A method for installing roof trusses of large-span and large-space steel structures

Abstract

The invention relates to an installation method for a large-span large-space steel structure roof truss. According to the method, large-span truss sectional hoisting and a truss accumulation sliding technology are adopted, and the installation precision is ensured by checking the concrete strength, sliding and unloading tool strength during truss assembly and the concrete strength during roof truss assembly through establishment of an FEM model before hoisting and sliding. The installation method for the large-span large-space steel structure roof truss has the advantages that not only the construction cost can be reduced, but also the installation period and precision can be better controlled through optimization construction of the existing sliding construction methods.

Description

technical field [0001] The invention relates to a method for installing a podium roof truss, in particular to a large-span and large [0002] Installation method of space steel structure roof trusses. Background technique [0003] At present, the installation of low-altitude, small-span and large-roof pipe trusses is mostly directly installed by cranes, but for roofs with a span of tens of meters or even hundreds of meters, due to the small turning radius of the crane, the construction period is tight, and the construction site is relatively narrow. The overall assembly site of the truss cannot be completed with a super large crawler crane, so it must be completed with the help of a mobile tower crane. [0004] For the installation of large-span and large-space steel structure roof trusses, the following three methods are generally used for installation: [0005] 1. According to the hoisting performance of the truck crane, the truss is divided into sections, and each secti...

AI Technical Summary

Problems solved by technology

[0005] 1. According to the hoisting performance of the truck crane, the truss is divided into sections, and each section is assembled in the factory; at the same time, tire frames are erected at the installation position of the roof truss according to the sections. After the components are transported to the site, they are hoisted by the truck crane. The construction process of this installation method is simple; the hoisting operations are all performed by the truck crane, which does not occupy the working time of the tower crane; the parts are assembled in the factory, and the assembly accuracy is high; but this installation method has the following disadvantages: (1) The truss has a large weight , and the installation position is relatively high, so it is necessary to use a large-tonnage truck crane, which is not conducive to controlling the construction cost; (2) A large number of tire frames are required during the installation of the truss, which is not conducive to controlling the construction cost; (3) Using a truck crane for hoisting A new steel structure yard needs to be set up on the side of the podium

[0006] 2. The tire frame is erected in the podium, and the components are transported to the site in the form of parts, and then the parts are hoisted to the installation position by QTZ80 tower crane for in-situ assembly; this installation method assembles the roof truss in situ, saving construction time; no need The use of other hoisting equipment saves construction costs; all of the podium parts are hoisted with QTZ80 tower cranes, which does not affect the hoisting of the steel structure of the tower; but this installation method has the following disadvantages: (1) The roof trusses are assembled in situ on site, There are many sections and the construction progress is slow; (2) The QTZ80 tower crane needs to be dismantled after the installation of the podium roof truss structure is completed, which prolongs the rental time of the tower crane and increases the construction cost; (3) The hoisting performance of the QTZ80 tower crane is average. The hoisting performance of the tower crane has to increase the segment, so the amount of tire frame will be increased; (4) Due to the increase in the number of truss segments, the truss will be increased to a certain extent

[0007] On-site assembly workload and assembly error of the structure

[0008] 3. Divide the single truss into three sections, each section is assembled in the factory and transported to the site after the assembly is completed. During on-site installation, a tire frame is erected at the north end (12 axis) of the roof truss, and then hoisted by TCR6055 or JCD260 tower crane After the truss is assembled, install it in place by pushing and sliding; compared with the above two methods, this installation method has the following advantages: (1) The assembly work is only carried out at the 12-axis position, which can reduce the tire load. (2) TCR6055 and JCD260 tower cranes have good hoisting performance, which can reduce component segmentation, thereby reducing the workload of component assembly; (3) QTZ80 tower crane can be used for the installation of secondary beams between roof trusses, improving the Utilization efficiency of on-site hoisting equipment; (4) No need to use other hoisting equipment, which can save construction costs as much as possible; (5) The assembled truss unit can slide while the next truss can be assembled, which can effectively compress The installation period of this part of the steel structure; (6) The components transported to the site can be stacked in the storage yard on the side of the tower, and there is no need to set up a steel structure storage yard in the podium; but this installation method has the following disadvantages: the sliding construction process is relatively complicated , the sliding construction needs to be calculated before construction, and the installation accuracy of the sliding track is required to be high during the construction process

Images