A horizontal-vertical double-layer drainage board vacuum preloading system and its method for treating engineering waste mud

Abstract

The present invention discloses a horizontal-vertical double-layer drainage board vacuum preloading system, which is characterized in that: it includes a preloading tank, a vacuum pump, a plurality of horizontal drainage board systems and a plurality of vertical drainage board systems. Both side walls of the preloading tank are provided with vertical drain pipes. A plurality of horizontal drainage board systems are laid on the lower layer of the preloading tank. The horizontal drainage board system is a drainage board system laid horizontally. Both sides of the horizontal drainage board system are respectively connected to the vertical drain pipes on both sides through elbow pipes in a conducting manner. The spacing between adjacent horizontal drainage board systems is equal. A plurality of vertical drainage board systems are laid on the upper layer of the preloading tank. The vertical drainage board system is a drainage board system laid vertically. Both the upper and lower sides of the vertical drainage board system are respectively connected to the vertical drain pipes on both sides through drain pipes in a conducting manner. The spacing between adjacent vertical drainage board systems is equal. One vacuum pump is respectively connected to the end parts of the vertical drain pipes on both sides. This system has good structural stability, good vacuum degree transfer effect of the structure, fast drainage rate and larger settlement amount.

Description

Technical Field

[0001] The present invention relates to a horizontal-vertical double-layer drainage board vacuum preloading system, and the present invention also relates to a method for treating engineering waste mud by using the horizontal-vertical double-layer drainage board vacuum preloading system. Background Art

[0002] At present, the construction of railway subgrades, bridges, various pile foundations and cast-in-place piles requires a large amount of drilling mud, resulting in a significant increase in the amount of waste mud after construction, becoming a new environmental hazard. At present, waste mud is mostly treated by the method of natural sedimentation in sedimentation ponds. However, it is very difficult for waste mud to sediment and separate in the natural state. If it is not treated in time and effectively, it will have a certain impact on the surrounding environment. The inflow of waste mud into water bodies will not only silt up river channels, but also aggravate the pollution of COD, SS, oils, etc. in the water bodies; if it overflows onto farmland or is directly landfilled, it will change the physical and chemical properties of the soil and have an adverse impact on the growth and development of crops; if it overflows into fish ponds and other farms, it will cause water turbidity and hypoxia, affecting the normal growth of aquatic products such as fish. Therefore, it is necessary to strengthen the management of waste mud at the construction site and propose effective on-site treatment technologies for waste mud to reduce its harm to the environment. The previous treatment methods of waste mud were mainly direct discharge, direct landfill or landfill or transportation away from the construction site after natural sedimentation in sedimentation ponds. At present, the vacuum preloading technology is used to treat mud. The compression amount of the conventional vertical drainage board vacuum preloading for treating waste mud can reach 30% - 40%. However, the vacuum preloading technology using vertical drainage boards has its deficiencies in mud treatment. During the vacuum pumping process, due to well resistance and smearing effect, the vacuum degree will decay with depth and radially during the transfer process. And due to the vertical consolidation of the soil caused by vacuum preloading, it is easy to cause serious bending of the drainage board, and fine particles enter the filter membrane and the board core, resulting in the problem of siltation of the vertical drainage board, affecting the final drainage effect. Summary of the Invention

[0003] In view of the deficiencies in the background art, the technical problem to be solved by the present invention is to provide a horizontal-vertical double-layer drainage board vacuum preloading system. This system not only has good stability, but also has good vacuum degree transfer effect, fast drainage rate and larger settlement amount.

[0004] To this end, a horizontal-vertical double-layer drainage board vacuum preloading system provided by the present invention includes a preloading tank, a vacuum pump, a plurality of horizontal drainage board systems, and a plurality of vertical drainage board systems. Both side walls of the preloading tank are provided with vertical drain pipes. A plurality of horizontal drainage board systems are laid on the lower layer of the preloading tank. The horizontal drainage board systems are drainage board systems laid horizontally. Both sides of the horizontal drainage board systems are respectively connected to the vertical drain pipes on both sides through elbow pipes in a conducting manner. The spacing between adjacent horizontal drainage board systems is equal. A plurality of vertical drainage board systems are laid on the upper layer of the preloading tank. The vertical drainage board systems are drainage board systems laid vertically. The upper and lower sides of the vertical drainage board systems are respectively connected to the vertical drain pipes on both sides through drain pipes in a conducting manner. The spacing between adjacent vertical drainage board systems is equal. One vacuum pump is respectively connected to the end parts of the vertical drain pipes on both sides.

