Cathedral West-Side Closure Proposal The balance will come from - - PowerPoint PPT Presentation

Cathedral West-Side Closure Proposal

to the Anglican Church of Canterbury

Geoffrey Rathbun, Mechanical Engineer 256 Waimairi Road, Ilam, Christchurch

021 052-8050 / 3585-922 / bsed.gr@gmail.com

nd

(2 March, 2015)

Cathedral West-Side Currently

rain & dust enters freely pigeons have free access fast degradation of Cathedral & contents it's unattractive for tourists and citizens some rockfall hazard

Add this Structure

It will cost about $60,000, with $12,000 provided by Geoffrey Rathbun. The balance will come from community fundraising, and hopefully Anglican donations. This is a free-standing structure and does not contact the Cathedral.

to get a Better Situation

greatly reduced weather ingress much reduced pigeon access degradation significantly reduced improved appearance rockfall hazard eliminated locally dismantling of west foyer possible and fence can be closer

Cover Page

1

Installation - 1 - preparatory work TWO

Remove this rubble

ONE

Remove these 2 containers

THREE

Remove these window covers. Smaller covers will be attached later

FOUR

Remove the top three “whalers”

FIVE

Place these 4 concrete blocks in correct positions

The lowest whaler is not removed as it partially supports a large piece of fallen masonry Lightweight support brackets are used to temporarily support each end of a whaler as it is disconnected. A steel lifting loop is also welded to the centre of each whaler Each concrete block weights about 7 tonnes with attachment bracket

the Cathedral from West Side, aerial the steel “Frame” installed to support the West wall

2

Installation - 2 - install side walls ONE install the south wall

First the wall with attached stays is lowered close to the concrete blocks

stays hang freely

The lower ends of the stays are manually pulled sideways and attached to the concrete blocks The wall is then moved down and towards the south wall of the foyer. Once touching the ground, it is fixed there with pins. The wall is now self supporting

TWO install the north wall

First the wall with attached stays is lowered close to the concrete blocks The inner (eastern) stay is manually attached to the taller concrete

• block. This block is specially shaped to fit close to the tower.

The wall is then moved down and towards the north wall of the foyer. Once touching the ground, it is fixed there with pins. The wall is now self supporting Finally, the western stay is fastened to it’s concrete block

3

Installation - 3 - install porch roof

The roof is moved as far to the north as is possible, with the crane cable almost touching the south part of the frame

ONE insert the roof between the upper and lower frame “arms” from the south TWO lower the roof to lie on top of south wall and north

part of lower frame “arm”. It is stable here. Removing lifting hook.

THREE re-attach crane hook to lifting bar

• n the inside of the frame arm and

lift up roof again. A man will be needed on the roof.

FOUR

Move roof north till it is centrally located above the two

• walls. Lower onto walls and

attach to them

4

Installation - 4 - install west wall ONE weld two support arms to the

top of the upper arms of the frame

TWO lift up the west wall, and locate it in-line with and south of

the 1.2m gap between the Cathedral west wall and the frame arms.

The returns are in the “open” position so as to clear the Cathedral during installation

THREE

Move the west wall carefully north. The support lugs pass a little above the attachment arms on the frame. Then,

• nce central to the Cathedral, the wall is moved a little

west and lowered onto the two attachment arms

side view looking North along the gap between cathedral roof and frame

a b

FOUR

Complete attachment of west wall to Frame and Porch Roof

Weld two more attachment arms to the lower parts of the upper frame arms. Then, weld all of these attachment arms to the lugs attached to the west wall Attach the two lower corners of the west wall to the porch roof. Fixation will use an adjustable bracket and wood will be used to take the weight.

5

Installation - 5 - final steps ONE close and lock the roof returns so that

they lie about 50mm away from roof surface

TWO close and lock the side returns

so that they lie about 50mm away from the Cathedral side walls

THREE fit the spouting and two downpipes

to the porch roof. The porch roof takes all the rain runoff

6

Details - North and South Walls

Roofing steel removed for clarity in this view

North and South walls are identical, but opposite hand. The only differing component is the roofing steel which is trimmed with opposite hand The 4 lifting and attachment lugs shown are called up on another sheet Purlins and roofing steel are attached together with standard fittings from Dimond Flashing is used, but is detailed on separate sheet

3 ° 5786 50 10260 100 456

Total Mass kg 1194 Roofing Steel Secon Name Dimond SteelSpan 900 - 0.55 Roofing Steel Area m^2 58.5 Roofing Overall Dimensions m x m 5.79 x 10.26 Angled End Trim ? yes, 3 degrees at one end of all sheets,

• pposite hand for North wall

Roofing Steel Mass kg 313 Purlin Secon Name Dimond DHS-400-1.95 Total Length of Purlins m 80.8 Number of Purlins 1 24 Number of Angled Purlin Cuts 1 10 Total Mass of Purlins kg 869 Wooden Bearers mm x mm 50 x 100 Number x Length mm 16 x 400 Total Mass of Wood kg 12

North and South Walls

7

Details - Porch Roof

Roofing steel removed for clarity in this view

The 2 lifting lugs shown are called up on another sheet Purlins and roofing steel are attached together with standard fittings from Dimond Flashing is detailed on separate sheet

14079 7445 456

Total Mass kg 2130 Roofing Steel Secon Name Dimond SteelSpan 900 - 0.55 Purlin Secon Name Dimond DHS-400-1.95 Roofing Steel Area m^2 105.6 Total Length of Purlins m 146 Roofing Overall Dimensions m x m 14.08 x 7.45 Number of Purlins 1 30 Angled End Trim ? no Number of Angled Purlin Cuts 1 Roofing Steel Mass kg 561 Total Mass of Purlins kg 1569

