Intelligent maintenance system and method for large-volume concrete of bridge bearing platform in mountain ridge area

Abstract

The invention discloses an intelligent curing system for large-volume concrete of a bridge bearing platform in a mountain ridge area, which comprises a large-volume concrete bearing platform, a cooling water storage tank is arranged beside the large-volume concrete bearing platform, and a water outlet at the bottom of the cooling water storage tank is provided with a cooling water pipe network penetrating into the large-volume concrete bearing platform. The cooling water pipe network is uniformly divided into a plurality of layers of pipeline structures from top to bottom in the mass concrete bearing platform, each layer of pipeline structure in the cooling water pipe network is of an S-shaped structure arranged in the same direction and corresponds to each other up and down, and the water outlet end of the cooling water pipe network extends out of the mass concrete bearing platform. The invention further discloses an intelligent maintenance method for the large-volume concrete of the bridge bearing platform in the mountain ridge area. The method is suitable for intelligent and high-quality maintenance work of large-volume concrete of bridge bearing platforms in mountain areas with large day and night temperature difference and high valley wind speed, and can be widely applied to the field of bridge construction.

Description

Technical Field

[0001] The present invention relates to the field of bridge construction, and in particular to an intelligent maintenance system and method for large-volume concrete of bridge caps in mountainous areas. Background Art

[0002] In order to accelerate the economic development of remote mountainous areas in southwest my country, more and more long-span bridges are being built in the Yunnan-Guizhou Plateau, where the terrain is extremely complex. The construction of large-span bridges inevitably involves the construction of large-volume concrete caps, and the temperature control and maintenance of large-volume concrete caps during construction is a difficult problem that needs to be overcome urgently. Affected by the heat release of cement hydration, after the large-volume concrete cap is poured, the hydration heat causes the internal temperature of the cap to continue to rise, and the heat is transferred outward along the concrete and to the surrounding air. When the ambient temperature is low or the external air convection is fast, the surface of the large-volume concrete cap dissipates heat quickly, and a large temperature difference will occur on the inner surface of the cap to form temperature stress. When the temperature stress exceeds the ultimate strength of the concrete, the concrete will crack and form temperature cracks. In addition, in mountainous areas, the temperature difference between day and night is large, and the wind speed along the valley direction is high, which causes the large-volume concrete surface of the cap to dissipate heat quickly, and the heat dissipation on different sides of the cap is seriously uneven, which seriously affects the quality of the finished product of the cap concrete. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned background technology and to provide an intelligent maintenance system and method for large-volume concrete of bridge pedestals in mountainous areas, so that it is suitable for the intelligent and high-quality maintenance of large-volume concrete of bridge pedestals in mountainous areas with large temperature differences between day and night and fast wind speeds in valleys.

[0004] The present invention provides an intelligent maintenance system for large-volume concrete of bridge pedestals in mountainous areas, comprising a large-volume concrete pedestal, a cooling water storage tank being provided on one side of the large-volume concrete pedestal, a cooling water pipe network penetrating into the large-volume concrete pedestal being provided at a water outlet at the bottom of the cooling water storage tank, the cooling water pipe network being evenly divided into multiple layers of pipe structures from top to bottom in the large-volume concrete pedestal, each layer of pipe structures in the cooling water pipe network being a serpentine structure arranged in the same direction and each layer of pipe structures corresponding to each other up and down, and a water outlet end of the cooling water pipe network extending out of the large-volume concrete pedestal.

[0005] In the above technical solution, a heating water tank arranged with heating pipes is provided next to the large-volume concrete pedestal, and a spray maintenance water network is provided at the water outlet of the heating water tank. The spray maintenance water network includes an annular pipeline arranged circumferentially on the top surface of the large-volume concrete pedestal, a plurality of "door"-shaped pipelines evenly arranged in a certain direction along the annular pipeline, and a connecting pipeline connecting the annular pipeline and the water outlet of the heating water tank.

[0006] In the above technical solution, a cooling water trough with a cooling device is provided next to the large-volume concrete pedestal, the first water outlet end of the cooling water pipe network extending out of the large-volume concrete pedestal is connected to the cooling water trough, and the bottom of the cooling water trough is connected to the cooling water storage tank through a connecting water pipe.

