A method for zoned ore discharge in a tailings dam

Abstract

This invention relates to the field of tailings accumulation technology, and more particularly to a method for zoned tailings discharge in tailings dams. By connecting the inlet of the main pipe of the discharge system to the tailings slurry source at the top of the dam, and arranging the outlet of the main pipe in the main channel of the tailings dam, the outlets of the branch pipes of the discharge system are arranged along the periphery of the main channel. The discharge volume of tailings slurry from the outlets of the main pipe and branch pipes in the discharge system is controlled according to the predetermined sedimentation surface of the main channel. Alternatively, the outlet of the main pipe of the discharge system is arranged one by one in each branch channel, and the outlet of the branch pipe of the discharge system is arranged along the periphery of each branch channel. The discharge volume of tailings slurry in the main pipe and branch pipes of the discharge system is controlled according to the predetermined sedimentation surface of the current branch channel. This zoned tailings discharge method can adapt to complex terrain with multiple sub-channels in a tailings dam, enabling tailings slurry to be discharged as needed in each channel, avoiding rapid accumulation or uneven consolidation in front of the dam, thereby improving the overall stability and safety of the dam.

Description

Technical Field

[0001] This invention relates to the field of tailings accumulation technology, and in particular to a method for zoned ore discharge from a tailings dam. Background Technology

[0002] Tailings dams are specialized facilities built within mining areas by mineral processing plants, metallurgical plants, and other mining enterprises to store mineral processing waste. Their main functions are long-term or short-term storage of water-bearing tailings slurry, achieving tailings settling and dewatering, and ensuring the safety of the production area and surrounding environment. A tailings dam consists of the dam body, drainage and return water systems, conveying and discharge facilities, monitoring and safety facilities, etc. Its stable operation depends on a reasonable ore discharge method and conveying system. Most tailings dams adopt an upstream dam construction method. Based on an initial dam, tailings slurry is discharged into the dam area from near the dam crest along the dam crest and its perimeter, forming a sedimentation beach in front of the dam. As the beach gradually rises, to expand the dam capacity, sub-dams are built on top of the original dam in stages. During construction, the existing sedimentation beach and parts of the previous dam body are used as a foundation, pushing outwards and raising the height layer by layer until the design elevation is reached.

[0003] Current tailings discharge methods primarily adjust the discharge area based on the length and flatness of the dry beach. The discharge location and transport path are usually fixed or only periodically adjusted manually. When the tailings slurry discharge increases significantly, the rapid accumulation on the beach in front of the dam leads to a faster dam crest uplift, reducing the effective reservoir capacity. Simultaneously, insufficient or uneven consolidation of the beach body in front of the dam easily creates strength differences, increasing the risk of dam slippage or seepage failure. In actual mine topography, tailings dams often exhibit a complex form with multiple sub-ditches coexisting. Traditional fixed or periodically adjusted discharge methods are even less adaptable to this non-uniform reservoir structure, resulting in a mismatch between the discharge volume of tailings slurry at different sections of the dam crest and actual demand. This further exacerbates the uneven consolidation of the beach body in front of the dam, severely affecting the overall stability of the dam. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a tailings dam zoned ore discharge method, which solves the technical problem of poor stability of tailings dam body in complex mining terrain.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0008] This invention provides a method for zoned ore discharge from a tailings dam, comprising the following steps:

[0009] S1. Connect the inlet of the main pipeline of the ore discharge system to the tailings slurry source on the top of the dam, and arrange the outlet of the main pipeline in the main ditch of the tailings dam. Arrange the outlets of the branch pipelines of the ore discharge system around the perimeter of the main ditch.

[0010] S2. Based on the pre-set sedimentation beach of the main channel, control the discharge volume of tailings slurry at the outlet of the main pipeline and the outlet of the branch pipeline in the ore discharge system.

