Combined metering method and system for slag discharge amount of slurry shield tunneling machine

Abstract

The invention relates to a combined metering method and system for the slag discharge amount of a slurry shield tunneling machine. The method comprises the steps that the slurry change amount in a slurry tank before and after each segment of the slurry shield tunneling machine is tunneled is measured; the muck variation of the muck field in the whole tunneling process of the slurry shield tunneling machine is measured; comprehensively calculating the slag tapping quantity of the real square; calculating an actual check volume according to the specification of the slurry shield tunneling machine; the flow and density of the slurry pipeline in the whole tunneling process are measured in real time, and the real-square deslagging check quantity is calculated; and calculating a first deviation value between the real square check volume and the real square slag discharge quantity, calculating a second deviation value between the real square slag discharge check quantity and the real square slag discharge quantity, and checking the real square slag discharge quantity by judging the first deviation value and the second deviation value. According to the method, a plurality of data sources are integrated, the actual volume deslagging quantity generated in the tunneling process of each ring of duct piece of the slurry shield tunneling machine is calculated more accurately, the actual volume checking volume and the actual volume deslagging checking quantity are used for checking, and the reliability of a measurement result is improved.

Description

Technical Field

[0001] The invention relates to the technical field of construction engineering, and in particular to a combined metering method and system for the slag discharge of a slurry shield machine. Background Art

[0002] The slurry shield machine is a highly integrated special equipment for tunnel construction, which is widely used in the construction of underground projects such as urban subways, railway tunnels, and highway tunnels. The working principle of the slurry shield machine is to inject high-pressure mud (usually bentonite mud) in front of the excavation face to fill the excavation chamber with mud, thereby balancing the external water and soil pressure and ensuring safety and stability during construction. The slurry shield machine is particularly suitable for strata with high groundwater levels and complex geological conditions, such as the highly permeable strata in the southeast coastal areas. These areas have abundant groundwater and large strata changes, and traditional shield machines are difficult to deal with effectively.

[0003] Although slurry shield machines have performed well in tunnel construction, they still face some challenges in practical applications. Since slurry shield machines use circulating slurry to carry away the soil produced by the cutter head excavation, the slurry in the pipeline is mainly uneven slag cut by the face, groundwater and injected slurry mixture. It is impossible to accurately determine the amount of slag discharged each time. If too much slag is discharged during excavation, the top of the tunnel will be emptied, which will gradually cause the ground to sink and deform, and in severe cases, collapse, building damage and other serious consequences; if the amount of slag discharged is insufficient, it may lead to insufficient excavation radius, mud cakes, necking and other phenomena, affecting the normal excavation of the shield machine.

[0004] In order to solve the above problems, some people have proposed solutions, such as a slurry shield slag metering system and method disclosed in patent publication number CN114252140A. The system includes a slag box, a slag height sensor, a counter and a control system. The counter is used to count the slag discharge instructions, and the gate is opened and closed in response to the slag discharge instructions to discharge the preset volume of slag in the slag box. According to the counting result of the slag discharge instruction and the preset slag discharge volume of the slag, the slag discharged from the slurry separation system is measured. This technical solution only measures the slag discharge of the slag box, and the metering method is single; and the control requirements for opening and closing the gate and slag discharge are relatively high. For example, the response time of the gate will affect the accuracy of slag discharge. If the response time is too long, it may cause slag accumulation or incomplete discharge; the sealing of the gate directly affects the discharge effect of the slag. If the sealing is not good, it will cause slag leakage and affect the measurement accuracy. Finally, this technical solution also lacks verification of the measurement results, and the reliability of the detection results is insufficient.

[0005] Therefore, it is necessary to develop an accurate and reliable method for measuring slag discharge of slurry shield machines. Summary of the invention

[0006] In order to overcome the shortcomings of the existing technology, the present invention provides a combined metering method and system for the slag discharge of a slurry shield machine, which ensures ground safety during the excavation process by accurately counting the amount of slag generated during the excavation construction of the slurry shield machine.

