Multipath parallel airlock type quantitative discharging powder spraying pile background and construction method

Abstract

The invention discloses a multi-path parallel airlock type powder spraying pile background for continuous quantitative discharging and a construction method, and aims to solve the technical problems of intermittent supply, limited peak flow, poor durability under high-frequency work and the like caused by an inherent mode of'charging-spraying 'sequential work of an existing single-path airlock type discharging system. Through the at least two quantitative discharging units which are arranged in parallel, the control unit is configured to execute an alternate cooperative control strategy: when any quantitative discharging unit executes the injection step, at least another quantitative discharging unit synchronously executes the material filling preparation step of the quantitative discharging unit. By means of the multi-path seamless switching cooperative working mode, pulse type intermittent supply is fundamentally innovated into stable continuous quantitative supply. The pile body quality uniformity and the construction continuity are remarkably improved, the supply flow upper limit of the system is improved in a multiplied mode, the operation reliability is enhanced due to the fault redundancy capacity, and remarkable technical and economic benefits are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of powder jet pile construction equipment, in particular, especially relates to a multi-path parallel air lock type quantitative feeding powder jet pile background and construction method. BACKGROUND

[0002] In the powder jet pile project, whether the background supply system can accurately, stably and reliably supply the curing agent powder is the key to determine the final engineering quality. The traditional feeding device (such as rotary feeder, screw conveyor) generally has the technical bottlenecks of low quantitative precision, easy to be affected by back pressure fluctuation in the conveying process, and easy to block the pipe in long distance conveying.

[0003] In order to solve the above basic problems, in another patent document entitled "Air lock type pulse feeding powder jet pile background and construction method" filed by the applicant on the same day, an innovative single-path air lock type quantitative feeding system is proposed. Through the precise coordination of "filling valve-quantitative cavity-jet valve", the system realizes high-precision batch quantitative feeding. The single-path system can meet the requirements of precision and reliability for conventional construction.

[0004] However, the applicant found that the single-path system has a fundamental limitation in its working mode due to its working principle: the two core actions of "filling" and "jetting" are sequentially executed and mutually exclusive. During the entire period of filling the quantitative cavity with powder, the system cannot perform any jetting operation. This working mode makes the powder supply necessarily pulse and discontinuous. This directly leads to periodic large fluctuations in the distribution of curing agent along the length of the pile. Specifically, during the jetting phase, the soil at the corresponding depth obtains sufficient curing agent. During the subsequent filling (no supply) phase, although the drilling of the drill rod and the stirring action of the drill bit will cause the powder to move up and down with the stirred soil to some extent, the newly added curing agent in this depth range is zero, and the local average content is necessarily lower than that formed in the jetting phase. The alternating appearance of "peak" and "valley" of powder content along the length of the pile destroys the overall uniformity of the pile body, and further affects the stability of its mechanical properties. Under the conditions of long filling time and fast drilling speed, the content at the "valley" may even be lower than the design value. Therefore, realizing uninterrupted continuous supply is the key prerequisite for obtaining uniform and high-quality pile foundation.

[0005] In addition, the upper limit of the powder supply flow of the single-path system restricts its applicability in the face of large-diameter pile types and high dosage conditions. At the same time, the durability of the equipment under the high-frequency working mode of the control valve corresponding to high flow is also a technical bottleneck that the applicant strives to break through in the future.

[0006] To this end, as a further development and improvement of the foregoing single-path feeding technology, the present application aims to provide a parallel multi-path, alternating work continuous quantitative feeding system. The present application sets up two sets of parallel and alternating work quantitative feeding units, on the basis of completely inheriting the core advantages of single-path system such as high precision, anti-blocking pipe, aims to completely eliminate the intermittent supply, and greatly improve the peak flow and operation redundancy of the system, so as to perfectly cope with the highest standard construction demand, and provide an ultimate solution for the industry with better performance, better reliability and better economy. SUMMARY

[0007] The technical problem to be solved by the present application is to overcome the intermittent supply caused by the sequential working mode of the single-path gas lock type quantitative feeding system with high precision and anti-blocking pipe, and break through the application limitations brought by it. Although the single-path system can meet the conventional construction demand, its "filling" and "jetting" actions are mutually exclusive, that is, it cannot jet material when filling, which makes its supply necessarily pulse. In the face of high standard construction, this intermittent supply not only may affect the continuous uniformity of the pile body quality, but also limits the peak flow of the system and the durability of the equipment under extreme working conditions, and the single-point fault mode also affects the fault tolerance of the operation. Therefore, the core technical problem to be solved by the present application is: how to inherit the advantages of high precision and high reliable conveying while realizing truly uninterrupted continuous quantitative supply, and synchronously improving the upper limit of the flow and the operation reliability of the system.

[0008] To solve the above problems, the present application provides a multi-path parallel gas lock type quantitative feeding powder jet pile background system. The main purpose of the present application is to propose an innovative multi-path parallel feeding unit and a matching coordination control strategy, so as to innovate the intermittent pulse supply to uninterrupted continuous supply. The core is to set at least two sets of parallel, structurally identical gas lock type quantitative feeding branches, and through the intelligent scheduling of the control unit, to make them work in the alternating cycle of "one set of jetting, one set of standby". When the first path is jetting, the second path is synchronously filling and preparing; when the first path jetting ends, the second path seamlessly takes over and starts jetting, while the first path turns into filling state. The present application aims to fundamentally eliminate the intermittent supply period through the ingenious design of multi-path coordination and seamless switching, without changing the high reliability conveying system at the back end, so as to provide an ultimate technical solution for powder jet pile with greater flow, more stable supply, and significantly enhanced reliability and economy.

[0009] To achieve the above object, the application provides a multi-path parallel airlock type quantitative feeding powder spraying pile background, which comprises a gas supply unit, a material supply unit, a pneumatic conveying unit, a material storage unit and a control unit for controlling the coordinated work of each unit. The output gas path of the gas supply unit is configured to provide a conveying gas source for the pneumatic conveying unit and a pressurized gas source for the material supply unit. The discharge port of the material supply unit is connected with at least two shunt pipes. The outlet of each shunt pipe is connected with a quantitative feeding unit. The discharge ends of all quantitative feeding units are connected with the gas outlet of the pneumatic conveying unit and communicated to a gas-solid mixing chamber. Each quantitative feeding unit comprises, in sequence along the material flow direction, a filling valve, a quantitative cavity and a spraying valve. The inlet of the filling valve is communicated with the discharge port of the material supply unit. The outlet of the spraying valve is communicated with the inlet of the gas-solid mixing chamber. The control unit is configured to coordinate the operation of at least two quantitative feeding units to realize an alternating cycle mode, so as to achieve continuous quantitative feeding of powder to the pneumatic conveying unit. The material storage unit is connected with the material supply unit and used for supplementing the material supply unit. The background realizes continuous quantitative feeding of powder, overcomes the intermittent feeding caused by sequential execution of "filling" and "spraying" in a single-path system, avoids the periodic large fluctuation of pile body curing agent distribution, ensures the stability and consistency of the overall uniformity and mechanical properties of the pile body, greatly improves the peak flow and operation redundancy of the system, and enhances the applicability to large-diameter pile types and high-dosage working conditions. The system inherits the core advantages of the single-path airlock type quantitative feeding system, such as high precision and anti-blocking pipe, while improving the system operation reliability, reducing the influence of single-point failure on the operation, improving the fault tolerance rate of the operation, and having better reliability and economy.

