A sampling device for construction inspection of steel structure concrete in building engineering

Abstract

The present invention relates to the technical field of concrete sampling, and discloses a sampling device for the construction inspection of steel structure concrete in building engineering, including a drilling cylinder. A connecting handle is arranged at the top of the drilling cylinder, and a lining cylinder is fixedly nested inside the bottom of the drilling cylinder. Drilling teeth are arranged at equal intervals on the common bottom of the lining cylinder and the drilling cylinder. A pair of cutting units are symmetrically arranged at the upper center of the lining cylinder; the cutting unit includes a chain saw. One end of the chain saw is hinged to the upper end face of the lining cylinder through a connecting rod one, and the other end is hinged with a friction assembly, and the friction assembly slides along the upper end face of the lining cylinder; when the drilling cylinder rotates forward, the core column does not drive the friction assembly to slide, and the chain saw does not cut the core column; when the drilling cylinder rotates reversely, the core column drives the friction assembly to slide in the opposite direction of the drilling cylinder, and the chain saw is tensioned and cuts the core column. This device utilizes a structure that automatically tensions and truncates the bottom of the core column when the drilling cylinder rotates reversely, avoiding the damage of the sample core caused by vibration and ensuring the integrity of the sample core.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete sampling, and particularly to a sampling device for the construction inspection of steel structure concrete in construction projects. Background Art

[0002] A concrete core drilling sampling device is a special equipment for drilling cylindrical core samples from concrete structures (such as beams, columns, floor slabs, etc.), mainly used for strength testing, quality assessment or durability analysis. This device usually consists of a drilling machine main body, a diamond drill bit, a cooling system (water-cooled or air-cooled), and core sampling auxiliary tools. The drill bit rotates at high speed to cut the concrete, forming a core sample of standard size (common diameter 50 - 150 mm). After sampling, a gripper or expansion mechanism is needed to completely take out the core sample from the hole to ensure that it is not damaged.

[0003] In the patent with the patent publication number CN118603635A, a pavement concrete core drilling sampling device and its usage method are disclosed. The present invention includes an installation table; a lifting mechanism is installed on the bottom surface of the installation table, and a sampling mechanism is installed on the lifting mechanism; the sampling mechanism includes a rotating component, a driving component is installed in the rotating component, and an inclined component is arranged between the driving component and the rotating component; the driving component is connected with a drill barrel component; the drill barrel component includes an inner barrel, an outer barrel is sleeved outside the inner barrel, a limiting groove is opened on the periphery of the inner barrel, and a clamping component is arranged on the inner wall of the outer barrel; a clamping piece is arranged in the limiting groove; in the present invention, through the coordinated setting of the rotating component, the driving component, the drill barrel component and the inclined component, the formed concrete column can be directly taken out from the cut hole after core drilling on the road surface.

[0004] The existing technology has the following defects:

[0005] After the existing concrete core drilling sampling machine finishes drilling, it usually requires manual knocking to truncate the bottom of the core sample and the use of a special core sampler or clamping tool to assist in taking it out. This method has obvious limitations. First of all, the operation process is cumbersome and inefficient, relying too much on manual experience, which not only takes time and effort but also affects the overall detection progress. Secondly, the knocking vibration is likely to cause the core sample to break or generate internal microcracks, seriously affecting the accuracy of the test data. In addition, this method has high technical requirements for operators. Improper force control may cause the hole wall to collapse or the drill bit to be damaged, increasing the construction risk and potential safety hazards. When encountering areas with dense steel bars or high-strength concrete, the success rate of manual truncation and core sampling will be significantly reduced, and the additional auxiliary tools carried also increase the complexity of on-site operations. Summary of the Invention

[0006] In view of the above problems existing in the prior art, a sampling device for the construction inspection of steel structure concrete in construction projects is proposed.

[0007] On the one hand, the present application provides a sampling device for the construction inspection of steel structure concrete in building engineering, and its purpose is to: after the concrete core drilling sampling machine completes drilling and reaches the target depth, cut off the connection between the core sample and the matrix, and then completely take out the cut core sample from the hole to avoid falling off or breaking.

