Large-diameter deep hole socketed pile

Abstract

The invention relates to the technical field of pile foundation structures, and particularly provides a large-diameter deep-hole socketed pile. Comprising multiple sections of variable-diameter reinforcement cages poured in concrete, and the multiple sections of variable-diameter reinforcement cages can be in butt joint end to end; the variable-diameter reinforcement cage comprises a variable-diameter framework, a variable-diameter cage and a plurality of groups of self-locking pieces; the variable-diameter cage comprises a plurality of main reinforcements which are circumferentially distributed around the variable-diameter framework, at least two connecting rods are hinged between each main reinforcement and the variable-diameter framework, and a plurality of spiral stirrups are jointly wound and mounted on the peripheries of the main reinforcements; when the variable-diameter frameworks which are sequentially connected in series are pressed downwards to apply force, the variable-diameter frameworks open the multiple sets of main reinforcements through the connecting rods, the radius of the spiral stirrups is increased accordingly, and self-locking is completed through the self-locking pieces and the connecting rods. According to the socketed pile, the situation that a variable-diameter reinforcement cage with the corresponding depth needs to be manufactured in advance each time is avoided, the construction flexibility is improved, and the early-stage material preparation period is greatly shortened.

Description

Technical Field

[0001] This invention relates to the field of pile foundation technology, and specifically proposes a large-diameter deep-hole rock-socketed pile. Background Technology

[0002] Rock-socketed piles are an important type of pile in pile foundation engineering. They belong to the cast-in-place pile category. Their core feature is that the lower part of the pile body is embedded in the bedrock to a certain depth. The pile body and the bedrock are embedded together, and the pile side friction and pile end resistance jointly bear the load of the superstructure. They are widely used in high-rise buildings, bridges, ports and wharves, water conservancy projects and other scenarios with high requirements for foundation bearing capacity and complex geological conditions (such as thin overburden and hard bedrock under soft soil foundations).

[0003] A rock-socketed pile consists of an upper section penetrating the soil layer and a lower section embedded in the rock. Drilling equipment is used to continuously drill holes from the soil layer to the rock layer in the foundation, and a reinforcing cage is placed inside the pile hole. Concrete is then poured to form a single, integral structure, embedding the pile into the rock layer to form the pile foundation. During design and construction, the structural design must be strictly integrated with the geological survey results. Multiple factors, including engineering geological conditions, pile type function, load requirements, and design specifications, must be considered to determine the overall depth of the lower rock-socketed section. Therefore, the embedment depth of the rock-socketed pile varies under different conditions. Under normal conditions, the rock-socketed pile primarily provides stable bearing capacity; however, the specific depth required varies depending on the actual engineering project. In application scenarios such as rock-socketed piles as foundations for tall buildings, bearing the buoyancy of underground structures, serving as foundations for marine and waterway engineering facilities, and operating in environments prone to vibration and settlement, rock-socketed piles also need to provide effective pull-out resistance to ensure the stability and safety of the pile foundation. Under current technology, pull-out resistance can be improved by increasing the depth of the rock-socketed section, strengthening the reinforcement cage, and using enlarged-base rock-socketed piles. The enlarged-base method involves drilling further to increase the diameter of the rock-socketed section, using a variable-diameter reinforcement cage for enlarged-base filling. The variable-diameter reinforcement cage is connected to the bottom of the existing fixed-structure reinforcement cage, which is located in the rock-socketed section. However, as previously known, the depth of the rock-socketed section embedded in the rock strata is not fixed. Therefore, currently, only a certain length of variable-diameter reinforcement cage can be prefabricated according to the designed rock-socketed section depth. This results in incompatibility at different depths, requiring re-fabrication, which reduces flexibility and significantly increases the material preparation period before construction. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a large-diameter deep-hole rock-embedded pile, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention employs the following technical solution: a large-diameter deep-hole rock-embedded pile, comprising a multi-section variable-diameter steel cage cast in concrete, the multi-section variable-diameter steel cage being able to be joined end-to-end; the variable-diameter steel cage includes a variable-diameter skeleton, a variable-diameter cage, and multiple sets of self-locking components; both ends of the variable-diameter skeleton are fixed with docking components that can cooperate and assemble with each other; the variable-diameter cage includes multiple main bars distributed circumferentially around the variable-diameter skeleton, each main bar having at least two connecting rods hinged to the variable-diameter skeleton, and the variable-diameter skeleton having limiting positions for restricting the positions of the connecting rods; both ends of each main bar are fixed with plug-in components that can be inserted and engaged with each other; multiple spiral stirrups are wound around the periphery of the multiple main bars; multiple sets of self-locking components are assembled on the variable-diameter skeleton and are distributed correspondingly to the multiple connecting rods hinged on the same main bar; each set of self-locking components has the same number as the main bars, and multiple self-locking components in each set are self-locked with the corresponding multiple connecting rods one by one.

