Chemical clogging dredging method and device for hydraulic pressure measuring pipe

Abstract

The invention relates to a chemical clogging dredging method and device for a hydraulic pressure measuring pipe. The device comprises the pressure measuring pipe, a liquid storage system, a conveying pipeline system, a power system and a control system. The pressure measuring pipe, the liquid storage system, the power system and the control system are all connected with the conveying pipeline system; the liquid storage system comprises a plurality of independent plastic liquid storage tanks; the power system comprises a high-pressure positive-pressure pump and a negative-pressure suction pump; the high-pressure positive-pressure pump is used for injecting a chemical reagent and clear water into the pressure measuring pipe, and the negative-pressure suction pump is used for pumping water. The method has the advantages that the structure of the pressure measuring pipe is fully utilized, additional complex auxiliary facilities are not needed, cost and construction difficulty are reduced, the method is suitable for various conventional hydraulic engineering scenes, the chemical desilting effect of geotechnical cloth is comprehensively improved, and hydraulic structure seepage monitoring is protected.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline dredging, and more specifically, it relates to a method and device for chemically dredging the silt blockage of a hydraulic piezometer tube. Background Art

[0002] In hydraulic engineering such as sluice stations and dams, the geotextile wrapped around the outer layer of the buried hydraulic piezometer tube plays a key role in filtration. The water permeability of the geotextile ensures the long-term stable operation of the seepage monitoring system of the hydraulic engineering. However, due to the groundwater and the concrete cement hydration liquid environment being rich in compounds such as Ca(OH) 2 etc., its combination with CO in the air 2 is extremely easy to generate crystals such as CaCO 3 etc. inside and on the surface of the geotextile. These crystals not only block the pores of the geotextile, affecting the water intake performance of the piezometer tube, but also may weaken the mechanical properties of the geotextile, threatening the accuracy and stability of the seepage monitoring of hydraulic structures. Currently, there is a lack of effective methods to remove the crystals. Summary of the Invention

[0003] The purpose of the present invention is to address the deficiencies of the prior art and propose a method and device for chemically dredging the silt blockage of a hydraulic piezometer tube.

[0004] In the first aspect, a method and device for chemically dredging the silt blockage of a hydraulic piezometer tube are provided, including:

[0005] A piezometer tube, a liquid storage system, a pipeline system, a power system, and a control system; the piezometer tube, the liquid storage system, the power system, and the control system are all connected to the pipeline system;

[0006] Among them, the liquid storage system includes several independent plastic liquid storage tanks; the power system includes a high-pressure positive pressure pump and a negative pressure suction pump; the high-pressure positive pressure pump is used to inject chemical reagents and clean water into the piezometer tube, and the negative pressure suction pump is used for pumping water; the control system includes a pressure gauge, and the pressure gauge is used to monitor the pressure data during the positive pressure injection and negative pressure pumping processes; the bottom of the piezometer tube is provided with a water inlet hole; the outer layer of the piezometer tube is wrapped with a geotextile.

[0007] Preferably, the high-pressure positive pressure pump is a plunger type high-pressure pump, and the negative pressure suction pump is a rotary vane type vacuum pump.

[0008] Preferably, it further includes: an auxiliary system, and the auxiliary system includes a buffer bottle and a gas filter; the buffer bottle and the gas filter are arranged on the pipeline between the rotary vane type vacuum pump and the piezometer tube.

[0009] Preferably, the pipeline system is made of PTFE material, and the pipelines are hermetically connected.

[0010] Preferably, a sediment prevention device is equipped in the plastic liquid storage tank, and the sediment prevention device is a stirrer or an ultrasonic oscillator.

[0011] Preferably, one end of the rotary vane vacuum pump away from the piezometric tube is connected to a waste liquid storage tank through a pipeline.

[0012] In a second aspect, a method for dredging chemical blockage of a hydraulic piezometric tube is provided, which is executed by the device according to any one of the first aspect, and includes:

[0013] Step 1: Prepare a chemical reagent, which includes an acidic main agent and an auxiliary reagent, and the auxiliary reagent is composed of a buffer solution and an anti-settling agent;

[0014] Step 2: Pretreat the piezometric tube, and the pretreatment includes: endoscopic inspection of the crystallization and integrity of the tube wall and dredging and cleaning of the water inlet holes;

[0015] Step 3: Connect the plastic liquid storage tank containing the chemical reagent to the piezometric tube, and inject the chemical reagent into the piezometric tube;

[0016] Step 4: After the chemical reagent reaction ends, switch to the negative pressure suction mode, and use the rotary vane vacuum pump to extract the waste liquid and residual reagent dissolved with CaCO 3 crystals.

