CN113191039A - Water cooling and water temperature optimization control method and system for lining concrete - Google Patents
Water cooling and water temperature optimization control method and system for lining concrete Download PDFInfo
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- 238000001816 cooling Methods 0.000 title claims abstract description 127
- 238000000034 method Methods 0.000 title claims abstract description 44
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Abstract
The invention provides a water cooling and water temperature optimization control method and system for lining concrete, which can quickly and accurately calculate and obtain an optimization control water temperature value, and scientifically and reasonably realize temperature control and crack prevention by cooling lining concrete through water based on the optimization control water temperature value. The invention provides a lining concrete water-feeding cooling water temperature optimization control method, which is characterized by comprising the following steps: step 1, collecting data for temperature control of lining concrete; step 2, calculating the water cooling optimal control water temperature T of the lining concretewy＝10.68H+0.16C‑0.25HC‑0.53H2+ 3.95; step 3, optimally controlling the water temperature T according to water coolingwyAnd optimizing water cooling measures of the lining concrete.
Description
Technical Field
The invention belongs to the technical field of concrete temperature control and crack prevention, and particularly relates to a method and a system for optimally controlling water temperature of water for water feeding and cooling of lining concrete.
Background
Large-volume concrete such as a gravity dam and the like is embedded with a cooling water pipe for water cooling, and cooling water or low-temperature river water is introduced at the initial stage to reduce the highest temperature of the concrete; in the middle stage, river water can be introduced for cooling, and the temperature difference between the inside and the outside can be controlled. Since the concrete expands during the temperature rise phase, the aim is to reduce the maximum temperature of the concrete, the larger the reduction, the better, so that the initial water temperature is preferably reduced as much as possible under the allowable conditions. In the middle stage, the temperature drop stage is the stage in which the water temperature is too low and the temperature drop speed is too fast, which may cause early-stage low-strength concrete cracks and may also cause local cracks due to too large temperature gradient of the concrete around the pipe, so the water temperature and the temperature drop rate must be controlled accordingly.
According to the research on the influence of the simulated concrete pouring process on the first-stage water cooling temperature of the high-concrete arch dam on the concrete around the water pipe: for old concrete at the lower part (layer) of the water pipe, the temperature of the concrete is higher (20 ℃) before the water pipe is cooled by water, when the water pipe is cooled by the water, the concrete at the periphery of the water pipe is quickly close to the water temperature from the higher temperature, the closer to the water pipe, the faster the temperature drop speed is, a larger gradient of the temperature drop amplitude is formed at the periphery of the water pipe, and the lower the water temperature is, the larger the gradient of the temperature drop amplitude is; the newly poured concrete on the upper part of the water pipe is cooled by water while the concrete is poured, and the temperature of the concrete around the water pipe is kept close to the water temperature without increasing to a high temperature (initial warehousing temperature). Although the distance from the water pipe is different, the temperature and the temperature gradient of the parts are kept unchanged and do not change greatly. The shrinkage deformation is generated by temperature reduction, the deformation is not uniform due to non-uniform temperature reduction amplitude, and self-restraint is generated, so that the tensile stress is generated by old concrete at the lower part of the water pipe due to the non-uniform temperature reduction amplitude, and the tensile stress is not large due to the fact that newly poured concrete at the upper part of the water pipe does not have an obvious temperature reduction process. Therefore, the water temperature (namely the temperature difference with the internal concrete) of the water-through cooling water of the mass concrete such as the multi-layer pouring dam is controlled by not generating temperature cracks around the lower-layer old concrete pipe, and the allowable water temperature difference and the temperature drop speed are smaller.
