Intelligent grouting trolley and grouting method adopting same

Abstract

The invention relates to the technical field of prefabricated panel grouting, in particular to an intelligent grouting trolley and a grouting method adopting the intelligent grouting trolley. An intelligent mud jacking trolley comprises a trolley body, a mud jacking machine and a vacuumizer are arranged in the trolley body, the mud jacking machine is connected to a butt joint through two pipelines, the butt joint is in butt joint with two sets of mud jacking pipelines in a prefabricated slab, the other sides of the mud jacking pipelines in the prefabricated slab are in butt joint through a vacuum pipe, and a three-way valve is arranged on the butt joint. And the three-way valve is connected with the vacuumizer through a pipeline. The grouting machine is connected with a butt joint with a multi-channel butt joint function through two independent pipelines, the butt joint can be accurately matched with two sets of grouting pipelines in a prefabricated slab, and the sides, away from the butt joint, of the two sets of pipelines are communicated through a vacuum pipe. The three-way valve on the butt joint is connected with a vacuumizer through a special pipeline, and vacuum extraction of the prefabricated slab mud jacking pipeline is achieved.

Description

Technical Field

[0001] This invention relates to the field of grouting technology for precast slabs, and in particular to an intelligent grouting trolley and a grouting method using the grouting trolley. Background Technology

[0002] In engineering fields such as bridges and buildings, grouting of precast slabs is a key process to ensure the connection strength and durability of the structure. Its core requirement is to ensure that the grout is evenly filled in the pipeline without any air bubbles, so as to avoid the structural load-bearing capacity being reduced and the service life being shortened due to insufficient grouting. Currently, traditional grouting construction often uses single-pipe grouting equipment without a corresponding vacuum system. This results in air not being effectively expelled from the pipeline, easily leading to defects such as air bubbles and voids during grout filling, severely affecting grouting quality. Although some simple grouting trolleys are equipped with vacuum devices, they suffer from cumbersome pipeline connections, poor sealing, unstable vacuuming effects, and the inability to monitor pipeline air pressure in real time, making it difficult to accurately control vacuum parameters. Furthermore, traditional grouting processes are mostly manual, with grouting pressure and flow rate controlled entirely by experience. This easily leads to excessive pressure fluctuations and asynchronous grouting between two pipelines, further exacerbating the problem of uneven grout filling.

[0003] Furthermore, after traditional grouting construction, incomplete flushing of the pipelines leads to residual grout forming scale on the inner walls, affecting the reuse of subsequent equipment. Additionally, the lack of dedicated waste grout collection devices results in the direct discharge of flushing wastewater and residual grout, causing environmental pollution and resource waste. Moreover, the precast slab grouting pipelines are not pre-treated before construction, allowing residual dust, debris, and moisture within the pipelines to mix with the grout, reducing its performance and affecting the grouting bonding effect.

[0004] In view of the above-mentioned shortcomings, the designer has actively researched and innovated in order to create an intelligent grouting trolley and a grouting method using the grouting trolley, so as to make it more industrially valuable. Summary of the Invention

[0005] To address the aforementioned technical problems, the present invention aims to provide an intelligent grouting trolley and a grouting method using the grouting trolley.

[0006] The present invention provides an intelligent grouting trolley, comprising a trolley body, a grouting machine and a vacuum pump installed inside the trolley body, the grouting machine being connected to a docking head via two pipelines, the docking head being connected to two sets of grouting pipelines inside the precast slab, the other side of the grouting pipelines inside the precast slab being connected via a vacuum pipe, a three-way valve being installed on the docking head, the three-way valve being connected to the vacuum pump via a pipeline.

[0007] This intelligent grouting trolley comprises a main body integrating various functional components. Inside the trolley body is a grouting machine responsible for grout delivery and a vacuum pump for pipeline vacuum treatment. The grouting machine is connected to a connector with multi-channel docking function through two independent pipelines. This connector can achieve precise matching and connection with two sets of grouting pipelines inside the precast slab. The two sets of grouting pipelines in the precast slab are connected through a vacuum tube on the side away from the connector. The connector is equipped with a three-way valve for switching the on / off state of the pipeline. The three-way valve is connected to the vacuum pump through a dedicated pipeline, thereby realizing the vacuum pump's vacuum extraction function of the precast slab grouting pipeline.

