Anti-rust device for reserved steel bar

Abstract

The utility model belongs to the technical field of building construction, and relates to an anti-rust device for a reserved steel bar, which comprises a plastic inner sleeve, a cylindrical base and a vacuum sealer, the plastic inner sleeve is arranged on the exposed section of the reserved steel bar in a sleeving mode, the bottom end of the plastic inner sleeve is fixed to the root of the exposed section of the reserved steel bar, and sealing is formed between the plastic inner sleeve and the reserved steel bar. The cylindrical base is arranged at the root of the reserved steel bar exposed section in a sleeving mode, and cement paste is poured into the cylindrical base to form a cast-in-place isolation base; the vacuum sealer is used for vacuumizing the interior of the plastic inner sleeve from the top of the plastic inner sleeve and plastically sealing the top end of the plastic inner sleeve to form a sealing part. The anti-rust device can be used for performing anti-rust protection on the exposed section of the reserved steel bar of the secondary structure, the exposed section of the reserved steel bar can be sleeved with the plastic inner sleeve, vacuumizing and sealing can be performed, so that the plastic inner sleeve isolates and protects the reserved steel bar, air and rainwater can be isolated, the reserved steel bar is not prone to rusting, the anti-rust effect is good, and before the secondary structure is constructed, the anti-rust effect is good. Therefore, the plastic inner sleeve is convenient to detach.

Description

Technical Field

[0001] The utility model belongs to the technical field of building construction, in particular to a rust-proof device for reserved steel bars. Background Art

[0002] During the construction of the main structure of the building, the secondary structural steel bars that need to be reserved are embedded in advance. This part of the steel bars is called reserved steel bars. Part of the reserved steel bars are cast in the main structure of the building, and the other part is exposed to wait for the construction of the secondary structure. Due to the delay or even suspension of the secondary structure construction, the reserved steel bars are exposed to the air for a long time and rust, which will affect the quality of the building structure. Therefore, anti-rust measures are usually taken for the reserved steel bars during the construction process.

[0003] Among the anti-rust measures for reserved steel bars, the most commonly used method is to apply plain cement slurry on the surface of the steel bars, thereby forming a protective layer on the exposed outer surface of the steel bars. The plain cement slurry protective layer on the surface of the reserved steel bars needs to be removed before the secondary structure construction.

[0004] Looking at the various anti-rust measures for reserved steel bars, the principle is mainly to isolate them from air and rainwater. Although it is simple to apply plain cement slurry on the surface of exposed steel bars, it is time-consuming and labor-intensive to clean up before secondary structure construction. If the plain cement slurry is not cleaned properly, it can easily affect the quality of the building structure. Utility Model Content

[0005] The utility model aims to provide a rust-proof device for reserved steel bars, which utilizes a plastic sleeve to cover the exposed reserved steel bars and evacuates air and rainwater to isolate them, has good rust-proof effect and is easy to dismantle.

[0006] The utility model is realized by the following technical solutions:

[0007] A rust-proof device for reserved steel bars, comprising a plastic inner sleeve, a cylindrical base and a vacuum sealer;

[0008] The plastic inner sleeve is sleeved on the exposed section of the reserved steel bar, the bottom end of the plastic inner sleeve is fixed to the root of the exposed section of the reserved steel bar, and a seal is formed between the plastic inner sleeve and the reserved steel bar to prevent rainwater and air from penetrating;

[0009] The cylindrical base is sleeved on the root of the exposed section of the reserved steel bar, and cement slurry is poured inside the cylindrical base to form a cast-in-place isolation seat. The bottom end of the plastic inner sleeve and the root of the exposed section of the reserved steel bar are sealed in the cast-in-place isolation seat, which can prevent rainwater and air from penetrating into the plastic inner sleeve from the bottom end of the plastic inner sleeve and the root of the exposed section of the reserved steel bar to corrode the steel bar;

