A portable pile foundation construction hole collapse monitoring device

Abstract

The utility model discloses a portable pile foundation construction hole collapse monitoring devices belongs to pile foundation construction technical field, and this hole collapse monitoring device is close to the pile foundation setting and is composed of the probe rod, the soil moisture content sensor, the data / power transmission line and the earth pressure calculation instrument, a plurality of soil moisture content sensors are arranged on the axial direction of the probe rod, and a plurality of soil moisture content sensors are electrically connected with the earth pressure calculation instrument through the data / power transmission line who is threaded in the probe rod inside. This hole collapse monitoring device can improve the safety and efficiency in the pile foundation construction process, realizes the real -time monitoring to the soil moisture content, lateral pressure and so on parameter, and can effectively early -warning potential hole collapse risk.

Description

Technical Field

[0001] This utility model belongs to the field of pile foundation construction technology, and relates to an instrument for monitoring and preventing pile foundation collapse during reservoir bank bridge construction, specifically providing a portable pile foundation collapse monitoring device. Background Technology

[0002] Soil moisture content has a significant impact on geotechnical engineering construction. For example, if the soil moisture content is too high, it is easy to compact it into rubbery soil with unstable bearing capacity. If the moisture content is too low, the compaction coefficient cannot be achieved and the soil will not be dense. The amount of moisture content can also affect the stability of slopes, foundation pits, etc. Therefore, it is very important to measure the soil moisture content in geotechnical engineering.

[0003] During bridge pile foundation construction in reservoir areas, frequent fluctuations in groundwater levels and dynamic changes in soil lateral pressure can easily lead to pile foundation wall collapse accidents. Traditional borehole collapse monitoring technologies have the following drawbacks: First, monitoring methods are outdated, relying on pre-embedded earth pressure cells or manual sampling, which cannot obtain real-time soil parameters in deep borehole areas; second, parameters are limited, with existing equipment mostly making qualitative judgments based on single parameters (such as water content or pore water pressure) without being linked to soil mechanics models for calculation. Therefore, there is an urgent need in this field for a portable device that can monitor the soil condition in deep boreholes in real time, monitor lateral pressure, and provide construction guidance. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a portable pile foundation construction hole collapse monitoring device that is simple in structure, convenient to use, and accurate in measurement, aiming to solve the problem of the inability to predict potential hole wall collapse in the existing technology, and also to solve the problem of the inability to monitor the physical state inside the pile in time when the pile foundation is too deep.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This invention provides a portable borehole collapse monitoring device for pile foundation construction. The device is positioned close to the pile foundation and consists of a probe, soil moisture sensors, a data / power transmission line, and an earth pressure calculation instrument. Multiple soil moisture sensors are arranged axially along the probe, and these sensors are electrically connected to the earth pressure calculation instrument via a data / power transmission line passing through the inside of the probe. Using this design, the borehole collapse monitoring device is both reasonable and applicable, effectively solving the problem of predicting borehole collapse in traditional reservoir bank pile foundation construction.

[0007] Optionally, the probe rod has a cone head and a hammer head at each end. The hammer head is a steel load-bearing hammer head with a rubber protective layer. The cone head is a high-strength metal drill bit with a tungsten carbide wear-resistant coating, a tip angle of 60°±5°, and a spiral groove. Through this optimized design of the cone head and hammer head at both ends of the probe rod, this portable pile foundation construction borehole collapse monitoring device can provide better penetration and stability during construction, improving the accuracy and reliability of monitoring. This design makes the device more competitive in practical applications, meeting the needs of complex construction environments and ensuring the safety and effectiveness of the construction process.

[0008] Optionally, the probe is configured with a telescopic adjustable structure, consisting of multiple modular steel pipe sections connected by threads. This telescopic adjustable probe allows the device to flexibly adapt to diverse soil conditions in different construction scenarios. Its adjustability, portability, and ease of operation make the equipment more efficient and convenient to use on-site, providing timely and accurate soil condition information to help construction personnel make informed decisions and ensure construction safety.

[0009] Optionally, the multi-section modular steel pipes of the probe may have the same or different lengths; each section of the modular steel pipe is equipped with at least one soil moisture sensor. This design makes the portable pile foundation construction collapse monitoring device more flexible and adaptable, providing real-time and accurate soil moisture monitoring in varying construction environments. This configuration of multi-section modular steel pipes not only enhances the functionality of the device but also strengthens the safety and effectiveness of construction, helping construction personnel better manage potential risks and ensuring the smooth progress of the project.

