A pile foundation hole depth measuring device suitable for karst area pile foundation construction

Abstract

The present application relates to a kind of pile foundation hole depth measuring devices suitable for pile foundation construction in karst area, including fixed plate, setting on the fixed plate and being used for winding measuring rope winding roller, heavy hammer connected at the end of the measuring rope away from the winding roller, multiple support structures are arranged on the measuring rope and located between the winding roller and the heavy hammer;Support structure stays at the specific position of pile foundation hole along with the release of measuring rope, between two adjacent support rings, measuring rope can keep taut state, and always be located at the axial position of support ring 17, when pile foundation hole is deep, the posture of measuring rope is limited by support structure, and will not swing at will, measuring rope will not drag along the inner wall of pile foundation hole, it is favorable to protect heavy hammer and sensor assembly, while can avoid heavy hammer damage pile foundation hole inner wall, it is favorable to guarantee the integrity of pile foundation hole inner wall.

Description

A device for measuring the depth of pile foundation holes suitable for pile foundation construction in karst areas Technical Field

[0001] This invention relates to the field of linear dimension measurement technology for pile foundation holes, and specifically to a pile foundation hole depth measurement device suitable for pile foundation construction in karst areas. Background Technology

[0002] Measuring the depth of pile foundation holes using a measuring rope is a very practical method, widely used due to its simple structure, convenient operation, and low cost. However, in actual construction scenarios, especially when dealing with deep pile foundation holes in karst areas, traditional measuring devices have several unavoidable technical defects: due to the large depth of the pile foundation hole, the measuring rope lacks an effective posture restraint structure during release, making it susceptible to random swinging due to factors such as airflow within the hole, construction disturbances, and uneven distribution of its own weight. This swinging not only causes the measuring rope to deviate from the preset measurement axis, preventing the weight and sensor assembly from accurately reaching the preset measurement position at the bottom of the pile foundation hole, thus affecting the accuracy of depth measurement; but also makes it easy for the swinging measuring rope to drag along the inner wall of the pile foundation hole. During this process, the friction between the measuring rope and the hole wall will cause wear to the weight and sensor assembly. Long-term use will reduce the measurement accuracy of the sensor, and may even lead to problems such as loosening of the weight connection and sensor failure, increasing the maintenance cost and replacement frequency of the measuring device.

[0003] Furthermore, the geological conditions of the borehole walls in karst areas are inherently complex and fragile, often containing unfavorable geological structures such as caves and fissures, resulting in relatively poor borehole wall stability. In traditional measuring devices, the swinging hammer is highly susceptible to collision and impact with the inner wall of the borehole during its descent or ascent. This not only exacerbates the spalling of the borehole wall rock but may even induce borehole wall collapse and other safety hazards, severely damaging the integrity of the borehole wall. Damage to the borehole wall integrity not only further interferes with the accuracy of subsequent depth measurements but also increases the difficulty and cost of subsequent borehole wall support and cleaning procedures, delaying the construction period and posing a serious threat to the overall construction quality and safety of the pile foundation project. Summary of the Invention

[0004] In order to solve the above-mentioned problems in the existing technology, the present invention aims to provide a pile hole depth measuring device suitable for pile foundation construction in karst areas.

[0005] The technical solution adopted in this invention is as follows:

[0006] A pile hole depth measuring device suitable for pile foundation construction in karst areas includes a fixed plate, a winding roller disposed on the fixed plate and used for winding the measuring rope, a counterweight connected to the end of the measuring rope away from the winding roller, and a plurality of support structures disposed through the measuring rope and located between the winding roller and the counterweight.

[0007] The support structure includes multiple support rings, multiple rollers connected to the periphery of the support rings via tension springs, and a release ring and a locking ring disposed between any two adjacent support rings. Multiple connecting blocks are fixedly provided on the outer wall of the release ring, and multiple limiting buckles are fixedly provided at one end of the locking ring. The release ring and the locking ring are sleeved together and cooperate with the connecting blocks and the limiting buckles to control the relative rotation of the release ring and the locking ring, so that the two adjacent support rings switch between a locked state and a free state.

