CN217267410U - Large-diameter cast-in-place pile periphery complex root key jacking implantation device - Google Patents

Abstract

The utility model discloses a complex root key jacking implantation device around a large-diameter cast-in-place pile, which consists of an outer cylinder, an inner cylinder, a root key storage cabin, a guide chute, a double-line jack and a root key cover; eight key outlets are arranged on the outer cylinder body, a bottom plate is arranged at the bottom of the outer cylinder body, and a top plate is arranged at the top end of the outer cylinder body; the root key storage cabin is arranged above the root key outlet, and the guide sliding chutes are uniformly arranged on the outer side of the outer cylinder body and matched with the sliding body steel bars on the steel bar cage framework; the double-thread jack is fixed on the bottom plate of the outer cylinder body, and the end part of the hydraulic support rod is provided with a root key cover; the root key pushing device is internally provided with a root key storage cabin and a double-line-stroke jack, the pushing device only needs to put down a bored concrete pile hole once, and the problems that the construction period is long, the construction precision is low, hole shrinkage and hole collapse are easy to occur and the like in the conventional root key that the root key is pulled out of the hole of the pushing device and then put down to a specified position for pushing in each construction can be solved; the double-thread jack can realize staggered pushing of an upper layer and a lower layer; thereby forming a dislocation root bond.

Description

Large-diameter cast-in-place pile periphery complex root key jacking implantation device

Technical Field

The utility model relates to a root key top advances construction in the root key bored concrete pile, concretely relates to complicated root key top in major diameter bored concrete pile week advances implantation device structure.

Background

The root key cast-in-place pile is a bionic pile foundation formed by placing a reinforcement cage to a designed elevation and then pushing and prefabricating root keys. The bearing capacity is greatly improved due to the compaction and stress diffusion effects of the pushing root bond; and because the root key and the soil body are tightly embedded, the uplift resistance of the foundation is greatly improved, and the unique structural form brings a new revolution and progress to the structural form of the pile foundation.

However, most of the root keys in the existing root key cast-in-place pile construction are located in poor geology such as fine silt and the like, and the steel reinforcement cage is lowered and the duration of the root key jacking is long, so that quality accidents such as hole shrinkage, hole collapse and the like are easily caused in the hole wall drilling and root key jacking processes; the upper layer root keys and the lower layer root keys are usually arranged in a straight line, so that dislocation root keys cannot be effectively formed, if the pushing device is pulled out of the hole and then rotated, the construction period and the cost are greatly increased, and a simple and feasible dislocation root key construction mode is not provided; the perpendicularity control of the root key pile foundation construction steel reinforcement cage is not in place, so that the root key jacking equipment is difficult to transfer or lift, and once the jacking device drives the steel reinforcement cage in the construction process, the jacking position of the root key cannot be accurately judged, and the construction quality is seriously influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a complicated root key top of major diameter bored concrete pile week is advanced and is implanted device to the problem that current root key bored concrete pile construction exists, adopts following technical scheme.

