A pile foundation boring machine for building foundation engineering

Abstract

A pile foundation boring machine for building foundation engineering includes a drilling frame, a power head, a hydraulic vertical lifting frame, a winch, a telescopic pull rod and a drill mechanism. The drilling frame includes an upper support ring, a lower support ring and an oblique support rod. The power head, the hydraulic vertical lifting frame and the winch are all arranged on the lower support ring. The two hydraulic vertical lifting frames are used to support and raise the drill mechanism to facilitate the replacement of the drill mechanism. The power head is arranged between the two hydraulic vertical lifting frames and is used to drive the telescopic pull rod to rotate. The upper support ring is connected to the top of the hydraulic vertical lifting frame through the oblique support rod. The winch is arranged at one end of the lower support ring and is connected to the telescopic pull rod by a steel wire rope passing around the upper support ring. The telescopic pull rod is connected to the drill mechanism. The present invention is simple and light, has a low manufacturing cost, and can be applied to various different pile driving environments and hole diameters; has a strong hole expansion capacity, high drilling stability, can reduce labor costs, avoid safety hazards of manually excavated piles, and can greatly improve construction efficiency and hole expansion efficiency.

Description

Technical Field

[0001] The invention relates to the field of building pile foundation engineering, and in particular to a pile foundation hole digging machine used in building foundation engineering. Background Art

[0002] With the development of my country's modernization construction, there are more and more high-rise and super-high-rise buildings in engineering construction. Since the load transmitted from the upper part during the foundation construction of high-rise buildings is very huge, ordinary foundations are difficult to bear and must be specially treated to meet the requirements of the designed foundation bearing capacity and settlement. The implementation of pile foundation hole expansion construction can greatly improve the bearing capacity of a single pile and save engineering costs.

[0003] The construction of bored piles is divided into two parts: hole forming and pile forming. The hole forming is the first link in the construction of bored piles. The rotary drilling machines in conventional bored piles all use mud wall protection, which is more effective for pile foundation construction with a diameter of 0.8m-1.5m. However, for large-diameter construction of 1.5m or even 2.5m or more, the existing large-diameter rotary drilling machines are expensive and mostly foreign equipment. On the one hand, the whole machine is bulky and the cost of digging holes is high. At the same time, a special crane is required for use, which increases the cost and difficulty of operation. It is not suitable for urban construction. On the other hand, if a rock layer is encountered, a pull rod is used to drive the drill bit to rotate. During the drilling process, the connecting rod swings and the drill bit vibrates greatly, which can easily cause the pile hole to deviate and the drill bit system to be damaged, resulting in the inability to construct. Manual digging is often used for large-diameter construction. The construction progress of manual bored piles is slow. Workers have to dig the soil manually in the downloaded holes. The working environment is harsh, the labor intensity is high, the digging efficiency is low, and there are many safety hazards. For example, water seepage at the bottom of the hole, methane, landslides, etc. will pose a danger to the lives of construction workers. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art and provide a pile foundation boring machine for building foundation engineering.

[0005] The technical solution adopted by the present invention to solve its technical problems is a pile foundation boring machine used in building foundation engineering, including a drilling rig, a power head, a hydraulic vertical lifting frame, a winch, a telescopic pull rod and a drill bit mechanism. The drilling rig includes an upper support ring, a lower support ring and an inclined support rod. The power head, the hydraulic vertical lifting frame and the winch are all arranged on the lower support ring. The two hydraulic vertical lifting frames are used to support and raise the drill bit mechanism to facilitate the replacement of the drill bit mechanism. The power head is arranged between the two hydraulic vertical lifting frames and is used to drive the telescopic pull rod to rotate. The upper support ring is connected to the top end of the hydraulic vertical lifting frame through the inclined support rod. The winch is arranged at one end of the lower support ring and is connected to the telescopic pull rod by a steel wire rope passing around the upper support ring. The telescopic pull rod is connected to the drill bit mechanism.

