06 Structural Shtocrete Specifications

7/28/2019 06 Structural Shtocrete Specifications

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Structural Shotcrete Specifications

By,

Dudley R. (Rusty) Morgan

AMEC Earth & Environmental,

a division of AMEC Americas Limited

and

Larry Totten

Johnson Western Gunite Company

San Leando, California, USA

SHOTCRETE FOR AFRICA CONFERENCE

Misty Hills Conference Centre

South Africa

-


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Subject of Presentation

Review of structural shotcrete specifications

Shotcrete construction of:

In-ground parking structure, Calgary Alberta

Seismic retrofit of heritage masonry structure, Vancouver, British

Columbia

Walls and pilasters in 50 storey hotel, Vancouver, BC Whistler 2010 Olympics Bobsleigh/Luge Track


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In-Ground Parking Structure, Calgary, Alberta

20 m deep soldier pile/timber lagging stressed channels tie-back evacuation

Cloth/bentonite waterproofing membrane system

Reinforced shotcrete perimeter walls


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Calgary Parking Structure

Preconstruction mock-up of

typical structural steel wall


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Shooting preconstruction mock-up


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Finishing pre-construction mock-up


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Core extracted from pre-construction mock-up for core grading to

prequalify shotcrete nozzlman


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Hoarding installed for cold weather shotcreting

Shotcreting continued at ambient temperatures

as low as -30oC


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Structural reinforcing steel erected ready for shooting

Note hoarding enclosure for cold-weather shotcreting


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Start-up of shooting of structural walls using bench-gunning technique


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Bench-gunning second lift

Note blowpipe


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Upper lift finished to line and grade

Flash-shooting lower lift to shooting wires, ready for

cutting, screeding and finishing


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Trimming shotcrete with

cutting rod to shooting

wires


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Finished structural shotcrete wall

Finisher is cleaning top of wall and rebar to accept

cast concrete suspended slab that will rest onstructural shotcrete wall


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Four levels of structural shotcrete walls completed


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Close-up view of four levels of structural shotcrete walls

Column conventional cast-in-place formed concrete

(too heavily reinforced for shotcrete construction)


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Core extracted from shotcrete wall for compressive

strength testing

Note dense quality of shotcrete free of voids or defects


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Structural shotcrete walls approximately 50%

completed

S i i R fi f H i M S


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Seismic Retrofit of Heritage Masonry Structure

Vancouver, BC

Faade of South Building

S i i R t fit f H it M St t


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Vancouver, BC

Faade of North Building



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Vancouver, BC

Pre-construction shooting of mock-up of column/wall

connection, to prequalify shotcrete nozzleman for

project



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Vancouver, BC

Completion of shooting of

pre-construction mock-up of

column/wall connection



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Vancouver, BC

View of back stripped face of mock-up column/wall

connection

Note complete lack of any voids, shadows or other defects



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Vancouver, BC

View of locations of cores

to be extracted for core

grading in pre-constructionmock-up of wall/column

connection



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Vancouver, BC

View of 5 cores extracted at locations of reinforcing

steel from wall/column connection mock-up

All cores were better than Grade 2



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Vancouver, BC

Interior of North building,

gutted and braced

Reinforcing steel installedin exterior walls, pilasters

and columns, ready for

shotcreting



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Vancouver, BC

L-bar anchors grouted into exterior stone masonry

walls



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Vancouver, BC

Double mat of rebar installed on exterior masonrywall, ready for shotcreting



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Vancouver, BC

Nozzlman bench gun shooting 450 mm thick structural

shotcrete wall

Basement shotcrete left in natural shotcrete finish(since basement backfilled)



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Vancouver, BC

Bench gun shooting 1m deep pilaster through 4 layers

of rebar

Note nozzle inserted through first mat of rebar



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Vancouver, BC

View of above-grade perimeter wall being finished to

line and grade

Note shooting wire

Heavily Reinforced Structural Shotcrete Walls and


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Heavily Reinforced Structural Shotcrete Walls and

Pilaster for New 50 Storey Hotel, Vancouver, BC

Preconstruction mock-p of pilaster and wall


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Heavily Reinforced Pilaster Mock-up with Two Sided Form

