A pile driving method for improving the bearing capacity of a single pile

Abstract

The present invention relates to the field of building construction technology, and in particular to a piling method for improving the bearing capacity of a single pile, comprising: fixing a target single pile through a guide device; measuring the soil around the pile at the target piling position and obtaining the initial soil softness, and determining the initial falling speed of a pile hammer according to the initial soil softness; obtaining each actual single settlement depth of the target single pile, analyzing the actual single settlement depth, measuring the verticality of the single pile to obtain the actual target single pile verticality, and determining whether to adjust the initial falling speed according to the actual target single pile verticality to obtain a first falling speed; adjusting the initial piling frequency based on the situation that the settlement requirement is not met to obtain a first piling frequency, obtaining a second piling result based on the first piling frequency, and adjusting the piling method according to the second piling result. The present invention reduces damage to the soil around the pile by adjusting the falling speed and the piling frequency.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a piling method for improving the bearing capacity of a single pile. Background Art

[0002] The bearing capacity of a pile refers to the maximum axial static load that a single pile can support under certain conditions of pile top deformation. On the premise of ensuring the structural strength of the pile body, the bearing capacity of the pile mainly depends on the properties of the soil around the pile.

[0003] Chinese Patent Publication No.: CN101672034A discloses a vibrating pile driver and construction method for cast-in-place expanded bottom wedge-shaped reinforced concrete piles, comprising: (1) placing a pile mold casing with a flap pile shoe in place at a designated piling position; (2) starting the vibrating head to vibrate downward to drive the pile mold casing to the designated position; (3) injecting dry hard concrete solid filler such as CFG into the cavity of the wedge-shaped steel casing through a concrete feed port; (4) starting the vibrating head to vibrate and fill the dry hard solid Before filling, pull up the wedge-shaped steel casing by 0.2-1.0m at a rate of 0.5-1.4m / min9; (5) install a small rammer on the pile driver to ram the filling at the bottom of the casing to form an enlarged head; (6) lower the steel cage to the specified position by its own weight or vibration force; (7) restart the vibration of the vibrating head, pull the casing upward out of the ground, and at the same time fill the casing with concrete through the feed port to form the upper wedge-shaped pile body, finally forming an enlarged bottom wedge-shaped pile.

[0004] It can be seen that the prior art has the following problems: there is a lack of adjustment of the falling speed and the frequency of pile driving to reduce the damage to the soil around the pile. Summary of the invention

[0005] To this end, the present invention provides a piling method for improving the bearing capacity of a single pile, so as to overcome the problem in the prior art that the pile hammer causes great damage to the soil around the pile during piling, resulting in low bearing capacity of the single pile.

[0006] To achieve the above object, the present invention provides a piling method for improving the bearing capacity of a single pile, comprising:

[0007] The target single pile that has passed the initial bearing capacity test is fixed at the target piling position through the guide device;

[0008] Measuring the soil softness of the soil around the pile at the target piling position to obtain the initial soil softness, and determining the initial falling speed of the pile hammer according to the initial soil softness;

[0009] According to a preset initial piling interval, periodically piling the target single pile at the initial falling speed;

[0010] Acquire each actual single settlement depth of the target single pile, analyze any actual single settlement depth, and determine whether the settlement requirement is met according to the analysis result;

[0011] In the case where the settlement requirement is not met, the target single pile verticality is measured to obtain an actual target single pile verticality, and whether to adjust the initial falling speed according to the actual target single pile vertical angle to obtain a first falling speed;

[0012] A first piling result at the first falling speed is obtained, and based on a situation where the settlement requirement is not met, an initial piling frequency is adjusted to obtain a first piling frequency, a second piling result is obtained based on the first piling frequency, and the piling method is adjusted according to the second piling result, wherein the initial piling frequency is determined according to a historical piling frequency and the softness of soil at the target piling position.

[0013] Furthermore, the bearing capacity of the target single pile is detected to obtain the initial bearing capacity, the maximum falling speed of the pile hammer is limited according to the initial bearing capacity, and the initial falling speed of the pile hammer is estimated according to the initial soil softness.

[0014] Furthermore, any actual single settlement depth is obtained, and any actual single settlement depth is compared with a standard single settlement depth range to obtain a first comparison result, and it is determined whether to adjust the piling cycle or the initial falling speed according to the first comparison result.

[0015] Furthermore, each actual single settlement depth is measured, compared with several consecutive actual single settlement depths, and whether the piling is completed is determined based on the comparison result.

