A construction method for a pull-out resistant prefabricated hollow pipe pile and foundation connection structure

Abstract

The invention discloses a construction method for a pull-out resistant prefabricated hollow pipe pile and foundation connection structure, comprising: a prefabricated hollow pipe pile (3) pre-buried under the foundation, a pull-out resistant rod (501); a steel bar stripping device, comprising: a base (1) placed above the ground, a stripping unit (230); a pipe pile self-rotation drive unit (4), comprising a self-rotation drive motor (406), a second self-rotation drive gear (405), a first self-rotation drive gear (404), and a rolling friction wheel (401). By proposing an auxiliary construction device that can perform steel bar stripping on the prefabricated hollow pipe pile in advance, the connection difficulty after the threaded section is completely cut off is further solved. During construction, the construction personnel only need to perform plane sawing on the prefabricated hollow pipe pile according to the construction length requirements, and then put the pipe pile into the steel bar stripping device to strip out the steel bar section in the end concrete separately.

Description

Technical Field

[0001] The invention belongs to the technical field of pull-out pile construction, and more specifically, relates to a construction method of a pull-out prefabricated hollow pipe pile and a foundation connection structure. Background Art

[0002] With the development of the construction industry, in order to meet the demand for more underground space, designs with basements are now mostly used. When the calculated overall anti-floating or local anti-floating of the foundation does not meet the calculation requirements, it is necessary to solve the anti-floating problem by designing pull-out piles. Prefabricated hollow pipe piles are increasingly used in engineering design due to their construction and cost advantages. As a common anti-floating measure, pull-out prefabricated hollow pipe piles rely on the friction between the pile body and the soil layer to resist the axial tension. The piles are prefabricated piles and the foundation is a cast-in-place structure. Therefore, the connection performance between the pull-out prefabricated hollow pipe piles and the foundation will directly affect whether the actual pull-out resistance can meet the design requirements. In order to meet the requirements of the reserved tensioning mechanical connection sleeve, pile connection and pile cutting occur during construction, resulting in complex and difficult subsequent construction processes. Therefore, it is of great significance to propose a construction method that saves too many difficult construction steps when facing the problems of pile connection and pile cutting.

[0003] In order to solve the above problems, Chinese utility model patent CN203270554U discloses a pipe pile joint and a pipe pile foundation, the pipe pile joint includes a pipe pile, core-filled concrete, core-filled concrete reinforcement and welded reinforcement, the core-filled concrete is formed on the inner wall of the pipe pile, the core-filled concrete reinforcement is partially buried in the core-filled concrete and partially protrudes above the top of the pipe pile, and the welded reinforcement is partially welded to the side of the pipe pile and partially protrudes above the top of the pipe pile. The pipe pile foundation includes a cap and the above-mentioned pipe pile joint, and the part of the core-filled concrete reinforcement that is higher than the top of the pipe pile and the part of the welded reinforcement that is higher than the top of the pipe pile are respectively welded to the cap; in addition, Chinese invention patent CN106320327A discloses an anti-pullout pipe pile and a method for connecting it to a foundation bottom plate, which is characterized in that a plurality of sleeves connected to anchor steel bar threads are provided on the pile head of the concrete pipe pile, and the anchor steel bar is pre-embedded in the concrete pipe pile after being connected by the internal thread of the sleeve; the concrete pipe pile is connected to the anti-pullout steel bar threads of the sleeve and the foundation bottom plate to form an anti-pullout pipe pile foundation.

[0004] The above patented technology improves the anti-pullout effect by setting an anti-pullout auxiliary structure in the heart of the prefabricated hollow pipe pile, but there are still the following technical problems:

[0005] (1) If the threaded connection section of the pipe wall reinforcement of the prefabricated hollow pipe pile needs to be completely cut off according to the construction length requirements, it will be impossible to directly position and connect the extended reinforcement through the threaded section, which will cause great trouble for the extension connection of the pipe wall reinforcement in the subsequent construction process;

[0006] (2) Existing technical means require that the extension section be fixedly connected to the pipe wall reinforcement by welding. However, if the prefabricated hollow pipe pile is plane sawed, it is impossible to directly obtain the welding section where the pipe wall reinforcement extends, resulting in a smaller welding contact surface, which in turn affects the pull-out strength.

