CN115045695A - Rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod - Google Patents
Rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod Download PDFInfo
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- CN115045695A CN115045695A CN202210522439.5A CN202210522439A CN115045695A CN 115045695 A CN115045695 A CN 115045695A CN 202210522439 A CN202210522439 A CN 202210522439A CN 115045695 A CN115045695 A CN 115045695A
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- grouting
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- 238000005520 cutting process Methods 0.000 title claims abstract description 36
- 239000011435 rock Substances 0.000 claims abstract description 83
- 238000004873 anchoring Methods 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000002347 injection Methods 0.000 claims abstract description 22
- 239000007924 injection Substances 0.000 claims abstract description 22
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- 238000005452 bending Methods 0.000 claims abstract description 4
- 238000013016 damping Methods 0.000 claims description 10
- 238000007569 slipcasting Methods 0.000 claims description 3
- 230000008093 supporting effect Effects 0.000 description 14
- 238000000034 method Methods 0.000 description 8
- 238000005336 cracking Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000004901 spalling Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 239000002002 slurry Substances 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/028—Devices or accesories for injecting a grouting liquid in a bore-hole
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/008—Anchoring or tensioning means
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0086—Bearing plates
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod. The anchor comprises an anchoring agent, an inner rod body, a middle sleeve, a hydraulic expansion shell and a tray; the inner rod body is a grouting anchor rod; the hydraulic expansion shell is formed by radially bending a steel pipe; one end of the inner rod body is provided with an anchoring agent, and the other end of the inner rod body is positioned in the middle sleeve; ribs are arranged on the inner rod body; both ends of the hydraulic expansion shell are welded on the middle sleeve; the water injection hole is arranged on the middle sleeve; the anchoring agent and the hydraulic expansion shell are both positioned in the drill hole; one end of the inner rod body and one end of the middle sleeve are located in the drill hole, and the other end of the inner rod body and the other end of the middle sleeve are fixed on a rock body through the nut and the tray. The invention has the advantages of simple structure, convenient use, wide application range and the like, and has the functions of simultaneously applying axial and radial prestress, large deformation, grouting and the like to the rod body.
Description
Technical Field
The invention relates to the technical field of rock-soil body anchoring, in particular to a rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod, which can apply axial and radial prestress to a rod body simultaneously, carry out grouting reinforcement on surrounding rocks, and ensure that a tray and the surfaces of the surrounding rocks are separated when the surrounding rocks are cracked, stripped or exploded, and the anchor rod still has a certain supporting function.
Background
As an active supporting mode, the prestressed anchor rod has the outstanding characteristic of rapidly providing supporting force compared with a common bonding anchor rod. By applying active prestress, the stress state of a rock body is favorably improved, the stress concentration degree of surrounding rocks is relieved, cracks in the surrounding rocks are promoted to be closed, and the cracks are restrained from expanding and communicating in time; the prestressed anchor rod applies a surface supporting force to surrounding rocks by means of the base plate, certain supporting surrounding pressure is provided for the surrounding rocks, and further the damage of the surrounding rocks can be effectively inhibited.
Therefore, it is necessary to develop a bolt which has a supporting force when the tray is detached from the surface of the surrounding rock.
Disclosure of Invention
The invention aims to provide a rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod which is simple in structure and convenient to use, has the functions of simultaneously applying axial and radial prestress, large deformation, grouting and the like, and is wide in application range; after the tray and the surrounding rock are separated, the hydraulic expansion shell is expanded and then is tightly attached to the hole wall, and certain friction force is provided, so that the axial direction of the rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod still has pre-tightening force, and continuous supporting force is provided for the surrounding rock; the anchor rod overcomes the defects that the existing anchor rod can not apply axial and radial prestress and large deformation and grouting simultaneously, and solves the problem that the anchoring force is invalid after the surface of the tray and the surrounding rock is hollowed.
