Efficient and energy-saving rotary jet grouting drill bit for pre-stressed anchor rod

Abstract

The utility model relates to the technical field of house building engineering, and discloses an efficient energy-saving pre-stressed anchor rod rotary jet grouting drill bit which comprises an anchor rod body, anchor heads arranged at the two ends of the anchor rod body and a step-shaped drill bit body, the step-shaped drill bit body comprises an upper cylinder, a middle cylinder and a lower cylinder, and all the components are designed to be hollow so as to form a through slurry channel. The drill bit assembly and the limiting inserting rod form a mechanical interlocking structure through the limiting groove, the wedge-shaped matching face converts axial loads into radial supporting force, and three-dimensional space positioning is achieved through matching of the positioning block on the outer side of the annular plate and annular constraint of the annular groove. Annular plates are arranged on the outer sides of the middle cylinder and the lower cylinder, positioning blocks and inner wall annular grooves of the annular plates form full-circumferential constraint, automatic circumferential positioning is completed in cooperation with a two-way guide structure of positioning grooves, deflection of a drill bit under complex geological conditions is effectively controlled through a rigid connection mechanism, shutdown overhaul caused by assembly loosening is avoided, and the service life of the drill bit is prolonged. And the three-dimensional guiding system obviously shortens the field assembly time.

Description

TECHNICAL FIELD

[0001] The utility model relates to house building engineering technical field, concretely is a kind of efficient energy-saving prestressed anchor rod rotary jet grouting drill bit. BACKGROUND

[0002] House building engineering, namely housing construction engineering, is the various types of housing construction and its auxiliary facilities and the line, pipeline, equipment installation engineering and indoor and outdoor decoration engineering matched with it, house building engineering covers the whole process from ground treatment, main structure construction to indoor and outdoor decoration, including residential, commercial, office, industrial and public building and so on various types, in house building engineering, prestressed anchor rod rotary jet grouting drill bit needs to be used, drill bit is jetted cement mortar by high-pressure nozzle, cuts and stirs soil body, forms enlarged head anchoring body, after anchor rod is implanted, by tensioning equipment prestress is applied, makes anchoring body and soil body tightly combined, actively restricts foundation pit deformation, while traditional anchor rod is prone to hole collapse in soft soil layer, and anchoring force is insufficient, and rotary jetting process is mixed with cement mortar and soil body, forms high-strength anchoring body, and uplift capacity is improved.

[0003] Traditional prestressed anchor rod rotary jet grouting drill bit, connecting mechanism is mostly single constraint mode, when drill bit encounters pebble layer or hard interlayer, axial thrust force is prone to cause relative displacement between components, causes connection slackening even structural failure, such problems not only increase equipment downtime maintenance frequency, but also cause energy waste due to repeated operation, simultaneously, traditional drill bit assembly relies on manual calibration, and positioning mechanism lacks three-dimensional constraint mechanism, leading to insufficient assembly accuracy, and construction machinery is in standby state for a long time in the debugging process, further intensifies construction energy consumption, the above defects restrict the energy-saving development of anchor rod construction technology.For this, a kind of efficient energy-saving prestressed anchor rod rotary jet grouting drill bit is provided. Utility model content

[0004] In view of the deficiencies of prior art, the utility model provides a kind of efficient energy-saving prestressed anchor rod rotary jet grouting drill bit to solve the technical problems that the connecting mechanism is mostly single constraint mode, causes connection slackening even structural failure.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: a kind of efficient energy-saving prestressed anchor rod rotary jet grouting drill bit, comprising:

[0006] Anchor rod body and anchor head and stepped drill bit arranged at the top end and bottom end of anchor rod body, and the surface of anchor rod body is additionally provided with coupling sleeve, the stepped drill bit is composed of upper cylinder, middle cylinder and lower cylinder, and anchor rod body, upper cylinder, middle cylinder and lower cylinder are all hollow design;

[0007] The limiting slot is arranged at the top of the upper cylinder, the middle cylinder and the lower cylinder, the inner cavity of the limiting slot is inserted with a limiting plug rod, an annular plate is arranged on the outer side of the middle cylinder and the lower cylinder, the outer side of the annular plate is arranged with a positioning block, and a limiting hole is arranged at the top of the positioning block.

