Sand soil pipe pile soil plug effect experiment measuring device

Abstract

The utility model relates to the technical field of pile foundation engineering, in order to solve the low accuracy of existing soil plug height measurement problem, proposes a kind of sand pipe pile soil plug effect experimental measuring device, including model box, inside filling has experimental sand soil;Open pipe pile, vertical arrangement is in the model box inside, for simulating sand layer sinking pile working condition;Soil plug height measurement structure, detachably set in the open pipe pile top, including base shell, positioning mechanism and measurement mechanism. The utility model can save artificial supporting ruler operation, simultaneously, still can rely on the vertical posture of measuring scale to judge pile body inclination, accurately identify the soil plug top surface position in pile cavity.

Description

Technical Field

[0001] This utility model relates to the field of pile foundation engineering technology, specifically to an experimental measurement device for the soil plugging effect of sand pipe piles. Background Technology

[0002] In the construction of photovoltaic power stations in desert and Gobi areas, due to the loose, uniformly granulated, and low-density soil characteristics of desert sites, prefabricated open-ended pipe piles are commonly used for photovoltaic foundations. These piles rely on the side friction of the pile and the soil plug inside the pile cavity to jointly bear the load of the upper photovoltaic support structure. The degree of soil plug closure directly determines the vertical bearing capacity of the pile foundation. Currently, indoor static pressure model tests are being conducted to investigate the evolution of the soil plug and the variation characteristics of internal friction in open-ended pipe piles under sandy soil conditions. This is an important research method for predicting the actual bearing capacity of desert photovoltaic pipe piles and optimizing pile foundation design parameters.

[0003] Current conventional methods for measuring the soil plug height of open-end pipe piles in indoor model experiments typically involve using a simple probe made by attaching a thin iron rod to a narrow, flexible ruler. The probe is manually lowered along the inner wall of the open-end pipe pile to the bottom. During pile driving, the soil plug raises the probe, and the ruler is intermittently pulled out to read the scale, thus monitoring changes in the soil plug height. This method has the following significant shortcomings:

[0004] 1. During the test, it is impossible to determine in real time whether the open pipe pile has tilted or shifted, and it is difficult to eliminate the interference of the eccentric force on the soil plug development law and bearing capacity test results, resulting in poor test controllability.

[0005] 2. The height of the top surface of the soil plug inside the open pipe pile is generally lower than the height of the sand accumulation outside the pile. The view inside the pile cavity is obstructed and the visibility is poor. It is difficult to identify the true top surface position of the soil plug by manual observation, which further increases the reading deviation of the soil plug height.

[0006] 3. Throughout the experiment, the experimenter needs to hold the probe by hand. Disturbance during pile driving can easily cause the iron rod to shift or detach from the inner wall of the pile, resulting in the probe becoming skewed, bent, or shifted, leading to a large error in the soil plug height reading. Utility Model Content

[0007] To address the shortcomings of the existing technology, this utility model aims to provide an experimental measurement device for the soil plug effect of sand pipe piles. This device eliminates the need for manual operation of the measuring tape, avoids reading errors caused by tape tilt, and can also determine the pile inclination and accurately identify the position of the top surface of the soil plug inside the pile cavity based on the vertical posture of the measuring tape. This effectively improves the testing accuracy and efficiency of the sand pipe pile soil plug effect model test.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] An experimental measurement device for the soil plugging effect of sand pipe piles includes:

[0010] The model box was filled with experimental sand.

[0011] Open-end pipe piles are vertically arranged inside the model box to simulate pile driving conditions in sandy soil strata.

[0012] The soil plug height measuring structure is detachably installed on the top of the open pipe pile and includes a base shell, a positioning mechanism, and a measuring mechanism.

[0013] Furthermore, based on the above technical solutions, the positioning mechanism includes:

[0014] An inflatable balloon is located above the base shell, with a connecting cylinder at its bottom. An air inlet is located inside the connecting cylinder, and an air outlet is located on one side of the connecting cylinder.

[0015] A fixing block is fixedly installed at the bottom of the base shell, and a fixing airbag is sleeved on its outer side;

[0016] The connecting tube is connected at one end to the connecting tube and at the other end to the fixed airbag.

[0017] Furthermore, based on the above technical solution, the air intake component includes:

[0018] A fixing plate is located inside the connecting cylinder;

[0019] The sealing block is slidably positioned at the junction of the inflatable balloon and the connecting tube.

[0020] One end of the first elastic element is connected to the fixed plate, and the other end is connected to the sealing block.

