A device for measuring sediment at the bottom of a bridge pile hole

Abstract

The present invention relates to a bridge pile hole bottom sediment measuring device applied to the bridge pile hole measuring field, comprising a measuring cake, a measuring needle, an auxiliary measuring mechanism and an intelligent measuring device; the auxiliary measuring mechanism comprises a double-axis motor installed on one side of a guide cylinder, a sleeve rotatably connected to the bottom of the measuring cake, a plurality of stirring blades evenly fixed along the outer ring of the sleeve, and a pressure plate connected to the top of the measuring needle; the intelligent measuring device is provided with a reminder module and an auxiliary measuring module; with the above structure, when the measuring cake falls to the top of the sediment, the double-axis motor is automatically controlled by the intelligent measuring device to drive forward and reversely, so as to achieve the effect of stirring the sediment at the bottom of the measuring cake, so as to facilitate the smooth insertion of the measuring needle into the sediment when the measuring cake rotates in the reverse direction, so that the measuring needle is not easily affected during the insertion process of the measuring needle into the bottom of the sediment, and the auxiliary measuring module is used to automatically determine the insertion state of the measuring needle, so as to realize the automation and intelligence of the detection, and the sediment thickness can be obtained by reading the insertion depth of the measuring needle.

Description

Technical Field

[0001] The invention relates to a sediment measuring device, in particular to a bridge pile hole bottom sediment measuring device applied in the technical field of bridge pile hole measurement. Background Art

[0002] Bridge construction requires drilling pile holes first, and burying bridge columns in the pile holes or casting bridge columns in the pile holes. The quality of the pile holes is directly related to the overall quality of the bridge. The quality of the pile holes includes two aspects: the quality of the pile body and the quality of the hole. During the construction process, in order to ensure the stability of the pile holes, mud with a certain specific gravity that meets the on-site geological conditions must be prepared and injected into the pile holes to protect the walls and prevent the soil on the hole walls from collapsing. During the drilling process, a large amount of impurities such as gravel and micro-sand will be suspended in the wall-protecting mud, and will gradually sink to form sediment at the bottom of the hole. If these sediments are thick, they will affect the construction quality of the cast-in-place piles.

[0003] The specification of Chinese invention patent CN113251975A discloses a pile hole sediment thickness detection device and detection method, the scheme includes a measuring cake and a measuring needle, the measuring cake and the measuring needle are respectively connected with a measuring rope, the measuring needle is perpendicular to the measuring cake and slidably penetrates the measuring cake, a fixed block is slidably arranged on one side of the measuring cake, the fixed block is slidably arranged on the measuring cake in a direction close to or away from the measuring needle, a plurality of grooves along its circumference are provided on the outer wall of the measuring needle, and the plurality of grooves are distributed along the axial direction of the measuring needle, a tooth matching with the groove is arranged on the side of the fixed block close to the measuring needle, and a driving component for driving the fixed block to slide until the tooth is engaged with the groove and a limiting component for limiting the tooth from being disengaged from the groove are also arranged on the measuring cake; it uses the top of the sediment contacted by the measuring cake as the base surface, and then inserts the measuring needle into the bottom of the sediment to measure the sediment thickness.

[0004] When the above scheme is implemented, due to the complex sediment situation at the bottom of the pile hole, after the test cake falls onto the sediment, the measuring needle is inserted into the bottom of the sediment. It may be blocked by large particles or small stones in the sediment, causing the measuring needle to fail to effectively penetrate the sediment and contact the bottom of the pile hole, thereby affecting the measurement results. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that after the test cake falls onto the sediment, the measuring needle inserted into the bottom of the sediment may be blocked by large particles or small stones in the sediment, resulting in the measuring needle being unable to effectively penetrate the sediment and contact the bottom of the pile hole, thereby affecting the measurement results.

