Special bottom expanding tool for rear bottom expanding anchor bolt

Abstract

The utility model discloses a special underreaming tool for a rear underreaming anchor bolt, which comprises a power rod, a limit sleeve, a positioning sleeve, a guide sleeve and an underreaming blade, a transmission wedge sleeve is arranged on the power rod, the limit sleeve is sleeved on the outer side of the power rod, and the upper end of the positioning sleeve is inserted into the limit sleeve and is clamped with the transmission wedge sleeve in a sliding manner; the power rod drives the positioning sleeve to rotate synchronously through the transmission wedge sleeve and can move up and down relative to the positioning sleeve. The upper end of the positioning sleeve is fixedly connected with the limiting sleeve, and the lower end is fixedly connected with the guide sleeve; the broaching blade is arranged in the guide sleeve, and a long slotted hole for the broaching blade to extend out is formed in the circumference of the guide sleeve; the bottom end of the power rod penetrates through the positioning sleeve to abut against the top of the reaming blade. The power rod is used for opening the reaming blade at the bottom and driving the reaming blade to rotate, so that the reaming blade cuts the bottom wall of a hole, reaming operation is rapidly and accurately completed, and installation efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, and in particular to a special tool for expanding the bottom of a rear-expanded anchor bolt. Background Technology

[0002] Undercut anchoring systems are widely used in construction and engineering for securing work. During installation, the anchor bolt positions are first determined according to the design, holes are drilled, and then the bolts are inserted and secured. This requires precise measurements and specialized tools. Undercut anchoring systems offer significant advantages: strong securing force, high stability, ability to withstand large loads, long service life, and corrosion resistance. However, their installation is complex and requires specialized knowledge and skills. Installation failure can have serious consequences; loose or failed anchor bolts can compromise structural stability, significantly increasing the risk of safety accidents. Furthermore, repairing and replacing anchor bolts is time-consuming, costly, and may delay project progress.

[0003] Therefore, ensuring the correct installation of the bottom-cutting anchoring system is of great significance. Professional installation and regular inspections should be ensured to maintain the system's safety and stability. Utility Model Content

[0004] To address the aforementioned issues, this invention provides a special tool for expanding the bottom of post-expanded anchor bolts. This tool can pre-expand the mounting hole when the substrate has high hardness, facilitating subsequent bottom-cutting and anchoring operations.

[0005] Therefore, the technical solution of this utility model is: a special bottom-expanding tool for rear-expanding anchor bolts, including a power rod, a limiting sleeve, a positioning sleeve, a guide sleeve, and an expanding blade. The power rod is provided with a transmission wedge sleeve, and the limiting sleeve is fitted on the outer side of the power rod. The upper end of the positioning sleeve is inserted into the limiting sleeve and slidably engaged with the transmission wedge sleeve. The power rod drives the positioning sleeve to rotate synchronously through the transmission wedge sleeve and can move up and down relative to the positioning sleeve. The upper end of the positioning sleeve is fixedly connected to the limiting sleeve, and the lower end is fixedly connected to the guide sleeve. The expanding blade is placed in the guide sleeve, and the circumference of the guide sleeve is provided with a long slot for the expanding blade to extend. The bottom end of the power rod passes through the positioning sleeve and abuts against the top of the expanding blade.

[0006] Based on the above scheme and as a preferred embodiment of the above scheme: the hole-enlarging blade is composed of multiple blade units, each blade unit including a blade block and a guide blade, the upper ends of the multiple blade blocks are assembled into a guide groove, and the bottom end of the power rod abuts against the guide groove.

[0007] Based on the above scheme and as a preferred embodiment of the above scheme: the bottom of the guide sleeve is provided with a limiting block and a second spring. The limiting block is provided with a slot for the guide blade to be inserted. The slot is opposite to the long slot hole of the guide sleeve. The second spring abuts against the bottom of the guide sleeve and the limiting block respectively.

[0008] Based on the above scheme and as a preferred embodiment of the above scheme: tungsten steel is welded to the tip of the reaming blade.

