Construction method of cast-in-situ bored pile

Abstract

The invention relates to the technical field of civil engineering, in particular to a construction method of a cast-in-situ bored pile, which comprises the following steps: cleaning a pile foundation construction site; embedding a pile casing; installing a drilling machine and a slurry circulating system; drilling construction is conducted; when it is judged that the drill hole of the preset characterization depth section does not meet the preset standard according to the hole forming characteristic coefficient, the viscosity of slurry injected into the drill hole of the next preset characterization depth section is increased, or the adjusting mode of the drill hole parameters of the next preset characterization depth section is determined according to the abnormal drill bit vibration frequency; when it is judged that the drilled hole of the preset characterization depth section meets the preset standard, drilling construction of the next preset characterization depth section is completed; when it is judged that the formed hole does not meet the preset standard according to the hole forming evaluation coefficient, the preset characterization depth of the next drilled hole is corrected, or hole sweeping treatment is conducted on the formed hole; and when the formed hole meets the preset standard, hoisting of the reinforcement cage and pouring of concrete are conducted in sequence, and the hole forming quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering, and in particular to a construction method of bored cast-in-place piles. Background Art

[0002] Bored piles are a commonly used foundation treatment method. Pile holes are formed in the foundation soil by mechanical drilling, steel pipe squeezing or manual excavation, and steel cages are placed inside and concrete is poured to form piles. Among the many construction links of cast-in-place piles, the quality of the pile hole directly affects the bearing capacity of the pile foundation, but the shrinkage phenomenon is very likely to occur during the drilling process.

[0003] Chinese patent publication number: CN111197305B, discloses a construction method for super-long diameter bored piles, including the steps: S1, construction preparation; S2, construction of bored pile hole forming system; S3, construction of pump suction reverse circulation drilling rig; S4, hole cleaning and slurry replacement; S5, steel cage production and positioning; S6, underwater concrete pouring; S7, pile foundation detection. The beneficial effects of the present invention are: the present invention uses a large-diameter drill rod multi-stage progressive tooth wheel and a conical tooth wheel combination drill bit to drill holes, giving full play to the advantages of different drill bits in drilling in different strata, and can effectively improve the verticality and construction efficiency of drilling holes; using a steel casing with an interlocking tooth wing ring on the top to connect with the drilling platform, the surrounding soil is less disturbed, and the risk of surrounding pile foundation collapse is effectively avoided, ensuring the normal use of other accessories and operating equipment and driving safety. It can be seen that the above technical solution lacks the function of real-time monitoring and control of the drilling process, resulting in the inability to deal with the shrinkage problem in a timely manner. Summary of the invention

[0004] To this end, the present invention provides a bored cast-in-place pile construction method to overcome the problem that the prior art lacks the function of real-time monitoring and control of the drilling process, resulting in the inability to deal with the shrinkage problem in a timely manner.

[0005] To achieve the above object, the present invention provides, including:

[0006] Clean up the pile foundation construction site and use the total station to stake out the pile positions according to the construction drawings;

[0007] The casing is buried at the pile position to be constructed, wherein the top of the casing is higher than the ground by a preset distance;

[0008] Install drilling rig and mud circulation system;

[0009] Turning on the drilling rig and the mud circulation system to perform drilling construction and obtaining the drilling rig drill bit torque information, drill bit vibration information and mud information within a preset characterization depth section, wherein the mud information includes the viscosity of the injected mud and the viscosity of the output mud;

[0010] When obtaining the hole formation characteristic coefficient according to the mud information and determining that the drilling of the preset characterization depth section does not meet the preset standard according to the hole formation characteristic coefficient, increasing the viscosity of the mud injected into the drilling of the next preset characterization depth section, or determining the adjustment method of the drilling parameters of the next preset characterization depth section according to the abnormal drill bit vibration frequency;

[0011] When it is determined according to the hole formation characteristic coefficient that the drilling of the preset characterization depth section meets the preset standard, the drilling construction of the next preset characterization depth section is completed until the drilling depth reaches the design requirement;

[0012] Using an ultrasonic pore forming detector to detect the pores, obtaining the pore forming cross-sectional profile information, and obtaining the pore forming evaluation coefficient according to the pore forming cross-sectional profile information;

[0013] When it is determined according to the hole evaluation coefficient that the hole does not meet the preset standard, the preset characterization depth of the next drilling hole is corrected, or the hole is subjected to a hole sweeping process;

[0014] When it is determined based on the hole formation evaluation coefficient that the hole formation meets the preset standard, the steel cage is hoisted and the concrete is poured in sequence to complete the construction of the bored pile.

