Patent Application
20230151575
This application claims priority to Chinese Patent Application No. 202111345981.X with a filing date of Nov. 15, 2021. The content of the aforementioned application, including any intervening amendments thereto, is incorporated herein by reference.
The present disclosure relates to the technical field of geotechnical engineering anchoring, in particular to a rapid construction device and method for a prestressed basalt fiber anchor rod.
As one of the main supporting forms of slope engineering, the anchor rod can effectively prevent the structural deformation and maintain the structural stability. A rock-soil anchoring structure of a common steel anchor rod mostly has the durability problem caused by steel bar corrosion, which brings potential safety hazards to a supporting structure. The basalt fiber reinforced plastic (BFRP) with the advantages of high tensile strength, desirable corrosion resistance, desirable stability, convenience in material obtaining, etc. is a good substitute of steel bars in the anchoring technology. As the BFRP has the features of weak shear strength and high tensile strength in mechanical properties, it is difficult to directly anchor and tension the BFRP. At the present stage, the BFRP is generally connected to a steel strand and other metal bar materials through a steel casing pipe connector at the end of the BFRP, and epoxy resin is poured into the connector casing pipe to prepare the composite bar material. The manufacturing and construction process of the basalt fiber anchor rod is complex and needs high technological requirements, so the rapid construction requirement is difficult to meet.
In view of this, for solving the problem that the manufacturing and construction process of the basalt fiber anchor rod is complex and needs high technological requirements, such that the rapid construction requirement is difficult to meet, the embodiment of the present disclosure provides a rapid construction device and method for a prestressed basalt fiber anchor rod.
Embodiments of the present disclosure provide a rapid construction device for a prestressed basalt fiber anchor rod, including a drilling, bar-penetrating and grouting assembly, the drilling, bar-penetrating and grouting assembly includes a sleeve drill rod and a drill bit;
the sleeve drill rod includes a drill rod inner cylinder and a drill rod outer cylinder arranged around the drill rod inner cylinder;
a middle part of the drill bit is connected to a lower end of the drill rod inner cylinder, an edge of the drill is connected to a lower end of the drill rod outer cylinder, a constraint hole is defined in the middle part of the drill bit so as to allow a basalt fiber reinforced plastic (BFRP) penetrating the drill rod inner cylinder to penetrate, a magnetic baffle is arranged at a lower end of the constraint hole to shield the constraint hole, and a plurality of through holes are defined in a portion, between the drill rod inner cylinder and the drill rod outer cylinder, of the drill bit; and
the sleeve drill rod is configured to be connected to a drilling machine and driven by the drilling machine to drill and lift, during drilling to a set depth, the BFRP is pushed to push off the magnetic baffle to lower the BFRP to a set position, and during lifting, a space between the drill rod outer cylinder and the drill rod inner cylinder is grouted, and slurry falls below the drill bit via the through hole.
Further, a boss extending upwards is arranged in the middle part of the drill bit, and the constraint hole is a vertical via hole defined in the boss.
Further, a groove is defined in a position, located at the lower end of the constraint hole, of a lower portion of the boss so as to allow the magnetic baffle be embedded.
Further, the rapid construction device for a prestressed basalt fiber anchor rod includes an air blowing pump and a pressure pump, the air blowing pump is configured to blow air between the drill rod outer cylinder and the drill rod inner cylinder when the sleeve drill rod drills, and the pressure pump is used for grouting between the drill rod outer cylinder and the drill rod inner cylinder when the sleeve drill rod lifts.
Further, the rapid construction device for a prestressed basalt fiber anchor rod includes a prestress applying assembly which includes a leveling base plate supported at an opening of an anchor hole, a center hole jack arranged on the leveling base plate and a hydraulic extendable clamp arranged on the center hole jack, an upper end of the BFRP with the lower end anchored sequentially penetrates the center hole jack and the hydraulic extendable clamp, the hydraulic extendable clamp is configured to clamp the BFRP, and the center hole jack is configured to apply prestress to the BFRP.
