Pile foundation drilling control method and equipment

Abstract

The present application relates to a pile foundation drilling control method and device. A drill bit is used to drill a pile foundation hole along the axial direction of a steel casing; during the drilling process, the inclination data of the pile foundation hole currently being drilled is obtained. When it is determined that the current inclination of the current pile foundation hole is greater than the designed inclination threshold, a drill bit one level higher than the current drill bit is used to drill to the current hole depth position. The current drill bit is continued to be used to drill along the axial direction of the steel casing, and this cycle is repeated until the current drill bit is used to drill to the designed pile bottom elevation. By obtaining the current inclination, the degree of inclination of the drilling hole can be judged in time, which is convenient for timely correction and ensures the verticality of the drilling hole. Then, a drill bit one level higher than the current drill bit is used to drill to the current hole depth position, and the current drill bit is continued to be used for drilling, so that a stepped hole with a larger top and a smaller bottom can be formed, and the drilling structure is more stable and the hole wall is relatively smooth. Finally, a drill bit consistent with the designed hole diameter is used to drill to the designed pile bottom elevation to complete the pile foundation hole.

Description

Technical Field

[0001] The present application relates to the technical field of drilling construction, and in particular to a pile foundation drilling control method and equipment. Background Art

[0002] At present, rotary drilling rigs are widely used in the construction of hole-forming operations in construction projects. Rotary drilling rigs can be used with different drill bits to perform different drilling operations. For example, in pile foundation construction, the pile foundation is formed by drilling and pouring, and then the pile foundation hole needs to be drilled by a rotary drilling rig. The verticality of the pile foundation hole is a very important quality indicator in pile foundation construction, which directly affects the bearing capacity and structural safety of the pile foundation. However, when encountering complex geological conditions and being affected by geological layers of different depths, the rotary drilling rig will be skewed during the drilling process, which will affect the quality of the pile foundation hole. Therefore, corresponding technical measures need to be taken during the construction process to ensure that the verticality of the pile foundation hole meets the requirements of the specifications.

[0003] In the related art, a sensor is set on the puller of the drill rod of the rotary drilling rig to detect the inclination of the borehole. When the borehole is found to be inclined, a radially retractable drill bit is selected to move to the current drilling position, and the current drilling position is expanded so that the drill bit can be straightened at the current drilling position and start drilling again. However, the borehole structure formed in this way is unstable and is more prone to hole collapse under complex geological conditions. Summary of the invention

[0004] Based on this, it is necessary to provide a pile foundation drilling control method and equipment to improve the verticality of the pile foundation hole and ensure the quality of the pile foundation hole in order to solve the above problems.

[0005] A pile foundation drilling control method, the pile foundation drilling control method comprising:

[0006] S1: Drill positioning holes in the preset construction area and install steel casing in the positioning holes;

[0007] S2: Use a drill bit to drill into the pile foundation hole along the axis of the steel casing;

[0008] S3: Obtain the inclination data of the currently drilled pile foundation hole, and determine whether the current inclination of the current pile foundation hole is greater than the designed inclination threshold;

[0009] S4: If yes, use a drill bit one level higher than the current drill bit to drill to the current hole depth position;

[0010] S5: Continue to use the current drill bit to drill along the axial direction of the steel casing, and execute steps S3 to S4 in a loop until the current drill bit is used to drill to the designed pile bottom elevation;

[0011] S6: using a higher-level drill bit as the current drilling hole to start hole expansion, and looping through steps S3 to S5 until drilling reaches the designed pile bottom elevation or a position close to the designed pile bottom elevation;

[0012] S7: Execute step S6 in a loop until drilling is started using a drill bit that is consistent with the designed pile hole diameter, until drilling reaches the designed pile bottom elevation or a position close to the designed pile bottom elevation.

[0013] In one embodiment, the step S3 comprises:

[0014] Get the tilt angle data θ detected by each detection sensor i ;

[0015] According to the inclination angle data θ i Get the offset distance Δd of the current position of the drill bit relative to the center axis of the designed pile foundation hole, where

[0016]

[0017] Among them, h i is the length of the rotating sleeve where the i-th detection sensor is located, θ i is the inclination angle obtained by the i-th detection sensor, S is the length of the drill bit, θ z The predicted tilt angle for the drill bit;

[0018] It is determined whether the current offset distance Δd of the drill bit is greater than a designed offset threshold.

[0019] In one embodiment, the step of obtaining the tilt angle data θ detected by each detection sensor is as follows: i , and later:

[0020] Determine each tilt angle data θ i The mean square error σ θ Whether it is greater than or equal to the preset variance threshold;

[0021] If so, then

[0022]

[0023] Among them, L i is the distance from the ith detection sensor to the drill bit, L j is the distance from the jth detection sensor to the drill bit, and ω is the adjustment coefficient.

