Cement mixing pile bearing capacity improvement planning method

Abstract

The application provides a cement mixing pile bearing capacity improvement planning method, and belongs to the technical field of construction planning, which comprises the following steps: determining the stratum structure of a construction area and the soil composition and density at different depths according to the survey results, and finally determining the bearing conditions at different positions and depths in the construction area. Strategy one is to drill a reinforcing rod into the bottom of the borehole, so that the reinforcing rod is inserted into the stratum below the borehole; strategy two is to enlarge the borehole on the sidewall of the borehole, so as to increase the volume of the final mixing pile and the stability with the stratum. The gap between the initial scheme and the final project requirements is calculated based on the bearing conditions, the combination mode of strategy one and strategy two and the corresponding parameter specifications are selected according to the gap, and finally the initial scheme improved by the strategies guides the construction. The cement mixing pile bearing capacity improvement planning method provided by the application improves the bearing capacity of the mixing pile and improves the required cost, shortens the construction period required for project completion, and improves the enterprise benefit.

Description

Technical Field

[0001] This invention belongs to the field of construction planning technology, and more specifically, it relates to a planning method for improving the bearing capacity of cement mixing piles. Background Technology

[0002] Mud mixing piles are an engineering technology widely used in the treatment of soft soil foundations. The principle involves using cement as the main curing agent, injecting it into the soil using a mixing pile machine and thoroughly mixing it to harden the soft soil and thus increase the foundation strength. This method has become a mature technology after years of development.

[0003] Before actual construction, it is necessary to first clarify the basic conditions of the foundation in the construction area, and then generate a construction plan for the mixing piles based on the load conditions of the above-ground structures. However, for soft soil foundations with poor bearing capacity, in order to ensure that the mixing piles have sufficient bearing capacity, it is necessary to increase the length and outer diameter of the mixing piles, and sometimes the number of mixing piles needs to be increased. This undoubtedly increases the construction cost, and the increase in the specifications and number of mixing piles undoubtedly increases the construction difficulty and prolongs the construction period, resulting in poor corporate benefits. Summary of the Invention

[0004] The purpose of this invention is to provide a planning method for improving the bearing capacity of cement mixing piles, aiming to solve the problems of high construction costs and poor enterprise benefits when the foundation bearing capacity is poor.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a planning method for improving the bearing capacity of cement mixing piles, comprising: Multiple surveys were conducted on the construction area. Based on the survey results, the geological structure of the construction area and the composition and density of the soil at different depths were determined, and the support conditions at different locations and depths of the construction area were finally clarified. Strategy 1 and Strategy 2 are set to improve the bearing capacity of the mixing pile; Strategy 1 involves drilling a reinforcing rod at the bottom of the borehole so that the reinforcing rod is inserted downward into the stratum below the borehole; Strategy 2 involves enlarging the borehole on the sidewall to increase the volume of the final mixing pile and its stability with the stratum. Based on the aforementioned support conditions, the gap between the initial plan and the final project requirements is calculated. According to the gap, a combination of Strategy 1 and Strategy 2, along with corresponding parameter specifications, is selected. Finally, the construction is guided by the improved initial plan.

[0006] In one possible implementation, strategy one involves drilling a reinforcing rod at the bottom of the borehole, inserting the reinforcing rod downwards into the formation below the borehole, including: After the drill bit reaches the specified depth, the drill bit is reset and the reinforcing rod is connected to the bottom of the drill bit; Restart the drilling rig, causing the drill bit to move the reinforcing rod downwards until part of the reinforcing rod is drilled into the bottom of the borehole; after the reinforcing rod reaches the specified depth, separate the drill bit from the reinforcing rod.

[0007] In one possible implementation, separating the drill bit from the reinforcing rod after the reinforcing rod reaches a specified depth includes: An electric locking pin is installed between the bottom of the drill bit and the reinforcing rod. The electric locking pin releases the reinforcing rod after it reaches a designated position; or... The reinforcing rod is threaded to the bottom of the drill bit, and after the reinforcing rod reaches the designated position, the drill bit rotates in the opposite direction to separate from the reinforcing rod.

