Concrete coring device for building safety inspection
By designing a robust gripper and pull rod connection structure, combined with friction components and reset adjustment components, the problem of loosening in existing core sampling devices has been solved, achieving stable clamping and simplified operation, and adapting to the needs of concrete core samples of different diameters.
Patent Information
- Application Number
- CN202521980874.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-15
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-09-15
AI Technical Summary
Existing concrete core sampling devices are prone to loosening during clamping and extraction, leading to damage to the core sample. They also rely heavily on the operator's experience, making operation difficult.
A core extraction device including a top cover, grippers, a pull rod, and a friction assembly is designed. The grippers are connected to the pull rod via a connecting rod. The pull rod achieves stable clamping through a reset assembly and an adjustment assembly. The friction assembly increases the clamping force and ensures the friction between the grippers and the core sample.
It improves the stability and reliability of clamping, reduces the risk of core sample falling and being damaged, makes operation simpler and more worry-free, and adapts to the needs of different core sample diameters.
Smart Images
Figure CN224681841U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of concrete sampling, and in particular relates to a concrete core sampling device for building safety testing. Background Technology
[0002] Concrete core sampling is a core method for building safety testing, directly assessing concrete quality by drilling and extracting solid core samples. Its main functions include: verifying actual strength to ensure the structural load-bearing capacity meets design requirements; revealing internal defects, such as hidden problems like voids and segregation, providing a basis for repair; assessing durability by detecting indicators such as chloride ion penetration and carbonation to predict structural lifespan; supporting project acceptance and dispute resolution by clarifying quality responsibility with objective data; optimizing construction and materials, providing feedback on process defects, and promoting technological improvements. This method is direct, reliable, and applicable throughout the entire building lifecycle, making it a key technical means to ensure structural safety and extend service life.
[0003] After successfully drilling a hole in a building using drilling equipment, a core sampling device is usually needed to remove the concrete core sample from the hole. Most existing core sampling devices are clamp-type core clamps, which adjust the tightness of the clamp on the concrete core sample by adjusting the angle between the two handles. After clamping, the concrete core sample is removed from the hole by pulling the core clamp upwards. Although this method can effectively remove the concrete core sample, during the clamping process, the two handles of the core clamp are tilted downwards or vertically. The operator must both forcefully swing the two handles inwards to maintain the clamping force and pull the handles upwards. During the lifting process, the downward tilted or vertical handles are very easy to slip from the operator's hands, causing the concrete core sample to fall and be damaged, affecting the quality of the sample. This operation method is quite difficult and highly dependent on the operator's experience. Utility Model Content
[0004] The purpose of this invention is to provide a concrete core sampling device for building safety testing, which is simple to use and more stable in clamping and extracting concrete core samples, making it less prone to loosening.
[0005] The aforementioned concrete core sampling device for building safety testing includes a top cover with an opening facing downwards. Several grippers evenly distributed along the circumference are hinged to the bottom of the top cover. Each gripper has a detachable friction component at its lower end to enhance friction. A through hole is provided at the center of the top of the top cover, through which a vertically movable pull rod is independently inserted. A connecting rod is hinged between the lower end of the pull rod and the middle section of each gripper. A lifting frame is fixed on the top cover, and a handle is fixed to the top of the pull rod, located inside the lifting frame. A reset component is provided on the top cover to drive the pull rod to move downwards and reset after it has moved upwards. An adjustment component is provided on the top cover to adjust the length of the pull rod that can pass through the through hole.
[0006] Furthermore, the friction assembly includes a mounting plate, with a mounting groove at the lower end of the inward-facing sidewall of the gripper, the mounting plate engaging in the mounting groove, a plurality of protruding teeth fixed on the inward-facing sidewall of the mounting plate, and a threaded rod horizontally fixed on the outward-facing sidewall of the mounting plate, the gripper having a through hole for the threaded rod to pass through, and a nut fitted on the end of the threaded rod passing through the through hole.
