Vertical distribution of mud in the hole of bored pile, submerged buoyancy type mud density continuous detector

Abstract

The present application relates to the technical field of mud density testing, and particularly discloses a vertical distribution submerged floating type mud density (specific gravity) continuous detector for mud in a cast-in-place pile hole, which comprises a floating device, a counterweight device, and a driving and main control system; the floating device and the counterweight device are used to be placed in the hole to measure the mud density at different depths; the floating device is arranged in the counterweight device, the floating device is provided with a linkage rod, the top of the linkage rod is sleeved with a pressure spring matched with a floating force sensor; the driving and main control system is connected with the counterweight shell through a transmission cable and a lifting rope, and the signal processor is used to transmit the data detected by the floating force sensor back to the driving and main control system through the transmission cable and the lifting rope. In the concrete pouring process, the measurement of the upper interface of the concrete is changed from the traditional manual measurement mode of the lagging rope and the weight to a front-mounted preset prediction, and the pouring height of the concrete is more accurately controlled.

Description

Technical Field

[0001] This invention relates to the field of mud density testing technology, specifically to a continuous submersible buoyancy mud density detector for vertically distributed mud in the borehole of a bored pile. Background Technology

[0002] Drilled piles are a common type of load-bearing foundation used in buildings, especially high-rise buildings and bridges. Drilling mud is a liquid commonly used in the drilling process; it primarily fills the borehole cavity, serving to suspend and balance water pressure. It acts as a wall-protecting fluid for the borehole cavity, directly affecting the borehole formation effect. The quality of the drilling mud determines its effectiveness in suspending and removing slag, thus influencing the concrete pouring and the quality of the pile. Therefore, the management and testing of drilling mud is a crucial aspect of drilled pile construction.

[0003] In the construction of bored piles, testing the quality of the drilling mud before concrete pouring is a crucial step to ensure smooth concrete pouring and high-quality pile formation. Currently, the specific gravity of the drilling mud is typically measured using a three-piece set (drilling mud hydrometer, drilling mud viscometer, and drilling mud sand content analyzer) in a balanced manner. This is a weighing measurement method.

[0004] The main drawbacks of this detection method are the sample acquisition process. First, it is affected by human factors. Second, it is affected by the sampling location (including plane and depth). Third, the mud flowing from the borehole to the mud pool on the ground is affected by both gravity and flow velocity, and is therefore relatively clear (light) mud.

[0005] Therefore, samples are generally obtained at the mud outlet on the borehole surface. The mud indicators obtained from the samples obtained in this way have limited representativeness. They can only represent the mud quality at the borehole opening (or upper part) and cannot accurately reflect the mud quality at different depths inside the borehole, especially the quality of the mud at deeper depths.

[0006] While some electronic mud hydrometers exist, their principle is based on measuring the specific gravity using a floating water column pressure difference. Although the method of reading (displaying) the results has changed, they still use the slurry from the surface mud pit as the sample. This method cannot accurately reflect the quality of the mud inside the borehole. The fundamental drawback is that the electronic mud hydrometer requires testing in a relatively stable and static location within the mud pit. The mud in these locations has flowed a long distance and has a long settling time, making it the clearest (lightest) slurry in the pit.

[0007] The application scenario of this electronic mud hydrometer is still mud stored in a surface mud pit. Using the settled mud stored in the surface mud pit as the test object (sample), it still cannot reflect the true state of the mud inside the borehole in real time. Because the mud sample tested by this electronic mud hydrometer is located far from the mud outlet in the borehole and in a relatively static mud pit, this area has not only undergone sedimentation for a certain period, but the detected mud sample is also a clear liquid on the surface of the mud pit. Therefore, the obtained indicators lack representativeness and still cannot reveal the actual quality of the drilling mud inside the borehole.

[0008] Given the shortcomings of the two mud testing methods mentioned above, both of which obtain results from mud samples taken from mud pits on the ground, the sampling methods using traditional mud hydrometers or the selection of test points for electronic mud hydrometers are greatly affected by human factors. Neither method can represent the actual situation of the mud in the borehole in real time or objectively, and it cannot reflect the mud specific gravity at different depths.