[0007] (3) To propose an effective method for stripping the pipe wall reinforcement, so that after the pipe wall thread section is completely cut off, a certain length of pipe wall reinforcement can be easily stripped out for connection. Summary of the invention

[0008] In view of the above defects or improvement needs of the prior art, the present invention provides a construction method for a pull-out resistant prefabricated hollow pipe pile and a foundation connection structure. In an embodiment of the present invention, a connection structure composed of a concrete core and a pull-out rod is provided inside the prefabricated hollow pipe pile to effectively improve the overall pull-out strength of the pull-out resistant pile. At the same time, the technical problem that it is difficult to extend the steel bar after the threaded section of the pipe wall steel bar is completely cut off is solved to a certain extent. In addition, an auxiliary construction device that can perform steel bar stripping treatment on the prefabricated hollow pipe pile in advance is proposed, which further solves the connection difficulties after the threaded section is completely cut off. During construction, the construction personnel only need to saw the prefabricated hollow pipe pile in a plane according to the construction length requirements, and then put the pipe pile into the steel bar stripping device to strip out the steel bar section in the end concrete separately, which greatly enhances the connection contact area between the extended steel bar and the pipe wall steel bar in the subsequent construction process, thereby effectively improving the overall pull-out strength. Including:

[0009] Precast hollow pipe piles embedded under the foundation, installed and poured into the concrete core of the precast hollow pipe piles, and anti-pullout rods set at the center of the concrete core;

[0010] A steel bar stripping device for pre-stripping the end of a prefabricated hollow pipe pile, comprising: a base placed above the ground, an execution slide groove arranged at the front section of the base; a stripping platform slidably connected to the execution slide groove, and a linear drive mechanism arranged below the stripping platform; a claw structure arranged above the stripping platform for clamping into the wall of the prefabricated hollow pipe pile, a first linear motor horizontally fixed in the claw structure, a stripping unit fixedly connected to the output end of the first linear motor and in direct contact with the prefabricated hollow pipe pile for stripping out the steel bars inside the prefabricated hollow pipe pile; a pipe pile self-rotation drive unit for supporting and driving the prefabricated hollow pipe pile to rotate axially, comprising a self-rotation drive motor fixedly connected to the base, a second self-rotation drive gear fixedly connected to the output shaft of the self-rotation drive motor, a first self-rotation drive gear meshing with the second self-rotation drive gear, a rolling friction axially fixedly connected to the first self-rotation drive gear through a transmission shaft, a positioning support fixedly connected to the pipe pile support end at one end of the base, and a driven rolling wheel rotationally connected to the positioning support through a transmission shaft.

[0011] Preferably, the anti-pullout rod comprises:

[0012] Anti-pullout rod pipe wall reinforcement is provided at the upper end.

[0013] Preferably, the anti-pullout rod is reinforced and connected to the inner wall of the prefabricated hollow pipe pile via an anchoring mechanism.

[0014] Preferably, a support column is provided below the base.

[0015] Preferably, the linear drive mechanism comprises:

[0016] A first rack portion fixedly disposed at the bottom of the peeling table;

[0017] A slide drive gear disposed below the execution slide slot and rotatably connected to the base;

[0018] The motor that drives the slide drive gear to rotate.

[0019] Preferably, the stripping unit comprises:

[0020] A positioning vertical plate fixedly connected to the output end of the first linear motor;

[0021] A base plate detachably connected to the positioning vertical plate via a snap-on unit;

[0022] Metal sensors are arranged at the lower left and upper right sides of the substrate to monitor the exposed state of the steel bar filling layer;

[0023] A grinding unit is arranged at the upper left and lower right of the side of the base plate for removing the outer filling layer of concrete and the inner filling layer of concrete, comprising: a guide block fixedly connected to the side of the base plate, a sliding block slidably connected to the guide block through an extended part, and a grinding head arranged at the extended end of the sliding block;

[0024] A punch assembly is used for punching out the thin cement layer remaining between adjacent steel bars in a steel bar filling layer.

[0025] Preferably, the card connection unit comprises:

[0026] A clamping head entrance and a clamping slot are arranged near the upper and lower ends of the positioning vertical plate, installation slots are arranged at the upper and lower ends of the base plate, and a clamping installation block is loaded into the clamping head entrance and clamped to the clamping slot, the second clamping head portion of the clamping installation block is fixedly connected to the clamping slot by a positioning bolt, and the first clamping head portion of the clamping installation block is clamped to the installation slot.

[0027] Preferably, the recessed claw structure further includes:

[0028] Both upper and lower sides are provided with guide shafts which are slidably connected with guide connection grooves arranged near the upper and lower ends of the positioning vertical plate for motion guidance.

