Tunnel jet grouting pile construction process

Abstract

The present application relates to a kind of tunnel jet grouting pile construction process, belong to jet grouting pile construction technical field, including following steps: step one: cement is batched into the end of transmission module;Step two: the conveyor belt of transmission module shell bottom batch transports cement to stirring module, in this process, several weight sensors on conveyor belt detect current batch of cement weight and weight distribution and upload to control module, several heaters of transmission module shell inner wall heat drying shell inner environment, the control module adjusts the operating power of several heaters according to weight data and weight distribution data;Step three: the stirring barrel of stirring module and the stirring rod in stirring barrel proportionally stir cement and water and mix;Step four: the stirring module is transported to jet grouting pipe by cement slurry delivery pipe;Step five: the jet grouting pipe completes the construction of jet grouting pile;It is small while transporting loss to the cement classification treatment.

Description

Technical Field

[0001] This invention belongs to the field of jet grouting construction technology, specifically relating to a tunnel jet grouting construction process. Background Technology

[0002] Jet grouting is a construction method for columnar structures used in engineering. It mainly involves mixing cement into a slurry, pumping the cement slurry into a jet grouting pipe inserted into the stratum, and then spraying the cement slurry out from the nozzle on the side. The sprayed cement slurry erodes the stratum and fills the eroded space. During this process, the jet grouting pipe drives the nozzle to rotate and rise, so that the trajectory of the cement slurry sprayed out in front and behind forms a columnar shape, thus completing the construction of the jet grouting pile.

[0003] During tunnel construction, as tunnels penetrate deep into the geological structure, additional materials are needed at the tunnel face. These materials must be transported from the tunnel entrance along the tunnel excavation direction to the vicinity of the tunnel face to meet construction demands. However, as tunnel excavation deepens, the distance between the tunnel face and the tunnel entrance increases, and the material transport lines, such as cement transport lines, become longer. In such long transport lines, any problem at any node leading to material damage can result in reduced material at the final discharge point, potentially causing a material supply disruption at the tunnel face. To address this, Chinese patent CN115354661A discloses an integrated construction process for jet grouting piles and powder tank spraying in large-section loess tunnels. This process includes: Step 1: Powering on the mixing and transport mechanisms of the mobile equipment and placing bulk cement into the bulk cement tank; Step 2: Proportioning cement according to the specified ratio. Step 3: Cement and water are mixed into a slurry in the mixing mechanism; Step 4: The transportation mechanism delivers the cement slurry to the jet grouting machine; By making the mixing mechanism and transportation mechanism movable, it avoids the transportation of long-distance cement slurry with more stringent pressure and stability requirements to a certain extent, and improves the stability of cement transportation. However, in the above structure, it is still necessary to put the solid cement into the mobile equipment first. When the mobile equipment is excavating deeper into the tunnel, as the tunnel face goes further and further away from the tunnel entrance, the transportation of solid cement to the jet grouting equipment will also lead to a longer and longer transportation line, and will also face quality problems during transportation. At the same time, cement is divided into bulk cement and bagged cement. The use of bulk cement is different from that of bagged cement. Therefore, a tunnel jet grouting pile construction process is needed to ensure that the transportation loss is small while classifying and processing cement. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, this invention provides a tunnel jet grouting pile construction process that ensures continuous transportation while allowing for the classified transportation of cement.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A tunnel jet grouting pile construction process includes the following steps:

[0007] Step 1: Load cement into one end of the transmission module in batches;

[0008] Step 2: The conveyor belt at the bottom of the transmission module housing transports cement in batches to the mixing module. During this process, several weight sensors on the conveyor belt detect the weight and weight distribution of the current batch of cement. The weight sensors upload the weight data and weight distribution data to the control module. Several heaters on the inner wall of the transmission module housing heat and dry the environment inside the housing. The control module adjusts the operating power of the heaters according to the weight data and weight distribution data.

[0009] Step 3: The mixing drum of the mixing module and the mixing rod in the mixing drum mix the cement and water in proportion;

[0010] Step 4: The mixing module delivers the cement slurry to the jet grouting pipe via the cement slurry delivery pipe;

[0011] Step 5: The jet grouting pipe completes the construction of the jet grouting pile.

[0012] As a preferred embodiment of the present invention, step two further includes: a dust collection module connected to the housing of the transmission module performs dust collection on the housing; the control module is electrically connected to both the transmission module and the dust collection module; the control module instructs the conveyor belt to transport cement and the dust collection module to perform dust collection alternately; and the control module instructs the dust collection module to adjust its operating power according to the weight data of a batch of cement transported on the conveyor belt.