The lining is a structure (figure 1) widely adopted in civil engineering, hydraulic tunnels and other relevant regulations have no provisions on the control of the water temperature and the temperature reduction rate of the water cooling of the lining concrete. In the engineering construction, the concrete gravity dam (or arch dam) design, hydraulic concrete construction and other standard regulations are only required to be adopted: the temperature difference between the dam concrete and the cooling water is not more than 20-25 ℃. However, the lining structure is generally small in thickness and is poured once, water cooling starts to be conducted when the concrete covers the cooling water pipe, an obvious temperature reduction process is not generated around the pipe, and the tensile stress is not large. Therefore, the temperature of the water for cooling the lining structure should be determined by obtaining the optimal temperature control anti-cracking effect (referred to as the optimal control water temperature for cooling the concrete of the lining structure). Moreover, the thickness of the lining structure is different, the strength of concrete is different, the water temperature can be controlled by water cooling optimization greatly, and the water temperature setting is set according to the standard temperature difference obviously and hardly meets the optimization control requirement. However, at present, a method for accurately calculating water feeding cooling optimized water temperature control according to the concrete condition of a thin-wall lining structure does not exist.
Disclosure of Invention
The invention is made to solve the above problems, and aims to provide a water cooling and water temperature optimization control method and system for lining concrete, which can calculate and obtain an optimization control water temperature value quickly and accurately, and perform water cooling on the lining concrete based on the optimization control water temperature value, thereby scientifically and reasonably realizing temperature control and crack prevention.
In order to achieve the purpose, the invention adopts the following scheme:
< method >
As shown in FIG. 2, the present invention provides a method for controlling the temperature of cooling water through concrete lining, which comprises the following steps:
Twy＝10.68H+0.16C-0.25HC-0.53H2+3.95 (equation 1)
In the formula: h is the thickness (m) of the lining concrete; c, designing age strength grade (MPa) for lining concrete 90 d;
step 3, optimally controlling the water temperature T according to water coolingwyAnd optimizing water cooling measures of the lining concrete.
Preferably, the lining concrete water-feeding cooling water temperature optimization control method provided by the invention can also have the following characteristics:in step 3, the optimized water cooling measure is to adopt the temperature TwyThe cooling water cools the lining concrete.
Preferably, the lining concrete water-feeding cooling water temperature optimization control method provided by the invention can also have the following characteristics: adopting a control processing device to execute the step 2, and determining the water cooling optimal control water temperature Twy。
Preferably, the lining concrete water-feeding cooling water temperature optimization control method provided by the invention can also have the following characteristics: and (3) executing the step (1) by adopting a control processing device, and enabling an operator to input lining concrete temperature control data according to the prompt and store the lining concrete temperature control data.
Preferably, the lining concrete water-feeding cooling water temperature optimization control method provided by the invention can also have the following characteristics: the step 3 is also executed by adopting a control processing device, and the water temperature T is optimally controlled according to the water coolingwyAnd determining a water cooling measure, and controlling a water cooling device to carry out water cooling maintenance on the lining concrete.
< System >
Further, the present invention provides an optimization control system for water cooling and water temperature of lining concrete, which is characterized by comprising: an input display part for the operator to input the collected lining concrete temperature control data according to the prompt; a storage part for storing the input lining concrete temperature control data; a calculating part for calculating the water temperature T of the lining concrete through water cooling optimization control by adopting the following formula based on the data for the temperature control of the lining concretewy：Twy＝10.68H+0.16C-0.25HC-0.53H2+3.95, formula (la): h is the thickness of the lining concrete; c, designing age strength grade for lining concrete 90 d; a water cooling part for optimally controlling the water temperature T according to the water coolingwyPerforming water cooling measures; and a control part which is connected with the input display part, the storage part, the calculation part and the water cooling part in a communication way and controls the operation of the input display part, the storage part, the calculation part and the water cooling part.
Preferably, the lining concrete water-feeding cooling water temperature optimization control system provided by the invention can also have the following characteristics: the input display part also controls the optimal control water temperature T of the water cooling calculated by the calculation part according to the operation commandwyAnd displaying.
Preferably, the lining concrete water-feeding cooling water temperature optimization control system provided by the invention can also have the following characteristics: the input display unit also displays the measures of water cooling performed by the water cooling unit based on the operation command.