[0008] The positioning slot is arranged on the inner wall of the upper cylinder, the middle cylinder and the lower cylinder, and an annular groove is arranged at the lower part of the inner wall of the upper cylinder, the middle cylinder and the lower cylinder, the annular groove is connected with the bottom of the positioning slot and the limiting slot, and the annular groove is corresponding to the position of the positioning block. The lower cylinder is inserted into the inner cavity of the middle cylinder, the positioning block on the outer side of the lower cylinder is circumferentially positioned with the positioning slot on the inner wall of the middle cylinder, and the positioning block is embedded in the annular groove at the lower part of the inner wall of the middle cylinder to form a full circumferential constraint. The middle cylinder and the upper cylinder are connected in the same way, the automatic centering is realized through the three-dimensional guide system of the positioning slot and the annular groove, the limiting plug rod is inserted into the limiting slot at the top of each cylinder, the limiting plug rod is inserted into the limiting hole of the corresponding positioning block along the limiting slot to realize the connection, and the rigid connection of the drill bit assembly is completed. The anchor rod body penetrates the hollow channel of the stepped drill bit, is connected with the external drilling machine through the connecting sleeve, the drilling machine is started to drive the stepped drill bit to rotate, the lower cylinder first cuts into the stratum to form an initial hole, the middle cylinder gradually expands the hole with the increase of the drilling depth, and the upper cylinder finally completes the formation of the designed hole diameter. During the drilling process, the wedge-shaped matching surface of the limiting plug rod and the limiting slot converts the axial pushing force into the radial supporting force, the annular constraint of the positioning block on the outer side of the annular plate and the annular groove suppresses the deflection of the drill bit assembly under complex geological conditions, the external grouting equipment delivers the cement slurry through the hollow channel of the anchor rod body to the front end of the stepped drill bit, the slurry is injected into the soil layer through the high-pressure rotary jet nozzle to form an anchoring body.

[0009] Preferably, the top of the upper cylinder is arranged with a connecting flange, and the top of the connecting flange is uniformly provided with connecting bolts. The upper cylinder is connected with the anchor rod body through the connecting flange, the connecting bolts penetrate the flange hole positions to realize the rigid connection, the rotating torque of the drilling machine is transmitted to the stepped drill bit through the flange during the drilling process, and the axial pushing force is conducted to the stepped drill bit through the anchor rod body. The mode of the connecting flange ensures the stability of the torque transmission, the uniform distribution design of the connecting bolts disperses the risk of stress concentration, improves the adaptability of the stepped drill bit and the power source, and facilitates quick disassembly and assembly to adapt to different construction equipment requirements.

[0010] Preferably, the inner cavity of the limiting slot is arranged with a connecting handle at the upper part, and the connecting handle is connected with the top end of the corresponding limiting plug rod. The top end of the limiting plug rod is mechanically locked with the limiting slot through the connecting handle, and the limiting plug rod can be separated and connected along the limiting slot through the connecting handle.

[0011] Preferably, a side through groove is formed in the upper part of the inner wall of the limiting groove, and a side clamping column is slidably connected in the inner cavity of the side through groove. The side clamping column slides along the side through groove, and when the limiting plug rod is inserted into the limiting groove, the side wall of the plug rod extrudes the inclined end of the side clamping column, forcing it to shrink into the side through groove, thereby providing double constraints on the limiting plug rod. Even if the main locking mechanism fails due to overload, the side clamping column can still provide backup support, significantly improving the connection redundancy of the drill bit assembly under extreme working conditions.

