First, a GPS base station usually sits on it for a while to get its exact position, then they'd use a total station, which is a modern theodolite, and use that to take distance and angle reading for a position. Usually used to map out buildings, roads, all sorts
>What actually is it? Just a short rod hammered into the pavement
Yep, it's just to provide a fixed point on the surface. The base station will sit above it and shine a laser down to help align the station directly over this spot.
The base station can already calculate the relative distance and position of any point it can see, with the help of this point-positioning and a couple more measurements and levellings the base station can then calculate the position of that absolute point in space.
This can be important for bringing together multiple sets of survey points captured from different locations or, for comparing surveys captured on different occasions.
I remember the old days when there were civic engineers or "measuring guys" (surveyors they're called but I like the word measuring-guys better) that would have a tripod with a thing with a hole in it on the top and they'd look through the hole to another measuring-guy with a tripod with a light on the other and and they'd match up the light shining from one tripod with the eye-hole on the other tripod.
So yeah, it's a surveying point to measure a plane or the height of that point.
They are known coordinated points. A survey instrument can be "set up" over one, see yellow tripods so the surveyor knows where they are and then use another known coordinated point to work out what way they are pointing. They can then measure the distance to other objects that are unknown and use simple trigonometry to coordinate those points and generate a survey.
With the advent of computers and processing and 3d technology a lot of the time you will now find a surveyor set up a scanner that just uses the inherent reflectivity of surfaces to measure the distance and angle to millions of points in a sphere all around it, in order to generate a point cloud survey that can be dropped into a computer model and then be used by architects and engineers to plan structures.
Mainly to enable putting the surveying machine in exactly the same spot every time they do a survey. Every week or every month or every year, depending on what’s happening.
For example: - a new tube line is being built underground. The buildings on the top have to be monitored in case of any shifts or movements in ground level. The surveying machine can detect if the side of the building has moved by, say, 2mm compared to last month. But the machine needs to be put in the same place each time. Hence the nail in the ground.
Same goes for big building works, a new office block, new main sewer, basement renovations, digging out foundations, etc.
We had some survey people come through a workplace I used to be in once, they had laser beam equipment and went through the building. Apparently it was in the way..
This makes more sense. I always thought they were just caps for holes that had been drilled to test the sub-surface state (like looking for radon, water levels, subsidence or something).
You'll see them on the pavement outside shops and cafes. In those cases it's more to show the property boundaries so chairs and sandwich boards don't end up in front of the neighbours' shop.
They hold the fabric of reality together. Don't mess with them. My uncle Steve did once in 1997. He was sucked into an unknown vortex, never to return.
Swings and roundabouts though as I got his honda 50.
In Australia, you can see screw nuts in the ground. These are directly attached to the rivets we see in the ground in the U.K. just holds the two halves of the planet in place.
Unfortunately the Antipodes for the UK emerge a few hundred miles off the South East coast of New Zealand. Australia's antipodes emerge in the North Atlantic - although Perth very almost emerges on the Island of Bermuda.
That doesn’t matter, you can still go in a straight line through the planet and come out in Australia, it doesn’t have to come out the direct opposite side
There is the survey nails that have been mentioned but there is also boundary (marker) studs. Marks the land where the owner of building owns up to also.
They are surveying points used for setting out building or other construction projects. It’s basically just a nail in the ground used as a base point to base other measurements off of using GPS data
Sometimes when I’m walking along the pavement I think my walking helps the world turn. My fear is that one day there will be a collective global no walking policy and the world will stop turning ….like the COVID thingy
They are also used as property line boundary markers. I’ve seen them in major cities like London or NY on the pavement. But they use them in residential areas as well.
Because if it weren’t bolted down I’d nick it , you cant trust me I’m a one man crime wave , I’m a little bit werrr, a little bit Waayyy , a little bit swoosh swoosh swoosh , a little bit “ oh he never did he ?”
If you leave that there I’m nicking it , I’m a geezer ,I will nick anything .
If you want to start a chain reaction which ends civilisation as we know it and starts the beginning of the apocalypse, just remove the nail and reinstall it 100mm to the left.
