One-time hole forming equipment for pile hole of sheet-pile wall

Abstract

The invention provides sheet-pile wall pile hole one-time hole forming equipment which comprises tunneling equipment and milling and excavating equipment, the tunneling equipment comprises a drill rod, a drilling power mechanism and a center drill bit connected to the bottom end of the drill rod, and the drilling power mechanism can drive the drill rod to move up and down and rotate. The milling and digging equipment comprises an equipment frame and a milling cutter assembly installed on the equipment frame, the equipment frame is fixed to the lower end of the drill rod through a bearing seat, the milling cutter assembly is located above the center drill bit and comprises a square hole forming cutter head and a bracket forming cutter head arranged on one side of the square hole forming cutter head, and the two cutter heads are matched to mill a T-shaped section hole. The bracket forming cutter head is used for milling the head part of a T-shaped section hole, the square hole forming cutter head is used for milling the rod part of the T-shaped section hole, during pile hole construction, the drilling power mechanism drives the center drill bit to rotationally drill downwards firstly, and then the milling cutter assembly is used for tunneling and excavating the T-shaped section hole. The T-shaped section pile hole can be excavated at a time, and the construction period is greatly shortened.

Description

Technical Field

[0001] This invention relates to the field of pile foundation construction technology, and in particular to a one-time hole-forming device for pile-slab wall. Background Technology

[0002] In the field of construction engineering, pile-slab walls, as an important foundation structure, are widely used in projects such as deep foundation pits and high slopes, undertaking key functions such as anti-sliding and load-bearing. The construction quality of the pile holes directly affects the overall performance and stability of the pile-slab wall, thus impacting the safety and quality of the entire project. Among various pile types, circular and square piles are the most common traditional types. Through long-term application, these two types have accumulated rich construction experience and formed relatively mature construction techniques and equipment systems. However, with the continuous expansion of project scale and the increasing complexity of geological conditions, the limitations of circular and square piles in certain specific engineering scenarios have gradually become apparent. For example, in projects requiring higher bearing capacity and better anti-sliding performance, traditional circular and square piles often fail to meet design requirements. Against this backdrop, T-shaped piles have emerged.

[0003] T-shaped piles, as a new type of pile, have significant advantages in mechanical performance. Under the conditions of uniform cross-section and material, the lateral friction area of ​​T-shaped piles is larger than that of circular and square piles. This increased lateral friction area significantly enhances the frictional force between the pile and the surrounding soil, thereby significantly increasing the pile's bearing capacity. This characteristic allows T-shaped piles to more effectively resist soil sliding in deep foundation pits and high slope engineering projects, providing more reliable anti-sliding stability, bearing greater superstructure loads, reducing the number of piles and foundation size, and lowering project costs. However, currently widely used tunneling equipment is mainly designed for the construction of circular or square piles, lacking efficient construction equipment specifically for drilling T-shaped piles. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention aims to provide a one-time drilling device for pile holes in pile-slab walls, which can complete the excavation of T-shaped cross-section pile holes in one go.

[0005] To achieve the above objectives, this invention proposes a one-time drilling device for pile-slab walls, comprising a tunneling device, which includes a drill rod, a drilling power mechanism, and a central drill bit connected to the bottom end of the drill rod. The drilling power mechanism can drive the drill rod to move up and down and rotate. It also includes a milling device, which includes an equipment frame and a milling cutter assembly mounted on the equipment frame. The equipment frame is fixed to the lower end of the drill rod via a bearing seat. The milling cutter assembly is located above the central drill bit and includes a square-hole forming cutter head and a bracket forming cutter head arranged on one side of the square-hole forming cutter head. The two cutter heads cooperate to mill a T-shaped cross-section hole. The bracket forming cutter head is used to mill the head of the T-shaped cross-section hole, and the square-hole forming cutter head is used to mill the rod portion of the T-shaped cross-section hole. During pile hole construction, the drilling power mechanism drives the central drill bit to rotate downwards and drill, and then the milling cutter assembly excavates the T-shaped cross-section hole.

