An automatic grouting device for prefabricated prestressed channel of box beam

Abstract

The invention relates to the technical field of prestressed channel grouting, and specifically to an automatic grouting feeding device for prefabricated prestressed channel of a box girder body, comprising a box girder body, a plurality of grouting ports arranged on the box girder body and a grouting pipe for injecting slurry into the grouting ports, and also comprising a one-way valve arranged at the pipe mouth of the grouting pipe and a connecting unit for connecting the grouting port and the grouting pipe, the connecting unit comprising a connecting pipe coaxially fixedly arranged on each grouting port, a plugging mechanism for closing or opening the grouting port and a triggering mechanism for enabling the plugging mechanism to open the grouting port, the plugging mechanism and the triggering mechanism are both arranged in the connecting pipe, the triggering mechanism comprises a triggering pipe coaxially elastically slidably arranged in the connecting pipe, the triggering pipe is transmission-connected to the plugging mechanism, the valve core of the one-way valve is transmission-connected to the triggering pipe, the grouting pipe is connected to the connecting pipe by a thread, and the device can automatically close or open the grouting port during grouting, thereby saving grouting time and improving grouting efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of prestressed channel grouting, and in particular to an automatic feeding device for grouting of prefabricated prestressed channel of a box beam. Background Art

[0002] Prestressed pipes are also called bellows. The density of their grouting has an important impact on the durability of bridges. According to statistics, due to the lack of grouting, the steel strands in the prestressed pipes are corroded and the prestress is lost in advance, which can shorten the actual life of the bridge to one tenth of the design life. In order to strengthen the process control of bridge construction quality and eliminate quality defects in the construction process, the grouting quality inspection of prestressed pipes (bellows) of prestressed bridges is an important control link to ensure that the bridge construction quality meets the design requirements and reasonable stress state. The steel strands of prestressed bridges must offset the pressure of vehicles and pedestrians on the bridge deck. The grouting quality of prestressed pipes is one of the most important factors. Grouting quality that meets the design requirements can make the prestressed steel strands fully play their role; when there are grouting quality defects, there will be stress concentration of the anchor head and loss of prestress over time, and it will change the design stress state of the beam body, reduce the bearing capacity of the bridge, and thus affect the service life of the bridge. The following precautions should be taken for grouting of existing prestressed channels: 1. Use special grouting materials for grouting, and the water-cement ratio should meet the design requirements and be mixed evenly; 2. Through the grouting hole of the box girder anchor plate, one end is connected to the grouting pump, and the other end is connected to the adjacent channel with a grouting pipe. Before grouting, it is necessary to ensure that the channel is clean and unobstructed. Grouting should be carried out from bottom to top and from low to high, slowly and evenly, and should not be interrupted; 3. During the grouting process and within 48 hours after grouting, the temperature of the concrete of the structure or component and the ambient temperature shall not be lower than 5°C, otherwise insulation measures should be taken. When the ambient temperature is higher than 35°C, grouting should be carried out at night; 4. Wait for the output When qualified slurry overflows from the mouth, stop grouting, close the outlet valve, stabilize the pressure at 0.5-0.7MPa, and after stabilizing the pressure for 3 to 5 minutes, seal the grouting hole and complete the grouting; 5. After the grouting is completed, the concrete at the end of the beam should be roughened in time and rinsed clean. The roughening depth should be controlled at 5mm, and the aggregate on the roughened surface should be visible. At the same time, a steel mesh should be set at the end of the beam, and the end-sealing concrete should be poured; 6. After the strength of the grouting and end-sealing concrete meets the requirements, the beam should be placed on the inspection table for inspection. Only after it is qualified can it be moved to the beam storage area, and the beam slab should be sprayed with a unified logo and number. The beam stack should not be stacked in more than two layers, and the storage time of the prefabricated beam should not exceed 90 days. In the above grouting process, the operation of sealing the grouting hole after stabilizing the pressure is traditionally to remove the grouting pipe and then seal it. However, after the grouting pipe is removed, the slurry from the grouting port will flow out, causing the slurry from the grouting port to be lost. Therefore, a new type of grouting device is needed to improve the grouting quality of the box girder. Summary of the invention

[0003] Based on this, it is necessary to provide an automatic grouting device for prefabricated prestressed ducts of box girders in response to the existing technical problems.