[0010] Optionally, multiple soil moisture sensors are arranged in a spiral pattern on the outer surface of the probe. This allows the portable pile foundation construction borehole collapse monitoring device to achieve more efficient soil monitoring. This design not only improves monitoring coverage and accuracy but also enhances the device's adaptability to complex soil conditions, providing construction personnel with more reliable data support and ensuring the safety and effectiveness of the construction process. This spiral array sensor configuration significantly improves the device's performance, providing strong technical support for real-time monitoring and risk assessment.

[0011] Optionally, the borehole collapse monitoring device also includes a magnetic base located at the bottom of the earth pressure calculation instrument, which is used to attract the hammer head of the probe. This enhances the overall structure of the portable borehole collapse monitoring device for pile foundation construction, particularly in terms of monitoring stability and ease of operation. This design effectively improves the reliability of monitoring data, ensuring accurate soil condition information under complex soil conditions and providing timely and effective decision support for construction personnel. Simultaneously, the simplified connection method makes the entire device more efficient in field applications, further improving construction safety and effectiveness.

[0012] Optionally, the earth pressure calculation instrument includes a display module, a calculation module, a data / power transmission module, and a data input module. The data / power transmission module connects to the data / power transmission line and the data input module. The data input module connects to both the display module and the calculation module. The calculation module connects to the display module, which displays the real-time dynamic curve of active earth pressure (Pa) and safety threshold warning indicators. By subdividing the earth pressure calculation instrument into multiple functional modules, this portable pile foundation construction collapse monitoring device can achieve efficient and accurate soil condition monitoring. The combination of the real-time dynamic curve and safety threshold warning from the display module enhances the construction personnel's understanding of the soil condition, improving the safety and scientific rigor of the construction process. This modular design makes the maintenance and upgrade of the entire system more flexible, effectively adapting to different construction environments and monitoring needs.

[0013] Optionally, the earth pressure calculation instrument may be equipped with one or more of the following functional interfaces: HDMI, USB, POWER, or WLAN. This variety of interfaces allows the portable pile foundation construction collapse monitoring device to achieve more efficient data management and use. Flexible data export methods and real-time monitoring capabilities not only improve monitoring convenience but also enhance personnel efficiency and safety. This design makes the equipment more adaptable to practical applications, meeting the needs of different types of projects and ensuring timely data acquisition and decision support during construction.

[0014] The portable pile foundation construction collapse monitoring device of this utility model has the following beneficial effects:

[0015] 1. Simple structure: Easy to manufacture and assemble. The device adopts a modular structure, which reduces the complexity between components, simplifies the production process, and lowers manufacturing costs. It is also easy to maintain. Due to its simple structure, users can quickly get started with maintenance and upkeep, reducing reliance on professional technicians.

[0016] 2. Easy to use: The device is equipped with a built-in calculation module that can calculate and output the lateral earth pressure and pressure curve of the pile foundation in real time, making it easy for users to quickly obtain data and make timely decisions; and the intuitive data display allows users to clearly view the monitoring results through the display module, improving the convenience of operation.

[0017] 3. Robust and Reliable: The sensor protection design incorporates the soil moisture sensor within the probe rod, preventing damage during probe insertion and improving equipment reliability. Furthermore, the threaded connection of the probe rod ensures a secure connection between sections during use, enhancing overall stability and flexibility.

[0018] 4. Improve construction efficiency: Monitoring and feedback, through real-time measurement of earth pressure, can quickly determine the stability of the borehole wall, reduce construction delays caused by misjudgment, and thus speed up the construction progress; and simplify the construction process, real-time monitoring and data feedback enable construction personnel to adjust construction strategies in a timely manner, avoid unnecessary duplication and waste, and improve overall efficiency.

[0019] In summary, this portable pile foundation construction borehole collapse monitoring device demonstrates significant advantages in structure, operation, and function. It not only effectively improves the safety and efficiency of pile foundation construction but also enables real-time monitoring of key parameters such as soil moisture content and lateral pressure. The use of this device can effectively warn of potential borehole collapse risks, providing strong technical support for construction sites, ensuring project quality and safety, and providing a powerful guarantee for the smooth implementation of related projects.

