Combined hole-forming construction method of silo pile

Abstract

The present application relates to the field of engineering construction technology, and more particularly to a combined hole-forming construction method for a silo pile, comprising: determining a drilling sequence according to a water content evaluation value; determining an initial slurry depth of slurry according to lateral pressure; real-time monitoring; determining whether the construction process of the silo pile hole meets the requirements, and if the determination is that the requirements are met, determining whether the perpendicularity of the silo pile hole meets the requirements according to the included angle between the drill bit and the vertical direction; and if the determination is that the requirements are not met, adjusting the drill bit speed or adjusting the critical depth of slurry replenishment. The present application determines the drilling sequence through the water content, determines whether the drilling start and intermediate process meet the requirements through parameters such as the slurry depth reduction amount and the included angle between the drill bit and the vertical direction, and adjusts the corresponding operating parameters in a timely manner, thereby ensuring the stability during the construction process of the silo pile hole.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engineering construction, and in particular to a combined hole-forming construction method of a silo pile. BACKGROUND

[0002] The pile hole of a building pile foundation is traditionally excavated manually, which has the following disadvantages: high labor intensity, slow single-pile construction speed, and poor safety, which is prone to collapse and other dangerous situations. When the gas produced by humus in the soil layer escapes into the hole, a large amount of toxic gas is deposited at the bottom of the pile hole, which poses a safety hazard to construction safety.

[0003] Chinese Patent Publication No. CN116623648A discloses a rotary digging pile hole-forming construction method, which includes the following steps: S1: rotary digging preparation, including setting out and positioning, and positioning the drill; S2: rotary digging construction, the rotary digging head of the drill slowly rotates into the soil layer to a depth of one cylinder height, the drill stops rotating, and a certain pressure of mud is injected into the side wall of the pile hole through the grouting channel in the rotary digging head; S3: unloading construction, the drill lifts the rotary digging head to one side of the pile hole, and unloading is completed through the unloading mechanism; and S4: returning to step S2 until the rotary digging reaches the set depth. It can be seen that the rotary digging pile hole-forming construction method has the following problems: the state of the pile hole cannot be detected during construction, and the stability of the pile hole during actual drilling cannot be guaranteed. SUMMARY

[0004] Therefore, the present application provides a combined hole-forming construction method of a silo pile to overcome the problem that the stability of the pile hole during actual drilling cannot be guaranteed in the prior art.

[0005] To achieve the above-mentioned purpose, the present application provides a combined hole-forming construction method of a silo pile, which includes the following steps:

[0006] The water content of the center point of the silo pile hole and a plurality of detection points is collected to calculate a water content evaluation value, and the drilling sequence of the silo pile hole is determined according to the water content evaluation value;

[0007] Drilling is performed according to the drilling sequence, the foundation depth is drilled, and the initial mud depth of the mud is determined according to the lateral pressure of the silo pile hole at this time;

[0008] Drilling is performed according to the initial mud depth, and the actual liquid level depth of the mud is monitored in real time;

[0009] Whether the construction accuracy of drilling meets the requirements is determined according to the reduction amount of the actual liquid level depth of the mud in a single detection period;

[0010] If the construction accuracy is determined to meet the requirements, whether the verticality of the silo pile hole meets the requirements is determined according to the included angle between the drill bit and the vertical direction;

[0011] If the verticality of the silo pile hole is determined to not meet the requirements, secondary drilling is performed and the initial drilling depth during the secondary drilling is re-determined;

[0012] If the construction accuracy is determined to not meet the requirements, the drill bit speed is adjusted according to the drill bit temperature, or the critical depth of mud supplementing is adjusted.

[0013] Further, the step of determining the drilling sequence of the silo pile hole according to the water content evaluation value comprises:

[0014] Positioning the center position of the silo pile hole according to the construction drawing;

[0015] Selecting one-half hole diameter and one-third hole diameter positions outward from the center position as detection points and measuring the water content of each detection point;

[0016] Calculating the water content evaluation value according to the measured water content, and the water content evaluation value of each drilling hole is positively correlated with the priority of construction.

[0017] Further, the step of obtaining the water content evaluation value comprises:

[0018] Determining the center position of the silo pile hole;

[0019] Determining the number of water content measurement points according to the hole diameter of the silo pile hole;

[0020] Measuring the water content at the center position and the measurement points, respectively;

[0021] Calculating the water content evaluation value according to each water content;

[0022] Setting the water content evaluation value, wherein S is the water content of the center position, Si is the water content at the i-th detection point, and S is the average value of the water content at each detection point.

