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GB 50669-2011: Code for construction and acceptance of reinforced concrete silos
GB 50669-2011
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 50669-2011
Code for Construction and
Acceptance of Reinforced Concrete Silos
ISSUED ON: FEBRUARY 18, 2011
IMPLEMENTED ON: MAY 1, 2011
Jointly issued by: Ministry of Housing and Urban-Rural Development of
the People's Republic of China;
General Administration of Quality Supervision,
Inspection and Quarantine of the People's Republic of
China.
Table of Contents
Foreword ... 4
1 General Provisions ... 8
2 Terms ... 9
3 Basic Requirements ... 11
4 Foundation Works ... 14
4.1 General Requirements ... 14
4.2 The Ground and Pile Foundation Work ... 14
4.3 Earth and Foundation Pit Works ... 15
4.4 Reinforcement Works ... 15
4.5 Formworks ... 16
4.6 Concrete Works ... 16
5 Cylinder Structure ... 18
5.1 General Requirements ... 18
5.2 Reinforcement Works ... 20
5.3 Formworks ... 21
5.4 Concrete Works ... 22
5.5 Prestressed Works ... 23
5.6 Liner Works ... 25
6 Silo-bottom and Internal Structure Works ... 27
6.1 Silo-bottom Structure and Filling Works ... 27
6.3 Hopper Liner Works ... 28
7 Silo-top Works ... 30
7.1 Silo-top Steel Structure Works ... 30
7.2 Silo-top Concrete Structure Works ... 31
8 Ancillary Works ... 33
9 Seasonal Construction ... 34
9.1 General Requirements ... 34
9.2 Construction in Winter or Rainy Season ... 34
10 OHS and Environmental Protection ... 35
10.1 Occupational Health and Safety ... 35
10.2 Environmental Protection ... 36
11 Quality Acceptance ... 38
11.1 Classification of Quality Acceptance ... 38
11.2 Acceptance of Project Quality ... 39
11.3 Inspection and Evaluation of Project Quality ... 41
Appendix A -- Testing of Cylinder Structure ... 44
Appendix B -- Verticality Test of Cylinder Structure ... 46
Explanation of Wording in This Code ... 51
List of Quoted Standards ... 52
1 General Provisions
1.0.1 This code is formulated with a view to improving the construction level of
reinforced concrete silo works, regulating the quality acceptance of reinforced
concrete silo works and achieving advanced technology, reliable quality, safety,
usability, economy and rationality.
1.0.2 This code is applicable to the construction and quality acceptance of
circular or polygonal cast-in-place reinforced concrete silos storing bulk
materials and compressed air mixing silo of mixed powders.
1.0.3 The requirements for construction quality acceptance in the contract
agreement document and engineering technical document adopted for the
construction of reinforced concrete silo works shall not be less than the
requirements of this code.
1.0.4 New technologies, new processes, new equipment and new materials
shall be popularized in the construction of reinforced concrete silo works.
1.0.5 The construction of reinforced concrete silo works shall comply with the
management provisions of relevant OHS and environmental protection.
1.0.6 This code shall be used together with the current national standard
“Unified Standard for Constructional Quality Acceptance of Building
Engineering” GB 50300.
1.0.7 The construction and quality acceptance of reinforced concrete silo works
shall not only comply with this code but also comply with those in the relevant
current national standards.
2 Terms
2.0.1 Reinforced concrete silo
The circular, square, rectangular, polygonal and other geometric shape upright
reinforced concrete vessels storing bulk materials are referred to as silos; the
part holding materials is the silo body.
2.0.2 Silo-top
The structure to seal the top surface of the silo body.
2.0.3 Silo-wall
The vertical wall of silo body directing contact the stored material and bearing
the its lateral pressure.
2.0.4 Supporting wall
The vertical wall with same plane as the silo body and supporting the silo body.
Silo-wall together with supporting wall is called cylinder.
2.0.5 Silo-bottom structure
The concrete structure on silo body bottom to support cone, filler, stored
material and form a hopper.
2.0.6 Cone
The conical structure inside the silo body to homogenize and decompress the
stored materials.
2.0.7 Hopper
The vessel at the lower part of silo body to discharge the stored materials.
2.0.8 Filler
The filler material used to form the discharging slope at the silo-bottom.
2.0.9 Liner
The structural layer used for the protection and abrasion resistance of parts
directly contact with stored materials, such as silo-bottom, hopper, silo-wall, etc.,
and helping for the flow of discharged materials.
2.0.10 Bulk material
4 Foundation Works
4.1 General Requirements
4.1.1 The foundation works construction must be provided with engineering
geology investigation data. Before construction, detailed distribution conditions
of engineering geology, underground pipelines, underground obstructions and
cultural relics shall be grasped and the type, distribution and structure of
adjacent buildings and underground facilities shall be learnt about.
4.1.2 The foundation pit supporting form shall be determined comprehensively
by combining the factors such as hydrological geology conditions, ground load,
construction duration, etc. During the construction, the foundation pit side slope
shall be monitored according to the requirements and any discovered abnormal
condition shall be treated timely.
4.1.3 Special job file shall be compiled for the construction of pile foundation
works; in the complex geological areas, the engineering geology investigation
data required for construction should be supplemented according to the actual
demand to determine the reasonable comprehensive piling construction
scheme.
4.1.4 Quality inspection shall be carried out for non-natural foundations, such
as pile foundation, composite foundation, artificial replacement foundation, etc.,
according to the design requirements and the relevant requirements of current
national standard “Code for Acceptance of Construction Quality of Building
Foundation” GB 50202.
4.1.5 If abnormal condition of foundation occurs during the construction process,
it shall be treated according to the relevant requirements of the current
professional standard “Technical Code for Ground Treatment of Buildings” JGJ
79.
4.2 The Ground and Pile Foundation Work
4.2.1 Foundation subsoil must be inspected for foundation treatment works and
composite foundation; and concealment acceptance procedures shall be
handled before the construction of replacement layer and foundation works.
4.2.2 The pile shall be tested before the construction of pile foundation
according to the engineering design requirements and the requirements of the
current professional standard “Technical Code for Testing of Building
Foundation Piles” JGJ 106.
4.2.3 As for the pile foundation works adopting pile driving (sinking) process for
replacement of reinforcement.
4.4.2 The position, spacing, connection mode and anchoring length of
reinforcement shall meet the design requirements as well as the relevant
requirements of current national standard “Code for Acceptance of
Constructional Quality of Concrete Structures” GB 50204.
4.4.3 The protective layer cushion blocks of foundation reinforcement shall be
placed uniformly and possess sufficient compression strength; its strength shall
not be less than the design strength level of the foundation concrete.
4.4.4 Upper layer reinforc...