Supporting device for hoisting rotary excavating pile reinforcement cage

Abstract

The invention discloses a supporting device for hoisting a rotary excavating pile reinforcement cage. The supporting device comprises a collecting assembly, the collecting assembly comprises a barrel with an opening in the top, a guiding assembly made of rubber is installed at the top of the barrel, a supporting assembly and a traction assembly which are arranged in the guiding assembly are further installed at the top of the barrel, and the supporting assembly comprises a plurality of sets of supporting arms and a plurality of protective sleeves. The supporting arms are annularly distributed at the top of the cylinder body, the protective sleeve is connected with the guide assembly, the protective sleeve is rotationally connected with the supporting arms, and the supporting arms are rotationally connected with the cylinder body; the traction assembly pulls the protection sleeve arranged at the bottom of the reinforcement cage in a sleeving mode to support and protect the bottom of a reinforcement, the bottom of the reinforcement cage is covered and protected through the guide assembly, muck falling off from the inner wall of a pile hole through scraping of the reinforcement cage is guided by the guide assembly to fall into the cylinder, and the muck falling off through scraping is collected through the cylinder. Therefore, muck is prevented from forming a thick sediment layer at the hole bottom, and the bearing capacity and stability of a pile foundation are guaranteed.

Description

Technical Field

[0001] The invention relates to the field of foundation pit reinforcement cage support, and in particular to a support device for hoisting a rotary drilling pile reinforcement cage. Background Art

[0002] A rotary-drilled pile foundation pit is a foundation pit project that uses rotary-drilled cast-in-place piles as the primary support structure. This is a common form of foundation pit support in building foundation construction. Its core approach involves using a rotary drill to create a hole, placing a steel cage inside the pile hole, and then pouring concrete to form the supporting piles.

[0003] At present, the steel cage is hoisted into the pile hole using a two-point hoisting installation method. Since the steel bars at the lower end of the steel cage are directly exposed, the position of the steel cage needs to be repeatedly adjusted when the steel cage is hoisted into the pile hole to ensure that all the steel bars can be inserted into the pile hole. Therefore, the entire hoisting process into the hole consumes a lot of time. At the same time, after being inserted into the hole, the steel cage will scratch the inner wall of the pile hole when it is lowered, causing a large amount of debris to fall off. Excessive debris forms a thick sediment layer at the bottom of the hole. The thick sediment layer will significantly reduce the bearing capacity of the pile end, thereby directly affecting the stability and bearing capacity of the pile foundation. Summary of the Invention

[0004] The purpose of the present invention is to propose a support device for lifting the steel cage of a rotary bored pile in order to solve the problem that when the steel cage is hoisted in the pile hole, the position of the steel cage needs to be repeatedly adjusted, and the steel cage scrapes against the inner wall of the pile hole when lowered, causing a large amount of debris to fall off at the bottom of the hole to form a thick sediment layer.

[0005] In order to achieve the above-mentioned object, the present invention provides a support device for lifting a steel cage of a rotary drilling pile, the support device comprising a collecting assembly, a guiding assembly, a supporting assembly and a traction assembly, the collecting assembly comprising a cylinder with an open top, a guiding assembly made of rubber installed on the top of the cylinder, the supporting assembly and the traction assembly being installed in the guiding assembly and located at the top of the cylinder; the supporting assembly comprises a plurality of groups of support arms and a plurality of protective sleeves, the plurality of groups of support arms being annularly distributed on the top of the cylinder, the protective sleeves being connected to the guide assembly, the protective sleeves being rotatably connected to the support arms, the support arms being rotatably connected to the cylinder, and elastic components being provided at the connection parts between the support arms, the protective sleeves and the cylinder; the guide assembly shrinks or expands under the action of the support assembly, the inner diameter of the guide assembly in the expanded state is larger than the outer diameter of the steel cage, and the outer diameter matches the inner diameter of the pile hole, and the outer diameter of the guide assembly in the contracted state is smaller than the inner diameter of the steel cage; the outer diameter of the cylinder is smaller than the inner diameter of the steel cage, and the traction assembly is located in the cylinder and is used for traction of the cylinder; When the steel cage is hoisted, the guide assembly is stretched and sleeved on the bottom of the steel cage, and the steel bars at the bottom of the steel cage are inserted into the protective sleeve. The cylinder is pulled upward by the traction assembly, so that the guide assembly protects the bottom of the steel cage during the hoisting process, and the debris that falls off the inner wall of the pile hole due to the scratches of the steel cage falls into the cylinder under the guidance of the guide assembly; and after loosening the traction assembly, the cylinder drives the guide assembly to separate from the steel cage under the gravity of itself and the debris, and the rebound of the elastic member makes the support arm and the protective sleeve move closer to the traction assembly, causing the guide assembly to shrink.

