Construction method for offshore hoisting, positioning and mounting of large guide pipe supporting frame

Abstract

The invention discloses a construction method for offshore hoisting, positioning and mounting of a large conduit support frame, which can smoothly finish positioning and mounting of the conduit support frame, and is simple in mounting process, high in mounting efficiency and high in mounting precision. The construction method comprises the steps that S10, the guide pipe supporting frame is transported to a bridge site, and the guide pipe supporting frame is implanted; s20, the guide pipe supporting frame is leveled till the top face is horizontal; s30, positioning auxiliary piles are inserted and driven, gaps between second steel pipes and the positioning auxiliary piles are filled with high-strength mortar and filled with gravels to top openings, steel wedges are inserted into the top openings of the guide pipe supporting frames, and the top openings of the guide pipe supporting frames are connected with the positioning auxiliary piles by welding connecting plates; s40, all the self-leveling mechanisms are sequentially dismantled, bearing piles are inserted and driven, gaps between the first steel pipes and the bearing piles are filled with high-strength mortar, gravel is filled to top openings, steel wedges are inserted into the top openings of the guide pipe supporting frames, and the top openings of the guide pipe supporting frames are connected with the bearing piles by welding connecting plates; and S50, a temporary construction platform is erected.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore bridge construction, and in particular to a method for offshore hoisting, positioning, and installing a large-scale conduit support frame. Background Art

[0002] The description in this section merely provides background information related to the disclosure of this specification and does not constitute prior art.

[0003] The main construction trestle of the Xihoumen highway-railway dual-use bridge is more than 200 meters long and is constructed using the conductor frame method. It is divided into three sections: the first section is the 1# and 2# conductor frame platforms, which are 79.7 meters long and connected to the deep-water trestle on the west side; the second section is the 2#, 3#, and 4# conductor frame platforms on the east side of the main tower, which are 119.5 meters long; the third section is the 4# and 5# conductor frame platforms, which are 88.4 meters long.

[0004] However, there are the following problems during construction: 1. The construction area of ​​the bridge site is close to the Xihoumen waterway. The rock surface slope of the 4# pier of the Xihoumen highway-railway dual-use bridge is large, with an inclination of about 30° and no covering layer, which makes it difficult to position and level the jacket and anchor the construction ship. The bedrock is weakly / slightly weathered dacite, with a strength of 60-70MPa. The rock mass is strong, and the mechanical properties are high. It is difficult to insert and pile the steel pipe piles, and the quality is difficult to control.

[0005] 2. The environmental factors in the bridge site are complex, the water is deep, and the water flow is fast. The 4# pier trestle is located in the Xihoumen waterway, with a maximum water depth of 42m, obvious tides and large tidal ranges. The jacket construction ships are greatly affected by waves, and the jacket positioning and sinking are difficult, with high construction safety risks.

[0006] 3. The trestle platform is large in size and requires many offshore construction machinery and equipment; the construction process of the offshore trestle in the bridge site is complex, the substructure construction process is long, and the cost of foundation rock penetration is high.

[0007] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of this specification and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of this specification. Summary of the invention

[0008] In view of the deficiencies in the prior art, an object of this specification is to provide a method for offshore hoisting, positioning and installing a large-scale conduit support frame, which can smoothly complete the positioning and installation of the conduit support frame, with simple installation procedures, high installation efficiency and high installation accuracy.

[0009] To achieve the above-mentioned purpose, the embodiment of this specification provides a method for offshore hoisting, positioning and installing a large-scale conduit support frame, including: Step S10: transporting the catheter support frame to the bridge site by means of a floating crane, and implanting the catheter support frame; wherein, after being transported to the bridge site, adjusting the plane accuracy of the catheter support frame to within 1.0 m by pulling cables on the floating crane, and starting to lower the catheter support frame, and stopping the lowering when the catheter support frame is 0.5 m away from the seabed, and adjusting the plane accuracy of the catheter support frame before implantation to within 0.2 m by pulling cables on the floating crane and the transport barge, and then continuing to lower the catheter support frame to implant the catheter support frame; Step S20: using the floating crane to level the catheter support frame to the top surface level, and using the self-leveling mechanism to make the verticality of the support pile less than 0.5%; wherein the catheter support frame is provided with four support piles, each of which is provided with a self-leveling mechanism, and the self-leveling mechanism can press the support pile back into the rock; the support pile is covered with a first steel pipe; Step S30: using a hydraulic impact hammer to drive the positioning auxiliary pile, pouring high-strength mortar into the gap between the second steel pipe and the positioning auxiliary pile, and then filling crushed stone to the top, and then inserting a steel wedge into the top of the catheter support frame, and then connecting the top of the catheter support frame with the positioning auxiliary pile by welding a connecting plate; wherein the catheter support frame is provided with two or four positioning auxiliary piles, and the positioning auxiliary pile is covered with the second steel pipe; the diameter of the first steel pipe is larger than the diameter of the second steel pipe, and the diameter of the supporting pile is larger than the diameter of the positioning auxiliary pile; Step S40: dismantling each of the self-leveling mechanisms in turn, using the hydraulic impact hammer to drive the supporting piles, pouring high-strength mortar into the gap between the first steel pipe and the supporting piles, and then filling crushed stone to the top opening, and then inserting a steel wedge into the top opening of the catheter support frame, and then connecting the top opening of the catheter support frame to the supporting piles by welding a connecting plate; Step S50: erecting a temporary construction platform, constructing anchor piles, cutting the first steel pipe and the second steel pipe to the designed elevation, using floating crane to install the pile cap, distribution beam, and Bailey beam, and after the Bailey beam is installed, using the fishing method to install the bridge deck system.

