Retrofit Trench Repair

Composite Engineering’s new Retrofit Trench Repair system has been developed as a cost

effective replacement solution for areas of concrete trench wall damage, as well as curved,

dented and corroded steel trench covers. Trench wall failure caused by concrete reinforcement

corrosion issues can be easily solved without the need for concrete pours, moving existing

trench contents and cabling, or the need for any additional earthing on site. Installation in

damaged areas requires minimal tools, equipment and personnel, with materials light enough

to be carried into site by the installers. The system can be installed in short sections during

ongoing maintenance for minimal disruption to site operations, and has been designed to

improve efficiency and working methods when installing and inspecting cable trench systems.

Why Composite Engineering Retrofit Trench?

Reduction of equipment on site

Minimal site staff required for installation

Electrically and thermally non-conductive

Excellent chemical and corrosion resistance

Unmatched impact resistance

High strength to weight ratio

Material contains active fire retardants

Maintenance free service life

Drop Lids into place

Ready for immediate use

Trim Lids (if required)

Fit Trench Profile

Characteristics Units Test Reference

Tensile Strength 220Mpa ASTM D1037-93

Modulus of Elasticity 21Gpa ASTM D1037-93

Flexural Strength 280Mpa ASTM D1037-93

Compressive Strength 145Mpa ASTM D1037-93

Arc Resistance (LW) 120 Seconds ASTM D495

Dielectric Strength (LW) 1.58kV/mm ASTM D149

Dielectric Strength (CW) 7.9kV/mm ASTM D149

Dielectric Constant (PF) 5.2 @ 60Hz ASTM D149

Anti-slip Surface R13 AS4663:2004

Retrofit Trench Repair

Benefits of Composite Engineering Retrofit Trench

Reduction of installation time (no formwork or concrete pouring)

Reduction in specialist equipment and tooling on site

No copper required for earthing—material saving

No steel required for reinforcing—eliminates corrosion issues

No specialist concrete coring required for trench penetrations

QA reduction on site

Total site supervision greatly reduced

Solid Top Grating Lids

Composite Engineering’s new Retrofit Trench Repair

system use the lightest, yet strongest lid available

on the market today. Our grating lids are fully

customisable to any width or configuration, and can

be trimmed and modified on-site, without the need

for any hot work permits, or specialised cutting

equipment. Composite Engineering Trench Lids are

light enough to qualify as single-man lifts, satisfying

strict OH&S requirements.

Composite Engineering’s Solid Top Grating lids feature the same

bi-directional load bars as our superior moulded grating, as well

as a gritted top surface that exceeds the Australian Standard’s

requirements for slip resistance (AS4663-2004). Available in

standard colours of Light grey and safety yellow, CE Solid Top

Grating provides the light weight, super-tough material to re-

place aging steel lids across all industries. Load tables for our

most common thickness (41mm) are attached for reference.

Co

mp

osi

te E

ngi

ne

erin

g C

ove

red

Gra

tin

g 3

8m

m x

38

mm

x 3

8m

m, w

ith

3m

m g

ritt

ed

to

p

Po

int

load

, sp

an=3

50m

m

Load

(kg

s)

100

2

00

300

4

00

5

00

60

0

70

0

80

0

90

0

10

00

Defl

ection

0.2mm

0.4mm

0.6mm

0.9mm

1.0mm

1.1mm

1.3mm

1.4mm

1.6mm

1.7mm

Load

(kg

s)

110

0

120

0

130

0

14

00

1

50

0 1

60

0

17

00

1

80

0

19

00

2

00

0

Defl

ection

1.9mm

2.1mm

2.3mm

2.7mm

2.7mm

2.9mm

3.2mm

3.5mm

3.7mm

3.9mm

Load

(kg

s)

210

0

220

0

230

0

24

00

2

60

0 2

80

0

30

00

3

50

0

41

00

4

50

0(d

amag

e)

Defl

ection

4.1mm

4.3mm

4.5mm

4.7mm

4.9mm

5.2mm

5.5mm

6mm

6.5mm

7mm

Lin

e lo

ad, s

pan

=350

mm

Load

(kg

s)

100

2

00

300

4

00

5

00

60

0

70

0

80

0

90

0

10

00

Defl

ection

0.2mm

0.4mm

0.6mm

0.8mm

1.0mm

1.2mm

1.5mm

1.6mm

1.8mm

2.0mm

Load

(kg

s)

110

0

120

0

130

0

14

00

1

50

0 1

60

0

17

00

1

80

0

19

00

2

00

0

Defl

ection

2.1mm

2.3mm

2.4mm

2.6mm

2.9mm

3.2mm

3.5mm

3.8mm

4.1mm

4.4mm

Load

(kg

s)

240

0

270

0

300

0

35

00

4

00

0 4

50

0

50

00

6

00

0

70

00

8

00

0(d

amag

e)

Defl

ection

4.9mm

5.3mm

5.7mm

6.3mm

7.5mm

9mm

11mm

14mm

17mm

20mm

Po

int

Load

, sp

an=5

00m

m

Load

(kg

s)

100

2

00

300

4

00

5

00

60

0

70

0

80

0

90

0

10

00

Defl

ection

0.3mm

0.6mm

0.9mm

1.0mm

1.5mm

2.0mm

2.5mm

3.0mm

3.4mm

3.8mm

Load

(kg

s)

110

0

120

0

130

0

14

00

1

50

0 1

60

0

17

00

1

80

0

19

00

2

00

0

Defl

ection

4.1mm

4.4mm

4.6mm

4.8mm

5.0mm

5.4mm

5.7mm

6.0mm

6.3mm

6.6mm

Load

(kg

s)

21

00

2

20

0

23

00

2

40

0

27

00

30

00

3

50

0

40

00

4

50

0

48

00

(dam

age

)

Defl

ection

7.0mm

7.4mm

7.8mm

8.2mm

8.7mm

10mm

11mm

12.2mm

14mm

16mm

Lin

e Lo

ad, s

pan

=500

mm

Load

(kg

s)

100

2

00

300

4

00

5

00

60

0

70

0

80

0

90

0

10

00

Defl

ection

0.2mm

0.4mm

0.6mm

0.9mm

1.2mm

1.5mm

1.7mm

1.9mm

2mm

2.3mm

Load

(kg

s)

110

0

120

0

130

0

14

00

1

50

0 1

60

0

17

00

1

80

0

19

00

2

00

0

Defl

ection

2.6mm

2.8mm

3.1mm

3.5mm

3.8mm

4.3mm

4.6mm

4.9mm

5.1mm

5.5mm

Load

(kg

s)

210

0

240

0

270

0

30

00

3

50

0 4

00

0

45

00

5

00

0

55

00

6

00

0(d

amag

e)

Defl

ection

5.8mm

6.5mm

7.5mm

8mm

10mm

12mm

14mm

16mm

18mm

20mm