Device and method for detecting sediment thickness at bottom of rotary-drilled pile in soft soil

Abstract

The present invention relates to the technical field of detecting sediment at the bottom of rotary bored piles, and specifically to a device and method for detecting the thickness of sediment at the bottom of rotary bored piles in soft soil. The top of a lower probe plate is fixedly connected with a lifting ring, the bottom of the lower probe plate is fixedly connected with a lower probe rod, the bottom of the lower probe rod is connected with a smoothing mechanism, the smoothing mechanism comprises a plurality of connecting plates, the plurality of connecting plates are evenly distributed and hinged to the outer side of the lower probe rod, the outer side of the lower probe rod is connected with a plurality of limit blocks for preventing the connecting plates from tilting downward, the outer side of the connecting plate is fixedly connected with a round rod, the outer side of the round rod is slidably connected with a fan-shaped plate, an inclination sensor is arranged in the fan-shaped plate, when the fan-shaped plate tilts upward, that is, the sediment at the bottom of the pile is unevenly distributed, the conical slider realizes a slow up and down reciprocating motion through the driving mechanism, so that the side surface of the conical slider squeezes the second roller, thereby driving the fan-shaped plate to slide back and forth on the outer side of the round rod through the L-shaped connecting rod, thereby driving the leveling mechanism to level.

Description

Technical Field

[0001] The invention relates to the technical field of detecting sediment at the bottom of a rotary-drilled pile, in particular to a device and a method for detecting the thickness of sediment at the bottom of a rotary-drilled pile in soft soil. Background Art

[0002] Bored piles are one of the common pile foundation forms in construction projects. The quality of the drilling is directly related to the quality of the pile foundation formed after pouring concrete. If the sediment at the bottom of the drilling is too thick, the pile length will be reduced; especially for the pile foundation that mainly bears the load at the bottom end, its bearing capacity will be directly affected, which may cause uneven settlement between the pile foundations, and thus bring safety hazards to the upper building structure.

[0003] Sediment refers to the sediment left over from the drilling and hole cleaning process or the hole wall collapse, which is not carried away by the circulating mud. It is generally coarse particles, such as sand and gravel. Figure 1 As shown, 33 is a rotary pile, 32 is a fluid material such as mud, and the sediment layer 31 is not always flat, and often has large fluctuations. Generally, the sediment of the rotary pile 33 near the hole wall is thicker, and the sediment at the center of the pile bottom is shallower;

[0004] If the commonly used methods in the prior art such as the hanging hammer method and the measuring needle and cake method are used for testing, the measured data will often have large errors and are more dependent on experience, while the error range of sediment thickness detection should be within 5 cm;

[0005] To this end, we propose a device and method for detecting the thickness of the sediment at the bottom of rotary bored piles in soft soil. The device and method can level the sediment with a small amount of stirring during the detection process, and then detect the thickness of the sediment, thereby reducing the problem of excessive fluctuations on the surface of the sediment layer affecting the detection accuracy, and can also reduce the uneven distribution of the sediment surface caused by the re-sedimentation of sediment and other sand and gravel. Summary of the invention

[0006] The purpose of the present invention is to provide a device and method for detecting the thickness of the sediment at the bottom of a rotary bored pile in soft soil, which can level the sediment with a small amount of stirring during the detection process, and then detect the thickness of the sediment, thereby reducing the problem of excessive fluctuations on the surface of the sediment layer affecting the detection accuracy, and can also reduce the uneven distribution of the sediment surface caused by the re-sedimentation of sediment and other sand and gravel.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for detecting the thickness of sediment at the bottom of a rotary-drilled pile in soft soil, comprising a lower probe plate, a lifting ring is fixedly connected to the top of the lower probe plate, a lower probe rod is fixedly connected to the bottom of the lower probe plate, a smoothing mechanism is connected to the bottom of the lower probe rod, the smoothing mechanism comprises a plurality of connecting plates, the plurality of connecting plates are evenly distributed and hinged to the outside of the lower probe rod, a limit block for preventing the connecting plate from tilting downward is fixedly connected to the outside of the lower probe rod, a round rod is fixedly connected to the outside of the connecting plate, a fan-shaped plate is slidably connected to the outside of the round rod, an inclination sensor is arranged in the fan-shaped plate, when the fan-shaped plate tilts upward, it indicates that the sediment at the bottom of the pile is unevenly distributed, and the inclination sensor can feed back the inclination information to an external controller;

