Concrete temperature control device for palisade crane beam
By using three rows of snake-shaped cooling water pipes and a temperature control device that monitors temperature in real time in the concrete construction of rock wall crane beams, the crack problem caused by temperature stress in concrete is solved, and a low-cost and efficient temperature control effect is achieved.
Patent Information
- Application Number
- CN202420993814.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-09
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-05-09
AI Technical Summary
During the construction of rock wall crane beams, the concrete was cracked due to temperature stress, and the existing technology temperature control measures were not effective and were costly.
Design a concrete temperature control device for rock wall crane beams, including cooling mechanism and temperature measurement monitoring mechanism. The cooling mechanism cools inside the concrete through three rows of snake-shaped cooling water pipes, and the temperature measurement and monitoring mechanism monitors the concrete temperature in real time to ensure uniform temperature distribution.
It effectively reduces the hydration heat of concrete, reduces the generation of cracks, has low material costs, good temperature control effect, and corresponding labor costs.
Smart Images
Figure CN222632871U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of concrete temperature control and crack prevention in hydraulic structure engineering, and in particular to a concrete temperature control device for crane beams on rock walls of underground caverns. Background Art
[0002] The rock wall crane beam is a beam structure that supports the operation of the bridge crane. The reinforced concrete beam is anchored on the rock wall by grouting long anchor rods. There is concrete temperature stress during the construction of the rock wall crane beam. A large number of engineering crack treatment and investigation results show that 80% to 90% of the cracks in the concrete structure are caused by the tensile stress generated by the cooling process of the concrete construction period exceeding the tensile strength of the concrete. Therefore, designing a rock wall crane beam concrete temperature control device has become a key technology for the construction of underground plant crane beams.
[0003] During the pouring and hardening of concrete, the hydration reaction of cement releases a large amount of heat. This chemical reaction causes the concentration of each component to change and causes the structure to heat up. At the same time, the increase in temperature will intensify the rate of hydration reaction. The hydration reaction will quickly raise the temperature of the concrete to 70°C. Subsequently, as the hydration rate slows down and the temperature decreases, thermal shrinkage occurs, leading to the generation of thermal stress. Driven by both chemistry and thermodynamics, the physical properties of the newly poured concrete, such as temperature, strength, stiffness, creep and shrinkage, will change significantly, which can easily lead to cracking. Concrete has poor thermal conductivity and it is difficult to dissipate it in a short time, forming a nonlinear temperature field inside. In the initial temperature rise stage, the plastic flow state and uneven temperature distribution in the concrete will not produce large tensile stress; but in the process of temperature drop, the concrete already has a certain strength, and the change in temperature field and other constraints limit the free shrinkage of the concrete, which will produce certain temperature stress. Since the surface temperature is often lower than its internal temperature, a large tensile stress will be generated on the surface of the concrete. If it exceeds the ultimate tensile strength of the concrete, surface cracks will be generated, which will further develop into through cracks after expansion.
[0004] Existing concrete anti-cracking measures are mainly concentrated in three aspects: ① Improving the anti-cracking performance of concrete from the material aspect, improving its tensile strength and ultimate tensile value, and reducing its hydration heat and shrinkage value. However, the demand for concrete materials is large, the corresponding material cost will also be high, and the performance of concrete materials is easily affected by the environment; ② Proposing reasonable structural types and sizes from the perspective of structural design, but it is easily affected by the external environment. The external environment temperature is too high or too low, resulting in low crack suppression effect of the structure, which still leads to temperature cracks; ③ Taking corresponding temperature control measures during the construction process to reduce the adverse factors that cause concrete cracking. The commonly used temperature control measure is the covering insulation method, which is easily affected by the external environment temperature and has poor temperature control effect. Manpower is also required for concrete maintenance, which increases labor costs. Utility Model Content
[0005] In order to solve the deficiencies in the prior art, the utility model patent provides a rock wall crane beam concrete temperature control device, which is helpful to solve the problem of concrete cracks during the casting process of the rock wall crane beam.
