Pile foundation supplementing construction technology under existing pile foundation condition

Abstract

The present application provides a pile foundation supplement construction process under the condition of existing pile foundation, comprising the following steps: obtaining the coordinate system of original pile foundation construction, determining the pile sinking information of existing pile foundation; at the position to be supplemented, precast pile foundation is sunk to the first set position, then the pile body is pulled out, the detection assembly is arranged at the downward end of the pile body, the peripheral environment of the detection point is obtained by selecting the rotating detection mode through the measuring tube and the first detection assembly in the measuring tube, and the geological radar detection record drawing is drawn; whether to continue pile supplement sinking or re-pile supplement is judged according to the geological radar detection record drawing; if the pile sinking is continued, when the precast pile foundation is sunk to the second set position, the coordinate of the original pile foundation and the peripheral original pile foundation distribution at the second set position are detected by using the measuring tube and the second detection assembly in the measuring tube, the pile supplement sinking scheme is set according to the detection data, and the pile supplement sinking is continued until the pile supplement sinking is completed. The present application realizes the obstacle avoidance detection in encryption by setting the detection unit.

Description

Technical Field

[0001] This invention relates to the field of pile foundation construction methods, specifically to the pile supplementation construction process under existing pile foundation conditions. Background Technology

[0002] Pile foundations are widely used in foundation design due to their advantages such as good integrity, high bearing capacity, small settlement, and flexible structural layout. With the improvement of national infrastructure and the rational adjustment of urban planning, many projects may find that their original pile foundations no longer meet requirements due to external environmental factors. Therefore, it is necessary to continue or renovate the project while retaining the existing pile foundations. However, the original pile foundations are deeply buried in the foundation soil, and their location can be difficult to determine due to their age or inaccurate original construction. When pile densification is required during project renovation, ignoring the existence of the original pile foundations may lead to pile collisions, damaging the existing pile foundations and preventing effective pile densification. Therefore, in practical engineering, it is necessary to predict the location of existing pile foundations to prevent pile collision accidents and provide accurate data for subsequent pile densification work.

[0003] For projects involving denser pile foundation construction, a certain number of existing pile foundations already exist on the site, requiring the insertion of additional piles to fill the gaps. Current research on pile foundation positioning primarily focuses on using instruments to locate existing pile foundations. For example, existing technology CN 115616005A relates to a non-destructive positioning method and device for existing pile foundations. This method employs electromagnetic waves of different frequencies in two stages to perform non-destructive and precise positioning of the pile foundations in the test area, thereby accurately locating the location of pile foundation fractures and the distribution of reinforcing steel, reducing damage to the pile foundation structure in subsequent construction. Another example is existing technology CN114718105A, which relates to a pile foundation layout method and its verification method applied to pile foundations with existing pile foundations. This effectively avoids construction at existing pile foundation locations, ensuring project quality, and simultaneously verifies the rationality of the pile foundation layout. If unreasonable, the pile foundation positions can be adjusted in time to avoid causing large eccentric bending moments in the building. However, these patents only address how to detect the location of existing pile foundations; research on methods for simultaneously conducting denser pile foundation construction during detection is not addressed.

[0004] For the reasons mentioned above, how to predict the location of pile foundations during the pile driving process when existing pile foundations exist is an urgent problem to be solved. Summary of the Invention

[0005] To address the shortcomings in existing research, the purpose of this invention is to provide a construction method for detecting and avoiding obstacles in the original pile foundation during the intensified construction process. This method improves the efficiency of pile foundation intensification construction, ensures construction quality, avoids collisions that damage existing pile foundations, and allows for adjustments to the pile foundation layout based on the detection results, facilitating the identification of the most suitable location for additional piles.

[0006] To achieve the above-mentioned technical effects, the present invention is implemented through the following solution.

[0007] The construction process for supplementary piles under existing pile foundation conditions includes the following steps: Obtain the coordinate system of the original pile foundation construction to determine the pile driving information of the existing pile foundation; At the location where the pile needs to be added, after the precast pile foundation is driven to the first set position, the pile body is pulled out, and a detection component is set at the lower end of the pile body. Through the measuring tube and the first detection component inside it, the surrounding environment of the detection point is obtained by rotation detection, and a ground radar detection record map is drawn. Based on the ground-penetrating radar detection record, determine whether to continue pile driving or re-pile; If pile driving continues, when the precast pile foundation is driven to the second set position, the coordinates of the original pile foundation at the second set position and the distribution of the original pile foundation on the periphery are detected by the measuring tube and the second detection component inside it. Based on the detection data, the pile driving scheme of the supplementary pile foundation is set until the pile driving is completed.

