1 General Provisions
1.0.1 This code is formulated to meet the needs of transportation and communication development and ensure high-quality engineerings of prestressed concrete pavement in order for advanced technology, economy and rationality as well as safety and usability.
1.0.2 This code is applicable to the design, construction and acceptance of newly-built unbounded prestressed concrete pavement.
1.0.3 It shall apply new technology, new material, new process and to engineerings of prestressed concrete pavement so as to meet the requirements of application condition, environment condition and economic condition for engineering.
1.0.4 The engineering design, construction and acceptance of prestressed concrete pavement shall not only meet the requirements stipulated in this standard (code), but also comply with those in the current relevant ones of the nation.
2 Terms and Symbols
2.1 Terms
2.1.1 Cement concrete pavement
The pavement with cement concrete as surface course (reinforcement or non-reinforcement), which is also called rigid pavement.
2.1.2 Cement concrete pavement
The cement concrete pavement where compression stress is imposed on pavement working section in advance to improve mechanical performance.
2.1.3 Critical load position
The location with maximum fatigue damage caused by prestressed concrete pavement under combined action of load and temperature.
2.1.4 Sliding layer
The pavement structure layer set up on top surface of base layer to prevent loss of prestress caused by excessive slab bottom friction resistance of prestressed concrete pavement.
2.1.5 Unbounded prestressing tendon
Single prestressed steel strand applying special anti-corrosive lubricant grease and plastic coating; it may keep relative sliding between steel strand prestressed concrete.
2.1.6 Slab bottom friction stress
The stress on pavement slab caused by relative sliding between slab and base layer of prestressed concrete pavement.
2.2 Symbols
2.2.1 Material property
Et— Equivalent modulus of resilience for top surface of base layer;
Ec—Flexural-tensile elastic modulus of concrete;
Ez—Elastic modulus of reinforcement;
Eo—Equivalent modulus of resilience for top surface of road bed;
E1— Modulus of resilience of base layer;
E2— Modulus of resilience of base layer; subbase layer or under layer;
Ek— Equivalent modulus of resilience for base layer and subbase layer or under layer;
fr—Standard value for flexural-tensile strength of concrete;
fyk—Standard value for strength of ordinary reinforcement;
Dx — Equivalent flexural rigidity of base layer and subbase layer or under layer;
ρ—Concrete density.
2.2.2 Action, action effect and bearing capacity
σ1r—Load fatigue stress;
σ1.—Load stress;
σΔTr—Temperature fatigue stress;
σΔT—Temperature stress of pavement slab;
σp— Mean compression stress of concrete caused by effective prestress;
σF—Friction stress of subgrade;
σpc—Effective prestress of prestressing tendon;
σcon—Tension control stress of prestressing tendon;
σ1n—Value for prestress loss of nth item;
N.—Action times of standard axial loading;
Ni—Action times of Grade axial loading of all axle types;
Nc—Accumulated action times of standard axial loading of lane in design life;
Pi—Total weight of all axle types
2.2.3 Geometric parameter
dn—Nominal diameter of steel strand
δ—Displacement value for ends of pavement slab;
Ls—Calculated length of sliding area;
r—Relative rigidity radius of prestressed concrete slab;
h—Thickness of concrete slab;
hx—Equivalent thickness of base layer and subbase layer or under layer;
h1—Thickness of base layer;
h2—Thickness of subbase layer or under layer;
χ—Distance between calculated load position and slab end.
2.2.4 Calculation coefficients and others
ai—Coefficient of axle -wheel type;
gr—Annual average growth rate of traffic volume;
t—Design life;
η—Coefficient of wheel tracking transverse distribution;
—Friction coefficient of subgrade;
Tn—Maximum temperature difference of pavement slab;
—Variation coefficient;
r—Reliability coefficient;
TR —Gradient calculated value for maximum temperature of concrete slab;
κ—Friction coefficient considering partial deviation of per meter hole;
—Friction coefficient between prestressing tendon and hole wall;
β—Reinforcement ratio;
—Coefficient of fatigue stress considering accumulated fatigue action of load stress within design reference period;
—Coefficient of colligations considering the effect of unbalance load and mobile load on pavement fatigue damage;
ν—Index related to mixture property;
ωo—Value for calculated rebound deflection of original pavement;
—Coefficient of fatigue stress considering accumulated fatigue action of temperature stress;
—Temperature expansion coefficient of concrete;
ΔΤ—Temperature difference between upper- and lower-layer concrete pavement slab;
—Poisson's ratio of concrete.