[0029] Preferably, the punch assembly comprises:

[0030] A second linear motor, a horizontal sliding rod fixedly connected to the output shaft thereof, and double-sided racks arranged on the upper and lower sides of the horizontal sliding rod;

[0031] A lower gear meshingly connected to the lower rack of the double-sided racks, an impulse worm axially fixedly connected to the lower gear via a transmission shaft, an impulse worm wheel meshingly connected to the impulse worm, and an impulse driving gear axially connected to the impulse worm wheel via a transmission shaft and linearly driven by the second rack portion;

[0032] An upper gear meshing and transmission connected to the upper rack in the double-sided racks, an active bevel gear axially fixedly connected to the upper gear through a transmission shaft, a driven bevel gear meshing and transmission with the active bevel gear, a cutter head driving gear axially fixedly connected to the driven bevel gear through the transmission shaft, and a punching cutter head provided with a cutter head rack portion meshing and transmission with the cutter head driving gear below.

[0033] A construction method for a pull-out resistant prefabricated hollow pipe pile and foundation connection structure, comprising:

[0034] S100: First, the total length of the required pull-out piles is calculated, thereby calculating the number of prefabricated hollow pipe piles 3 required, and calculating the length of the prefabricated hollow pipe piles located at the top that needs to be cut off;

[0035] S200: Perform manual sawing to cut off the prefabricated hollow pipe pile according to the calculated position;

[0036] S300: placing the sawn prefabricated hollow pipe pile in a steel stripping device, and keeping it in direct contact with the rolling friction wheel and the driven rolling wheel, and installing one end of the sawn surface into the claw structure, controlling the linear drive mechanism to make the stripping table move forward, and then controlling the first linear motor to extend until the wall of the prefabricated hollow pipe pile penetrates into the stripping unit, and then starting the stripping unit and the self-rotating drive motor. Driven by the self-rotating drive motor, the second self-rotating drive gear rotates, thereby driving the first self-rotating drive gear to rotate, and then driving the rolling friction wheel to rotate. Under the action of friction, the prefabricated hollow pipe pile rotates accordingly. At the same time, the stripping unit grinds the concrete inner filling layer and the concrete outer filling layer of the prefabricated hollow pipe pile, and punches the concrete section between adjacent steel bars in the steel bar filling layer, thereby completing the stripping operation of the end steel bars.

[0037] S400: Install the stripped prefabricated hollow pipe piles under the foundation, install anti-pullout rods in the inner core, and establish a firm connection with the inner wall of the hollow pipe pile through an anchor mechanism, and pour concrete at the same time;

[0038] S500: The extended steel bar is fixedly connected to the steel bar segment stripped from the upper end of the prefabricated hollow pipe pile by welding, thereby completing the installation of the prefabricated hollow pipe pile;

[0039] S600: Construct the foundation to complete the entire construction process.

[0040] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0041] 1. The construction method of the pull-out resistant prefabricated hollow pipe pile and foundation connection structure of the present invention effectively improves the overall pull-out strength of the pull-out resistant pile by arranging a connection structure composed of a concrete core and a pull-out rod inside the prefabricated hollow pipe pile. At the same time, the technical problem that it is difficult to extend the steel bar after the threaded section of the pipe wall steel bar is completely cut off is solved to a certain extent; in addition, an auxiliary construction device that can perform steel bar stripping treatment on the prefabricated hollow pipe pile in advance is proposed, which further solves the connection difficulty after the threaded section is completely cut off. During construction, the construction personnel only need to perform plane sawing on the prefabricated hollow pipe pile according to the construction length requirements, and then put the pipe pile into the steel bar stripping device to strip off the steel bar section in the end concrete separately, which greatly enhances the connection contact area between the extended steel bar and the pipe wall steel bar in the subsequent construction process, thereby effectively improving the overall pull-out strength;

[0042] 2. The construction method of the pull-out resistant prefabricated hollow pipe pile and foundation connection structure of the present invention performs layered processing on the structure of the inner wall of the prefabricated hollow pipe pile, and divides it into a concrete outer filling layer, a steel bar filling layer and a concrete inner filling layer, and sets different stripping means for the treatment of the pure concrete layer and the steel bar-containing concrete layer. At the same time, the concrete layer between adjacent steel bar segments in the steel bar filling layer is thin and relatively fragile, so a punching method is adopted to improve the stripping and removal efficiency of the concrete;

[0043] 3. The construction method of the pull-out resistant prefabricated hollow pipe pile and foundation connection structure of the present invention improves the replacement efficiency of the stripping unit by adopting a detachable connection method. Since the stripping unit is a direct execution component and needs to be regularly maintained and replaced, the labor and cost of subsequent repair and maintenance can be saved by adopting a detachable method. The installation is simple, efficient and reliable.

