A method for constructing an expanded drill rock-socketed tubular pile

Abstract

This application relates to the field of pipe pile construction technology, and provides a method for constructing precast pipe piles embedded in rock by expanding the borehole. The method is implemented using expanding drilling equipment. The method includes the following steps: a) fixing the first positioning and tensioning device to the inner side of the upper end of the first section of pipe pile, so as to install the expanding drilling equipment in the first section of pipe pile; b) pressing the first section of pipe pile into the soil by static pressure pile driving construction method, and repeating the operation of connecting the next section of pipe pile to the first section of pipe pile and pressing the next section of pipe pile into the soil until the first section of pipe pile reaches the rock surface, and stopping the pile driving; c) enabling at least a part of the expanding hole implementation component to extend downwards from the lower end of the pipe pile; d) starting the rotary drive device to drive the expanding hole implementation component to rotate, so that the expanding hole implementation component cuts the rock. This method can efficiently and quickly carry out precast pipe pile rock-embedded construction.

Description

Technical Field

[0001] This application relates to the field of pipe pile construction technology, and more specifically, to a method for constructing expanded-drill rock-socketed pipe piles. Background Technology

[0002] In the field of pipe pile construction in civil engineering, prestressed concrete pipe piles are widely used due to their advantages such as stable quality, high strength, and fast construction speed brought about by factory prefabrication. However, when the engineering geological conditions include rock strata or hard and dense soil layers, traditional prestressed pipe pile construction methods face significant technical bottlenecks and economic challenges.

[0003] Traditional precast pipe pile rock-driving construction typically employs a separate "drilling first, then pile installation" operation mode. Specifically, during construction, specialized drilling equipment (such as long spiral drilling rigs or rotary drilling rigs) is first used to pre-drill a hole at the pile location, penetrating the overlying soil layer and entering or penetrating the designed rock strata to form a pre-drilled channel. Only then can the static pressure or hammer-driven piling equipment be switched to insert the prestressed pipe pile into the pre-drilled hole. This process has the following significant drawbacks: First, the construction process is divided into two independent stages, requiring the configuration and scheduling of different types of heavy machinery, resulting in complex process connections, low overall construction efficiency, and extended construction period. Furthermore, the high cost of specialized drilling equipment and additional process costs significantly increase the overall construction cost of rock-driving pipe piles, and it fails to fully utilize the inherent advantages of the high strength of the prestressed pipe pile body. Summary of the Invention

[0004] In view of this, this application provides a method for constructing precast pipe piles embedded in rock by expanding the drilling depth, in order to solve the technical problems of low construction efficiency and inability to fully utilize the high strength of prestressed pipe piles in the rock drilling process in the prior art.

[0005] This application provides a method for constructing expanded-drill rock-socketed pipe piles, wherein the method is implemented using expanded-drilling equipment, the expanded-drilling equipment comprising: First positioning and tensioning device; A rotary drive device, which is connected below the lifting drive device; The drill rod has its upper end rotatably connected to the rotary drive device and in transmission cooperation with the power output end of the rotary drive device. The lower part of the drill rod is provided with a hole-reaming component, at least a portion of which can extend downwards out of the lower end of the pipe pile. The method for constructing expanded-drill rock-socketed pipe piles includes the following steps: a. Fix the first positioning and tensioning device to the inner side of the upper end of the first section of pipe pile, so as to install the drilling equipment in the first section of pipe pile; b. Drive the first section of pipe pile into the soil using the static pressure pile driving method. Repeat the operation of connecting the next section of pipe pile to the first section of pipe pile and driving the next section of pipe pile into the soil until the first section of pipe pile reaches the rock surface, then stop driving the pile. c. Allowing at least a portion of the hole-reaming component to extend downwards beyond the lower end of the pipe pile; d. Activate the hole enlargement component to cut the rock.

[0006] Furthermore, the hole reaming implementation component includes a pair of fixed reaming rollers and a pair of movable reaming rollers. The drilling reaming equipment also includes a lifting drive mechanism that is vertically connected to the drill rod. The pair of fixed reaming rollers are fixed to the lower part of the drill rod, and the pair of movable reaming rollers are connected to the lifting drive mechanism. The lifting drive mechanism can drive the pair of movable reaming rollers to extend downwards outwards from the lower end of the pipe pile. When the pair of movable reaming rollers extend downwards outwards from the lower end of the pipe pile, they move outwards relative to each other.

[0007] Furthermore, a guide plate is connected to the lower part of the drill rod, and an inclined guide groove is formed on the guide plate that gradually moves downward away from the drill rod. The movable reaming rollers are hinged to the lifting drive mechanism via a hinge rod, and a guide post is provided on the hinge rod. The lifting drive mechanism drives the pair of movable reaming rollers to move downward, and before the guide post enters the inclined guide groove, the pair of movable reaming rollers are limited by the pipe pile and move vertically. When the lifting drive mechanism drives the pair of movable reaming rollers to move downward, and the guide post enters the inclined guide groove and continues to move along the inclined guide groove, the pair of movable reaming rollers disengage from the pipe pile's limitation and extend downward outward from the lower end of the pipe pile and move outward relative to each other.

[0008] Furthermore, the lifting drive mechanism is a sliding hydraulic cylinder that is mounted on the outer periphery of the drill rod and is capable of sliding along the axial direction of the drill rod.

[0009] Furthermore, the hole reaming implementation components include a rock-cutting reamer and a reaming drill bit formed at the lower end of the drill rod. The reaming equipment also includes a lifting drive device and a second positioning and tensioning device rotatably mounted on the outer periphery of the drill rod. The lifting drive device can drive the rotary drive device to move up and down within the pipe pile, so as to drive the reaming drill bit to extend downwards out of the lower end of the pipe pile or to drive the reaming drill bit upwards back into the pipe pile. The lifting drive device is connected below the first positioning and tensioning device. The second positioning and tensioning device has a plurality of first material passage holes formed on it. The first material passage holes pass through both ends of the second positioning and tensioning device along the axial direction of the drill rod. Step a also includes fixing the second positioning and tensioning device to the inner side of the pipe pile.

[0010] Furthermore, the drill rod is provided with double helical blades extending along the axial direction of the drill rod, and a plurality of fixed rock cutting teeth are provided at the bottom of the double helical blades near the position of the reaming drill bit. The reaming equipment also includes a slag suction pipe, which passes through both ends of the first positioning and tensioning device along the axial direction of the drill rod. The drilling reaming equipment also includes a grinding disc fitted around the outer periphery of the drill rod. The grinding disc and the drill rod are rotatably limited relative to each other along the outer circumference of the drill rod. The grinding disc has a plurality of second material passage holes formed on it. The second material passage holes pass through both ends of the grinding disc along the axial direction of the drill rod. The grinding disc is positioned above the second positioning and tensioning device at intervals. The lower end of the slag suction pipe is located above the grinding disc. The lower surface of the grinding disc and the upper surface of the second positioning and tensioning device both have a frosted surface. A grinding ball is connected below the grinding disc, and the grinding ball has a frosted surface.