[0016] Furthermore, based on adjusting the piling cycle, actual single settlement depths in several piling cycles are obtained, the actual single settlement depths are analyzed to obtain a first analysis result, and it is determined whether to adjust the initial falling speed according to the first analysis result.

[0017] Furthermore, according to the situation that any single settlement depth is greater than the standard single settlement depth, the actual settlement depth group in the middle section of the piling cycle is obtained, and the actual settlement depth group in the middle section is analyzed to obtain the settlement grade, and it is determined whether to finally adjust the initial falling speed according to the settlement grade.

[0018] Furthermore, the actual target single pile verticality is obtained by detecting the target single pile verticality, and the actual target single pile verticality is compared with the standard target single pile verticality to determine whether to issue a target single pile verticality adjustment signal.

[0019] Furthermore, based on the situation that the verticality of the target single pile is not adjusted, the initial falling speed is adjusted according to the initial falling speed and the total settlement depth, and the falling speed after adjustment is the first falling speed.

[0020] Further, the pile driving hammer is operated to drive piles at the first falling speed to obtain a second piling result, and it is determined whether to adjust the initial piling frequency according to the second piling result to obtain a first piling frequency.

[0021] Further, a third piling result is obtained by piling based on the first piling frequency, and it is determined whether to adjust the piling mode according to the third piling result.

[0022] Compared with the prior art, the beneficial effect of the present invention lies in that the falling speed of the pile driver is limited by the initial bearing capacity, so that the impact force exceeding the maximum bearing capacity of the target single pile due to the excessively fast speed during the initial falling of the pile driver can be avoided, resulting in deformation or fracture of the target single pile. The initial falling speed of the pile driver is initially adjusted according to the measurement result of the initial soil softness around the target single pile, and the initial falling speed of the pile driver can be adjusted according to the initial soil softness around the target single pile. It can be avoided that due to the low soil softness, a larger falling speed of the pile driver is used, which easily causes the target single pile to deviate, and has a significant damage to the initial soil structure around the target single pile, affecting the construction progress, so that the pile driver is used to drive the target single pile at an appropriate falling speed to protect the initial soil structure around the pile.

[0023] Furthermore, the target single pile is fixed by a guide device, which ensures the verticality and positioning accuracy of the pile body, thereby improving the accuracy of piling. The initial falling speed of the pile hammer is determined according to the initial softness of the soil around the pile, so that the piling process is more in line with the actual geological conditions and the piling efficiency is improved. By real-time monitoring of the settlement depth of the target single pile, the piling parameters can be adjusted according to the actual settlement situation to ensure that the settlement requirements are met. For situations where the settlement requirements are not met, verticality measurement and falling speed adjustment are performed to effectively solve the construction quality problems caused by the inclination of the pile body. By optimizing the piling parameters and frequency, the energy consumption and material loss in the piling process are reduced, thereby saving construction costs. This method can quickly and accurately complete the piling operation, which is conducive to speeding up the progress of the project, shortening the construction period, and improving the bearing capacity of the target single pile.

[0024] Furthermore, by obtaining the initial bearing capacity of the target single pile, the maximum falling speed of the pile hammer can be more accurately limited to prevent damage to the pile body or insufficient bearing capacity caused by excessive falling speed, thereby ensuring the overall safety of the building structure. The falling speed of the pile hammer is limited according to the initial bearing capacity of the target single pile to avoid unnecessary over-pile driving and improve construction efficiency. By estimating the initial falling speed of the pile hammer, it is possible to better adapt to different soil conditions and make the pile driving process smoother and more efficient. Limiting the maximum falling speed of the pile hammer helps to reduce the impact on the pile body, prevent cracks or deformation in the pile body, and maintain the integrity of the pile body. By estimating and limiting the pile driving speed through scientific methods, the construction risk caused by improper operation is reduced and the construction safety is improved.

[0025] Furthermore, by accurately measuring the actual single settlement depth with a total station, the piling process can be more accurately controlled to ensure that the target single pile reaches the designed standard settlement depth. According to the comparison results of the actual single settlement depth and the standard single settlement depth, the piling cycle or the falling speed is adjusted in real time to make the piling process more in line with the actual geological conditions. By comparing the actual single settlement depth with the standard single settlement depth, it is ensured that the pile body reaches the predetermined bearing capacity requirements and the construction quality of the pile foundation project is improved.