[0013] As a preferred embodiment of the present invention, step one further includes: loading bagged cement and bulk cement into one end of the first conveyor belt in the transmission module in batches; step two further includes: the first conveyor belt transports the bulk cement and bagged cement to the roller assembly; the bulk cement falls into the mixing module from the gap between adjacent rollers in the roller assembly; the bagged cement is transported by the roller assembly into the second conveyor belt and falls from the far end of the second conveyor belt into the bag-breaking component of the mixing module; the bag-breaking component breaks the cement bags and allows the cement to fall into the mixing module; the vibrator in each roller of the roller assembly vibrates the roller assembly and the cement on the roller assembly; and the control module adjusts the vibration power of the vibrator according to the weight data and weight distribution data.

[0014] As a preferred embodiment of the present invention, step two further includes: the control module is pre-inputting the standard power p0 of the vibrator and the standard weight m0 of the cement; the control module calculates the operating power p of the vibrator based on the weight data m, the standard weight m0 of the cement, the weight distribution data a, and the standard power p0 of the vibrator, and instructs the vibrator to operate at power p, wherein 0.5≤a≤1, 0.5m0≤m≤1.5m0, p=[log(0.6b-0.3)+2.2]×a×p0, b=m / m0.

[0015] As a preferred embodiment of the present invention, step two further includes: the control module sequentially increases the operating power of the vibrator in each roller along the conveying direction of the conveying module.

[0016] As a preferred embodiment of the present invention, step two further includes: the control module adjusts the working power p of the heater according to the weight data m and the standard weight m0 of cement, wherein 0.5≤a≤1, 0.5m0≤m≤1.5m0, p=2^c-1, c=1.5b-0.75, b=m / m0.

[0017] As a preferred embodiment of the present invention, step two further includes: the control module adjusting the power of several heaters and the number of heaters in operation according to the weight data m and the standard weight m0 of cement.

[0018] As a preferred embodiment of the present invention, step four further includes: the mixing module conveys cement slurry to the jet grouting pipe through the first cement slurry conveying pipe; the mixing module is equipped with a volume sensor; the volume sensor is used to detect the volume of the remaining cement slurry in the mixing module and upload the volume data to the control module; the control module has a pre-input volume threshold and compares the acquired volume data with the volume threshold; when the comparison result shows that the volume data is less than the threshold, the control module instructs the mixing module to disconnect from the first cement slurry conveying pipe and pump the cement into the second cement slurry conveying pipe; the second cement slurry conveying pipe conveys cement slurry to the jet grouting pipe; when the comparison result shows that the volume data is less than or greater than the threshold, the control module instructs the conveying module to disconnect from the second cement slurry conveying pipe and convey the cement slurry to the jet grouting pipe through the first cement slurry conveying pipe.

[0019] As a preferred embodiment of the present invention, step four further includes: pressure sensors in the first cement slurry conveying pipe and the second cement slurry conveying pipe are used to detect the pressure on both sides of the conveying pipe along the axial direction and upload the detection data to the control module. The control module determines whether a blockage has occurred based on the difference in pressure data on both sides. When the determination result is yes, the control module instructs the alarm to start.

[0020] The beneficial effects of this invention are as follows:

[0021] (1) By adjusting the heater power according to the weight data, the heating intensity inside the shell changes according to the amount of cement transported, avoiding material loss caused by insufficient heating and drying power leading to the inability to isolate the cement from the water and resulting in agglomeration. At the same time, it avoids material loss caused by excessive heating power leading to cement denaturation. Meanwhile, by adjusting the number of electric heaters started according to the weight distribution data, and further correcting the power, it takes into account energy saving when the heating coverage requirement is low, while ensuring heating coverage of cement when a larger coverage area is required.

[0022] (2) By setting up roller groups on the conveyor belt's transport path and having the mixing components receive bulk cement and bagged cement respectively below the roller groups and at the end of the conveyor belt, both bagged and bulk cement can be transported together when they are simultaneously input, and the two types of cement can be automatically sorted at the end of the transport process, which improves adaptability and ensures automation. At the same time, by setting up vibrators in the roller groups and having the control module control the power of the vibrators based on weight data and weight distribution data, the inability to sort the cement is avoided, and the occurrence of cement agglomeration due to vibration is reduced, thus reducing the risk of material damage.

[0023] (3) By setting up the first cement slurry delivery pipe and the second cement slurry delivery pipe at the same time, the situation of the first cement slurry delivery pipe being empty due to the low cement storage in the mixing drum when there is only one set of cement slurry delivery pipe is avoided, which ultimately leads to the occurrence of the jet grouting pipe. Attached Figure Description

[0024] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic cross-sectional view of the structure near the rotating shaft assembly of the transmission module of the present invention;

[0027] Explanation of key component symbols:

[0028] In the diagram: 1. Transmission module; 11. First conveyor belt; 12. Second conveyor belt; 13. Housing; 14. Roller assembly; 2. Mixing module; 21. First cement slurry conveying pipe; 22. Second cement slurry conveying pipe; 3. Jetting grouting pipe. Detailed Implementation

