A monitoring system and method for abandoned slurry in a large-diameter slurry shield tunnel

Abstract

The present invention provides a monitoring system and method for waste mud in a large-diameter slurry shield tunnel. The monitoring system includes a main slurry discharge pipe, a slurry separation device, a discharge pipe, a sedimentation tank, a slurry conditioning tank, a clear water pipe, a first slurry pump, a waste slurry pipe, a second slurry pump, a main slurry inlet pipe, a data acquisition module, a data base station, and a slurry monitoring platform. The data acquisition module includes a first liquid level sensor, a second liquid level sensor, a first flowmeter, a second flowmeter, a first tuning fork resonance densitometer, a second tuning fork resonance densitometer, a third tuning fork resonance densitometer, and a data acquisition device. The data acquisition device is wirelessly connected to the data base station, and the data base station is wirelessly connected to the slurry monitoring platform. The slurry monitoring platform is used for analyzing, processing, and storing data. The present invention can accurately monitor the amount of waste mud generated during the construction of a large-diameter slurry shield, and can provide a decision-making basis for the disposal and management of waste mud during the construction of a slurry shield tunnel.

Description

Technical Field

[0001] The present invention relates to the technical field of slurry monitoring for large-diameter slurry shield tunnels, and particularly to a monitoring system and method for waste slurry in large-diameter slurry shield tunnels. Background Art

[0002] The construction technology of large-diameter slurry shield tunnels is one of the key technologies in the field of major underground engineering construction. However, the amount of waste slurry generated during its construction has reached new highs, which has become a key problem restricting the green and efficient development of this field. The slurry generated during the construction of large-diameter slurry shield tunnels is transported from the main slurry discharge pipe inside the tunnel to the ground sedimentation tank and slurry adjustment tank. For the slurry in the sedimentation tank and slurry adjustment tank, a part of it is pumped by a slurry pump to the excavation face to maintain the stability of the excavation face, and the slurry that cannot be pumped to the excavation face is regarded as waste slurry.

[0003] In the prior art, the monitoring parameters for the amount of shield slurry are mainly density and viscosity to maintain the stability of the shield excavation face and ensure the slag-carrying capacity of the slurry. However, there is a lack of accurate monitoring technology for the output of waste slurry. Since the amount of waste slurry generated during shield construction cannot be accurately monitored, the staff can only rely on experience to select and design the supporting mud treatment system, resulting in the problem that the disposal capacity of the mud treatment system for waste slurry does not match the actual output of waste slurry during shield construction. Furthermore, the situation of untimely treatment of waste slurry during shield construction frequently occurs. This not only causes the sedimentation tank and slurry adjustment tank to overflow, resulting in environmental pollution, but also severely restricts the shield construction efficiency. Therefore, the accurate monitoring of the amount of waste slurry is of great significance for the design of the mud treatment system and the high-efficiency construction of the shield.

[0004] The invention patent application with the domestic publication number CN117030370A discloses a shield slurry automatic measuring device and its usage method, which can automatically measure three parameters of the slurry pH, viscosity, and density in the slurry inlet pipe, facilitating the staff to timely master the slurry properties during the shield tunneling process and providing a basis for slurry parameter and slurry inflow and outflow control. However, during the implementation of the above solution, the amount of waste slurry generated during the construction of large-diameter slurry shield tunnels cannot be accurately monitored. Summary of the Invention

[0005] Aiming at the defect that the prior art lacks accurate monitoring of the output of waste slurry, the present invention provides a monitoring system and method for waste slurry in large-diameter slurry shield tunnels to meet the accurate monitoring of the output of waste slurry during the construction process of slurry shield tunnels.

[0006] On the one hand, the present invention proposes a monitoring system for waste mud in a large-diameter slurry shield tunnel, comprising: a main slurry discharge pipe, a slurry separation device, a discharge pipe, a sedimentation tank, a slurry adjustment tank, a clear water pipe, a first slurry pump, a waste slurry pipe, a second slurry pump, a main slurry inlet pipe, a data acquisition module, a data base station and a slurry monitoring platform;

[0007] The main slurry discharge pipe is used for connecting the slurry separation device with the shield machine; one end of the discharge pipe is connected to the slurry separation device, and the other end discharges the screened slurry into the sedimentation tank. The sedimentation tank includes a sedimentation tank slurry storage tank, a sedimentation tank wall and a slurry inlet channel. The slurry inlet channel is connected to the slurry adjustment tank. The slurry adjustment tank includes a slurry adjustment tank slurry storage tank and a slurry adjustment tank wall. One end of the first slurry pump is connected to the slurry adjustment tank, and the other end is connected to the main slurry inlet pipe. The second slurry pump includes a slurry pump body, a tee pipe, a first gate valve and a second gate valve. One end of the slurry pump body is connected to the main pipe of the tee pipe, and the other end is connected to the waste slurry pipe. The two branch pipes of the tee pipe are respectively connected to the slurry adjustment tank and the sedimentation tank. The clear water pipe is used for conveying clear water to the sedimentation tank;

