Low-pressure water circulation system for cooling and crack resistance of mass concrete

Abstract

The low-pressure water circulation system comprises a water tank, a water pump and a water segregator, a water inlet of the water tank is communicated with an external municipal water supply port through a water receiving pipe, and a water outlet of the water tank is communicated with a water inlet of the water pump through a water receiving pipe. A water outlet of the water pump is communicated with a water inlet of the water segregator through a water receiving pipe, a plurality of water outlets of the water segregator are respectively connected with cooling water pipes, the cooling water pipes are arranged in the shear wall and the top plate and are arranged in a snake shape along the interior of the shear wall and the interior of the top plate, and all the cooling water pipes are communicated with the water tank through the water receiving pipe; a plurality of temperature measuring units for measuring the temperature difference change of the interior and the inner surface of the concrete are embedded in the shear wall and the top plate; heat generated by hydration heat in large concrete is reduced through circulating cooling water, the temperature difference between the interior and the inner surface of the large-volume concrete can be effectively controlled, and generation of through type cracks on the surface of the concrete is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of water circulation systems for building construction, and particularly relates to a low-pressure water circulation system for cooling and crack resistance of large-volume concrete. Background Art

[0002] In construction, some large-volume concrete projects with extra-thick walls and slabs will have an internal temperature that is too high during the pouring process, resulting in a large temperature difference between the inside and the outside. If the interior of the cast large-volume concrete is not cooled down in time, after the concrete is solidified, through cracks will appear on the surface of the concrete, and the quality will not meet the standards, making it difficult to meet the large-volume concrete construction standards. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide a low-pressure water circulation system for cooling and cracking resistance of large-volume concrete, which can effectively control the temperature difference between the interior and the surface of large-volume concrete and reduce the generation of surface and through-type cracks in the concrete.

[0004] The purpose of the utility model is achieved through the following technical scheme. The low-pressure water circulation system for cooling and cracking large-volume concrete includes a water tank, a water pump and a water distributor. The water inlet of the water tank is connected to the external municipal water supply through a water connecting pipe, the water outlet of the water tank is connected to the water inlet of the water pump through a water connecting pipe, the water outlet of the water pump is connected to the water inlet of the water distributor through a water connecting pipe, and the water outlet of the water distributor is provided with a plurality of cooling water pipes respectively connected to the water outlet of the water distributor. The cooling water pipes are arranged in the shear wall and the top plate, and are arranged in a serpentine shape along the inside of the shear wall and the top plate. All the cooling water pipes are connected to the water tank through the water connecting pipe, and a plurality of temperature measuring units for measuring the temperature difference between the inside and the inside of the concrete are buried in the shear wall and the top plate.

[0005] The beneficial effects of the utility model are as follows: compared with the prior art, by setting a water tank, a water pump and a water distributor, and arranging the cooling water pipes in a serpentine manner inside the shear wall and the top plate, and burying a temperature measuring unit inside, the heat generated by the hydration heat in the large concrete is reduced by circulating cooling water, and the temperature difference between the inside and outside of the concrete is controlled to meet the large-volume concrete construction standards. It can effectively control the temperature difference between the inside and the inside surface of the large-volume concrete and reduce the generation of surface and through-type cracks in the concrete.

[0006] Preferably, a solenoid valve for controlling the water inlet flow is installed on the cooling water pipe, and the solenoid valve is located at the water outlet of the water distributor; in this way, the water inlet flow of each cooling water pipe can be controlled, and the temperature difference between the inside and outside of the concrete can be adjusted in time by the water flow rate.

[0007] Preferably, a safety drain valve for controlling the water flow rate is installed between the cooling water pipe and the water receiving pipe; this can ensure the control of the water flow rate in the later stage, and when the internal temperature of the concrete is high, the water flow rate is appropriately increased to reduce the temperature difference between the inner and outer surfaces.

