Pile manufacturing method based on intelligent control vibroflotation

Abstract

The present application relates to the technical field of foundation operation vibroflotation construction, in particular to a pile making method based on intelligent control vibroflotation, which repeatedly carries out the processes of lifting the vibrator, filling the material and back inserting and leaving vibration according to the length of the encryption section of the pile hole, until the pile is formed; specifically, it includes presetting the vibrator, back inserting and detecting, leaving vibration and detecting, and depth detecting; the pile making method disclosed in the present application controls the processes of lifting, back inserting and leaving vibration of the vibrator, accurately judges the current state of the vibrator, adjusts the action of the vibrator, and thus achieves more standardized pile making operation, makes the pile making process more automated and intelligent, and makes the pile making effect more standardized and reliable, and improves the operation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation operation vibration impact construction, and in particular to a pile making method based on intelligent control vibration impact. Background Art

[0002] The quality of vibro-compaction construction is crucial to the foundation safety of hydropower projects. The vibro-compaction process consists of three steps: hole creation, hole construction, and pile construction. Vibro-compaction piles use vibration to squeeze sand, gravel, clay, and other materials into holes or cracks in weak foundations with excessive pores and cracks. These materials then combine with the surrounding soil to form a new composite foundation. This vibro-compaction pile method is suitable for foundations consisting of miscellaneous fill, loose sand, clay, and silt. Foundations treated with vibro-compaction piles fully utilize the strength of the natural foundation, ensuring uniform foundation strength. Vibro-compaction can quickly drain and consolidate weak foundations, enhancing foundation strength, and improving bearing capacity and liquefaction resistance, thereby increasing foundation stability.

[0003] On-site pile production relies heavily on experience, without standardized, procedural procedures. The quality of pile production depends entirely on the worker's experience. Even experienced workers struggle with unusual strata, where filler easily accumulates at the hole mouth, current drops during vibration, and reverse insertion encounters resistance.

[0004] It can be seen that the existing vibro-pile making process still has room for improvement. The process method needs to be optimized and improved to achieve more standardized operation and make the pile making results more reliable. Therefore, it is necessary to propose a more reasonable technical solution to solve the technical problems existing in the existing technology. Summary of the Invention

[0005] In order to overcome at least one of the defects mentioned above, the present invention proposes a pile-making method based on intelligent control vibration, which performs precise control during the vibration pile-making process to improve control accuracy, reduce operating errors, reduce labor intensity, and ensure the quality of vibration construction.

[0006] In order to achieve the above-mentioned purpose, the pile making method disclosed in the present invention can adopt the following technical solutions:

[0007] The pile-making method based on intelligent control vibration is to repeatedly lift the vibrator and fill the material, then reversely insert and vibrate the material to achieve step-by-step compaction according to the length of the pile hole density section, until the pile is formed. Specifically, it includes:

[0008] Preset vibrator: Set the vibrator at the designated vibration position for initial filling;

[0009] Reverse insertion and detection: reverse the insertion of the vibrator and reduce the current, and monitor the vibrator current synchronously until I0≥I f , at this time the vibrator stops descending and is at the vibration retention position;

[0010] Keep vibrating and detect: monitor the vibrator current, when I l ≤I0<I lmax Start to retain the vibration and start the retention timing synchronously. When t l ≥t l0 The vibration retention ends at this time to complete the vibration retention operation at the current vibration retention position;

[0011] Depth detection: Perform vibration detection step by step and detect the vibration depth. When h≤h0, pile making is completed;

[0012] Among them, I0 is the current of the vibrator, I f is the reverse current of the vibrator, I l is the minimum allowable vibration current of the vibrator, I lmax is the maximum allowable residual vibration current, t l is the current retention time, t l0 is the preset vibration retention time, h is the current vibration retention depth, and h0 is the preset final hole vibration retention depth.

