A rake pipe length adjustment system and method for a trailing suction hopper dredger

Abstract

The present invention belongs to the field of trailing suction hopper dredgers, and particularly relates to a rake pipe length adjustment system and method for a trailing suction hopper dredger. The system includes a guide rail that extends from an initial position to a target position. The guide rail includes a hanger displacement guide rail and a drag head displacement guide rail; a jacking mechanism including a first jack for jacking up the drag head hanger and a second jack for jacking up the drag head; a translation mechanism including a first moving trolley disposed below the drag head hanger and a second moving trolley disposed below the drag head. The first moving trolley can move along the hanger displacement guide rail, and the second moving trolley can move along the drag head displacement guide rail; a power mechanism connected to the translation mechanism, and the power mechanism is used to push the translation mechanism to move on the guide rail. The present invention can achieve the displacement of the drag head mechanism and the drag head hanger on the deck of the trailing suction hopper dredger to carry out the construction of lengthening and shortening the rake pipe, and has the advantages of simple and easy operation, convenient and fast construction, short construction period and low construction cost.

Description

Technical Field

[0001] The present invention belongs to the field of trailing suction hopper dredgers, and particularly relates to a rake pipe length adjustment system and method for a trailing suction hopper dredger. Background Art

[0002] During the channel dredging process, since the channel grades are different and the dredging depths required are also different, the trailing suction hopper dredger needs to change the length of the rake pipe to adapt to different dredging depth requirements. Generally, to change the length of the rake pipe, the suction pipe between the rake head hanger and the middle rake hanger is disconnected, and then a section of suction pipe is added or shortened. The high-pressure flushing water pipe, hydraulic pipe, vacuum pipe, sensor cable, etc. are also added or shortened synchronously, and the rake head hanger and the rake head support rod are displaced accordingly, so as to achieve adapting to different dredging depth requirements by changing the length of the rake pipe.

[0003] There are two conventional systems and methods for changing the length of the rake pipe. One is to use a quay crane. The trailing suction hopper dredger looks for a nearby quay to dock, and uses the quay crane corresponding to the tonnage of the rake head hanger on the quay. Before lengthening or shortening the rake pipe, at the initial position, the rake head mechanism, rake pipe, and rake head hanger are disassembled, and then they are hoisted down one by one. After completion of lengthening or shortening, they are hoisted onto the target position of the trailing suction hopper dredger one by one for installation. The other is to rent a floating crane. The trailing suction hopper dredger looks for a sheltered anchorage. The floating crane anchors and positions on one side of the trailing suction hopper dredger. The rake head mechanism, rake pipe, and rake head hanger are disassembled, and then they are hoisted down one by one. After completion of lengthening or shortening, they are hoisted onto one side of the trailing suction hopper dredger one by one for installation; if the span and height of the floating crane are sufficient, the rake head mechanisms, rake pipes, and rake head hangers on the left and right sides of the trailing suction hopper dredger can be hoisted on the same side, but when hoisting the opposite side, the operator cannot see the object landing position. If the span and height of the floating crane are not enough, the floating crane needs to move to the other side of the trailing suction hopper dredger to anchor and position before hoisting.

[0004] The tonnage and stroke of the self - carried crane on the trailing suction hopper dredger are insufficient, and it is impossible to use its own equipment and personnel to realize the construction of lengthening and shortening the rake pipe. Using a floating crane or a quay crane has limitations. It is necessary to find a suitable floating crane, quay crane, and quay, and it is impossible to realize the construction of lengthening and shortening the rake pipe in time. At the same time, there are also disadvantages of long construction period and high construction cost.

[0005] Therefore, there is an urgent need for a rake pipe length adjustment system and method for a trailing suction hopper dredger that is simple to operate, convenient and fast, and low in cost. Summary of the Invention

[0006] The purpose of the present invention is to provide a rake pipe length adjustment system and method for a trailing suction hopper dredger aiming at the deficiencies of the prior art, which can realize displacing the rake head mechanism and the rake head hanger on the deck of the trailing suction hopper dredger to carry out the construction of lengthening and shortening the rake pipe, and has the advantages of simple and easy operation, convenient and fast construction, short construction period, and low construction cost.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A pipe length adjustment system for a trailing suction hopper dredger, which is used to move the draghead hanger and the draghead mechanism from an initial position to a target position, comprising:

[0009] A guide rail arranged on the deck, the guide rail extending from the initial position to the target position, the guide rail including a hanger displacement guide rail and a draghead displacement guide rail, the hanger displacement guide rail being arranged below the draghead hanger, and the draghead displacement guide rail being arranged below the draghead of the draghead mechanism;

[0010] A jacking mechanism, the jacking mechanism including a first jack for jacking up the draghead hanger and a second jack for jacking up the draghead;

[0011] A translation mechanism, the translation mechanism including a first moving trolley arranged below the draghead hanger and a second moving trolley arranged below the draghead, the first moving trolley being capable of moving along the length extension direction of the hanger displacement guide rail, and the second moving trolley being capable of moving along the length extension direction of the draghead displacement guide rail;

[0012] A power mechanism connected to the translation mechanism, the power mechanism being used to push the translation mechanism to move on the guide rail.

[0013] Further, the first jack and the second jack are 100-ton double-acting hydraulic jacks. There are two first jacks, which are respectively supported under the two trunnions of the draghead hanger. The second jack is placed below the draghead, and a first steel pipe is further arranged between the draghead and the second jack, and the first steel pipe supports the draghead.

[0014] Further, the jacking mechanism further includes a third jack. The third jack is a 50-ton double-acting hydraulic jack, and the third jack is supported at the fixed-end trunnion of the outer support hydraulic cylinder of the draghead hanger.

