CN-122013669-A - Construction method for tower-hanging multi-buckle-cable collaborative pushing steel box girder

CN122013669ACN 122013669 ACN122013669 ACN 122013669ACN-122013669-A

Abstract

The application discloses a construction method for a tower-hanging multi-buckle cable collaborative pushing steel box girder, and relates to the technical field of bridge construction. The method comprises the steps of arranging a pushing support system between a first side pier and a main tower, assembling a steel box girder to a main tower position, continuously pushing the steel box girder to penetrate through the main tower to form a first cantilever, installing a first buckling rope on the main tower, connecting two ends of the first buckling rope with the steel box girders on two sides of the main tower respectively, continuously pushing and synchronously assembling subsequent sections, installing a second buckling rope on the main tower after the conditions are met, and repeating the steps of pushing, assembling and adding the buckling rope until the front end of the steel box girder moves to the second side pier. According to the application, the multi-channel buckling ropes connected with the girder body are sequentially added on the main tower, so that multi-point elastic support is provided for the long cantilever steel box girder in the pushing process, the girder end downwarping is actively controlled, the structural stress is improved, the girder guide can be greatly reduced or even cancelled, and the construction difficulty and cost are reduced.

Inventors

ZHAI SHIHONG
HU TENGFEI
HUANG CAN
PENG PENG
HUANG JIANFENG
WANG JIE
PENG CHENGMING
JIANG YILIN
ZHOU RENZHONG
WANG CHAO

Assignees

中交第二航务工程局有限公司

Dates

Publication Date: 20260512
Application Date: 20260306

Claims (9)

1. A construction method for a tower-hung multi-buckle cable collaborative pushing steel box girder is characterized by comprising the following steps: an assembling support system is arranged between the first side pier (1) and the main tower (3); Assembling the steel box girder (8) based on the assembling support system until the front end of the assembled steel box girder (8) extends to the position of the main tower (3); Continuously pushing the steel box girder (8) to enable the steel box girder to pass through the main tower (3) along the forward bridge direction and extend to a first preset length so as to form a first cantilever state; a first buckling rope (11) is arranged on the main tower (3), and two ends of the first buckling rope (11) are respectively connected with the girder bodies of the steel box girders (8) positioned at two sides of the main tower (3); Continuously pushing the steel box girder (8) to move along the forward bridge direction, and synchronously splicing subsequent sections on the splicing support system at the tail end of the steel box girder (8); When the second buckling rope installation condition is met, installing a second buckling rope (15) on the main tower (3), and connecting two ends of the second buckling rope (15) with steel box girders (8) at two sides of the main tower (3) respectively; repeating the steps of pushing, assembling and adding the buckling rope until the front end of the steel box girder (8) moves to the second side pier (2).
2. The construction method for the tower-hung multi-buckle cable collaborative pushing steel box girder according to claim 1 is characterized in that an assembling support system is arranged between a first side pier (1) and a main tower (3), an assembling support (4) and a plurality of temporary piers (5) are arranged in a construction area between the first side pier (1) and the main tower (3), the assembling support (4) and the temporary piers (5) are sequentially arranged at intervals along the forward bridge direction, the assembling support (4) is arranged close to the first side pier (1) and used for assembling operation of a section of the steel box girder (8), and walking pushing equipment (6) is arranged on the assembling support (4) and each temporary pier (5).
3. The construction method for the tower-hung multi-buckle cable collaborative pushing steel box girder is characterized in that the method for assembling the steel box girder (8) based on the assembling support system comprises the steps of assembling the steel box girder (8) section by section on an assembling support (4), pushing the assembled steel box girder (8) section forwards through a walking pushing device (6) on the assembling support (4) to enable the front end of the assembled steel box girder to be supported on an adjacent temporary pier (5), and repeating the assembling and pushing steps until the front end of the steel box girder (8) moves to a main tower (3).
4. The construction method for the tower-hanging multi-buckle cable collaborative pushing steel box girder is characterized in that a bracket (7) is pre-built on the main tower (3), and the front end of the steel box girder (8) moves onto the bracket (7) along the forward bridge under the action of walking pushing equipment (6).
5. The construction method for cooperatively pushing the steel box girder by the tower-hanging multi-buckle rope according to claim 4, which is characterized in that the method for continuously pushing the steel box girder (8) to penetrate through the main tower (3) along the forward bridge direction and extend to the first preset length comprises the step of pushing the steel box girder (8) to move along the forward bridge direction until the length of the front end of the steel box girder (8) extending out of the bracket (7) reaches the preset cantilever length allowed by design under the current working condition.
6. The construction method for the tower-hung multi-buckling-rope collaborative pushing steel box girder is characterized in that a supporting frame (10) and a guide wheel (9) are installed on the top of a main tower (3), a pulling lug (13) is installed on the steel box girder (8) at a position corresponding to the designed position of the first buckling-rope (11), the middle part of the first buckling-rope (11) is arranged on the guide wheel (9), two ends of the first buckling-rope (11) are respectively connected with corresponding pulling lugs (13) on the steel box girders (8) on two sides of the main tower (3), and tensioning adjustment is carried out on the first buckling-rope (11) by utilizing cooperation of a winch (12) arranged on the steel box girder (8).
7. The construction method for cooperatively pushing the steel box girder by the tower-hung multi-buckling cable, as set forth in claim 6, is characterized in that the first buckling cable (11) comprises two steel cables symmetrically arranged with the steel box girder (8) along the bridge towards the central line.
8. The construction method for the tower-hanging multi-buckle cable collaborative pushing steel box girder according to claim 6 is characterized in that the method for installing the supporting frame (10) and the guide wheels (9) on the top of the main tower (3) comprises the steps of installing the supporting frame (10) on the top of the main tower (3), installing a plurality of groups of guide wheel groups which are arranged at intervals along the transverse bridge direction at the upper end of the supporting frame (10), wherein each group of guide wheel groups comprises a plurality of guide wheels (9) which are arranged at intervals along the longitudinal bridge direction.
9. A construction method for cooperatively pushing a steel box girder by using a tower-hung multi-buckling-rope is characterized in that the method for moving the front end of the steel box girder (8) to a second side pier (2) comprises the steps of tensioning a first buckling-rope (11) through a tensioning system connected with the first buckling-rope (11) when the front end of the steel box girder (8) is pushed to be close to the second side pier (2), adjusting the front end of the steel box girder (8) to slightly tilt upwards, continuously pushing the steel box girder (8) until the front end of the steel box girder (8) moves to be above a preset girder falling position of the second side pier (2), gradually releasing the tension of the tensioning system, and synchronously fine-adjusting walking pushing equipment to enable the front end of the steel box girder (8) to stably fall and be supported on the second side pier (2).