[0017] Preferably, in step 3, the injection of the chemical reagent into the piezometric tube includes:

[0018] Using a high-pressure positive pressure pump, inject the acidic main agent into the piezometric tube, and maintain the pressure in the tube within a certain range to promote the full diffusion of the acidic main agent to all corners of the geotextile and fully react with the CaCO 3 crystals;

[0019] After the acidic main agent reacts for a certain time, switch to inject the auxiliary reagent, and maintain the positive pressure within a certain range to continuously decompose the residual crystals.

[0020] Preferably, in step 4, the positive pressure is briefly reversed intermittently during the suction process.

[0021] The beneficial effects of the present invention are as follows: Based on chemical principles, seepage principles, and basic materials science principles, by precisely adjusting the concentration of the acidic main agent, dilute hydrochloric acid, and matching it with a suitable proportion of corrosion inhibitor, not only is the dissolving power ensured, but also the corrosion of geotextile fibers is reduced, and a precipitation inhibitor can be introduced to prevent secondary precipitation. According to different soil types, the positive and negative pressures are finely adjusted. For example, sandy soil, loam, and clay each have a suitable pressure and flow rate to ensure the efficient penetration of the reagent and the thorough suction of the waste liquid, far exceeding the previous extensive treatment. Moreover, by making full use of the structure of the piezometer tube itself, no additional complex auxiliary facilities are required, reducing costs and construction difficulties, and it is applicable to various conventional water conservancy project scenarios, comprehensively improving the chemical silt removal effect of geotextiles and escorting the seepage monitoring of hydraulic structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. is a schematic structural diagram of a chemical plugging and dredging device for a hydraulic piezometer tube provided by the present invention;

[0023] Figure 2 FIG. is a schematic diagram of the water flow structure around the piezometer tube during positive pressure water injection provided by the present invention;

[0024] Figure 3 FIG. is a schematic diagram of the water flow structure around the piezometer tube during negative pressure pumping provided by the present invention;

[0025] DESCRIPTION OF THE REFERENCE NUMERALS: 1 - plastic liquid storage tank; 2 - plunger high-pressure pump; 3 - valve; 4 - pressure gauge; 5 - buffer bottle; 6 - gas filter; 7 - rotary vane vacuum pump; 8 - waste liquid storage tank; 9 - piezometer tube; 10 - water inlet hole; 11 - geotextile. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following further describes the present invention in conjunction with embodiments. The description of the following embodiments is only for helping to understand the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0027] Embodiment 1:

[0028] To solve the problems of the prior art, Embodiment 1 of the present application provides a method and device for chemically plugging and dredging a hydraulic piezometer tube, aiming to effectively remove crystal blockages, ensure that the seepage around the piezometer tube can smoothly pass through the geotextile, reduce the risk of erosion of the geotextile and the piezometer tube, extend their service life, and enable water conservancy project managers to promptly detect abnormal fluctuations in the groundwater level based on accurate data, providing guarantee for the operation safety of large reservoirs and dams.

[0029] Specifically, the device includes:

[0030] A piezometer 9, a liquid storage system, a pipeline conveying system, a power system, and a control system; the piezometer 9, the liquid storage system, the power system, and the control system are all connected to the pipeline conveying system

[0031] Among them, the liquid storage system includes several independent plastic liquid storage tanks 1; the power system includes a high-pressure positive pressure pump and a negative pressure suction pump; the high-pressure positive pressure pump is used to inject chemical reagents and clean water into the piezometer 9, and the negative pressure suction pump is used for pumping water; a water inlet hole 10 is provided at the bottom of the piezometer 9; the outer layer of the piezometer 9 is wrapped with geotextile 11.

