A construction method for bored cast-in-place piles

Abstract

The present invention relates to the technical field of civil engineering, and in particular to a construction method for bored piles, comprising: cleaning a pile foundation construction site; burying a casing; installing a drilling rig and a mud circulation system; drilling construction; when it is determined according to a hole formation characteristic coefficient that a hole in a preset characterization depth section does not meet a preset standard, increasing the viscosity of the mud injected into the hole in the next preset characterization depth section, or determining an adjustment method for drilling parameters in the next preset characterization depth section according to an abnormal drill bit vibration frequency; completing the drilling construction of the next preset characterization depth section when it is determined that the hole in the preset characterization depth section meets the preset standard; when it is determined according to a hole formation evaluation coefficient that the hole does not meet the preset standard, correcting the preset characterization depth of the next hole, or performing a hole sweeping process on the hole; and when the hole meets the preset standard, sequentially hoisting a steel cage and pouring concrete, thereby improving hole formation quality.

Description

Technical Field

[0001] The present 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 common foundation treatment method. A pile hole is created in the foundation soil through mechanical drilling, steel pipe extrusion, or manual excavation. A steel cage is placed inside the hole and concrete is poured into the pile. Among the many steps in the construction of cast-in-place piles, the quality of the hole directly affects the bearing capacity of the pile foundation. However, the hole diameter is very susceptible to shrinkage during the drilling process.

[0003] Chinese patent publication number: CN111197305B, discloses a construction method for ultra-long diameter bored piles, including the following 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 testing. The beneficial effects of the present invention are: the present invention adopts a large-diameter drill rod multi-section progressive tooth wheel and a tapered tooth wheel combination drill bit for drilling 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, the risk of surrounding pile foundation collapse is effectively avoided, and the normal use of other accessories and operating equipment and driving safety are ensured. 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 in the prior art of lacking a function of real-time monitoring and control of the drilling process, which results in an inability to promptly handle the shrinkage.

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

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

[0007] The casing is buried at the position where the pile is 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] Starting the drilling rig and the mud circulation system to perform drilling construction and obtaining drill bit torque information, drill bit vibration information, and mud information within a preset characterization depth segment, wherein the mud information includes the viscosity of the injected mud and the viscosity of the output mud;

[0010] When a drilling characteristic coefficient is obtained based on the mud information and it is determined based on the drilling characteristic coefficient that the drilling of the preset characterization depth section does not meet the preset standard, the viscosity of the mud injected into the drilling of the next preset characterization depth section is increased, or an adjustment method of the drilling parameters of the next preset characterization depth section is determined based on 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] Use 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;

[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] Furthermore, the process of determining whether the drilling of the preset characterization depth does not meet the preset standard according to the drilling characteristic coefficient 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 drilling characteristic coefficient is less than the first preset drilling 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 in the next preset characterizing depth section is increased according to the difference between the first preset drilling characteristic coefficient and the drilling characteristic coefficient;

[0018] If the drilling characteristic coefficient is greater than or equal to the second preset drilling 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 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.

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

[0021] Furthermore, under the first preset condition, several viscosity correction methods are provided for correcting the viscosity 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 is increased 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 section 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 parameters of the next preset characterizing depth segment is to reduce the drilling speed of the drill 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 for the drilling parameters of the next preset characterizing depth segment is determined to be 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] Furthermore, the process of determining whether 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 a first preset pore formation value and a 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 sweeping 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 correcting the preset depth of the next borehole, and each depth correction method has a different magnitude of correction for the preset depth of the next borehole. Compared with the prior art, the present invention has the following advantages: the present invention uses the borehole characteristic coefficient to test the quality of the borehole at the preset depth and adjusts the mud parameters, drill bit speed, or drilling speed of the drilling rig to address the shrinkage problem caused by the borehole. At the same time, the borehole evaluation coefficient is used to test the borehole quality to ensure that the borehole 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 meets the preset standard by setting the drilling 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 injection mud.

[0035] Furthermore, the present invention provides several viscosity correction methods for the viscosity of the drilling injection mud, and each viscosity correction method has a different correction range for the viscosity of the drilling injection mud, thereby improving the applicability of the mud viscosity.

[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 construction efficiency.

[0037] Furthermore, the present invention determines whether the pore formation meets the preset standard through the pore formation evaluation coefficient, thereby achieving an accurate assessment 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 This is a flow chart of a construction method for bored cast-in-place piles according to an embodiment of the present invention;

[0040] Figure 2 This is a flow chart of an embodiment of the present invention for determining whether a borehole having a preset characterizing 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 This is a flow chart of an embodiment of the present invention 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 merely used to explain the present invention and are not intended 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 of the three months before the current image processing by the method described in the present invention. It can be understood by those skilled in the art that the method described in the present invention can determine the above parameters for each item by selecting the value with the highest proportion as the preset standard parameter based on 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 described in 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 scope of protection 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 the construction method of 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 the adjustment method of 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 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 includes:

[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;

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

[0051] Step S4: starting the drilling rig and the mud circulation system to perform drilling construction and obtaining drill bit torque information, drill bit vibration information, and mud information within a preset depth segment 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 a drilling characteristic coefficient is obtained based on the mud information and it is determined based on the drilling characteristic coefficient that the drilling of the preset characterization depth section does not meet the preset standard, the viscosity of the mud injected into the drilling of the next preset characterization depth section is increased, or an adjustment method of the drilling parameters of the next preset characterization depth section is determined based on 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 that the hole does not meet the preset standard according to the hole evaluation coefficient, the preset characterization depth of the next drilling hole is corrected, or the hole is subjected to a hole sweeping process;

[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, which is not specifically limited and only needs to meet the drilling requirements.

