Device and method for detecting sediment thickness before pile forming of cast-in-place pile

Abstract

The invention discloses a device and method for detecting the sediment thickness before pile forming of a cast-in-place pile, and relates to the technical field of constructional engineering test.The device comprises a bottom plate, four sets of supporting legs and a measuring assembly, the bottom plate is arranged above a pile hole, the four sets of supporting legs are fixedly connected to the four corners of the lower surface of the bottom plate, and positioning rods are detachably connected into the four sets of supporting legs; the measuring assembly is arranged on the lower surface of the bottom plate, a pay-off assembly is arranged on the upper surface of the bottom plate, the four sets of supporting legs are supported on the outer surface of a pile hole and then are positioned through positioning rods, then the measuring assembly is started, and the pay-off assembly moves downwards to detect the thickness of sediment while the measuring assembly drives the pay-off assembly to move downwards to detect the thickness of the sediment. According to the sediment detection device, detection data can be marked and calculated, the steering assembly can drive the pay-off assembly to change the position, other positions can be conveniently detected, and the effects that the sediment detection accuracy can be improved, and time and labor are saved are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of construction engineering testing, and in particular relates to a device and method for detecting the thickness of sediment before cast-in-place piles are formed. Background Art

[0002] In construction projects, bored piles are a commonly used foundation form. The quality of the piles directly affects the stability and safety of the entire structure. The thickness of the sediment before bored piles is one of the key factors affecting the quality of the piles.

[0003] The problem with the existing technology is that at present, when testing the sediment thickness of bored piles during construction, measures such as tying the steel bar head at the measuring end are generally adopted to test the sediment thickness at the bottom of the pile hole before pouring, and the sediment thickness at the bottom of the pile hole before pouring is judged by human feel and experience. This method has low accuracy, and there are large human differences and inaccuracies in the test data. Therefore, we propose a sediment thickness detection method before bored piles are formed. Summary of the invention

[0004] The object of the present invention is to provide a device and method for detecting the thickness of sediment before cast-in-place pile formation, so as to solve the problems raised in the above-mentioned background technology.

[0005] The present invention is implemented as follows: a device for detecting the thickness of sediment before cast-in-place piles are formed, comprising a base plate, legs and a measuring assembly, wherein the base plate is arranged above the pile hole, four groups of legs are fixedly connected to the four corners of the lower surface of the base plate, and positioning rods are detachably connected inside the four groups of legs. The measuring assembly is arranged on the lower surface of the base plate, a line-laying assembly is arranged on the upper surface of the base plate, and three groups of steering assemblies are arranged on the inner wall of the line-laying assembly, the line-laying assembly is used to place the measuring rope at the bottom of the pile hole, the steering assembly is used to recover the measuring rope and adjust the measuring position, and the measuring assembly is used to mark the line-laying situation during measurement.

[0006] As a preferred embodiment of the present invention, the line-releasing assembly includes a second gear, a movable shell and a first gear, the movable shell is fixedly connected to the upper surface of the base plate, the surface of the movable shell is movably connected to a movable plate, and the four sides of the movable plate are movably connected to rotating rods.

[0007] As a preferred embodiment of the present invention, the four groups of the first gears are respectively fixedly connected to one end of the four groups of rotating rod surfaces, the second gears are meshed and transmitted to the four groups of the first gear surfaces, and the four groups of rotating rod surfaces are all provided with pull ropes.

[0008] As a preferred embodiment of the present invention, one end of the four groups of pull ropes are fixedly connected to a release plate, the inside of the four groups of pull ropes are fixedly connected to measuring wires, and one end of the four groups of measuring wires are fixedly connected to a measuring rod.

[0009] As a preferred embodiment of the present invention, the steering assembly includes a push plate, a storage shell and a spring, three groups of the push plates are respectively fixedly connected to the surface of the second gear, three groups of the storage shells are respectively fixedly connected to the three sides of the inner wall of the movable plate, and three groups of baffles are fixedly connected to the upper surface of the base plate.

