33 votes

What is the lowest point below sealevel that we have built where a human can go?

I assume you are asking the deepest structure of any sort that exists. Here is an infographic : Source : https://alansfactoryoutlet.com/the-deepest-underground-structures-in-the-world/ One mystery ...
user avatar
  • 7,656
18 votes
Accepted

How are passive houses made in very hot regions (like Saudi Arabia)?

A yahkchal is an example of a type of passively cooled building in Iran They utilise a combination of passive evaporative cooling and thick thermally insulating walls in order to keep the interior ...
user avatar
  • 1,168
17 votes
Accepted

What is the lowest point below sealevel that we have built where a human can go?

The Kidd Mine in Ontario, Canada: per the Wikipedia article, it is "the deepest accessible non-marine point on Earth" at "2,733 metres (8,967 ft) below sea level". I found this ...
user avatar
16 votes
Accepted

What is the term for diagonal bars which are making rectangular frame more rigid?

Braces. They come in a variety of shapes. K frames, X frames, eccentric frames, etc. . . . .
user avatar
  • 21k
15 votes

What is the lowest point below sealevel that we have built where a human can go?

If your volunteer is a very small person, maximum shoulder width of 23 cm/9 inches, then the answer is 12,262 metres (40,230 feet) deep in the Kola superdeep borehole in Russia. I can't find the &...
user avatar
  • 430
12 votes
Accepted

What's the purpose of these small closet-like-rooms-without-a-door?

I do not know, I've never been there and I have no other information other than what is in your question. However, ... I'd say that best guess, until somebody who knows more presents, is your ...
user avatar
9 votes

How are passive houses made in very hot regions (like Saudi Arabia)?

Insulation, shade, the use of low thermal conductivity materials and utilising any cool breeze at any time of the day are going to be key to passively cooling buildings in a hot climate. Different ...
user avatar
  • 9,527
7 votes
Accepted

Wood roof specs on engineering drawing

I am a practicing structural engineer with plenty of wood experience. That said, this is a bit of a tricky note because I believe it was probably written by an architect on a set of architectural ...
user avatar
6 votes

Why don't public transport networks have more routes to each terminal?

The main reason is economics. Who is going to pay for all the additional lines? The other part to this is, will the additional lines have enough passengers to make them profitable and sustainable? If ...
user avatar
  • 9,527
6 votes

Why don't public transport networks have more routes to each terminal?

Keep drawing combinations. You forgot Østerås to Vestli, Østerås to Bergkrystallen, and every other combination of possible origin and destination. This breaks down in a hurry. By the time you ...
user avatar
5 votes

Why did they build a sarcophagus over Chernobyl instead of pouring concrete over the building?

The likely reason is that simply pouring concrete over it would not have contained it. The site is smoldering and emits gases of various types. It also has voids and shifts around, various areas ...
user avatar
  • 1,615
5 votes
Accepted

How do I build a miniature concrete house?

Concrete isn't a good material for such a small model. I would suggest foamboard. You can get it at craft stores. If you can't find half inch thick material, laminate two layers of quarter inch board. ...
user avatar
  • 840
5 votes

How are passive houses made in very hot regions (like Saudi Arabia)?

Diurnal swings, i.e. temperature differences between day and night, are also an important consideration in hot climates. If the temperature at night drops to something acceptable, you can use night ...
user avatar
  • 377
5 votes
Accepted

What do they call that elegant triangular scaffolding often used in future-oriented architecture?

The general term for these structures in 3-d is a space frame. "Just making a triangle array" is a pretty good starting point, because three bars forming a triangle make a rigid structure without any ...
user avatar
  • 12.5k
4 votes

Light frame at tunnels and bridges

Such measures do exist, but they don't always prevent careless drivers from ignoring the measures and crashing into low bridges. One bridge that I know of has been hit at least 100 times and has been ...
user avatar
  • 9,527
4 votes

Are there standard terms that correspond to the anatomical axes, planes, and directions?

This answer comes from my experience in mechanical engineering, a structural engineer might have a different perspective. It is difficult to come up with a standard set of terms for planes or axes in ...
user avatar
4 votes
Accepted

Is the Louvre Pyramid oriented to the four cardinal points of the compass?

It doesn't appear so: (screen shot from google maps.)
user avatar
4 votes

How are passive houses made in very hot regions (like Saudi Arabia)?

Farther from the equator, a passive house is mainly a very well insulated house with good exposure to solar lighting for passive solar heating. However in hot climate, one has to rethink completely ...
user avatar
  • 631
4 votes

Foiling vortex traps around buildings

CFD I ran this situation through a couple of simple 2D CFD models. As you can see from the pictures below, one way to keep debris from gathering in this area is to increase the velocity of wind in ...
user avatar
  • 10.7k
4 votes

Why did they build a sarcophagus over Chernobyl instead of pouring concrete over the building?

The original sarcophagus built around 1986 has some issues and it was estimated in 1988 that it would only last 20-30 years (here we are). Check out this link that explains some of the main issues ...
user avatar
4 votes
Accepted

Carpet for noise reduction (tests / studies)

I have a background in acoustics, noise control and vibrations. I haven't done much in the way of residential applications though. Honestly, your best bet is to lay down heavy carpet with an ...
user avatar
  • 2,135
4 votes
Accepted

Natural ways for passively cooling/heating a home?

There are many ways that one can achieve natural cooling and heating. However, the best solutions are very dependent on the situation. Also, the problem with most of these solutions is that you'd need ...
user avatar
  • 22.7k
4 votes

What is the term for diagonal bars which are making rectangular frame more rigid?

The generic term is Bracing. You will often find it further qualified as Cross Bracing, Diagonal Bracing or Triangular Bracing, depending on the whim of the person doing it.
user avatar
  • 406
4 votes

What is the lowest point below sealevel that we have built where a human can go?

The point you are looking for is very likely located in a mine. You could check the list of deepest mines by depth below ground, and then find and subtract the surface elevation for each. (This still ...
user avatar
  • 141
3 votes
Accepted

What is a Tibetan Style Bridge?

The section on the precursor to modern suspension bridges, in the wikipedia article that you mentioned, talks about bridges of the "Tibetan saint and bridge-builder Thangtong Gyalpo" and points out ...
user avatar
  • 3,135
3 votes

Selectively rotating (engaging/disengaging) one of 80 couplings on a small shaft?

A mechanical solution using movable rods: Have 7 rods with pieces of rubber around them. The rods should be positioned so that you can move them leftwards or rightwards. When the rubber piece touches ...
user avatar
  • 1,835
3 votes

What are the limits on building very high buildings using certain materials and architectural style?

The tallest masonry building erected is the Philadelphia City Hall . It is 548 feet high. The issue with building masonry structures is the walls have to support the weight of the building and the ...
user avatar
  • 9,527
3 votes
Accepted

From the viewpoint of a civil engineer, what was the purpose of this bridge?

The location makes sense from a civil engineering perspective. The bridge has to span the river channel without being washed away during flooding events. A narrow, steep canyon works well for this ...
user avatar
  • 228
3 votes

Natural ways for passively cooling/heating a home?

In the middle east and specifically Iran they have used passive air conditioning for centuries. They build the neighborhoods with the houses tightly packed next to each other, reducing the exposure ...
user avatar
  • 21k
3 votes

Why did they move ancient Egyptian temples to prevent them from water damage instead of encircling them with a dam?

Shielding them by a dam would have been more costly. And being hidden under a 65 meters deep wall into the water of the Aswan dam would make them visually disappear, and lose their glory. As it is now ...
user avatar
  • 21k

Only top scored, non community-wiki answers of a minimum length are eligible