Slurry circulating system for pipe jacking construction

Abstract

The utility model discloses a pipe-jacking construction slurry circulating system which is characterized in that a cyclone separator comprises a cylindrical section and a conical section which are connected with each other, a feed port in the tangential direction is formed in the middle upper part of the side surface of the cylindrical section, an overflow port is formed in the center of the top of the cylindrical section, and an underflow port is formed in the bottom of the conical section; the filter tank is communicated with the overflow port through a first connecting pipe, a microfiltration membrane assembly is arranged in the filter pipe, the second filter mechanism comprises a mounting rack and at least two ultrafiltration membrane pipes arranged on the mounting rack, and the ultrafiltration membrane pipes are connected with the water production port of the filter tank through a water inlet pipe. According to the pipe-jacking construction slurry circulating system, the cyclone separator, the first filtering mechanism and the second filtering mechanism form a three-stage separation treatment unit for drowning, deep purification of fine particles is achieved, the capacity of capturing the fine particles in muddy water is improved, and it is effectively avoided that a large number of fine particles remain in slurry.

Description

Technical Field

[0001] This utility model relates to the field of pipe jacking construction technology, and in particular to a slurry circulation system for pipe jacking construction. Background Technology

[0002] Pipe jacking technology is a trenchless pipeline laying technology commonly used in municipal construction. It operates deep underground, requires minimal construction space, generates little noise, and has minimal impact on the surrounding environment, giving it a strong competitive advantage in certain situations. During normal operation of the tunneling machine, the inlet and outlet valves are opened, allowing slurry to flow from the slurry pipe into the slurry chamber at the excavation face. The excavated mud and sand are mixed with the slurry and then transported to the surface slurry circulation system via the outlet pipe and pump. A slurry separation device separates the sludge from the mud; the sludge is transported off-site, while the slurry remains in the slurry pool. After sedimentation, the slurry is returned to the slurry chamber, forming a slurry (mud) circulation system.

[0003] However, existing mud treatment systems for pipe jacking installations have revealed poor fine particle separation performance during actual operation. This results in a persistently high solid particle content in the recovered mud, significantly impacting its lubricity and stability. Current mud-water separation devices are mostly designed for separating larger particles, with extremely limited ability to capture fine particles. The large number of fine particles remaining in the mud not only reduces its own lubricity but also significantly increases frictional resistance during pipe jacking, even posing a risk of clogging mud pumps and pipelines. Furthermore, the continuous accumulation of fine particles leads to increased mud viscosity and reduced fluidity, severely negatively impacting construction efficiency and quality. Utility Model Content

[0004] The purpose of this invention is to provide a slurry circulation system for pipe jacking construction to address the aforementioned shortcomings in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A slurry circulation system for pipe jacking construction includes:

[0007] A hydrocyclone separator, comprising a cylindrical section and a conical section connected together, wherein the cylindrical section has a tangential feed inlet on the upper part of its side, an overflow outlet is provided at the center of the top of the cylindrical section, and an underflow outlet is provided at the bottom of the conical section;

[0008] A first filtration mechanism, comprising at least one filter tank, wherein the filter tank is connected to the overflow port via a first connecting pipe, and a microfiltration membrane assembly is disposed inside the filter tank;

[0009] The second filtration mechanism includes a mounting frame and an ultrafiltration membrane tube disposed on the mounting frame. There are at least two ultrafiltration membrane tubes, and the ultrafiltration membrane tubes are connected to the product water port of the filter tank through an inlet pipe.

[0010] The above-mentioned pipe jacking construction mud circulation system includes a first filter tank and a second filter tank connected in sequence. Both the first filter tank and the second filter tank are equipped with microfiltration membrane components. The pore size of the microfiltration membrane component in the first filter tank is larger than the pore size of the microfiltration membrane component in the second filter tank.

[0011] In the aforementioned pipe jacking construction mud circulation system, there are multiple ultrafiltration membrane tubes, which are fixedly installed side by side on the mounting frame.

[0012] In the aforementioned pipe jacking construction mud circulation system, the bottom of the ultrafiltration membrane tube is provided with a water inlet, the mounting frame is provided with a water inlet pipe, the water inlet pipe is connected to each of the water inlets, and the water inlet pipe is provided with a manual water inlet valve and an automatic water inlet valve.