[0008] In one possible implementation, the step of moving the drill bit downwards, driving the reinforcing rod until a portion of the reinforcing rod penetrates the bottom of the borehole, includes: The top of the reinforcing rod is positioned above the bottom of the borehole. During cement pouring, the cement covers the reinforcing rod. After the cement has solidified, the reinforcing rod serves as an anchor rod at the bottom of the mixing pile.

[0009] In one possible implementation, strategy two involves enlarging the borehole on its sidewall to increase the volume of the final mixing pile and its stability with the formation, including: Based on the aforementioned support conditions, the specific parameters of the hole diameter, number, location, and spacing in Strategy Two are determined. The staggered relationship of the enlargement positions between adjacent boreholes is determined based on the positional relationship between adjacent boreholes and the specifications of the boreholes themselves.

[0010] In one possible implementation, strategy two involves enlarging the borehole on its sidewall to increase the volume of the final mixing pile and its stability with the formation, including: After adjusting the drill bit to the designated position, the drill rod drives the drill bit to swing. During the swinging process of the drill rod, the drill bit cuts the sidewall of the hole to achieve hole enlargement.

[0011] In one possible implementation, adjusting the drill bit to a designated position and then causing the drill rod to swing the drill bit includes: Adjust the drill bit to the specified height and slide the positioning plate to the specified position of the drill rod; inflate the air ring on the outer edge of the positioning plate by inflating it and positioning it on the side wall of the borehole; The drill rod is made to swing within a certain range around the positioning plate, ultimately achieving the enlargement of the drill hole by the drill bit.

[0012] In one possible implementation, selecting the combination of strategy one and strategy two based on the gap, and the corresponding parameter specifications, includes: Based on the aforementioned support conditions, multiple simulations and calculations were performed to determine the gains of applying Strategy 1 and Strategy 2 to the initial scheme, as well as the parameters required for applying Strategy 1 and Strategy 2.

[0013] In one possible implementation, the calculation of the gap between the initial plan and the final project requirements based on the aforementioned support conditions includes: Create a geological model based on the aforementioned support conditions. In the model, construction is first carried out according to the initial plan. After the simulated construction is completed, the initial bearing capacity is calculated. The initial scheme is optimized according to the parameters of the determined Strategy 1 and Strategy 2 respectively, and the optimized scheme is then simulated in the model to calculate the optimized bearing capacity. The analysis examines the improvement between the initial bearing capacity and the optimized bearing capacity, as well as the correspondence between the optimized bearing capacity and the project requirements.

[0014] In one possible implementation, the construction ultimately guided by the improved initial plan includes: An improved mixing pile structure is added to the model, and the physical parameters of the structure are the same as those of the actual mixing pile. The model simulates the changes in the load-bearing condition after a period of time, while applying a pre-set load after construction to each mixing pile structure; the position and structural changes of each mixing pile structure are observed; and the initial scheme after strategy improvement is verified and adjusted.

[0015] The beneficial effects of the cement mixing pile bearing capacity improvement planning method provided by the present invention are as follows: Compared with the prior art, the cement mixing pile bearing capacity improvement planning method of the present invention first conducts multiple surveys of the construction area, determines the geological structure of the construction area and the soil composition and density at different depths after the survey is completed, and finally clarifies the bearing conditions at different locations and depths of the construction area.

[0016] Based on the load-bearing capacity, the gap between the initial plan and the final project requirements is calculated. Then, a combination of Strategy One and Strategy Two, along with corresponding parameter specifications, is selected. Finally, the improved initial plan guides the construction. The method provided in this application can significantly improve the bearing capacity of the mixing piles based on the initial plan, and the improvement cost is relatively low, shortening the project completion period and improving enterprise efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A flowchart of a cement mixing pile bearing capacity improvement planning method provided in an embodiment of the present invention. Detailed Implementation

[0019] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0020] Please see Figure 1 The present invention will now describe the planning method for improving the bearing capacity of cement mixing piles. The planning method for improving the bearing capacity of cement mixing piles includes: Multiple surveys were conducted on the construction area. Based on the survey results, the geological structure of the construction area and the composition and density of the soil at different depths were determined, and the support conditions at different locations and depths of the construction area were finally clarified.