Porch Roof

8

Details - West Wall

Roofing steel removed for clarity in this view

The 4 attachment and 2 lifting lugs shown are called up on another sheet Purlins and roofing steel are attached together with standard fittings from Dimond Flashing is detailed on separate sheet Returns (Roof and Side) are attached to this wall but are detailed on another sheet

11775 10754 2986 3 7 ° 355 Total Mass kg 1328 Roofing Steel Secon Name Dimond SteelSpan 900 - 0.55 Purlin Secon Name Dimond DHS-300-1.75 Roofing Steel Area m^2 80.8 Total Length of Purlins m 111.9 Roofing Overall Dimensions m x m 11.78 x 10.75 Number of Purlins 1 27 Angled End Trim ? yes, at 37 degrees at one end and north sheets trimmed to opposite hand to south sheets Number of Angled Purlin Cuts 1 14 Roofing Steel Mass kg 431 Total Mass of Purlins kg 897

West Wall (excluding Returns and Flashings)

9

Details - side stays

9172

A A

7000

SECTION A-A SCALE 1 : 4

Configuraon Purlin Profile Weight (kg) Purlins Only Length (m) Quanty Standard Dimond DHS-400-1.95 197 9.17 3 North East for Tower Dimond DHS-400-1.95 150 7 1

Side Stays - Made from Two Purlins Riveted Together

Two sheet metal joiner strips (not shown) hold the twin-purlin together. They run down the full length of each short side of the twin-purlin Standard Stay Each Stay has a welded fitting attached to each end. See separate sheet for details Stay Attachment Weldments are described on separate sheet

10

Details - flashings

Porch Roof - Side Flashing Name and Area Thickness (mm) Weight (kg) Length (m) Folds Special Cuts Quanty Porch Roof Side 0.55 32.15 7.5 4 2 Porch Roof North 0.55 42.1 14.2 2 1 West Wall Side 0.55 9.1 3 4 (includes 2 flat folds) 2 West Wall Top 0.55 29.4 9.74 4 (includes 2 flat folds) two angled end cuts

• ne cutout

2 Returns Roof 0.55 6.5 9,47 3 angled, one right angle 2 Returns Side 0.55 1.65 2.43 3 angled, one right angle 2

Flashings including Returns

West Wall - Side Porch Roof - North West Wall - Top Returns - Side and Roof

11

Details - Profiles and Weldments

Name / Area Mass (kg) Overall Size (mm) Finish Quanty Stay Aachment Bracket 8 400 x 200 x 160 galvanised 8 Whaler Temporary Support Aachment 28 1080 x 600 x 200 plain 2 West Wall Support Arm 40 1300 x 280 x 320 painted 4 Liing Lug for Side Wall 2.9 390 x 50 x 45 galvanised 4 Liing Lug General 1.2 700 x 110 x 16 galvanised 8 West Wall Aachment Lug 1.9 600 x 300 x 12 painted 4 Return Aachment Bracket 0.43 125 x 76 x 50 stainless steel 64

Weldments and Profiles

Stay Attachment Bracket Lifting Lug General Whaler Temporary Support Attachment West Wall Support Arm Lifting Lug for Side Wall West Wall Attachment Lug Return Attachment Bracket

12

Details - Construction and Installation Work

13

Work Step Number Proposal Page # Work Step Descripon Duraon in Days Registered Engineer Days Design Engineer Days Roofing Supervisor Days Skilled Roofer Days Crane & Operator Days Extra Costs Total Cost Esmate $ by Design Engineer Total Cost Esmate $ by Other Body 1 Design Review and Changes 15 0.75 5 1,200 2 Create Safety Plan & gain Approval from Worksafe/CERA 10 5 3 Resource and Building Consents

(indicaons are that neither of these may be needed)

5 - 20 5

about $12,000 required if RC is needed

? 4 2 Cleanup, Frame Preparaon and Measurements

• remove rubble and containers
• remove two window covers
• measure frame dimensions
• measure distances to Cathedral
• remove three whalers
• place 4 concrete stability blocks

1.5 1.5 1.5 1.5 1.5 medium

Bobcat hire for 1/2 day to move rubble to another locaon

3,600 5 Adjust Drawings to suit dimensions gained 5 3 6 7 Build two Side Walls

• includes seng up of build procedure for all wall panels
• uses empty 20 litre paint containers (about 50 in total)

to locate panels above ground

• laser level used to create level surface

3 2 1 2 x 3.0 2,560 7 8 Build Porch Roof 2 2 1 2 x 2.0 1,920 8 9 Build West Wall 3 3 1 2 x 3.0 2,560 9 10 Build 4 Stays

(merge with other jobs)

1 1 X 1.0 320 10 3 Install Side Walls and Stays 2 2 2 2 x 2.0 2.0 medium 5,120 11 4 Install Porch Roof 2 2 2 2 x 2.0 2.0 medium 5,120 12 5 Weld 2 support stays to Frame for West Wall 0.25 0.25 2 x 0.25 0.25 medium 480 13 5 Install West Wall 2 2 2 2 x 2.0 2.0 large 2.0 medium 8,640 14 6 Close Roof and Side Returns and install spoung 1 1 1 2 x 1.0 1 large 3,040 15 Site Cleanup 0.5 0.5 2 x 0.5 320 total $ 34,880 Registered Engineer 200

(excludes possible regulatory costs)

Design Engineer (serviced provided free of charge) Roofing Supervisor 80 3.45 Roofer 40 2 roofers full me Large Crane and Operator 220 1 engineer full me Medium Crane and Operator 160 1 roofing supervisor about 2/3 the me Bobcat Hire 60 cranes about 1/2 the me

Work Steps and Costs

(excluding materials)

total weeks on site Esmated Charging Rates in $ / hour

Final Page

14