Circulating heat supply tunnel fire hydrant pipe network and using method thereof

Abstract

The invention discloses a circulating heat supply tunnel fire hydrant pipe network and a using method thereof, the circulating heat supply tunnel fire hydrant pipe network comprises a fire-fighting main pipeline, the fire-fighting main pipeline is connected with fire hydrants through branch pipelines, and the fire-fighting main pipeline is provided with a first water inlet and a second water inlet; the circulating heat supply device is respectively communicated with the first water inlet and the second water inlet through a water inlet pipeline; the fire pool is connected with the water inlet pipeline; wherein the circulating heat supply device is controlled to be turned on and turned off according to the temperature inside the tunnel and the temperature outside the tunnel. By arranging the circulating heat supply device, heat can be directly supplied to water flowing through the fire-fighting main pipeline, energy consumption is effectively reduced, on one hand, more energy is saved, on the other hand, the operation cost can be reduced, and economical efficiency is improved; through connection of the fire pools and switching of the valves, it can be guaranteed that water supply in the main fire pipeline is sufficient when a fire occurs, and then timeliness and reliability of fire extinguishing in the main fire pipeline are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel fire protection systems, and in particular to a circulating heating tunnel fire hydrant network and a method of using the same. Background Art

[0002] Seasonal low temperatures in cold-region highway tunnels cause freezing of water sources and pipe networks in tunnel firefighting systems, significantly impacting fire safety during winter tunnel operations and creating significant firefighting liability issues. Traditional electric heating with insulation layers, used to maintain firefighting pipe temperatures above freezing, has high operating costs, heavy burdens on maintenance departments, and unstable performance, making their work difficult and ineffective. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] In view of this, the present invention provides a circulating heating tunnel fire hydrant network and a method of use thereof, in which a circulating heating device is provided to replace the existing fire main electric heating, which can solve the problem of freezing damage to the fire protection system in cold areas in winter. Compared with the existing technology, it is more energy-efficient and can reduce operating costs.

[0005] Specifically, the following technical solutions are included:

[0006] The embodiment of the first aspect of the present invention provides a circulating heating tunnel fire hydrant network,

[0007] The fire hydrant network of the circulating heating tunnel includes:

[0008] A fire main pipe, the fire main pipe being connected to a fire hydrant via a branch pipe, and the fire main pipe being provided with a first water inlet and a second water inlet;

[0009] a circulating heat supply device, connected to the first water inlet and the second water inlet through water inlet pipes;

[0010] a fire water tank connected to the water inlet pipe;

[0011] The opening and closing of the circulating heating device are controlled according to the temperature inside and outside the tunnel.

[0012] Optionally, the water inlet pipe includes a first water inlet pipe, a second water inlet pipe, and a third water inlet pipe, the fire main pipe includes a first pipe, a third pipe, a second pipe, and a fourth pipe connected in sequence, the first pipe and the second pipe are connected to a fire hydrant through the branch pipe, the first water inlet is connected to the second water inlet pipe, the second water inlet is connected to one end of the third water inlet pipe, and the third water inlet pipe and the second water inlet pipe are connected through the first water inlet pipe; after the water in the first water inlet pipe enters the circulating heating device for heating, it enters the fire main pipe through the third water inlet pipe; the fire water tank is connected to the second water inlet pipe;

[0013] When the tunnel is a double-hole tunnel, the double-hole tunnel includes a first tunnel and a second tunnel, the first pipe is arranged at the bottom corner of the side wall of the first tunnel, and the second pipe is arranged at the bottom corner of the side wall of the second tunnel; when the tunnel is a single-hole tunnel, the first pipe and the second pipe are respectively located at the bottom corners of the two side walls of the tunnel.

[0014] Optionally, multiple first temperature sensors are set in the tunnel, a third temperature sensor is set outside the tunnel, multiple second temperature sensors are set in the fire main pipe, and one second temperature sensor is set at the first water inlet and the second water inlet respectively. The temperature changes along the outside of the fire main pipe are predicted based on the monitoring values of the first temperature sensor and the third temperature sensor, and the opening, heating temperature and flow of the circulating heating device are controlled according to the temperature changes; the heating temperature and flow of the circulating heating device are corrected according to the monitoring values of the second temperature sensor.

[0015] Optionally, a fifth solenoid valve is provided on the first pipe, and the fifth solenoid valve is located between the third water inlet pipe and the second water inlet pipe, and a fourth solenoid valve is provided between the first water inlet pipe and the third water inlet pipe.

[0016] Optionally, the first water inlet pipe is connected to the fifth pipe and then enters the circulating heat supply device. The water after passing through the circulating heat supply device is connected to the third water inlet pipe through the sixth pipe, and the fourth solenoid valve is located between the fifth pipe and the sixth pipe.

[0017] Optionally, the sixth pipeline is provided with a third solenoid valve, and the fifth pipeline is provided with a first solenoid valve.

[0018] Optionally, the second water inlet pipe is connected to the fire water tank through a first connecting pipe and a third connecting pipe, the first connecting pipe is provided with a fire pump, the third connecting pipe is provided with a pressure-stabilizing pump, and the power of the fire pump is greater than the power of the pressure-stabilizing pump.

[0019] Optionally, the circulating heating tunnel fire hydrant network further includes a pressure stabilizing tank, which is arranged at one end of the first water inlet pipe close to the fire water tank.

[0020] Optionally, when the tunnel length is greater than the first distance, multiple circulation sections are set in the tunnel, each of the circulation sections includes a fire-fighting main pipe and a circulating heating device, and the first distance is 5 km to 6 km.

[0021] An embodiment of the second aspect of the present invention provides a method for using a circulating heating tunnel fire hydrant network. Based on the above-mentioned circulating heating tunnel fire hydrant network, the method is divided into three operating conditions: conventional pressure stabilization condition, circulating heating pressure stabilization condition, and firefighting condition. The method includes:

[0022] When the fire hydrant network of the circulating heating tunnel is in the conventional pressure-stabilizing condition: the circulating heating device does not participate in the operation;

[0023] When the fire hydrant pipe network of the circulating heating tunnel is in the circulating heating pressure-stabilizing condition, the circulating heating device starts working;

[0024] When the circulating heating tunnel fire hydrant network is in the fire-fighting condition, the circulating heating device does not participate in the work when a fire occurs. After the fire is over, it is determined whether the circulating heating device participates in the work based on the temperature inside and outside the tunnel and the temperature inside the fire main pipe.

