Tunnel concrete guniting accelerator control method and system and computer equipment

Abstract

The invention belongs to the technical field of tunnel construction, and particularly relates to a tunnel concrete guniting accelerator control method and system and computer equipment. The method comprises the following steps: firstly, acquiring a real-time position of a spray head for guniting in a tunnel, and determining an accelerator foundation proportion corresponding to the real-time position according to a preset corresponding relationship between different positions of the tunnel considering different gravity components and the accelerator foundation proportion; meanwhile, real-time environment factors influencing the concrete setting time in the tunnel are obtained, and the accelerator adjusting proportion corresponding to the real-time environment factors is determined according to the corresponding relation between the preset different environment factors and the accelerator adjusting proportion; finally, the determined basic proportion of the accelerator is adjusted according to the determined adjusting proportion of the accelerator, and an accelerator adding device is controlled according to the adjusted proportion. The influence of gravity components of different positions of the tunnel and environmental factors influencing the concrete setting time in the tunnel on the proportion of the accelerator is fully considered, so that the added accelerator is more scientific and reasonable.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a method and system for controlling a tunnel concrete shotcrete quick-setting agent, and computer equipment. Background Art

[0002] With the rapid development of transportation infrastructure construction, the number of tunnel projects is increasing. In the initial support of tunnels, shotcrete is a key construction process that can quickly provide support for the tunnel surrounding rock, prevent further deformation and collapse of the surrounding rock, ensure the safety of tunnel construction and create favorable conditions for subsequent construction.

[0003] During the tunnel excavation process, the initial support of concrete shotcrete is a key link to ensure the stability of the tunnel. Due to the shape characteristics of the circular tunnel, the gravity components at different positions are different, which will affect the setting characteristics of the concrete. At the same time, the different temperature and humidity environments in the tunnel also have a significant impact on the effect of the accelerator. As an admixture that can significantly change the setting characteristics of concrete, the accelerator is widely used in tunnel shotcrete construction.

[0004] However, in the actual application of initial tunnel support, there is a lack of accurate and systematic basis for determining the proportion of accelerators. Accelerators are often added based on experience at the construction site, which has many disadvantages. Traditional concrete shotcrete construction often adopts a fixed proportion of accelerator addition, which cannot adapt to the changes in different locations and environmental conditions of the tunnel, and easily leads to unreasonable concrete setting time, which in turn affects the support effect and construction quality. For example, there may be problems such as local concrete setting too fast, resulting in insufficient strength, or setting too slowly, affecting the construction progress; in some tunnel sections with soft surrounding rock and large water seepage, a higher proportion of accelerator may be required to achieve rapid solidification and rapid improvement of early strength, but too high a proportion of accelerator may lead to insufficient strength of concrete in the later stage and reduced durability; in tunnel sections with relatively stable and dry surrounding rock, too high a proportion of accelerator is completely unnecessary, which will only increase construction costs and may have a negative impact on concrete performance.

[0005] The Chinese invention patent with application publication number CN116241279A and application publication date 2023.06.09 discloses a wet spraying machine accelerator linkage control method, in which the accelerator consumption is the product of cement consumption and the optimal accelerator parameter rate, and the optimal accelerator parameter rate is the optimal parameter ratio obtained by the operator according to the test, and fine-tuned in combination with the actual construction conditions on site. This method mentions that the parameter ratio obtained by the test needs to be adjusted according to the on-site conditions, but no specific means are given for how to adjust it. Summary of the invention

[0006] The purpose of the present invention is to provide a tunnel concrete shotcrete accelerator control method and system, and computer equipment to solve the problem of insufficient concrete strength or slow setting caused by inappropriate accelerator ratio determined by the method in the prior art.

[0007] In order to solve the above technical problems, the present invention provides a method for controlling a tunnel concrete spraying accelerator, the method comprising: obtaining the real-time position of a spraying nozzle in a tunnel, and determining the accelerator basic ratio corresponding to the real-time position according to a preset correspondence between different tunnel positions taking into account different gravity components and the accelerator basic ratio; obtaining real-time environmental factors affecting the setting time of concrete in the tunnel, and determining the accelerator adjustment ratio corresponding to the real-time environmental factors according to a preset correspondence between different environmental factors and the accelerator adjustment ratio; adjusting the determined accelerator basic ratio according to the determined accelerator adjustment ratio, and controlling the accelerator adding device according to the adjusted ratio.

