Method for stirring and loosening soil in offshore pile based on high-pressure jet water

Abstract

The invention discloses an offshore in-pile stirring soil loosening method based on high-pressure jet water. The method comprises the steps that the pile stabilizing platform is hoisted to the position near a foundation pile, and the pile stabilizing platform is lowered; the position of the pile stabilizing platform is fixed; the pile casings are lengthened and lowered through a drill tower located on the embracing arm platform, so that the pile casing at the bottommost part extends into the foundation pile; the drill pipe equipment is lifted and lowered through the drill tower, so that the drill pipe equipment extends into the pile casing and is drilled into the designed soil layer depth; the drill pipe equipment is recycled, and the high-pressure jet flow water equipment is lifted and lowered through the drill tower, so that the high-pressure jet flow water equipment extends into the pile casing and is located at the bottom of the hole channel, and surrounding soil is scoured; after soil loosening of the first hole channel is completed, the drill tower is adjusted, and drilling and soil loosening operation is conducted on the remaining hole channels; and after the soil loosening of the first foundation pile is completed, the pile stabilizing platform is hoisted to the position near the next foundation pile to be constructed, and the soil loosening operation of the remaining foundation piles is completed. The method is applied to the technical field of offshore jacket foundation construction.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore jacket foundation construction, and particularly relates to a method for stirring and loosening soil inside an offshore pile based on high-pressure jet water Background Art

[0002] Due to the complex geological conditions of offshore wind power projects, soil plugging is likely to occur during the driving process of foundation piles, resulting in difficulty in driving the piles to the designed elevation. If a large-energy hydraulic hammer is used for pile driving, severe pile jumping is likely to occur, leading to easy damage to the equipment. This not only has low construction efficiency but also poses a relatively high safety risk. Therefore, there are problems of high pile driving difficulty and low construction efficiency during the pile driving process of current jacket foundation piles. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a method for stirring and loosening soil inside an offshore pile based on high-pressure jet water, which has high pile driving efficiency and reduces the pile driving difficulty.

[0004] The technical solution adopted by the present invention is as follows: The method for stirring and loosening soil inside an offshore pile includes the following steps:

[0005] Step S1: Lift and install the pile stabilizing platform near the foundation pile, and lower the pile stabilizing platform when the clamping arm platform of the pile stabilizing platform is above the foundation pile to be constructed;

[0006] Step S2: Fix the position of the pile stabilizing platform;

[0007] Step S3: Extend and lower multiple casing pipes through the drill tower located on the clamping arm platform, so that the lowermost casing pipe extends into the foundation pile;

[0008] Step S4: Lift and lower the drill pipe equipment through the drill tower, so that the drill pipe equipment extends into the casing pipe and drills into the designed soil layer depth;

[0009] Step S5: Recover the drill pipe equipment, lift and lower the high-pressure jet water equipment through the drill tower, so that the high-pressure jet water equipment extends into the casing pipe and is located at the bottom of the hole, and scour the surrounding soil;

[0010] Step S6: After the first hole is loosened, adjust the drill tower, and perform drilling and loosening operations on the remaining holes along the circumferential direction inside the foundation pile;

[0011] Step S7: After the first foundation pile is loosened, lift and install the pile stabilizing platform near the next foundation pile to be constructed, and complete the soil loosening operation of the remaining foundation piles in the same manner.

[0012] Further, in step S1, it includes the following steps:

[0013] Step S101: Use a crane barge to lift and tow the pile stabilizing platform to the vicinity of the foundation pile, and then drop the anchor for positioning.

[0014] Step S102: Move the drill pipe equipment, high-pressure water jet equipment, and casing to the deck of the crane barge and conduct commissioning runs.

[0015] Step S103: Slowly adjust the position of the pile stabilizing platform by adjusting the boom of the crane barge and moving the barge by winching the anchor, and then lower the pile stabilizing platform to the mud surface.

[0016] Step S104: Use positioning equipment to accurately locate the center position of the foundation pile to be constructed.