[0006] The above technical objectives of the utility model are achieved through the following technical solutions:
[0007] The utility model provides a rock wall crane beam concrete temperature control device, comprising: rock wall crane beam concrete, cooling mechanism and temperature measurement monitoring mechanism, one side of the rock wall crane beam concrete is connected to the natural surrounding rock, and the other side forms the concrete outer surface; the cooling mechanism comprises: a cooling water pipe, a water inlet branch pipe, a water inlet main pipe, a water outlet branch pipe, a water outlet main pipe, a water tank connecting pipe, a buffer water tank, a regulating water tank, a water pump, a flow control valve, a main pipe electromagnetic flowmeter, a branch pipe flow control valve and a branch pipe electromagnetic flowmeter; wherein the cooling water pipe is arranged in three rows and is serpentinely installed inside the concrete crane beam, and the cooling water pipe is arranged in three rows and ... The water inlet pipe at one end of the water pipe is connected to the water inlet branch pipe, which is connected to the water inlet main pipe; the water outlet pipe at the other end of the cooling water pipe is connected to the water outlet branch pipe, which is connected to the water outlet main pipe, the water inlet main pipe is connected to the buffer water tank through a water pump, and the water outlet main pipe is connected to the regulating water tank through a water pump; the temperature measurement and monitoring mechanism includes: a heater, a refrigerator, a temperature monitor, a temperature sensor, a surface thermometer and a cross-sectional monitoring section; wherein the surface thermometer is arranged on the upper surface of the concrete at the cross-sectional monitoring section, and the heater, the temperature sensor, the temperature monitor and the refrigerator are arranged in the water tank.
[0008] Preferably, the water inlet and outlet of the cooling water pipe are both located on the upper part of the concrete pouring surface of the rock wall crane beam concrete.
[0009] Preferably, the water outlet pipe and the water inlet pipe of the cooling water pipe can be detachably connected via a connecting assembly.
[0010] Preferably, a total flow control valve and a main pipe electromagnetic flowmeter are installed next to the water pump connected to the water inlet main pipe.
[0011] Preferably, the connection points between the water inlet branch pipe and the three rows of cooling water pipes are provided with branch pipe flow control valves and branch pipe electromagnetic flow meters, wherein the branch pipe flow control valves can be opened simultaneously.
[0012] Preferably, the cross-sectional monitoring sections are arranged in the middle and at both ends of the rock wall crane beam, a surface thermometer is arranged on the concrete upper surface of each cross-sectional monitoring section, and four monitoring key points are selected to set up monitoring blocks, the four monitoring key points include: a first monitoring key point, a second monitoring key point, a third monitoring key point and a fourth monitoring key point; temperature sensors are respectively arranged at the four monitoring key points.
[0013] Preferably, the first monitoring key point is the upper end point of the interface between the rock wall crane beam and the cavern surrounding rock, the second monitoring key point is the middle end point of the interface between the rock wall crane beam and the cavern surrounding rock, the third monitoring key point is the lower end point of the interface between the rock wall crane beam and the cavern surrounding rock, and the fourth monitoring key point is the center point of the rock wall crane beam.
[0014] Preferably, the buffer water tank and the regulating water tank are connected via a water tank connecting pipe.
[0015] Preferably, a heater, a temperature sensor and a temperature monitor are provided in the buffer water tank.
[0016] Preferably, a heater, a temperature sensor, a temperature monitor and a refrigerator are arranged in the regulating water tank.
[0017] The beneficial effects of the utility model are that, compared with the prior art, the hydration heat of concrete can be reduced without changing the properties of the concrete, and the material cost is low; the temperature of the concrete is changed from the inside, and it is not easily affected by the external environment; compared with the traditional covering insulation method, the device is more automated, the temperature control effect is good, and the labor cost is low.
[0018] Three parallel serpentine cooling water pipes are inserted into the concrete of the rock wall crane beam to evenly dissipate the heat during the cooling process of the concrete. At the same time, it has been verified that this water pipe arrangement has a better cooling effect. The general underground cavern construction environment is around 28°C. The two-phase water flow time can not only reduce the temperature in the early stage of pouring, but also prevent the water temperature from being too low to cause large temperature stress in the later stage of pouring.
[0019] If a general one-layer serpentine cooling water pipe arrangement is blocked or fails, it will make the concrete temperature difficult to control. However, the arrangement provided by the utility model can rely on the remaining cooling water pipes to work when one cooling water pipe fails, and the inlet and outlet water connecting pipes are easy to disassemble and can be repaired in a short time, reducing the damage caused by temperature stress.
