Construction method of basalt fiber rib anchor rod-containing slope supporting structure

Abstract

The invention discloses a construction method of a slope supporting structure containing basalt fiber rib anchor rods. The slope supporting structure comprises basalt fiber rib anchor rod bodies arranged in a slope, a slope surface layer and slope top fixing nails arranged at the top of the slope surface layer. The slope layer and the basalt fiber rib anchor rod body are connected through a butt joint piece, and the butt joint piece and the basalt fiber rib anchor rod body are further provided with a sleeve connecting piece. Through combined arrangement of the basalt fiber rib anchor rod body and the slope surface layer, effective supporting of the slope is guaranteed. And through the arrangement of the butt joint piece, mechanical connection of the basalt fiber rib anchor rod body and the reinforcing mesh is guaranteed, field welding is avoided, and construction is convenient and fast. Through the arrangement of the sleeve connecting piece, subsequent threaded connection is facilitated after the basalt fiber rib anchor rod body is connected in a sleeved mode, the basalt fiber rib anchor rod body and the basalt fiber rib anchor rod body are effectively connected through the bonding layer, and binding and welding on site are avoided as well.

Description

Technical Field

[0001] The present invention relates to the technical field of the construction of the anchor rod body of basalt fiber reinforced bars, and particularly relates to a construction method for a slope support structure with an anchor rod containing basalt fiber reinforced bars. Background Art

[0002] In the construction of foundation pit slopes, strengthening the slopes by anchor rods is a commonly used treatment measure. Generally, anchor rods are made of traditional steel bars and are welded to the steel bar mesh on the slope surface layer. With the development of material technology, basalt fiber reinforced bars (BFRP) have gradually become an important alternative material to traditional steel bars. Basalt fiber reinforced bars have significant advantages such as high tensile strength, strong corrosion resistance, light weight, and electromagnetic neutrality. However, the fixation of the reinforced bars to the steel bar mesh on the slope surface layer is generally on-site welding, which is not only inconvenient for construction and has certain risks; moreover, it is through binding, and there is a problem that the connection is not firm. Moreover, there is little research on how to effectively and conveniently construct the slope support structure with an anchor rod containing basalt fiber reinforced bars, so targeted design is required. Summary of the Invention

[0003] The present invention provides a construction method for a slope support structure with an anchor rod containing basalt fiber reinforced bars, so as to solve technical problems such as butt joint connection, strengthening, and convenient construction of the slope support structure with an anchor rod containing basalt fiber reinforced bars.

[0004] To achieve the above object, the present invention adopts the following technical solutions: A construction method for a slope support structure with an anchor rod containing basalt fiber reinforced bars, the slope support structure includes a basalt fiber reinforced bar anchor rod body arranged in the slope, a slope surface layer is arranged at the top of the basalt fiber reinforced bar anchor rod body, and a slope top fixing nail is arranged at the top of the slope surface layer; the slope surface layer and the ground are connected through the slope top fixing nail; The slope surface layer and the basalt fiber reinforced bar anchor rod body are connected through a docking member, and a sleeve connecting member is also arranged between the docking member and the basalt fiber reinforced bar anchor rod body; The construction method for the slope support structure with an anchor rod containing basalt fiber reinforced bars is specifically as follows: Step 1: Carry out foundation pit excavation. After the earthwork is excavated to 0.5 m below the design elevation of the basalt fiber reinforced bar anchor rod body, then the slope surface is promptly trimmed manually; the allowable deviation of the slope surface flatness is within ±20 mm; Step 2: Use a Luoyang shovel to manually form holes in groups of two; during the hole forming process, the inclination angle and hole diameter of the hole are made corresponding to the design inclination angle and hole diameter of the basalt fiber reinforced bar anchor rod body. After the hole is formed, the hole depth, hole diameter, and inclination angle are inspected and accepted; The formed hole diameter is set corresponding to the diameter of the basalt fiber reinforced bar anchor rod body, and an enlarged hole section is arranged at the top, and the diameter of the enlarged hole section is set corresponding to the sleeve connecting member; Step 3: Fabricate the basalt fiber reinforced bar anchor rod body, the docking piece and the sleeve connecting piece according to the design requirements; fabricate the slope surface layer, in which the steel mesh in the slope surface layer is fabricated according to the design requirements; insert the basalt fiber reinforced bar anchor rod body into the hole, then fixedly connect the sleeve connecting piece to the top of the basalt fiber reinforced bar anchor rod body, and then connect it to the docking piece; among them, the docking piece is pre-connected to the reinforcing bar outside the steel mesh. Step 4: Grout in the hole formed by the basalt fiber reinforced bar anchor rod body. Prepare the cement slurry according to the water-cement ratio of 0.5. Insert the grouting pipe to the bottom of the hole. Perform secondary supplementary grouting within 2.0 hours after the first grouting is completed, and seal the hole opening; the outer completed surface of the slurry body is flush with the top of the sleeve connecting piece. Step 5: Spray concrete within the range where the steel mesh is tied to form the slope surface layer. The spraying operation is carried out in sections. The allowable deviation of the thickness of the sprayed concrete is within ±10 mm; thus, the construction of the slope support structure containing the basalt fiber reinforced bar anchor rod is completed.

