Mud cleaning and pile cutting equipment for waste pile foundation and construction method of mud cleaning and pile cutting equipment

Abstract

The invention discloses mud removing and pile cutting equipment for a waste pile foundation and a construction method of the mud removing and pile cutting equipment. The equipment is composed of a sleeve assembly, a hydraulic pile cutting shearing mechanism and a mud removing reamer assembly. The sleeve assembly comprises a cylindrical inner sleeve; the hydraulic pile cutting and shearing mechanism comprises hydraulic shearing equipment, the bottom of the hydraulic shearing equipment is rotationally connected with a dredging reamer assembly through a rotary support, the dredging reamer assembly comprises a hollow supporting barrel, a spiral reamer is arranged on the outer wall of the dredging reamer assembly, and a plurality of third overflowing holes are formed in the reamer face at intervals. A plurality of form relieved teeth are arranged on the end face of the tail end of the lower side of the spiral reamer, and a serrated knife with a plurality of form relieved teeth is arranged on the outer wall, opposite to the spiral reamer, of the supporting cylinder; according to the equipment and the construction method, the old pile foundation can be cut to the designed elevation position at a time, the cut-off pile and the equipment are integrally hoisted and transferred, the construction procedures are reduced, the equipment loss is reduced, meanwhile, the operation efficiency is improved, and the equipment and the construction method can be widely applied to reconstruction, extension and upgrading reconstruction of old wharfs and land waste structures.

Description

Technical Field

[0001] This invention relates to the field of renovation and expansion construction technology, and in particular to a mud-cleaning and pile-cutting device and its construction method for abandoned pile foundations. Background Technology

[0002] Against the backdrop of port development shifting from an extensive expansion model to an intensive quality improvement approach, the renovation, expansion, and upgrading of old wharves are highly compatible with the needs of urban renewal for handling abandoned land structures, jointly becoming important pathways for building resource-saving and environmentally friendly ports and urban spaces. Currently, renovation projects in both scenarios typically require treatment of the original pile foundations. The general process usually includes demolishing the original superstructure and pile foundations, excavating the site (or mud surface) to the new design elevation, cutting off the old pile foundations, and driving new pile foundations according to the new load-bearing and functional requirements to complete the renovation, expansion, or upgrading.

[0003] Existing pile cutting techniques face significant challenges in both scenarios: efficiently, accurately, and with minimal disruption, cleaning and cutting off old piles in dense, complex environments. In underwater port environments, existing techniques typically involve first using grab dredgers to clear the soil around the pile foundations, then using hydraulic pile cutters to cut the old piles. However, old wharf piles are usually densely packed, and the grab buckets are large, making it difficult to thoroughly clean the soil between piles, resulting in incomplete pile cutting in one go, often requiring two or more cuts. Furthermore, whether underwater or on land, if the surrounding geological conditions are hard silt or fine soil, a vibratory hammer is needed to reach the designated depth. In land-based urban renewal scenarios, while there are no underwater operational difficulties, the same challenges exist: dense pile foundations, complex surrounding backfill soil, limited construction space, and stringent environmental requirements. Traditional land-based pile cutting methods are difficult to implement in dense pile clusters. Failure to cut the old piles to the design elevation will directly lead to significant interference between the old and new piles, severely impacting the subsequent construction progress of new piles and the overall project's smooth progress. Summary of the Invention

[0004] The purpose of this invention is to provide a mud-cleaning and pile-cutting device for abandoned pile foundations that solves the above-mentioned technical problems.

[0005] Another object of the present invention is to provide a method for construction of soil removal and pile cutting using the above-mentioned soil removal and pile cutting equipment for abandoned pile foundations.

[0006] Therefore, the technical solution of the present invention is as follows:

[0007] A sludge-removing and pile-cutting device for abandoned pile foundations comprises a casing assembly, a hydraulic pile-cutting and shearing mechanism, and a sludge-removing reamer assembly. The casing assembly includes a cylindrical inner sleeve. The hydraulic pile-cutting and shearing mechanism includes a hydraulic shearing device, the top of which is connected to the bottom of the cylindrical inner sleeve, and the bottom of which is connected to the support cylinder of the sludge-removing reamer assembly via a rotary mechanism. The support cylinder has a perforated sidewall, and its outer wall is provided with spiral reamers arranged from top to bottom, with several third flow holes spaced apart on the reamer face from one end to the other. Multiple first shovel teeth are spaced apart on the lower end face of the spiral reamers. A toothed blade is provided on the bottom outer wall of the support cylinder opposite to the multiple first shovel teeth, consisting of a conical handle vertically fixed to the outer wall of the support cylinder and multiple second shovel teeth spaced apart horizontally on the handle. The multiple first shovel teeth and multiple second shovel teeth are staggered on the circumferential surface, allowing the sludge-removing path of the multiple first shovel teeth and multiple second shovel teeth to cover the entire annular surface.

