Digging a Secret Garage Part 3
Summary
TLDRThe script details a DIY project to build an underground garage with a tunnel system connected to the house, designed for a DeLorean to emerge from. The project involves extensive digging, steel room construction, and complex reinforcement with rebar. Challenges include ensuring structural integrity, dealing with damp proofing, and managing the weight of concrete. The creator uses a cardboard model to visualize the project's scale and layout, providing updates on the progress and future plans, including a lift mechanism and turntable system for the car.
Takeaways
- ๐ The project involves creating an underground garage connected to tunnels within the house for a DeLorean car.
- ๐จ Initial digging was done manually but proved too difficult, leading to the use of a digger to excavate a large hole.
- ๐ The garage will feature a lift mechanism for the car to rise from the ground and a turntable system for easy maneuvering.
- ๐ ๏ธ The construction process has been challenging, with the builder having to double-check designs and use reinforcement techniques.
- ๐๏ธ A structural engineer was consulted to ensure the safety and stability of the concrete structure, especially with the weight of the car in mind.
- ๐ง The builder used a volumetric mixer for the concrete to precisely control the amount and consistency of the mix.
- ๐ Reinforcement was done using both traditional tie wraps and a modern tie gun for efficiency.
- ๐ช The project requires careful planning to align with the house and other structures, as the builder works with various angles and levels.
- ๐ณ The builder took steps to protect the environment by replanting a removed tree and using protective materials for the garden.
- ๐ The builder is documenting the cost of the project and plans to share a final cost breakdown in a future update.
- ๐ Despite the progress, there is still a significant amount of work ahead, including digging, reinforcing, and pouring more concrete.
Q & A
What was the initial state of the drive four months ago?
-Four months ago, the drive had a tunnel system leading from inside the house to a dead end, as more digging was required.
What major change was made to the drive during the project?
-A significant change made to the drive was the introduction of a digger to create a large hole, which marked the beginning of the construction of an underground garage.
What is the purpose of the underground garage?
-The underground garage is being built to house a DeLorean, which will be able to rise up out of the ground through the tunnels leading into the house.
How has the project progressed in terms of design and construction?
-The project has evolved from a cardboard CAD model to the actual construction of a steel room with reinforced concrete. The design has been adjusted to include vertical steel joists and a complex rebar system for structural integrity.
What challenges were faced while installing the rebar for the concrete walls?
-The challenges included bending the strong rebar, positioning it correctly in a confined space, and ensuring it did not touch the steel room or the ground to maintain its structural integrity.
What is the significance of the geotechnical survey in the project?
-The geotechnical survey provided crucial information about the firmness of the clay, which helped in designing the foundation and the amount of reinforcement needed for the structure.
How was the rebar positioned and held in place during the concrete pouring process?
-Pegs were welded onto the steel room and rebar to hold it in position, ensuring that the concrete did not move it around when poured.
What is the role of the horizontal RSJ beam in the design?
-The horizontal RSJ beam is intended to counteract the expansion of the clay when it gets wet, preventing it from pushing against the walls with excessive force and keeping the room level.
What is the next phase of the project after the current excavation?
-The next phase involves digging up to the side of the door and straight down, but not as wide as before due to the proximity to the house. The depth will also be increased to accommodate the lift mechanism for the car.
How does the creator plan to maintain the rock face wall during the construction?
-The creator plans to leave a section of the rock face wall exposed, potentially using a system similar to those used in skyscrapers to manage any condensation issues.
What is the creator's long-term goal for the completion of the project?
-The creator aims to complete the project within the year, with the intention of having a fully functional underground garage with a lift mechanism for the DeLorean.
Outlines
๐ Underground Garage Construction Begins
The video script opens with the narrator describing the initial state of his drive four months ago, which was a tunnel system connected to his house. The narrator explains that they started digging for an underground garage to house a DeLorean, but the task proved too difficult, leading to the use of a digger to create a large hole. The narrator expresses surprise and concern over the scale of the project, but remains excited about the DIY endeavor. The video then transitions to an update on the project, highlighting the narrator's YouTube channels and the progress made so far. The narrator discusses the design and scale of the project, using a cardboard model to illustrate the plans. The video ends with a focus on the structural integrity of the garage, mentioning a consultation with a structural engineer and the reinforcement of the concrete with steel joists.
