Prestressed pipe overflow control device
By introducing overflow sensors and magnetic grout stop valve systems into the prestressed ducts, the problem of lag in manually judging the fullness of grouting during the grouting process was solved, realizing automatic monitoring and control, and improving construction efficiency and grouting quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA RAILWAY 11TH BUREAU GRP CORP LTD
- Filing Date
- 2025-07-04
- Publication Date
- 2026-06-23
AI Technical Summary
In the existing technology, the judgment of grout fullness during the prestressed duct grouting process relies on manual observation, which is subjective and lagging, and it is difficult to accurately control the opening and closing of the grout stop valve, resulting in incomplete or excessive grouting, which affects the structural quality.
A prestressed duct overflow control device is adopted, which includes an overflow sensor, a grout stop valve and a magnetic core system. The overflow sensor detects the grout overflow signal and automatically controls the opening and closing of the grout stop valve to realize automatic monitoring and grout stop of grouting fullness.
It achieves automatic monitoring of grout fullness and automatic grout stopping, reducing manual intervention, improving construction efficiency, and ensuring grout quality.
Smart Images
Figure CN224397273U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of prestressed pipe grouting technology, specifically a prestressed pipe overflow control device. Background Technology
[0002] Prestressed ducts are tubular structures used in prestressed concrete structures to provide channels for prestressed tendons (such as steel strands), preventing the prestressed tendons from being contaminated, corroded, or mechanically damaged during concrete pouring, and ensuring their stable mechanical properties.
[0003] In the construction of prestressed concrete structures, grouting of prestressed ducts is a key process to ensure effective bonding between prestressed tendons and concrete and to prevent corrosion of prestressed tendons. Currently, the judgment of grout fullness mainly relies on manual observation of the overflow hole, which is subjective and has a lag, and is prone to incomplete grouting or over-grouting, affecting the structural quality. Moreover, it is difficult to accurately grasp the timing of manually operating the grout stop valve to close the overflow hole, which may result in excessive grout overflow and waste or premature closure, leading to voids in the duct. Therefore, a prestressed duct overflow control device is needed. Utility Model Content
[0004] The purpose of this invention is to provide a prestressed duct overflow control device to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a prestressed duct overflow control device, comprising a prestressed duct body, a grouting hole, an overflow hole, and an exhaust duct. The prestressed duct body has a grouting hole at its bottom end and an overflow hole at its top. An overflow sensor is installed inside the overflow hole, and a stop valve is installed at its top. The bottom end of the stop valve is connected to the overflow hole via an air inlet, and an exhaust duct is installed at its top. A connecting port is provided between the exhaust duct and the air inlet, and a valve seat is provided on the outside of the connecting port. A valve core is provided on one side of the valve seat. A chamber is provided on one side of the stop valve, and a spring column is installed inside the chamber via an iron core. One end of the spring column is connected to the valve core, and a coil is provided on the outside of the iron core.
[0006] Preferably, guide blocks are provided on both sides of the valve core near the iron core end, and guide grooves matching the guide blocks are provided on both sides of the cavity.
[0007] Preferably, the valve core is provided with locking blocks at both ends on the side near the valve seat, and the valve seat is provided with locking grooves at both ends on the side near the valve core that match the locking blocks.
[0008] Preferably, the ends of the card blocks are all rounded transition structures, and the entrances of the card slots are all chamfered.
[0009] Preferably, the inner wall of the overflow hole is provided with a sealing groove, and a first sealing ring is provided on the side of the sealing groove near the air inlet, and a second sealing ring is provided on the side of the sealing groove away from the air inlet.
[0010] Preferably, a third sealing ring is provided between the second sealing ring and the first sealing ring, and the two ends inside the sealing groove are respectively connected to the third sealing ring by a return spring.
[0011] Preferably, the cross-section of the third sealing ring is trapezoidal, and the two ends of the third sealing ring are respectively in close contact with the inclined surfaces of the first sealing ring and the second sealing ring.
[0012] Preferably, the overflow sensor is fixed to the outer wall of the prestressed pipe body by bolts, and the detection end of the overflow sensor is directly embedded in the inner cavity of the overflow hole.
