Detail of JTS 167-4-2012

Introduction of JTS 167-4-2012

1 General Provisions 1.0.1 This code is formulated with a view to unifying technical requirements for design and construction of pile foundation in harbor engineering and achieving advanced technology, economy and rationality, safety and reliability, durability and applicability. 1.0.2 This code is applicable to design, construction and static load test of precast concrete pile, steel pipe pile, cast-in-situ pile and rock-socketed pile in the harbor engineering. 1.0.3 Design and construction of pile foundation in harbor engineering shall meet requirements of this code and national current relevant standards. 2 Terms 2.0.1 Single pile Single pile in the pile foundation. 2.0.2 Ultimate axial bearing capacity of a single pile The maximum load before the single pile reaches the failure state under the action of axial load or the corresponding load in case of deformation unsuitable for continuous load bearing. 2.0.3 Ultimate shaft resistance The maximum frictional resistance generated by the rocksoil against side surface of the pile shaft. 2.0.4 Ultimate tip resistance The maximum resistance generated by the rocksoil against pile tip. 2.0.5 Negative skin friction Downward frictional resistance greater than that due to settlement of single pile generated by soil around the pile against the surface on pile side. 2.0.6 Driven pile Pile sunken in the rocksoil by hammering and vibration methods. 2.0.7 Post tensioned prestress concrete cylinder pile Pipe pile, by post-tensioning method, spliced of precast concrete pipe sections manufactured in compound process. 2.0.8 Pretensioned spun concrete pile Pipe pile manufactured integrally by single-section pre-tensioning method and that spliced of precast pre-tensioning prestressed concrete pipe sections. 2.0.9 Cast-in-situ pile Pile formed through site hole forming, installation of reinforcement cage and site concrete pouring. 2.0.10 Rock-socketed pile Pile that pile tip and the bed rock are connected by methods such as site hole forming, pile placement, site concrete pouring or anchor bolt anchoring. 2.0.11 Cast-in-situ pile socketed in rock Rock-socketed pile formed through site hole forming, installation of reinforcement cage and site concrete pouring. 2.0.12 Cast-in-situ pile anchored in rock Pile that the cast-in-situ pile shaft and the bed rock are connected through anchoring of the anchor bolt in the rock mass. 2.0.13 Precast concrete pile or steel pipe pile socketed in rock Pile formed where precast concrete pile or steel pipe pile shaft enters into and is anchored with the bed rock. 2.0.14 Precast concrete pile or steel pipe pile with plug socketed in rock Pile formed where precast concrete pile or steel pipe pile is anchored with the bed rock through plug. 2.0.15 Precast concrete pile or steel pipe pile anchored in rock Pile that the cast-in-situ pile or steel pipe pile is connected with the bed rock where the anchor bolt is anchored in the rock mass. 2.0.16 Pile socketed and anchored in rock Pile formed where pile shaft or plug and anchor bolt socketed in rock. 2.0.17 Post grouting for cast-in-situ pile Cement mortar is filled through grouting conduit preset in cast-in-situ pile shaft and pile tip connected with it as well as grouting valve on the pile side. 3 Basic Requirements 3.1 General Requirements 3.1.1 Bearing capacity of pile shall be calculated on basis of different load-carrying condition according to structural strength of pile shaft and bearing capacity of foundation soil against the pile respectively, whichever is smaller. 3.1.2 Limit state design for bearing capacity of pile shall include the following items: (1) Calculation of axial bearing capacity and horizontal bearing capacity of foundation soil against the pile and checking of bearing capacity of soft substratum according to load-carrying conditions of the pile; (2) Calculation of compression, flexural, tension, shear and torsion bearing capacities of pile; (3) Checking of buckling stability of pile. 3.1.3 Serviceability limit state design of pile shall include the following items: (1) Anti-crack or limiting crack checking of concrete pile; (2) Horizontal deformation calculation of flexible mooring pile. 3.1.4 Actual load that is possible to act on the pile simultaneously shall be combined on basis of design limit state and design status according to the requirements of "Unified Standard of Reliability of Structural Design for Harbor Engineering" (GB 50158). 3.1.5 For pile foundation design, effect of settlement and horizontal displacement on structure shall be considered. 3.1.6 For pile foundation design, adverse effect of factors such as bank slope deformation, scouring, silting and soil settlement on the pile shall be considered. 3.1.7 Design and construction of pile foundation shall meet durability requirement; in freeze thawing region, effect of pile frost-heave and pile damage due to ice wear and collision shall also be considered. 3.1.8 For static load test pile, high-stress dynamic test should be carried out simultaneously. 3.1.9 Design and construction of pile foundation shall be provided with the following information:

