Short Tower Cable-stayed Bridge Construction Key Technology Research

Short tower cable-stayed bridge is between PC continuous girder bridge and between PCcable-stayed bridge is a kind of new bridge structure form, closer to the concrete continuousgirder bridge (continuous rigid frame), sew line is only a supplementary role. The bridge bothcontinuous girder bridge rigidity and cable-stayed bridge soft beauty, has the very bigdevelopment potential. Its characteristic is to build economic, beautiful modelling,construction is convenient, has the very big development potential.Based on the pear sichuan bridge short tower cable-stayed bridge for backgroundresearch, mainly to do the following several aspects work:1, analysis of short pylon cable-stayed bridge structure type, bridge type classification andmechanical characteristics, analog short tower cable-stayed bridge of three kinds of structuresystem, using the method of comparative analysis and study on mechanical properties of shorttower cable-stayed bridge.2, cable tower pillar using rolling over method construction, is template system consists ofpylon concrete own strength anchorage position, alternating ascension multisection templates,realize the pylon without support construction.3, girder using symmetrical cantilever casting method, that is on both sides of the pillar withhanging basket symmetrically pouring concrete construction method.4, sew line construction is in the main girder with cantilever segmental construction at thesame time of symmetry. In the main girder have cable section concrete strength meet therequirements, to sew line hang set and tension.5, construction control should be linear and stress control is given priority to, the wholestructure of the bridge in the cable-stayed bridge girder cable force and control level as adouble control, level control is given priority to. Is mainly to the main girder displacementcontrol, linear control primarily, by force control is the construction control implementationprinciple.