Bridge prestressed pipe grouting device

Abstract

This application discloses a grouting device for prestressed ducts in bridges, relating to the field of grouting equipment technology. It includes fasteners embedded in the prestressed duct, a detection and pressure-repairing grouting pipe, and a grouting device. The grouting device includes an outer shell, a material conveying assembly, and an isolation pipe assembly. The outer shell is tubular in shape, including a tubular section, a conical section, a combined section, and a top cover detachably fixed to the top of the tubular section, which has a display instrument and an input hole. The material conveying assembly includes a pumping assembly and a first annular plate. The first annular plate is a rubber annular plate, with its upper and lower edges fixed to the inner wall of the tubular section. The first annular plate is located at the lower part of the tubular section. The isolation pipe assembly includes an isolation pipe and a positioning clamp. The isolation pipe is a rubber elastic pipe. The end of the isolation pipe is clamped and fixed to the positioning clamp. This device achieves the technical advantages of convenient use, no need for disassembly and cleaning, and efficient grouting process.

Description

Technical Field

[0001] This invention relates to the field of grouting equipment technology, and in particular to a grouting device for prestressed ducts in bridges. Background Technology

[0002] With the rapid development of infrastructure construction in my country, prestressed concrete structures have been widely used in large-scale projects due to their significant technical and economic advantages. Especially in bridge construction, traditional bridge grouting methods, which use a high water-cement ratio, often result in bleeding and incomplete compaction of the prestressed ducts, leading to pore formation and corrosion of the prestressed steel strands. This reduces the safety factor of post-tensioned prestressed structures, and there have been numerous bridge collapses both domestically and internationally caused by the loss of load-bearing cross-sectional area due to corrosion of prestressed steel bars. Currently, bridge grouting also suffers from insufficient compaction, affecting the safe operation of bridges. Particularly after grout has solidified for 3-4 days, the grout flows to both sides of the precast beam under gravity, causing voids at the highest point of the beam. Currently, during the grouting process of precast beams, voids are typically filled with grout 3-4 days after solidification.

[0003] Chinese invention patent CN111733707B discloses a grouting device and construction method for prestressed ducts in bridges. The grouting device includes a beam body and a grouting assembly that works in conjunction with the beam body. Several prestressed ducts are installed within the beam body 001. The grouting assembly includes fasteners 003 embedded in the prestressed ducts 002, a detection and grouting pipe 004 connecting the fasteners to the outside of the beam body, a grout storage tank, a grouting machine, and anchor plates at the beam ends. The grouting test and pressure replenishment pipe is connected to the grout storage tank, and a first valve is installed on the grouting test and pressure replenishment pipe. The grouting machine is equipped with a negative pressure switch, a high pressure switch, a pressure gauge, and a vacuum gauge. The grout storage tank is connected to the negative pressure switch via a vacuum tube, and a second valve is installed on the vacuum tube. A grouting pressure replenishment funnel is also installed on the grout storage tank. A third valve is installed on the pipeline between the grouting pressure replenishment funnel and the grout storage tank. The grout storage tank is connected to the high pressure switch via a high pressure tube, and a fourth valve is installed on the high pressure tube. This application uses a fastener 003, which is similar in shape to the prestressed duct, embedded in the prestressed duct, and a pipeline connecting the fastener 003 to the outside of the beam 001 as a test pipe and grouting pressure replenishment pipe. The sealing membrane on the fastener 003 prevents the grout from blocking the embedded grouting pressure replenishment pipe during grouting. The combination of a vacuum pump and a high-pressure air pump built into the grouting machine enables convenient and flexible combination application of the equipment required for grouting pressure replenishment.

[0004] However, in actual implementation of the above scheme, each component of the device needs to be assembled on-site, which is time-consuming and labor-intensive, and the overall sealing performance is difficult to guarantee after repeated use. After grouting is completed, each valve, grout storage tank and other connecting pipes need to be disassembled and cleaned. During the disassembly and cleaning process, it is easy to damage each component, especially the valve body. The entire disassembly and assembly process is cumbersome and not conducive to the efficient grouting operation. Summary of the Invention

[0005] This application provides a bridge prestressed duct grouting device, which solves the technical problems of inconvenient assembly, need for disassembly and cleaning after use, cumbersome disassembly and assembly process and easy damage to various parts of the device in the prior art. It achieves the technical effect of convenient use, no need for disassembly and cleaning and can ensure the efficient implementation of the grouting process.

