Standards related to:

GB/T 13752-1992GB/T 13752-92

GB

NATIONAL STANDARD OF THE

PEOPLE’S REPUBLIC OF CHINA

UDC 621.873.001.63

P 97

Design rules for tower cranes

ISSUED ON. NOVEMBER 5, 1992

IMPLEMENTED ON. MAY 1, 1993

Issued by. General Administration of Quality Supervision, Inspection and

Quarantine of the People’s Republic of China

3. No action is required - Full-copy of this standard will be automatically &

immediately delivered to your EMAIL address in 0~60 minutes.

Table of Contents

1 Subject content and scope of application ... 4

2 Normative references ... 4

3 Symbols and codes ... 5

4 General ... 8

5 Structure ... 27

6 Mechanism ... 54

7 Electric ... 79

Annex A (Supplement) Numerical table data for the stability calculation of the

structural members subjected to axial compression and the

bending structural members ... 90

Annex B (Supplement) Table for the fatigue strength calculation of the

structures ... 95

Annex C (Reference) Examples for the working levels of the tower cranes . 100

Annex D (Reference) Estimation method of the hoisting impact factor 1 ... 101

Annex E (Reference) Load generated by the acceleration (deceleration) of

the transmission mechanism ... 103

Annex F (Reference) Selection of the rail and wheel combination ... 107

Annex G (Reference) Determination of the axial force FN ... 108

Annex H (Reference) Calculated length factor μ ... 110

Annex I (Reference) Calculation equation for the bending moment coefficient

CH of the transverse load ... 121

Annex J (Reference) Stress amplitude method for the

fatigue strength calculation of the structure ... 124

Annex K (Reference) Standard load spectrum for the mechanism of the tower

crane ... 127

Annex L (Reference) Examples for the working levels of the tower crane’s

mechanism ... 128

Annex M (Reference) JC, Z values in the selection calculation of the

motor capacity for the tower crane’s mechanism ... 129

Annex N (Reference) Motor overload checking ... 130

Annex O (Reference) Heat checking of the asynchronous motors ... 132

Annex P (Reference) Stability checking of the oil cylinders ... 134

Annex Q (Reference) Method of determining the fatigue strength limit σrk .. 136

Annex R (Reference) Allowable physical quantity of the

commonly used friction surface material ... 142

Annex S (Reference) Selection coefficient C of the wire rope ... 143

Annex T (Reference) Calculation method of the reel wall thickness ... 144

Annex U (Reference) Calculation method of the slewing bearing selection . 147

Annex V (Reference) Current carrying capacity of the wire ... 153

Design rules for tower cranes

1 Subject content and scope of application

This Standard specifies the basic criteria and calculation methods that the

design calculation for tower cranes should follow. All other calculation methods

that are proved to be correct and reliable by theory and practice can also be

used.

This Standard is applicable to various types of power-driven tower cranes for

various uses.

This Standard is not applicable to the tower cranes converted by auto, tyre and

crawler cranes.