[0008] Furthermore, the preset correspondence between different positions of the tunnel considering different gravity components and the basic proportion of the accelerator includes: the tunnel is divided into the top area of ​​the tunnel and the bottom areas on both sides of the tunnel except the top area of ​​the tunnel according to the position, and the basic proportion of the accelerator in the top area of ​​the tunnel is higher than the basic proportion of the accelerator in the bottom areas on both sides of the tunnel.

[0009] Furthermore, the environmental factors include temperature and humidity.

[0010] Furthermore, the corresponding relationship between the preset environmental factors and the adjustment ratio of the accelerating agent is that one humidity range and one temperature range correspond to one acceleration agent adjustment ratio.

[0011] In order to solve the above technical problems, the present invention also provides a computer device, including a processor, wherein the processor is used to execute a computer program to implement the steps of the tunnel concrete shotcrete quick-setting agent control method introduced above.

[0012] In order to solve the above technical problems, the present invention also provides a tunnel concrete spraying accelerator control system, including a position detection module, an environmental factor detection module, a storage module and a control module; the position detection module is used to detect the real-time position of the spraying nozzle in the tunnel, the environmental factor detection module is used to detect the real-time environmental factors in the tunnel that affect the setting time of concrete, and the storage module stores the corresponding relationship between different tunnel positions considering different gravity components and the basic ratio of the accelerator, as well as the corresponding relationship between different environmental factors and the adjustment ratio of the accelerator; the control module is used to find the basic ratio of the accelerator corresponding to the real-time position and the adjustment ratio of the accelerator corresponding to the real-time environmental factor from the storage module according to the information detected by the position detection module and the environmental factor detection module, and adjust the basic ratio of the accelerator according to the adjustment ratio of the accelerator, and control the accelerator adding device according to the adjusted ratio.

[0013] Furthermore, the preset correspondence between different positions of the tunnel considering different gravity components and the basic proportion of the accelerator includes: the tunnel is divided into the top area of ​​the tunnel and the bottom areas on both sides of the tunnel except the top area of ​​the tunnel according to the position, and the basic proportion of the accelerator in the top area of ​​the tunnel is higher than the basic proportion of the accelerator in the bottom areas on both sides of the tunnel.

[0014] Furthermore, the environmental factors include temperature and humidity.

[0015] Furthermore, the corresponding relationship between the preset environmental factors and the adjustment ratio of the accelerating agent is that one humidity range and one temperature range correspond to one acceleration agent adjustment ratio.

[0016] Furthermore, the position detection module is an angle sensor arranged on the nozzle or a detection module including a rangefinder and a gyroscope, and the rangefinder is used to measure the distance between the nozzle and a fixed reference point in the tunnel.

[0017] The present invention is a pioneering invention, and its beneficial effects are as follows: the present invention provides a new method for determining the optimal ratio of the accelerating agent, specifically, taking into full consideration that the gravity component forces at different positions of the tunnel are different and the difference has different effects on the setting characteristics of the concrete, and that the environmental factors in the tunnel also have a significant effect on the effect of the accelerating agent, two relationships are preset, namely, the corresponding relationship between different positions of the tunnel and the basic ratio of the accelerating agent and the corresponding relationship between different environmental factors and the adjustment ratio of the accelerating agent, so that after obtaining the real-time position of the nozzle in the tunnel and the real-time environmental factors in the tunnel, the corresponding basic ratio of the accelerating agent and the adjustment ratio of the accelerating agent can be obtained according to the two preset relationships, and then the precise accelerating agent control ratio can be obtained by using these two ratios, so that the accelerating agent can be adaptively adjusted according to the different positions of the nozzle in the tunnel and the different environmental changes, so that the added accelerating agent is more scientific and reasonable, and the situation that the excessive addition of the accelerating agent increases the cost and has a negative impact on the durability of the concrete, and the situation that the excessive addition of the accelerating agent affects the construction progress occurs, and the quality and effect of the concrete spraying support are effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the shotcrete support of the present invention; Figure 2 It is a schematic diagram of the structure of the nozzle of the present invention; Figure 3 It is a structural diagram of a tunnel concrete shotcrete quick-setting agent control system of the present invention; Figure 4 It is a schematic diagram of the tunnel interface of the present invention.

