A vacuum-assisted circulating grouting device for prefabricated box beams

Abstract

The present invention discloses a prefabricated box girder vacuum-assisted circulating grouting device, comprising: a grouting system, a transmission system and a negative pressure system, wherein the transmission system comprises a series pipeline for connecting in series and connecting all prestressed tendon channels that need grouting, the grouting end of the series pipeline is connected to the negative pressure system through an output pipe, and the grouting end of the series pipeline is connected to the grouting system through an input pipe. The prefabricated box girder vacuum-assisted circulating grouting device provided by the present invention can realize one-time vacuuming in all prestressed tendon channels, and can realize separate pressure regulation of cement slurry in a single prestressed tendon channel by opening and closing the series valve and the parallel valve, which can significantly improve the density of grouting in the prestressed channel of the prefabricated box girder of the bridge, avoid hydration heat, and improve the bonding strength between the prestressed tendon and concrete, thereby improving the safety and durability of the bridge.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering construction, and more specifically to a vacuum-assisted circulating grouting device for a prefabricated box girder. Background Art

[0002] The quality of grouting construction for the short-beam prestressed tendons of prefabricated box girders in bridge projects directly affects the safety and reliability of bridges. However, the current grouting technology causes water and air in the duct to mix with the cement slurry to form bubbles, resulting in insufficient grouting density, which seriously affects the construction quality. In addition, in order to achieve a dense effect, excessive grouting with conventional technology leads to a large amount of slurry waste, polluting the environment and increasing costs.

[0003] The vacuum-assisted circulating grouting construction technology for prefabricated box girders of bridges has obvious advantages over ordinary grouting. Under vacuum conditions, the pressure difference caused by the high and low bending of the channel is reduced, making it easier for the slurry to fill the entire channel, especially for curved, U-shaped, and extra-long channels, where the application effect is more obvious. Under vacuum conditions, the air, moisture, and bubbles mixed in the cement slurry in the channel are eliminated, reducing the slurry porosity and water seepage. Due to the positive and negative pressure difference between the channel and the grouting machine, the fullness and density of the channel grouting are greatly improved. The process optimization uses a smaller water-cement ratio, which effectively reduces the water seepage and shrinkage of the cement slurry, eliminates the generation of cracks, and ensures the fullness and strength of the grouting. The vacuum-assisted circulating grouting process is a continuous and rapid process. A steel pipe with a thread on one end and a connecting hose are used to connect the prestressed channels of the prefabricated box girder through the grouting hole to form a closed channel, shortening the grouting time and improving work efficiency.

[0004] At present, there are few studies on the grouting technology for prestressed tendon holes in precast bridge beams. The bridge construction quality requirements are high and the technology is difficult. A set of strict construction methods are needed to ensure the construction quality. The existing grouting technology for prestressed tendon holes in bridges cannot achieve a complete vacuum state in the hole. Bubbles are easily generated in the hole, affecting the density of the grouting and thus affecting the construction quality. The current technology has a serious waste of slurry, which not only pollutes the environment but also increases construction costs. In addition, the conventional method has high temperature and is prone to water seepage.

[0005] In summary, how to reduce the bubbles generated during grouting of prestressed tendon ducts, reduce environmental pollution, and prevent water seepage is an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0006] In view of this, the object of the present invention is to provide a vacuum-assisted circulating grouting device for prefabricated box beams which can generate no bubbles, less pollution and no water seepage when grouting into the prestressed tendon ducts.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A vacuum-assisted circulating grouting device for prefabricated box beams, comprising: a grouting system, a transmission system and a negative pressure system, wherein the transmission system comprises a series pipeline for connecting in series and connecting all prestressed tendon ducts that need grouting, the grouting end of the series pipeline is connected to the negative pressure system through an output pipe, and the grouting end of the series pipeline is connected to the grouting system through an input pipe;

[0009] The series pipelines of the slurry inlet of the Nth prestressed tendon channel and the slurry outlet of the N+1th prestressed tendon channel are connected with a parallel pipeline, and N is an odd number;

[0010] The series pipelines at both ends of each prestressed tendon channel are provided with series valves that can be opened and closed to prevent the inflow or outflow of the prestressed tendon channel, and each parallel pipeline is provided with a parallel valve that can be opened and closed;

[0011] When the total number of prestressed tendon channels is an even number, the connection end of the output pipe connected to the parallel pipeline is arranged on the series pipeline between the series valve and the prestressed tendon channel, and the remaining series valves are arranged between the end of the parallel pipeline connected to the series pipeline and the prestressed tendon channel;

[0012] When the total number of prestressed tendon ducts is an odd number, all the series valves are respectively arranged between the end of the series pipe connected to the parallel pipeline and the prestressed tendon duct;

[0013] At least one of the series pipelines at both ends of each prestressed tendon channel is provided with a pressure gauge, and each of the pressure gauges is arranged between the two series valves on the series pipeline where it is located.