[0007] The technical solution of the present invention is as follows:

[0008] A combined metering method for the slag discharge amount of a slurry shield machine comprises: measuring the change in the slurry in the slurry tank before and after each ring of segments of the slurry shield machine is excavated; measuring the change in the slag in the slag yard during the whole excavation process of the slurry shield machine; calculating the actual slag discharge amount by combining the two change amounts; calculating the actual slag check volume according to the specifications of the slurry shield machine; measuring the flow rate and density of the slurry pipeline in real time during the whole excavation process to calculate the actual slag check amount; calculating a first deviation between the actual slag check volume and the actual slag discharge amount, calculating a second deviation between the actual slag check amount and the actual slag discharge amount, and verifying the actual slag discharge amount by judging the first deviation and the second deviation.

[0009] As a preferred technical solution of the present invention, the measurement of the change in the mud in the mud tank before and after each ring segment of the slurry shield machine is excavated specifically comprises the following steps:

[0010] Step 101: Before excavation, use a first densitometer to measure the initial density of the mud in the mud tank; use a liquid level ruler to measure the initial liquid level of the mud in the mud tank;

[0011] Step 102: After the excavation cycle is completed, wait for the mud level in the mud tank to stabilize;

[0012] Step 103: using a first densitometer to measure the final density of the mud in the mud tank; using a liquid level ruler to measure the final liquid level height of the mud in the mud tank;

[0013] Step 104, calculate the change in the mud in the mud tank before and after each ring of segments is excavated, and the calculation formula is:

[0014] Mud change = (end liquid level × end density - initial liquid level × initial density) × π × square of the mud tank radius.

[0015] As a preferred technical solution of the present invention, the measurement of the change amount of the slag in the slag field during the whole excavation process of the slurry shield machine specifically includes the following steps:

[0016] Step 201: Before excavation, use a 3D industrial laser scanner to scan the landfill to obtain an initial landfill volume;

[0017] Step 202: After excavation, use a 3D industrial laser scanner to scan the landfill to obtain the final landfill volume;

[0018] Step 203, using the ground slag loose coefficient measuring box to measure the loose coefficient of the slag discharged from the slag field;

[0019] Step 204, calculate the change amount of the slag in the slag field during the whole excavation process, the calculation formula is:

[0020] The change in the landfill volume = (final landfill volume - initial landfill volume) ÷ loose coefficient.

[0021] As a preferred technical solution of the present invention, the step of calculating the actual slag discharge volume by integrating the two changes is:

[0022] Step 3: Sum the change in the mud in the mud tank and the change in the slag in the landfill, and calculate the formula: actual slag output = change in mud + change in the slag in the landfill.

[0023] As a preferred technical solution of the present invention, the actual square verification volume is calculated according to the specifications of the slurry shield machine, specifically comprising the following steps:

[0024] Step 401, obtaining parameters of a slurry shield machine, including a shield excavation diameter and a segment width;

[0025] Step 402, calculate the actual square verification volume, the calculation formula is:

[0026] Actual verification volume = (π×square of shield excavation diameter×segment width) ÷ 4.

[0027] As a preferred technical solution of the present invention, the real-time measurement of the flow rate and density of the mud pipeline during the whole excavation process and the calculation of the actual slag verification amount specifically include the following steps:

[0028] Step 501: During the whole excavation process, at the inlet of the mud pipeline, a flow meter is used to periodically measure the inlet flow rate of the mud, and a second density meter is used to periodically measure the inlet density of the mud; at the outlet of the mud pipeline, a flow meter is used to periodically measure the outlet flow rate of the mud, and a second density meter is used to periodically measure the outlet density of the mud;

[0029] Step 502: at each cycle end point, record the excavation distance and measure the specific gravity of the surrounding rock;

[0030] Step 503, calculating the amount of slag discharged through the slurry pipeline after traveling a certain excavation distance in a single cycle, the calculation formula is: the amount of slag in a single cycle = excavation distance × (inlet slurry flow × inlet slurry density - outlet slurry flow × outlet slurry density);

[0031] Step 504, calculate the actual slag check volume, the calculation formula is:

[0032] The actual slag verification amount = (the amount of slag in the first cycle + the amount of slag in the second cycle + ... + the amount of slag in the nth cycle) ÷ the average value of the surrounding rock density, where n is a natural number.

