A prefabricated pile transient time domain analysis method excitation device

Abstract

The present invention discloses a precast pile transient time domain analysis method excitation device, including a hollow rectangular shell, in which a positioning base, a sliding device, a vibrating hammer, a driving pole, and a limiting device are arranged. The positioning base is located on the top inner wall of the shell, and the top of the sliding device is elastically telescopically connected to the bottom of the positioning base by a spring A, and a vibrating hammer is fixed to the bottom by a connecting rod; the driving pole is located outside the shell, and pushes the sliding device through its top rod, so that the sliding device slides vertically up and down; the limiting device is located on the shell above the driving pole. It can be seen from the structure of the present invention that the traditional manual hand-held hammer or rod excitation method is changed, and the purpose of automatically hammering the precast pile is achieved by driving the pole in conjunction with the sliding device. The weight of the hammering, the verticality of the falling hammer, and the falling distance can be easily controlled, which greatly improves the accuracy of data collection and analysis, and reduces the work intensity of traditional hammering personnel.

Description

Technical Field

[0001] The invention relates to the field of pile foundation detection, and in particular to a prefabricated pile transient time domain analysis method excitation device. Background Art

[0002] Precast piles are strong and durable in structure. They can be made into different cross-section sizes and lengths. They can withstand large vertical loads and construction hammer stresses, and are not affected by groundwater and moisture changes. The construction quality is easier to control than other pile types, and they are widely used in building foundation projects. The main control items for the quality inspection of precast piles after construction are bearing capacity and pile body integrity. Among them, the low-strain method is the most widely used to check the integrity of the pile body. The low-strain method refers to a detection method that uses low-energy transient or steady-state excitation to excite the top of the pile, measures the velocity time history curve or velocity admittance curve at the top of the pile, and determines the integrity of the pile body through wave theory analysis or frequency domain analysis. At present, almost all domestic and foreign testing institutions use transient excitation to detect pile body integrity.

[0003] Excitation is one of the important links in low-strain detection work. It requires that the waveform of multiple hammering should have good repeatability and consistency, and each detection point should not be less than 3 valid signals. The traditional manual handheld force rod or hand hammer excitation method has the following problems: 1. The number of tests is large, and the work intensity of the hammering personnel is high; 2. Select a force rod or hand hammer of appropriate weight to obtain the pile bottom reflection signal of different pile lengths; 3. The weight of manual hammering, the verticality of the hammer, the drop distance, the hammering position, etc. are not easy to master, which affects the repeatability and consistency of the collected signal, and thus affects the accuracy of the subsequent analysis. Summary of the invention

[0004] The purpose of the present invention is to provide a precast pile transient time domain analysis method excitation device to overcome the defects of the prior art and solve the problems that traditional manual hammering has high labor intensity, the weight of the hammering, the verticality of the falling hammer, and the falling distance are difficult to control, which greatly reduces the accuracy of data collection and analysis.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A precast pile transient time domain analysis method excitation device, comprising a hollow rectangular shell, a positioning base, a sliding device, a vibrating hammer, a driving pole, and a limiting device are arranged in the shell, the positioning base is located on the top inner wall of the shell, the top of the sliding device is elastically connected to the bottom of the positioning base by a spring A, and a vibrating hammer is fixed to the bottom by a connecting rod;

[0007] The driving pole is located outside the housing and pushes the sliding device through its top rod, so that the sliding device slides vertically up and down;

[0008] The limiting device is located on the outer shell above the driving pole.

[0009] A further improvement of the present invention is that the sliding device comprises a slider, a spring B, a top block, a slide rod, a limit nut and a guide rail, the slider is provided with vertical slide grooves on the front and rear sides, the front and rear inner walls of the housing are provided with vertical guide rails, and the slider slides on the guide rails through the slide grooves;

[0010] The top of the slider is connected to the bottom of the positioning base through a spring A. A vertical positioning rod is provided at the bottom of the positioning base, and the spring A is sleeved on the positioning rod.

[0011] A groove is provided on the right side surface of the slider, the groove extends from right to left and does not pass through the left side surface of the slider, a transverse sliding hole is passed through the bottom of the groove, one end of the sliding rod is welded to the left side surface of the top block, the other end passes through the transverse sliding hole, and a limit nut is threadedly connected to the other end of the sliding rod;

[0012] A spring B is sleeved on the slide bar between the top block and the bottom of the groove.

[0013] A further improvement of the present invention is that when the spring B is in a relaxed state, half of the top block is located in the groove, and the other half is located outside the slider, and the top of the slider located outside is provided with a slide slope inclined to the right and downward.

