CN114809231B - Method for treating dredging sludge by reverse filtering surrounding well - Google Patents
Method for treating dredging sludge by reverse filtering surrounding well Download PDFInfo
- Publication number
- CN114809231B CN114809231B CN202111575680.6A CN202111575680A CN114809231B CN 114809231 B CN114809231 B CN 114809231B CN 202111575680 A CN202111575680 A CN 202111575680A CN 114809231 B CN114809231 B CN 114809231B
- Authority
- CN
- China
- Prior art keywords
- reverse
- layer
- sludge
- filtering
- reverse filtering
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001914 filtration Methods 0.000 title claims abstract description 108
- 239000010802 sludge Substances 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000000463 material Substances 0.000 claims abstract description 37
- 238000004140 cleaning Methods 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 3
- 239000010410 layer Substances 0.000 claims description 62
- 239000004576 sand Substances 0.000 claims description 51
- 239000004575 stone Substances 0.000 claims description 51
- 238000011049 filling Methods 0.000 claims description 32
- 239000004746 geotextile Substances 0.000 claims description 31
- 239000004744 fabric Substances 0.000 claims description 22
- 239000004566 building material Substances 0.000 claims description 8
- 239000011241 protective layer Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 abstract 1
- 230000002265 prevention Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 20
- 239000002689 soil Substances 0.000 description 9
- 239000000945 filler Substances 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 238000007528 sand casting Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000011041 water permeability test Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/04—Pipes or fittings specially adapted to sewers
- E03F3/046—Open sewage channels
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/002—Ground foundation measures for protecting the soil or subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/004—Sealing liners
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/14—Devices for separating liquid or solid substances from sewage, e.g. sand or sludge traps, rakes or grates
Abstract
The invention relates to a method for treating dredging sludge by utilizing a reverse filtering surrounding well, belonging to the technical field of hydraulic engineering, wherein the IPC classification number is E02B 3/02 (cleaning of river bed). The method of the invention is as follows: the tire-shaped geotechnical pipe bags are filled with filter materials and then built into the reverse filter surrounding well, sludge generated by dredging is accumulated in the reverse filter surrounding well, and water in the sludge is discharged after being filtered by the reverse filter surrounding well, so that the sludge is made into a usable engineering material. The circumferential pressure generated by the extrusion of the silt to the tyre-shaped geotechnical pipe bags ensures that the reverse filtering surrounding well has strong stability. The method of the invention is used for treating dredging sludge after the reverse filtering surrounding well for flood prevention and emergency treatment is transformed, and has the advantages of small occupied area, low manufacturing cost and obvious social and economic benefits.
Description
Technical Field
The invention relates to a method for cleaning a riverbed, in particular to a method for treating riverbed dredging sludge by using a reverse filtering surrounding well, which belongs to the field of hydraulic engineering and has the IPC classification number of E02B 3/02.
Background
The reverse filtering surrounding well (or water raising basin) is used for emergency protection of piping (sand casting and water blowing) in flood control emergency, and is commonly used for preventing the piping from taking away soil and sand in the stratum below by adopting a gunny bag filled with soil or sand to build and surround the piping at a water outlet where the piping occurs.
For many years, silt deposited in a yellow river channel is pumped by a mud suction boat and a mud pump through a back-silting and dyke-fixing project, and is conveyed to a large yellow river dyke-back river for deposition within a range of 50-100m through pipeline relay, so that pit and pool depressions caused by soil taking when the large dyke is heightened are filled, and the large dyke is reinforced while dredging the yellow river channel. The sediment dredged out of the yellow river channel almost does not contain the silt, and is conveyed into a cofferdam constructed by soil for the large-dike back river, the sediment is deposited quickly, and the water is pumped away by a water pump.
However, dredging works of local river channels, lakes, reservoirs, ponds and artificial wetlands, which are different from the dredged silt of yellow river, are a big problem in storage and later use. The following problems are mainly present:
firstly, a large amount of dredging sludge is generated during dredging, and compared with the sediment generated during dredging of yellow river, the dredging sludge has very strong fluidity, large storage occupied area and pollution to storage places.
Secondly, the water content of the sludge is large (reaching more than 90 percent), the sludge and the water are difficult to separate, the existing sludge and the water separation technology is complex, the cost is high, and the effect is poor. At present, dredging sludge is generally directly piled up on natural sites, occupies a large amount of land, is slow in drainage, is easy to pollute the environment, and occupies land for a long time.
