In order to eliminate bubbles and compact the concrete, the basin should be upward rather than downward.
However, at present, most design institutes set the water stop steel plate in the post cast strip of the bottom plate with the opening downward, which is completely the wrong way to do the opposite.
2), the water stop steel plate of the floor also faces downward.
It is worth paying attention to the whole process of policy, planning, financing, design and construction, and the necessary skills for the abbot of the temple.
In the on-site construction diagram of post cast strip on the floor (Fig.
This not only can not eliminate the bubbles, but also makes it more difficult to discharge the bubbles, which leads to the non dense vibration of the concrete under the water stop steel plate and the formation of holes, which has essentially become a hidden point of water leakage.
The reason why the top and bottom Waterstops are installed in basin shape is to eliminate the quality hidden danger that the concrete at the lower part of the waterstop is not easy to be vibrated and compacted.
Fig.
According to article 5.1.10 of gb50108-2008 technical code for waterproofing of underground engineering, the construction of embedded waterstop shall comply with the following provisions: the waterstop shall be fixed, and the waterstop in the top and bottom plate shall be installed in a basin.
This problem should be highly valued by peers in the industry, especially the competent authorities in the industry.
Figure 2 installation diagram of water stop steel plate for post cast strip of a project in Tianjin “water stop steel plate should face the upstream surface” has become an industry standard.
During the construction of the main structure, the water stop steel plate is used as the water stop measure of the post cast strip, which is the most commonly used form in the project at present.
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However, during the implementation of the project, the installation direction of water stop steel plate is generally problematic because all parties involved in the construction do not have a thorough understanding of the specification, follow others and spread false information.
In this paper, the author of “Analysis on the correct installation direction of water stop steel plate of bottom plate post cast strip”, Zhang Xujiang and Zhang Jie, in view of the common practice of “the opening of water stop steel plate faces the upstream surface” in current construction projects, give reasonable questions and corrections according to the specification and theoretical analysis.
The copyright belongs to the original author and original source.
Relevant instructions and detailed rules should be issued to implement and solve it from the source.
1) clearly indicates that the water stop steel plate of the post cast strip of the bottom plate is downward.
There are also some technicians working on the front line who have doubts about the situation that the water stop steel plate faces downward, which makes it difficult for bubbles to be discharged during concrete pouring and holes are easy to occur.
The same is true of the cognition of the Design Institute, the construction unit, the supervision unit, the construction unit, the third-party engineering consulting company and the competent department.
However, the reason why the water stop steel plate is made into a basin type is clear in the specification.
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What should be the correct orientation of the water stop steel plate of the post cast strip of the bottom plate, and whether the opening direction is downward or upward? More than 95% of practitioners will say that the opening direction is downward.
In a Provincial Architectural Design and Research Institute, the node detail of the post cast strip method in the structural design description (Fig.
There is no saying that “the water stop steel plate should face the upstream surface” in the specifications inside and outside France.
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The corresponding provisions are interpreted as: the following problems often exist in the construction of middle buried waterstop: the concrete at the lower part of the top and bottom waterstop is not easy to be vibrated and compacted, and the bubbles are not easy to be discharged, and the shrinkage generated during concrete solidification is easy to make the gap between the waterstop and the concrete below, resulting in water leakage from the deformation joint.
Source: Luban union of construction engineering.
According to this situation, the article stipulates that the waterstop in the top and bottom plate shall be installed in a basin shape, which is helpful to eliminate the above disadvantages.
At present, in engineering practice, the opening direction of the water stop steel plate of the post cast strip of the bottom plate faces the water diversion surface (below), which is completely contrary to the original intention of the specification.
If the original copyright owner disagrees.
1 detailed drawing of a design institute on the practice of post cast strip on the floor of a project in Tianjin of a domestic real estate group.
Xiaobian very much agrees with this statement, which is also for the exchange and discussion of engineering colleagues.
