A device and method for detecting the quality of rotary drilling pile holes and cleaning sediment.

Abstract

This invention belongs to the field of rotary drilling technology and discloses a device and method for detecting the quality of rotary drilling pile holes and cleaning sediment. It addresses the problems of reduced single-pile bearing capacity caused by manual inspection of pile hole quality and the inability of slag pumps to effectively remove fine sediment obstructed by boulders. The invention features a mobile platform mounted on its main body, equipped with a working unit. The main body platform has a through-hole for easy operation, and at least a portion of the working unit can pass through the through-hole and extend into the pile hole to detect the pile hole quality and clean sediment. This invention integrates hole quality detection, sediment thickness measurement at the bottom of the hole, and cleaning into a single unit, achieving automated and precise control of rotary drilling pile construction quality.

Description

Technical Field

[0001] This invention belongs to the field of rotary drilling technology, specifically relating to a device and method for detecting the quality of rotary drilling pile holes and cleaning sediment. Background Technology

[0002] Rotary drilling piles are a commonly used pile type for municipal building pile foundations in my country. They are characterized by a high degree of mechanization, fast drilling speed, and easy control over hole quality. Rotary drilling technology is widely applicable to pile foundation construction in silt, cohesive soil, sand, gravelly soil, and weathered rock strata. The main construction process is as follows: pile hole positioning – casing installation – drilling – mud wall protection – hole cleaning – hoisting and lowering of the reinforcing cage – concrete pouring – casing removal – backfilling of the pile hole.

[0003] The quality of rotary drilling directly affects the subsequent lowering of the reinforcing cage and concrete pouring, while the thickness of the sediment at the bottom of the hole also significantly impacts the bearing capacity of a single pile. Therefore, in addition to the drilling process itself, it is essential to conduct periodic drilling quality checks after completion and before concrete pouring. These checks primarily include: hole shape, diameter, depth, and sediment detection at the bottom of the hole. If the sediment is excessively thick, a secondary cleaning of the hole is necessary.

[0004] The "Technical Specification for Building Pile Foundations" (JGJ 94-2008) clearly stipulates that the quality of rotary drilling pile hole formation should meet the following requirements:

[0005] 1) The pile diameter shall not be less than the design value, and the deviation shall not exceed 50mm;

[0006] 2) For small-diameter piles, the pile position deviation shall not exceed d / 6 and shall not exceed 100mm; for large-diameter piles, the deviation shall not exceed 100mm+0.01H.

[0007] 3) The thickness of sediment should not exceed 50mm for end-bearing piles, 150mm for friction piles, and 200mm for piles resisting pull-out and horizontal forces.

[0008] Currently, the main methods for controlling the quality of borehole formation include: before lowering the reinforcing cage, using a cage-type borehole caliper (or borehole caliper) made of smooth round steel bars for borehole inspection; during inspection, the caliper is hoisted, with the center of the borehole aligned with the hoisting steel rope, and slowly lowered into the borehole; unobstructed movement up and down indicates that the borehole diameter is larger than the given cage diameter. There are also many existing technical documents regarding borehole calipers (caliper instruments) for pile testing, such as a single-arm eccentric borehole caliper disclosed in application number 2022201541480, a borehole caliper probe and caliper disclosed in application number 2021220861615, and a D4CG four-wall independent hydraulic borehole caliper disclosed in application number 2013203929148. Although the structural forms of borehole calipers vary, their basic principle remains unchanged: using an angle-adjustable measuring arm and installing sensors (such as potentiometers) at the end of the measuring arm to detect the quality of the pile hole.

[0009] The depth of the borehole and the sediment at the bottom of the borehole are tested using a standard hammer. The hammer is generally a conical hammer with a bottom diameter of 13cm-15cm, a height of 20-22cm, and a weight of 4-6kg.

[0010] In summary, the current method of detecting the quality of rotary drilling pile holes and the thickness of sediment mainly relies on manual labor and tools. In reality, this detection method is subject to significant and unavoidable human and systematic errors.