[0005] Advantages of the present invention:

[0006] 1. By adopting the layout form of upper and lower layers of horizontal drainage boards and vertical drainage boards, the respective performances of the two types of drainage boards are fully utilized, resulting in better vacuum degree transfer effect, faster drainage rate, and larger settlement amount in the whole soil mass;

[0007] 2. By adopting the integral transverse drainage board system and longitudinal drainage board system, the drainage boards in each layer and each column can always be kept on the same plane, and the overall structure is stable, avoiding the adverse effects caused by the bending or breaking of the drainage boards. The layout form is also much simpler, reducing a large amount of manpower and material resources;

[0008] 3. By laying horizontal drainage boards on the lower layer and starting vacuum pumping in the early stage, the consolidation of the lower-layer slurry can be started earlier, the settlement amount of the slurry can be increased earlier, and then the total conveying amount of the whole slurry pond can be increased, saving money and reducing energy consumption;

[0009] 4. In the form of separate vacuum pumping for the upper and lower layers, the clear water generated during the vacuum pumping process can be fully utilized, and a reasonable construction drainage system can be arranged to reuse the discharged water;

[0010] 5. It can save 1 / 3 - 1 / 2 of the construction period and reduce 1 / 4 - 1 / 3 of the cost, having better economic benefits and broad application prospects;

[0011] 6. The drainage board wrapped with geotextile has a longer service life and can effectively reduce the entry of particles into the drainage board, thereby reducing the drainage rate. Description of the drawings

[0012] Figure 1 It is a schematic structural diagram of a horizontal-vertical double-layer drainage board vacuum preloading system provided by the first embodiment of the present invention;

[0013] Figure 2 isFigure 1 Schematic structural diagram of the drainage board system in a horizontal-vertical double-layer drainage board vacuum preloading system;

[0014] Figure 3 is Figure 1 Schematic structural diagram of the lower layer of the preloading tank in a horizontal-vertical double-layer drainage board vacuum preloading system;

[0015] Figure 4 is Figure 1 Schematic structural diagram of the distribution of the drainage board system in the upper layer of the preloading tank in a horizontal-vertical double-layer drainage board vacuum preloading system provided;

[0016] Figure 5 Schematic structural diagram of a horizontal-vertical double-layer drainage board vacuum preloading system provided in the second embodiment of the present invention. Specific embodiments

[0017] Referring to Figures 1 - 5 As shown, a horizontal-vertical double-layer drainage board vacuum preloading system described in the first embodiment of the present invention includes a preloading tank 1, a vacuum pump 2, a plurality of horizontal drainage board systems 3, and a plurality of vertical drainage board systems 4. The depth of the preloading tank 1 is greater than 3 meters. Both side walls of the preloading tank 1 are provided with vertical drain pipes 5, and one vacuum pump 2 is respectively connected to the end parts of the vertical drain pipes 5 on both sides. A plurality of horizontal drainage board systems 3 are laid on the lower layer of the preloading tank 1. The horizontal drainage board system 3 is a drainage board system 6 laid horizontally. The plurality of horizontal drainage board systems 3 are arranged longitudinally. After the horizontal drainage boards in the lower layer of the preloading tank are laid, they are sealed with a sealing film. Laying the horizontal drainage board system in the lower layer of the preloading tank can prevent the drainage board system from being severely bent during the evacuation process. At the same time, the lower layer of horizontal drainage boards can cause the slurry to rapidly expand in the preloading tank under the pressure of the upper soil weight, increasing the drainage volume and drainage rate.

[0018] A plurality of vertical drainage board systems 4 are laid on the upper layer of the preloading tank 1. The vertical drainage board system 4 is a drainage board system 6 laid vertically. The plurality of vertical drainage board systems 4 are arranged horizontally. Since the self-weight of the slurry in the upper layer of the preloading tank is small, the horizontal drainage board system is under less pressure in the upper layer of the preloading tank, and the drainage treatment effect is poor. While using the vertical drainage board system in the upper layer of the preloading tank has a higher drainage efficiency. At the same time, the vertical drainage board system in the upper layer is under less slurry pressure, and the vertical drainage board system will not deform during the vertical consolidation process. Laying by combining horizontal and vertical methods gives full play to the respective performances of the two types of drainage boards, with good overall structural stability, good vacuum degree transfer effect of the structure, fast drainage rate, and larger settlement amount.