[0006] Preferably, the drill bit mechanism is a rock shield mechanism, which includes an upper shell, a lower shell, a bearing, a screw pump, a transmission motor, a transmission mechanism and a rock drill bit, the telescopic pull rod is connected to the top of the upper shell, the upper shell is rotatably connected to the lower shell through a bearing, the transmission motor is arranged in the upper shell, the transmission motor drives the lower shell to rotate through the transmission mechanism, the screw pump passes through the bearing to connect the upper shell and the lower shell, and the rock drill bit is arranged at the bottom end of the lower shell.

[0007] Preferably, the transmission mechanism includes a bracket, a pinion, a transmission bearing and an internal gear plate, the bracket is arranged on the lower shell body, the transmission bearing is arranged on the bracket, the output shaft of the transmission motor passes through the bottom end of the upper shell body and is connected to the transmission bearing, the pinion gear is sleeved on the output shaft of the transmission motor, the internal gear plate is fixedly connected to the lower shell body and meshes with the pinion gear, and the pinion gear drives the lower shell body to rotate through the internal gear plate.

[0008] Preferably, the screw pump includes a drainage motor, a pump pipe, a mud outlet, a suction chamber, a leak-proof liquid cover and a water inlet pipe, the drainage motor is arranged at the top end of the pump pipe, the pump pipe is connected with the mud outlet, the mud outlet passes through the upper shell to discharge the mud outward, the pump pipe passes through the bearing and is connected with the suction chamber arranged in the lower shell, the leak-proof liquid cover is arranged in the upper shell to form a leak-proof liquid chamber with the upper shell, the bearing is arranged in the leak-proof liquid chamber, the water inlet pipe is sleeved on the pump pipe, the water inlet pipe passes through the bearing to connect the upper shell and the lower shell, the water inlet pipe is provided with a water inlet, the bottom end of the water inlet is connected to the upper end of the water inlet pipe, the top end of the water inlet passes through the upper shell, and clean water flows through the water inlet through the water inlet pipe to reach the lower shell.

[0009] Preferably, the rock drill bit comprises a first drill bit and a second drill bit, wherein the first drill bit is arranged at the center of the bottom end of the lower shell body, and the second drill bit is arranged at the outer periphery of the lower shell body.

[0010] Preferably, the bottom surface of the lower shell is a conical structure with a central portion convex outward, the bottom surface of the lower shell is provided with a slag discharge hole, the bottom surface of the lower shell is provided with a cutter disc, the cutter disc is provided with a plurality of roller cutter mechanisms, the roller cutter mechanisms include a single-edged roller cutter, a cutter shaft and an end cover, the plurality of single-edged roller cutter sleeves are provided on the cutter shaft, and the end covers are provided on both sides of the single-edged roller cutter.

[0011] Optionally, the drill bit mechanism is a reaming drill bit mechanism, which includes a drill bit body, an upper connecting seat, a reaming arm and an alloy drill bit, the drill bit body includes a shell, a limit seat, a chassis and a slag discharge hole, the shell and the chassis form a accommodating space, the limit seat is arranged at the top of the shell, the slag discharge hole is arranged on the chassis, the telescopic pull rod passes through the limit seat and is connected with the top of the upper connecting seat arranged in the accommodating space, the reaming arm includes an upper reaming arm and a lower reaming arm, the upper reaming arm and the lower reaming arm are hinged to each other, the top end of the upper reaming arm is hinged to the upper connecting seat, the bottom end of the lower reaming arm is hinged to the shell, a plurality of scrapers are provided on the lower reaming arm, the alloy drill bit is arranged in the center of the chassis, the telescopic pull rod is provided with a spring, and the spring is arranged between the limit seat and the upper connecting seat.

[0012] Preferably, a lower connecting seat, a lock and an unlocking rod are provided at the bottom end of the shell, the unlocking rod controls the lock switch, a buckle is provided on the chassis, the lower connecting seat is hinged to one end of the chassis, the buckle is adapted to the lock, a cutter disc is provided on the chassis, a plurality of scrapers are provided on the cutter disc, and the alloy drill bit is arranged in the center of the cutter disc.

[0013] Preferably, a sensor is provided in the shell, and the sensor is electrically connected to the power head for sensing the height of the soil loaded in the accommodating space.

