Construction joints gqf-c-type, also known as expansion joints gqf-c-type refers to prevent the building component temperature due to climate change (heat up, shrink), so that the structure of cracks or damage and proper position along the longitudinal direction of the housing a set of vertical construction joints. Gqf-c-type expansion joints are the basis of the above building components such as walls, floors, roofs (except wooden roof) is equally divided into two separate parts, so that the building can do along the length direction horizontal scaling.