๐จ Challenging Reinforcement and Concrete Work
The second paragraph details the complex process of reinforcing the underground garage's walls and floor with rebar. The narrator describes the challenges of bending and positioning the rebar, especially in tight spaces and under the weight of the concrete. The use of a structural engineer's advice is emphasized, as the rebar is designed to handle the forces exerted by the ceiling, clay expansion, and rock. The narrator explains the use of a geotechnical survey to understand the soil conditions and the importance of proper rebar placement and connection. The paragraph concludes with the narrator discussing the use of a volumetric mixer for the precise application of concrete, and the decision to build the walls in separate concrete pours to manage weight and damp-proofing considerations.
๐ Planning the Car Lift and Room Expansion
In the third paragraph, the narrator outlines the next steps in the construction process, focusing on the design and function of the car lift mechanism. The plan involves a horizontal RSJ beam to manage the clay expansion and a series of rebar hoops to tie the structure together. The narrator also discusses the need to deepen the room to accommodate the car lift mechanism and turntable system for the DeLorean. A model is used to visualize the final layout, showing the car's entry and exit point, as well as the turntable area. The narrator expresses excitement about the project's potential, despite acknowledging the significant amount of work that remains.
๐ง๏ธ Preparing for Further Excavation and Construction
The fourth paragraph describes the preparations for the next phase of excavation and construction. The narrator talks about the need to dig further while being cautious not to destabilize the house's structure. The plan involves digging up to the side of the doorway and straight down, creating a deeper area for the car lift mechanism and turntable. The narrator also discusses the logistics of the excavation, including the protection of the garden, the removal of a boundary stone, and the use of tracking to protect the lawn. The paragraph ends with the narrator's intention to continue the project after a short break, citing the desire to complete the garage within the year, despite the challenging weather conditions.
๐ฅ Reflecting on the Project and Future Plans
The final paragraph reflects on the progress made in the project and the future plans. The narrator talks about the creation of a physical model of the project, which he finds satisfying amidst the challenges of the actual construction. He contrasts this traditional approach with modern computer simulations, appreciating the tactile nature of the model. The narrator also mentions the ongoing rain and its impact on the project, expressing hope for better weather in the future. The video concludes with the narrator's intention to take a short break from the project before returning to complete it, and he invites viewers to guess the final cost and ask questions for a future Q&A video.
Mindmap
Keywords
๐กUnderground Garage
๐กDeLorean
๐กTunnel System
๐กDIY Project
๐กStructural Engineer
๐กReinforcement
๐กGeotechnical Survey
๐กVolumetric Mixer
๐กDamp Proof Membrane
๐กRebar Bending
๐กLift Mechanism
Highlights
The project involves creating an underground garage connected to tunnels within the house, allowing a DeLorean to rise up from the ground.
The garage is being built with a significant amount of DIY effort, and the video documents the progress and challenges faced.
The design includes a steel room set in concrete with vertical steel joists and a reinforced mesh application for structural integrity.
A geotechnical survey was conducted to assess the clay and rock conditions, which informed the design and construction process.
The construction process involves complex rebar bending and positioning to ensure the structure's stability and resistance to pressure from the surrounding soil.
A volumetric mixer is used for the concrete, allowing for precise control over the consistency and quantity of the concrete used.
The project includes a horizontal RSJ beam to counteract the expansion of the clay when it gets wet, ensuring the room remains level.
A damp proof membrane is used to prevent moisture from affecting the concrete structure.
The garage will feature a lift mechanism for the car and a turntable system for easy maneuvering.
The project has reached a milestone with the second channel passing a million subscribers, showcasing the popularity of the construction series.
The builder uses a cardboard AED design to model the construction process, which helps visualize the project's scale and layout.
The builder emphasizes the importance of measuring and aligning the structure with precision, as the project has to be parallel with various elements of the house and garden.
The project's scale is such that it will be a significant addition to a three-bed semi-detached house, with the builder aiming to complete it within a year.
