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Method for detection of bridge hinge joint condition through FWD (Falling Weight Deflectometer)

A technology of hinge and condition, applied in the field of bridge hinge condition detection using FWD, can solve the problems of high load test cost, long-term traffic closure, etc., and achieve the effect of high accuracy, small impact, accurate and effective measurement

Inactive Publication Date: 2016-03-02
SHANGHAI PUJIANG BRIDGE & TUNNEL HIGHWAY MANAGEMENT CO LTD
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Problems solved by technology

[0009] (3) The damage of hinge joints is always accompanied by other diseases such as water damage. According to statistics, there is water seepage in hinge joints in more than half of plate girder structure bridges
However, load testing is costly and requires longer traffic closures

Method used

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  • Method for detection of bridge hinge joint condition through FWD (Falling Weight Deflectometer)
  • Method for detection of bridge hinge joint condition through FWD (Falling Weight Deflectometer)
  • Method for detection of bridge hinge joint condition through FWD (Falling Weight Deflectometer)

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Embodiment Construction

[0038] The specific implementation method of the present invention will be further described below in conjunction with the examples. This embodiment is used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0039] The detection scheme adopted in this embodiment is to detect each hinge joint on the cross-section in the middle of the span first, and then select the next section at intervals in the direction of the bridge head in the longitudinal direction.

[0040] see image 3 and Figure 4 , when the traffic on the bridge to be inspected is easy to close, the FWD inspection vehicle can be used to detect the transverse hinge capacity of the hinge joint in the direction perpendicular to the hinge joint. "Design Code" (JTGD40-2002) evaluates the load transfer capacity of hinged joints:

[0041] .

[0042] In the formula: is the load transfer capacity coefficient of hinge joint;

...

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Abstract

The present invention relates to a method for detection of a bridge hinge joint condition through a FWD (Falling Weight Deflectometer). The method comprises the following steps: detecting each hinge joint on a cross section in a span; selecting the next section at an interval of L in the vertical direction toward the direction of the bridge head; detecting the horizontal hinge joint capability of each hinge joint in the direction perpendicular to each hinge joint through adoption of the FWD; evaluating the hinge joint condition according to the grading standard of the hinge joint load transfer capability. According to the invention a FWD is used for detection and evaluation of hinge joint capabilities of hinge joints in the maintenance detection of a built bridge, and is able to quickly, accurately and effectively measure the hinge joint capabilities of hinge joints of a bridge, therefore the influence on the traffic is small and the accuracy is high.

Description

technical field [0001] The invention relates to a detection method for bridges, in particular to a method for detecting bridge hinge joints by using FWD. Background technique [0002] Reinforced concrete and prestressed concrete hollow slab bridges are widely used because of their light weight, good structural performance, convenient construction, and mass prefabrication in factories. However, with the rapid growth of heavy-duty vehicles, along with various factors such as the influence of the natural environment, unreasonable partial design, and limited construction technology conditions, the traffic capacity of some highway bridges in service is facing a severe test. [0003] Before the bridge fails, the hinge joints always fail first, and the hinge joint damage will inevitably lead to the deterioration of the bridge's durability. There are three common forms of concrete hinge joints in engineering: circular, diamond and funnel-shaped. Among them, the funnel-shaped joint ...

Claims

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Application Information

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IPC IPC(8): G01M99/00E01D22/00
CPCG01M99/00E01D22/00
Inventor 王晓宇杨群夏姝丽任载权
Owner SHANGHAI PUJIANG BRIDGE & TUNNEL HIGHWAY MANAGEMENT CO LTD
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