Construction Precast Development
Precast News From China
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In order to standardize the pouring construction process of precast concrete beams (box beams, T-beams, hollow slab beams) for highway bridges, clarify the quality control points and standards of each process, ensure the internal quality (strength, elastic modulus, durability), appearance quality (uniform color, smooth surface, straight lines), and safe and controllable prestressing tension of precast concrete beams, this guidebook is specially formulated.
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[Abstract] This article analyzes the reasons for disputes between commodity concrete enterprises and construction units, such as volume, strength, cracks, color difference, etc.
, and proposes preventive and control measures.
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The artificial sand and gravel processing system has developed rapidly in recent years, with significant advances in sand and gravel processing equipment and technology.
Due to the depletion of natural sand and gravel resources, various regions have increased their efforts to protect the environment.
Artificial sand and gravel have replaced natural sand and gravel, leading to a significant increase in their usage and a trend of gradually replacing natural sand and gravel aggregates.
Through engineering examples, the influence of aggregate characteristics on engineering in artificial sand and gravel systems was analyzed.
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The 5000 housing project in Libya is located in Misrata, Libya, 200km away from the capital city of Tripoli.
Libya is a country that lacks fresh water and has a lot of fine sand.
It is adjacent to the Mediterranean Sea in the north and the vast Sahara Desert in the south, with a subtropical Mediterranean climate.
Climate characteristics: Warm and rainy in winter, hot and dry in summer; The average temperature in January is 12 ℃, and the average temperature in August is 26oC.
In summer, it is often affected by dry and hot winds from the southern Sahara Desert, and the temperature can reach over 50 ℃; The annual average precipitation is 100-600mm, mostly concentrated in winter.
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According to the industry standard “Construction Code for Building Engineering” JGJ104-97 in China, the construction process where the daily average outdoor temperature remains below 5 ° C for 5 consecutive days is called winter construction.
When the project enters the winter construction stage, corresponding winter construction measures should be taken for concrete pavement engineering.
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Concrete, as the core material of construction engineering, has a direct impact on structural safety and durability in terms of its strength.
The maintenance temperature becomes a key factor in regulating the strength development by affecting the cement hydration process.
In practical engineering, unexpected fluctuations in concrete strength often occur at different environmental temperatures, leading to potential quality hazards in the project.
Clarifying the correlation between maintenance temperature and strength development, revealing the influencing mechanism, and formulating optimization strategies are of great significance for improving engineering quality, which is also the core purpose of conducting relevant research.
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During the construction phase, the early concrete strength was low, and the formwork and steel bars were stacked on the beams and slabs too early, causing deformation and cracking due to the load.
When the concrete strength is low, removing the formwork too early can cause cracks due to the self gravity of the structure.
Therefore, during the construction process, it is not advisable to stack steel bars and formwork for loading too early.
The dismantling of concrete structures shall be strictly carried out in accordance with relevant standards to avoid severe cracks in concrete beams and slabs caused by premature dismantling, impact on young concrete, and insufficient steel reinforcement protection layer.
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Concrete drainage pipes are widely used in our daily lives, mainly for drainage and sewage treatment in urban areas.
Therefore, the installation and construction of concrete drainage pipes are particularly important.
So what is the installation and construction of concrete drainage pipes like? The installation process of concrete drainage pipes is relatively strict, and sufficient preparation must be made before construction.
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Recently, a friend shared that the article they wrote is relatively simple, mainly because the target audience is mainly frontline production management personnel.
I will try my best to go a little deeper and hope that colleagues can correct me.
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This article provides a comprehensive analysis of precast concrete buildings, first introducing their narrow and broad definitions, mentioning core features such as standardization and scaling, as well as the development process from traditional to new technology systems in China.
It elaborates on mainstream structural systems such as precast frames and shear walls, as well as various types of precast components.
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