Pressure detection assembly for spiral plate load test

Abstract

The utility model discloses a pressure detection assembly for a spiral plate load test. The pressure detection assembly comprises a force transmission shaft, an outer sleeve and a spiral plate shaft. The force transmission shaft is designed to be of a hollow structure and is divided into an upper connecting part, a force transmission part, a pressure sensing part and a lower connecting part, and the pressure sensing part is provided with a resistance-type strain gauge to detect soil layer pressure. The force transmission part and the lower connecting part are provided with splines which are matched with spline grooves in the outer sleeve, and torsion transmission is achieved. The spiral plate shaft is connected with the lower end of the force transmission shaft through threads, and a deformation gap is reserved between an annular boss on the spiral plate shaft and the lower end of the outer sleeve so as to absorb deformation of the force transmission shaft. The spiral plate sleeve is detachably mounted on the spiral plate shaft, and the spiral plate is welded on the outer wall of the spiral plate sleeve. According to the assembly, the precision, the stability and the adaptability of a spiral plate load test are remarkably improved, and a foundation is provided for carrying out a multifunctional comprehensive test.

Description

Technical Field

[0001] This utility model belongs to the field of spiral plate load testing technology, and particularly relates to a pressure detection assembly for spiral plate load testing. Background Technology

[0002] In the field of civil engineering, accurate assessment of the bearing capacity and deformation characteristics of foundation soil is crucial to ensuring the safety and stability of buildings. Spiral plate load testing, as an efficient and reliable in-situ testing method, provides valuable data support for engineering design by simulating actual load conditions. However, traditional spiral plate load testing technology and its supporting equipment still have certain limitations in practical applications. Taking the rotating penetrometer probe with publication number CN200946264Y as an example, although this design integrates torque sensors, water pressure sensors, and pressure sensors, enabling multi-dimensional measurement of formation parameters, its structure is relatively complex, containing multiple components such as the push rod and the blind tube fitted onto the push rod. This not only increases manufacturing and maintenance costs but also may lead to a decrease in measurement accuracy due to friction, wear, or misalignment between components during actual operation. In particular, under varying geological conditions, the reliability of these delicate components faces challenges, potentially affecting the continuity and accuracy of data. Furthermore, the complex structure limits testing efficiency, especially when a large amount of data needs to be acquired quickly for formation profile analysis; the response speed and testing range of traditional probes may not meet the requirements for efficient operation. Therefore, simplifying the probe structure and improving testing efficiency and accuracy have become pressing issues in current spiral plate load testing technology. In light of this background, this invention proposes an improved spiral plate load testing probe design. By eliminating multiple components such as the top rod and the blind tube fitted onto the top rod, the pressure sensing element is directly integrated onto the force transmission shaft, thereby simplifying the probe structure, reducing manufacturing costs, and improving testing reliability and efficiency. This innovative design not only simplifies the testing process and reduces potential failure points but also improves measurement accuracy through a more direct pressure transmission path, providing more precise data support for assessing the bearing capacity and deformation characteristics of foundation soil. Utility Model Content

[0003] To address the problems existing in the prior art, this utility model provides a pressure detection assembly for spiral plate load testing.

[0004] This utility model is implemented as follows: a pressure detection assembly for spiral plate load testing, characterized in that: it includes a hollow force transmission shaft threadedly connected to a probe rod; the force transmission shaft includes an integrally formed upper connecting part, a force transmission part, a pressure sensing part, and a lower connecting part; the outer diameters of the force transmission part and the lower connecting part are smaller than the outer diameter of the upper connecting part; an upper limit platform is formed at the connection between the force transmission part and the upper connecting part; the outer diameter of the pressure sensing part is smaller than the outer diameters of the force transmission part and the lower connecting part; the pressure sensing part is provided with a resistive strain gauge for checking soil pressure; the resistive strain gauge is electrically connected to an external pressure acquisition device; the force transmission part and the lower connecting part are provided with splines for transmitting rotational torque; the force transmission part of the force transmission shaft... The pressure sensing part and the lower connecting part are all fitted with an outer sleeve; the outer sleeve has a spline groove that mates with a spline; the lower end of the lower connecting part is threadedly connected to a spiral plate shaft; the spiral plate shaft includes a force transmission shaft connecting part and a spiral plate sleeve connecting part, and an annular boss with an outer diameter larger than the outer diameter of the force transmission shaft connecting part and the spiral plate sleeve connecting part is provided between the force transmission shaft connecting part and the spiral plate sleeve connecting part; a spiral plate sleeve is detachably fitted onto the spiral plate sleeve connecting part, and a spiral plate is welded to the outer wall of the spiral plate sleeve; after the lower connecting part and the spiral plate shaft are threadedly connected, at least between the lower end of the outer sleeve and the upper end face of the annular boss of the spiral plate shaft, there is a deformation gap to absorb the deformation of the lower connecting part driven by the spiral plate shaft to the force transmission shaft.

