Self-drilling composite inclined pile support construction device

Abstract

The utility model 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 utility model relates to a kind of self-drilling composite inclined pile brace construction devices in foundation pit support engineering field. BACKGROUND

[0002] The composite inclined pile brace of mixing pile in foundation pit support engineering field is to set rigid pile (including prefabricated reinforced concrete pile, steel pile) in cement-soil mixing pile that is inclined to inside of foundation pit, and form composite inclined pile as foundation pit support structure. Mixing pile is to form composite material by injecting cement slurry after soil body is broken by mixing, and the technical solution proposed by the utility model designer in December 2010 solves the problem of inclined pile and cement-soil reinforced body cross section centering in mixing inclined pile brace (patent number: ZL2010105853341). The main difference between mixing pile inclined pile brace and cement-soil mixing pile composite anchor rod is that the rod in composite anchor rod is tensile member, and there is no requirement for the slenderness ratio of member, while composite inclined pile brace is compression member, and the slenderness ratio of rod is limited, so the cross section size of inclined pile member in composite inclined pile brace is larger, and there is certain difficulty in inclined construction. By using the characteristics that cement-soil is in flow state before solidification and the strength after solidification is higher than that of soil body, cement-soil pile and prefabricated pile are combined, on the one hand, the difficulty of inclined pile insertion construction is greatly reduced, and on the other hand, the axial bearing capacity of cement-soil after solidification is greatly improved. In April 2015, the utility model designer designed the structure form of inclined pile brace foundation pit support (patent application number: 2015202003466). In June 2016, the utility model designer designed the composite inclined pile brace foundation pit support structure (patent application number: 2016206755781). In the initial stage, the construction equipment of composite inclined pile brace mainly sets guide rod in cement-soil reinforced body by first constructing cement-soil reinforced body in soil body, and then inserts prefabricated pile on guide rod in cement-soil reinforced body by using static pressure or vibration method; the construction speed of this kind of construction equipment is slow, the amount of labor required during construction is large, and for 30m long inclined pile brace, each set of equipment can only construct 2-3 roots per day, which is applied in many projects in engineering; later, the utility model designer improved the construction equipment of composite inclined pile brace, used long-arm excavator as construction pile frame, combined with hydraulic-driven drilling machine to provide construction power, set mixing drill rod in the inner side of composite inclined pile brace steel pipe, set disposable mixing head and grouting pipe outside the composite inclined pile brace steel pipe, and formed mixing pile composite inclined pile brace at one time, which saved construction personnel and was tried in many projects. However, the construction speed of this construction device (patent number: 2022228701731) still cannot meet the needs of engineering, and the mixing drill rod set in the inner side of steel pipe is connected and removed for a long time. Engineering construction needs to further develop composite inclined pile brace construction device with higher construction speed and higher efficiency. SUMMARY

[0003] The utility model discloses a kind of self-drilling composite inclined pile support construction devices, the construction device is easy to install, construction speed is fast, construction quality is good, construction cost is low.

[0004] The self-drilling composite inclined pile support construction device includes a frame, a rotating device, an inclined pile steel pipe, a conical pile tip, a grout outlet hole, a stirring head, a grouting pipe, a grouting device, and a torsional grouting connector. The frame is a device that provides a counterforce and controls the position and direction of the inclined pile in the soil. The rotating device is a device that rotates the inclined pile steel pipe. The inclined pile steel pipe is a steel pipe that is inserted into the soil at an angle and serves as a support for the inclined pile. The conical pile tip is a component that reduces the resistance of the inclined pile steel pipe in the soil and increases the ability of the inclined pile steel pipe to avoid underground obstacles. The grout outlet hole is a passage at the bottom of the inclined pile steel pipe for injecting cement grout into the soil. The stirring head is a component that stirs and breaks up the soil. The grouting pipe is a hollow tubular component. The grouting device is a device that injects fluid into the soil. The torsional grouting connector is a device that injects fluid from the grouting pipe into the inclined pile steel pipe during the rotation of the inclined pile steel pipe. The torsional grouting connector includes an inner cylinder, an end plate, an outer sleeve, a positioning ring, a seal, a sealing fastener, and an outer sleeve fixing component. The inner cylinder is a hollow circular ring-shaped steel pipe that transmits torque. The end plate is a plate-shaped component that seals the end of the inner cylinder. The outer sleeve is a hollow ring-shaped steel pipe with an inner diameter larger than the outer diameter of the inner cylinder. The positioning ring is a component that controls the relative position of the seal between the inner cylinder and the outer sleeve along the axis of the inner cylinder. The seal is a component that seals the gap between the inner cylinder and the outer sleeve. The sealing fastener is a component that tightly contacts the seal with the inner cylinder and the outer sleeve by extrusion. The outer sleeve fixing component is a component that fixes the relative position of the outer sleeve 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 sleeve through the grouting pipe. The inner cylinder is connected to the outer sleeve through the opening. The inner cylinder is connected to the inclined pile steel pipe. The stirring head and the conical pile tip are connected to the bottom of the inclined pile steel pipe. The grout outlet hole is located at the bottom of the inclined pile steel pipe.

