Roll-on/roll-off shipping method for long large steel box girder segment across obstacles

Abstract

The invention relates to a roll-on / roll-off shipping method for a long large steel box girder segment across obstacles. The method comprises the following steps of: moving the long large steel box girder segment by using an ashore hydraulic berth bogie; when the cantilever end of the long large steel box girder segment is moved to be above the stern of a transport ship, continuing to move the long large steel box girder segment to the transport ship by using an onboard hydraulic berth bogie; and simultaneously adjusting the floating stability of the transport ship by using an onboard inflow and drainage system installed on the transport ship during the process of moving to the transport ship. The invention solves the problem that the ashore track and the onboard track can not be butted by using the relay method of the ashore and onboard hydraulic berth bogies. In the technical preparation stage, the structural strength of the steel box girder is calculated, the length of the cantilever of the steel box girder is determined, and the arrangement positions of the ashore and onboard bogies are determined according to the calculation structure. Therefore, relay is successfully realized, and the shipping work of the long large steel box girder segment under the condition of complex tides is successfully realized.

Description

technical field [0001] The invention relates to a method for rolling off a ship with a long section of a steel box girder across obstacles. Background technique [0002] At present, domestic bridges are erected in the form of long-section hoisting of steel box girder. The long section of such steel box girder is large in size and weight, which puts forward high requirements for the long section of the long section to be shipped and shipped. Technology For such long sections of steel box girder, it is usually completed by floating cranes. Due to the limitation of the length of the floating crane boom, the long sections are required to be arranged laterally along the coastline. Due to the heavy weight of the long sections, they need to be called Floating cranes with large tonnage are expensive, and only the ro-ro longitudinal loading scheme can be considered. The processing and manufacture of many sea-crossing bridges are usually carried out at the seaside, and the loading c...

AI Technical Summary

Problems solved by technology

[0002] At present, domestic bridge erection sometimes adopts the hoisting form of steel box girder long sections. The long sections of steel box girders have large dimensions and heavy weight, which put forward high requirements for long section shipments. Existing Technology For the loading of such long sections of steel box girders, floating cranes are usually used. Due to the limitation of the length of the jib of the floating crane, it is required that the long sections should be arranged horizontally along the coastline. Due to the heavy weight of the long sections, it is necessary to call Floating cranes with a large tonnage are very expensive, so we can only consider the roll-on-roll-off longitudinal loading solution

The processing and manufacturing of many sea-crossing bridges are usually carried out by the sea, and the loading conditions are largely limited by the tidal conditions. At the same time, sometimes there are obstacles on the construction site that cannot be dismantled or crossed during segmental delivery, resulting in The steel box girder transfer track cannot be docked with the track on the ship, and it is usually completed by a very expensive floating crane

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