And the mechanical strength of the treated sludge is low, the sludge cannot be directly utilized and can only be stored for a long time, so that the waste of land and resources is caused. On the other hand, the demands of China on soil materials are always larger, such as road repair and artificial landscapes in parks, and a large amount of soil materials are required.
In recent years, technology for treating sludge by using geotechnical pipe bags is rapidly developed, such as patent applications CN201910043493.X and CN202010684057.3, "ecological environmental protectionThe construction technology of the geotechnical pipe bag for disposing the dredging bottom mud of the river (equal checking, building construction, 11 year 2020) adopts a straight cylinder type geotechnical pipe bag, and the mud is filled into the geotechnical pipe bag to drain the water in the mud in the geotechnical pipe bag. The method needs to fill all cleaned sludge into the geotechnical pipe bags, so when the volume of the dredged sludge is large, the quantity of the geotechnical pipe bags to be filled is large, the filling time is long, and the capacity is 1000m 3 The fill cycle of the geotextile bag is about 5 days, so the volume of sludge treated by the method is limited. When the dredged silt amount is large, if the method of filling the silt in the geotechnical pipe bags is adopted, the method is only suitable for coastal and beach areas with large empty spaces.
In addition, the sludge dredged from the river, the lake and the pond inevitably contains sharp objects such as broken stone, broken glass, metal objects and the like, and the sharp objects are directly filled in the geotechnical pipe bags, so that the geotechnical pipe bags are punctured and cut, once a certain point is broken, the whole pipe bags can be quickly broken, sewage is difficult to clean due to cross flow, and the environmental pollution is large.
The prior patent application CN201810404543.8 is a silt bagged earth retaining wall structure and a construction method, adopts straight cylinder type geotechnical pipe bags, stacks the straight cylinder type geotechnical pipe bags into a soil retaining structure, and then stores silt in a square area behind the soil retaining structure. The structure depends on the friction force between the layers of the geotechnical pipe bags to maintain self stability. Because the friction force between the layers of the geotechnical pipe bags is small, the stacking width of the geotechnical pipe bags needs to be increased to keep the stability of the structure of the geotechnical pipe bags, and the number of the geotechnical pipe bags stacked is large, the size is large and the engineering cost is high. In addition, because the structure is formed by stacking a plurality of straight cylinder type geotechnical pipe bags, once any part of the pipe bags is broken, the whole structure can be quickly collapsed, and the stored sludge can overflow, so that safety accidents and environmental pollution are caused.
Disclosure of Invention
Aiming at the defects of the existing method, the invention provides a treatment method for dredging sludge, which has the advantages of low cost, simple construction, environmental protection and strong stability, and the technical proposal of the invention is as follows:
a method of treating dredging sludge with a reverse-filtering surrounding well, comprising the steps of:
(1) Cleaning a field: selecting a site for treating sludge, and cleaning and leveling the site;
(2) And (5) excavating a reverse filtering drainage ditch: surrounding the periphery of a field, excavating a reverse filtering drainage ditch, wherein the section of the reverse filtering drainage ditch is trapezoid, the bottom width is 40cm-80cm, the top width is 60-120cm, and the depth is 60-100 cm;
the reverse filtering drainage ditch is drained to an original river channel, a ditch pond or an artificial wetland through one or more water ditches, and is drained to a separately arranged purifying pond if the reverse filtering drainage ditch is far away from the original river channel, the ditch pond or the artificial wetland;
(3) Paving a bottom protective layer: the bottom protective layer 3 comprises a bottom geotextile, a middle geotextile film and an upper geotextile, and covers all areas within the outer edge of the reverse drainage ditch;
(4) And filling filtering materials into three layers in the reverse filtering drainage ditch: the thickness of the lower layer filtering material is 20-35cm, and the ratio of small stones to coarse sand=1:2 (volume ratio); the thickness of the middle layer filtering material is 20-35cm, the thickness of the small stone and coarse sand=1:1 (volume ratio), the thickness of the upper layer filtering material is 20-30cm, the thickness of the small stone and large stone and coarse sand=1:1:1 (volume ratio); the grain size of the coarse sand is larger than 0.5mm, the grain size of the small stone is 5-20mm, and the grain size of the big stone is 30-60mm;