[0006] This application provides a grouting device for prestressed ducts of bridges, including fasteners embedded in the prestressed ducts, a detection and pressure-replenishing grouting pipe connecting the fasteners to the outside of the beam, and a grouting device.

[0007] The grouting device includes an outer shell, a material conveying assembly, and an isolation pipe assembly;

[0008] The outer casing is tubular in shape, including a tubular part, a tapered part located below the tubular part, a combined part located below the tapered part, and a top cover that is detachably and fixedly connected to the top of the tubular part and is provided with a display instrument and an input hole;

[0009] The material conveying assembly includes a pumping assembly and a first annular plate; the first annular plate is a rubber annular plate with its upper and lower edges fixed to the inner wall of the tubular part, forming an annular space together with the inner wall of the outer shell, and the pumping assembly is connected to this space; the first annular plate is located at the lower part of the tubular part.

[0010] The isolation tube assembly includes an isolation tube and a positioning clamp;

[0011] The isolation tube is an elastic tube made of rubber, and most of it is located inside the outer shell; the end of the isolation tube is clamped and fixed on the positioning clamp.

[0012] The positioning clamp is a combination of several clamps evenly distributed on the outer wall of the tubular part, located near the top of the tubular part.

[0013] Furthermore, the conveying assembly includes a pump body, a valve body, and a conveying pipe;

[0014] The valve body is positioned on the pump body and is a switching valve controlled by the control unit.

[0015] The delivery pipe is positioned on the valve body and serves to deliver the fluid medium.

[0016] The pump body is connected to the input port through a delivery pipe.

[0017] Furthermore, the tubular portion is a rigid straight tube;

[0018] The conical part is a trumpet shape that is larger at the top and smaller at the bottom, and its appearance is an inverted cone. It is connected to the internal space of the tubular part.

[0019] The assembly section is a straight pipe used to assemble the outer shell with the detection and pressure replenishment grouting pipe.

[0020] Preferably, there are multiple pump bodies, at least one of which is an air pump, and the fluid medium pumped into the annular space formed by the pump body and the inner wall of the outer casing is gas or liquid.

[0021] Preferably, a second annular piece is also positioned on the inner wall of the tubular portion. The structure of the second annular piece is the same as that of the first annular piece. Both the upper and lower edges are fixed on the inner wall of the tubular portion, forming an annular space together with the inner wall of the outer shell. The pumping assembly is connected to this space. The second annular piece is located in the middle of the tubular portion.

[0022] Preferably, after injecting slurry into the outer shell, a vibrating bag is placed on the slurry. The vibrating bag expands and contracts by alternating the air pressure above the slurry, thereby tapping the slurry and eliminating some air bubbles in the slurry; the vibrating bag is a disc-shaped elastic airbag.

[0023] Preferably, a third annular piece is also positioned on the inner wall of the tubular part. The structure of the third annular piece is the same as that of the first annular piece. The upper and lower edges are fixed on the inner wall of the tubular part, and together with the inner wall of the outer shell, they form an annular space. The pump body is connected to this space through a delivery pipe.

[0024] The third annular piece is located near the top of the tubular section;

[0025] The third annular piece includes a first elastic part and a second elastic part, both of which are annular and made of the same material.

[0026] The thickness of the first elastic part is less than half that of the second elastic part, and the width is less than one-third that of the second elastic part. The first elastic part is located on top of the second elastic part.

[0027] Preferably, the outer casing is further provided with an air extraction hole and an air extraction pipe, and the air extraction pipe is provided with a pressure gauge;

[0028] The air extraction hole is located on the tubular part and below the first annular plate, serving as a gas channel. Before the first annular plate expands, the air extraction hole is blocked by the isolation tube, and when the first annular plate expands, the air extraction hole is exposed.

[0029] The air extraction pipe is fixed to the outer wall of the tubular part and communicates with the air extraction hole;

[0030] The extraction pipe is connected to the valve body via a delivery pipe; the pressure gauge is used to detect the pressure value in the extraction pipe.

