Shield tunneling machine foam system with foaming liquid mixing device and foaming liquid mixing method

Abstract

A shield tunneling machine foam system with a foaming liquid mixing device comprises the foaming liquid mixing device which is provided with a foaming powder bin, a spiral conveying pipe, a foaming liquid mixing tank, a concentration sensor, a water inlet pipeline and a foaming liquid mixing motor, and the concentration sensor and the water inlet pipeline are connected with the foaming liquid mixing tank; the foaming liquid conveying pipeline is connected with the foaming liquid output pipeline; one end of the power gas pipeline is connected with compressed air, and the other end is connected with the front end of the foam generator; the foaming liquid enters a cutter head cutting area through the cutter head rotating joint; and the AI control system is used for adjusting and controlling the concentration and flow of the foaming liquid. The shield tunneling machine can conduct tunneling in cohesive soil layers with various sections, it is guaranteed that mud cakes are not formed on a cutter head, pipelines are not prone to being blocked, muck improvement is effectively conducted, the AI control system can save cost, improve operation safety, reduce energy consumption of the shield tunneling machine and cutter consumption and improve the tunneling speed and efficiency, meanwhile, the foam system can save water and gas resources, and the production cost is reduced. And clean production is realized.

Description

Technical Field

[0001] The invention relates to the technical field of shield machine construction, and in particular to a shield machine foam system with a foaming liquid mixing device and a foaming liquid mixing method. Background Art

[0002] Shield, also known as full-face tunnel boring machine, is a type of tunnel boring machine. At present, shield has been widely used in subway tunnels, public tunnels, railway and highway tunnel construction. During the shield construction process, the soil changes constantly and it is difficult to achieve the expected goal. When the geological conditions are not suitable for tunneling, foaming agent must be injected into the excavation surface and pressure chamber to improve the performance of the soil, ensure the fluidity of the soil, reduce the permeability of the soil, and keep the excavation surface stable.

[0003] The role of the foam system is to effectively control the damage of the stratum to the shield machine during shield excavation. In addition to the selection of shield machines and equipment improvements, the improvement of soil in complex strata is the most important technical measure to control stratum damage, among which foam soil improvement is particularly important.

[0004] In addition, the foam system can also make the slag have better water-stopping properties to control groundwater loss; make the cut slag quickly enter the soil compartment and facilitate the smooth discharge of the screw conveyor; effectively prevent the soil slag from sticking to the cutter disc and producing mud cakes; prevent or reduce the gushing phenomenon when the screw conveyor discharges soil; effectively reduce the torque of the cutter disc and reduce the wear of the cutter disc, tool and screw conveyor. The principle of the foam system is to mix the foaming agent (liquid) with the mixture of water and compressed air, and generate 30-400μm fine emulsion foam through the foam generating station, which is injected into the excavation face and soil compartment to ensure the smooth discharge of the slag and keep the excavation face stable. In particular, the practice of using foaming agents to improve soil has been widely used in tunnel excavation projects in the past decade, and its application scope and scale are getting larger and larger.

[0005] However, when shield tunneling in rock-soil composite strata, it is common to encounter problems such as poor soil improvement, frequent blockage of foam pipes, and the need to shut down for maintenance. It is very easy for the cutter head foam outlet to be blocked, or for the cutter head to form mud cakes, or for the soil to become a slurry and "spout" at the screw machine outlet. Therefore, the existing shield machine foam system with a foaming liquid mixing device and the foaming liquid mixing method urgently need to be improved in the following aspects: (1) Foaming liquid transportation: The commonly used method at present is to purchase the prepared foaming liquid (in barrels) and transport it into the tunnel to supply the foam system for direct use. The transportation cost is high and there is a risk of waiting for material to be shut down. (2) Water and stock liquid mixing method: The commonly used method at present is to purchase pre-prepared foaming liquid (in barrels), which has a stable concentration but is not easy to adjust. (3) Injection foaming agent concentration and flow control: The commonly used method at present is for the operator to manually control the human-machine interface according to the instructions from the shield machine main control room during excavation construction, which is unstable and delayed.

