metal corrugated pipes are embedded in the inner sides of the energy-consuming steel bars by the bearing platform, and a plurality of anchor steel bars which can extend into the bearing platform embedded metal corrugated pipes are arranged at the bottoms of the plastic hinge pier body section corresponding to the bearing platform embedded metal corrugated pipes; The connecting end of the steel sleeve of the pier body section is provided with a plurality of grouting guide pipes, one end of each grouting guide pipe is flush with the side face of the steel sleeve, the other end of each grouting guide pipe is flush with the surface of the concrete inside the prefabricated pier body section, the grouting guide pipes are in L-shaped transition, the middle of each grouting guide pipe is in arc-shaped transition, the grouting guide pipes above the connecting joint of the sections extend out of the side face of the steel sleeve to form grouting holes, the grouting guide pipes below the connecting joint of the pier body section extend out of the side face of the steel sleeve to form grouting holes, after the flange connection is completed, the connecting joint between the pier body sections is grouted, specifically, the outlet of the grouting machine is butted with the grouting holes, micro-expansion cement mortar grouting material is filled into grouting holes formed by the grouting guide pipes at the top of the lower pier body section, after a reserved space is filled in the connecting joint of the section, redundant micro-expansion cement mortar grouting material is filled into grouting holes formed by the pre-buried grouting guide pipes at the bottom of the upper pier body section, the grouting holes flow out of the grouting holes, pressure maintaining and grouting operation of the section connecting joint of the sections are completed, and the grouting operation of the sections is completely attached between the two connecting joint positions of the pier body section is guaranteed, so that the force transmission uniformity of the pier body is guaranteed.
2. The steel sleeve fabricated rail transit pier adopting hybrid connection according to claim 1, wherein a high-strength mortar cushion layer is arranged between the pier body and the bearing platform.
3. The steel bushing assembled rail transit pier adopting hybrid connection according to claim 1, wherein the flanges of the steel bushing between the pier body sections are connected by high-strength bolt connecting components, and a plurality of connecting holes for through connection of the high-strength bolt connecting components are arranged at intervals on the periphery of the two connected flanges.
4. The steel bushing assembled rail transit pier adopting hybrid connection according to claim 1, wherein the middle part of the pier body section is pre-embedded with a pier body pre-embedded metal corrugated pipe, so that a pre-stress reserved pore canal in the middle part of the pier body section is formed after prefabrication.
5. A construction method of the steel bushing assembly type rail transit pier adopting the hybrid connection as claimed in any one of claims 1 to 4, characterized by comprising the following construction steps: Step 1, completing factory prefabrication work of a bearing platform and a plurality of pier body sections; Step 2, assembling the pier body section at the lowest end of the pier body and the bearing platform, firstly carrying out matched assembly, paving a slurry blocking template around the splicing seam, then leveling an adjusting cushion block arranged at the splicing seam, paving a high-strength mortar cushion layer, then hoisting the bottom pier body section, connecting the bottom pier body section with the bearing platform through a grouting metal corrugated pipe, anchoring one end of a prestressed rib at the bottom of the bearing platform, penetrating the bearing platform and the bottom pier body section through a reserved pore canal at the other end of the prestressed rib, and connecting the two sections in series to finish the assembly of the bottom pier body and the bearing platform; Step 3, assembling the next pier body section, hoisting the next pier body section, slowly lowering the next pier body section after hoisting the next pier body section to a specified height, measuring, controlling and adjusting the verticality and elevation of the next pier body section to a specified position, installing a connecting bolt assembly after meeting the precision requirement, pouring a concrete top surface and a flange plate top surface in the next pier body section to keep a distance of 20mm when the pier body section is prefabricated, respectively reserving grouting holes and grout outlet holes at the top and bottom of the pier body section, respectively arranging corresponding grouting holes and grout outlet holes at the top side surface and the bottom side surface of the pier body section, grouting a connecting joint between the pier body sections after the flange plate connection is completed, ensuring that two connecting surfaces are completely attached at the joint position of the pier body section, further ensuring the uniformity of pier body force transmission, connecting a second pier body section with the assembled parts in series through the reserved holes along the center of the pier body section to complete the assembly of the second pier body section, and sequentially installing the rest straight line section pier body section and the section variable section pier body section according to the assembly flow; step 4, after the assembly is completed, the anchoring grooves reserved on the top surfaces of the sections of the variable cross-section pier body are anchored and tensioned by an anchor to form post-tensioned prestressed connection, and then the anchoring grooves are poured and filled by cement mortar to complete the field assembly work of the pier; and 5, finishing the energy-consumption steel bar flange connection between the bottom of the pier body and the bearing platform, drilling and washing the bearing platform at the flange connection hole of the section of the pier body at the bottom, injecting glue into the hole to perform bar planting operation, implanting energy-consumption steel bars, installing a nut connection assembly at the top end of the energy-consumption steel bars and fastening the nut connection assembly to a specified moment, and finishing the energy-consumption steel bar flange connection between the bottom of the pier body and the bearing platform.
6. The construction method of the steel bushing assembly type rail transit pier adopting the mixed connection according to claim 5, wherein the prefabrication of each pier body section in the step 1 comprises the following substeps: step 1.1, blanking and processing reinforcing steel bars and steel plates; Step 1.2, welding a steel sleeve of the pier body section, welding the machined and formed steel sleeve into a whole, and welding a flange plate at the connecting end of the steel sleeve, wherein only the lower end of the steel sleeve of the pier body with the variable section needs to be welded with the flange plate, and the other ends are welded; Step 1.3, binding a reinforcement cage and arranging a prestressed pipeline; step 1.4, supporting the pier body directly by adopting a corresponding segment steel sleeve as a steel template, after the supporting of the pier body is completed, adjusting the perpendicularity of the pier again, supporting the steel template at the periphery by using a stiffening steel bracket, and ensuring that the pier body template of the pier is not deformed, deflected or rotated in the pouring maintenance process and is always perpendicular to a horizontal plane; step 1.5, hoisting the steel reinforcement framework, and hoisting the bound steel reinforcement framework into a steel sleeve template; and 1.6, concrete pouring and component curing.
