CN109632122B - Automatic temperature measurement system for rope strands of suspension bridge and temperature measurement and control platform of Internet of things comprising automatic temperature measurement and control system - Google Patents
Automatic temperature measurement system for rope strands of suspension bridge and temperature measurement and control platform of Internet of things comprising automatic temperature measurement and control system Download PDFInfo
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Abstract
The invention discloses an automatic temperature measuring system for a cable strand of a suspension bridge, which is used for measuring temperatures of different positions of a main cable strand of the suspension bridge, wherein the suspension bridge comprises a suspension cable (1), a cable tower (2), an anchorage (3), a suspender (4) and a bridge deck (5). The automatic temperature measurement system of the suspension bridge strand comprises a temperature measurement device (11) and a data acquisition control device (12), wherein the temperature measurement device (11) comprises a temperature measurement probe, a temperature control module, a Lora wireless transmission module and a first power supply; the data acquisition control device (12) can perform unified normalization processing on the data information of the temperature measuring device (11) and can store the acquired temperature information into the background database. The Jiang Suo strands are divided into 9 sections for monitoring, wherein each strand section monitors 5 temperature values, and measurement accuracy and reliability are guaranteed. The invention has the technical effect of accurately measuring the temperature of the strand of the suspension bridge.
Description
Technical Field
The invention relates to an automatic temperature measurement system for a cable strand of a suspension bridge, and also relates to an internet of things temperature measurement and control platform comprising the system.
Background
Suspension bridge
Suspension bridges, also known as suspension bridges (suspension bridge), refer to bridges having cables (or steel chains) suspended by cable towers and anchored to both sides (or ends of the bridge) as the primary load-bearing members of the superstructure. The cable geometry is determined by the equilibrium conditions of the forces, typically approaching a parabola. A plurality of hanging rods hang from the cable, so as to hang the bridge deck, stiffening girders are arranged between the bridge deck and the hanging rods, and a combined system is formed by the hanging rods and the cable, so that deflection deformation caused by load is reduced.
The maximum forces in the suspension bridge are the tension in the suspension ropes and the pressure in the tower. Since the tower is substantially free from lateral forces, its structure can be made quite slim, and the suspension cable has a certain stabilizing effect on the tower. If the weight of the suspension cable is ignored during the calculation, the suspension cable forms a parabola. The process of calculating the suspension bridge becomes very simple. The suspension wires of the old suspension bridge are typically iron chains or iron rods connected together. Modern suspension ropes are typically multi-strand high strength steel wires.
The construction of suspension bridges was invented in the beginning of the 19 th century, and many bridges used this construction. Modern suspension bridges have evolved from rope bridges. The application range is mainly large-span and super-span highway bridges, and the structure is adopted by the current large-span highway bridges. Is the main form of the bridge with large span.
The suspension bridge is a bridge using cable or chain rope bearing tension as main bearing member, and is formed from suspension rope, cable tower, anchorage, suspender and bridge deck system. The main load-bearing member of the suspension bridge is a suspension cable, which mainly bears tensile force and is generally made of steel materials (steel wires, steel cables and the like) with high tensile strength. The suspension bridge can fully utilize the strength of materials and has the characteristics of material saving and light dead weight, so that the suspension bridge has the largest spanning capacity in various system bridges, and the span can reach more than 1000 meters.
Rope strand
The strand is a common product for bridge construction of a suspension bridge and is used for bearing the weight of the bridge.
Strand temperature
In bridge construction, the sunlight temperature difference in the cable strand installation process affects the whole construction stage of the suspension bridge, and the excessive temperature difference can cause larger deviation between coordinates of the cable tower and the main cable and coordinates of the main cable at the design reference temperature, so that the sag and the linear deviation of the whole main cable from the design value are affected.
The temperature effect is accurately analyzed, the change value of the strand line shape of the main cable caused by temperature change is monitored and adjusted in real time, and the method plays an extremely important role in ensuring the erection precision of the main cable. The main cable line shape of the suspension bridge is quite sensitive to temperature change, and strict temperature test and accurate calculation correction are key for ensuring the erection precision of the main cable.
Temperature gradient
The temperature gradient (temperature gradient) is a stepwise increasing or decreasing phenomenon that occurs in the natural world when the temperature of air, water or soil changes with the land height or the water area or the soil depth. Is a physical quantity that describes in what direction the most rapid change in temperature will be within a particular regional environment, and what rate.
The temperature gradient is a one-dimensional number in degrees celsius (degrees fahrenheit) per unit length (within a specific temperature range) and in SI units of K per meter (K/m). The temperature gradient is a vector, and the direction in which the temperature increases is generally taken as the positive direction.
Temperature measuring device
The temperature measuring instrument can be divided into two main types of contact type and non-contact type according to the temperature measuring mode.
In general, the contact type temperature measuring instrument is simple and reliable, and has higher measuring precision; however, since the temperature measuring element and the measured medium need to perform sufficient heat exchange, a certain time is required for achieving heat balance, so that the temperature measurement delay phenomenon exists, and the temperature measuring device is limited by high temperature resistant materials and cannot be applied to very high temperature measurement.
The non-contact instrument measures temperature by a heat radiation principle, the temperature measuring element does not need to be in contact with a measured medium, the temperature measuring range is wide, the temperature measuring device is not limited by the upper limit of temperature measurement, the temperature field of a measured object is not damaged, and the reaction speed is generally higher; but is influenced by external factors such as emissivity of an object, measurement distance, smoke dust, water vapor and the like, and the measurement error is larger.
LoRa wireless communication
LoRa is one of LPWAN communication technologies, and is an ultra-long-distance wireless transmission scheme based on spread spectrum technology adopted and promoted by Semtech company in the United states. The scheme changes the prior compromise mode about transmission distance and power consumption, provides a simple system which can realize long distance, long battery life and large capacity for users, and further expands the sensing network. Currently, loRa operates mainly in the global free frequency band, including 433, 868, 915MHz, etc.
The LoRa technology has the characteristics of long distance, low power consumption (long battery life), multiple nodes and low cost.
The LoRa wan is a low power wide area network (Low Power Wide Area Network, LPWAN) standard based on the open source MAC layer protocol introduced by the LoRa alliance. This technique may provide a local, national, or global network for battery-powered wireless devices. LoRaWAN aims at some core demands in the Internet of things, such as services of safe two-way communication, mobile communication, static position identification and the like. The technology can realize seamless butt joint interoperation between intelligent devices without local complex configuration, and gives users, developers and enterprises free operation rights in the field of the Internet of things.
The LoRaWAN network architecture is a typical star topology, in which the LoRa gateway is a transparent transport relay, connecting the end devices and the backend central server. The gateway and the server are connected through standard IP, and the terminal equipment communicates with one or more gateways by adopting single hop. All nodes and the gateway are in bidirectional communication, and operations such as cloud upgrading are supported to reduce cloud communication time.
LoRa provides a link budget of 168dB at maximum with its proprietary technology. Generally, the wireless distance range in cities is 1-2 km, and the wireless distance can reach up to 20km in suburban areas.
