CN107542127B - Heat preservation method for underground concrete reservoir - Google Patents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A30/24—Structural elements or technologies for improving thermal insulation
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Abstract
The invention belongs to the field of buildings and water storage; in particular to a heat preservation method of an underground concrete reservoir. The invention provides a method for judging whether an underground concrete reservoir in a region needs heat preservation measures or not by an algorithm, selecting a heat preservation material and designing a specific heat preservation structure according to a calculation result, and performing heat preservation treatment on the top and the wall of the underground reinforced concrete reservoir by using the heat preservation material. The method can avoid the problem that the cost of the water tank is higher due to the excessive burial depth of the water tank in hot summer and cold winter areas; the problem that the buried reservoir freezes in winter without deepening the buried depth in cold and severe cold areas with the frozen soil depth of more than 1000mm can also be solved.
Description
Technical Field
The invention belongs to the field of buildings and water storage; in particular to a heat preservation method of an underground concrete reservoir.
Background
The national standard data has the defects that in some areas, the underground concrete water storage tank needs to be subjected to heat preservation measures to prevent water in the water storage tank from freezing, so that inconvenience is brought to resident life or industrial production, in other areas, such as Guangdong and Taiwan areas, water in the underground concrete water storage tank cannot be frozen due to factors such as geographical positions and climates, so that waste of production data is caused, in other cold areas, such as Qinghai, Gansu, Xinjiang, inner Mongolia, Xizang areas, the maximum frozen soil depth is usually far larger than 1m, so that the underground soil covering thickness of 500 ~ mm cannot completely meet the requirement of the underground cold water storage tank, in other cold areas, the maximum frozen soil depth of the underground concrete water storage tank is greatly increased, the underground concrete water storage tank and the like, the requirement of the underground concrete water storage tank can not be subjected to freezing prevention, the requirement of the underground concrete water storage tank can be greatly increased, the requirement of the underground concrete water storage tank can be used as a heat preservation top plate of the underground concrete water storage tank, and the heat preservation tank can be used as a heat preservation material, and the heat preservation effect of the underground concrete water storage tank can be increased when the underground concrete water storage tank is increased, and the underground water storage tank is increased, and the top plate of the underground concrete water storage tank is increased, so that the requirement of the underground concrete water preservation and the underground concrete water preservation of the underground concrete water preservation tank can be increased, the underground concrete water preservation effect can be increased, and the heat preservation of the heat preservation tank can be increased, and the heat preservation of the underground concrete storage tank can be avoided, and the.
The invention content is as follows:
the invention provides a heat preservation method of an underground concrete reservoir, which solves the problems of production data waste or unsatisfactory heat preservation effect in the prior art:
the invention is realized by the following technical scheme:
a heat preservation method of an underground concrete reservoir is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: judging whether the underground concrete reservoir in the area needs heat preservation measures or not, wherein the algorithm is as follows:
step A, calculating the maximum allowable heat loss amount of water in the pool:whereinQ- - - -heat loss, W; m- -total mass in the tank, kg; c- -specific heat of the object,；-the final temperature of the object, c;-initial temperature of the object, c; v-the volume of water in the pit, m; rho is the specific gravity of water, kg/L;
step B, calculating the average hour maximum heat loss in the water storage time:；-average hourly maximum heat loss, kJ/h; q- - -heat loss, kJ; t- - -time, h;
step C, calculating the maximum allowable heat transfer coefficient: average maximum hourly heat losskJ/h; the heat load q, kW can be obtained; wherein 1kW =3.6 kJ/h; then byCalculating the heat transfer coefficient:(ii) a q- -thermal load, kW; k- -the heat transfer coefficient,；F---the surface area,；-water temperature in the tank, c;-outdoor air temperature;
step D, calculating the actual heat transfer coefficient of the pool when the temperature is not kept:
wherein:
-the actual heat transfer coefficient,；-the average thermal resistance is,；
r- -heat resistance of the single-layer material,；-thickness of the single-layer envelope, m;
-the thermal conductivity of the building envelope,；
step E, comparing the actual heat transfer coefficient K' calculated in the step D with the maximum allowable heat transfer coefficient K calculated in the step three; if the actual heat transfer coefficientIf the heat transfer coefficient is larger than the maximum allowable heat transfer coefficient K, the water in the water tank can be frozen; otherwise, the ice cannot be frozen;
step two: and (4) selecting a heat insulation structure and a heat insulation material according to the calculation result of the step one.
