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Mushroom Monument

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(@john-thompson)
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I found this today while retracing a subdivision from 1952. Plat calls for "3/4" iron rods" at lot corners. One other lot corner had a head like this, and the others that I found appeared to have heads broken off. I don't know how long it is, but it felt solid. The stem is smooth, not ribbed. This photo shows #5 and #6 rebars for reference.

I've never seen one of these before. What is this thing?

 
Posted : January 30, 2017 8:11 pm
(@peter-ehlert)
Posts: 2951
 

could it be a tamper? for compacting alongside fence posts? I see them in hardware stores occasionally.

 
Posted : January 30, 2017 8:29 pm
(@paden-cash)
Posts: 11088
 

Strange. It appears to be deformed or swaged deliberately.

I have seen similar ends on cross braced turnbuckles from girder structures, but not curved on its seating surface. I bet it's a piece of salvage that wound up doing eternity as a property pin.

 
Posted : January 30, 2017 8:37 pm
 jpb
(@jpb)
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If it is solid, we would refer to it as a timber bolt. I can't tell from the picture. If it is, it may be threaded further down. It also may have two or three ribs under the mushroom to bit into the wood.

 
Posted : January 30, 2017 8:41 pm
(@a-harris)
Posts: 8761
 

The end looks to have been heated and rolled back to form a cap.

 
Posted : January 30, 2017 8:54 pm
(@holy-cow)
Posts: 25292
 

The closest thing to that I can think of is a railroad crosstie spike. It definitely is not one of those. They do have a wide, circular top that is thicker in the center than near the edges. But, not like what is shown.

This reminds me of a subdivision with rear axles, including the lug bolts, used as lot corners. The surveyor was also the operator of a car salvage business.

 
Posted : January 30, 2017 8:58 pm
(@sergeant-schultz)
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Around here it would be labeled as "FIP" or "IPF".

 
Posted : January 31, 2017 3:35 am
(@paul-in-pa)
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Timber or dock bolt. Around here you might find them near old canal locks or RR trestles, along the river in NYC or Philly. Came across a few along the Morris Canal.

Paul in PA

 
Posted : January 31, 2017 4:14 am
(@nate-the-surveyor)
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Sergeant Schultz, post: 411672, member: 315 wrote: Around here it would be labeled as "FIP" or "IPF".

Yup that's it!

 
Posted : January 31, 2017 4:31 am
(@john-thompson)
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Thanks, guys. Maybe I'll just go with 3/4" iron rod. Although it does look more like 5/8".

 
Posted : January 31, 2017 8:07 am
(@mitchptd)
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Where abouts are you located? Planting Pins in frozen ground, gravel etc here can do that. Sometimes, sledgehammering an Iron pin into such a surface causes the head to mushroom, especially when using a Pjonjar or Atlas Cobra to drive it in. In winter time in Canada, planting an IP can take about 20 minutes of pounding before it goes in.

 
Posted : January 31, 2017 8:23 am
(@john-thompson)
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I don't think the mushroomed top is from installation. There were two of them that I found that were the same shape. The top is rounded and there is a lip around the edge that is curved up. I'll try to get a better picture if I go back. Original plat is dated April, so the soil should have been soft.

 
Posted : January 31, 2017 8:54 am
(@imaudigger)
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Looks to be a homemade monument.

Maybe a large hot rivet head welded onto the end of a very old/corroded piece of re-bar?

Looks like something that would be driven into the ground to hold a parking stop or driven through pieces of cribbed timber.

 
Posted : January 31, 2017 9:11 am
(@kris-morgan)
Posts: 3876
 

Champion Paper Company made us set monuments that look very much like that. They were 1/2" or 5/8" shafts with a 2" domed head and the last 6 or 8 inches was threaded like a VERY large carriage bolt. So, we called them timber carriage bolts.

 
Posted : January 31, 2017 12:56 pm
(@james-fleming)
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Kris Morgan, post: 411753, member: 29 wrote: Champion Paper Company made us set monuments that look very much like that. They were 1/2" or 5/8" shafts with a 2" domed head and the last 6 or 8 inches was threaded like a VERY large carriage bolt. So, we called them timber carriage bolts.

http://www.portlandbolt.com/products/bolts/timber/

 
Posted : January 31, 2017 1:09 pm
(@Anonymous)
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I'm curious as from Down Under it looks like a domed headed spike (railway) in a pipe with a square top.
What's that squared partial rim just under the domed bit? Looks like a slight gap at the corner of square section.

 
Posted : January 31, 2017 1:37 pm
(@jim-in-az)
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I'm curious about the 2 rebar alongside...

 
Posted : January 31, 2017 1:40 pm
(@scott-ellis)
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Jim in AZ, post: 411771, member: 249 wrote: I'm curious about the 2 rebar alongside...

He added those for size comparison

 
Posted : January 31, 2017 1:46 pm
(@a-harris)
Posts: 8761
 

[USER=833]@Richard[/USER]

That is squared to "seat" the bolt into the wood to keep it in place and from rotating.

 
Posted : January 31, 2017 1:53 pm
(@billvhill)
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Almost looks like a railroad spike pounded into a pipe.

 
Posted : January 31, 2017 2:06 pm
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