CPC E01D 21/00 (2013.01) [E01D 4/00 (2013.01)] | 10 Claims |
1. A method for installing steel tube arches, comprising the following steps:
step S1, erecting steel tube arch assembling brackets for a steel tube arch of longitudinally moving segment;
step S2, assembling the steel tube arch of longitudinally moving segment;
(1) assembling small steel tube arch segments into installation segments;
(2) installing arch springing longitudinally moving trolleys on both sides of the steel tube arch of longitudinally moving segment;
(3) using two truck cranes to symmetrically assemble the installation segments according to a sequence from arch springing to vault;
step S3, installing temporary tie rods of the steel tube arch of longitudinally moving segment and stretching to form a temporary tied arch structure;
step S4, dismantling the assembling brackets symmetrically from middle to both sides;
step S5, longitudinally moving the steel tube arch of longitudinally moving segment:
(1) after a closure of continuous girder of a main bridge, laying and installing a longitudinally moving track and debugging a longitudinal jack system;
(2) using jacks to smoothly and continuously push the steel tube arch of longitudinally moving segment to a designed lifting position of a main span;
step S6, erecting arch springing brackets and assembling small mileage arch springing segments;
(1) using a tower crane to erect small mileage arch springing brackets;
(2) pouring arch springing concrete;
step S7, closing a steel tube arch:
(1) continuously measuring a dimension of closure opening;
(2) matching and cutting a steel tube arch of inlaying segment according to the measured data;
(3) completing closure construction of the steel tube arch at a closure temperature;
step S8, arch falling, unloading the temporary tie rods in stages, and dismantling the arch springing longitudinally moving trolleys;
step S9, performing construction of concrete and suspenders in the steel arch:
(1) pumping and injecting arch rib concrete with pressure according to a sequence of upper chord first, then lower chord, then web plate;
(2) installing long suspenders first and then installing short suspenders, and tensioning the suspenders.
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