Stiff composite pile construction process and construction pile machine for synchronously planting piles by using pile casing drill rod

Abstract

The invention relates to the technical field of stiff composite pile construction, in particular to a stiff composite pile construction technology and pile construction machine for synchronous pile planting through a pile casing drill rod, the stiff composite pile construction technology comprises a crawler, a pressurization traction guide rail, a power head and the like, the pressurization traction guide rail is installed on the crawler, and the power head is installed on a sliding block of the pressurization traction guide rail. The opening and closing drilling plate can be driven by the pressurizing traction guide rail to move downwards, the opening and closing drilling plate drills holes in the ground, and the precast concrete pile moves downwards along with the steel casing drilling rod, so that the steel casing drilling rod and the precast concrete pile synchronously reach the set depth, the conditions of hole shrinkage and hole collapse are avoided, it is ensured that mortar can form an effective hole wall, and the construction efficiency is improved. Therefore, non-centering and eccentricity of the precast concrete pile can be avoided, the pile planting process can be completed through one device, the construction efficiency can be improved, and the manufacturing cost can be reduced.

Description

Technical Field

[0001] This invention relates to the field of reinforced composite pile construction technology, and in particular to a reinforced composite pile construction process and construction pile machine that uses a casing drill rod for synchronous pile planting. Background Technology

[0002] The core of constructing rigid composite piles lies in how to efficiently implant precast concrete piles into cement-soil outer piles. After each cement-soil outer pile is mixed, a precast concrete pile is immediately implanted to ensure that the inner and outer piles work together to bear the load. Through engineering practice and innovation in recent years, a mature technical approach has been developed.

[0003] In actual construction, drilling and mixing and pile driving are completed separately by two or more sets of construction equipment, resulting in low construction efficiency and high cost. Moreover, loose sand layers, fluid mud layers, and thick gravel layers are prone to hole shrinkage and collapse, making it difficult for the cement slurry mixed with the grout to form an effective hole wall. When precast concrete piles are implanted, the precast concrete piles are prone to being out of center and eccentric. Summary of the Invention

[0004] In view of this, the present invention provides a construction process and construction pile machine for synchronous pile driving using a casing drill rod, which can overcome the disadvantages of drilling, mixing and pile driving being completed separately by two or more sets of construction equipment, resulting in low construction efficiency, high cost, and the tendency for hole shrinkage and collapse to occur in soft sand layers, fluid mud layers and thick gravel layers, which leads to the precast concrete piles being prone to being out of center and eccentric.

[0005] A construction process and pile driver for synchronous pile driving using a casing drill rod includes a tracked vehicle, a pressure-driven guide rail, and a power head. The tracked vehicle is equipped with the pressure-driven guide rail, and the power head is mounted on the slider of the pressure-driven guide rail. The system also includes a steel casing drill rod, hydraulic jacks, a hinged shaft, a hinged drill plate, a winch, a wire rope, a precast concrete pile, a shotcrete mechanism, and a guiding mechanism. Hydraulic jacks are evenly spaced around the power head's outer circumference. Hinges are evenly spaced around the lower part of the steel casing drill rod, and hinged drill plates are connected to each hinge. Adjacent hinged drill plates contact each other to form a complete hinged drill bit. A winch is mounted on the pressure-driven guide rail, and a wire rope is wound around the winch. A precast concrete pile is connected to the wire rope and is located inside the steel casing drill rod. The hinged drill plate drills holes in the ground. The shotcrete mechanism injects mortar into the holes to form a cement-soil external pile. The guiding mechanism guides the wire rope.

[0006] To further explain, the shotcrete mechanism includes a hollow rotary shotcrete head, a connector, and a female drive sleeve. The hollow rotary shotcrete head is installed at the bottom of the power head. Vertical grooves are opened on the steel casing drill rod, and shotcrete nozzles are opened on both the opening and closing drill plates. The vertical grooves and shotcrete nozzles correspond to each other. A connector is connected to the steel casing drill rod, and the connector communicates with the vertical groove. The female drive sleeve is installed at the bottom of the hollow rotary shotcrete head.