[0006] A better technical solution of the present invention: a first guide rail is coaxially fixed to the top of the cylinder, the traction assembly includes a traction rod, and a second guide rail coaxially arranged with the first guide rail is fixed to the lower end of the traction rod, and the first guide rail and the second guide rail are connected by connecting arms with sliding grooves at both ends; the number of the connecting arms matches the support arms, and the lower end axis of each support arm is rotatably connected to the connecting arm; the spacing between adjacent protective sleeves is adjusted by sliding the sliding groove and the first guide rail and the second guide rail.

[0007] A preferred technical solution of the present invention is as follows: the guide assembly includes a rubber cover that is detachable from the top of the cylinder, and the rubber cover is detachable from the protective sleeve.

[0008] A preferred technical solution of the present invention is that the bottom of the cylinder is an open structure, and a bottom cover is hingedly connected to the bottom of the cylinder.

[0009] A better technical solution of the present invention: the end of the connecting arm away from the traction rod and the lower end of the protective sleeve are both fixed with a connecting seat with an axis rod; one end of the support arm is rotatably connected to the connecting seat axis of the end of the connecting arm away from the traction rod, and the other end is rotatably connected to the connecting seat axis at the lower end of the protective sleeve, and a coil spring is fixed between the axis rod of each connecting seat and the support arm.

[0010] A more preferred technical solution of the present invention is that a counterweight block is movably mounted on the upper end of the traction rod, and a lifting ring is fixed on the upper end of the counterweight block.

[0011] A preferred technical solution of the present invention is as follows: a card slot is vertically provided on the side wall of the protective sleeve, and a plurality of card blocks adapted to the card slot are fixed on the inner wall of the rubber cover.

[0012] A preferred technical solution of the present invention is that a rubber bucket is integrally formed on the top of the rubber cover, and the rubber bucket is an inverted frustum-shaped structure.

[0013] A more preferred technical solution of the present invention is as follows: a movable hole larger than the outer diameter of the traction rod is opened in the counterweight block, and a limiting plate adapted to the movable hole is fixed to the upper end of the traction rod.

[0014] A preferred technical solution of the present invention is that a plurality of pressure relief holes connected to the movable hole are provided on the limit plate and the counterweight block.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The present invention forms an inverted frustum-shaped structure through multiple annularly distributed protective sleeves and inclined support arms. The frustum structure is used to guide the lower end of the steel cage to be quickly inserted into the pile hole. At the same time, the bottom of the steel cage is also protected by a guide component to prevent the steel bars at the lower end of the steel cage from directly poking the inner wall of the pile hole, thereby reducing the scratches of the steel cage on the inner wall of the pile hole. Moreover, the debris that falls off the inner wall of the pile hole due to the scratches of the steel cage falls into the cylinder through the guidance of the guide component, so that the debris that falls off can be collected by the cylinder, thereby avoiding the formation of a thick sediment layer at the bottom of the hole, thereby ensuring the bearing capacity and stability of the pile foundation.

[0016] 2. The present invention uses a traction assembly to pull the support assembly, so that the protective sleeve is installed on the bottom steel bars of the steel cage to form a bottom support point. Combined with the traditional lifting points, it forms a "three-point lifting" structure, which significantly enhances the lifting stability of the steel cage and prevents shaking and deviation. At the same time, it disperses the load of the stirrups and avoids the steel cage falling accident caused by the breakage of the weld.

[0017] 3. The present invention adjusts the outer diameters of multiple annularly distributed protective sleeves through the rotation of the support arm, thereby making it suitable for steel cages with different outer diameters. By rotating and adjusting around the traction rod through the cooperation of the connecting arm and the guide rail, the spacing of the protective sleeves can be adjusted according to the number of steel bars, so that the protective sleeves can support the steel bars at the bottom of the steel cage at intervals, thereby adapting to the use of different numbers of steel bars.

