水利水电工程中钢筋混凝土病害与防治分析

在水利水电工程中,钢筋混凝土工程是其核心部分。文章主要分析了一些钢筋混凝土的通病的产生原因,并针对这些病害提出了相应的预防和解决措施,具有极为重要的工程意义。

浅谈水利水电混凝土施工管理

水利水电混凝土工程施工在水利水电建设事业中占有重要地位，特别是以混凝土大坝为主体的枢纽工程，各种费用约占工程总投资的50～70％。作为承包单位的施工企业要在市场经济条件下，取得最大的经济效益，企业内部的管理工作至关重要，而混凝土工程施工管理就成为重中之重。纵观整个混凝土工程施工，涉及砂石骨料制备、混凝土拌和、混凝土运输、钢筋模板、浇筑仓面作业、温度控制和接缝灌浆等诸多环节。在各环节施工中加强计划、技术、质量、成本四方面的管理对企业提高经营管理水平、增加经济效益，保证工程质量、降低造价、缩短建设周期具有举足轻重的作用。在实际施工过程中，经常存在着计划安排不合理，技术水平不高，质量、成本控制不严格等现象，为了避免和减少这些不合理现象的发生，就要加强各环节的管理，合理安排计划，严格控制质量和成本，提高施工技术水平。

Study on the propagation of interface crack of young concrete lining and rock under blasting load

In the construction of water conservancy and hydropower project,young concrete lining structure is often affected by blasting load. Young concrete has a lot of micro-fractures with random distribution,which are easier to propagate and connect under blasting load. This paper focuses on the calculation on dynamic stress intensity factors of bond interface crack of concrete-rock according to concrete age. Result shows that different incidence angles of stress wave lead to different crack propagation mechanisms. Under the normal incidence of impact load,the bonding interface crack propagation of the concrete lining is mainly caused by reflection tensile stress,which forms from the free surface. With horizontal incidence of stress wave,the bond interface crack propagation of concrete lining is affected by concrete age. With the increase of concrete age,the elasticity modulus margin between concrete and rock decreases gradually,and the crack propagation form changes from shear failure to tensile damage.