Anchorage device sealing structure for prestressed tendon

Abstract

The utility model discloses an anchorage device sealing structure for a prestressed tendon. The anchorage device sealing structure comprises an inner sealing head, an outer joint and an outer sealing ring, the inner sealing head comprises a straight cylinder section and a conical section extending outwards from one end of the straight cylinder section; the conical section is located in the anchor bearing plate and the outer wall size is matched with the inner wall size of the small-opening end of the anchor bearing plate; the straight cylinder section is located outside the small opening end of the anchor bearing plate and connected with one end of the outer connector through a buckle structure, and the other end of the outer connector is connected with one end of the prestressed pipeline. The outer sealing ring sleeves the outer ring of the straight cylinder section and is positioned between the small-opening end of the anchor backing plate and the end face of the outer joint; after the outer connector is installed, the small-opening end of the anchor bearing plate and the end face of the outer connector extrude the outer sealing ring to generate elastic deformation. According to the anchorage device sealing structure for the prestressed tendon, the stability of connection between the anchor bearing plate and a prestressed pipeline can be guaranteed, and the sealing performance between the outer connector and the anchor bearing plate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of anchor seal, in particular to an anchor seal structure for prestressed tendons. Background Art

[0002] For traditional post-tensioned bonded prestressed tendons, the steel strand is placed in the prestressed duct. The prestressed duct is generally mainly made of metal or plastic corrugated pipe. The metal corrugated pipe is formed by rolling and pressing metal steel strips; while the plastic corrugated pipe has better sealing performance than the metal corrugated pipe and can also isolate the electrochemical reaction in the structure. Therefore, by utilizing the sealing and isolation performance of the plastic corrugated pipe to enhance the connection between the anchor backing plate and the anchor head, the sealing performance of the anchor head and the prestressed duct can be enhanced, thereby improving the anti-corrosion ability of the prestressed tendon.

[0003] However, in most of the existing sealing structures or sealing devices, the main focus is on overall sealing and isolation, with the emphasis on the overall anti-corrosion of the anchoring system, while neglecting the sealing performance between the anchor backing plate and the prestressed duct. For example, Chinese Patent CN106835985A discloses an electrically isolated prestressed anchoring system and its construction and installation method, which includes a working anchor plate, an anchor backing plate, working wedge grips, prestressed tendons, grout, structural reinforcement, and concrete installed in sequence, as well as insulating components such as an insulating anchor cover, a compressive insulating pad, an insulating inner lining sleeve, an insulating connector, and an insulating corrugated pipe; the insulating anchor cover is fixed on the anchor backing plate through fasteners to completely cover the working anchor plate; the working anchor plate cooperates with the anchor backing plate, and there is a compressive insulating pad between the end face of the anchor backing plate and the insulating inner lining sleeve; the compressive insulating pad is of an annular structure, the insulating inner lining sleeve is installed inside the anchor backing plate, and its inner and outer diameters match the inner diameter of the anchor backing plate. The insulating inner lining sleeve is connected to the insulating corrugated pipe through an insulating connector; an assembly hole for connecting a grouting pipe to pour insulating slurry is opened in the middle part of the cylindrical surface of the insulating connector; when this system is connected with an electrically isolated performance detector, it constitutes a detectable electrically isolated anchoring system. Heat shrink sleeves for sealing are installed at the contact between the insulating inner lining sleeve and the small end face of the anchor backing plate and the insulating connector, and at the contact between the insulating corrugated pipe and the insulating connector. In the use state, the heat shrink sleeves are melted and completely cover the contact between the insulating inner lining sleeve and the small end face of the anchor backing plate and the insulating connector, and the contact between the insulating corrugated pipe and the insulating connector. This anchoring system only plays a role of relative fixed connection and sealing between the anchor backing plate and the prestressed duct through heat shrink tubes. During the use process, problems such as the sealing structure (heat shrink sleeve) falling off, resulting in the failure of the connection structure and the sealing structure are likely to occur. Summary of the Utility Model

[0004] Aiming at the above problems, the utility model provides an anchor seal structure for prestressed tendons, aiming to solve the problems in the prior art that only heat shrink tubes are used for connection and sealing between the anchor backing plate and the prestressed duct, which are likely to fall off during the use process, resulting in the failure of the connection structure and the sealing structure.

