A kind of assembly and method for anticorrosion of prestressed anchor rod (cable) free section

Abstract

The application provides an assembly and a method for anticorrosion of a free section of a prestressed anchor rod (cable), and particularly relates to the field of anchor rod (cable) anticorrosion technology. The anticorrosion assembly comprises a protective sleeve, the protective sleeve is sleeved on the surface of the anchor rod or anchor cable, and at least one sleeve opening is arranged on the surface of the protective sleeve; the protective sleeve is provided with a detachable sealing device; the sealing device is provided with a grouting hole, the position of the grouting hole corresponds to the position of the sleeve opening; the grouting hole is connected with one end of a pressurizing pipe, and the other end of the pressurizing pipe is connected with a pressurizing pump. The detachable sealing device is used for injecting anticorrosion material into the protective sleeve sleeved on the anchor rod or anchor cable, the sealing device is removed and the sleeve opening is sealed in the later period, the anticorrosion requirement can be met, and the overall installation of the rod body in the later period is not affected, the application has the advantages of simple structure, safety and reliability, and effectively shortens the construction period and reduces the engineering cost.

Description

A component and method for corrosion protection of the free section of prestressed anchor bolts (cables) Technical Field

[0001] This invention patent relates to the field of anchor bolt (cable) corrosion protection technology, specifically to a component method for corrosion protection of the free section of a prestressed anchor bolt (cable). Background Technology

[0002] With the increasing number of permanent slope treatment and basement anti-buoyancy projects, anchor bolts (cables) are becoming more widely used as an effective solution for such projects. However, the corrosion prevention of the free section of anchor bolts (cables) is a major problem restricting the application of permanent anchor bolts. Traditional corrosion prevention measures include applying rust-removing paint, applying grease, or modifying with full-length bonded anchor cables. However, these measures have drawbacks such as difficult construction, poor corrosion prevention effect, and easy leakage in the later stage, which seriously restricts the application of anchor bolts (cables).

[0003] Due to the aforementioned deficiencies, further improvements and refinements are needed in this field. Therefore, this invention provides a component and method for corrosion protection of the free section of a prestressed anchor (cable) to meet the corrosion protection and durability requirements of the free section of the anchor (cable). Summary of the Invention

[0004] To overcome the shortcomings of existing technologies and address the problems of difficult construction, poor corrosion protection, and easy leakage in traditional anti-corrosion measures, this invention provides a component and method for corrosion protection of the free section of prestressed anchor rods (cables). The specific technical solution is as follows:

[0005] An assembly for corrosion protection of the free section of a prestressed anchor bolt / cable includes a protective sleeve fitted onto the surface of the anchor bolt or cable, the protective sleeve having at least one sleeve opening on its surface; the protective sleeve having a detachable sealing device; the sealing device having a grouting hole positioned corresponding to the sleeve opening; the grouting hole being connected to one end of a pressure pipe, the other end of which being connected to a pressure pump.

[0006] Preferably, the sealing device includes a sealing upper cover, a sealing lower cover, connecting bolts, and connecting nuts; one side of the sealing upper cover and the sealing lower cover is provided with a threaded sleeve, and the other side is provided with corresponding connecting lugs; the threaded sleeve is provided with an internal thread that matches the connecting bolts; the sides of the sealing upper cover and the sealing lower cover with threaded sleeves are connected by connecting bolts, and the sides of the sealing upper cover and the sealing lower cover with connecting lugs are connected by connecting nuts; the inner sidewall of the sealing upper cover is also provided with a 1-2mm thick guide groove corresponding to the position of the sleeve opening.

[0007] Preferably, both the upper and lower sealing covers are semi-cylindrical tubular structures, and the sealing device is made of steel or plastic.

[0008] Preferably, there is a gap between the protective sleeve and the anchor rod or anchor cable, and anti-corrosion material is injected into the gap through a pressure pipe and a pressure pump.

[0009] Preferably, the anti-corrosion material is made of a fluid or semi-fluid anti-corrosion material.

[0010] Preferably, the number and spacing of the sleeve openings are set according to the actual length of the protective sleeve.

[0011] More preferably, the pressurizing tube is made of a metal tube with threads at both ends.

[0012] More preferably, the protective sleeve is made of plastic tubing.

