Composite characteristic monitoring system applied to hydraulic structure of LNG (liquefied natural gas) wharf
By installing a composite characteristic monitoring system at the LNG terminal and using a pressure differential static level, stress strain gauges, and accelerometers for real-time data collection and analysis, the real-time and accuracy issues of traditional monitoring methods were resolved, and full-process monitoring of the terminal's structural health status and low-cost long-term operation were achieved.
Patent Information
- Application Number
- CN202422819101.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-11-19
AI Technical Summary
Traditional methods of monitoring the structural characteristics of docks make it difficult to achieve real-time monitoring of the entire process, and manual measurements have low accuracy and poor timeliness, making it impossible to accurately reflect the settlement and displacement of the dock.
A composite feature monitoring system is adopted, including a monitoring equipment unit, a signal transmission system and a monitoring data platform. A pressure differential static level, a stress strain gauge and an acceleration sensor are used for real-time data collection and analysis. The equipment is protected by an explosion-proof system, and the data is transmitted to the monitoring data platform in real time for processing and display.
It realizes real-time and intuitive monitoring of the dock's settlement, deformation and vibration, reduces human errors, and the equipment is corrosion-resistant and impact-resistant, simple and low-cost to install, and can be maintenance-free for a long time. The monitoring period covers the entire construction and operation process.
Smart Images
Figure CN223426009U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of health monitoring of hydraulic structures at docks, and in particular relates to a composite characteristic monitoring system applied to hydraulic structures at LNG docks. Background Art
[0002] LNG terminals are special hydraulic structures for loading and unloading ultra-cold LNG fluids. They play a key role in accommodating LNG transport ships for docking and unloading operations, and in transporting LNG to shore. Since the terminal and approach bridge structures are subjected to the long-term influence of the marine dynamic environment, the corrosive environment, and the berthing load, and due to the special safety requirements of LNG terminals, the reliability, durability, and integrity of the terminal structures and related facilities become particularly important. Therefore, the reliability analysis and judgment of its structural facilities and the integrity management are crucial to the long-term stable operation and healthy life extension of the terminal. In order to ensure that the terminal structure has sufficient strength to support the work, the health status of the terminal is analyzed and determined, and the characteristic parameters such as terminal settlement, deformation, and vibration can be obtained in real time and all day long. These are the key points of gravity terminal quality health monitoring.
[0003] Traditionally, dock structural characteristics have been monitored manually on a regular basis. This involves setting up observation points on the foundations and superstructures of gravity dock caissons and blocks, and using traditional measuring instruments to observe these observation points to reflect changes in the hydraulic structure characteristics of the dock. However, this traditional measurement method makes it difficult to monitor the entire dock in real time. Furthermore, due to the limitations of manual measurement, the settlement and displacement data collected is subject to human error and cannot accurately and promptly reflect the settlement and displacement of the dock piers. Utility Model Content
[0004] The purpose of this utility model is to provide a composite characteristic monitoring system for hydraulic structures of LNG terminals, which effectively solves the problems that traditional measurement methods are difficult to monitor the entire terminal in real time and the manual measurement has low accuracy and poor timeliness.
[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a composite characteristic monitoring system applied to the hydraulic structures of the LNG terminal, including a monitoring equipment unit, a signal transmission system and a monitoring data platform. The monitoring equipment unit is electrically connected to the signal transmission system, and the signal transmission system is communicatively connected to the monitoring data platform. The signal transmission system collects, parses and stores the data collected by the monitoring equipment unit, and transmits the data to the monitoring data platform in real time, and the monitoring data platform processes, analyzes, stores, displays and publishes the data.
[0006] The monitoring device unit comprises a differential pressure static hydrostatic level for measuring settlement, a stress strain gauge for measuring structural deformation and an acceleration sensor for measuring water structure vibration, the differential pressure static hydrostatic level is installed on the top plane of the approach bridge pier, the mooring pier and the berthing pier, the stress strain gauge is installed on the side surface near the top of the mooring pier, the berthing pier and the berthing pier, and the acceleration sensor is installed on the side surface of the top of the berthing pier and the top plane of the berthing pier and the mooring pier, the measurement direction of the acceleration sensor installed on the berthing pier is the direction of the coming ship, and the measurement direction of the acceleration sensor installed on the berthing pier and the mooring pier is the vertical coming ship direction of the coming ship direction and the non-gravity direction.
