Deslagging system of earth pressure balance shield tunneling machine and using method

Abstract

The invention discloses an earth pressure balance shield machine deslagging system and a using method, and relates to the technical field of muck treatment. The pretreatment unit is used for screening large rock particles in the shield muck; adjusting a slurry unit: adding water to dilute the slurry, and deodorizing and defoaming the residual foaming agent in the slurry; the mud and sand separation unit is used for defoamed and diluted slurry; the pretreatment unit and the mud and sand separation unit are arranged, so that the treatment capacity and adaptability of the equipment are improved, and the treatment capacity and adaptability of different types of muck are improved. According to the invention, the quality of regenerated sand is improved through the mud and sand separation unit, the mud cake is subjected to resourceful treatment of turning waste into wealth, and the application potential of the mud cake is developed and expanded. In addition, simple and convenient operation and high operation efficiency of the device are realized through the integrated control unit, a few-person management result on a working site is obtained, and the intelligent and integrated effects are remarkable.

Description

Technical Field

[0001] The present invention relates to the technical field of slag treatment, and in particular to a slag discharging system of an earth pressure balance shield machine and a use method thereof. Background Art

[0002] In the construction of earth pressure balance shield for urban rail transit (including tunnels and subways), the transportation and discharge of slag in the strata with high water content is very difficult in the actual construction process. For example, the scattered mud at the construction site will have a negative impact on the site environment and environmental sanitation, and will require some investment in cleaning. In addition, the abandoned soil generally does not meet the standards of the environmental protection department for the collection of waste. Therefore, in order to discharge slag from strata with high water content, it is urgent to optimize the slag discharge system of earth pressure balance shield subway construction, which has become an important concern and practical problem in earth pressure balance shield construction.

[0003] For a relatively complete earth pressure balance shield slag disposal process, the shield slag can be processed into gravel, sand and mud cake, and the moisture content of each component material meets the specific requirements, but there are the following problems:

[0004] 1. The equipment has weak adaptability to the strata and insufficient on-site processing capacity. Due to the complexity of the strata soil, the soil changes significantly during the shield tunneling process. It was found that the soil layer changes in the shield section may cause overflow mud, difficulty in screening by the vibrating screen, and high mud content in fine sand.

[0005] 2. The mud cake is not properly treated to "turn waste into treasure", and the regenerated sand contains a high amount of mud. The mass fraction of the regenerated sand contains a high amount of mud. In addition, the presence of a certain amount of flocculant in it requires the optimization and transformation of the currently used sand removal equipment.

[0006] 3. The degree of intelligence, integration and modularization of shield slag handling equipment is relatively low.

[0007] Therefore, a slag discharging system of an earth pressure balance shield machine and a use method thereof are proposed. Summary of the invention

[0008] The purpose of the present invention is to solve the problems mentioned in the above background technology, and provide a slag discharge system and a use method of an earth pressure balance shield machine.

[0009] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0010] A slag discharging system for an earth pressure balance shield machine, comprising:

[0011] Pre-treatment unit: Screening of large rock particles in shield slag;

[0012] Adjust the mud unit: add water to dilute the mud, and deodorize and defoam the residual foaming agent in the mud;

[0013] Mud and sand separation unit: The slurry after defoaming and dilution is transported to the sand removal equipment to separate the mud and sand;

[0014] Mud concentration unit: transports the engineering mud with separated sand particles in the mud pool to the mud concentration tank for further concentration;

[0015] Filter pressing and dehydration unit: transport the concentrated mud to the filter press for filtration and dehydration;

[0016] Tail water treatment unit: The tail water generated in the process of mud treatment is treated and purified by chemical, biological and physical methods;

[0017] Integrated control unit: includes human-computer interaction system, monitoring communication system and programmable logic controller (PLC) system.

[0018] Furthermore, the pretreatment unit comprises three layers of vibrating screens, and the mesh specifications of the three layers of vibrating screens are different.

[0019] Furthermore, the mud and sand separation unit includes an automatic flocculant introduction module, an energy dissipation chassis, an inclined plate sedimentation module, a drainage module and a mud discharge module.

[0020] Furthermore, the mud and sand separation unit also includes a sand removal module, and the sand removal module includes a dewatering vibrating screen and a hydrocyclone.

[0021] Furthermore, the integrated control unit also includes intelligent particle size analysis equipment, intelligent mud and sand classification equipment and an automatic dosing instrument. The automatic dosing instrument is used to quantitatively control the amount of flocculant used and transmit the parameters to the visual terminal for information interaction among the devices.

