Cast-in-situ bored pile steel casing construction device and construction method

Abstract

The invention relates to the field of cast-in-situ bored pile construction. The invention discloses a cast-in-situ bored pile steel casing construction device and a construction method and aims to solve the problem that the top of a steel casing is pressed downwards through a pile driver, then the whole steel casing is inserted into soil at a time, and the perpendicularity of the steel casing inserted into the soil is difficult to guarantee. The device is composed of a tubular locking and pressing mechanism and a supporting and limiting mechanism. According to the cast-in-situ bored pile steel casing construction device and construction method, one end of a hydraulic cylinder extends into a steel casing through a pile driver, and the hydraulic cylinder extends to drive a three-folded plate on the hydraulic cylinder to abut against a convex block and deflect, so that a vertical plate on the three-folded plate abuts against the inner wall of the steel casing; and then the steel casing is driven by a pile driver to move to a designated position, and the lower end of the steel casing is inserted into a designated area, so that the steel casing is pre-fixed, the perpendicularity of the pre-fixed steel casing is conveniently detected, and the perpendicularity of the steel casing inserted into soil by a subsequent device is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of bored cast-in-place pile construction, and particularly to a construction device and construction method for steel casing of bored cast-in-place piles. Background Technique

[0002] A bored cast-in-place pile refers to a pile formed by means of mechanical drilling, steel pipe soil extrusion or manual excavation at the construction site to form a pile hole in the foundation soil, and placing a steel reinforcement cage and pouring concrete therein. When constructing bridge pile foundations, it is necessary to excavate pile holes. To prevent hole collapse and avoid affecting the construction progress and safety accidents, steel casings are often used to protect the pile holes.

[0003] When the existing construction device for the steel casing of bored cast-in-place piles inserts the steel casing into the soil, most of them press the top of the steel casing by a pile driver, and then insert the entire steel casing into the soil at one time. It is difficult to ensure the verticality of the steel casing inserted into the soil. However, due to the certain length of the steel casing itself, when the pile driver inserts the steel casing into the soil at one time, the overall stress on the steel casing is too large, resulting in deformation of the steel casing when it is inserted into the soil, affecting the quality of the subsequent use of the steel casing. Summary of the Invention

[0004] The purpose of the present invention is to provide a construction device and construction method for the steel casing of bored cast-in-place piles to solve the problems proposed in the above background technique that by pressing the top of the steel casing by a pile driver and then inserting the entire steel casing into the soil at one time, it is difficult to ensure the verticality of the steel casing inserted into the soil. However, due to the certain length of the steel casing itself, when the pile driver inserts the steel casing into the soil at one time, the overall stress on the steel casing is too large, resulting in deformation of the steel casing when it is inserted into the soil, affecting the quality of the subsequent use of the steel casing. To achieve the above purpose, the present invention provides the following technical solution: A construction device for the steel casing of bored cast-in-place piles, including a fixed rod, a pressure plate is installed at the lower end of the fixed rod, a support frame is installed directly below the pressure plate, and a tubular locking and pressing mechanism is fixedly connected to the lower end of the support frame. The steel casing is locked and pushed downward during the pressing process of the tubular locking and pressing mechanism to drive the steel casing into the soil; A resistance disk is arranged at the lower end of the tubular locking and pressing mechanism, and a support and limiting mechanism is arranged on the outer side of the resistance disk and is installed on the support frame.

[0005] Preferably, the tubular locking and pressing mechanism includes a hydraulic cylinder fixed directly below the support frame, a limit sleeve is installed on the hydraulic cylinder, and a convex block is fixedly connected to the through groove on the surface of the limit sleeve; Four three-fold plates are hinged to the inner rod of the hydraulic cylinder, and the four three-fold plates are evenly distributed in a ring shape. The three-fold plates are slidably arranged in the through groove of the limit sleeve.