[0014] Preferably, four hydraulic support legs are provided at the bottom of the lower support ring for supporting and fixing the position of the lower support ring. The hydraulic support legs can adjust the height to facilitate the horizontal setting of the lower support ring. The lower support ring is provided with multiple hooks for towing the drill rig to move.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] Sleepers or steel pipes are laid at the bottom of the drill rig, and the drill rig is moved to the position where piling is required by pulling hooks. When piling is carried out under geological conditions other than bedrock bearing layers, a hole-reaming drill mechanism is used for construction. The winch is unwound, and the telescopic pull rod is pressed downward to expand the hole-reaming arm. The power head drives the telescopic pull rod to rotate the drill body, and the cutter disc performs bottom rotary excavation, and the hole-reaming arm performs hole-reaming on the hole wall. The slag enters the drill body from the slag outlet. When the sensor senses that the slag in the drill body reaches a preset height, the telescopic pull rod rotates to close the slag outlet of the cutter disc, and the drill body stops rotary excavation. The winch is reeled in, the telescopic pull rod is lifted upward, the hole-reaming arm is retracted, and the telescopic pull rod drives the drill body to the ground, and the unlocking pull rod is pressed to open the lock, the chassis opens to discharge the slag, and the chassis is closed to start the next rotary excavation. When a rock layer is encountered during construction, the drill bit is replaced with a rock layer. When the shield mechanism is in use, the telescopic pull rod is connected to the upper shell body through the reinforcing ribs to prevent the connecting rod from swinging, the winch is unwound, and the telescopic pull rod is pressed downward to drive the shield drill bit to enter the area to be drilled, and clean water is introduced into the water inlet. The three transmission motors synchronously drive the three small gears to rotate, and the three small gears are meshed with the internal gear plate, synchronously driving the lower shell body to rotate, and the single-edged roller cutter wet-grinds the rock. The mud generated during the drilling process enters the lower shell body through the slag discharge hole, and the drainage motor discharges the mud from the mud outlet through the pump pipe through the suction chamber, which can effectively avoid the vibration of the drill bit caused by the swing of the connecting rod and ensure the verticality of the pile hole. The present invention is simple and light, with low production cost, and can be applied to various different piling environments and hole diameters; it has strong hole expansion ability and high drilling stability, can reduce labor costs, avoid the safety hazards of manually excavated bored piles, and can greatly improve the construction efficiency and hole expansion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the following specific embodiments, but should not be construed as limiting the present invention.

[0018] Figure 1 It is a structural schematic diagram of one embodiment of the present invention;

[0019] Figure 2 It is a structural schematic diagram of a rock shield mechanism;

[0020] Figure 3 for Figure 2 The structural schematic diagram of the transmission mechanism shown;

[0021] Figure 4 for Figure 2 A top view of the rock shield mechanism is shown;

[0022] Figure 5 for Figure 2 A schematic diagram of the structure of the lower shell shown;

[0023] Figure 6 for Figure 5The structural schematic diagram of the hob mechanism shown;

[0024] Figure 7 It is a structural schematic diagram of the reaming drill bit mechanism;

[0025] Figure 8 for Figure 7 The schematic diagram of the structure of the expansion arm when it is contracted is shown;

[0026] Fig. 9 for Figure 7 A bottom view of the reaming drill bit mechanism is shown.

[0027] Description of the accompanying drawings: 1-drilling frame, 11-upper support ring, 12-lower support ring, 121-pull hook, 122-hydraulic support leg, 13-oblique support rod, 2-power head, 3-hydraulic vertical lifting frame, 4-winch, 5-telescopic pull rod, 51-spring, 6-drill mechanism, 611-upper shell, 612-lower shell, 6121-slag discharge hole, 6122-cutter disc, 61221-roller mechanism, 612211-single-edged roller, 612212-cutter shaft, 612213-end cover, 614-bearing, 615-screw pump, 6151-drainage motor, 6152-pump pipe, 6153-mud outlet, 6154-suction chamber, 6155-leakage-proof cover, 6156-water inlet pipe, 61561-water inlet, 616 -Transmission motor, 617-transmission mechanism, 6171-bracket, 6172-pinion, 6173-transmission bearing, 6174-internal gear plate, 618-rock drill bit, 6181-first drill bit, 6182-second drill bit, 621-drill bit body, 6211-housing, 62111-lower connecting seat, 62112-lock, 62113-unlocking pull rod, sensor 62114, 6212-limiting seat, 6213-chassis, 62131-buckle, 62132-knife disc, 62133-scraper, 6214-slag outlet, 623-upper connecting seat, 624-reaming arm, 6241-upper reaming arm, 6242-lower reaming arm, 625-alloy drill bit, 52-fixing mechanism, 521-positioning pin. DETAILED DESCRIPTION

