Manufacturing and mounting method of trailing suction pipe of trailing suction hopper dredger

Abstract

The invention relates to the technical field of ship assembly, and particularly discloses a method for manufacturing and installing a trailing suction pipe of a trailing suction hopper dredger, which comprises the following steps: S10, manufacturing the trailing suction pipe; s20, the rake suction pipe dock edge is assembled; s30, the suction pipe is installed on a suction pipe raking ship; wherein in the step S10, the step of manufacturing the drag suction pipe comprises the following steps: S11, manufacturing the drag suction pipe; s12, manufacturing a rotating mud pipe; s13, manufacturing a horizontal hinge; and S14, the cross hinge is manufactured. The assembly efficiency of the raking suction pipe can be effectively improved through manufacturing and mounting of all components of the raking suction pipe, such as manufacturing and mounting of a raking suction pipe, a rotating mud pipe, a horizontal hinge and a cross-shaped hinge, dock edge assembly of the raking suction pipe and ship mounting, meanwhile, the manufacturing period can be shortened by adopting sectional design assembly, and the production cost is reduced. The defects that an existing large drag suction dredger is low in efficiency and long in period are overcome, and therefore the building capacity of the large drag suction dredger is improved.

Description

Technical Field

[0001] The invention relates to the technical field of ship assembly, in particular to a method for manufacturing and installing a trailing suction pipe of a trailing suction dredger. Background Art

[0002] The existing large-scale trailing suction dredger's suction pipe welds need to be preheated before welding and need to be kept warm after welding, resulting in high precision requirements for the processing, production and installation of the suction pipes. In addition, all longitudinal and transverse butt welds are full penetration welds, and the installation process is difficult and technically demanding, resulting in strict requirements for the welding materials and processes of the suction pipes, and high control of the installation process. These directly affect the assembly efficiency and extend the manufacturing cycle. Summary of the invention

[0004] The technical problem to be solved by the present invention is: how to improve the assembly efficiency of the rake suction mud pipe and shorten the manufacturing cycle.

[0005] In order to solve the above technical problems, the present invention provides a method for manufacturing and installing a trailing suction pipe of a trailing suction dredger, comprising the following steps:

[0006] Raking straw making;

[0007] Assemble the rake suction pipe at the dockside;

[0008] Rake suction pipe installation on board;

[0009] The steps of making the rake suction pipe include:

[0010] Production of rake suction pipe;

[0011] Rotating mud tube production;

[0012] Horizontal hinge production;

[0013] Cross hinge production.

[0014] Further preferably, the steps of making the rake suction mud pipe include:

[0015] Pre-treat the steel plate on one side;

[0016] Cut and roll steel pipes according to the design drawing dimensions, open single-sided grooves as required, weld and connect them into sections;

[0017] When rolling each section of mud pipe, the adjacent steel pipes shall be staggered 180° in the longitudinal connection, the length of the transverse connecting pipe must be greater than 500mm, and the steel pipe staggered ≤0.5mm;

[0018] Rake suction pipe flange welding;

[0019] Carry out quality inspection on the suction pipe;

[0020] The qualified suction sludge pipe shall be sanded and painted with epoxy paint as required.

[0021] Further preferably, the step of welding the flange of the rake suction pipe includes:

[0022] Tighten the first flange and the second flange with bolts;

[0023] Put the suction pipe on the speed regulating rotating bracket, draw a cross line on the circumference of the suction pipe, insert the first flange, align the screw hole of the first flange with the cross line, and adjust the verticality between the end face of the first flange and the suction pipe to ensure that it is within 0.5mm;

[0024] Weld the first flange to the rake suction pipe by symmetrical intermittent welding, then adjust the rotation speed of the rotating bracket and weld the whole circle by automatic welding;

[0025] Draw a line between every two screw holes on the back of the first flange, weld the reinforcing rib plate, first weld the first flange and the reinforcing rib plate, then weld the rake suction pipe and the reinforcing rib plate;

[0026] The flange at the other end of the suction pipe is made according to the above method to ensure that the flange holes at both ends are in the same position without misalignment;

[0027] After the first flange and reinforcing rib plate are welded, the second flange is disassembled and an identification plate is attached to the suction pipe flange.

[0028] Further preferably, the step of performing quality inspection on the rake suction pipe comprises:

[0029] The maximum value of the outer diameter deviation and ovality of the suction pipe shall not exceed 3mm;

[0030] The verticality between the first flange plane and the suction pipe is ≤1mm;

[0031] The straightness of the suction pipe is ≤3mm; the length deviation of the suction pipe is ≤2mm;

[0032] All welds are submerged arc automatic welding, and the surface weld height is 1-2mm;

[0033] The welds of the suction pipe are ultrasonically tested and inspected according to the requirements of Class I welds.