[0019] Among them, 1. Tunnel surface to be supported, 2. Nozzle drive assembly, 3. Nozzle, 4. Ring gear track, 5. Front and rear moving gear track, 31. Fixed plate, 32. Cross-way, 33. Nozzle, 34. Mixer, 35. Angle sensor. DETAILED DESCRIPTION

[0020] The main concept of the present invention is to fully consider the influence of gravity component force and temperature and humidity at different positions of the tunnel on the proportion of accelerator, establish two relationships, namely the corresponding relationship between different positions of the tunnel and the basic proportion of accelerator and the corresponding relationship between different environmental factors and the adjustment proportion of accelerator, and then obtain the basic proportion of accelerator corresponding to the real-time position of the nozzle in the tunnel and the adjustment proportion of accelerator corresponding to the real-time environmental factors in the tunnel based on these two relationships, and use the obtained adjustment proportion of accelerator to adjust the obtained basic proportion of accelerator, and control the accelerator adding device according to the adjusted proportion, so as to achieve scientific and reasonable addition of accelerator and effectively improve the quality and effect of concrete spraying support. Based on this concept, a tunnel concrete spraying accelerator control method, a computer device and a tunnel concrete spraying accelerator control system of the present invention can be realized. In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0021] An embodiment of a tunnel concrete shotcrete quick-setting agent control system: like Figure 1 The figure shows the overall structure of the shotcrete support, which is mainly composed of the tunnel support surface 1, the nozzle drive assembly 2, the nozzle 3, the ring gear track 4, the front and rear moving gear track 5, etc., wherein the nozzle 3 is fixed to the nozzle drive assembly 2 by bolts, and the nozzle drive assembly 2 can move along the ring gear track 4. Figure 2As shown, it is a schematic diagram of the structure of the nozzle 3. The nozzle 3 is composed of a fixed plate 31, a cross-way 32, a nozzle 33, a mixer 34, an angle sensor 35 and other parts. The three ports on the nozzle 3 (port A, port B and port C) are connected to the delivery pump, the quick-setting agent pump and the air compressor respectively. The angle sensor 35 is installed on the fixed plate 31 of the nozzle 3. When the nozzle 3 moves along the ring gear track 4, the inclination angle of the fixed plate 31 can be detected at any time. According to the inclination angle and the known distance from the center of the cross section, the position of the nozzle 3 on the ring gear track 4 can be calculated at any time, so as to determine the position of the nozzle in the tunnel. In addition, in addition to the angle sensor 35, other types of sensors can also be installed on the nozzle assembly 3 to detect the position of the nozzle on the ring gear track, such as using a rangefinder (such as a laser rangefinder) combined with a gyroscope. The laser rangefinder is used to measure the distance between the nozzle and a fixed reference point in the tunnel, and the gyroscope is used to measure the angle of the nozzle, so as to determine the precise position of the nozzle in the tunnel. Moreover, an environmental factor detection device is installed in the shotcrete operation area. The environmental factor detection device is specifically used to detect environmental factors that affect the setting time of concrete in the tunnel. Considering that temperature and humidity have a significant impact on the effect of the accelerator, the environmental factors considered in this embodiment are temperature and humidity, and the corresponding environmental factor detection device is a temperature and humidity detection device. The temperature and humidity detection device evenly distributes multiple sensor nodes in the tunnel, such as setting a node every 2 meters. The sensor nodes collect temperature and humidity data of the surrounding environment in real time, and transmit the data to the control module via wireless transmission.

