A bridge drilling method with adaptive adjustment function

Abstract

The present invention relates to the technical field of soil layer drilling, and specifically to a bridge drilling method with an adaptive adjustment function, which obtains the drilling rate characteristics of the drill bit in the current time period, and the vibration intensity of the drill bit in the current time period; based on the drilling rate characteristics and the vibration intensity, the soil hardness characteristics of the drill bit in the current time period are obtained; according to the soil hardness characteristics and the current mud density characteristics of the drill bit in the current time period, the drill bit speed can be effectively and accurately adjusted. At the same time, the present invention can analyze the current mud density of the drill bit in the current time period, avoiding the risk of hole collapse and shrinkage caused by the mismatch between the soil layer and mud density and the drill bit speed, and reducing the risk of poor bridge hole formation.

Description

Technical Field

[0001] The invention relates to the technical field of soil layer drilling, and in particular to a bridge drilling method with an adaptive adjustment function. Background Art

[0002] The pile foundation of a bridge is an important component that supports the entire bridge structure. Through drilling construction, the position, depth and diameter of the pile foundation can be controlled more accurately, which helps to improve the quality of the entire bridge project. The bridge hole forming process is often achieved by mud wall bored pile operation. During the mud wall drilling process, the rotary drilling rig continuously digs and drills holes at the target pile foundation position through the downward thrust of the drill rod combined with the rotation force of the drill bit. In order to ensure that the holes in some soft soil layers will not collapse during the drilling process, a certain density of mud is continuously injected into the hole during the drilling process to strengthen the hole wall. Then, the holes of the mud wall bored pile are poured with underwater concrete, etc., so as to obtain a more stable bridge pile foundation.

[0003] During the construction of mud wall cast-in-place piles, the drill bit speed of the rotary drilling rig is often adjusted according to the different depth characteristics of the soil layer during the hole forming process. For example, when the drill bit is in the shallow soil layer, the soil is relatively soft and there are fewer hard rocks in the soil layer. At this time, the drill rod thrust can be reduced and the drilling can be accelerated by relying on a higher drill bit speed; when the drill bit is in the deep soil layer, the soil is relatively hard and there are more hard rocks in the soil layer. At this time, the drill rod thrust should be increased and the drill bit speed should be reduced to effectively break the hard rocks with a higher drill rod thrust. Therefore, if the drill bit speed of the rotary drilling rig is properly adjusted, the drilling efficiency can be effectively improved.

[0004] However, the traditional method of adjusting the drill bit speed of the rotary drilling rig only according to the depth of the soil layer still has room for improvement, that is, in the actual drilling process, there may be a small amount of hard rock in the shallow soil layer, and the distribution of material hardness in the deep soil layer is also uneven. Therefore, the precise hardness of the soil material cannot be accurately reflected based on the soil layer depth information alone, which leads to improper adjustment of the drill bit speed of the rotary drilling rig, thereby reducing the hole-forming accuracy of the bridge. Summary of the invention

[0005] In view of this, in order to solve the technical problem of improper adjustment of the drill speed of a rotary drilling rig, the present invention provides a bridge drilling method with an adaptive adjustment function.

[0006] The technical solutions adopted are as follows:

[0007] An embodiment of the present invention provides a bridge drilling method with an adaptive adjustment function, comprising:

[0008] Obtain the drilling rate characteristics of the drill bit in the current time period and the vibration severity of the drill bit in the current time period;

[0009] Based on the drilling rate characteristics and the vibration intensity, obtaining the soil hardness characteristics of the drill bit in the current time period;

[0010] At least the rotation speed of the drill bit is adjusted according to the soil hardness characteristics and the current mud density characteristics of the drill bit in the current time period.

[0011] In some possible implementations, the process of obtaining the vibration severity includes:

[0012] Obtaining the deviation hole angle of the drill bit at each sampling moment in the current time period to obtain a deviation hole angle set;

[0013] The variance of the offset hole angle set is obtained to obtain the vibration severity.