[0006] In the above scheme: the cow-leg forming cutter head consists of two butterfly cutter heads, the two butterfly cutter heads are positioned to correspond to the two ends of the head of the T-shaped cross-section hole, and are arranged vertically. Their thickness is consistent with the design thickness of the head of the T-shaped cross-section hole. Each butterfly cutter head is equipped with a rotary motor at its center. The rotary motor is mounted on the equipment frame, thereby fixing the corresponding butterfly cutter head to the side of the equipment frame. The initial installation angle of the two butterfly cutter heads is vertical, and the left end of the right butterfly cutter head extends to the right waist of the left butterfly cutter head. The two rotary motors are used to drive the two butterfly cutter heads to rotate synchronously.

[0007] The unique layout allows the milling areas of the two butterfly cutter heads to connect and continuously cover each other during rotation, avoiding milling blind spots and ensuring that the head of the T-shaped section hole can be milled completely and evenly, thus improving the quality of the hole.

[0008] In the above scheme: the butterfly cutter head includes a butterfly cutter head body and a scraper. The butterfly cutter head body is formed by inward arc-shaped indentations from both ends of a circular disc, with the two arc-shaped indentations symmetrically arranged. The scraper is located at the remaining two ends of the butterfly cutter head body. The arc-shaped indentations form the waist of the butterfly cutter head, and the ends where the scrapers are located form the ends of the butterfly cutter head. The structural design of the butterfly cutter head is beneficial in ensuring continuous coverage of the milling area at the head.

[0009] In the above scheme: the cow-leg forming cutter head consists of three triangular cutter heads, which are positioned to correspond to the left, middle, and right ends of the head of the T-shaped cross-section hole, respectively. The three triangular cutter heads are arranged vertically, and their thickness is consistent with the design thickness of the head of the T-shaped cross-section hole. Each of the three triangular cutter heads is equipped with a rotary motor at its center. The rotary motor is mounted on the equipment frame, thereby fixing the corresponding triangular cutter head to the side of the equipment frame. The initial angles of the three triangular cutter heads are consistent, and the left end of the right triangular cutter head extends to the right waist of the middle triangular cutter head, and the left end of the middle triangular cutter head extends to the right waist of the left triangular cutter head. The three rotary motors are used to drive the three triangular cutter heads to rotate synchronously.

[0010] The unique layout allows the milling areas of the three cutter heads to connect and overlap during rotary milling, avoiding milling blind spots and enabling continuous seamless milling of the head of the T-shaped cross-section hole. This results in a smoother and flatter head surface, improving the quality of the hole.

[0011] In the above scheme: the triangular cutter head includes a triangular cutter head body and a scraper. The triangular cutter head body is formed by three inwardly curved recesses at the three ends of a circular disc, with the three curved recesses evenly distributed around the circumference. The scraper is located at the remaining three ends of the triangular cutter head body, with the curved recesses forming the waist of the triangular cutter head and the ends where the scrapers are located forming the ends of the triangular cutter head. This structural design of the triangular cutter head facilitates a nested layout of the three triangular cutter heads, thereby ensuring continuous coverage of the head milling area.

[0012] In the above scheme: the cow-leg forming cutter head consists of a single circular cutter head, positioned corresponding to the head of the T-shaped cross-section hole. The circular cutter head is vertically arranged, with its diameter and thickness matching the designed length and thickness of the head of the T-shaped cross-section hole. A rotary motor for driving its rotation is located at the center of the circular cutter head, and this motor is mounted on the side of the equipment frame, thus fixing the circular cutter head to the frame. Compared to a multi-cutter head combination, this single circular cutter head design significantly simplifies the overall structure of the cutter head. This not only reduces the number of parts and manufacturing costs but also eliminates the need to consider coordination and matching issues between multiple cutter heads, as is the case with multi-cutter head structures. However, the disadvantage is that it requires excessive driving force.

[0013] In the above scheme: the square hole forming cutter head consists of several rolling cutters arranged in a rectangular array. The rolling cutters are arranged vertically, and each rolling cutter is equipped with a rotary motor at its center. The rotary motor is mounted on the equipment frame, thereby fixing the corresponding rolling cutter to the bottom surface of the equipment frame. The simultaneous operation of the several rolling cutters arranged in a rectangular array is equivalent to multiple cutting units simultaneously constructing the soil layer, greatly improving the cutting speed and significantly enhancing the overall construction efficiency.