[0032] In the power system, the high-pressure positive pressure pump is a plunger type high-pressure pump 2, which can generate stable and sufficient pressure to accurately inject chemical reagents and clean water into the piezometer. The pressure adjustment range of this pump is wide, and the output pressure can be accurately adjusted according to different soil types and dredging requirements to ensure the ideal penetration effect of the reagent and clean water in the soil. The negative pressure suction pump is a rotary vane vacuum pump 7, which is used to generate negative pressure for pumping water. Its negative pressure intensity can be adjusted, and it can quickly and effectively pump out the waste liquid and excess water in the piezometer according to the actual situation, ensuring the high efficiency and thoroughness of the dredging process.

[0033] Exemplarily, a plunger type high-pressure pump with corrosion resistance and accurate and controllable flow rate is selected. Its flow rate adjustment range is 0.5 - 300 ml / min, and the pressure output range is 0 - 0.3 MPa, which can meet the requirements for the injection flow rate and positive pressure of the reagent under different soil types. The pump body material is stainless steel or engineering plastic to resist the corrosion of acidic reagents. In addition, a rotary vane vacuum pump is selected, with an air extraction rate of 10 - 30 L / min and an ultimate vacuum degree of less than -0.1 MPa, ensuring effective suction of waste liquid under different working conditions. A buffer bottle is connected to the air inlet of the vacuum pump to prevent waste liquid backflow from damaging the pump body. A gas filter is provided between the buffer bottle and the vacuum pump to filter water vapor and impurities during the suction process. The suction pipeline also uses acid and alkali resistant PTFE hoses to ensure the smooth extraction of waste liquid.

[0034] In the pipeline system, the pipeline for conveying chemical reagents is usually made of acid and alkali resistant materials such as PTFE (polytetrafluoroethylene), which has good chemical stability, can effectively prevent the pipeline from being corroded by acidic or alkaline reagents, extend the service life of the device, and ensure the safety and stability of the reagent conveying process. Moreover, the pipelines are connected by a high-precision sealing connection method, such as the ferrule connection method, and acid and alkali resistant sealing gaskets are used to ensure that the entire conveying system will not leak under positive pressure and negative pressure states, ensuring the conveying efficiency and accuracy of the reagent and water.

[0035] Exemplarily, the connecting pipe uses an acid and alkali resistant polytetrafluoroethylene (PTFE) hose to ensure smooth reagent transportation and withstand a certain pressure. The pipe joints are equipped with quick-connect stainless steel joints with good sealing performance, which are convenient for connecting to the water inlet hole of the piezometer and the liquid storage tank.

[0036] The multi-chamber liquid storage tank in the liquid storage system is used to store chemical reagents, clean water, and recycled waste liquid respectively. Each chamber has clear identification and liquid level monitoring devices, which facilitate operators to understand the storage volume of each liquid in real time, and are convenient for timely replenishment of reagents and treatment of waste liquid. Moreover, in the chamber for storing chemical reagents, an anti-precipitation device, such as a stirrer or an ultrasonic oscillator, is equipped to prevent the components in the chemical reagents from precipitating, ensure the uniformity and stability of the reagents, and ensure that the reagents injected each time have consistent effects.

[0037] Exemplarily, the body of the plastic liquid storage tank is marked with scales for accurate measurement of the reagent dosage. The top is provided with a vent hole and a sealing cover to prevent the solution from volatilizing and impurities from mixing in. Pour clean water, buffer reagent, and acidic reagent into the liquid storage bottle in sequence, and avoid reacting the reagents in one bottle to affect the descaling effect.

[0038] The control system includes a high-precision pressure gauge 4, and the pressure gauge 4 is used to monitor the pressure data during the positive pressure injection and negative pressure pumping processes.

[0039] Embodiment 2:

[0040] On the basis of Embodiment 1, Embodiment 2 of the present application provides a more specific method and device for dredging chemical blockage of a hydraulic piezometer, as Figure 1 shown, the device includes: a piezometer 9, a liquid storage system, a conveying pipeline system, a power system, a control system, and an auxiliary system.

[0041] The auxiliary system includes a buffer bottle 5 and a gas filter 6; the buffer bottle 5 and the gas filter 6 are arranged on the pipeline between the rotary vane vacuum pump 7 and the piezometer 9. The filtering device composed of the buffer bottle 5 and the gas filter 6 can effectively filter out the air and particulate matter in the waste liquid, prevent them from entering the vacuum pump or flowing back to the liquid storage tank, and then be discharged after treatment, avoiding secondary pollution to the device and the soil.

