Thursday 3 June 2010

Diving Operations

Introduction

Used in place of Cofferdams & Caissons

Can be used WITH cofferdams & caissons

Need to consider state of water

Is there a danger of blow-out?

If yes consider U/W operations

The deeper the water the more technology required and less complicated work achieved

Practicalities

Safety Regulations

Transportation of men and materials

Barges, pontoons, safety boats

Tide and current

Visibility

Depth

Nature and Extent of Work

Excavations

Crane & grab

Air lift & baskets

Concreting

Yes – requires special mix design

Formwork – same as on dry land

Tremi –pipe

Skip

Pumping

Sandbagging

Plant & Tools

Most Pneumatic tools can be used

Drills,scabblers, picks

Chainsaws

Cutters

Concrete vibrators

Bolt cutters

Cutting gear (oxy –hydrogen)

Thermic lances

Portable air-lifts

Lights & camera

CCTV

Ropes & shackles

Lifting bags

Diving Equipment

The diver:

Dry-suit and liner

Kirby-Morgan Band Mask

AGA Mask

Surface Demand

SCUBA

Diving Costs

DSV (Diving Support Vessel), 12 man team + vessel

£65K to £75K per day

Inshore civils work

up to £30,000 per day

Equipment costs:

Kirby Morgan helmet £5000

Complete diver kit £15000

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