[0025] The embodiment of the present invention provides a circulating heating tunnel fire hydrant network and a method of using the same, wherein the circulating heating tunnel fire hydrant network includes a fire main pipe arranged in the tunnel, the fire main pipe is provided with a first water inlet and a second water inlet, and the circulating heating device is connected to the first water inlet and the second water inlet respectively through the water inlet pipe. When the temperature drops, the circulating heating device can be turned on, and the water in the fire main pipe is caused to flow through the pump of the circulating heating device, so that the water in the water inlet pipe enters the circulating heating device, and the heated water re-enters the fire main pipe, and then the water in the fire main pipe flows into the water inlet pipe again, so that the water in the fire main pipe forms a cycle, achieving the purpose of heating the water in the fire main pipe, and this is repeated, so that the water in the fire main pipe is always kept from freezing. The setting of the circulating heating device can directly heat the water flowing through the fire main pipe, effectively reducing energy consumption, which is more energy-saving on the one hand, and can also reduce operating costs and improve economic efficiency on the other hand. By connecting the fire water tank and switching the valve, it is possible to ensure sufficient water supply in the fire main pipeline in the event of a fire, thereby ensuring the timeliness and reliability of fire extinguishing in the fire main pipeline.

[0026] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A schematic diagram of a fire hydrant network in a circulating heating tunnel according to an embodiment of the present invention;

[0029] Figure 2 is a schematic diagram of a conventional voltage stabilization operating condition according to an embodiment of the present invention;

[0030] Figure 3 A schematic diagram of a circulating heating and pressure stabilization operating condition according to an embodiment of the present invention;

[0031] Figure 4 Schematic diagram of a firefighting condition according to an embodiment of the present invention.

[0032] in, Figures 1 to 4 The corresponding relationship between the reference numerals and component names is as follows:

[0033] 100 Circulating heating tunnel fire hydrant network, 101 First pipeline, 102 Second pipeline, 103 Third pipeline, 104 Fourth pipeline, 105 Fifth pipeline, 106 Sixth pipeline, 107 First water inlet pipeline, 108 Second water inlet pipeline, 109 Circulating heating device, 110 Fire water tank, 111 First solenoid valve, 112 Second solenoid valve, 113 Third solenoid valve, 114 Fourth solenoid valve, 115 Fifth solenoid valve, 116 Pressure regulating tank, 117 First connecting pipeline, 119 Third connecting pipeline, 120 Third water inlet pipeline, 121 Fire pump, 122 Pressure regulating pump, 123 Pressure switch, 124 First rising-stem gate valve, 125 Butterfly valve, 126 Second rising-stem gate valve, 201 First tunnel, 202 Second tunnel, 203 Fire hydrant. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] Before further describing the embodiments of the present invention in detail, the directional terms involved in the embodiments of the present invention, such as "upper part", "lower part" and "side part", do not have the meaning of limiting the scope of protection of the present invention.

[0036] To make the technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0037] Figure 1 Schematic diagram of a fire hydrant network in a circulating heating tunnel according to an embodiment of the present invention.

[0038] like Figure 1 As shown, an embodiment of the present invention provides a circulating heating tunnel fire hydrant network 100.

[0039] The circulating heating tunnel fire hydrant network 100 includes:

[0040] A fire main pipe, the fire main pipe is connected to a fire hydrant 203 via a branch pipe, and the fire main pipe is provided with a first water inlet and a second water inlet;

[0041] The circulating heat supply device 109 is connected to the first water inlet and the second water inlet through water inlet pipes;

[0042] Fire water tank 110, connected to the water inlet pipe;

[0043] The opening and closing of the circulating heating device 109 is controlled according to the temperature inside and outside the tunnel.

[0044] Among them, the circulating heating tunnel fire hydrant network 100 includes a fire main pipe arranged in the tunnel, and the fire main pipe is provided with a first water inlet and a second water inlet. The circulating heating device 109 is connected to the first water inlet and the second water inlet respectively through the water inlet pipe. When the temperature drops, the circulating heating device 109 can be turned on, and the water in the fire main pipe is made to flow through the pump of the circulating heating device 109, so that the water in the water inlet pipe enters the circulating heating device 109, and the water after heating re-enters the fire main pipe, and then the water in the fire main pipe flows into the water inlet pipe again, so that the water in the fire main pipe forms a cycle, achieving the purpose of heating the water in the fire main pipe, and repeating this process, always keeping the water in the fire main pipe from freezing. The setting of the circulating heating device 109 can directly heat the water flowing through the fire main pipe, effectively reducing energy consumption, on the one hand, saving more energy, and on the other hand, reducing operating costs and improving economic efficiency. By connecting the fire water tank 110 and switching the valve, it is possible to ensure sufficient water supply in the fire main pipe when a fire occurs, thereby ensuring the timeliness and reliability of fire extinguishing in the fire main pipe.

[0045] Specifically, the fire water in the closed-loop fire main pipeline formed by the circulating heating device 109 of the present application and the valve control is directly circulated for heating, thereby avoiding water storage and corresponding connecting pipelines. On the one hand, the heat loss of the insulated water tank set up for storing hot water is eliminated, and on the other hand, the length of the pipeline is reduced, which can reduce the walking path of the circulating heating device 109 in the pipeline after heating the water, thereby reducing heat loss and improving the efficiency of heat transfer; the heat loss of the circulating heating device and its connecting pipelines is reduced, which reduces the energy consumption of the circulating heating tunnel fire hydrant pipeline network 100, and is conducive to the requirements of energy conservation and emission reduction.

[0046] In a feasible embodiment, the water inlet pipe includes a first water inlet pipe 107, a second water inlet pipe 108 and a third water inlet pipe 120, the fire main pipe includes a first pipe 101, a third pipe 103, a second pipe 102 and a fourth pipe 104, the first pipe 101 and the second pipe 102 are connected to the fire hydrant 203 through a branch pipe, the first water inlet is connected to the second water inlet pipe 108, the second water inlet is connected to one end of the third water inlet pipe 120, and the third water inlet pipe 120 and the second water inlet pipe 108 are connected through the first water inlet pipe 107; the water in the first water inlet pipe 107 enters the circulating heating device 109 for heating, and then enters the fire main pipe through the third water inlet pipe 120; the fire water tank 110 is connected to the second water inlet pipe 108;

[0047] When the tunnel is a double-hole tunnel, the double-hole tunnel includes a first tunnel 201 and a second tunnel 202, the first pipe 101 is arranged at the bottom corner of the side wall of the first tunnel 201, and the second pipe 102 is arranged at the bottom corner of the side wall of the second tunnel 202; when the tunnel is a single-hole tunnel, the first pipe 101 and the second pipe 102 are respectively located at the bottom corners of the two side walls of the tunnel.

