A modular assembled hydraulic pile cutting device and its use method

Abstract

The present invention discloses a modular assembled hydraulic pile cutting device and a method for using the same. The pile cutting device comprises a plurality of single hydraulic pile cutting devices arranged in a ring shape, and adjacent single hydraulic pile cutting devices are spliced ​​and fixed; the single hydraulic pile cutting device comprises a steel drill, a guide base, a hydraulic telescopic device, a force transmission device, a one-way moving device and a splicing and fixing device; the guide base comprises a cylindrical body, a guide hole is axially arranged in the cylindrical body, the steel drill is arranged in the guide hole, and the hydraulic telescopic device is arranged on the cylindrical body. The pile cutting device arranges the hydraulic telescopic device and the steel drill into two layers, which can reduce the length of the single hydraulic pile cutting device; moreover, the hydraulic telescopic device is telescoped in multiple times to realize the movement of the steel drill to complete the pile cutting, and a short-stroke hydraulic telescopic device can be selected to further reduce the length of the single hydraulic pile cutting device, thereby reducing the radius of the modular assembled hydraulic pile cutting device, and adapting to construction sites with smaller pile spacing.

Description

Technical Field

[0001] The invention relates to a modular assembly type hydraulic pile cutting device and a use method thereof, belonging to the technical field of underground pile foundations. Background Art

[0002] Concrete cast-in-place piles are a common type of pile foundation, widely used in various construction and infrastructure projects. During the construction of concrete cast-in-place piles, a certain height is often overfilled, and the overfilled part is cut before connecting to the superstructure to ensure the connection quality between the pile foundation and the superstructure. The overfilled part is called the pile head. The traditional pile head processing process usually uses tools such as pneumatic picks to chisel or cut off the pile head manually, and then lift it away with a crane. This has many disadvantages, such as high man-machine investment costs, high construction safety risks, and low mechanization levels.

[0003] At present, some companies have developed simple hydraulic pile cutting devices on the market, which are equipped with several hydraulic devices arranged in a ring. The ends of the hydraulic devices are equipped with steel chisels pointing to the center point of the ring. The hydraulic devices drive the steel chisels to extend and retract to cut the pile. However, when the hydraulic cylinder and the pile cutting chisel are arranged in the same plane, the size of the hydraulic pile cutting device will be too large. For example, if the diameter of the pile is 1m, the diameter of the hydraulic pile cutting device must be more than 3m. In construction sites with small pile spacing, the hydraulic pile cutting device will not be able to enter the construction site. Summary of the invention

[0004] In view of the problem existing in the co-planar arrangement of the existing hydraulic cylinder and the pile-cutting steel chisel, the present invention provides a modular assembled hydraulic pile-cutting device and a method of using the same. By arranging the hydraulic cylinder and the pile-cutting steel chisel in layers, the radius of the hydraulic pile-cutting device is greatly reduced, thereby improving the applicability of the hydraulic pile-cutting device in a construction environment with narrow pile spacing.

[0005] In order to solve the above technical problems, the present invention includes the following technical solutions:

[0006] A modular assembled hydraulic pile cutting device comprises a plurality of single hydraulic pile cutting devices arranged in a ring shape, wherein adjacent single hydraulic pile cutting devices are spliced ​​and fixed;

[0007] The single hydraulic pile cutting device comprises a steel chisel, a guide base, a hydraulic telescopic device, a force transmission device, a one-way moving device and a splicing and fixing device;

[0008] The steel chisel is a cylinder with a pointed tip at one end, and a plurality of annular wedge-shaped tooth sockets are arranged on the cylinder;

[0009] The guide base comprises a cylindrical body, a guide hole is arranged in the cylindrical body along the axial direction, a steel drill is arranged in the guide hole, a tip of the steel drill is located at the front end of the cylindrical body, and a tail of the steel drill extends out of the rear end of the cylindrical body;

[0010] The one-way moving device comprises a first steel drill limit valve seat and a second steel drill limit valve seat sleeved on the steel drill, the second steel drill limit valve seat is fixed to the cylindrical body, and the first steel drill limit valve seat is arranged at the tail of the cylindrical body; the first steel drill limit valve seat and the second steel drill limit valve seat are connected with the steel drill tooth groove buckle;

[0011] The hydraulic telescopic device is arranged on the cylindrical main body, and the force transmission device can transmit the displacement of the telescopic end of the hydraulic telescopic device to the first steel drill limit valve seat. The alternating extension and contraction of the hydraulic telescopic device can make the first steel drill limit valve seat move forward and backward alternately; when the first steel drill limit valve seat moves forward, the first steel drill limit valve seat clamps the steel drill tooth groove and drives the steel drill to move forward. When the first steel drill limit valve seat moves backward, the second steel drill limit valve seat clamps the steel drill tooth groove and keeps the steel drill stationary.