[0010] A control method of the multi-path parallel airlock type quantitative feeding powder spraying pile background, the control unit is configured to execute a basic quantitative feeding cycle comprising the following steps for each quantitative feeding unit: S1, filling step: control the spraying valve of the quantitative feeding unit to be in a closed state, and open the filling valve at the same time, so that the powder in the material supply unit is filled into the quantitative cavity along the shunt pipe under a preset pressure; S2, spraying step: after the filling step is completed, the filling valve of the quantitative feeding unit is controlled to be closed, and then the spraying valve is opened according to the preset parameters, so that the powder stored in the quantitative cavity is sprayed into the gas-solid mixing chamber; The control unit is further configured to coordinate the start-stop and phase of the basic dosing cycle of all dosing units, so that when any dosing unit is performing the charging step, at least another dosing unit is performing the injection step, thereby realizing continuous and uninterrupted powder supply to the gas-solid mixing chamber. By defining the basic dosing cycle of a single dosing unit (charging step and injection step) and specifying the coordination management mode of the control unit for multiple sub-unit cycles, the stable operation of the "one injection, one standby" alternating cycle working mode is ensured. From the control logic, it is ensured that when any dosing unit is performing the charging step, at least another dosing unit is performing the injection step, completely eliminating the supply intermittent period, realizing continuous and uninterrupted powder supply to the gas-solid mixing chamber, and further ensuring the uniformity of the pile quality.

[0011] As a preferred, the pneumatic conveying unit includes a powder gas injection assembly and a powder gas conveying pipe, the powder gas injection assembly includes a total gas pipe communicated with the gas supply unit and at least one gas conveying pipe, the gas inlet ends of the two gas conveying pipes are connected to the total gas pipe, and a total gas path switch valve is arranged on the total gas pipe; the gas outlet ends of the two gas conveying pipes are connected to the discharge ends of all dosing units to form a gas-solid mixing chamber; a gas conveying pipe switch valve controlled by the control unit is arranged on each gas conveying pipe; the feeding unit is connected to the gas supply unit through a feeding tank gas inlet pipe to realize pressurized gas source conveying, the gas inlet end of the feeding tank gas inlet pipe is connected to one of the gas conveying pipes, and the gas outlet end of the feeding tank gas inlet pipe is connected to the feeding unit. The structural design (total gas pipe, gas conveying pipe and corresponding switch valve) of the pneumatic conveying unit provides stable gas source support for powder conveying, the connection mode of the feeding tank gas inlet pipe can efficiently provide pressurized gas source for the feeding unit to ensure the smooth flow of powder in the feeding unit. The gas conveying pipe switch valve is controlled by the control unit, which can flexibly adjust the gas conveying state and cooperate with the work of the dosing unit to ensure the stability and reliability of the gas-solid mixing and conveying process, and improve the overall synergy and controllability of the system.

[0012] As a preferred, the central axis of each gas conveying pipe intersects with the central axis of the gas-solid mixing chamber, and the included angle is preferably less than 60°, when there are multiple gas conveying pipes, all the gas conveying pipes are distributed symmetrically along the circumference of the gas-solid mixing chamber, or are distributed at intervals along the axis of the gas-solid mixing chamber; the gas-solid mixing chamber includes a variable diameter structure composed of a converging section at the inlet end, a mixing section in the middle and a diverging section at the outlet end connected in sequence, wherein the cross section of the converging section is tapered, the mixing section is a straight pipe section with equal cross section, and the cross section of the diverging section is gradually expanded. Through the angle and distribution design of the gas conveying pipe and the gas-solid mixing chamber, it is beneficial to fully mix the gas flow and the powder, and improve the gas-solid mixing efficiency and uniformity. The variable diameter structure (converging section, mixing section and diverging section) of the gas-solid mixing chamber further optimizes the gas-solid mixing effect, makes the powder more stable in the conveying process, reduces the risk of pipe blockage, and ensures the smoothness of long-distance conveying.

[0013] As preferred, the feeding unit comprises a feeding tank body, a support frame, a connecting flange, a flow guide pipe and a feeding tank exhaust pipe; the feeding tank body is arranged on the support frame, the bottom of the feeding tank body is communicated with the flow guide pipe through the connecting flange, and the longitudinal profile shape of the flow guide pipe in the vertical plane containing the axis of the quantitative cavity includes but is not limited to a right angle profile, a horn profile or a curve shape with any other smooth transition; the feeding ends of all the shunt pipes are connected to the discharging end of the flow guide pipe; the bottom of the feeding tank body is provided with at least one vibrator; and the feeding tank exhaust pipe is connected to the top of the feeding tank body. The structure (feeding tank body, support frame, connecting flange, etc.) of the feeding unit provides a stable basic structure for the storage and conveying of the powder. The vibrator at the bottom of the feeding tank can effectively solve the problem of arching or poor flow of the powder, ensuring that the powder can smoothly enter the flow guide pipe and ensuring the filling efficiency and stability of the subsequent quantitative dosing unit.

[0014] As preferred, the control unit comprises a sensor group, a valve group and a central control cabinet; the sensor group comprises a weighing sensor for monitoring the weight of the powder curing agent in the feeding tank body and a feeding tank pressure gauge for monitoring the pressure in the tank, the weight of the feeding tank body is borne by at least three weighing sensors, each weighing sensor is fixed on the support frame, and the feeding tank body is vertically placed on the weighing sensors, and the feeding tank pressure gauge is arranged on the feeding tank body; the valve group comprises a feeding valve, a feeding tank pressurizing valve and a feeding tank exhaust valve; the feeding valve is arranged on the feeding tank body and is used for powder curing agent supplement, the feeding tank pressurizing valve is arranged on the feeding tank inlet pipe; the feeding tank exhaust valve is arranged on the feeding tank exhaust pipe, and the central control cabinet is arranged on the support frame; the central control cabinet is electrically connected with the vibrator, the valve group, the sensor group and the quantitative dosing unit. The electrical connection of the central control cabinet with each component realizes the centralized control and coordinated work of the system, and improves the automation degree and operation reliability of the system.

[0015] As preferred, the central control cabinet of the control unit is configured to dynamically control the opening and closing of the feed tank pressurizing valve and the feed tank exhaust valve based on pressure data fed back by the feed tank pressure gauge, so as to accurately maintain the pressure in the feed tank body within a preset working pressure range; this stable upstream pressure aims to ensure that when the filling valve opens to fill the dosing chamber according to the preset program, the dosing chamber can obtain a consistent powder curing agent filling amount and the same initial internal pressure each time, thereby ensuring that the amount of powder curing agent sprayed from the dosing chamber in each spraying period when the spraying valve is opened according to the preset program is highly consistent, so as to realize overall quantitative dosing; the central control cabinet of the control unit is further configured to start the vibrator outside the feed tank body in time during or before the process of filling the dosing chamber through the filling valve, according to the preset conditions or the real-time monitored powder curing agent flow state, to assist the powder curing agent in overcoming potential arching or poor flow, and to ensure that it flows smoothly and quickly into the dosing chamber. By dynamically controlling the feed tank pressurizing valve and the exhaust valve, the pressure in the feed tank is maintained within a preset range, ensuring that the filling amount and initial pressure of the dosing chamber are consistent each time, thereby ensuring that the amount of powder sprayed in each spraying period is highly consistent, improving the accuracy of quantitative dosing. Starting the vibrator in time to assist powder flow further ensures the smoothness and rapidity of dosing chamber filling, ensuring the stability and efficiency of the quantitative dosing unit.

[0016] As preferred, the storage unit includes a storage tank and a feeding mechanism for conveying the powder curing agent from the storage tank to the feed tank body, the feeding mechanism includes a feeding cage corresponding to the storage tank and a cage motor driving the feeding cage, and the bottom of the storage tank is provided with a storage tank discharge valve; the control unit automatically controls the start and stop of the feeding mechanism and the opening and closing of the storage tank discharge valve according to the signal of the weighing sensor on the feed tank body, so as to realize automatic on-demand replenishment to the feed tank body. The automatic powder conveying from the storage tank to the feed tank is realized through the feeding mechanism (feeding cage, cage motor, etc.) of the storage unit. The control unit automatically controls the feeding mechanism and the storage tank discharge valve according to the signal of the weighing sensor, realizes the automatic on-demand replenishment of the feed tank, reduces manual intervention, improves work efficiency, and avoids work interruption caused by insufficient powder.

