CN110219462B

CN110219462B - Method for pouring and drying serpentine concrete for dry protection device

Info

Publication number: CN110219462B
Application number: CN201910325838.0A
Authority: CN
Inventors: 梁权刚; 杨浩; 崔正严; 张明皋; 沈益军; 钱伏华
Original assignee: China Nuclear Industry Huaxing Construction Co Ltd
Current assignee: Jiangsu Zhonghe Huaxing Engineering Testing Co., Ltd; China Nuclear Industry Huaxing Construction Co Ltd
Priority date: 2019-04-22
Filing date: 2019-04-22
Publication date: 2021-05-11
Anticipated expiration: 2039-04-22
Also published as: CN110219462A

Abstract

A method for pouring and drying serpentine concrete for a dry protection device belongs to the technical field of nuclear power engineering. The invention comprises the technological requirements of serpentine concrete pouring for the dry protection device: the consistency and temperature of the concrete mixture, the concrete charging mode, the concrete discharging height, the concrete distributing position, the concrete layering thickness, the concrete vibration and the like; the serpentine concrete drying process requirements are as follows: the heat source for drying, the heating rate and time, the heat preservation time, the drying degree monitoring, the cooling rate and time and the like. The serpentine concrete for the dry protection device obtained by the process has good volume stability and uniform distribution of crystal water, can resist radiation under a high-temperature condition for a long time, effectively shields neutron rays, and meets the design requirements of the dry protection device of a nuclear reactor.

Description

Method for pouring and drying serpentine concrete for dry protection device

Technical Field

The invention belongs to the technical field of nuclear power engineering, and particularly relates to a method for pouring and drying serpentine concrete for a dry protection device, which is suitable for pouring and drying serpentine concrete for a shielding structure or a device for shielding radiation and neutron rays under a long-term high-temperature condition.

Background

Serpentine is rich in crystal water and is not easy to escape in a high-temperature environment, so that the serpentine has a good neutron ray shielding effect, and the dry protection device is used for shielding neutron rays generated by an atomic reactor by filling serpentine concrete. However, the serpentine concrete is affected by manufacturing, pouring and the like after being manufactured into the serpentine concrete, so that the neutron ray shielding effect is affected by uneven distribution of crystal water caused by uneven quality of the serpentine concrete, and meanwhile, the uneven quality also brings volume instability of the serpentine concrete in high-temperature operation. With the increasing requirements for nuclear power domestic autonomous nuclear safety, nuclear reactor devices need safer shielding protection and safer and more reliable operation.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a serpentine concrete pouring method for a dry protection device and a drying method thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for pouring and drying serpentine concrete for a dry protection device is characterized by comprising the following steps:

the method comprises the following steps: putting accurately weighed serpentine concrete raw materials into a stirrer and stirring for 15-30 minutes to obtain uniform serpentine concrete with slump of 80-150 mm;

step two: loading the stirred serpentine concrete into a tank truck for transportation, wherein the tank truck keeps the tank body to be transported to a pouring position at a low speed during transportation, and when the concrete is unloaded to a dry protection device, an iron shovel, a lifting bucket (small capacity), a chute or a chute are adopted to load the concrete according to the shape and the volume of the structure, and the blanking height of the concrete is not more than 1 m;

step three: before the serpentine concrete is poured, a heating rod and a thermocouple are installed in a hollow cylindrical dry protection device;

step four: pouring serpentine concrete of the dry protection device in two parts, pouring the lower dry protection device, welding the upper dry protection device to the lower dry protection device after the lower dry protection device obtains local strength, and pouring concrete of the upper dry protection device;

step five: and drying and cooling the concrete of the dry protection device.

In order to optimize the technical scheme, the specific measures adopted further comprise:

furthermore, in the first step, a forced mixer is adopted for mixing the serpentine concrete, the error of water and cement weighed by the serpentine concrete raw materials is +/-1%, the error of serpentine aggregate is +/-2%, the serpentine aggregate with the humidity of more than 2% is used, the consumption of the serpentine aggregate is increased according to the humidity percentage, and the consumption of water is respectively reduced.

