Drainage consolidation method

Abstract

According to the drainage consolidation method, the construction period can be greatly shortened, the construction cost is reduced, and the construction process is simplified. The drainage device comprises a drainage structure, the drainage structure comprises a structure body, a plurality of convex tooth structures are arranged on the outer surface of the structure body in an array mode, a drainage channel groove is formed between every two adjacent convex tooth structures, and a sealing structure is arranged on the drainage channel groove located in the top of the structure body. The closed structure is matched with the drainage channel groove to form a drainage hole. The method further comprises the following specific steps that S1, a soil filling layer is leveled; s2, a construction hole is drilled, and the structure body coated with the geotechnical cloth is placed in the construction hole; s3, the top end of the structure body is connected with a vacuum jet pump; s4, vacuumizing is carried out after the sealing state is checked; step S5, taking out the structure main body; and S6, backfilling is conducted finally. The method is applied to the technical field of foundation treatment in geotechnical engineering.

Description

Technical Field

[0001] The present invention is applied to the technical field of foundation treatment in geotechnical engineering, and particularly relates to a drainage consolidation method with simple procedures, cost reduction, efficiency improvement, and shortened construction period. Background Art

[0002] Engineering construction in coastal areas, deltas and inland lakes requires vacuum preloading of the soft clay soil that is commonly found underground, so that it can be consolidated and settled in advance, thereby reducing ground settlement and uneven settlement after construction and improving the bearing capacity of the foundation. Figure 1 As shown, the traditional drainage consolidation method is to vacuum the vertical drainage channel buried in the silt soil, and then extract the water vapor to solidify the soft clay. Before vacuuming, it is necessary to set a sealing wall at the edge of the vacuuming area, wherein the sealing wall is usually made of cement mixing piles or mud mixing piles, and then the drainage channel is driven into the foundation to first lay a sand cushion layer and then lay geotextile and sealing film on the surface of the sand cushion layer in sequence. In order to ensure the curing effect, the sealing of the sealing touch needs to be checked and verified many times, and finally the drainage channel is connected to the vacuum equipment for curing. Due to the need to set up a sealing wall, a sand cushion layer and the laying of a sealing film, there are often many preliminary construction processes, high costs and long construction periods. In addition, the traditional drainage channel is usually a plastic drainage board or a bagged sand well, and the plastic drainage board or bagged sand well invested cannot be recycled, which increases the construction cost and continues to produce a consolidation effect, resulting in continuous post-construction settlement.

[0003] For example, the Chinese patent with publication number CN114922158B discloses a recyclable drainage structure and construction method, which enables the drainage structure to be recycled in the later stage of the project, thereby reducing construction costs and avoiding long-term settlement. However, in this solution, it is still necessary to lay out the sealing wall and set the sealing membrane in advance, which cannot further reduce the construction time and save costs. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a drainage consolidation method that can significantly shorten the construction period, reduce construction costs and simplify the construction process.

[0005] The technical solution adopted by the present invention is: the present invention includes a drainage structure, the drainage structure includes a structural body, the outer surface array of the structural body is provided with a plurality of convex tooth structures, a drainage channel groove is formed between two adjacent convex tooth structures, a closed structure is provided on the drainage channel groove located at the top of the structural body, the closed structure cooperates with the drainage channel groove to form a drainage hole, and the present invention also includes the following specific steps: Step S1, leveling the fill layer in the area where drainage and consolidation are required; Step S2, after the fill layer is leveled, a construction hole is punched from the fill layer by an insertion device to a depth of the silt soil that needs to be drained and consolidated, and the structural body covered with the geotextile is placed into the construction hole by the insertion device, and the closed structure of the structural body is placed in the fill layer and penetrates into the silt soil to a depth of at least 0.3m, and the lower part of the structural body is connected to the silt soil that needs to be drained and consolidated by the geotextile; Step S3, connecting the top end of the structural body to a vacuum jet pump through a pipe fitting, so that the drainage hole in the structural body is connected to the vacuum jet pump; Step S4, after checking the sealing status of each part and the sealing of the connection, start the vacuum jet pump to evacuate the air, so that the moisture and air in the silt soil pass along the structural body, and converge into the drainage hole at the upper part of the structural body and enter the pipe to be discharged, thereby achieving drainage and consolidation of the silt soil; Step S5: After the drainage and consolidation are completed, the fill layer around the top of the structural body is removed to create a gap between the geotextile and the structural body, and then the structural body is taken out by an insertion device; Step S6: Finally, dense clay soil is backfilled in the geotextile to complete the drainage consolidation of the silt soil and the recovery of the drainage structure.