[0007] In the above technical solution, temperature sensors are provided on the upper surface, front surface, rear surface, left surface, right surface and geometric center of the large-volume concrete pedestal, wherein the "door"-shaped pipeline of the spray maintenance water network divides the upper surface, front surface and rear surface into several first areas respectively, and the temperature sensors of the upper surface, front surface and rear surface are respectively located at the center of each first area, and the left surface and the right surface are divided into several second areas in the horizontal direction, and the temperature sensors of the left surface and the right surface are respectively located at the center of each second area, and the temperature sensors are connected by connecting lines, and the temperature sensors are connected to the temperature feedback adjustment system of the computer through the data acquisition device.

[0008] In the above technical solution, the temperature feedback regulation system is a GABP (Genetic Algorithm and Back Propagation) neural network.

[0009] In the above technical solution, the heating water trough and the cooling water trough are both arranged in a multifunctional water tank of the same structure, and the multifunctional water tank is provided with an overflow baffle which separates it into a heating water trough and a cooling water trough, and the height of the overflow baffle is lower than the top surface height of the multifunctional water tank, and the second water outlet end of the cooling water pipe network extending out of the large-volume concrete pedestal is connected to the heating water trough, and the multifunctional water tank is provided with a control panel, and the signal input end of the control panel is connected to the temperature feedback adjustment system of the computer, and the signal output end of the control panel is respectively connected to the heating pipe of the heating water trough and the cooling device of the cooling water trough.

[0010] In the above technical solution, a curing water collecting trough connected to the drainage outlet of the spray curing water network is provided circumferentially at the bottom of the large-volume concrete pedestal; the drainage outlet of the curing water collecting trough is provided with a return water pipe connected to the water inlet; the water outlet of the return water pipe is connected to the cooling water trough.

[0011] In the above technical scheme, each branch pipe of the spray maintenance water network is respectively provided with an intelligent control switch and a spray port, and the intelligent control switch is connected to the temperature feedback regulation system of the computer by wireless means; the return water pipe is provided with a filtering device; the water inlet of the cooling water network is provided with a flow rate automatic device; the number of temperature sensors of the upper surface, front surface, rear surface, left surface, right surface and the geometric center of the large-volume concrete pedestal is 2 to 3; the various surfaces of the large-volume concrete pedestal are provided with thermal insulation geotextiles, wherein the thermal insulation geotextiles on the upper surface of the large-volume concrete pedestal are separated from the thermal insulation geotextiles on the front surface, rear surface, left surface and right surface.

[0012] The present invention also provides an intelligent maintenance method for large-volume concrete of bridge pedestals in mountainous areas, comprising the following steps: S1, tying the steel bars of the large-volume concrete pedestals according to the design requirements, and setting a cooling water network, wherein the water inlet of the cooling water network is connected to the cooling water storage tank, the water outlet of the cooling water network is connected to the multifunctional water tank, and the cooling water tank of the multifunctional water tank is connected to the cooling water storage tank through a connecting water pipe to form an overall cooling water circulation system; S2, adding a flow rate automatic device to the water inlet of the cooling water network, and connecting the flow rate automatic device to the temperature feedback regulation system of a computer wirelessly; S3, evenly dividing the outer surface position of the large-volume concrete pedestal before pouring into several areas in advance, and arranging temperature sensors at the inner center of the large-volume concrete pedestal and the center of each area, the metal head of the temperature sensor avoids touching the steel bars, the connecting line of the temperature sensor is routed along the bottom of the steel bars, and the end of the temperature sensor is connected to the temperature feedback regulation system of the computer through a data acquisition device to realize real-time analysis and prediction; S4, inspecting and accepting the temperature sensor and cooling water Overall circulation system, start the cooling water overall circulation system, and pour the large-volume concrete pedestal; S5, after the pouring is completed and the mold is removed, arrange the spray curing water pipe network, and set an intelligent control switch on each branch pipe of the spray curing water pipe network located on each surface of the large-volume concrete pedestal; S6, cover the outer side of the spray curing water pipe network and the outer surface of the large-volume concrete pedestal with thermal insulation geotextile, and arrange the curing water collection tank, return water pipe and filter device at the bottom of the large-volume concrete pedestal, and introduce the curing water recovered after filtration into the heating tank of the multi-functional water tank; S7, according to the development trend of the maximum temperature inside the large-volume concrete pedestal and the development trend of the temperature difference between the inside and the outside of each area, combined with the prediction results of the GABP neural network, the flow rate automatic device is intelligently adjusted to control the cooling water flow rate in the cooling water pipe network, and the water temperature of the heating tank and the cooling tank in the multi-functional water tank is controlled to adjust the development trend of the internal maximum temperature and the development trend of the temperature difference between the inside and the outside of each area in real time to prevent the maximum temperature inside the large-volume concrete pedestal, the temperature difference between the inside and the outside of each area, and the cooling rate from exceeding the threshold.

