Self-drilling composite inclined pile support construction device

Abstract

The invention relates to a self-drilling composite inclined pile support construction device which is mainly composed of a machine frame, a rotating device, an inclined pile steel pipe, a stirring head, a torsion grouting connector and a grouting device, the machine frame is a device which provides counter force and has the function of controlling the buried position and direction of an inclined pile, and the rotating device has the function of driving the inclined pile steel pipe to rotate. The inclined pile steel pipe is a steel pipe obliquely inserted into a soil body, the stirring head is a component with the function of stirring and crushing the soil body, the grouting device is a device with the function of injecting fluid into the soil body, and the torsion grouting connector comprises an inner cylinder, an end plate, an outer sleeve, a positioning ring, a sealing piece, a sealing fastener and an outer sleeve fixing component. The torsion grouting connector has the function of injecting fluid in the grouting pipe into the batter pile steel pipe in the rotating process of the batter pile steel pipe. The construction efficiency of the composite batter pile support is greatly improved, the capacity of avoiding and crossing underground obstacles is high, the construction quality is reliable, and the construction cost of the batter pile support is greatly reduced.

Description

Technical Field

[0001] The invention relates to a self-drilling composite inclined pile support construction device in the field of foundation pit support engineering. Background Art

[0002] In foundation pit support engineering, composite inclined pile supports with mixing piles are constructed by placing rigid piles (including precast reinforced concrete piles and steel piles) within cement-soil mixing piles that are tilted inward toward the foundation pit, forming composite inclined piles as the foundation pit support structure. Mixing piles are formed by mixing and crushing soil and then injecting cement slurry to form the composite material. The inventors proposed a technical solution in December 2010 that solved the problem of cross-sectional alignment between the inclined piles and the cement-soil reinforcement in the mixing inclined pile support (Patent No.: ZL2010105853341). The main difference between a mixing pile with an inclined support and a composite anchor with a cement-soil mixing pile is that the rods in the composite anchor are tensile components, with no slenderness requirements, whereas the composite inclined support is a compressive component, with some restrictions on the rod slenderness ratio. Therefore, the inclined pile members in the composite inclined support have larger cross-sectional dimensions, making diagonal construction difficult. By combining cement-soil piles with precast piles, the difficulty of inserting the inclined piles is significantly reduced, while the axial bearing capacity of the inclined piles after the cement-soil solidifies is significantly increased. In April 2015, the inventors designed a structural form for an inclined pile support excavation (patent application number: 2015202003466). In June 2016, the inventors designed a composite inclined pile support excavation support structure (patent application number: 2016206755781). Initially, the construction equipment for composite inclined pile supports primarily involved constructing a cement-soil reinforcement in the soil and installing guide rods within the reinforcement. Prefabricated piles were then inserted into the reinforcement using static pressure or vibration, sleeved onto the guide rods. This type of equipment was slow and required a high level of labor. For a 30-meter-long inclined pile support, each set of equipment could only construct two to three piles per day. This equipment was used in multiple projects. Later, the inventors improved the composite inclined pile support construction equipment by using a long-arm excavator as the pile frame, combined with a hydraulically driven drill rig to provide construction power. A mixing drill rod was installed inside the composite inclined pile support steel pipe, and a disposable mixing head and grouting pipe were installed outside the pipe. This enabled the composite inclined pile support to be formed in one go, saving construction labor and being tested in multiple projects. However, this construction device (Patent No. 2022228701731) still did not meet project requirements, and the connection and removal of the mixing drill rod segmented joints inside the steel pipe took a long time. Engineering construction requires further research and development of faster and more efficient composite inclined pile support construction devices. Summary of the Invention

[0003] The purpose of the present invention is to provide a self-drilling composite inclined pile support construction device, which is easy to install, has a fast construction speed, good construction quality and low construction cost.