The builder plans to leave a section of the rock face exposed for aesthetic purposes, despite concerns about potential condensation issues.
The builder is mindful of the environmental impact, ensuring that a tree removed during construction is replanted in the countryside.
The builder is documenting the cost of the project, intending to provide a breakdown at the end to offer insights into the financial aspects of such a large-scale DIY project.
Transcripts
4 months ago this is what my drive
looked like and you could go down the
tunnel system from inside my house and
you would reach a dead end as there is
more digging to be done so we started
digging the drive but we realized this
was going to be much too hard so we got
the Digger in and made a huge hole oh my
god what have I done there is no going
back but what am I doing this for so I'm
building an underground garage linked to
the tunnels which go up into my house so
my DeLorean can rise up out of the
ground subscribed this is going to be
totally awesome this is the biggest DIY
project on the
[Music]
Internet it's getting
there right Colin what you been up
[Music]
to oh yes is this the year people when
the DeLorean comes up at the drive okay
welcome to secret garage update 3 now
then people that have been subscribed to
the second Channel thank you very much
it has passed a million subscribers
absolutely amazing you've been watching
all the construction some of the long
form videos of how this thing's been
built now today in this video I'm going
to talk about the design talk about the
wise cuz let's face it I've been doing
things in completely the wrong order
it's been making my life difficult as
well as the weather now up until now
this has been my cad model my cardboard
AED design as to what's happening what's
going on but there's a lot of questions
and a lot of people are obviously not
quite understanding the scope and the
full picture of this project so I think
we need in true Doc Brown style we need
a
mle do whatever
[Music]
he ground what El here is
a how cool is
this this is
brilliant
now sorry for the crudeness and it's not
quite to scale actually that is totally
not true it is bang on scale we got to
get you back to the future references in
hav
[Music]
you now as you can see this is the scale
basically 10 cm on here is 1 meter in
reality so I think that makes this a 10
to1 scale now unfortunately my DeLorean
I think is 18 to1 so it looks a little
bit lost never
need to find a bigger DeLorean model so
you can see where we're at we got the
tunnel sticking out down here just below
the house very nice and then basically
we've dug up to this little line here
that's what we've excavated so far and
of course the bit of room that we've
made is this so This bit here goes in
here that is what has been constructed
so far so here we are in that
beautifully fabricated steel room now
while I was doing this well particularly
when I was doing the ceiling that's when
I looked up and I thought there is a lot
of concrete going over the top of this
it is not just really thick but is also
really wide and at that point I thought
I better just get this double checked so
my design consisted of the steel room
set in the concrete with some vertical
steel joist welded to the side of the
wall mirrored on both sides and of
course across the top was some e of
bigger steel joist so at the Central
Point here the concrete was looking
about being 5 to 600 mil thick and of
course that across the whole thing
that's a lot of weight that is so had a
structural engineer check this this part
actually okay it's in the reinforcing
mesh application where things started to
differ right so here's Collins's rebar
he just slides that down into the
concrete for the floor slab which by the
way was a nightmare to put in we're not
doing that like that I'll get on to that
later but as well as that Mr structural
man he wanted the second one ride up
against the wall behind it now that
would have been okay I'll just slide
another one but no there's more
complications he just didn't want it
flat he wanted it bending and tying in
to that bottom floor slab so it Keys
into the bottom bit and as difficult as
this was to get in it does make sense
wish I can demonstrate with this
wonderful test now all the forces on my
walls are coming from the weight of the
ceiling the expansion of the clay and
The Rock basically trying to push itself
into the room now if you can imagine
this is the reinforced mesh in the
concrete when something is pushing
against it it's trying to bend it but
also as it bends it loses height it gets
shorter so basically what that's doing
is it's pulling on the top slab and
pulling up up on the floor and by
bending that rebar round you divert some
of those forces so they're not just
pulling up but they're pulling across
and then they're pulling on the whole
concrete slab going across the floor
Distributing that load even further now
we can calculate these forces quite
precisely cuz I had a geotechnical
survey done this is basically a dude
which comes out takes Rock samples and
sends them off for Crush tests and then
has this little twisty device which he
puts into the clay tells him How firm
the clay is tested it we're in firm clay