[0015] Further, the power mechanism drives the second moving trolley to move along the length extension direction of the draghead displacement guide rail by means of a transmission chain drive mode or a transmission belt drive mode or a hydraulic cylinder drive mode or an electric telescopic rod drive mode.

[0016] Further, the power mechanism is a walking hydraulic cylinder.

[0017] The present invention also provides a method for adjusting the pipe length of a trailing suction hopper dredger. The method uses the pipe length adjustment system of a trailing suction hopper dredger as described above. The method includes:

[0018] Laying the guide rail: Lay the guide rail under the draghead hanger and the draghead on the deck;

[0019] Load transfer: Use the jacking mechanism to transfer the entire draghead hanger and the draghead mechanism to the translation mechanism placed on the guide rail;

[0020] Integral translation: Install the power mechanism and translate the draghead hanger and the draghead mechanism to the target position by dragging and / or pushing the translation mechanism;

[0021] Positioning on the deck: Use the jacking mechanism to lift the entire draghead hanger and the draghead mechanism and position them on the deck, and withdraw the translation mechanism;

[0022] Draghead pipe connection: Connect the draghead mud pipe and the middle draghead mud pipe, and adjust the length of the draghead pipe by installing or removing the extension mud pipe between the draghead mud pipe and the middle draghead mud pipe.

[0023] Furthermore, the load transfer step includes:

[0024] Initial position jacking: Two first jacks are respectively supported under the two trunnions of the draghead hanger, the second jack is placed under the draghead and supports the draghead through the first steel pipe. There is also a third jack arranged at the trunnion of the fixed end of the outer support hydraulic cylinder of the draghead hanger. The first jack, the second jack and the third jack cooperate to lift the entire draghead hanger and the draghead mechanism;

[0025] Placing the translation mechanism: Place the first moving trolley under the base of the draghead hanger and place the second moving trolley under the draghead;

[0026] Initial position lowering: The jacking mechanism lowers the entire draghead hanger and the draghead mechanism, transfers the load of the draghead hanger base to the first moving trolley, transfers the load of the draghead to the second moving trolley, and withdraws the jacking mechanism.

[0027] Furthermore, the integral translation step includes a dragging state and a pushing state:

[0028] Dragging state: When the telescopic rod of the power mechanism is in the extended state, install the power mechanism on the deck and connect it to the first end of the first moving trolley. During the retraction process of the telescopic rod of the power mechanism, drag the first moving trolley to move on the guide rail towards the target position;

[0029] Pushing state: When the telescopic rod of the power mechanism is in the retracted state, install the power mechanism on the deck and connect it to the second end of the first moving trolley. During the extension process of the telescopic rod of the power mechanism, push the first moving trolley to move on the guide rail towards the target position;

[0030] The integral translation step is cycled in sequence by the dragging state and the pushing state until the first moving trolley is translated to the target position.

[0031] Further, the step of positioning on the deck includes:

[0032] Lifting at the target position: Two first jacks are respectively supported under the two trunnions of the draghead hanger, the second jack is placed under the draghead and supports the draghead through the first steel pipe. There is also a third jack arranged at the trunnion of the fixed end of the external support hydraulic cylinder of the draghead hanger. The first jack, the second jack and the third jack cooperate to lift the whole draghead hanger and the draghead mechanism;

[0033] Withdrawing the translation mechanism: Withdraw the first moving trolley and the second moving trolley from the guide rail;

[0034] Lowering at the target position: The lifting mechanism lowers the whole draghead hanger and the draghead mechanism, positions and fixes the base of the draghead hanger on the deck, sets up a support rod under the draghead to support the draghead, and withdraws the lifting mechanism.

[0035] Further, before the step of laying the guide rail, there is also preparation before moving, and after the step of positioning on the deck, there is also post-treatment after moving;

[0036] The preparation before moving includes:

[0037] Adjusting the ballast: Adjust the ballast of the trailing suction hopper dredger to make the longitudinal inclination and transverse inclination of the trailing suction hopper dredger zero;

[0038] Sealing and welding for fixation: Seal and weld the draghead hanger and the draghead mechanism, seal and weld the draghead, the rotary joint and the draghead mud pipe of the draghead mechanism to form an integral whole between the draghead hanger and the draghead mechanism;

[0039] Disconnecting the drag pipe: Disassemble the hoisting wire of the draghead, disconnect the connection between the draghead mud pipe and the middle drag pipe, disassemble the hydraulic pipe, and disassemble the bolts of the base of the draghead hanger;

[0040] The post-treatment after moving includes:

[0041] Removing: Remove the power mechanism and the guide rail;

[0042] Cleaning: Clean the welding slag and dust, and apply grease;

[0043] Installing: Install the bolts of the base of the draghead hanger.

[0044] Advantages of the present invention:

[0045] 1. Simple and easy to operate: It does not require a wharf, mobilization, external lifting machinery and manpower support. It can completely use the equipment and personnel of the trailing suction hopper dredger to complete all the work of lengthening and shortening the drag pipe of the ship.

[0046] 2. Simple construction procedure: The equipment and materials can be taken out and used immediately without external support. It can complete the erection of the guide rail and the displacement of the draghead hanger and the draghead mechanism on the deck of the trailing suction hopper dredger.

