CN115614078B - Anchor rod device and support method suitable for fault anchoring - Google Patents
Anchor rod device and support method suitable for fault anchoring Download PDFInfo
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- CN115614078B CN115614078B CN202211045246.1A CN202211045246A CN115614078B CN 115614078 B CN115614078 B CN 115614078B CN 202211045246 A CN202211045246 A CN 202211045246A CN 115614078 B CN115614078 B CN 115614078B
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- anchor rod
- steel strand
- connecting disc
- fault
- cavity
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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
- E21D21/0033—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts having a jacket or outer tube
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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
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/003—Machines for drilling anchor holes and setting anchor bolts
-
- 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
-
- 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
- E21D21/0046—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts formed by a plurality of elements arranged longitudinally
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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
- E21D21/006—Anchoring-bolts made of cables or wires
-
- 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
- E21D21/0093—Accessories
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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)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention provides an anchor rod device suitable for fault anchoring and a supporting method, and relates to the technical field of rock-soil anchoring. This anchor rod device suitable for fault anchoring makes the outer sleeve correspond the position of anchor rod drilling middle fault, when fault dislocation takes place, down the stock takes place the dislocation for last stock and removes, and the outer sleeve takes place to bend at stranded conductor cavity position, simultaneously, second steel strand wires connection pad is kept away from first steel strand wires connection pad, and some or whole steel strand wires become the tensioning state by the relaxation state, atress is in order to strengthen the joint strength of last stock and lower anchor rod after the steel strand wires tensioning, and second steel strand wires connection pad is along letting the axial displacement of a section of thick bamboo, lets the preforming by the extrusion deformation realize letting the pressure buffering, with steel strand wires continuous tensioning, let the preforming continuously by the extrusion deformation, finally make the steel strand wires, let the preforming reach static equilibrium state. Therefore, the anchor rod device can bear partial shear stress and instantaneous larger axial stress generated by fault dislocation at the fault position.
Description
Technical Field
The invention relates to the technical field of rock and soil anchoring, in particular to an anchor rod device suitable for fault anchoring and a supporting method.
Background
With the continuous development of economy and technology in China, in recent years, china starts to start some important infrastructure projects which are not constructed before for various reasons. In the continuous advancing process of major basic engineering construction, projects with large burial depth, multiple faults and complex geological conditions are continuously encountered. Among them, faults are one of the more common problems we encounter, and support at faults is more important. The reinforcement inside the surrounding rock is often used in engineering as anchor bolt support, and the support quality of the anchor bolt directly relates to the safety of the engineering. The anchor bolt support mainly bears axial stress, but after the support, if fault dislocation develops along the radial direction of the anchor bolt, the anchor bolt is sheared due to low shear strength of the anchor bolt, the support is damaged, and the safety of the whole structure can be seriously endangered. In addition, in fault dislocation, instantaneous large axial stress can be generated on the anchor rod, and the anchor rod is also in risk of being broken. The partial engineering at the present stage is to timely grouting and anchor the rock and soil body and embed a device at the secondary lining position to offset shearing deformation after fault dislocation is generated so as to offset the influence caused by the fault dislocation. The grouting anchoring and the embedding of the device at the secondary lining position counteract shearing deformation to perform construction operation, so that the engineering construction workload is increased, time and labor are wasted, and the recovery effect is not ideal.
Disclosure of Invention
The invention aims to provide an anchor rod device suitable for fault anchoring and a supporting method suitable for fault anchoring, so that the anchor rod device bears partial shear stress and instantaneous larger axial stress generated by fault dislocation at a fault position.