[0033] As a preferred technical solution of the present invention, the first deviation between the actual cubic verification volume and the actual cubic slag discharge volume is calculated using the calculation formula:

[0034] The first deviation amount = | (actual cubic slag volume / actual cubic verification volume) - 1 |;

[0035] The second deviation between the actual cubic slag discharge verification amount and the actual cubic slag discharge amount is calculated using the calculation formula:

[0036] The second deviation amount = ︱(actual cubic slag discharge amount / actual cubic slag discharge verification amount)-1︱.

[0037] As a preferred technical solution of the present invention, the actual slag discharge amount is verified by judging the first deviation and the second deviation, which specifically includes the following judging steps:

[0038] If the first deviation is less than or equal to 5%, it is determined that the actual slag discharge volume meets the theoretical value and the construction is normal;

[0039] If the first deviation is greater than 5%, compare the actual slag discharge volume with the actual volume verification volume. When the actual slag discharge volume is greater than the actual volume verification volume, it means that too much slag is discharged during the excavation process, and it is necessary to check whether there is over-excavation; when the actual slag discharge volume is less than the actual volume verification volume, it means that insufficient slag is discharged during the excavation process, and it is necessary to check whether there is insufficient excavation radius or mud cake phenomenon;

[0040] If the second deviation is less than or equal to 10%, it is considered that the actual slag discharge volume is close to the actual slag discharge verification volume, and the measurement result of the actual slag discharge volume is credible; if the second deviation is greater than 10%, maintenance work is performed.

[0041] Furthermore, the maintenance work includes the following steps: check whether there are errors in the flow meter or density meter, and calibrate or replace them in time; check whether there are problems with the control system, and check, repair and update them in time; check whether the geological conditions have changed, and adjust the excavation parameters in time according to the latest geological conditions.

[0042] The present invention also provides a combined statistical system for the slag discharge amount of a slurry shield machine, which is used to implement the combined metering method for the slag discharge amount of a slurry shield machine described in the above scheme, and includes a slurry tank monitoring module, a slag yard monitoring module, a slurry pipeline monitoring module, and a data processing module;

[0043] The mud tank monitoring module includes a first densitometer and a liquid level scale, wherein the first densitometer is used to measure the density change of the mud in the mud tank before and after the slurry shield machine is excavated, and the liquid level scale is used to measure the initial liquid level height change of the mud in the mud tank before and after the slurry shield machine is excavated;

[0044] The landfill monitoring module includes a 3D industrial laser scanner and a ground slag loose coefficient determination box. The 3D industrial laser scanner is used to measure the volume change of the slag in the landfill before and after the slurry shield machine is excavated; the ground slag loose coefficient determination box is used to measure the loose coefficient of the slag discharged from the landfill;

[0045] The mud pipeline monitoring module includes a flow meter and a second density meter, the two flow meters are used to measure the inlet flow rate of the slurry inlet pipeline and the outlet flow rate of the slurry outlet pipeline respectively, and the two second density meters are used to measure the inlet density of the slurry inlet pipeline and the outlet density of the slurry outlet pipeline respectively;

[0046] The data processing module is used to receive the data measured by the mud tank monitoring module, the slag yard monitoring module and the mud pipeline monitoring module, and perform calculations.

[0047] The present invention according to the above scheme has the following beneficial effects:

[0048] The present invention uses simple tools such as a density meter and a liquid level ruler, takes the amount of slag produced by each ring of the slurry shield machine as a basic unit, and measures and counts the change in the slurry in the slurry tank; at the same time, a 3D industrial laser scanner is used to measure the change in the slag field during the entire process of the slurry shield machine excavation, and multiple data sources are integrated to more accurately calculate the actual cubic slag produced during the excavation of each ring of the slurry shield machine;

[0049] The present invention calculates the actual volume verification volume according to the specifications of the slurry shield machine, and also measures the flow rate and density of the slurry pipeline during the whole excavation process to calculate the actual volume slag verification volume; the actual volume verification volume and the actual volume slag verification volume are used for verification, thereby improving the reliability of the measurement result;

[0050] The present invention can satisfy the needs of construction personnel to formulate targeted disposal plans in the first time when abnormal situations occur, thereby eliminating possible hidden dangers; and the present invention has low cost and high operability, and is suitable for large-scale promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 is a flow chart of the method of the present invention;

[0052] Figure 2 A schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0053] In order to better understand the purpose, technical scheme and technical effect of the present invention, the present invention is further explained in conjunction with the accompanying drawings and embodiments. It should be noted that similar numbers and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, it is stated that the embodiments described below are only used to explain the present invention and are not used to limit the present invention.

