Ship unloading method of bridge crane at shallow water wharf

Abstract

The invention discloses a ship unloading method of a bridge crane at a shallow water wharf. Ship unloading track beams are used for compensating for the height difference between the shallow water wharf and a transport chip; bridge crossing track beams are mounted between the ship unloading track beams and the transport ship; ro-ro trolleys are mounted at the position where a cart walking mechanism is demounted; a winch and a pulley set are used for controlling movement of the bridge crane on the ship unloading track beams, and the bridge crane shifts in place; vertical movement of anchoring brackets on the side face of a lower cross beam is controlled by jacking devices; the jacking devices achieve jacking up, the ro-ro trolleys and wharf tracks are demounted, and the cart walking mechanism is mounted and restored; the jacking devices descend till walking wheels of a cart fall into the wharf tracks; and after the jacking devices are moved away, the whole ship unloading work is completed. According to the ship unloading method, the stability of the bridge crane in the horizontal and vertical movement process during ship unloading can be kept, the structure stability and reliability during height decrease can be guaranteed, the bearing requirement of the shallow water wharf can be met, and gravity loads of the bridge crane are transmitted to wharf pile foundations and other stress structures through ship unloading tracks.

Description

technical field [0001] The invention relates to a technical method for rolling and unloading cargo by a bridge crane on a wharf, more specifically, a method for unloading a ship by a bridge crane on a shallow water wharf. Background technique [0002] Bridge cranes (hereinafter referred to as quay cranes) are usually transported by large-scale oceangoing ships, and the whole machine is transported to the user's wharf for delivery. Some of the unloading wharves have a lower elevation, and the water depth at the front of the wharf is relatively shallow (that is, a shallow water wharf). The molded depth of a large transport ship is relatively large, which is greater than the height from the wharf surface to the bottom mud surface of the wharf. Therefore, there is a risk of grounding at the bottom of the ship when berthing at the shallow water wharf. If the water depth requirements for unloading are not met, safe berthing cannot be achieved. Destination for unloading deliveries ...

AI Technical Summary

Problems solved by technology

The overall weight of the quay crane is relatively heavy, generally between 1000T and 2000T, and it cannot slide directly from the owner's deck to the dock. If it slides directly in this way, it must slide to the dock at a relatively small allowable slip angle. On the deep internal site (determined by the form of the quay bridge structure itself, generally no more than 3°), the hoist (wire rope length, reel, etc.) cannot meet this requirement, and the deep site on the wharf has other uses, or There is no deep site, and the working positions of the quay cranes are all on the shore of the wharf, so it is definitely not feasible to unload the ship directly by sliding sideways

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