CJJ/T 284-2018 1 General provisions
1.0.1 This standard is formulated with a view to achieving advanced technology economic rationality, safety and applicability, and ensuring quality and environmental protection in the design, construction and acceptance of mechanical pipe jacking of heating engineering.
1.0.2 This standard is applicable to the design, construction and acceptance of mechanical pipe jacking of heating engineering.
1.0.3 The mechanical pipe jacking of heating engineering in frozen soil regions, collapse regions, collapsible loess regions and expansive soil regions shall meet the requirements of the current relevant standards of the nation.
1.0.4 In addition to this standard, the design, construction, and acceptance of mechanical pipe jacking of heating engineering shall also meet the requirements of the current relevant standards of the nation.
2 Terms
2.0.1 pipe jacking
trenchless pipeline construction method to jack prefabricated pipe sections from the jacking shaft to the reception shaft using hydraulic jacking equipment
2.0.2 pipe jacking with machine (mechanical pipe jacking)
pipe jacking construction method to excavate soil with a machine
2.0.3 jacking machine
mechanical equipment installed at the front end of the jacking pipeline for mechanical excavation, soil removal, guiding, steering and other operations, and able to lay pipes with the jacking device in the rear
2.0.4 working shaft
shaft used for equipment assembly and disassembly, pipe jacking, pipe section hoisting and soil removal during pipe jacking construction, including jacking and reception shafts
2.0.5 jacking shaft
shaft at the launching end of pipe jacking to place jacking equipment and jack pipes
2.0.6 intermediate jacking station
jacking facility that divides the whole pipeline into several thrust units
2.0.7 reception shaft
shaft at the end of pipe jacking to receive the jacking machine
2.0.8 reaction soil
soil bearing the reaction force of the main jacking cylinder
2.0.9 reaction wall
wall of the jacking shaft that bears the reaction force of the main jacking cylinder
2.0.10 concrete jacking base
concrete reaction wall made in the jacking shaft
2.0.11 steel plate of jacking base
steel member installed between the main jacking cylinder and the reaction wall/concrete jacking base to extend the bearing area of the reaction wall
2.0.12 guide track
track fixed on the base plate of the jacking shaft for initial guide for pipe jacking and splicing of pipe sections, or that fixed on the bottom plate of the reception shaft as the track for receiving the jacking machine
2.0.13 jacking force
force exerted by the jacking cylinder on the end of jacking pipe sections during pipe jacking construction in order to overcome jacking resistance
2.0.14 drag reduction methods
methods adopted to reduce the frictional resistance during the pipe section jacking process
2.0.15 attitude control
state control of the jacking machine in jacking process
3 Engineering geological and environmental investigations
3.1 General requirements
3.1.1 The structural design and construction of pipe jacking engineering shall be based on data obtained in the engineering geological and environmental investigations.
3.1.2 The geological and environmental investigations of pipe jacking engineering shall include drilling and geophysical exploration.
3.1.3 If there are harmful gases and other harmful substances within the pipe jacking pipeline, their distribution shall be identified and safety measures shall be taken.
3.1.4 After the engineering geological investigation is finished, exploration holes shall be plugged.
3.2 Engineering geological investigation
3.2.1 During the engineering geological investigation, the hydrogeological and geomorphological conditions, stratum structure characteristics, soil layer properties and distribution space and other conditions along the line shall be identified.
3.2.2 The drill holes for geological investigation shall meet the following requirements in terms of their locations and quantity:
1 They should be located in the working shaft and shall be arranged on the pipe jacking side; and they should not be greater than 5 m from the outer contour of the jacking pipe;
2 If the jacking pipe needs to cross railways, urban rail transit and other municipal pipelines, the position of drill holes shall not affect their normal operation;
3 At least 2 drill holes for investigation in the working shaft shall be arranged at the corners;
4 Drill holes for investigation during pipe jacking shall be arranged with an interval of 100 m–150 m for Class I sites, 50 m–100 m for Class II sites, and 30 m–50 m for Class III sites, respectively.