[0019] The drainage board system 6 includes a plurality of first drainage boards 7, which are arranged at equal intervals. The distance between adjacent first drainage boards 7 is 80 cm. Adjacent first drainage boards 7 are fixed by iron wires. Both ends of the first drainage board 7 are provided with hand-shaped joints 8. The hand-shaped joints 8 are sequentially connected in conduction with the first joint pipes 9 on both sides of the first drainage board 7. The first joint pipes 9 are collectively connected to the corresponding second joint pipes 10. Geotextiles 11 are laid on both the upper and lower layers of the arranged and fixed first drainage boards 7. The four sides of the upper and lower layer geotextiles 11 are hermetically connected. One end of the second joint pipe 10 is placed inside the geotextile and is in conduction with the first joint pipe 9, and the other end of the second joint pipe 10 extends out of the geotextile 11. The drainage board wrapped with geotextile has a longer service life, can effectively reduce the entry of particles into the drainage board, thereby reducing the drainage rate. The use of an integral drainage board system can keep the drainage boards in each layer or each column always on the same plane, and the overall structure is stable, avoiding the adverse effects caused by the bending or breakage of the drainage board. The layout form is also much simpler, reducing a large amount of manpower and material resources;

[0020] The second joint pipes 10 on both sides of the horizontal drainage board system are connected to elbow pipes 12. The two sides of the horizontal drainage board system 3 are respectively connected in conduction with the vertical drain pipes 5 on both sides through the elbow pipes 12. The distances between adjacent horizontal drainage board systems 3 are equal. The distance between the upper and lower adjacent horizontal drainage board systems 3 is 40 cm. The second joint pipes 10 on both sides of the horizontal drainage board system are connected to elbow pipes 12. The elbow pipes are connected to drain pipes 13. The upper and lower sides of the vertical drainage board system 4 are respectively connected in conduction with the vertical drain pipes 5 on both sides through the drain pipes 13. The distances between adjacent vertical drainage board systems 4 are equal. The distance between each column of vertical drainage board systems 4 is 100 cm. The distance between the bottom of the vertical drainage board system 4 and the outermost horizontal drainage board system 3 is 20 cm.

[0021] A plurality of second drainage boards 14 are vertically inserted into the four peripheral edges of the preloading groove 1. The distance between adjacent second drainage boards 14 is 100 cm. The outside of the second drainage board 14 is wrapped with geotextile. The end of the second drainage board 14 is provided with a third joint pipe 15. The third joint pipe 15 is sequentially connected in conduction with the branch pipes 16. The ends of the branch pipes 16 are connected in conduction with the vertical drain pipe 5. A small part of the silt in the lower layer of the preloading groove leaks out to the surrounding during the evacuation and consolidation process. The second drainage board can evacuate and drain water, which can prevent the leakage of the surrounding of the horizontal drainage board laid in the lower layer and thus affect the drainage effect. The combination of the vertical drainage board system, the horizontal drainage board system and the second drainage board enhances the drainage effect.

[0022] The method for treating engineering waste mud by a horizontal-vertical double-layer drainage board vacuum preloading system is as follows. The operation steps are as follows.

[0023] (1) First, prepare the drainage board system 6 in advance. Arrange and fix multiple first drainage boards 7 at equal intervals, with a spacing of 80 cm between adjacent first drainage boards 7. Hand-shaped joints 8 are connected to both ends of each first drainage board 7. The hand-shaped joints 8 on both sides are respectively conductively connected to the first joint pipes 9 on both sides of the first drainage board 7 in sequence. Both first joint pipes 9 on both sides are conductively connected to a second joint pipe 10. Geotextiles 11 are laid on both the upper and lower layers of the arranged and fixed first drainage boards 7. The four sides of the geotextiles 11 on the upper and lower layers are hermetically connected. One end of the second joint pipe 10 is placed inside the geotextile 11 and conductively connected to the first joint pipe 9, and the other end of the second joint pipe 10 extends out of the geotextile.