(5) Paving a bottom hole reverse filtering structure: the bottom hole reverse filtering structure comprises a bottom hole reverse filtering layer and a bottom hole geotextile; firstly, paving the bottom hole reverse filtering layer in an area surrounded by the inner edge of the reverse filtering drainage ditch; the bottom hole reverse filtering layer is divided into three layers, namely a coarse sand layer, a small stone layer and a large stone layer from bottom to top, wherein the thickness of each layer is 10-15cm, the grain size of coarse sand is larger than 0.5mm, the grain size of small stone is 5-20mm, and the grain size of large stone is 30-60mm; layering and flattening, and then paving a bottom geotextile on the upper part of the bottom reverse filtering layer, wherein the effective aperture of the bottom geotextile is more than or equal to 0.35mm;
(6) Setting a reverse filtering surrounding well body: placing a first layer of tyre-shaped geotechnical pipe bag on the bottom geotechnical cloth, wherein the bag body of the tyre-shaped geotechnical pipe bag is made of a whole geotechnical cloth, and the whole bag body is provided with a transverse interface and a longitudinal interface, and the longitudinal interface is positioned in the middle of the inner ring; the upper part of the bag body is provided with a plurality of filling openings; the effective aperture of geotextile for manufacturing the tyre-shaped geotextile tube bag is larger than 0.40mm;
pouring small stones and coarse sand with the volume ratio of 1:1 into a stirring pool, adding water, stirring uniformly, and filling the mixture into the bag body through a filling port on the bag body by using a sand pump, wherein the volume of the filled filling material is 70-80% of the volume of the bag body of the tire-shaped geotechnical pipe bag; the grain diameter of the coarse sand is larger than 0.5mm, and the grain diameter of the small stone is 5-20mm;
(7) Placing a second layer of tire-shaped geotechnical pipe bags on the first layer of tire-shaped geotechnical pipe bags, and filling with filling materials;
(8) Repeating the steps (6) - (7) until the height of the reverse filtration surrounding well body meets the design requirement;
(9) Repeating the steps (6) - (8), and arranging a plurality of reverse filtration surrounding well bodies in the area surrounded by the reverse filtration drainage ditch;
(10) Pumping the sludge: pumping water bottom sludge of a river channel, a ditch pond or an artificial wetland, and sequentially inputting the water bottom sludge into a plurality of reverse filtering surrounding wells;
(11) Mixing the sand and the silt into building materials: when the water content of the sludge in the reverse filtering surrounding well body meets the requirement, mixing the sludge with the reverse filtering surrounding well body and the sand and stone material of the bottom hole reverse filtering structure together to be used as a building material for secondary use.
Further, the transverse joint has a lap width greater than 20cm and the longitudinal joint has a lap width greater than 10cm.
The invention has the following technical effects:
(1) Well body stabilization: the method of the invention structurally reforms the traditional reverse filtering surrounding well, adopts the annular closed tire-shaped geotechnical pipe bag to replace the traditional sand bag (the stability of the traditional surrounding well depends on the friction effect among layers of the pipe bag), and utilizes the tension generated when the tire-shaped geotechnical pipe bag is extruded by the mud in the annular area to deform, so as to restrain the mud in the ring, thus the ring is more stable than the traditional surrounding well body, and the ring is not deformed and collapsed.
(2) The geotechnical pipe bag has reasonable structure: the bag body of the tyre-shaped geotechnical pipe bag is made of a whole geotechnical cloth, and the whole bag body is only provided with a transverse interface and a longitudinal interface, and the longitudinal interface is positioned in the middle of the inner ring and has a reasonable stress structure.
(3) The sludge dewatering speed is high: the structures of the well body and the bottom of the well body of the surrounding well are set to be rapid permeable structures, so that sludge in the surrounding well can be rapidly dehydrated from the bottom simultaneously, the efficiency is high, and the water content of the treated sludge is low. The method comprises the following steps:
the filling material in the well tyre-shaped geotechnical pipe bag is not only a main material for forming the well body, but also a filtering material for dehydrating the side surface of the well body, and the rapid water permeation and long-time water permeation of the surrounding well body are realized by combining the bag body material with high aperture rate; the high-aperture-rate bottom hole geotextile is combined with the bottom hole reverse filter layer, so that the bottom hole rapid water permeation and long-time water permeation are realized.
