Pile leg pitching folding method

Abstract

The invention provides a pile leg pitching folding method. The pile leg pitching folding method comprises the following steps that pile leg segmentation and pile shoe construction are carried out; a pile leg section and a pile shoe are built respectively, and the tolerance directions of the pile leg section and the pile shoe are the same and are controlled within a preset tolerance range; assigning a reference cross curve of a pile leg insertion position on the pile shoe; the trunk sections are closed, and the horizontal projection of the trunk deck datum line and the horizontal projection of the datum cross curve on the pile shoe coincide; the lower pile fixing frame is closed, and the rack datum line of the lower pile fixing frame coincides with the horizontal projection of the trunk deck datum line and the horizontal projection of the datum cross curve; closing the upper pile fixing frame; adjusting the tooth tip of the gear box to face downwards; hoisting the pile leg sections and closing the inserted piles; overturning the pile leg sections to enable the pile leg sections to extend in the vertical direction; a pile leg section is lowered, and a rack plate is inserted between left and right gearbox gears of an upper pile fixing frame; driving the pile leg subsections to move downwards through the gear of the gear box until the bottoms of the pile leg subsections move downwards to preset mounting positions in the pile shoe; and the pile leg sections and the pile shoe are welded.

Description

Technical Field

[0001] The invention relates to the technical field of marine engineering, and in particular to a pile leg plugging and closing method. Background Art

[0002] The lifting system of conventional jack-up drilling platforms or wind turbine installation vessels is often a difficult point in construction. Due to its large workload and high difficulty, it is also a key factor affecting the launch of the project. Among them, the pile legs and pile shoes are important components of the lifting system. The blind tooth docking process between the pile legs and pile shoes has the characteristics of large construction workload, high construction difficulty, and long operation cycle, resulting in a long cycle for the entire project. Summary of the invention

[0003] The purpose of the present invention is to provide a pile leg plugging and closing method to solve the problem of long project cycle in the prior art.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: a pile leg plugging and closing method, comprising the following steps:

[0005] Construction of pile leg sections and pile shoes;

[0006] The pile leg segments and the pile shoes are constructed separately so that the tolerance directions of the two are in the same direction and are both controlled within a preset tolerance range; a reference cross line of the pile leg insertion position is marked on the pile shoes;

[0007] Closing the well enclosure sections so that the well enclosure deck reference line coincides with the horizontal projection of the reference cross line on the pile shoe;

[0008] Closing the lower pile fixing frame so that the rack reference line of the lower pile fixing frame coincides with the horizontal projection of the well enclosure deck reference line and the reference cross line;

[0009] Closing the upper pile fixing frame, so that the rack center reference line of the upper pile fixing frame coincides with the rack reference line of the lower pile fixing frame, the enclosure deck reference line and the horizontal projection of the reference cross line;

[0010] Adjust the gear box's tooth tip to face downward;

[0011] The lifting of pile legs in sections and the closing of pile insertion;

[0012] Flipping the pile leg segments so that they extend vertically;

[0013] Lower the pile leg segments so that the rack plate is inserted between the left and right gearbox gears of the upper pile fixing frame;

[0014] The pile leg segments are moved downward by driving the gears of the gear box until the bottom of the pile leg segments moves downward to a preset installation position in the pile shoe;

[0015] welding;

[0016] The pile leg segments and the pile shoes are welded.

[0017] In one embodiment, the pile shoe includes a bottom plate and three positioning plates spaced apart on the bottom plate, the positioning plates correspond to the three main legs of the pile leg one by one, and the position accuracy tolerance of the three positioning plates is in the same direction as the position accuracy tolerance of the three main legs, and is less than or equal to 3 mm;

[0018] The pile shoe includes a top plate spaced apart above the bottom plate, a pontoon plate spaced apart above the top plate, and a vertical plate extending vertically and extending upward beyond the pontoon plate, and the position accuracy deviation of the vertical plate is less than or equal to 3 mm.