[0011] Furthermore, the first positioning and tensioning device includes a plurality of first horizontal hydraulic cylinders, the second positioning and tensioning device includes a plurality of second horizontal hydraulic cylinders, the first positioning and tensioning device includes a tensioning disc, the cylinder body of the first horizontal hydraulic cylinder is integrally formed with the tensioning disc to form a first hydraulic cavity, and a first sliding pressure block is installed in the first hydraulic cavity; The second positioning tensioning device includes a tensioning sleeve, and the cylinder body of the second horizontal hydraulic cylinder is integrally formed with the tensioning sleeve to form a second hydraulic chamber, in which a second sliding pressure block is installed; Step a includes: introducing hydraulic oil into the first hydraulic chamber to drive the first sliding block to move radially outward toward the tensioning disc and press against and secure the upper inner side of the first section of the pipe pile; and introducing hydraulic oil into the second hydraulic chamber to drive the second sliding block to move radially outward toward the tensioning sleeve and press against and secure the inner side of the first section of the pipe pile.

[0012] Furthermore, the number of first horizontal hydraulic cylinders is four. These four first horizontal hydraulic cylinders are arranged sequentially at 90° intervals along the circumference of the tensioning disc. The extended ends of the first sliding blocks of two of the four first horizontal hydraulic cylinders located in the same radial direction are connected to two first vertically spaced first swing blocks. Each first vertical swing block is hinged to the extended end of the first sliding block via a first hinge shaft arranged horizontally. A first torsion spring is provided on the first hinge shaft. The first torsion spring generates a force that brings the two first vertical swing blocks together. Introducing hydraulic oil into the first hydraulic chamber corresponding to each first vertical swing block drives the corresponding first sliding block to move radially outward from the tensioning disc, thereby allowing the two first vertical swing blocks to overcome the... The first torsion spring forces the two first horizontal hydraulic cylinders, which are located in the same radial direction, to press and hold each other together on the inner side of the upper end of the first pipe pile. The extended ends of the first sliding blocks of the other two first horizontal hydraulic cylinders are connected to two first lateral swing blocks arranged horizontally at intervals. Each first lateral swing block is hinged to the extended end of the first sliding block through a second hinge shaft. The second hinge shaft is arranged in a vertical direction and is provided with a second torsion spring. The second torsion spring generates a force that brings the two first lateral swing blocks together. Hydraulic oil is introduced into the first hydraulic chamber corresponding to the first lateral swing block, which can drive the corresponding first sliding block to move radially outward toward the tensioning disc, so that the two first lateral swing blocks overcome the force of the second torsion spring and press and hold each other together on the inner side of the upper end of the first pipe pile.

[0013] Furthermore, the number of second horizontal hydraulic cylinders is four. These four cylinders are arranged sequentially at 90° intervals along the circumference of the tensioning sleeve. The extended ends of the second sliding blocks of two of the four cylinders, located in the same radial direction, are connected to two second vertically oscillating blocks arranged at vertical intervals. Each second vertical oscillating block is hinged to the extended end of the second sliding block via a third hinge shaft arranged horizontally. A third torsion spring is mounted on the third hinge shaft, generating a force that brings the two second vertical oscillating blocks together. Introducing hydraulic oil into the second hydraulic chamber corresponding to each second vertical oscillating block drives the corresponding second sliding block to move radially outwards towards the tensioning sleeve, thereby overcoming the... The force of the third torsion spring causes the two blocks to open and press firmly against each other on the inner side of the first section of the pipe pile. The protruding ends of the second sliding blocks of the other two second horizontal hydraulic cylinders in the same radial direction are connected to two second lateral swing blocks arranged horizontally at intervals. Each second lateral swing block is hinged to the protruding end of the second sliding block through a fourth hinge shaft. The fourth hinge shaft is arranged in the vertical direction and is equipped with a fourth torsion spring. The fourth torsion spring generates a force that brings the two second lateral swing blocks together. Hydraulic oil is introduced into the second hydraulic chamber corresponding to the second lateral swing block, which can drive the corresponding second sliding block to move radially outward toward the tension sleeve, so that the two second lateral swing blocks overcome the force of the fourth torsion spring and open and press firmly against each other on the inner side of the first section of the pipe pile.

[0014] Furthermore, the drilling reaming equipment also includes a docking sleeve, a first hydraulic oil output pipe, a first hydraulic oil return pipe, a second hydraulic oil output pipe, and a second hydraulic oil return pipe passing through the tensioning plate, wherein the first hydraulic oil output pipe and the first hydraulic oil return pipe both lead to each of the first hydraulic chambers. The inner side of the sidewall of the docking sleeve is rotatably sealed to the outer circumferential surface of the drill rod. The inner side of the sidewall of the docking sleeve is provided with a first annular groove and a second annular groove. The sidewall of the docking sleeve is provided with a first radial through hole and a second radial through hole. One end of the first radial through hole extends through to the first annular groove, and the other end of the first radial through hole extends through to the outer side of the sidewall of the docking sleeve and is connected to the second hydraulic oil output pipe. One end of the second radial through hole extends through to the second annular groove, and the other end of the second radial through hole extends through to the outer side of the sidewall of the docking sleeve and is connected to the second hydraulic oil return pipe. The inner side of the tensioning sleeve's sidewall is rotatably sealed to the outer circumferential surface of the drill rod. The inner side of the tensioning sleeve's sidewall is provided with a third annular groove and a fourth annular groove. The tensioning sleeve's sidewall is provided with a third radial through hole and a fourth radial through hole. One end of the third radial through hole extends through the third annular groove, and the other end of the third radial through hole extends through the second hydraulic cavity. One end of the fourth radial through hole extends through the fourth annular groove, and the other end of the fourth radial through hole extends through the second hydraulic cavity. The drill pipe is provided with a first oil passage and a second oil passage. The upper port of the first oil passage is connected to the first annular groove, and the lower port of the first oil passage is connected to the third annular groove. The upper port of the second oil passage is connected to the second annular groove, and the lower port of the second oil passage is connected to the fourth annular groove.

[0015] The beneficial effects of the expanded drilling rock-socketed pipe pile construction method provided by this invention are as follows: Because the rock-embedded pipe pile construction method provided by this invention uses a complete set of equipment that integrates the drilling equipment with the first section of pipe pile for pile driving, it fully utilizes the high strength of the pipe pile itself. It eliminates the need to divide the precast pipe pile rock-embedded construction process into two independent stages, and eliminates the need to configure and schedule different types of heavy machinery. This allows for efficient and rapid precast pipe pile rock-embedded construction. Specifically, the drilling equipment can be installed inside the first section of pipe pile, and the first section of pipe pile can be driven into the soil using static pressure pile driving (i.e., the first section of pipe pile and the drilling equipment are integrated into a complete set of equipment). (Prepared to be pressed into the soil), and then continue to press the next section of pipe pile in sequence until the first section of pipe pile is pressed into the rock layer and the pile pressing stops. During the construction process, when the first section of pipe pile is being statically pressed into the rock layer or hard and dense soil layer, the bottom of the first section of pipe pile can be enlarged and drilled into the soft rock layer or hard and dense soil layer, so that the first section of pipe pile can be pressed into the rock layer smoothly. After the first section of pipe pile reaches the rock layer required by the design, high-pressure grouting can be used at the bottom of the first section of pipe pile to further improve the bonding strength between the bottom and outer wall of the first section of pipe pile and the rock layer, thereby achieving the high strength and high bearing capacity effect of the prestressed pipe pile.