[0042] In addition, as Figure 1 shown, one end of the rotary vane vacuum pump 7 far from the piezometer 9 is connected to a waste liquid storage tank 8 through a pipeline. A number of valves 3 are arranged on the conveying pipeline system.

[0043] It should be noted that the parts that are the same or similar to those in Embodiment 2 in this embodiment can be referred to each other, and will not be elaborated in this application.

[0044] Embodiment 3:

[0045] Based on Embodiments 1 and 2, Embodiment 3 of the present application provides a method for dredging chemical blockage of a hydraulic piezometer tube. This method is based on chemical principles, seepage principles, and basic principles of materials science. It uses positive-pressure water to press a clear aqueous solution into the periphery of the piezometer tube to dilute the crystalline substances, and applies negative-pressure water in the piezometer tube to extract the water containing easily crystallizable substances to reduce the concentration, achieving the purpose of dredging and treatment.

[0046] Before introducing the method of the present application, the following are the basic knowledge principles involved in the present application:

[0047] 1. Chemical principles

[0048] Calcium carbonate dissolution: The core reaction is that dilute hydrochloric acid (HCl) reacts with calcium carbonate (CaCO 3 ) to form crystals, and the chemical equation is CaCO 3 + 2HCl = CaCl 2 + H 2 O + CO 2 ↑. This reaction produces calcium chloride (CaCl 2 ) that is soluble in water, and carbon dioxide (CO 2 ) escapes to assist in loosening the crystals, making the dissolution process more efficient. This is the key chemical step in removing calcium carbonate crystals from geotextiles.

[0049] Buffering effect: The buffer solution contains acetic acid (CH 3 COOH). After the acidic main agent reacts, acetic acid can neutralize the excess hydrogen ions (H + ) and adjust the pH value to prevent the geotextile from being damaged due to excessive acidity. The chemical equation is CH 3 COOH + H + = CH 3 COOH 2 + , and at the same time, acetic acid can also slightly decompose the residual calcium carbonate to continuously clean the crystals.

[0050] 2. Seepage principles

[0051] Darcy's law is the basic law describing the flow of fluids in porous media and is the basis of the entire well flow theory. Its expression is:

[0052]

[0053] In the formula:

[0054] Q is the seepage flow rate, that is, the amount of water passing through the porous medium per unit time, with the unit of m 3 / s;

[0055] K is the permeability coefficient, which reflects the water permeability of the porous medium, with the unit of m / s;

[0056] A is the cross-sectional area of flow, that is, the cross-sectional area perpendicular to the water flow direction, with the unit of m 2 ;

[0057] dh / dl is the hydraulic gradient, that is, the head loss per unit length along the water flow direction, dimensionless. The negative sign indicates that the water flow direction is consistent with the direction of head reduction.

[0058] When pressing acidic solution or clear water into the periphery of the piezometer by applying positive pressure, given the permeability coefficient K, cross-sectional area of flow A, and hydraulic gradient dh / dl of the medium around the piezometer, the flow rate Q of the injected solution can be calculated.

[0059] If the formation where the hydraulic piezometer is located is a confined aquifer and reaches a steady flow state during the pressure water pumping process, the steady flow formula for a fully penetrating well in a confined aquifer (Dupuit formula) can be used:

[0060]

[0061] In the formula:

[0062] Q is the pumping or injection volume, with the unit of m 3 / s;

[0063] K is the permeability coefficient, with the unit of m / s;

[0064] M is the thickness of the confined aquifer, with the unit of m;

[0065] H 0 is the initial head of the aquifer, with the unit of m;

[0066] H is the head at a distance r from the well axis, with the unit of m;

[0067] R is the radius of influence, that is, the radius of the pumping or injection influence range, with the unit of m;

[0068] r is the distance from the calculation point to the well axis, with the unit of m.

[0069] When pressing water into the hydraulic piezometer, if the above parameters are known, the injection volume required to achieve a certain head difference can be calculated; during pumping, the change in the surrounding head under different pumping flow rates can be calculated.