[0019] In one embodiment, the reference crosshairs on the pile shoe are drawn on the top plate;

[0020] The pile shoe includes an internal reinforcement plate arranged in the space between the top plate and the bottom plate and a pontoon reinforcement plate arranged in the space between the top plate and the bottom plate. There is a gap of 2 to 3 mm between the top plate, the pontoon plate, the vertical plate, the internal reinforcement plate and the pontoon reinforcement plate and the main leg of the pile leg.

[0021] In one embodiment, when constructing the pile leg segment, the position accuracy deviation between the three main legs of the pile leg segment is less than or equal to 3 mm;

[0022] The torsion of any main leg of the pile leg segment is less than or equal to 0.00025 RAD;

[0023] The triangle deformation tolerance of the pile leg segment is ±0.07°;

[0024] The rack torsion tolerance of the pile leg segment is ±0.25°.

[0025] In one embodiment, when closing the upper pile fixing frame, the position accuracy deviation of the three upper pile fixing frames is ensured to be less than or equal to 3 mm;

[0026] When the upper pile fixing frames are closed, the triangular deformation tolerance of the three upper pile fixing frames is guaranteed to be ±0.07°.

[0027] In one embodiment, in the step of adjusting the tooth tip of the gear box to face downward, the angle between the tooth tip with the smallest angle with the horizontal plane and facing downward and the horizontal plane is 15° to 35°;

[0028] After the step of adjusting the tooth tip of the gear box to face downward, the method further includes installing wear-resistant plates on the upper pile fixing frame and the lower pile fixing frame.

[0029] In one embodiment, in the step of lowering the pile leg segment so that the rack plate is inserted between the left and right gear box gears of the upper pile fixing frame: the turned-over pile leg segment is lifted above the upper fixing frame, the installation direction of the pile leg segment is adjusted, and the pile leg segment is lowered so that the main leg of the pile leg segment is slowly inserted between the wear-resistant plates on both sides of the upper pile fixing frame.

[0030] In one embodiment, in the step of moving the pile leg segment downward by driving the gear of the gear box, the pile leg segment is sequentially inserted into the pontoon top plate of the pile shoe, the internal structure of the pontoon, the pile shoe top plate and the internal reinforcement structure of the pile leg until the main leg of the pile leg segment falls onto the positioning plate of the pile shoe;

[0031] The downward movement process of the pile leg segments is monitored to eliminate interfering structures.

[0032] In one embodiment, in the step of welding the pile leg segment and the pile shoe, symmetrical welding is performed using an even number of welding positions;

[0033] In the step of welding the pile leg segments and the pile shoe, vertical welding is first performed and then horizontal welding is performed; when welding vertically, welding is performed in reverse order of upward segments;

[0034] Preheating is also performed before welding.

[0035] In one embodiment, before welding the pile leg segment and the pile shoe, the alignment of the weld position is checked and polished after it is confirmed.

[0036] After welding is completed, the weld position is heat treated and inspected for flaws. After passing the inspection, the weld position is tested for tightness and painted.

[0037] It can be seen from the above technical solution that the present invention has at least the following advantages and positive effects:

[0038] The pile leg plugging and closing method of the present invention first constructs the pile leg segments and pile shoes separately and ensures the accuracy of the two, then closes the enclosure, the upper pile frame and the lower pile frame, and then relies on the gear box to lift and close the pile leg segments in an inserted manner, which solves the problem of bulk blind teeth in the pile shoe, greatly reduces the construction workload and construction difficulty, shortens the construction period and reduces the construction cost, and improves the construction environment. Furthermore, the pile leg closing method of inserting the pile shoe as a whole avoids the pile leg rack plate docking and half-side pipe process at the upper position of the top plate of the pile shoe, and at the same time avoids the increase in the height of the main hull due to the need to increase the fracture to meet the specification requirements. Through precision control, the integrity of the vertical plate is guaranteed, and the cutting fracture of the vertical plate is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1It is a schematic flow chart of the pile leg insertion and closing method in the present invention.

[0040] Figure 2 It is a top view of the arrangement of pile legs on the platform in the present invention.

[0041] Figure 3 It is a structural schematic diagram of the pile leg segmentation in the present invention.

[0042] Figure 4 It is a schematic diagram of the position accuracy deviation between the three main legs of the pile leg segment in the present invention.

