Reamer bit and concrete repairing method

Abstract

The invention relates to the field of constructional engineering concrete detection, in particular to a reamer bit and a concrete repairing method.The reamer bit comprises a mounting base, at least two drill arms and at least two supporting rods; one end of the drill arm is hinged with the mounting seat, a fixing pipe is arranged between the hinge points of the drill arm and the mounting seat, the fixing pipe is connected with a positioning rod in a sliding manner, one end of the supporting rod is hinged with the positioning rod, and the other end of the supporting rod is hinged with the drill arm. When the reamer bit is used, the angle of the drill arm can be flexibly adjusted by pressing the positioning rod, the hole diameter of a reaming hole can be accurately controlled according to actual repairing requirements, and the reamer bit is suitable for repairing scenes of coring holes of different sizes and depths; the formed horn mouth with the wide inside and the narrow outside can be embedded into original concrete like a tenon after concrete is poured, the combining capacity of new concrete and old concrete is greatly improved, and it is guaranteed that a repaired area is not prone to separation.

Description

Technical Field

[0001] The invention relates to the field of construction engineering concrete detection, and in particular to a hole expansion drill bit and a concrete repair method. Background Art

[0002] In construction projects, the quality of concrete entities is undoubtedly a key factor in measuring the quality of the project, among which the concrete strength index occupies a vital position. When there are doubts about the quality of concrete entities, the core sampling method is widely used in actual operations as a direct and effective detection method. The core sampling method is a local micro-damage on-site detection method that uses a concrete core drill to drill cylindrical concrete core samples directly from the structure or component, and then conducts a compression test after processing according to relevant specifications. The strength of the concrete of the structure or component is inferred based on the compressive strength of the core sample.

[0003] However, it must be pointed out that the core drilling method will cause a certain degree of damage to the concrete structure during implementation. For the cylindrical voids produced after detection, most construction units often adopt the method of randomly pouring concrete for repair. This practice will inevitably have a negative impact on the overall performance, impermeability and durability of the concrete structure.

[0004] Especially in tunnel projects, for the structural part above the secondary lining arch waist, since the tunnel is in a vibrating environment for a long time, the concrete filled by the above-mentioned repair method is very easy to fall off and drop off, which not only threatens the stability of the tunnel structure, but more seriously, it directly affects driving safety and poses a potential risk to the safety of people's lives and property. Therefore, it is urgent to seek a more scientific and reasonable solution to this problem to ensure the integrity and safety of the concrete structure. Summary of the invention

[0005] The purpose of the present invention is to overcome the disadvantage that when a concrete entity is tested by a conventional core sampling method, the cylindrical voids produced after the test are often directly repaired by pouring concrete, which is very prone to falling off, falling pieces, etc., and there are great safety hazards. A hole expansion drill bit and a concrete repair method are provided.

[0006] In a first aspect, the present invention provides a reaming drill bit, comprising a mounting seat, at least two drill arms and at least two support rods; one end of the drill arm is hinged to the mounting seat, a fixed tube is arranged between the hinge point of the drill arm and the mounting seat, the fixed tube is slidably connected to a positioning rod, one end of the support rod is hinged to the positioning rod, and the other end of the support rod is hinged to the drill arm.

[0007] The reaming drill bit provided by the present invention has a simple structure and is easy to operate. The positioning rod is slidably connected to the fixed tube, and the fixed tube is fixedly connected to the mounting seat, so that the positioning rod can move under the guidance of the fixed tube; the drill arm is hinged with the mounting seat and the support rod, and the support rod is hinged with the positioning rod, so that when the positioning rod moves along the fixed tube, for example, the positioning rod moves in a direction away from the mounting seat to drive the drill arm to shrink until the drill arm is completely retracted, or the positioning rod moves in the direction of the mounting seat to drive the drill arm to open. In this way, the reaming drill bit can flexibly adjust the drill arm angle by pressing the positioning rod when in use, and can accurately control the size of the reaming aperture according to actual repair needs, so as to adapt to the repair scenes of coring holes of different sizes and depths. A flared mouth with a wide inside and a narrow outside is formed in the cylindrical cavity formed after core sampling. After that, concrete is poured into the coring hole after the reaming, which can be embedded into the original concrete like a tenon, and the original concrete plays the role of a mortise. This mortise and tenon connection increases the bite force between the two, greatly improves the bonding ability of the new and old concrete, and ensures that the repaired area is not easy to separate.

