Double-layer anti-corrosion pre-stressed anchor rod with double-layer sleeve

Abstract

The utility model provides a double-layer anti-corrosion pre-stressed anchor rod with a double-layer sleeve. The double-layer plastic sleeve is arranged on the periphery of an anchor rod body. The inner layer is a corrugated sleeve, cement paste solidification bodies are filled between the inner layer corrugated sleeve and the anchor rod body, the outer layer plastic sleeve is formed by connecting an outer layer corrugated sleeve section and an outer layer light pipe section through a first heat shrinkage sleeve, the outer layer corrugated sleeve section is located on the front side and corresponds to the anchoring section, and the outer layer light pipe section is located on the rear side and corresponds to the free section. The anti-corrosion device can be applied to the pre-stressed anchor rod, double-layer anti-corrosion of the pre-stressed anchor rod is achieved, the prefabricated double-layer anti-corrosion anchor rod can be protected from being damaged in the transportation and installation process through multiple protection effects, and it can be achieved and guaranteed that the anchor rod can be located in a reasonable position in an anchor rod hole and is stably fixed to a hole opening; and the building quality of the anchor rod is ensured and improved. The device can be implemented on site or prefabricated in a factory, the crack width requirement does not need to be controlled, and the reliability is higher.

Description

Technical Field

[0001] The utility model relates to a double-layer anti-corrosion prestressed anchor rod with double-layer sleeves, which is mainly applicable to temporary reinforcement of medium or strongly corrosive strata or underground engineering, foundation pit engineering, retaining wall engineering and slope engineering under the condition of permanent reinforcement Background Art

[0002] A prestressed anchor rod is a rigid rod-shaped member that actively bears tension. It fixes the stress-bearing tendon in the stratum through drilling and applies prestress during the installation stage, so as to achieve the purpose of stabilizing the reinforced body and restricting its deformation. The prestressed anchor rod consists of an anchor head, a free section, an anchorage section and accessories. With the development of anchoring technology, the requirements for the reliability and durability of anchor rods are getting higher and higher, and more and more precise. Especially for permanent buildings, permanent protection anchor rods are required. For anchor rods in corrosive strata, anti-corrosion needs to be specially designed to ensure the durability of the anchor rods. The anchor rod is buried in the stratum. When the soil or groundwater is corrosive, corrosion is likely to occur. The corrosion of the anchor rod body is the biggest threat factor affecting the life of the anchor rod. Accidents caused by corrosion due to improper design and construction of the anti-corrosion protection structure of anchor rods occur frequently at home and abroad. Content of the Utility Model

[0003] The purpose of the utility model is to provide a double-layer anti-corrosion prestressed anchor rod with double-layer sleeves, so as to improve the anti-corrosion performance of the prestressed anchor rod. The technical solution adopted by the utility model is as follows:

[0004] A double-layer anti-corrosion prestressed anchor rod with double-layer sleeves, including an anchor rod body, the anchor rod body includes an anchorage section and a free section, and is characterized in that

[0005] A double-layer plastic sleeve is arranged on the periphery of the anchor rod body; the inner layer is a corrugated sleeve, and the space between the inner corrugated sleeve and the anchor rod body is filled with a cement slurry solid; the outer plastic sleeve is composed of an outer corrugated sleeve section and an outer smooth tube section connected by a first heat shrinkable sleeve. The outer corrugated sleeve section is located at the front side corresponding to the anchorage section, and the outer smooth tube section is located at the rear side corresponding to the free section. A centering support is arranged between the outer plastic sleeve and the hole wall of the anchor rod hole and filled with a cement slurry solid; an anti-corrosion cap is arranged at the rear end of the outer corrugated sleeve section, a sealing ring is arranged between the anti-corrosion cap and the outer corrugated sleeve section, and a second heat shrinkable sleeve is also sleeved outside the connection between the anti-corrosion cap and the outer corrugated sleeve section; an extension sleeve is arranged at the rear side of the bearing plate, the extension sleeve passes through the hole on the concrete base and is inserted into the anchor rod hole, the front end of the outer smooth tube section is inserted into the extension sleeve and a sealing ring is arranged between the two, and the part of the anchor rod body extending out of the outer smooth tube section is protected by the bearing plate, the extension sleeve and the concrete therein. The space between the bearing plate and the hole opening of the anchor rod hole is sealed by an epoxy resin cushion layer;

[0006] The anchor head part includes a nut, a bearing plate, an epoxy resin cushion layer and a concrete base; the bonding force between the prestressed anchor rod and the hole wall of the anchor rod hole corresponding to the outer corrugated sleeve section is the inner end anchoring force. After the anchor rod body is tensioned, its front end is connected and fixed to the orifice of the anchor rod hole with a nut, a bearing plate, an epoxy resin cushion layer and a concrete base.