[0014] Preferably, the transmission system comprises an anchor plate embedded in the end of the prestressed tendon channel, and an anchor for supporting the series pipeline inserted into the end of the prestressed tendon channel is provided on the outer side of the anchor plate.

[0015] Preferably, the series pipeline includes a connecting pipe, a flexible joint and a transmission pipe, one end of the connecting pipe is inserted into the end of the prestressed tendon channel, and the other end is detachably connected to the flexible joint, and the flexible joint is also detachably connected to the transmission pipe. The series valve is arranged on the flexible joint, and the grouting end of the series pipeline is connected to the input pipe through the flexible joint, and the grouting end is connected to the output pipe through the flexible joint.

[0016] Preferably, the output pipe is a transparent high-pressure pipe.

[0017] Preferably, both the series valve and the parallel valve are ball valves.

[0018] Preferably, the grouting system comprises a base, a mixer for stirring mud, and a grouting press for outputting mud, the mixer is arranged on the base, the mixer is connected to the grouting press, and the grouting press is connected to the input pipe.

[0019] Preferably, a slurry storage barrel is provided between the mixer and the grouting machine, the mixer is connected to the slurry storage barrel via a first slurry outlet pipe, and the grouting machine is connected to the grouting machine via a second slurry outlet pipe.

[0020] Preferably, the second slurry outlet pipe is provided with an openable and closable slurry outlet valve.

[0021] The grouting system is used to manufacture and transfer cement slurry, the negative pressure system is used to extract the air in the prestressed tendon duct to form a negative pressure state in the prestressed tendon duct, and the transmission system is used to connect the prestressed tendon duct with the negative pressure system and the grouting system respectively.

[0022] When grouting into the prestressed tendon duct, first open the series valves on all series pipelines and close the parallel valves. At this time, the grouting system does not work and there is no cement slurry output. Open the negative pressure system, and the air in all prestressed tendon ducts can be extracted to make all prestressed tendon ducts in a vacuum state. Observe the value of the pressure gauge. When the pressure value that can be grouted is reached, open the grouting system and grout into the prestressed tendon duct. When the cement slurry reaches the output pipe and the consistency is basically the same as the slurry consistency pressed in, close the negative pressure system.

[0023] The advantage of setting up a series pipeline to connect all the prestressed tendon channels in series is that cement slurry can be introduced into all the prestressed tendon channels at one time.

[0024] When the density of cement slurry in the Mth prestressed tendon channel needs to be adjusted, the series valves of the slurry inlet and outlet of the Mth prestressed tendon channel are opened;

[0025] When M=1, close the parallel valve of the parallel pipeline connected to the grout inlet of the first prestressed tendon channel and the series valve of the grout inlet of the second prestressed tendon channel, and inject grout into the first prestressed tendon channel. Observe the value of the pressure gauge on the series pipeline connected to the first prestressed tendon channel. When it reaches the standard value and lasts for 2-4 minutes, adjust the density of the cement slurry in the next prestressed tendon channel.

[0026] When M>2 and is an odd number, close the series valve of the slurry outlet of the M-1th prestressed tendon channel and the series valve of the slurry inlet of the M+1th prestressed tendon channel, open the parallel valves on the parallel pipelines parallel to the slurry inlet of the M-1th prestressed tendon channel and all parallel pipelines between the parallel pipelines parallel to the slurry inlet of the M-1 prestressed tendon channel and the input pipe, close the parallel valves on the parallel pipelines parallel to the slurry inlet of the Mth prestressed tendon channel, inject grout into the Mth prestressed tendon channel, observe the value of the pressure gauge on the series pipeline connected to the Mth prestressed tendon channel, and when the standard value is reached and lasts for 2-4 minutes, adjust the density of the cement slurry in the next prestressed tendon channel.

