Bridge fire damage temperature field detection device and system

Abstract

The embodiment of the utility model relates to the technical field of highway engineering, and discloses a bridge fire damage temperature field detection device and system.The device comprises a first shell, heating equipment and multiple sets of first temperature sensing equipment, a containing cavity is formed in the first shell, and the side wall of the first shell extends into the containing cavity to form a partition layer; the partition layer divides the containing cavity into a testing cavity and a high-temperature cavity, the first shell is made of a heat insulation material, a through hole is formed in the partition layer and used for being opposite to a to-be-tested sample, the heating device is arranged in the high-temperature cavity and used for heating the high-temperature cavity, and the multiple sets of first temperature sensing devices are arranged on the inner side wall, where the testing cavity is located, of the first shell. And the plurality of groups of first temperature sensing equipment are used for being attached to a sample to be detected and are also used for being in signal connection with control equipment. In this way, the temperature field of the bridge after the fire can be rapidly and accurately obtained, and data support is provided for damage assessment of the bridge after the fire.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of highway engineering, and particularly to a device and a system for detecting the temperature field of bridge fire damage. Background Art

[0002] In recent years, with the development of the economic society and the acceleration of the urbanization process, the road traffic construction has entered a period of rapid development. The number of heavy vehicles transporting flammable and explosive goods has gradually increased, resulting in frequent bridge fire incidents, posing a serious threat to bridges. Fires have caused irreversible damage to bridge structures. Therefore, it is usually necessary to evaluate the damage degree of bridges after fires to avoid potential safety problems of the bridges after fires, which may seriously threaten the safety of human life and property.

[0003] At present, in China, a comprehensive and in-depth research system has not been formed in the field of detection and evaluation technology for concrete bridges after fires, especially the lack of rapid detection and evaluation standards for bridges after disasters. The degree of thermal damage suffered by bridge structures in fires needs to be evaluated and determined through their temperature fields. Therefore, the temperature field of bridges in fires is one of the important means to evaluate the damage degree of bridge structures, and the temperature field data also has far-reaching significance for aspects such as bridge assessment, reinforcement, and improvement of bridge bearing capacity. Therefore, how to quickly and accurately obtain the temperature field of bridges after disasters has become an urgent problem to be solved in the field of bridge safety assessment. Summary of the Utility Model

[0004] In view of the above problems, the embodiments of the present application provide a device and a system for detecting the temperature field of bridge fire damage, which are used to solve the problem that the temperature field of bridges after disasters cannot be quickly and accurately obtained at present.

[0005] According to one aspect of the embodiments of the present application, a device for detecting the temperature field of bridge fire damage is provided. The device includes: a first housing, a heating device, and multiple groups of first temperature sensing devices; a receiving cavity is formed inside the first housing, and a partition layer extends from the side wall of the first housing into the receiving cavity, and the partition layer divides the receiving cavity into a test cavity and a high-temperature cavity. The test cavity is used to place a sample to be tested and detect the temperature field of the sample to be tested, and the high-temperature cavity is used to heat the sample to be tested; the first housing is made of heat-insulating material, and a through hole is provided in the partition layer, and the through hole is used to be arranged opposite to the sample to be tested so that the high-temperature cavity heats the sample to be tested; the heating device is arranged in the high-temperature cavity and is used to heat the high-temperature cavity to simulate the high-temperature environment that the bridge bears during a fire; multiple groups of first temperature sensing devices are all arranged on the inner side wall of the first housing at the position where the test cavity is located, and are used to be in contact with the sample to be tested when the sample to be tested is placed in the test cavity; multiple groups of first temperature sensing devices are also used to be signal-connected to a control device, so that the control device can obtain the temperature values at different positions of the sample to be tested through the multiple groups of first temperature sensing devices and obtain the temperature field of the sample to be tested.

[0006] In an alternative manner, multiple groups of first temperature sensing devices are arranged along the side wall where the first housing and the partition layer are perpendicular to each other. Each group of first temperature sensing devices in the multiple groups of first temperature sensing devices includes a plurality of first temperature sensing devices, and the plurality of first temperature sensing devices are arranged along the circumferential direction of the first housing.

[0007] In an alternative manner, the distance between the edge of the through hole and the inner side wall of the first housing is greater than or equal to the height of the first temperature sensing device.

[0008] In an alternative manner, a second temperature sensing device is arranged in the high-temperature cavity. The second temperature sensing device is used for signal connection with a control device so that the control device can obtain the temperature of the high-temperature cavity through the second temperature sensing device.

[0009] In an alternative manner, the second temperature sensing device is arranged in contact with the partition layer.

[0010] In an alternative manner, the device further includes a second housing. The first housing is arranged inside the second housing, and the second housing is made of a heat-insulating material.

[0011] In an alternative manner, a cooling channel is arranged between the first housing and the second housing. The cooling channel is used for the cooling fluid to pass through so that the cooling fluid can absorb the heat of the first housing.

[0012] In an alternative manner, the heating device includes a fuel pipe and a burner head; the fuel pipe is arranged outside the first housing. One end of the fuel pipe is used for connection with a fuel source, and the other end is detachably connected to the burner head. The fuel pipe is used for delivering fuel to the burner head; the end of the burner head facing away from the fuel pipe passes through the first housing and extends into the high-temperature cavity, and the burner head is used for burning fuel and heating the high-temperature cavity.

