CN117656252A - Shield residue soil in-situ pulping system and method - Google Patents

Abstract

The invention discloses a shield slag soil in-situ pulping system and method, relates to the field of shield slag soil in-situ resource utilization, and aims to solve the problems that an existing shield slag soil pulping system is poor in adaptability to complex stratum and has no universality. The shield slag soil in-situ pulping system comprises: the device comprises a feeding module, a vibration screening module and a pulping module, wherein a discharge hole of the feeding module is arranged above a feed hole of the vibration screening module, the discharge hole of the vibration screening module is connected with the feed hole of the pulping module, the vibration screening module comprises a primary vibration screening unit, a grinding and mixing unit and a secondary vibration screening unit, the primary vibration screening unit is used for screening coarse aggregate with the particle size of more than 4mm in shield slag, and the secondary vibration screening unit is used for screening cement particles with the particle size of more than 2mm from the grinding and mixing unit. The method is applied to the system. The in-situ shield residue soil pulping system and method provided by the invention are used for in-situ shield residue soil pulping and utilization aiming at complex stratum.

Description

A shield muck in-situ pulping system and method

Technical field

The invention relates to the technical field of in-situ resource utilization of shield muck, and in particular to a system and method for in-situ pulping of shield muck.

Background technique

The vigorous development of urban rail transit construction has greatly alleviated the pressure of urban traffic congestion, especially urban subways, which have also promoted the economic development of major cities. Shield tunneling method construction has gradually become one of the mainstream construction methods in subway tunnel construction due to its advantages of safety, efficiency, environmental protection, and high degree of mechanization.

At present, synchronous grouting is a key and indispensable link in shield tunneling construction. However, the slurry for simultaneous grouting mainly comes from outsourcing or on-site grouting of outsourced raw materials, which is costly. Moreover, during the shield excavation construction process, we are also faced with the technical problems of large shield dregs production and difficulty in reduction, utilization and treatment.

Therefore, the existing technology generally uses shield muck as raw material to directly produce synchronous grouting slurry. However, most of them are developed for resource utilization of formations with high sand content, and have poor adaptability to complex formations, such as clay formations with low sand content and high viscosity, and rock-soil composite formations. Shield muck is not applicable. Moreover, the simultaneous grouting slurries produced are all cement or cement-based cementitious materials, which still consume a large amount of cement and sand and have poor economic value.

Contents of the invention

The object of the present invention is to provide a system and method for in-situ shield slurry pulping, which can make in-situ shield slag produced from clay strata and rock-soil composite strata with low sand content and high viscosity. It has high adaptability to complex strata and realizes resource utilization of shield muck while reducing grouting costs.

In a first aspect, embodiments of the present invention provide a shield muck in-situ pulping system, which includes a feeding module, a vibrating screening module and a pulping module. The outlet of the feeding module is located on the vibrating screen. Above the feed port of the sub-module, the discharge port of the vibrating screening module is connected to the feed port of the pulping module;

The vibrating screening module includes a primary vibrating screening unit, a grinding and mixing unit and a secondary vibrating screening unit. The outlet of the feeding module is located above the feed port of the primary vibrating screening unit. The discharge port of the first-level vibrating screening unit is connected to the feed port of the grinding and homogenizing unit, and the discharge port of the grinding and homogenizing unit is connected to the feed port of the second-level vibrating screening unit. Connected, the first-level vibrating screening unit is used to screen coarse aggregates with a particle size greater than 4mm in the shield muck, and the second-level vibrating screening unit is used to screen out the grinding and homogenizing unit. Clay particles with a particle size greater than 2 mm.

Compared with the existing technology, the shield muck in-situ pulping system provided by the present invention has the following advantages:

The shield muck in-situ pulping system provided by the embodiment of the present invention includes a feeding module, a vibrating screening module and a pulping module. The outlet of the feeding module is located above the inlet of the vibrating screening module. The discharge port of the screening module is connected with the feed port of the pulping module. Therefore, the feeding module can be used to transport the shield muck to the vibrating screening module for screening, and then the screened shield muck can be transported to the pulping module. Among them, the vibrating screening module includes a first-level vibrating screening unit, a grinding and mixing unit and a second-level vibrating screening unit. The outlet of the feeding module is located above the feed port of the first-level vibrating screening unit. The discharge port of the vibrating screening unit is connected to the feed port of the grinding and homogenizing unit, and the discharge port of the grinding and homogenizing unit is connected to the feed port of the secondary vibrating screening unit. Therefore, the feeding module can be used to transport the shield muck to the first-level vibrating screening unit to screen coarse aggregates with a particle size greater than 4mm in the shield muck, and then transport the screened shield muck to the grinding After the homogenizing unit crushes and mixes the shield mud, it is then transported to the secondary vibrating screening unit to screen out the clay particles with a particle size greater than 2mm in the shield mud, and then the screened shield mud is transported to the pulping module. Carry out grouting to obtain the finished grouting fluid for use in shield tunneling construction. That is to say, embodiments of the present invention can process shield muck in complex formations, such as clay formations with low sand content and high viscosity, and shield muck produced in rock-soil composite formations, for in-situ pulping and pulping. Utilization realizes the resource utilization, reduction, harmless treatment and safe utilization of shield muck, while effectively reducing the cost of simultaneous grouting.