[0016] Other beneficial effects of the present invention will be described below. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1This is a three-dimensional schematic diagram of the drilling equipment used in the drilling and rock-socketed pipe pile construction method according to an embodiment of this application, showing the cooperation between the drilling equipment and the first section of the pipe pile. Figure 2 This is a partial three-dimensional schematic diagram of a portion of the structure of the drilling equipment used in the drilling method for rock-socketed pipe piles according to an embodiment of this application. Figure 3 This is a cross-sectional schematic diagram of a portion of the drilling equipment used in the drilling method for embedded rock pipe piles according to an embodiment of this application. Figure 4 This is a three-dimensional schematic diagram of the drilling equipment used in the drilling and rock-socketed pipe pile construction method according to an embodiment of this application, showing the cooperation between the drilling equipment and the first section of the pipe pile. Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 for Figure 4 Enlarged view of point B in the middle; Figure 7 for Figure 4 Enlarged view of point C in the middle; Figure 8 This is a three-dimensional schematic diagram of the drilling equipment used in the drilling method for embedded rock pipe piles according to an embodiment of this application; Figure 9 for Figure 8 Enlarged view at point D; Figure 10 This is a partial cross-sectional view of the drilling equipment used in the drilling method for rock-socketed pipe piles according to an embodiment of this application. Figure 11 for Figure 10 Enlarged view at point E in the middle; Figure 12 for Figure 10 Enlarged view at point F; Figure 13 This is a three-dimensional schematic diagram of the first positioning and tensioning device in the drilling equipment used in the drilling-enlarged rock-socketed pipe pile construction method according to an embodiment of this application; Figure 14 This is a three-dimensional schematic diagram of the first positioning and tensioning device in the drilling equipment used in the drilling method for embedded rock pipe pile construction according to an embodiment of this application.

[0019] Explanation of reference numerals in the attached figures: 1-First section of pipe pile; 2-Positioning steel ring; 3-Lifting drive device; 4-Rotation drive device; 5-Double helical blade; 6-Fixed rock-cutting teeth; 7-Slag suction pipe; 10-First hydraulic oil output pipe; 11-First hydraulic oil return pipe; 12-Second hydraulic oil output pipe; 13-Second hydraulic oil return pipe; 14-Rock-cutting and hole-reaming blade; 15-Water turbine drive; 16-Water pipe; 17-Rotating shaft; 18-First motor oil pipe; 19-Second motor oil pipe; 20-Drive gear; 21-Driven gear; 2 2-First oil pipe; 23-Second oil pipe; 24-First vertical swinging pressure block; 25-First hinge shaft; 26-First horizontal swinging pressure block; 27-Second hinge shaft; 28-Second vertical swinging pressure block; 29-Third hinge shaft; 30-Second horizontal swinging pressure block; 31-Fourth hinge shaft; 35-Stop ring platform; 36-Fixed reaming wheel; 37-Modible reaming wheel; 38-Guide plate; 39-Inclined guide groove; 40-Hinged rod; 41-Guide post; 42-First inner pipe; 43-First oil pipe; 4 4-Second inner pipe; 45-Baffle plate; 46-Second oil pipe; 47-Fixing tooth; 48-Agitator blade; 49-Inner pressure pipe; 50-Outer pressure pipe; 100-First positioning and tensioning device; 101-Tensioning disc; 103-First sliding block; 200-Drill rod; 201-Reamer bit; 202-First oil passage; 203-Second oil passage; 204-Water delivery channel; 300-Second positioning and tensioning device; 301-First material passage; 302-Tensioning sleeve; 303-Second hydraulic chamber; 304 - Second sliding pressure block; 305 - Third annular groove; 306 - Fourth annular groove; 307 - Third radial through hole; 308 - Fourth radial through hole; 400 - Grinding disc; 401 - Second material passage hole; 402 - Grinding ball; 600 - Connecting sleeve; 601 - First annular groove; 602 - Second annular groove; 603 - First radial through hole; 604 - Second radial through hole; 605 - Fifth annular groove; 606 - Fifth radial through hole; 700 - Sliding hydraulic cylinder; 701 - Upper oil chamber; 702 - Lower oil chamber. Detailed Implementation

[0020] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. One or more embodiments of this application are exemplarily shown in the drawings to provide a more accurate and thorough understanding of the technical solutions disclosed herein. However, it should be understood that this application can be implemented in many different forms and is not limited to the embodiments described below.

[0021] In the accompanying drawings of this application, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0022] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously.

[0023] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0024] See Figures 1 to 14 This application provides a method for constructing reinforced rock-socketed pipe piles, wherein the method is implemented using a drilling reaming device, which includes: The first positioning and tensioning device 100, specifically, can be detachably fixed to the inner side of the upper end of the first section of pipe pile 1, and the lower end of the pipe pile 1 can be provided with fixing teeth 47 to facilitate tunneling operations. Rotary drive device 4 is connected below the first positioning and tensioning device 100; The upper end of the drill rod 200 is rotatably connected to the rotary drive device 4 and is in transmission cooperation with the power output end of the rotary drive device 4. The lower part of the drill rod 200 is provided with a hole enlarging implementation component, at least a part of which can extend downward out of the lower end of the pipe pile 1. The construction method for expanded drilling and rock-socketed pipe piles includes the following steps: a. Fix the first positioning tensioning device 100 to the inner side of the upper end of the first section of pipe pile 1 so as to install the drilling equipment in the first section of pipe pile 1. Specifically, a positioning steel ring 2 can be pre-embedded in the inner side of the upper end of the first section of pipe pile 1, or the positioning steel ring 2 can be temporarily welded to the pipe pile flange on the construction site. The first positioning tensioning device 100 is tensioned and positioned inside the positioning steel ring 2, so as to detachably install and fix the entire drilling equipment in the first section of pipe pile 1. In addition, two sealing rings can be set at the upper end of the first positioning tensioning device 100 to seal with the thickened ring on the positioning steel ring 2. b. The first section of pipe pile 1 is pressed into the soil by static pressure pile driving construction method. The operation of connecting the next section of pipe pile 1 to the first section of pipe pile 1 and pressing the next section of pipe pile 1 into the soil is repeated until the first section of pipe pile 1 reaches the rock surface and the pile driving is stopped. c. Allowing at least a portion of the hole-reaming component to extend downwards beyond the lower end of the pipe pile; d. Start the rotary drive device 4 to drive the hole reaming component to rotate, so that the hole reaming component can cut the rock.

[0025] Because the rock-embedded pipe pile construction method provided by this invention uses a complete set of equipment that integrates the drilling equipment with the first section of pipe pile 1 for pile driving operations, it fully utilizes the high strength of the first section of pipe pile 1. It eliminates the need to divide the precast first section of pipe pile 1 rock-embedded construction process into two independent stages, and eliminates the need to configure and schedule different types of heavy machinery. This allows for efficient and rapid precast pipe pile rock-embedded construction. Specifically, the drilling equipment can be installed inside the first section of pipe pile 1, and the first section of pipe pile 1 can be pressed into the soil using static pressure pile driving (i.e., the complete set of equipment that integrates the first section of pipe pile 1 with the drilling equipment). (After being pressed into the soil), the next section of the first pipe pile 1 is pressed in sequence until the first pipe pile 1 is pressed into the rock layer and the pile pressing stops. During the construction process, when the first pipe pile 1 is being statically pressed into the rock layer or hard and dense soil layer, the bottom of the first pipe pile 1 can be enlarged and drilled into the soft rock layer or hard and dense soil layer, so that the first pipe pile 1 can be smoothly pressed into the rock layer. After the first pipe pile 1 reaches the rock layer required by the design, high-pressure grouting can be used at the bottom of the first pipe pile 1 to further improve the bonding strength between the bottom and outer wall of the first pipe pile 1 and the rock layer, thereby achieving the high strength and high bearing capacity effect of the prestressed first pipe pile 1.

