1 How to solve the accident in pile foundation construction
Various construction problems often occur in pile foundation construction. The most common problems are the quality of building materials and false geological exploration data, which lead to construction accidents. Improper operation methods often lead to construction accidents. For example, hole collapse accident during drilling, pipe burying accident during concrete pouring, pile breaking accident during pile sinking and so on. Every accident will cause a lot of economic losses. In the event of a construction accident, decisive measures must be taken. Analyzing the cause of the accident is a prerequisite for solving the problem. Only by finding out the root cause of the accident can an effective solution be worked out quickly. After the specific solution is determined, the consequences of the accident should be remedied immediately, and the problem should be solved in the shortest time to avoid repeating the same mistakes in the construction.
2 Specific operations of different types of pile foundation construction
According to the different environment of the construction site, different pile foundation construction schemes should be formulated. Pile foundation construction mainly includes precast pile construction and grouting construction. 2. 1 building pile foundation is selected for precast pile. 2. 1. 1 precast pile as the operation technology of concrete material concrete pile is favored by all kinds of construction projects because of its advantages of durability, strong bearing capacity and convenient manufacture. When selecting precast concrete piles as pile foundation materials, the quality of concrete piles should be strictly controlled, and the manufacturing process of piles should be fully controlled, which can be synchronized during construction or customized in advance. The strength of concrete piles can be slightly different according to different construction methods, but it must meet the minimum hoisting and transportation standards; The length and thickness of concrete piles can be determined according to the site requirements, and the stacking number is limited to three layers to prevent compression deformation or fracture; Concrete piles can be lengthened as required, which can be done by various methods, usually during piling. 2. 1.2 Selection of precast piles as the operation process of steel piles The raw materials selected for steel piles should meet the actual needs of the project, including the determination of strength, structural accuracy and other indicators; Steel piles should be treated with anti-corrosion during production and transportation to avoid being stored in places with high humidity. Before construction, necessary derusting operations should be carried out for steel piles to prepare for the next painting operation. When welding steel piles, pay attention to the precise docking of interfaces, minimize errors, and the welding angle should also meet the construction standards. After welding is completed, the residual impurities should be cleaned up in time. Steel piles should be transported carefully to avoid collision and damage. If it is damaged, it should be repaired or replaced in time. Pay attention to the accuracy of position and angle when lowering piles. 2.2 Concrete construction scheme for burying pile foundation by pouring method 2.2. 1 Immersed cast-in-place pile needs to be drilled first, and attention should be paid to the selection of methods, such as hammering vibration and vibration impact. In the process of hammering, the hammering weight should be selected according to the diameter of the pile. Generally, the diameter of the pile tip is 300-500mm, and the length of the cast-in-place pile is less than 20m, so that the cast-in-place pile can be hammered into the hard clay layer or the medium-coarse sand layer. This drilling method uses simple equipment and simple operation method, which improves the working speed of construction workers, not only saves labor, but also reduces economic costs. The disadvantage is that problems are easy to occur and the construction quality cannot be effectively guaranteed. This is also caused by various reasons, including the defects of the equipment itself and improper grasp in the operation process. Acceptance: after the hole is completed, make the reinforcing cage, and then move and fix it. After this step is completed, the acceptance work must be carried out, and the pouring work can only be carried out after the acceptance is qualified. Pouring: When pouring underwater, concrete is required to have certain workability. When carrying out scale experiment, the slump should be specified, generally between 18-22 cm. In order to remove the waterproof plug when pouring, the distance between the conduit and the bottom of the hole should not be too high, generally controlled between 30-50 cm, and the pile diameter should be appropriate. 2.2.2 As the name implies, the specific construction scheme of digging piles should be done well. The construction sequence of digging piles is basically the same, and the construction method also follows certain principles. The opening methods used in digging piles are different and have certain universality. Both manual excavation and mechanical equipment can be used for drilling. Pay attention to safety when digging holes manually. The diameter of dug pile is generally greater than 1 m. The depth is also specified, generally 15m. If the pile diameter is between 1.2- 1.4m, the corresponding installation length should be controlled within 30m. Protection: When digging to a depth of 0.9- 1.0m, wall protection measures should be taken, concrete can be sprayed around the hole wall, and then reinforcement connection should be done well. In the process of digging a hole, it is necessary to enlarge the hole when it reaches a certain depth, and then the reinforcing cage can be installed, and then the concrete can be poured. 2.2.3 Concrete implementation of bored piles The methods and steps of bored piles are basically the same as those of other bored piles, but the equipment used is different. Bored piles are generally drilled by rotary machinery, and the pile diameter and bearing capacity also have different ranges. Therefore, the equipment should pay attention to seepage control measures when opening holes. Before opening construction, the pile mouth should be cleaned up in advance to ensure the smooth development of subsequent pile filling work.
3 Conclusion
In the process of pile foundation construction, the selection of materials and methods is very important, and professional construction technology should be adopted and the operation should be carried out in strict accordance with construction standards. Pile foundation construction is a basic project. It is a practical construction method to transform unfavorable construction conditions into an environment that can meet the construction requirements and improve the land utilization rate. Pile foundation construction has also made great contributions to ensuring the quality of buildings, improving the stability and durability of buildings, making buildings safer and more practical, and meeting people's standards for building safety.
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