(One Hundred Questions on Waterproofing) #82: What parts of ordinary storage tanks are prone to leakage? What are the two main methods for constructing the tank structure? Which method is less likely to cause leakage?

Answer:

(1) The parts that are prone to water leakage in general water storage tanks are:

1. The secondary structural joints (that is, the construction seam where the large base and wall structures are poured twice).
2. Drainage pipes and inlet pipes, along the fire pipes.
3. The wall structure is leaking due to honeycomb or cracks.
4. The bottom is cracked due to excessive slackening of the ties or improper binding, resulting in leakage at the base beam and the eaves.

(ii) There are two construction methods: the U-shaped structure and the M-shaped structure. The U-shaped structure has the advantage of no secondary construction seams, which means it is less likely to leak water. However, this method is more labor-intensive during installation of membrane and bracing. It is therefore less common on construction sites. Therefore, the waterproofing issue becomes particularly important.