중공슬래브 고정장치의 인발실험을 통한 부력저항성능 평가

The voided slab is an economical structural system that has the equivalent structural performance of a solid slab despite a decrease of weight achieved by substituting lightweight foam for the concrete in the middle of the slabrete in the However, void slabs float due to the differences in specific gravities of concrete and foam. The goal of this study is to design fixing equipment for the foam filler applicable to void slabs and to evaluate the buoyancy protection performance. Since there are no preexisting performance indicators for verifying the fixing performance of foam filler fixing equipment, this study established its own criteria for pull-out tests that were performed as a function of variables such as coating conditions, hole sizes of the formwork, and fixture position. According to the pull-out test results, the tensile performance of uncoated plywood is influenced by hole size. However, it was shown that the size of the hole and the position of the fixture for the coated plywood do not affect the tensile performance of the fixing equipment. Therefore, this fixing equipment can be deployed even with lager holes for the convenience of workers without affecting the fixing performance if coated plywood is used. Additionally, the workability may be improved since the fixture can be fixed with one-touch from the top of the slab without any separate installation state verification process.