Rock soil reaming device for anchor rod foundation construction

Abstract

The invention discloses a rock and soil reaming device for anchor rod foundation construction, and relates to the technical field of anchor rod foundation construction equipment.The rock and soil reaming device comprises a rotating assembly and a driving assembly, the rotating assembly comprises a rotating disc, a sliding part and a connecting shaft, the rotating disc is rotationally connected to a rack, and one end of the connecting shaft is rotationally connected with the sliding part; the sliding part is movably matched with the rotating disc in the radial direction of the rotating disc, so that the drill rod gradually deviates from the axis of the rotating disc; the driving assembly drives the connecting shaft to rotate through the tensioning transmission mechanism and is in transmission connection with the rotating disc through the speed reducer so that the rotating assembly can rotate. When the sliding part moves to enable the connecting shaft to gradually deviate from the axis of the rotating disc, the driving assembly drives the rotating assembly to rotate through the speed reducer to enable the connecting shaft and the drill rod to revolve around the axis of the rotating disc, and therefore a drill bit on the drill rod can conduct radial rotary drilling towards the side wall of the straight hole section of the anchor hole, and a hole expanding section with the expanded hole diameter is formed.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of anchor rod foundation construction equipment, in particular to a rock and soil hole expanding device for anchor rod foundation construction. BACKGROUND

[0002] In rock anchor foundation, spiral anchor-rock anchor composite foundation with soil on top and rock below, and prefabricated pipe pile-rock anchor composite foundation with soil on top and rock below, improving the single anchor rod uplift capacity is of great significance to reducing costs and expanding the range of use. With the help of grouting technology, the end expanding anchor rod has outstanding advantages in low hardness rock soil layer or rock soil layer with limited anchor rod length, such as high uplift capacity, long free section and small anchor head displacement.

[0003] The anchor rod foundation construction process is usually as follows: first, drill the anchor hole according to the requirements by the drilling equipment, and clean the rock slag and sundries in the hole; then, lower the prefabricated anchor rod, and if necessary, simultaneously lay the grouting pipe; then, use the pressure grouting method to inject cement slurry and other consolidation materials into the hole, and wait for the slurry to solidify to the designed strength; finally, according to the engineering requirements, the anchor rod is tensioned and locked to complete the entire foundation construction and ensure that the anchor rod plays the anchoring bearing role.

[0004] The diameter of the drill bit of the anchor rod drilling device is usually larger than the diameter of the drill rod. The diameter of the drill bit determines the diameter of the anchor hole. Usually, only anchor holes with equal diameters of each segment can be drilled. The anchor rod and the rock soil layer are connected only through the adhesive force of the consolidation material. The uplift capacity and bearing capacity of the anchor rod foundation formed finally still have room for improvement. Therefore, the anchor hole wall expanding technology is applied. By expanding, an enlarged head is formed at the end of the anchor rod, which can greatly increase the contact area and cutting force of the consolidation material and the hole wall rock soil body, significantly improve the uplift bearing capacity of the single anchor rod, and additionally optimize the hole wall shape, reduce the risk of hole wall collapse caused by loose strata, and provide more space for subsequent grouting, ensure that the slurry is fully filled and tightly combined with the rock soil body, and improve the overall stability of the anchoring system.

[0005] A hole expanding device for rock anchor drilling is disclosed in the patent with the publication number CN221646854U. The device includes a drilling pipe, an axial drill bit device connected to the bottom of the drilling pipe, four mutually symmetrical rectangular holes opened on the side of the pipe body of the drilling pipe, a concave sliding groove opened on the upper and lower sides of each hole, a hole expanding device slidingly fitted in the sliding groove, a lateral hole expanding drill bit device installed on the upper part of the hole expanding device, a guide device installed inside the drilling pipe, a pressure bearing device installed at the bottom of the guide device, and a spring connected between the guide device and the pressure bearing device. The pressure bearing device can move along the axial stress direction under the action of pressure. The lateral hole expanding drill bit device extends out of the sliding groove in the drilling pipe, realizing the expansion of the anchor hole.