[0007] To further explain, the guiding mechanism includes a stepper motor, a gearbox, a rotating shaft, a rotating plate, guide wheels, and bushings. A stepper motor is mounted on the top of the pressure-traction guide rail. The output shaft of the stepper motor is connected to the input end of the gearbox. A rotating shaft is rotatably connected to the gearbox. The lower end of the rotating shaft is rotatably connected to the top of the pressure-traction guide rail. A rotating plate is connected to the upper end of the rotating shaft. Guide wheels for guiding the wire rope are rotatably connected to both sides of the rotating plate. The wire rope passes around the guide wheels. A bushing for supporting the rotating shaft is connected to the top of the gearbox. The rotating shaft is located inside the bushing, and the rotating shaft and the bushing are rotatably connected.

[0008] To further explain, it also includes a bottom-expanding mechanism, which includes a bottom-expanding drill bit and a limiting block. The bottom-expanding drill bit is hinged at even intervals around the lower part of the steel casing drill rod, and the limiting block is connected at even intervals around the lower part of the steel casing drill rod to limit the bottom-expanding drill bit.

[0009] To further explain, it also includes a stirring cutter. The stirring cutter is connected to the lower part of the steel casing drill rod and is located above the underreaming drill bit.

[0010] To further explain, it also includes a conical plate, with the top of the power head connected to the conical plate.

[0011] This invention also provides a construction process for rigid composite piles using a casing drill rod for synchronous pile driving, comprising the following steps: S1: The workers lift the steel casing drill rod from bottom to top by hoisting, insert the male drive key at the top of the steel casing drill rod into the female drive sleeve from bottom to top, then connect the hollow rotary shotcrete and the connector, and then connect the hollow rotary shotcrete to the shotcrete equipment. S2: Move the entire equipment to the construction site using a tracked vehicle, and then control the output shaft of the servo motor to rotate, adjusting the opening and closing drill plate to the closed state; S3: Start the stepper motor to drive the wire rope to rotate, move the wire rope away from directly above the steel casing drill rod, then fix the precast concrete pile on the wire rope, start the stepper motor again to drive the wire rope to reverse, rotate the precast concrete pile to directly above the steel casing drill rod, control the winch to release the wire rope, and the precast concrete pile moves downward into the steel casing drill rod under its own weight and contacts the opening and closing drill plate. The precast concrete pile is clamped by the hydraulic top clamp, and then the wire rope and the precast concrete pile are separated. S4: Control the power head to rotate forward, driving the steel casing drill rod and the opening and closing drill plate to rotate forward. At the same time, control the pressure traction guide rail to drive the opening and closing drill plate to move downward under pressure, and the opening and closing drill plate drills a hole on the ground. S5: Control the shotcrete equipment to inject mortar into the hollow rotary shotcrete machine. The mortar is sprayed out from the spray nozzle through the vertical groove and sprayed into the hole to form a cement-soil external pile. At this time, the stirring blade fully mixes the mortar and soil. The precast concrete pile moves downward together with the steel casing drill rod, so that the steel casing drill rod and the precast concrete pile reach the set depth synchronously. S6: After the steel casing drill rod and the precast concrete pile reach the set depth, the hydraulic jack releases the precast concrete pile. The precast concrete pile pushes the opening and closing drill plate, which rotates and opens in a direction away from each other, lifting the steel casing drill rod and the opening and closing drill plate upwards by 20 centimeters. The precast concrete pile stays in the hole, and the hydraulic jack clamps the precast concrete pile again. Then the power head presses down on the precast concrete pile, and then the hydraulic jack releases the precast concrete pile. S7: Control the output shaft of the drive motor to reverse, which will drive the steel casing drill rod and the opening and closing drill plate to reverse. The bottom expansion drill bit will automatically open to carry out the bottom expansion operation. During this process, grouting will continue. At the same time, control the pressure traction guide rail to drive the steel casing drill rod and the opening and closing drill plate to move slowly upward, push out the steel casing drill rod, and rotate and mix the soil and mortar. S8: After the bottom expansion requirement is met, the steel casing drill rod continues to rotate forward, the bottom expansion drill bit will automatically close, the steel casing drill rod and the opening and closing drill plate will continue to move slowly upward, pushing the steel casing drill rod out and rotating and mixing the soil and mortar. During this process, grouting will continue. When the steel casing drill rod and the opening and closing drill plate are removed from the hole, the pressure traction guide rail will stop running, the steel casing drill rod and the opening and closing drill plate will stop rotating, the grouting equipment will stop grouting, and the construction will be completed.

