The purpose of this project is to add a steel gantry to the south side of the compressor plant of the hydrochloric acid plant. As this project is a lifting operation within the plant area, for safety reasons, the necessary lifting risk assessment must be done and care must be taken to avoid damage to the original equipment and instruments during lifting. Before lifting, adequate preparation and arrangements should be made for transport access, power supply, fire-fighting facilities, main materials and machinery and labor. Now, according to the site survey, after the steel beams and columns are grouped on the ground, the proposed solution is to use a 50 tonne vehicle crane for a one-time lifting in place.
The lifting work shall execute the following codes, specifications and requirements:
① Code for Construction of Lifting Work for Engineering Architecture
② Specification of Safe Operation for Lifting Work
③ Performance List of Conveying flatbed trucks, cranes
④ Management System of Safe Operation of Cranes Issued by Bayer Company
⑤ All concrete requirements for lifting work set out by the Owner and Engineering Supervisor.
Various specific requirements of the owner and the works supervisor for the lifting works.
三、Lifting execution procedure 吊装施工程序
1、Field and ground base treatment 场地及地基处理
a、The main road for the Plant shall keep unblocked. 装置的主干道始终保持通畅。
b、Ensure the crane legs have sufficient bearing areas. Bayer provide the area and the concealed work document.保证吊车支腿有足够的承压面积（业主提供此区域隐蔽工程资料）。
2、Crane shall enter into site and be in position as per drawings. (see lifting drawings for details)
3、Written consent by the owner and management company shall be obtained before removing existent iron balustrade if necessary.
4. Steel structure grouping construction procedure.
4.1 Firstly, the two steel columns are placed flat on the level ground in the order of the construction drawing for erection, and the two ends are temporarily supported with triangular Φ48 steel pipes.
4.2 Lift the steel beam by crane to the middle of the two steel columns for grouping and then tighten the bolts.
4.3 Tie up the lifting points of the gantry steel structure and lift it into position. (See lifting diagram)
5、The hoist spreading position should be approved by Bayer & TJU.
6、Crane shall be hooked and start lifting. Lift the steel apart from the truck to the work area radius and stay for 5 minutes. Inspect the support of crane, ground, cable wire, clamp and body of container. Lifting shall be continued after written confirmation with the owner.
7、After finishing of lifting work, the Owner shall sign and approve.
8、Arrangement of period for crane application 吊车台班时间安排。
One working period of crane is 1 days. 汽车吊吊车工作台班为1天.
3.2 Technical presentation already done and prepared lifting plan approved by the owner.
3.3 Gantry steel structure lifting in place
After the gantry frame steel structure is lifted into position, first do not unload the buckle immediately, let the sling bring up the strength, after the two sides of the steel column with the pad iron pad solid, the middle traveling beam bolts tightened, and then slowly land unhooked. Immediately carry out secondary grouting, and replace the damaged bolts on both ends of the steel column after the concrete has reached a certain strength.