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Study of Accurate Positioning Technique for Stay Cable Guide Tubes of Cable-Stayed Bridge Using Internal Steel Guide Tubes
Author(s): 
Pages: 36-39
Year: Issue:  5
Journal: World Bridges

Keyword:  cable-stayed bridgestay cable guide tubeinternal steel guide tubeout-of-pylon point coordinatesanchoring point coordinatesaccurate positioningconstruction technique;
Abstract: To improve the spatial positioning accuracy of stay cable guide tubes of cable‐stayed bridge and further promote the actual implementation of surveying and positioning technique ,the accurate positioning technique for stay cable guide tubes of cable‐stayed bridge using internal steel guide tubes is studied .The main components of the internal steel guide tube involve a slender semi‐cylindrical axle (small V‐shaped notches are cut along the central line of the axle) w hich con‐nects two semi‐circular flanges ,one end of the axle level with the semi‐circular flange and the other end going through the semi‐circular flange .During the positioning of the stay cable guide tubes of cable‐stayed bridge , after preliminary positioning , the internal steel guide tubes are threaded through the stay cable guide tubes ,use the internal steel guide tubes to transform the coordinates of the tube‐out‐of‐pylon points and the coordinates of theoretical anchoring points from imaginary points to actual ones ,carry out direct accurate re‐measuring and positioning for stay cable guide tubes ,and then use the spatial straight line equation of the two coordinate points to judge the actu‐al measuring points .The technique has been used to the Second Jiaojiang River Bridge in Taizhou City .T he engineering practice proves that the technique is able to realize the accurate positioning of the pylon‐end stay cable guide tubes of cable‐stayed bridge in a simple and rapid manner and the accuracy is within 5 mm .
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