Cold joint control method for pouring of concrete with different strength grades and temperature control box for pump pipe

Abstract

The invention discloses a cold joint control method for pouring concrete with different strength grades and a temperature control box for a pump pipe. The method comprises a concrete preparation process, a concrete pouring process and a maintenance monitoring process. By utilizing the characteristic that the concrete is easy to heat and difficult to cool, the temperature of the concrete is reduced at the beginning of pouring different kinds of concrete, and then the temperature of the to-be-poured concrete is adjusted to be 1-3 DEG C higher than that of the poured concrete according to the temperature of the poured concrete, so that the solidification speed of the poured concrete is smaller than that of the to-be-poured concrete; the purpose of simultaneous solidification is achieved, the problem that cold joints are generated due to different solidification time is solved, and the method is suitable for pouring concrete of different strength grades. Besides, by means of the arrangement of the metal formworks and the semiconductor chilling plates, continuous low-temperature output is carried out during pouring and concrete solidification, the solidification time is uniform, meanwhile, the complexity of pipeline arrangement is lowered, occupied space in concrete is reduced, and construction convenience and construction efficiency are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of concrete construction, and particularly relates to a cold joint control method for pouring concrete with different strength grades and a temperature control box for pump pipes. Background Art

[0002] During the concrete pouring process, a pump truck is usually used for pouring operations. The concrete is transported to the construction site by a concrete mixer truck, unloaded into the hopper of the pump truck, and then pumped by the pump truck for pouring. However, due to the limited carrying capacity of the concrete mixer truck and the bottleneck in the pumping efficiency of the pump truck, it often leads to the earlier solidification of the previously poured concrete than the later poured concrete, forming cold joints. This phenomenon is particularly obvious in concretes with different strength grades because the setting times of concretes with different strength grades themselves are different, and coupled with the influence of the pouring sequence, the cold joint problem is more prominent.

[0003] The cold joint phenomenon, as a common quality problem in concrete construction, has attracted much attention in recent years. Traditional solutions mainly rely on retarders to adjust the setting time of concrete, thereby reducing the generation of cold joints. However, the effect of retarders is limited and cannot completely solve the problem. Research shows that the setting speed of concrete is closely related to temperature: the higher the temperature, the faster the setting speed; the lower the temperature, the slower the setting speed. Based on this, this application proposes to solve the cold joint problem in the pouring of concretes with different strength grades by controlling the pouring temperature of concrete and combining the use of admixtures.

[0004] In addition, traditional temperature control methods usually involve embedding pipes inside the concrete and cooling by injecting water to control the temperature. However, this method has many drawbacks: the pipes are embedded in the concrete and cannot be removed later, which not only increases the construction complexity but also causes a large amount of pipe waste. At the same time, the embedded pipes will occupy the internal space of the concrete, affecting the overall strength and construction efficiency of the structure. Therefore, there is still much room for improvement in the existing temperature control methods.

[0005] In response to the above problems, no effective solution has been proposed in the current industry. Summary of the Invention

[0006] The present invention provides a cold joint control method for pouring concrete with different strength grades and a temperature control box for pump pipes, and forms a more efficient cold joint prevention and control solution that does not affect the strength of the concrete structure by optimizing the temperature control of the concrete and the use of admixtures.

[0007] In order to achieve the above invention purposes, the present invention provides the following technical solutions:

[0008] A temperature control box for a concrete delivery pump pipe according to the present invention, wherein the temperature control box comprises a first temperature control half box body and a second temperature control half box body which are symmetrically arranged up and down and detachably connected. Through holes adapted to the pump pipe are respectively formed at both ends of the first temperature control half box body and the second temperature control half box body. Legs are fixedly installed on the bottom surface of the second temperature control half box body. An inlet water pipe and a return pipe are respectively fixedly connected to the top surface of the first temperature control half box body and the bottom surface of the second temperature control half box body through pipe racks. A first spray pipe and a second spray pipe are respectively arranged along the whole length on the inner sides of the two. A plurality of spray heads are respectively arranged on the first spray pipe and the second spray pipe. The inlet water pipe respectively penetrates through the first temperature control half box body and the second temperature control half box body through a connecting pipe and is communicated with the first spray pipe and the second spray pipe. A drain hole is formed at the bottom of the second temperature control half box body and is connected to the return pipe through a drain pipe.

