Plan of plane measurement control network establishment

First, the head control network

1The general survey control network submitted by the urban surveying and mapping department or unit cannot be directly used as the primary plane control network. The control network must be encrypted or auxiliary measures can be used.

2The primary control network is set outside the construction site, which is used to provide a benchmark for the recovery of the lower control network which is more likely to be damaged. At the same time, the control points in the primary control network can be directly referenced to measure the important or critical measurement process. Based on the urban network, it should be set in a stable place on one side of the road outside the project site, and it should be considered to be convenient to use.

3In this project, the primary network is set in the form of a closed network around the construction site. The location of the distribution point is determined by the surveying personnel after field survey, and the data is closed and differentiated after field survey.

Two, two level control network

1The secondary control network is arranged in the relatively reliable place within the construction site, which is mainly used for the measurement of pile foundation construction stage and has the nature of short-term use. The use of the control network should be adjusted at any time according to the settlement and deformation of the construction stage. Because the working conditions of the project vary greatly, and the secondary control network is arranged inside the site, it is easy to be damaged by construction, and the location of the network needs to be adjusted according to the construction situation. The network is based on the superior control network.

2According to the different construction objects, the secondary control network is arranged in the corresponding position on the site. Therefore, the location of the network can be used to construct the area such as road.

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