Super soft soil penetration ball instrument

Abstract

The utility model discloses a kind of super-soft soil penetration spherical instruments, including pedestal, force link, strain sensor and spherical probe, spherical probe has cavity, cavity is equipped with internal thread hole, the upper portion of force link is connected with pedestal, strain sensor is equipped in the lower portion of force link, the bottom end of force link is equipped with bolt column, the lower portion of force link is placed in cavity, and bolt column is screwed into internal thread hole to make force link and spherical probe fixed, aviation plug is inserted into pedestal, the cable of aviation plug is sequentially passed through pedestal, force link and is connected with strain sensor.The strain sensor is arranged in the inside of spherical probe, when force link and spherical probe are connected into an organic whole, the penetration resistance received by spherical probe can be directly transmitted to strain sensor by the bolt column of the bottom end of force link, improve the overall measurement accuracy of spherical instrument, and strain sensor is located in the inside of spherical probe, shorten the transmission path of penetration resistance, effectively improve the stability of spherical instrument.

Description

Technical Field

[0001] This utility model belongs to the field of marine geological exploration technology, and specifically relates to a penetrating sphere instrument for ultra-soft soil. Background Technology

[0002] Large-scale infrastructure projects such as offshore oil and gas platforms, wind farms, and subsea pipelines require construction on stable seabed foundations. Seabed surface soil, characterized by high water content and low shear strength, falls into the category of ultrasoft soil. Due to its extremely low bearing capacity and high compressibility, ultrasoft soil can cause settlement or instability of offshore infrastructure under heavy loads. Testing penetration resistance can accurately assess the soil's bearing capacity, providing crucial information for infrastructure design and construction, and ensuring its long-term safety.

[0003] Compared with traditional ultra-soft soil penetration resistance testing devices, the spherical probe has a larger force-bearing area and is less affected by overlying soil pressure and soil stiffness during penetration. It can distribute the contact pressure between the probe and the soil more evenly, reducing stress concentration problems. This makes the spherical probe more sensitive, the test data more stable, and it does not require stress correction, making it particularly suitable for high-precision testing in ultra-soft soil areas.

[0004] However, in most spherical probes, the penetration resistance measuring device is mounted on both sides of the dowel bar. This causes the lateral friction force generated by the interaction between the soil and the dowel bar during penetration to affect the measurement accuracy. Furthermore, the relatively large distance between the measuring device and the probe reduces the overall stability of the spherical probe, affecting its reliability and testing accuracy in practical applications. Utility Model Content

[0005] The purpose of this invention is to provide a spherical penetrator for ultra-soft soil, so as to solve the problems of reduced overall measurement accuracy and poor stability caused by side friction interference and excessively long penetration resistance transmission paths in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A spherical penetrator for ultra-soft soil includes an aviation plug, a base, a force transmission rod, a strain gauge sensor, and a spherical probe. The spherical probe has a cavity with an internally threaded hole. The upper part of the force transmission rod is connected to the base, and the strain gauge sensor is located at the lower part of the force transmission rod. A bolt post is provided at the bottom end of the force transmission rod. The lower part of the force transmission rod is placed in the cavity, and the bolt post is screwed into the internally threaded hole to fix the force transmission rod and the spherical probe. The aviation plug is inserted into the base, and the cable of the aviation plug passes through the base, the force transmission rod, and the strain gauge sensor in sequence.

[0008] Furthermore, the strain gauge sensor includes a first strain gauge group and a second strain gauge group, each with two strain gauges, which are attached to the lower outer wall of the force transmission rod. The strain gauges in the first strain gauge group and the second strain gauge group are attached symmetrically, and their strain directions are opposite.

[0009] Furthermore, both the base and the force transmission rod are hollow structures. The lower outer wall of the force transmission rod has through holes on both sides that are symmetrically connected to the hollow part of the force transmission rod, for passing through the cables of the aviation plug.

[0010] Furthermore, the surface of the spherical probe undergoes a light sandblasting treatment.

[0011] Furthermore, the spherical probe has a diameter of 40mm and a projected area of ​​1250mm². 2 The roughness of the spherical probe is 0.5 μm.

[0012] Furthermore, the top of the base is provided with base screw holes, which are internally threaded, for connecting the loading device.

[0013] Furthermore, the aviation plug is inserted from the side of the base.

[0014] Furthermore, the cross-sectional area at the bottom of the force transmission rod is larger than that at the top.

[0015] Furthermore, the length of the force transmission rod is 500mm, the top cross-sectional diameter is 10mm, and the bottom cross-sectional diameter is 14mm.

[0016] Furthermore, a groove is provided at the lower part of the force transmission rod for placing a sealing ring.