[0009] Further, a plurality of pairs of ear plates are fixedly connected to both sides of the first temperature control half box body and the second temperature control half box body correspondingly. Each pair of ear plates is fixedly connected through a fixing bolt.

[0010] Further, rubber gaskets for tightly abutting against the outer wall of the pump pipe are respectively arranged at the through holes jointly opened at both ends of the first temperature control half box body and the second temperature control half box body.

[0011] According to another aspect of the present invention, a cold joint control method for pouring concrete with different strength grades is provided, specifically as follows:

[0012] The method includes a concrete preparation process, a concrete pouring process and a maintenance monitoring process;

[0013] The concrete preparation process includes a material preparation step, a concrete mixing step and a concrete transportation step;

[0014] The concrete pouring process includes a facility preparation step, a pouring preparation step and a standard pouring step. The equipment used in this process includes a concrete mixer truck, a concrete pump truck, a pump pipe, an industrial chiller, a lifting device and the temperature control box described in the above technical solution;

[0015] The materials required in the material preparation step are fine aggregate, cold stone, cold water and additives. The concrete mixing step is immediately carried out after the material preparation step is completed, and the concrete transportation step is immediately carried out through a concrete mixer truck after the concrete mixing step is completed;

[0016] The facility preparation step includes a pump pipe installation process, a temperature control box installation process, a water pipe connection process, a pump truck debugging process and an industrial chiller debugging process; The pump pipe installation process includes installing a pump pipe at the concrete pump truck; The temperature control box installation process includes installing a plurality of temperature control boxes outside the pump pipe; The water pipe connection process includes connecting the output end of the industrial chiller to the inlet water pipe in a through manner and connecting the input end of the industrial chiller to the return pipe in a through manner;

[0017] While the concrete preparation process is in progress, the facility preparation steps can be carried out to ensure that the completion time of the facility preparation steps is earlier than before the concrete transportation process.

[0018] The pouring preparation steps include the temperature measurement process of the truck discharge and the temperature measurement process of the pump pipe discharge.

[0019] When the concrete mixer truck transports concrete to the pouring site in the concrete transportation step, the pouring preparation work is carried out: the concrete mixer truck first discharges materials, and a thermometer is used to measure the temperature. At the same time, a thermometer is used to measure the temperature of the already poured concrete. When the discharge temperature is not greater than 3 - 4 °C of the already poured concrete temperature, and the temperature is qualified, continue to discharge materials. Cold water is sprayed into the temperature control box through an industrial chiller, and the concrete is pumped through a concrete pump truck. The concrete is discharged from the pouring end of the pump pipe, and the temperature of the concrete flowing out of the pump pipe is measured again. At the same time, a thermometer is used to measure the temperature of the already poured concrete. When the temperature of the concrete flowing out of the pump pipe is 1 - 3 °C higher than the already poured concrete temperature, the temperature is qualified, and the standard pouring can be carried out; if the temperature of the concrete flowing out of the pump pipe is lower than or equal to the already poured concrete temperature, choose to increase the set temperature of the industrial chiller to increase the internal temperature of the temperature control box, thereby increasing the temperature of the pump pipe, facilitating the temperature rise of the concrete to be poured, and only when the temperature is qualified can the standard pouring be carried out.

[0020] Further, when there are multiple control boxes, the water inlet pipes of adjacent control boxes are connected through a first connecting hose in a through - connection manner, and the return pipes of adjacent control boxes are connected through a second connecting hose in a through - connection manner.

[0021] Further, the water inlet pipe is connected through a flange to the first connecting hose in a through - connection manner, and the return pipe is connected through a flange to the second connecting hose in a through - connection manner.

[0022] Further, the cold stone preparation process includes a cleaning stage, a drying stage, and a cold - making stage. The specific preparation steps are as follows:

[0023] S1. Weigh the original stone materials according to the concrete mix ratio;

[0024] S2. Ultrasonically clean the original stone materials to obtain clean original stone materials;

[0025] S3. Air - dry or blow - dry the clean original stone materials;

[0026] S4. Put the air - dried or blow - dried original stone materials into a cold storage for cold - making to obtain cold stones with a temperature not higher than 5 °C.

[0027] Further, the cold water preparation process includes an ice - adding stage and a fusion stage. The specific preparation steps are as follows:

[0028] S1. Weigh ice and municipal water according to the concrete mix ratio. The sum of the masses of ice and municipal water is equal to the total weight of water in the concrete mix ratio.