[0008] Preferably, each of the shear walls is provided with a cooling water pipe, and the cooling water pipes are arranged in a serpentine shape along the left and right sides of the shear wall, and the water inlet end of the cooling water pipe is located on one side of the shear wall, and the water outlet end of the cooling water pipe is located on the other side of the shear wall; in this way, the arrangement of the cooling water pipes covers the entire shear wall as much as possible, and the serpentine arrangement of the cooling water pipes can more effectively reduce the internal temperature of the concrete.

[0009] Preferably, the spacing between the cooling water pipe and the left and right sides of the shear wall is 90 cm, the spacing between the cooling water pipe and the upper and lower sides of the shear wall is 60 cm, and the cooling water pipe is arranged at the center of the front and rear sides of the shear wall; in this way, the temperature difference between the inside and the inside surface of the large volume concrete can be controlled as much as possible within the standard temperature control range of the construction.

[0010] Preferably, at least two cooling water pipes are provided inside each of the top plates, each of the cooling water pipes is arranged in a serpentine shape along the front and rear sides of the top plate, and adjacent cooling water pipes are arranged along the left and right sides of the top plate; the water inlet end of the cooling water pipe is located at the end of the cooling water pipe arranged in a serpentine shape, the water outlet end of the cooling water pipe is located at the end of the cooling water pipe arranged in a straight pipe shape, and the cooling water pipe arranged in a straight pipe shape is located on one side of the cooling water pipe arranged in a serpentine shape; in this way, the arrangement of the cooling water pipes covers the entire top plate as much as possible, and the internal temperature of the concrete can be more effectively reduced through the cooling water pipes arranged in a serpentine shape.

[0011] Preferably, the cooling water pipes are distributed at equal intervals along the upper and lower sides of the top plate, and the spacing between the upper and lower adjacent cooling water pipes is 1.5m; when the top plate thickness exceeds 3m, the above-mentioned arrangement of cooling water pipes can more effectively reduce the internal temperature of the concrete.

[0012] Preferably, the spacing between the cooling water pipe and the left and right sides and the front and back sides of the top plate is 70 cm, and the spacing between the cooling water pipe and the upper and lower sides of the top plate is 60 to 90 cm; in this way, the temperature difference between the inside and the inside surface of the large volume concrete can be controlled as much as possible within the construction standard temperature control range.

[0013] Preferably, the temperature measuring unit comprises a temperature measuring pipeline and a temperature measuring sensor head, the temperature measuring sensor head is communicatively connected to the temperature measuring pipeline, and the temperature measuring pipeline is communicatively connected to the electronic temperature measuring instrument; the front and rear sides of the shear wall are provided with temperature measuring sensors distributed in the upper, middle and lower directions, and the left and right sides and the upper and lower sides of the shear wall are provided with temperature measuring sensors distributed in an oblique direction; the upper and lower sides of the top plate are provided with temperature measuring sensors distributed in the upper, middle and lower directions, and the left and right sides and the front and rear sides of the top plate are provided with temperature measuring sensors distributed in an oblique direction; through the arrangement of the above-mentioned structure, the temperature of the concrete poured inside the concrete can be accurately measured, and the temperature rise inside the concrete can be ensured to be no more than 45°C and the temperature difference between the inside and the outside is no more than 25°C by adjusting the cooling circulating water flow rate.

[0014] Preferably, the temperature measuring unit and the cooling water pipe are both fixed to the steel frame inside the concrete by steel wire; this ensures that the temperature measuring unit and the cooling water pipe will not be displaced when the concrete is poured, thereby ensuring smooth water circulation and accurate temperature control detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the framework structure of the low-pressure water circulation system of the utility model.

[0016] Figure 2 It is a structural schematic diagram of a cooling water pipe and a temperature measuring unit on a shear wall of the utility model.

[0017] Figure 3 It is a structural schematic diagram of the cooling water pipe and the temperature measuring unit on the top plate of the utility model.

[0018] Figure 4 It is a schematic diagram of the upper, middle and lower distribution structure of the temperature measuring unit of the utility model on the shear wall and the top plate.