[0006] In order to solve the above problems, the present invention provides a device for measuring sediment at the bottom of a bridge pile hole, which comprises: A measuring cake, the upper end of which is connected to a pulling rope, and a guide cylinder is vertically provided through the middle of the measuring cake; A measuring needle, which is vertically inserted into the guide cylinder; Auxiliary measuring mechanism, the auxiliary measuring mechanism includes a double-axis motor installed on one side of the guide cylinder, a sleeve 1 rotatably connected to the bottom of the measuring cake, a plurality of stirring blades evenly fixed along the outer ring of the sleeve 1, and a pressure plate connected to the top of the measuring needle. The top output shaft of the double-axis motor is threadedly connected to the pressure plate through an upper screw rod. The bottom output shaft of the double-axis motor is equipped with a lower rotating shaft that passes through the measuring cake. The end of the lower rotating shaft is linked to the sleeve 1 through a gear ring group. A pressure sensor is installed between the pressure plate and the top of the measuring needle. An intelligent measuring device is placed at the operating surface at the top of the bridge pile hole. The intelligent measuring device is provided with a reminder module and an auxiliary measurement module. The auxiliary measurement module is electrically connected to the reminder module, the pressure sensor and the dual-axis motor respectively. A pressure threshold is preset in the auxiliary measurement module. When measuring sediment in bridge pile holes, a control signal is sent to the dual-axis motor through the auxiliary measurement module to control the dual-axis motor to rotate forward first and then reversely. During the reverse rotation of the dual-axis motor, the measuring needle gradually moves to the bottom of the sediment, and the pressure sensor detects the pressure value and sends it to the auxiliary measurement module. The auxiliary measurement module compares the pressure value with the pressure threshold, and when it determines that the measuring needle has contacted the hard layer at the bottom of the sediment, the auxiliary measurement module sends a stop signal to the dual-axis motor and a reminder signal to the reminder module. The reminder module issues a corresponding sound and light reminder. After receiving the reminder, the staff pulls the measuring cake to the ground through the pulling rope, and determines the thickness of the sediment by reading the insertion depth of the measuring needle, so as to complete the measurement of the sediment thickness in the bridge pile hole.

[0007] In the above-mentioned bridge pile hole bottom sediment measuring device, when the test cake falls to the top of the sediment, the intelligent measuring device automatically controls the forward and reverse driving of the dual-axis motor to achieve the effect of stirring the sediment at the bottom of the test cake, so that the measuring needle can be smoothly inserted into the sediment when it rotates in the reverse direction, making it easier for the measuring needle to be inserted into the bottom of the sediment. The auxiliary measurement module is used to automatically determine the insertion status of the measuring needle, thereby improving the accuracy of the detection, and the sediment thickness can be more accurately measured by reading the insertion depth of the measuring needle.

[0008] As a further improvement of the present application, the axes of the sleeve 1 and the guide cylinder are the same, the upper section of the upper screw is the optical axis section, and a limiting disk is fixed on the top of the upper screw.

[0009] As a further improvement of the present application, scale lines are provided on the measuring needle, and indicating arrows are provided on the top surface of the guide cylinder at positions corresponding to the scale lines.

[0010] As another improvement of the present application, a plurality of limit blocks are distributed circumferentially on the top of the measuring cake, each limit block is connected with a push rod in the radial direction of the measuring cake, a push block is fixed to the end of the push rod away from the guide tube, and a toggle mechanism is installed on the measuring cake for pushing the push rod to move radially along the measuring cake.

[0011] As another improved supplement of the present application, the toggle mechanism includes a sleeve 2 which is sleeved with the guide cylinder, a toggle bevel block which is fixed to the outer ring of the sleeve 2 and arranged corresponding to the push rod, and a stepper motor installed on the guide cylinder. The output shaft of the stepper motor is linked to the sleeve 2 through a gear ring group, and the contact surface between the toggle bevel block and the push rod is inclined.

[0012] As another improved supplement of the present application, a center limit module is also provided on the intelligent measuring device, and the center limit module is electrically connected to the auxiliary measurement module and the stepping motor respectively.