[0010] As a preferred implementation, step S10 includes the following steps: Step S11: using a modular vehicle to transport the catheter support frame to a seagoing wharf; Step S12: hoisting the catheter support frame by the floating crane, and cutting off the transport tire frame; Step S13: moving the anchor of the floating crane out of the wharf range, flipping the catheter support frame, and transporting the catheter support frame to the bridge site after flipping; Step S14: adjusting the plane accuracy of the catheter support frame to within 1.0 m by pulling up the cable through the floating crane, and starting to lower the catheter support frame during the low tide period; Step S15: When the catheter support frame is lowered to 0.5m from the seabed, the lowering is stopped, and the plane accuracy of the catheter support frame before landing is adjusted to within 0.2m by pulling the cable on the floating crane and the transport barge, and then the catheter support frame is continued to be lowered to make the catheter support frame landed.

[0011] As a preferred embodiment, in step S10, a total of 6 lifting points are set on the catheter support frame, 4 lifting points are arranged on the top, and 2 lifting points are arranged on the bottom. The lifting points are composed of steel pipes with a diameter of 1500mm and a thickness of 24mm and a steel plate with a thickness of 20mm; the rated lifting capacity of the main hook of the floating crane is 4×650t, and the rated lifting capacity of the auxiliary hook is 2×250t.

[0012] As a preferred implementation, step S12 includes the following steps: Step S121: setting two 8t naval anchors and two 10.5t naval anchors at the tail of the floating crane, setting two 10.5t naval anchors at the bow of the floating crane as forward anchors, and adjusting the lifting distance of the floating crane; Step S122: adjusting the handlebar angle of the floating crane to 55°, the operating distance is 42m from the bow, and at this time, 12m from the dock platform; Step S123: Perform a trial lift, after the tire is 10 cm to 20 cm away from the transport frame, lift it steadily for 10 minutes and check the lifting point; Step S124: After the trial lifting is completed, the conduit support frame is lifted to meet the module vehicle disengagement condition, and the module vehicle drives away from the dock.

[0013] As a preferred implementation, step S13 includes the following steps: Step S131: The floating crane is anchored away from the seagoing wharf area, and the floating crane handle angle is adjusted to 60°; the main and auxiliary hooks of the floating crane hang the guide tube support frame horizontally and motionlessly; the angle of the floating crane boom remains unchanged, the main hook begins to be slowly lowered, and the auxiliary hook is lifted synchronously, and during the process, the main hook is controlled to not exceed the main hook's weight in the horizontal hanging state; Step S132: When the lowering point does not enter the water, the auxiliary hook is continuously lifted and the main hook is lowered synchronously; the angle of the floating crane boom is kept unchanged during the turning process; Step S133: When the catheter support frame turns over to 90 degrees, the two upper hanging ropes on the main hook are both under force; the lower hanging rope on the main hook is loosened from the lower hanging point, and the auxiliary hook is slowly hooked to the top surface of the catheter support frame 2m above the water surface, and the wire rope at the lower hanging point is released.

[0014] As a preferred embodiment, in the step S20, the inclination of the top surface of the catheter support frame is checked, and the catheter support frame is leveled using the floating crane. During leveling, 2 to 3 supporting piles are placed on the bed. When leveling to the top surface, the height difference of the four corners of the catheter support frame does not exceed 20 cm.

[0015] As a preferred embodiment, in step S20, after the catheter support frame is leveled to the top surface using the floating crane, the temporary connecting plates of a pair of diagonal supporting piles are first released, and the supporting piles located at the diagonals are lowered. After the diagonal supporting piles are planted, the floating crane lifts the other two supporting piles, releases the temporary connecting plates, lowers them, and starts the self-leveling mechanism, using the jacks of the self-leveling mechanism to counter-press the supporting piles into the rock.

[0016] As a preferred embodiment, when the self-leveling mechanism is started, the steps of tightening the upper nut, lifting with the jack, tightening the middle nut, and returning the oil with the jack are repeated until the supporting piles are stable and the middle nut is tightened. After all four supporting piles are stable, the floating hook is removed and the weight of the catheter support frame is transferred to the four supporting piles.

[0017] As a preferred implementation, in the step S30, the positioning auxiliary piles in the unimplanted areas are preferentially inserted.