A complex root key top implantation device around a large-diameter cast-in-place pile is characterized by comprising an outer cylinder, an inner cylinder, a root key storage cabin, a guide chute, a double-line-path jack and a root key cover; the bottom of the outer cylinder body is provided with a bottom plate, the upper part of the bottom plate is provided with eight key outlets, and the top end of the outer cylinder body is provided with a top plate; the top plate is provided with hydraulic control wire holes, the bottom plate is provided with eight annular limiting grooves which are symmetrically arranged, two side edges in each limiting groove are provided with a sliding groove and a sliding groove base, a U-shaped buffer cushion is arranged between the sliding grooves on the two sides, so that the prefabricated root key is limited at the central part, and the outer sides of the limiting grooves in the length direction are provided with baffle plates, so that the root key is limited to be covered in the outer cylinder; the outer cylinder body is connected with a surface reaction system through a standard lifting pipe joint; the bottom of the inner cylinder body is provided with a bottom gap matched with the root key cover, the top of the inner cylinder body is provided with a top flange plate, the middle part of the inner cylinder body is provided with a hydraulic control line hole matched with the outer cylinder body, and the inner cylinder body is connected with the top plate of the outer cylinder body through the top flange plate; the root key storage cabin is arranged above the root key outlet, two sides of the bottommost part of the root key storage cabin are provided with interval bases, a T-shaped groove is arranged in each interval base, and a rubber layer is arranged on the side wall in the cabin body along the height direction; the guide sliding chutes are uniformly arranged on the outer side of the outer cylinder body and are matched with the sliding body steel bars on the steel bar cage framework; the double-thread jack is fixed in the center of the bottom plate of the outer cylinder body, the jacking and retraction of the hydraulic support rod are controlled through a control line, and the end part of the hydraulic support rod of the jack is provided with a root key cover which can sequentially pass through a notch at the bottom of the inner cylinder body and a root key outlet of the outer cylinder body; the root key cover is a square cavity cover body for wrapping the prefabricated root key, four corners of the outer side of the root key cover are provided with chamfers, the bottom of the root key cover is provided with smooth sliding strips, and the positions of the smooth sliding strips correspond to the sliding grooves in the limiting grooves; the top is provided with a supporting bracket; the support bracket includes an enlarged sliding end, a connecting plate and an arc bracket.

Preferably, the length range of the limiting groove is between the outer cylinder body and the inner cylinder body.

Preferably, the number of the root key outlets is the same as that of the jack hydraulic struts; the limiting groove, the root key storage cabin, the outer barrel root key outlet, the bottom notch of the inner barrel and the moving direction of the jack root key cover are matched.

Preferably, the length of the standard lifting pipe joint is matched with the height of the prefabricated root key, the standard lifting pipe joint is connected with the prefabricated root key through the end flange plate bolt, and the jacking position elevation of the prefabricated root key is accurately controlled according to the standard lifting pipe joint.

Preferably, the reaction system comprises a bottom centering positioning frame, a positioning base and an upper reaction frame body, and the positions of the outer barrel body and the inner barrel body are controlled by lifting the standard lifting pipe sections section by section.

Preferably, the double-stroke jack is provided with eight hydraulic supporting rods, the hydraulic supporting rods are divided into a first-stroke jack supporting rod and a second-stroke jack supporting rod at intervals, and jacking and retraction of the first-stroke jack supporting rod and the second-stroke jack supporting rod are mutually independent in a working state, so that a root key which is staggered up and down is formed on the cast-in-place pile.

Preferably, the prefabricated root key comprises a truncated cone-shaped tip, a cylindrical root key body and a truncated cone-shaped guide bottom, wherein a small-diameter cylindrical superposed cavity is formed in the middle of the root key body, a reserved rib is arranged in the middle of the root key body, and the prefabricated root key and later poured concrete can form an occluded whole; and after the prefabricated root key is jacked, the superposed cavity is positioned in the area between the cast-in-place pile hole and the reinforcement cage.

Preferably, the root key cover and the top supporting bracket move along with the hydraulic support rod of the jack, and the prefabricated root key at the upper part is supported in the jacking process; the prefabricated root key of upper portion drops to the U type blotter of bottom plate spacing groove at hydraulic pressure branch retraction in-process to carry out the bearing to the prefabricated root key of upper portion under next hydraulic pressure effect.

Preferably, the smooth draw runner in root key cover bottom moves on spacing inslot spout, and the top supports the support and enlarges the slip end and remove in interval base T type inslot.

The utility model relates to a technical scheme, the beneficial effect who compares with the conventional art is:

1. the root key storage cabin is arranged inside the root key pushing device, the pushing device only needs to transfer the cast-in-place pile hole once, the problems that the traditional root key is used for pulling out the pushing device from the hole and placing the root key at each time, and the specified position is transferred again to perform pushing construction, so that the construction period is long, the construction precision is low, and the hole shrinkage and collapse are easy to occur are solved.

2. Symmetrical eight-direction jacks are arranged in the complex root key top implanting device, and can realize staggered top and bottom layer pushing under the action of a double-thread control line; thereby forming a dislocation root key and further improving the uplift resistance and the bearing capacity of the root key cast-in-place pile.

