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DF900D Nose-girder Positioning Beam Launcherf (DF900D BL for short)develop by us is one of our NDF’s advanced equipments specialized for erecting Class 900t Railway Box-girder Bridge.
With high manufacturing quality, it was developed and improved on the base of our DF900 simple-span type Lauching Girder and desiged with many excellent features by absorbing advantadges of same purpose equipments at home and abroad.
DF900D Launching Girder is used to erecting Railway Precast Concrete Box-girder Bridge with span up to 32meters and weight up to 900tons. For bridge type, it often used to erect Double-track monolithic box- girder Bridge, and can meet different span-beams’ erection (like 32m,24m and 20m) in one project.
Besides the normal operation, it perfectly meets the needs to erect first-span and last-span beams and can be operated and exchange flexibly between many different construction conditions. And transported by our Elevating Transporter(ET), it can be moved from one place to another and pass through tunnels.
(1)Main Technical Specification:
 Work Rank: A3
 Hoisting Capacity : 900t
 Applicable Span: 32m,24m and 20m
 Anti-hoisting Impact Factor: 1.05
 Max. Hoisting Height: 7.2m
 One-span Forward Moving Speed：0～3.0m/min
 Factor of Safety Against Overturning：≧1.5
 Applicable Longitudinal Gradient：≤2.0%
 Applicable Curve Radius：≥600m
 Walking Speed of Beam-hoisting Trolley：0～3m/min
 Hoisting Speed of Beam-hoisting Trolley:
Transverse fine adjustment Speed ：0～5.0mm/s
Transverse fine adjustment Scope：±250mm
Longitudinal fine adjustment Speed：0～5.0mm/s
Longitudinal fine adjustment Scope: ±250mm
 Max. Deflection Of Nose-girder：61.5mm
 Average Beam-erection Speed：2spans/8hours
(totally about 8 kilometres long)
 Dimension(Length× Width ×Height):
1) Whole Machine Overall Dimension：
（includes Dimension of itsTranporter）
2)Max. Part Dimension while transported：11m×3.3m×2.3m
(referring to Nose-girder Main Girder)
1) Whole Machine Weight：525tons
2) Max. Part Weight while transported：27tons
 Power Source：380V 4Ac
(equiped with 300Kw Diesel Engine)
 Drive mode：Hydrocylinder driven by Hydraulic
Station and other parts by electric motor
 Control mode： By control cab and wireless remote control (2) Suitable working condition
a. Max.working Altitude: ≤2000m
b. Ambient temperature：-20C°~+ 50C°
c. Wind power：working≤6 grade，non-working≤11 grade.
d. The abutment supporting the Launching Girder should be level and Project Site againsts dangers of flammability, explosive and corrosive gas.
e. Designed with enough light to meet nighttimes working
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