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Pier/deck bearer size?

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  1. #1
    Apprentice (new member)
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    Default Pier/deck bearer size?

    I was hoping for a bit of help choosing the bearer size and how many I require.

    Iíve built a large dam and before i filled it With water I decided at the last minute to orga some holes to build a pier. I know I have spaced the 9 poles too far apart. The deck will be 7 by 7 meters and all the spans are 3500 apart the posts are all 300 by 300 round hardwood posts concreted in.

    My question is can I use 200-75mm hardwood bearers to span the 3500 distance to each of the 9 posts or would I need to put another 2 of the same bearers in to shorten the distance to 1750?

    Photo below is the bearers I was hoping to use but should I add more in?
    Attached Thumbnails Attached Thumbnails d0a0b379-e8ac-4923-90dc-44c9f11bda78.jpg  

  2. #2
    Community Moderator phild01's Avatar
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    Hi JJ, please change your profile location to be more specific, state level as a minimum. It helps for advice (regs, services, products etc).


  3. #3
    Community Moderator phild01's Avatar
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    Quote Originally Posted by JamesJames1248 View Post

    My not sure how to add a photo
    https://www.renovateforum.com/f36/ho...photos-120536/

  4. #4
    Apprentice (new member)
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    ���� Thank you

  5. #5
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    this depends in the F rating of the timber. tables dont tend to go to 3600 spans for bearers, but you may notice that genereally on a bearer span table on a given load width, a doubling of a member moves you 3 spans up, or 900mm.

    on the table I'm looking at for F17 , 200x75 continuous gets you 2700 LW 3600, so will just get you to 3600 span for 3600 LW when doubled - should be able to find one that lists 3600 span somewhere witha bit of googling

  6. #6
    Deactivated User Marc's Avatar
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    2x200x50 unseasoned HW should get you close. Considering that it is unseasoned, the loading capacity will increase as it dries.
    Hope your pylons are double treated to last in water. On the other hand there was no need to have them in concrete. Nothing rots if permanently under water. Only the interphase rots.I suppose in a dam you will not get teredo worms.
    You will need some serious help to lift the beams in position.

    https://www.qbcc.qld.gov.au/sites/de...ecks_final.pdf

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