[0009] Based on the above scheme and as a preferred embodiment of the above scheme: a first spring is fitted on the power rod, and the first spring abuts against the bottom end of the positioning sleeve and the transmission wedge sleeve respectively.

[0010] Based on the above scheme and as a preferred embodiment of the above scheme: a bearing and a washer are provided between the first spring and the transmission wedge sleeve.

[0011] Based on the above scheme and as a preferred embodiment of the above scheme: a groove is provided on the upper circumference of the positioning sleeve, and multiple sliders are provided around the transmission wedge sleeve of the power rod, with the sliders placed in the groove; the power rod drives the positioning sleeve to rotate through the sliders and can move up and down relative to the groove.

[0012] Based on the above scheme and as a preferred embodiment of the above scheme: the upper end of the positioning sleeve is inserted into the bottom of the limiting sleeve, and the two are fixedly connected by bolts; the lower end of the positioning sleeve is fixedly connected to the upper end of the guide sleeve by threads.

[0013] Based on the above scheme and as a preferred embodiment of the above scheme: the positioning sleeve is filled with lubricating oil, and the bottom end of the power rod is rounded and coated with lubricating oil.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. The reaming blade at the bottom is opened by a power rod and rotated, allowing it to cut the bottom wall of the hole, completing the reaming operation quickly and accurately, greatly improving installation efficiency; tungsten steel is welded to the tip of the reaming blade, enabling it to work smoothly in environments with relatively hard substrates, showing strong adaptability; it can effectively improve the anchoring effect by increasing the contact area between the anchor bolt and the hole wall through hole enlargement, thereby enhancing the anchoring force of the anchor bolt.

[0016] 2. Using underreaming tools can enhance structural safety. The increased anchoring force makes the structure more stable when subjected to external forces, reducing the risk of safety accidents. At the same time, it reduces maintenance costs, as the good anchoring effect reduces the repair and replacement costs caused by loose or failed anchor bolts. Furthermore, it improves project quality, ensuring the accuracy and precision of drilling, and providing a strong guarantee for the quality of the entire anchoring project.

[0017] 3. The transmission wedge sleeve on the transmission rod can continuously drive the guide sleeve and positioning sleeve to rotate stably. The first spring can also absorb and release kinetic energy to the maximum extent, so as to achieve vertical and stable downward pushing work. The limiting block in the guide sleeve can limit the swing of the reaming blade. The power rod moves downward along the groove in the blade block, so that the guide blade can stably open and enlarge the hole, and can effectively control the size of the enlarged hole. The second spring and limiting block at the bottom of the guide sleeve can make the overall structure of the reaming tool more stable, and can allow the guide blade to rebound after the reaming work, avoiding situations such as jamming. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a cross-sectional view of the structure of this utility model;

[0020] Figure 3 This is an exploded view of the parts of this utility model;

[0021] Figure 4 This is a structural schematic diagram of the present invention (hidden limiting sleeve);

[0022] Figure 5 This is a schematic diagram of the internal structure of the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of the power rod of this utility model;

[0024] Figure 7 This is a schematic diagram of the structure of the hole-reducing blade of this utility model.

[0025] The components in the diagram are labeled as follows: 1. Power rod; 11. Transmission wedge sleeve; 12. Slider; 13. First spring; 14. Bearing; 15. Washer; 2. Limiting sleeve; 21. Dust plug; 3. Positioning sleeve; 31. Slide groove; 32. Step ring; 4. Guide sleeve; 41. Long slot hole; 5. Hole enlarging blade; 51. Blade block; 52. Guide blade; 53. Guide groove; 6. Bolt; 7. Limiting block; 71. Slot; 8. Second spring. Detailed Implementation