[0044] 4. The construction method of a pull-out resistant prefabricated hollow pipe pile and foundation connection structure of the present invention, by setting a single motor drive mode and combining it with a double-sided rack drive, drives the punch assembly 235 body to move while also driving the punching and cutting head 2354 to move forward. Overall, the body and the cutter head on the body move forward at the same time, thereby increasing the punching and cutting speed. Only a single motor is required to drive it, thereby saving manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a schematic structural diagram of a steel bar stripping device for a pull-out resistant prefabricated hollow pipe pile and foundation connection structure according to an embodiment of the present invention;

[0046] Figure 2 A is a partial enlarged view of a pull-out resistant prefabricated hollow pipe pile and foundation connection structure according to an embodiment of the present invention;

[0047] Figure 3 It is a schematic diagram of the core principle structure of a steel bar stripping device for a pull-out resistant prefabricated hollow pipe pile and foundation connection structure according to an embodiment of the present invention;

[0048] Figure 4 A schematic diagram of the internal structure of a punching unit of a reinforcement stripping device for a pull-out resistant prefabricated hollow pipe pile and foundation connection structure according to an embodiment of the present invention;

[0049] Figure 5 This is a schematic diagram of the installation of a prefabricated pull-out resistant hollow pipe pile and foundation connection structure according to an embodiment of the present invention;

[0050] Figure 6 This is a flow chart of a construction method of a pull-out resistant prefabricated hollow pipe pile and foundation connection structure according to an embodiment of the present invention;

[0051] In all the drawings, the same reference numerals represent the same technical features, specifically: 1-base, 101-support column, 102-execution slide, 103-pile support end, 2-peeling table, 200-moving slide, 211-first rack portion, 212-slide drive gear, 221-first linear motor, 222-positioning vertical plate, 223-guide shaft, 224-guide connecting groove, 230-peeling unit, 231-base plate, 2 32-installation slot, 233-tube wall through hole, 234-metal sensor, 235-punch assembly, 2351-second rack, 2352-second linear motor, 2353-horizontal sliding rod, 23530-double-sided rack, 2354-punching cutter head, 23540-cutter head rack, 2355-cutter head drive gear, 2356-driven bevel gear, 2357-active bevel gear, 2358-upper gear, 2359- Impact drive gear, 23510-impact worm wheel, 23511-impact worm, 23512-lower gear, 236-grinding unit, 2360-guide block, 2361-sliding block, 2362-grinding head, 2363-extending component, 240-clamping unit, 241-clamping mounting block, 2411-first clamping head, 2412-second clamping head, 242-positioning bolt, 243-clamping slot, 244-clamping head , 3-prefabricated hollow pipe pile, 301-concrete outer filling layer, 302-reinforcement filling layer, 303-concrete inner filling layer, 4-pile self-rotation drive unit, 401-rolling friction wheel, 402-driven rolling wheel, 403-positioning support, 404-first self-rotation drive gear, 405-second self-rotation drive gear, 406-self-rotation drive motor, 5-concrete inner core, 501-anti-pullout rod, 502-anti-pullout rod pipe wall reinforcement. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0053] like Figures 1 to 5 As shown, in an embodiment of the present invention, the pull-out resistant prefabricated hollow pipe pile and foundation connection structure comprises:

[0054] A prefabricated hollow pipe pile 3 embedded under the foundation, a concrete core 5 installed and poured into the inner part of the prefabricated hollow pipe pile 3, and an anti-pullout rod 501 arranged at the center of the concrete core 5;

[0055] The steel bar stripping device for pre-stripping the end of a prefabricated hollow pipe pile 3 comprises: a base 1 placed above the ground, an execution slide 102 arranged at the front section of the base 1; a stripping platform 2 slidably connected to the execution slide 102, and a linear drive mechanism arranged below the stripping platform 2; a claw structure arranged above the stripping platform 2 for clamping into the wall of the prefabricated hollow pipe pile 3, a first linear motor 221 horizontally fixedly arranged in the claw structure, and a stripping unit 230 fixedly connected to the output end of the first linear motor 221 and in direct contact with the prefabricated hollow pipe pile 3 for stripping out the steel bars inside the prefabricated hollow pipe pile 3 ; A pipe pile self-rotation drive unit 4 for supporting and driving the prefabricated hollow pipe pile 3 to rotate axially, comprising a self-rotation drive motor 406 fixedly connected to the base 1, a second self-rotation drive gear 405 fixedly connected to the output shaft of the self-rotation drive motor 406, a first self-rotation drive gear 404 meshing with the second self-rotation drive gear 405 for transmission, a rolling friction wheel 401 axially fixedly connected to the first self-rotation drive gear 404 via a transmission shaft, a positioning support 403 fixedly connected to the pipe pile support end 103 at one end of the base 1, and a driven rolling wheel 402 rotationally connected to the positioning support 403 via a transmission shaft.