In addition, the step 2 is used for calculating the optimal control water temperature T for cooling the concrete of the lining structure by waterwyThe formula 1 is to take giant hydropower station flood discharging tunnel engineering such as Xiluodie, white Crane beach, Wudongde and the like as an example, a three-dimensional finite element method is adopted to carry out temperature and temperature stress simulation calculation on lining concrete with different thicknesses and different strength grades on an urban door opening type section under different water cooling water temperature conditions, the temperature control anti-cracking effect of the lining concrete in the whole process is analyzed in a finishing mode, the principle of maximizing the anti-cracking safety coefficient in the whole process is obtained, and the optimal water cooling water temperatures of the lining concrete with different thicknesses and different strength grades are obtained. For example, a 1.0m thickness sidewall C adopting a structure (FIG. 1)9030 strength concrete with different water temperatures T of 8-22 ℃ in the following table 1wSimulation calculation of water cooling condition is carried out to obtain crack resistance safety coefficient K of the whole lining concrete process, and two curing periods K with the minimum K value are arranged1And winter K2Then make K1、K2With the temperature T of the waterwSee fig. 3. Due to K1With TwIncrease, K2With TwThe point of intersection of the two curves is the water temperature T which can obtain the maximum safety coefficient of crack resistance in the whole processwy. The optimal water cooling temperature of the lining concrete with different thicknesses and different strength grades is shown in a table 2, and the data are analyzed and researched to obtain the optimal water temperature TwyEquation 1 is calculated. The regression values and their errors are also listed in table 2.
TABLE 11.0 m Lining C 9030 concrete water cooling characteristic values at different water temperatures
TABLE 2 optimal water cooling temperature for lining concrete of different thickness and different strength grade
Action and Effect of the invention
The lining concrete water-through cooling water temperature optimization control method and the system provided by the invention have the advantages that:
(1) the method can be applied to any lining concrete structure, the optimal control calculation of the water temperature of the cooling water can be carried out, and the cooling water temperature value can be quickly obtained.
(2) The method is scientific. And a water cooling optimal control water temperature calculation formula comprehensively reflects the influence of the lining structure and the concrete performance on the water cooling effect.
(3) Calculating the water cooling optimal control water temperature T of lining concrete according to the formula 1wyThe water temperature value with the maximum crack resistance safety coefficient can be obtained, and the water temperature T is controlled according to the optimizationwThe temperature control and crack prevention can obtain better effect, and the safety of the lining concrete structure is ensured.
(4) Furthermore, the water cooling and water temperature optimization control system for lining concrete provided by the invention can automatically calculate and obtain the water cooling and water temperature T for lining concrete according to the data for lining concrete water cooling and temperature controlwyAnd corresponding water cooling measures are executed, the whole process has no interference of human factors, the automation degree is high, the water cooling of the lining concrete can be quickly and effectively carried out at proper water temperature, and the temperature control and anti-cracking effects of the lining concrete are ensured.
Drawings
FIG. 1 is a sectional view of a tunnel type lining structure of a hydraulic tunnel (dimension unit: m in the figure);
FIG. 2 is a flow chart of the method for controlling the optimization of the water temperature of the concrete lining by introducing water;
FIG. 3 shows a graph C according to the present invention 9030 concrete curing period K with different thickness1And winter K2Water is introduced for cooling water temperature TwA relationship diagram of (1);
FIG. 4 shows a white crane beach hydropower station 1 according to the present invention#A section diagram of a lining structure of an upper flat section of the flood discharge tunnel;
FIG. 5 is a schematic structural diagram of an arrangement of water-cooling water pipes according to an embodiment of the present invention;
FIG. 6 is a 143 cell lined concrete temperature time course graph according to an embodiment of the present invention;
fig. 7 is a graph of 93 units of lined concrete temperature over time according to an embodiment of the present invention.
Detailed Description
The concrete embodiment of the method and the system for controlling the water temperature optimization of the lining concrete water-feeding cooling water according to the invention is explained in detail below by taking lining concrete at different parts of a flood discharge tunnel project of a hydropower station of the white crane beach as an example with reference to the attached drawings.