[0010] As a preferred embodiment of the present invention, the three groups of springs are respectively fixedly connected to one side of the inner wall of the three groups of storage shells, and one end of the three groups of springs is fixedly connected to a telescopic block, and the telescopic block is movably connected to the storage shell.

[0011] As a preferred embodiment of the present invention, the measuring assembly includes a motor, a rotating shaft and a marking rod, the motor is fixedly connected to the inside of the base plate, the second gear is fixedly connected to the output end of the motor, and the rotating shaft is movably connected to the other end of the motor.

[0012] As a preferred embodiment of the present invention, four groups of sliding rods are fixedly connected to the lower surface of the rotating shaft, one side of the surface of the four groups of sliding rods are provided with scales, the surface of the four groups of sliding rods are movably connected to sliders, and the four groups of marking rods are respectively fixedly connected to one side of the surface of the four groups of sliders.

[0013] A method for detecting the thickness of sediment before cast-in-place piles is applied to the above-mentioned device for detecting the thickness of sediment before cast-in-place piles, and comprises the following steps: S1, according to the method of use, can be divided into laying out, marking and transposition; S11, when laying out the line, the operation of the motor drives the second gear to rotate, so that the pull rope and the measuring line connecting the laying plate and the measuring rod are placed at the bottom of the pile hole by utilizing the rotation of the first gear; S12, when marking, after the plate and the measuring rod are moved to the appropriate position, the marking rod can be pulled and inserted into the measuring line for marking; S13, when changing position, the motor drives the second gear to rotate in the opposite direction, so as to pull the pull rope and the measuring line upward. After a period of time, the push plate pushes the telescopic block, so that the telescopic block drives the pull rope and the measuring line to move and change position by using the movable plate; S2, complete the operation steps corresponding to each usage method; S21, when the motor is running, it will drive the second gear to rotate, and the second gear will drive the four sets of first gears and the rotating rod to rotate, so that the pull rope and the measuring line on the surface of the rotating rod are lowered into the pile hole. When the release plate first contacts the sediment, the marking rod is used to mark the inside of the measuring line, and then the line is continuously released. When the measuring rod passes through the sediment and contacts the bottom of the pile hole, the marking rod is used to mark again, and finally the depth of the sediment is calculated. There are four sets of measuring rods and release plates, and the set with the largest depth can be selected; S22, when the motor drives the second gear to rotate in the opposite direction, the first gear will drive the rotating rod to rotate in the opposite direction, thereby lifting the pull rope and the measuring line for a certain distance. When the second gear continues to rotate, the push plate will contact the telescopic block, thereby driving the movable plate to rotate on the surface of the movable shell for a certain distance, thereby completing the switching of the pull rope and the measuring line position. When the push plate still pushes the movable plate to rotate, the telescopic block will contact the baffle plate. Because the surface of the baffle plate is an inclined surface, the telescopic block will be retracted into the storage shell. The spring is used to drive the telescopic block to reset, and then the telescopic block will be held against the baffle plate. At this time, the motor can be used to rotate forward again to measure several other positions. If no measurement is needed, the motor can be driven to rotate in the opposite direction, which can drive the pull rope and the measuring line to be reeled on the surface of the rotating rod. The three structural positions of the push plate, the telescopic block and the baffle plate are staggered and will not be stuck. S23, when the release plate first contacts the upper surface of the sediment, pull the marking rod to insert it inside the measuring line to mark it, and observe the scale to record it. When the line continues to be released so that the measuring rod contacts the bottom of the sediment, the marking rod will move down on the slide bar surface using the slider. At this time, observe the scale again to record it. The difference between the two times is the thickness of the sediment, and the rotating shaft can drive the four sets of marking rods to rotate so as to mark the sediment thickness at other positions.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention supports four groups of legs on the outer surface of the pile hole, positions them using a positioning rod, and then starts the measuring component. While driving the line-laying component to move downward to detect the thickness of the sediment, the measuring component can mark and calculate the detected data. The steering component can drive the line-laying component to change position, which is convenient for detecting other positions, thereby achieving the effect of improving the accuracy of sediment detection and saving time and effort.