[0018] As a preferred embodiment, in the step S40, each of the self-leveling mechanisms is removed in diagonal order; when removing the self-leveling mechanism, the steps are performed in sequence: loosen the top bolt 10 cm upwards, lift with a jack, loosen the middle nut, return oil to the jack, loosen the upper nut, and remove the jack from top to bottom. Beneficial Effects

[0019] The present embodiment provides a method for offshore hoisting, positioning and installing a large-scale conduit support frame. The conduit support frame is transported to the bridge site by a floating crane, and the plane accuracy of the conduit support frame is adjusted to within 1.0m by pulling cables on the floating crane, and then the conduit support frame is lowered. When the conduit support frame is lowered to 0.5m from the seabed, the lowering is stopped, and the plane accuracy of the conduit support frame before landing is adjusted to within 0.2m by pulling cables on the floating crane and the transport barge, and then the conduit support frame is continued to be lowered to land the conduit support frame; at the same time, the plane height difference of the conduit support frame is adjusted by using 4 supporting piles in conjunction with the self-leveling mechanism, so that the verticality of the supporting piles is less than 0.5%. The offshore hoisting, positioning and installing construction method of a large-scale conduit support frame can successfully complete the positioning and installation of the conduit support frame, and the installation process is simple, the installation efficiency is high and the installation accuracy is high.

[0020] With reference to the following description and the accompanying drawings, the specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope thereby.

[0021] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0022] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 A flowchart of the steps of a method for offshore hoisting, positioning and installation of a large-scale conduit support frame provided in this embodiment; Figure 2 This is a schematic structural diagram of a catheter support frame provided in this embodiment; Figure 3 This is a schematic structural diagram of another catheter support frame provided in this embodiment; Figure 4 for Figure 1 The construction diagram of step S10; Figure 5 for Figure 1 The construction diagram of step S20; Figure 6 It is a structural schematic diagram of a self-leveling mechanism provided in this embodiment.

[0025] Description of reference numerals: 1. Conduit support frame; 11. Upper hanging point; 12. Lower hanging point; 2. Support pile; 3. First steel pipe; 4. Positioning auxiliary pile; 5. Second steel pipe; 6. Self-leveling mechanism; 61. Upper nut; 62. Jack; 63. Middle nut; 64. Temporary connecting plate; 7. Floating crane; 71. Main hook; 72. Auxiliary hook; 73. Upper hanging rope; 74. Lower hanging rope; 75. Handlebar; 8. Module car; 9. Transport tire frame. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0027] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be another element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be another element centered thereon at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] See also Figure 1 The embodiment of the present application provides a method for offshore hoisting, positioning and installation of a large-scale conduit support frame, comprising: Step S10: transport the catheter support frame 1 to the bridge site by means of the floating crane 7, and implant the catheter support frame 1.

[0030] Among them, after being transported to the bridge site, the plane accuracy of the catheter support frame 1 is adjusted to within 1.0m by pulling the cable on the floating crane 7, and the catheter support frame 1 begins to be lowered. When the catheter support frame 1 is lowered to 0.5m away from the seabed, the lowering is stopped, and the plane accuracy of the catheter support frame 1 before implantation is adjusted to within 0.2m by pulling the cable on the floating crane 7 and the transport barge, and then the catheter support frame 1 is continued to be lowered to implant the catheter support frame 1.

[0031] Step S20: using the floating crane 7 to level the conduit support frame 1 to the top surface level, and using the self-leveling mechanism 6 to make the verticality of the support pile 2 less than 0.5%.

[0032] The catheter support frame 1 is provided with four supporting piles 2, each supporting pile 2 is provided with a self-leveling mechanism 6, and the self-leveling mechanism 6 can press the supporting pile 2 back into the rock; the supporting pile 2 is covered with a first steel pipe 3.

[0033] Step S30: Use a hydraulic impact hammer to drive the positioning auxiliary pile 4, pour high-strength mortar into the gap between the second steel pipe 5 and the positioning auxiliary pile 4, and then fill it with crushed stone to the top opening, and then insert a steel wedge into the top opening of the catheter support frame 1, and then connect the top opening of the catheter support frame 1 to the positioning auxiliary pile 4 by welding the connecting plate.

[0034] Among them, the catheter support frame 1 is provided with two or four positioning auxiliary piles 4, and the positioning auxiliary piles 4 are covered with the second steel pipe 5; the diameter of the first steel pipe 3 is larger than the diameter of the second steel pipe 5, and the diameter of the supporting pile 2 is larger than the diameter of the positioning auxiliary pile 4.

[0035] Step S40: dismantle each of the self-leveling mechanisms 6 in turn, use the hydraulic impact hammer to drive the supporting piles 2, pour high-strength mortar into the gap between the first steel pipe 3 and the supporting piles 2, and then fill it with gravel to the top, and then insert a steel wedge into the top of the catheter support frame 1, and then connect the top of the catheter support frame 1 to the supporting piles 2 by welding the connecting plate.

[0036] Step S50: set up a temporary construction platform, construct anchor piles, cut the first steel pipe 3 and the second steel pipe 5 to the design elevation, use the floating crane 7 to install the pile cap, distribution beam, and Bailey beam, and after the Bailey beam is installed, use the fishing method to install the bridge deck system.

