Anti-deflection construction method for large-area network frame high-altitude cantilever installation

Abstract

The invention provides a large-area net rack high-altitude cantilever installation anti-downwarp construction method. The method comprises the following steps that two middle roof trusses are firstlyinstalled as starting strides; the starting strides are used as a reference surface, other cantilever installation strides are installed to the two sides in a diffused manner; in the cantilever diffused installation process, the cantilever installation stride net rack deflection is monitored, when about three grids are installed outwards in a diffused manner, and holding rods are used as temporarysupports; the tops of the holding rods are connected with net rack lower string balls through inversed chains; the deflection is adjusted by the inversed chains; when installation to structural columns is carried out, the holding rods are loosened, and the inversed chains are removed; and the above operation is repeated to continuously construct cantilever installation strides to the two sides ina diffused manner until a net rack is installed completely. By means of the method, the problems that full house scaffolds are erected and large-area and long-time occupation of the construction siteis caused are solved, a lot of rental expenses are saved, the lattice support production cost is avoided, a lot of steel is saved, the manual input is reduced, the holding rods can be used in turns,the downwarp value adjustment is simple and fast, and the time limit is accelerated.

Description

technical field [0001] The invention relates to a large-scale network frame construction technology, in particular to a method for preventing downward deflection of a large-area network frame suspended at high altitude. Background technique [0002] With the increasingly tightened national environmental protection policies, the closure of raw material yards in many steel mills, cement plants, power plants and other factories has become an environmental protection project of the general trend, and the requirements for the use of space inside large public and civil buildings are getting higher and higher. Due to its large span and light weight, the space grid structure meets the space and cost requirements of the above-mentioned buildings. This structural form is favored by the owners. [0003] Large-area space grids are generally complex in structure and difficult to install. After the installation of the starting span is completed, the remaining grids are generally completed...

AI Technical Summary

Problems solved by technology

[0003] Large-area space grids are generally complex in structure and difficult to install. After the installation of the starting span is completed, the remaining grids are generally completed by cantilever installation. There are generally two methods to prevent downward deflection during installation. ① Erection of large-area full house scaffolding , in addition to preventing the grid frame from deflecting, it can also be used as a construction operation platform. The disadvantages of this method are: the full house scaffolding has a large area, occupies the construction site for a long time, and the rental cost of the scaffolding is high, which is uneconomical.

②Use a lattice support similar to the standard section of the tower crane to lift the downward deflection part to prevent downward deflection. In the case of undulations, it is necessary to add backing plates or jacks on the top of the lattice support to continuously adjust according to the actual measurement value. This method not only consumes a lot of steel, but also consumes labor and slows down the construction period.

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