[0012] Preferably, a reset spring is arranged in the inner cavity of the side through groove, and the two ends of the reset spring are respectively connected with the surface of the side clamping column and the inner wall of the side through groove. The two ends of the reset spring abut against the inner wall of the side through groove and the end face of the side clamping column, and always apply an outward pushing force to the side clamping column. When the limiting plug rod is pulled out, the spring force drives the side clamping column to automatically reset to the initial position, and the elastic reset mechanism eliminates the manual reset operation step of the side clamping column, shortens the drill bit maintenance cycle, and avoids the assembly interference problem caused by the non-reset of the side clamping column.

[0013] Preferably, the outer end of the side clamping column is designed as an inclined surface, and the outer end of the side clamping column is closely attached to the top end of the corresponding limiting plug rod. The outer end of the side clamping column adopts an inclined surface structure, and when the limiting plug rod is inserted, the side wall of the plug rod contacts the inclined surface to generate a component force to drive the side clamping column to automatically retract. No additional operation is required to complete the locking and unlocking of the plug rod. The inclined surface guiding design realizes the tool-free disassembly of the limiting plug rod, reduces the on-site operation difficulty, and the inclined surface contact surface reduces the frictional resistance when the plug rod is inserted, prolonging the service life of the side clamping column.

[0014] Compared with the prior art, the high-efficiency energy-saving prestressed anchor rod rotary jet grouting drill bit provided by the utility model has the following beneficial effects:

[0015] The connecting mechanism of the drill bit assembly and the limiting plug rod and the limiting groove are mechanically interlocked, rigid connection between the cylinders is achieved, when the drill bit bears axial thrust, the wedge-shaped matching surface of the limiting plug rod and the limiting groove converts the axial load into radial support force, and the annular constraint of the annular plate outer side positioning block and the annular groove makes the deflection angle of the drill bit assembly under complex geological conditions controllable at all times. This positioning mechanism effectively avoids the assembly loosening problem of the traditional drill bit in the hard interlayer, reduces the energy waste caused by equipment downtime for maintenance, and ensures the accurate assembly of the drill bit assembly through the three-dimensional guiding system composed of the positioning groove and the annular groove. The bidirectional guiding structure of the positioning groove automatically completes the circumferential positioning of the middle cylinder and the lower cylinder during assembly, and the annular groove is designed with an annular stopper to form a full circumferential constraint with the positioning block, which significantly shortens the on-site assembly time, reduces the standby energy consumption of the construction machinery, and achieves the reduction of construction energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1The utility model discloses a whole structure schematic diagram;

[0017] Figure 2 The utility model discloses an anchor head structure schematic diagram;

[0018] Figure 3 The utility model discloses an anchor head separation structure schematic diagram;

[0019] Figure 4 The utility model discloses an upper cylinder partial section structure schematic diagram;

[0020] Figure 5 The utility model discloses a middle cylinder partial section structure schematic diagram;

[0021] Figure 6 The utility model discloses an attached Figure 5 Partial enlarged structure schematic diagram.

[0022] In the drawing: 1, anchor rod body;2, coupling sleeve;3, anchor head;4, stepped drill bit;5, connecting flange;6, connecting bolt;7, upper cylinder;8, middle cylinder;9, lower cylinder;10, limiting groove;11, limiting plug;12, connecting handle;13, side through groove;14, side clamping column;15, reset spring;16, positioning groove;17, annular groove;18, annular plate;19, positioning block;20, limiting insertion hole. Specific implementation

[0023] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0024] The utility model provides a technical scheme, a kind of high-efficiency energy-saving prestressed anchor rod rotary jet grouting drill bit, comprising: please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 And Figure 5 Anchor rod body 1 and the anchor head 3 and stepped drill bit 4 being set to the top end and bottom end of anchor rod body 1, and the surface of anchor rod body 1 is additionally provided with coupling sleeve 2, stepped drill bit 4 is composed of upper cylinder 7, middle cylinder 8 and lower cylinder 9, and anchor rod body 1, upper cylinder 7, middle cylinder 8 and lower cylinder 9 are all hollow design;