3. The lifting height of the standard lifting pipe joint and the pushing position of the root key are controlled by the positioning device on the steel reinforcement cage, so that the accurate installation and positioning of the root key are ensured.

4. The complex root key jacking implantation device is internally provided with an inner cylinder and a hydraulic jack and is fixedly connected with a ground reaction frame through a standard lifting pipe joint, so that the jacking reliability in the hydraulic jacking process can be ensured.

5. The two end parts of the prefabricated root key are respectively a tip head part and a guide bottom part, so that the prefabricated root key can be jacked into the root key outlet of the implantation device from the complex root key to be discharged and effectively inserted into the soil mass around the pile; and the root key body is provided with the superposed cavity and the reserved ribs, so that the root key can be effectively combined with the pile body after cast-in-place pile concrete, and the position of the root key is ensured.

6. The complex root key is pushed into and is planted device root key storage cabin bottom and be equipped with the interval base, pushes away the in-process at prefabricated root key and carries out effective support to prefabricated root key in upper portion, does not influence prefabricated root key of lower part and pushes away the construction.

Drawings

FIG. 1 is a schematic diagram of a complex root key jacking implantation device around a large-diameter cast-in-place pile;

FIG. 2 is a schematic diagram of a large-diameter cast-in-place pile after the complex root key is jacked into the implantation device;

fig. 3 is a cross section before the jacking of the complex root key jacking implantation device around the pile of the large-diameter cast-in-place pile (a cross section A-A in fig. 1);

FIG. 4 is a cross-sectional view (section B-B in FIG. 2) of the complex root key jacking implantation device around the pile of the large-diameter cast-in-place pile;

FIG. 5 is a sectional view of an outlet of a complex root key at the periphery of a large-diameter cast-in-place pile, which is pushed into an implantation device by the root key (section 1-1 in FIG. 1);

FIG. 6 is a cross-sectional view of the bottom plate of the outer cylinder (section 2-2 in FIG. 1);

FIG. 7 is a cross-sectional view (section 3-3 in FIG. 1) of a prefabricated root key tip in a storage compartment of a root key prior to being pushed into the storage compartment;

FIG. 8 is a sectional view of a preformed root key overlapping cavity preformed rib in the jacking forward root key storage compartment (section 4-4 in FIG. 1);

FIG. 9 is a cross-sectional view of the bottom of the guide of the prefabricated root key in the storage compartment after the root key is pushed in (section 5-5 in FIG. 2);

FIG. 10 is a schematic view of the outer barrel floor;

FIG. 11 is a three-dimensional schematic view of the bottom plate of the outer cylinder;

FIG. 12 is a top view of the outer barrel base plate;

FIG. 13 is a schematic cross-sectional view of the root key outlet (section 6-6 in FIG. 6);

FIG. 14 is a cross-sectional view of the outer barrel floor baffle (section 7-7 in FIG. 12);

FIG. 15 is a sectional view of a bottom plate limiting groove of the outer cylinder (section 8-8 in FIG. 12);

FIG. 16 is a schematic view of the outer barrel construction;

FIG. 17 is a schematic view of the inner barrel structure;

FIG. 18 is a cross-sectional view of the inner barrel;

FIG. 19 is a schematic view of the connection of the inner cylinder to the base plate (cut surface of the stopper groove);

FIG. 20 is a schematic view of the connection of the inner cylinder to the base plate (non-limiting groove cross section);

FIG. 21 is a schematic view of a root key cover configuration;

FIG. 22 is a schematic cross-sectional view of a root key boot;

FIG. 23 is a schematic cross-sectional view of a preform root key;

FIG. 24 is a cross-sectional view of the tip end of the root key preform (section 9-9 in FIG. 23);

FIG. 25 is a cross-sectional view of a preform root key body (section 10-10 in FIG. 23);

FIG. 26 is a cross-sectional view of the bottom of the root key guide (section 11-11 in FIG. 23);

FIG. 27 is a schematic view of a bored hole of an example of an embodiment of a cast-in-place pile;

FIG. 28 is a schematic representation of the embodiment after lowering of the root key into the implant device;

FIG. 29 is a schematic view showing the pushing operation of the root key pushing implant device in the embodiment;

FIG. 30 is a schematic view of the prefabricated root key jacking construction in the embodiment (first stroke jack strut jacking);

FIG. 31 is a schematic diagram of the jacking construction of the prefabricated root key in the embodiment (second-stroke jack support rod jacking);

fig. 32 is a structural schematic diagram of a large-diameter root-key cast-in-place pile in the embodiment.

