To effectively improve the quality of the building itself, it is necessary to take reasonable concrete materials in the implementation of the building construction process, which has led to a great increase in the importance of concrete in the construction industry now. Together with the fact that the optimization of the concrete structure used in the construction industry has now become a necessary means of maintaining the stability of the building, this requires the adoption of reasonable methods to enhance the quality of the building surface.
In the process of implementing concrete construction, fair-faced concrete plays a very important role in the overall concrete construction. It is necessary to consider not only the condition of the building itself, but also the energy efficiency and environmental protection of the building construction. And in the in-depth study of fair-faced concrete, it is found that this concrete itself has certain construction advantages, which requires in-depth study of fair-faced concrete to ensure that its application in the construction industry has a certain expansion.
1 Clearwater concrete formwork construction analysis
In the process of trying construction projects, in order to fully improve the quality of the building itself, it is necessary to conduct in-depth research on construction materials to ensure that the corresponding quality can meet the needs of social development. The use of fair-faced concrete in the construction of buildings has made this building material widely used in the process of building construction because of its ability to effectively solve the problem of frame construction cost in the construction of buildings.
However, in an in-depth study of fair-faced concrete, it was found that there are still some problems in the process of its use, which are mainly manifested in the fact that its own quality cannot be reasonably guaranteed. The main reason is that fair-faced concrete does not need to be decorated and framed in the process of pouring, which often leads to the problem of angularity when finishing the pour. Therefore, it is necessary to pay high attention to the quality of the whole formwork when carrying out the construction of fair-faced concrete, so that fair-faced concrete can be more widely used in the construction of buildings in China.
1.1 Analysis of formwork construction
For fair-faced concrete, mainly includes in the process of construction of the building used once the type of concrete, and in the process of construction does not require a second treatment and the corresponding decoration, greatly reducing the work procedures in the construction of concrete, to reduce the construction time to play a very important role. Clear concrete has its own angular characteristics, which makes the process of concrete manufacturing very simple.
1.2 Principle of fair-faced concrete formwork construction
To ensure that fair-faced concrete plays its best role in the construction of buildings, it is necessary to have a comprehensive understanding of the overall state of the building during construction, and in this process, it is also necessary to analyze the structural state of fair-faced concrete itself to ensure that it can be fully integrated with the construction of buildings. The formwork construction also requires effective accounting of the formwork form to ensure the accuracy of the formwork construction. After the construction is completed, the formwork should be effectively reinforced to achieve the purpose of enhancing the stability of the building itself.
2 Clearwater concrete formwork construction points
To ensure that fair-faced concrete can be used to its fullest potential in the construction of a building, it is necessary to give full consideration to the technical methods chosen during the construction process. A comprehensive study of the overall structure of the building is also needed before construction to ensure the accuracy of the construction.
In-depth analysis of fair-faced concrete shows that there are some differences between it and traditional concrete, so it is necessary to analyze the steps and other properties of fair-faced concrete in order to ensure the smoothness of concrete laying. In addition, it is necessary to analyze the load-bearing capacity of fair-faced concrete formwork in the actual construction process, so that the construction of fair-faced concrete can be carried out more smoothly.
2.1 Construction attention measures
2.1.1 Positioning measures.
Before assembling the column and wall formwork, according to the column and wall border line popped out on the floor, 150mm from the ground in the vertical reinforcement welded 12mm-16mm diameter bars as positioning bars.
2.1.2 Anti-overturning measures.
In the column, wall formwork height of the upper, middle and lower three (not more than @ 1500mm) set up three diagonal brace, using the ground when pouring ะค48 steel pipe fixed points, as a template anti-overturning measures.
2.1.3 Anti-joint misalignment measures.
Outside the mouth of the column, wall and pipe wells, elevator shaft wall connected to the upper and lower joints, in order to prevent joints, hew misalignment, formwork lengthening downward hanging 60mm, every 200mm open 20mm wide slot, using 12mm diameter bolt head bent into a round hook, hooked in the column, the wall on the inside of the vertical reinforcement, bolt tightening to ensure that the upper and lower hew smooth without stack marks.
2.2 Protection measures of the formwork
2.2.1 Protection measures of reinforcing steel project on the template:
in the process of rebar sampling, it is necessary to ensure the accuracy of the sampling, as well as the accuracy of the processing size, during the transportation of this type of semi-finished products, sack lines and wooden boards should be used to play the effect of pad protection, to avoid the maximum direct dragging of reinforcing steel on the template.
During the rebar bundling, the corresponding wall and column rebar must be corrected by means of a drop hammer, and after correction, the rebar should be spot-welded directly to the beam rebar points to ensure the accuracy of the rebar itself; if there is a redundant part in the process of rebar placement, then the redundant member should be bent inward directly to avoid the possibility of exposure after the construction is completed. Exposure will lead to the phenomenon of rust spots, which will affect the quality of the reinforcement and the aesthetics of the surface.
2.2.2 Installation of pre-buried protection measures for the formwork:
it is important to coordinate all aspects of the installation of plumbing and electrical engineering to avoid the phenomenon of openings in the formwork, as far as possible, the pipeline concealed buried treatment; pre-buried pipe welding operations must be protected with thin iron or wet sacks underneath the welding, to ensure that the welding slag does not splash down on the formwork, so as not to affect the quality of the appearance of the concrete forming.
2.3 Removal of formwork and maintenance of formwork
2.3.1 Acceptance requirements before formwork dismantling:
Based on the compressive strength parameters of concrete specimens cured under exactly the same conditions, the appropriate dismantling of the formwork is determined. For example, some of the side forms without load-bearing effect can be removed directly when the strength of the concrete itself has reached 25%.
In this way, we can ensure that the structure will not be deformed after demoulding, and maintain the integrity of the angles; concrete load-bearing slabs within the span range of 2m can be removed if their strength reaches 50% of the expected design strength; beams and slabs in the span range of 2m-8m need about 75% of the design strength before they can be demolished; beams and slabs above 8m need to be demolished if their strength reaches 25% of the expected design strength. The load-bearing structures above 8m must reach 100% of the design strength before they can be demolished. Different demolition standards are mainly based on the load-bearing importance of the components themselves to be divided.
2.3.2 Strictly control the demolition time:
the demolition time should be determined according to the strength of concrete specimens, combined with the structural members of different parts for calculation to determine the demolition time and program. For example: for column wall mold, after 24h of concrete casting, the mold should be demolished only when its own strength can ensure that the members are not deformed and the angles are intact; the side mold of clear concrete structure should be demolished after 48h, etc.
Conclusion
In summary, it can be seen that, in the process of continuous development of the construction industry, the application of fair-faced concrete plays a very important role in improving the quality and beauty of the building itself. In the process of taking fair-faced concrete for construction, it is also necessary to have a comprehensive understanding of the overall structure of the building and the corresponding parameters of the concrete, so as to make the fair-faced concrete more widely used in building construction.