Research about Construction Technique of Long-Span Arch Grid Structure
Abstract Grid structure is a type of space structure consisted of steel components and joints. Because of itself characteristics of high rigidity , good , strong seismic performance , light self weight as well as economic steel consumption ,it is widely used in different span and shaped buildings. There are lots of researches and rich experience about grid frame composed by square pyramid unit on its construction method. Because of its explicit force transmission route, good loading capacity and stability, grid frame structure is often selected by architects and structure engineers. Therefore, it is of necessary and significant to study the construction techniques of long-span steel grid structure. In the view of the development of apace structure, the characteristic and research statue of grid frame structure are introduced briefly. The construction methods, techniques and keys are discussed, including High altitude scattered-install method, strip and piece hoisting method, high altitude sliding method, the whole hoisting method, the whole exalting and ascending method and so on, all of which are applied successfully in most projects. Based on the construction method of Yanliang cultural centre, the installation method for long-span
steel grid structure is studied. The possibility of each method is compared and technological difficulty of this project is analyzed. Considering the character of this building, construction technique of \set unit integral by sliding\middle to aide\scheme was proposed referenced above techniques and principle, which has good practical value showed by the analysis. Keywords long-span steel grid-frame structure, lifting segment by segment, unit integral by sliding, construction scheme, eliding unit. 1 Introduction
With the development of culture and economic, large space is needed. While long-span space structure, especially grid structure, just meets to this requirement for its self advantages of high rigidity, good integrity, strong seismic performance, light self weight as well as economic steel consumption. Therefore, grid frame structure is widely applied by architects and structure engineers indifferent public buildings, such as in Gymnasium, hangar, club, exhibition hall and waiting hall etc. The architecture technology of long-span structure in a country has been regard as an important symbol to measure its architectural
technology level. The development of long-span grid structure in our country is later than abroad, which leads to our construction Technique is lower. Thereupon, how to improve our Construction Technique combining practical situation is an urgent task.
Construction Technique is always a mainly hindered factor in the development of long-span space grid structure. How to hoist and construct to guarantee the balance of structure and the approach of force situation before and after construction is a closely concerned problem. Hoisting segment by segment technology is widely applied in long-span space grid structure, which was improved for the increasing of span and complexity of structure style. The force on each bar in using stage is quite different from in hoisting when increasing hoisting ability of equipment and the size of hoisting unit, it is critical to estimate the construction stress accurately in each hoisting unit in hoisting segment by segment technology. Based on the practical project of Yanliang cultural centre, the installation method for long}pan steel grid structure is studied; the development and application of Hoisting segment by segment technology and sliding technology in grid structure are introduced in this paper. 2 Introduction about Construction Method of Long-span
Space Grid Structure
Because of the diversity of structure style, different construction method is selected, such as high altitude scattered-install method, strip and piece hoisting method, high altitude sliding method, the whole hoisting method, the whole exalting and ascending method and so on. Their specific installation process is introduced one by one as follows.
2.1 High Altitude Scattered-install Method
All members and nodes are spliced to a whole at altitude design position in high altitude scattered install method, including whole sent method applied in assembling one by one and cantilever method applied in whole splicing of small frame unit in altitude or the splicing of triangle mesh in reticulated spherical shell. The characteristics of this method are as follows:①comparing with other method, it is the most original and simple method; efficiency is low while security is well.②massive temporary support frame is needed in construction, time consuming in putting up and demolition of temporary support frame is always more than in assembling of structure, leading to longer construction period.③The weight of members and nodes should be in the allowable range of worker operation. Therefore, it is economical in grid installation with small scale by this