[0014] In some possible implementations, based on the drilling rate characteristics and the vibration severity, obtaining the soil hardness characteristics of the drill bit in the current time period includes:

[0015] Obtaining an average value of the offset hole angles in the offset hole angle set;

[0016] According to the average value of the deviation hole angle and the intensity of the vibration, the deviation hole degree is obtained, and the deviation hole degree is positively correlated with the average value of the deviation hole angle and the intensity of the vibration;

[0017] The soil hardness characteristic is obtained according to the degree of hole deviation and the drilling rate characteristic. The soil hardness characteristic is positively correlated with the degree of hole deviation and negatively correlated with the drilling rate characteristic.

[0018] In some possible implementations, at least the rotation speed of the drill bit is adjusted according to the soil hardness characteristics and the current mud density characteristics of the drill bit in the current time period, including:

[0019] According to the soil hardness characteristics and the current mud density characteristics, a rotation speed adjustment coefficient of the drill bit is obtained, and the rotation speed adjustment coefficient is positively correlated with the soil hardness characteristics and the current mud density characteristics;

[0020] The rotation speed of the drill bit is adjusted according to the rotation speed adjustment coefficient.

[0021] In some possible implementations, adjusting the rotation speed of the drill bit according to the rotation speed adjustment coefficient includes:

[0022] The target speed of the drill bit is obtained according to the speed adjustment coefficient and the rated speed of the drill bit, and the speed of the drill bit is adjusted to the target speed.

[0023] In some possible implementations, the process of acquiring the current mud viscosity characteristic includes:

[0024] Obtaining a current depth ratio of the drill bit, where the depth ratio is a ratio of a current drilling depth of the drill bit to a target depth of the drill bit;

[0025] The original mud density in the mud pool is obtained, and the product of the depth ratio and the original mud density is normalized and used as the current mud density feature.

[0026] In some possible implementations, at least adjusting the rotation speed of the drill bit includes: adjusting the rotation speed of the drill bit and the thrust of the drill rod of the rotary drilling rig.

[0027] In some possible implementations, the thrust of the drill pipe of the rotary drilling rig is adjusted, including:

[0028] According to the difference between the current real-time rotation speed of the drill bit and the rated rotation speed of the drill bit, the power intensity characteristic of the drill bit is obtained;

[0029] Based on the drill bit power intensity characteristic, a drill rod thrust adjustment coefficient is obtained; the drill rod thrust adjustment coefficient is inversely correlated with the drill bit power intensity characteristic;

[0030] According to the drill rod thrust adjustment coefficient and the drill rod thrust rated value, a drill rod thrust target value is obtained, and the drill rod thrust of the rotary drilling rig is adjusted to the drill rod thrust target value.

[0031] In some possible implementations, the drill bit power intensity characteristic is the ratio of the current real-time rotation speed of the drill bit to the rated rotation speed of the drill bit; and the drill rod thrust adjustment coefficient is equal to the value 1 minus the drill bit power intensity characteristic.

[0032] In some possible implementations, the drilling rate characteristic is obtained by the drilling depth of the drill bit in a current time period and the time length of the current time period.

[0033] The present invention has technical effects including but not limited to the following: since soil hardness has a great influence on the rotation speed of the drill bit, accurate and reliable soil hardness characteristics can be obtained according to the drilling rate characteristics of the drill bit in the current time period and the vibration intensity of the drill bit in the current time period, which is used to improve the accuracy of drill bit speed adjustment. At the same time, the soil hardness characteristics are obtained in combination with the drilling rate characteristics of the drill bit in the current time period and the vibration intensity of the drill bit in the current time period. Compared with the existing method of obtaining the soil hardness only based on the depth of the soil layer, the accuracy of soil hardness detection can be improved; and since the current mud density characteristics of the current time period of the drill bit also affect the rotation speed of the drill bit, the drill bit speed can be effectively and accurately adjusted according to the soil hardness characteristics and the current mud density characteristics of the current time period of the drill bit. Compared with the traditional method of adjusting the speed only based on the depth of the soil layer, the present invention can obtain more accurate soil hardness information, and thus obtain more accurate adjustment results. At the same time, the present invention can analyze the current mud density characteristics of the drill bit in the current time period, avoiding the risk of hole collapse and shrinkage caused by the mismatch between the soil layer and mud density and the drill bit rotation speed, and reducing the risk of poor bridge hole formation. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a flow chart of a bridge drilling method with an adaptive adjustment function provided by the present invention;

