Pile cutting fixing device for prefabricated pipe pile and construction method

Abstract

The application discloses a pipe cutting fixing device for prefabricated pipe piles and a construction method, the fixing device comprising a locking mechanism, a pulling mechanism and a cross-shaped support rod, wherein the locking mechanism comprises a low-end rubber plug, an inner support rod, a high-end rubber plug and a separate pulling rope, the pulling mechanism comprises a first pulley, a second pulley, a vertical rod, a horizontal crossbar, a locking pulling rope and a take-up device, the prefabricated pipe pile, the pipe cutting machine, the pipe cutting surface, the mounting surface and the pile top surface are all parts of a construction site, the locking mechanism is used for locking the fixing device on the prefabricated pipe pile, and the pulling mechanism is used for lifting the pipe cutting machine to a specified position for work. The pipe cutting fixing device for prefabricated pipe piles and the construction method can fix the whole device by using the internal space of the prefabricated pipe pile, and can precisely adjust the height of the pipe cutting machine by using the weight of the pipe cutting machine through simple and common materials, so that the cutting surface error is extremely small.

Description

Technical Field

[0001] This invention belongs to the field of building technology, and more specifically, relates to a pile cutting and fixing device and construction method for precast pipe piles. Background Technology

[0002] Precast pipe piles, widely used in building foundation engineering, are extensively employed in residential buildings, municipal engineering, bridge engineering, and industrial plants due to their advantages such as high degree of industrialization in production, fast construction efficiency, and stable load-bearing performance. During the construction of precast pipe piles, the driven piles need to be cut according to the designed pile top elevation to meet the connection requirements between the foundation structure and the superstructure load. The accuracy, safety, and efficiency of the pile cutting construction directly affect the overall quality and construction period of the pile foundation project.

[0003] Currently, the cutting operation of precast pipe piles mainly targets hollow tubular components such as prestressed concrete pipe piles (PCP piles) and prestressed high-strength concrete pipe piles (PHC piles). Among them, prestressed concrete pipe piles (PCP piles) have advantages such as high structural strength, convenient construction, reliable pile quality, and strong adaptability to geological conditions. They mainly adopt the pre-tensioning method, in which the prestressed steel bars are tensioned before the concrete is poured. After the concrete reaches the required strength, the tension is released, and then the concrete is compacted under centrifugal force through a centrifugal process to form a pipe pile. Finally, steam curing is used to improve the concrete strength. Prestressed high-strength concrete pipe piles (PHC piles) are widely used in various projects with high requirements for foundation bearing capacity and durability. They use high-strength concrete (strength grade not lower than C80) as the main material and are internally configured with high-strength prestressed steel wires (or steel strands). The prestressing offsets the tensile stress of the concrete, which greatly improves crack resistance and bearing capacity.

[0004] Its core technical pain points are concentrated in three dimensions: pile body fixation stability, cross-sectional flatness control, and construction safety during the pile cutting process. In terms of pile body fixation stability, the existing fixing devices mainly adopt clamp-type temporary fixing devices and bracket-type support fixing devices. Among them, clamp-type temporary fixing devices have poor adaptability and are prone to damaging the pile body, while bracket-type support fixing devices have limited application scenarios and cannot cope with complex working conditions. Summary of the Invention

[0005] To address the aforementioned deficiencies or improvement needs of existing technologies, this invention provides a pile cutting and fixing device and construction method for precast pipe piles. The device utilizes the internal space of the precast pipe pile for overall fixation, enabling precise adjustment of the pile cutter's height using its own weight. A locking mechanism located at the top of the precast pipe pile secures the entire device. The linkage between the locking mechanism and the pulling mechanism moves the pile cutter to the designated cutting surface, where it cuts the precast pipe pile. Cross-shaped support rods welded to the top surface of the pile ensure the stability of the entire pile cutting and fixing device.

[0006] To achieve the above objectives, according to a first aspect of the present invention, a pile cutting and fixing device for precast pipe piles is provided, comprising: The locking mechanism located at the top of the precast pipe pile includes an inner support rod for locking inside the precast pipe pile, a low-end rubber plug located at one end of the outer side of the inner support rod, and a high-end rubber plug located at the other end of the outer side of the inner support rod; the high-end rubber plug is located above the low-end rubber plug, and the low-end rubber plug and the high-end rubber plug are used to reduce impact and protect the inner support rod. The pulling mechanism connected to the middle of the inner support rod includes a first pulley connected to the middle of the inner support rod, a vertical rod with one end connected to the first pulley and in a vertical direction, a second pulley disposed inside the other end of the vertical rod, and a horizontal crossbar connected to the other end of the vertical rod and in a horizontal direction; the inner support rod can rotate along the first pulley.

