Ductile nodular cast
iron pipe and steel pipe interface conversion ever tube and steel tube connection there are two ways: (
The mechanical interface under 12 parts are connected;
With steel double set of connection, the interface form for oil hemp expansive cement interface (
Less commonly used in more than 12, 12 the following)
In construction process we found that if use mechanical interface forms, frequently, accessories in the area of high pressure wash away by water leakage;
If use oil hemp expansive cement interface, on the one hand, the intensity of labor is larger, cement interface for the rigid interface at the same time, on the basis of the groove is poorer, backfill quality is a bit poor and imposed load under the condition of large broken frequently, interface, and the cement interface also extend the time limit for a project accordingly.
Aimed at this situation, we summed up the research and experiments a more practical method --
Steel standard pipe conversion method.
The production of the same diameter and the bulb socket diameter steel tube standard, the standard pipe welding on the coil plate steel pipe, and then insert the standard pipe steel ball GuanCheng mouth for installation.
If it's bulb socket into the steel tube, a double set of ductile iron are increased in place, and then transformed using standard pipe.
This not only reduces the labor intensity, speed up the construction progress, also increase the possibility of a pressure test a success and the safety and reliability of the water supply.
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