[0007] Further, an explosion-proof system for equipment corrosion and explosion-proof treatment is further included, the explosion-proof system comprises an explosion-proof shell for isolating the equipment from the external environment, the explosion-proof shell is a hollow shell processed by using an explosion-proof material, the explosion-proof shell is arranged on the outer surfaces of the monitoring device unit, the outer surfaces of the connecting pipelines between the equipment and the signal transmission system, and interfaces for pipeline access are reserved on the explosion-proof shell.
[0008] Further, the monitoring nodes of the differential pressure static hydrostatic levels constitute a serial system.
[0009] Further, the signal transmission system comprises a vibrating string acquisition instrument, a dynamic acquisition card, a switch and an industrial computer, the stress strain gauge outputs an analog signal and is connected with the vibrating string acquisition instrument for signal transmission, the differential pressure static hydrostatic level and the acceleration sensor both output digital signals and transmit signals through a wire harness in series, the signals of the stress strain gauge, the differential pressure static hydrostatic level and the acceleration sensor are transmitted to the industrial computer through the switch, and the industrial computer is arranged in a control room of the LNG wharf.
[0010] Further, the acceleration sensor comprises a single-axis acceleration sensor and a double-axis acceleration sensor, the single-axis acceleration sensor is arranged on the berthing pier, and the double-axis acceleration sensor is arranged on the berthing pier and the mooring pier.
[0011] Compared with the prior art, the beneficial technical effects of the utility model are that: (1) the utility model displays the overall settlement displacement condition, the structural deformation condition and the wharf structure vibration condition in real time through the monitoring data platform in the form of a chart, is not only intuitive but also reduces the links of manual data collection and processing, and avoids the error of manual data processing.
[0012] (2) the utility model processes the equipment through the explosion-proof system, makes the whole monitoring system corrosion-resistant and impact-resistant, the equipment is simple to install, can be maintained for a long time, and has low use cost.
[0013] (3) The monitoring cycle of the utility model involves the entire process of the base bed and subsequent construction, which can intuitively reflect the health status of the terminal at all stages and processes of construction and operation, with comprehensive data and high traceability. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the connection structure of the composite feature monitoring system of the present utility model. DETAILED DESCRIPTION
[0015] Example 1: A composite characteristic monitoring system applied to hydraulic structures of LNG terminals includes a monitoring equipment unit, a signal transmission system, a monitoring data platform and an explosion-proof system, such as Figure 1 As shown, the monitoring equipment unit is electrically connected to the signal transmission system, and the signal transmission system is communicatively connected to the monitoring data platform. The signal transmission system collects, analyzes and stores the data collected by the monitoring equipment unit, and transmits the data to the monitoring data platform in real time. The monitoring data platform processes, analyzes, stores, displays and publishes the data.
[0016] The monitoring equipment unit includes a pressure differential static level for measuring settlement, a stress strain gauge for measuring structural deformation, and an accelerometer for measuring vibration of hydraulic structures. The pressure differential static level is a two-in-one device for measuring tilt and settlement, capable of measuring factors such as relative settlement between piers and uneven settlement of individual piers. The stress strain gauge measures the deformation of piers under environmental loads and the impact of docking ships. The accelerometer measures the forced vibration of piers and bridges under external forces.
[0017] The dock is named according to the nature of the pier work. The system monitoring objects include approach piers, mooring piers, mooring piers, mooring piers, working platforms, etc. Different monitoring equipment is used according to the different characteristics of the monitored hydraulic structures. (1) For the settlement problem, the main objects are approach piers, mooring piers and mooring piers. The pressure differential static level is installed on the top plane of the approach piers, mooring piers and mooring piers. The monitoring nodes of each pressure differential static level form a series system. First, the bridge pier closer to the shore is selected to set the pressure differential static level reference base point. Assuming that the possibility of settlement of the bridge pier is extremely small, the monitoring nodes are connected in series through air pipes and liquid pipes. By setting up a liquid storage tank every 200m, each pressure differential static level is stabilized in normal working conditions, and each liquid storage tank must be 2m higher than the pressure differential static level. The relative settlement is measured by comparing the pressure difference with the reference base point. (2) Regarding the deformation problem, the main targets are the mooring piers, mooring piers and mooring piers. These structures may deform under the impact of the ship docking. Stress strain gauges are installed on the side of the mooring piers, mooring piers and mooring piers near the top, and two stress strain gauges are installed in a T-shape. (3) Regarding the vibration problem, the main targets are the mooring piers, mooring piers and mooring piers. These structures are the main force-bearing structures when the dock is working. Acceleration sensors are installed on the side of the top of the mooring piers and on the top plane of the mooring piers and mooring piers. The measurement direction of the acceleration sensor installed on the mooring pier is the direction of the incoming ship, and the measurement direction of the acceleration sensor installed on the mooring piers and mooring piers is the direction of the incoming ship perpendicular to the incoming ship except for the direction of the incoming ship and the non-gravity direction. In this embodiment, the acceleration sensor includes a uniaxial acceleration sensor and a biaxial acceleration sensor. The uniaxial acceleration sensor is set on the mooring pier, and the biaxial acceleration sensor is set on the mooring pier and mooring pier.
