Implanting method for prefabricated pipe pile

Abstract

The invention discloses a prefabricated pipe pile implanting method. The method comprises the steps that the position of a target pile foundation of a to-be-implanted prefabricated pipe pile is obtained; drilling is conducted according to the position, an implantation hole is obtained, a hard stratum in the implantation hole is drilled to be broken, and broken stone is dispersed in situ; then the prefabricated pipe pile is inserted into the implanting hole, so that the bottom of the prefabricated pipe pile and the bottom of the implanting hole have preset heights; and finally, after the drill bit of the drill rod penetrates through the central through hole of the prefabricated pipe pile, the prefabricated pipe pile is controlled to move downwards along with downward drilling of the drill bit, so that the prefabricated pipe pile is implanted. According to the method, although the middle digging method is adopted to implant the prefabricated pipe pile, before the prefabricated pipe pile is implanted, the prefabricated drill rod is firstly used for drilling in advance, the diameter of the prefabricated drill rod is not limited by the diameter of the prefabricated pipe pile, the hard stratum is rubbalized in advance, the drilling resistance of hollow digging when the prefabricated pile is implanted is reduced, and the construction efficiency is improved. Implanted prefabricated pipe piles are not affected by geological hardness, and construction reaches the preset depth. Therefore, the middle digging method provided by the invention can adapt to harder complex geology.

Description

Technical Field

[0001] The invention relates to the technical field of prefabricated pipe pile implantation, and in particular to a prefabricated pipe pile implantation method. Background Art

[0002] Precast pipe piles are a type of building structural component that is usually prefabricated in a factory and transported to the site, and then assembled and installed at the construction site. Precast pipe piles are mainly made of reinforced concrete or prestressed concrete and are usually suitable for projects such as bridges, docks, tunnels, highways and high-rise buildings.

[0003] At present, the main construction methods of prefabricated pipe piles are static pressure method, hammer method, mixing method and center excavation method. Among them, static pressure method and hammer method are to squeeze the prefabricated pipe piles directly into the ground by pressure, and the mixing method is to use a drill rod with blades to stir the soil layer and inject cement slurry, and then implant the prefabricated pipe piles, but these three methods are not suitable for harder and complex geology. The center excavation method refers to the process of prefabricated pipe piles being implanted downward, in which a drill rod passes through the central through hole of the prefabricated pipe pile and cuts the stratum in advance, reducing the resistance of the prefabricated pipe piles to be implanted underground. However, due to the inner diameter of the central through hole of the prefabricated pipe pile, the diameter of the drill rod cannot increase with the increase of geological hardness, and the cutting torque that the drill rod can withstand is limited, making it difficult to adapt to harder and complex geology. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a method for implanting prefabricated pipe piles, in which drilling is performed in advance before the mid-excavation method to reduce the influence of geological type on the diameter of the drill rod in the mid-excavation method, thereby solving the technical problem that the existing prefabricated pipe pile implantation method is difficult to adapt to harder and more complex geology.

[0005] To achieve the above object, the present invention provides a method for implanting a prefabricated pipe pile, comprising:

[0006] Obtaining the position of the target pile foundation to be implanted with prefabricated pipe piles;

[0007] Drilling is performed according to the position to obtain an implantation hole, in which the hard ground layer is drilled and the gravel is dispersed in situ;

[0008] Inserting the prefabricated pipe pile into the implantation hole so that the bottom of the prefabricated pipe pile and the bottom of the implantation hole have a preset height;

[0009] After the drill bit of the drill rod passes through the central through hole of the prefabricated pipe pile, the prefabricated pipe pile is controlled to move downward as the drill bit drills downward, so that the prefabricated pipe pile is implanted.

[0010] Preferably, the step of drilling a hole according to the position to obtain an implantation hole comprises:

[0011] The first drill rod is used to drill holes according to the position to obtain implantation holes; the diameter of the first drill rod is greater than or equal to the diameter of the prefabricated pipe pile, and the strength of the first drill rod is greater than that of the drill rod.

[0012] Preferably, the head of the first drill rod is provided with a stone crushing drill bit, and a hole is drilled at the location using the stone crushing drill bit to obtain an implantation hole.

