Analysis on the construction technology of precast concrete structure in building construction?

Nowadays, in order to further implement the requirements of "energy saving, emission reduction and green engineering" in housing construction projects, construction units must effectively apply the construction technology of assembled concrete structures. However, how to make full use of technical advantages in housing construction projects and avoid losses caused by immature technology application is a problem that all construction industries need to explore in depth at present. The following briefly introduces the technical advantages of precast concrete construction in building engineering:

1 technical advantages of prefabricated concrete building construction

1. 1 energy saving and emission reduction

Under the background of promoting "green building" in China, the construction technology of assembled concrete provides favorable conditions for it. Precast materials are usually used in precast concrete construction, which greatly avoids the waste of materials and resources during on-site construction, brings a new development model for rational utilization of energy in China, and reduces the impact of on-site construction on the surrounding environment. At the same time, the application of prefabricated building construction technology has also brought a lot of convenience to the surrounding residents, which is consistent with the goal of coordinated development of China's construction industry and social environment.

1.2 Shorten the construction period

In building engineering, the application of prefabricated concrete structure construction technology first needs to place all the applied red brick materials in the main exterior wall, which has the advantages of saving construction time and reducing investment compared with the traditional way of transporting and placing materials after the main building is capped. At the same time, when the main structure of the building is capped, the periphery is closed, which provides a lot of convenience for the later internal wall masonry construction and can shorten the construction period. If the traditional construction technology is applied, it is necessary to start the construction when the main structure is semi-capped, and assembling concrete can realize synchronous projects such as painting the external wall, which fundamentally improves the efficiency of capital operation and reduces the construction risk.

1.3 Reduce project cost

In addition, the application of construction technology of building precast concrete structure can also effectively save engineering cost. Assembled concrete members are generally completed in the factory, and only professional technicians are needed to guide the construction at the construction site. In addition, the main machinery used in the construction is lifting machinery, which greatly reduces the labor cost and labor cost, thus reducing the engineering cost. The prefabricated concrete construction technology can also reduce the occurrence of safety accidents and provide a guarantee for the healthy development of China's residential construction industry.

2. Analysis of key technologies of precast concrete structures in building construction.

The prefabricated concrete structures used in China's construction industry include infilled walls, shear walls, balconies, stairs and other construction forms, which will be suitable for different construction technologies. The following briefly analyzes several key construction technologies of assembled concrete structure in building construction.

2. 1NPC construction technology

The new technology of concrete prefabrication and assembly (NPC) is a brand-new technology in China, which mainly adopts the form of factory mechanized production and on-site assembly for building construction. The component applying NPC construction technology is mainly to effectively connect the concrete wall beam with the wallboard. When the vertical members are closely connected with the horizontal structure, steel bars are generally reserved on the vertical members to facilitate the overlapping work. In addition, the shear wall members in building construction are prefabricated members. The application of NPC construction technology can effectively reduce the workload and difficulty of external wall work, avoid the waste of building materials, and bring new opportunities for the development of green buildings. Finally, NPC construction technology can also effectively avoid cracks caused by different materials, thus ensuring closer and safer connection of components in different parts.

2.2PC construction technology

Precast prefabricated structure construction technology (PC) is also a new type of prefabricated concrete structure construction form, and its prefabricated components mainly include infilled walls, air conditioning panels and stairs. The application of PC construction technology in building construction can effectively connect different materials, reduce the connection gap, and make the materials of different materials stick together more closely, thus ensuring the thermal insulation function of concrete structure buildings. Prefabricated components are also completed in the factory, so the project also has the advantages of convenience and safety, and has little pollution to the environment. The biggest advantage of PC construction technology is that it can reduce the amount of construction work, including concrete pouring, maintenance and other processes, and reduce the construction time for concrete solidification to form the required strength.

3 key points of construction technology of assembled concrete structure

3. 1 Key points of precast wallboard construction technology

① Key points of concrete grouting technology: In building construction, when grouting is carried out by using the construction technology of assembled concrete structure, the grouting materials and mechanical equipment applied in the construction site should be defined first, and the materials are generally stirred by a blender. In the process of mixing, it is necessary to put various materials such as cement into the mixer and add a proper amount of water. After mixing, let it stand for a period of time before grouting construction. Grouting construction temperature should always be kept within the range of 5℃~40℃. Too low or too high construction temperature will affect the construction effect. Before the grouting works begin, the grouting materials shall be protected from sunlight. When the grouting material is initially set within 15 minutes, the remaining materials shall be used up in time. In addition, in the process of grouting, the surface of the component needs to be treated with water for cooling and wetting;

② Technical points of PC board installation: When installing PC board, temporary fixing clips must be fixed first. When PC board members enter the construction site, the PC board shall be placed on the stacking rack according to the PC board standard, and rings shall be reserved for hoisting. It should be noted here that when installing PC boards, the gaps between prefabricated boards should be carefully checked to keep the PC boards tightly connected. PC board can be corrected after splicing, and concrete pouring can be carried out after the correction is completed;

(3) Technical points of wall concrete pouring: Before wall concrete pouring, 3~5cm stone-reduced cement mortar should be poured at the bottom in advance to slow down the friction between concrete stones and prevent slurry leakage. After pouring with mortar, concrete can be poured. In general, the wall concrete pouring technology generally adopts layered pouring, the pouring height should be kept at about 40cm, and the pouring time interval should be kept within the initial setting time of concrete to avoid cracks.

4 abstract

At present, precast concrete construction technology is widely used in building construction, and the development trend of building engineering is gradually developing towards industrialized structure. In addition, the application of prefabricated concrete structure construction technology fully embodies the building requirements of "green environmental protection", effectively realizes the energy saving and emission reduction of construction projects, and the effective utilization of social resources makes the construction enterprises and social environment develop harmoniously.

I believe that after the above introduction, everyone has a certain understanding of the construction technology of assembled concrete structures in housing construction. Welcome to Zhong Da for more information.

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