Note shooting wire


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Shooting Wall Mock-up with Wet-Mix Shotcrete


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Shooting Pilaster Mock-up


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Shooting Pilaster Mock-up

Note use of blow-pipe to control rebound

Use of Pencil Vibrator to Help Consolidate


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p

Shotcrete in Wall Mock-up


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Trimming Shotcrete to Line and Grade with Cutting Rod


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Finishing Shotcrete with Rotary Disc


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Final Finishing of Shotcrete


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Diamond Saw Cutting Wall and Pilaster Mock-ups


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Saw Cut Wall Section

C f S S


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Close-up of Saw-cut Wall Section

S C t Pil t S ti


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Saw-Cut Pilaster Section

Note dense shotcrete

Cl f S C t Pil t S ti


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Close-up of Saw-Cut Pilaster Section

Note excellent shotcrete consolidation around dense

reinforcing steel

C E t t d f Pil t


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Cores Extracted from Pilaster

Note excellent consolidation of shotcrete

Cores E tracted from Wall Section


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Cores Extracted from Wall Section

Note excellent consolidation of shotcrete around dense

reinforcing steel

Whistler 2010 Olympics Bobsleigh/Luge Track


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Whistler 2010 Olympics - Bobsleigh/Luge Track

Installation of Rebar and Cooling Pipes in Track


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Installation of Rebar and Cooling Pipes in Track

Stay Form Expanded Metal Lath


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Stay-Form Expanded Metal Lath

Correct and Incorrect Method of

Encasing Reinforcing Bars with Shotcrete


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Encasing Reinforcing Bars with Shotcrete

Typical Reinforcing and Cooling Pipe Detail


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Typical Reinforcing and Cooling Pipe Detail

Note use of expanded metal lath in first sections of track

Note Use of Diagonal Spacer Bar


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Note Use of Diagonal Spacer Bar

Note Congestion at Cooling Pipe Header


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Note Congestion at Cooling Pipe Header

Track Ready for Shooting


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Track Ready for Shooting

Note use of temporary plastic screed bars

Shotcreted and Finished Section of Track


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Shotcreted and Finished Section of Track

Void and Coarse Aggregate

Trapped Behind Expanded Metal Lath


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Trapped Behind Expanded Metal Lath


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Void at Congested Area of Cooling Pipe Baffle

and Diagonal Spacer Bar, After Hydro-blasting


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g p , y g

Void at Cooling Pipe Spacer Bar After Hydro-blasting


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g p p y g

Construction of Second Mock-up Using Stay-Form


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p g y

Start of Shotcreting Shoot Cove

Between Wall/Floor First


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Shoot Floor Next


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Consolidate Shotcrete in

Cove/Floor with Immersion Vibrator


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Fully Consolidated Shotcrete In Cove/Wall


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Blow out Rebound/Overspray with Blow-pipe


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Shoot First Lift on Wall


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Back Face of Wall


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Note lack of voids behind stay-form


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Header Form Stripped off Still-Fresh Shotcrete


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Finish Coat Applied to Flush with Screed Pipes


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Screeding Shotcrete to Temporary Screed Pipes


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Finishing of Shotcrete After Screed Pipe Removal


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Broom Texture Finish (to aid ice adhesion)


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Newly Finished Shotcrete Surface

being Moist Cured by Misting


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Misting with Water Pressure Sprayer


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Cut-out Section from Second Mock-up


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Note good consolidation

around rebar, cooling

pipes and stay-form

Close-up View of Cut-out from Second Mock-up


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Note good consolidation

of shotcrete

Completed section of Track


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Whistler 2010 Winter Olympics

Bobsleigh/Luge Track Finish Zone


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Bobsleigh/Luge Track


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Inspection of iced track prior to first run by Canadian WorldChampion Bobsledders Pierre Lueders and Justin Kripps




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Canadian bobsledders Pierre Lueders, pilot and Justin Krippspush off their two-man bobsled from a lower start for their first

run down The Whistler Sliding Centre track




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Start of first run on track

Photo Courtesy VANOC/ Photos: David McColm




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First run on track

Photo Courtesy VANOC/ Photos: David McColm




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Air time at finish




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Documents

06 Structural Shtocrete Specifications