[0017] Step S105: Control the orientation of the pile stabilizing platform by pulling the guy ropes, slowly approach the foundation pile from the downstream direction of the water flow, and slowly lower the pile stabilizing platform when the center coordinates of the arm platform and the foundation pile are within the required range.

[0018] Further, in Step S2, it includes the following steps:

[0019] Step S201: Use a crane barge to lift the vibratory hammer and clamp the auxiliary piles of the pile stabilizing platform.

[0020] Step S202: Release the connection between the auxiliary piles and the pile stabilizing platform, let the auxiliary piles sink naturally, and then conduct vibratory pile driving using the vibratory hammer.

[0021] Step S203: After all the auxiliary piles are driven to the required depth, fix the pile stabilizing platform and weld connecting plates between the pile stabilizing platform and the auxiliary piles.

[0022] Further, in Step S3, it includes the following steps:

[0023] Step S301: Weld a rotating platform on the arm platform and assemble a drill tower on the rotating platform.

[0024] Step S302: Lift and install the drill pipe equipment, high-pressure water jet equipment, and casing onto the pile stabilizing platform.

[0025] Step S303: Connect the wire rope of the drill tower to the first section of the casing and lower the first section of the casing so that the top of the first section of the casing is fixed on the arm platform.

[0026] Step S304: Use the drill tower to lift the second section of the casing and connect the second section of the casing to the first section of the casing.

[0027] Step S305: Release the fixation between the first section of the casing and the arm platform and continue to lower the second section of the casing.

[0028] Step S306: In subsequent cycles, lower the casing while connecting the long sides, so that the bottommost casing extends into the foundation pile and stably touches the mud.

[0029] Step S307: Continue to connect and lengthen the casing and slowly lower it until the height of the topmost casing matches the arm platform.

[0030] Furthermore, in step S4, it includes the following steps:

[0031] Step S401: Lift and lower the drill pipe equipment by the drill tower; among them, lower the drill pipe equipment continuously in the way of connecting and lengthening the drill pipe of the drill pipe equipment while lowering.

[0032] Step S402: With the assistance of the operator on the arm platform, make the drill pipe equipment extend into the casing.

[0033] Step S403: After the bit of the drill pipe equipment touches the mud, start drilling.

[0034] Step S404: Observe the height of the drill pipe of the drill pipe equipment, and keep the height of the drill pipe higher than the top of the casing in the way of connecting and lengthening while lowering, and so on in cycles until the bit drills to the designed soil layer depth.

[0035] Furthermore, in step S5, it includes the following steps:

[0036] Step S501: After completing the drilling, lift the drill pipe equipment by the drill tower and disassemble the drill pipe equipment section by section and place it on the pile stabilizing platform.

[0037] Step S502: Lift the high-pressure jet water equipment by the drill tower and lower the high-pressure water pipe line of the high-pressure jet water equipment.

[0038] Step S503: With the assistance of the operator on the arm platform, make the high-pressure jet water equipment enter the casing and reach the bottom of the hole.

[0039] Step S504: Wash the surrounding soil from bottom to top at the bottom of the hole by the high-pressure jet water equipment.

[0040] Step S505: After the soil in the hole is loosened, recover the high-pressure jet water equipment and the casing.

[0041] Furthermore, in step S7, it includes the following steps:

[0042] Step S701: After the first foundation pile is loosened, lift the pile stabilizing platform to the next foundation pile to be constructed by the crane ship, and drill and loosen the remaining foundation piles in the same way.

[0043] Furthermore, the arm platform includes an upper arm platform and a lower arm platform. Both the upper arm platform and the lower arm platform are installed on the pile stabilizing platform and extend out of the side end of the pile stabilizing platform. The upper arm platform is located above the lower arm platform.

[0044] Furthermore, the drill pipe device includes a drill bit and a plurality of drill pipes. The plurality of drill pipes can be lengthened as required, and the drill bit is arranged at the bottom of the drill pipe.