[0008] Furthermore, the casing assembly also includes a tapered outer sleeve, which is fitted onto the outer side of the cylindrical inner sleeve with an annular gap, and is fixedly connected to the cylindrical inner sleeve by multiple connecting ribs arranged in the circumferential direction; the lower outer diameter of the tapered outer sleeve is adapted to the outer diameter of the hydraulic pile cutting shearing mechanism.

[0009] Furthermore, a number of first flow holes are provided on the side wall of the conical jacket, and the number of first flow holes are evenly distributed on the side wall of the conical jacket.

[0010] Furthermore, the top side of the cylindrical inner sleeve extends to the outside of the conical outer sleeve, and two connecting lugs are symmetrically fixed on its top outer wall.

[0011] Furthermore, the hydraulic shearing device includes a blade body, with its two sides respectively installed in the horizontal guide grooves of two guide frames to slide back and forth in the horizontal direction; a blade holder is fixed at one end of each of the two guide frames and is arranged opposite to the blade edge side of the blade body; a blade holder is arranged adjacent to the blade holder, which includes two pull rods, one end of which is connected and fixed to a connecting rod, and the other end is respectively inserted into the horizontal guide grooves of the two guide frames and fixedly connected to the blade body; two hydraulic cylinders are respectively fixed to the outer surfaces of the two guide frames through cylinder barrels, and the movable push rod ends of the two cylinders are hinged to the two ends of the connecting rod to drive the blade holder to drive the blade body to move synchronously.

[0012] Furthermore, an auxiliary guide frame is fixed on the back side of the tool holder. The auxiliary guide frame has horizontal guide grooves on both sides and is connected to the horizontal guide grooves of the guide frame, so that the two tie rods of the tool holder are simultaneously inserted into the two horizontal guide grooves of the auxiliary guide frame.

[0013] Furthermore, the slewing mechanism includes a slewing bearing and a reducer; the slewing bearing is connected to the bottom of the hydraulic shearing equipment via its inner ring; the reducer is fixed to the adjacent side of the hydraulic shearing equipment, and its output shaft end is provided with a gear, which meshes with the external gear ring on the outer ring of the slewing bearing.

[0014] Furthermore, an upper support plate is horizontally fixed to the top side of the hydraulic shearing equipment, allowing the hydraulic shearing equipment to be connected to the cylindrical inner sleeve through the upper support plate; a lower support plate is horizontally fixed to the bottom side of the hydraulic shearing equipment, allowing the hydraulic shearing equipment to be connected to the inner ring of the slewing bearing through the lower support plate; both the upper and lower support plates are annular plates with a central hole diameter and shape that are adapted to the outer diameter and shape of the pile foundation, so as to provide auxiliary support and straightening for the pile foundation passing through them; multiple second flow holes are opened along the circumferential direction on the annular plate surface of the upper support plate.

[0015] Furthermore, a conical guide tube is also fitted inside the support tube, which is coaxially arranged with the support tube in such a way that there is an annular gap. The two are fixedly connected by multiple connecting ribs arranged in the circumferential direction. The inner diameter of the conical guide tube gradually decreases from bottom to top, and the shape and size of the radial section are adapted to the pile foundation to be cut off.

[0016] Furthermore, the dredging cutter assembly is also equipped with a high-pressure water impact system, which includes multiple water spray pipes arranged inside the support cylinder and evenly distributed along the circumference. Each water spray pipe is equipped with multiple high-pressure nozzles at intervals, and the high-pressure nozzles are arranged at an angle downwards.

[0017] A method for constructing mud-removing and pile-cutting foundations using the aforementioned mud-removing and pile-cutting equipment includes the following steps:

[0018] S1. Transport the mud-cleaning and pile-cutting equipment to the site and position it. Use lifting equipment to lift the mud-cleaning and pile-cutting equipment vertically or obliquely, and fit it into the top side of the foundation pile to be cut off.