[0004] The self-drilling composite inclined pile support construction device includes nine parts: a frame, a rotating device, an inclined pile steel pipe, a tapered pile tip, a slurry outlet, a mixing head, a grouting pipe, a grouting device, and a torsion grouting connector. The frame is a device that provides reaction force and has the function of controlling the position and direction of the inclined pile entering the soil. The rotating device is a device that has the function of driving the inclined pile steel pipe to rotate. The inclined pile steel pipe is a steel pipe that is inserted obliquely into the soil and can serve as an inclined pile support. The tapered pile tip is a component that reduces the resistance of the inclined pile steel pipe to entering the soil and increases the ability of the inclined pile steel pipe to avoid underground obstacles. The slurry outlet is a channel opening located at the bottom of the inclined pile steel pipe for injecting cement slurry into the soil. The mixing head is a component that has the function of stirring and crushing the soil. The grouting pipe is a hollow tubular component. The grouting device has the function of injecting fluid into the soil. The torsion grouting connector is an instrument that has the function of injecting the fluid in the grouting pipe into the inclined pile steel pipe during the rotation of the inclined pile steel pipe. The torsion grouting connector includes an inner tube, an end plate, an outer sleeve, a positioning ring, a seal, a sealing The cam is connected to the outer sleeve by a screw thread, and the cam is connected to the outer sleeve by a screw thread, and the cam is connected to the inner sleeve by a screw thread, and the cam is connected to the outer sleeve by a screw thread, and the cam is connected to the outer sleeve by a screw thread.

[0005] In the above-mentioned self-drilling composite inclined pile support construction device, the above-mentioned mixing head includes a mixing head support shaft and at least two mixing plates. The mixing plates have the function of rotating around the mixing head support shaft. The mixing head support shaft is fixed on the inclined pile steel pipe.

[0006] In the above-mentioned self-drilling composite inclined pile support construction device, a spring for balancing the gravity of the stirring plate is provided between the above-mentioned stirring plate and the inclined pile steel pipe.

[0007] The self-drilling composite inclined pile support construction device uses the inclined pile steel pipe to be constructed as a part of the construction device, and injects cement slurry into the soil around the inclined pile steel pipe through rotation and stirs it to form a cement-soil mixing pile. The drilling movement of the tapered pile tip can avoid the engineering piles constructed in the soil first, and the tapered pile tip can also be used as a drill bit, so that the resistance of the reinforced mixing pile passing through the pit bottom is greatly reduced. The construction device can also be used to complete the inclined mixing pile construction, and then the PHC pipe pile is sleeved on the outside of the inclined pile steel pipe and inserted into the soil by a guided construction method, and the inclined pile steel pipe and the mixing head are recovered for reuse. The construction speed is fast, the construction quality is reliable, and the project cost is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 A schematic diagram of the structure of the self-drilling composite inclined pile support construction device used in the first embodiment of the present invention;

[0009] Figure 2 A schematic diagram of the structure of a torsion grouting connector used in the first embodiment of the present invention;

[0010] Figure 3 A schematic diagram of a multi-row hole flange structure used in the first embodiment of the present invention;

[0011] Figure 4 A schematic diagram of a flange structure used in the first embodiment of the present invention;

[0012] Figure 5 A schematic diagram of the cross-sectional structure of a positioning ring used in the first embodiment of the present invention;

[0013] Figure 6 A schematic cross-sectional view of a stowable stirring head in working state used in a second embodiment of the present invention;

[0014] Figure 7 A schematic cross-sectional view of a retractable stirring head in a retracted state used in a second embodiment of the present invention;

[0015] Figure 8 A schematic diagram of the cross-sectional structure of a retractable stirring head used in the second embodiment of the present invention. DETAILED DESCRIPTION

[0016] Explanation of the reference numerals: 1-frame; 2-rotating device; 3-inclined pile steel pipe; 4-tapered pile tip; 5-slurry outlet hole; 6-mixing head; 7-grouting pipe; 8-grouting device; 9-mixing plate; 10-torsion grouting connector; 11-outer sleeve fixing member; 12-outer sleeve; 13-inner sleeve; 14-flange; 15-positioning ring; 16-seal; 17-slurry inlet hole; 18-sealing fastener; 19-power device connector; 20-end plate; 21-slurry flow direction; 22-bolt; 23-bolt hole; 24-spring; 25-mixing head support shaft; 26-mixing head support plate.