In order to achieve the purpose, the technical scheme of the invention is as follows: a rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod is characterized in that: comprises an anchoring agent, an inner rod body, a middle sleeve, a hydraulic expansion shell and a tray;
the anchoring agent and the hydraulic expansion shell are both positioned in the drill hole;
one end of the middle sleeve is positioned in the drill hole, and the other end of the middle sleeve extends out of the drill hole and is fixed on a rock body through a nut and a tray;
the inner rod body is a grouting anchor rod;
one end of the inner rod body is fixed at the bottom of the drilled hole through an anchoring agent, and the other end of the inner rod body penetrates through the middle sleeve; ribs are arranged on the inner rod body; the rib is positioned in the middle sleeve;
the hydraulic expansion shell is formed by radially bending a steel pipe; the hydraulic expansion shell is positioned in the drill hole; the hydraulic expansion shell is sleeved on the periphery of the middle sleeve, and two ends of the hydraulic expansion shell are welded on the middle sleeve;
the water injection hole is arranged on the middle sleeve and is communicated with the hydraulic expansion shell;
a through hole structure is arranged in the middle sleeve; the through hole structure comprises a first through hole structure, a second through hole structure and a third through hole structure; the first through hole structure, the second through hole structure and the third through hole structure are communicated in sequence; the inner diameter of the third through hole structure is larger than that of the first through hole structure; the second through hole structure is an expanding structure; the inner diameter of one end of the second through hole structure is equal to that of the first through hole structure, and the inner diameter of the other end of the second through hole structure is equal to that of the third through hole structure;
the inner rod body is positioned in the first through hole structure; the ribs are positioned in the second through hole structure and the third through hole structure; the inner diameter of the first through hole structure is larger than or equal to the outer diameter of the inner rod body and smaller than the outer diameter of the rib;
the outer diameter of the rib is smaller than the inner diameter of the second through hole structure and smaller than the inner diameter of the third through hole structure.
In the technical scheme, the hydraulic expansion shell is installed in the drill hole after being compressed.
In the technical scheme, the hydraulic expansion shell is compressed into a flower shape or a wave shape and then is installed in the drill hole.
In the technical scheme, the damping gasket is arranged between the tray and the rock body and covers the drill hole;
the outer diameter of the damping shim is larger than the outer diameter of the bore hole.
In the above technical scheme, the grouting holes are formed in the inner rod body.
In the technical scheme, the grouting holes comprise grouting main holes and grouting branch holes;
the grouting main hole is of a through hole structure;
the grouting main hole is arranged inside the inner rod body;
one end of the grouting branch hole is communicated with the grouting main hole, and the other end of the grouting branch hole is arranged on the outer wall of the inner rod body.
In the technical scheme, the grouting main hole penetrates through the inner rod body; the length of the grouting main hole is equal to that of the inner rod body;
the grouting branch holes are arranged in a staggered manner.
The invention has the following advantages:
(1) the anchoring agent is used for providing anchoring force (namely, one end of the inner rod body is anchored in a drill hole through the anchoring agent), the damping gasket, the tray and the nut are used for providing axial pretightening force of the rod body, the hydraulic expansion shell after water injection expansion is used for providing radial pretightening force of the rod body, the axial pretightening force and the radial pretightening force of the rod body are simultaneously applied, and the function of large deformation of the anchor rod structure is realized by relative sliding of the middle sleeve and the inner rod body and cutting ribs on the inner rod body; after the tray and the surrounding rock are separated, the hydraulic expansion shell is expanded and then is tightly attached to the hole wall, and certain friction force is provided, so that the axial direction of the rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod still has pre-tightening force, and continuous supporting force is provided for the surrounding rock; the defects that the existing anchor rod cannot apply axial and radial prestress and large deformation of the rod body at the same time are overcome, and the problem that the anchoring force is invalid after the tray and the surface of the surrounding rock are separated is solved;
(2) after the surrounding rock is deformed, the anchor rod structure is elongated, and in the process of elongation, the ribs are cut off by the middle sleeve; in the cutting process, the whole anchor rod still has prestress, so that continuous supporting force is provided for surrounding rocks, and large deformation is realized;
(3) a large number of cracks can be generated in the large deformation process of the surrounding rock, the surrounding rock is reinforced by grouting through the grouting holes, and the integrity and the bearing capacity of the surrounding rock are improved.
