Pre-embedded vertical drainage device for mud containing area
By pre-embedding vertical drainage devices in the sludge collection area, including the design of tapered steel pipes and filter holes, the problem of non-reusability in conventional processes is solved, achieving rapid drainage and cost savings, and improving the utilization efficiency and environmental friendliness of the sludge collection area.
Patent Information
- Application Number
- CN202520346562.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-03
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-03-03
AI Technical Summary
Conventional drainage consolidation processes can only drain dredged soil once and cannot be reused, resulting in long dredging and reclamation periods, high costs, and low utilization rates of the sedimentation area.
Before filling the mud-bearing area, a vertical drainage device is pre-embedded, including evenly distributed conical steel pipes and filter holes, with non-woven geotextile connected to the inner wall, to quickly drain the moisture from the lower dredged soil, reduce the moisture content, and reuse the drainage device.
Shortening the drying time of dredged soil saves project costs, improves the utilization rate of the dredging area, conforms to the concept of green construction, and solves the problems of excessive moisture content of the lower layer of dredged soil and difficulties in transportation and transshipment.
Smart Images
Figure CN223907473U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to land mud receiving area pretreatment construction technology field, especially in kind of mud receiving area pre -buried vertical drainage device. BACKGROUND
[0002] In recent years, due to the shortage of land resources, dredging and filling engineering is increasing. Often, after dredging soil is filled to the land side mud receiving area, it needs to be dried to meet the design requirements, and then transported to other areas on land for use. And due to the limited range of mud receiving area site, there are situations of multiple filling and transporting of dredged soil in mud receiving area.
[0003] Because the conventional drainage consolidation process is to set up drainage devices after filling, and the conventional drainage consolidation process can only meet the drainage and consolidation of dredged soil once, it cannot be reused, so drainage devices need to be set up again after each mud receiving area filling. The conventional process not only greatly affects the dredging and filling period, but also has high cost and low utilization rate of mud receiving area. UTILITY MODEL CONTENT
[0004] To solve the above problems, the utility model provides a mud receiving area pre -buried vertical drainage device and construction method, which shortens the drying time of dredged soil, saves engineering cost, saves energy and protects the environment, and effectively solves the problems of high water content of lower dredged soil and difficult transportation.
[0005] To achieve the above purpose, the utility model adopts the technical scheme: a mud receiving area pre -buried vertical drainage device, characterized by, including a plurality of steel pipes with tapered bottom uniformly distributed, the steel pipe sequentially includes undisturbed soil part, dredged soil part and exposed part from bottom to top, a plurality of water filter holes are uniformly arranged around the dredged soil layer part, and the inner wall is connected with a layer of non -woven geotextile.
[0006] The diameter of the water filter hole is 0.5cm, arranged in the shape of plum blossom, and the arrangement spacing is 5cm.
[0007] The steel pipe adopts Q345 round steel pipe, the diameter is 50cm, the steel pipe wall thickness is 1cm, the length is 6.2m, and the steel pipe is filled with medium -coarse sand with less than 5% of silt content.
[0008] The specification of the geotextile is 400g / m2.
[0009] The undisturbed soil part is 1 / 3 of the total length of the steel pipe, and the exposed part is 0.2m.
[0010] The utility model discloses a vertical drainage device is buried in the silt area, and the water in the lower dredged soil is effectively discharged, the water content of the dredged soil is reduced, the physical state of the dredged soil is changed from flow plastic to semi-solid, and the drainage device can be repeatedly used, the drainage channel does not need to be set up for many times, the engineering cost is saved, energy is saved and environmental protection is achieved, the problem of too high water content of the lower dredged soil and difficult transportation is solved effectively while guaranteeing the drainage and consolidation quality of the dredged soil and shortening the airing time of the dredged soil. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 It is the section view of cofferdam for the utility model;
[0012] Figure 2 It is the schematic diagram of steel pipe structure for the utility model;
[0013] Figure 3 It is the pre-buried plane position drawing of vertical drainage device;
[0014] In the drawing: steel pipe 1, original soil part 11, dredged soil part 12, exposed part 13, filter hole 2, non-woven geotextile 3, clay cofferdam 4, original soil 5, dredged soil 6, arrangement interval D. DETAILED DESCRIPTION
[0015] The utility model is further illustrated below in connection with the drawings, but the utility model is not limited to specific embodiments.
[0016] Embodiment 1
[0017] As Figure 2 A vertical drainage device is buried in the silt area, including the steel pipe 1 of the bottom of multiple even distribution cone type, the steel pipe 1 includes original soil part 11, dredged soil part 12 and exposed part 13 from bottom to top in turn, the dredged soil part 12 is evenly provided with several filter holes 2 around, and the inner wall is connected with a layer of non-woven geotextile 3, and the geotextile specification is 400g / m2.