[0013] In the above technical solution, in step S7, the maximum temperature threshold inside the mass concrete cap is 75°C, and the temperature difference threshold between the inside and outside of each area of ​​the mass concrete cap is 25°C.

[0014] The intelligent maintenance system and method of the massive concrete of bridge caps in mountainous areas of the present invention have the following beneficial effects: (1) The present invention avoids temperature cracks caused by uneven cooling due to high wind speed in valleys in mountainous areas by performing modular maintenance on large-volume concrete caps in mountainous areas.

[0015] (2) The present invention uses the GABP neural network for real-time prediction to ensure that the maximum temperature inside the large-volume concrete and the maximum temperature difference between the surface and the inside of each area are adjusted in advance before reaching the threshold value, thereby avoiding the situation where the temperature control maintenance of the large-volume concrete is exceeded due to untimely control of the flow rate and water temperature of the cooling water and the curing water temperature, and can improve the quality of the foundation to the greatest extent.

[0016] (3) The present invention realizes separate control of the maintenance water temperature and the cold water temperature by adding a multifunctional water tank, thereby realizing the mutual cooperation between the surface hot water maintenance and the internal cold water cooling operation.

[0017] (4) The present invention connects the temperature sensor, the intelligent control switch of each branch of the spray maintenance water network, the flow rate automatic device of the water inlet of the cooling water pipe king, the heating pipe and the cooling device of the multi-functional water tank to a computer, and uses the GABP neural network to predict the temperature control situation. It can achieve real-time adjustment of the internal temperature of the large-volume concrete pedestal and the temperature difference between the inside and outside of each surface area, thereby improving the quality of the finished concrete of the large-volume concrete pedestal and improving the durability of the pedestal in mountainous areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The overall structural perspective view of the intelligent maintenance system for the massive concrete of the bridge cap in mountainous areas of the present invention; Figure 2 It is a top view of the overall structure of the intelligent maintenance system for large-volume concrete of bridge caps in mountainous areas of the present invention; Figure 3 It is a structural schematic diagram of a cooling water pipe network in the intelligent maintenance system of large-volume concrete of bridge caps in mountainous areas of the present invention; Figure 4 It is a schematic diagram of the structure and function of the spray curing water pipe network in the intelligent curing system of the massive concrete of the bridge cap in the mountainous area of ​​the present invention; Figure 5 It is a schematic diagram of the structure of each branch pipe of the spray curing water pipe network in the intelligent curing system of the massive concrete of the bridge cap in the mountainous area of ​​the present invention; Figure 6It is a structural schematic diagram of a multifunctional water tank and auxiliary components in the intelligent maintenance system of large-volume concrete of bridge caps in mountainous areas of the present invention; Figure 7 It is a schematic diagram of the arrangement of the thermal insulation geotextile in the intelligent maintenance system of the massive concrete of the bridge cap in the mountainous area of ​​the present invention; Figure 8 It is a schematic diagram of the arrangement of temperature sensors on the massive concrete cap in the intelligent maintenance system of massive concrete of bridge caps in mountainous areas of the present invention; Fig. 9 It is a schematic diagram of the overall process of the intelligent maintenance method of large-volume concrete of bridge caps in mountainous areas according to the present invention. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments, but the embodiments should not be construed as limiting the present invention.