It can be seen from the above that the shield muck in-situ pulping system provided by the embodiment of the present invention can make in-situ shield muck produced from clay strata and rock-soil composite strata with low sand content and high viscosity. It has high adaptability to complex strata and realizes resource utilization of shield muck while reducing grouting costs.

In a second aspect, the present invention also provides a method for in-situ pulping of shield muck, which uses the in-situ pulping system of shield muck described in the first aspect.

Compared with the prior art, the beneficial effects of the shield muck in-situ pulping method provided by the present invention are the same as the beneficial effects of the shield muck in-situ pulping system described in the first aspect, and will not be described again here.

Description of drawings

The drawings described here are used to provide a further understanding of the present invention and constitute a part of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached picture:

Figure 1 is a front view of the shield muck in-situ pulping system according to the embodiment of the present invention;

Figure 2 is a top view of the shield muck in-situ pulping system according to the embodiment of the present invention;

Figure 3 is a front view of the first-level vibrating screening unit according to the embodiment of the present invention;

Figure 4 is a structural schematic diagram of a shield muck in-situ pulping system according to an embodiment of the present invention;

Figure 5 is a preparation flow chart of the shield muck in-situ pulping method according to the embodiment of the present invention;

Figure 6 is a flow chart for preparing shield mud according to an embodiment of the present invention;

Figure 7 is a process flow diagram of the in-situ pulping system according to Embodiment 1 of the present invention;

Figure 8 is a process flow diagram of the in-situ pulping system according to Embodiment 2 of the present invention;

Figure 9 is a comparison of the cumulative settlement and deformation patterns of the ground surface after shield excavation on the left and right lines of the site in Embodiment 4 of the present invention.

Reference signs:

100-Feeding module, 110-Loading unit, 120-Feeding and storage integrated unit, 130-Belt transmission unit, 200-Vibrating screening module, 210-First-level vibrating screening unit, 211-Vibrating screen, 2111- The first vibrating screen, 2112-the second vibrating screen, 2113-the third vibrating screen, 212-spray device, 213-sliding plate, 220-grinding and homogenizing unit, 221-first water inlet pump, 222-hopper, 223 -Motor, 230-secondary vibrating screening unit, 300-pulping module, 310-slurry mixing unit, 311-slurry mixing tank, 312-second water supply pump, 313-first mixer, 314-first pulp pump , 315-second water tank, 320-slurry storage unit, 321-slurry storage tank, 322-second mixer, 323-second pulp pump, 330-feeding unit, 331-vertical silo, 3311-standby vertical type silo, 332-screw conveyor, 333-pneumatic valve, 340-pulping unit, 341-eddy current pulping machine, 342-air compressor air system, 343-mechanical stirring device, 400-water tank, 510-electromagnetic Flow meter, 520-ultrasonic liquid level meter, 530-real-time detection system of slurry specific gravity, 540-weighing unit, 600-control module, 700-grouting pump.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with examples. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more than two, unless otherwise explicitly and specifically limited. "Several" means one or more than one, unless otherwise expressly and specifically limited.

Shield tunneling method construction has gradually become one of the mainstream construction methods in subway tunnel construction due to its advantages of safety, efficiency, environmental protection, and high degree of mechanization. However, huge amounts of shield dregs have gradually become one of the main sources of urban solid waste. According to incomplete statistics, the current shield dregs generated by shield tunneling projects in China exceed 50 million m ³ every year. By the end of 2022, , the accumulated shield muck generated exceeds 450 million m ³ . Therefore, how to reduce shield muck has become a major problem in urban shield construction.

Since the shield muck is mixed with a large amount of foam agents, flocculants and other shield agent materials, it is difficult to use directly. The main manifestations are: high viscosity, high water content (about 30%), drying into lumps, and almost no substance. Directly exploit value. Therefore, how to realize resource utilization of shield muck is another major problem in the shield construction industry.

So far, the only treatment method for shield tunneling debris is to transport it for landfill, and there is no other treatment and utilization technology. In recent years, due to the tightening of national environmental protection policies and the initiative to build "waste-free cities", the transportation and landfilling of shield muck is difficult, costly and causes serious environmental pollution. According to incomplete statistics, the cost of transporting and filling shield muck reaches a maximum of 350RMB/m ³ . Therefore, in-situ treatment of shield muck to achieve reduction and resource utilization has become a pursuit of the shield construction industry. The goal.

Synchronous grouting is a critical and indispensable link in shield construction. There are two main sources of synchronous grouting slurry for shield tunneling construction: ① directly purchased finished slurry (mainly composed of cement, fly ash, fine sand, bentonite, admixtures and water); ② directly prepared on site by purchasing the above raw materials. The outsourcing/preparation of simultaneous grouting materials is one of the main components of the shield construction cost, accounting for about 10% of the shield construction cost, and the cost is high.

Therefore, the existing technology generally uses shield muck as raw material to directly produce synchronous grouting slurry. However, most of them are developed for resource utilization of formations with high sand content, and have poor adaptability to complex formations, such as clay formations with low sand content and high viscosity, and rock-soil composite formations. Shield muck is not applicable. Moreover, the simultaneous grouting slurries produced are all cement or cement-based cementitious materials, which still consume a large amount of cement and sand and have poor economic value.

In response to the above problems, embodiments of the present invention provide a shield muck in-situ pulping system, which can in-situ process the shield muck produced from clay strata and rock-soil composite strata with low sand content and high viscosity. The grouting and utilization has high adaptability to complex strata, realizing resource utilization of shield muck while reducing grouting costs. This solves the problem that the existing shield slag pulping system has poor adaptability to complex strata and no universal applicability.