[0019] The numbers in the attached drawings are: 1. water tank; 2. water pump; 3. water distributor; 4. water connecting pipe; 5. steel frame; 6. cooling water pipe; 7. shear wall; 8. top plate; 9. temperature measuring unit; 10. solenoid valve; 11. safety drain valve; 91. temperature measuring pipeline; 92. temperature measuring sensor head. DETAILED DESCRIPTION

[0020] The following is a detailed introduction to the utility model in conjunction with the accompanying drawings: Figures 1 to 4As shown, the utility model includes a water tank 1, a water pump 2 and a water distributor 3. The water inlet of the water tank 1 is connected to the external municipal water supply port through a water connection pipe 4. The water outlet of the water tank 1 is connected to the water inlet of the water pump 2 through the water connection pipe 4. The water outlet of the water pump 2 is connected to the water inlet of the water distributor 3 through the water connection pipe 4. The water outlet of the water distributor 3 is provided with several cooling water pipes 6 respectively connected. The cooling water pipes 6 are arranged in the shear wall 7 and the top plate 8, and are arranged in a serpentine shape along the inside of the shear wall 7 and the top plate 8. All cooling water pipes 6 are connected to the water tank 1 through the water connection pipe 4. Several temperature measuring units 9 for measuring the temperature difference between the inside and the inside surface of the concrete are buried inside the shear wall 7 and the top plate 8. Before pouring the mass concrete, the lines of the cooling water pipes 6 inside the mass concrete are reasonably arranged in combination with the construction drawings. During the concrete pouring and curing process, the pressure of the low-pressure circulating water is adjusted according to the temperature data measured at the temperature measuring point of the temperature measuring unit 9, and the cooling circulating water is controlled to the optimal flow rate to achieve the best cooling effect. The cooling water flows from the water inlet through the water tank 1 into the water receiving pipe 4, and after being pressurized by the water pump 2, it flows out from each water outlet through the water distributor 3, and then cools the inside of the concrete through the cooling water pipe 6, and finally gathers in the water tank 1. After a series of cooling, a new round of cooling water circulation begins. The water pump 2 mentioned above is a variable frequency water pump. A water pump 2 is set in the same partition water pipe, and several cooling water pipes 6 are connected by the water distributor 3. The head of the water pump 2 is 20m and 25m. 3 / h.

[0021] The cooling water pipe 6 is provided with a solenoid valve 10 for controlling the water inlet flow rate, and the solenoid valve 10 is located at the water outlet of the water distributor 3. A safety drain valve 11 for controlling the water flow rate is installed between the cooling water pipe 6 and the water receiving pipe 4. The cooling water pipe 6 is a welded steel pipe for low-pressure fluid transportation with an inner diameter of 25 mm and a wall thickness of 1.6 mm.

[0022] A cooling water pipe 6 is provided inside each shear wall 7. The cooling water pipes 6 are arranged in a serpentine shape along the left and right sides of the shear wall 7 with a spacing of 1.2m. The water inlet end of the cooling water pipe 6 is located on one side of the shear wall 7, and the water outlet end of the cooling water pipe 6 is located on the other side of the shear wall 7.

[0023] The distance between the cooling water pipe 6 and the left and right sides of the shear wall 7 is 90 cm, the distance between the cooling water pipe 6 and the upper and lower sides of the shear wall 7 is 60 cm, and the cooling water pipe 6 is arranged at the center of the front and rear sides of the shear wall 7.

[0024] At least two cooling water pipes 6 are provided inside each top plate 8, and each cooling water pipe 6 is arranged in a serpentine shape along the front and rear sides of the top plate 8, with a spacing of 1.2 m, and adjacent cooling water pipes 6 are arranged along the left and right sides of the top plate 8; the water inlet end of the cooling water pipe 6 is located at the end of the cooling water pipe arranged in a serpentine shape, the water outlet end of the cooling water pipe 6 is located at the end of the cooling water pipe arranged in a straight tube, and the cooling water pipe 6 arranged in a straight tube is located on one side of the cooling water pipe 6 arranged in a serpentine shape.

[0025] The cooling water pipes 6 are distributed at equal intervals along the upper and lower sides of the top plate 8, and the interval between the upper and lower adjacent cooling water pipes 6 is 1.5 m.