Further, in the second step, the container for transporting the serpentine concrete mixture is systematically cleaned and flushed by using the same stirring water so as to eliminate the possibility of mixing other hardened concrete blocks, and the serpentine concrete is transported to a pouring gate of a dry protection device from the stirring, so that the concrete mixture is prevented from segregation.

Further, the third step specifically includes:

1) installing a lower dry protection heating rod: the lower dry protection device is evenly divided into 15 sections along the circumferential direction of the cross section, 1 heating rod with the size of 2300 multiplied by 500mm and 2300 multiplied by 170mm is pre-buried in each section, the heating rod is made of phi 10mm steel bars, and the heating rod cannot be contacted with the dry protection device body when being installed;

2) installing an upper dry protection heating rod: the upper dry protection device is uniformly divided into 15 sections along the circumferential direction of the cross section, two heating rods with the size of 3100X 200mm are embedded in each section, the heating rods are made of phi 10mm steel bars, and the heating rods cannot be installed to be in contact with the dry protection device body;

3) installing a lower dry protection thermocouple: the lower dry protection thermocouples are distributed in 5 segments, including 3 segments at trisections and 2 separate segments; the number of the lower dry protection thermocouple holes is 32, wherein 20 holes are reserved at the bottom plate of the lower dry protection device, 6 holes are reserved on the outer wall of the lower dry protection device, and the rest 6 holes are arranged in the tubular heater;

4) installing an upper dry protection thermocouple: the upper dry protection thermocouples are distributed in 5 segments, including 3 segments located at trisections and 2 separate segments; the number of the upper dry protection thermocouple holes is 35, wherein 23 upper dry protection devices are reserved at the top, 6 upper dry protection devices are reserved at the outer wall, and the rest 6 dry protection devices are arranged in the tubular heater.

Further, in the fourth step, the serpentine concrete is poured according to the following method:

1) transporting the serpentine concrete into material storage boxes on a construction scaffold of a dry protection device, wherein the material storage boxes are distributed at intervals of 120 degrees along trisection positions of cross sections of an upper dry protection device and a lower dry protection device, and then performing concrete pouring on the serpentine concrete mixture along a cavity of a container structure;

2) uniformly distributing the capacity of the concrete mixture filled into the dry protection device at the same time along a horizontal plane, wherein the layering thickness is 150-200 mm, and then vibrating by using an inserted vibrator with the rod diameter of 25-75 mm, wherein the distance between the positions of the vibrators is not more than 1.5 times of the operation radius;

3) during vibration, before each vibration displacement, the concrete mixture is ensured to be compacted, namely, the concrete stops sinking and the surface of the concrete has floating slurry, and the floating slurry has the sign of flowing out from the hole between the inner shell and the outer shell of the upper dry protection device and the lower dry protection device, so that the concrete cannot be separated due to over vibration under any condition;

4) during pouring, along with the increase of the concrete amount, if the laitance gushes out from the holes on the walls of the upper and lower dry protection devices, the holes are plugged by using wood plugs, if no laitance gushes out from the holes, the pouring concrete amount is increased in the areas of the holes, and simultaneously vibration is continuously carried out until the laitance gushes out from the holes so as to ensure that each cavity of the upper and lower dry protection devices is fully poured with concrete, and the holes plugged by using the wood plugs on the walls of the upper and lower dry protection devices are opened 5-6 hours after the concrete pouring is finished;

5) and after the concrete is stirred, pouring is started within 40 minutes, the pouring time of the mixed concrete mixture is not more than 60 minutes each time, the mold-entering temperature of the concrete mixture is not lower than 10 ℃, the height of the concrete mixture within 12 hours is not more than 1m, and the time interval between the pouring of one layer of concrete and the pouring of the next layer of concrete is not more than 1.5 hours.