FIG. 1 shows a front view of a shield tunneling muck in-situ pulping system provided by an embodiment of the present invention, and FIG. 2 shows a top view of a shield tunneling muck in-situ pulping system provided by an embodiment of the present invention. As shown in Figures 1 to 2, the shield muck in-situ pulping system according to the embodiment of the present invention includes a feeding module 100, a vibrating screening module 200 and a pulping module 300. The outlet of the feeding module 100 is located at Above the feed port of the vibrating screening module 200, the discharging port of the vibrating screening module 200 is connected to the discharging port of the pulping module 300.

During specific implementation, the above-mentioned feeding module 100 can be used to transport the shield muck to the vibrating screening module 200 for screening, and then the vibrating screening module 200 can be used to transport the screened shield muck to the pulping module 300 for screening. Pulping.

In an optional manner, the vibrating screening module 200 of the embodiment of the present invention includes a primary vibrating screening unit 210, a grinding and homogenizing unit 220, and a secondary vibrating screening unit 230. The discharging of the feeding module 100 The port is located above the feed port of the first-level vibrating screening unit 210. The discharge port of the first-level vibrating screening unit 210 is connected to the feed port of the grinding and homogenizing unit 220. The discharge port of the grinding and homogenizing unit 220 Located above the feed port of the secondary vibrating screening unit 230, the primary vibrating screening unit 210 is used to screen coarse aggregates with a particle size greater than 4 mm in the shield muck, and the secondary vibrating screening unit 230 is used to The clay particles with a particle size greater than 2 mm coming out of the screening, grinding and homogenizing unit 220 are screened.

During specific implementation, the feeding module 100 can be used to transport the shield muck to the first-level vibrating screening unit 210 to screen coarse aggregates with a particle size greater than 4 mm in the shield muck, and then the screened shield muck can be After being transported to the grinding and homogenizing unit 220 for crushing and stirring to obtain the shield mud, it is then transported to the secondary vibrating screening unit 230 to screen out the clay particles with a particle size greater than 2 mm in the shield mud, thereby screening the shield mud. The mud is transported to the pulping module 300 for pulping, thereby obtaining the finished grouting fluid for use in shield construction. That is to say, embodiments of the present invention can process shield muck in complex formations, such as clay formations with low sand content and high viscosity, and shield muck produced in rock-soil composite formations, for in-situ pulping and pulping. Utilization realizes the resource utilization, reduction, harmless treatment and safe utilization of shield muck, while effectively reducing the cost of simultaneous grouting.

In an implementable manner, FIG. 3 shows a front view of a primary vibrating screening unit provided by an embodiment of the present invention. As shown in Figure 3, the first-level vibrating screening unit 210 in the embodiment of the present invention includes a multi-layer vibrating screen 211, multiple groups of spray devices 212 and slide plates 213. The outlet of the feeding module 100 is located on the multi-layer vibrating screen. above 211. Each group of spray devices 212 is used to spray the mesh of the corresponding layer of vibrating screen 212. The mesh size of the multi-layer vibrating screen 212 decreases from top to bottom. The slide plate 213 is located below the multi-layer vibrating screen 212. . It should be understood that the number of the multi-layer vibrating screens 211 can be set according to actual needs and is not limited here. In the following, the vibrating screen 211 is taken as four layers for illustration.

It should be noted that the above-mentioned spray device 212 may be a high-pressure spray device used to spray water to the vibrating screen 211. The above-mentioned vibrating screen 211 includes a vibrating motor, a main structure of the vibrating screen and a diamond-shaped anti-blocking screen. The vibrating screen can adjust key parameters such as its amplitude and excitation force according to changes in the formation. For example: the amplitude of the vibrating screen can be adjusted to 9mm ~ 10mm, and the exciting force can be 210KN ~ 220kN. When the above vibrating screen 211 is a four-layer vibrating screen, the mesh size of the four-layer vibrating screen 211 can be adjusted from top to bottom. The lower settings are 12mm, 10mm, 8mm and 4mm. The four-layer vibrating screen 211 can be defined from top to bottom as the first vibrating screen 2111, the second vibrating screen 2112, the third vibrating screen 2113 and the fourth vibrating screen 2114.

During specific implementation, the discharge port of the feeding module 100 is located above the multi-layer vibrating screen 211. The feeding module 100 can be used to transport the shield soil to the first vibrating screen 2111, and then the spray device 212 can be used to The screen mesh of the first vibrating screen 2111 is sprayed, so that the shield muck in the screen mesh of the first vibrating screen 2111 becomes shield mud. If there is coarse aggregate larger than 12mm in the shield mud, the first The vibrating screen 2111 separates coarse aggregate larger than 12mm from the shield mud. At this time, aggregates less than 12mm in the shield mud will be screened into the second vibrating screen 2112 through the first vibrating screen 2111. If there are coarse aggregates greater than 10mm in the shield mud, the second vibrating screen 2112 can be used to filter the shield. The coarse aggregate larger than 8mm in the structural mud is separated. At this time, aggregates smaller than 10 mm in the shield mud will be screened into the third vibrating screen 2113 through the second vibrating screen 2112. If there are coarse aggregates larger than 8mm in the shield mud, the third vibrating screen 2113 can be used to separate the coarse aggregates larger than 8mm from the shield mud. At this time, aggregates smaller than 8mm in the shield mud will be screened into the fourth vibrating screen 2114 through the third vibrating screen 2113. If there are coarse aggregates larger than 4mm in the shield mud, the fourth vibrating screen 2114 can be used to separate out the coarse aggregates larger than 8mm in the shield mud. At this time, the aggregates smaller than 8 mm in the shield mud will be screened into the slide plate 213 through the fourth vibrating screen 2111. The slide plate 213 can play an auxiliary flushing role to assist the screened coarse aggregate with a particle size smaller than 4 mm. rinse. It should be understood that the separated coarse aggregate larger than 4mm can be recycled and sold externally.

