A rotary drilling rig for road crossing pile construction

Abstract

This utility model discloses a rotary drilling rig for road crossing pile construction, belonging to the field of rotary drilling technology. It mainly includes an excavator with lifting support legs fixedly connected to its four corners. A rotary drilling guide mechanism is rotatably connected to the front end of the excavator. A hydraulic cylinder is rotatably connected between the excavator and the rotary drilling guide mechanism. The rotary drilling guide mechanism contains a telescopic mechanism, and a rotary drilling power mechanism is fixedly connected to the telescopic end of the telescopic mechanism. A drill rod fixing mechanism for quick drill body replacement is fixedly connected to the power output end of the rotary drilling power mechanism. The drill rod fixing mechanism is fixedly connected to the drill body. This utility model solves the problems of uneven ground during road crossing construction, making it difficult to ensure drilling verticality and entry angle. It is compatible with quick replacement of various drill bodies, including round and hexagonal drill rods, and can cover various geological drilling requirements common at road crossings, exhibiting strong versatility. This utility model is mainly used for processing road crossing pile holes.

Description

Technical Field

[0001] This utility model belongs to the field of rotary drilling technology, and more specifically, it relates to a rotary drilling rig for road crossing pile construction. Background Technology

[0002] Level crossing bollards are important safety facilities installed on both sides of railway and highway level crossings to warn drivers of the presence of a railway crossing ahead, requiring them to slow down and be vigilant. Depending on the type of bollard, the application scenario, and geological conditions, the embedment depth of level crossing bollards is controlled between 0.6 and 1.2 meters, and must not be less than half the length of the bollard. Currently, the construction of level crossing bollards generally adopts a step-by-step operation mode using manual excavation or general-purpose rotary drilling rigs. This involves first drilling holes with a rotary drilling rig, then using a crane to lift and install precast bollards, and finally manually backfilling with concrete or mortar to fix them in place.

[0003] For example, patent publication number "CN221822905U" discloses a tracked walking spiral pile drilling rig, including an excavator, a fixed frame, a hydraulic spiral drilling rig, and hot-dip galvanized spiral piles. The fixed frame is detachably mounted on the front end of the excavator's boom, and the hydraulic spiral drilling rig is detachably mounted on the fixed frame. The inlet and return oil pipes of the hydraulic spiral drilling rig are connected to the excavator's hydraulic system, and the output end of the hydraulic spiral drilling rig passes through the fixed frame and connects to the hot-dip galvanized spiral piles. This tracked walking spiral pile drilling rig combines a hydraulic spiral drilling rig with an excavator to meet the construction requirements of hot-dip galvanized spiral piles while significantly reducing construction costs.

[0004] However, the above-mentioned drilling rigs have the following shortcomings when in use: 1. Hydraulic auger drilling rigs mainly rely on the hydraulic system of the excavator for oil supply. When the flow or pressure of the excavator's hydraulic system is insufficient, it will affect the torque and speed of the drilling rig, reduce construction efficiency, and even damage the equipment; moreover, the U-shaped fixing frame relies on bolts and pins, which have poor resistance to torsional vibration and low centering accuracy; 2. When drilling, its verticality control mainly relies on the operator's experience, and the control accuracy of the excavator's boom is limited, making it difficult to ensure the verticality of the pile and the angle of entry into the soil, especially in soft and hard uneven strata where it is easy to deviate; 3. Poor versatility, only suitable for soft soil strata. For hard geological conditions such as municipal concrete roads, rock, and gravel layers, the penetration ability of the auger drill bit is limited, and it is easy to get stuck or damaged. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a rotary drilling drill for road crossing pile construction. It solves the problems of uneven ground and difficulty in ensuring drilling verticality and soil entry angle at road crossings. It is also compatible with various drill bodies with round and hexagonal drill rods for quick replacement and can cover various geological drilling requirements common at road crossings, making it highly versatile.

[0006] The aforementioned rotary drilling rig for road crossing pile construction includes an excavator. Lifting support legs are fixedly connected to the four corners of the excavator. A rotary drilling guide mechanism is rotatably connected to the front end of the excavator. A hydraulic cylinder is rotatably connected between the excavator and the rotary drilling guide mechanism. A telescopic mechanism is provided inside the rotary drilling guide mechanism. A rotary drilling power mechanism is fixedly connected to the telescopic end of the telescopic mechanism. A drill rod fixing mechanism for quick drill body replacement is fixedly connected to the power output end of the rotary drilling power mechanism. The drill rod fixing mechanism is fixedly connected to the drill body.