[0027] When M≥2 and is an even number, close the series valves of the slurry inlet and outlet of the M-1th prestressed tendon channel, and close the series valve of the slurry inlet of the M+1th prestressed tendon channel, open the parallel valve on the parallel pipeline parallel to the slurry inlet of the Mth prestressed tendon channel, and open the parallel valves on all parallel pipelines between the parallel pipeline parallel to the slurry inlet of the Mth prestressed tendon channel and the input pipe, close the parallel valve of the parallel pipeline parallel to the slurry inlet of the M+1th prestressed tendon channel, inject grout into the Mth prestressed tendon channel, observe the value of the pressure gauge on the series pipeline connected to the Mth prestressed tendon channel, and when it reaches the standard value and lasts for 2-4 minutes, adjust the density of the cement slurry in the next prestressed tendon channel.

[0028] The vacuum-assisted circulating grouting device for prefabricated box girders provided by the present invention can realize one-time vacuum extraction in all prestressed tendon ducts, and can realize individual pressure regulation of cement slurry in a single prestressed tendon duct by opening and closing the series valve and the parallel valve, which can significantly improve the density of grouting in the prestressed duct of the prefabricated box girder of the bridge, avoid hydration heat, and improve the bonding strength between the prestressed tendons and concrete, thereby improving the safety and durability of the bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0030] Figure 1 A schematic diagram of a grouting system provided by the present invention;

[0031] Figure 2 A schematic diagram of a transmission system and a negative pressure system provided by the present invention;

[0032] Figure 3This is a schematic diagram of the interconnection of the input pipe, the series pipeline, and the parallel pipeline provided by the present invention.

[0033] Figure 1-3 middle:

[0034] 1-base, 2-mixer, 3-first slurry outlet pipe, 4-slurry storage barrel, 5-slurry outlet valve, 6-grouting machine, 7-input pipe, 8-series valve, 9-parallel valve, 10-parallel pipeline, 11-series pipeline, 12-waste paddle barrel, 13-negative pressure container, 14-vacuum pump, 15-prestressed tendon channel, 16-pressure gauge, 17-slip joint, 18-anchor, 19-connecting pipe, 20-anchor plate. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The core of the present invention is to provide a vacuum-assisted circulating grouting device for prefabricated box beams which has no bubbles, little pollution and no water seepage when grouting into the prestressed tendon duct.

[0037] Please refer to Figures 1 to 3 , Figure 1 A schematic diagram of a grouting system provided by the present invention; Figure 2 A schematic diagram of a transmission system and a negative pressure system provided by the present invention; Figure 3 This is a schematic diagram of the interconnection of the input pipe, the series pipeline, and the parallel pipeline provided by the present invention.

[0038] A vacuum-assisted circulating grouting device for prefabricated box beams, comprising: a grouting system, a transmission system and a negative pressure system, wherein the transmission system comprises a series pipeline 11 for connecting in series and connecting all prestressed tendon channels 15 that need grouting, the grouting end of the series pipeline 11 is connected to the negative pressure system through an output pipe, and the grouting end of the series pipeline 11 is connected to the grouting system through an input pipe 7; a parallel pipeline 10 is connected to the series pipeline 11 of the grouting inlet of the Nth prestressed tendon channel 15 in series and the grouting outlet of the N+1th prestressed tendon channel 15, where N is an odd number; the series pipelines 11 at both ends of each prestressed tendon channel 15 are provided with a series valve 8 that can be opened and closed to prevent the entry or outflow of the prestressed tendon channel 15, and each of the parallel pipelines 10 is provided with a parallel valve that can be opened and closed 9; When the total number of the prestressed tendon channels 15 is an even number, the connection end of the output pipe connected to the parallel pipeline 10 is arranged on the series pipeline 11 between the series valve 8 and the prestressed tendon channel 15, and the remaining series valves 8 are arranged between the end of the parallel pipeline 10 connected to the series pipeline 11 and the prestressed tendon channel 15; When the total number of the prestressed tendon channels 15 is an odd number, all the series valves 8 are respectively arranged between the end of the series pipe connected to the parallel pipeline 10 and the prestressed tendon channel 15; At least one of the series pipelines 11 at both ends of each prestressed tendon channel 15 is provided with a pressure gauge 16, and each of the pressure gauges 16 is arranged between two series valves 8 on the series pipeline 11 where it is located.

[0039] It should be noted that the grouting system is used to manufacture and transfer cement slurry, the negative pressure system is used to extract the air in the prestressed tendon channel 15 to form a negative pressure state in the prestressed tendon channel 15, and the transmission system is used to connect the prestressed tendon channel 15 to the negative pressure system and the grouting system respectively.