[0011] S3. Arrange the outlet end of the main pipeline of the ore discharge system in each branch trench, and arrange the outlet of the branch pipeline of the ore discharge system along the perimeter of each branch trench.

[0012] S4. Based on the preset sedimentation beach surface of the current branch ditch, control the discharge volume of tailings slurry in the main pipeline and branch pipeline of the ore discharge system.

[0013] Preferably, in step S1, the ore discharge system includes a floating bridge, at least one main pipeline and multiple branch pipelines. The floating bridge floats in the tailings dam, the main pipeline is laid on the floating bridge and arranged along the direction of the floating bridge, and the multiple branch pipelines are distributed at intervals along both sides of the main pipeline and connected to the main pipeline.

[0014] Preferably, in step S1 or step S3, the floating bridge is fixed to a predetermined position in the tailings dam by an anchoring device, so that the outlet of the main pipeline is arranged at a predetermined position in the main ditch or branch ditch.

[0015] Preferably, the anchoring device includes anchor cables and anchor blocks that are set in a one-to-one correspondence; when fixing the floating bridge, one end of the anchor cable is connected to the floating bridge and the other end is connected to the corresponding anchor block.

[0016] Preferably, in step S2 or step S4, the outlet direction of the main pipeline and the branch pipeline is adjusted by an angle adjustment device; the angle adjustment device includes multiple first connectors, multiple second connectors and multiple adjustment ropes; the first connectors are spaced apart on both sides of the floating bridge, the second connectors are located on the slope of the tailings dam, one end of the adjustment rope is connected to the first connector and the other end is connected to the second connector, and the orientation of the floating bridge is adjusted by adjusting the distance between the first connectors and the second connectors at both ends of the adjustment rope.

[0017] Preferably, the floating bridge includes multiple floating units and connecting units; adjacent floating units are connected by connecting units so that the shape of the floating bridge can be adapted to the shape of the main ditch in step S1 or the branch ditch in step S3.

[0018] Preferably, the connecting unit includes multiple connecting hooks and multiple connecting ropes. The multiple connecting hooks are respectively disposed on the floating unit, and the connecting ropes connect the connecting hooks on two adjacent floating units. The floating unit includes multiple buoys and multiple splicing components, and adjacent buoys are connected by splicing components.

[0019] Preferably, in step S1 or step S3, a plurality of spaced-apart support seats are detachably installed on the upper surface of the pontoon bridge, and the main pipeline is supported by the support seats.

[0020] Preferably, in step S2 or step S4, the tailings slurry discharge flow rate of the corresponding branch pipe is adjusted by a flow regulating valve installed on each branch pipe, so that the main ditch or branch ditch can receive tailings slurry as needed.

[0021] Preferably, in step S3, when the outlet end of the main pipeline is arranged in each branch ditch, after the sedimentation beach of the current branch ditch reaches the preset requirements, the floating bridge and the main pipeline and branch pipeline on it are moved to the next branch ditch for ore discharge operation.

[0022] (III) Beneficial Effects

[0023] The beneficial effects of this invention are:

[0024] This invention discloses a method for zoned tailings discharge in a tailings dam. The method connects the inlet of the main pipeline of the discharge system to the tailings slurry source at the top of the dam. The outlet of the main pipeline is located in the main channel of the tailings dam, and the outlets of the branch pipelines of the discharge system are arranged along the periphery of the main channel. The discharge volume of tailings slurry from the outlets of the main pipeline and branch pipelines is controlled according to the predetermined sedimentation surface of the main channel. The outlet of the main pipeline is arranged one by one in each branch channel, and the outlet of the branch pipeline is arranged along the periphery of each branch channel. The discharge volume of tailings slurry in the main pipeline and branch pipelines is controlled according to the predetermined sedimentation surface of the current branch channel. This zoned tailings discharge method adapts to the complex terrain of multiple sub-channels in a tailings dam by discharging tailings in zones and steps, enabling tailings slurry to be discharged as needed in each channel, avoiding rapid accumulation or uneven consolidation in front of the dam, thereby improving the overall stability and safety of the dam. Attached Figure Description

[0025] Figure 1 A schematic diagram of the ore discharge system set up in the main trench;

[0026] Figure 2 This is a partial structural diagram of the ore discharge system;

[0027] Figure 3 This is a partial structural diagram of the ore-feeding system;

[0028] Figure 4 for Figure 3 An enlarged schematic diagram of part A in the middle;

[0029] Figure 5 for Figure 3 The front view;

[0030] Figure 6 This is a schematic diagram of the floating unit.

