Continuous beam prestressed pipeline exhaust device

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By using bellows and stainless steel threaded exhaust pipes in prestressed pipes combined with a self-locking protective mechanism, the problem of easy blockage of the exhaust holes was solved, the density and stability of the grouting were achieved, and the construction quality and durability of the bridge were improved.

CN223375405UActive Publication Date: 2025-09-23EAST CHINA JIAOTONG UNIVERSITY

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Patent Information

Application Number: CN202421910975.3
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-08-08
Publication Date: 2025-09-23
Estimated Expiration: 2034-08-08

AI Technical Summary

Technical Problem

In traditional prestressed pipe exhaust devices, the exhaust holes are easily clogged and have poor sealing, resulting in incomplete grouting, affecting the quality and durability of bridge construction.

Method used

The bellows and stainless steel threaded exhaust pipe are combined with a self-locking protection mechanism. The design of the plug hole and expansion tube ensures that the exhaust pipe and the bellows are stably connected to prevent rotation, thereby improving sealing and stability.

Benefits of technology

Effectively prevent the blockage of exhaust holes, ensure the density of grouting, reduce the risk of rust, and improve the quality of bridge construction and service life.

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Abstract

The utility model provides a continuous beam prestressed pipeline exhaust device which comprises a plurality of corrugated pipes which are arranged in a reinforcement cage. Compared with the prior art, the stainless steel threaded exhaust pipe has the advantages that through the design of the self-locking protection mechanism, in the process that the stainless steel threaded exhaust pipe is screwed into the expansion pipe, the protection cover can be linearly close to the expansion pipe, the end of the expansion pipe is covered and protected by the protection cover, and the insertion rods on the two sides of the protection cover can be inserted into the movable cavity through the second inlet and outlet; butt-joint blocks on the two sides of the interior of a protective cover can be inserted into butt-joint grooves, the butt-joint blocks can extrude protruding blocks, the protruding blocks can enter movable cavities through first inlets and outlets, inclined faces of the side edges of sliding blocks are extruded through sliding plates, the sliding blocks are extruded to drive limiting blocks to transversely move, and the limiting blocks transversely move to be inserted into limiting grooves in the side edges of inserting rods; the joint of the stainless steel threaded exhaust pipe and the expansion pipe is shielded, and meanwhile self-locking protection can be achieved.

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Description

Technical Field

[0001] The utility model relates to a continuous beam prestressed pipeline exhaust device, belonging to the field of bridge engineering. Background Art

[0002] In prestressed concrete bridge construction, ensuring the density of pipe grouting is crucial for the durability and bearing capacity of the structure. However, traditional methods, such as installing vent holes at the crest or highest point of the vertical pipe, suffer from incomplete grouting. This, coupled with the poor sealing, insecure fixation, and insufficient strength of the plastic corrugated pipe, can easily lead to vent hole blockage. Furthermore, the tape method used to secure the plastic pipe can easily fail during concrete pouring, resulting in poor sealing and allowing cement slurry to flow into the pipe, causing blockage.

[0003] Inserting plastic pipes also takes up space in the pipes, making it more difficult to thread the steel strands. During the tensioning process, the pipes can become compressed and clog the vent holes. Furthermore, the plastic pipes lack strength and are prone to damage during grouting. These issues ultimately lead to incomplete grouting, exposing the steel strands to air and increasing the risk of corrosion, which in turn affects the durability of the prestressed tendons and the overall quality of the bridge. Therefore, improving the venting methods of prestressed pipes and increasing the density of the grouting are crucial for ensuring the quality of bridge construction and extending its service life. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model aims to provide a continuous beam prestressed pipe exhaust device.

[0005] In order to achieve the above purpose, the present invention is implemented through the following technical solutions:

[0006] A continuous beam prestressed pipe exhaust device comprises a plurality of corrugated pipes, wherein the plurality of corrugated pipes are arranged inside a steel cage, a plug-in hole 1 is provided at the crest position of the corrugated pipe, an arc-shaped steel sheet is installed at the crest position of the corrugated pipe through a locking hoop, a plug-in hole 2 is provided on the arc-shaped steel sheet which matches the plug-in hole 1, the end of the expansion pipe passes through the plug-in hole 2 and the plug-in hole 1 to penetrate into the interior of the corrugated pipe, a stainless steel threaded exhaust pipe is plugged into the inner thread of the expansion pipe, a self-locking protective mechanism which matches the outer surface of the expansion pipe is provided on the stainless steel threaded exhaust pipe, the end of the stainless steel threaded exhaust pipe is connected to the expansion pipe at one end inside the corrugated pipe to unfold the wings of the expansion pipe, and the wings are squeezed together with the inner wall of the corrugated pipe.

