CN216950436U - Shear-resistant grouting anchor rod for bedding developing rock mass - Google Patents
Shear-resistant grouting anchor rod for bedding developing rock mass Download PDFInfo
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- CN216950436U CN216950436U CN202123180171.1U CN202123180171U CN216950436U CN 216950436 U CN216950436 U CN 216950436U CN 202123180171 U CN202123180171 U CN 202123180171U CN 216950436 U CN216950436 U CN 216950436U
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- anchor rod
- grouting
- anchor
- rod body
- carbon fiber
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
A novel shear-resistant grouting anchor rod for a bedding developing rock body comprises an expansion shell anchor head (1), a carbon fiber strip (2), an anchor rod body (3), a base plate (4), a grouting bag (5), a nut (6) and a grouting hole (7). The expansion shell anchor head is arranged at one end of the anchor rod body; the other end of the anchor rod body is provided with a backing plate, a grouting bag is arranged on the backing plate, and the grouting bag and a grouting hole of the anchor rod body form a pipeline; the anchor rod body is a prestressed hollow grouting anchor rod, and carbon fiber strips are distributed on the periphery of the anchor rod; the stock body has evenly set up a plurality of vertical slip casting holes along length direction. According to the utility model, the carbon fiber strips with extremely strong tensile and shearing resistance are adhered to the surface of the free section rod body of the expansion shell type grouting anchor rod, so that the shearing resistance of the anchor rod is greatly improved, but the completeness and the plumpness of grouting between the anchor rod and a rock wall are not influenced, and the anchoring strength of the anchor rod is ensured.
Description
Technical Field
The utility model relates to a shear-resistant grouting anchor rod for a bedding developing rock mass, and belongs to the technical field of geotechnical engineering support.
Background
The anchor bolt support is widely applied to the field of underground engineering construction due to the advantages of good support effect, low cost, simple and convenient operation, small occupied construction space and the like; the anchor rod is mainly made of metal materials or metal materials and inorganic materials, and the anchor rod is characterized by being capable of bearing large tensile stress, but low in transverse bearing capacity and poor in shearing resistance; however, with the increase of the excavation depth of underground engineering and the influence of bedding development surrounding rocks, the horizontal stress is often greater than the vertical stress, which means that the failure mode of the anchor rod can also generate shearing failure along bedding surfaces or sliding surfaces besides the breaking failure, so that measures are very necessary to enhance the shearing resistance of the anchor rod in order to ensure the normal use of the anchor rod.
Aiming at the problem that the existing anchor rod is not strong in shearing resistance, domestic and foreign scholars develop different kinds of shearing resistant anchor rods, and can roughly divide the shearing resistant anchor rods into two types according to the working principle: the first type is a flexible shear-resistant anchor rod with a steel strand adopted by a rod body, the shear-resistant performance of the steel strand is fully utilized by the anchor rod, the anchor rod can be bent and coiled, the length of the anchor rod cannot be limited, but the anchoring section of the flexible anchor rod is also relatively soft and cannot go deep into surrounding rock to be anchored. The second type is that some special mechanical structures are arranged in the anchor rod, and the mechanical structures are utilized to be prior to the deformation of the anchor rod, so that the shearing force of a part of rock strata is consumed, the elongation rate and the shearing resistance of the anchor rod are increased, and the anchor rod has the defects that the deformation is asynchronous, and the integral shearing resistance is still required to be improved.
Disclosure of Invention
The utility model aims to provide a shear-resistant slip casting anchor rod for a bedding developing rock mass, aiming at the problem that the existing anchor rod is not strong in shear resistance.
The technical scheme of the utility model is that the shear-resistant grouting anchor rod for the bedding developing rock mass comprises a shell expansion anchor head, a carbon fiber strip, an anchor rod body, a base plate and a grouting bag. The expansion shell anchor head is arranged at one end of the anchor rod body; the other end of the anchor rod body is provided with a backing plate, a grouting bag is arranged on the backing plate, and the grouting bag and a grouting hole of the anchor rod body form a pipeline; the anchor rod body is a prestressed hollow grouting anchor rod, and carbon fiber strips are distributed on the periphery of the anchor rod; the stock body has evenly set up a plurality of vertical slip casting holes along length direction.
The thickness of the carbon fiber strip is 0.167mm, and the width of the carbon fiber strip is 70 central angles0A corresponding circumference; 4 carbon fiber strips are stuck on one anchor rod. The carbon fiber strip is connected with the anchor rod body by adopting an adhesive which is impregnating resin, and the carbon fiber strip is coated with the adhesive and then is rolled for many times along the fiber direction to extrude out air bubbles.
The anchor rod is a phi 25 expanding shell type prestress hollow grouting anchor rod, the material is Q420, and the wall thickness of the rod body is 5 mm.
The diameter of the grouting hole 5 of the anchor rod is 5mm, and the grouting pressure is 0.5-1.0 Mpa.
