Mud cleaning and pile cutting construction method for underwater straight pile or inclined pile

Abstract

The invention discloses a mud cleaning and pile cutting construction method for underwater straight piles or inclined piles, which is realized on the basis of underwater mud cleaning and pile cutting equipment consisting of a sleeve assembly, a hydraulic shearing mechanism and a mud cleaning mechanism which are sequentially connected from top to bottom. A pipeline group consisting of a hydraulic oil pipe, an upper flushing pipe and a lower flushing pipe is arranged on the water tank; the hydraulic shearing mechanism comprises hydraulic shearing equipment fixed in the protective sleeve box, a conical sleeve is arranged under a shearing through hole, and a conical outer sleeve is fixed to the outer side of the conical sleeve in a sleeving mode and fixed to the bottom side of the protective sleeve box; a plurality of obliquely downward vertical flushing holes and a plurality of obliquely upward transverse flushing holes are formed in the upper side and the lower side of the side wall of each side of the conical outer sleeve at intervals in the horizontal direction, and the water inlet is formed in the side wall of any side of the conical outer sleeve; according to the construction method, the pile cutting construction efficiency is high, a newly-added dredging operation space is reserved after the pile foundation is cut off, and the pile cutting and dredging construction efficiency and quality are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of wharf reconstruction and expansion construction technology, and in particular to a method for underwater straight or inclined pile cleaning and pile cutting construction. Background Technology

[0002] Under the rigid constraints of resources such as shoreline, land, and water area, port development needs to abandon the extensive expansion model and shift towards a path of quality improvement. The renovation, expansion, and upgrading of wharves, without significantly increasing resource consumption, can significantly enhance berthing capacity, becoming an important approach to building resource-saving and environmentally friendly ports.

[0003] Currently, the renovation, expansion, and upgrading of wharves usually require the demolition of the original wharf's superstructure and pile foundation, the excavation of the original wharf's mud surface to the new design cross-section line, the removal of the old wharf's pile foundation, and the driving of new pile foundations to complete the renovation, expansion, or upgrading.

[0004] However, wharf pile foundations are typically built in densely packed areas, usually requiring the use of grab dredgers for dredging. However, due to the large size of the grab buckets, it is difficult to clear the soil around the piles, resulting in pile cutting not being completed to the designed elevation in one go, necessitating secondary pile cutting, which significantly impacts construction efficiency and increases construction costs substantially. Furthermore, if the pile foundations cannot be cut to the designed elevation, there will inevitably be significant interference between the new and old pile foundations, greatly affecting the subsequent construction progress of new pile foundations, making wharf reconstruction, expansion, and upgrades a challenging project. Summary of the Invention

[0005] The purpose of this invention is to provide a method for underwater straight or inclined pile construction by clearing mud and cutting piles to solve the above-mentioned technical problems.

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

[0007] A method for underwater straight or inclined pile cleaning and cutting construction includes an underwater cleaning and cutting equipment, which consists of a casing assembly, a hydraulic shearing mechanism, and a cleaning mechanism connected sequentially from top to bottom. The casing assembly includes a casing with a pipeline group installed on it. The hydraulic shearing mechanism includes a hydraulic shearing device fixed inside a protective casing. The top and bottom surfaces of the protective casing have through holes that communicate with the shearing through holes of the hydraulic shearing device. The casing is coaxially arranged with the through holes on the protective casing and vertically fixed to the top surface of the protective casing. The pipeline group consists of multiple hydraulic oil pipes, at least one upper flushing pipe, and at least one lower flushing pipe. The upper sections of the pipes are arranged vertically side by side on the casing wall. The lower sections of the upper flushing pipes are evenly distributed in a serpentine bend on the top surface of the protective casing, with the other end closed, and several upward-facing nozzles are spaced apart on the lower section. The lower sections of the multiple hydraulic oil pipes pass through the top surface of the protective casing and connect with the hydraulic... The hydraulic shear cylinders on the pressure shearing equipment are connected to the oil circuit ports; the lower section of the flushing pipe is connected to the inlet of the sludge cleaning mechanism via a protective sleeve; the sludge cleaning mechanism includes a conical sleeve and a conical outer sleeve; the conical sleeve is a cylindrical structure with an inner diameter that gradually increases from top to bottom, and it is located directly below the shearing through hole; the conical outer sleeve is an inverted trapezoidal structure with an inner diameter that gradually decreases from top to bottom, and it is fitted and fixed to the outside of the conical sleeve in a manner that creates an annular cavity with the conical sleeve, and fixed to the bottom side of the protective sleeve; multiple vertical flushing holes are spaced horizontally downward on the upper side of each side wall of the conical outer sleeve, and multiple horizontal flushing holes are spaced horizontally upward on the lower side of each side wall of the conical outer sleeve, so as to spray high-pressure water in the vertically downward direction and in the horizontal direction respectively; the inlet is opened on any side wall of the conical outer sleeve; the sludge cleaning and pile cutting construction steps for underwater straight piles or inclined piles are as follows:

