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Steel-mixed equipment foundation directly buried bolts. A successful construction of new technology requires a deviation of less than 2mm.
The main inclined shaft wellhead of the Gaolan Mine in the Gujiao Mine Area of ​​Shanxi Province, frame structure, independent foundation, 4 floors, construction area of ​​1400m2, volume of 1300m3, plane axis size of 18mx35m, height of 21.6m, a large equipment foundation, concrete strength grade C25, The volume is 20m3, which is the basis of the belt drive device of the main inclined shaft. The base height is -4.2m, sitting on the sand pebble layer, and the height of the bolt of the pre-embedded equipment is 73.4m on the ground.
According to the design requirements of the drawings, the leather bandwidth is 1 200mm, the design tension is 1208, the driving device includes the head roller, the driving roller, the funnel, etc.) The bolts include the M56 9 buried method, and the construction scheme of the secondary pouring concrete for the reserved holes is not allowed.
In response to the above situation, we conducted several research discussions. If the method of bolting alone is used, the design requirements cannot be met. If the steel is used for reinforcement, not only the bolt displacement will occur during the welding process, but also the overall displacement of the steel frame during the concrete pouring process, it is difficult to ensure the quality of the bolt. It may also cause a quality accident. After many arguments, the construction plan was finally determined as follows: the basic earthwork excavation, firstly construct the frame independent foundation and frame column to: 0.00, partially backfill the earthwork, then pour the foundation of the equipment, and add the retarder to the equipment foundation concrete. Implement a two-shift system for day and night construction. In order to reduce the heat of hydration, the slag Portland cement is used, and the concrete equipment foundation is applied to 71.6m at a time, that is, the bottom of the bolt is 20;m. In order to ensure that the construction joints are firmly combined, set the steel bars! 251000 two-way arrangement, buried in the concrete 50; m, leaving 50; m in the upper part, and pre-cut iron parts.
Vertical channel steel = 12 brackets, and channel steel. Beijing: China Building Industry Press, 1992, editor of Tongji University. Water treatment. Beijing: China Building Industry Press, 1998
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