[0008] Furthermore, the connector is connected to the waste slurry collection tank via a three-way valve and pipeline.

[0009] The three-way valve on the connector forms a connection with the waste slurry collection tank through a dedicated pipeline. With the help of the three-way valve's channel switching function, the residual waste slurry in the pipeline after grouting operation can be guided to the waste slurry collection tank, realizing the centralized collection and standardized treatment of waste slurry.

[0010] Furthermore, a pressure gauge is installed on the connecting pipe of the vacuum pump.

[0011] A barometer is installed on the connecting pipeline of the vacuum pump. The barometer can provide real-time feedback on the air pressure status in the pipeline, providing an intuitive reference for monitoring the effect of the vacuum operation and helping to ensure the stable construction of the pipeline vacuum environment.

[0012] A grouting method using an intelligent grouting trolley. S1: Connect the two sets of grouting pipes and vacuum pipes of the joint to the precast slab, and monitor the initial air pressure in the pipes through the air pressure gauge of the vacuum pump. S2: Start the vacuum pump to evacuate the grouting pipeline of the precast slab to a pressure of ≤-0.08MPa and maintain the vacuum state for 5 minutes; S3: Start the grouting machine and simultaneously grout the precast slab through two pipelines, controlling the grouting pressure to be 0.5-0.7MPa; S4: When the homogeneous slurry without bubbles is discharged from the vacuum tube, close the valve of the vacuum tube, continue to hold the pressure for 2 minutes, and then stop the grouting machine.

[0013] The grouting method using an intelligent grouting trolley first connects the two sets of grouting pipes and vacuum pipes of the joint and the precast slab accordingly. The initial air pressure in the pipes is obtained using the pressure gauge of the vacuum pump to complete the pre-operation status check. Then, the vacuum pump is started to perform a vacuum extraction operation on the grouting pipes of the precast slab and maintain the corresponding vacuum state to create a bubble-free working environment for subsequent grout filling. Next, the grouting machine is started to simultaneously deliver grout to the grouting pipes of the precast slab through two pipes to ensure that the grout can evenly cover all areas inside the pipes. When a homogeneous grout without bubbles is observed to be discharged from the vacuum pipe, the valve of the vacuum pipe is closed. The pressure is maintained to further ensure the dense filling of the grout. Finally, the grouting machine is stopped to achieve high-quality grouting operation of the precast slab grouting pipes and improve the integrity and stability of the grout filling in the pipes.

[0014] Furthermore, in step S2, during the vacuuming process, residual air in the pipeline is discharged in real time through a three-way valve, and the operating power of the vacuum pump gradually decreases as the pipeline air pressure decreases.

[0015] During the vacuuming process, the three-way valve on the connector is used to regulate the pipeline passage and discharge the air remaining in the pipeline in real time. This prevents air from accumulating in the pipeline and affecting the vacuum effect. At the same time, the operating power of the vacuum pump will be gradually reduced as the air pressure inside the pipeline changes. This can achieve energy saving and consumption reduction of the equipment while ensuring the vacuuming effect, and ensure that the vacuuming operation is carried out efficiently and smoothly.

[0016] Furthermore, in step S3, the grouting flow difference between the two pipelines of the grouting machine is controlled to be ≤5%, and the pipeline pressure is fed back in real time by the pressure sensor of the joint during the grouting process. When the pressure fluctuation exceeds ±0.05MPa, the output power of the grouting machine is automatically adjusted.

[0017] During the grouting process, the difference in grout flow rate between the two delivery pipelines of the grouting machine is precisely controlled to ensure that the grouting rates of the two pipelines remain synchronized. This avoids dead zones in the grouting pipeline caused by uneven flow rates. At the same time, pressure sensors on the connectors are used to monitor and provide data feedback on the grouting pressure in the pipeline in real time. When the monitored pressure fluctuation exceeds the preset range, the system automatically adjusts the output power of the grouting machine to maintain stable grouting pressure and ensure that the grout can be filled into the grouting pipeline of the precast slab evenly and densely.

