Hydrostatic automatic pile driver

Abstract

The hydraulic static automatic pile presser is characterized in that: the hydraulic static automatic pile presser comprises a counterforce frame, a hydraulic jack and a pile holding mechanism, the pile holding mechanism comprises a pile holding cone sleeve, the inner hole of the pile holding cone sleeve is a taper hole, the hydraulic jack drives the pile holding cone sleeve to ascend and descend, and the lower end of the pile holding cone sleeve is connected with a bottom cover; a plurality of holding cone cores are arranged in the taper hole; the hydraulic elements corresponding to the holding cone cores one by one comprise: a vertical piston cavity arranged in the corresponding holding cone core; a locking piston arranged in the vertical piston cavity and separating the vertical piston cavity into two cavities in upper and lower directions, the lower end of the locking piston is connected with a piston rod, and the lower end of the piston rod is connected with the bottom cover and can move along the taper hole in a radial direction.

Description

Technical Field

[0001] The present invention relates to the technical field of pile drivers, in particular to a hydraulic static automatic pile driver. Background Art

[0002] Anchor static pressure piles are a highly effective foundation reinforcement and treatment technology, particularly suitable for strengthening and rectifying the foundations of existing buildings. This technology uses pre-buried anchor rods in the building foundation and a hydraulic system to gradually press prefabricated pile segments into the soil, thereby enhancing the foundation's bearing capacity and stability. Anchor static pressure piles are constructed with low noise and vibration, and have minimal impact on the surrounding environment and buildings. They offer advantages such as flexible construction and strong adaptability. They can effectively address problems such as foundation settlement and uneven subsidence, improving the safety and durability of buildings. In recent years, anchor static pressure piles have been widely used in areas such as urban renewal and the preservation of ancient buildings, becoming a key technology in foundation treatment.

[0003] The commonly used anchor static pile driver currently consists of a pile driving frame, a pile holding mechanism, a hydraulic jack, and a reaction anchor. The reaction anchor installs the pile driving frame at a designated location on the foundation. The pile holding mechanism is used to hold the pile tightly. Specifically, the pile holding mechanism consists of several pile holding cylinders and several holding blocks. The pile holding cylinders drive the corresponding holding blocks to move laterally to hold the pile tightly. The hydraulic jack drives the pile holding mechanism up and down to press the pile into the foundation. The pile holding mechanism of the current pile driver has the following shortcomings:

[0004] First, the holding force of the pile holding mechanism is determined by the pressing force applied by the pile holding cylinder. The holding force is fixed and unchanged. During the pile driving process, the pile may slip due to insufficient holding force, especially in large-tonnage pile driving operations, which are more prone to pile slippage.

[0005] Secondly, the piston rod of the pile holding cylinder of the pile holding mechanism extends and contracts laterally, driving the clamping block to move laterally to clamp the pile body. During the pile pressing process, the clamping block and the pile holding cylinder are subjected to upward torsion, and the piston rod of the pile holding cylinder is prone to twisting and deformation, resulting in poor structural stability.

[0006] For example, Chinese patent publication number CN222044189U describes a static pile driver for foundation reinforcement anchor bolts. The driver comprises a cylinder frame, with a pile clamping mechanism connected to the bottom end, and a base at the bottom end. The pile clamping mechanism consists of a clamping head cover plate and a built-in pile-holding cylinder. The cylinder drives a piston rod to extend and retract laterally to secure the pile, but this mechanism also suffers from the aforementioned shortcomings. Summary of the Invention

[0007] The purpose of the present invention is to provide a hydraulic static automatic pile driver which not only has good structural stability and can effectively solve the problem that the piston rod of the pile holding cylinder in the prior art is prone to twisting and deformation; but also can effectively solve the problem that the pile is prone to slipping due to insufficient clamping force during the pile driving process.

[0008] The technical solution of the present invention is:

[0009] A hydraulic static automatic pile driver includes a reaction frame, a hydraulic jack and a pile holding mechanism, wherein the pile holding mechanism includes:

[0010] The pile holding cone sleeve has an inner hole with an inner diameter that gradually increases from top to bottom. A hydraulic jack is installed on the reaction frame to drive the pile holding cone sleeve to rise and fall. The lower end of the pile holding cone sleeve is connected to a bottom cover.

[0011] A plurality of holding cone cores are arranged in the tapered hole and evenly distributed around the circumference of the tapered hole, and a side surface of the holding cone core facing the inner wall of the tapered hole is a conical surface that matches the inner wall of the tapered hole;

[0012] The hydraulic components corresponding to the clamping cone core include:

[0013] A vertical piston chamber is provided in the corresponding clamping cone core;

[0014] The locking piston is set in the vertical piston cavity and divides the vertical piston cavity into two cavities, the lower end of the locking piston is connected to the piston rod, and the lower end of the piston rod can move along the radial direction of the tapered hole and is connected to the bottom cover. The specific working of a hydraulic static automatic pile driver of this scheme is as follows:

[0015] First, after the hydraulic static automatic pile driver is in place, the pile body is inserted into the pile holding cone sleeve from top to bottom, and the hydraulic jack drives the pile holding cone sleeve to the highest position.

[0016] Second, hydraulic oil is injected into the upper cavity to move the clamping cone core upward. During this process, each clamping cone core will shrink toward the center of the tapered hole under the action of the tapered surface of the tapered hole of the pile-holding cone sleeve, and drive the piston rod to move along the radial direction of the tapered hole, thereby clamping the pile body through each clamping cone core.

[0017] Third, the hydraulic jack presses the pile holding cone sleeve downward until it drops to the lowest position. During this process, the pile holding mechanism will drive the tightly held pile body into the foundation.