[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This prestressed duct overflow control device is equipped with a prestressed duct body, overflow hole, air inlet, overflow sensor, grout stop valve, coil, iron core, spring column, valve core, valve seat, connecting port, and exhaust channel. Grout is injected through the grouting hole at the bottom of the prestressed duct body, filling from bottom to top, allowing air to be discharged upwards through the overflow hole. The overflow sensor is set in the overflow hole of the prestressed duct body to detect whether there is grout overflow. The overflow sensor is a contact sensor. When the grout comes into contact with the sensor sensing surface, it converts the physical signal into an electrical signal and transmits it to the grouting control system. Then, it controls the coil in the grout stop valve to be de-energized, and the energization causes the iron core to lose its attraction to the valve core. Under the action of the spring column, the valve core connects to the valve seat, thereby sealing the connecting port and achieving the purpose of stopping the grout. This realizes automatic monitoring of grout fullness and automatic grout stop, reduces manual intervention, and improves construction efficiency. Attached Figure Description
[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0015] Figure 1 This is a frontal cross-sectional view of the present invention.
[0016] Figure 2 This is a schematic diagram of the cross-sectional structure of the slurry stop valve of this utility model;
[0017] Figure 3For the present utility model Figure 2 Enlarged structural diagram at point B;
[0018] Figure 4 For the present utility model Figure 2 Enlarged structural diagram at point C;
[0019] Figure 5 For the present utility model Figure 1 Enlarged structural diagram at point A in the middle.
[0020] In the diagram: 1. Main body of prestressed duct; 2. Grouting hole; 3. Grout overflow sensor; 4. Grout overflow hole; 5. Air inlet; 6. Grout stop valve; 7. Sealing groove; 8. Locking block; 9. Exhaust duct; 10. Coil; 11. Iron core; 12. Spring column; 13. Valve core; 14. Guide block; 15. Chamber; 16. Connecting port; 17. Valve seat; 18. Locking groove; 19. Return spring; 20. First sealing ring; 21. Second sealing ring; 22. Third sealing ring. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0022] Please see Figures 1-5 An embodiment of this utility model is provided: a prestressed duct overflow control device, including a prestressed duct body 1, a grouting hole 2, an overflow hole 4 and an exhaust channel 9. The bottom end of the prestressed duct body 1 is provided with a grouting hole 2, and the top end of the prestressed duct body 1 is provided with an overflow hole 4.
[0023] Construction workers start the grouting equipment, and the grout is injected from the grouting hole 2 at the bottom of the prestressed pipe body 1. Under pressure, the grout fills the prestressed pipe body 1 from bottom to top, and the air in the pipe is discharged upward through the overflow hole 4.
[0024] An overflow sensor 3 is installed inside the overflow hole 4. The overflow sensor 3 is fixed to the outer wall of the prestressed pipe body 1 by bolts, and the detection end of the overflow sensor 3 is directly embedded in the inner cavity of the overflow hole 4.
[0025] A stop valve 6 is provided at the top of the overflow hole 4. The bottom of the inside of the stop valve 6 is connected to the overflow hole 4 through the air inlet 5, and an exhaust duct 9 is provided at the top of the inside of the stop valve 6.
[0026] When the grout is filled and overflows from the overflow hole 4, it comes into contact with the sensing surface of the overflow sensor 3 inside the overflow hole 4. As a contact sensor, the overflow sensor 3 converts the physical contact signal into an electrical signal. The electrical signal is transmitted to the grouting control system, which determines that the grouting is full. The control system then sends a power-off control signal to the grout stop valve 6.
[0027] A connecting port 16 is provided between the exhaust port 9 and the intake port 5, and a valve seat 17 is provided on the outside of the connecting port 16, and a valve core 13 is provided on one side of the valve seat 17.
[0028] A chamber 15 is provided on one side inside the slurry stop valve 6, and a spring column 12 is provided inside the chamber 15 through an iron core 11, and one end of the spring column 12 is connected to the valve core 13. A coil 10 is provided on the outside of the iron core 11.