[0006] When multiple variable diameter steel bars are joined end to end, the multiple variable diameter skeletons are fixed and connected in series through the joining components, and the main bars at relatively opposite positions are connected in series through the plug-in components.

[0007] When the variable diameter skeleton is pressed down in sequence, the variable diameter skeleton opens up multiple sets of main bars through the connecting rod, and the radius of the spiral stirrup increases accordingly. When the connecting rod reaches the limit position, the self-locking component and the connecting rod complete the self-locking.

[0008] Preferably, the variable diameter skeleton includes two end pieces distributed vertically and a connecting column fixed between the two end pieces; hinge sleeves are fitted and fixed at both ends of the main rib, and connecting rods are correspondingly hinged between the two hinge sleeves and the two end pieces; a set of self-locking components is assembled in each of the two end pieces.

[0009] Preferably, the end member includes a cylindrical silo and an end plate fixed to the top of the cylindrical silo; the upper and lower ends of the connecting column are respectively fixed to the bottom end of the cylindrical silo of the upper end member and the top end of the end plate of the lower end member; one end of the connecting rod is hinged to the outer wall of the cylindrical silo; a set of self-locking components are assembled inside the cylindrical silo.

[0010] Preferably, multiple self-locking components in a group are distributed circumferentially around the center of the silo; the self-locking component includes a sliding seat that is slidably installed in the silo along the radial direction of the silo, a locking pin that is fixed on the sliding seat, the locking pin that is slidably installed through the side wall of the silo, a spring that is sleeved on the locking pin, and the two ends of the spring are fixed to the sliding seat and the inner wall of the silo; a locking hole that engages with the locking pin is provided at the end of the connecting rod away from the hinge sleeve; when not self-locking, the end of the connecting rod is in contact with the locking pin.

[0011] Preferably, the plug-in assembly includes a plug-in cylinder fixed to the top of the upper hinge sleeve and a plug-in rod fixed to the bottom of the lower hinge sleeve, the plug-in rod being able to plug into the plug-in cylinder.

[0012] Preferably, the docking assembly includes a docking cylinder fixed to the top of the upper end plate and a rotating seat fixed to the bottom of the lower cylindrical silo, with a rotating sleeve rotatably mounted on the rotating seat that can engage with the threaded connection of the docking cylinder.

[0013] Preferably, there are an even number of main reinforcing bars, and each of the alternating main reinforcing bars is slidably engaged with both ends of a spiral stirrup. The middle part of the spiral stirrup is fixed to another main reinforcing bar. The main reinforcing bars that are slidably engaged with the spiral stirrup and the main reinforcing bars that are fixed to the spiral stirrup are in relative positions along the diameter of the distribution circle of the multiple main reinforcing bars.

[0014] Preferably, a ball bearing is movably embedded at the bottom end of the plug rod.

[0015] Preferably, both ends of the spiral stirrup are provided with sliding buckles that slide in conjunction with the main reinforcement.

[0016] The above technical solution has the following advantages or beneficial effects: This invention provides a large-diameter deep-hole rock-socketed pile. For rock-socketed piles that require additional pull-out resistance, a standardized and multi-section assembly variable-diameter steel cage is set in the steel cage structure of the rock-socketed pile. When dealing with rock-socketed sections of different depths, the variable-diameter steel cage can be quickly assembled by docking, avoiding the need to pre-fabricate the corresponding depth of the variable-diameter steel cage each time, improving the flexibility of construction, and greatly shortening the cycle of material preparation in the early stage. In addition, in the variable-diameter steel cage, on the one hand, the quick docking between the variable-diameter skeletons can be completed by docking components, and on the other hand, the series docking between the main bars can be completed by plug-in components. From the inside out, the connection strength and integrity of the docking between the multiple sections of variable-diameter steel cages are synchronously guaranteed. The direct pressing diameter-changing design is adopted, and synchronous self-locking can be performed in the diameter-changing adjustment. The operation is simple and convenient, and the series docking between the diameter-changing cages ensures the synchronicity of the diameter-changing adjustment action and the consistency of the adjustment state. Attached Figure Description

[0017] The invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings, which are not intentionally drawn to scale; the focus is on illustrating the spirit of the invention.