[0008] The bottom of the fan-shaped plate is provided with a plurality of grooves, in which a paddle is rotatably connected via a hinge, and an inclined portion is provided at the bottom of the paddle plate, a torsion spring for resetting is fixedly connected between the paddle plate and the inside of the groove, and a shielding cloth for preventing debris from entering the groove is also fixedly connected between the paddle plate and the inside of the groove, and the shielding cloth is provided on the outside of the torsion spring, and when the fan-shaped plate moves in a direction away from the lower probe rod, the paddle plate slides over the sediment layer and can be closed in the direction of the lower probe rod, and when the fan-shaped plate moves in a direction close to the lower probe rod, the paddle plate is blocked and unfolded to push the sediment at a high position inward to achieve smoothing;

[0009] The outer edges of multiple fan-shaped plates can overlap the upper surface of the sediment with the hinge point of the connecting plate as the center. The unevenness of the sediment layer will lead to uneven inclination of the fan-shaped plates. The greater the inclination of the fan-shaped plates, the greater the reciprocating sliding distance of the fan-shaped plates.

[0010] The present invention can achieve the leveling of sediment with a small amount of stirring during the detection process, and then detect the thickness of the sediment, thereby reducing the uneven distribution of the sediment surface caused by the re-sedimentation of sediment and other sand and gravel. Under the above-mentioned setting, during the downward detection of the lower probe rod, when the sediment at the wall of the rotary drilling pile is thicker, the sediment in the thicker area will generate an upward squeezing force on the downward moving fan-shaped plate, and the squeezed fan-shaped plate will tilt upward, and the inclination sensor in the fan-shaped plate will transmit the signal to the external controller. After the fan-shaped plate tilts upward, the L-shaped connecting rod on the top of the fan-shaped plate will also move upward accordingly. When the upward inclination angle is greater, the contact point between the second roller and the conical slider set at the end of the L-shaped connecting rod is closer to the center line of the conical slider. Therefore, when the conical slider slides up and down on the outside of the lower probe rod, the contact time between the side surface of the conical slider and the second roller is longer. In the process of the conical slider sliding up and down, the fan plate can be forced to press down and slide left and right. Therefore, when the inclination of the fan plate is greater, the sliding stroke of the fan plate is longer, and at the same time, the downward extrusion force on the fan plate is greater, so that the reciprocating left and right movement can drive the paddle plate to pry the sediment on the raised part toward the center of the bottom of the rotary drilling pile.

[0011] Further preferably, a plurality of through holes are provided on the top of the sector plate for facilitating the upward and downward flow of mud when the sector plate descends in the mud.

[0012] Further preferably, an L-shaped connecting rod is fixedly connected to the top of the fan plate, and a second roller is provided at one end of the L-shaped connecting rod close to the lower probe rod. A conical slider is slidably connected to the outer side of the lower probe rod, and the conical slider cooperates with the second roller. The greater the inclination of the fan plate, the closer the contact point between the second roller corresponding to the fan plate and the conical slider is to the center line of the conical slider. In the process of the conical slider sliding up and down, the fan plate can be forced to press down and slide left and right.

[0013] Further preferably, the top of the conical slider is connected to a driving mechanism, and the conical slider realizes slow up and down reciprocating motion through the driving mechanism, so that the side portion of the conical slider squeezes the second roller, thereby driving the fan plate to slide back and forth on the outside of the round rod through the L-shaped connecting rod, thereby driving the leveling mechanism to perform leveling.

[0014] Further preferably, a first spring for resetting is fixedly connected between the sector plate and the connecting plate, and the first spring is movably sleeved on the outer side of the round rod.

[0015] Further preferably, the driving mechanism includes a dual-axis motor, which is fixedly arranged inside the lower probe rod, and the two output shaft ends of the dual-axis motor extend outside the lower probe rod and are fixedly connected to the vertical rod, the bottom end of the vertical rod is rotatably connected to the connecting rod through a pin shaft, and the bottom end of the connecting rod is rotatably connected to the top of the conical slider through a hinge, and the up and down reciprocating motion of the conical slider is realized by the rotation of the dual-axis motor.

[0016] Further preferably, the device also includes a sediment thickness measuring mechanism, which includes an electric telescopic rod fixing part, the electric telescopic rod fixing part is fixedly connected to the inside of the lower probe rod, the electric telescopic rod movable part is slidably connected to the inside of the electric telescopic rod fixing part, a hollow slide groove is provided at the bottom of the electric telescopic rod movable part, a slidingly connected limit plate is provided inside the hollow slide groove, a probe is fixedly connected to the bottom of the limit plate, and a pointed part is provided at the bottom of the probe.

