A bridge and tunnel grouting reinforcement device with negative pressure anti-backflow structure

Abstract

This invention relates to the field of bridge and tunnel grouting reinforcement technology, and discloses a bridge and tunnel grouting reinforcement device with a negative pressure anti-backflow structure. The device includes a grouting pump, a grouting head, a negative pressure pump, and an anti-backflow component. The grouting pump is connected to the grouting head through a first grout pipe. The anti-backflow component is connected in series in the first grout pipe and includes a connecting pipe and a negative pressure sleeve sleeved outside the connecting pipe. A flow-suppressing cavity is formed between the outer wall of the connecting pipe and the inner wall of the negative pressure sleeve. Multiple sets of air holes are uniformly opened axially on the wall of the connecting pipe, penetrating the pipe wall to connect the flow-suppressing cavity and the inner cavity of the connecting pipe. The negative pressure pump is connected to the flow-suppressing cavity through a pipeline. A solenoid valve is installed between the grouting pump and the anti-backflow component. This invention uses the negative pressure pump to draw water from the flow-suppressing cavity, forming a local low-pressure zone on the pipe wall through the air holes of the connecting pipe, thereby blocking the pressure transmission of the backflowing grout and providing response time for the solenoid valve to close, thus improving the timeliness of the anti-backflow mechanism.

Description

Technical Field

[0001] This invention relates to the field of bridge and tunnel grouting reinforcement technology, and more specifically, to a bridge and tunnel grouting reinforcement device with a negative pressure anti-backflow structure. Background Technology

[0002] In the process of reinforcing the rock mass of bridges and tunnels, sealing the fissures in the surrounding rock, and preventing seepage in underground engineering, in order to improve the integrity and stability of the structure, it is usually necessary to use grouting equipment to inject cement-based grout into the rock fissures to achieve fissure filling and structural reinforcement.

[0003] However, existing grouting reinforcement devices mostly rely on mechanical one-way valves to prevent backflow, lacking a negative pressure backflow prevention structure. This leads to the grout flowing back quickly due to the high pressure inside the rock mass at the end of grouting or the moment of sudden pressure change. The one-way valve's delayed response can cause grout backflow, affecting the grouting quality, resulting in uneven reinforcement effects, increased construction costs and equipment failure rate, and making it difficult to meet the requirements for stable tunnel grouting construction. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a bridge and tunnel grouting reinforcement device with a negative pressure anti-backflow structure. This solves the technical problem that existing grouting devices often rely on mechanical one-way valves to prevent backflow, which can easily lead to grout backflow and poor reinforcement effect during sudden pressure changes.

[0005] The purpose and effectiveness of the bridge and tunnel grouting reinforcement device with negative pressure anti-backflow structure of the present invention are achieved by the following specific technical means:

[0006] This invention provides a bridge and tunnel grouting reinforcement device with a negative pressure anti-backflow structure, comprising:

[0007] Grouting pump, grouting head, negative pressure pump and anti-backflow component;

[0008] The grouting pump is connected to the grouting head through a first grout pipe;

[0009] The anti-backflow component is connected in series in the first slurry pipe. It includes a connecting pipe and a negative pressure sleeve sleeved on the outside of the connecting pipe. A flow suppression cavity is formed between the outer wall of the connecting pipe and the inner wall of the negative pressure sleeve. Multiple sets of air holes are uniformly opened along the axial direction on the pipe wall of the connecting pipe. The air holes penetrate the pipe wall to connect the flow suppression cavity with the inner cavity of the connecting pipe.

[0010] The negative pressure pump is connected to the flow suppression chamber via a pipeline;

[0011] A solenoid valve is provided between the grouting pump and the anti-backflow component. The solenoid valve is connected in series in the first grout pipe to block the grout backflow.

[0012] As a preferred embodiment, the device has a grouting working state and a negative pressure anti-backflow state;

[0013] During the grouting operation, the grouting pump operates, driving the grout to flow through the inner cavity of the connecting pipe;

[0014] In the negative pressure anti-backflow state, the negative pressure pump operates to draw air into the flow suppression chamber. The airflow flows from the air hole into the flow suppression chamber through the inner cavity of the connecting pipe, forming a local low-pressure zone on the inner wall surface of the connecting pipe. This blocks the pressure transmission of the backflow slurry, providing response time for the solenoid valve to close, thus achieving the blocking of slurry backflow.

[0015] The pores have a diameter smaller than the minimum particle size of solid particles in the slurry. The pores only allow gas to pass through while blocking the slurry from entering the flow suppression cavity, so as to maintain the continuity of the local low-pressure zone.

[0016] As a preferred embodiment, the device further includes:

[0017] A pressure stabilizing tank, wherein the outlet of the pressure stabilizing tank is connected to the inlet of the negative pressure pump through a first air guide pipe, for buffering pressure fluctuations of the negative pressure pump;

[0018] A flow regulating valve is connected in series in the first air guide pipe and is used to regulate the negative pressure state in the first air guide pipe.

[0019] A negative pressure sensor is installed at the end of the first air duct near the pressure stabilizing tank, with its detection end extending into the first air duct, for monitoring the negative pressure state inside the first air duct.

[0020] As a preferred embodiment, the pressure stabilizing tank is connected to:

[0021] The gas source distributor has an outlet end connected to one of the inlet ends of the pressure stabilizing tank via a second air guide pipe. The multiple inlet ends of the gas source distributor are all connected to negative pressure branch pipes, forming multiple sets of first negative pressure pipelines, which are used to create negative pressure at the cracks to assist the slurry in filling the cracks.

[0022] The other set of air inlets of the pressure stabilizing tank is connected to the air outlet of the negative pressure sleeve through a third air guide pipe to form a second negative pressure pipeline, which is used to provide negative pressure to the flow suppression cavity and buffer pressure fluctuations.

[0023] As a preferred embodiment, the outlet of each negative pressure branch pipe is connected to the inlet of the gas source distributor via an electric valve. The electric valve is used to independently control the gas flow of the corresponding negative pressure branch pipe, so that each negative pressure branch pipe forms a differentiated negative pressure.

[0024] The differentiated negative pressure is used to match the grouting requirements of fractures of different depths, so as to realize the layered grouting and diffusion of fractures of multiple depths.