[0008] S1. The crane vessel lifts an underwater dredging and pile cutting device with a vibratory hammer on top and lowers it to fit the straight or inclined pile to be cut.

[0009] S2. Start the vibratory hammer and pump high-pressure water downward through the water pipe so that the underwater mud-clearing and pile-cutting equipment can pass through the existing mud surface under the cutting action of the vibratory hammer and high-pressure water flow, and reach the designed pile-cutting elevation position of the mud surface.

[0010] S3. Start the hydraulic pump station and drive the hydraulic shearing equipment to cut off the straight pile to be removed along the elevation position, and keep its hydraulic shear head in the closed state so that the cut pile foundation is temporarily stored in the casing.

[0011] S4. The crane vessel lifts the underwater mud-clearing and pile-cutting equipment above the water surface, ensuring it is in a vertical position;

[0012] S5. The crane vessel horizontally transports the underwater mud-clearing and pile-cutting equipment to the top of the barge deck and slowly lowers it vertically to a distance of ≤1m from the bottom of the deck; the hydraulic pump station is started to drive the hydraulic shear head of the hydraulic shear equipment to open, so that the cut pile foundation in the casing falls onto the deck.

[0013] S6. Using the cut-off pile as the rotation center, slowly lower the underwater mud-cleaning and pile-cutting equipment until it is level.

[0014] S7. Use a winch wire rope to tightly bind the cut-off pile foundation and pull it out from the underwater mud-cleaning and pile-cutting equipment.

[0015] Furthermore, the inner diameter of the casing is larger than the outer diameter of the pile foundation; the length of the casing satisfies the requirement that when the equipment is underwater for sludge removal and pile cutting, the top side of the casing is always exposed above the water surface.

[0016] Furthermore, two sleeve lifting lugs are symmetrically arranged on the top side wall of the sleeve.

[0017] Furthermore, multiple triangular ribs are evenly distributed in the circumferential direction at the bottom end of the casing, and each triangular rib is fixed to the side wall of the casing and the top surface of the protective casing, respectively.

[0018] Furthermore, the hydraulic oil pipes, upper flushing water pipes, and lower flushing water pipes installed on the casing wall and protective casing are all fixed by pipe clamps; the pipe clamp is a strip-shaped plate with multiple clamping holes on one long side in the horizontal direction that are adapted to the number and size of the oil pipes and / or water pipes to be fixed.

[0019] Furthermore, the inner diameter of the top side of the tapered sleeve is the same as the inner diameter of the shearing through hole; the outer diameter of the top side of the tapered outer sleeve is the same as the bottom surface of the protective sleeve box, so as to fix it on the bottom edge of the protective sleeve box.

[0020] Furthermore, multiple vertically arranged reinforcing ribs are arranged at intervals along the transverse and longitudinal directions inside the conical outer sleeve to form a grid structure in the annular cavity between the conical outer sleeve and the conical tube; each reinforcing rib is provided with at least one connecting hole.

[0021] Furthermore, a steel reinforcement brush is provided on the lower side of the outer wall of each conical jacket, which consists of multiple rows of steel reinforcement groups. Each row of steel reinforcement groups consists of short steel bars that are equally spaced from one side of the side wall to the other side in the horizontal direction, and one end of each short steel bar is perpendicular to and fixed on the outer wall of the conical jacket.