[0029] S2. Put the ice into the municipal water and stir it to make them fully blend until the ice completely melts, obtaining cold water with a temperature not higher than 5°C.

[0030] Further, the fine aggregate includes sand, cement, and fly ash, and the admixtures include water reducer and retarder. The fine aggregate and admixtures are added according to the concrete mix ratio.

[0031] Further, the method also includes: setting spliced metal formwork and wooden formwork at the joint position of concrete with different strength grades. The corresponding ends of the metal formwork and the wooden formwork are provided with matching rabbets and spliced, and a sealing gasket is installed between the rabbets of the two. The low-strength-grade concrete is poured on the side of the wooden formwork, and the high-strength-grade concrete is poured on the side of the metal formwork. A semiconductor refrigerating sheet is fixedly installed on the outer side of the metal formwork, and a plurality of slots are opened on the inner side of the metal formwork and metal rods are inserted into the slots.

[0032] Compared with the prior art, the cold joint control method for pouring concrete with different strength grades and the temperature control box for pump pipes of the present invention have the following beneficial effects:

[0033] (1). The present invention adopts the method of cooling the concrete during the concrete preparation process. When mixing the concrete, cold stones and cold water are added to reduce the hydration heat generated during the concrete mixing, so that the concrete is in a low-temperature state, avoiding the rapid solidification of the concrete caused by the hydration heat and affecting the pouring process. At the same time, when the cold stones are mixed into the concrete, they not only continuously output low temperature, facilitating the heat preservation of the concrete, but also do not affect the concrete mix ratio, facilitating the long-term maintenance of the low temperature of the concrete. The present invention utilizes the experience that it is easy for the concrete to heat up and difficult to cool down. At the beginning of pouring different concretes, the temperature of the concrete is reduced, and then according to the temperature of the already poured concrete, the temperature of the concrete to be poured is adjusted to be 1-3°C higher than the already poured concrete. In this way, the solidification speed of the already poured concrete is less than that of the concrete to be poured, achieving the purpose of simultaneous solidification and reducing the problem of cold joints caused by different solidification times, and is suitable for pouring concrete with different strength grades.

[0034] (2) The present invention uses a temperature control box, which is assembled by a first temperature control half-box and a second temperature control half-box. The pump pipe passes through the temperature control box, and cooling water is pumped into the water inlet pipe through an industrial chiller. The cooling water sprays out along the nozzle and sprays on the surface of the pump pipe, and cools the concrete through the heat conduction of the pump pipe. At the same time, by adjusting the set temperature of the industrial chiller, the temperature of the cooling water can be adjusted, which is convenient for adjusting the concrete pumping temperature, changing the concrete discharge temperature, facilitating heat preservation and temperature control. At the same time, the first temperature control half-box, the second temperature control half-box, the water inlet pipe and the return pipe are all detachable structures, which is convenient for transfer and use.

[0035] (3) The present invention adopts the method of setting metal templates at the intersection positions of concretes with different strengths. The low-strength concrete is poured on the side of the wooden formwork, and the high-strength concrete is poured on the side of the metal formwork. A semiconductor refrigerating sheet is fixedly installed on the outer wall of the metal formwork. During pouring, the semiconductor refrigerating sheet continuously outputs low temperature, and cools the metal formwork through heat conduction, and then cools the inside of the high-strength concrete through heat conduction, delaying the setting time of the previously poured high-strength concrete, ensuring the setting synchronization rate, and further reducing the generation of cold joints. At the same time, slots are opened on the top surface of the metal formwork, and metal rods are inserted inside. The metal rods extend into the concrete, playing a role in dispersing heat conduction, improving the uniformity and comprehensiveness of cooling. When removing the formwork, the metal rods are separated from the metal formwork, and the exposed metal rods can be covered during plastering, saving the serious material waste and complex pipeline layout caused by laying cooling pipelines, improving the construction efficiency, reducing the production cost, reducing the occupation of the internal space of the concrete, and improving the comprehensive utilization efficiency. Description of the Drawings

[0036] Figure 1 is the general flow chart of a cold joint control method for pouring concretes with different strength grades in an embodiment of the present invention;

[0037] Figure 2 is the process flow chart of the concrete preparation process of a cold joint control method for pouring concretes with different strength grades in an embodiment of the present invention;

[0038] Figure 3 is the process flow chart of the concrete pouring process of a cold joint control method for pouring concretes with different strength grades in an embodiment of the present invention;

[0039] Figure 4 is the working principle diagram of the temperature control box in an embodiment of the present invention;

[0040] Figure 5 is the external structure schematic diagram of the temperature control box in an embodiment of the present invention;

[0041] Figure 6 is the installation schematic diagram of the semiconductor refrigerating sheet in an embodiment of the present invention.