In an implementable manner, as shown in Figure 3, each layer of vibrating screen 211 in the embodiment of the present invention has a crushing area A, a washing area B and a drying area C. The spray device 212 is arranged in the crushing area A and the washing area. Area B. It should be understood that the crushing zone A, the washing zone B and the drying zone C of each vibrating screen 211 are sequentially distributed along the direction from the feed port to the discharging port of the vibrating screen 211, and the spray device 212 can be provided on each vibrating layer. The screen 211 has sides of the crushing area A and the flushing area B, which are used to spray water into the crushing area A and the flushing area B, so that the shield muck that needs to be screened in each layer of the vibrating screen 211 can be screened first in the crushing area. The shield mud is broken by vibration and sprayed with water by the spray device 212, and then enters the flushing area and uses the spray device 212 to flush the shield mud from the crushing area, and then the shield mud from the flush area enters the drying area for drying. It should be understood that natural air drying can be used for drying here.

Exemplarily, the in-situ pulping system of the embodiment of the present invention also includes a water tank 400, which is used to supply water to the places where water is needed in each unit.

In an implementable manner, the grinding and homogenizing unit 220 of the embodiment of the present invention includes a first water inlet pump 221, a hopper 222, a motor 223, a crushing and stirring assembly and a filter. The water inlet unit 221 is used to transport the water to the hopper 222. Water, crushing and mixing components are arranged in the hopper 222, and the outlet of the hopper 222 is connected to the feed inlet of the secondary vibrating screening unit 230 through a filter screen.

During the specific implementation, the water is transported to the hopper 222 through the above-mentioned water inlet unit 221, mixed with the coarse aggregate with a particle size less than 4 mm coming out of the outlet of the above-mentioned first-level vibrating screening unit 210, and then the crushing in the hopper 222 is used. The mixing component crushes and mixes water and coarse aggregate with a particle size less than 4mm, so that water and shield soil are ground, stirred and evenly mixed, and sprayed onto the filter screen for preliminary filtration, and then the qualified mud flows out. The grout port enters the secondary vibrating screening unit 22 for secondary screening to ensure that the grouting pipeline will not be blocked due to the precipitation of large particles.

Exemplarily, the above-mentioned water inlet unit 221 includes a first water pump, a first water pipe and a first water tank. The first water pipe is arranged at the feed inlet of the hopper 222. The crushing and stirring assembly includes a main shaft and a mixing knife and can drive the main shaft and The driving motor for mixing the mixing blade can be a variable frequency motor.

During the specific implementation, the water is pumped to the hopper 222 through the above-mentioned water pump 33, mixed with the coarse aggregate with a particle size less than 4 mm coming out of the outlet of the above-mentioned first-level vibrating screening unit 210, and then the frequency conversion motor is used to drive the main shaft and the stirrer. Rotate to achieve grinding, stirring and homogeneous mixing of shield mud.

In an implementable manner, as shown in FIGS. 1 to 2 , the pulping module 300 according to the embodiment of the present invention includes a pulping unit 310 , a pulp storage unit 320 , a feeding unit 330 and a pulping unit 340 . Among them, the discharge port of the vibrating screening unit 200 is connected to the feed port of the pulp mixing unit 310, the discharge port of the pulp mixing unit 310 is connected to the feed port of the pulp storage unit 320, and the discharge port of the pulp storage unit 320 is connected with the feed port of the pulp storage unit 320. The outlet of the feeding unit 330 is respectively connected to the feeding inlet of the pulping unit 340. The feeding unit 330 is used to transport solid waste-based gelling materials to the pulping unit 340. Among them, the solid waste-based cementitious material can be the solid waste studied by Wu et al. in the article "Application of a novelgrouting material for prereinforcement of shield tunneling adjacent to existing piles in a soft soil area" published in "Tunnelling and Underground Space Technology" in 2020. As the base cementing material, other suitable cementing materials can also be used, which are not limited here and can be selected according to actual needs. When solid waste-based cementitious materials are used, two wastes are combined into one, so that shield muck can be resourced in situ, source reduced, harmlessly treated, disposed of and safely utilized.

During specific implementation, the shield mud from the above-mentioned vibrating screening unit 200 enters the slurry adjusting unit 310 for slurry adjustment, and the adjusted slurry enters the slurry storage unit 320 for storage and is supplied to the pulping unit 340 when needed. , the feeding unit 330 transports the solid waste-based gelling material to the pulping unit 340 when needed. The pulping unit 340 is used to prepare qualified grouting slurry, so that the grouting slurry can be utilized in situ.