[0017] In summary, this utility model has at least one of the following beneficial effects:

[0018] This invention proposes a spherical penetration tester for ultra-soft soil. A strain gauge sensor is placed inside the spherical probe. When the force transmission rod is integrated with the spherical probe, the penetration resistance experienced by the spherical probe can be directly transmitted to the strain gauge sensor through the bolt at the bottom of the force transmission rod. This design eliminates the lateral friction caused by the interaction between the soil and the two sides of the force transmission rod during conventional spherical penetration resistance testing of ultra-soft soil, thus improving the overall measurement accuracy of the spherical tester. Furthermore, the strain gauge sensor's location inside the spherical probe shortens the transmission path of the penetration resistance, effectively improving the stability of the spherical tester. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A cross-sectional schematic diagram of the ultra-soft soil penetration sphere apparatus provided for an embodiment of this utility model;

[0021] Figure 2 A schematic diagram of the spherical probe of the ultra-soft soil penetration spherical instrument provided in this embodiment of the utility model;

[0022] Figure 3 A three-dimensional overall schematic diagram of the ultra-soft soil penetration sphere apparatus provided for an embodiment of this utility model;

[0023] Figure 4 This is a three-dimensional exploded view of the ultra-soft soil penetration sphere apparatus provided in an embodiment of the present invention.

[0024] The markings in the diagram are as follows: 1. Base screw hole; 2. Aviation plug; 3. Base; 4. Force transmission rod; 5. Cable; 6. Sealing ring; 7. First strain gauge group; 8. Spherical probe; 9. Second strain gauge group; 10. Internal threaded hole; 11. Bolt post; 12. Groove; 13. Cavity. Detailed Implementation

[0025] The following is in conjunction with the appendix Figures 1-4 The present invention will be described in further detail below.

[0026] Please refer to the attached diagram in the instruction manual. Figure 1-4 The present invention provides an embodiment of a spherical penetrator for ultra-soft soil, comprising an aviation plug 2, a base 3, a force transmission rod 4, a strain gauge sensor, and a spherical probe 8. The spherical probe 8 has a cavity 13, and an internal threaded hole 10 is provided in the cavity 13. The upper part of the force transmission rod 4 is connected to the base 3, and the strain gauge sensor is located at the lower part of the force transmission rod 4. A bolt post 11 is provided at the bottom end of the force transmission rod 4. The lower part of the force transmission rod 4 is placed in the cavity 13, and the bolt post 11 is screwed into the internal threaded hole 10 to fix the force transmission rod 4 and the spherical probe 8. The aviation plug 2 is inserted into the base 3, and the cable 5 of the aviation plug 2 passes through the base 3 and the force transmission rod 4 in sequence and is connected to the strain gauge sensor.

[0027] The aviation connector 2 connects to the signal receiver and power supply, transmitting the measured values ​​from the strain gauge sensor to the signal receiver and supplying voltage to the strain gauge sensor. The strain gauge sensor, located at the bottom of the force transmission rod 4, is placed within the cavity 13 of the spherical probe 8. The bolt post 11 of the force transmission rod 4 is screwed into the internal threaded hole 10 of the cavity 13. The penetration resistance experienced by the spherical probe 8 is directly transmitted to the strain gauge sensor through the bolt post 11 at the bottom of the force transmission rod 4, and the electrical signal from the strain gauge sensor is transmitted to the aviation connector 2, which then transmits it to the signal receiver to calculate the magnitude of the penetration resistance. The strain gauge sensor's location inside the spherical probe 8 shortens the transmission path of the penetration resistance, effectively improving the stability of the spherical probe.

[0028] In some embodiments, such as Figure 1 As shown, the strain gauge sensor includes a first strain gauge group 7 and a second strain gauge group 9. Each of the first strain gauge group 7 and the second strain gauge group 9 has two strain gauges, which are attached to the lower outer wall of the force transmission rod 4. The strain gauges in the first strain gauge group 7 and the second strain gauge group 9 are attached in symmetrical positions and have opposite strain directions.

[0029] In some embodiments, such as Figure 1 As shown, aviation connector 2 uses a 4-pin interface.

[0030] In some embodiments, such as Figure 1 and Figure 2 As shown, both the base 3 and the force transmission rod 4 are hollow structures. The lower outer wall of the force transmission rod 4 has through holes on both sides that are symmetrically connected to the hollow part of the force transmission rod 4. These holes are used to pass through the cable 5 of the aviation plug 2. The cable 5 extends from the aviation plug 2 and passes through the hollow parts of the base 3 and the force transmission rod 4, and through the two through holes on the lower outer wall of the force transmission rod 4, and connects to the first strain gauge group 7 and the second strain gauge group 9.

[0031] In some embodiments, the first strain gauge group 7 and the second strain gauge group 9 are connected by a Wheatstone circuit. The Wheatstone circuit adopts a full-bridge configuration, with strain gauges installed in all four bridge arms. It has good temperature compensation characteristics. When the spherical probe 8 is subjected to resistance, the strain gauges deform and their resistance values ​​change, causing the bridge to become unbalanced. This results in an output voltage on the diagonal of the bridge. The output voltage is transmitted to the signal receiving device through the cable 5 and the aviation plug 2, and then the magnitude of the penetration resistance is calculated.