[0008] Preferably, the mounting seat comprises a corer connecting portion and a protective cover connected to the corer connecting portion, the corer connecting portion is used to connect to the corer, at least one end of the drill arm is located in the protective cover, and the drill arm is hinged to the protective cover through a first through shaft.

[0009] The mounting base includes a core drilling machine connection part and a protective cover. The core drilling machine connection part facilitates the quick connection between the reaming drill bit and the core drilling machine. For example, the two can be threaded connections, flange connections or quick connector connections. On the one hand, the protective cover wraps a part of the drill arm inside, effectively preventing external dust, debris and concrete particles from entering the key component area of ​​the drill bit, reducing component failures caused by wear or jamming; on the other hand, the setting of the protective cover can also avoid direct exposure of the high-speed running drill arm, reduce the risk of direct contact between operators and high-speed components, and further improve the safety of equipment use.

[0010] Preferably, the fixed pipe is communicated with the coring machine connection portion, and the fixed pipe is provided with at least one water spray hole.

[0011] During the core drilling process, the high-speed friction between the drill bit and the concrete will generate a lot of heat. By connecting the fixed pipe with the core drilling machine connection part and opening a water spray hole in the fixed pipe, the fixed pipe can also be used as a water spray pipe. Water is sprayed out through the core drilling machine, the core drilling machine connection part, the fixed pipe and the water spray hole. This can effectively reduce the temperature of the drill bit and its surrounding areas, prevent the drill bit from performance degradation or damage due to overheating, protect the cutting edge of the drill bit and extend its service life.

[0012] Preferably, when the positioning rod slides in the direction toward the mounting seat, the drill arm opens symmetrically; when the positioning rod slides in the direction away from the mounting seat, the drill arm contracts symmetrically.

[0013] The drill arm can be opened or retracted by sliding the positioning rod. The operation is intuitive and does not require complicated operating tools or additional power devices, reducing the difficulty of construction. The positioning rod controls the symmetrical opening and retraction of the drill arm, ensuring the synchronization of the drill arm movement, thereby ensuring that the hole shape formed when the drill bit expands the hole is accurate and the inner width and outer narrowness of the bell mouth remain uniform.

[0014] Preferably, the outer wall of the drill arm is an arc-shaped structure.

[0015] The drill arm with an arc structure can effectively reduce the friction resistance of the drill arm when rotating to expand the hole, making the drill bit smoother when drilling or expanding the hole in the concrete, thereby improving construction efficiency.

[0016] Preferably, a plurality of cutting protrusions are provided on the outer wall of the drill arm.

[0017] The cutting protrusions can form multiple cutting points when the drill arm rotates, reducing the resistance of a single cut and increasing the hole expansion speed. The protrusion design can quickly break the concrete surface and improve the hole expansion efficiency, especially in high-strength concrete.

[0018] In a second aspect, the present invention provides a concrete repair method, using the above-mentioned reaming drill bit, comprising the following steps:

[0019] S1: Connect the mounting base to the coring machine, and move the reaming drill until the positioning rod contacts the bottom of the coring hole and stops moving;

[0020] S2: Start the coring machine, continue to move the reaming drill bit toward the bottom of the coring hole, and gradually open the drill arm to cut the coring hole wall, so that the coring hole forms a bell-mouth structure with a bottom diameter larger than the opening diameter of the coring hole;

[0021] S3: remove the reaming drill bit and complete the core hole reaming;

[0022] S4: inserting a trumpet steel cage into the expanded core hole, wherein the trumpet steel cage comprises a columnar portion and a trumpet portion connected to the columnar portion, wherein the diameter of the columnar portion is smaller than the diameter of the core hole, and the trumpet portion matches the trumpet mouth structure formed after the hole is expanded;

[0023] S5: Inject concrete with a strength grade one level higher than the original concrete into the core hole to complete the concrete repair at the core hole.

