Installation principle manual for static level case

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)

　　July 10th, 2014

　　Manual for Automated Monitoring Operation of Subway (Existing Line)

　　catalogue

　　1、 Compilation basis .................................1

　　2、 Introduction and application of Shaanxi Hengrui HR8066 static level .....................2

　　1. Overview of Shaanxi Hengrui HR8066 Static Water Level ....................................2

　　2. The principle of Shaanxi Hengrui HR8066 static level ....................................2

　　3、 Steps and detailed content for setting up measuring points ...................4

　　1. Lay a horizontal line ..................................4

　　2. Tunnel drilling ..................................4

　　3. Bracket installation ..................................5

　　4. Fixed Shaanxi Hengrui HR8066 static level iron pipe ..........................5

　　5. Wire layout and installation, water pipe connection ..................5

　　(1) Wiring layout and installation ..................................5

　　(2) Water pipe connection ........................................6

　　5. Fill and level the water tank with water ............................7

　　6. Installation of data collection box ............................7

　　4、 Safety assurance measures and precautions ...................7

　　1. Precautions for monitoring in subway lines ..........................7

　　2. Implement safety responsibilities ......................................8

　　5、 Measurement point protection measures .............................9i

　　Manual for Automated Monitoring Operation of Subway (Existing Line)

　　1、 Compilation basis

　　The main specifications, regulations, and standard documents followed in this third-party monitoring are as follows:

　　Code for Engineering Surveying (GB50026-2007)

　　Code for Deformation Measurement of Buildings (JGJ 8-2007)

　　Code for Construction and Acceptance of Underground Railway Engineering (GB50299-2003)

　　Technical Regulations for Monitoring and Measurement of Metro Engineering (DB11/490-2007)

　　Technical Code for Monitoring of Building Foundation Pit Engineering (GB50497-2009)

　　National Code for First and Second Class Leveling Surveying (GB 12897-2006)

　　Code for Surveying of Urban Rail Transit Engineering (GB 50308-2008)

　　Technical Regulations for Construction Surveying (DB11/T446-2007)

　　Third party monitoring plan for the Xiaohongmen recycled water pipeline (from Nanyuan Town West Road to Majiabao West Road) crossing the Daxing Line of the subway

　　The Third Party Monitoring Plan for the 110KV Switching and Reconstruction Project of Caishikou 220KV Station in Beijing (110KV Entrance and Exit Line Tunnel) near the Caishikou Station to Taoranting Station section of Metro Line 4, as well as the experience accumulated by Beijing Jianyetong Engineering Testing Technology Co., Ltd. during work on Metro Line 4.

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　　Manual for Automated Monitoring Operation of Subway (Existing Line)

　　2、 Introduction and Application of Shaanxi Hengrui HR8066 Static Water Level

　　1. Overview of Shaanxi Hengrui HR8066 Static Water Level

　　The Shaanxi Hengrui HR8066 static level system is a measurement system that utilizes the principle that liquids in connected containers always seek to have the same potential energy to measure and monitor the differences and changes in vertical height between reference points. It has high measurement accuracy and has been widely used in the field of measurement.

　　Beijing Subway Line 4 runs through an existing line, which is a straight section. The monitoring of existing line structures during the underpass of power tunnels is the link between construction and operation. The accuracy and timeliness of deformation monitoring will directly affect operational safety, as well as the progress, planning, and arrangement of construction. Therefore, it is necessary to ensure that monitoring can accurately and timely reflect the working status of existing lines. According to the current operation status of existing lines, traditional monitoring technology cannot implement operations in high-density driving sections during normal operation, nor can it meet the requirements of collecting, analyzing, and providing timely and accurate feedback on a large amount of data. Therefore, during the tunneling period of Line 4, the Shaanxi Hengrui HR8066 static level automatic real-time monitoring system was used to monitor the deformation of the existing line subgrade in real time. Due to the high accuracy, good automation performance, and real-time monitoring of the Shaanxi Hengrui HR8066 static level measurement system, it can well meet engineering requirements.

