Bonded Anchors P7-1 TENN / B + BTEC VDP Glass Capsule Anchors Due to their outstanding strength and versatility B + BTEC VDP Capsule Anchors are increasingly replacing mechanical expansion anchors in both new construction and existing structure renovation. Mechanical expansion anchors by design exert a radial force against the base material, creating expansion stresses that tend to split the concrete. VDP Capsule Anchors are non-expanding, so they do not set up expansion stresses in the base material. This makes them ideal for close bolt spacing or installing near concrete edges. VDP Capsule Anchors are capable of withstanding extremely high loads. They don’t vibrate loose nor back out of the hole under torque. On the other hand, expansion anchors slip under torque or axial loading; are unsuitable for vibratory loading; and ultimately are more expensive to use. DESCRIPTION B+BTEC VDP is a thin-walled glass capsule filled with liquid resin and quartz stone aggregate. Inside the capsule is a smaller glass capsule containing the resin hardener. A VDP anchorage is made by placing one or more VDP capsules in a hole drilled in concrete and then spinning the threaded rod bolt into the capsule. The rotary motion shatters the capsule and mixes the contents. Chemical interaction between the resin, aggregate, glass fragments, and resin hardener, produces a high strength adhesive that cures quickly to solidly bond the bolt to the surrounding concrete mass. The anchorage produced is suitable for all types of loading – static, vibratory and shock. ADVANTAGES • Pre-measured components guarantee correct mix composition. • Bolt centers itself in the VDP adhesive for full circumferential bonding. • Predictable and repeatable performance. • No loss of bond-strength over time (time-tested over 30 years). • Completely sealed anchor hole. • Economical method of anchoring stainless steel bolts. • Fire-safe anchorage possible with deeper embedments. • May be installed in dry or flooded holes, and even underwater. • Resistant to sea and rain water, oils and greases, most acids and alkalis. Cured VDP adhesive is non-toxic. • Long shelf life – 2 years from date of manufacture in original packaging. INSTALLATION PROCEDURE a. Drill hole to required diameter and depth. b. Blow out dust with oil-free compressed air. c. Brush sides of hole to loosen dust. d. Insert bolt to check for fit and depth. e. Repeat brushing procedure. f. Blow out residual dust. g. Insert VDP capsule. h. Spin bolt to bottom of hole using a power drill. i. Allow time for VDP adhesive to harden. Do not touch the bolt during hardening time. j. Fasten attachment. INSTALLATION ADVISORY • When working in oil contaminated areas, use a solvent to clean the hole. b a c d e f g h i j
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Bonded Anchors
P7-1
TENN/ B+BTEC VDPGlass Capsule Anchors
Due to their outstanding strength and versatility B+BTEC VDP Capsule Anchors are increasingly replacing mechanical expansion anchors in both new construction and existing structure renovation.
Mechanical expansion anchors by design exert a radial force against the base material, creating expansion stresses that tend to split the concrete. VDP Capsule Anchors are non-expanding, so they do not set up expansion stresses in the base material. This makes them ideal for close bolt spacing or installing near concrete edges.
VDP Capsule Anchors are capable of withstanding extremely high loads. They don’t vibrate loose nor back out of the hole under torque.
On the other hand, expansion anchors slip under torque or axial loading; are unsuitable for vibratory loading; and ultimately are more expensive to use.
DESCRIPTIONB+BTEC VDP is a thin-walled glass capsule fi lled with liquid resin and quartz stone aggregate. Inside the capsule is a smaller glass capsule containing the resin hardener.
A VDP anchorage is made by placing one or more VDP capsules in a hole drilled in concrete and then spinning the threaded rod bolt into the capsule. The rotary motion shatters the capsule and mixes the contents. Chemical interaction between the resin, aggregate, glass fragments, and resin hardener, produces a high strength adhesive that cures quickly to solidly bond the bolt to the surrounding concrete mass. The anchorage produced is suitable for all types of loading – static, vibratory and shock.
ADVANTAGES• Pre-measured components guarantee correct mix composition.• Bolt centers itself in the VDP adhesive for full circumferential
bonding.• Predictable and repeatable performance.• No loss of bond-strength over time (time-tested over 30 years).• Completely sealed anchor hole.• Economical method of anchoring stainless steel bolts.• Fire-safe anchorage possible with deeper embedments.• May be installed in dry or fl ooded holes, and even underwater.• Resistant to sea and rain water, oils and greases, most acids and
alkalis. Cured VDP adhesive is non-toxic.• Long shelf life – 2 years from date of manufacture in original
packaging.