[0006] Therefore, in view of the problems existing in the prior art, the designers of this case, relying on their many years of experience in this industry, actively researched and improved, and thus came up with the present invention, a shield machine foam system with a foaming liquid mixing device and a foaming liquid mixing method. Summary of the invention

[0007] The first purpose of the present invention is to provide a shield machine foam system with a foaming liquid mixing device in view of the defects in the prior art, in which shield machines are excavated in rock-soil composite strata, such as poor soil improvement, frequent blockage of foam pipes, and the need to shut down for maintenance, blockage of the cutter head foam outlet, mud cake formation on the cutter head, or slurry formation and "gushing" at the screw machine outlet.

[0008] The second purpose of the present invention is to provide a foaming liquid mixing method for a shield machine foam system with a foaming liquid mixing device in view of the defects in the prior art, such as poor slag improvement, frequent blockage of foam pipes, and the need to shut down for maintenance, which easily lead to blockage of the cutter head foam outlet, or formation of mud cakes on the cutter head, or the slag becoming a slurry and "gushing" at the screw machine outlet.

[0009] To achieve the first object of the present invention, the present invention provides a shield machine foam system with a foaming liquid mixing device, the shield machine foam system with the foaming liquid mixing device comprising:

[0010] A foaming liquid mixing device, the foaming liquid mixing device is fixedly arranged on the mounting base, and further comprises a foaming powder bin with a feeding port, a spiral transmission pipe for transmitting the foaming agent powder in the foaming powder bin through a transmission pipe motor, a foaming liquid mixing tank for receiving the foaming agent powder transmitted by the spiral transmission pipe, a concentration sensor electrically connected to the foaming liquid mixing tank and a water inlet pipe mechanically connected thereto, and a foaming liquid output pipe for outputting the foaming liquid under the action of a delivery pump after the foaming agent is stirred in the foaming liquid mixing tank to a preset concentration by the foaming liquid mixing motor;

[0011] A foaming liquid transmission pipeline, wherein the foaming liquid transmission pipeline is connected to the foaming liquid output pipeline of the foaming liquid mixing device in multiple ways;

[0012] A power gas pipeline, one end of which is connected to the compressed air for the shield machine, and the other end of which is connected in multiple ways to the front end of the foam generator of the foaming liquid transmission pipeline;

[0013] The cutter disc rotary joint, the foaming liquid transmission pipeline is injected with compressed air, and the foaming liquid enters the cutter disc cutting area through the cutter disc rotary joint after being metered, flow direction, and pressure digitally measured;

[0014] An AI control system receives real-time concentration data, foaming liquid mixing motor speed, delivery pump speed, foaming agent powder remainder, foaming liquid remainder, as well as cutter head torque, shield thrust, cutter head speed, excavation speed, foam flow, foam concentration, motor speed, foam pressure, screw machine mud discharge speed, air pressure, and water pressure collected by a concentration sensor of a foaming liquid mixing device using a near-field data transmission method, and then adjusts and controls the concentration and flow of the foaming liquid.

[0015] Optionally, the foaming liquid transmission pipeline is further provided with an electronically controlled solution metering regulating valve, a liquid flow meter, a pressure gauge, a foam generator, a transparent observation tube, and a pressure sensor.

[0016] Optionally, a pressure gauge and a pressure reducing valve assembly are further arranged between the power gas pipeline and the compressed air for the shield machine.

[0017] Optionally, a gas flow meter, an electrically controlled air dosage regulating valve, and a pressure gauge are further arranged between the power gas pipeline and the foaming liquid transmission pipeline.

[0018] Optionally, the near-field data transmission is at least one of network, TCP / IP, Bluetooth, 5G, and Internet of Things.