[0037] The present embodiment provides a method for offshore hoisting, positioning and installing a large-scale conduit support frame. The conduit support frame 1 is transported to the bridge site by a floating crane 7. The plane accuracy of the conduit support frame 1 is adjusted to within 1.0m by pulling a cable on the floating crane 7. The conduit support frame 1 is then lowered. When the conduit support frame 1 is lowered to 0.5m from the seabed, the lowering is stopped. The plane accuracy of the conduit support frame 1 before landing is adjusted to within 0.2m by pulling a cable on the floating crane 7 and the transport barge. Then, the conduit support frame 1 is continued to be lowered to land the conduit support frame 1. At the same time, the four supporting piles 2 are used in conjunction with the self-leveling mechanism 6 to adjust the plane height difference of the conduit support frame 1 so that the verticality of the supporting piles 2 is less than 0.5%. The offshore hoisting, positioning and installing method for a large-scale conduit support frame 1 can smoothly complete the positioning and installation of the conduit support frame 1. The installation process is simple, the installation efficiency is high and the installation accuracy is high.

[0038] In this embodiment, the step S10 specifically includes the following steps: Step S11: Use the module vehicle 8 to transport the catheter support frame 1 to the sea-going wharf to prepare for hoisting (the self-leveling mechanism 6, construction safety passage, etc. are all installed in the factory).

[0039] Among them, two groups of module carts 8 are used for transportation. Each group of module carts 8 is 32.5m long and 3.25m wide. The height can be adjusted within the range of 1500±350mm. During transportation, the two groups of module carts 8 are symmetrically arranged at the bottom of the outer tubes on both sides of the catheter support frame 1. The total load capacity of the module carts 8 can reach 40×40=1600 tons, which meets the requirements for transporting the catheter support frame 1.

[0040] The catheter support frame 1 is transported and assembled at the seagoing wharf. The wharf basin size is 36m×130m, and the wharf trestle is 12m wide, which meets the transportation conditions of the module vehicle 8.

[0041] Step S12: using the floating crane 7 to horizontally lift the catheter support frame 1 and cut off the transport tire frame 9.

[0042] Among them, according to the preliminary investigation and cost analysis, combined with the lifting weight of the conduit support frame 1, the floating crane 7 can use the "Donghaigong 7" 2600t self-propelled floating crane 7, whose main hook 71 has a rated lifting weight of 4×650t and the auxiliary hook 72 has a rated lifting weight of 2×250t. Through the simulation of the lifting and turning process of the conduit support frame 1 and the maximum lifting weight under various working conditions, when the angle of the handle 75 of the floating crane 7 is 60°, the single main hook 71 has a safe load of 500t, the single auxiliary hook 72 has a safe load of 250t, and the lifting height is 81m, which meets the construction requirements of the conduit support frame 1.

[0043] When the width of the catheter support frame 1 does not meet the transportation conditions in the transportation state, an additional transport tire frame 9 needs to be set up. The transport tire frame 9 is welded together by steel pipes with diameters of 1.5m, 1m and 0.63m. The transport tire frame 9 is welded to the catheter support frame 1 in advance before the catheter support frame 1 is transported.

[0044] The module car 8 for transporting the conduit support frame 1 is arranged in two rows, which are symmetrically arranged at the bottom of the steel pipe piles outside the conduit support frame 1. Each row has 20 axles, is 32.5m long (4.5m for the power head + 28m for the vehicle body), and is 3.25m wide. A steel pipe tire rack is set on the top of the module car 8 to ensure the stability of the steel pipe during transportation.

[0045] Step S13: the anchor of the floating crane 7 is moved out of the wharf range, and the conduit support frame 1 is turned over. After the conduit support frame 1 is turned over, it is transported to the bridge site.

[0046] Step S14: The plane accuracy of the conduit support frame 1 is adjusted to within 1.0 m by pulling up the cable through the floating crane 7, and the conduit support frame 1 is lowered during the low tide period (the flow rate is less than 1 m / s) to reduce the influence of the water flow on the positioning of the conduit support frame 1.

[0047] Step S15: When the catheter support frame 1 is lowered to 0.5m from the seabed, the lowering is stopped, and the plane accuracy of the catheter support frame 1 before implantation is adjusted to within 0.2m by pulling the cable on the floating crane 7 and the transport barge, and then the catheter support frame 1 is continued to be lowered to implant the catheter support frame 1.

[0048] In the step S10, the catheter support frame 1 is hoisted and lowered as a whole by a large floating crane 7. Since there is no large gantry crane in the processing site of the catheter support frame 1 to complete the vertical rotation of the catheter support frame 1, the catheter support frame 1 needs to be transported flat to the site for vertical rotation after processing. According to the hoisting capacity of the floating crane 7 and the structural form of the catheter support frame 1, a total of 6 hanging points are arranged on the catheter support frame 1, 4 hanging points are arranged on the top (i.e., 4 upper hanging points 11), and 2 hanging points are arranged on the bottom (i.e., 2 lower hanging points 12). The hanging points are composed of steel pipes with a diameter of 1500mm and a thickness of 24mm and steel plates with a thickness of 20mm, all of which are arranged on the 4 main pipes (with a diameter of 1800mm) in the middle of the catheter support frame 1. The hanging point is designed at the connection system position of the catheter support frame 1, which is both a part of the connection system and a hanging point of the catheter support frame 1. Since the hanging point of the catheter support frame 1 is designed to be close to the inner side of the center line of the trestle, there is no need to set up a special hoist during hoisting, and the sling is directly connected to the main hook 71 and the auxiliary hook 72 of the floating crane 7. During the vertical rotation of the catheter support frame 1, a single lifting point is subjected to greater force, and the main pipe and connection system at the location where the lifting lug is set need to be strengthened, and the φ820×10mm is adjusted to φ1000×14mm to ensure the safety of the catheter support frame 1 lifting.

