Launching Gantry Integrating Carrying and Installing Girders

launching gantry
Application range and usehide/show
HZQ series launching gantry integrating carrying and installing girders combines two functions: it can lift and install precast girders to proper position as a launching gantry; as the rear part is divided with launching gantry, it is used as a gantry crane to carry girders in the precast yard to the rear part of launching gantry for girder feeding, which saves construction cost for customers, quite convenient. While it is suitable for bridge construction with less girders and short distance.
Main features and advantageshide/show
According to users’ demands, the new type Bridge Girder Erection Machine which integrates carrying with erecting is designed. Also we apply for national patent (The patent No. is 02228146.0)
◆ The machine can accomplish the girder’s carrying with erecting at the same time.
◆ The machine can erect 4 pieces of girders with another two cranes one day, saving construction cycle.
◆ Another advantage: if the concrete girder is between the two piers, just exchange the front and rear legs, it can continue to work, no extra assembly, shortening construction period.
Main Parametershide/show
Item/ Data /Model HZQ50-160C HZQ40-100C HZQ35-80C HZQ30-60C
Max Span 50m 40m 35m 30m
Hoist Capacity 160t 100t 80t 60t
Lifting Speed of Trolley 0.8m/min 0.8m/min 0.8m/min 0.8m/min
Moving Speed of Trolley 4.5m/min 4.5m/min 4.5m/min 4.5m/min
Moving Speed of Crane 2.7m/min 2.7m/min 2.7m/min 2.7m/min
Loading Capacity 80t×2 50t×2 40t×2 30t×2
The Speed of Heavy Load 4-8m/min 4-8m/min 4-8m/min 4-8m/min
The Speed of Empty Load 18m/min 18m/min 18m/min 18m/min
Max Angle of Skew Bridge 45° 45° 45° 45°
Min Allowed Radius For Curved bridge R350 R300 R300 R300
The design basis of producthide/show
We design the launching gantry according to the rules of the newest machinery and crane in China, the rules are following:
《Cranes–Test code and procedures》 GB5905
《Safety regulations for hoisting machinery》 GB6067
《Code for design of steel structures》 GB50017
《Safety technology specification for special equipment》 TSG Q7002、Q0002
《Code for construction and acceptance of steel structure》GB50205
《Standard for quality inspection and evaluation of steel structure engineering》 GB50221
《Weld Outer Dimensions for Steel Construction》GB10854
《Code for construction and acceptance of electric equipment installation engineering》 GB232
《General technical requirements of assembly》 JB/ZQ400.9
《Mechanical properties of fasteners》 GB3098
Main requirements of designhide/show
◆ Technical index;
Safety factor 1.5
Using grade: U3
Load state: moderate
Working grade of the whole machine: A3
Working grade of the mechanism:M4
Working condition and requirements of design etc.
◆ Calculation analysis and check-calculation of the whole structure According to technology condition of design of crane, we confirm the construction condition, and then calculate and analyze the strength, stiffness and stability.
After the classical calculation, we start the calculating work of design of steel structure, and adopt the finite element analysis, the load applied to models respectively, and then calculating and analyzing beam element and plate element. Finally, the authoritative department will check and calculate again.
Main mechanical manufacturing technologyhide/show
quality control of manufacturing processhide/show
Tracing data and leaving factory data of producthide/show
The method and steps of installationhide/show
Checking methods after installation of producthide/show
operating requirements and attentionhide/show
Time and item of maintenancehide/show
Disassembly and steps of transferring sitehide/show