[0005] Preferably, the wall thickness of the pressure sensing part is 3~4mm.

[0006] Preferably, a clamping part is provided on the outer wall of the upper connecting part of the force transmission shaft.

[0007] Preferably, a flexible support pad is provided between the upper end face of the outer jacket and the lower surface of the upper limit platform, and between the lower end face of the outer jacket and the upper end face of the annular boss of the spiral plate shaft.

[0008] Preferably, an O-ring is provided between the outer sleeve and the force transmission part and the lower connecting part of the force transmission shaft.

[0009] Preferably, the spiral plate sleeve connecting part is provided with a spline, the spiral plate sleeve is provided with a spline groove that mates with the spline, and a damping ring is provided between the upper end of the spiral plate sleeve and the spiral plate sleeve connecting part to prevent the spiral plate sleeve from slipping off under its own weight.

[0010] Preferably, the outer wall of the bolt plate shaft annular limiting platform is provided with a clamping part.

[0011] Preferably, a pore water pressure detection component is installed at the lower end of the spiral plate shaft for detecting pore water pressure in the soil layer. Preferably, the pore water pressure detection component includes a cone head threadedly connected to a pore water pressure detection chamber at the lower end of the spiral plate shaft. An inlet is provided on the outer circumference of the cone head, and the inlet connects to the pore water pressure detection chamber via an inlet channel. A water pressure sensor is installed inside the pore water pressure detection chamber, and the water pressure sensor is electrically connected to a pressure acquisition device.

[0012] Preferably, the water inlets are located on the same circumference, and a filter ring is installed on the circumferential surface of the water inlets.

[0013] Advantages and technical effects of this utility model:

[0014] The technical effects of this utility model are mainly reflected in the following aspects:

[0015] Simplified Structure and Enhanced Accuracy: By adopting an integrated force transmission shaft design, this invention significantly simplifies the structure, reduces interfaces between components and potential failure points, thereby improving the reliability and durability of the test. Compared with existing technologies, this integrated design not only enhances the rigidity and stability of the overall structure but also shortens the pressure transmission path, enabling soil pressure to be transmitted more directly and accurately to the measuring element, thus improving the accuracy and stability of the measurement.

[0016] Optimized Pressure Sensing Design: As a key component of this invention, the pressure sensing unit is designed with sensitivity and accuracy in mind. By placing it below the limiting platform formed by the upper connecting part and reducing its outer diameter, the pressure sensing becomes more sensitive, enabling more accurate capture of changes in soil pressure. Enhanced Adaptability and Durability: This invention employs optimized designs in several key areas, such as flexible support pads, O-ring seals, and spline connections. These designs not only enhance the sealing performance and stability of the structure but also improve the adaptability and durability of the equipment. Especially under complex geological conditions, these designs effectively reduce wear and energy loss, ensuring long-term stable operation of the equipment.

[0017] Enhanced Comprehensive Measurement Capabilities: By introducing a pore water pressure detection component, this invention achieves simultaneous and accurate detection of pore water pressure within soil layers. This innovative design not only enriches the data dimensions of the experiment but also provides crucial data support for analyzing the consolidation characteristics and permeability of soil layers, as well as assessing foundation stability. Simultaneously, the filter ring design further improves the accuracy of pore water pressure measurement, enhancing the adaptability and repeatability of the experiment.

[0018] Ease of operation and reliability of connection: This invention features clamping parts on the upper connecting part of the force transmission shaft and the annular limiting platform of the spiral plate shaft. This design simplifies the installation and disassembly process, ensures stable clamping, and effectively improves the ease of operation and the reliability of connection. This design not only reduces the difficulty of operation but also improves work efficiency.