[0031] [Explanation of Labels in the Attached Image]

[0032] 1: Ore discharge system; 11: Floating bridge; 111: Floating unit; 1111: Buoy; 1112: Splicing component; 112: Connecting unit; 12: Main pipeline; 13: Branch pipeline; 14: Flow regulating valve; 15: Angle adjusting device; 151: First connecting component; 152: Second connecting component; 153: Adjusting rope; 16: Support base;

[0033] 2: Main ditch;

[0034] 3: Branch ditch. Detailed Implementation

[0035] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] This invention provides a tailings dam zoned ore discharge method, which uses ore discharge system 1 for ore discharge. The specific composition and connection method of the system will be described in detail below.

[0037] like Figure 1 and Figure 2 As shown, the tailings discharge system 1 includes a floating bridge 11, at least one main pipeline 12, and multiple branch pipelines 13. The floating bridge 11 floats on the water accumulation area within the tailings dam. The main pipeline 12 is laid on the floating bridge 11 and arranged along its longitudinal direction, used to transport the tailings slurry from the dam crest along the direction of the floating bridge 11 to the depths of the dam area. Multiple branch pipelines 13 are distributed at intervals along both sides of the main pipeline 12. The inlet of each branch pipeline 13 is connected to the main pipeline 12 via a tee joint, and the outlet of the branch pipeline 13 extends beyond the edge of the floating bridge 11, towards the slope of the tailings dam. Simultaneously, the branch pipelines 13, distributed at intervals on both sides, achieve multi-point, decentralized discharge of tailings slurry, improving the uniformity of sedimentation on the beach surface and avoiding conical accumulation caused by single-point discharge. Figure 3 As shown, in this embodiment, there are two parallel main pipes 12, and multiple branch pipes 13 are respectively arranged on the two outer sides of the main pipes 12.

[0038] like Figure 2 As shown, to adapt to the curved terrain of the main ditch 2 and tributary ditch 3 in the tailings dam, the floating bridge 11 adopts a flexible structure. The floating bridge 11 includes multiple floating units 111 and connecting units 112. Adjacent floating units 111 are connected by connecting units 112, allowing the shape of the floating bridge 11 to adapt to the shape of the main ditch 2 or tributary ditch 3. When the ditch has a curved shape, the connecting units 112 allow for a certain angle of relative rotation between adjacent floating units 111, thus giving the floating bridge 11 a curved shape.

[0039] like Figure 2As shown, the connecting unit 112 includes multiple connecting hooks and multiple connecting ropes. The multiple connecting hooks are respectively fixedly disposed on the end face or side face of each floating unit 111. The connecting ropes connect the connecting hooks on two adjacent floating units 111, achieving flexible hinged connection. Figure 6 As shown, the floating unit 111 includes multiple pontoons 1111 and multiple connectors 1112. Adjacent pontoons 1111 are detachably connected by connectors 1112, thus allowing for the assembly of floating units 111 of different lengths and widths as needed. The floating bridge 11 achieves modular assembly, facilitating on-site assembly or disassembly and improving the transportation convenience of the equipment. Simultaneously, its flexible bending capability allows the floating bridge 11 to adapt to complex and winding valley terrain, ensuring the effective arrangement of the branch pipe 13 outlet along the perimeter of the valley.