[0005] Further, the docking piece is in a T shape, including a docking horizontal part connected to the reinforcing bar and a docking vertical part connected to the basalt fiber reinforced bar anchor rod body. A sleeve connecting piece is arranged between the docking vertical part and the basalt fiber reinforced bar anchor rod body connection. The docking horizontal part is a straight sleeve and the inside of the sleeve is smooth. The inner diameter of the straight sleeve is larger than the outer diameter of the reinforcing bar, and the gap between the two is filled with an adhesive layer; the docking vertical part is a straight sleeve and a docking internal thread section is arranged inside the straight sleeve, and the docking internal thread section is correspondingly connected to the sleeve connecting piece.

[0006] Further, the sleeve connecting piece includes a main sleeve and a sleeve external thread section arranged in the upper middle part outside the main sleeve. The inner diameter of the main sleeve corresponds to the outer diameter of the basalt fiber reinforced bar anchor rod body; the length of the main sleeve is greater than 10 times the diameter of the basalt fiber reinforced bar anchor rod body; among them, the basalt fiber reinforced bar anchor rod body is sleeved inside the main sleeve and a bonding layer is arranged at the sleeved connection.

[0007] Further, the length of the sleeve external thread section is 5-6 times the diameter of the basalt fiber reinforced bar anchor rod body, and the sleeve external thread section is correspondingly connected to the docking internal thread section of the docking vertical part.

[0008] Further, the slope surface layer includes a concrete layer and a steel mesh arranged inside the concrete layer. The concrete layer is sprayed concrete with a thickness of 80 mm; the bottom of the slope surface layer is arranged at the bottom of the foundation pit, and an extension section is arranged at the top of the slope. The length of the extension section is at least 1000 mm; the slope surface layer of the extension section is fixedly connected to the slope through the slope top fixing nails.

[0009] Furthermore, during the shotcrete construction, the spraying sequence within the same section is from bottom to top, and the nozzle should be kept perpendicular to the sprayed surface during spraying; the spraying distance is 0.8 - 1.5 m, and water curing should be carried out 2 hours after the shotcrete has finally set; when spraying concrete for each layer of the basalt fiber reinforced bar anchor rod body, a set of concrete test blocks should be made and inspected after 28 days of standard curing.

[0010] Furthermore, the steel mesh is a double-layer steel mesh, and the mesh nodes in the steel mesh are connected by spot welding or binding, and the lap length of the mesh is not less than 300 mm; the thickness of the steel bar protective layer is greater than 25 mm.

[0011] Furthermore, the basalt fiber reinforced bar anchor rod body is inclined and forms an angle of 10 degrees with the horizontal plane; the basalt fiber reinforced bar anchor rod bodies are arranged at intervals in the slope height direction; the end of the basalt fiber reinforced bar anchor rod body passes through the hole of the steel mesh and is connected to the reinforcement bar.