[0056] In the embodiment of the present invention, by arranging a connection structure of a concrete core and an anti-pullout rod combination inside the prefabricated hollow pipe pile, the overall pull-out strength of the pull-out pile is effectively improved. At the same time, the technical problem that it is difficult to extend the steel bar after the threaded section of the pipe wall steel bar is completely cut off is solved to a certain extent; in addition, by proposing an auxiliary construction device that can perform steel bar stripping treatment on the prefabricated hollow pipe pile in advance, the connection difficulty after the threaded section is completely cut off is further solved. During construction, the construction personnel only need to perform plane sawing on the prefabricated hollow pipe pile according to the construction length requirements, and then put the pipe pile into the steel bar stripping device to separately strip out the steel bar section in the end concrete, which greatly enhances the connection contact area between the extended steel bar and the pipe wall steel bar in the subsequent construction process, thereby effectively improving the overall pull-out strength.

[0057] When in use, first calculate the total length of the required anti-pulling piles, thereby calculating the number of prefabricated hollow pipe piles 3 required, and calculate the length of the prefabricated hollow pipe piles 3 located at the top that needs to be cut off;

[0058] Next, manual sawing is performed to cut off the prefabricated hollow pipe pile 3 according to the calculated position;

[0059] Next, the sawn prefabricated hollow pipe pile 3 is placed in the steel stripping device and kept in direct contact with the rolling friction wheel 401 and the driven rolling wheel 402, and one end of the sawn surface is installed in the claw structure, the linear drive mechanism is controlled to make the stripping platform 2 move forward, and then the first linear motor 221 is controlled to extend until the pile wall of the prefabricated hollow pipe pile 3 penetrates into the stripping unit 230, and then the stripping unit 230 is started, and the self-rotation drive motor 406 is started. Driven by the self-rotation drive motor 406, the second self-rotation drive gear 405 rotates, thereby driving the first self-rotation drive gear 404 to rotate, and then driving the rolling friction wheel 401 to rotate. Under the action of friction, the prefabricated hollow pipe pile rotates accordingly. At the same time, the stripping unit 230 grinds the concrete inner filling layer 303 and the concrete outer filling layer 301 of the prefabricated hollow pipe pile 3, and punches the concrete section between adjacent steel bars in the steel bar filling layer 302, thereby completing the stripping operation of the end steel bars.

[0060] Next, the stripped prefabricated hollow pipe pile 3 is installed under the foundation, and an anti-pullout rod 501 is installed in the inner core, and a firm connection is established with the inner wall of the hollow pipe pile through an anchoring mechanism, and concrete is poured at the same time;

[0061] Next, the extended steel bar is fixedly connected to the steel bar segment stripped from the upper end of the prefabricated hollow pipe pile 3 by welding, thereby completing the installation of the prefabricated hollow pipe pile;

[0062] Next, the foundation is constructed to complete the entire construction process.

[0063] like Figure 5 As shown, in the embodiment of the present invention, the anti-pullout rod 501 includes:

[0064] Anti-pullout rod pipe wall reinforcement 502 is provided at the upper end.

[0065] like Figure 5 As shown, in the embodiment of the present invention, the anti-pullout rod 501 is reinforced and connected to the inner wall of the prefabricated hollow pipe pile through an anchoring mechanism.

[0066] like Figure 1 As shown, in the embodiment of the present invention, a support column 101 is provided below the base 1 .

[0067] like Figure 1 As shown, in an embodiment of the present invention, the linear drive mechanism comprises:

[0068] A first rack portion 211 fixedly disposed at the bottom of the peeling table 2;

[0069] A slide drive gear 212 disposed below the execution slide slot 102 and rotatably connected to the base 1;

[0070] A motor that drives the slide drive gear 212 to rotate.

[0071] like Figure 1 , Figure 3 and Figure 4 As shown, in the embodiment of the present invention, the stripping unit 230 includes:

[0072] A positioning vertical plate 222 fixedly connected to the output end of the first linear motor 221;

[0073] A base plate 231 detachably connected to the positioning plate 222 via a snap-on unit 240;

[0074] Metal sensors 234 are provided at the lower left and upper right of the side of the base plate 231 to detect whether the steel bar filling layer 302 is exposed;

[0075] The grinding unit 236 disposed at the upper left and lower right of the side of the base plate 231 is used to remove the outer filling layer 301 of concrete and the inner filling layer 303 of concrete, and includes: a guide block 2360 fixedly connected to the side of the base plate 231, a sliding block 2361 slidably connected to the guide block 2360 through an extended part 2363, and a grinding head 2362 disposed at the extended end of the sliding block 2361;

[0076] A punch assembly 235 is used for punching out the thin cement layer remaining between adjacent steel bars in the steel bar filling layer 302 .

