METHOD TO ERECT BASE PIER SECTION OF CABLE TRUSS BRIDGE SPAN CABLE-STAYED GIRDER AND PILOT BEAM TO REALISE THIS METHOD

摘要

FIELD: construction.;SUBSTANCE: method to erect a base pier section of a cable truss bridge span cable-stayed girder consists in erection of a temporary pier structure in the lower part of a pylon, assembly of span cable-stayed girder blocks on it and installation of assembly units on the pier section. Previously at the distance from the pylon a temporary bridge support is erected, a lower link is erected on the pylon, then scaffolding is fixed on the temporary support and the pylon, and a temporary pier structure is erected on them in the form of a pilot beam. By means of sliding supports it is rested with one end to a cap of the temporary support, and with the other one - onto the pylon link. Rolling tracks, support and anchor beams with an assembly device and a counterbalance are mounted on the pilot beam. Afterwards the first block of the span cable-stayed girder is lifted with the help of the assembly device and joined to the end of the pilot beam. A length comprising a span cable-stayed girder block and a pilot beam together with an assembly crane and a counterbalance is moved towards a pylon for a distance equal to the length of the mounted cable-stayed girder block. Then the assembly device is moved to a new site as resting onto the assembled cable-stayed girder block, and after assembly of the following block of the cable-stayed girder and movement of the entire length to a new site towards the pylon, the counterbalance is moved towards the pylon, and the end transverse volume block of the pilot beam is dismantled. Afterwards the process of cable-stayed girder blocks assembly is repeated. Prior to longitudinal launching of the length with two last transverse volume blocks of the pilot beam the counterbalance is dismantled, and after assembly of all blocks of the cable-stayed girder of the base pier section its ends are suspended to the pylon cap with the help of guy cables and tightened. The version is proposed to provide a pilot beam to implement the proposed method.;EFFECT: increased operational reliability.;5 cl, 11 dwg