In order to ensure smoothness of installation, it is important to make the overhead process, in a safe and orderly condition, which must be planned, organized, step-by-step constructed . , Each job personnel needs to know fairly well, with ease, formulated the following construction scheme: Ⅰ.single girder overhead crane installation situation The capacity of overhead crane is 3 tons, span 13.5m, lifting height 9m,the travelling speed 20m/min. Ⅱ. Preparation of overhead crane installation 1. Choices of installation site The area of overhead crane installation site should be enough to meet the needs of overturn lifting installation, which should be ready to plug in welding machine and other electric tools. 2. Preparation of equipment and tools The project needs welding machine 2 sets, oxygen acetylene 2 sets, manual chain hoist 2 sets, cushion wooden ladder and lifting equipment and truck crane. 3. Preparation of materials In this project, it needs the crane rail of overhead crane, platen, clamp, steel material used for manufacturing baffle of overhead crane, slide wire and welding rod, according to the practical to prepare enough. 4. Personnel allocate Personnel to participate in this project: Electrician 1, fitter 1, riveter 1, welder 1, lifting worker 1, safety/head 1. Ⅲ. The basic safety requirements in the process of overhead crane installation To participate in this project construction personnel strictly abide by rules of safe operation of each type of work in construction, it is forbidden to illegal operations. Ⅳ. The overhead crane installation process 1. Crane rail installation ⑴ Firstly clean up the site, cement beam foundation under rail of overhead crane for acceptance. ⑵ Level-up, setting out. ⑶ Check and straighten\of overhead crane rail, rail top, rail joint connection, looking for positive reinforcement and measurement inspection, leveling, straightening. ⑷ Overhead crane stoper making installation The installation of the crane rail standards to qualify for TJ231-78 "mechanical equipment installation engineering construction acceptance specifications" the provisions of the standard, the whole overhead crane traveling is not more than 10 mm, the difference between the highest and lowest joint of the left, right, offset, on the face are not greater than 1 mm, joint clearance is not greater than 2 mm, span deviation should not be greater than 5 mm, with cross two parallel track elevation relative difference, in the post should not be greater than 10 mm, other place should not be greater than 15 mm. 2. Installation of busbar Sliding wire contact surfaces should be flat and straight, no rust, conductive good and proper installation, across the structure of the expansion joints, should establish compensation device. Power supply wire of conductive contact surface with red paint, and device safety sign in the appropriate position or electric lamp. Such as installing security good slip line should be straight, conductive, such as power supply, with a soft cable to meet the requirements of line number, traction wire rope. 3. Bridge installation of overhead crane Before installation should be in conjunction with the entrusted installation unit, and representatives of manufacturing units together out of the box, according to the random packing belt, count and check the goods are in conformity with the number of parts listed in the packing list whether, whether random file is complete, after the check, make records, signed by three parties representative on the spot, the bridge of assembly and erection of all the participants in the construction personnel to strictly abide by rules of safe operation of each type of work, it is forbidden to illegal operation. Overhead crane assembly, want to put the bridge according to the working position in pad on the shelf, fixed firmly, put end beam, measuring diagonal is poor, should not be greater than 5 mm, span should not be greater than 3 mm, completely conform to the rules, then assembling electric hoist, trolley running clearance should not be greater than 5 mm, final assembly control room. 4. Electrical installation Before overhead crane installation should be familiar with electrical schematic diagram, wiring diagram in detail, electrical assembly drawing and related technical data, understand the operating principles and the function of the various components. In order to accurately and quickly processing installation problems appeared in the process. Check all electrical components and motor of geopolitical resistance shall be not less than 0.8 ohms. Should not be less than 0.4 ohms in the damp environment, check each line is correct, after sure no ber, before the current test run. In the test run, check whether the direction is consistent, travel switch power is in accordance with the requirements of direction, up and down limit device is safe and reliable. The safe and reliable safety device must be qualified before lifting construction, in the process of hoisting, strictly abide by rules of safe operation, it is forbidden to illegal operations. Ⅴ. Overhead crane charged by shell, wire and tube should be reliable grounding, crane rails and any point on overhead crane, the grounding resistance less than 4 ohm. Repeat grounding resistance is not more than 10 ohms. The main circuit and control circuit of insulation resistance is not less than 0.8 ohms. Ⅵ. Overhead run after qualified, will be no load test, static load test and dynamic load test. Qualified self-checking, fill in the completion of the report, notify party a, organize relevant departments to check and accept, qualified after consign is used.