[0007] Furthermore, the expansion tube is an aircraft-type expansion tube, and the expansion tube is made of plastic material.

[0008] Furthermore, the self-locking protective mechanism includes a protective cover rotatably connected to the stainless steel threaded exhaust pipe, two docking blocks are symmetrically fixed inside the protective cover, and an insertion rod is fixed on both sides of the outer surface of the protective cover. The two insertion rods correspond to the two docking blocks, and a limiting groove is provided on the side of the insertion rod close to the protective cover.

[0009] Furthermore, the self-locking protection mechanism also includes docking grooves on both sides of the outer surface of the expansion tube and movable chambers on both sides of the interior of the expansion tube, inlet and outlet 1 and inlet and outlet 2 are respectively provided on both sides of the top of the movable chamber, inlet and outlet 1 is communicated with the bottom of the docking groove, a sliding block is slidably connected in the movable chamber, and limit blocks and inclined surfaces are respectively provided on both sides of the sliding block, a protrusion is slidably connected in inlet and outlet 1, the bottom end of the protrusion passes through the interior of the movable chamber and is connected and fixed to the sliding plate, the sliding plate is slidably connected in the movable chamber, and the bottom of the sliding plate is squeezed together with the inclined surface.

[0010] Furthermore, side plates are fixed on both sides of the sliding block, and sliding grooves that match the side plates are opened on the inner walls of both sides of the movable cavity, and springs that match the side plates are arranged in the sliding grooves.

[0011] Furthermore, the protective cover covers the outside of the expansion tube, the insertion rod is inserted into the movable cavity through the inlet and outlet, the limit groove and the limit block are located in the same plane, the docking block is inserted into the docking groove and squeezes the protrusion, the protrusion penetrates into the movable cavity and drives the sliding plate to squeeze the inclined surface, and the movement of the sliding block drives the limit block to be clamped in the limit groove.

[0012] Furthermore, a groove is provided inside the movable cavity, the groove corresponds to the second inlet and outlet, and an elastic extrusion block is provided in the limiting groove.

[0013] Furthermore, the expansion tube is provided with two top positioning blocks at the bottom of one end of the outer side of the arc-shaped steel sheet, the outer surface of the arc-shaped steel sheet is provided with a top positioning groove that cooperates with the top positioning block, the outer surface of the wing is provided with several bottom positioning blocks, and the inner wall of the corrugated tube is provided with a bottom positioning groove that cooperates with the bottom positioning block.

[0014] Beneficial effects of the utility model:

[0015] Through the design of the self-locking protection mechanism, during the process of the stainless steel threaded exhaust pipe being screwed into the expansion pipe, since the stainless steel threaded exhaust pipe and the expansion pipe are movably connected, the rotation of the stainless steel threaded exhaust pipe will not drive the protective cover to rotate. In this way, during the process of the stainless steel threaded exhaust pipe being screwed into the expansion pipe, the protective cover can approach the expansion pipe in a straight line, and the protective cover covers and protects the end of the expansion pipe. The insertion rods on both sides of the protective cover will be inserted into the movable cavity through the second inlet and outlet, and the docking blocks on both sides of the inside of the protective cover will be inserted into the docking grooves. The docking blocks will squeeze the protrusions, and the protrusions will enter the movable cavity through the first inlet and outlet, and squeeze the inclined surface of the side of the sliding block through the sliding plate. The sliding block will be squeezed to drive the limit block to move laterally, and the limit block will be inserted into the limit groove on the side of the insertion rod.

[0016] Through the design of the elastic extrusion block, the vertical insertion action of the insertion rod and the horizontal insertion action of the limit block are carried out synchronously. Therefore, an elastic extrusion block is set inside the limit slot. When the insertion rod is inserted into the limit slot, the elastic extrusion block will be squeezed. As a result, when the insertion rod is inserted into the limit slot, the gap between the insertion rod and the limit slot will be filled by the deformed elastic extrusion block, making the connection between the two compatible.