[0008] The data acquisition module includes a first liquid level sensor for monitoring the liquid level of the sedimentation tank, a second liquid level sensor for monitoring the liquid level of the slurry adjustment tank, a first flowmeter for monitoring the flow rate of the waste slurry pipe, a second flowmeter for monitoring the flow rate of the clear water pipe, a first tuning fork resonance type density meter for monitoring the density of the slurry in the sedimentation tank, a second tuning fork resonance type density meter for monitoring the density of the slurry in the slurry adjustment tank, a third tuning fork resonance type density meter for monitoring the density of the waste slurry in the waste slurry pipe, and a data acquisition device. The data acquisition device is electrically connected to the first liquid level sensor, the second liquid level sensor, the first flowmeter, the second flowmeter, the first tuning fork resonance type density meter, the second tuning fork resonance type density meter and the third tuning fork resonance type density meter;

[0009] The data acquisition device is wirelessly connected to the data base station, and the data base station is wirelessly connected to the slurry monitoring platform;

[0010] The slurry monitoring platform is used for analyzing, processing and storing data, adjusting the data acquisition frequency of the data acquisition module and querying the data of the data acquisition module in real time.

[0011] Further, the first liquid level sensor is installed on the first liquid level sensor installation part. One end of the first liquid level sensor installation part is fixed to the top of the sedimentation tank wall by bolts, and the other end extends above the sedimentation tank slurry storage tank and installs the first liquid level sensor; the second liquid level sensor is installed on the second liquid level sensor installation part. One end of the second liquid level sensor installation part is fixed to the top of the slurry adjustment tank wall by bolts, and the other end extends above the slurry adjustment tank slurry storage tank and installs the second liquid level sensor.

[0012] Further, the first flowmeter and the second flowmeter are respectively installed in the horizontal sections of the waste slurry pipe and the clear water pipe, and are used to monitor the waste slurry flow in the waste slurry pipe and the clear water flow in the clear water pipe in sequence. Preferably, both the first flowmeter and the second flowmeter are electromagnetic flowmeters.

[0013] Further, the first tuning fork resonance type density meter is installed on the first density meter installation part. One end of the first density meter installation part is fixed to the top of the sedimentation tank wall through bolts, and the other end extends above the slurry storage tank of the sedimentation tank and installs the first tuning fork resonance type density meter. The bottom of the first tuning fork resonance type density meter is below the slurry liquid level in the sedimentation tank; the second tuning fork resonance type density meter is installed on the second density meter installation part. One end of the second density meter installation part is fixed to the top of the slurry mixing tank wall through bolts, and the other end extends above the slurry storage tank of the slurry mixing tank and installs the second tuning fork resonance type density meter. The bottom of the second tuning fork resonance type density meter is below the slurry liquid level in the slurry mixing tank.

[0014] Further, the third tuning fork resonance type density meter is installed on the third density meter installation part. The third density meter installation part includes a main bypass pipe and a small bypass pipe. The head of the main bypass pipe is connected to the waste slurry pipe, the head of the small bypass pipe is connected to the waste slurry pipe, the tail of the small bypass pipe is vertically connected to the main bypass pipe, and the tail of the main bypass pipe is connected to the third tuning fork resonance type density meter through a flange; the third tuning fork resonance type density meter sequentially includes a machine head, a flange plate, a connecting column and a fork body. The third density meter installation part is installed in the horizontal section of the waste slurry pipe. Under the action of the second slurry pump, part of the waste slurry in the waste slurry pipe first enters the main bypass pipe through the small bypass pipe. After the waste slurry contacts the fork body, it then flows into the waste slurry pipe from the main bypass pipe. The fork body is below the waste slurry liquid level in the main bypass pipe to achieve accurate monitoring of the density of the waste slurry in the waste slurry pipe by the third tuning fork resonance type density meter.

[0015] Further, the data acquisition device is wired-connected to the signal output ends of the first liquid level sensor, the second liquid level sensor, the first flowmeter, the second flowmeter, the first tuning fork resonance type density meter, the second tuning fork resonance type density meter and the third tuning fork resonance type density meter; the data acquisition device is wirelessly connected to the data base station by LoRa, and the data base station is wirelessly connected to the slurry monitoring platform by LoRa.

[0016] On the other hand, the present invention also proposes a method for monitoring waste slurry in a large-diameter slurry shield tunnel, which is applicable to the above-mentioned large-diameter slurry shield tunnel waste slurry monitoring system, and includes the following steps:

[0017] S1. Select the measuring point positions, install the data acquisition module, the data base station and the slurry monitoring platform, and preset the monitoring frequency of the data acquisition module;

[0018] S2. Before the shield machine starts tunneling, the data acquisition module collects data at a set frequency and sends the collected data to the data base station via LoRa wireless communication. The data base station then sends the data to the mud monitoring platform via LoRa wireless communication.

