Construction method of large diameter root key cast-in-place piles using complex root key implantation device

Abstract

The present invention discloses a large-diameter root key bored pile construction method using a complex root key implanting device, comprising the following construction steps: drilling bored pile holes, producing prefabricated root keys, assembling root key jacking implanting devices, installing prefabricated root keys, constructing steel cages, lowering root key jacking implanting devices, constructing reaction force systems, constructing root key jacking, and pouring concrete; the root key jacking implanting device is composed of an outer cylinder, an inner cylinder, a root key storage compartment, a guide chute, a double-threaded jack, and a root key cover; a root key storage compartment and a double-threaded jack are arranged inside the root key jacking device, and the jacking device only needs to be lowered into the bored pile hole once, which can solve the problems of long construction period, low construction accuracy, easy occurrence of shrinkage and collapse, etc. in traditional root key construction, which requires pulling out the jacking device from the hole, placing the root key, and then lowering it to a designated position for jacking each time; and the double-threaded jack can realize upper and lower layer dislocation jacking, thereby forming a dislocation root key bored pile.

Description

Technical Field

[0001] The invention relates to root key jacking construction in a root key cast-in-place pile, and in particular to a large-diameter root key cast-in-place pile construction method using a complex root key implanting device. Background Art

[0002] Root-key cast-in-place piles are a bionic pile foundation formed by jacking prefabricated root keys after the steel cage is lowered to the designed elevation. The compaction and stress diffusion of the jacked-up root keys significantly enhance their bearing capacity. Furthermore, the tight embedding of the root keys into the soil significantly increases the foundation's pullout resistance. This unique structural form promises a new round of innovation and advancement in pile foundations.

[0003] However, in the existing root key cast-in-place pile construction, most of the root keys are located in poor geological conditions such as fine silt, and the lowering of the steel cage and the jacking of the root keys take a long time, which can easily cause quality accidents such as shrinkage and collapse of the hole wall during the drilling and root key jacking process; the upper and lower root keys are usually arranged in a straight line, and it is impossible to effectively form dislocated root keys. If the jacking device is pulled out of the hole and then rotated, the construction period and cost will be greatly increased. There is no simple and feasible dislocated root key construction method yet; the verticality of the steel cage in the root key pile foundation construction is not properly controlled, making it difficult to lower or lift the root key jacking equipment. Once the jacking device drives the steel cage during construction, the root key jacking position cannot be accurately determined, which seriously affects the construction quality. Summary of the Invention

[0004] The purpose of the present invention is to address the problems existing in the existing root key cast-in-place pile construction and propose a large-diameter root key cast-in-place pile construction method using a complex root key implanting device.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions.

[0006] A device for jacking and implanting complex root keys around large-diameter bored piles, characterized in that it consists of an outer cylinder, an inner cylinder, a root key storage compartment, a guide chute, a double-threaded jack and a root key cover; a bottom plate is provided at the bottom of the outer cylinder, and eight root key outlets are provided on the upper part of the bottom plate, and a top plate is provided at the top of the outer cylinder; a hydraulic control line hole is provided on the top plate, and eight symmetrically arranged annular limit grooves are provided on the bottom plate, and chute and chute bases are provided on both sides of the limit groove, and a U-shaped buffer pad is provided between the chute on both sides, so as to limit the prefabricated root key to the central part, and a baffle is provided on the outer side of the limit groove in the length direction, so as to limit the root key cover inside the outer cylinder; the outer cylinder is connected to the surface reaction force system through a standard lifting pipe joint; a bottom notch is provided at the bottom of the inner cylinder to match the root key cover, a top flange plate is provided on the top, and a matching outer cylinder is provided in the middle part. Hydraulic control line hole, the inner cylinder is connected to the top plate of the outer cylinder through the top flange plate; the root key storage cabin is arranged above the root key outlet, and the root key storage cabin is provided with a spacer base on both sides of the bottom, and a T-shaped slot is provided inside the spacer base, and a rubber layer is provided on the inner side wall of the cabin along the height direction; the guide slide grooves are evenly arranged on the outside of the outer cylinder and match the sliding steel bars on the steel cage frame; the double-threaded jack is fixed in the center of the bottom plate of the outer cylinder, and the hydraulic support rod is controlled by the control line to advance and retract, and the end of the jack hydraulic support rod is provided with a root key cover, which can pass through the notch at the bottom of the inner cylinder and the root key outlet of the outer cylinder in turn; the root key cover is a square cavity cover that wraps the prefabricated root key, and its four outer corners are chamfered, and a smooth slide strip is provided on the bottom, and the position corresponds to the slide groove in the limit groove; a support bracket is provided on the top; the support bracket includes an enlarged sliding end, a connecting plate and an arc bracket.

[0007] Preferably, the length range of the limiting groove is between the outer cylinder and the inner cylinder.

