Design method of multifunctional pool for bridge water treatment

Abstract

According to the design method of the multifunctional pool for bridge water treatment, the volume of the emergency pool is comprehensively considered according to the fire-fighting requirements in combination with the hazardous chemical volume parameters and the actual conditions of rainy and snowy days, and a better volume design structure of the emergency pool is obtained under the standard that toxic wastewater is temporarily stored enough and is not discharged; over design or insufficient volume is avoided, discharge and storage of deicing salt water in snowy days are taken into consideration, collection and disposal requirements of hazardous chemical waste liquid and deicing salt waste liquid under various working conditions under design standards can be met, multifunctionality is realized, and reasonable design value enables the multifunctional pool to be scientific and reasonable in structure, compact in arrangement, safe, reliable, economical, moderate and convenient to maintain. And the occupied space of the multifunctional pool is greatly reduced, so that the construction cost is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge water treatment, and particularly relates to a design method of a multifunctional pool for bridge water treatment. BACKGROUND

[0002] In the field of bridge maintenance in winter and safety management of hazardous chemical transportation, there are two core technical pain points of "contradiction between deicing demand and ecological protection" and "disconnection between hazardous chemical leakage emergency and resource recycling", and existing solutions cannot balance safety, environmental protection and economy. At present, for bridges crossing sensitive water bodies, the industry has gradually promoted hazardous chemical transportation vehicle emergency pools, but they cannot comprehensively treat rainwater, oil sludge and deicing salt wastewater, and if separate unit pools are set up for separate treatment, the land space and cost are large, so a multifunctional pool integrating multiple working conditions for treatment is needed.

[0003] When designing the emergency pool of the multifunctional pool, the design of the pool capacity usually only considers the volume of the hazardous chemical tank, so that in actual field, other factors such as fire water and rainwater will affect the final water volume, leading to overflow of toxic wastewater and secondary pollution, so this design lacks scientificity; and simply expanding the volume will greatly increase the construction cost and land area, so this design lacks economy.

[0004] Therefore, it is necessary to provide a design method of a multifunctional pool for bridge water treatment to solve or at least alleviate the above problems. SUMMARY

[0005] The main purpose of the present application is to provide a design method of a multifunctional pool for bridge water treatment to solve the problems of lack of scientificity and economy in the design method of the multifunctional pool in the prior art.

[0006] To achieve the above purpose, the present application provides a design method of a multifunctional pool for bridge water treatment, comprising the steps of:

[0007] S1, determining the hazardous chemical transportation vehicle tank load volume V1 passing through a single bridge section;

[0008] S2, calculating the fire rescue water volume V2 of the single bridge;

[0009] S3, calculating the rainfall V3 in the bridge catchment area;

[0010] S4, determining the design pool capacity V of the emergency pool 应急 ; wherein the overflow hole is arranged on the side wall connecting the emergency pool and the deicing salt pool, and the overflow hole is used for temporarily storing the additional rainfall of the hazardous chemical transportation vehicle accident in the deicing salt pool, V 应急 = V1+V2;

[0011] S5, calculating the bridge deck ice-melting water volume V4;

[0012] S6, determining the design pool volume V 除冰 of the deicing salt pool. 除冰 = max(V3, V4).

[0013] Preferably, the step S1 specifically comprises the steps of:

[0014] S11, determining regional hazardous chemical transportation vehicle record information;

[0015] S12, taking the maximum value according to each of the hazardous chemical transportation vehicle record information to obtain a hazardous chemical transportation vehicle tank load volume V1.

[0016] Preferably, the step S2 specifically comprises the steps of:

[0017] S21, obtaining a fire unit time length water volume and a fire average time length according to regional hazardous chemical vehicle fire requirements to determine a fire rescue design water volume V2design;

[0018] S22, obtaining a distance from the emergency pool to a hazardous chemical waste liquid transfer station to determine a waste liquid transfer time, and calculating a fire actual water volume V2actual according to the fire unit time length water volume;

[0019] S23, determining a fire rescue water volume V2= min(V 2设计 , V 2实际 ).

[0020] Preferably, the step S3 specifically comprises the steps of:

[0021] S31, obtaining a rainfall within a single bridge water collection area according to a formula

[0022] wherein F is a single bridge water collection area, H is a corresponding rainfall under a design annual runoff control rate, and is a bridge runoff coefficient.

