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Shorter lead times. Custom Civil Products.
Manufacturing Plants in QLD, NSW & VIC.
Shorter lead times. Custom Civil Products.
Manufacturing Plants in QLD, NSW & VIC.
Shorter lead times. Custom Civil Products.
Manufacturing Plants in QLD, NSW & VIC.
Shorter lead times. Custom Civil Products.
Manufacturing Plants in QLD, NSW & VIC.
Shorter lead times. Custom Civil Products.
Manufacturing Plants in QLD, NSW & VIC.
Shorter lead times. Custom Civil Products.
Manufacturing Plants in QLD, NSW & VIC.
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QLD Main Roads

Rectangular Main Roads Pits & Lids

As well as the T60 & T100 pit ranges, Tri Underground are a manufacturer and supplier of the P1, N1/3, P4 and P8 type pits to suit the Main Roads network. These are all Main Roads approved pits that meet MRTS91 and are made to suit SD1631. The relevant TRI Tuff Type 4 and Galvanised Steel Lids options are manufactured to suit SD1632, SD1633 and SD1634. Type 7 pits, lids and infill lids to suit are available upon request.

See below our product tables for further information about these pits & lids

Pit dimensions

Pit Type 

A 

B 

C 

D 

E 

F 

G 

H 

*P1 

516 

232 

408 

410 

125 

425 

140 

350 

N1/3 

585 

315 

520 

445 

210 

450 

225 

470 

P4 

700 

400 

820 

550 

240 

580 

275 

765 

P8 

1370 

550 

895 

1185 

440 

1250 

430 

850 

P1-P9 Lid / Cover Data

There are a variety of pit covers designed to meet different networks including, QLD TMR, NBN, Telstra & Energy Queensland. See below table for our commonly supplied lids options. Other styles such as infill lids, lockable and pad-lockable lids are available upon request

Lid Type

Length

Width

Depth

Weight

Lid Options

P1*

473mm

193mm

40mm

8kg

Elec & Comms

N1/3

498mm

270mm

50mm

17kg

Elec & Comms

P4

651mm

346mm

50mm

26kg

Elec & Comms

P8

651mm

499mm

50mm

30kg

Elec & Comms 

Steel Antislip Lids (QLD TMR approved

These Class B steel lids are coated with a special insulated, anti-slip grey paint. They can be used in a variety of networks and are certified to meet QLD TMR standards.

TRI TUFF Lids (QLD TMR approved)

Tri Underground is the exclusive manufacturer and supplier of the Tri Tuff Class B Composite Cover. This Australian-made cover is widely used through Queensland for both Main Roads & Councils as it’s lightweight and made from a non-conductive, slip resistant composite material. This is beneficial as no insulated coating is required to make this lid safe & non-conductive.