Pile driver for road and bridge construction and using method thereof

Abstract

The invention belongs to the technical field of piling machinery, and relates to a pile driver for road and bridge construction and a using method thereof.The pile driver for road and bridge construction comprises a moving trolley and a pile driving frame installed at the end of the moving trolley, a high-pressure rotary power head is installed on the pile driving frame, and a drill rod assembly is installed on the high-pressure rotary power head; the drill rod assembly comprises a first drill rod assembly, a second drill rod assembly and a third drill rod assembly, and the first drill rod assembly comprises a first outer sleeve, a pressing guide pipe, a rotary drainage pipe and a first hollow pipe which are sleeved together from outside to inside. The advantages of rotary drilling rig equipment and drilling equipment special for hard rock stratums are combined, one piece of equipment can be conveniently used for conducting drilling construction operation mode switching, the technical problem that the same drilling equipment is used for completing two kinds of drilling construction operation in different stratum structures is effectively solved, the construction efficiency is improved, and the construction cost is reduced. And the construction cost is greatly reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of pile-driving machinery, and in particular relates to a pile driver for road and bridge construction and a use method thereof. Background Art

[0002] Rotary drilling rigs have been widely promoted for their many advantages such as low noise, low vibration, fast drilling speed, easy movement and positioning within the construction site, and small construction area. They are especially used in municipal engineering projects and highways with tight construction schedules and scattered bridges. However, for hard rock formations, if the rotary drilling rig of the existing technology is used for forced drilling, not only the drilling speed is slow, the drill tool wears quickly, and the mechanical equipment is greatly damaged, but also mechanical accidents such as drill rod splitting are prone to occur. Therefore, it is necessary to replace it with drilling equipment specifically for hard rock formations. In the actual pile foundation hole construction process, more than two different formation structures are often encountered. Therefore, the construction party needs to adopt a suitable drilling process according to the characteristics of the formation. Since the rotary drilling rig and other drilling equipment specifically for hard rock formations in the existing technology are very different in structural composition, the two drill bits cannot be installed and used interchangeably on one device. Therefore, the same device cannot be used to complete two construction operations successively, but only two different devices can be used for construction separately. This not only increases the purchase, maintenance, and transportation costs of the equipment, but when encountering a relatively narrow working environment, the two devices are installed and constructed alternately, which not only reduces the construction efficiency, but also increases the construction cost. Therefore, how to improve the existing rotary drilling rig so that it can be applicable to drilling construction operations in various formations including hard rock formations is still a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0003] In view of the technical problem that the rotary drilling rig in the prior art and the drilling equipment specifically for hard rock formations described in the background technology are very different in structural composition, and the same equipment cannot be used to complete both construction operations, which affects the efficiency of piling and drilling construction and increases construction costs. The present invention provides a pile driver for road and bridge construction and a method for using the same. By using one pile driving equipment, the pile driver drill bit can be switched at any time when encountering various different stratum structures to adapt to different drilling process requirements, avoid the situation where the construction progress is affected by frequent replacement of drilling equipment, improve construction efficiency, and reduce construction costs.

[0004] The present invention achieves the above-mentioned invention object through the following technical scheme: a pile driver for road and bridge construction, comprising a mobile vehicle and a pile driving frame installed at the end of the mobile vehicle, the pile driving frame is installed with a high-pressure rotary power head, and the high-pressure rotary power head is installed with a drill rod assembly, the drill rod assembly comprises a first drill rod assembly, a second drill rod assembly, and a third drill rod assembly; the first drill rod assembly comprises a first outer sleeve, a pressing guide pipe, a rotating drainage pipe, and a first hollow pipe which are sleeved together from the outside to the inside; the second drill rod assembly comprises a second outer sleeve and a second hollow pipe which are sleeved together from the outside to the inside; the third drill rod assembly comprises a third outer sleeve and a third hollow pipe which are sleeved together from the outside to the inside; the lower end of the first outer sleeve is relatively rotatably connected to the upper end of the second outer sleeve, the lower end of the second outer sleeve is fixedly connected to the upper end of the third outer sleeve, and the first hollow pipe, the second hollow pipe, and the third hollow pipe are fixedly connected in sequence from top to bottom; A slide rail is fixed on the pile driving frame, a first slide seat and a second slide seat are installed on the slide rail, the high-pressure rotary power head is installed on the first slide seat, the second outer sleeve passes through and is fixed on the high-pressure rotary power head; the second slide seat is fixedly connected to the outer surface of the first outer sleeve; A rock drill bit is fixedly connected to the lower end of the third hollow tube, an external spline sleeve is fixedly installed on the outer wall of the third hollow tube above the rock drill bit, a spline groove is provided on the inner wall of the lower end of the third outer sleeve, the external spline sleeve is matched and connected with the spline groove, and a mounting hole for hanging the rotary drilling bit is also provided at the lower end of the third outer sleeve; A lower support ring is fixedly provided on the inner tube wall of the third outer sleeve, an upper support ring is fixedly provided on the outer tube wall of the third hollow tube, and a compression spring is installed between the lower support ring and the upper support ring; The inner cavity wall of the first outer sleeve is provided with evenly distributed guide grooves, partitions are provided between adjacent guide grooves, and arc-shaped teeth are provided at the end of the partition, the guide grooves are divided into deep guide grooves and shallow guide grooves, the deep guide grooves and the shallow guide grooves are arranged at intervals, the bottom end of the shallow guide grooves is also provided with arc-shaped teeth, and the arc-shaped teeth on the shallow guide grooves are connected to the arc-shaped teeth at the end of the partition; the outer side surface of the pressing guide tube is evenly provided with guide strips, the guide strips on the pressing guide tube are slidably matched with the guide grooves of the first outer sleeve, and guide teeth are provided at the bottom end of the pressing guide tube; the bottom end of the outer surface of the rotating drainage tube is provided with evenly distributed bar-shaped tooth blocks, and the upper part of the rotating drainage tube is provided with an outer conduit, one end of the outer conduit is connected to the inner conduit of the rotating drainage tube, and the other end of the outer conduit is connected to the air supply pipe of the air compressor, and the inner conduit of the rotating drainage tube is in close contact with the top end of the first hollow tube; A cylinder is fixedly mounted on the outer tube wall of the first outer sleeve, and a piston rod of the cylinder is fixedly connected to press the outer tube wall of the guide tube.

