A geotextile bag that can be rapidly dewatered and methods of using the same

Abstract

The application discloses a geotechnical membrane bag capable of rapid dehydration and a use method thereof. The geotechnical membrane bag comprises a bag body, an electro-osmosis system and a filtering system. The bag body is provided with a grouting opening and a drainage opening. The electro-osmosis system comprises an anode plate, a cathode plate and a direct current power supply. The anode plate and the cathode plate are arranged in the interior of the bag body and located at two ends of the bag body. The positive electrode and the negative electrode of the direct current power supply are connected to the anode plate and the cathode plate through wires respectively. The filtering system comprises a pair of filter screens. The filter screens are arranged in the interior of the bag body and located at two ends of the bag body. The anode plate and the cathode plate are located between the filter screens and the end portions of the bag body. The geotechnical membrane bag provided by the application can realize rapid dehydration and improve work efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of slurry dewatering, in particular to a geotextile membrane bag capable of rapid dewatering and a use method thereof. BACKGROUND

[0002] Silt generally has the properties of high water content, large compressibility and low strength, and presents the flow and suspension state of soil body. However, the traditional treatment methods for silt such as vacuum preloading and surcharge preloading have poor effects in ground treatment, and are difficult to meet the requirements of engineering construction on ground strength and deformation.

[0003] The geotextile membrane bag is a large-area continuous bag-shaped material made of geotextile, and concrete or cement mortar is injected into the geotextile membrane bag through a high-pressure pump to make the concrete or cement mortar solidify and form a plate-shaped structure or other shaped structure with certain strength. The existing geotextile membrane bag is mostly directly stacked on the top of the silt pool in the project, and has the characteristics of simple treatment, wide use and strong applicability. However, the ordinary geotextile membrane bag has its inherent limitations in treating pipeline silt and dredged silt. First, only relying on the natural deposition of silt and the superposition of the geotextile membrane bag for drainage, it takes one to two months to drain, and the drainage speed is far from the ideal requirement, which leads to an unobvious dewatering effect, and further has a certain adverse effect on the construction period. This increases the time cost and economic cost, and therefore is not suitable for urgent and complex ground reinforcement projects. Second, only relying on the superposition and extrusion of the geotextile membrane bag for dewatering treatment, the water quality discharged is turbid and difficult to be reused, and needs to be treated additionally.

[0004] Therefore, how to quickly and effectively dewater the geotextile membrane bag is a technical problem to be solved. SUMMARY

[0005] The first object of the present application is to provide a geotextile membrane bag capable of rapid dewatering, which can realize rapid dewatering and improve work efficiency.

[0006] The second object of the present application is to provide a use method of the geotextile membrane bag capable of rapid dewatering.

[0007] In order to solve the above technical problems, the present application provides the following technical solutions:

[0008] The first aspect of the present application provides a geotextile membrane bag capable of rapid dewatering, comprising:

[0009] a bag body, wherein a grouting port and a drainage port are arranged on the bag body;

[0010] An electro-osmosis system comprises an anode plate, a cathode plate and a direct current power source, the anode plate and the cathode plate are arranged inside the bag body and located at two ends of the bag body, the positive and negative poles of the direct current power source are connected to the anode plate and the cathode plate through wires respectively; and

[0011] A filtration system comprises a pair of filter screens, the pair of filter screens are arranged inside the bag body and located at two ends of the bag body, and the anode plate and the cathode plate are located between the filter screens and the end of the bag body.

[0012] Further, a grouting valve is arranged on the grouting port, and a drainage valve is arranged on the drainage port.

[0013] Further, the two ends of the bag body comprise a first end face and a second end face, the anode plate and the cathode plate are located close to the first end face and the second end face respectively, and the drainage port is arranged on the second end face.

[0014] Further, the anode plate is made of a ruthenium-iridium-titanium plated plate, the cathode plate is made of a titanium screen, and the direct current power source is a RIGOL programmable linear direct current power source DP832.

[0015] Further, the anode plate and the cathode plate each comprise an electrode plate and an electrode sheet connected to the electrode plate;

[0016] The two side faces of the electrode plate are formed with grooves, and the corresponding parts of the bag body have protruding parts matched with the grooves; the protruding parts are embedded in the grooves on the electrode plate by pressing, so that the anode plate and the cathode plate are fixedly connected to the bag body;

[0017] The electrode sheet protrudes from the bag body and is connected to the direct current power source through a wire.

[0018] Further, the filter screens comprise a first filter screen and a second filter screen, the pore size of the first filter screen is larger than that of the second filter screen; the first filter screen and the second filter screen are arranged in sequence from the inside of the bag body towards the electrode plate.

[0019] Further, the pore size of the first filter screen is 0.2-0.3 mm, and the pore size of the second filter screen is 0.15-0.18 mm.