Exemplarily, the above-mentioned slurry mixing unit 310 includes a slurry mixing tank 311, a second water supply pump 312, a first mixer 313, and a first slurry pump 314. Among them, the slurry adjusting unit 310 is arranged in the downstream direction of the grinding and homogenizing unit 220, and maintains an elevation difference of 1.8m to 2.0m in the vertical direction to facilitate the flow of shield mud. The diameter of the slurry mixing tank 311 is 3.0m~3.5m, and the height is 2.0m~2.5m. The inner wall is made of bricks and an anti-seepage membrane is laid, and then smoothed with cement. The mixer 313 has a rotating speed of 25r/min～30r/min and a power of 10kW～15kW.

During specific implementation, the above-mentioned second water supply pump 312 can be used to supply water to the slurry adjustment unit 310, and then the first mixer 313 can be used to mix and stir the water in the slurry adjustment unit 310 and the shield mud coming out of the vibrating screening unit 200.

Exemplarily, the above-mentioned slurry storage unit 320 includes a slurry storage tank 321, a second mixer 322 and a second pulp pump 323. The pulp storage unit 320 and the pulp mixing unit 310 are located at the same elevation and are arranged in parallel. The diameter of the slurry storage tank 321 is 2.8m~3.2m, and the height is 2.0m~2.5m. The inner wall is made of bricks and an anti-seepage membrane is laid, and then smoothed with cement. The rotation speed of the second mixer 322 is 25r/min～30r/min, and the power is 10kW～15kW. It should be understood that the slurry storage unit 320 may be a finished shield slurry tank.

In an optional manner, the above-mentioned feeding unit 330 includes a vertical bin 331, a screw conveyor 332 and a pneumatic valve 333. Vertical silos 331 are used to store solid waste-based cementitious materials. The number of vertical silos 331 can be set according to on-site needs. Generally, one spare vertical silo 3311 needs to be reserved. The pneumatic valve 333 is used to control the operation of the screw conveyor 332 to ensure efficient transportation of solid waste-based gelling materials in the vertical silo 331.

During specific implementation, the pneumatic valve 333 can be used to control the screw conveyor 332 to transport the solid waste-based gelling material to the pulping unit 340.

In an optional manner, the above-mentioned pulping unit 340 includes a vortex pulping machine 341, an air compressor gas line system 342 and a mechanical stirring device 343. The vortex pulper 341 is used to evenly stir the qualified mud slurry in the mud storage tank 321 and the cementitious material in the feeding unit 330 to form a qualified grouting slurry. The mechanical stirring device 343 is arranged on the top of the vortex pulper 341 to improve the mixing and dispersing quality and improve the pulping efficiency.

In an implementable manner, the feeding module 100 of the embodiment of the present invention includes a feeding unit 110, an integrated feeding and storage unit 120, and a belt conveyor unit 130. The feeding unit 110 is used to feed and store the integrated unit. 120 transports shield muck, the outlet of the integrated feed and storage unit 120 is set above the belt conveyor unit 130, and the outlet of the belt conveyor unit 130 is set above the feed inlet of the vibrating screening module 200. Among them, the feeding unit 110 can be a feeding excavator. The inner wall of the feed and storage integrated unit 120 has a silo covered with multiple layers of anti-stick nylon boards. A stirring device is provided in the integrated feeding and storage unit, and a stirring device is installed on the outer wall. Vibration motor.

During specific implementation, the loading unit 110 can be used to transfer the shielded slag in the slag pit to the silo of the integrated feed and storage unit 120, and then the mixing device in the integrated feed and storage unit 120 can be used to mix the large pieces The shield slag is quickly crushed to ensure uniform, stable and continuous discharge to the belt conveyor unit 130 arranged below. Among them, the feeding frequency of the integrated feeding and storage machine can be preset according to on-site needs.

In an implementable manner, the in-situ pulping system of the embodiment of the present invention also includes a monitoring module and a control module 600 electrically connected to the feeding module 100, the vibrating screening module 200 and the pulping module 300. Among them, the monitoring module 500 is used to monitor the water supply flow and slurry flow of the slurry mixing unit 310, the liquid level change of the slurry storage unit 320, the specific gravity of the shield mud in the slurry mixing unit 310, and the solid waste-based gelling material in the feeding unit 330. amount of addition.

For example, the above-mentioned online monitoring module may include multiple electromagnetic flow meters 510 , ultrasonic liquid level meters 520 , a real-time detection system for slurry specific gravity 530 and a weighing unit 540 . The electromagnetic flowmeter 510 is used to monitor the water supply flow and the slurry flow of the rotary slurry pump/grouting pump. The ultrasonic liquid level meter 520 is used for real-time online monitoring of liquid level changes in the slurry storage tank 321, with a monitoring range of 0m to 3.0m. The slurry specific gravity real-time detection system 530 is used to detect the specific gravity of the shield mud in the slurry mixing tank 311 in real time, and timely determine whether the mud performance meets the standard. The weighing unit 540 is installed at the end of the screw conveyor 332 for quantitatively controlling the amount of gelling material.

For example, the control module 600 includes a main power supply cabinet, a power distribution cabinet, a computer console, and control cables. The control module 600 connects the above-mentioned modules and is used to control the start and stop of each module equipment, adjust the operating parameters of each module, and realize continuous, automated, and intelligent pulping.

