#5 Rebar With 33" Lap Splice In 8" Block - Masonry - Contractor Talk

#5 Rebar With 33" Lap Splice In 8" Block

 
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Old 04-01-2010, 12:01 PM   #1
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#5 Rebar With 33" Lap Splice In 8" Block


I have a job where the engineer is asking for a 33" lap splice for the rebar in the cores we grout. Now that means the piece of rebar is going to be 66" which is pretty high to be lifting block. They are allowing me to do pours in 12' lifts and my supplier said that he might be able to get some block where there's a knockout so you can insert a clip when you drop the rod in. Has anybody ever used those and and did it work good?
Also if anyone has any better ideas feel free to tell me.
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Old 04-01-2010, 12:13 PM   #2
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Re: #5 Rebar With 33" Lap Splice In 8" Block


Never heard of such a thing.

Good luck and thank God they are not 12"s

D.

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Old 04-01-2010, 06:01 PM   #3
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Re: #5 Rebar With 33" Lap Splice In 8" Block


They're called rebar positioners and they work well enough to keep the rebar where it is supposed to be. Make sure the blocks with the end webb cut out are set up before you pour or they will blow out. I envy you, we never get to pour a twelve foot lift.
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Old 04-01-2010, 06:55 PM   #4
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Re: #5 Rebar With 33" Lap Splice In 8" Block


They specd them for the last job I did. They ended up being more of a pain in the then they were worth in my opinion. I would double check with the engineer on the splice. As far as I know 30" is normal. 5' isn't a bad lift for 8s.
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Old 04-01-2010, 09:08 PM   #5
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Re: #5 Rebar With 33" Lap Splice In 8" Block


Lifting 8's over the rods won't be that bad. If you really don't want to do it buy factory made one holers.
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Old 04-03-2010, 08:30 AM   #6
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Re: #5 Rebar With 33" Lap Splice In 8" Block


Thanks for the response guys. Masonlifer we may go 12' but we need to use a cable vibrater. Brickie what is a factory one holer? Would we possibly have a different name for them here? This is my first commercial job of this kind and has a lot of specs that are little new to me. Its only 1600 block so hopefully I won't lose my a$$ to bad and gain some valuable experiance for the future.
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Old 04-03-2010, 09:02 AM   #7
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Re: #5 Rebar With 33" Lap Splice In 8" Block


8x16x8 KODL/conduit block or one of these:
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Old 04-03-2010, 10:49 AM   #8
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Re: #5 Rebar With 33" Lap Splice In 8" Block


There are many different block shapes available in many thicknesses. - A "double H" with a two open ends (half cores) and a large center core is another one since the webs all align perfectly.

Some people are in areas with limited availability of special shapes from suppliers to help contractors. Normally, a mis-guided engineer will go with a wall too thick and build out of the "knuckle busting" double flush end units and limit productivity.
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Old 04-03-2010, 11:15 AM   #9
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Re: #5 Rebar With 33" Lap Splice In 8" Block


The first block in Tscar's post is a one holer. They can be cut on site or ordered from the factory that way. Like Dick said not all areas have factory one holers though. A two holer is the end web cut out, like the one holer, with the the center web cut out also. These block are very common in commercial work.




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There are many different block shapes available in many thicknesses. - A "double H" with a two open ends (half cores) and a large center core is another one since the webs all align perfectly.

Some people are in areas with limited availability of special shapes from suppliers to help contractors. Normally, a mis-guided engineer will go with a wall too thick and build out of the "knuckle busting" double flush end units and limit productivity.

Target stores almost always spec "knuckle busters".
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Old 04-04-2010, 05:19 PM   #10
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Re: #5 Rebar With 33" Lap Splice In 8" Block


Concretemasonry I do tend to agree wiyh you a lot of engineers don't do their homework when it comes to block walls.
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Old 07-11-2011, 11:11 AM   #11
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Re: #5 Rebar With 33" Lap Splice In 8" Block


To avoid long laps i have used LENTON couplers to replace them.
These have proven to be a time and money saver and i have used thousands of them. It saves the cost of using the more expensive open cell blocks. In addition, i no longer have to lift block over the rebars, which my guys love. It really opens the cell up and allows for better consolidation and better integrity of the overall wall.
Take a look at this website for additional information
http://www.erico.com/products/C130WB06.asp
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Old 07-11-2011, 11:30 AM   #12
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Re: #5 Rebar With 33" Lap Splice In 8" Block


Quote:
Originally Posted by CJKarl View Post
They specd them for the last job I did. They ended up being more of a pain in the then they were worth in my opinion. I would double check with the engineer on the splice. As far as I know 30" is normal. 5' isn't a bad lift for 8s.
More CYA for the eng. means more labor for you. It's a good system!
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Old 07-11-2011, 04:14 PM   #13
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Re: #5 Rebar With 33" Lap Splice In 8" Block


Quote:
Originally Posted by GettingBy View Post
More CYA for the eng. means more labor for you. It's a good system!

Whats CYA?
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Old 07-11-2011, 04:43 PM   #14
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Re: #5 Rebar With 33" Lap Splice In 8" Block


Quote:
Originally Posted by CJKarl View Post
Whats CYA?
Cover Your A$$
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Old 07-11-2011, 04:54 PM   #15
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Re: #5 Rebar With 33" Lap Splice In 8" Block


Wouldnt you just drop the downrod in after the wall is done? Have the dowel stick up 33", leave a cleanout in the cell, drop the downrod when the wall is done.

If the dowel is kinda centered in the cell the downrod should be pretty centered in the cell all the way up.

You can make a ton of A blocks in short time with a gas saw. Just stack them up ends facing you and run the saw down the stack. Knockouts are better though, if you can get them or just lift them over. I would loose my mind if I had to lift a whole building over the steel. It would cost 1 mason probably 200+ blocks for the week.

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