Detection sensor positioning mechanism for low-strain detection of pile foundation

Abstract

The utility model discloses a detection sensor positioning mechanism for low strain detection of a pile foundation, which is characterized in that the periphery of the bottom of a positioning cylinder is provided with a boss, the lower surface of one side of the boss is provided with a first groove, one end of the upper surface of the boss, which is far away from the first groove, is provided with a shaft rod, and one end of a thin steel plate is provided with an L-shaped extension section; the L-shaped extending section is movably arranged in the first groove of the boss through a bolt, a cylindrical handle is arranged on the upper surface of the end, away from the bolt, of the thin steel plate, one end of the limiting buckle is rotationally connected with the shaft rod, a clamping groove is formed in the other end of the limiting buckle, and the limiting buckle is matched with the cylindrical handle through the clamping groove. The sensor for low-strain detection is inserted into the positioning cylinder, after the head of the sensor is coated with the adhesive, the sensor and the boss are pressed on the pile top of the pile foundation together, the stability of the sensor is greatly improved through cooperation of the positioning cylinder and the boss, the sensor can be perpendicular to the surface of the pile top as much as possible, and therefore the precision of detection data is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pile foundation low-strain detection sensor positioning, in particular to a detection sensor positioning mechanism for pile foundation low-strain detection. Background Art

[0002] The primary function of the low-strain reflection wave method is to verify the integrity of pile foundation structures, such as determining the location of pile defects, calibrating construction pile lengths, and qualitatively estimating concrete strength grades. Specifically, the pile top is struck with a hand hammer, a force hammer, or a force rod. The resulting stress wave propagates downward along the pile shaft at a wave velocity C. When the stress wave passes through an interface where the pile impedance z (Z:AC) changes (e.g., due to diameter reduction, foreign matter inclusion, concrete segregation, or diameter expansion), a portion of the stress wave is reflected and propagates upward, while another portion is transmitted downward to the pile end, where it is reflected again. An accelerometer or velocity sensor mounted on the pile top receives the reflected wave signal, which is then amplified and processed by a pile tester to produce an acceleration time history curve. The curve's morphology can be used to determine the location of impedance changes or verify pile length, and the average wave velocity can be used to estimate the concrete strength grade.

[0003] At present, the detection sensors (acceleration or velocity sensors) used for low-strain detection of pile foundations are generally directly coated and wrapped with adhesive on the head, and the detection sensors are manually bonded to the top of the pile with the adhesive. However, this method has low sensor stability during detection and it is difficult to make the sensor as vertical as possible, which may affect the detection accuracy. Therefore, an improved technology is urgently needed to solve this problem existing in the existing technology. Utility Model Content

[0004] The purpose of the present utility model is to provide a detection sensor positioning mechanism for low-strain detection of pile foundations. The sensor for low-strain detection is inserted into a positioning cylinder. After adhesive is applied to the sensor head, the sensor and the boss are pressed together onto the pile top of the pile foundation. Through the cooperation of the positioning cylinder and the boss, the stability of the sensor is greatly improved, so that the sensor can be as perpendicular as possible to the surface of the pile top, thereby improving the accuracy of the detection data and solving the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a detection sensor positioning mechanism for low-strain detection of pile foundations, comprising a positioning cylinder, a boss, a shaft rod, a thin steel plate, a columnar handle and a limit buckle, a boss is provided on the periphery of the bottom of the positioning cylinder, a first groove is provided on the lower surface of one side of the boss, a shaft rod is provided on the upper surface of the boss and away from one end of the first groove, an L-shaped extension section is provided at one end of the thin steel plate, the L-shaped extension section is movably arranged in the first groove of the boss by a bolt, the head of the bolt is arranged in the first groove of the boss, a columnar handle is provided on the upper surface of the thin steel plate away from one end of the bolt, one end of the limit buckle is rotatably connected to the shaft rod, and a slot is provided at the other end of the limit buckle, the limit buckle cooperates with the columnar handle through the slot, and the thin steel plate is rotatably arranged on the lower surface of the boss around the bolt.

[0006] Preferably, the utility model provides a detection sensor positioning mechanism for low-strain detection of pile foundations, wherein a screw is provided on the top of the shaft, and the screw on the top of the shaft cooperates with a limit nut.

[0007] Preferably, the present invention provides a detection sensor positioning mechanism for low-strain detection of pile foundations, wherein the L-shaped extension section is provided with a through hole, and the bolt is passed through the through hole.

[0008] Preferably, the utility model provides a detection sensor positioning mechanism for low-strain detection of pile foundations, wherein the boss is provided with a screw hole at the first groove, and the bolt cooperates with the screw hole.

[0009] Preferably, the present invention provides a detection sensor positioning mechanism for low-strain detection of pile foundations, wherein a second groove is further provided on the inner side of the boss, and the second groove is communicated with the interior of the positioning cylinder.