[0045] Furthermore, the high-pressure water jet device includes a high-pressure water pipe line and a plurality of high-pressure water jet nozzles. The plurality of high-pressure water jet nozzles are installed at the bottom of the high-pressure water pipe line.

[0046] The beneficial effects of the present invention are as follows:

[0047] Compared with the deficiencies of the prior art, in the present invention, by lifting and lengthening and lowering a plurality of casing pipes, the lowermost casing pipe is inserted into the foundation pile. Further, the drill pipe device is lifted into the casing pipe. After touching the mud, the drill pipe device is started until the designed depth is drilled. Further, the high-pressure water jet device is lifted into the casing pipe. The high-pressure water jet liquefies the soil around the hole drilled by the drill pipe device to reduce the soil plug effect and the skin friction in the pile, greatly improving the pile driving efficiency. Therefore, the present invention flushes the surrounding soil in the foundation pile through the high-pressure water jet to reduce the soil plug effect, which can effectively reduce the pile driving difficulty and improve the pile driving efficiency of the foundation pile, making the present invention have the advantages of high pile driving efficiency and reduced pile driving difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0049] Figure 1 is the flow schematic diagram of the present invention;

[0050] Figure 2 is the plan view of the present invention when the crane ship anchors in place;

[0051] Figure 3 is the plan view of the pile stabilizing platform of the present invention during installation;

[0052] Figure 4 is the plan view of the pile stabilizing platform of the present invention;

[0053] Figure 5 is the plan view of the casing pipe of the present invention during hoisting and installation;

[0054] Figure 6 is the schematic plan view of the drill pipe equipment of the present invention during hoisting;

[0055] Figure 7 is the schematic plan view of the drill pipe equipment of the present invention during drilling;

[0056] Figure 8 is the schematic plan view of the high-pressure water jet equipment of the present invention during hoisting;

[0057] Figure 9 is the schematic diagram of the drilling trajectory of the drill pipe equipment of the present invention;

[0058] Figure 10 is the schematic plan view of the drill pipe equipment of the present invention;

[0059] Figure 11 is the schematic plan view of the high-pressure water jet equipment of the present invention.

[0060] The reference numerals are as follows:

[0061] 1, stable pile platform; 2, foundation pile; 3, arm-holding platform; 5, crane ship; 6, drill tower; 7, casing; 8, drill pipe equipment; 9, high-pressure water jet equipment; 10, upper arm-holding platform; 11, lower arm-holding platform; 12, drill bit; 13, drill pipe; 15, high-pressure water pipe line; 16, high-pressure water jet nozzle.

[0062] The realization of the purpose, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed Embodiments

[0063] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0064] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, clockwise, counterclockwise, etc., are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0065] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0066] As Figures 1 to 11 shown, in this embodiment, the method for stirring and loosening soil inside an offshore pile based on high-pressure jet water includes the following steps:

[0067] Step S1: Lift and install the pile stabilizing platform 1 near the foundation pile 2, and lower the pile stabilizing platform 1 when the arm platform 3 of the pile stabilizing platform 1 is above the foundation pile 2 to be constructed;

[0068] Step S2: Fix the position of the pile stabilizing platform 1;

[0069] Specifically, lift the pile stabilizing platform 1 by a crane ship 5 and tow it near the construction site, drop the anchor in place, lift the pile stabilizing platform 1 and move the ship by winching the anchor to near the center of the construction site. Slowly adjust the position of the pile stabilizing platform 1 by adjusting the boom of the crane ship 5 and moving the ship by winching the anchor, and then lower the pile stabilizing platform 1 to the mud surface. Surveyors go onto the pile stabilizing platform 1 and use RTK precise positioning equipment to measure the pile center position of the foundation pile 2. When the center coordinates of the arm center of the pile stabilizing platform 1 and the foundation pile 2 are within the required range, after positioning, vibrate and fix the auxiliary piles of the pile stabilizing platform 1.