[0024] (2) Convey mud into the preloading trough 1. When the height of the mud surface reaches 40 cm, horizontally lay the first layer of horizontal drainage board system 3. Continue to convey mud. When the mud covers the geotextile of the first layer of horizontal drainage board system 3, conductively connect the second joint pipes 10 at both ends of the first layer of horizontal drainage board system 3 to the vertical drainage pipe 5 through elbow pipes 12, and immediately evacuate, while continuing to convey mud into the preloading trough 1.

[0025] (3) When the height of the second layer of mud reaches 40 cm, lay the second layer of horizontal drainage board system 3. Continue to convey mud. When the mud covers the geotextile of the second layer of horizontal drainage board system 3, conductively connect the second joint pipes at both ends of the second layer of horizontal drainage board system 3 to the vertical drainage pipe 5 through elbow pipes 12, and immediately evacuate, while continuing to convey mud into the preloading trough 1.

[0026] (4) Repeat the above operations. As the mud synchronously sinks while being vacuumed, until the mud covers up to a height of 2 m in the preloading trough, lay the last layer of horizontal drainage board system 3 and seal it with the first layer of sealing film 17. The lower layer of the preloading trough forms an integral body, and then evacuate. Laying horizontal drainage boards in the lower layer and starting to vacuum earlier can enable the mud in the lower layer to start consolidating earlier, increase the mud settlement amount earlier, and thus increase the total conveying volume of the entire mud pond, saving money and reducing energy consumption.

[0027] (5) Continue to convey mud until the mud covers up to a position 80 cm remaining from the top of the preloading trough 1. Insert multiple vertical drainage board systems 4 into the remaining 80 cm high trough of the preloading trough 1. The multiple vertical drainage board systems 4 are arranged horizontally, and the spacing between adjacent vertical drainage board systems 4 is equal, with a spacing of 100 cm between adjacent vertical drainage board systems 4. There is a 20 cm interval between the bottom of the vertical drainage board and the last layer of horizontal drainage board system 3.

[0028] (6) The upper and lower sides of the vertical drainage board system 4 are respectively conductively connected to the drainage pipes 13 through elbow pipes 12, and the two drainage pipes 13 are conductively connected to the vertical drainage pipes 5 on both sides.

[0029] (7) Vertically insert multiple second drainage boards 14 along the four peripheral edges of the preloading groove 1. The bottom of the second drainage board is inserted to the bottom of the preloading groove. The spacing between adjacent second drainage boards 14 is 100 cm. The outside of the second drainage board 14 is wrapped with geotextile. The end of the second drainage board 14 is provided with a third joint pipe 15, and the third joint pipe 15 is conductively connected to the branch pipe 16 in sequence. The end of the branch pipe 16 is conductively connected to the vertical drainage pipe 5. The second drainage board can prevent air leakage around the horizontal drainage board laid in the lower layer, thus affecting the drainage effect;

[0030] (8) Continue to transport the slurry until it reaches the top of the slurry pond, then lay another layer of geotextile 11 and the sealing film 17, and immediately carry out vacuum pumping.

[0031] When laying the horizontal drainage board system in the lower layer of the preloading groove, vacuum pumping is carried out while laying, which can enable the lower-layer slurry to start consolidating earlier, increase the slurry settlement amount earlier, and then increase the total transportation volume of the entire slurry pond, saving money and reducing energy consumption. Carrying out evacuation while laying can save 1 / 3 - 1 / 2 of the construction period and reduce the cost by 1 / 4 - 1 / 3, with better economic benefits and broad application prospects. After the horizontal drainage board system is laid, it is sealed with a sealing film, and then the upper vertical drainage board is laid. The laying of the lower horizontal drainage board can rapidly expand the slurry pond under the pressure of the upper soil weight, increasing the drainage volume and drainage rate. The laying of the upper vertical drainage board solves the problem of surface drainage. The form of separate vacuum pumping for the upper and lower layers can make full use of the clear water generated during the vacuum pumping process, and arrange a reasonable construction drainage system to reuse the drained water.

[0032] Refer to Figures 1 - 5 As shown in the figure, the horizontal-vertical upper and lower double-layer drainage board vacuum preloading system described in Embodiment 2 of the present invention is basically the same as Embodiment 1, except that: multiple holes are reserved in the geotextiles 11 of the upper and lower layers in the last layer of the horizontal drainage board system, and the vertical drainage board system 4 is vertically inserted and passes through the outermost horizontal drainage board 3 system to form a cross arrangement structure.

