Method Statement

for Post-Install Reinforcement

Bar: Drill & Fix with Chemical
Anchor

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 Contents
1. Introduction............................................................................................................................................................................. 4
2. Scope........................................................................................................................................................................................... 4
3. Technical Specification & Reference Details..............................................................................................................6
4. Materials.................................................................................................................................................................................... 7
5. Tools & Equipment............................................................................................................................................................... 7
6. Procedure.................................................................................................................................................................................. 8
5. Coring.......................................................................................................................................................................................... 8
6. Standard Installation Procedure for Post Fixing Rebar........................................................................................9
7. Safety........................................................................................................................................................................................... 9
8. Inspections................................................................................................................................................................................ 9

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1. Introduction
Post-installed reinforcing bar connections are an increasingly important structural
element in repair or upgrading construction and gaining increasing popularity. They are a
reliable and economical means to strengthen or extend existing reinforced concrete
structures with the same performance characteristics comparable to cast-in reinforcing bars
under the assumption that anchoring mortars and reinforcing bars are selected, designed,
and installed by appropriately qualified and experienced personnel.
The connections between existing and new construction are made by installing
deformed reinforcing bars in boreholes drilled using diamond or hammer drilling in the
existing RC structure. The connection between the deformed reinforcing bar and existing
concrete is realized through bonding using a qualified anchoring mortar. Then the new
concrete member is cast. Typical applications include lap splice with existing reinforcement
or anchorage of the reinforcement in a slab, beam or foundation.
To simplify the installation of post-installed reinforcing bar connections and to avoid
improper installations, manufacturers of organic anchoring mortar injection systems provide
product dependent installation kits prepacked in boxes containing all equipment necessary
to clean the borehole and inject the anchoring mortar properly.

Lbd design value of development length, lsd design value of splice length.
(Grey hatch areas represent existing structural component)
Fig 1: Lap splices with existing and post-installed reinforcing bar
2. Scope
This method statement covers the step-by-step procedure and action refer to re-install
existing starter bar for 3rd floor stair 1B zone B2 (SB2 20X50) to be connecting to the 4th
floor beam (B6A 35x70) Zone B2, Grid X14. (As shown fig. 2).
This method statement covers the various requirements to be provided for preparation
like chipping and expose the existing rebar, marking to position the additional starter bar
location, reconnaissance to confirm and ensure that the existing rebar doesn’t get disturbed
and then do core drilling to required depth.
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Fig. 2: 3rd Stair 1B zone B2 Layout plan

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3. Technical Specification & Reference Details
1) Refer to the drawing approved by the consultant, Beam SB2-20x50, which provide main
bar 3DB20 both top and bottom rebar with a 2DB12, Contractor would like to request to
apply this method to comply with the design stated.

2) (SB2-20x50) Starter Rebar to be drill a

Hence
there are
6DB20 &
2DB12
more
shall be drilled to follow approved design drawing. So, use the diameter of the hole to be
24mm for 8 holes and 16mm for 2 holes per various diameter and setting out will carry
out by Engineer.

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3) Hole depth will be a minimum 250 mm. Reference locations of beam starter rebar is
available for consultant review.

Fig. 3: Location and depth detail for SB2 20x50 connecting to B6A 35x70
4. Materials

4.1 Sikadur -31 CF Normal

4.2 Rebar DB16 (as per approved Project specification)

5. Tools & Equipment

Drilling Machine Rotary Machine Hand tools

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6. Procedure

1) Once the location is marked,

clearance will be obtained by the
contractor prior to the
commencement of drilling. The
proper safe workplace is ensured
and prior necessary coordination is
done.
2) Drilling is commenced using for concrete spiral drill bit with carbide head. This will
ensure smooth drilling and penetration into concrete areas but won’t disturb rebar.
3) Wherever the hole making the procedure as narrated above does not work due to
onsite rebar, then the necessary minor shifting of the location is attempted to get
clear of the rebar and normal drilling continued.
4) In such specific cases where normal drilling is stopped due to rebar, further site
reconnaissance is done with available drawings to ascertain the reason for
obstruction. The assistance of the coring machine will be utilized to help clear some
mirror some minor rebar, after join inspection by contractors and site supervisors.

Drilling Hole Clean Hole

Curing using Sika 31CF Rebar Fixing
7. Coring
Prior to coring, confirm power connection to the machine are in order. Start 24Ø
and 14Ø core drilling to minimal depth to clear the obstacle. Once the specific
obstacle like the edge of rebar, etc is cleared, then the coring machine is withdrawn

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and the area

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cleaned. Further normal drilling activity reinstated to continue drilling holes to the
required depth.
8. Standard Installation Procedure for Post Fixing Rebar
Attached to this submittal is a detailed method statement
to be submitted by using Sika -31CF Normal.

9. Safety
9.1 Work Permits should be obtained prior to starting
Work.
9.2 Check proper power supply phase and extension cable
condition prior to starting.
9.3 Close supervision by the contractor is required during
the entire operation.
9.4 Only experienced and skilled labor shall be engaged
for the job.
9.5 The people involved in the construction work
shall wear PPE such as safety helmets, safety shoes,
gloves safety glass, mask etc. as required.
9.6 Site supervisor/ engineer & Safety officer shall check
and ensure that all safety precautions are followed. After fixing

9.7 Manual handling procedures must be

followed.
9.8 Site engineers/ foreman must ensure that the work is carrying out safely.
9.9 Any incident or near miss incident shall be reported
immediately to the concerned safety officer.
10. Inspections
1) Rebar setting out and marking.
2) The hole depth and cleaning using a brush and air blower or water.
Contractor to submit for consultant inspection and approval.
3) Rebar fixing/application of the chemical.
4) Curing