[0024] In one embodiment, the method further comprises:

[0025] If the mean square error σ θ is less than the preset variance threshold, then

[0026] In one embodiment, step S6 comprises:

[0027] A higher-level drill bit is used as the current drilling hole to start hole enlarging, and steps S3 to S5 are executed cyclically until the hole is drilled to a position at a preset height from the current hole bottom;

[0028] Use a slag bucket at the same level as the current drill bit to drill along the current borehole to the current hole bottom position to slag.

[0029] In one embodiment, the method of using a slag scoop at the same level as the current drill bit to drill along the current borehole to the current bottom position to scoop out slag, further includes:

[0030] A higher level lower guide spur roller drill bit is used as the current drilling hole to start hole expansion, and steps S3 to S5 are executed cyclically until the drilling reaches a position at a preset height from the current hole bottom.

[0031] In one embodiment, between two adjacent levels of drill bits, the diameter of the higher level drill bit is 0.2 m-0.8 m larger than the diameter of the lower level drill bit.

[0032] The pile foundation drilling control method is to drill a positioning hole in a preset construction area and install a steel casing in the positioning hole; then use a drill bit to drill the pile foundation hole along the axial direction of the steel casing; in the process of drilling, obtain the inclination data of the pile foundation hole currently being drilled, and when it is judged that the current inclination of the current pile foundation hole is greater than the designed inclination threshold, use a drill bit one level higher than the current drill bit to drill to the current hole depth position. Continue to use the current drill bit to drill along the axial direction of the steel casing, and repeat this cycle until the current drill bit is used to drill to the designed pile bottom elevation; when drilling with the current drill bit, by obtaining the current inclination, it is possible to timely find that the inclination of the drilling hole is greater than the designed inclination threshold, so as to facilitate timely correction and ensure the verticality of the drilling hole. Then, a drill bit one level higher than the current drill bit is used to drill to the current hole depth position, and the current drill bit is continued to drill, so that a stepped hole with a larger top and a smaller bottom can be formed, and the structure of the formed drilling hole is more stable, and the hole wall is relatively smooth, and there will be no situation where the top is small and the bottom is large, which will cause the hole to collapse. Finally, a drill bit consistent with the designed hole diameter is used to drill to the designed pile bottom elevation or a position close to the designed pile bottom elevation to complete the pile foundation hole.

[0033] A pile foundation drilling device, which is used to execute the pile foundation drilling control method as described above, and includes a rotary drilling rig, a drill rod assembly, a drilling bit and a detection sensor, wherein the drill rod assembly can be vertically arranged on the rotary drilling rig; the drilling bit is detachably connected to the bottom of the drill rod assembly, and the rotary drilling rig is used to drive the drill rod assembly to drive the drilling bit to rotate so that the drilling bit can be rotary dug to form a pile foundation hole; the detection sensor is arranged on the drill rod assembly, and the detection sensor is used to detect the inclination of the current borehole.

[0034] In one of the embodiments, the drill rod assembly includes a plurality of rotating sleeve rods, which are sequentially sleeved and can move relative to each other in the axial direction and are relatively fixed in the circumferential direction; at least one detection sensor is provided on each of the rotating sleeve rods, and the detection sensor is used to detect the inclination of the corresponding rotating sleeve rod.

[0035] In one embodiment, the pile foundation drilling equipment also includes a trigger starter, which is arranged on the rotary drilling rig and located near the preset construction area. When the detection sensor passes through the trigger starter and extends into the borehole, the trigger starter triggers the detection sensor to start; when the detection sensor exits the borehole and passes through the trigger starter, the trigger starter triggers the detection sensor to turn off.

[0036] In the pile foundation drilling equipment, the drill rod assembly is vertically arranged on the rotary drilling rig, and the drilling drill bit is connected to the bottom of the drill rod assembly. During construction, the rotary drilling rig is installed in the preset construction area, and the rotary drilling rig drives the drill rod assembly to drive the drilling drill bit to rotate and start drilling. Since the detection sensor is arranged on the drill rod assembly, the detection sensor can detect the inclination of the current borehole. Using multiple detection sensors arranged along the axial direction can provide inclination data of the drill rod assembly at different depths and positions, which helps to more accurately determine the overall inclination of the drill rod assembly, and then more accurately determine the current inclination of the borehole. When it is judged that the current inclination of the current pile foundation hole is greater than the designed inclination threshold, the current drilling drill bit is replaced with a higher-level drill bit to drill to the current hole depth position, and the current drill bit is continued to drill, and this cycle is repeated until the current drill bit is used to drill to the designed pile bottom elevation. Finally, a drill bit consistent with the designed hole diameter is used to drill to the designed pile bottom elevation or a position close to the designed pile bottom elevation to complete the pile foundation hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the various elements are drawn only as examples in the drawings and are not necessarily drawn according to the true scale.