[0018] Furthermore, step S5 is included: after grouting is completed, the pipeline is switched through a three-way valve, the grouting machine is started to flush the pipeline with clean water, the flushing fluid is introduced into the waste slurry collection tank through the pipeline, and all equipment is turned off after flushing is completed.

[0019] After the grouting operation is completed, a pipeline flushing step is added. The pipeline route is adjusted by switching the three-way valve on the connector. Then, the grouting machine is started to flush the pipeline with clean water. The residual grout in the pipeline is introduced into the waste grout collection tank along with the flushing liquid, so as to realize the centralized collection of waste grout and the cleaning treatment of the pipeline. This prevents the residual grout from drying in the pipeline and affecting the subsequent use of the equipment. After the flushing operation is completed, all related equipment is shut down.

[0020] Furthermore, in step S5, the flushing process is carried out in two stages: first, room temperature clean water is introduced to flush away residual slurry in the pipeline, and second, an aqueous solution containing 0.5% corrosion inhibitor is introduced to circulate and flush for 3 minutes to avoid scaling on the inner wall of the pipeline.

[0021] The above-mentioned pipeline flushing process adopts a phased operation method. First, room temperature clean water is introduced to perform an initial flushing of the pipeline interior, thereby quickly removing most of the residual slurry in the pipeline. Then, an aqueous solution with added corrosion inhibitor is introduced to carry out a circulating flushing operation. The circulating flushing for a set time further cleans the inner wall of the pipeline, preventing residual slurry from adhering to the inner wall of the pipeline and forming scale. At the same time, the corrosion inhibitor protects the inner wall of the pipeline from corrosion and extends the service life of the pipeline.

[0022] Furthermore, before step S1, a pretreatment step for the precast slab grouting pipeline is included: compressed air is introduced into the pipeline to purge for 1 minute to remove dust and debris from the pipeline, and then dry nitrogen is introduced to keep the pipeline dry.

[0023] Before officially starting the pipeline connection operation, the grouting pipeline of the precast slab must be pre-treated. First, compressed air is introduced into the pipeline to purge it and thoroughly remove the dust and debris accumulated inside the pipeline. Then, dry nitrogen is introduced to keep the inside of the pipeline dry and clean, so as to avoid impurities and moisture from adversely affecting the grout performance and filling effect of the subsequent grouting operation.

[0024] By means of the above-described solution, the present invention has at least the following advantages: I. Significantly Improved Grouting Quality: The trolley integrates a grouting machine and a vacuum pump, with precise connection between the joint and the grouting pipeline of the precast slab. A three-way valve enables switching between vacuuming and grouting, and a barometer monitors the vacuum level in real time, effectively removing air from the pipeline and preventing defects such as air bubbles and voids during grout filling. The dual-pipeline synchronous grouting design, combined with precise flow difference control, real-time feedback from pressure sensors, and automatic adjustment of the grouting machine power, ensures stable grouting pressure and uniform grout filling, significantly improving the density and structural connection strength of the precast slab grouting pipeline and extending the service life of the project.

[0025] II. Improved operational efficiency and intelligence: The integrated design of the equipment simplifies the pipeline connection process and reduces manual operation. Functions such as the vacuum pump power adaptive adjustment with air pressure and the intelligent control of grouting pressure and flow reduce reliance on human experience, avoid human error, and realize the automation and precision of grouting operations, significantly improving construction efficiency. The setting of pretreatment steps and staged flushing processes eliminates the need for additional auxiliary equipment, further optimizing the continuity of the operation process.

[0026] III. Extended Equipment Service Life and Enhanced Environmental Friendliness: The staged flushing process after grouting involves step-by-step treatment with room temperature clean water and an aqueous solution containing corrosion inhibitors. This not only thoroughly removes residual grout from the pipelines, preventing scale buildup on the inner walls, but also protects the pipelines with the help of corrosion inhibitors, extending the reuse life of the equipment and pipelines. The waste grout collection tank enables centralized collection of waste grout and flushing fluid, avoiding environmental pollution caused by indiscriminate discharge, and meeting the industrial development needs of green construction.