[0011] Furthermore, the cleaning of sediment from rotary drilling piles includes primary cleaning and secondary cleaning. Primary cleaning utilizes the reverse rotation of the drill bit to agitate and discharge sediment through reverse circulation. Secondary cleaning involves removing the drill bit and drill rod and then using a sediment pump to complete the secondary cleaning. For example, a sediment cleaning device for drilling disclosed in application number 2020223247211 includes a sediment storage tank, a fixed base, a mounting base, and a water pump. The sediment storage tank is fixedly connected to the fixed base via multiple first connecting blocks. The water pump is installed below the fixed base, and the mounting base is fixed to the upper end of the fixed base. A power supply is installed inside the fixed base and electrically connected to the water pump. The lower end of the sediment storage tank has evenly distributed through holes. One side of the water pump is connected to an inlet pipe fixed to the inner wall of the sediment storage tank, and the lower end of the water pump is connected to an outlet pipe. A pull ring is threaded into the middle of the mounting base, and a sediment transport device is also provided inside the sediment storage tank. This technology uses a water pump to circulate water at the bottom of the borehole, suspending the sediment at the bottom of the borehole, which then falls into a sediment storage tank and is transported to the outside of the borehole by a sediment transport device.

[0012] For example, application number 2015100773911 discloses a rotary drilling pile hole cleaning device and its construction method. The cleaning device includes a cylindrical cleaning device steel casing with a water filter hole, a slag pump, a filter screen, a central slag discharge hole, a first slag outlet, a second slag outlet, a compressed gas pipeline, a foaming agent pipeline, a sediment collection chamber, a steel plate, a spring, a rubber sheet, fastening bolts, rotating bolts, a compressed gas outlet, a foaming agent outlet, a gas distributor, a positioning device, a filter screen fastening bolt, a circular insert rod, a filter screen rotating bolt, a steel cable, a guide wheel, and a fixed shaft. The construction steps are: ① Place the rotary drilling pile hole cleaning device at the end of the rotary drilling rod; ② Insert the rotary drilling pile hole cleaning device into the bottom of the pile hole and slowly rotate it several times before fixing it; ③ Input compressed gas into the compressed gas pipeline and simultaneously input foaming agent; ④ Start the slag pump to remove slag; ⑤ After several cycles, the slag removal is completed, and the cleaning device is pulled out to unload the slag.

[0013] For example, application number 2014104251583 discloses an air-lift hole-cleaning device and its method for pre-grouting of bored piles. The device modifies the existing grouting pipe by adding a ring-shaped self-stabilizing hole cleaner or a spiral self-stabilizing hole cleaner, a first tee connector, a check valve, a second tee connector, and an air compressor. This allows the grouting pipe to be used not only for grouting but also for hole cleaning. The cleaning method involves introducing compressed air into the grouting pipe after secondary hole cleaning of the bored pile and before concrete pouring. The compressed air is then ejected from the bottom of the hole through the ring-shaped or spiral self-stabilizing hole cleaner, forming a three-phase flow with the mud and sediment. Under air-lift action, the three-phase flow rises along the pile hole, causing residual sediment at the bottom to float to a stable height. The air compressor is turned off before the first bucket of concrete enters the guide pipe and is discharged from the bottom of the guide pipe. This technology combines the grouting pipe system with the secondary hole-cleaning process, ensuring that there is virtually no sediment at the bottom of the pile hole during concrete pouring.

[0014] The existing cleaning devices mentioned above mostly use water or air pressure to suspend the sediment, and then use a sludge pump to suck it up, thereby completing the cleaning of the sediment.

[0015] However, in the actual process of handling sediment, boulders often appear at the bottom of the pile hole. Although the boulders themselves do not affect the hardness of the bottom of the pile hole, they can block the movement of some fine sediment, making it impossible to remove the fine sediment, which in turn leads to a reduction in the bearing capacity of the single pile. Summary of the Invention

[0016] This invention addresses the problem of reduced single-pile bearing capacity caused by the ineffective removal of fine sediment obstructed by boulders when manually inspecting pile hole quality and by using slag pumps. It provides a device and method for inspecting the quality of rotary drilling pile holes and cleaning sediment, integrating hole quality inspection, sediment thickness measurement at the bottom of the hole, and cleaning into a single unit, achieving automated and precise control of rotary drilling pile construction quality. Simultaneously, it significantly reduces manual labor, offering clear advantages over manual hole cleaning.

