【Daily Question】Utilities - Mechanical & Electrical - 20191208

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The key points of supervision for the construction of underground pipelines for automatic control instruments in light industry construction projects include ( ).    A. The supervisor must have the measurement results regarding the planar position, elevation, slope, etc., of the underground pipelines. B. It is necessary to check whether the underground pipelines are laid on undisturbed solid soil or on soft soil that requires compaction as specified in the design; any disturbed soil must be treated accordingly. C. The cross-section of the trench in which the pipes are buried must comply with construction standards; the bottom of the trench should be compacted and level, and its slope must meet the required specifications. Holes for the pipes must be prepared in advance where they pass through building foundations. D. After the installation of the underground pipes is complete, strength and tightness tests must be conducted. Only after these tests are successful can anti-corrosion treatment be applied, and the area can be backfilled after passing the inspection for concealment. E. It is necessary to verify that the qualifications of the construction management personnel meet the required standards. Answer: ABCD