Patent document CN107687909a discloses an intelligent internet-of-things-based cable temperature monitoring system, a temperature collector corresponds to a group of RFID temperature tags, each RFID temperature tag in each group of RFID temperature tags is respectively arranged at a monitoring point position of a cable to be tested, a through hole is formed in the middle of a flexible insulating substrate, a heat conducting metal block is embedded in the through hole, a temperature measuring chip is in contact with the heat conducting metal block, the temperature measuring chip is connected with an ultrahigh frequency RFID chip, an antenna is connected with the ultrahigh frequency RFID chip, and the antenna is positioned on the flexible insulating substrate; the antenna in each RFID temperature label in each group of RFID temperature labels is connected with the corresponding temperature collector, the output end of each temperature collector is connected with the convergence controller, and the system can realize passive wireless temperature monitoring of the cable in the channel.
Patent document CN207050867U discloses a temperature alarm device based on the transmission technology of the LoRa internet of things, which comprises a plurality of LoRa gateway routers, a temperature alarm management host, a mobile phone base station, a temperature alarm management user and a plurality of temperature alarm and LoRa communication devices which are deployed inside the measured object. The temperature alarm and LoRa communication device comprises a control module, a temperature detection module, a LoRa communication module, a power module and a voice alarm module, wherein the temperature alarm and LoRa communication device is arranged in the whole area and inside the measured object. The utility model has the technical effects that: the temperature alarm device has the advantages that the structure is simple, the temperature alarm function based on the LoRa internet of things transmission technology is economically and practically realized, the low-cost large-scale deployment can be met, and the temperature alarm device can be applied to long-distance and low-power consumption scenes.
Patent document CN101393576a discloses a method for eliminating the influence of cable adjusting temperature and temporary load of a cable-stayed bridge, which relates to a stay cable force adjusting technology, in particular to a method for eliminating the influence of cable adjusting temperature and temporary load. The cable length difference is used as a cable adjusting basis, the concrete steps are that the cable length, the cable force and the elastic elongation of the Cn-shaped stay cable before cable adjustment are calculated, the original length before cable adjustment is obtained by subtracting the elastic elongation from the length of the stay cable, the original length of the Cn-shaped stay cable of the cable-stayed bridge after cable adjustment is calculated, the original length difference of the stay cable is obtained by subtracting the original length before and after adjustment, and the original length difference is used as the pulling-out amount or the retracting amount of the Cn-shaped stay cable to adjust the cable. According to the utility model, the precision of the stay cable adjustment can be ensured under the condition of on-site temperature and temporary load change. The utility model solves the problem that the temperature and the temporary load generate errors for adjusting the cable force, and can filter the errors generated by the temperature field and the temporary load change of the construction site for adjusting the cable force.
Technical problem
And accurately measuring the temperature of each measurement and control point of the main cable strand.
The strand is a common product for bridge construction of a suspension bridge and is used for bearing the weight of the bridge. In bridge construction, the sunlight temperature difference in the cable strand installation process affects the whole construction stage of the suspension bridge, and the excessive temperature difference can cause larger deviation between coordinates of the cable tower and the main cable and coordinates of the main cable at the design reference temperature, so that the sag and the linear deviation of the whole main cable from the design value are affected.
Accurately analyzes the temperature effect, monitors and adjusts the change value of the strand shape of the main cable caused by the temperature change in real time,
has extremely important function for guaranteeing the erection precision of the main cable. The main cable line shape of the suspension bridge is quite sensitive to temperature change, and strict temperature test and accurate calculation correction are key for ensuring the erection precision of the main cable.
Disclosure of Invention
Therefore, the invention provides an automatic temperature measuring system for the strand of the suspension bridge, which can accurately analyze the temperature effect and monitor and adjust the change value of the strand line shape of the main cable caused by temperature change in real time.
To this end, the invention proposes an automatic measuring system for the temperature of the strands of a suspension bridge for measuring the temperature of different positions of the main strands of a suspension bridge comprising a suspension cable, a cable tower, an anchorage, a boom, and a deck, wherein the deck is connected to the suspension cable by the boom, the two ends of the suspension cable being fixed to the anchorage and supported by the cable tower so as to be able to suspend the deck on a river;
The automatic temperature measuring system of the suspension bridge strand comprises a temperature measuring device and a data acquisition control device, wherein,
the temperature measuring device comprises a temperature measuring probe, a temperature control module, a Lora wireless transmission module and a first power supply; the temperature measuring probe is electrically connected with the temperature control module, and an electric signal measured by the temperature measuring probe is converted into temperature information by the temperature control module; the Lora wireless transmission module is electrically connected with the temperature control module, and can transmit the temperature information to the data acquisition control device in a Lora wireless communication mode; the first power supply can provide electric energy for the temperature control module and the Lora wireless transmission module;
the data acquisition control device can perform unified standardization processing on the data information of the temperature measurement device, can be connected with a background database of the temperature measurement and control platform of the Internet of things, and can store the acquired temperature information into the background database, so that the temperature information data can be provided for a client program of the temperature measurement and control platform of the Internet of things;
the automatic temperature measuring system for the suspension bridge strands measures the temperature of the suspension bridge strands in the following manner:
Selecting the cross section positions of N main cable strands in the length direction of a main cable of the suspension bridge as a temperature measurement section, wherein N is a positive integer greater than 3;
selecting a temperature measuring point as a reference temperature measuring point on the periphery of each temperature measuring section of the main cable strand, and providing one of the temperature measuring devices, referred to as a reference temperature measuring probe, wherein the reference temperature measuring probe is fixed on the reference temperature measuring point for measuring temperature information of the reference temperature measuring point;
selecting M temperature measurement points, namely cross-section temperature measurement points, on the periphery of the cross section of the main cable strand at set intervals by taking the reference temperature measurement points as base points, wherein M is a positive integer greater than or equal to 1, and setting a temperature measurement device, namely a cross-section temperature measurement probe, for each cross-section temperature measurement point, wherein each cross-section temperature measurement probe is fixed on the corresponding cross-section temperature measurement point and is used for measuring the temperature information of the cross-section temperature measurement point;
the Lora wireless transmission module of each temperature measurement device can transmit the measured temperature information to the data acquisition control device;
And meanwhile, temperature measurement is carried out on M+1 temperature measurement points of the cross section positions of the N main cable strands, and all measured temperature information is stored into a background database of the temperature measurement and control platform of the Internet of things through the data acquisition control device.
And fitting a temperature distribution curve of the main cable strand of the suspension bridge according to the whole temperature information by means of an interpolation calculation method.
Therefore, the invention provides the temperature measurement and control platform of the Internet of things, which can collect temperature information and transmit the temperature information to a background database of the temperature measurement and control platform of the Internet of things through the technology of the Internet of things; and at the WEB application client, simulating and displaying the temperature distribution of the main cable strand of the suspension bridge, and remotely determining the timing of cable adjustment.
