Real Challenges for Civil Engineers No.04
Client requirement Introduce new floors to existing
buildingEngineering challenge Enlarge the column footing of
existing building to
carry new loadsConventional Methods
Option 1 Provide necessary supports to the beams and break the
existing footing
Provide new reinforcement to the footing and concrete
Problems Encountered
1. Breaking of concrete footing is more risky
2. Other structures may affect due to vibration while concrete
breaking
3. More time taken to complete the task
4. Additional supports to be provided for the existing beams for
few days
5. High cost incurred at the end of the job
Option 2Provide new footing on top of existing footing while
providing starter bars through columnProblems Encountered1.
Insufficient footing depth2. Service lines may obstruct at new
footing level3. More time taken to complete the task
4. High cost incurred at the end of the job
New Method introduced by the HILTI with the development of
Technology
Drill holes to the existing concrete footing and fix
reinforcement with HILTI RE 500 bonding agent
Method statement
1. Consult your structural Engineer for the design of new
footing size and new reinforcement sizes ( check the existing
reinforcement sizes too)
2. Call HILTI Engineer to get instruction for reinforcement
fixing
3. Drill holes to specified diameter and depth
4. Clean holes with blow out pump provided
5. Insert HILTI RE 500 chemical with the use of dispenser
provided ( No hand mixing)
6. Insert the reinforcement bars and keep 8 hrs to cure
7. Arrange reinforcement as usual and form work too
8. Provide some shear connectors on top of footing with HILTI RE
500 or
HILTI HY 150
9. Roughen the concrete surface and apply any bonding agent if
necessary and do the concreting as usual
Advantages1. No concrete breaking is required
2. No additional support needed to support existing concrete
3. No vibration and hence no chance to develop cracks
4. Maximum 2 days to complete the total task
5. Easy for concreting
6. Low cost ( less than Rs.200/- to fix Y12 bar at nominal
embedment depth )
7. Application is so simple and no chance for mistakes
8. No risk for the job
9. Pullout test will be done by HILTI Engineers before
concreting to ensure the strength
10. All technical support will be given by HILTI Engineers
Technical Assistance Neelanga Sooriyarachchi
B.Sc. Eng (Hons);MBA; AMIE(SL)
Engineering Service Manager
Mob 0717712968 Email . [email protected]
T.D.Wijitha Kumara
B.Sc.Eng(Hons);CEng;MIE(SL);MSSE(SL);MBA
Technical Manager
Mob. 0717772815 Email. [email protected]
Office
207, Nawala Road, Nugegoda
Te. 0114713352, 0114542320
Fax. 0114723208
Email. [email protected] Sales Engineers / Sales
ExecutivesChandima Samarasinghe Colombo Area
B.Sc. Eng ( Hons)
Te. 0717579369
Lalith Chaminda Colombo Area
B.Sc. Eng ( Elec)
Te. 0718540846
Nadun Ranatunga Colombo Area
Sales Executive
Te. 0713733107
Sampath Bandara Kurunegala, Kandy, Anuradapura, Batticaloa
Sales Executive
Te. 0713733106
Tuwan Burah Southern, UvaSales Executive
Te. 0717124687
Product of
Hilti Engineering DivisionNew Reinforcement fix with HILTI RE
500
Shear Connectors fix with HILTI HY 150
New footing
Existing footing
Column Footing Strengthening