[0013] The pile making method disclosed above adopts a vibrator to perform pile making operations, and performs real-time detection and precise control on the working process of the vibrator to ensure that the working process of the vibrator is safe and controllable, and the pile making effect is stable and reliable.

[0014] Furthermore, the present invention utilizes a vibrator for pile formation, tailored to the actual construction environment. Here, an optimization is presented, citing a feasible option: when presetting the vibrator, the post-hole depth is used as the initial vibration depth. This approach begins with vibration at the bottom of the pile hole and continues upwards, ultimately achieving pile formation.

[0015] Furthermore, in the method disclosed in the present invention, the process control of the vibrator during reverse insertion and descent also includes more scenarios. Here, optimization is performed and one feasible option is given: in reverse insertion detection, if the current I0 of the vibrator is less than I f , the vibrator keeps descending and the tension F of the vibrator is monitored synchronously. When the tension F<F min When t s ≥t max When this solution is adopted, considering that the current of the vibrator is small and has not reached the reverse plugging current, and the tension of the vibrator has not reached the minimum allowable tension value, the vibrator should be stopped from descending and wait for adjustment. If it can be adjusted and the tension value reaches the minimum allowable tension value, it can continue to descend. Otherwise, it is considered that the reverse plugging and descending process of the vibrator does not meet the standards, and it should be lifted for adjustment and reverse plugged again to ensure that each reverse plugging operation is standardized and reliable.

[0016] Where F is the current tension of the vibrator, Fmin is the minimum allowable tension, t s is the dwell time of the vibrator, t max The maximum permitted stay time.

[0017] Furthermore, in the above process, it can be seen that the state requirement of the vibrator during the reverse insertion and descending process is to ensure that the tension meets the standard. Therefore, when the tension F of the vibrator is greater than F min , and t s <t max The vibrator keeps descending and keeps synchronous reverse insertion detection until the vibrator descends to the vibration retention position.

[0018] Furthermore, when the vibrator is lifted for adjustment, the lifting distance should reach a certain range to meet the requirements of adjustment and reverse insertion and lowering again. Here, optimization is carried out and one of the feasible options is given: when the vibrator is lifted, the lifting height h≥h0 each time, and then the vibrator is reversed and lowered and reverse insertion detection is performed simultaneously; when such a solution is adopted, the lifting height of the vibrator is greater than the lifting height of its pile making, which meets the requirements of adjusting the state of the vibrator.

[0019] Wherein, h is the temporary raising height of the vibrator, and h0 is the raising height of the pile made by the vibrator.

[0020] Furthermore, in the present invention, there are many situations in which the current value of the vibrator exists during the vibration retention process. The state of the vibrator should be adjusted accordingly according to different situations. Here, one of the situations is cited for targeted adjustment: when I0≥I lmax When this solution is adopted, it means that the current value of the vibrator is greater than the maximum current value of the vibration retention operation, and the vibrator is not suitable for continued vibration. Therefore, it should be lifted and then reversed and adjusted to achieve more suitable conditions before continuing vibration.

[0021] Furthermore, in the present invention, if the current value of the vibrator is too small to be suitable for continued vibration, even if it is adjusted to achieve a more suitable state, specifically, here is a feasible option: when the vibration detection is performed, if I0≤I l , timing, when t a ≥t b At the same time, lift the vibrator up by h and add filler to the pile hole; when using this operation, it is believed that the current value of the vibrator is too small to achieve the effect of retaining vibration, and the state should be adjusted before retaining vibration.

[0022] Among them, t a To keep I0≤I l The duration, t b To allow I0≤I without additional filler l The maximum duration of .

[0023] Furthermore, during the vibration retention process, if it is determined that the state of the vibrator is not optimal but it is in the process of adjustment, the vibration retention can be resumed after the vibrator is adjusted. Here, we optimize and give the following specific feasible options: When I0≤I l When t a <t b , then when I0>I l When this solution is adopted, it is assumed that the current value of the vibrator is relatively small, but it is adjusted to meet the standard within a period of time, so the vibration can be restored, avoiding the need for reverse insertion after re-lifting and increasing the operation procedures.