[0026] According to one embodiment of this application, the hole reaming implementation component includes a pair of fixed reaming rollers 36 and a pair of movable reaming rollers 37. The reaming equipment also includes a lifting drive mechanism that is vertically connected to the drill rod 200. The pair of fixed reaming rollers 36 are fixed to the lower part of the drill rod 200, and the pair of movable reaming rollers 37 are connected to the lifting drive mechanism. The lifting drive mechanism can drive the pair of movable reaming rollers 37 to extend downwards outwards from the lower end of the pipe pile 1. When the pair of movable reaming rollers 37 extend downwards outwards from the lower end of the pipe pile 1, they move outwards relative to each other. During operation, when the pair of movable reaming rollers 37 extend downwards outwards from the lower end of the pipe pile 1, the rotary drive device 4 is activated to drive the pair of fixed reaming rollers 36 and the pair of movable reaming rollers 37 to rotate and drill and ream the hole.

[0027] According to a specific embodiment of this application, a guide plate 38 is connected to the lower part of the drill rod 200. An inclined guide groove 39 is formed on the guide plate 38, which gradually moves downward away from the drill rod 200. The movable reaming roller 37 is hinged to the lifting drive mechanism through the hinge rod 40. A guide post 41 is provided on the hinge rod 40. The lifting drive mechanism drives a pair of movable reaming rollers 37 to move downward and before the guide post 41 enters the inclined guide groove 39, the pair of movable reaming rollers 37 are limited by the pipe pile 1 and move vertically. When the lifting drive mechanism drives a pair of movable reaming rollers 37 to move downward and the guide post 41 enters the inclined guide groove 39 and continues to move along the inclined guide groove 39, the pair of movable reaming rollers 37 are released from the limitation of the pipe pile 1 and extend downward from the lower end of the pipe pile 1 and move outward relative to each other.

[0028] According to a specific embodiment of this application, the lifting drive mechanism is a sliding hydraulic cylinder 700 that is mounted on the outer periphery of the drill rod 200 and is capable of sliding along the axial direction of the drill rod 200. The drill pipe 200 is equipped with a partition 45 located inside the sliding hydraulic cylinder 700. The partition 45 divides the sliding hydraulic cylinder 700 into an upper oil chamber 701 and a lower oil chamber 702. The drilling equipment also includes a first inner pipe 42 and a second inner pipe 44 installed inside the drill pipe 200. The lower end of the first inner pipe 42 is connected to the upper oil chamber 701, and the lower end of the second inner pipe 44 is connected to the upper oil chamber 701. The upper end of the first inner pipe 42 is connected to the first oil pipe 43 outside the drill pipe 200, and the upper end of the second inner pipe 44 is connected to the second oil pipe 46 outside the drill pipe 200. When oil enters the lower oil chamber 702 and oil exits the upper oil chamber 701, the sliding hydraulic cylinder 700 moves downward. When oil enters the upper oil chamber 701 and oil exits the lower oil chamber 702, the sliding hydraulic cylinder 700 moves upward.

[0029] In addition, a stirring blade 48 can be installed on the outside of the drill rod 200. After the rock blocks and mud are crushed by the fixed reaming roller 36 and the movable reaming roller 37, they are mixed and turned into fluid mud slag under the action of the stirring blade 48. The drilling equipment also includes an inner pressure pipe 49 installed inside the drill rod 200. The upper end of the inner pressure pipe 49 is connected to the outer pressure pipe 50 outside the drill rod 200, and the lower end of the inner pressure pipe 49 extends through the lower end side wall of the drill rod 200. On the one hand, water can be injected into the lower end of the drill rod 200 through the outer pressure pipe 50 and the inner pressure pipe 49 to cool the fixed reaming roller 36 and the movable reaming roller 37. On the other hand, cement grout can be injected into the lower end of the drill rod 200 through the outer pressure pipe 50 and the inner pressure pipe 49, that is, high-pressure grouting is performed on the bottom of the pile pipe 1, which can further improve the bonding strength between the bottom of the pile pipe 1 and the outer wall of the pile perimeter and the rock strata.

[0030] According to one embodiment of this application, the hole reaming implementation components include a rock-cutting reamer and a reaming drill bit formed at the lower end of the drill rod 200. The rock-cutting reamer is positioned on the drill rod 200 adjacent to the reaming drill bit 201. The reaming equipment also includes a lifting drive device 3 and a second positioning and tensioning device 300 rotatably mounted on the outer periphery of the drill rod 200. The lifting drive device 3 can drive the rotary drive device 4 to move up and down within the pipe pile 1, so as to drive the reaming drill bit 201 downward to extend out of the lower end of the pipe pile 1 or drive the reaming drill bit 201 towards... The drill rod 200 retracts into the pipe pile 1, and the lifting drive device 3 is connected below the first positioning and tensioning device 100. The second positioning and tensioning device 300 can be detachably fixed to the inner side of the pipe pile 1. The second positioning and tensioning device 300 has a plurality of first material passage holes 301 formed on it. The first material passage holes 301 pass through both ends of the second positioning and tensioning device 300 along the axial direction of the drill rod 200. When the drill rod 200 rotates, the second positioning and tensioning device 300 fixed to the inner side of the pipe pile 1 can provide good support for the movement of the drill rod 200.

[0031] According to a specific embodiment of this application, a double helical blade 5 is provided on the drill rod 200, extending along the axial direction of the drill rod 200. A plurality of fixed rock cutting teeth 6 are provided at the bottom of the double helical blade 5 near the position of the reaming drill bit 201. The fixed rock cutting teeth 6 can be high-strength cutting teeth, which can cut rock layers with a strength of about 20MPa. The reaming equipment also includes a slag suction pipe 7, which can be connected to a vacuum slag suction pump. The slag suction pipe 7 passes through both ends of the first positioning and tensioning device 100 along the axial direction of the drill rod 200. The drilling reaming equipment also includes a grinding disc 400 fitted around the outer periphery of the drill rod 200. The grinding disc 400 and the drill rod 200 are rotatably limited relative to each other along the outer circumference of the drill rod 200. Multiple second material passage holes 401 are formed on the grinding disc 400. The second material passage holes 401 penetrate both ends of the grinding disc 400 along the axial direction of the drill rod 200. The grinding disc 400 is positioned above the second positioning and tensioning device 300 at intervals. The lower end of the slag suction pipe 7 is located above the grinding disc 400. The lower surface of the grinding disc 400 and the second positioning and tensioning device 300 are connected. The upper surface of the grinding disc 400 has a frosted surface. A grinding ball 402 is connected below the grinding disc 400. The grinding ball 402 has a frosted surface. In other embodiments, the grinding ball 402 may not be provided. The rock and soil slag drilled out at the reaming drill bit 201 can be conveyed upward in the first section of the pipe pile 1 through the double helical blades 5. The slag passes through the first material passage 301 and is squeezed and ground between the grinding disc 400 and the second positioning and tensioning device 300. After becoming finer particles, it passes through the second material passage 401 and continues to move upward and is sucked away by the slag suction pipe 7.