[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 formation characteristic coefficient is compared with a first preset pore formation characteristic coefficient of 0.65 and a second preset pore formation characteristic coefficient of 1.12 respectively;

[0060] If the drilling characteristic coefficient is less than the first preset drilling 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 in the next preset characterizing depth section is increased according to the difference between the first preset drilling characteristic coefficient and the drilling 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, there are several viscosity adjustment methods for increasing the viscosity of the drilling injection mud, among which:

[0065] If the drilling characteristic difference is less than the first preset drilling characteristic difference of 0.21, the viscosity of the mud injected into the hole is increased by using the first viscosity adjustment coefficient of 1.04;

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

[0067] If the drilling characteristic difference is greater than or equal to the second preset drilling characteristic difference, the viscosity of the slurry injected into the hole is increased using a third viscosity adjustment coefficient of 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 drilling slurry injected into the drilling hole is corrected to the 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 is corrected to the 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 slurry is increased and the adjusted drill bit torque is greater than or equal to a 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 a preset frequency threshold of 3 times / min, determining that the adjustment method of the drilling parameters for the next preset characterizing depth segment is to reduce the drilling speed of the drill 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 for the drilling parameters of the next preset characterizing depth segment is determined to be 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 in drilling speed is positively correlated with the frequency difference, wherein the positive correlation can be, 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 greater the frequency difference, the greater the reduction in drilling speed; 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 comparison;

[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 sweeping processing.

[0083] Specifically, the pore formation evaluation coefficient is the deviation area between the pore 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 use the second preset depth correction coefficient 0.95 to correct the preset characterization depth of the next drilling hole to the corresponding value;

[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 drill hole is corrected to the corresponding value using a third preset depth correction coefficient of 0.93;

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

[0089] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

[0090] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection 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 a total station to stake out the pile positions according to the construction drawings; The casing is buried at the position where the pile is 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; Starting the drilling rig and the mud circulation system to perform drilling construction and obtaining drill bit torque information, drill bit vibration information, and mud information within a preset characterization depth segment, wherein the mud information includes the viscosity of the injected mud and the viscosity of the output mud; When a drilling characteristic coefficient is obtained based on the mud information and it is determined based on the drilling characteristic coefficient that the drilling of the preset characterization depth section does not meet the preset standard, the viscosity of the mud injected into the drilling of the next preset characterization depth section is increased, or an adjustment method of the drilling parameters of the next preset characterization depth section is determined based on 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; Use 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; 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; The hole forming characteristic coefficient is the ratio of the change value of the inlet and outlet mud viscosity to the preset viscosity change threshold, wherein the change value of the inlet and outlet mud viscosity is the viscosity difference between the output mud and the injected mud; The pore forming evaluation coefficient is the deviation area between the pore forming cross-sectional profile and the designed cross-sectional profile per unit length; The process of determining, based on the hole formation characteristic coefficient, that the drill hole at the preset characterization depth does not meet the preset standard includes: 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 drilling characteristic coefficient is less than the first preset drilling 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 in the next preset characterizing depth section is increased according to the difference between the first preset drilling characteristic coefficient and the drilling 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 the 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; The process of determining whether the pore formation does not meet the preset standard according to the pore formation evaluation coefficient includes: Comparing the pore formation evaluation coefficient with a first preset pore formation value and a 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 sweeping processing.

2. The construction method of bored pile according to claim 1, characterized in that: Several viscosity adjustment methods are provided for increasing the viscosity of the drilling slurry, and each viscosity adjustment method increases the viscosity of the drilling slurry by a different amount.

3. The construction method of bored pile according to claim 2, characterized in that: Under the first preset condition, several viscosity correction methods are provided for correcting the viscosity 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 is increased and the adjusted drill bit torque is greater than or equal to a preset torque threshold.

4. The construction method of bored pile according to claim 3, characterized in that: The adjustment method of the drilling parameters of the next preset characterizing depth section 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 parameters of the next preset characterizing depth segment is to reduce the drilling speed of the drill 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 for the drilling parameters of the next preset characterizing depth segment is determined to be 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.

5. The construction method of bored pile according to claim 4, 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.

6. The construction method of bored pile according to claim 5, characterized in that: There are several depth correction methods for correcting the preset characterizing depth of the next drill hole, and each depth correction method has a different correction range for the preset characterizing depth of the next drill hole.

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