Marine Services

In this field we can offer a range of services and equipment, as a completary to our other fields of works. This to provide service to our clients in the most efficient way.

we can offer a complete undertaking relating to new constructions, temporary- and repair works in water or in the vicinity.

We can also offer a broad range of services using our own large pool of plant and equipment, such as piling, light house installations, foundations, cable and pipe installations, etc.

Erosion protection for quays and constructions under water

Erosive forces from ship propellers affects the ground material next to sheetpiling, slopes and other foreshore protections. This can effect and endanger the construction’s stability.

One way to deal with this is to secure the bottom with some kind of erosion protection. An effective and safe system is achieved by using linked concrete plates in combination with concrete cast on site. The link plate has a unique design which allows it to adjust to future effects of erosion powers. Gabions, wire mesh mattresses filled with stones, is also a method used frequently in order to withstand erosion.

Cathodic protection for steel constructions

Corrosion of steel constructions under water usually appears as cavity corrosion. Corrosion speeds of 0.3 to 0.4 mm/year is not unusual. Complete penetration of piling due to corrosion can appear in as little as 20-25 years. This may result in washing out of filler materials and can cause subsidence and underwashing of the quay structure.

The highest corrosion rate usually appears between the surface and a depth of 1 meter. The corrosive attack can effectively be stopped if cathodic protection is installed: this can be done at any time during the lifetime of the construction. To ensure that the required effect has been achieved, potential measuring can be performed.

Repair of quays and other underwater construction works

We also have extensive experience with most other types of assignments,such as:

  • Welding of collision damages
  • Underwater steel cutting
  • Various types of concrete work
  • Repair of concrete and steel piles
  • Installation of surface water outlets
  • Installation of fenders
  • Concrete core drilling and wire sawing
  • Blasting Etc

Contact us

We strive to meet your requirements and that you should always get a final product of the right quality. We believe that our expertise and our flexibility combined with a positive spirit will help us to ensure the requirements you may have against us.

Closure

When various actions need to be taken in a power plant the waterways must on many occasions be barraged and drained.

There are several different actions taking place in connection with a closure where we can offer to participate to ensure work is carried out efficiently and rationally by, for example:

Cleaning and excavation in front of sluices
Installation of bumper beams
Installation of needles or compositors

Concrete works

The concrete intake and outlet ducts in a power station are exposed to great stress.

As an alternative to closing down we can offer to perform a large part of this work under water, including:

Repair of slopes
Repair of glacises
Repair of intake ducts and sluices
Repair of suction pipe
Etc

Our service at bridge constructions

We have with our diving technique and our competence participated in practically every bridge project relating to alterations of the E6 and West Coast Railway through the County of Halland during the 90’s.

These assignments have included various details which have placed great demands on professional skills and flexibility within the organisation. We have, for example carried out:

  • Excavations inside and outside of piles
  • Cutting of concrete and steel piles
  • Reinforcement of foundation plates
  • Casting of bridge foundation
  • Laying of erosion protection
  • Etc

Manitou 2150 Teleskoplastare

A flexible work machine with both winsch and  load forks that can be set up to work either by trailer or if the distance is not too far away, using its own propulsion. The telescopic handler is ideal for work in ports and quays, or on board our Marine resources with great flexibility.

Technical data:

Built: 2008
Lifting capacity load forks: 5000 kg
Lifting capacity vinsch : 3000 kg
Type of boom: Hydraulic
Max liftheight: 20,6 m
Horisontell distance : 12,65 – 18, 1  m
Engine: Mercedes Benz 150 hk
Own weight: 16,4 ton
Max speed: 36 km/h

Piling for bridges and similar

One of our specialities is to drive piles and build bridges. Our piling equipment is effective and easy to use.

For this we use our hydraulic hammer with a blow of 1800 joule and 450 strokes per minute. The hydraulic hammer weighs 1100 kg. It can drive down a heavy rail in solid materials such as limestone rock and similar. We have guides for different types of piles.

A 12 m high stump-mast, installed on our working catamaran Smart, saves time during major works.

The piling work can be made from Smart or from a smaller catamaran. It is also possible to perform the work with the help of our free-standing hydraulic aggregate and crane.

Piledriving

Our equipment is easy to use, and still effective.
Sheet piling is preferably executed from one of the working catamarans or from a land-based crane. We do of course have guides for different types of Steel sheet piledriving.

Contact us for details and quotation!

AQUA CUTTER PP 550

Hydrodemolitation is a fast and efficient method of concrete removal, without damaging surrounding structure and imbedded rebar.

Our PP 550 is installed in a 20 feet container wich provides fast and easy mobilisation.

Basic facts:

  • Pressure, max: 1000 Bar
  • Waterflow: 227 L/min
  • Pump: Triplex pistonpump
  • Effect: 419 kW
  • Engine: Volvo TAD, 565 kW
  • Container: 20 feet
  • Weight: 9 tons
  • Built: 2003

Sheet pile driving

Submerging cables and pipes in the bottom material is an effective way of protecting these expensive constructions.

We are specialised in burying cables and have developed this method based on our knowledge of flow technique and hydrodynamic transport of muddy materials.

With this equipment we wash up a cable trench in the sea bottom, lower down the cable and let the bottom material sink back and cover the cable.

The construction consists of a steel frame on wheels and works with water pumps on board the ship, to which it is connected with hoses.

The depth of the cable trench can be adjusted to between 0.5 and 2 m.

Miscellaneous service at power plants

A number of other tasks can be performed under water in order to minimise the downtime and to have the opportunity to plan the maintenance rationally, including:

Cleaning of intake screens
Installation of intake screens
Installation of flow meter
Installation of wells and pipe to water level gauge
Status evaluation of dams and other constructions