Method for measuring power transmission cable tunnel axis through multistage control network

Abstract

The invention relates to a method for measuring a power transmission cable tunnel axis through a multistage control network. The method comprises the following steps: performing the primary control network measurement and the plane contact measurement in order, wherein the primary control network measurement comprises performing coordinate collection and computation on a ground coordinate control point through a GPS system to acquire a coordinate of an underground wire coordinate control point; performing the elevation control network measurement and the elevation contact measurement in order to acquire the elevation of an underground wire elevation control point; combining the coordinate of the underground wire coordinate control point with the elevation of the underground wire elevation control point, and then laying the wire control points in the tunnel; and determining the cable tunnel axis. Compared with the prior art, the method disclosed by the invention has the advantages of being small in total scheme measurement error, high in wire coordinate measurement accuracy and small in influence of external environment on the measurement.

Description

technical field [0001] The invention relates to the measurement of the axis of a power cable tunnel, in particular to a method for measuring the axis of a power transmission cable tunnel by a multilevel control network. Background technique [0002] With the large-scale application of transmission cables in urban power grids in recent years, the proportion of cables in Shanghai's power grid has surpassed the traditional overhead line transmission method, and has become the main force of Shanghai's power transmission. At present, cables with a voltage level of 110kV and above in Shanghai are mainly laid by pipes and tunnels. Tunnel laying is more and more widely used in cities because it can accommodate a large number of cables and is easy to lay, repair and replace cables. However, the cable tunnel will be bent due to the surrounding environment, or the horizontal height will change, so it is impossible to determine the exact position of the tunnel through the adjacent wells...

AI Technical Summary

Problems solved by technology

However, the cable tunnel will be bent due to the surrounding environment, or the horizontal height will change, so it is impossible to determine the exact position of the tunnel through the adjacent wells, which will bring difficulties to the surveying and mapping work; and because the GPS signal cannot be received in the tunnel, only the known position can be used. Unknown measurement points are measured one by one, resulting in the superposition of errors, and the measurement error is getting bigger and bigger. Due to the limitation of conditions, the previous measurement methods actually rely on the completion data and design data of the construction party. Therefore, the measurement work of the cable tunnel is due to the measurement The continuous superposition of errors often exceeds the allowable error

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