[0024] Furthermore, in the present invention, the vibration retention time t l Accumulate the accumulated vibration time, and make sure it is greater than the preset value. This will help you make a reasonable judgment on the working time of the vibrator and ensure the quality of the vibration.

[0025] Furthermore, as the vibration retention process progresses and the pile construction progresses, the automatically set parameters of the vibrator will change accordingly. Here, we propose an optimization and a feasible option: upon completion of the vibration retention operation at the current retention position, the designated retention position in the pile hole is updated and the vibrator position is reset. In this solution, the updated designated retention position is the difference between the length of the reinforced section and the current retention depth.

[0026] Compared with the prior art, some of the beneficial effects of the technical solution disclosed in the present invention include:

[0027] The pile making method disclosed in the present invention controls the lifting, reverse insertion and vibration retention processes of the vibrator, accurately judges the current state of the vibrator, and adjusts the action of the vibrator, thereby achieving a more standardized pile making operation, making the pile making process more automated and intelligent, the pile making effect more standardized and reliable, and improving working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only represent some embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 Schematic diagram of the pile making method.

[0030] Figure 2 The depth variation curve of pile making using this method reflects the change of residual compaction depth over time.

[0031] Figure 3This is a curve chart of the change in the depth of artificial piles, reflecting the change in the residual compaction depth over time.

[0032] Figure 4 The upper curve is the variation curve of the retention depth and the lower curve is the variation curve of the retention current.

[0033] Figure 5 This is the corresponding change of the vibration depth and current when the vibration stops automatically due to insufficient current during the vibration process. DETAILED DESCRIPTION

[0034] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0035] In view of the fact that the existing vibratory pile making mainly relies on manual experience and has no standardized and unified operation method, resulting in low pile making efficiency and uneven pile making effects, optimization and improvement are made through embodiments herein to overcome the defects in the existing technology.

[0036] Example

[0037] like Figure 1 As shown, this embodiment provides a pile-making method based on intelligent control vibration. According to the length of the dense section of the pile hole, the vibrating impactor is repeatedly lifted up and the filling material is filled and reversely inserted and vibrated to achieve step-by-step compaction until the pile is formed. In this embodiment, the dense section length is set to 0.3m. Specifically, the method includes:

[0038] S1: Preset vibrator: Set the vibrator at the designated vibration position for initial filling;

[0039] S2: Reverse insertion and detection: reverse the insertion of the vibrator and reduce the current, and monitor the vibrator current synchronously until I0≥I f , at this time the vibrator stops descending and is at the vibration retention position;

[0040] S2: Keep vibrating and detect: monitor the vibrator current, when I l ≤I0<I lmax Start to retain the vibration and start the retention timing synchronously. When t l ≥t l0 The vibration retention ends at this time to complete the vibration retention operation at the current vibration retention position;

[0041] S4: Depth detection: Perform vibration retention step by step and detect the vibration retention depth. When h≤h0, the pile making is completed.

[0042] Among them, I0 is the current of the vibrator, I f is the reverse current of the vibrator, in this embodiment, I f =250A, I lis the minimum allowable vibration current of the vibrator. In this embodiment, I l =225A, I lmax is the maximum allowable residual vibration current. In this embodiment, I lmax =300A, t l is the current retention time, t l0 is the preset vibration retention time. In this embodiment, t is set for the pile density layer. l0 =30s, set t for a good bearing layer l0 =20s, h is the current vibration retention depth, and h0 is the preset final hole vibration retention depth.

[0043] The pile making method disclosed above adopts a vibrator to perform pile making operations, and performs real-time detection and precise control on the working process of the vibrator to ensure that the working process of the vibrator is safe and controllable, and the pile making effect is stable and reliable.

