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Method for achieving prestressed cylindrical cable bar latticed shell structure forming by aid of length-adjustable press rod

A cylindrical reticulated shell structure and prestressing technology, applied in building construction, building material processing, construction, etc., can solve the special structure, forming process and construction technical measures of self-balancing prestressed cable-rod cylindrical reticulated shell structure It is unclear and hinders the application and development of new structural systems, so as to avoid implementation difficulties, good application prospects, and save engineering costs.

Inactive Publication Date: 2013-08-07
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the forming process and construction technical measures of this structure are not yet clear, which hinders the application and development of this new structural system
[0003] Generally, the cable method is the structural forming method usually used in the construction of prestressed space structures. However, there are still great difficulties in applying the cable method to the forming process of the self-balancing prestressed cable-strut cylindrical reticulated shell structure. The main The reason is that the structure of the self-balancing prestressed cable-strut cylindrical reticulated shell is special
In the self-balancing prestressed cable-strut cylindrical reticulated shell structure, there are many cables, and the design prestress of most cables is different. During the tensioning process, the forces of the cables have a great influence on each other, and the tension control stress of the cables is determined. It is difficult, and the number of components associated with each node of the self-balancing prestressed cable-strut reticulated shell structure is large, it is difficult to provide the necessary work space and anchoring space for the tension of a large number of cables, it is difficult to implement the project, and the quality of the structure is difficult. ensure

Method used

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  • Method for achieving prestressed cylindrical cable bar latticed shell structure forming by aid of length-adjustable press rod
  • Method for achieving prestressed cylindrical cable bar latticed shell structure forming by aid of length-adjustable press rod
  • Method for achieving prestressed cylindrical cable bar latticed shell structure forming by aid of length-adjustable press rod

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specific Embodiment approach 1

[0039] Specific implementation mode one: as Figure 1 to Figure 5 , the method for realizing the forming of the prestressed cylindrical cable-strut reticulated shell structure with the length-adjustable compression rod described in this embodiment is realized according to the following steps:

[0040] Step 1. Calculate the net blanking length of each cable:

[0041] The calculation formula for the blanking length of any cable i in the reticulated shell structure is:

[0042] l in formula (1) 0i Indicates the net blanking length of any cable i in the cylindrical reticulated shell structure, and the net blanking length is the length of the cable between the outer edges of the two spherical nodes connected to the cable after the cable is installed; l di Indicates the net design length of any cable i in the cylindrical reticulated shell structure, and the net design length refers to the length of the cable between the outer edges of two spherical nodes connecting the cables de...

specific Embodiment approach 2

[0055] Embodiment 2: In step 3, during the elongation operation of the compression bar, the jacking device is installed on the compression bar to be extended, and the angle α of the support bar is reduced by stretching the screw rod through the push-type jack, and the compression bar is lifted. push long. Fix the backing tube 4 on the connecting rod 2, remove the jacking device after the backing tube and the pressing bar are temporarily or permanently fixed. Other implementations are the same as the first implementation.

specific Embodiment approach 3

[0056] Specific implementation method three: in step three to determine the bar elongation scheme, according to the operation sequence between the operating units, it should start from the structural basic unit at the center of the top of the reticulated shell structure, and then proceed to the boundary direction of the reticulated shell structure in batches carried out successively. The principle of selecting two or four structural basic units adjacent to the formed structural unit as a batch of forming operations, for Figure 5 For the reticulated shell shown, according to the above principles, the operation sequence among the various operation units is ①→②→③→④→⑤→⑥→⑦→⑧, and the rod elongation operations of the operation units of the same batch must be completed simultaneously. Carry out steps 4 and 5 according to this principle. Other implementations are the same as the first implementation.

[0057] Experimental verification of the effectiveness of the inventive method

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Abstract

The invention relates to a method for achieving prestressed cylindrical cable bar latticed shell structure forming by aid of a length-adjustable press rod and relates to the construction field. For a self-balancing prestressed cable bar latticed shell structure forming method, an explicit and reliable forming method is not provided in the prior art, and accordingly application and development of the novel structural system are seriously impeded. The method for achieving prestressed cylindrical cable bar latticed shell structure forming by aid of the length-adjustable press rod is characterized in that the net blanking length of each inhaul cable is calculated, the blanking length of the press rod is determined, extending schemes of the press rod in all forming stages of a latticed shell are determined, member assembling of the latticed shell structure is performed, initial forming of the latticed shell structure is performed, and final forming of the latticed shell is performed. The calculation formula of the blanking length of any one inhaul cable i in the latticed shell structure is as follows. The method solves the problem of forming technology defect of the self-balancing prestressed cable bar latticed shell structure, indirectly stretches and draws the prestressed inhaul cables by extending the rod, and solves the problem of implementation difficulty of an inhaul cable method.

Description

technical field [0001] The invention relates to the field of construction, in particular to a forming method of a self-balancing prestressed cable-strut cylindrical reticulated shell structure. Background technique [0002] The self-balancing prestressed cable-strut cylindrical reticulated shell structure is a space steel structure composed of flexible cables and rigid compression rods. Different from ordinary cylindrical reticulated shell structures, the structural basic unit of this structure is a kind of A hexahedron composed of cables and struts (such as figure 1 shown). The stiffness of the structure is obtained from the tension of the cables. The structure is in a relaxed state before forming. It must be formed by applying prestress in each cable of the structure, and the working mechanism and characteristics of the structure depend on its own shape and prestress. Therefore, the tension forming technology of the cables in the reticulated shell structure is the key te...

Claims

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Application Information

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IPC IPC(8): E04G21/14
Inventor 李国东左宏亮武胜付浩然鄂婧
Owner NORTHEAST FORESTRY UNIVERSITY
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