(4) The reverse filtering drainage ditch is arranged around the reverse filtering surrounding well, and sand and stone are paved in the ditch, so that a solid field can be provided for early construction, and a stable foundation can be provided for a well body; more importantly, the well filtrate is collected and then further filtered. The tire-shaped geotechnical pipe bag body and the bottom hole geotechnical cloth can be made of geotechnical cloth with large effective aperture only by the reverse filtering action in the reverse filtering drainage ditch, the dewatering speed is high, the water permeability can be kept for a long time, the dewatering efficiency of sludge in a surrounding well is high, the water content of the treated sludge is low, and the sludge can be put into secondary use in a short time.
(5) After the sludge is dehydrated, the tyre-shaped geotechnical bags, the filling materials of the geotechnical bags, the bottom reverse filtering layer and the sand and stones of the reverse filtering drainage ditch are mixed with the dehydrated sludge, so that the dehydrated sludge can be immediately used as a building material for the second time, and the sludge dehydration site can be quickly restored to the original appearance.
(6) Compared with the existing dredging sludge treatment technology, the construction cost is low (geotechnical cloth bags and sand and stone materials are low in price, and building rubbish can be adopted to replace sand and stone materials), the construction speed is high (the construction method can be used for leveling a field, paving the sand and stone materials and filling the geotechnical cloth bags), the occupied area is small, pollution is avoided (social conflict is greatly reduced), the safety is high (the tyre-shaped geotechnical cloth bags cannot be broken, the well body is stable and does not collapse), the dehydration speed is high, and the dehydrated sludge can be completely reused. Is particularly suitable for popularization and application in the dredging of park lakes, artificial wetlands, rivers and lakes which lack construction sites, are close to residential living areas and have short construction period requirements.
Drawings
FIG. 1 is a schematic side view of a reverse-filtering containment well of the present invention;
FIG. 2 is a top view of the reverse osmosis containment well of the present invention;
FIG. 3 is a top view of a tire-shaped geotube bag used in the present invention;
FIG. 4 is a section A-A of the tire-shaped geotube bag of FIG. 3.
In the figure, 1, reversely filtering a surrounding well body; 2. a bottom hole reverse filtering structure; 3. a bottom protective layer; 4. reverse filtering drainage ditch; 5. tyre-shaped geotechnical pipe bags; 6. geotextile at the bottom of well; 7. a bottom hole reverse filtering layer; 8. a lateral interface; 9. a longitudinal interface; 10. a filling port; 11. and (5) filling materials.
Detailed Description
Embodiments of the present invention will now be described in detail with reference to FIGS. 1-4, taking the dredging process of the Website lake as an example.
The invention relates to a method for treating dredging sludge by utilizing a reverse filtering surrounding well, which comprises the following steps:
(1) Cleaning a field: selecting a site for treating the sludge, and cleaning and leveling the site.
The project takes the occupation area to be widened on the south side of the nearby highway as a sludge treatment field, and mixes the treated sludge with sand for reverse filtration for use on site, thereby saving a large amount of later transportation cost and saving a large amount of occupation cost as roadbed filling during widening.
(2) Excavation of a reverse filtering drainage ditch 4: and excavating a reverse filtering drainage ditch 4 around the periphery of the field, wherein the section of the reverse filtering drainage ditch 4 is trapezoid, the bottom width is 40cm-80cm, the top width is 60-120cm, and the depth is 60cm-100cm. The reverse drainage ditches 4 shown in fig. 1 and 2 are circular, but are not limited to circular, and the number of the reverse drainage ditches 1 arranged in the same construction site is determined according to the shape and the area of the construction site, so that the whole construction site must be surrounded by the reverse drainage ditches 4, and all the reverse drainage ditches 1 in the construction site are surrounded by the reverse drainage ditches 4.
The construction site occupied by the project is 280m in east-west and 16m in south-north width, a small excavator is adopted to excavate a circle of reverse filtering drainage ditches 4 around the site, 6 reverse filtering drainage ditches 4 in south-north direction are additionally arranged in the middle, the bottom width of the ditches is 40cm, the top width is 60cm, and the depth is 60cm.
The reverse filtering drainage ditch 4 is drained to the original river channel, the ditch pond or the artificial wetland through one or more water ditches, and can drain to a separately arranged purifying pond if the reverse filtering drainage ditch is far away from the original river channel, the ditch pond or the artificial wetland. The water guide and the purification tank are not shown in the drawings.
The reverse filtering drainage ditch 4 of the project is drained into the nearby highway ditches through one or more water channels and is used as a construction water source of nearby building plates under construction.