[0077] In an embodiment of the present invention, the structure of the inner wall of the prefabricated hollow pipe pile is layered and divided into a concrete outer filling layer, a steel bar filling layer and a concrete inner filling layer, and different stripping means are set for the treatment of pure concrete layer and reinforced concrete layer. At the same time, since the concrete layer between adjacent steel bar segments in the steel bar filling layer is thin and relatively fragile, a punching method is adopted to improve the stripping and removal efficiency of the concrete.

[0078] like Figure 2 , Figure 3 As shown, in the embodiment of the present invention, the card connection unit 240 includes:

[0079] A clamping head entrance 244 and a clamping groove 243 are arranged near the upper and lower ends of the positioning vertical plate, and installation slots 232 are arranged at the upper and lower ends of the base plate 231. A clamping mounting block 241 is loaded into the clamping head entrance 244 and clamped to the clamping groove 243. The second clamping head 2412 of the clamping mounting block 241 is fixedly connected to the clamping groove 243 by a positioning bolt 242, and the first clamping head 2411 of the clamping mounting block 241 is clamped to the installation slot 232.

[0080] In the embodiment of the present invention, the replacement efficiency of the stripping unit is improved by adopting a detachable connection method. Since the stripping unit is a direct execution component and needs to be maintained and replaced regularly, the labor and cost of subsequent repairs and maintenance can be saved by adopting a detachable method. The installation is simple, efficient and the fixation is reliable.

[0081] like Figure 1 As shown, in the embodiment of the present invention, the recessed claw structure further includes:

[0082] Both upper and lower sides are provided with guide shafts 223 for sliding connection with guide connection grooves 224 arranged near the upper and lower ends of the positioning vertical plate for movement guidance.

[0083] like Figure 5 As shown, in the embodiment of the present invention, the pre-stripped steel bar segments of the prefabricated hollow pipe pile 3 are fixedly connected with the extended steel bars by welding.

[0084] like Figure 3 and Figure 4 As shown, in the embodiment of the present invention, the punch assembly 235 includes:

[0085] A second linear motor 2352, a horizontal sliding rod 2353 fixedly connected to the output shaft thereof, and double-sided racks 23530 arranged on the upper and lower sides of the horizontal sliding rod 2353;

[0086] A lower gear 23512 meshingly connected to the lower rack of the double-sided racks 23530, an impulse worm 23511 axially fixedly connected to the lower gear 23512 via a transmission shaft, an impulse worm wheel 23510 meshingly connected to the impulse worm 23511, and an impulse driving gear 2359 axially connected to the impulse worm wheel 23510 via a transmission shaft and linearly driven by the second rack portion 2351;

[0087] An upper gear 2358 meshingly connected to the upper rack in the double-sided rack 23530, an active bevel gear 2357 axially fixedly connected to the upper gear 2358 via a transmission shaft, a driven bevel gear 2356 meshingly connected to the active bevel gear 2357, a cutter head driving gear 2355 axially fixedly connected to the driven bevel gear 2356 via a transmission shaft, and a punching cutter head 2354 with a cutter head rack portion 23540 meshingly connected to the cutter head driving gear 2355 provided below.

[0088] In the embodiment of the present invention, a single motor driving mode is set up, combined with a double-sided rack drive, which drives the punch assembly 235 body to move while also driving the punching and cutting head 2354 to move forward. Overall, the body and the cutter head on the body move forward at the same time, thereby increasing the punching and cutting speed. Only a single motor is required to drive the drive, thereby saving manufacturing costs.

[0089] like Figure 6 As shown, in an embodiment of the present invention, a construction method of a pull-out resistant prefabricated hollow pipe pile and foundation connection structure is proposed, comprising:

[0090] S100: First, the total length of the required anti-pulling piles is calculated, thereby calculating the number of prefabricated hollow pipe piles 3 required, and calculating the length of the prefabricated hollow pipe piles 3 located at the top that needs to be cut off;

[0091] S200: Perform manual sawing to cut off the prefabricated hollow pipe pile 3 according to the calculated position;

