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Scanclimber at the third largest structure in France

Pont Gustave-Flaubert is a vertical-lift bridge constructed over the River Seine in Rouen, France. The bridge is a lift bridge with the length of 120 meters and a height of 86 meters. Having ‘butterflies’ at the top of foundations this bridge provides passage for approximately 50,000 vehicles every day.

History

The crossing of Seine of Grand Quevilly and Petit Quevilly was chosen as route for bridge because of high proximity to residential and business areas of central Rouen. The contract for the construction of the bridge was sixty million Euros whereas the cost for entire project was 137 million Euros. The work began by June 2004 and took three years to complete. The project was first tested in April 2007 by lifting the bridge to let a barque vessel pass through. The bridge was opened for normal traffic in September 2008. The bridge is named after Gustave Flaubert, an influential French writer from Rouen.

gustave flaubert bridge up

Need of Hoist

A unique feature of this bridge is that it has two towers which stand at the height of 86 meters. It is significant that such huge structures need proper maintenance with occasional lifting in order to let vessels pass through. Having towers at such heights, it is highly inefficient to climb the stairs every time maintenance work is conducted.

gustave flaubert bridge men at work

Challenges

The project may sound simple at first as it is the installation of a hoist within the tower of a height of 86 meters. However, the work gets very challenging if there is not much room for the installation of a hoist inside in addition to other constraints such as:

  • A required payload of 2000 kg with small space not enough for appropriate installation,
  • Installation level not in inserting level,
  • The Hoist should bear construction operations without taking any damage.
gustave flaubert bridge tower inside

In order to install the hoist in a limited space, a special two tube mast integrated with special anchoring was used which was able to carry 2 ton hoist able to carry payload of 2000 kg. Man power and good handling were crucial for transportation of approx. 10 tons material of each hoist. All material was safely transported to the fitting level being shifted from one storey and then was successively used up in construction.

Construction work had to be carried out for months so a cage was created within the cage to avoid the hoist’s cage taking damage. A wood casing was customized so that only minor repair work was required on the removal of the casing.

The installation of both towers was done in shifts. After installation to a certain height the assembly team moved over to other tower while the other hoist was being used. Some project details are mentioned below

Project Facts 
Hoist used SC2000K
No. of Units Used 4
Payload Capacity
2000 kg
Special Features
  • Two tube masts with special anchoring, less installation space.