[0007] Furthermore, the locking mechanism also includes a release cord disposed on the high-end rubber plug.

[0008] Furthermore, the release cord is made of non-slip nylon braided rope, and the release cord is used to unlock the locking mechanism from its locked state.

[0009] Furthermore, the pulling mechanism also includes a locking rope connected at one end to the lower rubber plug; the locking rope is located inside the vertical rod and the horizontal crossbar and the direction of force is changed by the second pulley.

[0010] Furthermore, the locking rope is made of non-slip nylon braided rope, and the locking rope is used to provide force for the locking mechanism to be locked.

[0011] Furthermore, the pulling mechanism also includes a take-up device connected to the other end of the locking rope and located on top of the pile cutter.

[0012] Furthermore, the take-up device provides tension to move the pile cutter to the required pile cutting surface.

[0013] Furthermore, the horizontal bar can rotate circumferentially along the vertical bar.

[0014] Furthermore, it also includes cross-shaped support rods installed on the top surface of the precast pipe pile; the length of the cross-shaped support rods is determined according to the construction site to ensure the stability of the entire pile cutting and fixing device.

[0015] According to a second aspect of the present invention, a method for fixing precast pipe piles by cutting is provided, which is implemented using a device for fixing precast pipe piles by cutting, comprising: S100: After the precast pipe piles are driven, clean the soil, pile core and debris on the pile body surface, measure the elevation of the pile cut surface with a level instrument and mark the line with a marker pen. S200: Place the cross-shaped support rod stably on the top surface of the pile, place the inner support rod diagonally downward inside the precast pipe pile, and keep the locking rope at the low end position. S300: Tighten the tail take-up device to make the locking pull rope stressed. At this time, the inner support rod will rotate around the first pulley in the vertical direction and make initial contact with the inner wall of the precast pipe pile and clamp it. S400: Loosen the tail retractor until it is placed on the ground and connected to the top of the pile cutter; S500: Tightening the tail retractor lifts the pile cutter off the ground. Under the action of gravity, the inner support rod will wedge tightly with the inner wall of the precast pipe pile. The vertical rods are subjected to vertical force and are located in the center of the precast pipe pile. The whole device is in a stable state under force. S600: Adjust the take-up device to precisely align the saw blade of the pile cutter with the marked line on the pile cutting surface, and lock the take-up device. Start the pile cutter and push it towards the precast pipe pile body to make the initial cut along the marked line. S700: When the required pile cutting depth is reached, the pile cutting machine is pushed horizontally to move around the precast pipe pile. At this time, the horizontal bar will follow the pile cutting machine to rotate around the vertical bar through the first pulley until it rotates 360 degrees to complete the cutting operation of the entire precast pipe pile. S800: After the pile cutting is completed, pull the pile cutter out of the precast pipe pile, turn on the take-up device, place the pile cutter on the ground, and pull the separation rope connected to the high-end rubber plug to make the inner support rod rotate in the opposite direction around the first pulley and separate from the inner wall of the precast pipe pile.

[0016] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects: 1. The device of the present invention utilizes the internal space of the precast pipe pile to fix the entire device, and uses the weight of the pile cutter to precisely adjust the height of the pile cutter. The locking mechanism located at the top of the precast pipe pile fixes the entire device. The linkage between the locking mechanism and the pulling mechanism moves the pile cutter to the designated pile cutting surface, and the pile cutter cuts the precast pipe pile. The stability of the entire pile cutting and fixing device is ensured by the cross-shaped support rods welded to the top surface of the pile.

[0017] 2. The device of the present invention achieves the fixation of the entire device through a locking mechanism located at the top of the precast pipe pile. The locking mechanism is locked inside the precast pipe pile by the low-end rubber plug and the high-end rubber plug being tightly attached to the inner wall of the precast pipe pile. The locking mechanism is unlocked from the inner wall of the precast pipe pile by the separation pull rope installed on the high-end rubber plug.

