Low-strain dynamic measurement method pile foundation detecting and positioning device

Abstract

The utility model discloses a low-strain dynamic measurement method pile foundation detecting and positioning device which comprises a supporting frame and a measuring assembly, the supporting frame comprises a plurality of supporting rods and a top frame jointly connected to the top ends of the supporting rods, a rotating rod is rotationally arranged on the top frame, and the measuring assembly comprises a measuring sleeve rod, a measuring sliding rod and a measuring vertical plate. One end of the measuring sleeve rod is horizontally arranged on the rotating rod, the measuring sliding rod is slidably connected to the end, away from the rotating rod, of the measuring sleeve rod, length scale marks are arranged on the measuring sliding rod in the length direction of the measuring sliding rod, the measuring vertical plate is vertically arranged at the end, away from the rotating rod, of the measuring sliding rod, and the measuring vertical plate is vertically slidably connected with the measuring sliding rod. The pile foundation detection method has the effect of improving the pile foundation detection efficiency.

Description

Technical Field

[0001] This application relates to the technical field of pile foundation testing, and in particular to a low-strain dynamic pile foundation testing positioning device. Background Technology

[0002] The main methods for pile foundation testing include static load testing, core drilling, low-strain method, high-strain method, and sonic logging. Low-strain dynamic testing is suitable for detecting the integrity of concrete piles and determining the degree and location of pile defects. Low-strain reflection testing involves applying an excitation signal to the pile top to generate a stress wave, which is received by a sensor installed at the pile top. As this stress wave propagates along the pile, it generates reflected waves when it encounters discontinuities or the bottom surface of the pile. By detecting and analyzing the propagation time, amplitude, phase, and waveform characteristics of the reflected waves, information such as pile length and the location of pile defects can be obtained, ultimately evaluating the integrity of the foundation pile.

[0003] Currently, different installation requirements exist for the vibration excitation point and sensor installation point for different types of pile foundation testing. For solid pile testing, the sensor installation point should be located at 2 / 3 of the radius from the center of the pile top. For hollow pile foundations, the angle between the line connecting the vibration excitation point to the pile center and the line connecting the sensor installation point to the pile center should be 90 degrees, and the sensor should be installed at 1 / 2 of the pile wall thickness.

[0004] Regarding the aforementioned technologies, the inventors believe that during the low-strain testing of the aforementioned pile foundations, it is necessary to use measuring tools to determine the center of the pile top and measure its location, depending on the specific requirements, which reduces the efficiency of the testing process. Utility Model Content

[0005] To improve the efficiency of pile foundation testing, this application provides a low-strain dynamic pile foundation testing positioning device.

[0006] The low-strain dynamic pile foundation testing and positioning device provided in this application adopts the following technical solution:

[0007] A low-strain dynamic testing and positioning device for pile foundation detection includes a support frame and a measuring assembly. The support frame includes several support rods and a top frame connected to the top of the support rods. A rotating rod is rotatably mounted on the top frame. The measuring assembly includes a measuring sleeve, a measuring slide rod, and a measuring vertical plate. One end of the measuring sleeve is horizontally mounted on the rotating rod. The measuring slide rod is slidably connected to the end of the measuring sleeve away from the rotating rod. Length graduations are provided on the measuring slide rod along its length. The measuring vertical plate is vertically mounted on the end of the measuring slide rod away from the rotating rod, and the measuring vertical plate is vertically slidably connected to the measuring slide rod.

[0008] By adopting the above technical solution, the support frame is placed on the ground at the top of the pile foundation, with the position of the rotating rod corresponding to the central axis of the pile foundation. First, the measuring vertical plate is moved to the edge of the top of the pile foundation, and the radius of the pile foundation is measured using the length scale lines on the measuring slide rod. Then, the measuring slide rod is moved to a suitable position, and its adjustment position is observed using the length scale lines. When the measuring vertical plate contacts the top surface of the pile foundation, the operator marks the corresponding position on the pile foundation, facilitating rapid measurement and positioning of the excitation point and sensor installation site. Through the cooperation of the support frame and the measuring components, rapid measurement and positioning of the excitation point and sensor installation site are achieved, improving the efficiency of pile foundation testing.