[0008] As a preferred embodiment of the present invention, a support plate is fixedly provided on one side of the fixed plate, the winding roller is rotatably mounted on the support plate, and a winding motor for driving the winding roller to rotate is provided on one side of the support plate.

[0009] As a preferred embodiment of the present invention, a swing plate is provided at the center of the fixed plate, and rotating pins are fixed at both ends of the swing plate. The rotating pins and the fixed plate are rotatably connected by a torsion spring. A protective sleeve is fixed on the side of the swing plate away from the winding roller, and the protective sleeve cooperates with the pile foundation hole.

[0010] As a preferred embodiment of the present invention, the fixed plate is provided with a sliding groove located on one side of the support plate, and a limiting plate is slidably disposed in the sliding groove. The limiting plate is locked in position with the fixed plate by bolts, and the end of the limiting plate cooperates with the swing plate.

[0011] As a preferred embodiment of the present invention, a slide rail is provided between the winding roller and the swing plate, and a fixing block is fixedly provided at each end of the slide rail. The fixing block is fixedly connected to the support plate. A guide frame is slidably provided on the slide rail. A rope hole is formed at the center of the guide frame. The measuring rope passes through the rope hole. A control spring is provided on one side of the guide frame. The two ends of the control spring are fixedly connected to one of the fixing blocks and the guide frame, respectively.

[0012] As a preferred embodiment of the present invention, a plurality of fixing sleeves are provided through the side wall of the support ring, and each fixing sleeve is provided with a second mounting groove and a first mounting groove on both sides, the second mounting groove being used to install the locking ring, and the first mounting groove being used to install the release ring.

[0013] As a preferred embodiment of the present invention, a control ring is provided in the middle of the plurality of fixed sleeves, and a plurality of extension seats corresponding to the fixed sleeves are fixedly provided on the periphery of the control ring. A fixed rod is fixedly provided at the end of the extension seat away from the control ring, and a control sleeve is sleeved on the end of the fixed rod away from the extension seat. The fixed rod and the control sleeve pass through the fixed sleeve. The tension spring is located on the periphery of the fixed rod. A washer is rotatably provided at the end of the control sleeve near the fixed rod. The two ends of the tension spring are respectively connected to the extension seat and the washer.

[0014] As a preferred embodiment of the present invention, a transmission gear is fixedly provided on the outer wall of the control sleeve, a control motor is fixedly provided on the inner wall of the fixed sleeve, and a drive gear is fixedly provided on the output shaft of the control motor, the drive gear meshing with the transmission gear.

[0015] As a preferred embodiment of the present invention, a mounting bracket is fixedly provided at one end of the control sleeve away from the gasket, a drive motor is provided on one side of the mounting bracket, the output shaft of the drive motor passes through the mounting bracket, a transmission shaft rotatably connected to the mounting bracket is fixedly provided on the output shaft of the drive motor, and a roller is fixedly provided on the transmission shaft, the roller being drum-shaped.

[0016] As a preferred embodiment of the present invention, the measuring rope passes through multiple control rings, and a locking rope ring is fixedly provided at the center of the lowest control ring, through which the measuring rope passes and is fixedly connected to the locking rope ring.

[0017] The beneficial effects of this invention are as follows: As a pile foundation hole depth measuring device suitable for pile foundation construction in karst areas, the support structure remains at a specific position in the pile foundation hole as the measuring rope is released. Between two adjacent support rings, the measuring rope can remain taut and always located at the axial center of the support ring 17. When the pile foundation hole is deep, the measuring rope is restricted in its posture by the support structure and will not swing arbitrarily. The measuring rope will not drag along the inner wall of the pile foundation hole, which is beneficial to protecting the hammer and sensor components. At the same time, it can avoid the hammer damaging the inner wall of the pile foundation hole, which is beneficial to ensuring the integrity of the inner wall of the pile foundation hole. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0019] Figure 1 is a schematic diagram of the structure of the present invention;

[0020] Figure 2 is a front view of the structure of the present invention as shown in Figure 1;

