螺栓预留孔（Bolt hole）.doc

螺栓预留孔（Bolt hole） In the metallurgical construction, plane geometry size of hot rolling basis, continuous casting machine and other large equipment foundation base is relatively large, the size of the short length of ten meters, hundreds of meters long, based on complex shape, base top surface elevation are embedded anchor bolts, pre buried sleeve and the reserved bolt number can be up to more than 100 or even thousands, which accounted for a large proportion of reserved bolt holes, which are staggered in different elevation position, construction precision is very high, the construction is very difficult. 1. Analysis of the traditional methods of retaining bolt holes For a long time, we in the construction of equipment foundation has been set up by the wooden preformed hole, with the development of society, the traditional method of reserving bolt hole have been unable to meet the needs of metallurgical engineering construction of large equipment foundation. Based on large-scale metallurgical equipment mill foundation, based on the 1.1 hot strip continuous casting machine, a large concrete construction, often appear in the reserved hole wood factory mold by extrusion deformation or swelling deformation, and after concrete pouring out timely and open not out. Finally, only pick out the wood drill will be broken, on the spot, especially some large depth of the reserved hole stripping more difficult, time is also larger. 1.2 some construction units in order to pull out reserved hole template, tend to be made under the reserved hole template, a small mouth, the upper surface is very smooth wedge hole template, this template after concrete pouring out concrete template, the surface is very smooth, and the small, the two bond performance of concrete and foundation concrete is very poor, and the fine stone concrete grouting two times water shrinkage. During the operation of the equipment, the anchor bolt is easy to be extracted by the one or two grouting and the concrete i