37
7.4.4 Handling and installation of threaded RD pile
sections and threaded sleeves
7.4.4.1 Reception and inspection
Pile sections are delivered to site with the taper threads
lightly oiled for protection and covered in plastic sheeting.
The correspondence of the materials and dimensions of pile
products to designs must be checked during reception.
The splice sleeve of an RDs pile is longer than that of
an RD pile of the same size and has an unthreaded
straight portion at both ends. The RDs pile section has a
corresponding straight machined portion, which the RD
pile section does not have. The splice sleeves of RD and
RDs piles must not be mixed between pile types.
It must also be checked that the threaded portions of pile
sections have not been damaged in any way. Removal
of protections from threaded sleeves and unnecessary
cutting open of bundles of pile sections must be avoided
before installation.
7.4.4.2 Thread handedness
The equipment used in pile installation determines the
threading of piles. With DTH equipment, the direction
of rotation of the drill bit is clockwise. Thus, the pile also
tends to rotate clockwise during installation. In order
to ensure that the splices hold, the threads of piles
and sleeves must be left-handed. With top hammer
equipment, the direction of rotation of the drill bit is
counterclockwise meaning that the threads of piles and
sleeves must correspondingly be right-handed.
Handedness can also be checked by turning the sleeve onto
the pile. A right-hand thread tightens when turned clockwise.
A left-hand thread tightens when turned counterclockwise.
7.4.4.3 Transport and storage
Pile sections are to be handled in transport and on site
so that threads are not damaged. They can be stored
outdoors, but are to be covered by tarpaulins to prevent
rusting of threads. The tarpaulins should be placed so as
to allow the bundles of piles to dry. It is recommended
that threaded sleeves are stored indoors.
Careful handling and storage of pile products prevents
damage to them and ensures smooth installation of splices.
7.4.4.4 Installation
Drill bits
It is recommended to ensure before drilling starts that the
outside diameter of the used ring bit is compatible with
the outside diameter of the splice sleeve. Table 27 shows
drill bits recommended for normal soil conditions. In case
the soil contains hard to penetrate obstacles like wood
piles or concrete structures, special-purpose bits are to
be used as deemed necessary.
Note: All ring bits are for DTH hammer equipment except those marked with an asterisk (*), which are meant for top hammer drilling equipment. When using
a DTH hammer, the threads of the pile pipe and the sleeve are left-handed, but right-handed when a top hammer is used.
** RD270 and RD320 pile sizes have welded threaded splice pieces without separate sleeve
Table 27. Dimensions, tightening torques and recommended reamer bit types and sizes of threaded sleeves.
Pile products
Drill bits
RD pile
Splice sleeve
RDs pile
Splice sleeve
Required
tightening
torque of
splice,
RD and RDs
piles [kNm]
Epiroc
Outside
diameter
of ring
bit
[mm]
Robit
Outside
diameter
of ring
bit
[mm]
d
[mm]
L
[mm]
d
[mm]
L
[mm]
RD90/6.3
-
-
RDs90/6.3
-
-
-
Symmetrix P89/6.3-54 *
107
ROX+ XL 88.9/8 *
105
RD115/6.3
-
-
RDs115/6.3
-
-
-
Symmetrix P114/8-61
132
DTH PRIME 114.3/10
135
Symmetrix P114/10-75
129
RD115/8
127
120
RDs115/8
127
150
1
Symmetrix P114/8-61
132
Symmetrix P114/10-75
129
RDs125/6.3
-
-
-
-
-
DTH-ROX+ XL 127/10
145
RD140/8
152.4
140
RDs140/8
152.4
180
1
Symmetrix P140/10-82
158
DTH PRIME 139.7/10
161
Symmetrix P140/10-100
160
RD140/10
152.4
140
RDs140/10
152.4
180
1
Symmetrix P140/10-82
158
Symmetrix P140/10-100
160
RD170/10
181.9
180
RDs170/10
181.9
210
1
Symmetrix P168/12.7-103
188
DTH PRIME 168.3/12.7
191
Symmetrix P168/12.7-125
190
RD170/12.5
181.9
180
RDs170/12.5
181.9
210
1
Symmetrix P168/12.7-103
188
Symmetrix P168/12.7-125
190
RD220/10
234.9
180
RDs220/10
234.9
210
3
Symmetrix P219/12.7-146
240
DTH PRIME 219.1/12.7
241
Symmetrix P219/12.7-171
242
RD220/12.5
234.9
180
RDs220/12.5
234.9
210
3
Symmetrix P219/12.7-146
240
Symmetrix P219/12.7-171
242
RD270/10**
298.5 250
3
Symmetrix P273/12.7-227
302
DTH PRIME 273/12.7
303
RD270/12.5**
298.5 250
3
RD320/10**
355.6 260
RDs320/10**
355.6
260
3
DTH PRIME XL2
323.9/12.7
375
RD320/12.5**
355.6 260
RDs320/12.5**
355.6
260
3