[0018] Fourth, hydraulic oil is injected into the lower cavity to move the holding cone core downward, so that each holding cone core loosens the pile body; then, the hydraulic jack drives the pile holding cone sleeve to rise to the highest position, completing a pile pressing process.

[0019] Fifth, return to the second step until the pile pressing is completed.

[0020] Since the pile holding mechanism adopts the tapered hole of the pile holding cone sleeve, the clamping cone core contracts toward the center of the tapered hole during the upward movement, and can drive the piston rod to move radially along the tapered hole, thereby clamping the pile body through each clamping cone core; in this way, during the pile driving process, the piston rod and the locking piston will not be subjected to torsion and will not be deformed, its structural stability is good, and the problem that the piston rod of the pile holding cylinder in the prior art is prone to twisting and deformation is effectively solved; and the clamping force of each clamping cone core clamping the pile body will increase with the increase of the pile driving force, and the pile driving force is converted into a clamping force, thereby effectively solving the problem that the pile is easily slipped due to insufficient clamping force during the pile driving process, and is particularly suitable for large-tonnage pile driving operations; in addition, in the second step, after the pile holding mechanism clamps the pile body each time, the pile body can be automatically centered to ensure the verticality of the pile body each time the pile body is pressed into the foundation (i.e., the third step), so that the pile body can be smoothly pressed into the foundation according to the set orientation.

[0021] In addition, this solution embeds the hydraulic component between the pile holding cone sleeve and the bottom cover, and embeds the vertical piston chamber of the hydraulic component that drives the holding cone core to rise and fall inside the holding cone core. This not only effectively improves the structural compactness of the pile holding mechanism and reduces the space occupied by the pile holding mechanism; but also the built-in hydraulic component will not be bumped in the working state, which can effectively protect the hydraulic component.

[0022] Preferably, a locking tooth block is connected to the side of the gripping cone facing the center of the tapered hole. The locking tooth block is also provided with a plurality of protruding teeth arranged sequentially from bottom to top on the side facing the center of the tapered hole. This allows the gripping mechanism to grip the pile in the second step, and the protruding teeth of the locking tooth block will cut into the pile, thereby effectively increasing the gripping force of the gripping mechanism and further preventing the pile from slipping due to insufficient gripping force.

[0023] Preferably, a limiting groove is provided on the clamping cone core, and the locking tooth block is provided with a limiting block, which is locked in the limiting groove. In this way, on the one hand, the locking tooth block can be positioned, and on the other hand, the stability of the connection structure between the locking tooth block and the clamping cone core can be improved.

[0024] Preferably, the locking tooth block is bolted to the clamping cone. This facilitates installation and replacement of the locking tooth block. The locking tooth block can be removed and replaced individually, allowing for replacement of different locking tooth blocks according to the thickness of the pile on site. This eliminates the need to disassemble the entire pile clamping mechanism when replacing the locking tooth block, making it convenient, quick, and time-saving.

[0025] Preferably, a locking device is further included, comprising:

[0026] The vertical cylinder body is provided with through holes at the upper and lower ends and is fixed to the top of the reaction frame. The vertical cylinder body is provided with two upper and lower interfaces;

[0027] The upper, middle and lower pistons are integrated and slidably arranged in the vertical cylinder body, the lower piston is provided with a vertical ejector rod at the lower end, and the vertical ejector rod passes through the through hole at the lower end of the vertical cylinder body;

[0028] The lower piston is pressed against the bottom end of the vertical cylinder body under the action of the spring, at this time, the upper interface is located between the upper and middle pistons, and the lower interface is located between the middle and lower pistons;

[0029] The connecting rope passes through the through hole at the upper end of the vertical cylinder body and connects the upper piston and the pile clamping cone sleeve;

[0030] The hydraulic element further comprises a front oil pipe and a rear oil pipe, the front oil pipe is connected with the lower interface and each upper cavity, and one end of the rear oil pipe is connected with the upper interface;

[0031] When the pile clamping cone sleeve rises to the highest position, the vertical ejector rod is pressed against the pile clamping cone sleeve, and the upper and lower interfaces are both located between the middle and lower pistons;

[0032] When the pile clamping cone sleeve descends to the lowest position, the connecting rope is in a taut state, and the upper and lower interfaces are both located between the middle and lower pistons.

[0033] In the actual pile pressing process, the pile clamping mechanism should be in a clamping state during the process that the hydraulic jack presses the pile clamping cone sleeve downward to press the pile into the foundation, but in the actual operation process, the operator may accidentally touch or operate, control the hydraulic oil to be injected into the lower cavity, and make the clamping cone core move downward to loosen the pile, resulting in failure of pile pressing. Similarly, in the process that the hydraulic jack drives the pile clamping cone sleeve to rise to the highest position, the pile clamping mechanism should be in a loosening state, but in the actual operation process, the operator may accidentally touch or operate, control the hydraulic oil to be injected into the upper cavity, and make the clamping cone core move upward to clamp the pile, so that the pile pressed into the foundation is pulled out. In order to solve the above problems, the locking device is specially provided,

[0034] The hydraulic element injects hydraulic oil into the upper cavity through the front oil pipe and the rear oil pipe;

[0035] When the pile clamping cone sleeve rises to the highest position, the vertical ejector rod is pressed against the pile clamping cone sleeve, and the upper and lower interfaces are both located between the middle and lower pistons, at this time, hydraulic oil can be injected into the upper cavity through the front oil pipe and the rear oil pipe, so that each clamping cone core moves upward to clamp the pile, without affecting the normal clamping operation of the pile clamping mechanism.

