A hydraulic pile cutting device unit and a method of using the same

Abstract

This invention discloses a hydraulic pile cutting device unit and its usage method. The hydraulic pile cutting device unit includes a steel rod, a guide base, a movable seat, a hydraulic telescopic device, a force transmission device, and a unidirectional movement device. The steel rod is cylindrical and has several annular wedge-shaped grooves. The guide base includes a cylindrical body with a guide hole arranged axially inside the cylindrical body. The steel rod is placed in the guide hole, and the hydraulic telescopic device is mounted on the cylindrical body. The unidirectional movement device includes several first limit valves and second limit valves. The hydraulic pile cutting device unit sets the hydraulic telescopic device and the steel rod in two layers, which can reduce the length of the hydraulic pile cutting device unit. Moreover, the hydraulic telescopic device moves the steel rod by extending and retracting multiple times, allowing for the selection of short-stroke hydraulic telescopic devices, further reducing the length of the hydraulic pile cutting device unit and adapting to construction sites with small pile spacing.

Description

Technical Field

[0001] This invention relates to a hydraulic pile cutting device unit and its usage method, belonging to the field of underground pile foundation technology. Background Technology

[0002] Cast-in-place concrete piles are a common type of pile foundation, widely used in various building and infrastructure projects. During construction, cast-in-place concrete piles are often over-poured to a certain height. Before connection with the superstructure, the over-poured portion is cut off to ensure the quality of the connection between the pile foundation and the superstructure. The over-poured portion is called the pile head. Traditional pile head removal methods typically involve manually chiseling or cutting off the pile head using tools such as pneumatic picks, followed by hoisting it away with a crane. This method has many drawbacks, including high labor and machinery costs, significant construction safety risks, and low levels of mechanization.

[0003] Currently, some companies have developed simple hydraulic pile-cutting devices on the market. These devices consist of several hydraulic cylinders arranged in a ring, with a steel chisel at the end of each cylinder pointing towards the center of the ring. The hydraulic cylinders extend and retract to cut the pile. However, when the hydraulic cylinders and the cutting chisel are arranged on the same plane, the hydraulic pile-cutting device becomes too large. For example, if the pile diameter is 1m, the diameter of the hydraulic pile-cutting device needs to be over 3m. In construction sites with small pile spacing, this can prevent the hydraulic pile-cutting device from being used. Summary of the Invention

[0004] To address the problems associated with existing hydraulic cylinders and pile-cutting steel rods arranged on the same plane, this invention provides a hydraulic pile-cutting device unit and its usage method. By arranging the hydraulic cylinders and pile-cutting steel rods in layers, the size of the hydraulic pile-cutting device unit that makes up the hydraulic pile-cutting device is greatly reduced, thus enabling it to adapt to construction environments with narrow pile spacing.

[0005] To solve the above technical problems, the present invention includes the following technical solutions:

[0006] A hydraulic pile cutting device unit includes a steel chisel, a guide base, a movable seat, a hydraulic telescopic device, a force transmission device, and a unidirectional movement device;

[0007] The steel rod is a cylinder with a pointed end, and several annular wedge-shaped grooves are provided on the cylinder.

[0008] The guide base includes a cylindrical body with a guide hole arranged axially inside the cylindrical body. A steel rod is placed in the guide hole, with the tip of the steel rod located at the front end of the cylindrical body and the tail end of the steel rod extending out of the rear end of the cylindrical body. A hollow part is provided on the cylindrical body.

[0009] The movable seat is located at the tail of the guide base, with a through hole in the middle and fitted onto the tail of the steel rod;

[0010] The one-way moving device includes several first limit valves and second limit valves. The first limit valves are set on the movable base, and the second limit valves are set in the hollow part of the cylindrical body. Both the first limit valves and the second limit valves are connected to the groove of the steel rod with a snap-fit, which can prevent the steel rod from moving backward.