[0010] The vacuum sealing machine is used to draw the vacuum inside the plastic inner sleeve from the top of the plastic inner sleeve and seal the top of the plastic inner sleeve to form a sealing part. After vacuuming, the plastic inner sleeve is tightly attached to the outer wall of the reserved steel bars. Under the isolation and protection of the plastic inner sleeve, it can isolate air and rainwater, making the reserved steel bars not easy to rust. Before the secondary structure construction, the plastic inner sleeve is peeled off, and the cylindrical base and cast-in-place isolation seat are removed. In particular, the cylindrical base can be broken, and then part of the cast-in-place isolation seat can be broken to facilitate the removal of the cylindrical base. The remaining cast-in-place isolation seat can be retained, which is more convenient to remove. There is no need to perform surface treatment on the reserved steel bars, which can help to quickly carry out secondary structure construction.

[0011] According to further definition, a first sleeve is provided at the bottom of the plastic inner sleeve, and the bottom of the plastic inner sleeve is sleeved on the top of the first sleeve, and the plastic inner sleeve and the first sleeve are glued and fixed to form a seal to prevent air from entering during vacuuming; an elastic rubber sleeve is provided at the bottom of the first sleeve, and the top of the elastic rubber sleeve is sleeved on the bottom of the first sleeve, and the elastic rubber sleeve and the first sleeve are glued and fixed to form a seal; the inner diameter of the elastic rubber sleeve is smaller than the outer diameter of the reserved steel bar, and the elastic rubber sleeve is tightly sleeved on the root of the exposed section of the reserved steel bar to form a seal, so that air and water are not easy to penetrate; after pouring cement slurry to form a cast-in-place isolation seat, the elastic rubber sleeve and the root of the exposed section of the reserved steel bar can form a complete seal to isolate air and rainwater; the above structure facilitates the installation of the plastic inner sleeve, the first sleeve and the elastic rubber sleeve.

[0012] Further defined, the rust-proof device also includes a plastic outer sleeve, the plastic outer sleeve is sleeved on the outside of the plastic inner sleeve, a second sleeve is arranged at the bottom of the plastic outer sleeve, a Y-shaped sleeve is arranged at the top, the bottom of the plastic outer sleeve is sleeved on the top of the second sleeve, and the plastic outer sleeve and the second sleeve are glued and fixed to form a seal, the top of the plastic outer sleeve is sleeved on the bottom of the Y-shaped sleeve, and the plastic outer sleeve and the Y-shaped sleeve are glued and fixed to form a seal; an annular top plate is arranged on the inner side of the Y-shaped sleeve, the outer side wall of the annular top plate is fixedly connected to the inner side wall of the Y-shaped sleeve by a plurality of connecting rods, and the annular top plate is placed on the top surface of the reserved steel bar, The Y-type sleeve is installed on the top of the reserved steel bar, so that the Y-type sleeve is suspended on the top of the reserved steel bar; the bottom end of the second sleeve is sealed in the cast-in-place isolation seat, and the interior of the second sleeve, the interior of the plastic outer sleeve and the interior of the Y-type sleeve are poured with cement slurry to form a protective layer. Specifically, the cement slurry is poured downward through the top of the Y-type sleeve; the above structure can further protect the reserved steel bar to prevent the plastic inner sleeve from being damaged, leaking and water inletting; when dismantling, the protective layer can be broken and the plastic inner sleeve can be peeled off. Since the cement slurry does not contact the surface of the reserved steel bar, no cement slurry will remain on the surface of the reserved steel bar, and it is more convenient to clean up before the secondary structure construction.

