CN-121976457-A - FRP-steel tube recycled concrete hollow pier column-bent cap assembly type node structure and construction method

CN121976457ACN 121976457 ACN121976457 ACN 121976457ACN-121976457-A

Abstract

The invention relates to an FRP-steel tube recycled concrete hollow pier column-bent cap assembly type node structure and a construction method, and belongs to the technical field of bridge engineering. The prefabricated regenerated concrete hollow pier column and the prefabricated capping beam are combined and connected through a stretching prestressed anchor rod and a UHPC grouting corrugated pipe, so that the connection reliability and the anti-seismic safety of the fabricated node are ensured. The prefabricated regenerated concrete hollow pier column consists of an FRP outer pipe, a steel inner pipe, pier column longitudinal high-strength steel bars, regenerated concrete and shear nails, the prefabricated capping beam consists of a reserved metal corrugated pipe, a reserved metal pipeline, capping beam longitudinal bars and capping beam stirrups, and the prefabricated regenerated concrete hollow pier column has the advantages of light weight, corrosion resistance, environmental friendliness, simple construction process, good economic benefit and the like while meeting the seismic performance of a connecting node.

Inventors

XU LI
ZHOU MOHAN
ZHANG GUANGDA
WU SHANGMING
LAN XINGRONG
YAN LIBO
HAO CHAOWEI

Assignees

福州大学

Dates

Publication Date: 20260505
Application Date: 20260402

Claims (10)