[0043] Figure 5 It is a schematic diagram of the torsional tolerance of the pile leg segments in the present invention.

[0044] Figure 6 It is a schematic diagram of the triangular deformation tolerance of the pile leg segment in the present invention.

[0045] Figure 7 It is a top view schematic diagram of the bottom plate and the positioning plate of the pile shoe in the present invention.

[0046] Figure 8 It is a structural schematic diagram of the pile shoe in the present invention.

[0047] Fig. 9 It is a schematic diagram of the structure of the pile shoe after the top plate is removed in the present invention.

[0048] Fig.10 It is a survey and marking layout diagram of the pile leg segmented pile insertion and closing benchmark on the pile shoe in the present invention.

[0049] Fig.11 It is a cross-sectional schematic diagram of the pile leg segments and pile shoes in the present invention.

[0050] Fig.12 It is a side view schematic diagram of the pile legs being hoisted up and turned over 90 degrees in sections in the present invention.

[0051] Fig.13 It is a schematic diagram of the arrangement of the pile legs before they are lifted up and turned over 90 degrees in sections in the present invention.

[0052] Fig.14 It is a schematic diagram of the pile legs after being hoisted up and turned over 90 degrees in sections in the present invention.

[0053] Fig.15 It is a schematic diagram of the pile leg segmentation, the upper pile fixing frame, and the lower pile fixing frame inserted into the pile shoe in the present invention.

[0054] The following are the descriptions of the reference numerals:

[0055] 1. Pile leg segmentation; 11. Main leg; 12. Lifting lug;

[0056] 2. pile shoe; 21. bottom plate; 22. positioning plate; 23. top plate; 231. reference cross line; 24. pontoon plate; 25. vertical plate; 26. internal reinforcement plate; 27. pontoon reinforcement plate;

[0057] 3. Upper pile fixing frame; 4. Lower pile fixing frame; 5. Gear box; 6. Wear-resistant plate;

[0058] 71. Balance beam; 72. Main hook; 73. Wire rope; 74. Rope guard. DETAILED DESCRIPTION

[0059] Although the present invention can be easily embodied in different forms of embodiments, only some of the specific embodiments are shown in the drawings and will be described in detail in this specification. It should be understood that this description should be regarded as an exemplary illustration of the principles of the invention and is not intended to limit the invention to that described herein.

[0060] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the present invention, rather than implying that each embodiment of the present invention must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0061] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) used to explain the structure and movement of various elements of the present invention are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the description of the positions of these elements changes, the indications of these directions also change accordingly.

[0062] It should be noted that conventional pile legs are mostly triangular truss structures, and the pile legs include three rack plates and half-side pipe structures attached to the opposite sides of the rack plates. The pile legs are more than one hundred meters high, so they are usually divided into several pile leg sections during construction. Since the pile shoes and pile legs are important structures for supporting platforms or ships operating at sea, they have extremely high requirements for structural strength and rigidity. Therefore, the main rack plate and half-side pipe structure at the lower end of the pile leg section must penetrate and reach the pile shoe bottom plate. Through the welding of the internal structure of the pile shoe with the rack plate and half-side pipe of the pile leg, it is ensured that when the ship is in operating condition, the overall force of the ship is transmitted between the pile shoe and the pile leg.

[0063] At present, during the construction process, it is often necessary to cut the rack and half-side pipe inserted into the pile shoe at the outer side of the pontoon above the pile shoe top plate. This part of the rack and half-side pipe assembly inserted into the pile shoe is called a blind tooth. In order to ensure that the length of the short section of the half-side pipe between the bottom pile leg segment and the blind tooth is not less than 600mm, and the distance between the butt welds is not less than 200mm, etc., it is usually necessary to lift the entire main hull by about 500mm, so that there is a certain space between the pile shoe top plate and the bottom plate of the hull's well section, to ensure that the above-mentioned regulatory requirements and personnel construction space are met. Among them, the lifting of the main hull requires an additional construction cost of millions, which greatly increases the difficulty of hull closure, pier laying and pier removal, as well as the construction period.