[0022] Based on the above introduction, a tunnel concrete shotcrete quick-setting agent control system according to the present invention includes a position detection module, an environmental factor detection module, a storage module, a control module, etc. The specific connection relationship is as follows: Figure 3 As shown. The position detection module specifically includes an angle sensor, which is used to collect the position information of the nozzle in real time and transmit it to the control module. The environmental factor detection module specifically selects a temperature and humidity detection module, which includes a plurality of temperature and humidity sensor nodes and a wireless transmission unit. The temperature and humidity sensor nodes are distributed in the tunnel, and the temperature and humidity data collected near the spraying operation area are transmitted to the control module through the wireless transmission unit. The storage module is specifically a database storage module, which uses a readable and writable storage medium to facilitate data updating and management, such as a hard disk or a solid state drive, and stores a database of corresponding relationships between different positions of the tunnel and the basic ratio of the accelerating agent and a database of the adjustment ratio of the accelerating agent under different temperature and humidity conditions. As the core of the entire system, the control module receives the information transmitted by the position detection module and the temperature and humidity detection module, retrieves the corresponding data from the database storage module for calculation, obtains the final precise control ratio of the accelerating agent, and sends a control instruction to the accelerating agent adding device.

[0023] Among them, the tunnel is divided into 2 or more regions along the circumferential direction, and theoretical calculations are performed according to the principles of mechanics, and combined with previous engineering experience data, a database of the corresponding relationship between each tunnel region and the basic ratio of the accelerating agent under different gravity components is established. For example, it can be divided into two regions, namely the top region of the tunnel and the bottom region on both sides of the tunnel except the top region of the tunnel. The top region of the tunnel has a relatively high basic ratio of the accelerating agent due to the large gravity component, while the bottom region on both sides of the tunnel has a relatively low basic ratio of the accelerating agent due to the large gravity component. Of course, a more detailed regional division can also be performed, such as adding another level between the top and bottom of the tunnel to form the top region of the tunnel, the middle region of the tunnel and the bottom region of the tunnel. The basic ratio of the accelerating agent in the corresponding top region of the tunnel is the highest, the basic ratio of the accelerating agent in the middle region of the tunnel is moderate, and the basic ratio of the accelerating agent in the bottom region of the tunnel is low.

[0024] At the same time, a large number of concrete spraying experiments under different temperature and humidity conditions were carried out in the laboratory, the optimal adjustment ratio of the accelerator under different conditions was recorded, and an adjustment ratio database of temperature, humidity and accelerator adjustment ratio was established. In the final adjustment ratio database, there can be one humidity range and one temperature range corresponding to one accelerator adjustment ratio, which is a way to integrate the temperature and humidity factors; or there can be one temperature range corresponding to one accelerator adjustment ratio, and one humidity range corresponding to one accelerator adjustment ratio. The final accelerator adjustment ratio corresponding to temperature and humidity is the fusion of the accelerator adjustment ratio corresponding to temperature and the accelerator adjustment ratio corresponding to humidity (such as direct addition), which is a way to decouple the temperature and humidity factors. Among them, the relationship between the adjustment ratio of the accelerator and the temperature and humidity is: when other factors remain unchanged, as the temperature increases, the hydration reaction rate of the concrete will accelerate, and the adjustment ratio of the accelerator will decrease, but when the temperature rises to a certain value, the adjustment ratio of the accelerator will no longer change; in a low-humidity environment, the water in the concrete evaporates faster, affecting the hydration of the cement, that is, when other factors remain unchanged, as the humidity increases, the adjustment ratio of the accelerator will decrease, and when the humidity is higher than a certain value, the humidity will no longer affect the adjustment ratio of the accelerator.

[0025] Moreover, during the entire construction process, the corresponding relationship database and the adjustment ratio database can be updated and optimized in real time according to new engineering practice data and experimental results. For example, if it is found in a certain project that the original setting effect of the accelerating agent ratio under a certain special geological condition is not good, the corresponding data in the database can be corrected by analyzing the actual monitoring data and concrete performance test results of the area, so that the accelerating agent ratio can be controlled more accurately in subsequent similar projects.

[0026] Based on the above system, a tunnel concrete shotcrete accelerator control method of the present invention can be implemented, and its specific process is as follows: 1) During the spraying operation, the position detection module and the temperature and humidity detection module work continuously, and transmit the real-time position information of the nozzle and the real-time environmental factor information (specifically including real-time temperature information and real-time humidity information) detected in real time to the control module uninterruptedly.