[0034] Further preferably, the step of manufacturing the rotating mud tube includes:

[0035] Configure the outer sleeve and the inner sleeve, weld the rotating pipe flange and the concave-convex pipe to the two ends of the inner sleeve respectively, and perform fine processing;

[0036] Connect the first intermediate flange and the second intermediate flange to the rotating tube flange and the concave-convex tube respectively, and connect the connecting flange to the second intermediate flange to complete the preliminary assembly, check whether the rotating fit meets the requirements, and ensure that the gap between the concave-convex tube and the connecting flange is controlled within 5mm;

[0037] The two ends of the outer sleeve are respectively positioned and welded with the first middle flange and the second middle flange;

[0038] Disassemble the parts of the rotating sleeve and perform sandblasting and coating on the non-matching parts;

[0039] Clean the entire set of rotating tube fittings, apply butter, and assemble;

[0040] Carry out quality inspection on rotating mud pipe.

[0041] Further preferably, the step of performing quality inspection on the rotating mud pipe comprises:

[0042] The maximum value of the outer diameter deviation and ovality of the steel pipe shall not exceed 3mm;

[0043] The verticality between the flange plane and the pipe body is ≤1mm;

[0044] The straightness of the pipe body is ≤3mm; the length deviation of the pipe body is ≤2mm;

[0045] The gap between the concave and convex pipe and the connecting flange is ≤5mm.

[0046] Further preferably, the steps of manufacturing the horizontal hinge include:

[0047] Make and process dummy shafts with diameter of Φ169 at both ends, and process hinge arms, ear plates, elbows and flanges as required;

[0048] Adjust the two flanges to be parallel, then install the ear plates, install the false shafts on the ear plates at both ends, ensure that the two ear plates are parallel and the center distance is 2800mm, use a hanging hammer to ensure the verticality of the ear plate and the flange, and perform overall welding;

[0049] Boring of ear plates;

[0050] Protect the processed surfaces on the horizontal hinge and carry out sandblasting and coating;

[0051] Carry out quality inspection on horizontal hinges after installation.

[0052] Further preferably, the steps of making the cross hinge include:

[0053] Process the pin according to the drawing;

[0054] Clean all holes, sleeves and pins, apply butter, and insert all sleeves into the ear plates, making sure the end faces are flush;

[0055] Place the flange of the hinge arm flat on the platform with the ear plate facing upwards, install the cross ring and pin, and fix one end of the rubber tube to the flange plate of the hinge arm;

[0056] Lift the other hinge arm vertically, put it on the manual hoist, with the ear plate facing downward, adjust the manual hoist, align it with the shaft hole, install the pin shaft and the flanges at both ends of the rubber tube, and weld the stop block firmly;

[0057] After assembly, the cross hinge is quality inspected.

[0058] Further preferably, the step of assembling the rake suction pipe at the dockside includes:

[0059] Transport the rake suction mud pipe, rotating mud pipe, horizontal hinge and cross hinge to the dock side and place them at the designated location;

[0060] Use iron frames and sleepers as support for mud pipes;

[0061] Scrape off the stains and attachments on the flange end of the mud pipe, clean the surface, and evenly apply white ointment;

[0062] Connect the flanges of the suction pipe, rotating pipe, horizontal hinge and cross hinge with 8.8 grade high-strength bolts, and place flat gaskets and 8 grade nuts.

[0063] Further preferably, the step of installing the rake suction pipe on board comprises:

[0064] Mark the horizontal hinge line on the deck surface, and position two temporary brackets for rake pipes on the deck surface, and control the temporary brackets to be 1000mm away from the flange end faces of the first and second sections of the suction pipes, and complete the installation of the hangers for the rake head, middle and elbow at the same time;

[0065] In the dock, hang the whole rake suction pipe on the temporary support and the rake center and rake head hangers on the deck surface, and ensure that its end face is 300mm away from the horizontal hinge line, and fix it;

[0066] Configure the slider and position it in the elbow hanger, connect the horizontal hinge to the slider, and adjust it to a horizontal position with sleepers;

[0067] Lift the third section of the suction pipe of the rake suction pipe, and use a manual hoist to pull the first section of the suction pipe to connect it to the horizontal hinge end flange;

[0068] Hang a hemp rope vertically outside the pulleys of the middle and head hangers of the rake, determine the position of the rake suction pipe, mark the installation size of the lugs, and weld the lugs of the middle and head hangers of the rake;

[0069] Draw a cross line on the cross section flange of the suction pipe and the cross section flange of the rake head, lift the rake head, adjust the balance of the rake head, align the cross line and tighten it with 8.8 grade M42 bolts and double nuts according to the drawing;

[0070] Quality inspection is carried out after assembly.