[0018] Figure 1 This is a three-dimensional structural diagram of a variable-diameter steel reinforcement cage.

[0019] Figure 2 This is a front view of two sections of variable-diameter steel cages joined together.

[0020] Figure 3 yes Figure 2 Cross-sectional view of AA.

[0021] Figure 4 It is a three-dimensional sectional view of a set of self-locking components assembled in the end piece.

[0022] Figure 5 It is a three-dimensional sectional view of a single self-locking component assembled with a silo.

[0023] Figure 6 This is a three-dimensional structural diagram of the variable diameter cage.

[0024] Figure 7 It is a top view of multiple spiral stirrups and multiple main bars wrapped together.

[0025] Figure 8 This is a three-dimensional structural diagram of a spiral stirrup.

[0026] In the diagram: 1. Variable diameter cage; 11. End piece; 12. Cylindrical silo; 121. Guide bar; 13. End plate; 131. Limiting ring; 14. Connecting column; 15. Docking assembly; 151. Docking cylinder; 152. Rotating seat; 153. Rotating sleeve; 2. Variable diameter cage; 21. Main rib; 211. Hinge sleeve; 22. Connecting rod; 221. Locking insertion hole; 23. Spiral stirrup; 231. Sliding buckle; 24. Plug-in assembly; 241. Plug-in cylinder; 242. Plug-in rod; 243. Ball bearing; 3. Self-locking component; 31. Sliding seat; 32. Locking pin; 33. Spring. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1 and Figure 2 As shown, a large-diameter deep-hole rock-socketed pile includes multiple sections of variable-diameter steel cages cast in concrete, which can be connected end to end. It should be noted that the variable-diameter steel cages are prefabricated components of standard length. According to the depth of the rock-socketed section of the rock-socketed pile in the construction design, several sections of variable-diameter steel cages are selected and connected for assembly. In addition, the rock-socketed pile also includes a fixed structural steel cage cast in concrete, which is connected to the top of the multiple sections of variable-diameter steel cages.

[0030] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the variable diameter steel cage includes a variable diameter skeleton 1; the variable diameter skeleton 1 includes two end pieces 11 distributed vertically and vertically, and a connecting column 14 fixed between the centers of the two end pieces 11; it should be noted that here, the vertical position is based on the posture of the variable diameter steel cage when it is vertically inserted into the rock-socketed pile duct. The end piece 11 includes a cylindrical hopper 12 and an end plate 13 welded to the top of the cylindrical hopper 12; the upper and lower ends of the connecting column 14 are respectively welded to the bottom of the cylindrical hopper 12 of the upper end piece 11 and the top of the end plate 13 of the lower end piece 11; in order to allow the concrete to flow and fill in the structure during pouring, both the cylindrical hopper 12 and the end plate 13 have holes in their centers, and the connecting column 14 is a circular tube structure with through holes in its side wall. Two end pieces 11 are fixed with docking components 15 that can be assembled and connected to each other; the docking components 15 include a docking cylinder 151 welded to the top of the upper end plate 13 and a rotating seat 152 welded to the bottom of the lower cylindrical hopper 12. A rotating sleeve 153 that can be threadedly engaged with the docking cylinder 151 is rotatably installed on the rotating seat 152.

[0031] like Figure 1 , Figure 2 , Figure 3 and Figure 6 As shown, a variable diameter cage 2 is assembled around the outer periphery of the variable diameter frame 1; the variable diameter cage 2 includes six main ribs 21 evenly distributed around the circumference of the variable diameter frame 1; the two ends of the main ribs 21 are fitted with hinged sleeves 211, and each of the two hinged sleeves 211 is hinged with a connecting rod 22, and the other end of the two connecting rods 22 is correspondingly hinged to the outer wall of the two cylindrical silos 12; each main rib 21 is hinged to the variable diameter frame 1 through two connecting rods 22, which is equivalent to forming a deformable parallelogram structure, and the main ribs 21 always remain parallel to the connecting column 14. The hinge sleeves 211 located at both ends of the main rib 21 are fixed with plug-in components 24 that can be plugged into each other; the plug-in components 24 include a plug-in cylinder 241 sleeved and welded to the top of the upper hinge sleeve 211 and a plug-in rod 242 sleeved and welded to the bottom of the lower hinge sleeve 211. The plug-in rod 242 can be plugged into the plug-in cylinder 241; a ball bearing 243 is movably embedded at the bottom of the plug-in rod 242.