[0007] Preferably, the lifting support leg is an electric telescopic rod, the fixed end of the lifting support leg is fixedly connected to the chassis of the excavator through an L-shaped support frame, and the telescopic end of the lifting support leg is fixedly connected to a support plate for contacting the ground.

[0008] Preferably, the rotary drilling guide mechanism is located between two lifting support legs at the front end of the excavator. The rotary drilling guide mechanism includes a guide frame with a rectangular structure. A fixed plate is fixedly connected to the side of the guide frame near the excavator. A support seat is fixedly connected to the fixed plate. A rotating shaft is rotatably connected to the support seat near its lower end. A rotating seat is fixedly connected to the chassis of the excavator. The rotating seat is rotatably connected to the rotating shaft. A connecting rod is rotatably connected to the upper part of the support seat. The extended end of the hydraulic cylinder is rotatably connected to the connecting rod.

[0009] Preferably, the telescopic mechanism includes an upper fixed seat, which is fixedly connected to the upper end of the guide frame. At least one lifting cylinder is rotatably connected to the upper fixed seat via a hinge. A sliding rod is rotatably connected to the extended end of the lifting cylinder. A sliding frame is rotatably connected to the sliding rod. Guide wheels are rotatably connected to both ends of the sliding rod and the lower ends of the sliding frame, respectively. Guide grooves that cooperate with the guide wheels are respectively opened on the two inner sides of the guide frame.

[0010] Preferably, a fixed frame is fixedly connected to the sliding frame, a limiting boss is provided at the lower end of the sliding frame, the fixed frame has an L-shaped structure, and a slot corresponding to the limiting boss is opened at the bend of the fixed frame. Multiple reinforcing ribs are fixedly connected to the bottom of the fixed frame, and the reinforcing ribs are fixedly connected to the sliding frame.

[0011] Preferably, the fixing frame has a mounting hole for the drill rod fixing mechanism to pass through, and a bearing that cooperates with the drill rod fixing mechanism is provided in the mounting hole.

[0012] Preferably, the drill pipe fixing mechanism includes an upper limit plate and a lower limit plate arranged vertically, which are fixedly connected by fasteners. A turntable is rotatably connected inside the lower limit plate. A bevel gear plate is provided on the upper part of the turntable, and multiple bevel gears are meshed on the bevel gear plate. A spiral groove is provided on the lower part of the turntable. Multiple equally spaced I-shaped grooves are opened at the bottom of the lower limit plate. An I-shaped clamp is slidably connected inside the I-shaped grooves. An arc-shaped tooth is provided on the upper part of the I-shaped clamp that slides with the spiral groove.

[0013] Preferably, the upper limit plate and the lower limit plate are respectively provided with limit grooves that match the turntable and the bevel gear, the bevel gear is provided with a drive shaft, and the drive shaft is provided with a square hole.

[0014] Preferably, a drill rod is fixedly connected to the upper end of the drill body, and the cross-section of the drill rod is circular or hexagonal.

[0015] Preferably, the clamping end of the I-beam clamp is fixed with a chuck, and the end face of the chuck that contacts the drill rod is provided with an anti-slip groove.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. This utility model uses an excavator as a carrier, which is flexible in relocation. With the help of four sets of lifting support legs, it can quickly level uneven ground such as the track perimeter and roadbed settlement area to avoid tilting of the machine body. At the same time, the support plate increases the ground contact area to prevent the machine from getting stuck in soft soil and backfill areas. The hydraulic cylinder can make fine adjustments to the angle of the rotary drilling guide mechanism, which solves the problem of uneven ground at the road crossing and difficulty in ensuring the verticality of drilling and the angle of entry into the soil.

[0018] 2. The rotary drilling guide mechanism uses a rectangular guide frame with guide wheels to limit the lateral displacement of the sliding frame. The hydraulic cylinder fine-tunes the guide angle to ensure the verticality of the drill body. The dual lifting cylinders precisely control the burial depth through the extension and retraction, meeting the requirements of vertical stability and burial depth of the road crossing piles. The independent reduction motor drive and the dual lifting cylinder propulsion work together to shorten the construction cycle of a single pile, and can efficiently complete the continuous construction of multiple piles at the road crossing, reducing the overall construction period and labor costs.