[0018] 4. The upper guide assembly of the present invention is made of rubber material and is supported by an internal support assembly. During the hoisting process of the steel cage, the guide assembly is fully opened and sleeved on the bottom of the steel cage, which can guide, support and protect the hoisting of the steel cage. When the steel cage is hoisted to a certain distance from the bottom of the hole, the cylinder can be controlled to drive the guide assembly to separate from the steel cage, and the guide assembly can be folded up so that its diameter is smaller than the diameter of the steel cage. In addition, the diameter of the cylinder is also smaller than that of the steel cage, so the entire device can be lifted back to the ground through the hollow area in the middle of the steel cage, and the collected debris can be removed and reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 A in the middle is an enlarged structural diagram; Figure 3 This is a schematic diagram of the cross-section structure of the cylinder and the guide assembly of the present invention; Figure 4 For the present invention Figure 3 The enlarged structural diagram at B in the middle; Figure 5 This is a schematic diagram of the traction rod structure of the present invention; Figure 6 This is a schematic diagram of the partial structure of the traction assembly of the present invention; Figure 7 This is a schematic structural diagram of the guide assembly of the present invention; Figure 8 This is a schematic structural diagram of the support assembly of the present invention; Figure 9 This is a schematic diagram of the structure of the present invention as a whole and the steel cage in an installed state; Figure 10 It is a schematic diagram of the structure of the present invention when the pile is lowered into the hole.

[0020] Legend: 10. Collection assembly; 11. Cylinder; 12. Bottom cover; 13. First guide rail; 20. Guide assembly; 21. Rubber cover; 22. Rubber bucket; 23. Block; 30. Support assembly; 31. Protective sleeve; 311. Slot; 32. Connecting arm; 321. Slide; 33. Support arm; 34. Connecting seat; 35. Coil spring; 36. Protective shell; 40. Traction assembly; 41. Traction rod; 411. Second guide rail; 42. Limit plate; 43. Pressure relief hole; 44. Counterweight; 441. Movable hole; 442. Lifting ring; 45. Steel cable; 50. Steel cage; 51. Steel bar; 60. Pile hole. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] The embodiment provides a support device for hoisting a steel cage of a rotary drilling pile, such as Figure 1 - Figure 10As shown, the support device includes a collecting assembly 10, a guiding assembly 20, a supporting assembly 30 and a pulling assembly 40; the collecting assembly 10 includes a cylinder 11 with an opening at the top, and the outer diameter of the cylinder 11 is smaller than the inner diameter of the steel cage 50, the guiding assembly 20 is installed on the top of the cylinder 11, and the guiding assembly 20 is made of rubber, and its inner diameter in the open state is larger than the outer diameter of the steel cage 50, and the outer diameter matches the inner diameter of the pile hole 60; the supporting assembly 30 and the pulling assembly 40 are both arranged in the guiding assembly 20, and are both located at the top of the cylinder 11. The support assembly 30 is used to prop up the guide assembly 20. The support assembly 30 includes multiple groups of support arms 33 and multiple protective sleeves 31. The protective sleeves 31 are used to be inserted into the steel bars 51 at the bottom of the steel cage 50; multiple connecting arms 32 are distributed in a ring shape on the top surface of the cylinder, and multiple groups of support arms 33 are distributed in a ring shape in the guide assembly 20 above the cylinder 11. The protective sleeves 31 are located on the top of the support arms 33 and are connected to the guide assembly 20. One end of the support arm 33 is rotatably connected to the cylinder 11, and the other end is rotatably connected to the protective sleeves 31.

[0023] When the protective sleeve 31 moves closer to the traction assembly 40, the rubber guide assembly 20 is driven to contract. Therefore, by rotating and adjusting the support arm 33, the guide assembly 20 can be opened so that its diameter is larger than the steel cage 50 and can be mounted on the bottom of the steel cage 50. The guide assembly 20 can also be retracted so that its overall diameter is smaller than the inner diameter of the steel cage 50. The outer diameters of multiple annularly distributed protective sleeves 31 can also be adjusted by rotating and adjusting the support arm 33, so that they are suitable for steel cages with different outer diameters.

