1. Cast-in-place technology 500-550 yuan or so. The construction contents are probably: manufacturing, assembly, erection, disassembly, repair, maintenance, transportation, storage, stacking, application of release agent (including the cost of release agent raw materials) and installation of internal and external formwork systems. Procurement, unloading, laying, processing and transshipment of square timber from support to box girder bottom formwork; Manufacture of anchor pad and saw-tooth template, and manufacture, installation and removal of all small steel structures and wooden models; Manually cooperate with preloading; Concrete pouring, tamping, surface closing, curing, roughening, trimming, mending and sealing; Manufacture, installation and material transfer of various embedded parts and ironware (including materials of drainage pipes, exhaust holes and other pipelines); Installation and disassembly of upper and lower bridge steps and lighting frames, reserved manholes, roughening of tensioning notches, straightening and restoring reinforcement and sealing ends; Manual and mechanical water bag preloading (individual parts are jack-up steel preloading, etc.). ) and all other matters.