[0023] Preferably, a bottom edge height h 底 of the overflow hole is (V1+V2) / S 应急 ; wherein S 应急 is an area of the emergency pool.

[0024] Preferably, two sides of the emergency pool are respectively used for connecting drainage of two bridge decks.

[0025] Preferably, the step S5 specifically comprises the steps of:

[0026] S51, obtaining a bridge deck ice-melting water volume V4according to a formula

[0027] ​Wherein, F' is the double-width bridge deck area, h is the snow thickness under the design standard.

[0028] Preferably, one corner end of the deicing salt water pool is recessed to form a purification and reuse pump pit, an outer side enclosure of the purification and reuse pump pit is provided with a filter plate, the filter plate is in a bent shape, and the filter plate itself has filter holes.

[0029] Preferably, the average length of the fire protection is greater than or equal to 2 hours.

[0030] Preferably, the bridge water treatment multifunctional water pool further comprises a distribution pool and a sand and oil separation pool, the distribution pool is used to communicate with the bridge deck, and the distribution pool, the sand and oil separation pool, the emergency pool and the deicing salt water pool are respectively and closably communicated.

[0031] Compared with the prior art, the bridge water treatment multifunctional water pool has the following beneficial effects:

[0032] The design method of the bridge water treatment multifunctional water pool provided by the application is as follows: according to the fire protection requirements, the volume of the emergency pool is comprehensively considered in combination with the volume parameters of the hazardous chemicals and the actual situation of the snow and rain, the optimal volume design structure of the emergency pool is obtained under the condition that the sufficient temporary storage of the toxic wastewater is ensured and the toxic wastewater is not discharged, the excessive design or insufficient volume is avoided, the discharge and storage of the deicing salt water in the snow are considered at the same time, the collection and disposal requirements of the hazardous chemical wastewater and the deicing salt wastewater under various working conditions of the design standard are met, the multifunctionality is realized, the multifunctional water pool is reasonably designed and valued, the structure of the multifunctional water pool is scientific and reasonable, the layout is compact, the multifunctional water pool is safe and reliable, economic and moderate, and the maintenance is convenient, the land occupation of the multifunctional water pool is greatly reduced, and the construction cost is saved. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without any creative effort.

[0034] Figure 1 The figure is a flowchart of the design method in the application;

[0035] Figure 2 The figure is a plane schematic view of the overall structure in an embodiment of the application;

[0036] Figure 3 The figure is Figure 2 The figure is a sectional view along the A-A direction in the application;

[0037] Figure 4 The figure is Figure 2A cross-sectional view along the direction of B-B.

[0038] The purposes, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings.

[0039] Explanation of reference signs:

[0040] 110, emergency pool; 111, overflow hole; 120, deicing salt water pool; 121, purification and reuse pump pit; 122, filter plate; 130, water distribution pool; 131, water inlet pipe; 140, sand and oil separation pool; 141, water outlet pipe. DETAILED DESCRIPTION

[0041] It should be understood that the specific embodiments described herein merely exemplify the application and do not limit the application.

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0043] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0044] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the technical features indicated or implying the number of the technical features indicated. Therefore, the features with "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of those skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection claimed by the present application.

[0045] Please refer to the accompanying drawings Figures 1-4The application provides a design method of a bridge water treatment multifunctional pool, which comprises an emergency pool 110 and a deicing salt pool 120. The emergency pool 110 is used for storing toxic wastewater in an emergency when a dangerous goods transport vehicle is in an accident, and the deicing salt pool 120 is used for storing melting ice wastewater in ice and snow weather. Further, the design method further comprises a distribution pool 130 and a sand and oil separation pool 140. The distribution pool 130 is used for being communicated with a bridge deck, and the sand and oil separation pool 140 is used for sand and oil separation of bridge deck rainwater in normal rain weather. The distribution pool 130 is used as a water inlet point of the bridge deck, and water is classified and flowed into the pools through respective gates. The distribution pool 130 is communicated with the bridge deck through a water inlet pipe 131 for drainage. In daily life, only the gate of the sand and oil separation pool 140 is opened for purification and sedimentation and then drainage. Therefore, the sand and oil separation pool 140 is communicated with an external water source through a water outlet pipe 141 on the side, and the salt-containing wastewater temporarily stored in the deicing salt pool 120 is also pumped out through a pump body. The specific design scheme is as follows.