[0021] Furthermore, based on the above technical solution, the measuring mechanism includes:

[0022] The measuring component, located inside the base housing, is used to measure the height of the soil plug inside the open-ended pipe pile;

[0023] The pneumatic clutch assembly is located on one side of the measuring assembly and is used to limit and fix the measuring assembly and to retract and release it.

[0024] Furthermore, based on the above technical solution, the measurement component includes:

[0025] The support plate is fixedly installed on one side of the inner wall of the base shell, and an annular shell is fixedly installed on the other side;

[0026] The reel has one end rotatably mounted on the inner wall of the annular shell, and the other end extends to the outer side of the base shell and is connected to a rotating knob. The end of the reel located inside the annular shell is equipped with a spiral spring.

[0027] The measuring tape is wound on a spool, with its free end extending from the annular shell and connected to a gravity block.

[0028] Furthermore, based on the above technical solutions, the pneumatic clutch assembly includes:

[0029] The ratchet is fitted onto the outside of the annular shell of the spool;

[0030] A pawl is rotatably mounted on one side of the ratchet, and a spring plate is provided on it;

[0031] The lever is fixedly mounted on one side of the pawl;

[0032] The first support beam is slidably mounted on one side of the support plate and located above the actuating rod. A telescopic tube is mounted on it, and the other end of the telescopic tube is connected to the connecting air pipe.

[0033] The second support beam is fixedly installed on one side of the support plate and located below the actuating rod. Multiple second elastic elements are provided on its upper surface.

[0034] The beneficial effects of this utility model are:

[0035] 1. The positioning mechanism of this utility model can simultaneously realize the air-inflated clamping installation of the soil plug height measuring structure and the lower part of the measuring tape. Moreover, it can also visually determine whether the open pipe pile is placed vertically by observing the position of the gravity block, which is convenient for adjustment and avoids abnormal soil plug accumulation and test data distortion caused by pile body tilt.

[0036] 2. The measuring component of this utility model utilizes the mechanical cooperation of gravity block and preload of spiral spring. When the soil plug is raised and the measuring tape has excess length, the spiral spring can immediately retract the excess tape, avoiding the measurement tape from becoming loose, bent, or curled, which would lead to inaccurate measurement of the soil plug height.

[0037] 3. In the inflated state, the pneumatic clutch assembly of this utility model allows the telescopic tube to press down the lever to release the ratchet lock, and the length of the tape can be freely adjusted; in the depressurized state, the lever automatically resets to engage the ratchet and pawl, fixing the current measurement data, and the soil plug height data can be paused, saved, and remeasured at any time. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the overall structure of the experimental measurement device for the soil plugging effect of sand pipe piles of this utility model;

[0039] Figure 2 This is a diagram showing the connection relationship between the open-end pipe pile and the soil plug height measurement structure of this utility model;

[0040] Figure 3 This is a schematic diagram of the soil plug height measuring structure of this utility model;

[0041] Figure 4 This utility model Figure 3 A schematic diagram of the structure after removing the base shell;

[0042] Figure 5 This utility model Figure 4 Enlarged view of point A;

[0043] Figure 6 This is a schematic diagram of the measuring mechanism structure of this utility model;

[0044] Figure 7 This is a cross-sectional structural diagram of the positioning mechanism of this utility model;

[0045] Figure 8 This utility model Figure 7 Enlarged view of point B;

[0046] Figure 9 This is a schematic diagram showing the connection relationship between the measuring component and the pneumatic clutch component of this utility model;

[0047] Figure 10 This is a schematic diagram of the pneumatic clutch assembly of this utility model.

[0048] The components include: 1. Model box; 11. Experimental sand; 2. Open pipe pile; 3. Base shell; 31. Ventilation hole; 4. Positioning mechanism; 41. Inflatable air bladder; 411. Connecting cylinder; 412. One-way air inlet; 42. Fixing block; 421. Fixing air bladder; 43. Connecting air pipe; 44. Air inlet component; 441. Fixing plate; 442. Sealing block; 443. First elastic component; 45. Exhaust component; 5. Measuring assembly; 51. Support plate; 511. Sliding groove; 52. Annular shell; 53. Roller; 54. Rotating knob; 55. Spiral spring; 56. Measuring scale; 57. Gravity block; 6. Pneumatic clutch assembly; 61. Ratchet; 62. Pad; 63. Spring plate; 64. Actuating rod; 65. First support beam; 66. Telescopic tube; 67. Second support beam; 68. Second elastic component. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0050] Example

[0051] See Figures 1-10 This application discloses an experimental measurement device for the soil plug effect of sand pipe piles, which is mainly used to measure the soil plug accumulation height inside the pipe pile during the indoor simulation of the driving process of open pipe piles in sandy soil strata, so as to analyze the evolution law of the soil plug effect. It includes a model box 1, an open pipe pile 2, and a soil plug height measurement structure.