In an optional manner, when the qualified shield mud slurry enters the above-mentioned mud adjustment unit 310, if the specific gravity of the mud slurry in the mud adjustment tank 311 does not reach the set value, the first mud slurry pump 314 will The shield mud slurry is pumped back to the grinding and homogenizing unit 220 for secondary slurrying. The water supply is adjusted through the computer control module 500 to adjust the specific gravity of the mud. This process is repeated until the specific gravity of the mud slurry in the slurry adjustment tank 311 is The set value of the system is reached, in which the specific gravity of the slurry can be read directly on the computer console through the real-time detection sensor of the slurry specific gravity.

For example, the shield mud slurry in the mud adjustment tank 311 can be pumped to the mud storage tank 321 for storage through the above-mentioned first mud pump 314. The liquid level changes in the mud storage tank 321 are monitored and fed back in real time by an ultrasonic liquid level meter. , the shield mud slurry in the mud storage tank 321 is the finished mud slurry, and the mixer in the mud storage tank 321 maintains low-speed stirring to prevent mud sedimentation and segregation.

For example, a certain volume of finished mud slurry in the storage tank 321 can be pumped by the second pulp pump 323 to the vortex pulper 341, and at the same time, a certain mass of cementitious material can be pumped through the feeding unit 330. (The amount of cementitious material depends on the pumping quality of the above-mentioned finished mud slurry) is transported to the vortex pulping machine 341, and the grouting slurry is prepared through the high-speed rotating vortex and mechanical stirring device 343. The volume of the finished mud is monitored in real time through the electromagnetic flowmeter 410, and the quality of the cementitious material is measured in real time through the weighing unit 440. The prepared grouting slurry is then pumped to the grouting point by a grouting pump 700. The grouting point can be directly used in situ for the shield synchronous grouting operation of this project, or it can be transported out by tanker and used ex-situ for the shield synchronous grouting of other projects and the grouting backfill of the goaf/cave. , roadbed backfilling and other similar projects.

In an example, FIG. 4 shows a structural schematic diagram of a shield muck in-situ pulping system according to an embodiment of the present invention. As shown in Figure 4, the vibrating screening module 200 contained in the shield muck in-situ pulping system according to the embodiment of the present invention may not include the first vibrating screening unit 210. In actual use, the second vibrating screen may be directly used. The sub-unit 230 performs vibration screening.

In an achievable manner, FIG. 5 shows a preparation flow chart of the shield muck in-situ pulping method according to the embodiment of the present invention. As shown in Figure 5, the shield muck in-situ pulping method according to the embodiment of the present invention includes:

Step 501: Use the feeding module to transport the shield muck to the first-level vibrating screening unit of the vibrating screening module.

Step 502: Use the first-level vibration screening unit of the vibration screening module to screen coarse aggregates with a particle size greater than 4 mm in the shield muck to obtain the first shield mud, and use the vibration screening module The first shield mud is crushed by the grinding and mixing unit, and the second-level vibration screening unit of the vibrating screening module is used to screen the clay particles with a particle size greater than 2 mm in the first shield mud to obtain Second shield mud.

Step 503: Use the pulping module to prepare the second shield mud into a qualified grouting slurry.

Exemplarily, FIG. 6 shows a flow chart for preparing shield mud according to an embodiment of the present invention. As shown in Figure 6, the preparation method of shield mud according to the embodiment of the present invention includes:

Step 601: Use the mud adjustment unit to adjust the second shield mud into a shield mud slurry with a qualified specific gravity.

Step 602: Use the mud storage module to store the shield mud slurry with a qualified specific gravity of the mud slurry.

Step 603: Use the feeding unit to transport the solid waste-based gelling material to the pulping unit, and use the slurry storage module to transport the shield mud slurry with qualified specific gravity of the mud slurry to the pulping unit. .

Step 604: Use the pulping unit to prepare qualified grouting slurry.

It can be seen from the above that the embodiment of the present invention realizes the in-situ resource utilization of shield muck in complex formations through the feeding module, vibrating screening module, pulping module, online monitoring module, and central control module, and improves the efficiency of complex formations. It is adaptable and has universal applicability. It is not only suitable for the comprehensive utilization of shield muck in strata with higher sand content, but also for the production of clay strata and rock-soil composite strata with less sand content and high viscosity. The resource reuse of shield muck. On the one hand, it realizes the direct utilization of coarse aggregate for external sales products; more importantly, on the other hand, it realizes the in-situ preparation of grouting slurry using shield muck as aggregate, which can be directly used in-situ for on-site synchronization. Grouting can also be used ex-situ for grouting or backfilling in other sites. It reduces a large number of complex pre-treatment processes, has high pulping efficiency, is environmentally friendly, pollution-free, safe and reliable.

Embodiment 1

Aiming at the shield muck produced in rock-soil composite strata. The shield muck produced in this formation is composed of rock particles/aggregates and soil particles (for example, clay, sand, etc.). The in-situ pulping system includes a feeding module, a vibrating screening module, a pulping module, an online monitoring module, and a central control module. The vibrating screening module includes a primary vibration screening unit, a grinding and homogenizing unit, and a secondary vibration Screening unit. Figure 7 is a process flow diagram of the in-situ pulping system according to Embodiment 1 of the present invention. As shown in Figure 7,

1. Use the loading excavator to transfer the shield muck in the muck pit to the feeder and storage integrated machine bin. The feeder and storage integrated machine will quickly mix and break up the shield muck to prepare the subsequent shield muck. Provides the basis for efficient screening of medium and coarse particles.