[0027] IV. Wide Applicability and High Practicality: The equipment structure of this invention is simple and compact, and the pipeline connection is flexible, adapting to the grouting requirements of precast slabs of different specifications. The process steps cover the entire process, including pretreatment, vacuuming, synchronous grouting, pressure holding and grout retention, and segmented flushing. It takes into account the grouting quality requirements under different engineering scenarios. It is not only suitable for precast slab grouting construction in the fields of bridges and buildings, but can also be extended to other engineering scenarios that require high-pressure grouting, and has significant industrial utilization value and promotion prospects.

[0028] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show a certain embodiment of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of the present invention.

[0031] In the diagram: 1. Main body of the trolley; 2. Vacuum pump; 3. Vacuum pump; 4. Connecting joint; 5. Precast slab; 6. Vacuum pipe; 7. Waste slurry collection tank. Detailed Implementation

[0032] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0033] See Figure 1 A preferred embodiment of the present invention provides an intelligent grouting trolley, comprising a trolley body 1, a grouting machine 2 and a vacuum pump 3 disposed within the trolley body 1, the grouting machine 2 being connected to a connector 4 via two pipelines, the connector 4 being connected to two sets of grouting pipelines within a precast slab 5, the other side of the grouting pipelines within the precast slab 5 being connected via a vacuum pipe 6, a three-way valve being disposed on the connector 4, and the three-way valve being connected to the vacuum pump 3 via a pipeline.

[0034] See Figure 1 This intelligent grouting trolley operates by first precisely connecting the connector 4 to the two sets of grouting pipes inside the precast slab 5, while ensuring effective connection between the other side of the grouting pipes inside the precast slab 5 and the vacuum pipe 6. Then, using the three-way valve on the connector 4, the connector 4 is connected to the vacuum pump 3 inside the trolley body 1 via pipes. Starting the vacuum pump 3 allows for vacuuming of the grouting pipes of the precast slab 5. Once the vacuuming reaches the preset requirements, the three-way valve is switched again to connect the two pipes of the grouting machine 2 inside the trolley body 1 to the connector 4, and the grouting machine 2 is started. Grout can be simultaneously delivered to the grouting pipeline of the precast slab 5 through two pipelines. The integrated trolley body 1 integrates the grouting machine 2 and the vacuum pump 3, which greatly simplifies the layout process of construction equipment. The design of the connector 4 with a three-way valve realizes the convenient switching between the two operation modes of vacuuming and grouting without the need for repeated disassembly and assembly of pipelines. The dual-pipeline grouting method, combined with the vacuum pipe 6 connected to the other side of the grouting pipeline of the precast slab 5, can make the grout fill the grouting pipeline of the precast slab 5 more evenly, effectively reduce the residual air bubbles, and improve the overall quality and efficiency of grouting construction.

[0035] Furthermore, the connector 4 is connected to the waste slurry collection tank 7 via a three-way valve and pipeline.

[0036] After the grouting operation is completed, switch the three-way valve passage on the connector 4 to establish a connection between the connector 4 and the waste slurry collection tank 7 through the pipeline. Then, use relevant equipment to flush the grouting pipeline, so that the residual waste slurry in the pipeline flows into the waste slurry collection tank 7 along with the flushing liquid through the connector 4 and the pipeline for centralized collection. With the passage switching function of the three-way valve, the waste slurry collection operation can be realized without the need to add additional connecting pipelines. The waste slurry collection tank 7 can uniformly collect the waste slurry generated by flushing, avoiding the environmental pollution caused by the random discharge of waste slurry. It also facilitates the subsequent centralized treatment or resource utilization of waste slurry, simplifies the finishing procedures after the grouting operation, and improves the convenience and environmental friendliness of the overall construction.

[0037] Furthermore, a barometer is installed on the connecting pipe of the vacuum pump 3.