[0026] Furthermore, by analyzing the actual single settlement depth, the piling process can be controlled more accurately to ensure that the pile reaches the settlement depth required by the design. Determining whether to adjust the initial falling speed according to the settlement grade helps to optimize the piling parameters and improve the construction efficiency. The verticality of the target single pile is detected by the acoustic inclinometer method to ensure that the verticality of the pile meets the piling conditions, thereby ensuring the construction quality. By real-time monitoring and analysis of settlement data, the piling cycle and falling speed can be adjusted in time to adapt to different geological conditions. By accurately controlling the settlement depth and the verticality of the pile body, the engineering risks caused by improper piling are reduced. Reasonable adjustment of piling parameters helps to reduce energy consumption and equipment wear and reduce construction costs. By monitoring and adjusting the verticality of the target single pile, the safety risks in the construction process are reduced and the safety of construction personnel is guaranteed. This method can adjust the piling parameters according to different soil softness and actual settlement conditions, and improve the environmental adaptability of the construction method. By calculating the average settlement depth and standard deviation, the settlement grade can be quickly determined, which improves the efficiency and accuracy of data analysis.

[0027] Furthermore, by increasing the first falling speed, the problem of pile settlement stagnation caused by insufficient initial falling speed can be effectively overcome, ensuring that the pile reaches the standard piling depth. By adjusting the falling speed and piling frequency, the piling operation can be completed more quickly and the construction efficiency can be improved. This method allows the piling parameters to be dynamically adjusted according to the actual construction situation, which enhances the flexibility and adaptability of the construction. By precisely controlling the piling process, the pile settlement is ensured to be uniform, meet the design requirements, and improve the target single pile bearing capacity. By changing the static pressure value of the static pile driver, the target single pile can be settled to the standard settlement depth.

[0028] Furthermore, by filling with gravel and compacting it, the bearing capacity of the soil at the bottom of the target pile can be enhanced to ensure that the target pile meets the design bearing capacity requirements. Avoid engineering quality problems caused by insufficient bearing capacity of the target pile and ensure the stability and safety of the entire pile foundation project. By adjusting the piling frequency according to the actual situation after filling, the gravel at the bottom of the target pile can be made denser and the piling process can be optimized. Through the adjustment of real-time data and compensation parameters, the piling frequency can be quickly adjusted to improve construction efficiency and progress. By ensuring the bearing capacity of the target pile, the engineering risks and subsequent maintenance costs caused by insufficient bearing capacity are reduced. By solving the bearing capacity problem at one time, repeated construction and repair are avoided, saving construction costs. The secondary adjustment of the piling frequency using the data collected by the force measuring device improves the accuracy and practicality of data analysis. After filling with gravel and compacting it, the gravel on both sides of the bottom of the target pile is well settled, which improves the stability and anti-tilting ability of the target pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A process flow chart of a pile driving method for improving the bearing capacity of a single pile in this embodiment;

[0030] Figure 2 This is a flow chart of the initial falling speed adjustment process of the pile driving method for improving the bearing capacity of a single pile in this embodiment;

[0031] Figure 3 A flow chart of the piling frequency adjustment process of the piling method for improving the bearing capacity of a single pile in this embodiment;

[0032] Figure 4 This is a flow chart of the piling mode adjustment process of the piling method for improving the bearing capacity of a single pile in this embodiment. DETAILED DESCRIPTION

[0033] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0035] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0036] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] See also Figure 1-Figure 4 Shown Figure 1 A process flow chart of a pile driving method for improving the bearing capacity of a single pile in this embodiment; Figure 2 This is a flow chart of the initial falling speed adjustment process of the pile driving method for improving the bearing capacity of a single pile in this embodiment; Figure 3 A flow chart of the piling frequency adjustment process of the piling method for improving the bearing capacity of a single pile in this embodiment; Figure 4 This is a flow chart of the piling mode adjustment process of the piling method for improving the bearing capacity of a single pile in this embodiment.

