A construction method for an elliptical suspensive dome structure

Abstract

The invention discloses a construction method of an oval suspended dome structure. The method comprises the steps that collision of frame body erection and a prestressed component is inspected by adopting a BIM technology; a tension value and a deformation value of a prestressed rod piece are determined by adopting Midas software; precise blanking is conducted on a special-shaped rod pieces by adopting Tekla software; a ring lock scaffold is adopted as a reticulated shell support frame body, and prestressed rod piece installation is conducted; surrounding trusses are installed and welded by adopting a crank arm lift truck as an operation platform; matchstick-type small assembling is adopted, folding is conducted in the shaped of a Chinese character 'mi', and air assembling is conducted on a single-layer reticulated shell turn by turn from bottom to top in a partition and ring division mode; a total station and a three-dimensional adjustable device are adopted to determine the welding ball point location; prestress tension is conducted in a tension radial rod pulling mode according to the sequence from inside to outside to inside and to outside; a general displacement meter, a vibrating wire gage, a magnetic flux sensor and the total station are adopted to conduct omnibearing monitoring. According to the construction method of the oval suspended dome structure, the constructed project only has an error of 8 mm with a designed camber value after being subjected to tensioning, and advancement of the method is proved.

Description

technical field [0001] The invention relates to a construction method for a suspension dome structure, in particular to a construction method for an elliptical suspension dome structure, and belongs to the technical field of construction engineering steel structures. Background technique [0002] Suspension dome structure, also known as cable-supported reticulated shell structure, is a derivative of the combination of traditional single-layer reticulated shell structure and cable dome structure. It combines the excellent performance of single-layer reticulated shell and cable dome structure. A new type of prestressed space structure system developed on the basis of reticulated shell structure and cable dome structure. It has only been born for more than 20 years. Its structure has reasonable force, high rigidity, light weight, safe and convenient manufacture. It can span large-span spaces more reasonably, more economically and more beautifully, and has initially shown broad ...

AI Technical Summary

Problems solved by technology

[0007] 1. The number of struts is large, and more tensioning equipment is required, and it is generally impossible to achieve synchronous tensioning of the same circle of struts;

[0008] 2. After the construction is completed, the hoop cable is not at the same level, which affects the linear control of the hoop cable;

[0009] 3. Under the condition that the lower end of the strut is required to be lifted, it is not easy to realize that the three axes of the radial rod, the hoop cable and the strut meet at one point

[0015] The disadvantage of this report is that the production cost of the supporting tire frame is high. Although it can be reused, it is unknown when it will be reused. The overall waste is large. Secondly, the supporting tire frame is relatively high, and the safety control is not good. Hidden dangers, supporting the tire frame again cannot be used as a prestressed tensioning operation platform. The radial rods are stretched in batches and cyclically. There are many tension points, many requirements for the operating platform, and good safety. Only supporting the tire frame is not enough; The hoisting accuracy of the upper reticulated shell is poorly controlled; the overall lifting of the lower cable rod system without brackets brings great construction difficulties to the upper docking, and the accuracy is extremely difficult to control; the radial steel tie rods are tensioned in two stages, and there are few tensioning stages. If the symmetrical synchronous tension control is not good, it is very easy to pull the upper reticulated shell off or become unstable

The disadvantage is: there is no clear indication of the gap between the camber value after stretching and the design value

There are other trivial and scattered construction techniques reported in other literatures, all of which are trying to explore the construction of the suspension dome structure, but still have not formed a set of reasonable, effective and systematic suspension dome construction methods

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