[0012] Furthermore, a first hinge fulcrum is provided at the top of the rear end of the cylindrical body, and a second hinge fulcrum is provided at the bottom of the front end of the cylindrical body;

[0013] The force transmission device includes two power levers, a power pin and two straight connecting rods; a power lever is arranged on each side of the cylindrical body, the bottom of the power lever is hinged to the second hinge fulcrum, and the tops of the two power levers are respectively hinged to the ends of the power pin; one end of the straight connecting rod is hinged to the middle of the power lever, and the other end is hinged to the second steel drill limit valve seat;

[0014] One end of the hydraulic telescopic device is hinged to the first hinge fulcrum, and the other end is hinged to the power pin shaft.

[0015] Furthermore, the first steel drill limit valve seat comprises a circular ring plate and a plurality of limit valves spaced apart and distributed along the inner ring edge of the circular ring plate;

[0016] The middle part of the cylindrical body is hollowed out, and the second steel drill limit valve seat includes a plurality of limit valves arranged in the hollowed-out part of the cylindrical body;

[0017] The limit valve includes a pin shaft, a limit plate and a torsion spring. One end of the limit plate is sleeved on the pin shaft. The torsion spring is arranged on the pin shaft and applies force to the limit plate so that the other end of the limit plate presses the steel chisel and abuts against the annular wedge-shaped tooth groove.

[0018] Furthermore, the first steel drill limit valve seat and the second steel drill limit valve seat both include a circular ring plate and a plurality of limit valves spaced apart and distributed along the inner ring edge of the circular ring plate;

[0019] The limit valve includes a pin shaft, a limit plate and a torsion spring. One end of the limit plate is sleeved on the pin shaft. The torsion spring is arranged on the pin shaft and applies force to the limit plate so that the other end of the limit plate presses the steel chisel and abuts against the annular wedge-shaped tooth groove.

[0020] The middle part of the cylindrical body is hollowed out, the second steel drill limit valve seat is arranged at the hollow part of the cylindrical body, and the annular plate of the second steel drill limit valve seat is fixedly connected to the cylindrical body.

[0021] Furthermore, both sides of the front end of the cylindrical body are provided with horizontal first threaded holes, and the rear end of the cylindrical body is provided with horizontal second threaded holes;

[0022] The splicing and fixing device comprises two first hinged joint screw rods and two second hinged joint screw rods;

[0023] The first hinged joint screw rod comprises a first threaded rod and a first connecting ring arranged at one end of the first threaded rod; the first threaded rod is threadedly connected with the first threaded hole;

[0024] The second hinged joint screw rods each include a second threaded rod and a second connecting ear plate arranged at one end of the second threaded rod; the second threaded rod is threadedly connected to the second threaded hole;

[0025] The first connecting rings of the adjacent single hydraulic pile cutting devices are fixed by pins, and the second connecting ear plates are fixed by pins.

[0026] Accordingly, the present invention also provides a method for using the modular assembled hydraulic pile cutting device, comprising the following steps:

[0027] Step 1: Lift the modular assembled hydraulic pile cutting device and set it on the pile body; in the initial state, the hydraulic expansion device is in a contracted state, and the first steel drill limit valve seat and the second steel drill limit valve seat limit the steel drill tooth groove in one direction;

[0028] Step 2: The hydraulic expansion and contraction device is extended, and the force transmission device pulls the first steel drill limit valve seat to move forward, and the steel drill moves forward synchronously with the first steel drill limit valve seat by M tooth groove spacings, and the second steel drill limit valve seat does not hinder the steel drill from moving forward, where M is a preset value, M≥1;

[0029] Step 3: The hydraulic expansion and contraction device is operated, and the force transmission device pulls the first steel drill limit valve seat to move backward by M tooth groove spacings, and the second steel drill limit valve seat performs one-way limit on the steel drill tooth groove, and the position of the steel drill remains unchanged;

[0030] Step 4: Repeat steps 2 and 3 to gradually move the steel drill forward until the pile body is cut off.