[0026] The distance between the cooling water pipe 6 and the left and right sides and the front and rear sides of the top plate 8 is 70 cm, and the distance between the cooling water pipe 6 and the upper and lower sides of the top plate 8 is 60 to 90 cm.

[0027] The 1.8m thick top plate 8 is equipped with 3 independent water pipes, all of which are fed from serpentine pipes and discharged from straight pipes, so that the heated cooling water can flow out to the water tank as quickly as possible and enter the next round of water circulation. The cooling water pipe is 70cm away from the concrete on both sides and 90cm away from the upper and lower concrete. The horizontal length of the single-loop water pipe is 6.7m, and the total loop length is 103m.

[0028] The top plate 8 is 3m thick, and two independent water pipes are set on the upper layer, both of which are fed from the serpentine pipe and discharged from the straight pipe. The cooling water pipe is 70cm away from the concrete on both sides and 60cm away from the upper and lower concrete. The horizontal length of the single loop water pipe is 3m, and the total length of the loop is 42.3m.

[0029] Arrangement in the vertical direction: one layer of cooling water pipes is set in the 1.8m thick plate area, and the distance between the water pipe plane and the bottom relative elevation -5.0 is 0.9m; two layers of cooling water pipes are set in the 3m thick plate area, and the distances between the first and second layers of water pipe planes and the bottom are 0.9 and 2.4mm respectively.

[0030] The temperature measuring unit 9 includes a temperature measuring pipeline 91 and a temperature measuring sensor head 92, the temperature measuring sensor head 92 is communicatively connected to the temperature measuring pipeline 91, and the temperature measuring pipeline 91 is communicatively connected to the electronic temperature measuring instrument; the temperature measuring sensor heads 92 are arranged in an upper, middle and lower distribution on the front and rear sides of the shear wall 7, and the temperature measuring sensor heads 92 are obliquely distributed on the left and right sides and the upper and lower sides of the shear wall 7; the temperature measuring sensor heads 92 are arranged in an upper, middle and lower distribution on the upper and lower sides of the top plate 8, and the temperature measuring sensor heads 92 are obliquely distributed on the left and right sides and the front and rear sides of the top plate 8.

[0031] Use electronic temperature measuring instruments and large-volume concrete temperature measuring record sheets to record the temperature difference changes inside and outside the concrete during pouring and curing. According to the measured temperature, adjust the cooling circulating water flow rate to ensure that the temperature rise inside the concrete is not greater than 45°C and the temperature difference between the inside and outside is not greater than 25°C. Record the temperature changes after cooling. Statistically analyze the data to obtain the water flow rate with the highest cooling efficiency. The circulating water flows out from the outlet and collects in water tank 1. Use an electronic temperature measuring instrument to measure and record the outlet temperature. If the outlet temperature is high, the circulating water flow rate can be appropriately increased to control the temperature rise inside the concrete to not greater than 45°C and the temperature difference between the inside and outside to not greater than 25°C. Take cooling measures for the reservoir, such as adding ice cubes.

[0032] The temperature measuring unit 9 and the cooling water pipe 6 are both tied and fixed to the steel bar frame 5 inside the concrete through steel wires.

[0033] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A low-pressure water circulation system for cooling and cracking resistance of large-volume concrete, comprising a water tank (1), a water pump (2) and a water distributor (3), characterized in that: The water inlet of the water tank (1) is connected to the external municipal water supply through a water connection pipe (4); the water outlet of the water tank (1) is connected to the water inlet of the water pump (2) through a water connection pipe (4); the water outlet of the water pump (2) is connected to the water inlet of the water distributor (3) through a water connection pipe (4); the water outlet of the water distributor (3) is provided with a plurality of cooling water pipes (6) respectively connected thereto; the cooling water pipes (6) are arranged inside the shear wall (7) and the top plate (8) and are arranged in a serpentine shape along the inside of the shear wall (7) and the top plate (8); all the cooling water pipes (6) are connected to the water tank (1) through the water connection pipe (4); a plurality of temperature measuring units (9) for measuring the temperature difference between the inside and the inside surface of the concrete are buried inside the shear wall (7) and the top plate (8).