[0013] In an alternative manner, the burner head is located on the side wall of the first housing opposite to the partition layer and is arranged opposite to the through hole.

[0014] According to another aspect of the embodiments of the present application, a bridge fire damage temperature field detection system is provided, including a control device and the bridge fire damage temperature field detection device described in any one of the above; the control device is signal-connected to the heating device and is used for controlling the heating device to heat the high-temperature cavity; the control device is also respectively signal-connected to multiple groups of first temperature sensing devices and is used for obtaining the temperature values at different positions of the sample to be tested and determining the temperature field of the sample to be tested according to the temperature values.

[0015] In the embodiments of the present application, by providing the first housing, the heating device and the first temperature sensing device, it is possible to simulate the scenario of a bridge fire to obtain the temperature of the sample to be tested, and then infer the temperature change inside the bridge during the fire, providing relevant data support for the assessment of bridge fire damage and making the assessment result more accurate. In addition, when using the bridge fire damage temperature field detection device to conduct a bridge fire experiment, the temperature at different positions inside the bridge can be obtained with only one experiment, without separately conducting individual experiments on the structures at different positions inside the bridge. The speed of obtaining the bridge fire damage temperature field data is faster, effectively accelerating the speed of bridge fire damage assessment and shortening the time of traffic interruption.

[0016] The above description is only an overview of the technical solution of the present application. In order to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0018] Figure 1 shows a schematic structural diagram of a bridge fire damage temperature field detection system provided by an embodiment of the present invention;

[0019] Figure 2 shows a cross-sectional view of a bridge fire damage temperature field detection device provided by an embodiment of the present invention;

[0020] Figure 3 shows a cross-sectional view of the bridge fire damage temperature field detection device from another angle provided by an embodiment of the present invention;

[0021] Figure 4 shows Figure 2 an enlarged schematic view of part A in

[0022] The reference numerals in the specific embodiments are as follows:

[0023] 1000, bridge fire damage temperature field detection system;

[0024] 100, bridge fire damage temperature field detection device, 200, control device, 300, placement table, 400, control button;

[0025] 110. First housing, 120. Heating device, 130. First temperature sensing device, 140. Second temperature sensing device, 150. Second housing, 160. Cooling channel;

[0026] 111. Accommodation cavity, 112. Partition layer, 113. Test cavity, 114. High temperature cavity, 115. Through hole, 116. Handle, 117. Connection point;

[0027] 121. Fuel pipe, 122. Combustion head, 123. Fixing bolt;

[0028] 151. Fluid inlet and outlet. Detailed implementation manners

[0029] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0031] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality" means more than two unless otherwise specifically defined.

[0032] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0033] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B may mean: A exists, both A and B exist, and B exists. In addition, the character " / " in this article generally means that the associated objects before and after are in an "or" relationship.

[0034] In the description of the embodiments of the present application, the term "plurality" means more than two (including two). Similarly, "multiple groups" means more than two groups (including two groups), and "multiple pieces" means more than two pieces (including two pieces).

[0035] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0036] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0037] The inventors of the present application have noticed that bridges will suffer different damages after a fire, and these damages mainly include concrete spalling, steel bar damage, bridge structure deformation, decline in composite material performance, etc. Therefore, after a fire, it is crucial to accurately evaluate the damage degree of the bridge, and usually the bridge needs to be tested to ensure the safety and reliability of the bridge. The inventors of the present application have also noticed that the damages suffered by the bridge during a fire are mainly related to the high-temperature environment brought by the fire. Specifically, when a fire occurs, the temperature inside the bridge will rise, which will then cause damage to the internal concrete, steel bars and other structures of the bridge. Therefore, the damage degree of the bridge after a fire can be evaluated by obtaining the temperature field of the bridge during the fire.

[0038] Based on the above content, in order to be able to quickly and accurately detect the temperature field of the bridge after a fire, the inventors of the present application have conducted in-depth research and designed a bridge fire damage temperature field detection device. The device simulates the fire that occurs to the bridge and detects the temperatures at different positions of the sample to be tested. The temperature field of the bridge during the fire is determined by the temperature values at different positions of the sample to be tested during the experiment, providing relevant data for the evaluation of the damage degree of the bridge after a fire.

[0039] Specifically, the device includes a housing, a heating device, and a temperature sensing device. An accommodation cavity is formed inside the housing, and the accommodation cavity is partitioned into a high-temperature cavity for simulating the high-temperature environment during a fire and a test cavity for detecting the temperature field of the bridge. First, place the sample to be tested in the test cavity and set it in contact with the temperature sensing device in the test cavity; then, heat the high-temperature cavity through the heating device so that the sample to be tested bears the temperature that the bridge bears during a fire; finally, obtain the temperature values at different positions of the sample to be tested through the temperature sensing device to obtain the temperature field of the sample to be tested.

[0040] After obtaining the temperature field of the sample to be tested, the temperature field during a bridge fire can be determined through the temperature field of the sample to be tested, and then the bridge after the fire can be evaluated through the temperature field. The above device can quickly and accurately determine the temperature field of the bridge during a fire by simulating the high-temperature environment during a fire and detecting the temperature field of the sample to be tested under the high-temperature environment, thereby improving the speed of bridge evaluation after a fire, shortening the time of traffic interruption, and reducing economic losses.