[0008] As a further improvement of the present invention, the pile driving information of the existing pile foundation includes at least the original as-built drawings and the original pile foundation location.

[0009] As a further improvement of the present invention, it also includes obtaining the construction coordinate system of the original pile foundation, the theoretical coordinates of the original pile foundation, and the deep burial information of the original pile foundation.

[0010] As a further improvement of the present invention, it also includes using the existing pile foundation driving information to determine the positional relationship between the supplementary pile foundation and the original pile foundation, the length of the supplementary pile, the driving depth of the supplementary pile, and the detection components.

[0011] As a further improvement of the present invention, the depth of the first set position is at least 3 times the pile diameter in the supplementary pile foundation; the depth of the second set position is at least 5 times the pile diameter in the supplementary pile foundation.

[0012] As a further improvement of the present invention, after the precast pile foundation is driven to the first set position to complete the first pile driving, the first detection component composed of deep earth radar is assembled on the bottom of the precast pile foundation.

[0013] As a further improvement of the present invention, the first detection component includes a transmitting unit and a receiving unit located on the same horizontal cross section of the measuring tube, and in the rotation detection, the transmitting unit and the receiving unit are always parallel and the distance between them is fixed.

[0014] As a further improvement of the present invention, in the rotation detection, the rotation angle of each rotation is 10° to 20°, and the number of rotations is not less than 10.

[0015] As a further improvement of the present invention, the second detection component includes a single-hole receiving unit and a single-hole transmitting unit located at the top and bottom of the measuring tube, both of which are connected to the terminal device via an aerial antenna and a fixed pulley.

[0016] As a further improvement of the present invention, the second detection component determines whether the precast pile foundation driving is abnormal by detecting whether there is magnetic material, and the single hole receiving unit and the single hole transmitting unit are both assembled at the same height as or lower than the precast pile foundation and the supplementary pile foundation.

[0017] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a construction method for simultaneous pile driving and pile foundation detection. By using the original construction coordinate system, the theoretical coordinates of the original pile, and the original pile depth, a safe location for the supplementary pile can be initially located. The initial depth of the supplementary pile can be determined using the original pile depth from the original construction plan. The use of the pile hole extracted after pile driving avoids the need for extensive on-site drilling experiments as with ground-penetrating radar. By using a dipole antenna to emit electromagnetic waves perpendicular to the borehole, the reflection of radar signals at interfaces of different media can be used to locate reflecting targets. Furthermore, the ferromagnetic metal conductor of the original pile's reinforcing cage generates electromagnetic induction during radar wave operation, resulting in a strong electromagnetic field. The radar uses reflection to detect the location of nearby piles. By rotating the T-antenna and R-antenna at the bottom of the pile, it ensures that the radar recording curve can be measured 360 degrees below the pile, thus ensuring that the actual position of the original pile will not affect the pile densification process. The ground-penetrating radar used at the bottom of the pile can reflect ferromagnetic materials within a depth range of 3 to 5 times the pile diameter, while the borehole radar has an effective detection radius of 3 to 4 meters in soil and rock layers below the groundwater level. This can significantly reduce the probability of pile collision, improve the efficiency of pile densification construction, ensure construction quality, avoid collision damage to existing piles, reduce the difficulty of pile densification construction, and both the ground-penetrating radar system and the borehole radar system can be reused.

[0018] This invention proposes a novel method for pile foundation detection and reinforcement construction, addressing issues such as original pile misalignment, the need for reconstruction, and pile foundation densification. This method utilizes ground-penetrating radar (GPR) at the pile bottom for downward metal detection, combined with in-hole ground-penetrating radar (BPR) to detect the location of nearby piles using single-hole reflection technology. This ensures the quality of the reinforcement construction while enabling the prediction of the original pile position during the reinforcement process, facilitating subsequent pile foundation densification work. Furthermore, it improves construction safety, increases efficiency, and significantly shortens the construction period. In addition, the detection materials can be recycled, reducing the environmental impact of pile foundation densification construction. Attached Figure Description

