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

Abstract

The utility model 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. According to the utility model, multi-layer corrosion prevention of the non-prestressed anchor rod is realized.

Description

Technical Field

[0001] The utility model relates to a multi-layer anti-corrosion non-prestressed anchor rod with a double-layer corrugated sleeve, which is mainly applicable to underground engineering, foundation pit engineering, retaining wall engineering and slope engineering for reinforcing medium or strongly corrosive strata. Background Art

[0002] A non-prestressed anchor rod is a rigid rod-shaped member that passively bears tension. It fixes the stress-bearing tendon in the stratum through drilling. When the surrounding rock deforms, the anchor rod will be stressed passively, so as to achieve the purpose of stabilizing the reinforced body and restricting its deformation. The non-prestressed anchor rod consists of an anchor head, a tendon 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 protective 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 of anchor rod failure 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 main purpose of the utility model is to provide a multi-layer anti-corrosion non-prestressed anchor rod with a double-layer corrugated sleeve, so as to improve the anti-corrosion performance of the non-prestressed anchor rod. The technical solution adopted by the utility model is as follows:

[0004] A multi-layer anti-corrosion non-prestressed anchor rod with a double-layer corrugated sleeve, including 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 orifice of the anchor rod hole by a nut and a fastening structure support structure that can adjust the angle with the orifice of the anchor rod hole;

[0005] The nut support structure that can adjust the angle with the orifice of the anchor rod hole includes a middle-arched support plate and a hemispherical washer. A spherical support hole for cooperating with the hemispherical washer is arranged at the arched part of the support plate, so that the hemispherical washer can rotate to adjust the included angle with the orifice of the anchor rod hole. An extension sleeve coaxial with the hemispherical washer is arranged at the rear end of the hemispherical washer; the periphery of the support plate is arranged to be able to cooperate with the orifice of the anchor rod hole;

[0006] A double-layer plastic corrugated casing is provided around the outer periphery of the anchor rod; the space between the inner corrugated casing and the anchor rod body and the space between the inner corrugated casing and the outer corrugated casing are filled with cement slurry solid; a centering support is arranged between the outer corrugated casing and the anchor hole wall and filled with cement slurry solid; an anti-corrosion cap is provided at the rear end of the outer corrugated casing, a sealing ring is arranged between the anti-corrosion cap and the outer corrugated casing, and a post-heat shrinkage sleeve is also sleeved outside the connection between the anti-corrosion cap and the outer corrugated casing; the front end of the corrugated casing and the anchor rod body protruding outside the corrugated casing in the anchor hole are wrapped by the extension casing, and the space between the corrugated casing and the extension casing is sealed by a sealing ring to achieve the sealing of the integrity of the anchor rod body.

[0007] On the basis of adopting the above technical solutions of the present utility model, the present utility model can also adopt the following further technical solutions, or use these further technical solutions in combination:

[0008] All the anchor head components of the anchor rod adopt 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.

[0009] The anchor rod body is composed of several sections of rod bodies connected together, and the adjacent sections of rod bodies are connected by a connector, so that the anchor rod can be further lengthened.

[0010] A grouting pipe and a return slurry pipe are arranged between the outer corrugated casing and the anchor hole wall, and the space between the inner corrugated casing and the anchor rod body or the space communicated with it is also connected with the return slurry pipe and the grouting pipe.

[0011] The support plate and the hemispherical washer adopt galvanized or epoxy anti-corrosion. The periphery of the support plate can be designed with different inclination angles, different sides of the arched part can be set with different lengths and slopes, the periphery of the support plate forms support feet, and the arched part forms inclined support legs. The support feet cooperate with the support surface of the anchor hole orifice, and the support legs are provided with openings for the grouting pipe and the return slurry pipe to pass through.

[0012] The space between the outer corrugated casing and the anchor rod body is filled with cement slurry solid by factory pre-grouting or on-site grouting to form a double-layer plastic corrugated casing and a rigid anchor rod body prefabricated body.

