How to prevent water leakage in underground valve chambers?
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How are the valve rooms and valve shafts of long-distance pipelines waterproofed?
Valve chambers are problems that cannot be completely solved no matter what. What is theoretically feasible simply does not work in practice. Moreover, it is advisable for underground spaces to be breathable. The valve chamber is above the outdoor ground level and the highest flood level; it requires a foundation, and the floor must be treated to be waterproof.
It is difficult to keep it above the floor level and flood levels, as cleaning the pipes would be very troublesome in that case. The western region is fine, but in Jiangsu, there is plenty of rainfall, which makes it easy for water to accumulate in the valve rooms; this problem is quite significant there.
It is very difficult to ensure that valve chambers are leak-free, and the valve chambers in our storage area present a similar challenge. We’ve tried various waterproofing methods, but with little success; in the end, we simply increased the level of maintenance as much as possible without disrupting production, by pumping out more water.
The OP’s question is a very troublesome one. All our valve chambers have been waterproofed in accordance with the specifications, but none of them is free of water. One can only do more maintenance on a regular basis.
Why not use a buried valve? This would also eliminate the need for a valve chamber.
For this kind of problem, I have a suggestion: build it a bit higher than the ground level, ensure better waterproofing, and conduct more frequent inspections.
Our station uses steel valve chambers, which are coated with epoxy coal tar pitch for corrosion protection, and the effect is quite good
I agree with what was said above; water accumulation is inevitable in valve chambers, so there’s no other choice but to have a water storage tank and pump out the water regularly. There really is no solution to this.
Our station uses steel valve chambers, and epoxy coal tar pitch is used for anti-corrosion treatment in these chambers; the results are quite good ~~~~~~~~~~~~~~~~ What do steel valve chambers look like? Are there any photos?
A hidden drainage channel is installed uniformly at the bottom of the valve chamber; this is how we do it in our company. During heavy rains, the drainage is a bit slower, but there’s no water accumulation under normal circumstances
Make it 100 mm above the ground level; regular maintenance will suffice