< temperature control data of lining concrete for flood discharge tunnel engineering of hydropower station in white crane beach >
The white crane beach hydropower station has an installed capacity of 16000MW, and is the 2 nd hydropower station (second to the three gorges) all over the world. The hub project consists of main buildings such as a barrage, a flood discharge and energy dissipation building, a water diversion and power generation system and the like. The flood discharge facility comprises 6 surface holes of a dam, 7 deep holes and 3 flood discharge tunnels on the left bank. 3 flood discharging holes are arranged on the left bank, a non-pressure flood discharging hole type is adopted, and the flood discharging holes are all composed of a water inlet (a gate chamber), a non-pressure slope relieving section, a dragon falling tail section and an outlet drift bucket, 1#、2#The falling tail of the flood discharge tunnel is reversely arc-connected with the flip bucket, 3#The tail end of the reverse arc is connected with a lower flat section with the gradient of 8% and then connected with an outlet flip bucket due to the limitation of topographic conditions.
The tunnel body section of the flood discharge tunnel comprises a flood discharge tunnel non-pressure section and a flood discharge tunnel falling tail section, which are all of urban portal-shaped sections and are divided into four basic lining types with the thickness of 1.0m, 1.2m, 1.5m and 2.5m according to the characteristics of different lining thicknesses, surrounding rocks and the like. The 4 types of structures are the same, the section behind the lining is shown in figure 4, only the thickness is changed, wherein, the low-heat cement concrete of the flood discharge tunnel non-pressure section (upper flat section, embodiment I) is the same as that shown in figure 4, the concrete top arches of the flood discharge tunnel falling tail section are the same, and the bottom plate and the side wall are C9060W10F150 impact and abrasion resistant low heat cement concrete (example II). The maximum allowable temperature for the flood tunnel lining concrete design is shown in table 3.
Table 3 unit of maximum temperature allowed during construction of flood tunnel lining concrete: c
Carry out temperature control to the concrete at the overall process of concrete placement and maintenance, avoid the concrete fracture, the design requirement temperature control measure includes:
(1) the mixing proportion of the concrete is optimized, and the crack resistance of the concrete is improved.
(2) Reasonably arranging concrete construction procedures and construction progress and striving to improve the construction management level.
(3) And controlling the highest temperature in the concrete. The effective measures comprise the reduction of the concrete pouring temperature, the reduction of the hydration heat temperature rise of the cementing material, the initial water supply and the like. And (5) water cooling time, wherein the surface temperature of the concrete is required to reach the air temperature of the tunnel, and the water cooling time is generally required to be 10-20 d. Controlling the pouring temperature of the lining concrete, wherein the pouring temperature is 20 ℃ in 4-9 months; the temperature of 10 months to 3 months in the next year is 18 ℃. The concrete transporting tool should have heat insulation and sun shading measures, so that the concrete insolation time is shortened, and the temperature rise in the concrete transporting and pouring process is reduced. Concrete pouring in high-temperature time is avoided as much as possible, and pouring in low-temperature seasons, morning and evening and night with low air temperature is fully utilized.
<Example one>1#Water cooling optimization control water temperature calculation for 143 th unit lining concrete of upper flat section of flood discharge tunnel
1#143 th unit of the upper flat section of the flood discharge tunnel, an urban portal tunnel-shaped lining, wherein the lining thickness of the side wall is 1.0m, annular construction parting joints are arranged every 12m along the axial direction of the flood discharge tunnel, III-class surrounding rocks, and a bottom plate and the side wall of a lining structure are C 9040 low heat cement concrete, as shown in fig. 4. Pouring concrete by stages 3: side walls, a rear arch and a bottom plate. The calculation of the side wall lining concrete pouring water cooling optimization control water temperature is introduced. The basic data of temperature control are the same as above. Moisturizing and maintaining by adopting normal-temperature tap waterAnd 90d, introducing water for cooling to control the internal temperature of the concrete.