[0012] Furthermore, the reinforcement bar is a basalt fiber reinforcement bar, and the diameter of the reinforcement bar is larger than the diameter of the steel bars in the steel mesh; the reinforcement bar is arranged outside the steel mesh.

[0013] The beneficial effects of the present invention are as follows: Through the combined setting of the basalt fiber reinforced bar anchor rod body and the slope surface layer, the present invention is beneficial to ensuring the effective support of the slope. Through the setting of the docking part, it is beneficial to ensure the mechanical connection at the basalt fiber reinforced bar anchor rod body and the steel mesh, avoiding on-site welding and facilitating construction; among them, the setting of the adhesive layer and the internal threaded section in the docking part ensures the firmness of the mechanical connection and the convenience of on-site construction. Through the setting of the sleeve connector, it is beneficial to socket the basalt fiber reinforced bar anchor rod body for subsequent threaded connection, and the connection between the two is effectively connected through the adhesive layer, also avoiding on-site binding and welding. And through the setting of the reinforcement bar, on-site hole formation, anchor rod grouting and the shotcrete surface layer, it is beneficial to comprehensively improve the slope support ability. Other features and advantages of the present invention will be described in the subsequent specification, and will be partially obvious from the specification, or will be understood by implementing the present invention; the main purpose and other advantages of the present invention can be achieved and obtained through the solutions specifically pointed out in the specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the installation schematic diagram of the slope support structure containing basalt fiber reinforced bar anchor rods; Figure 2 is the schematic diagram of the slope surface layer and its connection structure; Figure 3 is the connection schematic diagram of the basalt fiber reinforced bar anchor rod body, the reinforcement bar, the docking part and the sleeve connector; Figure 4 is the front view of the docking part structure; Figure 5 It is a side view of the docking component structure; Figure 6 It is a schematic diagram of the connection structure between the basalt fiber reinforced bar anchor rod body and the sleeve connection piece; Figure 7 It is a schematic diagram of the sleeve connection piece structure.

[0015] Reference numerals: 1 - ground, 2 - slope, 3 - foundation pit, 4 - slope top fixing nail, 5 - slope surface layer, 51 - concrete layer, 52 - steel mesh, 6 - basalt fiber reinforced bar anchor rod body, 7 - reinforcing rib, 8 - adhesion layer, 9 - docking component, 91 - docking horizontal part, 92 - docking vertical part, 93 - docking internal thread section, 10 - sleeve connection piece, 101 - main sleeve, 102 - sleeve external thread section, 11 - bonding layer. Specific implementation manner

[0016] Taking the foundation pit support of a certain construction project as an example, as Figures 1 to 7 shown, for the construction method of the slope support structure containing basalt fiber reinforced bar anchor rods, the slope support structure includes the basalt fiber reinforced bar anchor rod body 6 arranged in the slope 2, a slope surface layer 5 is arranged at the top of the basalt fiber reinforced bar anchor rod body 6, and a slope top fixing nail 4 is arranged at the top of the slope surface layer 5; the slope surface layer 5 and the ground 1 are connected by the slope top fixing nail 4. Among them, the slope surface layer 5 and the basalt fiber reinforced bar anchor rod body 6 are connected by a docking component 9, and a sleeve connection piece 10 is also arranged between the docking component 9 and the basalt fiber reinforced bar anchor rod body 6.

[0017] The slope surface layer 5 includes a concrete layer 51 and a steel mesh 52 arranged inside the concrete layer 51. The concrete layer 51 is shotcrete with a thickness of 80 mm; the bottom of the slope surface layer 5 is arranged at the bottom of the foundation pit 3, and an extension section is arranged at the top at the slope top, and the length of the extension section is at least 1000 mm; the extension section of the slope surface layer 5 is fixedly connected to the slope 2 by the slope top fixing nail 4.