[0019] S3. The mud monitoring platform analyzes, processes, and stores the data, and displays the relationship curve between the monitored data and the waste mud production over time.

[0020] Further, step S3 includes:

[0021] S31. The mud monitoring platform calculates the initial mud mass m c0 of the sedimentation tank and the initial mud mass m t0 of the slurry mixing tank. The calculation method is:

[0022] m c0 = ρ c0 h c0 S c

[0023] m t0 = ρ t0 h t0 S t

[0024] where h c0 is the initial liquid level of the sedimentation tank, h t0 is the initial liquid level of the slurry mixing tank, ρ c0 is the initial mud density of the sedimentation tank; ρ t0 is the initial mud density of the slurry mixing tank, S c is the bottom area of the sedimentation tank, and S t is the bottom area of the slurry mixing tank.

[0025] S32. The mud monitoring platform calculates the mass m i-1 of the mud discharged from the waste mud pipe at the t i -th and t s,i-1 -th moments, and the cumulative flow rate q s,i and q i-1 of the waste mud at the t i -th and t s,i-1 -th moments, and calculates the mass m s,i of the mud discharged from the waste mud pipe from the t i-1 -th moment to the t i -th moment. The calculation method is: s,i

[0026]

[0027] where i ≥ 1;

[0028] ​At the nth moment, the mass M of the slurry accumulated in the waste slurry pipe s,n is:

[0029]

[0030] S33. The slurry monitoring platform calculates the cumulative flow rate q of the clear water discharged from the clear water pipe at the t i-1 th moment and the t i th moment, and calculates the mass m of the clear water discharged from the clear water pipe from the t w,i-1 th moment to the t w,i th moment. The calculation method is: i-1 to the t i th moment. The calculation method is: w,i m

[0031] m w,i =ρ w (q w,i -q w,i-1 )

[0032] where ρ w is the density of clear water, ρ w =1t / m 3 , i≥1;

[0033] At the nth moment, the mass M of the clear water accumulated in the clear water pipe w,n is:

[0034]

[0035] S34. The slurry monitoring platform calculates the mass m of the slurry in the sedimentation tank and the initial mass m of the slurry in the slurry mixing tank at the nth moment according to the received liquid levels h c,n and h t,n of the sedimentation tank and the slurry mixing tank at the nth moment, and the slurry densities ρ c,n and ρ t,n of the sedimentation tank and the slurry mixing tank at the nth moment. The calculation methods are: c,n m t,n is:

[0036] m c,n =ρ c,n h c,n S c

[0037] m t,n =ρ t,n h t,n S t ;

[0038] S35. The slurry monitoring platform calculates the amount of waste slurry M z,n cumulatively generated by the shield at the nth moment, and displays the calculation result and the curve of the relationship between the data and time of the data acquisition module in real time. M z,nThe calculation method is as follows:

[0039]

[0040] Compared with the prior art, the advantages of the present invention are as follows:

[0041] By adopting a tuning fork resonance densitometer, an electromagnetic flowmeter and a liquid level sensor, the present invention respectively monitors the mud density and mud flow rate in the sedimentation tank, the slurry mixing tank and the waste slurry pipe, as well as the clear water density and clear water flow rate discharged from the clear water pipe, and can obtain the amount of waste slurry generated during the construction of a large-diameter slurry shield tunnel, the mud density in the sedimentation tank and the slurry mixing tank, and the liquid level value in real time and accurately. The data acquisition device, the data base station and the mud monitoring platform of the present invention are wirelessly connected by LoRa, and can realize ultra-long-distance data transmission and automatic monitoring.

[0042] The present invention effectively solves the problem that the output of shield waste slurry cannot be accurately monitored in the prior art, can automatically and accurately monitor the amount of waste slurry generated during the construction of a large-diameter slurry shield, and can also synchronously monitor the liquid level changes in the sedimentation tank and the slurry mixing tank. It can not only provide the slurry inlet and outlet parameters of the shield machine for the construction personnel during the tunnel construction period, but also provide a direct reference for the construction personnel to adjust the density of the sedimentation tank and the slurry mixing tank. In addition, it can also be used as the basis for setting the treatment frequency of the waste slurry treatment equipment for the post-equipment and the design basis for the treatment capacity of the waste slurry treatment equipment for the post-equipment. Description of the Drawings

[0043] Figure 1 is a schematic structural diagram of a waste slurry monitoring system for a large-diameter slurry shield tunnel in an embodiment of the present invention;

[0044] Figure 2 is a schematic structural diagram of a data acquisition module and a second slurry pump in an embodiment of the present invention;

[0045] Figure 3 is a schematic structural diagram of a third tuning fork resonance densitometer and a third mounting part of the densitometer in an embodiment of the present invention;

[0046] Figure 4 is a monitoring flow chart of a waste slurry monitoring system for a large-diameter slurry shield tunnel in an embodiment of the present invention.