INSTALLATION PROCEDURE
a. Drill hole to required diameter and depth.b. Blow out dust with oil-free compressed air.c. Brush sides of hole to loosen dust.d. Insert bolt to check for fi t and depth.e. Repeat brushing procedure.
f. Blow out residual dust.g. Insert VDP capsule.h. Spin bolt to bottom of hole using a power drill.i. Allow time for VDP adhesive to harden. Do not
touch the bolt during hardening time.
j. Fasten attachment.
INSTALLATION ADVISORY
• When working in oil contaminated areas, usea solvent to clean the hole.
ba c d e f g h i j
P7-2
APPLICATIONS
Steelwork – anchoring columns, beams and roof trusses.
Port and harbour installations – anchoring loading dock bumpers, bollards, cranes, rails.
High-rise construction – anchoring braces for scaffolding platforms, handrails, hoists and tower cranes; stonework facades.
Water supply and waste treatment projects – stainless steel anchoring.
EOTA = European Organisation for Technical Approvals
AISI = American Iron and Steel Institute
anchor = fastening system composed of steel bolt and adhesive compound
anchorage = result obtained by the use of the anchor: or assembly system consisting of fi xture, anchor and base material
NOTATION AND TERMINOLOGY
*Adhesive & Concrete Resistance at 50 °C Long term and 80 °C Short term.
BoltMaterial
Bolt Dimensions
d x l mm
Effective Embedment
Depthhef mm
CharacteristicSpacingscr mm
Characteristic Edge
Distanceccr mm
Characteristic Resistance
Design Resistance
TensionNRk,p kN
TensionNRk,c kN
TensionNRk,s kN
ShearVRk,s kN
TensionNRd kN
ShearVRd kN
5.88.8
A2-70 / A4-70
M8 x 110M8 x 110M8 x 110
808080
160160160
808080
202020
363636
181926
91513
999
7118
5.88.8
A2-70 / A4-70
M10 x 130M10 x 130M10 x 130
909090
180180180
909090
303030
434343
294641
152320
151515
111812
5.88.8
A2-70 / A4-70
M12 x 160M12 x 160M12 x 160
110110110
220220220
110110110
404040
585858
426759
213430
212121
162618
5.88.8
A2-70 / A4-70
M16 x 190M16 x 190M16 x 190
125125125
250250250
125125125
505050
717171
79126110
396355
262626
305035
5.88.8
A2-50 / A4-50
M20 x 260M20 x 260M20 x 260
170170170
340340340
170170170
757575
112112112
123196123
619861
404040
497849
5.88.8
A2-50 / A4-50
M24 x 300M24 x 300M24 x 300
210210210
420420420
210210210
909090
154154154
177282177
8814188
505050
7011270
5.88.8
A2-50 / A4-50
M30 x 360M30 x 360M30 x 360
280280280
560560560
280280280
120120120
185185185
280448280
140224140
828282
112179112
TABLE 1. VDP CAPSULE ANCHORS: CHARACTERISTIC VALUES* according to EOTA DESIGN METHOD A Concrete ≥ C20/25
DESIGN DATA
RECOMMENDEDLOAD
TensionNrec kN
ShearVrec kN
777
586
111111
8139
151515
121913
191919
223625
292929
355635
363636
508050
595959
8012880
LOAD REDUCTION FACTORS
scr ccr
hhef
hmin = 1.33*hef
• Characteristic Spacing scr and Edge Distance ccrThe least centre-to-centre and centre-to-edge distances at which the loads listed in Table 1 are applicable. If the spacings and edge distances are less than scr/ccr, the
recommended loads must be adjusted downwards by applying reduction factors. See Tables 2 & 3.
• Minimum Spacing smin and Minimum Edge Distance cminThe absolute minimum anchor centre-to-centre and centre-to-edge distances allowed.
• Group Effect In this drawing, Anchor 4 is the most unfavourably placed anchor in the group because of its proximity to two edges and two other anchors. It attracts
two spacing and two edge reduction factors if the characteristic spacing and characteristic edge distance criteria are not met.
Example: Calculation for Reduced Tensile Load Capacity (RLC)
RLC = Nrec x RFs1 x RFs2 x RFc1 x RFc2 = …kN
Group Capacity. The capacity of a group of anchors shall be the capacity of the most unfavourably placed anchor in the group multiplied by the number of anchors in the group.c1