[0005] Furthermore, when the piston rod of the cylinder retracts, the pressing guide tube is pulled downward relative to the first outer sleeve, and the strip tooth block on the outer surface of the rotating drainage tube is pressed downward by the guide teeth on the pressing guide tube until the strip tooth block moves down to below the arc-shaped teeth at the partition end of the first outer sleeve, and then the piston rod of the cylinder is reset, and under the elastic force of the compression spring, the third hollow tube pushes the second hollow tube and the first hollow tube to move upward, and the first hollow tube pushes the rotating drainage tube in contact with it to move upward. At this time, the strip tooth block moves upward with the rotating drainage tube and produces the following two working positions of the drill rod assembly. The first working position state: the strip tooth block is guided by the arc-shaped teeth at the partition end to enter the deep guide groove and slide a large distance, so that the rotating drainage tube moves a long distance inside the pressing guide tube, thereby causing the first hollow tube inside the rotating drainage tube to follow and move up a large distance. At this time, the second hollow tube and the third hollow tube The hollow tube follows the first hollow tube to move upward, and drives the rock drill bit connected to the third hollow tube to retract into the third outer casing, meeting the need of the third outer casing to connect the rotary drilling bit; second working position state: the strip tooth block is guided by the arc-shaped teeth at the end of the partition into the lower part of the arc-shaped teeth at the end of the shallow guide groove, and stays at the arc top of the arc-shaped teeth at the end of the shallow guide groove, so that the rotating drainage tube moves a short distance inside the pressing guide tube, and the first hollow tube inside the rotating drainage tube follows and moves upward a small distance. At this time, the second hollow tube and the third hollow tube follow the first hollow tube to move upward, and drive the rock drill bit connected to the third hollow tube to move a short distance and then be fixed outside the third outer casing, meeting the need of the rock drill bit to drill holes in hard rock formations; the above two working position states are alternately realized with the contraction and resetting of the piston rod, meeting the need of the drilling rig to switch drilling operation modes to adapt to different geological structures.

[0006] Furthermore, a bearing box end cover is fixed to the lower end of the first outer sleeve, a round nut is fixed to the upper end of the second outer sleeve, a thrust bearing is installed at the lower part of the round nut, and a bearing box body is installed outside the thrust bearing. The bearing box body and the bearing box end cover are fixedly connected by bolts; the round nut and the second outer sleeve are fixedly connected by threads and a first flat key.

[0007] Furthermore, a radial ball bearing is installed inside the bottom end of the rotating drainage tube, and the first hollow tube is inserted into the radial ball bearing.

[0008] Furthermore, a sealing ring is provided at the contact surface between the first hollow tube and the inner cavity of the rotary drainage tube.

[0009] Furthermore, a support slip ring is provided between the second hollow tube and the second outer sleeve, the support slip ring is fixed on the tube wall of the second hollow tube, and the outer surface of the support slip ring is slidably matched with the inner surface of the second outer sleeve.

[0010] Furthermore, the second drill rod assembly includes at least one second outer sleeve and at least one second hollow tube, the lower end of the second outer sleeve is connected to the upper end of the third outer sleeve by a thread or a flange, and the lower end of the second hollow tube is connected to the upper end of the third hollow tube by a thread or a flange.

[0011] Furthermore, the second outer sleeve has multiple sections, and the second hollow tube also has multiple sections. The number of the second outer sleeves is the same as the number of the second hollow tubes, and the length of each section of the second outer sleeve is the same as the length of the second hollow tube inside it. Adjacent second outer sleeves are connected by threads or flanges, and adjacent second hollow tubes are also connected by threads or flanges.

[0012] Furthermore, the rock drill bit is a common alloy drill bit or an impact drill bit with an impactor.

[0013] As an optimization, a double helical blade is spirally wrapped around the outer surface of the third outer sleeve, and a plurality of bullet-shaped pick teeth are arranged on the edge of the double helical blade.