[0004] To solve the problems of the prior art, the technical solution adopted by the present invention is: an automatic grouting feeding device for prefabricated prestressed channels of a box girder, comprising a box girder body, a plurality of grouting ports arranged on the box girder body and a grouting pipe for injecting slurry into the grouting ports, and also comprising a one-way valve arranged at the pipe mouth of the grouting pipe and a connecting unit for connecting the grouting port and the grouting pipe, the connecting unit comprising a connecting pipe coaxially fixedly arranged on each grouting port, a blocking mechanism for closing or opening the grouting port and a triggering mechanism for enabling the blocking mechanism to open the grouting port, the blocking mechanism and the triggering mechanism are both arranged in the connecting pipe, the triggering mechanism comprises a triggering pipe coaxially elastically slidably arranged in the connecting pipe, the triggering pipe is transmission-connected to the blocking mechanism, the valve core of the one-way valve is transmission-connected to the triggering pipe, and the grouting pipe is threadedly connected to the connecting pipe.

[0005] Furthermore, the sealing mechanism includes a supporting pipe seat coaxially fixed on the grouting port, a connecting ring plate coaxially fixed on the supporting pipe seat, a rotating ring plate rotatably arranged on the connecting ring plate, and a plurality of sealing blocks annularly slidably arranged on the connecting ring plate, each sealing block is transmission-connected to the rotating ring plate, and the rotating ring plate is transmission-connected to the trigger tube.

[0006] Furthermore, the connecting ring plate is provided with a plurality of limit slideways in a ring shape along its axis, the rotating ring plate is provided with a plurality of limit waist holes in a ring shape along its axis, a sliding block is provided on one side of each blocking block, and a sliding column is fixedly provided on the side of each blocking block away from the sliding block, the sliding column corresponds one-to-one to the limit waist hole and slides in cooperation, and the limit slideways correspond one-to-one to the sliding block and slides in cooperation.

[0007] Furthermore, the trigger mechanism also includes a receiving tube coaxially fixed on the rotating ring plate, a sliding tube coaxially elastically slidably arranged in the connecting tube, a mounting ring coaxially fixed on the sliding tube, a limit box symmetrically fixed on the mounting ring, a transfer tube fixed in the two limit boxes and a limit sleeve coaxially fixed on the transfer tube; the trigger tube is coaxially elastically connected to the limit sleeve; a plurality of spiral slideways are annularly provided on the outer wall of the receiving tube; a plurality of limit columns are annularly fixed on the inner wall of the sliding tube; the limit columns correspond one to one with the spiral slideways and slide in cooperation with each other.

[0008] Furthermore, a positioning column is coaxially fixed on the valve core of the one-way valve, a guide slope is provided at the port of the positioning column, a connecting ring groove is opened on the inner wall of the positioning column, a connecting short column is coaxially fixed on the trigger tube, a locking ring is coaxially rotatably provided on the connecting short column, and the size of the locking ring matches the size of the connecting ring groove.

[0009] Furthermore, two positioning grooves are symmetrically provided on the inner wall of the connecting tube, and two positioning blocks are symmetrically arranged on the sliding tube. The positioning blocks correspond to the positioning grooves one by one and slide together. A mounting short plate is fixedly provided at the end of each positioning groove, and a return spring is provided on each mounting short plate. The two ends of the return spring connect the positioning block and the mounting short plate.

[0010] Furthermore, a limiting slide groove is symmetrically provided on the inner wall of the limiting sleeve, and a limiting slide bar is symmetrically provided on the outer wall of the trigger tube. The limiting slide bar corresponds one to one with the limiting slide groove and slides in cooperation with the limiting slide groove. A limiting ring is coaxially fixed on the end of the limiting sleeve, and a limiting spring is coaxially provided in the transfer tube. Both ends of the limiting spring are connected to the trigger tube and the transfer tube.

