A precast pile soil core probe pressure penetrating type foundation pile integrity detection device and method

Abstract

The application discloses a prefabricated pile soil core probe pressure penetrating type foundation pile integrity detection device and method, and belongs to the technical field of pile foundation detection. The device comprises a pipe pile to be detected, the top surface of the pipe pile to be detected is provided with a connecting frame, the top of the connecting frame is fixedly connected with a hydraulic telescopic rod, the bottom of the hydraulic telescopic rod is connected with a probe rod through a sleeve flange plate, and the end, away from the sleeve flange plate, of the probe rod is provided with a probe. The probe collects the soil fluctuation caused by the pile body vibration, and the integrity of the prefabricated spliced pile is judged according to the collected soil speed response time-depth signal. In addition to the basic physical and mechanical properties of the soil plug and the side friction resistance during penetration, the probe is also integrated with a three-way detector, and can collect the soil response caused by the pile body vibration.

Description

Technical Field

[0001] The present invention belongs to the technical field of pile foundation detection, and in particular relates to a prefabricated pile soil core probe pressure-penetration type foundation pile integrity detection device and method. Background Art

[0002] Prefabricated pipe pile technology occupies an important position in foundation engineering. Its industrialized production and efficient construction have significantly improved the construction efficiency and engineering quality of modern buildings. It is widely used in large structures such as high-rise buildings, bridges, and ports. Compared with other types of piles, it has the advantages of high strength, excellent mechanical properties, adaptability to complex geological conditions, convenient construction, and excellent durability. It is an efficient pile foundation solution widely used in modern foundation engineering. To facilitate transportation within the city and on-site lifting, prefabricated pipe piles produced in the factory are often transported to the site for assembly. However, due to the presence of joints in spliced ​​piles, commonly used pile foundation integrity testing methods such as low-strain reflection wave method and acoustic wave transmission method will face some difficulties and challenges.

[0003] The low-strain reflection wave method is a nondestructive testing method used to assess pile foundation integrity. It primarily determines pile integrity and defects by analyzing the propagation characteristics of stress waves within the pile. Due to its speed, efficiency, portability, and low cost, it is widely used in practical engineering inspections. However, when inspecting prefabricated spliced ​​piles, the joint between the two piles is similar to a "broken pile," causing stress waves to reflect at the joint, severely hindering the identification of the reflected signal from the pile base.

[0004] The acoustic transmission method is primarily used for large-diameter bored cast-in-place piles. It transmits and receives sound waves between pre-buried acoustic testing tubes, measuring the relative changes in acoustic parameters such as the acoustic time as the waves propagate through the concrete medium to verify pile integrity. However, due to the hollow interior of pipe piles, the acoustic transmission method cannot be applied to precast pipe piles.

[0005] The cone penetration test (CPT) is one of the most classic in-situ geotechnical testing techniques. Invented in 1932 by Dutch engineer Pieter Barentsen, it is used for pile bearing capacity research. Over nearly a century of development, CPT equipment has undergone iterative innovations, including mechanical, electrical, electronic, and digital methods. Currently, CPT probes incorporate more test channels, enabling them to measure not only tip and side resistance, but also pore water pressure, resistivity, groundwater pH, and other parameters.

[0006] In order to overcome the shortcomings of existing detection methods and realize the integrity detection of prefabricated spliced ​​piles, a prefabricated pile soil core probe pressure penetration type foundation pile integrity detection device and method are proposed. Summary of the Invention

[0007] The purpose of the present invention is to provide a precast pile soil core probe pressure-penetration type foundation pile integrity detection device and method to solve the problems existing in the above-mentioned prior art.

[0008] To achieve the above-mentioned purpose, the present invention provides the following solution: The present invention provides a precast pile soil core probe pressure-penetration type foundation pile integrity detection device, comprising a pipe pile to be tested, a connecting frame is installed on the top surface of the pipe pile to be tested, a hydraulic telescopic rod is fixed to the top of the connecting frame, the bottom of the hydraulic telescopic rod is connected to a probe rod through a casing flange, and a probe is provided at the end of the probe rod away from the casing flange.

[0009] Preferably, the top surface of the pipe pile to be tested is fixed with a pipe pile flange, and a connecting seat is symmetrically provided on the top surface of the pipe pile flange. The connecting frame includes vertical rods symmetrically threadedly connected to the connecting seat, and the top surfaces of the two vertical rods are fixed with cross rods. The cross rods are fixed to the vertical rods by right-angle fasteners, and the hydraulic telescopic rod is fixed to the cross rod.