[0006] The reaming device for the current anchor rod foundation construction has obvious defects, the anchor hole diameter of the small and medium-sized anchor rod foundation is usually 26-50mm, which is matched with the diameter of the drill bit, the hole is arranged on the side of the drill rod or the drill bit, and the reaming bit is movably arranged in the hole, and the driving structure is arranged inside, the strength of the drill rod or the drill bit is inevitably reduced due to the limitation of the size of the drill rod or the drill bit, and the strength of the reaming bit is not high due to the small size. SUMMARY

[0007] The purpose of the present application is to provide a rock and soil reaming device for anchor rod foundation construction to solve the problems of the drill rod or the drill bit in the hole of the existing technology, the strength of the drill rod or the drill bit is reduced due to the hole arranged on the side wall, and the strength of the reaming bit is not high due to the small size.

[0008] In order to achieve the above purpose, the present application provides the following technical scheme: a rock and soil reaming device for anchor rod foundation construction, comprising a rotating assembly and a driving assembly, the rotating assembly comprises a rotating disc, a sliding part and a connecting shaft, the rotating disc is rotationally connected to the rack, one end of the connecting shaft is rotationally connected to the sliding part, and the other end is used for connecting the drill rod, the sliding part is movably connected to the rotating disc along the radial direction of the rotating disc to make the drill rod gradually deviate from the axis of the rotating disc; the driving assembly drives the connecting shaft to rotate through a tension transmission mechanism, and is transmissionally connected to the rotating disc through a speed reducer to make the rotating assembly rotate.

[0009] Further, the driving assembly comprises a driving motor fixedly installed on the rack.

[0010] Further, the tension transmission mechanism comprises a chain assembly and a tension assembly, the chain assembly is transmissionally connected to the output shaft of the driving motor and the connecting shaft, and the tension assembly is used for tensioning the chain of the chain assembly.

[0011] Further, the tension assembly comprises a spring rod and a tension sprocket, one end of the spring rod is fixedly connected to the rack, the other end is rotationally connected to the tension sprocket, and the tension sprocket is meshingly connected with the chain.

[0012] Further, the chain assembly comprises a driving sprocket, a driven sprocket and a chain, the driving sprocket is coaxially fixedly connected to the output shaft of the driving motor, the driven sprocket is coaxially fixedly connected to the connecting shaft, and the chain is transmissionally arranged between the driving sprocket and the driven sprocket.

[0013] Further, the speed reducer comprises a gear ring and a driving gear, the gear ring is coaxially fixedly connected to the rotating disc, the driving gear is coaxially fixedly connected to the output shaft of the driving motor, and the base circle diameter of the gear ring is greater than that of the driving gear and they are meshed.

[0014] Further, the rotating disc is rotationally connected with a screw rod which is threadedly connected with the sliding part, and a first bevel gear coaxial with the rotating disc is arranged on the frame, and a second bevel gear coaxial with the first bevel gear is fixedly connected with the screw rod.

[0015] Further, the driving assembly comprises a first motor and a second motor, the driving motor is used for driving the connecting shaft to rotate by the tension transmission mechanism, and the second motor is drivingly connected with the rotating disc through a speed reducer to drive the rotating assembly to rotate.

[0016] Further, the tension transmission mechanism comprises a belt assembly and a tension assembly, the belt assembly is drivingly connected with the output shaft of the driving motor and the connecting shaft, and the tension assembly is used for tensioning the toothed belt of the belt assembly.

