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四川省水电勘测设计院测量队通过长期的大坝变形观测实践,吸取百家之长,经过反复设计、试验,制成通用式强制对中基座。该基座经过七个单位的使用,效果较好。主要技术指标如下:1.三槽的交点与中心插孔的同心误差不超过0.15毫米;2.对中基座圆台平面部位的平整误差小于0.1毫米;3.三槽交点与中心插入孔和螺孔同心总对中误差不超过0.2毫米,当观测边长100～1500米的三角网时,测角误差在0.″03～0.″45以下,满足一等或二等三角网的精度要求。
Sichuan Hydropower Survey and Design Institute measurement team through long-term dam deformation observation practice, learn from the 100, after repeated design and testing, made universal mandatory base. The base through the use of seven units, the effect is better. The main technical indicators are as follows: 1. The intersection of three slots and the center of the jack concentricity error does not exceed 0.15 mm; 2 on the base of the flat table flat parts of the flatness error of less than 0.1 mm; Hole concentricity of the total error is not more than 0.2 mm, when the observation side of the triangle 100 ~ 1500 meters, the angular error of 0. 03 ~ 0 45 below to meet the first-class or second-class triangulation accuracy requirements .