Therefore, the invention provides an Internet of things temperature measurement and control platform, which comprises a data sensing front-end system, a data transmission middle-end system, a data analysis background system and a simulation application terminal system;
the data perception front-end system can collect various information data of the object by means of an Internet of things sensor through an Internet of things low-power consumption wide area network communication mode;
the data transmission middle-end system is a wired or wireless internet and can transmit the information data to the data analysis background system;
The simulation application terminal system can extract the information data from the data analysis background system, and display the information data and the analysis result thereof on a computer screen in an object simulation mode so as to realize remote monitoring of the object;
the method is characterized in that:
the data sensing front-end system comprises the automatic temperature measuring system for the cable strands of the suspension bridge according to any one of claims 1 to 8, wherein the automatic temperature measuring system collects temperature information data of the cable strands of the suspension bridge, and the data acquisition control device transmits the temperature information data to the data analysis background system in a mobile or wired internet communication mode of the data transmission middle-end system;
the data analysis background system comprises a suspension bridge strand temperature database, wherein the suspension bridge strand temperature database comprises a strand temperature data table, and the suspension bridge strand temperature data table at least comprises strand numbers, measurement time and measurement temperature data fields, and the temperature data fields are used for storing the temperature information data; judging whether cable adjusting operation can be performed according to the temperature information data and preset cable adjusting conditions;
The simulation application terminal system comprises a suspension bridge simulation graphical interface, wherein the suspension bridge simulation graphical interface comprises a simulation image of the suspension bridge, a cross section position of temperature measurement is marked on the simulation image of the suspension bridge, the measurement time and the measurement temperature of each temperature measurement point of the same cross section are displayed in a pop-up window mode, whether a cable adjusting condition is met or not is reminded through images, colors or characters, and therefore a cable adjusting operation instruction is timely and remotely sent to a field operator.
The automatic temperature measuring system for the suspension bridge strand has the technical effects that:
● By means of a magnetic temperature probe, the temperature probe is held on the strand to be measured by means of magnetic attraction;
● The rechargeable battery is used for supplying power, so that the electric energy storage device can be used for a long time;
● Transmitting the temperature information to a background database of an Internet of things temperature measurement and control platform through a Lora wireless communication technology and an Internet technology;
● The Jiang Suo strands are divided into 9 sections for monitoring, wherein each strand section monitors 5 temperature values, and measurement accuracy and reliability are guaranteed.
The temperature measurement and control platform of the Internet of things has the technical effects that:
● The background database stores temperature information, and playback and analysis are called at any time;
● The WEB program simulation displays the position and the temperature distribution of the measurement and control points of the main cable strand of the suspension bridge;
● The linear regression interpolation improves the measurement accuracy of the temperature information;
● The computer algorithm automatically analyzes the temperature information and gives out a timing reminding according to a preset condition.
Drawings
The features, advantages, and characteristics of the present invention will be better understood from the following description of the embodiments with reference to the drawings, in which:
fig. 1: schematic diagram of the suspension bridge of the present invention;
fig. 2: another schematic view of the suspension bridge of the present invention, wherein the strands of the main cable of the suspension cable 1 are pulled by a puller;
fig. 3: the cable strand cross section schematic diagram of the main cable of the suspension bridge is shown in the specification;
fig. 4: one embodiment of the temperature measurement and control platform of the Internet of things is provided;
fig. 5: the invention relates to a diagram of a temperature measuring device of an automatic temperature measuring system of a suspension bridge strand;
fig. 6: the invention discloses a schematic diagram of an embodiment of an automatic temperature measuring system for a suspension bridge strand;
fig. 7: a schematic diagram of another embodiment of the automatic temperature measurement system for a strand of a suspension bridge of the present invention;
fig. 8: another schematic illustration of the suspension bridge of the present invention, wherein the locations of the aliquoting 9 temperature measurement sections are marked;
Fig. 9: another schematic illustration of the suspension bridge of the present invention, wherein the locations of 11 temperature measurement sections are marked;
fig. 10: the cross-section schematic diagram of the main cable of the suspension bridge of the invention;
fig. 11: the temperature data monitoring interface of the simulation application terminal system of the temperature measurement and control platform of the Internet of things is provided;
fig. 12: the invention discloses an architecture schematic diagram of an Internet of things temperature measurement and control platform;
fig. 13: the simulation application terminal system of the temperature measurement and control platform of the Internet of things comprises a screen interface of a simulation image of the suspension bridge;
fig. 14: the three terminal screen graphical interfaces of the simulation application terminal system of the temperature measurement and control platform of the Internet of things are provided;
fig. 15: the invention relates to a temperature data management interface of a simulation application terminal system of an Internet of things temperature measurement and control platform.
Detailed Description
The present invention will be further described with reference to the drawings and detailed description hereinafter, wherein it should be noted that any combination of the embodiments or technical features described in the following description may be used to form new embodiments, provided that the technical content of the combination has no logical contradiction or error.
According to an embodiment of the automatic temperature measuring system for a strand of a suspension bridge according to the present invention, for measuring temperatures at different positions of a main strand of a suspension bridge, as shown in fig. 1, the suspension bridge includes a suspension rope 1, a rope tower 2, an anchorage 3, a boom 4, and a deck 5, wherein the deck 5 is connected to the suspension rope 1 through the boom 4, and both ends of the suspension rope 1 are fixed to the anchorage 3 and supported by the rope tower 2, thereby enabling the deck 5 to be suspended on a river. As shown in fig. 2, the suspension cable 1 comprises main cables, and fig. 2 shows the erection process of the main cables, wherein the main cables are composed of prefabricated parallel steel wire strands, and each main cable comprises a plurality of through long strands and a plurality of back cables. The cable strand 109 is moved forward by means of the hauling cable 112 and the hauler 114 through the payout gantry 101, the swiveling wheel 102, the east anchor 103, the east buttress gantry 104, the east catwalk gantry 105, the east overhead gantry 106, the middle catwalk gantry 108, the gantry load-bearing cable 111, the middle catwalk 113 towards the west overhead gantry 115, the west catwalk 117, the west buttress gantry 118, the west anchor 119, the hoist 120, wherein the east anchor 103, the east tower 107, the west tower 116, the west anchor 119 serve to support and secure the cable strand and the main cable formed by the cable strand. The main cables are vertically arranged to be approximately regular hexahedron with sharp peaks when being erected, and are round after being tightly fastened. Optionally, as shown in fig. 1, the suspension bridge further includes a suspension cable, one end of the suspension cable is connected to the top of the cable tower 2, and the other end of the suspension cable is connected to the bridge deck 5, so as to form a vertically upward tension on the bridge deck 5.
Referring to fig. 4, the automatic temperature measuring system for the strand of the suspension bridge comprises a temperature measuring device 11 and a data acquisition control device 12. It can be understood that, in the case that the automatic temperature measurement system for the strand of the suspension bridge includes a small number of temperature measurement devices 11, the data acquisition control device 12 is directly connected with all the temperature measurement devices 11 in a communication manner by using the Lora wireless communication manner, so as to control the acquisition of temperature information data. Under the condition that the number of the temperature measurement sections is numerous, a plurality of temperature measurement devices 11 are needed, a relay device is additionally arranged between the temperature measurement devices 11 and the data acquisition control device 12, the relay device comprises a plurality of Lora wireless communication relay modules, each Lora wireless communication relay module is in communication connection with a plurality of the temperature measurement devices 11 in a Lora wireless communication mode, and is in communication connection with the data acquisition control device 12 in the Lora wireless communication mode, so that temperature information data measured by the temperature measurement devices 11 are forwarded to the data acquisition control device 12.