[0018] The signal transmission system includes a vibrating string collector, a dynamic acquisition card, a switch, and an industrial computer. In this embodiment, the industrial computer integrates data acquisition, data recording, and data transmission, and is the functional body of the signal transmission system. The monitoring data platform is deployed on a cloud server, and the industrial computer uses 4G network wireless communication to directly transmit data to the cloud server, which is efficient and cost-effective. The industrial computer transmits the signal wirelessly to the cloud server, and uses a bridge pier as a unit to collect combined data. The cloud server processes the data and displays the three characteristics of settlement, deformation, and vibration in the form of charts. At the same time, alarm thresholds are set to issue warnings when unreasonable data appears. The information can also be displayed on the user end via 4G / 5G network. The monitoring data platform can not only display charts of monitoring data during daily terminal operations to users through displays, but also provide warnings for areas with large changes in characteristic parameters through various methods such as the system homepage, mobile phone text messages, and emails, thereby realizing system interaction.
[0019] The stress strain gauge outputs an analog signal and connects to a vibrating wire data acquisition device for signal transmission. The differential pressure static level and accelerometer both output digital signals, and the two can be connected in series via a wiring harness. It is worth noting that the accelerometer outputs a high-frequency dynamic signal and requires a dynamic data acquisition card for data transmission. The signals from the stress strain gauge, differential pressure static level, and accelerometer are then transmitted via a switch to an industrial computer. The signals are then transmitted through the wireless communication module of the signal transmission system to the signal processing module of the cloud platform's backend server for processing. In this embodiment, the industrial computer is located in the control room of the LNG terminal.
[0020] The on-site facilities such as monitoring equipment units and signal transmission systems must all meet the explosion-proof requirements of the LNG terminal. The explosion-proof requirements are achieved through the explosion-proof system. On the one hand, it prevents the equipment from being corroded by high humidity and high salinity environments, and on the other hand, it prevents the electric sparks generated by the equipment during power supply and signal transmission from coming into contact with the external environment where LNG may exist. The explosion-proof system includes anti-corrosion measures and explosion-proof casings to isolate the equipment from the external environment. In this embodiment, the explosion-proof casing is a hollow shell made of explosion-proof materials, and the interior is processed according to the installation requirements of each monitoring equipment, such as threaded holes, clamps and other components. The top of the explosion-proof casing is designed to be detachable, and the four sides of the explosion-proof casing are sealed with rubber and reinforced with screws. This design also facilitates equipment installation and subsequent equipment maintenance. The explosion-proof casing is equipped with reserved interfaces for the entry and exit of signal lines, cables, and the air and liquid pipes required for the pressure differential static level. Flexible explosion-proof hoses are used at the interfaces. After the mixed wire harness is led out from each equipment monitoring node, the wire harness is laid out along the outside of the pier top, the outside of the bridge, the side of the roadway, etc. using wire conduits, in accordance with the principle of not affecting the normal operation of the terminal. Stainless steel is used to fix the wire conduit until it reaches the location of the switch.
[0021] In this embodiment, each monitoring object, such as the approach bridge pier, mooring pier, mooring pier, mooring pier, etc., can be analyzed through the data uploaded by the monitoring equipment installed thereon, and the structural condition can be analyzed through the three structural characteristic parameters of settlement, deformation and vibration.
[0022] The specific construction steps and precautions of the present invention are as follows: (1) Determine the installation location of the monitoring equipment and mark the equipment installation location according to the monitoring point drawing; (2) The bridge maintenance vehicle raises the hanging basket working platform. After the platform is in place, the operator wears a safety belt and life rope and wears a life jacket, and then enters the hanging basket through the maintenance platform route to start drilling operations; (3) The explosion-proof electric drill drills holes according to the installation location, and the drilling depth is 2-4 cm. After the drilling is completed, use an air blower to remove the dust in the hole and fill it with anchor glue; (4) Insert the expansion bolt into the hole, install the monitoring equipment and tighten it to fix it; (5) The signal line of the monitoring equipment passes through the explosion-proof flexible wire pipe and the wire pipe, and the wire pipe is fixed with bolts; (6) After the equipment is installed and the wire is threaded, structural glue is applied to the exposed expansion bolts and joints for corrosion protection and fixation.