[0031] Due to the adoption of the above technical scheme, the present invention has the following advantages and positive effects compared with the prior art: the modular assembled hydraulic pile cutting device provided by the present invention sets the hydraulic telescopic device and the steel drill into two layers, which can reduce the length of the single hydraulic pile cutting device; moreover, the hydraulic telescopic device is telescoped multiple times to realize the movement of the steel drill to complete the pile cutting, and the hydraulic telescopic device only moves a short distance each time, so a short-stroke hydraulic telescopic device can be selected to further reduce the length of the single hydraulic pile cutting device; in addition, the displacement of the hydraulic telescopic device is transmitted to the second steel drill limit valve seat through the force transmission device, and the power lever can be used to amplify the force of the hydraulic telescopic device, so that a low-power hydraulic telescopic device can be selected. Therefore, the modular assembled hydraulic pile cutting device provided by this embodiment has a smaller radius, can adapt to construction sites with smaller pile spacing, and can reduce costs by selecting a short-stroke, low-power hydraulic telescopic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a modular assembled hydraulic pile cutting device in one embodiment of the present invention;

[0033] Figure 2 It is a structural schematic diagram of a single hydraulic pile cutting device in one embodiment of the present invention;

[0034] Figure 3 It is a structural schematic diagram of a steel drill in one embodiment of the present invention;

[0035] Figure 4 It is a structural schematic diagram of a position limiting guide base in one embodiment of the present invention;

[0036] Figure 5 It is a structural schematic diagram of a hydraulic telescopic device in one embodiment of the present invention;

[0037] Figure 6 It is a structural schematic diagram of a power lever in one embodiment of the present invention;

[0038] Figure 7 is a schematic structural diagram of a straight connecting rod in one embodiment of the present invention;

[0039] Figure 8 It is a structural schematic diagram of a steel drill limit valve seat in one embodiment of the present invention;

[0040] Fig. 9 Schematic diagram of the structure of the articulated joint screw rod in one embodiment of the present invention.

[0041] The numbers in the figure are as follows:

[0042] 1- single hydraulic pile cutting device; 2- first pin shaft; 3- second pin shaft;

[0043] 10-steel chisel; 11-tip; 12-tooth socket;

[0044] 20-guide base; 21-cylindrical body; 22-guide hole; 23-first hinge fulcrum; 24-second hinge fulcrum;

[0045] 30- hydraulic telescopic device; 31- hydraulic cylinder; 32- telescopic rod;

[0046] 40-force transmission device; 41-power lever; 411-first hinge node; 412-second hinge node; 413-third hinge node; 42-power pin shaft; 43-straight connecting rod;

[0047] 50-one-way moving device; 51-first steel drill limit valve seat; 511-circular ring plate; 512-limit valve; 52-second steel drill limit valve seat;

[0048] 60 - splicing and fixing device; 61 - first articulated screw rod; 62 - second articulated screw rod. DETAILED DESCRIPTION

[0049] The following is a further detailed description of a modular assembled hydraulic pile cutting device and a method of using the same provided by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer in conjunction with the following description. It should be noted that the accompanying drawings are in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. Embodiment 1

[0050] like Figure 1 As shown, the modular assembled hydraulic pile cutting device provided in this embodiment includes a plurality of modular single hydraulic pile cutting devices 1 arranged in a ring shape, and adjacent single hydraulic pile cutting devices 1 are spliced ​​and fixed. Figure 1 and Figure 2 As shown, the single hydraulic pile cutting device 1 includes a steel chisel 10 , a guide base 20 , a hydraulic telescopic device 30 , a force transmission device 40 , a one-way moving device 50 and a splicing and fixing device 60 .

[0051] Combination Figures 1 to 3 As shown, the steel drill 10 is a cylinder with a tip 11 at one end, the tip 11 is used to squeeze the pile body, and a plurality of annular wedge-shaped tooth sockets 12 are arranged on the cylinder. As an example, the tip of the steel drill 10 is a cone, and the cylinder is a long cylinder, such as a cylinder with a length of 60 cm and a diameter of 8 cm. The annular wedge-shaped tooth sockets 12 are arranged at equal intervals along the circumference of the cylinder, such as a groove depth of 15 mm, a groove length of 30 mm, and a groove distance of 35 mm. The groove cross section is a right triangle, and the groove slope faces the tip of the steel drill 10.