[0022] A method for using a slag discharging system of an earth pressure balance shield machine comprises the following steps:

[0023] Step 1: Use the pretreatment unit to pre-screen the shield slag, screen out the large rock particles, and use high-pressure water flow to disperse the mud;

[0024] Step 2: Use the mud adjustment unit to dilute the mud and deodorize and defoam the residual foaming agent in the mud;

[0025] Step 3: The slurry that has been defoamed and diluted is transported to the sand removal device through the mud and sand separation unit to efficiently separate the mud and sand therein;

[0026] Step 4: In the mud concentration unit, the separated engineering mud containing sand particles is transferred to the mud concentration tank, where the mud undergoes a further concentration process, so that the concentration of solid components in it is significantly increased;

[0027] Filter pressing and dehydration: The concentrated mud is transported to the filter press by the filter pressing and dehydration unit for filter pressing and dehydration, so that the mass fraction of water in the mud cake formed by the mud after filter pressing and dehydration is significantly reduced;

[0028] Step 5: The tail water treatment unit purifies the tail water produced through a multi-stage purification process that combines chemical, biological and physical treatment technologies to ensure that it meets environmental standards before discharge.

[0029] Furthermore, in the mud cake formed by the mud after the filter pressing and dehydration in the filter pressing and dehydration unit, the mass fraction of water is less than 40%.

[0030] The beneficial effects of the present invention are as follows:

[0031] In the present invention, by setting up a pretreatment unit and a mud-sand separation unit, the processing capacity and adaptability of the equipment are improved, and the processing capacity and adaptability of different types of slag are improved. The present invention improves the quality of regenerated sand by separating the mud-sand unit, and treats the mud cake as a resource, thereby giving play to and expanding the application potential of the mud cake. In addition, the present invention realizes simple operation and high operating efficiency of the device through an integrated control unit, achieves the result of less-managed management at the work site, and achieves significant effects of intelligence and integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the system structure of the present invention; DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0036] The electrical components mentioned in this article are all connected to an external main controller and 220V mains electricity, and the main controller can be a conventional known device for controlling a computer or the like.

[0037] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] like Figure 1 As shown, a slag discharging system for an earth pressure balance shield machine includes a pre-processing unit for screening large rock particles in shield slag;

[0039] Adjust the mud unit: add water to dilute the mud, and deodorize and defoam the residual foaming agent in the mud;

[0040] Mud and sand separation unit: The slurry after defoaming and dilution is transported to the sand removal equipment to separate the mud and sand;

[0041] Mud concentration unit: transports the engineering mud from which sand particles have been separated in the mud pool to the mud concentration tank for further concentration; this unit is used to increase the solid content in the mud;

[0042] Filter pressing and dehydration unit: transport the concentrated mud to the filter press for filtration and dehydration;

[0043] Tail water treatment unit: The tail water generated in the process of mud treatment is treated and purified by chemical, biological and physical methods;

[0044] Integrated control unit: including human-machine interaction system, monitoring communication system and programmable logic controller (PLC) system. The integrated control unit can meet the basic needs of manual control or remote automatic control in the control room, local control on site, key parameter detection and system fault alarm.

[0045] The pretreatment unit includes three layers of vibrating screens, and the mesh specifications of the three layers of vibrating screens are different. If an unreasonable screen diameter is selected, or a screening device with poor parameter adjustability is selected, it will cause the shield slag to clog when the components of the slag change, thus affecting the subsequent finished product performance and system processing efficiency. Therefore, in the selection of screening vibration devices, the specific type of slag in the shield section needs to be reasonably confirmed and verified, and the adjustable exciting force, amplitude range and frequency range should be prioritized. In addition, a three-layer screening screen device with high screening efficiency and not easy to cause blockage should be selected.

[0046] The mud and sand separation unit includes an automatic flocculant introduction module, an energy dissipation chassis, an inclined plate sedimentation module, a drainage module and a mud discharge module. In the mud and sand separation unit, the sedimentation tower commonly used before is generally built by on-site assembly, so it is difficult to achieve recycling. By using the automatic flocculant introduction module, the energy dissipation chassis, the inclined plate sedimentation module, the drainage module and the mud discharge module, it can be easily recycled.

[0047] The mud and sand separation unit also includes a sand removal module, which includes a dewatering vibrating screen and a hydrocyclone. Due to the relevant limitations of the specific construction site, it is not appropriate to "turn waste into treasure" for the mud cake, especially for such operations at the construction site, but it can be "resourced" in other ways, such as transporting the mud cake to a centralized slag treatment site for treatment, rather than directly transporting it to a designated location outside the construction site for treatment or landfill. The current situation is that drum sand washers and large-diameter hydrocyclones can only effectively separate mud and sand, but there are great difficulties in separating silt and clay, and the application potential of mud cakes cannot be exerted and expanded. Therefore, the combination of a dewatering vibrating screen and a hydrocyclone can realize the ecological treatment of shield slag. In some embodiments, a desilter can also be added to the sand removal module.

[0048] The integrated control unit also includes intelligent equipment for particle size analysis, intelligent equipment for mud and sand classification, and automatic dosing equipment. The automatic dosing equipment is used to quantitatively control the amount of flocculant used and transmit the parameters to the visual terminal for information interaction among the devices. Real-time understanding and monitoring of the specific conditions of each device can not only improve efficiency but also reduce personnel costs. Before arranging the site, the information model of the previous building can be used to integrate the assembly equipment and establish an actual simulation scene model, so as to make full use of the existing site, solve the problem of incomplete matching of processing capacity and site status, and provide specific basis for the assembly site.