[0027] 2) After receiving the information, the control module first searches the corresponding relationship database for the basic ratio of the accelerator corresponding to the area where the real-time position belongs according to the nozzle position; then, based on the temperature information and humidity information, it obtains the accelerator adjustment ratio corresponding to the real-time temperature and humidity from the adjustment ratio database; finally, the basic ratio of the accelerator is adjusted according to the accelerator adjustment ratio to obtain the final accelerator control ratio, and the final accelerator ratio is fed back to the frequency converter to control the accelerator pump speed, thereby achieving precise control of the accelerator ratio.

[0028] For example, if the current nozzle is located in the top area of ​​the tunnel, the basic proportion of the accelerator obtained from the relational data is 9%. At this time, the temperature in the tunnel is 20°C and the humidity is 70%. The adjustment ratio corresponding to the temperature and humidity is -0.5% (indicating that the accelerator ratio needs to be reduced) found in the adjustment ratio database; the control module calculates according to the basic proportion of the accelerator and the adjustment proportion of the accelerator, that is, 9%+(-0.5%)=9%, and obtains the final accelerator control ratio of 9%, and sends a control instruction to the accelerator adding device according to the ratio. The accelerator adding device accurately adds the accelerator to the concrete according to the instruction.

[0029] Combine the following Figure 4 The scheme of the present invention is described. When the nozzle 3 is at position A on the top of the tunnel, under the condition that the ambient temperature and humidity and the concrete ratio are determined, the proportion of the accelerating agent added is related to the position of the nozzle 3 on the ring gear track 4. During the process of the nozzle 3 moving from position A to position B1, the proportion of the accelerating agent gradually decreases, and remains unchanged after reaching a certain value; during the process of the nozzle 3 returning from position B1 to position A, the proportion of the accelerating agent remains unchanged at first, and gradually increases after reaching a certain position. When reaching position A, the proportion of the accelerating agent reaches the maximum. The process of the nozzle 3 from position A to position B2 and the nozzle 3 from position B2 to position A corresponds to the proportion of the accelerating agent in the process from A to B1 and from B1 to A.

[0030] A computer device embodiment: A computer device embodiment of the present invention includes a memory, a processor, an internal bus and a computer program stored in the memory, and the processor and the memory communicate and exchange data with each other through the internal bus. The processor executes the computer program to implement the steps of the tunnel concrete shotcrete quick-setting agent control method described in the tunnel concrete shotcrete quick-setting agent control system embodiment of the present invention. The processor can be a processing device such as a microprocessor MCU, a programmable logic device FPGA, etc.; the memory can be various memories that use electrical energy to store information, such as RAM, ROM, etc., or it can be a memory that uses other methods.

[0031] A tunnel concrete shotcrete quick-setting agent control method embodiment: A tunnel concrete shotcrete grouting accelerating agent control method embodiment of the present invention can be based on Figure 3 The control system is realized, and its main idea is to determine the basic proportion of the accelerator according to the real-time position of the nozzle in the tunnel, and determine the adjustment proportion of the accelerator according to the real-time environmental factors in the tunnel, and then adjust the basic proportion of the accelerator according to the adjustment proportion of the accelerator, and control the accelerator adding device according to the adjusted proportion, thereby realizing the adaptive adjustment of the accelerator according to the different positions of the nozzle in the tunnel and different environmental changes. The specific principles, implementation process and other contents of this method have been described in detail in an embodiment of a tunnel concrete shotcrete accelerator control system, and will not be repeated in this embodiment.

[0032] In summary, the present invention has the following characteristics: by arranging a position detection device and a temperature and humidity detection device in the tunnel, the present invention can obtain the nozzle position and the environmental information in the tunnel in real time, providing a data basis for accurately controlling the proportion of the accelerator; the established corresponding relationship database and adjustment ratio database fully consider the influence of the gravity component at different positions of the tunnel and the environmental factors (temperature and humidity) on the proportion of the accelerator, adaptively adjust the proportion of the accelerator, make the addition of the accelerator more scientific and reasonable, and effectively improve the quality and effect of the concrete spraying support; moreover, the whole system can continuously update and optimize the database according to the actual engineering conditions, has strong adaptability, and can be widely used in tunnel engineering construction in different geological conditions and environments.

