Core sampling equipment for pile foundation testing

Abstract

This disclosure relates to the technical field of pile foundation testing. One embodiment of this disclosure provides a core drilling sampling device for pile foundation testing, comprising: a base plate and several movable wheels, which are respectively fixed at the four opposite corners of the bottom surface of the base plate; a vertical frame is fixed to the surface of the base plate; a sampling cylinder is disposed on the vertical frame; a drilling assembly is disposed on the sampling cylinder; and a retraction drive assembly is disposed between the vertical frame and the sampling cylinder. The drilling assembly includes a spiral blade disposed inside the sampling cylinder. The spiral blade is driven to rotate by electricity. A central cutterhead is located at the lower end of the spiral blade, and an outer ring cutterhead is disposed outside the central cutterhead. A gap is left between the central cutterhead and the outer ring cutterhead. This technical solution solves the technical problem in the prior art where the core drilling sampling depth cannot be flexibly controlled according to the soil conditions at the sampling point, leading to unstable sample quality.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the technical field of pile foundation testing, and more specifically, to core sampling equipment for pile foundation testing. Background Technology

[0002] In the field of pile foundation quality testing in building engineering, core sampling is the core method for obtaining authentic samples of the internal structure and soil properties of pile foundations. By drilling core and soil core samples from the pile foundation and bearing stratum using core sampling equipment, the concrete strength, pile integrity, and bearing capacity of the bearing stratum can be directly assessed, providing crucial evidence for pile foundation quality evaluation. With the increasing safety requirements for pile foundations in building engineering, the requirements for the representativeness, integrity, and ease of subsequent analysis of core samples have significantly increased. However, existing core sampling equipment used for pile foundation testing generally suffers from two major drawbacks: first, it cannot flexibly control the core sampling depth according to the soil conditions at the sampling point during daily sampling, leading to unstable sample quality; second, it lacks sample particle screening capabilities, affecting the efficiency of subsequent testing and analysis, and severely restricting the accuracy and reliability of pile foundation testing.

[0003] Traditional core sampling equipment relies heavily on operator experience to set fixed drilling depths, making it impossible to adapt to different soil properties in real time. When encountering soft soil layers such as cohesive soil or silt, a fixed depth can easily lead to drilling too deep, causing the sample to stratify and fracture due to its own weight, thus losing its representativeness. If encountering hard soil layers such as gravel or rock strata, the fixed depth may not penetrate the target soil layer, and the sample may not reflect the true characteristics of the bearing stratum, leading to misjudgments of the pile foundation's bearing capacity by testing personnel. To correct depth deviations, operators need to repeatedly lift the drill to check the soil conditions, significantly reducing daily sampling efficiency.

[0004] Therefore, developing core sampling equipment for pile foundation testing that can control the core drilling depth according to soil conditions and has sample particle screening function has become an urgent need to improve the quality and efficiency of pile foundation testing. Utility Model Content

[0005] To overcome the above-mentioned defects, the embodiments of this disclosure provide a core sampling device for pile foundation testing, which solves the technical problem in the prior art that the core sampling depth cannot be flexibly controlled according to the soil conditions at the sampling point, resulting in unstable sample quality.

[0006] According to one aspect, at least one embodiment of this disclosure provides a core sampling device for pile foundation testing, comprising: The base plate and several casters are fixed at the four opposite corners of the bottom surface of the base plate. The system includes a support frame, a sampling cylinder, and a drilling assembly. The support frame is vertically fixed to the surface of the base plate, the sampling cylinder is mounted on the support frame, and the drilling assembly is mounted on the sampling cylinder. A retraction and extension drive assembly is disposed between the upright frame and the sampling cylinder; The drilling assembly includes a spiral blade disposed inside the sampling cylinder. The spiral blade is driven to rotate by electricity. A central cutter head is disposed at the lower end of the spiral blade. An outer ring cutter head is disposed outside the central cutter head. A gap is left between the central cutter head and the outer ring cutter head.

[0007] As a further technical solution, a discharge pipe is provided on the upper side of one side of the sampling tube, and a first receiving hopper is connected to one end of the discharge pipe. A second receiving hopper is connected to the outer bottom of the first receiving hopper, and the first receiving hopper is located inside the second receiving hopper.

[0008] As a further technical solution, a sieve hole is provided at the bottom of the first receiving hopper, and the front ends of the first receiving hopper and the second receiving hopper are rotatably connected to a baffle through a pin. Both ends of the surfaces of the first receiving hopper and the second receiving hopper are rotatably connected to a blocking block through a pin, and the blocking block is attached to the surface of the baffle.

