Dujiangyan Irrigation Project observation post, bridge concealed observation pile, delivered nationwide

Description :

　　Dujiangyan Irrigation Project observation post, bridge concealed observation pile, delivered nationwide

　　The importance of stable observation points has been explained in the previous text. Traditional "L" shaped observation points are often damaged or stained by falling building materials from above. The new observation point adopts the method of separating embedded parts and observation points (see the figure below), consisting of embedded sleeves, bolts, and plugs. The interior of the embedded sleeve is set as a hollow cylinder, and the inner wall is set with threading. Pre embedded parts are installed in the walls and columns of buildings at settlement observation points; The ends of the bolts and plugs are equipped with threaded sleeves that are compatible with the embedded sleeves. When laying out the points, embed the embedded parts into the concrete, tighten the external parts during observation, and remove them after observation. This can reduce the occurrence of observation errors to a certain extent.

　　The benchmark should be selected in a stable location outside the influence range of settlement deformation for long-term preservation. The benchmark should be buried according to the required specifications, or a wall benchmark can be set up on a stable building, structure, or foundation. The distance between the settlement reference point and the observation point should not be too far to ensure sufficient observation accuracy. The burial diagram of benchmark markers is as follows:

　　Work base point: When the distance between the reference point and the measured building is too far to facilitate settlement observation operations, it is advisable to further increase the number of benchmark points or set up work base points to meet the needs of settlement monitoring. The points should be buried in a stable area and remain stable during the observation period. When measuring settlement deformation points, they should be used as elevation transfer points. Ordinary leveling markers or wall benchmarks can be buried in the concrete diagram. The burial specifications are as follows:

　　From the above comparison, we can easily see that the street lights next to us are much more stable than the benchmark and working benchmark. You can think about it this way. There is also a tall street light standing on the base of the street light. If the base is not sturdy, the street light would have flown into the sky long ago. Isn't that surprising? You don't have to worry about the benchmark anymore.

　　The benchmark also needs to meet one condition, which is stability, so we look for streetlights that have been built for more than a year, which is very stable. If measuring the settlement observation of buildings within the community, choose the street lamps on the roads outside the community.

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• Dujiangyan Irrigation Project observation mark