[0033] Specific implementation methods are given above, but the present invention is not limited to the described implementation methods. The basic idea of ​​the present invention lies in the above basic scheme. For ordinary technicians in this field, it does not take creative work to design various deformed models, formulas, and parameters according to the teachings of the present invention. Changes, modifications, substitutions, and variations of the implementation methods without departing from the principles and spirit of the present invention still fall within the scope of protection of the present invention.

Claims

1. A method for controlling a tunnel concrete shotcrete accelerating agent, characterized in that: The method includes: The real-time position of the spray nozzle in the tunnel is obtained, and the basic proportion of the accelerating agent corresponding to the real-time position is determined according to the preset correspondence between different positions of the tunnel and the basic proportion of the accelerating agent taking into account different gravity components; Acquire the real-time environmental factors that affect the setting time of concrete in the tunnel, and determine the adjustment ratio of the accelerating agent corresponding to the real-time environmental factors according to the corresponding relationship between different preset environmental factors and the adjustment ratio of the accelerating agent; The determined accelerator basic ratio is adjusted according to the determined accelerator adjustment ratio, and the accelerator adding device is controlled according to the adjusted ratio.

2. The method for controlling a tunnel concrete shotcrete accelerating agent according to claim 1, characterized in that: The preset correspondence between different positions of the tunnel considering different gravity components and the basic proportion of the accelerator includes: the tunnel is divided into the top area of ​​the tunnel and the bottom areas on both sides of the tunnel except the top area of ​​the tunnel according to the position, and the basic proportion of the accelerator in the top area of ​​the tunnel is higher than the basic proportion of the accelerator in the bottom areas on both sides of the tunnel.

3. The method for controlling a tunnel concrete shotcrete accelerating agent according to claim 1, characterized in that: The environmental factors include temperature and humidity.

4. The method for controlling a tunnel concrete shotcrete accelerating agent according to claim 3, characterized in that: The corresponding relationship between the preset environmental factors and the adjustment ratio of the accelerating agent is that one humidity range and one temperature range correspond to one accelerating agent adjustment ratio.

5. A computer device comprising a processor, characterized in that: The processor is used to execute a computer program to implement the steps of the method according to any one of claims 1 to 4.

6. A tunnel concrete shotcrete quick-setting agent control system, characterized in that: It includes a position detection module, an environmental factor detection module, a storage module and a control module; The position detection module is used to detect the real-time position of the spraying nozzle in the tunnel, the environmental factor detection module is used to detect the real-time environmental factors that affect the setting time of concrete in the tunnel, and the storage module stores the corresponding relationship between different positions of the tunnel and the basic proportion of the accelerating agent considering different gravity components, and the corresponding relationship between different environmental factors and the adjusting proportion of the accelerating agent; The control module is used to find the basic proportion of the accelerator corresponding to the real-time position and the adjustment proportion of the accelerator corresponding to the real-time environmental factor from the storage module according to the information detected by the position detection module and the environmental factor detection module, adjust the basic proportion of the accelerator according to the adjustment proportion of the accelerator, and control the accelerator adding device according to the adjusted proportion.

7. The tunnel concrete shotcrete accelerator control system according to claim 6, characterized in that: The preset correspondence between different positions of the tunnel considering different gravity components and the basic proportion of the accelerator includes: the tunnel is divided into the top area of ​​the tunnel and the bottom areas on both sides of the tunnel except the top area of ​​the tunnel according to the position, and the basic proportion of the accelerator in the top area of ​​the tunnel is higher than the basic proportion of the accelerator in the bottom areas on both sides of the tunnel.

8. The tunnel concrete shotcrete accelerator control system according to claim 6, characterized in that: The environmental factors include temperature and humidity.

9. The tunnel concrete shotcrete accelerator control system according to claim 8, characterized in that: The corresponding relationship between the preset environmental factors and the adjustment ratio of the accelerating agent is that one humidity range and one temperature range correspond to one accelerating agent adjustment ratio.

10. The tunnel concrete shotcrete accelerator control system according to any one of claims 6 to 9, characterized in that: The position detection module is an angle sensor arranged on the nozzle or a detection module including a rangefinder and a gyroscope, wherein the rangefinder is used to measure the distance between the nozzle and a fixed reference point in the tunnel.

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