[0013] As another improvement of the present application, a sliding groove is provided on the push rod, a sliding block is fixedly connected to the limit block and is slidably connected to the sliding groove, an elastic member is installed in the sliding groove, two ends of the elastic member are respectively fixedly connected to the inner wall of the sliding groove and the sliding block, and a groove is provided at the corresponding position of the bevel block and the lower rotating shaft.

[0014] As a further improvement of the present application, sleeve 1 and stirring blades are placed in the concave surface at the bottom of the measuring cake, and the bottom of the pulling rope is provided with no less than three connection points, and the bottom connection points of the pulling rope are evenly distributed along the circumference of the measuring cake.

[0015] To summarize, when the test cake falls to the top of the sediment, the intelligent measuring device automatically controls the forward and reverse driving of the dual-axis motor to achieve the effect of stirring the sediment at the bottom of the test cake, and the sleeve is driven to rotate by the lower shaft, and the sediment at the bottom of the test cake is stirred together with the water by the stirring blades, which can stir some large particles of impurities, and the measuring needle is smoothly inserted into the sediment when the dual-axis motor rotates in the opposite direction, so that the measuring needle is not easily affected during the insertion process of the bottom of the sediment, and then the measuring needle is assisted by the reverse driving control of the lower shaft to insert the measuring needle into the bottom of the sediment, and the pressure sensor is used to detect whether the measuring needle contacts the hard layer at the bottom of the sediment, so that the measuring needle is accurately inserted into the bottom of the sediment, so that the sediment thickness can be more accurately measured by the insertion depth of the measuring needle, and the intelligent measuring device is used to realize the automation and intelligence of the detection, thereby improving the accuracy of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The overall structure of the first and second embodiments of the present application is shown in FIG. Figure 1 ; Figure 2 The overall structure of the first and second embodiments of the present application is shown in FIG. Figure 2 ; Figure 3The structure diagram of the first and second embodiments of the present application after the push rod is extended Figure 1 ; Figure 4 The structure diagram of the first and second embodiments of the present application after the push rod is extended Figure 2 ; Figure 5 This is a control principle block diagram of an intelligent measuring device according to the first embodiment of the present application; Figure 6 It is a partial structural schematic diagram of the first and second implementation modes of the present application; Figure 7 The position diagram of sleeve 1 and sleeve 2 of the second embodiment and the second embodiment of the present application is shown in FIG. Figure 1 ; Figure 8 The position diagram of sleeve 1 and sleeve 2 of the second embodiment and the second embodiment of the present application is shown in FIG. Figure 2 ; Fig. 9 This is a block diagram of the control principle of the intelligent measuring device according to the second embodiment of the present application.

[0017] Description of the numbers in the figure: 1. Measuring cake; 2. Measuring needle; 3. Guide cylinder; 4. Pull rope; 5. Intelligent measuring device; 6. Sleeve 2; 7. Sliding bevel block; 8. Limit block; 9. Ejector rod; 10. Ejector block; 11. Elastic part; 12. Scale line; 13. Pressing plate; 14. Upper screw; 15. Sleeve 1; 16. Stirring blade; 17. Stepper motor; 18. Dual-axis motor; 19. Lower shaft; 20. Groove. DETAILED DESCRIPTION

[0018] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0019] The first implementation method: Figure 1-Figure 5 and Figure 7-Figure 8 A device for measuring sediment at the bottom of a bridge pile hole is shown, which includes a measuring cake 1, a measuring needle 2, an auxiliary measuring mechanism and an intelligent measuring device 5; a lifting rope 4 is connected to the upper end of the measuring cake 1, and a guide cylinder 3 is vertically penetrated through the middle of the measuring cake 1; the measuring needle 2 is vertically inserted into the guide cylinder 3, and the staff holds or uses a reel to control the lifting rope 4 to gradually send the measuring cake 1 to the bottom of the pile hole, so that the bottom of the measuring cake 1 contacts the top of the sediment. At this time, the upper end of the measuring needle 2 is located at the top of the guide cylinder 3 with a length L, and the measuring needle 2 is inserted into the bottom of the sediment. At this time, the upper end of the measuring needle 2 is located at the top of the guide cylinder 3 with a length D, and the sediment thickness is obtained by calculating the difference between L and D.

