Surveying and setting out refers to the process in which surveyors use special instruments to determine the centerline position of pipeline installation along the line and draw the boundaries of the construction operation zone based on the line plan, longitudinal section, line control piles and other design data. This work is not only a check of the design documents, but also the first work of on-site construction. Through surveying and setting out, we can gain a detailed understanding of the topography, topography, geology, buildings, obstacles and traffic conditions along the pipeline, providing first-hand information for project construction.
This work involves using construction equipment such as bulldozers to level the working zone and remove obstacles such as trees in the working zone to facilitate the excavation of pipe trenches, temporary stacking of soil, and welding of pipelines. According to the "Code for Construction and Acceptance of Oil and Gas Pipeline Line Engineering", the width of the pipeline construction operation zone is generally 20 meters. When the pipeline crosses or crosses rivers, ditches, roads, railways, there is abundant groundwater and the trench is dug deeper than 5 meters, it can be The width of the working belt can be appropriately increased according to actual needs. For non-mechanized construction areas in mountainous areas, the width of the working belt can be appropriately reduced according to terrain conditions.
