1, after the release of the tube found the appearance of defects as long as the GB/T11836 - 1999 to allow the scope of repair, should take effective and feasible method to repair. Repair materials should be close to the color of concrete, the bonding strength is not lower than the strength of the tube concrete, its compressive strength is not less than the compressive strength of the pipe concrete.

2, post curing, the temperature at 10 degrees Celsius above the pipe should be put in the field of water maintenance.

3, the maintenance of good cement pipe production of cement pipe in accordance with the provisions of the GB/T11836 - 1999 stacked pile up to the designated area.