Multi-layer anti-corrosion non-prestressed anchor rod with double-layer corrugated sleeve

Abstract

The invention provides a multi-layer anti-corrosion non-prestressed anchor rod with a double-layer corrugated sleeve. The double-layer plastic corrugated sleeve is arranged on the periphery of an anchor rod body. The space between the inner-layer corrugated casing pipe and the anchor rod body and the space between the inner-layer corrugated casing pipe and the outer-layer corrugated casing pipe are filled with cement paste solidified bodies, and a centering support is arranged between the outer-layer corrugated casing pipe and the hole wall of the anchor rod and is filled with the cement paste solidified bodies; an anti-corrosion cap is arranged at the rear end of the outer-layer corrugated sleeve, a sealing ring is arranged between the anti-corrosion cap and the outer-layer corrugated sleeve, and a rear heat shrinkage sleeve is further sleeved outside the joint of the anti-corrosion cap and the outer-layer corrugated sleeve; the front end of the corrugated sleeve and an anchor rod body protruding out of the corrugated sleeve in the anchor rod hole are wrapped by the extension sleeve, and the corrugated sleeve and the extension sleeve are sealed through the sealing ring, so that the integrity of the anchor rod body is sealed. Multi-layer corrosion prevention of the non-prestressed anchor rod is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to a multi-layer corrosion-proof non-prestressed anchor rod with double-layer corrugated sleeve, which is mainly applicable to underground engineering, foundation pit engineering, retaining wall engineering and slope engineering in medium or strong corrosive strata. BACKGROUND

[0002] The non-prestressed anchor rod is a rigid rod-shaped component passively bearing tensile force, which is fixed in the strata by drilling a hole, and the anchor rod passively bears force when the surrounding rock deforms, so as to achieve the purpose of stabilizing the reinforced body and limiting its deformation. The non-prestressed anchor rod is composed of an anchor head, a rod body and accessories. With the development of anchoring technology, the reliability and durability of the anchor rod are required to be higher and higher, and more and more precise, especially for permanent buildings, permanent protection anchor rods are required, and the corrosion of the anchor rod in corrosive strata needs special design to ensure the durability of the anchor rod. The anchor rod is buried in the strata, and when the soil or underground water is corrosive, corrosion is easy to occur. The corrosion of the anchor rod body is the biggest threat factor affecting the service life of the anchor rod. Accidents of anchor rod damage caused by improper design and construction of corrosion protection structure occur from time to time at home and abroad. SUMMARY

[0003] The purpose of the present application is to provide a multi-layer corrosion-proof non-prestressed anchor rod with double-layer corrugated sleeve, so as to improve the corrosion resistance of the non-prestressed anchor rod. The technical solution adopted by the present application is as follows: A multi-layer corrosion-proof non-prestressed anchor rod with double-layer corrugated sleeve, comprising a non-prestressed rigid anchor rod body, characterized in that the front end of the rigid anchor rod body is connected and fixed with the hole orifice of the anchor rod hole by a nut and a fastening structure capable of adjusting the angle of the anchor rod hole orifice. The nut support structure capable of adjusting the angle of the anchor rod hole orifice comprises a middle arched support plate and a hemispherical washer. The arched part of the support plate is provided with a spherical support hole matched with the hemispherical washer, so that the hemispherical washer can be rotated to adjust the included angle with the hole orifice of the anchor rod hole. The rear end of the hemispherical washer is provided with an extension sleeve coaxial with the hemispherical washer. The periphery of the support plate is arranged to be matched with the hole orifice of the anchor rod hole. A double-layer plastic corrugated sleeve is arranged on the periphery of the anchor rod body. The inner layer corrugated sleeve and the anchor rod body, and the inner layer corrugated sleeve and the outer layer corrugated sleeve are filled with cement slurry solidification. The outer layer corrugated sleeve and the wall of the anchor rod hole are provided with a centering support and filled with cement slurry solidification. The rear end of the outer layer corrugated sleeve is provided with a corrosion-proof cap. A sealing ring is arranged between the corrosion-proof cap and the outer layer corrugated sleeve. A rear heat shrinkage sleeve is further sleeved outside the connection between the corrosion-proof cap and the outer layer corrugated sleeve. The front end of the corrugated sleeve and the anchor rod body protruding outside the corrugated sleeve in the anchor rod hole are wrapped by the extension sleeve. The corrugated sleeve and the extension sleeve are closed by a sealing ring, so as to realize the closed integrity of the anchor rod body.

[0004] Based on the above-described technical solutions of this invention, the present invention may also employ the following further technical solutions, or combine these further technical solutions: The anchor head components of the anchor bolts are all coated with galvanized or epoxy anti-corrosion coatings, and the outside of the anchor head is sealed with concrete, providing an additional layer of anti-corrosion for the anchor head.