[0011] Furthermore, a locking hole is provided on each positioning slide groove, a locking rod is slidably arranged in each limit box, the locking rod passes through the positioning block, a pressure spring is coaxially sleeved on each locking rod, one end of the pressure spring is connected to the limit box, and the other end is connected to the locking rod, and inclined plates are fixedly arranged at the ends of the two locking rods that are close to each other, inclined blocks are symmetrically fixed on the inner wall of the trigger tube, the size of the locking rod matches the size of the locking hole, a positioning tube is coaxially fixed on the sliding tube, the outer wall of the positioning tube is dynamically sealed with the inner wall of the grouting pipe, and the elastic force of the limit spring is less than the elastic force of the reset spring.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] Firstly, the device changes the connection mode between the grouting port and the grouting pipe, so that after the grouting pipe is inserted, the grouting port automatically opens, and after the grouting pipe is removed, the grouting port automatically closes, thereby improving the quality of the box beam grouting, saving the workload of the staff, and thus improving the grouting efficiency;

[0014] Second, the device has a purely mechanical structure, so that the grouting port is automatically opened when the grouting starts, and can be firmly closed after the grouting is completed, so that the grouting can be carried out continuously and the grouting time can be saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the three-dimensional structure of an embodiment;

[0016] Figure 2 It is a three-dimensional structural schematic diagram of a grouting pipeline and a connecting pipe of an embodiment;

[0017] Figure 3 yes Figure 2 A schematic diagram of the structure enlargement in the middle;

[0018] Figure 4 is a side view of an embodiment;

[0019] Figure 5 yes Figure 4Sectional view along the middle line BB;

[0020] Figure 6 yes Figure 5 A magnified schematic diagram of the structure at C in the middle;

[0021] Figure 7 is a schematic diagram of the three-dimensional structure of the connecting pipe of the embodiment;

[0022] Figure 8 is a three-dimensional structural cross-sectional view of a connection unit of an embodiment;

[0023] Fig. 9 yes Figure 8 A magnified schematic diagram of the structure at D in the middle;

[0024] Fig.10 is a schematic diagram of a three-dimensional structure decomposition of a blocking mechanism of an embodiment;

[0025] Fig.11 It is a schematic diagram of the exploded three-dimensional structure of the receiving pipe and the sliding pipe of the embodiment;

[0026] Fig.12 It is a schematic diagram of the three-dimensional structure decomposition of the trigger mechanism of the embodiment.

[0027] The numbers in the figure are: 1, box girder body; 2, grouting port; 3, grouting pipeline; 4, one-way valve; 5, positioning column; 6, guiding inclined plane; 7, connecting ring groove; 8, supporting pipe seat; 9, connecting ring plate; 10, rotating ring plate; 11, limiting waist hole; 12, blocking block; 13, sliding block; 14, sliding column; 15, receiving pipe; 16, spiral slideway; 17, limiting slideway; 18, connecting pipe; 19, positioning slideway; 20, sliding pipe; 21 , limit column; 22, positioning block; 23, mounting ring; 24, limit box; 25, transfer tube; 26, limit sleeve; 27, limit ring; 28, limit slide; 29, trigger tube; 30, connecting short column; 31, locking ring; 32, inclined block; 33, limit spring; 34, limit slide; 35, locking rod; 36, inclined plate; 37, pressure spring; 38, positioning tube; 39, locking hole; 40, mounting short plate; 41, reset spring. DETAILED DESCRIPTION

[0028] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] refer to Figures 1 to 12 :

[0030] A box girder prefabricated prestressed channel grouting automatic feeding device comprises a box girder body 1, a plurality of grouting ports 2 arranged on the box girder body 1 and a grouting pipe 3 for injecting slurry into the grouting ports 2, and also comprises a one-way valve 4 arranged at the pipe mouth of the grouting pipe 3 and a connecting unit for connecting the grouting port 2 and the grouting pipe 3, the connecting unit comprises a connecting pipe 18 coaxially fixedly arranged on each grouting port 2, a plugging mechanism for closing or opening the grouting port 2 and a triggering mechanism for enabling the plugging mechanism to open the grouting port 2, the plugging mechanism and the triggering mechanism are both arranged in the connecting pipe 18, the triggering mechanism comprises a triggering pipe 29 coaxially elastically slidably arranged in the connecting pipe 18, the triggering pipe 29 is transmission-connected to the plugging mechanism, the valve core of the one-way valve 4 is transmission-connected to the triggering pipe 29, and the grouting pipe 3 is connected to the connecting pipe 18 by threads.