[0007] An anchor head plastic cap is also provided at the anchor head part. The anchor head plastic cap covers the end of the anchor rod body, the nut and the nut washer of the anchor head, and is filled with a rust inhibitor inside to achieve the enclosure of the integrity of the anchor rod body.

[0008] On the basis of adopting the above technical solutions, the present utility model can also adopt the following further technical solutions, or use these further technical solutions in combination:

[0009] The nut washer includes a hemispherical washer, and the opening of the bearing plate fits the shape of the hemispherical washer; an epoxy resin cushion layer is provided at the bottom of the bearing plate, which together with the concrete base, realizes spatial enclosure to prevent external corrosive substances from invading; a guiding sleeve is also provided for the double-layer anti-corrosion prestressed anchor rod, and the guiding sleeve extends from the through hole on the concrete base into the orifice of the anchor rod hole.

[0010] All the anchor head components of the anchor rod adopt a galvanized or epoxy anti-corrosion coating, which provides an additional layer of anti-corrosion for the anchor head and the front rod body.

[0011] The anchor rod body is composed of several rod body segments connected together, and the adjacent rod body segments are connected by a connector, so that the anchor rod can be further lengthened.

[0012] A grouting pipe and a return slurry pipe are provided between the outer plastic sleeve and the hole wall of the anchor rod hole, and the space between the inner corrugated sleeve and the anchor rod body or the space connected thereto is also connected with a return slurry pipe and a grouting pipe.

[0013] The bearing plate, the hemispherical washer, the guiding pipe and the extension sleeve are anti-corrosion coated with galvanized or epoxy coating. The structure of the concrete base can be designed with different inclination angles. The bottom of the concrete base is a concrete cushion layer or a shotcrete layer. The bearing plate cooperates with the concrete base surface and the epoxy resin coating; the bearing plate and the hemispherical washer are provided with openings for the grouting pipe and the return slurry pipe to pass through.

[0014] The space between the outer plastic sleeve and the anchor rod body is filled with a precast or on-site grouted cement slurry solid to form a double-layer plastic sleeve and an anchor rod body prefabricated body.

[0015] An isolation frame is provided between the inner corrugated sleeve and the anchor rod body, and between the inner corrugated plastic sleeve and the outer plastic sleeve, and the space between the two plastic corrugated sleeves is filled with a cement slurry solid to fill it; a common return pipe is provided in the space between the two plastic sleeves and in the space between the inner corrugated sleeve and the anchor rod body; the front end of the outer smooth pipe section is longer than the inner corrugated sleeve, and the inlet of the common return pipe is located within the part of the outer plastic sleeve that is longer than the inner corrugated sleeve.

[0016] Due to the adoption of the technical solution of the present invention, the present invention can be applied to prestressed anchor rods to achieve double-layer anti-corrosion of prestressed anchor rods. For prefabricated double-layer anti-corrosion anchor rods, it can have multiple protection effects to avoid damage during transportation and installation, and can also achieve and ensure that the anchor rod can be located at a reasonable position in the anchor hole and be fixed stably with the hole mouth, ensuring and improving the construction quality of the anchor rod. The present invention can be implemented on-site or prefabricated in a factory, without the requirement of controlling the crack width, and has a higher reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of an embodiment of the present invention.

[0018] Figure 2 is a schematic cross-sectional structural diagram of A-A of an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] As Figure 1 shown, the double-layer anti-corrosion prestressed anchor rod with double sleeves provided by the present invention includes an anchor rod body, the anchor rod body includes an anchoring section and a tensioning section, and the anchor head part includes a nut 304, a bearing plate 305, an epoxy resin cushion layer 203 and a concrete base 201.

