Device and method for correcting displacement of top cap of displacement rod

By designing the displacement rod top cap displacement correction device, the correction value is calculated to correct the displacement error by using the induction panel, magnetic artboard and angle sensor, and solving the measurement error problem caused by the non-vertical displacement direction in the self-balancing foundation pile bearing capacity test, improving the measurement accuracy and engineering safety and stability.

CN119843720APending Publication Date: 2025-04-18SHANDONG TRANSPORTATION INST
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Patent Information

Application Number
CN202411787113.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-06
Publication Date
2025-04-18

AI Technical Summary

Technical Problem

In the self-balancing method foundation pile bearing capacity test, the up and down displacement direction of the displacement rod is difficult to ensure that it is vertical, resulting in errors in the measurement result and affecting the safety and stability of the project.

Method used

A displacement rod top cap displacement correction device is designed, including a base, an induction panel, a magnetic artboard and an angle sensor. The slip value of the displacement meter end head on the magnetic artboard and the tilt angle change of the induction panel are recorded through the displacement meter, and the correction value is calculated to correct the displacement error.

Benefits of technology

It effectively improves measurement accuracy, reduces errors, and ensures the accuracy of foundation pile bearing capacity testing and the safety and stability of the project.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a displacement correction device and method for a top cap of a displacement rod, belongs to the technical field of foundation pile bearing capacity test engineering based on a self-balancing method, and aims to solve the technical problem of how to correct a displacement test value of the displacement rod, improve the measurement precision and further achieve the purpose of engineering safety and stability. Fastening edges distributed at intervals are arranged on the outer side face of the base, an induction panel is arranged on the upper end face of the base, the center of the lower side face of the induction panel is fixedly connected with the base, a magnetic drawing board is arranged on the upper side face of the induction panel, and scratches are left on the surface of the magnetic drawing board through the end of a displacement meter; and an angle sensor is arranged in the sensing panel and is used for sensing the change of the inclination angle of the sensing panel. The method specifically comprises the following steps: S1, mounting a displacement rod top cap displacement correction device; s2, mounting a displacement meter; s3, carrying out a self-balancing test; s4, judging stability according to the corrected data; and S6, recovering the displacement rod top cap displacement correction device.
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Description

Technical Field

[0001] The invention relates to the technical field of self-balancing pile bearing capacity testing engineering, in particular to a displacement rod top cap displacement correction device and method. Background Art

[0002] In order to improve the bearing capacity of the foundation in foundation engineering, concrete bored piles are often used in the design. The pile quality and pile body integrity of concrete bored piles are important guarantees for the bearing capacity of the pile foundation. For the vertical bearing capacity test of the existing larger concrete bored pile body, the commonly used test methods for the bearing capacity of existing piles are the pile loading method and the self-balancing method. In some special areas, due to the influence of factors such as foundation bearing capacity, spatial area, and design limit value, some pile foundations are not suitable for vertical bearing capacity testing using the pile loading method.

[0003] In the process of using the self-balancing method to test the vertical bearing capacity of the foundation piles, the self-balancing equipment needs to be embedded before pouring. During the test, the displacement of the embedded displacement rod is used to determine the loading state of the foundation piles. Since the displacement rod cannot be kept in a vertical state during the embedding process, it is difficult to ensure that the up and down displacement direction of the displacement rod is vertical during the test, which brings errors to the measurement results.

[0004] Therefore, how to correct the displacement test value of the displacement rod and improve the measurement accuracy to achieve the goal of engineering safety and stability is a technical problem that needs to be solved urgently. Summary of the invention

[0005] The technical task of the present invention is to provide a displacement correction device and method for a displacement rod top cap to solve the problem of how to correct the displacement test value of the displacement rod, improve the measurement accuracy, and thus achieve the purpose of engineering safety and stability.