[0015] 2. The present invention drives the second gear to rotate when the motor is running, and the second gear drives the four groups of first gears and the rotating rod to rotate, so that the pull rope and the measuring line on the surface of the rotating rod are lowered to the inside of the pile hole. When the release plate first contacts the sediment, the marking rod is used to mark the inside of the measuring line, and then the line is continuously released. When the measuring rod passes through the sediment and contacts the bottom of the pile hole, it is marked again with the marking rod, and finally the depth of the sediment is calculated. There are four groups of measuring rods and release plates, and the group with the largest depth can be taken, so as to achieve the effect of facilitating the measurement of the thickness of the sediment.

[0016] 3. The present invention enables the first gear to drive the rotating rod to rotate in the opposite direction when the motor drives the second gear to rotate in the opposite direction, thereby lifting the pull rope and the measuring line for a certain distance. When the second gear continues to rotate, the push plate will contact the telescopic block, thereby driving the movable plate to rotate a certain distance on the surface of the movable shell, thereby completing the switching of the positions of the pull rope and the measuring line. When the push plate still pushes the movable plate to rotate, the telescopic block will contact the baffle plate. Because the surface of the baffle plate is an inclined surface, the telescopic block will be retracted into the storage shell. The spring is used to drive the telescopic block to reset, and then the telescopic block will be supported by the baffle plate. At this time, the motor can be used to rotate forward again to measure several other positions. If no measurement is needed, the motor can continue to rotate in the opposite direction, which can drive the pull rope and the measuring line to be reeled on the surface of the rotating rod. The three structural positions of the push plate, the telescopic block and the baffle plate are staggered and will not get stuck, thereby achieving the effect of facilitating the replacement of the wire-releasing assembly and detecting sediment at other positions.

[0017] 4. The present invention pulls the marking rod to insert into the measuring line to mark when the release plate first contacts the upper surface of the sediment, and observes the scale to record. When the line is continued to be released to make the measuring rod contact the bottom of the sediment, the marking rod will move down on the slide bar surface using a slider. At this time, the scale is observed again to record. The difference between the two times is the thickness of the sediment, and the rotating shaft can drive the four groups of marking rods to rotate so as to mark the sediment thickness at other positions, thereby achieving the effect of facilitating marking and calculation of the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of a local structure provided by an embodiment of the present invention; Figure 3 is a schematic diagram of a movable shell structure provided by an embodiment of the present invention; Figure 4 It is a schematic diagram of the plate placement structure provided by an embodiment of the present invention; Figure 5 It is a schematic diagram of the push plate structure provided by an embodiment of the present invention; Figure 6 is a schematic diagram of the motor structure provided by an embodiment of the present invention; Figure 7 It is a schematic diagram of the marking rod structure provided by an embodiment of the present invention.

[0019] In the figure: 1. bottom plate; 2. measuring component; 201. motor; 202. rotating shaft; 203. marking rod; 204. sliding rod; 205. slider; 206. scale; 3. supporting leg; 4. positioning rod; 5. line-releasing component; 501. movable shell; 502. movable plate; 503. rotating rod; 504. first gear; 505. second gear; 506. pulling rope; 507. measuring line; 508. measuring rod; 509. releasing plate; 6. steering component; 601. pushing plate; 602. baffle; 603. storage shell; 604. spring; 605. telescopic block. DETAILED DESCRIPTION

[0020] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings.

[0021] The structure of the present invention is described in detail below in conjunction with the accompanying drawings.