[0028] The technical solution provided by the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0029] Please also read Figure 1-Figure 9A pile foundation boring machine for building foundation engineering comprises a drilling rig 1, a power head 2, a hydraulic vertical lifting frame 3, a winch 4, a telescopic pull rod 5 and a drill bit mechanism 6. The drilling rig 1 comprises an upper support ring 11, a lower support ring 12 and an oblique support rod 13. The power head 2, the hydraulic vertical lifting frame 3 and the winch 4 are all arranged on the lower support ring 12. The two hydraulic vertical lifting frames 3 are used to support and raise the drill bit mechanism 6 to facilitate the replacement of the drill bit mechanism 6. The power head 2 is arranged between the two hydraulic vertical lifting frames 3 and is used to drive the telescopic pull rod 5 to rotate. The upper support ring 11 is connected to the top end of the hydraulic vertical lifting frame 3 through the oblique support rod 13. The winch 4 is arranged at one end of the lower support ring 12 and is connected to the telescopic pull rod 5 by a steel wire rope passing around the upper support ring 11. The telescopic pull rod 5 is connected to the drill bit mechanism 6.

[0030] The drill mechanism 6 is a rock shield mechanism, which includes an upper shell 611, a lower shell 612, a bearing 614, a screw pump 615, a transmission motor 616, a transmission mechanism 617 and a rock drill bit 618. The telescopic pull rod 5 is connected to the top of the upper shell 611, and the upper shell 611 is rotatably connected to the lower shell 612 through a bearing 614. The transmission motor 616 is arranged in the upper shell 611, and the transmission motor 616 drives the lower shell 612 to rotate through the transmission mechanism 617. The screw pump 615 passes through the bearing 614 to connect the upper shell 611 and the lower shell 612, and the rock drill bit 618 is arranged at the bottom end of the lower shell 612.

[0031] The transmission mechanism 617 includes a bracket 6171, a pinion 6172, a transmission bearing 6173 and an inner gear plate 6174. The bracket 6171 is arranged on the lower housing 612. The transmission bearing 6173 is arranged on the bracket 6171. The output shaft of the transmission motor 616 passes through the bottom end of the upper housing 611 and is connected to the transmission bearing 6173. The pinion 6172 is sleeved on the output shaft of the transmission motor 616. The inner gear plate 6174 is fixed to the lower housing 612 and meshes with the pinion 6172. The pinion 6172 drives the lower housing 612 to rotate through the inner gear plate 6174. The three pinions 6172 mesh with the inner gear plate 6174 to ensure the stability of the drill bit during drilling and avoid drilling deviation caused by vibration of the drill bit. Damage to the drill bit.

[0032] The screw pump 615 includes a drainage motor 6151, a pump pipe 6152, a mud outlet 6153, a suction chamber 6154, a liquid leakage prevention cover 6155 and a water inlet pipe 6156. The drainage motor 6151 is arranged at the top of the pump pipe 6152. The pump pipe 6152 is connected to the mud outlet 6153. The mud outlet 6153 passes through the upper shell 611 to discharge mud outward. The pump pipe 6152 passes through the bearing 614 and is connected to the suction chamber 6154 arranged in the lower shell 612. The liquid leakage prevention cover 6155 is arranged in the upper shell 611 to form a liquid leakage prevention chamber with the upper shell 611. The bearing 614 is provided In the leak-proof liquid cavity, the bearing 614 is arranged in the leak-proof liquid cavity, which can effectively prevent mud from overflowing and entering the upper shell 611 to affect the normal operation of the transmission motor 616. The water inlet pipe 6156 is sleeved on the pump pipe 6152, and the water inlet pipe 6156 passes through the bearing 614 to connect the upper shell 611 and the lower shell 612. A water inlet port 61561 is provided on the water inlet pipe 6156, and the bottom end of the water inlet port 61561 is connected to the upper end of the water inlet pipe 6156, and the top end of the water inlet port 61561 passes through the upper shell 611, and clean water flows through the water inlet pipe 6156 through the water inlet port 61561 to reach the lower shell 612.

