Precast pile soil core probe pressure penetration type foundation pile integrity detection device and method

Abstract

The invention discloses a precast pile soil core probe pressure penetration type foundation pile integrity detection device and method, and belongs to the technical field of pile foundation detection.The precast pile soil core probe pressure penetration type foundation pile integrity detection device comprises a to-be-detected pipe pile, a connecting frame is installed on the top face of the to-be-detected pipe pile, a hydraulic telescopic rod is fixedly connected to the top of the connecting frame, and the bottom of the hydraulic telescopic rod is connected with a probe rod through a sleeve flange plate; a probe is arranged at one end of the probe rod away from the casing flange. According to the method, pile core soil fluctuation caused by pile body vibration is collected through a probe, and the integrity of the prefabricated spliced pile is judged through collected soil body speed response time-depth signals. The probe can collect the basic physical and mechanical characteristics of the soil plug and the side friction resistance during penetration, the probe is further integrated with a three-way detector at the same time, and the soil body response caused by the vibration of the pile body can be collected.

Description

Technical Field

[0001] The 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, and 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. In order to facilitate transportation within the city and on-site lifting, the prefabricated pipe piles produced in the factory are often transported to the site before assembly. However, due to the existence of joints in spliced ​​piles, commonly used pile foundation integrity detection 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 non-destructive testing method for evaluating the integrity of pile foundations. It mainly determines the integrity and defects of the pile body by analyzing the propagation characteristics of stress waves in the pile body. It is widely used in actual engineering inspections due to its advantages such as fast and efficient, good portability and low cost. However, when inspecting prefabricated spliced ​​piles, since the joints between the two pipe piles are similar to "broken piles" in nature, stress waves will be reflected at the joints, which seriously hinders the identification of the reflected signal at the bottom of the pile.

[0004] The acoustic wave transmission method is mainly used for large-diameter bored piles. It detects the integrity of the pile body by emitting and receiving sound waves between pre-buried acoustic detection pipes and measuring the relative changes in acoustic parameters such as the sound time when the sound waves propagate in the concrete medium. Since the piles are hollow inside, the acoustic wave transmission method cannot be used for the detection of prefabricated piles.

[0005] The cone penetration test (CPT) is one of the most classic geotechnical in-situ testing technologies. This technology was invented by Dutch engineer Pieter Barentsen in 1932 and is used for experimental research on pile bearing capacity. After nearly a hundred years of development, the cone penetration test equipment has undergone iterative innovations characterized by mechanical, electrical, electronic and digital types. At present, more test channels are integrated into the probe of the cone penetration device. In addition to measuring the cone tip resistance and cone side resistance, it can also measure other parameters such as pore water pressure, resistivity, and groundwater pH.

[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 fixedly connected 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 one end of the probe rod away from the casing flange.

[0009] Preferably, the top surface of the pipe pile to be tested is fixedly connected to 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 two vertical rods are fixedly connected to cross rods, and 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 prefabricated pile soil core probe pressure penetration type foundation pile integrity detection 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 crossbar and fix the crossbar and the vertical rod 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 process of pressing the probe rod in, use a hammer to strike the pile top every time it is pressed in 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 in 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 fluctuation 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 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 bottom of the pile, 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 drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

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

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

[0021] Figure 3 It 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 be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work 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 fixedly connected 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 5 is provided at the end of the probe rod 4 away from the casing flange 3.

[0026] The present invention uses the probe 5 to collect the fluctuation 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 probe 5 includes the cone tip resistance sensor, the side friction resistance sensor and other equipment, which can collect the basic physical and mechanical properties of the soil plug and the side friction resistance during penetration. The probe 5 also integrates 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 probe 5 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 vibration response of the pile core soil 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] The present invention can perform integrity testing on spliced ​​piles, and at the same time, can also obtain additional information such as basic physical and mechanical properties of soil plugs, lateral friction resistance during penetration, height of soil plugs, and characteristic value of bearing capacity of pile ends. No additional preparatory work such as drilling is required, and the equipment can be recycled and reused after the test is completed.

[0028] A further optimized solution is that the top surface of the pipe pile 1 to be tested is fixedly connected with a pipe pile flange 7, and the top surface of the pipe pile flange 7 is symmetrically provided with a connecting seat 6, and 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 fixedly connected with cross rods 9, and the cross rods 9 and the vertical rods 8 are fixed by right-angle fasteners 10, and the cross rods 9 are fixed with hydraulic telescopic rods 2.

[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 prefabricated pile soil core probe 5 pressure-penetration type foundation pile comprises the following steps:

[0031] S1, install the connecting frame and fix the vertical rod 8 and 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 through the right-angle fastener 10; use a pad with a reserved notch (for protecting the wire) to support the end of the probe rod 4 with the wire, and pass the wire from the small hole of the casing flange from the inside to the outside, and then press the probe rod 4 into the casing flange, making sure to fix it with screws after pressing to the bottom;

[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 process of pressing the probe rod 4 in, every time it is pressed in a certain distance, the top of the pile is struck with a measuring hammer to collect the soil dynamic response signal at the depth where the probe 5 is located; the measuring steps are repeated until the probe 5 is pressed in less than the length of the pile 1 to be measured.

[0036] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, 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, and therefore should not be understood as a limitation on the present invention.

[0037] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A precast pile soil core probe pressure-penetration type foundation pile integrity detection device, characterized in that: The invention comprises a pipe pile to be tested (1), the top surface of which is mounted a connecting frame, the top of which is fixedly connected with a hydraulic telescopic rod (2), the bottom of which is connected with a probe rod (4) via a casing flange (3), and the end of the probe rod (4) away from the casing flange (3) is provided with a probe (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 in the connecting seat (6), the top surfaces of the two vertical rods (8) are fixedly connected to a cross rod (9), the cross rod (9) and the vertical rod (8) are fixed by a right-angle fastener (10), and the hydraulic telescopic rod (2) is fixedly connected to the cross rod (9).

3. The precast pile soil core probe pressure-penetration type foundation pile integrity detection device according to claim 1 is characterized in that: A three-way detector (11) is arranged inside the probe (5).

4. A method for detecting the integrity of a precast pile soil core probe pressure-penetration type foundation pile, based on the precast pile soil core probe (5) pressure-penetration type foundation pile integrity detection device according to any one of claims 1 to 3, 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, installing the hydraulic telescopic rod (2), installing the hydraulic telescopic rod (2) on the cross bar (9), and fixing the cross bar (9) and the vertical bar (8) by right-angle fasteners (10); S3, installing the probe (5), fixing the probe (5) to the probe rod (4), and fixing the probe rod (4) to the flange of the probe (5); S4, vertically inserting the probe (5) and the probe rod (4) into the pile core soil, and 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 in a certain distance, the top of the pile is struck with a measuring hammer to collect the soil dynamic response signal at the depth where the probe (5) is located; and the measuring steps are repeated until the probe (5) is pressed in less than the length of the pipe pile (1) to be measured.

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