[0035] Figure 2 is a flowchart of the implementation process of step S1;

[0036] Figure 3 is a flow chart of the implementation process of step S2;

[0037] Figure 4 is a flow chart of the implementation process of step S3;

[0038] Figure 5 It is a flow chart of the process of obtaining the current mud density characteristics;

[0039] Figure 6 It is a process flow chart for adjusting the thrust of the drill rod of the rotary drilling rig;

[0040] Figure 7 It is a structural principle diagram of a bridge drilling system with adaptive adjustment function;

[0041] Figure 8 It is a structural schematic diagram of a computer-readable storage medium. DETAILED DESCRIPTION

[0042] The present embodiment provides a bridge drilling method with an adaptive adjustment function, which is applicable to a rotary drilling rig and is used to control the rotary drilling rig. The application scenario of the rotary drilling rig is to drill holes for the pile foundation of the bridge. The bridge hole is often formed by mud wall cast-in-place pile construction, and then concrete is poured into the hole to obtain the bridge pile foundation. The rotary drilling rig is used to form holes during the mud wall cast-in-place pile process. The rotary drilling rig mainly relies on the downward thrust of the drill rod and the speed of the drill bit to break the soil layer and dig holes downward.

[0043] During the drilling process, traditional rotary drilling rigs only rely on the depth information of the soil layer to adjust the drill bit speed. That is, the soil layer is softer in the shallower soil layer, and there are fewer hard rocks; the soil layer is harder in the deeper soil layer, and there are more hard rocks. In this way, a lower drill rod thrust is applied to the shallow soil layer, and the soil layer is quickly drilled through by relying on a higher drill bit speed. At the same time, a lower drill bit speed is applied to the deep soil layer, and the hard rock is broken by relying on a higher drill rod thrust.

[0044] However, the accuracy of reflecting the softness and hardness of the soil material based only on the depth information is not high, and at the same time, it is not combined with the mud density characteristics during the mud wall protection process for analysis. That is, when the soil is soft and the mud density is high, a higher drill speed may be applied, resulting in hole collapse, or when the soil is hard and the mud density is low, a lower drill speed may be applied, resulting in hole shrinkage. Therefore, this embodiment is improved according to the above scenario problems, and the adaptive and precise adjustment of the drill speed during the construction of the rotary drilling rig is achieved. The bridge drilling method is used to adjust the drill speed of the rotary drilling rig in real time during the drilling of the bridge mud wall cast-in-place piles, so as to improve the hole-forming efficiency of the bridge pile foundation.

[0045] like Figure 1 As shown, the bridge drilling method comprises the following steps:

[0046] Step S1: Obtain the drilling rate characteristics of the drill bit in the current time period and the vibration severity of the drill bit in the current time period.

[0047] This embodiment uses time periods as data analysis objects. When acquiring data, data information of each time period is acquired. The length of the time period is set according to actual needs. In order to more accurately reflect the data characteristics, the length of the time period should not be too long. This embodiment takes 1 second as an example. Therefore, a time period can be regarded as a unit time length. The time period includes multiple sampling moments. The time interval between adjacent sampling moments, that is, the length of the sampling period, is set according to actual needs, such as 0.05 seconds.

[0048] The current time period is set, and the end time of the current time period is the current time. The drilling rate characteristics of the drill bit in the current time period and the vibration intensity of the drill bit in the current time period are obtained.