[0038] During vacuuming operations, a barometer is installed on the connecting pipeline of the vacuum pump 3. As the vacuum pump 3 is started to vacuum the grouting pipeline of the precast slab, the barometer can monitor and report the changes in air pressure in the pipeline in real time. The operators can judge whether the vacuum state in the pipeline meets the operational requirements based on the value displayed by the barometer. Through the real-time monitoring of the barometer, the operation process of the vacuum pump 3 can be accurately controlled, avoiding the formation of air bubbles during grout filling due to insufficient vacuuming, and also preventing excessive vacuuming that would waste equipment energy. This ensures the stability and accuracy of the vacuuming operation and lays a good foundation for the high-quality development of subsequent grouting operations.

[0039] A grouting method using an intelligent grouting trolley. S1: Connect the two sets of grouting pipes and vacuum pipes 6 of the connector 4 and the precast slab 5 respectively, and monitor the initial air pressure in the pipes through the pressure gauge of the vacuum pump 3. S2: Start the vacuum pump 3 to evacuate the grouting pipeline of the precast slab 5 to a pressure of ≤-0.08MPa and maintain the vacuum state for 5 minutes; S3: Start grouting machine 2 and simultaneously grout the precast slab 5 through two pipelines, controlling the grouting pressure to be 0.5-0.7MPa; S4: When the homogeneous slurry without bubbles is discharged from the vacuum tube 6, close the valve of the vacuum tube 6, continue to hold the pressure for 2 minutes, and then stop the grouting machine 2.

[0040] This grouting method using an intelligent grouting trolley begins with the precise connection of the two sets of grouting pipes and vacuum pipes 6 between the connector 4 and the precast slab 5. The initial air pressure within the pipes is monitored and recorded in real time by the pressure gauge of the vacuum pump 3. After connection and initial inspection, the vacuum pump 3 is started to vacuum the grouting pipes of the precast slab 5 until the pressure gauge shows an air pressure ≤-0.08MPa. This vacuum state is then maintained for 5 minutes to ensure sufficient air removal. Next, the grouting machine 2 is started to simultaneously deliver grout to the grouting pipes of the precast slab 5 through both pipes. During the process, the grouting pressure is strictly controlled within the range of 0.5-0.7MPa. Grouting continues until a uniform, bubble-free grout is observed exiting from the vacuum pipe 6. When the grout is applied, the valve of vacuum tube 6 is closed, and the grouting pressure is maintained for 2 minutes to ensure dense filling of the grout. Finally, the grouting machine 2 is stopped to complete the entire grouting operation. The joint 4 achieves precise connection of multiple pipelines. Combined with the monitoring of the initial air pressure by the barometer and the vacuum treatment by the vacuum pump 3, the problem of air bubbles remaining during grout filling is effectively avoided. The two pipelines are grouted simultaneously and the grouting pressure is precisely controlled, ensuring the uniformity and density of grout filling in the grouting pipeline of the precast slab 5. The exhaust monitoring of vacuum tube 6 and the subsequent pressure holding operation further ensure the grouting quality. The overall process logic is clear and the operation is standardized, which greatly reduces the impact of human operation error on the grouting effect and improves the construction efficiency and the connection strength and durability of the engineering structure.

[0041] Furthermore, in step S2, during the vacuuming process, residual air in the pipeline is discharged in real time through a three-way valve, and the operating power of the vacuum pump 3 gradually decreases as the pipeline air pressure decreases.

[0042] In step S2 of the grouting method, when the vacuum pump 3 is started to perform vacuuming operation on the grouting pipeline of the precast slab 5, the pipeline passage is adjusted in real time by the three-way valve on the connector 4 to continuously discharge the residual air in the pipeline, ensuring that air does not accumulate in the pipeline. At the same time, as the pipeline air pressure gradually decreases during the operation of the vacuum pump 3, the operating power of the vacuum pump 3 is gradually reduced until the air pressure in the pipeline reaches the preset requirement and maintains a vacuum state. The advantage of this is that the real-time venting function of the three-way valve can further improve the discharge efficiency of residual air in the pipeline, avoiding the impact of residual air on the subsequent grouting quality. The design of the vacuum pump 3 gradually reducing the operating power as the air pressure decreases not only ensures the effect of the vacuuming operation, but also avoids the energy waste caused by excessive power. At the same time, it makes the vacuuming process more stable, reduces the pipeline air pressure fluctuation caused by constant power, and lays a more stable vacuum foundation for the uniform filling of grout in the future.