[0021] Two strategies were set to improve the bearing capacity of the mixing piles. Strategy 1 involves drilling a reinforcing rod at the bottom of the borehole so that the reinforcing rod is inserted downward into the stratum below the borehole. Strategy 2 involves enlarging the borehole on the sidewall to increase the volume of the final mixing pile and its stability with the stratum.

[0022] Based on the principle of support conditions, the gap between the initial plan and the final project requirements is calculated. Based on the gap, a combination of strategy one and strategy two and the corresponding parameter specifications are selected. Finally, the construction is guided by the initial plan improved by the strategy.

[0023] The beneficial effects of the cement mixing pile bearing capacity improvement planning method provided by the present invention are as follows: Compared with the prior art, the cement mixing pile bearing capacity improvement planning method of the present invention first conducts multiple surveys of the construction area, determines the geological structure of the construction area and the soil composition and density at different depths after the survey is completed, and finally clarifies the bearing conditions at different locations and depths of the construction area.

[0024] Based on the load-bearing capacity, the gap between the initial plan and the final project requirements is calculated. Then, a combination of Strategy One and Strategy Two, along with corresponding parameter specifications, is selected. Finally, the improved initial plan guides the construction. The method provided in this application can significantly improve the bearing capacity of the mixing piles based on the initial plan, and the improvement cost is relatively low, shortening the project completion period and improving enterprise efficiency.

[0025] In some embodiments of the cement mixing pile bearing capacity enhancement planning method provided in this application, strategy one involves drilling a reinforcing rod at the bottom of the borehole, inserting the reinforcing rod downwards into the stratum below the borehole, including: After the drill bit reaches the specified depth, reset the drill bit and attach a reinforcing rod to the bottom of the drill bit.

[0026] Restart the drilling rig, causing the drill bit to move the reinforcing rod downwards until part of the reinforcing rod is drilled into the bottom of the borehole; after the reinforcing rod reaches the specified depth, separate the drill bit from the reinforcing rod.

[0027] In practical applications, this method of constructing reinforcing rods using the drill bit has demonstrated numerous advantages. Firstly, because the reinforcing rod does not need to be excessively long, material costs are significantly reduced. Furthermore, during construction, there is no need to replace other equipment, minimizing time losses and potential failure risks associated with equipment replacement. It is also remarkably effective in preventing borehole collapse. In some complex geological conditions, borehole collapse can severely impact subsequent construction, and this method effectively solves this problem.

[0028] In practice, construction workers need to precisely control the parameters of each step. For example, the timing of drilling to the designated depth must be precise; drilling too early or too late may affect the subsequent installation of the reinforcing rod. When connecting the reinforcing rod, ensure a secure connection to prevent loosening during the subsequent downward movement of the reinforcing rod.

[0029] When the drilling rig is restarted and the reinforcing rod moves downwards, the operator must closely monitor the drilling depth and the equipment's operating status. Once the reinforcing rod reaches the designated depth, the operation of separating the drill bit from the reinforcing rod must also be carried out with caution to ensure a smooth separation process and not affect the stability of the completed reinforcing rod at the bottom of the borehole.

[0030] Extensive practical experience has demonstrated that Strategy 1 in this planning method for enhancing the bearing capacity of cement mixing piles has performed exceptionally well. After application in multiple engineering projects, the bearing capacity of the mixing piles has been significantly improved, better meeting the design requirements of the projects and providing strong assurance for their safety and stability. In future engineering planning, this method can be further optimized. For example, by combining different geological conditions and conducting more in-depth research and adjustments to the material and shape of the reinforcing rods, the effectiveness of enhancing the bearing capacity of the mixing piles can be further improved, enabling them to play a greater role in various engineering projects.

[0031] In some embodiments of the cement mixing pile bearing capacity enhancement planning method provided in this application, separating the drill bit from the reinforcing rod after the reinforcing rod reaches a specified depth includes: An electric locking pin is installed between the bottom of the drill bit and the reinforcing rod. The electric locking pin releases the reinforcing rod after it reaches the designated position.