[0049] Among them, the drilling rate characteristic characterizes the characteristic situation of the drilling rate of the drill bit in the current time period. The drilling rate is the depth rate of the drill bit drilling downward, that is, the drilling rate. As a specific implementation method, the drilling depth of the drill bit in the current time period is obtained, that is, the depth of the drill bit drilling downward within the time length of the current time period, and then the drilling depth of the current time period is compared with the time length of the current time period. The result obtained is the drilling rate characteristic of the drill bit in the current time period. It should be understood that sensors such as depth gauges or depth sensors are provided inside the rotary drilling rig to detect and obtain the depth data of the drill bit at each sampling moment. Among them, the setting position of sensors such as depth gauges or depth sensors cannot affect the normal operation of the rotary drilling rig.

[0050] The vibration intensity of the drill bit in the current time period is obtained, wherein the vibration intensity is used to characterize the vibration intensity of the drill bit in the current time period, and the higher the vibration intensity, the more intense the vibration of the drill bit. The vibration data of the drill bit can be detected by a vibration sensor arranged at the drill bit, wherein the specific installation position of the vibration sensor in the drill bit is set according to the actual situation, but it cannot affect the normal operation of the rotary drilling rig. In addition, since the direction of the drill bit is vertically downward under normal circumstances, if the angle of the drill bit deviates from vertically downward, it means that the drill bit has a deviated hole, that is, the drill bit has vibrated, and the larger the deviated hole angle of the drill bit, the more severe the vibration. Therefore, as another embodiment, a sensor for detecting angles such as an azimuth meter is arranged in the rotary drilling rig, and the vibration is characterized by the detected deviated hole angle to obtain the vibration intensity of the drill bit.

[0051] Step S2: Based on the drilling rate characteristics and the vibration intensity, the soil hardness characteristics of the drill bit in the current time period are obtained.

[0052] Considering the difference in hardness of soil at different locations, different drill bit speeds should be set for soils of different hardness. That is, when the soil is soft, a lower drill rod thrust should be set, and the drill bit speed should be increased to accelerate drilling; when the soil is hard, a lower drill bit speed should be set, and the drill rod thrust should be increased to break the rock. Therefore, it is necessary to judge the hardness information of the soil at the real-time drill bit.

[0053] Different soil hardness will affect the drilling rate in one aspect. When the drill bit encounters harder soil or rock during the drilling process, the drilling rate will drop suddenly. That is, the lower the drilling rate, the harder the soil. Conversely, the higher the drilling rate, the softer the soil.

[0054] Moreover, different soil hardness will also affect the intensity of drill bit vibration. The collision between the drill bit and hard materials will cause the drill bit to vibrate, which in turn leads to a larger deviation angle of the drill bit. That is, the harder the soil, the more intense the vibration of the drill bit. Conversely, the softer the soil, the less intense the vibration of the drill bit. Therefore, according to the characteristics of the drilling rate and the intensity of vibration, the hardness information of the soil at the drill bit is reflected, and the soil hardness characteristics of the drill bit in the current time period can be obtained.

[0055] Step S3: at least adjusting the rotation speed of the drill bit according to the soil hardness characteristics and the current mud density characteristics of the drill bit in the current time period.

[0056] The current mud density characteristics of the drill bit in the current time period are obtained, wherein the mud density data can be detected by a mud consistency detector.

[0057] In addition to the soil hardness characteristics, the current mud density characteristics of the drill bit in the current time period will also affect the drill bit rotation speed. Therefore, the drill bit rotation speed is adjusted according to the soil hardness characteristics and the current mud density characteristics of the drill bit in the current time period. As another implementation method, in addition to adjusting the drill bit rotation speed, the downward thrust of the drill rod of the rotary drilling rig can also be adjusted to complete the bridge hole forming process.

[0058] As a specific implementation, in step S1, Figure 2 As shown in FIG. 1 , the process of obtaining the vibration severity includes:

[0059] Step S1-1: Obtain the deviation hole angle of the drill bit at each sampling moment in the current time period to obtain a deviation hole angle set.