[0013] In the aforementioned pipe jacking construction mud circulation system, the top of the ultrafiltration membrane tube is provided with a water outlet, the mounting frame is provided with a water outlet pipe, the water outlet pipe is connected to each of the water outlets, and the water outlet pipe is provided with a manual water outlet valve, an automatic water outlet valve and a water flow meter.

[0014] The aforementioned slurry circulation system for pipe jacking construction also includes a backwashing mechanism, wherein the filter tank and the ultrafiltration membrane tube are both connected to the backwashing mechanism.

[0015] The aforementioned slurry circulation system for pipe jacking construction includes a backwashing inlet pipe, and each of the ultrafiltration membrane tubes is provided with a backwashing port at its top. The backwashing inlet pipe is connected to each of the backwashing ports.

[0016] In the aforementioned pipe jacking construction mud circulation system, the bottom of the ultrafiltration membrane tube is provided with a drain outlet, and a drain pipe is provided on the drain outlet. The drain pipe is used to discharge concentrated water or backwash water.

[0017] The above-mentioned slurry circulation system for pipe jacking construction includes an air inlet pipe in the second filtration mechanism. The air inlet pipe is connected to each of the ultrafiltration membrane tubes and is equipped with an air inlet valve, a pressure reducing valve, a gas flow meter, and an exhaust valve.

[0018] In the above technical solution, the slurry circulation system for pipe jacking construction provided by this utility model includes a hydrocyclone separator, a first filtration mechanism, and a second filtration mechanism. The hydrocyclone separator includes a cylindrical section and a conical section connected together. The first filtration mechanism includes at least one filter tank, which is connected to the overflow port of the hydrocyclone separator through a first connecting pipe. A microfiltration membrane assembly is installed inside the filter tank. The second filtration mechanism includes a mounting frame and an ultrafiltration membrane tube installed on the mounting frame. The ultrafiltration membrane tube is connected to the water inlet of the filter tank through an inlet pipe. During use, the hydrocyclone separator acts as a primary separation unit, separating coarse solid particles with larger particle sizes in the slurry through centrifugal force. The first filtration mechanism acts as a secondary separation unit, further separating medium-sized particles with smaller particle sizes in the slurry. The second filtration mechanism acts as a tertiary separation unit, achieving deep purification of fine particles, improving the ability to capture fine particles in the slurry, effectively avoiding a large number of fine particles remaining in the slurry, reducing frictional resistance during pipe jacking, and improving the lubrication performance of the slurry itself. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 A schematic diagram of the slurry circulation system for pipe jacking construction provided in this embodiment of the utility model;

[0021] Figure 2 A schematic diagram of the structure of the first filtration mechanism provided in an embodiment of this utility model;

[0022] Figure 3 A schematic diagram of the structure of the mounting bracket provided in an embodiment of this utility model;

[0023] Figure 4 A front view of the second filtering mechanism provided in an embodiment of this utility model;

[0024] Figure 5 Left view of the second filtering mechanism provided in an embodiment of this utility model;

[0025] Figure 6 A top view of the second filtering mechanism provided in an embodiment of this utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Hydrocyclone separator; 11. Cylindrical section; 12. Conical section; 13. Feed inlet; 14. Overflow outlet; 15. Underflow outlet; 2. First filtration mechanism; 21. First filter tank; 22. Second filter tank; 23. First connecting pipe; 3. Second filtration mechanism; 31. Mounting bracket; 32. Ultrafiltration membrane tube; 33. Water inlet pipe; 331. Manual water inlet valve; 332. Automatic water inlet valve; 34. Water outlet pipe; 341. Manual water outlet valve; 342. Automatic water outlet valve; 343. Water flow meter; 35. Backwash water inlet pipe; 36. Drain pipe; 37. Air inlet pipe; 371. Air inlet valve; 372. Pressure reducing valve; 373. Gas flow meter; 374. Exhaust valve. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0029] like Figure 1-6 As shown, this utility model provides a slurry circulation system for pipe jacking construction, including a hydrocyclone separator 1, a first filtration mechanism 2, and a second filtration mechanism 3. The hydrocyclone separator 1 includes a cylindrical section 11 and a conical section 12 connected to each other. The upper middle part of the side of the cylindrical section 11 is provided with a tangential feed port 13, and the center of the top of the cylindrical section 11 is provided with an overflow port 14. The bottom of the conical section 12 is provided with a bottom flow port 15. The first filtration mechanism 2 includes at least one filter tank, which is connected to the overflow port 14 through a first connecting pipe 23. A microfiltration membrane assembly is provided inside the filter tank. The second filtration mechanism 3 includes a mounting frame 31 and an ultrafiltration membrane tube 32 disposed on the mounting frame 31. There are at least two ultrafiltration membrane tubes 32, which are connected to the water outlet of the filter tank through a water inlet pipe 33.