[0019] S2. The mud-cleaning and pile-cutting equipment slides down along the foundation pile under the action of gravity until it falls to the soil surface. The high-pressure water impact system and reducer are started. The high-pressure water impacts the soil surface and the spiral cutter rotates to clean the mud and excavate a pit on the soil surface around the pile. By selectively supplementing manual excavation, the size of the pit is ensured to be larger than the size of the equipment, that is, to meet the working space required for the hydraulic shearing equipment to cut the foundation pile. The mud-cleaning and pile-cutting equipment continues to descend below the mud surface until the hydraulic shearing equipment reaches the designated pile-cutting position.

[0020] S3. Start the two hydraulic shear cylinders to extend the movable push rod outward and drive the cutter body to cut off the foundation pile along the elevation position; the cutter head remains in the cutting state, so that the cut pile foundation is temporarily stored in the casing assembly;

[0021] S4. The lifting equipment lifts the mud-cleaning and pile-cutting equipment, while using high-pressure water to impact the soil surface and controlling the spiral cutter to rotate in the opposite direction to provide lifting force, so as to lift and transport it to the designated location.

[0022] S5. Activate the two hydraulic shear cylinders to retract the movable push rod inward to its initial state and remove the cut-off pile foundation.

[0023] Compared with existing technologies, this sludge removal and pile cutting equipment for abandoned pile foundations is designed for old pile foundations driven into hard silt and / or silt in underwater or onshore soil with relatively hard geology. The equipment and its supporting construction methods can cut the piles to the design elevation in one go without the need for auxiliary equipment such as vibratory hammers. The excavation and descent are achieved directly through the rotary cutting force of the sludge removal cutter assembly combined with high-pressure water impact. At the same time, the equipment can also temporarily store the cut piles in it, and lift them out of the water and transport them with the whole equipment, avoiding the cut piles from falling to the bottom of the water and forming obstacles and secondary salvage. This effectively reduces construction procedures, reduces equipment wear and tear, and greatly improves the efficiency of pile cutting operations in hard soil. It can be widely used in the renovation, expansion and upgrading of old docks and abandoned structures on land. It can also complete the goal of efficient and accurate pile cutting operations under complex construction conditions such as complex backfill soil and limited working space. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the mud-removing and pile-cutting equipment for abandoned pile foundations in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the casing assembly of a mud-cleaning and pile-cutting device for abandoned pile foundations in an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the hydraulic pile cutting shear mechanism of the mud-cleaning and pile-cutting equipment for waste pile foundations in an embodiment of the present invention;

[0027] Figure 4 This is a partial structural schematic diagram of the hydraulic pile cutting shear mechanism of the mud-cleaning and pile-cutting equipment for waste pile foundations in an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the dredging cutter assembly of the dredging and pile cutting equipment for abandoned pile foundations in an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the support cylinder and guide cover in the dredging cutter assembly of the dredging and pile cutting equipment for waste pile foundations in an embodiment of the present invention. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the following embodiments are by no means intended to limit the present invention.

[0031] Example 1

[0032] See Figure 1Based on the pile cutting operation environment of the underwater abandoned pile foundation of the old wharf, the structure and application method of the dredging and pile cutting equipment are described.

[0033] The sludge removal and pile cutting equipment for abandoned pile foundations consists of a casing assembly 1, a hydraulic pile cutting and shearing mechanism 2, and a sludge removal and cutting tool assembly 3 connected sequentially from top to bottom.

[0034] See Figure 2 The sleeve assembly 1 includes a conical outer sleeve 101 and a cylindrical inner sleeve 102. The cylindrical inner sleeve 102 is fitted inside the conical outer sleeve 101 with an annular gap and is coaxial with the conical outer sleeve 101. The upper and lower parts of the two are fixedly connected as a whole by multiple connecting ribs arranged evenly and radially along the circumference. In this embodiment, the cylindrical inner sleeve 102 is a cylindrical body with an inner diameter slightly larger than the outer diameter of the pile foundation. It is used to temporarily store the cut-off part of the pile foundation so that it can be lifted onto the ship with the equipment without secondary salvage.

