CN-121992708-A - Connection structure of pier column and bearing platform of assembled bridge pier and construction method

CN121992708ACN 121992708 ACN121992708 ACN 121992708ACN-121992708-A

Abstract

The invention relates to the technical field of bridge engineering construction, and aims to solve the problems that in the prior art, mounting conflict of embedded bars and bearing platform templates, difficulty in ensuring overlap joint length of the bars, poor connection caused by large alignment difficulty of the bars and sleeves, and low construction efficiency. The invention has the advantages that the embedded bars are matched with the template of the bearing platform in installation, the overlap joint length of the bars is convenient to ensure, the alignment of the bars and the sleeve is simple, and the connection stability and the construction efficiency are ensured.

Inventors

DAI YICHAO
ZHU ZHENPING
LIU GUANGCHAO
GUO ZHANGHUI
BI JUN
YANG LIN
XUE LIAN
LANG MENG
LI XUERUI

Assignees

中铁八局集团有限公司
中铁八局集团昆明铁路建设有限公司

Dates

Publication Date: 20260508
Application Date: 20260206

Claims (10)

1. The utility model provides a connection structure of assembled pier stud and cushion cap which characterized in that: the concrete pouring device comprises a prefabricated bearing platform (1), pier columns (2), first steel bars (3), second steel bars (4), third steel bars (5), sleeves (6) and pouring seam concrete (7); The third steel bar (5) is pre-buried in the prefabricated pile cap (1), the third steel bar (5) comprises a first straight line section (8) and a first hook section (9), the first hook section (9) is bent and arranged at a preset angle, the bent first hook section (9) is not beyond the installation range of the internal mold template of the prefabricated pile cap (1), and the first straight line section (8) of the third steel bar (5) is fixedly connected with the stressed steel bar of the prefabricated pile cap (1); The sleeve (6) is a high-strength threaded sleeve, the first steel bar (3) comprises a second straight line section (10) and a second hook section (11), one end of the second straight line section (10) of the first steel bar (3) is provided with an external thread, one end of the external thread of the first steel bar (3) is screwed into the sleeve (6), the embedded depth is one half of the total depth of the sleeve (6), the second hook section (11) of the first steel bar (3) is fixedly connected with the stressed steel bar of the pier column (2), the other end of the sleeve (6) corresponds to the connecting surface of the pier column (2) and the connecting surface of the prefabricated bearing platform (1), and the port of the sleeve (6) is flush with the connecting surface of the pier column (2); The second steel bar (4) is a straight bar, one end of the second steel bar is provided with external threads, one end of the second steel bar (4) with the external threads is screwed into a part, which is not occupied by the first steel bar (3), in the sleeve (6), and after the first hook section (9) of the third steel bar (5) is broken off, the hook end of the third steel bar is attached to and fixedly connected with the non-threaded end of the second steel bar (4); pouring joint concrete (7) is poured in a gap between the pier stud (2) and the prefabricated bearing platform (1) and wraps the lap joint part of the second reinforcing steel bar (4) and the third reinforcing steel bar (5) and the sleeve (6).
2. The connection structure of an assembled pier stud and a bearing platform according to claim 1, wherein: the specification of the external threads of the first steel bars (3) and the specification of the external threads of the second steel bars (4) are matched with the internal thread specification of the sleeve (6).
3. The connection structure of an assembled pier stud and a bearing platform according to claim 1, wherein: The second steel bar (4) and the first hook section (9) of the third steel bar (5) are bound and fixed through binding wires, and the distance between binding points is not greater than a preset distance.
4. The construction method of the pier column and the bearing platform of the assembled bridge pier is characterized by comprising the following steps of: Firstly, constructing a prefabricated pile cap (1), processing a third steel bar (5), bending a first hook section (9) of the third steel bar (5) according to a preset angle, constructing a pile cap template, binding pile cap stressed steel bars, fixedly connecting a first straight line section (8) of the third steel bar (5) with the pile cap stressed steel bars, ensuring that the bent first hook section (9) does not contact with the pile cap internal mold template, pouring pile cap concrete and curing, removing the pile cap template, chiseling off surface layer concrete at the connecting surface of