As shown in fig. 2, the method for calculating the optimal water temperature for controlling the water cooling of the concrete with the thin-wall lining structure provided by the embodiment includes the following steps:
step 1-1, the basic data of the lining structure engineering are sorted and analyzed. The method comprises the steps of collecting data related to temperature control and crack prevention of the lining concrete, and analyzing the importance of the temperature control and crack prevention of the lining concrete.
1#Basic data of 143 th unit lining structure (figure 4) of the upper flat section of the spillway tunnel comprises: the thickness H is 1.0m, the side wall C is 40MPa, the temperature control and crack prevention, the water cooling, the design technical requirements and the like are as described above. As the flood discharge tunnel of the hydropower station of the white crane beach is a level 1 building, the water flow speed reaches nearly 50m/s to the maximum extent, and the temperature control and crack prevention of the lining concrete are very important. Depending on design requirements, effective measures including water cooling for temperature control are required.
Step 1-2, analyzing the technical requirements of temperature control design of lining concrete. The concrete temperature control method comprises the technical requirements of concrete temperature control, allowable maximum temperature, temperature control anti-cracking measures and the like.
Based on the above engineering data of the hydropower station in the white Crane beach 1#Concrete is lined in the 143 th unit of the upper flat section of the flood discharge tunnel, and pouring temperature needs to be controlled, and water cooling measures need to be taken. Pouring is carried out at the temperature of less than or equal to 20 ℃ within 18 days after 5 months, and the allowable maximum temperature of the lining concrete with the thickness of 1.0m in the upper flat section is 38 ℃ according to the design requirements of the table 2.
Step 1-3, analyzing a construction temperature control measure scheme:
according to the basic data, the water-cooling water pipes are arranged, and single-layer water pipes (shown in figure 5) are arranged along the axial direction of the side wall (lining plane) and at a distance of 1.5m in the height direction; cooling with cooling water with water flow of 48m3And d, controlling.
Calculated from equation 1. Substituting H of 1.0m and C of 40MPa into formula 1Get Twy＝10.50℃。
Step 3, optimizing a water cooling temperature control scheme of the concrete of the lining structure:
the original design requires water cooling, but the water temperature is not clear. The temperature of tap water of the white crane beach hydropower station in 5 months is generally 20-25 ℃, and is higher than the optimal control water temperature. In order to obtain the optimal temperature control anti-cracking effect, the hydropower 5 is locally provided with a special cooling water refrigeration system at the opening of the flood discharge tunnel, so that the water temperature can be optimally controlled in real time. The construction temperature control scheme is determined in the structure section, and the structure section is cooled by introducing 10.5 ℃ refrigeration water.
Step 4, analyzing the temperature control effect of the lining concrete:
the concrete pouring time period of 143 units is 2019, 5, 11, 21: 45 hours-2019, 5 months and 13 days 03: and (15) hours. The hydropower 5 construction period carries out temperature control related detection: the average casting temperature is 15.357 ℃; the average temperature in the tunnel in the casting period is 22.25 ℃; the water cooling water temperature is 10.5 ℃, and the average water flow is 2m3H (2-3 m before the highest temperature occurs)3H; 1-2 m after the generation3The same applies below).
The concrete is poured to reach the height of the side wall 1/2, water cooling starts to be carried out by covering a thermometer, and meanwhile the internal temperature of the concrete starts to be observed, and the result is shown in figure 6. Left 5 months, 19 days 15: 51, the water cooling is stopped, and the water cooling is 7 d.
According to the detection results, the highest temperature and the maximum internal surface temperature difference inside the finishing 143 unit lining concrete are shown in table 4.