[0032] According to a specific embodiment of this application, the first positioning tensioning device 100 includes a plurality of first horizontal hydraulic cylinders, and the second positioning tensioning device 300 includes a plurality of second horizontal hydraulic cylinders. The first positioning tensioning device 100 includes a tensioning disc 101. The cylinder body of the first horizontal hydraulic cylinder is integrally formed with the tensioning disc 101 to form a first hydraulic cavity. A first sliding pressure block 103 is installed in the first hydraulic cavity (the first hydraulic cavity is not shown; the structural fit between the first hydraulic cavity and the first sliding pressure block 103 is the same as or similar to the structural fit between the second hydraulic cavity 303 and the second sliding pressure block 304). A known structure such as a stop boss that stops each other can be provided between the cavity and the first sliding pressure block 103 to prevent the first sliding pressure block 103 from coming out of the first hydraulic cavity. A known spring return structure can also be provided between the first hydraulic cavity and the first sliding pressure block 103 to return the first sliding pressure block 103 to the first hydraulic cavity when the hydraulic oil in the first hydraulic cavity is drawn out. The first sliding pressure block 103 is equivalent to the piston rod of the first horizontal hydraulic cylinder. When hydraulic oil is introduced into the first hydraulic cavity, it can drive the first sliding pressure block 103 to move radially outward toward the tensioning plate 101, thereby supporting and pressing it onto the positioning steel ring 2. The second positioning tensioning device 300 includes a tensioning sleeve 302, a first material passage 301 formed on the tensioning sleeve 302, and a cylinder body of a second horizontal hydraulic cylinder integrally formed with the tensioning sleeve 302 to form a second hydraulic chamber 303. A second sliding block 304 is installed in the second hydraulic chamber 303. Known structures such as stop bosses that mutually stop each other can be provided between the second hydraulic chamber 303 and the second sliding block 304 to prevent the second sliding block 304 from dislodging from the second hydraulic chamber 303. A known spring return structure can also be provided between the second hydraulic chamber 303 and the second sliding block 304 to allow the second sliding block 304 to return to its original position when hydraulic oil is drawn out of the second hydraulic chamber 303. 04 Return to the second hydraulic chamber 303. The second sliding pressure block 304 is equivalent to the piston rod of the second horizontal hydraulic cylinder. When hydraulic oil is introduced into the second hydraulic chamber 303, it can drive the second sliding pressure block 304 to move radially outward toward the tensioning sleeve 302, thereby supporting and pressing it against the inner side of the first section of pipe pile 1. Step a includes: introducing hydraulic oil into the first hydraulic chamber to drive the first sliding pressure block 103 to move radially outward toward the tensioning disc 101 and support and press it against the inner side of the upper end of the first section of pipe pile 1, and introducing hydraulic oil into the second hydraulic chamber 303 to drive the second sliding pressure block 304 to move radially outward toward the tensioning sleeve 302 and support and press it against the inner side of the first section of pipe pile 1.

[0033] See Figure 13According to one embodiment of this application, the first positioning tensioning device 100 includes four first horizontal hydraulic cylinders. These four cylinders are arranged sequentially at 90° intervals along the circumference of the tensioning disc 101. The extended ends of the first sliding blocks 103 of two of the four first horizontal hydraulic cylinders, located in the same radial direction, are connected to two first vertically oscillating blocks 24 arranged at vertical intervals. Each first vertically oscillating block 24 is connected to the first sliding block 103 via a first hinge shaft 25. The extended end of section 3 is hinged, and the first hinge shaft 25 is arranged horizontally. A first torsion spring is provided on the first hinge shaft 25. The first torsion spring generates a force that brings the two first vertical swing blocks 24 together. Hydraulic oil is introduced into the first hydraulic chamber corresponding to the first vertical swing block 24, which drives the corresponding first sliding block 103 to move radially outward toward the tensioning disc 101, so that the two first vertical swing blocks 24 overcome the force of the first torsion spring and are pressed together on the inner side of the upper end of the first section of pipe pile 1. Four first horizontal hydraulic... The extended ends of the first sliding blocks 103 of the other two first horizontal hydraulic cylinders in the same radial direction are connected to two first lateral swing blocks 26 arranged horizontally at intervals. Each first lateral swing block 26 is hinged to the extended end of the first sliding block 103 via a second hinge shaft 27. The second hinge shaft 27 is arranged vertically and is equipped with a second torsion spring. The second torsion spring generates a force that brings the two first lateral swing blocks 26 together, and exerts a force on the first hydraulic cylinder corresponding to the first lateral swing block 26. Hydraulic oil is introduced into the cavity, which drives the corresponding first sliding pressure block 103 to move radially outward toward the tensioning disc 101, so that the two first lateral swing pressure blocks 26 overcome the force of the second torsion spring and press against each other on the inner side of the upper end of the first section of pipe pile 1. The two pairs of first vertical swing pressure blocks 24 strengthen the vertical limiting force on the tensioning disc 101, and the two pairs of first lateral swing pressure blocks 26 strengthen the lateral limiting force on the tensioning disc 101, further improving the firmness of the fixation between the tensioning disc 101 and the inner side of the first section of pipe pile 1.

[0034] See Figure 14According to one embodiment of this application, the second positioning tensioning device 300 includes four second horizontal hydraulic cylinders. These four cylinders are arranged sequentially at 90° intervals along the circumference of the tensioning sleeve 302. The extended ends of the second sliding blocks 304 of two of the four cylinders, located in the same radial direction, are connected to two second vertically oscillating blocks 28 arranged at vertical intervals. Each second vertically oscillating block 28 is connected to the second sliding block 304 via a third hinge 29. The extended end of 4 is hinged, and the third hinge shaft 29 is arranged horizontally. A third torsion spring is provided on the third hinge shaft 29. The third torsion spring generates a force that brings the two second vertical swing blocks 28 together. Hydraulic oil is introduced into the second hydraulic chamber 303 corresponding to the second vertical swing blocks 28, which can drive the corresponding second sliding block 304 to move radially outward toward the tensioning sleeve 302, so that the two second vertical swing blocks 28 overcome the force of the third torsion spring and are pressed together on the inner side of the first section of pipe pile 1. 4 second horizontal hydraulic... The protruding ends of the second sliding blocks 304 of the other two second horizontal hydraulic cylinders in the same radial direction are connected to two second lateral swing blocks 30 arranged horizontally at intervals. Each second lateral swing block 30 is hinged to the protruding end of the second sliding block 304 via a fourth hinge shaft 31. The fourth hinge shaft 31 is arranged vertically and is equipped with a fourth torsion spring. The fourth torsion spring generates a force that brings the two second lateral swing blocks 30 together, and exerts a force on the second hydraulic cylinder corresponding to the second lateral swing block 30. Hydraulic oil is introduced into cavity 303 to drive the corresponding second sliding pressure block 304 to move radially outward toward tension sleeve 302, so that the two second lateral swing pressure blocks 30 overcome the force of the fourth torsion spring and press against each other on the inner side of the first section of pipe pile 1. The two pairs of second vertical swing pressure blocks 28 strengthen the vertical limiting force against tension sleeve 302, and the two pairs of second lateral swing pressure blocks 30 strengthen the lateral limiting force against tension sleeve 302, further improving the firmness of the fixation between tension sleeve 302 and the inner side of the first section of pipe pile 1.

