Method and system for testing earth pressure sensor of shield machine

Abstract

The application discloses a shield machine earth pressure sensor testing method and system, and belongs to the technical field of shield machine equipment. The testing method comprises the following steps: dividing the earth chamber pressure range of the shield machine into a low pressure interval, a medium pressure interval and a high pressure interval; pressurizing the linear pressure-bearing chamber by using an air compressor, so that the air pressure in the pressure-bearing chamber reaches the medium pressure interval, the medium pressure interval test is performed, and the pressure value measured by the earth pressure sensor displayed on the pressure gauge and the upper computer is recorded; the pressure in the pressure-bearing chamber is reduced and linearly reduced to the low pressure interval by cooperating the pressure regulating valve and the air release ball valve; the earth pressure sensor of the shield machine is tested by using the self-created and innovative air pressure testing system, the problems that the earth pressure sensor of the shield machine needs to be detected by outsourcing, the test is inconvenient, and the outsourcing detection cannot be close to the actual situation to affect the test accuracy are effectively solved, and the on-site shield machine earth pressure sensor test is convenient, the test is close to the actual situation, and the accuracy is improved.

Description

Technical Field

[0001] This application relates to the field of tunnel boring machine (TBM) equipment technology, and in particular to a method and system for testing earth pressure sensors for TBMs. Background Technology

[0002] With the rapid development of my country's economy and society, urban surface traffic pressure is increasing. Urban rail transit, represented by subways, plays a crucial role in alleviating urban traffic pressure, and tunnel boring machine (TBM) construction is one of the most widely used methods for subway tunnel construction. A TBM is a specialized large-scale engineering equipment used for underground tunnel excavation, with functions including excavation and cutting of soil, transporting excavated material, assembling tunnel lining, and measurement and guidance correction. The earth pressure sensor in the TBM is mainly used to detect the soil chamber pressure. Based on the data fed back by the earth pressure sensor, the TBM operator takes corresponding measures to adjust the soil chamber pressure until it reaches the set range, achieving earth pressure balance and effectively controlling surface settlement. The error of the earth pressure sensor needs to be tested during the initial acceptance of the TBM or during major overhauls to ensure it is within the allowable range.

[0003] Typically, testing of earth pressure sensors requires outsourcing to professional testing agencies, which not only increases maintenance costs but also wastes maintenance time. Summary of the Invention

[0004] This application provides a method and system for testing earth pressure sensors in tunnel boring machines (TBMs), which solves the problem of inconvenient earth pressure sensor testing in the prior art, realizes simplified testing of earth pressure sensors in TBMs, and improves testing accuracy.

[0005] This application provides a testing system for the aforementioned testing method, the testing system comprising: an earth pressure sensor for a tunnel boring machine (TBM), a pressure chamber, a host computer, an air compressor, a conduit, a ball valve, a pressure regulating valve, a pressure gauge, and a deflation ball valve; the earth pressure sensor of the TBM is installed on the pressure chamber and electrically connected to the host computer; the air compressor is connected to the pressure chamber via a conduit, a ball valve, a pressure regulating valve, a pressure gauge, and a deflation ball valve; the testing method comprises: dividing the pressure range of the TBM's earth chamber into a low-pressure range, a medium-pressure range, and a high-pressure range; linearly pressurizing the pressure chamber with the air compressor until the air pressure inside the pressure chamber reaches the medium-pressure range, performing a medium-pressure range test, and recording the pressure values ​​measured by the earth pressure sensor and displayed on the host computer; using the pressure regulating valve and the deflation ball valve in conjunction to linearly reduce the air pressure inside the pressure chamber to the low-pressure range; and reducing the air pressure inside the pressure chamber... During the process, a decompression test was conducted, and the pressure values ​​measured by the earth pressure sensor and displayed on the host computer were recorded multiple times. When the air pressure in the pressure chamber dropped to the low-pressure range, a low-pressure range test was conducted, and the pressure values ​​measured by the earth pressure sensor and displayed on the host computer were recorded. After the low-pressure range test, the air compressor linearly pressurized the pressure chamber until the air pressure in the pressure chamber reached the high-pressure range. During the pressurization process, a pressurization test was conducted, and the pressure values ​​measured by the earth pressure sensor and displayed on the host computer were recorded multiple times. When the air pressure in the pressure chamber reached the high-pressure range, a high-pressure test was conducted, and the pressure values ​​measured by the earth pressure sensor and displayed on the host computer were recorded. The recorded pressure values ​​measured by the earth pressure sensor and displayed on the host computer were comprehensively analyzed and calculated to obtain the error of the earth pressure sensor, and calibration was performed based on the error.