3.2.3 The depth of drill holes for geological investigation shall meet the following requirements:
1 The pipe jacking route shall be 3 m–5 m below the design elevation of the bottom of the jacking pipe;
2 The depth of drill holes in the working shaft shall be 5 m below the elevation of the shaft bottom;
3 If there is soft soil layer or unconsolidated backfill soil in the pipe jacking foundation, in addition to the requirements of paragraphs 1 and 2 above, the drill holes shall also be deepened;
4 If pipe jacking needs to cross a waterway, the depth of drill holes shall be 4 m–6 m below the maximum scouring depth of the riverbed, and shall meet the requirement for investigation depth below the jacking pipe bottom;
5 When there is silty fine sand in the pipe jacking foundation, which may cause flowing sand, piping or seismic liquefaction stratum, the stratum shall be drilled through;
6 When the working shaft is constructed by lowering the groundwater level, the depth of drill holes shall meet the dewatering design requirements.
3.2.4 The groundwater investigation shall meet the following requirements:
1 Groundwater types, aquifer types, burial conditions of groundwater, recharge and discharge conditions and distribution characteristics shall be investigated;
2 Highest and lowest groundwater levels on records shall be investigated;
3 The pH value of groundwater, the contents of chloride ion, calcium ion and sulfate ion, and the corrosiveness to concrete, engineering-related metal materials and rubber shall be determined;
4 When there is confined water distributed underground, its distribution range shall be investigated and its pressure shall be determined.
3.2.5 The investigation report shall include preliminary investigation report, detailed investigation report and construction investigation report, and shall meet the following requirements:
1 The preliminary investigation report shall describe the engineering geological conditions of the site and cover evaluation on the stability and adaptability of the site;
2 The detailed investigation report shall provide the physical and mechanical properties and parameters of each rock and soil layer required by the working shaft and pipe jacking interval at design and construction stages, as well as groundwater and environmental data, and shall cover analysis, evaluation, conclusions and suggestions;
1 General provisions
2 Terms
3 Engineering geological and environmental investigations
3.1 General requirements
3.2 Engineering geological investigation
3.3 Engineering environmental investigation
4 Design of plane and longitudinal-section
4.1 General requirements
4.2 Design of plane
4.3 Design of longitudinal-section
5 Action on the structure
5.1 Classification of actions
5.2 Permanent action
5.3 Variable action
5.4 Accidental action
6 Basic design regulations of pipe jacking structure
6.1 General requirements
6.2 Calculation under ultimate limit state of carrying capacity
6.3 Checking computation under the serviceability limit state
6.4 Material and durability
6.5 Design of trestles inside the jacking pipe
7 Structural design and calculation of jacking pipe
7.1 General requirements
7.2 Checking computation of nozzle carrying capacity
7.3 Calculation of pipe section internal force
7.4 Calculation of jacking pipe deformation and checking computation of anti-slip stability
7.5 Construction
8 Design of working shaft
8.1 General requirements
8.2 Jacking shaft
8.3 Reception shaft
9 Waterproof design
9.1 General requirements
9.2 Pipe jacking joint
9.3 Waterproofing of inspection well opening
10 Pipe jacking construction
10.1 General requirements
10.2 Selection of jacking machine
10.3 Construction preparation
10.4 Waterstop and shield of working shaft opening
10.5 Jacking pipe and accessories
10.6 Working shaft and reaction wall
10.7 Launching and receiving
10.8 Intermediate jacking station
10.9 Normal jacking
11 Monitoring measurement
11.1 General requirements
11.2 Monitoring items and control
11.3 Jacking direction monitoring items and control
12 Construction acceptance
12.1 General requirements
12.2 Quality acceptance
12.3 Completion acceptance
Explanation of wording in this standard
List of quoted standards
Explanation of provisions
Standard
CJJ/T 284-2018 Technical standard for mechanical pipe jacking of heating engineering (English Version)
Standard No.
CJJ/T 284-2018
Status
valid
Language
English
File Format
PDF
Word Count
35000 words
Price(USD)
1800.0
Implemented on
2019-3-1
Delivery
via email in 1 business day
Detail of CJJ/T 284-2018
Standard No.