[0018] 3. The device of the present invention, through the linkage of the locking mechanism and the pulling mechanism, moves the pile cutter to the designated pile cutting surface, and the pile cutter completes the cutting of the precast pipe pile. The locking function of the locking mechanism is controlled by the cooperation of the first pulley and the locking rope. The retractor installed on the top mounting surface of the pile cutter provides the locking force for the locking mechanism and lifts the pile cutter. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the pile cutting and fixing device for precast pipe piles according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the pile cutting and fixing device for precast pipe piles at points A and B, according to an embodiment of the present invention; Figure 3 This is a partial enlarged view of point A of the pile cutting and fixing device for precast pipe piles according to an embodiment of the present invention; Figure 4 This is a partial enlarged view of point B of the pile cutting and fixing device for precast pipe piles according to an embodiment of the present invention; Figure 5 This is a top view of the pile cutting and fixing device for precast pipe piles according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the process for the precast pipe pile cutting and fixing device according to an embodiment of the present invention.

[0020] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1-precast pipe pile, 2-pile cutter, 3-pile cutting surface, 4-installation surface, 5-pile top surface, 6-locking mechanism, 61-low-end rubber plug, 62-inner support rod, 63-high-end rubber plug, 64-separation rope, 7-pulling mechanism, 71-first pulley, 72-second pulley, 73-vertical rod, 74-horizontal crossbar, 75-locking rope, 76-retractor, 8-cross-shaped support rod. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0022] In the description of the embodiments of the present invention, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention 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, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first," "second," and "third" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of the embodiments of the present invention, "multiple" means at least two.

[0025] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0026] This invention provides a pile cutting and fixing device and construction method for precast pipe piles, such as... Figure 1 , Figure 2As shown, the system includes a locking mechanism 6, a pulling mechanism 7, and cross-shaped support rods 8. The precast pipe pile 1, pile cutter 2, pile cutting surface 3, installation surface 4, and pile top surface 5 are part of the construction site. The locking mechanism 6 is placed at the top inside the precast pipe pile 1. One end of the pulling mechanism 7 is connected to the middle of the inner support rod 62 in the locking mechanism 6, and the other end of the pulling mechanism 7 is located outside the precast pipe pile 1 and connected to the pile cutter 2. Multiple cross-shaped support rods 8 (two in this embodiment) are installed on the top outer side of the precast pipe pile 1. The pulling mechanism 7 provides a vertically upward force to the locking mechanism 6, forcing the locking mechanism 6... The precast pipe pile 1 is wedged tightly, and the locking mechanism 6 is locked inside the precast pipe pile 1. After the locking mechanism 6 completes the locking work, the take-up device 76 in the other end of the pulling mechanism 7 starts to work, lifting the pile cutter 2 from the ground to the selected pile cutting surface 3. The pile cutter 2 starts to work and completes the designated cutting of the precast pipe pile 1. The cross-shaped support rod 8 is installed on the top surface 5 of the pile. The outer diameter of the precast pipe pile 1 is usually between 300mm and 1000mm at the construction site. Therefore, the cross-shaped support rod 8 is selected with a length of 1000mm. The cross-shaped support rod 8 is connected by welding process to ensure the stability of the entire pile cutting and fixing device. The device of this invention utilizes the internal space of the precast pipe pile to fix the entire device, and uses the weight of the pile cutter to precisely adjust the height of the pile cutter. The locking mechanism located at the top of the precast pipe pile fixes the entire device. The linkage between the locking mechanism and the pulling mechanism moves the pile cutter to the designated pile cutting surface, and the pile cutter cuts the precast pipe pile. The stability of the entire pile cutting and fixing device is ensured by the cross-shaped support rods welded to the top surface of the pile.

