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Unloading control technology for long-span steel truss arch structures based on prestress tension monitoring

A technology of prestressed and arched structures, applied in building construction, processing of building materials, construction, etc., can solve problems such as difficult to guarantee the reliability of calculation results and measurement results, ignoring the interaction, etc.

Active Publication Date: 2018-05-25
NANJING CONSTR ENG GRP
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Problems solved by technology

[0007] The purpose of the present invention is to provide a large-span steel truss arch structure unloading control technology based on prestressed tension monitoring, which solves the problem that the existing technology ignores the joint action of steel trusses, arch structures and prestressed ground tension beams, and the calculation results of the model and It is difficult to guarantee the reliability of on-site measurement results

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  • Unloading control technology for long-span steel truss arch structures based on prestress tension monitoring
  • Unloading control technology for long-span steel truss arch structures based on prestress tension monitoring
  • Unloading control technology for long-span steel truss arch structures based on prestress tension monitoring

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Embodiment Construction

[0027] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] For the large-span structure formed by the joint action of steel trusses, arch structures and prestressed cables, during the unloading process, the stress in the prestressed cables is monitored in real time through dynamic strain testing instruments, and the spatial displacement of the truss structure and the arch structure is monitored in combination with a total station , realizing the optimization of the unloading sequence and the control of the unloading process of the long-span steel truss-arch structure.

[0029] Model analysis: SAP2000 software is used to establish the overall model of the large-span space structure of the connecting body and the ground tension beam, and the model is calculated and analyzed according to the construction conditions on site, and the theoretical analysis results are obtained. Monitoring plan: Accor...

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Abstract

The invention discloses a large-span steel truss arch structure unloading control technology based on prestress tension monitoring. Through overall calculation and monitoring, the unloading and prestress tension processes are reasonably controlled to ensure the safety and use of the structure construction process. the quality of the process. Establish a finite element model of the overall structure, and conduct simulation analysis on the entire construction process to determine the stress value and settlement value of the structural steel truss and arch structure, and the horizontal displacement value of the ground tension beam; monitor the construction process in real time, record and analyze the stress and The displacement value, combined with the theoretical value, is adjusted for unloading or prestressing tension in the next stage. The invention adopts the total station, GPS and stress sensor to monitor the whole construction process in real time, which improves the completeness, precision and safety of the monitoring.

Description

technical field [0001] The invention belongs to the technical field of large-span steel structure construction, and relates to a large-span steel truss arch structure unloading control technology based on prestress tension monitoring. Background technique [0002] The monitoring of stress and displacement during prestressed tensioning is an important link and key technology in the process of long-span prestressed tensioning. Whether the monitoring scheme is reasonable is related to the safety of the construction process and the quality of the main structure. The real-time control of the pulling process and the safety guarantee of the structure. [0003] The monitoring of prestress generally takes the stress of the prestressed cable and the horizontal displacement of the caps at both ends of the prestressed cable as monitoring indicators, and the horizontal displacement of the caps is the most intuitive. The current monitoring method is generally as follows: monitor the stre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04B1/35E04G21/12
Inventor 杨进文张怡鲁开明王进
Owner NANJING CONSTR ENG GRP
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