7. The construction method of the steel sleeve fabricated rail transit pier adopting the hybrid connection according to claim 5, wherein the prefabrication of the bearing platform in the step1 comprises the following substeps: Step 1.1, blanking and processing reinforcing steel bars; Step 1.2, binding a reinforcement cage and arranging a prestressed pipeline; step 1.3, supporting a die, wherein the size of a bearing platform is square, the die plate is manufactured by adopting a wood plate, and a pull screw is used for reinforcing after the die plate is installed in place; hoisting the reinforcement cage, and hoisting the bound reinforcement cage into a supported template; Step 1.5, concrete pouring and component curing; and 1.6, removing the die and maintaining the component.
8. The construction method of the steel sleeve fabricated rail transit pier adopting hybrid connection according to claim 5, wherein step 3 comprises the steps of assembling the next pier body segment, firstly plugging the periphery of a prestressed duct at the concrete top surface of the last pier body segment by using an expansion sealing adhesive tape, preventing slurry from penetrating into the prestressed duct during subsequent grouting, cleaning the connecting surface layers of the upper pier body segment and the lower pier body segment, measuring the levelness of the flange plate at the top of the last pier body segment, leveling the gasket, hoisting the next pier body segment to a designated position, measuring, controlling and adjusting the verticality and elevation of the next pier body segment, installing a connecting bolt assembly after meeting the precision requirement, fastening all high-strength connecting bolts to a designated moment according to the design standard, dismantling a pier body segment hoist, and removing a guiding chute.

Description

Steel sleeve assembled rail transit pier adopting hybrid connection and construction method thereof Technical Field The invention relates to the technical field of civil engineering, relates to an assembled pier damping technology, and in particular relates to a steel sleeve assembled rail transit pier adopting hybrid connection and a construction method thereof. Background The prefabricated assembly bridge pier has the advantages of reliable quality, standardized production, convenient construction, environmental pollution, low energy consumption and the like, but has the problems of easy expansion of segment assembly joints under the action of horizontal force, poor integrity and deformability, and weaker earthquake resistance than an integral cast-in-situ structure, so that the prefabricated assembly bridge pier can only be generally applied to low-earthquake regions, and is limited in medium-and high-earthquake regions. The segment spliced pier is formed by assembling a plurality of pier segments, the segments are connected together through tensioning prestressed tendons, longitudinal stress steel bars are arranged inside each pier segment, and the longitudinal stress steel bars are discontinuous at joint positions of the pier segments, so that the joint positions are weak stress positions of the segment spliced pier. Compared with cast-in-situ reinforced concrete piers, the research results show that the segment spliced piers have small residual displacement and better self-resetting capability, but the hysteresis curve is obviously pinched, the energy consumption capability is weaker, and the horizontal bearing capacity of the pier top is weaker than that of the same type of cast-in-situ piers, so that the popularization and application of the type of piers in high-intensity earthquake areas are limited. In order to further improve the earthquake-resistant performance of the segment spliced pier and improve the earthquake-resistant safety of the segment spliced pier applied to high-intensity areas, scholars at home and abroad have conducted intensive researches on the damping measures of the segment spliced pier. The equivalent cast-in-situ system has better integrity and energy consumption capability, and the non-equivalent cast-in-situ system has unique self-resetting capability, and the 2 assembly type bridge pier system deformation mechanisms are combined to form a mixed system. The hybrid system combining multiple connection forms can simultaneously have better energy consumption capability and self-resetting capability. And the earthquake resistance of the assembled bridge pier is improved. However, the mixed system has the respective problems of 2 systems, such as difficult maintenance of plastic hinges, and the adoption of prestressed tendons can improve the operation difficulty in construction, maintenance and the like. In addition, under the effect of strong earthquake, the segment spliced pier can perform great swing motion, the position collision among different segments is severe, the concrete at the joint is obviously plastically damaged, and the earthquake-resistant safety of the pier is seriously affected. Therefore, the designer of the invention has the defects that the experience and the achievement of relevant industries are integrated for a long time through intensive research and design, and the steel sleeve assembly type rail transit pier adopting the hybrid connection and the construction method thereof are researched and designed to overcome the defects. Disclosure of Invention The invention aims to provide a steel sleeve assembled rail transit pier adopting hybrid connection and a construction method thereof, wherein prefabricated members of the pier are connected in various connection modes, pier body sections are connected by adopting high-strength bolts and flanges, pier bottoms and bearing platforms are connected by adopting grouting corrugated pipes and energy-consuming steel bars and flanges, the pier bodies and the bearing platforms are integrally connected by adopting post-tensioning prestress, the self-resetting capability of the pier is provided, the defects of the prior art are effectively overcome, and the pier has important engineering practical application value and significance for popularization and application of the pier in high-intensity earthquake areas. In order to achieve the above purpose, the invention discloses a steel sleeve assembled rail transit pier adopting hybrid connection, which comprises a bearing platform and a plurality of pier body sections supported on the bearing platform, and is characterized in that: The pier body sections comprise variable cross-section pier body sections, at least one linear pier body section and a plastic hinge pier body section which are sequentially connected from top to bottom to form a complete pier body, a plurality of supporting cushion stones are arranged at the top end of the top of the pier body, the bottom