[0017] To solve the technical problem, the technical solution adopted by this invention is as follows:

[0018] A rotary drilling pile hole quality inspection and sediment cleaning device includes a machine platform, characterized in that a mobile platform is installed on the machine platform, the mobile platform is movable on the machine platform, the mobile platform is equipped with a working unit for hole quality inspection and sediment cleaning, the machine platform has a through hole for easy operation, at least a part of the structure of the working unit can pass through the through hole and extend into the pile hole to inspect the pile hole quality and clean the sediment.

[0019] In some embodiments, the working unit includes a working box mounted on a mobile platform, the working box being movable on the mobile platform, a servo motor installed inside the working box, a drive gear disposed on the output shaft of the servo motor, a mounting plate also installed inside the working box, a ball bearing mounted in the middle of the mounting plate, a driven gear meshing with the drive gear mounted on the inner ring of the ball bearing, the driven gear and the ball bearing being connected to each other via a bushing, the inner wall of the bushing being threaded, and a lowering mechanism for extending into the pile hole being threadedly connected to the bushing.

[0020] In some embodiments, the lowering mechanism includes a connecting mechanism and a working head. The connecting mechanism includes an outer tube, and a plurality of mounting bearings are installed at intervals around the outer periphery of the outer tube. At least three slots are provided on the outer wall of the mounting bearings. A connecting plate with an arc-shaped outer end face is held in the slots. The arc-shaped surface is provided with threads that mate with the threads of the bushing. A suction pipe and a pressure pipe are installed inside the outer tube.

[0021] In some embodiments, the working head includes a housing, a mounting bearing is installed at the center of the top of the housing, a cavity is formed inside the housing, a suction pipe and a pressure pipe inside the outer sleeve extend into the cavity of the housing, the bottom of the housing has a first end cover and a second end cover, the distance between the second end cover and the top of the housing is greater than the distance between the first end cover and the top of the housing, a suction port communicating with the cavity of the housing is formed between the first end cover and the second end cover; a scanner is installed on the circumferential wall of the housing, and a pressure sensor is installed on the bottom surface of the second end cover.

[0022] In some embodiments, a torque sensor for monitoring the torque of the connecting mechanism is mounted on the top of the work box.

[0023] In some embodiments, the edge of the second end cover is provided with a plurality of cutting teeth.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The rotary drilling pile hole quality inspection and sediment cleaning device and method of the present invention integrate hole quality inspection, hole bottom sediment thickness measurement and cleaning into one, realizing automated and precise control of rotary drilling pile construction quality, improving the efficiency of pile hole quality and sediment inspection and cleaning, and improving the accuracy of inspection compared with the prior art.

[0026] Meanwhile, when cleaning sediment, this invention can agitate the boulders, thereby avoiding the problem of sediment not being cleaned properly due to obstruction by the boulders, ensuring that the sediment at the bottom of the pile hole can be thoroughly cleared, and thus ensuring that the bearing capacity of a single pile is not affected by sediment. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a structure according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram showing the connection between the connecting mechanism and the working box of the present invention;

[0029] Figure 3 for Figure 2 A magnified view of a portion of point A in the diagram;

[0030] Figure 4 This is a top view schematic diagram of the connection plate and the mounting bearing in this invention;

[0031] Figure 5 A schematic diagram of the working head of the invention;

[0032] The diagram shows the following components: 1. Torque sensor, 2. Display screen, 3. Work box, 4. Moving platform, 5. Toolbox, 6. Machine platform, 7. Power equipment, 8. Scanner, 9. Working head, 91. Housing, 92. Cavity, 93. First end cover plate, 94. Second end cover plate, 10. Connecting mechanism, 101. Connecting plate, 102. Mounting bearing, 103. Outer sleeve, 104. Suction pipe, 105. Pressure pipe, 11. Walking mechanism, 12. Guide rail, 13. Rotating shaft, 14. Slag box, 15. Servo motor, 16. Reducer, 17. Mounting plate, 18. Drive gear, 19. Driven gear, 20. Ball bearing, 21. Bushing, 22. Pressure sensor. Detailed Implementation

[0033] The present invention will be further described below with reference to embodiments. These embodiments are merely some, not all, of the embodiments of the present invention. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the protection scope of the present invention.