[0005] The anchor rod body is composed of several rod segments connected together, and adjacent rod segments are connected by connectors, which allows the anchor rod to be further lengthened.

[0006] A grouting pipe and a return grouting pipe are provided between the outer corrugated sleeve and the wall of the anchor bolt hole. The space between the inner corrugated sleeve and the anchor bolt body, or the space connected to it, is also connected to the return grouting pipe and the grouting inlet pipe.

[0007] The support plate and hemispherical gasket are galvanized or epoxy-coated for corrosion protection. The periphery of the support plate can be designed with different inclination angles, and the different sides of the arched part can be set with different lengths and slopes. The periphery of the support plate forms a support foot, while the arched part forms an inclined support leg. The support foot mates with the support surface of the anchor bolt hole opening. The support leg has an opening for the grouting pipe and return grout pipe to pass through.

[0008] The outer corrugated sleeve and the anchor rod body are filled with cement grout solidified in the factory or on site to form a double-layer plastic corrugated sleeve and rigid anchor rod prefabrication body.

[0009] An isolation frame is provided between the inner corrugated sleeve and the anchor rod body, and between the inner and outer corrugated sleeves; the space between the two layers of plastic corrugated sleeves and the space between the inner corrugated sleeve and the anchor rod body are connected to a common grout return pipe; the front end of the outer corrugated sleeve is longer than the inner corrugated sleeve, and the inlet of the common grout return pipe is located within the portion of the outer corrugated sleeve that is longer than the inner corrugated sleeve.

[0010] Because of the technical solution of this invention, it can be applied to non-prestressed anchor bolts, achieving multi-layer corrosion protection for them. Furthermore, it provides multiple protective functions for prefabricated multi-layer corrosion-resistant non-prestressed anchor bolts. This invention also ensures that the anchor bolt is positioned appropriately within the anchor bolt hole and is stably fixed to the hole opening, thus guaranteeing and improving the construction quality of the anchor bolt. Attached Figure Description

[0011] Figure 1 This is a structural schematic diagram of an embodiment of the present invention.

[0012] Figure 2 This is a schematic diagram of the AA cross-sectional structure of an embodiment of the present invention. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] like Figure 1 As shown, the multi-layer anti-corrosion non-prestressed anchor rod with double-layer corrugated sleeve provided by the present invention includes a non-prestressed anchor rod body. The front end of the anchor rod body is connected and fixed to the opening of the anchor rod hole by a nut 304 and a nut support structure that can adjust the angle with the opening of the anchor rod hole 102.

[0015] The adjustable nut support structure with an adjustable angle to the anchor hole opening includes a support plate 305 with a central arch and a hemispherical washer 303. The arched part of the support plate is provided with a spherical support hole 3051 that mates with the hemispherical washer, allowing the hemispherical washer 305 to rotate and adjust the angle with the anchor hole opening. The rear end of the hemispherical washer 303 is provided with an extension sleeve 3031 that is co-centered with the hemispherical washer 303. The periphery of the support plate 305 is configured to mate with the anchor hole opening.

[0016] A double-layered corrugated plastic sleeve is installed around the anchor rod body. This sleeve not only provides corrosion protection but also sufficient anchoring friction. Furthermore, if prefabricated, the outer corrugated sleeve 506 also protects the integrity of the internal corrosion protection structure. The space between the inner corrugated sleeve 505 and the anchor rod body is filled with cement grout solidified material 202, and a spacer 603 ensures the thickness of the cement grout solidified material, providing support and centering. The space between the outer corrugated sleeve 506 and the anchor hole wall is provided with a centering bracket 601 and filled with cement grout solidified material 204, ensuring the thickness of the cement grout outside the sleeve, providing support and centering, preventing displacement of the anchor rod structure during grouting, which could lead to uneven corrosion protection, and improving the corrosion protection effect and overall mechanical properties. A spacer 602 is installed between the inner corrugated sleeve 505 and the outer corrugated sleeve 506 and filled with cement grout solidified material 203.

[0017] The centering bracket 601 and the isolation frames 602 and 603 each include a main ring and uniformly toothed support protrusions of equal height evenly arranged on the main ring along the circumferential direction. The main rings of the centering bracket 601 and the isolation frames 602 and 603 are respectively matched with the outer diameter of the corrugated sleeve 506, the diameter of the corrugated sleeve 505, and the diameter of the anchor rod.

