GBJ 69-1984 Code for Structural Design of Water Supply and Drainage Engineering GBJ69-84
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Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Code for Structural Design of Water Supply and Drainage Projects
1984 Beijing
Engineering Construction Standard Full-text Information System
W Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Code for Structural Design of Water Supply and Drainage Projects
Editor Department: Beijing Capital Construction Committee Approval Department, State Planning Commission of the People's Republic of China Implementation Date: January 1, 1985| |tt||Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Notice on the Release of "Design Code for Structure of Water Supply and Drainage Engineering"
Ji Biao [1984] No. 1440
According to the Notice No. 562 of the former State Construction Commission (78) Jianfa Shezi, the "Design Code for Structure of Water Supply and Drainage Engineering" compiled by the Beijing Municipal Construction Commission and jointly compiled by the Beijing Municipal Municipal Design Institute and the design institutes, colleges and universities of relevant departments has been reviewed by relevant departments. The "Design Code for Structure of Water Supply and Drainage Engineering" BGJ69-84 is now approved as a national standard. It will be implemented on January 1, 1985. This code is managed by the Beijing Municipal Construction Commission, and its specific interpretation and other work are the responsibility of the Beijing Municipal Design Institute.
State Planning Commission
July 13, 1984
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Engineering Construction Standards Full-text Information System
Preparation Instructions
This specification is prepared by our Commission in accordance with the requirements of the Notice No. 562 of the former State Construction Commission (78) Jianfashezi, and the Beijing Municipal Engineering Design Institute is entrusted to preside over the specific preparation work. It is jointly prepared by the Ministry of Railways Professional Design Institute, Wuhan Iron and Steel Design Institute of the Ministry of Metallurgy, the Second Design Institute of the Ministry of Chemical Industry, China Municipal Engineering Southwest Design Institute, China Municipal Engineering Northwest Design Institute, China Water Supply and Sewerage Central South Design Institute, China Water Supply and Sewerage Northeast Design Institute, Shanghai Municipal Engineering Design Institute, Tianjin Municipal Engineering Survey and Design Institute, Nanjing Institute of Technology, Beijing University of Technology and Beijing Institute of Civil Engineering. In the process of compiling this specification, we implemented the relevant policies and guidelines of my country's socialist modernization construction, adhered to the working methods of practice first and mass line, conducted a lot of investigations and studies, carefully summarized the engineering practice experience of various regions in my country, carried out necessary scientific experiments, absorbed the corresponding useful experience of foreign countries, and widely solicited opinions from relevant design, construction, scientific research and colleges and universities across the country. Finally, our committee reviewed and finalized the draft together with relevant departments. This specification is divided into seven chapters and seven appendices. Its main contents include: general principles, basic regulations, structural design regulations for water supply and drainage projects such as pools, pump houses, water towers, caissons and underground pipelines.
In view of the fact that this specification is compiled for the first time, in the process of implementation, please combine engineering practice, carefully summarize experience, and pay attention to accumulating data. If you find that there is a need for modification and supplementation, please send your opinions and materials to Beijing Municipal Design Institute for reference in future revisions.
Beijing Capital Construction Committee
January 26, 1984
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Chapter I General Provisions
Chapter II
Basic Provisions
Section I Materials
Section II
Section III
Section IV
Chapter III
Basic Calculations
General Structural Requirements
Section I
General Provisions
Section II
Static Calculation of Rectangular Pools·
Section III
Section IV
Chapter IV
Static Calculation of Circular Pools……
Structural Requirements
Pump Room and Water Intake Head|| tt||Section 1
Section 2
Section 3
Chapter 5
General Provisions
Static Calculation
Construction Requirements
Section 1
General Provisions
Section 2
Static Calculation
Section 3
Construction Requirements
Chapter 6
Section 1
- General provisions
Section 2
Static calculation of circular caissons·
Static calculation of rectangular caissons
Section 3
Section 4
Structural requirements
Chapter 7
Section 1
General provisions
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Engineering Construction Standards Full-text Information System
Section 2 Steel pipes.