[0034] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] Combined with appendix Figure 1 To be continued Figure 5 The rotary drilling pile hole quality inspection and sediment cleaning device of the present invention includes a body platform 6. A traveling mechanism 11 is disposed below the body platform 6 (the traveling mechanism 11 can be a wheeled or tracked traveling mechanism; both wheeled and tracked types are clear to those skilled in the art and will not be described in detail here). A power device 7 (e.g., a diesel engine, gasoline engine, or electric motor, etc.) for driving the traveling mechanism 11 is disposed above the body platform 6. A mobile platform 4 is mounted on the body platform 6, and the mobile platform 4 is equipped with a working unit for hole quality inspection and sediment cleaning. A through hole is provided on the body platform 6 for easy operation. At least a portion of the working unit can pass through the through hole and extend into the pile hole to inspect the pile hole quality and clean the sediment. That is to say, the through hole facilitates the passage of the lowering mechanism and also facilitates observation of the pile hole through the through hole.

[0036] In the actual real-time process, a guide rail 12 is provided on the body platform 6, and the mobile platform is mounted on the guide rail. A drive mechanism for driving the mobile platform 4 to move on the guide rail 12 is installed on the body platform. The drive mechanism for driving the linear motion of the mobile platform 4 is prior art, which can be understood by those skilled in the art, and will not be described in detail here.

[0037] The rotary drilling pile hole quality inspection and sediment cleaning device and method of the present invention integrate hole quality inspection, hole bottom sediment thickness measurement and cleaning into one, realizing automated and precise control of rotary drilling pile construction quality, improving the efficiency of pile hole quality and sediment inspection and cleaning, and improving the accuracy of inspection compared with the prior art.

[0038] In some embodiments, the working unit includes a working box 3 mounted on a mobile platform 4. A servo motor 15 is installed inside the working box 3, and a drive gear 18 is mounted on the output shaft of the servo motor 15. A mounting plate 17 is also installed inside the working box 3. A ball bearing 20 is mounted in the middle of the mounting plate 17. A driven gear 19, meshing with the drive gear 18, is mounted on the inner ring of the ball bearing 20. The driven gear 19 and the ball bearing 20 are connected to each other via a bushing 21. That is, the ball bearing 20 is first mounted on the mounting plate 17, and then the bushing 21 is mounted on the inner ring of the ball bearing 20. The bushing 21 extends out of the upper end of the ball bearing 20 and is fixedly connected to the driven gear 19. In actual operation, a mounting hole is provided in the middle of the driven gear to facilitate connection with the bushing 21. A thread is provided on the inner wall of the bushing 21, and a lowering mechanism for extending into the pile hole is threaded onto the bushing 21. In the actual real-time process, the top and bottom of the work box are provided with through holes for the lowering mechanism to move up and down, so that the lowering mechanism can move up or down along the work box, and the internal structure of the work box will not mechanically interfere with the lowering mechanism during the movement of the lowering mechanism.

[0039] Preferably, the output shaft of the servo motor 15 is also connected to a reducer 16 via a coupling, and the drive gear 18 is mounted on the output shaft of the reducer 16.

[0040] In some embodiments, the lowering mechanism includes a connecting mechanism 10 and a working head 9. The connecting mechanism 10 includes an outer sleeve 103, and a plurality of mounting bearings 102 are spaced apart on the periphery of the outer sleeve 103. At least three slots are formed on the outer wall of each mounting bearing 102, and a connecting plate 101 with an arc-shaped outer end face is held in each slot. The arc-shaped surface has threads that mate with the threads of the bushing 21. A suction pipe 104 and a pressure pipe 105 are installed inside the outer sleeve 103. The pressure pipe is used to inject water and / or air at a certain pressure, thereby using water or air to move the sediment.