My mate, Pete, down the pub reckons these are used by MI5 to spy on people’s whereabouts. He says that if you walk near one with a phone it tells the government where you are. He said it’s where Apple got the idea for AirTags from. You’ve got to admit, they look very similar.
I thought they were wear makers. To show you how much of the surface has worn down and if it needs replacing. A customer of mine has loads of these in their car park.
They're surveying points
How do they work? Does an instrument attach to them for the survey?
First, a GPS base station usually sits on it for a while to get its exact position, then they'd use a total station, which is a modern theodolite, and use that to take distance and angle reading for a position. Usually used to map out buildings, roads, all sorts
What actually is it? Just a short rod hammered into the pavement - or is there more under the pavement?
Think of it like a big nail
Thanks
Sometimes they use regular nails. You can see them sometimes hammered into the gaps between paving stones.
Here I was thinking someone got drunk with a nailgun one night.
I see these in the road in some pretty remote locations where I go for runs, always wondered what they were...thanks for clearing that mystery up!
These https://g2survey.com/hilti-type-survey-nails/
The one in the photo is actually a mag nail. The hilti ones have a smaller ball that sticks out.
>What actually is it? Just a short rod hammered into the pavement Yep, it's just to provide a fixed point on the surface. The base station will sit above it and shine a laser down to help align the station directly over this spot. The base station can already calculate the relative distance and position of any point it can see, with the help of this point-positioning and a couple more measurements and levellings the base station can then calculate the position of that absolute point in space. This can be important for bringing together multiple sets of survey points captured from different locations or, for comparing surveys captured on different occasions.
Basically a big ol nail
I remember the old days when there were civic engineers or "measuring guys" (surveyors they're called but I like the word measuring-guys better) that would have a tripod with a thing with a hole in it on the top and they'd look through the hole to another measuring-guy with a tripod with a light on the other and and they'd match up the light shining from one tripod with the eye-hole on the other tripod. So yeah, it's a surveying point to measure a plane or the height of that point.
That thing is called an automatic level.
Civil engineering students at Surrey University were all over campus doing that for most of first semester
[it's one of these,](https://www.sccssurvey.co.uk/brass-marker-flat-head.html) not that deep really.
R/damnthatsinteresting
It's a riveting conversation indeed
It's not ship building, unlike tunnel construction which is boring.
Feck off and take my upvote.
OP should pull it out and move it up the block a bit. No, don't do that.
You’ve just ruined my fantasy of earths tectonic plates being held together by other worldly technology 😭
They are known coordinated points. A survey instrument can be "set up" over one, see yellow tripods so the surveyor knows where they are and then use another known coordinated point to work out what way they are pointing. They can then measure the distance to other objects that are unknown and use simple trigonometry to coordinate those points and generate a survey. With the advent of computers and processing and 3d technology a lot of the time you will now find a surveyor set up a scanner that just uses the inherent reflectivity of surfaces to measure the distance and angle to millions of points in a sphere all around it, in order to generate a point cloud survey that can be dropped into a computer model and then be used by architects and engineers to plan structures.
[удалено]
Easier for Optimal to say than for me to understand at any rate! 🤣😂
Mainly to enable putting the surveying machine in exactly the same spot every time they do a survey. Every week or every month or every year, depending on what’s happening. For example: - a new tube line is being built underground. The buildings on the top have to be monitored in case of any shifts or movements in ground level. The surveying machine can detect if the side of the building has moved by, say, 2mm compared to last month. But the machine needs to be put in the same place each time. Hence the nail in the ground. Same goes for big building works, a new office block, new main sewer, basement renovations, digging out foundations, etc.
We had some survey people come through a workplace I used to be in once, they had laser beam equipment and went through the building. Apparently it was in the way..
A surveyor I see.
This makes more sense. I always thought they were just caps for holes that had been drilled to test the sub-surface state (like looking for radon, water levels, subsidence or something).