[0071] Compared with the prior art, the method for manufacturing and installing the trailing suction pipe of a trailing suction dredger provided by the present invention has the following beneficial effects:

[0072] The present invention can effectively improve the assembly efficiency of the trailing suction pipe by manufacturing and installing various components of the trailing suction pipe, such as the trailing suction mud pipe, the rotating mud pipe, the horizontal hinge and the cross hinge, as well as the dockside assembly and on-board installation of the trailing suction pipe. At the same time, the use of segmented design and assembly can shorten the manufacturing cycle, thereby overcoming the defects of low efficiency and long cycle of existing large trailing suction dredgers, thereby improving the construction capacity of large trailing suction dredgers. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] Figure 1 The present invention is a flowchart of a method for manufacturing and installing a trailing suction pipe of a trailing suction dredger.

[0074] Figure 2 It is a step diagram of assembling the rake suction pipe at the dock side of the present invention.

[0075] Figure 3 It is a step diagram of installing the rake suction pipe on a ship according to the present invention.

[0076] Figure 4 It is a partial schematic diagram of the rake suction mud pipe of the present invention.

[0077] Figure 5 It is a structural schematic diagram of the rotating mud tube of the present invention.

[0078] Figure 6 It is a structural schematic diagram of the horizontal hinge described in the present invention.

[0079] Figure 7 It is a structural schematic diagram of the cross hinge described in the present invention.

[0080] Figure 8 It is a schematic structural diagram of the cross ring of the present invention.

[0081] Fig. 9 It is a demonstration diagram of the installation of the rake suction pipe on a ship according to the present invention.

[0082] Fig.10 It is a schematic diagram of the structure of the rake suction pipe after being installed on a ship according to the present invention.

[0083] Reference numerals:

[0084] 1. Mud pipe; 2. Second flange; 3. First flange; 4. Third weld; 5. Fourth weld; 6. First weld; 7. Second weld; 8. Inner sleeve; 9. Outer sleeve; 10. Rotating pipe flange; 11. First intermediate flange; 12. Second intermediate flange; 13. Concave-convex pipe; 14. Connecting flange; 15. Gap; 16. Sealing ring; 18. First hinge arm; 19. Flange; 20. First flange plate; 21. Ear plate; 22. Second hinge arm; 23. Bend pipe; 24. False shaft; 25. Second flange plate; 26. Third hinge arm; 27. Third flange plate; 28. Cross ring; 29. ​​Fourth hinge arm; 30. Lifting ear; 31. Temporary bracket; 32. Third section mud suction pipe; 33. Second section mud suction pipe; 34. Rotating mud pipe; 35. Cross hinge; 36. First section mud suction pipe; 37. Horizontal hinge. DETAILED DESCRIPTION

[0085] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0086] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like used in the present invention to indicate the orientation or position relationship is based on the orientation or position relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0087] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0088] In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0089] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0090] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0091] like Figure 1-Figure 10 As shown, this embodiment provides a method for manufacturing and installing a trailing suction pipe of a trailing suction dredger, comprising the following steps:

[0092] S10: Raking straw production;

[0093] S20: Assembling the suction pipe at the dockside;

[0094] S30: Raker suction pipe installed on board;

[0095] Wherein, in step S10, the steps of making the rake suction pipe include:

[0096] S11: Production of rake suction pipe;

[0097] S12: Rotating mud tube production;

[0098] S13: Horizontal hinge production;

[0099] S14: Cross hinge production.

[0100] Exemplarily, in step S11, the steps of making the rake suction pipe include:

[0101] S111: Pre-treat the steel plate on one side;

[0102] S112: Cut and roll steel pipes according to the design drawing dimensions, open single-sided grooves as required, weld and connect them into sections;

[0103] S113: When rolling each section of mud pipe, the adjacent steel pipes shall be staggered 180° in the longitudinal connection, the length of the transverse connecting pipe must be greater than 500mm, and the steel pipe staggered ≤0.5mm;

[0104] S114: flange welding of suction pipe;

[0105] S115: Conduct quality inspection on the suction pipe;

[0106] S116: The qualified suction slurry pipe shall be sanded and painted with epoxy paint as required.