[0015] Further, the process of determining, according to the hole formation characteristic coefficient, that the drilling hole of the preset characterization depth does not meet the preset standard includes:

[0016] Comparing the pore formation characteristic coefficient with a first preset pore formation characteristic coefficient and a second preset pore formation characteristic coefficient respectively;

[0017] If the hole formation characteristic coefficient is less than the first preset hole formation characteristic coefficient, it is determined that the drilling of this section does not meet the preset standard, and the viscosity of the drilling mud injected into the next preset characterization depth section is increased according to the difference between the first preset hole formation characteristic coefficient and the hole formation characteristic coefficient;

[0018] If the hole formation characteristic coefficient is greater than or equal to the second preset hole formation characteristic coefficient, it is determined that the drilling of this section does not meet the preset standard, and the adjustment method of the drilling parameters of the next preset characterization depth section is determined according to the abnormal drill bit vibration frequency, wherein a fluctuation in the drill bit lateral vibration amplitude exceeding the preset amplitude threshold is recorded as an abnormal drill bit vibration.

[0019] Furthermore, the hole formation characteristic coefficient is a ratio of a change value of the inlet and outlet mud viscosity to a preset viscosity change threshold, wherein the change value of the inlet and outlet mud viscosity is a viscosity difference between the output mud and the injected mud.

[0020] Furthermore, several viscosity adjustment methods are provided for increasing the viscosity of the drilling slurry injected into the borehole, and each viscosity adjustment method increases the viscosity of the drilling slurry injected into the borehole by a different degree.

[0021] Furthermore, under the first preset condition, several viscosity correction methods are provided for the viscosity correction of the drilling mud, and each viscosity correction method has a different correction amplitude for the viscosity of the drilling mud; the first preset condition is that the viscosity of the drilling mud has completed the increase adjustment and the adjusted drill bit torque is greater than or equal to the preset torque threshold.

[0022] Furthermore, the adjustment method of the drilling parameters of the next preset characterizing depth segment is determined according to the abnormal drill bit vibration frequency, wherein:

[0023] If the abnormal drill bit vibration frequency is less than a preset frequency threshold, determining that the adjustment method of the drilling parameter of the next preset characterizing depth segment is to reduce the drilling speed of the drilling rig according to the difference between the preset frequency threshold and the abnormal drill bit vibration frequency;

[0024] If the abnormal drill bit vibration frequency is greater than or equal to the preset frequency threshold, the adjustment method of the drilling parameters of the next preset depth segment is determined by increasing the drill bit speed of the drilling rig according to the difference between the abnormal drill bit vibration frequency and the preset frequency threshold.

[0025] Furthermore, the reduction amplitude of the drilling speed is positively correlated with the frequency difference, wherein the frequency difference is the difference between the preset frequency threshold and the abnormal drill bit vibration frequency.

[0026] Further, the process of determining that the pore formation does not meet the preset standard according to the pore formation evaluation coefficient includes:

[0027] Comparing the pore formation evaluation coefficient with the first preset pore formation value and the second preset pore formation value respectively;

[0028] If the hole formation evaluation coefficient is greater than or equal to the first preset hole formation value and less than the second preset hole formation value, it is determined that the hole formation does not meet the preset standard, and the preset characterization depth of the next drilling hole is corrected according to the difference between the hole formation evaluation coefficient and the first preset hole formation value;

[0029] If the hole formation evaluation coefficient is greater than or equal to the second preset hole formation value, it is determined that the hole formation does not meet the preset standard, and the hole formation is subjected to hole cleaning processing.

[0030] Furthermore, the hole formation evaluation coefficient is the deviation area between the hole formation cross-sectional profile and the designed cross-sectional profile within a unit length.

[0031] Furthermore, several depth correction methods are provided for the correction of the preset characterization depth of the next borehole, and each depth correction method has a different correction range for the preset characterization depth of the next borehole. Compared with the prior art, the beneficial effect of the present invention is that the present invention checks the drilling quality of the preset characterization depth through the hole formation characteristic coefficient and adjusts the mud parameters or the drill bit speed or the drilling speed of the drilling rig to solve the problem of shrinkage in the borehole. At the same time, the hole formation quality is detected through the hole formation evaluation coefficient to ensure that the hole formation quality meets the standard, thereby improving the construction efficiency of bored piles.