[0019] To achieve another object of the present invention, the present invention provides a foaming liquid mixing method for a shield machine foam system having a foaming liquid mixing device, the foaming liquid mixing method comprising:

[0020] Execute step S1: inject the foaming agent powder into the foaming powder bin through the feeding port;

[0021] Execute step S2: convey the foaming agent powder in the foaming powder bin to the foaming liquid mixing tank through the conveying pipe motor using the spiral conveying pipe;

[0022] Executing step S3: stirring the foaming agent powder and the water source from the water inlet pipe in the foaming liquid mixing tank to a preset concentration by means of a foaming liquid mixing motor;

[0023] Execute step S4: under the action of the delivery pump, the foaming liquid is output to the foaming liquid transmission pipeline through the foaming liquid output pipeline, and further enters the cutter disc cutting area through the cutter disc rotary joint;

[0024] Execute step S5: the AI ​​control system adjusts and controls the concentration and flow rate of the foaming liquid according to the monitoring data.

[0025] To sum up, the shield machine foam system with a foaming liquid mixing device of the present invention can not only meet the shield machine's excavation in various sections of clay soil layers, ensure that the cutter head does not form mud cakes, the pipeline is not easily blocked, and effectively inject foam to improve the slag, but the foam system is controlled by an AI control system based on a big data architecture, which saves a lot of labor costs and logistics transportation costs, improves operation safety, improves intelligent control optimization and reduces shield machine energy consumption and tool consumption, and improves excavation speed and operation efficiency. At the same time, the shield machine foam system adopts mixing control to prepare the solution and injection control to adjust the compressed air, which can save a lot of water, gas and other resources and realize clean production. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The figure shows the principle diagram of the foam system of the shield machine with the foaming liquid mixing device of the present invention;

[0027] Figure 2 Shown is a schematic structural diagram of the foaming liquid mixing device of the present invention;

[0028] Figure 3 The figure shows the AI ​​control system based on the big data architecture of the present invention;

[0029] Figure 4 Shown is a flow chart of the foaming liquid mixing method of the present invention. DETAILED DESCRIPTION

[0030] In order to explain the technical content, structural features, objectives and effects of the present invention in detail, the following will be described in detail with reference to embodiments and accompanying drawings.

[0031] See also Figure 1 to Figure 3 , Figure 1 Shown is a schematic diagram of a shield machine foam system having a foaming liquid mixing device according to the present invention. Figure 2 Shown is a schematic structural diagram of the foaming liquid mixing device of the present invention. Figure 3 The AI ​​control system based on the big data architecture of the present invention is shown. The shield machine foam system with the foaming liquid mixing device comprises:

[0032] A foaming liquid mixing device 1, the foaming liquid mixing device 1 is fixedly arranged on a mounting base 10, and further comprises a foaming powder bin 11 having a feeding port 111, a spiral transmission pipe 13 for transmitting foaming agent powder in the foaming powder bin 11 through a transmission pipe motor 12, a foaming liquid mixing tank 14 for receiving the foaming agent powder transmitted by the spiral transmission pipe 13, a concentration sensor 15 electrically connected to the foaming liquid mixing tank 14 and a water inlet pipe 16 mechanically connected thereto, and a foaming liquid output pipe 19 for outputting foaming liquid under the action of a delivery pump 18 after the foaming agent is stirred to a preset concentration in the foaming liquid mixing tank 14 through a foaming liquid mixing motor 17;

[0033] A foaming liquid transmission pipeline 2, wherein the foaming liquid transmission pipeline 2 is connected to the foaming liquid output pipeline 19 of the foaming liquid mixing device 1 in multiple ways, and an electronically controlled solution metering regulating valve 21, a liquid flow meter 22, a pressure gauge 23, a foam generator 24, a transparent observation tube 25, and a pressure sensor 26 are further arranged on the foaming liquid transmission pipeline 2;

[0034] A power gas pipeline 3, one end of which is connected to the shield machine compressed air 4, and the other end is connected to the front end of the foam generator 24 of the foaming liquid transmission pipeline 2 in multiple ways, a pressure gauge 31 and a pressure reducing valve assembly 32 are further arranged between the power gas pipeline 3 and the shield machine compressed air 4, and a gas flow meter 33, an electrically controlled air dosage regulating valve 34, and a pressure gauge 31 are further arranged between the power gas pipeline 3 and the foaming liquid transmission pipeline 2;