[0054] It should be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may also be a central element, and when an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time.

[0055] The indicated orientation or position relationship is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the application is usually placed when used, or the orientation or position relationship commonly understood by technical personnel in this field, or the orientation or position relationship in which the product of the application is usually placed when used. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0056] The terms "first" and "second" are only used for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0057] like Figure 1 As shown, a combined metering method for the slag discharge amount of a slurry shield machine comprises:

[0058] Step 1, measuring the change of mud in the mud tank before and after each ring segment of the slurry shield machine is excavated;

[0059] Step 2, measuring the change of the slag in the slag field during the whole process of the slurry shield machine excavation;

[0060] Step 3, calculating the actual slag discharge volume by combining the two changes obtained in step 1 and step 2;

[0061] Step 4: Calculate the actual volume and check the volume according to the specifications of the slurry shield machine;

[0062] Step 5: Real-time measurement of the flow rate and density of the mud pipeline during the whole excavation process, and calculation of the actual slag verification quantity;

[0063] Step 6, calculating a first deviation between the actual cubic verification volume and the actual cubic slag discharge volume, and calculating a second deviation between the actual cubic slag discharge verification volume and the actual cubic slag discharge volume;

[0064] Step 7: calibrate the square slag discharge amount by judging the first deviation amount and the second deviation amount.

[0065] It can be seen that the present invention uses simple tools such as a densitometer and a liquid level ruler, and takes the amount of slag produced by each ring of the slurry shield machine as the basic unit to measure and count the change in the mud in the mud tank; at the same time, a 3D industrial laser scanner is used to measure the change in the slag field during the entire process of the slurry shield machine excavation, and multiple data sources are integrated to more accurately calculate the actual cubic slag amount produced during the excavation of each ring of the slurry shield machine; the present invention calculates the actual cubic verification volume according to the specifications of the slurry shield machine, and also measures the flow rate and density of the mud pipeline during the entire excavation process to calculate the actual cubic slag verification amount; the actual cubic verification volume and the actual cubic slag verification amount are used for verification, thereby improving the reliability of the measurement result.

[0066] Among them, step 1, measuring the change of mud in the mud tank before and after each ring segment of the slurry shield machine is excavated, specifically includes the following steps:

[0067] Step 101: Before excavation, use a first densitometer to measure the initial density of the mud in the mud tank. b1 ; Use the liquid level ruler to measure the initial liquid level h of the mud in the mud tank b1 ;

[0068] Step 102: After the excavation cycle is completed, wait for the mud level in the mud tank to stabilize;

[0069] Step 103: Use the first densitometer to measure the final density ρ of the mud in the mud tank. b2 ; Use the liquid level ruler to measure the final liquid level height h of the mud in the mud tank b2 ;

[0070] Step 104, calculate the change Δ1 of the mud in the mud tank before and after each ring segment excavation, the calculation formula is:

[0071] Mud change = (end liquid level × end density - initial liquid level × initial density) × π × square of mud tank radius, that is, Δ1 = (h b2 ρ b2 -h b1 ρ b1 )πR 2 .

[0072] Step 2: measuring the change of the slag in the slag field during the whole process of the slurry shield machine excavation, specifically including the following steps:

[0073] Step 201: Before excavation, use a 3D industrial laser scanner to scan the landfill to obtain the initial landfill volume V c1 ;

[0074] Step 202: After excavation, use a 3D industrial laser scanner to scan the landfill to obtain the end landfill volume V c2 ;

[0075] Step 203: Use the ground soil looseness coefficient measuring box to measure the looseness coefficient K of the soil discharged from the soil dump. D ;

[0076] Step 204, calculate the change amount Δ2 of the slag in the slag field during the whole excavation process, the calculation formula is:

[0077] The change of the slag in the landfill = (the final slag volume - the initial slag volume) ÷ the loose coefficient,

[0078] That is, Δ2=(V c2- V c1 ) / K D .

