SY/T 6884-2024 Specification for design of shaft in oil and gas pipelinecrossing engineering English, Anglais, Englisch, Inglés, えいご
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ICS
E
Professional standard of the People's Republic of China
SY/T 6884-2024
Replaces SY/T 6884-2012
Specification for design of shaft in oil and gas pipeline crossing engineering
油气管道穿越工程竖井设计规范
(English Translation)
Issue date: 2024-09-24 Implementation date: 2025-03-24
Issued by National Development and Reform Commission, P.R.C
Contents
1 General provisions
2 Terms
3 Basic requirements
4 Action and design calculation
5 Structure design
6 Design of sinking well structure
7 Retaining design
8 Structural requirements
Appendix A Standard value calculation of shaft lateral pressure
Specification for design of shaft in oil and gas pipeline crossing engineering
1 General Provisions
1.0.1 This code is formulated with a view to implementing relevant national laws and regulations in the design of shafts for oil and gas pipeline crossing engineering, unifying technical requirements, and achieving safety, reliability, advanced technology, energy saving, environmental protection, economy, and applicability.
1.0.2 This code is applicable to the design of shafts in oil and gas pipeline crossing engineering.
1.0.3 In addition to complying with the provisions of this code, the design of shafts shall also comply with the requirements of current relevant national standards.
2 Terms
2.0.1
shaft
A vertical wellbore constructed during construction and operation periods to facilitate operations such as pipeline installation, transportation of equipment and materials, personnel access, power supply, ventilation, water supply and drainage.
2.0.2
pipeline crossing engineering
Construction project where oil and gas pipelines pass underneath artificial or natural obstacles.
2.0.3
lining
A structure that covers the surrounding rock around the tunnel perimeter to control and prevent the deformation or collapse of the surrounding rock and ensure its stability.
2.0.4
shaft depth
The net height measured from the natural ground surface on the outer side of the shaft wall to the excavated bottom surface inside the shaft.
2.0.5
shaft penetration depth
The depth to which the outer wall of the shaft is inserted into the rock or soil layer.
2.0.6
mining method
A construction method for building tunnels by excavating underground openings.
2.0.7
surrounding rock
The rock and soil mass within the influence zone of the tunnel engineering.
2.0.8
sinking well
An underground structure formed by pre-casting a structure on the ground surface and sinking it to a predetermined elevation through excavation of soil from within the well.
2.0.9
sinking by drainage
The process where accumulated water inside the well is drained during soil excavation operations while the caisson is sinking.
2.0.10
sinking without drainage
The process where accumulated water inside the well is not drained during soil excavation operations while the caisson is sinking.
2.0.11
cutting curb
The beveled part at the lower end of the caisson wall plate, used to support the caisson's weight and cut into the soil during sinking.
2.0.14
reversed construction method
A construction method where excavation and support are carried out layer by layer from the ground surface downward to form an underground structure.
2.0.15
anchor and shotcrete support
A support structure composed of shotcrete, rock bolts (anchors), and/or steel mesh, etc.
2.0.16
secant piles in row
A continuous pile wall formed by interlocking overlapping cast-in-place concrete piles, providing earth retention and water sealing functions.
2.0.17
soil mixed wall
A composite retaining structure for earth retention and water sealing, formed by inserting structural steel sections into continuously interlocking triaxial cement-soil mixed piles.
2.0.18
soil-cement pile mixed by three shafts
A pile formed by using cement as the main solidifying agent, forcibly mixing the solidifying agent with the foundation soil using a triaxial mixing machine, causing the foundation soil to harden into a pile body with continuity, impermeability, and a certain strength.
2.0.19
steel sheet piling
Steel components processed by cold bending or hot rolling methods, featuring connecting interlocks.
2.0.20
retaining structure of steel sheet pile
A structure composed of elements such as steel sheet pile walls, anchors (cables), struts, capping beams, wales, etc., providing support and resistance for the shaft.
2.0.21
capping beam
A reinforced concrete or steel beam installed at the top of a retaining structure to connect the retaining structure into an integral unit.
3 Basic Requirements
3.0.1 Shaft design shall be based on the topography, geology, hydrology, meteorology, seismicity, pipeline layout, as well as pipeline construction and operation/maintenance conditions, and shall undergo comprehensive comparison and selection of multiple schemes considering technology, economy, and environment.
3.0.2 In pipeline crossing engineering design documents, the design working life of the shaft structure engineering shall be specified; the design working life of waterproofing shall not be lower than the design working life of the main structure.
3.0.3 The safety class and structural design working life of the main shaft structure shall comply with the provisions of the current national standard Unified Standard for Reliability of Engineering Structures GB 55001. Within the specified structural design working life, the reliability requirements shall be met. The safety class of the main shaft structure shall be divided into three levels and shall conform to the provisions in Table 3.0.3.
Table 3.0.3 Safety Classes for Main Shaft Structure