[0017] Under the above settings, when the pointed head at the bottom of the probe first contacts the original soil layer at the bottom of the pile, since the hardness of the original soil layer is much greater than that of the sediment layer, the pointed head is subject to upward resistance, thereby driving the probe and the limit plate to slide upward in the hollow slide, and the second spring is squeezed. When the second spring is fully compressed, the pressure sensor embedded in the top of the limit plate contacts the inner wall of the top of the hollow slide, and the pressure sensor transmits the signal to the external controller. The transmission method is wireless transmission or transmission through a cable bound to the lowering wire rope. Electric power is also transmitted through the cable bound to the lowering wire rope, so that it can be known that the probe is in contact with the original soil layer at this time. At this time, the extension amount H of the movable part of the electric telescopic rod plus the fixed height d of the pointed head is the thickness of the sediment layer measured by the probe.

[0018] Further preferably, a second spring is fixedly connected between the limit plate and the hollow slide groove, and a pressure sensor is embedded in the top of the limit plate. When the tip of the probe touches the bottom of the pile whose hardness is greater than that of the sediment, the probe is fully extended into the hollow slide groove, the limit plate moves upward, the second spring is completely compressed, the pressure sensor contacts the top inner wall of the hollow slide groove, and the pressure sensor transmits the signal to the external controller after being squeezed.

[0019] Further preferably, two positioning rods are fixedly connected to the outer side of the connecting plate, and the fan-shaped plate is slidably connected to the positioning rods.

[0020] Further preferably, a plurality of telescopic rods are connected to the outer side of the probe plate, and a first roller is provided at the movable end of the telescopic rod. The telescopic amount of the telescopic rod is adjusted according to the aperture to achieve a sliding connection between the first roller and the pile wall, thereby achieving an auxiliary probe effect.

[0021] A method for detecting the thickness of sediment at the bottom of a rotary-drilled pile in soft soil by a device for detecting the thickness of sediment at the bottom of a rotary-drilled pile in soft soil, the method comprising the following steps:

[0022] S1: Slowly release the wire rope connected to the top of the lifting ring, and adjust the telescopic rod to ensure that the first roller slowly descends along the pile wall;

[0023] S2: After the fan-shaped plate touches the uneven surface of the sediment layer, the fan-shaped plate tilts. According to the unevenness of the sediment layer, the fan-shaped plate and the connecting plate rotate upward at different angles, and the distance between the second roller and the conical slider becomes closer to different degrees;

[0024] S3: The dual-axis motor drives the vertical rod to rotate, and the vertical rod drives the conical slider to slowly reciprocate up and down through the connecting rod;

[0025] S4: The side of the conical slider squeezes the second roller, driving the fan-shaped plate to slide back and forth on the outside of the round rod, thereby driving the paddle to level the particles in the raised part of the sediment layer toward the center until multiple fan-shaped plates are in a horizontal state. At this time, the leveling is completed;

[0026] S5: After leveling, the movable part of the electric telescopic rod moves downward. When the pointed part at the bottom of the probe touches the bottom of the pile, the probe is completely extended into the hollow chute. At this time, the extension amount H of the movable part of the electric telescopic rod plus the height d of the pointed part is the thickness of the sediment layer.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. During the downward exploration of the probe rod, when the sediment at the wall of the rotary pile is thick, the sediment in the thicker area will generate an upward squeezing force on the downward moving fan-shaped plate, and the squeezed fan-shaped plate will tilt upward. The inclination sensor in the fan-shaped plate will then transmit the signal to the external controller. After the fan-shaped plate tilts upward, the L-shaped connecting rod at the top of the fan-shaped plate will also tilt upward. The larger the upward inclination angle, the closer the contact point between the second roller at the end of the L-shaped connecting rod and the conical slider is to the center line of the conical slider. , so that when the conical slider slides up and down on the outside of the lower probe rod, the longer the contact time between the side surface of the conical slider and the second roller is, the more the conical slider can force the fan plate to press down and slide left and right during the sliding process, so that when the inclination of the fan plate is greater, the sliding stroke of the fan plate is longer, and at the same time, the fan plate is subjected to greater downward extrusion force, so that according to the different heights of the protrusions, the corresponding fan plate can be driven to move back and forth left and right with different strokes, thereby driving the paddle to pry the sediment of the protruding part to the center of the bottom of the rotary drilling pile;

[0029] 2. Multiple groups of grooves are provided at the bottom of the fan-shaped plate, and a paddle is connected to the groove by hinge rotation. An inclined portion is provided at the bottom of the paddle. A torsion spring for resetting is fixedly connected between the paddle and the inside of the groove. A shielding cloth for preventing debris from entering the groove is also fixedly connected between the paddle and the inside of the groove. The shielding cloth is provided on the outside of the torsion spring. When the fan-shaped plate moves in the direction away from the lower probe rod, the paddle slides over the sediment layer and can be closed in the direction of the lower probe rod. When the fan-shaped plate moves in the direction close to the lower probe rod, the paddle is blocked and unfolded to push the sediment at a high place inward to achieve smoothing.