[0009] Optionally, the top frame includes a supporting outer ring, a supporting inner ring, and connecting rods. The supporting outer ring is connected to the top end of the supporting rod. The supporting inner ring is coaxially disposed inside the supporting outer ring. Several connecting rods are connected between the inner ring wall of the supporting outer ring and the outer ring wall of the supporting inner ring. The rotating rod is rotatably disposed in the supporting inner ring. A centering assembly is provided on the support frame. The centering assembly includes a centering ring plate, a clamping rod, and a driving slide rod. Each supporting rod has a rotating groove. The outer edge of the centering ring plate is rotatably disposed in several rotating grooves. A driving spiral groove is provided on the top surface of the centering ring plate. One clamping rod is provided on each supporting rod. The clamping rod horizontally passes through the supporting rod and is slidably connected to it. The clamping rod is disposed along the radial direction of the supporting outer ring. One driving slide rod is vertically disposed on each clamping rod. The bottom end of the driving slide rod is slidably disposed in the driving spiral groove.

[0010] By adopting the above technical solution, the support frame is placed outside the pile foundation, and the centering ring plate is fitted over the pile foundation. Rotating the centering ring plate drives the sliding rod to slide in the driving spiral groove of the centering ring plate, and several clamping rods move simultaneously along the radial direction of the top frame under the driving action. When the ends of several clamping rods simultaneously contact the peripheral wall of the pile foundation, the top frame and the pile foundation are coaxially arranged. At this time, the rotating rod is aligned with the center of the pile foundation, achieving rapid centering of pile foundations and the support frame with different diameters.

[0011] Optionally, the bottom end of the rotating rod is provided with a connecting screw, and two sets of measuring components are provided on the support frame. The measuring sleeve rods in the two sets of measuring components are rotatably mounted on the connecting screw. Two connecting bolts are threaded onto the connecting screw, and the two connecting bolts are respectively located on the side of the two measuring sleeve rods that are far apart from each other.

[0012] By adopting the above technical solution, the setup of the two sets of measuring components facilitates the operator's simultaneous positioning of the excitation point and the sensor mounting point. The two measuring sleeves are rotated to the specified included angle, and the two connecting bolts are tightened to bring the two measuring sleeves together and achieve relative stillness. The two measuring sleeves are then rotated to the appropriate position, and the two measuring slide rods are moved to the appropriate position, thus achieving simultaneous positioning of the excitation point and the sensor mounting point.

[0013] Optionally, a sliding groove is provided on the measuring vertical plate along the vertical direction, and a slider is provided at the end of the measuring slide rod away from the rotating rod. The slider is slidably disposed in the sliding groove, and a first tension spring is connected between the inner top wall of the sliding groove and the slider.

[0014] By adopting the above technical solution, different pile foundations have different heights above the ground, and the sliding block and sliding groove enable a sliding connection between the measuring rod and the measuring vertical plate. The first tension spring ensures that the bottom end of the measuring vertical plate is always pressed against the top end of the pile foundation.

[0015] Optionally, a mounting plate is provided on one side of the measuring vertical plate, and sliding rollers are provided on the bottom surface of the mounting plate.

[0016] By adopting the above technical solution, the sliding roller makes rolling contact with the top of the pile foundation, reducing the friction force on the measuring vertical plate during the adjustment process.

[0017] Optionally, the bottom end of the measuring vertical plate is provided with a receiving groove along the vertical direction, and a mounting block is slidably disposed in the receiving groove. A carbon pencil is vertically disposed at the bottom end of the mounting block. A pressing sliding hole communicating with the receiving groove is opened on the measuring vertical plate along the vertical direction. A pressing sliding rod is connected to the mounting block. The pressing sliding rod is slidably disposed in the pressing sliding hole. One end of the pressing sliding rod extends out of the measuring vertical plate. A second tension spring is provided between the inner top wall of the receiving groove and the mounting block. In the natural state, the bottom end of the carbon pencil extends out of the receiving groove under the action of the second tension spring. The bottom height of the sliding roller is lower than the bottom height of the carbon pencil.

[0018] By adopting the above technical solution, after the measuring vertical plate is moved to the appropriate position, the sliding rod is pressed down, and the bottom end of the carbon pencil contacts the top of the pile foundation and makes a mark. After marking, the sliding rod is released, and the mounting block moves upward under the action of the second tension spring. This avoids the bottom end of the carbon pencil contacting the top of the pile foundation when the measuring vertical plate is moved.

[0019] Optionally, a measuring ring is coaxially disposed between the inner supporting ring and the outer supporting ring, and the measuring ring is provided with circumferential angle scale lines.

[0020] By adopting the above technical solution, the position of the measuring sleeve can be precisely adjusted according to the angle scale lines on the measuring ring when the measuring sleeve is rotated.

[0021] Optionally, a clamping plate is connected to one end of the clamping rod located below the top frame, and a clamping pad is provided on the side of the clamping plate away from the clamping rod.

