Construction principle of bored pile and its technical application in water conservancy project?

The main reinforcement works of this project include dike reinforcement of 6.62km, dike protection and reinforcement of1.86km, complete dike project management equipment (demolition and reconstruction of 4 flood control stations) and reconstruction of 2 sluices. 2 Construction principles of bored piles In the early stage, the construction of water conservancy projects requires a lot of manpower and material resources. With the emergence of bored pile technology, China's water conservancy projects have developed rapidly. The frequency of bored pile technology in people's daily use is getting higher and higher, but because the application of bored pile technology in water conservancy facilities is a bit backward, it plays a very important role in the construction process. Once an error occurs, it will affect the construction period and completion quality, so special attention is needed. In the process of bored pile construction, construction personnel should not only pay attention to waterproof and mud prevention, but also pay attention to their own safety to avoid unnecessary damage to the construction site. In the early construction process, the operator should pay attention to all the mud and low water holes to ensure the cleanness of the holes, then insert the conduit to determine the depth of concrete in the concrete, and quickly insert the conduit to ensure the smooth implementation of the isolation layer. On the other hand, the concrete filling process is based on a certain height difference between the conduit and the inlet, and the concrete to be poured can be filled into the conduit by using the height difference. It can be used not only in water conservancy projects, but also in bridge construction, water conservancy construction and bridge foundation construction. However, due to the complexity of the former operation, special technology is needed in the construction process. Construction units generally use ultra-deep piles for construction, which can ensure the stability in the construction process and avoid tilting accidents during drilling. Therefore, it is necessary for the construction personnel to fix the drilling rig, and only by setting up each step can the stability of the overall construction be guaranteed. 3 Characteristics of bored pile technology The characteristics of bored pile construction are divided into the following parts: (1) The characteristics of using bored pile in water conservancy construction are mainly because of its low noise, and the bored pile technology is constructed from underground, so many holes are formed underground. These holes can also be compared with direct underground pouring concrete and other filling techniques. This method is very simple and reduces the fluctuation and noise. (2) Because the diameter of the pile foundation is very large, the diameter of the hole is directly related to the diameter of the bored pile foundation when drilling. Therefore, in the construction process, if it is necessary to increase the diameter of the installation machine, it is necessary to increase the diameter of the drilling hole. However, in the application process of drilling and grouting technology, because the precast pile is made of fixed model and fixed equipment, if the precast pile with larger diameter is made, it will also affect the handling. Therefore, in the construction process, the constructors all produce prefabricated pipe strings according to the designed drawings and models. (3) The bored pile has strong adaptability. This technology can be applied to any place where drilling can be done, whether on land or in water. After drilling, the mixed concrete can be poured into it, so the application of this method will not be limited and restricted by geographical factors. (4) The bored pile foundation is usually constructed on site due to the site environment, so the quality of the construction process also determines the bearing capacity of the pile foundation. In the process of construction, the quality of pile foundation depends on many factors, such as the control of construction personnel and on-site guidance. 4 Construction advantages of bored pile 4. 1 High safety factor In actual construction, drilling grouting should be carried out according to construction conditions such as soil thickness and pile foundation construction effect to ensure the safety of water conservancy construction projects. At the same time, the above measures can effectively improve the construction efficiency and quality. In the process of bored pile construction, concrete infiltration bonding is adopted to make the foundation soil bear certain pressure and ensure the stability of the foundation. Only high quality foundation construction can ensure the quality of the whole project. 4.2 Stability of soil layer In the process of bored pile construction, the first thing we need to do is to detect the stability of soil layer, and the follow-up work can only be carried out if the soil layer is stable and does not collapse. More importantly, we must strictly control the permeability of soil, operate in strict accordance with the norms of water conservancy projects in China, ensure the safety in the construction process, and pay attention to the details of bored piles, so as to effectively improve the foundation balance of water conservancy construction projects. 4.3 The application of economic benefits in domestic water conservancy industry and competition among water conservancy enterprises in many fields has been improved to some extent. Therefore, water conservancy enterprises should first consider economic issues when competing for projects. In different industries, water conservancy enterprises should consider the economic benefits of different problems in different competitive environments. In China, the construction environment and technology of similar water conservancy projects are different, and the cost of different water conservancy projects is also different, which will inevitably have an impact. Economic benefits of water conservancy. Engineering. However, if the cost is well controlled in the process of drilling pile construction, it will have a positive impact on the growth of economic benefits. At the same time, the construction of bored piles has been widely used in water conservancy projects, and different conditions and soil properties can cooperate with each other. With the progress of construction, it has played a positive role in improving the economic benefits of construction enterprises. 