[0021] A double-layer plastic casing is provided around the anchor rod body; the inner layer is a corrugated casing. The space between the inner corrugated casing 505 and the anchor rod body is filled with a cement slurry solid 202. An isolation frame 603 is sleeved on the anchor rod body to ensure the thickness of the cement slurry solid, playing a supporting and centering function. The outer plastic casing is composed of an outer corrugated casing section 509 and an outer smooth tube section 506 connected by a first heat shrinkable sleeve 511. The outer corrugated casing section 509 is located at the front side. The section of the anchor rod body within the outer corrugated casing section 509 is the anchorage section, and the outer smooth tube section 506 is located at the rear side. The section of the anchor rod body within the range of the outer smooth tube section 506 is the free section. A centering support 601 is arranged between the outer plastic casing and the wall of the anchor hole 102, and the space is filled with a cement slurry solid 204 to ensure the thickness of the cement slurry outside the casing, playing a supporting and centering function, avoiding the displacement of the anchor rod structure during grouting, which may lead to the non-uniformity of the anti-corrosion protection structure, and improving the anti-corrosion protection effect and the overall mechanical properties. Among them, the plastic corrugated casing not only has an anti-corrosion function but also can provide sufficient anchoring friction. The smooth plastic casing has an anti-corrosion function and enables the free section rod body to slide freely during tensioning. An anti-corrosion cap 508 is provided at the rear end of the outer corrugated casing section 509. A sealing ring 507 is arranged between the anti-corrosion cap 508 and the outer corrugated casing section 509. A second heat shrinkable sleeve 510 is also sleeved outside the connection between the anti-corrosion cap 508 and the outer corrugated casing section 509. A centering support 602 is arranged between the inner corrugated casing 505 and the outer plastic casing, and the space is filled with a cement slurry solid 205. If it is manufactured in a prefabricated manner, the outer plastic casing also has a protective function for the integrity of the internal anti-corrosion structure.

[0022] The centering support 601 and the isolation frames 602 and 603 both include a main body ring and equally high support protrusions uniformly arranged in a toothed manner along the circumferential direction on the main body ring. The main body rings of the centering support 601 and the isolation frames 602 and 603 respectively match the diameters of the outer plastic casing, the inner plastic corrugated casing, and the anchor rod body.

[0023] An extension casing 802 is arranged at the rear side of the bearing plate 305. The extension casing 802 passes through the hole in the concrete foundation 201 and is inserted into the anchor hole 102. The front end of the outer smooth tube section 509 is inserted into the extension casing 802, and a sealing ring 502 is arranged between them. The part of the anchor rod body extending out of the outer smooth tube section is protected by the extension casing 802 and the concrete inside it. The space between the bearing plate 305 and the orifice of the anchor hole is sealed by an epoxy resin cushion layer 203.

[0024] The bonding force between the section of the prestressed anchor rod corresponding to the outer corrugated casing section 509 and the wall of the anchor hole is the inner end anchoring force. After the anchor rod body is tensioned, its front end is connected and fixed to the orifice of the anchor hole by a nut 304, a bearing plate 305, an epoxy resin cushion layer 203, and a concrete foundation 201.

[0025] An anchor head plastic cap 900 is also provided at the anchor head part. The anchor head plastic cap 900 covers the end of the anchor rod body of the anchor head, the nut 304 and the nut washer 303, and is filled with a rust inhibitor 901 inside to achieve the closure of the integrity of the anchor rod body. The plastic cap 900 can be filled with the rust inhibitor 901 through the opening 902. An epoxy resin cushion layer 203 is provided at the anchor head part to achieve the closure between the bearing plate 305 and the concrete base 201, and the concrete base 201 can be cast into an inclined shape.

[0026] The nut washer 303 can be a hemispherical washer, and the opening 3051 of the bearing plate 305 fits the shape of the hemispherical washer; an epoxy resin cushion layer 203 is provided at the bottom of the bearing plate 305, which, together with the concrete base 201, achieves spatial closure to prevent external corrosive substances from invading.

[0027] The concrete base structure 201 can be designed with different inclination angles to compensate for the inclination angle of the axis of the anchor rod hole at the orifice of the anchor rod, so as to deal with anchor rods with different inclinations and make the anchor rod more stably in a reasonable position. The bearing plate 305 and the hemispherical washer are provided with openings for the grouting pipe or the return slurry pipe to pass through.

[0028] All anchor head metal components such as the nut 304, the bearing plate 305, and the nut washer 303 are galvanized or coated with epoxy in the factory. A guide pipe 801 is also provided at the orifice section to provide a guiding function for the prestressed anchor rod.

[0029] The anchor rod body is composed of two rod bodies 301 and 302 connected (it can also be a single segment or multiple segments of rod bodies connected). The adjacent rod bodies are connected by a connector 701, so that the anchor rod can be further lengthened. The connector 701 is a metal connection sleeve, and the connecting ends of the two rod bodies 301 and 302 are threaded 702 and are threadedly connected to the connector 701.

