A device for extracting a cylindrical core sample from a pavement slab

Abstract

The utility model belongs to pavement engineering detection technical field, concretely is a kind of pavement slab cylinder core sample extraction device, including holding lever, arc clamping piece and tightening structure, the arc clamping piece is connected in the bottom end of holding lever, the tightening structure is connected with arc clamping piece, for inward extrusion arc clamping piece, so that arc clamping piece clamps cylinder core sample.The utility model has the advantages of improving the efficiency and quality of pavement slab cylinder core sample extraction, reducing the damage of core sample in extraction process.

Description

Technical Field

[0001] This utility model relates to the field of pavement engineering testing technology; specifically, this utility model relates to a pavement panel cylindrical core sample extraction device. Background Technology

[0002] In the construction, maintenance, and quality assessment of pavement engineering, the extraction of cylindrical core samples from pavement slabs is a crucial step. Currently, the industry commonly uses test block clamps to hold and fix core samples, but this traditional method has revealed significant shortcomings in practice. Pavement construction specifications require that the site be cleaned and an isolation layer laid before concrete pouring, with composite geomembranes being the preferred material due to their excellent impermeability and isolation properties. However, the adhesion characteristics of this material to concrete core samples pose a significant challenge to core sample extraction. During on-site operations, core samples often adhere tightly to the composite geomembrane, making extraction difficult or even impossible. Test block clamps, due to their limited gripping contact area, struggle to provide stable holding force, forcing operators to increase the clamping force. This not only increases the stress on the core sample but also, during core extraction from thicker slabs, the weight of the core sample makes it prone to slipping off the clamp, leading to core sample breakage and damage. Once the integrity of the core sample is compromised, subsequent testing data for key indicators such as compressive strength and splitting tensile strength will lose their representativeness, directly interfering with the scientific assessment of engineering quality and affecting the reliability of test results. Therefore, developing a cylindrical core sample extraction device for pavement slabs is not only a technological innovation to improve testing efficiency and quality, but also a practical necessity to ensure the safe and reliable operation of pavement engineering, possessing significant engineering application value and practical significance. Utility Model Content

[0003] In view of this, the present invention provides a device for extracting cylindrical core samples from pavement panels, which aims to effectively improve the efficiency and quality of extracting cylindrical core samples from pavement panels and reduce damage to the core samples during the extraction process.

[0004] To achieve the aforementioned objective, this utility model provides a device for extracting cylindrical core samples from pavement blocks, comprising a gripping rod, an arc-shaped clamp, and a tightening structure. The arc-shaped clamp is connected to the bottom end of the gripping rod, and the tightening structure is connected to the arc-shaped clamp and is used to squeeze the arc-shaped clamp inward, so that the arc-shaped clamp clamps the cylindrical core sample.

[0005] In the aforementioned device for extracting cylindrical core samples from pavement panels, optionally, the tightening structure includes an annular clamp and a tightening bolt. The annular clamp is fitted over the outside of the arc-shaped clamp, and the tightening bolt connects the two ends of the annular clamp.

[0006] In the aforementioned device for extracting cylindrical core samples from pavement panels, optionally, the arc-shaped clamp and the annular clamp are both steel sheets, and the handle is fixedly connected to the top end of the arc-shaped clamp.

[0007] In the aforementioned device for extracting cylindrical core samples from pavement blocks, optionally, the tightening structure includes a bracket connected to the bottom of the gripping rod, the top end of the arc-shaped clamp is radially slidably connected to the bracket, the bracket is provided with a lifting frame that can be raised and lowered, the surface of the arc-shaped clamp is provided with a wedge-shaped block with the top end inclined outward, and when the lifting frame moves upward, it squeezes the wedge-shaped block to cause the arc-shaped clamp to move inward and clamp the cylindrical core sample.

[0008] In the aforementioned device for extracting cylindrical core samples from pavement panels, optionally, one wedge block is provided at each of the upper and lower ends of the arc-shaped clamping plate, and a pressure roller is provided on the lifting frame corresponding to each of the two wedge blocks.

[0009] In the aforementioned device for extracting cylindrical core samples from pavement panels, optionally, a pad with a flat outer surface is fixedly provided on the surface of the arc-shaped clamping plate, an annular groove is provided in the middle of the pressure roller, the inner walls of the two sides of the annular groove are respectively attached to the two sides of the pad, and two wedge blocks are respectively fixedly provided at the upper and lower ends of the pad.

[0010] In the aforementioned device for extracting cylindrical core samples from pavement panels, optionally, the bottom end of the gripping rod is rotatably connected to the center of the support, the vertical section of the gripping rod is configured as a screw, a threaded sleeve is fitted on the outer thread of the vertical section of the gripping rod, a lifting plate is rotatably fitted on the outer side of the threaded sleeve, and the top end of the lifting frame is fixedly connected to the lifting plate.

