JGJ/T 111-1998 Technical Specification for Building and Municipal Precipitation Engineering JGJ/T111-98
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Engineering Construction Standard Full-text Information System
Industry Standard of the People's Republic of China
Technical Code for Groundwater Lowering Engineering in Building and Municipal JGJ/T111-98
1999 Beijing
Engineering Construction Standard Full-text Information System
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Industry Standard of the People's Republic of China
Technical Code for Groundwater Lowering Engineering in Building and Municipal MunicipalJGJ/T111-98
Editing unit: Comprehensive Survey, Research and Design Institute of the Ministry of ConstructionApproving department: Ministry of Construction of the People's Republic of ChinaEffective date: March 1, 1999
1999 Bei
Engineering Construction Standard Full-text Information System
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Notice on the release of the industry standard "Technical Specifications for Building and Municipal Precipitation Engineering"
Jianbiao [1998] No. 198
In accordance with the requirements of the Ministry of Construction's "Notice on Issuing the 1992 Urban Construction and Construction Engineering Industry Standard Formulation and Revision Project Plan" (Jianbiao [1992] No. 277), the "Technical Specifications for Building and Municipal Precipitation Engineering" edited by the Comprehensive Survey, Research and Design Institute of the Ministry of Construction has been reviewed and approved as a recommended industry standard, numbered JGJ/T111-98, and will be implemented on March 1, 1999.
This standard is managed and specifically interpreted by the Ministry of Construction's Survey and Geotechnical Engineering Standards and Technology Management Unit, the Ministry of Construction's Comprehensive Survey, Research and Design Institute. This standard is published by the Ministry of Construction's Standard and Quota Research Institute and China Building Industry Press.
Ministry of Construction of the People's Republic of China
October 16, 1998
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1 General Principles
2 Terms and Symbols
2.1 Terms...
2.2 Symbols
3 Basic Provisions
Classification of Precipitation Projects
General Precipitation Projects
4.2 Special Precipitation Projects
5 Precipitation Engineering survey
5.1 General provisions
Layout of survey holes (wells)·
Dewatering test·bzxz.net
Hydrogeological parameters
Special dewatering engineering survey·
6 Dewatering engineering design·
General provisions
Selection of dewatering technical methods·
Layout of dewatering wells·
Calculation of dewatering water output
Prediction of dewatering water level
Dewatering engineering implementation
General provisions
7.2 Construction and installation of dewatering wells ·
7.3 Construction procedures
7.4 Acceptance regulations·
8 Precipitation project monitoring and maintenance
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8.1 Precipitation monitoring
8.2 Precipitation maintenance
Engineering environment.
9.1 Project environmental impact prediction·
Engineering environmental impact monitoring
Engineering environmental impact prevention and control
Soil and water resources protection…
10 Technical Achievements
Appendix A
Appendix B
Classification and naming of soil
Specification table of radiant tubes
Terms used in this specification
Additional explanation
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1.0.1 This specification is formulated to make all kinds of precipitation projects technologically advanced, safe and reliable, economically reasonable, and ensure quality; and to correctly handle the relationship with foundation engineering, water and soil resources, environmental protection, and engineering environment.
2 This specification is applicable to newly built, rebuilt, and expanded buildings and municipal precipitation projects. 1.0.3 Precipitation survey data should be available for buildings and municipal precipitation projects. Without complete survey data, precipitation design shall not be carried out, and without precipitation design, precipitation project construction shall not be carried out. When the existing engineering survey data cannot meet the precipitation design, additional survey should be carried out.
1.0.4 The design of dewatering engineering should select the best dewatering scheme to lower the groundwater level to the dewatering depth required by the building and municipal engineering, and demonstrate the environmental impact of the project. When it is predicted that there may be harm to the environment, corresponding prevention and control measures should be proposed. 1.0.5
5 In addition to complying with this specification, dewatering projects for buildings and municipalities should also comply with the provisions of the relevant current national standards.
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2Terms and Symbols
2.1Terms
2.1.1Dewatering EngineeringDewatering engineering refers to the application of hydrogeological principles, through dewatering design and dewatering construction, to remove surface water and reduce the water level of groundwater such as stagnant water, groundwater, confined water, bedrock water, karst water, etc. in the stratum, to meet the dewatering depth and time requirements of the construction project, and have no harmful impact on the engineering environment.