[0031] Preferably, it also includes a sealing component; the sealing component is positioned in the space formed by the first annular piece and the inner wall of the outer shell, and includes an adsorption body, a positioning body and a positioning rope, which correspond one-to-one;

[0032] The adsorbent is an ellipsoid with a permanent magnet at one end and an electromagnet fixed inside; the permanent magnet is normally adsorbed on the positioning body; the operation of the electromagnet is controlled by the control unit.

[0033] The positioning body is an iron block or iron sheet, fixed near the middle of the first annular plate, and is made of ferromagnetic material;

[0034] One end of the positioning rope is fixed to the other end of the adsorption body, and the other end is fixed to the inner wall of the outer shell.

[0035] The number of adsorbents, positioning bodies, and positioning ropes is four, all arranged symmetrically in pairs. After the first annular plate separates the space inside the outer shell, the control unit controls the electromagnet to be energized, causing the adsorbents to be adsorbed together in an alternating manner, thereby squeezing the straight gap formed by the expansion of the first annular plate into a curved shape.

[0036] Preferably, the positioning rope is an elastic rope.

[0037] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0038] By providing an integral tubular bridge prestressed duct grouting device, which utilizes the expansion and contraction of the bladder to achieve valve function and uses air pressure to assist in the grouting operation, this device effectively solves the technical problems of existing bridge prestressed duct grouting devices, such as inconvenient assembly, the need for disassembly and cleaning after use, and the cumbersome disassembly and assembly process that easily damages the device's components. This results in a bridge prestressed duct grouting device that is convenient to use, requires no disassembly and cleaning, and ensures efficient grouting process. Attached Figure Description

[0039] Figure 1 A schematic diagram showing the positional relationship between the prestressed duct grouting device and the beam of a bridge.

[0040] Figure 2 A simplified structural diagram of a grouting device for prestressed ducts in bridges;

[0041] Figure 3 This is a schematic diagram showing the positional relationship between the tubular section and the top cover;

[0042] Figure 4 This is a schematic diagram showing the positional relationship between the tubular section and the first annular plate.

[0043] Figure 5 A schematic diagram showing the storage and storage of grout in a prestressed duct grouting device for bridges.

[0044] Figure 6 This is a schematic diagram showing the positional relationship between the second annular plate and the first annular plate.

[0045] Figure 7 This is a simplified structural diagram of the third annular plate;

[0046] Figure 8 This is a schematic diagram of the deformation state of the third annular piece;

[0047] Figure 9 This is a schematic diagram showing the positional relationship between the air extraction port and the tubular part.

[0048] Figure 10 A simplified structural diagram of the closed component;

[0049] Figure 11 This is a schematic diagram showing the state of the adsorbents after they have adsorbed together.

[0050] In the picture:

[0051] Beam 001, prestressed duct 002, fastener 003, inspection and pressure replenishment grouting pipe 004;

[0052] The outer casing 100, tubular part 110, air extraction port 111, air extraction pipe 112, air pressure gauge 113, conical part 120, assembly part 130, top cover 140, input port 141, and display instrument 142;

[0053] Pumping assembly 210, pump body 211, valve body 212, delivery pipe 213, first annular plate 220, second annular plate 230, third annular plate 240, first elastic part 241, second elastic part 242;

[0054] Isolation tube 310, positioning clamp 320, oscillation bag 330;

[0055] Adsorption body 410, permanent magnet 411, electromagnet 412, positioning body 420, positioning rope 430. Detailed Implementation

[0056] To facilitate understanding of the present invention, a more complete description of this application will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of the present invention.

[0057] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0059] Example 1

[0060] like Figures 1 to 5 As shown, the bridge prestressed duct grouting device of this application includes a fastener 003 embedded in the prestressed duct 002, a detection and pressure replenishing grouting pipe 004 connecting the fastener 003 to the outside of the beam 001, and a grouting device for filling grout into the cavity.

