What are steps for launching gantry to cross piers?
Walking type launching gantry is a special bridge construction equipment for highway construction. With step by step, it crosses piers to prepare for gider installation. Below steps for crossing piers for your reference:
launching gantry
What are ZZHZ quality control measures?
Launching gantry demands a high quality as special bridge construction equipment. To be responsible for workers and equipment, ZZHZ adopts below quality control measures:
ZZHZ launching gantry
Why ZZHZ need a longer production date for a launching gantry?
ZZHZ is one of China leading manufacturers to produce high quality launching gantry for highway and high speed railway. With annual productivity 10 sets, ZZHZ launching gantries have been exported to at least 10 countries and receive good reputation.
How to inspect the frequency converter of the launching gantry?
What are safety control system of launching gantry?
Launching gantry safety control system ensures the equipment and peronnel safety, it palys a crucial part in the working process. Here let’s briefly introduce them.
launching gantry
What are Main Technical Parameters for HZP450t Segmental Assembly Bridge Girder Launching Gantry?
working steps for standard span
segmental assembly bridge girder launching gantry
Main technical parameters
| No. | Item | Technical parameters |
| 1 | Max lifting capacity | 50t |
| 2 | Lifting height | 25m |
| 3 | Span | 30m |
| 4 | The whole machine working level | A3 |
| 5 | Longitudinal slope | ±2.0% |
| 6 | Lateral slope | ±2.0% |
| 7 | Min curve radius at working | 2500m |
| 8 | Girder-feeding method | Finish girder-feeding on the bridge floor at rear part and lower part of the launching girder |
| 9 | Applicable segment length | (7-9)m |
| 10 | Segment height/width | 1.7m×3.25m |
| 11 | Max segment weight(without spreader) | 43t |
| 12 | Max lateral moving speed of launching girder | 0-0.5m/min |
| 13 | Longitudinal moving speed of launching girder | 0-1.0m/min |
| 14 | Spreader rotation | 360° |
| Spreader cross adjustment degree | ±4% | |
| Spreader longitudinal adjustment degree | ±4% | |
| 15 | Lifting trolley number | 1 |
| Cross adjustment distance | ±0.9m | |
| Lateral moving speed | 0～1.0m/min | |
| Longitudinal moving speed | 0～15m/min | |
| 16 | Main girder number/length | 2/36m |
| 17 | Auxiliary front leg number | 1 |
| 18 | Front leg number | 1 |
| 19 | Rear leg number | 1 |
| 20 | Auxiliary rear leg number | 1 |
| 21 | 10t auxiliary trolley number | 1 |
| 22 | Out dimension of launching girder at working (length x width x height) | 65×9m×13m |
| 23 | Total power | AC/380V/ 3-phase,5 wires,about 220kw |
| 24 | Total weight | About 550t |
Accidents Points for Launching Gantry in the Bridge Construction Process
To effectively prevent, timely control and eliminate the damage caused by sudden accident in the bridge construction process, reduce loss caused by the accident to a maximum extent, maintain interest of society and enterprise, ensure human and property safety, ZZHZ makes a series of measures to manage the launching gantry working.
launching gantry
What Factors Will Decide the Price of Launching Gantry?
The launching gantry is an equipment to install precast girder on prefabricated piers, making a huge contribution to bridge construction in China. With fast development of high speed railway, more and more launching gantry is widely used in the high speed railway construction. While price of launching gantry is quite different with larger fluctuation, why does it happen? Below is a simple analysis from ZZHZ:
launching gantry
- Different brand. Famous brand has better quality warranty, more considerate service and more guarantees compared with small factories. That makes a difference.
- Different type. According to different demands, each type for one customer group. Different needs, different type, then different cost leads to type difference.
- Old or new equipment. New equipment usually uses new technology and better spear parts which cause a rise of cost and expensive price. As time goes on and launching gantry prevails, the price will decline gradually.
?Keeping innovation and pursuing excellence? are critical concept of ZZHZ, friends from all of the world are warmly welcome to visit ZZHZ, we will be at your service anytime.
What are Advantages of Walking Type Launching Gantry?
Walking type launching gantry is a new type of bridge construction crane fabricated to meet demands of market and actual working condition, combined with current successful experience of ZZHZ and other companies. It features:
walking type launching gantry
The Fabrication Process of Bridge Girder Launcher
Launching Gantry
a. the bridge girder launcher mainly uses Q235B steels: the butt welds of cover board and web board, the outer lead weld of cover board and web board adopts Lincoln weld, other welds use CO2 gas shielded welding; welding material: welding rod of Lincoln weld H08A, and HJ431; welding rod of CO2 gas shielded welding: ER50-6; the electrode of tack welding uses J422 when the machine is assembled. The 100% ultrasonic inspection should be done for butt welding, the acceptance standard is GB11345-89, and the grade of welding quality is I grade; the welds between cover board and web board adopt melt thru weld, the 100% ultrasonic inspection is done after welded, and I grade is qualified. All of T joints do X-ray detection, the acceptance standard is GB3323-87, and the grade of welding quality is II grade.
