4. Construction of the pipe for the walla. If possible, 125mm pipes shall be constructed at the interval of 1,200 ~1,400mm in consideration of their inferences with the reinforcing bars of the wall.b. In case 125mm pipes cannot be installed, 100mm pipes may be installed at the interval of 1,000mm.c. The possibility that the pipes may interfere with beams and wall reinforcing bars shall be reviewed. If necessary, the interval can be increased. If haunch beam should be constructed over the cradle, it shall be approved by the supervisor.d. Adequate measures should be taken not to have the pipe stopped before, during and after concrete placing.
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