[0041] Please refer to Figure 1 , Figure 1 which shows a schematic structural diagram of a bridge fire damage temperature field detection system provided by an embodiment of the present invention. The bridge fire damage temperature field detection system 1000 mainly includes a bridge fire damage temperature field detection device 100 and a control device 200. The bridge fire damage temperature field detection device 100 is placed horizontally, that is, the bridge fire damage temperature field detection device 100 is placed along the direction shown by the X axis. The heating device 120 is located in the cavity on the left side of the accommodation cavity 111 inside the housing, and the first temperature sensing device 130 is located in the cavity on the right side of the accommodation cavity 111. Of course, the bridge fire damage temperature field detection device 100 can also be placed vertically, that is, the bridge fire damage temperature field detection device 100 is placed along the direction shown by the Y axis. At this time, the heating device 120 needs to be located in the cavity in the upper part of the accommodation cavity 111, and the first temperature sensing device 130 needs to be located in the cavity in the lower part of the accommodation cavity 111. And to ensure the stability of the bridge fire damage temperature field detection device 100, after placing the sample to be tested in the accommodation cavity 111, the sample to be tested can also be fixed by a tool.

[0042] As Figure 1As shown, when detecting the fire damage temperature field of a bridge, first open the housing of the bridge fire damage temperature field detection device 100, then place the sample to be tested obtained from the bridge in the cavity on the right side of the accommodation cavity 111, and make the side wall of the sample to be tested adhere to multiple groups of temperature sensors. Finally, close the housing. Then, turn on the heating device 120 through the control device 200 to make the heating device 120 heat the cavity on the left side of the accommodation cavity 111, so that the temperature of the cavity on the left side of the accommodation cavity 111 is the same as the temperature borne by the bridge surface when the bridge catches fire. Then, the control device 200 obtains the temperatures at different positions of the sample to be tested through the first temperature sensing device 130 to obtain the temperature field of the sample to be tested. Finally, determine the temperature field of the bridge when the bridge catches fire according to the temperature field of the sample to be tested.

[0043] The bridge fire damage temperature field detection device in the embodiment of the present application can be applied not only to transportation facilities such as bridges and highways, but also to structures such as walls and columns. In the embodiment of the present application, only the bridge is taken as an example for illustration, which does not constitute a limitation on the specific use scenarios of the bridge fire damage temperature field detection device.

[0044] According to one aspect of the embodiment of the present application, there is provided a bridge fire damage temperature field detection device, as Figure 2 and Figure 3 shown, Figure 2 FIG. shows a cross-sectional view of the bridge fire damage temperature field detection device provided by the embodiment of the present invention, Figure 3 FIG. shows a cross-sectional view of the bridge fire damage temperature field detection device provided by the embodiment of the present invention from another angle. The bridge fire damage temperature field detection device 100 includes a first housing 110, a heating device 120, and multiple groups of first temperature sensing devices 130. An accommodation cavity 111 is formed in the first housing 110. A partition layer 112 extends from the side wall of the first housing 110 into the accommodation cavity 111. The partition layer 112 divides the accommodation cavity 111 into a test cavity 113 and a high-temperature cavity 114. The test cavity 113 is used to place the sample to be tested and detect the temperature field of the sample to be tested. The high-temperature cavity 114 is used to heat the sample to be tested. The first housing 110 is made of a heat-insulating material. A through hole 115 is provided in the partition layer 112. The through hole 115 is used to be disposed opposite to the sample to be tested so that the high-temperature cavity 114 heats the sample to be tested. The heating device 120 is disposed in the high-temperature cavity 114 and is used to heat the high-temperature cavity 114 to simulate the high-temperature environment borne by the bridge during a fire. Multiple groups of first temperature sensing devices 130 are all disposed on the inner side wall of the first housing 110 at the position where the test cavity 113 is located and are used to adhere to the sample to be tested when the sample to be tested is placed in the test cavity 113. Multiple groups of first temperature sensing devices 130 are also used to be signal-connected to the control device so that the control device obtains the temperature values at different positions of the sample to be tested through multiple groups of first temperature sensing devices 130 to obtain the temperature field of the sample to be tested.

[0045] As shown Figure 2 In the first housing 110, an accommodation cavity 111 is formed. The accommodation cavity 111 is the main place where the bridge fire damage temperature field detection device 100 completes experiments. In the simulation experiment of bridge fire, the test samples obtained from the bridge need to be placed in the accommodation cavity 111, and the high-temperature environment during a fire is simulated in the accommodation cavity 111, so that the surface of the test samples bears a relatively high temperature to simulate the scenario of a bridge fire. Since the temperature during a fire is very high, in order to ensure the safety of the device, the first housing 110 can be made of heat-insulating materials with properties such as light weight, corrosion resistance, high temperature resistance, and heat preservation and insulation. For example, calcium silicate, diatomaceous earth, alumina, aerogel, perlite, rock wool, etc. Among them, the thermal conductivity of materials such as calcium silicate, aerogel, perlite, and rock wool is less than 0.145 w / (M.K), which can effectively improve the safety of the experimental process and improve the experimental operation environment.