[0035] The conical outer sleeve 101 is designed so that its lower outer diameter is adapted to the outer diameter of the hydraulic pile cutting shearing mechanism 2. This allows the conical outer wall to dissipate some of the accumulated soil during equipment lifting, reducing the lifting resistance caused by the top surface of the hydraulic pile cutting shearing mechanism 2. As a preferred embodiment, the conical outer sleeve 101 has several first flow holes evenly distributed on its sidewall. These holes, combined with the annular cavity structure formed between the conical outer sleeve 101 and the cylindrical inner sleeve 102, create radial and circumferential flow channels for water and mud flow, respectively. This further reduces the overall lifting resistance of the equipment after pile cutting when it is lifted.

[0036] The top side of the cylindrical inner sleeve 102 extends to the outside of the conical outer sleeve 101, and two connecting lugs 103 are symmetrically fixed on the top outer wall of the cylindrical inner sleeve 102. The two connecting lugs 103 are respectively connected to the main hook and auxiliary hook of the ship's lifting equipment through slings, so that the underwater sludge cleaning and pile cutting equipment can be vertically lowered or obliquely lifted with the cooperation of the main hook and auxiliary hook. The bottom end of the cylindrical inner sleeve 102 is provided with a first connecting flange for fixed connection with the hydraulic pile cutting shearing mechanism 2.

[0037] See Figure 3 and Figure 4 The hydraulic pile cutting shearing mechanism 2 includes a hydraulic shearing device 201, a slewing bearing, and a reducer 205. The hydraulic shearing device 201 is used to cut piles at designated locations on the pile foundation. The slewing bearing is fixed to the bottom of the hydraulic shearing device 201 and is used to connect with the dredging cutter assembly 3 below. The reducer 205 is driven by the slewing bearing to drive the slewing bearing to rotate in the forward or reverse direction.

[0038] Specifically, the hydraulic shearing device 201 includes a blade body 2011, a guide frame 2012, a hydraulic cylinder 2013, a blade holder 2014, and a blade support 2015. Two guide frames 2012 are arranged parallel to each other with their horizontal guide grooves facing each other. The blade body 2011 is respectively embedded in the horizontal guide grooves of the two guide frames 2012 on both sides, allowing it to slide back and forth horizontally on the guide frames 2012. The blade support 2015 is located on one end of each of the two guide frames 2012 and is positioned opposite to the cutting edge of the blade body 2011. The blade holder 2014 includes two tie rods, one end of which is inserted from the blade support 2015 into the horizontal guide grooves of the two guide frames 2012 and fixedly connected to the blade body 2011; the other end of each tie rod is fixedly connected to a connecting rod. Considering that the blade body 2011 completes the cutting of the pile foundation, and... After docking with the cutter holder 2015, the cutter post 2014 extends almost completely beyond the guide frame 2012. Therefore, to ensure that the guide frame 2012 remains horizontal, an auxiliary guide frame 2016 is fixed to the back of the cutter holder 2015. The auxiliary guide frame 2016 has horizontal guide grooves on both sides, which communicate with the horizontal guide grooves of the guide frame 2012, allowing the two tie rods of the cutter post 2014 to be simultaneously inserted into the horizontal guide grooves on both sides of the auxiliary guide frame 2016. Two hydraulic cylinders are provided, with their cylinder barrels positioned along the guide frame 2012 and fixed to the outside of the two guide frames 2012. The ends of their movable push rods are fixed to both ends of the connecting rod of the cutter post 2014, so that the two hydraulic cylinders synchronously drive their movable push rods to extend and retract, thereby driving the cutter post 2014 to move the cutter body and cut the pile foundation at a designated location. The cylinder barrels of the two hydraulic cylinders extend to the ship via hydraulic oil pipes and are connected to the ship's hydraulic pump station to supply hydraulic oil.

[0039] In practical applications, the hydraulic shearing device 201 initially has its movable push rod of the hydraulic cylinder fully retracted. At this time, the cutter body 2011 is positioned away from the cutter holder 2015, and the distance between the cutter body 2011 and the cutter holder 2015 meets the requirements for the pile foundation to pass through. Subsequently, when the hydraulic shearing device 201 falls to the target cutting position of the pile foundation, the movable push rod of the hydraulic cylinder extends outward, driving the cutter body 2011 to move towards the cutter holder 2015 and perform a shearing action on the pile foundation. After the cutting is completed, the cutter body 2011 is inserted into the cutter holder 2015. At this time, the cut pile foundation is temporarily stored in the sleeve assembly under the blocking effect of the cutter body 2011. This hydraulic pile cutting shearing mechanism 2, through a brand-new structural design, makes its structure more concentrated and smaller in size compared to traditional hydraulic shearing devices. Even when maintaining the cutting state, the structural design of the cutter holder will not increase the lifting resistance due to its outward extension, thus ensuring that the device maintains low motion resistance during both the lowering and lifting processes.