[0007] Furthermore, the reset assembly includes a retaining ring fitted onto the lower end of the pull rod, and a spring fitted onto the pull rod, the spring being located between the retaining ring and the inner top of the upper cover.
[0008] Furthermore, the adjustment component includes a threaded sleeve, a positioning tube independently fitted on the pull rod, the bottom of the positioning tube being fixed to the top of the upper cover, an external thread being provided on the middle section of the pull rod, the threaded sleeve being fitted on the pull rod and threadedly engaged with the external thread, and the threaded sleeve being located above the positioning tube.
[0009] Furthermore, a bevel is provided at the corner between the inner wall and the top of the positioning tube.
[0010] Furthermore, the handle has a downward-curving arc-shaped structure.
[0011] Furthermore, the cross-section of the gripper has an arc-shaped structure.
[0012] Furthermore, the lifting frame has an inverted "U" shape that narrows at the bottom, and a protective sleeve is fitted on the top horizontal section of the lifting frame.
[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. When using the product, the operator can grip the horizontal section of the lifting frame with both hands, with all fingers wrapped around the handle. By pulling upwards with the fingers, the handle is moved upwards, which in turn causes the corresponding grippers on each connecting rod to swing inwards to clamp the concrete core sample. This gripping method is more stable and reliable, effectively preventing the handle or lifting frame from slipping out of the hand. When retrieving the concrete core sample, the handle is supported by the upward pull of the operator's hands and the overall weight of the concrete core sample, which can more firmly clamp and fix the concrete core sample. It is also more stable when clamping and retrieving the concrete core sample, making it less likely to loosen, thereby reducing the risk of the concrete core sample falling and being damaged.
[0014] 2. The friction component can effectively increase the friction between the gripper and the concrete core sample, further reducing the possibility of the concrete core sample slipping during clamping. It can be replaced after long-term use to ensure the friction effect between the gripper and the concrete core sample.
[0015] 3. When performing concrete core sampling for the first time, the operator first adjusts the length of the lower end of the pull rod through the hole using the adjustment component according to the diameter of the concrete core sample. Then, the operator adjusts the maximum extent to which all the grippers swing outward to accommodate the diameter of the concrete core sample, so that concrete core samples of the same diameter can be directly clamped in the future.
[0016] 4. After the concrete core sample is removed, when the operator releases the pulling force on the handle, the reset component will drive the pull rod to move down and return to the adjusted initial state. This allows the operator to use this concrete core sampling device without having to manually restore all the grippers to the adjusted maximum extension, making the concrete core sampling operation more convenient and worry-free. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 Enlarged view of region a in the middle; Figure 3 for Figure 1 Enlarged view of region b in the middle; Figure 4 This is a perspective view of the present utility model; Figure 5 This is an exploded view of the present invention; The components in the diagram are named as follows: 1. Top cover; 2. Lifting frame; 3. Pull handle; 4. Protective cover; 5. Pull rod; 6. Threaded sleeve; 7. Positioning tube; 8. Connecting rod; 9. Gripper; 10. Spring; 11. Retaining ring; 12. Mounting plate; 13. Raised tooth. Detailed Implementation
[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