[0047] 3. Obvious economic benefits: Compared with the traditional method of using dock tower cranes or renting floating cranes, the construction period of the present invention is short, the construction cost is low, and the equipment and materials invested during the construction process can be reused as special tools once and for all. Description of the Drawings

[0048] Attached Figure 1 is a partial structural schematic diagram of the trailing suction hopper dredger of the present invention;

[0049] Attached Figure 2 is a structural schematic diagram of the guide rail of the present invention;

[0050] Attached Figure 3 is a structural schematic diagram of the draghead hanger and the draghead mechanism of the present invention;

[0051] Attached Figure 4 is a structural schematic diagram of the jacking mechanism supporting the draghead hanger and the draghead of the present invention;

[0052] Attached Figure 5 is a structural schematic diagram of the translation mechanism carrying the draghead hanger and the draghead of the present invention;

[0053] Attached Figure 6 is a structural schematic diagram of the power mechanism in the dragging state of the present invention;

[0054] Attached Figure 7 is a structural schematic diagram of the power mechanism in the pushing state of the present invention;

[0055] Attached Figure 8 is a flow chart of the method of the present invention;

[0056] Attached Figure 9 is a flow chart of the method of the present invention;

[0057] Attached Figure 10 is a flow chart of the pre-shift preparation step of the method of the present invention;

[0058] Attached Figure 11 is a flow chart of the load transfer step of the method of the present invention;

[0059] Attached Figure 12 is a flow chart of the overall translation step of the method of the present invention;

[0060] Attached Figure 13 is a flow chart of the landing on deck step of the method of the present invention;

[0061] Attached Figure 14 is a flow chart of the post-shift processing step of the method of the present invention;

[0062] Identifications in the figure: 1 - Rake head hanger; 2 - Rake head mechanism, 210 - Rake head, 220 - Rotary joint, 230 - Rake head mud pipe; 3 - Initial position; 4 - Target position; 5 - Guide rail, 510 - Hanger displacement guide rail, 520 - Rake head displacement guide rail; 6 - Jacking mechanism, 610 - First jack, 620 - Second jack, 630 - Third jack; 7 - Translation mechanism, 710 - First moving trolley, 720 - Second moving trolley; 8 - Power mechanism; 9 - Middle rake mud pipe; 10 - First steel pipe; 11 - Support rod; 12 - Rake head lifting wire; 13 - Middle rake hanger; 14 - Stern platform; 15 - Initial dredging depth; 16 - Target dredging depth; 17 - Second steel pipe. Embodiment

[0063] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0064] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are 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 thus should not be construed as limiting the present invention.

[0065] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0066] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] Refer to the attached Figure 1 to the attachedFigure 14 , which shows a specific embodiment of a rake pipe length adjustment system and method provided by the present invention for a trailing suction hopper dredger. Embodiment

[0068] Refer to the appendix Figure 1 to the appendix Figure 7 , this embodiment provides a rake pipe length adjustment system for a trailing suction hopper dredger, which is used to move the rake head hanger 1 and the rake head mechanism 2 from the initial position 3 to the target position 4, including:

[0069] A guide rail 5 provided on the deck, the guide rail 5 extends from the initial position 3 to the target position 4, and the guide rail 5 includes a hanger displacement guide rail 510 and a rake head displacement guide rail 520. The hanger displacement guide rail 510 is provided below the rake head hanger 1, and the rake head displacement guide rail 520 is provided below the rake head 210 of the rake head mechanism 2;

[0070] A jacking mechanism 6, the jacking mechanism 6 includes a first jack 610 for jacking up the rake head hanger 1 and a second jack 620 for jacking up the rake head 210;

[0071] A translation mechanism 7, the translation mechanism 7 includes a first moving trolley 710 provided below the rake head hanger 1 and a second moving trolley 720 provided below the rake head 210. The first moving trolley 710 can move along the length extension direction of the hanger displacement guide rail 510, and the second moving trolley 720 can move along the length extension direction of the rake head displacement guide rail 520;

[0072] A power mechanism 8 connected to the translation mechanism 7, and the power mechanism 8 is used to push the translation mechanism 7 to move on the guide rail 5.

[0073] Refer to the appendix Figure 1 and the appendix Figure 2, in the above embodiment, the dragline length adjustment system is mainly used to move the draghead hanger 1 and the draghead mechanism 2 from the initial position 3 to the target position 4. Among them, the initial position 3 is the position before moving the draghead hanger 1 and the draghead mechanism 2. When it is necessary to extend the dragline, the target position 4 is between the initial position 3 and the stern platform 14. When it is necessary to shorten the dragline, the target position 4 is between the initial position 3 and the mid-drag hanger 13. Before using this system, first disconnect the dragline between the draghead hanger 1 and the mid-drag hanger 13, then use this system to move the draghead hanger 1 and the draghead mechanism 2 to the target position, and finally reconnect the dragline between the draghead hanger 1 and the mid-drag hanger 13. The guide rail 5 is used for guiding, facilitating the sliding of the translation mechanism 7. The lifting mechanism 6 is used to lift and transfer the draghead hanger 1 and the draghead mechanism 2 onto the translation mechanism 7. The translation mechanism 7 moves towards the target position 4 under the power support of the power mechanism 8. After reaching the target position, the lifting mechanism 6 lifts and transfers the draghead hanger 1 and the draghead mechanism 2 onto the deck, that is, the displacement work of the draghead hanger 1 and the draghead mechanism 2 is completed. Then, only by reconnecting the dragline between the draghead hanger 1 and the mid-drag hanger 13 can the adjustment of the dragline length be completed, without the need for a dock, dispatch, external lifting machinery, and human support, saving time and effort, and being convenient and fast. Refer to the appendix Figure 1 , after the draghead hanger 1 moves from the initial position 3 to the target position 4, when the trailing suction hopper dredger is under construction, the draghead 210 increases from the initial dredging depth 15 to the target dredging depth 16, so as to achieve the purpose of increasing the dredging depth.

