Detail of YBJ 226-1991

Introduction of YBJ 226-1991

1.0.1 This code is prepared for the purpose of making the sprayed concrete construction be in accordance with the requirements of advanced technology, economic rationality, guaranteed quality and safety. 1.0.2 Sprayed concrete has two types of construction methods, namely dry mixture spraying and wet mixture spraying. This code is prepared according to the dry mixture spraying construction method which is widely adopted in China at present. 1.0.3 This code is applicable to sprayed concrete construction for supporting of various underground engineering, for repairing and strengthening of buildings, side slope treatment as well as water tanks and thin shell structures. 1.0.4 Sprayed concrete construction shall be carried out according to the design requirements. Prior to construction, a construction organization design shall be developed, and preparation shall be enough so as to guarantee smooth construction. 1.0.5 Sprayed concrete construction shall not only comply with the requirements of this code, but also shall be implemented in accordance with relevant current national standards and codes.

Contents of YBJ 226-1991

Chapter 1 General Provisions 1 Chapter 2 Equipment for Sprayed Concrete Construction 2 Chapter 3 Raw Materials and Mix Proportion of Sprayed Concrete 3 Chapter 4 General Requirements for Sprayed Concrete Construction 5 Section 1 Construction Preparation 5 Section 2 Mixing and Transportation of Mixtures 5 Section 3 Spraying Operation 6 Section 4 Construction of Sprayed Concrete for Reinforcement Mesh 7 Section 5 Construction of Sprayed Concrete for Steel Fiber 8 Section 6 Winter Construction of Sprayed Concrete 8 Section 7 Curing of Sprayed Concrete 9 Chapter 5 Construction of Sprayed Concrete Supporting for Underground Engineering 10 Section 1 Equipment Arrangement for Construction of Sprayed Concrete 10 Section 2 Preparation for Construction Operating Surface of Sprayed Concrete 10 Section 3 Operation of Sprayed Concrete 11 Section 4 Construction of Sprayed Concrete for Steel Frame 11 Section 5 Ventilation and Dust Prevention 12 Chapter 6 Sprayed Concrete Construction of Building Restoration and Reinforcement 13 Chapter 7 Construction of Sprayed Concrete for Side Slope Engineering 15 Chapter 8 Construction of Sprayed Concrete for Pool and Shell Structure Engineering 16 Chapter 9 Safety Technique 18 Chapter 10 Quality Inspection and Engineering Acceptance 20 Section 1 Quality Inspection 20 Section 2 Engineering Acceptance 22 Appendix 1 Technical Performance of Common Concrete Spraying Machine 23 Appendix 2 Technical Requirements of Aggregate for Sprayed Concrete 24 Appendix 3 Preparation Method of Test Blocks for Compressive Strength of Sprayed Concrete 25 Appendix 4 Test Method of Sprayed Concrete Bonding Strength 26 Appendix 5 Technical Requirements for Determination of Sprayed Concrete Dust 27 Appendix 6 Explanation of Wording in This Code 28