[0019] In summary, this invention, through a series of optimized designs, significantly improves the accuracy, stability, and adaptability of spiral plate load tests, providing a more scientific and reliable basis for decision-making in civil engineering fields such as foundation bearing capacity assessment, foundation treatment, pile foundation design, and underground space development. Simultaneously, the comprehensive measurement capabilities of this invention provide researchers with more comprehensive data for soil layer characteristic analysis, promoting technological progress and development in the field of civil engineering. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model;

[0021] Figure 2 This is a three-dimensional structural diagram of Embodiment 1 of this utility model;

[0022] Figure 3 This is a schematic diagram of the force transmission shaft structure;

[0023] Figure 4 This is a schematic diagram of the internal structure of the force transmission shaft;

[0024] Figure 5 This is a schematic diagram of the outer garment structure;

[0025] Figure 6 This is a schematic diagram of the structure of Example 2;

[0026] Figure 7 This is a schematic diagram of the spiral plate shaft structure;

[0027] Figure 8 This is a schematic diagram of the internal structure of the spiral plate shaft;

[0028] Figure 9 This is a schematic diagram of a cone-shaped structure.

[0029] In the diagram: 1. Force transmission shaft; 1-1. Upper connecting part; 1-2. Force transmission part; 1-3. Pressure sensing part; 1-4. Lower connecting part; 1-5. Upper limit platform; 1-6. Resistance strain gauge; 1-7. Spline; 1-8. Clamping part; 2. Outer sleeve; 2-1. Spline groove; 3. Spiral plate shaft; 3-1. Force transmission shaft connecting part; 3-2. Spiral plate sleeve connecting part; 3-20. Spline; 3-3. Annular boss; 3-30. Clamping part; 4. Spiral plate sleeve; 4-1. Spline groove; 5. Spiral plate; 6. Flexible support pad; 7. O-ring seal; 8. Damping ring; 9. Pore water pressure detection assembly; 9-1. Cone head; 9-2. Pore water pressure detection chamber; 9-3. Inlet; 9-4. Water pressure sensor; 10. Filter ring. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0031] Please see Figures 1 to 5A pressure detection assembly for spiral plate load testing includes a hollow force transmission shaft 1 threadedly connected to a probe. The force transmission shaft comprises an integrally formed upper connecting part 1-1, a force transmission part 1-2, a pressure sensing part 1-3, and a lower connecting part 1-4. The integrated design of the upper connecting part, force transmission part, pressure sensing part, and lower connecting part enhances the rigidity and stability of the overall structure, reduces interfaces and potential failure points between components, and improves the reliability and durability of the test. Compared with existing technologies, the assembly of components such as the push rod and blind tube increases structural complexity, and the coaxiality, friction, and wear between components may affect measurement accuracy. The integrated design of this invention simplifies the structure and improves the stability and accuracy of the measurement. The outer diameters of the force transmission part and the lower connecting part are smaller than the outer diameter of the upper connecting part, forming an upper limit platform 1-5. The pressure sensing part is located between the force transmission part and the lower connecting part, and its outer diameter is smaller than that of the force transmission part and the lower connecting part; this makes the pressure sensing more sensitive and able to more accurately capture changes in soil pressure. The pressure sensing part is equipped with a resistance strain gauge 1-6 for checking soil pressure, and the resistance strain gauge is electrically connected to an external pressure acquisition device; the force transmission part and the lower connecting part are equipped with splines 1-7 for transmitting rotational torque; the force transmission part, pressure sensing part and lower connecting part of the force transmission shaft are fitted with an outer sleeve 2; the inner sleeve is provided with a spline groove 2-1 that mates with the splines; the splines on the force transmission part and the lower connecting part mate with the spline groove in the outer sleeve, so that the force transmission part can effectively transmit rotational torque to the lower connecting part through the outer sleeve, reducing the torque transmitted by the pressure sensing part, protecting the thin-walled pressure sensing part, and ensuring the coaxiality and stability between the force transmission shaft and the outer sleeve. The lower end of the lower connecting part is threadedly connected to a spiral plate shaft 3. The spiral plate shaft includes a force transmission shaft connecting part 3-1 and a spiral plate sleeve connecting part 3-2. An annular boss 3-3 with an outer diameter larger than the outer diameters of the force transmission shaft connecting part and the spiral plate sleeve connecting part is provided between the force transmission shaft connecting part and the spiral plate sleeve connecting part. The design of the annular boss enhances the strength of the spiral plate shaft and provides positioning support for the installation of the spiral plate sleeve. A spiral plate sleeve 4 is detachably fitted onto the spiral plate sleeve connecting part. A spiral plate 5 is welded to the outer wall of the spiral plate sleeve. After the lower connecting part of the force transmission shaft is threadedly connected to the spiral plate shaft, a deformation gap H is provided at least between the lower end of the outer sleeve and the upper end face of the annular boss of the spiral plate shaft. This gap is used to absorb the deformation of the lower connecting part, pressure sensing part, and force transmission part of the force transmission shaft driven by the spiral plate shaft, so that the outer sleeve does not affect the axial force on the force transmission shaft.