[0013] Preferably, the step of drilling a hole using a first drill rod according to the position to obtain an implantation hole comprises:

[0014] drilling a hole at the location using a first drill rod;

[0015] After the hole is drilled to a preset depth, the current drilling force of the first drill rod is obtained;

[0016] Determine whether the current drilling force reaches the preset drilling force, if so, control the first drill rod to maintain the current rotation speed; if not, increase the current rotation speed of the first drill rod until the current rotation speed matches the current drilling force;

[0017] After the hole is drilled to a set depth of the target pile foundation, the first drill rod is controlled to stop drilling to obtain an implantation hole.

[0018] Preferably, after drilling to a set depth of the target pile foundation, the first drill rod is controlled to stop drilling, and the step of obtaining the implantation hole comprises:

[0019] Obtaining a drill bit position of a first drill rod;

[0020] According to the drill bit position, it is determined whether the current drilling depth is greater than or equal to the set depth of the target pile foundation. If so, the first drill rod is controlled to stop drilling to obtain an implantation hole. If not, the first drill rod is controlled to continue drilling until the drilling depth is greater than or equal to the set depth of the target pile foundation.

[0021] Preferably, between the step of drilling according to the position to obtain an implantation hole, crushing the hard stratum in the implantation hole and dispersing the crushed stones in situ, and the step of inserting the prefabricated pipe pile into the implantation hole so that the bottom of the prefabricated pipe pile and the bottom of the implantation hole have a preset height, the method further includes:

[0022] Obtaining the diameter of the implantation hole;

[0023] Determine the hole diameter and the outer diameter of the prefabricated pipe pile;

[0024] When it is determined that the hole diameter is smaller than the outer diameter of the prefabricated pipe pile, and the difference between the two exceeds a preset difference, the implantation hole is expanded so that the hole diameter of the implantation hole is greater than or equal to the outer diameter of the prefabricated pipe pile;

[0025] When it is determined that the hole diameter is smaller than the outer diameter of the prefabricated pipe pile, and the difference between the two is less than or equal to the preset difference, it is further determined whether the geological hardness around the implantation hole is greater than or equal to the hardness of the prefabricated pipe pile. If not, an extrusion force is applied to the prefabricated pipe pile so that the outer edge of the prefabricated pipe pile squeezes the soil layer around the implantation hole, so that the prefabricated pipe pile is inserted into the implantation hole, and the bottom of the prefabricated pipe pile and the bottom of the implantation hole have a preset height; if so, the implantation hole is expanded so that the hole diameter of the implantation hole is greater than or equal to the outer diameter of the prefabricated pipe pile;

[0026] When it is determined that the hole diameter is greater than or equal to the outer diameter of the prefabricated pipe pile, the step of inserting the prefabricated pipe pile into the implantation hole is performed so that the bottom of the prefabricated pipe pile and the bottom of the implantation hole have a preset height.

[0027] Preferably, as the drill bit drills downward, controlling the prefabricated pipe pile to move downward further comprises:

[0028] As the drill bit drills downward through the implant hole, clear the gravel from the implant hole;

[0029] Spraying the solidified slurry onto the inner wall of the implantation hole;

[0030] The prefabricated pipe pile is controlled to move downward along the inner wall of the implantation hole so that the solidified slurry is filled between the prefabricated pipe pile and the implantation hole.

[0031] Preferably, controlling the prefabricated pipe pile to move downward so as to implant the prefabricated pipe pile comprises:

[0032] The extruded prefabricated pipe pile moves downward along the inner wall of the implantation hole;

[0033] After the prefabricated pipe pile is implanted to the specified depth, the current implantation depth of the prefabricated pipe pile is obtained;

[0034] It is determined whether the current implantation depth is consistent with the set implantation depth. If so, the prefabricated pipe pile is controlled to stop implantation; if not, the prefabricated pipe pile is controlled to continue implantation until the current implantation depth is consistent with the set implantation depth.

[0035] Preferably, the extruded prefabricated pipe pile is moved downward along the inner wall of the implantation hole, comprising:

[0036] The prefabricated pipe pile is pressed downward into the implantation hole using pile-pressing equipment;

[0037] When a preset squeezing force is applied to the prefabricated pipe pile, an actual implantation speed of the prefabricated pipe pile is obtained;

[0038] Determine whether the actual implantation speed is less than the set implantation speed. If so, increase the squeezing force of the pile driving device until the actual implantation speed is consistent with the set implantation speed; if not, maintain the preset squeezing force of the pile driving device.