[0008] Preferably, the number of root key outlets is the same as the number of jack hydraulic support rods; the limiting grooves, root key storage compartments, outer cylinder root key outlets, inner cylinder bottom notches, and jack root key cover movement directions match.

[0009] Preferably, the length of the standard lifting pipe section matches the height of the prefabricated root key, and is connected by end flange bolts, so that the elevation of the prefabricated root key jacking position is accurately controlled according to the standard lifting pipe section.

[0010] Preferably, the double-thread jack is provided with eight hydraulic support rods, which are divided into No. 1 thread jack support rod and No. 2 thread jack support rod according to intervals, and the advancement and retraction of No. 1 thread jack support rod and No. 2 thread jack support rod are independent of each other in the working state, thereby forming a root key that is dislocated up and down on the cast-in-place pile.

[0011] Preferably, after the prefabricated root key is pushed in, the superposition cavity is located in the area between the cast-in-place pile hole and the steel cage; the prefabricated root key superposition cavity can form an interlocking whole with the post-cast concrete.

[0012] Preferably, the root key cover and the top support bracket move with the jack hydraulic support rod to support the upper prefabricated root key during the jacking process; during the retraction of the hydraulic support rod, the upper prefabricated root key falls to the U-shaped buffer pad of the bottom plate limit groove, and the upper prefabricated root key is supported under the next hydraulic action.

[0013] Preferably, the smooth sliding strip at the bottom of the root key cover moves on the sliding groove in the limiting groove, and the enlarged sliding end of the top support bracket moves in the T-shaped groove of the spacing base.

[0014] Preferably, a large diameter root key cast-in-place pile construction method using a complex root key implantation device comprises the following steps.

[0015] S1. Drilling of bored pile holes: Drill bored pile holes according to the plan and clean the holes.

[0016] S2. Production of prefabricated root keys: Prefabricated root keys are produced in the factory and cured, and then transported to the site after reaching the required strength.

[0017] S3. Assemble the root key jacking implantation device.

[0018] S3.1. Make a bottom plate and open a limit groove. Install a slide in the limit groove and install a U-shaped buffer pad in the middle of the slide.

[0019] S3.2. Fix the double-threaded jack and root key cover on the base plate. The direction of the jack's hydraulic support rod coincides with the limit groove. The smooth sliding strip of the root key cover is clamped with the sliding groove in the limit groove. The expanded sliding end of the top support bracket is clamped with the T-slot of the spacer base. The non-bottom notch of the inner cylinder is fixed to the base plate through welding.

[0020] S3.3. Fix the vertical root key storage compartment with a rubber layer on the inner side that matches the size of the prefabricated root key to the inner cylinder, fix the outer cylinder to the bottom plate, and ensure that the root key outlet of the outer cylinder coincides with the limiting groove.

[0021] S4. Installation of prefabricated root keys: Place the specified number of prefabricated root keys in the eight root key storage compartments in sequence, fix the top plate above the outer cylinder and the inner cylinder, and pass the double-threaded jack control line through the hydraulic control line hole.

[0022] S5. Construction of steel cage: Make the cast-in-place pile steel cage according to the plan, symmetrically weld four vertical sliding steel bars on the inside of the steel cage, and lower the steel cage to the bottom of the cast-in-place pile hole.

[0023] S6. Lowering the root key jacking and implanting device: hoist the root key jacking and implanting device, and align the outer cylinder guide groove with the steel bars of the steel cage slide body one by one, and control the lowering position of the root key jacking and implanting device through the hoisting device.

[0024] S7. Construction of reaction force system: Install the reaction force system consisting of the bottom centering positioning frame, positioning base and upper reaction force frame on the ground, and connect it to the outer cylinder into a whole by extending the standard lifting pipe section.

[0025] S8. Root key jacking construction.

[0026] S8.1. Hydraulically jack the prefabricated root key into the bored pile hole using a standard lifting pipe joint to control the root key placement device. Once the designed elevation is reached, hydraulically jack the prefabricated root key into the bored pile hole.

[0027] S8.2. Use the control line to hydraulically push the No. 1 thread jack rod into the soil surrounding the pile. After pushing to the designed length, retract the hydraulic rod, moving the support bracket inward, causing the upper precast root key to fall. Then, push the hydraulic rod outward 1 to 3 cm to secure the precast root key with the root key cover.

[0028] S8.3. Control the key jacking and implantation device upward by lifting the standard lifting pipe section to reach the next key jacking elevation.

[0029] S8.4. Use the control line to hydraulically push the No. 2 thread jack rod to push the designated precast root key into the soil around the pile. After pushing to the designed length, retract the hydraulic rod, moving the support bracket inward, causing the upper precast root key to fall. Then, push the hydraulic rod outward 1 to 3 cm to secure the precast root key with the root key cover.