[0008] The technical solution of the present invention is: a sampling device for the construction inspection of steel structure concrete in building engineering, used to obtain core columns, including a drill cylinder, a connection handle is arranged at the top of the drill cylinder, a lining cylinder is fixedly nested inside the bottom of the drill cylinder, and a plurality of drill teeth are arranged at equal intervals together at the bottom of the lining cylinder and the drill cylinder. A pair of cutting units are symmetrically arranged at the upper center of the lining cylinder;

[0009] The cutting unit includes a chain saw, one end of the chain saw is hinged to the upper end face of the lining cylinder through a connecting rod one, and the other end is hinged with a friction assembly, and the friction assembly slides along the inner wall of the drill cylinder;

[0010] When the drill cylinder rotates forward, the core column does not drive the friction assembly to slide, and the chain saw does not cut the core column; when the drill cylinder rotates in reverse, the core column drives the friction assembly to slide in the opposite direction of the drill cylinder, and the chain saw is tensioned and cuts the core column.

[0011] By adopting the above scheme, by arranging a cutting unit in the core drilling sampling machine and using a pair of structures that automatically tension and truncate the bottom of the core column when the drill cylinder rotates in reverse, the breakage of the core sample caused by vibration is avoided, and the integrity of the core sample is ensured; the integrated design of the cutting unit and the drill cylinder makes the entire sampling process more compact and improves the construction adaptability.

[0012] Further, the friction assembly includes a pair of outer shells, each outer shell is provided with an inclined groove, a friction block is arranged inside the outer shell, a part of the friction block is exposed outside the outer shell, sliding blocks are arranged on two end faces of the friction block corresponding to the inclined groove, the sliding blocks slide in the inclined groove, a through groove is arranged on the side of the friction block close to the chain saw, a spring is arranged in the through groove, one end of the spring abuts against the bottom of the through groove, and the other end is connected to the outer shell through a top block arranged on the outer shell; when the drill cylinder rotates forward, the friction block retracts into the outer shell along the inclined groove.

[0013] By adopting the above scheme, by arranging the friction assembly, when the drill cylinder rotates forward for drilling, the friction block retracts into the outer shell along the inclined groove, and the chain saw remains in a relaxed state, which not only avoids ineffective wear but also ensures that the drilling process is not interfered; when the drill cylinder rotates in reverse, the friction force generated between the friction block and the core column causes it to slide in the opposite direction relative to the drill cylinder, thereby automatically tensioning the chain saw to complete the cutting. At the same time, the self-adjusting characteristic of the friction force makes the cutting force always match the hardness of the core column and prevents overload damage.

[0014] Further, it further includes a grasping component. The grasping component includes a circular ring disposed on the liner and below the chain saw. A pair of symmetric strip-shaped openings are provided on the circular ring wall. Each strip-shaped opening is provided with a deformable arc-shaped piece, and the arc-shaped piece protrudes outward from the circular ring. It further includes a trigger block hinged to the friction component through a second connecting rod. The trigger block slides along the outer wall of the circular ring and presses the arc-shaped piece.

[0015] With the above solution, by setting the grasping component and through the mechanical linkage of the sliding of the friction component, while the chain saw completes the truncation action, the arc-shaped piece is triggered to automatically bend towards the cross-section of the core column, forming a three-point stable grasping structure. It avoids the risk of the sample core falling off in the traditional method, effectively prevents the surface of the core column from being damaged to form a closed grasping system, and solves the problem of breakage caused by the easy shaking and collision of the sample core in the traditional method.

[0016] Further, an installation groove is provided on the side of the trigger block in contact with the circular ring, and an elastic piece is provided in the installation groove. The elastic piece has a tendency to protrude towards the inner side of the circular ring.

[0017] With the above solution, by setting the elastic piece, when the elastic piece contacts the arc-shaped piece, it will push the arc-shaped piece towards the core column direction, causing the arc-shaped piece to fold back towards the core column direction and forming a supporting effect on the cross-section of the core column.

[0018] Further, a friction pattern is provided on the surface of the friction block in contact with the core column, and the friction pattern is made of wear-resistant material.

[0019] With the above solution, through the friction pattern, the friction force between the friction block and the core column is increased. When the drill barrel rotates in reverse, the friction force generated between the friction block and the core column causes it to slide in the opposite direction relative to the drill barrel, thereby automatically tensioning the chain saw.

[0020] Further, a clamping groove is provided inside the circular ring, and a clamping claw is provided on the upper end surface of the liner. The clamping claw is clamped in the clamping groove.