[0006] The technical task of the present invention is achieved in the following way: a displacement correction device for a displacement rod top cap includes a base, the outer side surface of the base is provided with spaced fastening ribs, the upper end surface of the base is provided with a sensing panel, the center position of the lower side surface of the sensing panel is fixedly connected to the base, the upper side surface of the sensing panel is provided with a magnetic drawing board, and the end of the displacement meter leaves scratches on the surface of the magnetic drawing board; an angle sensor is provided in the sensing panel, and the angle sensor is used to sense the change of the tilt angle of the sensing panel. Among them, the upper side surface of the sensing panel is a circular plane, and the magnetic drawing board is installed on the circular plane.

[0007] Preferably, the sensing panel is arranged perpendicular to the base.

[0008] More preferably, a strip opening is provided on the outer side surface of the base, the strip opening is axially distributed along the outer side surface of the base and extends from the bottom of the outer side surface of the base to a position close to the upper middle portion of the outer side surface of the base.

[0009] More preferably, the base is in the shape of a truncated cone that is wider at the top and narrower at the bottom.

[0010] More preferably, the base is made of an acrylic hollow plastic frustum.

[0011] More preferably, the displacement meter is installed at the center of the circle on the upper side of the sensing panel 1 .

[0012] A displacement correction method for a displacement rod top cap, the method is specifically as follows:

[0013] S1. Install the displacement correction device for the displacement rod top cap: insert the base into the upper displacement rod or the lower displacement rod. During the insertion of the upper displacement rod or the lower displacement rod, the strip opening is compressed. As the insertion depth increases, the bottom of the strip opening is compressed to close. The fastening ribs prevent the displacement correction device for the displacement rod top cap from being squeezed upward. The displacement correction device for the displacement rod top cap is installed.

[0014] S2. Install the displacement meter: fix the displacement meter on the upper part of the displacement correction device of the displacement rod top cap through the reference beam, so that the bottom of the displacement meter is aligned with the center of the sensing panel; after fixing the displacement meter, turn on the displacement meter, start reading, and record the inclination angle of the sensing panel at this time;

[0015] S3. Self-balancing test: After the self-balancing test begins, the upper displacement rod in the pile will move upward, and the lower displacement rod in the pile will move downward. Since the upper and lower displacement rods are easily bent into an arc during the construction process, the upper and lower displacement directions are not vertical. At this time, the displacement recorded by the displacement meter is the vertical displacement, not the actual displacement, so the displacement is corrected and calculated. The formula is as follows:

[0016]

[0017] Among them, c represents the displacement correction value (actual displacement) of the upper displacement rod and the lower displacement rod, and c is a positive number; a represents the slip value of the displacement meter end on the magnetic drawing board; b represents the displacement value actually measured by the displacement meter; B represents the change in the inclination angle of the sensing panel before and after the test; a, b, and B values ​​are obtained from actual measurements;

[0018] S4. Determine stability based on corrected data: Refer to relevant specifications and determine the stability and ultimate bearing capacity of the piles based on the corrected displacement values;

[0019] S6. Recover the displacement correction device of the displacement rod top cap: after the test is completed, pull out the base from the upper displacement rod and the lower displacement rod, and restore the scratch on the upper part of the magnetic drawing board to its pre-use state after use, and finally store the displacement correction device of the displacement rod top cap into the storage box.

[0020] Preferably, the upper displacement rod and the lower displacement rod are both hollow metal round tubes, and the diameters of the upper displacement rod and the lower displacement rod match the diameter of the base.

[0021] More preferably, a hydraulic jack is installed at the bottom of the foundation pile, two parallel lower displacement rods are installed at the bottom of the hydraulic jack, and two parallel upper displacement rods are installed at the top of the hydraulic jack, one end of the upper displacement rod and the lower displacement rod is installed on the hydraulic jack, and the other end of the upper displacement rod and the lower displacement rod extends out of the foundation pile and is connected to the base.