[0036] In the process of the hydraulic jack pressing down the pile-holding cone sleeve, the lower piston moves down under the action of the spring until it abuts against the bottom end of the vertical cylinder. When the lower piston abuts against the bottom end of the vertical cylinder, the upper interface is located between the upper and middle pistons, and the lower interface is located between the middle and lower pistons. Thereafter, in the process of the hydraulic jack continuing to press down the pile-holding cone sleeve, the oil pressure in the upper cavity is maintained because the upper interface is cut off from the lower interface. Even if the operator makes a mistake or misoperation and controls the hydraulic oil to be injected into the lower cavity, the hydraulic oil cannot be injected into the lower cavity, so that the pile-holding mechanism is kept in the holding state, and the problem of the pile-holding cone core moving down to loosen the pile and causing the pile pressing to fail is avoided.

[0037] When the pile-holding cone sleeve is lowered to the lowest position, the connecting rope is in a taut state, and the upper and lower interfaces are both located between the middle and lower pistons. At this time, the hydraulic oil in the upper cavity can flow out through the front oil pipe and the rear oil pipe, so that the hydraulic oil can be controlled to be injected into the lower cavity, the pile-holding cone core is moved down to loosen the pile, and the normal holding operation of the pile-holding mechanism is not affected.

[0038] Similarly, in the process of the hydraulic jack driving the pile-holding cone sleeve to rise from the lowest position to the highest position, when the lower piston moves down under the action of the spring until it abuts against the bottom end of the vertical cylinder. When the lower piston abuts against the bottom end of the vertical cylinder, the upper interface is located between the upper and middle pistons, and the lower interface is located between the middle and lower pistons. Thereafter, in the process of the hydraulic jack continuing to drive the pile-holding cone sleeve to rise, the hydraulic oil cannot be injected into the upper cavity even if the operator makes a mistake or misoperation and controls the hydraulic oil to be injected into the upper cavity, so that the pile-holding mechanism is kept in the loosening state, and the problem of the hydraulic oil being injected into the upper cavity, the pile-holding cone core moving up to hold the pile, and the pile pressed into the foundation being pulled out is avoided.

[0039] As a preferred embodiment, the top of the vertical cylinder is provided with a guide wheel or a guide ring, and the connecting rope passes around the guide wheel or through the guide ring.

[0040] As a preferred embodiment, the bottom cover is provided with a long hole corresponding to the piston rod, the long hole extends along the radial direction of the cone hole, the lower end of the piston rod passes through the corresponding long hole, the lower part of the piston rod is provided with a stepped surface and a limiting piece, the bottom cover is located between the stepped surface and the limiting piece, and the stepped surface and the limiting piece are close to the bottom cover. In this way, the piston rod can slide along the corresponding long hole, so that the lower end of the piston rod can be connected to the bottom cover while moving radially along the cone hole.

[0041] As a preferred embodiment, the counterforce frame includes a top frame, a counterforce base, and a stand connecting the top frame and the counterforce base, the middle part of the counterforce base is provided with a base through hole, the pile-holding cone sleeve rises and falls along the stand, and the pile-holding cone sleeve is located between the top frame and the counterforce base.

[0042] As a preferred embodiment, the hydraulic jack is arranged on the top frame, and the top frame is further provided with a lifting ring.

[0043] Preferably, the bottom cover is connected to the lower end of the pile-holding cone sleeve by bolts, and a bottom cover opening is provided in the middle of the bottom cover, so as to facilitate the installation and removal of the bottom cover and the installation and removal of the pile-holding mechanism.

[0044] The beneficial effects of the present invention are as follows: since the pile holding mechanism adopts the tapered hole of the pile holding cone sleeve, the clamping cone core shrinks toward the center of the tapered hole during the upward movement, and can drive the piston rod to move radially along the tapered hole, thereby clamping the pile body through each clamping cone core; in this way, during the pile driving process, the piston rod and the locking piston will not be subjected to torsion and will not be deformed, and its structural stability is good, which can effectively solve the problem that the piston rod of the pile holding cylinder in the prior art is prone to twisting and deformation; and the clamping force of each clamping cone core clamping the pile body will increase with the increase of the pile driving force, and the pile driving force is converted into a clamping force, thereby effectively solving the problem of pile slippage caused by insufficient clamping force during the pile driving process, and is particularly suitable for realizing large-tonnage pile driving operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a structural schematic diagram of a hydraulic static automatic pile driver according to the first and second specific embodiments of the present invention.

[0046] Figure 2 yes Figure 1 side view.

[0047] Figure 3 It is a partial structural diagram of the pile-holding mechanism of the first and second specific embodiments of the present invention.

[0048] Figure 4 This is a structural diagram of a hydraulic static automatic pile driving in a certain state during operation according to the third specific embodiment of the present invention.

[0049] Figure 5 This is a structural schematic diagram of another state of a hydraulic static automatic pile driving in the working process of the specific embodiment 3 of the present invention.

[0050] In the picture:

[0051] Reaction frame 1, top frame 1.1, reaction base 1.2, column 1.3;

[0052] Hydraulic jack 2;

[0053] Pile holding mechanism 3, pile holding cone sleeve 3.1, holding cone core 3.2, bottom cover 3.3, vertical piston chamber 3.4, locking piston 3.5, cylinder cover 3.6, piston rod 3.7, elongated hole 3.8, stopper 3.9, locking tooth block 3.10, convex tooth 3.11;

[0054] Locking device 4, vertical cylinder 4.1, upper interface 4.2, lower interface 4.3, upper piston 4.5, middle piston 4.6, lower piston 4.7, vertical push rod 4.8, connecting rope 4.9, guide wheel 4.10. DETAILED DESCRIPTION

[0055] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0056] Specific embodiment 1, as Figure 1 、 Figure 2 、 Figure 3 As shown, a hydraulic static automatic pile driver includes a reaction frame 1, a hydraulic jack 2 and a pile holding mechanism 3.