[0011] The hydraulic telescopic device is installed on the cylindrical body. The force transmission device can transmit the displacement of the telescopic end of the hydraulic telescopic device to the movable seat. The telescopic extension and retraction of the hydraulic telescopic device can drive the movable seat to move back and forth. When the movable seat moves forward, the first limit valve locks the groove of the steel rod and pushes the steel rod forward. When the movable seat moves backward, the second limit valve locks the groove of the steel rod and keeps the steel rod 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, one power pin, and two straight connecting rods; one power lever is set on each side of the cylindrical body, the bottom of the power lever is hinged to the second hinge fulcrum, and the top of the two power levers are respectively hinged to the end 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 movable 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.

[0015] Furthermore, both the first limit valve and the second limit valve include a pin, a limit plate, and a torsion spring. One end of the limit plate is sleeved on the pin, and the torsion spring is set on the pin. The pin of the first limit valve is set on the movable seat, and the pin of the second limit valve is set on the cylindrical body. The torsion spring causes the end of the limit plate to press against the steel rod and abut against the annular wedge-shaped groove.

[0016] Furthermore, 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.

[0017] The first threaded hole is provided with a first hinged joint screw, and the second threaded hole is provided with a second hinged joint screw;

[0018] The first hinged joint screw includes a first threaded rod and a first connecting ring disposed at one end of the first threaded rod; the first threaded rod is threadedly connected to a first threaded hole.

[0019] The second hinge joint screw includes a second threaded rod and a second connecting lug plate disposed at one end of the second threaded rod; the second threaded rod is threadedly connected to the second threaded hole.

[0020] Accordingly, the present invention also provides a method of using the aforementioned hydraulic pile-cutting device unit, comprising the following steps:

[0021] Step 1: In the initial state, the hydraulic telescopic device is in the retracted state, and the first limit valve and the second limit valve limit the steel chisel groove in one direction.

[0022] Step 2: Extend the hydraulic telescopic device. The force transmission device pulls the movable seat forward. The steel rod moves forward synchronously with the first limit valve by M tooth spacings. The second limit valve does not obstruct the forward movement of the steel rod. M is a preset value, M≥1.

[0023] Step 3: The hydraulic telescopic device retracts, the force transmission device pulls the movable seat backward, the first limit valve moves backward simultaneously by M tooth spacing, and the second limit valve unidirectionally limits the tooth spacing of the steel rod, so that the position of the steel rod remains unchanged.

[0024] Step 4: Repeat steps 2 and 3 to move the steel rod forward gradually.

[0025] The present invention, by adopting the above technical solution, has the following advantages and positive effects compared with the prior art: The hydraulic pile cutting device unit provided by the present invention sets the hydraulic telescopic device and the steel rod in two layers, which can reduce the length of the hydraulic pile cutting device unit; moreover, the hydraulic telescopic device achieves pile cutting by moving the steel rod in multiple extensions and retractions, and the hydraulic telescopic device only moves a very short distance each time, so a short-stroke hydraulic telescopic device can be selected, further reducing the length of the hydraulic pile cutting device unit; in addition, the displacement of the hydraulic telescopic device is transmitted to the second steel rod limit valve seat through the force transmission device, and the force of the hydraulic telescopic device can be amplified by the power lever, so a low-power hydraulic telescopic device can be selected. Therefore, the hydraulic pile cutting device unit provided in this embodiment has a smaller radius, can adapt to construction sites with small pile spacing, and can reduce costs by selecting a short-stroke, low-power hydraulic telescopic device. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a hydraulic pile-cutting device unit in one embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of a steel rod in one embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the limiting guide base and the second limiting valve in one embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of the movable seat and the first limiting valve in one embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of a hydraulic telescopic device according to an embodiment of the present invention;

[0031] Figure 6This is a schematic diagram of the structure of the power lever in one embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the straight connecting rod in one embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of eight hydraulic pile cutting device units assembled to form a hydraulic pile cutting device in one embodiment of the present invention;

[0034] Figure 9 This is a schematic diagram of the structure of the first hinge joint screw and the second hinge joint screw in one embodiment of the present invention.

