CN115288469A - Prestressed tailless negative pressure filling grouting anchoring structure and anchoring method for top of stone cave temple - Google Patents
Prestressed tailless negative pressure filling grouting anchoring structure and anchoring method for top of stone cave temple Download PDFInfo
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- CN115288469A CN115288469A CN202210009714.3A CN202210009714A CN115288469A CN 115288469 A CN115288469 A CN 115288469A CN 202210009714 A CN202210009714 A CN 202210009714A CN 115288469 A CN115288469 A CN 115288469A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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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
The invention discloses a prestressed tailless negative-pressure filling grouting anchoring structure and method for the top of a stone cave temple, wherein the structure comprises an anchor rod hole and an anchor rod assembly, the anchor rod hole comprises a hole opening section and a hole body section which are mutually communicated, the hole diameter of the hole opening section is gradually reduced from bottom to top, the anchor rod assembly comprises an anchor rod body, a wedge-shaped anchor head and a base plate, the anchor rod body is of a hollow structure, the anchoring end of the anchor rod body is provided with a wedge-shaped part, and the wedge-shaped anchor head is matched with the wedge-shaped part; the backing plate is fixed at the tail part of the anchor rod body through a nut; the outer ring of the base plate is in close contact with the inner wall of the orifice section; the anchor rod hole is filled with grouting body at the part above the backing plate, the anchor rod hole is provided with an anchor sealing body at the part below the backing plate, and the tail part of the anchor rod body is embedded in the anchor sealing body. The invention can prevent the leakage of grouting, the anchor rod hole is pumped to negative pressure by the vacuum pump in the grouting process so as to ensure smooth grouting, and the tail part of the anchor rod body is completely embedded in the anchor sealing body, so that the appearance of the surface of the stone cave temple cannot be changed.
Description
Technical Field
The invention relates to the technical field of surrounding rock reinforcement of the top of a stone cave temple, in particular to a prestressed tailless negative-pressure filling grouting anchoring structure and method for the top of the stone cave temple.
Background
The anchor bolt support is a technology for anchoring an anchor bolt body in a rock mass by using grout and reinforcing the rock mass by using tensile strength of the bolt body, actively supports the rock mass by applying prestress to improve the reinforcing effect, is widely applied to projects such as mine side slopes, tunnels, dam bodies and the like, and is also a common reinforcing method for stone cave temple surrounding rocks.
The traditional construction steps are similar to the construction method of the prestressed full-length anchoring anchor cable based on the common anchor cable construction disclosed in the Chinese application patent CN104653206A at present, and the construction method comprises the following steps: drilling holes at the hole positions by using an anchor rod drilling machine; a large water gate is opened for hole cleaning by the anchor rod drilling machine; jacking the resin anchoring agent into the hole by using an anchor cable anchoring end, so that the anchor rod drilling machine can push the anchor cable and stir the resin anchoring agent by rotating the anchor cable; installing an anchor cable grouting plug on the anchor cable anti-seepage sleeve, installing an anchor cable tray on the anchor cable grouting plug, arranging a grouting hole on the anchor cable tray, installing an anchor cable lock on the anchor cable tray, penetrating one end of a grouting pipe into the grouting hole, and pressurizing the anchor cable lock by using an anchor cable tensioning machine; and when the grout flows out of the central end face of the non-anchoring end of the anchor cable, stopping grouting and finishing grouting operation.
The above anchoring method has the following drawbacks: 1) When the top of the stone cave temple is supported by an anchor rod, grout needs to be injected into the anchor rod hole by a grout injector, and due to the fact that the opening of the anchor rod is not tightly sealed, the grout can flow out of the anchor rod hole under the action of gravity, so that the grout is not densely filled, the anchoring force is reduced, underground water leakage can occur in the anchor rod hole at the later stage, and the stone cave is not protected; 2) An exhaust pipe is required to be attached to the anchor rod body, the exhaust pipe is not easy to arrange when the diameter of the anchor rod hole is small, the exhaust pipe is often omitted in construction, air in the anchor rod hole cannot be smoothly discharged during grouting, and the grouting effect is influenced; 3) When conventional stock was used for cave temple top to consolidate, the stock afterbody exposes in the rock mass, has changed the surface appearance of cave temple, influences the sightseeing degree of cave temple.