[0035] According to one embodiment of this application, the drilling equipment further includes a docking sleeve 600, a first hydraulic oil output pipe 10, a first hydraulic oil return pipe 11, a second hydraulic oil output pipe 12, and a second hydraulic oil return pipe 13, which are installed on the tensioning plate 101. The first hydraulic oil output pipe 10 and the first hydraulic oil return pipe 11 are both connected to each of the first hydraulic chambers. The docking sleeve 600 can be connected and fixed to the outer wall of the slag suction pipe 7. The inner side of the sidewall of the mating sleeve 600 is rotatably sealed to the outer circumferential surface of the drill rod 200. The inner side of the sidewall of the mating sleeve 600 is provided with a first annular groove 601 and a second annular groove 602. The sidewall of the mating sleeve 600 is provided with a first radial through hole 603 and a second radial through hole 604. One end of the first radial through hole 603 extends through to the first annular groove 601, and the other end of the first radial through hole 603 extends through to the outer side of the sidewall of the mating sleeve 600 and is connected to the second hydraulic oil output pipe 12. One end of the second radial through hole 604 extends through to the second annular groove 602, and the other end of the second radial through hole 604 extends through to the outer side of the sidewall of the mating sleeve 600 and is connected to the second hydraulic oil return pipe 13. The inner side of the sidewall of the tensioning sleeve 302 is rotatably sealed to the outer circumferential surface of the drill rod 200. The inner side of the sidewall of the tensioning sleeve 302 is provided with a third annular groove 305 and a fourth annular groove 306. The sidewall of the tensioning sleeve 302 is provided with a third radial through hole 307 and a fourth radial through hole 308. One end of the third radial through hole 307 extends to the third annular groove 305, and the other end of the third radial through hole 307 extends to the second hydraulic cavity 303. One end of the fourth radial through hole 308 extends to the fourth annular groove 306, and the other end of the fourth radial through hole 308 extends to the second hydraulic cavity 303. The drill pipe 200 has a first oil passage 202 and a second oil passage 203 inside. The upper end of the first oil passage 202 is connected to the first annular groove 601, and the lower end of the first oil passage 202 is connected to the third annular groove 305. The upper end of the second oil passage 203 is connected to the second annular groove 602, and the lower end of the second oil passage 203 is connected to the fourth annular groove 306.

[0036] It is understandable that the upper end of the first inner pipe 42 is connected to the first oil pipe 43 outside the drill pipe 200, the upper end of the second inner pipe 44 is connected to the second oil pipe 46 outside the drill pipe 200, and the upper end of the inner pressure pipe 49 is connected to the outer pressure pipe 50 outside the drill pipe 100, which can also adopt a similar structural design to the mating sleeve 600.

[0037] According to one embodiment of this application, a stop ring platform 35 is provided on the outer periphery of the drill pipe 200. The drill pipe 200 can move axially relative to the tension sleeve 302 between an oil guiding position and a non-oil guiding position. In the oil guiding position, the tension sleeve 302 is supported on the stop ring platform 35, and the lower end of the first oil passage 202 is aligned and connected with the third annular groove 305 along the axial direction of the drill pipe 200. The lower end of the second oil passage 203 is aligned and connected with the fourth annular groove 306 along the axial direction of the drill pipe 200. In the non-oil guiding position, the stop ring platform 35 is located at intervals below the tension sleeve 302. The lower end of the first oil passage 202 is offset from the third annular groove 305 along the axial direction of the drill pipe 200, and the lower end of the second oil passage 203 is offset from the fourth annular groove 306 along the axial direction of the drill pipe 200.

[0038] According to other embodiments of this application, the drill pipe 200 can also be axially bidirectionally limited relative to the tensioning sleeve 302 (unable to move axially), and the lower port of the first oil passage 202 is aligned with and connected to the third annular groove 305 along the axial direction of the drill pipe 200, and the lower port of the second oil passage 203 is aligned with and connected to the fourth annular groove 306 along the axial direction of the drill pipe 200.

[0039] According to one embodiment of this application, the rock-cutting and reaming device further includes a rock-cutting and reaming blade 14 and a water turbine driver 15 disposed on the double helical blade 5. The reaming equipment also includes a water pipe 16 passing through the tensioning plate 101. The rock-cutting and reaming blade 14 and the water turbine driver 15 are adjacent to the reaming drill bit 201. The rock-cutting and reaming blade 14 is rotatably connected to the double helical blade 5 via a rotating shaft 17. The rotating shaft 17 is connected to the power output end of the water turbine driver 15. The water pipe 16 is mounted on the tensioning plate 101. A fifth annular groove 605 is provided on the inner side of the side wall of the mating sleeve 600. A fifth radial through hole 606 is provided on the side wall of the mating sleeve 600. One end of the fifth radial through hole 606 extends through the fifth annular groove 605, and the other end extends through the outer side of the side wall of the mating sleeve 600 and is connected to the water pipe 16. The drill rod 200 is internally provided with... A water conveying channel 204 is provided, with its upper end connected to the fifth annular groove 605 and its lower end connected to the inlet of the water turbine drive 15. When the reaming drill bit 201 rotates and drills forward and is pushed out of the lower end of the first section of the pipe pile 1 by the lifting drive device 3, the rock-cutting reamer in step d can be activated by injecting high-pressure water into the water turbine drive 15 through the water pipe 16. The water turbine drive 15 drives the rock-cutting reamer blade 14 to rotate outward and open. The end of the rock-cutting reamer blade 14 expands to a space range slightly larger than the outer diameter of the first section of the pipe pile 1. While the reaming drill bit 201 rotates, it performs reaming and rock cutting, thereby achieving the effect of reaming and drilling into the rock. After the reaming and drilling into the rock is completed, the drill rod 200 is reversed, and the end of the rock-cutting reamer blade 14 gradually retracts to a space range smaller than the inner diameter of the first section of the pipe pile 1 under the pressure of the slag.

[0040] According to one embodiment of this application, a speed sensor is installed on the drill rod 200 to facilitate monitoring and adjusting the speed of the drill rod 200. A displacement sensor and a pressure sensor are installed on the lifting drive device 3 to facilitate monitoring and adjusting the length of the reaming drill bit 201 extending beyond the bottom of the first section of the pipe pile 1 and the stress state of the drill rod 200 when it enters the rock. An angle sensor is installed on the rock-cutting reaming blade 14 to facilitate monitoring and adjusting the diameter during reaming. All of the above sensors can be equipped with overload alarms. The rotary drive device 4 is a hydraulic gear motor, and the tensioning disc 101... The upper part is provided with a first motor oil pipe 18 and a second motor oil pipe 19 respectively connected to the hydraulic gear motor. When oil enters the first motor oil pipe 18 and oil exits the second motor oil pipe 19, the hydraulic gear motor rotates in the forward direction. When oil exits the first motor oil pipe 18 and oil enters the second motor oil pipe 19, the hydraulic gear motor rotates in the reverse direction. The output shaft of the hydraulic gear motor is connected to a drive gear 20. The upper end of the drill rod 200 is rotatably connected to the housing of the hydraulic gear motor, and a driven gear 21 is provided at the upper end of the drill rod 200. The driven gear 21 meshes with the drive gear 20.

[0041] According to one embodiment of this application, the lifting drive device 3 includes two lifting hydraulic cylinders. The cylinder body of the lifting hydraulic cylinder is connected to the lower end of the tensioning plate 101. The piston rod of the lifting hydraulic cylinder is arranged downward and connected to the housing of the hydraulic gear motor. A first oil pipe 22 and a second oil pipe 23 are provided on the tensioning plate 101. The two lifting hydraulic cylinders share the first oil pipe 22 and the second oil pipe 23 for driving. For example, the rodless chambers of the two lifting hydraulic cylinders are connected to the first oil pipe 22, and the rod chambers of the two lifting hydraulic cylinders are connected to the second oil pipe 23.

[0042] The more specific and detailed process steps for this application are as follows: 1. After the drilling equipment is installed in the first section of pipe pile 1, high-pressure oil is injected into the first positioning and tensioning device 100 and the second positioning and tensioning device 300 to fix the drilling rod 200. The gap between the first section of pipe pile 1 and the drill bit is filled and compacted with dry and hard clay to serve as a temporary sealing bottom.