[0035] The numbers in the diagram are as follows:

[0036] 1-Hydraulic pile cutting device unit;

[0037] 10-Steel chisel; 11-Tip; 12-Glandular groove;

[0038] 20-Guide base; 21-Cylindrical body; 22-Guide hole; 23-First hinge point; 24-Second hinge point;

[0039] 30 - Hydraulic telescopic device; 31 - Hydraulic cylinder; 32 - Telescopic rod;

[0040] 40 - Force transmission device; 41 - Power lever; 411 - First hinge node; 412 - Second hinge node; 413 - Third hinge node; 42 - Power pin; 43 - Straight connecting rod;

[0041] 50 - Movable seat; 51 - Third hinge point;

[0042] 60 - One-way moving device; 61 - First limit valve; 62 - Second limit valve;

[0043] 70 - Splicing and fixing device; 71 - First hinge joint screw; 72 - Second hinge joint screw. Detailed Implementation

[0044] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a hydraulic pile-cutting device unit and its usage method provided by the present invention. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0045] Example 1

[0046] like Figure 1As shown, the hydraulic pile cutting device unit provided in this embodiment includes a steel chisel 10, a guide base 20, a hydraulic telescopic device 30, a force transmission device 40, a movable seat 50, and a one-way moving device 60.

[0047] Combination Figure 1 and Figure 2 As shown, the steel rod 10 is a cylinder with a pointed tip 11 at one end. The pointed tip 11 is used to compress the pile body. Several annular wedge-shaped grooves 12 are provided on the cylinder. For example, the tip of the steel rod 10 is conical, and the cylinder is a long cylinder, such as a cylinder with a length of 40cm and a diameter of 5cm. The annular wedge-shaped grooves 12 are evenly spaced along the circumference of the cylinder. The groove cross-section is a right-angled triangle, with one side being the groove slope and the other side being the groove end face. The groove slope faces the tip of the steel rod 10. For example, the groove depth is 10mm, the groove length is 20mm, and the groove spacing is 35mm.

[0048] Combination Figures 1 to 3 As shown, the guide base 20 includes a cylindrical body 21. A guide hole 22 is axially arranged inside the cylindrical body 21. The steel rod 10 is disposed in the guide hole 22 of the limiting guide base 20 and cooperates with the unidirectional moving device 60 to achieve unidirectional movement along the guide hole 22. The tip of the steel rod 10 is located at the front end of the cylindrical body 21, and the tail of the steel rod 10 extends beyond the rear end of the cylindrical body 21. The guide hole 22 of the cylindrical body 21 is mainly used to place the steel rod 10 and guide it. For example, the guide hole 22 is slightly larger than the outer diameter of the steel rod 10, for example, about 1 mm. The cylindrical body 21 can be hollowed out when the steel rod 10 is disposed inside the guide hole 22. A first hinge point 23 is provided at the top of the rear end of the cylindrical body 21. The first hinge point 23 is used to hinge with one end of the hydraulic telescopic device 30. The bottom front end of the cylindrical body 21 is provided with a second hinge point 24, which is used to hinge with the power lever mentioned below.

[0049] Combination Figure 1 and Figure 4 As shown, the movable seat is a circular ring plate with a through hole in the middle for mounting on a steel rod. The movable seat is provided with a third hinge fulcrum 51 for hinged connection with the force transmission device 40.

[0050] Combination Figure 1 and Figure 5 As shown, one end of the hydraulic telescopic device 30 is hinged to the first hinge point 23, and the other end is hinged to the force transmission device 40. The hydraulic telescopic device 30 typically includes a hydraulic cylinder 31 and a telescopic rod 32, allowing remote control of the extension and retraction of the telescopic rod 32. The hydraulic telescopic device 30 can utilize existing technology, which will not be elaborated here. The specific connection method between the hydraulic cylinder 31 and the first hinge point 23 can be achieved by setting a connecting lug plate with pin holes for pin connection, or by using other hinge methods.