[0022] By adopting the above technical solution, the installation of clamping plates and clamping shims reduces the possibility of damage to the pile foundation perimeter during the centering process.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. Through the cooperation of the support frame and the measuring components, rapid measurement and positioning of the excitation point and sensor installation point are achieved, which improves the efficiency of pile foundation testing;

[0025] 2. The centering component enables rapid centering of piles and support frames of different diameters;

[0026] 3. The installation of clamping plates and clamping shims reduces the possibility of damage to the pile foundation perimeter during the centering process. Attached Figure Description

[0027] Figure 1 This is a schematic diagram illustrating the structure of a low-strain dynamic pile foundation detection and positioning device according to an embodiment of this application.

[0028] Figure 2 yes Figure 1 Enlarged view of part A in the middle.

[0029] Figure 3 This is a partial sectional view used in the embodiments of this application to illustrate the internal structure of the measuring vertical plate.

[0030] Figure 4 yes Figure 3 Enlarged view of section B in the middle.

[0031] Explanation of reference numerals in the attached drawings: 1. Support frame; 101. Support rod; 1011. Rotating groove; 102. Outer support ring; 103. Inner support ring; 104. Connecting rod; 105. Measuring ring; 106. Angle scale line; 2. Centering assembly; 21. Centering ring plate; 211. Drive spiral groove; 22. Clamping plate; 23. Clamping rod; 24. Limiting block; 25. Drive sliding rod; 26. Clamping shim; 3. Measuring assembly; 31. 32. Measuring sleeve; 33. Measuring slide bar; 34. Sliding block; 35. Measuring vertical plate; 36. Sliding groove; 37. Receiving groove; 38. Pressing sliding hole; 39. Mounting block; 30. Mounting groove; 31. Charcoal pencil; 32. Mounting plate; 33. Sliding roller; 4. Rotating rod; 5. Limiting ring; 6. Connecting screw; 7. Connecting bolt; 8. Length scale line; 9. First tension spring; 10. Pressing slide bar; 11. Second tension spring. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-4 This application will be further described in detail below. Embodiments of this application provide a low-strain dynamic pile foundation testing and positioning device, which improves the efficiency of pile foundation testing.

[0033] Reference Figure 1 A low-strain dynamic pile foundation testing and positioning device includes a support frame 1, a centering component 2, and a measuring component 3. The support frame 1 includes support rods 101, a top frame, and a measuring ring 105. The top frame is horizontally positioned, and several support rods 101 are vertically positioned on the bottom surface of the top frame. The top frame includes a coaxial and horizontally positioned outer support ring 102 and inner support ring 103, with several connecting rods 104 arranged radially between the outer support ring 102 and the inner support ring 103. The measuring ring 105 is coaxially positioned between the outer support ring 102 and the inner support ring 103, and angular scale lines 106 are arranged circumferentially on the measuring ring 105.

[0034] Reference Figure 1 and Figure 2The centering assembly 2 is mounted on the support frame 1. The centering assembly 2 includes a centering ring plate 21, a clamping plate 22, a clamping rod 23, a limiting block 24, a driving slide rod 25, and a clamping pad 26. Each support rod 101 has a rotating groove 1011, and several rotating grooves 1011 are located on the same horizontal plane. The centering ring plate 21 is rotatably mounted in these rotating grooves. The top surface of the centering ring plate 21 has a driving spiral groove 211. One clamping rod 23 is horizontally slidably connected to each support rod 101, and the clamping rod 23 is positioned along the radial direction of the top frame. The end of the clamping rod 23 closest to the central axis of the top frame is connected to the clamping plate 22, the side of the clamping plate 22 away from the clamping rod 23 is connected to the clamping pad 26, and the side of the clamping rod 23 away from the clamping plate 22 is connected to the limiting block 24. One drive slide rod 25 is connected to the bottom end of each clamping rod 23. The bottom end of the drive slide rod 25 is slidably disposed in the drive spiral groove 211. Several clamping plates 22 are located on the same circumference coaxial with the top frame.

