Structural Transfer Beam"Sand Box"Support System and Construction Key Technology in Low Headroom Environment
To address the issue of bottom support for transfer beams in large section cast-in-place structures within low headroom construction environments,a novel pressure sand box support system is proposed.Through comparative and pre-loading tests conducted on-site,the impact of sand type,compaction degree,and compression settling rate on the bearing capacity and stability of backfilled sand boxes is investigated.The findings demonstrate that utilizing pressurized sand boxes as support systems for structural transfer beams is feasible.Furthermore,river sand should be selected as the preferred backfill material for these sand boxes,with compression settlement rate serving as the primary criterion and compaction degree acting as a secondary indicator for quality control purposes.Based on practical engineering applications,it is determined that when the compression settlement rate of the bearing sand box is less than 0.083 mm/h and the compaction degree exceeds 96%,construction quality requirements specified by relevant codes can be met.Additionally,key construction techniques employed during implementation are summarized to provide valuable references and guidance for future endeavors involving bottom support systems in cast-in-place structural members under low headroom conditions.
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