[0009] According to another aspect, in at least one embodiment of the present invention, the retraction drive assembly includes a vertical screw, which is electrically driven to rotate vertically and is connected to one side of the frame. A lifting seat is vertically slidably connected inside the frame, and the lifting seat is threadedly connected to the vertical screw.

[0010] As a further technical solution, a bracket is horizontally slidably connected to the inner surface of the lifting seat, and the two ends of the bracket are respectively fixedly connected to the two sides of the outer wall of the sampling cylinder, and a horizontal frame is provided on the inner surface of the lifting seat.

[0011] As a further technical solution, a second screw driven by electricity is provided inside the horizontal frame, and the bottom of the bracket on one side is connected to the second screw by a threaded connection. A groove is opened on the surface of the bottom plate, and the inner diameter of the groove matches the bottom diameter of the sampling cylinder.

[0012] As a further technical solution, both the central cutter head and the outer ring cutter head are located outside the sampling cylinder, and both the central cutter head and the outer ring cutter head are annular structures.

[0013] As a further technical solution, both the first receiving hopper and the second receiving hopper have a U-shaped cross-section, and both the first receiving hopper and the second receiving hopper are inclined downwards.

[0014] The beneficial effects of the embodiments disclosed herein are as follows: In this disclosure, the drilling assembly solves the problems of easy sample breakage and impurity contamination in traditional sampling methods through layered cutting and graded screening design. The central and outer cutter heads work together to reduce cutting resistance and ensure sample integrity; the helical blades efficiently transport the sample, preventing accumulation; the first and second receiving hoppers separate the sample from debris through sieve holes, ensuring sample purity. Baffles and blocking blocks prevent sample spillage and improve collection integrity. This structure eliminates the need for manual screening, reduces subsequent testing procedures, ensures the sample accurately reflects the pile foundation characteristics, and avoids the influence of impurities or breakage on test results, providing high-quality sample support for pile foundation quality assessment. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0016] Figure 1 This is a schematic diagram of a structure in one embodiment of the present disclosure; Figure 2 This is an isometric drawing of the present disclosure; Figure 3 This is an isometric drawing from another perspective of this disclosure; Figure 4 This is an isometric sectional view of the present disclosure; In the diagram: 1. Base plate; 2. Casters; 3. Frame; 4. Sampling cylinder; 5. Drilling assembly; 5-1. Spiral blades; 5-2. Central cutter head; 5-3. Outer cutter head; 5-4. Discharge pipe; 5-5. First receiving hopper; 5-6. Second receiving hopper; 5-7. Screen hole; 5-8. Baffle; 5-9. Blocking block; 6. Retraction and release drive assembly; 6-1. Vertical screw; 6-2. Lifting seat; 6-3. Support; 6-4. Horizontal frame; 6-5. Second screw; 6-6. Groove. Detailed Implementation

[0017] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0018] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0019] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0020] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0022] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] like Figures 1-4 As shown, it illustrates a core sampling device for pile foundation testing according to an embodiment of the present disclosure, comprising: The base plate 1 and several casters 2 are fixed at the four opposite corners of the bottom surface of the base plate 1. The support frame 3, the sampling cylinder 4, and the drilling assembly 5 are provided. The support frame 3 is vertically fixed to the surface of the base plate 1, the sampling cylinder 4 is disposed on the support frame 3, and the drilling assembly 5 is disposed on the sampling cylinder 4. A retraction and extension drive assembly 6 is disposed between the upright frame 3 and the sampling cylinder 4; The drilling assembly 5 includes a spiral blade 5-1, which is disposed inside the sampling cylinder 4. The spiral blade 5-1 is electrically driven to rotate. A central cutter disc 5-2 is disposed at the lower end of the spiral blade 5-1, and an outer ring cutter disc is disposed outside the central cutter disc 5-2. A gap is left between the central cutter disc 5-2 and the outer ring cutter disc. A discharge pipe 5-4 is disposed at the upper end of one side of the sampling cylinder 4. One end of the discharge pipe 5-4 is connected to a first receiving hopper 5-5. A second receiving hopper 5-6 is connected to the outer bottom of the hopper 5-5. The first receiving hopper 5-5 is located inside the second receiving hopper 5-6. A sieve hole 5-7 is opened at the bottom of the first receiving hopper 5-5. The front ends of the first receiving hopper 5-5 and the second receiving hopper 5-6 are rotatably connected to a baffle 5-8 by a pin. Both ends of the surfaces of the first receiving hopper 5-5 and the second receiving hopper 5-6 are rotatably connected to a blocking block 5-9 by a pin. The blocking block 5-9 is attached to the surface of the baffle 5-8.