[0025] As a preferred embodiment, the anti-backflow component further includes:

[0026] Two sets of connecting flanges are connected in series at both ends of the connecting pipe to the first slurry pipe via the two sets of connecting flanges.

[0027] Two sets of sealing elements are respectively sleeved on the connecting pipe and respectively embedded in the openings at both ends of the negative pressure sleeve to seal the two ends of the flow suppression cavity.

[0028] As a preferred embodiment, a filter sleeve is provided inside the flow suppression cavity, with both ends of the filter sleeve respectively embedded in the two sets of sealing elements, for filtering the airflow discharged from the negative pressure sleeve.

[0029] In a preferred embodiment, the solenoid valve is located on the side of the anti-backflow assembly closer to the grouting pump, and the outlet end of the solenoid valve is connected to the inlet end of the connecting pipe of the anti-backflow assembly via a U-shaped pipe;

[0030] A silencer and a filter are connected in series at the outlet of the negative pressure pump to treat the gas discharged from the negative pressure pump.

[0031] As a preferred embodiment, the discharge end of the grouting head is connected to a grouting hose to assist the grouting head in injecting grout. A pressure sensor is installed on the top of the grouting head, and the detection end of the pressure sensor extends into the grouting head to detect the grouting pressure and trigger a backflow judgment.

[0032] The discharge end of the grouting pump is connected in series with the solenoid valve, the U-shaped pipe, the anti-backflow component and the feed end of the grouting head through the first grout pipe to form a grouting pipeline for grouting and to prevent grout backflow.

[0033] As a preferred embodiment, the device further includes:

[0034] A mobile mounting frame, on which the grouting pump can be detachably mounted;

[0035] The mounting housing is mounted on the movable mounting frame. The top of the mounting housing is a semi-open structure. The negative pressure pump is mounted on the movable mounting frame and located inside the mounting housing. The anti-backflow component is located inside the mounting housing. The grouting head is detachably mounted on the mounting housing.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. This invention, through the coordinated design of the anti-backflow component and the negative pressure pump, enables the device to achieve dual anti-backflow through a local low-pressure zone and a solenoid valve, thereby improving the reliability of the anti-backflow device. The device can use the negative pressure pump to draw in the flow suppression chamber and form a local low-pressure zone on the pipe wall through the air hole of the connecting pipe to block the pressure transmission of the backflow slurry, providing response time for the solenoid valve to close, thus preventing slurry backflow and improving the timeliness and stability of the anti-backflow device.

[0038] 2. This invention independently adjusts the airflow of multiple sets of negative pressure branch pipes using multiple sets of electric valves, forming a matched differentiated negative pressure at different depths of the cracks to be filled. This guides the grout to penetrate into the cracks and fully fill them, while avoiding grout accumulation and waste in shallow cracks. It solves the problem of uneven filling with a single negative pressure, improves the filling efficiency and density of the multi-crack network, and enhances the construction flexibility and grouting reinforcement quality of the device.

[0039] 3. When using this device, the device can buffer negative pressure fluctuations and adjust the magnitude of negative pressure through the coordinated action of the pressure stabilizing tank and the flow regulating valve, ensuring a stable negative pressure supply and improving the grouting adaptability of the device. The device can monitor the grouting and negative pressure status and trigger backflow judgment in a timely manner through the linkage of the grouting head pressure sensor and the negative pressure sensor, making the device adjustable in terms of construction parameters and improving the practicality and construction safety of the device. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the assembly structure of the invention;

[0041] Figure 2 This is a schematic diagram of the invention's structure;

[0042] Figure 3 This is a schematic diagram of the connection structure between the grouting pump and the grouting head of the invention;

[0043] Figure 4 This is a schematic diagram of the connection structure of the grouting pump of the invention;

[0044] Figure 5 This is a schematic diagram of the connection structure of the negative pressure pump of the invention;

[0045] Figure 6 This is a schematic diagram of the connection structure of the gas source distributor of the invention;

[0046] Figure 7 This is a schematic diagram of the connection structure of the pressure stabilizing tank of the invention;

[0047] Figure 8 This is a schematic diagram of the anti-backflow component of the invention;

[0048] Figure 9 This is a cross-sectional view of the anti-backflow component of the invention;

[0049] Figure 10 This is a flowchart of the grouting process of the invention;

[0050] Figure 11 It is this invention Figure 10 Schematic diagram of the structure of region A in the middle;

[0051] Figure 12 It is this invention Figure 10 Schematic diagram of the structure of region B in the middle;

[0052] Figure 13 This is a schematic diagram of the structure of the first and second air guide tubes of the invention;

[0053] Figure 14 This is a schematic diagram of the third air duct of the invention.

[0054] In the diagram, the correspondence between component names and their corresponding reference numerals is as follows:

[0055] 11. Grouting pump; 111. Solenoid valve; 112. U-tube; 12. Grouting head; 121. Grouting hose; 122. Pressure sensor; 123. Positioning sleeve; 124. Sealing sleeve; 13. Negative pressure pump; 131. Pressure stabilizing tank; 132. Flow regulating valve; 134. Silencer; 133. Negative pressure sensor; 135. Filter; 14. Movable mounting bracket; 15. Mounting housing; 21. Connecting pipe; 22. Negative pressure sleeve; 23. Flow suppression chamber; 24. Connecting flange; 25. Seal; 26. Filter sleeve; 31. Air source distributor; 32. Negative pressure branch pipe; 321. Electric valve; 322. Filter pipe; 323. Air nozzle. Detailed Implementation

[0056] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the technical solutions of the present invention, but should not be used to limit the scope of protection of the present invention.