[0057] The pile-holding mechanism 3 comprises a pile-holding cone sleeve 3.1, several gripping cones 3.2, and hydraulic components corresponding to the gripping cones 3.2. The inner bore of the pile-holding cone sleeve 3.1 is a tapered hole with a gradually increasing inner diameter from top to bottom. The lower end of the pile-holding cone sleeve 3.1 is connected to a bottom cover 3.3. A hydraulic jack 2, mounted on the reaction frame 1, drives the pile-holding cone sleeve 3.1 up and down. Each gripping cone 3.2 is positioned within the tapered hole.

[0058] The holding cone cores 3.2 are evenly distributed around the circumference of the tapered hole. The side surface of the holding cone core 3.2 facing the inner wall of the tapered hole is a conical surface that matches the inner wall of the tapered hole.

[0059] The hydraulic element consists of a vertical piston chamber 3.4 and a locking piston 3.5. The vertical piston chamber 3.4 is located within the corresponding clamping cone 3.2. The locking piston 3.5 slides within the vertical piston chamber 3.4. The locking piston 3.5 divides the vertical piston chamber into two chambers (an upper chamber and a lower chamber). The lower end of the locking piston 3.5 is connected to a piston rod 3.7. The lower end of the piston rod 3.7 is connected to the bottom cover 3.3, allowing it to move radially along the tapered hole. The piston rods are arranged vertically in layers, and their vertical height remains constant.

[0060] The specific operation of a hydraulic static automatic pile driver of this embodiment is as follows:

[0061] First, after the hydraulic static automatic pile driver is in place, the pile body is inserted into the pile holding cone sleeve 3.1 from top to bottom, and the hydraulic jack 2 drives the pile holding cone sleeve 3.1 to rise to the highest position.

[0062] Second, hydraulic oil is injected into the upper cavity to move the clamping cone core 3.2 upward. During this process, under the action of the conical surface of the conical hole of the pile-holding cone sleeve 3.1, each clamping cone core 3.2 will shrink toward the center of the conical hole and drive the piston rod 3.7 to move along the radial direction of the conical hole, thereby clamping the pile body through each clamping cone core 3.2.

[0063] Third, the hydraulic jack 2 presses the pile-holding cone sleeve 3.1 downward until the pile-holding cone sleeve 3.1 drops to the lowest position. During this process, the pile-holding mechanism 3 drives the pile body to be held tightly and pressed into the foundation.

[0064] Fourth, hydraulic oil is injected into the lower cavity to move the holding cone core 3.2 downward, so that each holding cone core 3.2 loosens the pile body; then, the hydraulic jack 2 drives the pile holding cone sleeve 3.1 to rise to the highest position, completing a pile pressing process.

[0065] Fifth, return to the second step until the pile pressing is completed.

[0066] Since the pile holding mechanism 3 adopts the tapered hole of the pile holding cone sleeve 3.1, the holding cone core 3.2 shrinks toward the center of the tapered hole during the upward movement, and can drive the piston rod 3.7 to move along the radial direction of the tapered hole, thereby holding the pile body through each holding cone core 3.2; in this way, during the pile pressing process, the piston rod 3.7 and the locking piston 3.5 will not be subjected to torsion and will not be deformed, and its structural stability is good, which can effectively solve the problem that the piston rod 3.7 of the pile holding cylinder in the prior art is prone to twisting and deformation; and each holding cone core 3.2 .2 The holding force of the pile body will increase with the increase of the pile driving force, and the pile driving force will be converted into a holding force, thereby effectively solving the problem of pile slippage caused by insufficient holding force during the pile driving process, which is particularly suitable for large-tonnage pile driving operations; in addition, in the second step, the pile holding mechanism 3 can automatically center the pile body each time it holds the pile body, so as to ensure the verticality of the pile body each time the pile body is pressed into the foundation (that is, the verticality of the pile body in the third step), so that the pile body can be smoothly pressed into the foundation according to the set direction.

[0067] In addition, in this embodiment, the hydraulic element is built into the pile holding cone sleeve 3.1 and the bottom cover 3.3, and the vertical piston chamber 3.4 of the hydraulic element that drives the clamping cone core 3.2 to rise and fall is built into the clamping cone core 3.2. In this way, not only can the structural compactness of the pile holding mechanism 3 be effectively improved and the space occupied by the pile holding mechanism 3 be reduced; but also the built-in hydraulic element will not be bumped in the working state, which can effectively protect the hydraulic element.

[0068] Specific embodiment 2, as Figure 1 、 Figure 2 、 Figure 3 As shown, a hydraulic static automatic pile driver includes a reaction frame 1, a hydraulic jack 2 and a pile holding mechanism 3.

[0069] The pile-holding mechanism 3 comprises a pile-holding cone 3.1, several gripping cones 3.2, and hydraulic components corresponding to the gripping cones 3.2. The inner bore of the pile-holding cone 3.1 is a tapered hole with a gradually increasing inner diameter from top to bottom. In this embodiment, the axis of the tapered hole is vertically oriented. The lower end of the pile-holding cone 3.1 is connected to a bottom cover 3.3. A bottom cover opening is provided in the middle of the bottom cover 3.3.

[0070] The hydraulic jack 2 is arranged on the reaction frame 1 to drive the pile holding cone sleeve 3.1 to rise and fall. There are one or more hydraulic jacks 2. In this embodiment, there are two hydraulic jacks 2, and the axes of the cone holes of the two hydraulic jacks 2 are distributed in this direction.