Further, when K' is larger than the maximum allowable heat transfer coefficient K, the underground concrete reservoir in the area needs to be subjected to heat preservation measures, and the following scheme is provided for preserving the heat of the pool body:
A. and (3) top of the tank: laying a backfill material on the tank top structural layer, leveling by using cement mortar with the thickness of 20mm after slope finding, laying a heat insulation material, and finally backfilling with plain soil;
B. filling the periphery of the pool body with a backfill material, covering the upper end of the pool body which is level with the top structural layer of the pool with pebble-poured M2.5 mixed mortar with the thickness of 150mm and the height of 5 ~ 32mm, leveling the pool body with cement mortar with the thickness of 20mm, paving a heat insulation material, and finally backfilling with plain soil.
Further, the backfill material is slag 200 ~ 430mm thick.
Furthermore, if the maximum allowable heat transfer coefficient K is less than the actual heat transfer coefficient K' < 2K, the heat-insulating material is made of extruded polystyrene boards with the thickness of 0 ~ 60mm or rock wool boards with the thickness of 0 ~ 80mm, and if the maximum allowable heat transfer coefficient K is less than 2K, the heat-insulating material is made of extruded polystyrene boards with the thickness of 60 ~ 120mm or rock wool boards with the thickness of 80 ~ 160 mm.
Further, in step a, the backfill material layer slopes from the center of the pool plane to the periphery with a slope of i = 2%.
Furthermore, ∅ 6@200 steel wire meshes are arranged on the fine stone concrete protective layer, 40mm expansion joints are arranged every 6x6m, and the fine stone concrete protective layer is filled with asphalt cement.
Furthermore, the outer side of the water inlet and outlet pipe is wrapped by an extruded polystyrene board with the thickness of 120 mm.
The invention has the beneficial effects that:
the invention provides a method for judging whether an underground concrete reservoir in a region needs heat preservation measures or not by an algorithm, selecting a heat preservation material according to a calculation result, designing a specific heat preservation structure and carrying out heat preservation treatment on the top and the wall of the underground reinforced concrete reservoir by using the heat preservation material. The method can avoid the problem that the cost of the water tank is higher due to the excessive burial depth of the water tank in hot summer and cold winter areas; the problem that the buried reservoir freezes in winter without deepening the buried depth in cold and severe cold areas with the frozen soil depth of more than 1000mm can also be solved.
The method comprises the steps of firstly, judging whether water in a pond can be frozen in an area where an underground concrete water storage pond is located within a normal buried depth range, normally, judging whether the water storage time in the pond is different according to the reliability of project water supply and the uneven coefficient of water inlet and outlet in the pond, wherein the factors which have larger influence in thermal calculation mainly comprise the local air temperature and the initial temperature of the water in the pond, judging whether the water can be frozen when the water is frozen by calculating the relation between the actual heat transfer coefficient K 'and the maximum allowable heat transfer coefficient K within the normal water storage time of the pond, and properly selecting different covering soil thicknesses within the normal covering soil thickness range of 500 ~ 1000mm according to the difference value between the actual heat transfer coefficient K' and the maximum allowable heat transfer coefficient K so as to avoid waste caused by excessive investment.
Secondly, when the calculation result K 'is more than or equal to K, the water in the pool is frozen in the effective water storage time, the underground concrete reservoir transfers heat to the outside through the pool body of the concrete and soil, the normal engineering method is to increase the thickness of the soil covering of the underground concrete reservoir, and the increase of the wall thickness and the arrangement of ribs is brought with the increase of the wall thickness and the arrangement of ribs, so that the cost is increased, the invention adopts two important measures, namely 1, the waste slag is effectively recycled by adopting the slag with low heat conductivity coefficient to replace the soil with high heat conductivity coefficient to backfill the periphery and the top of the pool, and the heat conductivity resistance of the environment around the underground concrete reservoir is also improved, 2, the heat insulation material with good heat insulation performance and high engineering practicability is adopted to carry out the heat insulation of the pool body, and if the K is less than 2K', the polystyrene board 3560 mm or 3680 mm is adopted to select the polystyrene board ~ mm or 3680 mm, and the polystyrene board ~ mm is adopted to select the heat insulation material with the K6326 mm.
