Rapid land reclamation and solidification treatment system in offshore cofferdam through hydraulic reclamation of mud and sand and implementation method of rapid land reclamation and solidification treatment system

Abstract

The invention discloses a rapid land making and solidifying treatment system for offshore hydraulic reclamation mud and sand and an implementation method. The rapid land making and solidifying treatment system comprises a cofferdam, a screening system, a hydraulic reclamation mud stirring bin, a hydraulic reclamation sand stirring bin and a drainage system. According to the implementation method, the screened hydraulic reclamation mud and the screened hydraulic reclamation sand are solidified and conveyed to different areas in the cofferdam, after the requirement is met, the conveying pipe head of the hydraulic reclamation mud and the conveying pipe head of the hydraulic reclamation sand are exchanged, and the solidified hydraulic reclamation mud and sand layered foundation is formed. On the basis of a drainage path and a vertical filter screen pipe of solidified hydraulic reclamation sand, a drainage pipe and a suction pump are adopted, and redundant water generated during hydraulic reclamation and after hydraulic reclamation is rapidly drained out in time. And after the filter pipe is pulled out and recycled in the later period, cement soil slurry is injected into a formed hole, and a foundation structure with a transverse solidified mud sand layer and a vertical solidified soil pile is formed. According to the implementation method, solidification can be carried out while hydraulic reclamation is carried out, hydraulic reclamation of mud and sand is continuously carried out, the foundation strength is rapidly improved, a stable and reliable foundation structure is formed, meanwhile, the construction period is shortened, and on-site utilization of filter sand and material recovery are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of land reclamation schemes and foundation treatment, and relates to a rapid land reclamation and solidification treatment system for sand filled by blowing in an offshore cofferdam and an implementation method. Background Art

[0002] The existing methods of offshore land reclamation include "blowing fill + fluidized solidification". The larger sand particles are screened out from the seabed mud and sand through a screening device, and then a certain proportion of cement and other curing agent materials and sufficient water are added. After stirring evenly, based on the fluidity of the fluidized solidified blown fill mud, the mixture is blown to the target site to form a relatively flat land. This method uses cement hydration reaction to strengthen the soil and increase the bearing capacity of the foundation. Compared with sand and gravel filling and blown fill preloading, it saves transportation costs and material costs, reduces the construction period, and is a more economical and environmentally friendly method of land reclamation.

[0003] There are still some unresolved issues with this method. First, there is an obvious contradiction between the fluidity required for filling with fluidized solidified mud and the weakening of the solidified soil strength by high water content. Large-area filling and solidification requires high fluidity of the filled solidified mud, and therefore an ultra-high water content must be ensured. The water content of the dredged seabed silt is generally 200-500%. When the water content of the silt sucked from suction is low, in order to ensure the uniformity of the filled land, water is often needed to increase the fluidity of the fluidized solidified soil when the solidifying agent is added to the silt and stirred. However, a high water content is very unfavorable to the strength of the solidified soil. The filled mud, which has a very high water content, has an even higher water content after adding water, which is very unfavorable to the enhancement of the foundation strength in the later stage. Second, the fluidized solidified mud has an ultra-high porosity ratio, which is bound to become an unfavorable factor affecting the stability of the foundation in the later stage. Under the filling and cementing action of hydration products, soil particles temporarily form a structure with certain strength and stability. However, the cement hydration reaction consumes limited water. After the ultra-high moisture content blown fill mud is solidified, there is still 70-80% water in the soil. If part of the hydrated water cannot be discharged in time, when the subsequent equipment enters the site or under the long-term load of the upper structure, once the stress yield state is reached, the foundation will produce large settlement in a short period of time or even be directly destroyed. Third, the blown fill mud has low permeability and slow drainage. After adding cement, it is conducive to the sandification of the soil, thereby increasing the permeability and drainage. Before the soil strength is significantly enhanced, some water can be squeezed out under low pressure. However, the construction period of blown fill solidification is long. If the loading and compaction method is used after the construction is completed, the problems of long seepage path and increased soil strength will affect the effectiveness of the method; Fourth, before the flow state solidification of the blown fill mud, large particles of gravel must be screened out. These blown fill sands are accompanied by some small particles of soil, which are usually directly piled and abandoned, causing waste of resources and environmental pollution. Summary of the invention

[0004] Objective of the Invention: The objective of the present invention is to provide a rapid land reclamation and solidification treatment system and implementation method for dredged sediment within a sea cofferdam, aiming to solve problems such as insufficient fluid-solidification strength, excessive porosity, and waste of dredged sand resources.