2.1.2 Dewatering geological condition refers to the general term for hydrogeological, engineering geological, environmental geological and other conditions related to dewatering projects.
2.1.3 Dewatering prospecting refers to the investigation conducted to clarify the geological conditions of dewatering projects and meet the needs of dewatering projects.
4 Dewatering geological parameters 2.1.4
Includes hydrogeological parameters, engineering geological parameters, environmental geology, engineering environment and other related parameters.
2.1.5 Dewatering depth groundwater level after lowering The depth from the ground to the dynamic water level required by the design below the bottom of the foundation pit. 2.1.6 Detained ground water refers to the upper stagnant water, gravity water in the weak aquifer above the phreatic level and interlayer water replenished by artificial leakage.
2.1.7 Yieldwaterduringlowering refers to the total amount of water extracted from the aquifer by the dewatering well. 2.1.8 Dewatering point well refers to a dewatering well with a diameter close to 100mm. According to different pumping principles and methods, it can be divided into vacuum point wells, jet point wells, and electroosmosis point wells. 2.1.9 Vacuum point wells are wells that draw groundwater after vacuum is created by the operation of vacuum pumps, jet pumps, and reciprocating pumps. They can be divided into single-stage point wells (vertical, horizontal, inclined), multi-stage point wells, and relay point wells.
2.1.10 Multi-stage point wells When a single-stage point well cannot meet the requirements of the foundation pit dewatering depth, point wells can be designed separately on different elevation platforms on the foundation pit slope. It forms a multi-stage point well to increase the depth of precipitation.
Relay point well
When the single-stage precipitation cannot reach the precipitation depth, in addition to the vacuum pump, the jet pump and the jet pump can be used in combination. In the lower section, the jet point well equipment is used to pump the groundwater to the upper section of the well, and then the groundwater is sent to the circulating water tank by the jet pump at the wellhead section to ensure continuous operation;
2.1.12 Ejector point well After the high-pressure water is transported to the bottom of the well through the gap between the inner and outer pipes of the point well pipe, it is sprayed upward at high speed by the jet nozzle, causing negative pressure, sucking groundwater and air, and mixing with the working water to form a gas-water solution with upwelling potential energy and discharged to the surface, achieving the purpose of lowering the groundwater level. 2.1.13 Electro-drainage point well: Using electric field, a metal rod is inserted into the ground as an anode, so that the positively charged water molecules (free water and bound water) in the weak aquifer move toward the cathode point and are discharged by the pump.
2.1.14 Self-absorbing well: Gravity water infiltrates into the lower aquifer by itself or by pumping through a bare well without a tube or a well without a pump. It is divided into self-absorbing well and self-absorbing well. 2.1.15Buried well
During dewatering construction, if a certain height of groundwater remains at the bottom of the foundation pit or culvert, the pumping well is buried below the designed dewatering depth to pump water, so that the groundwater level is lowered to meet the requirements of the designed dewatering depth.
2.1.16Dewatering experiment dewatering experiment Engineering Construction Standard Full Text Information System
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Before dewatering construction, a pumping test, a seepage test or a water injection test is carried out to determine the hydrogeological parameters or other parameters: to check the dewatering effect, determine the engineering parameters, and provide tests for analyzing and adjusting the dewatering plan.
Dewatering engineering inspection
Engineering Dewatering inspection refers to the operation of all dewatering wells and drainage facilities after dewatering construction, and the overall effect of the dewatering plan is tested. After meeting the dewatering design requirements and being stable for 24 hours, the dewatering monitoring and maintenance stage is entered.