[0035] The cutter disc rotary joint 5, the foaming liquid transmission pipeline 2 is injected with compressed air, and the foaming liquid enters the cutter disc cutting area through the cutter disc rotary joint 5 after being measured, flow direction, and pressure digitally measured;

[0036] The AI ​​control system 6 receives the real-time concentration data, the speed of the foaming liquid mixing motor, the speed of the delivery pump, the remaining foaming agent powder, the remaining foaming liquid, as well as the cutter head torque, the shield thrust, the cutter head speed, the excavation speed, the foam flow, the foam concentration, the motor speed, the foam pressure, the screw machine mud discharge speed, the air pressure, and the water pressure collected by the concentration sensor 15 of the foaming liquid mixing device 1 using the near-field data transmission method, and then adjusts and controls the concentration and flow of the foaming liquid.

[0037] See also Figure 4 , Figure 4 The flow chart of the foaming liquid mixing method of the present invention is shown. The foaming liquid mixing method comprises:

[0038] Execute step S1: inject the foaming agent powder into the foaming powder bin 11 through the feeding port 111;

[0039] Execute step S2: convey the foaming agent powder in the foaming powder bin 11 to the foaming liquid mixing tank 14 through the conveying pipe motor 12 using the spiral conveying pipe 13;

[0040] Execute step S3: stir the foaming agent powder and the water source from the water inlet pipe 16 in the foaming liquid mixing tank 14 to a preset concentration through the foaming liquid mixing motor 17;

[0041] Execute step S4: under the action of the delivery pump 18, the foaming liquid is output to the foaming liquid transmission pipeline 2 through the foaming liquid output pipeline 19, and further enters the cutter disc cutting area through the cutter disc rotary joint 5;

[0042] Execute step S5: the AI ​​control system 6 adjusts and controls the concentration and flow rate of the foaming liquid according to the monitoring data.

[0043] As a specific implementation, near-field data transmission includes but is not limited to network, TCP / IP, Bluetooth, 5G, and the Internet of Things.

[0044] As a person skilled in the art, it is easy to understand that the shield machine foam system (AI control system) with a foaming liquid mixing device of the present invention integrates the digital information of the whole system through the intelligent production information management system, forms data collection, data deployment (localization or cloud), data training (artificial intelligence algorithm), and successfully realizes data guidance and operation of the shield machine foam system. The intelligent production information management system is used to integrate the digital function modules contained in the third-party system or the system, and realizes the online application of data through a unified data management method.

[0045] Under the data intelligence framework, the shield machine's intranet has the basic conditions for data cloud storage and data cloud archiving. The control platform can achieve regular model updates by training models with historical data. Real-time calculation data is deployed through cloud databases or on-site to achieve reverse optimization control of the shield machine. In view of the drawback of insufficient system adaptability, this technology can be implemented and deployed in a standardized manner, and unmanned control of artificial intelligence can be gradually realized during the operation of the shield machine.

[0046] The AI ​​control system based on big data architecture of the present invention relies on advanced technologies such as big data, time series database, AI, neural network, etc., and provides an open big data platform architecture for data docking, integration, processing, analysis, storage and application. Through rapid deployment, the shield machine foam system can realize intelligent automatic control during the excavation process, thereby achieving the expected control effect.

[0047] By automatically controlling the key parameters in the shield machine foam system and real-time online monitoring of the excavation data, the stability of the shield machine foam system and the timeliness of the control are improved. Obviously, the shield machine foam system with a foaming liquid mixing device of the present invention reveals the following outstanding substantive features:

[0048] 1. Artificial intelligence self-learning technology

[0049] The shield machine foam system adopts a multi-layer nested intelligent control model to achieve a holographic simulation of manual operation behavior, rather than simply using artificial intelligence technology to simply analyze the numerical relationship of input and output related parameters. In the actual shield tunneling process, working conditions may change at any time, and the complex causal and coupling relationships between variables may also change, resulting in the drift of the optimal operating point and the change of the operating mode. The ideal results cannot be obtained based on the model and optimization output results under normal working conditions.