[0012] The beneficial effects are as follows: 1. The present invention can drive the opening and closing drill plate to move downward by applying pressure to the guide rail. The opening and closing drill plate drills holes on the ground, and the precast concrete pile moves downward together with the steel casing drill rod, so that the steel casing drill rod and the precast concrete pile reach the set depth synchronously, avoiding the occurrence of hole shrinkage and hole collapse, and ensuring that the mortar can form an effective hole wall. This can prevent the precast concrete pile from being out of center or eccentric. Moreover, one piece of equipment can complete the pile planting process, which can improve construction efficiency and reduce cost.

[0013] 2. The steel casing drill rod can drive the underreaming drill bit to rotate, and the underreaming drill bit can carry out underreaming operations, so that the mortar and soil are fully mixed and fully integrated with the precast concrete pile, thereby increasing the pile diameter and increasing the pile body friction resistance. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is a three-dimensional structural diagram of the power head and hydraulic clamp of the present invention.

[0016] Figure 3 This is a three-dimensional structural diagram of the steel casing drill rod, opening and closing shaft, and opening and closing drill plate of the present invention.

[0017] Figure 4 This is a diagram showing the state of the opening and closing drill plate of the present invention after it has been opened.

[0018] Figure 5 This is a three-dimensional structural diagram of the hollow rotary shotcrete device and the female drive sleeve of the present invention.

[0019] Figure 6 This is a three-dimensional structural diagram of the connector of the present invention.

[0020] Figure 7 This is a three-dimensional structural diagram of the opening and closing drill plate of the present invention.

[0021] Figure 8 This is a three-dimensional structural diagram of the guiding mechanism of the present invention.

[0022] Figure 9 This is a three-dimensional structural diagram of the base expansion mechanism of the present invention.

[0023] Figure 10 This is a diagram showing the state of the expanded bottom drill bit of the present invention after it has been opened.

[0024] The markings in the attached diagram are as follows: 1. Tracked vehicle; 2. Pressure traction guide rail; 3. Power head; 4. Steel casing drill rod; 5. Hydraulic jack; 6. Opening and closing shaft; 7. Opening and closing drill plate; 8. Winch; 9. Wire rope; 10. Precast concrete pile; 121. Hollow rotary shotcrete device; 122. Vertical groove; 123. Shotcrete nozzle; 124. Joint; 125. Female drive sleeve; 131. Stepper motor; 132. Gearbox; 133. Rotary shaft; 134. Rotating plate; 135. Guide wheel; 136. Bushing; 141. Underreaming drill bit; 142. Limiting block; 15. Stirring blade; 16. Conical plate. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0026] like Figures 1-8As shown, a construction process and pile driver for synchronous pile driving using a casing drill rod includes a tracked vehicle 1, a pressure-driven guide rail 2, a power head 3, a steel casing drill rod 4, a hydraulic jack 5, a hinged shaft 6, a hinged drill plate 7, a winch 8, a wire rope 9, a precast concrete pile 10, a shotcrete mechanism, and a guiding mechanism. The pressure-driven guide rail 2 is bolted to the left side of the tracked vehicle 1. The power head 3 is bolted to the left side of the slider of the pressure-driven guide rail 2. Hydraulic jacks 5 are evenly spaced around the outside of the power head 3. The steel casing drill rod 4 is lowered... The circumferentially evenly spaced opening and closing shafts 6 are bolted together, and each opening and closing shaft 6 is connected to an opening and closing drill plate 7. Two adjacent opening and closing drill plates 7 are in contact with each other to form a complete opening and closing drill bit. A winch 8 is installed in the middle of the right side of the pressure traction guide rail 2. A steel wire rope 9 is wound on the winch 8. A precast concrete pile 10 is connected to the steel wire rope 9. The precast concrete pile 10 is located inside the steel casing drill rod 4. The opening and closing drill plate 7 drills a hole in the ground. The grouting mechanism is used to spray mortar into the hole to form a cement-soil external pile. The guiding mechanism is used to guide the steel wire rope 9.