Further, the newly cast concrete is hardened at the temperature of not lower than 15 ℃, after the pouring is finished, the exposed surface of the newly cast concrete is covered by a polyethylene film or a coarse linen for 6 hours, the lower cover is covered for 2 hours when the atmospheric temperature is higher than 25 ℃, and after the pouring of the concrete is finished, the newly cast concrete is hardened at the temperature of 15-50 ℃ for 3 days.

Further, the fifth step specifically includes:

in the process of pouring the serpentine concrete of the upper and lower dry protection devices, respectively manufacturing a group of 3 test blocks with the sizes of 150 multiplied by 150mm and 100 multiplied by 100mm, and embedding a heating rod in the test blocks with the sizes of 150 multiplied by 150mm, wherein the test blocks are used for controlling the dry protection device concrete to be dried to constant weight;

a control monitoring test block of 150 multiplied by 150mm made of serpentine concrete is taken to be placed together with a dry protection device, a control test block of 100 multiplied by 100mm is placed in a civil engineering test room, the control monitoring test block of 150 multiplied by 150mm and the dry protection device concrete are dried together, and the control test block of 100 multiplied by 100mm is subjected to heat treatment under the condition of the test room in the same way.

Further, the heat treatment is carried out by the following steps:

1) heating to 150 +/-25 ℃, wherein the heating speed is not more than 25 ℃/h;

2) keeping the temperature at 150 +/-25 ℃ for 3 days;

3) and continuously heating to 200-250 ℃, wherein the heating speed is not more than 25 ℃/h.

Further, the control monitoring test block of 150 multiplied by 150mm and the control test block of 100 multiplied by 100mm which are heat treated at the temperature of 200-250 ℃ are weighed once every 6 hours at the temperature of 200-250 ℃, the mass is weighed for three times continuously, the result is dry, after the result is stable, the heating is stopped, the dry protection device is cooled by the serpentine concrete, and the ambient temperature is not lower than 15 ℃ in the concrete cooling process.

The invention has the beneficial effects that: the serpentine concrete for the dry protection device obtained by the method has good volume stability and uniform distribution of crystal water, can resist radiation under a high-temperature condition for a long time, effectively shields neutron rays, and meets the design requirements of the nuclear reactor dry protection device.

Drawings

Fig. 1 is an overall sectional schematic view of a dry guard.

Fig. 2 is a view of the lower dry guard heater bar and thermocouple arrangement.

Fig. 3 is a schematic view of the installation position of the heating rod at the No. 6 section of the lower dry protection device.

FIG. 4 is a diagram of an upper dry guard heater rod and thermocouple arrangement.

Fig. 5 is a schematic view of the mounting position of the heating rod at section 6a of the upper dry guard.

FIG. 6 is a schematic view of the lower dry guard thermocouple installation.

Fig. 7 is a view of the thermocouple arrangement on the outer wall at section 6 of the lower dry guard.

FIG. 8a is a view of the thermocouple pre-hole arrangement on the outer wall of the lower dry guard.

FIG. 8B is a schematic sectional view of the thermocouple well in the B-B direction of the outer wall of the lower dry guard.

FIG. 9 is a schematic view of the upper dry guard thermocouple installation.

Fig. 10 is a view of thermocouple placement at a section of the upper dry guard 6 a.

FIG. 11a is a diagram of the upper dry guard thermocouple cross-layout.

FIG. 11b is a schematic top dry guard thermocouple cross-section in the direction C-C.

Fig. 12a is a schematic view of the installation of the pre-buried heating rod in the test block.

FIG. 12b is a schematic cross-sectional view of a heating rod pre-embedded in a test block in the direction D-D.

Fig. 13 is a graph of serpentine concrete drying temperature control.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings.

As shown in fig. 1, the dry protection device is a hollow cylindrical structure and is divided into an upper dry protection device and a lower dry protection device, wherein the dry protection device comprises a top plate, a bottom plate, an inner wall and an outer wall which are welded by steel plates. Before pouring, the space between the inner wall and the outer wall is uniformly divided into a plurality of chambers, so that the subsequent concrete pouring can be facilitated.