[0051] Combination Figure 1 , Figures 3 to 7 As shown, the force transmission device 40 mainly transmits the force and displacement of the telescopic rod of the hydraulic telescopic device 30 to the movable seat 50. The specific structure of the force transmission device can be set as needed. For example, the force transmission device 40 includes a power lever 41, a power pin 42, and a direct connecting rod 43. The power lever 41 is a rod or plate-shaped member, and three hinge nodes are arranged at intervals along the length direction of the power lever 41, which are labeled as the first hinge node 411, the second hinge node 412, and the third hinge node 413 from bottom to top. One 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 hinged to the second hinge fulcrum 24. The third hinge node 413 of the two power levers 41 is provided with a power pin 42, and one end of the hydraulic telescopic device 30 is hinged to the power pin 42. For example, the end of the telescopic rod is provided with a pin hole, and the telescopic rod is sleeved on the power pin through the pin hole. A straight connecting rod 43 is provided on each side of the cylindrical main body 21. One end of the straight connecting rod 43 is hinged to the second hinge node 412 of the power lever 41, and the other end is hinged to the third hinge fulcrum of the movable seat. When the hydraulic telescopic device 30 extends or retracts, the power lever 41 rotates around the first hinge node 411, which drives the straight connecting rod 43 to move back and forth, and the straight connecting rod drives the movable seat to move synchronously.

[0052] Combination Figures 1 to 4 As shown, the one-way moving device 60 includes multiple first limit valves 61 and multiple second limit valves 62. Both the first limit valves 61 and the second limit valves 62 provide one-way limit to the steel rod 10, preventing it from moving backward while allowing it to move forward. For example, the first limit valve 61 is mounted on the movable seat 50, and the second limit valve 62 is mounted on the cylindrical body 21. The first limit valves 61 and 62 are structurally identical, each including a pin, a limit plate, and a torsion spring. The limit plate is fan-shaped and is hinged to the movable seat or the cylindrical body 21 via the pin, allowing it to rotate around the pin. The torsion spring is mounted on the pin and applies a force to the limit plate, causing the end of the limit plate to press against the steel rod 10 and abut against the annular wedge-shaped groove 12. The cylindrical body 21 is hollowed out, and the second limit valve 62 is located in the hollowed-out part of the cylindrical body 21. Setting the second limit valve 62 to have the same structure as the first limit valve 61 can reduce the number of standard parts. For example, three of each of the first limit valve 61 and the second limit valve 62 are provided and arranged around the steel rod.

[0053] The hydraulic pile cutting device unit 1 provided in this embodiment sets the hydraulic telescopic device 30 and the steel rod 10 as upper and lower layers, which can reduce the length of the hydraulic pile cutting device unit 1. Moreover, the hydraulic telescopic device 30 moves the steel rod 10 forward by extending and retracting in multiple steps. Each time, the hydraulic telescopic device 30 only moves a very short distance, so a short-stroke hydraulic telescopic device 30 can be selected, further reducing the length of the hydraulic pile cutting device unit 1. In addition, the displacement of the hydraulic telescopic device 30 is transmitted to the movable seat through the force transmission device 40. The force of the hydraulic telescopic device 30 can be amplified by the power lever 41, so a low-power hydraulic telescopic device 30 can be selected. Therefore, the hydraulic pile cutting device unit provided in this embodiment has a smaller length, can adapt to construction sites with small pile spacing, and can reduce equipment costs by selecting a short-stroke, low-power hydraulic telescopic device 30.