[0018] The original soil part 11 is 1 / 3 of the total length of the steel pipe, and the exposed part 13 is 0.2m.
[0019] The filter hole 2 is 0.5cm in diameter, is arranged in the shape of plum blossom, and the arrangement interval D is 5cm.
[0020] The steel pipe 1 adopts Q345 round steel pipe, and the diameter is 50cm, the steel pipe wall thickness is 1cm, the length is 6.2m, and the steel pipe 1 is filled with medium-coarse sand with a clay content less than 5% inside.
[0021] Embodiment 2
[0022] Engineering background: The water depth in front of a certain wharf does not meet the design requirements, and dredging operations need to be carried out in the harbor basin, but there is no suitable mud dumping site in the surrounding sea area, and the design requires the construction of a land-based mud storage area for hydraulic filling and the land-based transportation of dredged soil to the designated area. Due to the limited area of the rear site, the amount of dredging is much larger than the capacity of the mud storage area, with about 2 million m³ of dredging and only 10 m³ of single capacity of the mud storage area. The mud storage area needs to be repeatedly filled and the dredged soil needs to be transported.
[0023] First step: filling the cofferdam to form the mud storage area
[0024] For example Figure 1 A cofferdam is filled around the area to be filled, with an original ground elevation of -3 m, a filling elevation of +7 m, and a filling area of 50,000 m². The top elevation of the cofferdam is set at +7.5 m, which is 0.5 m higher than the filling elevation. The cofferdam is filled with impermeable clay for construction, with a cofferdam top width of 2 m, a slope of 1:2 near the mud storage area side, and a slope of 1:2.5 on the other side, to ensure the stability of the cofferdam during filling and drying. At the same time, a layer of non-woven geotextile is laid on the side of the cofferdam near the mud storage area to prevent the filling soil from seeping out of the cofferdam. A sedimentation tank and a drainage outlet are also set up on the sea side to ensure environmental protection requirements while draining water from the dredged soil into the sea.
[0025] Second step: making vertical drainage devices
[0026] After the cofferdam of the mud storage area is filled, the vertical drainage devices are made according to the structure described in Example 1, with 2 m into the original ground and the remaining 4.0 m in the dredged layer. The filling soil level is controlled during dredging and filling to ensure that the top elevation of the vertical drainage device is 0.2 m higher than the top elevation of the filling, and the bottom is tapered to facilitate the vertical drainage device to be driven in. A layer of non-woven geotextile is arranged on the inner wall of the vertical drainage device in the dredged layer to prevent the dredged soil from entering the steel pipe and blocking the drainage channel, ensuring that the dredged soil can smoothly drain water.
[0027] Third step: burying vertical drainage devices before dredging and filling
[0028] For example Figure 3 Before dredging and filling, the vertical drainage devices are pre-buried, and a hydraulic pile driver is used to arrange the vertical drainage devices in a square pattern with a spacing of 10 x 10 m. During the driving process, the elevation control is the main consideration to ensure the stability of the vertical drainage device after driving. After the vertical drainage device is driven in, the inside of the steel pipe is filled with medium-coarse sand with a clay content of less than 5%.
[0029] Fourth step: carrying out filling operations
[0030] After the vertical drainage device is completed, the blowing and filling operation of the mud receiving area is started, the dredged soil on the sea is blown and filled to the mud receiving area through the mud discharge pipeline by the cutter suction dredger, but the overall blowing and filling elevation of the mud receiving area is controlled during the blowing and filling process, so that a slope not less than 0.5% is formed from the mud blowing port to the drainage port, and the water flow of the dredged soil is discharged to the drainage port during the drying process. Meanwhile, the position of the mud blowing port is ensured to be far away from the drainage port during the blowing and filling process.
[0031] Step 5: After the blowing and filling is completed, the water content monitoring device is buried in the mud receiving area
[0032] After the blowing and filling of the mud receiving area is completed, four automatic water content monitoring devices are arranged. First, the water content monitoring sensor is buried in the dredged soil, in order to ensure that the water content of the bottom layer of mud meets the requirements, the sensor is buried to a depth of 3m, and is connected to the upper data receiving device through a connecting line. The data receiving device can automatically display the water content of the dredged soil in real time. The water content of the dredged soil in this project is required to be less than 20% before the dredged soil can be transported for construction.