[0019] Example This embodiment describes a concrete core sampling device for building safety testing, such as... Figure 1 , Figure 2 and Figure 5 As shown, the device includes a top cover 1 with its opening facing downwards. The bottom of the top cover 1 is hinged with several grippers 9 evenly distributed along the circumference. In this embodiment, there are four sets of grippers 9, evenly distributed along the circumference of the top cover 1. All grippers 9 are pivotally hinged to the top cover 1, as shown below. Figure 1 and Figure 5As shown, the bottom of the upper cover 1 has four openings evenly distributed along the circumference. The side walls of the openings have mounting holes. Each gripper 9 has a horizontally fixed pivot on its upper side wall for insertion into the corresponding mounting hole, thereby hinged the upper end of the gripper 9 to the bottom of the upper cover 1, so that all grippers 9 can swing around the hinge point. When the lower end of the gripper 9 swings inward synchronously, it can clamp the concrete core sample located in the middle. To elaborate further, such as Figure 3 and Figure 5 As shown, in this embodiment, a preferred embodiment includes a mounting plate 12, and a mounting groove is provided at the lower end of the inward-facing side wall of the gripper 9; as shown Figure 1 , Figure 3 and Figure 5 As shown, the mounting groove is located on the lower end of the side wall of the clamp 9 facing the direction of the concrete core sample; the mounting plate 12 is engaged in the mounting groove, as shown. Figure 3 As shown, there is a gap between the side wall of the mounting plate 12 and the wall of the mounting groove to facilitate the placement and removal of the mounting plate 12; several protruding teeth 13 are fixed on the inward-facing side wall of the mounting plate 12, such as... Figure 3 and Figure 5 As shown, all the protruding teeth 13 are evenly distributed on the sidewall of the mounting plate 12 facing the direction of the concrete core sample, and as... Figure 3 As shown, the protruding teeth 13 have a conical structure, with the tips of all protruding teeth 13 pointing towards the concrete core sample; a threaded rod is horizontally fixed on the outer sidewall of the mounting plate 12, and a through hole is provided on the jaw 9 for the threaded rod to pass through, with a nut fitted on the end of the threaded rod that passes through the through hole; as shown Figure 3 and Figure 5 As shown, when the mounting plate 12 is placed in the mounting groove, the threaded rod passes through the through hole, and the threaded rod is fixed by rotating the nut, thereby locking the mounting plate 12 in the mounting groove; as Figure 3 As shown, the outer sidewall of the clamp 9 has a recessed groove for engaging the nut along the edge of the through hole, as indicated. Figure 3As shown, the nut is hidden by a recessed groove to avoid interference during use. During use, when the lower ends of all the jaws 9 are clamped on the side wall of the concrete core sample, the protruding teeth 13 on each mounting plate 12 will engage with the pits, gaps, or holes on the side wall surface of the concrete core sample, thereby effectively increasing the friction between the jaws 9 and the concrete core sample, improving the gripping force of the jaws 9 on the concrete core sample, and further reducing the possibility of the concrete core sample slipping during clamping. After long-term use, the protruding teeth 13 will wear out. Therefore, the mounting plate 12 can be unlocked by rotating the disassembly nut, the old mounting plate 12 can be removed from the mounting groove, and the new mounting plate 12 can be placed in the mounting groove with its threaded rod inserted into the through hole. The threaded rod can be engaged by rotating the nut. The new mounting plate 12 is fixed in the mounting groove to ensure the friction effect between the gripper 9 and the concrete core sample. This solution constitutes a friction assembly to improve friction. Of course, the friction assembly can also use a rubber sleeve. Each gripper 9 has a rubber sleeve fitted on its lower end. All grippers 9 have slots on the lower end of their sidewalls facing the concrete core sample. Corresponding to the slots, there are locking blocks fixed on the inner wall of the rubber sleeve to engage with the slots. The locking blocks can effectively position the rubber sleeve and prevent it from slipping off the gripper 9. At the same time, anti-slip textures can be made on the outer wall of the rubber sleeve to improve the friction effect between the rubber sleeve and the concrete core sample. If the rubber sleeve wears out significantly in the future, it can be removed and replaced to ensure the friction effect between the gripper 9 and the concrete core sample.
