Steel columns offset: 1, construction preparation (1) preparation of steel erection construction organization. Its contents include: calculating the number of steel members and connections, select hoisting machinery, determine water program, to determine the lifting method, schedule planning, determine labor organization, planning component yard, to determine the quality standards and safety measures. (2) the basis of test preparation and steel components. Its contents include: the axis of measurement error, prepare the ground bearing surface, the bearing surface and bearing surface elevation and levelness of inspection, measuring bolt position and an extended length of the bearing surface and so on. Foundation bearing surface, bearing and bolt the tolerances comply with the relevant regulations. Before lifting should be based on "steel construction and acceptance" (GB50205-2001) requirements, carefully examine the shape and geometry of the chemical mechanical installation of steel components, if any deviation, before lifting should try to eliminate. (3) if necessary, checking the stability of hoisting steel members, checking formulas please check the relevant information. March 2011, the State Administration of Quality Supervision and the State Administration of Work Safety jointly issued the "large-scale lifting equipment to install security monitoring and management system implementation plan" to raise large lifting machinery for the purpose of precision machinery intrinsically safe installation, the progressive realization of the large-scale lifting Installation Tasks security monitoring and management system on the machinery. Large lifting machinery in order to strengthen security management and control technology, and promote the use of large lifting machinery units and production units to implement safety responsibility mechanical installation, on-site operations to promote standardization and regulation to curb the occurrence of major accidents lifting machinery to achieve lifting a fundamental improvement in the security situation machinery. Embodiments in five steps, has now entered the third stage, combined with the pre-trial gravel mechanical installation, organize relevant type testing agency to the existing "crane safety monitoring and management system" to carry out experimental verification. After the 2015 plan, complete management system installation work to achieve standardization of this work, normalization. Electrical machinery installation _ Shandong Lu PICC quality and quantity (certified) _ mechanical installation provided by Shandong Linyi in Shandong Machinery Equipment Installation Company. Shandong Lu Machinery Installation Co., Ltd. (www.sdlzqz.com) Shandong Jinan, industrial maintenance, installation of leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Lifting leadership in Shandong Lu staff warmly welcome all inquiries negotiations to create Shandong Lu lifting a better future.