Meter 4143 unit lining concrete internal temperature and internal surface temperature differential
| Location of a body part | temperature/deg.C for covering | Tmax/℃ | Time of arrival | Temperature rise/. degree.C | ΔTmax/℃ | Speed of temperature drop |
| Inside the side wall | 18.62 | 31.89 | 62h，2.6d | 13.27 | 5.06(2.96d) | |
| Outside of side wall | 17.43 | 32.97 | 62h，2.6d | 15.54 | 1.08℃/d |
The observation result of temperature control shows that: calculating the water temperature by a formula 1 and cooling the water at 10.5 ℃ by water and lining the concrete Tmax31.89 ℃ and 32.97 ℃ which are both less than the maximum allowable temperature of 38 ℃; the maximum inner surface temperature difference is 5.06 ℃, and is relatively small; the average temperature drop speed is 1.08 ℃/d and is far less than the allowable value of 2.0 ℃/d. And (4) checking in situ without any temperature crack.
FIG. 6 also shows the result of finite element method simulation computation, concrete Tmax34.21 ℃ is lower than the design allowable maximum temperature of 38 ℃; the maximum inner surface temperature difference is 4.2 ℃,relatively small; the average temperature drop speed is 1.28 ℃/d, the average temperature drop speed of 7d is 0.82 ℃/d, which is far less than the allowable value of 2.0 ℃/d. The anti-cracking safety coefficient is more than 1.6, and temperature cracks can not occur. The temperature and temperature control anti-cracking effect is consistent with the field actual measurement result.
By combining the analysis, the optimal temperature control anti-cracking effect can be obtained by calculating the water temperature through water cooling according to the formula 1. The formula 1 is scientific, scientifically reflects the relation between the thickness and the strength of the lining structure and the temperature of water cooling, realizes the goal of effectively controlling the highest temperature and the maximum inner surface temperature difference in concrete through water cooling, optimizes the temperature reduction speed and maximizes the benefit.
<Example two>1#Calculation of water temperature of 93 th unit lining concrete water cooling optimization control of flood discharge tunnel falling tail
1#93 th unit of flood discharge tunnel falling tail, city portal lining, side wall lining thickness of 1.5m, circumferential construction joints arranged every 12m along the axial direction of the flood discharge tunnel, IV-class surrounding rocks, and C-type bottom plate and side wall of lining structure9060W10F150 impact-resistant wear-resistant low-heat cement concrete, as shown in figure 4 (the section size is unchanged after lining, the thickness is 1.5m, and the bottom plate and the side wall are C9060W10F150 impact-resistant and wear-resistant low-heat cement concrete). Pouring concrete by stages 3: side walls, a rear arch and a bottom plate. The calculation of the side wall lining concrete pouring water cooling optimization control water temperature is introduced. The basic data of temperature control are the same as above. And (5) moisturizing and maintaining for 90 days by adopting normal-temperature tap water, and introducing water for cooling to control the internal temperature of the concrete.
As shown in fig. 2, the method for calculating the optimal water temperature for controlling the water cooling of the concrete with the thin-wall lining structure provided by the embodiment includes the following steps:
step 1-1, the basic data of the lining structure engineering are sorted and analyzed. The method comprises the steps of collecting data related to temperature control and crack prevention of the lining concrete, and analyzing the importance of the temperature control and crack prevention of the lining concrete.
1#93 rd unit lining structure basic data of the spillway tunnel falling tail section comprises: thickness H1.5 m, side wall C60 MPa, temp. control and anti-crackingAnd the water cooling, the design technical requirements and the like are as described above. As the flood discharge tunnel of the hydropower station of the white beach is a level 1 building, the dragon falling tail section is a structural section with the maximum water flow speed, which reaches nearly 50m/s, and the temperature control and crack prevention of concrete are very important. Depending on design requirements, effective measures including water cooling for temperature control are required.
Step 1-2, analyzing the technical requirements of temperature control design of lining concrete. The concrete temperature control method comprises the technical requirements of concrete temperature control, allowable maximum temperature, temperature control anti-cracking measures and the like.
Based on the above engineering data of the hydropower station in the white Crane beach 1#Concrete is lined in the 93 th unit of the falling tail section of the flood discharge tunnel, and pouring temperature needs to be controlled, and water cooling measures need to be taken. Pouring is carried out at 8 months and 13 days, the pouring temperature is less than or equal to 20 ℃, and the allowable maximum temperature of the lining concrete with the thickness of 1.5m is 42 ℃ according to the design requirement of the table 2.