[0031] During the grouting work, grouting is injected into the grouting port 2 through the grouting pipe 3. A valve is arranged on the grouting pipe 3. The grouting pipe 3 is fixed to the connecting pipe 18 by a thread. During this process, the valve core of the one-way valve 4 on the grouting pipe 3 touches the trigger pipe 29, causing the trigger pipe 29 to move along the axis of the connecting pipe 18, and the trigger pipe 29 drives the blocking mechanism to operate after moving, so that the one-way valve 4 and the grouting port 2 are opened at the same time, and then grouting is started, and the pressure stabilization is completed after the grouting pipe 3 is removed. The one-way valve 4 blocks the grouting pipe 3 again, and the trigger pipe 29 and the valve core of the one-way valve 4 move away from each other. The trigger pipe 29 is reset and drives the blocking mechanism to block the grouting port 2 again. The prefabricated prestressed channel of the box girder body 1 is grouted by the above device, so that when the grouting pipe 3 is removed, the grouting port 2 is automatically closed, thereby ensuring the grouting quality, reducing the grouting working time, and improving the working efficiency.

[0032] In order to show the detailed structure of the blocking mechanism, the following features are also set:

[0033] The sealing mechanism includes a support pipe seat 8 coaxially fixed on the grouting port 2, a connecting ring plate 9 coaxially fixed on the support pipe seat 8, a rotating ring plate 10 rotatably arranged on the connecting ring plate 9, and a plurality of sealing blocks 12 annularly slidably arranged on the connecting ring plate 9, each sealing block 12 is transmission-connected to the rotating ring plate 10, and the rotating ring plate 10 is transmission-connected to the trigger tube 29.

[0034] After the trigger tube 29 is pushed by the valve core of the one-way valve 4, the rotating ring plate 10 is driven to rotate by the movement of the trigger tube 29. After the rotating ring plate 10 rotates, all the blocking blocks 12 move, thereby opening the grouting port 2, so that the grouting pipe 3 is connected to the inside of the grouting port 2.

[0035] In order to show the connection relationship between the rotating ring plate 10 and the blocking block 12, the following features are also specifically provided:

[0036] The connecting ring plate 9 is provided with a plurality of limiting slideways 17 (such as Fig.10 As shown in the figure, a plurality of limiting waist holes 11 are provided in a ring shape along the axis of the rotating ring plate 10, a sliding block 13 is provided on one side of each blocking block 12, a sliding column 14 is fixedly provided on the side of each blocking block 12 away from the sliding block 13, the sliding column 14 corresponds to the limiting waist holes 11 one by one and slides in cooperation, and the limiting slideway 17 corresponds to the sliding block 13 one by one and slides in cooperation.

[0037] When the rotating ring plate 10 rotates, the limiting waist hole 11 abuts against the sliding column 14 to drive the blocking block 12 to move along the limiting slideway 17, so that the blocking block 12 moves synchronously to open the grouting port 2.

[0038] In order to demonstrate that the movement of the trigger tube 29 can drive the rotating ring plate 10 to rotate, the following features are also specifically provided:

[0039] The trigger mechanism also includes a receiving tube 15 (such as Figure 8 As shown), a sliding tube 20 coaxially elastically slidably arranged in the connecting tube 18, a mounting ring 23 coaxially fixedly arranged on the sliding tube 20, a limit box 24 symmetrically fixedly arranged on the mounting ring 23, a transfer tube 25 fixedly arranged in the two limit boxes 24 and a limit sleeve 26 coaxially fixedly arranged on the transfer tube 25, the trigger tube 29 is coaxially elastically connected with the limit sleeve 26, a plurality of spiral slideways 16 are annularly provided on the outer wall of the receiving tube 15, and a plurality of limit columns 21 are annularly fixedly provided on the inner wall of the sliding tube 20, and the limit columns 21 correspond to the spiral slideways 16 one by one and slide in cooperation.

[0040] When the grouting pipe 3 is connected to the connecting pipe 18, the valve core of the one-way valve 4 first pushes the trigger tube 29 to move, so that the trigger tube 29 retracts into the limiting sleeve 26, and then the trigger tube 29 moves together with the limiting sleeve 26. At this time, the transfer tube 25, the limiting box 24, the mounting ring 23 and the sliding tube 20 move together. After the sliding tube 20 moves, the limiting column 21 contacts the spiral slide 16, causing the receiving tube 15 to rotate, and the rotation of the receiving tube 15 drives the rotating ring plate 10 to rotate.