[0019] 3. The rotary drilling power mechanism is an independent geared motor, which does not rely on the original hydraulic system of the excavator. The torque output is stable, avoiding drill jamming and slippage. The drill rod fixing mechanism uses the cooperation of spiral groove and arc tooth to realize the quick clamping and loosening of the drill body, saving drill changing time. It is also compatible with the quick replacement of various drill bodies, including round and hexagonal drill rods, and can cover a variety of geological conditions commonly found at road crossings, making it more versatile. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a partial structural diagram of the rear of this utility model;

[0022] Figure 3 This is a side view of the structure of this utility model;

[0023] Figure 4 This is a schematic diagram showing the installation of the rotary drilling guide mechanism, telescopic mechanism, and rotary drilling power mechanism;

[0024] Figure 5This is a schematic diagram showing the cooperation between the rotary drilling guide mechanism and the telescopic mechanism.

[0025] Figure 6 This is a schematic diagram showing the fit between the fixed frame and the sliding frame;

[0026] Figure 7 This is a schematic diagram of the telescopic mechanism;

[0027] Figure 8 This is a schematic diagram of the drill body structure;

[0028] Figure 9 This is a schematic diagram of the drill pipe fixing mechanism;

[0029] Figure 10 A breakdown diagram of the drill pipe fixing mechanism;

[0030] Figure 11 This is a schematic diagram of the bottom structure of the turntable;

[0031] Figure 12 This is a schematic diagram of the upper structure of the turntable;

[0032] Figure 13 This is a schematic diagram of the structure of an I-beam clamp.

[0033] In the diagram: 1. Excavator; 101. Hydraulic cylinder; 102. Rotary seat; 2. Lifting support leg; 201. Support plate; 3. Rotary drilling guide mechanism; 301. Guide frame; 302. Fixed plate; 303. Support seat; 304. Rotary shaft; 305. Connecting rod; 306. Guide groove; 4. Telescopic mechanism; 401. Upper fixed seat; 402. Sliding rod; 403. Sliding frame; 4031. Limiting boss; 404. Guide wheel; 405. Lifting... 5. Hydraulic cylinder; 6. Fixing frame; 7. Rotary drilling power mechanism; 8. Drill body; 9. Drill rod; 10. Drill rod fixing mechanism; 11. Upper limit plate; 12. Limiting groove; 13. Bevel gear; 14. Square hole; 15. Turntable; 16. Spiral groove; 17. Bevel gear plate; 18. Lower limit plate; 19. I-beam groove; 20. I-beam clamp; 21. Arc tooth; 22. Chuck; 33. Anti-slip groove; 44. Bearing. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings:

[0035] The directional terms used in the detailed description paragraphs are only for the convenience of those skilled in the art to understand the technical solutions described in this application based on the visual orientation shown in the accompanying drawings. Unless otherwise expressly specified and limited, the terms "setting," "installation," "connection," etc., should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] like Figures 1 to 13 As shown, a rotary drilling rig for road crossing pile construction includes an excavator 1, which serves as the basic carrier for the rotary drilling rig, providing mobility and an installation platform for flexible relocation. Lifting support legs 2 are fixedly connected to the four corners of the excavator 1. These four lifting support legs 2 enhance the overall stability of the machine during construction and can also be used to level uneven ground at the road crossing (such as around the track or in areas of roadbed settlement), preventing tilting during drilling. A rotary drilling guide mechanism 3 is rotatably connected to the front end of the excavator 1. The rotary drilling guide mechanism 3 provides a vertical guide reference for the drill body 7, ensuring the verticality requirements of the road crossing pile. A hydraulic cylinder 101 is rotatably connected between the excavator 1 and the rotary drilling guide mechanism 3. The hydraulic cylinder 101 can finely adjust the verticality of the borehole by extending and retracting to adjust the angle of the rotary drilling guide mechanism 3. The rotary drilling guide mechanism 3 is equipped with a telescopic mechanism 4, which drives the rotary drilling power mechanism 6 and the drill body 7 to move up and down, precisely controlling the burial depth of the road crossing pile hole. The telescopic end of the telescopic mechanism 4 is fixedly connected to the rotary drilling power mechanism 6, which is a geared motor. The power output end of the rotary drilling power mechanism 6 is fixedly connected to a drill rod fixing mechanism 8 for quick replacement of the drill body 7. The drill rod fixing mechanism 8 is fixedly connected to the drill body 7. The rotary drilling power mechanism 6 is used to output torque to drive the drill body 7 to cut the soil; and it does not rely on the original hydraulic system of the excavator 1, so the power output is more stable. The drill body 7 directly completes the pile hole drilling, providing hole positions for subsequent road crossing pile installation. Different drill bodies 7 can be replaced according to different geological conditions. The drill rod fixing mechanism 8 is used to realize the quick replacement of the drill body 7 to adapt to the complex strata of the road crossing.