[0006] This application creatively designs and utilizes a simple air pressure testing system to test the earth pressure sensor of a tunnel boring machine (TBM), improving the convenience of testing. At the same time, it specifically divides the earth pressure range of the TBM into low-pressure, medium-pressure, and high-pressure ranges for testing, thereby improving the accuracy of testing. In addition, considering the measurement environment of possible pressure changes during the tunneling process, this application specifically conducts depressurization and pressurization tests to further improve the accuracy of testing.

[0007] Another aspect of this application provides a test system for earth pressure sensors of tunnel boring machines (TBMs). The test system comprises: an earth pressure sensor for the TBM, a pressure chamber, a host computer, an air compressor, a conduit, a ball valve, a pressure regulating valve, a pressure gauge, and a deflation valve. The earth pressure sensor is mounted on the pressure chamber and electrically connected to the host computer. The air compressor is connected to the pressure chamber via the conduit, ball valve, pressure regulating valve, pressure gauge, and deflation valve. Furthermore, a piston is fitted inside the pressure chamber. The piston has a compression cone protrusion on one side near the earth pressure sensor, and the other side is connected to the corresponding side wall of the pressure chamber via a return spring. The piston and the earth pressure sensor are filled with test soil, and the air pressure inside the pressure chamber is transmitted to the earth pressure sensor through the piston. This application creatively designs a simple air pressure test system for testing the earth pressure sensor of a TBM, which is convenient and fast. Furthermore, considering the actual working environment of the earth pressure sensor, this application further adopts the method of testing soil-conducted pressure, further improving the accuracy and relevance of the test.

[0008] The technical solution provided in this application has at least the following technical effects or advantages:

[0009] By adopting a self-designed pneumatic testing system for testing the earth pressure sensor of the tunnel boring machine, the problem of the current need for outsourced testing of earth pressure sensors for tunnel boring machines, which is inconvenient and the outsourced testing cannot closely reflect reality, thus affecting the accuracy of the test, is effectively solved. This makes on-site testing of earth pressure sensors for tunnel boring machines convenient, closely reflects reality, and improves accuracy. Attached Figure Description

[0010] Figure 1 This is a flowchart of the earth pressure sensor testing method for tunnel boring machines according to an embodiment of this application;

[0011] Figure 2 This is a flowchart of the earth pressure sensor testing method for tunnel boring machines according to an embodiment of this application;

[0012] Figure 3 This is a flowchart of the earth pressure sensor testing method for tunnel boring machines according to an embodiment of this application;

[0013] Figure 4 This is a flowchart of the earth pressure sensor testing method for tunnel boring machines according to an embodiment of this application;

[0014] Figure 5 This is a structural block diagram of the earth pressure sensor testing system for a tunnel boring machine according to an embodiment of this application;

[0015] Figure 6 This is a schematic diagram of the pressure chamber in the earth pressure sensor testing system for tunnel boring machines according to an embodiment of this application;

[0016] Figure 7This is a schematic diagram of the piston and extrusion cone in the earth pressure sensor testing system of the tunnel boring machine according to an embodiment of this application. Detailed Implementation

[0017] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0018] Please see Figure 1-7 A shield tunneling machine earth pressure sensor testing system 100 includes: an earth pressure sensor 110 for the shield tunneling machine, a pressure chamber 108, a host computer 111, an air compressor 101, a conduit 107, a ball valve 102, a pressure regulating valve 103, a pressure gauge 104, and a deflation ball valve 106.

[0019] The earth pressure sensor 110 of the tunnel boring machine is installed on the pressure chamber 108 and electrically connected to the host computer 111; the host computer obtains the pressure value based on the earth pressure sensor 110.

[0020] The air compressor 101 is connected to the pressure chamber 108 via a conduit 107, a ball valve 102, a pressure regulating valve 103, a pressure gauge 104, and a deflation valve 106. In an exemplary embodiment, the ball valve 102, the pressure regulating valve 103, and the pressure gauge 104 are connected in sequence, and the pressure gauge 104, the deflation valve 106, and the pressure chamber 108 are connected via a pneumatic triplet 105.

[0021] In an exemplary embodiment, the method for manufacturing the pressure chamber 108 is as follows: an explosion-proof flange hole is made according to the size of the earth pressure sensor and has sealing properties; a seamless steel pipe with a diameter of 80 mm and a length of 150 mm is cut and welded to a 10 mm thick flange plate to form a pressure chamber; the pressure chamber is drilled and threaded, and a quick-connect ventilator is installed and connected to the conduit.