[0027] Specifically, such as Figure 2 , Figure 3As shown, the locking mechanism 6 includes a low-end rubber plug 61, an inner support rod 62, a high-end rubber plug 63, and a separation pull rope 64. A first pulley 71 is installed in the middle of the inner support rod 62. The low-end rubber plug 61 is installed at the lower end of the inner support rod 62, and it is in close contact with the inner wall of the precast pipe pile 1. A locking pull rope 75 is connected to the low-end rubber plug 61. The locking pull rope 75 provides an upward pulling force to the inner support rod 62, causing the low-end rubber plug 61 to rub against the inner wall of the precast pipe pile 1, thereby completing the locking operation. A high-end rubber plug 63 is installed at the higher end, while a low-end rubber plug 61 and a high-end rubber plug 63 are positioned at both ends of the inner support rod 62 to buffer and protect it. They also possess a certain degree of flexibility, allowing for better contact with the inner wall of the precast pipe pile 1, thus achieving a better fixing effect. A separation pull rope 64 is connected to the high-end rubber plug 63. The separation pull rope 64 is made of anti-slip nylon braided rope. After the work is completed, the separation pull rope 64 provides upward pulling force, causing the low-end rubber plug 61 and the high-end rubber plug 63 in the locking mechanism 6 to disengage from the inner wall of the precast pipe pile 1, thereby ending the locking operation. The device of this invention uses a locking mechanism located at the top inside the precast pipe pile to fix the entire device. The low-end and high-end rubber plugs are tightly attached to the inner wall of the precast pipe pile, locking the locking mechanism inside the precast pipe pile. The separation pull rope installed on the high-end rubber plug unlocks the locking mechanism from the inner wall of the precast pipe pile.

[0028] Specifically, such as Figure 3 , Figure 4As shown, the pulling mechanism 7 includes a first pulley 71, a second pulley 72, a vertical rod 73, a horizontal crossbar 74, a locking rope 75, and a take-up device 76. The first pulley 71 is installed in the middle of the inner support rod 62, allowing the inner support rod 62 to rotate in a vertical plane under the drive of the first pulley 71. The first pulley 71 is also installed at the bottom end of the vertical rod 73, and the second pulley 72 is installed at the top end of the vertical rod 73. The second pulley 72 is also installed at one end of the horizontal crossbar 74, which can rotate 360 ​​degrees around the vertical rod 73. A locking rope 75 is located inside the vertical rod 73 and the horizontal crossbar 74, locking the pull... Rope 75 is made of anti-slip nylon braided rope. One end of the locking rope 75 is connected to the low-end rubber plug 61, and the other end is connected to the take-up device 76. The take-up device 76 is installed on the mounting surface 4 on the top of the pile cutter 2. Under the action of the take-up device 76, the locking rope 75 applies an upward pulling force to the low-end rubber plug 61 through the action of the second pulley 72, thereby driving the inner support rod 62 to rotate around the first pulley 71. This causes the low-end rubber plug 61 and the high-end rubber plug 63 to be tightly attached to the inner wall of the precast pipe pile 1 to achieve the locking function of the locking mechanism 6. After the locking mechanism 6 has completed locking, the take-up device 76 provides an upward pulling force, driving the pile cutter 2 to move upward until the pile cutter 2 moves to the designated pile cutting surface 3 position. The device of the present invention moves the pile cutter to a designated pile cutting surface through the linkage of the locking mechanism and the pulling mechanism, and the pile cutter completes the cutting of the precast pipe pile. The locking function of the locking mechanism is controlled by the cooperation of the first pulley and the locking rope. The retractor installed on the top mounting surface of the pile cutter provides the locking force for the locking mechanism and lifts the pile cutter.

[0029] like Figure 6 As shown, multiple cross-shaped support rods 8 are welded and installed on the top surface 5 of the precast pipe pile 1 to ensure the stability of the pile cutting and fixing device. The selection of cross-shaped support rods 8 is based on the precast pipe pile 1. In on-site construction, the outer diameter of the precast pipe pile 1 is 300mm-1000mm. Therefore, the length of the cross-shaped support rod 8 is selected to be 1000mm. The cross-shaped support rod 8 must be made of high-strength metal material, and it is necessary to ensure that the welding point is not loosened or broken after the welding process. At the same time, the contact between the cross-shaped support rod 8 and the top surface 5 of the pile must be stable to ensure that the force is evenly transmitted to the top of the precast pipe pile 1 and to prevent local stress concentration from causing damage to the top surface 5.