[0052] The model box 1 is generally a rectangular box with an opening at the top, made of transparent acrylic material, which facilitates the direct observation of the internal sand state and the pile driving and soil plug accumulation during the experiment. The model box 1 is filled with homogeneous experimental sand to simulate the working conditions of natural sandy soil strata.

[0053] The open-ended pipe pile 2 is a hollow cylindrical pipe pile model with openings at the top and bottom. It is vertically embedded inside the model box to simulate the construction conditions of static pressure pile driving and pile driving in sandy soil strata in actual engineering.

[0054] It should be noted that, preferably, the experimental sand 11 inside the model box 1 is filled to a height of 600mm-450mm, which meets the test requirements for the maximum penetration depth of the open-ended pipe pile 2; the overall height of the open-ended pipe pile 2 is 400mm-500mm, the open-ended pipe pile 2 is made of transparent acrylic tubing, and has a moderate self-weight. The soil plug height measuring structure at the top of the pile is a lightweight plastic component. The overall center of gravity of the entire device is low and the total self-weight is balanced. Since most of the pile body of the open-ended pipe pile 2 is embedded inside the experimental sand 11, it achieves vertical self-support by relying on the lateral clamping and squeezing force of the sand. The circumferential clamping force of the sand can fully support the self-weight of the entire device. No hand support is required during the entire test, and it will not tip over.

[0055] Next, the soil plug height measuring structure is detachably mounted on the top port of the open pipe pile 2 to measure the soil plug accumulation height inside the open pipe pile 2, and includes a base housing 3, a positioning mechanism 4 and a measuring mechanism.

[0056] Furthermore, the base shell 3 has a hollow cylindrical structure, and its outer diameter matches the outer diameter of the open pipe pile 2. It can be directly sleeved on the top of the open pipe pile 2. A vent hole 31 is provided on the upper surface of the base shell 3 to ensure that the internal air pressure of the open pipe pile 2 is connected with the outside, so as to avoid the formation of a closed air cavity inside the open pipe pile 2 that would interfere with the soil plug accumulation state and height measurement data.

[0057] The positioning mechanism 4 is installed inside the base housing 3 and is used to coaxially install the soil plug height measuring structure on the top of the open pipe pile 2. It includes an inflatable balloon 41, a fixing block 42, a connecting air pipe 43, an air inlet 44, and an air outlet 45.

[0058] Specifically, the bottom of the inflatable bladder 41 is integrally connected with a connecting cylinder 411, which is vertically inserted and fixed at the center of the upper top surface of the base housing 3. The top of the inflatable bladder 41 has a one-way air inlet 412, where a one-way valve is installed to allow only outside air to enter the inflatable bladder 41 in one direction.

[0059] Furthermore, an air inlet 44 is installed inside the connecting cylinder 411, which allows gas in the inflatable balloon 41 to enter the measuring mechanism in one direction only through the air inlet 44. It includes a fixing plate 441, a sealing block 442, and a first elastic member 443.

[0060] The fixing plate 441 is fixed to the middle section of the connecting cylinder 411 by lugs on both sides. The diameter of the fixing plate is smaller than the inner diameter of the connecting cylinder 411 to ensure normal gas flow. The sealing block 442 is a conical sealing plug that is slidably fitted at the communication port between the inflatable balloon 41 and the connecting cylinder 411 and can slide vertically up and down. The first elastic element 443 is preferably a compression spring, with one end fixed to the upper surface of the fixing plate 441 and the other end fixedly connected to the bottom surface of the sealing block 442. Under normal conditions, the first elastic element 443 is in a slightly compressed state, pushing the sealing block 442 to fit the communication port. At this time, the inflatable balloon 41 and the connecting cylinder 411 are sealed and not connected. When the inflatable balloon 41 is squeezed, the air pressure overcomes the elastic force of the first elastic element 443 and pushes open the sealing block 442. The gas inside the inflatable balloon 41 smoothly enters the gas passage of the connecting cylinder 411. After the squeezing of the inflatable balloon 41 stops, the first elastic element 443 rebounds and resets, and the sealing block 442 re-seals the port to achieve a pressure-holding effect.