Further, the hydraulic extendable clamp includes two steel ring beams oppositely arranged one above the other and an outer wrapping layer mounted between the two steel ring beams, the outer wrapping layer including a steel layer, a basalt fiber layer and a nylon fiber layer which are arranged from outside to inside sequentially, an oil injection cavity is defined in the steel layer, an oil inlet is defined in an outer wall of the steel layer, and a surface of the nylon fiber layer is roughened.
Further, the leveling base plate includes a top plate and a plurality of support legs connected to a bottom of the top plate, each of the support legs including an upper support leg and a lower support leg, the lower support leg is fixed at the opening of the anchor hole, an adjustment hole is defined in a lower end of the upper support leg, and an upper end of the lower support leg is connected to the adjustment hole in a fastened manner via a fastener.
Further, the rapid construction device for a prestressed basalt fiber anchor rod includes a hole plug anchor sealing assembly which includes a grouting baffle arranged at the opening of the anchor hole and a slurry baffle arranged in the anchor hole and distanced from the opening of the anchor hole with a set value, the BFRP sequentially penetrates the slurry baffle and the grouting baffle from bottom to top, an edge of the slurry baffle makes sealed contact with a wall of the anchor hole, a grouting pipe penetrates the grouting baffle, and the grouting pipe is used for grouting between the grouting baffle and the slurry baffle to form a concrete hole plug for locking the upper end of the BFRP.
Further, an outer seal ring sleeves the edge of the slurry baffle so as to press the wall of the anchor hole for sealing; and a bar bundle hole is defined in a middle part of the slurry baffle, and an inner seal ring is embedded in the bar bundle hole so as to allow the BFRP to penetrate and press the BFRP for sealing.
Embodiments of the present disclosure also provides a rapid construction method for a prestressed basalt fiber anchor rod, using the rapid construction device for a prestressed basalt fiber anchor rod, and including:
S1. connecting a sleeve drill rod to a drilling machine, and driving the sleeve drill rod by the drilling machine to drill to a set depth to form an anchor hole;
S2. pushing a BFRP downwards to make a magnetic baffle fall off, and then lowering the BFRP to a set position; and
S3. lifting the sleeve drill rod via rotation of the drilling machine, grouting a space between a drill rod outer cylinder and a drill rod inner cylinder, and making slurry fall below a drill bit via a through hole, so as to anchor a lower end of the BFRP via solidification of the slurry.
The technical solution defined in the embodiment of the present disclosure has the beneficial effects that in the rapid construction device and method for a prestressed basalt fiber anchor rod, a basalt fiber reinforced plastic (BFRP) is lowered in an anchor hole drilling process, the BFRP is lowered to a preset anchoring position, meanwhile, grouting is completed in a sleeve drill rod returning and lifting process, in the grouting process, the BFRP is constrained by a constraint hole to be kept at the preset position, drilling, bar-penetrating and grouting of an anchoring section are completed simultaneously, the defects that a traditional basalt fiber anchor rod construction process is complex and tedious can be overcome, construction may be completed rapidly and efficiently, guarantee is provided for safety of a supporting structure, and the construction efficiency of the basalt fiber anchor rod may be greatly improved.
In the figures: 1—sleeve drill rod, 101—drill rod outer cylinder, 102—drill rod inner cylinder, 2—drill bit, 201—polycrystalline diamond compact (PDC) drill bit wall, 201a—through hole, 202—via hole wall, 202a—boss, 202b—magnetic baffle, 203—metal cutting edge, 3—anchor hole, 4—basalt fiber reinforced plastic, 5—leveling base plate, 501—top plate, 502—support leg, 502a—upper support leg, 502b—lower support leg, 502c—adjustment bolt, 503—angle gauge, 504—expansion bolt, 6—center hole jack, 7—hydraulic extendable clamp, 701—steel ring beam, 701a—fixing screw rod, 702—steel layer, 702a—oil inlet, 703—basalt fiber layer, 704—nylon fiber layer, 8—slurry baffle, 801—outer seal ring, 802—bar bundle hole, 803—inner seal ring, 9—grouting baffle, 901—grouting pipe, 902—exhaust port, 10—anchoring section, and 11—concrete hole plug.