[0006] Preferably, the tubular locking and pressing mechanism further includes a spring telescopic tube fixed to the end of the support frame. Sixteen parallel bars are hinged to the inner wall of the inner tube of the spring telescopic tube, and the sixteen parallel bars are grouped into four groups, and the four parallel bars in each group are distributed in a rectangular shape. First spring telescopic rods are hinged between the eight parallel bars on the lower side and the inner tube of the spring telescopic tube; One end of the four parallel bars in each group away from the inner tube of the spring telescopic tube is hinged with an arc-shaped clamping plate. A one-way bearing is installed on the arc-shaped clamping plate. The lower end of the arc-shaped clamping plate is fixedly connected with a pressing block, and the pressing block abuts against the resistance disk at the lower end of the inner tube of the spring telescopic tube.

[0007] Preferably, the support and limit mechanism includes arc-shaped telescopic plates fixed to both ends of the support frame. A chute is opened on the outer tube of the arc-shaped telescopic plate. A sliding plate is slidably connected in the chute, and two inclined surfaces are opened at one end of the sliding plate located inside the arc-shaped telescopic plate. A damping spring telescopic rod is fixedly connected between the sliding plate and the bottom plate of the arc-shaped telescopic plate; An L-shaped clamping block is inserted through the outer tube of the arc-shaped telescopic plate. One end of the L-shaped clamping block extends into the chute and is inserted into a wedge-shaped groove opened on the sliding plate. The lower end of the L-shaped clamping block is fixedly connected with a second spring telescopic rod, and the end of the second spring telescopic rod away from the L-shaped clamping block is fixed on the arc-shaped telescopic plate.

[0008] Preferably, a groove is opened at the bottom end of the resistance disk. The inner wall of the groove fits with one end of the sliding plate. A wedge-shaped block is inserted through the resistance disk. The inclined surface at the end of the wedge-shaped block abuts against the inclined surface. A reset spring telescopic rod is installed on the wedge-shaped block. One end of the reset spring telescopic rod is fixed on the resistance disk. A third spring telescopic rod is fixedly connected to the side surface of the wedge-shaped block. Two cut surfaces are opened at the end of the third spring telescopic rod away from the wedge-shaped block, and the end of the third spring telescopic rod with an inclined surface is lapped on the inner side of the L-shaped clamping block.

[0009] Preferably, the three-fold plate is formed by hinging two parallel plates and a vertical plate.

[0010] Preferably, an anti-slip ring is provided on the outer ring of the one-way bearing.

[0011] Preferably, the construction method of the bored cast-in-place pile steel casing construction device includes the following steps: S1: Connect the upper end of the fixed rod to the head of the pile driver. Then, extend one end of the hydraulic cylinder into the steel casing through the pile driver. Drive the three-fold plate on it to abut against the convex block and deflect by the elongation of the hydraulic cylinder, so that the vertical plate on the three-fold plate abuts against the inner wall of the steel casing. Then, drive the steel casing to move to the designated position through the pile driver and insert its lower end into the designated area; Then, the contraction of the hydraulic cylinder drives the vertical plate of the triple-fold plate to separate from the inner wall of the steel casing. At this time, the pile driver drives the pressure plate and the support frame to move downward, causing the spring telescopic tube to contract and cooperate with the parallel rod to drive the pressing block to abut against the upper side of the resistance plate. At this time, the parallel rod deflects to drive the four arc-shaped clamping plates to move towards the central axis of the spring telescopic tube, and then abut against the outer side of the steel casing and fix it. Then, the pile driver continues to push the spring telescopic tube downward. At this time, the spring telescopic tube has contracted to the shortest value, and the lower end of the spring telescopic tube pushes the resistance plate downward, causing the inclined plane provided on the sliding plate inside the resistance plate to squeeze the wedge block to move. The cooperation of the wedge block and the third spring telescopic rod moves to drive the L-shaped clamping block stuck on the sliding plate to move and separate from it, unlocking the locking state of the L-shaped clamping block on the sliding plate; S2: At this time, the resistance plate continues to move downward under the thrust of the pile driver, causing the tangent plane on the lower side of the end of the third spring telescopic rod to abut against the inner side of the L-shaped clamping block, pushing the third spring telescopic rod to contract to ensure the stable downward movement of the resistance plate. At this time, the steel casing continues to penetrate into the soil under the action of the clamping force of the four arc-shaped clamping plates and the one-way bearing inside it. When the resistance plate moves downward, it pushes the damping spring telescopic rod to compress. When the damping spring telescopic rod contracts to the shortest value, the pile driver starts to drive the fixed rod to move upward. At this time, the outer ring of the one-way bearing rolls on the outer side of the steel casing, reducing the friction between the one-way bearing and the outer wall of the steel casing; S3: And when the pile driver drives the fixed rod to move upward, the damping spring telescopic rod has a damping force during elongation. Therefore, when the pile driver drives the fixed rod to move upward, the lower end of the resistance plate separates from the sliding plate. At this time, the resistance plate separates from the bottom surface of the pressing block under the action of the restoring force of the spring telescopic tube. And at this time, the parallel rod drives the pressing block to separate from the outer wall of the steel casing under the action of the pulling force of the first spring telescopic rod, that is, unlocking the locking state of the arc-shaped clamping plate on the steel casing. And during the upward movement of the resistance plate, the tangent plane on the upper side of the end of the third spring telescopic rod abuts against the lower side of the L-shaped clamping block. After assisting in pulling the damping spring telescopic rod to reset, the L-shaped clamping block cannot continue to move upward. At this time, the tangent plane on the lower side of the third spring telescopic rod abuts against the lower side of the L-shaped clamping block and contracts under force, and moves to the upper side of the L-shaped clamping block, that is, completing the reset of the device. Then, the pile driver drives the fixed rod to move downward again to realize the penetration of the steel casing into the soil. Repeat this process to insert the steel casing into the specified soil.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: In the present invention, one end of the hydraulic cylinder is extended into the steel casing by the pile driver. The elongation of the hydraulic cylinder drives the triple-fold plate on it to abut against the convex block and deflect, causing the vertical plate on the triple-fold plate to abut against the inner wall of the steel casing. Then, the pile driver drives the steel casing to move to the specified position and insert its lower end into the specified area to realize the pre-fixation of the steel casing, which is convenient for detecting the verticality of the pre-fixed steel casing and ensuring the verticality of the steel casing inserted into the soil by the subsequent device.