[0043] Furthermore, in step S3, the grouting flow difference between the two pipelines of the grouting machine 2 is controlled to be ≤5%, and the pipeline pressure is fed back in real time by the pressure sensor of the connector 4 during the grouting process. When the pressure fluctuation exceeds ±0.05MPa, the output power of the grouting machine 2 is automatically adjusted.

[0044] In step S3 of the grouting method, after starting the grouting machine 2, grout is synchronously delivered to the grouting pipeline of the precast slab 5 through its two pipelines. During the process, the grouting flow difference between the two pipelines is strictly controlled to ≤5%. At the same time, the pressure sensor on the connector 4 monitors the grouting pressure in the pipeline in real time and feeds back the data. When the pressure sensor detects that the pipeline pressure fluctuation exceeds ±0.05MPa, the system automatically adjusts the output power of the grouting machine 2 to calibrate the pressure. The precise control of the grouting flow difference between the two pipelines ensures the synchronicity of grout delivery and avoids dead corners or grout accumulation in the grouting pipeline of the precast slab 5 due to uneven flow. The real-time feedback of the pressure sensor and the automatic adjustment function of the output power of the grouting machine 2 can quickly respond to pressure fluctuations, maintain the stability of the grouting pressure in the pipeline, reduce errors caused by human intervention, and thus ensure the uniformity and density of grout filling, improving the overall quality and reliability of the grouting operation.

[0045] Furthermore, step S5 is included: after grouting is completed, the pipeline is switched through the three-way valve, the grouting machine 2 is started to flush the pipeline with clean water, and the flushing liquid is introduced into the waste slurry collection tank 7 through the pipeline. After flushing is completed, all equipment is turned off.

[0046] After the grouting operation is completed in step S4, the pipeline path is switched by the three-way valve on the connector 4, so that the grouting machine 2 and the grouting pipeline form a flushing loop. Then, the grouting machine 2 is started to introduce clean water into the pipeline. As the clean water flows in the pipeline, it flushes away the residual grout. The flushing fluid carrying the residual grout is continuously transported through the pipeline and finally introduced into the waste grout collection tank 7. After the pipeline is cleaned, the grouting machine 2 and related equipment are turned off, completing the entire flushing finishing process. With the pipeline switching function of the three-way valve, the flushing operation can be carried out quickly without additional disassembly or connection of the pipeline. The operation is convenient and efficient. The grouting machine 2 serves as the flushing power source and does not require additional special flushing equipment, reducing construction costs. Clean water flushing can effectively remove residual grout in the pipeline, preventing the grout from drying and clogging the pipeline or affecting the subsequent use of the equipment. The waste grout collection tank 7 collects the flushing fluid in a centralized manner, realizing the standardized treatment of waste grout and avoiding environmental pollution. The overall process further improves the closed loop of the grouting operation and enhances the convenience and environmental friendliness of construction.

[0047] Furthermore, in step S5, the flushing process is carried out in two stages: first, room temperature clean water is introduced to flush away residual slurry in the pipeline, and second, an aqueous solution containing 0.5% corrosion inhibitor is introduced to circulate and flush for 3 minutes to avoid scaling on the inner wall of the pipeline.