[0024] like Figures 1 to 3 As shown, the traction assembly 40 is located at the center of the cylinder 1 and is connected to multiple connecting arms 32. The steel cable 45 on the top of the traction assembly 40 pulls the protective sleeve 31 on the bottom of the steel cage to support and protect the bottom of the steel bar. Multiple annularly distributed protective sleeves 31 and inclined support arms 33 form an inverted frustum-shaped structure. The frustum structure is used to guide the lower end of the steel cage to be quickly inserted into the pile hole. At the same time, the bottom of the steel cage is also protected by the guide assembly 20 to prevent the steel bars at the lower end of the steel cage from directly poking the inner wall of the pile hole.

[0025] At the same time, during the hoisting process, after the steel cable 45 is connected to the hook of the crane and tightened, the upward traction of the traction component 40 makes the guide component 20 always have an upward pulling force, which is sleeved on the bottom of the steel cage 50 and, with the cooperation of the support component 30, can support the bottom of the steel cage. In this way, in combination with the traditional two-point hoisting, a three-point hoisting method is formed with two points plus bottom support, which makes the steel cage more stable during hoisting, and at the same time reduces the load on the stirrups during two-point hoisting, avoiding the problem of the stirrups breaking and falling from the welding points during hoisting due to overload; after the steel cage is hoisted into the pile hole, the debris that falls off the inner wall of the pile hole after being scratched by the steel cage falls into the cylinder 11 through the guidance of the guide component 20, so that the debris that falls off can be collected by the cylinder 11, thereby avoiding the formation of a thick sediment layer at the bottom of the hole, thereby ensuring the bearing capacity and stability of the pile foundation.

[0026] After loosening the traction assembly 40 (that is, loosening the steel cable 45), the cylinder 11 and the guide assembly 20 lose the upward pulling force. At this time, under the combined gravity of the cylinder 11's own gravity and the collected debris inside it, the cylinder 11 drives the guide assembly 20 and the protective sleeve 31 to move downward. During the movement, the protective sleeve 31 is separated from the steel bar 51, and the rebound of the elastic member causes the support arm 33 and the protective sleeve 31 to move closer to the traction assembly 40. The protective sleeve 31 also drives the rubber guide assembly 20 to shrink. At this time, the diameter of the entire device is smaller than the inner diameter of the steel cage 50, and the cylinder 11 can be lifted from the hollow area of ​​the steel cage 50 to the outside of the pile hole 60 through the steel cable 45.

[0027] It is worth noting that in order to facilitate the adjustment of the tightness of the steel cable 45, a tensioner is connected between the upper end of the steel cable 45 and the hook, so that the pulling strength of the steel cable 45 can be adjusted by adjusting the tensioner.

[0028] like Figure 3 、 Figure 4 、 Figure 5 、 Figure 8 As shown, in the embodiment, an annular first guide rail 13 is coaxially fixed to the top of the cylinder 11, and the traction assembly 40 includes a traction rod 41, and the lower end of the traction rod 41 is fixed with an annular second guide rail 411 coaxially arranged with the first guide rail 13, and the two ends of each connecting arm 32 are respectively provided with a slide groove 321 matching the first guide rail 13 and the second guide rail 411, and one end of each connecting arm 32 is slidably connected to the first guide rail 13 through the slide groove 321, and the other end is slidably connected to the second guide rail 411 through the slide groove 321.

[0029] The spacing between adjacent protective sleeves 31 is adjusted by sliding the slide groove 321 with the first guide rail 13 and the second guide rail 411. Therefore, the spacing of the protective sleeves 31 is adjusted according to the number of vertical steel bars in different steel cages. When the number of protective sleeves 31 is less than the number of steel bars, the connecting arm 32 slides with the first guide rail 13 and the second guide rail 411 through the slide grooves 321 at both ends and rotates around the traction rod 41 to adjust the spacing of the protective sleeves 31. In this way, the spacing of the protective sleeves 31 can be adjusted according to the number of steel bars, so that the protective sleeves 31 support the steel bars at the bottom of the steel cage at intervals, thereby adapting to the use of different numbers of steel bars; at the same time, the steel bars that are not covered by the protective sleeves 31 are still covered in the guide assembly 20 to protect the exposed lower ends of the steel bars through the guide assembly 20.