The water reservoirs are used for storing production, fire-fighting and domestic water with certain volumes in industrial projects, municipal works and civil buildings, the underground water reservoirs have the advantage of saving project land, and most projects select underground concrete water reservoirs; the invention carries out thermal calculation around the pool body aiming at the underground concrete reservoir to determine whether the water energy in the pool is frozen in the normal water storage time so as to decide whether to take heat preservation measures or not; and then, making heat insulation measures according to actual needs, and selecting a heat insulation material. The invention widens the use area of the underground concrete reservoir in the normal earthing range, extends from the hot-in-summer and cold-in-winter area to the cold and severe cold areas, and has remarkable social benefit for the development of national economy; the empirical basis of the value of the normal soil covering range is also provided, the investment waste caused by excessive burial depth is avoided, and the economic benefit is obvious; meanwhile, the method uses the slag with low heat conductivity coefficient to replace sandy soil with higher heat conductivity coefficient to backfill the periphery and the top of the pool body, so that the waste slag is effectively recycled, and certain environmental benefits are achieved.
Drawings
FIG. 1 is a schematic diagram of a heat transfer process for a multi-layer material;
FIG. 2 is a schematic view of a thermal insulation structure of a water pool.
In the figure: 1-pool body; 2, the top of the tank; and 3, slag.
Detailed Description
A heat preservation method for an underground concrete reservoir is provided with an algorithm for judging whether the underground concrete reservoir in a region needs heat preservation measures or not, selecting a heat preservation material according to a calculation result and designing a specific heat preservation structure, wherein the algorithm is as follows:
step A, the water in the pool has a certain temperature initially (the temperature is generally known), that is, the water stored in the pool contains a certain heat energy, and when the external temperature is lower than the temperature of the water in the pool, the heat energy of the water in the pool can be dissipated to the outside. Usually, the temperature of the outside air fluctuates along with the change of seasons and day and night, which is an unstable heat transfer process, but in the actual engineering design, in order to simplify the calculation, the temperature inside and outside the pool and other parameters of the heat transfer process do not change along with the time in the calculation time, and the heat loss quantity of the pool is calculated according to the stable heat transfer process; the maximum allowable heat loss of the water in the tank is thus calculated: q = CM (t)2-t1) Where M = V ρ, Q- - -heat loss (W), M- - -total mass in the bath (kg), C- - -specific heat of the object (kJ/kg. DEG C), t- -2-final temperature of the object (. degree. C.), t1-initial temperature of the object (c); v- -interior water volume (m) for cultivation; rho- - -specific gravity of water (kg/L)
Step B, the water storage tanks in any type project need water quantity in a certain time period, the water storage time and the adjusting volume of the water tank are different according to the water supply reliability and the variation fluctuation size of the water inlet quantity and the water outlet quantity of the water storage tanks, generally the range is 8 ~ 48h, the time can be longer, the water supply reliability is good, the variation fluctuation of the water inlet quantity and the water outlet quantity can be small, otherwise, the large value is obtained, the hour heat loss quantity is gradually reduced along with the increase of the water storage time, in order to simplify the calculation, the maximum heat loss quantity is averaged in the water storage time, namely the average hour maximum heat loss quantity, Q is calculated, the average hour maximum heat loss quantity in the water storage time, theFlat plate= Q/T；QFlat plateAverage hourly maximum heat loss (kJ/h), Q-heat loss (W), T-time (h);
step C, the reinforced concrete reservoir which is not insulated by adopting the heat insulation material transfers heat to the outside mainly through a reservoir body (comprising a reservoir top plate, a reservoir bottom plate and a reservoir wall) and soil filled at the periphery of the reservoir body; the heat is transferred to the outside by adopting heat-insulating materials in the reservoir body (comprising a top plate, a bottom plate and a wall), the heat-insulating layer and the soil filled at the periphery of the reservoir body. When the average time is small due to water storageMaximum heat loss amount QFlat plate(kJ/h) when the heat load q (kW) is determined, 1kW =3.6kJ/h can be obtained; calculating the maximum allowable heat transfer coefficient: q = KF (tn-tw), K = q/F (tn-tw); q- -thermal load (kW); k- - -heat transfer coefficient (kW/. square meter. degree. C.); f- - -surface area (square meter); tn-water temperature in the tank (DEG C); tw — outdoor air temperature (deg.C);