Step 1-3, analyzing a construction temperature control measure scheme.
According to the basic data, the water-cooling water pipes are arranged, and single-layer water pipes (shown in figure 5) are arranged along the axial direction of the side wall (lining plane) and at a distance of 1.5m in the height direction; cooling with cooling water with water flow of 48m3And d, controlling.
Calculated from equation 1. Substituting H of 1.5m and side wall C of 60MPa into formula 1 to obtain Twy＝6℃。
Step 3, optimizing a water cooling temperature control scheme of the concrete of the lining structure:
the original design requires water cooling, but the water temperature is not clear. In order to obtain the optimal temperature control anti-cracking effect, the hydropower 5 is locally provided with a special cooling water refrigeration system at the opening of the flood discharge tunnel, so that the water temperature can be optimally controlled in real time. And (3) determining a construction temperature control scheme in the structural section, and introducing 6 ℃ refrigeration water for cooling.
Step 4, analyzing the temperature control effect of the lining concrete:
1#lining a concrete unit 93 on the side wall of the falling tail section of the flood discharge tunnel, opening the chamber in 2018, 8, month 11, 18:00, closing the chamber in 2018, 8, month 13, 05: 50; temperature ofThe middle part of the meter embedded left and right side walls within 2m is respectively embedded with 1 thermometer. And (3) water cooling time period: 11/2018/month-9/month-1/2018. Water is introduced for cooling, and the temperature is 6 ℃. The maximum temperature of the side wall is 36.93 ℃ and 38.58 ℃ respectively after about 61 hours, the maximum temperature rise of the concrete is 21.12 ℃, the maximum daily cooling rate is 0.41 ℃/d, and the minimum daily cooling rate is 0.26 ℃/d, which is shown in figure 7. And (4) checking in situ without any temperature crack.
The results show that the concrete Tmax36.93 ℃, 38.58 ℃ and less than the maximum design allowable temperature of 42 ℃; the maximum value of the temperature drop speed is 0.41 ℃/d, the minimum value is 0.26 ℃/d, and the temperature drop speed is far less than the allowable value of 2.0 ℃/d. The field inspection shows that no temperature crack exists, and the temperature control anti-cracking effect has good effect.
By combining the analysis, the optimal temperature control anti-cracking effect can be obtained by calculating the water temperature through water cooling according to the formula 1. The formula 1 is scientific, scientifically reflects the relation between the thickness and the strength of the lining structure and the temperature of water cooling, achieves the aim of controlling the highest temperature and the maximum inner surface temperature difference inside concrete through water cooling, optimizes the temperature reduction speed and maximizes the benefit.
The results of the above embodiments show that the method of the present invention can be applied to any lining structure (including different civil engineering types, different structural forms, different thicknesses, different strengths, etc.), and water cooling, temperature control and anti-cracking optimization of lining concrete are performed. The method is scientific. Water cooling optimal control water temperature TwyThe calculation formula 1 scientifically reflects the influence of the main parameters of the thickness and the strength grade of the lining concrete structure.
< third embodiment > water cooling and water temperature optimization control system for lining concrete
The embodiment provides a system capable of automatically implementing the method for controlling the optimization of the water temperature of lining concrete through water and cooling water, and the system comprises: the device comprises an input display part, a storage part, a calculation part, a water cooling part and a control part.
The input display part is used for leading the operator to input the collected water cooling and temperature control data of the lining concrete according to the prompt and can carry out corresponding display according to the operation instruction input by the operator. For example, the input display part can be operated according to the operation fingerThe water cooling optimization control water temperature T calculated by the calculating partwyThe display can also display the measures and progress of the water cooling performed by the water cooling unit according to the operation command.
The storage part is communicated with the input display part and stores the input lining concrete temperature control data, and the lining concrete temperature control data comprises the thickness H of the lining concrete and the strength grade C of the lining concrete.