[0027] like Figures 5-7 As shown, the shotcrete mechanism includes a hollow rotary shotcrete head 121, a connector 124, and a female drive sleeve 125. The hollow rotary shotcrete head 121 is installed at the bottom of the power head 3. The steel casing drill rod 4 has vertical grooves 122 evenly spaced around its circumference. Each of the two adjacent opening and closing drill plates 7 has a shotcrete nozzle 123 on the side closest to each other. The vertical grooves 122 and the shotcrete nozzles 123 correspond to each other. The steel casing drill rod 4 is connected to the connector 124 evenly spaced around its circumference. The connector 124 communicates with the vertical grooves 122. The female drive sleeve 125 is installed at the bottom of the hollow rotary shotcrete head 121. The upper end of the steel casing drill rod 4 has a male drive key. The steel casing drill rod 4 cooperates with the female drive sleeve 125 through the male drive key. The lower end of the steel casing drill rod 4 has a female drive key. The steel casing drill rods 4 can be spliced ​​together by the male drive key and the female drive key.

[0028] like Figure 8 As shown, the guiding mechanism includes a stepper motor 131, a gearbox 132, a rotating shaft 133, a rotating plate 134, a guide wheel 135, and a bushing 136. The stepper motor 131 is bolted to the top of the pressure traction guide rail 2. The output shaft of the stepper motor 131 is connected to the input end of the gearbox 132. The rotating shaft 133 is rotatably connected to the left side of the gearbox 132. The lower end of the rotating shaft 133 is rotatably connected to the top of the pressure traction guide rail 2. The rotating plate 134 is connected to the upper end of the rotating shaft 133. Guide wheels 135 are rotatably connected to both sides of the rotating plate 134. The wire rope 9 passes around the guide wheel 135. The bushing 136 is bolted to the top left side of the gearbox 132. The rotating shaft 133 is located inside the bushing 136, and the rotating shaft 133 and the bushing 136 are rotatably connected.