[0010] Preferably, a three-way detector is provided in the probe.

[0011] A method for detecting the integrity of precast pile foundations using a soil core probe pressure-penetration method comprises the following steps:

[0012] S1. Install the connecting frame and fix the vertical rod and the flange of the pipe pile;

[0013] S2. Install the hydraulic telescopic rod on the horizontal bar and fix the horizontal bar to the vertical bar with right-angle fasteners;

[0014] S3. Install the probe, fix the probe to the probe rod, and fix the probe rod to the probe flange;

[0015] S4. Insert the probe and the probe rod vertically into the pile core soil, and slowly press the probe into the soil at a speed of 20-25mm / s. At this time, the probe will continuously record the vertical static parameters of the soil at different depths;

[0016] S5. During the insertion of the probe rod, use a hammer to strike the pile top every time it is pressed a certain distance to collect the soil dynamic response signal at the depth where the probe is located; repeat the measurement steps until the probe is pressed below the length of the pile to be measured.

[0017] The present invention discloses the following technical effects: The present invention uses a probe to collect the fluctuations in the pile core soil caused by the vibration of the pile body, and judges the integrity of the prefabricated spliced ​​pile by the collected soil velocity response time-depth signal. The cone tip resistance sensor, side friction resistance sensor and other equipment in the probe can collect the basic physical and mechanical properties of the soil plug and the side friction resistance during penetration. The probe also integrates a three-way detector to collect the soil response caused by the vibration of the pile body. A hydraulic telescopic rod is used to provide the probe with penetration force, so that it can penetrate into the pile core soil plug at a constant speed. Every time a certain depth is penetrated, a hammer is used to strike the top of the pile. The depth when the pile core soil vibration response is first received is the height of the pile core soil plug. When the probe penetrates deep into the pile bottom, the physical and mechanical indicators measured by the cone tip resistance sensor can also be used to estimate the characteristic value of the pile end bearing capacity of the prefabricated pipe pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0019] Figure 1 This is a schematic structural diagram of a precast pile soil core probe pressure-penetration type foundation pile integrity detection device according to the present invention;

[0020] Figure 2 Schematic diagram of the internal structure of the probe of the present invention;

[0021] Figure 3 This is a front view of the precast pile soil core probe pressure-penetration type foundation pile integrity detection device of the present invention.

[0022] In the figure: 1. Pipe pile to be tested; 2. Hydraulic telescopic rod; 3. Casing flange; 4. Probe rod; 5. Probe; 6. Connecting seat; 7. Pipe pile flange; 8. Vertical rod; 9. Horizontal rod; 10. Right-angle fastener; 11. Three-way detector. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Reference Figure 1-Figure 3As shown, this embodiment provides a precast pile soil core probe pressure-penetration type foundation pile integrity detection device, including a pipe pile 1 to be tested, a connecting frame is installed on the top surface of the pipe pile 1 to be tested, a hydraulic telescopic rod 2 is fixed to the top of the connecting frame, the bottom of the hydraulic telescopic rod 2 is connected to a probe rod 4 through a casing flange 3, and a probe rod 4 is provided at the end away from the casing flange 3.

[0026] The present invention uses the probe 5 to collect the fluctuations of the pile core soil caused by the vibration of the pile body, and judges the integrity of the prefabricated spliced ​​pile by the collected soil velocity response time-depth signal. The cone tip resistance sensor, side friction resistance sensor and other equipment in the probe 5 can collect the basic physical and mechanical properties of the soil plug and the side friction resistance during penetration. The probe 5 is also integrated with a three-way detector 11, which can collect the soil response caused by the vibration of the pile body. The hydraulic telescopic rod 2 is used to provide the penetration force for the probe 5, so that it can penetrate into the pile core soil plug at a constant speed. Every time a certain depth is penetrated, a hammer is used to strike the top of the pile. The depth when the pile core soil vibration response is first received is the height of the pile core soil plug. When the probe 5 penetrates deep into the pile bottom, the physical and mechanical indicators measured by the cone tip resistance sensor can also be used to estimate the characteristic value of the pile end bearing capacity of the prefabricated pipe pile.

[0027] This method can perform integrity testing on spliced ​​piles, simultaneously obtaining additional information such as the basic physical and mechanical properties of the soil plug, lateral friction during penetration, soil plug height, and characteristic bearing capacity values ​​at the pile tip. No additional preparatory work, such as drilling, is required, and the equipment is recyclable upon completion of the test.