[0042] 1. First temperature-controlled half box body; 2. Second temperature-controlled half box body; 3. Water inlet pipe; 4. First spray pipe; 5. Sprinkler head; 6. First connecting hose; 7. Rubber gasket; 8. Flange; 9. Return pipe; 10. Second spray pipe; 11. Second connecting hose; 12. Leg; 13. Pipe rack; 14. Ear plate; 15. Fixed bolt; 16. Connecting pipe; 17. Pump pipe; 18. Drain pipe; 19. Metal formwork; 20. Wooden formwork; 21. Gasket; 22. Semiconductor refrigeration sheet; 23. Slot; 24. Metal rod. Specific implementation manner

[0043] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art belonging to the field of this disclosure. The "upper", "lower", "left", "right", "front", "rear", etc. used in the specification and claims of this patent application of the present disclosure are only used to represent relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship also changes accordingly. "Connection" or "connected" and other similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Those parts not detailed in the present invention are well-known techniques in the technical field of the present invention.

[0044] Embodiment 1:

[0045] Please refer to Figure 4-5 , a temperature control box for a concrete conveying pump pipe of the present invention, the temperature control box includes a first temperature-controlled half box body 1 and a second temperature-controlled half box body 2 that are symmetrically arranged up and down and detachably connected. Through holes adapted to the pump pipe 17 are respectively formed at both ends of the first temperature-controlled half box body 1 and the second temperature-controlled half box body 2 for assembling outside the pump pipe. Legs 12 are fixedly installed on the bottom surface of the second temperature-controlled half box body 2 for supporting the temperature control box; the water inlet pipe 3 and the return pipe 9 are respectively fixedly connected to the top surface of the first temperature-controlled half box body 1 and the bottom surface of the second temperature-controlled half box body 2 through pipe racks 13. A first spray pipe 4 and a second spray pipe 10 are respectively arranged along the entire length inside the two. A plurality of sprinkler heads 5 are respectively arranged on the first spray pipe 4 and the second spray pipe 10; the water inlet pipe 3 respectively penetrates through the first temperature-controlled half box body 1 and the second temperature-controlled half box body 2 through a connecting pipe 16 and is connected to the first spray pipe 4 and the second spray pipe 10 in communication. A drain hole is formed at the bottom of the second temperature-controlled half box body 2 and is connected to the return pipe 9 through a drain pipe 18 in a through manner.

[0046] As a preferred embodiment, a plurality of pairs of ear plates 14 are fixedly connected to both sides of the first temperature-controlled half box body 1 and the second temperature-controlled half box body 2 correspondingly, and each pair of ear plates 14 is connected and fixed by fixing bolts 15, which is convenient for disassembly, installation and maintenance.

[0047] As a preferred embodiment, rubber gaskets 7 for tightly abutting against the outer wall of the pump pipe 17 are respectively arranged at the through holes jointly opened at both ends of the first temperature-controlled half box body 1 and the second temperature-controlled half box body 2, which is convenient for installation outside the pump pipe and avoids water leakage.

[0048] Embodiment 2:

[0049] As Figure 1-6 shown, a cold joint control method for pouring concrete with different strength grades according to the present invention is specifically as follows:

[0050] This method includes a concrete preparation process, a concrete pouring process and a curing monitoring process. The curing monitoring process is a common concrete curing method in the art and will not be elaborated here;

[0051] The concrete preparation process includes a material preparation step, a concrete mixing step and a concrete transportation step;

[0052] The concrete pouring process includes a facility preparation step, a pouring preparation step and a standard pouring step. The equipment used in this process includes a concrete mixer truck, a concrete pump truck, a pump pipe, an industrial chiller, a hoisting device and the temperature control box in Embodiment 1; The hoisting device is used to hoist the output end of the pump pipe, which is a common pouring structure and will not be elaborated here;

[0053] The materials required for the material preparation step are fine aggregate, cold stones, cold water and additives. Immediately after the material preparation step is completed, the concrete mixing step is carried out, and immediately after the concrete mixing step is completed, the concrete transportation step is carried out through a concrete mixer truck;