[0021] With the above solution, by setting the clamping groove and the clamping claw, it plays a role in fixing the circular ring.

[0022] Further, the length of the chain saw does not exceed one-third of the inner circumference of the drill barrel.

[0023] With the above solution, by setting the length of the chain saw, when the chain saw is fully tensioned, it is still smaller than the diameter of the drill barrel, increasing the cutting efficiency of the chain saw.

[0024] Further, an arc-shaped groove is provided on the upper end surface of the liner, and the bottom end of the second connecting rod slides in the arc-shaped groove.

[0025] With the above solution, by setting the arc-shaped groove, the sliding trajectory of the trigger block is further restricted.

[0026] Further, it further includes a support frame, on which a crawling rod is arranged, a crawling module is arranged on the crawling rod, a driving motor is arranged on the crawling module, and the main shaft of the driving motor is connected to a connecting handle.

[0027] Adopting the above solution, it plays a role in supporting and driving the drill barrel and is suitable for the sampling construction site.

[0028] The beneficial effects of the present invention:

[0029] 1. By setting a cutting unit in the core drill sampling machine and using a structure that automatically tightens and truncates the bottom of the core column when the drill barrel rotates reversely, the sampling efficiency and reliability can be significantly improved. The main advantages of this design are as follows: First, it realizes the mechanized operation of the truncation process, without manual knocking, which not only avoids the damage of the sample core caused by vibration but also eliminates the uncertainty of manual operation, ensuring the integrity of the sample core; Second, this structure uses the power of the reverse rotation of the drill barrel to complete the truncation without an additional power source, which not only simplifies the equipment structure but also reduces energy consumption; Third, the integrated design of the cutting unit and the drill barrel makes the entire sampling process more compact, especially suitable for operating in narrow spaces, greatly improving the construction adaptability. In addition, compared with the traditional passive knocking method, this active truncation method can better cope with complex working conditions such as high-strength concrete or steel bar interference, significantly improving the sampling success rate.

[0030] 2. The innovative design of the friction assembly brings multiple advantages to the chain saw cutting system of the core drill sampling machine. By cleverly using the change of mechanical properties during the forward and reverse rotation of the drill barrel, the friction assembly realizes automatic cutting control: when the drill barrel rotates forward for drilling, the friction block retracts into the housing along the inclined groove, and the chain saw remains loose, avoiding ineffective wear and ensuring that the drilling process is not interfered; when the drill barrel rotates reversely, the friction force generated between the friction block and the core column makes it slide in the opposite direction relative to the drill barrel, thus automatically tightening the chain saw to complete the cutting. The biggest highlight of this design is that it realizes function switching completely relying on mechanical transmission without an additional power source or an electronic control system, significantly improving the reliability and environmental adaptability of the equipment. At the same time, the self-adjusting characteristic of the friction force makes the cutting force always match the hardness of the core column, ensuring both cutting efficiency and preventing overload damage. This assembly has a compact structure and sensitive response, especially suitable for use in construction sites with large vibrations and limited space.

[0031] 3. The setting of the grasping component realizes the synchronous linkage of core column truncation and grasping, greatly improving the reliability and efficiency of the core drilling sampling operation. Through the mechanical linkage of the sliding friction component, when the chain saw completes the truncation action, the arc-shaped piece is triggered to automatically bend towards the core column truncation surface, forming a stable three-point grasping structure. This design has three significant advantages: First, the grasping action is seamlessly connected with the truncation process, relying entirely on mechanical transmission without manual intervention, which not only avoids the risk of sample core falling off in traditional methods but also shortens the operation time; Second, the elastic deformation design of the arc-shaped piece can adapt to core columns of different diameters, ensuring uniform distribution of the grasping force and effectively preventing damage to the surface of the core column; Most importantly, this component forms a closed grasping system with the drill barrel, and the core column is always radially constrained during the lifting process, completely solving the problem of fracture caused by easy shaking and collision of the sample core in traditional methods. This integrated truncation design not only simplifies the operation process but also significantly improves the sampling success rate under complex conditions, providing higher-quality core column samples for engineering inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a three-dimensional view of the sampling device for construction engineering steel structure concrete construction inspection of the present invention;

[0033] Figure 2 is a three-dimensional view of the drill barrel in the sampling device for construction engineering steel structure concrete construction inspection of the present invention;