[0013] In the present invention, the pile driver drives the pressure plate and the support frame to move downward, causing the parallel rod to deflect and drive the four arc-shaped clamping plates to move towards the central axis of the spring telescopic tube, and then abut against the outer side of the steel casing and fix it. Then, the pile driver moves downward to insert the steel casing further into the soil. Then, the pile driver moves upward to unlock the clamping of the four arc-shaped clamping plates on the steel casing. The pile driver reciprocates and intermittently drives the steel casing into the soil, avoiding excessive stress on the steel casing caused by the device inserting the steel casing completely into the soil at one time, which may deform the steel casing and affect its subsequent use.

[0014] In the present invention, when the pile driver moves downward to insert the steel casing further into the soil, since the four arc-shaped clamping plates are clamped on the middle part of the outer side of the steel casing, the stress on the overall steel casing during the insertion of the steel casing into the soil by the pile driver is reduced, and the practicability is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional structural schematic diagram of the present invention; Figure 2 is a partial three-dimensional structural schematic diagram of the present invention; Figure 3 is a partial three-dimensional structural sectional view of the present invention; Figure 4 is a partial three-dimensional unfolded structural sectional view of the present invention; Figure 5 is one of the three-dimensional unfolded structural schematic diagrams of the resistance plate of the present invention; Figure 6 is the other three-dimensional unfolded structural schematic diagram of the resistance plate of the present invention; Figure 7 is a three-dimensional structural sectional view of the arc-shaped telescopic plate of the present invention.

[0016] In the figure: 1, fixed rod; 2, pressure plate; 3, support frame; 4, tubular locking and pressing mechanism; 41, hydraulic cylinder; 42, limit sleeve; 43, convex block; 44, three-fold plate; 45, spring telescopic tube; 46, parallel rod; 47, arc-shaped clamping plate; 48, one-way bearing; 49, pressing block; 410, first spring telescopic rod; 5, resistance plate; 51, groove; 52, wedge-shaped block; 53, reset spring telescopic rod; 54, third spring telescopic rod; 6, support and limit mechanism; 61, arc-shaped telescopic plate; 62, chute; 63, sliding plate; 64, damping spring telescopic rod; 65, L-shaped clamping block; 66, second spring telescopic rod; 67, inclined surface. DETAILED DESCRIPTION OF THE INVENTION