The bolt may be pre-stressed by tightening the nut.
The utility model has the following beneficial effects: according to the utility model, the carbon fiber strips with extremely strong tensile and shearing resistance are adhered to the surface of the free section rod body of the expansion shell type grouting anchor rod, so that the shearing resistance of the anchor rod is greatly improved, but the completeness and the plumpness of grouting between the anchor rod and a rock wall are not influenced, and the anchoring strength of the anchor rod is ensured; in addition, the components adopted by the utility model are conventional components, the structure is simple, the installation and construction steps are few, the cost is low, and the method can be widely applied to rock stratums with different geological conditions.
Drawings
FIG. 1 is a schematic structural view of the present invention; FIG. 2 is a sectional view taken along line A-A of FIG. 1;
in the figure, 1 is an expanding shell anchor head; 2 is a carbon fiber strip; 3 is an anchor rod body; 4 is a backing plate; 5 is a grouting bag; 6 is a nut; and 7, grouting holes.
Detailed Description
As shown in fig. 1, the novel shear-resistant grouting anchor rod for bedding developmental rock comprises an expansion shell anchor head 1, carbon fiber strips 2, an anchor rod body 3, a base plate 4, a grouting bag 5, a nut 6 and a grouting hole 7.
The shear-resistant anchor rod is a phi 25 expanding-shell type prestressed hollow grouting anchor rod, the material is Q420, and the wall thickness of a rod body is 5 mm; the grouting bag 5 and the grouting holes 7 on the rod body form a complete grouting channel, the size of the grouting holes 5 is 5mm, and the grouting pressure is 0.5-1.0 Mpa.
As shown in fig. 2, the carbon fiber strips 2 are adhered to the surface of the free section of the anchor rod by impregnating resin, and after the adhesive is coated, the carbon fiber strips are rolled for multiple times along the fiber direction to extrude bubbles; the carbon fiber strip 2 has a thickness of 0.167mm and a width of a central angle of 700And 4 carbon fiber strips 2 with the specifications are adhered to one anchor rod correspondingly to the circumference.
The embodiment of the utility model provides a field implementation method of a novel shear-resistant grouting anchor rod for a bedding developing rock body, which comprises the following steps:
step 1: drilling an anchor hole slightly larger than the outer diameter of the anchor rod on the surrounding rock and cleaning the hole;
and 2, step: connecting the expansion shell anchor head 1 with an anchor rod body 3, and then adhering four carbon fiber strips 2 on the surface of the anchor rod body;
and step 3: the rod body with the expansion shell anchor head 1 and the carbon fiber strip 2 is connected to the bottom of the pore-forming hole. A special tool is adopted to screw the rod body with force, so that the shell-expanding anchor head 1 is expanded in the anchor hole fully;
and 4, step 4: installing a base plate 4, a grouting bag 5 and a nut 6, and applying prestress to the anchor rod to a designed value by screwing the nut 6;
and 5: and (4) connecting the grouting pipe into the grouting bag 5, and starting the grouting machine until the grout flows out from the tail end of the anchor rod and the grouting pressure reaches the designed value.
Claims (4)
1. A shear-resistant grouting anchor rod for a bedding developing rock body is characterized by comprising a shell expansion anchor head, a carbon fiber strip, an anchor rod body, a base plate and a grouting bag; the expansion shell anchor head is arranged at one end of the anchor rod body; the other end of the anchor rod body is provided with a backing plate, a grouting bag is arranged on the backing plate, and the grouting bag and a grouting hole of the anchor rod body form a pipeline; the anchor rod body is a prestressed hollow grouting anchor rod, and carbon fiber strips are distributed on the periphery of the anchor rod; the stock body has evenly set up a plurality of vertical slip casting holes along length direction.
2. A shear grouting bolt for bedding developing rock mass as claimed in claim 1, wherein the carbon fibre strips are 0.167mm thick and 70 mm wide at the central angle0A corresponding circumference; 4 carbon fiber strips are stuck on one anchor rod.
3. A shear inducing grout bolt for bedding developing rock mass as claimed in claim 1 wherein the size of the grout hole 5 is 5 mm.
4. A shear grouting bolt for bedding rock mass as claimed in claim 1, wherein the bolt is a phi 25 expanding shell type prestressed hollow grouting bolt, the wall thickness of the bolt body is 5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123180171.1U CN216950436U (en) | 2021-12-17 | 2021-12-17 | Shear-resistant grouting anchor rod for bedding developing rock mass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123180171.1U CN216950436U (en) | 2021-12-17 | 2021-12-17 | Shear-resistant grouting anchor rod for bedding developing rock mass |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216950436U true CN216950436U (en) | 2022-07-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123180171.1U Active CN216950436U (en) | 2021-12-17 | 2021-12-17 | Shear-resistant grouting anchor rod for bedding developing rock mass |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216950436U (en) |
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2021
- 2021-12-17 CN CN202123180171.1U patent/CN216950436U/en active Active
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