Technology for installing pre-buried bolts to large-scale air separation device cold box

The invention provides a technology for installing pre-buried bolts to a large-scale air separation device cold box. The method comprises the following steps that 1, a foundation steel plate is pre-buried in a cushion layer of the air separation device cold box; 2, a support used for installing the pre-buried bolts is built on the foundation steel plate; 3, the pre-buried bolts are installed, wherein multiple distance formworks are fabricated, a first position point used for installing the corresponding pre-buried bolt is determined on any distance formwork, any distance formwork is welded to the upper end face of a box iron cross beam through angle iron, a through hole which penetrates through the box iron cross beam and is matched with the corresponding pre-buried bolt is formed in the first position point, and the corresponding pre-buried bolt is installed in the through hole; 4, welding seams are detected. According to the technology, the support is welded inside the large-scale air separation device cold box, the pre-buried bolts are installed on the box iron cross beams of the support, the support is utilized for achieving the overall support and reinforcement, and the installation of the pre-buried bolts is completed.