[0046] In addition, in order to open the first housing more conveniently, as Figure 1 shown, a handle 116 can be provided on the first housing 110. When placing the test samples, grasp the handle and pull upward to make the upper side wall of the first housing 110 vertical, and then the first housing 110 can be opened. Specifically, a rotatable connection structure can be provided between the upper side wall of the first housing 110 and one of its side walls, so that only the upper side wall of the first housing 110 rotates when opening the first housing 110; or a rotating structure can be provided at the position where the connection 117 is located. When opening the first housing 110, the rotating part of the first housing 110 can be placed on the placement table 300.

[0047] The test samples are often obtained by core drilling from the positions adjacent to the fire-affected positions on the bridge that are not affected by the fire, and most of the samples obtained by core drilling with existing tools are cylindrical in shape. Therefore, as Figure 3 shown, in order to make the test samples fit better with the first temperature sensing device 130, the inner side wall of the first housing 110 can be bent into an arc shape, so that after the first temperature sensing device 130 is set up, the outer periphery of the space for placing the test samples in the accommodation cavity 111 is also in an arc shape.

[0048] In order to separate the space for simulating the high-temperature environment in the accommodation cavity 111 from the space for testing the test samples and prevent the high-temperature environment from affecting other components inside the first housing 110, as Figure 2 shown, the side wall of the first housing 110 extends inward into the accommodation cavity 111 to form a partition layer 112, and the accommodation cavity 111 is partitioned into a test cavity 113 and a high-temperature cavity 114. In addition to as Figure 2In addition to the partition layer 112 shown in the figure being integrally formed with the first housing 110, the partition layer 112 can also be separated from the first housing 110, and the partition layer 112 and the first housing 110 can be fixedly connected by means of snap connection, adhesion, etc. In addition, when the partition layer 112 and the first housing 110 are separated from each other, they can be made of different heat-insulating materials.

[0049] Since the partition layer 112 is made of a heat-insulating material, if the partition layer 112 completely isolates the accommodation cavity 111, it is difficult for the heat in the high-temperature cavity 114 to be conducted to the test cavity 113, that is, the high-temperature environment in the high-temperature cavity 114 cannot act on the sample to be tested. Therefore, through holes 115 can be opened in the partition layer 112 so that the heat in the high-temperature cavity 114 is conducted to the sample to be tested in the test cavity 113 through the through holes 115.

[0050] The heating device 120 can heat up the temperature in the high-temperature cavity 114 by burning fuel, and can heat the high-temperature cavity 114 by burning fuels such as natural gas, liquefied petroleum gas, gasoline, and diesel. Specifically, when the main combustible during a bridge fire is gasoline, gasoline can be used as the fuel; when the main combustible during a bridge fire is diesel, diesel can be used as the fuel, making the simulated fire scenario more similar to the actual fire scenario that occurs on the bridge. Of course, clean fuels such as natural gas and hydrogen can also be used as experimental fuels to reduce the pollution caused by the fuel.

[0051] In addition, when a bridge catches fire, the flame only appears on the surface of the bridge, and the damage to the internal structure of the bridge is mainly caused by the excessive temperature inside the bridge after a large amount of heat from the fire is conducted into the bridge. Therefore, when simulating the high-temperature environment during a fire, devices such as electric heating plates and infrared heaters can also be used to heat up the high-temperature cavity 114, so that there is a large amount of heat in the high-temperature cavity 114, and this heat can be conducted into the sample to be tested to simulate the scenario where the heat from the fire during a bridge fire is conducted into the bridge interior, effectively reducing the use of open flames and making the experiment safer.

[0052] Such as Figure 2 and Figure 3As shown, the first temperature sensing device 130 is disposed on the inner sidewall of the first housing 110. During the bridge fire experiment, after placing the sample to be tested in the test chamber 113, the position of the first temperature sensing device 130 is adjusted so that the first temperature sensing device 130 is in close contact with the surface of the sample to be tested. When heat conduction occurs between the sample to be tested and the high-temperature chamber 114, the temperature inside the sample to be tested gradually increases. The first temperature sensing device 130 monitors the temperature of the sample to be tested in real time and converts the detected temperature data into a temperature signal and transmits it to the control device, so that the control device can generate a temperature change curve at each position of the sample to be tested based on the temperature data after the experiment, that is, the temperature change curve inside the bridge during a fire, and thus can more accurately evaluate the fire damage of the bridge. The first temperature sensing device can be a temperature detection device such as a thermistor, a temperature sensor, a thermometer, etc.

[0053] During the bridge fire experiment, after opening the first housing 110, the sample to be tested obtained by core drilling from the bridge is placed in the test chamber 113, and the first temperature sensing device 130 is adjusted so that the first temperature sensing device 130 is in close contact with the sidewall of the sample to be tested. Then, based on the combustibles during the bridge fire, data such as the maximum temperature of the fire scene, the duration of the full-scale fire, and the duration of the fire scene are determined. Then, parameters such as the maximum temperature, the heating time, the duration, and the cooling time of the maximum temperature are set through the control device. Finally, the control device controls the heating device 120 to heat up the high-temperature chamber 114 according to these parameters. Finally, the first temperature sensing device 130 obtains the temperatures at different positions of the sample to be tested and transmits the corresponding temperatures to the control device. After the experiment, information such as the size of the sample to be tested, the experiment time, the maximum temperature, and the temperature-distance curve will be recorded on the control device. Based on this information, data such as the temperature change curve and the maximum temperature inside the bridge during a fire can be obtained, and then the fire damage situation of the bridge can be evaluated based on these data.