[0024] The concrete repair method provided by the present invention uses a reaming drill bit to expand the core hole into a trumpet-shaped structure that is wide inside (near the bottom of the hole) and narrow outside (near the hole mouth). The newly poured concrete can be embedded into the original concrete like a tenon, and the original concrete plays the role of a mortise, which greatly improves the bite force between the new and old concretes, forms a mechanical fit, and significantly enhances the bonding strength, avoiding the problem of easy separation or cracking of the new and old concretes due to the flat interface in the traditional method, and ensuring that the repair area is more firm and stable;

[0025] Install the trumpet steel cage into the coring hole after expansion. During installation, you can use cable ties to tie and tighten the trumpet part. When the trumpet part enters the trumpet mouth structure formed after the expansion, cut the cable ties to match the trumpet part with the trumpet mouth structure. The addition of the trumpet steel cage can form a good combination with the newly poured concrete. During the repair process, when the new concrete is poured into the coring hole, a stable connection between the steel cage and the concrete can be formed, which enhances the bonding strength between the steel bars and the concrete, avoids the separation problem between the repaired concrete and the original structure, and improves the tensile, shear and bending properties of the concrete, thereby improving the durability of the repaired area;

[0026] Pouring high-strength concrete (one level higher than the original concrete strength grade), for example, self-leveling micro-expanded fine stone concrete, further enhances the strength and impact resistance of the repair area.

[0027] Preferably, in S2, when the wide diameter of the bell mouth is 2 cm to 3 cm larger than the diameter of the core hole, the coring machine is turned off.

[0028] By stopping the expansion when the wide diameter of the bell mouth is 2 to 3 cm larger than the diameter of the core hole, the expansion degree can be accurately controlled to ensure that the bell mouth structure that meets the design requirements is formed. This precise control avoids excessive cutting or uneven cutting that may be caused by further expansion, and ensures the uniformity and stability of the hole shape during the repair process.

[0029] Preferably, the trumpet steel cage further comprises a water stop strip, which is sleeved on the columnar portion, and the diameter of the water stop strip matches the diameter of the core hole.

[0030] A water stop strip, such as an annular expansion water stop strip, is sleeved on the columnar portion to improve the waterproof performance of the repaired part, effectively prevent water penetration, protect the internal structure from erosion, and enhance the overall stability of the repaired structure.

[0031] Preferably, one end of the horn portion away from the columnar portion is bent outward to form a bent end. In S4, after the horn steel cage is installed in the expanded core hole, the bent end abuts against the core hole wall.

[0032] The outward bent end prevents the other parts of the horn from contacting the core hole wall, providing space for subsequent concrete pouring. During the concrete pouring process, the concrete can fully flow into the space around the steel cage, avoiding the uneven pouring problem caused by the contact between the steel cage and the hole wall, making the horn steel cage and the concrete form a closer combination, thereby improving the structural strength and stability of the concrete repair.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. The reaming drill bit provided by the present invention has a simple structure and is easy to operate. The positioning rod is slidably connected to the fixed tube, which is fixedly connected to the mounting seat, so that the positioning rod can move under the guidance of the fixed tube; the drill arm is hinged to the mounting seat and the support rod, and the support rod is hinged to the positioning rod, so that when the positioning rod moves along the fixed tube, for example, the positioning rod moves in a direction away from the mounting seat to drive the drill arm to retract until the drill arm is completely retracted, or the positioning rod moves in a direction toward the mounting seat to drive the drill arm to open. In this way, the reaming drill bit can flexibly adjust the drill arm angle by pressing the positioning rod when in use, and can accurately control the reaming aperture size according to actual repair needs, so as to adapt to the repair scenarios of coring holes of different sizes and depths;

[0035] 2. The reaming drill bit provided by the present invention can form a wide inner and narrow outer bell mouth in the cylindrical cavity formed after core sampling. When concrete is poured into the expanded core hole, it can be embedded into the original concrete like a tenon, and the original concrete acts as a mortise. This mortise and tenon connection increases the bite force between the two, greatly improves the bonding ability of the new and old concrete, and ensures that the repaired area is not easy to separate.