[0030] 3. The sediment thickness measuring mechanism comprises an electric telescopic rod fixing part, the electric telescopic rod fixing part is fixedly connected to the inside of the lower probe rod, the electric telescopic rod movable part is slidably connected to the inside of the electric telescopic rod fixing part, a hollow slide groove is provided at the bottom of the movable part of the electric telescopic rod, a sliding connection limit plate is provided inside the hollow slide groove, a probe is fixedly connected to the bottom of the limit plate, and a pointed head is provided at the bottom of the probe. When the pointed head at the bottom of the probe first contacts the original soil layer at the bottom of the pile, since the hardness of the original soil layer is much greater than the sediment layer, the pointed head is subjected to upward resistance, thereby driving the probe and the limit plate to slide upward in the hollow slide groove, and the second spring is squeezed. When the second spring is fully compressed, the pressure sensor embedded at the top of the limit plate contacts the inner wall of the top of the hollow slide groove, and the pressure sensor transmits a signal to an external controller, so that it can be known that the probe contacts the original soil layer at this time. At this time, the extension amount H of the movable part of the electric telescopic rod plus the fixed height d of the pointed head is the thickness of the sediment layer measured by the probe;

[0031] 4. A plurality of telescopic rods are connected to the outer side of the exploration plate, and a first roller is provided at the movable end of the telescopic rod. The telescopic amount of the telescopic rod is adjusted according to the aperture to achieve a sliding connection between the first roller and the pile wall, thereby playing an auxiliary exploration effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the medium inside the rotary drilling pile in the prior art;

[0033] Figure 2 It is a schematic diagram of the structure of the present invention applied to a rotary drilling pile;

[0034] Figure 3 It is a schematic diagram of the three-dimensional structure of the upper half of the present invention;

[0035] Figure 4 It is a schematic diagram of the connection structure between the dual-axis motor and the conical slider inside the lower probe rod of the present invention;

[0036] Figure 5 It is a schematic diagram of the three-dimensional structure of the fan-shaped plate of the present invention when viewed from above;

[0037] Figure 6 It is a schematic diagram of the front cross-sectional plan structure of the fan-shaped plate of the present invention;

[0038] Figure 7 It is a schematic diagram of the connection structure of a single set of sector plates and a connecting plate with a lower probe rod of the present invention;

[0039] Figure 8 It is a schematic diagram of the connection structure of multiple sets of sector plates and connecting plates and the lower probe rod of the present invention;

[0040] Fig. 9 It is a schematic diagram of the cross-sectional plan structure of the connection between the probe and the lower probe rod of the present invention;

[0041] Fig.10 for Figure 2 A schematic diagram of the enlarged three-dimensional structure of the middle A area;

[0042] Fig.11 for Figure 6 Schematic diagram of the enlarged three-dimensional structure of the middle B area;

[0043] Fig.12 The present invention is a schematic diagram of the internal cross-sectional structure of the movable part of the electric telescopic rod after the pointed end of the probe touches the original soil layer.

[0044] In the figure: 1. lower probe plate; 2. lifting ring; 3. telescopic rod; 4. first roller; 5. lower probe rod; 6. connecting plate; 7. round rod; 8. fan-shaped plate; 9. through hole; 10. groove; 11. dial plate; 12. torsion spring; 13. conical slider; 14. L-shaped connecting rod; 15. second roller; 16. first spring; 17. positioning rod; 18. inclined portion; 19. double-axis motor; 20. vertical rod; 21. connecting rod; 22. fixed portion of electric telescopic rod; 23. movable portion of electric telescopic rod; 24. probe; 25. pointed portion; 26. hollow slide; 27. limit plate; 28. pressure sensor; 29. ​​second spring; 30. shielding cloth;