[0020] The temperature of key points is monitored at multiple sections and compared with the concrete surface temperature. Real-time monitoring is performed to effectively control the temperature difference between inside and outside to within 20°C. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is a schematic diagram of the layout of the concrete temperature control device for the rock wall crane beam of the utility model;
[0022] Figure 2 This is a schematic diagram of the cross-sectional monitoring section of the concrete of the rock wall crane beam of the utility model;
[0023] Figure 3 This is a schematic diagram of the arrangement of concrete cooling water pipes for rock wall crane beams of the utility model;
[0024] Figure 4It is a schematic diagram of the arrangement of flow control valve, main pipe electromagnetic flow meter and branch pipe flow control valve;
[0025] In the figure: 1. Rock wall crane beam concrete; 2. Cooling mechanism; 2-1. Cooling water pipe; 2-2. Water inlet branch pipe; 2-3. Water inlet main pipe; 2-4. Water outlet branch pipe; 2-5. Water outlet main pipe; 2-6. Water tank connecting pipe; 2-7. Buffer water tank; 2-8. Regulating water tank; 2-9. Water pump; 2-10. Flow control valve; 2-11. Main pipe electromagnetic flowmeter; 2-12. Branch pipe flow control valve; 2-13. Branch pipe electromagnetic flowmeter; 2. Temperature measurement and monitoring mechanism; 3-1. Heater; 3-2. Refrigerator; 3-3. Temperature sensor; 3-4. Temperature monitor; 3-5. Surface thermometer; 3-6. Cross-sectional monitoring section; NO1. First monitoring key point; NO2. Second monitoring key point; NO3. Third monitoring key point; NO4. Fourth monitoring key point. DETAILED DESCRIPTION
[0026] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The embodiments described in this application are only part of the embodiments of the utility model, not all of them. Based on the spirit of the utility model, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the utility model.
[0027] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.
[0028] like Figure 1 and Figure 4 As shown, this embodiment provides a rock wall crane beam concrete temperature control device, which includes a rock wall crane beam concrete 1, a cooling mechanism 2, and a temperature measurement and monitoring mechanism 3.
[0029] One side of the long side of the concrete rock wall crane beam 1 is connected to the natural surrounding rock, and the other side forms a concrete outer surface.
[0030] The cooling mechanism 2 is used for conveying and regulating cooling water, controlling the temperature of concrete, and inhibiting the occurrence of concrete cracks. It includes a cooling water pipe 2-1, a water inlet branch pipe 2-2, a water inlet main pipe 2-3, a water outlet branch pipe 2-4, a water outlet main pipe 2-5, a water tank connecting pipe 2-6, a buffer water tank 2-7, a regulating water tank 2-8, a water pump 2-9, a flow control valve 2-10, a main pipe electromagnetic flowmeter 2-11, a branch pipe flow control valve 2-12 and a branch pipe electromagnetic flowmeter 2-13; wherein the cooling water pipe 2-1 is arranged in three parallel rows and serpentinely installed inside the rock wall crane beam concrete 1, using a steel pipe with a diameter of 28 mm and a wall thickness of 3 mm. The water inlet pipe at one end of the cooling water pipe 2-1 is vertically connected to the water inlet branch pipe 2-2. The connection between the water inlet branch pipe 2-2 and the cooling water pipe 2-1 is provided with a branch pipe flow control valve 2-12 and a branch pipe electromagnetic flow meter 2-13. The water inlet branch pipes 2-2 are connected to the water inlet main pipe 2-3 at one point. The water inlet main pipe 2-3 is connected to the buffer water tank 2-7 through a pump 2-9. The flow control valve 2-10 and the main pipe electromagnetic flow meter 2-1 are provided next to the pump 2-9. The water outlet pipe at the other end of the cooling water pipe 2-1 is vertically connected to the water outlet branch pipe 2-4. The water outlet branch pipes 2-4 are connected to the water outlet main pipe 2-5 at one point. The water outlet main pipe 2-5 is connected to the regulating water tank 2-8 through a pump 2-9. The regulating water tank 2-8 and the buffer water tank 2-7 are connected via a water tank connecting pipe 2-6, and the water inlet pipe and the water outlet pipe are both located on the upper part of the concrete pouring surface of the rock wall crane beam concrete 1 and can be detachably connected via a connecting assembly.