[0020] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0022] Figure 1 A schematic diagram illustrating the application of the portable pile foundation construction collapse monitoring device of this utility model;

[0023] Figure 2 This is a schematic diagram of the portable pile foundation construction collapse monitoring device of this utility model;

[0024] Figure 3This is another structural schematic diagram of the portable pile foundation construction collapse monitoring device of this utility model;

[0025] Figure 4 for Figure 2 A schematic diagram of an earth pressure calculation instrument.

[0026] Figure reference numerals: 1-Bore collapse monitoring device, 2-Pile foundation; 11-Probe rod, 12-Soil moisture sensor, 13-Data / power transmission line, 14-Earth pressure calculation instrument, 15-Magnetic base; 111-Cone head, 112-Hammer head; 141-Display module, 142-Calculation module, 143-Data / power transmission module, 144-Data input module. Detailed Implementation

[0027] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0028] like Figure 1-4 As shown in this embodiment, the portable pile foundation construction collapse monitoring device 1 is installed close to the pile foundation 2 and consists of a probe 11, a soil moisture sensor 12, a data / power transmission line 13, and an earth pressure calculation instrument 14. The probe 11 is the core structure of this collapse monitoring device 1, responsible for being inserted into the soil for monitoring. Its design must ensure sufficient strength and rigidity to withstand the lateral pressure of the soil. Multiple soil moisture sensors 12 are installed along the axial direction of the probe 11. Each soil moisture sensor 12 is responsible for detecting the moisture content of the soil at different depths, providing stratified moisture content data to help analyze soil conditions more accurately. Data / power transmission line 13 is installed inside probe 11 to connect multiple soil moisture sensors 12 to earth pressure calculation instrument 14. This design ensures stable signal transmission and avoids interference from the external environment. Earth pressure calculation instrument 14 is responsible for receiving data from each soil moisture sensor 12, processing and analyzing it. It can calculate the change in lateral pressure of the soil based on the soil moisture data and evaluate it in conjunction with the soil mechanics model.

[0029] Adopting the above scheme, this borehole collapse monitoring device 1 has the following functional characteristics: First, multi-point monitoring; the setting of multiple soil moisture content sensors 12 enables the device to monitor soil moisture content at different depths, thereby obtaining more comprehensive soil information. Second, real-time data processing; the earth pressure calculation instrument 14 can process sensor data in real time, quickly provide feedback on soil conditions, and promptly warn of potential borehole collapse risks. Third, portable design; the overall design of the device takes portability into consideration, making it suitable for on-site construction and convenient for operators to deploy quickly. Fourth, improved monitoring accuracy; the coordinated use of multiple soil moisture content sensors 12 improves the monitoring accuracy of soil conditions and reduces judgment errors caused by single parameters. Thus, this portable borehole collapse monitoring device for pile foundation construction is particularly suitable for construction sites under complex geological conditions such as bridge pile foundations, effectively improving construction safety and reducing the risk of accidents caused by unstable soil conditions. Through real-time monitoring and analysis, construction personnel can adjust construction plans in a timely manner to ensure the smooth progress of the project.

[0030] In this embodiment, the probe rod 11 has a cone head 111 and a hammer head 112 at both ends. The cone head 111 is made of high-strength metal drill bit and is designed to effectively penetrate the soil, facilitating the insertion of the probe rod 11. The tip angle of the cone head 111 is 60°±5°, which helps to reduce the resistance when inserting into the soil and improve the insertion efficiency. The surface of the cone head 111 is coated with a tungsten carbide wear-resistant layer, which enhances its wear resistance, extends its service life, and is suitable for use in various soil conditions. It also has a spiral groove to facilitate the insertion of the probe rod 11 into the soil. The hammer head 112 is made of steel and provides sufficient weight and strength to enhance the drilling effect by hammering when inserting the probe rod 11. The hammer head 112 is fitted with a rubber protective layer to prevent damage to the probe rod 11 and the surrounding environment during construction. It also reduces noise and vibration caused by impact, which helps protect the soil moisture sensor 12 installed inside the probe rod 11. With this structure, the probe 11 has the following functional characteristics: First, high-efficiency penetration. The design of the cone head 111 allows it to be quickly and effectively inserted into different soil types, reducing construction time and improving work efficiency. Second, wear resistance. The tungsten carbide wear-resistant coating significantly improves the wear resistance of the cone head, enabling it to maintain good performance over long-term use and reducing replacement frequency. Third, safety. The design of the rubber protective layer not only protects the hammer and probe but also reduces potential harm to workers and equipment during construction, enhancing construction safety. Fourth, strong adaptability. The design of the cone head 111 and hammer head 112 of the probe 11 makes it adaptable to various soil conditions, including loose soil and clay, enabling it to work effectively in different environments.