[0040] Figure 1 The figure is a flow chart of a pile foundation drilling control method in one embodiment.

[0041] Figure 2 The figure is a flow chart of a pile foundation drilling control method in another embodiment.

[0042] Figure 3 The figure is a construction process diagram of pile foundation drilling in one embodiment.

[0043] Figure 4 It is a schematic structural diagram of a pile foundation drilling device in one embodiment.

[0044] Figure 5 for Figure 4 A side view of the pile foundation drilling equipment is shown.

[0045] Description of reference numerals:

[0046] Pile foundation drilling equipment 10; rotary drilling rig 100; drill rod assembly 200; rotating sleeve rod 210; drilling drill bit 300; detection sensor 400; trigger starter 500; pile foundation hole 20. DETAILED DESCRIPTION

[0047] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0048] See also Figure 1 , showing a pile foundation drilling control method in an embodiment of the present application, which can at least improve the verticality of the drilling and ensure the quality of the drilling.

[0049] Specifically, the pile foundation drilling control method includes:

[0050] S1: Drill positioning holes in the preset construction area and install steel casing in the positioning holes;

[0051] S2: Use a drill bit to drill into the pile foundation hole along the axis of the steel casing;

[0052] S3: Obtain the inclination data of the currently drilled pile foundation hole, and determine whether the current inclination of the current pile foundation hole is greater than the designed inclination threshold;

[0053] S4: If yes, use a drill bit one level higher than the current drill bit to drill to the current hole depth position;

[0054] S5: Continue to use the current drill bit to drill along the axial direction of the steel casing, and execute steps S3 to S4 in a loop until the current drill bit is used to drill to the designed pile bottom elevation;

[0055] S6: using a higher-level drill bit as the current drilling hole to start hole expansion, and looping through steps S3 to S5 until drilling reaches the designed pile bottom elevation or a position close to the designed pile bottom elevation;

[0056] S7: Execute step S6 in a loop until drilling is started using a drill bit that is consistent with the designed pile hole diameter, until drilling reaches the designed pile bottom elevation or a position close to the designed pile bottom elevation.

[0057] The pile foundation drilling control method is to drill a positioning hole in a preset construction area and install a steel casing in the positioning hole; then use a drill bit to drill the pile foundation hole along the axial direction of the steel casing; in the process of drilling, obtain the inclination data of the pile foundation hole currently being drilled, and when it is judged that the current inclination of the current pile foundation hole is greater than the designed inclination threshold, use a drill bit one level higher than the current drill bit to drill to the current hole depth position. Continue to use the current drill bit to drill along the axial direction of the steel casing, and repeat this cycle until the current drill bit is used to drill to the designed pile bottom elevation; when drilling with the current drill bit, by obtaining the current inclination, it is possible to timely find that the inclination of the drilling hole is greater than the designed inclination threshold, so as to facilitate timely correction and ensure the verticality of the drilling hole. Then, a drill bit one level higher than the current drill bit is used to drill to the current hole depth position, and the current drill bit is continued to drill, so that a stepped hole with a larger top and a smaller bottom can be formed, and the structure of the formed drilling hole is more stable, and the hole wall is relatively smooth, and there will be no situation where the top is small and the bottom is large, which will cause the hole to collapse. Finally, a drill bit consistent with the designed hole diameter is used to drill to the designed pile bottom elevation or a position close to the designed pile bottom elevation to complete the pile foundation hole.

[0058] In one embodiment, step S6 includes:

[0059] A higher-level drill bit is used as the current drilling hole to start hole enlarging, and steps S3 to S5 are executed cyclically until the hole is drilled to a position at a preset height from the current hole bottom;

[0060] Use a slag bucket at the same level as the current drill bit to drill along the current borehole to the current hole bottom position to slag.

[0061] During the hole expansion process, the drill cuttings will settle to the bottom of the hole. Therefore, when the hole is expanded again, the hole expansion is stopped when the hole is drilled to a preset height from the current hole bottom to avoid further expansion, which will not only affect the drilling depth, but also easily affect the stability of the hole bottom structure. Then, the drill cuttings at the bottom of the hole are removed using a slag bucket at the same level as the current drill bit to maintain the quality of the pile foundation hole during drilling.