[0029] Workers hoisted the steel casing drill rod 4 from bottom to top, inserted the male drive key at the upper end of the drill rod 4 into the female drive sleeve 125 from bottom to top, connected the hollow rotary shotcrete nozzle 121 and connector 124, then connected the hollow rotary shotcrete nozzle 121 to the shotcrete equipment, and then moved the entire equipment to the construction site by a tracked vehicle 1. The opening and closing drill plate 7 was then adjusted to the closed state, and the workers started the stepper motor 131. The output shaft of the stepper motor 131 drove the rotating shaft 133 to rotate through the reduction gearbox 132. The rotating shaft 133 drove the rotating plate 134 to rotate, and the rotating plate 134 drove the wire rope 9 to rotate, moving the wire rope 9 away from directly above the steel casing drill rod 4, making it easier to fix the precast concrete pile 10 onto the wire rope 9. After the precast concrete pile 10 is fixed, the output shaft of the stepper motor 131 drives the rotating shaft 133 to reverse through the reduction gearbox 132. The rotating shaft 133 drives the wire rope 9 to reverse, and the wire rope 9 drives the precast concrete pile 10 to rotate, rotating the precast concrete pile 10 directly above the steel casing drill rod 4. The reduction gearbox 132 can reduce the rotation speed of the precast concrete pile 10 to prevent it from swaying violently due to excessive speed. Then, the operator controls the winch 8 to release the wire rope 9. Under its own weight, the precast concrete pile 10 moves downward into the steel casing drill rod 4 and contacts the opening and closing drill plate 7. The hydraulic clamp 5 clamps the precast concrete pile 10, and then the wire rope 9 and the precast concrete pile 10 are separated. Subsequently, the operator... The power head 3 is controlled to rotate forward, which drives the steel casing drill rod 4 to rotate forward. The steel casing drill rod 4 drives the opening and closing drill plate 7 to rotate forward. The precast concrete pile 10 will rotate together with the steel casing drill rod 4 and the opening and closing drill plate 7. At the same time, the operator controls the pressure traction guide rail 2 to move the power head 3 downward. The power head 3 drives the opening and closing drill plate 7 to move downward with pressure, allowing the opening and closing drill plate 7 to drill a hole in the ground. The pressure traction guide rail 2 continuously applies pressure to ensure that the opening and closing drill plate 7 can smoothly enter the soil. At this time, the precast concrete pile 10 moves downward together with the steel casing drill rod 4, so that the steel casing drill rod 4 and the precast concrete pile 10 reach the set depth synchronously, avoiding hole shrinkage and hole collapse, and ensuring that the mortar can form an effective hole wall, thereby preventing the precast concrete pile 10 from not being able to reach the set depth. The process is centered and eccentric, and a single device can complete the pile planting process, improving construction efficiency and reducing costs. Then, workers control the shotcrete equipment to inject mortar into the hollow rotary shotcrete nozzle 121. The mortar is sprayed out through the vertical groove 122 from the spray nozzle 123 into the hole, forming a cement-soil external pile. When the steel casing drill rod 4 and the precast concrete pile 10 reach the set depth, the hydraulic jack 5 releases the precast concrete pile 10. Under its own weight, the precast concrete pile 10 moves downwards, pushing the opening and closing drill plate 7. The opening and closing drill plate 7 rotates and opens in a direction away from each other. Then, the pressure traction guide rail 2 is controlled to move the steel casing drill rod 4 and the opening and closing drill plate 7 upwards, raising them by 20 centimeters.The precast concrete pile 10 remains inside the hole. The hydraulic jack 5 clamps the precast concrete pile 10 again. Then, the pressure traction guide rail 2 is controlled to move the power head 3 downward. The power head 3 can press down on the precast concrete pile 10, ensuring that the lower end of the precast concrete pile 10 can squeeze the loose mud under the opening and closing drill plate 7. Then, the hydraulic jack 5 releases the precast concrete pile 10. Then, the pressure traction guide rail 2 is controlled to move the steel casing drill rod 4 and the opening and closing drill plate 7 slowly upward, pushing out the steel casing drill rod 4 and rotating and mixing the soil and mortar. Then, the power head 3 is controlled to reverse, driving the steel casing drill rod 4 and the opening and closing drill plate 7 to reverse. During this process, grouting continues to be carried out to ensure that the soil and mortar are fully mixed. When the steel casing drill rod 4 and the opening and closing drill plate 7 are removed from the hole, the pressure traction guide rail 2 stops running, the steel casing drill rod 4 and the opening and closing drill plate 7 stop rotating, the grouting equipment stops grouting, and the construction is completed.

[0030] like Figure 9 and Figure 10 As shown, it also includes a bottom-expanding mechanism, which includes a bottom-expanding drill bit 141 and a limiting block 142. The bottom-expanding drill bit 141 is hinged at even intervals around the lower part of the steel casing drill rod 4. The bottom-expanding drill bit 141 has a plow-shaped structure on both the upper and lower sides, which can better expand the bottom. The limiting block 142 is connected at even intervals around the lower part of the steel casing drill rod 4.

[0031] When the steel casing drill rod 4 rotates forward, the underreaming drill bit 141 will not open. When the steel casing drill rod 4 rotates in reverse, the underreaming drill bit 141 will open automatically. The limiting block 142 can limit the underreaming drill bit 141 to prevent it from opening too much. The underreaming drill bit 141 can perform underreaming operations, so that the mortar and soil are fully mixed and fully integrated with the precast concrete pile 10, thereby increasing the pile diameter and increasing the pile body friction resistance. During this process, grouting is continuously carried out to ensure that the soil and mortar can be fully mixed. After the underreaming requirements are met, the steel casing drill rod 4 continues to rotate forward, and the underreaming drill bit 141 will automatically close.