[0032] The reinforcing rod is threaded onto the bottom of the drill bit. After the reinforcing rod reaches the designated position, the drill bit rotates in the opposite direction to separate from the reinforcing rod.

[0033] In the case of electric locking pin release of the reinforcing rod, after receiving a signal that the reinforcing rod has reached the designated position, the electric locking pin quickly releases the lock on the reinforcing rod through an internal electromagnetic or mechanical transmission structure, allowing the reinforcing rod to automatically separate and proceed with subsequent operations. For the threaded connection method, as the drill bit rotates in the opposite direction, the friction between the threads gradually decreases until the drill bit and the reinforcing rod are completely separated. At this point, the reinforcing rod will remain at the designated depth, while the drill bit can be retrieved or used for other actions. Further research can be conducted on how to more precisely select one of these two separation methods based on different geological conditions and construction requirements to ensure the more effective implementation of the cement mixing pile bearing capacity enhancement plan. For example, in softer geological layers, the electric locking pin separation method can better guarantee the fixing effect of the reinforcing rod and the overall stability of the pile. In harder geological layers, the threaded connection method can be used for convenience and speed. Further consideration can be given to how to monitor the connection status between the reinforcing rod and the drill bit during the separation process, and how to adjust the construction operation in a timely manner based on the monitoring results to avoid incomplete separation or other abnormalities, ensuring the smooth progress of the entire cement mixing pile construction process and the final construction quality.

[0034] In some embodiments of the cement mixing pile bearing capacity enhancement planning method provided in this application, the process of moving the drill bit to drive the reinforcing rod downwards until a portion of the reinforcing rod penetrates to the bottom of the borehole includes: The top of the reinforcing rod is positioned above the bottom of the borehole. During cement pouring, the cement covers the reinforcing rod, and after the cement has hardened, the reinforcing rod serves as an anchor rod at the bottom of the mixing pile.

[0035] With this structural design, the anchor rods provide additional anchoring force for the mixing piles. When the mixing piles are subjected to external loads, the anchor rods formed by the reinforcing rods effectively prevent displacement at the bottom of the mixing piles, thereby greatly improving the overall bearing capacity of the mixing piles. Through drilling tests under different geological conditions, it was found that this method of setting anchor rods is particularly effective in soft soil strata. In soft soil strata, due to the low strength of the soil itself, the mixing piles often cannot meet engineering requirements by relying solely on the friction between themselves and the soil to resist the load. However, with the reinforcing rods acting as anchor rods, they are tightly integrated with the surrounding soil and can share part of the load, thus significantly improving the bearing capacity of the mixing piles in soft soil strata.

[0036] Furthermore, to better utilize the anchor rods, the material and shape of the reinforcing rods were optimized. High-strength steel was used to make the reinforcing rods, ensuring they would not deform or be damaged under heavy loads. Simultaneously, the reinforcing rods were designed with a threaded structure, allowing the barbs to better engage with the surrounding soil during cement curing, increasing the friction between the anchor rod and the soil, thereby further improving the bearing capacity of the mixing pile.

[0037] In practical engineering applications, the above method is used to implement the cement mixing pile bearing capacity enhancement plan. First, the drilling depth and diameter are determined according to the engineering design requirements. Then, using specialized equipment, a reinforcing rod is accurately placed in the borehole, ensuring its tip is above the bottom of the borehole. Next, cement is poured, ensuring the cement completely covers the reinforcing rod. After the cement hardens, the reinforcing rod becomes the anchor at the bottom of the mixing pile, providing reliable anchoring force. Monitoring and analysis of multiple engineering cases have verified the effectiveness and reliability of this cement mixing pile bearing capacity enhancement plan method.

[0038] For example, this cement-mixing pile method with reinforcing anchor rods was used in a foundation treatment project in a certain city. The project site consisted of a deep soft soil layer, requiring high bearing capacity. During construction, the planned methods were strictly followed. After the mixing piles were constructed, their bearing capacity was tested using static load tests and other methods. The results showed that the bearing capacity of the mixing piles using this method was significantly improved compared to traditional mixing piles, meeting the design requirements of the project and ensuring its safety and stability.