In order to make the objective, technical solution and advantages of the present disclosure clearer, embodiments of the present disclosure will be further described in detail in conjunction with the accompanying drawings. The following describes a preferred one of a number of possible embodiments of the present disclosure, and is intended to provide a basic understanding of the present disclosure, but is not intended to identify key or critical elements of the present disclosure or to define the scope of protection.
In the description of the present disclosure, it should be noted that, unless otherwise clearly specified, meanings of terms “mount” and “connect” should be understood in a board sense. For example, the connection may be a fixed connection, a detachable connection, or an integral connection; may be a mechanical connection or an electrical connection; may be a direct connection or an indirect connection by using an intermediate medium; or may be intercommunication between two components. Those of ordinary skill in the art may understand specific meanings of the foregoing terms in the present disclosure based on a specific situation.
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In addition, a magnetic baffle 202b is arranged at a lower end of the constraint hole to shield the constraint hole, and the magnetic baffle 202b is used for blocking the lower end of the constraint hole so as to prevent the BFRP 4 from falling into the bottom of the hole in a drilling process, and further to prevent drilling cuttings from entering the drill rod inner cylinder 102. In this embodiment, a boss 202a extending upwards is arranged in the middle part of the drill bit 2, the boss 202a is located at a lower end of the via hole wall 202, and the constraint hole is a vertical via hole defined in the boss 202a. A groove is defined in a position, located at the lower end of the constraint hole, of a lower portion of the boss 202a so as to allow the magnetic baffle 202b to be embedded, and the magnetic baffle 202b abuts against the lower end of the BFRP 4 penetrating the constraint hole.
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The drilling, bar-penetrating and grouting assembly further includes an air blowing pump and a pressure pump. The drilling, bar-penetrating and grouting assembly is used for drilling, bar-penetrating and grouting. Specifically, the sleeve drill rod 1 is connected to a drilling machine and driven by the drilling machine to drill and lift. During drilling, the sleeve drill rod 1 drills to a set depth to form an anchor hole, in the drilling process, air is blown between the drill rod outer cylinder 101 and the drill rod inner cylinder 102 via the air blowing pump, the airflow is blown out from the through hole, and drilling cuttings are blown out. During bar penetrating, the BFRP 4 is pushed to push off the magnetic baffle 202b, such that the BFRP 4 is lowered to a set position. During grouting, the sleeve drill rod 1 is lifted via rotation of the drilling machine, a space between the drill rod outer cylinder 101 and the drill rod inner cylinder 102 is grouted by using the pressure pump, and slurry falls below the drill bit 2 via the through hole 201a, so as to anchor the lower end of the BFRP 4 via solidification of the slurry.
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Specifically, the lower support leg 502b is fixed to the opening of the anchor hole 3 via an expansion bolt 504, the expansion bolt 504 being mounted to an earth surface where the opening of the anchor hole 3 is located. The lower support leg 502b is L-shaped and is connected to the expansion bolt 504 in a fastened manner.
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An upper top face and a lower top face of the steel layer 702 are provided with a plurality of sets of inwards-concave threaded concave holes, the steel ring beam 701 is provided with a plurality of via holes, the via holes correspond one-to-one to the threaded concave holes, and fixing screw rods 701a penetrate the via holes respectively so as to connect the via holes to the corresponding threaded concave holes. In this way, an upper end and a lower end of the steel layer 702 are fixedly connected to the two steel ring beams 701 respectively. The steel layer 702 may only press the BFRP 4 inwards under the action of oil pressure, and an inner surface of the nylon fiber layer 704 needs to be roughened to increase static friction between the nylon fiber layer 704 and the BFRP 4.