[0014] Furthermore, the rotary drilling bit is a spiral drill bit or a rotary drilling bucket.

[0015] Furthermore, a transition joint is also included, the upper end of which is connected to the lower end of the third outer sleeve through a pin shaft, and the lower end of the transition joint is connected to the rotary drilling bit.

[0016] The present invention also provides a method for using a pile driver for road and bridge construction, comprising the following working steps: S1. Keep the drill rod assembly in the first working position, retract the rock drill bit into the third outer casing, connect a suitable rotary drill bit to the third outer casing, and drive the rotary drill bit to drill holes in the upper soft soil under the drive of the high-pressure rotary power head; S2. When drilling into a hard rock formation, the rotary drill bit is difficult to continue to drill a hole, so the rotary drill bit is removed and the drill rod assembly is kept in the second working position. At this time, the rock drill bit is fixed outside the third outer casing. The rock drill bit drills a hole in the hard rock formation under the drive of the high-pressure rotary power head. The air compressor is turned on to supply high-pressure air to the rock drill bit to meet the needs of cooling the rock drill bit and discharging rock debris near the rock drill bit. S3. When the rock debris generated by the rock drill bit is too much to be discharged in time, or when encountering a relatively soft formation, turn off the air compressor, switch the drill rod assembly from the second working position to the first working position, install the rotary drilling bit, use the rotary drilling bit to clean the rock debris and expand the hole in time, or drill in the soft formation; S4. According to the formation conditions and rock debris discharge conditions encountered during drilling, the working state of the drill pipe assembly shall be switched in time, and appropriate types of rock drill bits and rotary drilling bits shall be used as needed until the designed drilling depth requirement is reached.

[0017] Furthermore, in S1, a steel pipe sleeve and a lifting device are provided. After the rotary drill bit drills a hole to a certain depth, the operator uses the lifting device to lift the steel pipe sleeve into the pile hole, and continues to use the rotary drill bit to drill downward.

[0018] Beneficial Effects 1. The pile driver for road and bridge construction of the present invention and the method of using the same effectively combine the advantages of rotary drilling rig equipment and drilling equipment specifically for hard rock formations, and transform the existing rotary drilling rig equipment. It is very convenient to use one device to switch the drilling construction mode, and adopt appropriate drilling technology according to the characteristics of different stratum structures, which effectively solves the technical problem of using the same drilling equipment to complete two drilling construction operations in two different stratum structures in succession. It not only reduces the purchase, maintenance and transportation costs of the equipment, but also avoids the situation where the construction progress is affected by frequent replacement of drilling equipment, thereby improving construction efficiency and greatly reducing construction costs.

[0019] 2. The setting of the compression spring ensures that the top end of the first hollow tube is always tightly pressed against the inner conduit of the rotating drainage tube, preventing the high-pressure air of the air compressor from leaking between the inner conduit of the rotating drainage tube and the top end of the first hollow tube, thereby ensuring that all the high-pressure air is delivered to the rock drilling bit; on the other hand, the compression spring cooperates with the cylinder to complete the work position state switching of the drill rod assembly.

[0020] 3. The relative rotation connection structure between the first outer sleeve and the second outer sleeve is conducive to preventing the first outer sleeve from rotating at high speed following the second outer sleeve. Since the second slide seat is fixedly connected to the outer surface of the first outer sleeve, the first outer sleeve can be kept relatively still, thereby ensuring the stability of the air supply duct connection.

[0021] 4. The setting of the radial ball bearing can prevent the rotary drainage tube from rotating at high speed following the first hollow tube. Since the upper part of the rotary drainage tube is connected to the air supply tube through the external conduit, keeping the rotary drainage tube stationary or rotating at a low speed will be beneficial to the stable air supply of the air supply tube.

[0022] 5. The provision of the supporting slip ring is conducive to ensuring that the relative position of the second hollow tube and the second outer sleeve remains stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of a drilling operation of a drilling rig using a rotary drill bit in Example 1 of the present invention; Figure 2 This is a schematic diagram of a drilling operation of a drilling rig using a rock drill bit in Example 1 of the present invention; Figure 3 This is a schematic diagram of the drill rod assembly in Embodiment 1 of the present invention in the first working position; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the drill rod assembly in Embodiment 1 of the present invention in the second working position; Figure 6 This is a schematic diagram of a first drill rod assembly in Example 1 of the present invention; Figure 7 for Figure 6 Enlarged view of point B in the middle; Figure 8 This is a schematic diagram of the third drill rod assembly in the first working position in Example 1 of the present invention; Fig. 9 This is a schematic diagram of the third drill rod assembly in the second working position in Example 1 of the present invention; Fig.10 This is a schematic diagram of the structure of the first outer sleeve in Example 1 of the present invention; Fig.11 for Fig.10 Middle CC section view; Fig.12 This is a schematic diagram of the structure of the pressing guide tube in Example 1 of the present invention; Fig.13 This is a schematic diagram of the structure of the rotary drainage tube in Example 1 of the present invention; Fig.14 This is a schematic diagram of the transition joint structure in Example 1 of the present invention; In the figure: 1, mobile vehicle, 10, pile frame, 100, slide rail, 101, first slide seat, 102, second slide seat, 11, high-pressure rotary power head, 12, drill pipe assembly, 2, first drill pipe assembly, 20, first outer sleeve, 200, guide groove, 201, partition, 202, arc teeth, 203, deep guide groove, 204, shallow guide groove, 21, press guide tube, 210, guide strip, 211, guide teeth, 220, bar tooth block, 22, rotary drainage tube, 221, outer guide tube, 222, inner guide tube, 23, first hollow tube, 24, bearing box end cover, 25, radial ball bearing, 26, seal Sealing ring, 3, second drill pipe assembly, 30, second outer sleeve, 31, second hollow tube, 32, round nut, 33, thrust bearing, 34, bearing housing, 35, first flat key, 36, support slip ring, 4, third drill pipe assembly, 40, third outer sleeve, 41, third hollow tube, 42, rock drill bit, 43, external spline sleeve, 44, spline groove, 45, rotary drill bit, 46, mounting hole, 47, lower support ring, 48, upper support ring, 49, double helical blades, 490, bullet head pick, 5, compression spring, 6, air compressor, 61, air supply pipe, 7, cylinder, 70, piston rod, 8, transition joint. DETAILED DESCRIPTION