[0054] In the above embodiment, by setting the first housing 110, the heating device 120, and the first temperature sensing device 130, it is possible to simulate the scene when a bridge catches fire to obtain the temperature of the sample to be tested, and then infer the temperature change inside the bridge during a fire, providing relevant data support for the evaluation of bridge fire damage and making the evaluation result more accurate. In addition, when using the bridge fire damage temperature field detection device 100 to conduct a bridge fire experiment, the temperature at different positions inside the bridge can be obtained with only one experiment, without separately conducting individual experiments on the structures at different positions inside the bridge. The speed of obtaining bridge fire damage temperature field data is faster, effectively accelerating the speed of bridge fire damage evaluation and shortening the time of traffic interruption.

[0055] To further ensure the accuracy of the temperature field of the sample to be tested, in some embodiments of the present application, such asFigure 2 and Figure 3 As shown in Figure 3 , multiple groups of first temperature sensing devices 130 are arranged along the side walls of the first housing 110 that are perpendicular to the partition layer 112. Each group of first temperature sensing devices 130 in the multiple groups of first temperature sensing devices 130 includes multiple first temperature sensing devices 130, and the multiple first temperature sensing devices 130 are arranged along the circumferential direction of the first housing 110.

[0056] As Figure 2 shown, multiple groups of first temperature sensing devices 130 are arranged on the side walls of the first housing 110 that are perpendicular to the partition layer 112, that is, the multiple groups of first temperature sensing devices 130 are arranged in the direction shown by the X-axis in the test chamber 113 to detect the temperature values at positions with different lengths from the high-temperature surface on the sample to be tested, and then infer the temperature changes of the structures at different depths inside the bridge during a fire. Since the thickness of the bridge is often large, if each position of the sample to be tested is detected, a large number of first temperature sensing devices 130 are required. Therefore, without affecting the temperature detection results, multiple groups of first temperature sensing devices 130 can be arranged at intervals. In the embodiments of the present application, as an example, the adjacent two groups of first temperature sensing devices 130 can be spaced 10 mm apart. In addition, since the farther the position on the sample to be tested is from the high-temperature surface, the smaller the influence is. To further reduce costs, the interval between the first temperature sensing devices 130 at positions farther from the partition layer 112 can be larger. For example, the interval between the adjacent two groups of first temperature sensing devices 130 in the first temperature sensing devices 130 near the partition layer 112 is 10 mm, while the interval between the adjacent two groups of first temperature sensing devices 130 in the first temperature sensing devices 130 far from the partition layer 112 is 15 mm.

[0057] In addition, during the implementation of the bridge fire, the temperatures on different sides of the sample to be tested with the same distance from the high-temperature surface may be different. To avoid the contingency of the test results, as Figure 3As shown, each group of first temperature sensing devices 130 includes a plurality of first temperature sensing devices 130, and these first temperature sensing devices 130 are arranged along the circumferential direction of the first housing 110, that is, these first temperature sensing devices 130 are arranged around the inner sidewall of the first housing 110. For example, when the inner sidewall of the first housing 110 is bent into an arc shape, the first temperature sensing devices 130 are arranged around the arc. In addition, when obtaining the temperature value at a certain position of the sample to be measured, the average value of the temperature values obtained by all the first temperature sensing devices 130 in a group of first temperature sensing devices 130 corresponding to this position can be used as the temperature value at this position. In the embodiments of the present application, as an example, each group of first temperature sensing devices 130 includes 6 first temperature sensing devices 130, and these first temperature sensing devices 130 are evenly arranged along the inner sidewall of the first housing 110. The average value of the temperature values obtained by the 6 first temperature sensing devices 130 in the same group is the temperature value at the position of the sample to be measured where this group of first temperature sensing devices 130 is located.

[0058] In the above embodiment, by arranging multiple groups of first temperature sensing devices 130 along the sidewall of the first housing 110 perpendicular to the partition layer 112, the temperature values obtained by each group of first temperature sensing devices 130 are the temperature values at different depths inside the bridge. Thus, the temperature values at different depths on the bridge can be obtained in one experiment without conducting separate experiments on the structures at each depth on the bridge. In addition, by arranging the multiple first temperature sensing devices 130 in each group of first temperature sensing devices 130 along the circumferential direction of the first housing 110, the temperature at each depth is determined by multiple temperature values, effectively avoiding the occurrence of accidental events and improving the accuracy of the experimental results.