[0032] In some embodiments, the first strain gauge group 7 and the second strain gauge group 9 are waterproofed, specifically by sealing all strain gauge sensors and cable 5 inlets with electronic potting compound to improve their service life.

[0033] In some embodiments, the cable 5 adopts a 6-core structure, wherein 2 cores are used to supply power to the first strain gauge group 7 and the second strain gauge group 9, 2 cores are connected to the first strain gauge group 7, and 2 cores are connected to the second strain gauge group 9.

[0034] In some embodiments, the surface of the spherical probe 8 is lightly sandblasted to improve surface quality and increase roughness, thereby enabling it to make full contact with the surrounding soil.

[0035] In some embodiments, the diameter of the spherical probe 8 is 40 mm, and the projected area is 1250 mm². 2 The roughness of the spherical probe is 0.5 μm.

[0036] In some embodiments, such as Figure 1 As shown, the base 3 has a base screw hole 1 at its top, which is an internal thread, for connecting the loading device and transmitting the force applied by the loading device to the force transmission rod 4.

[0037] In some embodiments, such as Figure 1 As shown, the aviation plug 2 is inserted from the side of the base 3, which provides an environment for the aviation plug 2 to be installed.

[0038] In some embodiments, the base 3 has a total length of 90 mm, a top cross-sectional diameter of 20 mm, and a bottom cross-sectional diameter of 16 mm.

[0039] In some embodiments, the upper part of the force transmission rod 4 is fixedly connected to the base 3.

[0040] In some embodiments, such as Figure 4 As shown, the bottom cross-sectional area of ​​the force transmission rod 4 is larger than the top cross-sectional area. The transition method of the force transmission rod 4 with different cross-sectional areas adopts a streamlined transition design, which can reduce the impact of the overburden pressure on the test accuracy.

[0041] In some embodiments, the force transmission rod 4 has a length of 500 mm, a top cross-sectional diameter of 10 mm, and a bottom cross-sectional diameter of 14 mm.

[0042] In some embodiments, such as Figure 4 As shown, the lower part of the force transmission rod 4 is provided with a groove 12 for placing the sealing ring 6, which is built into the cavity 13. The sealing ring 6 can prevent soil and moisture from entering the spherical probe 8 and interfering with the accuracy of the test data, and has a sealing and waterproof function.

[0043] In some embodiments, the sealing ring 6 is an elastic silicone ring. The outer periphery of the sealing ring 6 can abut against the inner wall of the spherical probe 8 to prevent soil and moisture from entering the spherical probe 8 and interfering with the accuracy of the test data.

[0044] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A spherical penetrator for ultra-soft soil, characterized in that: The device includes an aviation connector, a base, a force transmission rod, a strain gauge sensor, and a spherical probe. The spherical probe has a cavity with an internal threaded hole. The upper part of the force transmission rod is connected to the base, and the strain gauge sensor is located at the lower part of the force transmission rod. A bolt post is located at the bottom of the force transmission rod. The lower part of the force transmission rod is placed in the cavity, and the bolt post is screwed into the internal threaded hole to fix the force transmission rod and the spherical probe. The aviation connector is inserted into the base, and the cable of the aviation connector passes through the base, the force transmission rod, and connects to the strain gauge sensor in sequence.

2. The ultra-soft soil penetration sphere apparatus according to claim 1, characterized in that: The strain gauge sensor includes a first strain gauge group and a second strain gauge group. Each of the first strain gauge group and the second strain gauge group has two strain gauges, which are attached to the lower outer wall of the force transmission rod. The strain gauges in the first strain gauge group and the second strain gauge group are attached symmetrically and in opposite directions.

3. The ultra-soft soil penetration sphere apparatus according to claim 1, characterized in that: Both the base and the force transmission rod are hollow structures. The lower outer wall of the force transmission rod has symmetrical through holes on both sides that communicate with the hollow part of the force transmission rod, which are used to pass through the cables of the aviation plug.

4. The ultra-soft soil penetration sphere apparatus according to claim 1, characterized in that: The surface of the spherical probe has been lightly sandblasted.

5. The ultra-soft soil penetration sphere apparatus according to claim 4, characterized in that: The spherical probe has a diameter of 40mm and a projected area of ​​1250mm². 2 The roughness of the spherical probe is 0.5 μm.

6. The ultra-soft soil penetration sphere apparatus according to claim 1, characterized in that: The base has a base screw hole at the top, which is internally threaded, for connecting the loading device.

7. The ultra-soft soil penetration sphere apparatus according to claim 1, characterized in that: The aviation plug is inserted from the side of the base.

8. The ultra-soft soil penetration sphere apparatus according to claim 1, characterized in that: The cross-sectional area at the bottom of the force transmission rod is larger than that at the top.

9. The ultra-soft soil penetration sphere apparatus according to claim 8, characterized in that: The force transmission rod is 500mm long, with a top cross-sectional diameter of 10mm and a bottom cross-sectional diameter of 14mm.

10. The ultra-soft soil penetration sphere apparatus according to claim 1, characterized in that: The lower part of the force transmission rod has a groove for placing the sealing ring.

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