[0033] The method for treating engineering waste slurry by the horizontal-vertical upper and lower double-layer drainage board vacuum preloading system in Embodiment 2 has the following operating steps.

[0034] (1)Pre-prepare the drainage board system 6, arrange and fix multiple first drainage boards 7 at equal intervals, with a spacing of 80 cm between adjacent first drainage boards 7. Hand-shaped joints are connected to both ends of each first drainage board. The hand-shaped joints on both sides are sequentially connected in a conducting manner to the first joint pipes 9 on both sides of the first drainage board. Both first joint pipes 9 on both sides are connected in a conducting manner to a second joint pipe 10. Geotextiles 11 are laid on both the upper and lower layers of the first drainage boards 7 after arrangement and fixation. The four sides of the upper and lower geotextiles 11 are hermetically connected. One end of the second joint pipe 10 is placed inside the geotextile and connected in a conducting manner to the first joint pipe 9, and the other end of the second joint pipe 10 extends outside the geotextile;

[0035] (2)Convey mud into the preloading groove 1. When the height of the mud surface reaches 40 cm, horizontally lay the first layer of horizontal drainage board system 3. Continue to convey mud. When the mud covers the geotextile of the first layer of horizontal drainage board system 3, connect the second joint pipes 10 at both ends of the first layer of horizontal drainage board system to the vertical drain pipe 5 through elbow pipes 12, and immediately evacuate, while continuing to convey mud into the preloading groove 1;

[0036] (3)When the height of the second layer of mud reaches 40 cm, lay the second layer of horizontal drainage board system 3. Continue to convey mud. When the mud covers the geotextile of the second layer of horizontal drainage board system 3, connect the second joint pipes 10 at both ends of the second layer of horizontal drainage board system to the vertical drain pipe 5 through elbow pipes 12, and immediately evacuate, while continuing to convey mud into the preloading groove 1;

[0037] (4)Repeat the above operations. As the mud sinks synchronously while vacuuming, until the mud covers up to a height of 2 m in the preloading groove, lay the last layer of horizontal drainage board system 3. Multiple holes are reserved in the upper and lower geotextiles of the last layer of horizontal drainage board system 3, and the holes are located at the gaps between adjacent first drainage boards within the drainage board system;

[0038] (5)Vertically insert multiple vertical drainage board systems 4 into the preloading groove. The bottom of the vertical drainage board system 4 is inserted into the holes reserved in the last layer of horizontal drainage board system and passes through 20 cm below the bottom of the last layer of horizontal drainage board system 3. The vertically inserted drainage board system and the last layer of horizontal drainage board system form a cross-layout structure;

[0039] (6)The upper and lower sides of the vertical drainage board system 4 are respectively connected in a conducting manner to the drain pipe 13 through elbow pipes 12, and the two drain pipes 13 are connected in a conducting manner to the vertical drain pipes 5 on both sides;

[0040] (7) Vertically insert a plurality of second drainage boards 14 around the periphery of the preloading groove 1, with a spacing of 100 cm between adjacent second drainage boards 14. The outside of the second drainage boards 14 is wrapped with geotextile. The end of the second drainage board 14 has a third joint pipe 15, and the third joint pipe 15 is conductively connected to the branch pipe 16 in sequence. The end of the branch pipe 16 is conductively connected to the vertical drainage pipe 5. The second drainage board can prevent air leakage around the horizontal drainage board laid in the lower layer, thus affecting the drainage effect;

[0041] (8) Continue to transport the slurry until it reaches the top of the slurry pond, then lay another layer of geotextile 11 and sealing film 13, and immediately carry out vacuum pumping until consolidation is completed.