[0034] Figure 3 is of the present invention Figure 2 is a cross-sectional view taken along A-A;

[0035] Figure 4 is of the present invention Figure 2 is a partial truncated view of the cross-sectional view taken along B-B;

[0036] Figure 5 is a three-dimensional view of the internal structure of the drill barrel in the sampling device for construction engineering steel structure concrete construction inspection of the present invention;

[0037] Figure 6 is a three-dimensional view of the ring in the sampling device for construction engineering steel structure concrete construction inspection of the present invention;

[0038] Figure 7 is a three-dimensional view of the friction component in the sampling device for construction engineering steel structure concrete construction inspection of the present invention;

[0039] Figure 8 is an exploded view of the friction component in the sampling device for construction engineering steel structure concrete construction inspection of the present invention;

[0040] Figure 9 is of the present invention Figure 8 front view;

[0041] Figure 10 for the present invention Figure 9 Cross-sectional view at C-C of the present invention

[0042] In the figure:

[0043] 1. Drill tube; 2. Connecting handle; 3. Liner tube; 4. Drill teeth; 5. Chain saw; 6. First connecting rod; 7. Outer housing; 8. Tapered groove; 9. Friction block; 10. Sliding block; 11. Through groove; 12. Spring; 13. Top block; 14. Ring; 15. Strip-shaped opening; 16. Arc-shaped piece; 17. Second connecting rod; 18. Trigger block; 19. Installation groove; 20. Elastic piece; 21. Friction lines; 22. Card slot; 23. Claw; 24. Arc groove; 25. Support frame; 26. Crawling rod; 27. Crawling module; 28. Driving motor Specific embodiments

[0044] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be given with reference to the accompanying drawings of the specification

[0045] Example, referring to Figure 1-10 , a sampling device for the construction and inspection of steel structure concrete in construction engineering is provided for obtaining a core column, including a drill tube 1, a connecting handle 2 is arranged at the top of the drill tube 1, a liner tube 3 is fixedly nested inside the bottom of the drill tube 1, and a plurality of drill teeth 4 are arranged at equal intervals at the bottom of the liner tube 3 and the drill tube 1 together. A pair of cutting units are symmetrically arranged at the upper center of the liner tube 3; the cutting unit includes a chain saw 5, one end of the chain saw 5 is hinged to the upper end face of the liner tube 3 through a first connecting rod 6, and the other end is hinged with a friction assembly, and the friction assembly slides along the inner wall of the drill tube 1; when the drill tube 1 rotates forward, the core column does not drive the friction assembly to slide, and the chain saw 5 does not cut the core column; when the drill tube 1 rotates reversely, the core column drives the friction assembly to slide in the opposite direction of the drill tube 1, and the chain saw 5 is tensioned and cuts the core column

[0046] In this embodiment, the chain saw 5 is composed of a plurality of chain links, and each chain link is provided with a hook tooth, and the hook tooth is opposite to the forward rotation direction of the drill tube 1. When the drill tube 1 rotates reversely, the two symmetrical chain saws 5 approach the center of the core column while rotating, playing a role in cutting the core column; the bottom surface of the drill tube 1 is flush with the bottom surface of the liner tube 3, and the thickness of the drill teeth 4 is the same as the sum of the thicknesses of the drill tube 1 and the liner tube 3

[0047] By arranging a cutting unit in the core drilling sampling machine and using a structure that automatically tensions and truncates the bottom of the core column when the drill tube 1 rotates reversely, the breakage of the sample core caused by vibration is avoided, ensuring the integrity of the sample core; the integrated design of the cutting unit and the drill tube 1 makes the entire sampling process more compact and improves the construction adaptability

[0048] Referring to Figures 7-10, the friction assembly includes a pair of outer shells 7. Each outer shell 7 is provided with an inclined groove 8. A friction block 9 is arranged inside the outer shell 7. Part of the friction block 9 is exposed outside the outer shell 7. Sliding blocks 10 are arranged on two end faces of the friction block 9 corresponding to the inclined groove 8. The sliding blocks 10 slide in the inclined groove 8. A through groove 11 is formed on one side of the friction block 9 close to the chain saw 5. A spring 12 is arranged in the through groove 11. One end of the spring 12 abuts against the bottom of the through groove 11, and the other end is connected to the outer shell 7 through a top block 13 arranged on the outer shell 7; when the drill cylinder 1 rotates forward, the friction block 9 retracts into the outer shell 7 along the inclined groove 8.

