Carriage stepped unloading method after expanding large-span truss structure

A technology of truss structure and rear support frame, which is applied in the direction of pillars, buildings, building maintenance, etc. It can solve the problems that the unloading synchronization of support frames cannot be guaranteed, the progress of civil construction on the ground is affected, and civil work cannot be carried out, etc., so that the sequence of unloading is reasonable , ensuring safety and shortening the construction period

Active Publication Date: 2012-04-25
CHINA RAILWAY CONSTR ENG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In the dismantling operation, at present, synchronous unloading is generally adopted for the dismantling of the support frame, that is, jacks are set on the support frame below the main truss of each truss structure, and the support frames below the main truss of each truss structure are equalized and simultaneously unloaded. Unloading, this unloading method has the following defects: first, there are many unloading equipment invested, and the unloading synchronization of the support frames under each truss structure cannot be guaranteed; second, civil work cannot be carried out while the support frames are unloading, Affected the progress of the ground civil construction, and the overall construction period was extended

Method used

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  • Carriage stepped unloading method after expanding large-span truss structure
  • Carriage stepped unloading method after expanding large-span truss structure
  • Carriage stepped unloading method after expanding large-span truss structure

Examples

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Effect test

no. 1 example

[0050] The first embodiment: for Figure 4 The shown long-span truss structure with 6 truss structures ( Figure 5 for Figure 4 Schematic diagram of the F direction), adopt the following step-like unloading method of the support frame:

[0051] Step 1: Calculate the maximum deflection of the disconnection on a truss structure 20 by the finite element calculation simulation analysis algorithm to be 40 mm, and calculate the deflection of the disconnection according to the material and structural characteristics of the long-span truss structure itself. The maximum allowable stress value of unloading is 310N / mm 2 .

[0052] Step 2: According to the calculated maximum deflection of 40mm and the maximum allowable stress value of unloading 310N / mm 2 , set the number of layer-by-layer unloading N as 2 times, and set the height of each layer-by-layer unloading as 20 mm. The added height of 20mm is equal to the maximum deflection of 40mm, and the unloading stress value is calculat...

no. 2 example

[0063] The second embodiment: for a large-span truss structure with 10 truss structures (one truss structure is the same as a truss structure in the first embodiment, both are Figure 5 The structure shown) adopts the following step-like unloading method of the support frame:

[0064] Step 1: Calculate the maximum deflection of the disconnection on a truss structure 20 by the finite element calculation simulation analysis algorithm to be 87 mm, and calculate the deflection of the disconnection according to the material and structural characteristics of the long-span truss structure itself. The maximum allowable stress value of unloading is 310N / mm 2 .

[0065] Step 2: According to the calculated maximum deflection of 87mm and the maximum allowable stress value of unloading 310N / mm 2 , set the number of layer-by-layer unloading N to 4 times (of course, it can also be set to 2 or 3 times, but the height of each layer-by-layer unloading should be changed accordingly), and the f...

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Abstract

The invention discloses a carriage stepped unloading method after expanding a large-span truss structure, which comprises the following steps that: a flexibility maximal value at a broken place on a truss structure and an allowable unloading maximal stress value are calculated; layer-by-layer unloading number of times N and layer-by-layer unloading height at each time are determined; for each truss structure, a jack is arranged on a supporting bracket below a main truss, cushion blocks with the quantity of M are superimposed onto the supporting bracket, M is equal to N, the height of each cushion block is respectively equal to each layer-by-layer unloading height, and the jack is disassembled; the supporting bracket stepped one-by-one unloading is executed for each truss structure which is sequentially and horizontally arranged until the supporting brackets below the truss structure are completely disassembled. The stepped unloading way is adopted for unloading the supporting bracket,so the unloading sequence is reasonable, the deformation of the truss structure can be effectively controlled, the security of the unloading process can be guaranteed, the quantity of the unloading devices can be reduced through the way for unloading the supporting brackets one by one, and the simultaneous execution of the unloading and the civil work can be realized.

Description

technical field [0001] The invention relates to a stepped unloading method of a supporting frame after the expansion of an existing large-span truss structure, and belongs to the technical field of building structure construction. Background technique [0002] Long-span truss structures are widely used in today's construction industry. Long-span truss structures are generally composed of multiple truss structures. For a truss structure, it includes the main truss and the column feet connected at both ends of the main truss, the distance between the two column feet is the span, and the main truss may include at least one upper chord, multiple main truss webs and multiple lower chords The pedestal may include at least one outer chord, a plurality of pedestal webs and a plurality of inner chords. Adjacent truss structures are connected by secondary truss structures perpendicular to the span direction. The truss structure is generally made of metal, such as the round tube stee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04G25/02E04G23/08E04B1/342
Inventor 吴伟杰吴长路蔡文刚张悦杨智艳王玉生单云高良李建洪陈水祥吴亚东林海通李赞张艳梅尹辉许光斌
Owner CHINA RAILWAY CONSTR ENG GROUP
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