Disclosure of Invention
The invention aims to provide a prestressed tailless negative pressure filling grouting anchoring structure and method for the top of a stone cave temple, and aims to solve the problems that air in a grouting hole cannot be smoothly discharged and the tail of an anchor rod is exposed out of a rock body due to slurry leakage and inconvenient arrangement of an exhaust pipe in the traditional anchoring method.
In order to realize the technical purpose, the invention adopts the following technical scheme:
the invention relates to a prestressed tailless negative pressure filling grouting anchoring structure for the top of a stone cave temple, which comprises an anchor rod hole and an anchor rod assembly; the anchor rod hole comprises a hole opening section and a hole body section which are communicated with each other, the aperture of the hole opening section is larger than the diameter of the hole body section, and the aperture of the hole opening section is gradually reduced from bottom to top; the anchor rod assembly comprises an anchor rod body, a wedge-shaped anchor head and a base plate, wherein the anchor rod body is of a hollow structure and is used for connecting a vacuum pump in a grouting process, so that a negative pressure environment is formed in an anchor rod hole; the anchoring end of the anchor rod body is provided with a wedge-shaped part, a wedge-shaped anchor head is matched with the wedge-shaped part, and the wedge-shaped anchor head is used for fixing the anchoring end of the anchor rod body on the top of the anchor rod hole; the base plate is fixed at the tail part of the anchor rod body through a nut, and the nut is also used for applying prestress to the anchor rod body; the outer ring of the base plate is in close contact with the inner wall of the orifice section, and the base plate is used for preventing the slurry leakage phenomenon in the grouting process; the anchor rod is characterized in that the part, located above the base plate, in the anchor rod hole is filled with grouting bodies, the part, located below the base plate, in the anchor rod hole is provided with an anchor sealing body, and the tail of the anchor rod body is completely embedded in the anchor sealing body.
Preferably, the length of the shank is at least 50mm less than the depth of the bore.
Preferably, the backing plate is located in the middle of the orifice section.
Preferably, wedge anchor head include two wedge pieces and connect the bridge, the top of two wedge pieces is through connecting bridge interconnect, the lateral surface of wedge piece is equipped with the barb, the aperture of the external diameter ratio aperture section of wedge anchor head 5mm big.
Preferably, the backing plate is provided with a central hole and a grouting pipe hole; the tail part of the anchor rod body penetrates through the central hole, and the outer surface of the tail part of the anchor rod body is provided with an external thread which is used for screwing a nut; the grouting pipe hole is used for being connected with a grouting pipe in a threaded mode so as to achieve construction of grouting bodies.
Preferably, the orifice section has a depth of 100mm.
Preferably, the diameter of the backing plate is 100-150 mm, and the thickness is 10mm.
The invention also relates to an anchoring method based on the stone cave temple top prestress tailless negative pressure filling grouting anchoring structure, which comprises the following steps:
1) Drilling an anchor rod hole: drilling a hole body section at the surrounding rock at the top of the stone cave temple by using a drilling machine, and expanding the hole opening of the hole body section by using a conical drill bit to form a hole opening section with the gradually reduced hole diameter from bottom to top;
2) And (3) installing an anchor rod body: sleeving a wedge-shaped anchor head at a wedge-shaped part at the anchoring end of an anchor rod body, installing an extension pipe at the tail end of the anchor rod body, enabling the total length of the extension pipe and the anchor rod body to be greater than the depth of an anchor rod hole, pushing the anchor rod body into the anchor rod hole, enabling the wedge-shaped anchor head to be clamped at the top of the anchor rod hole, and detaching the extension pipe;
3) Applying prestress: installing a base plate to the tail of the anchor rod body, screwing a nut to the tail of the anchor rod body to enable the base plate to ascend until an outer ring of the base plate is completely sealed with the side wall of the orifice section and the base plate cannot ascend continuously, and continuously screwing the nut to apply prestress to the anchor rod body;
4) Installing a grouting pipe and a grouting machine: a grouting pipe is arranged on the base plate, a grouting opening at the upper end of the grouting pipe is positioned above the base plate, and the bottom of the grouting pipe is connected with a grouting machine;
5) Connecting a vacuum pump: the tail part of the anchor rod body is connected with a vacuum pump, and the vacuum pump is communicated with the hollow part of the anchor rod body;
6) Vacuumizing and grouting: starting a vacuum pump to pump out air in the anchor rod hole above the base plate so as to form negative pressure, opening a grouting machine to perform grouting, filling the anchor rod hole above the base plate with grout from bottom to top until the grout overflows from the hollow part of the anchor rod body, closing the vacuum pump and the grouting machine, and removing a grouting pipe and plugging the grouting hole on the base plate after the grout is finally solidified to form grouting body;
7) And (3) anchor sealing construction: and constructing an anchor sealing body by using impervious mortar, and sealing the orifice section below the backing plate.