[0018] Combined with Figures 1 to 7 shown, the construction method of the slope support structure containing basalt fiber reinforced bar anchor rods is further described. The specific steps are as follows: Step 1: Excavate the foundation pit 3. After the earthwork is excavated to 0.5 m below the design elevation of the basalt fiber reinforced bar anchor rod body 6, then the slope surface is promptly trimmed manually; the allowable deviation of the slope surface flatness is within ±20 mm.

[0019] Step 2: Use a Luoyang shovel to manually form holes, with two people in a group; during the hole forming process, the inclination angle and hole diameter of the hole are made corresponding to the design inclination angle and hole diameter of the basalt fiber reinforced bar anchor rod body 6. After the hole is formed, the hole depth, hole diameter, and inclination angle are inspected and accepted. The hole forming diameter is set corresponding to the diameter of the basalt fiber reinforced bar anchor rod body 6, and an enlarged hole section is arranged at the top, and the diameter of the enlarged hole section is set corresponding to the outer diameter of the sleeve connection piece 10.

[0020] Among them, the basalt fiber reinforced bar anchor rod body 6 is inclined and forms an angle of 10 degrees with the horizontal plane; the basalt fiber reinforced bar anchor rod bodies 6 are arranged at intervals in the height direction of the slope 2; the end of the basalt fiber reinforced bar anchor rod body 6 passes through the holes of the steel mesh and is connected to the reinforcing bar 7.

[0021] Step 3: Fabricate the basalt fiber reinforced bar anchor rod body 6, the docking piece 9 and the sleeve connecting piece 10 according to the design requirements; fabricate the slope surface layer, and the steel mesh 52 in the slope surface layer is fabricated according to the design requirements; insert the basalt fiber reinforced bar anchor rod body 6 into the holes, then fixedly connect the sleeve connecting piece 10 to the top of the basalt fiber reinforced bar anchor rod body 6, and then connect it to the docking piece 9; among them, the docking piece 9 is pre-connected to the reinforcing bar outside the steel mesh 52.

[0022] In this embodiment, the steel mesh 52 is a bidirectional steel mesh, the mesh nodes in the steel mesh 52 are spot-welded or tied, and the lap length of the mesh is not less than 300 mm; the thickness of the steel bar protection layer is greater than 25 mm.

[0023] Among them, the docking piece 9 is in a T shape, including a docking horizontal part 91 connected to the reinforcing bar 7 and a docking vertical part 92 connected to the basalt fiber reinforced bar anchor rod body 6. A sleeve connecting piece 10 is arranged between the docking vertical part 92 and the basalt fiber reinforced bar anchor rod body 6. The docking horizontal part 91 is a straight sleeve and the inside of the sleeve is smooth. The inner diameter of the straight sleeve is greater than the outer diameter of the reinforcing bar 7, and the gap between the two is filled with an adhesion layer 8; the docking vertical part 92 is a straight sleeve and a docking internal thread section 93 is arranged inside the straight sleeve, and the docking internal thread section 93 is correspondingly connected to the sleeve connecting piece 10. The reinforcing bar 7 is a basalt fiber reinforcing bar 7, and the diameter of the reinforcing bar 7 is greater than the diameter of the steel bars in the steel mesh 52; the reinforcing bar 7 is tied to the outside of the steel mesh 52 or directly arranged on the outside of the steel mesh 52 and is directly fixed in the concrete layer 51 through subsequent shotcrete. Among them, the adhesion layer 9 is a grouting layer or a structural adhesive layer.

[0024] Among them, the sleeve connecting piece 10 includes a main sleeve 101 and a sleeve external thread section 102 arranged in the upper middle part outside the main sleeve 101. The inner diameter of the main sleeve 101 is correspondingly set according to the outer diameter of the basalt fiber reinforced bar anchor rod body 6; the length of the main sleeve 101 is greater than 10 times the diameter of the basalt fiber reinforced bar anchor rod body 6; among them, the basalt fiber reinforced bar anchor rod body 6 is sleeved inside the main sleeve 101 and a bonding layer 11 is arranged at the sleeved connection. The length of the sleeve external thread section 102 is 5-6 times the diameter of the basalt fiber reinforced bar anchor rod body 6, and the sleeve external thread section 102 is correspondingly connected to the docking internal thread section 93 of the docking vertical part 92.