　　The Shaanxi Hengrui HR8066 static level (connected level settlement gauge) is composed of components such as a hydraulic cylinder, a float, a precision level gauge, a protective cover, and a support frame (as shown in the attached figure).

　　Buoy with measuring rod connected to liquid

　　Horizontal base point (fixed point) measured point

　　2. The principle of Shaanxi Hengrui HR8066 static level

　　The Shaanxi Hengrui HR8066 static level automatic measurement system mainly consists of a main container, connecting pipes, capacitive sensors, and other parts, used to measure the vertical displacement of each measuring point. Its testing principle is that each measuring point is connected to the reference point through a connecting pipe, and according to the principle that the liquid inside it maintains the same horizontal plane, when the main body of the instrument is

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　　Manual for Automated Monitoring Operation of Subway (Existing Line)

　　When the elevation of the pier changes, the liquid level of the main container changes, causing a change in the relative position between the float with the middle pole and the set of capacitor plates fixed on the top of the container. By using capacitive sensors to measure the relative changes in the liquid level inside each measuring point container, and transmitting them to the ground testing room through cables for processing and feedback, the settlement and deformation of the structure can be monitored in real time (Figure 1). The annular electrode 1, electrode 2, and the middle electrode of the instrument are fixed on the upper part of the instrument body container, forming two capacitors C1 and C2,

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　　Manual for Automated Monitoring Operation of Subway (Existing Line)

　　3、 Steps and detailed content of measuring point layout

　　1. Horizontal Line

　　Understand the general direction of the slope of the tunnel to ensure that the measuring points of Shaanxi Hengrui HR8066 static level are arranged in suitable positions. Use a level (as shown in the figure below) to horizontally place it on the track bed. After the level is level and stable, release a red laser with a horizontal line on the tunnel wall. Use chalk to mark the position where there are measuring points on the horizontal line. If the height difference is greater than 20cm, a turning point should be set up

　　2. Tunnel drilling

　　At the location where a fixed line is required in the tunnel (under the water pipe), there is a hole of about 1.5m~2m. The track bed needs to be equipped with measuring positions, structural settlement measuring points, Shaanxi Hengrui HR8066 static level support positions, and data acquisition box positions for drilling holes.

　　General drilling standards: 12mm for tunnel walls, 12mm for track beds, 18mm for structural settlement measurement points, and drilling holes for fixed supports based on the size of collision bolts. Generally, 10mm expansion bolts are used to drill 14mm holes.

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　　Guidelines for Automated Monitoring Operations of Subway (Existing Line)

　　3. Bracket installation

　　The bracket is divided into expansion bolts, screw rods, and frame bodies. The frame body is fixed to the tunnel wall with expansion bolts, and then the screw rod is fixed to the bracket by extending half of its length (for easy adjustment of height later).

　　4. Fix the iron pipe of Shaanxi Hengrui HR8066 static level on the already fixed bracket, pay attention; The fixed position of the iron pipe should be at

　　The middle part of the screw rod is convenient for adjustment after watering.

　　5. Wiring layout and installation, water pipe connection

　　(1) Wiring layout and installation: Wires should be cut into corresponding distances according to the spacing between measuring points, with a distance greater than two meters between measuring points for future reference

　　Not long enough, first connect the measuring points of the Shaanxi Hengrui HR8066 static level to the reference point, and then connect each measuring point in series. Disconnect the tee and sensor data line at the measuring point. five

　　Manual for Automated Monitoring Operation of Subway (Existing Line)

　　(2) Water pipe connection

　　The water pipe connection is similar to the wire connection, with one difference being the disconnection at the turning point. When installing the water pipe on the tank, it is difficult to install. You need to bring your own hot water and boil it on the street for 10 seconds before connecting it. When cutting the water pipe, be sure to cut the interface neatly, otherwise water leakage will occur. six

　　Manual for Automated Monitoring Operation of Subway (Existing Line)

　　5. Water tank filling and leveling: Water tank filling requires a built-in water pump and water bucket, leaving a pipe connected to the water pump for sequential filling

　　Water, the filling pressure should not be too high to prevent air bubbles from entering. Ensure that there is always water in the bucket to prevent the water pump from sucking in air.