Preferably, after the extension pipe is installed at the tail end of the anchor rod body in the step 2), the extension pipe extends out of the hole opening section by at least 5mm; the outer surface of the tail part of the anchor rod body is provided with external threads, and a nut for lifting a base plate and applying prestress to the anchor rod body is in threaded connection with the anchor rod body through the external threads; one end of the extension pipe is provided with an internal thread matched with the external thread, and the extension pipe is in threaded connection with the tail part of the anchor rod body.
Preferably, the grouting pipe comprises an outer pipe, a valve and an inner pipe, the outer pipe is fixed at the bottom end of the inner pipe, and the valve is arranged at the inner pipe; and the outer side of the inner pipe is also provided with an external thread which is used for being in threaded connection with the base plate.
The technical scheme of the invention has the following characteristics and beneficial effects:
1. the prestressed tailless negative pressure filling grouting anchoring structure at the top of the stone cave temple, disclosed by the invention, has the advantages that the anchor rod body is set to be a hollow structure, a vacuum pump is connected to the tail part of the anchor rod body during grouting, and air in the anchor rod hole is pumped away by using the vacuum pump to replace the traditional exhaust pipe for exhausting air, so that the problem of difficult installation of the exhaust pipe caused by the undersize pore diameter of the anchor rod hole can be avoided, the negative pressure environment is formed in the anchor rod hole during grouting, and the grouting is smoothly carried out.
2. The invention relates to a prestressed tailless negative pressure filling grouting anchoring method for the top of a stone cave temple, wherein in the grouting process, grout is injected into an anchor rod hole by adopting a bottom-up counter pressure filling technology, the grout in the anchor rod hole firstly fills and compacts an orifice section, the grout filled later jacks the grout filled firstly to the top of the anchor rod hole, and the grout filling is carried out by adopting the mode so that the fullness of the grout is high, the anchoring effect is improved, and the water seepage of the anchor rod hole is avoided.
3. The invention relates to an anchor rod hole of a prestressed tailless negative pressure filling grouting anchoring structure at the top of a stone cave temple, which comprises an orifice section and a bore section which are mutually communicated, wherein the bore diameter of the orifice section is gradually reduced from bottom to top, an anchor rod assembly comprises an anchor rod body and a base plate, the outer ring of the base plate is tightly contacted with the inner wall of the orifice section, the base plate can prevent slurry leakage in the grouting process, the slurry is tightly filled, the anchoring force is strong, and the problem of underground water leakage cannot occur in the anchor rod hole at the later stage.
4. According to the prestressed tailless negative pressure filling grouting anchoring method for the top of the stone cave temple, when the anchor rod body is installed, the extension pipe is installed at the tail end of the anchor rod body, the anchor rod body is installed in the anchor rod hole, and then the extension pipe is dismantled, so that the tail of the anchor rod body after being sealed is completely buried in the sealed anchor body, the surface appearance of the stone cave temple cannot be changed, and the visibility of the stone cave temple cannot be influenced.