[0020] Further, the filtration system further comprises a gravel layer, the gravel layer is located between the cathode plate and the second end face.

[0021] Further, the gravel layer is composed of gravels with a diameter of 1.9-3 cm.

[0022] The second aspect of the present application provides a method for using a geomembrane bag, the geomembrane bag being the quick dewatering geomembrane bag described above; the method comprises the following steps:

[0023] S1. opening the grouting port of the bag body, and grouting into the bag body through the grouting port;

[0024] S2. opening the drainage port on the bag body, starting the direct current power supply, and performing the electro-osmotic dewatering treatment;

[0025] S3. after the dewatering is completed, the direct current power supply is turned off.

[0026] Further, in step S2, the electro-osmotic dewatering treatment is performed in an intermittent power-on mode until no water flows out of the drainage port; the intermittent power-on mode is that: after each power-on for 20-40 min, power-off for 5-10 min; and / or,

[0027] After the dewatering is completed, whether the consolidation of the silt in the bag body meets the strength requirement is tested; if the requirement is not met, 1-2 times of intermittent power-on is performed again after waiting for 5-30 min until the silt meets the strength requirement.

[0028] Compared with the prior art, the present application has the following beneficial effects:

[0029] 1. The novel geomembrane bag provided by the present application adds an electro-osmotic system and a filtering system in a conventional geomembrane bag, and the dewatering is promoted by the electro-osmotic effect, so that not only the quick dewatering of the slurry in the bag can be realized, but also the reinforcement of the slurry can be realized; the filtering system can not only reduce the impact of the large particles and silt in the slurry on the electrode plates, but also prevent the soil particles from flowing out during the dewatering.

[0030] 2. Compared with the existing geomembrane bag, the geomembrane bag provided by the present application has clearer water quality when dewatering, and the water can be reused without additional treatment. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 FIG. 1 is a structural schematic diagram of the geomembrane bag in an embodiment of the present application;

[0032] Figure 2 FIG. 2 is a structural schematic diagram of the anode plate in the geomembrane bag shown in FIG. 1; Figure 1

[0033] Figure 3 FIG. 3 is a structural schematic diagram of the cathode plate in the geomembrane bag shown in FIG. 1; Figure 1

[0034] Figure 4 FIG. 4 is a connection schematic diagram between the anode plate and the bag body;

[0035] Figure 5 FIG. 5 is a structural schematic diagram of the first filter screen and the second filter screen.​​

[0036] 100, bag body; 101, grouting port; 102, grouting valve; 103, drainage port; 104, drainage valve; 105, protruding part; 200, direct current power supply; 2001, display screen; 2002, power switch; 201, anode plate; 2011, electrode plate; 2012, electrode sheet; 2013, groove; 202, cathode plate; 203, wire; 301, first filter screen; 302, second filter screen; 303, gravel layer. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described in connection with the drawings and the embodiments of the present application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this description, the singular forms "a", "an" and "the" include plural references unless the context clearly dictates otherwise. The term "and / or" includes any and all combinations of one or more of the associated listed items.

[0039] As described in the background, for the existing geomembrane bag, if only relying on the stacking and extrusion of the geomembrane bag itself to perform dehydration treatment, not only the drainage speed is slow, the dehydration effect is not obvious, but also the water quality discharged is relatively turbid, which is difficult to be reused and needs to be additionally treated.

[0040] In view of the technical problem, the present application provides a new type of geomembrane bag which utilizes electro-osmosis to assist dehydration, thereby greatly improving the dehydration speed of the geomembrane bag.

[0041] Please refer to Figure 1 The geomembrane bag of an embodiment of the present application comprises a bag body 100, an electro-osmosis system and a filtration system.

[0042] Specifically, the bag body 100 is a commonly used geomembrane bag which can be made of polymeric synthetic material, and preferably has a double-layer structure, and has the properties of being solid and water-permeable but mud-impermeable. A grouting port 101 is formed on the upper surface of the bag body 100 for injecting mud into the bag body 100, and the grouting port 101 is preferably arranged at the center of the upper surface of the bag body 100. In some embodiments, a grouting valve 102 is arranged on the grouting port 101, and the grouting valve 102 can be closed after the grouting is completed.

[0043] A drainage port 103 is arranged on the right side surface of the bag body 100 for draining water during dehydration treatment. In some embodiments, a drainage valve 104 is arranged on the drainage port 103.

[0044] Please refer to Figure 1The electro-osmosis system comprises an anode plate 201, a cathode plate 202, a direct current power supply 200 and a wire 203. The anode plate 201 and the cathode plate 202 are both located inside the bag body 100 and at two ends of the bag body 100. The positive and negative poles of the direct current power supply 200 are connected to the anode plate 201 and the cathode plate 202 through the wire 203, thereby forming a closed loop.

