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NO C2203/1G NOTES: CIVIL ENGINEERING AND CONCRETE BUTTRESS TYPE A THE ENGINEER IS TO PROVIDE THE FOLLOWING INFORMATION:
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39638_3C2203B.pdf SCALE DRAWING NO.DATE
DIAGRAMMATICJAN 1991
AOriginal Signed
FORMER DRG. NO. C2203/1G.
NOTES:
CIVIL ENGINEERING AND
DEVELOPMENT DEPARTMENT
REF. REVISION SIGNATURE DATETYPICAL DETAILS OFCONCRETE BUTTRESS
TYPE A
C2203B
03.2015
1. ALL DIMENSIONS ARE IN MILLIMETRES. 2. THE ENGINEER IS TO PROVIDE THE FOLLOWING INFORMATION: i ) DIMENSIONS, SURFACE INCLINATION OR OUTLINE OF BUTTRESS ON ROCK FACE; ii) CONCRETE SURFACE FINISH REQUIREMENT e.g. COLOUR AND PATTERN; iii) DOWEL REQUIREMENT; iv) THE EXTENT OF THE RELIEF DRAIN AND WEEPHOLE; & v) OTHER FACING REQUIREMENT e.g. MASONRY FACING. 3. FOR SMOOTH SURFACE FINISH, A GROOVE SHALL BE FORMED FROM THE RELIEF DRAIN PIPE TO LEAD THE WATER DOWN TO THE BOTTOM OF THE BUTTRESS. GROOVE TO BE CO-ORDINATED WITH ANY SURFACE PATTERN. 4. MINIMISE PROTRUDING SURFACES, SO THAT SURFACE OF BUTTRESS IS AS FLUSH WITH SURROUNDING ROCK FACES AS POSSIBLE. 5. BUTTRESS SHALL BE FOUNDED ON GRADE III OR BETTER ROCK, OTHERWISE ENGINEER SHALL MAKE ANY NECESSARY CHANGES TO SUIT SITE CONDITIONS.6. FOR BUTTRESS FOUNDED ON MATERIALS OTHER THAN GRADE III OR BETTER ROCK, ENGINEER SHALL INCLUDE PROVISION TO MITIGATE POSSIBLE EROSION OF THE FOUNDING MATERIALS, e.g. ADEQUATE EMBEDMENT OR NO-FINES CONCRETE APRON AT THE TOE OF BUTTRESS. 7. GENERAL DETAILS OF DOWEL ARE SHOWN ON THIS DRAWING. ENGINEER SHALL MAKE ANY NECESSARY CHANGES TO SUIT SITE CONDITIONS.07.2019
BNOTE 6 ADDED
Original Signed
ROCK FACE
FALL 1 : 50
FALL200 MIN.1 0001 500
30^
GROUND ORBERM LEVEL
GRADE 20 / 20 CONCRETE OR 20 MPa SPRAYED CONCRETE INCLINED FACE SHALLMATCH THE SLOPE FACE ANGLE50 DIA. HALF-ROUNDGROOVERELIEF DRAIN( SEE STD. DRG. NO. C2404 )
SURFACE FINISH TO CONCRETEA252 MESH WITH 100 COVERPOTENTIAL SEEPAGE PLANE
50 DIA. PVC PIPE(SEE STD. DRG. NO. C2404)
L-SHAPED HOT DIP GALVANIZEDDOWELS AS SPECIFIED AT1 500 c / c MAX. IN BOTH DIRECTIONSDOWEL DIAMETER PLUS 20 MIN.
DOWEL DIAMETER PLUS 20 MIN.
3001 500 500
HOT DIP GALVANIZED DOWELSAS SPECIFIED AT 1 500 c / c MAX.