Supplying dam safety monitoring mandatory for the base

Special precision engineering measurements during operation, due to its accuracy requirements are particularly high when using the plumb bob in the optical or laser alignment when the error will have a significant impact on the overall error, so the use of precision instruments observations mandatory for multi-use method. ???? Precision engineering measurement methods commonly forced to have: ???? (1) in the whole observation process, the position of the instrument remain intact, so that almost no error; this method is used in the room, But for a long time does not move more difficult to keep the instrument applies only to short-term projects. ???? (2) the establishment of observation pier, observation Duntou basically like a tripod head buried in the center of the observation pier platform connecting screw, plug directly into the instrument when used, its error <± 0.2 mm; buried the best use of the central connecting screw rust brass. ???? (3) on the base of the instrument observation pier buried directly alidade or corresponding parts of the instrument is inserted using the people, their error <10.1nun; also on the base using protective devices. The main purpose of project examples ???? ???? external deformation monitoring network established to provide baseline (reference system) for various other external monitoring systems, but also to work as a stable point detection rock near the dam of the various parts of the observation stability and absolute amount of displacement of rock near the dam work basis points, for the important hydro project is very necessary. ???? External deformation monitoring network (graphic) design angle measurement accuracy ± 0.5 "edge length measurement accuracy of soil ((lmm + lppm x D), the least little bit in error soil 1.41mm, side length of reliability is not less than 0.3, the sensitivity of each point of not more than 5mm. The net total of 13 points from the average composition of the observed side length 530 m, to weaken or eliminate the impact of the error, the control points are mandatory for the device buried concrete observation pier. Examples of the base to force ???? ???? F-1A / DZ-A using the principle of the three slots positioned to provide mandatory hearts connections for a variety of theodolite, range finder, level and other measuring equipment. ?? ?? Applicable scope of work: deformation observation, landslide monitoring, precise control of net working point, displacement point and measuring point calibration with instrument installation ????: domestic and various types of theodolite rangefinder and a variety of sighting the target plate, full spy instrument ???? maximum misalignment: 0.05 mm ???? Base dimensions: 190 * 190/180 * 180 mm ???? base plate material: stainless steel ???? Connection: Three slots center insert, metric bolts, connecting Kern plant Series instruments