[0014] In the above scheme: the drill rod is a hollow structure with open ends, the center drill bit is a rotary drilling center drill bit, the upper end of the center drill bit is fixed to the inner wall of the lower end of the drill rod by a cross, the drill rod passes through the center of the square hole forming cutter head, and the diameter of the center drill bit is less than or equal to the width of the square hole forming cutter head.

[0015] The central drill bit first rotates and drills to create a circular pile hole, forming a free surface to release stress. Then, the square hole forming cutter head follows and mills to form the rod part of the T-shaped cross-section hole. At the same time, the bracket forming cutter head follows and mills to form the head of the T-shaped cross-section hole. The two cutter heads work together to achieve the formation of the T-shaped cross-section hole, which is safe, can achieve one-time forming, and has good economic benefits.

[0016] The above scheme also includes a slag removal device, which includes a chain bucket elevator installed inside the drill rod. The central drill bit is positioned ahead of the chain bucket elevator. The chain bucket elevator is fixed to the inner wall of the drill rod by several cross-shaped supports. The upper end of the chain bucket elevator extends outward horizontally from the drill rod. A slag collection bin is connected to the upper end of the drill rod via a bearing seat. The slag collection bin is a cavity structure that encloses the upper end of the drill rod and the horizontal section of the chain bucket elevator. Its interior surrounds the drill rod. The slag discharge trough is spiral-shaped, with the upper end being the feed end and the lower end being the discharge end. The end of the horizontal section of the chain bucket elevator extends outward into the feed end of the slag discharge trough. The discharge end of the slag discharge trough is connected to a discharge pipe, which passes through the slag and soil collection bin and extends to the ground. When the drilling power mechanism drives the drill rod to rotate and move forward, the chain bucket elevator can follow the rotation and move forward, and automatically transport the slag and soil to the slag and soil collection bin through its buckets, and then transport it to the ground through the discharge pipe.

[0017] The chain bucket elevator is installed inside the drill rod and rotates synchronously with it. While the central drill bit is drilling and producing excavated soil, the buckets of the chain bucket elevator automatically and continuously transport the soil to the excavated soil collection bin, and then to the ground via the discharge pipe. This achieves simultaneous drilling and excavation, greatly reducing construction interruption time and significantly improving excavation efficiency. 2. The chain bucket elevator, through its circulating buckets, can quickly lift the excavated soil from the bottom of the hole to the excavated soil collection bin. The spiral discharge chute inside the collection bin allows the soil to move smoothly from the feed end to the discharge end under gravity and spiral guidance, and is quickly discharged to the ground through the discharge pipe. This avoids soil accumulation and blockage inside the equipment, further accelerating the soil transfer speed and improving overall excavation efficiency. 3. The bucket elevator's buckets can automatically scoop up and transport slag. The slag is automatically discharged from the slag collection bin via a spiral discharge chute. The entire slag discharge process is highly automated, reducing manual intervention and lowering the workload and labor intensity of operators. 4. The use of a closed slag collection bin and discharge pipe ensures that the slag is transported and discharged within a relatively enclosed space, effectively reducing dust dispersion.

[0018] In the above scheme: the chain bucket elevator also includes a frame, a drive device, and a traction chain. The frame is fixed to the inner wall of the drill rod by several vertically arranged crosses. The traction chain is laid on the frame and turns at the junction of the horizontal and vertical sections by rollers. The drive device is used to drive the traction chain to run in a cycle. There are multiple buckets, which are connected to the traction chain in sequence. The buckets have a bowl-shaped structure and are arranged at an incline. The side closer to the traction chain is lower, and the side farther away from the traction chain is higher.

[0019] As the bucket elevator rotates with the drill rod, the slag in the bucket will be thrown backward due to centrifugal force. This inclined bowl-shaped design can, on the one hand, increase the holding volume of the bucket, allowing it to hold more material when scooping slag and increasing the amount of slag lifted in a single operation; on the other hand, its unique inclination angle can cleverly counteract some of the centrifugal force, allowing the slag to have a more stable position in the bucket, effectively reducing the spillage of slag during the lifting process, ensuring that the slag can be accurately and efficiently lifted to the designated position, thus improving the slag discharge efficiency and operating quality of the elevator.