2 Normative references

GB 699 Quality carbon structural steels - Technical conditions

GB 700 Carbon structural steels

GB 755 Rotating electrical machines - General technical requirements

GB 985 Basic forms and sizes of weld grooves for gas welding, manual arc

welding and gas-shielded arc welding

GB 986 Basic forms and sizes of weld grooves for submerged arc welding

GB 998 Basic testing method of low voltage apparatus

GB 1591 Low alloy structural steels

GB 10051.1 Lifting hooks - Mechanical properties, lifting capacities, stresses

and materials

GB 1231 Specifications of high strength bolts with large hexagon head, large

hexagon nuts, plain washers for steel structure

GB 1300 Steel wires for welding

GB 3077 Alloy structure steel - Technical requirements

GB 3098.1 Mechanical properties of fasteners - Bolts, screws and studs

GB 3323 Methods for radiographic inspection and classification of

radiographs for fusion welded butt joints in steel

GB 3632 Sets of torshear type high strength bolt hexagon nut and plain

washer for steel structures

GB 3811 Design rules for cranes

GB 5117 Carbon steel covered electrodes

GB 5118 Low alloy steel electrodes

GB 5144 Safety rules for construction tower cranes

GB 10054 Builder’s hoist - Specification

GB 10055 Safety code for builder’s hoist

GB 11352 Carbon steel castings for general engineering purpose

JJ 3 Design rules for construction winches

JJ 12.1 Specification for welding quality of construction machinery

TJ 7 Code for design of industrial and civil building foundation

JJ 40 Fixed fill fluid coupling for tower cranes

JJ 75 Lifting equipment - Design requirements of the hook anti-off pawl

3 Symbols and codes

3.1 Loads

F - Concentrated load, force;

p - Pressure;

M - Bending moment, moment;

T - Torque.

3.2 Limit values for checking

σ - Calculated tensile and compressive stresses;

[σ] - Allowable stress of the materials;

σs - Yield point of the materials;

σb - Tensile strength of the materials;

σ0.2 - Test stress when the residual strain of the standard tensile test for

materials is up to 0.2%;

τ - Calculated shear stress;

[τ] - Allowable shear stress of the materials;

σrk - Fatigue strength limit;

E - Elastic modulus of the materials;

[λ] - Allowable slenderness ratio of the structural members;

λ - Slenderness ratio of the structural members;

σs - Maximum calculated tensile and compressive stress amplitudes;

τa - Maximum calculated shear stress amplitude;

[σa] - Allowable tensile and compressive fatigue stress amplitudes;

[τa] - Allowable shear fatigue stress amplitude.

3.3 Geometric parameters

l, L - Length, distance;

h - Height;

D, d - Diameter;

R, r - Radius;

b - Width;

e - Eccentricity;

Ia - Cross-sectional moment of inertia;

J - Moment of inertia;

W - Section bending modulus of the structural members;

A - Windward area of the structure, cross-sectional area of the structural

members;

P - Thread pitch, rope groove pitch;

δ - Thickness;

ᇞ - Displacement;

θ - Angle;

V - Volume.

3.4 Calculation coefficients

K, k - Dimensionless coefficient;

Kn - Safety factor;

Kf - Load spectral coefficient;

Ks - Structural stress spectral coefficient;

Km - Mechanism load spectral coefficient;

μ - Friction coefficient, length coefficient of the structural members;

α, β, f - Coefficients;

Cδ - Flexibility;

CW - Wind coefficient;

C - Wire rope selection coefficient;

C0 - Reduction factor of unequal end bending moment;

CH - Transverse load bending moment coefficient;

ω - Structural filling rate;

- Windshield reduction factor;

- Stability coefficient of the structural members subjected to axial compression;

ψ - Correction factor of axial compression stability;

W - Lateral buckling stability factor of the bending structural members;

1 - Hoisting impact factor;

2 - Hoisting dynamic load factor;

a. For Item a. in the normal operation above, CALCULATE vh according to the

maximum slewing speed at which the motor is unloaded, and DETERMINE

2e.

b. For Item b. in the normal operation above, CALCULATE vh according to more

than 0.5 times the maximum slewing speed at which the motor is unloaded,

and DETERMINE 2e.

4.2.1.2.3 CONSIDER the dynamic load generated when the suspended

hoisting item is suddenly completely or partially unloaded. TAKE the unloading

impact factor 3 multiplied by the hoisting load FQ into consideration.

CALCULATE according to the Equation (3).

Where.

ᇞm - Unloaded hoisting mass, kg;

m - Hoisting mass, kg.

4.2.1.3 Running impact factor

When the tower crane or its hoisting car is running, the collision load generated

due to the unevenness of the track is taken into consideration by the running

impact factor 4 multiplied by the deadweight load Fg and the hoisting load FQ.

SELECT 4 according to Table 7.

Table 7 Running Impact Factor 4

Running speed, m/s Impact factor 4

≤ 1 1.1

> 1 1.2

4.2.1.4 Load caused by the acceleration (deceleration) of the

transmission mechanism

a. The load in the load bearing structure or mechanism, due to the acceleration

(deceleration) of t...

...