Upright Lifting Large-Tonnage Box Girder Bridge Construction
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Solution Overview
Problem
Traditional methods for upright lifting of large-tonnage box girders in bridge construction are inefficient due to the need for extensive temporary roadways, high costs, and difficulties in soft soil foundations, as well as the use of large-span and high-risk lifting apparatuses that occupy significant land and increase construction costs.
Innovation Solution
A method involving the construction of a lifting station with girder lifting bases and traveling rails adjacent to bridge piers, allowing for direct lifting and placement of box girders, reducing the span and land use of lifting apparatuses, and utilizing a small-span apparatus for efficient and stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a traditional side lifting method is used with a lifting station arranged on one side of the bridge line, then the box girder can be lifted to the bridge, but the land use area is large and the span of the lifting apparatus is huge
Solution Approach 1:
The lifting station is repositioned from a side arrangement to a central arrangement directly below the bridge line, utilizing the vertical dimension more effectively. This dimensional repositioning allows the lifting apparatus to operate directly overhead, reducing both the lateral land use area and the span requirements of the lifting mechanism.
Solution Approach 2:
Bridge piers are reserved in advance during the bridge construction planning stage, and the lifting station is constructed at these pre-selected locations before the actual girder erection begins. This preliminary preparation enables the lifting station to be optimally positioned centrally below the bridge line, avoiding the need for large-span side lifting apparatus.
2Reliability
If a large-span lifting apparatus is used to lift the box girder from a side position, then the girder can be erected on the bridge, but the stability of the apparatus is poor and use risks are high
Solution Approach 1:
By changing the lifting approach from lateral (side) positioning to vertical (central) positioning directly below the bridge line, the lifting apparatus operates in a more stable configuration. The vertical alignment reduces lateral forces and moment arms, thereby improving stability and reducing operational risks without requiring overly complex stabilization mechanisms.
3Productivity
If a temporary road is filled from the middle line of the bridge to transport the girder, then the girder conveying apparatus can reach the bridge, but the construction of adjacent sections is affected and the temporary engineering quantity is large
Solution Approach 1:
Bridge piers are reserved and the lifting station is constructed in advance at these pre-selected locations before girder transport begins. This preliminary action eliminates the need to fill temporary roads through the middle line of the bridge, as girders can be transported to the centrally positioned lifting station without disrupting adjacent section construction.
Solution Approach 2:
The lifting station and girder lifting bases are extracted and positioned at the center of the bridge span, separate from the adjacent construction sections. This spatial separation allows independent construction activities in different areas, preventing interference between girder transport/erection operations and adjacent section construction.
4Ease of manufacture
If the lifting station is arranged at a side position, then the apparatus can be set up, but the land use area is large and construction costs are high
Solution Approach 1:
The lifting station is repositioned from a lateral arrangement to a central arrangement directly below the bridge line, utilizing the vertical space more efficiently. This repositioning reduces the lateral land footprint required for the lifting station and its operational radius, while maintaining ease of setup through standardized construction procedures at the centrally located reserved piers.
Data Source
AI summary
A construction method for the upright lifting of a large-tonnage box girder to a bridge, and an erection method for the large-tonnage box girder. The construction method comprises: constructing a lifting station (2) at reserved bridge piers (1); disposing a girder lifting base (3), lifter traveling rails (4), and a mounting lifter (6) in the lifting station (2); directly erecting a box girder (7) by the lifter (6) in a way that the lifter (6) travels to a position above the base (3) and erects the box girder (7). The erection method further comprises: lifting by the lifter (6) a single set of transport and erection apparatuses or two sets of transport and erection apparatuses to a bridge, a girder transport vehicle (9) cooperating with a bridge erecting machine (10) to repeatedly complete the erection of the box girder (7); hoisting by the lifter (6) the transport and erection apparatus off the bridge; lifting by the lifter (6) the box girder (7) within the scope of the reserved bridge pier (1) to the erected box girder (7); and constructing the reserved bridge piers (1); completing by the lifter (6) the erection of the box girder (7) within the scope of the reserved bridge piers (1). The construction and erection methods for the box girder occupy a small space and have high efficiency.