[0021] Figure 3 is a schematic diagram of the exploded structure of the present invention as shown in Figure 1;

[0022] Figure 4 is an exploded structural diagram of the support structure shown in Figure 3 of the present invention;

[0023] Figure 5 is a schematic diagram of the fit state of the support structure in Figure 1 of the present invention. Detailed Implementation

[0024] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0025] Referring to Figures 1-5, a pile foundation hole depth measuring device suitable for pile foundation construction in karst areas includes a fixed plate 11, a winding roller 13 mounted on the fixed plate 11 for winding the measuring rope 14, a weight 18 connected to the end of the measuring rope 14 away from the winding roller 13, and multiple support structures that pass through the measuring rope 14 and are located between the winding roller 13 and the weight 18. The fixed plate 11 and the weight 18 are respectively equipped with a ground sensor and a subsurface sensor, used to detect the operation of the device and determine whether the weight 18 has touched the bottom. As the measuring rope 14 is released, the support structures remain at a specific position in the pile foundation hole. When the pile foundation hole is deep, the measuring rope 14 is restricted in its posture by the support structures and will not swing arbitrarily. When the pile foundation hole has a small angle of deviation within the allowable construction range, the measuring rope 14 will not drag along the inner wall of the pile foundation hole, which helps protect the weight 18 and sensor components, and also prevents the weight 18 from damaging the inner wall of the pile foundation hole, thus ensuring the integrity of the inner wall of the pile foundation hole.

[0026] The support structure includes multiple support rings 17, multiple rollers 19 connected to the periphery of the support rings 17 via tension springs 39, and a release ring 29 and a locking ring 32 disposed between any two adjacent support rings 17. Multiple connecting blocks 30 are fixedly provided on the outer wall of the release ring 29, and multiple limiting buckles 31 are fixedly provided at one end of the locking ring 32. The release ring 29 and the locking ring 32 are sleeved together and cooperate with the connecting blocks 30 and the limiting buckles 31 to control the relative rotation of the release ring 29 and the locking ring 32, allowing adjacent support rings 17 to switch between a locked state and a free state. The support rings 17 can switch states at specific positions and be released one by one. After release, the distance between adjacent support rings 17 will not be too far. Between two adjacent support rings 17, the measuring rope 14 can remain taut and always located at the axial position of the support ring 17.

[0027] Advantageously, a support plate 12 is fixedly provided on one side of the fixed plate 11, and the winding roller 13 is rotatably mounted on the support plate 12. A winding motor 24 for driving the winding roller 13 to rotate is provided on one side of the support plate 12. The winding motor 24 actively releases the measuring rope 14, and then the roller 19 drives the support ring 17 to move actively. The time for releasing the measuring rope 14 serves as a buffer to prevent the weight 18 from falling rapidly and uncontrollably.

[0028] Advantageously, a swing plate 27 is provided at the center of the fixed plate 11, and rotating pins 28 are fixed at both ends of the swing plate 27. The rotating pins 28 and the fixed plate 11 are rotatably connected by torsion springs. A protective sleeve 16 is fixed on the side of the swing plate 27 away from the winding roller 13, and the protective sleeve 16 mates with the pile hole. The diameter of the protective sleeve 16 is smaller than that of the pile hole, so it does not need to be in contact with the inner wall of the pile hole. The protective sleeve 16 protects the section of the pile hole near the ground, preventing damage to the measuring device.

[0029] Advantageously, the fixed plate 11 is provided with a groove 26 located on one side of the support plate 12. A limiting plate 25 is slidably disposed in the groove 26. The limiting plate 25 is locked in position to the fixed plate 11 by bolts. The end of the limiting plate 25 cooperates with the swing plate 27. The swing plate 27 and the casing 16 can be adjusted according to the applicability of the angle between the pile hole and the ground.