[0070] During the actual pressure water pumping process of the hydraulic piezometer, the water flow is often in an unsteady state. At this time, the Theis formula can be used to describe the unsteady flow situation. The Theis formula is based on the principle of elastic storage and release of groundwater, and the expression is:

[0071]

[0072] Among them:

[0073] s is the drawdown, i.e., the value of the head change caused by pumping or injection, with the unit of m;

[0074] Q is the pumping or injection rate, with the unit of m 3 / s;

[0075] T = KM is the transmissivity, which reflects the water conveyance capacity of the aquifer, with the unit of m 2 / s, where M is the thickness of the confined aquifer, with the unit of m;

[0076] where r is the distance from the calculation point to the well axis, with the unit of m; S is the storage coefficient, dimensionless; t is the pumping or injection time, with the unit of s;

[0077] W(u) is the well function, which can be obtained by looking up tables or numerical calculations.

[0078] During positive pressure injection, an artificial pressure head is applied to form a positive pressure in the piezometer tube, which is equivalent to increasing the hydraulic gradient, driving acidic solutions, etc. to overcome the soil pore resistance and gravity and seep from the inlet holes to the periphery of the geotextile. By regulating the positive pressure to change the head difference (dh), different soil permeability characteristics are adapted to ensure that the reagent reaches the crystallization site evenly and efficiently; for clear aqueous solutions, the positive pressure allows it to fully dilute the residual solutes, unreacted reagents, and loosened fine crystal particles after crystallization and dissolution, preventing redeposition.

[0079] Similar to the formation of a low pressure in the well during pumping from a recharge well to attract the surrounding water flow, negative pressure water is applied in the piezometer tube to form a pressure environment lower than the surrounding area containing water of crystallization. According to the principle of pressure difference-driven flow, fluids always flow from the high-pressure area to the low-pressure area. At this time, the water containing water of crystallization around the piezometer tube flows into the tube under the action of the pressure difference ΔP. Its flow rate Q is related to factors such as the pressure difference, the characteristics of the piezometer tube and the surrounding medium, and can generally be expressed as where C is a coefficient related to the characteristics of the fluid and the medium, and R is the flow resistance. Through this negative pressure suction, the water dissolved with crystalline substances and the highly concentrated solution that may crystallize again are drawn away from the periphery of the piezometer tube (within the range of r), reducing the concentration of easily crystallizable substances in the local area and reducing the possibility of redeposition and blockage.

[0080] 3. Solute transport principle in porous media - diffusion and convection

[0081] After the acidic aqueous solution and the clear water solution are pressed into the soil pores around the piezometer tube in this porous medium environment, the solutes in the solution (such as hydrogen ions and chloride ions in the acidic reagent, water molecules in the clear water, etc.) will not only migrate as a whole with the water flow, but also diffuse due to molecular thermal motion. Due to the concentration gradient between the calcium carbonate crystal region on the geotextile and the surrounding solution, the solutes will spontaneously diffuse from the high-concentration solution region to the crystal surface, accelerating the chemical reaction and dissolution process. For example, hydrogen ions in the acidic solution continuously diffuse to the calcium carbonate crystal, continuously participating in the dissolution reaction and improving the dissolution efficiency. At the same time, the solution flow driven by positive pressure forms convection, and the convection enables the acidic solutes with dissolving ability and the clear water with dilution effect to quickly cover a wider area of the geotextile, taking away the dissolved products (such as calcium chloride, etc.) and the loosened crystal particles, preventing them from aggregating and precipitating again in place. The combination of this convection and diffusion ensures that the treatment of calcium carbonate crystals is not limited to the vicinity of the injection point, but can play a role in a large range of the geotextile (within the range of r from the tube axis), improving the comprehensiveness and effectiveness of dredging and treatment.

[0082] 4. Principles of Materials Science

[0083] Select a corrosion-resistant plunger high-pressure pump, acid and alkali-resistant PTFE hoses and a liquid storage tank of a specific material. According to the chemical corrosion resistance, compressive resistance, sealing and other properties of the materials, ensure the stable operation of the equipment in the acidic reagent environment, achieve accurate reagent injection and waste liquid suction, and help the smooth implementation of the entire dredging process.