[0040] To prevent the main pipe 12 from shifting, multiple spaced support seats 16 are detachably installed on the upper surface of the floating bridge 11. The main pipe 12 is placed on the support seats 16 and fixed to them relative to each other by pipe clamps or cable ties. The top of the support seat 16 has an arc-shaped groove adapted to the main pipe 12. The support seat 16 maintains a stable relative position between the main pipe 12 and the floating bridge 11, preventing the main pipe 12 from rolling or shifting due to fluid pulsation inside the pipe or shaking of the floating bridge 11.

[0041] To secure the floating bridge 11 to the predetermined ore discharge location within the tailings dam, the ore discharge system 1 also includes an anchoring device (not shown). Before the ore discharge operation, the floating bridge 11 is fixed to the predetermined location within the tailings dam using the anchoring device, ensuring that the outlet of the main pipeline 12 is accurately positioned at the predetermined location in the main channel 2 or branch channel 3. Specifically, the anchoring device includes corresponding anchor cables and anchor blocks. When securing the floating bridge 11, one end of the anchor cable is connected to the anchor lug of the floating bridge 11 via a shackle or knot, and the other end is connected to an anchor block pre-cast or driven into the dam slope or beach area. By installing the anchoring device, the floating bridge 11 is effectively prevented from drifting or rotating under water flow, wind force, or discharge reaction force, ensuring that the outlet directions of the main pipeline 12 and branch pipeline 13 remain stable over the long term.

[0042] To further flexibly adjust the discharge direction of the tailings slurry, the tailings discharge system 1 also includes an angle adjustment device 15, which is used to adjust the outlet direction of the main pipe 12 and the branch pipe 13. Figure 2 and Figure 4As shown, the angle adjustment device 15 includes multiple first connectors 151, multiple second connectors 152, and multiple adjustment ropes 153. The first connectors 151 are spaced apart on both sides of the floating bridge 11, and the second connectors 152 are located in the stable rock and soil of the tailings dam slope. One end of the adjustment rope 153 is connected to the first connector 151, and the other end is connected to the second connector 152. By adjusting the distance between the first connectors 151 and the second connectors 152 at both ends of the adjustment rope 153, the orientation of the floating bridge 11 is adjusted. In use, by tightening or loosening the adjustment ropes 153 on different sides or at different positions, the distance between the first connectors 151 and the second connectors 152 is changed, thereby pulling the floating bridge 11 to deflect or shift as a whole in the horizontal plane, ultimately adjusting the outlet direction of the main pipe 12 and the branch pipe 13 on the floating bridge 11.

[0043] To achieve on-demand ore release, such as Figure 3 and Figure 5 As shown, each branch pipe 13 is equipped with a flow regulating valve 14 (e.g., ball valve, butterfly valve, or needle valve). By independently adjusting the opening of each flow valve, the tailings slurry discharge flow rate of the corresponding branch pipe 13 can be independently controlled, so that different areas of the main ditch 2 or branch ditch 3 can receive tailings slurry as needed.

[0044] Using the above-described tailings discharge system 1, this embodiment provides a tailings dam zoned discharge method, which includes the following steps:

[0045] S1. Connect the inlet of the main pipeline 12 of the ore discharge system 1 to the tailings slurry source on the top of the dam, extend the outlet of the main pipeline 12 along the direction of the floating bridge 11 and arrange it in the main ditch 2 of the tailings dam, and at the same time, arrange the outlets of multiple branch pipelines 13 in the ore discharge system 1 around the main ditch 2.

[0046] In step S1, the floating bridge 11 can be fixed in a preset position within the main ditch 2 by the anchoring device, and the main pipeline 12 can be firmly supported by the support seat 16. The tailings slurry is first transported to the central area of ​​the main ditch 2 through the main pipeline 12, and then dispersed through the surrounding branch pipelines 13, which can form a preliminary uniform sedimentation beach within the main ditch 2 and prevent the tailings slurry from accumulating in front of the dam.