[0005] In the above-mentioned self-drilling composite inclined pile support construction device, the stirring head includes a stirring head support shaft and at least two stirring plates. The stirring plates rotate around the stirring head support shaft. The stirring head support shaft is fixed to the inclined pile steel pipe.

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

[0007] The self-drilling composite inclined pile support construction device takes the inclined pile steel pipe to be constructed as a part of the construction device, injects cement slurry into the soil around the inclined pile steel pipe and performs stirring to form a cement-soil mixed pile, drilling of the conical pile tip can avoid the engineering pile previously constructed in the soil, the conical pile tip can also serve as a drill bit, so that the resistance of the mixed pile penetrating the pit bottom is greatly reduced, the inclined mixed pile construction can be completed by using the construction device, then the PHC pipe pile is inserted into the soil outside the inclined pile steel pipe by using the guide construction method, the inclined pile steel pipe and the mixing head are recycled for reuse, the construction speed is fast, the construction quality is reliable, and the engineering cost is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 The self-drilling composite inclined pile support construction device structure structure schematic view used for the first embodiment of the utility model;

[0009] Figure 2 The torsional grouting connector structure schematic view used for the first embodiment of the utility model;

[0010] Figure 3 The multi-row hole flange plate structure schematic view used for the first embodiment of the utility model;

[0011] Figure 4 The flange plate structure schematic view used for the first embodiment of the utility model;

[0012] Figure 5 The positioning ring cross section structure schematic view used for the first embodiment of the utility model;

[0013] Figure 6 The collapsible mixing head working state cross section structure schematic view used for the second embodiment of the utility model;

[0014] Figure 7 The collapsible mixing head retracted state cross section structure schematic view used for the second embodiment of the utility model;

[0015] Figure 8 The collapsible mixing head cross section structure schematic view used for the second embodiment of the utility model. DETAILED DESCRIPTION