[0041] In the actual real-time process, the slot is a dovetail groove, which directly connects two adjacent mounting bearings 102 to each other using the connecting plate 101. This reinforces the outer sleeve 103 using the mounting bearings 102 and the connecting plate 101, giving the connecting mechanism 10 rigidity and enabling it to connect with the threaded connection on the bushing 21. When the servo motor rotates, it drives the drive gear to rotate, which in turn drives the driven gear to rotate. Simultaneously, the driven gear rotates, synchronously driving the bushing to rotate. The rotation of the bushing drives the connecting plate to rotate, thus transmitting power to the working head, allowing the working head to rotate.

[0042] Because a mounting bearing is installed between the connecting plate and the outer sleeve, the outer sleeve will not rotate with the connecting plate when the connecting plate and the mounting bearing rotate.

[0043] Preferably, the suction pipe is used to communicate with a sludge pump located externally or mounted on the machine platform, and the pressure pipe is used to communicate with a power source located externally (i.e., not mounted on the machine platform) or mounted on the machine platform. When the pressure pipe is used to input water, the power source is a water pump; when the pressure pipe is used to input high-pressure gas, the power source is an air compressor. This is readily understood by those skilled in the art and will not be elaborated further here.

[0044] In the specific real-time process, the machine platform 6 is equipped with a slag box 14. The slag sucked out through the suction pipe is sucked into the slag box 14. Preferably, the slag box is equipped with a rotating shaft 13, which facilitates the rotation of the slag box 14, thereby cleaning out the slag in the slag box 14.

[0045] The structural design of the outer sleeve 103, mounting bearings 102, and connecting plate 101 in this invention ensures that the connecting mechanism 10 has sufficient rigidity. Furthermore, when the mounting bearings 102 on the outer sleeve are not connected to each other via the connecting plate 101, the outer sleeve 103 can bend to a certain extent under its own action. During the process of lowering the connecting mechanism 10 into the pile hole, the rotation speed of the lower part of the connecting mechanism 10 is relatively slow. Therefore, the operator can simply insert the connecting plate 101 into the mounting bearings 102. Alternatively, the connecting plate 101 can be pre-inserted into each mounting bearing 102, thus keeping the connecting mechanism 10 in an upright position as it is gradually lowered into the pile hole.

[0046] In some embodiments, the working head 9 includes a housing 91, with a mounting bearing 102 installed at the center of the top of the housing 91. A cavity 92 is formed inside the housing 91. A suction pipe 104 and a pressure pipe 105 within the outer sleeve 103 extend into the cavity 92 of the housing 91. The bottom of the housing 91 has a first end cover plate 93 and a second end cover plate 94. The distance between the second end cover plate 94 and the top of the housing 91 is greater than the distance between the first end cover plate 93 and the top of the housing 91. A suction port communicating with the cavity 92 of the housing 91 is formed between the first end cover plate 93 and the second end cover plate 94. A scanner 8 is installed on the circumferential wall of the housing 91, and a pressure sensor 22 is installed on the bottom surface of the second end cover plate 94. In actual operation, the suction port can be set according to the general size of the sludge, or the suction port can be set according to the maximum allowable size of the sludge pump. This allows the suction port to not only meet the requirements for suctioning sludge, but also to play a certain filtering role (i.e., filtering large-sized sludge), preventing large-sized sludge from entering the sludge pump and causing damage.

[0047] In some embodiments, a torque sensor 1 for monitoring the torque of the connecting mechanism is installed on the top of the working box 3. The torque sensor can also be installed on the inner wall of the bushing, thereby facilitating the monitoring of the torque during the rotation of the connecting mechanism 10, and allowing for the determination of the torque based on the torque sensor 1.