[0079] Step 3: The steps of calculating the actual slag discharge volume V by combining the two changes obtained in step 1 and step 2 are as follows: summing the change of the mud in the mud tank and the change of the slag in the slag field, and the calculation formula is:

[0080] The actual slag discharge volume = the change in mud volume + the change in slag volume in the slag field.

[0081] That is, V = Δ 2+ Δ2=(h b2 ρ b2 -h b1 ρ b1 )πR 2 +(V c2 -V c1 ) / K D .

[0082] Step 4: Calculate the actual volume verification according to the specifications of the slurry shield machine, which specifically includes the following steps:

[0083] Step 401, obtaining parameters of a slurry shield machine, including a shield excavation diameter and a segment width;

[0084] Step 402, calculate the actual square verification volume, the calculation formula is:

[0085] The actual volume verification = (π×square of shield excavation diameter×segment width) ÷ 4, that is, V2 = πD 2 L / 4.

[0086] Step 5: Real-time measurement of the flow rate and density of the mud pipeline during the entire excavation process, and calculation of the actual slag verification quantity, specifically including the following steps:

[0087] Step 501: During the whole excavation process, at the inlet of the mud pipeline, a flow meter is used to periodically measure the mud inlet flow rate L 进A1 , L 进A2 , L 进A3 ...; Use the second density meter to periodically measure the mud feed density ρ 进A1 , 进A2 , 进A3 ……; At the outlet of the mud pipeline, use a flow meter to periodically measure the slurry flow rate L 出A1 , L 出A2 , L 出A3 ...; Use the second density meter to periodically measure the slurry density ρ of the slurry 出A1 , 出A2 , 出A3 ……;

[0088] Step 502: At each cycle end, record the excavation distance H1, H2, H3, ...; measure the specific gravity of the surrounding rock ρ 岩1 , 岩2 , 岩3 ……;

[0089] Step 503, calculating the amount of slag discharged through the slurry pipeline after traveling a certain excavation distance in a single cycle, the calculation formula is: the amount of slag in a single cycle = excavation distance × (inlet slurry flow × inlet slurry density - outlet slurry flow × outlet slurry density);

[0090] Step 504, calculate the actual slag check volume V1, the calculation formula is:

[0091] The actual slag verification amount = (the amount of slag in the first cycle + the amount of slag in the second cycle + ... + the amount of slag in the nth cycle) ÷ the average value of the surrounding rock specific gravity, where n is a natural number,

[0092] That is, V1=[H1(L 进A1 ρ 进A1 -L 出A1 ρ 出A1 )+H1(L 进A1 ρ 进A1 -L 出A1 ρ 出A1 )+……+Hn(L 进An ρ 进An -L 出An ρ 出An )] / [(ρ 岩1 +ρ 岩2 +……+ρ 岩n ) / n].

[0093] In step 6, the calculation formula of the first deviation between the actual cubic verification volume and the actual cubic slag discharge volume is:

[0094] The first deviation amount = ︱(actual cubic slag discharge volume / actual cubic verification volume)-1︱=︱(V / V2)-1︱%;

[0095] The calculation formula for the second deviation between the actual slag discharge verification amount and the actual slag discharge amount is:

[0096] The second deviation amount = ︱(actual cubic slag discharge amount / actual cubic slag discharge verification amount)-1︱=︱(V / V1)-1︱%.

[0097] Finally, step 7 is performed to calibrate the amount of slag discharge by judging the first deviation and the second deviation, which specifically includes the following judging steps:

[0098] Step 701: If the first deviation is less than or equal to 5%, that is, |(V / V2)-1|≤5%, it is determined that the actual slag discharge volume meets the theoretical value and the construction is normal;

[0099] Step 702: If the first deviation is greater than 5%, that is, |(V / V2)-1|>5%, compare the actual slag discharge volume with the actual verification volume. When the actual slag discharge volume is greater than the actual verification volume, too much slag is discharged during the excavation process, and it is necessary to check whether there is over-excavation; when the actual slag discharge volume is less than the actual verification volume, insufficient slag is discharged during the excavation process, and it is necessary to check whether there is insufficient excavation radius or mud cake phenomenon;

[0100] Step 703: If the second deviation is less than or equal to 10%, that is, |(V / V1)-1|≤10%, it is considered that the actual slag discharge amount is close to the actual slag discharge verification amount, and the measurement result of the actual slag discharge amount is credible;

[0101] Step 704, if the second deviation is greater than 10%, that is, |(V / V1)-1|>10%, then perform maintenance work; the maintenance work includes: checking whether there are errors in the flow meter or density meter, and calibrating or replacing them in time; checking whether there are problems with the control system, and checking, repairing and updating them in time; checking whether the geological conditions have changed, and adjusting the excavation parameters in time according to the latest geological conditions.