[0022] More preferably, the hydraulic top is connected with an oil pressure pipe, one end of the oil pressure pipe is connected with the hydraulic top, and the other end of the oil pressure pipe is connected with a pressure pump.

[0023] The displacement rod top cap displacement correction device and method of the present invention have the following advantages:

[0024] (1) The base of the present invention is a hollow acrylic plastic truncated cone with fastening ribs, which is wide at the top and narrow at the bottom, so that the base is not easy to be pulled out after installation;

[0025] (ii) The base of the present invention is provided with a strip opening, which helps the base to better penetrate the upper displacement rod and the lower displacement rod, and increases the adaptability range of the base size;

[0026] (iii) The sensing panel of the present invention is a circular plane with a magnetic drawing board on the surface. The relative sliding of the displacement meter end on the drawing board can produce scratches, and the scratches can be removed by magnetic attraction after the test is completed, and the panel can be reused;

[0027] (iv) The inductive panel of the invention is internally installed with an angle sensor, which can sense the change of the inclination angle of the upper inductive surface and provide a basis for actual measurement values ​​for data correction.

[0028] The invention has the characteristics of reasonable design, simple structure, easy processing, small size, convenient use, multi-purpose, etc., and therefore has good promotion and use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention is further described below in conjunction with the accompanying drawings.

[0030] Attached Figure 1 It is a structural schematic diagram of the displacement correction device of the displacement rod top cap;

[0031] Attached Figure 2 It is a structural schematic diagram of a magnetic drawing board;

[0032] Attached Figure 3 It is a schematic diagram of the self-balancing test process;

[0033] Attached Figure 4 This is a schematic diagram of the structure for installing the displacement meter;

[0034] Attached Figure 5It is a schematic diagram of the structure of the foundation pile, the upper displacement rod and the lower displacement rod.

[0035] In the figure: 1. Sensing panel, 2. Fastening ribs, 3. Base, 4. Strip opening, 5. Magnetic drawing board, 6. Displacement meter, 7. Angle sensor, 8. Upper displacement rod, 9. Lower displacement rod, 10. Reference beam, 11. Foundation piles, 12. Hydraulic jack, 13. Oil pressure pipe, 14. Pressure pump. DETAILED DESCRIPTION

[0036] The displacement rod top cap displacement correction device and method of the present invention are described in detail below with reference to the accompanying drawings and specific embodiments of the specification.

[0037] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Implementation: 1:

[0040] As attached Figure 1 and 2 As shown, this embodiment provides a displacement correction device for the displacement rod top cap, and its structure includes a base 3, the outer side surface of the base 3 is provided with spaced fastening ribs 2, the upper end surface of the base 3 is installed with a sensing panel 1, the center position of the lower side surface of the sensing panel 1 is fixedly connected to the base 3, and the upper side surface of the sensing panel 1 is installed with a magnetic drawing board 5, and the end of the displacement meter 6 leaves scratches on the surface of the magnetic drawing board 5; the sensing panel 1 is installed with an angle sensor 7, and the angle sensor 7 is used to sense the change of the tilt angle of the sensing panel 1. Among them, the upper side surface of the sensing panel 1 is a circular plane, and the magnetic drawing board 5 is installed on the circular plane.

[0041] In this embodiment, the sensing panel 1 and the base 3 are arranged perpendicularly.

[0042] In this embodiment, a strip opening 4 is provided on the outer side of the base 3 , and the strip opening 4 is axially distributed along the outer side of the base 3 and extends from the bottom of the outer side of the base 3 to the upper middle of the outer side of the base 3 .

[0043] The base 3 in this embodiment is in the shape of a truncated cone that is wide at the top and narrow at the bottom.

[0044] The base 3 in this embodiment is made of an acrylic hollow plastic truncated cone.

[0045] The displacement meter 6 in this embodiment is installed at the center of the circle on the upper side of the sensing panel 1 .