[0022] Example: like Figures 1 to 7 As shown, a device for detecting the thickness of sediment before pile formation of a bored pile provided by an embodiment of the present invention comprises a base plate 1, legs 3 and a measuring assembly 2, the base plate 1 is arranged above the pile hole, four groups of legs 3 are fixedly connected to the four corners of the lower surface of the base plate 1, and the four groups of legs 3 are detachably connected with positioning rods 4 inside, the measuring assembly 2 is arranged on the lower surface of the base plate 1, a line-laying assembly 5 is arranged on the upper surface of the base plate 1, and three groups of steering assemblies 6 are arranged on the inner wall of the line-laying assembly 5, the line-laying assembly 5 is used to place the measuring rope at the bottom of the pile hole, the steering assembly 6 is used to recover the measuring rope and adjust the measuring position, and the measuring assembly 2 is used to mark the line-laying situation during measurement; The line-releasing assembly 5 includes a second gear 505, a movable shell 501 and a first gear 504. The movable shell 501 is fixedly connected to the upper surface of the bottom plate 1. The movable shell 501 surface is movably connected to a movable plate 502. The movable plate 502 has four sides movably connected to the inside thereof. The four sides of the movable plate 502 are movably connected to rotating rods 503. Four groups of first gears 504 are respectively fixedly connected to one end of the surface of four groups of rotating rods 503. The second gears 505 are meshed and transmitted to the surfaces of the four groups of first gears 504. The surfaces of the four groups of rotating rods 503 are all provided with pull ropes 506. One end of the four groups of pull ropes 506 are all fixedly connected to a release plate 509. The inside of the four groups of pull ropes 506 are all connected to measuring lines 507. One end of the four groups of measuring lines 507 are all fixedly connected to measuring rods 508. The steering assembly 6 includes a push plate 601, a storage shell 603 and a spring 604. The three push plates 601 are respectively fixedly connected to the surface of the second gear 505. The three storage shells 603 are respectively fixedly connected to the three sides of the inner wall of the movable plate 502. The upper surface of the bottom plate 1 is fixedly connected with three baffles 602. The three groups of springs 604 are respectively fixedly connected to one side of the inner wall of the three groups of storage shells 603, and one end of the three groups of springs 604 is fixedly connected to a telescopic block 605, and the telescopic block 605 is movably connected to the storage shell 603; the measuring component 2 includes a motor 201, a rotating shaft 202 and a marking rod 203, the motor 201 is fixedly connected to the inside of the base plate 1, the second gear 505 is fixedly connected to the output end of the motor 201, and the rotating shaft 202 is movably connected to the other end of the motor 201; four groups of sliding rods 204 are fixedly connected to the lower surface of the rotating shaft 202, and scales 206 are set on one side of the surface of the four groups of sliding rods 204, and sliders 205 are movably connected to the surface of the four groups of sliding rods 204, and the four groups of marking rods 203 are respectively fixedly connected to one side of the surface of the four groups of sliders 205.

[0023] The above scheme is adopted: after supporting the four groups of legs 3 on the outer surface of the pile hole, they are positioned using the positioning rod 4, and then the measuring component 2 is started. While driving the wire-laying component 5 to move downward to detect the thickness of the sediment, the measuring component 2 can mark and calculate the detected data. The steering component 6 can drive the wire-laying component 5 to change position, which is convenient for detecting other positions, thereby achieving the effect of improving the accuracy of sediment detection and saving time and effort.

[0024] When the motor 201 is running, it will drive the second gear 505 to rotate, and the second gear 505 will drive the four groups of first gears 504 and the rotating rod 503 to rotate, so that the pull rope 506 and the measuring line 507 on the surface of the rotating rod 503 are lowered to the inside of the pile hole. When the release plate 509 first contacts the sediment, the marking rod 203 is used to mark the inside of the measuring line 507, and then the line is continued to be released. When the measuring rod 508 passes through the sediment and contacts the bottom of the pile hole, it is marked again with the marking rod 203, and finally the depth of the sediment is calculated. There are four groups of measuring rods 508 and release plates 509, and the group with the largest depth can be taken, so as to achieve the effect of facilitating the measurement of the thickness of the sediment.