[0041] In order to ensure that after the grouting pipe 3 is inserted into the connecting pipe 18, the valve core of the one-way valve 4 can accurately drive the trigger pipe 29 to move, the following features are also specifically provided:

[0042] A positioning column 5 is coaxially fixed on the valve core of the one-way valve 4, a guide slope 6 is provided at the port of the positioning column 5, a connecting ring groove 7 is opened on the inner wall of the positioning column 5, a connecting short column 30 is coaxially fixed on the trigger tube 29, a locking ring 31 is coaxially rotatably provided on the connecting short column 30, and the size of the locking ring 31 matches the size of the connecting ring groove 7.

[0043] When the device is running, the positioning column 5 contacts the connecting short column 30 through the guiding slope 6 to ensure that when the grouting pipe 3 is installed on the connecting pipe 18, the positioning column 5 can accurately cover the connecting short column 30. During this process, the locking ring 31 on the connecting short column 30 is inserted into the connecting ring groove 7. As the grouting pipe 3 continues to be twisted, the positioning column 5 continues to move. Then the positioning column 5 drives the trigger tube 29 to move along the axis of the limiting sleeve 26. The setting of the locking ring 31 and the connecting ring groove 7 makes it easy for the positioning column 5 to provide a certain traction force to the connecting short column 30 when the grouting pipe 3 is removed, thereby facilitating the resetting of the device.

[0044] In order to show the connection relationship between the sliding tube 20 and the connecting tube 18, the following features are also specifically provided:

[0045] Two positioning grooves 19 are symmetrically provided on the inner wall of the connecting tube 18, and two positioning blocks 22 are symmetrically provided on the sliding tube 20. The positioning blocks 22 correspond to the positioning grooves 19 one by one and slide in cooperation with each other. A mounting short plate 40 is fixedly provided at the end of each positioning groove 19, and a return spring 41 is provided on each mounting short plate 40. The two ends of the return spring 41 connect the positioning block 22 and the mounting short plate 40.

[0046] In order to ensure that the trigger tube 29 does not rotate relative to the limit sleeve 26 when sliding, the following features are also provided:

[0047] A limiting slide groove 28 is symmetrically provided on the inner wall of the limiting sleeve 26, and a limiting slide bar 34 is symmetrically provided on the outer wall of the trigger tube 29. The limiting slide bar 34 corresponds to the limiting slide groove 28 one by one and slides together. A limiting ring 27 is coaxially fixedly provided at the end of the limiting sleeve 26, and a limiting spring 33 is coaxially provided in the transfer tube 25. Both ends of the limiting spring 33 are connected to the trigger tube 29 and the transfer tube 25.

[0048] The setting of the limiting ring 27 ensures that when the trigger tube 29 is reset, the trigger tube 29 will not pop out from the limiting sleeve 26, and when the positioning column 5 pulls the connecting short column 30 to reset, the trigger tube 29 can pull the limiting sleeve 26 to move together.

[0049] In order to ensure that after the grouting is completed, the closed grouting port 2 will not be reopened after the grouting pipe 3 is pulled out, the following features are also specifically provided:

[0050] A locking hole 39 is provided on each positioning slot 19, and a locking rod 35 is slidably arranged in each limit box 24, and the locking rod 35 passes through the positioning block 22. A pressure spring 37 is coaxially sleeved on each locking rod 35, and one end of the pressure spring 37 is connected to the limit box 24, and the other end is connected to the locking rod 35. An inclined plate 36 is fixedly arranged on the ends of the two locking rods 35 that are close to each other, and an inclined block 32 is symmetrically fixed on the inner wall of the trigger tube 29. The size of the locking rod 35 matches the size of the locking hole 39. A positioning tube 38 is coaxially fixed on the sliding tube 20, and the outer wall of the positioning tube 38 is dynamically sealed with the inner wall of the grouting pipe 3, and the elastic force of the limit spring 33 is less than the elastic force of the reset spring 41.

[0051] It should be noted that the locking rod 35 is initially stuck in the locking hole 39 to ensure that the grouting port 2 can remain closed when the connecting pipe 18 is not connected to the grouting pipe 3. When the grouting pipe 3 is connected, the trigger tube 29 is first driven to retract into the limiting sleeve 26, and then the inclined block 32 abuts against the inclined plate 36, so that the two locking rods 35 approach each other, causing the locking rod 35 to be pulled out of the locking hole 39, and then the sliding tube 20 is unlocked and moves along the axis of the connecting pipe 18, thereby driving the receiving tube 15 to rotate and opening the grouting port 2.

