Double-layer anti-corrosion non-prestressed anchor rod adopting coating and corrugated sleeve

Abstract

The invention provides a double-layer anti-corrosion non-prestressed anchor rod adopting a coating and a corrugated sleeve. The plastic corrugated sleeve is arranged on the periphery of an anchor rod body; an isolating frame is arranged between the plastic corrugated sleeve and the anchor rod body and is filled with a cement paste solidification body; a centering bracket is arranged between the plastic corrugated sleeve and the hole wall of the anchor rod and is filled with the cement paste solidification body; an anti-corrosion cap is arranged at the rear end of the corrugated sleeve, a sealing ring is arranged between the anti-corrosion cap and the corrugated sleeve, and a rear thermal shrinkage sleeve is further sleeved outside the joint of the anti-corrosion cap and the 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. Double-layer corrosion prevention of the non-prestressed anchor rod is achieved, it is guaranteed that the anchor rod can be located in a reasonable position in the anchor rod hole and is stably fixed to the hole opening, and the building quality of the anchor rod is guaranteed and improved.

Description

Technical Field

[0001] This invention relates to a double-layer anti-corrosion non-prestressed anchor bolt with a coating and a corrugated sleeve, which is mainly suitable for underground engineering, foundation pit engineering, retaining wall engineering and slope engineering for the reinforcement of corrosive strata. Background Technology

[0002] Non-prestressed anchor bolts are rigid rod-shaped components that passively bear tensile forces. They are fixed to the ground through drilling, and when the surrounding rock deforms, the anchor bolt passively bears the force, thus stabilizing the reinforced body and limiting its deformation. Non-prestressed anchor bolts consist of an anchor head, reinforcing bars, and accessories. With the development of anchoring technology, the requirements for the reliability and durability of anchor bolts are becoming increasingly stringent and sophisticated. Permanent structures, in particular, require permanently protected anchor bolts. For anchor bolts in corrosive strata, special design is needed to ensure their durability. Anchor bolts buried in the ground are prone to corrosion when the soil or groundwater is corrosive. Corrosion of the anchor bolt body is the greatest threat to its lifespan. Accidents of anchor bolt failure due to corrosion caused by improper design and construction of anti-corrosion protection structures occur frequently both domestically and internationally. Summary of the Invention

[0003] The purpose of this invention is to provide a double-layer anti-corrosion non-prestressed anchor bolt employing a coating and corrugated sleeve, thereby improving the corrosion resistance of non-prestressed anchor bolts. The technical solution adopted by this invention is as follows: A double-layer anti-corrosion non-prestressed anchor bolt using a coating and a corrugated sleeve, comprising a non-prestressed anchor bolt body with an anti-corrosion layer, characterized in that the front end of the anchor bolt body is connected and fixed to the anchor bolt hole opening by a nut and an adjustable nut support structure with an angle relative to the anchor bolt hole opening; The adjustable nut support structure with an adjustable angle to the anchor hole opening includes a support plate with a central arch and a hemispherical washer. The arched part of the support plate is provided with a spherical support hole that mates with the hemispherical washer, allowing the hemispherical washer to rotate and adjust the angle with the anchor hole opening. The rear end of the hemispherical washer is provided with an extension sleeve with the same center line as the hemispherical washer. The periphery of the support plate is configured to mate with the anchor hole opening. A plastic corrugated sleeve is provided around the anchor rod body; an isolation frame is provided between the plastic corrugated sleeve and the anchor rod body and the space is filled with cement grout; a centering bracket is provided between the corrugated sleeve and the anchor hole wall and the space is filled with cement grout; a corrosion-resistant cap is provided at the rear end of the corrugated sleeve, and a sealing ring is provided between the corrosion-resistant cap and the corrugated sleeve; a heat-shrinkable sleeve is also provided at the connection between the corrosion-resistant cap and the corrugated sleeve; the front end of the corrugated sleeve and the anchor rod body protruding from the corrugated sleeve in the anchor hole are wrapped by the extension sleeve, and the corrugated sleeve and the extension sleeve are sealed with a sealing ring to achieve the sealing of the anchor rod body integrity.

[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 corrugated sleeve and the wall of the anchor bolt hole. The space between the 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] Because of the technical solution of this invention, this invention can be applied to non-prestressed anchor bolts, achieving double-layer corrosion protection for non-prestressed anchor bolts. Furthermore, it ensures that the anchor bolt is positioned in a reasonable location within the anchor bolt hole and is stably fixed to the hole opening, thereby guaranteeing and improving the construction quality of the anchor bolt. Attached Figure Description

[0009] Figure 1 This is a structural schematic diagram of an embodiment of the present invention.

[0010] Figure 2 This is a schematic diagram of the AA cross-sectional structure of an embodiment of the present invention. Detailed Implementation

[0011] The invention will now be further described with reference to the accompanying drawings.

[0012] like Figure 1 As shown, the present invention provides a double-layer anti-corrosion non-prestressed anchor rod with coating and corrugated sleeve, including a non-prestressed anchor rod body with galvanized or epoxy anti-corrosion coating, wherein the front end of the anchor rod body is connected and fixed to the anchor rod hole opening by a nut 304 and a nut support structure that can adjust the angle with the anchor rod hole opening.

[0013] 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.