[0057] Example:

[0058] like Figures 1 to 14As shown, the bridge and tunnel grouting reinforcement device with a negative pressure anti-backflow structure disclosed in this invention includes a movable mounting frame 14, a mounting shell 15, a grouting structure, a negative pressure structure, and an anti-backflow component. It should be noted that this invention also includes a control cabinet. The control core of the control cabinet can be a Kunlun Tongtai KG-HMI70-24MT model. The control cabinet is used for centralized control of the operation of each component. The movable mounting frame 14 provides a load-bearing foundation for the entire device. The mounting shell 15 is fixed to the top of the movable mounting frame 14 and is used to house the core components of the anti-backflow component. The grouting structure includes a grouting pump 11, a mixer, and a grouting head 12, used to achieve grout mixing and transportation. The negative pressure structure includes a negative pressure pump 13, a pressure stabilizing tank 131, an air source distributor 31, and a negative pressure branch pipe 32, used to provide stable and differentiated negative pressure. The anti-backflow component and a solenoid valve 111 are used to achieve dual anti-backflow. The entire device achieves multi-depth fissure layered grouting and anti-backflow, adapting to complex grouting scenarios in bridges and tunnels.

[0059] Specifically, this device adopts a modular structure, with each component working in concert. It specifically addresses the technical problems of uneven filling under single negative pressure and grout backflow in existing grouting devices. By guiding grout penetration through differentiated negative pressure and blocking grout backflow through a dual anti-backflow mechanism, it is suitable for strengthening rock fractures in bridges and tunnels, and is especially suitable for grouting and strengthening operations in multi-depth fracture networks.

[0060] The mobile mounting frame 14 serves as the load-bearing foundation for the entire device, including a frame, casters, straight wheels, and towing hooks. The frame is made of Q235B carbon steel and is welded together. Casters and straight wheels are symmetrically installed at the bottom, and towing hooks are fixed at both ends. It is used to install and fix all core components such as the grouting pump 11, negative pressure pump 13, mixer, and mounting shell 15, while realizing the movement and long-distance transportation of the device.

[0061] Specifically, the mobile mounting frame 14 has a rectangular overall structure and undergoes rust removal and anti-corrosion treatment to extend the service life of the device. The flat frame structure facilitates the installation layout of each component, ensuring even stress distribution after installation and stable operation of the device. The casters and straight wheels allow for movement of the device, facilitating adjustments to its construction position. The towing hook is used to connect to towing equipment, enabling long-distance transport of the device. Users can also secure the device by passing positioning pins through the towing hook, ensuring construction safety.

[0062] The mounting shell 15 serves as the protective and installation carrier for the device. It is made of cold-rolled steel plate and has an overall rectangular structure. The mounting shell 15 is detachably installed on the top of the mobile mounting frame 14 by bolts. It is used to accommodate components such as the anti-backflow component, solenoid valve 111, and U-tube 112, and at the same time provides an installation platform for top components such as the pressure tank 131 and the gas source distributor 31.

[0063] Specifically, cold-rolled steel sheets have good strength and toughness, and the bending and forming process is easy to process, which can adapt to the installation requirements of various components; the overall rectangular structure can make full use of space to accommodate internal components, while also facilitating users to carry out inspection and maintenance.

[0064] The top of the mounting housing 15 has a semi-open structure with a pre-drilled mounting hole at the front and through holes for pipes on both sides. Specifically, the semi-open structure at the top is used to avoid the pressure stabilizing tank 131, air source distributor 31 and other components installed at the top, while ensuring smooth exhaust of the negative pressure pump 13 and preventing gas accumulation. The mounting hole at the front is used to install the grouting head 12, and the through holes on both sides are used to run various pipes, making it convenient for users to inspect, maintain and clean the internal components of the mounting housing 15.

[0065] like Figures 2 to 4 As shown, the grouting structure is the core structure for realizing grout mixing and transportation. It includes a grouting pump 11, a mixer, a grouting head 12 and related pipelines. The grouting pump 11 and the mixer are detachably installed on the mobile mounting frame 14, and the grouting head 12 is detachably installed on the front end of the mounting shell 15. The three are connected by pipelines and work together to realize the mixing, filtration and injection of grout, adapting to the needs of various grout applications.

[0066] The grouting pump 11 can be a plunger-type grouting pump, which is detachably installed on the movable mounting frame 14 by bolts. The feed end is connected to the discharge end of the mixer, and the discharge end is connected to the first slurry pipe. It is used to deliver the slurry that is uniformly mixed by the mixer to the grouting head 12 under high pressure. In addition, a solenoid valve 111 is provided between the grouting pump 11 and the anti-backflow component. The solenoid valve 111 is connected in series in the first slurry pipe to block the backflow of slurry.

[0067] Specifically, the plunger-type structure ensures stable grout delivery and sufficient pressure, and can adapt to grouts of different viscosities to meet the grouting needs of multi-depth fractures. The detachable installation method facilitates the inspection, maintenance and replacement of the grouting pump 11, and the installation position facilitates connection with the internal pipelines of the mounting housing 15, reducing pipeline bends and ensuring smooth grout delivery.

[0068] The bottom of the grouting pump 11 is equipped with a rubber shock-absorbing pad. The feed end is connected to the mixer via a high-pressure rubber hose, and the discharge end is connected to the first slurry pipe via a high-pressure steel pipe.

[0069] Specifically, the vibration damping pad is used to reduce the vibration generated during the operation of the grouting pump 11, reduce the impact of vibration on other components of the device, and reduce operating noise; both high-pressure rubber hoses and high-pressure steel pipes have good pressure resistance, and the two ends of the pipelines are sealed by clamps or welding to ensure no grout leakage.

[0070] The mixer can be a vertical mixer, which can be detachably installed on the mobile mounting frame 14 by bolts. It is located next to the grouting pump 11, with a feed chamber at the top and a discharge port at the bottom. It is used to mix raw materials such as cement, sand, and water into a uniform slurry to provide qualified slurry for the grouting pump 11.

[0071] Specifically, the feed chamber facilitates the addition of raw materials and is not easily corroded by the slurry. Its volume is adapted to the rated capacity of the mixer, making it convenient to add raw materials in batches. The discharge port is connected to the feed end of the grouting pump 11 through a high-pressure rubber hose. A discharge valve is installed at the discharge port, and a stainless steel screen filter is installed on the pipeline between the two. The discharge valve is used to control the discharge and stop of the slurry, which is convenient for users to adjust according to the grouting progress. The screen filter is used to filter impurities and lumps in the slurry to avoid clogging the pipeline and ensure smooth slurry delivery.