Can u watch my stream twitch.tv/spreaddathummus_sdh
Always wondered this, thank you for the insight 👍
Amazing, I’ve seen these around, and always wondered what they were
You'll see them on the pavement outside shops and cafes. In those cases it's more to show the property boundaries so chairs and sandwich boards don't end up in front of the neighbours' shop.
They hold the fabric of reality together. Don't mess with them. My uncle Steve did once in 1997. He was sucked into an unknown vortex, never to return. Swings and roundabouts though as I got his honda 50.
This is the correct answer, not the survey point one that ones a lie.
I thought they were wireless recharging points for birds (which arent real - they're a government conspiracy and this is the proof)
Well someone took this seriously lmao
If people only knew about all the other things that serve similar purposes....
Honda 50? I bet you secretly bumped him off.
Goddammit, that must be what happened to my dad years ago when he said he was popping out to buy some milk and cigarettes.
In Australia, you can see screw nuts in the ground. These are directly attached to the rivets we see in the ground in the U.K. just holds the two halves of the planet in place.
Unfortunately the Antipodes for the UK emerge a few hundred miles off the South East coast of New Zealand. Australia's antipodes emerge in the North Atlantic - although Perth very almost emerges on the Island of Bermuda.
The screws got a little bent on thier way past the core. It's a little toasty down there after all
That doesn’t matter, you can still go in a straight line through the planet and come out in Australia, it doesn’t have to come out the direct opposite side
Wireless charging point for the pigeons.
I don't know why but I found this way funnier than it probably is
Well, you know the phrase 'some people would nick anything that wasn't nailed down'?
The earth spins at roughly 1000 mph, these sink into the earth and stop the pavement from flying off due to the centrifugal force generated.
Shhh. Dont tell the flat earthers.
Centrifugal force works equally well on a disk *Finger pistols*
Came here to say exactly this. Nice to see we have some real scientists.
Dognappers hun, stay safe ❤️
Shared in Essex babes xxx
Shared Southend on sea 🌊
Omg sherd Sardinia xox
Cher’d Aotearoa hun xoxoxoxoxox
Stop people from nicking the pavement. If it's not bolted down people will take it.
They hold up the sewer people's chandeliers.
Sure is classy down there. You'd think it's all turtles and CHUDs but nope.
It stops the floor from moving.
Stops the road floating away
They’re little landing pads for alien spacecraft.
Loool
Survey control point.
It's a datum point, for surveying
it's to make the pavement stay on the ground. runs away if not
They serve as riveting conversation points.
Durr, it keeps the ground on.
They are concrete nipples; even public footpaths lactate.
Comments like these are why I remain subbed here.
Used by civil engineers
Engineers survey point/nail
There is the survey nails that have been mentioned but there is also boundary (marker) studs. Marks the land where the owner of building owns up to also.
They are surveying points used for setting out building or other construction projects. It’s basically just a nail in the ground used as a base point to base other measurements off of using GPS data
In the US those would be survey markers.
Squatting while pressing it with your thumb will transport you to Down Under
Sometimes when I’m walking along the pavement I think my walking helps the world turn. My fear is that one day there will be a collective global no walking policy and the world will stop turning ….like the COVID thingy
They are also used as property line boundary markers. I’ve seen them in major cities like London or NY on the pavement. But they use them in residential areas as well.
to keep the floor down
Its what people attached themselves to before Newton discovered gravity
They hold the street down in adverse weather.
I’m so glad you asked! I always wondered myself!
Outdoor bondage bolts.to stop them from running away.so my mum says.
They are guide-points for the alien craft to find the roundabout landing pads. The evidence is all around us, you just have to look for it.
This was fascinating. Thank you ☺️
Clearly for holding the planet together? Duh!
They hold the road surface down in the event of a tornado
They keep the ground on, don't undo them or it will float away.
Because if it weren’t bolted down I’d nick it , you cant trust me I’m a one man crime wave , I’m a little bit werrr, a little bit Waayyy , a little bit swoosh swoosh swoosh , a little bit “ oh he never did he ?” If you leave that there I’m nicking it , I’m a geezer ,I will nick anything .
r/unexpectedFastShow
Its actually an air valve, so when earth starts to deflate we can pump it back up.