[0006] It can be seen from the above scheme that by adopting a drainage member with a convex tooth structure on the outer surface, the surface area is expanded and the water diversion efficiency is improved. At the same time, the drainage channel groove formed by the convex tooth structure is used in conjunction with the closed structure to form a drainage hole on the top, wherein the top of the structural body is isolated from the fill layer by the sealing structure, so that the vacuum effect will not act on the fill layer around the structural body. The water and steam in the fill layer are isolated from the drainage hole during the vacuum process, so that the water and steam in the silt soil can pass through the fill layer without contact through the drainage hole during vacuuming, so that the isolation effect of the fill layer will not be destroyed during the vacuum stage. At the same time, with the drainage and exhaust capacity of the drainage structure, the effect of not needing to construct an isolation wall, a sand cushion layer, a geotextile on the sand cushion layer, and a sealing film is achieved, which greatly reduces the construction process, saves construction costs, and shortens the construction period. And through the cooperation of the geotextile and the structural body, the structural body can be unloaded and recycled after consolidation, and then the construction impact is reduced by backfilling, ensuring the stability and reliability of the subsequent construction.

[0007] A preferred solution is that the length of the closed structure is greater than the thickness of the fill layer, and in step S2, the top water outlet of the drainage hole is exposed from the fill layer, and the lower water inlet of the drainage hole is located in the silt soil area below the fill layer.

[0008] A preferred solution is that the length of the geotextile is greater than the length of the drainage channel groove without the closed structure, and the lower water inlet of the drainage hole is located within the covering range of the geotextile.

[0009] A preferred solution is that the drainage structure also includes a cap and a plurality of connecting bolts, and the bottom of the cap and the top of the structural body are provided with a plurality of connecting holes compatible with the connecting bolts, the cap is connected to the top of the structural body through the cooperation of the connecting bolts and the connecting holes, and the cap is provided with a lifting hole that cooperates with the insertion device.

[0010] A preferred solution is that in step S5, the backfill layer around the top of the structural body is first cleaned to expose the top of the geotextile, then the pipe is removed, the top circumference of the geotextile is fixed by a fixing structure so that the top of the geotextile is pressed against the surface of the structural body, the pressurizing device is connected to the external atmosphere or a lubricating foam storage container, and the output interface of the pressurizing device is connected to the top of the geotextile, the pressurizing device is started and air or lubricating foam is injected between the geotextile and the structural body, thereby creating a gap between the geotextile and the structural body, and the removal of the geotextile is completed; after the removal is completed, the cap is connected to the structural body by the connecting bolts, and the structural body is pulled out of the geotextile by connecting the insertion device to the cap.

[0011] A preferred solution is that after the fill layer is leveled in step S1, the fill layer is compacted by equipment; after the connection of the pipes is completed in step S3, the fill layer around the main structure is compacted again.

[0012] A preferred solution is that a guiding earth-breaking structure is provided at the bottom of the structural body, and the guiding earth-breaking structure is in a cone or triangular prism shape.

[0013] A preferred solution is that the structural body is in the shape of a cylinder or a long plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a construction diagram of the traditional consolidation method; Figure 2 It is a first construction schematic diagram of the present invention; Figure 3 This is the first construction schematic diagram of the present invention; Figure 4 is a schematic diagram of the structure after the drainage structure is placed; Figure 5 is a three-dimensional structural schematic diagram of the drainage structure; Figure 6 is a schematic diagram of the exploded structure of the drainage structure; Figure 7 is a schematic diagram of the exploded structure of the cylindrical drainage structure; Figure 8 It is a cross-sectional schematic diagram of the cylindrical structural body. DETAILED DESCRIPTION