Referring to fig. 5, the temperature measuring device 11 includes a temperature measuring probe, a temperature control module, a Lora wireless transmission module, and a first power supply; the temperature measuring probe is electrically connected with the temperature control module, and an electric signal measured by the temperature measuring probe is converted into temperature information by the temperature control module; the Lora wireless transmission module is electrically connected with the temperature control module, and can transmit the temperature information to the data acquisition control device in a Lora wireless communication mode; the first power supply can provide electric energy for the temperature control module and the Lora wireless transmission module. It will be appreciated that the temperature control module may be integrated in the temperature probe, as shown in fig. 4, or integrated in the Lora wireless transmission module, such a configuration being shown in fig. 4, the temperature probe being directly connected to the Lora wireless transmission module. Advantageously, the temperature control module comprises an analog-to-digital data conversion sub-module which converts the electrical signals measured by the temperature probe, i.e. the analog temperature signals, into data information, i.e. digital temperature information. If necessary, each of the temperature control modules may be connected to a plurality of the temperature measurement probes, for example, 6 temperature measurement probes arranged at the periphery of each temperature measurement section described below. Such an arrangement is advantageous in terms of cost savings. The temperature measuring probe is electrically connected with the temperature control module through a conductive wire, and the Lora wireless transmission module is electrically connected with the temperature control module through serial communication or RS485 communication. The first power source may be an alternating current power source and a first power adapter capable of converting the alternating current into direct current. The first power source may also be a direct current power source with a rechargeable battery, so that the temperature measuring device can be ensured to work normally without alternating current or with alternating current at a considerable distance.
The data acquisition control device 12 can perform unified normalization processing on the acquired temperature information data of the temperature measurement device 11, and can be connected with a background database of the temperature measurement and control platform of the internet of things, and store the acquired temperature information data in the background database, so that the temperature information data can be provided for a client program of the temperature measurement and control platform of the internet of things. It can be appreciated that the data acquisition control device accords with the LoRa network data transmission specification, for example, and can perform unified standardization processing on data information facing the sensing equipment of the Internet of things. That is, different data information such as temperature, distance, tension and the like are processed into a unified data packet format according to the format of the LoRa network data transmission specification, so that data exchange with the sensing equipment of the Internet of things is facilitated. And can encapsulate data according to internet communication protocol specifications such as TCP/IP so as to send data packets to a data analysis background system of the temperature measurement and control platform of the Internet of things.
Referring to fig. 3, 8 and 9, the automatic temperature measurement system for the suspension bridge strand measures the temperature of the suspension bridge strand as follows:
Referring to fig. 8 and 9, cross-sectional positions of N main cable strands are selected as temperature measurement sections along the length direction of the main cable of the suspension bridge, where N is a positive integer greater than 3. It will be appreciated that the number of temperature measurement sections N is mainly dependent on the length of the main cable and the measurement accuracy, for example, for a suspension bridge of length around 2000 meters, it is appropriate to take 9 to 11 temperature measurement sections.
Referring to fig. 3, a temperature measurement point is selected as a reference temperature measurement point on the outer circumference of each temperature measurement section of the main rope strand, and one of the temperature measurement devices, referred to as a reference temperature measurement probe, is provided, wherein the reference temperature measurement probe is fixed to the reference temperature measurement point for measuring temperature information of the reference temperature measurement point. It will be appreciated that for a suspension bridge of about 2000 meters in length, as shown in fig. 10, the main cable may include about 250 strands, each strand may include about 125 wires of about 5 millimeters in diameter, as shown in fig. 3, with strands up to 5 centimeters in diameter or more. As shown in fig. 3, a reference temperature measurement point, such as the location 50 of the reference strand 6, is selected on the strand circumference of approximately 18 cm in length. Optionally, two temperature measurement points are selected as reference temperature measurement points on the periphery of each temperature measurement section of the main cable strand, and the average value of the two temperature measurement points is taken as reference temperature.
Referring to fig. 3, M temperature measurement points, which are called cross-section temperature measurement points, are selected at set intervals on the outer circumference of the cross section of the main strand with the reference temperature measurement point as a base point, wherein M is a positive integer of 1 or more, and one of the temperature measurement devices, which are called cross-section temperature measurement probes, is provided for each of the cross-section temperature measurement points, wherein each of the cross-section temperature measurement probes is fixed to a respective corresponding cross-section temperature measurement point for measuring temperature information of the cross-section temperature measurement point. It will be appreciated that for strands of circumference about 18 cm, one temperature measurement point is selected per 3 cm, the number of total section temperature measurement points is thus 6, except for one reference temperature measurement point, the number of section temperature measurement points M is equal to 5, which are located as shown in fig. 3, first section temperature measurement point 51, first section temperature measurement point 52, first section temperature measurement point 53, first section temperature measurement point 54, and fifth section temperature measurement point 55. The number M of the strand section temperature measurement points mainly depends on the diameter and measurement accuracy of the strand, for example, 11 section temperature measurement points can be selected on the same temperature measurement section for the strand with the diameter of 5 cm to improve the measurement accuracy. The average temperature of the temperature measurement section is equal to the sum of the temperature values of the m+1 section temperature measurement points 51 to 55 and the reference temperature measurement point 50 and is then averaged.
Referring to fig. 4, the Lora wireless transmission module of each of the temperature measuring devices can transmit measured temperature information to the data acquisition control device. It will be appreciated that for suspension bridges of length around 2000 meters, lora wireless communication is sufficient without the need for relay communication equipment. Therefore, the Lora wireless transmission module of each temperature measurement device can transmit the measured temperature information to the data acquisition control device in a Lora wireless communication mode. The wireless communication mode can avoid the complicated wiring of the wired communication mode and save the cost.
And meanwhile, temperature measurement is carried out on M+1 temperature measurement points of the cross section positions of the N main cable strands, and all measured temperature information is stored into a background database of the temperature measurement and control platform of the Internet of things through the data acquisition control device. It will be appreciated that simultaneous measurements are relatively speaking, and that for tens or even hundreds of temperature measurement points, the transmission and storage of measurement data is time-consuming, and zero-time differential synchronization is not possible. For example, for the above-described measurement of 9 to 11 temperature measurement sections, all temperature data is to be presented in its entirety in the simulation application terminal system, including data acquisition, transmission, storage, sorting, analysis and processing, which may take 20 seconds.