[0013] An isolation frame is arranged between the inner corrugated casing and the anchor rod body and between the inner and outer corrugated casings; the space between the two layers of plastic corrugated casings and the space between the inner corrugated casing and the anchor rod body are connected to a common return slurry pipe; the front end of the outer corrugated casing is longer than the inner corrugated casing, and the inlet of the common return slurry pipe is located within the part where the outer corrugated casing is longer than the inner corrugated casing.

[0014] Due to the adoption of the technical solution of the present utility model, the present utility model can be applied to non-prestressed anchor rods, realizing multi-layer anti-corrosion of non-prestressed anchor rods, and for prefabricated multi-layer anti-corrosion non-prestressed anchor rods, it can have multiple protection effects. The present utility model can also realize and ensure that the anchor rod can be located at a reasonable position in the anchor rod hole and be fixed stably with the hole opening, ensuring and improving the construction quality of the anchor rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of an embodiment of the present utility model.

[0016] Figure 2 is a schematic cross-sectional structural diagram of A-A of an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The present utility model will be further described below with reference to the drawings.

[0018] As Figure 1 shown, the multi-layer anti-corrosion non-prestressed anchor rod with a double-layer corrugated sleeve provided by the present utility model includes a non-prestressed anchor rod body, and the front end of the anchor rod body is connected and fixed to the hole opening of the anchor rod hole by a nut 304 and a nut support structure that can adjust the angle with the hole opening of the anchor rod hole 102.

[0019] The nut support structure that can adjust the angle with the hole opening of the anchor rod hole includes a middle-arched support plate 305 and a hemispherical washer 303. A spherical support hole 3051 that cooperates with the hemispherical washer is provided at the arched part of the support plate, so that the hemispherical washer 305 can rotate to adjust the included angle with the hole opening of the anchor rod hole. An extension sleeve 3031 that is coaxial with the hemispherical washer 303 is provided at the rear end of the hemispherical washer 303; the periphery of the support plate 305 is arranged to be able to cooperate with the hole opening of the anchor rod hole.

[0020] A double-layer plastic corrugated sleeve is provided on the outer periphery of the anchor rod body; the plastic corrugated sleeve not only has an anti-corrosion function but also can provide sufficient anchoring friction, and moreover, if it is manufactured in a prefabricated manner, the outer corrugated sleeve 506 also has a protection function for the integrity of the internal anti-corrosion structure. The space between the inner corrugated sleeve 505 and the anchor rod body is filled with a cement slurry solid 202, and a spacer 603 is used to ensure the thickness of the cement slurry solid, playing a supporting and centering function; a centering bracket 601 is provided between the outer corrugated sleeve 506 and the anchor rod hole wall and filled with a cement slurry solid 204 to ensure the thickness of the cement slurry outside the sleeve, playing a supporting and centering function, avoiding the displacement of the anchor rod structure during the grouting process, resulting in non-uniformity of the anti-corrosion protection structure, and improving the anti-corrosion protection effect and the overall mechanical properties. A spacer 602 is provided between the inner corrugated sleeve 505 and the outer corrugated sleeve 506 and filled with a cement slurry solid 203.

[0021] The centering bracket 601 and the spacer brackets 602, 603 both include a main body ring and equally high supporting protrusions that are uniformly arranged in a toothed manner along the circumferential direction on the main body ring. The main body rings of the centering bracket 601 and the spacer brackets 602, 603 respectively match the outer diameter of the corrugated sleeve 506, and the diameters of the corrugated sleeve 505 and the anchor rod body.

[0022] An anticorrosion cap 509 is provided at the rear end of the outer corrugated sleeve 506. A sealing ring 507 is arranged between the anticorrosion cap 509 and the outer corrugated sleeve 506. A rear heat shrinkable sleeve 510 is also sleeved outside the connection part between the anticorrosion cap 509 and the outer corrugated sleeve 506; the front ends of the inner corrugated sleeve 505 and the outer corrugated sleeve 506 and the anchor rod body protruding outside the corrugated sleeve 502 in the anchor hole are wrapped by the extension sleeve 3031. The space between the corrugated sleeve 506 and the extension sleeve 3031 is sealed by a sealing ring 502 to achieve the sealing of the integrity of the anchor rod body.

