Quick measurement method for cambered-inward steel box arch bridge main arch rib segments

Abstract

The invention discloses a quick measurement method for cambered-inward steel box arch bridge main arch rib segments. The quick measurement method includes the steps of S1, selecting and marking each segment measure point of one steel box arch rib; S2, defining a tangent line coordinate system for measurement of the arch rib of the bridge, and by taking the center of the main bridge as the originalpoint, the mileage direction as the x axis, the upstream-downstream direction as the y axis and the elevation direction as the z axis, arranging a total station at a guide control point which can sight the steel box arch rib; S3, mounting a first segment of the steel box arch rib; S4, mounting a second segment of the steel box arch rib, to be specific, roughly positioning the second segment of the steel box arch rib through a positioning device, arranging prisms at marked portions or all measure points of the steel box arch rib, finely adjusting mounting position of the second segment of thesteel box arch rib to a certain error range so as to complete mounting of the second segment of the steel box arch rib; S5, repeating the step S4 until completing measurement and mounting of all steelbox arch ribs. With conversion of the coordinate system, speed of measurement of the main arch rib segments can be increased greatly.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a method for quickly measuring the main arch rib segment of an inwardly inclined steel box arch bridge. Background technique [0002] In the new era, the development trend of my country's bridge engineering is technological innovation and continuous change. In addition to meeting the requirements of traffic and safety, it also has higher and higher artistic requirements for bridge aesthetics. On the basis of traditional arch bridges, the continuous updating of arch structures and Changes have promoted more and more colorful bridge shapes, and there are more and more composite system arch bridges and novel special-shaped bridges. For example, the Shenzhen Qianhai No. 2 landscape bridge project is an inwardly inclined horizontal arch beam-arch composite bridge, and the Hunhe Boguan Bridge in Shenyang is a mid-supporting ribbon-shaped basket arch bridge. At present, during the ins...

AI Technical Summary

Problems solved by technology

The Guantang Bridge in Liuzhou, which is currently under construction, adopts the 80 national coordinate system, and the elevation adopts the 1985 national elevation datum. Because the arch rib of the main bridge is a catenary line, and the angle between the arch plane and the vertical plane is 10° inward, the calculation The coordinates of the measuring points are very difficult and time-consuming. Therefore, it is necessary to find a method that can quickly calculate the measuring points to speed up the measurement and fine adjustment of the main arch rib segment

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