[0022] In an exemplary embodiment, a piston 201 is fitted inside the pressure chamber 108. The piston 201 has a compression cone protrusion 2011 on the side near the earth pressure sensor 110 of the tunnel boring machine, and the other side is connected to the corresponding side wall of the pressure chamber 108 through a return spring 202. The piston 201 and the earth pressure sensor 110 of the tunnel boring machine are filled with test soil 200. The air pressure inside the pressure chamber 108 is transmitted to the earth pressure sensor 110 of the tunnel boring machine through the piston 201 and the test soil 200.

[0023] A method for testing earth pressure sensors in tunnel boring machines includes:

[0024] S1. Divide the pressure range of the tunnel boring machine's soil chamber into low-pressure, medium-pressure, and high-pressure zones;

[0025] S2. Pressurize the linear pressure chamber with an air compressor to bring the air pressure inside the pressure chamber to the medium pressure range, perform a medium pressure range test, and record the pressure values ​​measured by the soil pressure sensor and displayed on the host computer.

[0026] S3. The pressure regulating valve and the deflation valve work together to reduce the air pressure in the pressure chamber and reduce it linearly to the low pressure range. During the air pressure reduction process in the pressure chamber, a pressure reduction test is performed, and the pressure values ​​measured by the soil pressure sensor and displayed on the host computer are recorded multiple times.

[0027] S4. When the air pressure in the pressure chamber drops to the low pressure range, perform a low pressure range test and record the pressure values ​​measured by the soil pressure sensor and displayed on the host computer.

[0028] S5. After the low-pressure range test is completed, the air compressor will linearly pressurize the pressure chamber until the air pressure in the pressure chamber reaches the high-pressure range. During the pressurization process, a pressurization test will be conducted, and the pressure values ​​measured by the soil pressure sensor and displayed on the host computer will be recorded multiple times.

[0029] S6. When the air pressure in the pressure chamber reaches the high pressure range, perform a high pressure test and record the pressure values ​​measured by the earth pressure sensor and displayed on the host computer.

[0030] S7. By comprehensively analyzing and calculating the pressure values ​​recorded by the pressure gauge and the pressure values ​​measured by the earth pressure sensor displayed in the host computer, the error of the earth pressure sensor is obtained, and calibration is performed based on the error.

[0031] In an exemplary embodiment, the method for dividing the soil chamber pressure range of the tunnel boring machine in S1 is based on the soil chamber pressure of the current model of tunnel boring machine in previous tunneling processes under the current geological conditions, and divides it into low-pressure range, medium-pressure range and high-pressure range.

[0032] In an exemplary embodiment, in step S2, during the process of pressurizing the pressure chamber by an air compressor to bring the air pressure in the pressure chamber to the medium pressure range, the power of the air compressor increases linearly, and the pressure gauge values ​​are recorded at equal intervals.

[0033] In one exemplary embodiment, when testing in the low-pressure range, medium-pressure range, and high-pressure range, the air pressure inside the pressure chamber changes linearly within the corresponding pressure range.

[0034] In an exemplary embodiment, a method for obtaining the error of an earth pressure sensor by comprehensively analyzing and calculating the pressure values ​​recorded by the pressure gauge and those measured by the earth pressure sensor and displayed on the host computer includes: S71, calculating the average error of the earth pressure sensor in the low-pressure range, medium-pressure range, and high-pressure range based on the recorded results; S72, calculating the average error of the earth pressure sensor in the comprehensive range based on the average errors of the earth pressure sensors in the low-pressure range, medium-pressure range, and high-pressure range; and S73, correcting the earth pressure sensor using the average error of the earth pressure sensor in the comprehensive range.

[0035] The calculation method is as follows: Δ Di =S Ti -S Qi , i = 1, 2, ..., n1;

[0036] Δ Dj =S Tj -S Qj j = 1, 2, ..., n2;

[0037] Δ Dk =S Tk -S Qk k = 1, 2, ..., n3;

[0038]

[0039] in, and These represent the average errors of the earth pressure sensors in the low-pressure, medium-pressure, high-pressure, and combined pressure ranges, respectively; Δ Di S represents the pressure difference during the i-th test in the low-pressure range. Ti The soil pressure sensor measured the pressure value S during the i-th test in the low-pressure zone. Qi The pressure value measured by the pressure gauge during the i-th test in the low-pressure range; Δ Dj S represents the pressure difference during the j-th test in the medium-pressure range. Tj The soil pressure sensor measured the pressure value S during the j-th test in the medium-pressure section. Qj The pressure value measured by the pressure gauge during the j-th test in the medium-pressure range; Δ Dk S represents the pressure difference during the k-th test in the high-pressure range. Tk The earth pressure sensor measured the pressure value S during the k-th test in the high-pressure section. Qk The pressure value measured by the pressure gauge during the k-th test in the high-pressure range; n1, n2, and n3 are the number of tests in the low-pressure, medium-pressure, and high-pressure ranges, respectively; k1, k2, and k3 are weighting coefficients.