[0024] To illustrate the features of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0025] Example 1, please check Figures 1 to 14 A pile driver for road and bridge construction according to embodiment 1 of the present invention comprises a mobile vehicle 1 and a pile driver frame 10 installed at the end of the mobile vehicle 1, a high-pressure rotary power head 11 is installed on the pile driver frame 10, a drill rod assembly 12 is installed on the high-pressure rotary power head 11, and the drill rod assembly 12 comprises a first drill rod assembly 2, a second drill rod assembly 3, and a third drill rod assembly 4; the first drill rod assembly 2 comprises a first outer sleeve 20, a pressing guide pipe 21, a rotating drainage pipe 22, and a first hollow Tube 23; the second drill rod assembly 3 includes a second outer sleeve 30 and a second hollow tube 31 which are fitted together from the outside to the inside; the third drill rod assembly 4 includes a third outer sleeve 40 and a third hollow tube 41 which are fitted together from the outside to the inside; the lower end of the first outer sleeve 20 is connected to the upper end of the second outer sleeve 30 for relative rotation, the lower end of the second outer sleeve 30 is fixedly connected to the upper end of the third outer sleeve 40, and the first hollow tube 23, the second hollow tube 31, and the third hollow tube 41 are fixedly connected in sequence from top to bottom.

[0026] Please inquire Figure 1 , Figure 2 A slide rail 100 is fixed on the pile driving frame 10, and a first slide seat 101 and a second slide seat 102 are installed on the slide rail 100. The high-pressure rotary power head 11 is installed on the first slide seat 101, and the second outer sleeve 30 passes through and is fixed on the high-pressure rotary power head 11; the second slide seat 102 is fixedly connected to the outer surface of the first outer sleeve 20.

[0027] Please inquire Figure 3 , Figure 4 , Figure 5 , Figure 8 ,as well as Fig. 9 A rock drill bit 42 is fixedly connected to the lower end of the third hollow tube 41, an external spline sleeve 43 is fixedly installed on the outer wall of the third hollow tube 41 above the rock drill bit 42, a spline groove 44 is provided on the inner wall of the lower end of the third outer sleeve 40, the external spline sleeve 43 is matched and connected with the spline groove 44, and a mounting hole 46 for hanging a rotary drilling bit 45 is also provided at the lower end of the third outer sleeve 40; A lower support ring 47 is fixedly provided on the inner tube wall of the third outer sleeve 40 , an upper support ring 48 is fixedly provided on the outer tube wall of the third hollow tube 41 , and a compression spring 5 is installed between the lower support ring 47 and the upper support ring 48 .

[0028] Please inquire Figure 6 , Figure 7 , Fig.10 , Fig.11 , Fig.12 ,as well as Fig.13The inner cavity wall of the first outer sleeve 20 is provided with uniformly distributed guide grooves 200, and partitions 201 are provided between adjacent guide grooves 200. The ends of the partitions 201 are provided with arc-shaped teeth 202. The guide grooves 200 are divided into deep guide grooves 203 and shallow guide grooves 204. The deep guide grooves 203 and the shallow guide grooves 204 are arranged at intervals. The bottom of the shallow guide grooves 204 is also provided with arc-shaped teeth 202, and the arc-shaped teeth 202 on the shallow guide grooves 204 are connected to the arc-shaped teeth 202 at the ends of the partitions 201; the outer side surface of the pressing guide tube 21 is uniformly provided with guide strips 210 The guide strip 210 on the pressing guide tube 21 is slidably matched with the guide groove 200 of the first outer sleeve 20, and a guide tooth 211 is provided at the bottom end of the pressing guide tube 21; the bottom end of the outer surface of the rotary drainage tube 22 is provided with a uniformly distributed strip-shaped tooth block 220, and the upper part of the rotary drainage tube 22 is provided with an outer conduit 221, one end of the outer conduit 221 is connected to the inner conduit 222 of the rotary drainage tube 22, and the other end of the outer conduit 221 is connected to the air supply pipe 61 of the air compressor 6, and the inner conduit 222 of the rotary drainage tube 22 is closely connected to the top of the first hollow tube 23; A cylinder 7 is fixedly mounted on the outer tube wall of the first outer sleeve 20 , and a piston rod 70 of the cylinder 7 is fixedly connected to press the outer tube wall of the guide tube 21 .