[0009] Due to the influence of building loads and geological conditions, the diameter and depth of boreholes vary considerably. Diameters range from 600cm to 3000cm and beyond. Borehole depths range from a few dozen meters to hundreds of meters, typically several tens of meters deep. In actual construction, due to limitations in the amount of mud pumped, when mud flows upwards from the bottom of boreholes of varying diameters to the borehole opening, not only is the flow velocity and volume very low, but the mud reaching the opening, due to gravity, is generally a light (low-density) liquid mud. Meanwhile, the specific gravity of the mud gradually increases from top to bottom within the borehole, with greater density at deeper depths. A higher specific gravity mud is more detrimental to concrete pouring, even hindering the smooth progress of the pouring work and, in severe cases, affecting the quality of the pile foundation. Summary of the Invention

[0010] The purpose of this invention is to provide a submersible buoyancy-type continuous mud density detector for vertical distribution of mud in bored piles, so as to solve the problems mentioned in the background art.

[0011] To achieve the above objectives, the present invention provides the following technical solution:

[0012] A continuous buoyancy mud density detector for vertical distribution of mud in bored pile holes, characterized in that it includes a buoyancy device, a counterweight device, and a drive and main control system.

[0013] The buoyancy device and counterweight device are used to be placed inside the borehole to measure the mud density at different depths and the sedimentation state of the mixture at the bottom of the hole.

[0014] The counterweight device includes a counterweight housing and several guide rods. The counterweight housing contains a first sensor and a signal processor for measuring the stress generated by the buoyancy device. The several guide rods are installed at the bottom of the counterweight housing to form a U-shaped frame.

[0015] The buoyancy device is located within a U-shaped frame, and a second sensor for measuring the second buoyancy data generated by the buoyancy device is installed within the frame.

[0016] The buoyancy device is equipped with a linkage rod, and the second sensor is sleeved on the linkage rod and connected to the top of the first sensor through a pressure spring.

[0017] The drive and main control system is connected to the counterweight housing via a transmission cable that also serves as a lifting rope.

[0018] The signal processor is used to convert the stress data detected by the first sensor into first buoyancy data. The first buoyancy data and the second buoyancy data are transmitted back to the drive and main control system through the transmission cable and lifting rope.

[0019] Furthermore, the buoyancy device is spherical or cylindrical in shape.

[0020] Furthermore, a wellhead support is installed near the borehole to support the transmission cable and also facilitate the sliding of the pull rope.

[0021] Furthermore, an "X"-shaped limiting bracket is installed on the guide rod, the second sensor is fixed on the limiting bracket and located on the bottom surface of the limiting bracket, and connecting seats are installed at both ends of the pressure spring, wherein the connecting seat at the upper end is connected and cooperates with the first sensor, and the connecting seat at the lower end is connected to the top of the linkage rod.

[0022] Furthermore, the drive and main control system includes a housing, in which a cable reel bracket is installed. A cable reel is mounted on the cable reel bracket, and the cable reel is used to reel in the transmission cable and also serves as a lifting rope.

[0023] Furthermore, the drive and main control system also includes a conductive slip ring, which is located at one end of the cable reel and is used to transmit data back from the transmission cable and lifting rope.

[0024] Furthermore, the drive and main control system also includes a chassis access port, a function motherboard, and a display installed in the enclosure. The returned data is led out through the conductive slip ring, connected to the ground chassis access port via a connecting cable, and then connected to the function motherboard. The data is read by the display.

[0025] Furthermore, the drive and main control system also includes a printer installed in the enclosure and a power supply battery for the entire machine.

[0026] Furthermore, the wellhead bracket is used to lock the transmission cable and lifting rope at a fixed depth position, and the transmission cable and lifting rope are provided with depth markings.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. It employs a submersible detector to perform detection inside the borehole, allowing for both point-based and continuous detection. The detection samples are unaffected by human factors.

[0029] II. Real-time detection and reflection of the specific gravity of borehole mud, with results displayed and stored instantly.