[0044] Preferably, this embodiment utilizes a vibrator for pile formation based on the actual construction environment. This embodiment optimizes and employs a feasible option: when presetting the vibrator, the post-hole depth is used as the initial vibration depth. This approach initiates vibration from the bottom of the pile hole and continues upwards, ultimately achieving pile formation.

[0045] In the method disclosed in this embodiment, the process control of the vibrator during reverse insertion and descent also includes more scenarios. Here, we optimize and give one feasible option: in reverse insertion detection, if the current I0 of the vibrator is less than I f , the vibrator keeps descending and the tension F of the vibrator is monitored synchronously. When the tension F<F min When t s ≥t max When this solution is adopted, considering that the current of the vibrator is small and has not reached the reverse plugging current, and the tension of the vibrator has not reached the minimum allowable tension value, the vibrator should be stopped from descending and wait for adjustment. If it can be adjusted and the tension value reaches the minimum allowable tension value, it can continue to descend. Otherwise, it is considered that the reverse plugging and descending process of the vibrator does not meet the standards, and it should be lifted for adjustment and reverse plugged again to ensure that each reverse plugging operation is standardized and reliable.

[0046] Where F is the current tension of the vibrator, F min is the minimum allowable tension, t s is the dwell time of the vibrator, t max The maximum permitted stay time.

[0047] Generally, the tension F is a real-time value, and the current real-time tension F range is 1.85t~22t. minThe reference range is 2t~4t, and in this embodiment, 3t is preferred. max The reference range is 20 to 40 seconds, and 30 seconds is preferred in this embodiment.

[0048] In the above process, it can be seen that the state requirement of the vibrator during the reverse insertion and descending process is to ensure that the tension meets the standard. Therefore, when the tension F of the vibrator is greater than F min , and t s <t max The vibrator keeps descending and keeps synchronous reverse insertion detection until the vibrator descends to the vibration retention position.

[0049] Preferably, when the vibrator is lifted up for adjustment, the lifting distance should reach a certain range to meet the requirements of adjustment and reverse insertion and lowering again. This embodiment is optimized and adopts one of the feasible options: when the vibrator is lifted up, the lifting height h≥h0 each time, and then the vibrator is reversed and lowered and reverse insertion detection is performed simultaneously; when such a scheme is adopted, the lifting height of the vibrator is greater than the lifting height of its pile making, which meets the needs of adjusting the state of the vibrator.

[0050] Among them, h is the temporary raising height of the vibrator, which can be set to h=1.5m in this embodiment, h0 is the pile-making raising height of the vibrator, which is set to h0=0.5m for the pile-making density layer and h0=1m for the good bearing layer in this embodiment.

[0051] In this embodiment, there are many situations in the current value of the vibrator during the vibration retention process. The state of the vibrator should be adjusted accordingly according to different situations. This embodiment adopts one of the situations for targeted adjustment: when I0≥I lmax When this solution is adopted, it means that the current value of the vibrator is greater than the maximum current value of the vibration retention operation, and the vibrator is not suitable for continued vibration. Therefore, it should be lifted and then reversed and adjusted to achieve more suitable conditions before continuing vibration.

[0052] In this embodiment, if the current value of the vibrator is too small to be suitable for continued vibration, even if it is adjusted to achieve a more suitable state, specifically, this embodiment adopts the following feasible option: when the vibration detection is performed, if I0≤I l , timing, when t a ≥t b At the same time, lift the vibrator up by h and add filler to the pile hole; when using this operation, it is believed that the current value of the vibrator is too small to achieve the effect of retaining vibration, and the state should be adjusted before retaining vibration.

[0053] Among them, t a To keep I0≤I l The duration, t b To allow I0≤I without additional filler lThe maximum duration of t b The reference range is 5 to 10 seconds, and 10 seconds is preferred in this embodiment.