[0061] The grouting device includes an outer shell 100, a material conveying assembly, an isolation pipe assembly, a power assembly, and a control unit;

[0062] The outer casing 100 is tubular in shape, serving both a load-bearing function and a slurry channel. The outer casing 100 includes a tubular portion 110, a conical portion 120, a combined portion 130, and a top cover 140. The tubular portion 110 is a rigid straight tube. The conical portion 120 is flared at the top and narrow at the bottom, resembling an inverted cone, and is positioned at the bottom of the tubular portion 110, communicating with its internal space. The combined portion 130 is a straight tube, positioned at the bottom of the conical portion 120, and is used to assemble (and cooperate) the outer casing 100 with the detection and pressure replenishment slurry pipe 004. The top cover 140 is detachably and fixedly connected to the top of the tubular portion 110. The top cover 140 has a display instrument 142 for feedback of the internal air pressure of the outer casing 100, and also has an input port 141 for gas entry and exit.

[0063] The material conveying assembly includes a pumping component 210 and a first annular plate 220. The pumping component 210 is used to pump fluid medium into the housing 100 and includes a pump body 211, a valve body 212, and a delivery pipe 213. The valve body 212 is positioned on the pump body 211 and is a switching valve controlled by a control unit. The delivery pipe 213 is positioned on the valve body 212 and serves to deliver the fluid medium. The pump body 211 is connected to the input port 141 through the delivery pipe 213. The first annular plate 220 is a rubber annular plate (tube) with the same axial direction as the housing 100. Its upper and lower edges are fixed to the inner wall of the tubular portion 110, forming an annular space together with the inner wall of the housing 100. The pump body 211 is connected to this space through the delivery pipe 213. The first annular plate 220 is located at the lower part of the tubular portion 110.

[0064] The isolation tube assembly is used to isolate the slurry from the first annular sheet 220, avoiding direct contact between the two and thus extending the service life of the first annular sheet 220. It includes an isolation tube 310 and a positioning clamp 320. The isolation tube 310 is an elastic tube made of rubber, which is tubular in shape and mostly located inside the outer shell 100. The positioning clamp 320 is a combination of several clamps evenly distributed on the outer wall of the tubular part 110, which is located near the top of the tubular part 110. In actual use, the end of the isolation tube 310 is clamped and fixed on the positioning clamp 320, and then the isolation tube 310 is inserted into the interior of the outer shell 100 from the top opening of the outer shell 100, so that the isolation tube 310 hangs down naturally, thereby resisting and covering the first annular sheet 220.

[0065] The power assembly is used to provide power for the operation of each component of the bridge prestressed duct grouting device of this application, and the control unit plays the role of controlling the coordinated operation of each component of the bridge prestressed duct grouting device. Both are existing technologies and will not be described in detail here.

[0066] Preferably, the control unit is a combination of a programmable logic controller and control buttons.

[0067] In actual grouting operations, the steps are as follows:

[0068] 1. Assemble the outer casing 100 onto the detection and pressure replenishment grout pipe 004, and then seal the upper cover 140;

[0069] 2. Control the operation of the pumping component 210 to pump the internal space of the outer shell 100 and the cavity space connected thereto to the required negative pressure (the specific pressure value can be referred to Chinese invention patent with patent number CN111733707B);

[0070] 3. Control the operation of the pumping assembly 210 to cause the first annular plate 220 to expand and thus divide the internal space of the outer shell 100 into two;

[0071] 4. Open the top cover 140 and pour a specific volume (determined according to actual needs) of slurry into the outer shell 100;

[0072] 5. Cover the top cover 140, and then control the first annular plate 220 to gradually shrink, so that the slurry gradually enters the cavity under the dual action of suction and its own gravity;

[0073] 6. Control the operation of the pumping component 210 to pump gas into the space above the slurry, thereby assisting the slurry to enter the cavity (equivalent to applying extrusion pressure above the slurry);

[0074] 7. Observe the barometer 113 in real time and use its displayed data as the basis for judging whether the cavity has been filled (if the increase in barometer 113 is proportional to the increase in gas in the outer casing 100, it can be basically determined that the cavity is filled).

[0075] 8. After the grouting is completed, pour out the remaining grout from the outer shell 100, weigh or measure the volume and calculate the size of the cavity. The removed grout can be reused.

[0076] 9. If the grouting is completed and no further grouting operation is to be performed in a short period of time, the outer casing 100 and the isolation pipe 310 shall be flushed.

