EJOT® Concrete screws ETA-approved concrete screws for cracked and non-cracked concrete
Anchors and Installation Technology Concrete Screws
Installation instructions Installation equipment
Notes: JC2 8
JC2 10
Specification
JC2 6
Rotary hammer Drill bit Socket (SW) Additional tools
750…1200 r.p.m / 1.8 …3.3 J SDS+ 2-CUT or 4-CUT sizes 5, 6, 8, 10 mm 11 mm 13 mm 15 mm air pump/compressor, torque wrench, impact screw driver
Condrete and hollow core slab ll Concrete strenght is C20/25 to C50/60 Hollow core slabs C30/37 to C50/60 ll No significant voids in concrete. ll Concrete is well compacted. ll Thickness of concrete is according PDS installation data (see page 11). Installation (see page 10-11) ll Edge distances and spacing are according PDS installation data. ll Use proper air pump or compressor. ll Drill hole is deep enough (mentioned h1 in PDS installation data). ll All dust should be cleaned from the hole to avoid screw jamming during installation. ll Pay special attention to cleaning, especially when installing downwards. ll In case of aborted hole, drilling of new hole at a minimum distance of twice the depth of the aborted hole, or smaller distance provided the aborted drill hole is filled with high strength non-shrinkage mortar. No shear or oblique tension loads are allowed in the direction of a not filled aborted hole. Other base materials ll Concrete screw can be used also in other base materials such as clay brick, natural stone, perforated clay brick, solid sand-lime brick.
Installation data JC2 6
Specification
Approval Drill hole diameter Cutting diameter at the upper tolerance limit (max. diam. bit) Depth of drilled hole to deepest point Effective anchorage depth Nominal anchorage depth Diameter of clearance hole in the fixture Required torque Width across flats T-drive (in types KB and ST)
2
PART 6
JC2 8 OPT 1
-
JC2 10 OPT 1
-
OPT1
d0
[mm]
6
8
10
dcut,max ≤
[mm]
6.40
8.45
10.45
h1 ≥ hef hnom df ≥ Tinst SW
[mm] [mm] [mm] [mm] [Nm] [mm] T-
50 31.9 40
65 42.5 55
65 40.0 55
75 48.5 65
80 48.8 70
95 61.5 85
9 14 11
12 40 13
14 90 15
T30
T40
NA
Anchors and Installation Technology Concrete Screws
JC2 anchor installation
Through installation hmin
tfix SW T-Drive
Tinst
d0 df
hef hnom h1
Minimum thickness of concrete member. spacing and edge distance Cracked and non-cracked concrete
JC2 6
Approval Effective anchorage depth Nominal anchorage depth Minimum thickness of base material Minimum spacing Minimum edge distance Critical spacing for splitting failure and concrete cone failure (in case characteristic loading affects) Critical edge distance for splitting failure and concrete cone failure (in case characteristic loading affects)
Characteristic values Type JC2 6
JC2 8
JC2 10
hef hnom hmin smin cmin scr.sp scr.N ccr.sp ccr.N
[mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm]
PART 6 31.9 40 100 35 35 96 96 48 48
OPT 1 42.5 55 100 35 35 128 128 64 64
JC2 8
40.0 55 110 50 50 120 120 60 60
OPT 1 48.5 65 110 50 50 146 146 73 73
JC2 10
48.8 70 125 50 50 146 146 73 73
OPT1 61.5 85 125 50 50 184 184 92 92
Fire resistance R30 Tensile strength NRk, S, fi
0.24 kN
0.42 kN
1.02 kN
Shear force-carrying capacity (steel failure) VRk, S, fi
0.24 kN
0.42 kN
1.02 kN
Fire resistance R120 Tensile strength NRk, S, fi
0.12 kN
0.21 kN
0.54 kN
Shear force-carrying capacity (steel failure) VRk, S, fi
0.12 kN
0.21 kN
0.54 kN
3
Anchors and Installation Technology Concrete Screws
Installation instructions in pre-stressed hollow core slabs 1
2
d0
3
≥ 25 mm
≥ 50 mm
≥ 50 mm ≥ 100 mm
1. Locate rebars by means of suitable detector
2. Mark rebar location
4
3. Make a cylindrical hole
5
6 tfix
4. Clean the hole
= 0 mm
5. Install the screw anchor by impact screwdriver or torque wrench
6. Ensure that the screw anchor head fully rests without any gap on the fixture and is not damaged
lp
ap
ap
a2
a2
ap
admissible anchor position
Admissible anchor position in pre-stressed hollow core slabs Core distance Pre-stressing steel distance Distance between anchor position and prestressing steel
s1
ap
a1
s1
c1
lc
lc ≥ 100 mm lp ≥ 100 mm ap ≥ 50 mm
a2
c2
Minimum spacing and edge distance of anchors and distance between anchor groups in pre-stressed hollow core slabs Minimum edge distance Minimum anchor spacing Minimum distance between anchor groups c1, c2 = edge distance s1, s2 = anchor spacing a1, a2 = distance between anchor groups
4
a2
cmin ≥ 100 mm smin ≥ 100 mm amin ≥ 100 mm
Anchors and Installation Technology Concrete Screws
Basic loading data for precast pre-stressed hollow core slabs The data of these tables is based on: ll Concrete C30/37 to C50/60 ll Installation has been done correctly (see page 7). ll Edge distances and spacings acc. page 7.
Recommended loads Anchor size
JC2 6
Flange thickness db Loading for all directions FRec Rec. bending load MRec Edge distance ccr = cmin Spacing scr = smin The partial safety factor for action is γ = 1.4.
[mm] [kN] [Nm] [mm] [mm]
≥ 25 0.5
≥ 30 1.0 9.1 100 100
≥ 40 1.4
Fire resistance Design under fire exposure is performed according to the design method given in EOTA TR 020. The data of these tables is based on ETA-17/0835.
ll ll ll ll ll
Concrete C20/25, fck,cube = 25 N/mm² Values cannot be used with hollow core slabs Installation has been done correctly (see page 10) No influence on edge distances and spacings (see page 11) Respect of minimum base material thickness (see page 11)
Recommended loads JC2 6
Anchor size
Approval Effective anchorage depth hef
[mm]
Nominal anchorage depth hnom
[mm]
Fire Exposure R30 Tensile NRec Shear VRec Fire Exposure R120 Tensile NRec Shear VRec
[kN] [kN] [kN] [kN]
JC2 8
JC2 10
PART 6 31.9 40
OPT 1 42.5 55
OPT 1 48.5 65
OPT 1 61.5 85
0.24 0.24
0.24 0.24
0.42 0.42
1.02 1.02
0.12 0.12
0.12 0.12
0.21 0.21
0.54 0.54
The recommended loads under fire exposure include a safety factor for resistance under fire exposure γM,fi = 1.0 and the partial safety factor for action γF,fi = 1.0.
5