[0005] The present utility model adopts the following technical solutions to achieve the above purposes:

[0006] An anchorage sealing structure for prestressing tendons is used for sealing and connecting an anchor backing plate and a prestressing duct; the sealing structure includes an inner sealing head, an outer joint, and an outer sealing ring; the inner sealing head includes a straight cylinder section and a conical section extending outward from one end of the straight cylinder section; the conical section is located inside the anchor backing plate and the outer wall size thereof is adapted to the inner wall size of the small end of the anchor backing plate; the straight cylinder section is located outside the small end of the anchor backing plate and is connected to one end of the outer joint through a snap structure, and the other end of the outer joint is connected to one end of the prestressing duct; the outer sealing ring is sleeved on the outer ring of the straight cylinder section and is located between the small end of the anchor backing plate and the end face of the outer joint; after installing the outer joint, the small end of the anchor backing plate and the end face of the outer joint squeeze the outer sealing ring to cause elastic deformation.

[0007] During the installation process of this technical solution, the outer wall of the conical section of the inner sealing head is closely attached to the inner wall of the small end of the anchor backing plate, the outer sealing ring is sleeved on the outer ring of the straight cylinder section of the inner sealing head, and the outer joint moves along the outer ring of the straight cylinder section towards the small end of the anchor backing plate. When the snap structure is installed in cooperation, the end face of the small end of the anchor backing plate and the end face of the outer joint clamp the outer sealing ring, and at the same time, keep the outer wall of the conical section of the inner sealing head closely attached to the inner wall of the small end of the anchor backing plate, with a conical wedging effect. On the one hand, it can ensure the stability of the connection between the anchor backing plate and the prestressing duct, and on the other hand, improve the sealing performance between the outer joint and the anchor backing plate.

[0008] A further technical solution is that the snap structure includes a buckle portion located at one end of the straight cylinder section of the inner sealing head and a groove located on the inner wall of the outer joint for cooperating with the buckle portion. In this technical solution, the outer joint is sleeved on the outside of the straight cylinder section, so that the buckle portion at one end of the straight cylinder section is buckled with the groove on the inner wall of the outer joint to realize the connection between the outer joint and the inner sealing head.

[0009] A further technical solution is that a notch along its axial direction is further provided on the side wall of one end of the straight cylinder section of the inner sealing head. In this technical solution, the notch structure makes the buckle portion of the straight cylinder section have a certain elasticity, which can facilitate the installation of the straight cylinder section into the inside of the outer joint.

[0010] A further technical solution is that it further includes an inner sealing ring, and an annular groove is provided on the outer wall of the conical section, and the inner sealing ring is in interference fit with the annular groove and the inner wall of the anchor backing plate. In this technical solution, after the connection structure is installed, the outer wall of the conical section of the inner sealing head is closely attached to the inner wall of the small end of the anchor backing plate, and the inner sealing ring can further improve the stability of the anchoring system.

[0011] A further technical solution is that it further includes a heat shrinkable sleeve, and the heat shrinkable sleeve is sleeved on the outer rings of the small end of the anchor backing plate, the outer joint, and the prestressing duct. In this technical solution, the heat shrinkable sleeve can further improve the stability and sealing performance of the anchoring system.

[0012] A further technical solution is that the inner wall of the conical section is provided with an arc surface inclined along the diverging direction of the prestressing tendon. The arc surface design of this technical solution can prevent the inner sealing head from contacting the prestressing tendon.

