JGJ94-2008 PDF English
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| JGJ 94-2008 | English | 145 |
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Technical code for building pile foundations
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JGJ94-2008: Technical code for building pile foundations---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/JGJ94-2008
PROFESSIONAL STANDARD JGJ
OF THE PEOPLE'S REPUBLIC OF CHINA
Technical Code for Building Pile Foundations
Issued on: APRIL 22, 2008
Implemented on: OCTOBER 1, 2008
Issued by Ministry of Housing and Urban-Rural Development of the People's
Republic of China
Foreword
According to the requirements of Document Jian Biao [2003] No.104 issued by Ministry
of Construction (MOC), this code is revised from "Technical Code for Building Pile
Foundations" JGJ 94-94 by China Academy of Building Research together with relative
design, investigation and survey, construction, research and teaching organizations.
Special research and comprehensive diagnosis are carried out during the revision process.
The revision sums up design and construction experiences of our country's pile foundation in
recent years, absorbs scientific research achievements in this field, and solicits opinions
from related organizations throughout the country in various ways. Tentative design and
repeated revisions on key points are carried out. Based on the above, the code is reviewed and
finalized.
The code contains following key technical contents. provisions on pile foundation basic
design, pile foundation structure, calculation or checking computations for bearing capacity
ultimate limiting state and limiting state on normal condition of pile foundation, pile
foundation construction, concrete precast pile and piling bar construction, pile cap
construction, pile foundation engineering quality examination and acceptance, and relative
appendixes.
The code is supplemented with following contents. optimized design of pile foundation
stiffness to reduce differential settlement of reduced differential settlement and cushion cap
internal force; provisions on pile foundation durability; bearing capacity calculation and
construction process of post-grouting filling pile; composite foundation with settlement
reducing piles for soft soil foundation; calculation of settlements for single pile, single-raw
and thinned pile foundations; calculation for bearing capacities of compressive pile and uplift
pile; construction scheme of long auger drilling guncreting inserted with reinforcing cage
filling pile; bearing capacity calculation and pile-sinking of prestressed concrete hollow pile
etc. The adjusted main contents are as. taking-value and calculation of foundation pile and
composite foundation pile bearing capacities; empirical parameters of individual pile side
resistance and end resistance; comprehensive coefficient of rock-socketed piles rock-socket
section side resistance and end resistance; calculation for empirical coefficients of pile
foundation settlement through equivalent acting layerwise summation method; drilled and
grouted pile hole toe sediment thickness control standard etc.
The provision (s) printed in bold type is compulsory one and must be enforced strictly.
The Ministry of Construction is in charge of the administration of the code and the
explanation of compulsory provisions. And China Academy of Building Research is
responsible for the explanation of specific technical contents.
Chief Development Organization of the Code. China Academy of Building Research
Table of Contents
1 General Provisions ... 1
2 Terms and Symbols ... 2
2.1 Terms ... 2
2.2 Symbols ... 4
3 Basic Design Requirements ... 7
3.1 General Requirements ... 7
3 .2 Basic Documents ... 10
3.3 Type Selection and Arrangement of Pile ... 12
3.4 Pile Foundation in Exceptional Conditions ... 15
3.5 Requirement of Durability ... 19
4 Pile Foundation Structure ... 21
4.1 Foundation Pile Structure ... 21
4.2 Pile Capping Structure ... 25
5 Pile Foundation Calculations ... 29
5.1 Calculation for Pile Top Acting Effect ... 29
5.2 Calculation for Vertical Bearing Capacity of Piled Foundation ... 30
5.3 Vertical Ultimate Bearing Pressure of a Single Pile ... 33
5.4 Check Up for Vertical Bearing Capacity of The Piled Foundation Under Special
Conditions ... 45
5.5 Calculation for Piled Foundation Settlement... 53
5.6 Composite Foundation with Settlement-reducing Piles of Soft Soil Foundation ... 60