[0029] The lower end of the second outer sleeve 30 is fixedly connected to the upper end of the third outer sleeve 40, and the high-pressure rotary power head 11 transmits torque and drilling pressure to the rotary drill bit 45 through the second outer sleeve 30 and the third outer sleeve 40. The three hollow tubes are fixedly connected respectively, and are used as high-pressure air supply channels for the rock drill bit 42, and at the same time, apply drilling pressure to the rock drill bit. The external spline sleeve 43 fixedly installed on the outer wall of the third hollow tube 41 is matched and connected with the spline groove 44 set on the inner wall of the lower end of the third outer sleeve 40, so that the torque of the high-pressure rotary power head 11 is transmitted to the third hollow tube 41 through the second outer sleeve 30, the third outer sleeve 40, and the external spline sleeve 43, and finally transmitted to the rock drill bit 42 through the third hollow tube 41.

[0030] The setting of the compression spring 5, on the one hand, ensures that the top end of the first hollow tube 23 is always tightly pressed and contacted with the inner conduit 222 of the rotating drainage tube 22, preventing the high-pressure air of the air compressor 6 from leaking between the inner conduit 222 of the rotating drainage tube 22 and the top end of the first hollow tube 23, and ensuring that the high-pressure air is completely delivered to the rock drill bit. On the other hand, the compression spring 5 cooperates with the cylinder 7 to complete the work station state switching of the drill pipe assembly 12. When the piston rod 70 of the cylinder 7 retracts, it pulls and presses the guide tube 21 downward relative to the first outer sleeve 20, and the bar tooth block 220 on the outer surface of the rotating drainage tube 22 is pressed downward by the guide teeth 211 on the pressing guide tube 21 until the bar tooth block 220 moves down to below the arc-shaped teeth 202 at the end of the partition 201 of the first outer sleeve 20, and then the piston rod 70 of the cylinder 7 is reset. Under the elastic force of the compression spring 5, the third hollow tube 41 The second hollow tube 31 and the first hollow tube 23 are pushed upward, and the first hollow tube 23 pushes the rotary drainage tube 22 in contact with it to move upward. At this time, the bar tooth block 220 moves upward with the rotary drainage tube 22 and produces the following two working positions of the drill pipe assembly 12. The first working position state: the bar tooth block 220 is guided by the arc teeth 202 at the end of the partition 201 into the deep guide groove 203 to slide a large distance, so that the rotary drainage tube 22 moves a long distance inside the pressing guide tube 21, so that the first hollow tube 23 inside the rotary drainage tube 22 follows the upward movement. The second hollow tube 31 and the third hollow tube 41 move up a large distance. At this time, the second hollow tube 31 and the third hollow tube 41 move up with the first hollow tube 23, and drive the rock drill bit 42 connected to the third hollow tube 41 to retract into the third outer sleeve 40, so as to meet the need of the third outer sleeve 40 to connect the rotary drilling bit 45; the second working position state: the bar tooth block 220 is guided by the arc-shaped teeth 202 at the end of the partition 201 into the lower part of the arc-shaped teeth 202 at the end of the shallow guide groove 204, and stays at the arc top of the arc-shaped teeth 202 at the end of the shallow guide groove 204, so that the rotary drainage tube 22 is pressed against the guide tube 21 moves a short distance inside, and the first hollow tube 23 inside the rotary drainage tube 22 moves up a small distance. At this time, the second hollow tube 31 and the third hollow tube 41 move up with the first hollow tube 23, and drive the rock drill bit 42 connected to the third hollow tube 41 to move a small distance and then be fixed outside the third outer sleeve 40, so as to meet the needs of the rock drill bit 42 to drill holes in hard rock formations; the above two working positions are alternately realized with the contraction and reset of the piston rod 70, so as to meet the needs of the drilling rig to switch the drilling operation mode to adapt to different geological structures. The working process and principle of the drill rod assembly 12 to produce the above two working positions are similar to the working principle of the push-type ballpoint pen used by people in daily life, except that the specific structure, mutual connection method, and function of each component are different.

[0031] A bearing box end cover 24 is fixed to the lower end of the first outer sleeve 20, a round nut 32 is fixed to the upper end of the second outer sleeve 30, a thrust bearing 33 is installed at the lower part of the round nut 32, a bearing box body 34 is installed outside the thrust bearing 33, and the bearing box body 34 is fixedly connected to the bearing box end cover 24 by bolts (not shown in the figure); the round nut 32 is fixedly connected to the second outer sleeve 30 by threads and a first flat key 35. This relative rotation connection structure between the first outer sleeve 20 and the second outer sleeve 30 is conducive to preventing the first outer sleeve 20 from rotating at a high speed following the second outer sleeve 30. Since the second slide seat 102 is fixedly connected to the outer surface of the first outer sleeve 20, the first outer sleeve 20 can be kept relatively still, ensuring the stability of the air supply duct connection.