[0046] Embodiment 2:

[0047] This embodiment provides a displacement correction method for a displacement rod top cap, and the method is specifically as follows:

[0048] S1. Install the displacement correction device for the displacement rod top cap in Example 1: insert the base 3 into the upper displacement rod 8 or the lower displacement rod 9. During the insertion of the upper displacement rod 8 or the lower displacement rod 9, the strip opening 4 is compressed. As the insertion depth increases, the bottom of the strip opening 4 is compressed to close. The fastening ribs 2 prevent the displacement correction device for the displacement rod top cap from being squeezed upward. The displacement correction device for the displacement rod top cap is installed.

[0049] S2. Install displacement meter 6: as attached Figure 4 As shown, the displacement meter is fixed to the upper part of the displacement correction device of the displacement rod top cap in Example 1 through the reference beam 10, so that the bottom of the displacement meter 6 is aligned with the center of the sensing panel 1; after the displacement meter is fixed, the displacement meter 6 is turned on, and the reading is started, and the inclination angle of the sensing panel at this time is recorded;

[0050] S3. Self-balancing test: After the self-balancing test starts, the upper displacement rod 8 in the pile 11 will move upward, and the lower displacement rod 9 in the pile 11 will move downward. Since the upper displacement rod 8 and the lower displacement rod 9 are easily bent into an arc during the construction process, the upper and lower displacement directions are not vertical. At this time, the displacement recorded by the displacement meter 6 is the vertical displacement, not the actual displacement. Therefore, the displacement amount is corrected and calculated, as shown in the attached figure. Figure 3 As shown, the formula is as follows:

[0051]

[0052] Wherein, c represents the displacement correction value (actual displacement) of the upper displacement rod 8 and the lower displacement rod 9, and c is a positive number; a represents the slip value of the end of the displacement meter 6 on the magnetic drawing board 5; b represents the displacement value actually measured by the displacement meter 6; B represents the change in the inclination angle of the sensing panel 1 before and after the test; the values ​​of a, b, and B are obtained from actual measurements;

[0053] S4. Determine stability based on the corrected data: refer to relevant specifications and determine the stability and ultimate bearing capacity of the pile 11 based on the corrected displacement value;

[0054] S6. Recover the displacement correction device of the displacement rod top cap: after the test is completed, pull out the base 3 from the upper displacement rod 8 and the lower displacement rod 9, and restore the scratched upper part of the magnetic drawing board 5 to its pre-use state after use, and finally store the displacement correction device of the displacement rod top cap in Example 1 into the storage box.

[0055] In this embodiment, the upper displacement rod 8 and the lower displacement rod 9 are both hollow metal round tubes, and the diameters of the upper displacement rod 8 and the lower displacement rod 9 match the diameter of the base 3 .

[0056] As attached Figure 5 As shown, a hydraulic jack 12 is installed at the bottom of the foundation pile 11 in this embodiment, two lower displacement rods 9 are installed at the bottom of the hydraulic jack 12 in parallel, and two upper displacement rods 8 are installed at the top of the hydraulic jack 12 in parallel. One end of the upper displacement rod 8 and the lower displacement rod 9 are installed on the hydraulic jack 12, and the other ends of the upper displacement rod 8 and the lower displacement rod 9 extend out of the foundation pile 11 and are connected to the base 3. A hydraulic pipe 13 is connected to the hydraulic jack 12, one end of the hydraulic pipe 13 is connected to the hydraulic jack 12, and the other end of the hydraulic pipe 13 is connected to the pressure pump 14.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A displacement rod top cap displacement correction device, characterized in that: It includes a base, the outer side surface of the base is provided with spaced fastening ribs, the upper end surface of the base is provided with a sensing panel, the center position of the lower side of the sensing panel is fixedly connected to the base, the upper side of the sensing panel is provided with a magnetic drawing board, and scratches are left on the surface of the magnetic drawing board through the end of the displacement meter; an angle sensor is provided in the sensing panel, and the angle sensor is used to sense the change of the tilt angle of the sensing panel.