[0038] This embodiment provides a pile driving method for improving the bearing capacity of a single pile, comprising the following steps:

[0039] Step S100, fixing the target single pile that has passed the initial bearing capacity test at the target piling position by means of a guide device;

[0040] Step S200, measuring the soil softness of the soil around the pile at the target piling position to obtain the initial soil softness, and determining the initial falling speed of the pile hammer according to the initial soil softness;

[0041] Step S300, periodically piling the target single pile at the initial falling speed according to a preset initial piling interval;

[0042] Step S400, obtaining each actual single settlement depth of the target single pile, analyzing any actual single settlement depth, and determining whether the settlement requirement is met according to the analysis result;

[0043] Step S500, in the case where the settlement requirement is not met, measuring the verticality of the target single pile to obtain an actual target single pile vertical angle, and determining whether to adjust the initial falling speed according to the actual target single pile vertical angle to obtain a first falling speed;

[0044] Step S600, obtaining a first piling result at the first falling speed, adjusting an initial piling frequency to obtain a first piling frequency based on a situation where the settlement requirement is not met, obtaining a second piling result based on the first piling frequency, and adjusting the piling method according to the second piling result, wherein the initial piling frequency is determined according to a historical piling frequency and the softness of soil at the target piling position.

[0045] Specifically, the bearing capacity of the target single pile is detected to obtain the initial bearing capacity, the maximum falling speed of the pile hammer is limited according to the initial bearing capacity, and the initial falling speed of the pile hammer is estimated according to the initial soil softness.

[0046] In this embodiment, the initial bearing capacity of the target pile is tested by the heap loading method. The initial bearing capacity of the target pile is the maximum bearing capacity that the target pile can withstand before the pile driving operation.

[0047] This embodiment provides an initial falling speed adjustment process of a pile driving method for improving the bearing capacity of a single pile, comprising:

[0048] Step S210, measuring the softness of the soil around the pile at the target piling position;

[0049] Step S220, determining the initial falling speed according to the softness of the soil around the pile;

[0050] Step S230, the initial falling speed is insufficient to make the target pile settle, and the verticality of the target pile is measured;

[0051] Step S240, adjusting the initial falling speed based on the target single pile verticality determination result.

[0052] The fastest falling speed of the pile hammer is estimated according to the initial bearing capacity of the target single pile, the fastest falling speed of the pile hammer is Vz, Vz = Fz × q1, where Fz is the initial bearing capacity of the target single pile, and q1 is the compensation parameter for the influence of the initial bearing capacity of the target single pile on the fastest falling speed of the pile hammer;

[0053] The softness of the soil around the pile at the target piling position is measured according to the static penetration test method, wherein the static penetration test method is to use a static penetration cone to press into the soil at a uniform speed and measure the penetration resistance to evaluate the properties of the soil layer. The response of the cone to the soil can reflect the softness of the soil.

[0054] The initial falling speed of the pile hammer is V0, V0=R×q2, where R is the softness of the soil around the pile at the target piling position; q2 is the compensation parameter for the influence of the softness of the soil around the pile at the target piling position on the initial falling speed of the pile hammer.

[0055] By limiting the falling speed of the pile driver through the initial bearing capacity, it is possible to avoid the impact force exceeding the maximum bearing capacity of the target single pile due to the excessively fast speed when the pile driver initially falls, which may cause deformation or breakage of the target single pile. The initial falling speed of the pile driver is initially adjusted according to the measurement result of the initial soil softness around the target single pile. The initial falling speed of the pile driver can be adjusted according to the initial soil softness around the target single pile, which can avoid the use of a larger falling speed of the pile driver due to low soil softness, which may easily cause the target single pile to deviate, causing great damage to the initial soil structure around the target single pile and affecting the construction progress. The pile driver is used to drive the target single pile at an appropriate falling speed to protect the initial soil structure around the pile.

[0056] The target single pile is fixed by the guide device, which ensures the verticality and positioning accuracy of the pile body, thereby improving the accuracy of piling. The initial falling speed of the pile hammer is determined according to the initial softness of the soil around the pile, so that the piling process is more in line with the actual geological conditions and the piling efficiency is improved. By real-time monitoring the settlement depth of the target single pile, the piling parameters can be adjusted according to the actual settlement situation to ensure that the settlement requirements are met. For situations where the settlement requirements are not met, the verticality measurement and falling speed adjustment are carried out to effectively solve the construction quality problems caused by the inclination of the pile body. By optimizing the piling parameters and frequency, the energy consumption and material loss in the piling process are reduced, thereby saving construction costs. This method can complete the piling operation quickly and accurately, which is conducive to speeding up the progress of the project, shortening the construction period, and improving the bearing capacity of the target single pile.