[0013] According to further definition, a guide sleeve is provided at the top of the cylindrical base, the guide sleeve is coaxial with the cylindrical base, and the outer wall of the guide sleeve is fixedly connected to the inner wall of the cylindrical base by a connecting plate to form a whole, and the bottom of the second sleeve is installed in the guide sleeve; after the cast-in-place cement slurry in the cylindrical base forms a cast-in-place isolation seat, the bottom end of the second sleeve can be inserted into the guide sleeve when the plastic jacket is installed, and after the Y-shaped sleeve is hung on the top of the reserved steel bar, cement slurry is poured through the top of the Y-shaped sleeve to form a protective layer, or, after the cement slurry is cast in the cylindrical base, when the cement slurry has not yet solidified, the bottom end of the second sleeve is inserted into the cement slurry to seal it in the cast-in-place isolation seat.

[0014] According to a further limitation, a first flange is integrally formed at the bottom end of the cylindrical base, which can increase the contact area with the bottom surface and make it more stable when pouring cement slurry in the cylindrical base.

[0015] In a further limitation, the plastic inner sleeve and the plastic outer sleeve are respectively made of PE, PP, or PET plastics, which are durable, moisture-proof, not easy to be damaged, and have low cost.

[0016] It is further defined that the cylindrical base, the second sleeve, the guide sleeve, the Y-shaped sleeve and the annular top plate are all made of PVC plastic, which is light, durable, anti-aging and low in cost.

[0017] According to further definition, the cylindrical base is composed of two semi-cylinders, and both side edges of each semi-cylinder are integrally formed with a second flange. The second flanges on the two semi-cylinders are connected by bolts to facilitate disassembly and assembly. Correspondingly, the guide sleeve is composed of two half-sleeves, and the two half-sleeves are respectively fixedly connected to the two semi-cylinders by connecting plates. When the two semi-cylinders are assembled to form the cylindrical base, the two half-sleeves are assembled to form the guide sleeve; specifically, the top surface of the cast-in-place isolation seat in the cylindrical base is flush with the bottom surface of the guide sleeve. After removing the bolts, it is easy to pry open the two semi-cylinders, so that the two semi-cylinders and the two half-sleeves can be reused.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The rust prevention device can be used to carry out rust prevention for the exposed section of the reserved steel bars of the secondary structure; a plastic inner sleeve can be put on the outside of the exposed section of the reserved steel bars, and vacuum and seal can be performed, so that the plastic inner sleeve can isolate and protect the reserved steel bars, isolate air and rainwater, and prevent the reserved steel bars from being easily corroded; by putting a plastic outer sleeve on the outside of the plastic inner sleeve, and pouring cement slurry in the annulus between the plastic inner sleeve and the plastic outer sleeve to form a protective layer, the stability and durability of the protective structure can be significantly improved, and the rust prevention effect is better; before the construction of the secondary structure, the plastic inner sleeve is peeled off, the protective layer is broken, the plastic inner sleeve is peeled off, and the cylindrical base and the cast-in-place isolation seat are removed, which is relatively convenient to remove. Since the cement slurry does not contact the surface of the reserved steel bars, no cement slurry will remain on the surface of the reserved steel bars, and there is no need to perform surface treatment on the reserved steel bars. It is relatively convenient to clean up before the construction of the secondary structure, which can help to quickly carry out the construction of the secondary structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0021] Figure 1 It is a cross-sectional structural schematic diagram of the utility model;

[0022] Figure 2 for Figure 1 A schematic diagram of the enlarged local structure at center A;

[0023] Figure 3 for Figure 1 A magnified schematic diagram of the local structure at B in the middle;

[0024] Figure 4 It is a three-dimensional structural schematic diagram of the utility model.

[0025] The names of the components in the figure are: 1. Plastic inner sleeve, 2. Reserved steel bars, 3. Cylindrical base, 3.1. Semi-cylinder, 3.2. Second flange, 4. Cast-in-place isolation seat, 5. Plastic outer sleeve, 6. Protective layer, 7. Y-shaped sleeve, 8. Annular top plate, 9. Sealing part, 10. First sleeve, 11. Elastic rubber sleeve, 12. First flange, 13. Guide sleeve, 14. Second sleeve. DETAILED DESCRIPTION

[0026] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0027] In the description of the present application, it should be understood that the terms "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] Example 1

[0029] A rust-proof device for reserved steel bars, such as Figures 1 to 3 As shown, it is composed of a plastic inner sleeve 1, a cylindrical base 3, a cast-in-place isolation seat 4, a plastic outer sleeve 5 and a vacuum sealer.