[0077] Preferably, the pressure is stabilized for more than 15 minutes after pressurization.

[0078] Preferably, the isolation tube 310 is replaced after 5 to 30 uses, depending on the actual wear and tear.

[0079] Preferably, in actual use, the filling speed of the slurry can be controlled by controlling the expansion and contraction of the first annular plate 220.

[0080] Preferably, there are multiple pump bodies 211, at least one of which is an air pump, and the fluid medium pumped into the annular space formed by the pump body and the inner wall of the outer casing 100 is gas or liquid.

[0081] To reduce air bubbles in the grout and thus further ensure the grouting effect, such as Figure 6As shown, a second annular piece 230 is also positioned on the inner wall of the tubular portion 110. The structure of the second annular piece 230 is the same as that of the first annular piece 220. The upper and lower edges are fixed on the inner wall of the tubular portion 110, forming an annular space together with the inner wall of the outer shell 100. The pump body 211 is connected to this space through the delivery pipe 213. The second annular piece 230 is located in the middle of the tubular portion 110. In actual use, the second annular piece 230 can be controlled to agitate after step 4 and before step 5, thereby squeezing out some of the air bubbles mixed in the slurry (peristalsis squeezes out the air bubbles).

[0082] Preferably, in actual use, defoaming can be assisted by alternating the air pressure above the slurry (i.e., alternately extracting gas from the space above the slurry and pumping gas into the space above the slurry).

[0083] Preferred, such as Figure 5 As shown, after the slurry is injected into the outer shell 100, a vibrating bag 330 is placed on the slurry. The vibrating bag 330 expands and contracts by alternating the air pressure above the slurry, thereby patting the slurry and eliminating some air bubbles in the slurry; the vibrating bag 330 is a disc-shaped elastic air bag.

[0084] To prevent the slurry from splashing and adhering to the contact point between the top cover 140 and the isolation tube 310 when injected into the outer casing 100, thereby affecting the assembly and sealing of the top cover 140, preferably, as follows: Figure 7 and Figure 8 As shown, a third annular piece 240 is also positioned on the inner wall of the tubular portion 110. The structure of the third annular piece 240 is the same as that of the first annular piece 220. Both its upper and lower edges are fixed to the inner wall of the tubular portion 110, forming an annular space together with the inner wall of the outer casing 100. The pump body 211 is connected to this space through the delivery pipe 213. The third annular piece 240 is located near the top of the tubular portion 110. The third annular piece 240 includes a first elastic part 241 and a second elastic part 242, both of which are annular. And the materials are the same; the thickness of the first elastic part 241 is less than half of the second elastic part 242, and the width is less than one-third of the second elastic part 242. The first elastic part 241 is located on top of the second elastic part 242; the longitudinal section of the third annular piece 240 in the expanded state is approximately 3-shaped; in actual use, before the slurry is injected into the shell 100, the expansion of the third annular piece 240 is controlled so that the part of the isolation tube 310 that will directly contact the top cover 140 when assembling the top cover 140 is transferred to one side of the tubular part 110, thereby avoiding dirt.

[0085] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages:

[0086] This invention solves the technical problems of existing bridge prestressed duct grouting devices, such as inconvenient assembly, the need for disassembly and cleaning after use, and the cumbersome disassembly and assembly process that can easily damage the components of the device. It achieves the technical effect of making the bridge prestressed duct grouting device convenient to use, requiring no disassembly and cleaning, and ensuring the efficient implementation of the grouting process.

[0087] Example 2

[0088] Considering that the bridge prestressed duct grouting device in the above embodiment requires negative pressure to be drawn first, and then the grout is injected into the outer shell 100 after the negative pressure is drawn, and then the grouting operation is performed; in order to improve efficiency, such as Figure 9 As shown, this embodiment adds an air extraction port 111 and an air extraction pipe 112 to the outer casing 100 based on the above embodiment, and installs a pressure gauge 113 on the air extraction pipe 112; specifically:

[0089] The air extraction hole 111 is located on the tubular part 110 and below the first annular plate 220, and serves as a gas channel. Before the first annular plate 220 expands, the air extraction hole 111 is blocked by the isolation tube 310. When the first annular plate 220 expands, the air extraction hole 111 is exposed.

