Underwater Maintenance

Underwater Concreting

Underwater concreting is widely used in today’s marine construction industry in the stabilization of various foreshores and harbors, plus other erosion areas in and around the tidal zones. Typically, this is achieved by filling foreshore stabilization mattresses (grout mattresses) of various sizes with a concrete grout mixture, which ultimately acts as a concrete blanket in and around tidal zones and the harbor bed which might be exposed to propeller wash from tugs and ships. The result is the prevention of erosion and embankment slippage.

In terms of strength and longevity, a well-placed concrete pour carried out underwater can be the equivalent of the same pour carried out topside.

 

Examples of underwater concreting uses include:

  • Structure foundations and slabs

  • Embankment stabilization

  • Pier and pylon footings and supplementation

  • Pipeline and cable encasement

Underwater High-pressure Water Blasting

Underwater high-pressure water blasting is a very effective means of cleaning and removing fouling or scale from underwater structures.

Examples of structures commonly cleaned using high-pressure water blasting include:

  • Pipelines and intakes

  • Commercial vessels

  • Bridge piles and piers (road and rail)

  • Dam outlet screens

  • Stop log guides and rails

  • Wharf structures

Diver-operated Dredging

Deep Dive Co. Ltd. is capable of providing a rapid response and turnkey operation for all forms of diver-operated airlifting and dredging projects. We own a wide range of specialty dredging equipment, suction and discharge hoses, and related equipment having performed numerous dredging operation projects throughout Saudi Arabia.

Underwater Cutting

Deep Dive Co. Ltd. provides underwater cutting services for the marine civil construction industry, programmed maintenance, emergency repairs and demolition of various water-located structures including such as piles, bridges, wharves, jetties, pontoons and piers.

We also provide extensive underwater cutting services to the commercial shipping industry.

Our experience is unrivaled and our range of equipment vast, enabling rapid, effective and efficient deployment and thus ensuring our clients incur the least-possible down time.

Underwater Welding

With Deep Dive Co. Ltd., underwater welding is a safe, reliable and cost-effective technique for temporary and permanent underwater repairs and construction. We are that committed to providing the very best underwater diving services that, no matter how experienced our commercial divers are, we diligently test new materials and methods in our own simulated underwater environment training tank in order to maximize the benefits of the very latest technology.

Underwater welding locations include, but are not limited to:

  • Bridge and piers

  • Ships hulls and coffer dam installation

  • Anode replacements

  • Power stations

  • Hydro stations

  • Water storage reservoirs

  • Pipelines

Underwater Drilling

We have the capability to drill into various materials such as metal, rock, reinforced concrete and timber. All of these materials require different drilling apparatus and techniques. Fine drilling, large-diameter and deep-drill lengths are also our specialty.

We frequently perform underwater drilling for the following tasks:

  • Structural investigation

  • Fixing and fastening

  • Crack stopping

  • Anode installation

  • Rope guard replacement

  • Sea chest repairs

Sacrificial Anodes

Deep Dive Co. Ltd. manages the installations or replacement of sacrificial anodes in all marine applications including, shipping, wharf and bridges. These installations can simply involve unbolting the old depleted anodes and bolting on new units. Concrete chemical anchoring systems can also be used underwater for developing a secure platform to bolt the anode to. In most shipping applications, our divers conduct underwater wet welding to secure the anode straps to the vessels shell plating.

The advantages of sacrificial anode’s are:

  • No external power sources required.

  • Relatively easy to install.

  • Lower voltages and current, mean that the risk of causing stray current interference on other structures is low.

  • Require less-frequent monitoring than impressed-current cathodic protection systems

  • Relatively low risk of over protection.

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