Application of Tunnel Grouting Electromagnetic Flowmeter

Abstract: The application information of tunnel grouting electromagnetic flowmeter is provided by excellent flowmeter and flowmeter manufacturers. Several sets of electromagnetic flowmeters are selected for the municipal engineering Haicang submarine tunnel, which are specially used for tunnel grouting. At present, Jingchuan flowmeters have been used in the city's main municipal projects: Haicang submarine tunnel, Metro Line 3 Wuyuanwan Tunnel, Lianyue Tunnel , China Railway Eighteenth Bureau, China Railway Tunnel, China. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the application details of tunnel grouting electromagnetic flowmeters. The municipal engineering Haicang Submarine Tunnel selected several sets of electromagnetic flowmeters from the company, which are specially used for tunnel grouting. The flow measurement of grouting and water during grouting construction is very important. In particular, the liquid flow detectors used have their special requirements, such as facilitating frequent cleaning and being able to withstand high-speed grouting and the friction of particles in harsh environments. Among flow instrument products, the advantages of electromagnetic flowmeters are that they are not affected by fluid temperature, pressure, density and viscosity, the internal flow is stable, the electrical measurement is direct, the measurement accuracy is high, and the response speed is fast. Its detection part has no moving parts, and there will be no dripping phenomenon, and the inner lining can be made of PTFE plastic and alumina ceramics, which has strong corrosion resistance. In recent years, it has become the instrument of choice for flow measurement in grouting projects. Precautions for the application of tunnel grouting electromagnetic flowmeter 1 Influence on the amount of mud attached to the measuring pipeline and treatment . The electromagnetic flowmeter measuring tube and the connected grout tube are stuck or even blocked. Adhesion layers in the measuring tube of an electromagnetic flowmeter can cause other relative errors. The conductivity of the cement layer is extremely low. The greater the thickness of the attachment, the greater the error. 2 Influence and handling of air bubbles in the medium Due to the process or the medium itself, the measured liquid usually contains some air bubbles. When air bubbles pass through the electrode surface, a friction process occurs on the electrode surface, resulting in a value of the spike interference potential that is much larger than normal. Often, electromagnetic flow converters cannot handle such disturbances effectively, resulting in unstable measurement values. Therefore, the installation location of the electromagnetic flowmeter should be considered to prevent the generation of air bubbles. Typically, it should be installed on the discharge end of the pump, preferably vertically. The slurry flows from bottom to top. When installing horizontally, keep the electrode axis parallel to the horizontal line, not perpendicular to the horizontal line, as the bottom electrode is easily covered by sediment and the top electrode is easily covered by accidental air bubbles in the liquid. electrode surface. 3 Influence and treatment of harsh construction site environment Most of the time, the environment of grouting construction site is relatively harsh, such as (continued on page 131) (continued on page 108) high temperature, high humidity, high dust, etc., time condensation water and dust are easy to accumulate In EMF junction boxes, or through poorly sealed joints into the EMF enclosure, this will cause the EMF converter's input loop impedance to drop and impair flow. The signal is sent to the amplifier; or the insulation of the excitation circuit and the signal circuit is broken, resulting in a severe EMF failure. To avoid such failures, the junction box can be filled with insulating material. When maintaining and debugging the EMF, it is necessary to avoid water ingress, keep the junction box dry and clean, and avoid immersion in water or mud during use. At present, China is in a new climax of engineering construction. The amount of cement grout is very large. It is very important to measure the amount of cement grout dynamically and accurately. With its unique advantages, EMF has become the instrument of choice for flow measurement in grouting projects and can be widely used. Compared with using a straightedge, the accuracy of measuring the amount of mud with an electromagnetic flowmeter is greatly improved, many human factors are avoided, and it plays an important role in ensuring the authenticity of the data and ensuring the quality of the project. However, the EMF should be checked and checked before use to ensure the desired accuracy. The following is an application case of electromagnetic flowmeter grouting tunnel engineering.“At present, the tunnel has entered the main line tunnel construction through the shaft, and is only 50 meters away from the nearest sea area.”Standing at the excavation site of the Haishu End Tunnel (Haishu Undersea Tunnel) of Xiamen West Second Passage, the on-site staff said loudly in the roar of the machine,“By the end of this year, the construction of the West Second Passage will officially enter the sea and gradually excavate to a depth of 72 meters.”The construction site of the tunnel grouting electromagnetic flowmeter construction unit (China Railway 18th Bureau) was at the construction site of Xiamen West Second Passage. Large-scale machinery roared, and earthmoving vehicles came and went with slag. It was a busy scene as workers worked with machines to reinforce the tunnels dug. According to the information provided by Xiamen Road and Bridge Construction Group, since the start of construction in March last year, the cut-and-cover earthwork of the entrance section of the Second West Passage Tunnel (Haicang end) has been completed. The 155-meter shaft excavation of the left line tunnel), the shaft excavation and support construction have been completed. The inclined shaft of the island section has been completed, the C ramp has been completed with 256 meters; the service tunnel has been completed with 152 meters. The ventilation shaft enclosure has been completed and is currently being excavated. The main structure of the upper-span subway section has been completed, and the handover and reconstruction have been restored; the open-cut structure has completed 585 pile foundations. According to reports, as of the end of September, the project has completed 72.3% of the annual investment plan for construction and installation, and the overall construction period is controllable.
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