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figures 1 to 7 , the present invention provides a technical solution: a construction device for a steel casing of a bored cast-in-place pile, including a fixed rod 1. A pressure plate 2 is installed at the lower end of the fixed rod 1. A support frame 3 is installed directly below the pressure plate 2. A tubular locking and pressing mechanism 4 is fixedly connected to the lower end of the support frame 3. During the downward pressing process of the tubular locking and pressing mechanism 4, the steel casing is locked and pushed downward to drive the steel casing into the soil. A resistance plate 5 is provided at the lower end of the tubular locking and pressing mechanism 4. A support and limiting mechanism 6 is provided on the outer side of the resistance plate 5, and the support and limiting mechanism 6 is installed on the support frame 3.

[0019] In this embodiment, as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 shown, the tubular locking and pressing mechanism 4 includes a hydraulic cylinder 41 fixed directly below the support frame 3. A limit sleeve 42 is installed on the hydraulic cylinder 41. A convex block 43 is fixedly connected in the through groove on the surface of the limit sleeve 42. Four three-fold plates 44 are hinged on the inner rod of the hydraulic cylinder 41, and the four three-fold plates 44 are evenly distributed in a ring at equal distances. The three-fold plates 44 are slidably arranged in the through groove of the limit sleeve 42.

[0020] In this embodiment, as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 shown, the tubular locking and pressing mechanism 4 further includes a spring telescopic tube 45 fixed to the end of the support frame 3. Sixteen parallel rods 46 are hinged on the inner wall of the inner tube of the spring telescopic tube 45. The sixteen parallel rods 46 are divided into four groups, and the four parallel rods 46 in each group are arranged in a rectangle. A first spring telescopic rod 410 is hinged between the eight parallel rods 46 on the lower side and the inner tube of the spring telescopic tube 45. One end of the four parallel rods 46 in each group away from the inner tube of the spring telescopic tube 45 is hinged with an arc-shaped clamping plate 47. A one-way bearing 48 is installed on the arc-shaped clamping plate 47. A pressing block 49 is fixedly connected to the lower end of the arc-shaped clamping plate 47. The pressing block 49 abuts against the lower end of the inner tube of the spring telescopic tube 45 and the resistance plate 5.

[0021] In this embodiment, as Figure 1 、 Figure 2 、 Figure 3 、Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown in Figure 7 , the support and limit mechanism 6 includes arc-shaped telescopic plates 61 fixed to both ends of the support frame 3. A chute 62 is provided on the outer tube of the arc-shaped telescopic plate 61. A sliding plate 63 is slidably connected in the chute 62. Two inclined surfaces 67 are provided at one end of the sliding plate 63 located inside the arc-shaped telescopic plate 61. A damping spring telescopic rod 64 is fixedly connected between the sliding plate 63 and the bottom plate of the arc-shaped telescopic plate 61; An L-shaped clamping block 65 is inserted through the outer tube of the arc-shaped telescopic plate 61. One end of the L-shaped clamping block 65 extends into the chute 62 and is inserted into a wedge-shaped groove provided on the sliding plate 63. A second spring telescopic rod 66 is fixedly connected to the lower end of the L-shaped clamping block 65. The end of the second spring telescopic rod 66 away from the L-shaped clamping block 65 is fixed to the arc-shaped telescopic plate 61. The end of the L-shaped clamping block 65 close to the sliding plate 63 is an inclined surface.

[0022] In this embodiment, as Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown in Figure 7 , a groove 51 is provided at the bottom end of the resistance disk 5. The inner wall of the groove 51 is in contact with one end of the sliding plate 63. A wedge-shaped block 52 is inserted through the resistance disk 5. The inclined surface at the end of the wedge-shaped block 52 abuts against the inclined surface 67. A return spring telescopic rod 53 is installed on the wedge-shaped block 52. One end of the return spring telescopic rod 53 is fixed to the resistance disk 5. A third spring telescopic rod 54 is fixedly connected to the side surface of the wedge-shaped block 52. Two cut surfaces are provided at the end of the third spring telescopic rod 54 away from the wedge-shaped block 52. The end of the third spring telescopic rod 54 with an inclined surface abuts against the inside of the L-shaped clamping block 65.