[0013] A further technical solution is that the pipe orifice of the prestressing duct is inserted into the interior of the outer joint, and an interference-fitted pipe sealing ring is provided between the outer ring of the pipe orifice and the inner ring of the outer joint. In this technical solution, in the traditional shrink sleeve connection and sealing structure, the connection and sealing performance of the anchor can be ensured even when the shrink sleeve falls off.

[0014] A further technical solution is that an adjusting ring is further included. The adjusting ring is sleeved on the outer ring of the straight barrel section of the inner sealing head and is located between the end face of the outer sealing ring opposite to the outer connecting head. In this technical solution, by changing the structure, thickness or stacking quantity of the adjusting ring, the pressing and sealing degree between the inner sealing head and the outer joint can be adjusted.

[0015] A further technical solution is that the snap structure includes a groove located on the outer wall of the straight barrel section of the inner sealing head and a buckling portion located on the inner wall of the outer joint and cooperating with the groove.

[0016] The beneficial effects of the present utility model are as follows:

[0017] For the prestressing tendon anchor sealing structure provided by the present utility model, after installation, the small end of the anchor backing plate and the end face of the outer joint extrude the outer sealing ring to generate elastic deformation. At the same time, the outer wall of the conical section of the inner sealing head keeps close contact with the inner wall of the small end of the anchor backing plate, which can ensure the stability of the connection between the anchor backing plate and the prestressing duct and improve the sealing performance between the outer joint and the anchor backing plate. Description of the Drawings

[0018] Figure 1 They are: the application schematic diagram of the prestressing tendon anchor sealing structure of the present utility model.

[0019] Figure 2 They are: the structural schematic diagram of the inner sealing head of the present utility model.

[0020] Figure 3 They are: the structural schematic diagram of the outer joint of the present utility model.

[0021] Figure 4 They are: the schematic diagram of the sealing structure of the present utility model applied to a bamboo joint type prestressing duct.

[0022] Figure 5 They are: the schematic diagram of the sealing structure of the present utility model applied to a spiral type prestressing duct.

[0023] In the figure:

[0024] 1. Anchor plate; 2. Prestressed duct; 3. Inner seal head; 30. Annular groove; 31. Straight tube section; 32. Tapered section; 33. Buckle part; 330. Notch; 4. Outer joint; 40. Groove; 5. Outer seal ring; 51. Inner seal ring; 53. Duct seal ring; 6. Adjusting ring. Detailed implementation manner

[0025] The following combines the appended Figures 1 to 5 drawings and the detailed implementation manner to describe the present utility model in detail. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0026] As Figures 1 to 4 shown, this implementation manner provides a sealing structure for an anchor for prestressed tendons, which is used for sealing and connecting the anchor plate 1 and the prestressed duct 2; the sealing structure includes an inner seal head 3, an outer joint 4, and an outer seal ring 5; the inner seal head 3 includes a straight tube section 31 and a tapered section 32 extending outward from one end of the straight tube section 31; the tapered section 32 is located inside the anchor plate 1 and the outer wall size is adapted to the inner wall size of the small end of the anchor plate 1; the straight tube section 31 is located outside the small end of the anchor plate 1 and is connected to one end of the outer joint 4 through a snap structure, and the other end of the outer joint 4 is connected to one end of the prestressed duct 2; the outer seal ring 5 is sleeved on the outer ring of the straight tube section 31 and is located between the small end of the anchor plate 1 and the end face of the outer joint 4; after installing the outer joint 4, the small end of the anchor plate 1 and the end face of the outer joint 4 squeeze the outer seal ring 5 to generate elastic deformation.