[0049] In this embodiment, the outer shell 7 has a vertically symmetrical structure. An opening for the friction block 9 to protrude is formed on the outer shell 7. When the drill cylinder 1 rotates forward, the friction block 9 retracts into the outer shell along the inclined groove 8. The pressure between the friction block 9 and the core column decreases, and the friction force between the friction block 9 and the core column decreases. When the drill cylinder 1 rotates in reverse, the friction block 9 extends out of the outer shell along the inclined groove 8. The pressure between the friction block 9 and the core column increases, and the friction force between the friction block 9 and the core column increases. The friction block 9 rotates in the opposite direction to the rotation direction of the drilling hole, playing a role in tensioning the chain saw 5.

[0050] By setting the friction assembly, when the drill cylinder 1 rotates forward for drilling, the friction block 9 retracts into the outer shell 7 along the inclined groove 8, and the chain saw 5 remains in a relaxed state, which not only avoids ineffective wear but also ensures that the drilling process is not disturbed; when the drill cylinder 1 rotates in reverse, the friction force generated between the friction block 9 and the core column causes it to slide in the opposite direction relative to the drill cylinder 1, thereby automatically tensioning the chain saw 5 to complete cutting. At the same time, the self-adjusting characteristic of the friction force makes the cutting force always match the hardness of the core column and prevents overload damage.

[0051] Referring to Figures 4-6 , it further includes a grasping assembly. The grasping assembly includes a ring 14 arranged on the lining cylinder 3 and below the chain saw 5. A pair of symmetric strip-shaped openings 15 are arranged on the wall of the ring 14. A deformable arc-shaped piece 16 is arranged in each strip-shaped opening 15. The arc-shaped piece 16 protrudes towards the outside of the ring 14. It further includes a trigger block 18 hinged to the friction assembly through a connecting rod two 17. The trigger block 18 slides along the outer wall of the ring 14 and presses the arc-shaped piece 16.

[0052] In this embodiment, the length of the arc-shaped piece 16 is greater than the length of the strip-shaped opening 15. Therefore, the arc-shaped piece 16 has two states: protruding towards the outside of the ring 14 and protruding towards the inside of the arc-shaped piece 16. When the arc-shaped piece 16 protrudes towards the outside of the ring 14, the arc-shaped piece 16 closely adheres to the inner wall of the drill cylinder 1 and does not contact the core column. When the arc-shaped piece 16 is pressed and protrudes towards the inside of the ring 14, the arc-shaped piece 16 will form a support on the cross-section of the core column and clamp the core column in the drill cylinder 1 and pull it out with the drill cylinder 1.

[0053] By setting up the grasping component and through the mechanical linkage of the friction component sliding, when the chain saw 5 completes the cutting action, it triggers the arc-shaped piece 16 to automatically bend towards the core column cut surface, forming a three-point stable grasping structure. This avoids the risk of the sample core falling off in the traditional method, effectively prevents the surface of the core column from being damaged to form a closed grasping system, and solves the problem of fracture caused by the easy shaking and collision of the sample core in the traditional method.

[0054] Refer to Figure 10 , on the side where the trigger block 18 contacts the ring 14, there is an installation groove 19. Inside the installation groove 19, there is an elastic piece 20. At both ends of the elastic piece 20, there are compressed elastic structures, making the elastic piece 20 have a tendency to protrude towards the inner side of the ring 14. The position of the elastic piece 20 matches that of the arc-shaped piece 16, and its width is smaller than the strip-shaped opening 15, and it can pass through the strip-shaped opening 15.

[0055] By setting up the elastic piece 20, when the elastic piece 20 contacts the arc-shaped piece 16, it will push the arc-shaped piece 16 towards the core column direction, causing the arc-shaped piece 16 to fold back towards the core column direction and forming a supporting effect on the core column cut surface.

[0056] Refer to Figure 8 , on the surface of the friction block 9 that contacts the core column, there are friction lines 21, and the friction lines 21 are made of wear-resistant materials.

[0057] Through the friction lines 21, the friction force between the friction block 9 and the core column is increased. When the drill cylinder 1 rotates in reverse, the friction force generated between the friction block 9 and the core column causes it to slide in the opposite direction relative to the drill cylinder 1, thereby automatically tensioning the chain saw 5.