step D, whether the water pool without heat insulation or the water pool with heat insulation material is adopted, the enclosure structure forms a homogeneous multilayer material, and the heat transfer process is as shown in the schematic diagram of the heat transfer process of the multilayer material in figure 1: under stable heat transfer conditions, the temperature distribution within each material layer is linear, forming a continuous fold line in the multilayer flat wall. The degree of temperature drop within the material layer is directly proportional to the thermal resistance of each layer, with the greater the thermal resistance of the material layer, the greater the temperature drop within that layer. It is separated into sections along the interface of different materials in the material layer parallel to the direction of heat flow. 1, 2, 3 and the like in the figure are calculated according to the above formula; and finally determining the weighted average thermal resistance according to the following formula:
wherein:
-the actual heat transfer coefficient,；-the average thermal resistance is,；
r- -heat resistance of the single-layer material,；-thickness of the single-layer envelope, m;
-the thermal conductivity of the building envelope,；
step E, comparing the actual heat transfer coefficient K' calculated in the step D with the maximum allowable heat transfer coefficient K calculated in the step three; if the actual heat transfer coefficientIf the heat transfer coefficient is larger than the maximum allowable heat transfer coefficient K, the water in the water tank can be frozen; otherwise, the ice cannot be frozen;
step E, comparing the actual heat transfer coefficient K' calculated in the step D with the maximum allowable heat transfer coefficient K calculated in the step three; if the actual heat transfer coefficient K' is greater than the maximum allowable heat transfer coefficient K, the water in the water pool can be frozen; otherwise, no ice will be formed.
Step two: and (4) selecting a heat insulation structure and a heat insulation material according to the calculation result of the step one.
Further, referring to fig. 2, when K' is greater than the maximum allowable heat transfer coefficient K, the underground concrete reservoir in the area needs to be insulated, and the following scheme is provided for insulating the tank body 1:
A. and 2, the top of the tank: laying a backfill material on the tank top structural layer, leveling by using cement mortar with the thickness of 20mm after slope finding, laying a heat insulation material, and finally backfilling with plain soil;
B. filling the periphery of the pool body 1 with a backfill material, covering the upper end of the pool body which is level with the top structural layer of the pool with pebble-poured M2.5 mixed mortar with the thickness of 150mm and the height of 5 ~ 32mm, leveling the pool body with cement mortar with the thickness of 20mm, paving a heat insulation material, and finally backfilling with plain soil.
Further, the backfill material is slag 3 with the thickness of 200 ~ 430mm, and the slag with low heat conductivity coefficient is adopted to replace soil with higher heat conductivity coefficient to backfill the periphery and the top of the pool body, so that the waste slag is effectively recycled, and the heat resistance of the environment around the underground concrete reservoir is also improved.
Furthermore, if the maximum allowable heat transfer coefficient K is less than the actual heat transfer coefficient K' < 2K, the heat-insulating material is made of extruded polystyrene boards with the thickness of 0 ~ 60mm or rock wool boards with the thickness of 0 ~ 80mm, and if the maximum allowable heat transfer coefficient K is less than 2K, the heat-insulating material is made of extruded polystyrene boards with the thickness of 60 ~ 120mm or rock wool boards with the thickness of 80 ~ 160 mm.
Further, in the step A, the backfill material layer begins to find a slope from the center of the plane of the water pool to the periphery, the slope is i =2%, waste slag is effectively recycled, and heat resistance of the environment around the underground concrete water storage pool is improved.
Furthermore, ∅ 6@200 steel wire meshes are arranged on the fine stone concrete protective layer, 40mm expansion joints are arranged every 6x6m, and the fine stone concrete protective layer is filled with asphalt cement mortar; the steel wire mesh can effectively stabilize the fine stone concrete protective layer.
Furthermore, the outer side of the water inlet and outlet pipe is wrapped by an extruded polystyrene board with the thickness of 120mm, so that the water pipe is insulated, and the water in the water pipe is prevented from freezing.
