UPVC construction methods are there?

(1) the slotted pipe: pipe base gravel, gravel size to 25-38mm.

(2) pipe tired line laying, required the use of flexible joint line laying, pipes each undertake a relative angle generally shall not be greater than 3 degrees.

(3) the pipe and the inspection well connected by a short pipe connections, pipe socket should be placed in the manhole inlet direction, Jack should let in the water of the well.

(4) trench backfill from the bottom base parts began to pipe more than 0.3 meter range with coarse sand backfill and levelling, compacting, the rest by Tang ballast backfill, pipe backfill compaction standard for light 83%, heavy duty standard for 90% subgrade degree of compaction.

(5) trench backfill from the bottom base parts began to pipe more than 0.7 meters must be filled manually, no mechanical moving backfill: tube top 0.7 meters above

Backfill, machinery can be used from both sides of the pipe axis at the same time filling, tamping or RCC.

(6) under the roadway, it tube top casing height of not less than 0.6 m.

(7) rubber ring for pipe joint and its performance should be consistent with: hardness 50 ± 5MPa, elongation ≥ 50%, tensile strength ≥ 16MPa, permanent deformation is less than 20%, ring stiffness ≥ 8KN/square meters, impact strength TIR ≤ 10%.