[0046] The method comprises the following steps:

[0047] S1, determining a dangerous goods transport vehicle tank load volume V1 passing through a single bridge section. It should be noted that when a dangerous goods transport vehicle accident occurs, other gates of the multifunctional pool are closed, and only the gate of the emergency pool 110 is opened. In this way, all bridge deck water flows into the distribution pool 130 and then flows into the emergency pool 110. In this working condition, in addition to the toxic wastewater of the dangerous goods transport vehicle itself, a lot of water generated in other situations may also appear, such as fire rescue water used for treating the accident, rainwater when the accident occurs in rainy weather, and the like. All the above-mentioned water is generated on the bridge deck, flows into the distribution well and then flows into the emergency pool 110. Therefore, when designing, various situations are comprehensively considered to ensure that the volume of the emergency pool 110 can meet the water load when all the situations occur. Therefore, firstly, S11, the dangerous goods transport vehicle tank load volume V1 passing through a single bridge section is determined. Preferably, considering that different bridge decks can pass through different types of dangerous goods transport vehicles, and different types of dangerous goods transport vehicles have different dangerous goods load volumes, the design needs to comprehensively consider the record information of the dangerous goods transport vehicles that can pass through. According to the Road Dangerous Goods Transport Management Regulations of the Ministry of Transport, S12, in a preferred embodiment of the application, the volume of the dangerous goods transport vehicle tank does not exceed 20 m 3, so one of the factors determining the design pool capacity of the emergency pool 110 is the dangerous chemical transport vehicle tank limited volume V1, which is not greater than 20m 3 , the maximum value is 20m 3 .

[0048] S2, calculate the fire rescue water volume V2 of a single bridge; it is worth noting that for the emergency fire rescue after the dangerous chemical transport vehicle accident, the fire rescue needs to dilute the leaked dangerous chemicals, or to extinguish, block, cool, or flush the bridge to avoid harmful effects caused by toxic waste remaining on the bridge. So the fire rescue water flows into the distribution pool 130 and then into the emergency pool 110, so the fire rescue water volume is also an essential design consideration. S21, the fire rescue water volume can refer to the "Building Design Fire Prevention Code" (GB50016-2014) (2018 edition), and can be compared with the tunnel fire requirements for dangerous vehicle traffic. So the fire water volume should not be less than 20L / s (this is the fire unit time water volume), and then the fire rescue water volume V2 is determined according to the fire time. In a preferred embodiment of the present application, the fire time can refer to the fire requirements of the third type of tunnel, which is not less than 2h (this is the average fire time), so the fire rescue water volume V 2设计 is calculated to be 144m 3 .

[0049] Further, since the emergency pool 110 is only a temporary storage of toxic waste water, it needs to wait for the arrival of the waste water transfer vehicle at the scene and timely transfer of toxic waste water, so if the accumulated water in the emergency pool 110 can be pumped out in time, the timely accumulation of water in the emergency pool 110 can be reduced, and even if the fire rescue is still in progress, the accumulated water in the emergency pool 110 can be pumped out simultaneously, reducing the upper limit of the water storage in the emergency pool 110. In a specific embodiment, S22, first investigate the distance between the bridge where the accident occurred and the nearby dangerous chemical waste liquid transfer station, to calculate the fire drainage volume into the emergency pool 110 before the start of the dangerous chemical toxic waste liquid transfer. The fire unit time water volume is the same as above, and can be compared with the tunnel fire requirements for dangerous vehicle traffic, which is 20L / s. For example, after the accident, if the rescue response can be responded within 1h, the waste liquid starts to be transported out, and the fire water volume can be calculated for 1h. So the fire drainage volume into the emergency pool 110 is 72m 3 , which means that the accumulated water in the emergency pool 110 can be pumped out to the transfer vehicle at the same time, and the fire rescue water volume in the next 1h can continue to flow into the emergency pool 110. The two sides work synchronously, so the fire rescue water volume V 2实际 can be valued at 72m 3, thereby better optimizing the volume ratio of the emergency pool 110 in design, more scientifically reducing the cost and price, and improving the economy; and if the rescue response is started to transport the waste liquid outside at least 2h after the accident, considering that the basic fire duration is 2h, the fire drainage capacity of the emergency pool 110 is still calculated according to 2h (the basic fire is completed within 2h, and no new fire rescue water is generated), at this time, the fire time is not valued according to the rescue response time; in summary, S23, the fire rescue water volume V2 = min(V 2设计 , V 2实际 ) can be determined, and the actual openable waste liquid transportation time determined at the design time and the average fire time are compared.

