With the continuous progress of science and technology in China, what are the commonly used methods for pile foundation construction in the construction industry? How to use and practice the basic construction technology? The following is the relevant information compiled by the editor of China Construction Network. The basic introduction is as follows:
Pile foundation is an important part of construction projects and is also the foundation of the entire ground building. During the construction process of pile foundation, Due to the influence of different areas and external factors, the construction methods of pile foundations are mainly divided into three types: dug cast-in-place piles, drilled grouting cast-in-place piles, manually dug cast-in-place piles, etc. For each type of pile foundation, In terms of construction methods, each construction method has its own characteristics. Pay attention to the adoption of construction technology methods, and at the same time, it is also necessary to consider all aspects of the entire construction process, so that problems that arise in all aspects of construction can be dealt with in a timely manner and effectively contained. 1. Application research on pile foundation construction With the rapid development of urbanization in my country, the requirements for prefabricated piles are getting higher and higher, so it is necessary to first understand some concepts of pile foundation construction. Precast piles can generally be divided into two forms: concrete precast piles and steel piles. Concrete is strong, has a large load-bearing capacity, can be constructed for a long time and is fast, which lays the foundation for construction projects. Pile foundation is a very common form of building construction that is different from foundation. Professional knowledge is to use some solid materials to stabilize the construction foundation. These stable pile foundations can be square, round or other shapes. . The function of pile foundation is to share the load weight of structures on the ground or in the foundation to a large extent, so as to solve more serious problems such as insufficient load-bearing in the building foundation and deformation of the building foundation. 2. Pile foundations are used in construction projects. Pile foundations can be divided into three categories according to the construction methods: bored pile foundation construction methods, bored grouting pile foundation construction methods, and manual dug cast-in-place pile foundation construction methods. But if distributed more carefully, there may be more than 300 construction methods for pile foundations. According to the requirements of new buildings and the architectural characteristics of the new era, the construction methods of pile foundations are constantly updated, and their development, changes and updates are The speed is changing day by day. 2.1 Construction methods of cast-in-hole pile foundation construction The foundation construction of cast-in-hole piles is one of the most common forms. The main feature is that very few mechanical constructions are used, and most of the construction is manual. The specific construction methods for this kind of pile foundation include: measuring and positioning, burying steel casings; leveling the construction site; building well platforms, setting up drainage ditches and slag removal channels; installing lifting equipment; excavation, drainage, and hole walls of pile holes Supporting; processing and hoisting of steel cages; paying attention to underwater concrete; cutting out pile heads for inspection. During the entire construction process, not only on-site investigation is required, but also professionals are required to conduct hole-forming tests on the construction site before construction, as well as analysis of soil quality, hydrology and other related conditions, in conjunction with the design and survey units. After discussing the design plan and waiting for the final construction plan to be formed and accepted, an effective construction method of bored pile foundation can be formulated and the comprehensive construction of the building can begin. 2.2 Construction methods of bored and grouting pile foundations What needs to be done in the construction of bored and grouting pile foundations is: preparation of mud before construction, because for bored and grouting pile foundations, mud is the safety and quality of the entire construction. The key point is to bury the casing of the borehole. During the burying of the casing, the surrounding casing should be filled with compacted soil. The main purpose of this step is to prevent the casing from collapsing during the process of water leakage. There are unsafe accidents during construction. Therefore, during the entire drilling process, you must always pay attention to checking the flatness of the drilling rig and the verticality of the drill pipe to prevent the unstable influence of the foundation during the process. The implementation of this step is related to the smooth operation of the cast-in-place piles. Construction; During the drilling process, it is necessary to conduct hole construction research and experiments on different strata and geology, and then formulate corresponding technical parameters according to different situations. More factors must be taken into consideration; finally, the mud indicators must be evaluated. Check, and make appropriate additions and adjustments to the mud or purification, so that the final hole clearing and bored pile work can be carried out better; for hole cleaning, it generally needs to be carried out in two steps, after the final hole cleaning and steel bar installation. For secondary hole cleaning, it is not advisable to use a measuring rope to measure the hole depth. When the hole depth meets the design requirements, it is the final hole.
2.3 The construction method of artificially dug cast-in-place pile foundation. The current construction method of artificially dug cast-in-place pile foundation is somewhat detailed with the construction method of dug-in-hole cast-in-place pile foundation. However, it is quite different in some aspects. For the main work is construction. The four steps include preliminary preparation, manual pile digging, concrete pouring, and project acceptance. For the construction of artificially dug cast-in-place pile foundations, it should be noted that there is a certain quality guarantee for the entire construction materials. It is prohibited to use materials that do not meet the requirements. When laying out the wiring during the construction process, it must be within the prescribed limits. To operate within the scope, the instruments used must also be calibrated and must be accurate. When pouring concrete, attention should be paid to accurately calculating the amount of concrete to avoid excessive waste and adverse effects on the environment. Finally, during the construction process, the inspection work of the project shall be carried out according to the specification requirements. The data displayed on the equipment must not be falsified or arbitrarily altered. It is necessary to collect data during the entire work process, and then perform quality management work throughout the entire construction process. For the construction of cast-in-place pile holes with safety measures, the construction party and the supervisor must do the acceptance of quality engineering and steel bars. The final step in the production and quality acceptance of the cage is the key concrete pouring construction in the entire process. For the pile foundation method such as manually dug cast-in-place piles, it has certain advantages. The machine is simple and easy to operate. The occupation area of ??the construction site is not high, and it has the characteristics of having an impact on surrounding buildings and reliable quality. It can also be used as pile foundations for high-rise buildings, public buildings, and hydraulic buildings for support, anti-slip, and soil retaining purposes. Therefore, during the actual construction process, the construction party shortens the construction period, reduces the construction budget, etc. in order to fully carry out the construction. Under certain circumstances, choose this method to carry out construction work. 3. Pile foundation has a wide range of application in construction projects. However, based on the principles of economy and ease of construction, it is generally not sufficient when the natural foundation bearing capacity (including vertical and horizontal) is insufficient and simple reinforcement cannot be achieved. If required, a pile foundation is selected, and the load force is transmitted through the pile foundation to the stratum whose bearing capacity can meet the requirements. In the scope of application of pile foundations in construction projects, the construction party needs to pay attention to the fact that high-rise buildings or other important buildings with excessive settlement and uneven settlement are not allowed around the foundation; for surrounding buildings, chimneys and transmission towers, etc. Tall and high-structure buildings must adopt a careful posture. Pile foundations should be used to withstand large uplift forces and horizontal forces to prevent the tilting effect of some larger buildings; foundation settlement and subsidence should be reasonably controlled. Rate; for a larger part of the soft foundation, testing needs to be done before construction. When the thickness of soft soil is thick, because some pile tips cannot reach a good depth, we should consider the settlement of the pile foundation and other issues, and effectively transfer the load to the weak layer below the pile foundation, thereby making the pile foundation more stable. Good stability. In the practice of construction projects, the work of pile foundations is carried out under foundation survey, plan, and design. For construction, foundation survey, plan, and design are the real guarantees. At the same time, this is also the basis for construction. principles that must be followed.
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