[0062] In this embodiment, the preset height is 1m-2m from the bottom of the hole, for example, the preset height may be 1.5m from the bottom of the hole. The preset height may also be set according to the current drilling depth and the size enlarged during the hole expansion process. For example, if the current drilling depth is large and the size enlarged during the hole expansion process is large, the preset height may be larger, otherwise it may be smaller.

[0063] In one embodiment, the method of using a slag scoop at the same level as the current drill bit to drill along the current borehole to the current hole bottom position to scoop slag includes:

[0064] A higher level lower guide spur roller drill bit is used as the current drilling hole to start hole expansion, and steps S3 to S5 are executed cyclically until the hole is drilled to a position at a preset height from the current hole bottom;

[0065] In this embodiment, the lower pilot roller drill bit includes a roller drill bit and a guide part. The bottom of the roller drill bit is provided with a guide part, and the diameter of the guide part is consistent with the diameter of the lower-level roller drill. Then, the lower pilot roller drill bit is used as the current drilling hole to start reaming. The guide part located at the bottom can be inserted into the previously drilled hole. The roller drill bit reams the previously drilled hole. The guiding effect of the guide part can reduce the degree of skewness of the roller drill bit during the reaming process.

[0066] In one embodiment, the method of using a slag scoop at the same level as the current drill bit to drill along the current borehole to the current bottom position to scoop slag includes:

[0067] After using a roller drill of the same level as the current borehole to drill to the bottom of the hole at the designed pile bottom elevation, use a slag bucket of the same level as the current drill bit to drill along the current borehole to the current bottom position to slag.

[0068] By drilling to the bottom of the hole at the designed pile bottom elevation through a roller drill, the quality of the formed pile foundation hole can be improved and the pile foundation hole can be ensured to effectively reach the designed pile bottom elevation. The drilling debris at the bottom of the hole can then be fished out using a slag bucket to ensure the quality of the hole bottom.

[0069] In this embodiment, in step S4, drilling to the current hole depth position using a drill bit one level higher than the current drill bit includes:

[0070] A roller drill with a higher level than the current drill bit is used to drill to the current hole depth position. In step S4, it is detected that the current inclination of the current pile foundation hole is greater than the designed inclination threshold, and thus a roller drill with a higher level is needed to correct the current hole rotation. In this step, the lower guide roller drill bit is not used, and the guide part of the lower guide roller drill bit will limit the direction of the lower guide roller drill bit, which is not conducive to modifying the current drilling hole. The use of a roller drill will not be limited by the guide part. The travel direction is convenient for correcting the current drilling hole.

[0071] In one embodiment, after step S7, the following steps are further included:

[0072] Use a hole sweeping drill bit to clean the wall of the steel casing along the axial direction of the steel casing, and then use a slag bucket to clean the drilling slag at the bottom of the hole. By cleaning the wall of the steel casing, it is convenient to use the steel casing for positioning support in subsequent construction.

[0073] In the above embodiment, between two adjacent drill bits, the diameter of the higher-level drill bit is 0.2m-0.8m larger than the diameter of the lower-level drill bit. For example, the diameter of the higher-level drill bit is 0.5m larger than the diameter of the lower-level drill bit. By controlling the diameter difference between two adjacent drill bits, the diameter of each hole expansion can be controlled, avoiding the increase in drilling difficulty due to the size of a single hole expansion, increasing the risk of tilting during the drilling process; and avoiding the increase in the number of hole expansions due to the small size of a single hole expansion, which affects the construction progress.

[0074] See also Figure 2 In one embodiment, the step S3: obtaining the inclination data of the currently drilled pile foundation hole, and determining whether the current inclination of the current pile foundation hole is greater than the designed inclination threshold, comprises:

[0075] Get the tilt angle data θ detected by each detection sensor i ;

[0076] According to the inclination angle data θ i Get the offset distance Δd of the current position of the drill bit relative to the center axis of the designed pile foundation hole, where

[0077]

[0078] Among them, h i is the length of the rotating sleeve where the i-th detection sensor is located, θ i is the inclination angle obtained by the i-th detection sensor, S is the length of the drill bit, θ z The predicted tilt angle for the drill bit;

[0079] It is determined whether the current offset distance Δd of the drill bit is greater than a designed offset threshold.

[0080] In this embodiment, the drill rod assembly of the pile foundation drilling equipment includes a plurality of rotating sleeve rods, which are sleeved in sequence and can move relative to each other in the axial direction and are relatively fixed in the circumferential direction; each rotating sleeve rod is provided with at least one detection sensor, which is used to detect the inclination of the corresponding rotating sleeve rod. By obtaining the inclination angle data θ of the detection sensors on the plurality of rotating sleeve rods i , determine the current offset distance Δd between the center of the drill bit and the center of the designed pile foundation hole. When the offset distance Δd is greater than the designed offset threshold, it proves that continuing to drill along the current inclination will cause the inclination of the pile foundation hole to be greater than the designed inclination threshold.