[0060] In this embodiment, an azimuth meter, an angle sensor, or a gyroscope is provided in the rotary drilling rig to detect the deviation hole angle at each sampling moment of the rotary drilling rig, that is, the deviation hole angle of the drill bit at each sampling moment. Then, the deviation hole angle of the drill bit at each sampling moment in the current time period can be obtained, and the deviation hole angles obtained at multiple sampling moments in the current time period collected constitute the deviation hole angle set of the current time period.

[0061] Step S1-2: Obtain the variance of the offset hole angle set to obtain the vibration severity.

[0062] Since the variance characterizes the fluctuation of data in a series, in this embodiment, the variance of the set of deviation hole angles is calculated, and the obtained variance value is used as the vibration severity. As another embodiment, if the vibration data is data information detected by a vibration sensor, the vibration severity is the variance of the drill bit vibration signal in the current time period.

[0063] In a specific embodiment, Figure 3 As shown, step S2 specifically includes the following steps:

[0064] Step S2-1: Obtaining the average value of the offset hole angles in the offset hole angle set.

[0065] Calculate the average value of the deviation hole angles in the deviation hole angle set in the current time period, and use the average deviation hole angle value as the overall deviation hole angle level of the deviation hole angle set. The larger the average deviation hole angle value, the higher the overall deviation hole angle level, and the more the drilling direction of the drill bit deviates from the correct direction.

[0066] Step S2-2: Obtain the degree of hole deviation according to the average value of the hole deviation angle and the vibration severity, wherein the degree of hole deviation is positively correlated with the average value of the hole deviation angle and the vibration severity.

[0067] Since the larger the average value of the deviation hole angle is, the higher the overall deviation hole angle level is, the more the drilling direction of the drill bit deviates from the correct direction, and correspondingly, the higher the degree of deviation hole is; moreover, the higher the vibration intensity is, the more violent the vibration of the drill bit is, the more likely it is that the deviation hole exists, that is, the higher the degree of deviation hole is. Therefore, according to the average value of the deviation hole angle and the vibration intensity, the degree of deviation hole is obtained, and the degree of deviation hole is positively correlated with the average value of the deviation hole angle and the vibration intensity. As a specific embodiment, a quantification method of the degree of deviation hole is given as follows: calculate the product of the average value of the deviation hole angle and the vibration intensity, and then normalize the product, and the normalized product is the degree of deviation hole. It should be understood that the normalization method in this embodiment can be a maximum and minimum value normalization method, or it can be the following normalization method: , where y is the normalized value and x is the input value. It is an exponential function with the natural constant e as its base.

[0068] Step S2-3: According to the degree of hole deviation and the drilling rate characteristics, the soil hardness characteristics are obtained, and the soil hardness characteristics are positively correlated with the degree of hole deviation and negatively correlated with the drilling rate characteristics.

[0069] The higher the degree of hole deviation, the greater the influence of soil on the drill bit when drilling, that is, the harder the soil is. Therefore, the higher the degree of hole deviation, the higher the probability of encountering hard soil at the drill bit at this time; the harder the soil is, the more it affects the drilling rate. The lower the drilling rate, that is, the smaller the real-time relative penetration rate of the drill bit is, the higher the probability of encountering hard soil at the drill bit at this time. Therefore, the soil hardness characteristic is positively correlated with the degree of hole deviation and negatively correlated with the drilling rate characteristic. Based on the degree of hole deviation and the drilling rate characteristic, the soil hardness characteristic is obtained. As a specific implementation method, a method for quantifying the soil hardness characteristic is given as follows: calculate the negative correlation normalized value of the drilling rate characteristic, and then multiply the negative correlation normalized value of the drilling rate characteristic by the degree of hole deviation, and the product obtained is the soil hardness characteristic. Among them, the negative correlation normalization can be obtained in the following way: .

[0070] In a specific embodiment, Figure 4 As shown, step S3 specifically includes the following steps:

[0071] Step S3-1: According to the soil hardness characteristics and the current mud density characteristics, a rotation speed adjustment coefficient of the drill bit is obtained, and the rotation speed adjustment coefficient is positively correlated with the soil hardness characteristics and the current mud density characteristics.