2. The stirred and dispersed slag is fed to the first-level vibrating screening unit through a belt conveyor. The feeding frequency is preset by the central control module according to on-site needs. Coarse aggregates with a particle size greater than 4mm are screened. come out, and the vibrating screen is washed through the high-pressure spray device in layered and divided areas, and with the assistance of the chute under the screen, the mud content in the coarse aggregate is reduced.

3. After passing through the first-level vibrating screening unit, the coarse aggregate with a particle size greater than 4mm is separated, and the remaining fine mud and sand directly enter the grinding and homogenizing unit, and a certain pressure of water is pumped to the grinding and homogenizing unit through the water supply pump. In the box, the fine mud and sand are ground, stirred, dispersed and primary filtered to form a mud slurry with a certain specific gravity.

4. The mud slurry formed after the grinding and homogenizing unit enters the secondary vibrating screening unit to further filter out the insoluble clay particles and impurities that are thick and have a particle size greater than 2 mm in the slurry to ensure that the grouting pipeline is not Large particles precipitate and block the pipe, eventually forming a qualified shield mud slurry.

5. The qualified shield mud slurry enters the mud mixing module. If the proportion of the mud slurry in the mud mixing tank does not reach the set value, the qualified shield mud slurry will be pumped back to the grinding and homogenizing unit by the rotary mud pump. For secondary pulping, the computer control system adjusts the water supply to adjust the specific gravity of the mud. This process is repeated until the specific gravity of the mud slurry in the pulp adjustment tank reaches the set value of the system. The specific gravity of the slurry can be measured in real time through the specific gravity of the slurry. Detection sensors are read directly on the computer console.

6. The shield mud slurry in the mud adjustment tank is pumped to the mud storage tank for storage through the mud pump. The liquid level changes in the mud tank are monitored and fed back in real time by the ultrasonic level meter. The shield mud slurry in the mud storage tank is This is the finished mud slurry. The mixer in the slurry storage tank maintains low-speed stirring to prevent mud from settling and segregating.

7. A certain volume of finished mud slurry in the slurry storage tank is pumped to the eddy current pulper by the pulp pump. At the same time, a certain quality of gelling material is pumped through the feeding unit (the amount of gelling material depends on The pumping quality of the above-mentioned finished mud slurry) is transported to the vortex pulping machine, and the grouting slurry is prepared through high-speed rotating vortex and mechanical stirring device. The volume of the finished mud is monitored in real time through an electromagnetic flowmeter, and the quality of the cementitious material is measured in real time through a weighing unit.

8. Pump the prepared grouting slurry to the grouting point through the grouting pump. The grouting point can be directly used in situ for the shield synchronous grouting operation of this project, or it can be transported out by tanker and used ex-situ for the shield synchronous grouting of other projects and the grouting backfill of the goaf/cave. , roadbed backfilling and other similar projects.

Embodiment 2

Shield muck produced for pure soil formations (for example, clay formations, sandy soil formations or clay-sand mixed formations). The shield muck produced by this formation is entirely composed of soil particles (for example, clay, sand, etc.). Figure 8 is a process flow chart of the in-situ pulping system according to Embodiment 2 of the present invention.

Different from the first embodiment, the shield muck produced in the formation of the second embodiment is completely composed of soil particles. Therefore, there is no need to use a first-level vibrating screening unit for coarse screening. The generated shield muck can be directly passed through the upper layer. The material excavator, the feed and storage integrated machine and the belt conveyor enter the secondary vibrating screening unit to filter out the insoluble clay particles with a particle size greater than 2 mm. The subsequent steps are exactly the same as those in Example 1, so no Again.

Embodiment 3

Targeted at shield muck generated from pure rock formations. The shield muck produced by this formation consists entirely of rock particles/aggregates. The processing process of the third embodiment is consistent with that of the first embodiment, and therefore will not be described again.

Embodiment 4

The shield tunneling slag in-situ pulping system and method according to the embodiment of the present invention have been applied in the shield tunnel of Suzhou Metro Line 6. The strata of the shield tunnel of Suzhou Metro Line 6 are mainly silt sand, silt, and silty clay strata, which are typical pure soil strata. Therefore, according to the pulping process steps of the second embodiment above, the shield tunnel can be directly used for tunneling. The generated shield muck is grouted in situ (for example, used for in situ simultaneous grouting operations) without the need for pretreatment screening. On-site results show that the entire pulping system equipment is operating normally and can stabilize pulping and supply. No segment misalignment, cracks or leakage have been observed. The site has continuously supplied slurry to the right-line shield for more than 100 cycles, and no incidents have occurred. Any shutdown and pipe blockage accidents. The prepared new synchronous grouting slurry has an obvious control effect on surface deformation, which is better than the control effect of traditional cement-based finished grout. Figure 9 is a comparison of the cumulative settlement and deformation patterns of the ground surface after shield excavation on the left and right lines of the site in Embodiment 4 of the present invention.

The above field test results and the data in Figure 9 show that the embodiment of the present invention proposes an in-situ grouting system and a complete set of processes that completely use shield muck as aggregate, right line (prepared new synchronous grouting slurry) The average cumulative settlement is 40% to 50% lower than the left line (traditional cement-based finished slurry), and the prepared grouting slurry also has obvious advantages, and can be used to convert clay formations and rock formations with low sand content and high viscosity into The shield muck produced in -soil composite strata is pulped and utilized in situ, so that the resource utilization of shield muck in complex strata can be realized.