[0048] Among them, when the tunnel is a double-hole tunnel, the circulating heating tunnel fire hydrant network 100 includes a fire main pipe arranged in the double holes, and the fire main pipe includes a first pipe 101, a third pipe 103, a second pipe 102 and a fourth pipe 104 connected in sequence. The first pipe 101 and the second pipe 102 are respectively arranged in the double holes, and in this embodiment, a first water inlet and a second water inlet are provided on the first pipe 101, the first water inlet is connected to the second water inlet pipe 108, the second water inlet is connected to one end of the third water inlet pipe 120, the other end of the third water inlet pipe 120 is connected to the first water inlet pipe 107, and the first water inlet pipe 107 and the second water inlet pipe 108 are connected away from the end of the first pipe 101; it also includes a circulating heating device 109, the first inlet After the water in the water pipe 107 enters the circulating heating device 109 for heating, it enters the fire main pipe through the third water inlet pipe 120. When the temperature drops, the circulating heating device 109 can be turned on. The pump of the circulating heating device 109 allows the water in the fire main pipe to flow, so that the water in the first water inlet pipe 107 enters the circulating heating device 109. The heated water then enters the fire main pipe through the third water inlet pipe 120. Then the water in the fire main pipe flows into the second water inlet pipe 108. Since the second water inlet pipe 108 is connected to the first water inlet pipe 107, the water in the fire main pipe forms a cycle, achieving the purpose of heating the water in the fire main pipe. This is repeated, and the water in the fire main pipe is always kept from freezing. The setting of the circulating heating device 109 can directly heat the water flowing through the fire main pipe, effectively reducing energy consumption. On the one hand, it is more energy-saving, and on the other hand, it can also reduce operating costs and improve economic efficiency.

[0049] Specifically, when the fire main is in a cold area or cold time period, the circulating heating device 109 is turned on to make the water in the fire main flow, so that the water in the first water inlet pipe 107 enters the circulating heating device 109, and the heated water enters the fire main through the third circulation pipe 120. Then, the water in the fire main flows into the second water inlet pipe 108. Since the second water inlet pipe 108 is connected to the first water inlet pipe 107, the water in the fire main forms a cycle, achieving the purpose of heating the water in the fire main, avoiding the freezing of the fire water in the fire main, ensuring the service life and timeliness of the application of the fire main, and avoiding the fire hydrant 203 in the tunnel from being unable to discharge water normally when a fire occurs, thereby affecting the safety of the tunnel. When the tunnel is in a fire condition or there is a water leak in the fire main, the fire water tank 110 will be involved in the work, that is, to replenish water in the fire main to ensure that there is sufficient water in the fire main and that the fire hydrant 203 can effectively extinguish the fire when a fire condition occurs. That is to say, when the fire main pipeline does not leak or the fire hydrant 203 is not working, the water in the fire water tank 110 will not enter the second water inlet pipe 108 and the fire main pipeline.

[0050] It is understandable that according to the second volume of the "Highway Tunnel Design Code", Traffic Engineering and Ancillary Facilities JTG D70 / 2-2014, Article 10.2.3.2, the spacing between fire hydrants 203 in a single-hole highway tunnel should not be greater than 50m. Although this tunnel is a double-hole tunnel, the driving direction of each tunnel is one-way, so the spacing of fire hydrants 203 is arranged according to a single tunnel. Therefore, the spacing of fire hydrants 203 in each tunnel is arranged at every 48m to 50m, and usually 20 fire hydrants 203 are set. The tunnel length should usually be around 1000m.

[0051] It should be noted that when the tunnel is a single-hole, double-lane tunnel, the fire main pipeline includes the first pipeline 101, the third pipeline 103, the second pipeline 102, and the fourth pipeline 104, which are connected in sequence. At this time, the fire hydrants 203 connected to the first pipeline 101 and the second pipeline 102 are both inside the tunnel. At this time, adjacent fire hydrants 203 on the first pipeline 101 can be set at intervals of 96m to 100m. Similarly, adjacent fire hydrants 203 on the second pipeline 102 can be set at intervals of 96m to 100m. The fire hydrants 203 on the first pipeline 101 and the fire hydrants 203 on the second pipeline 102 are spaced apart to ensure that the arrangement of the fire hydrants 203 complies with the requirements of the "Highway Tunnel Design Code". In addition, when the tunnel is a single-hole, double-lane tunnel, the arrangement of other components is the same as that of a double-hole tunnel and will not be repeated here.

[0052] In other words, regardless of the tunnel in which the circulating heating tunnel fire hydrant network 100 is installed, the fire main pipe is a ring-shaped pipe. After connecting to the circulating heating device 109, the pump of the circulating heating device 109 drives the water in the ring-shaped fire main pipe to circulate and heat it, ensuring that the water in the fire main pipe does not freeze even in cold seasons and regions. It is understood that the diameter of the fire main pipe is larger than the diameter of the branch pipe connected to the fire hydrant 203.

[0053] It can be understood that the arrangement of the first water inlet and the second water inlet on the first pipe 101 in the drawings of this embodiment is only an example. In practice, the first water inlet and the second water inlet can be arranged at any position of the fire main pipe as long as they are in a circulating connection with the circulating heating device 109.

[0054] In a feasible embodiment, when the tunnel is a double-hole tunnel, the first pipe 101 is set at the bottom corner of the right wall in the direction of vehicle travel in the first tunnel 201, and the second pipe 102 is set at the bottom corner of the right wall in the direction of vehicle travel in the second tunnel 202.

[0055] It is understandable that according to the "Code for Design of Highway Tunnels", Volume 2, Traffic Engineering and Ancillary Facilities JTG D70 / 2-2014, Article 10.2.3.1, fire hydrant 203 should be fixedly installed in the fire cavern on the right wall of the tunnel along the driving direction. Therefore, there is no need to install it on both sides, thereby reducing installation and maintenance costs while ensuring safety.

[0056] It should be noted that, when the tunnel is usually a single hole, the fire main pipe is also set at the bottom corners of the two side walls of the tunnel.

[0057] In a feasible embodiment, multiple first temperature sensors are set in the tunnel, a third temperature sensor is set outside the tunnel, multiple second temperature sensors are set in the fire main pipe, and a second temperature sensor is set at the first water inlet and the second water inlet respectively. The temperature change along the outside of the fire main pipe is predicted based on the monitoring values of the first temperature sensor and the third temperature sensor, and the opening, heating temperature and flow of the circulating heating device 109 are controlled according to the temperature change; the heating temperature and flow of the circulating heating device 109 are corrected according to the monitoring value of the second temperature sensor.

