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Structural repair and reinforcement of port cranes can extend their service life.
Release Time：
2019-06-14 12:00:29
Crane equipment has become a widely used material handling tool. Employed for tasks beyond human capacity, cranes serve as indispensable assistants in work and daily life, playing a vital role in driving national economic development. Specifically, port cranes boost port trade and economic activities, and structural reinforcement is occasionally required to extend their service life and enhance operational performance.
Crane equipment has become a widely used material handling tool. Employed for tasks beyond human capacity, cranes serve as indispensable assistants in work and daily life, playing a vital role in driving national economic development. Specifically, port cranes boost port trade and economic activities, and structural reinforcement is occasionally required to extend their service life and enhance operational performance.
Reinforcement Scheme
The chassis adopts a beam-type structure, mainly bearing bending stress, with stress concentrated at the junction of the distal end from the outriggers and the slewing mechanism. Additionally, the cross-section of the chassis is a box-type structure. Based on these actual conditions and combined with construction requirements, we have decided to adopt a scheme of separately performing base plate reinforcement on the vertical plates and transverse plates, and welding the two base plates into an integrated structure with a diagonal bracing plate. In this way, the three plates form a stable triangular frame structure. Through theoretical calculations, the structural strength is increased by more than 15%, which meets the actual operational requirements.
Material Quality
The selected material has properties similar to those of the crane's base material to ensure welding effectiveness, and its performance meets the required strength standards. After material selection, samples of the base material and the new material are taken separately, welded together, and subjected to destructive testing. The test result shows that the fracture occurred in the base material, indicating that both the new material and the welded joint have higher strength than the base material—thus ensuring the construction quality and meeting the strength requirements.
Welding Process
Strict requirements are imposed on six key aspects, namely surface cleaning and preheating, electrode drying, reinforcement plate processing, welding machine preparation, welding operation procedures, and post-welding heat preservation, thereby ensuring the construction quality.
Strength Inspection
Inspect the welded joints for missing welds and burn-through defects to verify compliance with operational requirements. After completion of reinforcement, conduct strength testing on the structural components to determine the percentage increase in the chassis structural strength. Compare this percentage with the required 15% to conclude whether the construction is qualified.
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