engineering

Shaft (civil engineering)

Shaft (civil engineering) is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Shaft (civil engineering) rather than just read about it. In short: In civil engineering a shaft is a passageway that is either vertical or inclined more than 45 degrees. Shafts are often entered through a manhole and closed by a manhole cover.

Key takeaways

Shaft (civil engineering) belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Shaft (civil engineering) to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Shaft (civil engineering) from memory before moving on to harder problems.

Reference excerpt

In civil engineering a shaft is a passageway that is either vertical or inclined more than 45 degrees. Shafts are often entered through a manhole and closed by a manhole cover. They are constructed for a number of reasons including:

For the construction of a tunnel For ventilation of a tunnel or underground structure, aka ventilation shaft As a drop shaft for a sewerage or water tunnel For access to a tunnel or underground structure, also as an escape route

Construction There are a number of methods for the construction of shafts, the most significant being:

The use of sheet piles, diaphragm walls or bored piles to construct a square or rectangular braced shaft The use of segmental lining installed by underpinning or caisson sunk to form a circular shaft Incremental excavation with a shotcrete circular or elliptical lining Incremental excavation supported by shotcrete, rock bolts, cable anchors and steel sets or ribs Shafts can be sunk either dry or for methods such as the caisson method they can be sunk wet. Sinking a dry shaft means that any water that flows into the excavation is pumped out to leave no significant standing or flowing water in the base of the shaft. When wet sinking a shaft the shaft is allowed to flood and the muck is excavated out of the base of the shaft underwater using a grab on the end of a crane or similar excavation method. Because the shaft is flooded, the lining can not be constructed at the excavation level of the shaft so this method only suits methods where the lining is installed before shaft sinking (such as the use of sheet piles) or where the lining is sunk down with the shaft such as the caisson method.

References

Illustrations

Worked examples

Example 1 — a first encounter with Shaft (civil engineering)

Start with the simplest possible case. Write down what Shaft (civil engineering) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Shaft (civil engineering) before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Shaft (civil engineering) ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Shaft (civil engineering)

In research: Shaft (civil engineering) appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Shaft (civil engineering) in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Shaft (civil engineering) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Civil engineering, Tunnel construction, so understanding it makes those chapters shorter.
In everyday life: Look for Shaft (civil engineering) outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Shaft (civil engineering) in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Shaft (civil engineering) means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Shaft (civil engineering) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Shaft (civil engineering) in simple terms?

In civil engineering a shaft is a passageway that is either vertical or inclined more than 45 degrees. Shafts are often entered through a manhole and closed by a manhole cover.

Why does Shaft (civil engineering) matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Shaft (civil engineering)?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Shaft (civil engineering).