[0036] 3. The concrete repair method provided by the present invention uses a reaming drill to expand the core hole into a trumpet-shaped structure with a wide inner side (near the bottom of the hole) and a narrow outer side (near the hole mouth). The newly poured concrete can be embedded into the original concrete like a tenon, and the original concrete plays the role of a mortise, which greatly improves the bite force between the new and old concretes, forms a mechanical fit, and significantly enhances the bonding strength, avoiding the problem of easy separation or cracking of the new and old concretes due to the flat interface in the traditional method, ensuring that the repair area is more solid and stable;

[0037] 4. The concrete repair method provided by the present invention is to install a trumpet steel cage into the core hole after the hole is enlarged. During installation, the trumpet part can be tied and tightened with a cable tie. After the trumpet part enters the trumpet mouth structure formed after the hole is enlarged, the cable tie is cut to match the trumpet part with the trumpet mouth structure. The addition of the trumpet steel cage can form a good combination with the newly poured concrete. During the repair process, when the new concrete is injected into the core hole, a stable connection between the steel cage and the concrete can be formed, which enhances the bonding force between the steel bar and the concrete, avoids the separation problem between the repaired concrete and the original structure, and improves the tensile, shear and bending properties of the concrete, thereby improving the durability of the repaired area; pouring high-strength concrete (one level higher than the original concrete strength grade), for example, self-leveling micro-expanding fine stone concrete, further enhances the strength and impact resistance of the repaired area. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a front view of the reaming drill bit;

[0039] Figure 2 It is a side view of the reaming drill bit;

[0040] Figure 3 It is a schematic diagram of the top surface of the reaming drill bit;

[0041] Figure 4 It is a schematic diagram of the bottom surface of the drill arm;

[0042] Figure 5 This is a diagram showing the expansion drill bit in the coring hole;

[0043] Figure 6 This is a schematic diagram of the front of the speaker steel cage;

[0044] Figure 7 This is a schematic diagram of the top surface of the speaker steel cage;

[0045] Figure 8 Schematic diagram of the horn steel cage located in the core hole after hole expansion.

[0046] Markings in the figure:

[0047] 1-mounting seat, 11-coring machine connection part, 12-protective cover, 13-first through-axis, 2-drill arm, 21-cutting protrusion, 22-second through-axis, 3-support rod, 4-fixing pipe, 41-water spray hole, 5-positioning rod, 51-third through-axis, 52-hinge seat, 6-partition, 100-coring machine, 200-trumpet steel cage, 201-columnar part, 202-trumpet part, 2021-bending end, 203-water stop strip, 300-original concrete. DETAILED DESCRIPTION

[0048] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0049] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all based on the expression of the orientation or position relationship shown in the drawings, or are the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0050] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0051] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0052] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0053] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0054] Example 1

[0055] This embodiment provides a hole enlarging drill bit, which is used to enlarge the core hole after the concrete is tested by the core sampling method.

[0056] Specifically, Figure 1 , Figure 2 As shown, the reaming drill bit provided in this embodiment includes a mounting base 1, at least two drill arms 2 and at least two support rods 3;

[0057] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, in this embodiment, the number of drill arms 2 can be two, and correspondingly, the number of support rods 3 in this embodiment can also be two, that is, one drill arm 2 is connected to one support rod 3. Of course, it can be foreseen that one drill arm 2 can also be connected to two support rods 3, that is, four support rods 3 can also be set in this embodiment.

[0058] The outer wall of the drill arm 2 is an arc-shaped structure, and specifically the outer wall of the drill arm 2 can be a semicircular structure. When the two drill arms 2 are opened, they are used to contact and cut the core hole wall; when the two drill arms 2 are fully retracted, they can be closed to form a cylindrical structure, and the inside of the drill arm 2 can be a hollow structure for accommodating internal structures such as positioning rods 5, support rods 3, and fixed pipes 4. The drill arm 2 with an arc structure can effectively reduce the friction resistance of the drill arm 2 when rotating to expand the hole, so that the drill bit can drill or expand the hole in the concrete more smoothly, thereby improving the construction efficiency.

[0059] Furthermore, the outer wall of the drill arm 2 may be provided with a plurality of cutting protrusions 21. In this embodiment, the cutting protrusions 21 may be cutting blades, fine steel teeth, etc. The cutting protrusions 21 may be arranged randomly or in a matrix. The cutting protrusions 21 may be located at Figure 2 The lower half of the drill arm 2 is shown. The cutting protrusion 21 can form multiple cutting points when the drill arm 2 rotates, reducing the single cutting resistance and increasing the hole expansion speed. The design of the cutting protrusion 21 can quickly break the concrete surface and improve the hole expansion efficiency, especially in high-strength concrete.