[0030] like Figures 1 to 3 As shown, in this embodiment, the plastic inner sleeve 1 is sleeved on the exposed section of the reserved steel bar 2, and a first sleeve 10 is provided at the bottom of the plastic inner sleeve 1. The bottom of the plastic inner sleeve 1 is sleeved on the top of the first sleeve 10, and the plastic inner sleeve 1 and the first sleeve 10 are glued and fixed to form a seal to prevent air from entering during vacuuming; the above-mentioned reserved steel bar 2 refers to a single pre-buried steel bar, which is straight or slightly bent at the top;

[0031] An elastic rubber sleeve 11 is provided at the bottom of the first sleeve 10, the top of the elastic rubber sleeve 11 is sleeved on the bottom of the first sleeve 10, and the elastic rubber sleeve 11 and the first sleeve 10 are glued and fixed to form a seal; the inner diameter of the elastic rubber sleeve 11 is smaller than the outer diameter of the reserved steel bar 2, and the elastic rubber sleeve 11 is tightly sleeved on the root of the exposed section of the reserved steel bar 2 to form a seal, so that air and water are not easy to penetrate;

[0032] The above structure facilitates the installation of the plastic inner sleeve 1, the first sleeve 10 and the elastic rubber sleeve 11; in addition, if the first sleeve 10 and the elastic rubber sleeve 11 are not provided, the bottom end of the plastic inner sleeve 1 is glued and fixed to the reserved steel bar 2 to form a seal. Since the inner diameter of the plastic inner sleeve 1 is larger than the outer diameter of the reserved steel bar 2, the adhesive material is easy to stick to the hands when the plastic inner sleeve 1 is attached to the reserved steel bar 2 after applying the adhesive material, and the plastic inner sleeve 1 is not easy to stick firmly and is easy to leak. Therefore, the combined structure of the above-mentioned plastic inner sleeve 1, the first sleeve 10 and the elastic rubber sleeve 11 is more preferred.

[0033] like Figures 1 to 3 As shown, in this embodiment, the cylindrical base 3 is sleeved on the root of the exposed section of the reserved steel bar 2, and cement slurry is poured inside the cylindrical base 3 to form a cast-in-place isolation seat 4. The bottom end of the plastic inner sleeve 1, the first sleeve 10, the elastic rubber sleeve 11 and the root of the exposed section of the reserved steel bar 2 are all sealed in the cast-in-place isolation seat 4, which can prevent rainwater and air from penetrating into the rusted steel bar from the root of the exposed section of the reserved steel bar 2;

[0034] A guide sleeve 13 is provided on the top of the cylindrical base 3. The guide sleeve 13 is coaxial with the cylindrical base 3, and the outer wall of the guide sleeve 13 is fixedly connected to the inner wall of the cylindrical base 3 through a connecting plate to form a whole.

[0035] The bottom end of the cylindrical base 3 is integrally formed with a first flange 12 , which can increase the contact area with the bottom surface and make it more stable when pouring cement slurry in the cylindrical base 3 .

