culvert construction matters needing attention:

　　1, before culvert construction, prepare related materials, equipment and personnel to enter, work safety protection and well construction period, subgrade slope protection , prevent objects such as stones fell hurt.

　　2, foundation treatment, can be backfilled gravel or laying concrete. To smooth the basement, replacement of 30-50cm thick gravel material, density reached above 90%, the choice of appropriate water about 3% longitudinal slope. Set each culvert centerline and sideline.

　　3, steel corrugated culvert construction, using the method of segmental construction, advance in the original Arch Culvert Base with angle steel side by side, according to the length of culvert length determination. As the rail steel culvert propulsion, corrugated culvert pipe diameter can have different specifications according to the need of engineering, self-contained tube diameter is 0.5m--2.5m; each pipe length of 3 meters. Using internal (external) flange bolt connection. Assembled culvert pipe diameter 3m--8m. The circumferential direction of each 4---15 block plate, plate with high strength bolts fastening plate.

　　4, if the culvert length less than 30 meters, on both sides of corrugated metal culvert and the original culvert width is greater than 80cm, can be the whole corrugated metal culvert propulsion, to end in the downstream or upstream in place later, then end of masonry retaining wall, surrounded by backfilling work, can the backfill gravel, gravel soil, masonry rubble, top with mortar rubble or high pressure pump expansive cement mortar.

　　5, if the culvert length greater than 30 meters, the steel corrugated pipe culvert sides with the original culvert width is less than 80cm, 3m-6m can be long culvert propulsion, to end in the downstream or upstream in place, can be fixed, piece of stone masonry top end wall, spacing and the other end of the steel corrugated pipe culvert culvert between with sandbags or mortar rubble blocked, width of 50cm, and then start the backfill. Both sides can be used coarse watertight compaction or pouring concrete vibrators tamping; top with high pressure pump expansive cement mortar. After finished the section tube around the filling, the second sections of pipe are connected to, two tube, connection mode for corrugated pipe culvert in the steel flange bolts, workers can be connected in a pipe. The connection is completed, with the method of the same backfill. In this order, complete the whole metal corrugated culvert construction work.