When installing nodular cast iron covers, the correct method and steps should be mastered. So, when we install, what aspects should we pay attention to? This is a question that we are going to introduce to you today. Now let's get to know it.
If the installation of nodular cast iron well cover adopts mechanical interface form, parts will often be washed away by water and leak in areas with high pressure; if oil flax expansion cement interface is used, on the one hand, labor intensity is relatively high, while cement interface is rigid interface, joint damage often occurs when groove foundation is poor, backfilling quality is slightly poor and external load is large, and on the other hand, joint damage often occurs when groove foundation is poor, backfilling quality is slightly poor and external load is large。 The use of cement interface also extended the construction period accordingly。
In the installation of cast iron covers, the manufacturers often have curved pipe laying, but the radian is not very large. At this time, the straight-line pipe pulling and other pipes should be installed before bending. In the installation process, the outside of the arc should be stabilized by small wood to avoid displacement.
Cast iron well covers are connected by mechanical interface fittings, steel double sets and oil flax expansive cement interface. Some problems will occur during the installation of cast iron well covers. The covers manufacturer manufactures steel standard pipes with the same external diameter as the spherical pipe socket. The standard pipes are welded on the coiled sheet steel pipe, and then the steel standard pipes are inserted into the spherical pipe socket for installation. If the socket of the spherical pipe is connected with the steel pipe, a double set of ductile iron is added at the junction, and then the standard pipe is used for conversion.
In order to prevent the cast iron well cover from being eroded underground and prolong the service life of the pipeline network, the outer surface of the cast iron well cover should be coated with asphalt paint, and then packed into storage. In order to further enhance the corrosion resistance of cast iron manhole covers, the manufacturers of cast iron manhole covers need to spray zinc on the outer surface of nodular cast iron manhole covers.
Above all, we introduce several basic steps for installation of nodular cast iron manhole covers. It is very important to pay attention to these problems. I hope that the above introduction can give you some hints and help.