[0039] Preferably, the head of the drill pipe is provided with an enlarged head, and the enlarged head includes a plurality of radially telescopic expansion rods; after the step of controlling the prefabricated pipe pile to stop implanting, the method includes:

[0040] When the extrusion of the prefabricated pipe pile is to be stopped, obtaining the current extrusion force applied to the prefabricated pipe pile;

[0041] Determine whether the current extrusion pressure is zero. If so, control the drill rod to stop rotating; if not, control the drill rod to continue rotating;

[0042] After the drill rod has slowed down for a preset time, the current rotation speed of the drill rod is obtained;

[0043] Determine whether the current rotation speed is zero. If so, control all the expansion tool rods to shrink and move closer in the radial direction; if not, control all the expansion tool rods to remain radially open;

[0044] After all radial tool rods are contracted and brought together in the radial direction, the diameter of the enlarged head is obtained;

[0045] Determine whether the diameter is smaller than the inner diameter of the prefabricated pipe pile. If so, control the drill rod to retract from the prefabricated pipe pile; if not, control all the expansion cutter rods to continue to shrink and move closer in the radial direction.

[0046] Compared with the background technology, the prefabricated pipe pile implantation method provided by the present invention first obtains the position of the target pile foundation to be implanted with the prefabricated pipe pile; then drills according to the position to obtain an implantation hole, in which the hard stratum is drilled and the gravel is scattered in situ; then the prefabricated pipe pile is inserted into the implantation hole so that the bottom of the prefabricated pipe pile and the bottom of the implantation hole have a preset height; finally, after the drill bit of the drill rod passes through the central through hole of the prefabricated pipe pile, the prefabricated pipe pile is controlled to move downward as the drill bit drills downward, so that the prefabricated pipe pile is implanted.

[0047] Although the present invention also adopts the middle excavation method to implant prefabricated pipe piles, before the middle excavation method is adopted to implant prefabricated pipe piles, the target pile foundation is drilled in advance, and the cutting torque of the drill rod used in the pre-drilling process is not limited by the diameter of the prefabricated pipe pile, so that the diameter of the drill rod is not limited by the diameter of the prefabricated pipe pile, and it can adapt to harder and complex geology; when the middle excavation method is adopted for drilling, the drill rod only needs to drill the gravel in the implantation hole. This method crushes the hard stratum in advance, reduces the drilling resistance of hollow excavation when implanting the prefabricated pipe pile, and makes the implanted prefabricated pipe pile not affected by the geological hardness, and is constructed to a preset depth, which can adapt to harder and complex geology. Therefore, the middle excavation method in the present invention can adapt to harder and complex geology. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0049] Figure 1 A schematic diagram of a process for implanting a prefabricated pipe pile provided in a specific embodiment of the present invention;

[0050] Figure 2 State diagram of drilling pre-implanted holes for prefabricated drill rods;

[0051] Figure 3 is a schematic diagram of a pre-implantation hole;

[0052] Figure 4 The state diagram when the implantation drill rod drills the hole to be implanted and the prefabricated pipe pile is implanted;

[0053] Figure 5 This is a diagram of the implantation status of prefabricated pipe piles.

[0054] The reference numerals are as follows:

[0055] Soft soil layer 011, stone soil layer 012, pebble layer 013, strongly weathered rock layer 014 and moderately weathered rock layer 015;

[0056] Drill rod 1, first drill rod 2, prefabricated pipe pile 3 and implantation hole 4. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0059] The embodiment of the present invention discloses a method for implanting prefabricated pipe piles, which is suitable for relatively hard and complex geology. The complex geology is composed of a 5-meter soft soil layer 011, a 5-meter stone soil layer 012 containing relatively large boulders, a 5-meter pebble layer 013, a 5-meter strongly weathered rock layer 014 and a 5-meter medium weathered rock layer 015 stacked from top to bottom. The prefabricated pipe piles 3 are required to be driven into the medium weathered rock layer 1.5 meters.