[0020] The present invention provides an intelligent maintenance system and method for large-volume concrete of bridge caps in mountainous areas, which is suitable for intelligent and high-quality maintenance of large-volume concrete of bridge caps in mountainous areas with large temperature difference between day and night and fast wind speed in valleys. Among them, the temperature control maintenance feedback adjustment part includes a temperature sensor 19 arranged at a specific position of the large-volume concrete cap 1, a spray maintenance water pipe network 3 arranged on the outer surface of the large-volume concrete cap 1, a thermal insulation geotextile 2 covering the outer surface of the large-volume concrete cap 1 and the outside of the spray maintenance water pipe network 3, a multifunctional water tank 4 connected to the cooling water pipe network 15, a temperature feedback adjustment system connected to the temperature sensor 19 and the multifunctional water tank 4, and a maintenance water recovery and filtration system.

[0021] Example 1 See also Figure 1 to Figure 2 The intelligent maintenance system of the mass concrete of the bridge cap in mountainous areas of the present invention comprises a mass concrete cap 1, a cooling water storage tank 14 is arranged beside the mass concrete cap 1, and a cooling water pipe network 15 penetrating into the mass concrete cap 1 is arranged at the water outlet at the bottom of the cooling water storage tank 14, see Figure 3 The cooling water network 15 is evenly divided into multiple layers of pipeline structures from top to bottom in the large-volume concrete pedestal 1. Each layer of pipeline structure in the cooling water network 15 is a serpentine structure arranged in the same direction and each layer of pipeline structure corresponds to each other up and down. The water outlet end of the cooling water network 15 extends out of the large-volume concrete pedestal 1. In one or more embodiments, a flow rate automatic device is provided at the water inlet of the cooling water network 15.

[0022] See also Figure 4, a heating water tank 6 with a heating pipe is arranged next to the massive concrete cap 1, and a spray curing water pipe network 3 is arranged at the water outlet of the heating water tank 6, and the spray curing water pipe network 3 includes an annular pipeline arranged circumferentially on the top surface of the massive concrete cap 1, a plurality of "door"-shaped pipelines evenly arranged in a certain direction of the annular pipeline, and a connecting pipeline connecting the annular pipeline and the water outlet of the heating water tank 6. In one or more embodiments, see Figure 5 Each branch pipe of the spray maintenance water pipe network 3 is respectively provided with an intelligent control switch 17 and a spray port 18, and the intelligent control switch 17 is connected to the temperature feedback regulation system of the computer 8 by wireless means.

[0023] The spray curing water pipe network 3 is arranged on the upper surface, front surface, rear surface, left surface and right surface of the large volume concrete foundation 1. Figure 4 As shown, the spray ports 18 are arranged in a standardized manner on the spray maintenance water pipe network 3, such as Figure 5 As shown, warm water is sprayed onto the concrete surface through the spray curing water pipe network 3 for warm water curing, thereby reducing the temperature difference between the inside and outside of the large-volume concrete cap 1. An intelligent control switch 17 is provided at the end of each branch pipe of the spray curing water pipe network 3, which can make timely spray curing adjustments according to the computer GABP prediction data to reduce the temperature difference.

[0024] See also Figure 6 A cooling water trough 5 with a cooling device is provided next to the large-volume concrete pedestal 1. The first water outlet end of the cooling water pipe network 15 extending out of the large-volume concrete pedestal 1 is connected to the cooling water trough 5. The bottom of the cooling water trough 5 is connected to the cooling water storage tank 14 through a connecting water pipe 10.

[0025] See also Figure 7 The thermal insulation geotextile 2 is provided on each surface of the massive concrete foundation 1, wherein the thermal insulation geotextile 2 on the upper surface of the massive concrete foundation 1 is separated from the thermal insulation geotextile 2 on the front surface, the rear surface, the left surface and the right surface.

[0026] The outer surface of the large-volume concrete cap 1 on which the thermal insulation geotextile 2 is set is arranged outside the spray curing water pipe network 3, such as Figure 7 As shown, the thermal insulation geotextile 2 is used to cover each branch pipe of the spray curing water pipe network 3 in each area to improve the warm water curing effect. The thermal insulation geotextile 2 on the upper surface is independently set to facilitate the timely evacuation of the subsequent pier construction.