[0059] When the distance between the through hole and the inner sidewall of the first housing is small, in addition to the heat of the high-temperature cavity being conducted to the inside of the sample to be measured through the surface of the sample to be measured, the heat can also be conducted to the test cavity through the gap between the through hole and the sample to be measured. This will cause the temperature detected by the first temperature sensing device to include not only the heat conducted by the sample to be measured but also the heat conducted from the high-temperature cavity to the test cavity, resulting in a large error in the temperature value obtained by the first temperature sensing device. Therefore, in order to further ensure the accuracy of the temperature value obtained by the first temperature sensing device, in some embodiments of the present application, as Figure 2 shown, the distance D between the edge of the through hole 115 and the inner sidewall of the first housing 110 is greater than or equal to the height H of the first temperature sensing device 130.

[0060] When the distance D between the edge of the through hole 115 and the inner side wall of the first housing 110 is greater than or equal to the height H of the first temperature sensing device 130, after the sample to be measured is placed in the test chamber 113 and abuts against the partition layer 112, the high-temperature chamber 114 and the test chamber 113 will be completely separated by the partition layer 112 and the sample to be measured. At this time, the heat of the high-temperature chamber 114 can only be conducted into the sample to be measured through the through hole 115, and cannot be conducted into the test chamber 113 through the gap between the through hole 115 and the sample to be measured, effectively reducing the influence of the heat of the high-temperature chamber 114 on the first temperature sensing device 130 and making the temperature value obtained by the first temperature sensing device 130 more accurate.

[0061] In order to further ensure that the high-temperature environment simulated by the high-temperature chamber is closer to the actual high-temperature environment during a fire, in some embodiments of the present application, as Figure 2 shown, a second temperature sensing device 140 is provided in the high-temperature chamber 114. The second temperature sensing device 140 is used for signal connection with a control device so that the control device can obtain the temperature of the high-temperature chamber 114 through the second temperature sensing device 140. When conducting a bridge fire experiment, although the heating device 120 can be controlled to operate according to different parameters so that the high-temperature chamber 114 is heated to the corresponding temperature, the flow rate of the air inside the first housing 110, the thermal conductivity of the first housing 110, the temperature outside the first housing 110, etc. will all affect the temperature of the high-temperature chamber 114. Therefore, during the experiment, the temperature in the high-temperature chamber 114 also needs to be monitored. When there is a difference between the temperature of the high-temperature chamber 114 and the required experimental temperature, the temperature of the high-temperature chamber 114 can be adjusted in a timely manner.

[0062] The second temperature sensing device 140 is the same as the first temperature sensing device 130, and will not be described in detail here. In the same device, the type of the second temperature sensing device 140 can be the same as that of the first temperature sensing device 130. For example, both are temperature sensors, or they can be different. For example, one is a temperature sensor and the other is a thermometer.

[0063] By providing the second temperature sensing device 140 in the above embodiments, the temperature in the high-temperature chamber 114 can be monitored, and then when there is a large difference between the high-temperature environment simulated in the high-temperature chamber 114 and the actual high-temperature environment during a bridge fire, timely adjustment can be made to ensure that the high-temperature environment simulated by the high-temperature chamber is closer to the actual high-temperature environment during a fire, effectively improving the accuracy of the temperature field obtained from the bridge fire experiment.

[0064] When the space inside the high-temperature chamber is relatively large, during the process of heating up the high-temperature chamber by the heating device, the temperatures at various positions inside the high-temperature chamber may be different, which may lead to a difference between the temperature value obtained by the second temperature sensing device and the temperature value borne by the surface of the sample to be measured. Therefore, in order to make the temperature borne by the surface of the sample to be measured more similar to the actual temperature borne by the bridge surface during a fire, in some embodiments of the present application, such as Figure 2 shown, the second temperature sensing device 140 is disposed in contact with the partition layer 112. The heat in the high-temperature chamber 114 needs to be conducted to the surface of the sample to be measured through the through holes 115 on the partition layer 112. Therefore, the temperature of the part of the high-temperature chamber 114 close to the partition layer 112 is closer to the temperature borne by the surface of the sample to be measured. After the second temperature sensing device 140 is disposed in contact with the partition layer 112, the detected temperature will also be closer to the temperature borne by the surface of the sample to be measured. By adjusting the temperature of the high-temperature chamber 114 based on the temperature at this position, it can be ensured that the temperature borne by the surface of the sample to be measured is more similar to the actual temperature borne by the bridge surface during a fire, effectively improving the accuracy of the temperature field obtained from the bridge fire experiment.

[0065] Since the temperature borne by the bridge surface during a fire is very high, in order to ensure the accuracy of the experimental results, the temperature inside the first housing will also be very high during the experiment. Therefore, in order to ensure the safety of the device, in some examples of the present application, such as Figure 2 shown, the device further includes a second housing 150. The first housing 110 is disposed inside the second housing 150, and the second housing 150 is made of a heat-insulating material. Since a first housing 110 with relatively good heat-insulating performance has already been provided in the bridge fire damage temperature field detection device, in addition to being made of the same heat-insulating material as the first housing 110, the second housing 150 can also use metal materials with relatively low thermal conductivity such as lead, manganese, iron, and nickel.

[0066] The second housing 150 can be disposed in contact with the first housing 110, making the entire housing of the bridge fire damage temperature field detection device 100 thicker and more solid, improving the stability of the bridge fire damage temperature field detection device 100. The second housing 150 can also be, as Figure 2 shown, spaced apart from the first housing, such that when the heat inside the first housing 110 is conducted to the external air, in addition to passing through the first housing 110 and the second housing 150, it also needs to pass through the space between the two, slowing down the speed of heat conduction.

