Bridge - Garden Bridge.pdf - Projekty - stolarstwo - juan1p

Garden Bridge

INSTRUCTIONS - MATERIALS - COSTS

In this page

• The Plan

• Making the template for the arch

• Making the laminated arch beam

• Making the laminated handrail arch

• Cutting the laminated arch boards

• making the sides

• The bridge frame

• The decking and handrail

• The finish

• Notes and tips

• The material list and cost

The only timbers used in this project are 90x19 h3 premium pine decking and 90x32

h3 standard pine decking. Both timbers and readily available at most timber

merchants. For a detailed list of timber and hardware required, scroll to the bottom

of the page.

The Plan

(a) Shoe

(d) Handrail uprights

(b) Arch beam

(e) Handrail arch frame

(f) Handrail capping board

click to enlarge

Making the template for the arch

To make the arch template, 3 stakes will need to be firmly

hammered into the ground and braced oppossing the

bending force.(see picture). Space the stakes as per the

dimensions shown in the accompanying picture.

The arch beams the are made by bending and glueing and

screwing four lengths of 90x18 h3 pine decking together.

When the glue is dry (the next day) this newly made

laminated arch beam can be cut down the middle

(lengthwise) to create two arch beams for the base of the

bridge. (See section "cutting the arch boards") The arch

handrail is made the same way, using the same template.

click to enlarge

Making the laminated arch beam

Bend a piece of 90x19 knot free decking board, 2400mm

long, between the arch template pegs. Bend a second

board against the first puting a generous amount of glue

between the two boards. Repeat this action until four

boards are in place forming the arch.

Clamp the boards together and also screw along the arch

approx every 300mm with 50mm stainless steel screws on

both sides.

Ensure the screws are not put along the centre line of the

arch beam as this line is to be cut.

click to enlarge

Making the laminated handrail arch

Use the same template for the handrail arch as the beam

arch (see picture).

Make the laminated handrail arch (on top of the beam arch

which is still lying in place until glue has dried) in the same

way as the laminated arch beam, but use only two

90x19x2700 boards and not four.

Be careful not to glue the handrail arch to the beam arch.

click to enlarge

Cutting the laminated arch boards

Using a power saw, cut the laminated arch boards in half,

along the length of both the beam and the handrail (see

picture). This will give you two laminated arch beams

approx 80x45x2400 and two laminated handrail frames

approx 40x45x2700.

Trim the arch beams to the dimensions shown see diagram

below

click to enlarge

Making the sides

Cut a length of 90x32x2400 standard pine decking in half

(lengthwise) and make 8 handrail uptights at 45x32x600.

Bolt the handrail uprights to the arch beams so that 4

uprights are spread evenly along each arch beam and so

that each upright is at right angles to the arch beam. Make

a timber washer and glue to the inside of the arch beam

(see picture).

Drill and nail the handrail arch frames on top of the

uprights. Secure each end with metal strap plates.

click to enlarge

The bridge frame

Cut 3 spreaders 90x32x540 and fix between the side

frames, one in betweem the middle of the arch beams and

one near each end. Secure with metal strap brace. (see

picture).

Nail 3 temporary spacers on top of the handrail arch frame

to keep parallel until the decking boards have been nailed

on. Nail and glue the shoes (90x19x625) to the underside

of the arch beams, one at each end.

Nail a temporary brace from shoe to shoe until the decking

boards have been nailed on.

click to enlarge

The decking and handrail

Nail the decking boards 90x32x680 onto the arch beams

with 90mm flathead galvanised nails. Begin at each end

and work towards the middle. The final piece will have to

be cut to fit and the deck boards will need to be checked

(cut) around the handrail uprights.

Trim the ends of the handrail arch frames (at right angles to

the end of the arch beam) and bend fix two handrail

capping boards (90x19x3000) to the top of the handrail

arch frames. Secure with glue and m10 coach bolts and

washers, 4 each side. Countersink the head of the bolts

into the capping board.

click to enlarge

Eazy az. The finished bridge.

click to enlarge

Notes and tips.

The 90x19 boards used for making the arches must be premium and knot free. If

there are any deformities in the boards, then they will snap when bending pressure

is applied.

The glue used in this project was sturdi bond. This glue was used because of ease

and because the arche boards were also screwed to each other. As a stand alone

glue (ie without the screws), a more substantial exterior glue would be preferred.

Materials and cost

NOTE: These prices are indicative only.

MATERIAL

DESCRIPTION

AMOUNT

COST

90x32 radiata decking

handrail uprights - 4 @ 600

decking - 25 @ 680

spreaders - 3 @ 540

22m @ $3.20 p/m $70.40

90x19 radiata decking (knot free)

arch beam - 4 @ 2400

handrail arch frame - 2 @ 2700

handrail capping - 2 @ 3000

shoe - 2 @ 625

23 @ $2.40 ea $55.20

Hardware

M10 coachbolts - 8@75mm 8@120mm

50mm stainless steel screws - 50 of

tubes sturdi bond glue - 2 of

metal strap 400x30 - 8 of

75mm galvanised flathead nails - 2kg

$75.00

TOTAL MATERIAL COST INCLUDING GST $200.60

Bridge - Garden Bridge.pdf

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