(1) When the full-house support construction scheme is adopted, the mud pit in the support must be thoroughly cleaned and replaced; The original ground was treated by weeding, foundation penetration test, backfill gravel soil and layered rolling, which was more than 30cm higher than the original ground. Finally, a 20cm thick cement stabilized soil cushion is laid on it. And around the excavation drainage ditch, covered with plastic sheeting, to prevent rain erosion.
(2) When the temporary pier support construction scheme is adopted, the foundation will be compacted by layers after sounding and rolling, and the backfill gravel soil will be 30 ~ 50 cm higher than the surface. According to the span of the temporary pier support, the setting-out is measured in the bridge span, the center line of the temporary pier span is not more than 8.5m, and the reinforced concrete pier column foundation of 12 * 3 * 1m C25 is cast by formwork, and the steel structure plate is embedded. Used for temporary pier connection.
(3) After the temporary pier foundation is poured, ordinary cohesive soil with a width of not less than 3.5m should be backfilled around it for compaction, and drainage ditches should be excavated around it, and plastic sheets should be laid to prevent the rain from washing away.
(4) Before the construction of cast-in-place beam with support, the site should be leveled at the construction site, and the site for erection of support should be reinforced to ensure that the bearing capacity of foundation meets the requirements of full load, and no settlement will occur after concrete pouring of beam body.
⑤ Support foundation treatment can adopt replacement compaction (compaction degree is greater than 96%), mortar masonry or pouring concrete to expand the foundation (strip foundation). Its section size should be determined according to the construction load and foundation conditions, and the top surface of strip foundation should not be less than 20CM. When pouring concrete, attention should be paid to the correct installation of supporting and connecting embedded parts.
6. If sleepers, planks or steel foundations are used, the specifications of sleepers, planks or steel foundations shall be determined according to factors such as construction load and foundation conditions, but their width shall not be less than 20CM. Before putting in place, a layer of fine sand should be sprayed on the top of the foundation to make it closely fit with the foundation. When there are gaps at the vertical and horizontal intersections, they should be filled with thin steel plates or wooden boards without leaving gaps.
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