[0029] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0030] Please see Figure 1-2 A tunnel jet grouting pile construction process includes the following steps:

[0031] Step 1: Load cement into one end of the transmission module 1 in batches. In this construction process, the transmission module 1 includes a continuous rectangular shell 13 set along the tunnel excavation direction. The two ends of the rectangular shell 13 are located at the tunnel entrance and the working face or other locations where jet grouting piles need to be installed. The bottom surface of the quadrangular prism shell 13 is set parallel to the ground. A conveyor belt with the same direction as the shell 13 is set on the bottom surface of the shell 13. A temporary stacking point protruding from the shell 13 is set at the end of the conveyor belt near the tunnel entrance. The conveying direction of the conveyor belt is from the tunnel entrance to the working face. When in use, since the construction of jet grouting piles requires cement, and the excavated part of the tunnel may contain supporting structures or engineering equipment and other debris, it is not possible for the cement transport vehicle to directly transport the cement to the part near the working face where the jet grouting piles need to be installed. When the cement is transported to the tunnel entrance, the workers unload the cement and place it at the stacking point protruding from the shell 13 on the conveyor belt. The stacking point places the cement into one end of the conveyor belt in batches, and then proceeds to Step 2.

[0032] Step 2: The conveyor belt transports cement in batches to the mixing module 2. In this embodiment, the mixing module 2 includes a cement feed hopper and a mixing drum. The opening end of the cement feed hopper is set directly opposite the cement output end of the transmission module 1, and the other end of the cement feed hopper is connected to the mixing drum to complete the transportation of cement in the tunnel.

[0033] Meanwhile, to determine the total weight and weight concentration of the cement being transported in the current batch, after all the cement in the current batch is piled onto the conveyor belt at the stacking point, and during the transportation of the current batch of cement, several weight sensors on the conveyor belt detect the weight and weight distribution of the cement in the current batch. In this embodiment, to ensure measurement accuracy, the cement transport volume at the stacking point ensures that all the cement in the current batch can be simultaneously piled on the surface of the conveyor belt. Specifically, an overall weight sensor is installed below the conveyor belt to detect the total weight of all the cement on the current conveyor belt, and the total weight is used as the weight data m. At the same time, several pressure sensors are installed on the surface of the conveyor belt to detect the weight distribution of the cement on the conveyor belt. Specifically, several pressure sensors are electrically connected to the control module. When each pressure sensor detects a weight signal, it means that cement is piled on the conveyor belt around this pressure sensor. At this time, the pressure sensor uploads the pressure signal to the control module. Otherwise, it uploads a reference signal. The control module counts the proportion data a of the pressure sensors that are currently uploading pressure signals to the total number of pressure sensors, and uses the proportion to determine what proportion of the area on the conveyor belt is piled with cement, thereby determining the distribution of cement on the conveyor belt and completing the acquisition of the weight distribution.

[0034] After the conveyor belt has delivered all the cement to mixing module 2, proceed to step three.

[0035] Step 3: The mixing drum of mixing module 2 and the mixing rod in the mixing drum mix cement and water in proportion. In this embodiment, the mixing drum is a horizontally set cylindrical drum with mixing blades on the inner wall. The mixing rod is set in the inner cavity of the mixing drum and rotates to mix. In addition to being connected to the cement feed hopper, the mixing drum is also connected to the water storage tank through a valve. During mixing, after cement enters the mixing drum, water can be introduced according to the target composition of the cement slurry by automatically or manually opening the valve. Then, under the combined action of the mixing blades and the mixing rod on the inner wall of the mixing drum, the water and cement in the mixing drum mix to form cement slurry, and then step 4 is executed.

[0036] Step 4: The mixing module 2 delivers the cement slurry to the jet grouting pipe 3 through the cement slurry delivery pipe. In this embodiment, a cement pump is installed in the cement slurry delivery pipe. The cement pump inputs the cement slurry into the jet grouting pipe 3 of the jet grouting machine at a certain pressure, and then Step 5 is executed.

[0037] Step 5: The jet grouting pipe 3 completes the construction of the jet grouting pile. Specifically, after receiving the cement grout, the jet grouting pipe 3 selects the single-pipe method, two-pipe method or three-pipe method according to the specific construction requirements. After connecting the external water pipe or air pipe, jet grouting is carried out. During the grouting process, the jet grouting pipe 3 spirals upward to complete the construction of the jet grouting pile.