[0005] Technical Solution: A rapid land reclamation and solidification treatment system for dredged sediment at sea in the present invention includes a cofferdam, a screening system, a dredged mud mixing bin, a dredged sand mixing bin, and a drainage system; the dredged mud mixing bin and the dredged sand mixing bin are respectively connected to the screening system through material conveying pipes, the dredged mud mixing bin is used to receive the silt screened out by the screening system, and the dredged sand mixing bin is used to receive the dredged sand screened out by the screening system; a silt grouting pipe is connected to the dredged mud mixing bin, a sand grain grouting pipe is connected to the dredged sand mixing bin, a dredged mud conveying pipe head is arranged below the dredged mud mixing bin, a dredged sand conveying pipe head is arranged below the dredged sand mixing bin, and the discharge positions of the dredged mud conveying pipe head and the dredged sand conveying pipe head are adjustable; the drainage system includes filter mesh pipes, drain pipes, a suction pump, and a main drain pipe, there are several filter mesh pipes, several of the filter mesh pipes are vertically arranged within the cofferdam, the drain pipes are placed within the filter mesh pipes, several of the drain pipes are connected to the main drain pipe, and the main drain pipe is connected to the suction pump.

[0006] Further, the upper and lower ends of the filter mesh pipes have threaded joints and can be sleeved and lengthened according to the filling depth.

[0007] Further, the bottom of the filter mesh pipe is sleeved with a threaded socket to prevent soil from entering the pipe after it is inserted into the filling area.

[0008] Further, the dredged mud mixing bin is fixedly connected to the silt grouting pipe with threaded bolts, and the dredged sand mixing bin is fixedly connected to the sand grain grouting pipe with threaded bolts.

[0009] The present invention provides a rapid land reclamation and solidification treatment implementation method for dredged sediment at sea, which adopts the above-mentioned rapid land reclamation and solidification system for dredged sediment at sea and includes the following steps:

[0010] 1) Determine the size of the cofferdam, divide the filling area, and determine the quantity and position of the vertical filter mesh pipes arranged.

[0011] 2) Seal one end of the filter mesh pipe and vertically insert it into the designated position, place the drain pipe into the metal filter mesh pipe, connect all the drain pipes to the main drain pipe, and connect the main drain pipe to the suction pump.

[0012] 3) Connect the dredged mud mixing bin and the dredged sand mixing bin to the left and right ends of the screening system respectively through material conveying pipes, and fixedly connect the grouting pipes to the corresponding mixing bins.

[0013] 4) Discharge the dredged silt into the screening system. After screening, the silt is transported to the dredged silt mixing silo, where it is mixed and stirred with the cement slurry to obtain fluidized solidified silt. The screened dredged sand is transported to the dredged sand mixing silo for cement mixing and stirring. After stirring, the fluidized solidified silt obtained from the dredged silt mixing silo is transported through a pipeline to the predetermined dredging area. At the same time, the mixture obtained from the dredged sand mixing silo is transported to the adjacent area of the fluidized solidified silt;

[0014] 5) After the fluidized solidified silt is dredged to a certain depth, swap the dredging positions of the dredged silt delivery pipe head and the dredged sand delivery pipe head and continue dredging, thereby forming stacked solidified dredged silt layers and solidified dredged sand layers;

[0015] 6) Repeat step 5) in this way until the target elevation is dredged, thereby forming layered solidified dredged silt layers and solidified dredged sand layers. During the process, the water in the filter pipe is discharged outside the dredging area through a suction pump and a main drain pipe;

[0016] 7) After the solidified land reclamation is completed and the water is completely discharged, pull out the filter pipe and remove the drain pipe for recycling. At the same time, inject cement slurry or cement-soil slurry into the holes formed by pulling out the filter pipe to form cement-soil columns for strengthening the foundation. Finally, lay a cushion layer on the ground surface.

[0017] Further, the specific implementation method of step 2) includes:

[0018] 2.1) The filter pipe is sleeved and lengthened according to the dredging depth. After sleeving, the bottom is covered with a socket, and the drain pipe penetrates through the filter pipe;

[0019] 2.2) First, dredge the fluidized solidified silt to a certain thickness. After its strength is enhanced, use a working ship to insert the filter pipes into the designated positions at intervals;

[0020] 2.3) The drain pipes in each filter pipe are interconnected and connected to the main drain pipe.