[0107] Exemplarily, in step S114, the step of welding the flange of the rake suction pipe includes:

[0108] S1141: Tighten the first flange 3 and the second flange 2 with bolts;

[0109] S1142: Place the rake suction pipe 1 on the speed regulating rotating bracket, draw a cross line on the circumference of the rake suction pipe 1, insert the first flange 3, align the screw hole of the first flange 3 with the cross line, and adjust the verticality between the end face of the first flange 3 and the rake suction pipe 1 to ensure that it is within 0.5 mm;

[0110] S1143: Weld the first flange 3 to the rake suction pipe 1 by symmetrical intermittent welding, and then adjust the rotation speed of the rotating bracket to weld the entire circle by automatic welding;

[0111] S1144: Draw a line between every two screw holes on the back of the first flange 3, weld the reinforcing rib plate, first weld the first flange 3 and the reinforcing rib plate, and then weld the rake suction pipe 1 and the reinforcing rib plate;

[0112] S1145: The flange at the other end of the suction pipe is made according to the above method, ensuring that the flange holes at both ends are in the same position and not misaligned;

[0113] S1146: After the first flange 3 and the reinforcing rib plate are welded, the second flange 2 is disassembled and an identification plate is attached to the suction pipe flange.

[0114] For example, in step S1143, grooves are provided on the first flange 3 and the drag suction pipe 1 to facilitate welding and fixing of the first flange 3 and the drag suction pipe 1. The directions of the grooves of the first flange 3 and the drag suction pipe 1 and the first weld 6 and the second weld 7 between the first flange 3 and the drag suction pipe 1 are as follows: Figure 4 shown.

[0115] It should be noted that, considering the welding stress deformation, the first flange 3 and the reinforcing rib plate are welded first, and then the mud suction pipe 1 and the reinforcing rib plate are welded, that is, the third weld 4 is welded first, and then the fourth weld 5, the purpose of which is to reduce the deformation of the flange plane.

[0116] It should be noted that the lifting ears on all rake pipes should not be welded and must be welded after positioning on the ship.

[0117] Exemplarily, in step S115, the step of performing quality inspection on the rake suction pipe includes:

[0118] S1151: The maximum value of the outer diameter deviation and ovality of the suction pipe 1 shall not exceed 3mm;

[0119] S1152: The verticality between the plane of the first flange 3 and the rake suction pipe 1 is ≤1mm;

[0120] S1153: The straightness of the suction pipe 1 is ≤3mm; the length deviation of the suction pipe 1 is ≤2mm;

[0121] S1154: All welds are submerged arc automatic welding, and the surface weld height is 1-2mm;

[0122] S1155: The welds of the suction pipes are ultrasonically inspected and tested according to the requirements of Class I welds.

[0123] Specifically, in step S1154, the first weld 6, the second weld 7, the third weld 4 and the fourth weld 5 are all submerged arc automatic welding.

[0124] It should be noted that quality inspection is performed on the drag suction pipe 1 to ensure the installation accuracy of the drag suction pipe in subsequent dockside assembly and installation on board, thereby improving installation efficiency and shortening the manufacturing cycle.

[0125] Exemplarily, in step S12, the steps of manufacturing the rotating mud tube 34 include:

[0126] S121: Arrange the outer sleeve 9 and the inner sleeve 8, weld the rotating pipe flange 10 and the concave-convex pipe 13 to the two ends of the inner sleeve 8 respectively, and perform fine processing;

[0127] S122: Connect the first intermediate flange 11 and the second intermediate flange 12 to the rotating tube flange 10 and the concave-convex tube 13 respectively, and connect the connecting flange 14 to the second intermediate flange 12 to complete the preliminary assembly, check whether the rotation fit meets the requirements, and ensure that the gap 15 between the concave-convex tube 13 and the connecting flange 14 is controlled within 5 mm;

[0128] S123: Both ends of the outer sleeve 9 are respectively positioned and welded to the first middle flange 11 and the second middle flange 12;

[0129] S124: Disassemble the parts of the rotating sleeve and perform sandblasting and coating treatment on the non-matching parts;

[0130] S125: Clean the entire set of rotating tube fittings, apply butter, and assemble;

[0131] S126: Perform quality inspection on the rotating mud pipe.

[0132] In some examples, a sealing ring 16 is provided at the connection between the connecting flange 14 and the concave-convex tube 13 .

[0133] In the above example, the first middle flange 11, the second middle flange 12 and the rotating pipe flange 10 are all finely processed; the concave-convex tube 13 is roughly processed, with a 10 mm margin left at the stop fitting position, and is finely processed after being welded with the inner sleeve 8.