[0031] The temperature measurement and monitoring mechanism 3 is used to monitor the temperature change of the rock wall crane beam concrete 1, including a heater 3-1, a refrigerator 3-2, a temperature monitor 3-4, a temperature sensor 3-3, a surface thermometer 3-5 and a cross-sectional monitoring section 3-6; wherein the buffer water tank 2-7 contains a heater 3-1, a temperature sensor 3-3 and a temperature monitor 3-4, so that the inlet water temperature is controlled at a set temperature. The regulating water tank 2-8 contains a refrigerator 3-2, a heater 3-1, a temperature sensor 3-3 and a temperature monitor 3-4, which can adjust the water temperature according to the needs of two different water flow temperatures. Figure 1 and Figure 3 As shown, the horizontal distance between the front and rear of three adjacent cooling water pipes 2-1 is 0.45m. The horizontal distance between the left and right water pipes of the cooling water pipe 2-1 and the edge of the concrete 1 of the rock wall crane beam is 0.3m. The vertical distance between the upper and lower water pipes of the serpentine cooling water pipe 2-1 near the free surface is 0.5m, the vertical distance between the upper and lower water pipes of the middle row of cooling water pipes 2-1 is 0.6m, and the vertical distance between the upper and lower water pipes of the row of cooling water pipes 2-1 near the surrounding rock is 0.4m.
[0032] like Figure 1 and Figure 2As shown, the cross-sectional monitoring section 3-6 is arranged in the middle and both ends of the rock wall crane beam concrete 1, a surface thermometer 3-5 is arranged on the upper surface of the concrete of each cross-sectional monitoring section 3-6, and four key monitoring points of the rock wall crane beam concrete 1 are selected to set monitoring blocks, the four key monitoring points include: the first key monitoring point NO1, the second key monitoring point NO2, the third key monitoring point NO3 and the fourth key monitoring point NO4; the four key monitoring points are respectively provided with temperature sensors 3-3; wherein the first key monitoring point NO1 is the upper end point of the interface between the rock wall crane beam and the cavern surrounding rock, the second key monitoring point NO2 is the middle end point of the interface between the rock wall crane beam and the cavern surrounding rock, the third key monitoring point NO3 is the lower end point of the interface between the rock wall crane beam and the cavern surrounding rock, the fourth key monitoring point NO4 is the center point of the rock wall crane beam, and the contact position between the rock wall crane beam and the crane beam rail and the beam center are all key monitoring points. The surface thermometers are all equipped with automatic temperature monitoring and recording functions, with data collected every half an hour to monitor the temperature changes inside and outside the concrete in real time. Without cooling water, the internal temperature of the concrete can reach up to 52°C. After cooling water is introduced, the thermometer monitoring data shows that the maximum internal temperature of the concrete is 36°C, and the temperature in most areas is below 30°C, effectively reducing the temperature stress caused by concrete pouring.
[0033] The beneficial effect of the utility model is that, compared with the prior art, the hydration heat of concrete can be reduced without changing the properties of the concrete, so the material cost is low, and the temperature of the concrete is changed from the inside, which is not easily affected by the external environment. Compared with the traditional covering insulation method, the device is more automated and the labor cost is low.
[0034] Moreover, if a common arrangement of a layer of serpentine cooling water pipes 2-1 is blocked or fails, it will make it difficult to control the temperature of the concrete. However, the arrangement provided by the utility model has three parallel rows of serpentine cooling water pipes 2-1 inserted into the concrete of the rock wall crane beam, so that when one cooling water pipe 2-1 fails, the remaining cooling water pipes can be relied on to work, and the inlet and outlet water connection pipes are easy to disassemble and can be repaired in a short time, reducing the damage caused by temperature stress. At the same time, after calculation and demonstration, this water pipe arrangement method has a better cooling effect.
[0035] The two-phase water flow time can not only reduce the temperature in the early stage of pouring, but also prevent the water temperature from being too low to cause large temperature stress in the later stage of pouring. The temperature of key points is monitored at multiple sections to form a contrast with the surface temperature of the concrete, and the temperature difference between the inside and outside is controlled within 20℃ to prevent the temperature difference between the inside and outside of the concrete from being too large, which may cause temperature cracks.