[0036] like Figures 1 to 3 As shown, in this embodiment, the plastic outer sleeve 5 is sleeved on the outside of the plastic inner sleeve 1, a second sleeve 14 is provided at the bottom of the plastic outer sleeve 5, and a Y-shaped sleeve 7 is provided at the top thereof, the bottom of the plastic outer sleeve 5 is sleeved on the top of the second sleeve 14, and the plastic outer sleeve 5 and the second sleeve 14 are glued and fixed to form a seal, the top of the plastic outer sleeve 5 is sleeved on the bottom of the Y-shaped sleeve 7, and the plastic outer sleeve 5 and the Y-shaped sleeve 7 are glued and fixed to form a seal; an annular top plate 8 is provided on the inner side of the Y-shaped sleeve 7, the outer side wall of the annular top plate 8 and the inner side wall of the Y-shaped sleeve 7 are fixedly connected by a plurality of connecting rods, the annular top plate 8 is placed on the top surface of the reserved steel bar 2, and the Y-shaped sleeve 7 is sleeved on the top of the reserved steel bar 2, so that the Y-shaped sleeve 7 is suspended on the top of the reserved steel bar 2;

[0037] The bottom of the second sleeve 14 is inserted into the guide sleeve 13; after the cast-in-place cement slurry is cast in the cylindrical base 3 to form the cast-in-place isolation seat 4, the bottom end of the second sleeve 14 can be inserted into the guide sleeve 13 when the plastic jacket 5 is installed, and after the Y-shaped sleeve 7 is hung on the top of the reserved steel bar 2, cement slurry is poured through the top of the Y-shaped sleeve 7 to form a protective layer 6;

[0038] In addition, after cement slurry is cast in the cylindrical base 3 and before the cement slurry solidifies, the bottom end of the second sleeve 14 is inserted into the cement slurry, so that the bottom end of the second sleeve 14 can be sealed in the cast-in-place isolation seat 4.

[0039] In this embodiment, the vacuum sealer is used to draw vacuum from the top of the plastic inner sleeve 1 and seal the top of the plastic inner sleeve 1 to form a sealing portion 9. After vacuuming, the plastic inner sleeve 1 is tightly attached to the outer wall of the reserved steel bar 2. Under the isolation and protection of the plastic inner sleeve 1, it can isolate air and rainwater, making the reserved steel bar 2 not easy to rust.

[0040] The vacuum sealer adopts existing products, such as the rechargeable vacuum sealer for food packaging, which is easy to carry and can be used directly.

[0041] like Figures 1 to 3As shown, in this embodiment, cement slurry is poured inside the second sleeve 14, inside the plastic outer sleeve 5 and inside the Y-shaped sleeve 7 to form a protective layer 6. Specifically, the cement slurry is poured downward through the top of the Y-shaped sleeve 7. The above structure can further protect the reserved steel bars 2 to prevent the plastic inner sleeve 1 from being damaged, leaking and ingress of water.

[0042] In this embodiment, the plastic inner sleeve 1 and the plastic outer sleeve 5 are both made of PE plastic, which is durable, moisture-proof, not easy to break, and has low cost;

[0043] The cylindrical base 3, the second sleeve 14, the guide sleeve 13, the Y-shaped sleeve 7 and the annular top plate 8 are all made of PVC plastic, which is light, durable, anti-aging and low in cost.

[0044] The working principle of this embodiment is:

[0045] When the rust-proof device is used to protect the exposed section of the reserved steel bar 2 of the secondary structure, the plastic inner sleeve 1 is sleeved on the exposed section of the reserved steel bar 2, so that the elastic rubber sleeve 11 is tightly sleeved on the root of the exposed section of the reserved steel bar 2 to form a seal, so that air and water are not easy to penetrate;

[0046] The cylindrical base 3 is installed at the root of the exposed section of the reserved steel bar 2, and cement slurry is poured inside the cylindrical base 3 to form a cast-in-place isolation seat 4. The bottom end of the plastic inner sleeve 1, the first sleeve 10, and the elastic rubber sleeve 11 are all sealed in the cast-in-place isolation seat 4;

[0047] After the cast-in-place isolation seat 4 is solidified, a vacuum sealer is used to draw a vacuum from the top of the plastic inner sleeve 1 and seal the top of the plastic inner sleeve 1 to form a sealing portion 9. After vacuuming, the plastic inner sleeve 1 is tightly attached to the outer wall of the reserved steel bar 2. Under the isolation and protection of the plastic inner sleeve 1, it can isolate air and rainwater, making the reserved steel bar 2 not easy to rust;