[0024] In some examples, in order to achieve deep drilling, efficient extraction and accurate screening of pile foundation samples, avoid sample breakage or impurities during drilling, and ensure sampling integrity and testing accuracy, a drilling component 5 was designed. This component includes a spiral blade 5-1 inside the sampling cylinder 4 that is driven by electricity to rotate. Its spiral structure can transport the underground sample upward during drilling.

[0025] The central cutter head 5-2 at the lower end of the spiral blade 5-1 and the outer ring cutter head form a double-layer cutting structure. The central cutter head 5-2 can cut the central area of ​​the pile foundation first, while the outer ring cutter head cuts the outer area of ​​the pile foundation simultaneously. The interval between the two can reduce cutting resistance and avoid wear of the cutter head due to concentrated force. At the same time, it ensures that the cut sample can be completely inserted into the sampling tube 4, thereby improving drilling efficiency and sample integrity.

[0026] The discharge pipe 5-4 at the upper end of one side of the sampling cylinder 4 provides a discharge channel for the sample conveyed by the spiral blade 5-1, ensuring that the sample can be quickly discharged from the sampling cylinder 4 and avoiding the accumulation of sample in the cylinder, which would affect subsequent drilling. The first receiving hopper 5-5 connected to one end of the discharge pipe 5-4 can receive the sample discharged from the pipe. The sieve holes 5-7 at the bottom of the hopper can perform preliminary screening of the sample, separating fine debris from the whole sample, which is convenient for subsequent testing of samples of different particle sizes.

[0027] The second hopper 5-6, located on the outer side of the bottom of the first receiving hopper 5-5, can collect fine debris that leaks through the sieve holes 5-7, enabling graded collection of sample material for sampling and sieving, and preventing impurities from entering and affecting the test results.

[0028] The baffle 5-8, which rotates at the front end of the first receiving hopper 5-5 and the second receiving hopper 5-6 via a pin, can close after sampling to prevent sample spillage. The blocking blocks 5-9, which are rotatably connected at both ends of the surface, fit against the surface of the baffle 5-8 and can fix the position of the baffle 5-8 to prevent the baffle 5-8 from opening on its own due to sample impact during the receiving process, thus ensuring thorough sample collection.

[0029] During operation, the electric drive propels the spiral blades 5-1 and the cutter head to rotate. The cutter head cuts the pile foundation sample, and the spiral blades 5-1 transport the sample upward to the discharge pipe 5-4. The sample enters the first receiving hopper 5-5, and the intact sample remains in the first receiving hopper 5-5. The debris falls into the second receiving hopper 5-6 through the sieve holes 5-7. After sampling is completed, the blocking block 5-9 is rotated to close the baffle 5-8.

[0030] Layered cutting ensures sample integrity, spiral conveying improves discharge efficiency, and graded screening ensures sample purity. All components work together to achieve deep drilling, extraction, and screening of pile foundation samples, providing high-quality samples for pile foundation testing.

[0031] like Figures 1-4 As shown in the figure, the retraction and extension drive assembly 6 in this embodiment includes a vertical screw 6-1, which is electrically driven to rotate vertically and is connected to one side of the upright frame 3. A lifting seat 6-2 is vertically slidably connected inside the upright frame 3. The lifting seat 6-2 and the vertical screw 6-1 are connected by a threaded engagement. A bracket 6-3 is horizontally slidably fitted inside the side surface of the lifting seat 6-2. The two ends of the bracket 6-3 are respectively fixedly connected to the two sides of the outer wall of the sampling cylinder 4. A horizontal frame 6-4 is provided on the side surface of the lifting seat 6-2. A second screw 6-5 driven by electricity is provided inside the horizontal frame 6-4. The bottom of the bracket 6-3 on one side is connected to the second screw 6-5 by a threaded engagement. A notch 6-6 is opened on the surface of the base plate 1. The inner diameter of the notch 6-6 matches the bottom diameter of the sampling cylinder 4.

[0032] In some examples, in order to achieve stable raising and lowering of the sampling cylinder 4 and precise control of the drilling depth, and to avoid sampling failure due to deviation of the sampling cylinder 4 or inaccurate depth control during drilling, and to meet the precise requirements of pile foundation testing for sampling position and depth, a raising and lowering drive assembly 6 was designed. This assembly includes a vertical screw 6-1 that rotates vertically on one side of the frame 3 by electric drive, and a lifting seat 6-2 that slides vertically inside the frame 3 by threaded connection. The electric drive can precisely control the rotation speed of the vertical screw 6-1, thereby driving the lifting seat 6-2 to rise and fall vertically along the frame 3, realizing the raising and lowering of the sampling cylinder 4. When the lifting seat 6-2 rises, it drives the sampling cylinder 4 to retract, which facilitates the movement or adjustment of the equipment position.