[0052] Combination Figures 1 to 4As shown, the guide base 20 includes a cylindrical body 21, and a guide hole 22 is axially arranged in the cylindrical body 21. The steel drill 10 is arranged in the guide hole 22 of the limiting guide base 20, and cooperates with the unidirectional moving device 50 to realize the unidirectional movement along the guide hole 22 to load the cut pile. The tip of the steel drill 10 is located at the front end of the cylindrical body 21, and the tail of the steel drill 10 extends out of the rear end of the cylindrical body 21. The guide hole 22 of the cylindrical body 21 is mainly used to place the steel drill 10 and guide the steel drill 10. As an example, the guide hole 22 is slightly larger than the outer diameter of the steel drill 10, such as about 1mm. The steel drill 10 is arranged in the guide hole 22, and the cylindrical body 21 can be hollowed out. A first hinge fulcrum 23 is arranged at the top of the rear end of the cylindrical body 21, and the first hinge fulcrum 23 is used to hinge with one end of the hydraulic telescopic device 30. A second hinge fulcrum 24 is provided at the bottom of the front end of the cylindrical body 21 , and the second hinge fulcrum 24 is used for hinge connection with a power lever described below.

[0053] Combination Figures 1 to 5 As shown, one end of the hydraulic telescopic device 30 is hinged to the first hinge fulcrum 23, and the other end is hinged to the force transmission device 40. The hydraulic telescopic device 30 generally includes a hydraulic cylinder 31 and a telescopic rod 32, and the extension and contraction of the telescopic rod 32 can be remotely controlled. The hydraulic telescopic device 30 can adopt existing technology, which will not be described here. The specific connection method between the hydraulic cylinder 31 and the first hinge fulcrum 23 can be provided by providing a connecting ear plate, a pin hole is provided on the ear plate, and the connection is made through a pin shaft, and other hinge methods can also be adopted.

[0054] Combination Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, the force transmission device 40 mainly transmits the force and displacement of the telescopic rod of the hydraulic telescopic device to the first steel drill limit valve seat described below, and the specific structure of the force transmission device can be set as needed. As an example, the force transmission device 40 includes a power lever 41, a power pin 42 and a straight connecting rod 43. The power lever 41 is a rod body or a plate-shaped rod, and three hinge nodes are arranged at intervals along the length direction on the power lever 41, which are marked as the first hinge node 411, the second hinge node 412 and the third hinge node 413 from bottom to top. A power lever 41 is arranged on each side of the cylindrical body 21, and the first hinge node 411 of the power lever 41 is hingedly arranged with the second hinge fulcrum 24. A power pin 42 is arranged in the third hinge node 413 of the two power levers 41, and one end of the hydraulic telescopic device 30 is hinged with the power pin 42, for example, a pin hole is arranged at the end of the telescopic rod, and the telescopic rod is sleeved on the power pin through the pin hole. A straight connecting rod 43 is disposed on each side of the cylindrical body 21, and one end of the straight connecting rod 43 is hinged to the second hinge node 412 of the power lever 41. When the hydraulic telescopic device 30 is extended or retracted, the power lever 41 rotates around the first hinge node 411 and drives the straight connecting rod 43 to move forward or backward.