Engineering environment
engineeringenvironment
refers to the environmental impact of engineering construction and engineering construction, and the restrictive effects of natural environment, artificial environment and social environment on engineering construction and engineering construction. Through investigation, prediction, prevention and control, and management, the goal of sustainable development of construction projects can be achieved. 2.2 Symbols
The basic symbols of precipitation engineering should comply with the provisions of Table 2.2.1. Basic symbols
Pressure conductivity
Foundation width
Leakage coefficient
Well (hole) diameter
Inner diameter of pipe
Thickness of submerged aquifer
Static water level
Well depth
Dynamic water level
Deep water level
Dynamic water level of pumping well
Head difference
Vertical permeability
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m, mm
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Self-seepage well length
Filter length
Filter submerged section length
Thickness of pressure aquifer
Pollution index
Water output
Dewatering and water discharge capacity
The distance from the first pumping to the observation hole or calculation pointEquivalent radius of the foundation pit
Water level drawdown value
Water level drawdown in the dewatering well
Dewatering depth
Water level drawdown in the observation hole
Water level drawdown at any distance and any timeElastic water release coefficient of pressurized water, equivalent water conductivity of diving
And the quality collection is constant "one—
And function, same [—Bi(a)]
Nominal pipe or wire diameter
Water supply degree of diving
Empirical coefficient related to the permeability coefficient of the aquiferEngineering construction standard full text information system
d,h,min,s
m,d,mm
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3 Basic provisions
3.0.1 Dewatering projects should be divided into six basic procedures: preparation stage, engineering survey, dewatering project design, dewatering project construction, dewatering project monitoring and maintenance, and technical achievements. 3.0.2 Dewatering project preparation should include the following contents: 1 Clarify task requirements:
(1) Dewatering range, depth, start and end time and engineering environment requirements; (2) Understand and master the plan and surface drawings of building foundations, underground pipelines, and culvert projects; ground elevation and foundation bottom elevation; foundation pit (trench), culvert support and excavation design; adjacent buildings and underground pipelines Plan position, foundation structure and layout conditions, etc. 2 Collect hydrogeological, engineering geological, engineering survey and other information on the dewatering project site and adjacent areas. , and engineering precipitation examples. 3 Conduct precipitation engineering site surveys, collect precipitation engineering surveys, precipitation engineering construction water supply, power supply, roads, drainage and obstacles and other on-site construction conditions. 3.0.3 Engineering surveys should meet the precipitation engineering design requirements. When they cannot meet the precipitation engineering design requirements, additional precipitation engineering surveys should be conducted. 3.0.4 Precipitation engineering design and construction should carry out information construction activities from beginning to end to improve the precipitation engineering design level and precipitation engineering construction quality. 3.0.5 Precipitation engineering design and precipitation engineering construction should be equipped with engineering rescue auxiliary measures to ensure the smooth progress of precipitation engineering.
3.0.6 After the precipitation construction is completed, it must be inspected for precipitation engineering, and the precipitation engineering monitoring and maintenance stage can be entered only after the precipitation design depth is met. 3.0.7 Precipitation engineering data should be analyzed and sorted out in a timely manner, including precipitation engineering surveys, precipitation engineering design, precipitation engineering construction, precipitation engineering monitoring and maintenance, and engineering environment as the main content of technical achievements.
3.0.8 The classification and naming of Quaternary soils shall comply with the provisions of Appendix A. Engineering Construction Standard Full-text Information System
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4 Classification of precipitation projects
4.1 General precipitation projects
Architecture and municipal general precipitation projects shall be classified according to the foundation type, foundation pit (trench) precipitation depth, aquifer characteristics, engineering environment and complexity of site type, and determined according to Table 4.1.1.
Complexity classification of general precipitation projects
Complexity classification
Strip (m)
Surface F (m2)
Precipitation depth S△ (m)
Aquifer characteristics
K (m/a)
Engineering environmental impact
Site type
R<5000
0.1≤K<20.0
No strict requirements
Type of site, auxiliary engineering
Simple engineering measures
50001 Dewatering projects should be divided into six basic procedures: preparation, engineering survey, dewatering project design, dewatering project construction, dewatering project monitoring and maintenance, and technical achievements. 3.0.2 Dewatering project preparation should include the following: 1 Clearly define task requirements:
(1) Dewatering range, depth, start and end time, and engineering environment requirements; (2) Understand and master the plan and surface drawings of building foundations, underground pipelines, and culvert projects; ground elevation and foundation bottom elevation; foundation pit (trench), culvert support and excavation design; plane position, foundation structure, and layout conditions of adjacent buildings and underground pipelines. 2 Collect hydrogeological, engineering geological, engineering survey and other data on the dewatering project site and adjacent areas, as well as engineering dewatering examples. 3 Conduct a site survey for the dewatering project, and collect on-site construction conditions such as water supply, power supply, roads, drainage, and obstacles for dewatering project survey and dewatering project construction. 3.0.3 Engineering survey shall meet the requirements of precipitation engineering design. When it cannot meet the requirements of precipitation engineering design, supplementary precipitation engineering survey shall be carried out. 3.0.4 The design and construction of precipitation engineering shall carry out information construction activities from beginning to end to improve the design level of precipitation engineering and the quality of precipitation engineering construction. 3.0.5 The design and construction of precipitation engineering shall be equipped with engineering rescue auxiliary measures to ensure the smooth progress of precipitation engineering.