[0030] Specifically, the slurry circulation system for pipe jacking construction consists of a hydrocyclone separator 1, a first filter mechanism 2, and a second filter mechanism 3. The hydrocyclone separator 1 serves as the primary separation unit, using centrifugal force to separate larger coarse particles from the slurry. The first filter mechanism 2 serves as the secondary separation unit, further separating smaller medium-sized particles from the slurry. The second filter mechanism 3 serves as the tertiary separation unit, achieving deep purification of fine particles. In this process, the slurry to be processed is sequentially transported to the hydrocyclone separator 1, the first filter mechanism 2, and the second filter mechanism 3, thus undergoing three separation and filtration processes. This ensures that fine particles in the slurry are separated, and the filtered slurry can be returned to the slurry tank for recycling.

[0031] In this embodiment, the hydrocyclone 1 includes an integrally formed cylindrical section 11 and a conical section 12. A tangential feed inlet 13 is provided on the upper part of the side of the cylindrical section 11, while an overflow outlet 14 is provided at the center of the top. An underflow outlet 15 is provided at the bottom of the conical section 12. When the slurry enters the cylindrical section 11 from the tangential feed inlet 13 at a certain speed, the slurry, constrained by the inner wall of the cylindrical section 11, begins to move in a circular motion around the central axis of the cylindrical section 11 along the inner wall. The mud and water enter the hydrocyclone 1 and can maintain circular motion inside the hydrocyclone 1. The particles in it begin to separate under the action of centrifugal force. By setting the conical section, the radius of rotation of the slurry is reduced, the rotation speed is increased, the centrifugal force is increased, and the separation effect is improved. During the process of conveying mud and water inside the rotary separator, coarse particles will move towards the wall of the separator, then slide down along the conical section 12 and finally be discharged from the bottom outlet 15, while fine particles will rise with the internal swirling flow and be discharged through the overflow outlet 14. This is the working principle of the existing cyclone separator 1, which will not be elaborated further.

[0032] In this embodiment, the first filtration mechanism 2 includes a filter tank and a microfiltration membrane assembly disposed inside the filter tank. The microfiltration membrane assembly is used to intercept particles in the slurry with a particle size within a certain range. The filter tank integrates at least one layer of microfiltration membrane assembly, which has uniformly distributed pore sizes and can effectively intercept particles of a specific size. This is prior art and will not be described in detail. The first filtration mechanism 2 may further include a first filter tank 21 and a second filter tank 22 connected in sequence. Both the first filter tank 21 and the second filter tank 22 are equipped with microfiltration membrane components. The pore size of the microfiltration membrane component in the first filter tank 21 is larger than that in the second filter tank 22. Thus, during operation, the slurry after hydrocyclone separation enters the first filter tank 21. Driven by pressure, the slurry passes through the microfiltration membrane component at a certain flow rate. The clean water in the slurry can pass through the uniformly distributed pores on the membrane, while particles with a diameter larger than the membrane pore size are intercepted. Some of the intercepted particles are directly blocked by the membrane surface. The slurry after separation and treatment by the first filter tank 21 is transported to the second filter tank 22 for further treatment. The second filter tank 22 further treats the mud and water, and finally outputs it from the product water outlet.

[0033] In this embodiment, the second filtration mechanism 3 is equipped with an ultrafiltration membrane module, which enables deep purification of smaller particles and dissolved organic matter in the slurry. When the slurry circulation system for pipe jacking construction is in operation, the slurry treated by the first filtration mechanism 2 enters the second filtration mechanism 3 under the pressure provided by the pump. Colloidal particles with a diameter larger than the membrane pore size are retained by the ultrafiltration membrane module, while dissolved organic matter is selectively adsorbed when passing through the membrane channels.