[0023] Further, the step of determining the initial mud depth when the mud is first injected comprises:

[0024] Drilling the foundation depth at the position of the silo pile hole;

[0025] Measuring the lateral pressure of the soil on the hole wall and comparing it with the preset first-level lateral pressure and the preset second-level lateral pressure;

[0026] Adjusting the initial mud depth according to the corresponding depth adjustment coefficient selected according to the comparison result.

[0027] Further, the step of determining whether the construction process of the silo pile hole meets the requirement according to the reduction amount of the mud depth in a single detection period comprises:

[0028] During the drilling process of the silo pile hole, the reduction amount of the mud depth in a detection period is obtained;

[0029] The reduction amount of the mud depth is compared with a preset first reduction amount and a preset second reduction amount, respectively;

[0030] If the reduction amount of the mud depth is less than the preset first reduction amount, it is determined that the construction process of the silo pile hole meets the requirement, and whether the verticality of the silo pile hole meets the requirement is determined according to the verticality;

[0031] If the reduction amount of the mud depth is greater than or equal to the preset first reduction amount and less than or equal to the preset second reduction amount, it is determined that the construction process of the silo pile hole does not meet the requirement, and the drill bit speed is reduced to a corresponding value according to the drill bit temperature;

[0032] If the reduction amount of the mud depth is greater than the preset second reduction amount, it is determined that the construction process of the silo pile hole does not meet the requirement, and the critical depth of mud supplementing is increased to a corresponding value according to the reduction amount difference.

[0033] Further, whether the verticality of the silo pile hole meets the requirement is determined according to the angle between the drill bit and the vertical direction,

[0034] If the angle between the drill bit and the vertical direction is less than a preset angle, it is determined that the construction process of the silo pile meets the requirement;

[0035] If the angle between the drill bit and the vertical direction is greater than or equal to the preset angle, it is determined that the construction process of the silo pile does not meet the requirement, secondary drilling is performed, and the initial depth during the secondary drilling is determined according to the angle difference.

[0036] Further, the magnitude of the reduction of the drill bit speed is determined according to the drill bit temperature.

[0037] Further, the increase of the critical depth of mud supplementing to a corresponding value is determined according to the reduction amount difference;

[0038] The reduction amount difference is the difference between the reduction amount and the preset second reduction amount.

[0039] Further, the number of the measurement points of the water content is determined according to the hole diameter of the silo pile hole.

[0040] Further, the initial depth during the secondary drilling is determined according to the angle difference.

[0041] The included angle difference is the difference between the included angle and the preset included angle.

[0042] Compared with the prior art, the beneficial effects of the present application are that the present application determines the drilling sequence by the water content, determines whether the start and the intermediate process of drilling meet the requirements by the reduction amount of the mud depth, the included angle between the drill bit and the vertical direction and other parameters, and adjusts the corresponding operating parameters in time when it is determined that the standards are not met, thereby ensuring the stability in the silo pile hole construction process.

[0043] Further, the present application detects the water content and calculates the water content evaluation value, compares the water content of each silo pile hole corresponding position by the water content evaluation value, and gives priority to the silo pile hole with higher water content and unstable soil, and then carries out subsequent pouring and other links, thereby avoiding the influence of the silo pile hole with high water content drilled later on the silo pile that has been constructed, and further ensuring the stability in the silo pile hole construction process.

[0044] Further, the present application measures the lateral pressure and compares it with the preset standard, thereby selecting the corresponding initial mud depth of the mud, so as to hang enough thickness of mud on the inner wall of the silo pile hole, thereby avoiding the collapse of the silo pile hole caused by the extrusion of the soil around the hole wall due to insufficient mud, and further ensuring the stability in the silo pile hole construction process.

[0045] Further, the present application compares the reduction amount with the preset standard, thereby evaluating the situation under the drill bit and the silo pile hole by the mud consumption, and the case that the mud consumption is too high may be that the mud water evaporates due to the high temperature of the drill bit or the drill bit is damaged, so that large soil blocks cannot be uniformly cut, thereby large pore voids appear, and the two cases are distinguished by the mud consumption, thereby adjusting the operating parameters in time after determining the cause, and further ensuring the stability in the silo pile hole construction process.