Section 3 Cast Iron Pipes
Section 4 Prestressed Concrete Circular Pipes…Section 5 Rectangular and Arched Pipes
Electricity and Electricity
Section 6 Concrete and Reinforced Concrete Circular Pipes·Appendix 1
Appendix 2
Edge reaction coefficient of two-way plates supported by four-side hinges under uniform, triangular loads or edge bending moments…69
Edge reaction coefficient of two-way plates with three sides fixed and free top under uniform or triangular loads·
Bending moment coefficient of two-way loaded wall plates under wall temperature difference or humidity equivalent temperature difference as Appendix 3
Appendix 4 Bending moment coefficient and edge reaction coefficient of two-way plates under non-top water (soil) pressure
Bending moment coefficient, axial force coefficient and variable moment coefficient of steel pipes Appendix 5 of position coefficient
Appendix 6 Bending moment coefficient of circular rigid pipe under various loads 91.92
Appendix 7 Explanation of terms used in this specification
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Engineering Construction Standard Full-text Information System
Basic symbols
Loads and internal forces
-Bending moment (arbitrary subscript);
N. Axial force;
Po——single wheel pressure of ground vehicle
Pa——flowing water pressure;
P Ice pressure,
-Wind load on the water tank of a water tower;
PA——active earth pressure;
-Buoyancy of groundwater;
Design internal water pressure of the pipeline;
Q: shear force;Www.bzxZ.net
R:——The foundation reaction force at the bottom of the caisson blade. Stress
The stress of the tensile steel bar,
The normal stress of the concrete caused by prestressing and external load;-The tension control stress of the prestressed steel bar;-The tensile stress on the cross section of the cast iron pipe under the design internal water pressure; Q
-The stress loss of the prestressed steel bar,
-The bending stress on the cross section of the cast iron pipe under the external pressure;-The longitudinal stress of the steel pipe;
The stress of the prestressed steel bar after deducting the prestress loss at the corresponding stage,-The hoop stress of the steel pipe.
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Engineering Construction Standard Full-text Information System
Material Index
-The elastic modulus of the soil;
Eo——The deformation modulus of the soil;
E. —Elastic modulus of steel bars;
—Elastic modulus of concrete;
—Compression modulus of soil;
Shear modulus of concrete;
Design strength for cracking of concrete;
Design strength for tensile strength of concrete;
Ultimate tensile strength of cast iron pipe;
Ultimate bending tensile strength of cast iron pipe;
Poisson's ratio of soil;
Poisson's ratio of steel,
Poisson's ratio of concrete.
Geometric characteristics
Area of a cross section;
Calculated width of column cap;
Distance from the elastic center of the circular arch to the toe of the arch; inner diameter
Calculated diameter;
Outer diameter;
Core thickness of prestressed concrete circular tube; steel bar diameter; eccentric moment,
height;
thickness;
Sectional moment of inertia;
radius;
Calculated depth and height.
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Engineering Construction Standard Full-text Information System
Calculation coefficient
3—Calculation stiffness of reinforced concrete components; B-
Thrust stiffness of a component;
Strength design safety factor;
Component positive section anti-cracking design safety factor;-caisson sinking coefficient;
Design stability safety factor;
Bending moment coefficient of plate;
High-order influence coefficient of additional bending moment of water tower; Steel pipe Moment coefficient, axial force coefficient, body coefficient of water head; ratio of elastic modulus of steel bar to elastic modulus of concrete; vertical earth pressure coefficient;
-linear expansion coefficient;
heat exchange coefficient;
reinforcement ratio, friction coefficient;
-active earth pressure coefficient;
-steel surface shape coefficient;
y-section resistance moment plasticity coefficient;
b-uneven strain coefficient of tensile steel bar between cracks of components; n
-temperature stress reduction coefficient.