[0030] like Figure 3 、 Figure 8 As shown in the embodiment, the end of the connecting arm 32 away from the traction rod 41 and the lower end of the protective sleeve 31 are fixed with a connecting seat 34 with a shaft; the two ends of the support arm 33 are respectively axially connected to the connecting arm 32 and the connecting seat 34 of the protective sleeve 31, and a coil spring 35 is fixed between the shaft of the connecting seat 34 and the support arm 33. The inner end of the coil spring 35 is fixed on the shaft, and the outer end is fixed on the support arm 33. Therefore, when the support arm 33 and the protective sleeve 31 rotate clockwise around the shaft When the needle rotates, the coil spring 35 is wound and stores force, and when the protective sleeve 31 is separated from the lower end of the steel bar, the rebound force of the coil spring 35 causes the protective sleeve 31 and the support arm 33 to flip counterclockwise around the shaft and move closer to the traction rod 41 to accommodate the protective sleeve 31 and the support arm 33, making it easier to lift the cylinder 11 out of the steel cage; and in order to prevent the slag from getting stuck in the coil spring 35, a protective shell 36 (such as a protective shell 36) covering the coil spring 35 is fixed on the support arm 33. Figure 3 shown).

[0031] In the embodiment, Figure 3 、 Figure 5 、 Figure 6 As shown, a vertically movable counterweight 44 is installed at the upper end of the traction rod 41, a lifting ring 442 is fixed to the upper end of the counterweight 44, and a steel cable 45 is fixed to the lifting ring 442. When the protective sleeve 31 is stuck on the steel bar, the counterweight 44 is lifted up and then lowered. At this time, the protective sleeve 31 can be conveniently removed from the steel bar by relying on the inertia force of the counterweight 44.

[0032] In the embodiment, Figure 3 、 Figure 5 、 Figure 6As shown, the counterweight block 44 is provided with a movable hole 441 which is larger than the outer diameter of the traction rod 41. The traction rod 41 is inserted into the movable hole 441 from the bottom of the counterweight block 44. A limit plate 42 which is adapted to the movable hole 441 is fixed to the upper end of the traction rod 41. The counterweight block 44 is a two-half structure to facilitate the installation of the limit plate 42 into the movable hole 441. Figure 5 、 Figure 6 As shown, multiple pressure relief holes 43 connected to the movable hole 441 are opened on the limit plate 42 and the counterweight block 44. When the counterweight block 44 is lifted and falls, the pressure in the movable hole 441 is relieved through the pressure relief holes 43 to reduce the pressure in the movable hole 441, so that the counterweight block 44 can better impact the traction rod 41 downward.

[0033] In the embodiment, Figure 3 、 Figure 7 As shown, the guide assembly 20 includes a rubber cover 21 that is detachable from the top of the cylinder 11, and flanges are fixed to the top of the cylinder 11 and the bottom of the rubber cover 21 to facilitate the disassembly and assembly of the cylinder 11 and the rubber cover 21. At the same time, the rubber cover 21 and the protective sleeve 31 are detachable. Therefore, by disassembling and assembling the guide assembly 20, the guide assembly 20 can be replaced according to pile holes of different diameters, thereby ensuring that the guide assembly 20 fully fits the pile hole. Figure 7 and Figure 10 As shown, the rubber bucket 22 is integrally formed on the top of the rubber cover 21. The rubber bucket 22 is an inverted cone-shaped structure. Therefore, when the rubber cover 21 is lowered into the pile hole, the upper edge of the rubber bucket 22 is turned outward to ensure that it fits fully with the pile hole, thereby improving the collection effect of scraped and fallen debris.

[0034] like Figure 2 、 Figure 7 、 Figure 8 As shown, a plurality of blocks 23 adapted to the slots 311 are fixed to the inner wall of the rubber cover 21 through a slot 311 vertically opened on the side wall of the protective sleeve 31. The cross-section of the block 23 is a T-shaped structure. The block 23 is vertically slid into the slot 311 to facilitate quick disassembly and assembly of the protective sleeve 31 and the rubber cover 21.