[0026] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0028] See the attached diagram. The rear-expanding anchor bolt special reaming tool described in this embodiment includes a power rod 1, a limiting sleeve 2, a positioning sleeve 3, a guide sleeve 4, and a reaming blade 5. The power rod 1 is equipped with a transmission wedge sleeve 11, and multiple sliders 12 are provided around the transmission wedge sleeve 11. The limiting sleeve 2 is fitted on the outer side of the power rod 1, and the upper end of the positioning sleeve 3 is inserted into the limiting sleeve 2; the two are fixedly connected by bolts 6. A groove 31 is formed on the upper circumferential surface of the positioning sleeve 3, and the sliders 12 are placed in the groove 31. The power rod 1 drives the positioning sleeve 3 to rotate synchronously through the sliders 12 and can move up and down relative to the groove 31. The limiting sleeve 2 has a through hole for the power rod 1 to pass through, and a dust plug 21 is provided at the through hole to maximize the protection of the internal structure of the limiting sleeve and greatly increase the overall lifespan of the reaming tool.

[0029] A first spring 13 is fitted onto the power rod 1. The upper end of the first spring 13 abuts against the transmission wedge sleeve 11 of the power rod 1 via a bearing 14 and a washer 15. The bottom end of the positioning sleeve 3 is provided with a stepped ring 32, and the lower end of the first spring 13 abuts against the stepped ring 32 via a washer. When the power rod 1 moves downward, it will compress the first spring 13. After drilling is completed, the first spring 13 can drive the power rod 1 to return to its original position. The contact surfaces of the transmission wedge sleeve 11, washer, bearing, and first spring are filled with grease to reduce friction and wear during operation and lower the temperature.

[0030] The lower end of the positioning sleeve 3 is fixed to the guide sleeve 4 by a threaded connection. The reaming blade 5 is placed inside the guide sleeve 4, and the guide sleeve 4 has a long slot 41 on its circumference for the reaming blade 5 to extend out. The reaming blade 5 is composed of four blade units, each including a blade body block 51 and a guide blade 52. The upper ends of the four blade body blocks 51 are assembled into a guide groove 53. The bottom end of the power rod 1 passes through the positioning sleeve 3 and abuts against the guide groove 53 at the top of the reaming blade 5. With the downward movement of the power rod 1, the guide blade 52 is gradually opened. The guide blade 52 has a sheet-like structure and can extend out from the long slot 41 of the guide sleeve 4 when opened. The tip of the guide blade is welded with a tungsten steel blade to improve the service life of the blade and enable it to complete the reaming operation even on high-hardness substrates.

[0031] The bottom of the guide sleeve 4 is provided with a limiting block 7 and a second spring 8. The limiting block 7 has a slot 71 for the guide blade 52 to be inserted. The slot 71 is positioned opposite to the elongated slot 41 of the guide sleeve 4. The second spring 8 rests against the bottom of the guide sleeve 4 and the limiting block 7. When the power rod 1 rotates downward, it moves downward to push the blade block 51 to open outward and push the guide blade 52 through the slot 71 and the elongated slot 41 to cut and enlarge the hole outward. After the enlargement is completed, the second spring 8 below the limiting block 7 releases the absorbed power and reverses to reset the guide blade 52. The contact surface between the limiting block 7 and the guide sleeve 4 should be filled with grease to reduce friction and wear during operation and lower the temperature.

[0032] The positioning sleeve 3 is filled with grease, which reduces wear and temperature during hole enlargement, greatly increasing the tool's service life. The bottom of the power rod 1 is rounded and coated with grease. The rounded design, combined with the grease coating, significantly reduces tool wear during operation and improves stability.

[0033] When using:

[0034] 1) Drill holes in the substrate in advance, and put the hole reaming tool into the drilled holes. At this time, the hole reaming blade 5 is retracted inside the guide sleeve 4 and will not interfere with the placement of the hole reaming tool.

[0035] 2) Connect the power rod 1 to the electric hammer and start the electric hammer. The electric hammer, as the power source, starts to drive the power rod 1 to rotate. The slider 12 on the transmission wedge sleeve 11 of the power rod 1 is placed in the groove 31 of the positioning sleeve 3, so that the power rod 1 can drive the positioning sleeve 3 to rotate synchronously. At the same time, the positioning sleeve 3 and the limiting sleeve 2 are fixed by bolts 6, and the positioning sleeve 3 and the guide sleeve 4 are fixedly connected by threads. Therefore, the power rod 1, the positioning sleeve 3, the limiting sleeve 2, and the guide sleeve 4 rotate synchronously.