[0035] Reference Figure 3 and Figure 4 A rotating rod 4 is rotatably mounted in the inner ring 103, with a limiting ring 5 at each end of the rotating rod 4. The inner ring 103 is clamped between the two limiting rings 5. A connecting screw 6 is vertically mounted at the bottom end of the rotating rod 4, and a connecting bolt 7 is threaded onto the connecting screw 6. The measuring assembly 3 includes a measuring sleeve 31, a measuring slide rod 32, a slider 33, a measuring vertical plate 34, a mounting block 35, a carbon pencil 36, a mounting plate 37, and a sliding roller 38. One end of the measuring sleeve 31 is horizontally rotatably mounted on the connecting screw 6, and two measuring sleeves 31 are mounted on the connecting screw 6. Two connecting bolts 7 are mounted on the connecting screw 6, and the two connecting bolts 7 press the two measuring sleeves 31 together at the opposite ends. The measuring slide rod 32 is slidably mounted at the end of the measuring sleeve 31 away from the connecting screw 6, and length scale lines 8 are provided on the measuring slide rod 32 along its length. The slider 33 measures the end of the sliding rod 32 away from the rotating rod 4, and the measuring vertical plate 34 is vertically set at the end of the measuring rod 32 away from the rotating rod 4. A sliding groove 341 is provided on the measuring vertical plate 34 along the length direction, and the slider 33 is slidably set in the sliding groove 341. A first tension spring 9 is connected between the inner top wall of the sliding groove 341 and the top surface of the slider 33.

[0036] Reference Figure 3 and Figure 4A mounting plate 37 is connected to one side of the bottom end of the measuring vertical plate 34, and a sliding roller 38 is rotatably connected to the bottom surface of the mounting plate 37. A receiving groove 342 is vertically formed at the bottom end of the measuring vertical plate 34, and a mounting block 35 is slidably disposed in the receiving groove 342. A pressing sliding hole 343 communicating with the receiving groove 342 is formed vertically on the measuring vertical plate 34, and a pressing sliding rod 10 is horizontally connected to the mounting block 35. One end of the pressing sliding rod 10 extends out of the measuring vertical plate 34 through the pressing sliding hole 343. A second tension spring 11 is disposed in the receiving hole, and the second tension spring 11 is connected between the top end of the mounting block 35 and the inner bottom wall of the receiving groove 342. A mounting groove 351 is formed on the bottom surface of the mounting block 35, and the top end of the charcoal pencil 36 is inserted into the mounting groove 351. In its natural state, the height of the bottom end of the charcoal pencil 36 is higher than the height of the bottom end of the sliding roller 38.

[0037] Reference Figure 1 and Figure 2 When determining the excitation point of the pile foundation and the installation position of the sensor, the support frame 1 is first placed on the ground at the top of the pile foundation, and the centering ring plate 21 is fitted onto the outside of the pile foundation. Rotating the centering ring plate 21 drives the sliding rod 25 to slide in the driving spiral groove 211, and several clamping rods 23 slide synchronously toward the central axis of the top frame until several clamping plates 22 simultaneously abut against the peripheral wall of the pile foundation, thus realizing the rapid alignment of the central axis of the pile foundation and the rotating rod 4.

[0038] Reference Figure 3 and Figure 4 According to the actual positioning needs, the angles of the two measuring sleeve rods 31 are adjusted by observing the angle scale line 106 on the measuring ring 105, and the angles of the two measuring sleeve rods 31 are locked by tightening the two connecting bolts 7. The measuring slide rod 32 is slidable as needed, and the length scale line 8 enables precise measurement of the alignment point. Simultaneously rotating the two measuring sleeve rods 31 and the sliding roller 38 reduces the sliding friction between the measuring vertical plate 34 and the top surface of the pile foundation. The two measuring sleeve rods 31 enable simultaneous positioning of the excitation point and the sensor installation point. After adjusting the two measuring sleeve rods 31 to the appropriate position, the sliding rod 10 is pressed down, the mounting block 35 moves downward, and the carbon pencil 36 marks the pile foundation. Releasing the pressing slide rod 10 causes the mounting block 35 to move upward and reset under the action of the second tension spring 11. The first tension spring 9 ensures that the top of the measuring vertical plate 34 always abuts against the top of the pile foundation for pile foundations of different heights.

[0039] The implementation principle of the low-strain dynamic testing pile foundation detection and positioning device in this application embodiment is as follows: First, the support frame 1 is placed on the ground at the top of the pile foundation, and the centering ring plate 21 is rotated until several clamping plates 22 are simultaneously pressed against the periphery of the pile foundation, thereby realizing the rapid alignment of the pile foundation center axis and the rotating rod 4.

[0040] Adjust the angles of the two measuring sleeves 31 and tighten the two connecting bolts 7 to lock the angles of the two measuring sleeves 31. Slide the measuring slide rod 32 as needed, while simultaneously rotating the two measuring sleeves 31. The setting of the two measuring sleeves 31 enables simultaneous positioning of the excitation point and the sensor installation point. After the two measuring sleeves 31 are adjusted to the appropriate position, press down on the slide rod 10, and the carbon pencil 36 will make a mark on the pile foundation.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A low-strain dynamic pile foundation testing and positioning device, characterized in that: The device includes a support frame (1) and a measuring component (3). The support frame (1) includes several support rods (101) and a top frame connected to the top of the support rods (101). A rotating rod (4) is rotatably mounted on the top frame. The measuring component (3) includes a measuring sleeve rod (31), a measuring slide rod (32), and a measuring vertical plate (34). One end of the measuring sleeve rod (31) is horizontally mounted on the rotating rod (4). The measuring slide rod (32) is slidably connected to the end of the measuring sleeve rod (31) away from the rotating rod (4). A length scale line (8) is provided on the measuring slide rod (32) along its length direction. The measuring vertical plate (34) is vertically mounted on the end of the measuring slide rod (32) away from the rotating rod (4). The measuring vertical plate (34) is vertically slidably connected to the measuring slide rod (32).