Drawings
Fig. 1 is an axial structure schematic diagram of the rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod before water injection expansion.
Fig. 2 is a schematic view of the radial structure of the rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod before water injection expansion.
Fig. 3 is a schematic view of the connection structure of the middle sleeve, the ribs, the inner rod body and the hydraulic expansion shell in the invention.
Fig. 4 is an axial structure schematic diagram of the rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod after water injection expansion and large deformation.
Fig. 5 is a schematic view of the radial structure of the rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod after water injection expansion and large deformation.
Fig. 6 is a schematic axial structure diagram of the rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod after water injection expansion and large deformation when the surrounding rock surface is loosened.
Fig. 7 is an axial structure schematic diagram of the rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod after water injection expansion and large deformation when cracks exist on the surface of surrounding rock and the surface is hollow.
In fig. 6, B represents the surrounding rock surface void.
In FIG. 7, A represents a fissure; and B represents the surface void of the surrounding rock.
In the figure, 1-anchoring agent, 2-inner rod body, 3-drilling hole, 4-middle sleeve, 4.1-through hole structure, 4.11-first through hole structure, 4.12-second through hole structure, 4.13-third through hole structure, 5-hydraulic expansion shell, 6-rock mass, 7-damping gasket, 8-nut, 9-water injection hole, 10-tray, 11-rib, 12-water, 13-grouting hole, 13.1-grouting main hole and 13.2-grouting branch hole.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are not intended to limit the present invention, but are merely exemplary. While the advantages of the invention will be clear and readily understood by the description.
The prior publication number is CN113123817, a large-deformation prestressed hydraulic expansion anchor rod is a patent application applied by the applicant of the present application on the 29/04/2021, and the applicant finds in subsequent researches that the patent application with the publication number of CN113123817 integrally fixes the anchor rod in a drill hole through a nut in the working process as an axial fixing force to prevent the anchor rod from falling out of the drill hole; the inner pushing head and the hydraulic expansion inner shell provide axial fixing force simultaneously through friction and deformation of the hydraulic expansion inner shell; after water injection, hydraulic expansion shell expansion, deformation of the hydraulic expansion inner shell and injected water body pressure are simultaneously applied to the inner wall of the drill hole to provide radial fixing force; but the end parts of the hydraulic expansion inner shell and the hydraulic expansion outer shell are not bonded with the bottom of the drilled hole, when the tray and the surrounding rock surface are separated, under the condition that the tray and the nut are separated, the anchor rod and the nut have no force application point and the anchoring force is invalid after the tray and the surrounding rock surface are separated. The invention aims to solve the problem that the anchoring force is invalid after the tray and the surface of the surrounding rock are separated in the patent application with the publication number of CN 113123817. The anchor rod is integrally fixed in the drill hole through the nut, and the inner rod is bonded to the bottom of the hole through the adhesive and used as axial fixing force to prevent the anchor rod from falling out of the drill hole; after water is injected, the middle sleeve 4 is tightly attached to the inner rod body 2 under the action of water to provide axial fixing force; after water injection, the hydraulic expansion shell 5 deforms and expands to be applied to the inner wall of the drill hole, and radial fixing force is provided. When the tray and the surface of the surrounding rock are emptied, the inner rod body 2, the middle sleeve 4 and the hydraulic expansion shell 5 form a whole with the drill hole under the action of the anchoring agent and the water body, and even if the nut 8 is loosened, the inner rod body 2, the middle sleeve 4 and the hydraulic expansion shell 5 which are taken as a whole cannot be loosened, and axial and radial forces are still exerted on the drill hole. Meanwhile, grouting reinforcement can be performed on cracks generated in the large deformation process of the surrounding rock, and the integrity and the bearing capacity of the surrounding rock are improved.