The drawing is marked with: 1-outer cylinder, 101-root key outlet, 2-top plate, 201-hydraulic control line hole, 3-bottom plate, 301-limit groove, 302-U-shaped buffer cushion, 303-slide groove, 304-slide groove base, 305-baffle plate, 4-root key storage cabin, 401-rubber layer, 402-side wall, 403-interval base, 404-T-shaped groove, 5-guide slide groove, 6-root key cover, 601-chamfer, 602-smooth slide bar, 603-support bracket, 6031-enlarged slide end, 6032-connecting plate, 6033-arc bracket, 7-inner cylinder, 701-bottom notch, 702-top flange plate, 8-standard lifting pipe joint, 801-flange plate, 9-bolt, 10-stroke double-line jack, 1001-control line, 1002-hydraulic support rod, 1003-, 11-steel reinforcement cage, 1101-sliding body steel bar, 12-prefabricated root key, 1201-pointed tip, 1202-root key body, 1203-superposition cavity, 1204-reserved steel bar, 1205-guide bottom, 13-cast-in-place pile hole, 14-counterforce system, 1401-centering positioning frame, 1402-positioning base, 1403-counterforce frame body, 15-soil layer, 1501-counterforce key soil layer, 1502-non-root key soil layer, 16-earth surface and 17-welding line.

Detailed Description

In order to deepen understanding of the present invention, the embodiments of the present invention will be described in detail below with reference to fig. 1 to fig. 32, and the following embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments are given, but the scope of protection of the present invention is not limited to the following embodiments.

In the embodiment, the length of a cast-in-place pile hole 13 is 15m, the diameter is 1.6m, the height difference of root keys of an upper layer and a lower layer is 0.5m, and 4 prefabricated root keys 12 are arranged on each layer; the root key jacking implantation device is manufactured according to the size of a root key cast-in-place pile, wherein the diameter of an outer cylinder body 1 is 1.5m, the diameter of an inner cylinder body 7 is 0.7m, the height of the inner cylinder body is 10m, 10 prefabricated root keys 12 are respectively placed in a root key storage cabin 4, the length of each prefabricated root key 12 is 0.35m, each root key extends out of the outer side of a cast-in-place pile hole 13 by 0.25m, the diameter of a standard lifting pipe joint 8 is 0.7m, the height of each joint is 1.0m, and root key jacking construction is carried out twice each time.

With reference to fig. 1 and 2, the complex root key jacking implantation device for the periphery of the large-diameter cast-in-place pile consists of an outer cylinder 1, an inner cylinder 7, a root key storage cabin 4, a guide sliding groove 5, a double-thread jack 10 and a root key cover 6.

Referring to fig. 10, 13, 14 and 16, a bottom plate 3 is arranged at the bottom of the outer cylinder 1, eight key outlets 101 are arranged at the upper part of the bottom plate 3, and a top plate 2 is arranged at the top end of the outer cylinder 1; the top plate 2 is provided with a hydraulic control wire hole 201, and as shown in fig. 10 to fig. 12, the bottom plate 3 is provided with eight annular limiting grooves 301 which are symmetrically arranged, two side edges in the limiting grooves 301 are provided with sliding grooves 303 and sliding groove bases 304, and a U-shaped cushion 302 is arranged between the sliding grooves 303 at the two sides, so that the prefabricated root key 12 is limited at the central part; referring to fig. 15, a baffle 305 is disposed at the outer side of the limiting groove 301 in the length direction, so as to limit the root key cover 6 inside the outer cylinder 1; the outer cylinder 1 is connected to a reaction system 14 at the surface 16 via a standard riser joint 8.