The above are only specific embodiments of the present invention. Obviously, various modifications and combinations can be made without departing from the spirit and scope of the present invention. Accordingly, the specification and drawings are intended to be illustrative only of the invention as defined by the appended claims and are to be construed to cover any and all modifications, variations, combinations or equivalents within the scope of the invention. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the invention. In this way, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies, the present invention is intended to include these modifications and variations. Any person familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present invention, and they should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (10)

1. A shield muck in-situ pulping system, characterized in that it includes a feeding module, a vibrating screening module and a pulping module, and the outlet of the feeding module is located at the end of the vibrating screening module. Above the feed port, the discharge port of the vibrating screening module is connected to the feed port of the pulping module; The vibrating screening module includes a primary vibrating screening unit, a grinding and mixing unit and a secondary vibrating screening unit. The outlet of the feeding module is located above the feed port of the primary vibrating screening unit. The discharge port of the first-level vibrating screening unit is connected to the feed port of the grinding and homogenizing unit, and the discharge port of the grinding and homogenizing unit is located at the feed port of the second-level vibrating screening unit. Above the mouth, the first-level vibrating screening unit is used to screen coarse aggregates with a particle size greater than 4mm in the shield muck, and the second-level vibrating screening unit is used to screen the grinding homogeneous mixture. The cement particles coming out of the unit have a particle size greater than 2mm. 2. The shield muck in-situ pulping system according to claim 1, characterized in that the first-level vibrating screening unit includes a multi-layer vibrating screen, multiple groups of spray devices and slides, and the feeding The outlet of the module is located above the multi-layer vibrating screen. Each group of spray devices is used to spray the screen mesh of the corresponding layer of the vibrating screen. The mesh size of the multi-layer vibrating screen is given by The size decreases from top to bottom, and the sliding plate is provided below the multi-layer vibrating screen. 3. The shield muck in-situ pulping system according to claim 2, characterized in that each layer of the vibrating screen has a crushing area, a flushing area and a drying area, and the spray device is arranged on the crushing area. area and the flush area. 4. The shield muck in-situ pulping system according to claim 1, characterized in that the grinding and homogenizing unit includes a first water inlet pump, a hopper, a crushing and stirring assembly and a filter screen, and the water inlet unit It is used to transport water to the hopper. The crushing and stirring assembly is located in the hopper. The outlet of the hopper is connected to the feed port of the secondary vibrating screening unit through the filter screen. 5. The shield muck in-situ pulping system according to claim 1, characterized in that the pulping module includes a pulping unit, a pulp storage unit, a feeding unit and a pulping unit, and the vibrating screening unit The discharge port of the unit is connected to the feed port of the pulp mixing unit, the discharge port of the pulp mixing unit is connected to the feed port of the pulp storage unit, and the discharge port of the pulp storage unit is connected to the feed port of the pulp storage unit. The outlet of the feeding unit is respectively connected to the inlet of the pulping unit, and the feeding unit is used to transport solid waste-based gelling materials to the pulping unit. 6. The shield muck in-situ pulping system according to claim 1, characterized in that the feeding module includes a feeding unit, a feeding and storage integrated unit and a belt transmission unit, and the feeding unit is In order to transport shield muck to the integrated feeding and storage unit, the discharge port of the integrated feeding and storage unit is provided above the belt transmission unit, and the discharge port of the belt transmission unit is provided at the Above the feed port of the vibrating screening module. 7. The shield muck in-situ slurrying system according to claim 6, characterized in that a stirring device is provided in the integrated feeding and storage unit, and the inner wall of the integrated feeding and storage unit is paved with multiple layers. Layer of anti-stick nylon board. 8. The shield muck in-situ pulping system according to any one of claims 1 to 7, characterized in that the in-situ pulping system further includes a monitoring module and the feeding module, the vibration A control module electrically connected to the screening module and the pulping module; The monitoring module is used to monitor the water supply flow and slurry flow of the slurry mixing unit, the liquid level change of the slurry storage unit, the specific gravity of the shield mud in the slurry mixing unit, and the solid waste base in the feeding unit. The amount of cementitious material added. 9. A method for shield muck in-situ pulping, applied to the shield muck in-situ pulping system according to any one of claims 1 to 8, characterized in that it includes: The feeding module is used to transport the shield muck to the first-level vibrating screening unit of the vibrating screening module; The first-level vibrating screening unit of the vibrating screening module is used to screen the coarse aggregate with a particle size greater than 4mm in the shield muck to obtain the first shield mud. The grinding and mixing unit crushes the first shield mud, and uses the secondary vibrating screening unit of the vibration screening module to screen the clay particles with a particle size greater than 2 mm in the first shield mud to obtain the second shield structure mud; The second shield mud is prepared into qualified grouting slurry using the slurry making module. 10. A method for in-situ slurrying of shield muck according to claim 9, wherein said utilizing the pulping module to prepare said second shield slurry into shield slurry includes: Using the mud adjustment unit to adjust the second shield mud into a shield mud slurry with a qualified specific gravity of the mud slurry; Utilize the slurry storage module to store shield mud slurry with a qualified specific gravity of the mud slurry; The feeding unit is used to transport the solid waste-based gelling material to the pulping unit, and the slurry storage module is used to transport shield mud slurry with qualified specific gravity of the mud slurry to the pulping unit; The grouting unit is used to prepare qualified grouting slurry.