[0025] The limiting groove 10 is arranged at the top of the upper cylinder 7, the middle cylinder 8 and the lower cylinder 9, the inner cavity of the limiting groove 10 is inserted with the limiting plug 11, the outer side of the upper part of the middle cylinder 8 and the lower cylinder 9 is installed with the annular plate 18, the outer side of the annular plate 18 is installed with the positioning block 19, and the top of the positioning block 19 is arranged with the limiting hole 20.

[0026] The positioning groove 16 is arranged at the inner wall of the upper cylinder 7, the middle cylinder 8 and the lower cylinder 9, the inner wall of the lower part of the upper cylinder 7, the middle cylinder 8 and the lower cylinder 9 is arranged with the annular groove 17, the annular groove 17 is connected with the bottom of the limiting groove 10 and the positioning groove 16, and the annular groove 17 is located corresponding to the positioning block 19. The lower cylinder 9 is inserted into the inner cavity of the middle cylinder 8, the positioning block 19 on the outer side of the lower cylinder 9 is circumferentially positioned with the positioning groove 16 on the inner wall of the middle cylinder 8, and the positioning block 19 is embedded in the annular groove 17 on the lower part of the inner wall of the middle cylinder 8 to form a full circumferential constraint. The middle cylinder 8 and the upper cylinder 7 are connected in the same way, the automatic centering is realized through the three-dimensional guide system of the positioning groove 16 and the annular groove 17, the limiting plug 11 is inserted into the limiting groove 10 at the top of each cylinder, the limiting plug 11 is inserted into the limiting hole 20 corresponding to the positioning block 19 along the limiting groove 10 to be connected, the rigid connection of the drill bit assembly is completed, the anchor rod body 1 penetrates the hollow channel of the stepped drill bit 4, is connected with the external drilling machine through the connecting sleeve 2, the drilling machine is started to drive the stepped drill bit 4 to rotate, the lower cylinder 9 first cuts into the stratum to form an initial hole, the middle cylinder 8 gradually expands the hole with the increase of the drilling depth, and the upper cylinder 7 finally completes the formation of the designed hole diameter. In the drilling process, the wedge-shaped matching surface of the limiting plug 11 and the limiting groove 10 converts the axial advancing force into the radial supporting force, cooperates with the annular constraint of the positioning block 19 on the outer side of the annular plate 18 and the annular groove 17 to inhibit the deflection of the drill bit assembly under the complex geological conditions, the external grouting equipment transports the cement slurry to the front end of the stepped drill bit 4 through the hollow channel of the anchor rod body 1, the slurry is injected into the stratum at high pressure through the rotary jet nozzle to form an anchoring body, the bidirectional guide structure of the positioning groove 16 automatically completes the circumferential positioning of the middle cylinder 8 and the lower cylinder 9 during assembly, the annular groove 17 is designed to form a full circumferential constraint with the positioning block 19, which significantly shortens the on-site assembly time and reduces the standby energy consumption of the construction machinery.

[0027] Please refer to Figure 2The top of the upper cylinder 7 is provided with a connecting flange 5, and the top of the connecting flange 5 is uniformly provided with connecting bolts 6. The top of the upper cylinder 7 is connected to the anchor rod body 1 through the connecting flange 5, and the connecting bolts 6 penetrate the flange holes to realize rigid connection. During drilling, the rotating torque of the drilling machine is transmitted to the stepped drill bit 4 through the flange, and the axial thrust force is transmitted to the stepped drill bit 4 through the anchor rod body 1. The connecting flange 5 ensures the stability of torque transmission, and the uniform distribution of the connecting bolts 6 disperses the risk of stress concentration, improves the adaptability of the stepped drill bit 4 and the power source, and facilitates quick disassembly and assembly to meet the needs of different construction equipment.