the prefabricated pile cap (1), and straightening the first hook section (9) of the third steel bar (5); Step two, prefabricating a pier column (2), machining a first steel bar (3), machining external threads at one end of a second straight line section (10) of the first steel bar (3), selecting a high-strength sleeve (6) matched with the threads of the first steel bar (3), screwing one end of the external threads of the first steel bar (3) into the sleeve (6) to form a combined piece of the first steel bar (3) and the sleeve (6), constructing a pier column (2) template, binding the stressed steel bars of the pier column (2), fixedly connecting a second hook section (11) of the combined piece of the first steel bar (3) and the stressed steel bars of the pier column (2), ensuring that the port of the sleeve (6) is flush with the connecting surface of the pier column (2), pouring the pier column (2) concrete, curing, and removing the pier column (2) template; step three, the pier stud (2) is connected with the steel bar in place, the prefabricated pier stud (2) is hoisted above the prefabricated bearing platform (1), the position is adjusted to enable a sleeve (6) at the bottom of the pier stud (2) to correspond to the position of a third steel bar (5) on the connecting surface of the prefabricated bearing platform (1), the pier stud (2) is lowered to enable the bottom of the pier stud to be in contact with the connecting surface of the prefabricated bearing platform (1), a second steel bar (4) is processed, external threads are processed at one end of the second steel bar (4), one end of the second steel bar (4) with the external threads is screwed into the sleeve (6), the non-threaded end of the second steel bar (4) is attached to the hook end of the third steel bar (5), and the second steel bar (4) is fixedly connected with the first hook section (9) of the third steel bar (5) through binding; And fourthly, constructing pouring seam concrete (7), cleaning gaps between the pier columns (2) and the prefabricated bearing platforms (1), setting templates, sealing, pouring high-strength pouring seam concrete (7), vibrating and compacting, curing the pouring seam concrete (7), and completing connection after the strength of the pouring seam concrete reaches the design strength.
5. The method for constructing the pier stud and the bearing platform of the fabricated bridge pier according to claim 4, wherein the method comprises the following steps: In the construction of the prefabricated bearing platform (1), the preset bending angle of the first hook section (9) of the third steel bar (5) is 90 degrees.
6. The method for constructing the pier stud and the bearing platform of the fabricated bridge pier according to claim 4, wherein the method comprises the following steps: in the prefabrication construction of the pier stud (2), one end of the first steel bar (3) with external threads is screwed into the sleeve (6), and the embedded depth is one half of the total depth of the sleeve (6).
7. The method for constructing the pier stud and the bearing platform of the fabricated bridge pier according to claim 4, wherein the method comprises the following steps: in the construction of the pier column (2) in place and the connection of the steel bars, the length of the external threads of the second steel bars (4) is identical to that of the external threads of the first steel bars (3).
8. The method for constructing the pier stud and the bearing platform of the fabricated bridge pier according to claim 4, wherein the method comprises the following steps: In the binding step of the pier column (2) in place and being connected with the steel bars, the binding overlapping area of the second steel bars (4) and the first hook sections (9) of the third steel bars (5) is determined according to design specifications, double-strand binding wires are adopted for cross binding during binding, and binding points are evenly distributed along the overlapping length.
9. The method for constructing the pier stud and the bearing platform of the fabricated bridge pier according to claim 4, wherein the method comprises the following steps: After the external threads of the first steel bar (3) and the second steel bar (4) are machined, thread precision detection is carried out, the completeness and the no damage of thread profile are ensured, and the fit clearance between the thread profile and the internal threads of the sleeve (6) meets the design requirement.
10. The method for constructing the pier stud and the bearing platform of the fabricated bridge pier according to claim 4, wherein the method comprises the following steps: The preset bending angle of the first hook section (9) of the third steel bar (5) is determined according to the thickness of the inner die template of the prefabricated bearing platform (1).