[0102] In addition, when the first deviation is greater than 5% and the second deviation is greater than 10%, in addition to performing maintenance work, it is also necessary to initiate measures such as increasing synchronous grouting, secondary grouting, ground geological radar scanning, and intensifying monitoring of surface subsidence; the monitoring data and scanning data are also used to determine whether to initiate emergency response. Emergency response measures include: immediately suspending shield machine excavation to ensure construction safety; taking ground reinforcement measures, such as increasing grouting volume, adjusting grouting parameters, etc.; reinforcing the surface, such as laying steel plates, pouring concrete, etc.; if necessary, evacuating personnel near the construction site to ensure personnel safety; activating emergency plans, organizing emergency rescue teams, and preparing emergency supplies; continuing to intensify monitoring of surface subsidence and geological structures to ensure continued monitoring after construction resumes normal.

[0103] Among them, synchronous grouting is to inject slurry into the ground around the tunnel through the grouting holes during the advancement of the shield machine to fill the gap at the shield tail, stabilize the ground and prevent surface settlement. Specific operation steps:

[0104] Step 801, adjusting grouting parameters;

[0105] Adjust the grouting pressure, grouting volume and grouting rate according to actual conditions;

[0106] Step 802, increasing the grouting frequency;

[0107] Increase the frequency of grouting during excavation to ensure that the gap at the shield tail is filled in time;

[0108] Step 803, selecting a suitable slurry;

[0109] Select the appropriate slurry type according to geological conditions, such as cement slurry, chemical slurry, etc.

[0110] Among them, secondary grouting is to grout the already grouted area again on the basis of the initial grouting to further improve the stability and density of the formation. The specific operation steps are:

[0111] Step 804, selecting a grouting position;

[0112] According to the effect of the initial grouting, select the location where the secondary grouting is required;

[0113] Step 805, adjusting grouting parameters;

[0114] Adjust grouting pressure, grouting volume and grouting rate according to formation conditions;

[0115] Step 806, grouting operation;

[0116] A secondary grouting operation is carried out to ensure that the formation is fully filled.

[0117] Among them, geological radar scanning is a non-destructive geological detection technology that detects underground structures and geological conditions by emitting electromagnetic waves and receiving reflected signals. The specific operation steps are:

[0118] Step 901: deploying radar antenna;

[0119] Lay out geological radar antennas on the surface to ensure coverage of the areas that need to be inspected;

[0120] Step 902: transmitting and receiving signals;

[0121] Transmit electromagnetic waves and receive reflected signals to record data;

[0122] Step 903: data analysis;

[0123] The collected data is analyzed to generate geological radar images to evaluate the geological structure and grouting effect.

[0124] Among them, intensified monitoring of surface subsidence means arranging more subsidence monitoring points on the surface, increasing the monitoring frequency, and monitoring the surface subsidence in real time. The specific operation steps are as follows:

[0125] Step 904: deploy monitoring points;

[0126] Set up settlement monitoring points at key locations on the surface to ensure coverage of the entire construction area;

[0127] Step 905: Increase the monitoring frequency;

[0128] Increase the frequency of monitoring to daily or hourly;

[0129] Step 906: data recording and analysis;

[0130] Record the data of each monitoring and form a monitoring report; analyze the monitoring data, evaluate the trend of surface subsidence, and take timely measures.