[0033] When the lifting seat 6-2 descends, it drives the sampling cylinder 4 to drill downwards. By controlling the number of rotations of the screw, the descent distance of the lifting seat 6-2 can be precisely controlled, thereby controlling the drilling depth of the sampling cylinder 4 and meeting the sampling depth requirements in different testing scenarios.

[0034] The bracket 6-3, which is horizontally slidable within the side surface of the lifting seat 6-2, is fixedly connected at both ends to the outer walls of the sampling cylinder 4. This allows the sampling cylinder 4 to move horizontally, enabling fine-tuning of the sampling position. Inside the horizontal frame 6-4 on the side surface of the lifting seat 6-2, a second screw 6-5 driven by electricity is threadedly connected to the bottom of the bracket 6-3. When the second screw 6-5 rotates, it pushes the bracket 6-3 to slide horizontally along the lifting seat 6-2, thereby adjusting the horizontal position of the sampling cylinder 4. This ensures that the sampling cylinder 4 can accurately align with the pile foundation detection point, avoiding sampling position deviation due to equipment placement errors and improving sampling accuracy.

[0035] The inner diameter of the notch 6-6 on the surface of the base plate 1 matches the bottom diameter of the sampling cylinder 4. When the sampling cylinder 4 is not in use, it can be moved onto the base plate 1, and the central cutter disc 5-2 and the outer ring cutter disc at the bottom can be retracted into the notch 6-6 to achieve the purpose of protection.

[0036] During operation, based on the required testing depth, the electrically driven vertical screw 6-1 lowers the lifting seat 6-2, causing the sampling cylinder 4 to drill downwards. The position of the support 6-3 is adjusted via the second screw 6-5, aligning the sampling cylinder 4 with the testing point. After drilling is complete, the vertical screw 6-1 rotates in the opposite direction, causing the lifting seat 6-2 to rise and retract the sampling cylinder 4. Vertical lifting controls the drilling depth, while horizontal adjustment calibrates the sampling position. The coordinated operation of these components ensures accurate sampling of the pile foundation by controlling the raising and lowering of the sampling cylinder 4 and the drilling depth.

[0037] For example, such as Figure 2 As shown, both the central cutter disc 5-2 and the outer ring cutter disc are located outside the sampling cylinder 4, and both the central cutter disc 5-2 and the outer ring cutter disc are annular structures.

[0038] In some examples, both the central cutter head 5-2 and the outer ring cutter head are located outside the sampling cylinder 4 and are annular structures. This annular structure allows the cutter head to form a circular cutting trajectory during cutting, precisely corresponding to the annular cross-sectional requirements of pile core drilling sampling. This avoids irregular gaps in the cutting area, ensuring that the extracted sample is a complete cylinder and improving the representativeness of the sample testing. The external cutter head design prevents the accumulation of cutting debris inside the sampling cylinder 4, reducing the obstruction of debris to the spiral blades 5-1 in transporting the sample. It also facilitates disassembly and replacement of the cutter head after wear, eliminating the need to disassemble the sampling cylinder 4 and reducing maintenance difficulty.

[0039] For example, such as Figure 1 As shown, the cross-sections of the first receiving hopper 5-5 and the second receiving hopper 5-6 are both U-shaped, and both the first receiving hopper 5-5 and the second receiving hopper 5-6 are inclined downwards.

[0040] In some examples, both the first receiving hopper 5-5 and the second receiving hopper 5-6 have a U-shaped cross-section and slope downwards. The U-shaped structure provides a semi-enclosed guide for the sample, preventing it from spilling from the sides during transport and ensuring that the sample falls completely into the receiving hopper. The downward slope allows gravity to guide the sample to slide naturally down the hopper wall, preventing it from accumulating inside. Intact samples in the first receiving hopper 5-5 can slide down the slope to the bottom for easy removal later; debris in the second receiving hopper 5-6 can also collect along the slope, reducing residue.