[0027] Example 2 This embodiment is basically the same as Embodiment 1, except that: See also Figure 8The upper surface, front surface, rear surface, left surface, right surface and geometric center of the large-volume concrete pedestal 1 are all provided with temperature sensors 19, wherein the "door"-shaped pipeline of the spray curing water pipe network 3 divides the upper surface, front surface and rear surface into several first areas respectively, and the temperature sensors 19 of the upper surface, front surface and rear surface are respectively located at the center of each first area, and the left surface and the right surface are divided into several second areas in the horizontal direction, and the temperature sensors 19 of the left surface and the right surface are respectively located at the center of each second area, and the temperature sensors 19 are connected by connecting lines 9, and the temperature sensors 19 are connected to the temperature feedback regulation system of the computer 8 through a data acquisition device. In one or more embodiments, the temperature feedback regulation system is a GABP neural network; the number of temperature sensors 19 in each area and geometric center of the upper surface, front surface, rear surface, left surface, right surface of the large-volume concrete pedestal 1 is 2 to 3.

[0028] The temperature sensors 19 are arranged on the surface and the center of the massive concrete cap 1, respectively. Figure 8 As shown, the temperature sensor 19 at the first position is at the center of the massive concrete cap 1 to measure the maximum temperature development trend inside the massive concrete cap 1. The temperature sensors 19 at the second to sixteenth positions are respectively arranged on the upper surface, front surface, rear surface, left surface and right surface of the massive concrete cap 1. Each of the five surfaces is as shown in FIG. Figure 2 Divided into three areas, a temperature sensor layout point is set in the center of each area. 2~3 temperature sensors can be arranged at each location to prevent sensor damage during construction and facilitate calculation of representative average values.

[0029] The other side of the temperature sensor 19 is connected to the computer 8 by wireless means. The computer 8 records and counts the temperature change trend of each temperature sensor 19 over time, and calculates the difference between the temperature of 15 surface areas and the center position. According to the collected data, the GABP prediction program is brought into the development trend of the highest temperature and the development trend of the temperature difference between the inner and outer surfaces of each surface in real time, and the temperature difference is regulated in real time according to the trend. When the maximum temperature development of the geometric center inside the large-volume concrete pedestal 1 will exceed 75°C, the water flow rate of the cooling water pipe network 15 is increased in time and the water inlet temperature of the cooling water pipe network 15 is reduced to adjust the maximum temperature development trend of the large-volume concrete pedestal 1. When the temperature difference development trend between the surface area and the internal center is about to exceed 25°C, the computer 8 remotely and automatically controls the spray curing water pipe network 3 arranged on the surface for warm water curing, and can also adjust the temperature and flow rate of the cooling water pipe network 15 inside the large-volume concrete pedestal 1 to control the development trend of the internal and external temperature difference.

[0030] Example 3 This embodiment is basically the same as Embodiment 1 and Embodiment 2, except that: See also Figure 6 The heating water trough 6 and the cooling water trough 5 are both arranged in a multifunctional water tank 4 of the same structure. The multifunctional water tank 4 is provided with an overflow baffle 16 which separates it into the heating water trough 6 and the cooling water trough 5. The height of the overflow baffle 16 is lower than the top surface height of the multifunctional water tank 4. The second water outlet end of the cooling water pipe network 15 extending out of the large-volume concrete pedestal 1 is connected to the heating water trough 6. The multifunctional water tank 4 is provided with a control panel 7. The signal input end of the control panel 7 is connected to the temperature feedback adjustment system of the computer 8, and the signal output end of the control panel 7 is respectively connected to the heating pipe of the heating water trough 6 and the cooling device of the cooling water trough 5.

[0031] The multifunctional water tank 4 is divided into two boxes. Figure 6 As shown, an overflow baffle 16 for heat insulation is set between the boxes, which is divided into a heating water tank 6 and a cooling water tank 5. The heating water tank 6 is connected to the outlet end of the cooling water network 15. An overflow water tank composed of an overflow baffle 16 and a side plate of a multifunctional water tank 4 is set between the two boxes. The return water from the cooling water network 15 is collected in the heating water tank 6. When it exceeds the overflow water tank, the excess water flows to the cooling water tank 5 for cooling. The cooled water flows into the cooling water storage tank 14 through the connecting water pipe 10 to supply cooling water for recycling.

[0032] See also Figure 1 , Figure 2 and Figure 6 The present invention also includes a curing water recovery and filtration system, which includes: a curing water collection tank 11 connected to the drain outlet of the spray curing water pipe network 3 is provided at the bottom circumferentially of the mass concrete cap 1, and the drain outlet of the curing water collection tank 11 is provided with a return water pipe 12 connected to the water inlet, and the outlet of the return water pipe 12 is connected to the cooling water tank 5. In one or more embodiments, see Figure 1 , Figure 2 and Figure 4 The return water pipe 12 is provided with a filtering device 13 .