[0023] The utility model provides the following fixed installation and protection methods for the lines and pipelines: (1) The lines of the approach pier equipment involve the connecting liquid pipes, gas pipes and signal lines of the pressure differential static level, and adopt the dual protection method of explosion-proof flexible line pipes and bridge frames. The explosion-proof flexible line pipes provide support for line protection, and the bridge frames provide fixed safety for the pipelines. Each section of the bridge frame is fixed with 3 sets of angle irons, and the angle irons and the box beam surface are fixed with stainless steel expansion bolts. After the fixed installation is completed, the surface of the hole is coated with structural glue for anti-corrosion protection; (2) The lines of the mooring pier equipment involve the signal lines of stress strain gauges, pressure differential static level and acceleration sensor. According to the actual conditions on site and to reduce the influence on the mooring and unmooring of ships, all lines are in line with the direction of the wall corners and are protected by explosion-proof flexible line pipes; (3) The lines of the mooring pier equipment involve stress strain gauges (4) Signal lines of stress strain gauges and acceleration sensors involved in mooring equipment lines are protected by galvanized pipes. The lines are also in line with the corners of the main structure, and the on-site bridge is used as much as possible to reduce the impact on the mooring and unmooring of ships; (5) For formal power lines, the combined working current of all collection boxes is 50W, and the current of a single line does not exceed 40W. The cable line adopts the national standard three-core armored cable. When the line leaves the distribution room and distribution box, it is protected by a bridge and explosion-proof flexible wire pipe according to the actual situation. The bridge connection and the bridge end are grounded to ensure power safety.
[0024] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.
Claims
1. A composite characteristic monitoring system for hydraulic structures at LNG terminals, characterized by: It includes a monitoring device unit, a signal transmission system and a monitoring data platform. The monitoring device unit is electrically connected to the signal transmission system, and the signal transmission system is communicatively connected to the monitoring data platform. The signal transmission system collects, parses and stores data collected by the monitoring device unit, and transmits the data to the monitoring data platform in real time. The monitoring data platform processes, analyzes, stores, displays and publishes the data; The monitoring equipment unit includes a pressure differential static level for measuring settlement, a stress strain gauge for measuring structural deformation, and an acceleration sensor for measuring vibration of the hydraulic structure. The pressure differential static level is installed on the top plane of the approach bridge pier, mooring pier and mooring pier, the stress strain gauge is installed on the side of the mooring pier, mooring pier and mooring pier near the top, and the acceleration sensor is installed on the side of the top of the mooring pier and the top plane of the mooring pier and mooring pier. The measuring direction of the acceleration sensor installed on the mooring pier is the direction of the incoming ship, and the measuring direction of the acceleration sensor installed on the mooring pier and mooring pier is the direction of the incoming ship perpendicular to the non-gravity direction.
2. The composite characteristic monitoring system for LNG terminal hydraulic structures according to claim 1 is characterized in that: It also includes an explosion-proof system for equipment corrosion protection and explosion-proof treatment. The explosion-proof system includes an explosion-proof casing for isolating the equipment from the external environment. The explosion-proof casing is a hollow shell made of explosion-proof material. The explosion-proof casing is arranged on the outer surface of each device in the monitoring equipment unit, the outer surface of the connecting pipelines between devices and between devices and the signal transmission system. The explosion-proof casing is reserved with an interface for the entry and exit of pipelines.
3. The composite characteristic monitoring system for LNG terminal hydraulic structures according to claim 2 is characterized in that: The monitoring nodes of the differential pressure static level instruments form a series system.
4. The composite characteristic monitoring system for LNG terminal hydraulic structures according to claim 3 is characterized in that: The signal transmission system includes a vibrating string collector, a dynamic acquisition card, a switch and an industrial computer. The stress strain gauge outputs an analog signal and is connected to the vibrating string collector for signal transmission. The differential pressure static level and the acceleration sensor both output digital signals and the two transmit signals in series through a wiring harness. The signals of the stress strain gauge, the differential pressure static level and the acceleration sensor are transmitted to the industrial computer through the switch. The industrial computer is arranged in the control room of the LNG terminal.
5. The composite characteristic monitoring system for LNG terminal hydraulic structures according to claim 4 is characterized in that: The acceleration sensor includes a uniaxial acceleration sensor and a biaxial acceleration sensor. The uniaxial acceleration sensor is arranged on the mooring pier, and the biaxial acceleration sensor is arranged on the mooring pier and the mooring pier.