[0021] Further, when dredging the solidified dredged sand layer in step 5), the position of the dredged sand delivery pipe head is preferably placed between the filter pipes. The reason for this is that the dredged sand has low fluidity. Placing the dredged sand delivery pipe head in one place for dredging is not conducive to uniformity. It is necessary to manually intervene in the discharge position of the dredged sand delivery pipe head according to the actual working conditions. Since the drainage path in the middle of the filter pipe is long, placing it between the filter pipes is more conducive to the discharge of excess water with a long seepage path.

[0022] Further, the mass ratio of the mixture in the dredged silt mixing silo is dredged silt: curing agent: water = 8 - 15:1:0 - 1, and the mixture ratio in the dredged sand mixing silo is dredged sand: curing agent: water = 15 - 20:1:0 - 1.

[0023] Further, in the step 5), the depth of the solidified hydraulic fill mud layer is 8 - 12 cm, and the depth of the solidified hydraulic fill sand layer is not less than 2 cm.

[0024] Further, in the step 7), the mixture ratio for preparing the cement soil column is mud and sand: curing agent = 6 - 10:1.

[0025] Beneficial effects: Compared with the prior art, the present invention has the following remarkable advantages: (1) The present invention can rapidly reduce the water content and increase the strength, reducing the settlement risk in the later operation. By using the drainage paths of the filter screen pipes and the hydraulic fill sand, part of the water at the beginning of the hydraulic fill of the fluidized solidified hydraulic fill mud, as well as the water squeezed out under the continuous superposition of soil layers later, can be discharged out of the hydraulic fill area quickly, stably and in a timely manner; (2) The present invention can perform hydraulic filling, drainage and solidification simultaneously, continuously carry out the construction of hydraulic fill mud and sand, and does not need to wait for the later drainage consolidation period or until 28 days after the solidification period to carry out the next step of construction, saving the construction period; (3) It can realize the local recycling of the filter sand, solving the problems of stacking and discarding of the hydraulic fill sand grains; (4) The filter screen pipes and the drain pipes can be reused, and no useless materials and structures are left in the bearing foundation formed by this scheme to prevent additional settlement in the later stage; (5) When filling, the fluidity of the fluidized solidified soil is used to achieve the purpose of uniform foundation. After filling, the water is quickly discharged to increase the foundation strength. At the same time, the later poured cement soil column with higher strength can form a stable foundation with high bearing performance similar to the "solidified soil + solidified soil pile structure". Description of the Drawings

[0026] Figure 1 is the top view of the present invention;

[0027] Figure 2 is the sectional schematic diagram of the present invention;

[0028] Figure 3 is the bottom layout of the filter screen pipe of the present invention

[0029] Figure 4 is the foundation structure finally formed by the present invention

[0030] In the figure: 1, cofferdam; 2, screening system; 31, silt grouting pipe; 32, sand grain grouting pipe; 41, hydraulic fill mud mixing bin; 42, hydraulic fill sand mixing bin; 5, material conveying pipe; 6, drain pipe; 7, suction pump; 8, main drain pipe; 9, filter screen pipe; 91, socket; 10, solidified hydraulic fill mud layer; 11, solidified hydraulic fill sand layer; 12, cement soil column; 13, cushion layer. Detailed Embodiments

[0031] The following further describes the processing implementation method of the present invention in conjunction with the accompanying drawings and specific embodiments, but the present invention is not limited to these specific embodiments. For those skilled in the art, other measures and non-innovative improvements made without departing from the concept of the present invention fall within the protection scope of the present invention.

[0032] As Figures 1-4 shown, the present invention of this embodiment is a rapid land reclamation and solidification treatment system for marine dredged sediment, including a cofferdam 1, a screening system 2, a dredged mud mixing bin 41, a dredged sand mixing bin 42 and a drainage system. The dredged mud mixing bin 41 and the dredged sand mixing bin 42 are respectively connected to the left and right ends of the screening system 2 through a material conveying pipe 5. A silt grouting pipe 31 is fixedly connected to the dredged mud mixing bin 41 through a threaded bolt. A dredged mud conveying pipe head is arranged below the dredged mud mixing bin 41. A sand grouting pipe 32 is fixedly connected to the dredged sand mixing bin through a threaded bolt. A dredged sand conveying pipe head is arranged below the dredged sand mixing bin 42. The discharge positions of the dredged mud conveying pipe head and the dredged sand conveying pipe head are adjustable. The drainage system includes a filter screen pipe 9, a drain pipe 6, a suction pump 7 and a main drain pipe 8. There are several filter screen pipes 9, and several filter screen pipes 9 are vertically arranged in the cofferdam 1. The drain pipe 6 is placed in the filter screen pipe 9. Several drain pipes 6 are connected to the main drain pipe 8. The main drain pipe 8 is connected to the suction pump 7. The excess water in the fluidized solidified dredged mud is discharged out of the filling area through the suction pump 7. The filter screen pipe 9 can be recycled later. The pipe holes left after recycling are injected with cement slurry / cement-soil slurry to form cement-soil columns 12, and finally a cushion 13 is laid.