2. The low-pressure water circulation system for cooling and cracking resistance of large-volume concrete according to claim 1 is characterized in that: The cooling water pipe (6) is provided with a solenoid valve (10) for controlling the water inlet flow rate, and the solenoid valve (10) is located at the water outlet of the water distributor (3).

3. The low-pressure water circulation system for cooling and cracking resistance of large-volume concrete according to claim 1 is characterized in that: A safety drain valve (11) for controlling the water flow rate is installed between the cooling water pipe (6) and the water receiving pipe (4).

4. The low-pressure water circulation system for cooling and cracking resistance of large-volume concrete according to claim 1 is characterized in that: A cooling water pipe (6) is provided inside each of the shear walls (7), and the cooling water pipe (6) is arranged in a serpentine shape along the left and right sides of the shear wall (7), and the water inlet end of the cooling water pipe (6) is located on one side of the shear wall (7), and the water outlet end of the cooling water pipe (6) is located on the other side of the shear wall (7).

5. The low-pressure water circulation system for cooling and cracking resistance of large-volume concrete according to claim 4 is characterized in that: The distance between the cooling water pipe (6) and the left and right sides of the shear wall (7) is 90 cm, the distance between the cooling water pipe (6) and the upper and lower sides of the shear wall (7) is 60 cm, and the cooling water pipe (6) is arranged at the center of the front and rear sides of the shear wall (7).

6. The low-pressure water circulation system for cooling and cracking resistance of large-volume concrete according to claim 1 is characterized in that: Each of the top plates (8) is provided with at least two cooling water pipes (6), each of the cooling water pipes (6) is arranged in a serpentine shape along the front and rear sides of the top plate (8), and adjacent cooling water pipes (6) are arranged along the left and right sides of the top plate (8); the water inlet end of the cooling water pipe (6) is located at the end of the cooling water pipe arranged in a serpentine shape, the water outlet end of the cooling water pipe (6) is located at the end of the cooling water pipe arranged in a straight tube shape, and the cooling water pipe (6) arranged in a straight tube shape is located on one side of the cooling water pipe (6) arranged in a serpentine shape.

7. The low-pressure water circulation system for cooling and cracking resistance of large-volume concrete according to claim 6 is characterized in that: The cooling water pipes (6) are distributed at equal intervals along the upper and lower sides of the top plate (8), and the spacing between the upper and lower adjacent cooling water pipes (6) is 1.5 m.

8. The low-pressure water circulation system for cooling and cracking resistance of large-volume concrete according to claim 7 is characterized in that: The distance between the cooling water pipe (6) and the left and right sides and the front and rear sides of the top plate (8) is 70 cm, and the distance between the cooling water pipe (6) and the upper and lower sides of the top plate (8) is 60 to 90 cm.

9. The low-pressure water circulation system for cooling and cracking resistance of large-volume concrete according to claim 1 is characterized in that: The temperature measuring unit (9) comprises a temperature measuring pipeline (91) and a temperature measuring induction head (92); the temperature measuring induction head (92) is communicatively connected to the temperature measuring pipeline (91); and the temperature measuring pipeline (91) is communicatively connected to an electronic temperature measuring instrument; the temperature measuring induction heads (92) are arranged in an upper, middle and lower distribution in the front and rear directions of the shear wall (7); the temperature measuring induction heads (92) are arranged in an oblique distribution in the left and right sides and the upper and lower sides of the shear wall (7); the temperature measuring induction heads (92) are arranged in an upper, middle and lower distribution in the upper and lower directions of the top plate (8); the temperature measuring induction heads (92) are arranged in an oblique distribution in the left and right sides and the front and rear sides of the top plate (8).

10. The low-pressure water circulation system for cooling and cracking resistance of large-volume concrete according to claim 1 is characterized in that: The temperature measuring unit (9) and the cooling water pipe (6) are both tied and fixed to the steel bar frame (5) inside the concrete by steel wire.

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