[0014] A further improvement of the present invention is that a vertical strip groove is horizontally penetrated through the middle of the right side wall of the shell, the right end of the top block slides up and down in the strip groove and does not penetrate the right side wall of the shell, and the length of the right end of the top block extending into the strip groove is less than the distance between the limit nut and the left inner wall of the shell.

[0015] A further improvement of the present invention is that a limiting device is provided at the top of the strip groove, and the limiting device includes an adjusting nut, a limiting rod, a limiting block and a locking nut. The right end of the limiting rod is threadedly connected with an adjusting nut, and the left end passes through the strip groove and the limiting block in sequence, and finally the left end is fixed by the locking nut.

[0016] A further improvement of the present invention is that the limit rod is divided into a left threaded rod, a middle square rod and a right threaded rod, the outer diameters of the left threaded rod and the right threaded rod are equal to the side length of the longitudinal section of the middle square rod, and the middle square rod is located in the strip groove;

[0017] A transverse square hole is passed through the middle of the limit block, and the square hole matches the middle square rod. The left side of the lower part of the limit block is inclined to the right and lower, matching the landslide.

[0018] A further improvement of the present invention is that two symmetrical magnetic ear plates are provided on the left and right sides of the bottom of the shell, and the magnetic ear plates are in an "inward-facing" arc shape. A driving electric pole with a top rod facing vertically upward is provided on the magnetic ear plate on the right side.

[0019] A further improvement of the present invention is that a horizontal curved portion is provided at the top end of the driving pole mandrel, and the curved portion extends into the strip groove and is located directly below the landslide when not in operation.

[0020] A further improvement of the present invention is that the top end of the connecting rod is threadedly connected to the bottom of the sliding block, and the bottom end is threadedly connected to a vibrating hammer.

[0021] A further improvement of the present invention is that a limit screw is transversely passed through the left side wall below the housing, and the right end of the screw rod of the screw extends to just below the left bottom of the slider.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention provides a precast pile transient time domain analysis method excitation device, wherein vertical slide grooves are provided on the front and rear sides of the slider, and vertical guide rails are provided on the front and rear inner walls of the shell. The slider slides on the guide rails through the slide grooves, so that the position of the slider can be limited, and no front, back, left, or right deviation occurs, while the slider can slide freely up and down.

[0024] 2. The present invention provides a precast pile transient time domain analysis method excitation device, in which a vertical positioning rod is provided at the bottom of the positioning base, and a spring A is sleeved on the positioning rod to provide a vertical guiding function for the spring A, thereby preventing the spring A from deviating to the left and right due to the squeezing force when the slider slides up and down, and preventing the elastic force from being concentrated downward.

[0025] 3. The present invention provides a precast pile transient time domain analysis method excitation device, one end of the sliding rod is welded to the left side surface of the top block, the other end passes through the transverse sliding hole, and a limiting nut is threadedly connected to the other end of the sliding rod, and a spring B is sleeved on the sliding rod located between the top block and the bottom of the groove. When the top block is retracted, the spring B is quickly compressed and the sliding rod moves to the left. When the top rod of the driving pole is lifted, the slider automatically slides down to achieve the purpose of hammering. During the falling process, the spring B is quickly reset, the sliding rod moves to the right, and the limiting nut limits the amplitude of the right movement of the top block. At the same time, the top rod of the driving pole is pulled back to compress the top block, and the top block is reset again. The top rod of the driving pole is located directly below the landslide, ready for the next secondary hammering, thereby achieving the purpose of fully automated continuous hammering.

[0026] 4. The present invention provides a precast pile transient time domain analysis method excitation device, in which a vertical strip groove is horizontally penetrated through the middle of the right side wall of the shell. When the spring B is in a relaxed state, the right end of the top block slides up and down in the strip groove and does not penetrate the right side wall of the shell, which is conducive to the rapid retraction of the top block and ensures that the top end of the driving pole top rod can lift the top block to achieve the subsequent automatic hammering purpose.

[0027] 5. In a precast pile transient time domain analysis method excitation device provided by the present invention, the length of the right end of the top block extending into the strip groove is smaller than the distance between the limit nut and the left inner wall of the shell, so that when the top block retracts, there is enough space on the left side of the slider to facilitate the lateral movement of the limit nut, thereby realizing the retraction or release of the top block.