[0036] 3) When the electric hammer moves downward, the power rod 1 can be pushed downward, the slider 12 on the transmission wedge sleeve 11 moves along the slide groove 31, and the transmission wedge sleeve 11 compresses the first spring 13 downward through the washer 14 and the bearing 15, and the first spring 13 stores power.

[0037] 4) When the power rod 1 is pushed down, the round head of the power rod 1 pushes the cutter block 51 outward along the guide groove 53 at the top of the reaming cutter 5. The outward expansion of the cutter block 51 causes the guide cutter 52 to cut the reaming hole outward. At the same time, the limiting block 7 compresses the second spring 8 downward, and the second spring 8 stores power.

[0038] 5) When the hole reaming operation is completed, the second spring 8 releases its power to push the limiting block 7 upward, and the limiting block 7 pushes the cutter block 51 upward, causing the reaming cutter 5 to return to its original position;

[0039] 6) The first spring 13 releases its power, causing the power rod 1 to move upward and reset, thus completing the hole enlargement work.

[0040] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A special tool for expanding the base of a post-expanded anchor bolt, characterized in that: The device includes a power rod, a limiting sleeve, a positioning sleeve, a guide sleeve, and a reaming blade. The power rod is equipped with a transmission wedge sleeve, and the limiting sleeve is fitted on the outer side of the power rod. The upper end of the positioning sleeve is inserted into the limiting sleeve and slidably engaged with the transmission wedge sleeve. The power rod drives the positioning sleeve to rotate synchronously through the transmission wedge sleeve and can move up and down relative to the positioning sleeve. The upper end of the positioning sleeve is fixedly connected to the limiting sleeve, and the lower end is fixedly connected to the guide sleeve. The reaming blade is placed inside the guide sleeve, and the circumference of the guide sleeve is provided with a long slot for the reaming blade to extend. The bottom end of the power rod passes through the positioning sleeve and abuts against the top of the reaming blade.

2. The special enlarging tool for post-enlarged anchor bolts as described in claim 1, characterized in that: The enlarging blade is composed of multiple blade units, each blade unit including a blade body block and a guide blade. The upper ends of the multiple blade body blocks are assembled into a guide groove, and the bottom end of the power rod abuts against the guide groove.

3. The special enlarging tool for post-enlarged anchor bolts as described in claim 2, characterized in that: The bottom of the guide sleeve is provided with a limiting block and a second spring. The limiting block is provided with a slot for the guide blade to be inserted. The slot is opposite to the long slot hole of the guide sleeve. The second spring abuts against the bottom of the guide sleeve and the limiting block respectively.

4. The special enlarging tool for post-enlarged anchor bolts as described in claim 2, characterized in that: The tip of the reaming blade is welded with tungsten steel.

5. The special enlarging tool for post-enlarged anchor bolts as described in claim 1, characterized in that: A first spring is fitted onto the power rod, and the first spring abuts against the bottom end of the positioning sleeve and the transmission wedge sleeve respectively.

6. The special enlarging tool for post-enlarged anchor bolts as described in claim 5, characterized in that: A bearing and a washer are provided between the first spring and the transmission wedge sleeve.

7. The special enlarging tool for post-enlarged anchor bolts as described in claim 1, characterized in that: The positioning sleeve has a groove on its upper circumference, and the power rod has multiple sliders on its outer periphery, which are placed in the groove. The power rod drives the positioning sleeve to rotate through the sliders and can move up and down relative to the groove.

8. The special enlarging tool for post-enlarged anchor bolts as described in claim 1, characterized in that: The upper end of the positioning sleeve is inserted into the bottom of the limiting sleeve, and the two are fixedly connected by bolts; the lower end of the positioning sleeve is fixedly connected to the upper end of the guide sleeve by threads.

9. A special enlarging tool for post-enlarged anchor bolts as described in claim 1, characterized in that: The positioning sleeve is filled with lubricating oil, and the bottom end of the power rod is rounded and coated with lubricating oil.

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