[0064] The blind teeth located in the pile shoe serve as the bulk structure of the pile shoe segment. They are positioned and installed one by one after the pile shoe is closed. After the blind teeth are welded, the pile leg segment is hoisted and closed to dock with the upper end of the blind teeth of the pile shoe. Due to the large thickness of the rack plate and the half-side pipe, the welding of the rack plate and the half-side pipe is difficult and requires high technical requirements. In addition, when the pile leg segment is inserted into the pile shoe, the large vertical plate of the pile shoe interferes with the pile insertion, and the interfering part needs to be cut.

[0065] In summary, the construction period of pile leg segmentation and pile shoe driving operation is relatively long.

[0066] The large amount of cross-operations concentrated inside the shaft of the lifting system also resulted in poor environmental characteristics.

[0067] Therefore, the inventor of the present application creatively provides a pile leg plugging and closing method, which avoids the existence of the rack plate and the half-side tube short section docking interface from the design aspect, avoids raising the pier height of the main hull construction, and reduces the pier cost. The inserted pile leg closing method avoids the work of bulk blind teeth, and also greatly reduces the invalid operations such as closing blind teeth and half-side tube process short sections, greatly reduces the construction workload and construction difficulty, shortens the construction period and reduces the construction cost, and improves the construction environment.

[0068] Figure 1 The schematic diagram of the process of the pile leg plugging and closing method is shown in FIG. Figure 1 The pile leg plugging and closing method comprises the following steps:

[0069] S1, construction of pile leg section 1 and pile shoe 2.

[0070] S11, construct the pile leg segment 1 and the pile shoe 2 respectively, so that the tolerance directions of the two are in the same direction and are both controlled within the preset tolerance range; mark the reference cross line 231 of the pile leg insertion position on the pile shoe 2.

[0071] The construction of the pile leg segment 1 and the pile shoe 2 can be carried out at the same time, or the pile leg segment 1 can be built first and then the pile shoe 2, or the pile shoe 2 can be built first and then the pile leg segment 1. The specific construction order can be selected according to actual needs.

[0072] It should be noted that generally, a self-elevating drilling platform has three lifting systems, and a self-elevating wind turbine installation vessel has four lifting systems, and each lifting system corresponds to a pile shoe 2. The pile shoe 2 is an important reference section for the closure of the basic hull section, the well section and the pile leg section 1, and is built first and closed first. Figure 2 , which shows a schematic diagram of the leg segments 1 being distributed on a platform. That is, leg segments 1 are arranged at the four corners of a platform.

[0073] See also Figure 3 The pile leg segment 1 includes three main legs 11 arranged in parallel and at intervals. The three main legs 11 are arranged in a manner of enclosing to form a triangle, and the main legs 11 are connected by diagonal braces, that is, the cross-section of the pile leg segment 1 is triangular.

[0074] The construction of pile leg segment 1 is strictly in accordance with the construction drawings. Following the construction process, the large group is constructed on a special segment construction frame. The main dimensional accuracy of the pile leg segment 1 is matched with the lifting system. In each construction stage, the main dimensions and related accuracy of the pile leg are controlled, and the accuracy deviation is corrected in time.

[0075] Specifically, when constructing the pile leg segment 1, the position accuracy deviation between the three main legs 11 of the pile leg segment 1 is less than or equal to 3 mm.

[0076] See also Figure 4 The position accuracy means that the absolute value of the difference between any two of the lengths L1, L2, and L3 between any two adjacent main legs 11 is less than or equal to 3 mm, that is, |L1-L2|≤3 mm.

[0077] |L2-L3|≤3mm, |L1-L3|≤3mm.

[0078] The torsion of any main leg 11 of the leg section 1 is less than or equal to 0.00025 RAD. Figure 5 , torsion refers to the angle deviation θ of the constructed leg segment 1 relative to the theoretically calculated leg segment 1. When calculating the torsion, the center of the actual leg segment 1 coincides with the center of the theoretical leg segment 1.

[0079] The tolerance of the triangle deformation of leg segment 1 is 0.07°. Figure 6 The triangle deformation tolerance refers to the tolerance of the angle α between the lines connecting any two adjacent main legs 11 to the center of the pile leg segment 1. That is, the angle α between any two connecting lines is 120°±0.07°.