[0072] The grouting head 12 can be made of stainless steel and can be detachably installed on the front end of the mounting shell 15 by bolts. The discharge end of the grouting head 12 is connected to the grouting hose 121 for injecting grout into the grouting hole. The discharge end of the grouting hose 121 is provided with a positioning sleeve 123 and a sealing sleeve 124. A pressure sensor 122 is installed on the top of the grouting head 12.

[0073] Specifically, the grouting head 12 has a rectangular structure, with a flange interface at its feed end. It is sealed to the first grout pipe through the flange, and an oil-resistant rubber gasket is placed between the flanges. It is fixed with bolts to ensure a sealed connection and prevent grout leakage. The detachable installation method facilitates the cleaning and replacement of the grouting head 12. The sealing groove and oil-resistant rubber gasket around the installation port further enhance the sealing between the grouting head 12 and the mounting shell 15.

[0074] The grouting hose 121 is a high-pressure rubber hose, which is sealed to the discharge end of the grouting head 12 by a stainless steel clamp. Specifically, the high-pressure rubber hose has good flexibility and pressure resistance, and can adjust the grouting angle and position to adapt to grouting holes at different locations, meeting the needs of most bridge and tunnel construction scenarios; the stainless steel clamp connection ensures a sealed connection and prevents grout leakage.

[0075] Both the positioning sleeve 123 and the sealing sleeve 124 are made of stainless steel. The positioning sleeve 123 is fitted onto the discharge end of the grouting hose 121, and the sealing sleeve 124 is fitted onto the outside of the positioning sleeve 123, with a sealing groove on the outer wall.

[0076] Specifically, the positioning sleeve 123 is made of rigid material and is used to insert into the grouting hole for positioning, preventing the grouting hose 121 from shaking during the grouting process and ensuring that the grout can be injected into the grouting hole; the sealing groove on the outer wall of the sealing sleeve 124 is filled with an oil-resistant rubber sealing gasket to enhance the sealing with the grouting hole, prevent grout leakage, and ensure stable grouting pressure.

[0077] The pressure sensor 122 can be a CYB-100 digital pressure gauge, which is connected to a stainless steel mounting base via a threaded seal. The mounting base is bolted to the top of the grouting head 12, and an oil-resistant rubber sealing gasket is fitted between the mounting base and the grouting head 12. The detection end of the pressure sensor 122 extends into the grouting head 12 to detect the grouting pressure and trigger backflow judgment.

[0078] Specifically, the pressure sensor 122 is used to detect the grouting pressure and feed the detected pressure signal back to the control cabinet, providing a trigger signal for grouting end judgment and backflow judgment; the stainless steel mounting base and oil-resistant rubber sealing gasket ensure that the pressure sensor 122 is installed in a sealed manner, without grout leakage, and avoids grout corrosion of the sensor from affecting the detection accuracy.

[0079] like Figures 2 to 13 As shown, the negative pressure structure is the core structure for achieving negative pressure backflow prevention and stratified grouting. It includes a negative pressure pump 13, a pressure stabilizing tank 131, a flow regulating valve 132, a negative pressure sensor 133, an air source distributor 31, a negative pressure branch pipe 32, and an electric valve 321. All components are connected by pipes and work together to provide stable and differentiated negative pressure to the flow suppression chamber 23 and the negative pressure hole, ensuring the smooth progress of the grouting process.

[0080] The negative pressure pump 13 is a water ring type negative pressure pump, which is bolted to the movable mounting bracket 14 and located inside the mounting housing 15. Its air inlet is connected to the first air guide pipe, and the air outlet is connected in series with the silencer 134 and the filter 135 to provide stable negative pressure for the entire negative pressure structure. In addition, the negative pressure pump 13 is connected to the flow suppression chamber 23 through a pipeline.

[0081] Specifically, the water ring structure has advantages such as stable operation, low noise, and convenient negative pressure adjustment, and can provide stable negative pressure for the flow suppression chamber 23 and the negative pressure branch pipe 32. The installation position is close to the rear end of the mounting shell 15, which facilitates connection with various pipelines and components, reduces pipeline length, and reduces negative pressure loss.

[0082] The air inlet of the negative pressure pump 13 is connected to the first air guide pipe by a flange and bolted together. The connection is sealed with a rubber ring. The air outlet is connected to a silencer 134 by a flange. A filter 135 is bolted to the top of the silencer 134.

[0083] Specifically, the bolt connection and rubber ring seal ensure that there is no air leakage at the air inlet of the negative pressure pump 13, thus avoiding negative pressure loss. The silencer 134 is used to reduce the exhaust noise generated during the operation of the negative pressure pump 13, thus avoiding noise pollution of the construction environment. The filter 135 is used to filter impurities and water vapor in the gas discharged from the negative pressure pump 13, thus avoiding impurities from polluting the environment and preventing water vapor from corroding subsequent components.

[0084] Both the silencer 134 and the filter 135 are located in a semi-open opening at the top of the mounting housing 15, and a pressure relief valve is provided at the top of the filter 135.

[0085] Specifically, the semi-open opening at the top of the mounting housing 15 facilitates gas discharge and component maintenance, the stainless steel flange connection ensures reliable sealing, and the pressure relief valve is located at the top of the filter 135 to facilitate the discharge of impurities and moisture accumulated inside the filter 135, ensuring the filtration effect and service life of the filter 135.

[0086] The pressure stabilizing tank 131 can be made of stainless steel and can be detachably installed on the top of the mounting shell 15 via the first bracket. The top is provided with multiple sets of interfaces, which are connected to various air pipes to buffer the pressure fluctuations generated during the operation of the negative pressure pump 13 and provide a stable negative pressure for the negative pressure structure.

[0087] Specifically, stainless steel has good corrosion resistance and strength, and the seamless welding process ensures reliable sealing of the tank, which can buffer negative pressure fluctuations and avoid sudden rises and falls in negative pressure from affecting the grouting effect; the first bracket is fixedly connected to the top of the mounting shell 15 by bolts to ensure that the pressure stabilizing tank 131 is installed without shaking.