[0045] 31. Sediment layer; 32. Mud layer; 33. Rotary pile; 34. Controller. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] For examples, see Figure 1-12 The present invention provides a technical solution: a device for detecting the thickness of sediment at the bottom of a rotary-drilled pile in soft soil, comprising a lower probe plate 1, a lifting ring 2 is fixedly connected to the top of the lower probe plate 1, a lower probe rod 5 is fixedly connected to the bottom of the lower probe plate 1, a smoothing mechanism is connected to the bottom of the lower probe rod 5, and the smoothing mechanism comprises a plurality of connecting plates 6, the plurality of connecting plates 6 are evenly distributed and hinged to the outside of the lower probe rod 5, a limit block for preventing the connecting plate 6 from tilting downward is fixedly connected to the outside of the lower probe rod 5, a round rod 7 is fixedly connected to the outside of the connecting plate 6, a fan-shaped plate 8 is slidably connected to the outside of the round rod 7, an inclination sensor is arranged in the fan-shaped plate 8, when the fan-shaped plate 8 tilts upward, it indicates that the sediment at the bottom of the pile is unevenly distributed, and the inclination sensor can feed back the inclination information to an external controller 34;

[0048] A plurality of grooves 10 are provided at the bottom of the fan-shaped plate 8, and a paddle plate 11 is rotatably connected in the groove 10 through a hinge, and a sloped portion 18 is provided at the bottom of the paddle plate 11. A torsion spring 12 for resetting is fixedly connected between the paddle plate 11 and the inside of the groove 10, and a shielding cloth 30 for preventing debris from entering the groove 10 is also fixedly connected between the paddle plate 11 and the inside of the groove 10, and the shielding cloth 30 is arranged on the outside of the torsion spring 12. When the fan-shaped plate 8 moves in a direction away from the lower probe rod 5, the paddle plate 11 slides over the sediment layer 31 and can be closed in the direction of the lower probe rod 5. When the fan-shaped plate 8 moves in a direction close to the lower probe rod 5, the paddle plate 11 is blocked and unfolded to push the sediment at a high place inward to achieve smoothing.

[0049] The outer edges of multiple fan-shaped plates 8 can overlap on the upper surface of the sediment with the hinge point of the connecting plate 6 as the center. The uneven undulation of the sediment layer 31 will cause the uneven inclination of the fan-shaped plates 8. The greater the inclination of the fan-shaped plates 8, the greater the reciprocating sliding distance of the fan-shaped plates 8.

[0050] The present invention can achieve the leveling of sediment with a small amount of stirring during the detection process, and then detect the thickness of the sediment, thereby overcoming the problem of inaccurate detection caused by excessive fluctuations on the sediment surface, and reducing the uneven distribution of the sediment surface caused by the re-sedimentation of sediment and other sand and gravel. Under the above-mentioned setting, during the downward detection of the lower probe rod 5, when the sediment at the wall of the rotary drilled pile is thicker, the sediment in the thicker area will generate an upward squeezing force on the downward moving fan-shaped plate 8, and the squeezed fan-shaped plate 8 will tilt upward, and the inclination sensor in the fan-shaped plate 8 will transmit the signal to the external controller. After the fan-shaped plate 8 tilts upward, the L-shaped connecting rod 14 at the top of the fan-shaped plate 8 will also tilt upward. The greater the upward inclination angle, the closer the contact point between the second roller 15 and the conical slider 13 provided at the end of the L-shaped connecting rod 14 is to the center line of the conical slider 13. Therefore, when the conical slider 13 slides up and down on the outside of the lower probe rod 5, the contact time between the side surface of the conical slider 13 and the second roller 15 is longer. During the up and down sliding process of the conical slider 13, the fan plate 8 can be forced to press down and slide left and right. Therefore, the greater the inclination of the fan plate 8, the longer the sliding stroke of the fan plate 8 is, and the greater the downward extrusion force on the fan plate 8 is, so that the fan plate 8 can move back and forth left and right, driving the shifting plate 11 to shift the sediment on the raised part toward the center of the bottom of the rotary drilling pile, thereby achieving a leveling effect.

[0051] In this embodiment, specifically: a plurality of through holes 9 are provided on the top of the sector plate 8 for facilitating the upward and downward flow of mud when the sector plate 8 descends in the mud.

[0052] In this embodiment, specifically: an L-shaped connecting rod 14 is fixedly connected to the top of the fan plate 8, and a second roller 15 is provided at one end of the L-shaped connecting rod 14 close to the lower probe rod 5. A conical slider 13 is slidably connected to the outer side of the lower probe rod 5, and the conical slider 13 cooperates with the second roller 15. The greater the inclination of the fan plate 8, the closer the contact point between the second roller 15 corresponding to the fan plate 8 and the conical slider 13 is to the center line of the conical slider 13. During the process of the conical slider 13 sliding up and down, the fan plate 8 can be forced to press down and slide left and right.