[0038] In step two of the above process, solid cement requires certain storage conditions. For example, when solid cement encounters water, the minerals that make up the cement, such as tricalcium silicate, dicalcium silicate, and tetracalcium aluminoferrite, undergo a hydration reaction, leading to cement hardening. At this time, some of the cement forms cement blocks. These hardened cement blocks are not only difficult to form cement slurry for use in the subsequent mixing module 2, but also have the potential to further hinder the transport of cement slurry from the cement slurry delivery pipe to the jet grouting pipe 3, resulting in a shortage of materials required by the jet grouting pipe 3. When this shortage occurs, the nozzle of the jet grouting pipe 3 cannot maintain the pressure of the ejected cement slurry, causing the profile of the jet grouting pile along its own axis to change, reducing the quality of the jet grouting pile and affecting the quality of the jet grouting pile construction. To reduce the impact of cement encountering water on the quality of the construction, [further measures are needed]. Regarding the influence of quantity, in step two, several heaters on the inner wall of the housing 13 of the transmission module 1 heat and dry the environment inside the housing 13. In this embodiment, several heaters are all set at the top of the inner wall of the cuboid transmission module 1. The heaters are divided into three rows, and the heaters in each row are arranged in a linear array. Each row of heaters is arranged along the direction of the cuboid housing 13. One row of heaters is set at the center line of the top of the housing 13, and the other two rows of heaters are respectively set on both sides of the central row of heaters. Each heater includes at least one heating wire. During transportation, the control module commands the heater to start by energizing the heating wire, and heats and evaporates the moisture in the space inside the housing 13, reducing the probability of cement coming into contact with water, thereby reducing the impact of cement coming into contact with water on the quality of construction and preventing material loss during transportation.

[0039] During the heating process of the aforementioned heater on the transport module, due to the chemical properties of cement, a continuous chemical reaction occurs inside. When the heating power is too high and the temperature around the cement is too high, there is a possibility that the chemical reaction in the cement will become unbalanced. However, when the heating power is too low, there is a possibility that the moisture inside the shell 13 cannot be evaporated to isolate the cement from the water vapor. Therefore, it is necessary to control the heating power while heating and drying the cavity inside the shell 13. To this end, during the heater start-up process in step two, the control module adjusts the operating power of several heaters based on the weight data and weight distribution data. Specifically, the control module pre-inputs a threshold value for the cement weight data. When the control module adjusts the operating power of the cement transport module, the control module adjusts the operating power of several heaters based on the weight data and weight distribution data. When the data is obtained after the start of the transport, the control module compares the weight data with the threshold to determine the magnitude of the weight data. When the weight is greater than the threshold, it means that the amount of cement being transported is larger, the surface area of ​​the cement is larger, and there is a greater probability that it will come into contact with the water vapor inside the shell 13 to harden, requiring more thorough drying. Also, more cement has a larger volume, which can absorb more excess heat and withstand more thorough heating. At this time, the control module increases the operating power of the heater. When the weight data is smaller, it means that the cement is smaller, and there is a smaller probability that it will come into contact with water to harden. Also, the smaller cement will heat up more after absorbing the same amount of heat, making it more susceptible to thermal denaturation. At this time, it is necessary to prevent denaturation caused by overheating, and the control module reduces the power of the heater.

[0040] By adjusting the heater power according to the weight data, the heating intensity inside the housing 13 is changed according to the amount of cement transported. This avoids material loss caused by insufficient heating and drying power leading to the inability to isolate cement from water and resulting in clumping, while also avoiding material loss caused by excessive heating power leading to cement denaturation.

[0041] Meanwhile, when more heaters are started simultaneously, the circuits connecting the heaters themselves have resistance, consuming electrical energy. Therefore, although the heating effect is similar when multiple heaters operate at lower power, they consume more electrical energy than when a few heaters operate at higher power. Thus, when the control module adjusts the heater power, it corrects the adjustment value based on the weight distribution data. When the data shows that the weight distribution is relatively concentrated, and only a few heaters are needed to cover the cement, the control module does not reduce or slightly reduces the heater power, allowing the heaters in operation to run at higher power, and only the heaters in the center row are powered on. When the data shows that the weight distribution is relatively dispersed, and many heaters are needed to cover the cement, the control module reduces the heater power to a greater extent and commands all three rows of heaters to start.

[0042] By adjusting the number of electric heaters activated based on weight distribution data and further modifying the power, the system can save energy when heating coverage requirements are low, while ensuring heating coverage of the cement when a larger coverage area is needed.

[0043] Specifically, in step two, after the weight sensor uploads the weight data m to the control module, the control module calculates the working power p of the heater based on the weight data m and the standard weight m0 of cement, and instructs several heaters to operate at power p, where 0.5m0≤m≤1.5m0, p=2^c-1, c=1.5b-0.75, b=m / m0. Specifically, when the uploaded data m is less than 0.5m0, the control module calculates based on 0.5m0; when it is greater than 1.5m0, the control module calculates based on 1.5m0. When the weight data m is small, close to 0.5m0, it means that the cement weight and the demand for heating are small, making it more susceptible to thermal deformation and requiring lower heating power. At this time, the output value of c=1.5b-0.75 is low, and the value of p decreases accordingly. The control module instructs the heaters to operate at a lower value. Similarly, when the weight data m is large, the value of p increases accordingly, and the control module instructs the heaters to operate at a higher value.