[0033] The rock drill bit 618 includes a first drill bit 6181 and a second drill bit 6182 . The first drill bit 6181 is disposed at the center of the bottom end of the lower shell 612 , and the second drill bit 6182 is disposed at the outer peripheral edge of the lower shell 612 .

[0034] The bottom surface of the lower shell 612 is a conical structure with a central portion convex outward, and a slag discharge hole 6121 is provided on the bottom surface of the lower shell 612. A cutter disc 6122 is provided on the bottom surface of the lower shell 612, and a plurality of roller cutter mechanisms 61221 are provided on the cutter disc 6122. The roller cutter mechanisms 61221 include a single-edged roller cutter 612211, a cutter shaft 612212, and an end cover 612213. The plurality of single-edged roller cutters 612211 are sleeved on the cutter shaft 612212, and the end covers 612213 are provided on both sides of the single-edged roller cutter 612211.

[0035] A reinforcing rib is provided at the top of the upper shell 611, and the reinforcing rib is connected to the telescopic pull rod 3 to prevent the connecting rod from swinging.

[0036] The drill mechanism 6 is a hole-reaming drill mechanism, which includes a drill body 621, an upper connecting seat 623, a hole-reaming arm 624, an alloy drill 625 and a fixing mechanism 52. The drill body 621 includes a shell 6211, a limit seat 6212, a chassis 6213 and a slag outlet 6214. The shell 6211 and the chassis 6213 form a accommodating space. The limit seat 6212 is arranged at the top of the shell 6211. The slag outlet 6214 is arranged on the chassis 6213, the telescopic pull rod 5 passes through the limit seat 6212 and is connected to the top end of the upper connecting seat 623 arranged in the accommodating space, the reaming arm 624 includes an upper reaming arm 6241 and a lower reaming arm 6242, the upper reaming arm 6241 and the lower reaming arm 6242 are hinged to each other, the top end of the upper reaming arm 6241 is hinged to the upper connecting seat 623, and the bottom end of the lower reaming arm 6242 is hinged to the upper connecting seat 623. The shell 6211 is hinged, and a plurality of scrapers 62133 are provided on the lower reaming arm 6242. The alloy drill bit 625 is arranged in the center of the chassis 6213. The fixing mechanism 52 is arranged at the top of the shell 6211, and is used to fix the height of the telescopic rod 5. The fixing mechanism 52 is a positioning pin 521. The shell 6211 and the telescopic rod 5 are both provided with a through hole compatible with the positioning pin 521. The positioning pin 521 passes through the through hole to limit the height of the telescopic rod 5 extending into the shell 6211, so that the reaming arm 624 is in a retracted state. A spring 51 is sleeved on the telescopic rod 5, and the spring 51 is arranged between the limit seat 6212 and the upper connecting seat 623. The reaming drill bit is pressed down by the weight of the telescopic rod 5 to expand the reaming arm 624. The telescopic rod 5 drives the drill body 621 to rotate and reame, and the spring 51 plays a buffering role to prevent the reaming arm 624 from being damaged by rock blocks.

[0037] A lower connecting seat 62111, a lock 62112 and an unlocking rod 62113 are provided at the bottom end of the shell 6211. The unlocking rod 62113 controls the switch of the lock 62112. A buckle 62131 is provided on the chassis 6213. The lower connecting seat 62111 is hinged to one end of the chassis 6213. The buckle 62131 is adapted to the lock 62112. A cutter disc 62132 is provided on the chassis 6213. A plurality of scrapers 62133 are provided on the cutter disc 62132. The alloy drill bit 625 is provided at the center of the cutter disc 62132.