1. The FRP-steel tube recycled concrete hollow pier column-bent cap assembly type node structure consists of a prefabricated recycled concrete hollow pier column (1) and an upper prefabricated bent cap (7), and is characterized in that: the prefabricated regenerated concrete hollow pier column (1) and the prefabricated capping beam (7) are connected into a whole through a prestressed anchor rod (12) in a reserved metal pipeline (13) and a high-strength concrete UHPC (10) in a reserved metal corrugated pipe (11); the prefabricated regenerated concrete hollow pier column (1) comprises a pier column FRP outer tube (2), a pier column steel inner tube (3), pier column longitudinal high-strength steel bars (4), regenerated concrete (5) and shear nails (6), wherein the prefabricated capping beam (7) comprises a reserved metal corrugated tube (11) and a reserved metal pipeline (13), and high-strength concrete UHPC (10) is poured in the reserved metal corrugated tube (11); The pier column longitudinal high-strength steel bars (4) are pre-buried around the inside of the recycled concrete (5) between the pier column steel inner tube (3) and the pier column FRP outer tube (2), and the part, extending out of the prefabricated recycled concrete hollow pier column (1), of the upper part of the pier column longitudinal high-strength steel bars is inserted into the reserved metal corrugated tube (11); connecting steel plates (100) extend out of two sides of the top of the pier column steel inner pipe (3) respectively, the inner ends of the connecting steel plates (100) are welded with the pier column steel inner pipe (3), and the top ends of the pier column FRP outer pipes (2) are welded and fixed with the lower surfaces of the connecting steel plates (100); the connecting steel plate (100) is respectively reserved with a high-strength steel bar channel and a pre-stress anchor rod channel which are penetrated by the pier column longitudinal high-strength steel bar (4) and the pre-stress anchor rod (12), and the pier column longitudinal high-strength steel bar (4) extends out and is fixed on the high-strength steel bar channel; The regenerated concrete (5) is poured between the pier column FRP outer pipe (2) and the pier column steel inner pipe (3), and a plastic hinge area corresponding to the position of the shear pin (6) in the pier column steel inner pipe (3); The prestressed anchor rod (12) penetrates through the prestressed anchor rod pore canal and the reserved metal pipeline (13), and the upper end and the lower end of the prestressed anchor rod (12) are tensioned and fixed so as to connect the prefabricated regenerated concrete hollow pier column (1) with the prefabricated capping beam (7).
2. The FRP-steel tube recycled concrete hollow pier column-bent cap assembly type node structure disclosed by claim 1 is characterized in that the reserved metal corrugated pipe (11) is pre-embedded in the prefabricated bent cap (7) and has the height consistent with that of the prefabricated bent cap (7), and the prefabricated bent cap (7) further comprises a bent cap longitudinal rib (9) and a bent cap stirrup (8).
3. The FRP-steel tube recycled concrete hollow pier column-bent cap assembly type node structure is characterized in that the high-strength steel bar pore canal is arranged on the inner pier column steel pipe (3) and the outer pier column FRP pipe (2), and the prestressed anchor rod pore canal is arranged on the outer FRP pipe (2).
4. The FRP-steel tube recycled concrete hollow pier column-bent cap assembly type node structure according to claim 1, wherein the anchoring length of the pier body longitudinal high-strength steel bar (4) inserted into the reserved metal corrugated pipe (11) is not less than 10 times the diameter of the pier body longitudinal high-strength steel bar (4).
5. The FRP-steel tube recycled concrete hollow pier column-bent cap assembly node structure of claim 1, wherein the compressive strength of the high-strength concrete UHPC (10) is not lower than 120MPa, and the tensile strength is not lower than 10MPa.
6. The FRP-steel tube recycled concrete hollow pier column-bent cap assembly type node structure according to claim 1, wherein the size and the number of the shear nails (6) are determined according to actual structural requirements.
7. The FRP-steel tube recycled concrete hollow pier column-bent cap assembly type node structure of claim 1, wherein the diameter of the reserved metal corrugated pipe (11) is not smaller than 2-3 times of the diameter of the pier body longitudinal high-strength steel bar (4), and the thickness is not smaller than 2mm.
8. The FRP-steel tube recycled concrete hollow pier column-bent cap assembly type node structure according to claim 1, wherein the wall thickness of the pier column steel inner tube (3) is not smaller than 3mm, and the wall thickness of the pier column FRP outer tube (2) is not smaller than 2mm.
9. The FRP-steel tube recycled concrete hollow pier column-bent cap fabricated node structure of claim 1, wherein the inner diameter of the reserved metal pipe (13) is not smaller than 1.2 times of the diameter of the prestressed anchor rod (12), and the wall thickness is not smaller than 1/50 of the inner diameter and not smaller than 2mm.
10. A construction method of the FRP-steel pipe recycled concrete hollow pier column-bent cap assembly type node structure according to any one of claims 1 to 9, comprising the steps of: S1, prefabricating an pier column FRP outer pipe (2) and an pier column steel inner pipe (3) in a factory, welding shear nails (6) on the inner surface of the pier column steel inner pipe (3), arranging pier body longitudinal high-strength steel bars (4) between the pier column FRP outer pipe (2) and the pier column steel inner pipe (3), extending out high-strength steel bar pore canals on a connecting steel plate (100), reserving the anchoring length of a reserved metal corrugated pipe (11) in the pier body longitudinal high-strength steel bars (4) in the prefabricated recycled concrete hollow pier column (1), welding the pier body longitudinal high-strength steel bars (4) with a connecting steel plate (100), sleeving the pier column steel inner pipe (3) into the pier column FRP outer pipe (2), temporarily fixing the pier column FRP outer pipe (2), welding the connecting steel plate (100) with the pier column FRP outer pipe (2) and the pier column steel inner pipe (3), then pouring recycled concrete (5) between the pier column FRP outer pipe (2) and the pier column steel inner pipe (3), and finally pouring the hollow concrete corresponding to the shear nails (6) in the pier column inner pipe (3), curing, and curing to complete the prefabricated concrete template (1; s2, binding a capping beam longitudinal rib (9) and a capping beam stirrup (8) in the prefabricated capping beam (7) in a factory to form a steel reinforcement framework, and then fixing a reserved metal corrugated pipe (11) and a reserved metal pipeline (13), wherein the reserved metal pipeline (13) is used for tensioning a prestressed anchor rod (12), supporting a template, pouring concrete, curing a test piece, removing the template, and finishing the manufacture of the prefabricated capping beam (7); S3, conveying the prefabricated regenerated concrete hollow pier column (1) and the prefabricated capping beam (7) to a construction site, fixing the prefabricated regenerated concrete hollow pier column (1), aligning a reserved metal corrugated pipe (11) in the prefabricated capping beam (7) with a pier body longitudinal high-strength steel bar (4) extending out of the prefabricated regenerated concrete hollow pier column (1) from top to bottom, adjusting the levelness and the verticality of the structure, enabling a prestressed anchor rod (12) to penetrate through a pier column steel inner pipe (3) and a reserved metal pipeline (13) of the prefabricated capping beam (7), enabling the top of the prestressed anchor rod to extend out of a prestressed anchor rod pore channel on a connecting steel plate (100), enabling the bottom of the prestressed anchor rod (12) to penetrate through a prestressed anchor rod pore channel on a connecting steel plate (100), and then anchoring to complete site assembly work of the prefabricated regenerated concrete hollow pier column (1) and the prefabricated capping beam (7); S4, stirring the high-strength concrete UHPC (10) on site, filling the reserved metal corrugated pipes (11) with the high-strength concrete UHPC (10) by adopting a grouting device, grouting the high-strength concrete UHPC (10) from the tops of the reserved metal corrugated pipes (11) by adopting a grouting method, and ensuring that the corrugated pipes are full in grouting, leveling and finishing the assembly work of the prefabricated regenerated concrete hollow pier column (1) and the prefabricated capping beam (7) when the high-strength concrete UHPC (10) overflows from the reserved metal corrugated pipes (11).