The invention provides a serpentine concrete pouring and drying method for a dry protection device, which comprises the following steps:

1. accurately weighing the serpentine concrete raw materials: ordinary portland cement: 362 kg; water: 270 kg; (3-40) mm serpentine crushed stone: 1048 kg; (0.25-1.25) mm serpentine sand: 639kg of serpentine concrete mixed in a forced mixer and taken out of the machine, the results are shown in Table 1.

TABLE 1 Serpentine concrete out-of-machine results

Time of stirring	Slump of machine out	Temperature of discharge
			25 minutes	120mm		20℃

2. And (3) loading the stirred serpentine concrete into a concrete tank truck cleaned by stirring water, conveying the concrete tank truck to a pouring position in a low-speed running state, loading the concrete by using an iron shovel, a lifting bucket and a chute when the concrete is unloaded to a dry protection device, and ensuring that the unloading height of the concrete is not more than 1 m.

3. The method comprises the steps of firstly pouring a lower dry protection device, welding an upper dry protection device on the lower dry protection device after the lower dry protection device obtains local strength, and finally pouring concrete of the upper dry protection device.

4. The implementation method for pouring the serpentine concrete comprises the following steps:

(1) and (3) transporting the serpentine concrete to the equal-3-degree positions on the lower dry protection device and distributing the serpentine concrete in a storage box on the construction scaffold according to 120 degrees, and then performing concrete pouring on the serpentine concrete mixture along a structural cavity of the dry protection device.

(2) The capacity of the concrete mixture filled into the dry protection device at the same time is uniformly distributed along the horizontal plane, the layering thickness is 160mm, then an inserted vibrator with the rod diameter of 50mm is used for vibrating, and the distance between the positions of the vibrator is 1.5 times of the operation radius.

(3) During the vibration, guarantee before each vibration displacement that concrete mixture has closely knit, concrete stops to sink promptly and its surface appear the laitance to and the laitance appears from the hole between the interior outer shell of dry protection device about the hole midstream such as gush, must not lead to the concrete segregation because of excessive vibration under any circumstance.

(4) During pouring, with the increase of the concrete amount, the laitance gushes out from the holes on the upper and lower concrete container walls of the dry protection device, and at the moment, the holes are plugged by using wood plugs. If no laitance emerges from the holes, the amount of concrete poured is increased in the area of these holes, while the vibrating is continued until the laitance emerges in the holes to ensure that each chamber of the dry protection device is filled with concrete, and inspection holes with a cut diameter of 10mm on the upper surface of the box-like annular metal structure are used as air outlet holes and for monitoring the concrete pouring, the inspection holes being located as far away from the process holes as possible. And 6 hours after the concrete pouring is finished, opening the hole blocked by the wooden plug on the wall of the upper and lower dry protection devices.

(5) After the concrete mixing was completed, the casting was started within 40 minutes. The pouring time of the concrete mixture prepared each time is controlled within 50 minutes, and the mold-entering temperature of the concrete mixture is 20 ℃. The height of the concrete in 12 hours at the pouring speed is 0.9m, and the time interval between the pouring of one layer of concrete and the pouring of the next layer of concrete is not more than 1.5 hours.

5. The maintenance implementation method of the serpentine concrete after pouring comprises the following steps: the poured serpentine concrete is hardened at a temperature of 20 ℃. After casting, the exposed concrete surface was covered with a polyethylene film and wetted material (scrim) for 6 hours and then hardened at 20 ℃ for 3 days.

6. And welding the upper dry protection device to the lower dry protection device, and finally pouring the concrete of the upper dry protection device. The method of implementation is the same as in

sections

4 and 5.