[0047] S2. After the layout of the ore discharge system 1 is completed, the operator can discharge ore from the main channel 2 by controlling the discharge volume of tailings slurry at the outlet of the main pipeline 12 and the outlet of the branch pipeline 13 in the ore discharge system 1, according to the preset sedimentation beach surface of the main channel 2 (including parameters such as dry beach length and beach surface thickness).

[0048] In step S2, specifically, the pressure of the delivery pump is adjusted, the opening of the flow regulating valve 14 on each branch pipe 13 is changed, and the discharge direction is finely adjusted through the angle adjustment device 15. When the deposition in the central area of ​​the main ditch 2 is insufficient, the discharge volume of the main pipe 12 can be increased; when the thickness of the beach on both sides of the main ditch 2 is uneven, the discharge of the corresponding side branch pipe 13 can be increased. By controlling the differentiated discharge at different discharge points within the main ditch 2 area, the formation process of the beach can be actively intervened, so that the deposition beach of the main ditch 2 remains uniform and controllable in both the width and length directions, effectively preventing local rapid accumulation or delayed consolidation, thereby improving the stability of the dam.

[0049] S3. Once the sedimentation surface of the main channel 2 reaches the required level, the ore discharge stage begins in the branch channels 3. Operators move the outlet of the main pipe 12 of the ore discharge system 1 out of the main channel 2 and arrange it one by one in each branch channel 3 of the tailings dam, following a sequence from farthest to nearest (i.e., starting with the branch channels 3 furthest from the dam crest and gradually moving towards the branch channels 3 closest to the main dam). Before ore discharge in each branch channel 3, the floating bridge 11 at that branch channel 3 must be secured using anchoring devices, and the outlet of the branch pipe 13 must be arranged along the perimeter of that branch channel 3.

[0050] It is particularly important to emphasize that "arrangement one by one" here means that after the sedimentation surface of the current branch channel 3 reaches the preset requirements, the floating bridge 11 and its main pipeline 12 and branch pipeline 13 are moved to the next branch channel 3 for ore discharge operations. Given the complex terrain of multiple sub-channels in the tailings dam, the "rowing ore one channel at a time, advancing sequentially" method avoids mutual interference and uneven sedimentation caused by simultaneous ore discharge from multiple channels, ensuring that each branch channel 3 has sufficient consolidation time, allowing each branch channel 3 to obtain an independent and complete ore discharge cycle, and ensuring that the beach body of the branch channel 3 is fully and uniformly consolidated.

[0051] S4. During the ore discharge process in each branch ditch 3, the operator discharges ore into the current branch ditch 3 by controlling the tailings slurry discharge volume of the main pipe 12 and each branch pipe 13 in the ore discharge system 1, based on the preset sedimentation beach surface of that branch ditch 3. The control method is similar to step S2, including adjusting the opening of the flow regulating valve 14 and adjusting the discharge direction through the angle adjusting device 15.

[0052] This tailings dam zoning and discharge method can adapt to the complex terrain of multiple sub-ditches in the tailings dam by discharging tailings in sections and steps, so as to discharge tailings slurry in each ditch as needed, avoid rapid accumulation or uneven consolidation in front of the dam, and thus improve the overall stability and safety of the dam.

[0053] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0054] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0056] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0057] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for zoned ore discharge in a tailings dam, characterized in that, Includes the following steps: S1. Connect the inlet of the main pipe (12) of the ore discharge system (1) to the tailings slurry source on the top of the dam. The outlet of the main pipe (12) is arranged in the main ditch (2) of the tailings pond, and the outlet of the branch pipe (13) of the ore discharge system (1) is arranged around the main ditch (2). S2. Based on the preset sedimentation beach of the main channel (2), control the discharge of tailings slurry at the outlet of the main pipeline (12) and the outlet of the branch pipeline (13) in the ore discharge system (1); S3. Arrange the outlet end of the main pipe (12) of the ore discharge system (1) in each branch ditch (3) one by one, and arrange the outlet of the branch pipe (13) of the ore discharge system (1) along the periphery of the branch ditch (3) at each branch ditch (3). S4. Based on the preset sedimentation beach of the current branch ditch (3), control the discharge of tailings slurry in the main pipeline (12) and branch pipeline (13) of the ore discharge system (1).