[0028] To further optimize the solution, the top surface of the pipe pile 1 to be tested is fixed with a pipe pile flange 7, and the top surface of the pipe pile flange 7 is symmetrically provided with a connecting seat 6. The connecting frame includes vertical rods 8 symmetrically threaded in the connecting seat 6, and the top surfaces of the two vertical rods 8 are fixed with cross rods 9. The cross rods 9 and the vertical rods 8 are fixed by right-angle fasteners 10, and the hydraulic telescopic rod 2 is fixed to the cross rod 9.

[0029] To further optimize the solution, a three-way detector 11 is provided in the probe 5 .

[0030] A method for detecting the integrity of a precast pile foundation using a soil core probe 5, comprising the following steps:

[0031] S1. Install the connecting frame and fix the vertical rod 8 to the pipe pile flange 7;

[0032] S2. Install the hydraulic telescopic rod 2 on the crossbar 9 and fix the crossbar 9 to the vertical rod 8 with the right-angle fastener 10; use a pad with a reserved notch (for protecting the wire) to support the wire end of the probe rod 4, and pass the wire from the small hole of the casing flange from the inside to the outside, then press the probe rod 4 into the casing flange, making sure it is pressed to the bottom and fixed with screws;

[0033] S3. Install the probe 5, fix the probe 5 to the probe rod 4, and fix the probe rod 4 to the flange of the probe 5;

[0034] S4. Insert the probe 5 and the probe rod 4 vertically into the pile core soil, and slowly press the probe 5 into the soil at a speed of 20-25 mm / s. At this time, the probe 5 will continuously record the vertical static parameters of the soil at different depths;

[0035] S5. During the insertion of the probe rod 4, the top of the pile is struck with a hammer every time the probe rod 4 is inserted to a certain distance, and the soil dynamic response signal at the depth where the probe 5 is located is collected; the measurement steps are repeated until the probe 5 is inserted to less than the length of the pile to be measured 1.

[0036] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A precast pile soil core probe pressure-penetration type foundation pile integrity detection device, characterized by: The invention comprises a pipe pile to be tested (1), wherein a connecting frame is installed on the top surface of the pipe pile to be tested (1), a hydraulic telescopic rod (2) is fixedly connected to the top of the connecting frame, a probe rod (4) is connected to the bottom of the hydraulic telescopic rod (2) via a casing flange (3), a probe rod (5) is provided at one end of the probe rod (4) away from the casing flange (3), and a three-way geophone (11), a cone tip resistance sensor, and a side friction resistance sensor are provided in the probe rod (5).

2. The precast pile soil core probe pressure-penetration type foundation pile integrity detection device according to claim 1 is characterized in that: The top surface of the pipe pile (1) to be tested is fixedly connected to a pipe pile flange (7), the top surface of the pipe pile flange (7) is symmetrically provided with a connecting seat (6), the connecting frame comprises vertical rods (8) symmetrically threadedly connected to the connecting seat (6), the top surfaces of the two vertical rods (8) are fixedly connected to horizontal rods (9), the horizontal rods (9) and the vertical rods (8) are fixed by right-angle fasteners (10), and the hydraulic telescopic rod (2) is fixedly connected to the horizontal rod (9).

3. A precast pile soil core probe pressure penetration type pile foundation integrity detection method, based on the precast pile soil core probe pressure penetration type pile foundation integrity detection device according to claim 2, characterized in that: The following steps are involved: S1. Install the connecting frame and fix the vertical rod (8) and the pipe pile flange (7); S2. Install the hydraulic telescopic rod (2), install the hydraulic telescopic rod (2) on the crossbar (9), and fix the crossbar (9) and the vertical rod (8) through the right-angle fastener (10); S3, installing the probe (5), fixing the probe (5) to the probe rod (4), and fixing the probe rod (4) to the casing flange (3); S4, vertically inserting the probe (5) and the probe rod (4) into the pile core soil, slowly pressing the probe (5) into the soil at a speed of 20-25 mm / s, at which time the probe (5) will continuously record the vertical static parameters of the soil at different depths; S5. During the process of pressing the probe rod (4), every time the probe rod (4) is pressed into a certain distance, the top of the pile is struck with a hammer to collect the soil dynamic response signal at the depth where the probe rod (5) is located; the measurement steps are repeated until the probe rod (5) is pressed into the length of the pile (1) to be measured.

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