About Controversy! The opening direction of the water-stop steel plate is facing the water surface? Through analysis, it is concluded that the waterproof steel plate of the bottom plate should be open upward. However, some friends still pointed out that although there is a standard "Technical Code for Waterproofing of Underground Engineering" GB50108 provide a basis: "the waterstop in the roof and bottom plate should be installed in a basin", as well as the corresponding article explanation, but because there is no "opening up" word, we still have disputes in design, change or construction.
The bottom plate waterproof steel plate is opened upward
In view of this, the editor consulted a large number of specifications and atlases, and finally found a basis for clearly indicating and drawing the "opening up" in a certain authoritative technical standard. Article 6.1.5 DB11T1200 of the Beijing landmark "Technical Regulations for the Jumping Method of Super-large Volume Concrete Structures" emphasizes that the waterproof steel plate of the bottom plate must be upturned in the form of schematic diagram and text description:
"Technical Regulations for Jumping Warehouse Method for Super-large Volume Concrete Structures" DB11T1200
The schematic diagram of the Beijing landmark is a legend interpretation of the GB50108 provisions of the national standard "Technical Code for Waterproofing of Underground Engineering":
The "Technical Code for Waterproofing of Underground Engineering" GB50108
Although, as we discussed in the Controversy! The opening direction of the water-stop steel plate is facing the water surface? In the article, the reason for the "opening upward" of the waterproof steel plate of the bottom plate has been analyzed from the normative provisions and the principle of water stopping: the water-stopping principle of the waterproof steel plate is mainly to increase the seepage distance of water, and the opening direction has little effect, and the opening is upward to facilitate the discharge of bubbles when the concrete is vibrating.
However, in line with the attitude of "it is better to believe in books than to have no books", combined with the two questions raised by friends, we continue to discuss in depth:
1. The saying "opening the mouth towards the water" has been around for a long time, what is it?
We did not find a statement about "opening facing the water surface" in the relevant authoritative specifications, but in the atlas "Underground Building Waterproof Structure" 10J301, we saw a statement about the "water front", but only for the exterior wall construction joints, not for the roof. The saying "the opening faces the water" is probably also derived from this atlas, which causes the inertia of "the bottom plate is facing down, the roof is facing up, and the wall is facing outward" in the implementation of the project.
《地下建筑防水构造》10J301
Second, since the opening direction has little effect on the water stop, why fold the edge?
The vast majority of friends believe that the practice of folding the water-stopping steel plate should be to cater to the provisions of the standard "basin". The main reason for the folding of the waterproof steel plate is: to improve the rigidity of the steel plate and facilitate construction.
Hemming is to improve rigidity
To sum up, there should be no big controversy about the issue of "the opening of the waterproof steel plate of the bottom plate is upward".
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