[0048] In step S5 of the grouting method, the flushing process is carried out in two stages. First, room temperature clean water is introduced into the pipeline through the grouting machine 2 to flush away the residual grout on the inner wall of the pipeline. After the initial flushing, an aqueous solution containing 0.5% corrosion inhibitor is introduced, and the solution is circulated in the pipeline for 3 minutes. After flushing, the relevant equipment is turned off. The two-stage flushing design can achieve deep cleaning of the pipeline. The first room temperature clean water flushing can quickly remove most of the residual grout, and the second circulating aqueous solution containing corrosion inhibitor can further clean the fine grout residues adhering to the inner wall of the pipeline, effectively preventing scale formation on the inner wall of the pipeline. At the same time, the addition of corrosion inhibitor can protect the pipeline and extend its service life. The staged flushing method is more thorough than a single flushing, providing a good guarantee for the subsequent reuse of equipment and improving the continuity of the entire grouting operation and the reusability of the equipment.

[0049] Furthermore, before step S1, a pretreatment step for the grouting pipeline of the precast slab 5 is also included: compressed air is introduced into the pipeline to purge for 1 minute to remove dust and debris from the pipeline, and then dry nitrogen is introduced to keep the pipeline dry.

[0050] Before step S1 of the grouting method, a pretreatment operation is performed on the grouting pipeline of the precast slab 5. First, compressed air is introduced into the grouting pipeline of the precast slab 5 and continuously purged for 1 minute. The impact force of the compressed air removes the dust and debris accumulated in the pipeline. After cleaning the debris, dry nitrogen is introduced into the grouting pipeline of the precast slab 5 to keep the pipeline dry. The pretreatment step effectively removes dust, debris and other interfering substances from the grouting pipeline of the precast slab 5 by purging with compressed air, avoiding these impurities from mixing with the grout and affecting the grout performance and filling effect during subsequent grouting. The introduction of dry nitrogen ensures that the pipeline is dry and free of moisture, preventing moisture from causing the grout to coagulate or deteriorate. This creates a clean and dry pipeline environment for the subsequent connection of the joint 4 and grouting operation, ensuring the stability and reliability of the grouting quality from the source.

[0051] The working principle of this invention is as follows: I. Preprocessing stage Before formally connecting the pipelines, a pretreatment operation is performed on the grouting pipeline of the precast slab 5: First, compressed air is introduced into the grouting pipeline of the precast slab 5 and continuously purged for 1 minute. The airflow impact force of the compressed air removes the dust and debris accumulated in the pipeline. After cleaning the debris, dry nitrogen is introduced into the pipeline to keep the inside of the grouting pipeline of the precast slab 5 dry, creating a clean and dry basic environment for subsequent grouting operations.

[0052] II. Core Grouting Process Pipeline connection and initial inspection step S1: Connect the two sets of grouting pipelines and vacuum pipes 6 of the connector 4 and the precast slab 5 precisely to ensure that each interface is well sealed; after the connection is completed, connect the air pressure gauge on the pipeline through the vacuum pump 3 to monitor and record the initial air pressure in the pipeline in real time, and complete the status check before operation.

[0053] Vacuuming operation step S2: Start the vacuum pump 3 to vacuum the grouting pipeline of the precast slab 5. During the process, the pipeline passage is adjusted in real time by using the three-way valve on the connector 4 to continuously discharge the residual air in the pipeline and avoid air accumulation. At the same time, the operating power of the vacuum pump 3 is gradually reduced as the pipeline air pressure decreases until the pressure gauge shows that the air pressure in the pipeline reaches ≤-0.08MPa. Then, maintain this vacuum state for 5 minutes to ensure that the air in the pipeline is fully discharged.

[0054] Synchronous grouting operation step S3: Start the grouting machine 2 and synchronously deliver grout to the grouting pipeline of the precast slab 5 through two independent pipelines. Strictly control the grouting flow difference between the two pipelines to ≤5% to ensure the synchronicity of grout delivery. During the grouting process, the pressure sensor on the connector 4 provides real-time feedback on the pipeline pressure. When the pressure fluctuation exceeds ±0.05MPa, the system automatically adjusts the output power of the grouting machine 2 to maintain the grouting pressure stable within the range of 0.5-0.7MPa.

[0055] S4: Continue grouting until a homogeneous grout without air bubbles is observed to be discharged from the vacuum tube 6. At this point, close the valve of the vacuum tube 6 and continue to maintain the current grouting pressure for 2 minutes to ensure that the grout is densely filled in the pipeline and to avoid gaps or looseness. Then stop the grouting machine 2.