[0039] With the continuous development of engineering technology, research on improving the bearing capacity of cement mixing piles is also deepening. In the future, we may further explore more advanced reinforcing bar designs and construction techniques to further enhance the bearing capacity and engineering performance of cement mixing piles. For example, researching new materials for manufacturing reinforcing bars or improving construction techniques to ensure a tighter bond between the reinforcing bars and the surrounding soil will achieve better bearing capacity improvement under different engineering conditions. Simultaneously, by integrating information technology, we can monitor and analyze the construction process and bearing capacity changes of cement mixing piles in real time, allowing for timely adjustments to construction parameters and ensuring optimal project quality.

[0040] In some embodiments of the cement mixing pile bearing capacity enhancement planning method provided in this application, strategy two involves enlarging the borehole on the sidewall to increase the final volume of the mixing pile and its stability with the stratum, including: Based on the support conditions, clarify the specific parameters of the hole diameter, quantity, location, and spacing in Strategy 2 for hole enlargement.

[0041] The staggered relationship of the enlargement positions between adjacent boreholes is determined based on the positional relationship between adjacent boreholes and the specifications of the boreholes themselves.

[0042] By analyzing the support conditions under different geological conditions, specific parameters for borehole enlargement in Strategy Two were precisely determined. For example, in softer strata, the borehole diameter was appropriately increased to obtain better support. Based on the specific location distribution and specifications of adjacent boreholes, the staggered positional relationship of the enlargement between adjacent boreholes was meticulously planned to ensure the effective improvement of the overall stability and bearing capacity of the cement mixing pile structure. During actual construction, the determined enlargement parameters and staggered positional relationship were strictly followed to ensure the accuracy and quality of the enlargement operation. Construction personnel closely monitored the enlargement of each borehole and adjusted construction parameters in a timely manner to cope with unexpected situations such as possible geological changes. Simultaneously, after the enlargement was completed, the volume of the cement mixing pile and its stability with the strata were monitored and evaluated in real time. Based on the monitoring results, subsequent construction procedures were further optimized to ensure that the bearing capacity of the cement mixing piles reached the expected improvement target, providing a solid guarantee for the safety and stability of the project.

[0043] In some embodiments of the cement mixing pile bearing capacity enhancement planning method provided in this application, strategy two involves enlarging the borehole on the sidewall to increase the final volume of the mixing pile and its stability with the stratum, including: After adjusting the drill bit to the designated position, the drill rod drives the drill bit to swing. During the swinging process of the drill rod, the drill bit cuts the sidewall of the hole to enlarge the hole.

[0044] Specifically, when the drill rod drives the drill bit to oscillate, the amplitude and frequency of the oscillation need to be precisely controlled according to the specific conditions of the borehole. If the oscillation amplitude is too small, the hole enlargement effect will be insignificant, the volume increase of the mixing pile will be limited, and the stability with the formation cannot be effectively improved; if the oscillation amplitude is too large, it may lead to excessive damage to the borehole sidewall, affecting the overall stability of the borehole, and thus adversely affecting the construction quality of the subsequent mixing pile. Similarly, the oscillation frequency is also crucial. A suitable frequency allows the drill bit to cut the borehole sidewall evenly, ensuring the uniformity of hole enlargement.

[0045] In actual operation, it is also necessary to monitor the condition of the borehole sidewall and the motion parameters of the drill rod and drill bit in real time. By installing high-precision sensors on the drill bit, data such as the drill bit's position, cutting force, and oscillation angle can be acquired and transmitted to the control system in real time. Based on preset parameters and real-time monitored data, the control system dynamically adjusts the amplitude and frequency of the drill rod's oscillation of the drill bit to ensure the accuracy and stability of the hole reaming process.