[0054] Preferably, during the vibration retention process, if it is determined that the state of the vibrator is not optimal but it is in the process of adjustment, the vibration retention can be resumed after the vibrator is adjusted. Here, optimization is performed and a specific feasible option is given as follows: when I0≤I l When t a <t b , then when I0>I l When this solution is adopted, it is assumed that the current value of the vibrator is small, but it is adjusted to meet the standard within the time period, so the vibration can be restored, avoiding the need for reverse insertion after re-lifting and increasing the operation procedures.

[0055] In this embodiment, the vibration retention time t l The accumulated vibration duration is accumulated, and the accumulated vibration duration is greater than the preset value. This allows for reasonable judgment of the vibrator's operating time and ensures vibration quality. Generally, the vibration duration in each bottom layer is a fixed value. According to the distribution of the pile base, from the surface downward, it is marked as the 5th layer (rock layer), the 4th layer (clay layer), the 3rd layer (rock layer), the 2nd layer, and the 1st layer. The vibration duration of the 5th layer is fixed at 20 seconds, and the vibration duration of the 4th layer and below is fixed at 30 seconds.

[0056] As the vibration retention process progresses and the pile construction progresses, the automatically set parameters of the vibrator will change accordingly. Here, we propose an optimization method and a feasible option: upon completion of the vibration retention operation at the current retention position, the designated retention position in the pile hole is updated and the vibrator position is reset. In this approach, the updated designated retention position is the difference between the length of the reinforced section and the current retention depth.

[0057] Some of the examples listed here are used to illustrate the above disclosed pile making method.

[0058] like Figure 2 Figure 2 shows a schematic diagram of the pile depth during pile construction using this method. In the initial stages of pile construction, the compaction depth is maximum. As the vibration retention process progresses, the length of the compaction section within the pile hole gradually increases, while the depth to be compacted decreases. Except for a step change in the compaction depth caused by supplemental filler during the initial compaction process, the length of the compaction section increases gradually throughout the entire compaction process. The pile construction process proceeds reliably and at a uniform speed. Figure 3 The figure shows the variation curve of the depth of manual pile making, which shows that the depth of pile making fluctuates during the pile making process, which is not as stable and reliable as the present method. This shows that the present method is worse than manual pile making.

[0059] like Figure 4The figure shows the changes in retention depth and current. The upper curve shows the change in retention depth, and the lower curve shows the change in retention current. The design requires that after reaching the specified retention depth, the retention current should be between 225A and 300A. Retention should be completed once the designed retention time is reached, and then the retention should be gradually increased. This method achieves precise control and good consistency according to this standard. The system can automatically complete the retention process, whether it is a one-time retention or a mid-retention period with additional material. Figure 4 It reflects that during the intelligent pile making process, the system automatically and standardizedly completes the process of retaining vibration, lifting and re-inserting, and retaining vibration again. It can be seen that the current during retaining vibration is within the required range, the retaining vibration time meets the design requirements, and the encrypted section length meets the requirements.

[0060] Figure 5 It reflects that during the vibration retention process, the system detects that the vibration retention current is insufficient (less than 225A) and automatically interrupts the vibration retention process. The relatively smooth curve is the vibration retention depth change curve, and the turbulent change is the current change curve. Figure 5 It can be seen that after feeding by lifting and reverse insertion, the current reaches the retention current and continues the retention until the cumulative retention time reaches 30s.

[0061] This pile-making method results in longer construction times and better quality. During intelligent pile-making, some piles take nearly the same amount of time as manual work, while others take longer than manual work. Intelligent pile-making strictly adheres to established standards, such as the duration of vibration and the length of the reinforced section. The entire pile-making process is strictly regulated, which also results in some piles taking longer than manual work. Particularly in areas with complex strata, the current during the vibration process is often less than the retention current, resulting in interrupted vibration. The system then raises the reverse interpolation material according to the standard and resumes vibration only when the retention conditions are met. Intelligent pile-making takes approximately 120 to 160 minutes, while manual pile-making generally takes 90 to 140 minutes. The table below shows the time required for this pile-making method to complete at selected pile locations.