[0057] By obtaining the initial bearing capacity of the target single pile, the maximum falling speed of the pile hammer can be more accurately limited to prevent damage to the pile body or insufficient bearing capacity caused by too fast a falling speed, thereby ensuring the overall safety of the building structure. The falling speed of the pile hammer is limited according to the initial bearing capacity of the target single pile to avoid unnecessary over-pile driving and improve construction efficiency. By estimating the initial falling speed of the pile hammer, it is possible to better adapt to different soil conditions and make the piling process smoother and more efficient. Limiting the maximum falling speed of the pile hammer helps reduce the impact on the pile body, prevent cracks or deformation in the pile body, and maintain the integrity of the pile body. By estimating and limiting the piling speed through scientific methods, the construction risk caused by improper operation is reduced and the construction safety is improved.

[0058] Specifically, any actual single settlement depth is obtained, and any actual single settlement depth is compared with a standard single settlement depth range to obtain a first comparison result, and it is determined whether to adjust the piling cycle or the initial falling speed according to the first comparison result.

[0059] Specifically, each actual single settlement depth is measured, compared with several consecutive actual single settlement depths, and whether the piling is completed is determined based on the comparison result.

[0060] According to the actual single settlement depths of the target single pile measured by the total station, the first actual single settlement depth L1, the second actual single settlement depth L2, the third actual single settlement depth L3, ..., the nth actual single settlement depth Ln are obtained. The total station measures the actual single settlement depth of the target single pile with the initial piling period Tz.

[0061] Select any actual single settlement depth Li except the first actual single settlement depth L1, i = 2, 3, ..., n,

[0062] When any actual single settlement depth Li is not zero, the actual piling depth is compared with the preset standard piling depth, where the actual piling depth is the total actual settlement depth of the target single pile. When the standard piling depth is equal to the actual piling depth, the piling operation is stopped and the piling is completed.

[0063] When the actual single settlement depth is zero for three consecutive times, the verticality of the target single pile is measured using the sonic inclinometer method. The sonic inclinometer method is to pre-embed sonic wave transmitting and receiving devices in the target single pile, and infer the verticality of the pile by analyzing the time difference or speed change of the sonic wave propagating in the pile body.

[0064] By accurately measuring the actual single settlement depth with a total station, the piling process can be controlled more accurately to ensure that the target single pile reaches the designed standard settlement depth. According to the comparison results of the actual single settlement depth and the standard single settlement depth, the piling cycle or the falling speed can be adjusted in real time to make the piling process more in line with the actual geological conditions. By comparing the actual single settlement depth with the standard single settlement depth, it is ensured that the pile body reaches the predetermined bearing capacity requirements and the construction quality of the pile foundation project is improved.

[0065] Specifically, based on adjusting the piling cycle, actual single settlement depths in several piling cycles are obtained, the actual single settlement depths are analyzed to obtain a first analysis result, and it is determined whether to adjust the initial falling speed according to the first analysis result.

[0066] Specifically, according to the situation that any single settlement depth is greater than the standard single settlement depth, the actual settlement depth group in the middle section of the piling cycle is obtained, and the actual settlement depth group in the middle section is analyzed to obtain the settlement grade, and it is determined whether to adjust the initial falling speed in the end according to the settlement grade.

[0067] Specifically, the actual target single pile verticality is obtained by detecting the target single pile verticality, and the actual target single pile verticality is compared with the standard target single pile verticality to determine whether to issue a target single pile verticality adjustment signal.

[0068] The standard verticality of the target pile measured by the acoustic wave inclinometer method is B0, B0 = Ta0 × r1, where Ta0 is the standard propagation time of the acoustic wave in the target pile; r1 is the compensation parameter for the influence of the standard propagation time of the acoustic wave in the target pile on the standard verticality of the target pile;

[0069] The actual verticality of the target pile when the actual single settlement depth is zero for three consecutive times is B1=Ta1×r1, where Ta1 is the actual propagation time of the sound wave in the target pile;

[0070] When Ta1 is within the interval [0.98Ta0, 1.02Ta0], the target single pile verticality meets the piling conditions and the initial falling speed needs to be adjusted.

[0071] When Ta1 is not within the interval [0.98Ta0, 1.02Ta0], the acoustic wave transmitting and receiving device sends a first adjustment signal to adjust the verticality of the target single pile;

[0072] According to the initial soil softness and the actual pile driving depth, the standard single settlement depth range [0.9Lb, 1.1Lb] is determined.