[0074] Refer to the appendix Figure 4 and the appendix Figure 5 , in the above embodiment, the first jack 610 and the second jack 620 are 100-ton double-acting hydraulic jacks. There are two first jacks 610, which are respectively supported under the two trunnions of the draghead hanger 1. The second jack 620 is placed under the draghead 210. A first steel pipe 10 is also provided between the draghead 210 and the second jack 620, and the first steel pipe 10 supports the draghead 210. Specifically, the draghead mechanism 2 includes a draghead 210, a swivel joint 220, and a draghead mud pipe 230. The draghead mechanism 2 is arranged on the draghead hanger 1. Since the draghead 210 is relatively heavy, a support rod 11 is also provided under the draghead 210, as shown in the appendix Figure 3 . Similarly, when using the lifting mechanism 6 to lift the draghead hanger 1, it is also necessary to set the second jack 620 under the draghead 210 to synchronously lift the draghead 210. In the embodiment, in order to ensure the stability of the draghead hanger 1 during lifting, the lifting mechanism 6 further includes a third jack 630. The third jack 630 is a 50-ton double-acting hydraulic jack, and the third jack 630 is supported at the trunnion of the fixed end of the outer support hydraulic cylinder of the draghead hanger 1.

[0075] Refer to the appendix Figure 6 and the appendix Figure 7, in the above embodiment, the power mechanism 8 can move the translation mechanism 7 in one or more of the ways of chain drive, belt drive, hydraulic cylinder drive, and electric telescopic rod drive, and move the translation mechanism to the target position 4 by pushing or dragging the second moving trolley 720 along the length extension direction of the drag head displacement guide rail 520. In this embodiment, the power mechanism 8 is a walking hydraulic cylinder. Embodiment

[0076] Refer to Appendix Figure 8 to Appendix Figure 14 , this embodiment provides a method for adjusting the length of the drag pipe of a trailing suction hopper dredger. This method uses the above-mentioned system for adjusting the length of the drag pipe of the trailing suction hopper dredger. Refer to Appendix Figure 8 , this method includes the following steps:

[0077] Step S100, laying the guide rail: Lay the guide rail 5 under the drag head hanger 1 and the drag head 210 on the deck;

[0078] Step S200, load transfer: Use the lifting mechanism 6 to transfer the drag head hanger 1 and the drag head mechanism 2 as a whole to the translation mechanism 7 placed on the guide rail 5;

[0079] Step S300, overall translation: Install the power mechanism 8, and translate the drag head hanger 1 and the drag head mechanism 2 to the target position 4 by dragging and / or pushing the translation mechanism 7;

[0080] Step S400, landing on the deck: Use the lifting mechanism 6 to lift the drag head hanger 1 and the drag head mechanism 2 as a whole and land them on the deck, and withdraw the translation mechanism 7;

[0081] Step S500, drag pipe connection: Connect the drag head mud pipe 230 and the middle drag pipe 9, and adjust the length of the drag pipe by installing or removing the extension mud pipe between the drag head mud pipe 230 and the middle drag pipe 9.

[0082] Refer to Appendix Figure 11 , in the above embodiment, the load transfer step S200 includes:

[0083] Step S210, initial position jacking: Two first jacks 610 are respectively supported under the two trunnions of the drag head hanger 1, the second jack 620 is placed under the drag head 210 and supports the drag head 210 through the first steel pipe 10. It also includes a third jack 630 arranged at the trunnion of the fixed end of the outer support hydraulic cylinder of the drag head hanger 1. The first jack 610, the second jack 620, and the third jack 630 cooperate to lift the drag head hanger 1 and the drag head mechanism 2 as a whole;

[0084] Step S220, placing the translation mechanism: Place the first moving trolley 710 under the base of the draghead hanger 1, and place the second moving trolley 720 under the draghead 210;

[0085] Step S230, lowering at the initial position: The lifting mechanism 6 lowers the draghead hanger 1 and the draghead mechanism 2 as a whole, transfers the load of the base of the draghead hanger 1 to the first moving trolley 710, transfers the load of the draghead 210 to the second moving trolley 720, and withdraws the lifting mechanism 6.

[0086] Refer to the appendix Figure 12 , in the above embodiment, the overall translation step S300 includes a dragging state and a pushing state:

[0087] Step S310, dragging state: When the telescopic rod of the power mechanism 8 is in the extended state, install the power mechanism 8 on the deck and connect it to the first end of the first moving trolley 710. During the retraction process of the telescopic rod of the power mechanism 8, drag the first moving trolley 710 to move on the guide rail 5 towards the target position 4;

[0088] Step S320, pushing state: When the telescopic rod of the power mechanism 8 is in the retracted state, install the power mechanism 8 on the deck and connect it to the second end of the first moving trolley 710. During the extension process of the telescopic rod of the power mechanism 8, push the first moving trolley 710 to move on the guide rail 5 towards the target position 4;

[0089] The overall translation step S300 is sequentially cycled between the dragging state S310 and the pushing state S320 until the first moving trolley 710 is translated to the target position 4.