7. The implementation method for installing the heating rod and the thermocouple before the serpentine concrete pouring comprises the following steps:

(1) the lower dry protection heating rod is installed. Before serpentine concrete is poured, 1 heating rod with the size of (2300 multiplied by 500) mm and (2300 multiplied by 170) mm is pre-buried in each section of 15 sections (1-15 in figure 2) of the lower dry protection device, the heating rods are made of phi 10mm steel bars, the heating rods cannot be in contact with a dry protection device body when being installed, and the installation diagrams are shown in figures 2-3. The black dots in the figure are rod heaters (i.e., heating rods), such as 15-1, 15-2, 6-1, 6-2; the shaded area in the figure is the thermocouple mounting area, and 8-3 and 14-3 are two single thermocouple mounting positions; the mounting positions at the remaining segments correspond to those of fig. 3.

(2) And installing an upper dry protection heating rod. The upper dry protection device 15 sections (1 a-15 a in figure 4) are embedded with 2 heating rods with the size (3100 x 200) mm in each section before the serpentine concrete is poured, the heating rods are made of phi 10mm steel bars, the heating rods cannot be in contact with the dry protection device body, and the installation diagrams are shown in figures 4-5. The black dots in the figure are rod heaters, such as 15a-1, 15a-2, 6a-1, 6 a-2; the shaded area in the figure is a thermocouple mounting area; 8a-3 and 14a-3 are two independent thermocouple installation positions; the mounting positions at the remaining segments correspond to those of fig. 5.

(3) And installing a lower dry protection thermocouple. The number of the thermocouple holes of the lower dry protection is 32, 20 holes are reserved at the bottom plate of the lower dry protection device, the hole diameter is 18mm, and the hole depth is 17 of 500mm (T6-3, T6-4, T6-5, T66 and T67 of No. 6 subsection in figure 6, the positions of No. 1 and No. 11 subsections are the same, so the total number is 15, and in addition, the total number is 17 by the single two thermocouple installation positions 8-3 and 14-3 in figure 2); the hole depth was 3 of 100mm (in FIG. 6, T6-2 in the No. 6 segment, and 3 in total because the No. 1 and No. 11 segments are the same). The outer wall of the lower dry protection device is reserved with 6 holes, the hole diameter is also phi 18mm, and the hole depth is 3 of 285mm (in figure 7, T6-10 of segment No. 6 is the same with segments No. 1 and No. 11, so the total number is 3); the hole depth was 3 of 50mm (T6-9 in the No. 6 segment in FIG. 7, and the number 1 and No. 11 segments are the same, so total number 3). The remaining 6 were installed in the tubular heater (the number 6 segments in FIG. 6, T6-1, T6-8, and the

number

1 and 11 segments were the same, so 3 in total). The installation diagram is shown in the attached figures 6-8 b.

(4) And installing an upper dry protection thermocouple. The number of the upper dry protection thermocouple holes is 35, the number of the upper dry protection thermocouple holes is 23, the hole diameter phi is 18mm, and the hole depth is 6 of 800mm (6 a segments T6a-4 and T6a-5 in FIG. 9, two segments are arranged in each segment, and the 1a segments and the 11a segments are the same, so the total number is 6); 8 holes with the depth of 650mm (in FIG. 9, 3 holes are arranged at the segment No. 6a, T6a-3, T6a-8, and the segments No. 1a and No. 11a, and one more than the segment No. 6a is arranged at the positions of T1a-10 and T11a-10, so that the total number is 8); 3 holes with a depth of 100mm (T6 a-2 at segment No. 6a in FIG. 9, and 3 holes at segments No. 1a and No. 11a in total, which are the same); 6 holes 500mm deep (6 holes in FIG. 9 at segment 6a, T6a-6, T6a-7, and 6 holes at segments 1a and 11a, which are the same). The dry protection device is provided with 3 holes with 6 holes, the hole diameter is phi 18mm, and the hole depth is 285mm (the number of the 6a sections is 1, the number of the 1a sections is the same as the number of the 11a sections, so the total number is 3 in fig. 11 b); the hole depth was 3 of 50mm (1 at segment No. 6a, the same at segments No. 1a and No. 11a, and 3 in total, as shown in fig. 11 b). The remaining 6 were installed in the tubular heater (6 in total, 6, at the 6a segment in FIG. 9, T6a-1, T6a-9, and the 1a and 11a segments were the same). The installation diagram is shown in FIGS. 9-11 b, wherein FIG. 10 is a diagram of the thermocouple arrangement at the segment of the upper dry guard 6a (a cross-sectional installation diagram, taking thermocouple T6a-2 as an example, wherein a represents a power source, b represents a thermocouple, c represents concrete, and d represents a heater).