Referring to fig. 17, 18, 19 and 20, the bottom of the inner cylinder 7 is provided with a bottom notch 701 matched with the root key cover 6, the top is provided with a top flange plate 702, the middle part of the inner cylinder is provided with a hydraulic control line hole 201 matched with the outer cylinder 1, and the inner cylinder 7 is connected with the top plate 2 of the outer cylinder 1 through the top flange plate 702;

referring to fig. 7 to 9, the root key storage compartment 4 is disposed above the root key outlet 101, two sides of the bottom of the root key storage compartment 4 are provided with a spacing base 403, a T-shaped groove 404 is disposed inside the spacing base 403, and a rubber layer 401 is disposed on a side wall 402 inside the compartment body along the height direction; referring to fig. 2, the root key cover 6 and the top support bracket 603 move along with the jack hydraulic support rod 1002, and support the upper prefabricated root key 12 in the jacking process; in the retraction process of the hydraulic support rod 1002, the upper prefabricated root key 12 falls to the U-shaped cushion pad 302 of the limiting groove 301 of the bottom plate 1, and the upper prefabricated root key 12 is supported under the next hydraulic action; the smooth sliding bar 602 at the bottom of the keymat 6 moves on the sliding groove 303 in the limiting groove 301, and the top supporting bracket 603 enlarges the sliding end 6031 to move in the T-shaped groove 404 of the spacing base 403.

Referring to fig. 3 to 6, the guide chutes 5 are uniformly formed on the outer side of the outer cylinder 1 and are matched with the slide bars 1101 on the framework of the reinforcement cage 11.

Referring to fig. 4 and 5, a double-thread jack 10 is fixed in the center of a bottom plate 3 of an outer cylinder 1, a control line 1001 is used for controlling a hydraulic support rod 1002 to jack in and retract, and a key cover 6 is arranged at the end of the hydraulic support rod 1002 of the jack and can sequentially penetrate through a notch 701 at the bottom of an inner cylinder 7 and a key outlet 101 of the outer cylinder 1; the number of the root key outlets 101 is the same as that of the jack hydraulic struts 1002; the limiting groove 301, the root key storage cabin 4, the root key outlet 101 of the outer cylinder body 1, the bottom notch 701 of the inner cylinder body 7 and the moving direction of the jack root key cover 6 are matched; referring to fig. 30 and 31, the dual-stroke jack 10 is provided with eight hydraulic struts 1002, the hydraulic struts 1002 are divided into a first-stroke jack strut and a second-stroke jack strut at intervals, and the jacking and retraction of the first-stroke jack strut and the second-stroke jack strut are independent from each other in a working state, so that a vertically staggered root key is formed on the cast-in-place pile.

With reference to fig. 21 and 22, the root key cover 6 is a square cavity cover body for wrapping the prefabricated root key 12, four corners of the outer side of the square cavity cover body are provided with chamfers 601, the bottom of the square cavity cover body is provided with smooth sliding strips 602, and the positions of the chamfers correspond to those of the sliding grooves 303 in the limiting groove 301; the top is provided with a supporting bracket 603; the support bracket 603 includes an enlarged slide end 6031, a connection plate 6032, and an arc bracket 6033.

Referring to fig. 11 and 12, the length of the limiting groove 301 is between the outer cylinder 1 and the inner cylinder 7.

Referring to fig. 28 and 29, the length of the standard lifting pipe joint 8 is matched with the height of the prefabricated root key 12, the standard lifting pipe joint is connected with the prefabricated root key 12 through the end flange plate 801 and the bolt 9, and the elevation of the jacking position of the prefabricated root key 12 is accurately controlled according to the standard lifting pipe joint 8; the reaction system 14 comprises a bottom centering positioning frame 1401, a positioning base 1402 and an upper reaction frame 1403, and the positions of the outer cylinder 1 and the inner cylinder 7 are controlled by lifting the standard lifting pipe joint 8 section by section.