[0081] For example, in one embodiment, a 1.5m drill bit is currently used for drilling, the designed pile bottom elevation H is 10m, and the allowable inclination θ is 3 degrees, then the maximum value of the designed offset threshold should be H sinθ=10*sin3=0.52m. Then the designed inclination threshold can be the maximum offset value, that is, H sinθ. In other embodiments, the designed inclination threshold can be a function that changes with the current drilling depth, for example, it can be H t sinθ, where H t is the current drilling depth. Determine whether Δd is greater than H at the current drilling depth. t sinθ.

[0082] In one embodiment, the tilt angle data θ detected by each detection sensor is obtained. i , and later:

[0083] Determine each tilt angle data θ i The mean square error σ θ Is it greater than or equal to the preset variance threshold?

[0084]

[0085] in, is the data of each tilt angle θ i The mean of

[0086] If so, then

[0087]

[0088] Among them, L i is the distance from the ith detection sensor to the drill bit, L j is the distance from the jth detection sensor to the drill bit, and ω is the adjustment coefficient.

[0089] By judging each tilt angle data θ i The mean square error σθ , can determine the various inclination angle data θ i A measure of the degree of variation relative to the mean. θ The larger the value, the greater the variability of the data; the mean square error σ θ The smaller the value, the more concentrated the data is. Therefore, when the data distribution is highly discrete, the inclination angle θ of the drill bit can be predicted by the above formula. z , improve the accuracy of prediction.

[0090] In another embodiment, the pile foundation drilling control method further includes:

[0091] If the mean square error σ θ is less than the preset variance threshold, then

[0092] When the data distribution is less discrete, we can get the data of each tilt angle θ i The average value of the drill bit inclination angle θ is obtained z .

[0093] See also Figure 1 and Figure 3 In one embodiment, the above method is applied in areas with abundant river channels, and the geological conditions of the preset construction area where the pile foundation hole is located are complex. For example, the soft soil layer in the upper part of the geology is thick and easy to shrink, and the silty clay, gravel sand and medium-coarse sand are very easy to collapse. The middle and lower parts are slightly weathered rock layers, such as inclined rocks. Therefore, in the process of drilling pile foundation holes, on the one hand, the hole collapse phenomenon is likely to occur during the drilling process, and due to the different components of the geological layers at different depths, the tilt phenomenon is likely to occur. Therefore, in this embodiment, a specific pile foundation drilling control method is provided, and the pile diameter is designed to be 3.0m as an example for explanation. The pile foundation drilling control method includes:

[0094] (1) Drill a positioning hole in the preset construction area and install a steel casing in the positioning hole; the diameter of the positioning hole is larger than the designed pile diameter. For example, in this embodiment, the inner diameter of the steel casing can be 3.3 m.

[0095] (2) Use a drill bit with the same diameter as the designed pile to drill until the rock layer is reached. For example, a 3m diameter slag bucket is used for drilling. Since soft soil layers are easy to drill, the drilling difficulty is low, and the borehole is not prone to skewness, thus avoiding multiple stage drillings that affect the drilling progress. In other embodiments, this step can also be omitted.

[0096] (3) Use an upper guide drill bit to drill vertically into the rock formation and keep the borehole centered. The upper guide drill bit includes a rock drill bit and an upper guide portion located on the top of the rock drill bit, and the diameter of the upper guide portion is consistent with the designed pile diameter. Since a borehole consistent with the designed pile diameter has been formed in step (2), the upper guide portion can be used to provide guidance for the rock drill bit to drill into the rock formation, thereby ensuring the verticality of the borehole. For example, in this embodiment, the diameter of the upper guide portion is 3m, and the diameter of the rock drill bit is 1.5m. In other embodiments, this step can also be omitted.

[0097] (4) Use a coring drill bit to drill along the axial direction of the steel casing, and obtain the inclination data of the pile foundation hole currently being drilled during the drilling process. If it is judged that the current inclination of the current pile foundation hole is greater than the designed inclination threshold, it proves that

[0098] In this embodiment, a 1.5m roller drill is used for drilling. When it is determined that the current inclination of the current pile foundation hole is greater than the designed inclination threshold, a 2m roller drill is replaced and drilled to the current hole depth position, and then a 1.5m roller drill is replaced to continue drilling until the designed pile bottom elevation is reached.