[0019] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the implementation process of a preferred embodiment of the present invention; Figure 2 This is a schematic diagram of step 4 of a preferred embodiment of the present invention, in which the transmitting and receiving antennas are parallel and placed at the bottom of the pile; Figure 3 This is a schematic diagram illustrating the use of ground-penetrating radar for detection in step 5 of a preferred embodiment of the present invention; Figure 4 This is a schematic diagram of the single-aperture reflection technology in step 8 of a preferred embodiment of the present invention; In the picture: 1101. Precast pile foundation; 1102. Transmitting antenna; 1103. Receiving antenna; 1201. Original pile; 1301. Single-hole radar transmitting antenna; 1302. Single-hole radar receiving antenna; 1303. Antenna in hole; 1304. Fixed pulley; 1305. Main system; 1306. Computer program. Detailed Implementation

[0020] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0021] See attached document Figure 1-4 As shown, the pile foundation supplementation construction process under existing pile foundation conditions in this invention includes the following steps: Obtain the coordinate system of the original pile foundation construction to determine the pile driving information of the existing pile foundation; Specifically, this process involves obtaining at least the preliminary location of the original pile foundations as determined in the original as-built drawings. Based on the detection results from the detection components and the original pile foundations, the location, driving depth, driving length, and length of the replacement piles, as well as the detection components, are determined. Simultaneously, the positional relationship between the replacement piles and the original pile foundations is calculated to provide basic information such as avoidance mechanisms for later construction. This, in turn, provides relevant parameters for the replacement pile process, preventing issues such as pile collisions.

[0022] At the location where the pile needs to be added, after the precast pile foundation is driven to the first set position, the pile body is pulled out, and a detection component is set at the lower end of the pile body. Through the measuring tube and the first detection component inside it, the surrounding environment of the detection point is obtained by rotation detection, and a ground radar detection record map is drawn. In this embodiment, the depth of the first set position is at least 3 times the diameter of the pile in the supplementary pile foundation; the depth of the second set position is at least 5 times the diameter of the pile in the supplementary pile foundation.

[0023] In this embodiment, three times the pile diameter at the first set position is the minimum detection depth for the bottom-penetrating radar to detect downwards. Similarly, five times the pile diameter at the second set position is the optimal range for horizontal detection by the borehole radar. Its advantage is that the radar records are clearer when digitally filtered, making it easier to draw a geological radar detection record map and find the specific location of the nearby original piles.

[0024] In this embodiment, after the precast pile foundation is driven to the first predetermined position to complete the initial pile driving, a first detection component consisting of radar is assembled at the bottom of the precast pile foundation. By detecting and constructing the precast pile foundation simultaneously, the construction plan for the final supplementary pile foundation is ensured to meet the requirements.

[0025] Based on the ground-penetrating radar detection record, determine whether to continue pile driving or re-pile; If pile driving continues, when the precast pile foundation is driven to the second set position, the coordinates of the original pile foundation at the second set position and the distribution of the original pile foundation on the periphery are detected by the measuring tube and the second detection component inside it. Based on the detection data, the pile driving scheme of the supplementary pile foundation is set until the pile driving is completed.

[0026] In this embodiment, 3 times the pile diameter means 3 times the diameter of the driven pile. For example, in a certain project, the pile diameter is 600mm, so 3 times the pile diameter is 1.8m.

[0027] In this embodiment, the second detection component determines whether the precast pile foundation driving is abnormal by detecting whether there is magnetic material, and the single-hole receiving unit and the single-hole transmitting unit are both assembled at the same height as or lower than the precast pile foundation and the supplementary pile foundation.

[0028] The detailed steps of the construction process in this embodiment are as follows: S01. Carry out preparatory work before construction, such as determining the original construction coordinate system, the original theoretical coordinates of the piles, and the original pile embedment depth based on the existing completed structure. S02. Prepare the relevant equipment for pile driving construction and put the pile driver in place; S03. Initially drive the pile to a depth 3 times the pile diameter above the original pile depth; S04. Slowly pull out the sunken pile, then place the transmitting and receiving antennas of the ground penetrating radar parallel to the pile end, and move it to the bottom with the pile, and prepare for detection. S05. Use ground-penetrating radar antennas to probe the original pile downwards. Rotate the two antennas clockwise around the center of the pile bottom at a certain angle to repeatedly probe. After completion, perform digital filtering on the radar records and draw an address radar detection record map. S06. If the radar detection record shows an abnormality below, return to step 1 to redetermine the location of the replacement pile; if the detection record shows no abnormality, pull out the pile body equipped with the detection radar antenna again and proceed to step 7. S07. Start the pile driver and continue driving the pile. Slowly drive the pile into a depth of 5 times the pile diameter and then stop driving the pile. S08. Pull out the pile body, drill a hole at the location and insert a PVC pipe, place the transmitting and receiving antenna of the drilling radar in the PVC pipe and extend it to the bottom, measure the specific location coordinates of the original pile in the horizontal direction by moving it downwards, and process the distribution of the original pile foundation near the detection point based on the test data. S09. After the pile foundation detection work is completed, the PVC pipe and drilling radar are retrieved, and the piles are driven downward to carry out pile foundation densification construction. S10. After the entire pile is constructed, repeat the above detection and densification steps for the next densification location, and carry out pile foundation detection and pile foundation densification (i.e., supplementary pile) construction work; for special locations, repeated drilling detection can be carried out to achieve the purpose of precise construction.