[0031] In this embodiment, the probe 11 is configured as a telescopic adjustable structure, composed of multiple modular steel pipe sections connected by threads; that is, the probe 11 is composed of multiple steel pipe sections, each of which is fixed together by threaded connections. This design allows the length of the probe to be adjusted according to actual needs, adapting to soil monitoring requirements at different depths. Simultaneously, through the rotating steel pipe connections, construction personnel can easily adjust the length of the probe 11 to monitor soil moisture content and lateral pressure at different soil depths. This flexibility makes the device more adaptable and capable of handling various construction conditions. With this structure, the probe 11 has the following functional characteristics: First, it is easy to carry and transport. The modular design allows the probe to be disassembled into multiple short pipe sections, making it easy to carry and transport, and reducing space occupation during transportation. Second, it is convenient to install and disassemble. Due to the threaded connection, construction personnel can quickly and easily install and disassemble the probe without complicated tools and extra time, thus improving construction efficiency. Third, it is adaptable to various depths. The telescopic adjustment design allows the device to adjust the probe length according to specific construction needs, thereby effectively monitoring at different soil depths and ensuring accurate soil data. Fourth, it improves stability. The threaded connection of each steel pipe section provides good fixation, ensuring the stability of the probe during soil insertion and avoiding probe movement or deformation caused by soil pressure.

[0032] In this embodiment, the multi-section modular steel pipes of the probe rod 11 can be selected to have the same length for standardized production and operation; or the lengths can be different to adapt to the monitoring needs of different soil layers. For example, longer steel pipes can be used for deep soil monitoring, while shorter steel pipes can be used for shallow soil monitoring. Simultaneously, each section of modular steel pipe is equipped with at least one soil moisture sensor 12, the placement of which can be rationally arranged according to design requirements, ensuring that after the probe rod 11 is inserted into the soil, it can monitor the soil moisture content at different depths. Using this structure, the probe rod 11 has the following functional characteristics: First, it is flexible and adaptable, allowing for the selection of different length combinations of steel pipes according to specific construction needs, thereby achieving accurate monitoring of different soil depths; for complex geological conditions, the flexible length configuration allows the probe rod to better adapt to varying soil structures; second, it has multi-point monitoring capability, with each section of steel pipe equipped with a soil moisture sensor, enabling the device to perform multi-point monitoring at different depths, providing more comprehensive soil condition information. This design can effectively capture changes in soil moisture content, which helps construction personnel to conduct scientific analysis; thirdly, it improves monitoring accuracy. By setting multiple sensors at different depths, richer soil data can be obtained, reducing judgment bias caused by data from a single depth and improving monitoring accuracy; fourthly, it simplifies installation and operation. Since each section of steel pipe can be installed independently, construction personnel can quickly assemble or disassemble it as needed, simplifying the operation process and improving construction efficiency.

[0033] In this embodiment, a sensor array consisting of multiple soil moisture sensors 12 is arranged in a spiral pattern on the outer surface of the probe 11. This spiral arrangement allows the soil moisture sensors to form a larger contact area when inserted into the soil, improving the effectiveness of monitoring. Furthermore, the evenly spaced spacing of each soil moisture sensor 12 ensures that soil moisture data can be collected at different depths and locations after the probe 11 is inserted into the soil. This design facilitates the acquisition of comprehensive soil moisture distribution information. Adopting this structure, the device has the following functional characteristics: First, it improves monitoring coverage. The spiral arrangement allows the soil moisture sensors to cover a larger monitoring area within a certain depth range, thereby improving the accuracy and comprehensiveness of soil moisture measurement. Second, it optimizes data acquisition. Since each soil moisture sensor can collect data independently, the spiral layout allows soil conditions at different depths to be monitored simultaneously, thus obtaining richer soil information. Third, it enhances adaptability. The spiral design allows the probe to effectively cope with the lateral pressure of the soil when inserted, reducing the risk of damage to the soil moisture sensors during insertion and improving the overall stability of the probe. Fourth, it provides real-time feedback and analysis. All soil moisture sensors transmit the collected soil moisture data to the soil pressure calculation instrument, enabling real-time analysis of soil conditions and providing timely decision support for construction personnel.