With reference to fig. 23 to 26, the prefabricated root key 12 includes a truncated cone-shaped tip 1201, a cylindrical root key body 1202 and a truncated cone-shaped guide bottom 1205, and a small-diameter cylindrical overlapping cavity 1203 is formed in the middle of the root key body 1202, and a reserved rib 1204 is formed, so that the prefabricated root key and the later poured concrete can form an engaged whole; referring to fig. 4 again, after the prefabricated root key 12 is completely pushed in, the position of the superposition cavity 1203 is located in the area between the cast-in-place pile hole 13 and the reinforcement cage 11.

In order to achieve the structure, the following construction steps are adopted for construction in combination with the accompanying drawings 27-32:

firstly, drilling a cast-in-place pile hole 13 according to the scheme, producing a prefabricated root key 12, and transporting to the site after the strength is reached.

Secondly, assembling a root key top implantation device consisting of an outer cylinder body 1, an inner cylinder body 7, a root key storage cabin 4, a guide sliding chute 5, a double-thread jack 10 and a root key cover 6, welding and fixing a non-bottom gap 701 of the inner cylinder body 7 on a bottom plate 3 through a welding seam 17, and filling a specified number of prefabricated root keys 12.

Then, manufacturing a cast-in-place pile reinforcement cage 11 with sliding body steel bars 1101, and putting down to the hole bottom of a cast-in-place pile hole 13; synchronously jacking the root key into the implantation device for lowering; a counterforce system 14 is installed on the ground surface 16 and is connected with the outer cylinder body 1 into a whole through the extension standard lifting pipe joint 8.

And thirdly, uniformly lifting the first-order jack support rod and the second-order jack support rod, jacking the prefabricated root key 12 in an interval jacking mode until the designed elevation of the cast-in-place pile is reached, and lifting out the root key to jack the implantation device.

Finally, the cast-in-place pile hole 13 is subjected to concrete pouring through a guide pipe, so that the large-diameter root key cast-in-place pile is formed.

The above embodiments are only used for explaining the technical idea of the present invention, not for limiting the protection of the present invention, and all the applications of this idea are to the insubstantial changes of the present invention, which all fall into the protection scope of the present invention.

Claims (9)

1. A complex root key top implantation device around a large-diameter cast-in-place pile is characterized by comprising an outer cylinder body (1), an inner cylinder body (7), a root key storage cabin (4), a guide sliding chute (5), a double-line-path jack (10) and a root key cover (6);

a bottom plate (3) is arranged at the bottom of the outer cylinder body (1), eight key outlets (101) are arranged at the upper part of the bottom plate (3), and a top plate (2) is arranged at the top end of the outer cylinder body (1); the prefabricated root key is characterized in that a hydraulic control line hole (201) is formed in the top plate (2), eight annular limiting grooves (301) are symmetrically arranged on the bottom plate (3), sliding grooves (303) and sliding groove bases (304) are formed in two side edges in each limiting groove (301), a U-shaped buffer pad (302) is arranged between the sliding grooves (303) in two sides, so that the prefabricated root key (12) is limited in the central part, and a baffle (305) is arranged on the outer side of the limiting groove (301) in the length direction, so that the root key cover (6) is limited in the outer barrel body (1); the outer cylinder body (1) is connected with a counterforce system (14) on the earth surface (16) through a standard lifting pipe joint (8);

the bottom of the inner cylinder (7) is provided with a bottom notch (701) matched with the root key cover (6), the top of the inner cylinder is provided with a top flange plate (702), the middle part of the inner cylinder is provided with a hydraulic control line hole (201) matched with the outer cylinder (1), and the inner cylinder (7) is connected with the top plate (2) of the outer cylinder (1) through the top flange plate (702);

the root key storage cabin (4) is arranged above the root key outlet (101), two sides of the bottommost part of the root key storage cabin (4) are provided with interval bases (403), T-shaped grooves (404) are formed in the interval bases (403), and a rubber layer (401) is arranged on the side wall (402) in the cabin body along the height direction;

the guide sliding chutes (5) are uniformly arranged on the outer side of the outer cylinder body (1) and are matched with sliding steel bars (1101) on a framework of the steel bar cage (11);