[0030] The grouting between the outer plastic sleeve and the hole wall of the anchor rod hole is realized through the grouting pipe 402 and the return slurry pipe 403. The grouting pipe 402 and the return slurry pipe 403 pass through the openings on the bearing plate 305 and enter the space between the outer plastic sleeve and the hole wall of the anchor rod hole. Among them, the outlet of the grouting pipe 402 is located at the inner end of the anchor rod hole, and the inlet of the return slurry pipe 403 is close to the outer end of the anchor rod hole.

[0031] A slurry inlet pipe 401 and a slurry return pipe 404 are connected to the space between the inner corrugated sleeve 505 and the anchor rod body and the space communicating therewith. In this embodiment, the slurry inlet pipe 401 extends along the surface of the inner corrugated sleeve 505 to the space between the anchor rod body, the inner end of the inner corrugated sleeve 505 and the anticorrosion cap 508. The slurry inlet pipe 401 serves as a common grouting pipe for the space between the inner corrugated sleeve 505 and the anchor rod body and the space between the inner corrugated sleeve 505 and the outer plastic sleeve. The slurry return pipe 404 serves as a common slurry return pipe for the space between the inner corrugated sleeve 505 and the anchor rod body and the space between the inner corrugated sleeve 505 and the outer plastic sleeve. The front end of the plastic smooth pipe section 506 in the outer plastic sleeve is longer than the inner corrugated sleeve 505, and the inlet of the slurry return pipe 404 is located within the part of the plastic smooth pipe section 506 that is longer than the inner corrugated sleeve 505. For the grouting of the space between the outer plastic sleeve and the anchor hole 102, grouting is carried out on site in this embodiment; for the grouting of the space between the outer plastic sleeve and the anchor rod body, it can be on-site grouting or factory grouting.

[0032] The hemispherical washer is provided with through holes for the slurry inlet pipe 401 and the slurry return pipe 404.

[0033] The double-layer anti-corrosion is realized through the inner corrugated sleeve 505, the outer plastic sleeve, the closed structures at both ends and in the middle, combined with the isolation frame in the anchor rod, the centering right angle and the anti-corrosion kit at the anchor head part.

[0034] The implementation steps of this embodiment are as follows: The anchor rod is transported to the site. After the drilling and hole cleaning are completed on site, the cushion layer 101, the concrete base 201 and the epoxy resin cushion layer 305 are poured. The anchor rod structure (except for the cement slurry) is assembled and placed into the anchor hole 102. Pure cement slurry is injected using the slurry inlet pipe 401, and the internal slurry return pipe 404 discharges air. After the upper end orifice of the internal slurry return pipe 404 stably returns slurry, the grouting is stopped.

[0035] Similarly, pure cement slurry is injected using the slurry inlet pipe 402, and the slurry return pipe 403 discharges air. After the upper end orifice of the external slurry return pipe 403 stably returns slurry, the grouting is stopped.

[0036] When the grouting slurry reaches the specified strength, prestress is applied, and the nut 304 is tightened to lock the anchor head. Finally, the anchor head is sealed through the anchor head plastic cap 900 and the rust inhibitor 901.

[0037] The slurry inlet and return pipes in the description of this embodiment and the attached drawings correspond to the case where the anchor hole is a downward hole. For an upward hole, the functions of the slurry inlet and return pipes are correspondingly reversed, that is, the slurry inlet pipe of the downward hole serves as the slurry return pipe of the upward hole, and the slurry return pipe of the downward hole serves as the slurry inlet pipe of the upward hole.

[0038] The above are only specific implementation cases of the utility model. The technical features of the utility model are not limited thereto. Any changes or modifications made by those skilled in the relevant art within the field of the utility model are covered by the protection scope of the utility model.