[0071] Each of the clamping cone cores 3.2 is disposed within the tapered hole. Each of the clamping cone cores 3.2 is evenly distributed around the circumference of the tapered hole. The side of the clamping cone core 3.2 facing the inner wall of the tapered hole is a conical surface that mates with the inner wall of the tapered hole. The conical surface of the clamping cone core 3.2 is close to or in close contact with the inner wall of the tapered hole.

[0072] The hydraulic element includes a vertical piston chamber 3.4 and a locking piston 3.5. The vertical piston chamber 3.4 is disposed within the corresponding clamping cone 3.2. In this embodiment, the lower end of the vertical piston chamber 3.4 is open, and a cylinder head 3.6 is sealedly connected to the lower opening of the vertical piston chamber 3.4. The locking piston 3.5 is slidably disposed within the vertical piston chamber 3.4. The lower end of the locking piston 3.5 is connected to a piston rod 3.7, which passes through the cylinder head 3.6. The piston rod layers are vertically distributed, and the vertical height of the piston rod 3.7 remains unchanged.

[0073] The lower end of the piston rod 3.7 is connected to the bottom cover 3.3 so as to be movable along the radial direction of the tapered hole.

[0074] In one example, the bottom cover 3.3 is provided with an elongated hole 3.8 corresponding to the piston rod 3.7 one by one. The elongated hole 3.8 extends radially along the tapered hole. The lower end of the piston rod 3.7 passes through the corresponding elongated hole 3.8. A step surface and a limit member 3.9 are provided at the lower part of the piston rod 3.7. The bottom cover 3.3 is located between the step surface and the limit member 3.9, and the step surface and the limit member 3.9 are close to the bottom cover 3.3. In this embodiment, the limit member 3.9 is composed of a limit nut, which is threadedly connected to the lower end of the piston rod 3.7, and there is a gap between the limit nut and the bottom cover 3.3. In this way, the piston rod 3.7 can slide along the corresponding elongated hole 3.8, so that the lower end of the piston rod 3.7 can be connected to the bottom cover 3.3 by moving radially along the tapered hole.

[0075] In another embodiment, the bottom cover 3.3 is provided with guide rails corresponding to the piston rods 3.7. The guide rails extend radially along the tapered hole. Sliders are provided on the guide rails, and the lower end of the piston rod 3.7 is fixedly connected to the slides (not shown). This allows the piston rods 3.7 to slide along the corresponding guide rails, so that the lower end of the piston rods 3.7 can be connected to the bottom cover 3.3 in a radially movable manner along the tapered hole.

[0076] The specific operation of a hydraulic static automatic pile driver of this embodiment is as follows:

[0077] First, after the hydraulic static automatic pile driver is in place, the pile body is inserted into the pile holding cone sleeve 3.1 from top to bottom, and the hydraulic jack 2 drives the pile holding cone sleeve 3.1 to rise to the highest position.

[0078] Second, hydraulic oil is injected into the upper cavity to move the clamping cone core 3.2 upward. During this process, under the action of the conical surface of the conical hole of the pile-holding cone sleeve 3.1, each clamping cone core 3.2 will shrink toward the center of the conical hole and drive the piston rod 3.7 to move along the radial direction of the conical hole, thereby clamping the pile body through each clamping cone core 3.2.

[0079] Third, the hydraulic jack 2 presses the pile-holding cone sleeve 3.1 downward until the pile-holding cone sleeve 3.1 drops to the lowest position. During this process, the pile-holding mechanism 3 drives the pile body to be held tightly and pressed into the foundation.

[0080] Fourth, hydraulic oil is injected into the lower cavity to move the holding cone core 3.2 downward, so that each holding cone core 3.2 loosens the pile body; then, the hydraulic jack 2 drives the pile holding cone sleeve 3.1 to rise to the highest position, completing a pile pressing process.

[0081] Fifth, return to the second step until the pile pressing is completed.

[0082] Since the pile holding mechanism 3 adopts the tapered hole of the pile holding cone sleeve 3.1, the holding cone core 3.2 shrinks toward the center of the tapered hole during the upward movement, and can drive the piston rod 3.7 to move along the radial direction of the tapered hole, thereby holding the pile body through each holding cone core 3.2; in this way, during the pile pressing process, the piston rod 3.7 and the locking piston 3.5 will not be subjected to torsion and will not be deformed, and its structural stability is good, which can effectively solve the problem that the piston rod 3.7 of the pile holding cylinder in the prior art is prone to twisting and deformation; and each holding cone core 3.2 .2 The holding force of the pile body will increase with the increase of the pile driving force, and the pile driving force will be converted into a holding force, thereby effectively solving the problem of pile slippage caused by insufficient holding force during the pile driving process, which is particularly suitable for large-tonnage pile driving operations; in addition, in the second step, the pile holding mechanism 3 can automatically center the pile body each time it holds the pile body, so as to ensure the verticality of the pile body each time the pile body is pressed into the foundation (that is, the verticality of the pile body in the third step), so that the pile body can be smoothly pressed into the foundation according to the set direction.

[0083] In addition, in this embodiment, the hydraulic element is built into the pile holding cone sleeve 3.1 and the bottom cover 3.3, and the vertical piston chamber 3.4 of the hydraulic element that drives the clamping cone core 3.2 to rise and fall is built into the clamping cone core 3.2. In this way, not only can the structural compactness of the pile holding mechanism 3 be effectively improved and the space occupied by the pile holding mechanism 3 be reduced; but also the built-in hydraulic element will not be bumped in the working state, which can effectively protect the hydraulic element.