[0049] Through the analysis of the reaction force of the catheter support frame 1 lifting point and the comparison of the configuration of the own slings and slings, the rated load of the slings is much greater than the lifting reaction force of each lifting point of the catheter support frame 1, and the lifting conditions are met. The sling configuration of the catheter support frame 1 is as follows: ① Configuration of the lifting rope at the lifting point 11: The lifting rope 73 connected to the lifting point 11 adopts the LR-300 polyester ring sling with a rated load of 300t, which meets the lifting requirements of the conduit support frame 1. The safety factor is 6 times, the length of the sling is 68m, and lifting rings are set at both ends of the sling. The conduit support frame 1 is back-looped when lifting; ② Configuration of the lifting rope at the lower lifting point 12: The lower lifting rope 74 connected to the lower lifting point 12 adopts LRH-250 high-strength fiber circular sling with a rated load of 250t, which meets the lifting requirements of the catheter support frame 1, with a safety factor of 6 times, and a circular sling length of 20m. Two circular slings are used for a single lifting point; ③ Analysis of lifting height: The longest casing length of the catheter support frame 1 is 38m, the main lifting point adopts a 68m sling back pocket arrangement, and the maximum length of the sling is 34m. At this time, the lifting height is 72m. The maximum lifting height of the floating crane 7 is 81m at a 60° pole angle, which meets the requirements.

[0050] In this embodiment, before processing and manufacturing the catheter support frame 1, in order to ensure that the casing of the catheter support frame 1 basically fits with the seabed, it is necessary to first conduct a seabed scan of the construction area of ​​the catheter support frame 1, clarify the seabed elevation corresponding to the position of the casing of each catheter support frame 1, and customize the casing according to the elevation.

[0051] When processing and manufacturing the conduit support frame 1, it was taken into consideration that the construction area of ​​the 4# pier main tower was a shallow (no) covering layer area, in which the bedrock was mainly weakly weathered dacite, and the rock strength was above 2000kpa, which made it difficult for the construction platform to drive piles, and the rock penetration depth was insufficient, making it difficult to form a fixed end. It was also affected by the water depth and waves. The larger the diameter of the steel pipe pile, the greater the horizontal forces such as water flow force and wave force. Therefore, the 4# main tower construction platform adopted the construction plan of "conduit support frame 1 + supporting pile 2".

[0052] The structure of the catheter support frame 1 adopts a long casing + connection system structure, which is assembled and processed as a whole in the processing plant. The casing of the catheter support frame 1 adopts a first steel pipe 3 with a diameter of 1800mm and a thickness of 18mm and a second steel pipe 5 with a diameter of 1500mm and a thickness of 16mm. Among them, the first steel pipe 3 is covered with a 1.5m steel pipe, and a 1.2m concrete anchor pile is constructed as the supporting pile 2. The second steel pipe 5 is covered with a 1.2m steel pipe, and only the sinking pile is constructed as an open steel pipe pile. The bottom of the casing of the catheter support frame 1 is cut pile by pile according to the previous seabed scanning results.

[0053] The connection system uses three specifications of steel pipes: 820mm diameter and 10mm thickness, 630mm diameter and 10mm thickness, and 426mm diameter and 8mm thickness. The catheter support frame 1 is designed in two forms, namely Figure 2 The "6 piles" catheter support frame 1 shown is similar to the Figure 3 The "8-pile" conduit support frame 1 shown. The four corner piles of the 6-pile conduit support frame 1 are supporting piles 2, and the two middle piles are positioning auxiliary piles 4; the four middle piles of the 8-pile conduit support frame 1 are supporting piles 2, and the four outer corner piles are positioning auxiliary piles 4.

[0054] The manufacturing of supporting steel pipe piles adopts the spiral weld whole pile production process. When the steel plate is laid out, the cutting, grinding and planing should be pre-placed according to the process requirements. In order to reduce the deformation of the steel pipe pile during the sinking process, a reinforcing steel plate with a thickness of 16mm is set within the bottom of the top of the steel pipe pile. The reinforced steel plate is set inside the bottom mouth; in order to reduce the resistance during the sinking process of the steel pipe pile, an alloy head blade foot is set at the bottom of the steel pipe pile. When the size of the steel pipe cannot meet the size requirements of the prefabrication of the steel pipe pile and the connection system, it should generally be spliced ​​before precise cutting. The extension weld needs to adopt double-sided groove welding, the weld needs to be fully melted, and the quality grade is level 2. The connection between steel pipes adopts circumferential intersecting welding, the weld height hf=8mm, and the appearance quality standard of the fillet weld is level 3.