[0030] Advantageously, a slide rail 23 is provided between the winding roller 13 and the swing plate 27. A fixing block 21 is fixed to each end of the slide rail 23, and the fixing block 21 is fixedly connected to the support plate 12. A guide frame 15 is slidably mounted on the slide rail 23. A rope hole 20 is formed at the center of the guide frame 15, through which the measuring rope 14 passes. A control spring 22 is provided on one side of the guide frame 15, and both ends of the control spring 22 are fixedly connected to one of the fixing blocks 21 and the guide frame 15, respectively. The control spring 22 has a tendency to pull the guide frame 15 to one side. When the measuring rope 14 is slack, the guide frame 15 is pulled to one side; when the measuring rope 14 is taut, the guide frame 15 is located at the center of the protective cylinder 16.

[0031] Advantageously, a plurality of fixing sleeves 33 are provided through the side wall of the support ring 17. Each fixing sleeve 33 has a second mounting groove 38 and a first mounting groove 34 on both sides. The second mounting groove 38 is used to install the locking ring 32, and the first mounting groove 34 is used to install the release ring 29. The fixing sleeve 33 has a square structure, with the outer side used to install the locking ring 32 and the release ring 29, and the inner side used to install the drive structure.

[0032] Advantageously, a control ring 37 is provided in the middle of the plurality of fixed sleeves 33. A plurality of extension seats 36 corresponding to the fixed sleeves 33 are fixedly provided around the control ring 37. A fixed rod 46 is fixedly provided at the end of the extension seat 36 away from the control ring 37. A control sleeve 43 is fitted onto the end of the fixed rod 46 away from the extension seat 36. The fixed rod 46 and the control sleeve 43 pass through the fixed sleeve 33. A tension spring 39 is located around the fixed rod 46. A washer 45 is rotatably provided at the end of the control sleeve 43 near the fixed rod 46. The two ends of the tension spring 39 are respectively connected to the extension seat 36 and the washer 45. The tension spring 39 tends to push the fixed rod 46 and the control sleeve 43 away from each other, thereby ensuring that the roller 19 always remains in close contact with the inner wall of the pile hole.

[0033] Advantageously, a transmission gear 44 is fixedly mounted on the outer wall of the control sleeve 43, and a control motor 48 is fixedly mounted on the inner wall of the fixed sleeve 33. A drive gear 47 is fixedly mounted on the output shaft of the control motor 48, and the drive gear 47 meshes with the transmission gear 44. The length of the transmission gear 44 is greater than the thickness of the drive gear 47, so even if the transmission gear 44 slides along with the control sleeve 43, it will not disengage from the drive gear.

[0034] Advantageously, a mounting bracket 40 is fixedly provided at the end of the control sleeve 43 away from the gasket 45. A drive motor 42 is provided on one side of the mounting bracket 40. The output shaft of the drive motor 42 passes through the mounting bracket 40. A transmission shaft 41, which is rotatably connected to the mounting bracket 40, is fixedly provided on the output shaft of the drive motor 42. A roller 19, which is drum-shaped, is fixedly provided on the transmission shaft 41. The drum-shaped roller 19 can better fit the inner wall of the pile hole. At the same time, when the roller 19 switches from a horizontal to a vertical state, the end of the roller 19 can reduce damage to the inner wall of the pile hole. The tension spring 39 will also adaptively extend and retract to ensure that the roller 19 can smoothly switch postures.

[0035] Advantageously, the measuring rope 14 passes through multiple control rings 37, and a locking rope ring 35 is fixedly provided at the center of the lowest control ring 37. The measuring rope 14 passes through and is fixedly connected to the locking rope ring 35. Only the lowest support ring 17 is fixed together with the measuring rope 14, and the other support rings can only move synchronously after being locked to the lowest support ring 17 by the locking ring 32 and the release ring 29.

[0036] Working principle of this invention:

[0037] In the initial state, the slope of the ground at the target pile hole is measured. Based on the measurement results, the angle of the casing 16 relative to the fixed plate 11 is adjusted. After the limiting plate 25 is slid along the slide 26 to a suitable position, the position of the limiting plate 25 is locked with bolts. The casing 16 and the target pile hole are placed coaxially. The fixed plate 11 is attached to the ground and fixed. Under the action of the torsion spring, the casing 16 tends to rotate so that the swing plate 27 and the fixed plate 11 remain horizontal. However, due to the limitation at the end of the limiting plate 25, the casing 16 is forced to maintain its current posture.