[0072] It should be understood that the soil hardness characteristics at the current position of the drill bit and the current mud density at the current position of the drill bit affect the drill bit rotation speed. Therefore, the drill bit rotation speed can be adjusted according to these two parameters. For example, when the soil at the drill bit is harder and the mud density is higher, if a low drill bit rotation speed is set at this time, it may cause too much viscous mud to adhere to the hole wall, resulting in hole shrinkage, so a higher drill bit rotation speed should be set at this time; and when the soil at the drill bit is softer and the mud density is lower, if a high drill bit rotation speed is set at this time, it may cause hole collapse, so a lower drill bit rotation speed should be set at this time.

[0073] The harder the soil hardness at the drill bit and the higher the mud density at the drill bit, the higher the drill bit speed is required, and vice versa. Therefore, according to the soil hardness characteristics and the current mud density characteristics, the drill bit speed adjustment coefficient is obtained, and the speed adjustment coefficient is positively correlated with the soil hardness characteristics and the current mud density characteristics. The speed adjustment coefficient is a parameter for adjusting the drill bit speed. The larger the speed adjustment coefficient, the higher the drill bit speed is adjusted, and the smaller the speed adjustment coefficient, the lower the drill bit speed is adjusted. As a specific implementation method, the current mud density detected by the mud consistency detector is normalized to obtain the current mud density characteristics, and the current mud density characteristics are multiplied by the soil hardness characteristics. The product obtained is the drill bit speed adjustment coefficient.

[0074] This embodiment requires the extraction of the mud density at the drill bit. The mud density at the drill bit is the density of the mud at the location of the drill bit. A mud consistency detector can be installed at the drill bit to detect the mud density at the drill bit. However, in the actual construction process, the working conditions at the drill bit are complex, and it may be difficult to install a mud consistency detector at the drill bit. Since the drill bit is connected to the mud pool through a pipeline, the mud in the mud pool is transferred to the drill bit through a pipeline through equipment such as a mud pump. Therefore, the mud density at the current location of the drill bit can be characterized by detecting the density of the mud in the mud pool. Therefore, the mud consistency detector is installed in the mud pool.

[0075] As the drill bit continuously brings more soil to the bottom of the hole during drilling, the deeper the soil layer and the denser the mud in the mud pool, the denser the mud at the drill bit. The required speed at the drill bit is then obtained based on the density of the mud at the drill bit, such as Figure 5 As shown, specifically:

[0076] Step S3-1-1: Obtain the current depth ratio of the drill bit, which is the ratio of the current drilling depth of the drill bit to the target depth of the drill bit. The target depth of the drill bit is the final depth that the drill bit needs to drill. Obtain the current drilling depth of the drill bit, that is, the depth that the drill bit has drilled at the end of the current time period (that is, the current moment), and then obtain the ratio of the current drilling depth of the drill bit to the target depth of the drill bit to obtain the current depth ratio of the drill bit.

[0077] Step S3-1-2: Obtain the original mud density in the mud pool, and take the product of the depth ratio and the original mud density and normalize the result as the current mud density feature. The mud density in the mud pool is taken as the original mud density, and the depth ratio obtained in the above step is multiplied by the original mud density. The product obtained is used to characterize the current mud density, that is, the result after normalization of the product is taken as the current mud density feature. Therefore, the depth ratio can be used as a correction coefficient for the original mud density, and the corrected mud density is used to characterize the current mud density at the current position of the drill bit. It should be understood that the method of multiplying the depth ratio by the original mud density is only used to characterize that the current mud density at the drill bit is proportional to the depth that the drill bit has drilled.

[0078] Step S3-2: adjusting the rotation speed of the drill bit according to the rotation speed adjustment coefficient.