[0090] Refer to the appendix Figure 13 , in the above embodiment, the step S400 of landing on the deck includes:

[0091] Step S410, jacking at the target position: Two first jacks 610 are respectively supported under the two trunnions of the draghead hanger 1, the second jack 620 is placed under the draghead 210 and supports the draghead 210 through the first steel pipe 10. There is also a third jack 630 arranged at the trunnion of the fixed end of the outer support hydraulic cylinder of the draghead hanger 1. The first jack 610, the second jack 620 and the third jack 630 cooperate to jack up the draghead hanger 1 and the draghead mechanism 2 as a whole;

[0092] Step S420, withdrawing the translation mechanism: Withdraw the first moving trolley 710 and the second moving trolley 720 from the guide rail 5;

[0093] Step S430, lowering at the target position: The lifting mechanism 6 lowers the draghead hanger 1 and the draghead mechanism 2 as a whole, fixes the base of the draghead hanger 1 on the deck, sets a support rod 11 under the draghead 210 to support the draghead 210, and withdraws the lifting mechanism 6.

[0094] In the above embodiments, before the step S100 of laying the guide rail, there is also a pre-movement preparation step SA0, and after the step of positioning on the deck, there is also a post-movement treatment step SB0;

[0095] Refer to the appendix Figure 10 , the pre-movement preparation step SA0 includes:

[0096] Step SA1, adjusting the ballast: Adjust the ballast of the trailing suction hopper dredger so that the longitudinal and transverse inclinations of the trailing suction hopper dredger are zero;

[0097] Step SA2, sealing and fixing: Seal and weld the drag head hanger 1 and the drag head mechanism 2, and seal and weld the drag head 210, the rotary joint 220 and the drag head mud pipe 230 of the drag head mechanism 2 to form an integral body between the drag head hanger 1 and the drag head mechanism 2;

[0098] Step SA3, disconnecting the drag pipe: Disassemble the drag head lifting wire 12, disconnect the connection between the drag head mud pipe 230 and the middle drag pipe 9, disassemble the hydraulic pipe, and disassemble the base bolts of the drag head hanger 1;

[0099] Refer to the appendix Figure 14 , the post-movement treatment step SB0 includes:

[0100] Step SB1, removing: Remove the power mechanism 8 and the guide rail 5;

[0101] Step SB2, cleaning: Clean the welding slag and dust, and apply grease;

[0102] Step SB3, installing: Install the base bolts of the drag head hanger 1. Embodiment

[0103] Refer to the appendix Figure 9 , as a more specific embodiment, this embodiment provides a specific construction process of a method for adjusting the length of the drag pipe of a trailing suction hopper dredger, and the construction process is as follows:

[0104] Step SA0, refer to the appendix Figure 10 , pre-movement preparation:

[0105] Step SA1, adjusting the ballast: Adjust the loading amount of the fore-and-aft and left-and-right ballast tanks of the trailing suction hopper dredger so that the main deck of the ship is in a horizontal state, that is, the longitudinal and transverse inclinations of the trailing suction hopper dredger are zero;

[0106] Step SA2, sealing and fixing: Seal and fix the draghead hanger 1 and the draghead mechanism 2, and seal and weld the draghead 210, the rotary joint 220 and the draghead mud pipe 230 of the draghead mechanism 2, so as to form an integral body between the draghead hanger 1 and the draghead mechanism 2; Specifically, use angle steel to weld and fix the draghead hanger 1 and the draghead mud pipe 230 into one body. The draghead mechanism 2 includes a draghead 210, a rotary joint 220 and a draghead mud pipe 230. In order to prevent relative movement between the draghead 210 and the draghead mud pipe 230 during subsequent movement, seal and fix the rotary joint 220 with a steel plate, and then use angle steel to weld and fix between the hydraulic cylinder ear plate and the base ear plate of the draghead hanger 1. A support rod 11 is arranged below the draghead 210 to support the draghead 210;

[0107] Step SA3, disconnect the drag pipes: Rotate the draghead winch to release the draghead lifting wire 12, remove the wedge joint, and pull out the draghead lifting wire 12 from the wedge joint, so as to complete the disassembly work of the draghead lifting wire 12; Disassemble the drag pipe bolts, disconnect the connection between the draghead mud pipe 230 and the middle drag pipe 9, disassemble the high-pressure flushing water pipe bolts and disconnect the high-pressure flushing water pipe, disassemble the power draghead hydraulic pipe, disassemble the hydraulic cylinder oil pipe of the draghead hanger 1, and use special plugs to block the above pipelines. Disassemble the base bolts of the draghead hanger 1;

[0108] In the embodiment, there is no sequence between step SA2 and step SA3, and there is no sequence between the respective sub-steps in step SA2 and step SA3, and they can be carried out alternately, which has no influence on the pre-movement preparation step SA0.

[0109] Step S100, lay the guide rails: Lay the guide rails 5 under the draghead hanger 1 and the draghead 210 on the deck, and spot weld and reinforce after laying; In the embodiment, the guide rails 5 include a hanger displacement guide rail 510 and a draghead displacement guide rail 520. The hanger displacement guide rail 510 is arranged outside the periphery of the draghead hanger 1, and the draghead displacement guide rail 520 is arranged under the draghead 210 of the draghead mechanism 2; In the embodiment, the guide rails 5 are erected by T-shaped steel plates, and positioning angle steel is spot welded at positions such as on the guide rails 5, the initial position 3, and the target position 4 for positioning.

[0110] Step S200, refer to the appendix Figure 11 , load transfer: Use the lifting mechanism 6 to transfer the draghead hanger 1 and the draghead mechanism 2 as a whole to the translation mechanism 7 placed on the guide rails 5, including:

[0111] Step S210, Jacking at the initial position: In the embodiment, the jacking mechanism 6 includes two first jacks 610, one second jack 620 and one third jack 630. The first jack 610 and the second jack 620 are 100-ton double-acting hydraulic jacks, and the third jack 630 is a 50-ton double-acting hydraulic jack. The two first jacks 610 are respectively supported under the two trunnions of the draghead hanger 1, the third jack 630 is supported at the trunnion of the fixed end of the outer support hydraulic cylinder of the draghead hanger 1 for assistance, the second jack 620 is placed under the draghead 210 and supports the draghead 210 through the first steel pipe 10. The first jack 610, the second jack 620 and the third jack 630 cooperate to jack up the draghead hanger 1 and the draghead mechanism 2 as a whole.