[0044] Meanwhile, the curve shape of the function p = 2^c - 1 determines that when the cement weight is small, the growth rate of the function is low, which avoids cement denaturation caused by the rapid increase in temperature in the transmission module 1 when the cement transport volume is small. When the cement weight is large, the growth rate of the function is high, which ensures that the heating power can keep up with the waterproofing requirements when the cement weight is high.

[0045] During cement transportation, a lot of dust is generated. This dust can easily be inhaled by workers, causing health problems. Therefore, step two also includes: a dust suction module connected to the housing 13 of the transmission module 1 suctions the housing 13. The control module is electrically connected to the transmission module 1 and the dust suction module respectively. In this embodiment, the dust suction module includes several dust suction ports and a dust collection bag. The several dust suction ports are equally spaced along the housing 13 of the transmission module 1. Each dust suction port is connected to the cavity of the transmission module 1. The dust suction ports suck in the dust generated by the cement and store it in the dust collection bag, reducing the impact of dust on the construction environment.

[0046] At the same time, the control module instructs the conveyor belt to transport cement and the dust collection module to perform dust collection alternately. Specifically, the control module determines whether it is currently in the state of transporting a certain batch of cement or in the state after transportation is completed. When it is in the state after transportation is completed, the control module stops the operation of the conveyor belt and starts the dust collection module.

[0047] Meanwhile, when the control module determines that the current system is in the state of having completed transportation, it reads the weight data of the previous batch of cement and instructs the dust collection module to adjust its operating power according to the weight data. Specifically, the operating power increases as the weight data increases. When the cement transportation volume is large and the potential dust generation is large, the dust collection power is increased. When the cement transportation volume is small and dust collection power is not required, the dust collection power is reduced to save energy.

[0048] In actual construction, cement is transported to the construction site in both bagged and bulk packaging after production. Although bulk cement is generally used in large-scale projects, it is impossible to guarantee that all cement will be in bulk during actual construction. Sometimes, cement is transported to the construction site in both bagged and bulk states simultaneously. In this case, both types of packaged cement need to be transported to the mixing module 2 to form cement slurry. Since bagged cement requires an additional unpacking process, it needs to be processed separately after simultaneous transportation. This processing requires a large amount of manual labor. Therefore, the conveyor belt in the transmission module 1 includes a first conveyor belt. 11 and 12 are connected to a transport section consisting of a roller assembly 14 at one end. The roller assembly 14 is seamlessly connected to the first conveyor belt 11 and the second conveyor belt 12 at both ends. The far end of the second conveyor belt 12 is connected to the feed hopper of the mixing module 2. The feed hopper has branches extending from it. The openings of the branches are located below the roller assembly 14 and face the roller assembly 14 upwards. A bag breaker is provided in the feed hopper connected to the far end of the second conveyor belt 12. The bag breaker is used to intercept bagged cement and break the packaging bag. The cement falls from the packaging bag into the mixing drum. Finally, the packaging bag with all the cement has leaked out is removed.

[0049] Meanwhile, in step one, bagged cement and bulk cement are first loaded into one end of the first conveyor belt 11 in the transmission module 1 in batches. In step two, the first conveyor belt 11 transports the bulk cement and bagged cement to the roller group 14. At this time, the bulk cement falls into the mixing module 2 through the gap between adjacent rollers in the roller group 14 and through the feed hopper. The bagged cement passes over the roller group 14 and is transported into the second conveyor belt 12. The second conveyor belt 12 transports the bagged cement into the feed hopper to break the bags, thus completing the unified transportation and separate processing of bagged cement and bulk cement.

[0050] By setting roller assembly 14 on the conveyor belt's transport path, and having the mixing assembly receive bulk cement and bagged cement respectively below the roller assembly 14 and at the end of the conveyor belt, both bagged and bulk cement can be transported together, and the two types of cement can be automatically processed in batches at the end of the transport, improving adaptability while ensuring automation.

[0051] When bulk cement and bagged cement pass through roller assembly 14 together, some bulk cement may pile up on the surface of bagged cement. This part of cement will pass through roller assembly 14 with the bagged cement and will not fall into the gap formed by roller assembly 14. Finally, they will enter the bag breaking component together. When there is a lot of bulk cement on the surface of bagged cement, it may block the bag breaking action and increase the workload of the bag breaking component. In order to ensure that the bulk cement enters the mixing component from below roller assembly 14 and avoid this situation, each roller in roller assembly 14 is equipped with a vibrator. Step 2 also includes: several vibrators in the roller assembly vibrate roller assembly 14. The vibration is applied to the cement in contact with roller assembly 14 and on roller assembly 14. At this time, the bulk cement piled on the surface of bagged cement is displaced by the vibration, slides off the surface of bagged cement and falls into the gap. By setting vibrators in roller assembly 14, the situation where some bulk cement fails to pass through the gap of roller assembly 14 is avoided.