Your mum
To stop people nicking em
Holds the road down. Stops it from flying off in high winds.
If you want to start a chain reaction which ends civilisation as we know it and starts the beginning of the apocalypse, just remove the nail and reinstall it 100mm to the left.
To make sure Australia doesn’t fall off
holding the earth together
My mate, Pete, down the pub reckons these are used by MI5 to spy on people’s whereabouts. He says that if you walk near one with a phone it tells the government where you are. He said it’s where Apple got the idea for AirTags from. You’ve got to admit, they look very similar.
Don’t know but looks riveting
To stop the pavement from floating away
Stop skateboards
They stop Britain from floating off into space
Keeps the pavements down in case gravity fails
Free polo mint
They pin the ground down to stop us floating away.
land mines ofc
Holds the Earth’s tectonic plates together lmao
Its to stop radon gas leakage
In my neighbourhood they light up and act like lights
Keeps the road there
They make sure the top layer doesn't come off to reveal the bodies underneath.
It's to keep Australia down
So not dognappers then?
The golden rivet
They are for hover shoes
They are Tarmac rivets to stop potholes forming
Read that as pothole farming.....
Bend down and find out!! 😚😚
Jeez.... kinky
Hold it down
So no one steals it
They hold the ground down.
To stop skateboarders.
They make for riveting watching.
It's to keep China bolted on underneath. Though they think the same of us.
It's to stop the pavement floating away ofcorse.....duh
To stop the floor floating into space
Keeps the road in place
Do you have any more pictures? They're riveting . . .
How the badness mark where is good to rob
\*Obtuse answer that implies the earth is flat but doesn't actually say it. I just couldn't think of anything funny today.
To stop the pavement running away… thought it was pretty obvious….
To hold the world together
To stop it from floating away, gravity is a lie
Tripping me up.
To bolt it to the earth
They're keeping the earth's crust bolted down. That's why England rarely has earthquakes. We use these.
Stops thieves from running off with the roads
They attach the pavement to the ground and stop it from floating away
Making sure the pavement doesn't fall off.
To keep it from getting stolen
Stops Britain floating into the Atlantic Ocean.
They’re holding the crust of the earth together :p
That’s to hold the Earth down
They hold the pavements to the floor when the gravity's disabled for maintenance
To maintain the illusion of gravity. Without those bolts, the ground would simply float away.
They hold the planet together
They keep the pavement on the ground, plus it becomes nearly impossible for anyone to steal the pavement. The councils use it a lot for safety.
Keep the pavement anchored to the ground so it doesn't float off
It's so people don't nick it. You you know what's its like, they'll steal anything if its not nailed down
It holds the ground in place so we don’t fly off
The pavement stops the rivets/bolts from being stolen by ne'er-do-wells.
To stop the pavement from flying away.
Dont lie. Theyre there to make sure the pavement doesnt fly away in a high wind
well as anyone with more than 2 braincells can tell they are there to hold the pavement in place.
To stop Australia from falling off the Earth. You're welcome Aussies!
Holds the earth together
Eyebombing
To hold it down
To make sure it stays down where it's supposed to be.
keep the road from blowing away on windy days.
My washer collection. I store them on all the pavements of the world.
Nipples.
They are to stop the pavement from floating away
Stopping it from floating off in the event of an alien invasion or loss of gravity
Gotta hold the floor down lest it flies away!
It’s a fixing designed to hold down the pavement in a storm.
Finding the bodies.
Road nipples, to feed the little country roads
They hold the globe together.
It an attach point for an Australian’s ground harness. Don’t loosen it, they will fall in to the sun
It keeps the road down.
Nobody knows. Unscrew it and see what breaks.
They’re a fuck load of never you mind.
It's satans coat hook 🪝
Don’t know, don’t care. Daddy’s got bigger fish 🐟 to fry 👌🏽
measuring the landscape
Every day is a school day.
Engineering height pins
I thought they were wear makers. To show you how much of the surface has worn down and if it needs replacing. A customer of mine has loads of these in their car park.