Drawings
FIG. 1 is a schematic structural view of a prestressed tailless negative pressure filling grouting anchoring structure at the top of a stone cave temple;
FIG. 2 is a schematic view of the construction of the anchor rod assembly with the extension tube attached;
FIG. 3 is a bottom view of the backing plate;
FIG. 4 is a schematic structural view of a wedge-shaped anchor head;
FIG. 5 is a schematic construction view of the anchor assembly after being disposed in the anchor hole;
FIG. 6 is a schematic view of a grouting process;
fig. 7 is a detailed view of the construction of the grout pipe.
Description of reference numerals: 1-anchor rod component, 11-anchor rod body, 12-backing plate, 13-nut, 14-extension pipe, 121-center hole, 122-grouting pipe hole, 2-wedge-shaped anchor head, 21-wedge-shaped piece, 22-connecting bridge, 23-barb, 3-grouting pipe, 31-outer pipe, 32-valve, 33-inner pipe, 34-external thread, 41-orifice section, 42-hole body section, 5-surrounding rock, 6-grouting body, 7-sealing anchor body and 8-vacuum pump.
Detailed Description
The present invention is described in detail below, and technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to the attached figure 1, the prestressed tailless negative pressure filling grouting anchoring structure for the top of the stone cave temple, disclosed by the invention, comprises an anchor rod hole and an anchor rod assembly 1. The anchor rod hole comprises an orifice section 41 and a hole body section 42 which are communicated with each other, the aperture of the orifice section 42 is larger than the diameter of the hole body section 41, and the aperture of the orifice section 42 is gradually reduced from bottom to top; the anchor rod assembly 1 comprises an anchor rod body 11, a wedge-shaped anchor head 2 and a backing plate 12.
Referring to fig. 1 and 2, the anchor rod body 11 is made of a medium-hole steel pipe, the length of the anchor rod body 11 is at least 50mm smaller than the depth of an anchor hole, the anchoring end of the anchor rod body 11 is provided with a wedge-shaped part, a wedge-shaped anchor head 2 is matched with the wedge-shaped part, the outer surface of the tail part of the anchor rod body 11 is provided with an external thread, and the external thread is used for screwing a nut 13 and connecting a connecting pipe 14 when the anchor rod body 11 is inserted into the anchor hole; referring to fig. 4, wedge anchor head 2 includes two wedge pieces 21 and connecting bridge 22, and connecting bridge 22 interconnect is passed through at the top of wedge piece 21, and the lateral surface of wedge piece 21 is equipped with barb 23, wedge anchor head 2's the aperture of external diameter than the aperture section big 5mm, during the use, establish the wedge part at the anchor rod body 11 anchor end with wedge anchor head 2 cover, when the anchor rod body 11 inserts the anchor rod hole, wedge anchor head 2 is pushed up to the hole bottom in anchor rod hole, is blocked by surrounding rock 5 all around, then draws down the anchor rod body 11, and the anchor rod body 11 moves down, and wedge part and wedge anchor head 2 extrusion, wedge anchor head 2 outwards expand, cooperates barb 23 of wedge piece 21 lateral surface, further promotes the frictional force of wedge anchor head 2 and surrounding rock 5.
Referring to fig. 1 to 3, the diameter of the backing plate is 100 to 150mm, the thickness is about 10mm, the backing plate 12 is located in the middle of the orifice section, the backing plate 12 is provided with a center hole 121 and a grouting pipe hole 122, the tail of the anchor rod body 11 penetrates through the center hole 121, the backing plate 12 is fixed at the tail of the anchor rod body 11 through a nut 13, the nut 13 is used for lifting the height of the backing plate 12, so that the outer ring of the backing plate 12 is in close contact with the inner wall of the orifice section 51, the slurry leakage phenomenon in the grouting process is prevented, and the nut 13 is also used for applying prestress to the anchor rod body 11. The grouting pipe hole 123 is used for being in threaded connection with a grouting pipe, and the grouting pipe hole is plugged after grouting construction is completed.
The part of the anchor rod hole above the backing plate 12 is filled with grouting material 6, the part of the anchor rod hole below the backing plate 12 is provided with an anchor sealing body 7, and the tail part of the anchor rod body 11 is buried in the anchor sealing body 7.
