Practice log of construction site! !

first, this is my first internship in my life, and it is so unforgettable. It will comprehensively test my abilities in all aspects: study, life, psychology, body, thought, etc., and test whether I can apply the theoretical knowledge I have learned to practice. It is related to whether I can successfully stand in this challenging society in the future, and it is also the key to building my confidence, so my investment in it is also 1%! A full week of internship is over, and I still have a lot of gains during this week. It is necessary to sum up after the internship.

through a week's internship, we visited the construction sites of several communities (Shangzuo, Oriental Garden, etc.) and went to Tangshan Ring Expressway. Here, I was deeply impressed by the exquisite layout of Shangzuo, the individual design of Oriental Garden and the perfect shape of the expressway overpass.

Through practice, I have learned a lot of practical knowledge. The so-called practice is the only criterion to test the truth. Through standing by, I have closely observed the whole building construction process, so that I can meet with the builders face to face, see how they construct and how to turn the model on the drawings into beautiful buildings, and learn a lot of practical and specific construction knowledge, which is often something I seldom touch and pay attention to at school, but it is also very important basic knowledge.

that day, we stepped on a ladder made of steel pipes and iron nets, and we began to feel very dangerous. There were steel pipes or iron bars sticking out all around. The formwork and supports on the second and third floors have been removed, and we can clearly see that the pillars supporting the upper weight are so big that we all feel that the height of the floor is smaller. There are many constructional columns around the load-bearing columns, which are used to increase the strength of the wall to avoid easy collapse due to the long wall body. Along the way, we saw that the supports of the above floors have not been dismantled. These supports are made of steel pipes and templates. The steel pipes are very dense, so it is obvious that it takes a lot of support to bear the concrete slabs and beams with no strength at all.

in the building, I found many cracks at the junction of some buildings. After the teacher's explanation and the information I collected, I gained a lot.

The causes and treatment of cracks in concrete is a very complicated problem, so let me talk about my opinion: The causes of cracks in concrete are various, mainly the changes of temperature and humidity, brittleness and unevenness of concrete, unreasonable structure, unqualified raw materials (such as alkali-aggregate reaction), formwork deformation, uneven settlement of foundation, etc. During the hardening of concrete, the cement releases a lot of hydration heat, and the internal temperature rises continuously, causing tensile stress on the surface. In the later cooling process, due to the constraints of foundation or old concrete, tensile stress will appear inside the concrete. The decrease of air temperature will also cause great tensile stress on the concrete surface. When these tensile stresses exceed the crack resistance of concrete, cracks will appear. The internal humidity of many concrete changes little or slowly, but the surface humidity may change greatly or dramatically. Such as poor maintenance, sometimes dry and sometimes wet, the surface shrinkage deformation is constrained by internal concrete, and often leads to cracks. Concrete is a brittle material, and its tensile strength is about 1/1 of its compressive strength. The ultimate tensile deformation under short-term loading is only (.6 ~ 1.) × 14, and the ultimate tensile deformation under long-term loading is only (1.2 ~ 2.) × 14. Due to uneven raw materials, unstable water-cement ratio and segregation during transportation and pouring, its tensile strength in the same piece of concrete. In reinforced concrete, tensile stress is mainly borne by steel bars, while concrete only bears compressive stress. If there is tensile stress in the edge of plain concrete or reinforced concrete, it must be borne by the concrete itself. In general design, no tensile stress or only a small tensile stress is required. However, the cooling of concrete from the highest temperature to the stable temperature during operation often causes considerable tensile stress inside the concrete. Sometimes the temperature stress can exceed the stress caused by other external loads, so it is very important to master the variation law of temperature stress for reasonable structural design and construction.