SC2000K Technical Data Overview

  • Main Components
  • Details
  • Technical Data
  • Electrical Data
  • Technical Data Lift Car and Lifting Mechanism
Description of THE SC2000K  main components
  • SC2000K Lift
    SC2000K Lift
    The lift is a functional complex and consists of the following main components:
    - ground sation
    - lift car
    - lifting mechanism
    - mast and landings
  • SC2000K Mast section
    SC2000K Mast section
    The mast section is completely hot-dip galvanised. Its height is 1.5 meters and it weighs 84 kg.
  • SC2000K Landings
    SC2000K Landings
    On the landings, there are landing sliding double doors made of sections and covered with sheeting and equipped with a safety lock. The landing door is opened manually and below the threshold it has an apron.
  • SC2000K Car
    SC2000K Car
    The car and the landings are designed such that it is possible to enter and leave the cage from the front side of the car. The car door is made as a vertical sliding door. The door is coated with a solid steel sheet. A safety lock is used for locking the door. Below the threshold the cabin is equipped with an apron 750 mm high.
  • SC200K Drive Unit
    SC200K Drive Unit
    The lift drive is provided by one unit installed above the car roof, equipped with two electric motors with helical-bevel gears. In case of emergency, it is possible to lower the car and to stop the car precisely at the nearest landing.
  • Elastomer Buffers
    Elastomer Buffers
    The buffers are used for emergency braking of the car.
  • Safety Brake
    Safety Brake
    The car is equipped with a safety brake and overload control system.
Description of SC2000K  main components
  • SC2000K Mechanical parts of lift base and lift
    SC2000K Mechanical parts of lift base and lift
    The bottom station is the lower part of the lift well with the landing door (landing 0). The hoist pit is composed of the lower part of the bottom station with the depth of 1.20 m. The mast base (1) with elastometer buffers (2) is mounted on the lift pit support base. The buffers are used for emergency braking of the car. In the bottom station there is sliding double door (3) equipped with a safety lock Schmersal AV20. 
  • SC2000K Mechanical part of mast section
    SC2000K Mechanical part of mast section
    For mast construction, mast sections 1508 mm high are used, with load bearing tubes spacing of 650 mm. The mast is anchored to the supporting structure at distances of 4.5 m by means of a special plate anchoring with a radius adjusted in the range of 450 to 500 mm by means of M20 bolts. Upper buffers are mounted on the last mast section.
  • SC2000K Mechanical part of landings
    SC2000K Mechanical part of landings
    On the landings, there are landing sliding double doors (1) made of sections and covered with sheeting and equipped with a safety lock Schmersal AV 20. The landing door with inside dimensions of 1000 x 2000 mm is opened manually. Below the threshold, the landing door has an apron (2) 750 mm high.
  • SC2000K Mechanical parts of car
    SC2000K Mechanical parts of car
    The car with a lifting capacity of Q = 2000 kg moves with a speed of v = 0.60 m/min. The car's dead weight is 1400 kg. The car and the landings are designed such that it is possible to enter and leave the cage from the front side of the car. The car door (1) is made as a vertical sliding door. The door is coated with a solid steel sheet. A safety lock Schmersal AV20 (2) is used for locking the door. Below the threshold, the cabin is equipped with an apron (3) 750 mm high.
    In case of emergency, it is possible to evacuate people from the cage through a trapdoor (4) in the roof sized 800 x 800 m, therefore guardrails (5) 1100-mm high are installed on the roof, with a 150-mm toeboard.
  • SC2000K Drive unit
    SC2000K Drive unit
    The lift drive is provided by one unit installed above the car roof, equipped with three 7,5 kW electric motors with helical-bevel gears. In case of emergency, it is possible to lower the car and to stop the car precisely at the nearest landing.
  • SC2000K Safety brake
    SC2000K Safety brake
    The car is equipped with a UC-3.0A safety brake (1) and with an overload control system which prevents a normal startup when the rated load exceeds 20%.
  • SC2000K Overload control system
    SC2000K Overload control system
    The overload control system prevents a normal startup when the rated load exceeds 20%.
  • SC2000K Running of a cable
    SC2000K Running of a cable
    The car is connected with the upper or lower landing by means of the following cables laid permanently halfway up the mast height:
    - power cable H07RN-F 4 x 16
    - control cable H07RN-F 12 x 1.5
    and then with a travelling cable SEMOFLEX BAULIFT4x16+1x2,5+10x1,5 drawing through a cable carrying carriage.
Technical DataSC2000K
Payload 2000 kg or 20 persons
Speed 36 m/min
52 m/min
Lifting height >200 m
Max. free mast after topmost anchoring 1 m
Max. distance between anchors 4,52 m
Weight of the mast section 84 kg
Weight of the lift car 1400 kg
Operation temperature -25°C – +45 °C
Noise level to the surroundings [dB (A)] Max. 80 dB
Electrical DataSC2000K
Number of lifting motors 3
Motor rating 7,5 kW
Starting current 270 A
120 A 
Power consumption 22,5 kW 
Supply voltage 230/400 V  AC 50 Hz 
Lift control voltage
  • safety
  • control circuits
48 V AC
Lighting circuit voltage 230 V AC 50 Hz
Signal circuit voltage
  • lamps
  • buzzer 
  • 48 V AC
  • 12 V AC
Permissible voltage variation ±5 %
Fault mode current protection residual current device
Technical Data for the
Lift Car and Lifting Mechanism
SC2000K
Car (internal)
  • width
  • depth
  • height
  • weight
  • 1170 mm
  • 1170 mm
  • 2100 mm
  • 1400 kg
Mast section
  • length
  • load bearing tubes spacing
  • mast bolts
  • weight
  • 1508 mm
  • 650 mm
  • M20 x 190-10.9 - 4 pc./section
  • 84 kg
Electric motor
  • type
  • nominal power
  • rated speed
  • supply voltage
  • rated current
  • weight
  • 132M4 - NORD
  • 7,5 kW
  • 1445 [1/min]
  • 400/690 V - 50 Hz
  • 14,8 A
  • 84 kg
Brake
  • operating principle
     
  • type
  • braking torque
  • weight
  • Disk type,
  • electro magnetically released
  • BRE60HL1 - NORD
  • 60 Nm
  • 10 kg
Gear
  • type
  • gear ratio
  • weight
  • SK9042.1 VXF B5I - NORD
  • 1:15.66
  • 6 kg
Driving pinion
  • module
  • number of teeth
  • rotation speed
  • 6 mm
  • 20
  • 91 [1/min]
Safety brake
  • operating principle
  • type
  • tripping speed
  • weight
  • Progressive, centrifugal action
  • UC – 3.0 A
  • 0,9 m/s
  • 32,5 kg
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