[0092] S300: The sawn prefabricated hollow pipe pile 3 is placed in the steel stripping device, and is kept in direct contact with the rolling friction wheel 401 and the driven rolling wheel 402, and one end of the sawn surface is loaded into the claw structure, the linear drive mechanism is controlled to make the stripping platform 2 move forward, and then the first linear motor 221 is controlled to extend until the pile wall of the prefabricated hollow pipe pile 3 penetrates into the stripping unit 230, and then the stripping unit 230 is started, and the self-rotation drive motor 406 is started. Driven by the self-rotation drive motor 406, the second self-rotation drive gear 405 rotates, thereby driving the first self-rotation drive gear 404 to rotate, and then driving the rolling friction wheel 401 to rotate. Under the action of friction, the prefabricated hollow pipe pile rotates accordingly. At the same time, the stripping unit 230 grinds the concrete inner filling layer 303 and the concrete outer filling layer 301 of the prefabricated hollow pipe pile 3, and punches the concrete section between adjacent steel bars in the steel bar filling layer 302, thereby completing the stripping operation of the end steel bars.

[0093] S400: Install the stripped prefabricated hollow pipe pile 3 under the foundation, install the anti-pullout rod 501 in the inner part, and establish a firm connection with the inner wall of the hollow pipe pile through an anchoring mechanism, and pour concrete at the same time;

[0094] S500: The extended steel bar is fixedly connected to the steel bar segment stripped from the upper end of the prefabricated hollow pipe pile 3 by welding, thereby completing the installation of the prefabricated hollow pipe pile;

[0095] S600: Construct the foundation to complete the entire construction process.

[0096] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction method for a pull-out resistant prefabricated hollow pipe pile and foundation connection structure, characterized in that: include: A prefabricated hollow pipe pile (3) embedded under the foundation, a concrete core (5) installed and poured into the inner part of the prefabricated hollow pipe pile (3), and an anti-pullout rod (501) arranged at the center of the concrete core (5); A steel bar stripping device for pre-stripping the end of a prefabricated hollow pipe pile (3), comprising: a base (1) placed above the ground, an execution slide groove (102) arranged at the front section of the base (1); a stripping platform (2) slidably connected to the execution slide groove (102), and a linear drive mechanism arranged below the stripping platform (2); a claw structure arranged above the stripping platform (2) for engaging with the pile wall of the prefabricated hollow pipe pile (3), a first linear motor (221) horizontally fixedly arranged in the claw structure, and a stripping unit (230) fixedly connected to the output end of the first linear motor (221) and in direct contact with the prefabricated hollow pipe pile (3) for stripping the steel bars inside the prefabricated hollow pipe pile (3); A pipe pile self-rotation drive unit (4) for supporting and driving a prefabricated hollow pipe pile (3) to rotate axially, comprising a self-rotation drive motor (406) fixedly connected to a base (1), a second self-rotation drive gear (405) fixedly connected to an output shaft of the self-rotation drive motor (406), a first self-rotation drive gear (404) meshing with the second self-rotation drive gear (405), a rolling friction wheel (401) axially fixedly connected to the first self-rotation drive gear (404) via a transmission shaft, a positioning support (403) fixedly connected to a pipe pile support end (103) at one end of the base (1), and a driven rolling wheel (402) rotationally connected to the positioning support (403) via a transmission shaft; Construction methods include: S100: Firstly, the total length of the required anti-pulling piles is calculated, thereby calculating the number of prefabricated hollow pipe piles (3) required, and calculating the length of the prefabricated hollow pipe piles (3) located at the top that needs to be cut off; S200: Performing manual sawing to cut the prefabricated hollow pipe pile (3) according to the calculated position; S300: placing the sawn prefabricated hollow pipe pile (3) in a steel bar stripping device and maintaining direct contact with the rolling friction wheel (401) and the driven rolling wheel (402), and inserting one end of the sawn surface into the concave claw structure, controlling the linear drive mechanism to make the stripping platform (2) move forward, and then controlling the first linear motor (221) to extend until the pile wall of the prefabricated hollow pipe pile (3) penetrates deep into the stripping unit (230), and then starting the stripping unit (230) and starting the self-rotation drive motor (406). Driven by the self-rotation drive motor (406), The second self-rotating driving gear (405) rotates, thereby driving the first self-rotating driving gear (404) to rotate, and further driving the rolling friction wheel (401) to rotate, and under the action of the friction force, the prefabricated hollow pipe pile rotates accordingly. At the same time, the stripping unit (230) grinds the concrete inner filling layer (303) and the concrete outer filling layer (301) of the prefabricated hollow pipe pile (3), and punches the concrete section between adjacent steel bars in the steel bar filling layer (302), thereby completing the stripping operation of the end steel bars; S400: installing the stripped prefabricated hollow pipe pile (3) below the foundation, inserting an anti-pullout rod (501) into the inner core, and establishing a firm connection with the inner wall of the hollow pipe pile through an anchoring mechanism, while pouring concrete; S500: The extended steel bar is fixedly connected to the steel bar segment peeled off from the upper end of the prefabricated hollow pipe pile (3) by welding, thereby completing the installation of the prefabricated hollow pipe pile; S600: Construct the foundation to complete the entire construction process.