[0030] Third, this invention utilizes Archimedes' principle to directly submerge the mud detection device into the borehole cavity (fully submersible type) to conduct real-time detection of mud at different depths throughout the entire borehole section. The detection results can be obtained by point measurement or continuous measurement, which more accurately, practically and directly reflects the vertical mud density (specific gravity) state in the borehole, and avoids the influence of human factors in manual sampling.

[0031] Fourth, the sampling environment is in a natural state, avoiding human interference and influence. The entire borehole section of mud can be used as a sampling sample, and the results more accurately reflect the actual condition of the mud at different depths within the borehole. It can not only detect the density (specific gravity) of the mud, but also infer the thickness of the sediment at the bottom of the borehole, providing more practical guidance for concrete pouring. (The sediment at the bottom of the borehole refers to a mixture with a density close to or greater than the density of the poured concrete, which cannot be replaced or removed by the concrete and settles at the bottom of the borehole.) These sediments (i.e., sediment) at the bottom of the borehole (pillar bottom) will seriously affect the bearing capacity of the pile and create safety hazards for the structure.

[0032] IV. After the pile grouting work begins, during the concrete pouring process (this invention has set buoyancy threshold ranges based on the density range of concrete and the density range of laitance (cement mortar), respectively), the upper interface of the concrete can be measured and judged to determine the height (depth) of the upper interface of the concrete pouring, avoiding serious over-pouring and waste of concrete materials. This transforms the traditional, lagging measurement method of manual rope and plumb bob into a pre-set prediction method, and more accurately controls the concrete pouring height.

[0033] V. The application environment can be extended to other deep water bodies and liquids. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0035] Figure 2 This is a schematic diagram of the counterweight device and buoyancy device of the present invention.

[0036] Figure 3 For the present invention Figure 2 A longitudinal section diagram.

[0037] Figure 4 This is a schematic diagram of the drive and main control system structure of the present invention.

[0038] Figure 5 For the present invention Figure 4 A schematic diagram of the internal structure after removing part of the box.

[0039] Figure 6 For the present invention Figure 5 Another perspective illustration.

[0040] In the diagram: 1-Buoyancy device, 2-Connecting rod, 2a-Limit bracket, 3-Second sensor, 4-Pressure spring, 5-First sensor, 5a-Signal processor, 6-Counterweight device, 6a-Counterweight housing, 6b-Guide rod, 7-Transmission cable / lifting rope, 8-Wellhead bracket, 9-Roller, 10-Roller bracket, 11-Conductive slip ring, 12-Connecting cable, 13-Chassis access port, 14-Function motherboard, 15-Display, 16-Data interface, 17-Buzzer, 18-Indicator light, 19-Power supply battery, 20-Power switch, 21-Box, 22-Movable cover, 23-Handle, 24-Crank handle, 25-Drill hole, 26-Frame. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] In the description of this invention, it should be noted that the terms "upper end," "lower end," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," 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 this 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 this invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral 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 a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] Please see Figures 1 to 6 The present invention provides a technical solution:

[0045] A fully submersible buoyancy method and device for detecting the density (specific gravity) of drilling mud and its mixture in the vertically continuous distribution state of drilling mud in bored piles used in building foundation engineering. This method is more suitable for the construction environment of bored piles, accurately reflecting the specific gravity of the drilling mud at different depths within the hole, avoiding discrepancies caused by sampling methods, better guiding drilling mud management and concrete pouring, ensuring drilling safety, ensuring the quality of pile formation, and guaranteeing both project quality and safety.

[0046] Because balanced mud gravity testing or floating (insertion) electronic mud gravity testing methods can only be performed on the ground, the representativeness and acquisition of mud samples are subject to human influence. Due to limitations in the testing methods and means, the results only represent the quality of the mud flowing from the borehole to the surface mud pool, and cannot represent the actual quality of the mud inside the borehole. Existing testing methods still use the slurry flowing to the surface mud pool as a sample, which still cannot represent the actual situation of the mud inside the borehole and is easily affected by human factors. Therefore, this invention focuses on solving the problems existing in the prior art.