[0037] In this embodiment, the lifting support leg 2 is an electrically telescopic rod. The length of the electric telescopic rod can be precisely adjusted via electrical control to adapt to different ground elevations at the crossing. The fixed end of the lifting support leg 2 is fixedly connected to the chassis of the excavator 1 via an L-shaped support frame. The L-shaped support frame is welded from high-strength steel to enhance the connection strength between the support leg and the chassis of the excavator 1. The telescopic end of the lifting support leg 2 is fixedly connected to a support plate 201 for contact with the ground. The support plate 201 is a rectangular steel plate used to increase the contact area with the ground, reduce the ground pressure, and prevent the machine from getting stuck in soft soil foundations or backfilled areas at the crossing.

[0038] The rotary drilling guide mechanism 3 is located between the two lifting support legs 2 at the front end of the excavator 1. This avoids interference with the support structure of the lifting support legs 2, while utilizing the stable area of ​​the support legs to ensure guiding accuracy. Figure 3As shown, the rotary drilling guide mechanism 3 includes a rectangular guide frame 301, which is welded from steel profiles and provides a vertical guide rail for the telescopic mechanism 4, controlling the verticality of the borehole from the source. A fixed plate 302 is fixedly connected to the side of the guide frame 301 near the excavator 1, and a support seat 303 is fixed on the fixed plate 302. The fixed plate 302 and the support seat 303 form a rigid connection unit to transmit the thrust and pull of the hydraulic cylinder 101 and prevent the guide frame 301 from shaking. A rotating shaft 304 is rotatably connected to the support seat 303 near its lower end. A rotating seat 102 is fixedly connected to the chassis of the excavator 1. The rotating seat 102 is rotatably connected to the rotating shaft 304, allowing the guide frame 301 to be finely adjusted around the rotating shaft 304. A connecting rod 305 is rotatably connected to the upper part of the support seat 303, and the extended end of the hydraulic cylinder 101 is rotatably connected to the connecting rod 305. The hydraulic cylinder 101 pushes the support seat 303 through the connecting rod 305 to adjust the angle of the guide frame 301, so as to correct the drilling deviation caused by the ground tilt and ensure that the road crossing pile hole is perpendicular to the road surface.

[0039] like Figure 7 As shown, the telescopic mechanism 4 includes an upper fixed seat 401, which is fixedly connected to the upper end of the guide frame 301. The upper fixed seat 401 provides a fixed fulcrum for the lifting cylinder 405 to ensure stable power output. At least one lifting cylinder 405 is rotatably connected to the upper fixed seat 401 via a hinge seat. In this embodiment, there are two lifting cylinders 405. The two lifting cylinders 405 provide sufficient axial power for the telescopic mechanism 4 to adapt to the burial depth requirements of the road crossing pile. A sliding rod 402 is rotatably connected to the extended end of the lifting cylinder 405. A sliding frame 403 is rotatably connected to the sliding rod 402. The sliding frame 403 is used to drive the rotary drilling power mechanism 6 and the drill body 7 to slide. Guide wheels 404 are rotatably connected to both ends of the sliding rod 402 and the lower ends of the sliding frame 403, respectively. Guide grooves 306 that cooperate with the guide wheels 404 are respectively opened on the two inner sides of the guide frame 301. During use, the guide wheel 404 rolls along the guide groove 306, converting sliding friction into rolling friction, reducing wear on the mechanism, and limiting the lateral displacement of the sliding frame 403 to ensure that the drill body 7 drills vertically.