[0023] The support plate 305 can be designed with different angle specifications. On the basis of being fitted to the shotcrete surface 205 at the orifice of the anchor hole, the center line of the spherical support hole 3051 is adjusted to be as consistent as possible with the center line of the anchor hole 101. Subsequently, only a small adjustment of the hemispherical washer 303 is required for compensation. For example, the periphery of the support plate can be designed with different inclination angles, different sides of the arched part can be set with different lengths and slopes. The periphery of the support plate constitutes the support feet 3053, and the arched part constitutes the inclined support legs 3052. The support feet 3053 cooperate with the support surface (shotcrete surface 205) at the orifice of the anchor hole. The support legs 3052 are provided with openings for the grouting pipe and the return grouting pipe to pass through. If the cement slurry inside the corrugated sleeve 506 is grouted on-site, the hemispherical washer 303 can also be provided with holes for the grouting pipe and the return grouting pipe to pass through, and the inner end of the hole is within the range of the extension sleeve 3031.

[0024] All the metal components of the anchor head such as the nut 304, the support plate 305, and the hemispherical washer 303 are galvanized or coated with epoxy in the factory. The outside of the anchor head is sealed with concrete 201, providing an additional layer of anti-corrosion for the anchor head.

[0025] The anchor rod body is composed of two rod bodies 301, 302 connected together. 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 connecting sleeve. The connecting ends of the two rod bodies 301, 302 are threaded 702 and are threadedly connected to the connector 701.

[0026] For the grouting of the space between the outer corrugated pipe 506 and the drilling hole 102, in this embodiment, it is grouted on-site; for the grouting of the space between the outer corrugated sleeve 506 and the anchor rod body 301 / 302, it can be grouted on-site or in the factory.

[0027] When all are on-site grouting, the grouting between the outer corrugated sleeve 506 and the hole wall of the anchor hole 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 hole wall of the anchor hole. Among them, 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 connected space by a grout inlet pipe 401 and a grout return pipe 404. 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 the 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 corrugated sleeve 506. The grout return pipe 404 serves as the common grout 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 corrugated sleeve 506. The front end of the outer corrugated sleeve 506 is longer than the inner corrugated sleeve 505, and the inlet of the grout return pipe 404 is located within the part where the outer corrugated sleeve 506 is longer than the inner corrugated sleeve 5005. The hemispherical washer 303 is provided with through holes for the grout inlet pipe 401 and the grout return pipe 404.

[0028] The multi-layer anti-corrosion is realized through the solidified bodies of each layer of cement slurry, the inner corrugated sleeve 505, the outer side corrugated sleeve 506, the closed structures at both ends, combined with the centering structure in the anchor rod and the angle adjustment support and fastening at the anchor head part.

[0029] The implementation steps of this embodiment are as follows: The anchor rod is prefabricated in the factory and transported to the site. After the drilling and hole cleaning are completed on-site, the above anchor rod structure (except for the cement slurry body) is assembled and placed into the anchor hole 101, and is connected and fixed to the anchor hole opening with the nut 304 and the nut support structure that can adjust the angle with the hole opening of the anchor hole 101.

[0030] Use the grout inlet pipe 401 to inject pure cement slurry, and the internal grout return pipe 404 discharges air. Stop grouting after the upper end orifice of the internal grout return pipe 404 stably returns grout.

[0031] Similarly, use the grout inlet pipe 402 to inject pure cement slurry, and the grout return pipe 403 discharges air. Stop grouting after the upper end orifice of the external grout return pipe 403 stably returns grout.