[0011] In the aforementioned device for extracting cylindrical core samples from pavement panels, optionally, a rubber layer is provided on the inner surface of the arc-shaped clamp.

[0012] The present invention has the following advantages over the prior art:

[0013] The application of this pavement block cylindrical core sample extraction device improves the efficiency and quality of pavement block cylindrical core sample extraction, avoids core sample damage caused by detachment during the extraction process, reduces the number of repeated core extractions, and ensures the reliability of test results. The device has a simple structural design and is easy and quick to operate. It is applicable to the testing of various pavement projects such as highways and airport runways and has broad application prospects. Attached Figure Description

[0014] The disclosure of this utility model will become more apparent with reference to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings:

[0015] Figure 1 This is a front view of Embodiment 1 of the present utility model;

[0016] Figure 2This is a top view of Embodiment 1 of the present utility model;

[0017] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0018] Figure 4 This is a split diagram of Embodiment 2 of the present invention.

[0019] Reference numerals: 1-Holding bar; 2-Arc-shaped clamp; 3-Ring clamp; 4-Tightening bolt; 5-Bracket; 6-Lifting frame; 7-Wedge block; 8-Pressure roller; 9-Pad; 10-Threaded sleeve; 11-Lifting plate; 12-Rubber layer. Detailed Implementation

[0020] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] like Figure 1 and Figure 2 As shown in the figure, this embodiment provides a cylindrical core sample extraction device for pavement blocks, including a gripping rod 1, an arc-shaped clamping piece 2, and a tightening structure. The arc-shaped clamping piece 2 is connected to the bottom end of the gripping rod 1, and the tightening structure is connected to the arc-shaped clamping piece 2 to squeeze the arc-shaped clamping piece 2 inward, so that the arc-shaped clamping piece 2 clamps the cylindrical core sample.

[0022] In use, move the device above the core sample, align the center of the arc-shaped clamp 2 with the core sample, lower the arc-shaped clamp 2 to a certain height, tighten the tightening structure so that the arc-shaped clamp 2 holds the core sample tightly, and then lift the entire device upward through the handle 1 to smoothly lift the core sample out.

[0023] Specifically, in this embodiment, the tightening structure includes an annular clamp 3 and a tightening bolt 4. The annular clamp 3 is fitted over the arc-shaped clamp 2, and the tightening bolt 4 connects the two ends of the annular clamp 3. After the core sample is fitted onto the arc-shaped clamp 2, rotating the tightening bolt 4 causes the annular clamp 3 to retract inward, thereby squeezing the arc-shaped clamp 2 inward and clamping the core sample tightly.

[0024] Both the arc-shaped clamp 2 and the ring clamp 3 are made of steel sheets, and the handle 1 is fixedly connected to the top of the arc-shaped clamp 2. The steel pipe is made of stainless steel, with a diameter of 30mm and a length of 120mm, and is connected to the arc-shaped clamp 2 below by welding. In use, the core sample is extracted by holding the handle 1 and lifting the device vertically upward.

[0025] The arc-shaped clamp 2 is made of stainless steel plate with a thickness of 3mm. Its function is to hold the core sample. After adjusting the tightening bolt 4, it holds the core sample tightly, making it easy to extract.

[0026] The tightening screw is an M8×1.0×100 metric hexagonal head bolt with a nominal thread diameter of 8mm, a thread pitch of 1mm, and a length of 100mm. Nuts of type M8×1.0 can be welded to both ends of the annular clamp 3. The two welded nuts are connected by the tightening bolt 4, and the annular clamp 3 is tightened by screwing.

[0027] like Figure 3 and Figure 4 As shown, in Embodiment 2, the tightening structure includes a bracket 5 connected to the bottom of the grip 1, the top of the arc-shaped clamp 2 is radially slidably connected to the bracket 5, the bracket 5 is provided with a lifting frame 6 that can be raised and lowered, the surface of the arc-shaped clamp 2 is provided with a wedge block 7 with the top inclined outward, when the lifting frame 6 moves upward, it squeezes the wedge block 7 to make the arc-shaped clamp 2 move inward to clamp the cylindrical core sample.

[0028] In use, the arc-shaped clamp 2 is fitted onto the core sample, then the bracket 5 is placed on top of the core sample. The lifting frame 6 then moves upwards. As the lifting frame 6 passes the wedge block 7, it presses the wedge block 7 inwards. At this point, the wedge block 7 causes the arc-shaped clamp 2 to move inwards and clamp the core sample. Then, the core sample can be removed by simply lifting the handle 1. Compared to embodiment one, the tightening structure of this embodiment eliminates the need to rotate the tightening bolt 4, making operation more convenient.

[0029] Furthermore, one wedge block 7 is provided at each of the upper and lower ends of the arc-shaped clamping piece 2, and a pressure roller 8 is provided on the lifting frame 6 corresponding to each of the two wedge blocks 7. By providing the pressure roller 8, when the lifting frame 6 squeezes the wedge block 7, the pressure roller 8 rolls on the inclined surface of the wedge block 7, so that the lifting frame 6 can apply pressure to the wedge block 7 more smoothly.