[0017] As the first embodiment of the present invention, Figures 1 to 5, the working principle, structural structure and use method of a self-drilling composite inclined pile support construction device of the present invention are introduced. First of all, the working principle of the present invention is introduced. In the construction practice of inclined pile supports for foundation pit enclosure, the angle between the inclined pile support and the vertical plane is generally close to 45 degrees, and the construction site outside the foundation pit is very narrow. The inclined pile support of inclined construction makes its construction process more complicated than vertical or near horizontal angle construction. On the one hand, the inclination of the inclined pile must be maintained during the construction process. On the other hand, the top of the inclined pile is high and far away from the construction operation surface. In addition, the length of the inclined pile support is long, generally 20 to 40 meters long, and it needs to be constructed in sections, which further increases the difficulty of construction. For self-drilling composite inclined pile supports, the stiffness of the drill rod, the number of drill rod joints, and the construction time of the segmented drill rod connection have a huge impact on the effectiveness. The present invention utilizes a maneuverable and flexible excavator and an extended arm excavator to realize the construction of inclined pile supports on the inner side of the foundation pit, solving the problem of narrow operating surface in the construction of composite inclined pile supports. Combined with the characteristics of larger diameter of inclined pile steel pipes and longer excavator arms, the problem of too many sections of inclined construction mixing drill rods is solved. By utilizing the advantages of mature technology of the power device connected to the excavator and combining the torsional grouting connector proposed in the present invention, the larger diameter inclined pile steel pipe itself is used as the drill rod for rapid construction of inclined mixing piles, and the constructed mixing piles and inclined pile supports are strictly aligned along their entire length, which can greatly improve construction efficiency and ensure construction quality. The self-drilling composite inclined pile support construction device of the present invention comprises nine parts: a frame, a rotating device, an inclined pile steel pipe, a tapered pile tip, a grouting hole, a mixing head, a grouting pipe, a grouting device, and a torsion grouting connector. The frame provides a reaction force and controls the position and direction of the inclined pile in the ground. An excavator or an extended-arm excavator can be used as the frame. Excavators offer excellent maneuverability, facilitating pile placement, tilt adjustment, and pile connection during inclined pile construction, resulting in faster construction speeds. An extended-arm excavator can be used as the frame, as the extended arm can increase the construction length of a single-section pile and improve construction efficiency. When an excavator is used as the frame, the excavator's bucket can be removed, and the rotating device can be driven by the oil pump that drives the excavator's bucket. The rotating device is a device that drives the inclined pile steel pipe. In this embodiment, an auger can be used as the rotating device. The auger can be connected to the power oil pipe used to drive the excavator's bucket, and the excavator's hydraulic drive system can be used to drive the auger to provide rotational power. In this embodiment, an electric motor can also be used as the rotating device. The inclined pile steel pipe is a steel pipe that is inserted obliquely into the soil and serves as a support for the inclined pile. In this embodiment, the inclined pile steel pipe should have a certain strength, rigidity, and slenderness ratio. A steel pipe with a diameter of 150-500mm and a wall thickness of 5-30mm can be used as the inclined pile steel pipe. The inclined pile steel pipe should have the torsional bearing capacity required for mixing the soil. In this embodiment, the inclined pile steel pipe can also be a segmented casing connected to the inclined pile. The tapered pile tip is a component that reduces the resistance of the inclined pile steel pipe to the soil and increases its ability to avoid underground obstacles. In this embodiment, the steel pile tip commonly used in precast piles can be welded to the bottom of the inclined pile steel pipe to serve as the tapered pile tip.The slurry outlet is a passageway located at the bottom of the inclined pile steel pipe for injecting cement slurry into the soil. The slurry outlet can be a hole opened on the side wall of the inclined pile steel pipe as a slurry outlet. In this case, the inclined pile steel pipe itself also serves as a grouting pipe for the part entering the soil. Alternatively, a grouting pipe can be connected to the inclined pile steel pipe, and the mouth of the grouting pipe can be connected to the soil, and the mouth of the grouting pipe can be used as the slurry outlet. The mixing head is a component that has the function of stirring and crushing the soil. In this embodiment, the mixing head used in the construction of mixing piles, such as steel bars or spiral plates, can be used as the mixing head. The size of the slurry outlet can also be made to be similar to the size of the high-pressure rotary jet pile nozzle. A high-pressure rotary jet pump can be used as a grouting device. The high-pressure jet slurry is used to cut the soil and grout, completing the grouting and stirring functions of the soil. The grouting pipe is a hollow tubular component. The grouting device is a device that has the function of injecting fluid into the soil. In this embodiment, the grouting pump and grouting pipe used in cement-soil mixing piles can be used, and the grouting pipe and grouting pump used in the construction of high-pressure rotary jet piles can also be used. A torsional grouting connector is a device that injects fluid from a grouting pipe into the inclined pile steel pipe during its rotation. In this embodiment, the torsional grouting connector comprises seven components: an inner tube, an end plate, an outer sleeve, a retaining ring, a seal, a sealing fastener, and an outer sleeve fixing member. The inner tube is a hollow, annular steel pipe with a torque-transmitting function. The end plate is a plate-shaped member that seals the inner tube's end. The outer sleeve is a hollow, annular steel pipe with an inner diameter larger than its outer diameter. The retaining ring is a member located between the inner and outer tubes and controls the relative position of the seal along the inner tube axis. The seal seals the gap between the inner and outer tubes. In this embodiment, its primary function is to prevent grout from leaking through the gap between the inner and outer tubes when the inner tube rotates relative to the outer tube. In this embodiment, V-shaped or VA-shaped seals can be used, or packing can be used to fill the gap between the inner and outer tubes. In this embodiment, the sealing fastener is a component that has the function of pressing the sealing member so that the sealing member is in close