[0058] Among them, the number of first temperature sensors and second temperature sensors is the same and they are set correspondingly. That is, if a second temperature sensor is set inside the fire main pipe, then a first temperature sensor is set outside the fire main pipe accordingly. This makes it convenient to use multiple first temperature sensors as boundary conditions for prediction.

[0059] Specifically, by learning the historical temperature monitoring data of existing tunnels (temperature inside the tunnel and temperature outside the tunnel), a prediction model is obtained based on the learning. That is, based on the changes in the temperature outside the tunnel and the temperature changes (temperature distribution) along the tunnel (along the fire main), the temperature changes inside the fire main are predicted, the most unfavorable point is found, and the predicted value of the point is used as the condition for opening and closing the circulating heating device 109. At the same time, if the predicted value is different from the set temperature value, the circulating heating device 109 is controlled to change the flow rate and / or heating temperature. The temperature changes along the way can be measured by setting a first temperature sensor at each key point along the fire main outside the fire main (such as the tunnel entrance, multiple points in the tunnel, the first water inlet and the second water inlet), and setting a second temperature sensor at the corresponding position in the fire main. Combined with the monitoring values of the first temperature sensor (temperature inside the tunnel) and the third temperature sensor (temperature outside the tunnel), the temperature changes in the fire main during the next hot water supply cycle are predicted, thereby controlling the flow rate and heating temperature of the circulating heating device 109. In other words, through machine learning of historical temperature data, combined with the actual temperatures measured by the first and third temperature sensors, it is possible to predict the temperature variation and distribution along the fire main pipe during the next cycle, identify the most unfavorable point, and use this to control the opening and closing of circulating heating device 109. Software is also used to calculate the heating temperature and flow rate that circulating heating device 109 should provide at this time under this temperature distribution. The software calculation is a form of programmatic control and is not the subject of protection in this application. Therefore, it will not be further described. This application seeks to protect a method for controlling circulating heating device 109.

[0060] It should be noted that the monitoring value of the second temperature sensor is used to feed back the predictive control effect of the first and third temperature sensors, and the monitoring value of the second temperature sensor is used to correct and control the timing of the operation of the circulating heating device 109 and optimize the heating temperature and flow rate of the circulating heating device 109. For example, after the prediction, the circulating heating device 109 is made to operate at a certain flow rate and a certain heating temperature. Under this operating condition, when the actual temperature of the most unfavorable point monitored by the second temperature sensor is still lower than the set temperature value, the heating temperature or flow rate of the circulating heating device 109 is increased. When the actual temperature of the most unfavorable point monitored by the second temperature sensor is higher than the set temperature value, the heating temperature and flow rate of the circulating heating device 109 are reduced. This can improve the energy-saving effect of the circulating heating device 109, improve its economic efficiency, and simultaneously achieve intelligent control, reduce human intervention, and improve efficiency.

[0061] It is understandable that the most unfavorable point may be at the tunnel entrance or the first water inlet (the final outlet of the water cycle). Since the pipelines where the first and second water inlets are located may be buried underground, in some special cases, the temperature monitored by the first temperature sensor at the first water inlet may be higher than the temperature monitored by the first sensor at the tunnel entrance. The historical temperature monitoring data can be learned based on data from six months to one year.

[0062] Furthermore, based on forecasts, circulating heating device 109 can be activated in advance to ensure that the water in the fire main pipe never freezes. At the same time, if the temperature at the most unfavorable point in the fire main pipe remains above 5°C, the heater of circulating heating device 109 can be turned off, but the circulating pump of circulating heating device 109 remains on. When the temperature at the tunnel entrance outside the fire main pipe falls below -5°C to 0°C, the heater of circulating heating device 109 is turned back on. When the temperature at the tunnel entrance rises above 0°C to 2°C, circulating heating device 109 is shut down and no longer used, returning the circulating heating pressure-stabilized operating mode to the normal pressure-stabilized operating mode of the circulating heating tunnel fire hydrant network 100.

[0063] It is understandable that due to the potential for errors between learning and actual practice, the set temperature value is set between -5°C and 0°C, that is, when the temperature at the tunnel entrance outside the fire main is lower than -5°C to 0°C, the circulating heating device 109 can be turned on, which can prevent the fire main from freezing due to the error. In other words, by leaving a margin for the set temperature value, the circulating heating device 109 can be turned on in advance, preventing the fire main from freezing and affecting the opening of the fire-fighting mode of the circulating heating tunnel fire hydrant network 100. At the same time, if the ambient temperature is always below a certain temperature, the circulating heating device 109 can be kept on at the lowest flow rate.

[0064] For example, an electric heating tape can be installed on the outer wall of the branch pipeline for insulation, reducing the area of the electric heating tape used, thereby reducing operating costs. At the same time, because of the circulating heating device 109, the power of the electric heating tape can be appropriately reduced, which can also achieve the purpose of energy saving.

[0065] For example, the second temperature sensor at the second water inlet typically monitors the highest temperature, while the second temperature sensor at the first water inlet or the hole monitors the lowest temperature. As the number of water circulation cycles increases, the temperature difference between the second temperature sensors gradually decreases, and the temperature gradually rises, causing the temperature of the first temperature sensor to change as well. The measured values of the third temperature sensor and the first temperature sensor are then used to predict the temperature change outside the fire main pipe during the next cycle. This process is repeated to control the flow rate and heating speed of the circulating heating device.

[0066] It is understood that machine learning can be achieved by collecting and processing data, then adding some conditions such as wind speed and direction, and then using machine learning to establish a prediction model for the relevant data. The accuracy of the model can be verified by multiple measured data before use, thereby improving the accuracy of the prediction. This learning method is an existing technology. Since the learning process is not the focus of protection in this application, it will not be described in detail. The protection here is the logic of learning through the provided temperature sensor.

[0067] In a feasible embodiment, a fifth solenoid valve 115 is provided on the first pipe 101 , and the fifth solenoid valve 115 is located between the third water inlet pipe 120 and the second water inlet pipe 108 , and a fourth solenoid valve 114 is provided between the first water inlet pipe 107 and the third water inlet pipe 120 .

[0068] The circulating heating device 109, the fourth solenoid valve 114, and the fifth solenoid valve 115 enable switching between over 100 operating modes in the circulating heating tunnel fire hydrant network. These three operating modes include conventional pressure stabilization, circulating heating pressure stabilization, and firefighting.