[0033] In a specific embodiment, the filter screen pipes 9 can be arranged at intervals of 10 - 20 meters. The drain pipes 6 in each column of filter screen pipes 9 are interconnected and then connected to the main drain pipe 8. The upper and lower ends of the filter screen pipe 9 have threaded joints and can be sleeved and lengthened according to the filling depth. The bottom of the filter screen pipe 9 is threaded with a socket 91 to prevent soil from entering the pipe after it is inserted into the filling area.

[0034] This embodiment is a rapid land reclamation and solidification treatment implementation method for marine dredged sediment, specifically including the following steps:

[0035] 1) Determine the size of the cofferdam 1, conduct measurement and positioning, divide the filling area, and determine the arrangement quantity and position of the vertical filter screen pipes 9;

[0036] 2) As Figure 1 , one end of the filter screen pipe 9 is sealed with a socket 91 and vertically inserted into the specified position. The drain pipe 6 is placed in the filter screen pipe 9. The drain pipes 6 are horizontally connected to each other to the main drain pipe 8. The main drain pipe is connected to the suction pump 7. The horizontally connected drain pipes 6 are fixed on the cofferdam 1;

[0037] 3) After step 2) is completed, as Figure 2, connect the material conveying pipe 5 to the screening system 2, the dredged fill mud mixing bin 41, and the dredged fill sand mixing bin 42. The silt grouting pipe 31 is fixedly connected to the dredged fill mud mixing bin 41, and the sand particle grouting pipe 32 is fixedly connected to the dredged fill sand mixing bin 42;

[0038] 4) After completing the installation steps in step 3), start the dredged fill construction step. Discharge the dredged silt into the screening system 2. The small particle silt after screening is transported through the material conveying pipe 5 to the dredged fill mud mixing bin 41 connected to the silt grouting pipeline 31 for mixing; at the same time, the large particle dredged fill sand after screening is transported to the dredged fill sand mixing bin 42 connected to the sand particle grouting pipe 32 for mixing; after mixing, the mixture in the dredged fill mud mixing bin 41 is transported to the predetermined dredged fill area through the dredged fill mud conveying pipe head. At the same time, the mixture in the dredged fill sand mixing bin 42 is transported to the adjacent area through the dredged fill sand conveying pipe head;

[0039] 5) After the fluidized solidified mud is dredged to a certain depth, interchange the dredged fill mud conveying pipe head and the dredged fill sand conveying pipe head for the dredged fill position and continue dredging, thereby forming the solidified dredged fill mud layer 10 and the solidified dredged fill sand layer 11;

[0040] 6) Repeat step 5) in this way until dredging reaches the target elevation, thereby forming the layered solidified dredged fill mud layer 10 and the solidified dredged fill sand layer 11. The fluidized solidified mud first flows and then stabilizes, and part of the water will enter the filter pipe 9; in addition, as the solidified mud and sand layer accumulates continuously, under the action of gravity extrusion, the water in the solidified dredged fill mud layer 10 will seep into the solidified dredged fill sand layer 11 and flow into the filter pipe 9; during the process, the water in the filter screen pipe 9 is discharged outside the dredged fill area through the suction pump 7 and the main drain pipe 8;

[0041] 7) After the solidified dredged fill land reclamation is completed and the water is completely discharged, the ground strength has basically met the normal construction conditions. Pull out the filter screen pipe 9, remove the drain pipe 6 for recycling; at the same time, inject cement slurry or cement-soil slurry into the hole formed by pulling out the filter screen pipe 9 to form the cement-soil column 12 to further reinforce the foundation, and finally lay the cushion 13. As Figure 4 , a layered solidified dredged fill mud and sand + solidified soil column foundation structure is formed inside the cofferdam 1, and this structure has higher bearing capacity and stability.