[0033] The curing water recovery and filtration system is arranged at the bottom of the bearing, close to the large-volume concrete pedestal 1, so as to collect and aggregate the downstream curing water, and then circulate it into the cooling water tank 5 in the multi-functional water tank 4 after filtering, for subsequent curing or cooling of the large-volume concrete pedestal 1.

[0034] Example 4 See also Fig. 9 The intelligent maintenance method of the massive concrete of the bridge cap in mountainous areas of the present invention comprises the following steps: S1. Tie up the steel bars of the large concrete cap 1 according to the design requirements, and set up the cooling water pipe network 15. The water inlet of the cooling water pipe network 15 is connected to the cooling water storage tank 14, the water outlet of the cooling water pipe network 15 is connected to the multifunctional water tank 4, and the cooling water tank 5 of the multifunctional water tank 4 is connected to the multifunctional water tank 4, forming a cooling water overall circulation system. A flow rate automatic device (not shown in the figure) is added to the water inlet of the cooling water pipe network 15, and the cooling water flow rate can be remotely and intelligently controlled on the computer 8.

[0035] S2. Arrange temperature sensors 19 at 16 locations according to the pre-divided areas. Two or three temperature sensors 19 are arranged at each location. The metal head of the temperature sensor 19 should avoid touching the steel bar to avoid affecting the reliability of the temperature measurement. The temperature sensor 19 is wired along the bottom of the steel bar to avoid the subsequent workers from breaking the connection line during the pouring and vibrating process. The end of the temperature sensor 19 is connected to a data acquisition device (not shown in the figure), which can transmit data to a remote computer 8 for real-time analysis and prediction.

[0036] S3. After the temperature sensor 19 and the overall cooling water circulation system are inspected and accepted, the overall cooling water circulation system is turned on to cast the large-volume concrete pedestal 1. After the casting is completed and the formwork is removed, the spray curing water pipe network 3 is arranged. Each branch pipe of the spray curing water pipe network 3 located on each surface of the large-volume concrete pedestal 1 is provided with an intelligent control switch 17. The intelligent control switch 17 is intelligently controlled by a remote computer 8. Each branch pipe of the spray curing water pipe network 3 can be independently sprayed with water for curing at any time.

[0037] S4. Cover the outer side of the spray curing water network 3 and the outer surface of the massive concrete pedestal 1 with a thermal insulation geotextile 2, and arrange a curing water collection tank 11, a return water pipe 12 and a filtering device 13 at the bottom of the massive concrete pedestal 1 to guide the curing water recovered after filtration into the heating tank 6 of the multi-functional water tank 4.

[0038] S5. According to the development trend of the maximum temperature inside the large-volume concrete pedestal 1 and the development trend of the temperature difference between the inside and the surface of each area, combined with the prediction results of the GABP neural network, timely and intelligently adjust the flow rate of the cold water pipe and the water temperature of each box of the multi-functional water tank, and adjust the development trend of the maximum temperature inside the large-volume concrete pedestal 1 and the development trend of the temperature difference between the inside and the surface of each area in real time. Avoid the maximum temperature inside the large-volume concrete pedestal 1, the temperature difference between the inside and the surface of each area, and the cooling rate exceeding the threshold.

[0039] The present invention is dedicated to solving the existing problems of mass concrete maintenance of bridge caps in mountainous areas. First, the different outer surfaces of the mass concrete cap 1 are divided into regions, and temperature sensors 19 and multi-joint intelligently controlled spray maintenance water pipe networks 3 are arranged on the outer surfaces of different regions. The temperature sensor 19 is set at the center of the cap of the mass concrete cap 1, and the temperature difference between the center of the mass concrete cap 1 and the different regions of the outer surface of the mass concrete cap 1 after division is calculated. The development of the temperature difference is predicted by using GABP (genetic algorithm optimization neural network). Before the inner surface temperature difference reaches the maximum temperature difference required by the specification, the surface of the mass concrete cap 1 is heated or the water flow rate of the cooling water pipe network 15 is accelerated to reduce the inner surface temperature difference. A multifunctional water tank 4 is added to realize the collection of cooling water reflux. The reflux water is divided into two parts, one part of which may be heated for intelligent maintenance of the surface of the mass concrete cap 1, and the other part of the water is cooled and flows to the cooling water storage tank 14 through the overflow tank to realize water recycling. In addition, a curing water recovery and filtration system is provided below the large-volume concrete cap 1 to achieve filtration and recycling of the curing water.