[0069] It should be noted that when the circulating heating tunnel fire hydrant network 100 is in a normal pressure-stabilizing state, the circulating heating device 109 is not turned on, and the fourth solenoid valve 114 and the fifth solenoid valve 115 are turned on, so that the fire main pipe is completely filled with water and the pressure is stable. Then, the water in the fire main pipe hardly flows. Figure 2When the circulating heating tunnel fire hydrant network 100 is in the circulating heating and pressure-stabilizing operating state, the circulating heating device 109 is turned on, the fourth electric valve 114 and the fifth electric valve 115 are closed, and the water in the fire main pipe begins to flow. After entering the first water inlet pipe 107 through the second water inlet pipe 108, the water enters the circulating heating device 109. After being heated by the circulating heating device 109, the water passes through the third water inlet pipe 120 and sequentially enters part of the first pipe 101, the third pipe 103, the second pipe 102, the fourth pipe 104, and another part of the first pipe 101 before entering the second water inlet pipe 108. This cycle continues, thereby heating the water in the fire main pipe and preventing water from freezing in the fire main pipe. When the circulating heating tunnel fire hydrant network 100 is in a fire-fighting state, the fourth solenoid valve 114 and the fifth solenoid valve 115 are opened within 30 seconds of the occurrence of the fire, and the third solenoid valve 113 and the circulating heating device 109 are closed within 30 seconds. After the fire is over, the fourth solenoid valve 114 and the fifth solenoid valve 115 are closed, and at the same time, it is determined whether to open the circulating heating device 109 based on the temperature monitored by the third temperature sensor. Whether the circulating heating device 109 is opened is as described above and will not be described in detail. That is to say, if the third temperature sensor reaches the first low temperature, the circulating heating device 109 can be opened according to the learning time and enter the circulating heating pressure-stabilizing state. If the third temperature sensor does not reach the first low temperature, or the second temperature sensor is not lower than the second low temperature, the circulating heating device 109 will not be opened. At this time, the circulating heating tunnel fire hydrant network 100 is in a conventional pressure-stabilizing state.

[0070] It's understandable that after a fire breaks out, the circulating heating tunnel fire hydrant network 100 must be immediately restored to firefighting conditions. According to Article 7.1.6.1 of the "Technical Specifications for Fire Water Supply and Fire Hydrant Systems" (GB 50974-2014), the opening time of solenoid valves should not exceed 30 seconds. Immediately closing the fourth and fifth solenoid valves 114 and 115 after the fire is extinguished is to quickly restore the system to normal, stable pressure conditions. The decision to activate the circulating heating device 109 is based on actual temperature conditions.

[0071] It can be understood that when in a non-low temperature environment, the circulating heating device 109 is not turned on, that is, the first solenoid valve 111, the second solenoid valve 112 and the third solenoid valve 113 are closed, and the fourth solenoid valve 114 and the fifth solenoid valve 115 are opened, so that the normal pressure-stabilized working condition is restored in the fire main pipeline.

[0072] It should be noted that when the tunnel is a single-hole tunnel, the settings of the fire main pipeline, the circulating heating device 109 and the water inlet pipeline are the same as those of the double-hole tunnel, the settings of the valves are the same as those of the double-hole tunnel, and the principles are the same and will not be repeated below.

[0073] In a feasible embodiment, the first water inlet pipe 107 is connected to the fifth pipe 105 and then enters the circulating heating device 109. The water after passing through the circulating heating device 109 is connected to the third water inlet pipe 120 through the sixth pipe, and the fourth solenoid valve is located between the fifth pipe and the sixth pipe.

[0074] Among them, the fourth solenoid valve 114 is located between the first water inlet pipe 107 and the third water inlet pipe 120, and the fourth solenoid valve 114 is located between the fifth pipe 105 and the sixth pipe 106. When it is necessary to start the circulating heating device 109, in order to allow the water in the fire main pipe to pass through the circulating heating device 109 and then enter the fire main pipe, that is, the water can form a cycle in the fire main pipe, the second water inlet pipe 108, the first water inlet pipe 107, the circulating heating device 109, the third water inlet pipe 120 and the fire main pipe, it is necessary to close the fourth solenoid valve 114 and the fifth solenoid valve 115 at this time.

[0075] In a feasible implementation, the sixth pipeline 106 is provided with a third solenoid valve 113 , and the fifth pipeline 105 is provided with a first solenoid valve 111 .

[0076] Among them, a first solenoid valve 111 is set in front of the inlet of the circulating heating device 109, and a third solenoid valve 113 is set after the outlet of the circulating heating device 109. The opening and closing of the circulating heating device 109 are controlled by the first solenoid valve 111, and the third solenoid valve 113 serves to block the continued flow of water.

[0077] It should be noted that, based on the practical requirement of one in use and one in backup, two sets of circulating heating devices 109 are provided in this embodiment: a first circulating heating device and a second circulating heating device. A first solenoid valve 111 is provided before the inlet of the first circulating heating device, and a second solenoid valve 112 is provided before the inlet of the second circulating heating device (backup). The outlets of both circulating heating devices 109 are connected to a single sixth pipeline 106, so a third solenoid valve 113 is provided on the sixth pipeline 106. It is understandable that only one first solenoid valve 111 and one second solenoid valve 112 are provided. Since the circulating heating devices 109 already utilize a one-in-use, one-in-backup configuration, providing only one solenoid valve can also meet replacement and maintenance requirements, while also improving the economic efficiency of the circulating heating tunnel fire hydrant network 100. The third solenoid valve 113, the fourth solenoid valve 114, and the fifth solenoid valve 115 primarily function to control the direction of water flow within the fire main pipeline, so only one is required.

[0078] Among them, the first solenoid valve 111 to the fifth solenoid valve 115 are all controlled to open and close by the controller. The solenoid valves that are opened and closed are selected according to the required working conditions, which can realize the simultaneous opening and closing of multiple solenoid valves, improve the efficiency of opening and closing of the solenoid valves, and improve the intelligence level of the circulating heating tunnel fire hydrant network 100.

[0079] In a feasible embodiment, the second water inlet pipe 108 is connected to the fire water tank 110 through the first connecting pipe 117 and the third connecting pipe 119. A fire pump 121 is provided on the first connecting pipe 117, and a pressure-stabilizing pump 122 is provided on the third connecting pipe 119. The power of the fire pump 121 is greater than the power of the pressure-stabilizing pump 122.

[0080] Among them, according to the principle of one in use and one in reserve, two first connecting pipes 117 can be set up, and a fire pump 121 can be set on each first connecting pipe 117, so that two fire pumps 121 can be set up; similarly, two third connecting pipes 119 can be set up, and a pressure-stabilizing pump 122 can be set on each third connecting pipe 119, so that two pressure-stabilizing pumps 122 can be set up, which can ensure the reliability and stability of the operation of the circulating heating tunnel fire hydrant network 100.