[0050] S3, calculate the rainfall V3 in the bridge catchment area; it should be pointed out that when the dangerous chemical transportation vehicle accident occurs in the rain, rainwater will also flow into the distribution pool 130 and the emergency pool 110 along with the toxic waste water and the fire rescue water, so the rainfall V3 in the bridge catchment area is also one of the factors that need to be considered, and the rainfall in the single bridge catchment area can be further obtained according to the formula ; wherein F is the single bridge deck catchment area (hectare), H is the rainfall (mm) corresponding to the design annual runoff control rate, the rainfall can refer to the concept of annual runoff total control rate of sponge city, and it is recommended to calculate the rainfall corresponding to the regional annual runoff control rate of 70% (which can be obtained according to the local sponge city special planning), that is, the emergency pool 110 can meet the safe storage demand of the waste liquid leaked in the dangerous chemical vehicle traffic accident under the rainfall intensity of 70% in the whole year, is the bridge runoff coefficient, which is usually taken as 1.

[0051] S4, determine the design pool capacity V 应急 of the emergency pool 110; wherein the overflow hole 111 is arranged on the side wall connecting the emergency pool 110 and the deicing salt water pool 120, the overflow hole 111 is used for overflowing the additional rainfall in the rain day dangerous chemical transportation vehicle accident to the deicing salt water pool for temporary storage, V 应急 = V1+V2; it can be understood that after the determination of the several main factors of the pool capacity of the emergency pool 110, the design pool capacity of the emergency pool 110 is usually composed of V1+V2+V3 (when the dangerous chemical vehicle accident occurs in the rain), and more preferably, the overflow hole 111 is arranged between the other multifunctional water pool (deicing salt water pool) and the emergency pool 110, and since the deicing salt water pool is not normally opened to store the toxic deicing waste water in the rain, the amount of rain mixed in the accident waste water can flow into the deicing salt water pool 120 through the overflow hole 111 of the emergency pool 110 for temporary storage, and the deicing salt water pool 120 serves as an auxiliary storage pool, so the design pool capacity of the emergency pool 110 does not need to consider the volume required by the rainfall in design, thereby obtaining V 应急= V1+V2, which is the optimal volume size after design, which meets the temporary water storage requirements and is more economical and smaller in size after comprehensive consideration. It is worth mentioning that each factor is based on the average, critical value and theoretical value during design. In actual design or construction, a slightly larger value than the determined design pool capacity value (for example, 2m 3 ~3m 3 The specific value can be set by the person skilled in the art according to actual needs) is reserved, thereby reserving a certain excess space for other emergency situations.

[0052] S5, calculate the bridge ice melting water V4; It should be noted that when no hazardous chemical transport vehicle accident occurs, and ice melting is performed in snowy weather, salt-containing ice melting water is used to melt ice on the bridge to avoid vehicle skidding, so salt-containing ice melting wastewater is generated. At this time, only the gate of the ice melting salt water pool 120 is opened (the other gates are closed) so that the salt-containing ice melting wastewater flows into the water distribution pool 130 and then flows into the ice melting salt water pool 120. It is worth noting that according to the analysis of climate statistical data in various parts of China, rainfall mostly occurs in spring and autumn, and the proportion of rainfall in winter accounts for a small proportion of the whole year (for example, the winter precipitation in northern China accounts for only 5%~15% of the whole year). Rainfall is less, so snow melting and rainfall occur at the same time under the following conditions: snow accumulation in the early stage (temperature ≤0℃ and snow / rain accumulation), temperature rising above 0℃+rainfall in the later stage (accelerating snow melting), and the probability of meeting these two conditions is low. According to the research of Yang Yuting team of Tsinghua University, the probability of simultaneous occurrence of snow and rain in most areas is less than 5%, so in most cases, snow and rain will not occur at the same time. Bridge ice melting water mainly comes from artificial salt snow melting or natural melting after temperature rising, rather than directly caused by rainfall. Even if it happens to rain, due to low evaporation in winter and ice and snow coverage, rainwater will be absorbed or frozen by snow first, and will not immediately form a large amount of surface runoff.