[0060] As attached Figure 1As shown, the method for implanting prefabricated pipe piles includes: first, obtaining the position of the target pile foundation to be implanted with the prefabricated pipe pile 3; second, drilling holes according to the position, as shown in the attached Figure 2 As shown, an implantation hole 4 is obtained, the hard stratum in the implantation hole 4 is drilled and the crushed stones are scattered in situ, as shown in the attached Figure 3 As shown; then, the prefabricated pipe pile 3 is inserted into the implantation hole 4, so that the bottom of the prefabricated pipe pile 3 and the bottom of the implantation hole 4 have a preset height; finally, after the drill bit of the drill rod 1 passes through the central through hole of the prefabricated pipe pile 3, as the drill bit drills downward, as shown in the attached Figure 4 As shown, the prefabricated pipe pile 3 is controlled to move downward so that the prefabricated pipe pile 3 is implanted. Figure 5 It should be added that the drill rod 1 is a strong drill rod with a relatively strong structural strength.

[0061] The target pile foundation in this article is obtained before construction according to the load-bearing point planning of the construction object. The construction object can be a basic building such as a bridge, a road or a house. Figure 2 As shown, the gravel generated during the pre-drilling process accumulates in the implantation hole 4. The gravel does not need to be discharged, nor does it need to be protected by casing or mud to prevent the implantation hole 4 from collapsing. The entire pre-drilling process is relatively simple, which can control the construction cost to a certain extent and avoid excessive construction cost.

[0062] In addition, the middle excavation method of the present application adopts a method of pressing and excavating at the same time, so that the prefabricated pipe pile 3 moves down closely following the drill rod 1, and there is no need to support the inner wall of the implantation hole 4, thereby avoiding the collapse of the inner wall of the implantation hole 4 and affecting the construction efficiency, shortening the invalid time and improving the construction efficiency.

[0063] Although the present invention also adopts the middle excavation method to implant the prefabricated pipe pile 3, before the middle excavation method is adopted to implant the prefabricated pipe pile 3, the target pile foundation is drilled in advance, and the cutting torque of the drill rod 1 used in the pre-drilling process is not limited by the diameter of the prefabricated pipe pile 3, and the diameter of the drill rod 1 is not limited by the diameter of the prefabricated pipe pile 3, which can adapt to harder and complex geology; if the drill rod 1 is not drilled in advance, the drill rod 1 used in the conventional middle excavation method can only smoothly penetrate the soft soil layer at most, and once encountering a lone rock, the drill will get stuck; when the middle excavation method is adopted for drilling, the drill rod 1 only needs to drill the gravel in the implantation hole 4. This method crushes the hard stratum in advance, reduces the drilling resistance of the hollow excavation when implanting the prefabricated pipe pile 3, and makes the implanted prefabricated pipe pile 3 not affected by the geological hardness, and is constructed to a preset depth, which can adapt to harder and complex geology. Therefore, the middle excavation method in the present invention can adapt to harder and complex geology.

[0064] The step of drilling a hole according to a position to obtain an implantation hole 4 comprises: drilling a hole according to a position using a first drill rod 2 to obtain an implantation hole 4; the diameter of the first drill rod 2 is greater than or equal to the diameter of the prefabricated pipe pile 3, and the strength of the first drill rod 2 is greater than the strength of the drill rod 1, ensuring that the diameter of the first drill rod 2 is large enough so that the first drill rod 2 has a strong cutting torque and can adapt to harder and more complex geology.

[0065] The head of the first drill rod 2 is provided with a stone crushing drill bit, which is used to drill a hole at the location to obtain an implantation hole 4, so as to improve the drilling efficiency of the first drill rod 2.

[0066] The steps of drilling a hole using the first drill rod 2 according to the position to obtain the implantation hole 4 include: drilling a hole at the position using the first drill rod 2; after drilling to a preset depth, obtaining the current drilling force of the first drill rod 2; judging whether the current drilling force reaches the preset drilling force, if so, controlling the first drill rod 2 to maintain the current rotation speed; if not, increasing the current rotation speed of the first drill rod 2 until the current rotation speed matches the current drilling force; after drilling to the set depth of the target pile foundation, controlling the first drill rod 2 to stop drilling to obtain the implantation hole 4.

