Launching Gantry: 1. 900t Large lifting capacity 2. For high speed railway project 3. High quality 4. Rich experience

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.

First part: 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.

Second part: technical parameters

No	Item	HZQ900	HZQ550
1	Lifting capacity	900t	550t
2	Max girder dimension	≤32.6x13.4x3m	≤32.6x8.4x3m
3	Girder-lifting style	Three-point balance	Three-point balance
4	Moving speed	0-3m/min	0-3m/min
5	Moving style	Rail	Rail
6	Trolley moving speed	0-3m/min	0-1m/min
7	Trolley lifting speed	0-0.5m/min	0-0.5m/min
8	Trolley max lifting height	7m	6.6m
9	Transverse micro-set distance	±200mm	±200mm
10	Micro-set speed	0-1m/min	0-1m/min
11	Tackle lifting weight	80t	45t
12	Min curve bridge radius	2500m	2500m
13	Power	300kw	220kw
14	Control style	Electro-hydraulic integration	Electro-hydraulic integration
15	Out dimension	73.9x 13.5x17.8	75.8x11.58x11.8
16	Total weight	584t	442t

900t Launching gantry for high speed railway