[0134] In the above example, after the initial assembly is completed, the burrs are cleaned, the bolts are tightened, and the rotational fit is checked to see if it rotates freely. The clearance between the concave-convex tube 13 and the connecting flange 14 is controlled within 5 mm to avoid eddy currents.

[0135] Exemplarily, in step S126, the step of performing quality inspection on the rotating mud pipe includes:

[0136] S1261: The maximum value of the outer diameter deviation and ovality of the steel pipe shall not exceed 3mm;

[0137] S1262: The verticality between the flange plane and the pipe body is ≤1mm;

[0138] S1263: Pipe body straightness ≤ 3mm; pipe body length deviation ≤ 2mm;

[0139] S1264: The gap between the concave and convex pipe and the connecting flange is ≤5mm.

[0140] It should be noted that quality inspection of the rotating mud pipe is carried out to ensure the installation accuracy of the rotating mud pipe in subsequent dockside assembly and installation on board, thereby improving installation efficiency and shortening the manufacturing cycle.

[0141] Exemplarily, the preparations before manufacturing the horizontal hinge 37 include: CNC cutting of the hinge arm plate part, processing of the ear plate, rough machining of the inner hole diameter, processing of the elbow and flange, and manufacturing of the tire frame for use.

[0142] Exemplarily, in step S13, the steps of manufacturing the horizontal hinge 37 include:

[0143] S131: Make and process a dummy shaft 24 with a diameter of Φ169 at both ends, and process hinge arms, ear plates, elbows and flanges as required;

[0144] S132: Adjust the two flanges to be parallel, then install the ear plate 21, install the dummy shaft 24 on both ends of the ear plates, ensure that the two ear plates are parallel and the center distance is 2800mm, use a hanging hammer to ensure the verticality of the ear plate and the flange, and perform overall welding;

[0145] S133: Ear plate boring;

[0146] S134: Protect the processed surfaces on the horizontal hinge and perform sandblasting and coating;

[0147] S135: Perform quality inspection on horizontal hinges after installation.

[0148] In the above example, the second hinge arm 22 is placed on the tire frame, adjusted to the level, and fixed with support welding; the first hinge arm 18 is connected to the second hinge arm 22. If the deviation of the connection clearance of the ear plate 21 is greater than 5mm, the ear plate 21 is corrected by pyrotechnics; the distance between the first hinge arm flange plate 20 and the second hinge arm flange plate 25 is ensured to be 3000mm, and the horizontal hinge is fixed with support and welded.

[0149] In the above example, the steps of boring the ear plate 21 include: placing the boring rod of the boring machine into the inner hole of the ear plate, and inserting the support sleeves at both ends; adjusting the center of the boring rod to coincide with the center of the inner hole of the ear plate, fixing the boring rod support sleeve, connecting the universal joint and the motor at the shaft end, and boring; the boring hole size is Ф190, and the interference with the outer diameter of the sleeve is 0.02-0.05mm.

[0150] In the above example, the pin is processed according to the drawing; the holes, sleeves and pins are cleaned and coated with butter, and the sleeves are inserted into the ear plates with the end faces flush; the flange of the first hinge arm is placed flat on the platform with the ear plate facing upward, and one end of the rubber tube is fixed to the flange plate of the first hinge arm; the second hinge arm is lifted vertically and mounted on the manual hoist with the ear plate facing downward, the manual hoist is adjusted to align with the axis hole of the ear plate, the pin and the flanges at both ends of the rubber tube are installed and connected, and the stop block is welded; the entire horizontal hinge is placed horizontally.

[0151] In the above example, the steps of quality inspection of the horizontal hinge 37 include: the maximum ovality of the ear plate shaft hole does not exceed 0.1; the verticality of the flange plane and the ear plate is ≤2mm; the horizontal hinge length deviation is ≤2mm; the gap deviation between the first ear plate and the second ear plate is ≤5mm.

[0152] Finally, the box body welds need to be ultrasonically inspected according to the requirements of Class I welds. This can ensure the installation accuracy of the horizontal hinge in the subsequent dockside assembly and installation on board, improve installation efficiency, and shorten the manufacturing cycle.

[0153] Exemplarily, in step S14, the steps of manufacturing the cross hinge 35 include:

[0154] S141: Process the pin according to the drawing;

[0155] S142: Clean all holes, sleeves and pins, apply butter, and insert all sleeves into the ear plates, making sure the end faces are flush;

[0156] S143: Place the flange of the hinge arm flat on the platform with the ear plate facing upward, install the cross ring 28 and the pin, and fix one end of the rubber tube to the flange plate of the hinge arm;

[0157] S144: Lift the other hinge arm vertically, put it on the manual hoist, with the ear plate facing downward, adjust the manual hoist, align it with the shaft hole, install the pin shaft and the flanges at both ends of the rubber tube, and weld the stop block;

[0158] S145: Perform quality inspection on cross hinges after assembly.