[0099] (5) Use a higher-level drill bit as the current hole to start reaming, and repeat step (4) to determine the verticality of the current hole diameter. In this embodiment, a 2m diameter drill bit with a 1.5m guide portion at the bottom is used to start reaming. When the drill reaches 1.5m from the bottom of the hole, a 2m diameter roller drill is used to cut to the bottom of the hole, and then a 2m diameter slag bucket is used to complete the slag removal at the bottom of the hole.

[0100] (6) Repeat step (5), for example, use a 2.5m diameter drill bit and a 2m guide portion at the bottom to start reaming, and when drilling to 1.5m from the bottom of the hole, use a 2.5m diameter roller drill to cut to the bottom of the hole, and then use a 2.5m diameter slag bucket to complete the slag removal at the bottom of the hole. Then use a 3m diameter drill bit and a 2.5m guide portion at the bottom to start reaming, and when drilling to 1.5m from the bottom of the hole, use a 3m diameter roller drill to cut to the bottom of the hole, and then use a 3m diameter slag bucket to complete the slag removal at the bottom of the hole.

[0101] (7) Use a 3.3m diameter hole-sweeping drill bit to clean the inner wall of the steel casing, and finally use a 3m diameter slag bucket to clean the drilling slag at the bottom of the hole to complete the drilling of the pile foundation hole.

[0102] In this embodiment, in the above-mentioned drilling step, it is necessary to timely add mud into the borehole so that the mud surface in the borehole is always more than 1.5 above the groundwater level to ensure the stability of the hole wall and prevent hole collapse.

[0103] In this embodiment, when the rotary drilling rig drills to a position about 1m to 2m close to the bottom of the steel casing, it must adopt low drilling pressure and low rotation speed drilling, and control the penetration to ensure the stability of the stratum at the bottom of the steel casing; when the drill bit drills 4m to 5m out of the bottom of the steel casing, it resumes normal drilling.

[0104] Drilling construction is one of the most important links in bored pile construction. The diameter, verticality and quality of the drilled hole are directly related to the quality of the pile. Therefore, during the drilling process, the geological conditions of each layer must be checked and understood in detail according to the geological survey data. The diameter and verticality of the drilled hole must be strictly controlled, and the mud index must be strictly controlled to ensure the quality of the drilled hole. The above pile foundation drilling control method can effectively improve the quality of the pile foundation hole and ensure the reliability and stability of the subsequent cast-in-place pile construction.

[0105] It should be understood that although Figure 1-2 The steps in the flowchart are shown in sequence according to the arrows, but these steps are not necessarily performed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be performed in other orders.

[0106] See also Figure 4 and Figure 3 In one embodiment, the present application further discloses a pile foundation drilling device 10, which is used to execute the pile foundation drilling control method in any one of the embodiments described above, and can at least improve the verticality of the pile foundation hole 20 and ensure the quality of the pile foundation hole 20.

[0107] Specifically, the pile foundation drilling equipment 10 includes a rotary drilling rig 100, a drill rod assembly 200, a drilling bit 300 and a detection sensor 400; the drill rod assembly 200 can be vertically arranged on the rotary drilling rig 100; the drilling bit 300 is detachably connected to the bottom of the drill rod assembly 200, and the rotary drilling rig 100 is used to drive the drill rod assembly 200 to drive the drilling bit 300 to rotate, so that the drilling bit 300 can be rotary dug to form a pile foundation hole 20; the detection sensor 400 is arranged on the drill rod assembly 200, and the detection sensor 400 is used to detect the inclination of the current borehole.

[0108] In the pile foundation drilling equipment 10, the drill rod assembly 200 is vertically arranged on the rotary drilling rig 100, and the drilling bit 300 is connected to the bottom of the drill rod assembly 200. During construction, the rotary drilling rig 100 is installed in a preset construction area, and the rotary drilling rig 100 drives the drill rod assembly 200 to drive the drilling bit 300 to rotate and start drilling. Since the detection sensor 400 is arranged on the drill rod assembly 200, the detection sensor 400 can detect the inclination of the current borehole. Using multiple detection sensors 400 arranged along the axial direction can provide the inclination data of the drill rod assembly 200 at different depths and positions, which helps to more accurately determine the overall inclination of the drill rod assembly 200, and then more accurately determine the current inclination of the borehole. When it is determined that the current inclination of the current pile foundation hole 20 is greater than the designed inclination threshold, the current drilling bit 300 is replaced with a higher-level drilling bit 300 to drill to the current hole depth position, and then the current drilling bit is continued to be used for drilling, and this cycle is repeated until the current drilling bit 300 is used to drill to the designed pile bottom elevation. Finally, the drilling bit 300 consistent with the designed hole diameter is used to drill to the designed pile bottom elevation or a position close to the designed pile bottom elevation to complete the pile foundation hole 20.