[0046] Further, the present application calculates the difference between the drill bit temperature and the reduction amount and compares it with the preset standard, thereby adjusting the drill bit speed and the critical depth in time according to the actual situation, and further ensuring the stability in the silo pile hole construction process. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 The step flow chart of the combined hole forming construction method of the silo pile of the present application;

[0048] Figure 2 The step flow chart of confirming the drilling sequence of the silo pile hole according to the water content of the present application;

[0049] Figure 3A flow chart of the step of determining the initial depth of the secondary drilling hole according to the application;

[0050] Figure 4 A flow chart of the step of determining the rotation speed reduction of the drill bit according to the application. DETAILED DESCRIPTION

[0051] In order to make the objects and advantages of the present application clearer, the following further describes the present application with reference to the embodiments. It should be understood that the specific embodiments described herein are merely used to explain the present application and should not be used to limit the present application.

[0052] The preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that the embodiments are merely used to explain the technical principles of the present application and should not be used to limit the protection scope of the present application.

[0053] It should be noted that, in the description of the present application, the terms of direction or position relationship such as "upper", "lower", "left", "right", "inner" and "outer" are based on the direction or position relationship shown in the drawings, which 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, and therefore should not be understood as a limitation on the present application.

[0054] In addition, it should also be noted that, in the description of the present application, unless otherwise explicitly specified and limited, the terms of "mounting", "connecting" and "connection" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, and can be the communication inside two elements. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0055] Please refer to Figure 1 The figure is a flow chart of the step of the combined hole-forming construction method of the silo pile according to the present application, which comprises:

[0056] Step S1, collecting the water content of the silo pile hole center point and a plurality of detection points to calculate the water content evaluation value, and determining the drilling sequence of the silo pile hole according to the water content evaluation value;

[0057] Step S2, drilling according to the drilling sequence, drilling the foundation depth, and determining the initial mud depth of the mud according to the lateral pressure of the silo pile hole at this time;

[0058] Step S3, drilling according to the initial mud depth and monitoring the actual liquid level depth of the mud in real time;

[0059] Step S4, whether the construction accuracy of the drilling hole meets the requirements is determined according to the actual liquid level depth reduction of the mud in a single detection period;

[0060] If it is determined that the construction accuracy meets the requirements, whether the verticality of the silo pile hole meets the requirements is judged according to the included angle between the drill bit and the vertical direction;

[0061] If it is determined that the verticality of the silo pile hole does not meet the requirements, secondary drilling is performed and the initial depth of the drill bit during secondary drilling is re-determined;

[0062] If it is determined that the construction accuracy does not meet the requirements, the drill bit speed is adjusted according to the drill bit temperature, or the critical depth of mud supplementing is adjusted.

[0063] Please refer to Figure 2 The step flow chart for confirming the drilling sequence of the silo pile hole according to the water content is shown in the figure, and the step for confirming the drilling sequence of the silo pile hole according to the water content comprises:

[0064] The center position of the silo pile hole is positioned according to the construction drawing;

[0065] A plurality of positions of one-half hole diameter and one-third are selected as detection points outside the center position, and the water content of each detection point is measured;

[0066] The water content evaluation value is calculated according to the measured water content, and each silo pile hole is constructed in turn from high to low according to the water content evaluation value.

[0067] Specifically, the calculation method of the water content evaluation value is:

[0068] The center point of the silo pile hole is determined;

[0069] The number of water content measurement points is determined according to the hole diameter of the silo pile hole;

[0070] The water content at the center point and the measurement point is measured respectively;

[0071] The water content evaluation value is calculated according to each water content;

[0072] The water content evaluation value is set as Wherein: S 中 The center point water content, Si is the water content at the ith detection point, i=1, 2, 3...n, The average value of the water content at each detection point.

[0073] The water content measurement method in the embodiment of the application is an in-situ test method, and the specific steps are as follows:

[0074] Select test location:

[0075] Using a portable soil moisture meter, such as a TDR or conductivity meter, the test probe is inserted into the soil layer to directly measure the soil moisture content.

[0076] Record the depth and corresponding moisture content value for each test point.

[0077] Specifically, the steps for determining the initial mud depth during the first mud injection include:

[0078] Drill the foundation to the required depth at the location of the silo pile holes;

[0079] The magnitude of the lateral pressure exerted by the soil on the borehole wall was measured and compared with the preset first-level lateral pressure and the preset second-level lateral pressure.