[0131] like Figure 2 As shown, the present invention also provides a combined statistical system for the slag discharge amount of a slurry shield machine, which is used to implement the combined metering method for the slag discharge amount of a slurry shield machine in the above scheme, including a mud tank monitoring module, a slag yard monitoring module, a mud pipeline monitoring module, and a data processing module; the mud tank monitoring module includes a first density meter and a liquid level ruler, the first density meter is used to measure the density change of the mud in the mud tank before and after the slurry shield machine is excavated, and the liquid level ruler is used to measure the initial liquid level change of the mud in the mud tank before and after the slurry shield machine is excavated; the slag yard monitoring module includes a 3D industrial laser scanner and a ground slag looseness coefficient measuring module. The square box and the 3D industrial laser scanner are used to measure the volume change of the slag in the landfill before and after the slurry shield machine is excavated; the square box for measuring the loose coefficient of the ground slag is used to measure the loose coefficient of the slag discharged from the landfill; the mud pipeline monitoring module includes a flow meter and a second density meter, the two flow meters are used to measure the slurry flow rate of the slurry inlet pipeline and the slurry flow rate of the slurry outlet pipeline respectively, and the two second density meters are used to measure the slurry density of the slurry inlet pipeline and the slurry density of the slurry outlet pipeline respectively; the data processing module is used to receive the data measured by the mud tank monitoring module, the landfill monitoring module and the mud pipeline monitoring module, and perform calculations.

[0132] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0133] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A combined metering method for the slag discharge of a slurry shield machine, characterized in that: The change of mud in the mud tank before and after each ring of the slurry shield machine is measured; the change of slag in the slag field during the whole process of the slurry shield machine excavation is measured; the actual slag output is calculated by combining the two changes; Calculate the actual volume verification according to the specifications of the slurry shield machine; measure the flow and density of the slurry pipeline in real time during the whole excavation process, and calculate the actual volume verification volume; A first deviation between the actual cubic verification volume and the actual cubic slag discharge amount is calculated, and a second deviation between the actual cubic slag discharge verification amount and the actual cubic slag discharge amount is calculated. By judging the first deviation and the second deviation, the actual cubic slag discharge amount is verified.

2. The combined metering method for slag discharge of a slurry shield machine according to claim 1, characterized in that: The method of measuring the change in the slurry in the slurry tank before and after each ring segment of the slurry shield machine is excavated specifically comprises the following steps: Step 101: Before excavation, use a first densitometer to measure the initial density of the mud in the mud tank; use a liquid level ruler to measure the initial liquid level of the mud in the mud tank; Step 102: After the excavation cycle is completed, wait for the mud level in the mud tank to stabilize; Step 103: using a first densitometer to measure the final density of the mud in the mud tank; using a liquid level ruler to measure the final liquid level height of the mud in the mud tank; Step 104, calculate the change in the mud in the mud tank before and after each ring of segments is excavated, and the calculation formula is: Mud change = (end liquid level × end density - initial liquid level × initial density) × π × square of the mud tank radius.

3. The combined metering method for slag discharge of a slurry shield machine according to claim 1, characterized in that: The method of measuring the change amount of the slag in the slag field during the whole excavation process of the slurry shield machine specifically includes the following steps: Step 201: Before excavation, use a 3D industrial laser scanner to scan the landfill to obtain an initial landfill volume; Step 202: After excavation, use a 3D industrial laser scanner to scan the landfill to obtain the final landfill volume; Step 203, using the ground slag loose coefficient measuring box to measure the loose coefficient of the slag discharged from the slag field; Step 204, calculate the change amount of the slag in the slag field during the whole excavation process, the calculation formula is: The change of the landfill soil volume = (final landfill soil volume - initial landfill soil volume) ÷ loose coefficient.

4. The combined metering method for slag discharge of a slurry shield machine according to claim 1, characterized in that: The steps of calculating the actual slag discharge volume by combining the two changes are as follows: Step 3: Sum the change in the mud in the mud tank and the change in the slag in the landfill, and calculate the formula: actual slag output = change in mud + change in the slag in the landfill.

5. The combined metering method for slag discharge of a slurry shield machine according to claim 1, characterized in that: The actual volume verification is calculated according to the specifications of the slurry shield machine, specifically comprising the following steps: Step 401, obtaining parameters of a slurry shield machine, including a shield excavation diameter and a segment width; Step 402, calculate the actual square verification volume, the calculation formula is: Actual square verification volume = (π×square of shield excavation diameter×segment width) ÷ 4.