[0048] In the actual real-time process, a groove is provided on the bottom surface of the second end cover plate 94, and the pressure sensor 22 is installed in the groove so that the bottom surface of the pressure sensor is flush with the bottom surface of the second end cover plate 94.

[0049] In the actual real-time process, the mounting bearing 102 is provided with a wire hole, and the inner wall of the connecting plate 101 is provided with a wire clamping groove, so as to arrange the wiring connecting the scanner 8 and the pressure sensor 22 using the wire hole and the wire clamping groove.

[0050] In some embodiments, the edge of the second end cover plate 94 is equipped with a plurality of cutting teeth. The cutting teeth can cut and crush some large-sized sediments, and at the same time, the suction port and the cutting teeth can agitate large-sized sediments (such as boulders) during rotation, thereby exposing the small sediments covered by boulders and extracting them by the equipped slag pump under the action of the suction pipe. This avoids the small sediments from being stuck at the bottom of the pile hole due to the obstruction of boulders, thereby eliminating the impact of the undischarged small sediments on the bearing capacity of the single pile.

[0051] In the actual real-time process, the work box is also equipped with a controller and a display screen 2. The controller receives data from the pressure sensor, torque sensor and scanner and analyzes and stores the data. At the same time, the display screen can also be used for display.

[0052] In the actual real-time process, scanner 8 can be a 4D ultra-high-definition in-hole scanner, such as model GD3Q-GP. The torque sensor is a disc-type torque sensor, model HCNJ-106.

[0053] In some embodiments, a scanner 8 is also provided on the bottom surface of the second end cover plate 94. The scanner 8 on the bottom surface can be used to visually observe the condition of the sediment in the pile hole and check whether the sediment has been cleaned up, etc.

[0054] In some embodiments, a spiral-shaped guide plate is installed on the inner wall of the suction pipe 104, and the spiral direction of the guide plate is the same as the rotation direction when the servo motor moves. That is to say, the guide plate can also play a certain guiding role, transporting the sediment to the periphery of the pile hole to meet the cleaning methods of different cleaning methods.

[0055] This invention can agitate the boulders when cleaning sediment, thereby avoiding the problem of sediment not being cleaned properly due to obstruction by the boulders, ensuring that the sediment at the bottom of the pile hole can be thoroughly removed, and thus ensuring that the bearing capacity of a single pile is not affected by the sediment.

[0056] Based on the aforementioned rotary drilling pile hole formation quality testing and sediment removal device, this invention also provides a method for rotary drilling pile hole formation quality testing and sediment removal, comprising the following steps:

[0057] (1) After the rotary drilling rig forms the pile hole, the rotary drilling pile hole quality inspection and sediment cleaning device is moved to the pile hole position through the walking mechanism, and the lowering mechanism of the rotary drilling pile hole quality inspection and sediment cleaning device is aligned with the center of the pile hole.

[0058] (2) The servo motor in the working box drives the driven gear and bushing to rotate. During the rotation of the bushing, the connecting mechanism rotates synchronously. While rotating, the connecting mechanism gradually extends downward into the pile hole.

[0059] (3) The scanner connected to the working head below the connecting mechanism takes a 360° picture of the hole wall and transmits it to the controller in the working box to obtain data on the quality of the pile hole.

[0060] (4) When the pressure sensor value on the second end cover plate of the working head changes (when the second end cover plate does not contact the sediment at the bottom of the pile hole, the pressure sensor value is zero, that is to say, the pressure sensor value is zero for the distance before the lowering mechanism is above the top surface of the sediment at the bottom of the pile hole. The pressure sensor value will only change when the second end cover plate contacts the sediment at the bottom of the pile hole), the position of the lower end face of the working head is the position of the top surface of the sediment. The operator obtains the length I0 (in meters) of the top surface of the sediment based on the distance the lowering mechanism moves downward.

[0061] (5) The connecting mechanism continues to rotate downward and the pressure pipe inputs the cleaning water. Under the impact of the cleaning water, the sediment gradually floats up and enters the cavity of the working head through the suction port and is extracted through the suction pipe.

[0062] (6) When the suction pipe is used to suction the sediment, the working head rotates continuously to stir the rocks at the bottom of the pile, exposing the sediment that is covered by the rocks.