The prestressed tailless negative pressure filling grouting anchoring method for the top of the stone cave temple comprises the following steps:
1) Drilling an anchor rod hole: drilling a hole body section 42 in a surrounding rock 5 at the top of a stone cave temple by using a drilling machine according to design requirements, cleaning the hole body section 42 after hole forming, and then expanding an orifice of the hole body section 42 by using a conical drill bit to form an orifice section 41 with gradually reduced aperture from bottom to top;
2) The anchor rod body 11 is installed: sleeving a wedge-shaped anchor head 2 at a wedge-shaped part at the anchoring end of an anchor rod body 11, installing an extension pipe 14 at the tail end of the anchor rod body 11, so that the total length of the extension pipe 14 and the anchor rod body 11 is greater than the depth of an anchor rod hole, after the extension pipe 14 is installed at the tail end of the anchor rod body 11, extending the extension pipe 14 out of the hole opening section by at least 5mm, arranging external threads on the outer surface of the tail part of the anchor rod body 11, arranging internal threads matched with the external threads at one end of the extension pipe 14, and connecting the extension pipe 14 with the tail part of the anchor rod body 11 in a threaded manner; pushing the anchor rod body 11 into the anchor rod hole to enable the wedge-shaped anchor head 2 to be clamped at the top (hole bottom) of the anchor rod hole, enabling the wedge-shaped anchor head 2 to be clamped by surrounding rocks 5 around after being pushed to the hole bottom of the anchor rod hole, then pulling the anchor rod body 11 downwards, enabling the anchor rod body 11 to move downwards, enabling the wedge-shaped part to be extruded with the wedge-shaped anchor head 2, enabling the wedge-shaped anchor head 2 to expand outwards to match with an agnail 23 on the outer side face of a wedge-shaped piece 21 to improve the friction force between the wedge-shaped anchor head 2 and the surrounding rocks 5 and further improve the anchoring force of the anchor rod body 11, and as shown in figure 5, at the moment, a gap exists between the top of the anchor rod body 11 and the bottom face of a connecting bridge 22 of the wedge-shaped anchor head 2, and air can be conveniently discharged from the anchor rod body 11; the lengthening pipe 14 is removed after the anchor rod body 11 is installed;
3) Applying prestress: installing a backing plate 12 to the tail part of the anchor rod body 11, screwing a nut 13 to the tail part of the anchor rod body 11 by using a pneumatic or hydraulic wrench, wherein the nut 13 is in threaded connection with the anchor rod body 11 through external threads at the tail part of the anchor rod body 11, in the process of screwing the nut, the backing plate rises until the outer ring of the backing plate is completely sealed with the side wall of the orifice section and the backing plate cannot rise continuously, and continuously screwing the nut to apply prestress to the anchor rod body;
4) Installing a grouting pipe 3 and a grouting machine: the grouting pipe 3 is installed on the backing plate, and as shown in fig. 7, the grouting pipe 3 comprises an outer pipe 31, a valve 32 and an inner pipe 33, the outer pipe 31 is fixed at the bottom end of the inner pipe 33, and the valve 32 is installed at the inner pipe 32; the outer side of the inner pipe 33 is also provided with an external thread 34 for threaded connection with the backing plate 12; the grouting opening at the upper end of the grouting pipe 3 is positioned above the backing plate, and the bottom of the grouting pipe 3 is connected with a grouting machine;
5) Connecting a vacuum pump: the tail part of the anchor rod body 11 is connected with a vacuum pump 8, and the vacuum pump 8 is communicated with the hollow part of the anchor rod body to form a structure shown in fig. 6;
6) Vacuumizing and grouting: starting a vacuum pump 8 to pump out air in the anchor rod hole above the backing plate 12 to form negative pressure, opening a grouting machine to perform grouting, filling the anchor rod hole above the backing plate 12 with grout from bottom to top until the grout overflows from the hollow part of the anchor rod body, closing the vacuum pump 8 and the grouting machine, removing a grouting pipe 3 and the vacuum pump 8 after the grout is finally set to form a grouting body 6, and plugging the grouting hole on the backing plate 12;
7) And (3) anchor sealing construction: and constructing the sealing anchor body 7 by using impervious mortar, and sealing the orifice section below the backing plate 13.