In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:
The anchor rod device suitable for fault anchoring comprises an outer sleeve, a first steel strand connecting disc, a second steel strand connecting disc, a yielding cylinder, an upper anchor rod, a lower anchor rod and steel strands;
The inner part of the outer sleeve is sequentially provided with an anchor rod cavity, a first connecting disc assembly cavity, a stranded wire cavity, a second connecting disc assembly cavity and a pressure yielding cavity which are sequentially communicated from top to bottom, the upper end of the anchor rod cavity is exposed from the upper end face of the outer sleeve, the lower end of the pressure yielding cavity is exposed from the lower end face of the outer sleeve, the circumferential inner wall of the first connecting disc assembly cavity is provided with a first threaded hole, a limiting step is arranged between the second connecting disc assembly cavity and the stranded wire cavity, and the circumferential inner wall of the pressure yielding cavity is provided with a second threaded hole;
the circumference outer wall of the first steel strand connecting disc is provided with a first external thread matched with the first threaded hole, and a third threaded hole is formed in the middle of the first steel strand connecting disc;
A fourth threaded hole is formed in the middle of the second steel strand connecting disc;
The circumference outer wall of the yielding cylinder is provided with a second external thread matched with the second threaded hole, the inner wall of the yielding cylinder is provided with a plurality of annular yielding pieces, and the middle position of the yielding pieces is provided with a through hole;
The lower end circumference outer wall of the upper anchor rod is provided with a third external thread matched with the third threaded hole;
The upper end circumference outer wall of the lower anchor rod is provided with a fourth external thread matched with the fourth threaded hole;
The first steel strand connecting disc is in threaded connection with the first connecting disc assembly cavity, the upper anchor rod penetrates through the anchor rod cavity, and the lower end of the upper anchor rod is in threaded connection with the third threaded hole;
The second steel strand connecting disc is arranged in the second connecting disc assembly cavity, the upper end edge of the second steel strand connecting disc is lapped on the limiting step, the lower anchor rod penetrates through the pressure yielding cavity, and the upper end of the lower anchor rod is in threaded connection with the fourth threaded hole;
a plurality of steel strands are connected between the first steel strand connecting disc and the second steel strand connecting disc, and when the edge of the second steel strand connecting disc is lapped on the limiting step, the steel strands are in a loose state;
The pressure cylinder is in threaded connection with the pressure cavity, the lower anchor rod passes through the through hole in the middle of the pressure plate, and the pressure plate at the uppermost end is lapped with the lower end edge of the second steel strand connecting disc.
Preferably, the outer sleeve comprises a left half sleeve and a right half sleeve with semi-cylindrical outer contours, the left half sleeve and the right half sleeve are assembled and connected into a whole, and one of the left half sleeve and the right half sleeve is provided with internal threads on the inner wall of the first connecting disc assembling cavity.
Preferably, the left half sleeve and the right half sleeve are assembled and connected into a whole through a clamp.
Preferably, the fitting parts of the left half sleeve and the right half sleeve and the clamp are provided with fitting grooves, and the clamp is positioned in the fitting grooves.
Preferably, the first steel strand connecting disc is provided with a first wire hole along the axial direction, the upper end surface of the first steel strand connecting disc is provided with a first sinking groove at the edge of the first wire hole, the upper end of the steel strand penetrates through the first wire hole, the upper end of the steel strand is provided with a first limiting block, the first limiting block is positioned in the first sinking groove, the second steel strand connecting disc is provided with a second wire hole along the axial direction, the lower end surface of the second steel strand connecting disc is provided with a second sinking groove at the edge of the second wire hole, the lower end of the steel strand penetrates through the second wire hole, the lower end of the steel strand is provided with a second limiting block, and the second limiting block is positioned in the second sinking groove.
Preferably, the plurality of yielding press pieces are arranged along the axial direction of the yielding press cylinder at set intervals.
Preferably, the thicknesses of the plurality of pressing pieces are sequentially increased from top to bottom along the axial direction of the pressing barrel.