[0029] Through the above steps, the effects of the present invention are as follows: 1. In addition to using two detection components, the most important aspect of this invention is the development of a pile driving technology for predicting the location of existing pile foundations and comprehensively avoiding obstacles during pile driving. This avoids damage to existing pile foundations caused by the continued construction of new pile foundations, ensuring the smooth implementation of the new pile foundation project. In conventional testing, it is rare to find a method that simultaneously drives piles and detects the location of nearby pile foundations. Therefore, this invention fills the gap in the existing technology for simultaneous pile driving and detection, making the construction of densification and correction more complete.

[0030] 2. The most significant difference between the piling construction process in this invention and the existing technology is that a section of the pile needs to be driven first. The radar at the bottom of the pile is used to detect the area below and determine if there is a risk of pile driving. If there is no risk, the pile is driven for another section. After the pile is pulled out, the position of the existing pile foundation nearby is detected to locate the old pile. This allows the most suitable pile driving position to be found.

[0031] 3. In this invention, ground-penetrating radar and borehole radar systems are utilized underground and combined with pile location detection. The radar antenna is installed at the bottom of the pile, and the borehole radar system is installed using the hole formed after pile extraction, achieving the effect of not only avoiding contact with the pile but also adjusting to the optimal pile position.

[0032] 4. In this invention, precast pile foundations are used for early detection of supplementary piles, and radar detection is used in conjunction with this. Then, the supplementary pile foundations are adjusted according to the construction plan of the precast pile foundations, and the problematic ones are adjusted to obtain a safe construction plan for the supplementary pile foundations.

[0033] The present invention is used in a specific classified project, as follows: A project is planned to be carried out on existing pile foundations that have already been constructed. The pile top elevation is -10.4m, the pile length is 37m, the original ground elevation is +4.5m, and the existing pile spacing is approximately 3.8m. Deep-drive piles were originally used. Due to increased load and the fact that the existing pile foundations have already been completed, it is necessary to drive additional piles into the previously completed pile area. The piling work is challenging due to the influence of the old pile foundations. Uncontrollable factors such as soil displacement caused by the original pile foundations have led to some pile misalignment, making it easy for the new piles to collide with the existing piles; positioning is also difficult, and any collision could damage the pile foundations. Therefore, this project will employ a pile foundation detection and densification method based on the existing pile foundation conditions for pile driving operations.

[0034] Specifically, the construction method for pile foundation detection and pile densification in this embodiment includes the following steps: Step 1: Combining Figure 1 As shown, in step S01, preparatory work before construction is carried out, including initially determining the location of the old piles based on the original as-built drawings, determining the positional relationship between the replacement piles and the original piles, as well as the length and driving depth of the replacement piles, and the ground-penetrating radar system and borehole radar system used for detection, etc.

[0035] Step 2: Combining Figure 1 As shown, in step S02, the relevant equipment for pile driving is prepared, the static pressure machine is transported to the corresponding position, and the corresponding adjustment work is carried out with the help of the hydraulic device of the equipment itself, while preparing for pile driving.

[0036] Step 3: Combining Figure 1As shown, in step S03, according to the determined pile foundation densification location, the PHC pipe pile is pressed to 1.8m above the original pile depth using a static pressure machine in accordance with the standard construction steps, and preparations are made for positioning and measurement after pile extraction.

[0037] Step 4: Combining Figure 2 As shown, in step S04, a hydraulic press is first used to slowly pull out the precast pile body of the sunken pile foundation. The first detection component is then assembled at the bottom of the supplementary pile foundation 1101. Next, the transmitting antenna 1102 (i.e., the transmitting unit of the first detection component) and the receiving antenna 1103 (i.e., the receiving unit of the first detection component) of the ground-penetrating radar are separated and placed parallel to each other at the pile end 1101, as shown. Figure 2 As shown, it enters the bottom of the pile hole along with the pile, preparing to probe the original pile's burial depth directly downwards.