[0022] Further, in step S1, for straight piles, the crane vessel lifts an underwater dredging and pile cutting device with a vibratory hammer on top, and then lowers it below the water surface to align and fit the straight pile to be cut; for inclined piles, the crane vessel lifts an underwater dredging and pile cutting device with a vibratory hammer on top, and simultaneously connects it to the casing lifting lug via a lifting rope. By adjusting the length of the lifting rope, the inclination angle of the underwater dredging and pile cutting device is made consistent with the inclination angle of the inclined pile, and then it is lowered below the water surface to align and fit the inclined pile to be cut.

[0023] Furthermore, in step S4, when the lifting vessel encounters obstruction while hoisting the underwater mud-clearing and pile-cutting equipment, the vibratory hammer is activated and high-pressure water is pumped upward through the water jet pipe to spray high-pressure water upward through each nozzle.

[0024] Compared with existing technical solutions, this underwater straight or inclined pile cleaning and cutting method is based on a newly designed underwater cleaning and cutting equipment and its supporting construction method. It can directly remove the pile foundation after cutting it to the design elevation, reducing the secondary pile cutting process and improving the efficiency of pile cutting construction. At the same time, this construction method can leave additional dredging space after the pile foundation is cut off, which greatly improves the efficiency of subsequent dredging and ensures the quality of dredging, effectively improving the efficiency and quality of pile cutting and dredging construction. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the underwater mud-clearing and pile-cutting equipment in an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the upper casing structure of the underwater mud-cleaning and pile-cutting equipment in Embodiment 1 of the present invention;

[0027] Figure 3 This is a schematic diagram of the lower structure of the underwater mud-cleaning and pile-cutting equipment in Embodiment 1 of the present invention;

[0028] Figure 4 This is a schematic diagram of the hydraulic shearing mechanism of the underwater mud-cleaning and pile-cutting equipment in Embodiment 1 of the present invention;

[0029] Figure 5 This is a schematic diagram of the mud-cleaning mechanism of the underwater mud-cleaning and pile-cutting equipment in Embodiment 1 of the present invention;

[0030] Figure 6 This is a schematic diagram of fitting the underwater mud-clearing and pile-cutting equipment into a straight pile in Embodiment 2 of the present invention;

[0031] Figure 7 This is a schematic diagram of the underwater mud-cleaning and pile-cutting equipment used in Embodiment 2 of the present invention for temporarily storing and cutting straight pile foundations;

[0032] Figure 8 This is a schematic diagram of the underwater sludge removal and pile cutting equipment releasing the cut-off pile foundation in Embodiment 2 of the present invention;

[0033] Figure 9 This is a schematic diagram of Embodiment 2 of the present invention, in which the underwater sludge removal and pile cutting equipment is placed flat on the deck wooden blocks of a barge and the pile foundation is pulled out by a winch;

[0034] Figure 10 This is a schematic diagram of fitting the underwater mud-clearing and pile-cutting equipment into the inclined pile in Embodiment 3 of the present invention;

[0035] Figure 11This is a schematic diagram of the underwater mud-cleaning and pile-cutting equipment used in Embodiment 3 of the present invention for lifting and temporarily storing the cut-off inclined pile foundation. Detailed Implementation

[0036] 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.

[0037] Example 1

[0038] See Figure 1 The underwater sludge removal and pile cutting equipment consists of a casing assembly 1, a hydraulic shearing mechanism 2, and a sludge removal mechanism 3, connected sequentially from top to bottom. To meet the actual needs of construction operations, the casing assembly, hydraulic shearing mechanism, and sludge removal mechanism are all assembled from steel components.

[0039] See Figure 2 The casing assembly 1 includes a vertically arranged casing 1-1 with an inner diameter larger than the outer diameter of the pile foundation and a length that matches the actual construction, so that when the equipment is cleaning mud and cutting piles underwater, the top side of the casing 1-1 is always exposed above the water surface.