[0017] Compared with the prior art, the rock and soil hole expanding device for anchor rod foundation construction provided by the application drives the connecting shaft to rotate by the tension transmission mechanism when the connecting shaft is coaxial with the rotating disc, so that the drill rod connected with the connecting shaft drills a straight hole section of the anchor hole in the rock and soil layer, and the driving assembly drives the rotating assembly to rotate by the speed reducer to make the connecting shaft and the drill rod revolve around the axis of the rotating disc (i.e. the straight hole section of the anchor hole) while the sliding part moves to make the connecting shaft gradually deviate from the axis of the rotating disc, so that the drill bit on the drill rod can drill radially to the sidewall of the straight hole section of the anchor hole to form an expanding section with an enlarged hole diameter. The hole expanding operation can be performed without modifying the inherent structure of the drill bit or the drill rod, so that the structural strength of the drill bit or the drill rod is not weakened. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the drawings used in the embodiments will be briefly introduced as follows.

[0019] Figure 1 The overall structural schematic diagram provided for the embodiments; Figure 2 The internal structural schematic diagram provided for the embodiments Figure I ; Figure 3 The internal structural schematic diagram provided for the embodiments Figure II ; Figure 4 The structural top view provided for the embodiments; Figure 5 The Figure 4 structural sectional view along line A-A in the embodiments; Figure 6 The structural sectional view when the connecting shaft is coaxial with the rotating disc provided for the embodiments.

[0020] Explanation of reference signs: 100, frame; 101, protective shell; 102, support; 200, rotating assembly; 201, rotating disc; 202, screw rod; 203, sliding part; 204, first bevel gear; 205, second bevel gear; 206, connecting shaft; 300, driving assembly; 301, driving motor; 302, output shaft; 303, shaft stabilizer; 400, tension transmission mechanism; 401, driving sprocket; 402, driven sprocket; 403, chain; 404, tension sprocket; 405, spring rod; 500, speed reducer; 501, driving gear; 502, ring gear; 600, locking piece; 601, bolt; 602, locking hole; 700, drill rod; 701, drill bit. DETAILED DESCRIPTION

[0021] In order to make the technical personnel in the art better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings.

[0022] Please refer to Figures 1-6 The rock and soil hole expanding device for anchor rod foundation construction provided by the embodiment of the present application comprises a frame 100, a driving assembly 300 and a rotating assembly 200. The frame 100 can be connected to a positioning base (or a vehicle frame) in the prior art. The rotating assembly 200 is located in a protective shell 101 on the frame 100 and mainly comprises a rotating disc 201, a sliding part 203 and a connecting shaft 206. The rotating disc 201 is rotationally connected to the frame 100. A sliding groove is formed in the rotating disc 201 along a radial direction. The sliding groove extends from the axis of the rotating disc 201 to the edge. The sliding part 203 is slidingly connected to the sliding groove, so that the sliding part 203 moves along the radial direction of the rotating disc 201 and cooperates with the rotating disc 201. The axis of the connecting shaft 206 is consistent with the axis of the rotating disc 201. One end of the connecting shaft 206 is rotationally connected to the sliding part 203, and the other end is used to connect a drill rod 700. The drill bit 701 is installed on the end of the drill rod 700 away from the connecting shaft 206. During the sliding stroke of the sliding part 203 relative to the rotating disc 201, the connecting shaft 206 has a coaxial state coaxial with the rotating disc 201 and an eccentric state eccentric to the rotating disc 201. During the movement of the connecting shaft 206 from the axis of the rotating disc 201 to the edge through the sliding part 203, the connecting shaft 206 is switched from the coaxial state to the eccentric state, so that the drill rod 700 connected to the connecting shaft 206 gradually deviates from the axis of the rotating disc 201.

[0023] The driving assembly 300 is installed on the frame 100. The driving assembly 300 drives the connecting shaft 206 to rotate through the tension transmission mechanism 400 and drives the rotating assembly 200 to rotate through the transmission connection between the speed reducer 500 and the rotating disc 201. The driving assembly 300 can make the connecting shaft 206 in the coaxial state rotate and make the connecting shaft 206 in the eccentric state rotate while slowly revolving around the axis of the rotating disc 201.