[0030] S8.5. Use the No. 1 thread jack rod and the No. 2 thread jack rod to lift evenly and jack the prefabricated root key in an interval jacking manner until the designed elevation of the bored pile is reached, and then hoist out the root key jacking implantation device.

[0031] S9. Concrete pouring: Concrete is poured into the pile hole through the guide tube to form a large-diameter root key pile.

[0032] The technical solution of the present invention has the following beneficial effects compared with the traditional technology:

[0033] 1. A root key storage compartment is set inside the root key pushing device. The pushing device only needs to be lowered into the bored pile hole once. This can solve the problems of the traditional root key which requires pulling the pushing device out of the hole to place the root key and then lowering it to the designated position for pushing construction. The problems include long construction period, low construction accuracy, and easy shrinkage and collapse.

[0034] 2. A symmetrical eight-way jack is installed inside the complex root key jacking and implantation device, which can achieve upper and lower layer dislocation jacking under the action of a double-thread control line; thereby forming a dislocated root key, further improving the pull-out resistance and bearing capacity of the root key cast-in-place pile.

[0035] 3. The root key push position is controlled by the standard lifting height of the lifting pipe section and the positioning device on the steel cage, ensuring the accurate installation and positioning of the root key.

[0036] 4. An inner cylinder and a hydraulic jack are set inside the complex root key jacking implantation device, and are fixedly connected to the ground reaction frame through a standard lifting pipe joint, which can ensure reliable jacking during the hydraulic jacking process.

[0037] 5. The two ends of the prefabricated root key are respectively a pointed head and a guiding bottom, which can enable the prefabricated root key to be discharged from the root key outlet of the complex root key jacking and implantation device and effectively inserted into the soil around the pile; and the root key body is provided with a superimposed cavity and reserved reinforcement, which can be effectively combined with the pile body after the cast-in-place pile concrete is poured to ensure the position of the root key.

[0038] 6. A spacer base is provided at the bottom of the root key storage compartment of the complex root key jacking implantation device, which effectively supports the upper prefabricated root key during the jacking process of the prefabricated root key without affecting the jacking construction of the lower prefabricated root key. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of a large-diameter cast-in-place pile with a complex root key jacking device before jacking.

[0040] Figure 2 This is a schematic diagram of a large diameter cast-in-place pile with a complex root key jacking device after jacking.

[0041] Figure 3 This is a cross-sectional view of the large diameter cast-in-place pile with complex root key jacking device before jacking ( Figure 1 Middle AA section);

[0042] Figure 4 This is a cross-sectional view of the large diameter cast-in-place pile with complex root key jacking device after jacking ( Figure 2 Middle BB section);

[0043] Figure 5 This is a cross-sectional view of the root key outlet before the large diameter cast-in-place pile with complex root key jacking and implantation device is jacked in. Figure 1 Middle 1-1 section);

[0044] Figure 6 This is the cross-sectional view of the bottom plate of the outer cylinder ( Figure 1 Middle 2-2 section);

[0045] Figure 7 This is a cross-sectional view of the tip of the prefabricated root key in the root key storage compartment before jacking ( Figure 1 Middle 3-3 section);

[0046] Figure 8 This is the cross-section of the reserved reinforcement of the prefabricated root key superposition cavity in the root key storage compartment before jacking ( Figure 1 Middle 4-4 section);

[0047] Figure 9 This is the cross-sectional view of the bottom of the prefabricated root key guide in the root key storage compartment after jacking ( Figure 2 Middle 5-5 section);

[0048] Figure 10 is a schematic diagram of the bottom plate of the outer cylinder;

[0049] Figure 11 It is a three-dimensional schematic diagram of the bottom plate of the outer cylinder;

[0050] Figure 12 It is a top view of the bottom plate of the outer cylinder;

[0051] Figure 13 This is a cross-sectional diagram of the root key outlet ( Figure 6 Middle 6-6 section);

[0052] Figure 14 This is the cross-sectional view of the bottom plate baffle of the outer cylinder ( Figure 12 Section 7-7);

[0053] Figure 15 This is the cross-sectional view of the limiting groove of the outer cylinder bottom plate ( Figure 12 Middle 8-8 section);

[0054] Figure 16 Schematic diagram of the outer cylinder structure;

[0055] Figure 17 It is a schematic diagram of the inner cylinder structure;

[0056] Figure 18 It is a cross-sectional view of the inner cylinder;

[0057] Figure 19 This is a schematic diagram of the connection between the inner cylinder and the bottom plate (limiting groove cross section);

[0058] Figure 20 This is a schematic diagram of the connection between the inner cylinder and the bottom plate (non-limiting groove section);

[0059] Figure 21 Schematic diagram of the root key cover structure;

[0060] Figure 22 is a schematic cross-sectional view of a root key cover;

