Page 18 of European Technical Approval ETA-11/0390, issued on 27.08.2012
English translation prepared by CSTB
of the European
Technical Approval
ETA - 11/0390
Injection System Hilti HIT-CT 1 for rebar connection
Table 3:
Minimum concrete cover min c
1)
of the bonded-in rebar or tension anchor
HZA-R depending on drilling method
and drilling tolerance
Drilling method
Bar diameter d
s
Without drilling aid
With drilling aid
Hammer drilling
(HD) / (HDB)
24 mm
30mm + 0,06
v
2 d
s
30mm + 0,02
v
2 d
s
25 mm
40mm + 0,06
v
2 d
s
40mm + 0,02
v
2 d
s
Compressed air drilling
(CA)
24 mm
50mm + 0,08
v
50mm + 0,02
v
25 mm
60mm + 0,08
v
60mm + 0,02
v
1)
See Figures 10 and 12 (Annex 5 and 7). The minimum concrete cover according to EN 1992-1-1 must be observed
Table 4:
Minimum anchorage length
1)
and lap splice length for C20/25 to C50/60 for good bond
conditions and maximum installation length l
max
Rebar
Drilling method
HD, CA
Ø d
s
f
y,k
l
b,min
[mm]
l
0,min
[mm]
l
max
[mm]
[N/mm²]
C20/25
C25/30
2)
C30/37-
C50/60
3)
C20/25
C25/30
2)
C30/37-
C50/60
3)
[mm]
8
500
113
120
140
200
240
280
700
10
500
142
145
152
200
240
280
700
12
500
170
174
183
200
240
280
700
14
500
199
203
213
210
252
294
700
16
500
227
232
244
240
288
336
700
18
500
255
261
274
270
324
378
500
20
500
284
290
305
300
360
420
500
22
500
312
319
335
330
396
462
500
24
500
340
348
365
360
432
-
500
25
500
355
363
381
375
450
-
500
1)
according to EN 1992-1-1: l
b,min
(8.6) and l
0,min
(8.11) with maximum yield stress for rebar BSt 500S,
with
M
= 1,15 and α
6
= 1,0
2)
according TR 023, Section 4.2 an increasing factor 1,2 for C25/30 is included
3)
according TR 023, Section 4.2 an increasing factor 1,4 for C30/37 to C50/60 is included
Table 5:
Design values of the bond resistance f
bd
1)
in N/mm² for all drilling methods for good bond
conditions
Rebar-Ø
Concrete class
d
s
C12/15
C16/20
C20/25
C25/30
C30/37
C35/45
C40/50
C45/55
C50/60
8 to 25 mm
1,6
2,0
2,3
2,7
3,0
3,0
3,0
3,0
3,0
1)
Tabulated
values for f
bd
are valid for good bond conditions according to EN 1992-1-1. For all other bond conditions
multiply the values for f
bd
by 0.7.
Annex 8
Minimum concrete cover min c,
minimum anchorage and lap splice length,
maximum installation length
Design bond resistance
Drilling aid