5 Disadvantages of bored piles Compared with ordinary concrete bored piles, the construction process of bored piles is quite complicated, and there will be some problems in the technology of bored piles, which requires higher requirements for construction personnel and requires some professional technical points in order to be more professional in the construction process and improve the construction quality. However, if the level of recruited construction workers is too different and their professional knowledge is not in place, it will have a negative impact on the whole project. These are all human factors. If the bored pile is not properly poured, a series of serious problems such as sticking, collapse, water leakage and necking will occur in the construction process. Therefore, in practical operation, scientific methods should be adopted to study and analyze the technology. Find scientific and reasonable methods to solve the problems that should be paid attention to, further give full play to the maximum role of technology, and ensure that the basic quality of water conservancy projects is effectively guaranteed. 6 Application of drilling technology in hydraulic engineering 6. 1 Soil layer survey Geological soil survey technology mainly investigates the geological soil structure in the construction area of hydraulic engineering, and geological soil survey technology is the data reference basis for the application scheme of bored pile construction technology. According to the special situation of soil layer, the corresponding scheme design is directly carried out in the scheme design to prevent various possible risks and ensure the smooth and efficient construction. 6.2 Plane setting-out shall investigate the site situation in advance and deal with it in advance. One is to ensure that the ground on the construction site is flat and the construction machinery and equipment placed on the construction site are vertical. Flush with the ground, smooth operation in the construction process, keep the construction site clean and orderly, then measure and set out, and reasonably build drainage facilities. Then use measuring tools to accurately measure the drilling position, specifications, pile location and other things that need to be measured. 6.3 Two slurry inlets and outlets are reserved at the upper part of the buried pipe, with a height of 40cm, a width of 20cm, a thickness of 6mm and a diameter of 2m ... The lower part of the bottom of the shell is provided with a knife foot, and the top of the shell is provided with a lifting ring. Before the casing is buried, the pile position is protected by crossing method. After the pile protection measures are completed, the casing depth of rotary drilling rig is higher than that of reverse circulation drilling rig. After the casing burial depth is completed, check the pile position after confirming that the casing burial depth is stable and accurate, and the drilling rig is in place after confirmation. 6.4 Drilling construction refers to the grouting wall protection of bored piles. Before drilling construction, the cement mixture ratio must be used and protected in mud mixing and protection. Only by scientific deployment according to the specific conditions of piles can the stability of mud be guaranteed and the purpose of retaining wall be achieved. On the inner wall of the pile, add liner to the mixed cement slurry, and then start drilling. Pay attention to apply WOB with drill pipe to ensure the stability of drilling construction and avoid adverse effects on the surrounding or subsoil. 6.5 When the hole is cleaned and drilled to the specified position, it should be kept in its original state. Turn the drill bit several times to clean it up, and then remove the excess soil on the drill bit to form a stable structure in the pile. After drilling is completed, clean up and check the quality, and check whether the specifications and dimensions of the hole pile are the same as the design scheme. When inspecting the inside of the hole pile, a tripod with a special inspection device should be installed, and the hole detector should be lifted to inspect the inside of the hole pile. 6.6 Before concrete pouring, the reinforcing cage should be put into the pile, and then the concrete pouring material with mixing ratio should be poured. In order to ensure the timeliness of concrete drilling, grouting will be completed within half an hour or will be carried out. Grouting conduit should be completely inserted into the pile to ensure the adequacy of grouting process and avoid uneven grouting. In the process of grouting, the conduit should always go deep into the grouting pile to avoid pile breakage. Pay attention to the strength of grouting pile head until the grouting is over. After grouting is completed, take out the catheter slowly, and then carry out quality inspection. After passing the quality inspection, the perfusion device should be emptied and the protective tube pulled out, and the speed should not be too fast. 7 Conclusion To sum up, through vigorous promotion in China, bored piles have been widely used in water conservancy projects at this stage. Effectively improving the construction level of bored pile technology is of great help to ensure the quality of water conservancy projects and prolong the service life. Construction units need to train professional and technical personnel in order to better improve building quality and provide theoretical guidance for more construction.

For more information about project/service/procurement bidding, and to improve the winning rate, please click on the bottom of official website Customer Service for free consultation:/#/? source=bdzd