[0040] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0041] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. An intelligent maintenance system for large-volume concrete bridge caps in mountainous areas, comprising a large-volume concrete cap (1), characterized in that: A cooling water storage tank (14) is provided beside the large-volume concrete pedestal (1), and a cooling water pipe network (15) penetrating into the large-volume concrete pedestal (1) is provided at the water outlet at the bottom of the cooling water storage tank (14). The cooling water pipe network (15) is evenly divided into multiple layers of pipe structures from top to bottom in the large-volume concrete pedestal (1), and each layer of pipe structures in the cooling water pipe network (15) is a serpentine structure arranged in the same direction and each layer of pipe structures corresponds to each other up and down, and the water outlet end of the cooling water pipe network (15) extends out of the large-volume concrete pedestal (1).

2. The intelligent maintenance system for large-volume concrete of bridge caps in mountainous areas according to claim 1 is characterized by: A heating water tank (6) provided with a heating pipe is arranged beside the mass concrete pedestal (1), and a spray curing water pipe network (3) is arranged at the water outlet of the heating water tank (6). The spray curing water pipe network (3) comprises an annular pipe arranged in the circumferential direction of the top surface of the mass concrete pedestal (1), a plurality of "gate"-shaped pipes evenly arranged in a certain direction along the annular pipe, and a connecting pipe connecting the annular pipe and the water outlet of the heating water tank (6).

3. The intelligent maintenance system for large-volume concrete of bridge caps in mountainous areas according to claim 2 is characterized by: A cooling water trough (5) provided with a cooling device is provided next to the mass concrete pedestal (1); a first water outlet end of the cooling water pipe network (15) extending out of the mass concrete pedestal (1) is connected to the cooling water trough (5); and a bottom of the cooling water trough (5) is connected to a cooling water storage tank (14) via a connecting water pipe (10).

4. The intelligent maintenance system for large-volume concrete of bridge caps in mountainous areas according to claim 3 is characterized by: Temperature sensors (19) are provided on the upper surface, front surface, rear surface, left surface, right surface and geometric center of the mass concrete cap (1), wherein the "door"-shaped pipeline of the spray curing water pipe network (3) divides the upper surface, front surface and rear surface into a plurality of first areas respectively, and the temperature sensors (19) of the upper surface, front surface and rear surface are respectively located at the center of each first area, and the left surface and right surface are divided into a plurality of second areas in the horizontal direction, and the temperature sensors (19) of the left surface and right surface are respectively located at the center of each second area, and the temperature sensors (19) of each temperature sensor (19) are connected to each other through a connecting line (9), and the temperature sensors (19) are connected to the temperature feedback adjustment system of the computer (8) through a data acquisition device.

5. The intelligent maintenance system for large-volume concrete of bridge caps in mountainous areas according to claim 4 is characterized by: The temperature feedback regulation system is a GABP neural network.

6. The intelligent maintenance system for large-volume concrete of bridge caps in mountainous areas according to claim 5 is characterized by: The heating water trough (6) and the cooling water trough (5) are both arranged in a multifunctional water tank (4) of the same structure. The multifunctional water tank (4) is provided with an overflow baffle (16) for dividing it into the heating water trough (6) and the cooling water trough (5). The height of the overflow baffle (16) is lower than the top surface height of the multifunctional water tank (4). The second water outlet of the cooling water pipe network (15) extending out of the large-volume concrete pedestal (1) is connected to the heating water trough (6). The multifunctional water tank (4) is provided with a control panel (7). The signal input end of the control panel (7) is connected to the temperature feedback adjustment system of the computer (8), and the signal output end of the control panel (7) is respectively connected to the heating pipe of the heating water trough (6) and the cooling device of the cooling water trough (5).