CJJ/T 284-2018
English Name
Technical standard for mechanical pipe jacking of heating engineering
CJJ/T 284-2018 1 General provisions
1.0.1 This standard is formulated with a view to achieving advanced technology economic rationality, safety and applicability, and ensuring quality and environmental protection in the design, construction and acceptance of mechanical pipe jacking of heating engineering.
1.0.2 This standard is applicable to the design, construction and acceptance of mechanical pipe jacking of heating engineering.
1.0.3 The mechanical pipe jacking of heating engineering in frozen soil regions, collapse regions, collapsible loess regions and expansive soil regions shall meet the requirements of the current relevant standards of the nation.
1.0.4 In addition to this standard, the design, construction, and acceptance of mechanical pipe jacking of heating engineering shall also meet the requirements of the current relevant standards of the nation.
2 Terms
2.0.1 pipe jacking
trenchless pipeline construction method to jack prefabricated pipe sections from the jacking shaft to the reception shaft using hydraulic jacking equipment
2.0.2 pipe jacking with machine (mechanical pipe jacking)
pipe jacking construction method to excavate soil with a machine
2.0.3 jacking machine
mechanical equipment installed at the front end of the jacking pipeline for mechanical excavation, soil removal, guiding, steering and other operations, and able to lay pipes with the jacking device in the rear
2.0.4 working shaft
shaft used for equipment assembly and disassembly, pipe jacking, pipe section hoisting and soil removal during pipe jacking construction, including jacking and reception shafts
2.0.5 jacking shaft
shaft at the launching end of pipe jacking to place jacking equipment and jack pipes
2.0.6 intermediate jacking station
jacking facility that divides the whole pipeline into several thrust units
2.0.7 reception shaft
shaft at the end of pipe jacking to receive the jacking machine
2.0.8 reaction soil
soil bearing the reaction force of the main jacking cylinder
2.0.9 reaction wall
wall of the jacking shaft that bears the reaction force of the main jacking cylinder
2.0.10 concrete jacking base
concrete reaction wall made in the jacking shaft
2.0.11 steel plate of jacking base
steel member installed between the main jacking cylinder and the reaction wall/concrete jacking base to extend the bearing area of the reaction wall
2.0.12 guide track
track fixed on the base plate of the jacking shaft for initial guide for pipe jacking and splicing of pipe sections, or that fixed on the bottom plate of the reception shaft as the track for receiving the jacking machine
2.0.13 jacking force
force exerted by the jacking cylinder on the end of jacking pipe sections during pipe jacking construction in order to overcome jacking resistance
2.0.14 drag reduction methods
methods adopted to reduce the frictional resistance during the pipe section jacking process
2.0.15 attitude control
state control of the jacking machine in jacking process
3 Engineering geological and environmental investigations
3.1 General requirements
3.1.1 The structural design and construction of pipe jacking engineering shall be based on data obtained in the engineering geological and environmental investigations.
3.1.2 The geological and environmental investigations of pipe jacking engineering shall include drilling and geophysical exploration.
3.1.3 If there are harmful gases and other harmful substances within the pipe jacking pipeline, their distribution shall be identified and safety measures shall be taken.
3.1.4 After the engineering geological investigation is finished, exploration holes shall be plugged.
3.2 Engineering geological investigation
3.2.1 During the engineering geological investigation, the hydrogeological and geomorphological conditions, stratum structure characteristics, soil layer properties and distribution space and other conditions along the line shall be identified.
3.2.2 The drill holes for geological investigation shall meet the following requirements in terms of their locations and quantity:
1 They should be located in the working shaft and shall be arranged on the pipe jacking side; and they should not be greater than 5 m from the outer contour of the jacking pipe;
2 If the jacking pipe needs to cross railways, urban rail transit and other municipal pipelines, the position of drill holes shall not affect their normal operation;
3 At least 2 drill holes for investigation in the working shaft shall be arranged at the corners;
4 Drill holes for investigation during pipe jacking shall be arranged with an interval of 100 m–150 m for Class I sites, 50 m–100 m for Class II sites, and 30 m–50 m for Class III sites, respectively.