[0040] To facilitate the connection of the hydraulic pile cutting shearing mechanism 2 with the upper sleeve assembly 1 and the lower dredging reamer assembly 3, a connecting shell is also provided on the outside of the hydraulic shearing device 201, which specifically includes an upper support plate 202 and a lower support plate. The upper support plate 202 is horizontally fixed to the top side of the hydraulic shearing device 201, and the lower support plate 204 is horizontally fixed to the bottom side of the hydraulic shearing device 201. Since the pile foundation to be cut is a square pile, both the upper support plate 202 and the lower support plate 204 are annular plates with a square central hole. The size of the square central hole is adapted to the outer diameter of the pile foundation, so as to play an auxiliary support and straightening role when it is sleeved on the outside of the pile foundation. A second connecting flange 203 is fixed in the center of the upper support plate 202, which mates with the first connecting flange. The flange's central hole diameter is larger than that of the square central hole, allowing the upper support plate 202 to be detachably and fixedly connected to the bottom of the cylindrical inner sleeve 102 via a flange connection, thus achieving a fixed connection between the sleeve assembly 1 and the hydraulic pile cutting shearing mechanism 2. Multiple second flow holes 207 are formed along the circumference on the annular surface of the upper support plate 202 to allow water and mud to flow through, reducing the overall lifting resistance of the equipment after pile cutting. A ring of mounting holes is formed on the surface of the lower support plate 204 to mate with the pin holes on the inner ring of the slewing bearing.

[0041] To ensure a secure connection between the upper support plate 202 and the lower support plate 204 and the hydraulic shearing equipment 201, the guide frame 2012 and the cutter holder 2015 are fixed on two vertically and symmetrically arranged strip mounting plates. At the same time, multiple square mounting plates are spaced and fixed on the outside of each hydraulic cylinder. The square mounting plates are at the same height as the strip mounting plates, so that the upper support plate 202 and the lower support plate 204 are fixedly connected to the hydraulic shearing equipment 201 through the strip mounting plates and the square mounting plates, respectively.

[0042] The slewing bearing is located below the lower support plate 204. Its inner ring is fixedly connected to the bottom surface of the lower support plate 204 by bolts passing through the inner ring connection hole and the mounting hole of the lower support plate 204. Mounting holes 206 for mounting and setting the reducer are opened on the upper support plate 202 and the lower support plate 204. The reducer 205 is set with the output shaft facing vertically downward. The outer ring of the slewing bearing has an external gear ring. The reducer 205 meshes with the external gear ring of the outer ring of the slewing bearing through the drive gear fixed at the end of its output shaft, so as to drive the outer ring of the slewing bearing to rotate relative to the inner ring, that is, to realize the rotation of the dredging reamer assembly 3 relative to the hydraulic shearing device 201. Generally, only one reducer 205 is set, but two mounting holes 206 are opened on the upper support plate 202 and the lower support plate 204 to reserve a position for one reducer. In case of insufficient rotation power of the reamer in hard soil, another reducer 205 can be installed to provide double the driving force.

[0043] In practical applications, since the working environment of this equipment is underwater, all components of the hydraulic pile cutting shearing mechanism 2 need to be waterproofed in advance, including but not limited to setting waterproof protective shells for power components and using waterproof seals; for example, the hydraulic cylinder is a waterproof hydraulic cylinder, the reducer 205 is sealed in a waterproof shell, and extends to the ship and is connected to the power supply equipment through a waterproof cable, etc.

[0044] See Figure 5 and Figure 6 The dredging reamer assembly 3 includes a support cylinder 301, which is a cylindrical body with hollowed-out side walls. The outer wall of the top of the support cylinder 301 is provided with an annular connecting plate 306, and the plate surface is provided with mounting holes that are compatible with the outer ring connecting holes. The support cylinder 301 is fixed to the bottom surface of the lower support plate 204 by bolts passing through its mounting holes and the outer ring connecting holes, thereby realizing the rotatable connection between the dredging reamer assembly 3 and the hydraulic shearing device 201.