[0032] Preferably, the wall thickness of the pressure sensing element is generally 3-4 mm. The specific value for the wall thickness of the pressure sensing element usually needs to be determined based on actual design requirements, material properties, and the expected pressure, therefore there is no fixed range applicable to all situations. However, in helical load tests, when a hollow force transmission shaft is used to collect soil pressure, the wall thickness of the pressure sensing element will significantly affect its technical effectiveness.

[0033] Generally, pressure sensing elements should have sufficient wall thickness to ensure their strength and stiffness, enabling them to accurately and stably sense and transmit soil pressure signals. Thicker walls typically provide better structural support and compressive strength, but may also increase the overall weight and cost of the force transmission shaft. Conversely, thinner walls, while reducing weight and cost, may require more advanced materials or reinforced structural designs to ensure strength and durability.

[0034] Preferably, the outer wall of the upper connecting part of the force transmission shaft is provided with a clamping part 1-8. This simplifies the installation and disassembly process, ensures stable clamping, and effectively improves the ease of operation and connection reliability.

[0035] Preferably, a flexible support pad 6 is provided between the upper end face of the outer sleeve and the lower surface of the upper limit platform, and / or between the lower end face of the outer sleeve and the upper end face of the annular boss of the spiral plate shaft. The flexible support pad 6, made of flexible materials such as rubber, polyurethane, or highly elastic silicone, not only effectively supports the weight of the spiral outer sleeve and maintains structural stability, but also deforms flexibly under soil pressure with minimal deformation resistance, making its impact on soil pressure negligible. This design ensures a tight fit between the outer sleeve and the limit platform or annular boss, while avoiding soil stress concentration caused by rigid support, thereby improving the adaptability and durability of the overall structure and ensuring the stable working performance of the spiral plate shaft and outer sleeve under complex geological conditions.

[0036] Preferably, an O-ring 7 is provided between the outer sleeve and the force transmission part and lower connecting part of the force transmission shaft. This not only significantly enhances the sealing performance of the structure, effectively preventing soil, moisture and other impurities from entering the internal mechanical structure, but also ensures a tight fit between the force transmission components through its good elasticity and resilience, reducing wear and energy loss, thereby greatly improving the overall reliability and service life of the equipment.

[0037] Preferably, the spiral plate sleeve connecting part 3-2 is provided with a spline 3-20, and the spiral plate sleeve 4 is provided with a spline groove 4-1 that mates with the spline. This design not only ensures a stable connection between the spiral plate sleeve and the connecting part, but also effectively transmits torque and axial force, improving the accuracy and stability of the load test. Simultaneously, a damping ring 8 is provided between the upper end of the spiral plate sleeve and the connecting part to prevent the spiral plate sleeve from slipping off under its own weight. With its good elasticity and friction, it effectively prevents accidental slippage of the spiral plate sleeve under its own weight or test load, further enhancing the structural safety. This comprehensive design enables spiral plate load tests to be conducted more reliably, ensuring the accuracy and repeatability of test results even under complex or extreme test conditions, providing strong technical support for foundation bearing capacity assessment in the field of civil engineering.

[0038] Preferably, the outer wall of the bolt plate shaft annular limiting platform is provided with a clamping part 3-30; this simplifies the installation and disassembly process, ensures stable clamping, and effectively improves the ease of operation and connection reliability.

[0039] Example 2, please refer to Figures 6 to 9 Based on the spiral plate load test, by preferably installing a pore water pressure detection component 9 at the lower end of the spiral plate shaft 3, the synchronous and accurate detection of pore water pressure in the soil layer was achieved. This innovative design not only enriches the data dimensions of the experiment, enabling researchers to more comprehensively understand the water pressure change characteristics of the soil layer during the stress process, but also provides key data support for analyzing the consolidation characteristics and permeability of the soil layer and assessing the stability of the foundation.