[0017] As preferred, the dosing chamber has a variable-diameter structure, and the variable-diameter structure includes an inlet expansion section connected to the outlet of the filling valve, an intermediate equal-diameter metering section connected downstream of the inlet expansion section, and an outlet contraction section connected downstream of the intermediate equal-diameter metering section and connected to the inlet of the spraying valve. The variable-diameter structure (inlet expansion section, intermediate equal-diameter metering section, and outlet contraction section) of the dosing chamber is conducive to the entry, accurate metering, and smooth spraying of the powder, improving the quantitative accuracy and powder spraying efficiency of the dosing chamber, and ensuring the working performance of each quantitative dosing unit.

[0018] A construction method of a powder spraying pile background based on the above-mentioned multi-parallel airlock type quantitative feeding, comprising the following steps: S1, operation parameter setting: setting the background operation parameters on the control unit, the parameters at least including: the working cycle parameters of each quantitative feeding unit, the timing or phase relationship of the alternate work between the two quantitative feeding units, the preset working pressure of the material conveying tank body, the weight to be loaded into the material conveying tank, and the powder solidifying agent residual amount threshold value for starting automatic replenishment; S2, initial loading of the material conveying tank: closing the material conveying tank pressurizing valve, opening the material conveying tank exhaust valve, filling the powder solidifying agent into the material conveying tank body to the preset weight, and then closing the related valves; S3, system starting and pre-pressurizing: starting the gas supply unit, and pressurizing the material conveying tank body to the preset working pressure, while starting the pneumatic conveying unit to establish a stable conveying gas flow in the conveying pipeline, and the background enters the standby state; S4, executing parallel alternate continuous quantitative feeding: after receiving the start spraying operation instruction issued by the front-stage pile machine, the control unit immediately drives and coordinates at least two quantitative feeding units to enter the alternate cyclic working mode according to the preset parameters and timing relationship, so as to realize the uninterrupted powder feeding to the pneumatic conveying unit, and the working mode is characterized in that: When the first quantitative feeding unit executes its filling step, the second quantitative feeding unit synchronously executes its spraying step; When the first quantitative feeding unit completes the filling and enters the spraying step, the second quantitative feeding unit synchronously completes the spraying and enters the filling step, and the two sub-units are thus repeated and seamlessly switched; S5, on-demand replenishment of the material conveying tank: during the operation, when it is monitored that the powder residual amount in the material conveying tank body is lower than the preset threshold value, the feeding cycle is automatically paused and is linked with the front-stage pile machine to execute the automatic replenishment program to the material conveying tank body, and after completion, the operation is restored; S6, single-pile operation completion: after receiving the operation completion instruction of the front-stage pile machine, the feeding cycle is stopped, the valves are closed, and the operation is completed; when waiting for a new pile operation instruction, the operation procedures of steps S1 to S5 are repeatedly executed. Through the explicit use steps (operation parameter setting, initial loading, system starting and pre-pressurizing, alternate feeding, on-demand replenishment, etc.), the guidance for the standard operation of the system is provided, the stable operation of the system according to the design logic is ensured, and the continuous quantitative feeding is realized. The precise control of each link (such as parameter setting, timing coordination, automatic replenishment, etc.) in the steps guarantees the uniformity of the pile body quality, improves the adaptability and operation reliability of the system to different working conditions, and improves the operation efficiency and economy.

[0019] Compared with the prior art, the application adopts the parallel multi-path and alternate working continuous quantitative feeding system, and aims to realize the following beneficial effects: Realize uninterrupted continuous supply, guarantee the strength and uniformity of pile body: The most significant advantage of the present application is that the inherent supply intermittent period of the single-path system is completely eliminated by the alternative cycle work of the two sets of quantitative feeding units (i.e. one set is spraying, and the other set is charging), which ensures that there is a stable powder flow to the back-end during the whole process of continuous drilling of the drilling tool, fundamentally avoids the risk of "no material area" or "lack of material area" of the pile body caused by the interruption of the supply, and greatly guarantees the strength continuity and material distribution uniformity of the finished pile in the entire depth range.

[0020] Greatly improve the upper limit of the supply flow, and broaden the working condition adaptability of the equipment: By adopting the multi-path parallel structure, the theoretical maximum supply flow of the present application can reach twice that of the same single-path system. This makes it easy to deal with large-diameter, high-mixing ratio and other construction conditions with large powder demand, solves the problem that the existing single-path system cannot handle such projects due to limited flow, and greatly broadens the application range and engineering adaptability of the equipment.

[0021] Optimize the valve working mode, effectively prolong the service life of the equipment: The multi-path parallel design of the present application provides great flexibility for the working mode of the valve. When pursuing high flow output, it is not necessary to limit the single cycle time as in the single-path system, but the task can be assigned to two branches, so that the opening and closing frequency of a single valve operates in a more reasonable and more moderate range. This optimized working mode effectively reduces the mechanical impact and fatigue accumulation of the valve, thereby significantly prolonging the overall service life of the valve, improving the durability and reliability of the equipment under long-term high-load operation.

[0022] Have fault redundancy and fault tolerance capability, guarantee the continuity of construction and reduce the comprehensive cost: In the single-path system, if the valve is damaged and cannot supply material during the pile forming process, the operation must be stopped immediately for time-consuming fault diagnosis and valve replacement. If the pile foundation that has been constructed for half of the time is interrupted for a long time waiting for the back-end fault repair, it may have quality problems, and may even cause the pile position to be scrapped, causing waste. To avoid the above risks, the strategy of "regularly replacing in advance" is often adopted in engineering, that is, the valve is replaced before it reaches its actual service life, causing waste of spare parts and labor cost. The multi-path parallel structure of the present application provides valuable system fault tolerance capability. If a valve in one branch fails, the control system can intelligently isolate it and rely on the other intact branch to continue the material supply operation, realizing "sick work". At this time, although the maximum supply flow of the system is limited, the site operator can match the current powder supply capacity by appropriately reducing the drilling speed of the front-end pile machine, so as to guarantee the uninterrupted construction process. This capability effectively avoids the serious consequences and labor and material waste caused by the failure of a single component in the single-path system. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 is a front view of the overall structure of the first embodiment of the present application; Fig. 2 is a rear view of the overall structure of the first embodiment of the present application; Fig. 3 is a schematic diagram of the air supply unit structure of the first embodiment of the present application; Fig. 4 is a schematic diagram of the material storage unit structure of the first embodiment of the present application; Fig. 5 is a pneumatic conveying line diagram of the first embodiment of the present application; Fig. 6 is a schematic diagram of the quantitative material feeding unit, the gas-solid mixing chamber and the air conveying pipe structure of the first embodiment of the present application; Fig. 7 is a schematic diagram of the overall structure of the first perspective view of the material feeding unit of the first embodiment of the present application; Fig. 8 is a schematic diagram of the overall structure of the second perspective view of the material feeding unit of the first embodiment of the present application; Fig. 9 is a schematic diagram of the overall structure of the top view of the material feeding unit of the first embodiment of the present application; Fig. 10 is a schematic diagram of the construction method of the first embodiment of the present application; Fig. 11 is a schematic diagram of the quantitative material feeding unit structure of the first embodiment of the present application; Figure 12 Fig. 12 is a schematic diagram of the front desk collaborative work of the first embodiment of the present application; Figure 13 Fig. 13 is a schematic diagram of the quantitative material feeding unit structure of the second embodiment of the present application; Figure 14 Fig. 14 is a schematic diagram of the gas-solid mixing chamber structure of the third embodiment of the present application; Figure 15 Fig. 15 is a schematic diagram of the pneumatic conveying unit structure of the fourth embodiment of the present application; Figure 16 Fig. 16 is a schematic diagram of the quantitative material feeding unit, the gas-solid mixing chamber and the air conveying pipe structure of the fifth embodiment of the present application; Figure 17 Fig. 17 is a schematic diagram of the air supply unit structure of the sixth embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. EMBODIMENTS