[0061] Figure 23 It is a schematic diagram of the cross section of the prefabricated root key;

[0062] Figure 24 This is the cross-sectional view of the tip of the prefabricated root key ( Figure 23 Middle 9-9 section);

[0063] Figure 25 This is the cross-section of the prefabricated root key body ( Figure 23 Middle 10-10 section);

[0064] Figure 26 This is the bottom cross-section of the prefabricated root key guide ( Figure 23 Section 11-11);

[0065] Figure 27 is a schematic diagram of bored pile drilling (step S1);

[0066] Figure 28 is a schematic diagram of the root key push-in implant device after being lowered (step S6);

[0067] Figure 29 is a schematic diagram of the jacking construction of the root key jacking implantation device (step S8);

[0068] Figure 30 Schematic diagram of the construction of the No. 1 thread jack rod jacking the prefabricated root key (step S8);

[0069] Figure 31 Schematic diagram of the construction of the second thread jack rod jacking the prefabricated root key (step S8);

[0070] Figure 32 Schematic diagram of the large-diameter root key cast-in-place pile structure in the embodiment (step S9);

[0071] Figure 33 This is a construction flow chart for a large-diameter root key cast-in-place pile construction method using a complex root key implantation device.

[0072] Markings in the figure: 1-outer cylinder, 101-key outlet, 2-top plate, 201-hydraulic control line hole, 3-bottom plate, 301-limiting groove, 302-U-shaped buffer pad, 303-chute, 304-chute base, 305-baffle, 4-key storage compartment, 401-rubber layer, 402-side wall, 403-spacer base, 404-T-slot, 5-guide chute, 6-key cover, 601-chamfer, 602-smooth slide, 603-support bracket, 6031-enlarged sliding end, 6032-connecting plate, 6033-arc bracket, 7-inner cylinder, 701-bottom notch, 702-top flange plate , 8-standard lifting pipe section, 801-flange, 9-bolt, 10-double-thread jack, 1001-control line, 1002-hydraulic support rod, 1003-, 11-rebar cage, 1101-sliding body steel bar, 12-prefabricated root key, 1201-tip head, 1202-root key body, 1203-superimposed cavity, 1204-reserved reinforcement, 1205-guide bottom, 13-cast-in-place pile hole, 14-reaction system, 1401-centering positioning frame, 1402-positioning base, 1403-reaction frame, 15-soil layer, 1501-root key soil layer, 1502-non-root key soil layer, 16-ground surface, 17-weld. DETAILED DESCRIPTION

[0073] In order to deepen the understanding of the present invention, the following reference will be made to Figures 1 to 33 , the embodiments of the present invention are described in detail. The following embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation methods are given, but the protection scope of the present invention is not limited to the following embodiments.

[0074] In this embodiment, the bored pile hole 13 is 15m long and 1.6m in diameter. The height difference between the upper and lower root keys is 0.5m, and there are 4 prefabricated root keys 12 in each layer. A root key jacking and implanting device is made according to the size of the root key bored pile, wherein the outer cylinder 1 has a diameter of 1.5m, the inner cylinder 7 has a diameter of 0.7m, and the height is 10m. Ten prefabricated root keys 12 are placed in each root key storage compartment 4. The prefabricated root key 12 is 0.35m long, and the root key extends 0.25m out of the outside of the bored pile hole 13. The diameter of the standard lifting pipe section 8 is 0.7m, and the height of each section is 1.0m. Two root key jacking constructions are performed for each lifting.

[0075] Combined with attachment Figure 1 , Attachment Figure 2 As shown, a root key jacking and implanting device for a large-diameter cast-in-place pile with a complex periphery is composed of an outer cylinder 1, an inner cylinder 7, a root key storage compartment 4, a guide chute 5, a double-threaded jack 10 and a root key cover 6.

[0076] Combined with attachment Figure 10 , Attachment Figure 13 , Attachment Figure 14 , Attachment Figure 16 As shown, the bottom of the outer cylinder 1 is provided with a bottom plate 3, and eight root key outlets 101 are provided on the upper part of the bottom plate 3. The top of the outer cylinder 1 is provided with a top plate 2; the top plate 2 is provided with a hydraulic control line hole 201, and then combined with the attached Figure 10 ~Attached Figure 12 As shown, eight symmetrically arranged annular limiting grooves 301 are provided on the bottom plate 3, and sliding grooves 303 and sliding groove bases 304 are provided on both sides of the limiting grooves 301. A U-shaped buffer pad 302 is provided between the sliding grooves 303 on both sides, thereby limiting the prefabricated root key 12 to the central part; Figure 15 As shown, a baffle 305 is provided on the outside of the limiting groove 301 in the length direction, thereby limiting the root key cover 6 inside the outer cylinder 1; the outer cylinder 1 is connected to the reaction system 14 of the ground surface 16 through a standard lifting pipe section 8.