[0040] Specifically, the cone head 9-1 of the pore water pressure detection component 9 is threadedly connected to the pore water pressure detection chamber 9-2 at the lower end of the spiral plate shaft, ensuring both a secure connection and ease of disassembly and maintenance. The inlet 9-3 on the outer circumference of the cone head is cleverly designed to ensure smooth entry of pore water from the soil into the inlet channel and into the pore water pressure detection chamber. The high-precision water pressure sensor 9-4 installed inside the chamber can sense and measure changes in pore water pressure in real time, and is electrically connected to a pressure acquisition device for immediate data recording and analysis.

[0041] The introduction of this comprehensive measurement technology not only enhances the research value and application scope of spiral plate load testing, but also provides a more scientific and reliable basis for decision-making in civil engineering fields such as foundation treatment, pile foundation design, and underground space development. By comprehensively analyzing data on soil pressure and pore water pressure, researchers can more accurately assess the bearing capacity and deformation characteristics of soil layers, providing strong support for the safe construction and long-term stable operation of engineering projects.

[0042] Preferably, the water inlets are located on the same circumference, and filter rings 10 are installed on the circumferential surface of the water inlets. This ingenious design greatly improves the accuracy and reliability of the test. The evenly distributed water inlets ensure uniform inflow of pore water, while the filter rings effectively block impurities, protecting the water pressure sensor from clogging and damage, thereby improving the accuracy of pore water pressure measurement. In addition, this design enhances the adaptability and repeatability of the test, enabling stable and reliable data to be obtained even under complex geological conditions. This innovation not only optimizes the test process and reduces maintenance costs, but also provides a more scientific and comprehensive basis for soil layer characteristic analysis in the field of civil engineering.

[0043] During the spiral plate load test, the working pressure detection assembly of this invention plays a crucial role. The following is a detailed description of the working process and force transmission path:

[0044] 1. Preparation stage:

[0045] Connect the test probe to the probe rod and thread the cable through the probe rod. Rotate the probe rod manually or mechanically to lower the entire probe (including the force transmission shaft, outer sleeve, and spiral plate shaft) to the predetermined test depth in the formation. During this process, the upper connection of the force transmission shaft is subjected to rotational torque, which is transmitted to the lower connection through the spline connection between the force transmission shaft and the outer sleeve, thereby driving the spiral plate shaft and spiral plate to press down.

[0046] 2. Installation and Testing Preparation:

[0047] Install reaction force, pressurization devices and settlement monitoring devices to prepare for subsequent loading and monitoring.

[0048] Connect the test pressure and pore water pressure cables to the main test control instrument to ensure real-time data acquisition and recording.

[0049] 3. Loading and Observation:

[0050] The spiral bearing plate is loaded according to the expected loading level and loading standard using a probe. During the loading process, the soil pressure first acts on the spiral plate, and then is transmitted to the spiral plate shaft through the spiral plate sleeve connection, and then to the pressure sensing part of the force transmission shaft.

[0051] The resistive strain gauge on the pressure sensing unit senses changes in soil pressure and converts them into electrical signals, which are then transmitted to external pressure acquisition equipment via cables inside the force transmission shaft.

[0052] At the same time, the pore water pressure detection component also starts working, collecting pore water in the soil layer through the water inlet and filter ring on the cone head, and the water pressure sensor measures the changes in pore water pressure in real time.

[0053] 4. Force transmission and data recording:

[0054] Soil pressure is transmitted through the pressure sensing unit of the spiral plate, spiral plate shaft, and force transmission shaft to the test control instrument, forming a complete force transmission path.

[0055] At each loading level, the load was maintained for a certain period of time, while simultaneously recording the settlement displacement of the helical bearing plate and the pore water pressure values. These data provide important information for analyzing the bearing capacity and deformation characteristics of the soil layer.

[0056] 5. End of Experiment and Subsequent Operations:

[0057] Based on the settlement stability standard or observation time standard, apply the next level of load in a timely manner and continue to record data.

[0058] The load test at that depth ends when soil failure is reached or all predetermined loading levels are completed.

[0059] 6. To conclude the spiral plate load test for this borehole, disconnect the cable connecting the main control instrument, as well as the reaction force, pressurization, and settlement observation devices. Then, sequentially lift and disassemble the probe rod until the probe is removed. Initially, when lifting the probe rod, the spiral plate sleeve should detach from the spiral plate shaft and remain in the formation at the test depth.

