What are the causes of water seepage caused by plugging of municipal drainage pipes?
1. The main factor causing the appearance of water seepage is the application of pipes with cracks in quality, unqualified impermeability and poor compression resistance in municipal drainage pipeline projects. In order to ensure that the project quality is qualified, the quality of the pipes should be thoroughly checked before the preliminary project to ensure that the substandard data are checked out. In addition, the relevant person in charge of the municipal drainage pipeline should go to the standard manufacturers with good wishes to purchase pipes, and check whether the pipes meet the factory certificate and other corresponding mechanical experiment requirements. In the end, the appearance inspection of the pipes should be stopped in the construction line, and pay attention to whether the pipes appear to be peeling, exposed, damaged, cracked, honeycombed, etc. Once relevant appearances are found, other qualified pipes shall be exchanged immediately.
2. Control the quality during trench excavation. As for the determination of the excavation period, we should give full consideration to the project quality and production safety to ensure a scientific and reasonable grooving section. The grooving section is bound by various factors such as the bottom of the groove, the width of the groove bottom, the slope of each layer, and the width and depth of the reserved platform between layers. The stop of grooving section not only needs to consider whether the subgrade slag layer and asphalt outer surface layer should be excavated by excavator during the process of engineering excavation. In addition, after the excavation reaches a certain distance, the height of the trench bottom should be carefully measured and controlled. It is particularly worth noting that the upper part of the trench bottom should not be over excavated. Once the situation of over excavation appears, the over excavation should be tamped and backfilled steadily. At the same time, the appearance of ponding in the low-lying area at the bottom of the trough is completely present, preventing the use of silt, humus and waste soil that do not meet the standards to tamp and fill the low-lying ponding at the bottom of the trough. In addition, the excavation of trench bottom should also ensure the safety of construction and the smoothness of subgrade, as well as the scientific and reasonable slope making and ensure the economic rationality.
3. Quality control of flat base pipe socket construction. Once the trench excavation inspection is qualified, we can contact the drawing scheme for preliminary construction on the pipe foundation. Assuming that the trench presents the appearance of sludge and ponding, the first battle is to thoroughly clean the trench, clean the sludge in the trench, and lay the sand cushion together, so as to lay the foundation for the smooth stop of dry trench construction. Assuming that there is an open water meter in the tank, we should stop the useful drainage, and the height and thickness of the flat foundation should be strictly controlled. If the erection of concrete and formwork is poured before leveling the foundation, the elevation of formwork snapping line and groove bottom should be further reviewed to ensure that all are correct, so that the concrete can be poured, and then the pipe socket can be ensured. In addition, we need to recheck the rigidity, stability and strength of the pipe socket formwork, and then ensure that the slack soil layer is not directly affected by the supporting point effect of the strut. In order to avoid the formwork being able to accept the concrete pouring and vibrating gravity and lateral thrust, and avoid the appearance of formwork shifting, we can add backing plates or allow piles to achieve the defensive effect.