[0020] The beneficial effects of this invention are:

[0021] 1. Traditional T-shaped pile hole construction may require step-by-step excavation. This equipment, through the coordinated operation of drilling and milling equipment, can complete the excavation of the T-shaped section pile hole in one go, avoiding tedious procedures such as multiple equipment changes and repositioning, significantly shortening the construction cycle and improving overall construction efficiency. 2. The drilling power mechanism first drives the central drill bit downwards to provide guidance and foundation for the subsequent milling cutter assembly operation, creating a free surface to release stress. Immediately afterwards, the milling cutter assembly rapidly excavates the T-shaped section hole. The entire process is smooth and continuous, reducing waiting time between processes, further improving construction efficiency, and also reducing the time and frequency of workers operating in hazardous environments, thus improving construction safety. 3. The milling cutter assembly features a clearly defined division of labor between the square hole forming cutter head and the bracket forming cutter head, respectively responsible for milling the shaft and head of the T-shaped section hole. This specially designed cutter head combination allows for more precise control of the hole shape and size, ensuring the forming quality of the T-shaped section hole. Furthermore, the two cutter heads operate stably and reliably without interfering with each other. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention.

[0023] Figure 2 yes Figure 1 Side view.

[0024] Figure 3 This is a schematic diagram of the butterfly cutter disc.

[0025] Figure 4 This is a schematic diagram of the triangular cutter head.

[0026] Figure 5 This is a schematic diagram of the structure of a circular cutter head.

[0027] Figure 6 This is a schematic diagram of the layout of a chain bucket elevator.

[0028] Figure 7 This is a schematic diagram of the internal structure of the waste disposal silo.

[0029] Figure 8 This is a schematic diagram of the roller layout. Detailed Implementation

[0030] like Figure 1 As shown in Figure 8, a one-time drilling equipment for pile-slab walls includes a tunneling device, a milling device, and a slag removal device. The tunneling device includes a drill rod 1, a drilling power mechanism 2, and a central drill bit 3 connected to the bottom end of the drill rod 1. The drilling power mechanism 2 can drive the drill rod 1 to move up and down and rotate.

[0031] The milling equipment includes an equipment frame 4 and a milling cutter assembly mounted on the equipment frame 4. The equipment frame 4 is fixed to the lower end of the drill rod 1 via a bearing seat, and the milling cutter assembly is located above the central drill bit 3. The milling cutter assembly includes a square-hole forming cutter head 5 and a bracket forming cutter head 6 arranged on one side of the square-hole forming cutter head 5. The two cutter heads work together to mill a T-shaped cross-section hole. The bracket forming cutter head 6 is used to mill the head of the T-shaped cross-section hole, and the square-hole forming cutter head 5 is used to mill the rod part of the T-shaped cross-section hole. During pile hole construction, the drilling power mechanism 2 drives the central drill bit 3 to rotate downwards and drill, and then the milling cutter assembly excavates the T-shaped cross-section hole.

[0032] Ideally, the beak-shaped cutting head 6 consists of two butterfly cutting heads 7. The positions of the two butterfly cutting heads 7 correspond to the two ends of the head of the T-shaped cross-section hole, and they are arranged vertically. Their thickness is consistent with the design thickness of the head of the T-shaped cross-section hole. Each butterfly cutting head 7 is equipped with a rotary motor at its center. The rotary motor is mounted on the equipment frame, thereby fixing the corresponding butterfly cutting head 7 to the side of the equipment frame. The initial installation angle of the two butterfly cutting heads 7 is vertical, and the left end of the right butterfly cutting head 7 extends to the right waist of the left butterfly cutting head 7. The two rotary motors are used to drive the two butterfly cutting heads 7 to rotate synchronously.

[0033] The unique layout allows the milling areas of the two butterfly cutter heads 7 to connect and continuously cover each other during rotation, avoiding milling blind spots and ensuring that the head of the T-shaped section hole can be milled completely and evenly, thus improving the quality of the hole.