[0067] By detecting the drilling force of the first drill rod 2, the rotation speed of the first drill rod is automatically adjusted to ensure that the drilling force of the first drill rod 2 can be adjusted according to the geological type, so that the drilling force and the geological type are always matched, the rock breaking ability of the drill rod 1 is improved, and the drilling efficiency is improved at the same time. As a preferred embodiment, the current drilling force of the first drill rod 2 can be detected and obtained using a pressure sensor. The preset drilling force in this article refers to the optimal drilling force that matches the geological type, which changes with the change of the geological type.

[0068] After the hole is drilled to the set depth of the target pile foundation, the first drill rod 2 is controlled to stop drilling to obtain the implantation hole 4, including: obtaining the drill bit position of the first drill rod 2; judging whether the current drilling depth is greater than or equal to the set depth of the target pile foundation according to the drill bit position, if so, the first drill rod 2 is controlled to stop drilling to obtain the implantation hole 4, if not, the first drill rod 2 is controlled to continue drilling until the drilling depth is greater than or equal to the set depth of the target pile foundation. By real-time detection of the drilling depth of the first drill rod 2, the first drill rod 2 is controlled to stop automatically, with a high degree of automation, avoiding excessive drilling of the first drill rod 2, reducing the risk of the first drill rod 2 being stuck or broken due to excessive rotation, and being conducive to extending the service life of the first drill rod 2. As a preferred embodiment, a depth sensor can be used to detect the drilling depth of the first drill rod 2. The set depth in the text refers to the design depth of the implantation hole 4, which is adjusted according to the construction requirements and is not specifically limited here.

[0069] Between the step of drilling according to the position to obtain the implantation hole 4, the step of crushing the hard stratum in the implantation hole 4 and dispersing the crushed stones in situ, and the step of inserting the prefabricated pipe pile 3 into the implantation hole 4 so that the bottom of the prefabricated pipe pile 3 and the bottom of the implantation hole 4 have a preset height, the method further includes:

[0070] Obtaining the aperture of the implantation hole 4;

[0071] Determine the hole diameter and the outer diameter of the prefabricated pipe pile 3;

[0072] When it is determined that the hole diameter is smaller than the outer diameter of the prefabricated pipe pile 3, and the difference between the two exceeds the preset difference, the implantation hole 4 is expanded to make the hole diameter of the implantation hole 4 greater than or equal to the outer diameter of the prefabricated pipe pile 3;

[0073] When it is determined that the hole diameter is smaller than the outer diameter of the prefabricated pipe pile 3, and the difference between the two is less than or equal to the preset difference, it is further determined whether the geological hardness around the implantation hole 4 is greater than or equal to the hardness of the prefabricated pipe pile 3. If not, an extrusion force is applied to the prefabricated pipe pile 3 so that the outer edge of the prefabricated pipe pile 3 squeezes the soil layer around the implantation hole 4, so that the prefabricated pipe pile 3 is inserted into the implantation hole 4, so that the bottom of the prefabricated pipe pile 3 and the bottom of the implantation hole 4 have a preset height; if so, the implantation hole 4 is expanded so that the hole diameter of the implantation hole 4 is greater than or equal to the outer diameter of the prefabricated pipe pile 3;

[0074] When it is determined that the hole diameter is greater than or equal to the outer diameter of the prefabricated pipe pile 3, the step of inserting the prefabricated pipe pile 3 into the implantation hole 4 is performed so that the bottom of the prefabricated pipe pile 3 and the bottom of the implantation hole 4 have a preset height.

[0075] After drilling the implantation hole 4 and before implanting the prefabricated pipe pile 3, the diameter of the implantation hole 4 is compared with the diameter of the prefabricated pipe pile 3 to ensure smooth implantation of the prefabricated pipe pile 3 and avoid the implantation hole 4 being too small to increase the implantation resistance of the prefabricated pipe pile 3. As a preferred embodiment, the inner diameter of the implantation hole 4 can be obtained by detection by a distance sensor.