[0052] The working principle of the device is as follows: during the grouting operation, grouting is injected into the grouting port 2 through the grouting pipe 3, a valve is provided on the grouting pipe 3, and the grouting pipe 3 is fixed to the connecting pipe 18 through a thread. During this process, the positioning column 5 contacts the connecting short column 30 through the guiding inclined surface 6 to ensure that when the grouting pipe 3 is installed on the connecting pipe 18, the positioning column 5 can accurately cover the connecting short column 30. During this process, the locking ring 31 on the connecting short column 30 is inserted into the connecting ring groove 7. As the grouting pipe 3 is continuously twisted, the positioning column 5 continues to move, and then the positioning column 5 drives the trigger tube 29 to move along the axis of the limiting sleeve 26, and then the inclined block 32 contacts the inclined plate 36, so that the two locking The rods 35 approach each other, causing the locking rod 35 to be pulled out of the locking hole 39, and then the trigger tube 29 moves together with the limiting sleeve 26. At this time, the transfer tube 25, the limiting box 24, the mounting ring 23 and the sliding tube 20 move together. When the sliding tube 20 moves, the limiting column 21 abuts against the spiral slide 16, causing the receiving tube 15 to rotate. The rotation of the receiving tube 15 drives the rotating ring plate 10 to rotate. The rotating ring plate 10 rotates, driving a plurality of sliding columns 14 to move outward along the length direction of the limiting waist hole 11, and then the sliding column 14 drives the movable block 12 to move along the limiting slide 17 through the sliding block 13, so that all the movable blocks 12 move synchronously, and finally open the grouting port 2, and then Grouting begins, and the slurry flows from the one-way valve 4 on the grouting pipe 3 into the positioning pipe 38, and then enters the grouting port 2 through the receiving pipe 15. After the grouting is completed, the grouting pipe 3 is reversely twisted to remove it from the connecting pipe 18. During this process, the positioning column 5 pulls the connecting short column 30, the reset spring 41 drives the sliding pipe 20 to reset, and the limit spring 33 drives the trigger tube 29 to reset. The sliding pipe 20 resets so that the limit column 21 hits the spiral slideway 16, causing the receiving pipe 15 to rotate in the opposite direction, driving the rotating ring plate 10 to rotate in the opposite direction, and the rotating ring plate 10 reverses to drive a plurality of sliding columns 14 to move inward along the length direction of the limit waist hole 11, and then the sliding column 14 brings the active The movable block 12 moves along the limiting slide 17 through the sliding block 13, so that all the movable blocks 12 move synchronously to close the grouting port 2, and because the trigger tube 29 is reset, the inclined block 32 and the inclined plate 36 no longer conflict with each other, and the locking rod 35 has a tendency to conflict with the positioning slide groove 19 again under the action of the pressure spring 37, until the sliding tube 20 is completely reset, and the locking rod 35 is inserted into the locking hole 39. At this time, the sliding tube 20 is locked, and the grouting pipe 3 continues to be twisted until the grouting pipe 3 is removed. After the sliding tube 20 is locked, the connecting ring groove 7 can no longer continue to clamp the locking ring 31, and then after the grouting pipe 3 is removed, the one-way valve 4 is also closed again to prevent the slurry from flowing out.