[0159] In the above example, the steps of making the cross hinge also include making the hinge arm and the cross ring 28, wherein the hinge arm making process is: adjust the two flanges to be parallel, then install the ear plates, install the dummy shafts on the ear plates at both ends, and ensure that the two ear plates are parallel and the center distance is 2800mm, and weld the whole; the cross ring making process is: divide the inner and outer rings of the cross ring into two sections, CNC cutting, pressing and forming, and beveling on both sides of the connection position; assemble and weld on the platform, and open the pin shaft hole by gas cutting.

[0160] In the above example, the cross hinge assembly process is as follows: put the first hinge arm 26 on the platform, adjust the level, and fix it with support welding; dock the third hinge arm 26 with the cross ring 28. If the ear plate docking gap deviation is greater than 5mm, the ear plate must be pyrotechnically adjusted; ensure that the third hinge arm 26 is fixed with the cross ring 28, fix it with support and weld it; for the fourth hinge arm 29, dock it with the slot of the cross ring in the same way, fix it with support and weld it. After assembly, protect the various processed surfaces on the cross hinge and perform sandblasting and painting.

[0161] The distance between the third flange plate 27 of the third hinge arm 26 and the dummy shaft is 1500 m.

[0162] Exemplarily, in step S145, the step of performing quality inspection on the cross hinge after assembly includes: the maximum ovality of the ear plate shaft hole does not exceed 0.1; the verticality of the flange plane and the ear plate is ≤2mm; the cross hinge length deviation is ≤2mm; the gap deviation between the ear plate and the cross ring groove is ≤5mm; the box body weld is subjected to ultrasonic flaw detection and inspected according to the requirements of Class I welds.

[0163] Exemplarily, in step S20, the step of assembling the rake suction pipe at the dock includes:

[0164] S21: transport the mud suction pipe 1, the rotating mud pipe 34, the horizontal hinge 35, and the cross hinge 37 to the dock side and place them at the designated position;

[0165] S22: Use iron frames and sleepers as mud pipe supports;

[0166] S23: Scrape off the stains and attachments on the flange end of the mud pipe, clean the surface, and evenly apply white ointment;

[0167] S24: Connect the flanges of the suction pipe, rotating pipe, horizontal hinge and cross hinge with 8.8 grade high-strength bolts, and place flat gaskets and 8 grade nuts.

[0168] Exemplarily, in step S30, the step of installing the trailing suction pipe on board includes:

[0169] S31: Carve a horizontal hinge line on the deck surface, and position two temporary brackets 31 for rake pipes on the deck surface, control the temporary brackets to be 1000mm away from the flange end faces of the first section of the mud suction pipe 36 and the second section of the mud suction pipe 33, and complete the installation of the rake head, rake middle, and elbow hangers at the same time;

[0170] S32: Hang the whole rake suction pipe on the temporary support and the rake center and rake head hangers on the deck in the dock, and ensure that its end face is 300mm away from the horizontal hinge line, and fix it;

[0171] S33: configure the slider, and position the slider in the elbow hanger, connect the horizontal hinge with the slider, and adjust it to be horizontal with sleepers;

[0172] S34: The third section of the suction pipe 32 of the rake suction pipe is hoisted, and the first section of the suction pipe 36 is pulled by a manual hoist to be connected to the horizontal hinge end face flange;

[0173] S35: vertically hang a hemp rope outside the pulleys of the middle hanger and the head hanger of the rake, determine the position of the rake suction pipe, mark the installation size of the lug according to the installation size of the lug, and weld the lugs of the middle hanger and the head hanger of the rake;

[0174] S36: Draw a cross line on the cross-section flange of the suction pipe and the cross-section flange of the rake head, lift the rake head, adjust the balance of the rake head, align the cross line, and tighten it with 8.8-grade M42 bolts and double nuts according to the drawings;

[0175] S37: Perform quality inspection after assembly.

[0176] Exemplarily, in order to facilitate the lifting of the mud suction pipe, a lifting lug 30 is provided on the outer wall of the mud suction pipe.

[0177] Exemplarily, in step S31, since the slider and the horizontal hinge cannot be installed in the dock, a line is drawn on the deck surface according to the theoretical size of the corresponding horizontal hinge end surface.