The calculation part is in communication connection with the storage part and the input display part, and based on the data for temperature control of the lining concrete, the following formula is adopted to calculate the optimal control water temperature T for water cooling of the lining concretewy：
Twy＝10.68H+0.16C-0.25HC-0.53H2+3.95
In the formula: h is the thickness of the lining concrete; c is the strength grade of the lining concrete 90d in the design age.
The water cooling part is communicated with the calculating part and the storage part, and the water temperature T is optimally controlled according to the water cooling temperature control data and the water cooling optimization control data of the lining concretewyAnd executing water cooling measures.
The control part is connected with the input display part, the storage part, the calculation part and the water cooling part in a communication way and controls the operation of the input display part, the storage part, the calculation part and the water cooling part.
The above embodiments are merely illustrative of the technical solutions of the present invention. The method and system for controlling the temperature of cooling water by feeding water to the lining concrete in the present invention are not limited to the contents described in the above embodiments, but are subject to the scope defined by the claims. Any modification or supplement or equivalent replacement made by a person skilled in the art on the basis of this embodiment is within the scope of the invention as claimed in the claims.
Claims (8)
1. The method for optimally controlling the water temperature of water cooling for lining concrete is characterized by comprising the following steps of:
step 1, collecting data for temperature control of lining concrete;
step 2, calculating the water cooling optimal control water temperature T of the lining concretewy：
Twy＝10.68H+0.16C-0.25HC-0.53H2+3.95
In the formula: h is the thickness of the lining concrete; c, designing age strength grade for lining concrete 90 d;
step 3, optimally controlling the water temperature T according to water coolingwyAnd optimizing water cooling measures of the lining concrete.
2. The method for controlling the optimization of the water temperature of lining concrete through water and cooling water as claimed in claim 1, wherein:
in step 3, the optimized water cooling measure is to adopt the temperature TwyThe cooling water cools the lining concrete.
3. The method for controlling the optimization of the water temperature of lining concrete through water and cooling water as claimed in claim 1, wherein:
wherein, the step 2 is executed by adopting a control processing device, and the optimal control water temperature T of water cooling is determinedwy。
4. The method for controlling the optimization of the water temperature of lining concrete through water and cooling water as claimed in claim 1, wherein:
and (3) executing the step (1) by adopting a control processing device, and enabling an operator to input lining concrete temperature control data according to the prompt and store the lining concrete temperature control data.
5. The method for controlling the optimization of the water temperature of lining concrete through water and cooling water as claimed in claim 1, wherein:
wherein, the step 3 is also executed by adopting a control processing device, and the water temperature T is optimally controlled according to the water coolingwyAnd determining a water cooling measure, and controlling a water cooling device to carry out water cooling maintenance on the lining concrete.
6. The lining concrete water cooling water temperature optimizing control system is characterized by comprising:
an input display part for the operator to input the collected water cooling and temperature controlling data for lining concrete;
a storage part for storing the input lining concrete temperature control data;
a calculating part for calculating the water temperature T of the lining concrete through water cooling optimization control by adopting the following formula based on the data for the temperature control of the lining concretewy：
Twy＝10.68H+0.16C-0.25HC-0.53H2+3.95
In the formula: h is the thickness of the lining concrete; c, designing age strength grade for lining concrete 90 d;
a water cooling part for optimally controlling the water temperature T according to the water coolingwyPerforming water cooling measures; and
and the control part is in communication connection with the input display part, the storage part, the calculation part and the water cooling part and controls the operation of the input display part, the storage part, the calculation part and the water cooling part.
7. The lining concrete water-through cooling water temperature optimization control system of claim 6, characterized in that:
wherein the input display unit further performs optimal control of the water cooling optimal control water temperature T calculated by the calculation unit based on an operation commandwyAnd displaying.
8. The lining concrete water-through cooling water temperature optimization control system of claim 6, characterized in that:
wherein the input display unit further displays a water cooling measure executed by the water cooling unit according to an operation command.
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