[0058] Refer to Figures 5-6 , inside the ring 14, there is a card slot 22, and on the upper end surface of the lining cylinder 3, there are clamping claws 23, and the clamping claws 23 are clamped in the card slot 22.

[0059] By setting up the card slot 22 and the clamping claws 23, it plays a role in fixing the ring 14.

[0060] Refer to Figure 3 , the length of the chain saw 5 does not exceed one-third of the inner circumference of the drill cylinder 1.

[0061] By setting the length of the chain saw 5, when the chain saw 5 is fully tensioned, it is still smaller than the diameter of the drill cylinder 1, increasing the cutting efficiency of the chain saw 5.

[0062] Refer to Figure 5 , on the upper end surface of the lining cylinder 3, there is an arc groove 24, and the bottom end of the connecting rod two 17 slides in the arc groove 24.

[0063] By setting up the arc groove 24, the sliding trajectory of the trigger block 18 is further restricted.

[0064] Refer to Figure 1, further comprising a support frame 25, a crawling rod 26 is arranged on the support frame 25, a crawling module 27 is arranged on the crawling rod 26, a driving motor 28 is arranged on the crawling module 27, and the main shaft of the driving motor 28 is connected to the connecting handle 2. It plays a role in supporting and driving the drill cylinder 1 and is suitable for the sampling construction site.

[0065] The working principle of the present invention:

[0066] During the use process, the support frame 25 is fixed on the construction surface, the driving motor 28 is started to make the driving motor 28 rotate forward and make the crawling module 27 slowly approach the construction surface. When the drill cylinder 1 drills into the concrete, when the drill cylinder 1 rotates forward to drill, the friction block 9 is retracted into the outer shell 7 along the inclined groove 8 under the friction force of the core column. At this time, the spring 12 is in a compressed state, and the chain saw 5 remains in a relaxed state. When the predetermined coring depth is reached, the driving motor 28 is reversed. When the drill cylinder 1 rotates in reverse, the friction force generated between the friction block 9 and the core column causes it to slide in the opposite direction relative to the drill cylinder 1. The friction block 9 is extended out of the outer shell 7 along the inclined groove 8 under the friction force of the core column. The friction force between the friction block 9 and the core column increases, and the friction block 9 drives one end of the chain saw 5 to slide and tighten, so that the chain saw 5 cuts the bottom of the core column. When the chain saw 5 completes the truncation action, the trigger block 18 continuously slides towards the arc-shaped piece 16, and the elastic piece 20 pops out of the installation groove 19 and presses the arc-shaped piece 16, triggering the arc-shaped piece 16 to automatically bend towards the core column cross-section, forming a three-point stable grasping structure. Operate the crawling module 27 to move upward, lift the drill cylinder 1 out of the drill hole, and press the arc-shaped piece 16 away from the core column to take out the core column.

[0067] Comparative experiment between the present invention and the traditional core sampling machine:

[0068] 1. Experimental design:

[0069] Specimen parameters: Concrete strength grade: C30 / C50 (comparing different strengths); Steel bar configuration: Φ10mm@150mm bidirectional grid; Sampling diameter: 100mm; Sampling depth: 300mm; Ambient temperature: 25±2 .

[0070] Equipment parameters:

[0071]

[0072] 2. Comparison of experimental data:

[0073] Test items: Operating efficiency (time for completing a single sampling); Sampling success rate (completely taking out an undamaged sample); Sample quality (end face flatness / integrity score); Manpower consumption (evaluation of operator fatigue).

[0074] Experimental results:

[0075]

[0076] ( Fatigue assessment criteria: Subjective fatigue feeling after 10 consecutive operations).

[0077] 3. Comparison of typical working conditions:

[0078]

[0079] 4. Verification of key improvements:

[0080] Cutting force test: The new model chain saw can provide a continuous cutting force of ≥3.5 kN (meeting the requirements of C60 concrete);

[0081] Grasping force test: The grasping mechanism provides a uniform lifting force of ≥10 kN axially (no indentation or fragmentation of the sample);

[0082] Durability test: After continuous operation for 8 hours, the wear of the key components of the new model is <0.1 mm.