With reference to the accompanying drawings: a rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod comprises an anchoring agent 1, an inner rod body 2, a middle sleeve 4, a hydraulic expansion shell 5 and a tray 10;
the anchoring agent 1 and the hydraulic expansion shell 5 are both positioned in the borehole 3;
one end of the middle sleeve 4 is positioned in the drill hole 3, and the other end of the middle sleeve extends out of the drill hole 3 and is fixed on the rock body 6 through a nut 8 and a tray 10; the axial prestress application of the rod body is completed through the tray 10 and the nut 8, and meanwhile, the axial and radial prestress application of the anchor rod body is realized;
the inner rod body 2 is a grouting anchor rod;
one end of the inner rod body 2 is fixed at the bottom of the drilled hole 3 through the anchoring agent 1, and the other end penetrates through the middle sleeve 4; the inner rod body 2 is provided with ribs 11; the rib 11 is located in the middle sleeve 4; one end of an inner rod body 2 is fixed at the bottom end of a hole of a drill hole 3 through an anchoring agent 1, and axial anchoring force is continuously provided before and after surrounding rocks are damaged and when a tray and the surface of the surrounding rocks are separated due to plate cracking, rib spalling and rock burst in a part of roadway;
the hydraulic expansion shell 5 is formed by radially bending a steel pipe, and the purpose is to reduce the diameter of the hydraulic expansion shell 5; the hydraulic expansion shell 5 is sleeved on the periphery of the middle sleeve 4, and two ends of the hydraulic expansion shell are welded on the middle sleeve 4; two ends of a steel pipe of the hydraulic expansion shell 5 are welded with the middle sleeve 4, so that the air tightness is ensured; due to the radial expansion of the hydraulically expandable shell 5, the application of a radial prestress of the rod body to the borehole is provided;
the water injection hole 9 is arranged on the middle sleeve 4 and communicated with the hydraulic expansion shell 5; the inner part of the middle sleeve 4 is provided with a water injection hole 9, and external incoming water 12 enters the hydraulic expansion shell 5 through the water injection hole 9;
injecting water into the cavity of the hydraulic expansion shell 5 through the water injection hole 9 to expand the hydraulic expansion shell 5, wherein under the pressure of water 12 in the cavity of the hydraulic expansion shell 5, the outer shell of the hydraulic expansion shell 5 is tightly attached to the wall of the drilled hole, and the inner shell of the hydraulic expansion shell is tightly attached to the inner rod body 2, so that the other end of the inner rod body 2 is fixed at the hole opening end of the drilled hole 3, and meanwhile, radial anchoring force is continuously provided before and after the surrounding rock is damaged and when the tray and the surface of the surrounding rock are separated due to plate cracking, rib spalling and rock burst in a part of roadways;
a through hole structure 4.1 is arranged in the middle sleeve 4; the via structure 4.1 comprises a first via structure 4.11, a second via structure 4.12 and a third via structure 4.13; the first through hole structure 4.11, the second through hole structure 4.12 and the third through hole structure 4.13 are communicated in sequence; the inner diameter of the third through hole structure 4.13 is larger than the inner diameter of the first through hole structure 4.11; the second through hole structure 4.12 is an expanding structure; the inner diameter of one end of the second through hole structure 4.12 is equal to that of the first through hole structure 4.11, and the inner diameter of the other end of the second through hole structure is equal to that of the third through hole structure 4.13;
the inner rod body 2 is positioned in the first through hole structure 4.11; the ribs 11 are located within the second 4.12 and third 4.13 through-hole structures; the inner diameter of the first through hole structure 4.11 is larger than or equal to the outer diameter of the inner rod body 2 and smaller than the outer diameter of the rib 11;
the outer diameter of the ribs 11 is smaller than the inner diameter of the second through-hole arrangement 4.12 and smaller than the inner diameter of the third through-hole arrangement 4.13.