Contents of JTS 167-4-2012

1 General Provisions 2 Terms 3 Basic Requirements 3.1 General Requirements 3.2 Selection of Piles 4 Bearing Capacity 4.1 General Requirements 4.2 Axial Bearing Capacity 4.3 Calculation of Pile under the Action of Horizontal Force 5 Structural Design of Precast Concrete Pile 5.1 General Requirements 5.2 Internal Force of Lifting Pile and Stress of Sinking Pile 5.3 Calculation and Construction of Square Concrete Pile 5.4 Calculation and Construction of Prestressed Concrete Pipe Pile 6 Structural Design of Steel Pipe Pile 6.1 Material 6.2 Calculation and Construction 6.3 Anti-corrosion 7 Structural Design of Cast-in-situ Pile 7.1 General Requirements 7.2 Calculation of Pile Shaft Structure 7.3 Structure Construction 8 Structural Design of Rock-socketed Pile 8.1 General Requirements 8.2 Construction of Cast-in-situ Pile Socketed in Rock 8.3 Structure selection and construction of Precast Pile Socketed in Rock 9 Construction of Precast Concrete Pile and Steel Pipe Pile 9.1 General Requirements 9.2 Selection of Pile-sinking Ship Equipment 9.3 Surveying and Positioning 9.4 Manufacturing of Prestressed Concrete Pile and Reinforced Concrete Pile 9.5 Manufacturing and Splicing of Prestressed Concrete Pipe Pile 9.6 Lifting, Stockpiling and Transportation in Precast Concrete Pile Site 9.7 Precast Concrete Pile Sinking 9.8 Manufacturing of Steel Pipe Pile 9.9 Welding of Steel Pipe Pile 9.10 Coating Construction of Steel Pipe Pile 9.11 Stockpiling and Transportation of Steel Pipe Pile 9.12 Steel Pipe Pile Sinking 9.13 Pile Sinking Control 9.14 Construction Inspection and Quality Control 10 Construction of Cast-in-situ Pile 10.1 General Requirements 10.2 Hole Drilling and Forming 10.3 Manual Hole Digging 10.4 Reinforcement Cage 10.5 Pouring of Concrete 10.6 Post Grouting for Cast-in-situ Pile 10.7 Construction Inspection and Quality Control 11 Construction of Rock-socketed Pile 11.1 General Requirements 11.2 Pile Sinking and Stabilizing Process 11.3 Hole Forming 11.4 Pouring of Concrete 11.5 Construction of Cast-in-situ Pile Socketed in Rock 11.6 Construction of Precast Concrete Pile or Steel Pipe Pile Socketed in Rock 11.7 Construction of Precast Concrete Pile or Steel Pipe Pile with Plug Socketed in Rock 11.8 Construction of Precast Concrete Pile or Steel Pipe Pile Anchored in Rock 11.9 Construction of Pile Socketed and Anchored in Rock 11.10 Construction Inspection and Quality Control 12 Static Axial Load Test 12.1 General Requirements 12.2 Test Equipment 12.3 Static Load Test 12.4 Static Load Test for Uplift Resistance of Anchor Bolt 13 Horizontal Static Load Test 13.1 General Requirements 13.2 Test Equipment 13.3 Static Load Test Appendix A Reconnaissance Point of Pile Foundation Engineering Appendix B Schematic Diagram for Rock-socketed Type and Construction of Rock-Socketed Pile Appendix C Pile Group Reduction Coefficient for Pile Foundation of High-Rise Pile Cap Appendix D Calculation of Pile under the Action of Horizontal Force D.1 NL Method D.2 P-Y Curve Method D.3 m Method Appendix E Determination of Lateral Deflection Effective Length of Pile Appendix F Lifting Point Layout and Lifting Internal Force Calculation of Pile Appendix G Lifting Lug Plate Design Appendix H Record List for Pile Sinking Test Appendix J References for Selection of Hammer Appendix K Pile Sinking and Positioning Records Appendix L Comprehensive Hammering and Pile Sinking Records Appendix M Records of Pile Sinking by Jetting and Hammering Appendix N References for Water Pump, Discharge Jet and Multihole Nozzle Used in Pile Sinking by Jetting and Hammering Appendix P Slurry Performance Index Appendix Q Performance Requirements for Slurry Raw Material Cohesive Soil, Swell Soil and Admixture Appendix R Determination Method for Slurry Performance Index Appendix S Application Scope of Common Hole Forming Equipment Appendix T Hole Drilling and Forming Records Appendix U Ballast Test Record of Test Pile Appendix W Explanation of Wording in This Code Additional Explanation Name List of Chief Development Organization, Participating Organizations, Chief Drafting Staff, Chief Checking Personnel and Administrative Group Personnel of This Code