[0032] When the grouting slurry reaches the specified strength, continue to tighten the nut 304 to lock the anchor head, and apply anti-corrosion coating to the part of the rod body 301. Finally, close the anchor head with the protective concrete 201.

[0033] The description of this embodiment and the inlet and return slurry pipes in the accompanying drawings correspond to the case where the anchor hole is a downward hole. For the upward hole, the functions of the inlet and return slurry pipes are correspondingly swapped, that is, the inlet slurry pipe of the downward hole serves as the return slurry pipe of the upward hole, and the return slurry pipe of the downward hole serves as the inlet slurry pipe of the upward hole.

[0034] 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 multi-layer anti-corrosion non-prestressed anchor rod with a 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 to the orifice of the anchor rod hole by a nut and a fastening structure that can adjust the angle with the orifice of the anchor rod hole; The nut support structure that can adjust the angle with the orifice of the anchor rod hole includes a support plate with a middle arch and a hemispherical washer. A spherical support hole that cooperates with the hemispherical washer is provided at the arched part of the support plate, so that the hemispherical washer can rotate to adjust the included angle with the orifice of the anchor rod hole. An extension sleeve coaxial with the hemispherical washer is provided at the rear end of the hemispherical washer; the periphery of the support plate is arranged to cooperate with the orifice of the anchor rod hole; A double-layer plastic corrugated sleeve is provided outside the anchor rod body; the space between the inner corrugated sleeve and the anchor rod body and the space between the inner corrugated sleeve and the outer corrugated sleeve are filled with a cement slurry solid. A centering support is provided between the outer corrugated sleeve and the anchor rod hole wall and filled with a cement slurry solid; an anti-corrosion cap is provided at the rear end of the outer corrugated sleeve. A sealing ring is provided between the anti-corrosion cap and the outer corrugated sleeve, and a post heat shrinkage sleeve is also sleeved outside the connection between the anti-corrosion 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 rod hole are wrapped by the extension sleeve, and the corrugated sleeve and the extension sleeve are sealed with a sealing ring to achieve the integrity sealing of the anchor rod body.

2. The multi-layer anti-corrosion non-prestressed anchor rod with a double-layer corrugated sleeve as described in claim 1, wherein, All the anchor head components of the anchor rod adopt a galvanized or epoxy anti-corrosion coating, and the outside of the anchor head is sealed with concrete, providing an additional layer of anti-corrosion for the anchor head.

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

4. The multi-layer anti-corrosion non-prestressed anchor rod with a double-layer corrugated casing according to claim 1, characterized in that, A grouting pipe and a return slurry pipe are provided between the outer corrugated sleeve and the anchor rod hole wall, and the space between the inner corrugated sleeve and the anchor rod body or the space connected thereto is also connected to the return slurry pipe and the grouting pipe.

5. The multi-layer anti-corrosion non-prestressed anchor rod with a double-layer corrugated sleeve according to claim 2, wherein: The support plate and the hemispherical washer are galvanized or epoxy anti-corrosion. The periphery of the support plate can be designed with different inclination angles, and different sides of the arched part can be set with different lengths and slopes. The periphery of the support plate forms a support foot, and the arched part forms an inclined support leg. The support foot cooperates with the support surface of the orifice of the anchor rod hole, and the support leg is provided with openings for the grouting pipe and the return slurry pipe to pass through.

6. The multi-layer anti-corrosion non-prestressed anchor rod with a double-layer corrugated sleeve according to claim 1, characterized in that, The space between the outer corrugated 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 a double-layer plastic corrugated sleeve and a rigid anchor rod body.

7. A multi-layer anti-corrosion non-prestressed anchor rod with a double-layer corrugated sleeve as described in claim 1, characterized in that, 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 plastic corrugated sleeves and the space between the inner corrugated sleeve and the anchor rod body are connected to a common return slurry pipe; the front end of the outer corrugated sleeve is longer than the inner corrugated sleeve, and the inlet of the common return slurry pipe is located within the part where the outer corrugated sleeve is longer than the inner corrugated sleeve.

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