Further, the hydraulically expandable casing 5 is installed in the borehole 3 after being compressed. Water 12 is injected through a water injection port 9, so that the hydraulic expansion shell 5 is expanded and greatly deformed, and radial anchoring force is continuously applied before and after the tray and the surface of the surrounding rock are separated.
Furthermore, the hydraulic expansion shell 5 is compressed into a special shape (such as a flower shape, a wave shape and the like), then is installed in the drill hole 3, and is sleeved on the periphery of the middle sleeve 4, a round steel pipe is arranged before the hydraulic expansion shell 5 is expanded, and the purpose of compressing into the special shape (such as the flower shape, the wave shape and the like) is to reduce the diameter and conveniently put into the drill hole.
Further, a damping shim 7 is arranged between the pallet 10 and the rock mass 6 and covers the borehole 3;
the outer diameter of the damping gasket 7 is larger than that of the drill hole 3; the application of axial prestress of the rod body is completed through the damping gasket 7, the tray 10 and the nut 8, and meanwhile, the axial prestress and radial prestress application of the anchor rod body is realized.
Further, a grout hole 13 is provided inside the inner rod body 2.
Further, the grouting holes 13 comprise a main grouting hole 13.1 and a branch grouting hole 13.2;
the grouting main hole 13.1 is a through hole structure; the main grouting hole 13.1 is arranged in the inner rod body 2, and grouting reinforcement is carried out on surrounding rocks when needed, so that grouting through the grouting hole has an inhibiting effect on cracking, rib spalling and rock burst of a surrounding rock plate;
two ends of the grouting main hole 13.1 are respectively flush with two ends of the inner rod body 2;
one end of the grouting branch hole 13.2 is communicated with the grouting main hole 13.1, the other end of the grouting branch hole is arranged on the outer wall of the inner rod body 2, grouting slurry sequentially flows into the drill hole 2 through the grouting main hole 13.1 and the grouting branch hole 13.2 to reinforce surrounding rocks and inhibit cracking, rib spalling and rock burst of a surrounding rock slab;
further, a main grouting hole 13.1 penetrates through the inner rod body 2; the length of the grouting main hole 13.1 is equal to that of the inner rod body 2;
grouting branch hole 13.2 has a plurality ofly, and a plurality of grouting branch holes 13.2 are staggered arrangement, improve slip casting efficiency, and cover whole drilling, improve the slip casting effect. Grouting liquid sequentially flows into a gap between the inner rod body 2 and the drilled hole and a surrounding rock crack through the grouting main hole 13.1 and the grouting branch hole 13.2, and the inner rod body 2 and the drilled hole are bonded.
The anchoring agent in the invention is epoxy resin glue used for bonding the bonding rod body and the surrounding rock into a whole.
The invention relates to a using method of a rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod, which comprises the following steps of,
the method comprises the following steps: installing a rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod;
the inner rod body 2 is anchored in a rock body 6 through the anchoring agent 1, and the middle sleeve 4 is fixed on the rock body 6 through the damping gasket 7, the tray 10 and the nut 8, so that the axial anchoring force of the rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod is applied;
water is injected 12 through a water injection port 9, so that the hydraulic expansion shell 5 is expanded and deformed, the outer diameter of the hydraulic expansion shell is enlarged, the hydraulic expansion shell is tightly attached to the hole wall of the drill hole 3 (the water injection hole is arranged on the hole wall of the middle sleeve 4, water 12 is injected into the water injection hole through a high-pressure water injection pump, the water 12 can enter the hydraulic expansion shell 5, the expansion of the hydraulic expansion shell 5 is realized), and the application of the radial anchoring force of the rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod is realized; so far, the installation of the anchor rod is completed;
step two: anchor bolt support;
when the surrounding rock deforms, the function of large deformation of the anchor rod structure is realized by relative sliding of the middle sleeve 4 and the inner rod body 2 and cutting of the ribs 11 on the inner rod body,
when the tray is empty from the surface of the surrounding rock, the inner rod body 2 is fixed in the drilled hole through the anchoring agent 1 to provide axial anchoring force, and the axial anchoring force is provided through the friction force generated by the relative movement and deformation of the inner rod body 2 and the middle sleeve 4; radial anchoring force is provided by the expansion deformation of the hydraulic expansion shell 5 and the tight contact between the hydraulic expansion shell 5 and the hole wall of the borehole 3; at the moment, the whole sleeve expansion type large-deformation prestress hydraulic expansion anchor rod still has prestress, continuous supporting force is provided for the surrounding rock, and the surrounding rock is continuously supported through the sleeve expansion type large-deformation prestress hydraulic expansion anchor rod.