[0010] Preferably, the utility model provides a detection sensor positioning mechanism for low-strain detection of pile foundations, wherein a third groove is provided on the lower surface of the boss and located on one side of the first groove, the width of the thin steel plate is not greater than the width of the third groove, and the thickness of the thin steel plate is not greater than the depth of the third groove.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] (1) The sensor for low strain detection is inserted into the positioning cylinder. After the adhesive is applied to the sensor head, the sensor and the boss are pressed together on the top of the pile foundation. The coordination of the positioning cylinder and the boss greatly improves the stability of the sensor, so that the sensor can be as perpendicular to the pile top surface as possible, thereby improving the accuracy of the detection data.

[0013] (2) A first groove is provided on one side of the lower surface of the boss, and the thin steel plate is connected to the first groove of the boss through an L-shaped extension section and a bolt, so that the thin steel plate can rotate around the bolt. When the detection is completed, the adhesive on the sensor head can be cut off through the thin steel plate, thereby facilitating the sensor to be separated from the pile top.

[0014] (3) A limit buckle is also provided on the upper surface of the boss through a shaft, and the slot of the limit buckle can cooperate with the cylindrical handle on the upper surface of the thin steel plate, so that the thin steel plate will not swing when stored. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the utility model;

[0016] Figure 2 For attachment Figure 1 Schematic diagram of the top view structure;

[0017] Figure 3 It is a schematic diagram of the cross-sectional structure of the positioning cylinder and boss;

[0018] Figure 4 It is a schematic diagram of the side structure of the thin steel plate;

[0019] Figure 5 It is a schematic diagram of the top view of the thin steel plate structure;

[0020] Figure 6 This is a schematic diagram of the top view of the structure of the utility model (the thin steel plate is opened);

[0021] Figure 7 This is a schematic diagram of the bottom-up structure of the utility model (with the thin steel plate opened);

[0022] Figure 8 This is a schematic diagram of the working state of the utility model.

[0023] In the figure: positioning cylinder 1, boss 2, shaft 3, thin steel plate 4, cylindrical handle 5, limit buckle 6, first groove 7, L-shaped extension section 8, slot 9, limit nut 10, bolt 11, through hole 12, screw hole 13, second groove 14, third groove 15. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0025] It should be noted that, in the description of the present invention, the terms "inside", "outside", "up", "down", "both sides", "one end", "the other end", "left", "right", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the present invention.

[0026] See also Figure 1-7 The utility model provides a technical solution: a detection sensor positioning mechanism for low-strain detection of pile foundations, including a positioning cylinder 1, a boss 2, a shaft rod 3, a thin steel plate 4, a columnar handle 5 and a limit buckle 6. A boss 2 is provided on the periphery of the bottom of the positioning cylinder 1, and a first groove 7 is provided on the lower surface of one side of the boss 2. The shaft rod 3 is provided on the upper surface of the boss 2 and away from the end of the first groove 7. An L-shaped extension section 8 is provided at one end of the thin steel plate 4. The L-shaped extension section 8 is movably arranged in the first groove 7 of the boss 2 through a bolt 11. The L-shaped extension section 8 is provided with a through hole 12. The bolt 11 is passed through the through hole 12 to achieve the matching connection between the L-shaped extension section 8 and the bolt 11. The head of the bolt 11 is arranged in the first groove 7 of the boss 2. The boss 2 is provided with a screw hole 13 at the first groove 7. The bolt 11 cooperates with the screw hole 13 to achieve the connection between the bolt 11 and the boss 2. The thin steel plate 4 is away from the bolt 11 The upper surface of one end is provided with a cylindrical handle 5, and one end of the limiting buckle 6 is rotatably connected to the shaft rod 3. A screw is provided at the top of the shaft rod 3, and the screw at the top of the shaft rod 3 cooperates with the limiting nut 10, and the limiting nut 10 is used to limit the limiting buckle 6. A slot 9 is provided at the other end of the limiting buckle 6, and the limiting buckle 6 cooperates with the cylindrical handle 5 through the slot 9. The thin steel plate 4 is rotatably set around the bolt 11 and is arranged on the lower surface of the boss 2. A second groove 14 is also provided on the inner side of the boss 2, and the second groove 14 is communicated with the inside of the positioning cylinder 1. The second groove 14 is provided to ensure that the adhesive has a certain extension space after the sensor head is coated with the adhesive, thereby ensuring that the sensor can be smoothly bonded to the top of the pile. A third groove 15 is also provided on the lower surface of the boss 2 and is located on one side of the first groove 7. The width of the thin steel plate 4 is not greater than the width of the third groove 15, and the thickness of the thin steel plate 4 is not greater than the depth of the third groove 15.