[0045] A spiral reamer 302 is installed and fixed from top to bottom on the outer wall of the support cylinder 301. Several third flow holes 305 are spaced apart on the blade surface of the spiral reamer 302 from one end to the other, serving as pressure relief holes. These holes cooperate with the perforations on the side wall of the support cylinder 301 to increase the agitation intensity, facilitating mud discharge, and reducing clay adhesion, thus promoting clay breakdown. Four first shovel teeth 304 are fixed at intervals on the end face of the lower end of the spiral reamer 302. Correspondingly, a toothed blade 303 is installed on the bottom outer wall of the support cylinder 301 on the side opposite to the four first shovel teeth 304. This toothed blade 303 consists of a conical handle vertically fixed to the outer wall of the support cylinder 301 and three second shovel teeth fixed horizontally at intervals on the handle. The four first shovel teeth 304 and the three second shovel teeth are staggered on the circumferential surface, allowing the mud-cleaning paths of the four first shovel teeth 304 and the three second shovel teeth to cover a complete annular surface.

[0046] In practical applications, the spiral reamer 302, besides breaking up the surrounding mud and soil, also has a downward propulsion function. Combined with the weight of the equipment, it allows the entire device to automatically drill downwards as the reamer rotates. During subsequent lifting operations, the dredging reamer assembly 3 can be driven to rotate in the opposite direction to provide some lifting force. Furthermore, when encountering significant resistance in forward propulsion, it can briefly reverse and then forward again, often overcoming obstacles. The multiple first shovel teeth 304 and multiple second shovel teeth located on both sides of the bottom of the spiral reamer 302 provide auxiliary and enhanced effects to the aforementioned functions of the spiral reamer 302. Simultaneously, the symmetrical design of this structure ensures balanced force distribution on the spiral reamer 302, reducing vibration.

[0047] A tapered guide cylinder 307 is also fitted inside the support cylinder 301. It is coaxially arranged with the support cylinder 301 with an annular gap. The two are fixedly connected as a whole by multiple connecting ribs arranged evenly and radially along the circumference. In this embodiment, since the pile foundation to be cut is a square pile, the tapered guide cylinder 307 adopts a cylinder with an inner diameter that gradually decreases from bottom to top, and a square upper radial cross section and a circular lower radial cross section, so as to guide the top side of the pile foundation into the hydraulic shearing device 201.

[0048] The dredging cutter assembly 3 is also equipped with a high-pressure water impact system, which includes multiple water spray pipes evenly distributed along the circumference of the conical guide cylinder 307 and vertically fixed to the outer wall of the conical guide cylinder 307. Each water spray pipe has multiple high-pressure nozzles spaced from top to bottom, with the high-pressure nozzles angled downwards. After the dredging cutter assembly 3 is screwed into the silt layer, high-pressure water is sprayed downwards onto the silt to flush it into mud, increasing the efficiency of the downward rotation of the spiral cutter 302. Each water spray pipe is connected to a long high-pressure hose at its top. The long high-pressure hoses are bundled together and extend to the ship to connect with the ship's water pump, enabling the supply of high-pressure water.

[0049] It should also be noted that, since the dredging and pile cutting equipment for abandoned pile foundations is installed on the outside of the abandoned pile in actual application, the abandoned pile can be used to bear the counter torque generated when the dredging reamer assembly 3 rotates, which will not cause the equipment to reverse, and ensure that the dredging reamer assembly 3 rotates normally to produce a cutting effect.

[0050] Example 2

[0051] Based on the description of Embodiment 1 above, the specific operation process of the underwater straight or inclined pile cleaning and cutting construction method using this mud-cleaning and pile-cutting equipment is described as follows:

[0052] S1. Crane vessels and barges carrying sludge removal and pile cutting equipment enter the site and take up their positions. Crane vessels lift the sludge removal and pile cutting equipment vertically or obliquely, and then lower it below the water surface, align it and fit it into the top side of the foundation pile to be cut off.

[0053] Specifically, when the foundation pile to be cut off is a straight pile, the main hook of the crane vessel is directly attached to the slings that pass through and connect to the two connecting lugs on the top side of the mud-clearing pile cutting equipment, so as to achieve vertical lifting and vertical lowering; while when the foundation pile to be cut off is an inclined pile, the main hook and auxiliary hook of the crane vessel are respectively attached to the slings that pass through and connect to the two connecting lugs on the top side of the mud-clearing pile cutting equipment, so as to first lift vertically, and then adjust the lifting height in mid-air so that the mud-clearing pile cutting equipment is set at an angle, and the angle of inclination is consistent with the angle of inclination of the inclined pile to be cut off.

