DROMEC builds series of Pull-In Systems

Van Oord is a leader in offshore wind farm construction. The company is responsible for the cable pull-in operation for the Sofia Offshore Wind Farm project located on the Doggersbank in the North Sea. This operation involves providing the wind turbine with power cables to transport the generated energy. In 2019, DROMEC delivered a special series of 10 user-friendly pull-in systems for this application and is now supplying another series of 10 systems.

Stefan Graat, Project Engineer at Van Oord:
“Dromec provides Van Oord Offshore Wind with equipment, support, and services that make a significant contribution to successful cable projects!”

Pull-In System

The pull-in system, developed specifically by DROMEC, is used to draw the thick power cable from the ship into the wind turbine. It is a complex tool designed for this purpose. Specific variants have been designed for different continental areas. For instance, in the waters of the United Kingdom, additional safety standards are required, such as LOLER and PUWER.

Constant Tension

Before installing the wind turbine on the platform, the pull-in operation takes place. The cables are pulled from the ship through the seabed into the platform using the DROMEC pull-in system. This system features a constant tension function, ensuring that the cable is always kept at a preset tension, even when unexpected changes in cable force occur. This prevents cable overload. This special tool has a nominal pulling force of 10 tons, which is maintained through friction between the rope and a special capstan head. The combination of the number of wraps and a fairlead ensures the safety of the pulling force up to a holding force of 12 tons.

Pieter, engineer DROMEC:
“We designed this compact pull-in system specifically for operations of this kind, and since then, the demand from various customers has significantly increased. It’s a user-friendly tool that can be installed for any pull-in operation on a random platform. The combination of its low weight and high force, along with advanced control software, provides real time savings for the customer. The system can be used both in a standing and hanging configuration. Various improvements have been made for the new series, such as the nominal pulling force and the hard-anodized capstan head. This material is more resistant to corrosion. The frame is also more user-friendly with an integrated lifting eye and an additional guide bracket, allowing the cable to wind on and off at a 70-degree angle.”

Automatic Tensioning

The system operates with automatic tensioning. A fairlead that runs in sync with the capstan head through the control system ensures a consistent tension between the fairlead and the capstan, guaranteeing the pulling force by the capstan without the need for a person to hold the loose end continuously. The system is electrically powered, compact, and lightweight, weighing 550 kg. It weighs 475 kg without the detachable fairlead. Once the operation is complete, the system is moved to the next wind turbine platform.

DROMEC Winches develops ingenious winch system

Cordeel Netherlands is involved in a wide range of construction projects, from residential to commercial. They work in various sectors, focusing on sustainable building and customized solutions for new constructions. For the Clubhouse Boompjes project in Rotterdam, WVH Facade Technology approached DROMEC Winches to develop an ingenious winch system for the construction of the residential towers.

Winch System for Residential Towers

Cordeel Netherlands, in collaboration with WVH Facade Technology, is constructing two residential towers in Rotterdam, with heights of 100 and 70 meters. The bare concrete structures are being further developed using finished facade elements. These 1200 kg facade elements are lifted into place using a DROMEC winch system. What sets this system apart is the bottom-up assembly of the residential tower, with each floor being progressively expanded in 5 steps.

Electric Drive

WVH designed the residential towers with floor grooves to facilitate the lifting of facade elements. On each floor, two winch systems with a combined lifting capacity of 2 tons are installed in lifting frames. These lifting frames can extend up to 1.5 meters and are stabilized. On the ground floor, two tagline winches are in place to maintain Constant Tension on the element in the correct position. As the element reaches its destination, it is slid into place using the lifting frames. DROMEC Winches also integrated a third lifting frame into this design, providing the ability to lift ceiling elements. All winch systems are electrically driven, which is of significant environmental importance in cities like Rotterdam.

Constant Tension

In this ingenious winch system, the control system plays a pivotal role, as all components must work in harmony to ensure a safe working environment. The three lifting frames can be operated simultaneously with a single joystick, and they can also be controlled individually for fine-tuning the lifting operation. The Constant Tension tagline winches on the ground floor can be operated remotely through the control system.

Gijs, the engineer, states,
“The winch systems working together allow for very precise positioning of facade or ceiling elements through Constant Tension. This is especially significant in urban areas with high-rise buildings.”

Compact and Safe

The winch system is designed to be highly compact and can be placed in the construction elevator. Each lifting frame, weighing 1000 kg, is equipped with wheels for easy mobility. The winch system has a cable storage capacity of 110 meters and is secured with a Dyneema chain. In case of cable breakage, the Dyneema chain serves as a safety measure. With this winch system, DROMEC Winches has once again elevated the bar for their projects.

DROMEC winches. Your movement in good hands.

Dynamic and Innovative in winches, winchsystems, controls and software. With our enthousiastic team, we develop  from small till  very big & complex systems with the highest demands in terms of safety and ease of use. We also work very closely with certified body’s as DNVGL, BV, ABS, Lloyds so your winches and systems can be completely certified at our own company together with you.

It often starts with a good idea, preferably on a piece of scrap paper. After an initial consultation, we prepare one or more proposals, including a target price and preliminary drawing. Your idea or problem, always remains central in this. If the feeling on both sides is good, we start. Thanks to our own inhouse developed and written project software, your project stays in the picture and under control from start to finish, including the planning and delivery time. We are LloydsRegister ISO 9001 certified.