[0040] like Figure 6As shown, a fixed frame 5 is fixedly connected to the sliding frame 403. The fixed frame 5 is used to connect the sliding frame 403 and the rotary drilling power mechanism 6. The lower end of the sliding frame 403 is provided with a limiting boss 4031. The fixed frame 5 has an L-shaped structure, which facilitates the installation of the rotary drilling power mechanism 6 and avoids interference between the rotary drilling power mechanism 6 and the guide frame 301. Furthermore, the corner of the fixed frame 5 is provided with a slot corresponding to the limiting boss 4031. The limiting boss 4031 and the slot cooperate to facilitate precise positioning of the fixed frame 5 and prevent installation misalignment that could cause the drill body 7 to tilt. Multiple reinforcing ribs are fixedly connected to the bottom of the fixed frame 5. The reinforcing ribs are fixedly connected to the sliding frame 403. The reinforcing ribs enhance the connection strength between the fixed frame 5 and the sliding frame 403, resist the torque during drilling, prevent the fixed frame 5 from deforming, and ensure stable power transmission.

[0041] The mounting frame 5 has an installation hole for the drill rod fixing mechanism 8 to pass through. The installation hole provides a rotation channel for the drill rod fixing mechanism 8, ensuring that it can rotate synchronously with the rotary drilling power mechanism 6. The installation hole is equipped with a bearing 9 that cooperates with the drill rod fixing mechanism 8. The bearing 9 is preferably a deep groove ball bearing, which can withstand radial force and resist lateral vibration during drilling of the drill body 7. At the same time, it reduces the rotational friction of the drill rod fixing mechanism 8, ensures smooth rotation of the drill body 7, and avoids torque loss due to excessive friction.

[0042] like Figures 9 to 13 As shown, the drill pipe fixing mechanism 8 includes an upper limit plate 801 and a lower limit plate 806 arranged vertically. The upper limit plate 801 and the lower limit plate 806 are fixedly connected by fasteners such as high-strength bolts to form a closed shell, providing installation and limiting space for internal components. A turntable 805 is rotatably connected inside the lower limit plate 806. The turntable 805 can rotate around its center. A bevel gear plate 8052 is provided on the upper part of the turntable 805. Three or four bevel gears 803 are meshed on the bevel gear plate 8052. Driving the bevel gears 803 can evenly transmit torque to the turntable 805. A spiral groove 8051 is provided on the lower part of the turntable 805. Multiple equally spaced I-shaped grooves 807 are opened on the bottom of the lower limit plate 806. An I-shaped clamp 808 is slidably connected inside the I-shaped grooves 807. An arc-shaped tooth 8081 that slides with the spiral groove 8051 is provided on the upper part of the I-shaped clamp 808. The spiral groove 8051 and the arc-shaped tooth 8081 cooperate, and when the turntable 805 rotates, it drives the I-beam clamp 808 to move radially and synchronously along the I-beam groove 807, realizing the rapid clamping or loosening of the drill rod 701, which is suitable for the need to change drills in multiple strata during roadway pile construction. At the same time, the cooperation between the spiral groove 8051 and the arc-shaped tooth 8081 has a self-locking function, which can effectively prevent the I-beam clamp 808 from moving in the opposite direction. The I-beam groove 807 restricts the I-beam clamp 808 to move only radially, avoiding clamping offset and ensuring the coaxiality of the drill rod 701.

[0043] The upper limit plate 801 and the lower limit plate 806 are respectively provided with limiting grooves 802 that match the turntable 805 and the bevel gear 803. The limiting grooves 802 axially limit the turntable 805 and the bevel gear 803 to prevent the components from shifting during rotation and ensure transmission accuracy. The bevel gear 803 is provided with a drive shaft. By driving the drive shaft, the bevel gear 803 can be driven to rotate, so that the bevel gear 803 drives the turntable 805 to rotate. The drive shaft is provided with a square hole 804. The square hole 804 facilitates the mating with a square shaft, avoids slippage during power transmission, and ensures efficient transmission of clamping torque.

[0044] like Figure 8 As shown, a drill rod 701 is fixedly connected to the upper end of the drill body 7. The drill rod 701 is used to connect with the drill rod fixing mechanism 8 to transmit torque and axial pressure. The cross-section of the drill rod 701 is circular or hexagonal. The circular cross-section is suitable for general clamping scenarios, has low processing costs, and is suitable for soft soil strata when combined with the auger drill body; the hexagonal cross-section can enhance the engagement with the clamp, and is suitable for use with... Figure 8 The drill bit shown is suitable for hard geological conditions such as concrete roads, rock, and gravel layers.