[0017] Through the design of the top positioning block and the top positioning groove as well as the bottom positioning block and the top positioning groove, when the aircraft-type expansion tube is pressed against the bellows, the end of the expansion tube on the bellows is tightly attached to the bellows, and the wing of the expansion tube is tightly attached to the inside of the bellows. At this time, the top positioning block on the outside of the expansion tube is docked with the top positioning groove on the outer surface of the bellows, and the bottom positioning block on the wing is docked with the bottom positioning groove on the inner wall of the bellows, thereby improving the stability between the expansion tube, the bellows and the curved steel sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the overall structure of a prestressed pipe exhaust device for a continuous beam according to the present utility model;

[0020] Figure 2 This is a schematic diagram of the connection structure of the stainless steel threaded exhaust pipe, expansion pipe and self-locking protection mechanism of a continuous beam prestressed pipe exhaust device of the utility model Figure 1 ;

[0021] Figure 3This is a schematic diagram of the connection structure of the stainless steel threaded exhaust pipe, expansion pipe and self-locking protection mechanism of a continuous beam prestressed pipe exhaust device of the utility model. Figure 2 ;

[0022] Figure 4 This is a schematic diagram of the expansion tube structure of a continuous beam prestressed pipeline exhaust device of the utility model;

[0023] Figure 5 This is a schematic diagram of the partial structure of the self-locking protection mechanism of the prestressed pipe exhaust device of a continuous beam in this utility model. Figure 1 ;

[0024] Figure 6 This is a schematic diagram of the partial structure of the self-locking protection mechanism of the prestressed pipe exhaust device of a continuous beam in this utility model. Figure 2 ;

[0025] Figure 7 This is a schematic diagram of the partial structure of the expansion pipe of a continuous beam prestressed pipeline exhaust device of the utility model;

[0026] Figure 8 This is a schematic diagram of the partial structure of the self-locking protection mechanism of the prestressed pipe exhaust device of a continuous beam in this utility model. Figure 3 .

[0027] In the figure, 1. bellows; 2. stainless steel threaded exhaust pipe; 3. curved steel sheet; 4. expansion tube; 5. locking hoop; 6. steel cage; 7. wings; 8. bottom positioning block; 9. protective cover; 10. docking block; 11. plug rod; 12. limit groove; 13. docking groove; 14. movable cavity; 15. inlet and outlet 1; 16. inlet and outlet 2; 17. sliding block; 18. side plate; 19. spring; 20. limit block; 21. inclined plane; 22. sliding plate; 23. protrusion; 24. groove. DETAILED DESCRIPTION

[0028] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0029] See also Figures 1-8The utility model provides a technical solution for a continuous beam prestressed pipeline exhaust device, comprising a plurality of corrugated pipes 1, wherein the plurality of corrugated pipes 1 are arranged inside a steel cage 6, a plug hole 1 is provided at the wave crest position of the corrugated pipe 1, an arc-shaped steel sheet 3 is installed at the wave crest position of the corrugated pipe 1 through a locking hoop 5, a plug hole 2 is provided on the arc-shaped steel sheet 3 to match the plug hole 1, the end of the expansion pipe 4 passes through the plug hole 2 and the plug hole 1 to the interior of the corrugated pipe 1, a stainless steel threaded exhaust pipe 2 is inserted into the internal thread of the expansion pipe 4, and a self-locking protective mechanism is provided on the stainless steel threaded exhaust pipe 2 to match the outer surface of the expansion pipe 4. The end of the stainless steel threaded exhaust pipe 2 is connected to the expansion tube 4 at one end inside the bellows 1 to unfold the wings 7 of the expansion tube 4. The wings 7 are squeezed together with the inner wall of the bellows 1. The expansion tube 4 is an aircraft-type expansion tube. The expansion tube 4 is made of plastic material. The inner diameter of the upper half of the expansion tube 4 is 0.8 cm and the outer diameter is 1.2 cm. The inner diameter of the lower half of the expansion tube 4 is 0.8 cm and the outer diameter is 1 cm. The inner diameter of the stainless steel threaded exhaust pipe 2 is 0.6 cm and the outer diameter is 0.8 cm. The arc-shaped steel sheet 3 is 10 cm long and 1 cm thick. The diameters of the plug hole 1 and the plug hole 2 are both 1 cm.