[0084] These principles cooperate with each other to support the entire chemical dredging scheme of the geotextile, ensuring the normal functions of the geotextile and the piezometer tube in the hydraulic engineering.

[0085] Specifically, the chemical clogging dredging method for hydraulic piezometer tubes provided by this application includes:

[0086] Step 1: Prepare chemical reagents. The chemical reagents include an acidic main agent and an auxiliary reagent, and the auxiliary reagent is composed of a buffer solution and an anti-precipitation agent.

[0087] In Step 1, the acidic main agent can be dilute hydrochloric acid with an appropriate concentration to reduce the risk of excessive corrosion of the geotextile fibers, while ensuring sufficient dissolving ability for calcium carbonate crystals. The buffer solution is used to increase the acetic acid content in the buffer water, adjust the pH to 4 - 5, enhance the ability to decompose residual crystals, and quickly neutralize the locally over-acidic environment after the reaction of the acidic main agent. And, the fiber protection is strengthened by adjusting the proportion of the corrosion inhibitor. In addition, a small amount of anti-precipitation agent, such as a small amount of EDTA-2Na (ethylenediaminetetraacetic acid disodium), can be added to neutral clear water, which can chelate the calcium ions and other substances that may remain in the water to prevent the formation of secondary precipitation.

[0088] Step 2: Pretreat the piezometer 9. The pretreatment includes: endoscopic inspection of the crystallization and integrity of the pipe wall and dredging and cleaning of the water inlet hole 10.

[0089] Specifically, use a special soft brush combined with low-pressure water flow flushing to ensure that the water inlet hole is unobstructed, which is conducive to reagent injection. Understand in detail the geological information such as the soil type and density around the piezometer, estimate the reagent penetration resistance, and provide a basis for subsequent pressure regulation.

[0090] Step 3: Connect the plastic liquid storage tank 1 filled with chemical reagents to the piezometer 9 and inject the chemical reagents into the piezometer 9.

[0091] In Step 3, the injection of the chemical reagents into the piezometer 9 includes:

[0092] As Figure 2 shown, use a high-pressure positive pressure pump (such as the plunger high-pressure pump 2) to inject the acidic main agent into the piezometer 9 and maintain the pressure in the pipe within a certain range, so as to promote the full diffusion of the acidic main agent to all corners of the geotextile 11 and fully react with crystals such as CaCO 3 ; Set different reaction times according to the severity of crystallization. Specifically, the pressure in the pipe is maintained within a certain range through the coordinated cooperation of the plunger high-pressure pump 2, the connecting pipe, the plastic liquid storage tank 1 and the valve 3.

[0093] After the acidic main agent reacts for a certain time, switch to inject the auxiliary reagent, and maintain the positive pressure within a certain range to continuously decompose the residual crystals. During this period, monitor the changes in the chemical indicators of the surrounding environment with the help of a soil sensor, and pay attention to the pH value, ensuring that it is stable within the range of 4-5.

[0094] In addition, in Step 3, a pressure gauge 4 installed on the pipeline is used to real-time feedback the pressure change in the pipe to prevent the destruction of the soil structure due to excessive pressure.

[0095] Step 4: After the chemical reagent reaction is completed, switch to the negative pressure suction mode, and use the rotary vane vacuum pump 7 to pump out the waste liquid and residual reagents dissolved with crystals such as CaCO 3 etc.

[0096] Specifically, after the reaction is completed, switch to the negative pressure suction mode. As Figure 3 shown, use a vacuum pump to pump out the waste liquid dissolved with CaCO 3The waste liquid and residual reagents of crystallization are extracted, and the negative pressure is controlled within a certain range to prevent excessive suction from disturbing the soil structure or damaging the geotextile 11 due to excessive suction. During the extraction process, the positive pressure can be intermittently turned on for a short reverse flushing to ensure the complete removal of the waste liquid and avoid the hidden danger of secondary crystallization. The extracted waste liquid is collected uniformly and discharged after reaching the standard through neutralization and precipitation treatment. After the extraction is completed, neutral clear water containing an anti-precipitation agent is injected to dilute the dissolved crystals, and the geotextile and piezometer tube are rinsed to ensure the removal of residual reagents and reaction products and restore the water permeability of the geotextile. Subsequently, the water intake efficiency of the piezometer tube and the state of the geotextile are monitored regularly to evaluate the treatment effect. If there are still slight signs of crystallization, the treatment process can be repeated appropriately.