[0045] During processing, three I-beam clamps 808 are preferred. The clamping end of the I-beam clamp 808 is fixed with a chuck 8082. The front end of the chuck 8082 has a large arc structure, which makes it compatible with both round and hexagonal drill rods 701. The chuck 8082 is made of wear-resistant alloy material. When in use, it fits against the side of the drill rod 701 to effectively prevent the drill rod 701 from loosening. The end face of the chuck 8082 that contacts the drill rod 701 is provided with an anti-slip groove 8083. The anti-slip groove 8083 increases the friction of the contact surface. At the same time, it further prevents the drill rod 701 from slipping during high torque drilling, ensuring that the power is effectively transmitted to the drill body 7 and ensuring the drilling efficiency of the roadway pile hole.

[0046] Working principle:

[0047] During use, the excavator 1 can be flexibly moved and precisely parked at the preset pile hole position. At this time, the lifting support legs 2 are in the retracted state, which does not affect the movement of the equipment. When drilling is required, the lifting support legs 2 are activated, and the extension length of the four sets of support legs is adjusted by electronic control so that the support plate 201 at the extension end is evenly in contact with the ground. The weight of the whole machine is distributed by the four corner supports, and at the same time, the uneven ground at the roadway is corrected to prevent the machine body from tilting, so as to provide a stable foundation for subsequent drilling.

[0048] Select a suitable drill body 7 according to the geological characteristics of the tunnel crossing. Insert the drill rod 701 at the upper end of the drill body 7 into the center of the drill rod fixing mechanism 8. Simultaneously, insert a wrench with a square shaft into the square hole 804 and rotate the wrench to drive the bevel gear 803 to rotate. The bevel gear 803 meshes with the bevel gear disc 8052 on the upper part of the turntable 805, driving the turntable 805 to rotate around the center. The spiral groove 8051 at the lower part of the turntable 805 slides into the arc-shaped teeth 8081 on the upper part of the I-beam clamp 808, causing the three sets of I-beam clamps 808 to retract radially along the I-beam groove 807 of the lower limit plate 806, so that the chuck 8082 fits tightly against the side of the drill rod 701, completing the rapid fixing of the drill body 7. Reversing the wrench can loosen the I-beam clamp 808 and replace it with another drill body 7. The engagement between the spiral groove 8051 and the arc-shaped teeth 8081 has a self-locking function to prevent the clamps from loosening during drilling.

[0049] Start the hydraulic cylinder 101. The extended end of the hydraulic cylinder 101 pushes the connecting rod 305, causing the support seat 303 to rotate around the rotating shaft 304, thereby adjusting the tilt angle of the rectangular guide frame 301. By finely adjusting the angle of the guide frame 301, the drilling deviation caused by the ground slope is corrected, ensuring that the telescopic mechanism 4 inside the guide frame 301 always remains vertical, providing a vertical guiding reference for the drill body 7.

[0050] During drilling, the rotary drilling power mechanism 6 is activated, and its output torque is transmitted to the drill body 7 through the drill rod fixing mechanism 8, driving the drill body 7 to rotate and cut the soil. Simultaneously, the double lifting cylinders 405 of the telescopic mechanism 4 are activated. The cylinders extend, pushing the sliding rod 402 and sliding frame 403 downwards. The guide wheels 404 at both ends of the sliding frame 403 roll along the guide grooves 306 of the guide frame 301, ensuring the drill body 7 drills vertically. The extension and retraction of the lifting cylinders 405 precisely controls the lowering depth of the drill body 7, adapting to the design burial depth requirement of 0.6-1.2m for roadbed piles. When the design depth is reached, the lifting cylinders 405 retract, lifting the drill body 7 to complete the drilling of a single pile hole. The retraction of the lifting cylinders 405 causes the drill body 7 to rise and reset.

[0051] Finally, although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A rotary excavating drill for construction of a crossing pile, comprising an excavator (1), characterized in that: The excavator (1) is fixedly connected to lifting support legs (2) at the four corners. The front end of the excavator (1) is rotatably connected to a rotary drilling guide mechanism (3). A hydraulic cylinder (101) is rotatably connected between the excavator (1) and the rotary drilling guide mechanism (3). The rotary drilling guide mechanism (3) is equipped with a telescopic mechanism (4). The telescopic end of the telescopic mechanism (4) is fixedly connected to a rotary drilling power mechanism (6). The power output end of the rotary drilling power mechanism (6) is fixedly connected to a drill rod fixing mechanism (8) for quick replacement of the drill body (7). The drill rod fixing mechanism (8) is fixedly connected to the drill body (7).