Description

FRP-steel tube recycled concrete hollow pier column-bent cap assembly type node structure and construction method Technical Field The invention relates to an assembled node of a pier column and a bent cap, in particular to an assembled node structure of an FRP (fiber reinforced plastic) -steel tube recycled concrete hollow pier column and a bent cap and a construction method, and belongs to the technical field of bridge engineering. Background The national strategy of traffic promotes large-scale infrastructure construction, and provides wide development space and market opportunity for bridge construction. Bridge engineering is used as a key part of traffic infrastructure, and has an important promotion effect on economic development, so that the engineering construction requirements of bridge structures are increasing. At present, the traditional bridge construction adopts the construction technology of casting in situ, and has the problems of long construction period, difficult control of construction quality, high environmental pollution and the like, which is very unfavorable for the bridge structure. The prefabricated assembly technology has the advantages of short construction period, energy conservation, environmental protection, functional diversification and the like, so that the problems existing in the cast-in-situ technology are solved by applying the advantages of the prefabricated assembly technology. The eastern European Asia land at the land of China is positioned between the Pacific ocean seismic zone and the European Asia seismic zone, the eastern coastal area and the southwest area have frequent seismic activities, and the bridge engineering is greatly influenced. The earthquake-resistant performance of the pier column-bent cap node structure of the prefabricated bridge structure is still weak, in order to solve the problem, the conventional technical means is to improve the longitudinal reinforcement ratio of the pier column structure, but the improvement of the reinforcement ratio brings great obstruction to the pre-embedding of the grouting sleeve and the grouting corrugated pipe which are commonly adopted at present, so that the connection precision of the prefabricated splicing node is too high, the connection quality of the pier column-bent cap node is reduced, and the structure economy is also not facilitated. Therefore, how to ensure reasonable connection structure and earthquake resistance of the bridge prefabrication assembly type structure node is a key problem. In the assembled pier column-bent cap node connection technology, the grouting metal bellows has the advantages of reliable connection, good durability, good anti-seismic performance and the like, and the traditional pier column-bent cap node structure is connected to meet the anti-seismic requirement, so that the reinforcement ratio of longitudinal reinforcements is generally improved, the number of the grouting metal bellows is excessive, the construction precision is high, and the placement of the reinforcements inside the bent cap is disturbed. Disclosure of Invention Aiming at the defects in the prior art, the invention provides an FRP-steel tube recycled concrete hollow pier column-bent cap assembly type node structure and a construction method, which are used for solving the problems of reliable connection, good durability and earthquake resistance. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The FRP-steel tube regenerated concrete hollow pier column-bent cap assembled node structure consists of a prefabricated regenerated concrete hollow pier column and an upper prefabricated bent cap thereof, wherein the prefabricated regenerated concrete hollow pier column and the prefabricated bent cap are connected into a whole through a prestressed anchor rod in a reserved metal pipeline and a high-strength concrete UHPC in a reserved metal corrugated pipe; The prefabricated cover beam comprises a reserved metal corrugated pipe and a reserved metal pipeline, wherein high-strength concrete UHPC is poured into the reserved metal corrugated pipe; The pier column longitudinal high-strength steel bars are pre-buried around the interior of the recycled concrete between the pier column steel inner pipe and the pier column FRP outer pipe, and the portion, extending out of the prefabricated recycled concrete hollow pier column, of the upper portion of the pier column longitudinal high-strength steel bars is inserted into the reserved metal corrugated pipe; connecting steel plates extend out of two sides of the top of the pier stud steel inner pipe respectively, the inner ends of the connecting steel plates are welded with the pier stud steel inner pipe, and the top end of the pier stud FRP outer pipe is welded and fixed with the lower surface of the connecting steel plates; The connecting steel plates are respectively reserved with a high-strength steel bar channel and a prest