[0034] In this embodiment, the borehole collapse monitoring device 1 also includes a magnetic base 15 disposed at the bottom of the earth pressure calculation instrument 14. The magnetic base 15 is used to attract the hammer head 112 of the probe rod 11. The magnetic base 15 uses a strong magnet, which can firmly fix the earth pressure calculation instrument 14 after the probe rod 11 is inserted into the soil, ensuring stable detection during the monitoring process. With this structure, the device has the following functional characteristics: First, enhanced stability. The design of the magnetic base 15 allows the earth pressure calculation instrument 14 to be tightly fixed on the hammer head 112 of the probe rod 11. This prevents the instrument from shifting due to vibration or external interference during soil monitoring, ensuring the stability and accuracy of data acquisition. Second, easy installation and disassembly. The application of the magnetic base allows the earth pressure calculation instrument 14 to be quickly connected and disconnected from the probe rod 11. Construction personnel can operate it without complicated tools, improving work efficiency. Third, improved portability. The design of the magnetic base 15 simplifies the connection method of the equipment, making the entire device more compact, easy to carry and transport, and suitable for rapid deployment in on-site construction. Fourth, flexible application. The magnetic base's adsorption design allows for flexible use in different construction scenarios, making it more adaptable and able to quickly adapt to monitoring needs under different depths and conditions.

[0035] In this embodiment, the earth pressure calculation instrument 14 includes a display module 141, a calculation module 142, a data / power transmission module 143, and a data input module 144. The display module 141 displays the dynamic curve of the active earth pressure (Pa) and safety threshold warning indicators in real time. Through a graphical interface, construction personnel can intuitively observe changes in soil pressure and promptly identify potential risks. The calculation module 142 receives data from various soil moisture sensors 12, analyzes and calculates it. It processes soil state information in real time, assesses soil stability, and performs calculations based on a set soil mechanics model, providing a scientific basis. The data / power transmission module 143 connects to the data / power transmission line 13, transmitting data from the soil moisture sensors 12 and other modules to the calculation module 142 and the data input module 144, ensuring reliable data transmission and power supply. The data input module 144 receives the processing results from the calculation module 142 and transmits them to the display module 141. It can also accept manual input from construction personnel, facilitating parameter setting or adjustment of monitoring requirements. Adopting this structure, the local soil pressure calculation instrument has the following functional characteristics: First, real-time monitoring and feedback: the display module provides dynamic curve display, allowing construction personnel to monitor soil pressure changes in real time, promptly detect anomalies, and take necessary preventive measures. Second, data processing and analysis: the calculation module can quickly analyze soil conditions and, combined with data from different sensors, conduct a comprehensive evaluation, improving the accuracy and reliability of monitoring. Third, early warning function: the safety threshold early warning indicator function can promptly issue an alarm when soil pressure exceeds the safe range, reminding construction personnel to take appropriate countermeasures and enhancing construction safety. Fourth, user-friendly interface: the display module provides an intuitive operating interface, simplifying the user process and allowing construction personnel to quickly understand the current soil conditions and monitoring results.

[0036] In this embodiment, the earth pressure calculation instrument 14 is equipped with one or more of the following functional interfaces: HDMI, USB, POWER, or WLAN. Users can connect to the earth pressure calculation instrument 14 via data cables with various interfaces and then export the data for other devices to obtain measurement data. With this structure, the earth pressure calculation instrument has the following functional characteristics: First, diversified data transmission methods: providing multiple interface options allows users to flexibly choose the data transmission method according to actual needs, meeting the connection requirements of different devices and improving the applicability of the equipment. Second, convenient data export: users can easily export measurement data for subsequent analysis and archiving. This function is particularly important for data organization and report generation, improving work efficiency. Third, improved on-site operational convenience: through HDMI and USB interfaces, users can quickly display and record data on-site, reducing reliance on traditional paper records and improving data processing efficiency. Fourth, support for remote monitoring: the WLAN interface design enables users to achieve remote monitoring and data sharing, facilitating information exchange among team members and enhancing collaborative work capabilities on the construction site.