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

[0017] As a first embodiment of the present application, the following is described in conjunction with Figures 1-5The utility model discloses a kind of self-drilling composite inclined pile bracing construction devices, introduce the working principle, structure and its use method of the utility model of a kind of self-drilling composite inclined pile bracing construction device. First, introduce the working principle of the utility model. In the inclined pile bracing construction practice of foundation pit enclosure, the included angle of inclined pile bracing and vertical surface is generally close to 45 degrees, and construction site is very narrow outside foundation pit, and inclined pile bracing makes its construction technology more complicated than vertical or close to horizontal angle construction, on the one hand, to maintain the inclination of inclined pile in construction process, on the other hand, the top of inclined pile is high and far from construction operation surface, and the length of inclined pile bracing is long, generally 20~40m long, needs sectional construction, further increases construction difficulty. For self-drilling composite inclined pile bracing, the rigidity of drill pipe, drill pipe joint quantity, sectional drill pipe connection construction time has great influence on efficiency. The utility model uses mobile and flexible excavator and lengthened arm excavator, realizes the construction of inclined pile bracing in the inside of foundation pit, solves the narrow problem of construction operation surface of composite inclined pile bracing, solves the problem of too many sectional mixing drill pipes in oblique construction by combining the characteristics of larger diameter of inclined pile steel pipe and longer arm of excavator, uses the mature advantages of power device connected with excavator, combines the twist grouting connector proposed in the utility model, realizes the use of larger diameter inclined pile steel pipe itself as drill pipe for oblique mixing pile rapid construction, and realizes the strict core of construction mixing pile and inclined pile bracing full length, can greatly improve construction efficiency, ensure construction quality. The utility model discloses a kind of self-drilling composite inclined pile bracing construction devices, including rack, rotating device, inclined pile steel pipe, conical pile tip, slurry hole, stirring head, grouting pipe, grouting device, twist grouting connector nine parts, wherein the rack is the device that provides counterforce and has the function of controlling the position and direction of inclined pile into soil, can use excavator or lengthened wall arm excavator as rack, the mobility of excavator is good, facilitate pile body placement, inclination adjustment and pile connection during inclined pile construction, construction speed is fast, can use lengthened arm excavator as rack, lengthened arm can improve the construction length of single section pile, improve construction efficiency. When using excavator as rack, the excavator bucket can be removed, and the rotating device is driven by the oil pump that drives the excavator bucket to rotate. The rotating device is the device with the function of driving the inclined pile steel pipe to rotate, in the embodiment, spiral drill machine can be used as rotating device, which can be connected with the power oil pipe used to drive the excavator bucket, and the hydraulic drive system of the excavator is used to drive the spiral drill machine to rotate to provide rotating power. In the embodiment, an electric motor can also be used as a rotating device. The inclined pile steel pipe is a steel pipe that can be used as an inclined pile support for oblique insertion into soil, in the embodiment, the inclined pile steel pipe should have 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, and the inclined pile steel pipe should have the required torsional bearing capacity for mixing soil. In the embodiment, the inclined pile steel pipe can also be a sectional sleeve connected with the inclined pile. The conical pile tip is a component that reduces the resistance of the inclined pile steel pipe into soil and increases the ability of the inclined pile steel pipe to avoid underground obstacles, in the embodiment, a steel pile tip commonly used in prefabricated piles can be welded at the bottom of the inclined pile steel pipe as a conical 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 squeezing the sealing member so that the sealing member is in close contact with the inner sleeve and the outer sleeve, and can be, for example. Figure 2The flange plate placed outside the inner cylinder is used as a sealing fastener, the sealing fastener is pressed against the positioning ring by tightening the bolts, the positioning ring is pressed against the sealing member, the height of the sealing member in the axial direction of the inner cylinder is compressed, the sealing member is expanded in the radial direction of the inner cylinder, and the sealing member is in close contact with the outer surface of the inner cylinder and the inner surface of the outer sleeve, thereby achieving the sealing purpose. The outer sleeve fixing member is a member for fixing the relative position of the outer sleeve and the rotating device. In this embodiment, the main function of the outer sleeve fixing device is to balance the force transmitted to the outer sleeve during the rotation of the inner cylinder, and to keep the outer sleeve in a non-rotating state. It can be made of a steel member connected to the rack or the power device. In this embodiment, the inner cylinder, the outer sleeve and the inclined pile steel pipe are all provided with grout inlet holes, so that the cement grout can only flow in or out of the grout inlet holes during the rotation of the inclined pile steel pipe. The rack is connected to the rotating device, the rotating shaft of the rotating device is connected to the inner cylinder through the power device connector, the power device connector can be provided by the rotating device manufacturer, and the power device connector has the function of transmitting the torque of the rotating shaft and is convenient to install and remove. The inner cylinder is connected to the inclined pile steel pipe, the grouting device is connected to the outer sleeve through the grouting pipe, the inner cylinder is connected to the outer sleeve through the opening, the inner cylinder is connected to the inclined pile steel pipe, the stirring head and the conical pile tip are connected to the bottom of the inclined pile steel pipe, and the grout outlet hole 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 supporting construction device. This embodiment takes a two-section pile as an example for introduction, the pile length for construction is set to 30 m, the length of the first section pile can be set to 17 m, the length of the second section pile can be set to 13 m, the inclined pile steel pipe adopts a steel pipe with an outer diameter of 325 mm, the joint sleeve of the inclined pile steel pipe adopts a steel pipe pile with an outer diameter of 351 mm, a 600 excavator with a lengthened mechanical arm is used as the rack, before construction, the oil pipe connected to the excavator bucket is connected to the rotating device, the rotating device is driven to rotate by the excavator oil pump, and the rotating device is connected to the torsional grouting connector, the grouting device is connected to the torsional grouting connector through the grouting pipe. Figure 2 As shown in the figure. Then the joint sleeve is connected to the torsional grouting device, as shown in Figure 1 As shown in the figure. Then the joint sleeve is connected to the torsional grouting device, as shown in Figure 1 As shown in the figure. Then the joint sleeve is connected to the torsional grouting device, as shown in Figure 2 As shown in the figure. Then the joint sleeve is connected to the torsional grouting device, as shown in Figure 2 As shown in the figure. Then the joint sleeve is connected to the torsional grouting device, as shown in Figure 3 As shown in the figure. Then the joint sleeve is connected to the torsional grouting device, as shown in Figure 2The construction is started after the construction preparation is completed. In the first step, the first pile section is connected with the joint sleeve pipe by full welding. After the first step is completed, the second step is entered. In the second step, the first pile section is lifted by the excavator and placed at the pile position, and the inclination of the inclined pile pipe is adjusted by the excavator to meet the design requirements. After the second step is completed, the third step is entered. In the third step, the excavator drives the rotating device to rotate the inclined pile pipe, and the excavator arm applies a slanting pressure to the inclined pile to make the inclined pile pipe rotate and enter the soil, and the grouting pump injects grout into the soil through the torsional grouting connector to construct the mixing pile reinforcement body. In the third step, the torsional grouting connector is designed, the grouting pipe is connected with the outer sleeve of the torsional grouting connector, and the outer sleeve does not rotate, so that the grouting can be continuously performed during the rotation of the inclined pile pipe until the first section of the inclined pile pipe is driven into the predetermined position. After the third step is completed, the fourth step is entered. In the fourth step, the joint sleeve pipe is cut at a position 100-200 mm above the top of the first section of the inclined pile pipe, and the remaining joint sleeve pipe on the torsional grouting connector is connected with the second pile section by full welding. After the fourth step is completed, the fifth step is entered. In the fifth step, the second section of the inclined pile pipe is first lifted by the excavator to the upper side of the first section of the inclined pile pipe, and the second section of the inclined pile pipe is connected with the first section of the inclined pile pipe by welding. After the fourth step is completed, the fifth step is entered. The third step is repeated in the fifth step, the second section of the inclined pile pipe is driven into the soil, and then the joint sleeve pipe is cut, that is, the self-drilling composite inclined pile support construction device is used 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, the tapered pile tip is provided in the construction process, and the tapered pile tip rotates continuously during the insertion into the soil. For the commonly used circular cross-section bored piles and PHC pipe piles, the tapered pile tip can be successfully avoided in the construction process. In addition, the tapered pile tip can be in the form of a cross plate welded, and can also be used as a drill bit of a drilling machine, so that the bottom reinforcement of the mixing pile pit can be penetrated. The completed dozens of 30-meter-long composite inclined pile supports have a large number of engineering piles and pit bottom cement-soil mixing pile reinforcements below the bottom of the foundation pit. All the composite inclined pile supports are not reworked or re-constructed by pulling out the piles due to the engineering piles and the pit bottom reinforcement. The engineering practice has proved that the construction device has strong obstacle avoidance and penetration ability.