[0038] The shell 6211 is provided with a sensor 62114, which is electrically connected to the power head 2 and is used to sense the height of the soil loaded in the accommodating space. The sensor 62114 is connected to an external driving motor, and the telescopic rod 5 drives the drill body 621 to rotate and expand the hole, and the slag enters the drill body 621 from the slag discharge hole 6214. When the sensor 62114 senses that the slag in the drill body 621 reaches a preset height, the telescopic rod 5 rotates to make the cutter disc 62132 close the slag discharge hole 6214, and the drill body 621 stops rotary drilling, the telescopic rod 5 is lifted upward, the hole expansion arm 624 is retracted, and the telescopic rod 5 drives the drill body 621 to be lifted to the ground, the unlocking rod 62113 is pressed to open the lock 62112, the chassis 6213 is opened to discharge the slag, and the chassis 6213 is closed to start the next rotary drilling.

[0039] Four hydraulic support legs 122 are provided at the bottom of the lower support ring 12 for supporting and fixing the position of the lower support ring 12. The hydraulic support legs 122 can adjust the height of the lower support ring 12 so that the lower support ring 12 can be set horizontally. Six hooks 121 are provided on the lower support ring 12. The six hooks 121 are distributed on the four sides of the lower support ring 12 for towing the drill rig 1 to move. The number of the hooks 121 can be increased or decreased according to demand. When the drill rig 1 needs to move, sleepers or steel pipes are laid at the bottom of the drill rig 1, and the hydraulic support legs 122 are retracted until the bottom ends of the hydraulic support legs 122 are flush with the bottom surface of the lower support ring 12, so as to avoid the hydraulic support legs 122 hindering the rolling of the sleepers or steel pipes when the drill rig 1 is towed to move.

[0040] In this embodiment, there are two reaming arms 624 distributed in the radial direction of the drill body 621; the reaming arms 624 can also be increased to three, four or more according to the needs of reaming, and evenly distributed on the drill body 621.

[0041] Working principle of the present invention:

[0042] Sleepers or steel pipes are laid at the bottom of the drill rig 1, the hydraulic support legs 122 are retracted, and the drill rig 1 is pulled to move to the position where piling is required by the hook 121, the hydraulic support legs 122 are opened, the position of the drill rig 1 is fixed, and the height of the hydraulic support legs 122 is adjusted to make the drill rig 1 horizontal. When piling is performed under geological conditions other than the bedrock bearing layer, an expansion drill mechanism is used for construction, and the positioning pin 6261 passes through the through holes on the shell 6211 and the telescopic pull rod 5, so that the expansion arm 624 is in a retracted state, and the cutter head 62132 on the expansion drill bit performs bottom rotary drilling. When the rotary drilling height is not less than 1m, the expansion drill mechanism is lifted, the slag in the drill bit body 621 is discharged, the positioning pin 6261 is pulled out, the winch 4 is unwound, the telescopic pull rod 5 is pressed downward to open the expansion arm 624, and the power head 2 drives the telescopic pull rod 5 to pull the expansion arm 624 open. The rod 5 drives the drill body 621 to rotate, the cutter disc 62132 performs bottom rotary excavation, the reaming arm 624 performs hole wall reaming, and the slag enters the drill body 621 from the slag outlet 6214. When the sensor 62114 senses that the slag in the drill body 621 reaches a preset height, the telescopic pull rod 5 rotates to make the cutter disc 62132 close the slag outlet 6214, the drill body 621 stops rotary excavation, the winch 4 is wound up, the telescopic pull rod 5 is lifted upward, the reaming arm 624 contracts, and the telescopic pull rod 5 drives the drill body 621 to be lifted to the ground, the unlocking pull rod 62113 is pressed to open the lock 62112, the chassis 6213 is opened to discharge the slag, and the chassis 6213 is closed to start the next rotary excavation, and the prefabricated semicircular concrete ring is spliced ​​and placed in the pile foundation hole. The concrete ring sinks as the reaming arm 4 rotary excavates to remove the excess soil.