[0047] In the figure: 1. Mud-water separation equipment; 2. Main slurry discharge pipe; 3. Slurry discharge pipe; 4. Settling pond; 4-1. Slurry storage tank of the settling pond; 4-2. Wall of the settling pond; 4-3. Slurry inlet channel; 5. Slurry adjusting pond; 5-1. Slurry storage tank of the slurry adjusting pond; 5-2. Wall of the slurry adjusting pond; 6. Clear water pipe; 7. First slurry pump; 8. Waste slurry pipe; 9. Second slurry pump; 9-1. Slurry pump body; 9-2. Three-way pipe; 9-3. First gate valve; 9-4. Second gate valve; 10. Main slurry inlet pipe; 11. Data acquisition module; 11-1. First liquid level sensor; 11-2. First installation part of the liquid level sensor; 11-3. Second liquid level sensor; 11-4. Second installation part of the liquid level sensor; 11-5. First flowmeter; 11-6. Second flowmeter; 11-7. First tuning fork resonance densitometer; 11-8. First installation part of the densitometer; 11-9. Second tuning fork resonance densitometer; 11-10. Second installation part of the densitometer; 11-11. Third tuning fork resonance densitometer; 11-111. Machine head; 11-112. Flange; 11-113. Connecting column; 11-114. Fork body; 11-12. Third installation part of the densitometer; 11-121. Main bypass pipe; 11-122. Small bypass pipe; 11-13. Data acquisition device; 12. Data base station; 13. Mud monitoring platform. Detailed implementation manners

[0048] To facilitate the understanding of the present invention by those skilled in the art, the following describes the detailed implementation manners of the present invention with reference to the accompanying drawings.

[0049] Embodiment 1

[0050] As Figures 1 to 3 shown, the present invention provides a monitoring system for waste slurry in a large-diameter slurry shield tunnel, including a mud-water separation equipment 1, a main slurry discharge pipe 2, a slurry discharge pipe 3, a settling pond 4, a slurry adjusting pond 5, a clear water pipe 6, a first slurry pump 7, a waste slurry pipe 8, a second slurry pump 9, a main slurry inlet pipe 10, a data acquisition module 11, a data base station 12 and a mud monitoring platform 13.

[0051] The main slurry discharge pipe 2 is used to connect the mud-water separation equipment 1 and the shield machine. One end of the slurry discharge pipe 3 is connected to the mud-water separation equipment 1, and the other end discharges the screened slurry into the settling pond 4.

[0052] The settling pond 4 includes a slurry storage tank 4-1 of the settling pond, a wall 4-2 of the settling pond and a slurry inlet channel 4-3. The slurry inlet channel 4-3 is connected to the slurry adjusting pond 5, and the slurry adjusting pond 5 includes a slurry storage tank 5-1 of the slurry adjusting pond and a wall 5-2 of the slurry adjusting pond. In this embodiment, the wall 4-2 of the settling pond and the wall 5-2 of the slurry adjusting pond are the same wall.

[0053] One end of the first slurry pump 7 is connected to the slurry adjusting pond 5, and the other end is connected to the main slurry inlet pipe 10 and pumps the slurry to the shield excavation face.

[0054] The second mud pump 9 includes a mud pump body 9-1, a three-way pipe 9-2, a first gate valve 9-3 and a second gate valve 9-4. One end of the mud pump body 9-1 is connected to the main pipe of the three-way pipe 9-2, and the other end is connected to the waste slurry pipe 8. The other end of the waste slurry pipe 8 is connected to the subsequent mud and water treatment system. The two branch pipes of the three-way pipe 9-2 are connected to the sedimentation tank 4 and the slurry adjustment tank 5 respectively. The first gate valve 9-3 and the second gate valve 9-4 are used to selectively control the connectivity of the two branch pipes.

[0055] The clean water pipe 6 is used to adjust the slurry density by conveying clean water to the sedimentation tank 4 .

[0056] The data acquisition module 11 includes a first liquid level sensor 11-1, a first mounting part 11-2 of the liquid level sensor, a second liquid level sensor 11-3, a second mounting part 11-4 of the liquid level sensor, a first flow meter 11-5, a second flow meter 11-6, a first tuning fork resonant densitometer 11-7, a first mounting part 11-8 of a densitometer, a second tuning fork resonant densitometer 11-9, a second mounting part 11-10 of a densitometer, a third tuning fork resonant densitometer 11-11, a third mounting part 11-12 of a densitometer and a data acquisition device 11-13.

[0057] The data acquisition device 11-13 is wiredly connected to the signal output ends of the first liquid level sensor 11-1, the second liquid level sensor 11-3, the first flow meter 11-5, the second flow meter 11-6, the first tuning fork resonant density meter 11-7, the second tuning fork resonant density meter 11-9 and the third tuning fork resonant density meter 11-11, and is used to receive and collect data and serve as a power supply for the data acquisition module 11.

[0058] In this embodiment, the first flow meter 11-5 and the second flow meter 11-6 are both electromagnetic flow meters.