[0054] The facility preparation step includes a pump pipe installation process, a temperature control box installation process, a water pipe connection process, a pump truck debugging process and an industrial chiller debugging process; The pump pipe installation process includes installing a pump pipe 17 at the concrete pump truck; The temperature control box installation process includes installing a plurality of temperature control boxes outside the pump pipe 17; The water pipe connection process includes connecting the output end of the industrial chiller to the water inlet pipe 3 in a through manner and connecting the input end of the industrial chiller to the return pipe 9 in a through manner. The water inlet pipe 3 and the return pipe 9 form a circulating structure to facilitate the circulation of cooling water; The industrial chiller is a common device, which is installed and placed on the construction site and is used to cool the circulating cooling water; When in use, the pump pipe passes through the temperature control box, and cooling water is pumped into the water inlet pipe 3 by the industrial chiller. The cooling water sprays out along the nozzle 5 and sprays on the surface of the pump pipe, and the temperature of the concrete is reduced through the heat conduction of the pump pipe. At the same time, by adjusting the set temperature of the industrial chiller, the temperature of the cooling water can be adjusted, so as to adjust the concrete pumping temperature, change the concrete discharge temperature, and facilitate heat preservation and temperature control;

[0055] While the concrete preparation process is in progress, the facility preparation steps can be carried out to ensure that the completion time of the facility preparation steps is earlier than before the concrete transportation process.

[0056] The pouring preparation steps include the temperature measurement process of the discharge from the tanker and the temperature measurement process of the discharge from the pump pipe.

[0057] When the concrete tanker transports concrete to the pouring site during the concrete transportation step, the pouring preparation work is carried out: the concrete tanker first discharges, and a thermometer is used to measure the temperature. At the same time, a thermometer is used to measure the temperature of the already poured concrete. When the discharge temperature is not greater than 3 - 4 °C of the already poured concrete temperature, after the temperature is qualified, continue to discharge. Cold water is sprayed into the temperature control box through an industrial chiller, and the concrete is pumped through a concrete pump truck. The concrete discharged from the pouring end of the pump pipe is measured for temperature a second time. At the same time, a thermometer is used to measure the temperature of the already poured concrete. When the temperature of the concrete flowing out of the pump pipe is 1 - 2 °C higher than the already poured concrete temperature, the temperature is qualified, and the standardized pouring is carried out. The standardized pouring means pouring according to the specifications and design requirements; if the temperature of the concrete flowing out of the pump pipe is lower than or equal to the already poured concrete temperature, choose to increase the set temperature of the industrial chiller to increase the internal temperature of the temperature control box, thereby increasing the temperature of the pump pipe to facilitate the temperature rise of the concrete to be poured until the temperature is qualified before the standardized pouring can be carried out.

[0058] As a preferred embodiment, when there are multiple control boxes, the inlet pipes 3 between adjacent control boxes are connected through the first connecting hose 6 in a through - connection manner, and the return pipes 9 between adjacent control boxes are connected through the second connecting hose 11 in a through - connection manner.

[0059] As a preferred embodiment, the inlet pipe 3 is connected through a flange 8 to the first connecting hose 6 in a through - connection manner, and the return pipe 9 is connected through a flange 8 to the second connecting hose 11 in a through - connection manner.

[0060] As a preferred embodiment, in this embodiment, the cold aggregate preparation process includes a cleaning stage, a drying stage, and a cold - making stage. The specific preparation steps are as follows:

[0061] S1. Weigh the original aggregate according to the concrete mix ratio.

[0062] S2. Ultrasonically clean the original aggregate to obtain clean original aggregate.

[0063] S3. Air - dry or blow - dry the clean original aggregate.

[0064] S4. Put the air - dried or blow - dried original aggregate into a cold storage for cold - making to obtain cold aggregate with a temperature not higher than 5 °C.

[0065] In this embodiment, as a preferred implementation manner, the cold water preparation process includes an ice addition stage and a fusion stage, and the specific preparation steps are as follows:

[0066] S1. Weigh ice and municipal water according to the concrete mix ratio, and the sum of the masses of ice and municipal water is equal to the total weight of water in the concrete mix ratio;

[0067] S2. Put the ice into the municipal water and make them fully fuse by stirring until the ice completely melts, obtaining cold water with a temperature not higher than 5°C.

