First, pour the bottom foundation of the first layer of observation pier, and then determine the height of the observation pier according to the design requirements, in order to meet the design requirements, practical observation, and convenient use.
The pouring of commonly used observation piers should first be done by making wooden molds.
The inner diameter, size, and shape of the wooden molds vary with engineering or design requirements (in recent years, many places have used 200mm PVC pipes as observation pier molds).
Regardless of the mold used, the upper 10cm must be disconnected for vertical adjustment and staged pouring.
Secondly, the top plane size of the observation pier should be 3-4cm larger than the base size in order to facilitate the pouring of the second phase concrete.
The wooden formwork should be tightly fastened with Ø 16 steel bars or flat steel hoops around it to prevent deformation during pouring.
A centerline should be drawn around the wooden formwork for alignment.
To ensure the verticality of the observation pier, a theodolite, level, and plumb bob should be used for alignment during pouring.
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