[0020] It is worth mentioning that the auxiliary measuring mechanism includes a double-axis motor 18 installed on one side of the guide cylinder 3, a sleeve 15 rotatably connected to the bottom of the measuring cake 1, a plurality of stirring blades 16 evenly fixed along the outer ring of the sleeve 15, and a pressure plate 13 connected to the top of the measuring needle 2. The top output shaft of the double-axis motor 18 is threadedly connected to the pressure plate 13 through an upper screw 14, and the bottom output shaft of the double-axis motor 18 is equipped with a lower rotating shaft 19 that penetrates the measuring cake 1. The end of the lower rotating shaft 19 is linked to the sleeve 15 through a gear ring set. A pressure sensor is installed between the pressure plate 13 and the top of the measuring needle 2. When the measuring cake 1 falls to the top of the sediment, the position of the measuring cake 1 is limited by tightening and binding the pulling rope 4, and the lower rotating shaft 19 is controlled to rotate forward by starting the double-axis motor 18. The lower rotating shaft 19 drives the sleeve 15 to rotate, and through The stirring blades 16 stir the sediment at the bottom of the test cake 1 together with the water, and can stir some large particles of impurities, so that the measuring needle 2 is not easily affected during the insertion process of the bottom of the sediment. At this time, the top non-threaded section of the upper screw 14 contacts the pressure plate 13, and will not control the displacement of the pressure plate 13; after the dual-axis motor 18 rotates forward for a certain period of time, it rotates reversely. At this time, the lower shaft 19 drives the sleeve 15 and the stirring blades 16 to continuously stir the water and sediment, reducing the impact of the sediment on the downward movement of the measuring needle 2 after it settles. During this process, the upper screw 14 will drive the pressure plate 13 to move downward, and assist in inserting the measuring needle 2 to the bottom of the sediment, and detect through the pressure sensor whether the measuring needle 2 contacts the hard layer at the bottom of the sediment, so that the measuring needle 2 can be accurately inserted into the bottom of the sediment, so that the sediment thickness can be more accurately measured through the insertion depth of the measuring needle 2.

[0021] In addition, when the test cake 1 falls to the top of the sediment, since the test cake 1 is supported by the bottom sediment, the lifting rope 4 is in a relaxed state. The operator judges that the test cake 1 has fallen to the top of the sediment at this time, and can limit the position of the test cake 1 by tightening the lifting rope 4 and binding it, so that when the sleeve 15 drives the stirring blade 16 to stir the sediment, the test cake 1 is not easy to continue to fall, thereby reducing the impact on the measurement result.