[0038] In this embodiment, firstly, both the radar transmitting and receiving antennas are welded to the bottom of the supplementary pile foundation. Secondly, the control component of the entire detection assembly is located inside the supplementary pile foundation to avoid damage during pile driving. Finally, in practical use, the EKKOPRO ground-penetrating radar system manufactured by Sensor & Software, Canada, can be used for the two radar antennas to rotate and detect at the center of the pile bottom surface.

[0039] Step 5: Combining Figure 2 As shown, in step S05, the downward transmission signal unit 1204 of the ground-penetrating radar antenna (i.e., the single-hole transmission unit of the second detection component) is used to detect whether the original pile is in the encrypted position, such as... Figure 3 As shown. Manually operated, the precast pile 1101 is rotated from a given starting position to penetrate and probe the original pile 1201 located within the construction area. Using transmitting antenna 1102 and receiving antenna 1103, a rotating device is simultaneously used to rotate the transmitting and receiving antennas clockwise. During rotation, the transmitting and receiving antennas remain parallel and at a constant distance, thus scanning and probing the pile bottom at different angles. Each antenna rotation is 10-20° to ensure at least 10 probes are performed at the pile bottom. After detection, the radar records are digitally filtered to create a ground-penetrating radar (GPR) detection record map.

[0040] At this time, refer to the appendix Figure 4 As shown, the second detection component includes a single-hole receiving unit 1302 and a single-hole transmitting unit 1301 located at the top and bottom of the measuring tube, respectively. Both are connected to the terminal device (i.e., the host system 1305) via an aerial antenna 1303 and a fixed pulley 1304, and then input into a computer program 1306. In this embodiment, the second detection component is specifically located near the construction location, such as in a dug detection pit, and then performs detection on the area around the detection pit.

[0041] Step 6: Combining Figure 1 As shown, in step S06, based on the radar record obtained from the ground-penetrating radar inversion, it is determined that: when an abnormal ferromagnetic substance 1203 appears directly below the densification location, it indicates that the original pile offset position is below the densification pile to be constructed. Continuing to drive the pile will result in a pile collision, and the location of the supplementary pile needs to be re-determined; if there is no ferromagnetic substance directly below the densification location, the densification pile equipped with the ground-penetrating radar antenna will be pulled out again, and the next step will be carried out.

[0042] Step 7: Combining Figure 1 As shown, in step S07, after the precast pile is pulled out, the transmitting antenna 1102 and receiving antenna 1103 of the ground-penetrating radar antenna are removed. Then, the pile is driven again, and the static pressure machine is started to continue driving the pile vertically downward. During the pile driving process, attention should be paid to observation and correction at any time to keep the pile body vertical at all times. When the precast pipe pile continues to be driven into the ground by 5 times the pile diameter, i.e., 3m, the pile driving is stopped.

[0043] Step 8: Combining Figure 1 As shown, in step S08, after the driven and encrypted pile foundation 1203 is pulled out again, the two antennas of the drilling radar (i.e., the single-hole radar transmitting antenna 1301 and the single-hole radar receiving antenna 1302) are placed in the same PVC pipe 1303. Based on the property that the dipole antenna can transmit and receive in 360 degrees of space, the specific position coordinates of the original pile in the horizontal direction are measured by moving it downward.

[0044] Step 9: Combining Figure 1 As shown, in step S09, the specific location coordinates of the original pile are clearly detected. After the pile foundation detection work is completed, the static pressure pile is used to continue driving the pile downwards to carry out the pile driving operation for pile foundation densification construction.

[0045] Step 10: Combining Figure 1 As shown, in step S10, after the entire densification pile is completed, steps (3) to (9) are repeated sequentially for the next densification location, that is, the above steps of pile driving, detection, re-pile driving, and re-detection are repeated to carry out the construction work of pile foundation detection and densification; if it is necessary to accurately detect the precise location of a certain pile foundation, the special location can be repeatedly drilled to achieve the purpose of accurate construction; in this way, all original pile locations within the range are detected until the pile foundation densification work is completed.