[0046] After the borehole reaches the predetermined size, the borehole sidewalls need to be inspected and treated to further improve the stability of the borehole and the stratum, creating favorable conditions for subsequent cement mixing pile construction. Only by ensuring the quality of borehole reaming and the stability of the borehole sidewalls can the volume of the cement mixing piles be increased and the stability with the stratum be improved, thereby effectively enhancing the bearing capacity of the cement mixing piles.

[0047] In some embodiments of the cement mixing pile bearing capacity enhancement planning method provided in this application, adjusting the drill bit to a designated position and then causing the drill rod to swing the drill bit includes: Adjust the drill bit to the specified height and slide the positioning plate to the specified position on the drill rod; inflate the air ring on the outer edge of the positioning plate by inflating it and positioning it on the side wall of the borehole.

[0048] The drill rod swings within a certain range around the positioning plate, ultimately enabling the drill bit to enlarge the borehole.

[0049] Controlling the amplitude of the swing is crucial during the process of oscillating the drill rod around the positioning plate. Too small an amplitude will fail to effectively enlarge the borehole, while too large an amplitude may damage the borehole sidewalls. Technicians must precisely adjust the amplitude based on the specific geological conditions and design requirements of the borehole. For example, when encountering relatively loose geological layers, the amplitude should be appropriately increased to ensure that the drill bit can adequately enlarge the borehole, improving the enlargement effect and creating better conditions for subsequent cement mixing pile construction.

[0050] Simultaneously, relevant parameters need to be monitored in real time during the oscillation of the drill rod and drill bit. Sensors installed on the drill rod acquire data such as the oscillation angle and force, and transmit this data to the control system. The control system analyzes the data according to preset standards. If any abnormalities are detected during the oscillation, such as excessive deviation in the oscillation angle or unstable force, an alarm will be issued promptly to remind the operator to make adjustments. This ensures that the oscillation process of the drill rod driving the drill bit is stable and accurate, thereby achieving high-quality drilling and hole enlargement operations and laying a solid foundation for improving the bearing capacity of cement mixing piles.

[0051] After the borehole enlargement operation is completed, the borehole needs to be cleaned. Only when all parameters meet the standards can the next step of cement mixing pile construction be carried out. The mixed cement slurry is accurately injected into the borehole after the enlargement treatment, thereby ensuring the construction quality of cement mixing piles, effectively improving their bearing capacity, and meeting the needs of engineering construction.

[0052] In some embodiments of the cement mixing pile bearing capacity improvement planning method provided in this application, the combination of strategy one and strategy two and the corresponding parameter specifications are selected based on the gap, including: Based on the support conditions, multiple simulations and calculations were performed to determine the gains of applying Strategy 1 and Strategy 2 on the basis of the initial scheme, as well as the parameters that need to be set when applying Strategy 1 and Strategy 2.

[0053] Then, based on the gains obtained from simulations and calculations, the differences in the effectiveness of different combinations in improving the bearing capacity of cement mixing piles were analyzed. Specifically, the improvement in key indicators such as compressive strength and shear strength of cement mixing piles was compared when only Strategy 1 was applied, only Strategy 2 was applied, and different combinations of Strategy 1 and Strategy 2 were used. Through detailed analysis of these data, it was determined which combination could most effectively improve the bearing capacity of cement mixing piles to the target value. Next, for the selected optimal combination, the corresponding parameter specifications were further optimized. Considering various factors in actual construction, such as slight changes in geological conditions and differences in the performance of construction equipment, the parameters were fine-tuned. For example, the pile spacing parameters were appropriately adjusted according to different soil hardness; the mixing time parameters were reasonably optimized according to the mixing power of the construction equipment. This ensures that in practical applications, this combination and parameter specifications can stably and reliably achieve an effective improvement in the bearing capacity of cement mixing piles, meeting the needs of engineering construction. At the same time, a corresponding monitoring mechanism was established to monitor the various performance indicators of cement mixing piles in real time during construction, and adjust the parameters in a timely manner according to the monitoring results to ensure that they are always in the optimal state of bearing capacity improvement.