[0024] As one of the technical solutions of the driving assembly 300, a single motor scheme is adopted, the driving assembly 300 comprises a driving motor 301, and the housing of the driving motor 301 is connected with the rack 100 in a fixed connection mode through screwing or welding. The rack 100 is fixedly connected with a shaft stabilizer 303, the shaft stabilizer 303 is rotatably connected with an output shaft 302 through a bearing, and the output shaft 302 is coaxially and fixedly connected with the rotating shaft of the driving motor 301, so that the rotating shaft of the driving motor 301 has better anti-non-axial force capacity.

[0025] The tensioning transmission mechanism 400 comprises a chain assembly and a tensioning assembly, the chain assembly is transmissionally connected with the output shaft 302 of the driving motor 301 and the connecting shaft 206, specifically, the chain assembly comprises a driving sprocket 401, a driven sprocket 402 and a chain 403, the driving sprocket 401 is coaxially and fixedly connected with the output shaft 302 of the driving motor 301, the driven sprocket 402 is coaxially and fixedly connected with the connecting shaft 206, and the chain 403 is transmissionally sleeved between the driving sprocket 401 and the driven sprocket 402. The tensioning assembly is used for tensioning the chain 403 of the chain assembly, specifically, the tensioning assembly comprises a spring rod 405 and a tensioning sprocket 404, one end of the spring rod 405 is fixedly connected with the rack 100 through the support 102, the other end is rotatably connected with the central shaft of the tensioning sprocket 404, and the tensioning sprocket 404 is in meshing cooperation with the chain 403. In the process that the connecting shaft 206 moves relative to the rotating disc 201 through the sliding part 203, the distance between the driving sprocket 401 and the driven sprocket 402 also changes, and the tensioning sprocket 404 can always tension the chain 403 under the tension of the spring rod 405 of the tensioning assembly.

[0026] Of course, the chain assembly can also be replaced by a belt assembly (not shown in the figure), the belt assembly transmissionally connects the output shaft 302 of the driving motor 301 and the connecting shaft 206, the belt assembly comprises a driving pulley, a driven pulley and a toothed belt, the driving pulley is coaxially and fixedly connected with the output shaft 302 of the driving motor 301, the driven pulley is coaxially and fixedly connected with the connecting shaft 206, and the toothed belt is transmissionally sleeved between the driving pulley and the driven pulley. The tensioning sprocket 404 of the tensioning assembly is replaced by a tensioning pulley, the tensioning pulley is in meshing cooperation with the toothed belt and is under the tension of the spring rod 405.

[0027] The driving motor 301 drives the output shaft 302 to rotate. The output shaft 302 drives the connecting shaft 206 and the drill pipe 700 to rotate through the chain assembly, and drives the rotating disc 201 to rotate through the speed reducer 500, so that the rotating assembly 200 rotates slowly as a whole. The speed reducer 500 should have a clutch function, and a speed reducer with a clutch in the prior art can be used. In a simple structure, the speed reducer 500 includes a gear ring 502 and a driving gear 501. The gear ring 502 is coaxially fixedly connected with the rotating disc 201, and the driving gear 501 is coaxially fixedly connected with the output shaft 302 of the driving motor 301. The base circle diameter of the gear ring 502 is greater than that of the driving gear 501, and the two are in meshing relationship, so that the output shaft 302 drives the rotating assembly 200 to rotate through the cooperation of the driving gear 501 and the gear ring 502.

[0028] As another technical solution of the driving assembly 300, a double-motor scheme is adopted, and the connecting shaft 206 and the rotating disc 201 are driven by different driving sources, i.e., the driving assembly 300 includes a first motor and a second motor (not shown in the figure). The driving motor 301 is used to drive the connecting shaft 206 to rotate through the tensioning transmission mechanism 400, and the second motor is in transmission connection with the rotating disc 201 through the speed reducer 500 to drive the rotating assembly 200 to rotate.