[0037] When this portable pile foundation construction collapse monitoring device starts working, first place the collapse monitoring device 1 near the pile foundation 2 to ensure that the probe 11 can be effectively inserted into the soil for monitoring. Use the soil moisture sensor 12 in the probe 11 of the collapse monitoring device 1 to detect the moisture content of the surrounding soil in real time. This data is the basis for subsequent calculations. The unit weight γ of the soil is calculated by formula (3). Then, input the soil internal friction angle φ according to the local soil data, and calculate the active earth pressure coefficient K of the soil according to formula (2). a Then, the soil cohesion C value is automatically calculated based on the soil moisture content data; finally, the earth pressure calculation module 14 automatically calculates the active earth pressure P on the borehole wall of the pile foundation according to formula (1). a Meanwhile, the earth pressure calculation module 14 includes various soil shear strength indices. By inputting the soil type, the operator can automatically compare and provide the borehole wall condition of the pile foundation.

[0038]

[0039] Among them, P a --Active earth pressure (kPa), K a --Active earth pressure coefficient, γ--Soil unit weight kN / m 3 H -- Pile bottom depth (m), C -- Soil cohesion (kN / m) 3 L--Pile perimeter.

[0040]

[0041] Where φ is the internal friction angle of the soil.

[0042]

[0043] Among them, W w --Mass of a unit water-containing soil sample (kN), V--Volume of a unit soil sample (m³) 3 .

[0044] In this way, this borehole collapse monitoring device can mitigate the risk of borehole collapse during construction by timely monitoring the moisture content of the soil surrounding the pile foundation and simultaneously calculating the lateral earth pressure on the borehole wall. Furthermore, by detecting the earth pressure on the borehole wall, the speed of concrete pouring can be controlled, thereby shortening the pile foundation construction time, improving construction efficiency, and reducing construction costs. Therefore, this borehole collapse monitoring device is suitable for soils with significant periodic variations in moisture content, effectively monitoring soil moisture content to guide construction.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A portable pile foundation construction hole collapse monitoring device, characterized by, The borehole collapse monitoring device (1) is set close to the pile foundation (2) and consists of a probe (11), a soil moisture sensor (12), a data / power transmission line (13), and an earth pressure calculation instrument (14). Multiple soil moisture sensors (12) are set along the axial direction of the probe (11), and multiple soil moisture sensors (12) are electrically connected to the earth pressure calculation instrument (14) through the data / power transmission line (13) passing through the inside of the probe (11).

2. A portable pile foundation construction hole collapse monitoring device according to claim 1, characterised in that, The probe rod (11) has a cone head (111) and a hammer head (112) at both ends. The hammer head (112) is a steel hammer head with a rubber protective layer. The cone head is a high-strength metal drill bit with a tungsten carbide wear-resistant layer on its surface, a tip angle of 60°±5°, and a spiral groove.

3. A portable pile foundation construction collapse monitoring device according to claim 1 or 2, characterised in that, The probe (11) is configured as a telescopic adjustable structure, which is made of multiple modular steel pipes connected by threads.

4. A portable pile foundation construction collapse monitoring device according to claim 3, characterised in that, The multi-section modular steel pipe of the probe (11) has the same and / or different lengths, and each of the multi-section modular steel pipe of the probe (11) is provided with at least one of the soil moisture sensors (12).

5. A portable pile foundation construction collapse monitoring device according to claim 1, characterised in that, The sensor array consisting of multiple soil moisture sensors (12) is arranged in a spiral pattern on the outer surface of the probe (11).

6. A portable pile foundation construction collapse monitoring device according to claim 2, characterised in that, The borehole collapse monitoring device (1) also includes a magnetic base (15) set at the bottom of the earth pressure calculation instrument (14), which is used to attract the hammer head (112) of the probe (11).

7. A portable pile foundation construction collapse monitoring device according to claim 1, characterised in that, The earth pressure calculation instrument (14) includes a display module (141), a calculation module (142), a data / power transmission module (143), and a data input module (144). The data / power transmission module (143) is connected to the data / power transmission line (13) and the data input module (144). The data input module (144) is connected to the display module (141) and the calculation module (142) respectively. The calculation module (142) is connected to the display module (141). The display module (141) is used to display the dynamic curve of active earth pressure Pa and the safety threshold warning mark in real time.

8. A portable pile foundation construction collapse monitoring device according to claim 7, characterised in that, The earth pressure calculation instrument (14) is equipped with one or more of the following functional interfaces: HDMI, USB, POWER, or WLAN.

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