[0054] In some embodiments of the cement mixing pile bearing capacity enhancement planning method provided in this application, the calculation of the gap between the initial plan and the final project requirements based on the support condition includes: Create a geological model based on the support conditions. In the model, construction is first carried out according to the initial plan. After the simulated construction is completed, the initial bearing capacity is calculated.

[0055] The initial scheme was optimized based on the parameters of Strategy 1 and Strategy 2 respectively, and the optimized scheme was then simulated in the model to calculate the optimized bearing capacity.

[0056] The analysis examines the increase in load capacity between the initial and optimized load capacity, as well as the relationship between the optimized load capacity and project requirements.

[0057] Based on the above analysis results, if the optimized bearing capacity still fails to meet project requirements, the parameters of Strategy 1 and Strategy 2 will be adjusted, the initial scheme will be optimized again, and construction will be simulated. The above calculation and analysis process will be repeated until the optimized bearing capacity meets project requirements. At this point, the final optimized scheme will be used as the implementation plan for improving the bearing capacity of the cement mixing piles. Simultaneously, during actual construction, changes in geological conditions will be continuously monitored. If situations differ from those encountered when creating the geological model, the model will be promptly corrected. The construction scheme will be reassessed and adjusted based on the corrected model to ensure that the bearing capacity of the cement mixing piles always meets project requirements.

[0058] In some embodiments of the cement mixing pile bearing capacity enhancement planning method provided in this application, the construction is ultimately guided by the improved initial scheme, including: An improved mixing pile structure was added to the model, and this structure has the same physical parameters as the actual mixing pile in construction.

[0059] The model simulates the changes in load-bearing conditions after a period of time, while applying the pre-set loads after construction to each mixing pile structure; the position and structural changes of each mixing pile structure are observed; and the initial scheme after strategy improvement is verified and adjusted.

[0060] When verifying and adjusting the initial scheme after strategy improvement, if it is found that the bearing capacity of some soil mixing pile structures still does not meet the expected standard, the reasons should be analyzed. It may be that the soil mixing piles are not driven deep enough, resulting in insufficient friction with the foundation. In this case, the construction parameters need to be reassessed, and the soil mixing pile driving depth appropriately increased. Alternatively, the spacing of the soil mixing piles may be unreasonable, preventing the synergistic effect between the piles from being fully utilized. In this case, the spacing of the soil mixing piles needs to be adjusted to ensure that each pile can effectively share the load.

[0061] After simulating the construction process again, the load-bearing capacity of the improved cement-mixed pile structure under preset loads was observed. If the load-bearing capacity meets the planning requirements, the scheme can be applied to actual construction. During the actual construction phase, the initial scheme after strategy improvement was strictly followed to ensure the construction quality of each cement-mixed pile, including the verticality of the pile, the amount of cement added, and the uniformity of mixing. Simultaneously, the construction parameters and actual load-bearing capacity of the cement-mixed piles were continuously monitored during construction, and compared with the model simulation results to promptly identify and resolve potential problems, ensuring that the load-bearing capacity of the cement-mixed piles achieves the planned improvement target. After construction, a comprehensive inspection of the entire cement-mixed pile foundation was conducted to assess whether its actual load-bearing capacity is consistent with the plan, providing a reliable guarantee for the safety and stability of subsequent projects.

[0062] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A planning method for improving the bearing capacity of cement mixing piles, characterized in that, include: Multiple surveys were conducted on the construction area. Based on the survey results, the geological structure of the construction area and the composition and density of the soil at different depths were determined, and the support conditions at different locations and depths of the construction area were finally clarified. Strategy 1 and Strategy 2 are set to improve the bearing capacity of the mixing pile; Strategy 1 involves drilling a reinforcing rod at the bottom of the borehole so that the reinforcing rod is inserted downward into the stratum below the borehole; Strategy 2 involves enlarging the borehole on the sidewall to increase the volume of the final mixing pile and its stability with the stratum. Create a geological model based on the aforementioned support conditions. In the model, construction is first carried out according to the initial plan, and the initial bearing capacity is calculated after the simulated construction is completed. The initial scheme is optimized according to the parameters of the determined Strategy 1 and Strategy 2 respectively, and the optimized scheme is then simulated in the model to calculate the optimized bearing capacity. Analyze the improvement range between the initial bearing capacity and the optimized bearing capacity, and the correspondence between the optimized bearing capacity and the project requirements; in order to determine the gap between the initial solution and the project requirements. Based on the gap, select the combination of Strategy 1 and Strategy 2 and the corresponding parameter specifications; An improved mixing pile structure is added to the model, and the structure has the same physical parameters as the actual mixing pile in construction. The model simulates the changes in the support condition after a period of time, while applying a preset load after construction to each mixing pile structure. Observe the location and structural changes of each mixing pile structure; verify and adjust the improved initial plan, and finally guide the construction with the improved initial plan.