(3) Laying a bottom protective layer 3: the bottom protection layer 3 comprises a bottom geotextile, a middle geotextile film and an upper geotextile, and the bottom protection layer 3 should cover all areas inside the outer edge of the inverted filter drainage ditch 4. The geomembrane of the bottom protective layer 3 mainly plays a role of water isolation, protects the land from being polluted by sewage, and geotextiles above and below the geomembrane are used for protecting the geomembrane from being pierced by sharp objects.
(4) The filtering material is filled in the reverse filtering drainage ditch 4 in three layers, the filtering material consists of coarse sand, small stones and big stones, the grain size of the coarse sand is larger than 0.5mm, the grain size of the small stones is 5-20mm, and the grain size of the big stones is 30-60mm. The thickness of the lower layer filtering material is 20-35cm, and the ratio of small stones to coarse sand=1:2 (volume ratio); the thickness of the middle layer filter material is 20-35cm, the thickness of the small stone and coarse sand=1:1 (volume ratio), and the thickness of the upper layer filter material is 20-30cm, the thickness of the small stone and large stone and coarse sand=1:1:1 (volume ratio).
(5) Paving a bottom hole reverse filtering structure 2: the bottom hole reverse filtering structure 2 comprises a bottom hole reverse filtering layer 7 and a bottom hole geotextile 6; paving a bottom hole reverse filtering layer 7 in an area surrounded by the inner edge of the reverse filtering drainage ditch 4; the bottom hole reverse filtering layer 7 is divided into three layers, namely a coarse sand layer, a small stone layer and a large stone layer from bottom to top, wherein the thickness of each layer is 10-15cm, the grain size of coarse sand is larger than 0.5mm, the grain size of small stone is 5-20mm, and the grain size of large stone is 30-60mm. And (3) laying and flattening the layers in layers, and then laying a bottom hole geotextile 6 on the upper part of the bottom hole reverse filter layer 7. To ensure the flatness of the whole construction site, the bottom hole inverted filter 7 may also partially or entirely cover the inverted drain 4.
(6) Setting a reverse filtering surrounding well body 1: a first layer of tyre-shaped geotechnical pipe bags 5 are placed on the bottom hole geotechnical cloth 6, the bag body of the tyre-shaped geotechnical pipe bags 5 is made of a whole geotechnical cloth, as shown in fig. 3 and 4, the whole bag body only has a transverse interface 8 and a longitudinal interface 9, and the longitudinal interface 9 is positioned in the middle of the inner ring; the upper part of the bag body is provided with a plurality of filling openings 10. The transverse joint 8 and the longitudinal joint 9 are all obtained by adopting the existing sewing or welding method, wherein the lap joint width of the transverse joint 8 is larger than 20cm, and the lap joint width of the longitudinal joint 9 is larger than 10cm. Through the on-site tearing test of constructors, the tearing resistance of the lap joint is not smaller than that of geotextile, and the construction requirement of the invention is completely met. The geotechnical pipe bag is similar to an automobile tire in shape after filling with the filler, so the geotechnical pipe bag is named as a tire-shaped geotechnical pipe bag. The stress structure is reasonable, and the well body of the well is very stable because of the closed ring shape, and the bag body is not broken.
The filler 11 in the tyre-shaped geotechnical pipe bag 5 consists of fully and uniformly mixed small stones and coarse sand, wherein the particle size of the coarse sand is larger than 0.5mm, and the particle size of the small stones is 5-20mm, and the ratio of the small stones to the coarse sand is 1:1 (volume ratio). Filling the filler 11 by a bagging machine or filling by a sand pump.
The specifications of the tire-shaped geotechnical pipe bags 5 are various, the wheel diameter of the tire-shaped geotechnical pipe bags 5 adopted in the Wen province project (namely the inner diameter of the reverse filtration surrounding well body 1) is 10m, and the diameter of the cross section of the bag body is 0.5m.
The Wen Ting lake project adopts a small sand pump to fill the filler 11, so that dust pollution on a construction site is avoided, and the filling speed is high. Pouring small stones and coarse sand with the volume ratio of 1:1 into a stirring pool, adding water, stirring uniformly, filling through a filling port 10 on the bag body by using a sand pump, wherein the volume of the filled filling material 11 is 70-80% of the volume of the bag body of the tire-shaped geotechnical pipe bag 5. After compaction by a manual or small compactor, the bag body is elliptical in section.
