GBJ 85-1985 Technical Specification for Sprinkler Irrigation Engineering GBJ85-85
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Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Technical Specification for Sprinkler Irrigation Engineering
GBJ85-85
1986Beijing
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National Standard of the People's Republic of China
Technical Specification for Sprinkler Irrigation Engineering
Editor Department: Ministry of Water Resources and Electric Power of the People's Republic of ChinaApproval Department: State Planning Commission of the People's Republic of ChinaImplementation Date: 19 July 1, 1986 Engineering Construction Standards Full Text Information System
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Notice on the Release of "Technical Specifications for Sprinkler Irrigation Projects" Planning Standards [1985] No. 2034
To the Planning Commissions (Construction Commissions, Construction Departments) of all provinces, autonomous regions, and municipalities directly under the Central Government, and all relevant ministries and directly affiliated units of the State Council:
According to the requirements of the Notice No. (83) Jingjishezi No. 12 of the former State Economic Commission's Capital Construction Office, the "Technical Specifications for Sprinkler Irrigation Projects" jointly compiled by the Ministry of Water Resources and Electric Power and relevant units has been reviewed by relevant departments. The "Technical Specifications for Sprinkler Irrigation Projects" GBJ85-85 is now approved as a national standard and will be implemented from July 1, 1986. This specification is managed by the Ministry of Water Resources and Electric Power, and its specific interpretation and other work are the responsibility of the Graduate School of Beijing Institute of Water Resources and Electric Power Economics and Management. The publication and distribution is organized by the Capital Construction Standards and Norms Research Institute of our Commission.
State Planning Commission
December 10, 1985
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Preparation Instructions
The "Technical Specifications for Sprinkler Irrigation Engineering" was compiled by the Graduate School of Beijing Institute of Water Resources and Electric Power Economics and Management (formerly the Beijing Graduate School of North China Institute of Water Resources and Hydropower) and Wuhan Institute of Water Resources and Electric Power in conjunction with 26 relevant units in accordance with the letter (83) No. 12 of the former State Economic Commission's Capital Construction Office. During the preparation process, the preparation team went deep into more than 20 provinces and cities, conducted field investigations and research on more than 100 sprinkler irrigation projects, and summarized the achievements and experiences of sprinkler irrigation research and production practice in my country in the past decade; referred to relevant international standards and foreign advanced standards, carried out scientific research and experimental verification on major technical issues, held four special seminars and technical appraisal meetings, and coordinated with the relevant national standard authorities on technical content: after the draft for comments was completed, it was sent to more than 300 units and individuals, and entrusted the water conservancy authorities of seven provinces and cities with large sprinkler irrigation areas to hold seminars respectively, and listened to opinions more widely. Some provinces also combined sprinkler irrigation projects with test designs and tried them out during construction according to the requirements of the specification. Finally, a national review meeting was held to jointly review and finalize the draft with relevant departments.
This specification is divided into chapters, 25 sections, 126 articles and three appendices. Its main contents include: general principles, overall design of sprinkler irrigation projects, sprinkler irrigation technical parameters, pipeline hydraulic calculations, equipment selection and engineering facilities, engineering construction, equipment installation, pipeline water pressure test and engineering acceptance.
In the process of implementing this specification, we hope that all units will pay attention to summarizing experience and accumulating data. If you find that there are places that need to be modified and supplemented, please send specific opinions and reference materials to the Graduate School of Beijing Institute of Water Resources and Electric Power Economics and Management, Xiwai Huayuan Village, Beijing, for reference when revising the specification.
Ministry of Water Resources and Electric Power
September 1985
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Main Symbols
Irrigation System
Design Irrigation Quota, Flow Index
-Soil Bulk Density
h-Planned Wetting Layer Depth, Spraying Water Depth△——Average Deviation of Spraying Water Depth
B1——Upper limit of suitable soil moisture content (weight percentage) β2——Lower limit of suitable soil moisture content (weight percentage) T
Design irrigation cycle, time
Daily water demand, pipeline water release
Flow, speed and acceleration
Design flow of sprinkler system, flow
4——Nozzle flow
-Actual seepage of 1000-meter-long pipeline
-Allowable seepage of 1000-meter-long pipeline
Pipeline flow rate
Water hammer wave propagation speed
-Gravity acceleration
Pressure, head and loss
Pmaz——Maximum gauge pressure
h,——Sprinkler working pressure head
H——Sprinkler system design head
H2—Design head at the head end of the self-pressure sprinkler branch h,——Head loss along the pipeline
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h,——Local head loss in pipeline
hf——Head loss along branch pipe
h——Local head loss in branch pipe
h——Head loss along branch pipe with multiple nozzles
Geometric characteristics
d——Diameter of main nozzle of nozzle, inner diameter of pipe
S——Spraying area
Zd——Ground elevation of typical spraying point
Z. ——Water source water surface elevation
Z——Ground elevation of the head end of the branch pipe
-Vertical pipe height
Nominal inner diameter of the pipe
Average outer diameter of the pipe
Minimum wall thickness of the pipe
Number, coefficient and index
Water utilization coefficient of a sprinkler
Cu——Sprinkler irrigation uniformity coefficient
Number of measuring points, number of sprinklers working at the same time
Yu——Friction coefficient
6—— Pipe diameter index
F——Multiple-port coefficient
N——Number of nozzles or orifices
X——Position coefficient of the first hole of the multi-hole branch
s——Local resistance coefficient
Temperature correction coefficient of plastic pipe
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KsPipeline water seepage coefficient