[0029] Before receiving the control signal, the coil 10 inside the stop valve 6 is energized, generating a magnetic field that attracts the iron core 11. The iron core 11 pulls the valve core 13 open through the spring column 12, so that the connecting port 16 is in the open state, and the air intake duct 5 is connected to the exhaust duct 9.
[0030] When the grout stop signal is received, the coil 10 is de-energized, the magnetic field disappears, the iron core 11 loses its attraction to the valve core 13, the spring column 12 returns to its deformation, and pushes the valve core 13 to move towards the valve seat 17, thereby blocking the connection port 16, disconnecting the air inlet 5 from the exhaust 9, preventing the grout from continuing to overflow, and achieving the purpose of automatic grout stop.
[0031] Both ends of the valve core 13 near the valve seat 17 are provided with locking blocks 8, and both ends of the valve seat 17 near the valve core 13 are provided with locking grooves 18 that match the locking blocks 8. When the valve core 13 is connected to the valve seat 17, the locking blocks 8 are embedded in the locking grooves 18 of the valve seat 17 for positioning.
[0032] The ends of the locking blocks 8 are all rounded transition structures, and the entrances of the locking slots 18 are all chamfered, so that the locking blocks 8 can be quickly inserted into the locking slots 18 when the valve core 13 is reset.
[0033] During the movement of the valve core 13, the guide blocks 14 on both sides slide along the guide groove in the chamber 15 to ensure accurate movement direction;
[0034] A sealing groove 7 is provided on the inner wall of the overflow hole 4. A first sealing ring 20 is provided on the side of the sealing groove 7 close to the air inlet 5, and a second sealing ring 21 is provided on the side of the sealing groove 7 away from the air inlet 5, thereby improving the sealing between the air inlet 5 and the overflow hole 4.
[0035] A third sealing ring 22 is provided between the second sealing ring 21 and the first sealing ring 20, and the two ends inside the sealing groove 7 are respectively connected to the third sealing ring 22 through the return spring 19.
[0036] The cross-section of the third sealing ring 22 is trapezoidal, and the two ends of the third sealing ring 22 are tightly fitted with the inclined surfaces of the first sealing ring 20 and the second sealing ring 21, respectively.
[0037] When the grout stop valve 6 is working, the movement of the valve core 13 or the change of grout pressure will exert a force on the first sealing ring 20, which may create a gap between it and the air inlet 5. At this time, the return spring 19 can push the third sealing ring 22 to adaptively adjust its position and pressure, and always keep it in close contact with the first sealing ring 20 and the second sealing ring 21. Even under the condition of grouting pressure fluctuation, it can maintain a good sealing effect and enhance the reliability and durability of the system seal.
[0038] The specific model and specifications of the overflow sensor 3 need to be determined based on the specifications and parameters of the device. The selection and calculation method is existing technology, so it will not be described in detail here.
[0039] Working Principle: In this embodiment, during use, the construction personnel start the grouting equipment. Grout is injected from the grouting hole 2 at the bottom of the prestressed duct body 1. Under pressure, the grout fills the prestressed duct body 1 from bottom to top. Air inside the duct is discharged upward through the overflow hole 4. When the grout is full and overflows from the overflow hole 4, it contacts the sensing surface of the overflow sensor 3 inside the overflow hole 4. The overflow sensor 3, as a contact sensor, converts the physical contact signal into an electrical signal. The electrical signal is transmitted to the grouting control system, which determines that the grouting is full and controls the system accordingly. The control system sends a power-off control signal to the stop valve 6. Before receiving the control signal, the coil 10 inside the stop valve 6 is energized, generating a magnetic field that attracts the iron core 11. The iron core 11 pulls the valve core 13 open through the spring column 12, so that the connecting port 16 is in the open state, and the air inlet 5 and the exhaust 9 are connected. When the coil 10 is de-energized, the magnetic field disappears, the attraction of the iron core 11 to the valve core 13 is lost, the spring column 12 returns to its deformation, and pushes the valve core 13 to move towards the valve seat 17. During the movement of the valve core 13, the guide blocks 14 on both sides move along the inside of the chamber 15. The guide groove slides to ensure accurate movement direction. The locking blocks 8 at both ends of the valve core 13 near the valve seat 17 are embedded in the locking grooves 18 of the valve seat 17. Since the ends of the locking blocks 8 are arc transition structures and the inlet of the locking groove 18 is chamfered, it is easy to engage, thereby blocking the connecting port 16, disconnecting the air inlet 5 from the exhaust 9, preventing the slurry from continuing to overflow, and achieving the purpose of automatic slurry stop. The air inlet 5 at the bottom of the slurry stop valve 6 is embedded inside the overflow hole 4. The first sealing ring 20, the second sealing ring 21 and the trapezoidal third sealing ring in the sealing groove 7 of the inner wall of the overflow hole 4 are sealed. The sealing ring 22 fits tightly, improving the sealing between the air inlet 5 and the overflow hole 4. When the grout stop valve 6 is working, the movement of the valve core 13 or the change of grout pressure will exert a force on the first sealing ring 20, which may create a gap between it and the air inlet 5. At this time, the return spring 19 can push the third sealing ring 22 to adaptively adjust its position and pressure, always maintaining a tight fit with the first sealing ring 20 and the second sealing ring 21. Even under grouting pressure fluctuations, it can maintain a good sealing effect, enhancing the reliability and durability of the system seal.