And fitting a temperature distribution curve of the main cable strand of the suspension bridge according to the whole temperature information by means of an interpolation calculation method. It will be appreciated that interpolation methods are well established, with linear interpolation or non-linear interpolation, and can be categorized as Lagrange interpolation, newton interpolation, hermite interpolation, piecewise interpolation, and spline interpolation. By fitting is meant knowing the number of discrete function values f1, f2, …, fn of a function, by adjusting the number of coefficients f (λ1, λ2, …, λ3) to be determined in the function so that the difference of the function from the known point set is minimal, for example in the least squares sense. For example, for the above 9 to 11 temperature measurement sections, there may be 9 to 11 temperature data, and based on these temperature data, the temperature distribution curve of the main strand can be fitted by interpolation calculation.
Further, referring to fig. 11, in this example, the strand to be tuned has 11 temperature measurement sections each having 4 section temperature measurement points, the average temperature of each temperature measurement section of the strand to be tuned is calculated, then compared with the average temperature of each temperature measurement section of the reference strand, a difference is calculated, and then it is determined whether the tuning is possible based on the calculated difference.
Preferably, each temperature measuring device 11 includes four to six temperature measuring probes, a temperature control module, a Lora wireless transmission module, a first power supply, and a waterproof box. That is, one temperature control module collects temperature data of four to six temperature probes.
Optionally, each temperature measuring device 11 includes a temperature measuring probe, a temperature control module, a Lora wireless transmission module, a first power supply, and a waterproof box. That is, a temperature control module collects temperature data of a temperature probe.
Based on the technical scheme, the optimization of the rope-exchanging progress is achieved, and under the action of the automatic measuring system for the temperature of the rope strands of the suspension bridge, the maximum speed of 18 rope strands per night is achieved for the suspension bridge with the length of about 2000 meters, and the continuity of rope strand erection is ensured.
Referring to fig. 8, the number N of temperature measurement sections is equal to 9, and the 9 temperature measurement sections are uniformly distributed over the length of the main cable of the suspension bridge. Fig. 8 schematically marks the approximate locations 201 to 209 of the 9 temperature measurement sections.
Referring to fig. 3, the number M of the cross-section temperature measurement points is 5, which are a first cross-section temperature measurement point 51, a second cross-section temperature measurement point 52, a third cross-section temperature measurement point 53, a fourth cross-section temperature measurement point 54, and a fifth cross-section temperature measurement point 55, respectively, and the number M is 6 together with the reference temperature measurement point 50 of the same temperature measurement cross-section, and the 6 temperature measurement points are uniformly distributed on the outer circumference of the temperature measurement cross-section.
For this purpose, if a single temperature probe temperature measuring device is used, the temperature measuring device needs 54 sets in total. If a temperature measuring device with six temperature measuring probes is used, 9 sets of temperature measuring devices are needed.
Alternatively, one temperature measuring device is used for each temperature measuring section, wherein each temperature measuring device can be connected with 5 to 10 temperature measuring probes, and the configuration ensures that only 9 sets of temperature measuring devices are needed for 9 temperature measuring sections, thereby being beneficial to reducing the product cost.
For a suspension bridge with the length of about 2000 meters, the 9 temperature measurement sections in the technical scheme can ensure proper measurement precision, and the production cost of the automatic suspension bridge strand temperature measurement system is reasonable.
Preferably, the suspension bridge is set to east-west orientation. Such a setting is for convenience of description only, and the bridge may be oriented in virtually any direction. As shown in fig. 9, the number N of temperature measurement sections is equal to 11, and the 11 temperature measurement section positions are: east span near tieback 301, east span mid-span 302, east span near east tower 303, main span near east tower 304, three quarters of main span 305, main span mid-span 306, main span quarter 307, main span near west tower 308, west span near west tower 309, west span mid-span 310, and west span near tieback 311; the number of the section temperature measurement points M is 3 to 5, and 4 to 6 temperature measurement points are provided together with the reference temperature measurement points of the same temperature measurement section, and the 6 temperature measurement points are uniformly distributed on the outer periphery of the temperature measurement section.
If a single temperature probe temperature measuring device is used, the temperature measuring device needs 44 to 66 sets in total. If a temperature measuring device with four to six temperature measuring probes is used, 11 sets of temperature measuring devices are needed.
It will be appreciated that the exact location of the east-and-near-east tower 303 or the main-and-near-east tower 304 is not necessary, for example, the temperature measurement section may be as close to the east tower as possible, so long as the temperature measurement device can be installed, and therefore, the temperature information data at the two temperature measurement sections of the east-and-near-east tower 303 or the main-and-near-east tower 304 will not differ too much, and similarly, the temperature information data at the two temperature measurement sections of the main-and-near-west tower 308, west-and-near-west tower 309 will not differ too much. This is also the reason why the selection of 9 temperature measurement sections is also preferred.
As shown in fig. 11, the above-mentioned technical solution is used in practice, and for a suspension bridge with a length of about 2000 meters, 11 temperature measurement sections and 4 temperature measurement points per section are the cost-effective choices.
Preferably, the temperature measuring probe is a magnetic type temperature measuring probe, which can firmly fix the magnetic type temperature measuring probe on the temperature measuring point. The configuration makes the installation and the disassembly of the temperature measuring device convenient and quick, and improves the working efficiency. More preferably, the temperature probe includes a PT100 platinum resistor, and the resistance value of the PT100 platinum resistor changes with the change of temperature. 100 after PT means that its resistance is 100 ohms at 0℃and about 138.5 ohms at 100 ℃.
As an example, the high-precision PT100 temperature probe has the following characteristics:
the high-density silver plating shielding, silver plating conductors and teflon wires have the characteristics of high temperature resistance, corrosion resistance, acid and alkali resistance, water resistance and the like.
The epoxy resin is adopted for filling and sealing, the high-density silver plating shielding wire is never leaked, the 316L refined steel protective tube has stronger protective effect on the sensor,
the PT100 temperature sensor adopts polytetrafluoroethylene silvered wires, and comprises 2 cores, 3 cores and 4 cores, and silvered conductors. The temperature is resistant to 200 ℃, and 3 core wires are used by default;
the protective tube dimensions default to: diameter 4MM length;
the tail wire adopts a high-quality wiring terminal, a default opening is 4MM, and a needle-shaped terminal can be selected;
the A-level precision can reach 0.1 ℃, and the measurement range is as follows: -50 ℃ -100 ℃;
the universal soft aluminum strip for protecting the temperature sensor is attached, so that the contact area between the probe and the metal is increased.
Preferably, the temperature control module comprises an analog-to-digital conversion sub-module, a first serial interface and a first power interface, wherein the analog-to-digital conversion sub-module converts an analog temperature signal measured by the temperature measurement probe into digital temperature information, and the first power interface is electrically connected with the first power supply. It will be appreciated that the temperature control module also includes a first processor chip, which facilitates control of temperature acquisition, transmission, and calculation by programming.
As an example, the temperature measuring device serial communication technology realizes data communication between functional modules.
The serial communication technology is one of the most widely used communication technologies in the distributed industrial control system, and is also one of the oldest communication technologies in the industrial field. The RS485 bus is widely applied to a plurality of industrial control systems by the characteristics of simple structure, low manufacturing cost, multiple selectable chips, convenient maintenance and the like.