[0046] In summary, the embodiments of the present invention describe the construction method applied to pile foundation detection and pile foundation densification. While ensuring the quality of pile densification construction, it can predict the original pile position of the existing pile foundation during the pile densification process, effectively ensuring the quality of pile driving, avoiding pile collision problems, providing convenience for subsequent pile foundation densification work, and improving construction efficiency and shortening the construction period.

[0047] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A construction technique for supplementing piles in existing pile foundations, characterized in that, Includes the following steps: Obtain the coordinate system of the original pile foundation construction to determine the pile driving information of the existing pile foundation; At the location to be supplemented with piles, after the precast pile foundation is driven to the first set position, the pile body is pulled out, and the first detection component is set at the lower end of the pile body. Through the measuring tube and the first detection component inside it, the surrounding environment of the detection point is obtained by rotation detection, and a ground radar detection record map is drawn. Based on the ground-penetrating radar detection record, determine whether to continue pile driving or re-pile; If pile driving continues, when the precast pile foundation is driven to the second set position, the coordinates of the original pile foundation at the second set position and the distribution of the original pile foundation on the periphery are detected by the measuring tube and the second detection component inside it. Based on the detection data, the pile driving scheme of the supplementary pile foundation is set until the pile driving is completed. The first detection component includes ground penetrating radar and the second detection component includes borehole radar. The specific pile driving scheme involves: initially locating the safe position of the supplementary pile based on the original construction coordinate system, the theoretical coordinates of the original pile, and the original pile depth; determining the initial burial depth of the supplementary pile using the original pile burial depth from the original construction scheme; utilizing the pile hole extracted after the pile foundation is driven in; using a dipole antenna to emit electromagnetic waves in a direction perpendicular to the borehole, and identifying the reflecting target based on the reflection of radar signals at the interface of different media; utilizing the ferromagnetic metal conductor of the original pile's reinforcing cage to generate electromagnetic induction during radar wave operation, resulting in a strong reflection effect to detect the location of nearby pile foundations; the ground-penetrating radar used at the pile bottom can reflect ferromagnetic materials within a depth range of 3 to 5 times the pile diameter, while the detection radius of the borehole radar is 3 to 4 meters in soil and rock layers below the groundwater level.

2. The pile foundation supplementation construction technology under existing pile foundation conditions according to claim 1, characterized in that, The existing pile foundation driving information includes at least the original as-built drawings and the original pile foundation locations.

3. The pile foundation supplementation construction technology under existing pile foundation conditions according to claim 2, characterized in that, It also includes obtaining the construction coordinate system of the original pile foundation, the theoretical coordinates of the original pile foundation, and the depth information of the original pile foundation.

4. The pile foundation supplementation construction technology under existing pile foundation conditions according to claim 2, characterized in that, It also includes using existing pile driving information to determine the positional relationship between the supplementary pile foundation and the original pile foundation, the length of the supplementary pile, the driving depth of the supplementary pile, and the detection components.

5. The pile foundation supplementation construction technology under existing pile foundation conditions according to claim 1, characterized in that, The depth of the first designated position is at least 3 times the diameter of the pile in the supplementary pile foundation; the depth of the second designated position is at least 5 times the diameter of the pile in the supplementary pile foundation.

6. The pile foundation supplementation construction technology under existing pile foundation conditions according to claim 1, characterized in that, After the precast pile foundation is driven to the first set position to complete the first pile driving, the first detection component composed of radar is assembled on the bottom of the precast pile foundation.

7. The pile foundation supplementation construction technology under existing pile foundation conditions according to claim 1, characterized in that, The first detection component includes a transmitting unit and a receiving unit located on the same horizontal cross section of the measuring tube, and in the rotation detection, the transmitting unit and the receiving unit are always parallel and the distance between them is fixed.

8. The pile foundation supplementation construction technology under existing pile foundation conditions according to claim 7, characterized in that, In the rotation detection, the rotation angle for each rotation is 10° to 20°, and the number of rotations is no less than 10.

9. The pile foundation supplementation construction technology under existing pile foundation conditions according to claim 1, characterized in that, The second detection component includes a single-hole receiving unit and a single-hole transmitting unit located at the top and bottom of the measuring tube, both of which are connected to the terminal device via an aerial antenna and a fixed pulley.

10. The pile foundation supplementation construction technology under existing pile foundation conditions according to claim 9, characterized in that, The second detection component determines whether the precast pile foundation driving is abnormal by detecting whether there is magnetic material, and the single hole receiving unit and the single hole transmitting unit are both assembled at the same height as or lower than the precast pile foundation and the supplementary pile foundation.

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