[0054] Figure 8 A schematic diagram shows eight hydraulic pile-cutting device units 1 spliced ​​together to form a hydraulic pile-cutting device. Adjacent hydraulic pile-cutting device units 1 are spliced ​​and fixed by a splicing and fixing device 70, which can improve the splicing efficiency. The specific structure of the splicing and fixing device 70 can be set as needed. For example, connecting lugs can be set on both sides of the cylindrical main body 21, and the connecting lugs of adjacent hydraulic pile-cutting device units 1 can be spliced ​​and fixed by pins. Figure 8 The image shows a more adaptable splicing and fixing device 70, which includes two first hinge joint screws 71 and two second hinge joint screws 72. Each first hinge joint screw 71 includes a first threaded rod and a first connecting ring at one end. Each second hinge joint screw 72 includes a second threaded rod and a second connecting ring at one end. To cooperate with the first and second hinge joint screws 71 and 72, horizontal first threaded holes are provided on both sides of the rear end of the cylindrical body 21. For example, the first hinge fulcrum 23 is a horizontally arranged internally threaded round tube, which also serves as a threaded hole. Horizontal second threaded holes are provided on both sides of the front end of the cylindrical body 21. For example, the second hinge fulcrum 24 is a horizontally arranged internally threaded round tube, which also serves as a threaded hole. The first threaded rod is threadedly connected to the first threaded hole; the second threaded rod is threadedly connected to the second threaded hole. The first connecting ring of the adjacent hydraulic pile cutting device unit 1 is fixed by a pin, and the second connecting ring is fixed by a pin. The insertion lengths of the first and second threaded rods are adjustable, which facilitates the splicing and fixing of all hydraulic pile cutting device units 1 according to preset dimensions, thereby improving the installation accuracy of the equipment.

[0055] Example 2

[0056] This embodiment provides a method of using the hydraulic pile-cutting device unit as described in Embodiment 1. The following describes a method in conjunction with... Figures 1 to 9 The method of use is further described below. The method of use includes the following steps:

[0057] Step 1: In the initial state, the hydraulic telescopic device is in the retracted state, and the first limit valve 61 and the second limit valve 62 unidirectionally limit the tooth groove 12 of the steel rod 10.

[0058] Step 2: The hydraulic telescopic device 30 extends, the force transmission device 40 pulls the movable seat 50 forward, the first limit valve 61 pushes the steel rod 10 forward synchronously by M tooth grooves 12, and the second limit valve 62 does not obstruct the forward movement of the steel rod 10, where M is a preset value, M≥1;

[0059] Step 3: The hydraulic telescopic device 30 retracts, the force transmission device 40 pushes the movable seat 50 to move backward, the first limit valve moves backward simultaneously by M tooth grooves 12, and the second limit valve 62 unidirectionally limits the tooth grooves 12 of the steel rod 10, so that the position of the steel rod 10 remains unchanged.

[0060] Step 4: Repeat steps 2 and 3 to move the steel rod 10 forward step by step.

[0061] In one specific embodiment, the first limiting valve 61 and the second limiting valve 62 unidirectionally limit the tooth groove 12 of the steel rod 10 by means of a fan-shaped limiting plate being stuck in the tooth groove 12. The tooth groove 12 has a forward-facing slope and a rearward-facing vertical end face. The fan-shaped limiting plate abuts against the vertical end face to prevent the steel rod 10 from moving backward. When the steel rod 10 moves forward, the limiting plate slides along the slope to the next tooth groove 12, thus achieving unidirectional limiting of the steel rod 10.

[0062] In one specific embodiment, the specific structure of the force transmission device 40 is as described in Embodiment 1. When the hydraulic telescopic device 30 extends, the power lever 41 rotates counterclockwise along the second hinge node, driving the straight connecting rod 43 to move the movable seat forward, and the first limit valve 61 pushes the steel rod 10 forward. When the hydraulic telescopic device 30 retracts, the power lever 41 rotates clockwise along the second hinge node, driving the straight connecting rod 43 to move the movable seat backward, the first limit valve 61 moves backward, and the second limit valve 62 remains against the groove of the steel rod 10 to keep the steel rod stationary.