[0032] like Figure 1 As shown, it also includes a stirring blade 15. The stirring blade 15 is connected to the lower part of the steel casing drill rod 4. The stirring blade 15 is located above the underreaming drill bit 141. When the steel casing drill rod 4 rotates, it will drive the stirring blade 15 to rotate. The stirring blade 15 can fully mix the mortar and soil, fill the pores, improve the density of the mortar, and improve the bearing capacity of the mortar. During this process, grouting is continuously carried out to ensure that the soil and mortar can be fully mixed.

[0033] like Figure 1 As shown, it also includes a conical plate 16. The top of the power head 3 is connected to the conical plate 16. The conical plate 16 can guide the precast concrete pile 10 so that the precast concrete pile 10 can better enter the steel casing drill rod 4.

[0034] This invention also provides a construction process for rigid composite piles using a casing drill rod for synchronous pile driving, comprising the following steps: S1: The staff lifts the steel casing drill rod 4 from bottom to top by hoisting, inserts the male drive key at the upper end of the steel casing drill rod 4 into the female drive sleeve 125 from bottom to top, then connects the hollow rotary shotcrete 121 and the connector 124, and then connects the hollow rotary shotcrete 121 to the shotcrete equipment. S2: Move the entire equipment to the construction site using the tracked vehicle 1, and then control the output shaft of the servo motor 5 to rotate, adjusting the opening and closing drill plate 7 to the closed state; S3: Start the stepper motor 131 to drive the wire rope 9 to rotate, move the wire rope 9 away from directly above the steel casing drill rod 4, then fix the precast concrete pile 10 on the wire rope 9, start the stepper motor 131 again to drive the wire rope 9 to reverse, rotate the precast concrete pile 10 to directly above the steel casing drill rod 4, control the winch 8 to release the wire rope 9, and the precast concrete pile 10 moves downward into the steel casing drill rod 4 under its own weight and contacts the opening and closing drill plate 7. The precast concrete pile 10 is clamped by the hydraulic top clamp 5, and then the wire rope 9 and the precast concrete pile 10 are separated. S4: Control the power head 3 to rotate forward, driving the steel casing drill rod 4 and the opening and closing drill plate 7 to rotate forward. At the same time, control the pressure traction guide rail 2 to drive the opening and closing drill plate 7 to move downward under pressure, and the opening and closing drill plate 7 drills a hole on the ground. S5: Control the shotcrete equipment to inject mortar into the hollow rotary shotcrete gun 121. The mortar is sprayed out from the spray nozzle 123 through the vertical groove 122 and sprayed into the hole to form a cement-soil external pile. At this time, the stirring blade 15 fully mixes the mortar and soil. The precast concrete pile 10 moves downward together with the steel casing drill rod 4, so that the steel casing drill rod 4 and the precast concrete pile 10 reach the set depth synchronously. S6: When the steel casing drill rod 4 and the precast concrete pile 10 reach the set depth, the hydraulic jack 5 releases the precast concrete pile 10, and the precast concrete pile 10 pushes the opening and closing drill plate 7. The opening and closing drill plate 7 rotates and opens in the direction away from each other, lifting the steel casing drill rod 4 and the opening and closing drill plate 7 upward by 20 cm. The precast concrete pile 10 stays in the hole, and the hydraulic jack 5 clamps the precast concrete pile 10 again. Then the power head 3 presses down on the precast concrete pile 10, and then the hydraulic jack 5 releases the precast concrete pile 10. S7: Control the output shaft of the drive motor 112 to reverse, causing the steel casing drill rod 4 and the opening and closing drill plate 7 to reverse, and the bottom expansion drill bit 141 will automatically open to carry out bottom expansion operation. During this process, grouting is continuously carried out. At the same time, control the pressure traction guide rail 2 to drive the steel casing drill rod 4 and the opening and closing drill plate 7 to move slowly upward, push out the steel casing drill rod 4, and rotate and mix the soil and mortar. S8: After the bottom expansion requirement is met, the steel casing drill rod 4 continues to rotate forward, the bottom expansion drill bit 141 will automatically close, the steel casing drill rod 4 and the opening and closing drill plate 7 continue to move slowly upward, pushing the steel casing drill rod 4 out and rotating and mixing the soil and mortar. During this process, grouting continues. When the steel casing drill rod 4 and the opening and closing drill plate 7 are removed from the hole, the pressure traction guide rail 2 stops running, the steel casing drill rod 4 and the opening and closing drill plate 7 stop rotating, the grouting equipment stops grouting, and the construction is completed.