[0040] A pipeline assembly is installed on the wall of casing 1-1, specifically consisting of two hydraulic oil pipes 1-2, one upper flushing water pipe 1-3, and one lower flushing water pipe 1-4. The two hydraulic oil pipes 1-2 are connected to the ship's hydraulic pump station at the top and to the two hydraulic shear cylinders 2-1 of the hydraulic shearing mechanism 2 at the bottom for pumping hydraulic oil. The upper flushing water pipe 1-3 is connected to the ship's water pump at the top and is installed on the top side of the hydraulic shearing mechanism 2 at the bottom to achieve upward spraying of high-pressure water to cut the soil and complete the upward movement of the mud cleaning mechanism. The lower flushing water pipe 1-4 is connected to the ship's water pump at the top and to the mud cleaning mechanism 3 at the bottom for pumping high-pressure water to the mud cleaning mechanism 3 to achieve downward movement by flushing and cleaning the mud.

[0041] Two sleeve lifting lugs 1-6 are symmetrically arranged on the top side wall of sleeve 1-1 to assist in the flipping or oblique lifting of sleeve 1-1.

[0042] See Figure 4The hydraulic shearing mechanism 2 includes a hydraulic shearing device for pile cutting. The hydraulic shearing device is a commercially available product. Its outer casing has a shearing through-hole, and one side wall of the shearing through-hole has a hydraulic shear head 2-2. This head can reciprocate along a track groove on the wall of the shearing through-hole to perform a shearing action. The outer casing also contains a hydraulic shearing cylinder 2-1, whose piston end is connected to the rear side of the hydraulic shear head 2-2. Under the pushing or retracting action of the hydraulic shearing cylinder 2-1, the hydraulic shear head 2-2 achieves shearing closure or shearing opening, thereby sequentially cutting and releasing the pile foundation. In this embodiment, the shearing through-hole is a square hole with a diameter slightly larger than the outer diameter of the pile foundation to be cut in actual construction. The shearing end length of the hydraulic shear head 2-2 matches the outer diameter of the pile foundation, and the load-bearing capacity for pile cutting pressure is set to ≥19t. Considering the large shearing end length, two sets of hydraulic shearing cylinders 2-1 are arranged in parallel to synchronously drive the pushing and retracting of the hydraulic shear head 2-2.

[0043] To facilitate the connection of the hydraulic shearing mechanism 2 with the upper sleeve assembly 1 and the lower mud-cleaning mechanism 3, and also to protect the hydraulic shearing equipment during construction, the hydraulic shearing equipment is fixed inside the protective sleeve box 2-3. The protective sleeve box 2-3 is a cubic box with an internal cavity larger than that of the hydraulic shearing equipment. The top and bottom surfaces of the box are respectively provided with through holes that communicate with the shearing through holes of the hydraulic shearing equipment, and the diameter of the through holes is larger than that of the shearing through holes, specifically the same as the inner diameter of the sleeve 1-1.

[0044] See Figure 3 The bottom end of the sleeve 1-1 is vertically arranged coaxially with the through hole on the protective sleeve box 2-3, and the bottom end is welded and fixed to the top surface of the protective sleeve box 2-3. As a preferred technical solution of this embodiment, multiple triangular ribs 1-7 are evenly distributed in the circumferential direction at the bottom end of the sleeve 1-1, and the two right-angled sides of each triangular rib 1-7 are vertically welded and fixed to the side wall of the sleeve 1-1 and the top surface of the protective sleeve box 2-3, respectively.