[0045] Please refer to Figures 2-3 The anode plate 201 and the cathode plate 202 both comprise an electrode plate 2011 and an electrode sheet 2012 connected to the electrode plate 2011. The electrode plate 2011 is located inside the bag body 100, while the electrode sheet 2012 protrudes from the bag body 100 and is connected to the direct current power supply 200 through the wire 203. The anode plate 201 is located close to the left side of the bag body 100, while the cathode plate 202 is located close to the right side of the bag body 100 and opposite to the drain 103.

[0046] Please refer to Figures 2-3 In the preferred embodiment, the two side faces of the electrode plate 2011 are formed with grooves 2013, and the corresponding parts of the bag body 100 are provided with protrusions 105 matching the grooves 2013. The protrusions 105 are embedded in the grooves 2013 on the electrode plate 2011 by pressing, thereby firmly fixing the anode plate 201 and the cathode plate 202 to the bag body 100 and preventing the electrode plate 2011 from being easily separated during operation.

[0047] Preferably, the anode plate 201 and the cathode plate 202 are both made of titanium, which is a kind of inert material with high strength, low density and corrosion resistance. Titanium has the properties of high temperature resistance, low temperature resistance, strong acid resistance and strong alkali resistance. Further, the anode plate 201 is made of a high-purity titanium plate coated with ruthenium and iridium, and the cathode plate 202 is made of a high-purity titanium mesh. Figure 3 In the cathode plate 202, the black part is a titanium plate, and the mesh part is a titanium mesh.

[0048] In some embodiments, the conductive wire can be a common RVV cable with two copper core soft wires and a light polyvinyl chloride sheath, which has the characteristics of economy, saving and strong applicability.

[0049] In some embodiments, the direct current power supply 200 can be a RIGOL programmable linear direct current power supply DP832, which can stably output constant voltage and constant current. The maximum output voltage of each channel is 30V, and the maximum output current is 3A. Specifically, the direct current power supply 200 can include a display screen 2001, a power switch 2002, positive and negative polar holes.

[0050] Please refer to Figure 1 and Figure 5The filter system comprises a pair of filter screens, which are arranged inside the bag body 100 and located at two ends of the bag body 100, and the anode plate 201 and the cathode plate 202 are located between the filter screens and the end of the bag body 100. The filter screens can be made of polyester and the like, and the purpose is to intercept the particles in the slurry during grouting, and at the same time reduce the impact of the sludge on the electrode plate 2011.

[0051] In a preferred embodiment, the filter screens comprise a first filter screen 301 and a second filter screen 302, wherein the pore size of the first filter screen 301 is larger than that of the second filter screen 302, and the first filter screen 301 and the second filter screen 302 are arranged in sequence from the inside of the bag body 100 towards the electrode plate 2011. In this way, the two filter screens can sequentially intercept different sizes of particles in the slurry, and can achieve better protection of the electrode plate 2011 to prevent impact. The specific pore size of the first filter screen 301 and the second filter screen 302 depends on the requirements of the project, the type of soil and the geographical conditions. In some embodiments, the pore size of the first filter screen 301 can be 0.2-0.3mm, for example, it can be 0.2mm, 0.22mm, 0.24mm, 0.25mm, 0.28mm, 0.3mm, etc.; the pore size of the second filter screen 302 can be 0.15-0.18mm, for example, it can be 0.15mm, 0.16mm, 0.17mm, 0.18mm, etc. The filter screen with the above pore size range can effectively filter out smaller particles while maintaining good drainage performance.

[0052] In a preferred embodiment, the filter system further comprises a gravel layer 303. Referring to Figure 1 The gravel layer 303 is located between the cathode plate 202 and the right end face of the bag body 100, and is in close proximity to the cathode plate 202. The gravel layer 303 constitutes a drainage layer, and during electro-osmotic dewatering, the water in the slurry can pass through the cathode plate 202, enter the gravel layer 303, and then be discharged through the drainage port 103 on the right side of the bag body 100. The setting of the gravel layer 303 can further filter the water in the slurry and prevent the outflow of soil particles, so that the discharged water is relatively clear and does not need to be treated additionally. The gravel layer 303 is preferably composed of coarse gravel with a diameter of 1.9-3cm. The gravel layer 303 composed of gravel of this size can form more drainage channels, which is conducive to the rapid discharge of water.

[0053] The use method of the novel geomembrane bag provided by the application is as follows:

[0054] S1. Transport the geomembrane bag of the application to the construction site and assemble it.

