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Projects Concrete blocks for getting more lift

Discussion in 'The Hokey Ass Message Board' started by rladams65, Sep 26, 2021.

  1. 6sally6
    Joined: Feb 16, 2014
    Posts: 1,684

    6sally6
    Member

    I guess working under a car/truck with just a bumper jack is still a no-no!

    (I have spent many hours under there back in the 60's when I was full-of-come-and-bullet-proof!)...I did chock the wheels most of the time!

    Cinder blocks still a bad idea!
    6sally6
     
  2. Roger Loupias
    Joined: Jun 24, 2021
    Posts: 120

    Roger Loupias

    I have a pair of 12X16" end cut wood header beams, cut them from a house tear down. Stay safe.
     
    olscrounger and Rickybop like this.
  3. ken bogren
    Joined: Jul 6, 2010
    Posts: 931

    ken bogren
    ALLIANCE MEMBER

    I'm leary of any riser that is taller than the base is wide/long.
     
    b-body-bob and Squablow like this.
  4. manyolcars
    Joined: Mar 30, 2001
    Posts: 8,510

    manyolcars

    I stack two wheels on each side of the car with a good 4x4 running across under, Thats in addition to my regular jack stands
     
    Rolleiflex, VANDENPLAS and Rickybop like this.
  5. Truckedup
    Joined: Jul 25, 2006
    Posts: 4,207

    Truckedup
    Member

    I was in construction most of my life and never an actual cinder block other than very old buildings...
     
    Last edited: Sep 27, 2021
  6. Jackstands yes. Blocks never.
    FB_IMG_1627215360103.jpg
     
  7. GTS225
    Joined: Jul 2, 2006
    Posts: 1,199

    GTS225
    Member

    You know what would be great? If somebody (ahem!) happened to have full-size patterns available to offer up.

    Just sayin'.....Roger
     
    VANDENPLAS, Blue One and Just Gary like this.
  8. Truck64
    Joined: Oct 18, 2015
    Posts: 5,080

    Truck64
    Member
    from Ioway

    IMG_1716.JPG

    Good to go? Not so good?
     
  9. Boneyard51
    Joined: Dec 10, 2017
    Posts: 5,173

    Boneyard51
    Member

    Always use something safe, like me! B836DF36-5284-41CA-BDEB-AB66D9CFC855.jpeg






    Bones
     
  10. Budget36
    Joined: Nov 29, 2014
    Posts: 7,222

    Budget36
    Member

    @Boneyard51

    You’ll be fine Bones, just put a little gravel around the center support on the left that fell over;)
     
  11. Boneyard51
    Joined: Dec 10, 2017
    Posts: 5,173

    Boneyard51
    Member

    Wow! Ok! I hadn’t noticed that! Thanks, I don’t want to get myself killed!:)







    Bones
     
  12. BrerHair
    Joined: Jan 30, 2007
    Posts: 4,730

    BrerHair
    ALLIANCE MEMBER

  13. Oh great! Now my house is gonna fall! Damned ol concrete blocks! Hey @Boneyard51 , you got any drawings of how ya built that? I'm thinking i ain't gonna have to bend over to paint rocker panels anymore! :D
     
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  14. squirrel
    Joined: Sep 23, 2004
    Posts: 49,795

    squirrel
    Member

    If you were to put the blocks in a mortar bed, then put a mortar bed on top of them, and set the stands in the mortar bed, then the blocks would probably work fine.

    It's all about concentrated loads. Blocks can't withstand them. Houses don't make them. So blocks work fine to hold up houses, but not cars.
     
  15. Stan Back
    Joined: Mar 9, 2007
    Posts: 1,175

    Stan Back
    Member
    from California

    IMG_1716.JPG
    No problem! - If it fails you just roll off to safety.
     
  16. ramblin dan
    Joined: Apr 16, 2018
    Posts: 2,647

    ramblin dan

    That picture reminds me of when I was in Mexico about 5 years ago and walked passed a vacant lot with old carnival rides and old trucks with the wheels off and pulleys hooked to rear end to power the rides.
     
    Boneyard51 likes this.
  17. Uh.... i was joking squirrel ;) i was truly surprised that this conversation is still rolling on!
     
