Anchor engineer

 

Reinforcement with steel plate when usages of building change or more structure strength need

Research on steel plates reinforcement of RC beams
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§Steel plates─epoxy reinforcement method

1.Figures of beam reinforcement




B-B


A-A

Installations

Clear out part brushed
Strike cement separated, then clear out part brushed
Repair honeycomb with cement for reinforcement (AE130ABC)
Inject AE160 into cracks
Fix steel plates on beams, SS41 steel for beams, full welded
Droll holes and install chemical anchor (M12)
Seal all gap (including sides of chemical anchor and steel plates)
Inject with AE140 until air-vent overflow

 

Usage advice about chemical anchor:

When height of beams h≧40cm or thickness of steel plates t≧12mm, use AEG M16
When height of beams h<40cm or thickness of steel plates t<12mm, use AEG M12
When length of short side of column b≧30cm or thickness of steel plates t≧12mm, use AEG M16
When length of short side of column b<30cm or thickness of steel plates t<12mm, use AEG M16
   
Interlace anchor with 40cm distance up and down

 

2.Figures of column reinforcement

         
            A-A

Installations

Clear out part brushed

Strike cement separated, then clear out part brushed

Repair honeycomb with cement for reinforcement (AE130ABC)

Inject AE160 into cracks

Fix steel plates on column, SS41 steel for column, full welded

Droll holes and install chemical anchor (M16)

Seal all gaps (including sides of chemical anchor and steel plates)

Inject with AE140 until air-vent overflow

Preface

RC construction must be reinforced to make it safe when they become danger because of fire, damage of material and load alter etc. Methods of reinforcement include altering construction system and reinforcing strength of construction component, such as beams and columns.

 

On altering construction system, methods of adding walls, declining shore, and columns alter load system as a whole. Thus, construction system load is shared to make old construction reinforced.

 

On reinforcing strength of construction component, reinforcement of steel plates (or FRP etc.) is a method in common use. Commonly, altering construction system is a economical, effectual method if the method don't change function of old construction. However, the method can generally damage function of old construction. Thus, the method is difficult to use effectually.

 

The method, reinforcing strength of construction component, is not economical, but it is a popular method when we consider benefit as a whole (function is more important than reinforcement cost).

 

The reinforcement method of construction component includes steel plates (or FRP) reinforcement and enlarging section and bar of members. When we use the method of enlarging section and bar of members, we should consider the ways of operation of interface between new and old concrete and bar's joint and fixation. The effect of operation can be evaluated by current RC theory. So, we can gain our ends for construction reinforcement.
However, enlarging section of members will reduce active space. It is difficult to accept the method because it is so expensive to buy a block of land or house in modern city. Thus, the method of steel plates (or FRP) reinforcement is more popular than that.

 

When we reinforce RC construction with steel plates, we should affix steel plates on two sides of beams with epoxy resin and anchor them at appropriate point with bolts to form sandwich beams. The bend theory of the sandwich beams display that the method of affixing steel plates on two sides of beams can reinforce moment and shear of old RC beams.

 

According to theory above and experimental result, this paper present a simple and effectual design table and design method to be adopted by construction engineers when they make some designs for reinforcement of RC beams.

 

Reinforcement of profiled bar
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Reinforcement with H-profiled steel when usages of building change or more structure strength need.


§ Steps on adding H-profiled bar to reinforce

 

Install chemical anchors correctly on two sides of RC beams
Side-plate and connection-plate in term of figure above, machine them in factory as a whole and carry them to spot of operation
Install Side-plate and connection-plate at appropriate place
Install H-profiled bar, fix them and connection-plate together with high tension bolts (H.T.B)
Fill up the gaps between the top of steel beams and RC plates with epoxy resin
Fill up the gaps between side-plate and RC beams with epoxy resin
Brush steel beams with red lead paint to protect them from rusting

 

 

Add small beams to reinforce
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Installations
  1. Install chemical anchors rightly on two sides of RC beams.
  2. Side-plate and connection-plate in term of figure above, machine them in factory as a whole and carry them to spot of operation.
  3. Install Side-plate and connection-plate at appropriate place.
  4. Install H-profiled bar, fix them and connection-plate together with high tension bolts (H.T.B).
  5. Fill up the gaps between the top of steel beams and RC plates with epoxy resin.
  6. Fill up the gaps between side-plate and RC beams with epoxy resin.
  7. Brush steel beams with red lead paint to protect them from rusting.
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