[0084] Specifically, such as Figure 1 、 Figure 2As shown, the reaction frame 1 includes a top frame 1.1, a reaction base 1.2 and columns 1.3 connecting the top frame 1.1 and the reaction base 1.2. There are 2-4 columns 1.3, and in this embodiment, there are 4 columns 1.3. The columns 1.3 are distributed vertically. A base opening is provided in the middle of the reaction base 1.2. The pile holding cone sleeve 3.1 rises and falls along the column 1.3, and the pile holding cone sleeve 3.1 is located between the top frame 1.1 and the reaction base 1.2. An annular baffle extending toward the center of the cone hole is provided on the top edge of the cone hole of the pile holding cone sleeve 3.1. The clamping cone core 3.2 is located below the annular baffle.

[0085] The hydraulic jack 2 is arranged on the top frame 1.1. In this embodiment, the hydraulic jack 2 is mounted on the top frame 1.1 by bolts, and the hydraulic cylinder of the hydraulic jack 2 is located above the top frame 1.1.

[0086] The top frame 1.1 is also provided with a number of lifting rings for lifting a hydraulic static automatic pile driver.

[0087] Furthermore, the bottom cover 3.3 is bolted to the lower end of the pile-holding cone 3.1. This facilitates installation and removal of the bottom cover 3.3, and thus of the pile-holding mechanism 3. Of course, it should be noted that the bottom cover 3.3 can also be connected to the lower end of the pile-holding cone 3.1 by welding or anchor bolts.

[0088] Further, such as Figure 3 As shown, a locking tooth block 3.10 is connected to the side of the gripping cone 3.2 that faces the center of the tapered hole. The locking tooth block 3.10 is also provided with a plurality of protruding teeth 3.11 arranged sequentially from bottom to top on the side that faces the center of the tapered hole. This allows the protruding teeth 3.11 of the locking tooth block 3.10 to cut into the pile body after the pile gripping mechanism 3 grips the pile body, effectively increasing the gripping force of the pile gripping mechanism 3 and further preventing the pile from slipping due to insufficient gripping force.

[0089] In this embodiment, the side of the locking tooth block 3.10 facing the center of the tapered hole is an arc surface. The arc surface is adapted to the pile body. The convex teeth 3.11 are arranged on the arc surface.

[0090] Furthermore, a limiting groove is provided on the clamping cone core 3.2, and a limiting block is provided on the locking tooth block 3.10, which is locked in the limiting groove. This not only allows the locking tooth block 3.10 to be positioned, but also improves the structural stability of the connection between the locking tooth block 3.10 and the clamping cone core 3.2.

[0091] Furthermore, the locking tooth block 3.10 is bolted to the clamping cone 3.2. This facilitates installation and replacement of the locking tooth block 3.10. The locking tooth block 3.10 can be removed and replaced individually, allowing different locking tooth blocks 3.10 to be replaced according to the thickness of the pile on site. This method eliminates the need to disassemble the entire pile clamping mechanism 3 when replacing the locking tooth block 3.10, making it convenient, quick, and time-saving.

[0092] Specific embodiment 3: The rest of the structure of this embodiment refers to specific embodiment 2, except that:

[0093] like Figure 4 As shown, a hydraulic static automatic pile driver further comprises a locking device 4. The locking device 4 comprises a vertical cylinder 4.1, a spring 4.4, a connecting rope 4.9 and three pistons connected as one.

[0094] The vertical cylinder 4.1 has through holes at its upper and lower ends. It is fixed to the top of the reaction frame 1. In this embodiment, the vertical cylinder 4.1 is fixed to the top frame 1.1 and is located above the top frame 1.1. The vertical cylinder 4.1 is provided with two upper and lower interfaces (i.e., an upper interface 4.2 and a lower interface 4.3).

[0095] The three pistons (upper, middle, and lower) are connected as one. Specifically, the upper piston 4.5, the middle piston 4.6, and the lower piston 4.7 are arranged sequentially from top to bottom, and any two adjacent pistons among the three are connected by a connecting rod. The upper piston 4.5, the middle piston 4.6, and the lower piston 4.7 are slidably disposed within the vertical cylinder 4.1. A vertical push rod 4.8 is provided at the lower end of the lower piston 4.7. The vertical push rod 4.8 passes through a through hole at the lower end of the vertical cylinder 4.1. The lower end of the vertical push rod 4.8 passes through the top frame 1.1 and is located below the top frame 1.1. The vertical push rod 4.8 is located above the upper end surface of the pile-holding cone sleeve 3.1.

[0096] The lower piston 4.7 is pressed against the bottom of the vertical cylinder 4.1 by the action of spring 4.4. Specifically, spring 4.4 is a compression spring 4.4, located within the vertical cylinder 4.1. The lower end of spring 4.4 presses against the upper piston 4.5, while the upper end of spring 4.4 presses against the upper end surface of the vertical cylinder 4.1. When the lower piston 4.7 presses against the bottom of the vertical cylinder 4.1 by the action of spring 4.4, the upper port 4.2 is located between the upper and middle pistons, and the lower port 4.3 is located between the middle and lower pistons.

[0097] The connecting rope 4.9 passes through the through hole at the upper end of the vertical cylinder body 4.1 and connects the upper piston 4.5 and the pile-holding cone sleeve 3.1. Specifically, one end of the connecting rope 4.9 is connected to the upper end of the upper piston 4.5; the other end of the connecting rope 4.9 first passes upward through the through hole at the upper end of the vertical cylinder body 4.1, and then extends downward along the vertical cylinder body 4.1 and is connected to the pile-holding cone sleeve 3.1.

[0098] The hydraulic element also includes a first oil pipe and a second oil pipe. The hydraulic element also includes a front oil pipe and a rear oil pipe. In this embodiment, the front oil pipe and the rear oil pipe constitute the first oil pipe. The second oil pipe corresponds one-to-one with the lower cavity, and the second oil pipe supplies oil to the corresponding lower cavity. The first oil pipe supplies oil to the upper cavity. Specifically, the front oil pipe connects the lower interface 4.3 with each upper cavity (in this embodiment, the front oil pipe includes a main pipe connected to the lower interface 4.3 and several branch pipes corresponding one-to-one to each, one end of each branch pipe is connected to the main pipe, and the other end of the branch pipe is connected to the corresponding upper cavity). One end of the rear oil pipe is connected to the upper interface 4.2.

