4 ms·
Not all of them. Sometimes they are waste products of some other industry. Eg old mines / quarries.
by adiusmus 8y ago
Not all of them. Sometimes they are waste products of some other industry. Eg old mines / quarries.
- CydeWeys 8y agoYes, you could use a pre-existing big hole, and carry concrete blocks from the bottom of the hole to the top of the hole. All you're really doing with this approach is swapping out the tower crane for a gantry crane though, for negligible savings. The hole's not really helping you out that much.
- pas 8y agoHard to scale them though. And they are not uniform/standardized.