[0080] The rack torsion tolerance of leg segment 1 is ±0.25°. Figure 6 The gear torsion tolerance refers to the tolerance of the angle β between the extension direction of the rack plate and the line connecting the rack plate and the center. That is, the angle β between any rack plate and the line connecting the rack plate and the center is 90°±0.25°.

[0081] The above is an introduction to the construction of pile leg section 1, and the construction of pile shoe 2 will be introduced next.

[0082] See also Figure 7 The pile shoe 2 includes a bottom plate 21 and three positioning plates 22 arranged at intervals on the bottom plate 21, and the positioning plates 22 correspond to the three main legs 11 of the pile leg. The position accuracy tolerance of the three positioning plates 22 is in the same direction as the position accuracy tolerance of the three main legs 11, and is less than or equal to 3mm.

[0083] See also Figure 8 The pile shoe 2 includes a top plate 23 spaced above the bottom plate 21, a pontoon plate 24 spaced above the top plate 23, and a vertical plate 25 extending vertically and upwardly beyond the pontoon plate 24. The number of the vertical plates 25 is also three, and the position accuracy deviation of the three vertical plates 25 is less than or equal to 3 mm.

[0084] See also Fig. 9 The pile shoe 2 includes an internal reinforcement plate 26 disposed in the space between the top plate 23 and the bottom plate 21 and a pontoon reinforcement plate 27 disposed in the space between the top plate 23 and the bottom plate 21. There is a gap of 2 to 3 mm between the top plate 23, the pontoon plate 24, the vertical plate 25, the internal reinforcement plate 26 and the pontoon reinforcement plate 27 and the main leg 11 of the pile leg.

[0085] See also Fig.10 When marking the reference cross line 231 of the pile leg insertion position on the pile shoe 2, specifically, the reference cross line 231 on the pile shoe 2 is marked on the top plate 23. When the pile shoe 2 is closed, the closing is performed based on the closing line drawing of the main hull on the slipway, and the focus is on ensuring that when the pile shoe 2 is closed, the reference cross line 231 of the insertion position of the pile shoe 2 is accurately positioned on the slipway.

[0086] During the construction of the pile shoe 2, welding is carried out from the middle to the surrounding areas.

[0087] After the pile leg and pile shoe 2 are closed, Fig.11 shown.

[0088] S12, closing the well enclosure sections so that the well enclosure deck reference line coincides with the horizontal projection of the reference cross line 231 on the pile shoe 2.

[0089] After the pile shoe 2 is closed in sections, the well enclosure section is closed. Specifically, the positioning benchmark of the pile frame of the well enclosure section is surveyed and marked on the main deck.

[0090] S13, closing the lower pile fixing frame so that the rack reference line of the lower pile fixing frame coincides with the reference line of the well enclosure deck and the horizontal projection of the reference cross line 231.

[0091] After the enclosure is closed in sections, close the lower pile frame so that the rack reference line of the lower pile frame coincides with the horizontal projection of the enclosure deck and the pile shoe 2 pile reference line.

[0092] S14, closing the upper pile fixing frame 3, so that the rack center reference line of the upper pile fixing frame 3 coincides with the rack reference line of the lower pile fixing frame, the well deck reference line and the horizontal projection of the reference cross line 231.

[0093] Finally, the upper pile fixing frame 3 with the gear box 5 is closed, and the rack center reference line of the upper pile fixing frame 3 is made to coincide with the horizontal projection of the above-mentioned reference when closing.

[0094] Specifically, the position accuracy deviation between the three upper pile frames 3 is less than or equal to 3 mm, and the triangle deformation tolerance between the three upper pile frames 3 is 0.07°, and they are all in the same direction as the deviation of the pile leg segment 1. If there is a deviation, it is corrected in time during the construction process.

[0095] S15, adjust the tooth tip of the gear box 5 so that it faces downward.

[0096] Specifically, in the step of adjusting the tooth tip of the gear box 5 so that it faces downward, the angle between the tooth tip with the smallest angle with the horizontal plane and facing downward and the horizontal plane is 15° to 35°. That is, among all the tooth tips facing downward, the tooth tip with the smallest angle with the horizontal plane is the minimum angle tooth tip, and the angle between the minimum angle tooth tip and the horizontal plane is 15° to 35°.