[0056] III. Subsequent Rinsing Stage Step S5 After the grouting operation is completed, the pipeline path is switched by the three-way valve on the connector 4, and the grouting machine 2 is started to carry out staged flushing: the first flushing is to introduce room temperature clean water, which washes away most of the grout remaining on the inner wall of the pipeline; after the first flushing is completed, the second flushing is to introduce an aqueous solution containing 0.5% corrosion inhibitor, which is then circulated in the pipeline for 3 minutes to further clean up fine grout residue; all flushing fluid generated is introduced into the waste grout collection tank 7 through the pipeline for centralized collection. After the flushing is completed, all related equipment is shut down to complete the closed loop of the entire grouting operation.

[0057] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other. Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An intelligent grouting trolley, comprising a trolley body (1), characterized in that: The trolley body (1) is equipped with a grouting machine (2) and a vacuum pump (3). The grouting machine (2) is connected to the connector (4) through two pipelines. The connector (4) is connected to two sets of grouting pipelines in the precast slab (5). The other side of the grouting pipeline in the precast slab (5) is connected through a vacuum pipe (6). A three-way valve is installed on the connector (4). The three-way valve is connected to the vacuum pump (3) through a pipeline.

2. The intelligent grouting trolley according to claim 1, characterized in that: The connector (4) is connected to the waste slurry collection tank (7) via a three-way valve and pipeline.

3. The intelligent grouting trolley according to claim 1 or 2, characterized in that: A barometer is installed on the connecting pipe of the vacuum pump (3).

4. A grouting method using the intelligent grouting trolley as described in any one of claims 1-3, characterized in that: S1: Connect the two sets of grouting pipes and vacuum pipes (6) of the joint (4) and the precast slab (5) respectively, and monitor the initial air pressure in the pipes through the barometer of the vacuum pump (3); S2: Start the vacuum pump (3) to evacuate the grouting pipeline of the precast slab (5) to a pressure of ≤-0.08MPa and maintain the vacuum state for 5 minutes; S3: Start the grouting machine (2) and grout the precast slab (5) through two pipelines simultaneously, controlling the grouting pressure to be 0.5-0.7MPa; S4: When the homogeneous slurry without bubbles is discharged from the vacuum tube (6), close the valve of the vacuum tube (6), continue to hold the pressure for 2 minutes, and then stop the grouting machine (2).

5. The grouting method according to claim 4, characterized in that: In step S2, the residual air in the pipeline is discharged in real time through the three-way valve during the vacuuming process, and the operating power of the vacuum pump (3) gradually decreases as the pipeline air pressure decreases.

6. The grouting method according to claim 4, characterized in that: In step S3, the grouting flow difference between the two pipelines of the grouting machine (2) is controlled to be ≤5%, and the pipeline pressure is fed back in real time by the pressure sensor of the connector (4) during the grouting process. When the pressure fluctuation exceeds ±0.05MPa, the output power of the grouting machine (2) is automatically adjusted.

7. The grouting method according to claim 4, characterized in that: It also includes step S5: After grouting is completed, the pipeline is switched through the three-way valve, the grouting machine (2) is started and clean water is introduced into the pipeline for rinsing. The rinsing liquid is introduced into the waste slurry collection tank (7) through the pipeline. After rinsing is completed, all equipment is turned off.

8. The grouting method according to claim 7, characterized in that: In step S5, the flushing process is carried out in two stages: first, room temperature clean water is introduced to flush away residual slurry in the pipeline; second, an aqueous solution containing 0.5% corrosion inhibitor is introduced to circulate and flush for 3 minutes to prevent scale buildup on the inner wall of the pipeline.

9. The grouting method according to claim 4, characterized in that: Before step S1, there is also a pretreatment step for the grouting pipeline of the precast slab (5): introduce compressed air into the pipeline to blow for 1 minute to remove dust and debris from the pipeline, and then introduce dry nitrogen to keep the pipeline dry.

Images