[0025] Figs. 1 to 17 are schematic diagrams of the embodiments of the present application. Figure 12As shown, a multi-parallel air lock type quantitative feeding powder injection pile background, including gas supply unit 1, feed unit 2, quantitative feeding unit 6, pneumatic conveying unit 3, storage unit 5 and for controlling the unit work coordination control unit 4, gas supply unit 1 includes a set of air compressor 11, air tank 12 and cold dryer 13 constitute a gas supply module, the air inlet end of the cold dryer 13 is provided with an air inlet filter 141, the air outlet end is provided with two air outlet filter 142, for removing water and impurities in the compressed air. The output gas path of the gas supply unit 1 is configured to provide conveying gas source to the pneumatic conveying unit 3, and to provide pressurized gas source to the feed unit 2. The feed unit 2 includes a feed tank body 210, the feed tank body 210 is communicated with the gas supply unit 1 through the feed tank inlet pipe 214 and realizes the pressurized gas source conveying. The discharge port of the feed tank body 210 is connected with the flow guide pipe 216, specifically, as Figure 10 and Figure 11As shown, the longitudinal profile shape of the flow guide pipe 216 in the vertical plane containing its own central axis is a horn profile, which can reduce the powder flow resistance, avoid powder blockage or uneven flow caused by sudden changes in the flow channel, and ensure smooth conveying of the powder from the feed tank to the quantitative dosing unit 6. The longitudinal profile shape can also be a right angle profile or any other smooth transition curve shape. The discharge end of the flow guide pipe 216 is connected to at least two parallelly arranged shunt pipes 301; the present embodiment has two shunt pipes 301, namely a first shunt pipe 301.a and a second shunt pipe 301.b, and in specific applications, more shunt pipes 301 can be arranged in parallel, such as three, four, etc., which are based on two and increase, and the structure is similar, which will not be repeated here. The outlet of each shunt pipe 301 is connected to a quantitative dosing unit 6 (first quantitative dosing unit 6.a and second quantitative dosing unit 6.b), and the discharge ends of the two quantitative dosing units 6 and the gas outlet end of the pneumatic conveying unit 3 are connected to form a gas-solid mixing chamber 305, and a pipeline pressure relief hole 308 is arranged on the gas-solid mixing chamber 305 for pressure relief, which is convenient for further controlling the pressure in the pipe. Each quantitative dosing unit 6 includes a filling valve 61 (first filling valve 61.a and second filling valve 61.b), a quantitative cavity 62 with a predetermined volume (first quantitative cavity 62.a and second quantitative cavity 62.b), and a jet valve 63 (first jet valve 63.a and second jet valve 63.b) in sequence along the material flow direction. The inlet of the filling valve 61 is communicated with the flow guide pipe 216; the outlet of the jet valve 63 is communicated with the gas-solid mixing chamber 305 through a powder conveying pipe 307 (first powder conveying pipe 307.a and second powder conveying pipe 307.b); the control unit 4 is configured to coordinate the operation of the two quantitative dosing units 6 (first quantitative dosing unit 6.a and second quantitative dosing unit 6.b) to realize an alternating cycle working mode, so as to achieve continuous quantitative supply to the pneumatic conveying unit 3; the storage unit 5 is connected with the feeding unit 2 and is used for supplementing the feeding unit 2. The background realizes the continuous quantitative supply of the powder, overcomes the intermittent supply caused by the sequential execution of "filling" and "jetting" in the single-path system, avoids the periodic large fluctuation of the pile body curing agent distribution, and ensures the stability and consistency of the overall uniformity and mechanical properties of the pile body; greatly improves the peak flow and operation redundancy of the system, enhances the applicability to large-diameter pile types and high dosage working conditions, and inherits the core advantages of the single-path gas lock type quantitative dosing system, such as high precision and anti-blocking pipe, while improving the system operation reliability, reducing the influence of single-point failure on the operation, improving the fault tolerance rate of the operation, and the overall performance is more outstanding, with better reliability and economy.

[0026] Specifically, as shown in FIG. 11, the control unit 4 is further configured to perform a basic quantitative dosing cycle including the following steps on each quantitative dosing unit 6: S1, filling step: control the injection valve 63 of the dosing unit 6 to be in the closed state, and open the filling valve 61, so that the powder is filled into the dosing cavity 62 from the flow guide pipe 216 under the preset pressure; S2, injection step: after the completion of the filling step, control the filling valve 61 of the dosing unit 6 to be closed, and then open the injection valve 63 according to the preset parameters, so that the powder stored in the dosing cavity 62 is injected into the gas-solid mixing chamber 305; Specifically, as shown in FIG. 6, the control unit 4 is further configured to coordinate the start and stop and phase of the basic dosing cycle of the two dosing units 6, so that when a dosing unit 6 (for example, the first dosing unit 6.a) is performing the filling step a, at least another dosing unit 6 (for example, the second dosing unit 6.b) is performing the injection step b, so as to realize continuous and uninterrupted powder supply to the gas-solid mixing chamber 305. By defining the filling step and the injection step of the basic dosing cycle of the single dosing unit 6 and specifying the coordination management mode of the control unit to the multiple sub-unit cycles, the alternating cycle working mode of “one set of injection, one set of standby” is ensured to run stably. From the control logic, it is ensured that when a dosing unit 6 performs the filling step, at least another dosing unit 6 performs the injection step, which completely eliminates the supply intermittent period, realizes continuous and uninterrupted powder supply to the gas-solid mixing chamber, and further guarantees the uniformity of the pile quality.

[0027] Specifically, as shown in FIG. 5, Figure 6 , Figure 10 and Figure 11As shown, the pneumatic conveying unit 3 comprises a powder gas injection assembly 30 and a powder gas conveying pipe 31. The powder gas injection assembly 30 comprises a total gas pipe 304 communicated with the gas supply unit 1 and at least one gas conveying pipe 303. In the embodiment, two gas conveying pipes 303 are adopted, and the two gas conveying pipes 303 are respectively a first gas conveying pipe 303.a and a second gas conveying pipe 303.b. In specific applications, more gas conveying pipes 303 can also be adopted, such as three, four, etc., which are increased on the basis of two, and the structure is similar by analogy, which will not be repeated here. The gas inlet ends of the first gas conveying pipe 303.a and the second gas conveying pipe 303.b are connected to the total gas pipe 304, and the total gas pipe 304 is provided with a total gas path on-off valve 418. The gas outlet ends of the first gas conveying pipe 303.a and the second gas conveying pipe 303.b are connected to the gas-solid mixing chamber 305. Each gas conveying pipe 303 is provided with a gas conveying pipe on-off valve 419 controlled by the control unit 4. The first gas conveying pipe on-off valve 419.a is arranged on the first gas conveying pipe 303.a, and the second gas conveying pipe on-off valve 419.b is arranged on the second gas conveying pipe 303.b. The gas inlet end of the feed tank gas inlet pipe 214 on the feed tank body 210 is connected to one of the gas conveying pipes 303, the outlet of the feed tank gas inlet pipe 214 is connected to the top of the feed tank body 210, and the feed tank gas inlet pipe 214 is provided with a feed tank pressurizing valve 413. The inlet of the powder gas conveying pipe 31 is connected to the gas-solid mixing chamber 305, and the outlet of the powder gas conveying pipe 31 is connected to the stake machine 7. The structure design of the total gas pipe 304, the gas conveying pipe 303 and the corresponding on-off valve of the pneumatic conveying unit 3 provides stable gas source support for powder conveying. The connection mode of the feed tank gas inlet pipe 214 can efficiently provide pressurized gas source for the feed unit, and ensure the smooth flow of powder in the feed unit. The gas conveying pipe on-off valve 419 is controlled by the control unit, which can flexibly adjust the gas conveying state, cooperate with the work of the quantitative feeding unit 6, ensure the stability and reliability of the gas-solid mixing and conveying process, and improve the overall synergy and controllability of the system.