The present invention has been described in detail with reference to the embodiments, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. The utility model provides a cave temple top prestressing force does not have tail negative pressure and fills slip casting anchor structure which characterized in that: the anchor rod assembly comprises an anchor rod hole and an anchor rod assembly; the anchor rod hole comprises a hole opening section and a hole body section which are mutually communicated, the hole diameter of the hole opening section is larger than the diameter of the hole body section, and the hole diameter of the hole opening section is gradually reduced from bottom to top; the anchor rod assembly comprises an anchor rod body, a wedge-shaped anchor head and a base plate, wherein the anchor rod body is of a hollow structure and is used for connecting a vacuum pump in a grouting process, so that a negative pressure environment is formed in an anchor rod hole; the anchoring end of the anchor rod body is provided with a wedge-shaped part, a wedge-shaped anchor head is matched with the wedge-shaped part, and the wedge-shaped anchor head is used for fixing the anchoring end of the anchor rod body on the top of the anchor rod hole; the backing plate is fixed at the tail part of the anchor rod body through a nut, and the nut is also used for applying prestress to the anchor rod body; the outer ring of the base plate is in close contact with the inner wall of the orifice section, and is used for preventing the slurry leakage phenomenon in the grouting process; the anchor rod is characterized in that the part, located above the base plate, in the anchor rod hole is filled with grouting bodies, the part, located below the base plate, in the anchor rod hole is provided with an anchor sealing body, and the tail part of the anchor rod body is completely embedded in the anchor sealing body.
2. The cave temple top prestressing no-tail negative pressure filling slip casting anchor structure of claim 1, characterized in that: the length of the anchor rod body is at least 50mm smaller than the depth of the anchor rod hole.
3. The cave temple top prestressing no-tail negative pressure filling slip casting anchor structure of claim 1, characterized in that: the backing plate is positioned in the middle of the orifice section.
4. The cave temple top prestressing no-tail negative pressure filling slip casting anchor structure of claim 1, characterized in that: the wedge anchor head include two wedge pieces and connect the bridge, the top of two wedge pieces is through connecting bridge interconnect, the lateral surface of wedge piece is equipped with the barb, the aperture of the external diameter ratio aperture section of wedge anchor head big 5mm.
5. The grotto temple top prestressing force nothing tail negative pressure filling slip casting anchor structure of claim 1, characterized in that: the base plate is provided with a central hole and a grouting pipe hole; the tail part of the anchor rod body penetrates through the central hole, and the outer surface of the tail part of the anchor rod body is provided with an external thread which is used for screwing a nut; the grouting pipe hole is used for being in threaded connection with a grouting pipe so as to achieve the construction of grouting body.
6. The grotto temple top prestressing force nothing tail negative pressure filling slip casting anchor structure of claim 1, characterized in that: the depth of the orifice section is 100mm.
7. The cave temple top prestressing no-tail negative pressure filling slip casting anchor structure of claim 1, characterized in that: the diameter of the backing plate is 100-150 mm, and the thickness of the backing plate is 10mm.
8. An anchoring method based on the stone cave temple top prestress tailless negative pressure filling grouting anchoring structure of claim 1 is characterized in that: which comprises the following steps:
1) Drilling an anchor rod hole: drilling a hole body section at the surrounding rock at the top of the stone cave temple by using a drilling machine, and expanding the hole opening of the hole body section by using a conical drill bit to form a hole opening section with the gradually reduced hole diameter from bottom to top;
2) And (3) installing an anchor rod body: sleeving a wedge-shaped anchor head at a wedge-shaped part at the anchoring end of an anchor rod body, installing a lengthening tube at the tail end of the anchor rod body, enabling the total length of the lengthening tube and the anchor rod body to be greater than the depth of an anchor rod hole, pushing the anchor rod body into the anchor rod hole, enabling the wedge-shaped anchor head to be clamped at the top of the anchor rod hole, and detaching the lengthening tube;
3) Applying prestress: installing a base plate to the tail of the anchor rod body, screwing a nut to the tail of the anchor rod body to enable the base plate to ascend until an outer ring of the base plate is completely sealed with the side wall of the orifice section and the base plate cannot ascend continuously, and continuously screwing the nut to apply prestress to the anchor rod body;
4) Installing a grouting pipe and a grouting machine: a grouting pipe is arranged on the base plate, a grouting opening at the upper end of the grouting pipe is positioned above the base plate, and the bottom of the grouting pipe is connected with a grouting machine;
5) Connecting a vacuum pump: the tail part of the anchor rod body is connected with a vacuum pump, and the vacuum pump is communicated with the hollow part of the anchor rod body;
6) Vacuumizing and grouting: starting a vacuum pump to pump out air in the anchor rod hole above the base plate so as to form negative pressure, opening a grouting machine to perform grouting, filling the anchor rod hole above the base plate with grout from bottom to top until the grout overflows from the hollow part of the anchor rod body, closing the vacuum pump and the grouting machine, and removing a grouting pipe and plugging the grouting hole on the base plate after the grout is finally solidified to form grouting body;
7) And (3) anchor sealing construction: and constructing an anchor sealing body by using impervious mortar, and sealing the orifice section below the backing plate.