[0073] Select any actual single settlement depth Li,

[0074] When Li<0.9Lb, the initial falling speed is increased to obtain the first falling speed V1, V1=[1+(0.9Lb-Li) / 0.9Lb]×V0;

[0075] When 0.9Lb≤Li≤1.1Lb, the pile hammer continues to pile at the initial falling speed;

[0076] When Li>1.1Lb, the initial piling cycle is adjusted to obtain the first piling cycle Tz1, Tz1=[1-(Li-1.1Lb) / 1.1Lb]×Tz;

[0077] Based on the first piling cycle, the actual settlement depth La of the middle section in the piling cycle is obtained, the first actual settlement depth La1 of the middle section, the second actual settlement depth La2 of the middle section, the third actual settlement depth La3, ..., the nth actual settlement depth Lan of the middle section,

[0078] Select any middle section actual settlement depth Lam, where m = 1, 2, 3, ..., n,

[0079] If Lam>1.1Lb,

[0080] Calculate the average settlement depth Lavg of the actual settlement depth group La in the middle section, Lavg = (La1 + La2 + La3 + ... + Lam) / m

[0081] Calculate the standard deviation Sd of the actual settlement depth group La in the middle section. First, calculate the sum of the squares of the difference between the actual settlement depth of each middle section and the average settlement depth, Σ(Lam-Lavg) 2 , where m = 1, 2, 3, ..., n,

[0082] The standard deviation Sd is obtained by dividing the sum of the squares of the above differences by the number of mid-segments n and taking the square root. Sd = sqrt[Σ(Lam-Lavg) 2 ] / n, according to the average sedimentation depth Lavg and standard deviation Sd, determine the sedimentation grade,

[0083] If Lavg≤Sstd and Sd≤0.5*Sstd, the sedimentation level is level 1, and the current initial falling speed remains unchanged;

[0084] If Lavg≤Sstd and Sd>0.5*Sstd, the settlement level is level 2, and the initial falling speed should be appropriately reduced to reduce the settlement fluctuation;

[0085] If Lavg>Sstd and Sd≤0.5*Sstd, the settlement grade is grade three. The initial falling velocity is significantly reduced to control the settlement velocity. The piling operation is suspended, the geological conditions are surveyed in detail, and the piling plan is adjusted before restarting the operation.

[0086] By analyzing the actual single settlement depth, the piling process can be controlled more accurately to ensure that the pile reaches the settlement depth required by the design. Determining whether to adjust the initial falling speed according to the settlement grade helps to optimize the piling parameters and improve construction efficiency. The verticality of the target single pile is detected by the sonic inclinometer method to ensure that the verticality of the pile meets the piling conditions, thereby ensuring the construction quality. By real-time monitoring and analysis of settlement data, the piling cycle and falling speed can be adjusted in time to adapt to different geological conditions. By accurately controlling the settlement depth and the verticality of the pile body, the engineering risks caused by improper piling are reduced. Reasonable adjustment of piling parameters helps to reduce energy consumption and equipment wear and reduce construction costs. By monitoring and adjusting the verticality of the target single pile, the safety risks in the construction process are reduced and the safety of construction personnel is guaranteed. This method can adjust the piling parameters according to different soil softness and actual settlement conditions, and improve the environmental adaptability of the construction method. By calculating the average settlement depth and standard deviation, the settlement grade can be quickly determined, which improves the efficiency and accuracy of data analysis.

[0087] Specifically, based on the situation that the verticality of the target single pile is not adjusted, the initial falling speed is adjusted according to the initial falling speed and the total settlement depth, and the falling speed after adjustment is the first falling speed.

[0088] When the settlement grade is level 2 or level 3, the initial falling speed is adjusted according to the initial falling speed and the total settlement depth. The falling speed after adjustment is the first falling speed. When the target single pile stays at the total settlement depth due to insufficient initial falling speed, it is necessary to increase the falling speed of the pile hammer according to the initial falling speed and the total settlement depth, that is, to adjust it to the first falling speed V1, V1 = V0 + Lz × j1, wherein Lz is the total settlement depth, which is the settlement depth of the current target single pile stop position; j1 is the compensation parameter for the influence of the total settlement depth on the first falling speed;

[0089] Specifically, the pile driving hammer is operated to drive the target single pile at the first falling speed to obtain a second piling result, and if the target single pile can be driven to a standard piling depth, the piling operation is terminated;

[0090] The embodiment provides a pile driving frequency adjustment process of a pile driving method for improving the bearing capacity of a single pile, comprising:

[0091] Step S610, driving a target single pile according to a first falling speed and an initial piling frequency to obtain a first piling result;

[0092] Step S620, the first piling result is that the target single pile no longer settles, and the initial piling frequency is adjusted;

[0093] Step S630, adjusting the initial piling frequency to obtain a first piling frequency according to the depth difference between the standard piling depth and the current target single pile settlement depth;

[0094] Step S640: The greater the depth difference, the greater the first piling frequency and the faster the piling speed.