[0049] A method for using a slag discharging system of an earth pressure balance shield machine comprises the following steps:

[0050] Step 1: Use the pretreatment unit to pre-screen the shield slag, screen out the large rock particles, and use high-pressure water flow to disperse the mud;

[0051] Step 2: Use the mud adjustment unit to dilute the mud and deodorize and defoam the residual foaming agent in the mud;

[0052] Step 3: The slurry that has been defoamed and diluted is transported to the sand removal device through the mud and sand separation unit to efficiently separate the mud and sand therein;

[0053] Step 4: In the mud concentration unit, the separated engineering mud containing sand particles is transferred to the mud concentration tank, where the mud undergoes a further concentration process, so that the concentration of solid components in it is significantly increased;

[0054] Filter pressing and dehydration: The concentrated mud is transported to the filter press by the filter pressing and dehydration unit for filter pressing and dehydration, so that the mass fraction of water in the mud cake formed by the mud after filter pressing and dehydration is significantly reduced;

[0055] Step 5: The tail water treatment unit purifies the generated tail water through a multi-stage purification process, which integrates chemical, biological and physical treatment technologies to ensure that it meets environmental protection standards before discharge.

[0056] In the mud cake formed by the mud after the slurry is dehydrated by filtration in the filtration and dehydration unit, the mass fraction of water is less than 40%.

[0057] In summary: In the present invention, by setting up a pretreatment unit and a mud and sand separation unit, the processing capacity and adaptability of the equipment are improved, and the processing capacity and adaptability of different types of slag are improved. The present invention improves the quality of regenerated sand by separating the mud and sand units, and treats the mud cake as a resource, thereby giving play to and expanding the application potential of the mud cake. In addition, the present invention realizes simple operation and high operating efficiency of the device through an integrated control unit, achieves the result of less-managed management at the work site, and achieves remarkable results in intelligence and integration.

[0058] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A slag discharging system for an earth pressure balance shield machine, characterized in that: include: Pre-treatment unit: Screening of large rock particles in shield slag; Adjust the mud unit: add water to dilute the mud, and deodorize and defoam the residual foaming agent in the mud; Mud and sand separation unit: The slurry after defoaming and dilution is transported to the sand removal equipment to separate the mud and sand; Mud concentration unit: transports the engineering mud with separated sand particles in the mud pool to the mud concentration tank for further concentration; Filter pressing and dehydration unit: transport the concentrated mud to the filter press for filtration and dehydration; Tail water treatment unit: The tail water generated in the process of mud treatment is treated and purified by chemical, biological and physical methods; Integrated control unit: includes human-computer interaction system, monitoring communication system and programmable logic controller (PLC) system.

2. The slag discharge system of an earth pressure balance shield machine according to claim 1, characterized in that: The pretreatment unit comprises three layers of vibrating screens, and the mesh specifications of the three layers of vibrating screens are different.

3. The slag discharging system of an earth pressure balance shield machine according to claim 1, characterized in that: The mud and sand separation unit comprises an automatic flocculant introduction module, an energy dissipation chassis, an inclined plate sedimentation module, a drainage module and a mud discharge module.

4. The slag discharge system of an earth pressure balance shield machine according to claim 1, characterized in that: The mud and sand separation unit also includes a sand removal module, and the sand removal module includes a dewatering vibrating screen and a hydrocyclone.

5. The slag discharging system of an earth pressure balance shield machine according to claim 1, characterized in that: The integrated control unit also includes intelligent particle size analysis equipment, intelligent mud and sand classification equipment and an automatic dosing instrument. The automatic dosing instrument is used to quantitatively control the amount of flocculant used and transmit the parameters to the visual terminal for information interaction between various devices.

6. A method for using the slag discharge system of an earth pressure balance shield machine according to any one of claims 1 to 5, comprising the following steps: Step 1: Use the pretreatment unit to pre-screen the shield slag, screen out the large rock particles, and use high-pressure water flow to disperse the mud; Step 2: Use the mud adjustment unit to dilute the mud and deodorize and defoam the residual foaming agent in the mud; Step 3: The slurry that has been defoamed and diluted is transported to the sand removal device through the mud and sand separation unit to efficiently separate the mud and sand therein; Step 4: In the mud concentration unit, the separated engineering mud containing sand particles is transferred to the mud concentration tank, where the mud undergoes a further concentration process, so that the concentration of solid components in it is significantly increased; Filter pressing and dehydration: The concentrated mud is transported to the filter press by the filter pressing and dehydration unit for filter pressing and dehydration, so that the mass fraction of water in the mud cake formed by the mud after filter pressing and dehydration is significantly reduced; Step 5: The tail water treatment unit purifies the generated tail water through a multi-stage purification process, which integrates chemical, biological and physical treatment technologies to ensure that it meets environmental protection standards before discharge.

7. The method for using the slag discharge system of an earth pressure balance shield machine according to claim 6, characterized in that: In the mud cake formed by the mud after the slurry is dehydrated by filtration in the filtration and dehydration unit, the mass fraction of water is less than 40%.

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