2. The low-strain dynamic pile foundation testing and positioning device according to claim 1, characterized in that: The top frame includes a supporting outer ring (102), a supporting inner ring (103), and connecting rods (104). The supporting outer ring (102) is connected to the top end of the supporting rod (101). The supporting inner ring (103) is coaxially disposed inside the supporting outer ring (102). Several connecting rods (104) are connected between the inner ring wall of the supporting outer ring (102) and the outer ring wall of the supporting inner ring (103). The rotating rod (4) is rotatably disposed in the supporting inner ring (103). A centering assembly (2) is provided on the support frame (1). The centering assembly (2) includes a centering ring plate (21), a clamping rod (23), and a driving slide rod (25). Each of the supporting... Rotating grooves (1011) are provided on each rod (101). The outer edge of the centering ring plate (21) is rotatably disposed in several of the rotating grooves (1011). A driving spiral groove (211) is provided on the top surface of the centering ring plate (21). One clamping rod (23) is provided on each of the support rods (101). The clamping rod (23) passes horizontally through the support rod (101) and is slidably connected to it. The clamping rod (23) is arranged along the radial direction of the outer ring (102) of the support. One driving slide rod (25) is vertically disposed on each of the clamping rods (23). The bottom end of the driving slide rod (25) is slidably disposed in the driving spiral groove (211).

3. The low-strain dynamic pile foundation testing and positioning device according to claim 2, characterized in that: The bottom end of the rotating rod (4) is provided with a connecting screw (6). Two sets of measuring components (3) are provided on the support frame (1). The measuring sleeves (31) in the two sets of measuring components (3) are rotatably mounted on the connecting screw (6). Two connecting bolts (7) are threaded onto the connecting screw (6). The two connecting bolts (7) are respectively located on the side of the two measuring sleeves (31) that are far apart from each other.

4. The low-strain dynamic pile foundation testing and positioning device according to claim 2, characterized in that: The measuring vertical plate (34) has a sliding groove (341) along the vertical direction. The measuring slide rod (32) has a slider (33) at the end away from the rotating rod (4). The slider (33) is slidably disposed in the sliding groove (341). A first tension spring (9) is connected between the inner top wall of the sliding groove (341) and the slider (33).

5. The low-strain dynamic pile foundation testing and positioning device according to claim 4, characterized in that: A mounting plate (37) is provided on one side of the measuring vertical plate (34), and a sliding roller (38) is provided on the bottom surface of the mounting plate (37).

6. The low-strain dynamic testing pile foundation detection and positioning device according to claim 5, characterized in that: The bottom end of the measuring vertical plate (34) is provided with a receiving groove (342) along the vertical direction. A mounting block (35) is slidably disposed in the receiving groove (342). A carbon pencil (36) is vertically disposed at the bottom end of the mounting block (35). A pressing sliding hole (343) communicating with the receiving groove (342) is opened on the measuring vertical plate (34) along the vertical direction. A pressing sliding rod (10) is connected to the mounting block (35). The slidable setting is in the pressing sliding hole (343), one end of the pressing sliding rod (10) extends out of the measuring vertical plate (34), a second tension spring (11) is provided between the inner top wall of the receiving groove (342) and the mounting block (35), in the natural state the bottom end of the charcoal pencil (36) extends out of the receiving groove (342) under the action of the second tension spring (11), and the bottom height of the sliding roller (38) is lower than the bottom height of the charcoal pencil (36).

7. The low-strain dynamic pile foundation testing and positioning device according to claim 3, characterized in that: A measuring ring (105) is coaxially arranged between the inner supporting ring (103) and the outer supporting ring (102), and an angle scale line (106) is arranged on the measuring ring (105) along the circumferential direction.

8. The low-strain dynamic pile foundation testing and positioning device according to claim 2, characterized in that: The clamping rod (23) is connected to a clamping plate (22) at one end below the top frame, and a clamping pad (26) is provided on the side of the clamping plate (22) away from the clamping rod (23).

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