△t-wall temperature difference;
-natural bulk density of original soil;
y. -bulk density of backfill soil,
\. -floating bulk density of backfill soil;
-bulk density of water,
f-crack width.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 1 General
Article 1.0.1 In order to achieve advanced technology, economic rationality, safety and applicability, and ensure quality in the structural design of water supply and drainage projects, this specification is specially formulated. Article 1.0.2 This specification is applicable to the structural design of general water supply and drainage engineering facilities in urban and town public facilities and industrial enterprises, and is not applicable to the structural design of water supply and drainage engineering facilities with special requirements in industrial enterprises. Article 1.0.3 Water storage or water treatment structures and underground structures should generally adopt reinforced concrete structures; when the capacity is small, masonry structures can be used. In areas where the average temperature of the coldest month is lower than -5℃, exposed water storage or water treatment structures and the inlet and outlet sections of underground pipelines shall not adopt brick structures. Article 1.0.4 When designing according to this specification, the determination of general loads, calculation of component sections and foundation design shall be carried out in accordance with the provisions of the corresponding national standards and specifications. For the structural design of water supply and drainage projects built in earthquake zones, collapsible loess or expansive soil areas, the current relevant national standards and specifications shall still be met. Engineering Construction Standards Full-text Information System
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Chapter II
Basic Provisions
Section I Materials
Article 2.1.1 The concrete grade of water storage or water treatment structures and underground structures shall not be less than No. 200.
Article 2.1.2 The design strength of ordinary concrete shall be adopted in accordance with the provisions of "Design Code for Reinforced Concrete Structures" TJ10-74. The design strength of concrete formed by centrifugal mechanism, hanging roller and vibration extrusion shall be adopted based on the data provided by the test.
Article 2.1.3 The impermeability of reinforced concrete structures should meet the impermeability requirements with the compactness of the concrete itself. The impermeability grade of concrete should be determined by test and meet the requirements of Table 2.1.3.
Note: Due to equipment limitations, when the test of concrete impermeability is difficult, the requirements for concrete impermeability should meet the following requirements: water-cement ratio should not be greater than 0.55; ordinary silicate cement should be used; aggregate should be well graded, and cement dosage should be strictly controlled. When No. 325 cement (equivalent to No. 400 original hardened cement) is used, cement dosage should not exceed 360 kg/m3, and cement dosage of prestressed concrete can be increased by 50 kg/m3 as control value.
Permissible value of concrete impermeability
Ratio of maximum water head to concrete thickness () <10
Impermeability (&)
Note: The definition of impermeability S: refers to concrete specimens with an age of 28 days, which meet the water-impermeability index after applying kg/cm2 water pressure.
Article 2.1.4 Engineering Construction Standard Full Text Information System for Water Storage or Water Treatment Structures, Underground Structures and Pipelines
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Concrete, when meeting the requirements of anti-seepage, generally does not need other anti-corrosion treatment: Concrete in contact with corrosive media with a pH value lower than 6.0 should be determined according to the current relevant specifications or through special tests. Article 2.1.5 In areas where the average temperature of the coldest month is lower than -5°C, the concrete of exposed reinforced concrete structures should be guaranteed to have good anti-freeze performance. The anti-freeze grade of the concrete should be determined through tests and should meet the requirements of Table 2.1.5. Note: When it is difficult to test the anti-freeze grade of concrete due to equipment conditions, concrete with a grade not less than 250 should be used, and it should meet the requirements of water-cement ratio and cement dosage in the notes to Article 2.1.3 of this specification.
Allowable value of concrete frost resistance grade (D)
Structural category
Climate conditions
Working conditions
Average temperature of the coldest month is lower than -15℃
Average temperature of the coldest month is between -5 and -15℃
Head of surface water intake
Total number of freeze-thaw cycles
Head of surface water intake
Part above the water level fluctuation zone
Position and exposed pools, etc.