[0077] Combined with attachment Figure 17 , Attachment Figure 18 , Attachment Figure 19 , Attachment Figure 20 As shown, the bottom of the inner cylinder 7 is provided with a bottom notch 701 that matches the root key cover 6, the top is provided with a top flange plate 702, and a hydraulic control line hole 201 that matches the outer cylinder 1 is provided in the middle part. The inner cylinder 7 is connected to the top plate 2 of the outer cylinder 1 through the top flange plate 702.

[0078] Combined with attachment Figure 7 ~Attached Figure 9 As shown, the root key storage cabin 4 is arranged above the root key outlet 101, and a spacing base 403 is provided on both sides of the bottom of the root key storage cabin 4, a T-shaped groove 404 is provided inside the spacing base 403, and a rubber layer 401 is provided on the side wall 402 inside the cabin along the height direction; Figure 2 As shown, the root key cover 6 and the top support bracket 603 move with the jack hydraulic support rod 1002, supporting the upper prefabricated root key 12 during the jacking process; during the retraction of the hydraulic support rod 1002, the upper prefabricated root key 12 falls to the U-shaped buffer pad 302 of the limiting groove 301 of the base plate 3, and supports the upper prefabricated root key 12 under the next hydraulic action; the smooth slide 602 at the bottom of the root key cover 6 moves on the slide groove 303 in the limiting groove 301, and the enlarged sliding end 6031 of the top support bracket 603 moves in the T-shaped groove 404 of the spacing base 403.

[0079] Combined with attachment Figure 3 ~Attached Figure 6 As shown, the guide chutes 5 are evenly arranged on the outside of the outer cylinder 1 and match the sliding body steel bars 1101 on the steel cage 11 skeleton.

[0080] Combined with attachment Figure 4 , Attachment Figure 5 As shown, the double-threaded jack 10 is fixed to the center of the bottom plate 3 of the outer cylinder 1, and the hydraulic support rod 1002 is controlled to advance and retract by the control line 1001. The end of the jack hydraulic support rod 1002 is provided with a key cover 6, and can pass through the bottom notch 701 of the inner cylinder 7 and the key outlet 101 of the outer cylinder 1 in sequence; the number of the key outlets 101 is the same as the number of the jack hydraulic support rod 1002; the limiting groove 301, the key storage compartment 4, the key outlet 101 of the outer cylinder 1, the bottom notch 701 of the inner cylinder 7, and the moving direction of the jack key cover 6 match each other; and then combined with the attached Figure 30 , Attachment Figure 31 As shown, the double-thread jack 10 is provided with eight hydraulic support rods 1002, which are divided into No. 1 thread jack support rods and No. 2 thread jack support rods according to intervals, and the advancement and retraction of the No. 1 thread jack support rods and the No. 2 thread jack support rods are independent of each other in the working state, thereby forming a root key that is dislocated up and down on the cast-in-place pile.

[0081] Combined with attachment Figure 21 , Attachment Figure 22 As shown, the root key cover 6 is a square cavity cover that wraps the prefabricated root key 12. Its four outer corners are provided with chamfers 601, and a smooth sliding strip 602 is provided at the bottom, the position of which corresponds to the sliding groove 303 in the limiting groove 301; a supporting bracket 603 is provided on the top; the supporting bracket 603 includes an enlarged sliding end 6031, a connecting plate 6032 and an arc-shaped bracket 6033.

[0082] Combined with attachment Figure 11 , Attachment Figure 12 As shown, the length of the limiting groove 301 is between the outer cylinder 1 and the inner cylinder 7.

[0083] Combined with attachment Figure 28 , Attachment Figure 29 As shown, the length of the standard lifting pipe segment 8 matches the height of the prefabricated root key 12, and is connected through the end flange 801 and bolts 9. The elevation of the jacking position of the prefabricated root key 12 is accurately controlled according to the standard lifting pipe segment 8; the reaction force system 14 includes a bottom centering positioning frame 1401, a positioning base 1402 and an upper reaction force frame 1403, and the positions of the outer cylinder 1 and the inner cylinder 7 are controlled by lifting the standard lifting pipe segment 8 section by section.

[0084] Combined with attachment Figure 23 ~Attached Figure 26 As shown, 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. A small-diameter cylindrical overlapping cavity 1203 is provided in the middle of the root key body 1202, and a reserved reinforcement 1204 is provided to form an interlocking whole with the post-cast concrete. Figure 4 As shown, after the prefabricated root key 12 is pushed in, the superimposed cavity 1203 is located in the area between the cast-in-place pile hole 13 and the steel cage 11.

[0085] In view of the above, combined with the Figure 33 The invention discloses a large diameter root key cast-in-place pile construction method using a complex root key implantation device, which includes the following steps.