[0027] Specifically, in this embodiment, the prestressed duct 2 is a corrugated pipe with bamboo joints, which is used to thread prestressed tendons. The corrugated pipe with bamboo joints has a corrugated structure. The part with a larger outer diameter is the wave crest, and the part with a smaller outer diameter is the wave trough. The connection between the prestressed duct 2 and the outer joint 4 can adopt the structure of the existing technology or the heat shrinkable sleeve method in the following embodiment; specifically, the buckle structure includes a buckle portion 33 at one end of the straight cylinder section 31 of the inner sealing head 3 and a groove 40 on the inner wall of the outer joint 4 that cooperates with the buckle portion 33. The buckle portion 33 can be prepared from a material with certain resilience, or a notch 330 is opened on the side wall at one end of the straight cylinder section 31 of the inner sealing head 3 along its axial direction. The notch structure makes the buckle portion 33 of the straight cylinder section 31 have certain elasticity, which is convenient for the straight cylinder section 31 to be installed inside the outer joint 4 and buckled with the groove 40; during the installation process, the outer wall of the tapered section 32 of the inner sealing head 3 is closely attached to the inner wall of the small end of the anchor plate 1. The outer sealing ring 5 is sleeved on the outer ring of the straight cylinder section 31 of the inner sealing head 3. The end face of the outer joint 4 moves along the outer ring of the straight cylinder section 31 towards the small end of the anchor plate 1. When the installation of the buckle portion 33 and the groove 40 is completed, the end face of the small end of the anchor plate 1 and the end face of the outer joint 4 clamp the outer sealing ring 5, causing the outer sealing ring 5 to undergo elastic deformation, and at the same time keeping the tapered section 32 of the inner sealing head 3 closely attached to the inner wall of the small end of the anchor plate 1. Therefore, for the sealing structure after installation, on the one hand, it can ensure the stability of the connection between the anchor plate 1 and the prestressed duct 2, and on the other hand, it improves the sealing performance between the outer joint 4 and the anchor plate 1.

[0028] The above embodiment exemplarily shows the specific position distribution of the buckle structure and the specific structural shape of the prestressed duct 2. In other embodiments or practical applications, other methods can also be used for substitution. For example, the buckle portion is arranged on the inner ring of the outer joint 4, and the groove is opened on the outer ring of the straight cylinder section of the inner sealing head; as Figure 5 shown, the prestressed duct 2 can also be a structure with a spiral line on the outside. The material can be one of metal or plastic. The inner wall of one end of the outer joint 4 connected to the prestressed duct 2 should be provided with a groove with the same spiral line, which is convenient for the prestressed duct 2 to be screwed in for installation.

[0029] In another embodiment, on the basis of the above embodiment, an inner sealing ring 51 is further included. An annular groove 30 is opened on the outer wall of the tapered section 32, and the inner sealing ring 51 is installed between the annular groove 30 and the inner wall of the anchor plate 1. After the connection structure is installed, the outer wall of the tapered section 32 of the inner sealing head 3 is closely attached to the inner wall of the small end of the anchor plate 1, that is, the lower wall of the annular groove 30 and the inner wall of the small end of the anchor plate 1 clamp the inner sealing ring 51, which can further improve the stability and sealing performance of the anchoring system.

[0030] Another embodiment, on the basis of the above embodiment, further includes a heat shrinkable sleeve, which is sleeved on the small end of the anchor plate 1, the outer joint 4 and the outer ring of the prestressed duct 2. The heat shrinkable sleeve can further improve the stability and sealing performance of the anchoring system.

[0031] Another embodiment, on the basis of the above embodiment, the inner wall of the tapered section 32 is provided with an arc surface inclined along the divergent direction of the prestressed tendon. The arc surface design can prevent the inner seal head 3 from contacting the prestressed tendon.

[0032] Another embodiment, on the basis of the above embodiment, a pipe sealing ring 21 is provided between the outer joint 4 and the trough of the corrugated pipe installed inside it. The pipe sealing ring 21 is in interference fit with the outer ring of the corrugated pipe and the inner ring of the outer joint 4. The pipe sealing ring 21 can further improve the sealing performance between the outer joint 4 and the prestressed duct 2.

[0033] Another embodiment, on the basis of the above embodiment, further includes an adjusting ring 6, which is sleeved on the outer ring of the straight cylinder section 31 of the inner seal head 3 and is located between the end faces of the outer seal ring 5 and the outer connecting head 4 opposite to each other. By changing the structure, thickness or stacking number of the adjusting ring 6, the pressing and sealing degree between the inner seal head 3 and the outer joint 4 can be adjusted.

