... H-style steel.2. The columns are connected with the foundation by pre-embedding anchor bolt.3 ... beams and columns, beams and beams are connected with high intensity bolts.4. The envelop construction net ... or color steel sandwich panels, which are connected with the purlin by Self-tapping nails.6. ... made into normal type, sliding type or roll up type with material of PVC, metal, alloy aluminium, sandwich ...