9. The anchoring method based on the stone cave temple top prestress tailless negative pressure filling grouting anchoring structure as claimed in claim 8, wherein: after the long extension pipe is installed at the tail end of the anchor rod body in the step 2), the long extension pipe extends out of the hole opening section by at least 5mm; the outer surface of the tail part of the anchor rod body is provided with external threads, and a nut for lifting a base plate and applying prestress to the anchor rod body is in threaded connection with the anchor rod body through the external threads; one end of the extension pipe is provided with an internal thread matched with the external thread, and the extension pipe is in threaded connection with the tail part of the anchor rod body.
10. The anchoring method based on the stone cave temple top prestress tailless negative pressure filling grouting anchoring structure as claimed in claim 8, wherein: the grouting pipe comprises an outer pipe, a valve and an inner pipe, the outer pipe is fixed at the bottom end of the inner pipe, and the valve is arranged at the inner pipe; and the outer side of the inner pipe is also provided with an external thread which is used for being in threaded connection with the base plate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210009714.3A CN115288469A (en) | 2022-01-06 | 2022-01-06 | Prestressed tailless negative pressure filling grouting anchoring structure and anchoring method for top of stone cave temple |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210009714.3A CN115288469A (en) | 2022-01-06 | 2022-01-06 | Prestressed tailless negative pressure filling grouting anchoring structure and anchoring method for top of stone cave temple |
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| CN115288469A true CN115288469A (en) | 2022-11-04 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1464176A (en) * | 2002-06-24 | 2003-12-31 | 吴德兴 | A pin timbering process and sectionalized hollow mud injecting stay bolt thereof |
| KR20080025902A (en) * | 2006-09-19 | 2008-03-24 | 황현주 | Rock bolt and fixation method the rock bolt |
| CN202596756U (en) * | 2012-01-01 | 2012-12-12 | 谢理想 | Shell-expanding high-strength grouting bolt |
| CN103133026A (en) * | 2013-03-26 | 2013-06-05 | 安徽理工大学 | Novel expansion shell inverted wedge type grouting anchor rod |
| CN110644484A (en) * | 2019-09-30 | 2020-01-03 | 中国水利水电第九工程局有限公司 | Construction method for prestressed anchor rod support of roof arch of underground plant |
-
2022
- 2022-01-06 CN CN202210009714.3A patent/CN115288469A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1464176A (en) * | 2002-06-24 | 2003-12-31 | 吴德兴 | A pin timbering process and sectionalized hollow mud injecting stay bolt thereof |
| KR20080025902A (en) * | 2006-09-19 | 2008-03-24 | 황현주 | Rock bolt and fixation method the rock bolt |
| CN202596756U (en) * | 2012-01-01 | 2012-12-12 | 谢理想 | Shell-expanding high-strength grouting bolt |
| CN103133026A (en) * | 2013-03-26 | 2013-06-05 | 安徽理工大学 | Novel expansion shell inverted wedge type grouting anchor rod |
| CN110644484A (en) * | 2019-09-30 | 2020-01-03 | 中国水利水电第九工程局有限公司 | Construction method for prestressed anchor rod support of roof arch of underground plant |
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