[0097] It should be noted that the method provided in this embodiment is the method corresponding to the devices provided in Embodiments 1 and 2. Therefore, for the parts that are the same or similar to those in Embodiment 1 in this embodiment, reference can be made to each other and will not be elaborated in this application.

Claims

1. A hydraulic pressure measuring tube chemical blockage dredging device, characterized in that: include: A pressure measuring tube (9), a liquid storage system, a conveying pipeline system, a power system and a control system; the pressure measuring tube (9), the liquid storage system, the power system and the control system are all connected to the conveying pipeline system; The liquid storage system comprises a plurality of independent plastic liquid storage tanks (1); the power system comprises a high-pressure positive pressure pump and a negative pressure suction pump; the high-pressure positive pressure pump is used to inject chemical reagents and clean water into a pressure measuring tube (9), and the negative pressure suction pump is used to pump water; the control system comprises a pressure gauge (4), and the pressure gauge (4) is used to monitor pressure data during positive pressure injection and negative pressure pumping; a water inlet hole (10) is provided at the bottom of the pressure measuring tube (9); and the outer layer of the pressure measuring tube (9) is wrapped with a geotextile (11).

2. The hydraulic pressure measuring tube chemical blockage dredging device according to claim 1 is characterized in that: The high-pressure positive-pressure pump is a plunger-type high-pressure pump (2), and the negative-pressure suction pump is a rotary vane vacuum pump (7).

3. The hydraulic pressure measuring tube chemical blockage dredging device according to claim 2 is characterized in that: Also includes: An auxiliary system, the auxiliary system comprising a buffer bottle (5) and a gas filter (6); the buffer bottle (5) and the gas filter (6) are arranged on a pipeline between a rotary vane vacuum pump (7) and a pressure measuring tube (9).

4. The hydraulic pressure measuring tube chemical blockage dredging device according to claim 3 is characterized in that: The pipeline system is made of PTFE material, and the pipelines are sealed and connected.

5. The hydraulic pressure measuring tube chemical blockage dredging device according to claim 4 is characterized in that: The plastic liquid storage tank (1) is equipped with an anti-sedimentation device, which is a stirrer or an ultrasonic oscillator.

6. The hydraulic pressure measuring tube chemical blockage dredging device according to claim 5, characterized in that: One end of the rotary vane vacuum pump (7) away from the pressure measuring tube (9) is connected to a waste liquid storage tank (8) via a pipeline.

7. A method for clearing chemical blockage of hydraulic pressure measuring pipe, characterized in that: Executed by the device according to any one of claims 1 to 6, comprising: Step 1, preparing chemical reagents, wherein the chemical reagents include an acidic main agent and an auxiliary agent, wherein the auxiliary agent is composed of a buffer solution and an anti-precipitation agent; Step 2, pre-treating the pressure measuring tube (9), the pre-treating comprising: endoscopically inspecting the crystallization and integrity of the tube wall and clearing and cleaning the water inlet hole (10); Step 3, connecting the plastic liquid storage tank (1) containing the chemical reagent to the pressure measuring tube (9), and injecting the chemical reagent into the pressure measuring tube (9); Step 4: After the chemical reagent reaction is completed, switch to negative pressure suction mode and use a rotary vane vacuum pump (7) to extract the waste liquid containing CaCO3 and residual reagents.

8. The method for clearing chemical blockage of hydraulic pressure measuring tube according to claim 7, characterized in that: In step 3, the step of injecting the chemical reagent into the pressure measuring tube (9) comprises: Using a high-pressure positive pressure pump, the acidic main agent is injected into the pressure measuring tube (9), and the pressure in the tube is maintained within a certain range, so that the acidic main agent is fully diffused to every corner of the geotextile (11) and fully reacts with the CaCO3 crystals; After the acidic main agent reacts for a certain period of time, the auxiliary agent is switched to be injected, and the positive pressure is maintained within a certain range to continuously decompose the residual crystals.

9. The method for clearing chemical blockage of hydraulic pressure measuring tube according to claim 8, characterized in that: In step 4, positive pressure is intermittently turned on for brief recoil during the suction process.

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