Specification for construction and acceptance of steel storage tank subgrade & foundation in petrochemical industry
1 Scope
This specification specifies the technical and quality criteria as well as project acceptance and technical documents for completion for the construction of steel storage tank subgrade & foundation and foundation settlement observation.
This specification is applicable to the construction and acceptance of vertical cylindrical steel storage tank subgrade & foundation in petrochemical industry and coal-chemical industry and the construction and acceptance of the steel gas tank subgrade & foundation, but not applicable to the construction and acceptance of the prestressed concrete steel storage tank subgrade & foundation.
2 Normative references
The following documents are indispensable for the application of this specification. For dated references, only the edition cited applies. For undated reference, the latest edition (including any amendments) applies.
GB/T 50430 Code for quality management of engineering construction enterprises
GB 50484 Technical code for construction safety in petrochemical engineering
GB 50496 Standard for construction of mass concrete
GB/T 50756 Technical code for ground treatment of steel tanks
GB/T 17639 Geosynthetics - Synthetic filament spunbond and needlepunched nonwoven geotextiles
GB/T 17643 Geosynthetics - Polyethylene geomembrane
GB 1499.2 Steel for the reinforcement of concrete - Part 2: Hot rolled ribbed bars
JGJ 18 Specification for welding and acceptance of reinforcing steel bars
JGJ 46 Technical code for safety of temporary electrification on construction site
JGJ/T 104 Specification for winter construction of building engineering
JGJ 107 Technical specification for mechanical splicing of steel reinforcing bars
JGJ/T 178 Technical specification for application of shrinkage-compensating concrete
SH/T 3503 Specification on handover technical documentation for petrochemical construction projects
SH/T 3510 Acceptance specification for construction quality of equipment concrete foundations in petrochemical industry
3 Terms and definitions
For the purposes of this specification, the following terms and definitions apply.
3.1
ground improvement
engineering measure taken to increase the bearing capacity of subgrade or improve its deformation or permeability
3.2
composite foundation
foundation of which part soil is reinforced or replaced to form a reinforced body that together with the surrounding foundation soil bears the load
3.3
cushion
hard and dense foundation soil formed by digging out the shallow soft soil layer or uneven soil layer on the surface, backfilling the specified materials, and then compacting or tamping
3.4
slope protected foundation
foundation which bears load jointly by the concrete slope protection or crushed stone slope protection and the packing layer, sand layer and asphaltic sands insulating layer inside the slope protection
3.5
ringwall foundation
foundation which bears load jointly by the reinforced concrete ringwall and the packing layer, sand layer and asphaltic sands insulating layer inside the ringwall
3.6
outside ringwall foundation
foundation which bears load jointly by the reinforced concrete ringwall and the packing layer, sand layer and asphaltic sands insulating layer inside the ringwall
3.7
pile foundation
foundation which bears load jointly by the pile and the reinforced concrete pile cap connected to the pile top as well as the packing layer, sand layer and asphaltic sands insulating layer of the pile cap
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 General provision
4.1 Basic provision
4.2 Type of storage tank foundations
5 Construction of storage tank subgrade
5.1 Basic provision
5.2 Subgrade acceptance
6 Storage tank foundation construction
6.1 Earthwork excavation and backfilling
6.2 Foundation bed
6.3 Reinforced concrete foundation
6.4 Packing layer and impermeable layer/sand layer in ringwall
6.5 Asphaltic sands insulating layer
6.6 Heat insulation layer
6.7 Construction of auxiliary facilities
7 Leak test and foundation settlement observation
7.1 Basic provision
7.2 Settlement observation results
8 Defect disposal
9 Technical documents for completion
Annex A (Normative) Classification of subsection works/sub-subsection works and subitem works
Annex B (Informative) Cylinder diesel piling hammer parameters
Annex C (Normative) Quality control criteria for packing layers and asphaltic sands insulating layers
Annex D (Informative) Trademark and performance of petroleum asphalt
Bibliography
Explanation of wording in this specification