[0042] The embodiments should not be regarded as limitations of the present invention. Any improvement based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A method for treating engineering waste mud by a horizontal-vertical double-layer drainage board vacuum preloading system, characterized in that: It includes a vacuum preloading system, which consists of a preloading tank, a vacuum pump, multiple horizontal drainage board systems, and multiple vertical drainage board systems. Both side walls of the preloading tank are provided with vertical drain pipes. Multiple horizontal drainage board systems are laid on the lower layer of the preloading tank. Both sides of the horizontal drainage board systems are respectively connected to the vertical drain pipes on both sides through elbow pipes. Multiple vertical drainage board systems are laid on the upper layer of the preloading tank. The upper and lower sides of the vertical drainage board systems are respectively connected to the vertical drain pipes on both sides through drain pipes. One vacuum pump is respectively connected to the ends of the vertical drain pipes on both sides; The operating steps of the vacuum preloading system for treating engineering waste mud are as follows: (1) First, prepare the drainage board system in advance. Arrange and fix multiple first drainage boards at equal intervals. The distance between adjacent first drainage boards is 80 cm. Hand-shaped joints are connected to both ends of each first drainage board. The hand-shaped joints on both sides are respectively connected to the first joint pipes on both sides of the first drainage board in sequence. Both first joint pipes are connected to a second joint pipe. Geotextiles are laid on the upper and lower layers of the arranged and fixed first drainage boards. The four sides of the upper and lower geotextiles are hermetically connected. One end of the second joint pipe is placed inside the geotextile and connected to the first joint pipe, and the other end of the second joint pipe extends outside the geotextile; (2) Convey mud into the preloading tank. When the height of the mud surface reaches 40 cm, lay the first layer of the horizontal drainage board system horizontally. Continue to convey mud. When the mud covers the geotextile of the first layer of the horizontal drainage board system, connect the second joint pipes at both ends of the first layer of the horizontal drainage board system to the vertical drain pipes through elbow pipes, and immediately evacuate. At the same time, continue to convey mud into the preloading tank; (3) When the height of the second layer of mud reaches 40 cm, lay the second layer of the horizontal drainage board system. Continue to convey mud. When the mud covers the geotextile of the second layer of the horizontal drainage board system, connect the second joint pipes at both ends of the second layer of the horizontal drainage board system to the vertical drain pipes through elbow pipes, and immediately evacuate. At the same time, continue to convey mud into the preloading tank; (4) Repeat the above operations. As the mud sinks synchronously while pumping vacuum, until the mud covers a height of 2 m in the preloading tank, lay the last layer of the horizontal drainage board system and seal it with the first layer of sealing film, and then evacuate. At the same time, continue to convey mud; (5) Cover the mud to a position 80 cm remaining from the top of the preloading tank. Insert multiple vertical drainage board systems into the remaining 80 cm high tank of the preloading tank. The multiple vertical drainage board systems are arranged horizontally. The distance between adjacent vertical drainage board systems is equal. The distance between each column of vertical drainage board systems is 100 cm. There is a 20 cm interval between the bottom of the vertical drainage board system and the last layer of horizontally laid drainage board system; (6) The upper and lower sides of the vertically laid drainage board system are respectively connected to the drain pipes through elbow pipes. The two drain pipes are connected to the vertical drain pipes on both sides; (7) Vertically insert multiple second drainage boards along the four peripheries of the preloading trench, with a spacing of 100 cm between adjacent second drainage boards. The outer sides of the second drainage boards are wrapped with geotextiles. The ends of the second drainage boards are provided with third connecting pipes, and the third connecting pipes are sequentially connected in a conducting manner with branch pipes. The ends of the branch pipes are connected in a conducting manner with vertical drainage pipes; (8) Continue to transport the slurry until it reaches the top of the slurry pit, then lay another layer of geotextile and sealing film, and immediately carry out vacuum pumping.

2. The method for treating engineering waste mud by the horizontal-vertical double-layer drainage board vacuum preloading system according to claim 1, characterized in that: Multiple horizontal drainage board systems are arranged longitudinally, and the spacing between adjacent upper and lower horizontal drainage board systems is 40 cm.

3. The method for treating engineering waste mud by the horizontal-vertical double-layer drainage board vacuum preloading system according to claim 2, characterized in that Multiple vertical drainage board systems are arranged horizontally, and the spacing between each column of vertical drainage board systems is 100 cm.

4. The method for treating engineering waste mud by the horizontal-vertical double-layer drainage board vacuum preloading system according to claim 2 or 3, characterized in that Vertically insert multiple second drainage boards along the four peripheries of the preloading trench, with a spacing of 100 cm between adjacent second drainage boards. The outer sides of the second drainage boards are wrapped with geotextiles. The ends of the second drainage boards are provided with third connecting pipes, and the third connecting pipes are sequentially connected in a conducting manner with branch pipes. The ends of the branch pipes are connected in a conducting manner with vertical drainage pipes.

5. The method for treating engineering waste mud by the horizontal-vertical double-layer drainage board vacuum preloading system according to claim 1 or 2, characterized in that The depth of the preloading trench is greater than 3 meters.

