A Construction Method for Lifting and Limiting Buffering of Steel Box Girders

Abstract

A steel box girder hoisting limit buffer construction method, the steel box girder is hoisted to the bridge surface by a lifting device, the bridge surface is provided with a lateral limit mechanism and a vertical buffer mechanism, the lifting device hoisting The steel box girder is buffered and stably hoisted to the designated position through the lateral limit mechanism and the vertical buffer mechanism. Using the above method, the box girder transportation and hoisting operation in the strong tidal sea area can be realized, and compared with the existing technology, the preparation work before the hoisting operation is simple, and the whole hoisting operation process is less affected by the hydrological conditions, which can effectively improve the hoisting operation. efficiency.

Description

technical field [0001] The invention relates to the field of offshore bridge construction, in particular to a steel box girder hoisting limit buffering construction method. Background technique [0002] There are usually three construction methods for the installation of bridge steel box girders: one is the overall hoisting of the crane ship, which has the advantages of high efficiency, but it needs to be equipped with a large crane ship; the second is the segmental hoisting of the bridge deck crane, which is economical , but the construction efficiency is low; the third is to hoist the steel box girder segments to the poured reinforced concrete bridge deck in pieces, after welding and assembling, the overall push is completed to complete the installation. This method combines the overall hoisting of the crane ship and the bridge deck crane Advantages of machine split hoisting. [0003] In the bridge construction project in the swell sea area, for the above-mentioned third ...

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Problems solved by technology

[0003] In the bridge construction project in the swell sea area, for the above-mentioned third steel box girder installation and construction method, when using small and medium-sized cranes to hoist the steel box girder segment from the transport barge to the poured reinforced concrete bridge deck, due to the waves The motion response of the crane ship and the transport barge, on the one hand, there is a potential collision risk at the moment when the steel box girder segment is hoisted away from the barge; The vertical forced vibration will lead to the failure of the hoisting operation, and even damage the permanent structure such as the steel box girder to be installed when it is placed, causing unnecessary economic losses

[0004] The existing Chinese patent "Large tonnage box girder launch system and construction method" (application number 201010621058.X) discloses a method for transporting and erecting box girders in the construction of offshore bridges, which mainly relies on setting up on the wharf in the construction area Aisle girders, and the use of walking carts on the aisle girders to transport the box girders can effectively avoid the impact of water levels, but the amount of preparation work is relatively large, and the dismantling of the aisle girders is required after the completion of the box girder erection. Undoubtedly, it will affect the progress of the entire project. In addition, when the girder erection area is located at the center of the entire project, the traveling distance of the traveling cart to transport the box girder is relatively long. Due to the heavy weight of the box girder, the transport speed of the traveling cart is relatively slow , so the construction efficiency will inevitably decrease

[0005] The existing Chinese patent "A method for erecting steel box girders for waterway transportation on strong tidal sea areas" (application number 201310010008.1) discloses a hypothetical method for box girder transportation on strong tidal sea areas. The hydrological changes in the tidal waters, and after confirming that the hydrological conditions meet the operation conditions of the box girder transportation and erection through sea trials, the operation is carried out, but it is greatly restricted by the hydrological conditions. When the hydrological conditions do not meet the operation requirements, the box girder cannot be transported and erected. , which affects the construction progress, and the preparatory work of "research on the hydrological change law of the strong tidal sea area where the channel bridge needs to be built" also takes a certain amount of time

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