[0020] A through hole is provided at the center of the top of the upper cover 1, and a pull rod 5 that can move up and down is independently installed through the through hole. Figure 1 and Figure 5 As shown, there is a gap between the perforated hole wall and the pull rod 5, which allows the pull rod 5 to move up and down for adjustment; A connecting rod 8 is hinged between the lower end of the pull rod 5 and the middle section of each gripper 9; in this embodiment, the two ends of each connecting rod 8 are respectively hinged to the lower end of the pull rod 5 and the middle section of the gripper 9 via pivots, such as... Figure 5 As shown, a first hinge seat is fixed on the lower end of the side wall of the pull rod 5, and a second hinge seat is fixed on the middle section of the gripper 9. A pivot is fixed on both the first and second hinge seats. Hinge holes for mounting the pivot are opened at both ends of the connecting rod 8, so that the connecting rod 8 can swing around the two hinge points. When the pull rod 5 moves upward, it will pull all the connecting rods 8. Through each connecting rod 8, the gripper 9 at the corresponding position can be pulled to swing inward to clamp. When the pull rod 5 moves downward, it will push all the connecting rods 8. Through each connecting rod 8, the gripper 9 at the corresponding position can be pushed to swing outward to unfold. The cross-section of the gripper 9 is arc-shaped, so that the end of the gripper 9 can adapt to the shape of the gap when it is inserted into the sampling hole, making it easier for the end of the gripper 9 to enter the gap of the sampling hole. A lifting frame 2 is fixed on the top cover 1, such as Figure 1 As shown, the lifting frame 2 has an inverted "U"-shaped structure that tapers at the bottom. This structure helps to increase the length of the top horizontal section, giving the operator enough space to hold the top horizontal section of the lifting frame 2, making it more stable when lifting the concrete core sampling device upwards. A protective sleeve 4 is fitted on the top horizontal section of the lifting frame 2. The protective sleeve 4 is made of rubber, silicone, or foam. The protective sleeve 4 made of the above materials can effectively improve the operator's comfort when holding it and reduce the discomfort of the operator's hand when lifting the lifting frame 2. A handle 3 is fixed to the top of the lever 5, and the handle 3 is located inside the lifting frame 2; as shown Figure 1 and Figure 4 As shown, the handle 3 is located in the middle of the lifting frame 2, and the handle 3 is aligned with the horizontal section at the top of the lifting frame 2. During use, the operator can grip the horizontal section of the lifting frame 2 with both hands, with all fingers wrapped around the handle 3, and pull upwards to move the handle 3 upwards. This, in turn, causes the corresponding clamps 9 on each connecting rod 8 to swing inwards to clamp the concrete core sample. This gripping method is more stable and reliable, effectively preventing the handle 3 or the lifting frame 2 from slipping from the hand, thus reducing the risk of the concrete core sample falling and being damaged. When the operator puts the concrete... When the core sampling device is pulled upwards to prepare to remove the concrete core sample from the hole, the overall weight of the concrete core sample acts on the handle 3. Under the added weight, the handle 3 pulls the lever 5 upwards, allowing all the grippers 9 to clamp and fix the concrete core sample more forcefully. The handle 3 has the support of the operator's hand pulling force and the overall weight of the concrete core sample, which can clamp and fix the concrete core sample more firmly. It is also more stable when clamping and removing the concrete core sample, and it is not easy to loosen, thereby reducing the risk of the concrete core sample falling and being damaged. The handle 3 has a downward-curving arc structure, such as... Figure 1 and Figure 5 As shown, this effectively prevents the operator's fingers from slipping towards both ends when wrapped around the handle 3, reducing the risk of the handle 3 falling off the hand; To elaborate further, such as Figure 1 , Figure 2 and Figure 5As shown, this embodiment preferably includes a retaining ring 11, which is fitted onto the lower end of the pull rod 5. A spring 10 is fitted onto the pull rod 5, located between the retaining ring 11 and the inner top of the upper cover 1. In this embodiment, when the pull rod 5 moves upward, causing the corresponding grippers 9 to swing inward and clamp the concrete core sample via each connecting rod 8, the spring 10 will contract under the pressure of the retaining ring 11. After the concrete core sample is removed, when the operator releases the pulling force on the pull handle 3, the spring 10 will push the retaining ring 11 downward through its own elasticity. The retaining ring 11 then drives the pull rod 5 downward, causing the pull rod 5 to return to its adjusted position. The initial state is designed so that operators do not need to manually restore all the grippers 9 to their extended position when using this concrete core sampling device, making concrete core sampling operations more convenient and worry-free. The overall structure of this solution constitutes a reset assembly for driving the pull rod 5 to move downward and reset after it has moved upward. Of course, the reset assembly can also be a tension spring, with both ends of the tension spring fixed to the handle 3 and the upper cover 1, respectively. When the pull rod 5 moves the handle 3 upward, the handle 3 will pull the tension spring to stretch. When the operator releases the pulling force applied to the handle 3, the tension spring will pull the handle 3 downward through its own elasticity, thereby driving the pull rod 5 downward until all the grippers 9 are restored to their extended position.