    Boneyard51, 57 Fargo and squirrel like this.
  18. squirrel
    Joined: Sep 23, 2004
    Posts: 49,795

    squirrel
    Member

    I figured you were, but it was also time to offer some explanation, in case someone didn't get your joke
     
  19. Country Joe
    Joined: Jan 16, 2018
    Posts: 338

    Country Joe
    Member

  20. Since we're on the subject, in the fire service we use plastic cribbing, made from recycled plastic. Good shit, and it has a diamond pattern molded into it so the blocks interlock with each other. But for years we used wooden blocks. Even for our step cribbing. But, with both materials, a hole drilled in one end with a rope handle makes them easier to handle, and retrieve from under a car.
     
  21. Guy Patterson
    Joined: Nov 27, 2020
    Posts: 255

    Guy Patterson

    Lloyd I was going to write about composite cribbing but you got to it so thanks.
     
  22. Hi Not to jack this talk but I lost a very good friend when he used concrete blocks to temporary hold a Jeep up. Worked with him for years and a real great guy and friend. He retired moved to Florida and was killed using concrete blocks 6 months later. He knew better to do something like this but as others have said something caused them to crumble! We all do dumb things from time to time but you might not recover from this situation. Thanks
     
    Boneyard51 likes this.
  23. Truckedup
    Joined: Jul 25, 2006
    Posts: 4,207

    Truckedup
    Member

    Nope, a single concrete bock can support about 1500 pounds per square inch......you need to use two heavy wall two core blocks on a solid level surface like concrete or black top. Cores are in a vertical position, no space between the blocks A single board, thick plywood is ok ,board placed on top of blocks covering both blocks. If more height is needed the blocks need to stacked like wood cribbing but no more than two blocks high ...I have seem temporary supports in construction like this supporting the weight of many cars. I am not suggesting to do this but to say blocks cant support the weight is false...
     
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  24. stanlow69
    Joined: Feb 21, 2010
    Posts: 5,731

    stanlow69
    Member
    from red oak

    Some people juggle with knives too, but I`m not gonna do it. I own 5 sets of jack stands and not a single concrete block.
     
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  25. chopped
    Joined: Dec 9, 2004
    Posts: 2,072

    chopped
    Member

    I wonder why mobile homes all over the south don't come crashing down every day.
     
  26. clem
    Joined: Dec 20, 2006
    Posts: 3,457

    clem
    Member


    Maybe CMU are different in the States, but over here :

    Concrete CMU in housing and other construction only have the strength from the reinforcement steel and solid poured concrete inside them.
    The block essentially acts as boxing for the poured concrete inside.

    OP asked about concrete blocks, not CMU or cinder blocks.
    (although I suspect that is what he was probably referring too).

    solid concrete blocks with engineered reinforcing steel and engineered MPA rating will be fine. - if you can lift them into place ………

    let’s see if we can get to 4 pages…….
    .
     
    Last edited: Sep 30, 2021
  27. Budget36
    Joined: Nov 29, 2014
    Posts: 7,222

    Budget36
    Member

    Cement and concrete are not the same thing. Cement is made with concrete.
    Concrete is strong, and if rebar, wire, etc is used, it binds stronger.
    Cement is a heavy duty Plaster of Paris.
     
    Boneyard51 likes this.
  28. Budget36
    Joined: Nov 29, 2014
    Posts: 7,222

    Budget36
    Member

    @clem posted while I was waiting for my service to come back on my phone!

    Good explanation
     
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  29. gimpyshotrods
    Joined: May 20, 2009
    Posts: 18,670

    gimpyshotrods
    ALLIANCE MEMBER

    This was my understanding from engineering school in the US.

    Anecdotally, I have had concrete blocks break into pieces while trying to put them on the cart at the home center, by hand, gently.
     
    clem, Boneyard51, VANDENPLAS and 2 others like this.
  30. Blue One
    Joined: Feb 6, 2010
    Posts: 11,175

    Blue One
    ALLIANCE MEMBER
    from Alberta

    Bottom line is I don’t give a poop if we’re talking cinder blocks or super duper concrete blocks and neither should anyone else here.

    It’s a stupid distinction to bring up in the discussion as is the suggestion that “real” concrete blocks should be okay.

    Truth is that under no circumstances should concrete blocks of any kind be used to support a vehicle that you will be working under.
     

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