what's after firm firm can you get is
after firm is stiff stiff stiff after
firm very stiff then very stiff we got a
firm on we are now it's about 5 minutes
into the video and before you see me
struggle trying to get this bent rebar
in and actually bend the rebar it's time
for
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let's see how I choose to bend this
rebar now despite only being 10 mil
thick rebar is pretty strong and very
difficult to bend so I fabricated myself
a little bending device which you just
slot on and it makes it very slightly
easier but the problems don't end there
now getting this round and under here is
going to be a bit of a peg trimming the
rebar trimming the Rocks getting it
stuck getting me stuck working in a
confined space this was a tricky
job now adding to this already difficult
job is the fact in an Ideal World this
stuff doesn't want to be touching
anything other than concrete doesn't
want to be touching the ground doesn't
want to be touching my steel room so as
well as trying to bend it and fish it
under the floor I need to hold it in a
position so when the concrete comes down
it doesn't shove it and move it all
around and get it in the wrong place now
we achieved this by welding pegs onto
the steel room and onto the rebar to
hold it into position and this worked an
absolute treat even with concrete
flooding round it it never shifted
anywhere and once it's all set we're
good to go with the next bit so we're
left with this about 400 mil of rebar
sticking out of the concrete and the 400
mil is important cuz every time we join
our rebar we have to go 40 times its
diameter if it's 10 mil of course that
gives us 400 mil boom so now we need to
bring another bit down and overlap it
and connect it onto our rebar but it
still has to not touch the room and then
of course after that we need a secondary
layer in front of that one now to attach
this rebar to the lower part there's two
common methods you got old school with a
tie and a tie wrap wrap it around hook
it on spin it until it goes tight and
then just fold it over or there's the
modern method one of these a tie gun
basically just put the Jaws over it pull
the trigger and it ties it automatically
absolutely fantastic saved me so much
time with the pegs we welded on to hold
the rebar in place removed we carefully
lowered the new rebar down into the
garage I proceeded to put it into place
tie it to our bottom bit of rebar I then
bent individual pieces to tie to our
vertical rebar to wrap around the corner
to form a continuous mesh then with the
secondary layer fitted and spaced off
it's time to fill it in with
concrete now it's very difficult to know
how much concrete you're going to need
so for this project we've been using a
volumetric mixer this is basically a
cement mixer which has separate Bays for
the sand and the gravel and the concrete
they come down a conveyor belt mix at
the entry port and then of course you
can use as much or as little as you want
and also you can make it as wet or as
dry as you want or you can change it
halfway through the process this is
ideal for our application to get it
flowing at the right consistency and to
the level we require that's all gone off
nicely as you can see in there now we
didn't form this whole wall in One
concrete B for two reasons the first one
is weight concrete is heavy when we were
doing the bunker we absolutely piled
loads of concrete down on top of the
tunnel and we noticed a very slight bow
forming in the walls so to mitigate that
we just distributed the concrete more
evenly but these walls are a lot taller
this room is a lot higher they're going
to suffer from that even more so we've
got thicker box section but also down
this side wall we put a load of 45ยฐ
braces to properly hold it up and if you
remember when I actually built the room
I had these plates of all the little
circular holes in so we're halfway up
they'll get knitted in so once it goes
off the proper solid it's good and now
the second reason is damp proof membrane
Now The Damp proof membrane doesn't come
all the way down to the bottom because
at this layer of the rock this is better
draining than anything when we dug the
tunnel anything below this point was
bone dry the whole time we've done it
any moisture or water that gets down to
here will just dissipate through the
rock but as well as this we want the
concrete to fill in all these gaps so
like properly Stitch it into the ground
cuz any stresses any forces any movement
pushing against the room the more it's
connected to its surrounding area the
better so bit of dprof membrane down to
there fantastic there's your second P
[Music]
boom I've got this great idea to get me
out of
here right we've got our rebar up we've
got our membrane down and we've got
concrete to here the last part we need
to do to complete these walls is to add
a horizontal rsj beam across
[Music]
here now this is to basically take the
expansion of the clay because this top
seam is in the clay when that gets wet
it expands it is going to push on these
walls with a lot more Force so that is
to basically keep the whole room level
and straight across the whole thing all
good and then we need to get some
rebound and attach it over the top here