[0040] In an exemplary embodiment, the method for determining the error of the earth pressure sensor further includes: S74, calculating the average error of the earth pressure sensor during the depressurization and pressurization processes based on the recorded results; S75, calculating the pressure variation error of the earth pressure sensor based on the average error of the earth pressure sensor during the depressurization and pressurization processes; S76, correcting the earth pressure sensor using the pressure variation error of the earth pressure sensor; the calculation method is as follows: Δ Dp =S Tp -S Qp p = 1, 2, ..., n4;

[0041] Δ Dq =S Tq -S Qq q = 1, 2, ..., n5;

[0042]

[0043] in, and These represent the average error of the earth pressure sensor and the pressure-transformation error of the earth pressure sensor during the depressurization and pressurization processes, respectively; Δ Dp S represents the pressure difference during the p-th test in the pressure reduction process. Tp S represents the pressure value measured by the earth pressure sensor during the p-th test in the depressurization process. Qp Δ is the pressure value measured by the pressure gauge during the p-th test in the pressure reduction process. Dq S represents the pressure difference during the q-th test in the pressurization process. Tq S represents the pressure value measured by the earth pressure sensor during the q-th test in the pressurization process. Qp n is the pressure value measured by the pressure gauge during the qth test in the pressurization process, n4 and n5 are the number of tests in the depressurization and pressurization processes, respectively; k4 and k5 are weighting coefficients.

[0044] In an exemplary embodiment, test soil is disposed in the pressure chamber at the contact position with the earth pressure sensor, and the air pressure in the pressure chamber is transmitted to the earth pressure sensor of the tunnel boring machine through the test soil; the method for configuring the test soil includes: S101, exploring and collecting geological soil for the tunnel boring machine to carry out tunneling operations; S102, performing particle size and physical property analysis on the geological soil to obtain analysis results; S103, configuring the corresponding test soil according to the analysis results.

[0045] In an exemplary embodiment, the average particle size of the test soil is the same as that of the geological soil; and the corresponding physical properties are the same, including the moisture content, i.e., the moisture content of the test soil is the same as that of the geological soil.

[0046] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0047] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the functions specified in one or more boxes. Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0048] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0049] The above description is merely a preferred embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present application, based on the technical solution and concept of the present application, should be covered within the scope of protection of the present application.

Claims

1. A method for testing earth pressure sensors in tunnel boring machines, characterized in that, The testing method is applied to a testing system, which includes: an earth pressure sensor for the tunnel boring machine, a pressure chamber, a host computer, an air compressor, a conduit, a ball valve, a pressure regulating valve, a pressure gauge, and a deflation ball valve; The earth pressure sensor of the tunnel boring machine is installed on the pressure chamber and connected to the host computer. The air compressor is connected to the pressure chamber via a conduit, ball valve, pressure regulating valve, pressure gauge, and deflation valve; The testing method includes: The pressure range of the tunnel boring machine's soil chamber is divided into low-pressure, medium-pressure, and high-pressure zones. The air compressor pressurizes the linear pressure chamber until the air pressure inside the chamber reaches the medium pressure range. A medium pressure range test is then conducted, and the pressure values ​​measured by the soil pressure sensor and displayed on the host computer are recorded. The pressure regulating valve and the deflation valve work together to reduce the air pressure in the pressure chamber linearly to the low pressure range; during the air pressure reduction process in the pressure chamber, a pressure reduction test is performed, and the pressure values ​​measured by the earth pressure sensor and displayed on the host computer are recorded multiple times. When the air pressure inside the pressure chamber drops to the low-pressure range, a low-pressure range test is performed, and the pressure values ​​measured by the soil pressure sensor and displayed on the host computer are recorded. After the low-pressure range test is completed, the air compressor linearly pressurizes the pressure chamber until the air pressure in the pressure chamber reaches the high-pressure range. During the pressurization process, a pressurization test is performed, and the pressure values ​​measured by the soil pressure sensor and displayed on the host computer are recorded multiple times. When the air pressure in the pressure chamber reaches the high pressure range, a high pressure test is performed, and the pressure values ​​measured by the earth pressure sensor and displayed on the host computer are recorded. By comprehensively analyzing and calculating the pressure values ​​recorded by the pressure gauge and the pressure values ​​measured by the earth pressure sensor displayed on the host computer, the error of the earth pressure sensor is obtained, and calibration is performed based on the error.