[0076] As the drill bit drills downward, the prefabricated pipe pile 3 is controlled to move downward, and the process also includes: as the drill bit drills the implantation hole 4 downward, the gravel in the implantation hole 4 is cleaned; the solidification slurry is sprayed on the inner wall of the implantation hole 4; the prefabricated pipe pile 3 is controlled to move downward along the inner wall of the implantation hole 4, so that the solidification slurry is filled between the prefabricated pipe pile 3 and the implantation hole 4. The gravel in the implantation hole 4 is cleaned to reduce the implantation resistance of the prefabricated pipe pile 3 in the implantation hole 4, thereby improving the implantation efficiency. As a preferred embodiment, the drill rod 1 is equipped with a slag removal device, and the slag removal device is used to remove slag synchronously during the drilling process of the drill rod 1. After the prefabricated pipe pile 3 is implanted, the solidification slurry between the complex geology and the prefabricated pipe pile 3 solidifies, thereby increasing the side friction of the prefabricated pipe pile 3 and ensuring that the prefabricated pipe pile 3 is reliably fixed, thereby increasing the bearing capacity of the prefabricated pipe pile 3. Whether the solidification slurry is used is determined based on the composition of the complex geology.

[0077] Controlling the prefabricated pipe pile 3 to move downward so that the prefabricated pipe pile 3 can be implanted, including: squeezing the prefabricated pipe pile 3 to move downward along the inner wall of the implantation hole 4; after implanting to a specified depth, obtaining the current implantation depth of the prefabricated pipe pile 3; judging whether the current implantation depth is consistent with the set implantation depth, if so, controlling the prefabricated pipe pile 3 to stop implantation; if not, controlling the prefabricated pipe pile 3 to continue implantation until the current implantation depth is consistent with the set implantation depth.

[0078] By real-time detection of the implantation depth of the prefabricated pipe pile 3, the prefabricated pipe pile 3 can be controlled to automatically stop implantation, with a high degree of automation, and the implantation depth of the prefabricated pipe pile 3 can be accurately controlled to ensure that the bearing capacity of the implanted pipe pile meets the design requirements and improve the construction quality. As a preferred embodiment, a depth sensor or a height sensor can be used to detect the implantation depth of the prefabricated pipe pile 3. The set implantation depth in the text refers to the optimal design setting of the prefabricated pipe pile 3, which can be adjusted according to construction requirements.

[0079] Extruding the prefabricated pipe pile 3 to move downward along the inner wall of the implantation hole 4 includes: using a pile driving device to press the prefabricated pipe pile 3 downward into the implantation hole 4; when applying a preset extrusion force to the prefabricated pipe pile 3, obtaining the actual implantation speed of the prefabricated pipe pile 3; judging whether the actual implantation speed is less than the set implantation speed, if so, increasing the extrusion force of the pile driving device until the actual implantation speed is consistent with the set implantation speed; if not, the pile driving device maintains the preset extrusion force.

[0080] In the process of implanting the prefabricated pipe pile 3, the squeezing force applied by the pile driving device to the prefabricated pipe pile 3 is adjusted in real time according to the implantation speed of the prefabricated pipe pile 3, so that the squeezing force applied by the pile driving device to the prefabricated pipe pile 3 changes with the change of geological hardness, and the implantation speed of the prefabricated pipe pile 3 is increased by increasing the squeezing force of the pile driving device, so as to improve the implantation efficiency of the prefabricated pipe pile 3. As a preferred embodiment, a speed sensor is used to detect the implantation speed of the prefabricated pipe pile 3. The set implantation speed in this article refers to the optimal implantation speed that matches the preset squeezing force, and the set implantation speed and the preset squeezing force are paired one by one according to the geological rock formation type and pre-stored in advance. The structure and working principle of the pile driving device can refer to the prior art and will not be described in detail here. The preset squeezing force in this article refers to the optimal squeezing force applied by the pile driving device to the prefabricated pipe pile 3 in the current rock formation, which can be adjusted according to the geological type.

[0081] The head of the drill rod 1 is provided with an enlarged head, which includes a plurality of radially telescopic expansion rods; after the step of controlling the prefabricated pipe pile 3 to stop implanting, the method includes:

[0082] When the extrusion of the prefabricated pipe pile 3 is to be stopped, the current extrusion force applied to the prefabricated pipe pile 3 is obtained;

[0083] Determine whether the current extrusion pressure is zero, if so, control the drill rod 1 to stop rotating; if not, control the drill rod 1 to continue rotating;

[0084] After the drill rod 1 has decelerated for a preset time, the current rotation speed of the drill rod 1 is obtained;

[0085] Determine whether the current rotation speed is zero. If so, control all the expansion tool rods to shrink and move closer in the radial direction; if not, control all the expansion tool rods to remain radially open;

[0086] After all radial tool rods are contracted and brought together in the radial direction, the diameter of the enlarged head is obtained;

[0087] It is determined whether the diameter is smaller than the inner diameter of the prefabricated pipe pile 3. If so, the drill rod 1 is controlled to be withdrawn from the prefabricated pipe pile 3; if not, all the expansion cutter rods are controlled to continue to shrink and move closer in the radial direction.