[0028] Specifically, as shown in FIGS. 5 and Figure 6 As shown, the two gas conveying pipes 303 are distributed symmetrically along the circumference of the gas-solid mixing chamber 305, the central axis of each gas conveying pipe 303 intersects with the central axis of the gas-solid mixing chamber 305, and the included angle is less than 60°, preferably 30°. Through the angle and distribution design of the gas conveying pipe 303 and the gas-solid mixing chamber 305, it is beneficial to fully mix the gas flow and the powder, and improve the gas-solid mixing efficiency and uniformity. And the two gas conveying pipes 303 are distributed symmetrically along the circumference of the gas-solid mixing chamber 305, Specifically, as shown in FIGS. 7 to Figure 9As shown, the feeding unit 2 further comprises a support frame 212, a connecting flange 211, a feeding tank exhaust pipe 215, a ladder and a flow guide pipe dredging hole 218; the feeding tank body 210 is a pressure vessel structure, and has a conical discharge structure at the lower end. The feeding tank body 210 is arranged on the support frame 212, and the bottom of the feeding tank body 210 is communicated with the flow guide pipe 216 through the connecting flange 211. The flow guide pipe 216 is used for conveying the powder to the gas-solid mixing chamber 305. The flow guide pipe dredging hole 218 is connected to the flow guide pipe 216 to achieve the dredging effect. The outer wall of the feeding tank body 210 is provided with a plurality of vibrators 213, and the vibrators 213 are used to ensure uniform conveying of the powder. The weight of the feeding tank body 210 is borne by three load sensors 401, and the number of load sensors in the embodiment is three, and more load sensors can also be used. The lower part of the load sensor is fixed to the support frame 212, and the upper part is connected to the outer wall of the feeding tank body 210. This connection mode allows the feeding tank body 210 to have a certain transverse activity freedom to ensure the accuracy of the load measurement while transmitting the vertical load; the top of the feeding tank body 210 is provided with a feeding valve 411 for supplementing the powder curing agent, the feeding tank exhaust pipe 215 is arranged at the top of the feeding tank body 210, and the feeding tank exhaust pipe 215 is provided with a feeding tank exhaust valve 414; the top of the feeding tank body 210 is further provided with a feeding tank safety valve 415 to ensure the safety of the gas pressure in the tank. The ladder is arranged on one side of the support frame 212 to facilitate climbing and maintenance. The vibrator 213, the load sensor 401, the feeding valve 411, the feeding tank pressurizing valve 413, the feeding tank exhaust valve 414 and the feeding tank safety valve 415 are electrically connected to the central control cabinet 42 of the control unit 4. The structure (feeding tank body 210, support frame 212, connecting flange 211, etc.) of the feeding unit 2 provides a stable basic structure for the storage and conveying of the powder. The vibrator 213 at the bottom of the feeding tank body 210 can effectively solve the problem of arching or poor flow of the powder, and ensure that the powder can smoothly enter the flow guide pipe 216, and ensure the filling efficiency and stability of the subsequent quantitative feeding unit 6.

[0029] Specifically, as Figure 3 , 7 to Figure 9As shown, the control unit 4 includes a sensor group, a valve group and a central control cabinet 42; the sensor group 40 includes three weighing sensors 401 for monitoring the weight of the powder curing agent in the feeding tank body 210, a feeding tank pressure gauge 403 for monitoring the pressure in the feeding tank body 210, a gas tank pressure gauge 404 for the gas tank 12, and a main gas pipe pressure gauge 402 for monitoring the delivery pipeline; each weighing sensor 401 is fixed to the support frame 212, and the feeding tank body 210 is vertically pressed on the weighing sensor 401, and the feeding tank pressure gauge 403 is set on the feeding tank body 210; the gas tank pressure gauge 404 is set on the top of the gas tank 12, and the main gas pipe pressure gauge 402 is set on the main gas pipe 30 of the gas supply unit 1 4, the valve group includes a feed tank pressurizing valve 413 and a feed tank exhaust valve 414 for regulating the pressure of the feed tank body 210, a feed valve 411, a storage tank discharge valve 416, a main gas circuit switch valve 418, and a gas pipe switch valve 419; the feed valve 411 is arranged at the top center of the feed tank body 210, the feed tank pressurizing valve 413 is arranged on the feed tank air inlet pipe 214, the feed tank exhaust valve 414 is arranged on the feed tank exhaust pipe 215, the storage tank discharge valve 416 is arranged at the bottom of the storage tank 50 of the storage unit 5, the main gas circuit switch valve 418 is arranged on the main gas pipe 304 of the gas supply unit 1, the main gas pipe 304 is also provided with a main gas pipe manual valve 417, and the gas pipe switch valve 419 is arranged on the gas pipe 303.

[0030] The central control cabinet 42 is electrically connected to the valve assembly 41, the sensor assembly 40, and the charging valve 61 and injection valve 63 of the quantitative dispensing unit 6. The electrical connection between the central control cabinet 42 and these components enables centralized control and coordination of the system, improving the system's automation and operational reliability. The central control cabinet 42 is configured to periodically execute a quantitative dispensing cycle comprising the following steps: Charging: Control the injection valve 63 of the quantitative discharge unit 6 to be in the closed state, and at the same time open the charging valve 61, so that under the preset working pressure of the feeding tank body 210, the powder curing agent is charged from the feeding tank body 210 through the guide tube 216 into the quantitative chamber 62 with a predetermined volume until the predetermined injection condition is reached; Injection: After the metering chamber 62 is filled, the charging valve 61 is controlled to close, and the injection valve 63 is intermittently opened and closed once or multiple times according to the preset opening frequency and / or single opening time parameters, so that the predetermined volume of powder curing agent stored in the metering chamber 62 is pulsed and injected into the gas-solid mixing chamber 305 of the pneumatic conveying unit 3 under the action of the internal pressure of the metering chamber 62.

[0031] Specifically, as shown in Figures 10 and Figure 11As shown, the internal flow passage of the dosing cavity 62 of the dosing unit 6 is configured as a variable-diameter structure connected in sequence, including an inlet expanding section connected with the outlet of the filling valve 61, a middle constant-diameter metering section connected downstream of the inlet expanding section, and an outlet reducing section connected downstream of the middle constant-diameter metering section and connected with the inlet of the injection valve 63.

[0032] Specifically, the inlet expanding section helps to reduce the flow rate of the powder curing agent entering from the flow guide pipe 216, reduce impact and disturbance, so that the powder can be filled more smoothly and densely throughout the dosing cavity 62, and improve the accuracy and repeatability of single metering. The middle constant-diameter metering section provides an accurate volume reference, ensuring the geometric consistency of each batch of powder curing agent. The outlet reducing section forms an acceleration and bundling effect on the powder curing agent in the dosing cavity 62 under high pressure, ready to be discharged at the moment the injection valve 63 is opened, thereby forming a high-speed flow with more concentrated energy and better directionality. This Venturi effect or similar throat effect helps to increase the injection speed and initial kinetic energy of the powder, enhance its penetration and initial dispersion performance in the downstream gas-solid mixing chamber 305, and possibly improve the cut-off performance of the injection valve 63, reducing powder curing agent leakage or residue. Compared with a simple constant-diameter tube dosing cavity, this "expanding-constant-diameter-reducing" structure form is more conducive to achieving fast, accurate and efficient pulse dosing by optimizing the internal flow field.