[0030] As a preferred embodiment, in some other embodiments, in complex construction environments, the inner support rod 62 in the locking mechanism 6 may not be able to tightly fit the lower rubber plug 61 and the upper rubber plug 63 of the inner support rod 62 against the inner wall of the precast pipe pile 1 due to factors such as residual concrete protrusions and cracks on the inner wall of the precast pipe pile 1, thus reducing the locking stability. Therefore, detachable replacement mounting pieces are designed at both ends of the inner support rod 62, and the lower rubber plug 61 and the upper rubber plug 63 are installed on the corresponding replacement mounting pieces. The replacement mounting pieces are designed with contours and are designed according to the actual shape of the precast pipe pile 1.

[0031] As a preferred embodiment, in some other embodiments, both the separating pull rope 64 and the locking pull rope 75 are made of non-slip nylon braided rope to adapt to the weather and reduce the risk of rope breakage. An external separating guide rail mechanism can also be added. When using the separating pull rope 64, the separating guide rail is placed on the top surface 5 of the precast pipe pile 1, the separating pull rope 64 is placed inside the separating guide rail, and then the separating pull rope 64 is pulled to unlock the locking mechanism 6. A locking guide rail is designed in the vertical rod 73 and the horizontal crossbar 74, and the locking pull rope 75 is placed inside the locking guide rail. The surfaces of the separating guide rail and the locking guide rail are coated with a wear-resistant coating. The coating can be a silicone resin coating or a wax composite coating to reduce the "biting" effect during friction.

[0032] like Figure 6 As shown, in another embodiment of the present invention, a method for fixing precast pipe piles is provided, comprising the following steps: After the precast pipe pile 1 is driven, clean the soil, pile core and debris on the pile body surface of the precast pipe pile 1, and use a level to measure the elevation of the pile cut surface 3, and mark the line with a marker pen.

[0033] Place the cross-shaped support rod 8 stably on the top surface 5 of the pile, place the inner support rod 62 diagonally downward inside the precast pipe pile 1, and keep the locking rope 75 at the low end position.

[0034] Tighten the tail retractor 76 to apply force to the locking rope 75. At this time, the inner support rod 62 will rotate around the first pulley 71 in the vertical direction and make initial contact with the inner wall of the precast pipe pile 1 and lock it in place.

[0035] Loosen the tail retractor 76 until it is placed on the ground and connected to the top of the pile cutter 2.

[0036] The tail retractor 76 lifts the pile cutter 2 off the ground. Under the action of gravity, the inner support rod 62 will be wedged tightly against the inner wall of the precast pipe pile 1. The vertical rod 73 is subjected to vertical force and is located at the center of the precast pipe pile 1. The whole set of equipment is in a stable state under force.

[0037] Adjust the take-up reel 76 to precisely align the saw blade of the pile cutter 2 with the marked line on the pile cutting surface, and lock the take-up reel 76. Start the pile cutter 2 and push it towards the pile body of the precast pipe pile 1 to make the initial cut along the marked line.

[0038] Once the required cutting depth is reached, the pile cutter 2 is pushed horizontally to move around the precast pipe pile 1. At this time, the horizontal bar will follow the pile cutter 2 to rotate around the vertical member 73 via the first pulley 71 until it rotates 360 degrees to complete the cutting operation of the entire precast pipe pile 1.

[0039] After the pile cutting is completed, the pile cutting machine 2 is pulled out from the precast pipe pile 1, and the take-up cable 76 is turned on. The pile cutting machine 2 is placed on the ground, and the separation rope 64 connected to the high-end rubber plug 63 is pulled, so that the inner support rod 62 rotates in the opposite direction around the first pulley 71 and separates from the inner wall of the precast pipe pile 1.

[0040] Repeat the above process to continue cutting the next precast pipe pile 1.

[0041] In summary, the precast pipe pile cutting and fixing device and construction method can utilize the internal space of the precast pipe pile to fix the entire device. Using simple and common materials, the height of the pile cutting machine can be precisely adjusted by the weight of the pile cutting machine itself, resulting in minimal cutting surface error.