[0028] 6. The present invention provides a precast pile transient time domain analysis method excitation device, in which the right end of the limit rod is threadedly connected with an adjusting nut, and the left end passes through the strip groove and the limit block in sequence, and finally the left end is fixed by a locking nut. By loosening the adjusting nut, the entire limit device can slide up and down along the strip groove to adjust the drop distance of the hammer in real time.

[0029] 7. The present invention provides a precast pile transient time domain analysis method excitation device, wherein the outer diameter of the left threaded rod and the outer diameter of the right threaded rod are equal to the side length of the longitudinal section of the middle square rod, so that it is easy for the limit rod to be inserted into the square hole of the limit block.

[0030] 8. The present invention provides a precast pile transient time domain analysis method excitation device, in which a horizontal square hole runs through the middle of the limit block, the square hole matches the middle square rod, and the middle block rod is located in the strip groove, so that when the limit block is passed on the middle square rod or the adjusting nut adjusts the hammer distance, no circumferential rotation occurs, and the vertical state is always maintained, that is, the limit block is kept matched with the landslide.

[0031] 9. The present invention provides a precast pile transient time domain analysis method excitation device, in which the left side surface of the lower part of the limit block is inclined to the lower right, matching the landslide, so that when the top rod of the electric pole is driven to lift the top block upward and the top block slides to the inclined slope at the lower part of the limit block, the top block retracts into the shell along the slope due to the squeezing force from the bottom, so as to prepare for the subsequent release of the vibrator.

[0032] 10. The present invention provides a precast pile transient time domain analysis method excitation device, which has two symmetrical magnetic ear plates on the left and right sides of the bottom of the shell, so that the whole device can be fixed on the end plate of the precast pile. At the same time, the magnetic ear plates are in an "inward eight" arc shape, which is convenient for matching with the annular pile end plate and is conducive to magnetic fixation.

[0033] 11. The present invention provides a precast pile transient time domain analysis method excitation device, in which a horizontal curved portion is provided at the top of the driving pole top rod, and the curved portion extends into the strip groove. When not in operation, the curved portion is located directly below the landslide, so that it is convenient to drive the pole top rod to lift the top block upward during operation, so that the slider drives the vibrator to move upward, thereby achieving the purpose of the subsequent hammering.

[0034] 12. The present invention provides a precast pile transient time domain analysis method excitation device, which is located on the left side wall below the shell and has a limiting screw that runs horizontally through it. The right end of the screw rod extends to just below the left bottom of the slider, so that when the vibrator falls, it will not fall from the bottom of the shell, and at the same time limit the sliding position of the slider.

[0035] 13. The present invention provides a precast pile transient time domain analysis method excitation device, which changes the traditional manual handheld hammer or rod excitation method, and realizes the purpose of automatically hammering the precast pile by driving the electric pole in conjunction with the sliding device. The weight of the hammer, the verticality of the drop hammer, and the drop distance can be easily controlled, and the signal repeatability and consistency are relatively easy to achieve, which greatly improves the accuracy of data collection and analysis, and reduces the workload of traditional hammering personnel.

[0036] 14. The instantaneous time-domain analysis method vibration excitation device for prefabricated piles provided by the present invention has low cost, simple and convenient operation, is easy to carry, can achieve the purpose of on-site real-time detection, and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a half-section front view of the overall structure of the present invention.

[0038] Figure 2 It is a half-section side view of the overall structure of the present invention.

[0039] Figure 3 It is an enlarged view of the sliding device structure of the present invention.

[0040] Figure 4 It is a cross-sectional view of the AA structure of the present invention.

[0041] Figure 5 It is a schematic diagram of the structure of the right side of the housing of the present invention.

[0042] Figure 6 It is the front view of the limiting rod structure of the present invention.

[0043] Figure 7 It is a side view of the limiting rod structure of the present invention. DETAILED DESCRIPTION

[0044] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0045] Example 1: Figures 1 to 7A precast pile transient time domain analysis method excitation device shown includes a hollow rectangular shell 1, in which a positioning base 2, a sliding device 3, a vibrating hammer 4, a driving pole 5, and a limiting device 6 are arranged. The positioning base 2 is located on the top inner wall of the shell 1, and the top of the sliding device 3 is elastically telescopically connected to the bottom of the positioning base 2 by a spring A7, and the vibrating hammer 4 is fixed to the bottom by a connecting rod 8; the driving pole 5 is located outside the shell 1, and pushes the sliding device 3 through its top rod 51, so that the sliding device 3 slides vertically up and down; the limiting device 6 is located on the shell 1 above the driving pole 5.

