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Method for monitoring large span bridge structural deflection

A bridge structure and large-span technology, applied in the direction of measuring devices, fluid pressure measurement using liquid as pressure-sensitive medium, instruments, etc., to achieve the effect of large measurement range, less pollution, and improved measurement stability

Inactive Publication Date: 2004-11-03
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to propose a large-span bridge structure deflection monitoring method with good measurement stability, large measurement range and low measurement cost to overcome the shortcomings of various current monitoring methods and meet the needs of actual engineering for structural deformation monitoring

Method used

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Embodiment Construction

[0011] The method for monitoring the structural deflection of a long-span bridge proposed by the present invention has been tried in a structural safety monitoring system of a bridge in southern my country. The bridge is a prestressed concrete cable-stayed bridge with a main span of 340 meters. There are 17 monitoring points on the deck and downstream of the bridge, and there are 17 pressure transmitters 3 accordingly. In addition, set a reference point to account for changes in the tank level. The water tank 1 is made of stainless steel and is arranged at the pier of the main span of the bridge. The horizontal steel pipe 2 adopts a galvanized water pipe with an inner diameter of 50mm, communicates with the bottom of the water tank 1, and connects with the pressure transmitter 3 at the monitoring point. The connection cable 4 of the pressure transmitter adopts 2×32 / 0.2 RVVP cable, the junction box 5 and the A / D converter 6 are common equipment, and the calculation and monitor...

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Abstract

The present invention relates to safety monitoring system, and is flexibility monitoring method for large span bridge structure. Whole bridge pressure field is first established with water tanks set in the unchanged location, water pipes set horizontally and city water supply system to lead water pressure to deformation location of the bridge; and the pressure transducer is fixed to the measured part. The pressure change is converted into flexibility change and monitored with the computerized monitoring system, which consists of water tank, water pipes, pressure transducer, A / D converter, computer, etc. The present invention has high measurement stability, great measurement range, low measurement cost and high practical value.

Description

technical field [0001] The invention belongs to the technical field of beam engineering, and specifically relates to a structural deflection monitoring (measurement) method in a long-span bridge structural safety (health) monitoring system. Background technique [0002] Large bridges are huge investments and have far-reaching impacts on social and economic development. In bridge design, construction, operation and other links, any slight negligence may lead to major losses or even catastrophic accidents, ranging from affecting traffic and consuming a lot of maintenance costs, to destroying bridges and causing huge casualties and property losses . [0003] Ensuring the safety of long-span bridges during operation is a serious task for bridge engineering circles and government management authorities all over the world, and it is also a common problem in management and decision-making, which has great social, economic and scientific significance. In the early 1990s, foreign c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/32G01L7/18G06F3/00
Inventor 陈德伟
Owner TONGJI UNIV
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