[0088] The outlet of the pressure stabilizing tank 131 is sealed and connected to the inlet of the negative pressure pump 13 through the first air guide pipe, which is used to buffer the pressure fluctuation of the negative pressure pump 13. One set of air inlets is connected to the air source distributor 31 through the second air guide pipe, and another set of air inlets is connected to the outlet of the negative pressure sleeve 22 through the third air guide pipe, forming a second negative pressure pipeline, which is used to provide negative pressure to the flow suppression chamber 23 and buffer pressure fluctuation. A drain port and a drain valve are provided at the bottom.

[0089] Specifically, all types of air ducts are connected by flanges to ensure reliable sealing, and the drain valve can be opened periodically to discharge impurities and moisture accumulated in the pressure stabilizing tank 131, so as to avoid impurities affecting the pressure stabilizing effect.

[0090] A flow regulating valve 132 is connected in series in the first air guide tube to regulate the negative pressure state in the first air guide tube. A negative pressure sensor 133 is installed at the end of the first air guide tube near the pressure stabilizing tank 131 to monitor the negative pressure state in the first air guide tube. The two work together to achieve the regulation and monitoring of negative pressure.

[0091] Specifically, the flow regulating valve 132 can be a D971X-16P electric stainless steel wafer butterfly valve. The flow regulating valve 132 is electrically connected to the control cabinet, allowing users to adjust the overall negative pressure of the pipeline through the control cabinet. The negative pressure sensor 133 can be a Longlv PTL614 vacuum negative pressure transmitter. The detection end of the negative pressure sensor 133 extends into the first air guide pipe and is connected to the pipeline in a sealed manner through threads. The threads are wrapped with Teflon tape to ensure no air leakage. The negative pressure sensor 133 is connected to the control cabinet through a signal cable, which can monitor the negative pressure status in the first air guide pipe and feed back the detected negative pressure signal to the control cabinet, allowing users to monitor and adjust the negative pressure to ensure that the negative pressure is stable within the preset range.

[0092] The air source distributor 31 is made of stainless steel and is installed on the top of the mounting shell 15. Its air outlet is connected to the second air guide pipe, and multiple air inlets are connected to the corresponding negative pressure branch pipes 32 to realize the negative pressure distribution of multiple negative pressure branch pipes 32. At the same time, it forms multiple sets of first negative pressure pipelines to create negative pressure at the cracks and assist the slurry in filling the cracks. The negative pressure branch pipes 32 are used to connect the air source distributor 31 to the negative pressure hole to realize the delivery of negative pressure.

[0093] Specifically, the air source distributor 31 has one set of air outlets and multiple sets of air inlets. It is detachably installed on the top of the mounting shell 15 by bolts and is located next to the pressure stabilizing tank 131, which facilitates pipeline connection and subsequent maintenance. One set of air outlets ensures stable negative pressure input, and multiple sets of air inlets can realize the synchronous or independent control of multiple sets of negative pressure branch pipes 32, which can adapt to the layered grouting requirements of multi-depth cracks.

[0094] The multiple air inlets of the air source distributor 31 are respectively connected to multiple negative pressure branch pipes 32 through multiple electric valves 321.

[0095] Specifically, the electric valve 321 can be a VENN-BM-13S type ball electric valve. The electric valve 321 is used to control the air flow of the corresponding negative pressure branch pipe 32, so that the user can realize the differentiated negative pressure of multiple sets of negative pressure branch pipes 32 according to the construction requirements, thereby matching the grouting requirements of different depth cracks and realizing the layered grouting and diffusion of multi-depth cracks.

[0096] The negative pressure branch pipe 32 uses a high-pressure rubber hose, and each set of negative pressure branch pipes 32 has a filter pipe 322 and an air nozzle 323 sealed and installed in sequence at the air inlet end.

[0097] Specifically, the high-pressure rubber hose has good flexibility and pressure resistance, and can be adapted to negative pressure holes in different locations to meet the needs of different construction scenarios; the filter tube 322 is a stainless steel filter tube, used to filter impurities, dust and other substances in the airflow entering the negative pressure branch pipe 32, to prevent impurities from entering subsequent components, to prevent pipe blockage and component wear, and the filter tube 322 is a detachable structure, which is convenient for regular cleaning or replacement of the filter screen; the air nozzle 323 adopts a conical structure, is made of stainless steel, and is connected to the filter tube 322 by threads at the tail end, and is used to insert into the negative pressure hole. The outer side is fitted with an oil-resistant rubber sealing sleeve to enhance the sealing between it and the negative pressure hole, prevent air leakage, and ensure that a stable negative pressure can be formed in the negative pressure hole.

[0098] like Figures 2 to 14 As shown, the anti-backflow assembly is the core component for preventing slurry backflow. It is installed inside the mounting housing 15 and includes a connecting pipe 21, a negative pressure sleeve 22, a flow suppression chamber 23, a connecting flange 24, a sealing element 25, and a filter sleeve 26. It is connected in series in the first slurry pipe and works in conjunction with the solenoid valve 111 to achieve a double anti-backflow structure and prevent slurry backflow.

[0099] Specifically, the anti-backflow component is located inside the mounting shell 15 and is fixedly installed at the bottom of the mounting shell 15 by the second bracket. The second bracket is fixedly connected to the bottom of the mounting shell 15 by bolts to ensure stable installation. All components work together and do not affect the normal delivery of grout during grouting. After grouting is completed, the grout backflow speed is slowed down by the local low-pressure zone, providing response time for the solenoid valve 111 to close, thereby blocking the grout backflow.

[0100] The connecting pipe 21 is made of seamless stainless steel pipe and is installed inside the negative pressure sleeve 22. The two together form a closed flow suppression cavity 23. The connecting pipe 21 is used to transport slurry, and the negative pressure sleeve 22 is used to transmit negative pressure, providing conditions for the formation of local low pressure zones.

[0101] Specifically, the stainless steel seamless pipe ensures that the connecting pipe 21 has sufficient strength and corrosion resistance to withstand the impact of high-pressure slurry; multiple sets of air holes are evenly opened along the axial direction on the pipe wall, and the air holes penetrate the pipe wall of the connecting pipe 21 to connect the flow suppression chamber 23 and the inner cavity of the connecting pipe 21, ensuring that negative pressure can act on the inner cavity of the connecting pipe 21. At the same time, since the pore diameter is smaller than the particle size of the slurry solid particles, it can prevent the slurry from entering the flow suppression chamber 23 and not affect the normal transportation of the slurry; multiple sets of evenly distributed air holes ensure that the airflow can pass through evenly, forming a stable local low-pressure zone on the inner wall of the connecting pipe 21.