[0055] In this embodiment, step S12 includes the following steps: Step S121: setting two 8t naval anchors and two 10.5t naval anchors at the tail of the floating crane 7, setting two 10.5t naval anchors at the bow of the floating crane 7 as forward anchors, and adjusting the lifting distance of the floating crane 7; Step S122: adjusting the angle of the handlebar 75 of the floating crane 7 to 55°, the operating distance is 42m from the bow, and at this time, it is 12m from the dock platform, and the lifting capacity is 2×400t+2×250t, which meets the lifting requirements of the catheter support frame 1; Step S123: Perform a trial lift, after being detached from the transport frame by 910 cm to 20 cm, lift it steadily for 10 minutes, and check the lifting points and other important load-bearing components; Step S124: After the trial lifting is completed, the catheter support frame 1 is lifted to meet the disengagement condition of the module vehicle 8, and the module vehicle 8 drives away from the dock.

[0056] Specifically, Figure 4 As shown, step S13 includes the following steps: Step S131: The floating crane 7 is anchored away from the seagoing wharf area, and the angle of the floating crane 7 handle 75 is adjusted to 60°; the main hook 71 and the auxiliary hook 72 of the floating crane 7 hang the catheter support frame 1 horizontally and motionlessly; the angle of the upper arm of the floating crane 7 remains unchanged, the main hook 71 begins to slowly lower, and the auxiliary hook 72 is lifted synchronously, and during the process, the lifting weight of the main hook 71 is controlled not to exceed the lifting weight of the main hook 71 in the horizontal hanging state; Step S132: When the lower hanging point 12 is not submerged in water, the auxiliary hook 72 is continuously lifted and the main hook 71 is lowered synchronously; during the turning process, the angle of the upper arm of the floating crane 7 is kept unchanged; Step S133: When the catheter support frame 1 turns over to 90 degrees, the two upper hanging ropes 73 on the main hook 71 are both under force; the lower hanging rope 74 on the main hook 71 is loosened from the lower hanging point 12, and the auxiliary hook 72 is slowly hooked to the top surface of the catheter support frame 1 about 2m above the water surface, and the wire rope of the lower hanging point 12 is released.

[0057] During the turning process, the boom angle of the floating crane 7 remains unchanged at 60°, and the auxiliary hook 72 is slowly lowered while the main hook 71 is lifted synchronously while the lower hanging point 12 is controlled not to enter the water. During the turning process, it is important to pay attention to whether the weight change of each hook of the floating crane 7 is basically consistent with the model analysis, and whether the total weight of the hook is consistent with the catheter support frame 1.

[0058] In this embodiment, in the step S20, the inclination of the top surface of the catheter support frame 1 is checked, and the catheter support frame 1 is leveled using the floating crane 7. During leveling, 2 to 3 support piles 2 are placed on the bed. When leveling to the top surface level, the height difference of the four corners of the catheter support frame 1 does not exceed 20 cm.

[0059] Specifically, in step S20, after the catheter support frame 1 is leveled to the top surface level by using the floating crane 7, first, the temporary connecting plates 64 of a pair of diagonal supporting piles 2 are released (if the supporting piles 2 are directly implanted, the temporary connecting plates 64 can be directly released; if the supporting piles 2 are not implanted, other floating cranes 7 can be used to lift the supporting piles 2, and then the temporary connecting plates 64 are released), and the supporting piles 2 located at the diagonal are lowered. After the diagonal supporting piles 2 are implanted, the floating crane 7 lifts the other two supporting piles 2, releases the temporary connecting plates 64, lowers them to implant, and starts the self-leveling mechanism 6, and uses the jacks 62 of the self-leveling mechanism 6 to counter-press the supporting piles 2 into the rock.

[0060] Specifically, Figure 5 and Figure 6 As shown, when the self-leveling mechanism 6 is started, the steps of tightening the upper nut 61, lifting the jack 62, tightening the middle nut 63, and returning the oil of the jack 62 are repeated until the supporting pile 2 is stable and the middle nut 63 is tightened. After all four supporting piles 2 are stable, the floating crane 7 is unhooked and the weight of the catheter support frame 1 is transferred to the four supporting piles 2.

[0061] In step S20, considering the positioning accuracy and verticality of the support pile 2, repeated adjustments may be required. The support pile 2 needs to be lifted during the adjustment, and ultimately the verticality of the support pile 2 needs to be ensured to be less than 0.5%.

[0062] In the step S30, the positioning auxiliary piles 4 at the unimplanted areas are preferentially inserted.

[0063] In step S40, each of the self-leveling mechanisms 6 is removed in a diagonal order, and only one set of self-leveling mechanisms 6 is allowed to be removed at a time. When removing the self-leveling mechanism 6, the following steps are performed in sequence: loosening the top bolt 10 cm upward, lifting the jack 62, loosening the middle nut 63, returning the oil to the jack 62, loosening the upper nut 61, and removing the jack 62 from top to bottom.