The temperature control module of the temperature measuring device is, for example, RS-4000M, and is mainly used in a distributed data acquisition system, and forms an industrial control field data acquisition terminal based on an RS485 bus together with other data acquisition modules.
The RS-4000M acquisition module adopts an RS485 communication interface and accords with the MODBUS RTU protocol specification. And can be compatible with almost all serial Modbus interface products provided by PLC and PAC suppliers.
The RS-4000M module adopts an electrical isolation technology and a watchdog technology, so that safe and reliable operation of equipment is effectively ensured.
A 32-bit 120M high speed ARM processor, embedded with a real-time operating system.
RS-4000M RS485 bus and Modbus RTU protocol acquisition module; CAN-4000T, CAN bus, ICAN protocol acquisition module; NET-4000M, ethernet bus, modbus TCP protocol acquisition module; the I/O pins are completely consistent, so that flexible selection among various product series is facilitated.
Providing a high-level dynamic library, only calls such as DAM_ReadDeviceAD are required to read data without concern for the underlying details.
The USB interface card, PCI interface card and Ethernet interface card are connected in a seamless way, so that a complete solution is provided for the distributed acquisition system.
The seamless connection of the CAN bridge, the CAN switch, the CAN-to-optical fiber equipment and other equipment provides a complete solution for the ultra-long-range hybrid structure measurement and control network
As an example, the technical parameters of the temperature control module are as follows:
model: RS-4041M;
thermal resistance input;
an input channel: 5, a step of;
the connection mode is as follows: 2 wire system/3 wire system;
input type: PT100, PT200, PT500, PT1000 (-200 ℃ to +850 ℃) Cu50, cu100 (-50 ℃ to +150 ℃)
Input impedance 1.5M
ADC resolution: 4-bit
Temperature resolution: 0.1 DEG C
Precision: (+ -0.1%
Sampling frequency all channels 5 times/second
Isolation: 2500V
Protection: building-in TVS/ESD Protection
±4kV Contact for each terminal
Preferably, the Lora wireless transmission module comprises a second processor chip, a memory, a second serial interface, an antenna interface and a second power interface; the second power interface of the Lora wireless transmission module is electrically connected with the first power supply; the first serial interface of the temperature control module is connected with the second serial interface of the Lora wireless transmission module, and the temperature information measured by the temperature measurement probe is transmitted to the Lora wireless transmission module; the Lora wireless transmission module supports LoRa wireless short-distance data transmission and can be used for self-networking; the Lora wireless transmission module can be used as a relay route and/or a terminal device.
The Lora wireless communication technology is very suitable for data communication of the data sensor of the suspension bridge in or between cities, greatly reduces the wiring complexity of information transmission and saves the cost. Because of the low power consumption of the Lora wireless communication technology, rechargeable batteries can be used for providing energy sources for the Lora wireless communication technology, and the batteries are replaced at intervals, so that the wiring complexity of the power line is reduced.
Preferably, the data acquisition control device comprises a third communication processor chip, a LoRa module, a wireless module, an embedded real-time operating system, a serial interface, an Ethernet LAN interface, a WIFI interface, an antenna interface and a third power interface, and can be connected with serial port equipment, ethernet equipment and WIFI equipment at the same time to realize transparent data transmission and routing.
As an example, the data acquisition control means is a TINCKAY TM The ESensor-RTU is an intelligent data acquisition and control instrument which is independently researched and developed by the applicant, and is a core foundation of the whole process intelligent monitoring platform.
The ESensor-RTU product has rich peripheral interfaces, supports various network communication, stable data transmission and remote reverse control commands, and can realize intelligent and unattended efficient processing and quick response based on a matched intelligent data application system.
Compared with other data acquisition devices, the ESensor-RTU adopts a distributed data acquisition mode, so that data acquisition is not limited in the working range of a single acquisition device, but can be carried out by carrying out the acquisition of related device running states, various analog quantities, switching values and sensor digital signals in the factory range through the Ethernet, the situation of data acquisition distortion caused by overlong acquisition distance is minimized, and the real-time and transmission speed of the Ethernet are incomparable in other corresponding modes.
After the suspension bridge is built, for the intellectualization of maintenance work, the automatic system for measuring the strand temperature of the suspension bridge can be converted into a system for monitoring the temperature stress of the suspension bridge, and hundreds of temperature sensors are needed to be arranged on the whole suspension bridge so as to monitor the temperature change of key structural points of the suspension bridge in real time, so that the Lora wireless communication relay equipment 13 is needed, and the reliability of data transmission is ensured.
Preferably, a Lora wireless transmission module is set for K adjacent temperature measurement sections as a repeater, which is called a Lora wireless communication relay module, wherein K is a positive integer greater than or equal to 1; the Lora wireless communication relay module can be in data communication with the Lora wireless transmission modules of the temperature measuring devices on the K adjacent temperature measuring sections, and can be in data communication with the data acquisition control device, so that the temperature information measured by the temperature measuring devices can be transmitted to the data acquisition control device. As shown in fig. 4, the Lora wireless communication relay apparatus 13 includes two Lora wireless communication relay modules.
As an example, the Lora wireless communication relay module adopts a high-performance industrial-level 32-bit communication processor and an industrial-level wireless module, uses an embedded real-time operating system as a software supporting platform, simultaneously provides 1 RS232 or RS485/RS422, 1 ethernet LAN,1 ethernet WAN/LAN multiplexing port and 1 WIFI interface, and can be simultaneously connected with serial port equipment, ethernet equipment and WIFI equipment to realize data transparent transmission and routing functions. The Lora wireless communication relay module adopts WDT watchdog design, so that the stability of the system is ensured; a complete anti-drop mechanism is adopted, so that the data terminal is ensured to be always online; standard RS232 or RS485/RS422, ethernet and WIFI interfaces are provided, and serial port equipment, ethernet equipment and WIFI equipment can be directly connected; providing a standard wired WAN port, supporting a standard PPPOE protocol and being capable of being directly connected with ADSL equipment; support multiple WAN connection modes, including static IP, DHCP, L2TP, PPTP, PPPOE,2.5G/3G/4G; supporting the intelligent switching backup function of wireless cellular and wired WAN double-link; the functions of remote management, SYSLOG, SNMP, TELNET, SSHD, HTTPS and the like are supported; supporting local and remote online upgrading, and importing and exporting configuration files; and supporting the wireless data transmission function of the LoRa network.
In order to remotely monitor the physical state of the suspension bridge in a traffic control center, the inventor provides an internet of things temperature measurement and control platform based on the automatic suspension bridge strand temperature measurement system.
Referring to fig. 4, 11-15, according to an embodiment of the temperature measurement and control platform of the internet of things of the present application, the temperature measurement and control platform of the internet of things includes data sensing front-end systems 11, 12, 13, a data transmission middle-end system 16, a data analysis back-end system 14, and a simulation application terminal system 15.