1 General Provisions
2 Terms and Symbols
2.1 Terms
2.2 Symbols
3 Basic Requirements
3.1 Design parameter
3.2 Structure construction and composition
4 Pavement Structure Design
4.1 Geometric dimension
4.2 Reinforcement
4.3 Sliding layer
4.4 Expansion joint
4.5 Sleeper beam
4.6 Anchorage zone
4.7 Post-placed strip
5 Material
5.1 Concrete material
5.2 Ordinary steel reinforcement (products)and prestressing tendon
5.3 Anchorage system
5.4 Jointing material
5.5 Admixture
6 Construction Method and Technical Requirements
6.1 Construction machinery
6.2 Construction preparation
6.3 Construction procedure
6.4 Construction of sleeper beam and expansion joint
6.5 Laying of sliding layer
6.6 Laying of prestressing tendon and ordinary reinforcement
6.7 Pouring of prestressed concrete pavement
6.8 Tensioning of prestressing tendon
6.9 Curing
6.10 Post-placed strip concrete construction
6.11 Conditioning and caulking of expansion joint
6.12 Construction under special climatic conditions
7 Quality Inspection and Acceptance
7.1 General requirement
7.2 Sliding layer
7.3 Concrete works
7.4 Prestress works
Annex A Traffic Analysis
Annex B Mechanical Model of Prestressed Concrete Pavement Slab
Annex C Stress Analysis and Calculation Flow of Prestressed Concrete Pavement Slab
Explanation of Wording in This Standard
Standard
GB 50422-2007 Technical code for engineerings of prestressed concrete pavement (English Version)
Standard No.
GB 50422-2007
Status
abolished
Language
English
File Format
PDF
Word Count
42000 words
Price(USD)
1260.0
Implemented on
2007-12-1
Delivery
via email in 1~5 business day
Detail of GB 50422-2007
Standard No.
GB 50422-2007
English Name
Technical code for engineerings of prestressed concrete pavement
1 General Provisions
1.0.1 This code is formulated to meet the needs of transportation and communication development and ensure high-quality engineerings of prestressed concrete pavement in order for advanced technology, economy and rationality as well as safety and usability.
1.0.2 This code is applicable to the design, construction and acceptance of newly-built unbounded prestressed concrete pavement.
1.0.3 It shall apply new technology, new material, new process and to engineerings of prestressed concrete pavement so as to meet the requirements of application condition, environment condition and economic condition for engineering.
1.0.4 The engineering design, construction and acceptance of prestressed concrete pavement shall not only meet the requirements stipulated in this standard (code), but also comply with those in the current relevant ones of the nation.
2 Terms and Symbols
2.1 Terms
2.1.1 Cement concrete pavement
The pavement with cement concrete as surface course (reinforcement or non-reinforcement), which is also called rigid pavement.
2.1.2 Cement concrete pavement
The cement concrete pavement where compression stress is imposed on pavement working section in advance to improve mechanical performance.
2.1.3 Critical load position
The location with maximum fatigue damage caused by prestressed concrete pavement under combined action of load and temperature.
2.1.4 Sliding layer
The pavement structure layer set up on top surface of base layer to prevent loss of prestress caused by excessive slab bottom friction resistance of prestressed concrete pavement.
2.1.5 Unbounded prestressing tendon
Single prestressed steel strand applying special anti-corrosive lubricant grease and plastic coating; it may keep relative sliding between steel strand prestressed concrete.
2.1.6 Slab bottom friction stress
The stress on pavement slab caused by relative sliding between slab and base layer of prestressed concrete pavement.
