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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.

SC300K Technical Data Overview

  • Main Components
  • Details
  • Technical Data
  • Electrical Data
  • Technical Data Lift Car and Lifting Mechanism
Description of THE SC300K  main components 
  • SC300K Lift
    SC300K Lift
    The lift is a functional complex and consists of the following main components:
     - ground station
     - lift car
     - lifting mechanism
     - mast and landings
  • SC300K Lift Ground Station
    SC300K Lift Ground Station
    The ground station (1) forms a closed car-like structure with a door on one side for access into the lift car. The ground station frame and wall structures are galvanizing steel.
    The door (3) structure is a two-leafed door opening in the middle towards the landing. The door is equipped with a locking device (4), which allows the door opening only when the car is at the ground station. The door is opened manually. The door and the locking device are controlled with limit switches. At the ground station there also is a push button box for calling the lift car.
  • SC300K Mast Section
    SC300K Mast Section
    The cross profile of the mast sections forms a rectangle, hot galvanized, welded structure with square guide pipes in the corners. The interval of the guide pipes is 650 mm.
  • SC300K Landings
    SC300K Landings
    The landing doors (1) are two-leafed doors opening in the middle towards the landing. The door is equipped with a locking device (2), which allows the door opening only when the lift car is by the landing doors.
    The landing door is opened manually. The landing doors and the locking device are controlled with limit switches. By the landing doors, there also is a push button box for calling the car to the landing.
    Below the landing door threshold, there is a door opening wide and 750 mm high kick plate (3).
  • SC300K Lift Car
    SC300K Lift Car
    The lift car forms a closed car-like structure with a door on one side for access into the lift car. The lift car frame structures are hot galvanized steel and the wall structures are painted steel panels. The car door (1) structure is a two-leafed door opening inwards in the middle.
    The door is equipped with a locking device (2), which allows the door opening only when the car is at the ground station or by the landing door.
    Below the landing door threshold there is a door opening wide and 750 mm high kick plate (3). On the car roof there is a 400 x 600 mm sized roof gate (4), through which access to the car roof is allowed. On the roof, there are 1100 mm high safety railings (5) with an intermediate bar and a 150 mm high kick plate (6).
  • SC300K Drive
    SC300K Drive
    The lift’s lifting mechanism consists of one bevel gear, an electric motor and an electromagnetic brake. The motor brake has a hand lever, which in case of an emergency can be used for opening the motor brake to lower the lift car to the ground station or the next landing for safe exit from the car. The lifting mechanism is placed on the car roof.
Description of SC300K  main components 
  • SC300K Lift Shaft
    SC300K Lift Shaft
    The lift's ground station and the frame built under the mast are installed on a steel/ construction foundation. The shaft/ well under the lift is about 1500 mm deep.
    At the ground station, on the frame under the mast there are 2 safety buffers (2), which limit the lift car’s downward movement. The safety buffers prevent in all cases, the descent of the lift car onto the well bottom and leave a necessary space under the car.
  • SC300K Mast
    SC300K Mast
    The mast consists of mast sections with a length of 1508 mm. The mast sections are joined to each other with four M20 – 10.9 bolts and Nyloc nuts. The mast is fastened from the bottom to the ground station's frame structure and to the steel/ construction foundation under the lift. In addition to that, the mast is fastened to the wall structures. The anchor interval of the mast is about 3 m.
  • SC300K Safety Brake
    SC300K Safety Brake
    The safety brake (1) is placed on the car roof.
  • CS300K Safety Brake UC-3.0A
    CS300K Safety Brake UC-3.0A
    During emergency situations the safety brake stops the lift’s downward movement if the lift’s speed becomes faster than the release speed of the safety brake which is 0.9 m/s.
  • SC300K Door opening/Locking System
    SC300K Door opening/Locking System
    The door is equipped with a locking device, which allows the door opening only when the car is at the ground station or by the landing door. The door is opened manually. The door and the locking device are controlled with limit switches.
  • SC300K Load Control
    SC300K Load Control
    The lift is equipped with a load control device, which prevents starting of the lift if the lift is overloaded. The load control device consists of two sensors connected to an electronic control card.
Technical DataSC300K
Payload 300 kg or 3 persons
Speed 36 m/min
Lifting height 200 m
Max. free mast after topmost anchoring 0 - 1 m
Max. distance between anchors 1 - 3 m
Weight of the mast section 75 kg
Weight of the lift car 830 kg
Operation temperature -25°C  –   +40 °C
Noise level to the surroundings [dB (A)] Max. 80 dB
Electrical DataSC300K
Number of lifting motors 1
Motor rating 7,5 kW
Starting current 100 A
Nominal power 8,0 kW
Supply voltage 400 V / 50 Hz
Lift control voltage 48 V AC
Socket voltage 230 V AC 50 Hz
Signal circuit voltage 24 V DC
Permissible voltage variation ±5 %
Fault mode current protection residual current device
Technical Data for the
Lift Car and Lifting Mechanism
SC300K
Car (internal)
  • width
  • length
  • height
  • weight
  • 1043 mm
  • 775 mm
  • 2100 mm
  • 480 kg
Mast section
  • length
  • mast pipe distance
  • mast bolts
  • 1508 mm
  • 650 mm
  • M20 x 230-10.9 - 2 pc./section
Electric motor
  • type
  • nominal power
  • rotation speed
  • nominal voltage
  • nominal current
  • weight
  • 132M/4 - NORD
  • 7,5 kW
  • 1194 [1/min]
  • 400/690 V - 50 Hz
  • 15,5 A
  • 48 kg
Brake
  • operating principle
     
  • type
  • moment
  • weight
  • Disk type,
  • electro magnetically switched
  • BRE 100 SR HL
  • 100 Nm
  • 16 kg
Transmission
  • type
  • transmission ratio
  • weight
  • SK 9042.1 VF
  • 1:15,84
  • 110 kg
Lifting mechanism pinion
  • module
  • number of teeth
  • rotation speed
  • 6 mm
  • 20
  • 60 [1/min]
Safety brake
  • operating principle
  • type
  • releasing speed
  • weight
  • Sliding, centrifugal action
  • UC – 3.0 A
  • 0,9 m/s
  • 32,5 kg
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