[0027] Assembly method and operating principle: Place the L-shaped extension section 8 of the thin steel plate 4 into the first groove 7 of the boss 2 and pass the bolt 11 through the through hole 12 of the L-shaped extension section 8. At the same time, screw the bolt 11 into the screw hole 13 of the first groove 7, so that the L-shaped extension section 8 is confined in the first groove 7. At this time, the thin steel plate 4 can rotate around the bolt 11. Then, one end of the limit buckle 6 is rotatably connected to the shaft 3 and limited by the limit nut 10. At this time, the limit buckle 6 can rotate around the shaft 3, completing the assembly. When storing, rotate the thin steel plate 4 to the bottom of the boss 2. At this time, rotate the limit buckle 6 and make the slot 9 of the limit buckle 6 engage with the cylindrical handle 5, so that the thin steel plate 4 cannot rotate. When in use, the cylindrical handle 5 is disengaged from the slot 9 of the limit buckle 6, and then the thin steel plate 4 is rotated to move the cylindrical handle 5 to the other end of the boss 2. The thin steel plate 4 leaves the second groove 14 of the boss 2 and is located in the third groove 15. At this time, the lower surface of the boss 2 is in close contact with the top of the pile. The speed sensor is passed through the positioning sleeve, and then the adhesive is applied to the head of the sensor. Then, the boss 2 and the head of the sensor are pressed against the top of the pile foundation. The positioning mechanism ensures the stability of the sensor. Figure 8 Finally, a hammer strikes the pile top, and the sensor receives the reflected wave signal. The pile tester then amplifies the signal and processes it to produce an acceleration-time curve. The curve's morphology allows the location of impedance changes or pile length verification, while the average wave velocity allows for estimation of the concrete strength grade. After testing, grasp the cylindrical handle 5 and rotate the thin steel plate 4, cutting the adhesive away from the pile top to remove the sensor. The utility model has a reasonable structure. The sensor for low strain detection is inserted into the positioning cylinder 1. After the adhesive is applied to the sensor head, the sensor and the boss 2 are pressed together on the pile top of the pile foundation. Through the cooperation of the positioning cylinder 1 and the boss 2, the stability of the sensor is greatly improved, so that the sensor can be as perpendicular to the pile top surface as possible, thereby improving the accuracy of the detection data. At the same time, a first groove 7 is provided on one side of the lower surface of the boss 2, and the thin steel plate 4 is connected to the first groove 7 of the boss 2 through the L-shaped extension section 8 and the bolt 11, so that the thin steel plate 4 can rotate around the bolt 11. Through the thin steel plate 4, when the detection is completed, it is convenient to cut off the adhesive on the sensor head and to facilitate the separation of the sensor from the pile top. A limiting buckle 6 is also provided on the upper surface of the boss 2 through the shaft 3. The slot 9 of the limiting buckle 6 can cooperate with the cylindrical handle 5 on the upper surface of the thin steel plate 4, so that the thin steel plate 4 will not swing when it is stored.

[0028] Anything not described in detail in the present invention is well known to those skilled in the art.

[0029] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified and replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A detection sensor positioning mechanism for low-strain detection of pile foundations, characterized by: The present invention comprises a positioning cylinder (1), a boss (2), a shaft (3), a thin steel plate (4), a columnar handle (5) and a limit buckle (6), wherein the outer periphery of the bottom of the positioning cylinder (1) is provided with a boss (2), a first groove (7) is provided on the lower surface of one side of the boss (2), a shaft (3) is provided on the upper surface of the boss (2) and away from the first groove (7), an L-shaped extension section (8) is provided at one end of the thin steel plate (4), and the L-shaped extension section (8) is movably provided on the boss (2) by a bolt (11). ), the head of the bolt (11) is arranged in the first groove (7) of the boss (2), the upper surface of the thin steel plate (4) away from one end of the bolt (11) is provided with a columnar handle (5), one end of the limit buckle (6) is rotatably connected to the shaft (3), and the other end of the limit buckle (6) is provided with a slot (9), the limit buckle (6) cooperates with the columnar handle (5) through the slot (9), and the thin steel plate (4) is rotatably arranged around the bolt (11) on the lower surface of the boss (2).

2. The detection sensor positioning mechanism for pile foundation low strain detection according to claim 1, characterized in that: A screw rod is provided at the top of the shaft rod (3), and the screw rod at the top of the shaft rod (3) cooperates with a limiting nut (10).

3. The detection sensor positioning mechanism for pile foundation low strain detection according to claim 1, characterized in that: The L-shaped extension section (8) is provided with a through hole (12), and the bolt (11) is passed through the through hole (12).

4. The detection sensor positioning mechanism for low-strain detection of pile foundations according to claim 1, characterized in that: The boss (2) is provided with a screw hole (13) at the first groove (7), and the bolt (11) is matched with the screw hole (13).

5. The detection sensor positioning mechanism for pile foundation low strain detection according to claim 1, characterized in that: A second groove (14) is also provided on the inner side of the boss (2), and the second groove (14) is communicated with the interior of the positioning cylinder (1).

6. The detection sensor positioning mechanism for pile foundation low strain detection according to claim 1, characterized in that: A third groove (15) is further provided on the lower surface of the boss (2) and located on one side of the first groove (7); the width of the thin steel plate (4) is not greater than the width of the third groove (15); and the thickness of the thin steel plate (4) is not greater than the depth of the third groove (15).

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