[0059] Among the existing wireless communication technologies, LoRa wireless communication technology has the advantages of long-distance communication, low power consumption, and strong anti-interference ability. In this patent, the data acquisition devices 11-13 are wirelessly connected to the data base station 12 via LoRa, and the data base station 12 is wirelessly connected to the mud monitoring platform 13 via LoRa.

[0060] One end of the first mounting part 11-2 of the liquid level sensor is fixed to the top of the sedimentation tank wall 4-2 by bolts, and the other end extends to the top of the sedimentation tank slurry storage tank 4-1 and is provided with a bolt hole. One end of the second mounting part 11-4 of the liquid level sensor is fixed to the top of the slurry mixing tank wall 5-2 by bolts, and the other end extends to the top of the slurry mixing tank slurry storage tank 5-1 and is provided with a bolt hole. The first liquid level sensor 11-1 and the second liquid level sensor 11-3 are threadedly connected to the first mounting part 11-2 of the liquid level sensor and the second mounting part 11-4 of the liquid level sensor, respectively.

[0061] The first flowmeter 11-5 and the second flowmeter 11-6 are respectively installed in the horizontal sections of the slurry discharge pipe 3 and the clear water pipe 6, and are used to monitor the slurry flow in the slurry discharge pipe 3 and the clear water flow in the clear water pipe 6 in sequence.

[0062] One end of the first installation part 11-8 of the densitometer is fixed to the top of the sedimentation tank wall 4-2 by bolts, and the other end extends above the slurry storage tank 4-1 of the sedimentation tank and is provided with bolt holes. The first tuning fork resonant densitometer 11-7 is used to monitor the slurry density in the sedimentation tank 4 and is connected to the first installation part 11-8 of the densitometer by bolts. The bottom of the first tuning fork resonant densitometer 11-7 is located below the slurry liquid level in the sedimentation tank 4.

[0063] One end of the second installation part 11-10 of the densitometer is fixed to the top of the slurry mixing tank wall 5-2 by bolts, and the other end extends above the slurry storage tank 5-1 of the slurry mixing tank and is provided with bolt holes. The second tuning fork resonant densitometer 11-9 is used to monitor the slurry density in the slurry mixing tank 5 and is connected to the second installation part 11-10 of the densitometer by bolts. The bottom of the second tuning fork resonant densitometer 11-9 is located below the slurry liquid level in the slurry mixing tank 5.

[0064] The third installation part 11-12 of the densitometer includes a main bypass pipe 11-121 and a small bypass pipe 11-122. The head of the main bypass pipe 11-121 is connected to the waste slurry pipe 8, the head of the small bypass pipe 11-122 is connected to the waste slurry pipe 8, the tail of the small bypass pipe 11-122 is vertically connected to the main bypass pipe 11-121, and the tail of the main bypass pipe 11-121 is connected to the third tuning fork resonant densitometer 11-11 by a flange. The third tuning fork resonant densitometer 11-11 includes a machine head 11-111, a flange plate 11-112, a connecting column 11-113, and a fork body 11-114 from top to bottom (see Figure 3 ), the third installation part 11-12 of the densitometer is arranged in the horizontal section of the waste slurry pipe 8. Under the action of the second slurry pump 9, part of the waste slurry in the waste slurry pipe 8 first enters the main bypass pipe 11-121 through the small bypass pipe 11-122. After the waste slurry contacts the fork body 11-114, it then flows into the waste slurry pipe 8 from the main bypass pipe 11-121. The fork body 11-114 is located below the waste slurry liquid level in the main bypass pipe 11-121 to achieve accurate monitoring of the waste slurry density in the waste slurry pipe 8 by the third tuning fork resonant densitometer 11-11.

[0065] The slurry monitoring platform 13 is used to analyze, process, and store data, form curves of the relationship between the waste slurry production and time, the relationship between the sedimentation tank slurry density and time, the relationship between the slurry mixing tank slurry density and time, the relationship between the sedimentation tank liquid level and time, and the relationship between the slurry mixing tank liquid level and time, and query the data of the data acquisition module 11 in real time.

[0066] Example 2

[0067] As Figure 4 shown, the monitoring function of the slurry production monitoring system for large-diameter slurry shield tunnels for the waste slurry production is realized by the following method:

[0068] Step 1: Select the measuring point positions, install the data acquisition module 11, the data base station 12 and the slurry monitoring platform 13, and preset the monitoring frequency of the data acquisition module 11;

[0069] Step 2: Before the shield machine tunnels, the data acquisition module 11 collects data according to the set frequency, and sends the collected data to the data base station 12 through LoRa wireless communication, and the data base station 12 sends the data to the slurry monitoring platform 13 through LoRa wireless communication;

[0070] Step 3: The slurry monitoring platform 13 calculates the initial slurry mass m c0 of the sedimentation tank 4 and the initial slurry mass m t0 of the slurry mixing tank 5, and the calculation method is:

[0071] m c0 =ρ c0 h c0 S c

[0072] m t0 =ρ t0 h t0 S t

[0073] where h c0 is the initial liquid level of the sedimentation tank, h t0 is the initial liquid level of the slurry mixing tank, ρ c0 is the initial slurry density of the sedimentation tank, ρ t0 is the initial slurry density of the slurry mixing tank, S c is the bottom area of the sedimentation tank, S t is the bottom area of the slurry mixing tank;

[0074] Step 4: The slurry monitoring platform 13 calculates the slurry mass m i-1 discharged from the waste slurry pipe 8 at the t i th moment and the t s,i-1 th moment according to the received slurry densities ρ s,i and ρ i-1 at the t i th moment and the t s,i-1 th moment, and the cumulative waste slurry flow rates q s,i and q i-1 from the t i th moment to the t s,i th moment, and the calculation method is:

[0075]

[0076] where \(i\geq1\);

[0077] At the \(n\)th moment, the mass \(M\) of the slurry accumulated and discharged through the waste slurry pipe 8 s,n is:

[0078]

[0079] Step Five: The slurry monitoring platform 13 calculates the mass \(m\) of the clear water discharged through the clear water pipe 6 from the \(t\)th i-1 moment to the \(t\)th i moment based on the cumulative flow rates \(q\) w,i-1 and \(q\) w,i of the clear water discharged through the clear water pipe 6 received at the \(t\)th i-1 moment and the \(t\)th i moment. The calculation method is: w,i is:

[0080] \(m\) w,i =\(\rho\) w \((q\) w,i -\(q\) w,i-1 )

[0081] where \(\rho\) w is the density of clear water, \(\rho\) w = 1 t / m 3 , \(i\geq1\);

[0082] At the \(n\)th moment, the mass \(M\) of the clear water accumulated and discharged through the clear water pipe 6 w,n is:

[0083]

[0084] Step Six: The slurry monitoring platform 13 calculates the mass \(m\) of the slurry in the sedimentation tank 4 and the initial mass \(m\) c,n of the slurry in the slurry mixing tank 5 at the \(n\)th moment based on the liquid levels \(h\) t,n and \(h\) c,n of the sedimentation tank 4 and the slurry mixing tank 5, and the slurry densities \(\rho\) t,n and \(\rho\) c,n received at the \(n\)th moment. The calculation method is: t,n is:

[0085] \(m\) c,n =\(\rho\) c,n \(h\) c,n \(S\) c

[0086] \(m\) t,n =\(\rho\) t,n \(h\) t,n \(S\) t ;

[0087] Step 7: The mud monitoring platform 13 calculates the cumulative amount of waste mud M generated by the shield at the nth moment z,n , and displays in real time the curve graphs of the relationship between the waste mud production and time, the relationship between the mud density in the sedimentation tank and time, the relationship between the mud density in the slurry mixing tank and time, the relationship between the liquid level in the sedimentation tank and time, and the relationship between the liquid level in the slurry mixing tank and time. The calculation method of M z,n is as follows:

[0088]

[0089] The curve graph of the relationship between the waste mud production and time displayed by the mud monitoring platform 13 in real time enables the construction personnel to determine the waste mud production in a timely manner, so as to adjust the waste mud treatment frequency; the curve graphs of the relationship between the mud density in the sedimentation tank 4 and time and the relationship between the mud density in the slurry mixing tank 5 and time displayed by the mud monitoring platform 13 in real time enable the construction personnel to confirm whether the mud density in the sedimentation tank 4 and the slurry mixing tank 5 is maintained within the normal range, which can not only prevent the mud density in the sedimentation tank 4 and the slurry mixing tank 5 from being too low to effectively carry the slag of the slurry transported to the excavation face of the shield machine, but also prevent the mud density in the sedimentation tank 4 and the slurry mixing tank 5 from being too high, resulting in poor slurry pumping efficiency and thus affecting the construction efficiency; the liquid levels of the sedimentation tank 4 and the slurry mixing tank 5 displayed by the mud monitoring platform 13 in real time can help the construction personnel avoid the overflow of the waste mud in the sedimentation tank 4 and the slurry mixing tank 5.