[0022] In addition, the intelligent measuring device 5 is placed on the operating surface at the top of the bridge pile hole. The intelligent measuring device 5 is provided with a reminder module and an auxiliary measurement module. The auxiliary measurement module is electrically connected to the reminder module, the pressure sensor and the dual-axis motor 18 respectively. A pressure threshold is preset in the auxiliary measurement module. The pressure threshold is the pressure value detected by the pressure sensor when the measuring needle 2 contacts the hard layer. When measuring the sediment of the bridge pile hole, the measuring cake 1 is put into the top of the sediment by the lifting rope 4, and the position of the measuring cake 1 is limited by binding the lifting rope 4. At this time, the auxiliary measurement module sends a control signal to the dual-axis motor 18 to control the dual-axis motor 18 to rotate forward for a specified time and then reversely. When the dual-axis motor 18 rotates forward, the lower shaft 19 drives the sleeve 15 at the bottom to rotate, and drives the stirring blade 16 to stir the sediment at the bottom of the measuring cake 1, and at the same time stirs some large particles of impurities, so that the measuring needle 2 is not easily affected during the insertion into the bottom of the sediment. When the dual-axis motor 18 rotates reversely, the lower shaft 19 drives the sleeve 15 and the stirring blade 16 to rotate. The moving blades 16 continuously stir the water and sediment to reduce the influence of the sediment on the downward movement of the measuring needle 2 after it settles. During this process, the upper screw 14 will drive the pressure plate 13 to move downward continuously, drive the pressure plate 13 to move downward continuously and synchronously move the measuring needle 2 gradually to the bottom of the sediment. During the continuous downward movement of the measuring needle 2, the pressure sensor continuously sends the received pressure value to the auxiliary measurement module. The auxiliary measurement module compares the pressure value with the pressure threshold to determine whether the pressure value increases to the pressure threshold. If the result is no, the auxiliary measurement module continuously controls the dual-axis motor 18 to make the measuring needle 2 move downward continuously; if the result is yes, the auxiliary measurement module controls the dual-axis motor 18 to stop working to keep the position of the measuring needle 2 stationary. At this time, the bottom of the measuring needle 2 contacts the hard layer at the bottom of the sediment, and at the same time sends a reminder signal to the reminder module. The reminder module sends a corresponding sound and light reminder to remind the staff to pull the measuring cake 1 to the ground through the pull rope 4. At this time, the staff determines the thickness of the sediment by reading the insertion depth of the measuring needle 2 to complete the measurement of the sediment thickness in the bridge pile hole.

[0023] In this implementation, see Figure 1 and Figure 2 The axes of the sleeve 15 and the guide cylinder 3 are the same, that is, the sleeve 15 is sleeved on the outer ring of the guide cylinder 3, so that the sediment at the corresponding position of the measuring needle 2 can be stirred by the rotating sleeve 15 and the stirring blade 16, thereby reducing the influence of large particles on the insertion of the measuring needle 2. The upper section of the upper screw 14 is the optical axis section, and the top of the upper screw 14 is fixed with a limit plate. In the initial state, the pressure plate 13 is in contact with the optical axis section of the upper section of the upper screw 14. When the dual-axis motor 18 drives the upper screw 14 to rotate forward, the rotating upper screw 14 will not control the displacement of the pressure plate 13. When the upper screw 14 rotates reversely, it will be threadedly connected with the pressure plate 13 through a thread, so as to control the pressure plate 13 and the measuring needle 2 to move downward synchronously.

[0024] Preferably, see Figure 1 and Figure 3 , a scale line 12 is arranged on the measuring needle 2, and an indicating arrow is arranged on the top surface of the guide cylinder 3 at a position corresponding to the scale line 12. After the measurement is completed, the sediment measuring device is moved up to the ground, and the staff can indicate the reading of the scale line 12 by the indicating arrow, and quickly read the sediment thickness, thereby improving the measurement efficiency; a sleeve 15 and a stirring blade 16 are placed in the concave surface at the bottom of the measuring cake 1, that is, the sleeve 15 and the stirring blade 16 do not protrude from the bottom of the measuring cake 1, and are not likely to affect the stable contact between the measuring cake 1 and the top of the sediment. A number of not less than three connection points are arranged at the bottom of the pulling rope 4, and the bottom connection points of the pulling rope 4 are evenly distributed along the circumference of the measuring cake 1. The measuring cake 1 is moved up and down by the pulling rope 4 at multiple points, and the movement of the measuring cake 1 is stably controlled to make it run smoothly.

[0025] The second implementation method: Figure 1-Figure 4 , Figure 6 and Fig. 9 As shown, unlike the first embodiment, a plurality of limit blocks 8 are circumferentially distributed on the top of the measuring cake 1, each limit block 8 is inserted with a push rod 9 along the radial direction of the measuring cake 1, a push block 10 is fixed to the end of the push rod 9 away from the guide cylinder 3, and a toggle mechanism for pushing the push rod 9 to move radially along the measuring cake 1 is installed on the measuring cake 1. When the measuring cake 1 contacts the top surface of the sediment, the plurality of push rods 9 are controlled by the toggle mechanism to move radially along the measuring cake 1, and the push rods 9 push the push block 10 to contact the side wall of the pile hole, thereby gradually moving the measuring cake 1 to the middle of the pile hole, and limiting the position of the measuring cake 1, reducing its up and down displacement, and improving the measurement accuracy.

