Key Points of Space Frame Construction Quality Control( Part 2)

4.2 Construction process management

From the perspective of practical application, since the space frame project requires cantilever construction and high-altitude operations, the space frame construction process has a direct impact on the quality of the project. The technical points involved in the construction process of the space frame project are relatively complicated, and at the same time involve a large number of aerial operations. Only by achieving a high degree of cooperation among personnel, machinery and materials can the construction requirements of the project be met. The key points in the construction process of space frame engineering include the following aspects.

①Regarding the dimensional deviation and alignment work, the staff must understand the connection between various positions in the space frame construction, and timely discover and adjust the errors existing in the construction process.

②During the construction process, the staff need to complete the component connection by welding and assembling. Since the unqualified welding quality will affect the subsequent construction of the steel structure project, the staff must ensure the welding quality.

③When applying the high-altitude bulk installation process, the construction and dismantling of the work platform is crucial. The stability and convenience of the work platform will affect the efficiency and quality of the construction, and the staff should pay enough attention to this. From the perspective of technological process, the installation technology of space frame structure is relatively complicated, and there are many factors affecting the construction of space frame structure. Therefore, controlling the construction process is conducive to the implementation of project quality management objectives.

4.3 Inspection and acceptance quality control

Inspection work runs through the whole process of engineering projects, and it is one of the ways to grasp the quality situation and realize quality management. First of all, before construction, the staff needs to test the materials to ensure that the quality of the materials is qualified. Secondly, after the structural design scheme is determined, the staff needs to test the feasibility and stability of the scheme. Thirdly, during the construction process, the staff need to pass multiple inspections to ensure the construction quality, clarify the bearing capacity, deflection and other indicators, and ensure the stability and safety of the structure from the perspective of structural mechanics. Finally, the staff needs to apply non-destructive testing technology to detect whether there are abnormalities or defects in the internal structure of the project. In order to achieve effective quality control, the staff need to clarify the testing standards during the testing process, use advanced testing technology to carry out various tasks, and formulate a comprehensive work plan according to the testing results.

Acceptance is also an important part of the construction quality management of space frame structures. Based on the special needs of the space frame project, the staff can use extended investigation methods, spot check analysis methods, professional analysis methods and other means to adopt a combination of staged acceptance and hidden acceptance to ensure the effectiveness of quality control work. The staff should divide the space frame project into several construction sections for separate acceptance, and conduct the whole process acceptance according to the relevance of each stage of the space frame project. For concealed projects, the staff can adopt methods such as extended investigation, spot check analysis, and professional analysis to conduct a comprehensive inspection and retain relevant information.

4.4 Quality Control of Related Projects and Auxiliary Projects

In order to achieve comprehensive quality control, during the construction of the space frame project, the staff need to do a good job in the quality control of related projects and subsidiary projects. The space frame project is usually used as a part of other projects, and rarely forms a building structure independently. Therefore, for the related projects and auxiliary projects in the space frame project, the staff need to carry out special control. Before the construction of the space frame project, the staff need to conduct a comprehensive inspection and acceptance of the related projects, and after these projects pass the acceptance, the space frame project construction will be carried out. After the construction of the space frame project is completed, the staff also need to carry out ancillary construction such as anti-corrosion and fire protection. At present, workers usually complete such ancillary works by painting special paints. In this process, the staff must ensure that the special coatings used meet the requirements of relevant standards to ensure the construction quality. In addition, during the construction of the space frame project, the staff often need to build a working platform. The quality of the operating platform plays an important role in ensuring the construction quality of the space frame project. Therefore, the staff must attach great importance to the construction of the operating platform.

5 case engineering quality control measures

5.1 Carry out special design optimization according to special needs

Since the project has high quality requirements and may be affected by rain, snow and wind loads during the construction process, the author proposes the following special design optimization measures: First, determine the local maximum snowfall and maximum wind value, and then carry out design work on this basis, while reserving a certain safety space; the second is to use the three-dimensional modeling function of BIM technology to carry out structural design work, verify the safety of the design scheme from multiple angles, and use finite element Analysis technology simulates the safety guarantee capability of the space frame structure in extreme environments.

5.2 Do a good job of inspection and correction

The space frame project is attached to the existing project, and the staff need to carry out the construction work of the new structure on the basis of the original project, but the quality and structural size of the original project are difficult to meet the relevant requirements of the existing project. In this regard, the author proposes the following measures. First, before the start of the project, the staff should check the quality of the existing project, and repair the problematic parts through rectification and reinforcement to ensure the safety of the project construction. Second, for the problem of component size deviation, the staff needs to do a good job of rectifying the deviation according to the design drawings and engineering practice, so as to ensure that the existing component size can meet the construction requirements of the space frame project.

5.3 Build an operating platform

In this project, the staff cannot carry out assembly work on the ground, and must adopt the method of aerial installation for construction. In order to ensure the quality and safety of the construction, the staff should use the scaffolding method to build the operation platform, and carry out various construction work on the platform. In the process of building scaffolding, the staff should fully consider the bearing capacity of the support plate, construction load and material self-weight. Under the protection of the full frame, the staff can successfully complete the installation and connection work. In the case that the site of the project is small and the staff cannot perform vertical installation, building a scaffolding operation platform can basically solve the problem of difficult quality control of the project’s aerial alignment construction.

5.4 Do a good job in deflection control

In this project, the realization of the deflection control target requires staff to conduct comprehensive management from multiple perspectives. Before construction, the staff needs to conduct a comprehensive inspection of the rods and connecting parts to ensure that they meet the requirements of the project ; The code requires deflection testing; after sub-projects are completed, workers need to apply non-destructive testing techniques to detect whether there are abnormalities or defects inside the building structure. All in all, the staff should achieve the deflection control goal of the project through synchronous control.

5.5 Do a good job of welding quality control

In this project, the staff need to carry out welding construction. In this regard, the author proposes the following quality control measures. One is that the staff need to clean the construction base surface by grinding and cleaning before welding, so as to improve the reliability of welding. The second is that the staff should do a good job in debugging, testing, and maintenance of the welding machine to avoid failure of the welding machine. The third is that the staff should try to avoid welding work in rainy, snowy, low temperature, and strong wind weather. In short, the staff must ensure the quality of welding construction through special control in various aspects.