[0061] Furthermore, the side wall of the connecting cylinder 411 has a transverse through hole and is equipped with an exhaust component 45, including an exhaust pipe. The exhaust pipe has an exhaust hole at its top. A manual ball valve is rotatably mounted inside the exhaust pipe. The ball valve core can be rotated by rotating the operating knob to control the overlap and misalignment of the ball valve port and the exhaust hole, thereby realizing the discharge and sealing of the gas inside the connecting cylinder 411, and completing the pressure relief disassembly and pressure holding positioning switching of the soil plug height measuring structure.

[0062] A fixing block 42 is connected to the bottom center of the base shell 3. The outer diameter of the fixing block 42 is smaller than the inner diameter of the open pipe pile 2, and it can extend into the top of the open pipe pile 2. A ventilation hole is also provided on the fixing block 42. A fixing airbag 421 is circumferentially wrapped and fixed on the outside of the fixing block 42. The fixing airbag 421 is an annular rubber airbag. After inflation, it can expand radially and fit tightly against the inner wall of the open pipe pile 2 to achieve tight positioning of the inner wall.

[0063] The connecting air pipe 43 is located between the connecting cylinder 411 and the fixed air bag 421. One end is connected to the connecting cylinder 411 and the other end is connected to the inside of the fixed air bag 421. It is used to connect the air passages of the connecting cylinder 411 and the fixed air bag 421, realize the synchronous linkage of inflation and depressurization, realize the installation and disassembly of the soil plug height measuring structure, and can be applied to open pipe piles 2 of different sizes.

[0064] Next, the measuring mechanism is located inside the base housing 3 and includes a measuring component 5 and a pneumatic clutch component 6.

[0065] The measuring component 5 is used to measure the height of the soil plug inside the open pipe pile 2. It includes a support plate 51, an annular shell 52, a roller 53, a rotating knob 54, a spiral spring 55, a measuring tape 56, and a gravity block 57.

[0066] Specifically, the support plate 51 is fixedly connected to the inner wall of the base housing 3 on one side, and an annular shell 52 is fixedly provided on the other side. One end of the roller 53 is rotatably mounted on the inner wall of the annular shell 52 through a bearing, and the other end extends through the annular shell 52 and the base housing 3 to the outside, and is connected to a rotating knob 54. The experimenter can manually rotate the rotating knob 54 to drive the roller 53 to rotate.

[0067] The end of the scroll 53 located inside the annular shell 52 is equipped with a spiral spring 55. The inner end of the spiral spring 55 is fixed to the scroll 53, and the outer end is fixed to the inner wall of the annular shell 52. Under normal conditions, the spiral spring 55 is in a tightened state, which can drive the scroll 53 to automatically rotate and reset.

[0068] A measuring tape 56 is tightly wound on the shaft of the scroll 53 located inside the annular shell 52. The measuring tape 56 is a flexible scale with a minimum scale unit of 1mm. One end of the measuring tape 56 is fixed to the shaft of the scroll 53, and its free end passes through the annular shell 52 and the fixing block 42 and extends into the interior of the open pile body 2, and is connected to a gravity block 57. The gravity block 57 is made of stainless steel and has stable self-weight, which can ensure that the measuring tape 56 always remains in a vertical hanging state.

[0069] It should be noted that in the initial state, the gravity block 57 will cause the measuring tape 56 to extend a certain distance into the open pipe pile 2. At this time, the gravity block 57 has two key practical functions:

[0070] Firstly, the gravity block 57 forms a vertical line by its own weight. By observing whether the gravity block 57 is located in the center of the cavity of the open pipe pile 2, the verticality of the open pipe pile 2 in the experimental sand 11 inside the model box 1 can be quickly verified, thus avoiding the distortion of the soil plug accumulation shape and the distortion of measurement data caused by the tilt of the open pipe pile 2.

[0071] Secondly, in this embodiment, the self-weight of the gravity block 57 is limited to G=0.8N, and the preload of the spiral spring 55 is F=0.3N. During pile driving, the open pipe pile 2 is pressed down to inject sand. The sand flows into the pile, causing the top surface of the soil plug to rise and support the gravity block 57. The length of the measuring tape 56 reserved between the soil plug and the roller 53 bends to create an excess tape section. Under normal conditions, the self-weight of the gravity block 57 (0.8N) is greater than the preload of the spiral spring 55 (0.3N), pulling the measuring tape 56 downward to keep it taut. After the soil plug is lifted, the gravity block 57 is supported by the soil plug, and the spiral spring 55 automatically rotates and winds up the excess measuring tape 56 based on the preload. This ensures that the measuring tape 56 is taut throughout the entire process, avoiding reading errors caused by its looseness, bending, stacking, and curling, thus achieving accuracy in measuring the height of the soil plug.

