Subway Action Plan: Fixing Leaks with Grouting

Grouting teams are working on tracks, live tracks and it's sometimes very difficult because they have to set up so much equipment, ladders, protection board mats. They have to take measures to protect any of the other assets from the grout. you can see how much damage it's doing because the water is dripping on everything. The leak was falling heavily on the signal box This is an applicator head with steel nipples and then from here they attach the grout plug, slides in and now it's ready to be pumped. Now this applicator will be in the floor, the wall, or the ceiling. It's drilled in. And they hit it in with a hammer or they screw it in with a ratcheting or a wrench. So now he'll install the application. And then we'll pump it so they start off slowly and then you'll start seeing water moving and then eventually you'll see the white foam coming out. And you can see a lot more grout coming back this way sealing. So now what you have to do is wait for the grout to expand which is a 20 minute window and now we'll move to the next grout clog and then keep going and then it eventually will stop the leak and then when they're finished they remove the head and then now what you see left is the plug. You know they take pride in what they do when they want to stop the leak.

Channel: mtainfo

Views: 22,469

Keywords: mta, nyc, ny, transit, bus, train, railroad, bridges, tunnels, transportation

Id: 7lMYiTes2XU

Length: 2min 3sec (123 seconds)

Published: Mon Nov 26 2018

Reddit Comments

[u/[deleted]]

I love this and the MTA should make more vids like this but I have a question...

Shouldn't you be concerned about where the water is coming from? Yes I understand there is a crack and water is coming in through the crack, but how did water end up in the general area above the crack to begin with? I mean, is there a leaky pipe, or is it stray drainage? If you just seal the crack, thats a good temporary solution, but whatever is allowing water into the area will continue to do so, and now that 'that' particular crack was sealed, that stray water will just end up going to the next crack as it spreads out.

Also, water with many salts in it can cause the erosion of materials over time. The salts, lets say are Sodium Chloride for example, are dissociated into ions in the water and the CL- ions seap into concrete. Its what tends to destroy bridges and rebar inside of concrete. My worry is that there is a leak ahead of this leak that needs to be patched or sooner or later that water will cause erosion of the grout and surroundings and you'll be back in the same situation again.

Would love to hear some opinions on this. Keep up the good work.

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