[0053] According to the corresponding provisions of Article 5.10.1 of the “Outdoor Drainage Design Standard” (GB 50014-2021), “5.10.1 The three-dimensional intersection road is divided into elevated road and underpass interchange road. Its main task of drainage is to solve the ground runoff caused by rainfall and the exclusion of underground water affecting the function of the road. Generally, the influence of snowfall is not considered. For individual areas with large snowfall, snow melting flow check should be carried out.” The specification clearly states that snow (ice) water and rainwater do not reach the peak value at the same time, so there is no need to calculate the total water quantity (rainwater + ice melting water) by superposition, which avoids overdesign, and therefore the volume of the ice melting salt water pool 120 only considers the bridge ice melting water quantity.

[0054] In detail, in a preferred embodiment of this application, the emergency pool 110 is connected to the drainage of the two bridge decks on both sides to cope with the drainage of the two bridge decks under working conditions. Specifically, two distribution pools 130 are set on both sides to connect the bridge decks of the two bridges respectively. It is worth noting that only one accident is considered for the same bridge at the same time. Therefore, the emergency pool 110 is designed based on the values ​​of a single bridge (e.g., the capacity limit of the hazardous chemical transport vehicle tank of a single bridge, the water volume for fire rescue of a single bridge). However, in rainy or snowy weather, both bridges will generate rainwater or de-icing water at the same time. Therefore, when calculating the rainfall and de-icing water volume, both bridges must be considered at the same time. Hence, in S51, the formula can be used. Obtain the volume of water used for ice melting on the bridge deck, V4; where F' is the area of ​​the double-span bridge deck, and h is the snow thickness under design standards. This is the bridge deck runoff coefficient, which is usually taken as 1.

[0055] S6, Determine the design tank volume V of the de-icing brine tank 120. 除冰 Among them, V 除冰 =max(V3, V4); It should be noted that in the event of an accident involving a hazardous chemical transport vehicle during rainy weather, the de-icing brine tank 120, through the overflow hole 111, is used to temporarily store toxic wastewater mixed with rainwater in the emergency tank 110, that is, mainly to assist in the storage of V 应急 In addition to V1+V2, V3 is also present, thus V3 determines the capacity of the de-icing brine tank 120. During normal snowy weather, the de-icing brine tank 120 is used to store saline de-icing wastewater. Therefore, the bridge deck de-icing water volume V4 is also a factor to consider for the de-icing brine tank 120. Since the probability of rain and snow occurring simultaneously in most areas is extremely low, to ensure that both can meet the load-bearing requirements, the design capacity V of the de-icing brine tank 120 is... 除冰 Take the maximum of the two.

[0056] Furthermore, the bottom edge height h of the overflow hole 111 底 =(V1+V2) / S 应急 Among them, S 应急 The area of ​​emergency pool 110.

[0057] It should be noted that the design capacity V of the emergency pool 110 应急 After the design is completed, the height of the overflow hole 111 needs to be determined to ensure that rainwater seeping in during rainy weather can flow into the de-icing brine tank 120 through the overflow hole 111. Therefore, the area of ​​the emergency tank 110 needs to be determined first. The area of ​​the emergency tank 110 can be actually set by those skilled in the art based on the underground space near the bridge. Finally, the area is determined according to (V1+V2) / S 应急 The bottom height h of the overflow hole 111 is obtained. 底Similarly, the area and height of each pool can be set according to the underground space near the bridge.

[0058] Further, one corner end of the deicing salt water pool 120 is recessed to form a purification and recycling pump pit 121, and a filter plate 122 is arranged outside the enclosure of the purification and recycling pump pit 121. The filter plate 122 is in a bent shape and has filter holes.