[0025] When the motor 201 drives the second gear 505 to rotate in the opposite direction, the first gear 504 drives the rotating rod 503 to rotate in the opposite direction, thereby lifting the pull rope 506 and the measuring line 507 for a certain distance. When the second gear 505 continues to rotate, the push plate 601 contacts the telescopic block 605, thereby driving the movable plate 502 to rotate on the surface of the movable shell 501 for a certain distance, thereby completing the switching of the positions of the pull rope 506 and the measuring line 507 through the rotation of the movable plate 502. When the push plate 601 still pushes the movable plate 502 to rotate, the telescopic block 605 contacts the baffle 602, because the surface of the baffle 602 is an inclined surface. Therefore, the telescopic block 605 will be retracted into the storage shell 603, and the spring 604 is used to drive the telescopic block 605 to reset, and then the telescopic block 605 will be held against the baffle 602. At this time, the motor 201 can be used to rotate forward again to measure other positions. If no measurement is needed, the motor 201 can be rotated in the reverse direction to drive the pull rope 506 and the measuring line 507 to be reeled on the surface of the rotating rod 503. The three structural positions of the push plate 601, the telescopic block 605 and the baffle 602 are staggered and will not get stuck, thereby facilitating the replacement of the line-releasing component 5 and thus detecting sediment at other positions.

[0026] When the release plate 509 first contacts the upper surface of the sediment, pull the marking rod 203 to insert it into the measuring line 507 to mark it, and observe the scale 206 for recording. When the line is continued to be released to make the measuring rod 508 contact the bottom of the sediment, the marking rod 203 will use the slider 205 to move down on the surface of the slide bar 204. At this time, observe the scale 206 again for recording. The difference between the two times is the thickness of the sediment, and the rotating shaft 202 can drive the four groups of marking rods 203 to rotate so as to mark the sediment thickness at other positions, thereby achieving the effect of facilitating the marking and calculation of the detection results.

[0027] like Figure 1-7 As shown, a method for detecting the thickness of sediment before the cast-in-place pile is applied to the above-mentioned device for detecting the thickness of sediment before the cast-in-place pile is formed, comprising the following steps; S1, according to the method of use, can be divided into laying out, marking and transposition; S11, when laying out the line, the operation of the motor 201 drives the second gear 505 to rotate, so that the first gear 504 is used to rotate to place the pull rope 506 and the measuring line 507 connecting the laying plate 509 and the measuring rod 508 at the bottom of the pile hole; S12, when marking, after the placing plate 509 and the measuring rod 508 are moved to a suitable position, the marking rod 203 can be pulled and inserted into the measuring line 507 for marking; S13, when changing positions, the motor 201 drives the second gear 505 to rotate in the opposite direction, so as to pull the pull rope 506 and the measuring line 507 upwards. After a period of time, the push plate 601 pushes the telescopic block 605, so that the telescopic block 605 drives the pull rope 506 and the measuring line 507 to move and change positions by using the movable plate 502; S2, complete the operation steps corresponding to each usage method; S21, when the motor 201 is running, it will drive the second gear 505 to rotate, and the second gear 505 will drive the four groups of first gears 504 and the rotating rod 503 to rotate, so that the pull rope 506 and the measuring line 507 on the surface of the rotating rod 503 are lowered to the inside of the pile hole. When the release plate 509 first contacts the sediment, the marking rod 203 is used to mark the inside of the measuring line 507, and then the line is continuously released. When the measuring rod 508 passes through the sediment and contacts the bottom of the pile hole, the marking rod 203 is used to mark again, and finally the depth of the sediment is calculated. There are four groups of measuring rods 508 and release plates 509, and the group with the largest depth can be selected; S22, when the motor 201 drives the second gear 505 to rotate in the opposite direction, the first gear 504 drives the rotating rod 503 to rotate in the opposite direction, thereby lifting the pull rope 506 and the measuring line 507 for a certain distance. When the second gear 505 continues to rotate, the push plate 601 contacts the telescopic block 605, thereby driving the movable plate 502 to rotate on the surface of the movable shell 501 for a certain distance, thereby completing the switching of the pull rope 506 and the measuring line 507. When the push plate 601 still pushes the movable plate 502 to rotate, the telescopic block 605 contacts the baffle 602, so that Because the surface of the baffle 602 is an inclined surface, the telescopic block 605 will be retracted into the storage shell 603, and the spring 604 is used to drive the telescopic block 605 to reset, and then the telescopic block 605 will be held against by the baffle 602. At this time, the motor 201 can be used to rotate forward again to measure other positions. If no measurement is needed, the motor 201 can be rotated in the reverse direction to drive the pull rope 506 and the measuring line 507 to be rolled up on the surface of the rotating rod 503, and the three structural positions of the push plate 601, the telescopic block 605 and the baffle 602 are staggered and will not get stuck. S23, when the release plate 509 first contacts the upper surface of the sediment, pull the marking rod 203 to insert it into the measuring line 507 to mark it, and observe the scale 206 for recording. When the line is continued to be released to make the measuring rod 508 contact the bottom of the sediment, the marking rod 203 will use the slider 205 to move down on the surface of the slide bar 204. At this time, observe the scale 206 again for recording. The difference between the two times is the thickness of the sediment, and the rotating shaft 202 can drive the four groups of marking rods 203 to rotate so as to mark the sediment thickness at other positions.

