Dawson Construction Plant produce hydraulic double acting percussion hammers, whereby the ram weight is driven both vertically upwards and downwards by hydraulic pressure delivered from a purpose built Dawson power pack. This double action ensures that the power to weight ratio of the hammer is as efficient as possible, and results in the hammer being much more powerful than a hammer having a single acting ram weight of the same size. The double action operation produces rapid blow rates, which in addition to increasing production assist with better penetration into harder soils and soft rock than slower hammers.

• Unrivalled production rates - rapid blow rates saves time and money, whole project is shortened
• Rapid blow rates - 'chisel' through compacted sands, out driving much heavier slower hammers
• High energy transfer efficiency to the pile - smaller hammer outperforms older more cumbersome equipment
• Optimum energy output - potentially damaging high impact velocities are avoided by careful selection of ram mass; specially important with concrete piles

 

• Variable energy output - infinitely adjustable between min/max at the touch of the button, any time during the drive
• Blow control at the touch of a button - from single blows at the start of the drive to automatic blows for rest the operator has total control for a quality pile install
• Versatility - all hammers are designed to be truly multi-tasking so as to meet the demands of the modern contractor
• All hydraulic operation - the absence of electronic components produces simple and reliable functionality
• Compact enclosed design - simplifies application and handling whilst protecting vital components
• Simple integration with alternative power sources - can be operated from hydraulic excavators, hydraulic crawler cranes or non-Dawson hydraulic power packs.

Specification	Units	HPH1200	HPH1800	HPH2400	HPH4500	HPH6500	HPH10K	HPH12K	HPH15K
Ram weight	kg	1,040	1,500	1,900	3,500	4,650	8,000	10,000	12,000
Impact velocity	m/s	4.76	4.99	4.98	5.05	5.25	5.00	5.00	5.00
Maximum Pile Energy	kg.m	1,200	1,900	2,400	4,500	6,500	10,000	12,000	15,000
Maximum momentum	kg.m/s	4,950	7,485	9,462	17,675	24,413	40,000	50,000	60,000
Blow rate	bpm	80-120	80-120	80 - 120	80 - 120	80 - 120	80 - 120	80 - 120	80 - 120
Length - lead mounted	mm	3,800	3,930	4,430	4,650	5,350	6,500	6,500	6,500
Length - free hanging w/legs	mm	4,670	5,050	5,300	5,500	6,458	-	-	-
Length - free hanging w/guide	mm	-	-	-	5,597	6,310	7,500	7,500	7,500
Weight - lead mounted	kg	3,000	4,250	6,000	8,500	10,400	15,000	17,000	19,000
Weight - free hanging w/legs	kg	3,000	4,250	6,000	10,750	14,600	-	-	-
Weight - free hanging w/guide	kg	-	-	-	10,000	13,500	23,000	25,000	27,000
Weight - ram removed for transport	kg	-	-	-	-	-	11,000	13,000	15,000
Power Pack
Diesel engine power	kW hp	40 54	50 67	68 90	129 173	150 200	400 536	400 536	400 536
Hyd system pressure	bar psi	230 3,300	230 3,300	230 3,300	255 3,700	260 3,800	180 2,610	220 3,190	260 3,770
Oil flow rate	l/min gpm	75 20	105 28	150 40	230 61	260 69	750 200	750 200	750 200