[0023] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown in Figure 4 , the three-fold plate 44 is formed by hinging two parallel plates and a vertical plate.

[0024] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown in Figure 4 , an anti-slip ring is provided on the outer ring of the one-way bearing 48.

[0025] Construction method and advantages of the present invention: The construction method of the construction device for the steel casing of bored cast-in-place piles is as follows: As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5, Figure 6 , Figure 7 as shown in: S1: Connect the upper end of the fixed rod 1 to the head of the pile driver. Then, extend one end of the hydraulic cylinder 41 into the steel casing through the pile driver. When the hydraulic cylinder 41 extends, drive the three-fold plate 44 on it to contact the convex block 43 and deflect, so that the vertical plate on the three-fold plate 44 contacts the inner wall of the steel casing. Then, drive the steel casing to move to the designated position through the pile driver and insert its lower end into the designated area; Then, when the hydraulic cylinder 41 contracts, drive the vertical plate of the three-fold plate 44 to separate from the inner wall of the steel casing. At this time, drive the pressure plate 2 and the support frame 3 to move downward through the pile driver, so that the spring telescopic tube 45 contracts and cooperates with the parallel rod 46 to drive the pressing block 49 to contact the upper side of the resistance plate 5. At this time, the parallel rod 46 deflects to drive the four arc-shaped clamping plates 47 to move towards the central axis of the spring telescopic tube 45, and then contact the outside of the steel casing and fix it. Then, continue to push the spring telescopic tube 45 downward through the pile driver. At this time, the spring telescopic tube 45 has contracted to the shortest value, and the lower end of the spring telescopic tube 45 pushes the resistance plate 5 downward, so that the inclined surface 67 provided on the sliding plate 63 inside the resistance plate 5 squeezes the wedge block 52 to move. The cooperation of the wedge block 52 and the third spring telescopic rod 54 drives the L-shaped clamping block 65 stuck on the sliding plate 63 to move and separate from it, unlocking the locking state of the L-shaped clamping block 65 on the sliding plate 63; S2: At this time, the resistance plate 5 continues to move downward under the thrust of the pile driver, so that the tangent surface on the lower side of the end of the third spring telescopic rod 54 contacts the inner side of the L-shaped clamping block 65, and drives the third spring telescopic rod 54 to contract to ensure the stable downward movement of the resistance plate 5. At this time, the steel casing continues to penetrate into the soil under the clamping force of the four arc-shaped clamping plates 47 and the one-way bearing 48 inside it. When the resistance plate 5 moves downward, it drives the damping spring telescopic rod 64 to compress. When the damping spring telescopic rod 64 contracts to the shortest value, the pile driver starts to drive the fixed rod 1 to move upward. At this time, the outer ring of the one-way bearing 48 rolls on the outside of the steel casing, reducing the friction between the one-way bearing 48 and the outer wall of the steel casing; S3: When the pile driver drives the fixed rod 1 to move upward, the damping spring telescopic rod 64 has a damping force during elongation, so as to ensure that when the pile driver drives the fixed rod 1 to move upward, the lower end of the resistance plate 5 is separated from the sliding plate 63. At this time, the resistance plate 5 is separated from the bottom surface of the pressing block 49 under the action of the restoring force of the spring telescopic tube 45. And at this time, the parallel rod 46 drives the pressing block 49 to be separated from the outer wall of the steel casing under the action of the pulling force of the first spring telescopic rod 410, that is, the locking state of the arc-shaped clamping plate 47 on the steel casing is unlocked. And during the upward movement of the resistance plate 5, the upper side of the end of the third spring telescopic rod 54 abuts against the lower side of the L-shaped clamping block 65. After the auxiliary pulling of the damping spring telescopic rod 64 is reset, the L-shaped clamping block 65 cannot continue to move upward. At this time, the lower side of the third spring telescopic rod 54 abuts against the lower side of the L-shaped clamping block 65 and contracts under force, and moves to the upper side of the L-shaped clamping block 65, that is, the reset of the device is completed. Then, the pile driver drives the fixed rod 1 to move downward again to realize the insertion of the steel casing into the soil. Repeat this process to insert the steel casing into the specified soil.