[0034] Ideally, the butterfly cutter head 7 comprises a butterfly cutter head body and a scraper. The butterfly cutter head body is formed by inward arc-shaped indentations from both ends of a circular disc, with the two arc-shaped indentations symmetrically arranged. The scraper is located at the remaining two ends of the butterfly cutter head body. The arc-shaped indentations form the waist of the butterfly cutter head 7, and the ends where the scrapers are located form the ends of the butterfly cutter head 7. The structural design of the butterfly cutter head 7 is conducive to ensuring continuous coverage of the head milling area.

[0035] Ideally, the beak-shaped cutting head 6 consists of three triangular cutting heads 8. The three triangular cutting heads 8 are positioned to correspond to the left, middle, and right ends of the head of the T-shaped cross-section hole, respectively. The three triangular cutting heads 8 are arranged vertically, and their thickness is consistent with the design thickness of the head of the T-shaped cross-section hole. Each of the three triangular cutting heads 8 is equipped with a rotary motor at its center. The rotary motor is mounted on the equipment frame 4, thereby fixing the corresponding triangular cutting head 8 to the side of the equipment frame 4. The initial angles of the three triangular cutting heads 8 are consistent, and the left end of the right triangular cutting head 8 extends to the right waist of the middle triangular cutting head 8, and the left end of the middle triangular cutting head 8 extends to the right waist of the left triangular cutting head 8. The three rotary motors are used to drive the three triangular cutting heads 8 to rotate synchronously.

[0036] The unique layout allows the milling areas of the three cutter heads 8 to connect and overlap during rotary milling, avoiding milling blind spots and achieving continuous seamless milling of the head of the T-shaped cross-section hole. This makes the head surface smoother and improves the quality of the hole.

[0037] Ideally, the triangular cutter head 8 includes a triangular cutter head body and a scraper. The triangular cutter head body is formed by three inwardly curved recesses at the three ends of a circular disc, with the three curved recesses evenly distributed around the circumference. The scraper is located at the remaining three ends of the triangular cutter head body. The curved recesses form the waist of the triangular cutter head 8, and the ends where the scrapers are located form the ends of the triangular cutter head 8. This structural design of the triangular cutter head 8 facilitates a nested layout of the three triangular cutter heads 8, thereby ensuring continuous coverage of the head milling area.

[0038] Ideally, the beak-shaped cutter head 6 consists of a single circular cutter head 9. The circular cutter head 9 is positioned corresponding to the head of the T-shaped section hole, and is vertically arranged. Its diameter and thickness are consistent with the designed length and thickness of the head of the T-shaped section hole. A rotary motor for driving its rotation is located at the center of the circular cutter head 9. The rotary motor is mounted on the side of the equipment frame 4, thus fixing the circular cutter head 9 to the equipment frame 4. Compared to a structure combining multiple cutter heads, the design of a single circular cutter head 9 greatly simplifies the overall structure of the cutter head. This not only reduces the number of parts in the equipment and lowers manufacturing costs, but also eliminates the need to consider the coordination and matching issues between multiple cutter heads as in a multi-cutter head structure. However, the disadvantage is that the required driving force is too large.

[0039] Ideally, the square-hole forming cutter head 5 consists of several rolling cutters 10 arranged in a rectangular array. The rolling cutters 10 are vertically arranged, and each rolling cutter 10 is equipped with a rotary motor at its center. The rotary motor is mounted on the equipment frame 4, thereby fixing the corresponding rolling cutter 10 to the bottom surface of the equipment frame 4. The simultaneous operation of the several rolling cutters 10 arranged in a rectangular array is equivalent to multiple cutting units simultaneously constructing the soil layer, greatly improving the cutting speed and significantly enhancing the overall construction efficiency.

[0040] Ideally, the drill rod 1 is a hollow structure with open ends, the center drill bit 3 is a rotary drilling center drill bit, the upper end of the center drill bit 3 is fixed to the inner wall of the lower end of the drill rod 1 by a cross, the drill rod 1 passes through the center of the square hole forming cutter head 9, and the diameter of the center drill bit 3 is less than or equal to the width of the square hole forming cutter head 9.