[0040] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.
[0041] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0042] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.
[0043] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A prestressed duct overflow control device, characterized in that, The prestressed duct body includes a prestressed duct body (1), a grouting hole (2), an overflow hole (4), and an exhaust duct (9). The prestressed duct body (1) has a grouting hole (2) at its bottom end and an overflow hole (4) at its top. An overflow sensor (3) is installed inside the overflow hole (4), and a grout stop valve (6) is installed at the top of the overflow hole (4). The bottom end of the grout stop valve (6) is connected to the overflow hole (4) through an air inlet (5), and the top end of the grout stop valve (6) is equipped with an air inlet (5). An exhaust duct (9) is provided, and a connecting port (16) is provided between the exhaust duct (9) and the air intake duct (5). A valve seat (17) is provided on the outside of the connecting port (16). A valve core (13) is provided on one side of the valve seat (17). A chamber (15) is provided on one side inside the stop valve (6). A spring column (12) is provided inside the chamber (15) through an iron core (11). One end of the spring column (12) is connected to the valve core (13). A coil (10) is provided on the outside of the iron core (11).
2. The prestressed duct overflow control device according to claim 1, characterized in that: The valve core (13) is provided with guide blocks (14) on both sides near the iron core (11), and guide grooves matching the guide blocks (14) are provided on both sides inside the chamber (15).
3. The prestressed duct overflow control device according to claim 1, characterized in that: Both ends of the valve core (13) near the valve seat (17) are provided with locking blocks (8), and both ends of the valve seat (17) near the valve core (13) are provided with locking grooves (18) that match the locking blocks (8).
4. The prestressed duct overflow control device according to claim 3, characterized in that: The ends of the card blocks (8) are all rounded transition structures, and the entrances of the card slots (18) are all chamfered.
5. The prestressed duct overflow control device according to claim 1, characterized in that: The inner wall of the overflow hole (4) is provided with a sealing groove (7), and a first sealing ring (20) is provided on the side of the sealing groove (7) close to the air inlet (5), and a second sealing ring (21) is provided on the side of the sealing groove (7) away from the air inlet (5).
6. The prestressed duct overflow control device according to claim 5, characterized in that: A third sealing ring (22) is provided between the second sealing ring (21) and the first sealing ring (20), and the two ends inside the sealing groove (7) are respectively connected to the third sealing ring (22) by a reset spring (19).
7. The prestressed duct overflow control device according to claim 6, characterized in that: The third sealing ring (22) has a trapezoidal cross-section, and the two ends of the third sealing ring (22) are tightly fitted with the inclined surfaces of the first sealing ring (20) and the second sealing ring (21), respectively.
8. The prestressed duct overflow control device according to claim 1, characterized in that: The overflow sensor (3) is fixed to the outer wall of the prestressed pipe body (1) by bolts, and the detection end of the overflow sensor (3) is directly embedded in the inner cavity of the overflow hole (4).