[0112] Step S220, Install the translation mechanism: Place the first moving trolley 710 under the base of the draghead hanger 1, and place the second moving trolley 720 under the draghead 210. The first moving trolley 710 is located on the hanger displacement guide rail 510, and the second moving trolley 720 is located on the draghead displacement guide rail 520.

[0113] Step S230, Lowering at the initial position: The first jack 610, the second jack 620 and the third jack 630 lower the draghead hanger 1 and the draghead mechanism 2 as a whole, transfer the load of the base of the draghead hanger 1 to the first moving trolley 710, transfer the load of the draghead 210 to the second moving trolley 720, and remove the jacking mechanism 6. In the embodiment, a second steel pipe 17 is supported between the draghead 210 and the second moving trolley 720.

[0114] Step S300, Refer to the appendix Figure 12 , Overall translation: Install the power mechanism 8, and translate the draghead hanger 1 and the draghead mechanism 2 to the target position 4 by dragging and / or pushing the translation mechanism 7. Before installing the power mechanism 8, first connect the oil pipes of the walking hydraulic cylinder of the power mechanism 8. The walking hydraulic cylinder is placed horizontally, and the inlet and outlet oil pipes are vertically upward. Let the walking hydraulic cylinder reciprocate two full strokes with an empty stroke to ensure that the gas in the walking hydraulic cylinder is completely discharged. Then install the rod-end ear plate pin shaft on the walking hydraulic cylinder, adjust the spacing and then install the rodless-end ear plate bolt.

[0115] Specifically, the overall translation step S300 includes a dragging state S310 and a pushing state S320:

[0116] Step S310, Dragging state: When the telescopic rod of the power mechanism 8 is in the extended state, install the power mechanism 8 on the deck and connect it to the first end of the first moving trolley 710. During the retraction process of the telescopic rod of the power mechanism 8, drag the first moving trolley 710 to move on the guide rail 5 towards the target position 4.

[0117] Step S320, Pushing State: When the telescopic rod of the power mechanism 8 is in the retracted state, install the power mechanism 8 on the deck and connect it to the second end of the first moving trolley 710. During the extension process of the telescopic rod of the power mechanism 8, push the first moving trolley 710 to move towards the target position 4 on the guide rail 5;

[0118] The overall translation step S300 consists of the dragging state S310 and the pushing state S320 cycling in sequence until the first moving trolley 710 is translated to the target position 4. In the embodiment, the first end of the first moving trolley 710 is the end of the first moving trolley 710 close to the target position 4, and the second end of the first moving trolley 710 is the end of the first moving trolley 710 far from the target position 4. In the dragging state S310, the walking hydraulic cylinder of the power mechanism 8 pulls the first end of the first moving trolley 710 to move 1800 mm, then disassemble the walking hydraulic cylinder and install it at the second end of the first moving trolley 710. After the walking hydraulic cylinder pushes the first moving trolley 710 to move 1800 mm, disassemble the walking hydraulic cylinder again and change the direction until the first moving trolley 710 is translated to the target position 4. To ensure safety, an insurance bolt needs to be installed on the first moving trolley 710 before disassembling the power mechanism 8 each time. Disassemble the insurance bolt before dragging or pushing the first moving trolley 710 to move after the installation of the power mechanism 8 is completed. In case of wind and waves, the insurance bolt should be installed in time and the movement should be stopped. The insurance bolt should be disassembled again to continue the movement when there is no wind and waves.

[0119] Step S400, Refer to Appendix Figure 13 , Landing on the Deck: Use the jacking mechanism 6 to lift the draghead hanger 1 and the draghead mechanism 2 as a whole and land them on the deck, and withdraw the translation mechanism 7:

[0120] Step S410, Jacking at the Target Position: The same as the initial position jacking step S210, the jacking mechanism 6 includes two first jacks 610, one second jack 620, and one third jack 630. The first jack 610 and the second jack 620 are 100-ton double-acting hydraulic jacks, and the third jack 630 is a 50-ton double-acting hydraulic jack; Install the insurance bolt before moving. The two first jacks 610 are respectively supported under the two trunnions of the draghead hanger 1, the third jack 630 is supported at the trunnion of the fixed end of the outer support hydraulic cylinder of the draghead hanger 1 for assistance, and the second jack 620 is placed under the draghead 210 and supports the draghead 210 through the first steel pipe 10. The first jack 610, the second jack 620, and the third jack 630 cooperate to lift the draghead hanger 1 and the draghead mechanism 2 as a whole;

[0121] Step S420, Withdraw the Translation Mechanism: Disassemble the insurance bolt, and withdraw the first moving trolley 710 and the second moving trolley 720 from the guide rail 5;

[0122] Step S430, Lowering the target position: The lifting mechanism 6 lowers the draghead hanger 1 and the draghead mechanism 2 as a whole, positions and fixes the base of the draghead hanger 1 on the deck, sets up the support rod 11 under the draghead 210 to support the draghead 210, and then withdraws the lifting mechanism 6.

[0123] Step SB0, Refer to the appendix Figure 14 , Post-movement processing:

[0124] Step SB1, Removal: Remove the power mechanism 8 and the guide rail 5; After moving the draghead hanger 1 and the draghead mechanism 2 from the initial position 3 to the target position 4, the power mechanism 8 and the guide rail 5 can be removed.