[0033] Step 6: After the dredged soil meets the design requirements, excavation and transportation are carried out
[0034] Through the display results of the water content monitoring device, when the values of the four water content monitoring devices arranged are all less than 20%, it is considered that the water content of the dredged soil in the mud receiving area meets the design requirements, and the transportation construction can be carried out. The excavator is used to excavate the dredged soil, which is then loaded into the self-unloading truck and transported to the designated area. During the excavation process, the pre-buried vertical drainage device needs to be protected, and within a range of 1m around the vertical drainage device, workers are used to cooperate with the excavation to avoid damaging the vertical drainage device during the excavation process and affecting the drainage effect of the dredged soil in the next cycle.
[0035] Step 7: Reuse the drainage device for the next blowing and filling construction of dredging
[0036] After the dredged soil is transported, the blowing and filling operation of the mud receiving area can be continued, and the fourth step to the sixth step is repeated for construction, and a total of four times of blowing and filling and transportation of the dredged soil in the mud receiving area are completed.
[0037] Step 8: Summary of application effect
[0038] After the construction is completed, the process of the utility model and the conventional process are compared and analyzed from the aspects of cost, construction period and environmental protection.
[0039] (1) Cost comparison and analysis
[0040] Table 1: Cost of one-time blowing and filling and transportation of dredged soil in the conventional process of the mud receiving area
[0041]
[0042] The single dredging earthwork is 400,000 m3, and the 2-4 processes need to be repeated 5 times.
[0043] The total cost is =cofferdam filling x 1+ shallow foundation treatment x 5+ drainage system setting x 5+ dredging soil transportation x 5=80+48x5+88x5+50x5=1010 million yuan.
[0044] Table 2 Dredging soil transportation cost of one-time dredging of silt area by using the utility model
[0045]
[0046] The single dredging earthwork is 400,000 m3, and the 2-4 processes need to be repeated 5 times.
[0047] The total cost is =cofferdam filling x 1+ dredging soil transportation x 5=80+50x5=650 million yuan.
[0048] (2) Period comparison and analysis
[0049] Table 3 Dredging soil transportation period of one-time dredging of silt area by using conventional process
[0050]
[0051] The single dredging earthwork is 400,000 m3, and the 2-5 processes need to be repeated 5 times.
[0052] The total period is =cofferdam filling x 1+ shallow foundation treatment x 5+ drainage system setting x 5+ dredging soil consolidation x 5+ dredging soil transportation x 5=2+3x5+1x5+5x5+1x5=52 months.
[0053] Table 4 Dredging soil transportation period of one-time dredging of silt area by using the utility model
[0054]
[0055] The single dredging earthwork is 400,000 m3, and the 2-4 processes need to be repeated 5 times.
[0056] The total period is =cofferdam filling x 1+ dredging soil consolidation x 5+ dredging soil transportation x 5=2+2+5x5+1x5=30 months.
[0057] (3) Environmental protection comparison and analysis
[0058] Conventional process: multiple drainage device construction, causing resource waste, not in line with the green construction concept.
[0059] The utility model discloses a process: the reusable drainage device can avoid resource waste and meet the national green construction development concept.
[0060] Conclusion: through comparative analysis, the utility model has greater progress than the conventional process in cost, construction period and environmental protection, saves the project cost while shortening the airing time of dredged soil, is energy-saving and environment-friendly, and effectively solves the problems of too high water content of lower dredged soil and difficult transportation.
Claims
1. A vertical drainage device embedded in a subarea, characterized in that, Including a plurality of bottom tapered steel pipe uniformly distributed, the steel pipe from bottom to top includes the original soil part, the dredged soil part and the exposed part in turn, the dredged soil layer part is uniformly provided with several water filtering holes around, and the inner wall is connected with a layer of non-woven geotextile.
2. The vertical drainage device according to claim 1, wherein The water filtering hole diameter is 0.5 cm, arranged in a plum blossom shape, and the arrangement spacing is 5 cm.
3. The vertical drainage device according to claim 1, wherein the vertical drainage device is characterized by, The steel pipe adopts Q345 round steel pipe, the diameter is 50 cm, the steel pipe wall thickness is 1 cm, the length is 6.2 m, and the steel pipe is filled with medium-coarse sand with a mud content less than 5%.
4. The vertical drainage device according to claim 1, wherein the vertical drainage device is embedded in a drainage area. The geotextile specification is 400 g / m2.
5. The vertical drainage device according to any one of claims 1 to 4, wherein the vertical drainage device is embedded in a drainage area. The original soil part is 1 / 3 of the total length of the steel pipe, and the exposed part is 0.2 m.