[0030] See Figure 2-Figure 8The self-locking protective mechanism includes a protective cover 9 rotatably connected to the stainless steel threaded exhaust pipe 2, two docking blocks 10 are symmetrically fixed inside the protective cover 9, and a plug rod 11 is fixed on both sides of the outer surface of the protective cover 9. The two plug rods 11 correspond to the two docking blocks 10. The plug rod 11 is close to the protective cover 9 and has a limiting groove 12. The self-locking protective mechanism also includes docking grooves 13 on both sides of the outer surface of the expansion tube 4 and active chambers 14 on both sides of the interior of the expansion tube 4. The top of the active chamber 14 is respectively provided with an inlet and outlet 15 and an inlet and outlet 2 16. The inlet and outlet 15 is connected to the bottom of the docking groove 13, and a sliding block 17 is slidably connected in the active cavity 14. A limit block 20 and an inclined surface 21 are respectively provided on both sides of the sliding block 17. A protrusion 23 is slidably connected in the inlet and outlet 15. The bottom end of the protrusion 23 passes through the interior of the active cavity 14 and is connected and fixed to the sliding plate 22. The sliding plate 22 is slidably connected to the interior of the active cavity 14. The bottom of the sliding plate 22 is squeezed together with the inclined surface 21. The protective cover 9 covers the outside of the expansion tube 4. The insertion rod 11 is inserted into the active cavity 14 through the inlet and outlet 2 16. The limiting groove 12 and the limiting block 20 are located in the same plane, the docking block 10 is inserted into the docking groove 13 and squeezes the protrusion 23, the protrusion 23 penetrates into the active cavity 14 and drives the sliding plate 22 to squeeze the inclined surface 21, and the sliding block 17 moves to drive the limiting block 20 to be clamped in the limiting groove 12; through the design of the self-locking protective mechanism, in the process of the stainless steel threaded exhaust pipe 2 being screwed into the expansion pipe 4, because the stainless steel threaded exhaust pipe 2 and the expansion pipe 4 are movably connected, the rotation of the stainless steel threaded exhaust pipe 2 will not drive the protective cover 9 to rotate, so that in the process of the stainless steel threaded exhaust pipe During the process of screwing the expansion tube 4, the protective cover 9 can move linearly toward the expansion tube 4, covering and protecting the end of the expansion tube 4. The insertion rods 11 on both sides of the protective cover 9 are inserted into the movable cavity 14 through the second inlet and outlet 16. The docking blocks 10 on both sides of the interior of the protective cover 9 are inserted into the docking grooves 13. The docking blocks 10 squeeze the protrusions 23, which enter the movable cavity 14 through the first inlet and outlet 15 and squeeze the inclined surface 21 on the side of the sliding block 17 through the sliding plate 22. The sliding block 17 is squeezed, which drives the limit block 20 to move laterally. The limit block 20 moves laterally and is inserted into the limit groove 12 on the side of the insertion rod 11.

[0031] See Figure 8, side plates 18 are fixed on both sides of the sliding block 17, and sliding grooves that cooperate with the side plates 18 are opened on the inner walls of both sides of the active cavity 14, and springs 19 that cooperate with the side plates 18 are provided in the sliding grooves; through the setting of the side plates 18 and the sliding grooves, the stability of the movement of the sliding block 17 is improved, and through the setting of the spring 19, when the docking block 10 does not squeeze the protrusion 23, the sliding block 17 can be reset and moved under the action of the spring 19.

[0032] See Figure 4 and Figure 8 A groove 24 is provided inside the movable cavity 14, and the groove 24 corresponds to the inlet and outlet 16. An elastic extrusion block is provided in the limit groove 12; through the design of the elastic extrusion block, the vertical insertion action of the insertion rod 11 and the horizontal insertion action of the limit block 20 are performed synchronously. Therefore, an elastic extrusion block is provided inside the limit groove 12, and the insertion rod 11 will squeeze the elastic extrusion block when it is inserted into the limit groove 12, so that when the insertion rod 11 is inserted into the limit groove 12, the gap between the insertion rod 11 and the limit groove 12 will be filled by the deformed elastic extrusion block, so that the connection between the two is adapted.