[0015] like Figures 2 to 8As shown, in this embodiment, the present invention includes a drainage structure, which includes a structural body 1, and a plurality of convex tooth structures 2 are arranged in an array on the outer surface of the structural body 1, and a drainage channel groove 3 is formed between two adjacent convex tooth structures 2, and a closed structure 4 is arranged on the drainage channel groove 3 located at the top of the structural body 1, and the closed structure 4 cooperates with the drainage channel groove 3 to form a drainage hole 5, and the drainage structure also includes a cap 9 and a plurality of connecting bolts 10, and a plurality of connecting holes 11 compatible with the connecting bolts 10 are arranged on the bottom of the cap 9 and the top of the structural body 1, and the connecting holes 11 of the structural body 1 are located on the plurality of convex tooth structures 2, and the cap 9 is connected to the top of the structural body 1 through the cooperation of the connecting bolts 10 and the connecting holes 11, and a lifting hole 12 cooperating with the insertion device is arranged on the cap 9. The drainage channel groove 3 is formed by the cooperation of several convex tooth structures 2, thereby increasing the contact area and improving the water diversion efficiency; when the contact area increases, the range in which each drainage structure can be consolidated becomes larger, thereby reducing the total number of drainage structures required during consolidation, further reducing costs and shortening the construction period. At the same time, the connection holes 11 set on the several convex tooth structures 2 by the structural main body 1 have sufficient connection strength to ensure that the structural main body 1 can be stably and reliably removed. The cap 9 is connected with the structural main body 1 to provide a connection structure for lifting by the plug-in device. At the same time, a split structure is adopted to ensure that the drainage channel groove 3 is not blocked by the cap 9 during the consolidation and drainage process, and the lifting hole is used to connect with an external lifting device. The fill layer 6 is a naturally existing rock and soil structure. It is leveled to ensure that the equipment can pass through and is easy to construct. The traditional drainage structure usually directly passes through the fill layer for vacuum curing. During the vacuuming process, the drainage channel is in direct contact with the fill layer, so that the water vapor in the fill layer 6 in the area that needs to be cured during vacuuming is connected with the water vapor in the fill layer 6 in the outside area. In this way, it is necessary to use isolation walls and vacuum membranes to separate the area that needs to be cured from the outside area, so that the area that needs to be cured forms a vacuum state during vacuuming. The construction process is complicated and the cost is high. It often causes cracking and damage to the ground near the area that needs to be cured. Through the isolation structure of the drainage structure, the collection point is placed in the silt layer below the fill layer 6, so as to achieve the effect of isolating the fill layer 6, and no sealing treatment is required, which reduces a large number of preliminary processes. The geotextile 8 is used to isolate the structural body 1 from the silt soil, prevent the soil from sticking to the structural body 1 during vacuuming, ensure the smooth flow of the drainage channel, and at the same time, it is used as an isolation during recycling to fill the medium to produce a gap for the structural body 1 to detach, thereby achieving the effect of smooth recycling. At the same time, it avoids the continuous post-construction settlement caused by the drainage structure being left in the silt soil, simplifies the construction process, reduces project costs, and reduces the tensile and cracking damage to the ground in the nearby area.

[0016] The drainage consolidation method also includes the following specific steps: Step S1, leveling the fill layer 6 in the area where drainage and consolidation are required, and compacting the fill layer 6 to improve the isolation effect of the fill layer 6 and ensure the structural stability of the fill layer 6 during the vacuum stage; Step S2: After the fill layer 6 is leveled, a construction hole is punched from the fill layer 6 to a depth of the silt soil 7 that needs to be drained and consolidated by means of an insertion device, and the depth of the construction hole matches the length of the structural body 1; then the structural body 1 covered with the geotextile 8 is placed into the construction hole by means of the insertion device, as shown in FIG. Figure 2 As shown, the closed structure 4 of the structural body 1 is closely matched with the fill layer 6 and penetrates into the silt soil 7 to a depth of at least 0.3m, so as to achieve the effect of isolating the water and air in the drainage hole 5 and the fill layer 6, ensuring that the water vapor in the silt soil 7 is extracted through the drainage hole 5 without passing through the fill layer 6, and the lower part of the structural body 1 is connected with the silt soil 7 that needs to be drained and consolidated through the geotextile 8; Step S3, connecting the top of the structural body 1 to the vacuum jet pump through a pipe fitting, so that the drainage hole 5 in the structural body 1 is connected to the vacuum jet pump, and after completing the connection of the pipe fitting, the fill layer 6 around the structural body 1 is compacted again, thereby ensuring the reliability of the isolation effect; Step S4, after checking the sealing status of each part and the sealing of the connection, start the vacuum jet pump to evacuate the air, so that the moisture and air in the silt soil 7 pass along the structural body 1, and converge into the drainage hole 5 at the upper part of the structural body 1 and enter the pipe to be discharged, thereby achieving drainage and consolidation of the silt soil 7; Step S5, after completing drainage and consolidation, remove the fill layer 6 around the top of the structural main body 1 and expose the top of the geotextile 8, remove the pipe fittings, fix the top periphery of the geotextile 8 by a fixing structure, so that the top of the geotextile 8 is constrained on the surface of the structural main body 1, connect the pressurizing device to the external atmosphere or the lubricating foam storage container, and connect the output interface of the pressurizing device to the top of the geotextile 8, start the pressurizing device and inject air or lubricating foam between the geotextile 8 and the structural main body 1, so as to generate a gap between the geotextile 8 and the structural main body 1, realize the separation between the structural main body 1 and the silt soil, connect the structural main body 1 by the cap 9, and then connect the structural main body 1 to the cap 9 by the insertion device, so as to lift the structural main body 1 out of the silt soil; Step S6: Finally, the dense clay soil is backfilled into the geotextile 8, thereby completing the drainage consolidation of the silt soil 7 and the recovery of the drainage structure.