[0035] The above description is merely an embodiment of the present invention and is not intended to limit the present invention. All equivalent substitutions made within the principles of the present invention should be included within the scope of protection of the present invention. Contents not described in detail in this invention are existing technologies known to those skilled in the art.

Claims

1. A rigid composite pile construction machine for synchronous pile driving with casing drill rod, comprising a tracked vehicle (1), a pressure traction guide rail (2), and a power head (3), wherein the tracked vehicle (1) is equipped with the pressure traction guide rail (2), and the power head (3) is installed on the slider of the pressure traction guide rail (2), characterized in that: It also includes a steel casing drill rod (4), a hydraulic jack (5), an opening and closing shaft (6), an opening and closing drill plate (7), a winch (8), a wire rope (9), a precast concrete pile (10), a shotcrete mechanism, and a guiding mechanism. The power head (3) is equipped with hydraulic jacks (5) at even intervals around its outer circumference. The steel casing drill rod (4) is equipped with opening and closing shafts (6) at even intervals around its lower circumference. Each opening and closing shaft (6) is connected to an opening and closing drill plate (7). Two adjacent opening and closing drill plates (7) 7) They come into contact with each other to form a complete opening and closing drill bit. A winch (8) is installed on the pressure traction guide rail (2). A wire rope (9) is wound on the winch (8). A precast concrete pile (10) is connected to the wire rope (9). The precast concrete pile (10) is located inside the steel casing drill rod (4). The opening and closing drill plate (7) drills holes on the ground. The grouting mechanism is used to spray mortar into the hole to form a cement-soil external pile. The guiding mechanism is used to guide the wire rope (9).

2. The rigid composite pile construction machine for synchronous pile driving with casing drill rod according to claim 1, characterized in that: The shotcrete mechanism includes a hollow rotary shotcrete nozzle (121), a connector (124), and a female drive sleeve (125). The hollow rotary shotcrete nozzle (121) is installed at the bottom of the power head (3). A vertical groove (122) is opened on the steel casing drill rod (4). Shotcrete nozzles (123) are opened on the opening and closing drill plate (7). The vertical groove (122) and the shotcrete nozzle (123) correspond to each other. A connector (124) is connected to the steel casing drill rod (4). The connector (124) and the vertical groove (122) are connected. A female drive sleeve (125) is installed at the bottom of the hollow rotary shotcrete nozzle (121).

3. The rigid composite pile construction machine for synchronous pile driving with casing drill rod according to claim 2, characterized in that: The guiding mechanism includes a stepper motor (131), a gearbox (132), a rotating shaft (133), a rotating plate (134), a guide wheel (135), and a bushing (136). The stepper motor (131) is mounted on the top of the pressure-pull guide rail (2). The output shaft of the stepper motor (131) is connected to the input end of the gearbox (132). The rotating shaft (133) is rotatably connected to the gearbox (132). The lower end of the rotating shaft (133) is connected to the top of the pressure-pull guide rail (2). The rotating shaft (133) is connected to a rotating plate (134) at its upper end. The rotating plate (134) is rotatably connected to guide wheels (135) on both the left and right sides for guiding the wire rope (9). The wire rope (9) passes around the guide wheels (135). The top of the gearbox (132) is connected to a bushing (136) for supporting the rotating shaft (133). The rotating shaft (133) is located inside the bushing (136), and the rotating shaft (133) and the bushing (136) are rotatably connected.

4. The rigid composite pile construction machine for synchronous pile driving with casing drill rod according to claim 3, characterized in that: It also includes a bottom expansion mechanism, which includes a bottom expansion drill bit (141) and a limiting block (142). The bottom expansion drill bit (141) is hinged at a uniform interval in the lower circumference of the steel casing drill rod (4), and the limiting block (142) is connected at a uniform interval in the lower circumference of the steel casing drill rod (4) to limit the bottom expansion drill bit (141).