[0060] The mounting base 1 includes a corer connection portion 11 and a shield 12 connected to the corer connection portion 11. The corer connection portion 11 is used to connect to the corer 100. The corer connection portion 11 facilitates the quick connection between the reamer and the corer 100. For example, the two can be threaded, flanged or quickly connected. Figure 1 As shown, the coring machine connection part 11 can be located on the top of the shield 12.

[0061] At least one end of the drill arm 2 is located in the shield 12. Figure 1 , Figure 2 For example, the upper end of the drill arm 2 can be arranged in the protective cover 12, and the drill arm 2 is hinged to the protective cover 12 through the first through shaft 13, that is, one end of the drill arm 2 is hinged to the mounting seat 1. On the one hand, the protective cover 12 wraps a part of the drill arm 2 inside, effectively preventing external dust, debris and concrete particles from entering the key component area of ​​the drill bit, reducing component failures caused by wear or jamming; on the other hand, the setting of the protective cover 12 can also prevent the high-speed running drill arm 2 from being directly exposed, reducing the risk of direct contact between operators and high-speed components, and further improving the safety of equipment use.

[0062] A fixing pipe 4 is provided between the hinge point of the drill arm 2 and the mounting base 1. Specifically, Figure 1 As shown, in this embodiment, two drill arms 2 are provided, and two first through-shafts 13 are provided correspondingly, and a fixed pipe 4 is provided between the two first through-shafts 13. Specifically, the fixed pipe 4 can be located at the position where the central axis of the core cutting machine connection part 11 is located. One end of the fixed pipe 4 is fixedly connected to the mounting seat 1, and the other end extends in a direction away from the mounting seat 1. In this embodiment, the fixed pipe 4 can act as a water spray pipe, so the fixed pipe 4 can be provided to be connected to the core cutting machine connection part 11, and the fixed pipe 4 is provided with at least one water spray hole 41. During the core drilling process, a large amount of heat will be generated by high-speed friction between the drill bit and the concrete. By connecting the fixed pipe 4 to the core cutting machine connection part 11 and providing a water spray hole 41 in the fixed pipe 4, the fixed pipe 4 can also serve as a water spray pipe, and water is sprayed out through the core cutting machine 100, the core cutting machine connection part 11, and the fixed pipe 4 to the water spray hole 41, which can effectively reduce the temperature of the drill bit and its surrounding area, prevent the drill bit from being degraded or damaged due to overheating, protect the cutting edge of the drill bit, and extend the service life.

[0063] The fixed tube 4 is slidably connected to the positioning rod 5. Specifically, Figure 1As shown, the diameter of the upper end of the positioning rod 5 is slightly smaller than the inner diameter of the fixed tube 4, so that the positioning rod 5 can be inserted into the fixed tube 4, so that the portion of the positioning rod 5 inserted into the fixed tube 4 can move along the extension direction of the fixed tube 4. Furthermore, the diameter of the rod body of the positioning rod 5 other than the portion that can be inserted into the fixed tube 4 can be slightly larger than the inner diameter of the fixed tube 4, so that the portion of the rod body of the positioning rod 5 that is slightly larger than the inner diameter of the fixed tube 4 acts as a stopper to prevent the positioning rod 5 from being fully inserted into the fixed tube 4 in extreme cases, causing the drill arm 2 to be over-opened. Furthermore, a baffle 6 can be provided inside the fixed tube 4, so that the positioning rod 5 can only move between the baffle 6 and the tube mouth of the fixed tube 4, preventing the positioning rod 5 from being fully inserted into the fixed tube 4 in extreme cases, causing the drill arm 2 to be over-opened.

[0064] In this embodiment, two support rods 3 are provided, one end of the support rod 3 is hinged to the positioning rod 5, and the other end of the support rod 3 is hinged to the drill arm 2. Figure 1 As shown, one end of the support rod 3 is hinged to the drill arm 2 through the second through shaft 22, and the other end of the support rod 3 is hinged to the hinge seat 52 of the positioning rod 5 through the third through shaft 51. In this embodiment, the end of the support rod 3 away from the drill arm 2 can be hinged to different points of the positioning rod 5.