[0059] It is worth mentioning that the filter plate 122 is used to purify the salt-containing ice-melting wastewater stored in the deicing salt water pool 120. The purified wastewater can be recycled and used, and the pollution of the deicing salt to the surrounding water and soil can be reduced. The filter plate 122 has filter holes for water flow, and the inside is provided with filter materials such as activated carbon. Therefore, one corner end of the deicing salt water pool 120 is recessed to form a purification and recycling pump pit 121 for collecting the deicing salt water after filtration and purification, and then the deicing salt water is pumped out to a transfer tank for recycling and used for ice melting again. In order to ensure the filtering effect, the filter plate 122 is arranged in a bent shape and arranged outside the purification and recycling pump pit 121, so that the salt-containing ice-melting wastewater can be ensured to flow into the purification and recycling pump pit 121 after filtration. It is worth mentioning that the filter plate 122 can be pre-assembled, which is convenient for installation and processing and improves the efficiency.

[0060] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which is based on the content of the specification and drawings of the present application, is also included in the patent protection scope of the present application.

Claims

1. A method of designing a bridge water treatment multi-functional pool, characterized by, The method comprises the steps of: S1, determining the tank load volume V1 of the hazardous chemical transport vehicle passing through a single bridge section; S2, calculating the water volume V2 for fire rescue of a single bridge; S3, calculating the rainfall V3 in the bridge catchment area; S4, determining the design pool volume V of the emergency pool 应急 ; wherein a side wall connecting the emergency pool and the deicing salt water pool is provided with an overflow hole, the overflow hole is used to overflow the extra rainfall of the hazardous chemical transportation vehicle accident in the rain to temporarily store in the deicing salt water pool, V 应急 = V1+V2; S5, calculating the ice-melting water volume V4 on the bridge deck; S6, determining a design tank volume V of the deicing brine tank 除冰 ; wherein V 除冰 = max(V3, V4).

2. The method of designing a bridge water treatment multi-functional pool according to claim 1, characterized in that, The step S1 specifically comprises the steps of: S11, determining the regional hazardous chemical transport vehicle record information; S12, obtaining the tank load volume V1 of the hazardous chemical transport vehicle according to the maximum value of each of the hazardous chemical transport vehicle record information.

3. The method of designing a bridge water treatment multi-functional cistern according to claim 2, characterized in that, The step S2 specifically comprises the steps of: S21, according to the regional hazardous vehicle fire-fighting requirements to obtain the fire unit time water, fire-fighting average time, to determine the fire rescue design water volume V 2设计 ; S22, obtain the distance from the emergency pool to the hazardous waste liquid transfer station to determine the waste liquid transfer time, and calculate the actual water consumption V of the fire department according to the fire department time and water volume 2实际 ; S23, determine the fire rescue water volume V2 = min(V 2设计 , V 2实际 ).

4. The method of designing a bridge water treatment multi-functional pool according to claim 1, wherein, The step S3 specifically comprises the steps of: S31, according to the formula Obtaining the rainfall in the bridge catchment area; Wherein, F is the single deck surface area, H is the corresponding rainfall under the design annual runoff control rate, is the deck runoff coefficient.

5. The method of designing a bridge water treatment multi-functional cistern according to claim 4, characterized in that, The height h of the bottom edge of the overflow hole 底 = (V1+V2) / S 应急 ; where S 应急 is the area of the emergency basin.

6. The method of designing a bridge water treatment multi-functional cistern according to claim 2, wherein, The two sides of the emergency pool are respectively used for connecting the drainage of the bridge decks of two bridges.

7. The method of designing a bridge water treatment multi-functional cistern according to claim 6, characterized in that, The step S5 specifically comprises the steps of: S51, according to the formula Wherein, F' is the area of the bridge decks of the two bridges, and h is the snow thickness under the design standard.

8. The method of designing a bridge water treatment multi-functional cistern according to claim 6, characterized in that, One corner end of the deicing salt water pool is recessed to form a purification and recycling pump pit, a filter plate is arranged outside the outer side of the purification and recycling pump pit, the filter plate is in a bent shape, and the filter plate itself has filter holes.

9. The method of designing a bridge water treatment multi-functional cistern according to claim 3, characterized in that, The average fire-fighting time is greater than or equal to 2 hours.

10. The design method of a bridge water treatment multifunctional pool according to any one of claims 1-9, applied to a bridge water treatment multifunctional pool, characterized in that, The bridge water treatment multifunctional pool further comprises a water distribution pool and a sand and oil separation pool, the water distribution pool is used for communicating with the bridge deck, and the water distribution pool, the sand and oil separation pool, the emergency pool and the deicing salt water pool are respectively and closably communicated.

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