[0052] During the vibration of cement by the aforementioned vibrator, if the vibration power is too strong, it can easily cause the packaging bags of bagged cement to rupture, with the bagged cement falling into the gaps, increasing the workload of the feed hopper below the roller assembly 14. Excessive vibration may also cause cement to clump, resulting in material loss. If the vibration power is too weak, it may prevent the effective separation of bulk cement above the packaging bags. Therefore, the control module adjusts the vibration power of the vibrator based on weight data and weight distribution data. Specifically, when the weight data is large, it indicates a larger cement transport volume, with a greater probability of bulk cement piling on the surface of the bagged cement. In this case, the control module increases the vibration power. Conversely, when the weight data is small, the control module decreases the vibration power to reduce the probability of cement clumping due to vibration. Simultaneously, when the weight distribution data shows that the cement weight is relatively concentrated, it indicates a larger proportion of bagged cement, with a lower probability and quantity of bulk cement piling on the surface of the bagged cement. In this case, the control module decreases the vibration power. When the weight distribution data shows that the cement weight is relatively dispersed, with a higher probability and quantity of bulk cement piling on the surface of the bagged cement, the control module increases the vibration power.

[0053] By controlling the power of the vibrator based on weight and weight distribution data, the system avoids the inability to classify and process materials, and reduces the risk of cement caking due to vibration, which could lead to material damage.

[0054] Specifically, the control module calculates the vibrator operating power p based on the weight data m, the standard cement weight m0, the weight distribution data a, and the vibrator standard power p0, and instructs several vibrators to operate at power p, where 0.5≤a≤1, 0.5m0≤m≤1.5m0, p=[log(0.6b-0.3)+2.2]×a×p0, b=m0 / m. When the uploaded data m is less than 0.5m0, the control module calculates based on 0.5m0; when it is greater than 1.5m0, the control module calculates based on 1.5m0. The calculation shows that when the value of 'a' is less than 0.5, the control module calculates using 0.5. When the weight data 'm' is small, close to 0.5m0, it indicates a smaller cement transport volume and a lower probability of bulk cement being piled on top of bagged cement. In this case, when the value of 'a' remains unchanged, the output value of 'p = [log(0.6b-0.3)+2.2]×a×p0' is lower, and the control module instructs the heater to operate at a lower value. Similarly, when the weight data 'm' is large, the value of 'p' increases accordingly, and the control module instructs the heater to operate at a higher value.

[0055] Meanwhile, when the value of 'a' is small, it means that the cement weight is more concentrated, the proportion of bagged cement is larger, and the probability and quantity of bulk cement piled on the surface of bagged cement are lower. p = [log(0.6b-0.3)+2.2]×a×p0 has a lower output value when the value of b is the same. At this time, the control module reduces the vibration power. Similarly, when the value of 'a' is large, it means that the cement is more dispersed, and the probability and quantity of bulk cement piled on the surface of bagged cement are higher. At this time, the values ​​of 'a' and 'p' are larger, and the control module controls its operation with a higher power command.

[0056] Meanwhile, the curve shape of the function p = 2^c - 1 determines that when the cement weight is small, the growth rate of the function is high. When the cement transportation volume is low, the vibration intensity increases rapidly with the increase of transportation volume to avoid the situation where the cement cannot be processed separately. When the cement weight is large, the growth rate of the function is low to avoid the cement from continuing to increase the vibration power rapidly when the output value is large, which would lead to cement clumping.

[0057] Preferably, to avoid cement from being subjected to strong vibrations suddenly from a static state, which could cause clumping, the control module increases the operating power of the vibrator in each roller sequentially along the conveying direction of the conveying module. In this embodiment, the control module makes the vibration power of the vibrator in the roller closer to the first conveyor belt 11 smaller, and the vibration power of the vibrator closer to the second conveyor belt 12 larger, and ultimately ensures that the average power of several vibrators is consistent with the calculated result of the p value, so that the vibration intensity of the cement on the roller group 14 gradually increases, avoiding the situation where the cement is subjected to strong vibrations suddenly and causes clumping.

