A hoisting portal frame and its application method in the construction of special-shaped antisymmetric steel main tower

Abstract

The invention discloses a hoisting gate frame which comprises a support device and a slideway device, wherein the support device comprises vertical support structures and transverse connection structures which are arranged among the vertical support structures; the vertical support structures comprise a plurality of first longitudinal beam units; the slideway device comprises first slideway structures and second slideway structures; the first slideway structures are respectively arranged on two sides of the top of the support device; the second slideway structures are vertically arranged between top surfaces of two groups of first slideway structures; steel strand lifting devices are arranged on the second slideway structures. A use method of the hoisting gate frame comprises the following steps: conveying tower sections to the support device by using ships, hoisting up the tower sections by using the steel strand lifting devices, further hoisting the tower sections to corresponding parts in design positions, dropping the tower sections by using the steel strand lifting devices, adjusting the in-air alignment postures of the tower sections, and welding after the tower sections are adjusted in place. By adopting the hoisting gate frame disclosed by the invention, large-size equipment is not occupied for a long time, the construction cost is lowered, and the construction expense can be reduced.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a hoisting portal frame and its use method in the construction of special-shaped antisymmetric steel main towers. Background technique [0002] With the continuous advancement of science and technology, bridge construction has developed by leaps and bounds. Especially since the beginning of the 21st century, bridge construction has flourished. There are countless long-span bridges across rivers. Stayed bridges and suspension bridges, among them, cable-stayed bridges mainly use main towers, main girders, and cable-stayed cables as load-bearing components, and the main tower types are mostly A-type, inverted Y-shaped, H-shaped, and single columns. Conventionally, large-scale hoisting equipment is used for hoisting construction, such as floating cranes and tower cranes. The use of floating cranes and tower cranes for construction has the advantages of high safety and simple operat...

AI Technical Summary

Problems solved by technology

[0002] With the continuous advancement of science and technology, bridge construction has developed by leaps and bounds. Especially since the beginning of the 21st century, bridge construction has flourished. There are countless long-span bridges across rivers. Stayed bridges and suspension bridges, among them, cable-stayed bridges mainly use main towers, main girders, and cable-stayed cables as load-bearing components, and the main tower types are mostly A-type, inverted Y-shaped, H-shaped, and single columns. Conventionally, large-scale hoisting equipment is used for hoisting construction, such as floating cranes and tower cranes. The use of floating cranes and tower cranes for construction has the advantages of high safety and simple operation, but this construction method also has the following disadvantages: First, it takes a long time Occupies large hoisting equipment, which is expensive to use; second, the construction is easily affected by water level changes, especially the stability of the floating crane is insufficient, and the hoisting accuracy is not high; third, in the construction of the special-shaped anti-symmetrical steel main tower, it is necessary to The hoisting position of the segment has been adjusted many times, and large-scale equipment is used for mobile high-altitude lifting. The moving speed is slow, which increases the difficulty of construction and affects the construction progress

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