6. The combined metering method for slag discharge of a slurry shield machine according to claim 1, characterized in that: The real-time measurement of the flow rate and density of the mud pipeline during the whole excavation process and the calculation of the actual slag verification amount specifically include the following steps: Step 501: During the whole excavation process, at the inlet of the mud pipeline, a flow meter is used to periodically measure the inlet flow rate of the mud, and a second density meter is used to periodically measure the inlet density of the mud; at the outlet of the mud pipeline, a flow meter is used to periodically measure the outlet flow rate of the mud, and a second density meter is used to periodically measure the outlet density of the mud; Step 502: at each cycle end point, record the excavation distance and measure the specific gravity of the surrounding rock; Step 503, calculate the amount of slag discharged through the slurry pipeline after traveling a certain excavation distance in a single cycle, and the calculation formula is: the amount of slag in a single cycle = excavation distance × (inlet slurry flow × inlet slurry density - outlet slurry flow × outlet slurry density); Step 504, calculate the actual slag check volume, the calculation formula is: The actual volume of slag verification = (the volume of slag in the first cycle + the volume of slag in the second cycle + … + the volume of slag in the nth cycle) ÷ the average value of the surrounding rock density, where n is a natural number.

7. The combined metering method for slag discharge of a slurry shield machine according to claim 1, characterized in that: The first deviation between the actual cubic verification volume and the actual cubic slag discharge volume is calculated using the calculation formula: The first deviation = ︱(actual cubic slag volume / actual cubic verification volume) - 1︱; The second deviation between the actual cubic slag discharge verification amount and the actual cubic slag discharge amount is calculated using the calculation formula: The second deviation = ︱(actual cubic slag discharge amount / actual cubic slag discharge verification amount) - 1︱.

8. The combined metering method for slag discharge of a slurry shield machine according to claim 1, characterized in that: The checking of the actual slag discharge amount by judging the first deviation and the second deviation specifically includes the following judging steps: If the first deviation is less than or equal to 5%, it is determined that the actual slag discharge volume meets the theoretical value and the construction is normal; If the first deviation is greater than 5%, compare the actual slag discharge volume with the actual volume verification volume. When the actual slag discharge volume is greater than the actual volume verification volume, it means that too much slag is discharged during the excavation process, and it is necessary to check whether there is over-excavation; when the actual slag discharge volume is less than the actual volume verification volume, it means that insufficient slag is discharged during the excavation process, and it is necessary to check whether there is insufficient excavation radius or mud cake phenomenon; If the second deviation is less than or equal to 10%, it is considered that the actual slag discharge volume is close to the actual slag discharge verification volume, and the measurement result of the actual slag discharge volume is credible; if the second deviation is greater than 10%, maintenance work is performed.

9. The combined metering method for slag discharge of a slurry shield machine according to claim 8, characterized in that: The maintenance work includes the following steps: Check whether the flow meter or density meter has errors, and calibrate or replace them in time; Check whether there are any problems with the control system, and inspect, repair and update them in a timely manner; Check whether the geological conditions have changed and adjust the excavation parameters in time according to the latest geological conditions.

10. A combined statistical system for the discharge amount of a slurry shield machine, used to implement the combined measurement method for the discharge amount of a slurry shield machine as claimed in any one of claims 1 to 9, characterized in that: Including mud tank monitoring module, landfill monitoring module, mud pipeline monitoring module and data processing module; The mud tank monitoring module includes a first densitometer and a liquid level scale, wherein the first densitometer is used to measure the density change of the mud in the mud tank before and after the slurry shield machine is excavated, and the liquid level scale is used to measure the initial liquid level height change of the mud in the mud tank before and after the slurry shield machine is excavated; The landfill monitoring module includes a 3D industrial laser scanner and a ground slag loose coefficient determination box. The 3D industrial laser scanner is used to measure the volume change of the slag in the landfill before and after the slurry shield machine is excavated; the ground slag loose coefficient determination box is used to measure the loose coefficient of the slag discharged from the landfill; The mud pipeline monitoring module includes a flow meter and a second density meter, the two flow meters are used to measure the inlet flow rate of the slurry inlet pipeline and the outlet flow rate of the slurry outlet pipeline respectively, and the two second density meters are used to measure the inlet density of the slurry inlet pipeline and the outlet density of the slurry outlet pipeline respectively; The data processing module is used to receive the data measured by the mud tank monitoring module, the slag yard monitoring module and the mud pipeline monitoring module, and perform calculations.

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