[0095] If the target single pile is driven at the first falling speed, it is insufficient to drive the target single pile to the standard piling depth, then the initial piling frequency is adjusted, and the initial piling frequency is determined by the softness of the soil and the standard piling depth.

[0096] Set the maximum frequency threshold of pile driving. The maximum frequency threshold may be set at around 20-25 Hz. The maximum frequency threshold of pile driving needs to be determined through field testing and engineering evaluation. Before construction, engineers will set a preliminary maximum frequency threshold based on design specifications and past experience. The maximum frequency threshold will be adaptively adjusted during the construction process.

[0097] This embodiment provides a piling method adjustment process for improving the bearing capacity of a single pile, including:

[0098] Step S650, when the first piling frequency reaches the maximum piling frequency threshold, adjusting the piling mode;

[0099] Step S660, adjusting the hammering method to the static pressure method, replacing the pile driving device such as the pile hammer with a static pile driver;

[0100] Step S670, the static pressure value of the static pile driver is the pressure generated by the first piling frequency and the first falling speed as the initial static pressure value;

[0101] Step S680, adjusting the initial static pressure value according to the difference between the current target single pile settlement depth and the standard settlement depth.

[0102] If the target pile still does not reach the standard settlement depth when the first pile driving frequency is adjusted to the maximum pile driving frequency threshold, the pile driving method is adjusted from the hammering method to the static pressure method. The static pressure method is to gradually press the target pile into the soil by applying an initial static pressure value to the target pile by a static pile driver.

[0103] Firstly, the pressure generated by the first piling frequency and the first falling speed is adapted to the static pile driver to perform static pressure on the target single pile, and the initial static pressure value is adjusted according to the difference between the current target single pile settlement depth and the standard settlement depth until the static pressure value of the target single pile reaches the standard settlement depth.

[0104] By increasing the first drop speed, the problem of pile settlement stagnation caused by insufficient initial drop speed can be effectively overcome, ensuring that the pile reaches the standard piling depth. By adjusting the drop speed and piling frequency, the piling operation can be completed more quickly, improving construction efficiency. This method allows the piling parameters to be dynamically adjusted according to the actual construction situation, enhancing the flexibility and adaptability of the construction. By precisely controlling the piling process, the pile settlement is ensured to be uniform, meet the design requirements, and improve the target single pile bearing capacity.

[0105] Carry out bearing capacity test on target piles that reach preset depth, and fill sand and gravel at the bottom of target piles that do not reach preset bearing capacity. If the soil at the bottom of target pile is soft, the soil cannot bear the pressure of target pile on the soil, and it is necessary to fill sand and gravel at the bottom of target pile to avoid insufficient bearing capacity of target pile due to soft soil, which may cause engineering quality problems.

[0106] Specifically, the piling frequency is adjusted for the second time after the filling is completed according to the data collected by the force measuring device on the pile hammer.

[0107] Da3=Fa`×jb1, where Da3 is the second adjustment of the piling frequency value; Fa` is the real-time data of the force measuring device after the bottom of the target single pile is filled with sand and gravel; jb1 is the compensation parameter for the influence of the real-time data of the force measuring device after the bottom of the target single pile is filled with sand and gravel on the second adjustment of the piling frequency value.

[0108] A second adjustment of the piling frequency after filling is completed based on the data collected by the force measuring device on the pile hammer can compact the sand and gravel at the bottom of the target single pile, and the sand and gravel on both sides of the bottom of the target single pile can be better settled, thereby improving the bearing capacity of the target single pile.