The supporting method suitable for fault anchoring is applied to the anchor rod device suitable for fault anchoring;
the method comprises the following steps:
Step 1, drilling holes in surrounding rock to form anchor rod drilling holes, determining the position of a fault in the anchor rod drilling holes, and setting the lengths of an upper anchor rod and a lower anchor rod according to the depth of the anchor rod drilling holes and the position of the fault in the anchor rod drilling holes;
Connecting the upper end of a steel strand with a first steel strand connecting disc, connecting the first steel strand connecting disc with a first connecting disc assembly cavity, penetrating an upper anchor rod through the anchor rod cavity, and connecting the lower end of the upper anchor rod with a third threaded hole of the first steel strand connecting disc;
Connecting the lower end of the steel strand with a second steel strand connecting disc, placing the second steel strand connecting disc in a second connecting disc assembly cavity, overlapping the edge of the upper end of the second steel strand connecting disc on a limiting step to enable the steel strand to be in a loose state, enabling a lower anchor rod to pass through a yielding cavity, and connecting the upper end of the lower anchor rod in a fourth threaded hole of the second steel strand connecting disc;
Finally, the yielding cylinder is in threaded connection with the yielding cavity, the lower anchor rod penetrates through a through hole in the middle of the yielding sheet, and the yielding sheet at the uppermost end is lapped with the lower end edge of the second steel strand connecting disc;
Step2, an anchoring agent is placed in an anchor rod drilling hole, an anchor rod device suitable for fault anchoring is placed in the anchor rod drilling hole, a lower anchor rod is positioned in the anchor rod drilling hole, an upper anchor rod is positioned outside the anchor rod drilling hole, an outer sleeve corresponds to the position of a fault in the anchor rod drilling hole, the anchor rod device suitable for fault anchoring is connected with surrounding rock through anchoring agent anchoring, and the outer end of the upper anchor rod is fixed on the outer wall of the surrounding rock through an anchoring assembly;
And 3, dislocation movement of the anchor rod relative to the upper anchor rod occurs when fault dislocation occurs, the outer sleeve is bent, meanwhile, the second steel strand connecting disc is far away from the first steel strand connecting disc, part or all of steel strands are changed into a tensioning state from a loosening state, the second steel strand connecting disc moves along the axial direction of the yielding cylinder, the pressing sheet is extruded and deformed, and finally the steel strands and the pressing sheet reach a static equilibrium state.
The beneficial technical effects of the invention are as follows:
The invention discloses an anchor rod device and a supporting method suitable for fault anchoring, which enable an outer sleeve to correspond to the position of a fault in anchor rod drilling, wherein in the normal supporting process, the whole device is connected into an integral structure, so that axial stress can be born, surrounding rock supporting is realized, when fault dislocation occurs, a lower anchor rod moves in a staggered manner relative to an upper anchor rod, the outer sleeve is of a hollow structure at the position of a stranded wire cavity so that the outer sleeve bends at the position of the stranded wire cavity, meanwhile, a second steel stranded wire connecting disc is far away from a first steel stranded wire connecting disc, part or all of steel stranded wires are changed from a loose state into a tensioning state, the steel stranded wires are stressed after being tensioned so as to strengthen the connection strength of the upper anchor rod and the lower anchor rod, the second steel stranded wire connecting disc moves along the axial direction of a compression cylinder, compression deformation is realized, the compression is carried out along with the continuous tensioning of the steel stranded wires, the compression deformation is realized, and finally the compression sheet is kept in a static balanced state. Therefore, the anchor rod device can bear partial shear stress and instantaneous larger axial stress generated by fault dislocation at the fault position, the anchor rod device is prevented from being broken, the integrity of the support of the anchor rod device is maintained, and the safe and stable support of surrounding rock is realized.
Drawings
FIG. 1 is a schematic structural view of an anchor rod device suitable for fault anchoring according to an embodiment of the present invention;
FIG. 2 is a supporting layout of an anchor rod device suitable for fault anchoring according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of an outer sleeve of an anchor device adapted for fault anchoring according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view A-A of FIG. 1;
FIG. 5 is a cross-sectional view B-B of FIG. 1;
FIG. 6 is a cross-sectional view of C-C of FIG. 1;
FIG. 7 is a sectional view D-D of FIG. 1;
FIG. 8 is a top view of a first steel strand land in an anchor device adapted for fault anchoring in accordance with an embodiment of the present invention;
FIG. 9 is a bottom view of a second steel strand land in an anchor device adapted for fault anchoring in accordance with an embodiment of the present invention;
fig. 10 is a schematic view showing the assembly of an outer sleeve in an anchor device for fault anchoring according to an embodiment of the present invention.
Detailed Description
The present invention will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantageous effects of the present invention more apparent. Some embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments are shown. Indeed, various embodiments of the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather as provided so that the present invention meets applicable legal requirements.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "inner", "outer", "upper", "lower", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In an embodiment of the present invention, an anchor rod device suitable for fault anchoring and a supporting method suitable for fault anchoring are provided, and please refer to fig. 1 to 10.