[0065] Further, such as Figure 1 As shown, in this embodiment, the end of the support rod 3 away from the drill arm 2 can also be hinged to the same point of the positioning rod 5 through the third through-shaft 51. In this way, when the positioning rod 5 slides in the direction of the mounting seat 1, the drill arm 2 opens symmetrically (that is, the opening angles are the same); when the positioning rod 5 slides in the direction away from the mounting seat 1, the drill arm 2 contracts symmetrically. The opening or contraction of the drill arm 2 can be achieved by sliding the positioning rod 5, and the operation is intuitive. No complicated operating tools or additional power devices are required, which reduces the difficulty of construction; the positioning rod 5 controls the symmetrical opening and contraction of the drill arm 2, ensuring the synchronization of the movement of the drill arm 2, thereby ensuring that the hole shape formed when the drill bit expands the hole is accurate, and the inner width and outer narrowness characteristics of the bell mouth remain uniform.

[0066] The reaming drill bit provided in this embodiment has a simple structure and is easy to operate. The positioning rod 5 is slidably connected to the fixed tube 4, and the fixed tube 4 is fixedly connected to the mounting seat 1, so that the positioning rod 5 can move under the guidance of the fixed tube 4; the drill arm 2 is hinged with the mounting seat 1 and the support rod 3, and the support rod 3 is hinged with the positioning rod 5, so that when the positioning rod 5 moves along the fixed tube 4, for example, the positioning rod 5 moves in a direction away from the mounting seat 1 to drive the drill arm 2 to shrink until the drill arm 2 is completely retracted, or the positioning rod 5 moves in the direction of the mounting seat 1 to drive the drill arm 2 to open. In this way, the reaming drill bit can flexibly adjust the angle of the drill arm 2 by pressing the positioning rod 5 when in use, and can accurately control the size of the reaming aperture according to the actual repair needs, so as to adapt to the repair scenes of coring holes of different sizes and depths. Using the reaming drill bit provided in this embodiment, a flared mouth with a wide inside and a narrow outside can be formed in the cylindrical cavity formed after core sampling, and concrete can be poured into the coring hole after the reaming to be embedded in the original concrete like a tenon, and the original concrete plays the role of a mortise. This mortise and tenon connection increases the bite force between the two, greatly improving the bonding ability of the new and old concrete, ensuring that the repaired area is not easy to separate.

[0067] Example 2

[0068] This embodiment provides a concrete repair method, using the reaming drill bit provided in Example 1 to repair the concrete. Figure 5 Taking the repair of a core hole with an angle of less than 45° to the horizontal plane as an example, the concrete repair method includes the following steps:

[0069] S1: After the coring machine 100 drills the core sample, the coring drill bit is removed, and the mounting base 1 is connected to the coring machine 100. Specifically, the coring machine connecting portion 11 is connected to the coring machine 100. The coring machine 100 is gradually lowered, and then the reaming drill bit is moved downward until the positioning rod 5 contacts the bottom of the coring hole and stops moving when the positioning rod 5 is centered in the coring hole;

[0070] S2: Turn on the water flow switch, the cooling water flows through the coring machine 100, passes through the coring machine connection part 11, and passes through the fixed pipe 4 until it is sprayed out from the water spray hole 41; start the coring machine 100, the coring machine 100 drives the reaming drill to rotate, and continues to move the reaming drill toward the bottom of the coring hole, and the positioning rod 5 is pressed and moves toward the mounting seat 1, such as Figure 5 As shown, the support rod 3 drives the drill arm 2 to contact the inner wall of the coring hole of the original concrete 300, and the cutting protrusion 21 grinds and cuts the inner wall of the coring hole, that is, the drill arm 2 gradually opens to cut the coring hole wall, as shown in FIG. Figure 8 As shown, the coring hole forms a bell-mouth structure in which the bottom diameter D of the coring hole is larger than the opening diameter d of the coring hole;

[0071] Furthermore, the coring machine 100 can be turned off when the wide diameter D of the bell mouth is about 2 cm to 3 cm larger than the diameter d of the core hole. By stopping the hole expansion when the wide diameter of the bell mouth is 2 to 3 cm larger than the diameter of the core hole, the degree of hole expansion can be accurately controlled to ensure that the hole forms a bell mouth structure that meets the design requirements. This precise control avoids excessive cutting or uneven cutting that may be caused by further hole expansion, and ensures the uniformity and stability of the hole shape during the repair process.

