Anchors in civil engineering works

Anchors for civil engineering applications are discussed

1. ANCHORING IN CIVIL ENGINEERING WORKS Dr K M Soni , ADG( Retd .), CPWD, New Delhi

2. CIVIL ENGINEERING WORKS CONSTRUCTION MAINTENANCE REPAIR AND REHABILITATION SEISMIC RETROFITTING ANCHORING TECHNIQUES CAN BE USED IN ALL SUCH WORKS

3. CONSTRUCTION ANCHORING IS REQUIRED TO JOIN A COMPONENT OR MEMBER TO EXISTING MEMBER. NORMALLY, IT IS DONE BY BREAKING THE SUBSTRATE OR EXISTING SURFACE, PUT SOME CONCRETE AND STEEL MEMBER IN CASE, SUCH ARRANGEMENT HAS BEEN FORGOTTEN , IT IS BROKEN AND REDONE IN SUCH CASE, ANCHORING TECHNIQUE CAN BE USED, AND ANCHORS FIXED

4. ANCHORING BASE OR SUBSTRATE SHOULD HAVE SUFFICIENT STRENGTH TO TAKE LOADS ANCHORING CAN BE DONE IN HARD CONCRETE, LOOSE CONCRETE, STONE MASONRY AND BRICK MASONRY ANCHORS ARE AVAILABLE HEAVING HIGH AND LOW STRENGTH AS PER REQUIREMENTS ANCHORING MAY REQUIRE BASE PLATES, ADHESIVES AS PER SITE REQUIREMENTS NOW, MANY COMPANIES PROVIDE ANCHORS AND TECHNICAL GUIDANCE

5. FIXING GRILLS OR FENCING WITH ANGLES ON BOUNDARY WALL CONSTRUCT THE BOUNDARY WALL LEAVE THE BRICKWORK/STONEWORK AT PLACES WHERE GRILLS OR FRAMES OF SUPPORTS OF FENCING ARE TO BE FIXED ELSE BREAK THE BRICKWORK OR STONEWORK ANCHORING DONE THROUGH MS ANGLES BY EMBEDDING IT IN CONCRETE CONCRETE IS NOT PROPERLY CURED RESULTING IN LOW STRENGTH AND POOR QUALITY PLASTERING IS NOT PROPER AS SHUTTERING OF CONCRETING IS NOT PROPER

6. FIXING GRILLS OR FENCING WITH ANGLES ON BOUNDARY WALL COMPLETE BOUNDARY WALL FIRST AND THEN FIX GRILLS OR ANGLES WITHOUT DAMAGING OR BREAKING BRICKWORK/STONEWORK THROUGH ANCHORING

7. FIXING OF CANOPIES

8. FIXING OF CANOPIES ON EXISTING COLUMNS/WALLS

9. VERTICAL EXTENSION OF BUILDINGS SUPPOSE NO DOWEL BARS HAVE BEEN LEFT FOR VERTICAL EXTENSION SUPPOSE SOME CONNECTIVITY IS REQUIRED WITH EXISTING STRUCTURE, USE ANCHORING TECHNIQUES WITHOUT DAMAGING EXISTING CONCRETE

10. ANCHOR BOLTS SUPPOSE YOU FORGOT TO CAST ANCHOR BOLTS IN FOUNDATION OR BEAM FOR BASE PLATE FIXING, USE ANCHORING TECHNIQUE

11. REPAIR AND MAINTENANCE WORKS IN CASE OF REPAIR AND MAINTENANCE WHERE ANCHORING IS REQUIRED, ANCHORS CAN BE EASILY USED WITHOUT BREAKING OF SUBSTRATE SUPPOSE A PIPE IS TO BE EMBEDDED ON WALL WITHOUT BREAKING, ANCHORING CAN BE RESORTED

12. REHABILITATION IN REHABILITATION WORKS WHERE EXTRA REINFORCEMENT IS TO BE ADDED IN THE FORM OF WIRE FABRIC/MESH, IT CAN BE ANCHORED TO EXISTING STRUCTURAL MEMBERS

13. SEISMIC RETROFITTING IN CASE OF SEISMIC RETROFITTING OF BRICK MASONRY STRUCTURES, ANCHORING CAN BE APPLIED

14. TYPES OF ANCHORS MECHANICAL ANCHORS CHEMICAL OR ADHESIVE OR RESIN ANCHORS

15. PRINCIPLES OF ANCHORING FRICTION KEYING BONDING COMBINATION OF ABOVE MECHANICAL ANCHORS WORK ON THE PRINCIPLE OF FRICTION AND KEYING CHEMICAL ANCHORS WORK ON THE PRINCIPLE OF BONDING

16. MECHANICAL ANCHORS EXPANSION ANCHORS TORQUE EXPANDING ANCHORS DISPLACEMENT CONTROLLED ANCHORS NON EXPANSION ANCHORS UNDERCUT ANCHORS SELF TAPPING SCREW ANCHORS

17. https://blackz.fr/en/3302-mechanical-anchors

18. http://www.jsce.or.jp/committee/concrete/e/newsletter/newsletter37/index_files/271/271.html

19. https://en.sormat.com/ https://slideplayer.com/slide/10395177/

20. APPLICATIONS Mechanical anchoring system can be used for various applications for high to medium and light loadings. These are suitable for heavy loadings in steel construction, and dynamic loading from RCC columns and machines. For such loads, heavy duty anchors are used which are suitable for non cracked and cracked concrete both. They have high loading capacity and force controlled expansion, and there is no rotation in hole when bolt is tightened.

21. MECHANICAL ANCHORS Medium and light duty anchors are used in facades, curtain walls, ceilings, angles, tracks, channels, metallic sections, brackets, columns, air ducts, suspended ceilings, electric installations etc. in RCC. Insulation fasteners are used for insulating materials in concrete, bricks, and hollow brickwork.

22. MECHANICAL ANCHORS For light load applications, various anchors like frame anchors, impact anchors, cavity anchors, hook anchors, wedge anchors etc are also manufactured

23. CHEMICAL ANCHORS Chemical anchors are suitable for cracked and un-cracked concrete, brickwork, block work, light weight concrete work, stone work etc. Thus chemical anchors can be used in most civil engineering applications except for very heavy loading requirements.

24. https://www.hobson.com.au/page/conxtruct/chemical-anchor-conxtruct.php

25. CHEMICAL ANCHORS Chemical Anchors are non expansion type fasteners that used in pre-drilled holes. Fixing of the anchor is achieved by inserting a suitable curing resin into the hole. Anchor can be loaded once curing time has been reached. They have good load capability, good resistant to vibration, able to complete sealing of hole, can be installed close to edge and has excellent holding power in weak base materials Chemical anchoring is used in applications that requires a light, medium or heavy-duty anchor for fixing into concrete, brick or block base materials. They can be used in holding down fixtures such as machinery, pumps, motors, fabrication and suspension work, railing, stairs, balconies, etc .

26. ANCHORING IF YOU WANT ANYTHING TO BE HANGED ON ANY SURFACE WEAK OR STRONG, PROVIDED SURFACE IS ABLE TO TAKE STRUCTURAL LOAD, USE ANCHORING TECHNIQUES LET US SWITCH OVER TO FINISHED WORK AND THEN USE ANCHORING TECHNIQUE FOR FIXING ARRANGEMENTS

27. Thanks for attending Dr K M Soni , ADG ( Retd .), CPWD, New Delhi Also available on Youtube : KRISHNA MURARI Soni at https://www.youtube.com/channel/UC_pPYxk0jI1ayqA5rO6fBOw