Hem steel sheet unit, combination formula steel sheet and thermal insulation wall structure

The utility model provides a hem steel sheet unit, combination formula steel sheet and thermal insulation wall structure relates to the technical field who personally experiences sth. Part of the body in building materials steel sheet and heat preservation room. A hem steel sheet unit includes notch plate structure, protruding structure and groove structure, protruding structure and groove structure phase -match on and the two adjacent hem steel sheet units, groove structure includes first curb plate, second curb plate and connects connecting plate between them first that second curb plate width is provided with the mounting hole of screw in the position of first curb plate department, and natural resources are sufficiently used, the box -like steel sheet of a species group comprises polylith hem steel sheet unit, be convenient for installation or dismantlement to effectively avoid the screw to expose, a thermal insulation wall structure includes combination formula steel sheet, main purlin, inferior purlin,