[0125] Step SB2, Cleaning: Use an angle grinder to cut the positioning angle steel, clean the welding slag and dust, and apply grease.

[0126] Step SB3, Installation: Install the base bolts of the draghead hanger 1.

[0127] Step S500, Drag pipe connection: Connect the draghead mud pipe 230 and the middle drag mud pipe 9, and adjust the length of the drag pipe by installing or removing the extension mud pipe between the draghead mud pipe 230 and the middle drag mud pipe 9. It also includes installing the draghead lifting wire 12 and connecting the wedge joint; Connect the draghead mud pipe 230 and the middle drag mud pipe 9, add the extension mud pipe when extending, and remove the extension mud pipe when shortening; Connect the high-pressure flushing water pipe and install the high-pressure flushing water pipe bolts, connect the power draghead hydraulic pipe, and connect the hydraulic cylinder oil pipe of the draghead hanger 1. Specifically, for the case where the drag pipe needs to be extended, during the process of connecting the draghead mud pipe 230 and the middle drag mud pipe 9, first measure the distance between the draghead mud pipe 230 and the middle drag mud pipe 9. When the distance is greater than the extension mud pipe, directly use the ship crane to hoist and install; when the distance is less than the extension mud pipe, cut open the draghead mud pipe 230, install the first manual hoist on the draghead mechanism 2, use the manual hoist to lift the draghead mechanism 2 10 mm away from the bracket on the draghead hanger 1, then install the second manual hoist in the horizontal direction to move the draghead mechanism 2 towards the stern platform 14, measure the distance while moving, make the distance about 10 mm greater than the length of the extension mud pipe, and then use the ship crane to hoist and install, and remove the two manual hoists.

[0128] In summary, the present embodiment provides a rake pipe length adjustment system and method for a trailing suction hopper dredger, which can achieve the displacement of the rake head mechanism 2 and the rake head suspension 1 on the deck of the trailing suction hopper dredger to carry out the construction of lengthening and shortening the rake pipe. This embodiment does not require a wharf, deployment, external lifting machinery and manpower support, and can completely utilize the equipment and personnel of the trailing suction hopper dredger to solve all the work of lengthening and shortening the ship's rake pipe; the equipment and materials can be taken out and used immediately without external support, and the guide rail erection and the displacement of the rake head suspension 1 and the rake head mechanism 2 can be completed on the deck of the trailing suction hopper dredger; the equipment and materials invested during the construction process can be reused as special tools once and for all; the traditional method of using a wharf tower crane to complete the rake pipe lengthening construction takes about 208 hours and the construction cost is about 840,000 yuan, and the traditional method of renting a floating crane to complete the rake pipe lengthening construction takes about 96 hours and the construction cost is about 270,000 yuan. Using the adjustment system and method proposed in this embodiment to complete the rake pipe lengthening construction takes about 41 hours and the construction cost is about 12,000 yuan. Therefore, compared with the traditional method of using a wharf tower crane or renting a floating crane, this embodiment has the advantages of simple and easy operation, convenient and fast construction, short construction period and low construction cost.

[0129] The above-described embodiments are only one of the more preferred specific embodiments of the present invention, and the ordinary changes and substitutions made by technicians in the technical scope of the present invention should be included in the protection scope of the present invention.

Claims

1. A drag head pipe length adjustment system for a trailing suction hopper dredger, which is used to move a drag head hanger (1) and a drag head mechanism (2) from an initial position (3) to a target position (4). Characterized in that: It includes: A guide rail (5) arranged on the deck, the guide rail (5) extends from the initial position (3) to the target position (4), the guide rail (5) includes a hanger displacement guide rail (510) and a drag head displacement guide rail (520), the hanger displacement guide rail (510) is arranged below the drag head hanger (1), and the drag head displacement guide rail (520) is arranged below the drag head (210) of the drag head mechanism (2); A jacking mechanism (6), the jacking mechanism (6) includes a first jack (610) for jacking up the drag head hanger (1) and a second jack (620) for jacking up the drag head (210); A translation mechanism (7), the translation mechanism (7) includes a first moving trolley (710) arranged below the drag head hanger (1) and a second moving trolley (720) arranged below the drag head (210), the first moving trolley (710) can move along the length extension direction of the hanger displacement guide rail (510), and the second moving trolley (720) can move along the length extension direction of the drag head displacement guide rail (520); A power mechanism (8) connected to the translation mechanism (7), the power mechanism (8) is used to push the translation mechanism (7) to move on the guide rail (5).

2. The drag head pipe length adjustment system for a trailing suction hopper dredger according to claim 1, Characterized in that: The first jack (610) and the second jack (620) are 100-ton double-acting hydraulic jacks. There are two first jacks (610) in total, which are respectively supported under the two trunnions of the drag head hanger (1). The second jack (620) is placed below the drag head (210), and a first steel pipe (10) is also arranged between the drag head (210) and the second jack (620), and the first steel pipe (10) supports the drag head (210).

3. The drag head pipe length adjustment system for a trailing suction hopper dredger according to claim 2, Characterized in that: The jacking mechanism (6) further includes a third jack (630), the third jack (630) is a 50-ton double-acting hydraulic jack, and the third jack (630) is supported at the fixed end trunnion of the outer support hydraulic cylinder of the drag head hanger (1).

4. The drag head pipe length adjustment system for a trailing suction hopper dredger according to claim 1, Characterized in that: The power mechanism (8) drives the second moving trolley (720) to move along the length extension direction of the drag head displacement guide rail (520) by means of a chain drive method or a belt drive method or a hydraulic cylinder drive method or an electric telescopic rod drive method.