[0032] like Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7 and Figure 8As shown, three spiral stirrups 23 are wound around the periphery of the six main reinforcing bars 21. The spiral stirrups 23 are made of alloy steel wire, which has high elasticity and can adapt to elastic deformation. The spiral reinforcing bars have sliding buckles 231 at both ends. The alternating main reinforcing bars 21 are all slidably engaged with the sliding buckles 231 at both ends of one spiral stirrup 23, and the middle of the spiral stirrup 23 is welded to another main reinforcing bar 21. The main reinforcing bars 21 that are slidably engaged with the spiral stirrups 23 and the main reinforcing bars 21 that are fixed to the spiral stirrups 23 are located in relative positions along the diameter of the distribution circle of the six main reinforcing bars 21. It should be noted that in this embodiment, the spiral stirrups 23 are basically centered relative to the two ends of the main reinforcing bars 21, so the welding point of the spiral stirrups 23 is approximately located at the midpoint. Under the constraint of the three spiral stirrups 23, the six main reinforcing bars 21 are evenly distributed around the variable diameter skeleton 1.

[0033] like Figure 3 , Figure 4 and Figure 5 As shown, each of the two cylindrical silos 12 is equipped with a set of self-locking components 3, with six self-locking components 3 in each set. Six guide bars 121 are welded to the inner end face of the cylindrical silo 12, evenly distributed around the center of the cylindrical silo 12, with the guide bars 121 guiding in a radial direction along the cylindrical silo 12. Six connecting rods 22 hinged to the same cylindrical silo 12 form a set, with two sets of connecting rods 22 corresponding to two sets of self-locking components 3, and each of the six self-locking components 3 in one set corresponding to one of the six connecting rods 22 in the same set. The six self-locking components 3 are correspondingly installed on the six guide bars 121. Each self-locking component 3 includes a sliding seat 31 slidably mounted on the guide bar 121, with a locking pin 32 welded to the sliding seat 31. The locking pin 32 slidably penetrates the side wall of the cylindrical silo 12, with the end of the locking pin 32 being a semi-circular shape. The ball joint structure; a spring 33 is sleeved on the locking pin 32, and the two ends of the spring 33 are welded to the sliding seat 31 and the inner wall of the cylindrical chamber 12; a locking hole 221 is opened on the end of the connecting rod 22 away from the hinge sleeve 211, which is engaged with the locking pin 32; a limiting ring 131 aligned with the edge is provided at the bottom end of the end plate 13, which serves as the limiting position for the six connecting rods 22; when not self-locking, the connecting rod 22 and the locking pin 32 are in contact, while the spring 33 is in a stretched state.

[0034] When constructing rock-socketed piles, the foundation must first be drilled using drilling equipment. During drilling, the pile first passes through the soil layer and then enters the rock layer. As drilling progresses, the soil layer can be supported and reinforced simultaneously using a sleeve. Then, drilling continues in the rock layer to the corresponding design depth. Next, further enlargement drilling is carried out in the rock layer until the enlarged section of the rock layer reaches the design depth.

[0035] After the pile foundation duct is drilled, the steel reinforcement structure for the rock-socketed piles can be placed in. The steel reinforcement structure needs to be vertically hoisted into the duct using an existing crane. Because this is deep-hole rock-socketed pile construction, the duct is quite deep, and the rock-socketed section of the pile is not short. Multiple sections of variable-diameter steel cages need to be assembled together. To facilitate hoisting, the multiple sections of variable-diameter steel cages can be pre-divided into groups, and the sections in each group can be pre-assembled together. During hoisting, one group of assembled variable-diameter steel cages is first hoisted and placed into the duct. Then, the sections are assembled one by one and lowered one by one. After all the sections of the variable diameter steel cage are placed, the fixed structural steel cage can be connected to the end plate 13 at the top of the top variable diameter steel cage. The fixed structural steel cage can be fixed to the end plate 13 by welding or flange connection. It should be noted that the fixed structural steel cage usually also needs to be connected and placed one by one. Multiple sections of fixed structural steel cage can be connected by binding with iron wire. As it is lowered, the steel cage is placed into the bottom of the duct. After placement, it is kept in the hoisting state.

