Diaphragm wall technology is a very important technology in civil engineering industry construction. This technology requires that the elastic modulus of concrete should not be greater than 1000MPa, while the slump should be kept between 18 1 ~ 2 19mm, the strength of concrete should reach 2 ~ 5 MPa within 28 days after pouring, and the impermeability coefficient should not be greater than 1 * 6544.
The concrete cutoff wall needs to be equipped with a construction platform first to ensure the smooth flow of concrete mixers, construction equipment and excavation equipment, and try to avoid setting a mud pool at the top of the dam to avoid affecting the pouring and transportation of concrete. After the layout of the construction platform is completed, it is necessary to build a guide groove. A temporary guide groove is set at the bottom of the civil building along the direction of the cutoff wall to ensure that the cement slurry can maintain the liquid level balance. Concrete with strength not lower than C20 shall be used on both sides of the guide groove, the clear height in the groove shall not be lower than 1800mm, and the top surface of the guide groove shall be higher than the construction plane100 mm..
After the pouring of the guide groove is completed, the wall protection treatment should be carried out in time to ensure that the guide groove reaches the expected shape and strength. Mud is generally used in retaining wall treatment, not only because the cutoff wall adopts concrete structure, but also because mud has the characteristics of good fluidity, high stability and first-class physical properties. In addition, mud can effectively improve the impermeability of concrete cutoff wall, and the recovered mud can be reused in the process of concrete pouring, which plays a very important role in reducing the engineering cost.
Before the concrete pouring of the cutoff wall, it is necessary to complete the installation of the lock pipe, the installation of the conduit, the pre-embedded curtain grouting pipe and the emptying of the slurry, and place the isolation ball in the conduit to ensure that the cement slurry does not contact the concrete during the pouring process. In the process of concrete pouring, the method of pouring in place at one time is generally adopted to squeeze the isolation ball and concrete out of the conduit together with mud. In the reinforcement installation project of concrete cutoff wall, it is necessary to install the reinforcement skeleton according to the plane shape of the cutoff wall, weld and position the embedded pipes in the reinforcement skeleton, and set a positioning reinforcement frame every 10m along the direction of the cutoff wall to ensure that the distance between the pipe hole and the bottom of the reinforcement frame is more than 2m.
Temperature control should also be paid attention to in concrete works of cutoff wall. The coarse and fine aggregate, water and cement of mixing concrete should be cooled before mixing. When commercial concrete comes into play, it is necessary to strictly check the quality inspection report and the test mixture ratio of coarse and fine aggregate, cement and water, and check the slump of concrete on site. Unqualified concrete will never be used. Before concrete pouring, the pouring scheme should be reasonably determined, and the vibrating quality should be guaranteed during pouring to avoid cold joints during construction. After concrete pouring is completed, it should be covered and maintained by water in time. Pull out the lock pipe within 12 hours after pouring. For the cutoff wall with a groove depth of more than 30m, the time for pulling out the concrete pipe should be controlled within 15 ~ 16 hours after concrete pouring, and the lock pipe with a depth of 30m can be pulled out after the initial setting of concrete (12h).
Application Analysis of Prestressed Anchoring Technology
Prestressed anchorage technology is widely used in the construction of civil engineering buildings, which not only greatly reduces the construction difficulty and ensures the construction quality, but also significantly improves the economic benefits. Prestressed anchorage technology can reinforce and reinforce high-rise buildings. In the construction of high-rise buildings in civil engineering, prestressed anchorage technology can effectively transfer the tensile stress originally acting on the components and reduce the tensile stress damage of the components. Prestressed anchorage technology is based on prestressed concrete technology, which uses high-strength steel strand bundles or prestressed anchor rods in concrete members to reinforce bedrock and buildings on it.
With the help of the latest GPS precise positioning technology, the prestressed anchor can accurately determine the anchoring position and adjust the anchoring depth and direction according to the design requirements and actual engineering geological conditions, which greatly improves the reliability of the prestressed anchor technology. By applying prestress to the original target under compression, the stress state of the component can be handled more perfectly and the possibility of damage to the component can be reduced. Although prestressed anchorage technology has many advantages and is widely used, it is still necessary to choose whether to use this technology reasonably according to the actual situation of the project site and control various technical parameters reasonably according to the stability and strength of the dam body in order to give full play to the anchoring advantages.
3 the development direction of construction technology
For the construction industry, on the one hand, it is necessary to scientifically analyze the development status and application of construction technology, and the construction technology should focus on the development of prestressed anchorage technology, concrete rolling technology, cutoff wall technology and environmental protection construction technology in civil engineering construction. With the increase of construction scale, the decoration structure of buildings is more complicated. Therefore, as technicians and managers of civil engineering, we should ensure environmental protection, reform and innovate automatic construction technology in the construction process, so as to effectively improve the modern construction mode of building construction technology.
On the other hand, as construction technicians, we should scientifically analyze the construction characteristics and nature of construction projects. According to the characteristics of deep-buried high-rise building foundation soil and the actual situation around the building, the foundation construction technology with low investment, high quality and high technology is continuously developed. As technicians, we should also pay attention to the development of prestressed anchorage technology, concrete rolling technology and cutoff wall technology, and develop scientific and advanced building technology in combination with the actual situation of the project.
4 conclusion
Civil engineering construction is the foundation of China's national economic development, and its engineering quality not only determines the enterprise interests of the contractors, but also relates to the economic development and social stability of the project site. Therefore, in the construction stage, which plays a decisive role in the quality of civil engineering, improving quality awareness and reasonably selecting construction technology are the fundamental guarantee of engineering quality. Because the construction technology of building engineering in China is not perfect, as civil engineering technicians, they should constantly accumulate experience in actual construction work and seek technical breakthroughs.
For more information about project/service/procurement bidding, and to improve the winning rate, please click on the bottom of official website Customer Service for free consultation:/#/? source=bdzd