[0035] like Figure 9 、 Figure 10 As shown, the bottom of the cylinder 11 is an open structure, and a bottom cover 12 is hinged to one side of the bottom of the cylinder 11 through a hinge. The bottom of the cylinder 11 and the side of the bottom cover 12 away from the hinge are connected by multiple buckles to facilitate the discharge of the debris collected in the cylinder 11 by opening the bottom cover 12.

[0036] The working process of the present invention is as follows: Figure 9 and Figure 10As shown, the expected matching rubber cover 21 and rubber bucket 22 are selected according to the diameter of the pile hole 60, and the two flanges are connected by the combination of bolts and nuts; then, the connecting arm 32 is rotated and adjusted according to the number of steel bars in the steel cage 50, so that multiple protective sleeves 31 are evenly distributed at the bottom of the steel cage 50, and then the clamping block 23 is clamped into the clamping groove 311 of the corresponding protective sleeve 31 to complete the connection between the rubber cover 21 and the protective sleeve 31, and then the support arm 33 and the protective sleeve 31 are flipped outward to allow the coil spring 35 to elastically store force, and the steel cable 45 is pulled to insert the protective sleeve 31 into the corresponding steel bar 51.

[0037] Hang the upper end of the tensioner on the hook and rotate the tensioner to shrink it. Pull the lifting ring 442 and the traction rod 41 through the steel cable 45. The traction rod 41 pulls the cylinder 11, the connecting arm 32 and the support arm 33. At this time, under the pulling force, the protective sleeve 31 is firmly fixed to the lower end of the steel bar; lift the steel cage 50 through the crane and put it into the pile hole. The scraped and fallen debris falls into the cylinder 11 under the guidance of the rubber bucket 22 and the rubber cover 21, and after reaching the preset depth (that is, the depth that can ensure that the cylinder 11 continues to descend and the guide assembly 20 is completely separated from the steel cage 50, and the protective sleeve 31 is separated from the lower end of the steel bar), loosen the tensioner. The cylinder 11 that has separated from the steel cage 50 continues to move downward by relying on its own gravity and the gravity of the internal debris, and the protective sleeve 31 is completely separated from the steel bar. At this time, the guide assembly 20 has separated from the steel cage and has no supporting force. The coil spring 35 rebounds, causing the support arm 33 and the protective sleeve 31 to move closer to the traction rod 41. At the same time, the protective sleeve 31 drives the rubber cover 21 and the rubber bucket 22 to shrink and become smaller than the inner diameter of the steel cage; the steel cage 50 continues to be lowered to the bottom of the hole. When the steel cage 50 continues to be lowered, the cylinder 11 and the guide assembly 20 are both located in the internal hollow area of ​​the steel cage 50, which will not affect the continued descent of the steel cage 50. When the steel cage 50 descends to the bottom of the pile hole 60, the lifting rope is removed from the stirrups; at this time, the cylinder 11 for collecting the debris can be lifted upward from the hollow area of ​​the steel cage 50 to above the hole mouth of the pile hole 60 through the cooperation of the steel cable 45 and the crane, and the cylinder 11 is moved to the debris stacking area, the bottom cover 12 at the bottom of the cylinder 11 is opened, and the debris in the cylinder 11 is cleaned.

[0038] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A support device for hoisting a steel cage of a rotary bored pile, characterized by: The support device comprises a collecting assembly (10), a guiding assembly (20), a supporting assembly (30) and a pulling assembly (40), wherein the collecting assembly (10) comprises a cylinder (11) with an open top, a guiding assembly (20) made of rubber is installed on the top of the cylinder (11), and the supporting assembly (30) and the pulling assembly (40) are installed in the guiding assembly (20) and are located on the top of the cylinder (11); the supporting assembly (30) comprises a plurality of supporting arms (33) and a plurality of protective sleeves (31), wherein the plurality of supporting arms (33) are distributed in an annular manner on the top of the cylinder (11), the protective sleeves (31) are connected to the guiding assembly (20), and the protective sleeves (31) are connected to the guiding assembly (20). ) is rotatably connected to the support arm (33), the support arm (33) is rotatably connected to the cylinder (11), and an elastic component is provided at the connection portion between the support arm (33), the protective sleeve (31) and the cylinder (11); the guide assembly (20) contracts or expands under the action of the support assembly (30); the inner diameter of the guide assembly (20) in the expanded state is larger than the outer diameter of the steel cage (50), and the outer diameter matches the inner diameter of the pile hole (60); the outer diameter of the guide assembly (20) in the contracted state is smaller than the inner diameter of the steel cage (50); the outer diameter of the cylinder (11) is smaller than the inner diameter of the steel cage (50), and the traction assembly (40) is located in the cylinder (11) and is used to traction the cylinder (11); When the steel cage (50) is hoisted, the guide assembly (20) is stretched and sleeved on the bottom of the steel cage (50), and the steel bars at the bottom of the steel cage (50) are inserted into the protective sleeve (31). The cylinder (11) is pulled upward by the traction assembly (40), so that the guide assembly (20) protects the bottom of the steel cage (50) during the hoisting process, and the debris that falls off the inner wall of the pile hole due to the scratching of the steel cage falls into the cylinder (11) through the guidance of the guide assembly (20); and after the traction assembly (40) is loosened, the cylinder (11) drives the guide assembly (20) to separate from the steel cage (50) under the gravity of itself and the debris, and the rebound of the elastic member causes the support arm (33) and the protective sleeve (31) to move closer to the traction assembly (40), so that the guide assembly (20) contracts.