2. The method for planning and improving the bearing capacity of cement mixing piles as described in claim 1, characterized in that, The first strategy involves drilling a reinforcing rod at the bottom of the borehole, inserting the reinforcing rod downwards into the formation below the borehole, including: After the drill bit reaches the specified depth, the drill bit is reset and the reinforcing rod is connected to the bottom of the drill bit; Restart the drilling rig, causing the drill bit to move the reinforcing rod downwards until part of the reinforcing rod is drilled into the bottom of the borehole; after the reinforcing rod reaches the specified depth, separate the drill bit from the reinforcing rod.

3. The method for planning and improving the bearing capacity of cement mixing piles as described in claim 2, characterized in that, The step of separating the drill bit from the reinforcing rod after the reinforcing rod reaches a specified depth includes: An electric locking pin is installed between the bottom of the drill bit and the reinforcing rod. The electric locking pin releases the reinforcing rod after it reaches a designated position; or... The reinforcing rod is threaded to the bottom of the drill bit, and after the reinforcing rod reaches the designated position, the drill bit rotates in the opposite direction to separate from the reinforcing rod.

4. The method for planning and improving the bearing capacity of cement mixing piles as described in claim 3, characterized in that, The step of causing the drill bit to drive the reinforcing rod downwards until a portion of the reinforcing rod penetrates to the bottom of the borehole includes: The top of the reinforcing rod is positioned above the bottom of the borehole. During cement pouring, the cement covers the reinforcing rod. After the cement has solidified, the reinforcing rod serves as an anchor rod at the bottom of the mixing pile.

5. The method for planning and improving the bearing capacity of cement mixing piles as described in claim 2, characterized in that, Strategy two involves enlarging the borehole on its sidewall to increase the volume of the final mixing pile and its stability with the formation, including: Based on the aforementioned support conditions, the specific parameters of the hole diameter, number, location, and spacing in Strategy Two are determined. The staggered relationship of the enlargement positions between adjacent boreholes is determined based on the positional relationship between adjacent boreholes and the specifications of the boreholes themselves.

6. The method for planning and improving the bearing capacity of cement mixing piles as described in claim 5, characterized in that, Strategy two involves enlarging the borehole on its sidewall to increase the volume of the final mixing pile and its stability with the formation, including: After adjusting the drill bit to the designated position, the drill rod drives the drill bit to swing. During the swinging process of the drill rod, the drill bit cuts the sidewall of the hole to achieve hole enlargement.

7. The method for planning and improving the bearing capacity of cement mixing piles as described in claim 6, characterized in that, The step of adjusting the drill bit to a designated position and then causing the drill rod to swing the drill bit includes: Adjust the drill bit to the specified height, and slide the positioning plate, which is slidably sleeved on the drill rod, along the drill rod to the specified position; inflate the air ring on the outer edge of the positioning plate by inflating it and positioning it against the side wall of the borehole; The drill rod is made to swing within a certain range around the positioning plate, ultimately achieving the enlargement of the drill hole by the drill bit.

8. The method for planning and improving the bearing capacity of cement mixing piles as described in claim 1, characterized in that, The method for selecting the combination of strategy one and strategy two based on the gap, and the corresponding parameter specifications, include: Based on the aforementioned support conditions, multiple simulations and calculations were performed to determine the gains of applying Strategy 1 and Strategy 2 to the initial scheme, as well as the parameters required for applying Strategy 1 and Strategy 2.

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