[0021] To elaborate further, such as Figure 1 , Figure 4 and Figure 5 As shown, in this preferred embodiment, a threaded sleeve 6 is included, and a positioning tube 7 is independently fitted onto the pull rod 5. The bottom of the positioning tube 7 is fixed to the top of the upper cover 1. An external thread is provided on the middle section of the pull rod 5. The threaded sleeve 6 is fitted onto the pull rod 5 and is threadedly engaged with the external thread. The threaded sleeve 6 is located above the positioning tube 7. Because the rotary drum on the drilling equipment can be divided into different diameters according to the testing requirements, the diameter of the drilled concrete core sample will also be different. However, in this embodiment, the position of the threaded sleeve 6 on the pull rod 5 can be adjusted by rotation, and the positioning tube 7 can block the threaded sleeve 6 to limit the pull rod 5 from moving downwards. The length of the perforation through which the end passes is adjusted, thereby controlling the maximum outward swing of all grippers 9 to accommodate different concrete core sample diameters and improve applicability. Especially when using a rotary drum of the same diameter for multiple sampling points, the maximum extension of all grippers 9 can be adjusted to suit the diameter of the concrete core sample. Under the action of the reset component, the grippers 9 will automatically extend to the adjusted maximum extent. Operators do not need to manually adjust the extension of the grippers 9; they can directly clamp the sample after picking it up, making concrete core sampling simpler, more convenient, and more time-saving. Figure 1As shown, a bevel is provided at the corner between the inner wall and the top of the positioning tube 7. The bevel prevents jamming and interference between the thread and the corner when the pull rod 5 moves down, making the movement of the pull rod 5 smoother. This solution constitutes an adjustment component for adjusting the length of the lower end of the pull rod 5 that can pass through the through hole. Of course, the adjustment component can also use screws. Several equally spaced threaded holes are provided on the outer wall of the pull rod 5 along its length. By changing the screws and inserting them into the threaded holes at different positions, the top of the cover 1 blocks the screws, thereby adjusting the length of the lower end of the pull rod 5 that passes through the through hole, and thus adjusting the maximum extent to which all the grippers 9 swing and unfold.
[0022] In actual use, during the first concrete core sampling, the operator first adjusts the position of the threaded sleeve 6 on the pull rod 5 according to the diameter of the concrete core sample. The positioning tube 7 blocks the threaded sleeve 6 to limit the length of the hole through which the lower end of the pull rod 5 passes. Then, the operator adjusts the maximum outward swing of all the grippers 9 to accommodate the diameter of the concrete core sample, facilitating the subsequent direct clamping of concrete core samples of the same diameter. Afterward, the lower ends of all the grippers 9 are inserted into the drilled sampling hole. Once the insertion depth is appropriate, the operator can grip the lifting frame 2 with both hands. On the horizontal section, all fingers wrap around the handle 3 and pull upwards, causing the handle 3 to move upwards. The handle 3 then moves the lever 5 upwards, and the lever 5, through all connecting rods 8, causes the corresponding grippers 9 to swing inwards at the same angle to clamp the concrete core sample. At the same time, the overall weight of the concrete core sample acts on the handle 3, and the handle 3, under the added weight, pulls the lever 5 upwards, allowing all grippers 9 to clamp and fix the concrete core sample more forcefully. When the lower end of each gripper 9 swings and clamps the concrete core sample, it corresponds to the protruding teeth on the mounting plate 12. 13 will engage with the pits, gaps, or holes on the side wall surface of the concrete core sample, thereby effectively increasing the friction between the gripper 9 and the concrete core sample, improving the gripping force of the gripper 9 on the concrete core sample, and further reducing the possibility of the concrete core sample slipping during clamping; after clamping the concrete core sample, the operator can remove the concrete core sample from the sampling hole and transfer it; after using this concrete core sampling device, when the operator releases the pulling force on the pull handle 3, the spring 10 will push the retaining ring 11 downward through its own elasticity, and the retaining ring 11 will drive the pull rod 5 downward, so that the pull... The lever 5 moves down to return to its initial adjusted state, so that the operator does not need to manually restore all the grippers 9 to their maximum extended position when using this concrete core sampling device, making the concrete core sampling operation more convenient and worry-free. The pull handle 3 of this concrete core sampling device for building safety inspection has the support of the operator's hand pull force and the overall weight of the concrete core sample, which can more firmly clamp and fix the concrete core sample. It is also more stable when clamping and removing the concrete core sample, and is not easy to loosen, thereby reducing the risk of the concrete core sample falling and being damaged.