[0028] Please refer to Figure 6 The inner cavity of the limiting groove 10 is provided with a connecting handle 12 at the upper part, and the connecting handle 12 is connected to the top end of the corresponding limiting plug rod 11. The top end of the limiting plug rod 11 is mechanically locked with the limiting groove 10 through the connecting handle 12, and the limiting plug rod 11 can be separated and connected along the limiting groove 10 through the connecting handle 12. A side through groove 13 is formed in the inner wall of the limiting groove 10, and a side clamping column 14 is slidably connected in the inner cavity of the side through groove 13. The side clamping column 14 slides along the side through groove 13. When the limiting plug rod 11 is inserted into the limiting groove 10, the side wall of the plug rod extrudes the inclined end of the side clamping column 14, forcing it to shrink into the side through groove 13, forming double constraints on the limiting plug rod 11. Even if the main locking mechanism fails due to overload, the side clamping column 14 can still provide backup support, significantly improving the connection redundancy of the drill bit assembly under extreme working conditions. The inner cavity of the side through groove 13 is provided with a reset spring 15, and the two ends of the reset spring 15 are respectively connected to the surface of the side clamping column 14 and the inner wall of the side through groove 13. The two ends of the reset spring 15 abut against the inner wall of the side through groove 13 and the end face of the side clamping column 14, always applying an outward pushing force to the side clamping column 14. When the limiting plug rod 11 is pulled out, the spring force drives the side clamping column 14 to automatically reset to the initial position. The elastic reset mechanism eliminates the manual reset operation step of the side clamping column 14, shortens the drill bit maintenance cycle, and avoids the assembly interference problem caused by the non-reset of the side clamping column 14. The outer end of the side clamping column 14 is designed as an inclined surface, and the outer end of the side clamping column 14 tightly fits the top end of the corresponding limiting plug rod 11. The outer end of the side clamping column 14 adopts an inclined surface structure. When the limiting plug rod 11 is inserted, the side wall of the plug rod contacts the inclined surface to generate a force that drives the side clamping column 14 to automatically retract. No additional operation is required to complete the locking and unlocking of the plug rod. The inclined surface design realizes tool-free disassembly of the limiting plug rod 11, reduces the difficulty of on-site operation, and reduces the frictional resistance when the plug rod is inserted, prolonging the service life of the side clamping column 14.

[0029] The scheme: insert the lower cylinder 9 into the inner cavity of the middle cylinder 8, and the positioning block 19 on the outer side of the lower cylinder 9 is circumferentially positioned with the positioning groove 16 on the inner wall of the middle cylinder 8, and at the same time the positioning block 19 is embedded in the annular groove 17 on the lower part of the inner wall of the middle cylinder 8 to form full circumferential constraint, and the middle cylinder 8 is connected with the upper cylinder 7 in the same way, and the automatic centering is realized through the three-dimensional guide system of the positioning groove 16 and the annular groove 17, and the axis of each component is ensured to coincide, the limiting rod 11 is inserted into the limiting slot 10 at the top of each cylinder, the limiting rod 11 is inserted into the limiting hole 20 corresponding to the positioning block 19 along the limiting slot 10, and the side clamping column 14 is tightly attached to the top of the limiting rod 11 under the action of the reset spring 15 to form constraint, the top of the upper cylinder 7 is connected with the bottom end of the anchor rod body 1 through the connecting flange 5, the connecting bolt 6 penetrates the flange hole to realize rigid connection, the assembly of the drill bit assembly and the anchor rod body 1 is completed, the anchor rod body 1 penetrates the hollow channel of the stepped drill bit 4, and the coupling sleeve 2 is connected with the external drilling machine power head to ensure that the torque transmission path is unobstructed;