[0088] After the prefabricated pipe pile 3 stops being implanted, the drill rod 1 automatically stops, and all the expansion cutter bars automatically shrink, and ensure that the diameter of the shrinking expansion head is smaller than the inner diameter of the prefabricated pipe pile 3, so as to avoid interference between the expansion head of the drill rod 1 and the prefabricated pipe pile 3 during the process of withdrawing the drill rod 1. When the drill rod 1 is drilling normally, all the expansion cutter bars remain expanded in the radial direction, and the diameter of the expansion head is larger than the diameter of the prefabricated pipe pile 3, so as to increase the drilling diameter and drilling efficiency of the drill rod 1 and reduce the difficulty of implanting the prefabricated pipe pile 3.

[0089] All the expansion tool rods are hinged to the edge of the circular cutter disc, and a tool rod driving cylinder is connected between each expansion tool rod and the circular cutter disc. The tool rod driving cylinder adjusts the radial angle between the connected expansion tool rods and the central axis of the circular cutter disc by telescoping, so that all the expansion tool rods can be gathered together or separated from each other.

[0090] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0091] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A method for implanting prefabricated pipe piles, characterized in that: include: Obtaining the position of the target pile foundation to be implanted with prefabricated pipe piles; Drilling is performed according to the position to obtain an implantation hole, wherein the hard stratum in the implantation hole is broken up by drilling and the broken stones are dispersed in situ; Inserting the prefabricated pipe pile into the implantation hole so that the bottom of the prefabricated pipe pile and the bottom of the implantation hole have a preset height; After the drill bit of the drill rod passes through the central through hole of the prefabricated pipe pile, the prefabricated pipe pile is controlled to move downward as the drill bit drills downward, so that the prefabricated pipe pile is implanted.

2. The method for implanting prefabricated pipe piles according to claim 1, characterized in that: The step of drilling a hole according to the position to obtain an implantation hole comprises: The implantation hole is obtained by drilling a hole using a first drill rod according to the position; the diameter of the first drill rod is greater than or equal to the diameter of the prefabricated pipe pile, and the strength of the first drill rod is greater than the strength of the drill rod.

3. The method for implanting prefabricated pipe piles according to claim 2, characterized in that: The head of the first drill rod is provided with a stone crushing drill bit, and the stone crushing drill bit is used to drill a hole at the position to obtain an implantation hole.

4. The method for implanting prefabricated pipe piles according to claim 2, characterized in that: The step of drilling a hole using a first drill rod according to the position to obtain an implantation hole comprises: Drilling a hole at the location using the first drill rod; After the hole is drilled to a preset depth, the current drilling force of the first drill rod is obtained; Determine whether the current drilling force reaches the preset drilling force, and if so, control the first drill rod to maintain the current rotation speed; if not, increase the current rotation speed of the first drill rod until the current rotation speed matches the current drilling force; After the hole is drilled to a set depth of the target pile foundation, the first drill rod is controlled to stop drilling to obtain the implantation hole.

5. The method for implanting prefabricated pipe piles according to claim 4, characterized in that: After the hole to be drilled reaches the set depth of the target pile foundation, the step of controlling the first drill rod to stop drilling to obtain the implantation hole comprises: Acquiring a drill bit position of the first drill rod; According to the drill bit position, it is determined whether the current drilling depth is greater than or equal to the set depth of the target pile foundation. If so, the first drill rod is controlled to stop drilling to obtain the implantation hole. If not, the first drill rod is controlled to continue drilling until the drilling depth is greater than or equal to the set depth of the target pile foundation.