[0030] More specifically, a pad 9 with a flat outer surface is fixedly mounted on the surface of the arc-shaped clamp 2. An annular groove is provided in the middle of the pressure roller 8, and the inner walls of the two sides of the annular groove are respectively attached to the two sides of the pad 9. Two wedge-shaped blocks 7 are respectively fixedly mounted at the upper and lower ends of the pad 9. Through the cooperation between the pressure roller 8 and the pad 9, the lifting frame 6 can limit the arc-shaped clamp 2 in the circumferential direction, thereby improving the stability of the arc-shaped clamp 2.

[0031] The bottom end of the grip 1 is rotatably connected to the center of the bracket 5. The vertical section of the grip 1 is screw-shaped, and a threaded sleeve 10 is fitted onto the outer thread of the vertical section of the grip 1. A lifting plate 11 is rotatably fitted onto the outer side of the threaded sleeve 10, and the top end of the lifting frame 6 is fixedly connected to the lifting plate 11. With this configuration, simply rotating the grip 1 causes the threaded sleeve 10 to move upward. At this time, the threaded sleeve 10, through the lifting plate 11, causes the lifting frame 6 to move upward, causing the pressure roller 8 to press the wedge block 7 inward. In turn, the wedge block 7 causes the arc-shaped clamp 2 to hold the core sample tightly. With the above configuration, the entire sampling process only requires operating the grip 1, making it more convenient to operate.

[0032] In the two embodiments described above, the inner surface of the arc-shaped clamp 2 is provided with a rubber layer 12. The rubber layer 12 can increase the clamping area and friction of the core sample, ensuring stable sampling and improving sampling efficiency.

[0033] The technical scope of this utility model is not limited to the contents of the above description. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the scope of this utility model.

Claims

1. A device for extracting cylindrical core samples from pavement panels, characterized in that, It includes a grip (1), an arc-shaped clamp (2) and a tightening structure. The arc-shaped clamp (2) is connected to the bottom end of the grip (1). The tightening structure is connected to the arc-shaped clamp (2) and is used to squeeze the arc-shaped clamp (2) inward so that the arc-shaped clamp (2) clamps the cylindrical core sample.

2. The device for extracting cylindrical core samples from pavement panels as described in claim 1, characterized in that, The tightening structure includes an annular clamp (3) and a tightening bolt (4). The annular clamp (3) is sleeved on the outside of the arc-shaped clamp (2), and the tightening bolt (4) connects the two ends of the annular clamp (3).

3. The device for extracting cylindrical core samples from pavement panels as described in claim 1, characterized in that, Both the arc-shaped clamp (2) and the ring clamp (3) are steel sheets, and the handle (1) is fixedly connected to the top of the arc-shaped clamp (2).

4. The device for extracting cylindrical core samples from pavement panels as described in claim 1, characterized in that, The tightening structure includes a bracket (5) connected to the bottom of the grip (1). The top of the arc-shaped clamp (2) is radially slidably connected to the bracket (5). The bracket (5) is provided with a lifting frame (6) that can be raised and lowered. The surface of the arc-shaped clamp (2) is provided with a wedge block (7) with the top inclined outward. When the lifting frame (6) moves upward, it squeezes the wedge block (7) to make the arc-shaped clamp (2) move inward to clamp the cylindrical core.

5. The device for extracting cylindrical core samples from pavement panels as described in claim 4, characterized in that, One wedge block (7) is provided at both the upper and lower ends of the arc-shaped clamp (2), and a pressure roller (8) is provided on the lifting frame (6) corresponding to each of the two wedge blocks (7).

6. The device for extracting cylindrical core samples from pavement panels as described in claim 5, characterized in that, The surface of the arc-shaped clamp (2) is fixedly provided with a pad (9) with a flat outer side. The middle part of the pressure roller (8) is provided with an annular groove. The inner walls of the two sides of the annular groove are respectively attached to the two sides of the pad (9), and two wedge blocks (7) are respectively fixedly provided at the upper and lower ends of the pad (9).

7. The device for extracting cylindrical core samples from pavement panels as described in claim 4, characterized in that, The bottom end of the grip (1) is rotatably connected to the center of the bracket (5). The vertical section of the grip (1) is set as a screw. The external thread of the vertical section of the grip (1) is fitted with a screw sleeve (10). The external rotatable sleeve of the screw sleeve (10) is fitted with a lifting plate (11). The top end of the lifting frame (6) is fixedly connected to the lifting plate (11).

8. A device for extracting cylindrical core samples from road surface blocks as described in claim 1 or 4, characterized in that, The inner surface of the arc-shaped clip (2) is provided with a rubber layer (12).

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