[0080] If the lateral pressure is less than the preset first-level lateral pressure, the initial mud depth is adjusted to the corresponding value using a first depth adjustment coefficient; the preferred embodiment of the preset first-level lateral pressure is 0.25 MPa, and the preferred embodiment of the first depth adjustment coefficient is 1.00;

[0081] If the lateral pressure is greater than or equal to the preset first-level lateral pressure and less than or equal to the preset second-level lateral pressure, the initial mud depth is adjusted to the corresponding value using a second depth adjustment coefficient; the preferred embodiment of the preset second-level lateral pressure is 0.3 MPa, and the preferred embodiment of the second depth adjustment coefficient is 1.20;

[0082] If the lateral pressure is greater than the preset secondary lateral pressure, the initial mud depth is adjusted to the corresponding value using a third depth adjustment coefficient; a preferred embodiment of the third depth adjustment coefficient is 1.40.

[0083] According to technical specifications, the acceptable range for the pressure exerted by the borehole wall on the drilling mud during pile foundation construction is as follows:

[0084] Shallow soil layer (≤20m): ≤0.3MPa;

[0085] Medium-deep soil layers (20-50m): 0.3-0.5MPa;

[0086] Deep soil layers (>50m): 0.5-0.8MPa;

[0087] In this embodiment of the invention, the lateral pressure is detected by an in-hole pressure tester, which is used to measure the pressure change of the borehole wall on the protective mud during the drilling process.

[0088] In this embodiment of the invention, the initial mud depth is determined to be 0.6m based on the actual conditions of the construction site;

[0089] Specifically, if the second depth adjustment coefficient is selected to adjust the initial mud depth, the adjusted initial mud depth is 0.6*1.20=0.72 m.

[0090] The step of determining whether the construction process of the silo pile hole meets the requirements according to the reduction of the mud depth in the detection period includes:

[0091] During the drilling process of the silo pile hole, the reduction of the mud depth in the detection period (30 min) is obtained;

[0092] The reduction of the mud depth of the mud height is compared with the preset first reduction and the preset second reduction, respectively;

[0093] If the reduction of the mud depth is less than the preset first reduction, it is determined that the construction process of the silo pile hole meets the requirements, and whether the verticality of the silo pile hole meets the requirements is determined according to the verticality;

[0094] If the reduction of the mud depth is greater than or equal to the preset first reduction and less than or equal to the preset second reduction, it is determined that the construction process of the silo pile hole does not meet the requirements, and the drill bit speed is reduced to a corresponding value according to the drill bit temperature;

[0095] If the reduction is greater than the preset second reduction, it is determined that the construction process of the silo pile hole does not meet the requirements, and the critical depth of mud supplementing is increased to a corresponding value according to the reduction difference.

[0096] Specifically, the preset first reduction is determined by selecting a test pile for testing, detecting the reduction of the mud depth of the drilling machine under standard conditions, the drilling time in a detection period, and the interval of the mud depth being (0.1 m, 0.2 m), all of which meet the construction requirements. In the embodiment of the present application, the preferred embodiment of the preset first reduction is 0.2 m.

[0097] Specifically, it is known through multiple experiments that the drilling speed of the drill bit affects the mud depth in the range of (0.25 m, 0.30 m). In the embodiment of the present application, the preferred embodiment of the preset second reduction is 0.28 m.

[0098] Specifically, whether the verticality of the silo pile hole meets the requirements is determined according to the angle between the drill bit and the vertical direction,

[0099] If the angle between the drill bit and the vertical direction is less than the preset angle, it is determined that the construction process of the silo pile meets the requirements. In the embodiment of the present application, the preferred embodiment of the preset angle is 10°.

[0100] If the included angle between the drill bit and the vertical direction is greater than or equal to the preset included angle, it is judged that the construction process of the silo pile does not meet the requirements, secondary drilling is carried out, and the initial depth during secondary drilling is determined according to the included angle difference value;

[0101] According to the Building Foundation Engineering Construction Quality Acceptance Standard, the verticality deviation of a column pile is not greater than 4% of the pile diameter. The maximum value of the included angle is 15°, which is determined according to the actual situation and the performance of the drill bit.