[0040] When grouting into the prestressed tendon duct 15, first open the series valve 8 on all series pipelines 11 and close the parallel valve 9. At this time, the grouting system does not work and no cement slurry is output. The negative pressure system is turned on, and the air in all prestressed tendon ducts 15 can be extracted to make all prestressed tendon ducts 15 in a vacuum state. Observe the value of the pressure gauge 16. When the pressure value that can be grouted is reached, open the grouting system and grout into the prestressed tendon duct 15. When the cement slurry reaches the output pipe and the consistency is basically the same as the consistency of the pressed slurry, close the negative pressure system.

[0041] The advantage of setting the series pipeline 11 to connect all the prestressed tendon channels 15 in series is that cement slurry can be introduced into all the prestressed tendon channels 15 at one time.

[0042] When it is necessary to adjust the density of the cement slurry in the Mth prestressed tendon channel 15, open the series valve 8 of the slurry inlet and outlet of the Mth prestressed tendon channel 15. When M=1, close the parallel valve 9 of the parallel pipeline 10 connected in parallel to the slurry inlet of the first prestressed tendon channel 15 and the series valve 8 of the slurry inlet of the second prestressed tendon channel 15, and grouting is performed into the first prestressed tendon channel 15. Observe the value of the pressure gauge 16 on the series pipeline 11 connected to the first prestressed tendon channel 15. When it reaches the standard value and lasts for 2-4 minutes, adjust the density of the cement slurry in the next prestressed tendon channel 15.

[0043] When M>2 and is an odd number, close the series valve 8 of the slurry outlet of the M-1th prestressed tendon channel 15 and the series valve 8 of the slurry inlet of the M+1th prestressed tendon channel 15, open the parallel valves 9 on the parallel pipeline 10 connected in parallel to the slurry inlet of the M-1th prestressed tendon channel 15 and all the parallel pipelines 10 between the parallel pipeline 10 connected in parallel to the slurry inlet of the M-1th prestressed tendon channel 15 and the input pipe 7, close the parallel valve 9 on the parallel pipeline 10 connected in parallel to the slurry inlet of the Mth prestressed tendon channel 15, inject grout into the Mth prestressed tendon channel 15, observe the value of the pressure gauge 16 on the series pipeline 11 connected to the Mth prestressed tendon channel 15, and when the standard value is reached and lasts for 2-4 minutes, adjust the density of the cement slurry in the next prestressed tendon channel 15. At this time, M is an odd number.

[0044] When M≥2 and is an even number, close the series valves 8 of the slurry inlet and outlet of the M-1th prestressed tendon channel 15, and close the series valve 8 of the slurry inlet of the M+1th prestressed tendon channel 15, open the parallel valve 9 on the parallel pipeline 10 parallel to the slurry inlet of the Mth prestressed tendon channel 15, and open the parallel valves 9 on all parallel pipelines 10 between the parallel pipeline 10 parallel to the slurry inlet of the Mth prestressed tendon channel 15 and the input pipe 7, close the parallel valve 9 of the parallel pipeline 10 parallel to the slurry inlet of the M+1th prestressed tendon channel 15, grouting into the Mth prestressed tendon channel 15, observe the value of the pressure gauge 16 on the series pipeline 11 connected to the Mth prestressed tendon channel 15, and when it reaches the standard value and lasts for 2-4 minutes, adjust the density of the cement slurry in the next prestressed tendon channel 15. At this time, M is an even number.

[0045] The vacuum-assisted circulating grouting device for prefabricated box girders provided by the present invention can realize one-time vacuum extraction in all prestressed tendon ducts 15, and can realize individual pressure regulation of cement slurry in a single prestressed tendon duct 15 by opening and closing the series valve 8 and the parallel valve 9, which can significantly improve the density of grouting in the prestressed ducts of the prefabricated box girders of the bridge, avoid hydration heat, and improve the bonding strength between the prestressed tendons and concrete, thereby improving the safety and durability of the bridge.