As shown in fig. 4, fig. 4 is a state before cutting, a plurality of ribs 11 are arranged before cutting, the whole body of the rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod extends along with the deformation of surrounding rocks, the ribs 11 on the inner rod body are cut off one by one in the whole extending process of the anchor rod, the ribs of the rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod are reduced after cutting, other structures are unchanged, and the ribs 11 on the inner rod body are cut off (namely the deformation of the invention), so that the invention adapts to the deformation of the surrounding rocks and continuously provides anchoring force. The large deformation of the structure of the invention is to adapt to the deformation of surrounding rocks and continuously provide anchoring force; the anchor rod overcomes the defects that the anchor rod in the prior art can not adapt to the deformation of the surrounding rock, and the anchor rod is broken along with the deformation of the surrounding rock and can not play a role in supporting.
When the cracking, the caving or the rock burst of the surrounding rock can not be prevented, the tray and the surface of the surrounding rock are hollowed, and the hydraulic expansion shell 5 is tightly contacted with the hole wall and the radial anchoring force of the rod body exists, and the axial anchoring force exists (one end of the inner rod body 2 is fixed at the bottom end of the hole of the drilling hole 3 through the anchoring agent layer 1, and the axial anchoring force is continuously provided before and after the surrounding rock is damaged and when the tray and the surface of the surrounding rock are hollowed due to the cracking, the caving and the rock burst of a part of roadway).
Further, in the second step, grouting is carried out as required to reinforce the surrounding rock, grouting slurry flows into a gap between the inner rod body 2 and the drill hole through the grouting main hole 13.1 and the grouting branch hole 13.2 in sequence, the wall of the inner rod body 2 and the wall of the drill hole 3 are bonded, cracks generated in the large deformation process of the surrounding rock are blocked, the surrounding rock is reinforced, and the integrity and the bearing capacity of the surrounding rock are improved; when the tray is separated from the surface of the surrounding rock, the anchor rod still has a certain supporting effect due to the fact that the hydraulic expansion shell 5 is in close contact with the hole wall of the drill hole 3 and the radial anchoring force of the rod body exists, and the surrounding rock is continuously supported through the anchor rod.
In order to more clearly illustrate the advantages of the rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod of the invention compared with the prior art, workers compare the two technical schemes, and the comparison results are as follows:
from the above table, compared with the prior art, the rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod provides pretightening force through friction between the hydraulic expansion shell and the wall of a drill hole, can still provide three-way stress for surrounding rocks after the surrounding rocks and the tray are separated, can be used for grouting to reinforce the surrounding rocks, is high in applicability, is suitable for supporting the surrounding rocks of general rock bodies, and can still provide supporting effect when the surrounding rocks and the tray are separated.
Other parts not described belong to the prior art.