[0072] S3: remove the reaming drill bit and complete the core hole reaming;

[0073] S4: Figure 8 As shown, the horn steel cage 200 is installed into the expanded core hole. Figure 6 , Figure 7 As shown, the trumpet steel cage 200 includes a columnar portion 201 and a trumpet portion 202 connected to the columnar portion 201. The columnar portion 201 may be a steel cage shaped like a cylinder, and the trumpet portion 202 may be a trumpet steel cage expanded in a direction away from the columnar portion 201. The columnar portion 201 and the trumpet portion 202 may be made by bundling 6mm threaded steel. The diameter of the columnar portion 201 is slightly smaller than the diameter of the core hole, and the trumpet portion 202 matches the trumpet structure formed after the hole is expanded. When the trumpet steel cage 200 is loaded into the core hole after the hole is expanded, the trumpet portion 202 may be first tied and tightened with a cable tie, so that the diameter of the trumpet portion 202 is also slightly smaller than the diameter of the core hole. Then, the trumpet steel cage 200 is loaded into the core hole in the manner of first the trumpet portion 202 and then the columnar portion 201. Finally, the cable tie is cut to stretch the trumpet portion 202 to match the trumpet structure formed after the hole is expanded.

[0074] Further, such as Figure 6 As shown, one end of the horn portion 202 away from the columnar portion 201 is bent outward (away from the axial direction) to form a bent end 2021. In S4, after the horn steel cage 200 is installed in the expanded core hole, as shown in FIG. Figure 8 As shown, the bent end 2021 abuts against the core hole wall. The bent end 2021 bent outward prevents other positions of the horn portion 202 from contacting the core hole wall, providing space for subsequent concrete pouring. During the concrete pouring process, the concrete can fully flow into the space around the steel cage, avoiding the problem of uneven pouring caused by the contact between the steel cage and the hole wall, so that the horn steel cage 200 forms a closer combination with the concrete, improving the structural strength and stability of the concrete repair.

[0075] Further, such as Figure 6 , Figure 7 , Figure 8As shown, the trumpet steel cage 200 also includes a water stop strip 203, which is sleeved on the columnar portion 201. Specifically, the water stop strip 203 can be sleeved at the intersection of the columnar portion 201 and the trumpet portion 202, and the diameter of the water stop strip 203 matches the diameter of the core hole. The water stop strip 203 is sleeved on the columnar portion 201, which can be, for example, an annular expansion water stop strip, which improves the waterproof performance of the repaired area, effectively prevents water penetration, and protects the internal structure from erosion. Even in a humid environment or under internal water pressure, it can effectively prevent water penetration, protect the structure from erosion, and enhance the structural strength and waterproof performance of the repaired area.

[0076] S5: Inject concrete with a strength grade higher than the original concrete into the core hole, finish the surface, and complete the concrete repair at the core hole after the concrete is completely solidified. Furthermore, when the angle between the core hole and the horizontal plane is greater than or equal to 45°, a template with a grouting hole can be installed at the core hole to prevent the newly poured self-leveling concrete from overflowing.

[0077] The concrete repair method provided in this embodiment has a simple construction process, convenient operation, and is easy to promote and apply at the construction site. Use a reaming drill to expand the core hole into a trumpet-shaped structure that is wide inside (near the bottom of the hole) and narrow outside (near the hole mouth). The newly poured concrete can be embedded into the original concrete 300 like a tenon, and the original concrete 300 acts as a mortise, greatly improving the bite force between the new and old concretes, forming a mechanical fit, and significantly enhancing the bonding strength, avoiding the problem of easy separation or cracking of the new and old concretes due to the flat interface in the traditional method, ensuring that the repair area is more solid and stable;