Description

Construction method for tower-hanging multi-buckle-cable collaborative pushing steel box girder Technical Field The invention relates to the technical field of bridge construction, in particular to a construction method for a tower-hanging multi-buckle cable collaborative pushing steel box girder. Background The steel box girder bridge is a bridge structure mainly made of steel, and is widely applied to modern bridge engineering due to the advantages of high tensile strength, light dead weight, convenient construction, safe and reliable structure, short construction period and the like. The pushing method slides the prefabricated steel box girder forward to the design position section by section through a longitudinal pushing system, and is a common construction process for steel box girder construction. The advantage is that a large-span bracket is not required to be erected under the bridge and large mechanical equipment is not required to be used. The construction is not interfered with the topography, water flow, navigation and the like under the bridge. The construction period is short, the cost is low, the economy is obvious, the pushing speed can reach 12-15 m/day, the construction period is shortened by 30-50% compared with the traditional hoisting method, tool equipment (such as a jack and a slideway) can be reused, the single construction cost is reduced, and the construction method becomes the preferred method for erecting the steel box girder. The method comprises the steps of arranging an assembly platform and a plurality of temporary piers in a bridge construction area, installing a walking type pushing device on each temporary pier, assembling guide beams, steel beams and towers on the assembly platform in sections, installing and tensioning the suspension cables on the front side and the rear side of the steel beams, adjusting the front suspension cable and the rear suspension cable to be different initial tensions so as to enable the top of the tower to be pre-biased at a certain angle, starting a walking type pushing device to push a system consisting of the guide beams, the steel beams, the towers and the suspension cables forward and span a plurality of large spans, starting the walking type pushing device to push the system forward for a certain distance, assembling the steel beams in sections, expanding the suspension cables when the front end of the guide beams spans each large span and is supported on a first temporary pier after the large spans, tensioning the suspension cables when each large span is supported on the first temporary pier, and continuously detaching the suspension cables when the suspension cables are in position, and further pulling the suspension cables forward and the system to the position when the suspension cables are designed to be in advance forward. According to the method, the tower and the stay cables are used as auxiliary measures, so that the stress and deflection of the steel beam and the guide beam are improved, the pushing span of the steel beam is increased, and the problem that a bridge with a large span is difficult to push due to the fact that temporary piers cannot be arranged is solved. The method has the advantages that the tower and the stay cable are of temporary structures, the fixed structure is arranged between the tower and the steel beam, the tower is immovable relative to the steel beam, so that the length of the steel beam corresponding to the stay cable of the tower is fixed in the pushing process of the steel beam, the steel beam can only be used as an auxiliary structure of the steel beam at the front end position of the connecting part of the guide beam, the structural strength of the steel beam assembled subsequently cannot be increased through the tower and the stay cable, the problem that the pushing of the steel beam with larger span is difficult to assemble subsequently still exists, in addition, the construction cost of the whole pushing is actually increased by the tower and the stay cable, the construction difficulty is also greatly improved, the construction efficiency is reduced no matter the tower is installed or disassembled, and the requirements on bridge construction efficiency and cost control are not met nowadays. Disclosure of Invention The application aims to solve the defects of the background technology and provides a construction method for cooperatively pushing a steel box girder by using a plurality of tower hanging buckle cables. The technical scheme of the application is that the construction method for the tower-hung multi-buckle cable collaborative pushing steel box girder comprises the following steps: an assembling support system is arranged between the first side pier and the main tower; assembling the steel box girder based on the assembling support system until the front end of the assembled steel box girder extends to the position of the main tower; continuously pushing the steel box girder to enab