Cast in place structural problems, urgent, concrete pouring problems and treatment

In view of your situation, I think there are hidden dangers and problems to pay attention to as follows:

1. Legal aspect: According to the provisions of the "Administrative Measures for Residential Interior Decoration", if there is no legal procedure for your addition, you will bear legal responsibility once someone reports it.

2. Property management: For additions that have not obtained legal procedures, usually the property is not supported, of course, it is impossible to actively cooperate, and it is possible to order you to demolish within a time limit.

3. Seismic measures: You should set up two structural columns at two corners, and set up a beam belt (ring beam) at the top to connect the structural column with the beam belt, and set up 2 or 3 tie ribs on the wall, the purpose is to strengthen the integrity and achieve seismic resistance.

4. Because you are a terrace, it should not be a cantilevered plate structure, so it is recommended to try to make the central axis of the new masonry wall correspond to the central axis of the corresponding wall downstairs, and the purpose of this is also considered from the perspective of earthquake resistance.

5. Waterproofing: Because your purpose is the bathroom, you must do a good job of waterproofing, not only the ground, but also the height of the wall within the range.

I'm a structural designer.

First of all, it is not advisable for you to add to the structure by yourself, remodeling, etc., which will definitely have a negative impact on the structure.

I basically understand your thoughts, whether your roof is cast-in-situ, the roof should be cast in situ as much as possible to make a ring beam on the top of the wall to increase the integrity, because you are in the 6-degree zone, ** the problem is not prominent, and another point is that if your additional structure collapses, there is no possibility of falling from the 5th floor, if there is, you can use light steel color plate wall (or other lightweight structure). The hidden dangers of your structure mainly exist in the following aspects:

1. The addition of toilets with pipes, etc., will cause some damage to the original structure;

2. The self-importance of the additional structure is borne by the floor or roof below, and this part of the load is not considered in the design of the floor or roof.

3. In case of disturbances such as **, the additional structure may be disconnected from the main structure or try to be disconnected.

4. If you have a property company, the property will definitely prevent you from doing so.

5. If in case, I mean, if your addition affects or causes harm to other residents, you may be held legally liable.

That's all that comes to mind. Oh, and it's better to consult a professional or ask him to show you the spot.

When preparing fluidized concrete, if the cohesion and water retention of concrete are broken, the concrete will be under the action of its own gravity and other external forces.

Separation is generated, i.e., segregation. If the mixed water precipitates out of the surface, it is water secretion. Usually, water secretion is a prelude to segregation, and segregation is inevitable.

This leads to delamination and increases the likelihood of blockage of the pump.

A small amount of water leakage is allowed in the project and is beneficial to prevent cracks on the concrete surface.

Causes and countermeasures of water leakage and segregation of concrete:

1) The sand rate is low or the content of fine particles in the sand is small, so that the water retention of the concrete is low, and the slurry settlement is easy to produce slurry settlement due to the large mud content of the sand, that is, "grasping the bottom". Improve the sand rate, reduce the mud content in the sand, and a reasonable sand rate can ensure the workability and strength of concrete.

2) The total amount of cementitious material is small, the volume of slurry is less than 300L m3, and fly ash is added, especially the large flow with low strength grade.

For dynamic concrete, the content of fly ash should be appropriately increased, so as to improve its water retention.

3) The stone grade is poorly matched or is a single particle size stone. Adjust the gradation of stones, and the sand rate should be increased for stones with a single particle size.

4) The water consumption is large, so that the cohesion of the concrete mixture is reduced. Improve the water reduction rate of admixtures or increase the amount of admixtures, and reduce the use. Water.

Summary. Hello, I have seen your question and am sorting out the answer, please wait a while Analyze the reasons for the collapse of cast-in-place concrete floor slabs during pouring.

Hello, I have seen your question and am sorting out the answer, please wait a while Analyze the reasons for the collapse of cast-in-place concrete floor slabs during pouring.

1.uneven settlement of buildings; 2.temperature shrinkage cracks; 3.

Cracks caused by materials or construction and design reasons (such as large amount of concrete fly ash and mineral powder; The spacing of the reinforcing bars is too thin; The position of the negative moment rib is wrong; unqualified raw materials for steel bars, etc.). Therefore, if the raw materials of the steel bars do not meet the standards, the concrete strength does not meet the design requirements, etc.; Collapse is possible under increased load.