[0070] Step S3: Extend and lower multiple casing pipes 7 through the drill tower 6 located on the arm platform 3 so that the lowermost casing pipe 7 extends into the foundation pile 2;

[0071] Specifically, use the drill tower 6 to hang a steel wire rope to the casing pipe 7 and lift it. First, lift the first section of the casing pipe 7 and slowly lower the steel wire rope to fix the first section of the casing pipe 7 on the arm platform 3 of the pile stabilizing platform 1. Then, lift the second section of the casing pipe 7 by the drill tower 6 and connect it with the first section of the casing pipe 7, and then slowly lower the steel wire rope. Repeat this process to connect the casing pipes 7 so that the lowermost casing pipe 7 gradually enters the foundation pile 2 to touch the mud until the height of the uppermost casing pipe 7 is close to the arm platform 3 of the pile stabilizing platform 1.

[0072] Step S4: Lift and lower the drill pipe equipment 8 by the drill tower 6 so that the drill pipe equipment 8 extends into the casing pipe 7 and drills into the designed soil layer depth;

[0073] Step S5: Recover the drill pipe equipment 8, lift the high-pressure jet water equipment 9 by the drill tower 6 and lower it, so that the high-pressure jet water equipment 9 extends into the casing 7 and is located at the bottom of the hole, and scour the surrounding soil;

[0074] Specifically, lift the drill pipe equipment 8 into the casing 7 by the drill tower 6. During the process, connect and lower the drill pipe equipment 8 in the same way. After touching the mud, start the drill pipe equipment 8 until the drill pipe equipment 8 drills to the designed depth. During the process, attention should be paid to the extended length of the drill pipe equipment 8. Further, lift the high-pressure jet water equipment 9 into the casing 7 by the drill tower 6, and scour the surrounding soil in the foundation pile 2 from bottom to top through the high-pressure jet water equipment 9.

[0075] Step S6: After the first hole is loosened, adjust the drill tower 6, and perform the drilling and loosening operation on the remaining holes along the circumferential direction inside the foundation pile 2;

[0076] Step S7: After the first foundation pile 2 is loosened, hoist the pile stabilizing platform 1 to the vicinity of the next foundation pile 2 to be constructed, and perform the loosening operation on the remaining foundation piles 2 in the same way.

[0077] Specifically, after the soil around the drilled hole is loosened, adjust the drill tower 6, and drill the next hole in the same way. Drill and loosen about 15 holes along the circumferential direction close to the inside of the foundation pile 2, so that the soil inside the foundation pile 2 is in a liquefied state; after the first foundation pile 2 is loosened, adjust the position of the pile stabilizing platform 1 through the boom of the crane ship 5 to loosen the soil of the remaining foundation piles 2.

[0078] Compared with the deficiencies of the prior art, in the present invention, by hoisting and connecting multiple casings 7 and lowering them, the lowermost casing 7 extends into the foundation pile 2. Further, hoist the drill pipe equipment 8 into the casing 7. After touching the mud, start the drill pipe equipment 8 until it drills to the designed depth. Further, hoist the high-pressure jet water equipment 9 into the casing 7, and liquefy the surrounding soil of the hole drilled through the drill pipe equipment 8 through the high-pressure jet water to reduce the soil plug effect and the frictional resistance in the pile, greatly improving the pile driving efficiency. Therefore, in the present invention, the surrounding soil in the foundation pile 2 is dispersed by the high-pressure jet water to reduce the soil plug effect, which can effectively reduce the pile driving difficulty and improve the pile driving efficiency of the foundation pile 2, making the present invention have the advantages of high pile driving efficiency and reduced pile driving difficulty.

[0079] As Figures 2 to 4 shown, in some embodiments, in step S1, it includes the following steps:

[0080] Step S101: Hoist the pile stabilizing platform 1 by the crane ship 5, tow it to the vicinity of the foundation pile 2, and perform anchor positioning;

[0081] Specifically, the crane vessel 5 is anchored and positioned according to the pre-designed anchor positions, and the actual anchoring is adjusted according to the on-site wind speed and waves.

