Study On Techniques Of Supporting System Of Short Radius Curve Continuous Box Beam Construction In Soft-Ground Area

The East-West Lake interchange bridge of Wuhan circles city road is consisted of four ramp bridges, namely A, B, C, and D ramp bridges. The types of beam include reinforced concrete box beam, variable cross-section priestesses reinforcement concrete continual box beam, steel box beam, pre-stressed spatial core beam. The four ring road bridges are located at the backfill area of East-West Lake, where there is a layer of soft soil of 31.5 m thick. The bearing capacity of this soft stratum is very low.One of the key problems to construct this interchange bridge is to construct the supporting system on soft ground area, which must be treated to satisfy the requirement of bearing capacity and settlement of ground imposed by the supporting system. By analyzing the possible settlement caused by the supporting system, Remove-and replacement method is adopted to treat the soft soil to support the full framing. Where there are ditches and trough gutters, military beam have to be used to form a framework structure to support the box beam. Crushed stone is suggested to be use as backfill material and can be recycled as the fill of subgrade.The hardened level is used to reserve the plum blossom hole convenience demolition, after broken takes the roadbed padding. Used bar the base to suppose the crosswise channel steel dispersible stress. Used the bowl to buckle steel the hand to make bar, the cross rod, vertical makes, horizontal and the horizontal scissors brace by the ordinary steel hand. Used the labor steel host keel replace the side mood keel. Optimized through above both saves the material and to guarantee the strut system intensity, thus had guaranteed pour the box beam safety, high quality, high effective and low consumption completionThe circles city road of Wuhan to exchange east-west lake crossing bridge continual box beam construction result to indicate that used the full house support plan construction A, B, the C effect is good, regardless of the security, the progress, the quality achieved the design and the standard request, ground processing and concrete the surface layer finally recycles with the crushed stone takes the roadbed padding, the economic efficiency enhancement. Used the military beam plan the D bridge, the construction progress slower, not security hidden danger high, the control difficulty is high, the partial lifting surface flank appears the small-wave phenomenon, increased repaired and maintained the expense. But it when surmounted barrier and so on ditch, river fully has played the roleThis article through experimental and the computation determination reasonable strut system controlled variable, the satisfactory solution has carried on common failing and so on beam body crack in the weak sub grade which concrete pour box beam constructs easily to appear, constructed the strut system for soft basic area continual box beam to provide a practical method, effectively has solved carried on less than half when soft basic the area after the curve continual box beam construction the related strut system essential technical question.