[0017] In this embodiment, the edge of the construction area can be assisted in solidification by stacking.

[0018] like Figure 3 and Figure 4 As shown, in this embodiment, the pipe fittings include a transfer pipe 14 and a horizontal pipe 15. Several drainage structures are distributed in an array in the construction area. Two adjacent rows of drainage structures share one horizontal pipe 15 and are connected to the horizontal pipe 15 through the transfer pipe 14. The top of the structural body 1 is connected to the transfer pipe 14, and the drainage hole 5 is connected to the transfer pipe 14. All the horizontal pipes 15 are connected and connected to the vacuum jet pump. The number of drainage structures, array distribution, and the number of vacuum jet pumps used during construction are adjusted according to the actual area required for construction. As the construction area increases, the number of drainage structures and vacuum jet pumps can be increased to ensure the consolidation effect and consolidation time.

[0019] In step S3, it is preferred that the closed structure 4 penetrates into the silt soil 7 to a depth of about 0.5 m for better effect, so that the water vapor of the silt soil 7 close to the fill layer 6 is gathered to the position of the entrance of the drainage hole 5 below, which can better ensure the structural stability of the fill layer 6.

[0020] In this embodiment, the length of the closed structure 4 is greater than the thickness of the fill layer 6, thereby ensuring that the closed structure 4 isolates the fill layer 6 outside the drainage hole 5, ensuring that the vacuum effect does not act on the fill layer 6, ensuring the isolation effect and the structural stability of the fill layer 6; in step S2, the top water outlet of the drainage hole 5 is exposed from the fill layer 6 to facilitate the connection of pipe fittings; the lower water inlet of the drainage hole 5 is located in the silt 7 area below the fill layer 6 and is covered by the geotextile 8, thereby ensuring that the lower water inlet will not be invaded by the silt 7 during the vacuum stage and cause blockage. In the placement stage of step S2, the top of the geotextile 8 is fixed in advance by a fixing structure, thereby ensuring that the geotextile 8 can effectively isolate the silt 7.

[0021] In this embodiment, the length of the geotextile 8 is greater than the length of the drainage channel groove 3 without the closed structure 4, and the lower water inlet of the drainage hole 5 is located within the covering range of the geotextile 8, thereby ensuring that the geotextile 8 covers the entire water diversion area of ​​the structural body 1, isolating the silt soil 7, facilitating the subsequent removal of the geotextile 8, and stabilizing the water diversion efficiency.

[0022] like Figures 4 to 8As shown, in this embodiment, a guiding earth-breaking structure 13 is provided at the bottom of the structural body 1. The guiding earth-breaking structure 13 is in the shape of a cone or a triangular prism. The guiding earth-breaking structure 13 is provided to facilitate guidance during the placement process, so as to avoid being blocked by the soil during placement, thereby ensuring that the structural body 1 will not be damaged or bent during placement. The structural body 1 is in the shape of a cylinder or a long plate. The structural strength and surface area of ​​the structural body 1 are different in different shapes. The shape is selected according to actual needs to ensure that the placement process and water diversion efficiency meet the needs. The length of the structural body 1 is adaptively adjusted according to the soft foundation treatment depth of the silt soil.

[0023] Although the embodiments of the present invention are described with practical solutions, they do not constitute limitations on the meaning of the present invention. For those skilled in the art, it is obvious to modify the implementation scheme and combine it with other solutions based on this description.