When the conventional reverse filtering surrounding well is used for emergency protection of piping dangerous situations, the effective aperture of the reverse filtering geotechnical cloth at the bottom of the reverse filtering surrounding well is generally not more than 0.20mm in order to prevent sand from being filled with water. In the prior art, when the geotechnical cloth bag is adopted to directly filter the silt, the effective aperture of the geotechnical cloth is generally not more than 0.20mm. In the method, the inventor uses geotechnical cloth with different effective apertures to perform a silt water permeability test, and discovers that when the effective aperture of the geotechnical cloth 6 at the bottom of the well is smaller than 0.35mm, the earlier stage water permeability speed can also be achieved, but the later stage water permeability speed is easy to block, the water permeability speed is greatly reduced after 30 hours, and the water is basically not permeated after 50 hours, so that the water content of the silt at the bottom of the well is not in accordance with the secondary use requirement. When the effective aperture is larger than 0.35mm, the water permeable speed is high, the blockage is not easy, the water permeable capacity is long in retention time, the sludge filtrate is filtered by the lower bottom reverse filtering layer 7 and the reverse filtering drainage ditch 4, and the soil retaining performance can also meet the requirements. The tyre-shaped geotechnical pipe bag 5 is filled with the filler 11, so that the water permeability of the bag body is not smaller than that of the geotechnical cloth 6 at the bottom of the well. Therefore, the effective aperture of the bottom hole geotextile 6 adopted by the invention should be more than or equal to 0.35mm, and the geotextile of the tyre-shaped geotextile tube bag 5 should be more than or equal to 0.40mm. The geotextile 6 at the bottom of the well and the geotextile of the tyre-shaped geotextile tube bag 5 in the Wen Ting lake project adopt 465g/m 2 The domestic high-strength polyester woven geotextile has an effective aperture of 0.46mm. The geotechnical cloth of this model intensity is higher, through the practical application demonstration of venturi and lake project, can satisfy the intensity needs of big wheel footpath tire shape geotechnical pipe bag completely, and the tear resistance intensity of interface is not less than geotechnical cloth's tear resistance intensity, and silt dehydration is fast, is difficult for taking place to block up, and silt filtrate accords with the requirement.
(7) A second layer of tyre-shaped geotechnical bags 5 is placed on the first layer of tyre-shaped geotechnical bags 5, and the filling material 11 is filled.
(8) Repeating the steps (6) - (7) until the height of the reverse-filtering surrounding well body 1 meets the design requirement. The height of the Wen Ting lake project reverse filtration surrounding well body 1 is 2.8-3.1 m.
(9) Repeating the steps (6) - (8), and arranging a plurality of reverse filtering surrounding well bodies 1.
(10) Pumping the sludge: sludge is pumped by a small dredger slurry pump and sequentially input into a plurality of reverse-filtering surrounding well bodies 1.
(11) Mixing the sand and the silt into building materials: when the water content of the sludge in the reverse-filtering surrounding well body 1 meets the requirement, the sludge is mixed with the sand and stone materials of the reverse-filtering surrounding well body 1 and the bottom reverse-filtering structure 2 by a small excavator, and the mixture is placed for a week to be used as a building material for the second time. The dehydrated sludge mixed with the sand stone has greatly improved porosity, can be basically dried in the sun for about one week, and can be used as a building material for secondary use. After the tyre-shaped geotechnical pipe bag 5 is placed under the outdoor sunshade for a period of time, a manual or small excavator can easily break the bag body, and sand in the bag body are mixed with sludge in the surrounding well.
In the dredging engineering of new western ditch white floating section of east fish and river tributaries, as the two beach lands of the river are farmlands, the place for storing the silt is very narrow, and the river levee is also dredged by the method of the invention due to the long-term repair of large water in the future, the disturbance to local agriculture is hardly caused, and the treated silt is also used for repairing the river levee nearby after being mixed with sand and stone in construction, thereby saving the occupation compensation cost and the silt transportation cost of a large pen.