[0018] The outer corrugated sleeve 506 has a corrosion-resistant cap 509 at its rear end. A sealing ring 507 is provided between the corrosion-resistant cap 509 and the outer corrugated sleeve 506. A rear heat-shrinkable sleeve 510 is also fitted over the connection between the corrosion-resistant cap 509 and the outer corrugated sleeve 506. The front ends of the inner corrugated sleeve 505 and the outer corrugated sleeve 506, as well as the anchor rod body protruding from the corrugated sleeve 502 in the anchor bolt hole, are wrapped by the extension sleeve 3031. The corrugated sleeve 506 and the extension sleeve 3031 are sealed with a sealing ring 502 to achieve the sealing of the anchor rod body integrity.

[0019] The support plate 305 can be designed with different angle specifications to achieve a close fit with the shotcrete surface 205 of the anchor bolt hole opening. The centerline of the spherical support hole 3051 should be aligned as closely as possible with the centerline of the anchor bolt hole 101. Subsequent adjustments to the hemispherical washer 303 are then sufficient for compensation. For example, the periphery of the support plate can be designed with different inclination angles, and different sides of the arched portion can be set with different lengths and slopes. The periphery of the support plate forms the support foot 3053, while the arched portion forms the inclined support leg 3052. The support foot 3053 mates with the support surface (shotcrete surface 205) of the anchor bolt hole opening. The support leg 3052 has an opening for the grouting pipe and return grout pipe to pass through. If the cement grout within the corrugated sleeve 506 is injected on-site, the hemispherical washer 303 can also have an opening for the grouting pipe and return grout pipe to pass through, with the inner end of the opening located within the range of the extension sleeve 3031.

[0020] All anchor head metal components, including nuts 304, support plates 305, and hemispherical washers 303, are galvanized or epoxy-coated at the factory. The outer side of the anchor head is sealed with concrete 201, providing an additional layer of corrosion protection.

[0021] The anchor bolt body is composed of two sections 301 and 302 connected together. Adjacent sections are connected by a connector 701, allowing for further lengthening of the anchor bolt. The connector 701 is a metal connecting sleeve. The connecting ends of the two sections 301 and 302 are threaded 702 and threaded into the connector 701. For the grouting of the space between the outer corrugated pipe 506 and the borehole 102, this embodiment uses on-site grouting; for the grouting of the space between the outer corrugated sleeve 506 and the anchor rod 301 / 302, it can be on-site grouting or factory grouting.

[0022] When all grouting is done on-site, the grouting between the outer corrugated sleeve 506 and the anchor hole wall is achieved through the grout inlet pipe 402 and the grout return pipe 403. The grout inlet pipe 402 and the grout return pipe 403 pass through the openings on the support leg 3052 and enter the space between the outer corrugated sleeve 506 and the anchor hole wall. The outlet of the grout inlet pipe 402 is located at the inner end of the anchor hole, and the inlet of the grout return pipe 403 is close to the outer end of the anchor hole. The space between the inner corrugated sleeve 505 and the anchor rod body is connected to the space through which the grout inlet pipe 401 and the grout return pipe 404 are connected. In this embodiment, the grout 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 anti-corrosion cap 506. The grout inlet pipe 401 serves as a common grouting pipe for the space between the inner corrugated sleeve 505 and the anchor rod body, as well as the space between the inner corrugated sleeve 505 and the outer corrugated sleeve 506. The grout return pipe 404 serves as a common grout return pipe for the space between the inner corrugated sleeve 505 and the anchor rod body, as well as the space between the inner corrugated sleeve 505 and the outer corrugated sleeve 506. The front end of the outer corrugated sleeve 506 is longer than that of the inner corrugated sleeve 505, and the inlet of the grout return pipe 404 is located within the portion of the outer corrugated sleeve 506 that is longer than that of the inner corrugated sleeve 506. The hemispherical washer 303 is provided with through holes for the grout inlet pipe 401 and the grout return pipe 404.

[0023] The multi-layer anti-corrosion is achieved through the solidified cement slurry layers, the inner corrugated sleeve 505, the outer side corrugated sleeve 506, and the closed structure at both ends, combined with the centering structure in the anchor rod and the angle adjustment support and fastening of the anchor head.

[0024] The implementation steps of this embodiment are as follows: the anchor rod is prefabricated in the factory and transported to the site. After drilling and cleaning the hole, the above anchor rod structure (excluding cement grout) is assembled and placed into the anchor rod hole 101. The anchor rod is then connected and fixed to the anchor rod hole opening with the nut 304 and the nut support structure that can adjust the angle with the opening of the anchor rod hole 101.

[0025] Pure cement slurry is injected through the slurry inlet pipe 401, and air is released through the internal slurry return pipe 404. Grouting is stopped once the slurry returns steadily to the upper end of the internal slurry return pipe 404.

[0026] Similarly, pure cement slurry is injected through the slurry inlet pipe 402 and air is released through the slurry return pipe 403. Grouting is stopped once the slurry returns steadily to the upper end of the external slurry return pipe 403.