[0046] On the basis of the above embodiment, as a further preference, the transmission system includes an anchor plate 20 embedded in the end of the prestressed tendon channel 15, and an anchor 18 for supporting the series pipeline 11 inserted into the end of the prestressed tendon channel 15 is provided on the outer side of the anchor plate 20. It should be noted that the anchor 18 is arranged at the end of the prestressed tendon channel 15 and embedded in the prestressed tendon channel 15, and is welded to the anchor plate 20. The series pipeline 11 is inserted on the anchor plate 20. The anchor plate 20 is provided with a through hole connected to the inside of the prestressed tendon channel 15, and the series pipeline 11 is connected to the through hole. The anchor 18 arranged below the series pipeline 11 supports the series pipeline 11. In this embodiment, the series pipeline 11 and the prestressed tendon channel 15 can be stably connected by arranging the anchor plate 20 and the anchor 18.

[0047] On the basis of the above embodiment, as a further preference, the series pipeline 11 includes a connecting pipe 19, a flexible joint 17 and a transmission pipe, one end of the connecting pipe 19 is inserted into the end of the prestressed tendon channel 15, and the other end is detachably connected to the flexible joint 17, the flexible joint 17 is also detachably connected to the transmission pipe, the series valve 8 is arranged on the flexible joint 17, the grouting end of the series pipeline 11 is connected to the input pipe 7 through the flexible joint 17, and the grouting end is connected to the output pipe through the flexible joint 17. It should be noted that the transmission pipe is a hose, and both ends of the connecting pipe 19 are provided with external threads, one end of the connecting pipe 19 is connected to the anchor plate 20, and the other end is threadedly connected to the flexible joint 17, the flexible joint 17 is connected to the transmission pipe, and the series valve 8 is integrally arranged with the flexible joint 17. This embodiment has a simple structure, and the connection and sealing between the connecting pipe 19, the flexible joint 17 and the transmission pipe are good.

[0048] On the basis of the above embodiment, as a further preferred embodiment, the negative pressure system includes a vacuum pump 14, a negative pressure container 13 and a waste paddle barrel 12, the vacuum pump 14 is connected to the negative pressure container 13 through a first pipeline, the negative pressure container 13 is connected to the waste paddle barrel 12 through a second pipeline, the output pipe is connected to the second pipeline, and valves are provided at both ends of the second pipeline. It should be noted that when the vacuum pump 14 is evacuated, the valve at one end of the second pipeline connected to the negative pressure container 13 is opened, and the valve at the second pipeline connected to the waste paddle barrel 12 is closed. When the cement slurry reaches the output pipe, the valve at one end of the second pipeline connected to the negative pressure container 13 is closed, and the valve at the second pipeline connected to the waste paddle barrel 12 is opened, so that the cement slurry injected first enters the waste paddle barrel 12, and the state of the slurry in the waste paddle barrel 12 is observed. When the state of the cement slurry in the waste paddle barrel 12 is consistent with the state of the slurry discharged by the grouting system, the series valve 8 of the series pipeline 11 connected to the output pipe is closed.

[0049] Based on the above embodiment, as a further preference, the output pipe is a transparent high-pressure pipe. By providing the transparent high-pressure pipe, the position and state of the cement slurry in the output pipe can be observed, thereby facilitating the operation of the negative pressure system and preventing the cement slurry from entering the negative pressure container 13.

[0050] Based on the above embodiment, as a further preference, the series valve 8 and the parallel valve 9 are both ball valves. The ball valve has a long service life, low cost, wear resistance, good sealing performance, and is conducive to adjusting the density of cement slurry in sections.

[0051] On the basis of the above embodiment, as a further preferred embodiment, the grouting system includes a base 1, a mixer 2 for stirring mud, and a grouting machine 6 for outputting mud, wherein the mixer 2 is arranged on the base 1, the mixer 2 is connected to the grouting machine 6, and the grouting machine 6 is connected to the input pipe 7. It should be noted that the base 1 can be any structure, which is used to support and fix the mixer 2, the mixer 2 is used to stir cement slurry, the mixer 2 inputs the stirred cement slurry into the grouting machine 6, and the grouting machine 6 uses pressure to press the cement slurry into the input pipe 7. This embodiment has a simple structure and is easy to install and operate.

[0052] On the basis of the above embodiment, as a further preference, a slurry storage barrel 4 is provided between the mixer 2 and the grouting machine 6, the mixer 2 is connected to the slurry storage barrel 4 through the first slurry outlet pipe 3, and the grouting machine 6 is connected to the grouting machine 6 through the second slurry outlet pipe. It should be noted that the slurry storage barrel 4 can store the cement slurry stirred by the mixer 2, and can prevent the mixer 2 from stirring too much slurry and inputting it into the grouting machine 6, which makes the grouting machine 6 unable to bear it.