[0048] The plastic outer sleeve 5 is sleeved on the outside of the plastic inner sleeve 1, the bottom of the second sleeve 14 is inserted into the guide sleeve 13, the annular top plate 8 is placed on the top surface of the reserved steel bar 2, and the Y-shaped sleeve 7 is sleeved on the top of the reserved steel bar 2, so that the Y-shaped sleeve 7 is suspended on the top of the reserved steel bar 2, and cement slurry is poured into the Y-shaped sleeve 7 through the top opening of the Y-shaped sleeve 7, so that the cement slurry fills the second sleeve 14, the plastic outer sleeve 5, and the Y-shaped sleeve 7. After the cement slurry solidifies, a protective layer 6 is formed, and the sealing portion 9 is sealed in the Y-shaped sleeve 7 to prevent the exposed part from infiltrating air or rainwater;

[0049] After vacuuming, the plastic inner sleeve 1 is closely attached to the outer wall of the reserved steel bar 2. Under the isolation and protection function of the plastic inner sleeve 1, air and rainwater can be isolated, so that the reserved steel bar 2 is not easy to rust. Under the protection function of the protective layer 6, the protective structure is more stable and durable.

[0050] Before the secondary structure construction, when removing the rust-proof device, the protective layer 6 is broken, the plastic inner sleeve 1 is peeled off, and the cylindrical base 3 and the cast-in-place isolation seat 4 are removed. In particular, the cylindrical base 3 can be broken, and then part of the cast-in-place isolation seat 4 can be broken to facilitate the removal of the cylindrical base 3. The remaining cast-in-place isolation seat 4 can be retained in the cast and secondary structure, which is more convenient to remove. Since the cement slurry does not contact the surface of the reserved steel bars 2, no cement slurry will remain on the surface of the reserved steel bars 2, and there is no need to perform surface treatment on the reserved steel bars 2. It is more convenient to clean up before the secondary structure construction, which can help to quickly carry out the secondary structure construction.

[0051] Example 2

[0052] A rust-proof device for reserved steel bars, such as Figure 4 As shown, the difference from Example 1 is that: the cylindrical base 3 is composed of two semi-cylinders 3.1, and both sides of each semi-cylinder 3.1 are integrally formed with a second flange 3.2. The second flanges 3.2 on the two semi-cylinders 3.1 are connected by bolts to facilitate disassembly and assembly. Correspondingly, the guide sleeve 13 is composed of two half sleeves, and the two half sleeves are respectively fixedly connected to the two semi-cylinders 3.1 through connecting plates. When the two semi-cylinders 3.1 are assembled to form the cylindrical base 3, the two half sleeves are assembled to form the guide sleeve 13; specifically, the top surface of the cast-in-place isolation seat 4 in the cylindrical base 3 is flush with the bottom surface of the guide sleeve 13. After removing the bolts, it is easy to pry open the two semi-cylinders 3.1, so that the two semi-cylinders 3.1 and the two half sleeves can be reused.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A rust-proof device for reserved steel bars, characterized in that: include: A plastic inner sleeve (1), wherein the plastic inner sleeve (1) is sleeved on the exposed section of the reserved steel bar (2), the bottom end of the plastic inner sleeve (1) is fixed to the root of the exposed section of the reserved steel bar (2) and a seal is formed between the plastic inner sleeve (1) and the reserved steel bar (2); A cylindrical base (3) is sleeved on the root of the exposed section of the reserved steel bar (2), cement slurry is poured inside the cylindrical base (3) to form a cast-in-place isolation seat (4), and the bottom end of the plastic inner sleeve (1) and the root of the exposed section of the reserved steel bar (2) are both sealed in the cast-in-place isolation seat (4); A vacuum sealer is used to draw a vacuum from the top of the plastic inner sleeve (1) inside the plastic inner sleeve (1) and to seal the top of the plastic inner sleeve (1) to form a sealing portion (9).