2. A supporting device for hoisting a steel cage of a rotary bored pile according to claim 1, characterized in that: A first guide rail (13) is coaxially fixed to the top of the cylinder (11), and the traction assembly (40) includes a traction rod (41), and a second guide rail (411) coaxially arranged with the first guide rail (13) is fixed to the lower end of the traction rod (41), and the first guide rail (13) and the second guide rail (411) are connected through a connecting arm (32) with a slide groove (321) at both ends; the number of the connecting arms (32) matches the support arm (33), and the lower end of each support arm (33) is rotatably connected to the connecting arm (32); the spacing between two adjacent protective sleeves (31) is adjusted by sliding the slide groove (321) and the first guide rail (13) and the second guide rail (411).

3. A supporting device for hoisting a steel cage of a rotary bored pile according to claim 1 or 2, characterized in that The guide assembly (20) includes a rubber cover (21) that is detachable from the top of the cylinder (11), and the rubber cover (21) and the protective sleeve (31) are detachable.

4. A supporting device for hoisting a steel cage of a rotary bored pile according to claim 1 or 2, characterized in that: The bottom of the cylinder (11) is an open structure, and a bottom cover (12) is hinged to the bottom of the cylinder (11).

5. The supporting device for hoisting a steel cage of a rotary bored pile according to claim 2, characterized in that: The end of the connecting arm (32) away from the traction rod (41) and the lower end of the protective sleeve (31) are both fixed with a connecting seat (34) with an axis rod; one end of the support arm (33) is rotatably connected to the connecting seat (34) at the end of the connecting arm (32) away from the traction rod (41), and the other end is rotatably connected to the connecting seat (34) at the lower end of the protective sleeve (31), and a coil spring (35) is fixed between the axis rod of each connecting seat (34) and the support arm (33).

6. The supporting device for hoisting a steel cage of a rotary bored pile according to claim 2, characterized in that: A counterweight (44) is movably mounted on the upper end of the traction rod (41), and a lifting ring (442) is fixed to the upper end of the counterweight (44).

7. The supporting device for hoisting a steel cage of a rotary bored pile according to claim 3, characterized in that: A clamping slot (311) is vertically provided on the side wall of the protective sleeve (31), and a plurality of clamping blocks (23) adapted to the clamping slot (311) are fixed to the inner wall of the rubber cover (21).

8. The supporting device for hoisting a steel cage of a rotary bored pile according to claim 3, characterized in that: A rubber bucket (22) is integrally formed on the top of the rubber cover (21), and the rubber bucket (22) is an inverted frustum-shaped structure.

9. The supporting device for hoisting a steel cage of a rotary bored pile according to claim 6, characterized in that: A movable hole (441) having a diameter larger than the outer diameter of the traction rod (41) is provided in the counterweight block (44), and a limiting plate (42) adapted to the movable hole (441) is fixed to the upper end of the traction rod (41).

10. The supporting device for hoisting a steel cage of a rotary bored pile according to claim 7, characterized in that: The limiting plate (42) and the counterweight block (44) are both provided with a plurality of pressure relief holes (43) that are in communication with the movable hole (441).

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