Principal Repair Methods for Wood

8/13/2019 Principal Repair Methods for Wood

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Principal Repair Methods currently used on in-situ repair/restoration

1. Modified Flitch and upgrade of Beams (TYPE A)

2. Compression and Tension zone Upgrading (TYPE B)

3. Improving Effective Span: Depth Ratio (TYPE C)

4. Tension Compression Zone Upgrading -- Top Access only (TYPE D)

5. Upgrading Glulam Beams (TYPE E)

6. Beam End Repair

7. Modified Tenon

8. King Post Truss

9. Repair/Restoration of Wall Plates

10. Repair to Beams or Joints Above Decorative Ceilings

11. Bonded-in Dowel Joints

12. Bonded-in Plate Joints


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rotafix1. Modif ied Flitch and Upgrade of Beam (Type A)

Use Mafell mortiser or electric chainsaw min. 1600 WATT to cut slot

1STAGE 2 3


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Break out timber with chisel and vacuum

21 3STAGE


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Set in correct number of rods with min. 10 mm spacers

Check for fissures and seal on exterior face

Calculate volume mix and pour structural epoxy grout TG6Allow for de-aeration and top up as necessary

3 NEXT METHOD >>1 2STAGE


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rotafix2. Modif ied Flitch and Upgrade of Beam (Type B)

(Compression and Tension Zone Upgrading)

Cut slot(s) or chase(s) with router straight flute cutter on shaped cutter.

Vacuum slot(s) or chase(s)

1 2 3STAGE


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rotafix2. Modif ied Flitch and Upgrade of Beam (Type B)

(Compression and Tension Zone Upgrading)

Inject slot or chase with pre-calculated volume of thixotropic adhesive.

21 3STAGE


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Insert C.F.R.P. plate(s)/slot(s) or rod(s)/chase(s)

Remove excess adhesive

2. Modif ied Flitch and Upgrade of Beam (Type B)(Compression and Tension Zone Upgrading)

31 2 NEXT METHOD >>STAGE


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rotafix3. Modif ied Flitch and Upgrade of Beam (Type C)

(Improving Effective Span: Depth Ratio)

Cut out slots to correct depth with chain mortiser or chainsaw.

Vacuum clean all chases.

Check for fissures and if necessary seal with TM3 mortar.

1 2 3STAGE


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Inject pre-calculated amount of thixotropic adhesive CB10TSS into the blind chases.

21 3STAGE


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Push F.R.P. or metallic plates into the adhesive using spacers where necessary.



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4. Modif ied Flitch and Upgrade of Beam (Type D)(Tension Compression Zone UpgradingTop Access only)

2 3 4 5 61STAGE


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2 3 4 51 6STAGE


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2 3 41 5 6STAGE


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2 3 41 5 6STAGE


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2 51 3 4 6STAGE


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2 3 61 4 5 NEXT METHOD >>STAGE


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5. Modif ied Flitch and Upgrade of Beam (Type E)(Upgrading Glulam Beams)

Measure and drill holes from the under side at 30 from horizontal

NB it is essential to use a guide jig.

1 2 3STAGE


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Inject pre-calculated amount of thixotropic adhesive CB10TSS into the blind holes

21 3STAGE


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Install pre-cut rods into the resin filled holes.

Remove excess adhesive.

Cosmetically finish with wooden plugs or textured wood mortar TM3.



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6. Beam End Repair

Mark our position of holes with template

Drill holes correct diameter and length

1 2 3STAGE


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6. Beam End Repair

Install calculated volume of thixotropic adhesive Timberset, or CB10TSS,

or CB10T to rear of drilled hole using extension tube.

31 2STAGE


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6. Beam End Repair

Rotate/push rods into adhesive, check holes are 100% full.

Leave to cure.

Remove supports.



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rotafix7. Modif ied Tenon

Mark out position with template

Cut slot with drill stitching technique or chain mortiser

Vacuum slots

Cut and dry fit plate -- Remove

1 2 3 4STAGE


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Inject calculated volume of thixotropic adhesive

3 41 2STAGE


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Fix plate one side

41 2 3STAGE


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Fix second component and support joint

Leave to cure

41 2 3 NEXT METHOD >>STAGE


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rotafix 8. King Post Truss

Prop int position

Drill holes through both components

2 31STAGE


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rotafix8. King Post Truss

Inject to back(rear) of composite hole

the pre-calculate volume of thixotropic adhesive

31 2STAGE


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rotafix8. King Post Truss

Insert and centralise pultruded rods

Seal extension holes according to cosmetic requirements



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rotafix9. Repair/Restoration of Wall Plates

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Cut out slots to correct depth with chain mortiser or chainsaw.

Vacuum clean all chases.

Check for fissures and if necessary seal with TM3 mortar.

STAGE


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Inject pre-calculated amount of thixotropic adhesive CB10TSS into the blind chases.

21 3STAGE


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Push F.R.P. or metallic plates into the adhesive using spacers where necessary.

Clean the excessive adhesive from surface.



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Soft board support ceiling.

1 2 3STAGE


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21 3STAGE


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11. Bonded-in dowel Joints

1 2 3 4STAGE


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3 41 2STAGE


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41 2 3STAGE


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41 2 3 NEXT METHOD >>STAGE


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1 2 3 4 5STAGE


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3 41 52STAGE


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41 2 53STAGE

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41 2 3 5STAGE

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2 31 54STAGE-THE END-

Principal Repair Methods for Wood

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