Note: ①Concrete frost resistance grade D: refers to concrete specimens with an age of 28 days. After one action of the corresponding total number of freeze-thaw cycles, its strength reduction is not more than 25%, and its weight loss does not exceed 5%. ②The temperature should be determined based on the actual measured data for more than 5 consecutive years and its average value is calculated. ③The total number of freeze-thaw cycles refers to the number of alternating times in one year when the temperature drops from above +5℃ to below -5℃ and then rises back to above +5℃. For the surface water intake head, the number of freeze-thaw cycles caused by water level fluctuations during the period when the monthly average temperature is lower than -5°C in a year should also be considered. At this time, each rise and fall of the water level should be calculated as one freeze-thaw cycle.
Article 2.1.6 Concrete for water storage or water treatment structures, underground structures and pipelines shall not use chloride salts as antifreeze and early hardening admixtures; the use of other admixtures shall be determined based on test identification to determine their applicable performance and corresponding admixture amounts. Article 2.1.7 Brick and stone masonry materials for water storage or water treatment structures, underground structures and pipelines shall meet the following requirements: 1. Bricks shall be ordinary clay machine bricks, and the grade shall not be lower than 75. 2. The grade of stone shall not be lower than 200.
3. Masonry mortar shall be cement mortar.
Article 2.1.8 The Poisson's ratio (μ) of concrete can be 1/6. Engineering Construction Standard Full-text Information System
W3The Poisson's ratio (μ) of 8 concrete can be 1/6. Engineering Construction Standard Full Text Information System
W3The Poisson's ratio (μ) of 8 concrete can be 1/6. Engineering Construction Standard Full Text Information System
W355; Ordinary Portland cement is suitable for cement; Aggregates should be well graded and cement dosage should be strictly controlled. When No. 325 cement (equivalent to No. 400 hardened cement) is used, cement dosage should not exceed 360 kg/m3. The cement dosage of prestressed concrete can be increased by 50 kg/m3 as the control value.
Permissible value of concrete anti-seepage grade
Ratio of maximum action head to concrete thickness () <10
Anti-seepage grade (&)
Note: The definition of anti-seepage grade S: refers to concrete specimens with an age of 28 days, which meet the water-impermeability index after applying kg/cm2 water pressure.
Article 2.1.4 Engineering Construction Standard Full Text Information System for Water Storage or Water Treatment Structures, Underground Structures and Pipelines
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Concrete, when meeting the requirements of anti-seepage, generally does not need other anti-corrosion treatment: Concrete in contact with corrosive media with a pH value lower than 6.0 should be determined according to the current relevant specifications or through special tests. Article 2.1.5 In areas where the average temperature of the coldest month is lower than -5°C, the concrete of exposed reinforced concrete structures should be guaranteed to have good anti-freeze performance. The anti-freeze grade of the concrete should be determined through tests and should meet the requirements of Table 2.1.5. Note: When it is difficult to test the anti-freeze grade of concrete due to equipment conditions, concrete with a grade not less than 250 should be used, and it should meet the requirements of water-cement ratio and cement dosage in the notes to Article 2.1.3 of this specification.
Allowable value of concrete frost resistance grade (D)
Structural category
Climate conditions
Working conditions
Average temperature of the coldest month is lower than -15℃
Average temperature of the coldest month is between -5 and -15℃
Head of surface water intake
Total number of freeze-thaw cycles
Head of surface water intake
Part above the water level fluctuation zone
Position and exposed pools, etc.
Note: ①Concrete frost resistance grade D: refers to concrete specimens with an age of 28 days. After one action of the corresponding total number of freeze-thaw cycles, its strength reduction is not more than 25%, and its weight loss does not exceed 5%. ②The temperature should be determined based on the actual measured data for more than 5 consecutive years and its average value is calculated. ③The total number of freeze-thaw cycles refers to the number of alternating times in one year when the temperature drops from above +5℃ to below -5℃ and then rises back to above +5℃. For the surface water intake head, the number of freeze-thaw cycles caused by water level fluctuations during the period when the monthly average temperature is lower than -5°C in a year should also be considered. At this time, each rise and fall of the water level should be calculated as one freeze-thaw cycle.