contact with the inner sleeve and the outer sleeve, and can be used, for example. Figure 2In the illustrated embodiment, a flange placed outside the inner tube serves as a sealing fastener. By tightening the bolts, the sealing fastener compresses the retaining ring, which in turn compresses the seal, compressing the seal's height along the inner tube's axis and causing it to expand radially along the inner tube. This allows the seal to maintain close contact with the outer surface of the inner tube and the inner surface of the outer tube, achieving a seal. The outer tube fixing member secures the outer tube relative to the rotating device. In this embodiment, the outer tube fixing member primarily balances the force transmitted to the outer tube by the inner tube's rotational motion during the inner tube's rotation, maintaining the outer tube in a stationary state. It can be fabricated from a steel member connected to the frame or power unit. In this embodiment, slurry inlets are provided on the inner tube, outer tube, and inclined pile steel pipe, ensuring that cement slurry can only flow in and out through the inlet holes during the inclined pile steel pipe's rotation. The frame is connected to the rotating device, and the rotating shaft of the rotating device is connected to the inner tube via a power unit connector. The power unit connector can be provided by the rotating device manufacturer. The power unit connector must be capable of transmitting torque from the rotating shaft and be easy to install and remove. The inner tube is connected to the inclined pile steel pipe, the grouting device is connected to the outer tube through the grouting pipe, the inner tube is connected to the outer tube through the opening, the inner tube is connected to the inclined pile steel pipe, the mixing head and the tapered pile tip are connected to the bottom of the inclined pile steel pipe, and the slurry outlet is located at the bottom of the inclined pile steel pipe. The following part of this embodiment mainly introduces the use method of the self-drilling composite inclined pile support construction device of the present invention. This embodiment is introduced by taking a 2-section pile as an example. The construction pile length is set to 30m. The length of the first section pile can be set to 17m, and the length of the second section pile can be set to 13m. The inclined pile steel pipe adopts an outer diameter of 325mm steel pipe, and the inclined pile steel pipe segment joint casing adopts an outer diameter of 351mm steel pipe pile. A 600 excavator with an extended mechanical arm is used as the frame. Before construction, the oil pipe connected to the bucket is connected to the rotating device, and the rotating device is driven to rotate by the excavator oil pump, and the rotating device is connected to the torsion grouting connector. The grouting device is connected to the torsion grouting connector with a grouting pipe. Weld the 1-2m long joint sleeve to the flange and seal the upper end of the joint sleeve with an end plate. Figure 2 Then connect the joint sleeve to the torsion grouting machine, as shown. Figure 1 In this embodiment, the inner tube of the torsion grouting connector and the inclined pile steel pipe can be directly connected, or the inner tube of the torsion grouting connector can be directly connected to the inclined pile steel pipe. Figure 1 and Figure 2 In this embodiment, in order to meet the construction requirements of inclined pile steel pipes with different outer diameters, the grouting pipes shown in FIG. Figure 2 The flange at the bottom of the torsion grouting connector shown in FIG. 1 is provided with multiple rows of bolt holes, such as Figure 3 After the construction equipment is installed, the grouting direction can be maintained during the rotation of the inclined pile steel pipe. Figure 2As shown. Complete the construction preparation and start the construction. The first step is to fully weld the first section of the pile to the joint sleeve. After completing the first step, proceed to the second step. In this step, use an excavator to lift the first section of the pile and place it at the pile position, and use the excavator to tilt forward to adjust the inclination of the inclined pile steel pipe so that the inclination of the inclined pile steel pipe meets the design requirements. After completing the second step, proceed to the third step. In this step, use an excavator to drive the rotating device to drive the inclined pile steel pipe to rotate, and use the excavator arm to apply oblique pressure to the inclined pile so that the inclined pile steel pipe enters the soil while rotating. At the same time, use a grouting pump to inject grout into the soil through the torsion grouting connector to construct a mixing pile reinforcement body. In this step, due to the design of the torsion grouting connector, the grouting pipe is connected to the outer sleeve of the torsion grouting connector, and the outer sleeve does not rotate, so continuous grouting can be achieved during the rotation of the inclined pile steel pipe until the first section of the inclined pile steel pipe is driven into the predetermined position. After completing the third step, proceed to the fourth step. In this step, the joint sleeve is cut 100 to 200 mm above the top of the first section of the inclined pile steel pipe, and the remaining joint sleeve left on the torsion grouting connector is fully welded to the second section of the pile. After completing the fourth step, proceed to the fifth step. In this step, first use an excavator to lift the second section of the inclined pile steel pipe to the top of the first section of the inclined pile steel pipe, and weld the second section of the inclined pile steel pipe to the first section of the inclined pile steel pipe. After completing the four steps, proceed to the fifth step. This step repeats the third step, driving the second section of the inclined pile steel pipe into the soil, and then cutting the joint sleeve, that is, using the self-drilling composite inclined pile support construction device of the present invention to complete the construction of the composite inclined pile support. According to the construction practice of the self-drilling composite inclined pile support construction device of the present invention, during the construction process of the inclined pile steel pipe, the tapered pile tip is set, and the tapered pile tip rotates continuously during the insertion into the soil. For the bored piles and PHC pipe piles with circular cross-sections that are currently commonly used, they can be smoothly avoided during the construction process. Furthermore, the tapered pile tip can be welded to a cross-plate, which doubles as a drill bit, allowing it to penetrate pre-installed concrete reinforcement at the bottom of the mixing pile pit. Dozens of completed 30-meter-long composite inclined pile supports have been constructed, with numerous engineering piles and cement-soil mixing pile reinforcements below the foundation pit bottom. None of the composite inclined pile supports required rework or pile removal due to obstructions caused by engineering piles or the pit reinforcement. This demonstrates the robust ability of the present invention's construction device to circumvent and penetrate obstacles.