[0067] By providing the second housing 150 in the above-mentioned embodiments, the bridge fire damage temperature field detection device 100 is provided with an additional heat-insulating structure, effectively preventing the temperature on the surface of the bridge fire damage temperature field detection device 100 from being too high and avoiding scalding the user.

[0068] In order to further improve the safety of the device, in some embodiments of the present application, as Figure 2 shown, a cooling channel 160 is provided between the first housing 110 and the second housing 150. The cooling channel 160 is used for a cooling fluid to pass through, so that the cooling fluid absorbs the heat of the first housing 110. During the bridge fire experiment, the temperature inside the first housing 110 is relatively high. Especially when using fuel for heating, the maximum heating temperature of the heating device 120 can reach 2000 degrees Celsius. The too high temperature will cause the devices inside the bridge fire damage temperature field detection device 100 to be more easily damaged. When the internal devices of the bridge fire damage temperature field detection device 100 are damaged during the bridge fire experiment, the experiment needs to be paused and ended. At this time, the temperature inside the first housing 110 has not yet dropped. If the first housing 110 is directly opened, it is easy to be scalded. Therefore, it is necessary to quickly cool down the first housing 110.

[0069] As Figure 2 shown, a fluid inlet / outlet 151 can be opened on the second housing 150. When it is necessary to cool down the first housing 110, the cooling fluid is conveyed into the cooling channel 160 through the fluid inlet / outlet 151. After the cooling fluid conducts heat with the first housing 110, it will absorb the temperature on the first housing 110, causing the temperature of the first housing 110 to drop rapidly. The cooling fluid can be cooling water, low-temperature air, etc.

[0070] In the above embodiment, by providing the cooling channel 160, when an emergency occurs during the experiment, the cooling fluid can be conveyed into the cooling channel 160 to absorb the heat of the first housing 110 through the cooling fluid, thereby rapidly cooling down the first housing 110 and further improving the safety of the experimental process.

[0071] In order to make the scenario simulated by the device more similar to the actual fire scenario, in some embodiments of the present application, as Figure 2 and Figure 4 shown, Figure 4 shows Figure 2 an enlarged schematic view of part A in

[0072] During the process of conducting a bridge fire experiment, the specific fuel to be used is determined according to the combustibles in the bridge fire, and different amounts of fuel are delivered to the burner head through the fuel pipe, so that the burner head generates flames of different sizes, and then the temperature in the high-temperature chamber 114 is different. As Figure 4 shown, one end of the burner head 122 is connected to the fuel pipe 121, and the other end passes through the first housing 110 and extends into the high-temperature chamber 114. When conducting a bridge fire experiment, the burner head 122 can burn fuel in the high-temperature chamber 114 to generate a flame and heat up the high-temperature chamber 114. The fuel pipe 121 and the burner head 122 can be connected by fixing bolts 123.

[0073] In addition to being arranged on the side wall of the first housing 110 opposite to the partition layer 112 as Figure 2 shown, the burner head 122 can also be arranged on the side wall of the first housing 110 perpendicular to the partition layer 112, as long as it can heat up the high-temperature chamber 114. The burner head 122 can be an electronic ignition burner head, a proportional adjustment burner head, a variable frequency control burner head, etc.

[0074] In the above embodiment, the high-temperature chamber 114 is heated by the fuel pipe 121 and the burner head 122, so that the bridge fire damage temperature field detection device 100 can eject a flame, and the scenario simulated by the bridge fire damage temperature field detection device 100 is more similar to the actual scenario when the bridge catches fire, effectively improving the accuracy of the temperature field obtained from the bridge fire experiment.

[0075] In order to further improve the similarity between the scenario simulated by the device and the actual scenario, in some examples of the present application, as Figure 2 and Figure 4 shown, the burner head 122 is located on the side wall of the first housing 110 opposite to the partition layer 112 and is arranged opposite to the through hole 115. The burner head 122 is located on the left side wall of the first housing 110, and the combustion end of the burner head 122 is aligned with the through hole 115 on the partition layer 112. When the fuel pipe 121 delivers fuel to the burner head 122, the burner head 122 sprays a flame in the positive X-axis direction. If the flame sprayed by the burner head 122 is far enough, the flame can pass through the through hole 115 and enter the test chamber 113. At this time, if a sample to be tested is placed in the test chamber 113, the flame can burn the surface of the sample to be tested facing the negative X-axis direction, and this scenario is more in line with the scenario when the combustibles on the bridge surface burn and generate a flame to burn the bridge surface when the bridge catches fire. Therefore, by arranging the burner head 122 opposite to the through hole 115, the flame generated by the burner head 122 burns the surface of the sample to be tested, and the temperature field of the bridge fire damage obtained by simulating the scenario of the bridge fire is more accurate.

[0076] According to another aspect of the embodiments of the present application, as Figure 1As shown in the figure, a bridge fire damage temperature field detection system 1000 is also provided, which includes a control device 200 and the bridge fire damage temperature field detection device 100 described in any of the above embodiments. The control device 200 is signal-connected to the heating device 120 and is used to control the heating device 120 to heat the high-temperature cavity 114. The control device 200 is also respectively signal-connected to multiple groups of first temperature sensing devices 130 and is used to obtain the temperature values at different positions of the sample to be tested and determine the temperature field of the sample to be tested according to the temperature values.

