Railway static level instrument tunnel settlement

Description :

　　The HR8066/67 high-precision static level is suitable for monitoring vertical displacement or settlement deformation with high requirements, and can monitor liquid level changes up to 0.01mm. The instrument consists of a series of containers containing liquid level sensors, which are connected by liquid filled connecting pipes between multiple containers. The reference container is located at a stable reference point, and any elevation change between the container and the reference container will cause a corresponding change in the liquid level inside the container. The elevation change of the measuring point can be obtained by measuring the liquid level change.

　　The HR8066/67 high-precision static level adopts pressure sensitive components of global quality. The static level product adopts a multi-point full range temperature compensation process of -20-60 ℃, which has the advantages of high measurement accuracy, no drift, strong reliability, and easy installation. The sealed shell has good moisture resistance and can work continuously for a long time in a relative humidity environment.

　　2. Technical parameters of static level

　　①. Main performance indicators

　　Standard range: 1000mm or other

　　Accuracy: ＜ ± 0.3mm

　　Resolution: 0.01mm

　　Annual stability: ＜ ± 0.5mm

　　Overload capacity: 200% F? S

　　②. temperature characteristic

　　Working temperature range: -20~85 ℃

　　Temperature compensation range: -20-60 ℃

　　Temperature sensor:

　　Temperature measurement range -40~150 ℃

　　Temperature measurement accuracy ± 0.2 ℃

　　③. Electrical Characteristics

　　Electrical Connection: Waterproof Four core Plug in

　　Supply voltage: 5-24VDC (HR8066)

　　12～24VDC（HR8067）

　　Output signal: MODBUS-RUT (HR8066)

　　4～20mA（HR8067）

　　Power protection: anti reverse connection, overvoltage protection

　　Communication interface: RS485, electrostatic protection

　　④. structural characteristics

　　Shell material: Aluminum alloy

　　Pipeline connector: stainless steel quick connector or stainless steel threaded locking connector

　　⑤. environmental characteristics

　　Protection level: IP67

　　Installation method: The exhaust valve is fixed vertically with the exhaust valve facing upwards

　　Automated monitoring of subway (existing line)

　　Project Background

　　2018/9/13

　　The railway culvert construction project of a high-speed railway station in a county of Hefei City has a frame bridge that passes through the up and down lines of the railway from north to south, with a distance of 5m between the lines at the crossing point. In the construction of railway culverts, the construction beam is a commonly used equipment for overhead lines in the railway underpass structure, which directly affects the safety of railway vehicles.

　　Due to the direct positioning of the railway track on the construction beam, changes in the posture of the construction beam will directly affect the safety of railway operation. The construction convenience beam itself is a mature directional product, and its structure can bear the load of traffic without any problem. However, because its fulcrum is set on a temporarily reinforced foundation, and the deflection of the underlying structure during construction has a direct and significant impact on the temporary foundation, the settlement and deformation of the support will directly affect the posture of the construction convenience beam.

　　In order to ensure the safety of railway operation, the construction unit and monitoring technology team applied an automated deformation monitoring system to conduct real-time monitoring of the temporary beam.

　　1、 Observation of Settlement of Bianliang

　　This part adopts an automated monitoring system+Shaanxi Hengrui HR8066 static level.

　　monitoring process

　　A monitoring point is set up every 8.5m for the downlink and every 10m for the uplink, for a total of 13 monitoring points;

　　Set up one monitoring base point at the stable foundation on the right side of the up line beam, for a total of one base point.

　　At the same time as installing 13 monitoring points of Shaanxi Hengrui HR8066 static level on the temporary beam, a foundation pier is buried at the stable foundation on the right side of the upward line. After the foundation pier is stable, the benchmark point Shaanxi Hengrui HR8066 static level and liquid storage tank are fixed on the foundation pier. Then connect the liquid pipe, gas pipe, and cable to inject static level liquid, forming an internal smooth and externally closed water and gas system. After installation, it is necessary to check and discharge the bubbles in the liquid pipe to avoid data fluctuations caused by bubble displacement.

　　After the installation of the Shaanxi Hengrui HR8066 static level is completed, it is connected to the RocBox terminal through a serial cable, and RocBox controls the data collection of the Shaanxi Hengrui HR8066 static level. Then, based on the project situation, use RocMoS software to control the RocBox terminal to set parameters, change monitoring cycles, etc. In case of emergency, remote control and data testing can be performed. The collected data is transmitted in real-time to the server through 4G network, allowing for real-time monitoring of the on-site situation.

　　2、 Uneven settlement of temporary bridge beams

　　The uneven settlement of the temporary bridge crossbeam can easily lead to the risk of train overturning. In order to monitor the posture of the temporary bridge crossbeam in real-time under construction deflection and ensure safe vehicle operation, we use a box type fixed inclinometer to monitor the uneven settlement of the temporary bridge crossbeam. By monitoring the temporary bridge crossbeam, we can deduce the uneven settlement of the railway sleeper rail.

　　Both the up and down lines are equipped with inclinometers every 12 meters, for a total of 10 inclinometers. The inclinometer is installed on the inside of the temporary beam, and during installation, it should be ensured that the x and y axes are horizontal as much as possible, after all, its range is only 5 degrees. After the installation of the inclinometer is completed, it is also connected to the RocBox monitoring terminal through a serial port cable, and RocBox controls the inclinometer to collect data.

　　3、 Achievement display

　　The observation frequency of this project is set to once every 60 minutes, and the monitoring data of each observation cycle will be transmitted to the monitoring software for data analysis. The monitoring cloud platform can output multiple formats of monitoring reports to report to the construction unit. The construction unit can timely understand the impact of construction on the temporary beam and take remedial measures in case of abnormal situations.

　　4、 Project Highlights

　　This automatic monitoring project uses 14 Shaanxi Hengrui HR8066 static level and 10 biaxial inclinometers. These sensors are connected in series into two lines to the same RocBox monitoring terminal and are all powered by the terminal. No additional power supply is required. It really realizes that one monitoring terminal is connected to multiple sensors at the same time. A set of systems can display the monitoring results of different sensors, saving the project cost for customers.

　　Summary

　　The project uses Shaanxi Hengrui HR8066 static level automatic monitoring system, which well meets the customer's demand for a project to use a set of systems to access a variety of different sensors. At present, the project has been ongoing for over a month, and the monitoring system is running stably. The accuracy of the monitoring data meets the customer's requirements, and the monitoring results have provided good guidance for the construction progress.

AfterSalesService :

• Railway static level