12
2.7 Bearing plates
Usually a bearing plate is installed at the upper end of RR/
RRs, RD/RDs and CSG-RR micropiles to transfer loads
from the superstructure to the pile. Standard bearing
plates are centralized on the pile shaft by an internal
sleeve, which serves to keep the bearing plate in place
during the construction phase. It is not designed to
withstand possible horizontal loads of the pile. The plate
of standard bearing plates is made of steel S355J2. The
standard sizes of bearing plates are shown in Table 12.
Table 12 presents the suggested design strengths
R
d
of
the bearing plates. It is recommended that the strength of
the bearing plate be verified both as to the steel structure
of the bearing plate and the compressive strength and
punching shear capacity of the concrete on top of the
bearing plate when the design value of load is about 90
to 100% of the design value of the strength of the bearing
plate and when using concrete strengths C30/37 to
C35/45.
Bearing plates may also be made based on specific site
designs in dimensions and shapes different from standard
bearing plates, for example, with a hole.
2.8 Pile dimensions and geometrical sectional
properties
The dimensions and geometrical sectional properties of
longitudinally welded RR and RD micropiles are presented
in Table 13 and those of spirally welded large diameter RR
and RD piles in Table 14.
Table 13. Dimensions and geometrical sectional properties of RR
®
and RD
®
micropiles.
A
A
u
A
b
= Area of steel cross-section
= Pile surface area
= Area of pile toe
Z
I
W
el
= Pile impedance
= Moment of inertia
= Elastic modulus
Sectional properties incl. corrosion allowances
of 1.2 mm and 2.0 mm
D
[mm]
t
[mm]
M
[kg/m]
A
[mm
2
]
A
u
[m
2
/m]
A
b
[mm
2
]
W
el
[cm
3
]
I
[cm
4
]
EI
[kNm
2
]
Z
[kNs/m]
A
1,2
[mm
2
]
A
2,0
[cm
4
]
I
1,2
[cm
4
]
I
2,0
[cm
4
]
EI
1,2
[kNm
2
]
EI
2,0
[kNm
2
]
76.1
6.3
10.8
1382
0.24
4548
22.3
84.8
178
56.1
1099
916
65.0
52.8
137
111
88.9
6.3
12.8
1635
0.28
6207
31.6
140.2
295
66.4
1304
1089
108.4
88.7
228
186
101.6
6.3
14.8
1886
0.32
8107
42.3
215.1
452
76.6
1508
1260
167.4
137.4
351
289
114.3
6.3
16.8
2138
0.36
10261
54.7
312.7
657
86.8
1711
1432
244.5
201.4
514
423
114.3
8.0
21.0
2672
0.36
10261
66.4
379.5
797
108.5
2245
1966
311.3
268.2
654
563
127.0
6.3
18.7
2389
0.40
12667
68.7
436.2
916
96.9
1914
1603
342.3
282.7
719
593
139.7
8.0
26.0
3310
0.44
15328
103.1
720.3
1513
134.4
2788
2445
595.1
515.2
1250
1082
139.7
10.0
32.0
4075
0.44
15328
123.4
861.9
1810
165.4
3553
3210
736.7
656.8
1547
1379
168.3
10.0
39.0
4973
0.53
22246
185.9
1564.0
3284
201.9
4343
3928
1344.1
1202.7
2823
2526
168.3
12.5
48.0
6118
0.53
22246
222.0
1868.4
3924
248.4
5488
5073
1648.5
1507.1
3462
3165
219.1
10.0
51.6
6569
0.69
37703
328.5
3598.4
7557
266.7
5748
5205
3110.9
2794.7
6533
5869
219.1
12.5
63.7
8113
0.69
37703
396.6
4344.6
9124
329.4
7292
6749
3857.0
3540.9
8100
7436
273.0
10.0
64.9
8262
0.86
58535
524.1
7154.1 15024
335.5
7238
6560
6207.9
5590.9
13037
11741
273.0
12.5
80.3
10230
0.86
58535
637.2
8697.4 18265
415.3
9205
8527
7751.2
7134.2
16278
14982
323.9
10.0
77.4
9861
1.02
82397
750.7
12158.3 25533
400.4
8645
7839
10574.7
9538.5
22207
20031
323.9
12.5
96.0
12229
1.02
82397
916.7
14846.5
31178
496.5
11012
10206
13262.9
12226.7
27852
25676
Table 12. Dimensions of standard bearing plates,
suggested design strengths of bearing plates.
Pile
Bearing plate
dimensions
[mm x mm x mm]
Suggested
design
resistance
R
d
[kN]
RR75**
150 x 150 x 15
380
RR/RD90**
150 x 150 x 15
450
RRs100/6,3
200 x 200 x 20
200 x 200 x 25
700
780
RR/RD115/6.3**
200 x 200 x 20
780
RR/RD115/8**
250 x 250 x 25
910
RRs125/6.3
200 x 200 x 20
250 x 250 x 25
950
1080
RR/RD140/8 and
RR/RD140/10**
250 x 250 x 25
1240
RR/RD170/10 and
RR/RD170/12.5**
300 x 300 x 30
1810
RR/RD220/10**
300 x 300 x 30
2090
RR/RD220/12.5
300 x 300 x 30
2090
RRs/RDs220/12.5
350 x 350 x 35
2700
RR/RD270/10
350 x 350 x 35*
2700
RR/RD270/12.5
350 x 350 x 35*
2700
RR/RD320/10
400 x 400 x 30*
3480
RR/RD320/12.5
400 x 400 x 30*
3480
RR/RD270/10 S550J2H
400 x 400 x 30*
2950
RR/RD270/12.5
S550J2H
450 x 450 x 40*
3750
RR/RD320/10 S550J2H
450 x 450 x 40*
4050
RR/RD320/12.5
S550J2H
500 x 500 x 40*
4520
*) Product not in stock
**) Pile sizes RR75 to RR220/10 of steel grades S440J2H
and S550J2H with same bearing plates