[0097] After the step of adjusting the tooth tip of the gear box 5 to face downward, the method further includes installing wear-resistant plates 6 on the upper pile frame 3 and the lower pile frame.

[0098] The thickness of the wear-resistant plate 6 needs to be determined based on the measured deformation tolerance of the triangle after the upper and lower pile frames are closed and the opening size of the left and right structural foundation plates, and then installed after machining.

[0099] In addition, other accessories such as bolts are also installed at the same time.

[0100] S2, hoisting of pile leg section 1 and closing of pile insertion.

[0101] S21, flipping the pile leg segment 1 to make it extend vertically.

[0102] The pile leg section 1 is constructed and transported in a horizontal lying position, so it needs to be turned over during the pile insertion and closing operation to extend it vertically.

[0103] Combination Fig.12 and Fig.13 The lifting equipment includes a balance beam 71, a steel wire rope 73 suspended below the balance beam 71, and a shackle arranged on the steel wire rope 73. The lifting ears 12 on the two main legs 11 of the pile leg segment 1 are connected through the shackle. Specifically, the main hook 72 on the balance beam 71 hooks the steel wire rope 73 and connects with the main leg 11 at the bottom position above the pile leg segment 1, and is protected by a rope guard 74. After the balance beam 71 is lifted to a high altitude, and the pile leg segment 1 is also lifted to a high altitude in an overall horizontal manner, the main hook 72 is lowered, so that the pile leg segment turns 190 degrees and stands on the ground or platform that meets the bearing capacity.

[0104] S22, lowering the pile leg segment 1, so that the rack plate is inserted between the gears of the left and right gear box 5 of the upper pile fixing frame 3.

[0105] Specifically, in the step of lowering the pile leg segment 1 so that the rack plate is inserted between the gears of the left and right gear box 5 of the upper pile fixing frame 3: the turned-over pile leg segment 1 is lifted above the upper fixing frame, the installation direction of the pile leg segment 1 is adjusted, and the pile leg segment 1 is lowered so that the main leg 11 of the pile leg segment 1 is slowly inserted between the wear-resistant plates 6 on both sides of the upper pile fixing frame 3.

[0106] First, the wire rope 73 and the rope guard 74 of the main hook 72 are removed by an aerial vehicle, and the wire rope 73 tied to the main hook 72 is re-hung on the lifting lug 12 above the main leg 11 through a shackle. Fig.14 shown.

[0107] The leg segment 1 is lifted so that the bottom of the leg segment 1 is lifted above the top plate 23 of the upper pile fixing frame 3, and then the leg segment 1 is adjusted to the installation direction using the stabilizing rope tied to the leg segment 1 in advance, and then the rack main leg 11 of the leg segment 1 is inserted into the upper guide of the upper pile fixing frame 3. The load of the crane for lifting the leg segment 1 is also gradually reduced.

[0108] During the process of lowering the pile leg, the crane continuously lowers the pile leg segment 1, and uses the deadweight of the pile leg segment 1 to insert the rack plate of the main leg 11 at the bottom of the pile leg segment 1 into the gears of the left and right gear boxes 5 of the pile fixing frame. Fig.15 shown.

[0109] S23, the pile leg segment 1 is moved downward by driving the gear of the gear box 5 until the bottom of the pile leg moves downward to a preset installation position in the pile shoe 2.

[0110] After the rack plate of the main leg 11 at the lower part of the pile leg section 1 is inserted between the gears of the left and right gear box 5 of the pile fixing frame, the pile leg section 1 is then pushed downward through the gear of the gear box 5. During the lowering process of the pile leg section 1, the crane hoisting the pile leg section 1 also drops down and unloads slowly and evenly until it reaches zero, and follows the lowering of the hook head of the main hook 72 according to the position of the pile leg section 1.

[0111] Among them, in the step of moving the pile leg segment 1 downward by driving the gear of the gear box 5, the pile leg segment 1 is inserted into the pontoon top plate 23 of the pile shoe 2, the internal structure of the pontoon, the top plate 23 of the pile shoe 2 and the internal reinforcement structure of the pile leg in sequence, until the main leg 11 of the pile leg segment 1 falls on the positioning plate 22 of the pile shoe 2.