[0102] The negative pressure sleeve 22 is made of stainless steel seamless steel pipe and is sleeved on the outside of the connecting pipe 21. It has an interface in the middle and is connected to the third air guide pipe through a flange valve.

[0103] Specifically, the stainless steel seamless steel pipe material ensures the sealing and strength of the negative pressure sleeve 22. The flow suppression cavity 23 formed between the sleeve and the connecting pipe 21 is used to accommodate airflow, realize the transmission of negative pressure and the formation of a local low-pressure zone. The middle interface is used to receive the negative pressure delivered by the pressure stabilizing tank 131, ensuring that a stable negative pressure can be formed in the flow suppression cavity 23, providing power for the formation of a local low-pressure zone. The flange valve is used for switching operating conditions and on / off control. When the device is grouting, the flange valve is closed to cut off the negative pressure passage and does not affect normal grouting. When the device enters the negative pressure anti-backflow state, the flange valve is opened to ensure the stable establishment of negative pressure.

[0104] Two sets of connecting flanges 24 are respectively sealed and installed at both ends of the connecting pipe 21, and two sets of sealing elements 25 are respectively bolted to the connecting pipe 21 and embedded in the openings at both ends of the negative pressure sleeve 22, so as to realize the series installation of the connecting pipe 21 and the sealing of the flow suppression cavity 23.

[0105] Specifically, the connecting flange 24 is made of stainless steel and is connected to the connecting pipe 21 by bolts for a sealed connection. The connection is sealed with a rubber ring to ensure no leakage. The connecting flange 24 is used to connect the connecting pipe 21 in series with the first slurry pipe. An oil-resistant rubber gasket is placed between the connecting flanges 24, and the connection is fixed by bolts to ensure a sealed connection and prevent slurry leakage, thus achieving smooth slurry delivery.

[0106] The sealing element 25 is made of nitrile rubber and has a ring structure. One side is attached to the outer wall of the connecting pipe 21, and the other side is attached to the inner wall of the negative pressure sleeve 22. It is fixed to the connecting pipe 21 by a stainless steel clamp.

[0107] Specifically, nitrile rubber has good oil resistance, sealing performance and wear resistance, and is suitable for use in slurry and negative pressure environments; the ring structure and the fitting structure ensure that the seal 25 can seal both ends of the flow suppression cavity 23 to prevent negative pressure leakage, and the stainless steel clamp connection ensures that the seal 25 is reliably installed and avoids the seal 25 from falling off and affecting the sealing performance of the flow suppression cavity 23.

[0108] The filter sleeve 26 is made of stainless steel filter mesh and is fitted onto the connecting pipe 21. It is located inside the flow suppression cavity 23 and its two ends are respectively embedded in two sets of seals 25. It is used to filter impurities in the airflow and protect downstream components.

[0109] Specifically, the stainless steel filter screen has good corrosion resistance and filtration effect, which can filter out small impurities in the airflow discharged from the negative pressure sleeve 22, prevent impurities from entering subsequent components, and prevent pipeline blockage and component wear; the detachable design makes it easy to clean or replace the filter screen regularly, ensuring filtration effect and extending the service life of the device.

[0110] Solenoid valve 111 is located on the side of the anti-backflow assembly near the grouting pump 11 and is installed inside the mounting housing 15 via a third bracket. The inlet end of solenoid valve 111 is connected to the outlet end of the grouting pump 11, and the outlet end is connected to the inlet end of the connecting pipe 21 of the anti-backflow assembly via a U-shaped pipe 112, which is used to completely block the backflow of grout.

[0111] Specifically, the solenoid valve 111 can be of model RSPS-32JF, which is connected to the control cabinet via a control cable. The control cabinet controls its opening and closing. The opening and closing response time is fast, which can quickly block the backflow of slurry. It works in conjunction with the anti-backflow mechanism in the local low-pressure area to ensure backflow prevention. The solenoid valve 111 is equipped with a manual adjustment knob. When the control cabinet malfunctions, the opening and closing of the solenoid valve 111 can be controlled by manually adjusting the knob to ensure that the construction can proceed normally.

[0112] U-shaped tube 112 is made of stainless steel seamless steel pipe. Both ends are connected to the outlet end of solenoid valve 111 and the inlet end of connecting pipe 21 through flanges. Oil-resistant rubber gaskets are installed between the flanges and the connection is fixed by high-strength bolts.

[0113] Specifically, the U-shaped pipe 112 is used to reduce slurry fluctuations during slurry transportation and minimize the impact of slurry fluctuations on the grouting effect; the stainless steel material ensures the strength and corrosion resistance of the U-shaped pipe 112, and the flange connection ensures reliable sealing and no slurry leakage.

[0114] In practical applications, the discharge end of the grouting pump 11 is connected in series with the solenoid valve 111, the U-shaped pipe 112, the anti-backflow component and the feed end of the grouting head 12 through the first grout pipe to form a grouting pipeline for grouting and to prevent grout backflow.

[0115] The control cabinet is the core of the device. It is installed on the mobile mounting frame 14 and located on one side of the mounting shell 15. It is connected to each component via cables and is used to realize centralized control and parameter adjustment of each component, thereby improving the practicality and ease of operation of the device.

[0116] Specifically, the control cabinet has a rectangular structure. The control cabinet is electrically connected to the grouting pump 11, negative pressure pump 13, solenoid valve 111, pressure sensor 122, flow regulating valve 132, negative pressure sensor 133, electric valve 321, flange valve and mixer through cables to realize the coordinated control of each component, realize negative pressure backflow prevention and differentiated negative pressure assisted grouting, and ensure the reliability of grouting operation.

[0117] In this embodiment, the bridge tunnel grouting reinforcement device with a negative pressure anti-backflow structure is used for the reinforcement of rock mass fissures in bridge tunnels. The specific construction scenario involves the reinforcement of surrounding rock fissures in a highway tunnel. The tunnel's surrounding rock has well-developed fissures and exhibits localized water seepage, requiring grouting reinforcement to improve the overall integrity and seepage prevention performance of the rock mass. Based on the core functions of this invention, the specific construction steps are as follows, detailing the device's working process and parameter control to ensure standardized construction and achieve reinforcement and anti-backflow protection for fissures at multiple depths.