[0063] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0064] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A hydraulic pile-cutting device unit, characterized in that, It includes steel chisels, guide bases, movable seats, hydraulic telescopic devices, force transmission devices, and unidirectional movement devices; The steel rod is a cylinder with a pointed end, and several annular wedge-shaped grooves are provided on the cylinder. The guide base includes a cylindrical body with a guide hole arranged axially inside the cylindrical body. A steel rod is placed in the guide hole, with the tip of the steel rod located at the front end of the cylindrical body and the tail end of the steel rod extending out of the rear end of the cylindrical body. A hollow part is provided on the cylindrical body. The movable seat is located at the tail of the guide base, with a through hole in the middle and fitted onto the tail of the steel rod; The one-way moving device includes several first limit valves and second limit valves. The first limit valves are set on the movable base, and the second limit valves are set in the hollow part of the cylindrical body. Both the first limit valves and the second limit valves are connected to the groove of the steel rod with a snap-fit, which can prevent the steel rod from moving backward. The hydraulic telescopic device is installed on the cylindrical body. The force transmission device can transmit the displacement of the telescopic end of the hydraulic telescopic device to the movable seat. The telescopic extension of the hydraulic telescopic device can drive the movable seat to move back and forth. When the movable seat moves forward, the first limit valve locks the steel rod groove and pushes the steel rod forward. When the movable seat moves backward, the second limit valve locks the steel rod groove and keeps the steel rod stationary. The top of the rear end of the cylindrical body is provided with a first hinge fulcrum, and the bottom of the front end of the cylindrical body is provided with a second hinge fulcrum. The force transmission device includes two power levers, one power pin, and two straight connecting rods; one power lever is set on each side of the cylindrical body, the bottom of the power lever is hinged to the second hinge fulcrum, and the top of the two power levers are respectively hinged to the end 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 movable 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. The hydraulic telescopic device and the steel rod are arranged in two layers, upper and lower.

2. The hydraulic pile cutting device unit as described in claim 1, characterized in that, Both the first and second limit valves include a pin, a limit plate, and a torsion spring. One end of the limit plate is sleeved on the pin, and the torsion spring is set on the pin. The pin of the first limit valve is set on the movable seat, and the pin of the second limit valve is set on the cylindrical body. The torsion spring causes the end of the limit plate to press against the steel rod and abut against the annular wedge-shaped groove.

3. The hydraulic pile cutting device unit as described in 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 first threaded hole is provided with a first hinged joint screw, and the second threaded hole is provided with a second hinged joint screw; The first hinged joint screw includes a first threaded rod and a first connecting ring disposed at one end of the first threaded rod; the first threaded rod is threadedly connected to a first threaded hole. The second hinge joint screw includes a second threaded rod and a second connecting lug plate disposed at one end of the second threaded rod; the second threaded rod is threadedly connected to the second threaded hole.

4. The method of using the hydraulic pile-cutting device unit as described in any one of claims 1 to 3, characterized in that, Includes the following steps: Step 1: In the initial state, the hydraulic telescopic device is in the retracted state, and the first limit valve and the second limit valve limit the steel chisel groove in one direction. Step 2: Extend the hydraulic telescopic device. The force transmission device pulls the movable seat forward. The steel rod moves forward synchronously with the first limit valve by M tooth spacings. The second limit valve does not obstruct the forward movement of the steel rod. M is a preset value, M≥1. Step 3: The hydraulic telescopic device retracts, the force transmission device pulls the movable seat backward, the first limit valve moves backward simultaneously by M tooth spacing, and the second limit valve unidirectionally limits the tooth spacing of the steel rod, so that the position of the steel rod remains unchanged. Step 4: Repeat steps 2 and 3 to move the steel rod forward gradually.

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