2. The rotary excavating drill for construction of a crossing pile according to claim 1, characterized in that: The lifting support leg (2) is an electric telescopic rod. The fixed end of the lifting support leg (2) is fixedly connected to the chassis of the excavator (1) through an L-shaped support frame. The telescopic end of the lifting support leg (2) is fixedly connected to a support plate (201) for contacting the ground.

3. The rotary excavating drill for construction of a crossing pile according to claim 1, characterized in that: The rotary drilling guide mechanism (3) is located between two lifting support legs (2) at the front end of the excavator (1). The rotary drilling guide mechanism (3) includes a guide frame (301) with a rectangular structure. A fixed plate (302) is fixedly connected to the side of the guide frame (301) near the excavator (1). A support seat (303) is fixed on the fixed plate (302). A rotating shaft (304) is rotatably connected to the support seat (303) near its lower end. A rotating seat (102) is fixedly connected to the chassis of the excavator (1). The rotating seat (102) is rotatably connected to the rotating shaft (304). A connecting rod (305) is rotatably connected to the upper part of the support seat (303). The extended end of the hydraulic cylinder (101) is rotatably connected to the connecting rod (305).

4. The rotary excavating drill for construction of a crossing pile according to claim 3, characterized in that: The telescopic mechanism (4) includes an upper fixed seat (401), which is fixedly connected to the upper end of the guide frame (301). At least one lifting cylinder (405) is rotatably connected to the upper fixed seat (401) via a hinge seat. A sliding rod (402) is rotatably connected to the extended end of the lifting cylinder (405). A sliding frame (403) is rotatably connected to the sliding rod (402). Guide wheels (404) are rotatably connected to both ends of the sliding rod (402) and the lower ends of the sliding frame (403). Guide grooves (306) that cooperate with the guide wheels (404) are respectively opened on the two inner sides of the guide frame (301).

5. A rotary drilling rig for road crossing pile construction according to claim 4, characterized in that: A fixed frame (5) is fixedly connected to the sliding frame (403). The lower end of the sliding frame (403) is provided with a limiting boss (4031). The fixed frame (5) has an L-shaped structure, and a slot corresponding to the limiting boss (4031) is opened at the bend of the fixed frame (5). Multiple reinforcing ribs are fixedly connected to the bottom of the fixed frame (5), and the reinforcing ribs are fixedly connected to the sliding frame (403).

6. The rotary excavating drill for construction of a crossing pile according to claim 5, characterized in that: The fixing frame (5) has an installation hole for the drill rod fixing mechanism (8) to pass through, and a bearing (9) that cooperates with the drill rod fixing mechanism (8) is provided in the installation hole.

7. The rotary excavating drill for construction of a crossing stake according to any one of claims 1 to 6, characterized in that: The drill pipe fixing mechanism (8) includes an upper limit plate (801) and a lower limit plate (806) arranged vertically. The upper limit plate (801) and the lower limit plate (806) are fixedly connected by fasteners. A turntable (805) is rotatably connected inside the lower limit plate (806). A bevel gear plate (8052) is provided on the upper part of the turntable (805). Multiple bevel gears (803) are meshed on the bevel gear plate (8052). A spiral groove (8051) is provided on the lower part of the turntable (805). Multiple I-shaped grooves (807) are provided at equal intervals at the bottom of the lower limit plate (806). An I-shaped clamp (808) is slidably connected inside the I-shaped groove (807). An arc-shaped tooth (8081) is provided on the upper part of the I-shaped clamp (808) and slides with the spiral groove (8051).

8. The rotary excavating drill for construction of a crossing pile according to claim 7, characterized in that: The upper limit plate (801) and the lower limit plate (806) are respectively provided with limit grooves (802) that match the turntable (805) and the bevel gear (803). The bevel gear (803) is provided with a drive shaft, and a square hole (804) is provided in the drive shaft.

9. The rotary excavating drill for construction of a crossing stake according to claim 7, characterized in that: The upper end of the drill body (7) is fixedly connected to a drill rod (701), and the cross-section of the drill rod (701) is circular or hexagonal.

10. The rotary excavating drill for construction of a crossing pile according to claim 9, characterized in that: The clamping end of the I-beam clamp (808) is fixed with a chuck (8082), and the end face of the chuck (8082) that is in contact with the drill rod (701) is provided with an anti-slip groove (8083).

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