[0028] Working principle of the present invention: When in use, when the motor 201 is running, it will drive the second gear 505 to rotate, and the second gear 505 will drive the four sets of first gears 504 and the rotating rod 503 to rotate, so that the pull rope 506 and the measuring line 507 on the surface of the rotating rod 503 are lowered into the pile hole. When the release plate 509 first contacts the sediment, the marking rod 203 is used to mark the inside of the measuring line 507, and then the line is continuously released. When the measuring rod 508 passes through the sediment and contacts the bottom of the pile hole, the marking rod 203 is used to mark again. Finally, the depth of the sediment is calculated, and the measuring rod 508 and the release plate 509 are used to calculate the depth of the sediment. There are four groups in total, and the group with the largest depth can be selected. When the motor 201 drives the second gear 505 to rotate in the opposite direction, the first gear 504 drives the rotating rod 503 to rotate in the opposite direction, thereby lifting the pull rope 506 and the measuring line 507 for a distance. When the second gear 505 continues to rotate, the push plate 601 contacts the telescopic block 605, thereby driving the movable plate 502 to rotate for a distance on the surface of the movable shell 501, thereby completing the switching of the pull rope 506 and the measuring line 507. When the push plate 601 still pushes the movable plate 502 to rotate, the telescopic block 605 contacts the movable plate 502, thereby driving the movable plate 502 to rotate for a distance. The retractable block 605 contacts the baffle 602. Since the surface of the baffle 602 is an inclined surface, the retractable block 605 is retracted into the storage shell 603. The spring 604 is used to drive the retractable block 605 to reset. Then the retractable block 605 will be held against by the baffle 602. At this time, the motor 201 can be used to rotate forward again to measure several other positions. If no measurement is needed, the motor 201 can be rotated in the reverse direction to drive the pull rope 506 and the measuring line 507 to be rolled up on the surface of the rotating rod 503. The push plate 601, the retractable block 605 and the baffle 60 The three structural positions are staggered and will not get stuck. When the plate 509 first contacts the upper surface of the sediment, pull the marking rod 203 to insert it into the measuring line 507 to mark it, and observe the scale 206 for recording. When the line is continued to be released to make the measuring rod 508 contact the bottom of the sediment, the marking rod 203 will use the slider 205 to move down on the surface of the slide bar 204. At this time, observe the scale 206 again for recording. The difference between the two times is the thickness of the sediment, and the rotating shaft 202 can drive the four groups of marking rods 203 to rotate so as to mark the sediment thickness at other positions.