[0042] In a specific embodiment, the implementation method of step 2) adopted by the present invention is:

[0043] 2.1) The upper and lower ends of the filter screen pipe 9 have threaded joints, which can be sleeved and lengthened according to the dredged fill depth. After sleeving, the bottom is sleeved with the socket 91 thread to prevent the soil from entering the pipe after being inserted into the dredged fill area. Place the drain pipe 6 into the filter screen pipe 9 until the bottom of the filter screen pipe 9;

[0044] 2.2) Use a working ship to insert the filter screen pipes 9 at intervals of 10 to 20 meters into the designated positions. If the filter screen pipes 9 cannot stand upright, the solidified fill mud can be first filled to a certain thickness, and then inserted into the designated positions after the strength is enhanced;

[0045] 2.3) The drain pipes 6 inside each filter screen pipe 9 are interconnected and connected to the main drain pipe 8, and a suction pump 7 is used to drain the excess water during the fill construction process.

[0046] In a specific embodiment, when filling and solidifying the fill sand layer 11 in step 5), the position of the fill sand delivery pipe head is preferably placed between the filter screen pipes 9. The reason for this is that the fill sand has low fluidity, and it is not conducive to uniformity if the fill sand delivery pipe head is always placed in one place for filling. It is necessary to manually intervene in the discharge position of the fill sand delivery pipe head according to the actual working conditions. Since the drainage path in the middle of the filter screen pipes 9 is long, placing it between the filter screen pipes 9 is more conducive to the discharge of excess water with a long seepage path.

[0047] In a specific embodiment, the depth of the solidified fill mud layer 10 in step 5) is 8 - 12 cm, and the solidified fill sand layer 11 is determined according to the proportion of fill mud and sand, not less than 2 cm, to form a good drainage path.

[0048] In a specific embodiment, the ratio of the curing agent prepared by the silt grouting pipe 32 is different from the type and content of the curing agent prepared by the sand grouting pipe 32. If the moisture content of the fill mud is not high and the fluidity is poor, the amount of water in the silt grouting liquid ratio needs to be increased. Preferably, the mass ratio of the mixture in the fill mud mixing tank 41 is fill mud:curing agent:water = 8 - 15:1:0 - 1, the mixture ratio in the fill sand mixing tank 42 is fill sand:curing agent:water = 15 - 20:1:0 - 1, and the mixture ratio for preparing the cement soil column 12 in step 7) is mud and sand:curing agent = 6 - 10:1.

[0049] By using the offshore cofferdam fill mud and sand rapid land reclamation solidification treatment system and implementation method of the present invention, the strength can be rapidly increased and the moisture content can be reduced after the solidified soil is filled, and it is a rapid land reclamation method for fill mud and sand that can be applied on a large scale at sea. Thus, the purpose of improving the foundation bearing capacity can be quickly achieved, and at the same time, problems such as insufficient strength of the fluidized solidification, excessive pores, and waste of fill sand resources can be solved.

Claims

1. A rapid land reclamation and solidification treatment system for offshore sand filling, characterized in that: The invention comprises a cofferdam (1), a screening system (2), a blown fill mud mixing chamber (41), a blown fill sand mixing chamber (42) and a drainage system; the blown fill mud mixing chamber (41) and the blown fill sand mixing chamber (42) are respectively connected to the screening system (2) through a material conveying pipe (5); the blown fill mud mixing chamber (41) is used to receive the sludge screened by the screening system (2); the blown fill sand mixing chamber (42) is used to receive the blown fill sand screened by the screening system (2); the blown fill mud mixing chamber (41) is connected to a sludge grouting pipe (31); the blown fill sand mixing chamber (42) is connected to a sand grouting pipe (32); A blown mud conveying pipe head is arranged below the mud mixing bin (41), and a blown sand conveying pipe head is arranged below the blown sand mixing bin (42), and the discharge positions of the blown mud conveying pipe head and the blown sand conveying pipe head are adjustable; the drainage system comprises a filter mesh pipe (9), a drainage pipe (6), a suction pump (7) and a main drainage pipe (8), the filter mesh pipes (9) are in plurality, and the plurality of filter mesh pipes (9) are vertically arranged in the cofferdam (1), the drainage pipe (6) is placed in the filter mesh pipe (9), the plurality of drainage pipes (6) are connected to the main drainage pipe (8), and the main drainage pipe (8) is connected to the suction pump (7).

2. The offshore sand filling rapid land reclamation and solidification processing system according to claim 1 is characterized in that: The filter mesh tube (9) has threaded joints at the upper and lower ends, which can be knotted and extended according to the filling depth.