[0055] Combination Figures 1 to 8 As shown, the one-way moving device 50 includes a first steel drill limit valve seat 51 and a second steel drill limit valve seat 52. The first steel drill limit valve seat 51 and the second steel drill limit valve seat 52 both limit the steel drill 10 in one direction, that is, prevent the steel drill 10 from moving backward and allow the steel drill 10 to move forward. As an example, the first steel drill limit valve seat 51 includes an annular plate 511, the middle of the annular plate 511 is a circular hole, and a limit valve 512 is respectively arranged at three trisection points on the annular surface. After installation, the limit valve 512 is stuck in the wedge-shaped tooth groove 12 of the steel drill 10 to limit the backward displacement of the steel drill 10. As an example, the limit valve includes a pin shaft, a limit plate and a torsion spring. The limit plate is fan-shaped and is installed on the annular plate 511 through a pin shaft hinge node and can rotate around the pin shaft. The torsion spring is arranged on the pin shaft, and the limit plate is subjected to a force, and the force causes the end of the limit plate to press the steel drill 10 and press against the annular wedge-shaped tooth groove 12. The contact surfaces of the limit valve 512 and the annular plate 511 are respectively designed as protrusions and grooves of the same shape to increase the contact area and optimize the force transmission effect. The second steel drill limit valve seat 52 is arranged in the cylindrical body 21. The structure of the second steel drill limit valve seat 52 can be exactly the same as that of the first steel drill limit valve seat 51. In order to reduce the number of standard parts, the second steel drill limit valve seat 52 can be arranged in the hollow part of the cylindrical body; the second steel drill limit valve seat 52 can also include only 2 or three limit valves, the pin shaft of the limit valve is fixed on the cylindrical body 21, and the setting of the limit plate and the torsion spring is the same as that of the first steel drill limit valve seat 51. The limit plate of the limit valve is against the tooth socket 12, so that the steel drill 10 cannot move backward. When the steel drill 10 moves forward, the limit plate slides and rises along the cross section of the tooth socket 12 until it slides into the next tooth socket 12. Therefore, the limit valve only limits the steel drill 10 in one direction. Of course, the first steel drill limit valve seat 51 and the second steel drill limit valve seat 52 can also use other structural forms in the prior art to limit the steel drill 10, such as using electromagnet technology to control the position of the limit plate, or using a motor and a transmission mechanism to control the opening and closing of the limit plate. The two sides of the annular plate 511 of the first steel drill limit valve seat 51 can be provided with hinged fulcrums, which are hinged to one end of the straight connecting rod 43.

[0056] The splicing and fixing device 60 is mainly used to splice together adjacent single hydraulic pile cutting devices 1. Its specific structure can be set according to needs. For example, connecting ear plates are set on both sides of the cylindrical body 21, and the connecting ear plates of adjacent single hydraulic pile cutting devices 1 are spliced ​​and fixed by pins. This embodiment also provides a highly adaptable splicing and fixing device 60. Figure 1 , Figure 2 , Figure 4 and Fig. 9As shown, first, horizontal first threaded holes are arranged on both sides of the rear end of the cylindrical body 21, such as the first hinge fulcrum 23 is a horizontally arranged round tube with internal threads, and horizontal second threaded holes are arranged on both sides of the front end of the cylindrical body 21, such as the second hinge fulcrum 24 is a horizontally arranged round tube with internal threads. The splicing and fixing device 60 includes two first hinge screws 61 and two second hinge screws 62; the first hinge screw 61 includes a first threaded rod and a first connecting ring arranged at one end of the first threaded rod; the first threaded rod is threadedly connected to the first threaded hole; the second hinge screw 62 includes a second threaded rod and a second connecting ring arranged at one end of the second threaded rod; the second threaded rod is threadedly connected to the second threaded hole; the first connecting rings of the adjacent single hydraulic pile cutting devices 1 are fixed by the first pin 2, and the second connecting rings are fixed by the second pin 3. The insertion lengths of the first threaded rod and the second threaded rod are adjustable, so that all the single hydraulic pile cutting devices 1 can be spliced ​​and fixed according to the preset size, thereby improving the installation accuracy of the equipment.

[0057] The single hydraulic pile cutting device 1 provided in this embodiment sets the hydraulic telescopic device 30 and the steel drill 10 as two layers, which can reduce the length of the single hydraulic pile cutting device 1; moreover, the hydraulic telescopic device 30 is telescoped multiple times to realize the movement of the steel drill 10 to complete the pile cutting, and the hydraulic telescopic device 30 only moves a short distance each time, so a short-stroke hydraulic telescopic device 30 can be selected to further reduce the length of the single hydraulic pile cutting device 1; in addition, the displacement of the hydraulic telescopic device 30 is transmitted to the second steel drill limit valve seat 52 through the force transmission device 40, and the power lever 41 can be used to amplify the force of the hydraulic telescopic device 30, so that a low-power hydraulic telescopic device 30 can be selected. Therefore, the modular assembled hydraulic pile cutting device provided in this embodiment has a smaller radius, can adapt to the construction site with a smaller pile spacing, and can reduce costs by selecting a short-stroke, low-power hydraulic telescopic device 30. Embodiment 2