[0090] The above-described embodiments of the present invention do not constitute a limitation on the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A monitoring system for abandoned slurry in a large-diameter slurry shield tunnel, characterized in that, It includes a main slurry discharge pipe (2), a mud-water separation device (1), a slurry discharge pipe (3), a sedimentation tank (4), a slurry adjustment tank (5), a clear water pipe (6), a first slurry pump (7), a waste slurry pipe (8), a second slurry pump (9), a main slurry inlet pipe (10), a data acquisition module (11), a data base station (12) and a slurry monitoring platform (13); The main slurry discharge pipe (2) is used to connect the mud-water separation device (1) with the shield machine; one end of the slurry discharge pipe (3) is connected to the mud-water separation device (1), and the other end discharges the screened slurry into the sedimentation tank (4). The sedimentation tank (4) includes a slurry storage tank of the sedimentation tank (4), a wall of the sedimentation tank (4) and a slurry inlet passage (4-3). The slurry inlet passage (4-3) is connected to the slurry adjustment tank (5). The slurry adjustment tank (5) includes a slurry storage tank of the slurry adjustment tank (5-1) and a wall of the slurry adjustment tank (5-2). One end of the first slurry pump (7) is connected to the slurry adjustment tank (5), and the other end is connected to the main slurry inlet pipe (10). The second slurry pump (9) includes a slurry pump body (9-1), a tee pipe (9-2), a first gate valve (9-3) and a second gate valve (9-4). One end of the slurry pump body (9-1) is connected to the main pipe of the tee pipe (9-2), and the other end is connected to the waste slurry pipe (8). The two branch pipes of the tee pipe (9-2) are respectively connected to the slurry adjustment tank (5) and the sedimentation tank (4); the clear water pipe (6) is used to convey clear water to the sedimentation tank (4); The data acquisition module (11) includes a first liquid level sensor (11-1) for monitoring the liquid level of the sedimentation tank (4), a second liquid level sensor (11-3) for monitoring the liquid level of the slurry adjustment tank (5), a first flowmeter (11-5) for monitoring the flow rate of the waste slurry pipe (8), a second flowmeter (11-6) for monitoring the flow rate of the clear water pipe (6), a first tuning fork resonance type densitometer (11-7) for monitoring the density of the slurry in the sedimentation tank (4), a second tuning fork resonance type densitometer (11-9) for monitoring the density of the slurry in the slurry adjustment tank (5), a third tuning fork resonance type densitometer (11-11) for monitoring the density of the waste slurry in the waste slurry pipe (8) and a data acquisition device (11-13). The data acquisition device (11-13) is electrically connected to the first liquid level sensor (11-1), the second liquid level sensor (11-3), the first flowmeter (11-5), the second flowmeter (11-6), the first tuning fork resonance type densitometer (11-7), the second tuning fork resonance type densitometer (11-9) and the third tuning fork resonance type densitometer (11-11); The data acquisition device (11-13) is wirelessly connected to the data base station (12), and the data base station (12) is wirelessly connected to the slurry monitoring platform (13); The slurry monitoring platform (13) is used for analyzing, processing and storing data, and for querying the data of the data acquisition module (11) in real time; The first tuning fork resonant densitometer (11-7) is installed on the first densitometer mounting part (11-8). One end of the first densitometer mounting part (11-8) is fixed to the top of the wall of the sedimentation tank (4) by bolts, and the other end extends above the slurry storage tank of the sedimentation tank (4) to install the first tuning fork resonant densitometer (11-7). The bottom of the first tuning fork resonant densitometer (11-7) is located below the slurry liquid level in the sedimentation tank (4); The second tuning fork resonant densitometer (11-9) is installed on the second densitometer mounting part (11-10). One end of the second densitometer mounting part (11-10) is fixed to the top of the wall of the slurry mixing tank (5-2) by bolts, and the other end extends above the slurry storage tank (5-1) of the slurry mixing tank to install the second tuning fork resonant densitometer (11-9). The bottom of the second tuning fork resonant densitometer (11-9) is located below the slurry liquid level in the slurry mixing tank (5). The third tuning fork resonant densitometer (11-11) is installed on the third densitometer mounting part (11-12). The third densitometer mounting part (11-12) includes a main bypass pipe (11-121) and a small bypass pipe (11-122). The head of the main bypass pipe (11-121) is connected to the waste slurry pipe (8), the head of the small bypass pipe (11-122) is connected to the waste slurry pipe (8), the tail of the small bypass pipe (11-122) is vertically connected to the main bypass pipe (11-121), and the tail of the main bypass pipe (11-121) is flange-connected to the third tuning fork resonant densitometer (11-11); The third tuning fork resonant densitometer (11-11) successively includes a machine head (11-111), a flange plate (11-112), a connecting column (11-113) and a fork body (11-114). The third densitometer mounting part (11-12) is installed on the horizontal section of the waste slurry pipe (8). Under the action of the second slurry pump (9), part of the waste slurry in the waste slurry pipe (8) first enters the main bypass pipe (11-121) through the small bypass pipe (11-122). After the waste slurry contacts the fork body (11-114), it then flows into the waste slurry pipe (8) from the main bypass pipe (11-121). The fork body (11-114) is located below the waste slurry liquid level in the main bypass pipe (11-121).

2. The monitoring system for abandoned slurry in a large-diameter slurry shield tunnel according to claim 1, wherein The first liquid level sensor (11-1) is installed on the first liquid level sensor mounting part (11-2). One end of the first liquid level sensor mounting part (11-2) is fixed to the top of the wall of the sedimentation tank (4) by bolts, and the other end extends above the slurry storage tank of the sedimentation tank (4) to install the first liquid level sensor (11-1); The second liquid level sensor (11-3) is installed on the second liquid level sensor mounting part (11-4). One end of the second liquid level sensor mounting part (11-4) is fixed to the top of the wall of the slurry mixing tank (5-2) by bolts, and the other end extends above the slurry storage tank (5-1) of the slurry mixing tank to install the second liquid level sensor (11-3).