[0041] In practical use: Align the notch 6-6 with the sampling position. Activate the retraction drive assembly 6, electrically driving the vertical screw 6-1 to rotate, causing the lifting seat 6-2 to descend vertically along the frame 3. The sampling cylinder 4 moves downward accordingly. Simultaneously, adjust the second screw 6-5 within the horizontal frame 6-4, pushing the bracket 6-3 to move the sampling cylinder 4 horizontally, precisely aligning it with the detection point. Activate the drilling assembly 5, electrically driving the spiral blades 5-1 to rotate. The central cutter head 5-2 and the outer cutter head synchronously cut the pile foundation. The sample is conveyed upward through the spiral blades 5-1 to the discharge pipe 5-4 and enters the first receiving hopper 5-5. The intact sample remains in the first receiving hopper 5-5, while fine debris falls through the sieve holes 5-7 into the second receiving hopper 5-6. During sampling, adjust the drilling depth by controlling the vertical screw 6-1 according to the soil conditions to avoid sample damage. After sampling is completed, the vertical screw 6-1 is rotated in the opposite direction to raise the lifting seat 6-2 and retract the sampling cylinder 4. The blocking block 5-9 is rotated to close the baffle 5-8 to prevent the sample from spilling. Finally, the samples in the two receiving hoppers are taken out for testing. The entire process achieves accurate sampling and sample sieving.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A core sampling device for pile foundation testing, characterized in that, include: The base plate (1) and several casters (2) are fixed at the four opposite corners of the bottom surface of the base plate (1); The support frame (3), sampling tube (4) and drilling assembly (5) are provided. The support frame (3) is vertically fixed to the surface of the base plate (1). The sampling tube (4) is set on the support frame (3). The drilling assembly (5) is set on the sampling tube (4). A take-up and release drive assembly (6) is disposed between the stand (3) and the sampling tube (4); The drilling assembly (5) includes a spiral blade (5-1), which is disposed inside the sampling cylinder (4). The spiral blade (5-1) is driven to rotate by electricity. A central cutter disc (5-2) is disposed at the lower end of the spiral blade (5-1), and an outer ring cutter disc is disposed outside the central cutter disc (5-2). A gap is left between the central cutter disc (5-2) and the outer ring cutter disc.

2. The core sampling device for pile foundation testing according to claim 1, characterized in that, The sampling tube (4) is provided with a discharge pipe (5-4) at the upper end of one side. One end of the discharge pipe (5-4) is connected to a first receiving hopper (5-5). The bottom outer side of the first receiving hopper (5-5) is connected to a second receiving hopper (5-6). The first receiving hopper (5-5) is located inside the second receiving hopper (5-6).

3. The core sampling device for pile foundation testing according to claim 2, characterized in that, The bottom of the first receiving hopper (5-5) is provided with a sieve hole (5-7). The front ends of the first receiving hopper (5-5) and the second receiving hopper (5-6) are rotatably connected to a baffle (5-8) by a pin. Both ends of the surfaces of the first receiving hopper (5-5) and the second receiving hopper (5-6) are rotatably connected to a blocking block (5-9) by a pin. The blocking block (5-9) is attached to the surface of the baffle (5-8).

4. The core sampling device for pile foundation testing according to claim 1, characterized in that, The retraction and extension drive assembly (6) includes a vertical screw (6-1), which is vertically rotatably connected to one side of the frame (3) by electric drive. A lifting seat (6-2) is vertically slidably connected inside the frame (3), and the lifting seat (6-2) is connected to the vertical screw (6-1) by threaded engagement.

5. The core sampling device for pile foundation testing according to claim 4, characterized in that, The lifting seat (6-2) is horizontally slidably connected to a bracket (6-3) on its side surface. The two ends of the bracket (6-3) are respectively fixedly connected to the two sides of the outer wall of the sampling cylinder (4). A horizontal frame (6-4) is provided on the side surface of the lifting seat (6-2).

6. The core sampling device for pile foundation testing according to claim 5, characterized in that, The horizontal frame (6-4) is equipped with a second screw (6-5) driven by electricity. The bottom of the bracket (6-3) on one side is connected to the second screw (6-5) by a threaded engagement. The bottom plate (1) has a groove (6-6) on its surface. The inner diameter of the groove (6-6) matches the bottom diameter of the sampling cylinder (4).

7. The core sampling device for pile foundation testing according to claim 1, characterized in that, The central cutter disc (5-2) and the outer ring cutter disc are both located outside the sampling cylinder (4), and both the central cutter disc (5-2) and the outer ring cutter disc are annular structures.

8. The core sampling device for pile foundation testing according to claim 2, characterized in that, Both the first receiving hopper (5-5) and the second receiving hopper (5-6) have a U-shaped cross-section, and both the first receiving hopper (5-5) and the second receiving hopper (5-6) are inclined downwards.

Images