[0077] The control device 200 can be a controller such as an MCU (Microcontroller Unit, single-chip microprocessor), a PLC (Programmable Logic Controller), or a server, a terminal device, etc. including one or more processors. Among them, the processor included in the control device 200 can be a central processing unit CPU, or an application specific integrated circuit (ASIC for short), or one or more integrated circuits configured to implement the embodiments of the present invention, which is not limited herein. One or more processors included in the control device 200 can be of the same type of processor, such as one or more CPUs; or different types of processors, such as one or more CPUs and one or more ASICs, which is not limited herein.

[0078] The control device 200 can be signal-connected to the heating device 120 and the first temperature sensing device 130 through wires, or can be signal-connected by means of wireless communication such as Bluetooth, WIFI, etc. Specifically, a wireless signal module can be integrated in the heating device 120 and the first temperature sensing device 130. In addition, a control button 400 can be provided on the control device 200. The control button 400 can be an emergency stop button, a cooling start button, etc. When an accident occurs during the bridge fire experiment, the bridge fire damage temperature field detection system 1000 can be controlled through the control button 400, and the operation of the bridge fire damage temperature field detection system 1000 can be stopped more quickly, and the first housing 110 can be quickly cooled down.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A device for detecting the temperature field of a bridge fire damage, characterized in that, The device includes: a first housing, a heating device, and multiple groups of first temperature sensing devices; A receiving cavity is formed inside the first housing. A partition layer extends from the side wall of the first housing into the receiving cavity. The partition layer divides the receiving cavity into a test cavity and a high-temperature cavity. The test cavity is used to place a sample to be tested and detect the temperature field of the sample to be tested, and the high-temperature cavity is used to heat the sample to be tested; The first housing is made of a heat-insulating material. The partition layer is provided with a through hole, and the through hole is used to be arranged opposite to the sample to be tested, so that the high-temperature cavity heats the sample to be tested; The heating device is arranged in the high-temperature cavity and is used to heat the high-temperature cavity to simulate the high-temperature environment that a bridge bears during a fire; The multiple groups of first temperature sensing devices are all arranged on the inner side wall of the first housing at the position where the test cavity is located, and are used to be in contact with the sample to be tested when the sample to be tested is placed in the test cavity; The multiple groups of first temperature sensing devices are also used to be signal-connected to a control device, so that the control device can obtain the temperature values at different positions of the sample to be tested through the multiple groups of first temperature sensing devices, and obtain the temperature field of the sample to be tested.

2. The bridge fire damage temperature field detection device according to claim 1, characterized in that, The multiple groups of first temperature sensing devices are arranged along the side wall of the first housing perpendicular to the partition layer. Each group of first temperature sensing devices in the multiple groups of first temperature sensing devices includes multiple first temperature sensing devices, and the multiple first temperature sensing devices are arranged along the circumferential direction of the first housing.

3. The bridge fire damage temperature field detection device according to claim 2, wherein, The distance between the edge of the through hole and the inner side wall of the first housing is greater than or equal to the height of the first temperature sensing device.

4. The bridge fire damage temperature field detection device according to claim 1, characterized in that, A second temperature sensing device is arranged in the high-temperature cavity. The second temperature sensing device is used to be signal-connected to the control device, so that the control device can obtain the temperature of the high-temperature cavity through the second temperature sensing device.

5. The bridge fire damage temperature field detection device according to claim 4, characterized in that, The second temperature sensing device is arranged in contact with the partition layer.

6. The bridge fire damage temperature field detection device according to claim 1, characterized in that, The device further includes a second housing. The first housing is arranged inside the second housing, and the second housing is made of a heat-insulating material.

7. The bridge fire damage temperature field detection device according to claim 6, characterized in that, A cooling channel is arranged between the first housing and the second housing. The cooling channel is used for a cooling fluid to pass through, so that the cooling fluid absorbs the heat of the first housing.

8. The bridge fire damage temperature field detection device according to claim 1, characterized in that, The heating device includes a fuel pipe and a burner head; The fuel pipe is arranged outside the first housing. One end of the fuel pipe is used to be connected to a fuel source, and the other end is detachably connected to the burner head. The fuel pipe is used to transport fuel to the burner head; One end of the burner head facing away from the fuel pipe passes through the first housing and extends into the high-temperature cavity. The burner head is used to burn the fuel and heat the high-temperature cavity.

9. The bridge fire damage temperature field detection device according to claim 8, characterized in that, The burner head is located on the side wall of the first housing opposite to the partition layer and is arranged opposite to the through hole.

10. A bridge fire damage temperature field detection system, characterized in that, It includes a control device and a bridge fire damage temperature field detection device according to any one of claims 1-9; The control device is signal-connected to the heating device and is used to control the heating device to heat the high-temperature cavity; The control device is also respectively connected to the multiple groups of first temperature sensing devices in a signal connection manner, and is used to obtain the temperature values at different positions of the sample to be measured, and determine the temperature field of the sample to be measured according to the temperature values.

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