[0086] S1, drilling cast-in-place pile hole 13: combined with the attached Figure 27 As shown, according to the plan, the bored pile hole 13 is drilled and cleaned.

[0087] S2, production of prefabricated root key 12: combined with the attached Figures 23-26 As shown, the prefabricated root key 12 includes a truncated cone-shaped pointed head 1201, a cylindrical root key body 1202 and a truncated cone-shaped guide bottom 1205, and a small-diameter cylindrical overlapping cavity 1203 is provided in the middle of the root key body 1202, and a reserved rib 1204 is provided; the prefabricated root key 12 is produced and cured in the factory, and is transported to the site after reaching the required strength.

[0088] S3. Assembling the root key jacking implantation device, including steps S3.1 to S3.3.

[0089] S3.1、Combined with attachment Figure 6 , Attachment Figure 10 As shown, a bottom plate 3 is manufactured, and a limiting groove 301 is provided. A slide groove 303 is installed in the limiting groove 301 , and a U-shaped buffer pad 302 is installed in the middle of the slide groove 303 .

[0090] S3.2, combined with the Figure 13 ~Attached Figure 15 As shown, the double-threaded jack 10 and the root key cover 6 are fixed on the base plate 3, the direction of the jack hydraulic support rod 1002 coincides with the limit groove 301, the smooth slide 602 of the root key cover 6 is clamped with the slide groove 303 in the limit groove 301, the enlarged sliding end 6031 of the top support bracket 603 is clamped with the T-shaped groove 404 of the spacer base 403, and the non-bottom notch 701 of the inner cylinder 7 is welded and fixed to the base plate 3 through the weld 17.

[0091] S3.3, combined with the Figure 19 , Attachment Figure 20 As shown, the vertical root key storage compartment 4 with a rubber layer 401 on the inner side that matches the size of the prefabricated root key 12 is fixedly connected to the inner cylinder 7, and the outer cylinder 1 is fixed on the bottom plate 3, and the root key outlet 101 of the outer cylinder 1 coincides with the limiting groove 301.

[0092] S4, Prefabricated root key 12 installation: Combine with the attached Figure 1 , Attachment Figure 2 , attached Figure 7 ~Attached Figure 9 , place the specified number of prefabricated root keys 12 in the eight root key storage compartments 4 in sequence, fix the top plate 2 above the outer cylinder 1 and the inner cylinder 7, and pass the double-threaded jack 10 control line 1001 through the hydraulic control line hole 201.

[0093] S5. Construction of the steel cage 11: The cast-in-place pile steel cage 11 is manufactured according to the plan, four vertical sliding steel bars 1101 are symmetrically welded inside the steel cage 11, and the steel cage 11 is lowered to the bottom of the cast-in-place pile hole 13.

[0094] S6. Lower the root key implant device: Combined with the attached Figure 28 As shown, the root key jacking implantation device is hoisted, and the guide chute 5 of the outer cylinder 1 is matched one by one with the sliding steel bars 1101 of the steel cage 11, and the lowering position of the root key jacking implantation device is controlled by the hoisting device.

[0095] S7, reaction system 14 construction: combined with the attached Figure 28 As shown, a reaction force system 14 consisting of a bottom centering positioning frame 1401, a positioning base 1402 and an upper reaction force frame 1403 is installed on the ground surface 16 and connected to the outer cylinder 1 into a whole by extending the standard lifting pipe section 8.

[0096] S8, root key jacking construction: combined with the attached Figure 29 ~Attached Figure 31 As shown, it includes steps S8.1 to S8.5.

[0097] S8.1. Control the root key jacking and implanting device at the elevation of the bored pile hole 13 by means of the standard lifting pipe section 8. After reaching the designed elevation, hydraulically jack the prefabricated root key 12.

[0098] S8.2. Use the control line 1001 to hydraulically push the No. 1 thread jack support rod to push the designated prefabricated root key 12 into the soil 15 around the pile; after pushing to the designed length, retract the hydraulic support rod 1002 to drive the support bracket 603 to move inward, so that the upper prefabricated root key 12 falls, and push it outward by 1 to 3 cm through the hydraulic support rod 1002, so that the root key cover 6 clamps the prefabricated root key 12.

[0099] S8.3. Control the key jacking and implanting device to move upward by lifting the standard lifting pipe section 8 to reach the next key jacking elevation.

[0100] S8.4. Use the control line 1001 to hydraulically push the No. 2 thread jack support rod to push the designated prefabricated root key 12 into the soil 15 around the pile; after pushing to the designed length, retract the hydraulic support rod 1002 to drive the support bracket 603 to move inward, so that the upper prefabricated root key 12 falls, and push it outward by 1 to 3 cm through the hydraulic support rod 1002, so that the root key cover 6 clamps the prefabricated root key 12.