[0109] In one embodiment, the detection sensor 400 includes an inclination measurement sensor, which is used to measure the angle between two orthogonal radial axes of the drill rod assembly 200 and the horizontal plane. In another embodiment, the detection sensor 400 also includes an azimuth measurement sensor; the azimuth measurement sensor is used to measure the angle value of the drill rod assembly 200 rotating around its gravity axis. In other embodiments, the detection sensor 400 may also include other types of sensors, as long as the detection of the inclination angle of the drill rod can be achieved.

[0110] In this embodiment, the drill rod assembly 200 includes a plurality of rotating sleeve rods 210, which are sleeved in sequence, and the plurality of rotating sleeve rods 210 can be relatively moved in the axial direction and relatively fixed in the circumferential direction; each rotating sleeve rod 210 is provided with at least one detection sensor 400, and the detection sensor 400 is used to detect the inclination of the corresponding rotating sleeve rod 210. The plurality of rotating sleeve rods 210 can drive the drilling bit 300 to move to different depths and realize drilling of different depths by moving along the axial direction. At the same time, at least one detection sensor 400 is provided on each rotating sleeve rod 210, and the detection sensor 400 is used to detect the inclination of the corresponding rotating sleeve rod 210, so as to facilitate the comprehensive evaluation of the overall inclination of the drill rod assembly 200, so as to determine whether the current position of the drilling bit 300 is greater than the designed inclination threshold.

[0111] In other embodiments, the drill rod assembly 200 may further include a plurality of spliced ​​rods, wherein a spliced ​​rod of an upper section is butt-jointed to a spliced ​​rod of a lower section, and at least one detection sensor 400 is disposed on each spliced ​​rod.

[0112] In one embodiment, the pile foundation drilling equipment 10 further includes a trigger starter 500, which is arranged on the rotary drilling rig 100 and is located near the preset construction area. When the detection sensor 400 passes through the trigger starter 500 and extends into the borehole, the trigger starter 500 triggers the detection sensor 400 to start, and when the detected sensor 400 exits the borehole and passes through the trigger starter 500, the trigger starter 500 triggers the detection sensor 400 to turn off. By setting the trigger starter 500, it is possible to trigger the detection sensor 400 to start or turn off according to the position of the detection sensor 400. On the one hand, it is convenient to obtain the position of the drill bit through the triggered or turned off detection sensor 400, and then the inclination of the borehole at the current position of the drill bit can be determined; on the other hand, the accuracy of data processing is improved, and data redundancy is avoided to increase the processing workload.

[0113] In one embodiment, the trigger starter 500 includes an electromagnet, and the detection sensor 400 includes a magnetic induction sensor and a tilt measurement sensor, and the magnetic induction sensor serves as a start / shutdown control of the tilt measurement sensor. When the magnetic induction sensor detects the magnetic field generated by the electromagnet, it will trigger the control of the tilt measurement sensor to turn on the power. If the magnetic induction sensor approaches the electromagnet again, the detection of the magnetic field will trigger the logic circuit to switch the state, thereby triggering the inclination measurement sensor to be turned off. In this way, it can be achieved that when the detection sensor 400 extends into the borehole and passes through the trigger starter 500, it is started, and when it exits the borehole, it is turned off, thereby realizing automatic control of the start and shut down of the detection sensor 400.

[0114] In one embodiment, the pile foundation drilling equipment 10 further includes a control device, which may be a terminal or a control display device provided on a rotary drilling rig. The control device is used to obtain and analyze the inclination data obtained by each detection sensor 400. The control device can determine whether the current inclination of the pile foundation hole 20 is greater than the designed inclination threshold value based on each inclination data, and give a prompt whether hole expansion is required. In another embodiment, the control device can also control the drilling speed, drilling depth, etc. of the drill rod assembly 200 driven by the rotary drilling rig 100.

