Pile foundation is one of the engineering foundations used in high-rise building construction. Pile foundation is generally composed of pile caps and foundation piles. If all the piles are buried underground and only the caps are left on the ground during construction, it is called low cap pile foundation. If the pile body is partially exposed to the ground and the cap is higher than the ground, it means that the pile foundation is a high cap pile foundation. Pile foundation has been widely used in high-rise buildings. As an important part of high-rise buildings, pile foundation has the following characteristics:
(1) The pile foundation of a high-rise building has a large bearing capacity and can bear the vertical load of the whole high-rise building.
(2) The pile foundation of a high-rise building has a certain balance ability, which can effectively ensure the stability of the building without overturning.
(3) The pile foundation of high-rise building is stiff, which can effectively control the uneven settlement of high-rise building and restrain the inclination of high-rise building.
(4) The pile foundation of high-rise building has strong stability, which can effectively ensure the stability and safety of the building under some natural disasters.
Second, the high-rise building pile foundation engineering construction quality problems
Pile foundation of high-rise building is the basis of high-rise building quality assurance. However, due to the influence of many factors such as materials and technology, there are still many problems in the concrete implementation of pile foundation engineering. Through investigation and study, the quality problems in the construction of high-rise building pile foundation engineering mainly include the following points:
(1) There are errors in engineering investigation before construction. Before the concrete construction of pile foundation, we must first make some investigations on it. Investigation is the preparatory activity before pile foundation construction, and it is also the basis for making the construction plan of pile foundation engineering. However, inaccurate survey data, incorrect analysis of land properties, wrong selection of bearing stratum and wrong calculation of friction force may all affect the design of pile foundation construction scheme, thus affecting the progress and quality of the whole project.
(2) Design of pile foundation of high-rise building. The construction design of pile foundation engineering must be determined through comprehensive field investigation and data analysis. If the selection and design of pile foundation type is only based on one-sided, the construction of pile foundation will easily become complicated, which will bury some uncontrollable safety hazards and directly affect the overall quality of high-rise buildings. In addition, problems in pile foundation design may waste a lot of building materials, resulting in high cost.
(3) Problems in pile foundation construction of high-rise buildings. The pile foundation construction technology of high-rise building is the guarantee of pile foundation quality. First of all, the professional quality of pile foundation construction personnel is a problem. Because the design and construction of pile foundation need strict guarantee, the lack of professional quality of construction personnel will directly affect the design, method, progress and economic benefits of pile foundation construction. Secondly, the quality of pile foundation construction materials. No matter how good the engineering design is, it is impossible to build a high-quality project without the support of high-quality raw materials. Therefore, the selection of raw materials for pile foundation construction is also one of the important reasons for the problems in pile foundation construction.
(4) The influence of external environment on the quality of pile foundation. The construction design and method of pile foundation have a great relationship with the external environment of the construction site. For example, when pile foundation construction is carried out on soft soil, the external environment is easy to change after the construction is completed, resulting in a wide range of pile foundation construction quality problems. Therefore, before the construction, the construction site should be thoroughly investigated and analyzed in detail, and the construction scheme in line with the construction environment should be worked out to save the construction cost, ensure the construction quality of pile foundation and improve the economic benefits of the whole high-rise building.
Three, effective measures to control the construction quality of high-rise building pile foundation engineering
In the construction of high-rise buildings, we often use pile foundation as the foundation engineering of buildings. The quality of pile foundation will be directly reflected in high-rise buildings. Although there are still many problems in the implementation of pile foundation in high-rise buildings in China, these problems can be solved to some extent as long as we take effective measures. Through investigation and study, the effective measures to control the construction quality of high-rise building pile foundation engineering mainly include the following points:
(a) before construction, do a good job in the exploration of high-rise building pile foundation, conduct strict research and analysis, and formulate a reasonable construction plan. Construction scheme is the guiding standard of pile foundation engineering, and a reasonable and effective pile foundation construction scheme must be formulated before construction. The formulation of construction scheme can not be separated from the investigation of site conditions. Before construction, you should first go to the construction site to learn more about the nature, size and shape of the land on the construction site. Secondly, we should make a unified calculation and statistics of all the survey data, and make a reasonable construction plan according to past successful cases.
(two) according to the actual situation to choose construction materials, and in strict accordance with the construction plan for engineering construction. The selection of materials is very important for the construction of the whole pile foundation. Therefore, according to the funds of the project and the specific conditions of the construction site, we should choose suitable materials with quality assurance. Secondly, the construction of the project must be in strict accordance with the construction plan, step by step, to ensure the scientific and orderly construction process, and to improve the work progress and economic benefits of high-rise building construction.
(3) Strengthen the professional quality training of pile foundation construction personnel in high-rise buildings. The implementation of any project is inseparable from the participation of professional construction personnel. Pile foundation construction also needs professional construction personnel. Therefore, our engineering team must strictly ask our team members to learn new construction techniques and concepts, strengthen communication between construction teams, and constantly enrich and improve themselves through practice. Only in this way can we ensure the scientificity of the pile foundation construction scheme and the efficiency of the whole construction process.
Fourth, summary.
With the rapid development of China's urban economy and the increasing urban population, urban land resources are becoming more and more scarce, and the per capita land area of urban residents is greatly reduced. High-rise buildings have solved the land shortage problem well, so there are more and more high-rise buildings in cities. As the key to the construction of urban high-rise buildings, the quality of pile foundation has a decisive influence on the overall engineering quality of high-rise buildings. It can be seen that the quality of pile foundation of high-rise building must be paid attention to to to ensure the quality of the whole project.
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