[0032] A radial ball bearing 25 is installed inside the bottom end of the rotary drainage tube 22, and the first hollow tube 23 is inserted into the radial ball bearing 25. The radial ball bearing 25 can prevent the rotary drainage tube 22 from rotating at a high speed following the first hollow tube 23. Since the upper part of the rotary drainage tube 22 is connected to the air supply tube 61 through the outer conduit 221, the rotary drainage tube 22 remains stationary or rotates at a low speed, which is conducive to the stable air supply of the air supply tube 61.

[0033] A sealing ring 26 is provided at the contact surface between the first hollow tube 23 and the inner cavity of the rotary drainage tube 22. The provision of the sealing ring 26 is conducive to preventing the high-pressure air of the air compressor 6 from leaking between the inner conduit 222 of the rotary drainage tube 22 and the top of the first hollow tube 23, ensuring that all the high-pressure air is delivered to the rock drill bit.

[0034] A support slip ring 36 is provided between the second hollow tube 31 and the second outer sleeve 30. The support slip ring 36 is fixed on the tube wall of the second hollow tube 31, and the outer surface of the support slip ring 36 is slidably matched with the inner surface of the second outer sleeve 30. The provision of the support slip ring 36 is conducive to ensuring that the relative position of the second hollow tube 31 and the second outer sleeve 30 remains stable.

[0035] The second drill pipe assembly 3 includes at least one second outer sleeve 30 and at least one second hollow tube 31, the lower end of the second outer sleeve 30 is connected to the upper end of the third outer sleeve 40 by a thread or a flange, and the lower end of the second hollow tube 31 is connected to the upper end of the third hollow tube 41 by a thread or a flange.

[0036] The second outer sleeve 30 has multiple sections, and the second hollow tube 31 also has multiple sections. The number of the second outer sleeves 30 is the same as the number of the second hollow tubes 31, and the length of each section of the second outer sleeve 30 is the same as the length of the second hollow tube 31 inside it. Adjacent second outer sleeves 30 are connected by threads or flanges, and adjacent second hollow tubes 31 are also connected by threads or flanges. The above design of the second drill rod assembly 3 is conducive to increasing or decreasing the length of the drill rod assembly 12 according to construction needs.

[0037] The rock drill bit 42 is a common alloy drill bit or an impact drill bit with an impactor. In this embodiment, a common alloy drill bit is selected, and those skilled in the art can also select an impact drill bit with an impactor according to construction needs.

[0038] On the outer surface of the third outer sleeve 40, a double helical blade 49 is spirally wound, and a plurality of bullet-shaped pick teeth 490 are arranged on the edge of the double helical blade 49. The arrangement of the double helical blade 49 is also conducive to the discharge of rock slag debris near the rock drill bit 42.

[0039] The rotary drilling bit 45 of the present embodiment is a rotary drilling bucket, and a spiral drill bit can be selected as needed during construction.

[0040] The pile driver for road and bridge construction of this embodiment further includes a transition joint 8, the upper end of the transition joint 8 is connected to the lower end of the third outer sleeve 40 through a pin shaft, and the lower end of the transition joint 8 is connected to the rotary drilling bit 45. The provision of the transition joint 8 is conducive to improving the pile driver to select more types of rotary drilling bits and improve the adaptability of the pile driver to drilling construction.

[0041] Embodiment 1 of the present invention also provides a method for using a pile driver for road and bridge construction, comprising the following working steps: S1, keep the drill rod assembly 12 in the first working position, retract the rock drill bit 42 into the third outer casing 40, connect the third outer casing 40 with a suitable rotary drill bit 45, and drive the high-pressure rotary power head 11 to drill holes in the upper soft soil; S2. When drilling into a hard rock formation, the rotary drill bit 45 is difficult to continue to drill a hole, and the rotary drill bit 45 is removed, so that the drill rod assembly 12 remains in the second working position. At this time, the rock drill bit 42 is fixed outside the third outer casing 40, and the rock drill bit 42 drills a hole in the hard rock formation under the drive of the high-pressure rotary power head 11. The air compressor 6 is turned on to supply high-pressure air to the rock drill bit 42 to meet the needs of cooling the rock drill bit 42 and discharging rock debris near the rock drill bit 42. S3. When the rock slag produced by the rock drill bit 42 is too much to be discharged in time, or when encountering a relatively soft formation, turn off the air compressor 6, switch the drill rod assembly 12 from the second working position to the first working position, install the rotary drilling bit 45, and use the rotary drilling bit 45 to clean the rock slag and expand the hole in time, or drill in the soft formation; S4. According to the formation conditions and rock slag discharge conditions encountered during drilling, the working state of the drill rod assembly 12 is switched in time, and the appropriate type of rock drill bit 42 and rotary drilling drill bit 45 is used as required until the designed drilling depth requirement is reached.