[0064] In this embodiment, the self-leveling mechanism 6 is a back pressure system of the support pile 2 and a suspension support system that can be used after the catheter support frame 1 is lowered. The self-leveling mechanism 6 is composed from top to bottom: a "cross" top seat + two 200t long-stroke jacks 62 + a "cross" top seat + an anchor seat, and the connection between each part is 8 φ40mm finely rolled threaded steel bars. The anchor seat is welded to the catheter support frame 1 when the catheter support frame 1 is manufactured.

[0065] If the seabed where the duct support frame 1 is lowered is relatively flat, or the duct support frame 1 is an "8-pile" structure, the self-leveling mechanism 6 may not be installed, and the duct support frame 1 can be leveled by a crane ship, and the duct support frame 1 can be positioned by the full-revolving floating crane 7 in conjunction with the insertion of corner piles.

[0066] The anchor seat is processed as a whole in the factory, and is butt-jointed with the pile top of the first steel pipe 3 of the catheter support frame 1 by full penetration, and the weld quality is Grade 2. Except for special marks, all welds are fillet welds, with a weld height of hf=10mm, and the weld quality is Grade 3. After the inner casing is installed, the self-leveling mechanism 6 is installed in the processing plant, and the installation sequence is anchor seat (welded to the corner pile) → "cross top seat" on the top of the supporting pile 2 → jack 62 → upper "cross top seat" → precision rolled threaded steel perforation locking.

[0067] It should be noted that, in the description of this specification, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, and they cannot be understood as indicating or implying relative importance. In addition, in the description of this specification, unless otherwise specified, the meaning of "plurality" is two or more.

[0068] Any numerical value cited herein includes all values ​​of lower and upper values ​​that increase by one unit from the lower limit to the upper limit, and there is at least a two-unit interval between any lower value and any higher value. For example, if the value of the quantity of a component or a process variable (such as temperature, pressure, time, etc.) is set forth to be from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, the purpose is to illustrate that values ​​such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also explicitly listed in the specification. For values ​​less than 1, one unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1. These are merely examples that are intended to be clearly expressed, and it can be considered that all possible combinations of numerical values ​​listed between the lowest value and the highest value are clearly set forth in the specification in a similar manner.

[0069] Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. "About" or "approximately" used with a range applies to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30", including at least the specified endpoints.

[0070] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for all purposes. The term "consisting essentially of..." to describe a combination should include the identified elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe a combination of elements, ingredients, parts or steps herein also contemplates embodiments that consist essentially of these elements, ingredients, parts or steps. By using the term "may", it is intended to indicate that any attribute described that "may" include is optional.

[0071] Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "an" used to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0072] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents possessed by such claims. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a waiver of the subject matter, nor should it be considered that the inventors did not consider the subject matter to be part of the disclosed inventive subject matter.

Claims

1. A method for offshore hoisting, positioning and installation of a large-scale conduit support frame, characterized in that: include: Step S10: transporting the catheter support frame to the bridge site by means of a floating crane, and implanting the catheter support frame; wherein, after being transported to the bridge site, adjusting the plane accuracy of the catheter support frame to within 1.0 m by pulling cables on the floating crane, and starting to lower the catheter support frame, and stopping the lowering when the catheter support frame is 0.5 m away from the seabed, and adjusting the plane accuracy of the catheter support frame before implantation to within 0.2 m by pulling cables on the floating crane and the transport barge, and then continuing to lower the catheter support frame to implant the catheter support frame; Step S20: using the floating crane to level the catheter support frame to the top surface level, and using the self-leveling mechanism to make the verticality of the support pile less than 0.5%; wherein the catheter support frame is provided with four support piles, each of which is provided with a self-leveling mechanism, and the self-leveling mechanism can press the support pile back into the rock; the support pile is covered with a first steel pipe; Step S30: using a hydraulic impact hammer to drive the positioning auxiliary pile, pouring high-strength mortar into the gap between the second steel pipe and the positioning auxiliary pile, and then filling crushed stone to the top, and then inserting a steel wedge into the top of the catheter support frame, and then connecting the top of the catheter support frame with the positioning auxiliary pile by welding a connecting plate; wherein the catheter support frame is provided with two or four positioning auxiliary piles, and the positioning auxiliary pile is covered with the second steel pipe; the diameter of the first steel pipe is larger than the diameter of the second steel pipe, and the diameter of the supporting pile is larger than the diameter of the positioning auxiliary pile; Step S40: dismantling each of the self-leveling mechanisms in turn, using the hydraulic impact hammer to drive the supporting piles, pouring high-strength mortar into the gap between the first steel pipe and the supporting piles, and then filling crushed stone to the top opening, and then inserting a steel wedge into the top opening of the catheter support frame, and then connecting the top opening of the catheter support frame to the supporting piles by welding a connecting plate; Step S50: erecting a temporary construction platform, constructing anchor piles, cutting the first steel pipe and the second steel pipe to the designed elevation, using floating crane to install the pile cap, distribution beam, and Bailey beam, and after the Bailey beam is installed, using the fishing method to install the bridge deck system.