[0032] Furthermore, the present invention determines whether the drilling of the preset characterization depth meets the preset standard through the hole formation characteristic coefficient, thereby realizing real-time monitoring of the drilling process.

[0033] Furthermore, the present invention provides an evaluation index for assessing whether the drilling quality reaches a preset standard by setting a hole characteristic coefficient, thereby improving the scientific nature of the construction method.

[0034] Furthermore, the present invention provides several viscosity adjustment methods for increasing the viscosity of the drilling injection mud, and each viscosity adjustment method increases the viscosity of the drilling injection mud by a different amount, thereby achieving precise control of the viscosity adjustment range of the injected mud.

[0035] Furthermore, the present invention improves the applicability of the mud viscosity by providing several viscosity correction methods for the viscosity correction of the drilling mud, and each viscosity correction method has a different correction range for the viscosity of the drilling mud.

[0036] Furthermore, the present invention determines the adjustment method of the drilling parameters of the next preset characterizing depth segment through the abnormal drill bit vibration frequency, and dynamically adjusts the drilling speed or drill bit rotation speed, thereby improving the construction efficiency.

[0037] Furthermore, the present invention determines whether the pore formation meets the preset standard through the pore formation evaluation coefficient, thereby achieving accurate evaluation of the pore formation quality.

[0038] Furthermore, the present invention provides several depth correction methods for correcting the preset characterization depth of the next borehole, and each depth correction method has a different correction amplitude for the preset characterization depth of the next borehole, thereby improving the objectivity of the correction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a flow chart of a construction method of bored cast-in-place piles according to an embodiment of the present invention;

[0040] Figure 2 A flowchart of an embodiment of the present invention for determining whether a borehole having a preset characterization depth meets a preset standard;

[0041] Figure 3 A flowchart of an adjustment method for determining the drilling parameters of the next preset characterizing depth segment according to an embodiment of the present invention;

[0042] Figure 4 The present invention is a flowchart for determining whether the hole forming meets the preset standard. DETAILED DESCRIPTION

[0043] 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.

[0044] It should be pointed out that the data in this embodiment are obtained by comprehensive analysis and evaluation of the historical detection data and the corresponding historical detection results three months before the image processing by the method of the present invention. It can be understood by those skilled in the art that the method of the present invention can determine the above parameters for a single item by selecting the value with the highest proportion as the preset standard parameter according to the data distribution, using weighted summation to use the obtained value as the preset standard parameter, substituting each historical data into a specific formula and using the value obtained by the formula as the preset standard parameter or other selection methods, as long as the method of the present invention can clearly define the different specific situations in the single determination process through the obtained values.

[0045] 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.

[0046] See also Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, they are respectively a flow chart of a construction method for bored cast-in-place piles according to an embodiment of the present invention; a flow chart of determining whether the drilling of the preset characterizing depth meets the preset standard according to an embodiment of the present invention; a flow chart of determining an adjustment method for the drilling parameters of the next preset characterizing depth segment according to an embodiment of the present invention; and a flow chart of determining whether the hole formed meets the preset standard according to an embodiment of the present invention.

[0047] A construction method of bored cast-in-place piles according to an embodiment of the present invention comprises:

[0048] Step S1, cleaning the pile foundation construction site and using a total station to stake out the pile positions according to the construction drawings;

[0049] Step S2, burying the casing at the pile position to be constructed, wherein the top of the casing is 0.5m above the ground by a preset distance;

[0050] Step S3, installing the drilling rig and the mud circulation system;

[0051] Step S4, starting the drilling rig and the mud circulation system to perform drilling construction and obtaining the drilling rig drill bit torque information, drill bit vibration information and mud information within a preset characterization depth section of 1 m, wherein the mud information includes the viscosity of the injected mud and the viscosity of the output mud;

[0052] Step S5, when obtaining a hole formation characteristic coefficient according to the mud information and determining that the drilling of the preset characterization depth section does not meet the preset standard according to the hole formation characteristic coefficient, increasing the viscosity of the mud injected into the drilling of the next preset characterization depth section, or determining the adjustment method of the drilling parameters of the next preset characterization depth section according to the abnormal drill bit vibration frequency;

[0053] Step S6, when it is determined according to the hole formation characteristic coefficient that the drilling of the preset characterization depth section meets the preset standard, the drilling construction of the next preset characterization depth section is completed until the drilling depth reaches the design requirement;

[0054] Step S7, using an ultrasonic pore forming detector to detect the pores, obtain pore forming cross-sectional profile information, and obtain a pore forming evaluation coefficient based on the pore forming cross-sectional profile information;

[0055] Step S8, when it is determined according to the hole evaluation coefficient that the hole does not meet the preset standard, the preset characterization depth of the next drilling hole is corrected, or the hole is scanned;

[0056] Step S9, when it is determined based on the hole formation evaluation coefficient that the hole formation meets the preset standard, the steel cage is hoisted and the concrete is poured in sequence to complete the construction of the bored pile.