[0013] A corrosion protection method for the free section of prestressed anchor bolts / cables, employing the aforementioned components for corrosion protection of the free section of prestressed anchor bolts / cables, specifically includes the following steps:

[0014] S1. Installation of protective sleeve

[0015] Before installing the sleeve, apply lubricating grease to the outer surface of the free section of the prestressed anchor rod or anchor cable; then select a protective sleeve with an inner diameter 3-4 mm larger than the outer diameter of the anchor rod or anchor cable and install it on the surface of the anchor rod or anchor cable, without sealing both ends for the time being.

[0016] S2. Protective sleeve opening

[0017] Based on the actual length of the protective sleeve, one or more 5-10mm openings are made on the surface of the protective sleeve for injecting anti-corrosion material.

[0018] S3. Sealing device installation

[0019] The upper and lower sealing covers are fitted onto the opening of the protective sleeve using connecting bolts and nuts, and the positions of the grouting hole and the guide groove correspond to the opening of the sleeve; wherein, the inner diameter of the sealing device is 1-2mm smaller than the outer diameter of the protective sleeve.

[0020] S4. Install pressurization device

[0021] Connect one end of the pressurization pipe to the grouting hole and the other end to the pressurization pump;

[0022] S5. Inject anti-corrosion material

[0023] Turn on the pressure pump and inject anti-corrosion material into the protective sleeve. After the anti-corrosion material overflows from the openings at both ends of the protective sleeve, seal the openings at both ends of the protective sleeve by heat fusion or wire binding.

[0024] S6. Remove the sealing device

[0025] After sealing both ends of the protective sleeve, remove the sealing device and ensure that the opening side of the sleeve faces upward. After standing for 5 minutes, seal the opening of the sleeve with one of the following: plastic wrap, rubber sleeve, waterproof tape, or sealant.

[0026] The beneficial effects of this invention are:

[0027] This invention injects anti-corrosion material into a protective sleeve fitted over the anchor rod or anchor cable through a detachable sealing device. The sealing device is then removed and the opening of the protective sleeve is sealed. This satisfies the anti-corrosion requirements without affecting the subsequent overall lowering and installation of the rod. This invention has a simple structure, is safe and reliable, and effectively shortens the construction period and reduces the project cost. Attached Figure Description

[0028] The accompanying drawings constituting this application are provided to further understand this application and do not constitute an undue limitation of this application.

[0029] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 is a cross-sectional view of the present invention.

[0031] Figure 3 is a schematic diagram of the opening position of the protective sleeve in this invention;

[0032] Figure 4 is a schematic diagram of the sealing upper cover and sealing lower cover;

[0033] Figure 5 is a schematic diagram of the installation of the pressure pipe in this invention;

[0034] In the diagram, 1-protective sleeve; 101-sleeve opening; 2-anchor rod or anchor cable; 3-sealing top cover; 301-grouting hole; 302-guide channel; 4-sealing bottom cover; 5-threaded sleeve; 6-connecting ear plate; 7-connecting bolt; 8-connecting nut; 9-pressure pipe. Detailed Implementation

[0035] The specific implementation of the component and method for corrosion protection of the free section of prestressed anchor rods (cables) provided by the present invention will be further described in conjunction with the accompanying drawings and embodiments.

[0036] As shown in Figures 1-3, a component for corrosion protection of the free section of a prestressed anchor rod (cable) includes a protective sleeve 1, which is fitted onto the surface of the anchor rod or anchor cable 2. The surface of the protective sleeve 1 has at least one sleeve opening 101. A sealing device is provided on the protective sleeve 1 corresponding to the sleeve opening 101; wherein the inner diameter of the sealing device is slightly smaller than the outer diameter of the protective sleeve. Preferably, a grouting hole 301 is also provided on the sealing device corresponding to the sleeve opening 101; wherein the grouting hole 301 is connected to one end of a pressure pipe 9, and the other end of the pressure pipe 9 is connected to a pressure pump for the anti-corrosion material.