[0050] The shield machine foam system adopts artificial intelligence self-learning algorithm technology. According to the safety range determined by historical data, based on the system status in historical data and the dynamic data of manual operation by the operator, the self-learning algorithm Agent will automatically explore and try different operation methods and modes, and find the best operation direction and amplitude based on historical data. A reinforcement learning mechanism is used to track and evaluate the working conditions after the trial operation in real time, and the evaluation information is fed back to the control unit, which automatically determines the operation mode of the next stage according to the effect after the trial. This process realizes a cycle of artificial automatic trial and automatic learning, and the system output responds to dynamic changes close to the human operation habits. At the same time, the AI ​​algorithm engine can always adapt to the recent complex working condition changes and output the most appropriate operation.

[0051] 2. Deep Neural Network Technology

[0052] The self-learning algorithm adopted by the shield machine foam system uses a time-series deep neural network for global optimization in the model description when there are complex strong dynamic, strong causal, and strong coupling relationships between the variables involved in the calculation, and at the same time have serious nonlinear and time-varying characteristics. Generally, in the process of optimizing the control system's exploration action, there are obvious non-convex characteristics, and there are a large number of local extreme values ​​in the optimization space. In order to improve the efficiency of exploration attempts and find the best search point, this system adopts an intelligent optimization algorithm to avoid the constraints of the exploration action being limited to the local space.

[0053] 3. Heterogeneous data cleaning technology

[0054] Optimize the data collection network of the shield tunneling process, build a big data warehouse with the help of time series database and streaming data DataHub standard interface, realize the effective integration of heterogeneous data of the entire production and operation process such as production, energy, efficiency, equipment, operation and maintenance, material preparation, cost and procurement, and establish an industrial Internet digital platform.

[0055] The shield machine foam system of the present invention adopts a real-time data processing mechanism, and applies the data after processing it with data warehouse technology (Extract Transform Load, ETL), and the data processing efficiency reaches milliseconds or seconds. Some data in shield tunneling control may be invalid, which will seriously affect the accuracy and stability of intelligent control and cause immeasurable losses to production control. Therefore, in the intelligent control of process industry, it is necessary to clean up the "dirty data" or shape the "unformed" data so that the results can be accurately fed back to the control of production equipment.

[0056] The shield machine foam system of the present invention is a process industry intelligent control platform based on big data architecture and AI technology, which adopts advanced data mining technology and artificial intelligence algorithm engine, integrates multi-source heterogeneous data processing, AI algorithm and process shield machine foam system, effectively utilizes the massive data information of production equipment, automatically learns production operation methods from historical data and continuously optimizes them.

[0057] In summary, the shield machine foam system with a foaming liquid mixing device of the present invention has the following significant improvements: (1) The shield machine foam system meets the requirements of the shield machine for excavating in clay layers of various sections, the cutterhead does not form mud cakes, the pipeline is not easily blocked, and foam is effectively injected to improve the slag; (2) The foam is injected into multiple pipelines for foaming and then injected into the soil bin, and the flow rate of each pipeline can be intelligently adjusted; (3) The foam system is controlled by a big data architecture and an AI technology intelligent control system, which can save a lot of labor costs and logistics transportation costs, improve operation safety, and improve intelligent control optimization and reduction. It reduces the energy consumption of shield machines and tool consumption, and improves the excavation speed and work efficiency; (4) The foam system is divided into mixing control and injection control. The mixing control is that under the intelligent control system, the variable frequency screw pump accurately outputs water and raw liquid, and mixes them in proportion in the pipeline to prepare a solution; the injection control is that the solution is adjusted by the intelligent control flow valve through multiple pipelines and then mixed with compressed air adjusted according to the preset proportion of the intelligent control, and then foamed and injected into the soil bin through the foamer; the air is accurately controlled by the flow valve through the intelligent control according to the proportion of the output flow, which can save a lot of water, gas and other resources and realize clean production.

