Does the shape of the bend have any effect on reducing/increasing pull out?
It is reasonable to assume that a short semi circle or a short section at the end of J-Bolt will facilitate crushing the concrete and ease the pulling out.
How about bigger bends? let us say converting the J-bolt to a...
If you have high concentration of load on a small area where punching force is high then you may consider using some kind of bearing plates of appropriate thickness to reduce the punching force and help distribute the load in a safer way to the floor.
For years I taught first and second year physics to engineering students. I thought I was overdoing it by trying to emboss the meaning of mass and weight in engineering terms into the brains of the students. Now I can see that you can never do enough to teach engineers about the proper use of...
When joists run over beams; what is the difference in letting them ride on the beam or just hang them with joist hangers. What is the difference structurally and cost? I am not sure how expensive joist hangers are?
What is the best way to tie piers to grade beams.
Is it better to run the rebars from the pier long enough then bend them to run parallel with the rebar in the grade beam and use wire ties to join them together rather than use bent hooks between the pier and the grade beam?
Why a 100 years? Is a 100 years long enough to be assured that the wall went wash off in a big specially with a foundation higher that the water level?
The attached images are of a cylindrical core into an average serpentine rock formation I have on my project. I was cut using a coring bit. I chose an average location where I did not purposefully core in the hardest rock, I chose few soft surfaces to start the core and few harder ones. In all...
Requested a quote for drilling piers in rock, the drilling contractor has pretty big heavy duty machines. My requirement for drilling is 3 ft in competent rock or drilling refusal. The drilling contractor refusal is when his drill does not go more than one ft in five minutes. Is this a...
The material to be compacted is mainly (80%) serpentine rock at various stages in its weathering. The material ranges in size from very fine spoils resulting from grading and drilling piers to gravel that ranges from 1/4" to 4". No top soil with organic material will be allowed in the mix.
The...
Is it possible to reach 95% compaction with a vibrating plate? The compaction area is has to reach for big machines. Is it possible to have several runs on thin layers and achieve what big machine can do?
hokie66
You got it right, this what I was looking for, I have drilled piers with 4 #5 bars to be tied up at 9" OC -- the spiral with 9" (or less) pitch will do the job.
I have the following Data.
Borehole in rock with visible serpentinite presense, other kinds of rock exist as well drill refusal at 5 ft.
The sample depth is 2ft to 2.5 ft
(Blows per ft*0.63/Blows per ft) is given as >50 (blow counts obtained from Modified California Sampler were multiplied by...
How about a large and deep enough in the rock vertical pier to accommodate the main pole of the sign. Then 4 slanted(45 degrees) piers all tied to the main pier around the grade level.
Most devices that pose a safety risk to users and sold in the market has safety labels. Would not it be wise to have labels on structural elements warning that a removal or a change without the approval of an engineer will pose safety risk?
May be there should be a label for structural elements...
An Internal water proofing system for a basement in a flood zone!! This is the biggest hoax you can find for this April.
I am not sure why engineers tend to believe such ridiculous claims.
An insert at the edge of the column with not much concrete to protect the insert from the elements. The insert is rusting all along the edge of the column and thus cracked or peeled that weeks concrete bit. This is malpractice.
The insert is better at the center of the column and the weld could...
The cracking patterns show the columns are pushing up this is why you do not see crack at the bottom, may be a close visual or some magnification will show the lower side has micro cracks. If the Columns were sinking (pulling down you will see more cracks at the lower part. You can see clearly...