[0034] The slurry circulation system for pipe jacking construction provided by this utility model includes a hydrocyclone separator 1, a first filtration mechanism 2, and a second filtration mechanism 3. The hydrocyclone separator 1 includes a cylindrical section 11 and a conical section 12 connected together. The first filtration mechanism 2 includes at least one filter tank, which is connected to the overflow port 14 of the hydrocyclone separator 1 through a first connecting pipe 23. A microfiltration membrane assembly is installed inside the filter tank. The second filtration mechanism 3 includes a mounting frame 31 and an ultrafiltration membrane tube 32 installed on the mounting frame 31. The ultrafiltration membrane tube 32 is connected to the water inlet of the filter tank through a water inlet pipe 33. During use, the hydrocyclone separator 1 acts as a primary separation unit, separating coarse solid particles with larger particle sizes from the slurry through centrifugal force. The first filtration mechanism 2 acts as a secondary separation unit, further separating medium-sized particles with smaller particle sizes from the slurry. The second filtration mechanism 3 acts as a tertiary separation unit, achieving deep purification of fine particles, improving the ability to capture fine particles in the slurry, effectively avoiding a large number of fine particles remaining in the slurry, reducing frictional resistance during pipe jacking, and improving the lubrication performance of the slurry itself.

[0035] In this embodiment, preferably, the second filtration mechanism 3 consists of a mounting frame 31 and multiple ultrafiltration membrane tubes 32 fixed thereon. The mounting frame 31 is made of high-strength aluminum alloy with an anti-corrosion surface treatment, and can stably support multiple sets of cylindrical ultrafiltration membrane tubes 32. The multiple ultrafiltration membrane tubes 32 are arranged vertically, and their bottom and top are connected to the pipeline system through flanges to ensure that the slurry forms a stable flow path inside the tubes.

[0036] In this embodiment, preferably, the bottom of the ultrafiltration membrane tube 32 is provided with an inlet, and the inlet pipe 33 arranged longitudinally at the bottom of the mounting bracket 31 is connected to each inlet through a T-joint. A manual inlet valve 331 and an automatic inlet valve 332 are sequentially installed on the inlet pipe 33. The manual inlet valve 331 is used for manual flow adjustment and serves as an emergency control measure, maintaining basic operation even in the event of an automatic system failure. The automatic inlet valve 332 can automatically open and close according to the system pressure signal, achieving precise control of the slurry inflow. The automatic inlet valve is linked to a pressure sensor through a PLC system to dynamically adjust its opening to maintain a constant transmembrane pressure difference. When the system is operating normally, the slurry treated by the hydrocyclone separator 1 and the first filtration mechanism 2 is evenly distributed to each ultrafiltration membrane tube 32 through the inlet pipe 33. This parallel pipeline design ensures a balanced inflow rate for each membrane tube, avoiding local membrane overload due to flow deviation.

[0037] In this embodiment, preferably, an outlet is provided at the top of the ultrafiltration membrane tube 32, and the outlet pipe 34 arranged horizontally at the top of the mounting bracket 31 is connected to each outlet via elbows. A manual outlet valve 341, an automatic outlet valve 342, and an outlet flow meter 343 are sequentially installed on the outlet pipe 34. The automatic valve, in conjunction with the flow meter, monitors the water production in real time and adjusts the inlet flow rate accordingly. The treated clean water is collected through the outlet pipe 34 and enters subsequent stages to achieve mud-water separation. The real-time data from the outlet flow meter 343 provides key operating parameters for the system. When the water production decreases, the automatic valve can activate the backwashing mechanism to start the cleaning process.

[0038] In this embodiment, preferably, a backwashing mechanism is also included. Both the filter tank and the ultrafiltration membrane tube 32 are connected to the backwashing mechanism, which allows for backwashing of the filter tank and the ultrafiltration membrane tube 32. Taking the backwashing of the ultrafiltration membrane tube 32 as an example: the backwashing mechanism includes a backwash inlet pipe 35, and each ultrafiltration membrane tube 32 has a backwash port at its top. The backwash inlet pipe 35 is connected to each backwash port. The backwash inlet pipe 35 is connected to the backwash port at the top of each ultrafiltration membrane tube 32 via independent branch pipes. When the membrane module needs cleaning, clean water or chemical agents can be injected into the backwash inlet pipe 35 to backwash contaminants on the membrane surface. Simultaneously, the drain outlet at the bottom of the ultrafiltration membrane tube 32 is connected to a concentrated water collection tank via a drain pipe 36. An electromagnetic valve on the drain pipe 36 can switch the discharge mode: concentrated slurry is discharged during normal filtration, and contaminated wastewater is discharged during backwashing. The backwashing system employs a counter-flow design, utilizing the impact force of water flow to remove blockages within the membrane pores, while the injection of chemical agents specifically decomposes organic contaminants.

