市政工程质量通病及防治（Common problems and prevention of municipal engineering quality）.docVIP

市政工程质量通病及防治（Common problems and prevention of municipal engineering quality） Common problems and prevention of municipal engineering quality drainage section Municipal road drainage system is one of the important facilities for the normal use of municipal facilities. It is very important to ensure its construction quality. The common quality defects of municipal drainage pipe project construction quality are divided into four aspects, the causes are analyzed, and the prevention measures are put forward. I. deviation of pipe position or water accumulation (1) causes: Measurement errors, construction aliasing and unexpected avoidance of the original structure, in the plane on the location of displacement, elevation on the surface of the water, or even slope phenomenon. (two) preventive measures: 1., measures to prevent the measurement and construction are as follows: (1) before construction, according to the construction survey specifications and procedures for handover pile re test and protection. (2) the construction lofting according to hydrogeological conditions, according to the buried depth and the design requirements and the relevant provisions setting out, and must meet the requirements of the test retest error to the delivery of construction; (3) construction should be carried out in strict accordance with the kind of pile base to make peace trench axis and longitudinal slope measurement acceptance. 2. during construction, when the building must be avoided, the connecting well shall be added at the proper place, and the connection angle shall be greater than 135 degrees. Two, pipe seepage, closed water test failed (1) causes Water leakage can be caused by uneven foundation sinking, poor quality of pipe and its interface construction, incomplete plugging of end of closed section and poor quality of well construction. (two) prevention and control measures 1., the poor foundation of the pipeline will lead to uneven settlement of the pipeline and the foundation