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The Perfect Tool for driving short piles into sands and gravels...

dawson_emv

Experienced pile drivers will confirm that driving relatively short piles using traditional methods is expensive. Mobilising cranes and suspended pile driving equipment together with the need for temporary guide frames or templates is something of a sledge hammer to crack a nut.
The solution is to grab hold of the pile head with a hydraulic clamp on the end of an excavator boom. This means you can manuover the pile head around until it is exactly where you want it. You then need a vibrator between the boom head and the hydraulic clamp to provide linear vibrations which, in conjunction with the excavators crowd force (shove), will stuff the pile into almost any ground conditions.

This is exactly what the Dawson EMV's do!

You can also pull the piles out with this tool and, if you run into obstructions, simply detach the vibro, put the bucket back on and hook it out.

Generally you only have 5 to 9 metres (15' to 30') of headroom under the bucket so this limits the pile length. Longer piles should be driven using more conventional equipment - they have to be accurately pitched and never horsed around afterwards.

 


Specifications of the EMV Product Range

 

SPECIFICATION

UNITS

Vibro Model

EMV70

EMV300

EMV300A

EMV450

EMV550

STATIC MOMENT

in.lbs

60

400

400

606

674

kgm

0.7

4.6

4.6

6.9

8.3

FREQUENCY

vpm

3,000

2,400

2,400

2,460

2,500

CENTRIFUGAL FORCE

lbs

15,730

67,420

67,420

100,000

125,592

kN

70

300

300

450

550

AMPLITUDE - PEAK TO PEAK

vins 

0.134

0.58

0.58

0.5

0.51

mm

3.4

14.7

14.7

12

13

MINIMUM REQUIRED FLOW RATE

gpm

8

35

35

52

68

l/min

30

130

130

195

256

MAXIMUM ALLOWABLEFLOW RATE

gpm

32

67

67

94

107

l/min

120

250

250

350

400

MINIMUM HYDRAULICPRESSURE

psi

3,480

4,060

4,060

3,915

3,625

bar

240

280

280

270

280

MAXIMUM HYDRAULICPRESSURE

psi

5,076

5,076

5,076

5,076

5,076

bar

350

350

350

350

350

MINIMUM HYDRAULICMOTOR POWER

hp

16

80

80

118

160

kW

12

60

60

88

120

DYNAMIC MASS INCL. UNIVERSAL CLAMP

lbs

900

1,380

1,380

2,240

2,576

kg

410

625

625

1,008

1,150

TOTAL MASS NCL. UNIVERSAL CLAMP

lbs

1,150

2,112

2,123

2,834

3,360

kg

520

960

965

1,275

1,500

MAXIMUM PILE MASS

lbs

1,760

1,760

1,760

2,240

3,136

kg

800

800

800

1,000

1,400

MAXIMUM PUSH/PULLLOADING

lbs

6,171

17,600

33,600

33,600

49,500

kg

2,800

8000

15,000

15,000

22,500

TYPICAL EXCAVATORWEIGHT

Ton

5.5 to 17

13 to 39

13 to 39

27 to 50

33 to 60

Tonne

5 to 15

12 to 35

12 to35

25 to 45

30 to 55

CLAMP FORCE

Tonne

30

36

36

54

66

DIMENSIONS mm (inch)

A

360 (14.2)

560 (22)

615 (24)

615 (24)

750 (29.5)

B

25 (1)

25 (1)

25 (1)

32 (1.25)

40 (1.5)

C

250 (10)

250 (10)

250 (10)

230 (9)

230 (9)

D

455 (18)

582 (23)

582 (23)

640 (25)

850 (33.5)

E

340 (13.4)

429 (17)

429 (17)

510 (20)

560 (22)

F

672 (26.5)

816 (32)

927 (36.5)

945 (37)

985 (39)

G

942 (37)

1085 (43)

1200 (47.25)

1250 (49)

1473 (55)

H

150 (6)

150 (6)

150 (6)

160 (6.4)

195 (7.7)
 
 
 

What do you need?

 An excavator, wheeled or tracked, with adequate hydraulic power

Simply remove the bucket off the excavator and pin on the EMV using appropriate shafts, spacers and washers to ensure adequate strength and minimum slack.

Connect up the bucket cylinder hoses to the EMV, and run a drain line from the EMV back to the base machine hydraulic oil tank.

Sequence valves control the rest. Operate the bucket cylinder control lever and the clamping cylinder will close. Leave it in position and the cylinder will come up to pressure, keep the lever in position and the sequence valve will then direct oil flow to the motor which will start up vibrations.

Centre the bucket cylinder control lever and the motor runs down to a stop. When the motor has stopped turning the hydraulic clamp can be released by operating the bucket in the opposite direction - HAVING FIRST ENSURED THAT IT IS SAFE TO DO SO.