[0072] Next, the pneumatic clutch assembly 6 is used to limit and fix the measuring assembly and retract and release it. It includes a ratchet 61, a pawl 62, a spring plate 63, a lever 64, a first support beam 65, a telescopic tube 66, a second support beam 67, and a second elastic element 68.

[0073] Specifically, the ratchet 61 is fixedly sleeved on the shaft of the scroll 53 located outside the annular shell 52, and rotates synchronously with the scroll 53. The pawl 62 is rotatably mounted on one side of the support plate 51 via a fixed shaft, and is correspondingly positioned on the tooth side of the ratchet 61. A spring plate 63 is fixedly mounted on the top of the pawl 62, and the spring plate 63 is mounted on the support plate 51 via a fixed shaft. Under normal conditions, the spring plate 63 presses against the pawl 62, keeping the pawl 62 engaged with the ratchet 61, thus achieving one-way self-locking of the scroll 53. A lever 64 is fixedly connected to the outside of the pawl 62, and the lever 64 is rotatably connected to the fixed shaft. The engagement and disengagement of the pawl 62 and the ratchet 61 can be controlled by the up-and-down swinging of the lever 64.

[0074] A sliding groove 511 is provided on the support plate 51. The first support beam 65 is slidably assembled on one side of the support plate 51 through the sliding groove 511. The first support beam 65 is located above the actuating rod 64, and a telescopic tube 66 is fixedly installed on the top of the first support beam 65. It should be noted that the top end of the telescopic tube 66 is connected to the connecting air pipe 43, and the bottom end is fixedly set on the upper surface of the first support beam 65. The telescopic end 661 of the telescopic tube 66 is located at the end close to the first support beam 65, and can extend and retract as the air passage is filled and depressurized to achieve the same effect, thereby pushing the actuating rod 64 to swing up and down.

[0075] The second support beam 67 is fixedly installed below the sliding groove 511 and directly below the actuating rod 64. Multiple sets of second elastic elements 68 are evenly arranged on the upper surface of the second support beam 67. In this embodiment, two sets are preferred. The second elastic elements 68 are preferably compression springs. Under normal conditions, they push the first support beam 65 upward. When the telescopic tube 66 is inflated and extended, it overcomes the elastic force of the second elastic elements 68 and presses the actuating rod 64 downward, causing the pawl 62 to swing and disengage from the ratchet 61, thus releasing the lock of the scroll 53. When the telescopic tube 66 is depressurized and retracted, the second elastic elements 68 rebound and push up the first support beam 65, and the pawl 62 resets and engages again, thus re-realizing the self-locking.

[0076] Application Examples

[0077] This embodiment, based on the aforementioned experimental measurement device for the soil plug effect in sandy soil pipe piles, conducts an indoor static pressure pile driving model experiment on open-face pipe piles in sandy soil strata. It measures the height of the soil plug accumulation inside the pipe pile at different driving depths, exploring the formation, growth, and compaction evolution of the soil plug during pile driving. This provides experimental data support for calculating the bearing capacity of open-face pipe piles and optimizing pile driving construction in practical engineering. The specific steps are as follows:

[0078] 1. Soil plug height measurement structure positioning and installation

[0079] The open-ended pipe pile 2 is vertically placed inside the sand in the model box 1. The soil plug height measuring structure is aligned with the top of the open-ended pipe pile 2. The inflatable balloon 41 is manually and repeatedly pressed, and outside air is unidirectionally injected into the inflatable balloon through the one-way air inlet 412. The air pressure inside the balloon increases and pushes open the sealing block 442 of the air inlet 44. The gas passes through the connecting cylinder 411 and the connecting air pipe 43 into the annular fixed air bag 421 outside the fixed block 42. The fixed air bag expands radially and adheres to the inner wall of the open-ended pipe pile 2 to achieve circumferential clamping, completing the coaxial fixation of the measuring device and the pipe pile. At the same time, some gas in the connecting air pipe 43 enters the telescopic tube 66. Pressing down the actuating rod 64 causes the pawl 62 to swing and disengage from the ratchet 61. The measuring tape 56 is positioned a certain distance below. By observing the spatial position of the gravity block 57 inside the pile, it is determined whether the verticality of the open-ended pipe pile 2 meets the standard.