2. The rust-proof device for reserved steel bars according to claim 1, characterized in that: The bottom of the plastic inner sleeve (1) is provided with a first sleeve (10), the bottom of the plastic inner sleeve (1) is sleeved on the top of the first sleeve (10), and the plastic inner sleeve (1) and the first sleeve (10) are glued and fixed; the bottom of the first sleeve (10) is provided with an elastic rubber sleeve (11), the top of the elastic rubber sleeve (11) is sleeved on the bottom of the first sleeve (10), and the elastic rubber sleeve (11) and the first sleeve (10) are glued and fixed; the inner diameter of the elastic rubber sleeve (11) is smaller than the outer diameter of the reserved steel bar (2), and the elastic rubber sleeve (11) is tightly sleeved on the root of the exposed section of the reserved steel bar (2) to form a seal.

3. The rust-proof device for reserved steel bars according to claim 1, characterized in that: The rust-proof device further comprises a plastic outer sleeve (5), wherein the plastic outer sleeve (5) is sleeved on the outside of the plastic inner sleeve (1), a second sleeve (14) is arranged at the bottom of the plastic outer sleeve (5), a Y-shaped sleeve (7) is arranged at the top of the plastic outer sleeve (5), the bottom of the plastic outer sleeve (5) is sleeved on the top of the second sleeve (14), and the plastic outer sleeve (5) and the second sleeve (14) are fixed by gluing, the top of the plastic outer sleeve (5) is sleeved on the bottom of the Y-shaped sleeve (7), and the plastic outer sleeve (5) and the Y-shaped sleeve (7) are fixed by gluing; An annular top plate (8) is arranged on the inner side of the Y-shaped sleeve (7); the outer side wall of the annular top plate (8) and the inner side wall of the Y-shaped sleeve (7) are fixedly connected via a plurality of connecting rods; the annular top plate (8) is placed on the top surface of the reserved steel bars (2); the Y-shaped sleeve (7) is sleeved on the top of the reserved steel bars (2); the bottom end of the second sleeve (14) is sealed in the cast-in-place isolation seat (4); the interior of the second sleeve (14), the interior of the plastic jacket (5) and the interior of the Y-shaped sleeve (7) are all poured with cement slurry to form a protective layer (6).

4. The rust-proof device for reserved steel bars according to claim 3 is characterized in that: A guide sleeve (13) is arranged on the top of the cylindrical base (3); the guide sleeve (13) and the cylindrical base (3) are coaxial, and the outer wall of the guide sleeve (13) and the inner wall of the cylindrical base (3) are fixedly connected via a connecting plate; the bottom of the second sleeve (14) is inserted into the guide sleeve (13).

5. The rust-proof device for reserved steel bars according to claim 4 is characterized in that: The bottom end of the cylindrical base (3) is integrally formed with a first flange (12).

6. The rust-proof device for reserved steel bars according to claim 4, characterized in that: The plastic inner sleeve (1) and the plastic outer sleeve (5) are respectively made of PE, PP, or PET plastic.

7. The rust-proof device for reserved steel bars according to claim 4, characterized in that: The cylindrical base (3), the second sleeve (14), the guide sleeve (13), the Y-shaped sleeve (7) and the annular top plate (8) are all made of PVC plastic.

8. The rust-proof device for reserved steel bars according to claim 4, characterized in that: The cylindrical base (3) is composed of two half-cylinders (3.1), and both sides of each half-cylinder (3.1) are integrally formed with a second flange (3.2). The second flanges (3.2) on the two half-cylinders (3.1) are connected by bolts. The guide sleeve (13) is composed of two half-sleeves, and the two half-sleeves are fixedly connected to the two half-cylinders (3.1) respectively by connecting plates.

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