[0057] In the embodiment of the present invention, the model of the drilling rig may be a ZRT260H full-rotation drilling rig or a DTR2605H drilling rig, and is not specifically limited thereto, as long as the drilling requirements are met.

[0058] Specifically, the process of determining whether the drilling of the preset characterization depth meets the preset standard according to the hole formation characteristic coefficient includes:

[0059] The pore forming characteristic coefficient is compared with a first preset pore forming characteristic coefficient of 0.65 and a second preset pore forming characteristic coefficient of 1.12 respectively;

[0060] If the hole formation characteristic coefficient is less than the first preset hole formation characteristic coefficient, it is determined that the drilling of this section does not meet the preset standard, and the viscosity of the drilling mud injected into the next preset characterization depth section is increased according to the difference between the first preset hole formation characteristic coefficient and the hole formation characteristic coefficient;

[0061] If the hole formation characteristic coefficient is greater than or equal to the first preset hole formation characteristic coefficient and less than the second preset hole formation characteristic coefficient, it is determined that the drilling of this section meets the preset standard, and the drilling construction of the next preset characterization depth section is completed according to the current construction parameters until the drilling depth reaches the design requirement;

[0062] If the hole formation characteristic coefficient is greater than or equal to the second preset hole formation characteristic coefficient, it is determined that the drilling of this section does not meet the preset standard, and the adjustment method of the drilling parameters of the next preset characterization depth section is determined according to the abnormal drill bit vibration frequency, wherein a fluctuation in the drill bit lateral vibration amplitude exceeding the preset amplitude threshold of 8.79 mm is recorded as an abnormal drill bit vibration.

[0063] Specifically, the pore formation characteristic coefficient is the ratio of the inlet and outlet mud viscosity change value to a preset viscosity change threshold of 11.84 mPa·s, wherein the inlet and outlet mud viscosity change value is the viscosity difference between the output mud and the injected mud.

[0064] Specifically, several viscosity adjustment methods are provided for increasing the viscosity of the drilling injection mud, among which:

[0065] If the hole forming characteristic difference is less than the first preset hole forming characteristic difference of 0.21, the first viscosity adjustment coefficient of 1.04 is used to increase the viscosity of the mud injected into the hole;

[0066] If the hole forming characteristic difference is greater than or equal to the first preset hole forming characteristic difference and less than the second preset hole forming characteristic difference of 0.39, the viscosity of the mud injected into the hole is increased by using the second viscosity adjustment coefficient of 1.07;

[0067] If the hole forming characteristic difference is greater than or equal to the second preset hole forming characteristic difference, the viscosity of the mud injected into the hole is increased by using the third viscosity adjustment coefficient 1.11;

[0068] The pore formation characteristic difference is the difference between the first preset pore formation characteristic coefficient and the pore formation characteristic coefficient.

[0069] Specifically, under the first preset condition, several viscosity correction methods are provided for the viscosity correction of the drilling injection mud, wherein:

[0070] If the correction difference is less than the first preset correction difference of 680 KN·m, the viscosity of the mud injected into the borehole is corrected to a corresponding value using the first preset correction coefficient of 0.98;

[0071] If the correction difference is greater than or equal to the first preset correction difference and less than the second preset correction difference of 840 KN·m, the viscosity of the drilling slurry injected into the borehole is corrected to a corresponding value using the second preset correction coefficient of 0.96;

[0072] If the correction difference is greater than or equal to the second preset correction difference, the viscosity of the drilling slurry injected into the drilling hole is corrected to a corresponding value using a third preset correction coefficient of 0.89;

[0073] The first preset condition is that the viscosity of the drilling mud is increased and the adjusted drill bit torque is greater than or equal to the preset torque threshold of 3150 KN·m; the correction difference is the difference between the adjusted drill bit torque and the preset torque threshold.