[0033] See Figure 2-Figure 4 The expansion tube 4 is provided with two top positioning blocks at the bottom of one end of the outer side of the arc-shaped steel sheet 3, and the outer surface of the arc-shaped steel sheet 3 is provided with a top positioning groove that matches the top positioning block, and the outer surface of the wing 7 is provided with several bottom positioning blocks 8, and the inner wall of the bellows 1 is provided with a bottom positioning groove that matches the bottom positioning block 8; through the design of the top positioning block and the top positioning groove and the bottom positioning block 8 and the top positioning groove, when the aircraft-type expansion tube is pressed on the bellows 1, the end of the expansion tube 4 on the bellows 1 is tightly attached to the bellows 1, and the wing 7 of the expansion tube 4 is tightly attached to the inside of the bellows 1. At this time, the top positioning block outside the expansion tube 4 is docked with the top positioning groove on the outer surface of the bellows 1, and the bottom positioning block 8 on the wing 7 is docked with the bottom positioning groove on the inner wall of the bellows 1, thereby improving the stability between the expansion tube 4, the bellows 1 and the arc-shaped steel sheet 3.

[0034] When in use, use a hole-opening tool to open the plug hole 1 and the plug hole 2 on the crest of the bellows 1 and the curved steel sheet 3 respectively, then, use the locking hoop 5 to fix the curved steel sheet 3 on the bellows 1, and make the plug hole 1 and the plug hole 2 butt together, then, insert the expanded end of the expansion tube 4 into the plug hole 1 and the plug hole 2 into the bellows 1, during the insertion process, the top positioning block on the outside of the expansion tube 4 is butted against the top positioning groove on the outer surface of the bellows 1 for positioning, then, screw the stainless steel threaded exhaust pipe 2 into the expansion tube 4, and the stainless steel threaded exhaust pipe 2 will gradually drive the wings 7 of the expansion tube 4 to open during the screwing process, and the wings 7 will be close to the inner wall of the bellows 1, and the bottom positioning block 8 on the wings 7 will be butted against the bottom positioning groove on the inner wall of the bellows 1, and the stability between the expansion tube 4, the bellows 1 and the curved steel sheet 3 will be improved by the top positioning block and the top positioning groove, as well as the bottom positioning block 8 and the bottom positioning groove.

[0035] In the process of screwing the stainless steel threaded exhaust pipe 2 into the expansion pipe 4, the stainless steel threaded exhaust pipe 2 is movably connected to the expansion pipe 4, so the rotation of the stainless steel threaded exhaust pipe 2 will not drive the protective cover 9 to rotate. In this way, in the process of screwing the stainless steel threaded exhaust pipe 2 into the expansion pipe 4, the protective cover 9 can move straightly toward the expansion pipe 4, and the protective cover 9 covers and protects the end of the expansion pipe 4. The insertion rods 11 on both sides of the protective cover 9 will be inserted into the movable cavity 14 through the second inlet and outlet 16, and the docking blocks 10 on both sides of the interior of the protective cover 9 will be inserted into the docking grooves 13. The docking blocks 10 will squeeze the protrusions 23, and the protrusions 23 will enter the movable cavity 14 through the first inlet and outlet 15, and squeeze the inclined surface 21 on the side of the sliding block 17 through the sliding plate 22. The sliding block 17 is squeezed to drive the limit block 20 to move horizontally, and the limit block 20 moves horizontally to be inserted into the limit groove 12 on the side of the insertion rod 11;

[0036] The vertical insertion action of the insertion rod 11 is carried out synchronously with the horizontal insertion action of the limit block 20. Therefore, an elastic extrusion block is set inside the limit groove 12. When the insertion rod 11 is inserted into the limit groove 12, the elastic extrusion block will be squeezed. As a result, when the insertion rod 11 is inserted into the limit groove 12, the gap between the insertion rod 11 and the limit groove 12 will be filled by the deformed elastic extrusion block, making the connection between the two compatible.