2. The tailings dam zoned ore discharge method as described in claim 1, characterized in that: In step S1, the ore discharge system (1) includes a floating bridge (11), at least one main pipeline (12) and multiple branch pipelines (13). The floating bridge (11) floats in the tailings dam. The main pipeline (12) is laid on the floating bridge (11) and arranged along the direction of the floating bridge (11). The multiple branch pipelines (13) are distributed at intervals along both sides of the main pipeline (12) and are connected to the main pipeline (12).

3. The tailings dam zoned ore discharge method as described in claim 2, characterized in that: In step S1 or step S3, the floating bridge (11) is fixed to a preset position in the tailings dam by an anchoring device, so that the outlet of the main pipeline (12) is arranged in a preset position in the main ditch (2) or the branch ditch (3).

4. The tailings dam zoned ore discharge method as described in claim 3, characterized in that: The anchoring device includes anchor cables and anchor blocks that are installed in a one-to-one correspondence; When fixing the floating bridge (11), one end of the anchor cable is connected to the floating bridge (11), and the other end is connected to the corresponding anchor pier.

5. The tailings dam zoned ore discharge method as described in claim 2, characterized in that: In step S2 or step S4, the outlet directions of the main pipe (12) and the branch pipe (13) are adjusted by the angle adjustment device (15); The angle adjustment device (15) includes multiple first connectors (151), multiple second connectors (152), and multiple adjustment ropes (153). The first connector (151) is spaced apart on both sides of the floating bridge (11), and the second connector (152) is located on the slope of the tailings dam. One end of the adjusting rope (153) is connected to the first connector (151), and the other end is connected to the second connector (152). The orientation of the floating bridge (11) is adjusted by adjusting the distance between the first connector (151) and the second connector (152) at both ends of the adjusting rope (153).

6. The tailings dam zoned ore discharge method as described in claim 2, characterized in that: The floating bridge (11) includes multiple floating units (111) and connecting units (112). Adjacent floating units (111) are connected by connecting units (112) so that the shape of the floating bridge (11) can be adapted to the shape of the main ditch (2) in step S1 or the branch ditch (3) in step S3.

7. The tailings dam zoned ore discharge method as described in claim 6, characterized in that: The connecting unit (112) includes multiple connecting hooks and multiple connecting ropes. The multiple connecting hooks are respectively disposed on the floating unit (111), and the connecting ropes connect the connecting hooks on two adjacent floating units (111). The floating unit (111) includes multiple pontoons (1111) and multiple splicing components (1112), and adjacent pontoons (1111) are connected by the splicing components (1112).

8. The tailings dam zoned ore discharge method as described in claim 2, characterized in that: In step S1 or step S3, a plurality of spaced support seats (16) are detachably installed on the upper surface of the floating bridge (11), and the main pipeline (12) is supported by the support seats (16).

9. The tailings dam zoned ore discharge method as described in claim 2, characterized in that: In step S2 or step S4, the tailings slurry discharge flow rate of the corresponding branch pipe (13) is adjusted by the flow regulating valve (14) set on each branch pipe (13) so that the main ditch (2) or the branch ditch (3) can receive tailings slurry as needed.

10. The tailings dam zoned ore discharge method as described in any one of claims 1-9, characterized in that: In step S3, when the outlet end of the main pipeline (12) is arranged in each branch ditch (3), after the sedimentation beach of the current branch ditch (3) reaches the preset requirements, the floating bridge (11) and the main pipeline (12) and branch pipeline (13) on it are moved to the next branch ditch (3) for ore discharge operation.

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