[0082] Step S102: Move the drill pipe equipment 8, the high-pressure water jet equipment 9, and the casing 7 to the deck of the crane vessel 5 and conduct commissioning runs.

[0083] Step S103: Slowly adjust the position of the pile stabilizing platform 1 by adjusting the boom of the crane vessel 5 and moving the ship by winching the anchor, and then lower the pile stabilizing platform 1 to the mud surface.

[0084] Step S104: Accurately position the center position of the foundation pile 2 to be constructed through the positioning equipment.

[0085] Specifically, the operator goes to the pile stabilizing platform 1 and uses the RTK precise positioning equipment to measure the center position of the foundation pile 2.

[0086] Step S105: Control the orientation of the pile stabilizing platform 1 by pulling the guy ropes, slowly approach the foundation pile 2 from the downstream direction of the water flow, and slowly lower the pile stabilizing platform 1 when the center coordinates of the holding arm platform 3 and the center of the foundation pile 2 are within the required range.

[0087] In some embodiments, in step S2, it includes the following steps:

[0088] Step S201: Lift the vibratory hammer by the crane vessel 5 and clamp the auxiliary piles of the pile stabilizing platform 1.

[0089] Step S202: Release the connection between the auxiliary piles and the pile stabilizing platform 1, allow the auxiliary piles to sink naturally, and then conduct vibratory pile driving through the vibratory hammer.

[0090] Step S203: After all the auxiliary piles are driven to the required position, fix the pile stabilizing platform 1 and weld the connecting plates between the pile stabilizing platform 1 and the auxiliary piles.

[0091] Specifically, lift the vibratory hammer by the auxiliary hook of the crane vessel 5, lift the hydraulic oil pipe by the sling hook, rotate the boom to the top of the auxiliary pile and clamp the auxiliary pile with the fixture, then release the lock between the auxiliary pile and the pile stabilizing platform 1, allow the auxiliary pile to sink naturally and then conduct vibratory pile driving; when all the auxiliary piles of the pile stabilizing platform 1 are driven to the required position, start to fix the pile stabilizing platform 1 and weld the connecting plates between the pile stabilizing platform 1 and the auxiliary piles.

[0092] As Figure 5 shown, in some embodiments, in step S3, it includes the following steps:

[0093] Step S301: Weld the rotating platform on the holding arm platform 3 and assemble the drill tower 6 on the rotating platform; among them, the drill tower 6 is a four-corner drill tower.

[0094] Specifically, a crawler crane is used to lift steel pipes and assemble the drill tower 6 on the boom platform 3. A rotating platform is welded and fixed in advance at the bottom of the drill tower 6 so that the drill tower 6 can adjust its position and direction. The equipment, pipelines, etc. are lifted onto the pile stabilizing platform 1 and the high-pressure water pipe pipeline 15 is pre-laid.

[0095] Step S302: Lift the drill pipe equipment 8, the high-pressure jet water equipment 9 and the casing 7 onto the pile stabilizing platform 1.

[0096] Step S303: Connect the wire rope of the drill tower 6 to the first section of the casing 7 and lower the first section of the casing 7 so that the top of the first section of the casing 7 is fixed on the boom platform 3.

[0097] Step S304: Lift the second section of the casing 7 by the drill tower 6 and connect the second section of the casing 7 to the first section of the casing 7.

[0098] Step S305: Release the fixation between the first section of the casing 7 and the boom platform 3 and continue to lower the second section of the casing 7.

[0099] Step S306: In subsequent cycles, lower the casing 7 while connecting it section by section so that the bottommost casing 7 extends into the foundation pile 2 and stably touches the mud.