[0029] In summary: the device and method for detecting the sediment thickness of a bored pile before it is formed, through the structure of the measuring component 2, the motor 201, the rotating shaft 202, the marking rod 203, the sliding rod 204, the sliding block 205, and the scale 206, solves the problem that at present, when testing the sediment thickness of bored piles during construction, measures such as tying the steel bar head at the measuring end are generally adopted for testing, and the sediment thickness at the bottom of the pile hole before pouring is judged by human feel and experience. This method has low precision, and there are large human differences in the test data and inaccuracy in judgment.

[0030] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting the thickness of sediment before cast-in-place pile formation, comprising a base plate (1), legs (3) and a measuring assembly (2), characterized in that: The base plate (1) is arranged above the pile hole, the four groups of legs (3) are fixedly connected to the four corners of the lower surface of the base plate (1), the four groups of legs (3) are detachably connected with positioning rods (4) inside, the measuring assembly (2) is arranged on the lower surface of the base plate (1), the upper surface of the base plate (1) is provided with a line-laying assembly (5), the inner wall of the line-laying assembly (5) is provided with three groups of steering assemblies (6), the line-laying assembly (5) is used to place the measuring rope at the bottom of the pile hole, the steering assembly (6) is used to recycle the measuring rope and adjust the measuring position, and the measuring assembly (2) is used to mark the line-laying situation during measurement.

2. A device for detecting the thickness of sediment before cast-in-place pile formation as claimed in claim 1, characterized in that: The line-releasing assembly (5) comprises a second gear (505), a movable shell (501) and a first gear (504); the movable shell (501) is fixedly connected to the upper surface of the bottom plate (1); a movable plate (502) is movably connected to the surface of the movable shell (501); and rotating rods (503) are movably connected to the inside of four sides of the movable plate (502).

3. A device for detecting the thickness of sediment before cast-in-place pile formation as claimed in claim 2, characterized in that: The four groups of the first gears (504) are respectively fixedly connected to one end of the surface of the four groups of rotating rods (503), the second gears (505) are meshed and transmitted to the surfaces of the four groups of the first gears (504), and the surfaces of the four groups of rotating rods (503) are all provided with pull ropes (506).

4. A device for detecting the thickness of sediment before cast-in-place pile formation as claimed in claim 3, characterized in that: One end of each of the four groups of pull ropes (506) is fixedly connected to a release plate (509), the inside of each of the four groups of pull ropes (506) is fixedly connected to a measuring line (507), and one end of each of the four groups of measuring lines (507) is fixedly connected to a measuring rod (508).

5. A device for detecting the thickness of sediment before cast-in-place pile formation as claimed in claim 2, characterized in that: The steering assembly (6) comprises a push plate (601), a storage shell (603) and a spring (604); three groups of the push plates (601) are respectively fixedly connected to the surface of the second gear (505); three groups of the storage shells (603) are respectively fixedly connected to three sides of the inner wall of the movable plate (502); and three groups of baffles (602) are fixedly connected to the upper surface of the bottom plate (1).

6. A device for detecting the thickness of sediment before cast-in-place pile formation as claimed in claim 5, characterized in that: The three groups of springs (604) are respectively fixedly connected to one side of the inner wall of the three groups of storage shells (603); one end of the three groups of springs (604) is fixedly connected to a telescopic block (605); the telescopic block (605) and the storage shell (603) are movably connected.

7. A device for detecting the thickness of sediment before cast-in-place pile formation as claimed in claim 3, characterized in that: The measuring assembly (2) comprises a motor (201), a rotating shaft (202) and a marking rod (203); the motor (201) is fixedly connected to the inside of the base plate (1); the second gear (505) is fixedly connected to the output end of the motor (201); and the rotating shaft (202) is movably connected to the other end of the motor (201).