[0054] S2. The mud-cleaning and pile-cutting equipment slides down along the foundation pile under the action of gravity until it falls to the underwater mud surface. At this time, the high-pressure water impact system and reducer are started to drive the spiral cutter to rotate and clean the mud while using high-pressure water to impact the silt. The mud-cleaning and pile-cutting equipment continues to descend below the mud surface until the hydraulic shearing equipment 201 reaches the designated pile-cutting position. Then the high-pressure water impact system and reducer are turned off.

[0055] S3. Start the two hydraulic shear cylinders to extend the movable push rod outward and drive the cutter body to cut off the foundation pile along the elevation position; the cutter head remains in the cutting state, so that the cut pile foundation is temporarily stored in the casing assembly;

[0056] S4. The crane vessel lifts the mud-clearing and pile-cutting equipment, and uses high-pressure water to impact the silt and controls the reverse rotation of the auger to provide lifting force until the mud-clearing and pile-cutting equipment is successfully lifted above the water surface.

[0057] S5. The crane ship rotates its boom to horizontally lift the mud-clearing and pile-cutting equipment to the deck of the barge and slowly lowers it vertically. When the bottom of the mud-clearing and pile-cutting equipment is close to the deck, the two hydraulic shear cylinders are activated to retract the movable push rod, and the cut pile foundation in the casing assembly falls onto the deck under the action of gravity.

[0058] S6. Using the cut-off pile foundation as the rotation center, slowly lower the top side of the mud-clearing and pile-cutting equipment until it is leveled on the wooden blocks of the barge deck.

[0059] S7. Release the wire rope of the winch on the barge deck and tie it tightly to the cut-off pile foundation. Then drive the winch to tighten the wire rope to pull the cut-off pile foundation out of the mud-clearing and pile-cutting equipment.

Claims

1. A soil-cleaning and pile-cutting device for abandoned pile foundations, characterized in that, It consists of a casing assembly (1), a hydraulic pile cutting and shearing mechanism (2), and a dredging reamer assembly (3); wherein, the casing assembly (1) includes a cylindrical inner sleeve (102); the hydraulic pile cutting and shearing mechanism (2) includes a hydraulic shearing device (201), the top side of which is connected to the bottom end of the cylindrical inner sleeve (102), and the bottom side is connected to the support cylinder (301) of the dredging reamer assembly (3) through a rotary mechanism. The support cylinder (301) has a hollow side wall, and its outer wall is provided with spiral reamers (302) from top to bottom, and a number of third flow holes (305) are spaced apart from one end to the other on the blade surface. Multiple first shovel teeth (304) are spaced apart on the lower end face of the spiral reamer (302). A toothed blade (303) is provided on the bottom outer wall of the support cylinder (301) opposite to the multiple first shovel teeth (304). The toothed blade (303) is composed of a conical handle that is vertically fixed on the outer wall of the support cylinder (301) and multiple second shovel teeth that are spaced apart in the horizontal direction. The multiple first shovel teeth (304) and the multiple second shovel teeth are staggered on the circumferential surface so that the mud-cleaning path of the multiple first shovel teeth (304) and the multiple second shovel teeth can cover the entire annular surface.

2. The soil removal and pile cutting equipment for abandoned pile foundations according to claim 1, characterized in that, The casing assembly (1) also includes a tapered outer sleeve (101), which is fitted on the outside of the cylindrical inner sleeve (102) with an annular gap, and is fixedly connected to the cylindrical inner sleeve (102) by multiple connecting ribs arranged in the circumferential direction; the lower outer diameter of the tapered outer sleeve (101) is adapted to the outer diameter of the hydraulic pile cutting shearing mechanism (2).

3. The soil removal and pile cutting equipment for abandoned pile foundations according to claim 2, characterized in that, The top side of the cylindrical inner sleeve (102) extends to the outside of the conical outer sleeve (101), and two connecting lugs (103) are symmetrically fixed on its top outer wall.