[0062] Serial number Pile number Pile making time (min) 1 Z57-350 140 2 Z56-358 156 3 Z56-367 133 4 Z56-364 124 5 Z56-365 162 6 Z56-374 129

[0063] The above are the implementation methods listed in this embodiment, but this embodiment is not limited to the above optional implementation methods. Those skilled in the art can arbitrarily combine the above methods to obtain other various implementation methods. Anyone can derive other various implementation methods based on the inspiration of this embodiment. The above specific implementation methods should not be understood as limiting the scope of protection of this embodiment. The scope of protection of this embodiment should be based on the definition in the claims.

Claims

1. A pile-making method based on intelligent control vibration, which repeats the process of lifting the vibrator and then filling the pile with the filler and then inserting and vibrating the pile in reverse to achieve step-by-step compaction until the pile is formed. It is characterized by: include: Preset vibrator: Set the vibrator at the designated vibration position for initial filling; Reverse insertion and detection: reverse the insertion of the vibrator and monitor the current of the vibrator until I0≥I f , at this time the vibrator stops descending and is at the vibration retention position; Keep vibrating and detect: monitor the vibrator current, when I l ≤I0 lmax Start to retain the vibration and start the retention timing synchronously. When t l ≥t l0 The vibration retention ends at this time to complete the vibration retention operation at the current vibration retention position;​ Depth detection: Perform vibration retention step by step and detect the vibration retention depth. When h≤h0, the pile is completed; Among them, I0 is the current of the vibrator, I f is the reverse current of the vibrator, I l is the minimum allowable vibration current of the vibrator, I lmax is the maximum allowable residual vibration current, t l is the current retention time, t l0 is the preset vibration retention time, h is the current vibration retention depth, and h0 is the preset final hole vibration retention depth; In reverse insertion detection, if the vibrator current I0 f , the vibrator keeps descending, and the tension F of the vibrator is monitored synchronously. <F min When t s ≥t max When the vibrator is lifted up;​ Where F is the current tension of the vibrator, F min is the minimum allowable tension, t s is the dwell time of the vibrator, t max The maximum permitted stay time.

2. The pile making method based on intelligent control vibration according to claim 1, characterized in that: When presetting the vibrator, the hole depth after hole making is completed is used as the initial vibration depth.

3. The pile making method based on intelligent control vibration according to claim 1, characterized in that: When the tension of the vibrator F>F min , and t s <t max The vibrator keeps descending and keeps synchronous reverse insertion detection until the vibrator descends to the vibration retention position.

4. The pile making method based on intelligent control vibration according to claim 1 or 3, characterized in that: When lifting the vibrator, the height of each lift is h≥h0, and then the vibrator is reversed and lowered and reverse insertion detection is carried out simultaneously; Wherein, h is the temporary raising height of the vibrator, and h0 is the raising height of the pile made by the vibrator.

5. The pile making method based on intelligent control vibration according to claim 4, characterized in that: When I0≥I lmax When the vibrator is lifted up, 6. The pile making method based on intelligent control vibration according to claim 4, characterized in that: During vibration detection, if I0≤I l , timing, when t a ≥t b When the vibrator is lifted up, fill the pile hole with additional stuffing; Among them, t a To keep I0≤I l The duration, t b For feeding detection, I0≤I l The maximum duration of .

7. The pile making method based on intelligent control vibration according to claim 6, characterized in that: When I0≤I l When t a <t b , then when I0>I l Then the vibration is restored.

8. The pile making method based on intelligent control vibration according to claim 1, characterized in that: Vibration retention time t of the vibrator l Accumulate, and the accumulated vibration duration is greater than the preset value.

9. The pile making method based on intelligent control vibration according to claim 1, characterized in that: When the vibration retention operation at the current vibration retention position is completed, the designated vibration retention position of the pile hole is updated and the vibrator position is reset.

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