RHS vs CHS

Sustainable Foundations can now be used to reduce installation and  maintenance costs for sign-posts, grab-rails and bollards  on the WA road network.

Our selection is not based on price alone, also the safety & saving aspects. Sustainable foundations provide a significant cost benefit in replacing the damaged sign post by re-using the existing footing. The Smart Taper allows the quick replacement of posts, with no further effort required to the base and reduces risk to employees by reducing time spent exposed to traffic!”  MRWA

 

CHS POSTS APPROVED FOR ALL REGIONS

CHS posts are now approved for use in all regions. No longer limited to removable sign-posts or cyclone regions. VIEW MRWA APPROVAL

 

  • 60.0 CHS 2.3 can be used instead of RHS 76 x 38 x 2.5
  • 60.0 CHS 2.5 (Grade 450) can be used instead of RHS 75 x 50 x 2.5

 

 SINGLE TRAFFIC SIGN POSTS

≤ 1.00 m² -  60.3 CHS 2.3²

 > 1.00 m²-  60.3 CHS 2.9

 

SUSTAINABLE  FOUNDATIONS APPROVED FOR ALL REGIONS

CHS posts are now approved for use in all regions. No longer limited to removable sign-posts or cyclone regions. VIEW MRWA APPROVAL

 

 

SPECIFICATION SIGNAGE 601 EXTRACT

SIGN SUPPORTS

601.26 GENERAL

1. Sign support dimensions shall be in accordance with Drawing Nos 8720-0657, 0330- 1686, 0330-1687 and 0330-1688 and the post schedules shown on the sign drawings.

2. The gauge of rectangular hollow section (RHS) and circular hollow section (CHS) sign posts for single post signs shall be as specified in Annexure 601D.

3. Circular Hollow Section (CHS) signposts must be secured using an approved fixing device and / or sign mounting bracket as specified in Annexure 601G.

4. Flexible sign posts and / or mounting bases may be used for single post signs vulnerable to impact. Normally, the post, mounting base and sign substrate would be designed to be flexible. Approved fixing devices are specified in Annexure 601G.

 

Flexible Sign Posts are defined as sign posts which deflects when impacted by a vehicle and then returns to a vertical position, without maintenance intervention. Flexible sign posts may only be used for the installation of signs that are mounted near the nose of a traffic island. The height from the ground to the top of the sign shall not exceed 1.2m. This application may typically be applied to the following signs:

 

a) R2-3(L or R) Keep Left/Keep Right

b) R2-5 (No U-Turn)

c) R2-15 (U-Turn Permitted)

d) MR-GT-15 (L or R) Cars Only

e) MR-HM-12 (Divisional Marker) or D4-2-2 (Bidirectional Hazard Marker)

The types of flexible posts and bases used shall be as specified in Annexure 601G.

 

5. Removable Sign Posts are defined as sign posts which enables the posts to be removed and reinstated from their base with specially designed tools or a lock and key arrangement without damaging either the base or post, Removable sign posts shall be used, where specified, for all removable signs on High-Wide Load corridor routes. A PVC casing arrangement and footing details for a removable sign post located in a concrete or paved area is shown in Drawing No. 9548-0106.

 

Removable sign posts may also be used in locations where signs are frequently hit and the removable post design enables the post to be replaced using the existing footing. Alternative types of removable sign posts used shall be as specified in Annexure 601G.

 

 

 


Why CHS are substantially safer

 

 

 

   

 

 

Why CHS are substantially more cost effective than RHS

 

 

 

Reduce the cost of installing infrastructure

Instead of taking weeks to dig up newly laid foundations to install infrastructure on new works, the infrastructure for an entire development can be installed in a single day.

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Reduce the cost of maintaining infrastructure

Instead of digging up and replacing foundations over and over again, foundations stay in tact and items are replaced in seconds

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Improve safety and effectiveness

Reduce risks and substantially improve the ability to maintain infrastructure within limited budgets and time constraints. 

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Sustainable foundations provide a significant cost benefit in replacing the damaged sign post by re-using the existing footing. Our selection is not based on price alone, also the safety & saving aspects. The Smart Taper allows the quick replacement of posts, with no further effort required to the base and reduces risk to employees by reducing time spent exposed to traffic!” MRWA

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