Pile Drivers – Piling Hammers

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

Nor-Trade offers a wide range of hydraulic hammers from the small HPH1200 hammers with a total weight of 3000 kg (weight including sheet legs) and 12 kNm 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.

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.

Inserts

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.

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

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