[0058] When cement slurry is output after mixing cement in step four, if there is only one cement slurry delivery pipe, and the cement in the mixing drum is used up and needs to be replaced or refilled, although the cement slurry delivery pipe is full of cement, it is impossible to fill the cement slurry delivery pipe with subsequent cement because the mixing drum is used up. As cement slurry is supplied in the cement slurry delivery pipe, the end of the cement slurry delivery pipe near the mixing drum will have a cavity as the cement moves forward. At this time, even if the cement in the cement slurry delivery pipe is refilled by the mixing drum before it is completely consumed, there will still be a cavity between the cement slurry that is replenished and the cement slurry that was previously filled, causing a short-term interruption in the supply of cement slurry to the jet grouting pipe 3. For this reason, a volume sensor is set in the mixing module 2. The volume sensor is used to detect the volume of the remaining cement slurry in the mixing module 2 and upload the volume data to the control module. The mixing drum is connected to the first cement slurry delivery pipe 21 and the second cement slurry delivery pipe 22 at the same time.

[0059] Meanwhile, in step four, the volume sensor detects the volume of the remaining cement slurry in the mixing module 2 and uploads the volume data to the control module. The control module has a pre-input volume threshold and compares the acquired volume data with the volume threshold. When the comparison result shows that the volume data is less than the threshold, the control module instructs the mixing module 2 to disconnect from the first cement slurry delivery pipe 21 and pump the cement into the second cement slurry delivery pipe 22. The second cement slurry delivery pipe 22 delivers the cement slurry to the jet grouting pipe 3. When the comparison result shows that the volume data is less than or greater than the threshold, the control module instructs the delivery module to disconnect from the second cement slurry delivery pipe 22 and deliver the cement slurry to the jet grouting pipe 3 through the first cement slurry delivery pipe 21.

[0060] By simultaneously setting up the first cement slurry delivery pipe 21 and the second cement slurry delivery pipe 22, the situation where there is only one set of cement slurry delivery pipes is avoided. If the cement storage in the mixing drum is too low, the first cement slurry delivery pipe 21 will have a cavity, which will eventually lead to the situation of the jet grouting pipe 3.

[0061] When cement slurry enters the jet grouting pipe 3 through the first cement slurry delivery pipe 21 and the second cement slurry delivery pipe 22, there is a probability of blockage. Ordinary pressure sensors can only detect the pressure they experience to determine if the liquid delivery is smooth. When cement slurry becomes blocked, it also generates significant pressure in its surroundings, causing the pressure sensor to detect pressure and misjudge whether a blockage has occurred. Therefore, pressure sensors are installed in both the first cement slurry delivery pipe 21 and the second cement slurry delivery pipe 22. Both pressure sensors are electrically connected to the control module, which in turn is electrically connected to the alarm. The pressure sensors in the first and second cement slurry delivery pipes 21 and 22 detect the pressure on both sides along the axial direction of the delivery pipe and upload the detection data to the control module. The control module determines whether a blockage has occurred based on the difference in pressure data between the two sides. When there is a difference in the data, it indicates that the cement slurry is flowing smoothly along the pipe. During the flow, the liquid exerts a greater pressure on the upstream side of the sensor and a smaller pressure on the downstream side. When a blockage occurs, the pressure at the blockage point is equal to the pressure on its surroundings, at which point the control module instructs the alarm to activate.

[0062] Working principle and usage process of this invention:

[0063] During use, the operator first loads bagged cement and bulk cement into the first conveyor belt 11 protruding from the stacking point of the housing 13 in batches. The cement is placed at one end of the conveyor belt in batches at the stacking point. The first conveyor belt 11 transports the bulk cement and bagged cement to the roller group 14. At this time, the bulk cement falls from the gap between adjacent rollers in the roller group 14 through the feed hopper into the mixing module 2. The bagged cement passes over the roller group 14 and is transported into the second conveyor belt 12. The second conveyor belt 12 transports the bagged cement into the feed hopper to break the bags. The cement falls into the mixing drum of the mixing module 2. The mixing drum and the mixing rod in the mixing drum mix the cement and water in proportion and, according to the cement storage, transport it to the jet grouting pipe 3 through the first cement slurry conveying pipe 21 or the second cement slurry conveying pipe 22.

[0064] In the above process, the transmission module 1 determines the weight and weight distribution of the cement. Based on the weight and weight distribution data, the heaters in the transmission module 1 adjust the operating power of several heaters, the operating power of the dust extraction module, and the vibration intensity of the vibrator in the roller assembly 14. The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A tunnel jet grouting pile construction process, characterized in that: Includes the following steps: Step 1: Load cement into one end of the transmission module in batches; Step Two: The conveyor belt at the bottom of the transmission module housing transports cement in batches to the mixing module. During this process, several weight sensors on the conveyor belt detect the weight and weight distribution of the current batch of cement. These weight sensors upload the weight data *m* and weight distribution data *a* to the control module. Several heaters on the inner wall of the transmission module housing heat and dry the internal environment. The control module adjusts the working power *p* of the heaters according to the weight data *m* and the standard cement weight *m0*, where 0.5 ≤ *a* ≤ 1, 0.5 *m0* ≤ *m* ≤ 1.5 *m0*, *p* = 2^*c* - 1, *c* = 1.5*b* - 0.75, and *b* = *m* / *m0*. Several pressure sensors are installed on the surface of the conveyor belt to detect the weight distribution of cement on the conveyor belt. Specifically, several pressure sensors are electrically connected to the control module. When each pressure sensor detects a weight signal, it means that cement is piled on the conveyor belt around this pressure sensor. At this time, the pressure sensor uploads the pressure signal to the control module. Otherwise, it uploads a reference signal. The control module counts the proportion data 'a' of the pressure sensors that are currently uploading pressure signals to the total number of pressure sensors. By using the proportion, it can determine what proportion of the area on the conveyor belt is piled with cement, thereby determining the distribution of cement on the conveyor belt and completing the acquisition of weight distribution. Step 3: The mixing drum of the mixing module and the mixing rod in the mixing drum mix the cement and water in proportion; Step 4: The mixing module delivers the cement slurry to the jet grouting pipe via the cement slurry delivery pipe; Step 5: The jet grouting pipe completes the construction of the jet grouting pile.