2. The construction method of a pull-out resistant prefabricated hollow pipe pile and foundation connection structure according to claim 1, characterized in that: The anti-pulling rod (501) comprises: The upper end is provided with anti-pullout rod pipe wall reinforcement (502).

3. The construction method of the pull-out resistant prefabricated hollow pipe pile and foundation connection structure according to claim 2, characterized in that: The anti-pulling rod (501) is reinforced and connected to the inner wall of the prefabricated hollow pipe pile via an anchoring mechanism.

4. The construction method of a pull-out resistant prefabricated hollow pipe pile and foundation connection structure according to any one of claims 1 to 3, characterized in that: A support column (101) is provided below the base (1).

5. The construction method of the pull-out resistant prefabricated hollow pipe pile and foundation connection structure according to claim 4, characterized in that: The linear drive mechanism comprises: A first rack portion (211) fixedly arranged at the bottom of the peeling table (2); A slide drive gear (212) disposed below the execution slide groove (102) and rotatably connected to the base (1); A motor drives the slide drive gear (212) to rotate.

6. The construction method of the pull-out resistant prefabricated hollow pipe pile and foundation connection structure according to claim 5, characterized in that: The stripping unit (230) comprises: A positioning vertical plate (222) fixedly connected to the output end of the first linear motor (221); A base plate (231) detachably connected to the positioning vertical plate (222) via a snap-on unit (240); Metal sensors (234) disposed at the lower left and upper right sides of the side of the base plate (231) for monitoring whether the steel bar filling layer (302) is exposed; A grinding unit (236) disposed at the upper left and lower right sides of the side of the base plate (231) for removing the outer filling layer (301) of concrete and the inner filling layer (303) of concrete, comprising: a guide block (2360) fixedly connected to the side of the base plate (231), a sliding block (2361) slidably connected to the guide block (2360) via an extended component (2363), and a grinding head (2362) disposed at the extended end of the sliding block (2361); A punch assembly (235) for punching out a cement thin layer remaining between adjacent steel bars in a steel bar filling layer (302).

7. The construction method of the pull-out resistant prefabricated hollow pipe pile and foundation connection structure according to claim 6, characterized in that: The clamping unit (240) comprises: A clamping head entrance (244) and a clamping slot (243) are arranged near the upper and lower ends of the positioning vertical plate, installation slots (232) are arranged at the upper and lower ends of the base plate (231), and a clamping installation block (241) is loaded into the clamping head entrance (244) and clamped to the clamping slot (243), the second clamping head (2412) of the clamping installation block (241) is fixedly connected to the clamping slot (243) by a positioning bolt (242), and the first clamping head (2411) of the clamping installation block (241) is clamped to the installation slot (232).

8. The construction method of the pull-out resistant prefabricated hollow pipe pile and foundation connection structure according to claim 7, characterized in that: The concave claw structure further includes: Both upper and lower sides are provided with guide shafts (223) which are slidably connected to guide connection grooves (224) arranged near the upper and lower ends of the positioning vertical plate for motion guidance.

9. The construction method of the pull-out resistant prefabricated hollow pipe pile and foundation connection structure according to claim 6, characterized in that: The punch assembly (235) comprises: A second linear motor (2352), a horizontal sliding rod (2353) fixedly connected to the output shaft thereof, and double-sided racks (23530) arranged on the upper and lower sides of the horizontal sliding rod (2353); A lower gear (23512) meshingly connected to the lower rack of the double-sided racks (23530), an impact worm (23511) axially fixedly connected to the lower gear (23512) via a transmission shaft, an impact worm wheel (23510) meshingly connected to the impact worm (23511), and an impact driving gear (2359) axially connected to the impact worm wheel (23510) via a transmission shaft and linearly connected to the second rack portion (2351); An upper gear (2358) meshingly connected to the upper rack of the double-sided racks (23530), a driving bevel gear (2357) axially fixedly connected to the upper gear (2358) via a transmission shaft, a driven bevel gear (2356) meshingly connected to the driving bevel gear (2357), a cutter head driving gear (2355) axially fixedly connected to the driven bevel gear (2356) via a transmission shaft, and a punching cutter head (2354) having a cutter head rack portion (23540) meshingly connected to the cutter head driving gear (2355) at the bottom.

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