[0055] S2. Open the grouting valve, and put the grouting pipe into the grouting port, and start grouting; during the grouting, the sludge is accumulated to the two sides of the bag, at this time, the filter screen in the bag intercepts the garbage and large particle substances in the sludge, and reduces the influence on the electrode plate; when the sludge fills the bag, stop grouting, take out the grouting pipe, and close the grouting valve.

[0056] S3. Open the switch of the direct current power supply, and open the drain valve, and carry out electro-osmotic dewatering.

[0057] S4. After dewatering, close the power supply switch, and recover the device.

[0058] In the preferred embodiment, in step S3, the intermittent dewatering can be carried out for multiple times during the dewatering, so as to achieve better dewatering effect. The intermittent dewatering is: adjusting the power supply switch, and electrifying for 20-40 min each time, and resting for 5-10 min. For example, electrifying for half an hour, and resting for 10 min. Repeat for 5-6 times, until no water flows out of the drain port. At the same time, observe whether the sludge consolidation meets the strength requirement, if not, wait for a period of time (for example, 5-30 min), and then carry out intermittent electrification for 1-2 times, until the construction sludge meets the construction requirement.

[0059] In summary, the application provides a novel geotechnical membrane bag capable of rapid dewatering, which promotes dewatering through electro-osmosis, and cannot realize rapid dewatering of the slurry in the membrane bag, and based on the soil reinforcement effect brought by the electro-osmosis method itself, the reinforcement of the slurry can also be realized, so as to improve the strength of the dewatered slurry, and make it meet the construction strength requirement. In addition, compared with the existing geotechnical membrane bag, the geotechnical membrane bag provided by the application has clearer water quality when carrying out electro-osmotic dewatering, and does not need additional treatment, and can be used again.

[0060] The above-mentioned embodiments are only preferred embodiments for fully illustrating the application, and the protection scope of the application is not limited thereto. The equivalent substitutions or transformations made by the person skilled in the art on the basis of the application are within the protection scope of the application. The protection scope of the application is subject to the claims.

Claims

1. A geotextile membrane bag that can be rapidly dewatered, characterized in that, The application relates to a geotextile bag for treating sludge, which comprises the following parts: a bag body provided with a grouting port and a drainage port; an electro-osmosis system comprising an anode plate, a cathode plate and a direct-current power supply, wherein the anode plate and the cathode plate are arranged in the interior of the bag body and located at two ends of the bag body, and the positive electrode and the negative electrode of the direct-current power supply are connected to the anode plate and the cathode plate through wires respectively; and a filtering system comprising a pair of filter screens, wherein the filter screens are arranged in the interior of the bag body and located at two ends of the bag body, and the anode plate and the cathode plate are located between the filter screens and the end portions of the bag body. The two ends of the bag body comprise a first end face and a second end face, the anode plate and the cathode plate are located close to the first end face and the second end face respectively, and the drainage port is arranged on the second end face; the filter screens comprise a first filter screen and a second filter screen, the pore size of the first filter screen is larger than that of the second filter screen; the first filter screen and the second filter screen are arranged in sequence from the interior of the bag body towards the anode plate or the cathode plate; the pore size of the first filter screen is 0.2-0.3 mm, and the pore size of the second filter screen is 0.15-0.18 mm; the filtering system further comprises a gravel layer, which is located between the cathode plate and the second end face; the gravel layer is composed of gravels with a diameter of 1.9-3 cm; the anode plate and the cathode plate each comprise an electrode plate and an electrode sheet connected to the electrode plate; the two side faces of the electrode plate are formed with grooves, and the corresponding parts of the bag body are provided with convex parts matched with the grooves; the convex parts are embedded in the grooves on the electrode plate through press fitting, so that the anode plate and the cathode plate are fixed to the bag body; the electrode sheet protrudes from the bag body and is connected to the direct-current power supply through wires.

2. A geomembrane bag according to claim 1, wherein The grouting port is provided with a grouting valve, and the drainage port is provided with a drainage valve.

3. A method of using a geomembrane bag, characterized by, The geotextile bag is the rapidly dehydrated geotextile bag according to claim 1 or 2; and the use method comprises the following steps: S1. opening the grouting port of the bag body, and grouting into the bag body through the grouting port; S2. opening the drainage port of the bag body, starting the direct-current power supply, and performing electro-osmosis dehydration treatment; S3. after dehydration, stopping the direct-current power supply.

4. The method of using a geomembrane bag according to claim 3, wherein, In step S2, the electro-osmosis dehydration treatment is performed in an intermittent power-on mode until no water flows out of the drainage port; the intermittent power-on mode is that the power is turned off for 5-10 min after the power is turned on for 20-40 min; after dehydration, whether the sludge in the bag body meets the strength requirement is tested; if not, the power is turned on for 1-2 times intermittently after waiting for 5-30 min, until the sludge meets the strength requirement.

Images