2. The tunnel jet grouting pile construction technology according to claim 1, characterized in that: Step two further includes: a dust collection module connected to the housing of the transmission module performs dust collection on the housing; the control module is electrically connected to both the transmission module and the dust collection module; the control module instructs the conveyor belt to transport cement and the dust collection module to perform dust collection alternately; the control module instructs the dust collection module to adjust its operating power according to the weight data of a batch of cement transported on the conveyor belt.

3. The tunnel jet grouting pile construction technology according to claim 1, characterized in that: Step one further includes: loading bagged cement and bulk cement into one end of the first conveyor belt in the transmission module in batches. Step two further includes: the first conveyor belt transports the bulk cement and bagged cement to the roller assembly. The bulk cement falls into the mixing module from the gap between adjacent rollers in the roller assembly. The bagged cement is transported by the roller assembly into the second conveyor belt and falls from the far end of the second conveyor belt into the bag-breaking component of the mixing module. The bag-breaking component breaks the cement bags and allows the cement to fall into the mixing module. The vibrator in each roller of the roller assembly vibrates the roller assembly and the cement on the roller assembly. The control module adjusts the vibration power of the vibrator according to the weight data and weight distribution data. The conveyor belt in the transmission module includes a first conveyor belt and a second conveyor belt. There is a transport section with a roller assembly at one end between the first conveyor belt and the second conveyor belt. The two ends of the roller assembly are seamlessly connected to the first and second conveyor belts. The far end of the second conveyor belt is connected to the feed hopper of the mixing module. A branch extends from the feed hopper. The opening of the branch is located below the roller assembly and faces the roller assembly upward.

4. The tunnel jet grouting pile construction technology according to claim 3, characterized in that: Step two further includes: the control module is pre-inputting the standard power p0 of the vibrator and the standard weight m0 of the cement. The control module calculates the operating power p of the vibrator based on the weight data m, the standard weight m0 of the cement, the weight distribution data a, and the standard power p0 of the vibrator, and instructs the vibrator to operate at power p, where 0.5≤a≤1, 0.5m0≤m≤1.5m0, p=[log(0.6b-0.3)+2.2]×a×p0, b=m / m0.

5. The tunnel jet grouting pile construction process according to claim 4, characterized in that: Step two further includes: the control module sequentially increases the operating power of the vibrator in each roller along the conveying direction of the conveying module.

6. The tunnel jet grouting pile construction technology according to claim 3, characterized in that: Step two further includes: the control module adjusting the power of several heaters and the number of heaters in operation based on the weight data m and the standard weight of cement m0.

7. The tunnel jet grouting pile construction technology according to claim 1, characterized in that: Step four further includes: the mixing module conveys cement slurry to the jet grouting pipe through the first cement slurry conveying pipe. The mixing module is equipped with a volume sensor, which is used to detect the volume of the remaining cement slurry in the mixing module and upload the volume data to the control module. The control module has a pre-input volume threshold and compares the acquired volume data with the volume threshold. When the comparison result shows that the volume data is less than the threshold, the control module instructs the mixing module to disconnect from the first cement slurry conveying pipe and pump the cement into the second cement slurry conveying pipe. The second cement slurry conveying pipe conveys cement slurry to the jet grouting pipe. When the comparison result shows that the volume data is less than or greater than the threshold, the control module instructs the mixing module to disconnect from the second cement slurry conveying pipe and convey the cement slurry to the jet grouting pipe through the first cement slurry conveying pipe.

8. The tunnel jet grouting pile construction process according to claim 7, characterized in that: Step four further includes: pressure sensors in the first and second cement slurry conveying pipes are used to detect the pressure on both sides of the conveying pipe along its axial direction and upload the detection data to the control module. The control module determines whether a blockage has occurred based on the difference in pressure data on both sides. If the determination result is yes, the control module instructs the alarm to start.

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