[0014] A plastic corrugated sleeve 502 is installed around the anchor rod body. This sleeve not only provides corrosion protection but also sufficient anchoring friction. The space between the plastic corrugated sleeve 502 and the anchor rod body is filled with cement grout solidified material 202, and a spacer 602 ensures the thickness of the cement grout solidified material, providing support and centering. A centering bracket 601 is installed between the corrugated sleeve 502 and the wall of the anchor rod hole 101, and this spacer is filled with cement grout solidified material 203 to ensure the thickness of the cement grout outside the sleeve, providing support and centering. This prevents displacement of the anchor rod structure during grouting, avoiding unevenness in the corrosion protection structure and improving the corrosion protection effect and overall mechanical properties. Both the centering bracket 601 and the spacer 602 include a main ring and uniformly toothed, level support protrusions arranged circumferentially on the main ring. The main rings of the centering bracket 601 and the spacer 602 are matched to the outer diameter of the corrugated sleeve 502 and the diameter of the anchor rod body, respectively. The corrugated sleeve 502 is provided with a corrosion-resistant cap 506 at its rear end. A sealing ring 505 is provided between the corrosion-resistant cap 506 and the corrugated sleeve 502. A rear heat-shrinkable sleeve 503 is also provided at the connection between the corrosion-resistant cap 506 and the corrugated sleeve 502. The front end of the corrugated sleeve 502 and 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 502 and the extension sleeve 3031 are sealed with a sealing ring 501 to achieve the sealing of the integrity of the anchor rod body.

[0015] The support plate 305 can be designed with different angle specifications to achieve a close fit with the shotcrete surface 204 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 204) 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 between the corrugated sleeve 502 and the anchor bolt body 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.

[0016] 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.

[0017] The anchor bolt body is composed of two sections 301 and 302 connected together. Adjacent sections are connected by a connector 701, which allows the anchor bolt to be further lengthened. The connector 701 is a metal connecting sleeve. The connecting ends of the two sections 301 and 302 are threaded 702 and threaded to the connector 701. All metal components, including the two sections 301 and 302 and the connector 701, are galvanized or epoxy coated at the factory.

[0018] Grouting between the plastic corrugated sleeve 502 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 openings on the support leg 3052 and enter the space between the plastic corrugated sleeve 502 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 near the outer end of the anchor hole. The space between the corrugated sleeve 502 and the anchor rod body, or the space communicating with the space, is connected to a grout inlet pipe 401 and a grout return pipe 404. In this embodiment, on-site grouting is performed. The grout inlet pipe 401 passes through the opening on the hemispherical washer 303, and then extends along the surface of the corrugated sleeve 502 to the space between the anchor rod body, the inner end of the corrugated sleeve 502 and the anti-corrosion cap 506. The inlet of the grout return pipe 404 is close to the outer end of the anchor rod hole, and it passes through the hole on the hemispherical washer 303.

[0019] The implementation steps are as follows: After drilling and cleaning are completed on site, the anchor bolt enters the anchor bolt hole 101, which consists of rod body 301 & 302, plastic corrugated sleeve 502, connector 701, support plate 305, hemispherical washer 303, nut 304, annular sealing ring 505, heat shrink sleeve 503, grouting pipe 401~404, etc.

[0020] Pure cement grout is injected through the internal grout inlet pipe 401, and air is released through the internal grout return pipe 404. Grouting is stopped once the grout return at the upper end of the internal grout return pipe 404 is stable. In particular, the grouting between the plastic corrugated sleeve 502 and the rods 301 and 302 can also be filled with pre-filled cement grout in the factory to ensure that the grout body 202 inside the plastic corrugated sleeve 502 does not produce cracks exceeding the limit width under working load. The grout bodies 202 & 203 can be made of non-expansion cement grout.

[0021] Similarly, pure cement slurry is injected through the external slurry inlet pipe 402, and air is released through the external slurry return pipe 403. Grouting is stopped after the slurry returns steadily through the upper end of the external slurry return pipe 403.

[0022] Once the grout reaches the specified strength, the anchor head is locked using nut 304. Finally, the anchor head is sealed with protective concrete 201.

[0023] The grout inlet pipe and grout return pipe described and illustrated in this embodiment 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.

[0024] 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 double layer corrosion proof non-prestressed anchor rod with coating and corrugated casing comprising a non-prestressed rigid anchor rod body with a corrosion proof layer, characterized in that, The front end of the 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 semispherical washer, the arched part of the support plate is provided with a spherical surface support hole matched with the semispherical washer, the semispherical washer can be rotated to adjust the included angle with the anchor hole orifice, the rear end of the semispherical washer is provided with an extension sleeve coaxial with the semispherical washer, and the periphery of the support plate is arranged to be matched with the anchor hole orifice. A plastic corrugated sleeve is arranged on the periphery of the anchor rod body, a spacer is arranged between the plastic corrugated sleeve and the anchor rod body and filled with cement slurry solidification body, a centering support is arranged between the corrugated sleeve and the wall of the anchor hole and filled with cement slurry solidification body, a corrosion-proof cap is arranged at the rear end of the corrugated sleeve, a sealing ring is arranged between the corrosion-proof cap and the corrugated sleeve, a rear heat shrinkage sleeve is further sleeved at the connection between the corrosion-proof cap and the 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 as to realize the closed integrity of the anchor rod body.

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

5. A two-layered corrosion protected non-prestressed anchor rod with coating and corrugated casing as claimed in claim 1 characterized in that: The support plate and the semispherical washer are provided with zinc plating or epoxy anticorrosive coating, the periphery of the support plate can be designed to have different inclination angles, the different sides of the arched part can be designed to have different lengths and inclinations, the periphery of the support plate constitutes a support leg, the arched part constitutes 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.

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