2.2 Symbols
2.2.1 Material property
Et— Equivalent modulus of resilience for top surface of base layer;
Ec—Flexural-tensile elastic modulus of concrete;
Ez—Elastic modulus of reinforcement;
Eo—Equivalent modulus of resilience for top surface of road bed;
E1— Modulus of resilience of base layer;
E2— Modulus of resilience of base layer; subbase layer or under layer;
Ek— Equivalent modulus of resilience for base layer and subbase layer or under layer;
fr—Standard value for flexural-tensile strength of concrete;
fyk—Standard value for strength of ordinary reinforcement;
Dx — Equivalent flexural rigidity of base layer and subbase layer or under layer;
ρ—Concrete density.
2.2.2 Action, action effect and bearing capacity
σ1r—Load fatigue stress;
σ1.—Load stress;
σΔTr—Temperature fatigue stress;
σΔT—Temperature stress of pavement slab;
σp— Mean compression stress of concrete caused by effective prestress;
σF—Friction stress of subgrade;
σpc—Effective prestress of prestressing tendon;
σcon—Tension control stress of prestressing tendon;
σ1n—Value for prestress loss of nth item;
N.—Action times of standard axial loading;
Ni—Action times of Grade axial loading of all axle types;
Nc—Accumulated action times of standard axial loading of lane in design life;
Pi—Total weight of all axle types
2.2.3 Geometric parameter
dn—Nominal diameter of steel strand
δ—Displacement value for ends of pavement slab;
Ls—Calculated length of sliding area;
r—Relative rigidity radius of prestressed concrete slab;
h—Thickness of concrete slab;
hx—Equivalent thickness of base layer and subbase layer or under layer;
h1—Thickness of base layer;
h2—Thickness of subbase layer or under layer;
χ—Distance between calculated load position and slab end.
2.2.4 Calculation coefficients and others
ai—Coefficient of axle -wheel type;
gr—Annual average growth rate of traffic volume;
t—Design life;
η—Coefficient of wheel tracking transverse distribution;
—Friction coefficient of subgrade;
Tn—Maximum temperature difference of pavement slab;
—Variation coefficient;
r—Reliability coefficient;
TR —Gradient calculated value for maximum temperature of concrete slab;
κ—Friction coefficient considering partial deviation of per meter hole;
—Friction coefficient between prestressing tendon and hole wall;
β—Reinforcement ratio;
—Coefficient of fatigue stress considering accumulated fatigue action of load stress within design reference period;
—Coefficient of colligations considering the effect of unbalance load and mobile load on pavement fatigue damage;
ν—Index related to mixture property;
ωo—Value for calculated rebound deflection of original pavement;
—Coefficient of fatigue stress considering accumulated fatigue action of temperature stress;
—Temperature expansion coefficient of concrete;
ΔΤ—Temperature difference between upper- and lower-layer concrete pavement slab;
—Poisson's ratio of concrete.
Contents of GB 50422-2007
1 General Provisions
2 Terms and Symbols
2.1 Terms
2.2 Symbols
3 Basic Requirements
3.1 Design parameter
3.2 Structure construction and composition
4 Pavement Structure Design
4.1 Geometric dimension
4.2 Reinforcement
4.3 Sliding layer
4.4 Expansion joint
4.5 Sleeper beam
4.6 Anchorage zone
4.7 Post-placed strip
5 Material
5.1 Concrete material
5.2 Ordinary steel reinforcement (products)and prestressing tendon
5.3 Anchorage system
5.4 Jointing material
5.5 Admixture
6 Construction Method and Technical Requirements
6.1 Construction machinery
6.2 Construction preparation
6.3 Construction procedure
6.4 Construction of sleeper beam and expansion joint
6.5 Laying of sliding layer
6.6 Laying of prestressing tendon and ordinary reinforcement
6.7 Pouring of prestressed concrete pavement
6.8 Tensioning of prestressing tendon
6.9 Curing
6.10 Post-placed strip concrete construction
6.11 Conditioning and caulking of expansion joint
6.12 Construction under special climatic conditions
7 Quality Inspection and Acceptance
7.1 General requirement
7.2 Sliding layer
7.3 Concrete works
7.4 Prestress works
Annex A Traffic Analysis
Annex B Mechanical Model of Prestressed Concrete Pavement Slab
Annex C Stress Analysis and Calculation Flow of Prestressed Concrete Pavement Slab
Explanation of Wording in This Standard