[0112] Monitor the downward movement of leg segment 1 and eliminate interfering structures.

[0113] During the above-mentioned downward movement process, a dedicated person is set up to monitor the insertion position of the three main legs 11 of the pile leg segment 1 to avoid structural interference such as the large vertical plate 25 of the pile shoe 2, the top plate 23 of the pontoon, the pontoon reinforcement structure, the top plate 23 of the pile shoe 2, and the internal reinforcement structure of the pile shoe 2. Several personnel are also set up around the surrounding well to monitor the interference between the pile leg segment 1 and the surrounding structures such as the pile frame and the surrounding well. If there is interference, it will be promptly checked and eliminated.

[0114] S3. Welding.

[0115] S31, welding the pile leg segment 1 and the pile shoe 2.

[0116] Before welding the pile leg segment 1 and the pile shoe 2, check the alignment of the weld position and grind it after it is correct. Grind to remove iron filings, rust and other oxides.

[0117] In the steps of welding the pile leg segment 1 and the pile shoe 2, vertical welding is performed first and then horizontal welding; when welding vertically, reverse welding is adopted in the upward segmentation.

[0118] Welding is performed symmetrically using an even number of welding positions.

[0119] Preheating is also performed before welding. That is, the welding is preheated strictly according to the welding process and the welding parameters specified in the process are selected.

[0120] After welding is completed, the weld position is heat treated and flaw detection is performed. After passing the inspection, the weld position is subjected to tightness testing and painting, and the pile insertion and closure of the pile leg section 1 is completed.

[0121] After the pile leg segment 1 and the pile shoe 2 are closed, the pile leg segment 1 can be closed with the pile leg segment 1, that is, on the basis of the closed pile shoe and the pile leg segment 1, another pile leg segment 1 is hoisted and closed with the pile leg segment 1 on the pile shoe 2. The above work is performed in sequence to complete the closing of the entire pile leg.

[0122] Combined with the above introduction, the pile leg plugging and closing method of the present invention first constructs the pile leg segments and pile shoes separately, and ensures the accuracy of the two, then closes the surrounding well, the upper pile frame and the lower pile frame, and then relies on the gear box to lift and close the pile leg segments in an inserted manner, solving the problem of bulk blind teeth in the pile shoe. Furthermore, the pile leg closing method of inserting the pile shoe as a whole avoids the pile leg rack plate docking and half-side pipe process at the upper position of the top plate of the pile shoe, and at the same time avoids increasing the height of the main hull due to the need to increase the fracture to meet the specification requirements. Through precision control, the integrity of the vertical plate is guaranteed, and the cutting fracture of the vertical plate is avoided.

[0123] Relying on the above-mentioned innovative pile insertion and closing method, the workload can be greatly reduced, the construction period can be shortened, the construction environment can be improved, and the construction period and construction cost can be greatly reduced.

[0124] Exemplarily, the pile leg driving and piling closing method of the present invention can be applied to the pile leg driving and piling closing of the 2,000-ton wind power installation vessel of China Railway Construction.

[0125] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A pile leg plugging and closing method, characterized in that: The following steps are involved: Construction of pile leg sections and pile shoes; The pile leg segments and the pile shoes are constructed separately so that the tolerance directions of the two are in the same direction and are both controlled within a preset tolerance range; a reference cross line of the pile leg insertion position is marked on the pile shoes; Closing the well enclosure sections so that the well enclosure deck reference line coincides with the horizontal projection of the reference cross line on the pile shoe; Closing the lower pile fixing frame so that the rack reference line of the lower pile fixing frame coincides with the horizontal projection of the well enclosure deck reference line and the reference cross line; Closing the upper pile fixing frame, so that the rack center reference line of the upper pile fixing frame coincides with the rack reference line of the lower pile fixing frame, the enclosure deck reference line and the horizontal projection of the reference cross line; Adjust the gear box's tooth tip to face downward; The lifting of pile legs in sections and the closing of pile insertion; Flipping the pile leg segments so that they extend vertically; Lower the pile leg segments so that the rack plate is inserted between the left and right gearbox gears of the upper pile fixing frame; The pile leg segments are moved downward by driving the gears of the gear box until the bottom of the pile leg segments moves downward to a preset installation position in the pile shoe; welding; The pile leg segments and the pile shoes are welded.