6. The method for treating engineering waste mud by the horizontal-vertical double-layer drainage board vacuum preloading system according to claim 5, characterized in that The spacing between the bottom of the vertical drainage board system and the outermost horizontal drainage board system is 20 cm.

7. The method for treating engineering waste mud by the horizontal-vertical double-layer drainage board vacuum preloading system according to claim 6, characterized in that The vertical drainage board system vertically inserts and passes through the outermost horizontal drainage board system to form a cross arrangement structure.

8. A method for treating engineering waste mud by a horizontal-vertical double-layer drainage board vacuum preloading system, characterized in that: It includes a vacuum preloading system. The vacuum preloading system includes a preloading trench, vacuum pumps, multiple horizontal drainage board systems, and multiple vertical drainage board systems. Both side walls of the preloading trench are provided with vertical drainage pipes. Multiple horizontal drainage board systems are laid on the lower layer of the preloading trench. The two sides of the horizontal drainage board system are respectively connected in a conducting manner with the vertical drainage pipes on both sides through elbow pipes. Multiple vertical drainage board systems are laid on the upper layer of the preloading trench. The upper and lower sides of the vertical drainage board system are respectively connected in a conducting manner with the vertical drainage pipes on both sides through drainage pipes. One vacuum pump is respectively connected to the ends of the vertical drainage pipes on both sides; The operation steps of the vacuum preloading system for treating engineering waste slurry are as follows: (1) Prepare the drainage board system in advance. Arrange and fix multiple first drainage boards at equal intervals, with a spacing of 80 cm between adjacent first drainage boards. First connecting pipes are provided on both sides of the first drainage boards. Hand-shaped connectors are connected to both ends of each first drainage board. The hand-shaped connectors on both sides are sequentially connected in a conducting manner with the first connecting pipes. Second connecting pipes are connected in a conducting manner to both first connecting pipes. Geotextiles are laid on the upper and lower layers of the first drainage boards after being arranged and fixed. The four sides of the upper and lower geotextiles are hermetically connected. One end of the second connecting pipe is placed inside the geotextile and connected in a conducting manner with the first connecting pipe, and the other end of the second connecting pipe extends outside the geotextile; (2) Transport the slurry into the preloading trench. When the height of the slurry surface reaches 40 cm, horizontally lay the first layer of horizontal drainage board system. Continue to transport the slurry. When the geotextile of the first layer of horizontal drainage board system is covered by the slurry, connect the second connecting pipes at both ends of the first layer of horizontal drainage board system to the vertical drainage pipes through elbow pipes, and immediately carry out evacuation. At the same time, continue to transport the slurry into the preloading trench; When the height of the second layer of mud reaches 40 cm, lay the second layer of horizontal drainage board system, and continue to transport the mud. When the mud covers the geotextile of the second layer of horizontal drainage board system, connect the second joint pipes at both ends of the second layer of horizontal drainage board system to the vertical drainage pipe through elbows, immediately evacuate, and at the same time continue to transport the mud to the preloading tank; (4)Repeat the above operations. As the mud sinks synchronously with the vacuum pumping, until the mud covers the preloading tank to a height of 2 m, lay the last layer of horizontal drainage board system. Multiple holes are reserved in the upper and lower geotextiles of the last layer of horizontal drainage board system, and the holes are located at the gaps between adjacent drainage boards within the drainage board system; (5)Vertically insert multiple vertical drainage board systems into the preloading tank. The bottom of the vertical drainage board system is inserted into the holes reserved in the last layer of horizontal drainage board system and passes through 20 cm below the bottom of the last layer of horizontal drainage board system. The vertically inserted drainage board system and the last layer of horizontal drainage board system form a cross-layout structure; (6)The upper and lower sides of the vertical drainage board system are respectively connected to the drainage pipes through elbows, and the two drainage pipes are connected to the vertical drainage pipes on both sides; (7)Vertically insert multiple second drainage boards at the four edges of the preloading tank. The spacing between adjacent second drainage boards is 100 cm. The outside of the second drainage board is wrapped with geotextile. The end of the second drainage board has a third joint pipe, and the third joint pipe is sequentially connected to the branch pipe, and the end of the branch pipe is connected to the vertical drainage pipe; (8)Continue to transport the mud until it reaches the top of the mud pool, then lay another layer of geotextile and sealing film, and then vacuum pumping can be carried out.

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