[0038] Multiple support rings 17 and a counterweight 18 are lowered into the target pile hole via a measuring rope 14. Under the action of the tension spring 39, the fixing rod 46 and the control sleeve 43 are kept away from each other. The roller 19 is forced to contact the inner wall of the pile hole. The output shaft of the drive motor 42, which is not working, is locked, preventing the roller 19 from rotating, thereby keeping the multiple support rings 17 stationary.

[0039] The winding motor 24 starts and controls the winding roller 13 to rotate. The winding roller 13 begins to release a section of the measuring rope 14. The measuring rope 14 becomes slack, and the guide frame 15 is forced to slide along the slide rail 23 under the action of the control spring 22. The guide frame 15 moves to one side, and the rope hole 20 is no longer located in the center of the rope hole 20.

[0040] The drive motor 42 starts, controlling its output shaft to drive the roller 19 to rotate. All the support rings 17 move downwards along the target pile hole simultaneously until the slack measuring rope 14 becomes taut. The taut measuring rope 14 overcomes the control spring 22, causing the guide frame 15 to return to the center of the rope hole 20. During this process, even if cavities are encountered in the karst area, the support rings 17 cannot maintain good contact with the sidewall of the pile hole, and the maximum drop distance of the support rings 17 is limited, preventing the weight 18 and sensor assembly from falling and being damaged.

[0041] After the ground sensor detects that the guide frame 15 has returned to the center position, and the underground sensor has not touched the bottom, the above operation is repeated. The winding motor 24 starts to release another section of the measuring rope 14, and the drive motor 42 starts again to control the support ring 17 to move downward.

[0042] After the measuring rope 14 is released a certain number of times, the uppermost support ring 17 is controlled to stop at the current position of the target pile hole. For the uppermost support ring 17, the control motor 48 is started, and its output shaft drives the drive gear 47 to rotate. Under the meshing action, the drive gear 47 drives the transmission gear 44 to rotate. The control sleeve 43 and the mounting bracket 40 rotate together with the transmission gear 44, so that the roller 19 rotates 90° around the axis of the control sleeve 43. At this time, the drive motor 42 is started to control the roller 19 to rotate horizontally. The uppermost support ring 17 rotates relative to the second support ring 17. The release ring 29 at the bottom of the uppermost support ring 17 and the connecting block 30 rotate synchronously. The connecting block 30 and the limit buckle 31 on the upper side of the second support ring 17 disengage. The uppermost support ring 17 switches to a free state and no longer moves with the other support rings 17. At this time, the control motor 48 is started again to control the roller 19 to reset. The tension spring 39 is tightened so that the roller 19 corresponding to the support ring 17 can press against the inner wall of the target pile hole.

[0043] When the measuring rope 14 is released again and the remaining support rings 17 are controlled to move downward, the measuring rope 14 will pass through the control ring 37 corresponding to the uppermost support ring 17 without changing the position of the uppermost support ring 17. The control ring 37 can keep the measuring rope 14 in a centered position, so that even if the pile hole is not absolutely vertical, the weight 18 and the measuring rope 14 will not be dragged along the wall inside the pile hole.

[0044] Based on the above principle, multiple support rings 17 are released and held at equal intervals; the number of support rings 17 can be adjusted. During construction, there is a margin based on the approximate depth of the target pile hole. At certain depths, a support ring 17 is held. Finally, the underground sensor reports that the hammer 18 has touched the bottom. The accurate depth of the target pile hole is determined based on the release length of the measuring rope 14.