[0033] Specifically, as shown in FIGS. 7 to Figure 9 As shown, the central control cabinet 42 of the control unit 4 is configured to dynamically control the opening and closing of the feed tank pressurizing valve 413 and the feed tank exhaust valve 414 based on the pressure data fed back by the feed tank pressure gauge 403, so as to accurately maintain the pressure in the feed tank body 210 within the preset working pressure range; this stable upstream pressure aims to ensure that when the filling valve 61 opens to fill the dosing cavity 62 according to the preset program, the dosing cavity 62 can obtain consistent powder curing agent filling amount and the same initial internal pressure each time, and then ensure that the powder curing agent ejected from the dosing cavity 62 is highly consistent in each injection period when the injection valve 63 is opened according to the preset program, thereby realizing overall dosing.

[0034] Specifically, as shown in FIGS. 7 to Figure 9 As shown, the central control cabinet 42 of the control unit 4 is further configured to start the vibrator 213 on the outer wall of the feed tank body 210 in time to assist the powder curing agent to overcome potential arching or poor flow and ensure smooth and rapid flow into the dosing cavity 62 according to the preset conditions or the real-time monitored powder curing agent flow state during or before the filling of the dosing cavity 62 by the filling valve 61.

[0035] Specifically, as shown in FIG. 4, the storage unit 5 includes a storage tank 50 and a feeding mechanism for conveying the powder curing agent from the storage tank 50 to the feeding tank body 210, the feeding mechanism including a feeding cage 51 corresponding to the storage tank 50, a cage motor 52 driving the feeding cage 51, and a steel wire rope 53 fixing the cage motor 52, and the bottom of the storage tank 50 is provided with a storage tank discharge valve 416; the control unit 4 automatically controls the start and stop of the feeding mechanism and the opening and closing of the storage tank discharge valve 416 according to the signal of the weighing sensor 401 on the feeding tank body 210, so as to realize automatic feeding on demand to the feeding tank body 210.

[0036] In this embodiment, in combination with Figures 1 to 11 、 Figure 13 , a construction method of a multi-path parallel airlock type quantitative feeding powder spraying pile background is also disclosed, including the following standard steps: Operation parameter setting: set the background operation parameters on the central control cabinet 42, the parameters at least including: the working cycle parameters of each quantitative feeding unit 6 (the first quantitative feeding unit 6.a and the second quantitative feeding unit 6.b) including the filling time length, the spraying time length, etc., the timing or phase relationship of the alternate work between the two quantitative feeding units 6, the preset working pressure of the feeding tank body 210, the weight to be filled in the feeding tank 210, and the powder curing agent residual amount threshold for starting automatic feeding; Feeding tank initial filling: close the feeding tank pressurizing valve 413, open the feeding tank exhaust valve 414, fill the powder curing agent into the feeding tank body 210 to the preset weight, and then close the related valves; System starting and pre-pressurizing: start the gas supply unit 1, and pressurize the feeding tank body 210 to the preset working pressure, at the same time, start the pneumatic conveying unit 3 to establish a stable conveying gas flow in the conveying pipeline, and the background enters the standby state; Parallel alternate continuous quantitative feeding: after receiving the start spraying operation instruction issued by the front-end pile machine 7, the control unit 4 immediately drives and coordinates at least two quantitative feeding units 6 (the first quantitative feeding unit 6.a and the second quantitative feeding unit 6.b) into the alternate cyclic working mode according to the preset parameters and timing relationship, so as to realize the uninterrupted powder supply to the pneumatic conveying unit 3, and the working mode is characterized in that: When the first quantitative feeding unit 6.a performs its filling step, the second quantitative feeding unit 6.b synchronously performs its spraying step; When the first quantitative feeding unit 6.a completes the filling and enters the spraying step, the second quantitative feeding unit 6.b synchronously completes the spraying and enters the filling step, and the two sub-units are seamlessly switched in this way. The feed tank is replenished on demand: during the operation, when it is monitored that the powder in the feed tank body 210 is below the preset threshold, the discharging cycle is automatically paused and linked with the front-stage piling machine 7 to perform the automatic replenishment program to the feed tank body 210, and after completion, the operation is resumed; Single-pile operation is completed: when the operation completion instruction of the front-stage piling machine 7 is received, the discharging cycle is stopped, and the valves are closed to complete the operation; when waiting for a new pile operation instruction, the operation process of steps S1 to S5 is repeated. Embodiment

[0037] The embodiment (as shown in Figure 13 ) is similar in structure to Embodiment One, and the key difference is that the dosing cavity 62 of the dosing and discharging unit 6 of this embodiment is a straight pipe structure with equal diameters. It is a more simplified and economical airlock dosing solution, which can also achieve reliable powder filling and discharging and meet the basic requirements of dosing and discharging.

[0038] The detailed construction method of the construction background of this embodiment is the same as or substantially the same as the implementation described in Embodiment One, and will not be repeated here. Embodiment

[0039] Embodiment Three is another implementation of the present application, as shown in Figure 14 , the general structure of this embodiment is the same as that of Embodiment One, and the only difference is that in order to achieve better mixing effect, the gas-solid mixing chamber 305 adopts a variable-diameter structure composed of a converging section 305.a at the inlet end, an equal-diameter mixing section 305.b in the middle, and a diverging section 305.c at the outlet end. The cross section of the converging section 305.a is tapered, the mixing section 305.b is an equal-section straight pipe section, and the cross section of the diverging section 305.c is tapered.

[0040] Specifically, in the variable-diameter structure, the converging section 305.a at the inlet end increases the velocity of the gas-solid two-phase flow by reducing the flow area, enhancing the turbulence intensity and shear effect of the gas flow, thereby effectively dispersing the agglomerated powder particles and promoting their preliminary radial dispersion in the gas flow. The subsequent constant-diameter mixing section 305.b provides the necessary length and time for the powder particles preliminarily dispersed in the converging section 305.a to be further fully mixed under the continuous action of turbulent flow, achieving higher macroscopic and microscopic uniformity. Finally, the diverging section 305.c at the outlet end gradually expands the flow area to reduce the velocity of the gas-solid two-phase flow, stabilize the flow pattern, and further refine the uniformity of the particle distribution in the cross section, while also contributing to stable delivery in the powder-gas delivery pipe 31. This specific variable-diameter structure of the gas-solid mixing chamber 305, through the optimized combination and synergistic effect of the functions of each section, can achieve more effective and uniform mixing of the gas-solid two-phase than the traditional constant-diameter straight pipe. This ensures that the powder curing agent delivered to the front-end drilling machine has high dispersion and consistency in the gas flow, which is of great significance for improving jet uniformity, ensuring pile quality, and stabilizing the entire construction process.

[0041] The detailed construction method of the construction back-end of the present embodiment is the same as or substantially the same as the implementation described in Embodiment One, and will not be repeated here. Embodiment

[0042] The present embodiment is similar in general structure to Embodiment One, with the key difference being that, as shown in Figure 15 The gas delivery pipe 419 of the present embodiment is one. It is a more simplified and economical airlock type quantitative feeding solution that can also achieve reliable powder filling and discharge, meeting the basic requirements of quantitative feeding.

[0043] The detailed use method of the construction back-end described in the present embodiment is the same as or substantially the same as the implementation described in Embodiment One, and will not be repeated here. Embodiment

[0044] The present embodiment is another preferred implementation of the present application, aiming to provide a more stable and seamless continuous supply. Its hardware structure is basically similar to the aforementioned double-path parallel embodiment, with the main difference being that, as shown in Figure 16As shown, the quantitative dosing unit 6 comprises three parallel quantitative dosing units 6 (first quantitative dosing unit 6.a, second quantitative dosing unit 6.b and third quantitative dosing unit 6.c) in structure. To realize continuous feeding, the control unit 4 is configured to perform a "relay" cycle working strategy on the three quantitative dosing units 6. The strategy is characterized in that at any time, the system always maintains the state of "one unit in spraying, one unit in charging, and one unit in standby", ensuring that the total discharge port always has material spraying.