R—Nozzle range
T. ——Valve closing time
. ——Instantaneous burst hoop stress of plastic pipe t—Test temperature
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Chapter 1 General Provisions
Chapter 2 Overall Design of Sprinkler Irrigation Project
Section 1 General Provisions·
Section 2 Water Source Analysis and Calculation·
Chapter 3 Sprinkler Irrigation Technical Parameters
Chapter 4
Pipeline Hydraulic Calculation
Section 1
Design Flow and Design Head
Section 2
Section 3
Chapter 5
Head loss calculation
Water hammer pressure verification
Equipment selection and engineering facilities
Section 1
Section 3
Section 4
Chapter 6
Equipment selection
Water source project
Project construction
Section 1
Section 2
Section 3
Section 4
Chapter 7
General provisions
Water source project construction
Pump station construction
Pipeline network construction
Equipment Installation
Section 1
Section 2
Section 3
Section 4
Section 5
Section 6
General Provisions
Electrical and Mechanical Equipment Installation
Metal Pipe Installation
Plastic Pipe Installation
Cement Product Pipe Installation
Vertical Pipe and Sprinkler Installation
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Chapter 8 Pipeline Water Pressure Test
Section 1 General Provisions
Section 2 Section Water Pressure Test
Section 3 Water Seepage Test
Chapter 9 Project Acceptance
Section 1
Section 2
Section 3
Appendix 1
Appendix 2
Appendix 3
Additional Notes
General Provisions
Acceptance during Construction
Acceptance after Completion
Glossary
Explanation of Terms Used in This Code
Comparison and Conversion Table between Legal Measurement Units and Conventional Non-legal Measurement Units
Electrical Engineering
0060 34
List of the editorial units, participating units and main drafters of this specification
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Chapter 1 General
Section 1.0.Article 1 The construction of sprinkler irrigation projects must conscientiously implement the national technical and economic policies, adapt to local conditions, make full use of existing water conservancy facilities, save energy, carry out comprehensive utilization, and be practical, technologically advanced, economically reasonable, safe and applicable. Article 1.0.2 This specification applies to the design, construction, installation and acceptance of sprinkler irrigation projects in agriculture, forestry, animal husbandry and gardens. Article 1.0.3 The design, construction, installation and acceptance of sprinkler irrigation projects, in addition to complying with the provisions of this specification, shall also comply with the provisions of the current relevant standards and specifications. Engineering Construction Standards Full-text Information System
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Chapter 2 Overall Design of Sprinkler Irrigation Projects
Section 1 General Provisions
Article 2.1.1 The overall design of sprinkler irrigation projects shall be determined through technical and economic comparisons based on the topography, soil, meteorology, hydrology and hydrogeology, crop planting and social and economic conditions of the irrigation area.
Article 2.1.2 The overall design of the sprinkler irrigation project shall comply with the requirements of farmland water conservancy planning and shall be combined with the drainage, road, forest belt, power supply and other systems as well as the planning of residential areas.
Article 2.1.3 Sprinkler irrigation projects may adopt one or more systems based on the principle of adapting measures to local conditions. The type of sprinkler irrigation system shall be determined by comprehensive comparison considering the following factors: 1. Type and location of water source:
2. Irrigation area, shape and distribution of land plots; 3. Topography;
4. Crop types;
5. Economic conditions and labor conditions;
6. Energy conditions and equipment and material supply conditions; 7. Production management system and technical strength; 8. Comprehensive utilization requirements.
Section 2 Water Source Analysis and Calculation
Article 2.2.1 The overall design of the sprinkler irrigation project must analyze and calculate the water source and water volume. For sprinkler irrigation systems supplied by completed water conservancy projects, the design annual water supply flow shall be determined based on the original design and application of the project. For newly built water source projects, the water supply flow rate should be calculated and determined based on the water source type and survey data. Article 2.2.2 When the sprinkler water source is river runoff, the water volume of the water source should be calculated according to the following requirements:
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1. When there is a long series of runoff data, the annual runoff volume and its annual distribution and average flow rate during the critical irrigation period that meet the design frequency should be deduced through frequency calculation. 2. When there is less runoff data, the runoff data should be interpolated and extended through correlation analysis methods, and then the above-mentioned runoff characteristic values should be deduced through frequency calculation. 3. When there is no measured data, a reference station can be selected to deduce the runoff series through conversion, interpolation or runoff coefficient method. It is also possible to refer to regional hydrological manuals or atlases and combine survey data to deduce runoff characteristic values.
Article 2.2.3 When the sprinkler irrigation water source is local surface runoff, the annual runoff of the design frequency can be determined by referring to the regional hydrological manual or atlas and combining the survey data. Article 2.2.4 When the sprinkler irrigation water source is groundwater, the water source volume should be determined based on the existing hydrogeological data, the groundwater exploitation conditions in the region should be analyzed, and the water output of the adjacent machine wells should be investigated. For areas without hydrogeological data, exploration wells should be drilled and the water source volume should be determined through pumping tests.
Article 2.2.5 The overall design of the sprinkler irrigation project must balance the calculation of the water source water volume and the sprinkler irrigation water volume. When the natural water flow process of the water source cannot meet the sprinkler irrigation water requirements, a water storage project should be built.
Article 2.2.6 The sprinkler irrigation water quality should comply with the provisions of the current "Agricultural Irrigation Water Quality Standards".
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