[0109] By filling and compacting the gravel, the bearing capacity of the soil at the bottom of the target pile can be enhanced to ensure that the target pile meets the design bearing capacity requirements. Avoid engineering quality problems caused by insufficient bearing capacity of the target pile and ensure the stability and safety of the entire pile foundation project. Adjusting the piling frequency according to the actual situation after filling can make the gravel at the bottom of the target pile more compact and optimize the piling process. Through the adjustment of real-time data and compensation parameters, the piling frequency can be quickly adjusted to improve construction efficiency and progress. By ensuring the bearing capacity of the target pile, the engineering risks and subsequent maintenance costs caused by insufficient bearing capacity are reduced. By solving the bearing capacity problem at one time, repeated construction and repair are avoided, saving construction costs. The secondary adjustment of the piling frequency using the data collected by the force measuring device improves the accuracy and practicality of data analysis. After filling and compacting the gravel, the gravel on both sides of the bottom of the target pile is well settled, improving the stability and anti-tilting ability of the target pile.

[0110] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0111] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A piling method for improving the bearing capacity of a single pile, characterized in that: include, The target single pile that has passed the initial bearing capacity test is fixed at the target piling position through the guide device; Measuring the soil softness of the soil around the pile at the target piling position to obtain the initial soil softness, and determining the initial falling speed of the pile hammer according to the initial soil softness; According to a preset initial piling interval, periodically piling the target single pile at the initial falling speed; Acquire each actual single settlement depth of the target single pile, analyze any actual single settlement depth, and determine whether the settlement requirement is met according to the analysis result; In the case where the settlement requirement is not met, the target single pile verticality is measured to obtain an actual target single pile verticality, and whether to adjust the initial falling speed according to the actual target single pile vertical angle to obtain a first falling speed; A first piling result at the first falling speed is obtained; based on a situation where the settlement requirement is not met, an initial piling frequency is adjusted to obtain a first piling frequency; a second piling result is obtained based on the first piling frequency; and the piling method is adjusted according to the second piling result, wherein the initial piling frequency is the piling frequency used when starting piling, and the initial piling frequency is determined according to a historical piling frequency and the softness of soil at the target piling position.

2. The pile driving method for improving the bearing capacity of a single pile according to claim 1, characterized in that: The bearing capacity of the target single pile is detected to obtain the initial bearing capacity, the maximum falling speed of the pile hammer is limited according to the initial bearing capacity, and the initial falling speed of the pile hammer is estimated according to the initial soil softness.

3. The pile driving method for improving the bearing capacity of a single pile according to claim 2, characterized in that: Obtain any actual single settlement depth, compare any actual single settlement depth with a standard single settlement depth range, obtain a first comparison result, and determine whether to adjust the piling cycle or the initial falling speed according to the first comparison result.

4. The pile driving method for improving the bearing capacity of a single pile according to claim 3, characterized in that: The actual single settlement depths are measured, compared with several consecutive actual single settlement depths, and whether the piling is completed is determined based on the comparison results.

5. The piling method for improving the bearing capacity of a single pile according to claim 4, characterized in that: Based on adjusting the piling cycle, actual single settlement depths in several piling cycles are obtained, the actual single settlement depths are analyzed to obtain a first analysis result, and it is determined whether to adjust the initial falling speed according to the first analysis result.

6. The pile driving method for improving the bearing capacity of a single pile according to claim 5, characterized in that: According to the situation that any single settlement depth is greater than the standard single settlement depth, the actual settlement depth group in the middle section of the piling cycle is obtained, and the actual settlement depth group in the middle section is analyzed to obtain the settlement grade, and it is determined whether to adjust the initial falling speed in the end according to the settlement grade.

7. The pile driving method for improving the bearing capacity of a single pile according to claim 6, characterized in that: The actual target single pile verticality is obtained by detecting the target single pile verticality, and the actual target single pile verticality is compared with the standard target single pile verticality to determine whether to issue a target single pile verticality adjustment signal.

8. The pile driving method for improving the bearing capacity of a single pile according to claim 7, characterized in that: Based on the situation that the verticality of the target single pile is not adjusted, the initial falling speed is adjusted according to the initial falling speed and the total settlement depth, and the falling speed after adjustment is the first falling speed.

9. The pile driving method for improving the bearing capacity of a single pile according to claim 8, characterized in that: The pile driving hammer is operated to drive piles at the first falling speed, a second piling result is obtained, and according to the second piling result, it is determined whether to adjust the initial piling frequency to obtain the first piling frequency.

10. The pile driving method for improving the bearing capacity of a single pile according to claim 9, characterized in that: A third piling result is obtained by piling based on the first piling frequency, and it is determined whether to adjust the piling mode according to the third piling result.

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