[0078] The trumpet steel cage 200 is installed in the expanded core hole. The addition of the trumpet steel cage 200 can form a good combination with the newly poured concrete. During the repair process, when the new concrete is injected into the core hole, a stable connection between the steel cage and the concrete can be formed, which enhances the bonding force between the steel bars and the concrete, avoids the separation problem between the repaired concrete and the original structure, and improves the tensile, shear and bending properties of the concrete, thereby improving the durability of the repaired area;

[0079] Pouring high-strength concrete (one level higher than the original concrete strength grade), for example, self-leveling micro-expanding fine stone concrete, further enhances the strength and impact resistance of the repair area. Self-leveling micro-expanding fine stone concrete can produce slight expansion during the curing process, fill all gaps, reduce shrinkage cracks after repair, improve the density of the repair material, and ensure that the repair area has excellent mechanical properties and volume stability. This method has high economic benefits, reduces the later maintenance costs, and improves the comprehensive benefits of the project.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A reaming drill bit, characterized in that: It comprises a mounting base (1), at least two drilling arms (2) and at least two support rods (3); One end of the drill arm (2) is hinged to the mounting seat (1), a fixed tube (4) is arranged between the hinge points of the drill arm (2) and the mounting seat (1), the fixed tube (4) is slidably connected to the positioning rod (5), one end of the support rod (3) is hinged to the positioning rod (5), and the other end of the support rod (3) is hinged to the drill arm (2).

2. A reaming drill bit according to claim 1, characterized in that: The mounting seat (1) comprises a corer connecting portion (11) and a protective cover (12) connected to the corer connecting portion (11), wherein the corer connecting portion (11) is used to be connected to the corer (100), at least one end of the drill arm (2) is located in the protective cover (12), and the drill arm (2) is hinged to the protective cover (12) via a first through shaft (13).

3. A reaming drill bit according to claim 2, characterized in that: The fixed pipe (4) is in communication with the core-drilling machine connection portion (11), and the fixed pipe (4) is provided with at least one water spray hole (41).

4. A reaming drill bit according to claim 1, characterized in that: When the positioning rod (5) slides in the direction toward the mounting seat (1), the drill arm (2) opens symmetrically; when the positioning rod (5) slides in the direction away from the mounting seat (1), the drill arm (2) contracts symmetrically.

5. The reaming drill bit according to claim 1, characterized in that: The outer wall of the drill arm (2) is an arc-shaped structure.

6. A reaming drill bit according to claim 1, characterized in that: The outer wall of the drill arm (2) is provided with a plurality of cutting protrusions (21).

7. A method for repairing concrete, characterized in that: Using the reaming drill bit according to any one of claims 1 to 6 comprises the following steps: S1: Connect the mounting base (1) to the coring machine (100), and move the reaming drill until the positioning rod (5) contacts the bottom of the coring hole and stops moving; S2: starting the coring machine (100), continuing to move the reaming drill bit toward the bottom of the coring hole, and gradually opening the drill arm (2) to cut the coring hole wall, so that the coring hole forms a bell-mouth structure in which the bottom diameter of the coring hole is larger than the diameter of the coring hole mouth; S3: remove the reaming drill bit and complete the core hole reaming; S4: inserting a trumpet steel cage (200) into the expanded core hole, wherein the trumpet steel cage (200) comprises a columnar portion (201) and a trumpet portion (202) connected to the columnar portion (201), wherein the diameter of the columnar portion (201) is smaller than the diameter of the core hole, and the trumpet portion (202) matches the trumpet mouth structure formed after the hole is expanded; S5: Inject concrete with a strength grade one level higher than the original concrete into the core hole to complete the concrete repair at the core hole.

8. A concrete repair method according to claim 7, characterized in that: In S2, when the diameter of the wide mouth of the bell mouth is 2 cm to 3 cm larger than the diameter of the core hole, the core machine (100) is turned off.

9. A method for repairing concrete according to claim 7, characterized in that: The horn steel cage (200) further comprises a water stop strip (203), wherein the water stop strip (203) is sleeved on the columnar portion (201), and the diameter of the water stop strip (203) matches the diameter of the core hole.

10. A concrete repair method according to claim 7, characterized in that: One end of the horn portion (202) away from the columnar portion (201) is bent outward to form a bent end (2021). In S4, after the horn steel cage (200) is installed in the expanded core hole, the bent end (2021) abuts against the wall of the core hole.

Images