[0043] 2. In step b, the first section of pipe pile 1 can be pressed into the soil using a static pressure pile driving machine according to the static pressure pile driving construction method. After pressing the first section of pipe pile 1 into the soil, insert the liquid material pipes required for drilling into the second section of the first section of pipe pile 1 (including the first hydraulic oil output pipe 10, the first hydraulic oil return pipe 11, the second hydraulic oil output pipe 12, the second hydraulic oil return pipe 13, the water pipe 16, the first oil pipe 22, and the second oil pipe 23, etc.) into the second section of the first section of pipe pile 1. Lift the second section of the first section of pipe pile 1 to above the first section of pipe pile 1, connect all the liquid material pipes to the liquid material pipes of the lower section using quick couplings, weld the pipe pile flanges, and press the second section of pile pipe into the soil.

[0044] 3. Following the same method, continue to drive in the next section of the first pipe pile 1 in sequence until the first pipe pile 1 is driven into the rock surface, then stop driving the pile.

[0045] 4. Open the hydraulic valve of the hydraulic gear motor and rotate the drill rod 200. After the drill rod 200 speed stabilizes, open the hydraulic valve of the lifting hydraulic cylinder to push out the rotating reaming drill bit 201 in stages. The reaming drill bit 201 first drills into the rock layer with equal diameter.

[0046] 5. High-pressure water is injected into the water turbine driver 15 through the water pipe 16, gradually opening the rock cutting and reaming blade 14 of the rock cutting and reaming device. The rock cutting and reaming blade 14 and the reaming drill bit 201 cut the rock together until the rotation diameter of the rock cutting and reaming blade 14 slightly exceeds the outer diameter of the pile pipe. The high-pressure water injected into the bottom of the pile also has the effect of cooling the drill bit.

[0047] 6. After the rotation diameter of the rock cutting and hole reaming blade 14 and the extension and retraction of the hole reaming drill bit 201 reach the data required for construction, the static pressure string is simultaneously applied. The construction operator monitors the data such as the force, rotation speed and hole reaming diameter of the drill rod 200 at any time to prevent the drill rod 200 and the hole reaming drill bit 201 from operating under overload when the pile driving is too fast, and adjusts the pile driving speed at the same time.

[0048] 7. The cut rock blocks are rotated by the double helical blades 5 and sent to the first material passage 301 of the second positioning and tensioning device 300. The rock blocks enter the grinding chamber through the first material passage 301 and are ground into fine particles by the grinding action of the grinding disc 400.

[0049] 8. Turn on the vacuum slag pump and use the suction pipe to suck the rock debris and water out of the first section of pipe pile 1 and send it to the mud pit.

[0050] 9. After the rock penetration depth and diameter of the pile have reached the design requirements, reverse the drill rod 200. After the rock cutting and hole reaming blade 14 is fully retracted into the hole reaming drill bit 201, use the telescopic device to slowly retract the hole reaming drill bit 201 into the first section of pipe pile 1, press the pile pipe to the bottom of the pile hole, and stop the pile driving after the pile driving is stable.

[0051] 10. After the discharged slag and water become clear under the injection and discharge of high-pressure water and vacuum slag suction pump, stop rotating the drill rod 200 and discharging slag, inject cement grout into the water pipe 16, and perform high-pressure grouting at the bottom of the pile pipe to further improve the bonding strength between the bottom of the pile pipe and the outer wall of the pile and the rock strata.

[0052] 11. After grouting is stopped, release the first positioning tensioning device 100 and the second positioning tensioning device 300 from fixing the first section of pipe pile 1. Use the pile hoist and wire rope to lift the drilling equipment out of the first section of pipe pile 1. If the drilling equipment gets stuck in the first section of pipe pile 1, the drive device 4 can be rotated in reverse to remove the stuck rock cuttings and debris from the drill bit.

[0053] It should be noted that the above embodiments only illustrate preferred embodiments of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting this application. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of this application, such as combining different features in various embodiments, and these should all fall within the protection scope of this application.

Claims

1. A method for constructing enlarged-drill rock-socketed pipe piles, characterized in that, The aforementioned method for constructing rock-socketed pipe piles using expanded drilling equipment is implemented using expanded drilling equipment, which includes: First positioning and tensioning device; A rotary drive device, which is connected below the first positioning and tensioning device; The drill rod has its upper end rotatably connected to the rotary drive device and in transmission cooperation with the power output end of the rotary drive device. The lower part of the drill rod is provided with a hole-reaming component, at least a portion of which can extend downwards out of the lower end of the pipe pile. The method for constructing expanded-drill rock-socketed pipe piles includes the following steps: a. Fix the first positioning and tensioning device to the inner side of the upper end of the first section of pipe pile, so as to install the drilling equipment in the first section of pipe pile; b. Drive the first section of pipe pile into the soil using the static pressure pile driving method. Repeat the operation of connecting the next section of pipe pile to the first section of pipe pile and driving the next section of pipe pile into the soil until the first section of pipe pile reaches the rock surface, then stop driving the pile. c. Allowing at least a portion of the hole-reaming component to extend downwards beyond the lower end of the pipe pile; d. Start the rotary drive device to drive the hole-reaming component to rotate, so that the hole-reaming component cuts the rock.

2. The method for constructing enlarged-drill rock-socketed pipe piles according to claim 1, characterized in that, The reaming implementation component includes a pair of fixed reaming rollers and a pair of movable reaming rollers. The reaming equipment also includes a lifting drive mechanism that is vertically connected to the drill rod. The pair of fixed reaming rollers are fixed to the lower part of the drill rod, and the pair of movable reaming rollers are connected to the lifting drive mechanism. The lifting drive mechanism can drive the pair of movable reaming rollers to extend downwards outwards from the lower end of the pipe pile. When the pair of movable reaming rollers extend downwards outwards from the lower end of the pipe pile, they move outwards relative to each other.

3. The method for constructing enlarged-drill rock-socketed pipe piles according to claim 2, characterized in that, A guide plate is connected to the lower part of the drill rod. An inclined guide groove is formed on the guide plate, which gradually moves downward away from the drill rod. The movable reaming rollers are hinged to the lifting drive mechanism via a hinge rod. A guide post is provided on the hinge rod. The lifting drive mechanism drives the pair of movable reaming rollers to move downward, so that before the guide post enters the inclined guide groove, the pair of movable reaming rollers are limited by the pipe pile and move vertically. When the lifting drive mechanism drives the pair of movable reaming rollers to move downward, so that the guide post enters the inclined guide groove and continues to move along the inclined guide groove, the pair of movable reaming rollers are released from the limitation of the pipe pile and extend downward from the lower end of the pipe pile and move outward relative to each other.

4. The method for constructing enlarged-drill rock-socketed pipe piles according to claim 3, characterized in that, The lifting drive mechanism is a sliding hydraulic cylinder that is mounted on the outer periphery of the drill rod and is capable of sliding along the axial direction of the drill rod.

5. The method for constructing enlarged-drill rock-socketed pipe piles according to claim 1, characterized in that, The hole reaming implementation components include a rock-cutting reamer and a reaming drill bit formed at the lower end of the drill rod. The rock-cutting reamer is positioned on the drill rod adjacent to the reaming drill bit. The reaming equipment also includes a lifting drive device and a second positioning and tensioning device rotatably mounted on the outer periphery of the drill rod. The lifting drive device can drive the rotary drive device to move up and down within the pipe pile, thereby causing the reaming drill bit to extend downwards out of the lower end of the pipe pile or to retract upwards into the pipe pile. The lifting drive device is connected below the first positioning and tensioning device. The second positioning and tensioning device has a plurality of first material passage holes formed on it. The first material passage holes pass through both ends of the second positioning and tensioning device along the axial direction of the drill rod. Step a also includes fixing the second positioning and tensioning device to the inner side of the pipe pile.

