A Method for Measuring Bridge Deflection by Suspending Main Cable
A bridge deflection and bridge technology, applied in the direction of mechanical solid deformation measurement, etc., can solve the problems of accuracy, reliability and convenience being difficult to balance, and achieve the effect of convenient carrying and installation, overcoming unfavorable restrictions, and avoiding horizontal interference.
Inactive Publication Date: 2017-11-24
CHANGAN UNIV
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Problems solved by technology
[0011] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method for measuring bridge deflection by suspending the main cable, which is not only suitable for small and medium span bridges, but also for long-span bridges, and solves the problem of bridge deflection measurement in the prior art. Difficult to balance accuracy, reliability and convenience
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[0050] This embodiment provides a method for suspending the main cable to measure the deflection of the bridge, such as Figure 1 to Figure 7 As shown, the Black Pier Bridge is located in Yulin City, Shaanxi Province, with 5 holes of 20 meters, the upper part of the prestressed reinforced concrete I-beam, and the lower part of the reinforced concrete pier. Deck width: Net-7.0+2×1.0m (sidewalk and guardrail). The main cable 8 adopts 7*7=49 strands of steel wire twisted to form a steel wire rope with a diameter of 4mm. The method specifically includes the following steps:
[0051] Step 1. Before measuring the deflection of the bridge, drive a set of ring-type M8 expansion bolts 1 2-1 and 2-2 expansion bolts into the pre-determined position in the anti-collision wall 4 on the outside of the expansion joint. Install the sliding track 5 on the first 2-1, install the column 6 on the sliding track 5, the column 6 and the sliding track 5 are locked by the lock nut 3, and install the...
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The present invention provides a method for suspending a main cable to measure bridge deflection. According to the method, the main cable is erected above the bridge anti-collision guardrails at two sides of a bridge, dial gauges are hung upside down on the main cable, and the probe of each of the dial gauges is in contact with the bridge anti-collision guardrails. Cross beams which are horizontally placed under the bridge bottom of the bridge are hung on the main cable and are equipped with multiple dial gauges according to needs, and the probe of each of the dial gauges presses against the beam bottom of the bridge. The plane where the dial gauges installed under each main beam on a cross beam is is perpendicular to the plane where the dial gauges hung on the main cable is, and thus the detection points on the bridge beam are in net distribution. A test loading vehicle passes the bridge surface of the bridge, and combined with a data collection instrument, the dial gauges collect the deflection data of the bridge. The method has the advantages of simple device structure, convenient carrying and installation and no affection of transport operation, measurement points are on all main beams, the operation is easy and the accuracy is high, the anti-interference ability is high, and the influence of bad weather such as wind and rain can be overcome.
Description
technical field [0001] The invention belongs to the field of road bridges and relates to the measurement of bridge deflection, in particular to a method for measuring bridge deflection by suspending a main cable. Background technique [0002] Bridge deflection is a very important data for bridge structures. It directly reflects the overall vertical stiffness of the bridge structure, and judges the weak parts of the bridge and the integrity of the structure. It is necessary to accurately measure the static and dynamic deflection values of the bridge. At present, there are many bridge deflection measurement methods at home and abroad, which are mainly divided into two categories, namely, full manual measurement method and automatic measurement method; the full manual measurement method includes mechanical measurement method and optical instrument measurement method, and mechanical measurement method is divided into two categories: 100% measurement method and hanging method,...
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IPC IPC(8): G01B5/30
CPCG01B5/30
Inventor 王晓明杨纪鹏段瑞芳孙天雷晓鸣冯加利周峰琦
Owner CHANGAN UNIV