the double-thread jack (10) is fixed in the center of the bottom plate (3) of the outer cylinder (1), the jacking and retraction of the hydraulic support rod (1002) are controlled through a control line (1001), and the end part of the hydraulic support rod (1002) of the jack is provided with a root key cover (6) which can sequentially penetrate through a bottom notch (701) of the inner cylinder (7) and a root key outlet (101) of the outer cylinder (1);

the root key cover (6) is a square cavity cover body wrapping the prefabricated root key (12), four corners of the outer side of the root key cover are provided with chamfers (601), the bottom of the root key cover is provided with smooth sliding strips (602), and the positions of the chamfer angles correspond to those of the inner sliding grooves (303) of the limiting groove (301); the top is provided with a supporting bracket (603); the supporting bracket (603) comprises an enlarged sliding end (6031), a connecting plate (6032) and an arc-shaped bracket (6033).

2. The device for implanting the complicated root key top around the large-diameter cast-in-place pile according to the claim 1, wherein the length range of the limiting groove (301) is between the outer cylinder (1) and the inner cylinder (7).

3. The pile periphery complex root key top implantation device of the large-diameter cast-in-place pile according to claim 1, wherein the number of the root key outlets (101) is the same as that of the jack hydraulic struts (1002); the limiting groove (301), the root key storage cabin (4), the outer barrel (1) and the root key outlet (101), the bottom notch (701) of the inner barrel (7) and the moving direction of the jack root key cover (6) are matched.

4. The device for implanting the complicated root key top around the large-diameter cast-in-place pile according to the claim 1, characterized in that the length of the standard lifting pipe joint (8) is matched with the height of the prefabricated root key (12), the standard lifting pipe joint is connected with the prefabricated root key (12) through a bolt (9) of an end flange plate (801), and the elevation of the jacking position of the prefabricated root key (12) is accurately controlled according to the standard lifting pipe joint (8).

5. The device for implanting the complicated root key top around the large-diameter cast-in-place pile according to the claim 1, characterized in that the reaction system (14) comprises a bottom centering positioning frame (1401), a positioning base (1402) and an upper reaction frame body (1403), and the positions of the outer cylinder (1) and the inner cylinder (7) are controlled by lifting a standard lifting pipe joint (8).

6. The pile periphery complex root key jacking and implanting device of the large-diameter cast-in-place pile according to claim 1, characterized in that the double-stroke jack (10) is provided with eight hydraulic struts (1002), the hydraulic struts (1002) are divided into a first-stroke jack strut and a second-stroke jack strut at intervals, and jacking and retraction of the first-stroke jack strut and the second-stroke jack strut are mutually independent in an operating state, so that a root key which is staggered up and down is formed on the cast-in-place pile.

7. The device for implanting the complicated root key top around the large-diameter cast-in-place pile according to the claim 1, is characterized in that the prefabricated root key (12) comprises a truncated cone-shaped tip (1201), a cylindrical root key body (1202) and a truncated cone-shaped guide bottom (1205), wherein a small-diameter cylindrical superposition cavity (1203) is arranged in the middle of the root key body (1202), a reserved rib (1204) is arranged, and the prefabricated root key and the post-cast concrete can form an occlusion whole; and after the prefabricated root key (12) is jacked, the position of the superposition cavity (1203) is positioned in the area between the cast-in-place pile hole (13) and the reinforcement cage (11).

8. The device for implanting the complex root key around the large-diameter cast-in-place pile according to the claim 1, characterized in that the root key cover (6) and the top supporting bracket (603) move along with the hydraulic support rod (1002) of the jack to support the upper prefabricated root key (12) in the process of jacking; the upper prefabricated root key (12) falls to the U-shaped buffer pad (302) of the limiting groove (301) of the bottom plate (3) in the retraction process of the hydraulic support rod (1002), and the upper prefabricated root key (12) is supported under the next hydraulic action.

9. The device for implanting the complicated root key top around the large-diameter cast-in-place pile according to claim 1, wherein the smooth sliding strip (602) at the bottom of the root key cover (6) moves on the sliding groove (303) in the limiting groove (301), and the enlarged sliding end (6031) of the top supporting bracket (603) moves in the T-shaped groove (404) of the spacing base (403).

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