2. The method for testing earth pressure sensors in tunnel boring machines according to claim 1, characterized in that, A method for obtaining the error of an earth pressure sensor by comprehensively analyzing and calculating the pressure values ​​measured by the earth pressure sensor and the pressure values ​​displayed on the host computer, including: calculating the average error of the earth pressure sensor in the low-pressure, medium-pressure, and high-pressure ranges from the recorded results; calculating the average error of the earth pressure sensor in the comprehensive range based on the average errors of the earth pressure sensors in the low-pressure, medium-pressure, and high-pressure ranges; and correcting the earth pressure sensor using the average error of the earth pressure sensor in the comprehensive range.

3. The method for testing earth pressure sensors in tunnel boring machines according to claim 2, characterized in that, ； ， 1； ； ， 2； ； ， 1，2，...， ； ； in, , and These are the average errors of the earth pressure sensors in the low-pressure, medium-pressure, high-pressure, and combined pressure ranges, respectively. The first low-pressure zone The pressure difference of each test. Low pressure range The earth pressure sensor measured the pressure value in this test. Low pressure range The pressure value measured by the pressure gauge in this test; For the medium pressure range The pressure difference of each test. Medium pressure range The earth pressure sensor measured the pressure value in this test. Medium pressure range The pressure value measured by the pressure gauge in this test; For the high-voltage section The pressure difference of each test. High-voltage section The earth pressure sensor measured the pressure value in this test. High-voltage section The pressure value measured by the pressure gauge in this test; 1. 2 and 3 represents the number of tests in the low-pressure, medium-pressure, and high-pressure ranges, respectively. , and These are the weighting coefficients.

4. The method for testing earth pressure sensors in tunnel boring machines according to claim 1, characterized in that, Based on the recorded results, the average error of the earth pressure sensor during the depressurization and pressurization processes is calculated; based on the average error of the earth pressure sensor during the depressurization and pressurization processes, the pressure variation error of the earth pressure sensor is calculated, and the earth pressure sensor is corrected using the pressure variation error of the earth pressure sensor.

5. The method for testing earth pressure sensors in tunnel boring machines according to claim 4, characterized in that, ； ， 4； ； ， 5； ； in, , and These represent the average error of the earth pressure sensor and the pressure-varying error of the earth pressure sensor during depressurization and pressurization processes, respectively. For the first step in the blood pressure reduction process Pressure difference in the second test For the first step in the blood pressure reduction process The pressure value measured by the earth pressure sensor in this test. For the first step in the blood pressure reduction process The pressure value measured by the pressure gauge in this test; For the first stage of pressurization Pressure difference in the second test For the first stage of pressurization The pressure value measured by the earth pressure sensor in this test. For the first stage of pressurization The pressure value measured by the pressure gauge in this test. 4 and 5 represents the number of tests during the depressurization and pressurization processes; and These are the weighting coefficients.

6. The method for testing earth pressure sensors in tunnel boring machines according to claim 1, characterized in that, Test soil is placed in the pressure chamber at the contact point with the earth pressure sensor. The air pressure in the pressure chamber is transmitted to the earth pressure sensor of the tunnel boring machine through the test soil.

7. The method for testing earth pressure sensors in tunnel boring machines according to claim 6, characterized in that, The method for preparing test soil includes: exploring and collecting geological soil for the tunnel boring machine to carry out tunneling operations; analyzing the particle size and physical properties of the geological soil to obtain the analysis results; and preparing the corresponding test soil based on the analysis results.

8. The method for testing earth pressure sensors in tunnel boring machines according to claim 7, characterized in that, The average particle size of the test soil is the same as that of the geological soil, and the moisture content of the test soil is the same as that of the geological soil.

9. The method for testing earth pressure sensors in tunnel boring machines according to claim 1, characterized in that, A piston is fitted inside the pressure chamber. The piston has a compression cone protrusion on the side near the earth pressure sensor of the tunnel boring machine, and the other side is connected to the corresponding side wall of the pressure chamber through a return spring. The piston and the earth pressure sensor of the tunnel boring machine are filled with test soil, and the air pressure in the pressure chamber is transmitted to the earth pressure sensor of the tunnel boring machine through the piston.

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