[0053] In this embodiment, specifically: a driving mechanism is connected to the top of the conical slider 13, and the conical slider 13 realizes slow up and down reciprocating motion through the driving mechanism, so that the side portion of the conical slider 13 squeezes the second roller 15, thereby driving the fan plate 8 to slide back and forth on the outside of the round rod 7 through the L-shaped connecting rod 14, thereby driving the leveling mechanism to perform leveling.

[0054] In this embodiment, specifically: a first spring 16 for resetting is fixedly connected between the sector plate 8 and the connecting plate 6 , and the first spring 16 is movably sleeved on the outer side of the round rod 7 .

[0055] In this embodiment, specifically: the driving mechanism includes a dual-axis motor 19, the dual-axis motor 19 is fixedly arranged inside the lower probe rod 5, the two output shaft ends of the dual-axis motor 19 extend to the outside of the lower probe rod 5 and are fixedly connected to the vertical rod 20, the bottom end of the vertical rod 20 is rotatably connected to the connecting rod 21 through a pin shaft, the bottom end of the connecting rod 21 is rotatably connected to the top of the conical slider 13 through a hinge, and the up and down reciprocating motion of the conical slider 13 is realized by the rotation of the dual-axis motor 19.

[0056] In this embodiment, specifically: the device also includes a sediment thickness measuring mechanism, the sediment thickness measuring mechanism includes an electric telescopic rod fixing part 22, the electric telescopic rod fixing part 22 is fixedly connected to the inside of the lower probe rod 5, the electric telescopic rod fixing part 22 is internally slidably connected to the electric telescopic rod movable part 23, the bottom of the electric telescopic rod movable part 23 is provided with a hollow slide groove 26, the inside of the hollow slide groove 26 is provided with a sliding connection limit plate 27, the bottom of the limit plate 27 is fixedly connected to the probe 24, and the bottom of the probe 24 is provided with a pointed part 25.

[0057] Under the above setting, when the pointed head 25 at the bottom of the probe 24 first contacts the original soil layer at the bottom of the pile, since the hardness of the original soil layer is much greater than the sediment layer 31, the pointed head 25 is subjected to upward resistance, thereby driving the probe 24 and the limit plate 27 to slide upward in the hollow slide 26, and the second spring 29 is squeezed. When the second spring 29 is fully compressed, the pressure sensor 28 embedded in the top of the limit plate 27 contacts the inner wall of the top of the hollow slide 26, and the pressure sensor 28 transmits the signal to the external controller. The transmission method is wireless transmission or transmission through a cable bound to the lowering wire rope. Electric power is also transmitted through the cable bound to the lowering wire rope, so that it can be known that the probe 24 contacts the original soil layer at this time. At this time, the extension amount H of the movable part 23 of the electric telescopic rod plus the fixed height d of the pointed head 25 is the thickness of the sediment layer 31 measured by the probe 24.

[0058] In this embodiment, specifically: a second spring 29 is fixedly connected between the limit plate 27 and the hollow slide groove 26, and a pressure sensor 28 is embedded in the top of the limit plate 27. When the pointed end 25 of the probe 24 touches the pile bottom whose hardness is greater than that of the sediment, the probe 24 is fully extended into the hollow slide groove 26, the limit plate 27 moves upward, the second spring 29 is fully compressed, and the pressure sensor 28 contacts the top inner wall of the hollow slide groove 26. After being squeezed, the pressure sensor 28 transmits the signal to the external controller 34.

[0059] In this embodiment, specifically: two positioning rods 17 are fixedly connected to the outer side of the connecting plate 6 , and the sector plate 8 is slidably connected to the positioning rods 17 .

[0060] In this embodiment, specifically: a plurality of telescopic rods 3 are connected to the outer side of the exploration plate 1, and a first roller 4 is provided at the movable end of the telescopic rod 3. The telescopic amount of the telescopic rod 3 is adjusted according to the aperture to achieve a sliding connection between the first roller 4 and the pile wall, thereby achieving an auxiliary exploration effect.

[0061] The present invention also discloses a method for detecting the thickness of sediment at the bottom of a rotary-drilled pile in soft soil by using a device for detecting the thickness of sediment at the bottom of a rotary-drilled pile in soft soil. The method comprises the following steps:

[0062] S1: slowly release the wire rope connected to the top of the lifting ring 2, and adjust the telescopic rod 3 to ensure that the first roller 4 slowly descends along the pile wall;

[0063] S2: After the fan-shaped plate 8 touches the uneven surface of the sediment layer 31, the fan-shaped plate 8 tilts. According to the unevenness of the sediment layer 31, the fan-shaped plate 8 and the connecting plate 6 rotate upward at different angles, and the distance between the second roller 15 and the conical slider 13 becomes closer to different degrees;