[0029] In order to provide driving force for the sliding part 203 to move on the rotating disc 201, a screw rod 202 is coaxially connected to the rotating disc 201. The screw rod 202 is located in the sliding groove, and the length direction of the screw rod 202 is consistent with the length direction of the sliding groove. A threaded hole is formed in the sliding part 203 and is in threaded connection with the screw rod 202. A first bevel gear 204 is fixedly connected to the rack 100 and is coaxial with the rotating disc 201. A second bevel gear 205 is fixedly connected to the screw rod 202 and is coaxial with the first bevel gear 204. The size (module, number of teeth, etc.) of the second bevel gear 205 is consistent with that of the first bevel gear 204, and the two are axially perpendicular and in meshing relationship. When the rotating disc 201 rotates, the second bevel gear 205 rotates together through the screw rod 202. The second bevel gear 205 revolves around the first bevel gear 204 while maintaining the meshing relationship with the first bevel gear 204, thereby driving the shaft to rotate. The shaft and the sliding part 203 are in threaded connection, so that the sliding part 203 slides in the sliding groove, thereby gradually offsetting the connecting shaft 206 and the drill pipe 700 from the coaxial state to the eccentric state, and gradually increasing the eccentricity.

[0030] It should be noted that in the above embodiment where the drive motor 301 drives the connecting shaft 206 to rotate and the rotary disk 201 to drill, the first bevel gear 204 is fixedly connected to the frame 100 on the premise that the reducer 500 has a clutch function to ensure that the reducer 500 is in a decoupled state when drilling the straight section of the anchor hole, so that the connecting shaft 206 can always remain coaxial, so that the drill rod 700 can drill the straight section of the anchor hole. In the embodiment described above, where the drive motor 301 drives the connecting shaft 206 to rotate and the rotary disk 201 to drill, the reducer 500 does not have a clutch function. Therefore, the first bevel gear 204 and the frame 100 should be designed to be rotatably connected, and a locking element 600 should be added between the first bevel gear 204 and the frame 100. When the locking element 600 is locked, the first bevel gear 204 and the frame 100 are fixed and cannot rotate. The second bevel gear 205 rotates around the first bevel gear 204 while rotating on its own axis. When the locking element 600 is unlocked, the first bevel gear 204 can rotate relative to the frame 100. When the second bevel gear 205 rotates around the first bevel gear 204, it will drive the first bevel gear 204 to rotate together. The second bevel gear 205 does not rotate on its own axis (the rotational resistance of the first bevel gear 204 is much smaller than the resistance of the screw 202 rotating relative to the threaded hole). The locking member 600 includes a pin 601 inserted into the frame 100 and at least one locking hole 602 opened on the end face of the first bevel gear 204. When the pin 601 is inserted into the locking hole 602, the first bevel gear 204 is fixed relative to the frame 100. When the pin 601 is removed from the locking hole 602, the first bevel gear 204 can rotate freely.

[0031] This invention allows for hole enlargement operations without modifying the inherent structure of the drill bit 701 or drill rod 700, thus maintaining the structural strength of the drill bit 701 or drill rod 700. During anchor foundation construction, with the connecting shaft 206 coaxial with the rotating disk 201, refer to... Figure 5 When the reducer 500 is in a decoupled state or the locking element 600 is in an unlocked state, the rotating component 200 drives the driving component 300 to drive the connecting shaft 206 to rotate via the tensioning transmission mechanism 400, thereby causing the drill rod 700 connected to the connecting shaft 206 to drill a straight section of the anchor hole in the soil and rock layer; when hole enlargement is required, refer to Figure 6 The reducer 500 is coupled or the locking element 600 is locked. The rotating component 200 drives the connecting shaft 206 to rotate through the tension transmission mechanism 400. The rotating component 200 also drives the rotating disk 201 to rotate through the reducer 500, so that the connecting shaft 206 gradually deviates from the axis of the rotating disk 201 and revolves around the rotating disk 201, thereby enabling the drill bit 701 on the drill rod 700 to radially drill into the side wall of the straight hole section of the anchor hole, forming an enlarged hole section.