Claims

1. A drainage consolidation method, comprising a drainage structure, wherein the drainage structure comprises a structural body (1), wherein the outer surface of the structural body (1) is provided with a plurality of convex tooth structures (2) in an array, and a drainage channel groove (3) is formed between two adjacent convex tooth structures (2), characterized in that: A closed structure (4) is provided on the drainage channel groove (3) located at the top of the structural body (1); the closed structure (4) cooperates with the drainage channel groove (3) to form a drainage hole (5); and the drainage consolidation method further comprises the following specific steps: Step S1, leveling the fill layer (6) in the area where drainage and consolidation are required; Step S2, after the fill layer (6) is leveled, a construction hole is drilled from the fill layer (6) by means of an insertion device to a depth that reaches the silt soil (7) that needs to be drained and consolidated, and the structural main body (1) covered with a geotextile (8) is inserted into the construction hole by means of the insertion device, and the closed structure (4) of the structural main body (1) is inserted into the fill layer (6) and penetrates into the silt soil (7) to a depth of at least 0.3 m, and the lower part of the structural main body (1) is connected to the silt soil (7) that needs to be drained and consolidated via the geotextile (8); Step S3, connecting the top end of the structural body (1) to a vacuum jet pump via a pipe fitting, so that the drainage hole (5) in the structural body (1) is connected to the vacuum jet pump; Step S4, after checking the sealing status of each location and the sealing of the connection, start the vacuum jet pump to evacuate the air, so that the moisture and air in the silt soil (7) pass along the structural body (1), and flow into the drainage hole (5) at the upper part of the structural body (1) and enter the pipe to be discharged, thereby achieving drainage and consolidation of the silt soil (7); Step S5: after the drainage and consolidation are completed, the fill layer (6) around the top of the structural main body (1) is removed, a gap is created between the geotextile (8) and the structural main body (1), and then the structural main body (1) is taken out by means of an insertion device; Step S6: Finally, dense clay soil is backfilled in the geotextile (8), thereby completing the drainage and consolidation of the silt soil (7) and the recovery of the drainage structure.

2. A drainage consolidation method according to claim 1, characterized in that: The length of the closed structure (4) is greater than the thickness of the fill layer (6); in step S2, the top water outlet of the drainage hole (5) is exposed from the fill layer (6), and the lower water inlet of the drainage hole (5) is located in the silt soil (7) area below the fill layer (6).

3. A drainage consolidation method according to claim 2, characterized in that: The length of the geotextile (8) is greater than the length of the drainage channel groove (3) without the closed structure (4), and the lower water inlet of the drainage hole (5) is located within the coverage of the geotextile (8).

4. A drainage consolidation method according to claim 1, characterized in that: The drainage structure further comprises a sleeve cap (9) and a plurality of connecting bolts (10); the bottom of the sleeve cap (9) and the top of the structural body (1) are both provided with a plurality of connecting holes (11) matched with the connecting bolts (10); the sleeve cap (9) is connected to the top of the structural body (1) through the cooperation of the connecting bolts (10) and the connecting holes (11); and the sleeve cap (9) is provided with a lifting hole (12) matched with an insertion device.

5. A drainage consolidation method according to claim 4, characterized in that: In step S5, the backfill layer (6) around the top of the structural body (1) is first cleaned to expose the top of the geotextile (8), then the pipe is removed, the top circumference of the geotextile (8) is fixed by a fixing structure, so that the top of the geotextile (8) is pressed against the surface of the structural body (1), the pressurizing device is connected to the external atmosphere or the lubricating foam storage container, and the output interface of the pressurizing device is connected to the top of the geotextile (8), the pressurizing device is started and air or lubricating foam is injected between the geotextile (8) and the structural body (1), thereby creating a gap between the geotextile (8) and the structural body (1), and the removal of the geotextile (8) is completed; after the removal is completed, the cap (9) is connected to the structural body (1) by the connecting bolts (10), and the structural body (1) is pulled out of the geotextile (8) by connecting the insertion device to the cap (9).

6. A drainage consolidation method according to claim 1, characterized in that: After the fill layer (6) is leveled in step S1, the fill layer (6) is compacted by equipment; after the connection of the pipe fittings is completed in step S3, the fill layer (6) around the structural body (1) is compacted again.

7. A drainage consolidation method according to claim 1, characterized in that: A guiding earth-breaking structure (13) is provided at the bottom of the structural body (1), and the guiding earth-breaking structure (13) is in the shape of a cone or a triangular prism.

8. A drainage consolidation method according to claim 1, characterized in that: The structural body (1) is cylindrical or long plate-shaped.

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