[0064] S3: The dual-axis motor 19 drives the vertical rod 20 to rotate, and the vertical rod 20 drives the conical slider 13 to slowly slide up and down through the connecting rod 21;

[0065] S4: The side of the conical slider 13 squeezes the second roller 15, driving the sector plate 8 to slide back and forth on the outside of the round rod 7, thereby driving the paddle plate 11 to level the particles of the raised part of the sediment layer 31 toward the center until the multiple sector plates 8 are in a horizontal state. At this time, the leveling is completed;

[0066] S5: After leveling, the movable part 23 of the electric telescopic rod moves downward. When the pointed part 25 at the bottom of the probe 24 touches the bottom of the pile, the probe 24 is completely inserted into the hollow chute 26. At this time, the extension amount H of the movable part 23 of the electric telescopic rod plus the height d of the pointed part 25 is the thickness of the sediment layer 31.

[0067] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting the thickness of sediment at the bottom of a rotary-drilled pile in soft soil, comprising a lower probe plate (1), the top of the lower probe plate (1) being fixedly connected to a lifting ring (2), and the bottom of the lower probe plate (1) being fixedly connected to a lower probe rod (5), characterized in that: The bottom of the lower probe rod (5) is connected to a smoothing mechanism, which includes a plurality of connecting plates (6), which are evenly distributed and hinged on the outer side of the lower probe rod (5), and a limit block for preventing the connecting plate (6) from tilting downward is fixedly connected to the outer side of the bottom end of the lower probe rod (5), and a round rod (7) is fixedly connected to the outer side of the connecting plate (6), and a fan-shaped plate (8) is slidably connected to the outer side of the round rod (7), and an inclination sensor is arranged in the fan-shaped plate (8). When the fan-shaped plate (8) tilts upward, it indicates that the sediment at the bottom of the pile is unevenly distributed, and the inclination sensor can feed back the inclination information to an external controller (34); The bottom of the fan-shaped plate (8) is provided with a plurality of grooves (10), and a paddle plate (11) is rotatably connected to the groove (10) via a hinge, and a sloped portion (18) is provided at the bottom of the paddle plate (11). A torsion spring (12) for resetting is fixedly connected between the paddle plate (11) and the inside of the groove (10), and a shielding cloth (30) for preventing debris from entering the groove (10) is also fixedly connected between the paddle plate (11) and the inside of the groove (10), and the shielding cloth (30) is provided on the outside of the torsion spring (12). When the fan-shaped plate (8) moves in a direction away from the lower probe rod (5), the paddle plate (11) slides over the sediment layer (31) and can be closed in the direction of the lower probe rod (5). When the fan-shaped plate (8) moves in a direction close to the lower probe rod (5), the paddle plate (11) is blocked and unfolded to push the sediment at a high position inward to achieve smoothing. The outer edges of the plurality of fan-shaped plates (8) can overlap the upper surface of the sediment with the hinge point of the connecting plate (6) as the center. The unevenness of the undulation of the sediment layer (31) will lead to the unevenness of the inclination of the fan-shaped plates (8). The greater the inclination of the fan-shaped plates (8), the greater the reciprocating sliding distance of the fan-shaped plates (8).

2. The device for detecting the thickness of sediment at the bottom of a rotary-drilled pile in soft soil according to claim 1, characterized in that: A plurality of through holes (9) are provided on the top of the sector plate (8) for facilitating the upward and downward flow of mud when the sector plate (8) descends in the mud.

3. The device for detecting the thickness of sediment at the bottom of a rotary-drilled pile in soft soil according to claim 2, characterized in that: An L-shaped connecting rod (14) is fixedly connected to the top of the fan-shaped plate (8), and a second roller (15) is provided at one end of the L-shaped connecting rod (14) close to the lower probe rod (5). A conical slider (13) is slidably connected to the outer side of the lower probe rod (5). The conical slider (13) cooperates with the second roller (15). The greater the inclination of the fan-shaped plate (8), the closer the contact point between the second roller (15) corresponding to the fan-shaped plate (8) and the conical slider (13) is to the center line of the conical slider (13). In the process of sliding up and down, the conical slider (13) can force the fan-shaped plate (8) to press down and slide left and right.

4. The device for detecting the thickness of sediment at the bottom of a rotary-drilled pile in soft soil according to claim 3 is characterized in that: The top of the conical slider (13) is connected to a driving mechanism, and the conical slider (13) is subjected to slow up-and-down reciprocating motion through the driving mechanism, so that the side surface of the conical slider (13) presses the second roller (15), thereby driving the fan-shaped plate (8) to slide reciprocatingly on the outer side of the round rod (7) through the L-shaped connecting rod (14), thereby driving the leveling mechanism to perform leveling.