Claims

1. A double-layer anti-corrosion prestressed anchor rod with double-layer sleeves, comprising an anchor rod body, the anchor rod body including an anchorage section and a free section, characterized in that the anchor head part includes a nut, a bearing plate, an epoxy resin cushion layer and a concrete base; a double-layer plastic sleeve is arranged on the periphery of the anchor rod body; the inner layer is a corrugated sleeve, and the space between the inner corrugated sleeve and the anchor rod body is filled with a cement slurry solid; the outer plastic sleeve is composed of an outer corrugated sleeve section and an outer smooth tube section connected by a first heat shrinkable sleeve. The outer corrugated sleeve section is located at the front side corresponding to the anchorage section, and the outer smooth tube section is located at the rear side corresponding to the free section. A centering support and a cement slurry solid are arranged between the outer plastic sleeve and the hole wall of the anchor hole; an anti-corrosion cap is arranged at the rear end of the outer corrugated sleeve section, a sealing ring is arranged between the anti-corrosion cap and the outer corrugated sleeve section, and a second heat shrinkable sleeve is also sleeved outside the connection between the anti-corrosion cap and the outer corrugated sleeve section; an extension sleeve is arranged at the rear side of the bearing plate, the extension sleeve passes through the hole on the concrete base and is inserted into the anchor hole, the front end of the outer smooth tube section is inserted into the extension sleeve and a sealing ring is arranged between the two. The part of the anchor rod body extending out of the outer smooth tube section is protected by the bearing plate, the extension sleeve and the concrete inside; the space between the bearing plate and the hole opening of the anchor hole is sealed by the epoxy resin cushion layer; the bonding force between the part of the prestressed anchor rod corresponding to the outer corrugated sleeve section and the hole wall of the anchor hole is the inner end anchoring force. After the anchor rod body is tensioned, its front end is connected and fixed to the hole opening of the anchor hole by the nut, the bearing plate, the epoxy resin cushion layer and the concrete base an anchor head plastic cap is also arranged at the anchor head part. The anchor head plastic cap covers the end of the anchor rod body, the nut and the nut washer of the anchor head, and is filled with a rust inhibitor inside to realize the enclosure of the integrity of the anchor rod body.

2. The double-layer anti-corrosion prestressed anchor rod with double-layer casing as claimed in claim 1, wherein, the nut washer includes a hemispherical washer, and the opening of the bearing plate fits the shape of the hemispherical washer; an epoxy resin cushion layer is arranged at the bottom of the bearing plate, which together with the concrete base realizes space enclosure to prevent external corrosive substances from invading; a guiding sleeve is also arranged on the double-layer anti-corrosion prestressed anchor rod, and the guiding sleeve extends from the through hole on the concrete base to the hole opening of the anchor hole.

3. A double-layer anti-corrosion prestressed anchor rod with a double-layer sleeve as described in claim 1, characterized in that, All the anchor head components of the anchor rod are coated with zinc plating or epoxy anti-corrosion coating, providing an additional layer of anti-corrosion for the anchor head and the front part of the rod body.

4. A double-layer anti-corrosion prestressed anchor rod with a double-layer casing according to claim 1, characterized in that, The anchor rod body is composed of several sections of rod bodies connected together, and the adjacent rod bodies are connected by a connector, so that the anchor rod can be further lengthened.

5. The double-corrosion-proof prestressed anchor rod with a double-layer casing according to claim 1, characterized in that A grouting pipe and a return slurry pipe are arranged between the outer plastic sleeve and the hole wall of the anchor hole, and the space between the inner corrugated sleeve and the anchor rod body or the space communicated with it is also connected with the return slurry pipe and the grouting pipe.

6. The double-corrosion-proof prestressed anchor rod with a double-layer sleeve according to claim 2, characterized in that: The bearing plate, the hemispherical washer, the guiding pipe and the extension sleeve are coated with zinc plating or epoxy coating for anti-corrosion. The structure of the concrete base can be designed with different inclination angles. The bottom of the concrete base is a concrete cushion layer or a shotcrete layer. The bearing plate cooperates with the concrete base surface and the epoxy resin coating; the bearing plate and the hemispherical washer are provided with openings for the grouting pipe and the return slurry pipe to pass through.

7. A double-layer anti-corrosion prestressed anchor rod with a double-layer casing according to claim 1, characterized in that, The space between the outer plastic sleeve and the anchor rod body is filled with a cement slurry solid by factory pre-grouting or on-site grouting to form a prefabricated body of the double-layer plastic sleeve and the anchor rod body.

8. A double-layer anti-corrosion prestressed anchor rod with a double-layer sleeve as described in claim 1, characterized in that, An isolation frame is provided between the inner corrugated casing and the anchor rod body, and between the inner corrugated plastic casing and the outer plastic casing, and the space between the two plastic corrugated casings is filled and solidified with a cement slurry solid; a common return pipe is provided in the space between the two plastic casings and in the space between the inner corrugated casing and the anchor rod body; the front end of the outer smooth pipe section is longer than the inner corrugated casing, and the inlet of the common return pipe is located within the part of the outer plastic casing that is longer than the inner corrugated casing.

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