[0026] It is worth mentioning that the toggle mechanism includes a sleeve 2 6 sleeved with the guide cylinder 3, a toggle bevel block 7 fixed to the outer ring of the sleeve 2 6 and arranged corresponding to the push rod 9, and a stepper motor 17 installed on the guide cylinder 3. The output shaft of the stepper motor 17 is linked with the sleeve 2 6 through a gear ring group. The contact surface of the toggle bevel block 7 and the push rod 9 is inclined. The sleeve 2 6 is driven to rotate by the output shaft of the stepper motor 17, thereby driving multiple toggle bevel blocks 7 to move, so that the push rod 9 is extended forward by the moving toggle bevel block 7, and the push rod 9 is controlled to contact the side wall of the pile hole to locate the position of the measuring cake 1. The intelligent measuring device 5 is also provided with a center limit module. The center limit The modules are electrically connected to the auxiliary measuring module and the stepper motor 17 respectively. When the measuring cake 1 is controlled to move down to the top of the sediment by the lifting rope 4, the lifting rope 4 is in a relaxed state. At this time, the stepper motor 17 is controlled to work by the center limit module. The stepper motor 17 controls the corresponding sleeve 2 6 to rotate, so that the top block 10 is close to the side wall of the pile hole to fix the position of the measuring cake 1. At this time, the center limit module sends a measuring signal to the auxiliary measuring module, and the auxiliary measuring module controls the dual-axis motor 18 to work. By actively fixing the position of the measuring cake 1, the stirring blade 16 is not easy to affect the position of the measuring cake 1 when stirring the sediment, thereby improving the stability of the measuring cake 1 during the measurement process.

[0027] Also, see Figure 1 A slide groove is provided on the push rod 9, and a slider slidably connected to the slide groove is fixedly connected to the limit block 8. An elastic member 11 is installed in the slide groove, and the two ends of the elastic member 11 are respectively fixedly connected to the inner wall of the slide groove and the slider. The push rod 9 is controlled to extend forward by swinging the toggle block 7. After the toggle block 7 is reset, the push rod 9 can be pushed to reset by the elastic member 11. A groove 20 is provided at the corresponding position of the toggle block 7 and the lower rotating shaft 19. When the sleeve 2 6 controls the toggle block 7 to move, the lower rotating shaft 19 may affect the movement of the toggle block 7. A corresponding groove 20 can be provided on the toggle block 7, and the groove 20 is engaged with the lower rotating shaft 19 to prevent the lower rotating shaft 19 from affecting the operation of the toggle block 7.