[0047] This invention relates to a method and apparatus for detecting the density distribution of drilling mud along the vertical direction and the thickness of the sediment at the bottom of the borehole before concrete pouring for bored piles.

[0048] The density (specific gravity) of the drilling mud affects the quality of the concrete pouring for pile formation, and the thickness of the sediment at the bottom of the hole directly affects the pile's bearing capacity. (The sediment at the bottom of the hole referred to here is relative to the density of the concrete; mixtures with a density equal to or higher than that of the concrete are categorized as sediment. This is because when the density of the mixture at the bottom of the hole is equal to or higher than that of the concrete, the concrete poured through the tremie pipe cannot displace it. This undisplaced mixture will remain below the concrete (pile bottom), forming what is known as sediment.)

[0049] The purpose of this invention is to use a fully submersible mud (mixture) density detector before concrete pouring to detect the vertical distribution of mud and the sedimentation state of the mixture at the bottom of the borehole. Simultaneously, after concrete pouring begins, it can be used to measure the height (depth) of the concrete interface to guide the pouring process, ensuring pile quality and controlling the pouring height to avoid excessive over-pouring, wasting concrete, and causing demolition waste.

[0050] Compared to the commonly used balanced mud hydrometers (or the emerging floating insertion electronic mud hydrometers in ground mud pits), its advantages are: First, it instantly and accurately detects and reflects the density distribution of the drilling mud along the vertical direction throughout the borehole. Second, it can determine whether the mixture or sediment at the bottom of the borehole (near the bottom of the borehole) has a density approximately equal to or greater than that of concrete. Third, it avoids the influence of subjective human factors that can easily affect mud testing on the ground with balanced mud hydrometers or floating insertion electronic mud hydrometers. Fourth, it objectively and accurately reflects the quality of the borehole mud, better guiding concrete pouring and ensuring the quality of concrete pouring and pile formation. Fifth, it records, stores, and outputs data instantly, and is networked.

[0051] The method of this invention utilizes Archimedes' principle F_buoyancy = ρ_liquid g_weight v_displaced. According to this principle, when v_displaced is a constant value, the change in the buoyancy value reflects the change in the density value of the liquid. In the same environment, g_weight is a constant value.

[0052] That is: ρ_liquid = F_buoyancy / g_weight / v_displaced

[0053] This invention utilizes this principle, employing a V-shaped object of fixed volume, which is submerged in the drilling mud column via a counterweight device 6. Due to gravity, the mud density varies at different depths. When the counterweight device is at different depths, the measured buoyancy value changes accordingly with the mud density, reflecting the change in mud density (specific gravity). Because the mud is fluid, the spring pitch will not be obstructed or stuck by particles, and the spring density is greater than the surrounding medium, so the pressure in all directions can be considered equal. The spring will not be compressed to the point where the two coils stick together, nor will it wrap around the pressure spring and guide rod 6b. Therefore, the amount of displacement change of the first sensor 3 can be guaranteed to measure the buoyancy.

[0054] The buoyancy device 1 of this invention is designed so that the v-displacement is either suspended or submerged in pure water under standard conditions. The buoyancy device 1 is a spherical or cylindrical shape, etc., with a certain volume and appropriate buoyancy. The material can be metal or non-metal, can be molded, and has appropriate compressive strength.

[0055] The components of this invention include: a buoyancy device 1, a connecting rod 2, a first sensor 5, a pressure spring 4, a second sensor 3, a counterweight device 6, a transmission cable / lifting rope 7, a wellhead support 8, a reel 9, a reel support 10, a conductive slip ring 11, a connecting cable 12, a ground chassis access port 13, a main board 14, a display 15, a data interface 16 (for connecting a random printer), a buzzer 17, an indicator light 18, a built-in battery 19, a power switch 20, and a housing 21.