7. The intelligent maintenance system for large-volume concrete of bridge caps in mountainous areas according to claim 6 is characterized by: A curing water collecting trough (11) connected to a drain outlet of a spray curing water pipe network (3) is provided at the bottom circumference of the mass concrete cap (1); a return water pipe (12) having a water inlet connected thereto is provided at the drain outlet of the curing water collecting trough (11); and a water outlet of the return water pipe (12) is connected to a cooling water trough (5).

8. The intelligent maintenance system for large-volume concrete of bridge caps in mountainous areas according to claim 7 is characterized by: Each branch pipe of the spray curing water pipe network (3) is provided with an intelligent control switch (17) and a spray port (18), and the intelligent control switch (17) is connected to the temperature feedback adjustment system of the computer (8) by wireless means; The return water pipe (12) is provided with a filtering device (13); A flow rate automatic device is provided at the water inlet of the cooling water pipe network (15); There are 2 to 3 temperature sensors (19) in various areas of the upper surface, front surface, rear surface, left surface, right surface and geometric center of the massive concrete cap (1); A thermal insulation geotextile (2) is provided on each surface of the mass concrete cap (1), wherein the thermal insulation geotextile (2) on the upper surface of the mass concrete cap (1) is separated from the thermal insulation geotextile (2) on the front surface, the rear surface, the left surface, and the right surface.

9. An intelligent maintenance method for large-volume concrete of bridge caps in mountainous areas, characterized by: The steps include: S1. The steel bars of the large-volume concrete cap (1) are tied according to the design requirements, and a cooling water pipe network (15) is set up. The water inlet of the cooling water pipe network (15) is connected to the cooling water storage tank (14), and the water outlet of the cooling water pipe network (15) is connected to the multifunctional water tank (4). The cooling water tank (5) of the multifunctional water tank (4) is connected to the cooling water storage tank (14) through a connecting water pipe (10), so as to form an overall cooling water circulation system; S2, a flow rate automatic device is added to the water inlet of the cooling water pipe network (15), and the flow rate automatic device is wirelessly connected to the temperature feedback control system of the computer (8); S3, the outer surface of the large-volume concrete cap (1) before pouring is uniformly divided into a number of areas in advance, and a temperature sensor (19) is arranged at the center of the interior of the large-volume concrete cap (1) and the center of each area, the metal head of the temperature sensor (19) avoids touching the steel bar, the connecting line (9) of the temperature sensor (19) is laid along the bottom of the steel bar, and the end of the temperature sensor (19) is connected to the temperature feedback adjustment system of the computer (8) through a data acquisition device to realize real-time analysis and prediction; S4, inspect and accept the temperature sensor (19) and the cooling water overall circulation system, start the cooling water overall circulation system, and cast the large-volume concrete cap (1); S5. After the pouring is completed and the formwork is removed, a spray curing water pipe network (3) is arranged, and an intelligent control switch (17) is provided on each branch pipe of the spray curing water pipe network (3) located on each surface of the large-volume concrete cap (1); S6, covering the outer side of the spray curing water pipe network (3) and the outer surface of the large-volume concrete cap (1) with a thermal insulation geotextile (2), and arranging a curing water collection tank (11), a return water pipe (12) and a filtering device (13) at the bottom of the large-volume concrete cap (1), and guiding the curing water recovered after filtration into the heating tank (6) of the multifunctional water tank (4); S7. Based on the development trend of the maximum temperature inside the large-volume concrete pedestal (1) and the development trend of the temperature difference between the inside and outside of each area, combined with the prediction result of the GABP neural network, the flow rate automatic device is intelligently adjusted to control the cooling water flow rate in the cooling water pipe network (15), and the water temperature of the heating water tank (6) and the cooling water tank (5) in the multi-functional water tank (4) is controlled to adjust the development trend of the maximum temperature inside and the development trend of the temperature difference between the inside and outside of each area in real time, so as to prevent the maximum temperature inside the large-volume concrete pedestal (1), the temperature difference between the inside and outside of each area, and the cooling rate from exceeding the threshold value.

10. The intelligent maintenance method for large-volume concrete of bridge caps in mountainous areas according to claim 9 is characterized by: In step S7, the maximum temperature threshold inside the massive concrete cap (1) is 75° C., and the temperature difference threshold between the inside and outside of each area of ​​the massive concrete cap (1) is 25° C.

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