[0081] It should be noted that the power of fire pump 121 is greater than that of pressure-stabilizing pump 122. When the circulating heating tunnel fire hydrant network 100 is in firefighting mode, fire pump 121 starts, pumping sufficient water from the fire water tank 110 into the fire hydrants 203 for firefighting. Once the fire is extinguished and the fire main line is filled with water, fire pump 121 shuts down. At this point, pressure-stabilizing pump 122 stabilizes the pressure in the fire main line, ensuring pressure stability and, consequently, the safety and service life of the fire main line.

[0082] In a feasible implementation manner, a pressure switch 123 and a first rising-stem gate valve 124 are provided on the first communicating pipe 117 , and a second rising-stem gate valve 126 is provided on the third communicating pipe 119 .

[0083] The pressure switch 123 is located near the second water inlet pipe 108. A first rising-stem gate valve 124 is installed on both sides of the fire pump 121, and a second rising-stem gate valve 126 is installed on both ends of the pressure-stabilizing pump 122. It is understood that the first rising-stem gate valve 124 and the second rising-stem gate valve 126 are normally open valves and are closed only when the fire pump 121 and / or the pressure-stabilizing pump 122 require maintenance. The rising-stem gate valves are also installed in accordance with the requirements of the standard atlas 19S204-1, "Selection and Installation of Fire-Fighting Water Pumps," and will not be further described.

[0084] It should be noted that a pressure switch 123 is provided on the first connecting pipe 117 where the fire pump 121 is located, which is used to control the start-up of the fire pump 121 according to the pressure of the system. This can improve the accuracy of starting the fire pump 121, while ensuring the timeliness of fire extinguishing, reducing energy consumption and improving the economy of the circulating heating tunnel fire hydrant network 100.

[0085] It is understandable that the first rising stem gate valve 124 at both ends of the fire pump 121 and the second rising stem gate valve 126 at both ends of the pressure regulating pump are normally open valves and can be manually closed when maintenance is required.

[0086] For example, four butterfly valves 125 are provided on the second water inlet pipe 108. These butterfly valves 125 are located between the first connecting pipe 117 and the first pipe 101, between the two first connecting pipes 117, between the first connecting pipe 117 and the third connecting pipe 119, and between the two third connecting pipes 119. The provision of these butterfly valves 125 facilitates maintenance or isolation in the event of a malfunction in the circulating heating tunnel fire hydrant network 100, allowing for separate maintenance of each component. It will be appreciated that the four butterfly valves 125 are typically normally open and can be manually closed for maintenance or in the event of a malfunction.

[0087] In a feasible embodiment, the circulating heating tunnel fire hydrant network 100 further includes a pressure stabilizing tank 116 , which is disposed at one end of the first water inlet pipe 107 close to the fire water tank 110 .

[0088] Among them, through the setting of the pressure-stabilizing tank 116, the stability of the pressure of the circulating heating tunnel fire hydrant network 100 can be maintained. When the system pressure drops to a certain level, the pressure-stabilizing tank 116 can automatically start the booster pump to increase the system pressure until the system pressure reaches the set pressure; the pressure-stabilizing tank 116 can also reduce the frequent starting and stopping of the pressure-stabilizing pump 122, that is, as a supplement to the pressure-stabilizing pump 122, it can extend the service life of the pressure-stabilizing pump 122 and reduce energy consumption at the same time; the pressure-stabilizing tank 116 can also adjust the working pressure of the system to ensure that when a fire occurs, the fire hydrant 203 can quickly obtain sufficient water pressure and water volume, thereby ensuring the stability and reliability of the fire extinguishing effect; in the circulating heating tunnel fire hydrant network 100, due to the sudden change in water flow direction, water hammer phenomenon is easily generated, resulting in damage to the fire main pipeline. The pressure-stabilizing tank can absorb pressure fluctuations, reduce the impact of water hammer phenomenon on the system, and maintain the safety and service life of the fire main pipeline.

[0089] Specifically, four pressure control points, p1, p2, ps1, and ps2, are set in the pressure-sustaining tank 116. Each pressure control point is connected to a control relay. p1 is the minimum design working pressure of the pressure-sustaining tank 116, p2 is the starting pressure of the fire pump 121, ps1 is the starting pressure of the pressure-sustaining pump 122, and ps2 is the stopping pressure of the pressure-sustaining pump 122. When the pressure in the pressure-sustaining tank 116 is ps2, the circulating heating tunnel fire hydrant network 100 is in a relatively high pressure state, and the pressure-sustaining pump 122 and the fire pump 121 are both in a non-working state (not started). As the pressure in the circulating heating tunnel fire hydrant network 100 drops from ps2 to ps1 due to infiltration or leakage caused by other reasons, the pressure in the pressure-sustaining tank 116 drops from ps2 to ps1, and the pressure-sustaining pump 122 starts to replenish water to the pressure-sustaining tank 116 until the pressure in the pressure-sustaining tank 116 reaches ps2, at which point the pressure-sustaining pump 122 stops working, thereby ensuring the constant storage of fire water in the pressure-sustaining tank 116. When a fire occurs in the tunnel, as the fire hydrant 203 equipment is turned on to use water, the water volume in the circulating heating tunnel fire hydrant network 100 is reduced, and the system pressure continues to drop. When it drops from ps2 to p2, an alarm is sounded and a signal is output to the fire control center, automatically starting (pressure switch 123 is turned on) the fire pump 121 to supply water to the fire main pipeline. When the fire pump 121 is started, the pressure regulating pump 122 automatically stops running.

[0090] In a feasible embodiment, when the tunnel length is greater than the first distance, multiple circulation sections are set in the tunnel, each circulation section includes a fire main pipeline and a circulation heating device 109, and the first distance is 5km to 6km.

[0091] That is to say, when the tunnel is a long tunnel, that is, when the tunnel length exceeds the first distance, multiple circulation sections can be set to ensure the normal operation of the circulating heating tunnel fire hydrant network 100, and the fire main pipeline can be divided into multiple circulation sections, and each circulation section is equipped with a circulating heating device 109 to ensure the liquid state of the water in the fire main pipeline, to avoid the freezing of water in the fire main pipeline, which on the one hand affects the service life of the fire main pipeline, and on the other hand, when a fire occurs, the fire main pipeline cannot be quickly extinguished, resulting in serious consequences. Therefore, a circulation section is usually divided at intervals of 5km to 6km, and the circulation section includes a fire main pipeline and a circulating heating device 109, wherein the settings of each valve are the same as above and will not be repeated. Multiple circulating heating devices 109 respectively heat the water in the fire main pipeline connected to themselves, which can improve the heating circulation speed of the fire main pipeline in the long tunnel.

