论文部分内容阅读
最近,随着土木工程技术的发展,新奥法施工的隧洞工程、地下贮油库、地下式电站厂房、地铁工程和护坡等,对喷混凝土的需要量急剧增加;并对喷混凝土施工方法,要求提高以下各项性能:(1)喷射混凝土时回弹率小;(2)不产生剥离;(3)粉尘量少;(4)早期和后期强度较高;(5)强度变差不大;(6)在隧洞中压送距离较长;(7)工效高。为了满足以上要求,已研制出一种新喷混凝土施工方法,即水泥裹砂喷混凝土施工方法。该方法与惯用的湿式或干式喷混凝土施工方法完全不同。该方法的原理是,将喷混凝土分为砂浆和干骨料(砂、砾石)两部分,分别压送到喷咀处混合,再向受喷面喷射,其粉尘量等于或小于惯用的湿式喷混凝土施工方法,回弹率很
Recently, with the development of civil engineering technology, the tunnel construction of New Austrian law, underground storage depots, underground power station buildings, subway projects and slope protection, the demand for shotcrete increased dramatically; and spray concrete construction methods and requirements Improve the performance of the following properties: (1) small rebound rate when shotcrete; (2) no peel; (3) less dust; (4) high early and late strength; (5) (6) pressure in the tunnel to send a longer distance; (7) high efficiency. In order to meet the above requirements, a new sprayed concrete construction method has been developed, that is, the construction method of cement-wrapped shotcrete. This method is quite different from the usual wet or dry shotcrete construction methods. The principle of the method is that the shotcrete is divided into two parts of mortar and dry aggregate (sand and gravel), respectively pressure-fed to the nozzle to be mixed and sprayed on the sprayed surface. The dust amount is equal to or less than the conventional wet spray Concrete construction methods, rebound rate is very high