8. The drying control monitoring test block of the serpentine concrete and the manufacturing and implementing method of the control test block are as follows: in the process of pouring the serpentine concrete of the upper and lower dry protection devices, a group of 3 (150 × 150 × 150) mm (100 × 100 × 100) mm test blocks are respectively manufactured, and heating rods are embedded in the (150 × 150 × 150) mm test blocks, the test blocks are used for controlling the dry protection devices to dry the concrete to a constant weight, and the installation diagrams of the embedded heating rods in the test blocks are shown in attached figures 12a and 12 b. A (150X 150) mm control monitoring test block made of serpentine concrete is placed together with a dry protection device, and a (100X 100) mm control test block is placed in a civil engineering laboratory. The (150X 150) mm control and monitoring test block was co-dried together with the dry guard concrete and the (100X 100) mm control test block was heat treated in the same manner under laboratory conditions.

9. The drying and heating system of the serpentine concrete is implemented as follows:

(1) heating to 130 ℃, wherein the heating speed is 25 ℃/h;

(2) keeping the temperature at 130 ℃ for 3 days;

(3) the temperature is continuously increased to 210 ℃, and the temperature rising speed is 25 ℃/h. The (150X 150) mm control monitoring test block and the (100X 100) mm control test block which are heat treated at the temperature of 210 ℃ are weighed once every 6 hours at the temperature of 210 ℃ and are weighed three times continuously, and the result is stable, namely, the test block is dry. The oven-dried mass loss of the serpentine concrete when the mass was stable at 210 ℃ is shown in Table 2.

TABLE 2 quality loss results for serpentine concrete at 210 ℃ for stable quality

10. The serpentine concrete cooling requirement implementation method comprises the following steps: the weight of the (150X 150) mm control monitoring test block is weighed continuously for three times, after the result is stable, the heating is stopped, the dry protection device is cooled by the serpentine concrete, and the ambient temperature is 20 ℃ in the concrete cooling process. The actual temperature control curve of the heating, constant temperature and cooling of the serpentine concrete heating system is shown in figure 13.

11. Sampling and actually measuring the Poisson ratio during serpentine concrete pouring of the dry protection device: 0.26, elastic modulus value: 22.3GPa, linear expansion coefficient: 7.54X 10^-6at/DEG C, the linear expansion coefficient is (6-13). times.10^-6The low expansion value of/° C has good volume stability, and meets the design requirements of a nuclear reactor dry protection device.

12. After the serpentine concrete is poured and dried, a neutron detector is used for testing the distribution of crystal water of the dry protection structure, and the measured value is as follows:

(1) the total number of the measuring points of the lower dry protection 30 ionization channels is 240, the average value of the water content count is 236, the number of the measuring points with the water content count deviation larger than +/-10% is 26, and the total measuring point proportion is 10.8%;

(2) the total number of measuring points of the 19 ionization channels under the upper dry protection is 190, the average value of the water counting is 236, the number of measuring points with the water counting deviation larger than +/-10% is 5, and the total measuring point proportion is 2.6%; the total number of the measuring points of the upper dry protection 11 hexagonal ionization channels is 110, the average value of the water content count is 301, the number of the measuring points with the water content count deviation larger than +/-10% is 3, and the water content count accounts for 2.7% of the total number of the measuring points. The actually measured counting deviation is less than +/-15%, the crystal water is uniformly distributed, and the design requirement of the dry protection device of the nuclear reactor is met.

It should be noted that the terms "upper", "lower", "left", "right", "front", "back", etc. used in the present invention are for clarity of description only, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not limited by the technical contents of the essential changes.

The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.