[0060] 9. Remove the pore water pressure detection assembly, clean the water passage and filter ring, and reinstall it; if the damping ring is damaged, replace it in time, and then put a new spiral plate sleeve with a spiral plate on the spiral plate shaft for use in the next test.

[0061] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pressure detection assembly for spiral plate load testing, characterized in that: The device includes a hollow force-transmitting shaft that is threadedly connected to a probe rod. The force-transmitting shaft comprises an integrally formed upper connecting part, a force-transmitting part, a pressure-sensing part, and a lower connecting part. The outer diameters of the force-transmitting part and the lower connecting part are smaller than the outer diameter of the upper connecting part. An upper limit platform is formed at the connection between the force-transmitting part and the upper connecting part. The outer diameter of the pressure-sensing part is smaller than the outer diameters of the force-transmitting part and the lower connecting part. The pressure-sensing part is equipped with a resistance strain gauge for checking soil pressure, and the resistance strain gauge is electrically connected to an external pressure acquisition device. The force-transmitting part and the lower connecting part are equipped with splines for transmitting rotational torque. The force transmission part, pressure sensing part and lower connecting part of the force transmission shaft are all fitted with an outer sleeve; the outer sleeve is provided with a spline groove that mates with the spline on the force transmission shaft. The lower end of the lower connecting part is threadedly connected to a spiral plate shaft; the spiral plate shaft includes a force transmission shaft connecting part and a spiral plate sleeve connecting part, and an annular boss with an outer diameter larger than the outer diameter of the force transmission shaft lower connecting part and the spiral plate sleeve connecting part is provided between the force transmission shaft connecting part and the spiral plate sleeve connecting part; a spiral plate sleeve is detachably fitted on the spiral plate sleeve connecting part, and a spiral plate is welded to the outer wall of the spiral plate sleeve. After the lower connecting part is threadedly connected to the spiral plate shaft, a deformation gap is provided at least between the lower end of the outer sleeve and the upper end face of the annular boss of the spiral plate shaft, which is used to absorb the deformation of the force transmission shaft driven by the spiral plate shaft.

2. The pressure detection assembly for spiral plate load testing according to claim 1, characterized in that: The wall thickness of the pressure sensing element is 3~4mm.

3. The pressure detection assembly for spiral plate load testing according to claim 1, characterized in that: A clamping part is provided on the outer wall of the upper connecting part of the force transmission shaft.

4. The pressure detection assembly for spiral plate load testing according to claim 1, characterized in that: Flexible support pads are provided between the upper end face of the outer jacket and the lower surface of the upper limit station, and between the lower end face of the outer jacket and the upper end face of the annular boss of the spiral plate shaft.

5. The pressure detection assembly for spiral plate load testing according to claim 1, characterized in that: An O-ring is provided between the outer sleeve and the force transmission part and the lower connecting part of the force transmission shaft.

6. The pressure detection assembly for spiral plate load testing according to claim 1, characterized in that: The spiral plate sleeve connecting part is provided with a spline, the spiral plate sleeve is provided with a spline groove that mates with the spline, and the upper and lower ends of the spiral plate sleeve are provided with damping rings between the spiral plate sleeve connecting part and the spiral plate sleeve to prevent the spiral plate sleeve from slipping off under its own weight.

7. The pressure detection assembly for spiral plate load testing according to claim 1, characterized in that: The outer wall of the spiral plate shaft annular limiting platform is provided with a clamping part.

8. The pressure detection assembly for spiral plate load testing according to claim 1, characterized in that: The lower end of the spiral plate shaft is equipped with a pore water pressure detection component for detecting the pore water pressure in the soil layer.

9. The pressure detection assembly for spiral plate load testing according to claim 8, characterized in that: The pore water pressure detection assembly includes a cone head, which is threadedly connected to the pore water pressure detection cavity at the lower end of the spiral plate shaft. The outer circumference of the cone head is provided with a water inlet, which is connected to the pore water pressure detection cavity through a water inlet channel. A water pressure sensor is installed inside the pore water pressure detection cavity, and the water pressure sensor is electrically connected to a pressure acquisition device.

10. The pressure detection assembly for spiral plate load testing according to claim 9, characterized in that: The water inlets are located on the same circumference, and a filter ring is installed on the circumferential surface of the water inlet.

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