2. The offshore hoisting, positioning and installation construction method of a large-scale conduit support frame according to claim 1 is characterized in that: The step S10 comprises the following steps: Step S11: using a modular vehicle to transport the catheter support frame to a seagoing wharf; Step S12: hoisting the catheter support frame by the floating crane, and cutting off the transport tire frame; Step S13: moving the anchor of the floating crane out of the wharf range, flipping the catheter support frame, and transporting the catheter support frame to the bridge site after flipping; Step S14: adjusting the plane accuracy of the catheter support frame to within 1.0 m by pulling up the cable through the floating crane, and starting to lower the catheter support frame during the low tide period; Step S15: When the catheter support frame is lowered to 0.5m from the seabed, the lowering is stopped, and the plane accuracy of the catheter support frame before landing is adjusted to within 0.2m by pulling the cable on the floating crane and the transport barge, and then the catheter support frame is continued to be lowered to make the catheter support frame landed.

3. The offshore hoisting, positioning and installation construction method of a large-scale conduit support frame according to claim 2 is characterized in that: In step S10, a total of 6 lifting points are set on the catheter support frame, 4 lifting points are arranged on the top, and 2 lifting points are arranged on the bottom. The lifting points are composed of steel pipes with a diameter of 1500mm and a thickness of 24mm and a steel plate with a thickness of 20mm; the rated lifting capacity of the main hook of the floating crane is 4×650t, and the rated lifting capacity of the auxiliary hook is 2×250t.

4. The offshore hoisting, positioning and installation construction method of a large-scale conduit support frame according to claim 3 is characterized in that: The step S12 comprises the following steps: Step S121: setting two 8t naval anchors and two 10.5t naval anchors at the tail of the floating crane, setting two 10.5t naval anchors at the bow of the floating crane as forward anchors, and adjusting the lifting distance of the floating crane; Step S122: adjusting the handlebar angle of the floating crane to 55°, the operating distance is 42m from the bow, and at this time, 12m from the dock platform; Step S123: Perform a trial lift, after the tire is 10 cm to 20 cm away from the transport frame, lift it steadily for 10 minutes and check the lifting point; Step S124: After the trial lifting is completed, the conduit support frame is lifted to meet the module vehicle disengagement condition, and the module vehicle drives away from the dock.

5. The offshore hoisting, positioning and installation construction method of a large-scale conduit support frame according to claim 4 is characterized in that: The step S13 comprises the following steps: Step S131: The floating crane is anchored away from the seagoing wharf area, and the floating crane handle angle is adjusted to 60°; the main and auxiliary hooks of the floating crane hang the guide tube support frame horizontally and motionlessly; the angle of the floating crane boom remains unchanged, the main hook begins to be slowly lowered, and the auxiliary hook is lifted synchronously, and during the process, the main hook is controlled to not exceed the main hook's weight in the horizontal hanging state; Step S132: When the lowering point does not enter the water, the auxiliary hook is continuously lifted and the main hook is lowered synchronously; the angle of the floating crane boom is kept unchanged during the turning process; Step S133: When the catheter support frame turns over to 90 degrees, the two upper hanging ropes on the main hook are both under force; the lower hanging rope on the main hook is loosened from the lower hanging point, and the auxiliary hook is slowly hooked to the top surface of the catheter support frame 2m above the water surface, and the wire rope at the lower hanging point is released.

6. The offshore hoisting, positioning and installation construction method of a large-scale conduit support frame according to claim 1 is characterized in that: In the step S20, the inclination of the top surface of the catheter support frame is checked, and the catheter support frame is leveled using the floating crane. During leveling, 2 to 3 support piles are placed on the bed. When leveling to the top surface level, the height difference of the four corners of the catheter support frame does not exceed 20 cm.

7. The offshore hoisting, positioning and installation construction method of a large-scale conduit support frame according to claim 1 is characterized in that: In step S20, after the catheter support frame is leveled to the top surface level by using the floating crane, the temporary connection plates of a pair of diagonal supporting piles are first released, and the supporting piles located at the diagonals are lowered. After the diagonal supporting piles are planted, the floating crane lifts the other two supporting piles, releases the temporary connection plates, lowers them, and starts the self-leveling mechanism, and uses the jacks of the self-leveling mechanism to counter-press the supporting piles into the rock.

8. The offshore hoisting, positioning and installation construction method of a large-scale conduit support frame according to claim 7 is characterized in that: When the self-leveling mechanism is started, the steps of tightening the upper nut, lifting with the jack, tightening the middle nut, and returning the oil with the jack are repeated until the supporting pile is stable and the middle nut is tightened. After all four supporting piles are stable, the floating hook is removed and the weight of the catheter support frame is transferred to the four supporting piles.

9. The offshore hoisting, positioning and installation construction method of a large-scale conduit support frame according to claim 1 is characterized in that: In the step S30, the positioning auxiliary piles in the unimplanted areas are preferentially inserted.

10. The offshore hoisting, positioning and installation construction method of a large-scale conduit support frame according to claim 1 is characterized in that: In step S40, each of the self-leveling mechanisms is removed in diagonal order; when removing the self-leveling mechanism, the steps are performed in sequence: loosen the top bolt 10 cm upward, lift with a jack, loosen the middle nut, return oil to the jack, loosen the upper nut, and remove the jack from top to bottom.

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