An anchor rod device suitable for fault anchoring comprises an outer sleeve 1, a first steel strand connecting disc 21, a second steel strand connecting disc 22, a yielding cylinder 3, an upper anchor rod 41, a lower anchor rod 42 and steel strands 5.
The inside from top to bottom of outer sleeve 1 sets gradually stock cavity 11, first connection pad assembly cavity 12, stranded conductor cavity 13, second connection pad assembly cavity 14 and lets pressure cavity 15, and stock cavity 11, first connection pad assembly cavity 12, stranded conductor cavity 13, second connection pad assembly cavity 14 and let pressure cavity 15 communicate in order. The upper end of the anchor rod cavity 11 is exposed from the upper end face of the outer sleeve 1, the lower end of the pressing cavity 15 is exposed from the lower end face of the outer sleeve 1, the circumferential inner wall of the first connecting disc assembling cavity 12 is provided with a first threaded hole 121, a limiting step 16 is arranged between the second connecting disc assembling cavity 14 and the stranded wire cavity 13, and the circumferential inner wall of the pressing cavity 15 is provided with a second threaded hole 151.
The circumferential outer wall of the first steel strand connecting disc 21 is provided with a first external thread, the first external thread is matched with the first threaded hole 121, and a third threaded hole 211 is formed in the middle of the first steel strand connecting disc 21.
A fourth threaded hole 221 is formed in the middle of the second steel strand connecting disc 22.
Let the circumference outer wall of pressure section of thick bamboo 3 set up to the second external screw thread, and the second external screw thread matches with second screw hole 151, lets the inner wall of pressure section of thick bamboo 3 be provided with four annular let preforming 6, lets the intermediate position of preforming 6 set up to the through-hole.
The four yielding press plates 6 are arranged along the axial interval set distance of the yielding press cylinder 3, so that when the second steel strand connecting disc 22 moves along the axial direction of the yielding press cylinder 3, the second steel strand connecting disc 22 is sequentially acted on by the four yielding press plates 6, and the yielding press buffering is sequentially realized by the four yielding press plates 6. Adjacent yielding press sheets 6 are arranged at a set distance to leave a downward deformation space for the yielding press sheets 6 above, and the yielding press sheets 6 realize yielding buffer by being extruded and deformed. The thickness of the four yielding press plates 6 is sequentially increased from top to bottom along the axial direction of the yielding press cylinder 3, the deformation amount of the four yielding press plates 6 which are extruded and deformed from top to bottom is gradually reduced, progressive yielding buffering is realized by the four yielding press plates 6 from top to bottom, and after the yielding press plates 6 above are extruded and deformed, the yielding press cylinder 3 is firmly connected with the second steel strand connecting disc 22 through the yielding press plates 6 below, so that the anchor rod device is kept to bear larger axial stress.
The lower end circumferential outer wall of the upper anchor 41 is provided with a third external thread, which is matched with the third threaded hole 211.
The upper circumferential outer wall of the lower anchor rod 42 is provided with a fourth external thread, which is matched with the fourth thread, 221.
The first steel strand connecting disc 21 is in threaded connection with the first connecting disc assembly cavity 12, the upper anchor 41 penetrates through the anchor cavity 11, and the lower end of the upper anchor 41 is in threaded connection with the third threaded hole 211.
The second steel strand connecting disc 22 is placed in the second connecting disc assembly cavity 14, the upper end edge of the second steel strand connecting disc 22 is lapped on the limiting step 16, the lower anchor rod 42 passes through the pressure-yielding cavity 15, and the upper end of the lower anchor rod 42 is connected in the fourth threaded hole 221 in a threaded mode.
A plurality of steel strands 5 are connected between the first steel strand connecting disc 21 and the second steel strand connecting disc 22, and when the edge of the second steel strand connecting disc 22 is lapped on the limiting step 16, the steel strands 5 are in a loose state.
The yielding cylinder 3 is in threaded connection in the yielding cavity 15, the lower anchor rod 42 penetrates through the through hole in the middle of the yielding sheet 6, and the yielding sheet 6 at the uppermost end is lapped with the lower end edge of the second steel strand connecting disc 22. The second strand attachment disc 22 is restrained within the second attachment disc assembly cavity 14 by the uppermost yielding tab 6 together with the restraining step 16.