[0036] The specific implementation methods described above further describe the utility model purpose, technical solutions, and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific implementation method of the utility model and is not intended to limit the protection scope of the utility model. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A rock wall crane beam concrete temperature control device, comprising: Rock wall crane beam concrete (1), cooling mechanism (2) and temperature measurement monitoring mechanism (3), characterized in that: One side of the rock wall crane beam concrete (1) is connected to the natural surrounding rock, and the other side forms a concrete outer surface; The cooling mechanism (2) comprises: a cooling water pipe (2-1), a water inlet branch pipe (2-2), a water inlet main pipe (2-3), a water outlet branch pipe (2-4), a water outlet main pipe (2-5), a water tank connecting pipe (2-6), a buffer water tank (2-7), a regulating water tank (2-8), a water pump (2-9), a flow control valve (2-10), a main pipe electromagnetic flow meter (2-11), a branch pipe flow control valve (2-12) and a branch pipe electromagnetic flow meter (2-13); wherein the cooling water pipe (2-1) is arranged in three rows and in a serpentine shape. Installed inside the concrete crane beam, the water inlet pipe at one end of the cooling water pipe (2-1) is connected to the water inlet branch pipe (2-2), and the water inlet branch pipe (2-2) is connected to the water inlet main pipe (2-3); the water outlet pipe at the other end of the cooling water pipe (2-1) is connected to the water outlet branch pipe (2-4), and the water outlet branch pipe (2-4) is connected to the water outlet main pipe (2-5), the water inlet main pipe (2-3) is connected to the buffer water tank (2-7) through a pump (2-9), and the water outlet main pipe (2-5) is connected to the regulating water tank (2-8) through a pump (2-9); The temperature measurement and monitoring mechanism (3) comprises: a heater (3-1), a refrigerator (3-2), a temperature sensor (3-3), a temperature monitor (3-4), a surface thermometer (3-5) and a cross-sectional monitoring section (3-6); wherein the surface thermometer (3-5) is arranged on the upper surface of the concrete at the cross-sectional monitoring section (3-6), and the heater (3-1), the refrigerator (3-2), the temperature sensor (3-3) and the temperature monitor (3-4) are arranged in a water tank.
2. A rock wall crane beam concrete temperature control device according to claim 1, characterized in that: The water inlet and outlet of the cooling water pipe (2-1) are both located on the upper part of the concrete pouring surface of the rock wall crane beam concrete (1).
3. A rock wall crane beam concrete temperature control device according to claim 1, characterized in that: The water outlet pipe and the water inlet pipe of the cooling water pipe (2-1) can be detachably connected via a connecting assembly.
4. A rock wall crane beam concrete temperature control device according to claim 1, characterized in that: A flow control valve (2-10) and a main pipe electromagnetic flow meter (2-11) are installed beside the water pump (2-9) connected to the water inlet main pipe (2-3).
5. The rock wall crane beam concrete temperature control device according to claim 1, characterized in that: A branch pipe flow control valve (2-12) and a branch pipe electromagnetic flow meter (2-13) are provided at the connection points between the water inlet branch pipe (2-2) and the three rows of cooling water pipes (2-1), wherein the branch pipe flow control valves (2-12) can be opened at the same time.
6. A rock wall crane beam concrete temperature control device according to claim 1, characterized in that: The cross-sectional monitoring sections (3-6) are arranged in the middle and at both ends of the rock wall crane beam, a surface thermometer (3-5) is arranged on the concrete upper surface of each cross-sectional monitoring section (3-6), and four key monitoring points are selected to set up monitoring blocks, the four key monitoring points include: a first key monitoring point (NO1), a second key monitoring point (NO2), a third key monitoring point (NO3) and a fourth key monitoring point (NO4); and temperature sensors (3-3) are respectively arranged at the four key monitoring points.
7. A rock wall crane beam concrete temperature control device according to claim 6, characterized in that: The first monitoring key point (NO1) is the upper end point of the interface between the rock wall crane beam and the cavern surrounding rock, the second monitoring key point (NO2) is the middle end point of the interface between the rock wall crane beam and the cavern surrounding rock, the third monitoring key point (NO3) is the lower end point of the interface between the rock wall crane beam and the cavern surrounding rock, and the fourth monitoring key point (NO4) is the center point of the rock wall crane beam.
8. The rock wall crane beam concrete temperature control device according to claim 1, characterized in that: The buffer water tank (2-7) and the regulating water tank (2-8) are connected via a water tank connecting pipe (2-6).
9. A rock wall crane beam concrete temperature control device according to claim 1, characterized in that: A heater (3-1), a temperature sensor (3-3) and a temperature monitor (3-4) are arranged in the buffer water tank (2-7).
10. The rock wall crane beam concrete temperature control device according to claim 1, characterized in that: A heater (3-1), a temperature sensor (3-3), a temperature monitor (3-4) and a refrigerator (3-2) are arranged in the regulating water tank (2-8).