3.2.3 The depth of drill holes for geological investigation shall meet the following requirements:
1 The pipe jacking route shall be 3 m–5 m below the design elevation of the bottom of the jacking pipe;
2 The depth of drill holes in the working shaft shall be 5 m below the elevation of the shaft bottom;
3 If there is soft soil layer or unconsolidated backfill soil in the pipe jacking foundation, in addition to the requirements of paragraphs 1 and 2 above, the drill holes shall also be deepened;
4 If pipe jacking needs to cross a waterway, the depth of drill holes shall be 4 m–6 m below the maximum scouring depth of the riverbed, and shall meet the requirement for investigation depth below the jacking pipe bottom;
5 When there is silty fine sand in the pipe jacking foundation, which may cause flowing sand, piping or seismic liquefaction stratum, the stratum shall be drilled through;
6 When the working shaft is constructed by lowering the groundwater level, the depth of drill holes shall meet the dewatering design requirements.
3.2.4 The groundwater investigation shall meet the following requirements:
1 Groundwater types, aquifer types, burial conditions of groundwater, recharge and discharge conditions and distribution characteristics shall be investigated;
2 Highest and lowest groundwater levels on records shall be investigated;
3 The pH value of groundwater, the contents of chloride ion, calcium ion and sulfate ion, and the corrosiveness to concrete, engineering-related metal materials and rubber shall be determined;
4 When there is confined water distributed underground, its distribution range shall be investigated and its pressure shall be determined.
3.2.5 The investigation report shall include preliminary investigation report, detailed investigation report and construction investigation report, and shall meet the following requirements:
1 The preliminary investigation report shall describe the engineering geological conditions of the site and cover evaluation on the stability and adaptability of the site;
2 The detailed investigation report shall provide the physical and mechanical properties and parameters of each rock and soil layer required by the working shaft and pipe jacking interval at design and construction stages, as well as groundwater and environmental data, and shall cover analysis, evaluation, conclusions and suggestions;
Contents of CJJ/T 284-2018
1 General provisions
2 Terms
3 Engineering geological and environmental investigations
3.1 General requirements
3.2 Engineering geological investigation
3.3 Engineering environmental investigation
4 Design of plane and longitudinal-section
4.1 General requirements
4.2 Design of plane
4.3 Design of longitudinal-section
5 Action on the structure
5.1 Classification of actions
5.2 Permanent action
5.3 Variable action
5.4 Accidental action
6 Basic design regulations of pipe jacking structure
6.1 General requirements
6.2 Calculation under ultimate limit state of carrying capacity
6.3 Checking computation under the serviceability limit state
6.4 Material and durability
6.5 Design of trestles inside the jacking pipe
7 Structural design and calculation of jacking pipe
7.1 General requirements
7.2 Checking computation of nozzle carrying capacity
7.3 Calculation of pipe section internal force
7.4 Calculation of jacking pipe deformation and checking computation of anti-slip stability
7.5 Construction
8 Design of working shaft
8.1 General requirements
8.2 Jacking shaft
8.3 Reception shaft
9 Waterproof design
9.1 General requirements
9.2 Pipe jacking joint
9.3 Waterproofing of inspection well opening
10 Pipe jacking construction
10.1 General requirements
10.2 Selection of jacking machine
10.3 Construction preparation
10.4 Waterstop and shield of working shaft opening
10.5 Jacking pipe and accessories
10.6 Working shaft and reaction wall
10.7 Launching and receiving
10.8 Intermediate jacking station
10.9 Normal jacking
11 Monitoring measurement
11.1 General requirements
11.2 Monitoring items and control
11.3 Jacking direction monitoring items and control
12 Construction acceptance
12.1 General requirements
12.2 Quality acceptance
12.3 Completion acceptance
Explanation of wording in this standard
List of quoted standards
Explanation of provisions