[0042] In S1, Example 1 of the present invention also provides a steel pipe sleeve and a lifting device. After the rotary drill bit 45 drills a hole to a certain depth, the operator uses the lifting device to lift the steel pipe sleeve into the pile hole and continues to use the rotary drill bit 45 to drill downward.

[0043] The method for using the pile driver for road and bridge construction of Example 1 of the present invention effectively combines the advantages of rotary drilling rig equipment and drilling equipment specifically for hard rock formations, and can conveniently switch the drilling construction mode using one device. Suitable drilling processes are adopted according to the characteristics of different stratum structures, which effectively solves the technical problem of using the same drilling equipment to successively complete two drilling construction operations in two different stratum structures. It not only reduces the purchase, maintenance, and transportation costs of the equipment, but also avoids the situation where the construction progress is affected by frequent replacement of drilling equipment, thereby improving construction efficiency and greatly reducing construction costs.

[0044] The above embodiments and drawings are only used to illustrate the technical solutions of the present invention, and are not intended to limit the present invention. The present invention is described in detail with reference to the preferred embodiments. It should be understood by those skilled in the art that any changes, modifications, additions or substitutions made by those skilled in the art within the essential scope of the present invention do not deviate from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention. Other related technical structures not fully disclosed in the present invention are prior art in the art.

Claims

1. A pile driver for road and bridge construction, comprising a mobile vehicle and a pile driver frame installed at the end of the mobile vehicle, a high-pressure rotary power head installed on the pile driver frame, and a drill rod assembly installed on the high-pressure rotary power head, characterized in that: The drill rod assembly includes a first drill rod assembly, a second drill rod assembly, and a third drill rod assembly; the first drill rod assembly includes a first outer sleeve, a pressing guide tube, a rotating drainage tube, and a first hollow tube that are sleeved together from the outside to the inside; the second drill rod assembly includes a second outer sleeve and a second hollow tube that are sleeved together from the outside to the inside; the third drill rod assembly includes a third outer sleeve and a third hollow tube that are sleeved together from the outside to the inside; the lower end of the first outer sleeve is rotatably connected to the upper end of the second outer sleeve, the lower end of the second outer sleeve is fixedly connected to the upper end of the third outer sleeve, and the first hollow tube, the second hollow tube, and the third hollow tube are fixedly connected in sequence from top to bottom; A slide rail is fixed on the pile driving frame, a first slide seat and a second slide seat are installed on the slide rail, the high-pressure rotary power head is installed on the first slide seat, the second outer sleeve passes through and is fixed on the high-pressure rotary power head; the second slide seat is fixedly connected to the outer surface of the first outer sleeve; A rock drill bit is fixedly connected to the lower end of the third hollow tube, an external spline sleeve is fixedly installed on the outer wall of the third hollow tube above the rock drill bit, a spline groove is provided on the inner wall of the lower end of the third outer sleeve, the external spline sleeve is matched and connected with the spline groove, and a mounting hole for hanging the rotary drilling bit is also provided at the lower end of the third outer sleeve; A lower support ring is fixedly provided on the inner tube wall of the third outer sleeve, an upper support ring is fixedly provided on the outer tube wall of the third hollow tube, and a compression spring is installed between the lower support ring and the upper support ring; The inner cavity wall of the first outer sleeve is provided with evenly distributed guide grooves, partitions are provided between adjacent guide grooves, and arc-shaped teeth are provided at the end of the partition, the guide grooves are divided into deep guide grooves and shallow guide grooves, the deep guide grooves and the shallow guide grooves are arranged at intervals, the bottom end of the shallow guide grooves is also provided with arc-shaped teeth, and the arc-shaped teeth on the shallow guide grooves are connected to the arc-shaped teeth at the end of the partition; the outer side surface of the pressing guide tube is evenly provided with guide strips, the guide strips on the pressing guide tube are slidably matched with the guide grooves of the first outer sleeve, and guide teeth are provided at the bottom end of the pressing guide tube; the bottom end of the outer surface of the rotating drainage tube is provided with evenly distributed bar-shaped tooth blocks, and the upper part of the rotating drainage tube is provided with an outer conduit, one end of the outer conduit is connected to the inner conduit of the rotating drainage tube, and the other end of the outer conduit is connected to the air supply pipe of the air compressor, and the inner conduit of the rotating drainage tube is in close contact with the top end of the first hollow tube; A cylinder is fixedly mounted on the outer tube wall of the first outer sleeve, and a piston rod of the cylinder is fixedly connected to press the outer tube wall of the guide tube.