[0045] See Figure 3In the pipe arrangement of the casing assembly 1, the upper sections of the four pipes are arranged vertically side by side, and are positioned and fixed to the casing 1-1 wall by multiple pipe clamps 1-5 that are set at intervals from top to bottom and fixed to the casing 1-1 wall; the lower section of the upper flushing pipe 1-3 goes around the bottom wall of the casing 1-1 to the top surface of the protective casing 2-3 located on the adjacent side of the casing 1-1, and is evenly arranged on the top surface of the protective casing 2-3 in a serpentine bend, with the other end closed; the lower section of the upper flushing pipe 1-3 has several branch pipes at intervals on the pipe section located on the top surface of the protective casing 2-3, and each branch pipe has an opening facing upwards. The nozzle sprays high-pressure water upwards; the lower sections of the two hydraulic oil pipes 1-2 are wrapped around the bottom wall of the sleeve 1-1 to the top surface of the protective sleeve 2-3, so that the other ends of the two pipes are connected to the oil circuit ports of the two hydraulic shear cylinders 2-1 respectively and form a connection; the lower section of the lower flushing pipe 1-4 is laid along the wall of the protective sleeve 2-3 and is connected to the water inlet on the top side of the mud cleaning mechanism 3 and forms a connection; the hydraulic oil pipes 1-2, the upper flushing pipe 1-3 and the lower flushing pipe 1-4 laid on the top surface of the protective sleeve 2-3 are also fixed to the protective sleeve 2-3 by multiple pipe clamps 1-5 to achieve fixed position.

[0046] Specifically, the pipe clamping plate 1-5 is a strip-shaped plate with multiple horizontally protruding holes on one long side, corresponding to the number and size of the oil pipes and / or water pipes to be fixed. In practical applications, the oil pipes and / or water pipes to be fixed are inserted into the protruding holes on the pipe clamping plate 1-5, and then the long side of the pipe clamping plate 1-5 with the protruding holes is vertically welded and fixed to the outer wall of the sleeve 1-1 or the protective sleeve box 2-3, thereby completing the pipe fixing.

[0047] See Figure 5 The mud-cleaning mechanism 3 is connected to the bottom of the protective casing 2-3, and includes a conical sleeve 3-1 and a conical outer sleeve 3-2.

[0048] The tapered sleeve 3-1 is a cylindrical structure with an inner diameter that gradually increases from top to bottom. It is located directly below the shearing through hole, and its top inner diameter is the same as the inner diameter of the shearing through hole, serving as a guide mechanism to guide the pile foundation to be cut into the shearing through hole.

[0049] The conical sleeve 3-2 is fitted onto the outside of the conical sleeve 3-1. It is an inverted trapezoidal platform structure with an inner diameter that gradually decreases from top to bottom, formed by four obliquely arranged steel plates connected in sequence, so as to make it more conducive to drilling into the underwater mud surface. The top outer diameter of the conical sleeve 3-2 is the same as the bottom surface size of the protective sleeve box 2-3. It is connected and fixed to the hydraulic shearing mechanism 2 as a whole by welding it to the bottom edge of the protective sleeve box 2-3.

[0050] Multiple reinforcing ribs 3-6 are arranged at intervals along the horizontal and vertical directions inside the conical outer sleeve 3-2. Each reinforcing rib 3-6 is vertically arranged, and its two sides are welded and fixed to the inner wall of the conical outer sleeve 3-2 on the opposite side, between the inner wall of the conical outer sleeve 3-2 and the outer wall of the conical sleeve 3-1, between the outer wall of the conical sleeve 3-1 and the adjacent reinforcing rib 3-6, or between two reinforcing ribs 3-6, to construct a grid structure in the annular cavity between the conical outer sleeve 3-2 and the conical sleeve 3-1, ensuring that the conical outer sleeve 3-2 will not deform under pressure during actual construction. A water inlet is provided on the side wall of the conical outer sleeve 3-2 adjacent to the pipeline assembly and connected to the other end of the downflushing pipe 1-4. Correspondingly, each reinforcing rib 3-6 has at least one connecting hole, allowing high-pressure water inside the grid structure to flow sequentially through the connecting holes, filling the entire inner cavity of the conical outer sleeve 3-2 with high-pressure water.