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After the center hole jack 6 applies the prestress to the BFRP 4, the grouting pipe 901 is used for grouting between the grouting baffle 9 and the slurry baffle 8 to form a concrete hole plug 11 for locking the upper end of the BFRP 4.
In addition, as shown in
S1. connect a sleeve drill rod 1 to a drilling machine, drive the sleeve drill rod 1 by the drilling machine to drill to a set depth to form an anchor hole 3, and blow air between a drill rod outer cylinder 101 and a drill rod inner cylinder 102 via an air blowing pump in a drilling process, so as to blow drilling cuttings out of a gap between the drill rod outer cylinder 101 and the anchor hole 3;
S2. push a BFRP 4 downwards to make a magnetic baffle 202b fall off, and then lowering the BFRP 4 to a set position; and
S3. lift the sleeve drill rod 1 via rotation of the drilling machine, grout a space between the drill rod outer cylinder 101 and the drill rod inner cylinder 102 via a pressure pump, and make slurry fall below a drill bit 2 via a through hole 201a, so as to anchor a lower end of the BFRP 4 via solidification of the grout to form an anchoring section 10. In a lifting process of the sleeve drill rod 1, the BFRP 4 is constrained by a constraint hole to be kept at a set position, so as to anchor the BFRP 4 at the preset position.
Then slurry for an anchoring section 10 is maintained, after the slurry is solidified to reach designed strength, the BFRP 4 sequentially penetrates a slurry baffle 8 and a grouting baffle 9 from bottom to top, and the slurry baffle 8 and the grouting baffle 9 are mount at designed positions respectively. Then, a leveling base plate 5 is mounted at an opening of the anchor hole 3, a center hole jack 6 and a hydraulic extendable clamp 7 are mounted on an upper portion of the leveling base plate 5 sequentially, and the BFRP 4 penetrates the center hole jack 6 and the hydraulic extendable clamp 7 sequentially.
The BFRP 4 is then pre-stressed: a confining pressure value of the hydraulic extendable clamp 7 is set according to a design value of tensile strength of the basalt fiber anchor rod and a peripheral area of the BFRP 4, and the oil inlet amount of an oil inlet is adjusted to make the hydraulic extendable clamp 7 tightly hold the gripped BFRP. The center hole jack 6 is opened to integrally tension the BFRP 4. When the BFRP 4 is tensioned to a designed prestress value, the center hole jack 6 is locked.
Finally, anchor sealing treatment is performed on the BFRP 4: early-strength micro-expansion concrete slurry is injected into a space between the slurry baffle 8 and the grouting baffle 9 via a grouting pipe 901, and grouting is stopped until the injected early-strength micro-expansion concrete slurry overflows from an exhaust port 902. After the strength of the early-strength micro-expansion concrete reaches lockable strength, the center hole jack 6 and the hydraulic extendable clamp 7 are closed, and the hydraulic extendable clamp 7, the center hole jack 6, the leveling base plate 5 and the grouting baffle 9 are sequentially taken down. The BFRP is cut along an upper surface of a concrete hole plug 11, such that simple and rapid anchor sealing treatment is achieved.
Herein, the involved orientation terms such as “front”, “rear”, “upper”, and “lower” are defined in terms of the positions of parts and between the parts in the drawings, which are used just for clarity and convenience of expressing the technical solution. It should be understood that they are relative concepts and may vary accordingly according to different ways of use and placement, and the use of such parties should not limit the scope of protection of the claimed application.
The above examples and the features in the examples herein may be combined with each other in a non-conflicting situation.
The above descriptions are merely preferred examples of the present disclosure, and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, and the like made within the spirit and principle of the present disclosure shall be all included in the protection scope of the present disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202111345981.X | Nov 2021 | CN | national |