[0080] 2. Measurement of height of static pressure pile driving and soil plug

[0081] When the open-ended pipe pile 2 is pressed down, the sand on the outside flows into the inner cavity of the pile along the bottom opening and accumulates to form a soil plug. The top surface of the soil plug rises and slowly approaches the gravity block 57, and lifts the gravity block 57 upward. The measuring tape 56 passively generates a surplus section, and the spiral spring 55 is stretched. Relying on the pre-tightening force, the surplus tape is continuously wound up, so that the bottom surface of the gravity block 57 is always in contact with the upper surface of the soil plug, and the measuring tape 56 is kept taut. When the open-ended pipe pile 2 is pressed down to the preset position, the actual height of the soil plug can be calculated directly from the reading on the measuring tape 56.

[0082] 3. Disassemble after the experiment

[0083] Turn on the ball valve of the exhaust component 45 to quickly exhaust the gas inside the air pipe 43 and the fixed air bag 421. The fixed air bag 421 radially contracts to release the tight constraint with the inner wall of the open pipe pile 2. Then, pull the soil plug height measuring structure directly upward as a whole.

[0084] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An experimental measurement device for the soil plugging effect of sand pipe piles, characterized in that, include: Model box (1), filled with experimental sand (11); Open-end pipe piles (2) are vertically arranged inside the model box (1) to simulate the pile driving conditions in sandy soil strata; The soil plug height measuring structure is detachably installed on the top of the open pipe pile (2), including a base shell (3), a positioning mechanism (4) and a measuring mechanism.

2. The experimental measurement device for the soil plugging effect of sand pipe piles according to claim 1, characterized in that, The positioning mechanism (4) includes: An inflatable balloon (41) is located above the base shell (3), and a connecting tube (411) is connected to its bottom. An air inlet (44) is provided inside the connecting tube (411), and an exhaust (45) is provided on one side of the connecting tube (411). A fixing block (42) is fixedly installed at the bottom of the base shell (3), and a fixing airbag (421) is sleeved on its outer side. The connecting tube (43) is connected at one end to the connecting tube (411) and at the other end to the fixed airbag (421).

3. The experimental measurement device for the soil plugging effect of sand pipe piles according to claim 2, characterized in that, The air intake component (44) includes: The fixing plate (441) is located inside the connecting cylinder; The sealing block (442) is slidably disposed at the connection between the inflatable balloon (41) and the connecting tube (411); The first elastic element (443) is connected at one end to the fixed plate (441) and at the other end to the sealing block (442).

4. The experimental measuring device for the soil plugging effect of sand pipe piles according to claim 3, characterized in that, The measuring mechanism includes: The measuring component (5) is set inside the base shell (3) and is used to measure the height of the soil plug inside the open pipe pile (2); The pneumatic clutch assembly (6) is located on one side of the measuring assembly (5) and is used to limit and fix the measuring assembly (5) and retract and release it.

5. The experimental measuring device for the soil plugging effect of sand pipe piles according to claim 4, characterized in that, The measurement component (5) includes: The support plate (51) is fixedly installed on one side of the inner wall of the base shell (3), and an annular shell (52) is fixedly installed on the other side. The spool (53) is rotatably mounted on the inner wall of the annular shell (52) at one end and extends to the outer side of the base shell (3) and is connected to a rotating knob (54). A spiral spring (55) is provided at the end of the spool (53) located inside the annular shell (52). The measuring tape (56) is wound on the spool (53), and its free end extends from the annular shell (52) and is connected to a gravity block (57).

6. The experimental measuring device for the soil plugging effect of sand pipe piles according to claim 5, characterized in that, The pneumatic clutch assembly (6) includes: The ratchet (61) is fitted onto the outside of the annular shell (52) of the spool (53); A pawl (62) is rotatably mounted on one side of a ratchet (61), and a spring plate (63) is provided on it. A lever (64) is fixedly mounted on one side of the pawl (62); The first support beam (65) is slidably disposed on one side of the support plate (51) and located above the actuating rod (64). A telescopic tube (66) is disposed on it, and one end of the telescopic tube (66) is connected to the connecting air pipe (43). The second support beam (67) is fixedly installed on one side of the support plate (51) and located below the toggle lever (64), and its upper surface is provided with a plurality of second elastic elements (68).

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