[0051] Multiple vertical flushing holes 3-3 are spaced horizontally at intervals on the upper side of each side wall of the conical jacket 3-2, with the angle of each vertical flushing hole 3-3 matching the angle of the side wall of the conical jacket 3-2, so that the water jetting out from the vertical flushing holes 3-3 is sprayed out in a vertically downward direction; multiple horizontal flushing holes 3-4 are spaced horizontally at intervals on the lower side of each side wall of the conical jacket 3-2, with the angle of each horizontal flushing hole 3-4 matching the angle of the side wall of the conical jacket 3-2, so that the water jetting out from the horizontal flushing holes 3-4 is sprayed out in a horizontal direction; the multiple vertical flushing holes 3-3 and the multiple horizontal flushing holes 3-4 are preferably arranged in an alternating manner. In practical applications, the high-pressure water jets from each vertical flushing hole 3-3 cut the adjacent soil in the vertical direction, and the high-pressure water jets from each horizontal flushing hole 3-4 cut the adjacent soil in the horizontal direction to form grooves, thereby making the soil near the equipment loose and allowing it to be continuously lowered until it reaches the upper depth position of each side wall of the set conical outer sleeve 3-2.

[0052] To further increase the efficiency of high-pressure water flow cutting the soil, a steel reinforcement brush 3-5 is also installed on the lower side of each side wall of the conical jacket 3-2. The steel reinforcement brush 3-5 is specifically composed of two rows of steel reinforcement groups. Each row of steel reinforcement groups consists of several short steel bars that are equally spaced from one side of the side wall to the other in the horizontal direction, and are set with one end perpendicular to the side wall of the conical jacket 3-2. Since the side wall of the conical jacket 3-2 is set at an angle, the steel reinforcement brush 3-5 is set at an angle downward. As the equipment is continuously lowered, it is inserted into the soil and loosens the soil.

[0053] Example 2

[0054] See Figures 6-9 The underwater straight pile cleaning and cutting construction method using the underwater sludge cleaning and cutting pile equipment of Example 1 is described in detail below.

[0055] S1, crane vessel 9 and barge 11 carrying underwater dredging and pile cutting equipment enter the site and take up their positions. Crane vessel 9 lifts underwater dredging and pile cutting equipment with vibratory hammer 10 on top, and then lowers it to below the water surface 4, aligns it and fits it into the top side of the straight pile 7 to be cut off.

[0056] S2. Start the vibratory hammer 10 and use the ship's water pump to pump high-pressure water down the water pipes 1-4, so that the underwater mud-clearing and pile-cutting equipment can pass through the existing mud surface 6 and reach the designed pile-cutting elevation position of the mud surface 5 under the vibration action of the vibratory hammer 10 and the soil cutting action of the high-pressure water jet from the mud-clearing mechanism 3.

[0057] S3. Start the ship's hydraulic pump station and pump hydraulic oil synchronously to the two hydraulic shear cylinders 2-1 through two hydraulic oil pipes 1-2 to drive the hydraulic shear equipment to cut off the straight pile 7 to be cut off along the elevation position, and keep the hydraulic shear head 2-2 in the closed state so that the cut-off pile foundation 14 is temporarily stored in the casing 1-1.

[0058] S4. The crane ship 9 lifts the underwater mud-cleaning and pile-cutting equipment. If necessary, it is supplemented by a vibratory hammer 10 and uses the ship's water pump to pump high-pressure water through the upward water jet pipes 1-3. The high-pressure water is sprayed upward to cut the soil into a loose state, and the underwater mud-cleaning and pile-cutting equipment is successfully lifted to the water surface 4 or above.

[0059] S5. The crane vessel 9 rotates its boom to horizontally lift the underwater mud-clearing and pile-cutting equipment to the deck of the barge 11 and slowly lower it vertically. When the bottom of the underwater mud-clearing and pile-cutting equipment is ≤1m from the deck, the hydraulic pump station is started to drive the hydraulic shear head 2-2 of the hydraulic shear equipment to open, so that the cut pile foundation 14 in the casing 1-1 falls onto the deck under the action of gravity.

[0060] S6. Using the cut-off pile 14 as the rotation center, slowly lower the top side of the underwater mud-cleaning and pile-cutting equipment until it is leveled on the wooden blocks 13 on the deck of the barge 11.

[0061] S7. Release the wire rope of the winch 12 on the deck of the barge 11 and tie it tightly to the cut-off pile 14. Then drive the winch 12 to tighten the wire rope to pull the cut-off pile 14 out and detach it from the underwater mud-cleaning and pile-cutting equipment.