[0102] Please refer to Figure 3 As shown in the accompanying drawings, it is a step flow chart of the determination method of the initial depth during secondary drilling, which includes:

[0103] If the included angle difference value is greater than the preset first included angle difference value, the first determination coefficient is selected to determine the initial depth during secondary drilling. The preferred embodiment of the preset first included angle difference value is 8°, and the preferred embodiment of the first determination coefficient is 0.40.

[0104] If the included angle difference value is less than or equal to the preset first included angle difference value and greater than or equal to the preset second included angle difference value, the second determination coefficient is selected to determine the initial depth during secondary drilling. The preferred embodiment of the preset second included angle difference value is 5°, and the preferred embodiment of the second determination coefficient is 0.55.

[0105] If the included angle difference value is less than the preset second included angle difference value, the third determination coefficient is selected to determine the initial depth during secondary drilling. The preferred embodiment of the third determination coefficient is 0.75.

[0106] The included angle difference value is the difference between the included angle and the preset included angle.

[0107] Specifically, if the measured included angle of the drill bit is 17.25° when the current drilling depth is 12 meters, it is judged that the verticality is unqualified and needs to be drilled again, the included angle difference value is 17.25°-10°=7.25°, and it is determined that the second determination coefficient is selected to determine the initial depth during secondary drilling, i.e. the initial depth during secondary drilling is: second determination coefficient x current drilling depth = 12m x 0.55 = 6.6m.

[0108] Please refer to Figure 4 As shown in the accompanying drawings, it is a determination flow chart of the reduced speed of the drill bit, in which:

[0109] If the drill bit temperature is greater than the preset first drill bit temperature, the first speed adjustment coefficient is used to reduce the drill bit speed to the corresponding value. The preferred embodiment of the preset first drill bit temperature is 270℃, and the preferred embodiment of the first speed adjustment coefficient is 0.95.

[0110] If the drill bit temperature is less than or equal to the preset first drill bit temperature and greater than or equal to the preset second drill bit temperature, the drill bit rotation speed is reduced to a corresponding value using a second rotation speed adjustment coefficient; a preferred embodiment of the preset second drill bit temperature is 220 DEG C, and a preferred embodiment of the second rotation speed adjustment coefficient is 0.85;

[0111] If the drill bit temperature is less than the preset second drill bit temperature, the drill bit rotation speed is reduced to a corresponding value using a third rotation speed adjustment coefficient; a preferred embodiment of the third rotation speed adjustment coefficient is 0.75;

[0112] The drill bit temperature is measured by a directly installed temperature sensor arranged on the drill bit;

[0113] According to the calculation condition of the drill bit temperature, the optional range of the drill bit temperature is (200 DEG C, 400 DEG C);

[0114] Specifically, the increasing mode of the critical depth of mud supplementing is:

[0115] If the reduction difference is greater than a preset first reduction difference, the critical depth of mud supplementing is increased to a corresponding value using a first critical adjustment coefficient; a preferred embodiment of the preset first reduction difference is 0.15, and a preferred embodiment of the first critical adjustment coefficient is 1.30;

[0116] If the reduction difference is less than or equal to the preset first reduction difference and greater than or equal to a preset second reduction difference, the critical depth of mud supplementing is increased to a corresponding value using a second critical adjustment coefficient; a preferred embodiment of the preset second reduction difference is 0.30, and a preferred embodiment of the second critical adjustment coefficient is 1.20;

[0117] If the reduction difference is less than the preset second reduction difference, the critical depth of mud supplementing is increased to a corresponding value using a third critical adjustment coefficient; a preferred embodiment of the third critical adjustment coefficient is 1.10;

[0118] The reduction difference is the difference between the reduction and the preset second reduction;

[0119] In the embodiment of the application, the critical depth is 0.2 m. When the critical depth is reached, the mud must be supplemented immediately, and according to the calculation condition of the reduction difference, the optional range of the reduction difference is (0, 0.32 m), which needs to be selected in combination with the actual situation;

[0120] Through multiple tests, it is known that when the number of measurement points in the central position to the outer one-half bore diameter and the number of two-thirds bore diameter are each three times or more than the silo pile hole diameter, the calculated water content evaluation value is representative;

[0121] In the embodiment of the present application, the determination mode of the number of the measuring points of the water content is: the value of the silo pile hole diameter × 3.0, wherein the unit of the silo pile hole diameter is meter, and if a decimal number appears, the integer is rounded up;

[0122] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without deviating from the principles of the present application, and the technical solutions after these changes or replacements will all fall within the protection scope of the present application.

