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2023-01-09There are various construction techniques for building roofs, and the effects presented by different construction methods also have certain differences. Installation technology, the application of this technology can make the roof reach the best state in terms of overall performance, so it is quite favored by construction personnel, but in the process of construction, it is inevitable that there will be some potential risks, as long as the construction The personnel strictly follow the specific construction process to install, I believe it can be effectively avoided.
1 Project Overview
This paper mainly takes the construction of a construction project as an example and elaborates on the construction points of the steel space frame structure in detail. The construction project is mainly used as a shopping mall. It has a two-story structure and the longitudinal span of the column reaches 12m. In the process of building the roof of the building, it was decided to adopt the structure of the steel space frame. The overall area is more than 5200m². The building is in the shape of a quadrangular pyramid. During the construction process, the roof construction of the steel space frame structure is a construction project that is carried out after the main project is prepared, that is after the other columns are transported to the construction site. In order to ensure the completion of the project within the specified construction period and ensure the construction quality of the project, the space frame members and other construction materials shall be transported twice, and all the members shall be transported to the roof by means of a lift.
2 Construction and installation technology of building roof steel space frame engineering
2.1 Space frame production
Because of the particularity of this project, the structure of bolted ball steel space frame is used in the construction of the roof. Most of the components in this link are completed by mechanized equipment during the construction process because the project consumes zero There are many parts, the use of large-scale production can effectively save time, can meet the number of parts required in the construction, and analyze from the quality, the use of machining can effectively reduce the defects in production and improve the quality of parts. Quality also lays a good foundation for the construction quality of the project and effectively controls the potential errors in the construction project within a limited range.
2.2 Paint brushing
After the production of the space frame is completed, a layer of paint should be painted on its surface. Before the paint is painted, the rust on the surface should be cleaned up to meet the specified requirements, and at the same time, in order to prevent the steel space frame from being rusted again. For erosion, two layers of anti-rust primer should be painted on the surface first so that the paint can achieve the ideal painting effect and achieve the standards required by engineering construction. During the welding process of the space frame, 5cm should be preset on both sides. After the overall welding process is completed, the pre-set 5cm should be painted to ensure that it is in a dry environment. On the one hand, it can air-dry the paint as soon as possible. On the other hand, it also prevents the steel space frame from being corroded again in a humid environment, which affects the actual use. Therefore, the temperature of the storage steel space frame should be controlled above 5 °C, and the relative humidity standard should not exceed 85%. In the process of painting, in order not to cause unevenness on the surface, the required parameters For painting, in order to achieve the ideal construction effect, the steel mesh frame treatment process in this link is a link between the previous and the next. Therefore, the relevant staff must pay attention and successfully complete the painting of the steel mesh frame.
2.3 Space frame installation
For the installation of the space frame, considering various factors such as the environment and construction materials, it was finally decided to use the method of full scaffolding for installation. During the installation process, an installation platform was built in advance, and the steel space frame was carried out on the installation platform. The principle of connecting the rods is used to gradually form the scattered steel space frames into a unified whole. This installation process effectively reduces the difficulty in construction and does not cause deformation of the components. In addition, the steel space frames During the installation process, it is necessary to pay attention to the safety of the construction personnel at all times to ensure the smooth completion of the installation of the building roof.
The specific construction process mainly includes three links. The first is the pre-embedding of the foundation components. In this construction process, it is necessary to reasonably cooperate with civil engineering. On the concrete steel bars, the pre-embedded components are fixed on the upper part, and Strictly determine some important data such as elevation according to the requirements in the construction to meet the requirements of the project construction. After the pre-embedding is completed, it is necessary to further check the relevant size problems, and control the error within 15mm. When the steel space frame is constructed, special personnel shall supervise the construction to ensure the quality of the project. After the pouring is completed, use the level to measure the elevation again to determine its final size, thereby meeting the construction standards. Use red paint to mark the axis. come out.
Secondly, the erection of the operating platform is the basis for completing the construction of the steel space frame. The erection of this platform is completed in the hall, and it is also equipped with a scaffold with a certain load-bearing capacity, and a sweeping rod is preset on the ground in advance. The distance from the ground is kept within 300mm, and a layer of pad board is added at the bottom of the pole to play a supporting role. On the top surface of the operation platform, lay the steel space frame on it, and add a circle of safety nets around it, mainly to ensure the personal safety of the construction workers. In this regard, the installation of the operation platform is basically completed, and the supervision department After acceptance, if the specified standards are met, subsequent construction can be carried out.
Finally, installation of the space frame. In the process of installation, determine the position of the starting column point in advance to lay the foundation for the subsequent installation, connect the columns one by one, and use rods in the middle to connect them, respectively, from both sides to form a quadrangular pyramid shape , Divide the installation of the steel mesh frame into several different units for installation, and achieve the effect of installation in a certain order to ensure that the rigidity of the mesh frame meets the requirements of roof construction, tighten the bolts, and follow the sequence from both sides to the middle, up and down at the same time. For assembly, the construction of each group of steel space frames is generally handled by four to five construction personnel to ensure the safety of construction personnel during the installation of components. Align the screw holes on each ball respectively and twist in. After all the bolts are aligned and twisted in, the construction personnel fasten the high-strength bolts at the same time. Requirements and matters needing attention: ①Appoint 2~3 people to count the inverted rods and balls, and do not send them by mistake; ②There must be no gaps between the cutting surface and the cone head (sealing plate); ③When it is found that the screw holes do not enter, add oil , Seriously, tap with a tap; if the top wire is cut off, it should be replaced in time; ⑤ When the bending of the rod is greater than 5mm, it should be replaced in time; ⑥ After the installation of the space frame every day, all high-strength bolts should be tightened twice before going off work. , that is, the final screw.
Because the installation of the space frame is very complicated, there are many joints, and there are also bending. Based on this, we must pay attention to the production of the rods, and their dimensions must be prepared correctly, and errors are not allowed. Once errors occur, there will be many included angles, which will affect Installation quality, after the installation is completed, it should be checked to ensure the installation quality.
