Pile Drivers - Piling Hammers

2500 HAMMER 284x710

Dawson Hydraulic Impact Hammers – Pile Drivers

For Pile Foundation – Installation of Foundation Piles – Sheet Piling

For use freely suspended from crane or leader guided from excavator or piling machine

We offer a wide range of hydraulic hammers from the small HPH1200 hammers with a total weight of 3000 kg (weight including sheet legs) and 12kNm energy transfer to the large with a total weight of 35-40 tons (weight depending on pile sleeve) with an energy transfer of 150 kNm.

Model Range HPH1200, HPH1800, HPH2500, HPH6500, HPH10k, HPH12k og HPH15k

Rent or buy

For onshore and offshore

Dawson Hydrohammers are hydraulic, double action hammers with a high blow rate – 80-120 bl/min

The smaller hammers are well suited for sheet pile installations e.g. mounted on excavators, the largest for many offshore projects.

All hammers can operate under water.

Sheet legs or Sleeve

The smaller hammers are available with short sheet legs or long sheet legs. Short legs are normally used for hammers intended for leader guided operation and long legs for freely suspended operation.

HPH1200, HPH1800 and HPH2500 are with their relatively low weight and limited dimensions well suited for operation from an excavator. They are standard fitted with leg guides. With different leg inserts most sheet piles and steel profiles can be adopted. The HPH1800 and HPH2500 can with the right inserts install 430 mm ø, 530 mm ø and smaller diameter pipes too – please refer to the cross-sectional sketch beneath.

The HPH4500 and HPH6500 can be fitted with legs, but are – as the larger hammers – normally provided with a sleeve for installing pipes. A 36″ or 48″ sleeve covers all standard diameters up to 1214 mm. The HPH12k and HPH15k hammers are predominantly used for offshore projects.

With the wide range of hydraulic hammers from HPH1200 with 12 kNm energy transfer to HPH15k with 150 kNm energy transfer, and a variety of different inserts and pile sleeves, it is possible to find a Dawson hammer set that satisfies nearly any need.

Dawson Hammer configured as Sheet Piler


HPH6500 Hammer with Can (Sleeve)

Pile Driver-Pile Driving Equipment-Ramslag-Nortrade-Funderingsudstyr

HPH2400 Freely Suspended - Sheet Pile Configuration

Sheet Pile Installer

Hammer Characteristics


  • Fast blow rate (from 80 to 120 bl/min) for rapid pile penetration
  • Efficient energy transfer
  • Energy monitoring on screen
  • Full history of hammer performance
  • Intelligent stroke control
  • On screen fault diagnostics

An electronic control system constantly monitors the drop weight position. This allows the switching timing on the main hydraulic spool to be trended to continually optimise hammer performance under varying piling conditions, i.e. by hard driving with rebound, soft driving with a running pile etc.

Pile Driving Information


As the electronic system constantly monitors the position of the drop weight, the velocity of it is known.

As the mass of the drop weight is known, the energy output can be accurately calculated and is displayed on the powerpack interface screen.

All information is available on the screen and can be recorded directly to a laptop via special interface software from Dawson. It is saved in a standard spreadsheet format whereby a blow by blow account of every pile driven and a day to day productivity can be documentet.

Freehanging HPH1800 sheetpiling


Sheet legs with inserts for 300 and 450 mm ø

Spunsben føringer-Funderingshammer


The HPH1200, HPH1800 and HPH2500 are standard delivered with sheet legs. With different inserts mounted in the legs, different sheet pile types and steel profiles can be installed.

With the right inserts, pipes with different diameter up to 450 mm ø can be installed too. Please refer to the cross sectional sketch showing insert for pipes 300 mm ø and 450 mm ø.

The HPH4500 and HPH6500 are delivered with or without legs according to the cusomer’s choice. Without legs it will be delivered with sleeve.

HPH1800 Hammer with Inserts for Sheet Piling

HPH1800 E-2

Hammer on excavator - short legs

Hammer på mægler-korte ben

Hammer with Short Legs


Hammer test - Leader Guided, Short Legs

Pile Driver-Impact Hammer-Nortrade

Specifications – Hammers and Power packs

Hammers Dim. HPH1200 HPH1800 HPH2500 HPH4500 HPH6500 HPH10k HPH15k
Ram Weight kg 1040 1500 2040 3500 4650 8000 12000
Impact Velocity m/sec 4.76 4.99 4.98 5.05 5.25 5.00 5.00
Max. energy kNm 12 19 25 45 65 100 150
Blow Rate bl/min 80-120 80-120 80-120 80-120 80-120 80-120 80-120
Length, hammer mm 3800 3930 4430 4650 5350 NA NA
Length with legs mm 4670 5050 5300 5500 6458 NA NA
Length w/36” sleeve mm NA NA NA 5597 6310 NA NA
Weight, hammer kg 3000 4250 6000 8500 10400 NA NA
Weight w/ legs kg 3000 4250 7000 10750 14600 NA NA
Weight w/ 36”/48” sleeve kg NA NA NA 10000 (36”) 13500 (36”) 21000 (48”) 35000 (48”)
Power Packs
Engine Power kW 93 93 93 120 168 280 470
Hydraulic Pressure bar 240 230 230 250 270 250 280
Oil Flow l/min 75 105 150 230 270 490 850
Fuel Consump @ 60% l/h 15.2 15.2 15.2 19.9 28 55 78.6
Length cm 285 285 285 330 380 400 525
Width cm 134 134 134 134 150 170 220
Height cm 226 226 226 226 200 200 240
Weight kg 3000 3000 3000 3200 4800 7000 12000

HPH15k Hammer with Sleeve on Chaser


Free Hanging HPH2400 Hammer with Legs


HPH1800 Hammer with Legs on Barge

Pælehammer på flåde-rambuk

Power pack

The hydraulic oil supplied to the hammer comes from the power pack via a control valve mounted inside the top of the hammer. The valve switches the oil supply on or off at the upstroke side of the hydraulic ram i.e. oil supply “on” lifts the drop weight and oil supply “off” drops it.

For power pack specifications, please refer to the specification sheet above.

The Dawson hammers can easily be driven by alternative hydraulic systems, provided they are open systems, i.e. from:

  • Excavators or piling machines
  • Power Packs for hydraulic vibrators and other hydraulic hammers
  • Hydraulic cranes

Power Pack

Dawson Power Pck-Dawson kraftstation-Pælehammer

Hammer with Standard Legs

frithængende hammer-standard ben

Video: Dawson HPH2500 Driving Sheet Piles

Video: Dawson HPH6500 driving 1350 mm tubes

Video: Dawson HPH9000 working Subsee