The data perception front-end system can collect various information data of the object by means of the Internet of things sensor through the Internet of things low-power consumption wide area network communication mode. Referring to fig. 4, the data sensing front-end system includes a temperature measuring device 11, a data acquisition control device 12, and a possible Lora wireless communication relay device 13. A detailed description of the manner of Lora wireless communication between these devices and equipment is provided above.
The data transmission center system 16 is a wired or wireless internet network capable of transmitting the information data to the data analysis backend system 14. Typically, it is appropriate for the suspension bridge to transmit temperature information data to the data analysis backend system via the mobile internet, which avoids the wiring costs of wired networks.
The simulation application terminal system 15 can extract the information data from the data analysis background system, and display the information data and the analysis result thereof on a computer screen in an object simulation mode, so as to realize remote monitoring of the object. Fig. 13 shows an example of the simulation application terminal system 15, which is a simulation suspension bridge displayed on the terminal screen. Fig. 14 shows three other terminal screen graphical interfaces.
The data sensing front-end system comprises the automatic temperature measuring system for the suspension bridge cable strands, the automatic temperature measuring system collects temperature information data of the suspension bridge strands, and the data acquisition control device transmits the temperature information data to the data analysis background system in a mobile or wired internet communication mode of the data transmission middle-end system. Referring to fig. 4, the automatic temperature measuring system for the strand of the suspension bridge comprises a temperature measuring device 11, a data acquisition control device 12 and a possible Lora wireless communication relay device 13.
The data analysis background system comprises a suspension bridge strand temperature database, wherein the suspension bridge strand temperature database comprises a strand temperature data table, and the suspension bridge strand temperature data table at least comprises strand numbers, measurement time and measurement temperature data fields, and the temperature data fields are used for storing the temperature information data; and judging whether the cable adjusting operation can be performed according to the temperature information data and the preset cable adjusting conditions. Referring to fig. 15, there is shown a view of the temperature data table of the suspension bridge strand, in which the measurement time is not shown due to the limitation of the screen width. The temperature information data interface of fig. 11 shows that the strand to be tuned has 11 temperature measurement sections, each section has 4 section temperature measurement points, calculates the average temperature of each temperature measurement section of the strand to be tuned, then compares the calculated difference with the average temperature of each temperature measurement section of the reference strand, and determines whether the strand to be tuned can be tuned according to the calculated difference, for example, the difference of each temperature measurement section is zero, which indicates that the strand to be tuned has recovered to a normal state, and tuning can be performed. Preferably, the predetermined tuning conditions are: the difference between the temperature weighted average value of the regulated strand on the span, namely the regulated span, and the temperature weighted average value of the reference strand on the corresponding span is within-0.3 ℃ to 0 ℃.
Referring to fig. 13, the simulation application terminal system includes a suspension bridge simulation graphical interface, where the suspension bridge simulation graphical interface includes a simulation image of the suspension bridge, and a cross section position of temperature measurement is marked on the simulation image of the suspension bridge, and a measurement time and a measurement temperature of each temperature measurement point of the same cross section are displayed in a pop-up window form, and whether a cable-adjusting condition is satisfied is reminded by an image, a color or a text, so that a cable-adjusting operation instruction is timely and remotely sent to a field operator.
According to the technical scheme, the technical effect of optimizing the rope-exchanging progress is achieved, under the action of the automatic measuring system for the temperature of the rope strands of the suspension bridge, the maximum speed of 18 rope strands per night is achieved for the suspension bridge with the length of about 2000 meters, and the continuity of rope strand erection is guaranteed.
Preferably, the simulation application terminal system can send a temperature data acquisition instruction, and transmits the temperature data acquisition instruction to a data acquisition control device of the suspension bridge strand temperature automatic measurement system through the data transmission middle-end system, the data acquisition control device polls the temperature measurement device, the temperature measurement device measures temperature information data of each temperature measurement section, and transmits the temperature information data to a strand temperature data table of the suspension bridge strand temperature database through the data acquisition control device and the data transmission middle-end system, analyzes and processes the temperature information data, refreshes the suspension bridge simulation graphical interface, and displays the change of the temperature information data.
Based on the technical scheme, in the construction process of the suspension bridge, the temperature distribution of each cable strand of the main cable can be remotely monitored in the assembly process of the main cable, and a cable adjusting instruction is sent once the cable adjusting condition is calculated to be met.
After the suspension bridge is built, the automatic temperature measuring system of the strand of the suspension bridge can be used for continuously monitoring the whole bridge.
The foregoing has described in detail preferred or specific embodiments of the invention. It should be understood that numerous modifications and variations will be apparent to those skilled in the art in light of the inventive concepts herein without requiring undue effort. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the design concept created by the present invention by the person skilled in the art shall be within the scope of the present invention and/or the protection scope defined by the claims.
Claims (9)
1. An automatic temperature measuring system for a strand of a suspension bridge, which is used for measuring temperatures of different positions of a main strand of the suspension bridge, wherein the suspension bridge comprises a suspension rope (1), a rope tower (2), an anchorage (3), a boom (4) and a bridge deck (5), wherein the bridge deck (5) is connected with the suspension rope (1) through the boom (4), and two ends of the suspension rope (1) are fixed on the anchorage (3) and supported by the rope tower (2), so that the bridge deck (5) can be suspended on a river surface;
The automatic temperature measuring system of the suspension bridge strand comprises a temperature measuring device (11) and a data acquisition control device (12), wherein,
the temperature measuring device (11) comprises a temperature measuring probe, a temperature control module, a Lora wireless transmission module and a first power supply; the temperature measuring probe is electrically connected with the temperature control module, and an electric signal measured by the temperature measuring probe is converted into temperature information by the temperature control module; the Lora wireless transmission module is electrically connected with the temperature control module and can transmit the temperature information to the data acquisition control device (12) in a Lora wireless communication mode; the first power supply can provide electric energy for the temperature control module and the Lora wireless transmission module;
the data acquisition control device (12) can perform unified standardization processing on the data information of the temperature measurement device (11), can be connected with a background database of the temperature measurement and control platform of the Internet of things, and can store the acquired temperature information into the background database, so that the temperature information data can be provided for a client program of the temperature measurement and control platform of the Internet of things;
the automatic temperature measuring system for the suspension bridge strands measures the temperature of the suspension bridge strands in the following manner:
Selecting the cross section positions of N main cable strands in the length direction of a main cable of the suspension bridge as a temperature measurement section, wherein N is a positive integer greater than 3;
selecting a temperature measuring point as a reference temperature measuring point on the periphery of each temperature measuring section of the main cable strand, and setting a temperature measuring probe of the temperature measuring device, which is called a reference temperature measuring probe, wherein the reference temperature measuring probe is fixed on the reference temperature measuring point and is used for measuring temperature information of the reference temperature measuring point;
selecting M temperature measurement points, namely cross-section temperature measurement points, on the periphery of the cross section of the main cable strand at set intervals by taking the reference temperature measurement points as base points, wherein M is a positive integer greater than or equal to 1, and setting a temperature measurement probe of the temperature measurement device, namely a cross-section temperature measurement probe, for each cross-section temperature measurement point, wherein each cross-section temperature measurement probe is fixed on the corresponding cross-section temperature measurement point and is used for measuring the temperature information of the cross-section temperature measurement point;
calculating the average temperature of each temperature measurement section of the strand to be regulated, comparing the average temperature with the average temperature of each temperature measurement section of the reference strand, calculating a difference value, determining whether the strand can be regulated according to the difference value, and when the difference value of each temperature measurement section is zero, indicating that the strand to be regulated is restored to a normal state, and regulating the strand;
The Lora wireless transmission module of each temperature measurement device can transmit the measured temperature information to the data acquisition control device; meanwhile, temperature measurement is carried out on M+1 temperature measurement points of the cross section positions of the N main cable strands, and all measured temperature information is stored into a background database of the temperature measurement and control platform of the Internet of things through the data acquisition control device;
fitting a temperature distribution curve of a main cable strand of the suspension bridge according to the whole temperature information by means of an interpolation calculation method;
the temperature measuring probe is a magnetic type temperature measuring probe, and the magnetic type temperature measuring probe can be firmly fixed on the temperature measuring point.