2. The displacement rod top cap displacement correction device according to claim 1, characterized in that: The sensing panel is arranged perpendicularly to the base.

3. The displacement rod top cap displacement correction device according to claim 1 or 2, characterized in that: The outer side of the base is provided with a strip opening, which is axially distributed along the outer side of the base and extends from the bottom of the outer side of the base to a position close to the upper middle of the outer side of the base.

4. The displacement rod top cap displacement correction device according to claim 3, characterized in that: The base is in the shape of a truncated cone which is wide at the top and narrow at the bottom.

5. The displacement rod top cap displacement correction device according to claim 4, characterized in that: The base is made of an acrylic hollow plastic round table.

6. The displacement rod top cap displacement correction device according to claim 5, characterized in that: The displacement meter is installed at the center of the circle on the upper side of the sensing panel 1 .

7. A displacement correction method for a displacement rod top cap, characterized in that: The method is as follows: S1. Install the displacement correction device for the displacement rod cap as described in any one of claims 1 to 6: insert the base into the upper displacement rod or the lower displacement rod. During the insertion of the upper displacement rod or the lower displacement rod, the strip opening is compressed. As the insertion depth increases, the bottom of the strip opening is compressed to close. The fastening ribs prevent the displacement correction device for the displacement rod cap from being squeezed upward. The displacement correction device for the displacement rod cap is installed. S2. Install the displacement meter: fix the displacement meter on the upper part of the displacement correction device of the displacement rod top cap described in any one of claims 1 to 6 through the reference beam, so that the bottom of the displacement meter is aligned with the center of the sensing panel; after the displacement meter is fixed, turn on the displacement meter, start reading, and record the inclination angle of the sensing panel at this time; S3. Self-balancing test: After the self-balancing test begins, the upper displacement rod in the pile will move upward, and the lower displacement rod in the pile will move downward. Since the upper and lower displacement rods are easily bent into an arc during the construction process, the upper and lower displacement directions are not vertical. At this time, the displacement recorded by the displacement meter is the vertical displacement, not the actual displacement, so the displacement is corrected and calculated. The formula is as follows: Among them, c represents the displacement correction value of the upper displacement rod and the lower displacement rod, and c is a positive number; a represents the slip value of the displacement meter end on the magnetic drawing board; b represents the displacement value actually measured by the displacement meter; B represents the change in the inclination angle of the sensing panel before and after the test; a, b, and B values ​​are obtained from actual measurements; S4. Determine stability based on corrected data: Determine the stability and ultimate bearing capacity of the pile according to the corrected displacement value; S6. Recover the displacement correction device for the displacement rod top cap described in any one of claims 1-6: After the test is completed, pull out the base from the upper displacement rod and the lower displacement rod, and restore the scratches on the upper part of the magnetic drawing board to its pre-use state after use, and finally store the displacement correction device for the displacement rod top cap described in any one of claims 1-6 into the storage box.

8. The displacement correction method for the displacement rod top cap according to claim 7, characterized in that: The upper displacement rod and the lower displacement rod are both hollow metal round tubes, and the diameters of the upper displacement rod and the lower displacement rod match the diameter of the base.

9. The displacement correction method for the displacement rod top cap according to claim 7 or 8, characterized in that: A hydraulic jack is installed at the bottom of the foundation pile, two parallel lower displacement rods are installed at the bottom of the hydraulic jack, and two parallel upper displacement rods are installed at the top of the hydraulic jack. One end of the upper displacement rod and the lower displacement rod is installed on the hydraulic jack, and the other end of the upper displacement rod and the lower displacement rod extends out of the foundation pile and is connected to the base.

10. The displacement correction method for the displacement rod top cap according to claim 9, characterized in that: The hydraulic top is connected with an oil pressure pipe, one end of the oil pressure pipe is connected with the hydraulic top, and the other end of the oil pressure pipe is connected with a pressure pump.