[0041] The central drill bit 3 first rotates and drills to create a circular pile hole, forming a free surface to release stress. Then, the square hole forming cutter head 5 follows and mills to form the rod part of the T-shaped cross-section hole. At the same time, the bracket forming cutter head 6 follows and mills to form the head of the T-shaped cross-section hole. The two cutter heads work together to achieve the formation of the T-shaped cross-section hole, which is safe, can achieve one-time forming, and has good economic benefits.

[0042] Ideally, it should also include a slag removal device, which includes a chain bucket elevator 11 installed inside the drill rod 1. The central drill bit 3 is positioned ahead of the chain bucket elevator 11. The chain bucket elevator 11 is fixed to the inner wall of the drill rod 1 by several crosses. The upper end of the chain bucket elevator 11 extends outward horizontally from the drill rod. The upper end of the drill rod 1 is connected to a slag collection bin 12 via a bearing seat. The slag collection bin 12 is a cavity structure that encloses the upper end of the drill rod 1 and the horizontal section of the chain bucket elevator 11. A spiral is formed inside the bin around the drill rod 1. The slag discharge trough 13 is shaped like a feed end at the top and a discharge end at the bottom. The end of the horizontal section of the chain bucket elevator 11 extends outward into the feed end of the slag discharge trough 13. The discharge end of the slag discharge trough 13 is connected to a discharge pipe 14, which passes through the slag and soil collection bin 12 and extends to the ground. When the drilling power mechanism 2 drives the drill rod 1 to rotate and move forward, the chain bucket elevator 11 can follow the rotation and move forward, and automatically transport the slag and soil to the slag and soil collection bin 12 through its bucket 15, and then transport it to the ground through the discharge pipe 14.

[0043] The chain bucket elevator 11 is installed inside the drill rod 1 and can rotate and advance synchronously with the drill rod 1. While the central drill bit 3 is drilling and producing slag, the buckets 15 of the chain bucket elevator 11 can automatically and continuously transport the slag to the slag collection bin 12, and then transport it to the ground through the discharge pipe 14. This realizes the synchronization of drilling and slag discharge, greatly reducing construction interruption time and significantly improving slag discharge efficiency. 2. The chain bucket elevator 11, through its circulating buckets 15, can quickly lift the slag at the bottom of the hole to the slag collection bin 12. The spiral slag discharge chute 13 set in the slag collection bin 12 allows the slag to move smoothly from the feed end to the discharge end under the action of gravity and spiral guidance, and is quickly discharged to the ground through the discharge pipe 14. This avoids the accumulation and blockage of slag inside the equipment, further speeding up the transfer speed of slag and improving the overall slag discharge efficiency. 3. The bucket 15 of the chain bucket elevator 11 can automatically scoop up and lift the slag, which is then automatically discharged from the slag collection bin 12 via the spiral slag discharge chute 13. The entire slag discharge process is highly automated, reducing manual intervention and lowering the workload and labor intensity of operators. 4. The use of a closed slag collection bin 12 and discharge pipe 14 transports and discharges the slag in a relatively enclosed space, effectively reducing the spread of dust.

[0044] It should be noted that the bucket elevator 11 should not interfere with the drilling power mechanism 2 when it is installed; the two can be staggered. The slag collection bin 12 and the equipment frame 4 are both fixed to the drill rod 1 by bearing seats, so they do not rotate with the drill rod 1.

[0045] Preferably, the chain bucket elevator 11 also includes a frame, a drive unit, and a traction chain. The frame is fixed to the inner wall of the drill rod 1 by several vertically arranged crosses. The traction chain is laid on the frame. The traction chain is turned by rollers 16 at the junction of the horizontal and vertical sections (specifically, at the turning position, rollers 16 are set on both sides of the traction chain for constraint, and the buckets 15 pass through the middle). The drive unit is used to drive the traction chain to run in a cycle. There are multiple buckets 15, which are connected to the traction chain in sequence. The buckets 15 have a bowl-shaped structure and are arranged at an angle, with the side closer to the traction chain being lower and the side farther away from the traction chain being higher.