[0018] As the second embodiment of the present invention, after the construction of the mixing pile is completed, according to the guided construction method proposed by the inventor (patent number: ZL2010105853341), hollow prefabricated PHC pipe piles are inserted along the outer periphery of the inclined pile steel pipe to form a composite inclined pile support. After the construction is completed, the inclined pile steel pipe is pulled out and reused. First, combined with Figures 6 to 8, introduces the structural structure, working principle and use method of a retractable mixing head of the present invention. In the first embodiment mentioned above, the inclined pile steel pipe can be directly used as an inclined pile support. This embodiment achieves the construction of mixing piles with a diameter larger than the outer diameter of the PHC pipe pile by providing a retractable mixing head. After the mixing pile construction is completed, the PHC pipe pile is sleeved on the outside of the inclined pile steel pipe and is driven obliquely into the unsolidified mixing pile constructed obliquely using a steel sheet pile driving machine to serve as an inclined pile support. During the driving process of the PHC pipe pile, the inclined pile steel pipe is provided in the hollow portion of the PHC pipe pile as a construction guide rod. By utilizing the guided construction method, the PHC pipe pile can be inserted into the soil strictly along the axis of the previously constructed mixing pile. On the one hand, this ensures the core quality control requirements of the mixing pile and the PHC pipe pile. On the other hand, because the tapered pile tip of the inclined pile steel pipe avoids the existing engineering piles during the construction of the mixing pile and passes through the pit bottom reinforcement mixing piles that may be encountered, the PHC pipe pile only needs to be inserted before the mixing pile of the composite inclined pile support solidifies. The PHC pipe pile can be inserted into the soil along the inclined pile steel pipe, avoiding the existing engineering piles and passing through the pit bottom reinforcement mixing piles, thus successfully completing the oblique PHC pipe pile driving construction. After the inclined PHC pile driving construction is completed, the inclined pile steel pipe can be pulled out from the hollow part of the PHC pile using a steel sheet pile pulling machine. When the inclined pile steel pipe is pulled out, the retractable mixing head is retracted under the resistance of the PHC pile side wall, and is pulled out from the hollow part of the PHC pile together with the inclined pile steel pipe and reused. In this embodiment, the retractable mixing head structure can be set as follows Figures 6 to 8 The structure shown. Figure 6 and Figure 8 As shown, the retractable mixing head can be set into a scissor shape. The retractable mixing head is composed of two mutually crossed mixing plates. A mixing head support shaft is set at the intersection of the two mixing plates, so that the two mutually crossed mixing plates can rotate around the mixing head support shaft respectively. The mixing head support shaft can be fixed on the side wall of the inclined pile steel pipe. The mixing head support shaft can also be fixed on the mixing head support plate, and the mixing head support plate is welded to the inclined pile steel pipe, such as Figures 6 to 8 In this embodiment, a spring can be set between the retractable mixing head and the inclined pile steel pipe. When the mixing pile of the composite inclined pile support is constructed, the spring tension is used to open the retractable mixing head, and the side wall of the inclined pile steel pipe can be used to prevent the mixing plate from turning upward, forming a Figure 6 When the inclined pile steel pipe is pulled out after the construction of the mixing pile is completed, the thrust of the PHC pile side wall is used to make the mixing head retractable into the shape shown in the figure. Figure 7The retracted state shown facilitates the removal of the retractable mixing head from the hollow portion of the PHC pile for reuse. In this embodiment, the tapered pile tip and mixing head can also be left within the inclined mixing pile. A square mortise and tenon structure, such as that designed by the inventors (Patent No. 2022228701731), is provided at the bottom of the inclined steel pipe to provide a torsion-resistant connection between the mixing head and tapered pile tip and the inclined pile steel pipe. This also allows the inclined pile steel pipe and mixing head to be separated under tension, enabling the recycling of the inclined pile steel pipe.