[0090] The suction pipe 112 is fixed on the outer wall of the tubular part 110 and communicates with the suction port 111; the suction pipe 112 is connected to the valve body 212 through the delivery pipe 213; the pressure gauge 113 is used to detect the pressure value in the suction pipe 112 (the space below the first annular plate 220 inside the outer shell 100).

[0091] When the bridge prestressed duct grouting device of this application is actually used for grouting, the steps are as follows:

[0092] 1. Assemble the outer shell 100 onto the detection and pressure replenishment slurry pipe 004; control the operation of the pumping assembly 210 to cause the first annular plate 220 to expand and thus divide the internal space of the outer shell 100 into two.

[0093] 2. Control the operation of the pumping assembly 210 to pump the space below the first annular plate 220 inside the outer casing 100 and the cavity space connected thereto to the required negative pressure; at the same time, inject a specific volume (determined according to actual needs) of slurry into the outer casing 100.

[0094] 3. Cover the top cover 140, and then control the first annular plate 220 to gradually shrink, so that the slurry gradually enters the cavity under the dual action of suction and its own gravity;

[0095] 4. Control the operation of the pumping component 210 to pump gas into the space above the slurry, thereby assisting the slurry to enter the cavity;

[0096] 5. Observe the barometer 113 in real time and use its displayed data as the basis for judging whether the cavity has been filled.

[0097] 6. After the grouting is completed, pour out the remaining grout from the outer shell 100, weigh or measure the volume and calculate the size of the cavity. The removed grout can be reused.

[0098] 7. If the grouting is completed and no further grouting operation is to be performed in a short period of time, the outer casing 100 and the isolation pipe 310 shall be flushed.

[0099] To enhance the partitioning effect of the first annular plate 220 on the internal space of the outer casing 100 when it expands, reduce the probability of air leakage at the first annular plate 220 during negative pressure extraction, and thus further improve the practicality of this application; preferably, as Figure 10 and Figure 11 As shown, the bridge prestressed duct grouting device of this application embodiment also includes a sealing component; the sealing component is positioned in the space formed by the first annular plate 220 and the inner wall of the outer shell 100, and includes an adsorption body 410, a positioning body 420 and a positioning rope 430, which correspond one-to-one.

[0100] The adsorption body 410 is an ellipsoid with a permanent magnet 411 at one end and an electromagnet 412 fixed inside; the permanent magnet 411 is normally adsorbed on the positioning body 420; the operation of the electromagnet 412 is controlled by the control unit.

[0101] The positioning body 420 is an iron block or iron sheet, fixed to the first annular piece 220 near the middle position; it is made of ferromagnetic material.

[0102] One end of the positioning rope 430 is fixed to the other end of the adsorption body 410, and the other end is fixed to the inner wall of the outer shell 100.

[0103] The number of adsorbent 410, positioning body 420 and positioning rope 430 is preferably four, all arranged symmetrically in pairs; after the first annular plate 220 divides the space inside the outer shell 100, the control unit controls the electromagnet 412 to be energized, so that the adsorbent 410 adsorb together in an alternating manner, thereby squeezing the straight gap formed after the first annular plate 220 expands into a curved shape, thereby reducing the probability of air leakage.

[0104] Preferably, to avoid tangling, the positioning rope 430 is an elastic rope.