[0037] As shown in Figure 4, the sealing device includes a sealing upper cover 3, a sealing lower cover 4, a connecting bolt 7, and a connecting nut 8. One side of the sealing upper cover 3 and the sealing lower cover 4 is provided with a threaded sleeve 5, and the other side is provided with a corresponding connecting lug 6. The threaded sleeve 5 has an internal thread that matches the connecting bolt 7. The sides of the sealing upper cover 3 and the sealing lower cover 4 with the threaded sleeve 5 are connected by the connecting bolt 7, and the sides of the sealing upper cover 3 and the sealing lower cover 4 with the connecting lug 6 are connected by the connecting nut 8. Preferably, the inner wall of the sealing upper cover 3 is also provided with a 1-2mm thick guide groove 302 corresponding to the position of the sleeve opening 101, ensuring that even if the grouting hole 301 is slightly deviated from the sleeve opening 101, the injected anti-corrosion material can still be well introduced into the sleeve opening 101 of the protective sleeve 1.

[0038] Preferably, both the upper sealing cover 3 and the lower sealing cover 4 are semi-cylindrical tubular structures, and the sealing device is made of steel or plastic material, which can be selected according to the construction requirements.

[0039] Preferably, a gap of approximately 3-4 mm is required between the protective sleeve 1 and the anchor rod or anchor cable 2. Anti-corrosion material is injected into this gap through the pressure pipe 9 and the pressure pump, thereby providing anti-corrosion protection for the anchor rod or anchor cable 2. More preferably, the anti-corrosion material can be made of a fluid or semi-fluid anti-corrosion material, such as lithium-based ester butter.

[0040] More preferably, the number and spacing of the sleeve openings 101 need to be set according to the actual length of the protective sleeve 1.

[0041] More preferably, the protective sleeve 1 is made of plastic tubing.

[0042] A corrosion protection method for the free section of a prestressed anchor (cable), the specific method including the following steps:

[0043] S1. Installation of protective sleeve

[0044] Before installing the sleeve, apply lubricating grease to the free section of the prestressed anchor rod (cable), i.e., the outer surface of the anchor rod or anchor cable 2, to increase lubrication; then select a protective sleeve 1 with an inner diameter 3-4 mm larger than the outer diameter of the anchor rod or anchor cable 2 and install it on the surface of the anchor rod or anchor cable 2, and do not seal the two ends of the protective sleeve 1 temporarily.

[0045] S2. Protective sleeve opening

[0046] Based on the actual length of the protective sleeve 1, one or more 5-10mm sleeve openings 101 are made on the surface of the protective sleeve 1 for injecting anti-corrosion material.

[0047] S3. Sealing device installation

[0048] The sealing upper cover 3 and sealing lower cover 4 are fitted onto the sleeve opening 101 of the protective sleeve 1 using connecting bolts 7 and connecting nuts 8, and the positions of the grouting hole 301 and the guide groove 302 correspond to the positions of the sleeve opening 101. The inner diameter of the sealing device is 1-2 mm smaller than the outer diameter of the protective sleeve 1, but at the same time, it is necessary to ensure that the protective sleeve 1 and the anchor rod or anchor cable 2 are not in close contact, so as to ensure that the anti-corrosion material can flow freely.

[0049] S4. Install pressurization device

[0050] One end of the pressurizing pipe 9 is connected to the grouting hole 301, and the other end is connected to the pressurizing pump. Preferably, the pressurizing pipe 9 is made of a metal pipe with threads at both ends, which facilitates a tight connection with the pressurizing pump and the sealing device, as shown in Figure 5.

[0051] S5. Inject anti-corrosion material

[0052] Turn on the pressure pump and inject anti-corrosion material into the protective sleeve 1. When the anti-corrosion material is full and overflows from the openings at both ends of the protective sleeve 1, seal the openings at both ends of the protective sleeve 1 by heat fusion or by using tie wire.

[0053] S6. Remove the sealing device

[0054] After sealing both ends of the protective sleeve 1, remove the sealing device and ensure that the side of the protective sleeve 1 with the sleeve opening 101 faces upward. Since the anti-corrosion material is injected into the protective sleeve 1 under high pressure, some anti-corrosion material will overflow from the sleeve opening 101 after the sealing device is removed. Therefore, the anti-corrosion treatment of the free section of the prestressed anchor rod (cable) can be completed by letting it stand for 5 minutes and then sealing the sleeve opening 101 with any of the following methods: plastic wrap, rubber sleeve, waterproof tape, or sealant.

[0055] This invention injects anti-corrosion material into the protective sleeve 1, which is fitted over the anchor rod or anchor cable 2, through a detachable sealing device. The sealing device is then removed and the sleeve opening 101 on the protective sleeve 1 is sealed. This satisfies the anti-corrosion requirements without affecting the subsequent overall lowering and installation of the rod. This invention has a simple structure, is safe and reliable, and effectively shortens the construction period and reduces the project cost.