Claims (2)
1. A method for treating dredging sludge using a reverse-filtering surrounding well, comprising the steps of:
(1) Cleaning a field: selecting a site for treating sludge, and cleaning and leveling the site;
(2) And excavating a reverse filtering drainage ditch (4): surrounding the periphery of a field, excavating a reverse filtering drainage ditch (4), wherein the section of the reverse filtering drainage ditch (4) is trapezoid, the bottom width is 40cm-80cm, the top width is 60-120cm, and the depth is 60cm-100 cm;
the reverse filtering drainage ditch (4) is drained to an original river channel, a ditch pond or an artificial wetland through one or more water ditches, and is drained to a separately arranged purifying pond if the reverse filtering drainage ditch is far away from the original river channel, the ditch pond or the artificial wetland;
(3) Laying a bottom protective layer (3): the bottom protective layer (3) comprises geotextile of a bottom layer, a geotextile of a middle layer and geotextile of an upper layer, and the bottom protective layer (3) is used for covering all areas within the outer edge of the reverse filtering drainage ditch (4);
(4) The filtering materials are filled in three layers in the reverse filtering drainage ditch (4): the thickness of the lower layer filtering material is 20-35cm, and the ratio of small stones to coarse sand=1:2 (volume ratio); the thickness of the middle layer filtering material is 20-35cm, the thickness of the small stone and coarse sand=1:1 (volume ratio), the thickness of the upper layer filtering material is 20-30cm, the thickness of the small stone and large stone and coarse sand=1:1:1 (volume ratio); the grain size of the coarse sand is larger than 0.5mm, the grain size of the small stone is 5-20mm, and the grain size of the big stone is 30-60mm;
(5) Paving a bottom hole reverse filtering structure (2): the bottom hole reverse filtering structure (2) comprises a bottom hole reverse filtering layer (7) and a bottom hole geotextile (6); firstly, paving a bottom hole reverse filtering layer (7) in an area surrounded by the inner edge of a reverse filtering drainage ditch (4); the bottom hole reverse filtering layer (7) is divided into three layers, namely a coarse sand layer, a small stone layer and a large stone layer from bottom to top, wherein the thickness of each layer is 10-15cm, the grain size of coarse sand is larger than 0.5mm, the grain size of small stone is 5-20mm, and the grain size of large stone is 30-60mm; layering and flattening, and then paving a bottom geotechnical cloth (6) on the upper part of the bottom reverse filtering layer (7), wherein the effective aperture of the bottom geotechnical cloth (6) is more than or equal to 0.35mm;
(6) Setting a reverse filtering surrounding well body (1): a first layer of tyre-shaped geotechnical pipe bags (5) are placed on the bottom hole geotechnical cloth (6), the bag body of the tyre-shaped geotechnical pipe bags (5) is made of a whole geotechnical cloth, and the whole bag body is provided with a transverse interface (8) and a longitudinal interface (9), and the longitudinal interface (9) is positioned in the middle of the inner ring; the upper part of the bag body is provided with a plurality of filling openings (10); the effective aperture of geotextile for manufacturing the tyre-shaped geotextile tube bag (5) is larger than 0.40mm;
pouring small stones and coarse sand with the volume ratio of 1:1 into a stirring pool, adding water, stirring uniformly, and using the mixture as a filling material (11), and filling the filling material (11) into the bag body through a filling opening (10) on the bag body by using a sand pump, wherein the volume of the filled filling material (11) is 70-80% of the volume of the bag body of the tire-shaped geotechnical pipe bag (5); the grain diameter of the coarse sand is larger than 0.5mm, and the grain diameter of the small stone is 5-20mm;
(7) Placing a second layer of tyre-shaped geotechnical pipe bags (5) on the first layer of tyre-shaped geotechnical pipe bags (5), and filling the filling materials (11);
(8) Repeating the steps (6) - (7) until the height of the reverse-filtering surrounding well body (1) meets the design requirement;
(9) Repeating the steps (6) - (8), and arranging a plurality of reverse filtering surrounding well bodies (1) in the area surrounded by the reverse filtering drainage ditch (4);
(10) Pumping the sludge: pumping water bottom sludge of a river channel, a ditch pond or an artificial wetland, and sequentially inputting the water bottom sludge into a plurality of reverse filtration surrounding well bodies (1);
(11) Mixing the sand and the silt into building materials: when the water content of the sludge in the reverse filtering surrounding well body (1) meets the requirement, mixing the sludge with the reverse filtering surrounding well body (1) and the sand and stone materials of the bottom hole reverse filtering structure (2) together to be used as a building material for secondary use.