[0101] S8.5. Use the No. 1 thread jack rod and the No. 2 thread jack rod to lift evenly and jack the prefabricated root key 12 at intervals until the designed elevation of the bored pile is reached, and then hoist out the root key jacking implantation device.

[0102] S9, concrete pouring: combined with the attached Figure 32 As shown, concrete is poured into the pile hole 13 through a guide tube, thereby forming a large-diameter root key pile.

[0103] The above embodiments are only used to illustrate the technical concept of the present invention, and are not intended to limit the rights protection of the present invention. Any non-substantial changes to the present invention using this concept should fall within the scope of protection of the present invention.

Claims

1. A complex root key implantation device, characterized in that: It consists of an outer cylinder (1), an inner cylinder (7), a root key storage compartment (4), a guide chute (5), a double-threaded jack (10) and a root key cover (6); The outer cylinder (1) is provided with a bottom plate (3) at the bottom, and eight root key outlets (101) are provided on the upper part of the bottom plate (3), and a top plate (2) is provided at the top of the outer cylinder (1); a hydraulic control line hole (201) is provided on the top plate (2), and eight symmetrically arranged annular limit grooves (301) are provided on the bottom plate (3), and the limit groove (301) has a length range between the outer cylinder (1) and the inner cylinder (7), and a slide groove (303) and a slide groove base (304) are provided on both sides of the limit groove (301), and a U-shaped buffer pad (302) is provided between the slide grooves (303) on both sides, thereby limiting the prefabricated root key (12) to the central part, and a baffle (305) is provided on the outer side of the limit groove (301) in the length direction, thereby limiting the root key cover (6) inside the outer cylinder (1); the outer cylinder (1) is connected to the ground surface (16) reaction force system (14) through a standard lifting pipe joint (8); The bottom of the inner cylinder (7) is provided with a bottom notch (701) matching the root key cover (6), the top is provided with a top flange plate (702), and the middle part is provided with a hydraulic control line hole (201) matching the outer cylinder (1). The inner cylinder (7) is connected to the top plate (2) of the outer cylinder (1) through the top flange plate (702); The root key storage compartment (4) is arranged above the root key outlet (101), and spacer bases (403) are provided on both sides of the bottom of the root key storage compartment (4), a T-shaped groove (404) is provided inside the spacer base (403), and a rubber layer (401) is provided on the inner side wall (402) of the compartment along the height direction; The guide chutes (5) are evenly arranged on the outside of the outer cylinder (1) and match the sliding steel bars (1101) on the steel cage (11) skeleton; The double-threaded jack (10) is fixed to the center of the bottom plate (3) of the outer cylinder (1). The double-threaded jack (10) is provided with eight hydraulic support rods (1002). The advancement and retraction of the hydraulic support rods (1002) are controlled by the control line (1001). The end of the jack hydraulic support rod (1002) is provided with a root key cover (6) and can pass through the bottom notch (701) of the inner cylinder (7) and the root key outlet (101) of the outer cylinder (1) in sequence. The hydraulic support rod (1002) is divided into a No. 1 thread jack support rod and a No. 2 thread jack support rod according to the interval, and the advancement and retraction of the No. 1 thread jack support rod and the No. 2 thread jack support rod are independent of each other in the working state, thereby forming a root key displaced up and down on the cast-in-place pile. The root key cover (6) is a square cavity cover that wraps the prefabricated root key (12), and its four outer corners are provided with chamfers (601), and a smooth sliding strip (602) is provided at the bottom, the position of which corresponds to the inner sliding groove (303) of the limiting groove (301); a supporting bracket (603) is provided on the top; the supporting bracket (603) includes an enlarged sliding end (6031), a connecting plate (6032) and an arc-shaped bracket (6033).

2. A complex root bond implantation device according to claim 1, characterized in that: The number of the root key outlets (101) is the same as the number of the jack hydraulic support rods (1002); the limiting grooves (301), the root key storage compartment (4), the root key outlets (101) of the outer cylinder (1), the bottom notch (701) of the inner cylinder (7), and the moving directions of the jack root key cover (6) are matched.

3. A complex root bond implantation device according to claim 1, characterized in that: The length of the standard lifting pipe section (8) matches the height of the prefabricated root key (12), and is connected through the end flange (801) bolts (9), and the elevation of the prefabricated root key (12) is accurately controlled according to the standard lifting pipe section (8).

4. A complex root bond implantation device according to claim 1, characterized in that: After the prefabricated root key (12) is pushed in, the superimposed cavity (1203) on the prefabricated root key (12) is located in the area between the cast-in-place pile hole (13) and the steel cage (11); the superimposed cavity (1203) can form an interlocking whole with the post-cast concrete.

5. A complex root bond implantation device according to claim 1, characterized in that: The root key cover (6) and the top support bracket (603) move with the jack hydraulic support rod (1002), supporting the upper prefabricated root key (12) during the jacking process; during the retraction process of the hydraulic support rod (1002), the upper prefabricated root key (12) falls to the U-shaped buffer pad (302) of the limiting groove (301) of the bottom plate (3), and supports the upper prefabricated root key (12) under the next hydraulic action.

6. A complex root bond implantation device according to claim 1, characterized in that: The smooth sliding strip (602) at the bottom of the root key cover (6) moves on the inner sliding groove (303) of 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).

7. A method for constructing large-diameter root key cast-in-place piles using the complex root key implantation device according to any one of claims 1 to 6, characterized in that: It includes the following steps: S1, drilling and setting cast-in-place pile holes (13): drilling and setting cast-in-place pile holes (13) according to the plan, and cleaning the holes; S2. Production of prefabricated root keys (12): The prefabricated root keys (12) are produced in a factory and cured, and transported to the site after reaching the required strength; S3. Assembly of the root key jacking implantation device: S3.1, making a bottom plate (3), and opening a limit groove (301), installing a slide groove (303) in the limit groove (301), and installing a U-shaped buffer pad (302) in the middle of the slide groove (303); S3.2, fix the double-threaded jack (10) and the root key cover (6) on the bottom plate (3), the direction of the jack hydraulic support rod (1002) coincides with the limit groove (301), the smooth slide (602) of the root key cover (6) is clamped with the slide groove (303) in the limit groove (301), the enlarged sliding end (6031) of the top support bracket (603) is clamped with the T-slot (404) of the spacer base (403), and the non-bottom notch (701) of the inner cylinder (7) is welded and fixed to the bottom plate (3) through the weld (17); S3.

3. The vertical root key storage compartment (4) with a rubber layer (401) on the inner side that matches the size of the prefabricated root key (12) is fixedly connected to the inner cylinder (7), and the outer cylinder (1) is fixed to the bottom plate (3), and the root key outlet (101) of the outer cylinder (1) is overlapped with the limiting groove (301); S4. Installation of prefabricated root keys (12): Place a specified number of prefabricated root keys (12) in the eight root key storage compartments (4) in sequence, fix the top plate (2) above the outer cylinder (1) and the inner cylinder (7), and pass the control line (1001) of the double-threaded jack (10) through the hydraulic control line hole (201); S5, construction of the steel cage (11): a cast-in-place pile steel cage (11) is manufactured according to the plan, four vertically arranged sliding steel bars (1101) are symmetrically welded inside the steel cage (11), and the steel cage (11) is lowered to the bottom of the cast-in-place pile hole (13); S6. Lowering the root key jacking implantation device: hoist the root key jacking implantation device, and align the guide chute (5) of the outer cylinder (1) with the sliding body steel bar (1101) of the steel cage (11) one by one, and control the lowering position of the root key jacking implantation device through the hoisting device; S7, construction of the reaction force system (14): installing the reaction force system (14) consisting of a bottom centering positioning frame (1401), a positioning base (1402) and an upper reaction force frame (1403) on the ground surface (16), and connecting it to the outer cylinder (1) by extending the standard lifting pipe section (8); S8, root key jacking construction: S8.

1. Control the elevation of the root key jacking device in the bored pile hole (13) by means of a standard lifting pipe section (8). After reaching the designed elevation, hydraulically jack the prefabricated root key (12); S8.2, hydraulically push the No. 1 thread jack support rod through the control line (1001) to push the designated prefabricated root key (12) into the soil (15) around the pile; after pushing to the designed length, retract the hydraulic support rod (1002) to drive the support bracket (603) to move inward, thereby causing the upper prefabricated root key (12) to fall, and push the hydraulic support rod (1002) outward by 1 to 3 cm to allow the root key cover (6) to clamp the prefabricated root key (12); S8.3, by lifting the standard lifting pipe section (8), the root key jacking implantation device is controlled to move upward to reach the next key jacking elevation; S8.

4. The second thread jack support rod is hydraulically pushed through the control line (1001) to push the designated prefabricated root key (12) into the soil (15) around the pile; after pushing to the designed length, the hydraulic support rod (1002) is retracted to drive the support bracket (603) to move inward, thereby causing the upper prefabricated root key (12) to fall, and the hydraulic support rod (1002) is pushed outward by 1 to 3 cm to allow the root key cover (6) to clamp the prefabricated root key (12); S8.5, lift the prefabricated root key (12) evenly with the No. 1 thread jack rod and the No. 2 thread jack rod, and push the prefabricated root key (12) in an interval jacking manner until the designed elevation of the cast-in-place pile is reached, and then lift out the root key jacking implantation device; S9, concrete pouring: pouring concrete into the pile hole (13) through the guide tube, thereby forming a large diameter root key pile.

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