5.7 Calculation for Horizontal Bearing Capacity and Displacement of Piled Foundation
... 623
5.8 Calculation for Bearing Capacity and Fracture Control of Pile Shaft ... 68
5.9 Pile Cap Calculation ... 75
6 Filling Pile Construction ... 88
6.1 Preparations for Construction ... 88
6.2 General Requirements ... 89
6.3 Slurry Boring Cast-In-Place Pi le ... 92
6.4 Long Cast-In-Situ Bored Pile ... 98
6.5 Filling Piles with Sinking pipe and Inner Ramming Filling Piles with Sinking pipe99
6.6 Dry-work Pore-forming Filling Pile ... 103
6.7 Post Grouting for Cast-In-Situ Pile ... 106
7 Concrete Precast Pile and Piling Bar Construction ... 110
7.1 Concrete Precast Pile Manufacture ... 110
7 .2 Hoisting, Transportation and Storage of Concrete Precast Pile ... 112
7.3 Concrete Precast Pile Extension ... 113
7.4 Hammering Sinking Pile ... 115
7.5 Static Pressure Sinking Pile ... 118
7.6 Piling Bar (steel pipe pile, pile ofH type and other special steel piles) Construction
... 122
8 Pile Cap Construction ... 125
8.1 Foundation Pit Excavation and Backfilling ... 125
8.2 Steel Bar and Concrete Construction ... 125
9 Quality Inspection and Acceptance of the Pile Foundation Construction ... 127
9.1 General Requirements ... 127
9.2 Inspection before Construction ... 127
9.3 Construction Inspection ... 127
9.4 Inspection after Construction ... 128
9.5 Acceptance Materials of Foundation Pile and Pile Cap Project ... 129
Appendix A Selection for Pile Types and Pile Forming Technology ... 131
Appendix B Basic Parameters of Prestressed Concrete Hollow Pile ... 137
Appendix C Calculated Piled Foundation of Bearing Horizontal Load Considering Pile Cap
(including underground walling), Foundation Pile Coordiation Work and Soil
Elastic Resistance Acting ... 143
Appendix D Additional Stress Coefficient a and Average Additional Stress Coefficient ~
Calculated Through Boussinesq ... 161
Appendix E Calculation Parameters of Pile Foundation Equivalent Settlement Index l/fe. 176
Appendix F Stress Effect Coefficient through Mindlin Stress Formulas Considering Pile
Diameter Effect ... 186
Appendix G Calculation for Strip Pile Foundation Pile Capping Beam under Brick Wall
Aaccording to Inversed Beam on Elastic Foundation ... 226
Appendix H Weight Selection of Hammer for Hammering Sinking Pile ... 229
Explanation of Wording in This Code ... 231
1 General Provisions
1.0.1 The code is established to enable pile foundation design and construction to comply
with national technical economy politics, and to be of safety and usability, advanced
technology, economic feasibility, quality guaranteeing and environment protection.
1.0.2 The code is applicable to design, construction and acceptance for pile foundations of
all sorts of buildings (including structures).
1.0.3 For design and construction of pile foundation, engineering geological and hydro
geological conditions, topside structure type, functions of use, load characteristics, and
construction load condition and environment shall be considered comprehensively; and local
experiences and conceptual design shall be highly valued, the design shall adapt to local
conditions, and pile type, pile-making process and pile cap type shall be adopted reasonably
to optimize the pile arrangement and save the resources; construction quality control and
management shall be reinforced.
1.0.4 Besides this code, the design and construction, acceptance of pile foundation shall
comply with requirements of relative current standards.
2 Terms and Symbols
2.1 Terms
2.1.1 Pile Foundation
It is referred to a foundation composed of pile arranged in rock-soil and pile cap braced
with pile top, or an individual pile foundation formed through the direct connection of column
and pile.
2.1.2 Composite Piled Foundation
It is referred to the pile foundation loaded by the foundation pile and foundation soil
under the pile cap.
2.1.3 Foundation Pile
It is referred to an individual pile in the pile foundation.
2.1.4 Composite Foundation Pile
It is referred to the composite bearing foundation pile composed by an individual pile
and foundation soil under the pile cap of the area the individual pile corresponds to.
2.1.5 Composite Foundation with Settlement-reducing Piles
It is referred to the composite piled foundation composed of reducing friction-type pile
to decrease settlement in the cased of basic satisfied requirement of sof...
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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