[0037] Although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A continuous beam prestressed pipe exhaust device, characterized in that: The invention comprises a plurality of bellows (1), wherein the plurality of bellows (1) are arranged inside a steel cage (6), a plug hole 1 is provided at the crest position of the bellows (1), an arc-shaped steel sheet (3) is installed at the crest position of the bellows (1) through a locking hoop (5), a plug hole 2 is provided on the arc-shaped steel sheet (3) and matches the plug hole 1, the end of the expansion tube (4) passes through the plug hole 2 and the plug hole 1 to the inside of the bellows (1), a stainless steel threaded exhaust pipe (2) is plugged into the internal thread of the expansion tube (4), a self-locking protective mechanism matching the outer surface of the expansion tube (4) is provided on the stainless steel threaded exhaust pipe (2), the end of the stainless steel threaded exhaust pipe (2) is connected to one end of the expansion tube (4) inside the bellows (1) to unfold the wings (7) of the expansion tube (4), and the wings (7) are squeezed together with the inner wall of the bellows (1).

2. The exhaust device for prestressed pipes of continuous beams according to claim 1, characterized in that: The expansion tube (4) is an aircraft-type expansion tube, and the expansion tube (4) is made of plastic material.

3. The exhaust device for prestressed pipes of continuous beams according to claim 2, characterized in that: The self-locking protective mechanism comprises a protective cover (9) rotatably connected to the stainless steel threaded exhaust pipe (2), two docking blocks (10) are symmetrically fixed inside the protective cover (9), and a plug rod (11) is fixed on both sides of the outer surface of the protective cover (9), the two plug rods (11) correspond to the two docking blocks (10), and a limiting groove (12) is provided on the side of the plug rod (11) close to the protective cover (9).

4. The exhaust device for prestressed pipes of continuous beams according to claim 3, characterized in that: The self-locking protection mechanism also includes a docking groove (13) provided on both sides of the outer surface of the expansion tube (4) and a movable cavity (14) provided on both sides of the interior of the expansion tube (4). An inlet and outlet 1 (15) and an inlet and outlet 2 (16) are provided on both sides of the top of the movable cavity (14). The inlet and outlet 1 (15) is communicated with the bottom of the docking groove (13). A sliding block (17) is slidably connected in the movable cavity (14). A limit block (20) and an inclined surface (21) are provided on both sides of the sliding block (17). A protrusion (23) is slidably connected in the inlet and outlet 1 (15). The bottom end of the protrusion (23) passes through the interior of the movable cavity (14) and is connected and fixed to a sliding plate (22). The sliding plate (22) is slidably connected in the interior of the movable cavity (14). The bottom of the sliding plate (22) is squeezed together with the inclined surface (21).

5. The exhaust device for prestressed pipes of continuous beams according to claim 4, characterized in that: Side plates (18) are fixed on both sides of the sliding block (17), and sliding grooves matching the side plates (18) are provided on the inner walls of both sides of the movable cavity (14), and springs (19) matching the side plates (18) are provided in the sliding grooves.

6. The exhaust device for prestressed pipes of a continuous beam according to claim 5, characterized in that: The protective cover (9) covers the outside of the expansion tube (4), the insertion rod (11) is inserted into the movable cavity (14) through the second inlet and outlet (16), the limiting groove (12) and the limiting block (20) are located in the same plane, the docking block (10) is inserted into the docking groove (13) and squeezes the protrusion (23), the protrusion (23) penetrates into the movable cavity (14) and drives the sliding plate (22) to squeeze the inclined surface (21), and the sliding block (17) moves to drive the limiting block (20) to be clamped in the limiting groove (12).

7. The exhaust device for prestressed pipes of continuous beams according to claim 6, characterized in that: A groove (24) is provided inside the movable cavity (14), and the groove (24) corresponds to the second inlet and outlet (16). An elastic extrusion block is provided in the limiting groove (12).

8. The exhaust device for prestressed pipes of continuous beams according to claim 1, characterized in that: The expansion tube (4) is provided with two top positioning blocks at the bottom of one end outside the arc-shaped steel sheet (3), the outer surface of the arc-shaped steel sheet (3) is provided with a top positioning groove that matches the top positioning block, the outer surface of the wing (7) is provided with a plurality of bottom positioning blocks (8), and the inner wall of the corrugated tube (1) is provided with a bottom positioning groove that matches the bottom positioning block (8).