What is Construction Control Survey, Building Construction Survey Control Network?

The survey control network is composed of many survey control points according to certain technical requirements, and the net size of the plane coordinates or elevation of the points is obtained.

Classical measurement control networks can be roughly divided into three types: plane control networks, elevation control networks and gravity control networks.

1. The plane control network is to form a network of geodetic control points in a certain form of graphics, and determine the coordinates of the network points, or calculate the coordinates of the network points by measuring the angle, side length and azimuth angle in the network.

2. The elevation control network is composed of leveling routes that connect each elevation control point. By leveling, the height difference between adjacent leveling points can be found. In order to calculate the elevation of each leveling point, it is necessary to select a certain elevation starting point, such as the leveling origin; It is also necessary to specify the elevation starting surface, such as the geoid level.

3. The gravity control network is a network composed of absolute gravity points and relative gravity points, which is the realization of a national gravity benchmark. The observations of the plane control network and the elevation control network are related to the earth's gravity field, especially the relationship between the elevation control network and the gravity bench is more close. Therefore, gravity measurement is also an important part of the establishment of plane and elevation control networks.

The construction survey and control network is a survey (mainly referring to coordinates) control network laid out for the construction of the project.

The layout of the construction control network should be considered according to the general layout of the building (structure) and the topographical conditions of the construction area. For mountainous areas with large undulating terrain and areas that cross rivers, the establishment of a triangulation network or GPS network can generally be considered. For areas where the terrain is flat but the visibility is difficult, such as residential areas and industrial sites that have been reconstructed or expanded, you can consider laying a wire network.

For industrial and civil construction areas with dense buildings and regular layouts, the construction control network can also be laid into a regular rectangular grid, that is, the building grid this sail.

3. All construction control measurements include the coordinate system design and precision design of the construction control network, the laying of the construction control network, the burial or construction of the marker stone or observation pier of the control point, the observation and adjustment calculation of the control network, and the regular retest of the control network.

The construction control survey is the measurement of the construction control network, and the control range is small and the density of control points is large.

Construction control surveys are divided into plane control surveys and elevation control surveys.

The task of building construction control measurement is to establish a construction control network. The control network established in the survey stage, because the design position of various buildings has not yet been determined, can not consider the requirements of construction, and the distribution, density and accuracy of control points are difficult to meet the requirements of construction survey. In addition, due to site leveling and earthwork filling, most of the control points were destroyed.

Therefore, before construction, the construction control network should be re-established.

Most of the industrial plants, civil buildings, roads, etc. are laid in parallel or perpendicular directions to each other, therefore, in the new construction.

On large and medium-sized building construction sites, the construction control network is generally laid out into a square or rectangular grid, which is called.

Building a grid (or rectangular grid).For the design of buildings that are not very complex in an area of small size, one or several baselines are often laid parallel to the axis of the main building as the plane control of the construction survey, which is called.

Building baseline. There are also laying wires as a plane control network for building construction.

The task of building construction control measurement is to establish a construction control network. The control network established in the survey stage, because the design position of various buildings has not yet been determined, can not consider the requirements of construction, and the distribution, density and fine mu branch ratio of control points are difficult to meet the requirements of construction survey. In addition, due to site leveling and earthwork filling, most of the control points were destroyed.

Therefore, before construction, the construction control network should be re-established.

Most of the industrial plants, civil buildings, roads, etc. are laid along the parallel or perpendicular direction to each other, therefore, on the new large and medium-sized building construction site, the construction control network is generally laid out into a square or a rectangular grid composition, which is called the building square grid (or rectangular grid). For the design of buildings that are not very complex in area, one or more baselines are often laid parallel to the axis of the main building as the plane control of construction surveying, which is called building baseline. There are also laying wires as a plane control network for building construction.