[0027] Once the grout has reached the specified strength, tighten nut 304 to lock the anchor head in place, and apply anti-corrosion coating to the rod body 301. Finally, seal the anchor head with protective concrete 201.

[0028] The grout inlet and return pipes described in this embodiment and the accompanying drawings correspond to the case where the anchor bolt hole is a downward-facing hole. For upward-facing holes, the functions of the grout inlet and return pipes are reversed accordingly, that is, the grout inlet pipe of the downward-facing hole becomes the grout return pipe of the upward-facing hole, and the grout return pipe of the downward-facing hole becomes the grout inlet pipe of the upward-facing hole.

[0029] The above description is merely a specific implementation example of the invention. The technical features of the invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the invention are covered by the protection scope of the invention.

Claims

1. A multi-layered corrosion resistant non-prestressed anchor rod with double corrugated sleeve, comprising a non-prestressed rigid anchor rod body, characterized in that, The front end of the rigid anchor rod body is connected with the anchor hole orifice by a nut and a fastening structure capable of adjusting the angle of the anchor hole orifice; The nut support structure capable of adjusting the angle of the anchor hole orifice comprises a middle arched support plate and a hemispherical washer, the arched part of the support plate is provided with a spherical support hole matched with the hemispherical washer, the hemispherical washer can be rotated to adjust the included angle with the anchor hole orifice, the rear end of the hemispherical washer is provided with an extension sleeve coaxial with the hemispherical washer, and the periphery of the support plate is matched with the anchor hole orifice. A double-layer plastic corrugated sleeve is arranged on the periphery of the anchor rod body, cement slurry solidifying bodies are filled between the inner corrugated sleeve and the anchor rod body and between the inner corrugated sleeve and the outer corrugated sleeve, a centering support is arranged between the outer corrugated sleeve and the wall of the anchor hole and filled with a cement slurry solidifying body, a corrosion-proof cap is arranged at the rear end of the outer corrugated sleeve, a sealing ring is arranged between the corrosion-proof cap and the outer corrugated sleeve, a rear heat shrinkage sleeve is further sleeved at the connection between the corrosion-proof cap and the outer corrugated sleeve, the front end of the corrugated sleeve and the anchor rod body protruding outside the corrugated sleeve in the anchor hole are wrapped by the extension sleeve, and the corrugated sleeve and the extension sleeve are closed by a sealing ring, so that the integrity of the anchor rod body is closed.

2. A multi-layered corrosion protected non-prestressed anchor rod with double-layered corrugated casing as claimed in claim 1, characterized in that, The anchor head member of the anchor rod is provided with a zinc plating or epoxy anticorrosive coating, and the outer side of the anchor head is closed by concrete, thereby providing an additional anticorrosive layer for the anchor head.

3. A multi-layered corrosion protected non-prestressed anchor rod with double-layered corrugated casing as claimed in claim 1, characterized in that, The anchor rod body is composed of a plurality of rod bodies connected by connectors, so that the anchor rod can be further lengthened.

4. A multi-layered corrosion protected non-prestressed anchor rod with double-layered corrugated casing as claimed in claim 1, characterized in that, A grouting pipe and a back grouting pipe are arranged between the outer corrugated sleeve and the wall of the anchor hole, and the space between the inner corrugated sleeve and the anchor rod body or the space connected thereto is also connected with the back grouting pipe and the grouting pipe.

5. A multi-layered corrosion protected non-prestressed anchor rod with double corrugated sleeve as claimed in claim 2, wherein: The support plate and the hemispherical washer are provided with zinc plating or epoxy anticorrosive coating, the periphery of the support plate can be designed to have different inclination angles, different sides of the arched part can be designed to have different lengths and inclinations, the periphery of the support plate forms a support leg, the arched part forms an inclined support leg, the support leg is matched with the support surface of the anchor hole orifice, the support leg is provided with an opening through which the grouting pipe and the back grouting pipe pass.

6. A multi-layered corrosion protected non-prestressed anchor rod with double corrugated sleeve as claimed in claim 1, wherein, The space between the outer corrugated sleeve and the anchor rod body is filled with a cement slurry solidifying body to form a double-layer plastic corrugated sleeve and a rigid anchor rod body prefabricated body.

7. A multi-layered corrosion protected non-prestressed anchor rod with double corrugated sleeve as claimed in claim 1, wherein, A partition frame is arranged between the inner corrugated sleeve and the anchor rod body and between the inner corrugated sleeve and the outer corrugated sleeve, the space between the two plastic corrugated sleeves and the space between the inner corrugated sleeve and the anchor rod body are connected with a common back grouting pipe, the front end of the outer corrugated sleeve is longer than the inner corrugated sleeve, and the inlet of the common back grouting pipe is located in the part of the outer corrugated sleeve longer than the inner corrugated sleeve.

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