1, ductile pipe
is not necessary to special selected backfill earth.
But the part of the direct contact with the tube is the best choose sand or fine soil or sand of digging groove used for backfilling, the economy;
2, in the case of soft soil, it is better to sand backfill back to the center of the pipe diameter, and has a good effect.
It is important to note that don't have installed tube produce sink;
3, groundwater will try to do, to avoid jaasiel blisters bogs, caused that the foundations of the softening of southern region construction is very important;
4, should be equal attention to both sides of the ductile pipe sand filling soil, the bottom of the tube should be fully surrounded by soil sand filling;
5, if the new connection pipe is not fully charged or backfill, the ditch water may make it floating.
Ditch water may be groundwater or rain 6, ductile pipe in the course of carriage, due to loading and unloading method, may cause the pipe socket ellipse, below DN400 tube elliptical part can be cut off, use special tools to the whole garden is larger than 500 mm, and then the field of concrete lining repair, cement mortar ingredients (
Is as follows: 2 3 2 copy of sand, cement, drinking water, 1 additives, fully mixing, cleaning up before repair to revamp float sand and sundry, then the water will be around here soaking;
Be careful not to water, repair surface to smooth, covers the keeping in good health;
Under 7, the first tube groove by the tube socket centerline positioning toward in the direction of flow, according to the elevation of each tube inserted before after a GuanCheng mouth, tubular observe whether jack line is in place, reduce through the gaps in a tube to observe the interface, the minimum clearance shall be not less than 3 to 5 mm, starting from the second branch pipe installed along the pipe shaft axial direction on each side was a 2 t -
8 t taut leading chain, to ensure uniform interface gap, but also can solve meets the design for the slope downwards shift problem.
Install straight segment does not allow the up and down or so with Angle, as a result of terrain must deflection Angle, DN1400mm can corner 1 below.
More than 5 ~ 3 degrees, DN1600mm borrow the biggest Angle should not exceed 1 ball.
8, the pipeline installation in the serpentine state cannot, if there is a requirement construction adjustment, to keep the line straight state;
9, aprons to store a cool airtight place;
10, pipeline sand cushion to level off, are not allowed to have a larger local projection has been shipped to pursue good tubes to check whether there is dangling pipe phenomenon;
11, should check whether the pipe is shift when backfill, including up and down and around;
12, the requirement of backfill soil: the center line of the pipeline under every rise 200 mm distance to consolidate, soil compaction density is greater than 90%, the center line of the pipeline more than once every 500 mm higher distance to consolidate, soil compaction density is greater than 85%, to someone who's in charge of backfill and supervision;
13, in case of special requirements, you can set aside the interface part, and play an intermediate to fully backfill to avoid pipe tube body in the process of floating and integral pressure testing mobile;
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