8. A device for detecting the thickness of sediment before cast-in-place pile formation as claimed in claim 7, characterized in that: Four groups of slide bars (204) are fixedly connected to the lower surface of the rotating shaft (202), one side of the surface of the four groups of slide bars (204) is provided with scales (206), the surface of the four groups of slide bars (204) is movably connected to sliders (205), and the four groups of marking rods (203) are respectively fixedly connected to one side of the surface of the four groups of sliders (205).

9. A method for detecting the thickness of sediment before cast-in-place piles, applied to a device for detecting the thickness of sediment before cast-in-place piles as claimed in any one of claims 1 to 8, characterized in that: The method comprises the following steps: S1, according to the method of use, can be divided into laying out, marking and transposition; S11, when laying out the line, the operation of the motor (201) drives the second gear (505) to rotate, so that the first gear (504) is used to rotate to place the pull rope (506) and the measuring line (507) connecting the laying plate (509) and the measuring rod (508) at the bottom of the pile hole; S12, during marking, after the placing plate (509) and the measuring rod (508) are moved to a suitable position, the marking rod (203) can be pulled and inserted into the measuring line (507) for marking; S13, when changing positions, the motor (201) drives the second gear (505) to rotate in the opposite direction, thereby pulling the pull rope (506) and the measuring line (507) upwards. After a period of time, the push plate (601) pushes the telescopic block (605), so that the telescopic block (605) drives the pull rope (506) and the measuring line (507) to move and change positions by using the movable plate (502); S2, complete the operation steps corresponding to each usage method; S21, when the motor (201) is running, it drives the second gear (505) to rotate, and the second gear (505) drives the four sets of first gears (504) and the rotating rod (503) to rotate, so that the pull rope (506) and the measuring line (507) on the surface of the rotating rod (503) are lowered into the pile hole. When the release plate (509) first contacts the sediment, the marking rod (203) is used to mark the inside of the measuring line (507), and then the line is continuously released. When the measuring rod (508) passes through the sediment and contacts the bottom of the pile hole, the marking rod (203) is used to mark again, and finally the depth of the sediment is calculated. There are four sets of measuring rods (508) and release plates (509), and the set with the largest depth can be selected; S22, when the motor (201) drives the second gear (505) to rotate in the opposite direction, the first gear (504) drives the rotating rod (503) to rotate in the opposite direction, thereby lifting the pull rope (506) and the measuring line (507) by a certain distance. When the second gear (505) continues to rotate, the push plate (601) contacts the telescopic block (605), thereby driving the movable plate (502) to rotate on the surface of the movable shell (501) by a certain distance, thereby completing the switching of the positions of the pull rope (506) and the measuring line (507). When the push plate (601) still pushes the movable plate (502) to rotate, the telescopic block (605) contacts the baffle (602). Because the surface of the baffle (602) is an inclined surface, the telescopic block (605) is retracted into the storage shell (603), and the spring (604) is used to drive the telescopic block (605) to reset. Then the telescopic block (605) will be held against the baffle (602). At this time, the motor (201) can be used to rotate forward again to measure other positions. If no measurement is required, the motor (201) can be rotated in the reverse direction to drive the pull rope (506) and the measuring line (507) to be rolled up on the surface of the rotating rod (503). In addition, the three structural positions of the push plate (601), the telescopic block (605) and the baffle (602) are staggered and will not get stuck. S23, when the plate (509) first contacts the upper surface of the sediment, pull the marking rod (203) to insert it into the measuring line (507) to mark it, and observe the scale (206) to record it. When the line is continued to be released so that the measuring rod (508) contacts the bottom of the sediment, the marking rod (203) will move down on the surface of the slide bar (204) using the slider (205). At this time, observe the scale (206) again to record it. The difference between the two times is the thickness of the sediment, and the rotating shaft (202) can drive the four groups of marking rods (203) to rotate so as to mark the sediment thickness at other positions.

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