[0043] When the construction encounters a rock layer, the drill bit is replaced with a rock shield mechanism. When in use, the telescopic pull rod 5 is connected to the upper shell through the reinforcing rib 6111 to prevent the connecting rod from swinging. The winch 4 is unwound, and the telescopic pull rod 5 is pressed downward to drive the shield drill bit into the area to be drilled. Clean water is introduced into the water inlet 61561. The three transmission motors 616 synchronously drive the three pinions 6172 to rotate. The three pinions 6172 are meshed with the inner gear plate 6174, synchronously driving the lower shell 612 to rotate. The single-edged hob 612211 wet-grinds the rock. The mud generated during the drilling process enters the lower shell 612 through the slag discharge hole 6121. The drainage motor 6151 discharges the mud from the mud outlet 6153 through the suction chamber 6154 through the pump pipe 6152, which can effectively avoid the vibration of the drill bit caused by the swing of the connecting rod and ensure the verticality of the pile hole.

[0044] The present invention mainly solves the demand for construction equipment in special construction environments. The pile foundation digging machine provided by the present invention is low in cost, highly flexible, simple and light, and can be applied to the construction of building pile foundation projects with large and small apertures in various special construction environments. It can solve the large-aperture digging construction in various soil conditions, greatly improve the digging efficiency and quality, and eliminate safety hazards.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pile foundation boring machine for building foundation engineering, characterized by: The invention comprises a drilling rig (1), a power head (2), a hydraulic vertical lifting frame (3), a winch (4), a telescopic pull rod (5) and a drill bit mechanism (6). The drilling rig (1) comprises an upper support ring (11), a lower support ring (12) and an oblique support rod (13). The power head (2), the hydraulic vertical lifting frame (3) and the winch (4) are all arranged on the lower support ring (12). The two hydraulic vertical lifting frames (3) are used to support and raise the drill bit mechanism (6) so as to facilitate the replacement of the drill bit mechanism (6). The power head (2) is arranged between the two hydraulic vertical lifting frames (3) and is used to drive the telescopic pull rod (5) to rotate. The upper support ring (11) is connected to the top of the hydraulic vertical lifting frame (3) through the oblique support rod (13). The winch (4) is arranged at one end of the lower support ring (12) and is connected to the telescopic pull rod (5) through a steel wire rope passing around the upper support ring (11). The telescopic pull rod (5) is connected to the drill bit mechanism (6). The drill mechanism (6) is a rock shield mechanism, which comprises an upper shell (611), a lower shell (612), a bearing (614), a screw pump (615), a transmission motor (616), a transmission mechanism (617) and a rock drill bit (618); the telescopic pull rod (5) is connected to the top of the upper shell (611); the upper shell (611) is rotatably connected to the lower shell (612) via the bearing (614); the transmission motor (616) is arranged in the upper shell (611); the transmission motor (616) drives the lower shell (612) to rotate via the transmission mechanism (617); the screw pump (615) passes through the bearing (614) to connect the upper shell (611) and the lower shell (612); the rock drill bit (618) is arranged at the bottom of the lower shell (612); the top of the upper shell (611) is provided with a reinforcing rib, and the reinforcing rib is connected to the telescopic pull rod (5); The screw pump (615) comprises a drainage motor (6151), a pump pipe (6152), a mud outlet (6153), a suction chamber (6154), a liquid leakage prevention cover (6155) and a water inlet pipe (6156). The drainage motor (6151) is arranged at the top of the pump pipe (6152). The pump pipe (6152) is connected to the mud outlet (6153). The mud outlet (6153) passes through the upper shell (611) to discharge mud outward. The pump pipe (6152) passes through the bearing (614) to communicate with the suction chamber (6154) arranged in the lower shell (612). The liquid leakage prevention cover (6155) is arranged on the upper shell (611). ) to form a leak-proof liquid cavity with the upper shell (611); the bearing (614) is arranged in the leak-proof liquid cavity; the water inlet pipe (6156) is sleeved on the pump pipe (6152); the water inlet pipe (6156) passes through the bearing (614) to connect the upper shell (611) and the lower shell (612); a water inlet (61561) is provided on the water inlet pipe (6156); the bottom end of the water inlet (61561) is connected to the upper end of the water inlet pipe (6156); the top end of the water inlet (61561) passes through the upper shell (611); clean water flows through the water inlet pipe (6156) through the water inlet (61561) and reaches the lower shell (612).