[0026] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A bored pile steel casing construction device, comprising a fixing rod (1), characterized in that: A pressure plate (2) is installed at the lower end of the fixing rod (1), a support frame (3) is installed directly below the pressure plate (2), and a tubular locking and pressing mechanism (4) is fixedly connected to the lower end of the support frame (3), so that the steel casing is locked and pushed downwards during the pressing process of the tubular locking and pressing mechanism (4) to drive the steel casing into the soil; A resistance disk (5) is provided on the lower end of the tubular locking and pressing mechanism (4), a support and limiting mechanism (6) is provided on the outer side of the resistance disk (5), and the support and limiting mechanism (6) is mounted on the support frame (3); The tubular locking and pressing mechanism (4) comprises a hydraulic cylinder (41) fixed to the lower side of the support frame (3), a limiting sleeve (42) being mounted on the hydraulic cylinder (41), and a protrusion (43) being fixedly connected to a through groove on the surface of the limiting sleeve (42); Four three-fold plates (44) are hinged on the inner rod of the hydraulic cylinder (41), and the four three-fold plates (44) are equidistantly distributed in a ring shape, and the three-fold plates (44) are slidably arranged in the through groove of the limiting sleeve (42).

2. The bored pile steel casing construction device according to claim 1 is characterized in that: The tubular locking and pressing mechanism (4) further comprises a spring telescopic tube (45) fixed to the end of the support frame (3), sixteen parallel rods (46) are hingedly connected to the inner wall of the inner tube of the spring telescopic tube (45), and the sixteen parallel rods (46) are grouped in four, and the parallel rods (46) in a group of four are distributed in a rectangular shape, and a first spring telescopic rod (410) is hingedly connected between the eight parallel rods (46) on the lower side and the inner tube of the spring telescopic tube (45); The parallel rods (46) in a group of four are hingedly connected to an arc-shaped clamping plate (47) at one end away from the inner tube of the spring telescopic tube (45), and a one-way bearing (48) is installed on the arc-shaped clamping plate (47). The lower end of the arc-shaped clamping plate (47) is fixedly connected to a pressure block (49), and the pressure block (49) and the lower end of the inner tube of the spring telescopic tube (45) are in contact with the resistance plate (5).

3. The bored pile steel casing construction device according to claim 2 is characterized in that: The support limiting mechanism (6) comprises an arc-shaped telescopic plate (61) fixed on both ends of the support frame (3); a sliding groove (62) is provided on the outer sleeve of the arc-shaped telescopic plate (61); a sliding plate (63) is slidably connected in the sliding groove (62); and two inclined surfaces (67) are provided on one end of the sliding plate (63) located on the inner side of the arc-shaped telescopic plate (61); a damping spring telescopic rod (64) is fixedly connected between the sliding plate (63) and the bottom plate of the arc-shaped telescopic plate (61); An L-shaped clamping block (65) is inserted into the outer sleeve of the arc-shaped telescopic plate (61), one end of the L-shaped clamping block (65) extends into the interior of the slide groove (62) and is inserted into a wedge-shaped groove provided on the slide plate (63), and a second spring telescopic rod (66) is fixedly connected to the lower end of the L-shaped clamping block (65), and one end of the second spring telescopic rod (66) away from the L-shaped clamping block (65) is fixed to the arc-shaped telescopic plate (61).

4. The bored pile steel casing construction device according to claim 3 is characterized in that: A groove (51) is provided at the bottom end of the resistance disk (5), and the inner wall of the groove (51) is fitted with one end of the slide plate (63). A wedge block (52) is inserted into the resistance disk (5), and the inclined surface of the end of the wedge block (52) abuts against the inclined surface (67). A return spring telescopic rod (53) is installed on the wedge block (52), and one end of the return spring telescopic rod (53) is fixed to the resistance disk (5). A third spring telescopic rod (54) is fixedly connected to the side of the wedge block (52), and two cut surfaces are provided on the end of the third spring telescopic rod (54) away from the wedge block (52), and the end of the third spring telescopic rod (54) with the inclined surface is overlapped on the inner side of the L-shaped clamping block (65).