2. The automatic temperature measurement system for a strand of a suspension bridge according to claim 1, wherein: the number N of the temperature measurement sections is equal to 9, and the 9 temperature measurement sections are uniformly distributed on the length of a main cable of the suspension bridge;
the number of the section temperature measurement points M is 5, and the number of the section temperature measurement points M and the reference temperature measurement points of the same temperature measurement section are 6 temperature measurement points together, and the 6 temperature measurement points are uniformly distributed on the periphery of the temperature measurement section.
3. The automatic temperature measurement system for a strand of a suspension bridge according to claim 1, wherein: setting the suspension bridge as the east-west trend;
the number N of the temperature measurement sections is equal to 11, and the positions of the 11 temperature measurement sections are: east span near tieback (301), east span mid-span (302), east span near east tower (303), main span near east tower (304), three quarters of main span (305), main span mid-span (306), main span quarter (307), main span near west tower (308), west span near west tower (309), west span mid-span (310), and west span near tieback (311);
the number of the section temperature measurement points M is 3 to 5, and 4 to 6 temperature measurement points are provided together with the reference temperature measurement points of the same temperature measurement section, and the 6 temperature measurement points are uniformly distributed on the outer periphery of the temperature measurement section.
4. The automatic temperature measurement system for a strand of a suspension bridge according to claim 1, wherein: the temperature control module comprises an analog-to-digital conversion sub-module, a first serial interface and a first power interface, wherein the analog-to-digital conversion sub-module converts an analog temperature signal measured by the temperature measurement probe into digital temperature information, and the first power interface is electrically connected with the first power supply.
5. The automatic temperature measurement system for a strand of a suspension bridge according to claim 1, wherein: the Lora wireless transmission module comprises a second processor chip, a memory, a second serial interface, an antenna interface and a second power interface;
the second power interface of the Lora wireless transmission module is electrically connected with the first power supply;
the first serial interface of the temperature control module is connected with the second serial interface of the Lora wireless transmission module, and the temperature information measured by the temperature measurement probe is transmitted to the Lora wireless transmission module;
the Lora wireless transmission module supports LoRa wireless short-distance data transmission and can be used for self-networking;
the Lora wireless transmission module can be used as a relay route and/or a terminal device.
6. The automatic temperature measurement system for a strand of a suspension bridge according to claim 1, wherein: the data acquisition control device comprises a third communication processor chip, a LoRa module, a wireless module, an embedded real-time operating system, a serial interface, an Ethernet LAN interface, a WIFI interface, an antenna interface and a third power interface, and can be connected with serial port equipment, ethernet equipment and WIFI equipment at the same time to realize transparent data transmission and routing.
7. The automatic temperature measurement system for a strand of a suspension bridge according to claim 1, wherein: setting a Lora wireless transmission module as a repeater for K adjacent temperature measurement sections, which is called a Lora wireless communication relay module, wherein K is a positive integer greater than or equal to 1;
the Lora wireless communication relay module can be in data communication with the Lora wireless transmission modules of the temperature measuring devices on the K adjacent temperature measuring sections, and can be in data communication with the data acquisition control device, so that the temperature information measured by the temperature measuring devices can be transmitted to the data acquisition control device.
8. The temperature measurement and control platform of the Internet of things comprises a data perception front-end system, a data transmission middle-end system, a data analysis background system and a simulation application terminal system;
the data perception front-end system can collect various information data of the object by means of an Internet of things sensor through an Internet of things low-power consumption wide area network communication mode;
the data transmission middle-end system is a wired or wireless internet and can transmit the information data to the data analysis background system;
the simulation application terminal system can extract the information data from the data analysis background system, and display the information data and the analysis result thereof on a computer screen in an object simulation mode so as to realize remote monitoring of the object;
The method is characterized in that:
the data sensing front-end system comprises the automatic temperature measuring system for the cable strands of the suspension bridge according to any one of claims 1 to 7, wherein the automatic temperature measuring system collects temperature information data of the cable strands of the suspension bridge, and the data acquisition control device transmits the temperature information data to the data analysis background system in a mobile or wired internet communication mode of the data transmission middle-end system;
the data analysis background system comprises a suspension bridge strand temperature database, wherein the suspension bridge strand temperature database comprises a strand temperature data table, and the suspension bridge strand temperature data table at least comprises strand numbers, measurement time and measurement temperature data fields, and the temperature data fields are used for storing the temperature information data; judging whether cable adjusting operation can be performed according to the temperature information data and preset cable adjusting conditions;
the simulation application terminal system comprises a suspension bridge simulation graphical interface, wherein the suspension bridge simulation graphical interface comprises a simulation image of the suspension bridge, a cross section position of temperature measurement is marked on the simulation image of the suspension bridge, the measurement time and the measurement temperature of each temperature measurement point of the same cross section are displayed in a pop-up window mode, whether a cable adjusting condition is met or not is reminded through images, colors or characters, and therefore a cable adjusting operation instruction is timely and remotely sent to a field operator.
9. The internet of things temperature measurement and control platform of claim 8, wherein: the simulation application terminal system can send a temperature data acquisition instruction, the temperature data acquisition instruction is transmitted to a data acquisition control device of the suspension bridge strand temperature automatic measurement system through the data transmission middle-end system, the data acquisition control device polls the temperature measurement device, the temperature measurement device measures temperature information data of each temperature measurement section, the temperature information data is transmitted to a strand temperature data table of the suspension bridge strand temperature database through the data acquisition control device and the data transmission middle-end system, the temperature information data is analyzed and processed, the suspension bridge simulation graphical interface is refreshed, and the change of the temperature information data is displayed.
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| CN110514309B (en) * | 2019-09-06 | 2021-07-06 | 杭州纵联科技有限公司 | Wireless temperature sensor and wireless temperature measuring device comprising same |
| CN110823404A (en) * | 2019-11-29 | 2020-02-21 | 武汉智汇高桥科技股份有限公司 | Intelligent monitoring system for suspension bridge construction |
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