[0034] For an anchoring and sealing structure for prestressed tendons provided by the present utility model, during the installation process, the outer wall of the tapered section 32 of the inner seal head 3 is closely attached to the inner wall of the small end of the anchor plate 1. The outer seal ring 5 is sleeved on the outer ring of the straight cylinder section 31 of the inner seal head 3. The end face of the outer joint 4 moves along the outer ring of the straight cylinder section 31 towards the small end of the anchor plate 1. When the fitting installation of the buckle portion 33 and the groove 40 is completed, the end face of the small end of the anchor plate 1 and the end face of the outer joint 4 clamp the outer seal ring 5, causing the outer seal ring 5 to undergo elastic deformation, and at the same time keeping the tapered section 32 of the inner seal head 3 closely attached to the inner wall of the small end of the anchor plate 1. Therefore, for the sealing structure after installation, on the one hand, it can ensure the stability of the connection between the anchor plate 1 and the prestressed duct 2, and on the other hand, it can improve the sealing performance between the outer joint 4 and the anchor plate 1.

Claims

1. An anchor sealing structure for prestressed tendons, characterized in that, For sealing and connecting an anchor plate and a prestressed duct; the sealing structure includes an inner sealing head, an outer joint, and an outer sealing ring; The inner sealing head includes a straight cylinder section and a tapered section extending outward from one end of the straight cylinder section; the tapered section is located inside the anchor plate and the outer wall size is adapted to the inner wall size of the small end of the anchor plate; the straight cylinder section is located outside the small end of the anchor plate and is connected to one end of the outer joint through a snap structure, and the other end of the outer joint is connected to one end of the prestressed duct; The outer sealing ring is sleeved on the outer ring of the straight cylinder section and is located between the small end of the anchor plate and the end face of the outer joint; after installing the outer joint, the small end of the anchor plate and the end face of the outer joint squeeze the outer sealing ring to cause elastic deformation.

2. The anchor seal structure for prestressing tendons according to claim 1, characterized in that, The snap structure includes a buckle portion located at one end of the straight cylinder section of the inner sealing head and a groove located on the inner wall of the outer joint for cooperating with the buckle portion.

3. The anchor seal structure for prestressing tendons according to claim 2, characterized in that, One end side wall of the straight cylinder section of the inner sealing head is further provided with a notch along its axial direction.

4. The prestressing tendon anchor sealing structure according to claim 1, characterized in that, It further includes an inner sealing ring, and an annular groove is formed on the outer wall of the tapered section, and the inner sealing ring is in interference fit with the annular groove and the inner wall of the anchor plate.

5. The anchor seal structure for prestressing tendons according to claim 1, characterized in that, It further includes a heat shrinkable sleeve, and the heat shrinkable sleeve is sleeved on the outer rings of the small end of the anchor plate, the outer joint, and the prestressed duct.

6. The anchor seal structure for prestressing tendons according to claim 1, characterized in that, The inner wall of the tapered section is provided with an arc surface inclined along the divergent direction of the prestressed tendon.

7. The anchor seal structure for prestressing tendons according to claim 1, characterized in that The pipe orifice of the prestressed duct is inserted into the inside of the outer joint, and an interference-fit pipe sealing ring is provided between the outer ring of the pipe orifice and the inner ring of the outer joint.

8. The anchorage sealing structure for prestressing tendons according to claim 1, characterized in that, It further includes an adjusting ring, and the adjusting ring is sleeved on the outer ring of the straight cylinder section of the inner sealing head and is located between the outer sealing ring and the end face opposite to the outer connector.

9. The anchorage sealing structure for prestressing tendons according to claim 1, characterized in that, The snap structure includes a groove located on the outer wall of the straight cylinder section of the inner sealing head and a buckle portion located on the inner wall of the outer joint for cooperating with the groove.

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