[0056] In this invention, terms such as "upper," "lower," "bottom," and "top" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are merely used to facilitate the description of the structural relationships of the various components or elements of this invention and do not specifically refer to any particular component or element in this invention, nor should they be construed as limiting the invention. Terms such as "connected" and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of the above terms in this invention based on the specific circumstances, and they should not be construed as limiting the invention.

[0057] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A method for corrosion protection of the free section of a prestressed anchor bolt / anchor cable, characterized in that, An assembly for corrosion protection of the free section of prestressed anchor bolts / cables includes a protective sleeve fitted over the surface of the anchor bolt or cable, with at least one sleeve opening on its surface. The protective sleeve is equipped with a detachable sealing device. The sealing device includes a grouting hole, the position of which corresponds to the position of the sleeve opening. The grouting hole is connected to one end of a pressure pipe, and the other end of the pressure pipe is connected to a pressure pump. The sealing device includes an upper sealing cover, a lower sealing cover, connecting bolts, and connecting nuts. A threaded sleeve is provided on one side of the upper and lower sealing covers. One side is provided with corresponding connecting lugs; the threaded sleeve is provided with an internal thread that matches the connecting bolt; the sealing upper cover and sealing lower cover are connected by connecting bolts on the side with the threaded sleeve, and the sealing upper cover and sealing lower cover are connected by connecting nuts on the side with the connecting lugs; the inner wall of the sealing upper cover is also provided with a 1-2mm thick guide groove corresponding to the opening of the sleeve; there is a gap between the protective sleeve and the anchor rod or anchor cable, and anti-corrosion material is injected into the gap through a pressure pipe and a pressure pump; the anti-corrosion method specifically includes the following steps: S1. Before installing the protective sleeve, Apply lubricating grease to the outer surface of the free section of the prestressed anchor rod or cable; then, select a protective sleeve with an inner diameter 3-4 mm larger than the outer diameter of the anchor rod or cable and install it on the surface of the anchor rod or cable, without sealing both ends of the protective sleeve; S2. Protective sleeve opening: Based on the actual length of the protective sleeve, open one or more 5-10 mm sleeve openings on the surface of the protective sleeve for injecting anti-corrosion material; S3. Sealing device installation: Install the upper and lower sealing caps onto the sleeve opening positions of the protective sleeve using connecting bolts and nuts, and align the positions of the grouting hole and the guide groove with the sleeve opening positions; The inner diameter of the sealing device is 1-2mm smaller than the outer diameter of the protective sleeve; S4. Install the pressurizing device. Connect one end of the pressurizing pipe to the grouting hole and the other end to the pressurizing pump; S5. Inject the anti-corrosion material. Turn on the pressurizing pump and inject the anti-corrosion material into the protective sleeve. When the anti-corrosion material overflows from the openings at both ends of the protective sleeve, seal the openings at both ends of the protective sleeve using a hot melt method or wire binding; S6. Remove the sealing device. After sealing both ends of the protective sleeve, remove the sealing device and ensure that the opening side of the sleeve faces upward. After standing for 5 minutes, seal the opening of the sleeve using any one of the following methods: plastic wrap, rubber sleeve, waterproof tape, or sealant.

2. The corrosion protection method for the free section of a prestressed anchor bolt / anchor cable according to claim 1, characterized in that, Both the upper and lower sealing covers are semi-cylindrical tubular structures, and the sealing device is made of steel or plastic.

3. The corrosion protection method for the free section of a prestressed anchor bolt / anchor cable according to claim 1, characterized in that, The corrosion-resistant material is made of fluid or semi-fluid corrosion-resistant material.

4. The corrosion protection method for the free section of a prestressed anchor bolt / anchor cable according to claim 1, characterized in that, The number and spacing of the openings in the sleeve are set according to the actual length of the protective sleeve.

5. The corrosion protection method for the free section of a prestressed anchor bolt / anchor cable according to claim 1, characterized in that, The pressurization tube is made of a metal tube with threads at both ends.

6. The corrosion protection method for the free section of a prestressed anchor bolt / anchor cable according to claim 1, characterized in that, The protective sleeve is made of plastic tubing.

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