[0062] Example 3

[0063] See Figures 10-11 The underwater inclined pile cleaning and cutting construction method using the underwater cleaning and cutting pile equipment of Example 1 is described in detail below.

[0064] S1, the crane vessel 9 and the barge 11 carrying the underwater sludge removal and pile cutting equipment enter the site and take their positions. The crane vessel 9 lifts the underwater sludge removal and pile cutting equipment with a vibratory hammer 10 on top, and at the same time connects it to the top side lifting lug of the casing 1-1 through the lifting rope. By adjusting the length of the lifting rope, the tilt angle of the underwater sludge removal and pile cutting equipment is consistent with the tilt angle of the inclined pile 8 to be cut. Maintaining this lifting angle, the underwater sludge removal and pile cutting equipment is lowered to below the water surface 4, aligned and fitted into the top side of the inclined pile 8 to be cut.

[0065] The remaining steps S2-S7 are consistent with the construction method for cutting straight piles in Example 2.

[0066] It should be noted that the parts of this invention not disclosed in detail belong to the well-known technology in the field; in addition, although the illustrative specific embodiments of this invention have been described above to enable those skilled in the art to understand this invention, it should be understood that this invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of this invention as defined and determined by the appended claims, and all inventions utilizing the concept of this invention are protected.

Claims

1. A method for underwater straight or inclined pile construction involving mud removal and pile cutting, characterized in that, The system includes underwater sludge removal and pile cutting equipment, which consists of a casing assembly, a hydraulic shearing mechanism, and a sludge removal mechanism connected sequentially from top to bottom. The casing assembly includes a casing with a pipeline group installed on it. The hydraulic shearing mechanism includes a hydraulic shear device fixed inside a protective casing. The top and bottom surfaces of the protective casing have through holes that communicate with the shearing through holes of the hydraulic shear device. The casing is coaxially arranged with the through holes on the protective casing and vertically fixed to the top surface of the protective casing. The pipeline group consists of multiple hydraulic oil pipes, at least one upper flushing pipe, and at least one lower flushing pipe. The upper sections of the pipes are arranged vertically side by side on the casing wall. The lower sections of the upper flushing pipes are evenly distributed in a serpentine bend on the top surface of the protective casing, with the other end closed. Several upward-facing nozzles are spaced apart on the lower section. The lower sections of the multiple hydraulic oil pipes connect to the hydraulic shear devices on the hydraulic shear device via the top surface of the protective casing. The hydraulic cylinder oil circuit port is connected; the lower section of the flushing pipe is connected to the inlet of the sludge cleaning mechanism via a protective sleeve; the sludge cleaning mechanism includes a conical sleeve and a conical outer sleeve; the conical sleeve is a cylindrical structure with an inner diameter that gradually increases from top to bottom, and it is located directly below the shearing through hole; the conical outer sleeve is an inverted trapezoidal structure with an inner diameter that gradually decreases from top to bottom, and it is fitted and fixed to the outside of the conical sleeve in a manner that creates an annular cavity with the conical sleeve, and fixed to the bottom side of the protective sleeve; multiple vertical flushing holes with an oblique downward direction are spaced at intervals along the horizontal direction on the upper side of each side wall of the conical outer sleeve, and multiple horizontal flushing holes with an oblique upward direction are spaced at intervals along the horizontal direction on the lower side of each side wall of the conical outer sleeve, so as to spray high-pressure water in the vertical downward direction and the horizontal direction respectively; the inlet is opened on any side wall of the conical outer sleeve; the sludge cleaning and pile cutting construction steps for underwater straight piles or inclined piles are as follows: S1. The crane vessel lifts an underwater dredging and pile cutting device with a vibratory hammer on top and lowers it to fit the straight or inclined pile to be cut. S2. Start the vibratory hammer and pump high-pressure water downward through the water pipe so that the underwater mud-clearing and pile-cutting equipment can pass through the existing mud surface under the cutting action of the vibratory hammer and high-pressure water flow, and reach the designed pile-cutting elevation position of the mud surface. S3. Start the hydraulic pump station and drive the hydraulic shearing equipment to cut off the straight pile to be removed along the elevation position, and keep its hydraulic shear head in the closed state so that the cut pile foundation is temporarily stored in the casing. S4. The crane vessel lifts the underwater mud-clearing and pile-cutting equipment above the water surface, ensuring it is in a vertical position; S5. The crane vessel horizontally transports the underwater mud-clearing and pile-cutting equipment to the top of the barge deck and slowly lowers it vertically to a distance of ≤1m from the bottom of the deck; the hydraulic pump station is started to drive the hydraulic shear head of the hydraulic shear equipment to open, so that the cut pile foundation in the casing falls onto the deck. S6. Using the cut-off pile as the rotation center, slowly lower the underwater mud-cleaning and pile-cutting equipment until it is level. S7. Use a winch wire rope to tightly bind the cut-off pile foundation and pull it out from the underwater mud-cleaning and pile-cutting equipment.