　　When adjusting the water level in the water tank, which tank has more water and can be lifted online, while the water level decreases.

　　6. The data collection box is installed in the communication channel and fixed to the wall with expansion bolts.

　　4、 Safety assurance measures and precautions

　　1. Precautions for monitoring in subway lines

　　In order to strengthen the safety management of construction sites, ensure the safety of national property and workers, and make the safety management of construction sites legal, standardized, regulated, and procedural. The following regulations are made, and safety operation briefing must be strictly conducted before construction.

　　1) Subway monitoring personnel should complete the registration with the operation management company in advance and maintain a fixed position as much as possible, and regularly receive ideological education and operational training. When there is a homework point, the personnel for the day should be confirmed with the operation management company before 4:00 pm on the same day, and no replacement is allowed after confirmation.

　　2) Set up part-time safety officers during the monitoring process, assign responsibilities to individuals, and remind monitoring personnel to pay attention to line safety and personal safety.

　　3) Regularly provide safety education and training to monitoring and measuring personnel, enhance their safety awareness, and eliminate safety hazards.

　　4) Monitoring personnel must notify the operations manager of their work schedule and obtain approval from the manager before entering the site. After confirming that all personnel and items have been counted, they must leave the site uniformly.

　　5) Monitoring personnel entering the site must obey the command of the management personnel of the operating unit and are strictly prohibited from traveling in orbit

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　　Manual for Automated Monitoring Operation of Subway (Existing Line)

　　Smoking, urination, and other uncivilized behaviors occur in the area. During on-site operations, lighters, music headphones, and other items unrelated to monitoring operations are not allowed to be carried.

　　6) Without approval, monitoring personnel are not allowed to move or operate subway equipment on site, and are not allowed to pull power lines without authorization.

　　7) According to the arrangement of the Daxing Line subway operating unit, after obtaining permission, work must be strictly started and ended according to the prescribed time. When working in the track area, personnel are not allowed to walk around freely.

　　8) The project leader should stick to the site during the layout of the measuring points. After the layout of the measuring points, there should be a dedicated person to inspect and sign to confirm that the measuring points, lines, and equipment must not intrude into the driving limit.

　　9) When withdrawing from the subway, the number of people and equipment should be counted to avoid accidents.

　　10) Monitoring personnel should wear reflective vests and insulated shoes during monitoring work. When setting up measuring points, they should also wear safety helmets, goggles, and insulated gloves that meet the requirements. Other tools used should also have insulation properties.

　　11) Operators should dress uniformly as much as possible, and it is strictly prohibited to wear open toed shoes, cropped pants, etc. when entering the track area. Backpacks should be worn diagonally.

　　12) When monitoring personnel climb high, they should use sturdy and reliable insulated ladders and should not step on inclined wooden boards or boxes;

　　13) During drilling operations, useless holes should be promptly sealed and repaired, and efforts should be made to restore them to their original state as much as possible after the monitoring period ends.

　　2. Implementation of safety responsibilities

　　Develop a work safety responsibility system, clarify the authority and responsibility system of project leaders, full-time safety officers, etc., implement safety work at all levels, establish a hierarchical reporting system, and enhance rapid response capabilities.

　　The full-time safety officer arranges the safety of daily monitoring and measurement work on site, and conducts safety briefing work. Under normal safety work conditions, report the safety status of work every week, report emergency situations immediately, and prepare to implement emergency plans.

　　The project leader shall arrange the safety work for monitoring and carry out the safety work on the construction site

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　　Manual for Automated Monitoring Operation of Subway (Existing Line)

　　Inspect and spot check, organize emergency personnel in case of emergency, activate emergency plans, and report immediately.

　　5、 Measurement point protection measures

　　1. After the completion of the measurement point layout, mark the measurement point information, contact person, contact information and other information at the measurement point location to prevent damage by other personnel.

　　2. When making the measuring points, attention should be paid to placing them in positions that are not touched, and clear identification signs should be set up. The size of the signs should be uniform, about the size of a business card. If conditions permit, they should be sealed with plastic

　　Conduct monthly inspections and replace as necessary.

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• Case study of static level