The difficulties of Engineering Organizations

Civil constructionis not finished, when the lifting of the main structure,on-site assembly is a large areato carry out, sothe reis the phenomenon of multi-cross construction jobs. The venue is so small,the construction site layout,component transport and the large cranemachine routes are very limited. At the same time, the complex engineering structures, each hoisting a paragraph between inter related and must be assembled in a certain order, lifting, otherwise it will work slow down phenomenon. The construction side need are a sonable coordination and overall management, the engineering organizations is very difficult.

The difficulties of Components and Lifting

Truss column to reduce assembly difficulty,this project will be used to lying on the spelling of the main truss will be used to spelling level(inner fight except for the main truss stand),so the assembly after the lifting must be done before turning overthe work. Due to the component size and weight, when turning the set of hanging points and lug selection difficult, in particular,stand up,truss columns and hanging ears stand up and lifting force are subject to change, need to consider three by force. At the same time,turn over in the process of stability is more difficult to control.Docking with multiple orifices are box-section truss columns and the main truss segment port segmented lifting, box-section, to ensure that the multiple-nozzl ecounter partsaccuracy, such a great difficulty. Lifting, it need to adjust the angle and azimuth of goods egmentation component, while the large size and heavy weight components, theangle adjustment is very difficult.

The stability of the high-altitude component difficulties

This project uses the bulk method lifting method (ie, segmented) piecewise lifting the upper component wind load of segmentation is not connected into the overall structure did not form an overall, less stable, especially truss columnthe upper section and the poor stability of segmented main truss, lifting the order must be reasonable (as far as possible end to end, block lifting) and lateral stabilization measures (such as anchor wind cable rope, etc.).

The welding difficulties

This project, both sheet welding, there are thick plate welding, both flat welding, vertical welding and overhead welding, both high-strength steel welding and the welding of steel castings, welding a heavy workload. Sheet metal welding deformation of large, thick plate welding deposited large, temperature control and high labor intensity requirements.The altitude welding, welding weatherproof anti-low temperature measures by the winter rainy season makes welding more difficult.

The difficulties of install precision control

As the construction process, the structure itself due to weight and temperature changes will produce deformation, deformation under load will produce and support the tire rack, combined with the complex structural form, are box-section components, the location and the direction are strong,installation accuracy is affected by the environment of the scene temperature changes affect the installation accuracy is extremely difficult to control, difficulty in construction.Construction must take the necessary measures in advance to consider how to adjust and eliminate installation error, how to measure and monitor, so that deformation to be completed in a controlled state, to ensure that the overall shape and construction quality.

The construction is very difficult due to the high quality requirements

This project, whether it is the appearance of quality, such as dimensions, weld appearance, or the intrinsic quality, such as weld quality and grade of welding residual stress elimination, are very demanding, and field construction conditions.Large span spatial structures, the temperature deformation and thermal stress, designed to determine the block close and close temperature operation is difficult.