CONSTRUCTION CONTROL OF STURCTURAL POST-CASTING BELTS OF BEJING NEW AIRPORT

The first floor of Beijing New Airport Terminal Building is a 437 m×565 m super large concrete slab supported by 1152 isolated bearings, which was divided into 11 sections by structural post-casting belts with a width of 4 m~4.5 m. In order to reduce the influence of the construction of the post-casting belts closure on the horizontal displacement of the isolation bearings, the variations of structural deformation under various sequences and schedules of closure construction were investigated based on the distribution model of the temperature field and the variation of the temperature in different regions. The results show that: the closure sequence of the post-casting belts has little effect on the maximum horizontal displacement of isolation bearings under the same temperature field; the construction schedule of the post-casting belt has obvious influence on horizontal displacement of isolation bearings; and when the cycle of construction step is 10 days, the displacement of the isolation bearings is the minimum.