[0025] Step 4: Grout the drilled hole of the basalt fiber reinforced bar anchor rod body. Prepare cement slurry according to the water-cement ratio of 0.5. Insert the grouting pipe to the bottom of the hole. Conduct secondary supplementary grouting within 2.0 hours after the first grouting is completed, and seal the hole opening; the outer finished surface of the slurry is flush with the top of the sleeve connector.

[0026] Step 5: Spray concrete within the range where the steel bar mesh 52 is tied to form a slope surface layer 5. The spraying operation is carried out in sections, and the allowable deviation of the thickness of the sprayed concrete is within ±10 mm; thus, the construction of the slope support structure containing basalt fiber reinforced bar anchor rods is completed.

[0027] During the concrete spraying construction, the spraying sequence within the same section is from bottom to top. When spraying, the nozzle is kept perpendicular to the sprayed surface; the spraying distance is 0.8 - 1.5 m, and water curing is carried out 2 hours after the sprayed concrete has finally set; when spraying concrete for each layer of basalt fiber reinforced bar anchor rod body 6, make a set of concrete test blocks and conduct inspection after 28 days of standard curing.

[0028] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. Construction method of slope support structure with basalt fiber reinforced bar anchor, characterized in that, The slope support structure includes a basalt fiber reinforced bar anchor rod body arranged in the slope, a slope surface layer is arranged at the top of the basalt fiber reinforced bar anchor rod body, and a slope top fixing nail is arranged at the top of the slope surface layer; the slope surface layer and the ground are connected by the slope top fixing nail; The slope surface layer and the basalt fiber reinforced bar anchor rod body are connected by a docking part, and a sleeve connecting part is also arranged between the docking part and the basalt fiber reinforced bar anchor rod body; The construction method of the slope support structure containing the basalt fiber reinforced bar anchor rod body is as follows: Step 1: Carry out foundation pit excavation. After the earthwork is excavated to 0.5 m below the design elevation of the basalt fiber reinforced bar anchor rod body, the slope surface is promptly trimmed manually; the allowable deviation of the slope surface flatness is within ±20 mm; Step 2: Use a Luoyang shovel to manually form holes in groups of two people; during the hole forming process, the inclination angle and aperture of the hole are made corresponding to the design inclination angle and aperture of the basalt fiber reinforced bar anchor rod body. After the hole is formed, the hole depth, aperture, and inclination angle are inspected and accepted; The formed hole diameter is set corresponding to the diameter of the basalt fiber reinforced bar anchor rod body, and an enlarged hole section is arranged at the top. The diameter of the enlarged hole section is set corresponding to the outer diameter of the sleeve connecting part; Step 3: Fabricate the basalt fiber reinforced bar anchor rod body, docking part, and sleeve connecting part according to the design requirements; fabricate the slope surface layer, and the steel mesh in the slope surface layer is fabricated according to the design requirements; insert the basalt fiber reinforced bar anchor rod body into the hole, then fixedly connect the sleeve connecting part to the top of the basalt fiber reinforced bar anchor rod body, and then connect it to the docking part; among them, the docking part is pre-connected to the reinforcement bar outside the steel mesh; Step 4: Grout in the formed hole of the basalt fiber reinforced bar anchor rod body. Prepare cement slurry according to the water-cement ratio of 0.

5. Insert the grouting pipe to the bottom of the hole. Carry out secondary supplementary grouting within 2.0 hours after the first grouting is completed, and seal the hole mouth; the outer completion surface of the slurry is set flush with the top of the sleeve connecting part; Step 5: Spray concrete within the range where the steel mesh is tied to form a slope surface layer. The spraying operation is carried out in sections. The allowable deviation of the thickness of the sprayed concrete is within ±10 mm; thus, the construction of the slope support structure containing the basalt fiber reinforced bar anchor rod is completed.