[0058] Those skilled in the art will appreciate that various modifications and variations may be made to the present invention without departing from the spirit or scope of the present invention. Therefore, if any modification or variation falls within the scope of protection of the appended claims and equivalents, it is considered that the present invention covers these modifications and variations.

Claims

1. A shield machine foam system with a foaming liquid mixing device, characterized in that: The shield machine foam system with the foaming liquid mixing device comprises: A foaming liquid mixing device, the foaming liquid mixing device is fixedly arranged on the mounting base, and further comprises a foaming powder bin with a feeding port, a spiral transmission pipe for transmitting the foaming agent powder in the foaming powder bin through a transmission pipe motor, a foaming liquid mixing tank for receiving the foaming agent powder transmitted by the spiral transmission pipe, a concentration sensor electrically connected to the foaming liquid mixing tank and a water inlet pipe mechanically connected thereto, and a foaming liquid output pipe for outputting the foaming liquid under the action of a delivery pump after the foaming agent is stirred in the foaming liquid mixing tank to a preset concentration by the foaming liquid mixing motor; A foaming liquid transmission pipeline, wherein the foaming liquid transmission pipeline is connected to the foaming liquid output pipeline of the foaming liquid mixing device in multiple ways; A power gas pipeline, one end of which is connected to the compressed air for the shield machine, and the other end of which is connected in multiple ways to the front end of the foam generator of the foaming liquid transmission pipeline; The cutter disc rotary joint, the foaming liquid transmission pipeline is injected with compressed air, and the foaming liquid enters the cutter disc cutting area through the cutter disc rotary joint after being metered, flow direction, and pressure digitally measured; An AI control system receives real-time concentration data, foaming liquid mixing motor speed, delivery pump speed, foaming agent powder remainder, foaming liquid remainder, as well as cutter head torque, shield thrust, cutter head speed, excavation speed, foam flow, foam concentration, motor speed, foam pressure, screw machine mud discharge speed, air pressure, and water pressure collected by a concentration sensor of a foaming liquid mixing device using a near-field data transmission method, and then adjusts and controls the concentration and flow of the foaming liquid.

2. The shield machine foam system with a foaming liquid mixing device as claimed in claim 1, characterized in that: The foaming liquid transmission pipeline is further provided with an electronically controlled solution metering regulating valve, a liquid flow meter, a pressure gauge, a foam generator, a transparent observation tube, and a pressure sensor.

3. The shield machine foam system with a foaming liquid mixing device as claimed in claim 1, characterized in that: A pressure gauge and a pressure reducing valve assembly are further arranged between the power gas pipeline and the compressed air for the shield machine.

4. The shield machine foam system with a foaming liquid mixing device as claimed in claim 1, characterized in that: A gas flow meter, an electrically controlled air dosage regulating valve, and a barometer are further arranged between the power gas pipeline and the foaming liquid transmission pipeline.

5. The shield machine foam system with a foaming liquid mixing device as claimed in claim 1, characterized in that: Near field data transmission is at least one of network, TCP / IP, Bluetooth, 5G, and Internet of Things.

6. The foaming liquid mixing method of the shield machine foam system with the foaming liquid mixing device as claimed in claim 1, characterized in that: The foaming liquid mixing method comprises: Execute step S1: inject the foaming agent powder into the foaming powder bin through the feeding port; Execute step S2: convey the foaming agent powder in the foaming powder bin to the foaming liquid mixing tank through the conveying pipe motor using the spiral conveying pipe; Executing step S3: stirring the foaming agent powder and the water source from the water inlet pipe in the foaming liquid mixing tank to a preset concentration by means of a foaming liquid mixing motor; Execute step S4: under the action of the delivery pump, the foaming liquid is output to the foaming liquid transmission pipeline through the foaming liquid output pipeline, and further enters the cutter disc cutting area through the cutter disc rotary joint; Execute step S5: the AI ​​control system adjusts and controls the concentration and flow rate of the foaming liquid according to the monitoring data.

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