Type selection for rig foundation
1 Scope
This standard specifies the type selection and calculation method of onshore oil rig foundation.
This standard is applicable to the foundation design of derrick substructure, engine-pump house and circulating system of onshore oil rig.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions, of any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.
GB 5007 Code for design of building foundation
SY/T 5025 Specification for drilling and well servicing structures
3 Terms and definitions
For the purposes of this standard, the terms and definitions given in GB 5007, as well as the following apply.
3.1
subsoil
soil or rock bearing foundation
3.2
soft soil
mud, muddy soil and partial dredger fill, miscellaneous fill as well as other highly compressible soil
3.3
supporting layer
soil layer directly bearing foundation load
3.4
subgrade bearing capacity
capacity of subsoil to bear load
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Types of rig foundation
5 Foundation type selection
6 Arrangement of rig foundation
7 Protection of rig foundation
8 Requirements for supporting layer of foundation subsoil
Annex A (Informative) Foundation type selection table
Annex B (Informative) Calculation of rig foundation