[0053] On the basis of the above embodiment, as a further preference, the second slurry outlet pipe is provided with an openable and closable slurry outlet valve 5. When slurrying is required, the slurry outlet valve 5 is opened, and when slurrying is not required, the slurry outlet valve 5 is closed, and the time of slurrying and stopping slurrying can be controlled, which can save slurry and will not cause waste.

[0054] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0055] The above is a detailed introduction to the vacuum-assisted circulating grouting device for prefabricated box girders provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A vacuum-assisted circulating grouting device for prefabricated box beams, characterized in that: It comprises: a grouting system, a transmission system and a negative pressure system, wherein the transmission system comprises a series pipeline (11) for connecting in series and connecting all prestressed tendon ducts (15) that require grouting, the grouting end of the series pipeline (11) is connected to the negative pressure system via an output pipe, and the grouting end of the series pipeline (11) is connected to the grouting system via an input pipe (7); The series pipeline (11) of the slurry inlet of the Nth prestressed tendon hole (15) and the slurry outlet of the N+1th prestressed tendon hole (15) is connected to a parallel pipeline (10), where N is an odd number; The series pipelines (11) at both ends of each prestressed tendon channel (15) are provided with series valves (8) that can be opened and closed and are used to prevent cement slurry in the prestressed tendon channel (15) from entering or flowing out, and each parallel pipeline (10) is provided with a parallel valve (9) that can be opened and closed; When the total number of the prestressed tendon holes (15) is an even number, the connection end of the output pipe connected to the parallel pipeline (10) is arranged on the series pipeline (11) between the series valve (8) and the prestressed tendon hole (15), and the remaining series valves (8) are arranged between the end of the parallel pipeline (10) connected to the series pipeline (11) and the prestressed tendon hole (15); When the total number of prestressed tendon ducts (15) is an odd number, all of the series valves (8) are respectively arranged between the end of the series pipeline (11) connected to the parallel pipeline (10) and the prestressed tendon duct (15); At least one of the series pipelines (11) at both ends of each prestressed tendon channel (15) is provided with a pressure gauge (16), and each of the pressure gauges (16) is arranged between the two series valves (8) on the series pipeline (11) where it is located.

2. The vacuum-assisted circulating grouting device for prefabricated box beams according to claim 1 is characterized in that: The transmission system comprises an anchor plate (20) embedded in the end of a prestressed tendon channel (15), and an anchor (18) for supporting the series pipeline (11) inserted into the end of the prestressed tendon channel (15) is provided on the outer side of the anchor plate (20).

3. The vacuum-assisted circulating grouting device for prefabricated box beams according to claim 2 is characterized in that: The series pipeline (11) comprises a connecting pipe (19), a flexible joint (17) and a transmission pipe. One end of the connecting pipe (19) is inserted into the end of the prestressed tendon channel (15), and the other end is detachably connected to the flexible joint (17). The flexible joint (17) is also detachably connected to the transmission pipe. The series valve (8) is arranged on the flexible joint (17). The grouting end of the series pipeline (11) is connected to the input pipe (7) through the flexible joint (17), and the grouting end is connected to the output pipe through the flexible joint (17).

4. The vacuum-assisted circulating grouting device for prefabricated box beams according to claim 1 is characterized in that: The output pipe is a transparent high-pressure pipe.

5. The vacuum-assisted circulating grouting device for prefabricated box beams according to claim 1 is characterized in that: The series valve (8) and the parallel valve (9) are both ball valves.

6. The vacuum-assisted circulating grouting device for prefabricated box beams according to any one of claims 1 to 5, characterized in that: The grouting system comprises a base (1), a mixer (2) for stirring mud, and a grouting machine (6) for outputting mud, wherein the mixer (2) is arranged on the base (1), the mixer (2) is connected to the grouting machine (6), and the grouting machine (6) is connected to the input pipe (7).

7. The vacuum-assisted circulating grouting device for prefabricated box beams according to claim 6 is characterized in that: A slurry storage barrel (4) is provided between the mixer (2) and the grouting machine (6); the mixer (2) is connected to the slurry storage barrel (4) via a first slurry outlet pipe (3); and the grouting machine (6) is connected to the grouting machine (6) via a second slurry outlet pipe.

8. The vacuum-assisted circulating grouting device for prefabricated box beams according to claim 7 is characterized in that: The second slurry outlet pipe is provided with an openable and closable slurry outlet valve (5).

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