2. The pile leg plugging and closing method according to claim 1, characterized in that: The pile shoe comprises a bottom plate and three positioning plates arranged at intervals on the bottom plate, the positioning plates correspond to the three main legs of the pile leg one by one, and the position accuracy tolerance of the three positioning plates is in the same direction as the position accuracy tolerance of the three main legs, and is less than or equal to 3 mm; The pile shoe includes a top plate spaced apart above the bottom plate, a pontoon plate spaced apart above the top plate, and a vertical plate extending vertically and extending upward beyond the pontoon plate, and the position accuracy deviation of the vertical plate is less than or equal to 3 mm.

3. The pile leg plugging and closing method according to claim 2, characterized in that: The reference cross line on the pile shoe is marked on the top plate; The pile shoe includes an internal reinforcement plate arranged in the space between the top plate and the bottom plate and a pontoon reinforcement plate arranged in the space between the top plate and the bottom plate. There is a gap of 2 to 3 mm between the top plate, the pontoon plate, the vertical plate, the internal reinforcement plate and the pontoon reinforcement plate and the main leg of the pile leg.

4. The pile leg plugging and closing method according to claim 1, characterized in that: When constructing the pile leg segment, the position accuracy deviation between the three main legs of the pile leg segment is less than or equal to 3mm; The torsion of any main leg of the pile leg segment is less than or equal to 0.00025 RAD; The triangle deformation tolerance of the pile leg segment is ±0.07°; The rack torsion tolerance of the pile leg segment is ±0.25°.

5. The pile leg plugging and closing method according to claim 1, characterized in that: When closing the upper pile fixing frames, ensure that the position accuracy deviation of the three upper pile fixing frames is less than or equal to 3mm; When the upper pile fixing frames are closed, the triangular deformation tolerance of the three upper pile fixing frames is guaranteed to be ±0.07°.

6. The pile leg plugging and closing method according to claim 1, characterized in that: In the step of adjusting the tooth tip of the gear box to face downward, the angle between the tooth tip with the smallest angle with the horizontal plane and facing downward and the horizontal plane is 15° to 35°; After the step of adjusting the tooth tip of the gear box to face downward, the method further includes installing wear-resistant plates on the upper pile fixing frame and the lower pile fixing frame.

7. The pile leg driving and closing method according to claim 1, characterized in that: In the step of lowering the pile leg segment so that the rack plate is inserted between the left and right gear box gears of the upper pile fixing frame: the turned-over pile leg segment is lifted above the upper fixing frame, the installation direction of the pile leg segment is adjusted, and the pile leg segment is lowered so that the main leg of the pile leg segment is slowly inserted between the wear-resistant plates on both sides of the upper pile fixing frame.

8. The pile leg driving and closing method according to claim 1, characterized in that: In the step of driving the pile leg segments downward by the gear of the gear box, the pile leg segments are sequentially inserted into the pontoon top plate of the pile shoe, the internal structure of the pontoon, the pile shoe top plate and the internal reinforcement structure of the pile leg until the main leg of the pile leg segment falls onto the positioning plate of the pile shoe; The downward movement process of the pile leg segments is monitored to eliminate interfering structures.

9. The pile leg driving and closing method according to claim 1, characterized in that: In the step of welding the pile leg segments and the pile shoes, even-numbered welding positions are used for symmetrical welding; In the step of welding the pile leg segments and the pile shoe, vertical welding is first performed and then horizontal welding is performed; when welding vertically, welding is performed in reverse order of upward segments; Preheating is also performed before welding.

10. The pile leg driving and closing method according to claim 9, characterized in that: Before welding the pile leg segments and the pile shoes, first check the alignment of the weld positions and grind them after confirming that they are correct; After welding is completed, the weld position is heat treated and inspected for flaws. After passing the inspection, the weld position is tested for tightness and painted.

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