Claims

1. A method for pouring and drying serpentine concrete for a dry protection device is characterized by comprising the following steps:

step two: loading the stirred serpentine concrete into a tank truck for transportation, wherein the tank truck keeps the tank body to be transported to a pouring position at a low speed during transportation, and when the concrete is unloaded to a dry protection device, an iron shovel, a lifting bucket, a chute or a chute is adopted to load the concrete according to the shape and the volume of the structure, and the unloading height of the concrete is not more than 1 m;

step three: before the serpentine concrete is poured, a heating rod and a thermocouple are installed in a hollow cylindrical dry protection device; the third step specifically comprises:

4) installing an upper dry protection thermocouple: the upper dry protection thermocouples are distributed in 5 segments, including 3 segments located at trisections and 2 separate segments; the number of the upper dry protection thermocouple holes is 35, wherein 23 upper dry protection devices are provided with reserved holes at the tops, 6 upper dry protection devices are provided with reserved holes on the outer walls, and the rest 6 dry protection devices are arranged in the tubular heater;

step five: and drying and cooling the concrete of the dry protection device.

2. The method for casting and drying serpentine concrete for dry protection devices as claimed in claim 1, wherein: in the first step, a forced mixer is adopted for mixing the serpentine concrete, the error of water and cement weighed by the serpentine concrete raw materials is +/-1%, the error of serpentine aggregate is +/-2%, the serpentine aggregate with the humidity of more than 2% is used, the consumption of the serpentine aggregate is increased according to the humidity percentage, and the consumption of water is respectively reduced.

3. The method for casting and drying serpentine concrete for dry protection devices as claimed in claim 1, wherein: in the second step, the container for transporting the serpentine concrete mixture is systematically cleaned and flushed by using the same stirring water so as to eliminate the possibility of doping other hardened concrete blocks, and the serpentine concrete is transported to a pouring gate of a dry protection device from the stirring, so that the concrete mixture is prevented from segregation.

4. The method for casting and drying serpentine concrete for dry protection devices as claimed in claim 1, wherein: in the fourth step, the serpentine concrete is poured according to the following method:

1) transporting the serpentine concrete to material storage boxes on a construction scaffold of the dry protection device, wherein the material storage boxes are arranged at intervals of 120 along trisections of the cross sections of the upper dry protection device and the lower dry protection device⁰Distributing, and then pouring concrete into the serpentine concrete mixture along the cavity of the container structure;

5. The method for casting and drying serpentine concrete for dry protection as claimed in claim 4, wherein: the newly cast concrete is hardened at the temperature of not lower than 15 ℃, after the casting is finished, the exposed surface of the newly cast concrete is covered by a polyethylene film or a coarse linen for 6 hours, the lower cover is covered for 2 hours when the atmospheric temperature is higher than 25 ℃, and after the casting of the concrete is finished, the newly cast concrete is hardened for 3 days at the temperature of 15-50 ℃.

6. The method for casting and drying serpentine concrete for dry protection devices as claimed in claim 1, wherein: the fifth step specifically comprises:

in the process of pouring the serpentine concrete of the upper and lower dry protection devices, respectively manufacturing a group of test blocks with the sizes of 150 multiplied by 150mm and 100 multiplied by 100mm, and embedding a heating rod in the test blocks with the sizes of 150 multiplied by 150mm, wherein the test blocks are used for controlling the dry protection device concrete to be dried to constant weight;

7. The method for casting and drying serpentine concrete for dry protection as claimed in claim 6, wherein: the heat treatment is carried out by the following steps:

2) keeping the temperature at 150 +/-25 ℃ for 3 days;

8. The method of claim 7, further comprising the steps of: the control monitoring test block of 150 multiplied by 150mm and the control test block of 100 multiplied by 100mm which are heat treated at the temperature of 200-250 ℃ are weighed once every 6 hours at the temperature of 200-250 ℃, the quality is weighed for three times continuously, after the result is stable, the heating is stopped, the dry protection device is cooled by the serpentine concrete, and the ambient temperature is not lower than 15 ℃ in the concrete cooling process.