[0115] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0116] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0117] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0118] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0119] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0120] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0121] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A pile foundation drilling control method, characterized in that: The pile foundation drilling control method comprises: S1: Drill positioning holes in the preset construction area and install steel casing in the positioning holes; S2: Use a drill bit to drill into the pile foundation hole along the axis of the steel casing; S3: The drill rod assembly of the pile foundation drilling equipment includes a plurality of rotating sleeve rods, which are sleeved in sequence and can move relative to each other in the axial direction and are relatively fixed in the circumferential direction; each of the rotating sleeve rods is provided with at least one detection sensor, which is used to detect the inclination of the corresponding rotating sleeve rod; and the inclination angle data θ detected by each detection sensor is obtained. i , according to the tilt angle data θ i Get the offset distance Δd of the current position of the drill bit relative to the center axis of the designed pile foundation hole, where h i is the length of the rotating sleeve where the i-th detection sensor is located, θ i is the inclination angle obtained by the i-th detection sensor, S is the length of the drill bit, θ z The predicted tilt angle for the drill bit; Determining whether the current offset distance Δd of the drill bit is greater than a designed offset threshold; S4: If yes, use a cone drill bit that is one level higher than the current drill bit to drill to the current hole depth position; S5: Continue to use the current drill bit to drill along the axial direction of the steel casing, and execute steps S3 to S4 in a loop until the current drill bit is used to drill to the designed pile bottom elevation; S6: using a lower guide spur roller drill bit of a higher level as the current drill bit to start hole enlarging, and looping through steps S3 to S5 until drilling reaches the designed pile bottom elevation or a position close to the designed pile bottom elevation; S7: Execute step S6 in a loop until drilling is started using a drill bit that is consistent with the designed pile hole diameter, until drilling reaches the designed pile bottom elevation or a position close to the designed pile bottom elevation.

2. The pile foundation drilling control method according to claim 1, characterized in that: The acquisition of the tilt angle data θ detected by each detection sensor i , and later: Determine each tilt angle data θ i The mean square error σ θ Whether it is greater than or equal to the preset variance threshold; If so, then Among them, L i is the distance from the ith detection sensor to the drill bit, L j is the distance from the jth detection sensor to the drill bit, and ω is the adjustment coefficient.

3. The pile foundation drilling control method according to claim 2, characterized in that: The method further comprises: If the mean square error σ θ is less than the preset variance threshold, then 4. The pile foundation drilling control method according to any one of claims 1 to 3, characterized in that: The step S6 comprises: A higher-level drill bit is used as the current drilling hole to start hole enlarging, and steps S3 to S5 are executed cyclically until the hole is drilled to a position at a preset height from the current hole bottom; Use a slag bucket at the same level as the current drill bit to drill along the current borehole to the current hole bottom position to slag.

5. The pile foundation drilling control method according to any one of claims 1 to 3, characterized in that: The method of using a slag scoop at the same level as the current drill bit to drill along the current borehole to the current hole bottom position to scoop slag includes: A higher level lower guide spur roller drill bit is used as the current drilling hole to start hole expansion, and steps S3 to S5 are executed cyclically until the drilling reaches a position at a preset height from the current hole bottom.

6. The pile foundation drilling control method according to any one of claims 1 to 3, characterized in that: After step S7, the method further includes: Use a sweeping drill bit to clean the wall of the steel casing along the axial direction of the steel casing, and then use a slag bucket to clean the drilling slag at the bottom of the hole.

7. The pile foundation drilling control method according to any one of claims 1 to 3, characterized in that: Between two adjacent levels of drill bits, the diameter of the higher level drill bit is 0.2m-0.8m larger than the diameter of the lower level drill bit.

8. A pile foundation drilling device, characterized in that: The pile foundation drilling equipment is used to execute the pile foundation drilling control method according to any one of claims 1 to 7, and the pile foundation drilling equipment comprises: Rotary drilling rig; A drill rod assembly, the drill rod assembly can be vertically arranged on the rotary drilling rig; the drill rod assembly comprises a plurality of rotating sleeve rods, the plurality of rotating sleeve rods are sleeved in sequence, and the plurality of rotating sleeve rods can be relatively moved in the axial direction and relatively fixed in the circumferential direction; A drilling bit, wherein the drilling bit is detachably connected to the bottom of the drill rod assembly, and the rotary drilling rig is used to drive the drill rod assembly to drive the drilling bit to rotate, so that the drilling bit can be rotated to form a pile foundation hole; and A detection sensor: each of the rotating sleeve rods is provided with at least one detection sensor, and the detection sensor is used to detect the inclination of the corresponding rotating sleeve rod.

9. The pile foundation drilling equipment according to claim 8, characterized in that: The pile foundation drilling equipment also includes a trigger starter, which is arranged on the rotary drilling rig and located near the preset construction area. When the detection sensor passes through the trigger starter and extends into the borehole, the trigger starter triggers the detection sensor to start; when the detection sensor exits the borehole and passes through the trigger starter, the trigger starter triggers the detection sensor to shut down.

10. The pile foundation drilling equipment according to claim 9, characterized in that: The trigger starter includes an electromagnet, and the detection sensor includes a magnetic induction sensor and an inclination measurement sensor. The magnetic induction sensor is used to control the start or shut down of the inclination measurement sensor; when the magnetic induction sensor detects the magnetic field generated by the electromagnet, it triggers the control of the inclination measurement sensor to turn on the power; when the magnetic induction sensor detects the electromagnet again, it triggers the shut down of the inclination measurement sensor.

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