[0042] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pile cutting and fixing device for precast pipe piles, characterized in that, include: The locking mechanism (6) located at the top of the precast pipe pile (1) includes an inner support rod (62) for locking inside the precast pipe pile (1), a low-end rubber plug (61) located at one end of the outer side of the inner support rod (62), and a high-end rubber plug (63) located at the other end of the outer side of the inner support rod (62); the high-end rubber plug (63) is located above the low-end rubber plug (61), and the low-end rubber plug (61) and the high-end rubber plug (63) are used to reduce impact and protect the inner support rod (62); The pulling mechanism (7) connected to the middle of the inner support rod (62) includes a first pulley (71) connected to the middle of the inner support rod (62), a vertical rod (73) connected to the first pulley (71) at one end and in a vertical direction, a second pulley (72) located inside the other end of the vertical rod (73), a horizontal crossbar (74) connected to the other end of the vertical rod (73) and in a horizontal direction, a locking rope (75) connected to the lower rubber plug (61) at one end, and a take-up device (76) connected to the other end of the locking rope (75) and located at the top of the pile cutter (2); the inner support rod (62) can rotate along the first pulley (71).

2. The pile cutting and fixing device for precast pipe piles according to claim 1, characterized in that, The locking mechanism (6) also includes a separation pull rope (64) disposed on the high-end rubber plug (63).

3. The pile cutting and fixing device for precast pipe piles according to claim 2, characterized in that, The separation pull rope (64) is made of non-slip nylon braided rope and is used to unlock the locking mechanism (6) from its locked state.

4. The pile cutting and fixing device for precast pipe piles according to claim 3, characterized in that, The locking rope (75) is located inside the vertical rod (73) and the horizontal crossbar (74) and the direction of force is changed by the second pulley (72).

5. A pile cutting and fixing device for precast pipe piles according to claim 4, characterized in that, The locking cord (75) is made of non-slip nylon braided rope and is used to provide force for the locking mechanism (6) to lock.

6. A pile cutting and fixing device for precast pipe piles according to claim 5, characterized in that, The take-up device (76) provides tension to move the pile cutter (2) to the required pile cutting surface (3).

7. A pile cutting and fixing device for precast pipe piles according to claim 6, characterized in that, The horizontal bar (74) can rotate in a circle along the vertical bar (73).

8. A pile cutting and fixing device for precast pipe piles according to any one of claims 1-7, characterized in that, It also includes cross-shaped support rods (8) installed on the top surface (5) of the precast pipe pile (1); the length of the cross-shaped support rods (8) is determined according to the construction site to ensure the stability of the entire pile cutting and fixing device.

9. A method for fixing precast pipe piles during pile cutting, characterized in that, The method employs the pile cutting and fixing device for precast pipe piles as described in any one of claims 1-8, comprising: S100: After the precast pipe pile (1) is driven, clean the soil, pile core and pile top debris on the surface of the precast pipe pile (1), measure the elevation of the cut surface (3) with a level instrument, and mark the line with a marker pen. S200: Place the cross-shaped support rod (8) steadily on the top surface of the pile (5), place the inner support rod (62) diagonally downward inside the precast pipe pile (1), and keep the locking rope (75) at the low end position; S300: Tighten the tail take-up device (76) so that the locking pull rope (75) is under force. At this time, the inner support rod (62) will rotate around the first pulley (71) in the vertical direction and make initial contact with the inner wall of the precast pipe pile (1) and clamp it. S400: Loosen the tail reel (76) until it is placed on the ground and connected to the top of the pile cutter (2); S500: Tighten the tail retractor (76) to lift the pile cutter (2) off the ground. Under the action of gravity, the inner support rod (62) will wedge tightly with the inner wall of the precast pipe pile (1). The vertical rod (73) is subjected to vertical force and is located in the center of the precast pipe pile (1). The whole set of equipment is in a stable state of force. S600: Adjust the take-up device (76), precisely level the saw blade of the pile cutter (2) with the mark line of the pile cutting surface, and lock the take-up device (76). Start the pile cutter (2), push it towards the pile body of the precast pipe pile (1), and make the first cut along the mark line of the pile cutting. S700: When the required pile cutting depth is reached, the pile cutting machine (2) is pushed horizontally to move around the precast pipe pile (1). At this time, the horizontal bar will follow the pile cutting machine (2) to rotate around the vertical bar (73) through the first pulley (71) until it rotates 360 degrees to complete the cutting operation of the entire precast pipe pile (1). S800: After the pile cutting is completed, pull the pile cutter (2) out of the precast pipe pile (1) and turn on the take-up device (76). Place the pile cutter (2) on the ground and pull the separation rope (64) connected to the high-end rubber plug (63) so that the inner support rod (62) rotates in the opposite direction around the first pulley (71) and separates from the inner wall of the precast pipe pile (1).

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