6. The method for constructing enlarged-drill rock-socketed pipe piles according to claim 5, characterized in that, The drill rod is provided with double helical blades extending along the axial direction of the drill rod. The bottom of the double helical blades is provided with a plurality of fixed rock cutting teeth near the position of the reaming drill bit. The reaming equipment also includes a slag suction pipe, which passes through both ends of the first positioning and tensioning device along the axial direction of the drill rod. The drilling reaming equipment also includes a grinding disc fitted around the outer periphery of the drill rod. The grinding disc and the drill rod are rotatably limited relative to each other along the outer circumference of the drill rod. The grinding disc has a plurality of second material passage holes formed on it. The second material passage holes pass through both ends of the grinding disc along the axial direction of the drill rod. The grinding disc is positioned above the second positioning and tensioning device at intervals. The lower end of the slag suction pipe is located above the grinding disc. The lower surface of the grinding disc and the upper surface of the second positioning and tensioning device both have a frosted surface. A grinding ball is connected below the grinding disc, and the grinding ball has a frosted surface.

7. The method for constructing enlarged-drill rock-socketed pipe piles according to claim 6, characterized in that, The first positioning and tensioning device includes a plurality of first horizontal hydraulic cylinders, the second positioning and tensioning device includes a plurality of second horizontal hydraulic cylinders, the first positioning and tensioning device includes a tensioning disc, the cylinder body of the first horizontal hydraulic cylinder is integrally formed with the tensioning disc to form a first hydraulic chamber, and a first sliding pressure block is installed in the first hydraulic chamber; The second positioning tensioning device includes a tensioning sleeve, and the cylinder body of the second horizontal hydraulic cylinder is integrally formed with the tensioning sleeve to form a second hydraulic chamber, in which a second sliding pressure block is installed; Step a includes: introducing hydraulic oil into the first hydraulic chamber to drive the first sliding block to move radially outward toward the tensioning disc and press against and secure the upper inner side of the first section of the pipe pile; and introducing hydraulic oil into the second hydraulic chamber to drive the second sliding block to move radially outward toward the tensioning sleeve and press against and secure the inner side of the first section of the pipe pile.

8. The method for constructing enlarged-drill rock-socketed pipe piles according to claim 7, characterized in that, The number of first horizontal hydraulic cylinders is four. These four cylinders are arranged sequentially at 90° intervals along the circumference of the tensioning disc. Two of the first horizontal hydraulic cylinders, located in the same radial direction, have their first sliding blocks connected to their extended ends by two vertically spaced first vertical swing blocks. Each first vertical swing block is hinged to the extended end of the first sliding block via a first hinge shaft arranged horizontally. A first torsion spring is mounted on the first hinge shaft. The torsion spring generates a force that pulls the two first vertical swing blocks together. Introducing hydraulic oil into the first hydraulic chamber corresponding to each first vertical swing block drives the corresponding first sliding block to move radially outward from the tensioning disc, thus allowing the two first vertical swing blocks to overcome the force of the first torsion spring. The first horizontal hydraulic cylinders are pressed together by the force of the springs, opening them apart and pressing them against the inner side of the upper end of the first section of the pipe pile. The extended ends of the first sliding blocks of the other two first horizontal hydraulic cylinders in the same radial direction are connected to two first lateral swing blocks arranged horizontally at intervals. Each first lateral swing block is hinged to the extended end of the first sliding block through a second hinge shaft. The second hinge shaft is arranged in the vertical direction and is provided with a second torsion spring. The second torsion spring generates a force that brings the two first lateral swing blocks together. Hydraulic oil is introduced into the first hydraulic chamber corresponding to the first lateral swing block, which can drive the corresponding first sliding block to move radially outward toward the tensioning disc, so that the two first lateral swing blocks overcome the force of the second torsion springs and are pressed together by the springs, opening them apart and pressing them against the inner side of the upper end of the first section of the pipe pile.

9. The method for constructing enlarged-drill rock-socketed pipe piles according to claim 8, characterized in that, The number of second horizontal hydraulic cylinders is four. These four cylinders are arranged sequentially at 90° intervals along the circumference of the tensioning sleeve. The extended ends of the second sliding blocks of two of the four cylinders, located in the same radial direction, are connected to two second vertically spaced second swing blocks. Each second vertical swing block is hinged to the extended end of a second sliding block via a third hinge shaft arranged horizontally. A third torsion spring is mounted on the third hinge shaft, generating a force that pulls the two second vertical swing blocks together. Introducing hydraulic oil into the second hydraulic chamber corresponding to each second vertical swing block drives the corresponding second sliding block to move radially outward from the tensioning sleeve, thus allowing the two second vertical swing blocks to overcome the force of the first horizontal sliding block. The two second horizontal hydraulic cylinders, which are located in the same radial direction, are connected to two horizontally spaced second lateral swing blocks at their extended ends. Each second lateral swing block is hinged to the extended end of the second sliding block via a fourth hinge shaft. The fourth hinge shaft is arranged vertically and is equipped with a fourth torsion spring. The fourth torsion spring generates a force that brings the two second lateral swing blocks together. Hydraulic oil is introduced into the second hydraulic chamber corresponding to the second lateral swing block, which drives the corresponding second sliding block to move radially outward toward the tension sleeve, so that the two second lateral swing blocks overcome the force of the fourth torsion spring and are pressed together on the inner side of the first section of the pipe pile.

10. The method for constructing enlarged-drill rock-socketed pipe piles according to claim 7, characterized in that, The drilling equipment also includes a docking sleeve, a first hydraulic oil output pipe, a first hydraulic oil return pipe, a second hydraulic oil output pipe, and a second hydraulic oil return pipe, all of which are installed on the tensioning plate. The first hydraulic oil output pipe and the first hydraulic oil return pipe both lead to each of the first hydraulic chambers. The inner side of the sidewall of the docking sleeve is rotatably sealed to the outer circumferential surface of the drill rod. The inner side of the sidewall of the docking sleeve is provided with a first annular groove and a second annular groove. The sidewall of the docking sleeve is provided with a first radial through hole and a second radial through hole. One end of the first radial through hole extends through to the first annular groove, and the other end of the first radial through hole extends through to the outer side of the sidewall of the docking sleeve and is connected to the second hydraulic oil output pipe. One end of the second radial through hole extends through to the second annular groove, and the other end of the second radial through hole extends through to the outer side of the sidewall of the docking sleeve and is connected to the second hydraulic oil return pipe. The inner side of the tensioning sleeve's sidewall is rotatably sealed to the outer circumferential surface of the drill rod. The inner side of the tensioning sleeve's sidewall is provided with a third annular groove and a fourth annular groove. The tensioning sleeve's sidewall is provided with a third radial through hole and a fourth radial through hole. One end of the third radial through hole extends through the third annular groove, and the other end of the third radial through hole extends through the second hydraulic cavity. One end of the fourth radial through hole extends through the fourth annular groove, and the other end of the fourth radial through hole extends through the second hydraulic cavity. The drill pipe is provided with a first oil passage and a second oil passage. The upper port of the first oil passage is connected to the first annular groove, and the lower port of the first oil passage is connected to the third annular groove. The upper port of the second oil passage is connected to the second annular groove, and the lower port of the second oil passage is connected to the fourth annular groove.

Images