Claims

1. A method of combined hole formation of a silo pile, characterized by, The method comprises the following steps: Collecting the moisture content of the center point and several detection points of the silo pile hole to calculate the moisture content evaluation value, and determining the drilling sequence of the silo pile hole according to the moisture content evaluation value; The step of determining the drilling sequence of the silo pile hole according to the moisture content evaluation value comprises: Positioning the center position of the silo pile hole according to the construction drawing; Selecting one-half hole diameter and one-third hole diameter as detection points outward from the center position and measuring the moisture content of each detection point; Calculating the moisture content evaluation value according to the measured moisture content, and the moisture content evaluation value of each drilling hole is positively correlated with the priority of construction; Drilling according to the drilling sequence, drilling to the foundation depth, and determining the initial mud depth of the mud according to the lateral pressure of the silo pile hole at this time; Drilling according to the initial mud depth and monitoring the actual liquid level depth of the mud in real time; Determining whether the construction accuracy of drilling meets the requirements according to the reduction amount of the actual liquid level depth of the mud in a single detection period; If it is determined that the construction accuracy meets the requirements, then determining whether the verticality of the silo pile hole meets the requirements according to the angle between the drill bit and the vertical direction; If it is determined that the verticality of the silo pile hole does not meet the requirements, then performing secondary drilling and re-determining the initial depth of the drill bit during secondary drilling; If it is determined that the construction accuracy does not meet the requirements, then adjusting the rotation speed of the drill bit according to the temperature of the drill bit, or adjusting the critical depth of mud supplementing according to the reduction amount of the actual liquid level depth of the mud in a single detection period; The step of determining whether the construction accuracy of the silo pile hole meets the requirements according to the reduction amount of the actual liquid level depth of the mud in a single detection period comprises: During the drilling of the silo pile hole, the reduction amount of the mud depth in a detection period is obtained; Comparing the reduction amount of the actual liquid level depth of the mud with a preset first reduction amount and a preset second reduction amount respectively; If the reduction amount of the actual liquid level depth of the mud is less than the preset first reduction amount, it is determined that the construction accuracy of the silo pile hole meets the requirements, and whether the verticality of the silo pile hole meets the requirements is determined according to the verticality; If the reduction amount of the actual liquid level depth of the mud is greater than or equal to the preset first reduction amount and less than or equal to the preset second reduction amount, it is determined that the construction accuracy of the silo pile hole does not meet the requirements, and the rotation speed of the drill bit is reduced to a corresponding value according to the temperature of the drill bit; If the reduction amount of the actual liquid level depth of the mud is greater than the preset second reduction amount, it is determined that the construction accuracy of the silo pile hole does not meet the requirements, and the critical depth of mud supplementing is increased to a corresponding value according to the reduction amount difference; Determining whether the verticality of the silo pile hole meets the requirements according to the angle between the drill bit and the vertical direction comprises: If the angle between the drill bit and the vertical direction is less than a preset angle, it is determined that the construction process of the silo pile meets the requirements; If the angle between the drill bit and the vertical direction is greater than or equal to the preset angle, it is determined that the construction process of the silo pile does not meet the requirements, secondary drilling is performed, and the initial depth during secondary drilling is determined according to the angle difference; The step of determining the initial mud depth when the mud is first injected comprises: Drilling to the foundation depth at the position of the silo pile hole; The lateral pressure of the soil on the borehole wall is measured and compared with a preset first lateral pressure and a preset second lateral pressure; According to the comparison result, a corresponding depth adjustment coefficient is selected to adjust the initial mud depth.

2. A method of jointed hole formation for silo piles according to claim 1, characterised in that, The magnitude of the decrease in the rotation speed of the drill bit is determined according to the temperature of the drill bit.

3. A method of jointed hole formation for silo piles according to claim 2, characterised in that, The critical depth of mud supplement is increased to a corresponding value determined according to the difference between the decrease and the preset second decrease. The difference between the decrease and the preset second decrease is the difference value.

4. A method of jointed hole formation for silo piles according to claim 3, characterised in that, The initial depth during the secondary drilling is determined according to a difference in the included angle; The difference in the included angle is the difference between the included angle of the drill bit with the vertical direction and the preset included angle.

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