[0178] For example, in step S36, a 30t traveling crane is used to lift the rake head, adjust the balance of the rake head, and align the cross line for positioning. The flange has 42-φ45 holes, of which 30-φ45 are tightened with 8.8-grade M42 bolts and double nuts according to the drawings. The other 12 positioning pin holes are reamed, and the actual size is measured. The pin shaft is matched with an interference of 0.01mm, and the flange hole is driven in. The two ends are sealed with plates and welded. 12 sleeve bolts are put into the sleeve according to the drawings and tightened.

[0179] Exemplarily, in step S37, the step of performing quality inspection after assembly includes: all bolts must be tightened evenly; the entire rake pipe cannot be twisted; the gap outside the two flange planes is ≤1mm; the gap inside the flange is ≤0.2mm; the total length deviation is ≤50mm.

[0180] Exemplarily, flanges 19 and elbows 23 are provided at both ends of the horizontal hinge 37 to facilitate connection with the mud pipe. One end of the elbow 23 is connected to the cross hinge 37 , and one end of the flange 19 is connected to the second section mud suction pipe 33 .

[0181] In summary, the present invention provides a method for manufacturing and installing a trailing suction pipe of a trailing suction dredger, which can effectively improve the assembly efficiency of the trailing suction pipe by manufacturing and installing various components of the trailing suction pipe, such as the trailing suction mud pipe, the rotating mud pipe, the horizontal hinge and the cross hinge, as well as the dockside assembly and on-board installation of the trailing suction pipe. At the same time, the use of segmented design and assembly can shorten the manufacturing cycle, thereby overcoming the defects of low efficiency and long cycle of existing large trailing suction dredgers, thereby improving the construction capacity of large trailing suction dredgers.

[0182] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be regarded as the protection scope of the present invention. The basic principles, main features and advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above preferred embodiments. The embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention.

[0183] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for manufacturing and installing a trailing suction pipe of a trailing suction dredger, characterized in that: The following steps are involved: Raking straw making; Assemble the rake suction pipe at the dockside; Rake suction pipe installation on board; The steps of making the rake suction pipe include: Production of rake suction pipe; Rotating mud tube production; Horizontal hinge production; Cross hinge production.

2. The method for manufacturing and installing the trailing suction pipe of a trailing suction dredger according to claim 1, characterized in that: The steps of making the rake suction mud pipe include: Pre-treat the steel plate on one side; Cut and roll steel pipes according to the design drawing dimensions, open single-sided grooves as required, weld and connect them into sections; When rolling each section of mud pipe, the adjacent steel pipes shall be staggered 180° in the longitudinal joint, the length of the transverse connecting pipe must be greater than 500mm, and the steel pipe joint staggered ≤0.5mm; Rake suction pipe flange welding; Carry out quality inspection on the suction pipe; The qualified suction sludge pipe shall be sanded and painted with epoxy paint as required.

3. The method for manufacturing and installing the trailing suction pipe of a trailing suction dredger according to claim 2, characterized in that: The steps of welding the flange of the rake suction pipe include: Tighten the first flange and the second flange with bolts; Put the suction pipe on the speed regulating rotating bracket, draw a cross line on the circumference of the suction pipe, insert the first flange, align the screw hole of the first flange with the cross line, and adjust the verticality between the end face of the first flange and the suction pipe to ensure that it is within 0.5mm; Weld the first flange to the rake suction pipe by symmetrical intermittent welding, then adjust the rotation speed of the rotating bracket and weld the whole circle by automatic welding; Draw a line between every two screw holes on the back of the first flange, weld the reinforcing rib plate, first weld the first flange and the reinforcing rib plate, then weld the rake suction pipe and the reinforcing rib plate; The flange at the other end of the suction pipe is made according to the above method to ensure that the flange holes at both ends are in the same position without misalignment; After the first flange and reinforcing rib plate are welded, the second flange is disassembled and an identification plate is attached to the suction pipe flange.

4. The method for manufacturing and installing the trailing suction pipe of a trailing suction hopper dredger according to claim 2, characterized in that: The steps of quality inspection of the rake suction pipe include: The maximum value of the outer diameter deviation and ovality of the suction pipe shall not exceed 3mm; The verticality between the first flange plane and the suction pipe is ≤1mm; The straightness of the suction pipe is ≤3mm; the length deviation of the suction pipe is ≤2mm; All welds are submerged arc automatic welding, and the surface weld height is 1-2mm; The welds of the suction pipe are ultrasonically tested and inspected according to the requirements of Class I welds.