[0118] like Figures 3 to 14 As shown, the specific workflow of the bridge and tunnel grouting reinforcement device with negative pressure anti-backflow structure provided in this application is as follows:

[0119] Pre-construction preparation stage:

[0120] First, the construction area is cleaned. Then, a layer of concrete is poured evenly on the surface of the rock mass to be reinforced, forming a relatively closed reinforcement area. The thickness of the concrete can be adjusted according to the flatness of the rock surface and the development of cracks. After pouring, the distribution of rock cracks is detected by external detection equipment. Then, according to the distribution of rock cracks, grouting holes and multiple sets of negative pressure holes are drilled using external drilling equipment. The grouting holes correspond to the main cracks, and the multiple sets of negative pressure holes correspond to multiple sets of secondary cracks at different depths. The grouting holes are used to inject grout into the cracks. The number of negative pressure holes is determined according to the area of ​​the closed area and the distribution of cracks to ensure that the negative pressure can act on the entire crack area and guide the grout to diffuse into the cracks. Next, the control cabinet is started to control the mixer, and raw materials are added to the mixer to make grout.

[0121] Pipeline connection and establishment of negative pressure differential:

[0122] The device is moved to the construction area and fixed using a traction hook. Then, the positioning sleeve 123 at the outlet end of the grouting hose 121 is inserted into the grouting hole, ensuring sufficient insertion depth. A sealing sleeve 124 is used to ensure no grout leakage between the grouting hole and the grouting hose 121. Next, the air nozzles 323 at the ends of each negative pressure branch pipe 32 are inserted into their corresponding negative pressure holes, ensuring sufficient insertion depth. A sealing sleeve is used to ensure no air leakage between the negative pressure hole and the negative pressure branch pipe 32. Simultaneously, clamps are used to fix the negative pressure branch pipe 32 to prevent it from falling off during grouting. All pipe connections are checked to ensure no grout or air leakage. After pipe connections are completed, the negative pressure pump 13 is started and continuously runs via the control cabinet. Negative pressure is delivered to multiple negative pressure branch pipes 32 via the air source distributor 31. According to the filling requirements of different depth cracks, the opening of each group of electric valves 321 is independently adjusted via the control cabinet to create differentiated negative pressure at negative pressure holes of different depths.

[0123] Differentiated negative pressure values ​​are set according to the depth of the cracks, with higher negative pressure corresponding to deeper cracks and lower negative pressure corresponding to shallower cracks. This ensures that the negative pressure can match the filling requirements of cracks at different depths, guiding the grout to penetrate into deeper cracks. After the negative pressure difference is established, the negative pressure pump 13 is kept running to ensure the stability of the negative pressure difference and provide power for grout injection and diffusion.

[0124] Layered grouting and backflow prevention control:

[0125] After the negative pressure difference stabilizes, the grouting pump 11 is started, and the well-mixed grout is transported through pipelines, passing sequentially through the solenoid valve 111, U-shaped pipe 112, connecting pipe 21 of the anti-backflow component, and grouting head 12. Finally, the grout is injected into the grouting hole through the grouting hose 121 connected to the grouting head 12. During the grouting process, the opening of the electric valve 321 is adjusted by the control cabinet to maintain the differentiated negative pressure of each negative pressure hole. For shallow fractures, the grouting pressure and flow rate can be appropriately reduced to avoid grout waste; for deep fractures, the grouting pressure and flow rate can be appropriately increased, while increasing the negative pressure of the corresponding negative pressure hole to guide the grout to penetrate deeper.

[0126] During grouting operation, the grouting pump 11 continuously drives the grout to flow through the inner cavity of the connecting pipe 21. Because the pore size of the connecting pipe 21 is smaller than the particle size of the solid particles in the grout, and the flange valve is closed, the grout cannot enter the flow suppression chamber 23; only gas can be discharged through the pores, which does not affect the normal transport of the grout. When the pressure sensor 122 detects that the grouting pressure has reached a preset threshold and has remained stable for a period of time, it is determined that the crack is fully filled. At this point, the grouting pump 11 is stopped, and the grouting operation ends. The criteria for determining the end of grouting can be adjusted according to construction needs; for areas with higher seepage prevention requirements, the criteria can be appropriately increased.

[0127] After the grouting pump 11 is shut down, when the pressure sensor 122 detects a sudden drop in pressure and reverse fluctuation in the grouting head 12, the device switches to a negative pressure anti-backflow state. The control cabinet controls the negative pressure pump 13 to continue running, the flange valve opens, and the negative pressure pump 13 draws in the flow suppression chamber 23. When the grout flows back to the connecting pipe 21, a local low-pressure zone is formed on the inner wall surface of the connecting pipe 21, providing sufficient response time for the solenoid valve 111 to close. Subsequently, the control cabinet controls the solenoid valve 111 to close quickly, thus blocking the grout backflow. The boundary layer of the local low-pressure zone slows down the grout backflow rate, preventing a large amount of grout from flowing back before the solenoid valve 111 closes, and preventing grout backflow from damaging the device components.

[0128] Construction completion stage:

[0129] After grouting is completed, the negative pressure pump 13 is kept running for a period of time. The negative pressure is used to further promote the flow and penetration of the grout in the rock fissures, ensuring that the fissures are filled tightly. At the same time, the air and excess water in the fissures are discharged, which improves the bonding strength and curing speed of the grout. After the grout has completely cured, the grouting hose 121 and the negative pressure branch pipe 32 are removed. Then, the concrete sealing layer is removed according to the construction requirements. After the device is released from its fixation, it is retrieved by a traction hook.