[0019] This patent includes but is not limited to other construction devices that can be used as an alternative by professionals in this field.

Claims

1. A self-drilling composite inclined pile support construction device, characterized in that It includes nine parts: a frame, a rotating device, an inclined pile steel pipe, a tapered pile tip, a slurry outlet hole, a mixing head, a grouting pipe, a grouting device, and a torsion grouting connector. The frame is a device that provides reaction force and has the function of controlling the position and direction of the inclined pile entering the soil. The rotating device is a device that has the function of driving the inclined pile steel pipe to rotate. The inclined pile steel pipe is a steel pipe that is inserted obliquely into the soil and can serve as an inclined pile support. The tapered pile tip is a component that reduces the resistance of the inclined pile steel pipe to entering the soil and increases the ability of the inclined pile steel pipe to avoid underground obstacles. The slurry outlet hole is a channel opening located at the bottom of the inclined pile steel pipe for injecting cement slurry into the soil. The mixing head is a component that has the function of stirring and crushing the soil. The grouting pipe is a hollow tubular component. The grouting device is a device that has the function of injecting fluid into the soil. The torsion grouting connector is an instrument that has the function of injecting the fluid in the grouting pipe into the inclined pile steel pipe during the rotation of the inclined pile steel pipe. The torsion grouting connector includes an inner tube, an end plate, an outer sleeve, a positioning ring, a seal, a sealing fastener, an outer sleeve The cylinder fixing component comprises seven parts, wherein the inner cylinder is a hollow circular cross-section steel pipe with the function of transmitting torque, the end plate is a plate-shaped component for sealing the end of the inner cylinder, the outer cylinder is a hollow circular cross-section steel pipe with an inner diameter larger than the outer diameter of the inner cylinder, the positioning ring is a component located between the inner cylinder and the outer cylinder and having the function of controlling the relative position of the seal between the inner cylinder and the outer cylinder along the axis direction of the inner cylinder, the seal is a component with the function of sealing the gap between the inner cylinder and the outer cylinder, the sealing fastener is a component with the function of making the seal in close contact with the inner cylinder and the outer cylinder by squeezing the seal, the outer cylinder fixing component is a component for fixing the relative position of the outer cylinder and the rotating device, the frame is connected to the rotating device, the rotating shaft of the rotating device is connected to the inner cylinder, the inner cylinder is connected to the inclined pile steel pipe, the grouting device is connected to the outer cylinder through the grouting pipe, the inner cylinder is connected to the outer cylinder through the opening, the inner cylinder is connected to the inclined pile steel pipe, the mixing head and the tapered pile tip are connected to the bottom of the inclined pile steel pipe, and the slurry outlet is located at the bottom of the inclined pile steel pipe.

2. The self-drilling composite inclined pile support construction device according to claim 1 is characterized in that The above-mentioned stirring head comprises a stirring head supporting shaft and at least two stirring plates. The stirring plates have the function of rotating around the stirring head supporting shaft. The stirring head supporting shaft is fixed on the inclined pile steel pipe.

3. The self-drilling composite inclined pile support construction device according to claim 2 is characterized in that A spring for balancing the gravity of the stirring plate is arranged between the stirring plate and the inclined pile steel pipe.

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