5. The method for manufacturing and installing the trailing suction pipe of a trailing suction dredger according to claim 1, characterized in that: The steps of making the rotating mud tube include: Configure the outer sleeve and the inner sleeve, weld the rotating pipe flange and the concave-convex pipe to the two ends of the inner sleeve respectively, and perform fine processing; Connect the first intermediate flange and the second intermediate flange to the rotating pipe flange and the concave-convex pipe respectively, and connect the connecting flange to the second intermediate flange to complete the preliminary assembly, check whether the rotating fit meets the requirements, and ensure that the gap between the concave-convex pipe and the connecting flange is controlled within 5mm; The two ends of the outer sleeve are respectively positioned and welded with the first middle flange and the second middle flange; Disassemble the parts of the rotating sleeve and perform sandblasting and coating on the non-matching parts; Clean the entire set of rotating tube fittings, apply butter, and assemble; Carry out quality inspection on rotating mud pipe.

6. The method for manufacturing and installing the trailing suction pipe of a trailing suction hopper dredger according to claim 5, characterized in that: The step of quality inspection of the rotating mud pipe comprises: The maximum value of the outer diameter deviation and ovality of the steel pipe shall not exceed 3mm; The verticality between the flange plane and the pipe body is ≤1mm; The straightness of the pipe body is ≤3mm; the length deviation of the pipe body is ≤2mm; The gap between the concave and convex pipe and the connecting flange is ≤5mm.

7. The method for manufacturing and installing the trailing suction pipe of a trailing suction hopper dredger according to claim 1, characterized in that: The steps of making the horizontal hinge include: Make and process dummy shafts with diameter of Φ169 at both ends, and process hinge arms, ear plates, elbows and flanges as required; Adjust the two flanges to be parallel, then install the ear plates, install the false shafts on the ear plates at both ends, ensure that the two ear plates are parallel and the center distance is 2800mm, use a hanging hammer to ensure the verticality of the ear plate and the flange, and perform overall welding; Boring of ear plates; Protect the processed surfaces on the horizontal hinge and carry out sandblasting and coating; Carry out quality inspection on horizontal hinges after installation.

8. The method for manufacturing and installing the trailing suction pipe of a trailing suction hopper dredger according to claim 1, characterized in that: The steps of making the cross hinge include: Process the pin according to the drawing; Clean all holes, sleeves and pins, apply butter, and insert all sleeves into the ear plates, making sure the end faces are flush; Place the flange of the hinge arm flat on the platform with the ear plate facing upwards, install the cross ring and pin, and fix one end of the rubber tube to the flange plate of the hinge arm; Lift the other hinge arm vertically, put it on the manual hoist, with the ear plate facing downward, adjust the manual hoist, align it with the shaft hole, install the pin shaft and the flanges at both ends of the rubber tube, and weld the stop block firmly; After assembly, the cross hinge is quality inspected.

9. The method for manufacturing and installing the trailing suction pipe of a trailing suction hopper dredger according to claim 1, characterized in that: The steps of assembling the rake suction pipe at the dockside include: Transport the rake suction mud pipe, rotating mud pipe, horizontal hinge and cross hinge to the dock side and place them at the designated location; Use iron frames and sleepers as support for mud pipes; Scrape off the stains and attachments on the flange end of the mud pipe, clean the surface, and evenly apply white ointment; Connect the flanges of the suction pipe, rotating pipe, horizontal hinge and cross hinge with 8.8 grade high-strength bolts, and place flat gaskets and 8 grade nuts.

10. The method for manufacturing and installing the trailing suction pipe of a trailing suction hopper dredger according to claim 1, characterized in that: The steps of installing the rake suction pipe on board include: Mark the horizontal hinge line on the deck surface, and position two temporary brackets for rake pipes on the deck surface, and control the temporary brackets to be 1000mm away from the flange end faces of the first and second sections of the suction pipes, and complete the installation of the hangers for the rake head, middle and elbow at the same time; In the dock, hang the whole rake suction pipe on the temporary support and the rake center and rake head hangers on the deck surface, and ensure that its end face is 300mm away from the horizontal hinge line, and fix it; Configure the slider and position it in the elbow hanger, connect the horizontal hinge to the slider, and adjust it to a horizontal position with sleepers; Lift the third section of the suction pipe of the rake suction pipe, and use a manual hoist to pull the first section of the suction pipe to connect it to the horizontal hinge end flange; Hang a hemp rope vertically outside the pulleys of the middle and head hangers of the rake, determine the position of the rake suction pipe, mark the installation size of the lugs, and weld the lugs of the middle and head hangers of the rake; Draw a cross line on the cross section flange of the suction pipe and the cross section flange of the rake head, lift the rake head, adjust the balance of the rake head, align the cross line and tighten it with 8.8 grade M42 bolts and double nuts according to the drawing; Quality inspection is carried out after assembly.

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