2. The pile driver for road and bridge construction according to claim 1, characterized in that: When the piston rod of the cylinder retracts, the pressing guide tube is pulled downward relative to the first outer sleeve, and the strip tooth block on the outer surface of the rotating drainage tube is pressed downward by the guide teeth on the pressing guide tube until the strip tooth block moves down to below the arc-shaped teeth at the partition end of the first outer sleeve, and then the piston rod of the cylinder is reset, and under the elastic force of the compression spring, the third hollow tube pushes the second hollow tube and the first hollow tube to move upward, and the first hollow tube pushes the rotating drainage tube in contact with it to move upward. At this time, the strip tooth block moves upward with the rotating drainage tube and produces the following two working positions of the drill rod assembly. The first working position state: the strip tooth block is guided by the arc-shaped teeth at the partition end into the deep guide groove and slides a large distance, so that the rotating drainage tube moves a long distance inside the pressing guide tube, thereby causing the first hollow tube inside the rotating drainage tube to follow and move up a large distance. At this time, the second hollow tube and the third hollow tube It follows the first hollow tube to move upward and drives the rock drill bit connected to the third hollow tube to retract into the third outer casing, meeting the need of the third outer casing to connect the rotary drilling bit; second working position state: the strip tooth block is guided by the arc-shaped teeth at the partition end into the lower part of the arc-shaped teeth at the end of the shallow guide groove, and stays at the arc top of the arc-shaped teeth at the end of the shallow guide groove, so that the rotating drainage tube moves a short distance inside the pressing guide tube, and the first hollow tube inside the rotating drainage tube follows and moves upward a small distance. At this time, the second hollow tube and the third hollow tube follow the first hollow tube to move upward, and drive the rock drill bit connected to the third hollow tube to move a short distance and then be fixed outside the third outer casing, meeting the need of the rock drill bit to drill holes in hard rock formations; the above two working position states are alternately realized with the contraction and resetting of the piston rod, meeting the need of the drilling rig to switch drilling operation modes to adapt to different geological structures.

3. The pile driver for road and bridge construction according to claim 1, characterized in that: A bearing box end cover is fixed to the lower end of the first outer sleeve, a round nut is fixed to the upper end of the second outer sleeve, a thrust bearing is installed at the lower part of the round nut, a bearing box body is installed outside the thrust bearing, and the bearing box body and the bearing box end cover are fixedly connected by bolts; the round nut and the second outer sleeve are fixedly connected by threads and a first flat key.

4. The pile driver for road and bridge construction according to claim 1, characterized in that: A radial ball bearing is installed inside the bottom end of the rotary drainage tube, and the first hollow tube is inserted into the radial ball bearing.

5. The pile driver for road and bridge construction according to claim 1, characterized in that: A sealing ring is provided at the contact surface between the first hollow tube and the inner cavity of the rotary drainage tube.

6. The pile driver for road and bridge construction according to claim 1, characterized in that: A support slip ring is provided between the second hollow tube and the second outer sleeve. The support slip ring is fixed on the tube wall of the second hollow tube, and the outer surface of the support slip ring is slidably matched with the inner surface of the second outer sleeve.

7. The pile driver for road and bridge construction according to claim 1, characterized in that: The second drill pipe assembly includes at least one second outer sleeve and at least one second hollow tube, the lower end of the second outer sleeve is connected to the upper end of the third outer sleeve by a thread or a flange, and the lower end of the second hollow tube is connected to the upper end of the third hollow tube by a thread or a flange.

8. The pile driver for road and bridge construction according to claim 7, characterized in that: The second outer sleeve has multiple sections, and the second hollow tube also has multiple sections. The number of the second outer sleeves is the same as the number of the second hollow tubes, and the length of each section of the second outer sleeve is the same as the length of the second hollow tube inside it. Adjacent second outer sleeves are connected by threads or flanges, and adjacent second hollow tubes are also connected by threads or flanges.

9. The pile driver for road and bridge construction according to claim 1, characterized in that: A double helical blade is spirally wound on the outer surface of the third outer sleeve, and a plurality of bullet-shaped pick teeth are arranged on the edge of the double helical blade.

10. The method for using a pile driver for road and bridge construction according to any one of claims 1 to 9, characterized in that: The steps include: S1. Keep the drill rod assembly in the first working position, retract the rock drill bit into the third outer casing, connect a suitable rotary drill bit to the third outer casing, and drive the rotary drill bit to drill holes in the upper soft soil under the drive of the high-pressure rotary power head; S2. When drilling into a hard rock formation, the rotary drill bit is difficult to continue to drill a hole, so the rotary drill bit is removed and the drill rod assembly is kept in the second working position. At this time, the rock drill bit is fixed outside the third outer casing. The rock drill bit drills a hole in the hard rock formation under the drive of the high-pressure rotary power head. The air compressor is turned on to supply high-pressure air to the rock drill bit to meet the needs of cooling the rock drill bit and discharging rock debris near the rock drill bit. S3. When the rock debris generated by the rock drill bit is too much to be discharged in time, or when encountering a relatively soft formation, turn off the air compressor, switch the drill rod assembly from the second working position to the first working position, install the rotary drilling bit, use the rotary drilling bit to clean the rock debris and expand the hole in time, or drill in the soft formation; S4. According to the formation conditions and rock slag discharge conditions encountered during drilling, the working state of the drill pipe assembly is switched in time, and the appropriate type of rock drill bit and rotary drilling bit is used as required until the designed drilling depth requirement is reached; In S1, a steel pipe sleeve and a lifting device are provided. After the rotary drill bit drills a hole to a certain depth, the operator uses the lifting device to lift the steel pipe sleeve into the pile hole, and continues to use the rotary drill bit to drill downward.

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