[0079] After obtaining the speed adjustment coefficient, the speed of the drill bit can be adjusted. Specifically: according to the speed adjustment coefficient and the rated speed of the drill bit, the target speed of the drill bit is obtained, wherein the target speed of the drill bit is equal to the product of the speed adjustment coefficient and the rated speed of the drill bit. It should be understood that the rated speed of the drill bit can be understood as the maximum speed that the drill bit can reach. Generally speaking, the actual speed of the drill bit is not higher than the rated speed. Then adjust the speed of the drill bit to the target speed obtained as the speed of the drill bit in the next time period. In each subsequent time period, the corresponding target speed is obtained according to the above process to realize the adaptive adjustment function.

[0080] In a specific embodiment, the above-mentioned bridge drilling method with adaptive adjustment function is executed by the control system of a rotary drilling rig. The control system is connected to the motor signal of the drill bit. After obtaining the target speed, the control system outputs a control instruction to the motor of the drill bit to control the speed of the drill bit to the obtained target speed.

[0081] In a specific embodiment, in addition to adjusting the rotation speed of the drill bit, the thrust of the drill rod of the rotary drilling rig is also adjusted. It should be understood that in the actual drilling process, there is an inverse correlation between the thrust of the drill rod of the rotary drilling rig and the rotation speed of the drill bit, so the thrust of the drill rod is further adjusted according to the real-time rotation speed of the drill bit of the rotary drilling rig, thereby completing the bridge hole forming process.

[0082] like Figure 6 As shown in FIG. 1 , the process of adjusting the thrust of the drill rod of the rotary drilling rig includes:

[0083] Step S3-3: Obtain the drill power intensity characteristic according to the difference between the current real-time rotation speed of the drill bit and the rated rotation speed of the drill bit. As a specific implementation, the ratio of the current real-time rotation speed of the drill bit to the rated rotation speed of the drill bit is used as the drill power intensity characteristic.

[0084] Step S3-4: Based on the drill bit power intensity characteristic, the drill rod thrust adjustment coefficient is obtained; the drill rod thrust adjustment coefficient is inversely correlated with the drill bit power intensity characteristic. It should be understood that the stronger the drill bit power intensity characteristic is, the higher the drill bit rotation speed is, and the lower the power corresponding to the drill rod thrust is, that is, the drill rod thrust needs to be lowered. As a specific implementation, the difference between the value 1 and the drill bit power intensity characteristic is used as the drill rod thrust adjustment coefficient.

[0085] Step S3-5: According to the drill rod thrust adjustment coefficient and the drill rod thrust rated value, the drill rod thrust target value is obtained, and the drill rod thrust of the rotary drilling rig is adjusted to the drill rod thrust target value. Among them, the product of the drill rod thrust adjustment coefficient and the drill rod thrust rated value is used as the drill rod thrust target value. It should be understood that the drill rod thrust rated value is the drill rod thrust rated value, which can be understood as the maximum value of the drill rod thrust. Generally speaking, the actual thrust of the drill rod is not higher than the drill rod thrust rated value. Then the drill rod thrust of the rotary drilling rig is adjusted to the obtained drill rod thrust target value as the thrust of the drill rod in the next time period. In each subsequent time period, the corresponding drill rod thrust target value is obtained according to the above process to realize the adaptive adjustment function.

[0086] The rotary drilling rig then performs construction operations based on the calculated target rotation speed of the drill bit and the target thrust value of the drill rod to achieve bridge drilling.

[0087] This embodiment also provides a bridge drilling system 700 with an adaptive adjustment function, such as Figure 7 As shown, it includes a memory 701 and a processor 702, the memory 701 is used to store an executable program code 703, and the processor 702 is used to call and run the program code 703 from the memory 701 to implement Figure 1 A bridge drilling method with adaptive adjustment function is shown.

[0088] This embodiment also provides a computer-readable storage medium 800, such as Figure 8 As shown, the computer readable storage medium 800 stores a computer program code 801. When the computer program code 801 is executed on a computer, the computer executes Figure 1 A bridge drilling method with adaptive adjustment function is shown.