[0045] The typical cycle process is as follows: S1: Initial stage: the first quantitative dosing unit 6.a performs spraying, at the same time, the second quantitative dosing unit 6.b performs charging, and the third quantitative dosing unit 6.c has completed charging and is in a full-charge standby state.

[0046] S2: First switching: when the first quantitative dosing unit 6.a completes spraying, the third quantitative dosing unit 6.c in the full-charge standby state immediately takes over seamlessly and starts spraying; at the same time, the first quantitative dosing unit 6.a enters the charging step, and the second quantitative dosing unit 6.b completes charging and enters the full-charge standby state.

[0047] S3: Second switching: when the third quantitative dosing unit 6.c completes spraying, the second quantitative dosing unit 6.b in the full-charge standby state immediately takes over spraying; at the same time, the third quantitative dosing unit 6.c enters the charging step, and the first quantitative dosing unit 6.a completes charging and enters the full-charge standby state.

[0048] S4: Third switching: when the second quantitative dosing unit 6.b completes spraying, the first quantitative dosing unit 6.a in the full-charge standby state takes over spraying again, and the system returns to the initial stage, and the cycle continues.

[0049] Through the cycle of the above three stages, continuous and uninterrupted material feeding of the total discharge port is realized. Compared with the double-path alternating scheme, this three-path "relay" scheme has unique advantages: since there is always a unit in the "full-charge standby" state, the "handover" process of the spraying task can realize zero-delay seamless switching, making the final output flow more stable and uniform. In addition, this mode also reserves more relaxed time for the charging step of each unit, which is particularly advantageous for materials with poor flowability or that require a long time to complete reliable filling. Embodiment

[0050] The embodiment is similar in general structure to Embodiment One, the key difference being that, as shown in FIG. 2, the quantitative dosing unit 6 comprises two parallel quantitative dosing units 6 (first quantitative dosing unit 6.a and second quantitative dosing unit 6.b) in structure. Figure 17As shown, the air supply unit 1 of the embodiment is configured with two sets of air supply modules, each of which is composed of an air compressor 11, an air tank 12, a cold dryer 13 and the like in series.

[0051] In this configuration, the first set of air supply modules is dedicated to supplying the powder gas injection assembly 30 with high-pressure gas required for conveying; and the second set of air supply modules independently provides the material conveying tank body 210 with pressurized gas. This design of separating the pressurized gas source of the material conveying tank from the main conveying gas source of the powder effectively avoids pressure fluctuations and gas interference between the two.

[0052] The main advantages of the embodiment are reflected in that the pressure of the material conveying tank is more stable and controllable, the independent gas source ensures that the pressure in the material conveying tank body 210 is accurate and has small fluctuations, and can be maintained at a higher level as needed, thereby more reliably supporting the dry jet mixing pile construction of larger pile length, and ensuring the quality of the deep pile body.

[0053] The detailed use method of the construction background described in the embodiment is the same as or substantially the same as the implementation described in Embodiment One, and will not be repeated here.

[0054] In summary, the present application uses a parallel multi-path, alternating work continuous quantitative feeding system, which compared with the prior art, aims to achieve the following beneficial effects: uninterrupted continuous feeding, ensuring the strength and uniformity of the pile body; greatly improving the upper limit of the supply flow, widening the adaptability of the equipment working condition; optimizing the valve working mode, effectively prolonging the service life of the equipment; having fault redundancy and fault tolerance capability, ensuring the continuity of construction and reducing the overall cost. The parallel multi-path structure of the present application provides valuable system fault tolerance capability. Once a valve in one branch fails, the control system can intelligently isolate it and continue to maintain the feeding operation relying on another intact branch, realizing "sick work". At this time, although the maximum supply flow of the system will be limited, the site operator can match the current powder supply capacity by appropriately reducing the drilling speed of the front-stage pile machine, thereby ensuring that the construction process is not interrupted. This capability effectively avoids the serious consequences and waste of manpower and materials that may be caused by a single component failure in a single-path system.

[0055] Although the present application is disclosed as above, the protection scope of the present application is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and these changes and modifications will fall within the protection scope of the present application.

Claims

1. A multi-channel parallel air-lock quantitative feeding powder injection pile construction background, characterized in that: The invention comprises an air supply unit (1), a feeding unit (2), a pneumatic conveying unit (3), a material storage unit (5), and a control unit (4) for controlling the coordinated operation of each unit. The output air path of the air supply unit (1) is configured to provide a conveying air source to the pneumatic conveying unit (3) and a pressurized air source to the feeding unit (2); the discharge port of the feeding unit (2) is connected to at least two branch pipes (301); the outlet of each branch pipe (301) is connected to a quantitative discharge unit (6), and the discharge ends of all the quantitative discharge units (6) and the gas outlet end of the pneumatic conveying unit (3) are connected to a gas-solid mixing chamber ( 305); each quantitative feeding unit (6) includes a charging valve (61), a quantitative chamber (62) and an injection valve (63) in sequence along the material flow direction; the inlet of the charging valve (61) is connected to the discharge port of the feeding unit (2); the outlet of the injection valve (63) is connected to the inlet of the gas-solid mixing chamber (305); the control unit (4) is configured to coordinate and control the operation of at least two quantitative feeding units (6) to realize an alternating cyclic working mode, thereby achieving continuous quantitative supply of powder to the pneumatic conveying unit (3); the storage unit (5) is connected to the feeding unit (2) and is used to replenish the feeding unit (2).

2. A control method for the background of powder injection pile construction based on the multi-channel parallel air-lock quantitative feeding according to claim 1, characterized in that: The control unit (4) is configured to execute a basic quantitative feeding cycle for each quantitative feeding unit (6) comprising the following steps: S1: charging step: controlling the injection valve (63) of the quantitative discharge unit (6) to be in a closed state, and simultaneously opening its charging valve (61) so that the powder in the feeding unit (2) is charged into its quantitative chamber (62) along the diversion pipe (301) under a preset pressure; S2: Injection step: After the filling step is completed, the filling valve (61) of the quantitative feeding unit (6) is controlled to be closed. Then, the injection valve (63) is opened according to the preset parameters to inject the powder stored in the quantitative chamber (62) into the gas-solid mixing chamber (305); The control unit (4) is further configured to coordinate and manage the start, stop and phase of the basic quantitative feeding cycle of all quantitative feeding units (6), so that when any quantitative feeding unit (6) performs the filling step (a), at least another quantitative feeding unit (6) is performing the injection step (b), thereby achieving continuous and uninterrupted powder supply to the gas-solid mixing chamber (305).

3. The multi-channel parallel air-lock quantitative feeding powder injection pile construction background according to claim 1 is characterized in that: The pneumatic conveying unit (3) comprises a powder gas injection assembly (30) and a powder gas conveying pipe (31), wherein the powder gas injection assembly (30) comprises a main gas pipe (304) connected to the gas supply unit (1) and at least one gas delivery pipe (303), wherein the gas inlet end of the gas delivery pipe (303) is connected to the main gas pipe (304), and the main gas pipe (304) is provided with a main gas circuit switch valve (418); the gas outlet end of the gas delivery pipe (303) and the discharge ends of all quantitative feeding units (6) are connected to the gas-solid mixing chamber (305); the gas delivery pipe (303) is connected to the gas-solid mixing chamber (305) by the gas delivery pipe (303); 03) is provided with an air pipe switch valve (419) controlled by the control unit (4); the feeding unit (2) is connected to the air supply unit (1) through the feeding tank air inlet pipe (214) and realizes pressurized air source transmission, the air inlet end of the feeding tank air inlet pipe (214) is connected to one of the air pipes (303), and the air outlet end of the feeding tank air inlet pipe (214) is connected to the feeding unit (2); the inlet of the powder gas conveying pipe (31) is connected to the gas-solid mixing chamber (305), and the outlet of the powder gas conveying pipe (31) is connected to the pile driver (7).