[0039] In this embodiment, preferably, the air intake system is connected to the interior of each ultrafiltration membrane tube 32 via an air intake pipe 37. An air intake valve 371, a pressure reducing valve 372, a gas flow meter 373, and an exhaust valve 374 are sequentially installed on the pipe. Compressed air enters the membrane tube after pressure reduction, and the airflow disturbance assists in cleaning the membrane surface. The gas flow meter 373 monitors the air washing intensity, and the exhaust valve 374 is used to remove air from the pipeline before system startup to ensure the air washing effect. Combined air-water backwashing can effectively delay membrane fouling and extend the service life of the membrane module. The introduction of compressed air forms a gas-liquid two-phase flow, which further loosens the contaminants attached to the membrane surface through the bubble bursting effect, improving the cleaning efficiency by more than 30% compared to simple water backwashing. The pressure reducing valve 372 ensures that the air pressure entering the membrane tube is stable within a safe range, avoiding physical damage to the membrane fibers caused by high-pressure airflow.

[0040] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A pipe jacking mud circulating system, characterized in that, The utility model provides a kind of water treatment system, comprising: A cyclone separator, the cyclone separator includes connected cylindrical section and conical section, the cylindrical section side upper portion is equipped with tangent direction feed inlet, the cylindrical section top center position is provided with overflow port, the bottom of the conical section is equipped with underflow port; A first filtering mechanism, the first filtering mechanism includes at least one filter tank, the filter tank is connected with the overflow port by first connecting pipe, the filter tank is provided with microfiltration membrane assembly; A second filtering mechanism, the second filtering mechanism includes mounting frame and ultrafiltration membrane tube provided on the mounting frame, the ultrafiltration membrane tube has at least two, the ultrafiltration membrane tube is connected with the water production port of the filter tank by water inlet pipe.

2. The pipe jacking mud circulating system according to claim 1, wherein, The first filtering mechanism includes first filter tank and second filter tank connected in turn, the first filter tank and the second filter tank are provided with microfiltration membrane assembly, the pore size of the microfiltration membrane assembly in the first filter tank is greater than the pore size of the microfiltration membrane assembly in the second filter tank.

3. The pipe jacking mud circulating system according to claim 1, characterized in that, The ultrafiltration membrane tube has multiple, multiple ultrafiltration membrane tubes are fixedly installed side by side on the mounting frame.

4. The pipe jacking mud circulating system according to claim 3, characterized in that, The bottom of the ultrafiltration membrane tube is provided with water inlet, the mounting frame is provided with water inlet pipe, the water inlet pipe is connected with each water inlet, the water inlet pipe is provided with manual water inlet valve and automatic water inlet valve.

5. The pipe jacking mud circulating system according to claim 3, characterized in that, The top of the ultrafiltration membrane tube is provided with water outlet, the mounting frame is provided with water outlet pipe, the water outlet pipe is connected with each water outlet, the water outlet pipe is provided with manual water outlet valve, automatic water outlet valve and water outlet flowmeter.

6. The pipe jacking mud circulating system according to claim 1, wherein, It also includes backwashing mechanism, the filter tank and the ultrafiltration membrane tube are connected with the backwashing mechanism.

7. The pipe jacking mud circulating system according to claim 6, characterized in that, The backwashing mechanism includes backwashing water inlet pipe, the top of each ultrafiltration membrane tube is provided with backwashing port, the backwashing water inlet pipe is connected with each backwashing port.

8. The pipe jacking mud circulating system according to claim 1, characterized in that, The bottom of the ultrafiltration membrane tube is provided with drain port, the drain port is provided with drain pipe, and the drain pipe is used to drain concentrated water or backwashing water.

9. The pipe jacking mud circulating system according to claim 1, characterized in that, The second filtering mechanism also includes air inlet pipe, the air inlet pipe is connected with each ultrafiltration membrane tube, the air inlet pipe is provided with air inlet valve, pressure reducing valve, gas flowmeter and exhaust valve.

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