5. The bored pile steel casing construction device according to claim 1 is characterized in that: The three-fold plate (44) is formed by hingedly connecting two parallel plates and a vertical plate.

6. The bored pile steel casing construction device according to claim 2 is characterized in that: An anti-slip ring is provided on the outer ring of the one-way bearing (48).

7. The construction method of the bored pile steel casing construction device according to claim 4 is characterized by: The steps include: S1: The upper end of the fixing rod (1) is connected to the head of the pile driver, and then one end of the hydraulic cylinder (41) is extended into the steel casing by the pile driver, and the hydraulic cylinder (41) is extended to drive the tri-fold plate (44) on it to abut against the protrusion (43) and deflect, so that the vertical plate on the tri-fold plate (44) abuts against the inner wall of the steel casing, and then the pile driver drives the steel casing to move to a designated position and insert its lower end into a designated area; Then, the hydraulic cylinder (41) is retracted to drive the vertical plate of the three-fold plate (44) to separate from the inner wall of the steel casing. At this time, the pile driver drives the pressure plate (2) and the support frame (3) to move downward, so that the spring telescopic tube (45) contracts and cooperates with the parallel rod (46) to drive the pressure block (49) to abut against the upper side of the resistance plate (5). At this time, the parallel rod (46) deflects and drives the four arc-shaped clamping plates (47) to move toward the central axis of the spring telescopic tube (45), thereby abutting against the outer side of the steel casing and fixing it. Then, the pile driver is continued to The spring telescopic tube (45) is continuously pushed downward. At this time, the spring telescopic tube (45) has been retracted to the shortest value, and the lower end of the spring telescopic tube (45) pushes the resistance plate (5) downward, so that the inclined surface (67) provided on the slide plate (63) inside the resistance plate (5) squeezes the wedge block (52) to move, and the wedge block (52) and the third spring telescopic rod (54) cooperate to move to drive the L-shaped block (65) stuck on the slide plate (63) to move and separate from it, thereby unlocking the locking state of the L-shaped block (65) on the slide plate (63); S2: At this time, the resistance plate (5) continues to move downward under the thrust of the pile driver, so that the cut surface on the lower side of the end of the third spring telescopic rod (54) contacts the inner side of the L-shaped clamping block (65), pushing the third spring telescopic rod (54) to contract, ensuring that the resistance plate (5) moves downward stably. At this time, the steel casing continues to extend into the soil under the clamping force of the four arc-shaped clamping plates (47) and the one-way bearing (48) inside it. When the resistance plate (5) moves downward, it pushes the damping spring telescopic rod (64) to be compressed. When the damping spring telescopic rod (64) contracts to the shortest value, the pile driver starts to drive the fixed rod (1) to move upward. At this time, the outer ring of the one-way bearing (48) rolls on the outer side of the steel casing, reducing the friction between the one-way bearing (48) and the outer wall of the steel casing; S3: When the pile driver drives the fixed rod (1) to move upward, the damping spring telescopic rod (64) has a moving damping force when it is extended, thereby ensuring that when the pile driver drives the fixed rod (1) to move upward, the lower end of the resistance plate (5) is separated from the slide plate (63). At this time, the resistance plate (5) is separated from the bottom surface of the pressure block (49) under the action of the reset force of the spring telescopic tube (45), and at this time, the parallel rod (46) drives the pressure block (49) to separate from the outer wall of the steel casing under the action of the pulling force of the first spring telescopic rod (410), that is, the locking state of the arc clamping plate (47) on the steel casing is unlocked, and at the resistance plate (5), the pressure block (49) is separated from the outer wall of the steel casing. During the upward movement of the disk (5), the cut surface on the upper side of the end of the third spring telescopic rod (54) abuts against the lower side of the L-shaped block (65). After the auxiliary pull-damping spring telescopic rod (64) is reset, the L-shaped block (65) cannot move upward any further. At this time, the cut surface on the lower side of the third spring telescopic rod (54) abuts against the lower side of the L-shaped block (65) and contracts under force, and moves to the upper side of the L-shaped block (65), completing the reset of the device. Then, the pile driver drives the fixing rod (1) downward again, so that the steel casing is extended into the soil. The steel casing is inserted into the designated soil in this reciprocating manner.

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