[0046] As the chain bucket elevator 11 rotates following the drill rod 1, the slag in the bucket 15 will be thrown backward due to centrifugal force. This inclined bowl-shaped design can, on the one hand, increase the holding volume of the bucket 15, allowing it to hold more material when scooping slag and increasing the amount of slag lifted in a single operation; on the other hand, its unique inclination angle can cleverly counteract part of the centrifugal force, allowing the slag to have a more stable position in the bucket 15, effectively reducing the spillage of slag during the lifting process, ensuring that the slag can be accurately and efficiently lifted to the designated position, and improving the slag discharge efficiency and operating quality of the elevator.

Claims

1. A one-time hole-forming device for pile holes of a pile wall, comprising a boring device, the boring device comprising a drill rod (1), a drilling power mechanism (2) and a center drill bit (3) connected to the bottom end of the drill rod (1), the drilling power mechanism (2) being capable of driving the drill rod (1) to move up and down and rotate, characterized in that: The application also relates to a milling and digging device, which comprises a device frame (4) and a milling cutter assembly mounted on the device frame (4), the device frame (4) is fixed to the lower end of a drill rod (1) through a bearing seat, the milling cutter assembly is located above a center drill bit (3), the milling cutter assembly comprises a square hole forming cutter head (5) and a bracket forming cutter head (6) arranged on one side of the square hole forming cutter head (5), the two cutter heads are used for milling a T-shaped cross-section hole, the bracket forming cutter head (6) is used for milling the head of the T-shaped cross-section hole, and the square hole forming cutter head (5) is used for milling the rod of the T-shaped cross-section hole; during pile hole construction, the center drill bit (3) is first rotated and drilled downward by a drilling power mechanism (2), and then the T-shaped cross-section hole is excavated by the milling cutter assembly.

2. A pile wall post hole one-time hole forming apparatus according to claim 1, characterized by: The bracket forming cutter head (6) is composed of two butterfly cutter heads (7), the two butterfly cutter heads (7) are arranged at positions corresponding to the two ends of the head of the T-shaped cross-section hole in a vertical arrangement mode, the thicknesses of the two butterfly cutter heads (7) are consistent with the designed thicknesses of the head of the T-shaped cross-section hole, the centers of the two butterfly cutter heads (7) are respectively provided with rotating motors, the rotating motors are mounted on the device frame, so that the corresponding butterfly cutter heads (7) are fixed to the side surface of the device frame, the initial installation angles of the two butterfly cutter heads (7) are perpendicular, and the left end of the right butterfly cutter head (7) extends to the right waist position of the left butterfly cutter head (7), and the two rotating motors are used for driving the two butterfly cutter heads (7) to synchronously rotate.

3. A pile wall post hole one-time hole forming apparatus according to claim 2, characterized by: The butterfly cutter head (7) comprises a butterfly cutter head main body and a scraper, the butterfly cutter head main body is formed by inwardly recessing the edges of the two ends of a circular disc in an arc shape, the two arc recesses are symmetrically arranged, and the scraper is arranged on the remaining two end heads of the butterfly cutter head main body, the arc recesses form the waist of the butterfly cutter head (7), and the end heads where the scrapers are arranged form the ends of the butterfly cutter head (7).

4. The pile wall post hole one-time hole forming apparatus according to claim 1, characterized by: The bracket forming cutter head (6) is composed of three sets of triangular cutter heads (8), the three sets of triangular cutter heads (8) are arranged at positions corresponding to the left, middle and right ends of the head of the T-shaped cross-section hole in a vertical arrangement mode, the thicknesses of the three sets of triangular cutter heads (8) are consistent with the designed thicknesses of the head of the T-shaped cross-section hole, the centers of the three sets of triangular cutter heads (8) are respectively provided with rotating motors, the rotating motors are mounted on the device frame (4), so that the corresponding triangular cutter heads (8) are fixed to the side surface of the device frame (4), the initial angles of the three sets of triangular cutter heads (8) are consistent, the left end of the right triangular cutter head (8) extends to the right waist position of the middle triangular cutter head (8), the left end of the middle triangular cutter head (8) extends to the right waist position of the left triangular cutter head (8), and the three rotating motors are used for driving the three sets of triangular cutter heads (8) to synchronously rotate.