[0130] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A bridge tunnel grouting reinforcement device with a negative pressure anti-backflow structure, characterized in that, include: Grouting pump (11), grouting head (12), negative pressure pump (13), and anti-backflow assembly; The grouting pump (11) is connected to the grouting head (12) through the first grout pipe. The anti-backflow assembly is connected in series in the first slurry pipe. It includes a connecting pipe (21) and a negative pressure sleeve (22) sleeved on the outside of the connecting pipe (21). The outer wall of the connecting pipe (21) and the inner wall of the negative pressure sleeve (22) form a flow suppression cavity (23). Multiple sets of air holes are uniformly opened along the axial direction on the pipe wall of the connecting pipe (21). The air holes penetrate the pipe wall to connect the flow suppression cavity (23) with the inner cavity of the connecting pipe (21). The negative pressure pump (13) is connected to the flow suppression chamber (23) through a pipeline; A solenoid valve (111) is provided between the grouting pump (11) and the anti-backflow assembly. The solenoid valve (111) is connected in series in the first grout pipe to block the backflow of grout.

2. The bridge tunnel grouting reinforcement device with negative pressure anti-backflow structure according to claim 1, characterized in that: The device has a grouting working state and a negative pressure anti-backflow state; During the grouting operation, the grouting pump (11) operates, driving the grout to flow through the inner cavity of the connecting pipe (21); Under the negative pressure anti-backflow state, the negative pressure pump (13) operates and draws the flow suppression chamber (23). The airflow flows through the air hole from the inner cavity of the connecting pipe (21) to the flow suppression chamber (23), forming a local low-pressure area on the inner wall surface of the connecting pipe (21), blocking the transmission of backflow slurry pressure, providing response time for the closing of the solenoid valve (111), and realizing the blocking of slurry backflow; The pores are smaller than the minimum particle size of solid particles in the slurry. The pores only allow gas to pass through while blocking the slurry from entering the flow suppression cavity (23) to maintain the continuity of the local low-pressure zone.

3. The bridge tunnel grouting reinforcement device with negative pressure anti-backflow structure according to claim 1, characterized in that, The device further includes: A pressure stabilizing tank (131) is provided. The outlet of the pressure stabilizing tank (131) is connected to the inlet of the negative pressure pump (13) through a first air guide pipe. The pressure stabilizing tank (131) is used to buffer the pressure fluctuations of the negative pressure pump (13). A flow regulating valve (132) is connected in series in the first air guide pipe and is used to regulate the negative pressure state in the first air guide pipe. A negative pressure sensor (133) is installed at one end of the first air duct near the pressure stabilizing tank (131), and the detection end extends into the first air duct to monitor the negative pressure state in the first air duct.

4. A bridge tunnel grouting reinforcement device with a negative pressure anti-backflow structure according to claim 3, characterized in that, The pressure stabilizing tank (131) is connected to: The gas source distributor (31) has an outlet end connected to one of the inlet ends of the pressure stabilizing tank (131) via a second air guide pipe. The multiple inlet ends of the gas source distributor (31) are all connected to negative pressure branch pipes (32) to form multiple sets of first negative pressure pipelines, which are used to create negative pressure at the cracks and assist the slurry in filling the cracks. The other air inlet of the pressure stabilizing tank (131) is connected to the air outlet of the negative pressure sleeve (22) through the third air guide pipe to form a second negative pressure pipeline, which is used to provide negative pressure to the flow suppression cavity (23) and buffer pressure fluctuations.

5. A bridge tunnel grouting reinforcement device with a negative pressure anti-backflow structure according to claim 4, characterized in that: The outlet of each negative pressure branch pipe (32) is connected to the inlet of the air source distributor (31) through an electric valve (321). The electric valve (321) is used to independently control the air flow of the corresponding negative pressure branch pipe (32) so that each negative pressure branch pipe (32) forms a differentiated negative pressure. The differentiated negative pressure is used to match the grouting requirements of fractures of different depths, so as to realize the layered grouting and diffusion of fractures of multiple depths.

6. A bridge tunnel grouting reinforcement device with a negative pressure anti-backflow structure according to claim 1, characterized in that, The anti-backflow component also includes: Two sets of connecting flanges (24) are connected in series at both ends of the connecting pipe (21) to the first slurry pipe through the two sets of connecting flanges (24); Two sets of sealing elements (25) are respectively sleeved on the connecting pipe (21) and respectively embedded in the openings at both ends of the negative pressure sleeve (22) to seal the two ends of the flow suppression cavity (23).

7. A bridge tunnel grouting reinforcement device with a negative pressure anti-backflow structure according to claim 6, characterized in that: The flow suppression cavity (23) is provided with a filter sleeve (26), and the two ends of the filter sleeve (26) are respectively embedded in the two sets of the sealing elements (25) for filtering the airflow discharged from the negative pressure sleeve (22).

8. A bridge tunnel grouting reinforcement device with a negative pressure anti-backflow structure according to claim 1, characterized in that: The solenoid valve (111) is located on the side of the anti-backflow assembly near the grouting pump (11), and the outlet end of the solenoid valve (111) is connected to the inlet end of the connecting pipe (21) of the anti-backflow assembly through a U-shaped pipe (112); The negative pressure pump (13) has a silencer (134) and a filter (135) connected in series at its outlet end to process the gas discharged by the negative pressure pump (13).

9. A bridge tunnel grouting reinforcement device with a negative pressure anti-backflow structure according to claim 8, characterized in that: The discharge end of the grouting head (12) is connected to a grouting hose (121) to assist the grouting head (12) in injecting grout. A pressure sensor (122) is installed on the top of the grouting head (12). The detection end of the pressure sensor (122) extends into the grouting head (12) to detect the grouting pressure and trigger backflow judgment. The discharge end of the grouting pump (11) is connected in series with the solenoid valve (111), the U-shaped pipe (112), the anti-backflow component and the feed end of the grouting head (12) through the first grout pipe to form a grouting pipeline for grouting and to prevent grout backflow.

10. A bridge tunnel grouting reinforcement device with a negative pressure anti-backflow structure according to claim 1, characterized in that, The device further includes: The grouting pump (11) is detachably mounted on the mobile mounting frame (14). Mounting housing (15), which is mounted on the movable mounting frame (14), has a semi-open top structure. The negative pressure pump (13) is mounted on the movable mounting frame (14) and located inside the mounting housing (15). The anti-backflow component is located inside the mounting housing (15). The grouting head (12) is detachably mounted on the mounting housing (15).

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