[0074] Specifically, the adjustment method of the drilling parameters of the next preset characterizing depth segment is determined according to the abnormal drill bit vibration frequency, wherein:

[0075] If the abnormal drill bit vibration frequency is less than the preset frequency threshold of 3 times / min, it is determined that the adjustment method of the drilling parameter of the next preset characterizing depth segment is to reduce the drilling speed of the drilling rig according to the difference between the preset frequency threshold and the abnormal drill bit vibration frequency;

[0076] If the abnormal drill bit vibration frequency is greater than or equal to the preset frequency threshold, the adjustment method of the drilling parameters of the next preset depth segment is determined by increasing the drill bit speed of the drilling rig according to the difference between the abnormal drill bit vibration frequency and the preset frequency threshold.

[0077] Specifically, the reduction amplitude of the drilling speed is positively correlated with the frequency difference, wherein the positive correlation is, for example, a linear positive correlation or a nonlinear positive correlation, and the linear slope of the linear positive correlation is not specifically limited. It can be understood that the larger the frequency difference is, the larger the reduction amplitude of the drilling speed is; the frequency difference is the difference between the preset frequency threshold and the abnormal drill bit vibration frequency.

[0078] Specifically, the process of determining whether the pore formation meets the preset standard according to the pore formation evaluation coefficient includes:

[0079] The hole forming evaluation coefficient is respectively compared with the first preset hole forming value 0.02m 2 and the second preset hole value 0.05m 2 Compare;

[0080] If the hole formation evaluation coefficient is less than the first preset hole formation value, it is determined that the hole formation meets the preset standard, and the steel cage is hoisted and the concrete is poured in sequence to complete the construction of the bored pile;

[0081] If the hole formation evaluation coefficient is greater than or equal to the first preset hole formation value and less than the second preset hole formation value, it is determined that the hole formation does not meet the preset standard, and the preset characterization depth of the next drilling hole is corrected according to the difference between the hole formation evaluation coefficient and the first preset hole formation value;

[0082] If the hole formation evaluation coefficient is greater than or equal to the second preset hole formation value, it is determined that the hole formation does not meet the preset standard, and the hole formation is subjected to hole cleaning processing.

[0083] Specifically, the hole formation evaluation coefficient is the deviation area between the hole formation cross-sectional profile and the designed cross-sectional profile within a unit length of 1 m. It can be understood that the deviation area is calculated by integration.

[0084] Specifically, there are several depth correction methods for correcting the preset characterization depth of the next drilling hole, wherein:

[0085] If the hole correction difference is less than the first preset hole correction difference of 0.01m 2 , then the preset characterization depth of the next drilling hole is corrected to the corresponding value using the first preset depth correction coefficient 0.97;

[0086] If the hole correction difference is greater than or equal to the first preset hole correction difference and less than the second preset hole correction difference 0.02m 2 , then the preset characterization depth of the next drilling hole is corrected to the corresponding value using the second preset depth correction coefficient 0.95;

[0087] If the hole correction difference is greater than or equal to the second preset hole correction difference, the preset characterization depth of the next drilling hole is corrected to a corresponding value using a third preset depth correction coefficient of 0.93;

[0088] The hole formation correction difference is the difference between the hole formation evaluation coefficient and the first preset hole formation value.

[0089] 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.

[0090] 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 construction method for bored piles, characterized in that: include: Clean up the pile foundation construction site and use the total station to stake out the pile positions according to the construction drawings; The casing is buried at the pile position to be constructed, wherein the top of the casing is higher than the ground by a preset distance; Install drilling rig and mud circulation system; Turning on the drilling rig and the mud circulation system to perform drilling construction and obtaining the drilling rig drill bit torque information, drill bit vibration information and mud information within a preset characterization depth section, wherein the mud information includes the viscosity of the injected mud and the viscosity of the output mud; When obtaining the hole formation characteristic coefficient according to the mud information and determining that the drilling of the preset characterization depth section does not meet the preset standard according to the hole formation characteristic coefficient, increasing the viscosity of the mud injected into the drilling of the next preset characterization depth section, or determining the adjustment method of the drilling parameters of the next preset characterization depth section according to the abnormal drill bit vibration frequency; When it is determined according to the hole formation characteristic coefficient that the drilling of the preset characterization depth section meets the preset standard, the drilling construction of the next preset characterization depth section is completed until the drilling depth reaches the design requirement; Using an ultrasonic pore forming detector to detect the pores, obtaining the pore forming cross-sectional profile information, and obtaining the pore forming evaluation coefficient according to the pore forming cross-sectional profile information; When it is determined according to the hole evaluation coefficient that the hole does not meet the preset standard, the preset characterization depth of the next drilling hole is corrected, or the hole is subjected to a hole sweeping process; When it is determined based on the hole formation evaluation coefficient that the hole formation meets the preset standard, the steel cage is hoisted and the concrete is poured in sequence to complete the construction of the bored pile.

