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大型地下厂房岩壁吊车梁的防裂技术一直是困扰地下洞室的施工难题,因为以往的岩壁吊车梁在结构衬砌后,表面普遍存在贯穿性裂缝。彭水水电站地下厂房预应力岩壁吊车梁布置在薄层、陡倾角、软弱岩层中,边墙自稳定性差、开挖卸荷、不均匀沉陷对岩壁梁的结构安全十分不利。在应用传统施工经验的基础上,对岩壁梁结构衬砌与预应力锚固时机、梁体下部薄层开挖随层支护等施工技术进行了系统研究,成功地解决了因开挖卸荷、不均匀变形导致岩壁梁混凝土产生裂缝的施工难题。彭水水电站地下厂房的岩壁吊车梁于2005年3月完工,2006年4月投入使用,经受住了荷载试验及施工期的机组安装等大件吊装的考验,通过近5a实践,梁体结构尚未发现有裂缝。成功地实践了无裂缝预应力岩壁吊车梁施工技术。
The crack prevention technology of the rockfill crane beam in the large-scale underground powerhouse has been a difficult construction problem for underground caverns, because the former rockfill crane beam has penetrating cracks on the surface after the structure lining. The prestressed rock-wall crane girder of Pengshui hydropower station is arranged in thin layers, steeply inclined and weak rock strata. The self-stability of the side wall, excavation unloading and uneven subsidence are very unfavorable to the structural safety of the rock wall beam. Based on the application of traditional construction experience, the construction technology of rock wall beam lining and prestressed anchorage, the thin layer excavation of the lower part of the beam body with layer support and other construction techniques are systematically studied, Construction Difficulties Caused by Inhomogeneous Deformation of Rock Wall Beam Concrete. The rock-walled crane beam of the Pengshui hydropower station underground plant was completed in March 2005 and was put into operation in April 2006. It has withstood the test of large-scale hoisting such as the load test and the installation of generating units during construction. Through nearly 5 years of practice, the beam structure No cracks found yet Successful practice of crack-free prestressed rock-wall crane beam construction technology.