[0100] Specifically, a wire rope is led out from the top pulley of the drill tower 6 and hung to the first section of the casing 7. Workers assist in adjusting the position, and then the drill tower 6 slowly lowers the wire rope so that the top of the first section of the casing 7 is fixed at the boom platform 3. Further, the drill tower 6 lifts the second section of the casing 7 and connects it to the first section of the casing 7, releases the fixation between the first section of the casing 7 and the boom platform 3, and then slowly lowers the wire rope. In this way, the casing 7 is lowered while connecting it section by section. When the casing 7 is close to the foundation pile 2, divers assist in observing the alignment situation.

[0101] Step S307: Continue to lengthen the casing 7 and slowly lower it until the height of the topmost casing 7 is adapted to the boom platform 3.

[0102] Specifically, after the casing 7 enters the foundation pile 2 and touches the mud and stabilizes, continue to lengthen the casing 7 and slowly lower it until the height of the topmost casing 7 is adapted to the boom platform 3.

[0103] Such as Figure 6 and Figure 7 shown, in some embodiments, in step S4, it includes the following steps:

[0104] Step S401: Lift the drill pipe equipment 8 by the drill tower 6 and lower it; among them, the drill pipe equipment 8 is continuously lowered in the way of lengthening the drill pipe 13 of the drill pipe equipment 8 while lowering.

[0105] Step S402: With the assistance of the operator located on the boom platform 3, make the drill pipe equipment 8 extend into the casing 7.

[0106] Specifically, after the casing 7 is hoisted in place, the drill pipe equipment 8 is hoisted by the drill tower 6. The wire rope is slowly lowered, and workers on the platform assist to guide the drill pipe equipment 8 into the casing 7. The drill pipe equipment 8 is connected and lowered in the same manner.

[0107] Step S403: After the drill bit 12 of the drill pipe equipment 8 touches the mud, drilling begins.

[0108] Step S404: Observe the height of the drill pipe 13 of the drill pipe equipment 8, and maintain the height of the drill pipe 13 above the top of the casing 7 by connecting and lowering it in sections. Repeat this process until the drill bit 12 drills to the designed soil layer depth.

[0109] Specifically, after the drill pipe equipment 8 touches the mud, drilling begins. During the drilling process, the height of the drill pipe 13 is observed simultaneously. The drill pipe 13 is extended by the drill tower 6, and the operator assists in docking on the pile stabilizing platform 1 to keep the drill pipe 13 higher than the top of the casing 7. Repeat this process until the designed soil layer depth is drilled.

[0110] As Figure 8 shown, in some embodiments, in step S5, it includes the following steps:

[0111] Step S501: After the drilling is completed, hoist the drill pipe equipment 8 by the drill tower 6, and disassemble the drill pipe equipment 8 section by section and place it on the pile stabilizing platform 1.

[0112] Step S502: Hoist the high-pressure jet water equipment 9 by the drill tower 6, and lower the high-pressure water pipe line 15 of the high-pressure jet water equipment 9.

[0113] Step S503: With the assistance of the operator on the arm platform 3, guide the high-pressure jet water equipment 9 into the casing 7 and reach the bottom of the hole.

[0114] Step S504: Use the high-pressure jet water equipment 9 to scour the surrounding soil from the bottom up at the bottom of the hole.

[0115] Step S505: After the soil in the hole is loosened, recover the high-pressure jet water equipment 9 and the casing 7.

[0116] It should be noted that, as Figure 9 shown, the diameter of the foundation pile 2 is 3.5 m. After the first hole is completed, adjust the position of the four-corner drill tower 6 by the crawler crane, and drill and loosen the remaining holes (there are about 15 evenly distributed holes) along the trajectory line with a diameter of about 3 m inside the foundation pile 2.

[0117] In some embodiments, in step S7, it includes the following steps:

[0118] Step S701: After the first foundation pile 2 is loosened, the pile stabilizing platform 1 is lifted by a crane ship 5 to the next foundation pile 2 to be constructed, and the remaining foundation piles 2 are drilled and loosened in the same manner.