2. The construction method of bored pile according to claim 1, characterized in that: The process of determining, according to the hole formation characteristic coefficient, that the drilling hole at the preset characterization depth does not meet the preset standard comprises: Comparing the pore formation characteristic coefficient with a first preset pore formation characteristic coefficient and a second preset pore formation characteristic coefficient respectively; If the hole formation characteristic coefficient is less than the first preset hole formation characteristic coefficient, it is determined that the drilling of this section does not meet the preset standard, and the viscosity of the drilling mud injected into the next preset characterization depth section is increased according to the difference between the first preset hole formation characteristic coefficient and the hole formation characteristic coefficient; If the hole formation characteristic coefficient is greater than or equal to the second preset hole formation characteristic coefficient, it is determined that the drilling of this section does not meet the preset standard, and the adjustment method of the drilling parameters of the next preset characterization depth section is determined according to the abnormal drill bit vibration frequency, wherein a fluctuation in the drill bit lateral vibration amplitude exceeding the preset amplitude threshold is recorded as an abnormal drill bit vibration.

3. The construction method of bored pile according to claim 2, characterized in that: The pore formation characteristic coefficient is a ratio of a change value of the inlet and outlet mud viscosity to a preset viscosity change threshold, wherein the change value of the inlet and outlet mud viscosity is a viscosity difference between the output mud and the injected mud.

4. The construction method of bored pile according to claim 3, characterized in that: Several viscosity adjustment methods are provided for increasing the viscosity of the drilling hole injection slurry, and each viscosity adjustment method increases the viscosity of the drilling hole injection slurry by a different degree.

5. The construction method of bored pile according to claim 4, characterized in that: Under the first preset condition, several viscosity correction methods are set for correcting the viscosity of the drilling mud, and each viscosity correction method has a different correction range for the viscosity of the drilling mud; the first preset condition is that the viscosity of the drilling mud has completed an increase adjustment and the adjusted drill bit torque is greater than or equal to a preset torque threshold.

6. The construction method of bored pile according to claim 5, characterized in that: The adjustment method of the drilling parameters of the next preset characterizing depth segment is determined according to the abnormal drill bit vibration frequency, wherein: If the abnormal drill bit vibration frequency is less than a preset frequency threshold, determining that the adjustment method of the drilling parameter of the next preset characterizing depth segment is to reduce the drilling speed of the drilling rig according to the difference between the preset frequency threshold and the abnormal drill bit vibration frequency; If the abnormal drill bit vibration frequency is greater than or equal to the preset frequency threshold, the adjustment method of the drilling parameters of the next preset depth segment is determined by increasing the drill bit speed of the drilling rig according to the difference between the abnormal drill bit vibration frequency and the preset frequency threshold.

7. The construction method of bored pile according to claim 6, characterized in that: The reduction amplitude of the drilling speed is positively correlated with the frequency difference, wherein the frequency difference is the difference between the preset frequency threshold and the abnormal drill bit vibration frequency.

8. The bored pile construction method according to claim 7, characterized in that: The process of determining, according to the pore formation evaluation coefficient, that the pore formation does not meet the preset standard comprises: Comparing the pore formation evaluation coefficient with the first preset pore formation value and the second preset pore formation value respectively; If the hole formation evaluation coefficient is greater than or equal to the first preset hole formation value and less than the second preset hole formation value, it is determined that the hole formation does not meet the preset standard, and the preset characterization depth of the next drilling hole is corrected according to the difference between the hole formation evaluation coefficient and the first preset hole formation value; If the hole formation evaluation coefficient is greater than or equal to the second preset hole formation value, it is determined that the hole formation does not meet the preset standard, and the hole formation is subjected to hole cleaning processing.

9. The bored pile construction method according to claim 8, characterized in that: The hole formation evaluation coefficient is the deviation area between the hole formation cross-sectional profile and the designed cross-sectional profile within a unit length.

10. The bored pile construction method according to claim 9, characterized in that: Several depth correction methods are provided for correcting the preset characterization depth of the next borehole, and each depth correction method has a different correction range for the preset characterization depth of the next borehole.

Images