2. Method for treating dredging sludge with counter-filtering surrounding wells according to claim 1, characterized in that the transverse interface (8) has a lap width of more than 20cm and the longitudinal interface (9) has a lap width of more than 10cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111575680.6A CN114809231B (en) | 2021-12-22 | 2021-12-22 | Method for treating dredging sludge by reverse filtering surrounding well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111575680.6A CN114809231B (en) | 2021-12-22 | 2021-12-22 | Method for treating dredging sludge by reverse filtering surrounding well |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114809231A CN114809231A (en) | 2022-07-29 |
| CN114809231B true CN114809231B (en) | 2023-12-19 |
Family
ID=82527482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111575680.6A Active CN114809231B (en) | 2021-12-22 | 2021-12-22 | Method for treating dredging sludge by reverse filtering surrounding well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114809231B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE20007226U1 (en) * | 2000-04-20 | 2000-08-17 | Rochem Ro Wasserbehandlung Gmbh | Device for filtering and separating in particular biologically organic flow media |
| CN204212104U (en) * | 2014-11-15 | 2015-03-18 | 张胜杰 | A kind of combined type anti-filter encloses well |
| CN107916648A (en) * | 2017-11-16 | 2018-04-17 | 黑龙江省水利水电勘测设计研究院 | A kind of processing method of anti-flood season embankment |
| CN212103909U (en) * | 2020-03-24 | 2020-12-08 | 黄河水利职业技术学院 | Cambered surface overlap joint is from anti-well that strains that blocks water |
| CN214613890U (en) * | 2021-03-24 | 2021-11-05 | 长江水利委员会长江科学院 | Integral flexible water-filling surrounding well for piping emergency |
-
2021
- 2021-12-22 CN CN202111575680.6A patent/CN114809231B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE20007226U1 (en) * | 2000-04-20 | 2000-08-17 | Rochem Ro Wasserbehandlung Gmbh | Device for filtering and separating in particular biologically organic flow media |
| CN204212104U (en) * | 2014-11-15 | 2015-03-18 | 张胜杰 | A kind of combined type anti-filter encloses well |
| CN107916648A (en) * | 2017-11-16 | 2018-04-17 | 黑龙江省水利水电勘测设计研究院 | A kind of processing method of anti-flood season embankment |
| CN212103909U (en) * | 2020-03-24 | 2020-12-08 | 黄河水利职业技术学院 | Cambered surface overlap joint is from anti-well that strains that blocks water |
| CN214613890U (en) * | 2021-03-24 | 2021-11-05 | 长江水利委员会长江科学院 | Integral flexible water-filling surrounding well for piping emergency |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114809231A (en) | 2022-07-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102733349B (en) | Method for de-silting lake and constructing lake center island | |
| KR100932091B1 (en) | Method and device establishig reclaimed land of a sea wall and device installing | |
| CN111593742B (en) | Construction method for rectifying and improving tailing pond based on rubble silt squeezing method | |
| CN104711968A (en) | Negative-pressure three-dimensional flow-guiding disturbance impact solidification dredger filling method | |
| CN114809231B (en) | Method for treating dredging sludge by reverse filtering surrounding well | |
| CN114349294B (en) | Reverse filtering surrounding well structure for treating dredging sludge | |
| CN206752629U (en) | A kind of municipal works rainwater inspection well | |
| CN211646491U (en) | Base seepage-proofing structure for restoring ecological environment of mine | |
| CN113235523A (en) | Construction method of river channel ecological management diversion channel | |
| CN216457451U (en) | River channel dredging polluted soil storage and disposal structure | |
| KR100429370B1 (en) | Method for constructing revetment dike using a fiber for public works | |
| CN114150649B (en) | Annular cavity lattice earthwork tube bag storage sludge retaining structure | |
| CN216920429U (en) | Hold silt retaining structure | |
| CN214881044U (en) | Quick dewatering device for environment-friendly dredging sludge of lakes and rivers | |
| CN114482086B (en) | Construction method of supporting and retaining structure for storing sludge | |
| CN114427230B (en) | Ring type cavity lattice earthwork tube bag structure | |
| CN217758883U (en) | Environment-friendly earth-rock cofferdam structure of primary drinking water source protection area | |
| CN216948360U (en) | Geotechnical pipe bag | |
| CN218779507U (en) | A slot structure that is used for many silt regions of high water level to manage construction | |
| CN217443338U (en) | High-efficient soil and groundwater risk management and control system | |
| CN219100013U (en) | Drainage device for hydraulic engineering foundation treatment | |
| CN108658208A (en) | Tailing water water course in situ purifying processing device | |
| CN215841761U (en) | Simple sedimentation tank suitable for large flow behind weir | |
| CN211080266U (en) | Coastal waters soft soil foundation cofferdam structure of permeating water | |
| RU2368728C1 (en) | Method for erection of hydraulic fill dam on water-permeable foundation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |