Original source · versioned page text
Stormwater Management Report
Attached to the e-mail Response to Information Request - MCU18/0120, RAL18/0013, OPW18/0197.
Original PDF page 18, section 1. The text section number identifies this passage in the reader.
NOTES:
NOTES:
1.0 GENERAL:
120.67
190mm blocks BACKFILL DRAINAGE SYSTEMS
1.1 Existing surface levels are indicated thus:
It is essential that steps be taken to prevent the backfill behind the wall from
1.2 Finished constructed levels are indicated thus: 120.00 becoming saturated. These steps should include:-
Pavement (a) Sealing backfill surface-this can be done by covering it with a compacted
1.3 All building floor levels to be confirmed and approved
by the Architectural Designer prior to construction. layer of material of low permeability. The surface should be sloped towards
190mm blocks an open drain.
1.4 Contractor to obtain all necessary permits. (b) A drainage system within backfill-this should preferably be achieved by placing gravel to a
1.5 Underground services are shown where known. Contractor width of approx 300mm immediatly behind the wall with a cointinuous agricultural pipe
is to determine the exact location and depth of all located at the base of the wall. The outlets to the pipe must be beyond the ends of the wall
Pavement unless the pipe is connected to a proper storm water drainage system. For higher walls,
services prior to commencing any excavation. or in cases where excessive ground water exists it may be necessary to provide another
Optional Capping Fence to builders
1.6 When applicable, all carparks are to be whitelined with block details agricultural pipe drain at mid height of the wall.
100mm wide painted lines using approved linemarking If it is not possible to discharge the drains beyond the end of the wall, weep-holes may be
Longitudinal reinforcement:
paint. N12 in alternate courses
provided (see notes on construction below). In this case, a collecting system (eg. spoon
commencing from top course.
drains) must discharge the water into a drainage system tp prevent saturation of the ground in
1.7 Carry out all concrete work in accordance with AS3600.
Height of 190mm blocks
Omit on top of clean-out block
front of the wall.
1.8 Verify all setting out dimensions prior to construction. WATER PENETRATION
Vertical reinforcement: N12
1.9 Do not obtain dimensions by scaling the structural elements. N12-400
at 400mm crs in 190mm If considered necessary to reduce the passage of water through the wall to a negligible quantity, for
1.10 IF DOUBT EXISTS, REFER TO ENGINEER. wide block section. lap 450 aesthetic or other reasons such as aggressive ground water, the earth face of the wall should be treated
using appropiate sealing techniques such as water-resistant render, water-resistant coating, or tanking with
Longitudinal reinforcement: 55mm cover bituminous materials.
2.0 DESIGN LOADS: N12 in alternate courses DIMENSIONS AND REINFORCEMENT
commencing from top course. CONSTRUCTION
600 min lap
2.1 Heavy Vehicle Loading - 16 Tonne axle load.
H = 2200 to 3400
55mm 'H' 'L' 'A' bars 'B' bars 'C' bars
Omit on top of clean-out block
Additional AG Pipe.
Cover 600 600 N12 N12 N12 Blocklaying procedure follows that of the normal practice for building unreinforced walls.
Recommendations specifically applicable to reinforced masonry retaining walls follow:
3.0 CONCRETE: 800 800 N12 N12 N12
B bars-400 1. Cleanout openings should be provided in the bottom course, to permit removal of mortar fins and
'H'
3.1 Place the following concrete (adjust target strength to 1000 1000 N12 N12 N12
other debris, and to allow positioning and tying of vertical reinforcement. These openings must be
H = 1400 to 2000
provide F'c as defined in AS3600) :- 55mm cover 1200 1100 N12 N12 N12 closed before grouting. The stems of wall can be built before the base is poured, as in swimming
Vertical reinforcement: pool construction. In this case the clean out block is in the depth of the slab and is closed by the
Location F'c at 28 days as defined in AS3600 N12 at 400mm crs 1400 1200 N12 N12 N12 concrete of the base.
K Bars
Driveway 32 MPa 1600 1300 N12 N12 N12 2. Above the first course, the use of 15.48, 20.48 and 30.48 H-blocks is recommended because they
290mm Blocks Longitudinal reinforcement: 'A' bars-400, 1800 1400 N12 N12 N12 are easier to fill with grout and provide required protection of the reinforcement. 15.42 and 20.42
Height of 290mm blocks
Crossover 32 MPa 55mm cover N16 at 400mm crs in 600 lap with blocks may be used in lieu of H-blocks and these blocks require less grout for filling. However, they
290mm wide block section. 'B' bars. Reinforcment bars at 400mm crs UNO must be laid with alternate courses inverted so as to provide grout cover to longitudinal
Max. Aggregate Size: 20mm reinforcement, which must be lifted 20mm clear of the web of the block by using stirrups or other
supports.
Slump: 80mm V Bars V Bars
3. Weepholes can be formed by leaving out mortar in the vetical joint at the required location.
600 min lap
50 Cover
Cure all concrete surfaces as directed in the specification. Clean out Where H-Blocks are used and a weephole is required, it is necessary to use 15.42, 20.42 or
Cleanout Block Cleanout Block Course
3.2 Sample and test concrete in accordance with AS3600. C bars-400 30.925 blocks on either side of the required weephole location so that a mortar free joint may
Continuous AG Pipe Continuous AG Pipe be formed as described.
3.3 Consolidate by vibration. connected to stormwater X Bars connected to stormwater X Bars Brushed on sika primer 1 or
system surrounded by free system surrounded by free Open cell polyurethane equivalent 1-8 hrs prior to inserting 4. Reinforcement must be positioned accurately and tied securely before placing concrete or
250
draining gravel. draining gravel. foam backing rod sikaflex pro sealant or equivalent. grout. Vertical reinforcing bars, including starter bars, should be as close to the back of the wall
4.0 REINFORCEMENT: as possible, consistent with cover requirements.
450
4.1 Fix reinforcement as shown on the drawings. The type and 5. Mortar fins protuding into cores should be removed before
250
N12-300crs grouting.
300
grade is indicated by a symbol as shown below. On the
400
drawings this is followed by a numeral wich indicates the 6. It is recommended that whenever available, ready-mixed grout to workability specifications given
550
diameter of the bar in millimetres. in AS3700 1988 should be used. Site-mixed grout, if used, should be mixed thoroughly in a
N16 at 400 250 tilting drum type paddle mixer to the same specification as ready-mixed grout.
Hot rolled deformed bar: N N16 at 400
'L' 7. All cores should be filled with grout, whether reinforced of not. This is essential, to bond and
Structural grade plain round bar: R protect horizontal reinforcement and to give maximum weight for stability.
12
Hard drawn wire fabric: No. R16 dowels x 400 long.
300 Grease and cap one end.
8. The grout should be compacted thoroughly so that voids are not left. Compaction may be by
4.2 All laps in reinforcing steel to be full tension laps unless rodding with a plain round bar (do not use main vertical reinforcing bars ot other deformed bars)
B
noted otherwise. or with a high frequency pencil vibrator, used carefully.
4.3 Proifile bar supports or spacers to give the following
330
B
TYPICAL RETAINING WALL RT2 SECTION BOND BEAM CONTROL JOINT 9. Construction joints are to be used @ 6m centres in long run of
concrete cover to all reinforcement, unless noted SCALE 1:20 AT A1 SCALE 1:20 AT A1 walls.
otherwise on the drawings.
Slabs: 40mm Top & Side.
Walls Height 0.8-2.0m high
5.0 GENERAL DRIVEWAY SLAB ON GROUND NOTES: BASE WIDTH REINFORCMENT
WALL Walls 2.2-3.4m high
'B'
5.1 Subgrade Preparation: HEIGHT
SURFACE SLOPE X-Bars V-Bars
(a) Trim foundation material to required levels and `H` LEVEL 1 in 4 BASE WIDTH REINFORCMENT
WALL HEIGHT OF
remove any soil containing organic material. 800 800 1000 N12 at 400 N12 at 400 'B'
HEIGHT 290mm wide
SURFACE SLOPE X-Bars V-Bars K-Bars
1000 1000 1200 N12 at 400 N12 at 400 BLOCKS
(b) Proof roll to reveal any soft spots. All soft spots `H` LEVEL 1 in 4
1200 1100 1500 N12 at 400 N12 at 400
to be removed and replaced with a material 2200 1900 2800 800 N16 at 400 N16 at 400 N16 at 400
1400 1300 1700 N12 at 400 N12 at 400
having a minimum CBR 15 and compacted 1600 1400 2000 N16 at 400 N16 at 400
2400 2000 3100 800 N16 at 400 N16 at 400 N16 at 400
to 98% standard A.A.S.H.O. 1800 1600 2200 N16 at 400 N16 at 400
2600 2200 3300 1000 N20 at 400 N20 at 400 N20 at 400
2800 2400 3600 1000 N20 at 400 N20 at 400 N20 at 200
5.2 Refer Architect for setout. 2000 1700 2500 N16 at 200 N16 at 200 N12 bars at 400mm crs.
3000 2600 3900 1000 N16 at 200 N16 at 200 N16 at 200 Horizontally & vertically
Note 5 kPa is equivalent to support residential driveway N16 top course only
5.3 Pour slab on waterproof membrane. 3200 2800 4200 1200 N20 at 200 N20 at 200 N16 at 200
Reinforcment bars at 400mm crs UNO Surface to discharge clear
3400 2900 4500 1400 N20 at 200 N20 at 200 N16 at 200
5.4 Filling as required to bring the site to grade shall be of retaining wall
Note 5 kPa is equivalent to support residential driveway
CBR 15 material compacted to 98% standard A.A.S.H.O. Reinforcment bars at 400mm crs UNO
in layers of 150mm maximum. The builder shall take
compaction tests to verify the degree of compaction Free draining granular
600mm max
and provide the certificates to the Engineer. TYPICAL RETAINING WALL RT1 SECTIONS backfill
Wall sealant to suit architectural Pavement
5.5 Certification of the quality of the CBR 15 material shall SCALE 1:20 AT A1
requirements and finishes
be provided to the Engineer for approval prior to 190mm Block Wall All
55mm cover
delivery to the site. cores filled with 20MPa
grout
5.6 Construction joints shall be located at sawn or dowel
joints. If located at sawn joint substitute dowel joint
detail.
R6 ligs at 900mm crs for
600mm min
trench mesh spacing
An equivalent cage option
may be substituted for steel
REAL PROPERTY BOUNDARIES ARE TO BE ESTABLISHED BY specified
A LICENCED SURVEYOR. THE CONTRACTOR SHALL CONFIRM
TO THE SUPERVISING ENGINEER THAT THIS HAS BEEN Lap TM a min 500mm or 1
COMPLETED TO SUCH A STANDARD THAT WILL PERMIT full panel at ends of runs
Use 50mm min cover
WORKS TO BE SET OUT ACCURATELY. THE ENGINEER SHALL
300mm min
BE GIVEN THE OPPORTUNITY TO CONFIRM SUCH SETOUT
BEFORE CONSTRUCTION COMMENCES. Footing Steel
3-L11TM top
& bottom
TYPICAL RETAINING WALL RT3 SECTION
SCALE 1:20 AT A1
N12 trimmer bars
50mm side cover.
500 typ
500 typ
Typical.
Slab joint
1500 1500
N12 trimmer bars
50mm side cover.
Kerb Invert Typical.
Saw Joint 25 deep See the original
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