[0119] As Figures 5 to 8 shown, in some embodiments, the arm platform 3 includes an upper arm platform 10 and a lower arm platform 11. Both the upper arm platform 10 and the lower arm platform 11 are installed on the pile stabilizing platform 1 and extend out of the side end of the pile stabilizing platform 1. The upper arm platform 10 is located above the lower arm platform 11.

[0120] As Figure 10 shown, in some embodiments, the drill pipe device 8 includes a drill bit 12 and a plurality of drill pipes 13. The plurality of drill pipes 13 can be lengthened as needed, and the drill bit 12 is arranged at the bottom of the drill pipes 13. Specifically, by lengthening the drill pipes 13 as needed, it is convenient for the drill bit 12 to drill into the soil layer.

[0121] As Figure 11 shown, in some embodiments, the high-pressure jet water device 9 includes a high-pressure water pipe pipeline 15 and a plurality of high-pressure jet water nozzles 16. The plurality of high-pressure jet water nozzles 16 are installed at the bottom of the high-pressure water pipe pipeline 15. Specifically, through the arrangement of the plurality of high-pressure jet water nozzles 16 at the bottom of the high-pressure water pipe pipeline 15, the soil layer is loosened and liquefied to reduce the inner frictional resistance of the foundation pile 2.

[0122] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A method for stirring and loosening soil inside an offshore pile based on high-pressure jet water, characterized in that: It includes the following steps: Step S1: Lift and install the pile stabilizing platform near the foundation pile. When the clamping arm platform of the pile stabilizing platform is above the foundation pile to be constructed, lower the pile stabilizing platform. Step S2: Fix the position of the pile stabilizing platform. Step S3: Through the drill tower located on the clamping arm platform, lengthen and lower multiple casing pipes so that the bottommost casing pipe extends into the foundation pile. Step S4: Lift and lower the drill pipe equipment through the drill tower so that the drill pipe equipment extends into the casing pipe and drills into the designed soil layer depth. Step S5: Recover the drill pipe equipment. Lift and lower the high-pressure jet water equipment through the drill tower so that the high-pressure jet water equipment extends into the casing pipe and is located at the bottom of the hole, and scour the surrounding soil. Step S6: After the first hole is loosened, adjust the drill tower and perform the operation of drilling and loosening the remaining holes along the circumferential direction inside the foundation pile. Step S7: After the first foundation pile is loosened, lift and install the pile stabilizing platform near the next foundation pile to be constructed, and complete the loosening operation of the remaining foundation piles in the same way.

2. The method for stirring and loosening soil inside a marine pile based on high-pressure jet water according to claim 1, wherein: In step S1, it includes the following steps: Step S101: Lift the pile stabilizing platform by a crane ship, tow it to near the foundation pile, and drop the anchor for positioning. Step S102: Move the drill pipe equipment, high-pressure jet water equipment and casing pipes to the deck of the crane ship and perform commissioning runs. Step S103: Slowly adjust the position of the pile stabilizing platform by adjusting the boom of the crane ship and winching the anchor to move the ship, and then lower the pile stabilizing platform to the mud surface. Step S104: Accurately position the center position of the foundation pile to be constructed through the positioning equipment. Step S105: Control the orientation of the pile stabilizing platform by pulling the guy ropes, slowly approach the foundation pile from the downstream direction of the water flow. When the center coordinates of the clamping arm platform and the foundation pile are within the required range, slowly lower the pile stabilizing platform.

3. A method for stirring and loosening soil inside an offshore pile based on high-pressure jet water according to claim 1, characterized in that: In step S2, it includes the following steps: Step S201: Lift the vibrating hammer by a crane ship and clamp the auxiliary piles of the pile stabilizing platform. Step S202: Disconnect the connection between the auxiliary piles and the pile stabilizing platform, let the auxiliary piles sink naturally, and then perform vibrating pile driving through the vibrating hammer. Step S203: After all the auxiliary piles are driven to the required position, fix the pile stabilizing platform and weld the connecting plates between the pile stabilizing platform and the auxiliary piles.

