A Measuring Method for Establishing Dynamic Datum Plane

Abstract

The invention discloses a measurement method for establishing a dynamic reference plane. The measurement method comprises the following specific steps: S1, establishing a reference system by taking a central point O1 as a center, wherein the reference system comprises four axis points on a first dynamic platform and reference point markers on the axis points; the four axis points are positioned on a same rhombus; the central point of the rhombus is overlapped with the central point O1; S2, placing a level gage at the central point O1, and adjusting a three-foot base of the level gage; S3, setting a scale plate upright, observing and reading the four reference point markers by using the level gage, and adjusting the heights of the four reference point markers to be equal to reading of the level gage so as to obtain a primary reference plane; S4, placing a measurement instrument at O1, adjusting the three-foot base of the measurement instrument according to the method of S2, observing and reading the reference points, adjusting the height of the three-foot base till an orthogonal position of the vertical shaft of the measurement instrument and the primary reference plane, and establishing a plane through which a collimation axis of a telescope passes when the measurement instrument is rotated for one circle around the vertical shaft and which is parallel to the primary reference plane, to be a first dynamic reference plane.

Description

technical field [0001] The invention relates to the technical field of water engineering construction, in particular to a measurement method for establishing a dynamic reference plane. Background technique [0002] In the dynamic environment of rivers, lakes and seawater, the construction of large-scale steel caissons and other high-rise structures such as assembly and installation measurement, large-scale subsea tunnel immersed pipe joint measurement tower water calibration and large steel cable tower water hoisting and positioning are carried out as follows: 1) sinking The well foundation is a common type in the deep water foundation of bridges. The construction technology is mostly steel caisson structure for the lower part and reinforced concrete caisson structure for the upper part. Due to the large size and heavy weight of the entire steel caisson, it is inconvenient to transport as a whole. After the section is processed in blocks, it is transported to the bridge site...

AI Technical Summary

Problems solved by technology

However, since the construction operation platform cannot be completely static, the accuracy of this method depends largely on the experience of the instrument operator, and there is an obvious approximation. Usually, only a dynamic datum plane approximately parallel to the platform datum plane can be obtained, and Repeated approaching is required, and the work efficiency is low

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