2. The construction method of a slope support structure with a basalt fiber reinforced bar anchor as claimed in claim 1, characterized in that, The docking part is in a T shape, including a docking horizontal part connected to the reinforcement bar and a docking vertical part connected to the basalt fiber reinforced bar anchor rod body. A sleeve connecting part is arranged between the docking vertical part and the basalt fiber reinforced bar anchor rod body; The docking horizontal part is a straight sleeve and the inside of the sleeve is smooth. The inner diameter of the straight sleeve is larger than the outer diameter of the reinforcement bar, and the gap between the two is filled with an adhesive layer; the docking vertical part is a straight sleeve and an internal docking thread section is arranged inside the straight sleeve, and the internal docking thread section is correspondingly connected to the sleeve connecting part.

3. The construction method of a slope support structure with a basalt fiber reinforced bar anchor as claimed in claim 2, characterized in that, The sleeve connecting part includes a main sleeve and a sleeve external thread section arranged in the upper middle part outside the main sleeve. The inner diameter of the main sleeve is set corresponding to the outer diameter of the basalt fiber reinforced bar anchor rod body; the length of the main sleeve is greater than 10 times the diameter of the basalt fiber reinforced bar anchor rod body; among them, the basalt fiber reinforced bar anchor rod body is sleeved inside the main sleeve and a bonding layer is arranged at the sleeved connection.

4. The construction method of a slope support structure with a basalt fiber reinforced bar anchor as described in claim 3, characterized in that, The length of the sleeve external thread section is 5-6 times the diameter of the basalt fiber reinforced bar anchor rod body, and the sleeve external thread section is correspondingly connected to the internal docking thread section of the docking vertical part.

5. The construction method of a slope support structure with a basalt fiber reinforced bar anchor as claimed in claim 1, characterized in that, The slope surface layer includes a concrete layer and a steel mesh sheet disposed inside the concrete layer. The concrete layer is shotcrete with a thickness of 80 mm. The bottom of the slope surface layer is set at the bottom of the foundation pit, and an extension section is provided at the top of the slope, and the length of the extension section is at least 1000 mm. The slope surface layer of the extension section is fixedly connected to the slope by slope top fixing nails.

6. The construction method of a slope support structure with a basalt fiber reinforced bar anchor as claimed in claim 5, characterized in that, During the concrete spraying construction, the spraying sequence within the same segment is from bottom to top. When spraying, the nozzle is kept perpendicular to the sprayed surface. The spraying distance is 0.8 - 1.5 m. Water spraying maintenance is carried out 2 hours after the final setting of the shotcrete. When spraying concrete for each layer of basalt fiber reinforced bar anchor rod body, a set of concrete test blocks is made and inspected after 28 days of standard curing.

7. The construction method of a slope support structure with a basalt fiber reinforced bar anchor as claimed in claim 5, characterized in that, The steel mesh sheet is a bidirectional steel mesh. The mesh nodes in the steel mesh sheet are connected by spot welding or binding, and the lap length of the mesh sheet is not less than 300 mm. The thickness of the steel bar protective layer is greater than 25 mm.

8. The construction method of a slope support structure with a basalt fiber reinforced bar anchor as claimed in claim 1, characterized in that, The basalt fiber reinforced bar anchor rod body is inclined and forms an angle of 10 degrees with the horizontal plane. The basalt fiber reinforced bar anchor rod bodies are arranged at intervals in the slope height direction. The end of the basalt fiber reinforced bar anchor rod body passes through the holes of the steel mesh sheet and is connected to the reinforcement bar.

9. The construction method of a slope support structure with a basalt fiber reinforced bar anchor as claimed in claim 1, characterized in that, The reinforcement bar is a basalt fiber reinforcement bar, and the diameter of the reinforcement bar is larger than the diameter of the steel bars in the steel mesh sheet. The reinforcement bar is arranged outside the steel mesh sheet.

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