CJJ 200-2014 Technical specification for city heat-supplying pipe net constructed by mining method
1 General provisions
1.0.1 This specification is formulated in order to make the design, construction and acceptance of city heat-supplying pipe net constructed by mining method technically advanced, safe and applicable, economical and reasonable, ensure quality and protect the environment.
1.0.2 This specification is applicable to the design, construction and acceptance of mined tunnel engineering in heat-supplying pipe net.
1.0.3 The design of heat-supplying pipe net constructed by mining method shall comply with relevant national laws and regulations, and pay attention to the impact of heat-supplying pipe net constructed by mining method on city environment and groundwater resources.
1.0.4 In the construction of the mined tunnel engineering of city heat-supplying pipe net, measures shall be taken to save land, energy, and protect the city environment. Measures shall be taken to properly handle the noise, waste residue, and structural waterproofing generated during the construction process.
1.0.5 The design service life of the main structure of city heat-supplying pipe net constructed by mining method shall not be less than 100 years.
1.0.6 Without technical appraisal or design permission, the purpose and use environment of tunnel structure shall not be changed.
1.0.7 The design and construction of city heat-supplying pipe net constructed by mining method shall follow the principles of pipe advance, strict grouting, short excavation, strong support, quick closure and frequent measurement.
1.0.8 New technologies, new processes, new equipment and new materials shall be actively adopted in the design and construction of city heat-supplying pipe net constructed by mining method.
1.0.9 The design, construction and acceptance of city heat-supplying pipe net constructed by mining method shall not only comply with this specification, but also comply with the current relevant national standards.
2 Terms and symbols
2.1 Terms
2.1.1
heat-supplying tunnels
tunnel used for laying city heat-supplying pipeline
2.1.2
a deep tunnel
tunnel in which the deformation and movement of stratum caused by excavation, support and lining construction do not affect the ground surface
2.1.3
a shallow tunnel
tunnel in which the deformation and movement of stratum caused by excavation, support and lining construction affect the ground surface
2.1.4
overburden
depth from the ground surface to the vault of tunnel support structure
2.1.5
mining method
construction method of underground cavern excavation by non-open-excavation method
2.1.6
New Austrian Tunneling Method (NATM)
method of using anchor bolts and shotcrete for timely support to control the deformation and relaxation of surrounding rock, and guiding the dynamic design and construction of tunnels through measurement and monitoring of surrounding rock and support
2.1.7
shallow tunneling method
method of construction that uses various auxiliary construction methods to improve and reinforce the surrounding rock in the underground area close to the surface, and follows the principles of NATM for underground excavation operations
2.1.8
surrounding rock
rock and soil mass within the influence range of tunnel engineering construction
2.1.9
classification of surrounding rock
classification method that selects several main indexes based on the main factors affecting the stability of surrounding rock, and uses a combination of qualitative division and quantitative indexes to classify the degree of stability of surrounding rock
2.1.10
initial stress field in ground
stress field formed in rock and soil mass under natural conditions due to self weight and geological tectonic movement
2.1.11
pressure acted by surrounding rock
pressure acting on the tunnel support or lining structure due to the deformation or looseness of surrounding rock after tunnel excavation in the initial stress field in ground
2.1.12
vertical shaft
well-shaped passage with upright tunnel wall for lifting earth and rock, transporting personnel and materials and for the purpose of ventilation
2.1.13
initial support
anchor bolt (anchor pipe) and shotcrete support that are timely applied after the excavation of vertical shafts and tunnels
2.1.14
final lining
formed concrete lining after the initial support of the tunnel is basically stable
2.1.15
inspection well
specialized structure installed on underground pipings at the accessories of pipelines that require frequent operation and maintenance