[0063] (7) When the suction pipe is suctioning the sediment in the pile hole, when the value of the torque sensor or the value of the pressure sensor reaches the set value, the lowering mechanism stops working; the staff obtains the bottom length I1 (in m) of the sediment based on the distance the lowering mechanism moves downward, and the sediment thickness I = I1 - I0 (I is in m).

[0064] In some embodiments, in step (5), when the sediment in the pile hole is not easy to be rinsed with clean water, compressed air is introduced into the pressure pipeline, and a negative pressure fan is connected to the outside of the suction pipeline to adsorb and clean the sediment in the pile hole.

[0065] In some embodiments, the controller is provided with a reversal threshold. When the value of the torque sensor or the pressure sensor triggers the reversal threshold but does not reach a set value (i.e., at the reversal threshold, the values ​​of the torque sensor and the pressure sensor are less than the set value), the servo motor rotates in the reverse direction, and the moving platform moves a certain distance on the machine platform before the servo motor continues to rotate in the forward direction. For example, when the working head 9 encounters a rock, the value of the torque sensor or the pressure sensor will suddenly increase but fall below the set value. This can be achieved by driving the moving platform 4 to move and the connecting mechanism 10 to rotate in the reverse direction, thereby moving the rock.

[0066] In some embodiments, when the suction pipe is suctioning sediment at the bottom of the pile hole, the moving platform reciprocates linearly on the machine platform, thereby driving the working head to fully agitate the sediment. However, in the prior art, a measuring hammer is used to measure the thickness of the sediment, but when there are stones obstructing the sediment, the measuring hammer cannot continue to move downwards, resulting in inaccurate sediment thickness measurement. The present invention, however, measures the sediment thickness while cleaning it, and determines the sediment thickness based on the values ​​of torque and pressure sensors, thus changing the method of sediment thickness detection and improving the accuracy of sediment detection.

[0067] In existing technologies, secondary hole cleaning methods all involve using a measuring hammer to detect the thickness of sediment, then removing the measuring hammer before lowering the hole cleaner. On the one hand, sediment detection and cleaning are performed in separate steps, resulting in a long construction period; on the other hand, after sediment thickness detection is completed (but before sediment cleaning), localized collapse may occur in the pile hole, causing a discrepancy between the actual sediment thickness and the detected thickness. The method of this invention integrates sediment thickness detection and cleaning into one process, meaning that localized collapse in the pile hole does not affect the sediment thickness detection, thereby further improving the accuracy of sediment thickness detection.

[0068] Meanwhile, this invention utilizes a scanner to simultaneously obtain data related to the quality of pile holes, integrating the quality of the pile hole wall, the thickness of sediment, and sediment cleaning into one, greatly improving work efficiency.