[0056] The buoyancy device 1, connecting rod 2, first sensor 5, pressure spring 4, second sensor 3, and counterweight device 6 form a combined unit, constituting a fully submersible borehole mud specific gravity detector. The buoyancy device 1, connecting rod 2, second sensor 3, and pressure spring 4 are located within the frame 26, while the first sensor 5 is housed within the counterweight housing 6a. The transmission cable / lifting rope 7 is wound onto a reel 9, which is mounted on a reel bracket 10. Its end is led out through a conductive slip ring 11, connected via a connecting cable 12 to the ground chassis access port 13, and then connected to the main board 14. Data is read by the display 15 or printed out by the random printer. The power supply battery 19 is built into the housing 21. The wellhead bracket 8 (with rollers) is used to lock the transmission cable / lifting rope 7 and fix its depth position. Depth markings are provided on the transmission cable / lifting rope 7. The housing 21 of the present invention is equipped with a crank handle 24 for cranking a reel 9; a buzzer 17 for playing voice; and a movable cover 22 for opening the housing 21 for maintenance and a handle 23 for carrying the entire housing 21.

[0057] This invention utilizes a material of suitable density to fabricate a buoyancy device 1 with a specific volume and shape, and a suitable buoyancy density (specific gravity) (allowing it to remain suspended or submerged in water). This buoyancy device 1 is installed within a counterweight device 6. The overall density (specific gravity) of the buoyancy device 1 and the counterweight device 6 is greater than the density of the concrete used, ensuring that the device can smoothly sink into the mixture (or concrete) at the bottom of the hole. This counterweight device is connected to the ground-based instruments and the drive and main control system via a transmission cable / lifting rope 7.

[0058] When the buoyancy device 1 is placed inside the borehole 25 containing liquid or a mixture, a change in buoyancy will occur. This change in buoyancy is sensed by the pressure spring 4, which can be either pressing or stretching (compressing), or by the change in displacement. The first sensor 5 senses the change in stress (pressure), or the second sensor 3 measures the change in displacement. The measurement of the change is a conversion between mechanical and electrical properties. After data processing and conversion by the mainboard 14, the density of the measured liquid or mixture can be directly reflected.

[0059] When used for detection, the buoyancy device 1 and the counterweight device 6 are placed in the mud liquid inside the borehole 25, or lowered to the bottom of the borehole at the location to be detected. Because the buoyancy device 1 and the counterweight device 6 are a combined unit, and their overall density (specific gravity) is much greater than the density of the surrounding liquid or mixture (sludge), the buoyancy device 1 will experience a corresponding change in buoyancy regardless of whether it is in the mud or the mixture (sludge). This buoyancy is exerted by the connecting rod 2 through the connecting seat 4a at the top of the connecting rod 2, and then transmitted to the first sensor 5 for sensing and measurement through the pressure spring 4 and the connecting seat 4a at the top that is connected to the buoyancy sensor 5, or by the second sensor 3 for measuring the change in the connecting rod 2. The second sensor can be used to measure the displacement of the buoyancy device 1. The displacement of the buoyancy device 1 can be measured by measuring the change in inductance or by using a Hall sensor (or other variables), such as a buoyancy displacement sensor. The measured displacement is then converted into second buoyancy data. The first sensor 5 can be used to measure the change in stress (pressure) of the buoyancy device 1, such as by using a buoyancy stress sensor. The signal processor 5a converts the measured stress (pressure) into first buoyancy data. The first buoyancy data and the second buoyancy data are transmitted via the transmission cable and lifting rope 7 (signal line) to the main board 14 of the drive and main control system for analysis and processing, forming mud density data, which is then displayed on the display 15 or printed out.

[0060] The present invention employs a fully submersible mud (mixture) density detector before concrete pouring to detect the vertical distribution of mud and the sedimentation state of the mixture at the bottom of the borehole, thereby guiding the concrete pouring work and ensuring the quality of pile formation.

[0061] During the concrete pouring process, the traditional method for measuring the depth of the concrete interface is to use a plumb bob with a measuring rope. This method is not only a lagging measurement method, but the timing of the measurement and the results obtained are also easily affected by human subjective initiative and experience.

