1.0.1 This specification was formulated with a view to achieving advanced technology, economy and rationality, safety and usability, guaranteed quality and environmental protection in investigation, design, construction and quality checkout of large-diameter belled cast-in-place pile.
1.0.2 This specification is applicable to investigation, design, construction and quality checkout of large-diameter belled cast-in-place pile in construction engineering.
1.0.3 For investigation, design, construction and quality checkout of large-diameter belled cast-in-place pile, comprehensive analysis shall be carried out for engineering geology and hydrogeological conditions of construction site, superstructure type, construction technology and conditions as well as the environment; pile hole technology is reasonably selected; construction safety and quality control are strengthened and pile arrangement is optimized so as to save resources.
1.0.4 Investigation, design, construction and quality checkout of large-diameter belled cast-in-place pile shall meet not only those specified in this specification, but also the requirements of relevant current national standard.
1 General Provisions 1
2 Terms and Symbols 1
2.1 Terms 1
2.2 Symbols 2
3 Basic Requirements 4
4 Basic Design Informations and Investigation Requirements 6
4.1 Basic Design Informations 6
4.2 Investigation Requirements 7
5 Basic Structures 9
5.1 Structures of Large-Diameter Belled Cast-in-place Pile 9
5.2 Structures of Pile Cap and Continuous Beam 10
6 Design and Calculation 13
6.1 Calculation of Pile Cap Effect 13
6.2 Caculations of Vertical Bearing Capacity and Settlement 13
6.3 Horizontal Bearing Capacity and Uplift Resistance 20
7 Construction 20
7.1 General Requirements 20
7.2 Construction Preparation 22
7.3 Large-diameter Belled Cast-in-place Pile by Slurry Drilled 23
7.4 Large-diameter Belled Cast-in-place Pile by Dry Construction 27
7.5 Post-grouting of Large-diameter Belled Cast-in-place Pile 30
7.6 Safety Measures 31
8 Quality Checkout 32
8.1 General Requirements 33
8.2 Quality Checkout for Pile Hole 34
8.3 Quality Checkout for Belled Pile 34
8.4 Quality Acceptance of Large-Diameter Belled Cast-in-place Pile and Pile Cap 36
Appendix A Durability Requirements 37
Appendix B Static Loading Test Methods of a Large-Diameter Belled Cast-in-place Pile for Vertical Pressure Bearing Capacity 38
Appendix C Checking Method by Ultrasonic for Pile Hole of Large-Diameter Belled-drilled Cast-in-place Pile 40
Appendix D Checking Method of Umbrella-Shaped Hole-Diameter Instrument for Large-Diameter Belled-drilled Cast-in-place Pile 42
Appendix E Calibration Method for Umbrella-shaped Hole-diameter Instrument 44
Explanation of Wording in This Specification 45
List of Quoted Standards 46
1.0.1 This specification was formulated with a view to achieving advanced technology, economy and rationality, safety and usability, guaranteed quality and environmental protection in investigation, design, construction and quality checkout of large-diameter belled cast-in-place pile.
1.0.2 This specification is applicable to investigation, design, construction and quality checkout of large-diameter belled cast-in-place pile in construction engineering.
1.0.3 For investigation, design, construction and quality checkout of large-diameter belled cast-in-place pile, comprehensive analysis shall be carried out for engineering geology and hydrogeological conditions of construction site, superstructure type, construction technology and conditions as well as the environment; pile hole technology is reasonably selected; construction safety and quality control are strengthened and pile arrangement is optimized so as to save resources.
1.0.4 Investigation, design, construction and quality checkout of large-diameter belled cast-in-place pile shall meet not only those specified in this specification, but also the requirements of relevant current national standard.
Contents of JGJ/T 225-2010
1 General Provisions 1
2 Terms and Symbols 1
2.1 Terms 1
2.2 Symbols 2
3 Basic Requirements 4
4 Basic Design Informations and Investigation Requirements 6
4.1 Basic Design Informations 6
4.2 Investigation Requirements 7
5 Basic Structures 9
5.1 Structures of Large-Diameter Belled Cast-in-place Pile 9
5.2 Structures of Pile Cap and Continuous Beam 10
6 Design and Calculation 13
6.1 Calculation of Pile Cap Effect 13
6.2 Caculations of Vertical Bearing Capacity and Settlement 13
6.3 Horizontal Bearing Capacity and Uplift Resistance 20
7 Construction 20
7.1 General Requirements 20
7.2 Construction Preparation 22
7.3 Large-diameter Belled Cast-in-place Pile by Slurry Drilled 23
7.4 Large-diameter Belled Cast-in-place Pile by Dry Construction 27
7.5 Post-grouting of Large-diameter Belled Cast-in-place Pile 30
7.6 Safety Measures 31
8 Quality Checkout 32
8.1 General Requirements 33
8.2 Quality Checkout for Pile Hole 34
8.3 Quality Checkout for Belled Pile 34
8.4 Quality Acceptance of Large-Diameter Belled Cast-in-place Pile and Pile Cap 36
Appendix A Durability Requirements 37
Appendix B Static Loading Test Methods of a Large-Diameter Belled Cast-in-place Pile for Vertical Pressure Bearing Capacity 38
Appendix C Checking Method by Ultrasonic for Pile Hole of Large-Diameter Belled-drilled Cast-in-place Pile 40
Appendix D Checking Method of Umbrella-Shaped Hole-Diameter Instrument for Large-Diameter Belled-drilled Cast-in-place Pile 42
Appendix E Calibration Method for Umbrella-shaped Hole-diameter Instrument 44
Explanation of Wording in This Specification 45
List of Quoted Standards 46