4. The soil removal and pile cutting equipment for abandoned pile foundations according to claim 1, characterized in that, The hydraulic shearing device (201) includes a blade body, which is installed on both sides in the horizontal guide grooves of two guide frames to slide back and forth in the horizontal direction; a blade holder is fixed at one end of each guide frame and is arranged opposite to the blade edge of the blade body; a blade holder is arranged on the adjacent side of the blade holder, which includes two pull rods, one end of which is connected and fixed to a connecting rod, and the other end is inserted into the horizontal guide grooves of the two guide frames and fixedly connected to the blade body; two hydraulic cylinders are fixed to the outer surfaces of the two guide frames through cylinder barrels, and the movable push rod ends of the two cylinders are hinged to the two ends of the connecting rod to drive the blade holder to move synchronously with the blade body.

5. The soil removal and pile cutting equipment for abandoned pile foundations according to claim 4, characterized in that, An auxiliary guide frame is also fixed on the back side of the tool holder. The auxiliary guide frame has horizontal guide grooves on both sides and is connected to the horizontal guide grooves of the guide frame, so that the two tie rods of the tool holder are simultaneously inserted into the two horizontal guide grooves of the auxiliary guide frame.

6. The soil removal and pile cutting equipment for abandoned pile foundations according to claim 1, characterized in that, The slewing mechanism includes a slewing bearing and a reducer; the slewing bearing is connected to the bottom of the hydraulic shearing device (201) through its inner ring; the reducer is fixed to the adjacent side of the hydraulic shearing device (201), and its output shaft end is provided with a gear, which meshes with the outer gear ring on the outer ring of the slewing bearing.

7. The soil removal and pile cutting equipment for abandoned pile foundations according to claim 1, characterized in that, The hydraulic shearing device (201) is horizontally fixed with an upper support plate (202) on its top side, so that the hydraulic shearing device (201) is connected to the cylindrical inner sleeve (102) through the upper support plate (202); the hydraulic shearing device (201) is horizontally fixed with a lower support plate (204) on its bottom side, so that the hydraulic shearing device (201) is connected to the inner ring of the slewing bearing through the lower support plate (204); the upper support plate (202) and the lower support plate (204) are both annular plates with the diameter and shape of the central hole adapted to the outer diameter and shape of the pile foundation, and multiple second flow holes (207) are opened along the circumferential direction on the annular plate surface of the upper support plate (202).

8. The soil removal and pile cutting equipment for abandoned pile foundations according to claim 1, characterized in that, A tapered guide tube (307) is also fitted inside the support tube (301), which is coaxially arranged with the support tube (301) in a manner with an annular gap. The two are fixedly connected by multiple connecting ribs arranged along the circumferential direction. The inner diameter of the tapered guide tube (307) gradually decreases from bottom to top, and the shape and size of the radial section are adapted to the pile foundation to be cut off.

9. The soil removal and pile cutting equipment for abandoned pile foundations according to claim 1, characterized in that, The dredging cutter assembly (3) is also equipped with a high-pressure water impact system, which includes multiple water spray pipes arranged inside the support cylinder (301) and evenly distributed along the circumference. Each water spray pipe is provided with multiple high-pressure nozzles at intervals, and the high-pressure nozzles are arranged obliquely downwards.

10. A method for constructing a soil removal and pile cutting project using the soil removal and pile cutting equipment for abandoned pile foundations as described in any one of claims 1-9, characterized in that the steps include... include: S1. Transport the mud-cleaning and pile-cutting equipment to the site and position it. Use lifting equipment to lift the mud-cleaning and pile-cutting equipment vertically or obliquely, and fit it into the top side of the foundation pile to be cut off. S2. The mud-cleaning and pile-cutting equipment slides down along the foundation pile under the action of gravity until it falls to the soil surface; the high-pressure water impact system and reducer are started, and the pit is dug on the soil surface around the pile by using high-pressure water impact on the soil surface and the spiral cutter to clean the mud. The pit size is ensured to be larger than the equipment size, so that the mud-cleaning and pile-cutting equipment continues to descend below the mud surface until the hydraulic shearing equipment reaches the designated pile-cutting position. S3. Start the two hydraulic shear cylinders to extend the movable push rod outward and drive the cutter body to cut off the foundation pile along the elevation position; the cutter head remains in the cutting state, so that the cut pile foundation is temporarily stored in the casing assembly; S4. The lifting equipment lifts the mud-cleaning and pile-cutting equipment, while using high-pressure water to impact the soil surface and controlling the spiral cutter to rotate in the opposite direction to provide lifting force, so as to lift and transport it to the designated location. S5. Activate the two hydraulic shear cylinders to retract the movable push rod inward to its initial state and remove the cut-off pile foundation.

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