[0062] Based on the fact that concrete has a relatively stable density value (or density range), and its density value is greater than that of the mud, mud mixture, or laitance (referring to cement mortar without aggregate particles) within the borehole 25, the detector of this invention sets this density range as the prediction threshold for judging concrete. Therefore, the detector of this invention can also be used to measure (monitor, predict) the depth reached by the upper interface of concrete within the borehole during concrete pouring, or to pre-set the monitoring depth to predict the depth position reached by the upper interface of concrete.

[0063] In this scheme, when used in the concrete pouring process, the counterweight device 6 is pre-positioned at a certain depth within the borehole. When the concrete rises to the pre-set depth of the buoyancy device 1, it will generate an upward buoyancy force. When the buoyancy value reaches the set normal value, a trigger signal will be generated, thus issuing a warning signal. The threshold range for mud, mud mixture (sediment), and laitance is set in the range of 1.1-2.0, and the threshold range for concrete is set in the range of 2.3-2.6.

[0064] The depth position refers to the position reached by the concrete within the borehole 25 during the pouring process. This can be read because the transmission cable / lifting rope 7 has a depth scale.

[0065] The detector using this scheme measures, monitors, and forecasts the upper interface of the concrete inside the borehole, providing a proactive pre-setting and forecasting capability.

[0066] This invention is used to measure the actual depth of the concrete upper interface within the borehole during the concrete pouring process, or to monitor and warn of the rise of the concrete upper interface, so as to pre-control the concrete pouring height, ensure the quality of the pile, avoid serious over-pouring and waste of concrete materials, and assist the concrete pouring work to improve construction efficiency and benefits.

[0067] In this scheme, during the concrete pouring process, when the concrete is poured into the borehole through the grouting pipe, the concrete in the borehole will rise upward (to the ground). The buoyancy value is measured by the buoyancy device 1, which can be used to monitor the rise of the concrete surface.

[0068] This invention employs a submersible detector, using a crank 24 to crank the reel 9 to control the winding of the transmission cable / lifting rope 7. Through the depth scale on the reel, the buoyancy device 1 directly and in real time measures the density of the mud at different depths along the vertical direction inside the borehole. This provides a multi-point or continuous reflection of the mud gradient distribution inside the borehole, overcoming the shortcomings of traditional methods that involve sampling from a ground mud pit, where the samples are easily affected by human factors and have poor representativeness.

[0069] This invention measures and determines the density and sediment thickness of the mixture at the bottom of a borehole to guide the secondary cleaning operation before concrete pouring, ensuring the quality of the pile. This solves the problem that current measurement methods cannot measure or determine the density of the mixture inside the borehole.

[0070] This invention can be used to monitor or measure the rise of concrete in the borehole during the concrete pouring process, predict the depth reached by the concrete surface, guide the concrete pouring operation, ensure the pouring height at the top of the pile, avoid serious over-pouring, waste of materials, and demolition operations, and improve construction efficiency and benefits.

[0071] This invention employs two sensors, a first sensor 5 and a second sensor 3. Both sensors are capable of individually measuring the buoyancy of the buoyancy device 1, and can also simultaneously measure the buoyancy of the mixture. Using each sensor simultaneously allows for more effective identification of mixtures. The difference lies in the sensing method and the way the parameters are acquired: when the buoyancy device 1 measures mud, mud mixture (sediment), laitance, etc., within the hole, there will be different displacement changes. The second sensor 3 measures the change in the amount of buoyancy of the buoyancy device 1 driving the connecting rod, and / or the first sensor 5 measures the stress of the connecting rod 2. Because the measurement parameters are different, the measured values ​​can be compared or identified.

[0072] When used alone, the sensor identifies the type of object being measured based on the value measured by the second sensor 3 or the first sensor 5: such as whether it is a mud mixture or concrete.

[0073] When used in combination, the value measured by the second sensor 3 can also be used as a reference for verification. The comparison range of the values ​​measured by the two sensors is basically the same. When a large deviation occurs, the data are analyzed separately to determine which one is correct and to rule out whether the detector is malfunctioning.

[0074] The two sensors have redundant backups and high reliability to prevent single points of failure. When one fails or outputs an abnormal value, the other ensures that the detection data is not interrupted.