Claims (7)
1. The utility model provides a body of rod cutting formula large deformation prestressing force water conservancy inflation slip casting stock which characterized in that: comprises an anchoring agent (1), an inner rod body (2), a middle sleeve (4), a hydraulic expansion shell (5) and a tray (10);
the anchoring agent (1) and the hydraulic expansion shell (5) are both positioned in the drill hole (3);
one end of the middle sleeve (4) is positioned in the drill hole (3), and the other end of the middle sleeve extends out of the drill hole (3) and is fixed on a rock body (6) through a nut (8) and a tray (10);
the inner rod body (2) is a grouting anchor rod;
one end of the inner rod body (2) is fixed at the bottom of the drilled hole (3) through the anchoring agent (1), and the other end penetrates through the middle sleeve (4); ribs (11) are arranged on the inner rod body (2); the rib (11) is positioned in the middle sleeve (4);
the hydraulic expansion shell (5) is formed by radially bending a steel pipe; the hydraulic expansion shell (5) is positioned in the drill hole (3); the hydraulic expansion shell (5) is sleeved on the periphery of the middle sleeve (4), and two ends of the hydraulic expansion shell are welded on the middle sleeve (4);
the water injection hole (9) is arranged on the middle sleeve (4) and is communicated with the hydraulic expansion shell (5);
a through hole structure (4.1) is arranged in the middle sleeve (4); the through hole structure (4.1) comprises a first through hole structure (4.11), a second through hole structure (4.12) and a third through hole structure (4.13); the first through hole structure (4.11), the second through hole structure (4.12) and the third through hole structure (4.13) are communicated in sequence; the inner diameter of the third through hole structure (4.13) is larger than that of the first through hole structure (4.11); the second through hole structure (4.12) is an expanding structure; the inner diameter of one end of the second through hole structure (4.12) is equal to that of the first through hole structure (4.11), and the inner diameter of the other end of the second through hole structure is equal to that of the third through hole structure (4.13);
the inner rod body (2) is positioned in the first through hole structure (4.11); the ribs (11) are positioned in the second through hole structure (4.12) and the third through hole structure (4.13); the inner diameter of the first through hole structure (4.11) is larger than or equal to the outer diameter of the inner rod body (2) and smaller than the outer diameter of the rib (11);
the outer diameter of the rib (11) is smaller than the inner diameter of the second through hole structure (4.12).
2. The rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod as claimed in claim 1, wherein: the hydraulic expansion shell (5) is installed in the drill hole (3) after being compressed.
3. The cutting type large-deformation prestressed hydraulic expansion grouting anchor rod as claimed in claim 2, wherein: the hydraulic expansion shell (5) is compressed into a flower shape or a wave shape, is arranged in the drill hole (3) and is sleeved on the periphery of the middle sleeve (4).
4. The rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod as claimed in claim 3, wherein: the damping gasket (7) is arranged between the tray (10) and the rock body (6) and covers the drill hole (3);
the outer diameter of the damping shim (7) is larger than that of the drill hole (3).
5. The cutting type large-deformation prestressed hydraulic expansion grouting anchor rod as claimed in claim 4, wherein: the grouting holes (13) are arranged inside the inner rod body (2).
6. The cutting type large-deformation prestressed hydraulic expansion grouting anchor rod as claimed in claim 5, wherein: the grouting holes (13) comprise grouting main holes (13.1) and grouting branch holes (13.2);
the grouting main hole (13.1) is of a through hole structure;
the grouting main hole (13.1) is arranged inside the inner rod body (2);
one end of the grouting branch hole (13.2) is communicated with the grouting main hole (13.1), and the other end is arranged on the outer wall of the inner rod body (2).
7. The cutting type large-deformation prestressed hydraulic expansion grouting anchor rod as claimed in claim 6, wherein: the main grouting hole (13.1) penetrates through the inner rod body (2); the length of the grouting main hole (13.1) is equal to that of the inner rod body (2);
the plurality of grouting branch holes (13.2) are arranged in a staggered manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210522439.5A CN115045695A (en) | 2022-05-13 | 2022-05-13 | Rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210522439.5A CN115045695A (en) | 2022-05-13 | 2022-05-13 | Rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115045695A true CN115045695A (en) | 2022-09-13 |
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ID=83157857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210522439.5A Pending CN115045695A (en) | 2022-05-13 | 2022-05-13 | Rod body cutting type large-deformation prestress hydraulic expansion grouting anchor rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115045695A (en) |
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2022
- 2022-05-13 CN CN202210522439.5A patent/CN115045695A/en active Pending
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