[0036] The following provides a detailed explanation of the assembly of reducing diameter steel cages. The assembly method is the same for each segment; however, we will use the assembly of two reducing diameter steel cage segments as an example. For ease of explanation, the two segments will be referred to as reducing diameter cage segment one and reducing diameter cage segment two, respectively. The state of the two reducing diameter steel cage segments after assembly can be seen in the image below. Figure 2 and Figure 3 As shown, specifically, the six plug-in rods 242 in the two-section variable diameter steel cage are aligned one by one with the six plug-in sleeves 241 of the first-section variable diameter steel cage and inserted. Then, the rotating sleeve 153 of the two-section variable diameter steel cage is rotated and screwed into the connecting sleeve 151 of the first-section variable diameter steel cage, so that the rotating sleeve 153 and the connecting sleeve 151 are connected by a threaded fit. When the rotating sleeve 153 is fully screwed onto the connecting sleeve 151, the plug-in rods 242 are inserted to the deepest point of the plug-in sleeves 241. The two sections of variable diameter steel cages are connected segment by segment through the threaded connection between the rotating sleeve 153 and the connecting sleeve 151. The main reinforcement 21 is connected in series through the corresponding plug-in connection between the plug-in rods 242 and the plug-in sleeves. This enhances the integrity of the multiple sections of variable diameter steel cages and ensures that the variable diameter cage 2 of each section of variable diameter steel cage maintains the synchronicity of the adjustment action and the consistency of the adjusted state during the diameter adjustment process.

[0037] After the entire reinforcing cage is placed, the six splice rods 242 in the bottommost variable-diameter reinforcing cage roll into contact with the rock stratum duct surface via ball bearings 243. Then, the diameter is adjusted. While maintaining the hoisting state, the upper multi-segment connected fixed-structure reinforcing cage is pressed down. During the pressing process, the crane end is pre-synchronized downwards, and the fixed-structure reinforcing cage indirectly presses against the multi-segment connected variable-diameter skeleton 1. The variable-diameter skeleton 1 descends synchronously with the fixed-structure reinforcing cage. During the descent, the end piece 11 drives the main reinforcement 21 to move away from the center of the variable-diameter skeleton 1 via connecting rod 22. At this time, the main reinforcement 21, which are connected segment by segment, remain synchronized. Subsequently, the main reinforcement 21 expands the spiral stirrups 23, and the spiral... With the stirrup 23 fixed in the middle, its two sliding buckles 231 slide towards each other on the main reinforcement 21, gradually increasing in radius. The reducing cage 2 achieves the effect of expanding its diameter. As it is gradually pressed down, when the connecting rod 22 rotates around the hinge of the end piece 11 to a horizontal state, the connecting rod 22 contacts the limiting ring 131, and the connecting rod 22 and the end piece 11 restrain each other. The reducing cage 1 descends to its lowest position. At this time, the locking hole 221 is aligned with the locking pin 32. Under the elastic force of the spring 33, the locking pin 32 automatically springs into the locking hole 221, and the self-locking member 3 completes the self-locking of the connecting rod 22. The radius of the reducing cage 2 reaches its maximum, and in the locked state, the reducing cage 2 maintains its maximum radius. It should be noted that when the locking state is reached, the rotating sleeve 153 of the reducing cage at the bottom is still higher than the ball bearing 243 and does not contact the ground. That is, the ground of the rock stratum duct will not cause any resistance or interference to the reducing process.

[0038] After the diameter of the variable-diameter steel cage is adjusted, concrete can be poured into the duct. After the concrete has solidified, a rock-socketed pile is formed embedded in the rock strata.

[0039] This invention provides a large-diameter deep-hole rock-socketed pile. For rock-socketed piles requiring additional pull-out resistance, a standardized, multi-section, butt-and-assembled variable-diameter steel cage is incorporated into the steel cage structure. This allows for rapid assembly of the variable-diameter steel cages to accommodate rock-socketed sections of varying depths, avoiding the need for pre-fabrication of steel cages of corresponding depths each time. This improves construction flexibility and significantly shortens the initial material preparation cycle. Furthermore, within the variable-diameter steel cage, quick connection between the variable-diameter skeletons 1 can be achieved via the connecting component 15, while the main reinforcement 21 can be connected via the plug-in component 24. This synchronous connection from the inside out ensures the strength and integrity of the joints between the multiple sections of the variable-diameter steel cages. The direct downward-pressing variable-diameter design allows for synchronous self-locking during diameter adjustment, making operation simple and convenient. The series connection between the variable-diameter cages 2 ensures the synchronicity of the diameter adjustment action and the consistency of the adjustment state.