Description

Connection structure of pier column and bearing platform of assembled bridge pier and construction method Technical Field The invention relates to the technical field of bridge engineering construction, in particular to a connecting structure of an assembled pier column and a bearing platform and a construction method. Background In the prior art, the pier column and the bearing platform are usually connected by pouring concrete after being lapped by reinforcing steel bars, and connecting reinforcing steel bars are required to be pre-buried in the stage of prefabricating the bearing platform so as to realize effective lapping with the reinforcing steel bars of the subsequent pier column. However, the traditional embedded bar mode has a plurality of technical defects that firstly, in order to ensure the subsequent overlap joint length with pier column steel bars, the embedded bars need to extend out of a bearing platform for a certain length, which can seriously affect the installation and dismantling of the template in the bearing platform, so that the template installation difficulty is increased, the construction efficiency is reduced, even the template deformation or the steel bar displacement can be caused by the interference between the template and the steel bars, secondly, the part of construction scheme is used for avoiding affecting the template installation, shortening the extension length of the embedded bars, but failing to meet the overlap joint length required by the specification, so that the mechanical property of a connecting node is reduced, and the structural potential safety hazard exists. Therefore, how to design an assembled pier column and bearing platform connection structure and a construction method capable of avoiding the installation conflict between the embedded bars and the bearing platform template, guaranteeing the overlap joint length of the bars and the stability of the connection nodes, and improving the construction efficiency is a problem to be solved urgently in the current bridge engineering construction field. Disclosure of Invention The invention aims to provide a connecting structure and a construction method of an assembled pier column and a bearing platform, which are used for solving the problems of incomplete connection and low construction efficiency caused by the difficulty in aligning a reinforcing steel bar and a sleeve, difficulty in guaranteeing the overlapping length of the reinforcing steel bar and the mounting conflict of a template of the bearing platform, and the like in the prior art. Embodiments of the present invention are implemented as follows: The embodiment of the invention provides a connecting structure of an assembled pier stud and a bearing platform, which comprises a prefabricated bearing platform, a pier stud, a first steel bar, a second steel bar, a third steel bar, a sleeve and pouring seam concrete; The third steel bar is pre-buried in the prefabricated bearing platform, the third steel bar comprises a first straight line section and a first hook section, the first hook section is bent at a preset angle, the bent first hook section does not exceed the installation range of the internal mold template of the prefabricated bearing platform, and the first straight line section of the third steel bar is fixedly connected with the stressed steel bar of the prefabricated bearing platform; The sleeve is a high-strength threaded sleeve, the first steel bar comprises a second straight line section and a second hook section, one end of the second straight line section of the first steel bar is provided with an external thread, one end of the first steel bar with the external thread is screwed into the sleeve, the embedded depth is half of the total depth of the sleeve, the second hook section of the first steel bar is fixedly connected with the stressed steel bar of the pier column, the other end of the sleeve corresponds to the connecting surface of the pier column and the prefabricated bearing platform, and the sleeve port is flush with the connecting surface of the pier column; the second steel bar is a straight steel bar, one end of the second steel bar is provided with external threads, one end of the second steel bar with external threads is screwed into a part, which is not occupied by the first steel bar, of the sleeve, and after the first hook section of the third steel bar is straightened off, the hook end of the third steel bar is attached to and fixedly connected with the non-threaded end of the second steel bar; and pouring the pouring seam concrete into a gap between the pier stud and the prefabricated bearing platform and wrapping the lap joint part of the second steel bar and the third steel bar and the sleeve. According to the connecting structure of the assembled pier column and the bearing platform, the pre-bent third steel bars are adopted, so that installation conflict between the steel bars and the templates in construction