How does the Bridge Girder Launcher Construct Bridge?

Answer 1

With the development of our national economy, the construction of high speed railway reaches unprecedented upsurge. For 10 years, ZZHZ has been involved in manufacturing construction machinery and hoisting machinery. Therein, bridge girder launcher and gantry crane are widely used in high speed railway construction, being awarded the national patent. Featuring reasonable design, convenient installation and dismounting, especially high safety, they are highly praised by our customers and make great contribution to safe construction of high speed railway. Construction project of Beijing-Shanghai high speed railway will be one of the biggest projects.

According to design construction specification of Beijing-Shanghai railway and hoisting machinery design specification, ZZHZ designed HZQ series bridge girder launcher for China high speed railway, combined advantages of bridge girder launchers of home and abroad. Made up of main girder, front launching nose, O type support legs, front support legs, bottom launching nose, auxiliary overhead crane, auxiliary support leg of main girder, lifting trolley, winch and lifting system, the bridge girder launcher can install 900t precast girder with span from 24m to 32m.

Steps to construct bridge:

(1). After finishing installation on the abutment, the bridge girder launcher will move longitudinally from one pier to next pier

1. Two lifting trolleys move to the end part of the main girder, then lift auxiliary support legs of main girder, the bridge girder launcher begins to move forward.

2. After front support legs moves to certain position, lift its cylinder and fix the leg

3. Front lifting trolley lifts the end of the bottom launching nose to move forwards about half distance of main girder, auxiliary overhead crane under the front launching nose lifts the bottom launching nose to the front abutment, the longitudinal movement is finished.

(2). Transport girders and Feed girders

1. Two gantry cranes lift one precast girder at the same time

2. The transporter carrys the girder to the end of the bride girder launcher, then take back its cylinder. Trolley to move girders on the transporter carrys the precast girder to somewhere below the front lifting trolley of the bridge girder launcher

3. The front lifting trolley lifts the precast girder to move forwards until the rear lifting trolley can lift the rear part of the precast girder, then they move forwards together

4. Put the girder down into designated location

(3). When the bridge girder launcher installs the last girder,

1. Fold up the bottom part of the front leg, then longitudinally move forwards,

2. Support the support leg, then disassemble the rear support leg of the bottom launching nose and remove the launching nose, put down the last girder to finish constructing the whole bridge.