[0068] The fine aggregate includes sand, cement, and fly ash, and the admixtures include water reducing agent and retarder. The fine aggregate and admixtures are added according to the concrete mix ratio.

[0069] As a preferred implementation manner, the method further includes: arranging spliced metal formwork 19 and wooden formwork 20 at the joint position of concrete with different strength grades. The corresponding ends of the metal formwork 19 and the wooden formwork 20 are provided with matching rabbets and spliced, and a gasket 21 is installed between the rabbets of the two. The low-strength grade concrete is poured on the side of the wooden formwork, and the high-strength grade concrete is poured on the side of the metal formwork. A semiconductor refrigerating sheet 22 is fixedly installed on the outer side of the metal formwork 19, and a plurality of slots 23 are opened on the inner side of the metal formwork 19 and metal rods 24 are inserted into the slots. During application, the low-strength grade concrete is poured on the side of the wooden formwork 20, and the high-strength grade concrete is poured on the side of the metal formwork 19. The semiconductor refrigerating sheet 22 is fixedly installed on the outer wall of the metal formwork 19. During pouring, the semiconductor refrigerating sheet 22 continuously outputs low temperature, cools the metal formwork 19 through heat conduction, and then cools the inside of the high-strength grade concrete through heat conduction, further delaying the setting time of the previously poured high-strength concrete, further ensuring the setting synchronization rate, further reducing the generation of cold joints. At the same time, slots 23 are opened on the top surface of the metal formwork 19, and metal rods 24 are inserted into the slots. The metal rods 24 extend into the concrete, playing a role in dispersing heat conduction, improving the uniformity and comprehensiveness of cooling. When removing the formwork, the metal rods 24 are separated from the metal formwork 19, and the exposed metal rods 24 can be covered during plastering, eliminating the serious material waste and complex pipeline layout problems caused by laying cooling pipelines, improving the construction efficiency, reducing the production cost, reducing the occupation of the internal space of the concrete, and improving the comprehensive utilization efficiency.

Claims

1. A temperature control box for concrete pump pipe, characterized in that: The temperature control box comprises a first temperature control half box (1) and a second temperature control half box (2) which are symmetrically arranged in an upper and lower manner and are detachably connected. The first temperature control half box (1) and the second temperature control half box (2) are respectively provided with through holes adapted to the pump pipe (17) at both ends. A support leg (12) is fixedly mounted on the bottom surface of the second temperature control half box (2). The top surface of the first temperature control half box (1) and the bottom surface of the second temperature control half box (2) are respectively fixedly connected to a water inlet pipe (3) and a return pipe (9) via a pipe rack (13). ), a first nozzle (4) and a second nozzle (10) are respectively provided on the inner sides of the two, and a plurality of nozzles (5) are respectively provided on the first nozzle (4) and the second nozzle (10); the water inlet pipe (3) passes through the first temperature-controlled half box (1) and the second temperature-controlled half box (2) respectively through a connecting pipe (16) and is connected to the first nozzle (4) and the second nozzle (10); a drainage hole is provided at the bottom of the second temperature-controlled half box (2) and is connected to the return pipe (9) through a drainage pipe (18).

2. A temperature control box for concrete pump pipe according to claim 1, characterized in that: A plurality of pairs of ear plates (14) are fixedly connected to both sides of the first temperature-control half box (1) and the second temperature-control half box (2), and each pair of the ear plates (14) is connected and fixed by fixing bolts (15).

3. A temperature control box for concrete pump pipe according to claim 1, characterized in that: The through holes commonly provided at both ends of the first temperature-control half box (1) and the second temperature-control half box (2) are respectively provided with rubber gaskets (7) for tightly contacting the outer wall of the pump pipe (17).