[0075] The parts of this invention not described herein are prior art, or may be the same as prior art, or may be known art, or may be implemented using prior art, and will not be described in detail here.

[0076] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A submersible buoyancy-based continuous drilling mud density detector for vertical distribution of drilling mud inside bored piles, characterized in that, It includes a buoyancy device (1), a counterweight device (6), and a drive and main control system; The buoyancy device (1) and the counterweight device (6) are used to be placed in the borehole (25) to measure the mud density at different depths and the sedimentation state of the mixture at the bottom of the hole. The counterweight device (6) includes a counterweight housing (6a) and several guide rods (6b). The counterweight housing (6a) contains a first sensor (5) for measuring the stress generated by the buoyancy device (1) and a signal processor (5a). Several guide rods (6b) are installed at the bottom of the counterweight housing (6a) to form a U-shaped frame (26). The buoyancy device (1) is located inside a U-shaped frame (26), and a second sensor (3) is installed inside the frame (26) for measuring the second buoyancy data generated by the buoyancy device (1). The buoyancy device (1) is equipped with a connecting rod (2), and the second sensor (3) is sleeved on the connecting rod (2) and connected to the top of the first sensor (5) through a pressure spring (4); The drive and main control system is connected to the counterweight housing (6a) via a transmission cable that also serves as a lifting rope (7); The signal processor (5a) is used to convert the stress data detected by the first sensor (5) into first buoyancy data. The first buoyancy data and the second buoyancy data are transmitted back to the drive and main control system through the transmission cable and lifting rope (7).

2. The continuously submersible buoyancy mud density detector for vertical distribution of mud in bored piles as described in claim 1, characterized in that, The buoyancy device (1) is spherical or cylindrical.

3. The continuously submersible buoyancy mud density detector for vertical distribution of mud in bored piles as described in claim 1, characterized in that, A wellhead support (8) for supporting the sliding of the transmission cable and lifting rope (7) is installed near the borehole (25).

4. The continuously submersible buoyancy mud density detector for vertical distribution of mud in bored piles as described in claim 1, characterized in that, An "X"-shaped limiting bracket (2a) is installed on the guide rod (6b). The second sensor (3) is fixed on the limiting bracket (2a) and located on the bottom surface of the limiting bracket (2a). Connecting seats (4a) are installed at both ends of the pressure spring (4). The connecting seat (4a) at the upper end is connected to the first sensor (5), and the connecting seat (4a) at the lower end is connected to the top of the linkage rod (2).

5. The continuously submersible buoyancy mud density detector with vertical mud distribution in the borehole of a bored pile as described in claim 1, characterized in that, The drive and main control system includes a housing (21), in which a cable reel bracket (10) is installed. A cable reel (9) is mounted on the cable reel bracket (10), which is used to reel in the transmission cable and also as a lifting rope (7).

6. The continuously submersible buoyancy mud density detector with vertical mud distribution in the borehole of a bored pile as described in claim 5, characterized in that, The drive and main control system also includes a conductive slip ring (11), which is located at one end of the reel (9) and is used to transmit data back from the cable and lifting rope (7).

7. The continuously submersible buoyancy mud density detector for vertical distribution of mud in bored piles as described in claim 6, characterized in that, The drive and main control system also includes a chassis access port (13), a function motherboard (14) and a display (15) installed in the enclosure (21). The data transmission conductive slip ring (11) is led out through the conductive slip ring (11), connected to the ground chassis access port (13) via the connecting cable (12), and then connected to the function motherboard (14). The data is read by the display (15).

8. The continuously submersible buoyancy mud density detector for vertical distribution of mud in bored piles as described in claim 6, characterized in that, The drive and main control system also includes a random printer output (16) installed in the enclosure (21) and a power supply battery (19) for the whole machine.

9. A continuous drilling mud density detector with vertical distribution in borehole of cast-in-place piles as described in claim 1, characterized in that, The wellhead bracket (8) is used to lock the transmission cable and lifting rope (7) at a fixed depth position, and the transmission cable and lifting rope (7) is provided with depth markings.

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