Article 2.1.6 Concrete for water storage or water treatment structures, underground structures and pipelines shall not use chloride salts as antifreeze and early hardening admixtures; the use of other admixtures shall be determined based on test identification to determine their applicable performance and corresponding admixture amounts. Article 2.1.7 Brick and stone masonry materials for water storage or water treatment structures, underground structures and pipelines shall meet the following requirements: 1. Bricks shall be ordinary clay machine bricks, and the grade shall not be lower than 75. 2. The grade of stone shall not be lower than 200.
3. Masonry mortar shall be cement mortar.
Article 2.1.8 The Poisson's ratio (μ) of concrete can be 1/6. Engineering Construction Standard Full-text Information System
W355; Ordinary Portland cement is suitable for cement; Aggregates should be well graded and cement dosage should be strictly controlled. When No. 325 cement (equivalent to No. 400 hardened cement) is used, cement dosage should not exceed 360 kg/m3. The cement dosage of prestressed concrete can be increased by 50 kg/m3 as the control value.
Permissible value of concrete anti-seepage grade
Ratio of maximum action head to concrete thickness () <10
Anti-seepage grade (&)
Note: The definition of anti-seepage grade S: refers to concrete specimens with an age of 28 days, which meet the water-impermeability index after applying kg/cm2 water pressure.
Article 2.1.4 Engineering Construction Standard Full Text Information System for Water Storage or Water Treatment Structures, Underground Structures and Pipelines
W Engineering Construction Standard Full Text Information System
Concrete, when meeting the requirements of anti-seepage, generally does not need other anti-corrosion treatment: Concrete in contact with corrosive media with a pH value lower than 6.0 should be determined according to the current relevant specifications or through special tests. Article 2.1.5 In areas where the average temperature of the coldest month is lower than -5°C, the concrete of exposed reinforced concrete structures should be guaranteed to have good anti-freeze performance. The anti-freeze grade of the concrete should be determined through tests and should meet the requirements of Table 2.1.5. Note: When it is difficult to test the anti-freeze grade of concrete due to equipment conditions, concrete with a grade not less than 250 should be used, and it should meet the requirements of water-cement ratio and cement dosage in the notes to Article 2.1.3 of this specification.
Allowable value of concrete frost resistance grade (D)
Structural category
Climate conditions
Working conditions
Average temperature of the coldest month is lower than -15℃
Average temperature of the coldest month is between -5 and -15℃
Head of surface water intake
Total number of freeze-thaw cycles
Head of surface water intake
Part above the water level fluctuation zone
Position and exposed pools, etc.
Note: ①Concrete frost resistance grade D: refers to concrete specimens with an age of 28 days. After one action of the corresponding total number of freeze-thaw cycles, its strength reduction is not more than 25%, and its weight loss does not exceed 5%. ②The temperature should be determined based on the actual measured data for more than 5 consecutive years and its average value is calculated. ③The total number of freeze-thaw cycles refers to the number of alternating times in one year when the temperature drops from above +5℃ to below -5℃ and then rises back to above +5℃. For the surface water intake head, the number of freeze-thaw cycles caused by water level fluctuations during the period when the monthly average temperature is lower than -5°C in a year should also be considered. At this time, each rise and fall of the water level should be calculated as one freeze-thaw cycle.
Article 2.1.6 Concrete for water storage or water treatment structures, underground structures and pipelines shall not use chloride salts as antifreeze and early hardening admixtures; the use of other admixtures shall be determined based on test identification to determine their applicable performance and corresponding admixture amounts. Article 2.1.7 Brick and stone masonry materials for water storage or water treatment structures, underground structures and pipelines shall meet the following requirements: 1. Bricks shall be ordinary clay machine bricks, and the grade shall not be lower than 75. 2. The grade of stone shall not be lower than 200.
3. Masonry mortar shall be cement mortar.
Article 2.1.8 The Poisson's ratio (μ) of concrete can be 1/6. Engineering Construction Standard Full-text Information System
W3
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