5. The device for detecting the thickness of sediment at the bottom of a rotary-drilled pile in soft soil according to claim 4, characterized in that: A first spring (16) for resetting is fixedly connected between the fan-shaped plate (8) and the connecting plate (6), and the first spring (16) is movably sleeved on the outer side of the round rod (7). Two positioning rods (17) are fixedly connected to the outer side of the connecting plate (6), and the fan-shaped plate (8) is slidably connected to the positioning rods (17).

6. The device for detecting the thickness of sediment at the bottom of a rotary-drilled pile in soft soil according to claim 5, characterized in that: The driving mechanism comprises a double-axis motor (19), the double-axis motor (19) is fixedly arranged inside the lower probe rod (5), two output shaft ends of the double-axis motor (19) extend outside the lower probe rod (5) and are fixedly connected to a vertical rod (20), the bottom end of the vertical rod (20) is rotatably connected to a connecting rod (21) via a pin, the bottom end of the connecting rod (21) is rotatably connected to the top of the conical slider (13) via a hinge, and the conical slider (13) is reciprocated up and down by the rotation of the double-axis motor (19).

7. The device for detecting the thickness of sediment at the bottom of a rotary-drilled pile in soft soil according to claim 6, characterized in that: The device also includes a sediment thickness measuring mechanism, which includes an electric telescopic rod fixing portion (22), the electric telescopic rod fixing portion (22) being fixedly connected to the interior of the lower probe rod (5), the electric telescopic rod movable portion (23) being slidably connected to the interior of the electric telescopic rod fixing portion (22), a hollow slide groove (26) being provided at the bottom of the electric telescopic rod movable portion (23), a slidably connected limit plate (27) being provided inside the hollow slide groove (26), a probe (24) being fixedly connected to the bottom of the limit plate (27), and a pointed portion (25) being provided at the bottom of the probe (24).

8. The device for detecting the thickness of sediment at the bottom of a rotary-drilled pile in soft soil according to claim 7, characterized in that: A second spring (29) is fixedly connected between the limit plate (27) and the hollow chute (26), and a pressure sensor (28) is embedded in the top of the limit plate (27). When the tip (25) of the probe (24) touches the bottom of the pile whose hardness is greater than that of the sediment, the probe (24) can be fully extended into the hollow chute (26), the limit plate (27) moves upward, the second spring (29) is fully compressed, the pressure sensor (28) contacts the top inner wall of the hollow chute (26), and the pressure sensor (28) transmits a signal to an external controller (34) after being squeezed.

9. The device for detecting the thickness of sediment at the bottom of a rotary-drilled pile in soft soil according to claim 8, characterized in that: The outer side of the probe plate (1) is connected to a plurality of telescopic rods (3), and the movable ends of the telescopic rods (3) are provided with first rollers (4). The telescopic amounts of the telescopic rods (3) are adjusted according to the apertures to achieve sliding connection between the first rollers (4) and the pile wall, thereby achieving an auxiliary probe effect.

10. A method for using the device for detecting the thickness of sediment at the bottom of a rotary-drilled pile in soft soil as claimed in claim 9, characterized in that: The method comprises the following steps: S1: slowly release the steel wire rope connected to the top of the lifting ring (2), and adjust the telescopic rod (3) to ensure that the first roller (4) slowly descends along the pile wall; S2: After the fan-shaped plate (8) touches the uneven surface of the sediment layer (31), the fan-shaped plate (8) tilts. According to the unevenness of the sediment layer (31), the fan-shaped plate (8) and the connecting plate (6) rotate upward at different angles, and the distance between the second roller (15) and the conical slider (13) becomes closer to different degrees; S3: The dual-axis motor (19) drives the vertical rod (20) to rotate, and the vertical rod (20) drives the conical slider (13) to slowly slide up and down through the connecting rod (21); S4: the side surface of the conical slider (13) squeezes the second roller (15), driving the fan-shaped plate (8) to slide back and forth on the outer side of the round rod (7), thereby driving the paddle plate (11) to level the particles of the raised part of the sediment layer (31) toward the center until the plurality of fan-shaped plates (8) approach a horizontal state, at which point the leveling is completed; S5: After leveling, the movable part (23) of the electric telescopic rod moves downward. When the pointed part (25) at the bottom of the probe (24) touches the bottom of the pile, the probe (24) is completely inserted into the hollow chute (26). At this time, the extension amount H of the movable part (23) of the electric telescopic rod plus the height d of the pointed part (25) is the thickness of the sediment layer (31).

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