2. The pile foundation boring machine for building foundation engineering according to claim 1, characterized in that: The transmission mechanism (617) comprises a bracket (6171), a pinion (6172), a transmission bearing (6173) and an internal gear plate (6174); the bracket (6171) is arranged on the lower shell (612); the transmission bearing (6173) is arranged on the bracket (6171); the output shaft of the transmission motor (616) passes through the bottom end of the upper shell (611) and is connected to the transmission bearing (6173); the pinion (6172) is sleeved on the output shaft of the transmission motor (616); the internal gear plate (6174) is fixedly connected to the lower shell (612) and meshes with the pinion (6172); the pinion (6172) drives the lower shell (612) to rotate through the internal gear plate (6174).

3. The pile foundation boring machine for building foundation engineering according to claim 2, characterized in that: The rock drill bit (618) comprises a first drill bit (6181) and a second drill bit (6182), wherein the first drill bit (6181) is arranged at the center of the bottom end of the lower shell (612), and the second drill bit (6182) is arranged at the outer periphery of the lower shell (612).

4. The pile foundation boring machine for building foundation engineering according to claim 3, characterized in that: The bottom surface of the lower shell (612) is a conical structure with a central portion convex outwards. A slag discharge hole (6121) is provided on the bottom surface of the lower shell (612). A cutter disc (6122) is provided on the bottom surface of the lower shell (612). A plurality of roller cutter mechanisms (61221) are provided on the cutter disc (6122). The roller cutter mechanisms (61221) include a single-edged roller cutter (612211), a cutter shaft (612212) and an end cover (612213). There are a plurality of single-edged roller cutters (612211). The plurality of single-edged roller cutters (612211) are sleeved on the cutter shaft (612212). The end covers (612213) are provided on both sides of the single-edged roller cutter (612211).

5. The pile foundation boring machine for building foundation engineering according to claim 1, characterized in that: The drill mechanism (6) is a hole-reaming drill mechanism, comprising a drill body (621), an upper connecting seat (623), a hole-reaming arm (624) and an alloy drill bit (625); the drill body (621) comprises a shell (6211), a stop seat (6212), a chassis (6213) and a slag outlet (6214); the shell (6211) and the chassis (6213) form a accommodating space; the stop seat (6212) is arranged at the top of the shell (6211); the slag outlet (6214) is arranged on the chassis (6213); the telescopic pull rod (5) passes through the stop seat (6212) and the upper connecting seat (623) arranged in the accommodating space. ), the reaming arm (624) comprises an upper reaming arm (6241) and a lower reaming arm (6242), the upper reaming arm (6241) and the lower reaming arm (6242) are hinged to each other, the top end of the upper reaming arm (6241) is hinged to the upper connecting seat (623), the bottom end of the lower reaming arm (6242) is hinged to the shell (6211), a plurality of scrapers (62133) are provided on the lower reaming arm (6242), the alloy drill bit (625) is arranged at the center of the chassis (6213), and a spring (51) is sleeved on the telescopic pull rod (5), and the spring (51) is arranged between the limit seat (6212) and the upper connecting seat (623).

6. The pile foundation boring machine for building foundation engineering according to claim 5, characterized in that: The bottom end of the shell (6211) is provided with a lower connecting seat (62111), a lock (62112) and an unlocking pull rod (62113); the unlocking pull rod (62113) controls the switch of the lock (62112); a buckle (62131) is provided on the chassis (6213); the lower connecting seat (62111) is hinged to one end of the chassis (6213); the buckle (62131) is adapted to the lock (62112); a cutter disc (62132) is provided on the chassis (6213); a plurality of scrapers (62133) are provided on the cutter disc (62132); and the alloy drill bit (625) is arranged at the center of the cutter disc (62132).

7. The pile foundation boring machine for building foundation engineering according to claim 6, characterized in that: A sensor (62114) is provided in the housing (6211), and the sensor (62114) is electrically connected to the power head (2) and is used to sense the height of the soil loaded in the accommodating space.

8. The pile foundation boring machine for building foundation engineering according to claim 1, characterized in that: A plurality of hydraulic support legs (122) are provided at the bottom of the lower support ring (12) for supporting and fixing the position of the lower support ring (12); the hydraulic support legs (122) can be adjusted in height so as to facilitate the horizontal setting of the lower support ring (12); and a plurality of pull hooks (121) are provided on the lower support ring (12) for pulling the drill frame (1) to move.

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