[0032] The maximum eccentricity of the drill rod 700 is equal to the difference between the radius of the reaming section and the radius of the half-hole section, i.e. the difference between the outer contour radius of the drill bit 701 and the radius of the drill rod 700. In small and medium-sized anchor rod foundation construction operations, common specifications of the drill rod are B19 (φ19mm), B22 (φ22mm), and φ26-33mm drill bits are matched. Taking the B22 anchor rod matched with the φ33mm drill bit as an example, the straight hole section diameter of the anchor hole is equal to the drill bit diameter, i.e. 33mm, and the reaming section diameter is the drill bit diameter*2-drill rod diameter, i.e. 44mm.

[0033] The above describes certain exemplary embodiments of the present application and should not be construed as limiting the scope of protection of the claims of the present application. For those skilled in the art, the described embodiments can be modified in other different ways without departing from the spirit and scope of the present application.

Claims

1. A rock and soil reaming device for anchor foundation construction, comprising a rotating assembly and a driving assembly, characterized in that: the rotating assembly comprises a rotating disc, a sliding part and a connecting shaft, the rotating disc is rotationally connected to a rack, one end of the connecting shaft is rotationally connected to the sliding part, and the other end is used for connecting a drill rod, the sliding part is movably connected to the rotating disc along the radial direction of the rotating disc to gradually offset the drill rod from the axis of the rotating disc; the driving assembly drives the connecting shaft to rotate through a tension transmission mechanism, and is transmissionally connected to the rotating disc through a speed reducer to rotate the rotating assembly.

2. The rock ground hole enlarging device for the construction of the rock foundation of the anchor rod according to claim 1, characterized in that, the driving assembly comprises a driving motor fixedly installed on the rack.

3. The rock ground hole enlarging device for the construction of a rock foundation according to claim 2, characterized by, the tension transmission mechanism comprises a chain assembly and a tension assembly, the chain assembly is transmissionally connected to the output shaft of the driving motor and the connecting shaft, and the tension assembly is used for tensioning the chain of the chain assembly.

4. The rock ground hole enlarging device for the construction of a rock foundation according to claim 3, characterized by the tension assembly comprises a spring rod and a tension sprocket, one end of the spring rod is fixedly connected to the rack, the other end is rotationally connected to the tension sprocket, and the tension sprocket is meshingly connected to the chain.

5. The rock ground hole enlarging device for the construction of the rock foundation of the anchor rod according to claim 3, characterized in that, the chain assembly comprises a driving sprocket, a driven sprocket and a chain, the driving sprocket is coaxially fixedly connected to the output shaft of the driving motor, the driven sprocket is coaxially fixedly connected to the connecting shaft, and the chain is transmissionally sleeved between the driving sprocket and the driven sprocket.

6. The rock ground hole enlarging device for the construction of the rock foundation of the anchor rod according to claim 1, characterized in that, the speed reducer comprises a gear ring and a driving gear, the gear ring is coaxially fixedly connected to the rotating disc, the driving gear is coaxially fixedly connected to the output shaft of the driving motor, and the base circle diameter of the gear ring is greater than that of the driving gear and they are meshed.

7. The rock ground hole enlarging device for the construction of the rock foundation of the anchor rod according to claim 1, characterized in that, a screw is rotationally connected to the rotating disc and is threadedly connected to the sliding part, a first bevel gear coaxial with the rotating disc is arranged on the rack, and a second bevel gear coaxial with the screw is fixedly connected to the screw and is meshed with the first bevel gear.

8. The rock ground hole enlarging device for the construction of the rock foundation of the anchor rod according to claim 1, characterized in that, the driving assembly comprises a first motor and a second motor, the driving motor is used for driving the connecting shaft to rotate through the tension transmission mechanism, and the second motor is transmissionally connected to the rotating disc through the speed reducer to rotate the rotating assembly.

9. The rock ground hole enlarging device for the construction of the rock foundation of the anchor rod according to claim 2, characterized in that, the tension transmission mechanism comprises a belt assembly and a tension assembly, the belt assembly is transmissionally connected to the output shaft of the driving motor and the connecting shaft, and the tension assembly is used for tensioning the toothed belt of the belt assembly.

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