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Two kinds of construction joints of steel mesh foundation slab with post pouring belt of building closure net

  • 20-04-15:57 Author
The leakage of underground structures such as foundation slab construction joints is a common quality problem in construction. On the one hand, the construction joint garbage is not cleaned up, which makes the concrete combination of two times is not dense; the vibration is not dense during pouring, resulting in hole cracks; the maintenance is not timely, and the temperature difference stress leads to local cracking of construction joints. On the other hand, the construction technology defects of water stop steel plate itself lead to poor construction quality of construction joints and leakage. Through the inspection of the construction joints of the floor in the past projects, it is found that the construction process defects of the water stop steel plate are different degrees; the vibration is not dense and the vibration is missing; the garbage is not cleaned up; the construction joint treatment method is not in accordance with the jumping warehouse method, which causes the construction quality hidden danger.
 Building closure network
 
   Post cast steel wire mesh Construction process steps and details:
 
Because the basement floor adopts the skip warehouse method, the post pouring band is cancelled, and only the construction joint is reserved for one-time pouring. The above figure shows the detailed node design of the construction joint of the skip warehouse. The construction steps are as follows: installing double-layer bidirectional bottom reinforcement at the bottom of the base plate → installing the lower φ 12 temperature reinforcing bar → installing the water stop steel plate, welding and fixing → installing the double-layer bidirectional reinforcement on the upper part of the bottom plate → installing the upper φ 12 temperature Stiffeners. The details are shown in the above figure; and the site investigation problems are easy to be found in the construction of water stop steel plate.
 
According to the construction defects of water stop steel plate, the improvement ideas are determined
 
The steel bar framework is directly welded with φ 10 on the top and bottom of the water stop steel plate, and the steel wire mesh is bound. Through calculation, the thickness of the bottom plate protective layer, the diameter of the bottom plate reinforcement and temperature steel bar are removed. The height of the upper and lower framework is 13.4cm, and the support spacing is 300. During installation, it is welded to the upper and lower reinforcement of the bottom plate.
 
The one-time molding can completely control the requirements of the middle setting of the water stop steel plate, ensure the thickness requirements of the protective layer, intercept the fresh concrete, and play a supporting role.
 
Expected construction effect after improvement:
 Steel wire mesh of post pouring belt for building closure net
 
It is expected that half of the water stop steel plate will be embedded in the concrete, and half of the steel plate will be exposed; there will be no large amount of concrete seepage, which will save concrete, reduce the amount of chiseling, and facilitate the cleaning of construction joints, and the construction joint joints are better.
 
In addition, some sections of the project plan to adopt the fast and easy to close network, and has made a comprehensive analysis and local field test.
 
It is a new type of building material with strong resistance to tension and free modeling. Its thickness is 0.35mm and width is 450mm. It is pressed by thin hot-dip galvanized steel plate. The steel mesh surface is stamped to form a neat grid. There are protruding dental plates on the grid, which can make up for the bonding quality between the quick and easy closing mesh and concrete to a certain extent.
 
Step 1: manufacturing and processing
 
The framework of the steel mesh is welded with φ 10 steel bars. Since the length of each raw material of the water stop steel plate is about 3000mm, the skeleton length is made according to this length minus 50 ~ 60mm (the water stop steel plate is overlapped by 50mm). One section of the framework is made as an opening and the other section is sealed. See Fig. 1 for details. After the fabrication, it is vertically and centrally welded at the bottom and back of the water stop steel plate, and the steel mesh is bound. See Fig. 2 for details.
 
Skeleton making
 
Skeleton welding
 
Step 2: field installation
 
During the field installation, after the lower reinforcement and temperature reinforcement of the bottom plate are installed, the prepared water stop steel plate is placed according to the setting out position, and then the water stop steel plates are welded together, and the short section steel bars are welded on the bottom plate steel bars for proper fixation, then the upper steel bars and temperature bars of the bottom plate can be bound and formed at one time.
 
Straight line installation
 
Corner mounting
 
  Post cast steel wire mesh
 
   Building closure network technology
 
Step 1: manufacturing and processing
 
The steel wire mesh is easy to be manufactured and manufactured as the steel wire mesh, which can be used as the framework of the steel wire mesh.
 
Steel framework welding, support pole spacing increased
 
Width control of steel frame
 
Binding fast and easy closing net
 
Finished product effect
 
Step 2: field installation
 
According to the wire mesh process ideas.
 
Finished product effect of on-site water stop steel plate quick and easy to close net construction
 
Analysis and comparison of construction effect
 
Comparison of field installation effect
 
Check and compare the quick and easy closing mesh and steel wire mesh installed on site
 
  1、 Building closure network One side is facing the fresh concrete, and the supporting frame surface is poured backward with concrete, which meets the requirements, and is the same as the steel mesh construction method;
 
2. Although it has greater impact shear resistance than steel wire mesh, its flexibility is worse than that of steel wire mesh. If it is bound on site, the construction quality cannot be guaranteed and it is not easy to bind. Moreover, it must be bound firmly with the framework, and the cost is higher than that of steel wire mesh;
 
3. Due to its thickness of 0.35mm, which is thicker than the steel wire mesh, it becomes an isolation surface, which has a certain impact on the combination of the concrete poured twice at the construction joint.
 
Comparison of forming effect of construction joint on site
 
The inspection and comparison of the quick and easy closing mesh and steel wire mesh after pouring on site are carried out
 
1. In terms of appearance quality, the cement slurry of quick and easy closing mesh is less than that of steel wire mesh, and the construction interface is relatively fresh;
 
2. The water stop steel plate is in the middle, half of which is embedded in the fresh concrete, and the other half is exposed. Both of them can achieve the expected effect;
 
3. Due to the coverage of concrete vibrator is 350 ~ 500mm, specific requirements are made for the team during the construction. During the vibration process, the distance from the steel wire mesh and the quick closing mesh is 450mm. The pouring results show that both of them are only partially convex, which meets the quality requirements.