[0089] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A bridge drilling method with adaptive adjustment function, characterized in that: include: Obtain the drilling rate characteristics of the drill bit in the current time period and the vibration severity of the drill bit in the current time period; Based on the drilling rate characteristics and the vibration intensity, obtaining the soil hardness characteristics of the drill bit in the current time period; According to the soil hardness characteristics and the current mud density characteristics of the drill bit in the current time period, at least the rotation speed of the drill bit is adjusted; The process of obtaining the vibration severity includes: Obtaining the deviation hole angle of the drill bit at each sampling moment in the current time period to obtain a deviation hole angle set; Obtaining the variance of the set of offset hole angles to obtain the intensity of the vibration; Based on the drilling rate characteristics and the vibration intensity, the soil hardness characteristics of the drill bit in the current time period are obtained, including: Obtaining an average value of the offset hole angles in the offset hole angle set; According to the average value of the deviation hole angle and the intensity of the vibration, the deviation hole degree is obtained, and the deviation hole degree is positively correlated with the average value of the deviation hole angle and the intensity of the vibration; The soil hardness characteristic is obtained according to the degree of hole deviation and the drilling rate characteristic. The soil hardness characteristic is positively correlated with the degree of hole deviation and negatively correlated with the drilling rate characteristic.

2. The bridge drilling method with adaptive adjustment function according to claim 1, characterized in that: According to the soil hardness characteristics and the current mud density characteristics of the drill bit in the current time period, at least the rotation speed of the drill bit is adjusted, including: According to the soil hardness characteristics and the current mud density characteristics, a rotation speed adjustment coefficient of the drill bit is obtained, and the rotation speed adjustment coefficient is positively correlated with the soil hardness characteristics and the current mud density characteristics; The rotation speed of the drill bit is adjusted according to the rotation speed adjustment coefficient.

3. The bridge drilling method with adaptive adjustment function according to claim 2 is characterized in that: According to the speed adjustment coefficient, the speed of the drill bit is adjusted, including: The target speed of the drill bit is obtained according to the speed adjustment coefficient and the rated speed of the drill bit, and the speed of the drill bit is adjusted to the target speed.

4. The bridge drilling method with adaptive adjustment function according to claim 2, characterized in that: The process of obtaining the current mud density characteristic includes: Obtaining a current depth ratio of the drill bit, where the depth ratio is a ratio of a current drilling depth of the drill bit to a target depth of the drill bit; The original mud density in the mud pool is obtained, and the product of the depth ratio and the original mud density is normalized and used as the current mud density feature.

5. The bridge drilling method with adaptive adjustment function according to claim 2, characterized in that: The at least adjusting the rotation speed of the drill bit includes: adjusting the rotation speed of the drill bit and the thrust of the drill rod of the rotary drilling rig.

6. The bridge drilling method with adaptive adjustment function according to claim 5, characterized in that: Adjust the thrust of the drill rod of the rotary drilling rig, including: According to the difference between the current real-time rotation speed of the drill bit and the rated rotation speed of the drill bit, the power intensity characteristic of the drill bit is obtained; Based on the drill bit power intensity characteristic, a drill rod thrust adjustment coefficient is obtained; the drill rod thrust adjustment coefficient is inversely correlated with the drill bit power intensity characteristic; According to the drill rod thrust adjustment coefficient and the drill rod thrust rated value, a drill rod thrust target value is obtained, and the drill rod thrust of the rotary drilling rig is adjusted to the drill rod thrust target value.

7. The bridge drilling method with adaptive adjustment function according to claim 6, characterized in that: The drill bit power intensity characteristic is the ratio of the current real-time rotation speed of the drill bit to the rated rotation speed of the drill bit; the drill rod thrust adjustment coefficient is equal to the value 1 minus the drill bit power intensity characteristic.

8. The bridge drilling method with adaptive adjustment function according to claim 1, characterized in that: The drilling rate characteristic is obtained by the drilling depth of the drill bit in the current time period and the time length of the current time period.

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