[0083] 5. Conclusion:

[0084] The new automatic cutting and grasping model has significant advantages in the following aspects:

[0085] Efficiency improvement: The operation time is shortened by 67%-75%;

[0086] Quality assurance: The flatness of the end face is increased by more than 60%;

[0087] Strong universality: It still maintains a success rate of >90% in high-strength (C50) concrete.

[0088] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A sampling device for construction engineering steel structure concrete construction inspection, including a drill cylinder (1), and a connecting handle (2) is arranged at the top of the drill cylinder (1), and it is characterized in that: A lining cylinder (3) is fixedly nested inside the bottom of the drill cylinder (1). A plurality of drill teeth (4) are equally spaced and arranged together at the bottom of the lining cylinder (3) and the drill cylinder (1). A pair of cutting units are symmetrically arranged at the center of the upper part of the lining cylinder (3); The cutting unit includes a chain saw (5). One end of the chain saw (5) is hinged to the upper end face of the lining cylinder (3) through a first connecting rod (6), and the other end is hinged with a friction assembly. The friction assembly slides along the inner wall of the drill cylinder (1); When the drill cylinder (1) rotates forward, the core column does not drive the friction assembly to slide, and the chain saw (5) does not cut the core column; when the drill cylinder (1) rotates reversely, the core column drives the friction assembly to slide in the opposite direction of the drill cylinder (1), and the chain saw (5) is tensioned and cuts the core column; The friction assembly includes a pair of outer shells (7). Each outer shell (7) is provided with an inclined groove (8). A friction block (9) is arranged inside the outer shell (7). The friction block (9) partially protrudes from the outer shell (7). Sliding blocks (10) are arranged on two end faces of the friction block (9) corresponding to the inclined groove (8). The sliding blocks (10) slide in the inclined groove (8). A through groove (11) is formed on the side of the friction block (9) close to the chain saw (5). A spring (12) is arranged in the through groove (11). One end of the spring (12) abuts against the bottom of the through groove (11), and the other end is connected to the outer shell (7) through a top block (13) arranged on the outer shell (7); when the drill cylinder (1) rotates forward, the friction block (9) retracts into the outer shell (7) along the inclined groove (8).

2. The sampling device for construction engineering steel structure concrete construction inspection according to claim 1, characterized in that: It further includes a grasping assembly. The grasping assembly includes a ring (14) arranged on the upper part of the lining cylinder (3) and below the chain saw (5). A pair of symmetrical strip-shaped openings (15) are arranged on the wall of the ring (14). A deformable arc-shaped piece (16) is arranged in each strip-shaped opening (15). The arc-shaped piece (16) protrudes towards the outside of the ring (14). It also includes a trigger block (18) hinged to the friction assembly through a second connecting rod (17). The trigger block (18) slides along the outer wall of the ring (14) and presses the arc-shaped piece (16).

3. The sampling device for construction engineering steel structure concrete construction inspection according to claim 2, characterized in that: An installation groove (19) is arranged on the side of the trigger block (18) in contact with the ring (14). An elastic piece (20) is arranged in the installation groove (19). The elastic piece (20) has a tendency to protrude towards the inside of the ring (14).

4. The sampling device for construction engineering steel structure concrete construction inspection according to claim 1, characterized in that: A friction pattern (21) is arranged on the surface of the friction block (9) in contact with the core column. The friction pattern (21) is made of wear-resistant material.

5. The sampling device for construction engineering steel structure concrete construction inspection according to claim 2, characterized in that: A clamping groove (22) is arranged inside the ring (14). A claw (23) is arranged on the upper end face of the lining cylinder (3). The claw (23) is clamped in the clamping groove (22).

6. The sampling device for construction engineering steel structure concrete construction inspection according to claim 1, characterized in that: The length of the chain saw (5) does not exceed one-third of the inner circumference of the drill cylinder (1).

7. The sampling device for construction engineering steel structure concrete construction inspection according to claim 1, characterized in that: An arc groove (24) is arranged on the upper end face of the lining cylinder (3). The bottom end of the second connecting rod (17) slides in the arc groove (24).

8. The sampling device for construction engineering steel structure concrete construction inspection according to claim 1, characterized in that: It includes a support frame (25). A crawling rod (26) is arranged on the support frame (25). A crawling module (27) is arranged on the crawling rod (26). A driving motor (28) is arranged on the crawling module (27). The main shaft of the driving motor (28) is connected to the connecting handle (2).

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