4. A cold joint control method for pouring concrete of different strength grades, characterized by: The method includes a concrete preparation process, a concrete pouring process and a maintenance monitoring process; The concrete preparation process includes a material preparation step, a concrete mixing step and a concrete transportation step; The concrete pouring process includes a facility preparation step, a pouring preparation step and a standard pouring step, and the equipment used in the process includes a concrete tank truck, a concrete pump truck, a pump pipe (17), an industrial chiller, a hoisting device and a temperature control box according to any one of claims 1 to 3; The materials required for the material preparation step are fine aggregate, cold stone, cold water and admixtures, the concrete mixing step is immediately carried out after the material preparation step is completed, and the concrete transportation step is immediately carried out by a concrete tanker after the concrete mixing step is completed; The facility preparation steps include a pump pipe installation process, a temperature control box installation process, a water pipe connection process, a pump truck debugging process and an industrial chiller debugging process; the pump pipe installation process includes installing a pump pipe (17) at the concrete pump truck; the temperature control box installation process includes installing a plurality of temperature control boxes on the outside of the pump pipe (17); the water pipe connection process includes connecting the output end of the industrial chiller with the water inlet pipe (3) and connecting the input end of the industrial chiller with the return pipe (9); While the concrete preparation process is being carried out, the facility preparation step can be carried out to ensure that the facility preparation step is completed earlier than the concrete transportation process; The pouring preparation steps include a tank truck discharge temperature measurement process and a pump pipe discharge temperature measurement process; In the concrete transportation step, when the concrete tanker transports concrete to the pouring site, pouring preparation work is carried out: the concrete tanker first discharges the material, uses a thermometer to measure the temperature, and uses the thermometer to measure the temperature of the poured concrete. When the discharge temperature is not greater than 3-4°C of the temperature of the poured concrete, the temperature is qualified, and the discharge is continued. Cold water is sprayed into the temperature control box through an industrial chiller, and concrete is pumped through a concrete pump truck. The material is discharged from the pouring end of the pump pipe, and the temperature of the concrete flowing out of the pump pipe is measured for the second time. At the same time, a thermometer is used to measure the temperature of the poured concrete. When the temperature of the concrete flowing out of the pump pipe is 1-2°C higher than the temperature of the poured concrete, the temperature is qualified and standardized pouring is carried out; if the temperature of the concrete flowing out of the pump pipe is lower than or equal to the temperature of the poured concrete, the set temperature of the industrial chiller is selected to increase, the internal temperature of the temperature control box is increased, and then the temperature of the pump pipe is increased, so as to facilitate the heating of the concrete to be poured. Standard pouring can only be carried out after the temperature is qualified.

5. A cold joint control method for pouring concrete of different strength grades according to claim 4, characterized in that: When there are multiple control boxes, the water inlet pipes (3) of adjacent control boxes are connected through a first connecting hose (6), and the return pipes (9) of adjacent control boxes are connected through a second connecting hose (11).

6. A cold joint control method for pouring concrete of different strength grades according to claim 5, characterized in that: The water inlet pipe (3) is connected to the first connecting hose (6) via a flange (8), and the return pipe (9) is connected to the second connecting hose (11) via a flange (8).

7. A cold joint control method for pouring concrete of different strength grades according to claim 4, characterized in that: The cold stone preparation process includes a cleaning stage, a drying stage and a cold preparation stage, and the specific preparation steps are: S1. Weigh the raw stone materials according to the concrete mix ratio; S2, ultrasonically cleaning the stone raw material to obtain a clean stone raw material; S3. Air-dry or blow-dry the clean stone raw materials; S4. Put the stone raw materials after airing or blowing dry into a cold storage for cold treatment to obtain cold stones with a temperature not higher than 5°C.

8. The cold joint control method for pouring concrete of different strength grades according to claim 4 is characterized in that: The cold water preparation process includes an ice adding stage and a fusion stage, and the specific preparation steps are as follows: S1. Weigh ice and municipal water according to the concrete mix ratio. The sum of the weights of ice and municipal water is equal to the total weight of water in the concrete mix ratio. S2. Add ice to municipal water and stir to fully blend it until the ice is completely melted, thereby obtaining cold water with a temperature not greater than 5°C.

9. The cold joint control method for pouring concrete of different strength grades according to claim 4, characterized in that: The fine aggregate includes sand, cement and fly ash, the admixture includes a water reducing agent and a retarder, and the fine aggregate and the admixture are added according to the concrete mix ratio.

10. The cold joint control method for pouring concrete of different strength grades according to claim 4, characterized in that: The method further comprises: arranging a spliced ​​metal template (19) and a wooden template (20) at the intersection of concretes of different strength grades, arranging matching stoppers at the corresponding ends of the metal template (19) and the wooden template (20) and splicing them, and installing a sealing gasket (21) between the stoppers of the two, pouring low-strength concrete on the wooden template side, and pouring high-strength concrete on the metal template side, fixing a semiconductor cooling plate (22) on the outer side of the metal template (19), and providing a plurality of slots (23) on the inner side of the metal template (19) and inserting a metal rod (24).

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