to knit the two bits together and we do
this with these little Hoops which I've
had pre-formed very
[Applause]
nice and this isn't just to uh make it
look very nice cuz the whole thing runs
around nice and level does look very
good it's so when we do the rebar going
across the top which of course needs to
take all the weight of the vehicles it
all ties in and knits together so that
goes onto there like so then there's a
lower one which will also come
underneath those beams and the whole
thing will stitch in and that is where
all our strength
is so got my rebar walls formed then we
got a bit of shutter in shuted this end
off here just underneath the horizontal
bar filled that up with concrete and
that gives us like a bit of a boundary
wall and of course remove the plywood
you can see that looks very nice we've
got an extra bit of rebar which is going
to head over the roof as well then after
that we took all the lead off and
everything and it can expose the project
for the actual scale it
[Music]
is thank my
good it
time I have known known and that brings
us back to the future back to the
present day now I've been working on
this for about 3 to 4 months which is a
very long time but this was always going
to be the most difficult part getting
this all set out getting it aligned
taking the time to measure everything
cross reference it making sure we're
building this in the right place because
this has to be parallel with the house
the garage the garden and everything are
all funny angles and all go off at a
different tangent so I can't use them as
references so I had to use the house and
we're not quite under the house yet so
this was all have to be done off the
walls which we can't see from down
inside the hole so what's left to do
with this bit well first off the
concrete which goes down up to the
little boundary wall we've ped and
across the top of this rsj that's all
going to be done with a lighter grade
concrete and because it's so big it'd be
a victim of its own weight but we're not
going to cast that yet we're going to
wait till we finish doing the whole room
now then what is next Colin we need to
dig a bit more out but how much more
okay I hope this bit is going to clear
up a lot of the questions as to what
this project is all about where it's
going and where everything fits in so
the next dig we cannot dig a massive
hole as wide as what we've done before
because we've got the doorway and the
house to worry about if we undermine
this little door frame here and this
pillar here too much then we risk of
destabilizing that possibly having some
cracks forming the walls so we need to
dig up to about the side of the door
there and straight down but as well as
that we need to go a little bit deeper
as well now if I get my extra piece of
model
this is stage two so that is the next
bit of room that we need to for now
don't know if you noticed on all the
reinforcement that come down here and
everything there was all the bars
sticking out all the 400 mil bars we've
got that to build off so this bit is
going to be a lot easier cuz we're not
having to worry about where everything
is we're just extending the room now I
know what you're saying Colin why is it
going a little bit deeper well we've got
the car to worry about and how it gets
lifted in and out and where is that
happening that is happening here now get
the rest of the model I I can do this
that knock in the camera
this is the rest of the room it is going
to be big
[Music]
look at that this is the grand plan
people so the car will come up out the
floor here where's my DeLorean I've been
looking online for a bigger one can't
find one even the Playmobile one is the
same size as this the Lego one might be
fractionally bigger you will drive onto
the
drive this bit here will have a lift
mechanism and the whole thing will lower
down down into there and then I'm going
to have a turntable system so the whole
thing can turn around and then when it
compl back up again you'll be able to
drive off forward amazing we can all
agree that that is going to be the best
thing ever to happen to a three bed semi
detach now the reason why this bit has
to go deeper is because when this floor
lowers down obviously part of this L
mechanism has got to go into the floor
cuz I want the floor to remain
completely level I don't want you to
walk into the room and then the car be
up on a plen or anything like that I
want it all be level so that has got to
sink into the floor now the exact depth
of this I'm not totally sure yet but
I've got a rough idea it's probably
going to be the same distance as the
bottom of this horizontal bar to the
surface because when the floor comes up
this is kind of like a bit of a point
where we can't go past very easily with
the lift mechanism because that sticks
out past the wall of the actual roof and
it's the Turning of the car which is why
it has to get lower over here and not
just underneath the car cuz if you can
imagine like a massive circular disc
that's got to turn round that's got to
sink into the floor as well hence why
the floor is lower right over here and
right over here as this is the scale you
can see if I put the camera in here it's
going to be a big old room but this is