[0099] In one example, the hydraulic component further includes a first oil circuit interface and a second oil circuit interface. The first oil circuit interface is connected to the upper cavity. Specifically, the first oil circuit interface is provided on the piston rod 3.7 and is connected to the upper end of the locking piston 3.5. The first oil circuit interface is located below the vertical piston cavity. The second oil circuit interface is connected to the lower cavity. Specifically, the second oil circuit interface is provided on the cylinder head 3.6, or the second oil circuit interface is provided on the piston rod 3.7 and is connected to the lower end of the locking piston 3.5. The main pipeline of the front oil pipe is connected to the lower interface 4.3, and the other end of the branch pipeline is connected to the corresponding first oil circuit interface. One end of the second oil pipe is connected to the corresponding second oil circuit interface.

[0100] like Figure 4 As shown, when the pile holding cone sleeve 3.1 rises to the highest position, the vertical push rod 4.8 abuts against the pile holding cone sleeve 3.1, the upper and lower interfaces are both located between the middle and lower pistons, and the connecting rope 4.9 is in a relaxed state.

[0101] like Figure 5 As shown, when the vertical push rod 4.8 is separated from the pile-holding cone sleeve 3.1, the lower piston 4.7 is pressed against the bottom end of the vertical cylinder 4.1 under the action of the spring 4.4. At this time, the upper interface 4.2 is located between the upper and middle pistons, and the lower interface 4.3 is located between the middle and lower pistons.

[0102] When the pile-holding cone sleeve 3.1 is lowered to the lowest position, the connecting rope 4.9 is in a taut state, and the upper and lower interfaces are both located between the middle and lower pistons.

[0103] During the actual pile driving process, when the hydraulic jack 2 pushes down the pile holding cone sleeve 3.1 and presses the pile body into the foundation, the pile holding mechanism 3 should be in a clamped state; but in the actual operation process, the operator may accidentally touch or misoperate and control the hydraulic oil to be injected into the lower cavity, causing the clamping cone core 3.2 to move downward and loosen the pile body, resulting in pile driving failure. Similarly, when the hydraulic jack 2 drives the pile holding cone sleeve 3.1 to rise to the highest position, the pile holding mechanism 3 should be in a loosened state; but in the actual operation process, the operator may accidentally touch or misoperate and control the hydraulic oil to be injected into the upper cavity, causing the clamping cone core 3.2 to move upward and clamp the pile body, causing the pile body pressed into the foundation to be pulled out. In order to solve the above problems, the present embodiment is specially provided with a locking device 4. Specifically,

[0104] The hydraulic components inject hydraulic oil into each upper cavity through the front oil pipe and the rear oil pipe.

[0105] When the pile-holding cone sleeve 3.1 rises to the highest position, the vertical push rod 4.8 rests on the pile-holding cone sleeve 3.1, and the upper and lower interfaces are both located between the middle and lower pistons. At this time, hydraulic oil can be injected into each upper cavity through the front oil pipe and the rear oil pipe to move each clamping cone core 3.2 upward to clamp the pile body without affecting the normal clamping operation of the pile-holding mechanism 3.

[0106] During the process of the hydraulic jack 2 pressing down on the pile-holding cone sleeve 3.1, the lower piston 4.7 moves downward under the action of the spring 4.4 until it contacts the bottom of the vertical cylinder 4.1. When the lower piston 4.7 contacts the bottom of the vertical cylinder 4.1, the upper interface 4.2 is located between the upper and middle pistons, and the lower interface 4.3 is located between the middle and lower pistons. Thereafter, during the process of the hydraulic jack 2 continuing to press down on the pile-holding cone sleeve 3.1, the oil pressure in the upper cavity is maintained within the cavity because the upper interface 4.2 and the lower interface 4.3 are cut off. During this process, even if the operator accidentally touches or misoperates the control to inject hydraulic oil into the lower cavity, the hydraulic oil cannot be injected into the lower cavity, thereby ensuring that the pile-holding mechanism 3 remains in a clamped state, preventing the clamping cone core 3.2 from moving downward and loosening the pile body, resulting in pile driving failure.

[0107] When the pile-holding cone sleeve 3.1 descends to the lowest position, the connecting rope 4.9 is in a taut state, and the upper and lower interfaces are both located between the middle and lower pistons; at this time, the hydraulic oil in the upper cavity can flow out through the front oil pipe and the rear oil pipe, so that the hydraulic oil can be controlled to be injected into the lower cavity, so that the holding cone core 3.2 moves downward to loosen the pile body, without affecting the normal holding operation of the pile-holding mechanism 3.

[0108] Similarly, after the pile-holding cone sleeve 3.1 descends to the lowest position, hydraulic oil is injected into the lower cavity to move the holding cone core 3.2 downward, so that each holding cone core 3.2 releases the pile body; in the process of the hydraulic jack 2 driving the pile-holding cone sleeve 3.1 to rise from the lowest position to the highest position, the lower piston 4.7 moves downward under the action of the spring 4.4 until it reaches the bottom end of the vertical cylinder body 4.1, the upper interface 4.2 is located between the upper and middle pistons, and the lower interface 4.3 is located between the middle and lower pistons. After that, when the hydraulic jack 2 continues to drive the pile-holding cone sleeve 3.1 to rise, since the upper interface 4.2 and the lower interface 4.3 are cut off, even if the operator accidentally touches or misoperates during this process, the hydraulic oil cannot be injected into the upper cavity when controlling the hydraulic oil to be injected into the upper cavity, thereby ensuring that the pile-holding mechanism 3 remains in a loose state, avoiding the hydraulic oil from being injected into the upper cavity, causing the clamping cone core 3.2 to move up and clamp the pile body, and causing the pile body pressed into the foundation to be pulled out.