3.0.6 After the precipitation construction is completed, it must be inspected by precipitation engineering. Only after the precipitation design depth is met can the precipitation engineering monitoring and maintenance stage be entered. 3.0.7 The precipitation engineering data shall be analyzed and sorted out in a timely manner, including the technical achievements with precipitation engineering survey, precipitation engineering design, precipitation engineering construction, precipitation engineering monitoring and maintenance and engineering environment as the main contents.
3.0.8 The classification and naming of Quaternary soil shall comply with the provisions of Appendix A. Engineering Construction Standard Full-text Information System
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4 Classification of Dewatering Projects
4.1 General Dewatering Projects
Building and Municipal General dewatering projects should be classified according to the foundation type, foundation pit (trench) dewatering depth, aquifer characteristics, engineering environment and complexity of site type, and determined according to Table 4.1.1.
Complexity classification of general precipitation projects
Complexity classification
Strip (m)
Surface F (m2)
Precipitation depth S△ (m)
Aquifer characteristics
K (m/a)
Engineering environmental impact
Site type
R<5000
0.1≤K<20.0
No strict requirements
Type of site, auxiliary engineering
Simple engineering measures
50001 Dewatering projects should be divided into six basic procedures: preparation, engineering survey, dewatering project design, dewatering project construction, dewatering project monitoring and maintenance, and technical achievements. 3.0.2 Dewatering project preparation should include the following: 1 Clearly define task requirements:
(1) Dewatering range, depth, start and end time, and engineering environment requirements; (2) Understand and master the plan and surface drawings of building foundations, underground pipelines, and culvert projects; ground elevation and foundation bottom elevation; foundation pit (trench), culvert support and excavation design; plane position, foundation structure, and layout conditions of adjacent buildings and underground pipelines. 2 Collect hydrogeological, engineering geological, engineering survey and other data on the dewatering project site and adjacent areas, as well as engineering dewatering examples. 3 Conduct a site survey for the dewatering project, and collect on-site construction conditions such as water supply, power supply, roads, drainage, and obstacles for dewatering project survey and dewatering project construction. 3.0.3 Engineering survey shall meet the requirements of precipitation engineering design. When it cannot meet the requirements of precipitation engineering design, supplementary precipitation engineering survey shall be carried out. 3.0.4 The design and construction of precipitation engineering shall carry out information construction activities from beginning to end to improve the design level of precipitation engineering and the quality of precipitation engineering construction. 3.0.5 The design and construction of precipitation engineering shall be equipped with engineering rescue auxiliary measures to ensure the smooth progress of precipitation engineering.
3.0.6 After the precipitation construction is completed, it must be inspected by precipitation engineering. Only after the precipitation design depth is met can the precipitation engineering monitoring and maintenance stage be entered. 3.0.7 The precipitation engineering data shall be analyzed and sorted out in a timely manner, including the technical achievements with precipitation engineering survey, precipitation engineering design, precipitation engineering construction, precipitation engineering monitoring and maintenance and engineering environment as the main contents.
3.0.8 The classification and naming of Quaternary soil shall comply with the provisions of Appendix A. Engineering Construction Standard Full-text Information System
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4 Classification of Dewatering Projects
4.1 General Dewatering Projects
Building and Municipal General dewatering projects should be classified according to the foundation type, foundation pit (trench) dewatering depth, aquifer characteristics, engineering environment and complexity of site type, and determined according to Table 4.1.1.
Complexity classification of general precipitation projects
Complexity classification
Strip (m)
Surface F (m2)
Precipitation depth S△ (m)
Aquifer characteristics
K (m/a)
Engineering environmental impact
Site type
R<5000
0.1≤K<20.0
No strict requirements
Type of site, auxiliary engineering
Simple engineering measures
5000
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