[0053] The above embodiments only express one or several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. An automatic grouting device for prefabricated prestressed channel of a box beam, comprising a box beam body (1), a plurality of grouting ports (2) arranged on the box beam body (1), and a grouting pipe (3) for injecting grout into the grouting ports (2), characterized in that: It also comprises a one-way valve (4) arranged at the pipe mouth of the grouting pipe (3) and a connection unit for connecting the grouting port (2) and the grouting pipe (3), the connection unit comprising a connection pipe (18) coaxially fixedly arranged on each grouting port (2), a blocking mechanism for closing or opening the grouting port (2), and a trigger mechanism for causing the blocking mechanism to open the grouting port (2), the blocking mechanism and the trigger mechanism both being arranged in the connection pipe (18), the trigger mechanism comprising a trigger pipe (29) coaxially elastically slidably arranged in the connection pipe (18), the trigger pipe (29) being transmission-connected to the blocking mechanism, the valve core of the one-way valve (4) being transmission-connected to the trigger pipe (29), and the grouting pipe (3) being threadedly connected to the connection pipe (18); The blocking mechanism comprises a support pipe seat (8) coaxially fixedly arranged on the grouting port (2), a connecting ring plate (9) coaxially fixedly arranged on the support pipe seat (8), a rotating ring plate (10) rotatably arranged on the connecting ring plate (9), and a plurality of blocking blocks (12) annularly slidably arranged on the connecting ring plate (9), each blocking block (12) is transmission-connected to the rotating ring plate (10), and the rotating ring plate (10) is transmission-connected to the trigger tube (29); A plurality of limiting slideways (17) are provided in a ring shape along the axis of the connecting ring plate (9); a plurality of limiting waist holes (11) are provided in a ring shape along the axis of the rotating ring plate (10); a sliding block (13) is provided on one side of each blocking block (12); a sliding column (14) is fixedly provided on the side of each blocking block (12) away from the sliding block (13); the sliding column (14) corresponds to the limiting waist hole (11) one by one and is slidably matched; and the limiting slideway (17) corresponds to the sliding block (13) one by one and is slidably matched; The trigger mechanism further comprises a receiving tube (15) coaxially fixedly arranged on the rotating ring plate (10), a sliding tube (20) coaxially elastically slidably arranged in the connecting tube (18), a mounting ring (23) coaxially fixedly arranged on the sliding tube (20), a limit box (24) symmetrically fixedly arranged on the mounting ring (23), a transfer tube (25) fixedly arranged in two limit boxes (24), and a limit sleeve (26) coaxially fixedly arranged on the transfer tube (25); the trigger tube (29) is coaxially elastically connected to the limit sleeve (26); a plurality of spiral slideways (16) are annularly provided on the outer wall of the receiving tube (15); a plurality of limit posts (21) are annularly fixedly provided on the inner wall of the sliding tube (20); the limit posts (21) correspond to the spiral slideways (16) one by one and are slidably matched.

2. The automatic grouting device for prefabricated prestressed channel of box beam according to claim 1 is characterized in that: A positioning column (5) is coaxially fixedly arranged on the valve core of the one-way valve (4), a guide inclined surface (6) is arranged at the end of the positioning column (5), a connecting ring groove (7) is opened on the inner wall of the positioning column (5), a connecting short column (30) is coaxially fixedly arranged on the trigger tube (29), a locking ring (31) is coaxially rotatably arranged on the connecting short column (30), and the size of the locking ring (31) matches the size of the connecting ring groove (7).

3. The automatic grouting device for prefabricated prestressed channel of box beam according to claim 2 is characterized in that: Two positioning grooves (19) are symmetrically provided on the inner wall of the connecting tube (18), and two positioning blocks (22) are symmetrically provided on the sliding tube (20). The positioning blocks (22) correspond to the positioning grooves (19) one by one and are slidably matched. A mounting short plate (40) is fixedly provided at the end of each positioning groove (19), and a return spring (41) is provided on each mounting short plate (40). The two ends of the return spring (41) connect the positioning block (22) and the mounting short plate (40).

4. The automatic grouting device for prefabricated prestressed channel of box beam according to claim 3 is characterized in that: A limit slide groove (28) is symmetrically provided on the inner wall of the limit sleeve (26), and a limit slide bar (34) is symmetrically provided on the outer wall of the trigger tube (29). The limit slide bar (34) corresponds to the limit slide groove (28) one by one and is slidably matched. A limit ring (27) is coaxially fixedly provided at the end of the limit sleeve (26), and a limit spring (33) is coaxially provided in the transfer tube (25). The two ends of the limit spring (33) are connected to the trigger tube (29) and the transfer tube (25).

5. The automatic grouting device for prefabricated prestressed channel of box beam according to claim 4 is characterized in that: A locking hole (39) is provided on each positioning slide groove (19), a locking rod (35) is slidably arranged in each limit box (24), the locking rod (35) passes through the positioning block (22), a pressure spring (37) is coaxially sleeved on each locking rod (35), one end of the pressure spring (37) is connected to the limit box (24), and the other end is connected to the locking rod (35), and an inclined plate (36) is fixedly arranged on the ends of the two locking rods (35) that are close to each other, an inclined block (32) is symmetrically fixedly arranged on the inner wall of the trigger tube (29), the size of the locking rod (35) matches the size of the locking hole (39), a positioning tube (38) is coaxially fixedly arranged on the sliding tube (20), the outer wall of the positioning tube (38) is dynamically sealed with the inner wall of the grouting pipe (3), and the elastic force of the limit spring (33) is smaller than the elastic force of the return spring (41).

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