2.1.16
fixed trestle
pipeline trestle that not allows relative displacement of pipes
2.1.17
movable trestle
pipeline trestle that allows axial and lateral relative displacement of pipes
2.1.18
guiding trestle
pipe support that only allows axial displacement of pipes
2.1.19
groove for anti-sliding of fixed trestle
groove structure formed by appropriately expanding the initial support section of the tunnel at the fixed trestle to effectively transfer the thrust of the heat pipeline borne by the fixed trestle to the initial support and surrounding rock, preventing the overall movement of the fixed trestle
2.1.20
shotcrete
a type of concrete layer formed by using compressed air or other power to transport a concrete mixture mixed in a certain proportion along a piping to the nozzle, and spraying it vertically at a high speed on the sprayed surface. It relies on the continuous impact of cement and aggregate during the spraying process, forming a concrete layer through compaction
2.1.21
Foreword i 1 General provisions 2 Terms and symbols 2.1 Terms 2.2 Symbols 3 Engineering geology and hydrogeology survey 3.1 General requirements 3.2 Classification of surrounding rock 3.3 Survey of hydrogeological conditions 3.4 Geotechnical mechanical parameters 4 Design on plane and longitudinal-section of tunnel 4.1 General requirements 4.2 Plane 4.3 Longitudinal section of tunnel 4.4 Cross section of tunnel 4.5 Inspection well (vertical shaft) 5 Materials 6 Action (load) on structures 7 Structural design and calculation of inspection well (vertical shaft) 7.1 General requirements 7.2 Brace design of inspection well (vertical shaft) 7.3 Structural design of inspection well (vertical shaft) 7.4 Structural design of horsehead and sidewall opening of inspection well 7.5 Structural calculation of inspection well 8 Structural design and calculation of tunnel 8.1 General requirements 8.2 Structural design of tunnel 8.3 Structural design of upstand beam of portal at turning corner 8.4 Structural calculation of tunnel 9 Structural design and calculation of trestles 9.1 General requirements 9.2 Structures of fixed trestles at both ends 9.3 Structures of cantilever trestles 9.4 Structures of cross arm of trestles 9.5 Construction for trestles 10 Controlling groundwater and design on pre-reinforcing stratum 10.1 General requirements 10.2 Groundwater controlling 10.3 Stratum grouting 10.4 Advanced small pipe grouting and pipe roof 10.5 Jet grouting for reinforcing 10.6 Freezing stratum 11 Waterproofing of structure 11.1 General requirements 11.2 Self-waterproofing of concrete structures 11.3 Additional waterproof layer 11.4 Waterproofing of detail structures 12 Design on constructing and monitoring measurement 12.1 General requirements 12.2 Vertical shaft 12.3 Horsehead 12.4 Tunnel 12.5 Monitoring measurement 13 Special design on environmental risks due to construction 13.1 General requirements 13.2 Classification of environmental risks due to construction 13.3 Assessment on environmental risk due to construction 13.4 Design contents and requirements 14 Engineering construction 14.1 General requirements 14.2 Construction process and management 14.3 Special construction of environmental risks due to construction 14.4 Measuring and setting out 14.5 Protection of buildings (structures) and underground pipelines 14.6 Monitoring measurement 14.7 Groundwater controlling 14.8 Pre-support and reinforcing of strata 14.9 Vertical shaft 14.10 Horsehead 14.11 Tunnel excavating 14.12 Initial support 14.13 Waterproof layer 14.14 Final lining 14.15 Trestles 15 Engineering quality acceptance 15.1 General requirements 15.2 Procedure and organization of acceptance 15.3 Division of construction quality acceptance 15.4 Constructional quality acceptance 15.5 Monitoring measurement 15.6 Pre-support and reinforcing of strata 15.7 Inspection well (vertical shaft) 15.8 Earth excavation of tunnel 15.9 Initial support 15.10 Clearance measurement and through survey 15.11 Waterproofing of structure 15.12 Final lining 15.13 Trestles and piers 15.14 Appearance quality evaluation of unit works Annex A Classification of surrounding rock Annex B Calculation methods on other actions Annex C Structure of the inspection well and tunnel under horizontal action Annex D Calculation method on temperature expansion joint spacing of lining structures Annex E Construction acceptance records Explanation of wording in this specification List of quoted standards