2. The underwater straight or inclined pile cleaning and cutting construction method according to claim 1, characterized in that, The inner diameter of the casing is larger than the outer diameter of the pile foundation; the length of the casing must meet the requirement that the top side of the casing always protrudes above the water surface when the equipment is underwater for sludge removal and pile cutting.

3. The underwater straight or inclined pile cleaning and cutting construction method according to claim 1, characterized in that, Two sleeve lifting lugs are symmetrically arranged on the top side wall of the sleeve.

4. The underwater straight or inclined pile cleaning and cutting construction method according to claim 1, characterized in that, Multiple triangular ribs are evenly distributed in the circumferential direction at the bottom end of the casing, and each triangular rib is fixed to the side wall of the casing and the top surface of the protective casing, respectively.

5. The underwater straight or inclined pile cleaning and cutting construction method according to claim 1, characterized in that, The hydraulic oil pipes, upper flushing water pipes, and lower flushing water pipes installed on the casing wall and protective casing are all fixed by pipe clamps; the pipe clamp is a strip plate with multiple clamping holes on one long side along the horizontal direction, which are adapted to the number and size of the oil pipes and / or water pipes to be fixed.

6. The underwater straight or inclined pile cleaning and cutting construction method according to claim 1, characterized in that, The top inner diameter of the tapered sleeve is the same as the inner diameter of the shearing through hole; the top outer diameter of the tapered outer sleeve is the same as the bottom surface of the protective sleeve box, so as to fix it on the bottom edge of the protective sleeve box.

7. The underwater straight or inclined pile cleaning and cutting construction method according to claim 1, characterized in that, Multiple vertically arranged reinforcing ribs are arranged at intervals along the horizontal and vertical directions inside the conical outer sleeve to form a grid structure in the annular cavity between the conical outer sleeve and the conical tube; each reinforcing rib has at least one connecting hole.

8. The underwater straight or inclined pile cleaning and cutting construction method according to claim 1, characterized in that, A steel reinforcement brush is provided on the lower side of the outer wall of each conical jacket. It consists of multiple rows of steel reinforcement groups. Each row of steel reinforcement groups consists of short steel bars that are equally spaced from one side of the side wall to the other side in the horizontal direction, and one end of each short steel bar is perpendicular to and fixed on the outer wall of the conical jacket.

9. The underwater straight or inclined pile cleaning and cutting construction method according to claim 1, characterized in that, In step S1, for straight piles, the crane vessel lifts an underwater dredging and pile cutting device with a vibratory hammer on top, and then lowers it below the water surface to align and fit the straight pile to be cut. For inclined piles, the crane vessel lifts an underwater dredging and pile cutting device with a vibratory hammer on top, and simultaneously connects it to the casing lifting lug via a lifting rope. By adjusting the length of the lifting rope, the inclination angle of the underwater dredging and pile cutting device is made consistent with the inclination angle of the inclined pile. Then, it is lowered below the water surface to align and fit the inclined pile to be cut.

10. The underwater straight or inclined pile cleaning and cutting construction method according to claim 1, characterized in that, In step S4, when the lifting vessel encounters obstruction while hoisting the underwater mud-clearing and pile-cutting equipment, the vibratory hammer is activated and high-pressure water is pumped upward through the water jet pipe to spray high-pressure water upward through each nozzle.

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