3. The large-diameter slurry shield tunnel waste mud monitoring system according to claim 1, characterized in that, The first flowmeter (11-5) and the second flowmeter (11-6) are respectively installed in the horizontal sections of the waste slurry pipe (8) and the clean water pipe (6).

4. The large-diameter slurry shield tunnel waste slurry monitoring system according to claim 1, characterized in that, The data acquisition device (11-13) is wired-connected to the signal output ends of the first liquid level sensor (11-1), the second liquid level sensor (11-3), the first flowmeter (11-5), the second flowmeter (11-6), the first tuning fork resonance type density meter (11-7), the second tuning fork resonance type density meter (11-9), and the third tuning fork resonance type density meter (11-11); the data acquisition device (11-13) is wirelessly connected to the data base station (12) by means of LoRa, and the data base station (12) is wirelessly connected to the mud monitoring platform (13) by means of LoRa.

5. A monitoring method for waste slurry of a large-diameter slurry shield tunnel, applicable to the waste slurry monitoring system of the large-diameter slurry shield tunnel as described in Claim 1, characterized in that, It includes the following steps: S1. Select the measuring point positions, install the data acquisition module (11), the data base station (12), and the mud monitoring platform (13), and preset the monitoring frequency of the data acquisition module (11); S2. Before the shield machine tunnels, the data acquisition module (11) acquires data according to the set frequency, and sends the acquired data to the data base station (12) by means of wireless communication, and the data base station (12) sends the data to the mud monitoring platform (13) by means of wireless communication; S3. The mud monitoring platform (13) analyzes, processes, and stores the data, and displays the monitoring data and the relationship curve graph of the waste mud production and time; Step S3 includes: S31. The mud monitoring platform (13) calculates the initial mud mass m of the sedimentation tank (4) according to the received data c0 and the initial mud mass m of the slurry mixing tank (5), t0 and the calculation method is as follows: ； ； Among them, h c0 is the initial liquid level of the sedimentation tank (4), h t0 is the initial liquid level of the pulp mixing tank (5), ρ c0 is the initial mud density of the sedimentation tank (4); ρ t0 is the initial mud density of the pulp mixing tank (5), S c is the bottom area of the sedimentation tank (4), S t is the bottom area of the pulp mixing tank (5); S32. The mud monitoring platform (13) calculates the mass m of the mud discharged from the waste mud pipe (8) from the t-th moment to the t-th moment according to the mud density ρ and ρ discharged from the waste mud pipe (8) at the t-th moment and the t-th moment, and the cumulative flow rate q and q of the waste mud at the t-th moment and the t-th moment. The calculation method is as follows: i-1 At the t-th i moment and the t-th s,i-1 moment, the mud density ρ s,i and ρ i-1 discharged from the waste mud pipe (8), and at the t-th i moment and the t-th s,i-1 moment, the cumulative flow rate q s,i and q i-1 of the waste mud. Calculate the mass m of the mud discharged from the waste mud pipe (8) from the t-th i moment to the t-th s,i moment. The calculation method is: ； wherein, i≥1; At the nth moment, the mass M of the slurry cumulatively discharged through the waste slurry pipe (8) s,n is as follows: ； S33. The mud monitoring platform (13) calculates the mass m of the clear water discharged from the clear water pipe (6) from the t-th moment to the t-th moment according to the cumulative clear water flow rates q and q received at the t-th moment and the t-th moment. The calculation method is as follows: i-1 At the t-th moment i and the cumulative clear water flow rate q of the clear water discharged from the clear water pipe (6) at the t-th moment w,i-1 and q w,i to calculate the mass m of the clear water discharged from the clear water pipe (6) from the t-th moment to the t-th moment i-1 The calculation method is as follows: i At the t-th moment w,i The calculation method is as follows: ； Among them, ρ w is the density of clear water, ρ w = 1 t / m 3 , i ≥ 1; At the nth moment, the mass M of clear water cumulatively discharged from the clear water pipe (6) w,n is as follows: ； S34. The mud monitoring platform (13) calculates, based on the liquid levels h c,n and h t,n of the sedimentation tank (4) and the slurry mixing tank (5) received at the nth moment, and the mud densities ρ c,n and ρ t,n of the sedimentation tank (4) and the slurry mixing tank (5) at the nth moment, the mud mass m c,n of the sedimentation tank (4) and the initial mud mass m t,n of the slurry mixing tank (5) at the nth moment. The calculation method is as follows: ； ； S35. The mud monitoring platform (13) calculates the cumulative amount of waste mud M generated by the shield at the nth moment z,n , and displays the calculation result and the curve graph of the relationship between the data of the data acquisition module (11) and time in real time. The calculation method of M z,n is as follows: 。 6. The monitoring method for abandoned slurry of large-diameter slurry shield tunnel according to claim 5, characterized in that The wireless communication method in step S2 is the LoRa wireless communication method.

Images