SWDM240B OPERATION & MAINTENANCE MANUAL
1.3 EQUIPMENT STABILITY
The distance from the center of the device to the axis of the borehole is
3793～4600
mm.
The stability of the equipment is based on the following conditions, calculated according
to European standards EN791.
Spiral Kelly (drilling diameter 1m
）
Pressurization Kelly (crowd stroke 5m)
Spiral drill bit (drilling diameter 1m
）
1.3.1 General Conditions
The specific operation steps of mobile hole position are detailed in “5.5.5 Translocation”
General conditions：
1 The equipment upper-carriage is in a straight line with the caterpillar.
2 Rotary head and drill bar are as low as possible.
3 The ground or working platform on the site must be a solid horizontal plane.
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