4. A method for stirring and loosening soil inside an offshore pile based on high-pressure jet water according to claim 1, characterized in that: In step S3, it includes the following steps: Step S301: Weld a rotating platform on the clamping arm platform and assemble a drill tower on the rotating platform. Step S302: Lift and install the drill pipe equipment, high-pressure jet water equipment and casing pipes onto the pile stabilizing platform. Step S303: Connect the steel wire rope of the drill tower to the first section of the casing pipe and lower the first section of the casing pipe so that the top of the first section of the casing pipe is fixed on the clamping arm platform. Step S304: Lift the second section of the casing pipe by the drill tower and connect the second section of the casing pipe to the first section of the casing pipe. Step S305: Release the fixation between the first section of the casing pipe and the clamping arm platform and continue to lower the second section of the casing pipe. Step S306: In subsequent cycles, lengthen and lower the casing pipes so that the bottommost casing pipe extends into the foundation pile and stably touches the mud. Step S307: Continue to lengthen and slowly lower the casing pipes until the height of the topmost casing pipe is adapted to the clamping arm platform.

5. A method for stirring and loosening soil inside a marine pile based on high-pressure jet water according to claim 1, characterized in that: In step S4, it includes the following steps: Step S401: Lift and lower the drill pipe equipment by the derrick; among them, the drill pipe equipment is continuously lowered in the way of connecting the drill pipes of the drill pipe equipment and lowering at the same time. Step S402: With the assistance of the operator on the arm platform, extend the drill pipe equipment into the casing. Step S403: Start drilling after the drill bit of the drill pipe equipment touches the mud. Step S404: Observe the height of the drill pipe of the drill pipe equipment, and keep the height of the drill pipe higher than the top of the casing in the way of connecting and lowering at the same time, and repeat this cycle until the drill bit drills into the designed soil layer depth.

6. A method for stirring and loosening soil inside an offshore pile based on high-pressure jet water according to claim 1, characterized in that: In step S5, it includes the following steps: Step S501: After the drilling is completed, lift the drill pipe equipment by the derrick, and disassemble the drill pipe equipment section by section and place it on the pile stabilizing platform. Step S502: Lift the high-pressure water jet equipment by the derrick, and lower the high-pressure water pipe line of the high-pressure water jet equipment. Step S503: With the assistance of the operator on the arm platform, make the high-pressure water jet equipment enter the casing and reach the bottom of the hole. Step S504: Flush the surrounding soil from bottom to top at the bottom of the hole by the high-pressure water jet equipment. Step S505: After the soil loosening in the hole is completed, recover the high-pressure water jet equipment and the casing.

7. A method for stirring and loosening soil inside an offshore pile based on high-pressure jet water according to claim 1, characterized in that: In step S7, it includes the following steps: Step S701: After the soil loosening of the first foundation pile is completed, lift the pile stabilizing platform to the next foundation pile to be constructed by the crane ship, and drill and loosen the remaining foundation piles in the same way.

8. A method for stirring and loosening soil inside an offshore pile based on high-pressure jet water according to any one of claims 1-7, characterized in that: The arm platform includes an upper arm platform and a lower arm platform. Both the upper arm platform and the lower arm platform are installed on the pile stabilizing platform and both extend out of the side end of the pile stabilizing platform. The upper arm platform is located above the lower arm platform.

9. A method for stirring and loosening soil inside an offshore pile based on high-pressure jet water according to any one of claims 1-7, characterized in that: The drill pipe equipment includes a drill bit and a plurality of drill pipes. The plurality of drill pipes can be connected as needed, and the drill bit is arranged at the bottom of the drill pipe.

10. A method for stirring and loosening soil inside a marine pile based on high-pressure jet water according to any one of claims 1 to 7, characterized in that: The high-pressure water jet equipment includes a high-pressure water pipe line and a plurality of high-pressure water jet nozzles. The plurality of high-pressure water jet nozzles are installed at the bottom of the high-pressure water pipe line.

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