[0046] The sliding device 3 includes a slider 31, a spring B32, a top block 33, a slide rod 34, a limit nut 35 and a guide rail 36. The slider 31 is provided with vertical slide grooves 311 on the front and rear sides, and the front and rear inner walls of the housing 1 are provided with vertical guide rails 36. The slider 31 slides on the guide rails 36 through the slide grooves 311; the top of the slider 31 is connected to the bottom of the positioning base 2 through the spring A7, and the bottom of the positioning base 2 is provided with a vertical positioning rod 21, and the spring A7 is sleeved on the positioning rod 21; a groove 312 is provided on the right side of the slider 31, and the groove 312 is extended from right to left. The groove 312 extends to the left and does not pass through the left side of the slider 31. The bottom of the groove 312 is penetrated by a transverse sliding hole 313. One end of the sliding rod 34 is welded to the left side of the top block 33, and the other end passes through the transverse sliding hole 313. A limiting nut 35 is threadedly connected to the other end of the sliding rod 34. A spring B32 is sleeved on the sliding rod 34 located between the top block 33 and the bottom of the groove 312. When the spring B32 is in a relaxed state, half of the top block 33 is located in the groove 312, and the other half is located on the outside of the slider 31, and the top of the slider 31 located on the outside is provided with a slide slope (314) inclined to the lower right.

[0047] A vertical strip groove 11 is horizontally penetrated in the middle of the right side wall of the shell 1. The right end of the top block 33 slides up and down in the strip groove 11 and does not penetrate the right side wall of the shell 1. The length of the right end of the top block 33 extending into the strip groove 11 is less than the distance between the limit nut 35 and the left inner wall of the shell 1; a limit device 6 is provided on the top of the strip groove 11, and the limit device 6 includes an adjusting nut 61, a limit rod 62, a limit block 63 and a locking nut 64. The right end of the limit rod 62 is threadedly connected with the adjusting nut 61, and the left end passes through the strip groove 11 in sequence. 1. The limit block 63 is finally fixed at the left end by a locking nut 64; the limit rod 62 is divided into a left threaded rod 621, a middle square rod 622, and a right threaded rod 623. The outer diameters of the left threaded rod 621 and the right threaded rod 623 are equal to the side length of the longitudinal section of the middle square rod 622, and the middle square rod 622 is located in the strip groove 11; a transverse square hole 631 runs through the middle of the limit block 63, and the square hole 631 matches the middle square rod 622. The lower left side of the limit block 63 is inclined to the lower right, which matches the landslide 314.

[0048] Two symmetrical magnetic ear plates 9 are provided on the left and right sides of the bottom of the shell 1. The magnetic ear plates 9 are in an "inward-facing" arc shape. A driving pole 5 with a top rod facing vertically upward is provided on the magnetic ear plate 9 on the right side; a horizontal bending portion 51 is provided on the top of the top rod of the driving pole 5, and the bending portion 51 extends into the strip groove 11 and is located directly below the landslide 314 when not in working state.

[0049] The top end of the connecting rod 8 is threadedly connected to the bottom of the slider 31, and the bottom end is threadedly connected to the vibrator 4; a limiting screw 10 is horizontally passed through the left side wall below the shell 1, and the right end of the screw 10 extends to just below the left bottom of the slider 31.

[0050] The driving pole 5 used in the present invention is a motor telescopic pole lifter of model XTL400, which is prior art.

[0051] The working mode of the present invention is as follows:

[0052] Step 1: According to the prefabricated pile detection point, fix the entire device to the prefabricated pile end plate through the magnetic ear plate 8;

[0053] Step 2: By adjusting the nut 61 to control the vertical height of the limit device, the falling distance of the vibrating hammer 4 is adjusted, that is, the hammering energy is adjusted;

[0054] The third step: start the driving pole 5 so that the top rod of the driving pole 5 pushes up the top block 33. When the top block 33 slides upward to the slope of the limit block 63, as the top rod continues to rise, the top block 33 gradually compresses the spring B32 and retracts it into the groove 312; when the top rod slides upward over the bottom of the limit block 63, the slider 31 slides downward under the action of its own gravity and the elastic force of the spring A7, driving the vibrator 4 to hammer downward the detection point on the end plate of the precast pile. At the same time, the bent portion 51 of the top rod of the driving pole 5 is pulled back to just below the top block 33, waiting for the next hammering detection.

[0055] Step 4: Repeat the hammering test and control the different vertical heights of the limit device by adjusting the nut 61, that is, adjust the different energies of the hammering of the vibrating hammer to facilitate data collection and analysis.