5. A rigid composite pile construction machine for synchronous pile driving with casing drill rod according to claim 4, characterized in that: It also includes a stirring cutter (15), which is connected to the lower part of the steel casing drill rod (4). The stirring cutter (15) is located above the underreaming drill bit (141).

6. The rigid composite pile construction machine for synchronous pile driving with casing drill rod according to claim 1, characterized in that: It also includes a conical plate (16), and the top of the power head (3) is connected to the conical plate (16).

7. The construction process for a rigid composite pile using a casing drill rod for synchronous pile driving according to claim 5, characterized in that, Includes the following steps: S1: The staff hoisted the steel casing drill rod (4) from bottom to top, inserted the male drive key at the top of the steel casing drill rod (4) into the female drive sleeve (125) from bottom to top, then connected the hollow rotary shotcrete gun (121) and the connector (124), and then connected the hollow rotary shotcrete gun (121) to the shotcrete equipment. S2: Move the entire equipment to the construction site by tracked vehicle (1), and then control the output shaft of servo motor (5) to rotate and adjust the opening and closing drill plate (7) to the closed state; S3: Start the stepper motor (131) to drive the wire rope (9) to rotate, move the wire rope (9) away from the top of the steel casing drill rod (4), then fix the precast concrete pile (10) on the wire rope (9), start the stepper motor (131) again to drive the wire rope (9) to reverse, rotate the precast concrete pile (10) to the top of the steel casing drill rod (4), control the winch (8) to release the wire rope (9), and the precast concrete pile (10) moves down into the steel casing drill rod (4) under its own weight and contacts the opening and closing drill plate (7). The precast concrete pile (10) is clamped by the hydraulic top clamp (5), and then the wire rope (9) and the precast concrete pile (10) are separated. S4: Control the power head (3) to rotate forward, drive the steel casing drill rod (4) and the opening and closing drill plate (7) to rotate forward, and at the same time, control the pressure traction guide rail (2) to drive the opening and closing drill plate (7) to move downward with pressure, and the opening and closing drill plate (7) drills a hole on the ground; S5: Control the shotcrete equipment to inject mortar into the hollow rotary shotcrete gun (121). The mortar is sprayed out from the spray nozzle (123) through the vertical groove (122) and sprayed into the hole to form a cement-soil external pile. At this time, the stirring blade (15) fully mixes the mortar and soil. The precast concrete pile (10) moves downward together with the steel casing drill rod (4) so ​​that the steel casing drill rod (4) and the precast concrete pile (10) reach the set depth synchronously. S6: When the steel casing drill rod (4) and the precast concrete pile (10) reach the set depth, the hydraulic jack (5) releases the precast concrete pile (10), and the precast concrete pile (10) pushes the opening and closing drill plate (7). The opening and closing drill plate (7) rotates and opens in the direction away from each other, raising the steel casing drill rod (4) and the opening and closing drill plate (7) 20 cm upward. The precast concrete pile (10) stays in the hole, and the hydraulic jack (5) clamps the precast concrete pile (10) again. Then the power head (3) presses down on the precast concrete pile (10), and then the hydraulic jack (5) releases the precast concrete pile (10). S7: Control the output shaft of the drive motor (112) to reverse, causing the steel casing drill rod (4) and the opening and closing drill plate (7) to reverse, and the bottom expansion drill bit (141) will automatically open to carry out bottom expansion operation. During this process, grouting is continuously carried out. At the same time, control the pressure traction guide rail (2) to drive the steel casing drill rod (4) and the opening and closing drill plate (7) to move slowly upward, push out the steel casing drill rod (4), and rotate and mix the soil and mortar. S8: After the bottom expansion requirement is met, the steel casing drill rod (4) continues to rotate forward, the bottom expansion drill bit (141) will automatically close, the steel casing drill rod (4) and the opening and closing drill plate (7) continue to move slowly upward, push out the steel casing drill rod (4), and rotate and mix the soil and mortar. During this process, grouting continues. When the steel casing drill rod (4) and the opening and closing drill plate (7) are removed from the hole, the pressure traction guide rail (2) stops running, the steel casing drill rod (4) and the opening and closing drill plate (7) stop rotating, the grouting equipment stops grouting, and the construction is completed.

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