[0058] This embodiment provides a method for using the modular assembled hydraulic pile cutting device as described in the first embodiment. Figures 1 to 9 The method of use is further described. The method of use comprises the following steps:

[0059] Step 1: Lift the modular assembled hydraulic pile cutting device and set it on the pile body; in the initial state, the hydraulic telescopic device is in a contracted state, and the first steel drill limit valve seat 51 and the second steel drill limit valve seat 52 limit the steel drill 10 tooth groove 12 in one direction;

[0060] Step 2: The hydraulic expansion and contraction device 30 is extended, and the force transmission device 40 pulls the first steel drill limit valve seat 51 to move forward, and the steel drill 10 moves forward synchronously with the first steel drill limit valve seat 51 by the spacing of M tooth grooves 12, and the second steel drill limit valve seat 52 does not hinder the steel drill 10 from moving forward, that is, the end of the limit plate slides from one tooth groove to another tooth groove along the groove slope, where M is a preset value, M≥1;

[0061] Step 3: The hydraulic expansion and contraction device 30 is operated, and the force transmission device 40 pulls the first steel drill limit valve seat 51 to move backward by M tooth grooves 12 spacings, and the second steel drill limit valve seat 52 performs one-way limit on the tooth groove 12 of the steel drill 10, and the position of the steel drill 10 remains unchanged;

[0062] Step 4: Repeat steps 2 and 3 to gradually move the steel drill 10 forward until the pile body is cut off.

[0063] In a specific embodiment, the first steel drill limit valve seat 51 and the second steel drill limit valve seat 52 perform one-way limiting on the tooth groove 12 of the steel drill 10, and the limiting is performed by the fan-shaped limit plate of the limit valve 512 being clamped in the tooth groove 12. The tooth groove 12 has a forward slope and a backward vertical end face. The fan-shaped limit plate presses against the vertical end face to prevent the steel drill 10 from moving backward. When the steel drill 10 moves forward, the limit plate slides along the slope to the next tooth groove 12, thereby achieving one-way limiting of the steel drill 10.

[0064] In a specific embodiment, the specific structure of the force transmission device 40 refers to Example 1. When the hydraulic telescopic device 30 is extended, the power lever 41 rotates counterclockwise along the second hinge node, driving the straight connecting rod 43 to move the first steel drill limit valve seat 51 forward, and the first steel drill limit valve seat 51 drives the steel drill 10 to move forward; when the hydraulic telescopic device 30 is contracted, the power lever 41 rotates clockwise along the second hinge node, driving the straight connecting rod 43 to move the first steel drill limit valve seat 51 backward, and the second steel drill limit valve seat 52 keeps the steel drill 10 stationary.

[0065] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A modular assembled hydraulic pile cutting device, characterized in that: It comprises a plurality of single hydraulic pile cutting devices arranged in a ring shape, and adjacent single hydraulic pile cutting devices are spliced ​​and fixed; The single hydraulic pile cutting device comprises a steel chisel, a guide base, a hydraulic telescopic device, a force transmission device, a one-way moving device and a splicing and fixing device; The steel chisel is a cylinder with a pointed tip at one end, and a plurality of annular wedge-shaped tooth sockets are arranged on the cylinder; The guide base comprises a cylindrical body, a guide hole is arranged in the cylindrical body along the axial direction, a steel drill is arranged in the guide hole, a tip of the steel drill is located at the front end of the cylindrical body, and a tail of the steel drill extends out of the rear end of the cylindrical body; The one-way moving device comprises a first steel drill limit valve seat and a second steel drill limit valve seat sleeved on the steel drill, the first steel drill limit valve seat is arranged at the tail of the cylindrical body, and the second steel drill limit valve seat is fixed to the cylindrical body; the first steel drill limit valve seat and the second steel drill limit valve seat are connected with the steel drill tooth groove buckle; The hydraulic expansion and contraction device is arranged on the cylindrical body, and the force transmission device can transmit the displacement of the expansion and contraction end of the hydraulic expansion and contraction device to the first steel drill limit valve seat, and the alternating extension and contraction of the hydraulic expansion and contraction device can make the first steel drill limit valve seat move forward and backward alternately; when the first steel drill limit valve seat moves forward, the first steel drill limit valve seat clamps the steel drill tooth groove and drives the steel drill to move forward, and when the first steel drill limit valve seat moves backward, the second steel drill limit valve seat clamps the steel drill tooth groove and keeps the steel drill motionless; A first hinge fulcrum is arranged at the top of the rear end of the cylindrical body, and a second hinge fulcrum is arranged at the bottom of the front end of the cylindrical body; The force transmission device includes two power levers, a power pin and two straight connecting rods; a power lever is arranged on each side of the cylindrical body, the bottom of the power lever is hinged to the second hinge fulcrum, and the tops of the two power levers are respectively hinged to the ends of the power pin; one end of the straight connecting rod is hinged to the middle of the power lever, and the other end is hinged to the first steel drill limit valve seat; One end of the hydraulic telescopic device is hinged to the first hinge fulcrum, and the other end is hinged to the power pin shaft.