Claims

1. A precast pile transient time domain analysis method excitation device, comprising a hollow rectangular shell (1), characterized in that: The housing (1) is provided with a positioning base (2), a sliding device (3), a vibrating hammer (4), a driving pole (5), and a limiting device (6); the positioning base (2) is located on the top inner wall of the housing (1); the top of the sliding device (3) is elastically telescopically connected to the bottom of the positioning base (2) via a spring A (7); the bottom is fixed with a vibrating hammer (4) via a connecting rod (8); the driving pole (5) is located outside the housing (1) and pushes the sliding device (3) via its top rod so that the sliding device (3) slides vertically up and down; the limiting device (6) is located on the housing (1) above the driving pole (5); the sliding device (3) comprises a slider (31), a spring B (32), a top block (33), a sliding rod ( 34), a limit nut (35) and a guide rail (36), the front and rear sides of the slider (31) are provided with vertical slide grooves (311), the front and rear inner walls of the housing (1) are provided with vertical guide rails (36), the slider (31) slides on the guide rails (36) through the slide grooves (311); the top of the slider (31) is connected to the bottom of the positioning base (2) through a spring A (7), the bottom of the positioning base (2) is provided with a vertical positioning rod (21), and the spring A (7) is sleeved on the positioning rod (21); a groove (312) is provided on the right side of the slider (31), the groove (312) extends from right to left and does not pass through the left side of the slider (31), and the bottom of the groove (312) passes through a transverse sliding hole (313) ), one end of the slide bar (34) is welded to the left side surface of the top block (33), and the other end passes through the transverse slide hole (313), and a limit nut (35) is threadedly connected to the other end of the slide bar (34); a slide slope (314) inclined to the right and lower is provided on the top of the slider (31) located on the outside, and a spring B (32) is sleeved on the slide bar (34) located between the top block (33) and the bottom of the groove (312); a vertical strip groove (11) is horizontally penetrated in the middle of the right side wall of the shell (1), the right end of the top block (33) slides up and down in the strip groove (11) and does not penetrate the right side wall of the shell (1), and the length of the right end of the top block (33) extending into the strip groove (11) is less than the distance between the limit nut (35) and the left inner wall of the shell (1). The distance between the two sides is controlled by a plurality of locking nut (64). A limiting device (6) is provided at the top of the strip groove (11). The limiting device (6) comprises an adjusting nut (61), a limiting rod (62), a limiting block (63) and a locking nut (64). The right end of the limiting rod (62) is threadedly connected to the adjusting nut (61). The left end passes through the strip groove (11) and the limiting block (63) in sequence. Finally, the left end is fixed by the locking nut (64). The left side surface of the lower part of the limiting block (63) is inclined to the right and lower, matching the landslide (314). The top end of the top rod of the driving pole (5) is provided with a horizontal curved portion (51). The curved portion (51) extends into the strip groove (11) and is located directly below the landslide (314) when it is not in operation.

2. The precast pile transient time domain analysis method vibration excitation device according to claim 1, characterized in that: When the spring B (32) is in a relaxed state, half of the top block (33) is located in the groove (312), and the other half is located outside the slider (31).

3. The precast pile transient time domain analysis method vibration excitation device according to claim 1, characterized in that: The limiting rod (62) is divided into a left threaded rod (621), a middle square rod (622), and a right threaded rod (623); the outer diameters of the left threaded rod (621) and the right threaded rod (623) are both equal to the side lengths of the longitudinal section of the middle square rod (622), and the middle square rod (622) is located in the strip groove (11); a transverse square hole (631) passes through the middle of the limiting block (63), and the square hole (631) matches the middle square rod (622).

4. The precast pile transient time domain analysis method vibration excitation device according to claim 1, characterized in that: Two symmetrical magnetic ear plates (9) are provided on the left and right sides of the bottom of the housing (1), and the magnetic ear plates (9) are in an "inward eight" arc shape. A driving electric pole (5) with a top rod facing vertically upward is provided on the magnetic ear plate (9) on the right side.

5. The precast pile transient time domain analysis method vibration excitation device according to claim 1, characterized in that: The top end of the connecting rod (8) is threadedly connected to the bottom of the slider (31), and the bottom end is threadedly connected to a vibrating hammer (4).

6. The precast pile transient time domain analysis method vibration excitation device according to claim 1, characterized in that: A limit screw (10) is disposed on the left side wall below the housing (1) and extends transversely therethrough, with the right end of the screw rod of the screw (10) extending to just below the left bottom of the slider (31).

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