5. The drag head pipe length adjustment system for a trailing suction hopper dredger according to claim 4, Characterized in that: The power mechanism (8) is a walking hydraulic cylinder.

6. A method for adjusting the length of a drag head pipe of a trailing suction hopper dredger It is characterized in that the method uses a drag head pipe length adjustment system of a trailing suction hopper dredger according to any one of claims 1-5, and the method includes: Laying a guide rail: Laying a guide rail (5) under the drag head hanger (1) and the drag head (210) on the deck; Load transfer: Using a lifting mechanism (6) to transfer the drag head hanger (1) and the drag head mechanism (2) as a whole to a translation mechanism (7) placed on the guide rail (5); Overall translation: Installing a power mechanism (8), and translating the drag head hanger (1) and the drag head mechanism (2) to a target position (4) by dragging and / or pushing the translation mechanism (7); Landing on the deck: Using the lifting mechanism (6) to lift the drag head hanger (1) and the drag head mechanism (2) as a whole and land them on the deck, and withdrawing the translation mechanism (7); Drag head pipe connection: Connecting the drag head mud pipe (230) and the middle drag head mud pipe (9), and adjusting the length of the drag head pipe by installing or removing an extension mud pipe between the drag head mud pipe (230) and the middle drag head mud pipe (9).

7. A method for adjusting the length of a drag head pipe of a trailing suction hopper dredger according to claim 6, It is characterized in that the load transfer step includes: Initial position lifting: Two first jacks (610) are respectively supported under the two trunnions of the drag head hanger (1), the second jack (620) is placed under the drag head (210) and supports the drag head (210) through a first steel pipe (10), and further includes a third jack (630) arranged at the trunnion of the fixed end of the outer support hydraulic cylinder of the drag head hanger (1). The first jack (610), the second jack (620) and the third jack (630) cooperate to lift the drag head hanger (1) and the drag head mechanism (2) as a whole; Placing the translation mechanism: Placing a first moving trolley (710) under the base of the drag head hanger (1), and placing a second moving trolley (720) under the drag head (210); Lowering at the initial position: The lifting mechanism (6) lowers the drag head hanger (1) and the drag head mechanism (2) as a whole, transfers the load of the base of the drag head hanger (1) to the first moving trolley (710), transfers the load of the drag head (210) to the second moving trolley (720), and withdraws the lifting mechanism (6).

8. A method for adjusting the length of a drag head pipe of a trailing suction hopper dredger according to claim 7, It is characterized in that the overall translation step includes a dragging state and a pushing state: Dragging state: When the telescopic rod of the power mechanism (8) is in the extended state, the power mechanism (8) is installed on the deck and connected to the first end of the first moving trolley (710), and the first moving trolley (710) is dragged to move towards the target position (4) on the guide rail (5) during the retraction process of the telescopic rod of the power mechanism (8); Pushing state: When the telescopic rod of the power mechanism (8) is in the retracted state, the power mechanism (8) is installed on the deck and connected to the second end of the first moving trolley (710), and the first moving trolley (710) is pushed to move towards the target position (4) on the guide rail (5) during the extension process of the telescopic rod of the power mechanism (8); The overall translation step cycles in sequence between the dragging state and the pushing state until the first moving trolley (710) is translated to the target position (4).

9. A method for adjusting the length of the drag head pipe of a trailing suction hopper dredger according to claim 8, characterized in that the step of positioning on the deck includes: Lifting at the target position: Two first jacks (610) are respectively supported under the two trunnions of the drag head hanger (1), the second jack (620) is placed under the drag head (210) and supports the drag head (210) through the first steel pipe (10). There is also a third jack (630) provided at the trunnion of the fixed end of the outer support hydraulic cylinder of the drag head hanger (1). The first jack (610), the second jack (620) and the third jack (630) cooperate to lift the drag head hanger (1) and the drag head mechanism (2) as a whole; Withdrawing the translation mechanism: Withdraw the first moving trolley (710) and the second moving trolley (720) from the guide rail (5); Lowering at the target position: The lifting mechanism (6) lowers the drag head hanger (1) and the drag head mechanism (2) as a whole, fixes the base of the drag head hanger (1) on the deck, sets a support rod (11) under the drag head (210) to support the drag head (210), and withdraws the lifting mechanism (6).

10. A method for adjusting the length of the drag head pipe of a trailing suction hopper dredger according to any one of claims 6-9, characterized in that Before the step of laying the guide rail, pre-movement preparations are also included, and after the step of positioning on the deck, post-movement processing is also included; The pre-movement preparations include: Adjusting the ballast: Adjust the ballast of the trailing suction hopper dredger to make the longitudinal inclination and transverse inclination of the trailing suction hopper dredger zero; Sealing and fixing by welding: Seal and weld the drag head hanger (1) and the drag head mechanism (2), seal and weld the drag head (210), the rotary joint (220) and the drag head mud pipe (230) of the drag head mechanism (2) to form an integral whole between the drag head hanger (1) and the drag head mechanism (2); Disconnecting the drag head pipe: Disassemble the drag head lifting wire (12), disconnect the connection between the drag head mud pipe (230) and the middle drag head mud pipe (9), disassemble the hydraulic pipe, and disassemble the base bolts of the drag head hanger (1); The post-movement processing includes: Removing: Remove the power mechanism (8) and the guide rail (5); Cleaning: Clean the welding slag and dust and apply grease; Installing: Install the base bolts of the drag head hanger (1).

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