[0028] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A device for measuring sediment at the bottom of a bridge pile hole, characterized in that: It includes: A measuring cake (1), wherein the upper end of the measuring cake (1) is connected to a pulling rope (4), and a guide cylinder (3) is vertically penetrated through the middle of the measuring cake (1); A measuring needle (2), the measuring needle (2) being vertically inserted into the guide cylinder (3); An auxiliary measuring mechanism, the auxiliary measuring mechanism comprising a double-axis motor (18) mounted on one side of the guide cylinder (3), a sleeve (15) rotatably connected to the bottom of the measuring cake (1), a plurality of stirring blades (16) evenly fixed along the outer ring of the sleeve (15), and a pressure plate (13) connected to the top of the measuring needle (2), the top output shaft of the double-axis motor (18) being threadedly connected to the pressure plate (13) via an upper screw (14), the bottom output shaft of the double-axis motor (18) being equipped with a lower rotating shaft (19) penetrating the measuring cake (1), the end of the lower rotating shaft (19) being linked to the sleeve (15) via a gear ring set, and a pressure sensor being installed between the pressure plate (13) and the top of the measuring needle (2); An intelligent measuring device (5), the intelligent measuring device (5) being placed at an operating surface at the top of a bridge pile hole, the intelligent measuring device (5) being provided with a reminder module and an auxiliary measurement module, the auxiliary measurement module being electrically connected to the reminder module, the pressure sensor and the dual-axis motor (18) respectively, and a pressure threshold being preset in the auxiliary measurement module; When measuring sediment in a bridge pile hole, a control signal is sent to the dual-axis motor (18) through the auxiliary measurement module to control the dual-axis motor (18) to rotate forward first and then reversely. During the reverse rotation of the dual-axis motor (18), the measuring needle (2) is gradually moved toward the bottom of the sediment. The pressure sensor detects a pressure value and sends it to the auxiliary measurement module. When the auxiliary measurement module compares the pressure value with a pressure threshold and determines that the measuring needle (2) has contacted the hard layer at the bottom of the sediment, the auxiliary measurement module sends a stop signal to the dual-axis motor (18) and a reminder signal to the reminder module. The reminder module sends a corresponding sound and light reminder. After receiving the reminder, the staff pulls the measuring cake (1) to the ground through the lifting rope (4) and determines the thickness of the sediment by reading the insertion depth of the measuring needle (2), thereby completing the measurement of the sediment thickness in the bridge pile hole.

2. A bridge pile hole bottom sediment measuring device according to claim 1, characterized in that: The axes of the sleeve 1 (15) and the guide cylinder (3) are the same, the upper section of the upper screw rod (14) is an optical axis section, and a limiting disk is fixed to the top of the upper screw rod (14).

3. A bridge pile hole bottom sediment measuring device according to claim 1, characterized in that: The measuring needle (2) is provided with a scale line (12), and an indicating arrow is provided on the top surface of the guide cylinder (3) at a position corresponding to the scale line (12).

4. A bridge pile hole bottom sediment measuring device according to claim 1, characterized in that: A plurality of limit blocks (8) are distributed circumferentially on the top of the measuring cake (1), each of the limit blocks (8) is plugged with a push rod (9) in the radial direction of the measuring cake (1), a push block (10) is fixed to one end of the push rod (9) away from the guide cylinder (3), and a toggle mechanism for pushing the push rod (9) to move in the radial direction of the measuring cake (1) is installed on the measuring cake (1).

5. A bridge pile hole bottom sediment measuring device according to claim 4, characterized in that: The toggle mechanism comprises a sleeve (6) sleeved with the guide cylinder (3), a toggle bevel block (7) fixed to the outer ring of the sleeve (6) and arranged corresponding to the push rod (9), and a stepper motor (17) mounted on the guide cylinder (3), wherein the output shaft of the stepper motor (17) is linked to the sleeve (6) via a gear ring set, and the contact surface of the toggle bevel block (7) and the push rod (9) is arranged to be inclined.

6. A bridge pile hole bottom sediment measuring device according to claim 5, characterized in that: The intelligent measuring device (5) is also provided with a center limit module, and the center limit module is electrically connected to the auxiliary measurement module and the stepping motor (17) respectively.

7. A bridge pile hole bottom sediment measuring device according to claim 6, characterized in that: The push rod (9) is provided with a slide groove, the limit block (8) is fixedly connected with a slider slidably connected to the slide groove, an elastic member (11) is installed in the slide groove, and the two ends of the elastic member (11) are respectively fixedly connected to the inner wall of the slide groove and the slider, and the toggle block (7) and the lower rotating shaft (19) are provided with a groove (20) at a position corresponding to the position.

8. The device for measuring sediment at the bottom of a bridge pile hole according to claim 1, characterized in that: The sleeve 1 (15) and the stirring blade (16) are placed in the concave surface at the bottom of the test cake (1), and the bottom of the pulling rope (4) is provided with no less than three connection points, and the bottom connection points of the pulling rope (4) are evenly distributed along the circumference of the test cake (1).

Images