2. The modular assembled hydraulic pile cutting device according to claim 1, characterized in that: The first steel drill limit valve seat comprises a circular ring plate and a plurality of limit valves spaced apart and distributed along the inner ring edge of the circular ring plate; The middle part of the cylindrical body is hollowed out, and the second steel drill limit valve seat includes a plurality of limit valves arranged in the hollowed-out part of the cylindrical body; The limit valve includes a pin shaft, a limit plate and a torsion spring. One end of the limit plate is sleeved on the pin shaft. The torsion spring is arranged on the pin shaft and applies force to the limit plate so that the other end of the limit plate presses the steel chisel and abuts against the annular wedge-shaped tooth groove.

3. The modular assembled hydraulic pile cutting device according to claim 1, characterized in that: The first steel drill limit valve seat and the second steel drill limit valve seat both include a circular ring plate and a plurality of limit valves spaced apart and distributed along the inner ring edge of the circular ring plate; The limit valve includes a pin shaft, a limit plate and a torsion spring. One end of the limit plate is sleeved on the pin shaft. The torsion spring is arranged on the pin shaft and applies force to the limit plate so that the other end of the limit plate presses the steel chisel and abuts against the annular wedge-shaped tooth groove. The middle part of the cylindrical body is hollowed out, the second steel drill limit valve seat is arranged at the hollow part of the cylindrical body, and the annular plate of the second steel drill limit valve seat is fixedly connected to the cylindrical body.

4. The modular assembled hydraulic pile cutting device according to claim 1, characterized in that: The front end of the cylindrical body is provided with horizontal first threaded holes on both sides, and the rear end of the cylindrical body is provided with horizontal second threaded holes; The splicing and fixing device comprises two first hinged joint screw rods and two second hinged joint screw rods; The first hinged joint screw rod comprises a first threaded rod and a first connecting ring arranged at one end of the first threaded rod; the first threaded rod is threadedly connected with the first threaded hole; The second hinged joint screw rods each include a second threaded rod and a second connecting ear plate arranged at one end of the second threaded rod; the second threaded rod is threadedly connected to the second threaded hole; The first connecting rings of the adjacent single hydraulic pile cutting devices are fixed by pins, and the second connecting ear plates are fixed by pins.

5. The method for using the modular assembled hydraulic pile cutting device according to any one of claims 1 to 4, characterized in that: The steps include: Step 1: Lift the modular assembled hydraulic pile cutting device and set it on the pile body; in the initial state, the hydraulic telescopic device is in a contracted state, and the first steel drill limit valve seat and the second steel drill limit valve seat limit the steel drill in one direction; Step 2: The hydraulic expansion and contraction device is extended, and the force transmission device pulls the first steel drill limit valve seat to move forward, and the steel drill moves forward synchronously with the first steel drill limit valve seat by M tooth groove spacings, and the second steel drill limit valve seat does not hinder the steel drill from moving forward, where M is a preset value, M≥1; Step 3: The hydraulic expansion and contraction device is operated, and the force transmission device pulls the first steel drill limit valve seat to move backward by M tooth groove spacings, and the second steel drill limit valve seat performs one-way limit on the steel drill, and the position of the steel drill remains unchanged; Step 4: Repeat steps 2 and 3 to gradually move the steel drill forward until the pile body is cut off.

Images