[0018] As a second embodiment of the utility model, the guide construction method (patent number: ZL2010105853341) designed by the designer of the utility model is mainly introduced. After the construction of the mixing pile is completed, the hollow prefabricated PHC pipe pile is inserted along the periphery of the inclined pile pipe to form a composite inclined pile support, and the inclined pile pipe is pulled out for repeated use after the construction is completed. First, the construction of the composite inclined pile support is introduced in combination with the guide construction method (patent number: ZL2010105853341) designed by the designer of the utility model. Figures 6-8, introduces the structure, working principle and use method of the utility model. In the first embodiment, the inclined pile steel pipe can be directly used as an inclined pile support. In this embodiment, the construction of the mixing pile with a diameter larger than the outer diameter of the PHC pipe pile is completed by setting the retractable mixing head. After the construction of the mixing pile is completed, the PHC pipe pile is sleeved on the outer side of the inclined pile steel pipe, and the PHC pipe pile is obliquely driven into the un-solidified mixing pile of the oblique construction by the steel sheet pile driver, thereby serving as an inclined pile support. During the driving of the PHC pipe pile, the inclined pile steel pipe is set in the hollow part of the PHC pipe pile as a construction guide rod, and the PHC pipe pile is inserted into the soil along the axis of the previously constructed mixing pile by using the guide construction method. On the one hand, the core alignment quality control requirement of the mixing pile and the PHC pipe pile is ensured, and on the other hand, the inclined pile steel pipe avoids the previously constructed engineering pile and the pit bottom reinforced mixing pile by using the conical pile tip during the construction of the mixing pile. The PHC pipe pile can be inserted into the soil along the inclined pile steel pipe and can avoid the previously constructed engineering pile and the pit bottom reinforced mixing pile, and the oblique PHC pipe pile driving construction is successfully completed. After the oblique PHC pipe pile driving construction is completed, the inclined pile steel pipe can be pulled out from the hollow part of the PHC pipe pile by using the steel sheet pile driver. When the inclined pile steel pipe is pulled out, the retractable mixing head is retracted under the resistance of the side wall of the PHC pipe pile and is pulled out from the hollow part of the PHC pipe pile for reuse. In this embodiment, the structure of the retractable mixing head can be set as shown in Figures 6-8 , as shown in Figure 6 and Figure 8 , the retractable mixing head can be set as scissors, the retractable mixing head is composed of two mixing plates intersecting with each other, a mixing head support shaft is arranged at the intersection part of the two mixing plates, the two mixing plates intersecting with each other can rotate around the mixing head support shaft respectively, and 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 with the inclined pile steel pipe, as shown in Figures 6-8 . In this embodiment, a spring can also be arranged between the retractable mixing head and the inclined pile steel pipe. When the mixing pile of the composite inclined pile support is constructed, the retractable mixing head is opened by using the spring tension, the side wall of the inclined pile steel pipe can prevent the mixing plate from turning upward, and a stable shape is formed, as shown in Figure 6 , so that the mixing pile can be constructed in the soil. When the inclined pile steel pipe is pulled out after the construction of the mixing pile is completed, the retractable mixing head is pushed by the side wall of the PHC pipe pile, and the retractable mixing head is retracted, as shown in Figure 7The illustrated retracted state facilitates the retraction of the retractable mixing head from the hollow part of the PHC pipe pile for reuse. In this embodiment, the tapered pile tip and the mixing head can also be left in the oblique mixing pile, and a square mortise and tenon structure (Patent No. 2022228701731) designed by the designer of the utility model is arranged at the bottom of the oblique steel pipe to achieve the anti-torsion connection between the mixing head and the tapered pile tip and the oblique pile steel pipe, and at the same time, the oblique pile steel pipe and the mixing head can be separated under the action of tension, thereby realizing the recycling of the oblique pile steel pipe.