[0030] Start the drilling machine to drive the stepped drill bit 4 to rotate, the lower cylinder 9 first cuts into the stratum to form an initial hole, the middle cylinder 8 gradually expands the hole with the increase of the drilling depth, and the upper cylinder 7 finally completes the formation of the designed hole diameter, in the drilling process, the wedge-shaped matching surface of the limiting rod 11 and the limiting slot 10 converts the axial pushing force into radial supporting force, cooperates with the annular constraint of the positioning block 19 on the outer side of the annular plate 18 and the annular groove 17 to inhibit the deflection of the drill bit assembly under complex geological conditions, and the external grouting equipment delivers cement slurry to the front end of the stepped drill bit 4 through the hollow channel of the anchor rod body 1, the slurry is injected into the soil layer at high pressure through the rotary jet nozzle to form an anchoring body;

[0031] After reaching the designed depth, stop drilling, keep the grouting pressure until the anchoring body is solidified to ensure that the anchor rod body 1 and the stratum form effective anchoring, when disassembling the drilling machine, pull out the limiting rod 11 through the connecting handle 12, the side clamping column 14 is automatically reset under the action of the reset spring 15 to avoid assembly interference, and the mechanical interlocking structure of the limiting rod 11 prevents the drill bit assembly from accidentally falling off.

[0032] It should be noted that in this text, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0033] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency energy-saving prestressed anchor rod rotary jet grouting drill bit, characterized in that, Include: The anchor rod body (1), and the anchor head (3) and the stepped drill bit (4) arranged at the top and bottom of the anchor rod body (1), and the surface of the anchor rod body (1) is provided with a coupling sleeve (2), the stepped drill bit (4) is composed of an upper cylinder (7), a middle cylinder (8) and a lower cylinder (9), and the anchor rod body (1), the upper cylinder (7), the middle cylinder (8) and the lower cylinder (9) are all hollow designs; The limiting groove (10) is arranged at the top of the upper cylinder (7), the middle cylinder (8) and the lower cylinder (9), the inner cavity of the limiting groove (10) is inserted with a limiting plug rod (11), an annular plate (18) is installed on the outer side of the middle cylinder (8) and the lower cylinder (9), the outer side of the annular plate (18) is installed with a positioning block (19), and a limiting hole (20) is formed at the top of the positioning block (19); The positioning groove (16) is formed on the inner wall of the upper cylinder (7), the middle cylinder (8) and the lower cylinder (9), and the annular groove (17) is formed on the inner wall of the upper cylinder (7), the middle cylinder (8) and the lower cylinder (9), the annular groove (17) is connected with the bottom of the limiting groove (10) and the positioning groove (16).

2. The high-efficiency energy-saving prestressed anchor rod rotary jet grouting drill bit according to claim 1, characterized in that: The top of the upper cylinder (7) is installed with a connecting flange (5), and the top of the connecting flange (5) is uniformly provided with connecting bolts (6).

3. The high-efficiency energy-saving prestressed anchor rod rotary jet grouting drill bit according to claim 1, characterized in that: The inner cavity of the limiting groove (10) is installed with a connecting handle (12), and the connecting handle (12) is connected with the top end of the corresponding limiting plug rod (11).

4. The high-efficiency energy-saving prestressed anchor rod rotary jet grouting drill bit according to claim 1, characterized in that: The inner wall of the limiting groove (10) is provided with a side through groove (13), and the side through groove (13) is slidably connected with a side clamping column (14).

5. The high-efficiency energy-saving prestressed anchor rod rotary jet grouting drill bit according to claim 4, characterized in that: The inner cavity of the side through groove (13) is provided with a reset spring (15), and the two ends of the reset spring (15) are respectively connected with the surface of the side clamping column (14) and the inner wall of the side through groove (13).

6. The high-efficiency energy-saving prestressed anchor rod rotary jet grouting drill bit according to claim 5, characterized in that: The outer end of the side clamping column (14) is designed as an inclined surface, and the outer end of the side clamping column (14) is tightly attached to the top end of the corresponding limiting plug rod (11).

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