Example (b):
example 1
Dividing the climate of Chengdu into regions of hot summer, cold winter, and cultivating at-5.9 deg.C for the extreme of the year, wherein the water temperature in the pond is usually 5 deg.C, and the effective volume of the water reservoir is 1000m (size is 15.9m × 15.9m × 4 m); the pool wall thickness is 250mm, and the water storage time is 48 h; under the condition of not performing any heat preservation, the periphery and the top of the pool in the pool can radiate heat to the surrounding environment;
(1) calculating the maximum allowable heat lossWherein t is2=5℃，t1=0℃，C=4.187kJ /kg·℃，M=1000m³×1000×1.0kg/L=1.0×106kg, maximum allowable heat loss=4.187kJ /kg·℃×1.0×106kg×（5-0）℃=2.1×107kJ
(2) Calculating the average hour maximum heat loss amount in the water storage time:=2.1×107kJ/48h=4.35×105kJ/h；
(3) calculating the maximum allowable heat transfer coefficient:wherein Q = QFlat plate/3.6=1.2×105And kW, 1000m of water basin for carrying out fruit and vegetable harvest, wherein the surface area F =15.9m × 15.9m × 4+15.9m × 4m × 4=760 square meters formed on the top and the periphery of the pool. tn =5 ℃, tw = -5.9 ℃, calculated as: k =14.5 kW/square meter per deg.C.
(4) Calculating the actual heat transfer coefficient of the pool when the temperature is not kept:
Looking up a table: heat conductivity coefficient of reinforced concrete=1.63 kW/m · DEG C, thermal conductivity of the surrounding soil3.5kW /m·℃
Heat transfer resistance of reinforced concrete pool wall and pool top=0.25mm/1.63kW /m·℃=0.153㎡·℃/kW
Thermal resistance of surrounding soil R2=σ2/λ2=0.6mm/3.5kW /m·℃=0.171㎡·℃/kW
Substituting the weighted average thermal resistance equation:
obtaining a weighted average thermal resistance:
by the formulaThe practical heat transfer coefficient K' =1/0.161 square meter/kW =6.2 kW/square meter/DEG C
Because the situation in practical engineering is complex, the calculation result needs to be multiplied by a safety coefficient of 1.3, and then K' =1.3 multiplied by 6.2 kW/square meter ℃/= 8.1 kW/square meter ℃/
And (3) calculating to obtain: k' =8.1 kW/square meter ℃ < K =14.5 kW/square meter ℃
The underground concrete reservoir can not be frozen, does not need heat preservation treatment, and can be covered with soil within the range of 500 ~ 1000mm of soil covering.
Example 2
Carrying out top-grade cultivation in the area A of the Lanzhou city of Gansu province at-21.7 ℃ at the lowest annual extreme temperature, generally carrying out water temperature in the pond at 5 ℃, and carrying out 1000m of cultivation in an effective volume of a water storage pond (the size is 15.9m multiplied by 4 m); the pool wall thickness is 250mm, and the water storage time is 48 h;
the calculation process is the same as that of example 1, and can be obtained: the actual heat transfer coefficient K' (8.1 kW/square meter ℃) is more than the maximum allowable heat transfer coefficient K (5.92 kW/square meter ℃);
in the selection of the heat insulation material, the range of K < K' < 2K is met, and the heat insulation material is an extruded polystyrene board with the thickness of 0 ~ 60mm or a rock wool board with the thickness of 0 ~ 80 mm;
example 3
Inner Mongolia, Xilinghaote City, is located in severe cold region B, the lowest annual temperature is-38 deg.C, the water temperature in the pond is usually 5 deg.C, and the effective volume of the water reservoir is 1000m for carrying out the thin-wall cultivation (the size is 15.9m × 15.9m × 4 m); the pool wall thickness is 250mm, and the water storage time is 48 h;
the calculation process is the same as that of example 1, and can be obtained: the actual heat transfer coefficient K' (8.1 kW/square meter ℃) is more than the maximum allowable heat transfer coefficient K (3.68 kW/square meter ℃);
the selection of the heat insulation material meets the range that 2K is more than K' and less than 3K, and the heat insulation material is 60 ~ 120mm thick extruded polystyrene board or 80 ~ 160mm rock wool board.