3. The offshore sand filling rapid land reclamation and solidification treatment system according to claim 1 is characterized in that: The bottom of the filter mesh tube (9) is threadedly sleeved with a sleeve (91) to prevent soil from entering the tube after being inserted into the filling area.

4. The offshore sand filling rapid land reclamation and solidification treatment system according to claim 1 is characterized in that: The blown mud mixing bin (41) is connected and fixed to the sludge grouting pipe (31) by means of threaded bolts, and the blown sand mixing bin (42) is connected and fixed to the sand grouting pipe (32) by means of threaded bolts.

5. A method for implementing the rapid land reclamation and solidification treatment of offshore sand filling, characterized in that: The offshore sand filling rapid land reclamation and solidification system according to any one of claims 1 to 4 is adopted, comprising the following steps: 1) Determine the size of the cofferdam (1), divide the filling area, and determine the number and position of the vertical filter pipes (9); 2) One end of the filter mesh tube (9) is sealed and vertically inserted into a designated position, the drain pipe (6) is placed in the metal filter mesh tube (9), all the drain pipes (6) are connected to the main drain pipe (8), and the main drain pipe (8) is connected to the suction pump (7); 3) The blown fill mud mixing bin (41) and the blown fill sand mixing bin (42) are respectively connected to the left and right ends of the screening system (2) through the material conveying pipe (5), and the grouting pipe is connected and fixed to the corresponding mixing bin; 4) The sludge from the filling is discharged into the screening system (2), and the screened sludge is transported to the filling mud mixing bin (41) to be mixed and stirred with cement slurry to obtain fluidized solidified mud; the screened filling sand is transported to the filling sand mixing bin (42) to be mixed and stirred with cement; after stirring, the fluidized solidified mud obtained in the filling mud mixing bin (41) is transported to a predetermined filling area through a pipeline, and at the same time, the mixture obtained in the filling sand mixing bin (42) is transported to an adjacent area of ​​the fluidized solidified mud; 5) After the fluidized solidified mud is blown to a certain depth, the blowing mud conveying pipe head and the blowing sand conveying pipe head are exchanged for blowing positions to continue blowing, thereby forming a stacked solidified blowing mud layer (10) and a solidified blowing sand layer (11); 6) Repeat step 5) until the filling reaches the target elevation, thereby forming a layered solidified filling mud layer (10) and a solidified filling sand layer (11). During the process, the water in the filter mesh tube (9) is discharged out of the filling area through the suction pump (7) and the main drainage pipe (8); 7) After the landfill is solidified and the water is completely drained, the filter mesh tube (9) is pulled out and the drainage pipe (6) is removed for recycling; at the same time, cement slurry or cement soil slurry is injected into the hole formed by pulling out the filter mesh tube (9) to form a cement soil column (12) for reinforcing the foundation, and finally a cushion layer (13) is laid on the surface.

6. The method for implementing the rapid land reclamation and solidification treatment of offshore sand filling according to claim 5 is characterized in that: The specific implementation method of step 2) includes: 2.1) The filter mesh tube (9) is knotted and extended according to the filling depth, and after knotting, the bottom is covered with a sleeve (91), and the drainage pipe (6) is passed through the filter mesh tube (9); 2.2) First, fill the fluidized solidified mud to a certain thickness, and then use the work boat to insert the filter mesh tube (9) into the designated position at intervals after its strength is enhanced. 2.3) The drainage pipes (6) in each filter mesh tube (9) are interconnected and connected to the main drainage pipe (8).

7. The method for rapid land reclamation and solidification of offshore sand filling according to claim 5, characterized in that: When the blown sand layer (11) is blown and solidified in step 5), the position of the blown sand conveying pipe head is preferably placed between the filter mesh pipes (9).

8. The method for rapid land reclamation and solidification of offshore sand filling according to claim 7, characterized in that: The mass ratio of the mixture in the blown fill mud mixing bin (41) is blown fill mud: curing agent: water = 8-15:1:0-1, and the mass ratio of the mixture in the blown fill sand mixing bin (42) is blown fill sand: curing agent: water = 15-20:1:0-1.

9. The method for implementing the rapid land reclamation and solidification treatment of offshore sand filling according to claim 5, characterized in that: In the step 5), the depth of the solidified dredger fill mud layer (10) is 8-12 cm, and the depth of the solidified dredger fill sand layer (11) is not less than 2 cm.

10. The method for rapid land reclamation and solidification of offshore sand filling according to claim 5, characterized in that: The mixture ratio of preparing the cement soil column (12) in step 7) is mud sand: curing agent = 6 to 10:1.

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