4. The multi-channel parallel air-lock quantitative feeding powder injection pile construction background according to claim 3 is characterized in that: The central axis of each gas pipe (303) intersects with the central axis of the gas-solid mixing chamber (305), and the angle is preferably less than 60°. When there are multiple gas pipes (303), all gas pipes (303) are symmetrically distributed along the circumference of the gas-solid mixing chamber (305), or are distributed at intervals along the axial direction of the gas-solid mixing chamber (305); the gas-solid mixing chamber (305) includes a variable diameter structure composed of a contraction section (305.a) at the inlet end, a mixing section (305.b) in the middle, and a divergent section (305.c) at the outlet end, which are connected in sequence, wherein the cross section of the contraction section (305.a) is gradually contracting, the mixing section (305.b) is a straight pipe section with a constant cross section, and the cross section of the divergent section (305.c) is gradually expanding.

5. The multi-channel parallel air-lock quantitative feeding powder injection pile construction backstage according to claim 3 is characterized in that: The feeding unit (2) comprises a feeding tank body (210), a support frame (212), a connecting flange (211), a flow guide pipe (216) and a feeding tank exhaust pipe (215); the feeding tank body (210) is arranged on the support frame (212); the bottom of the feeding tank body (210) is connected to the flow guide pipe (216) via the connecting flange (211); the longitudinal profile of the flow guide pipe (216) in a vertical plane containing the central axis of the quantitative chamber (62) includes but is not limited to a right-angle profile, a bullhorn profile, or any other smoothly transitioned curved shape; the feed ends of all the diversion pipes (301) are connected to the discharge end of the flow guide pipe (216); a vibrator (213) is provided at the bottom of the feeding tank body (210); and the feeding tank exhaust pipe (215) is connected to the top of the feeding tank body (210).

6. The multi-channel parallel air-lock quantitative feeding powder injection pile construction backstage according to claim 5 is characterized in that: The control unit (4) includes a sensor group, a valve group and a central control cabinet (42); the sensor group includes a weighing sensor (401) for monitoring the weight of the powder curing agent in the feeding tank body (210) and a feeding tank pressure gauge (403) for monitoring the pressure in the tank, the weight of the feeding tank body (210) is carried by at least three weighing sensors (401), each weighing sensor (401) is fixed on the supporting frame (212), and the feeding tank body (210) is vertically pressed on the weighing sensor (401), and the feeding tank pressure gauge (403) is arranged on the feeding tank body ( 210); the valve group includes a feed valve (411), a feed tank pressurizing valve (413) and a feed tank exhaust valve (414); the feed valve (411) is arranged on the feed tank body (210) and is used for replenishing the powder curing agent, the feed tank pressurizing valve (413) is arranged on the feed tank air inlet pipe (214); the feed tank exhaust valve (414) is arranged on the feed tank exhaust pipe (215), the central control cabinet (42) is arranged on the support frame (212), and the central control cabinet (42) is electrically connected to the vibrator (213), the valve group, the sensor group and the quantitative feeding unit (6).

7. The multi-channel parallel air-lock quantitative feeding powder injection pile construction backstage according to claim 6 is characterized in that: The central control cabinet (42) of the control unit (4) is configured to dynamically control the opening and closing of the feed tank pressurizing valve (413) and the feed tank exhaust valve (414) based on the pressure data fed back by the feed tank pressure gauge (403), so as to accurately maintain the pressure in the feed tank body (210) within a preset working pressure range; this stable upstream pressure is intended to ensure that when the charging valve (61) is opened according to a preset program to charge the quantitative chamber (62), the quantitative chamber (62) can obtain a consistent amount of powder curing agent filling and the same initial internal pressure each time, thereby ensuring that the subsequent injection valve ( 63) In each injection cycle started according to a preset program, the amount of powder curing agent ejected from the quantitative chamber (62) is highly consistent, thereby achieving overall quantitative feeding; the central control cabinet (42) of the control unit (4) is further configured to, during or before the process of charging the quantitative chamber (62) through the charging valve (61), start the vibrator (213) on the outer wall of the feeding tank body (210) in a timely manner according to the preset conditions or the real-time monitoring of the flow state of the powder curing agent, so as to assist the powder curing agent in overcoming potential arching or poor flow, and ensure that it flows smoothly and quickly into the quantitative chamber (62).

8. The multi-channel parallel air-lock quantitative feeding powder injection pile construction backstage according to claim 6 is characterized in that: The storage unit (5) includes a storage tank (50) and a feeding mechanism for conveying powdered curing agent from the storage tank (50) to the feed tank body (210), the feeding mechanism including a feeding cage (51) corresponding to the storage tank (50) and a cage motor (52) for driving the feeding cage (51), and a storage tank discharge valve (416) is provided at the bottom of the storage tank (50); the control unit (4) automatically controls the start and stop of the feeding mechanism and the opening and closing of the storage tank discharge valve (416) according to the signal of the weighing sensor (401) on the feed tank body (210), so as to realize automatic replenishment of the feed tank body (210) on demand.

9. The multi-channel parallel air-lock quantitative feeding powder injection pile construction backstage according to claim 1 is characterized in that: The metering chamber (62) is a variable diameter structure, and the variable diameter structure includes an inlet diameter expansion section connected to the outlet of the charging valve (61), an intermediate constant diameter metering section connected downstream of the inlet diameter expansion section, and an outlet diameter reduction section connected downstream of the intermediate constant diameter metering section and connected to the inlet of the injection valve (63).

10. A construction method for powder injection pile construction backstage based on the multi-channel parallel air-lock quantitative feeding method described in claim 6, characterized in that: The following steps are involved: S1. Setting of operation parameters: Setting of background operation parameters on the control unit (4), the parameters including at least: working cycle parameters of each quantitative feeding unit (6) (including filling time, spraying time, etc.), timing or phase relationship of alternating operation between two quantitative feeding units (6), preset working pressure of the feeding tank body (210), weight of material to be fed into the feeding tank (210), and residual threshold value of powder curing agent for starting automatic feeding; S2, initial loading of the feeding tank: closing the feeding tank pressurizing valve (413), opening the feeding tank exhaust valve (414), filling the feeding tank body (210) with powdered curing agent to a preset weight, and then closing the relevant valves; S3, system startup and pre-pressurization: start the air supply unit (1), and pressurize the feed tank body (210) to a preset working pressure, and simultaneously start the pneumatic conveying unit (3) to establish a stable conveying airflow in the conveying pipeline, and the backstage enters a standby state; S4, executing parallel alternating continuous quantitative feeding: after receiving the spraying operation instruction from the front pile driver (7), the control unit (4) immediately drives and coordinates at least two quantitative feeding units (6) to enter the alternating cycle working mode according to the preset parameters and timing relationship, so as to realize the uninterrupted powder supply to the pneumatic conveying unit (3). The characteristics of this working mode are: (a) When the first quantitative feeding unit (6.a) performs its filling step, the second quantitative feeding unit (6.b) performs its ejection step synchronously; (b) When the first quantitative feeding unit (6.a) completes the filling and enters the injection step, the second quantitative feeding unit (6.b) simultaneously completes the injection and enters the filling step, and the two sub-units repeat this cycle in a seamless manner; S5, feeding the feeding tank as needed: during the operation, when it is detected that the powder remaining in the feeding tank body (210) is lower than the preset threshold, the feeding cycle is automatically suspended and the front pile driver (7) is linked to execute the automatic feeding procedure to the feeding tank body (210), and the operation is resumed after completion; S6, end of single pile operation: after receiving the operation completion instruction from the front pile driver (7), stop the material feeding cycle, close all valves and complete the operation; while waiting for the new pile operation instruction, repeat the operation process of steps S1 to S5.

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