5. A pile wall post hole one-time hole forming apparatus according to claim 4, characterized by: The triangular cutter head (8) comprises a triangular cutter head main body and a scraper, the triangular cutter head main body is formed by inwardly recessing the edges of the three ends of a circular disc in an arc shape, the three arc recesses are circumferentially arranged, the scraper is arranged on the remaining three end heads of the triangular cutter head main body, the arc recesses form the waist of the triangular cutter head (8), and the end heads where the scrapers are arranged form the ends of the triangular cutter head (8).

6. The pile wall post hole one-time hole forming apparatus according to claim 1, characterized by: The bracket forming cutter head (6) is composed of a single circular cutter head (9), the layout position of the circular cutter head (9) corresponds to the head position of the T-shaped cross-section hole, and the circular cutter head (9) is vertically arranged, the diameter of the circular cutter head (9) is consistent with the design length of the head of the T-shaped cross-section hole, the thickness of the circular cutter head (9) is consistent with the design thickness of the head of the T-shaped cross-section hole, the center of the circular cutter head (9) is provided with a rotary motor for driving the rotation of the circular cutter head (9), and the rotary motor is mounted on the side of the equipment rack (4), so that the circular cutter head (9) is fixed on the equipment rack (4).

7. The pile wall post hole one-time hole forming apparatus according to claim 1, characterized by: The square hole forming cutter head (5) is composed of a plurality of rolling cutters (10) arranged in a rectangular array, the rolling cutters (10) are vertically arranged, and the center of each rolling cutter (10) is provided with a rotary motor, and the rotary motor is mounted on the equipment rack (4), so that the corresponding rolling cutter (10) is fixed on the bottom surface of the equipment rack (4).

8. A pile wall post hole one-time hole forming apparatus according to claim 7, characterized by: The drill rod (1) is a hollow structure with both ends open, the center drill bit (3) is a rotary excavating center drill bit, the upper end of the center drill bit (3) is fixed to the inner wall of the lower end of the drill rod (1) through a cross frame, the drill rod (1) passes through the center of the square hole forming cutter head (9), and the diameter of the center drill bit (3) is less than or equal to the width of the square hole forming cutter head (9).

9. A pile wall post hole one-time hole forming apparatus according to claim 8, characterized by: Further comprising a slag discharging device, the slag discharging device comprises a chain bucket elevator (11) arranged inside the drill rod (1), the center drill bit (3) is ahead of the chain bucket elevator (11), the chain bucket elevator (11) is fixed to the inner wall of the drill rod (1) through a plurality of cross frames, the upper end of the chain bucket elevator (11) extends out of the drill rod, and extends horizontally and outward, the upper end of the drill rod (1) is connected with a slag storage bin (12) through a bearing seat, the slag storage bin (12) is a cavity structure for closing the upper end of the drill rod (1) and the horizontal section of the chain bucket elevator (11), a spiral slag discharging groove (13) is formed around the drill rod (1) in the slag storage bin (12), the upper end of the slag discharging groove (13) is a feeding end, and the lower end is a discharging end, the end of the horizontal section of the chain bucket elevator (11) extends outward into the feeding end of the slag discharging groove (13), the discharging end of the slag discharging groove (13) is connected with a discharging pipe (14), the discharging pipe (14) penetrates the slag storage bin (12) and extends to the ground, when the drilling power mechanism (2) drives the drill rod (1) to rotate and advance, the chain bucket elevator (11) can follow the rotation and advancement, and automatically convey the slag into the slag storage bin (12) through the hopper (15) thereof, and then convey the slag to the ground through the discharging pipe (14).

10. The pile wall post hole one-time hole forming apparatus according to claim 9, characterized by: The chain bucket elevator (11) further comprises a rack, a driving device and a traction chain, the rack is fixed to the inner wall of the drill rod (1) through a plurality of vertically arranged cross frames, the traction chain is arranged on the rack, the traction chain is turned at the junction of the horizontal section and the vertical section through a roller (16), the driving device is used to drive the traction chain to circulate, and the hopper (15) has a plurality of hoppers connected to the traction chain in sequence, the hopper (15) is in the shape of a bowl and is arranged obliquely, wherein one side close to the traction chain is low, and the side far away from the traction chain is high.

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