Claims
1. A concrete core sampling device for building safety testing, comprising a top cover (1) with an opening facing downwards, characterized in that: The bottom of the cover (1) is hinged with several grippers (9) evenly distributed along the circumference. Each gripper (9) has a friction component for increasing friction at its lower end. The top center of the cover (1) has a through hole that is open from top to bottom. A pull rod (5) that can move up and down is independently installed in the through hole. A connecting rod (8) is hinged between the lower end of the pull rod (5) and the middle section of each gripper (9). A lifting frame (2) is fixed on the cover (1). A handle (3) is fixed on the top of the pull rod (5). The handle (3) is located inside the lifting frame (2). The cover (1) is provided with a reset component for driving the pull rod (5) to move down and reset after moving up. The cover (1) is provided with an adjustment component for adjusting the length of the lower end of the pull rod (5) that can pass through the through hole.
2. The concrete core sampling device for building safety testing according to claim 1, characterized in that: The friction assembly includes a mounting plate (12), and a mounting groove is provided at the lower end of the inward-facing side wall of the gripper (9). The mounting plate (12) is engaged in the mounting groove. Several protruding teeth (13) are fixed on the inward-facing side wall of the mounting plate (12). A threaded rod is horizontally fixed on the outward-facing side wall of the mounting plate (12). A through hole is provided on the gripper (9) for the threaded rod to pass through. A nut is fitted on one end of the threaded rod that passes through the through hole.
3. The concrete core sampling device for building safety testing according to claim 1, characterized in that: The reset assembly includes a retaining ring (11) which is fitted onto the lower end of the pull rod (5). A spring (10) is fitted onto the pull rod (5) and is located between the retaining ring (11) and the inner top of the cover (1).
4. The concrete core sampling device for building safety testing according to claim 1, characterized in that: The adjustment assembly includes a threaded sleeve (6), a positioning tube (7) is independently fitted on the pull rod (5), the bottom of the positioning tube (7) is fixed on the top of the cover (1), an external thread is provided on the middle section of the pull rod (5), the threaded sleeve (6) is fitted on the pull rod (5) and is threadedly engaged with the external thread, and the threaded sleeve (6) is located above the positioning tube (7).
5. The concrete core sampling device for building safety testing according to claim 4, characterized in that: The positioning tube (7) has a beveled surface at the corner between the inner wall and the top.
6. The concrete core sampling device for building safety testing according to claim 1, characterized in that: The handle (3) has a downward-curving arc structure.
7. The concrete core sampling device for building safety testing according to claim 1, characterized in that: The cross-section of the gripper (9) is an arc-shaped structure.
8. The concrete core sampling device for building safety testing according to claim 1, characterized in that: The lifting frame (2) has an inverted "U" shaped structure that narrows at the bottom, and a protective sleeve (4) is fitted on the top horizontal section of the lifting frame (2).