what we've got to do so there is a lot
of work ahead of me a lot of work but as
you can see it's going to be epic now
this hole here is just purely so you can
see through it but I have left another
hole over there because there's been so
many requests for you to still be able
to see the rock because obviously the
rock face wall we've got at the moment
does look pretty cool and when you come
around the corner and you see that it is
kind of impressive so I'm going to try
and leave that exposed I am worried it
is going to condensate up and it's
constantly be getting getting wet damp
on the other side of the glass not the
room side the other side now you can use
those systems that they use in
skyscrapers there like a magnet and a
squeegee that you could go around but if
it gets to that point I might make it so
if it doesn't work you can kind of
retrofill it in and go over it because I
don't think we want you know
condensation and stuff everywhere got
enough problems with that at a minute
that is the grand scheme of things which
will do this bit next just up to the
doorway and then this bit will probably
be done in another two
sections yes there is a lot of work for
me to do a lot of work but it's going to
be well worth the effort now before we
dig this next bit there's a little bit
of prep that we need to do outside
before we go digging out a load more
first up we need to do a little bit of
power weeding and pulling a tree up with
the JCB but fair not people I don't
believe in chucking trees away and it
has been replanted in the countryside
although I think the journey has took
its toll on it slightly fingers crossed
it pulls through then next up we set out
some supports to move the massive metal
thing we made originally that the van
was going to park on while we dug
underneath it then it's time to remove
the boundary Stone between me and my
neighbor's driveway which of course I
will be replacing afterwards to add some
tracking down now what this is is to
save the gardens being completely chewed
up by the JCB and Tom when he brings a
digger in for the second time this is a
sort of stuff that you get events that
you put down on like concerts and stuff
so this will keep the ground protected
while we drive all over it and then it
started raining again I'm like come on
wether Tom is ready with his
Digger okay we're all ready to dig some
more out now of course the next bit of
room is going to be 12200 mil it's going
to be that because that's the thickness
of a sheet of metal now this time we're
going to put the reinforcing mesh and
everything down first we'll put it up
the walls and everything before we even
start building the room and if you're
wondering well why didn't you do that
before Colin I've been doing the tunnel
for like two or 3 years and the methods
of which we used there are kind of
ingrained into my head and I just
continued it coming out here but of
course the tunnel is slightly different
it's a smaller room it's not so high the
concrete walls are if not just as thick
as what we're using here and what we
used there was fibrous Concrete where
you get like the polymers mixed into the
concrete and that's kind of like
reinforcement but within the concrete
now that is okay for the tunnel but out
here of course we need to be a little
bit more stronger because we've got cars
we've got all sorts you got the width
the height and everything all to
consider so we'll put the stuff in first
and then we'll build the room and then
we'll put the concrete around the sze
and everything afterwards but you don't
need to worry about that that's my
problem and if you have a look in here
look little milk and tea mugs they're
still available on the website thank you
very much to Barrett steel for supplying
all the steel for this I'm sort of
keeping a an eye on cost so at the end I
can give a a notice to how much this
cost if you want to try and guess how
much this whole thing is going to cost
by the time it's finished that's a good
thing to put in the comments and if
you've got any other questions questions
put them in as well because I'm going to
do a questions video on the second
Channel next because even though I've
done my best to explain what I can here
there's no doubt going to be things I've
missed or things that I've explained in
a slightly weird way which I think's
okay but you guys might not so they are
that is the project subscribe don't miss
any of this it's obviously going to take
a long time I want to try and get it
done this year but I'm going to have a
couple of weeks off it now because I'm
kind of after working for three or four
months on this thing I'm sick of the
sight of limestone so I'm just going to
go and do something quick and then I'm
going to come back on it and hopefully
the weather have improved as well cuz we
have had officially the wetest February
ever and boy do I know about it right
see you in the next
one I hope you like the model though all
those times it was raining and I
couldn't get on I was making this and it
kind of feels kind of retro is it to
have a model where everything now is
done on like computer simulations and
stuff this is
[Music]
cool
[Applause]
like mov
scenes I'm going to set myself
[Music]
fire
5.0 / 5 (0 votes)