[0109] Therefore, the locking device 4 of this embodiment can be used without affecting the normal clamping operation of the pile clamping mechanism 3.

[0110] Effectively solve the problem that "the hydraulic jack 2 pushes down the pile holding cone sleeve 3.1 to press the pile body into the foundation, and the operator accidentally touches or misoperates and controls the hydraulic oil to be injected into the lower cavity, causing the holding cone core 3.2 to move downward and loosen the pile body, resulting in pile pressing failure" and "the problem that the hydraulic jack 2 drives the pile holding cone sleeve 3.1 to rise to the highest position, and the operator accidentally touches or misoperates and controls the hydraulic oil to be injected into the upper cavity, causing the holding cone core 3.2 to move upward and hold the pile body, resulting in the pile body pressed into the foundation being pulled out."

[0111] Furthermore, a guide wheel 4.10 or a guide ring is provided on the top of the vertical cylinder 4.1, and the connecting rope 4.9 is passed around the guide wheel or through the guide ring. In this way, the connecting rope 4.9 can be guided by the guide wheel or the guide ring.

[0112] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent transformation made to the above embodiment based on the technical essence of the present invention still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A hydraulic static automatic pile driver, characterized in that: It includes reaction frame, hydraulic jack and pile holding mechanism. The pile holding mechanism includes: The pile holding cone sleeve has an inner hole with an inner diameter that gradually increases from top to bottom. A hydraulic jack is installed on the reaction frame to drive the pile holding cone sleeve to rise and fall. The lower end of the pile holding cone sleeve is connected to a bottom cover. A plurality of holding cone cores are arranged in the tapered hole and evenly distributed around the circumference of the tapered hole, and a side surface of the holding cone core facing the inner wall of the tapered hole is a conical surface that matches the inner wall of the tapered hole; The hydraulic components corresponding to the clamping cone core include: A vertical piston chamber is provided in the corresponding clamping cone core; The locking piston is arranged in the vertical piston cavity and divides the vertical piston cavity into two cavities, the lower end of the locking piston is connected to the piston rod, and the lower end of the piston rod is connected to the bottom cover so as to be movable along the radial direction of the tapered hole; Locking device, comprising: The vertical cylinder body is provided with through holes at the upper and lower ends and is fixed to the top of the reaction frame. The vertical cylinder body is provided with two upper and lower interfaces; The upper, middle and lower pistons are connected as one body and are slidably arranged in the vertical cylinder body. The lower end of the lower piston is provided with a vertical push rod, which passes through the through hole at the lower end of the vertical cylinder body. The spring, the lower piston is pressed against the bottom end of the vertical cylinder under the action of the spring. At this time, the upper interface is located between the upper and middle pistons, and the lower interface is located between the middle and lower pistons; The connecting rope passes through the through hole at the upper end of the vertical cylinder and connects the piston and the pile-holding cone sleeve; The hydraulic component also includes a front oil pipe and a rear oil pipe, the front oil pipe is connected to the lower interface and each upper cavity, and one end of the rear oil pipe is connected to the upper interface; When the pile holding cone sleeve rises to the highest position, the vertical push rod rests on the pile holding cone sleeve, and the upper and lower interfaces are both located between the middle and lower pistons; when the pile holding cone sleeve falls to the lowest position, the connecting rope is in a taut state, and the upper and lower interfaces are both located between the middle and lower pistons.

2. A hydraulic static automatic pile driver according to claim 1, characterized in that: A locking tooth block is connected to the side of the clamping cone core facing the center of the tapered hole, and a plurality of convex teeth are arranged in sequence from bottom to top on the side of the locking tooth block facing the center of the tapered hole.

3. A hydraulic static automatic pile driver according to claim 2, characterized in that: The clamping cone core is provided with a limiting groove, and the locking tooth block is provided with a limiting block, which is clamped in the limiting groove.

4. A hydraulic static automatic pile driver according to claim 2, characterized in that: The locking tooth block is locked on the clamping cone core by means of bolts.

5. A hydraulic static automatic pile driver according to claim 1, 2 or 3, characterized in that: A guide wheel or a guide ring is provided on the top of the vertical cylinder, and the connecting rope passes around the guide wheel or through the guide ring.

6. A hydraulic static automatic pile driver according to claim 1, 2 or 3, characterized in that: The bottom cover is provided with long holes corresponding to the piston rods one by one, and the long holes extend along the radial direction of the tapered hole. The lower end of the piston rod passes through the corresponding long holes. The lower part of the piston rod is provided with a step surface and a limit piece. The bottom cover is located between the step surface and the limit piece, and the step surface and the limit piece are close to the bottom cover.

7. A hydraulic static automatic pile driver according to claim 1, 2 or 3, characterized in that: The reaction frame includes a top frame, a reaction base and a column connecting the top frame and the reaction base. A base opening is provided in the middle of the reaction base. The pile holding cone sleeve rises and falls along the column. The pile holding cone sleeve is located between the top frame and the reaction base.

8. The hydraulic static automatic pile driver according to claim 7, characterized in that: The hydraulic jack is arranged on the top frame, and the top frame is also provided with a lifting ring.

9. A hydraulic static automatic pile driver according to claim 1, 2 or 3, characterized in that: The bottom cover is connected to the lower end of the pile-holding cone sleeve through bolts, and a bottom cover opening is provided in the middle of the bottom cover.

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