6. The method for implanting prefabricated pipe piles according to any one of claims 1 to 5, characterized in that: Between the step of drilling a hole according to the position to obtain an implantation hole, wherein the hard stratum in the implantation hole is drilled and the crushed stones are dispersed in situ, and the step of inserting the prefabricated pipe pile into the implantation hole so that the bottom of the prefabricated pipe pile and the bottom of the implantation hole have a preset height, the method further includes: Obtaining the diameter of the implantation hole; Determine the hole diameter and the outer diameter of the prefabricated pipe pile; When it is determined that the hole diameter is smaller than the outer diameter of the prefabricated pipe pile, and the difference between the two exceeds a preset difference, the implantation hole is expanded so that the hole diameter of the implantation hole is greater than or equal to the outer diameter of the prefabricated pipe pile; When it is determined that the hole diameter is smaller than the outer diameter of the prefabricated pipe pile, and the difference between the two is less than or equal to the preset difference, it is further determined whether the geological hardness around the implantation hole is greater than or equal to the hardness of the prefabricated pipe pile. If not, an extrusion force is applied to the prefabricated pipe pile so that the outer edge of the prefabricated pipe pile squeezes the soil layer around the implantation hole, so as to insert the prefabricated pipe pile into the implantation hole so that the bottom of the prefabricated pipe pile and the bottom of the implantation hole have the preset height; if so, the implantation hole is expanded so that the hole diameter of the implantation hole is greater than or equal to the outer diameter of the prefabricated pipe pile; When it is determined that the hole diameter is greater than or equal to the outer diameter of the prefabricated pipe pile, the step of inserting the prefabricated pipe pile into the implantation hole is performed so that the bottom of the prefabricated pipe pile and the bottom of the implantation hole have a preset height.

7. The method for implanting prefabricated pipe piles according to any one of claims 1 to 5, characterized in that: As the drill bit drills downward, controlling the prefabricated pipe pile to move downward also includes: As the drill bit drills the implantation hole downward, the gravel in the implantation hole is cleaned; spraying the solidified slurry onto the inner wall of the implantation hole; The prefabricated pipe pile is controlled to move downward along the inner wall of the implantation hole so that the solidification slurry is filled between the prefabricated pipe pile and the implantation hole.

8. The method for implanting prefabricated pipe piles according to any one of claims 1 to 5, characterized in that: The step of controlling the prefabricated pipe pile to move downward so as to implant the prefabricated pipe pile comprises: Extruding the prefabricated pipe pile to move downward along the inner wall of the implantation hole; After the prefabricated pipe pile is implanted to a specified depth, the current implantation depth of the prefabricated pipe pile is obtained; It is determined whether the current implantation depth is consistent with the set implantation depth. If so, the prefabricated pipe pile is controlled to stop implantation; if not, the prefabricated pipe pile is controlled to continue implantation until the current implantation depth is consistent with the set implantation depth.

9. The method for implanting prefabricated pipe piles according to claim 8, characterized in that: The step of squeezing the prefabricated pipe pile to move downward along the inner wall of the implantation hole comprises: Using a pile-pressing device to press the prefabricated pipe pile downward into the implantation hole; When a preset squeezing force is applied to the prefabricated pipe pile, an actual implantation speed of the prefabricated pipe pile is obtained; It is determined whether the actual implantation speed is less than the set implantation speed. If so, the squeezing force of the pile driving device is increased until the actual implantation speed is consistent with the set implantation speed; if not, the pile driving device maintains the preset squeezing force.

10. The method for implanting prefabricated pipe piles according to claim 8, characterized in that: The head of the drill rod is provided with an enlarged head, and the enlarged head includes a plurality of radially telescopic expansion rods; After the step of controlling the prefabricated pipe piles to stop implanting, the method further comprises: When the extrusion of the prefabricated pipe pile is to be stopped, obtaining the current extrusion force applied to the prefabricated pipe pile; Determine whether the current extrusion pressure is zero, if so, control the drill rod to stop rotating; if not, control the drill rod to continue rotating; After the drill rod has been decelerated for a preset time, obtaining the current rotation speed of the drill rod; Determine whether the current rotation speed is zero, if so, control all the expansion tool rods to shrink and move closer in the radial direction; if not, control all the expansion tool rods to remain radially open; After all the radial tool rods are contracted and brought together in the radial direction, the diameter of the enlarged head is obtained; It is determined whether the diameter is smaller than the inner diameter of the prefabricated pipe pile. If so, the drill rod is controlled to be retracted from the prefabricated pipe pile; if not, all the expansion cutter rods are controlled to continue to shrink and move closer in the radial direction.

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