[0092] It can be understood that the above drawings are drawn based on a double-hole tunnel, and the principles and configuration of each component of a single-hole lane and a long tunnel are the same.

[0093] Figure 2 is a schematic diagram of a conventional voltage stabilization operating condition according to an embodiment of the present invention; Figure 3 A schematic diagram of a circulating heating and pressure stabilization operating condition according to an embodiment of the present invention; Figure 4 Schematic diagram of a firefighting condition according to an embodiment of the present invention.

[0094] like Figures 2 to 4 As shown, another embodiment of the present invention provides a method for using a circulating heating tunnel fire hydrant network. Based on the above-mentioned circulating heating tunnel fire hydrant network 100, the method of use is divided into three working conditions, namely conventional pressure stabilization condition, circulating heating pressure stabilization condition and fire fighting condition. The method of use includes:

[0095] When the circulating heating tunnel fire hydrant network 100 is in a normal pressure-stabilizing condition: the circulating heating device 109 does not participate in the operation;

[0096] When the circulating heating tunnel fire hydrant network 100 is in the circulating heating and pressure stabilization mode, the circulating heating device 109 participates in the operation;

[0097] When the circulating heating tunnel fire hydrant network 100 is in fire-fighting mode, the circulating heating device 109 does not participate in the work when a fire occurs. After the fire is over, it is determined whether the circulating heating device 109 participates in the work based on the temperature in the tunnel and the temperature in the fire main pipeline.

[0098] Specifically, the above-mentioned circulating heating tunnel fire hydrant network 100 can be applied to three working conditions. Figure 2 As shown, the first operating condition is a conventional pressure-stabilizing condition under non-low-temperature conditions: in this case, the fourth and fifth solenoid valves 114, 115 are normally open, while the first, second, and third solenoid valves 111, 112, and 113 are closed. The fire main pipe is completely filled with water, and the pressure in the pressure-surge tank 116 is at ps2, indicating that the circulating heating tunnel hydrant network 100 is at a relatively high pressure. At this time, neither the pressure-surge pump 122 nor the fire pump 121 is turned on. The water in the fire main pipe is essentially static, and its temperature is above 5°C, so the circulating heating device 109 is not operating.

[0099] like Figure 3As shown, the second working condition is when the temperature in the tunnel and / or the temperature in the fire main pipe is low, that is, when it is in a cold season or a cold area, the circulating heating tunnel fire hydrant network 100 enters the circulating heating and pressure stabilization working condition. At this time, the fourth solenoid valve 114 and the fifth solenoid valve 115 are closed, and the first solenoid valve 111 (or the second solenoid valve 112) and the third solenoid valve 113 are opened. The power device of the circulating heating device 109 makes the water in the fire main pipe flow, and passes through the first water inlet pipe 107, the fifth pipe 105, the circulating heating device 109, the sixth pipe 106, the third water inlet pipe 120, the second water inlet, part of the first pipe 101, the third pipe 103, the second pipe 102, the fourth pipe 104, another part of the first pipe 101, and then enters the second water inlet pipe 108 through the first water inlet and then enters the first water inlet pipe 107, so that the water in the fire main pipe circulates continuously ( Figure 3 The arrow in the middle indicates the direction of water flow. At this point, since the pressure within the fire main pipeline and circulating heating device 109 is stable, neither pressure-stabilizing pump 122 nor fire pump 121 is required to operate. It is understood that circulating heating device 109 may be a heat exchanger, which allows the water in fifth pipeline 105 to be heated before entering sixth pipeline 106 and then the fire main pipeline. This prevents freezing of the water in the fire main pipeline due to low temperatures, thereby improving the safety and reliability of the circulating heating tunnel fire hydrant network 100 in cold conditions.

[0100] It can be understood that when the flow rate of the circulating heating device 109 is gradually reduced, and the temperature of the second temperature sensor is always not lower than the first low temperature, the first solenoid valve 111 (or the second solenoid valve 112) and the third solenoid valve 113 can be closed again, and the fourth solenoid valve 114 and the fifth solenoid valve 115 can be opened at the same time to return to the normal voltage stabilization condition.

[0101] like Figure 4As shown, the third operating condition is when a fire occurs in the tunnel, and the circulating heating tunnel fire hydrant network 100 enters the firefighting mode. At this time, the fourth solenoid valve 114 and the fifth solenoid valve 115 must be opened within 30 seconds of the fire outbreak, while the first solenoid valve 111 (or the second solenoid valve 112) and the third solenoid valve 113 must be closed within 30 seconds of the fire outbreak. After the fire ends, the fourth solenoid valve 114 and the fifth solenoid valve 115 are closed. At the same time, based on whether the third temperature sensor reaches the first low temperature and the time it takes for the water in the fire main pipeline to circulate once, it is determined whether to open the circulating heating device 109, causing the circulating heating tunnel fire hydrant network 100 to enter the circulating heating and pressure-stabilizing operating condition. If the circulating heating device 109 does not need to be opened, the fourth solenoid valve 114 and the fifth solenoid valve 115 are opened, and the circulating heating tunnel fire hydrant network 100 returns to the normal pressure-stabilizing operating condition. Because the water in the fire main is used to discharge water from fire hydrants 203, the amount of water in pressure-surge tank 116 decreases, and the pressure continues to drop, causing the pressure in the fire main to quickly drop to p2. Simultaneously with the alarm, a signal is output to the fire control center, causing pressure switch 123 to open, starting fire pump 121. After fire pump 121 is turned on, pressure-surge pump 122 stops operating. At this point, water in fire tank 110 is rapidly pumped into the fire main, completing the fire extinguishing operation. After the fire is extinguished, fire hydrant 203 is closed. In cold conditions, the fourth and fifth solenoid valves 114, 115 are immediately closed after fire hydrant 203 is closed, while the first and third solenoid valves 111 (or second and third solenoid valves 112, 113) are simultaneously opened, allowing the circulating heating device 109 to participate in heating the water in the fire main. In non-cold conditions, after fire hydrant 203 is closed, the circulating heating tunnel fire hydrant network 100 returns to its normal pressure-surge condition.

[0102] It is understandable that when the pressure switch 123 automatically turns on the fire pump 121, it is related to the pressure of the circulating heating tunnel fire hydrant network 100, but when the fire pump 121 is turned off, it is manually turned off. It is manually turned off based on the actual situation at the scene (that is, the fire is completely extinguished) and has nothing to do with the pressure situation.