[0045] During recycling, the same principle applies as described above. The drive motor 42 drives the roller 19 to roll upward against the wall, while the winding motor 24 drives the winding roller 13 to rotate and wind the measuring rope 14. Multiple support rings 17 return to the locked state from bottom to top. After all of them are collected, they move upward in sync with the counterweight 18 to the protective cylinder 16.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A device for measuring the depth of pile foundation holes suitable for pile foundation construction in karst areas, characterized in that: The system includes a fixed plate, a winding roller mounted on the fixed plate for winding a measuring rope, a counterweight connected to the end of the measuring rope away from the winding roller, and multiple support structures penetrating the measuring rope and located between the winding roller and the counterweight. Each support structure includes multiple support rings, multiple rollers connected to the periphery of the support rings via tension springs, and a release ring and a locking ring disposed between any two adjacent support rings. Multiple connecting blocks are fixed to the outer wall of the release ring, and multiple limit buckles are fixed to one end of the locking ring. The release ring and the locking ring are sleeved together and cooperate with the connecting blocks and the limit buckles to control the relative rotation of the release ring and the locking ring, allowing adjacent support rings to switch between a locked state and a free state. Multiple fixed sleeves penetrate the side wall of the support rings. Each fixed sleeve has a second mounting groove and a first mounting groove on both sides. The second mounting groove is used to install the locking ring, and the first mounting groove is used to install the release ring. A control mechanism is provided in the middle of the multiple fixed sleeves. The control ring has multiple extension seats corresponding to the fixed sleeve fixedly mounted around its periphery. A fixed rod is fixedly mounted at the end of each extension seat away from the control ring. A control sleeve is fitted onto the end of the fixed rod away from the extension seat. The fixed rod and the control sleeve pass through the fixed sleeve. A tension spring is located around the fixed rod. A washer is rotatably mounted at the end of the control sleeve near the fixed rod. The two ends of the tension spring are respectively connected to the extension seat and the washer. A transmission gear is fixedly mounted on the outer wall of the control sleeve. A control motor is fixedly mounted on the inner wall of the fixed sleeve. A drive gear is fixedly mounted on the output shaft of the control motor, and the drive gear meshes with the transmission gear. A mounting bracket is fixedly mounted at the end of the control sleeve away from the washer. A drive motor is mounted on one side of the mounting bracket. The output shaft of the drive motor passes through the mounting bracket. A transmission shaft rotatably connected to the mounting bracket is fixedly mounted on the output shaft of the drive motor. A drum-shaped roller is fixedly mounted on the transmission shaft.

2. The pile foundation hole depth measuring device suitable for pile foundation construction in karst areas according to claim 1, characterized in that: A support plate is fixedly provided on one side of the fixed plate, and the winding roller is rotatably mounted on the support plate. A winding motor for driving the winding roller to rotate is provided on one side of the support plate.

3. The pile hole depth measuring device suitable for pile foundation construction in karst areas according to claim 2, characterized in that: A swing plate is provided at the center of the fixed plate, and rotating pins are fixed at both ends of the swing plate. The rotating pins and the fixed plate are rotatably connected by a torsion spring. A protective sleeve is fixed on the side of the swing plate away from the winding roller, and the protective sleeve is engaged with the pile foundation hole.

4. The pile foundation hole depth measuring device suitable for pile foundation construction in karst areas according to claim 3, characterized in that: The fixed plate is provided with a sliding groove on one side of the support plate. A limiting plate is slidably arranged in the sliding groove. The limiting plate is locked to the fixed plate by bolts. The end of the limiting plate cooperates with the swing plate.

5. A pile foundation hole depth measuring device suitable for pile foundation construction in karst areas according to claim 3, characterized in that: A slide rail is provided between the winding roller and the swing plate. A fixing block is fixed at each end of the slide rail. The fixing block is fixedly connected to the support plate. A guide frame is slidably provided on the slide rail. A rope hole is formed at the center of the guide frame. The measuring rope passes through the rope hole. A control spring is provided on one side of the guide frame. The two ends of the control spring are fixedly connected to one of the fixing blocks and the guide frame, respectively.

6. The pile hole depth measuring device suitable for pile foundation construction in karst areas according to claim 1, characterized in that: The measuring rope passes through multiple control rings, and a locking rope loop is fixedly provided at the center of the lowest control ring. The measuring rope passes through and is fixedly connected to the locking rope loop.

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