Claims

1. A method for inspecting the quality of rotary drilling pile holes and cleaning sediment, characterized in that, Includes the following steps: (1) After the rotary drilling rig forms the pile hole, the rotary drilling pile hole quality inspection and sediment cleaning device is moved to the pile hole position through the walking mechanism, and the lowering mechanism of the rotary drilling pile hole quality inspection and sediment cleaning device is aligned with the center of the pile hole. (2) The servo motor in the work box drives the driven gear and bushing to rotate. During the rotation of the bushing, the connecting mechanism rotates synchronously. While rotating, the connecting mechanism gradually extends downward into the pile hole. (3) The scanner connected to the working head below the connecting mechanism takes a 360° picture of the hole wall and transmits it to the controller in the working box to obtain the data on the quality of the pile hole; (4) When the pressure sensor value on the second end cover of the working head changes, the position of the lower end face of the working head is the position of the top surface of the sludge. The operator obtains the length I0 of the top surface of the sludge based on the distance the lowering mechanism moves downward. (5) The connecting mechanism continues to rotate downward and the pressure pipe inputs the cleaning water. Under the impact of the cleaning water, the sediment gradually floats up and enters the cavity of the working head through the suction port and is extracted through the suction pipe. (6) When the sludge is being sucked out through the suction pipe, the working head rotates continuously to agitate the boulders at the bottom of the pile, exposing the sludge that is covered by the boulders. (7) When the suction pipe is suctioning the sediment in the pile hole, the lowering mechanism stops working when the value of the torque sensor or the value of the pressure sensor reaches the set value; the staff obtains the bottom length I1 of the sediment and the sediment thickness I=I1-I0 based on the distance the lowering mechanism moves downward. The rotary pile hole quality inspection and sediment cleaning device includes at least a portion of its working unit capable of passing through the through hole of the machine platform and extending into the pile hole to inspect the pile hole quality and clean the sediment. The working unit includes a working box mounted on a mobile platform, a servo motor installed inside the working box, a drive gear mounted on the output shaft of the servo motor, an installation plate installed inside the working box, a ball bearing installed in the middle of the installation plate, a driven gear meshing with the drive gear mounted on the inner ring of the ball bearing, the driven gear and the ball bearing being connected to each other via a bushing, a threaded opening on the inner wall of the bushing, and a lowering mechanism for extending into the pile hole threadedly connected to the bushing. The lowering mechanism includes a connecting mechanism and a working head. The connecting mechanism includes an outer tube, and a number of mounting bearings are installed at intervals around the outer periphery of the outer tube. At least three slots are provided on the outer wall of the mounting bearings. A connecting plate with an arc-shaped outer end face is held in the slots. The arc-shaped surface is provided with threads that mate with the threads of the bushing. A suction pipe and a pressure pipe are installed inside the outer tube. The working head includes a housing, with a mounting bearing installed at the center of the top of the housing. A cavity is formed inside the housing. The suction pipe and pressure pipe inside the outer sleeve extend into the cavity of the housing, respectively. The bottom of the housing has a first end cover and a second end cover. The distance between the second end cover and the top of the housing is greater than the distance between the first end cover and the top of the housing. A suction port communicating with the cavity of the housing is formed between the first end cover and the second end cover. A scanner is installed on the circumferential wall of the housing, and a pressure sensor is installed on the bottom surface of the second end cover.

2. The method for detecting the quality of rotary drilling pile holes and cleaning sediment according to claim 1, characterized in that, In step (5), when the sediment in the pile hole is not easy to be washed with clean water, compressed air is introduced into the pressure pipeline, and the outside of the suction pipeline is connected to a negative pressure fan, which is used to adsorb and clean the pile hole.

3. The method for detecting the quality of rotary drilling pile holes and cleaning sediment according to claim 1, characterized in that, The controller is equipped with a reversal critical point. When the value of the torque sensor or the pressure sensor triggers the reversal critical point but does not reach the set value, the servo motor rotates in the reverse direction. After the moving platform moves a certain distance on the machine platform, the servo motor continues to rotate in the forward direction.

4. The method for inspecting the quality of rotary drilling pile holes and cleaning sediment according to claim 1, characterized in that, In step (5), when the suction pipe is suctioning the sediment at the bottom of the pile hole, the moving platform makes a linear reciprocating motion on the machine platform, thereby driving the working head to fully agitate the sediment.

5. The method for detecting the quality of rotary drilling pile hole formation and cleaning sediment according to claim 1, characterized in that, The rotary drilling pile hole formation quality inspection and sediment cleaning device includes a machine platform, on which a mobile platform is installed. The mobile platform is capable of moving on the machine platform. The mobile platform is equipped with a working unit for hole formation quality inspection and sediment cleaning. The machine platform has a through hole for easy operation.

6. The method for detecting the quality of rotary drilling pile holes and cleaning sediment according to claim 1, characterized in that, The work box is movable on a mobile platform.

7. The method for detecting the quality of rotary drilling pile holes and cleaning sediment according to claim 6, characterized in that, A torque sensor for monitoring the torque of the connecting mechanism is installed on the top of the work box.

8. The method for detecting the quality of rotary drilling pile holes and cleaning sediment according to claim 1, characterized in that, The edge of the second end cover is fitted with several cutting teeth.

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