To: All Installation Suppliers / Central Office Operations
Representatives / Design Engineering Representatives / Quality
Representatives / Corporate Real Estate Representatives
Date: Wednesday, September 10, 2003
From: QWEST Installation Quality Assurance
Subject: Proper Procedures for Floor Anchor Installation and
Floor Anchor Hole Repair. Changes to TABLE A.
Action Required :
YES:  NO:
Description of Bulletin:
The purpose of this Bulletin is to provide all Qwest-approved installation Service Suppliers with the correct information regarding the proper floor anchor installation and floor hole repair procedures defined by the Qwest Corporate Real Estate organization for Qwest central office locations.
If there are any doubts about the quality or condition of the concrete flooring prior to, or during equipment removal or installation, Qwest Corporate Real Estate Design Construction or Property
Management should be consulted. New holes are normally drilled with floor tile in place but it is necessary to inspect the concrete for excessive surface and subsurface cracking as new anchors are installed. New holes should be drilled with a uniform diameter throughout the embedded anchor depth.
To assure the performance of new anchors, it is important to properly fill and repair old anchor holes with an approved filler material. This minimizes crack propagation and preserves the strength of the concrete where future anchors may be needed.
Service Supplier inquiries regarding floor anchor placement should be directed to Qwest
Technical Publication 77350 Issue M, Par. 3.21 - 3.23. Upon completion of the removal of equipment bays or other items anchored to the floor, the Service Supplier shall repair the vacated floor anchor holes in accordance with the procedures listed within this Bulletin.

Specific questions regarding floor hole repair or floor tile repair should be directed to the Qwest
Real Estate Work Environment Center (referrals will be made to the respective Real Estate
Project Management local office) at 1-800-201-7033.
Acknowledgments to Howard Cooper, CRE Senior Project Analyst, for his contribution to the technical content of this Bulletin via his source text, “Concrete Floor Post – Installed Anchor
Installation and Repair” dated Nov. 25, 2002.
Qwest Installation Quality Assurance
Jeff Bostow
612-798-2460 mailto: jbostow@qwest.com
METHODS & PROCEDURES FOR INSTALLING CONCRETE EXPANSION ANCHOR
2-1/2 INCH EMBEDMENT
Concrete Floor Drilling and Anchor Installation Procedure:
1.
Drill using 18-mm diameter masonry diamond drill to an embedment depth of 60-mm
(2-1/2 inches).
2.
Clean hole using a High Efficiency Particulate Arrestor (HEPA) vacuum to remove loose debris.
3.
Inspect the hole for uniform diameter top to bottom.
4.
If hole diameter is uniform, then install the anchor per Hilti Product Technical Guide
2002, Instructions for Heavy Duty Sleeve Anchor 4.3.2.4
. Refer also to Table
A.
5.
If hole diameter is not uniform, drill out a larger hole centered over the old hole using a minimum 44-mm (1-1/2 inches) diameter masonry diamond drill to a minimum embedment depth of 60-mm (2-1/2 inches).
6.
Clean hole using a High Efficiency Particulate Arrestor (HEPA) vacuum to remove loose debris.
7.
Wet surfaces and fill the hole flush with rapid setting high strength anchoring cement
(Quikrete 1245 or equal, with final set time 10 to 30 minutes per ASTM C191) and allow to set for 24 hours.
8.
Drill out a new 18-mm diameter hole and repeat this process starting at step 1 above.
REUSING EXISTING ANCHOR LOCATIONS:
NOTE: It is preferred to use a new anchor location if possible.
1.
Centered over the existing anchor location using a core drill with a minimum 44-mm (1-
1/2 inches) diameter, cut the new diameter to a minimum depth of 60-mm (2-1/2 inches).
2.
Inside the core carefully cut, break out, chip, and remove concrete debris and the old anchor insert.
2

3.
Clean hole using a High Efficiency Particulate Arrestor (HEPA) vacuum to remove loose debris.
4.
Wet surfaces and fill the hole flush with rapid setting high strength anchoring cement
(Quikrete 1245 or equal, with final set time 10 to 30 minutes per ASTM C191) and allow to set for 24 hours.
5.
Drill out a new 18-mm diameter hole centered on the new anchoring cement and install the new anchor using the above.
Concrete Floor Drilling and Anchor Installation Procedure
FILLING AND REPAIRING ANCHOR HOLES
1.
Remove stud bolt, or if necessary cut, grind flush with floor using HEPA vacuum.
2.
Fill the hole flush with rapid setting high strength anchoring cement (Quikrete 1245 or equal, with final set time 10 to 30 minutes per ASTM C191).
3.
Do not cover with tile.
MATERIAL SPECIFICATION FOR ANCHOR HOLE REPAIR
When removing equipment frames and repairing anchor holes use a designated “Repair Mortar” formulated for high strength to make structural repairs to concrete and masonry surfaces.
Quikrete 1245 or equal, with a final set time 10 to 30 minutes, is approved by Qwest CRE for this application. The mortar must be designated for concrete repair. To later locate repaired holes, do not cover with floor tile.
APPLYING MORTAR
The repair mortar should be applied to a damp surface. Pour the mortar and fill anchor hole.
After initial set, finish flush with exiting floor. Final set time is about 40 minutes. Do not cover with tile.
ADDITIONAL ITEMS WITH RESPECT TO ANCHOR HOLE REPAIR
NOTE: If floor tile repair work is also required as a result of floor tile damage due to equipment removal, the Service Supplier will not attempt to repair or replace the damaged tile(s). The Service Supplier is instructed to contact Qwest Corporate Real Estate Property
Management through the Work Environment Center (WEC) at 1-800-201-7033.
The Service Supplier should use this same contact number above in the event that the subsequent equipment removal has created a “structural issue” with the floor integrity.
3

HILTI TELECOMMUNICATIONS ANCHOR SPECIFICATION FOR QWEST LNS
HLSB M 12/12.7 *60 – Used for battery stands (only) in DC Power Rooms
HLSG M 12/0 *60 – Used in Toll Rooms and DC Power Equipment
APPLICATION
ZON
E
HILTI
P/N
SIZE
BIT EMBEDMENT MIN BASE
DIA DEPTH THICK.
TELECOMMUNICATIONS
ANCHORS
ALLOW.
LOADS
HSLB M 12/12.7 *60
Concrete
Compressive Strength
HSLG M 12/0 *60
Torque Cap version for High Seismic
Risk Zones 2b thru 4 with up to ½ inch fastening thickness.
Stud anchor for High Seismic applications in shallow embedment
Torque nut shears off at 60 ft-lbs leaving
2b,3 97413007 12mm 18mm
4
2b,3
4
230712 12mm 18 mm
60 mm
2 1/2"
60 mm
2 1/2"
100 mm
4"
100 mm
4"
Tensile
2740 lbs
1965 lbs
Shear
5040 lbs
3330 lbs.
(3000 psi)
Tensile
2335 lbs
1965 lbs red seal for quality assurance and Shear installation integrity. 2375 lbs
Concrete
Compressive Strength
2 -2X2 " washers 2680 lbs.
(3000 psi)
Note: This information is available from Hilti only on request and is not part of the Hilti product catalog. Anchor performance specifications are not available on Hilti letter head documentation.