[0103] It should be noted that the cold condition refers to a condition where the monitoring value of the third temperature sensor can reach a first low temperature, and the non-cold condition refers to a condition where the monitoring value of the third temperature sensor is always higher than the first low temperature. Figure 4 The direction of the middle arrow is the direction of water flow during firefighting conditions.

[0104] For example, Figure 4The diagram only shows the direction of water flow in a fire-fighting condition. In the fire-fighting condition, when only one fire hydrant 203 or part of the fire hydrants 203 are used, the fifth solenoid valve 115 is in the open state, so that the fire main pipeline is arranged in a ring shape. At this time, the pressure in the fire main pipeline changes due to the water outflow, and the water in the first water inlet pipeline 107, the second water inlet pipeline 108 and the third water inlet pipeline 120 will all flow toward the open fire hydrant 203, that is, the water flow direction changes. Therefore, the fourth solenoid valve 114 and the fifth solenoid valve 115 are opened, and there is no restriction on the water flow direction, so that the fire-fighting water can flow out of the open fire hydrant 203 more promptly, which helps to improve the timeliness and reliability of fire extinguishing. Since the water flow direction changes, the pressure-stabilizing tank 116 can prevent the occurrence of water hammer and protect the safety of the fire main pipeline. It should be noted that in the circulating heating condition, it is necessary to force the water flow to be completely as Figure 3 In this case, the fifth solenoid valve 115 needs to be closed.

[0105] It is understandable that in addition to fire-fighting conditions, the water flow may change. When a fire main pipeline leaks, the water flow will also change direction due to changes in the pressure in the fire main pipeline, and flow toward the leakage port. At this time, the pressure-stabilizing tank 116 can also ensure the balance of pressure, avoid water hammer, and ensure the safety and reliability of the fire main pipeline.

[0106] In the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0107] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as illustrative only.

[0108] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A circulating heating tunnel fire hydrant network, characterized in that: The fire hydrant network of the circulating heating tunnel includes: A fire main pipe, the fire main pipe being connected to a fire hydrant via a branch pipe, and the fire main pipe being provided with a first water inlet and a second water inlet; a circulating heat supply device, connected to the first water inlet and the second water inlet through water inlet pipes; a fire water tank connected to the water inlet pipe; The opening and closing of the circulating heating device are controlled according to the temperature inside and outside the tunnel.

2. The circulating heating tunnel fire hydrant network according to claim 1 is characterized in that: The water inlet pipeline includes a first water inlet pipeline, a second water inlet pipeline, and a third water inlet pipeline. The fire main pipeline includes a first pipeline, a third pipeline, a second pipeline, and a fourth pipeline connected in sequence. The first pipeline and the second pipeline are connected to the fire hydrant through the branch pipeline. The first water inlet is connected to the second water inlet pipeline, the second water inlet is connected to the third water inlet pipeline, and the third water inlet pipeline and the second water inlet pipeline are connected through the first water inlet pipeline. After the water in the first water inlet pipeline enters the circulating heating device for heating, it enters the fire main pipeline through the third water inlet pipeline. The fire water tank is connected to the second inlet pipeline. When the tunnel is a double-hole tunnel, the double-hole tunnel includes a first tunnel and a second tunnel, the first pipe is arranged at the bottom corner of the side wall of the first tunnel, and the second pipe is arranged at the bottom corner of the side wall of the second tunnel; when the tunnel is a single-hole tunnel, the first pipe and the second pipe are respectively located at the bottom corners of the two side walls of the tunnel.

3. The circulating heating tunnel fire hydrant network according to claim 2 is characterized in that: A plurality of first temperature sensors are arranged in the tunnel, a third temperature sensor is arranged outside the tunnel, a plurality of second temperature sensors are arranged in the fire main pipe, and a second temperature sensor is arranged at the first water inlet and the second water inlet respectively. The temperature change along the outer side of the fire main pipe is predicted based on the monitoring values of the first temperature sensor and the third temperature sensor, and the opening, heating temperature and flow of the circulating heating device are controlled based on the temperature change; the heating temperature and flow of the circulating heating device are corrected based on the monitoring value of the second temperature sensor.

4. The circulating heating tunnel fire hydrant network according to claim 2 is characterized in that: A fifth solenoid valve is provided on the first pipe, and the fifth solenoid valve is located between the third water inlet pipe and the second water inlet pipe. A fourth solenoid valve is provided between the first water inlet pipe and the third water inlet pipe.

5. The circulating heating tunnel fire hydrant network according to claim 4 is characterized in that: The first water inlet pipe is connected with the fifth pipe and then enters the circulating heat supply device. The water after passing through the circulating heat supply device is connected with the third water inlet pipe through the sixth pipe. The fourth solenoid valve is located between the fifth pipe and the sixth pipe.

6. The circulating heating tunnel fire hydrant network according to claim 5 is characterized in that: The sixth pipeline is provided with a third solenoid valve, and the fifth pipeline is provided with a first solenoid valve.

7. The circulating heating tunnel fire hydrant network according to claim 2 is characterized in that: The second water inlet pipe is connected to the fire water tank through a first connecting pipe and a third connecting pipe. A fire pump is provided on the first connecting pipe, and a pressure-stabilizing pump is provided on the third connecting pipe. The power of the fire pump is greater than that of the pressure-stabilizing pump.

8. The circulating heating tunnel fire hydrant network according to claim 2 is characterized in that: The circulating heating tunnel fire hydrant network also includes a pressure stabilizing tank, which is arranged at one end of the first water inlet pipe close to the fire water pool.

9. The circulating heating tunnel fire hydrant network according to any one of claims 1 to 8, characterized in that: When the tunnel length is greater than the first distance, multiple circulation sections are set in the tunnel, each of the circulation sections includes a fire-fighting main pipeline and a circulation heating device, and the first distance is 5km to 6km.

10. A method for using a circulating heating tunnel fire hydrant network, based on the circulating heating tunnel fire hydrant network according to any one of claims 1 to 9, wherein the method is divided into three operating conditions, namely, a conventional pressure stabilization condition, a circulating heating pressure stabilization condition, and a firefighting condition, and is characterized in that: The method of use includes: When the fire hydrant network of the circulating heating tunnel is in the conventional pressure-stabilizing condition: the circulating heating device does not participate in the operation; When the fire hydrant pipe network of the circulating heating tunnel is in the circulating heating pressure-stabilizing condition, the circulating heating device starts working; When the circulating heating tunnel fire hydrant network is in the fire-fighting condition, the circulating heating device does not participate in the work when a fire occurs. After the fire is over, it is determined whether the circulating heating device participates in the work based on the temperature inside and outside the tunnel and the temperature inside the fire main pipe.

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