[0019] The patent includes but is not limited to other construction devices that can be used by professionals in the field.

Claims

1. A self-drilling composite batter pile bracing construction device, characterized in that The device comprises a rack, a rotating device, a steel pipe, a tapered pile tip, a slurry outlet, a stirring head, a grouting pipe, a grouting device, and a torsion grouting connector. The rack provides a counterforce and controls the position and direction of the steel pipe. The rotating device drives the steel pipe to rotate. The steel pipe is inserted into the soil. The tapered pile tip reduces the resistance of the steel pipe and increases the ability to avoid underground obstacles. The slurry outlet is located at the bottom of the steel pipe and is used to inject cement slurry into the soil. The stirring head stirs and breaks the soil. The grouting pipe is a hollow pipe. The grouting device injects fluid into the soil. The torsion grouting connector injects fluid into the steel pipe during rotation. The torsion grouting connector comprises an inner cylinder, an end plate, an outer sleeve, a positioning ring, a sealing element, a sealing fastener, and an outer sleeve fixing member. The inner cylinder is a hollow circular ring-shaped steel pipe that transmits torque. The end plate blocks the end of the inner cylinder. The outer sleeve is a hollow ring-shaped steel pipe with a larger inner diameter than the outer diameter of the inner cylinder. The positioning ring controls the relative position of the sealing element along the axis of the inner cylinder. The sealing element blocks the gap between the inner cylinder and the outer sleeve. The sealing fastener tightly contacts the inner cylinder and the outer sleeve by pressing the sealing element. The outer sleeve fixing member fixes the relative position of the outer sleeve and the rotating device. The rack 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 steel pipe. The grouting device is connected to the outer sleeve through the grouting pipe. The inner cylinder is connected to the outer sleeve through the opening. The stirring head and the tapered pile tip are connected to the bottom of the steel pipe.

2. The self-drilling composite batter pile bracing construction device according to claim 1, characterized in that The stirring head comprises a stirring head support shaft and at least two stirring plates. The stirring plates rotate around the stirring head support shaft. The stirring head support shaft is fixed to the steel pipe.

3. The self-drilling composite batter pile bracing construction apparatus according to claim 2, characterized in that A spring is arranged between the stirring plate and the steel pipe to balance the weight of the stirring plate.

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