[0040] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and the devices and structures not described in detail should be understood as being implemented in a manner common to the art; any possible variations and modifications made by those skilled in the art without departing from the technical solution of the present invention, or equivalent embodiments with equivalent changes, do not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A large-diameter deep-hole rock-embedded pile, characterized in that: This includes multiple sections of variable-diameter reinforcing cages cast in concrete, which can be connected end-to-end; the variable-diameter reinforcing cages include: The variable diameter frame has docking components fixed at both ends that can be assembled and connected with each other; The variable diameter cage includes multiple main ribs distributed circumferentially around the variable diameter skeleton. Each main rib is hinged to the variable diameter skeleton with at least two connecting rods. The variable diameter skeleton is provided with limiting positions that restrict the position of the connecting rods. Each main rib has plug-in components that can be plugged into each other at both ends. Multiple spiral stirrups are wound around the periphery of the multiple main ribs. And multiple sets of self-locking components are assembled on the variable diameter skeleton and are distributed correspondingly to multiple connecting rods hinged on the same main rib; the number of self-locking components in each set is the same as the number of main ribs, and multiple self-locking components in each set are self-lockingly engaged with multiple connecting rods distributed accordingly. When multiple variable diameter steel bars are joined end to end, the multiple variable diameter skeletons are fixed and connected in series through the joining components, and the main bars in relatively opposite positions are connected in series through the plug-in components. When the variable diameter skeleton is pressed down in sequence, the variable diameter skeleton opens up multiple sets of main bars through the connecting rod, and the radius of the spiral stirrup increases accordingly. When the connecting rod reaches the limit position, the self-locking component and the connecting rod complete the self-locking.

2. The large-diameter deep-hole rock-embedded pile according to claim 1, characterized in that: The variable diameter frame includes two end pieces distributed vertically and a connecting column fixed between the two end pieces; hinge sleeves are fitted and fixed at both ends of the main rib, and connecting rods are correspondingly hinged between the two hinge sleeves and the two end pieces; a set of self-locking components is assembled in each of the two end pieces.

3. A large-diameter deep-hole rock-embedded pile according to claim 2, characterized in that: The end piece includes a cylindrical silo and an end plate fixed to the top of the cylindrical silo; the upper and lower ends of the connecting column are respectively fixed to the bottom end of the cylindrical silo of the upper end piece and the top end of the end plate of the lower end piece. One end of the connecting rod is hinged to the outer wall of the silo; a set of self-locking components is assembled inside the silo.

4. A large-diameter deep-hole rock-embedded pile according to claim 3, characterized in that: Multiple self-locking components are distributed circumferentially around the center of the silo in a set; the self-locking component includes a sliding seat that is slidably installed in the silo along the radial direction of the silo, a locking pin that is fixed on the sliding seat, the locking pin that is slidably installed through the side wall of the silo, a spring that is sleeved on the locking pin, and the two ends of the spring are fixed to the sliding seat and the inner wall of the silo; a locking hole that engages with the locking pin is provided at the end of the connecting rod away from the hinge sleeve; when not self-locking, the end of the connecting rod is in contact with the locking pin.

5. A large-diameter deep-hole rock-embedded pile according to claim 2, characterized in that: The plug-in assembly includes a plug-in cylinder fixed to the top of the upper hinge sleeve and a plug-in rod fixed to the bottom of the lower hinge sleeve. The plug-in rod can be plugged into the plug-in cylinder.

6. A large-diameter deep-hole rock-embedded pile according to claim 3, characterized in that: The docking assembly includes a docking cylinder fixed to the top of the upper end plate and a rotating seat fixed to the bottom of the lower cylindrical silo. A rotating sleeve capable of threadedly engaging with the docking cylinder is rotatably mounted on the rotating seat.

7. A large-diameter deep-hole rock-embedded pile according to claim 1, characterized in that: The number of main reinforcement bars is even, and each of the alternating main reinforcement bars has a sliding fit with both ends of a spiral stirrup. The middle of the spiral stirrup is fixed to another main reinforcement bar. The main reinforcement bars that slide with the spiral stirrup and the main reinforcement bars that are fixed to the spiral stirrup are in relative positions along the diameter of the distribution circle of the multiple main reinforcement bars.

8. A large-diameter deep-hole rock-embedded pile according to claim 5, characterized in that: The bottom end of the connector is movably embedded with ball bearings.

9. A large-diameter deep-hole rock-embedded pile according to claim 7, characterized in that: Both ends of the spiral stirrup are provided with sliding buckles that slide with the main reinforcement.

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