[0105] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can have various modifications and variations. 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 prestressed duct grouting device, comprising a fastener embedded in a prestressed duct, a detection and grouting pipe connected to the fastener outside the beam body, characterized in that: Also include grouting device; The grouting device includes an outer shell, a material conveying assembly, and an isolation pipe assembly; The outer shell is tubular as a whole, including a tubular part, a conical part below the tubular part, a combined part below the conical part, and an upper cover detachably fixed to the top of the tubular part and provided with display instruments and an input hole; The material conveying assembly includes a pumping assembly and a first annular sheet; the first annular sheet is a rubber annular sheet body, with upper and lower edges fixed to the inner wall of the tubular part to form a ring-shaped space together with the inner wall of the outer shell, and the pumping assembly is in communication with the space; the first annular sheet is located at a lower position of the tubular part; The isolation pipe assembly includes an isolation pipe and a positioning and clamping body; The isolation pipe is an elastic pipe made of rubber, most of which is located inside the outer shell; the end of the isolation pipe is clamped and fixed to the positioning and clamping body; The positioning and clamping body is a combination of several clamps evenly distributed on the outer lateral wall of the tubular part, which is located at a position close to the top of the tubular part; The material conveying assembly includes a pump body, a valve body, and a conveying pipe; The valve body is positioned on the pump body and is a switching valve controlled by a control unit; The conveying pipe is positioned on the valve body and serves to convey fluid medium; The pump body is in communication with the input hole through the conveying pipe; The tubular part is a hard straight pipe; The conical part is a horn-shaped with a large upper and a small lower, and its appearance is inverted conical, in communication with the internal space of the tubular part; The combined part is a straight pipe for assembling the outer shell with a detection and pressure compensation pipe; The outer shell is also provided with an air extraction hole and an air extraction pipe, and the air extraction pipe is provided with a gas pressure instrument; The air extraction hole is located on the tubular part and below the first annular sheet, serving as a gas passage; the first annular sheet is shielded by the isolation pipe before it expands, and the air extraction hole is exposed when the first annular sheet expands; The air extraction pipe is fixed to the outer wall of the tubular part and is in communication with the air extraction hole; The air extraction pipe is in communication with the valve body through the conveying pipe; the gas pressure instrument is used to detect the air pressure value in the air extraction pipe.

2. The bridge prestressing duct grouting device of claim 1, wherein: The number of pump bodies is multiple, at least one of which is a gas pump; the fluid medium pumped into the annular space formed together with the inner wall of the outer shell is gas or liquid.

3. The bridge prestressing duct grouting device of claim 1, wherein: The inner wall of the tubular part is also positioned with a second annular sheet, which has the same structure as the first annular sheet, with upper and lower edges fixed to the inner wall of the tubular part to form a ring-shaped space together with the inner wall of the outer shell, and the pumping assembly is in communication with the space; the second annular sheet is located at a middle position of the tubular part.

4. The bridge prestressing duct grouting apparatus of claim 3, wherein: After injecting slurry into the outer shell, place a shock capsule on the slurry, and promote the shock capsule to expand and contract by alternating the air pressure above the slurry, so as to hit the slurry and eliminate part of the air bubbles in the slurry; the shock capsule is a circular pie-shaped elastic air bag.

5. The bridge prestressing duct grouting apparatus of claim 3, wherein: The inner wall of the tubular part is also positioned with a third annular sheet, which has the same structure as the first annular sheet, with upper and lower edges fixed to the inner wall of the tubular part to form a ring-shaped space together with the inner wall of the outer shell, and the pump body is in communication with the space through the conveying pipe; The third annular sheet is located at a position close to the top of the tubular part; The third annular sheet includes a first elastic part and a second elastic part, both of which are annular and made of the same material; The first elastic part has a thickness of less than one-half of the second elastic part and a width of less than one-third of the second elastic part, and the first elastic part is located on the top of the second elastic part.

6. The bridge post-tensioning duct grouting apparatus of claim 1, wherein: The closure assembly is positioned in a space formed by the first annular sheet and the inner wall of the outer shell, and includes an adsorption body, a positioning body, and a positioning rope, which are one-to-one corresponding; The adsorption body is an ellipsoidal body, one end of which is provided with a permanent magnet, and an electromagnet is fixed inside; the permanent magnet is adsorbed on the positioning body in a normal state; the operation of the electromagnet is controlled by a control unit; The positioning body is an iron block or an iron sheet, which is fixed at a position close to the middle of the first annular sheet and is made of ferromagnetic material; One end of the positioning rope is fixed to the other end of the adsorption body, and the other end is fixed to the inner wall of the outer shell; The number of the adsorption body, the positioning body, and the positioning rope is four, which are symmetrically arranged in pairs; after the first annular sheet separates the space inside the outer shell, the control unit controls the electromagnet to be electrified, so that the adsorption bodies are adsorbed together in an interleaved manner, and then the linear gap formed after the first annular sheet is expanded is squeezed into a curved shape.

7. The bridge prestressing duct grouting apparatus of claim 6, wherein: The positioning rope is an elastic rope.

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