Claims (7)
1. A heat preservation method of an underground concrete reservoir is characterized by comprising the following steps: the method comprises the following steps: the method comprises the following steps: judging whether the underground concrete reservoir in the area needs heat preservation measures or not, wherein the algorithm is as follows:
step A, calculating the maximum allowable heat loss amount of water in the pool:whereinQ- - - -heat loss, W; m- -total mass in the tank, kg; c- -specific heat of the object,；-the final temperature of the object, c; t is t1-initial temperature of the object, c; v-the volume of water in the pit, m; rho is the specific gravity of water, kg/L;
step B, calculating the average hour maximum heat loss in the water storage time:；-average hourly maximum heat loss, kJ/h; q- - -heat loss, kJ; t- - -time, h;
step C, calculating the maximum allowable heat transfer coefficient: average maximum hourly heat losskJ/h; the heat load q, kW can be obtained; wherein 1kW =3.6 kJ/h; then byCalculating the heat transfer coefficient:(ii) a q- -thermal load, kW; k- -the heat transfer coefficient,(ii) a F- -surface area of the substrate,；-water temperature in the tank, c;-outdoor air temperature;
step D, calculating the actual heat transfer coefficient of the pool when the temperature is not kept:
wherein:；
-the actual heat transfer coefficient,； -the average thermal resistance is,；
r- -heat resistance of the single-layer material,；-thickness of the single-layer envelope, m;
lambda is the heat conductivity coefficient of the building envelope,；
step E, comparing the actual heat transfer coefficient K' calculated in the step D with the maximum allowable heat transfer coefficient K calculated in the step C; if the actual heat transfer coefficientIf the heat transfer coefficient is larger than the maximum allowable heat transfer coefficient K, the water in the water tank can be frozen; otherwise, the ice cannot be frozen;
step two: and (4) selecting a heat insulation structure and a heat insulation material according to the calculation result of the step one.
2. A method of insulating an underground concrete reservoir according to claim 1, characterised in that: when the actual heat transfer coefficient K' is larger than the maximum allowable heat transfer coefficient K, the following scheme is provided for preserving the heat of the pool body:
step 1, tank top: laying a backfill material on the tank top structural layer, leveling by using cement mortar with the thickness of 20mm after slope finding, laying a heat insulation material, and finally backfilling with plain soil;
step 2, filling the periphery of the pool body with a backfill material, covering the upper end of the pool body which is level with the top structural layer of the pool with pebble-poured M2.5 mixed mortar with the thickness of 150mm and the height of 5 ~ 32mm, leveling the cover with cement mortar with the thickness of 20mm, paving a heat insulation material, and finally backfilling with plain soil.
3. The method of claim 2, wherein the backfill material is a slag 200 ~ 430mm thick.
4. A method of insulating an underground concrete reservoir according to claim 2, characterised in that: in step 1, the backfill material layer is sloped from the center of the pool plane to the periphery, and the slope is i = 2%.
5. A method of insulating an underground concrete reservoir according to claim 2, characterised in that: an ∅ 6@200 steel wire mesh is arranged on the fine stone concrete protective layer, 40mm expansion joints are arranged every 6x6m, and the fine stone concrete protective layer is filled with asphalt cement.
6. A method of insulating an underground concrete reservoir according to claim 2, characterised in that: the outer side of the water inlet and outlet pipe is wrapped by an extruded polystyrene board with the thickness of 120 mm.
7. A method of insulating an underground concrete reservoir according to claim 1, characterised in that: if the maximum allowable heat transfer coefficient K is less than the actual heat transfer coefficientLess than 2K, the heat-insulating material is 0 ~ 60mm thick extruded polystyrene board or 0 ~ 80mm rock wool board, and if 2K is less than actual heat transfer coefficientLess than 3K, the heat-insulating material is 60 ~ 120mm thick extruded polystyrene board or 80 ~ 160mm rock wool board.
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| JP2013249634A (en) * | 2012-05-31 | 2013-12-12 | Panahome Corp | Building structure |
| CN105239677A (en) * | 2015-10-27 | 2016-01-13 | 中国水利水电科学研究院 | Concrete overwintering heat insulation method in cold regions |
| CN205677050U (en) * | 2016-06-14 | 2016-11-09 | 攀枝花学院 | A kind of view cistern |
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