In order to facilitate the assembly of the first steel strand connecting disc 21 and the steel strands 5, the outer sleeve 1 comprises a half sleeve 11 and a right half sleeve 102, and the outer profiles of the half sleeve 11 and the right half sleeve 102 are semi-cylindrical. The left half sleeve 101 and the right half sleeve 102 are assembled and connected into a whole, and the left half sleeve 101 is provided with internal threads on the inner wall of the first connecting disc assembling cavity 12. In this way, the upper end of the steel strand 5 is connected with the first steel strand connecting disc 21, then the first steel strand connecting disc 21 is connected with the inner wall of the first connecting disc assembling cavity 12 by screw threads, and finally the right half sleeve 102 is buckled on the half sleeve 11 to assemble and connect the two. Wherein, the left half sleeve 101 and the right half sleeve 102 are assembled and connected into a whole through a clamp 103. The fitting position of the left half sleeve 101 and the right half sleeve 102 and the clamp 103 is provided with an assembly groove 104, and the clamp 103 is positioned in the assembly groove 104, so that the clamp 103 is firmly assembled with the outer sleeve 1, and the clamp 103 is prevented from falling off from the outer sleeve 1.
The first wire hole 212 is formed in the first steel strand connecting disc 21 along the axial direction, the first sinking groove 213 is formed in the upper end face of the first steel strand connecting disc 21 at the edge of the first wire hole 212, the upper end of the steel strand 5 penetrates through the first wire hole 212, the first limiting block 51 is assembled at the upper end of the steel strand 5, and the first limiting block 51 is located in the first sinking groove 213. The second steel strand connecting disc 22 is provided with a second wire hole 222 along the axial direction, the lower end surface of the second steel strand connecting disc 22 is provided with a second sinking groove 223 at the edge of the second wire hole 222, the lower end of the steel strand 5 passes through the second wire hole 222, the lower end of the steel strand 5 is provided with a second limiting block 52, and the second limiting block 52 is positioned in the second sinking groove 223. So, with the realization steel strand wires 5 with first steel strand wires connection pad 21, second steel strand wires connection pad 22 be connected, convenient connection and firm in connection.
In the embodiment of the invention, a supporting method suitable for fault anchoring is also provided, and the anchor rod device suitable for fault anchoring is applied;
the method comprises the following steps:
Step 1, drilling holes in surrounding rock to form anchor rod drilling holes 7, determining the position of a fault in the anchor rod drilling holes 7, and setting the lengths of an upper anchor rod 41 and a lower anchor rod 42 according to the depth of the anchor rod drilling holes 7 and the position of the fault in the anchor rod drilling holes 7;
The upper end of the steel strand 5 is connected with a first steel strand connecting disc 21, the first steel strand connecting disc 21 is connected in a first connecting disc assembling cavity 12, an upper anchor rod 41 passes through an anchor rod cavity 11, and the lower end of the upper anchor rod 41 is connected in a third threaded hole 211 of the first steel strand connecting disc 21;
connecting the lower end of the steel strand 5 with a second steel strand connecting disc 22, placing the second steel strand connecting disc 22 in a second connecting disc assembling cavity 14, overlapping the edge of the upper end of the second steel strand connecting disc 22 on a limiting step 16 to enable the steel strand 5 to be in a loose state, enabling a lower anchor rod 42 to pass through a yielding cavity 15, and connecting the upper end of the lower anchor rod 42 in a fourth threaded hole 221 of the second steel strand connecting disc 22;
finally, the yielding cylinder 3 is connected in the yielding cavity 15 in a threaded manner, the lower anchor rod 42 penetrates through the through hole in the middle of the yielding sheet 6, and the yielding sheet 6 at the uppermost end is lapped with the lower end edge of the second steel strand connecting disc 22.
Step 2, an anchoring agent is placed in the anchor rod drilling hole 7, an anchor rod device suitable for fault anchoring is placed in the anchor rod drilling hole 7, the lower anchor rod 42 is located in the anchor rod drilling hole 7, the upper anchor rod 41 is located outside the anchor rod drilling hole 7, the outer sleeve 1 corresponds to the position of a fault in the anchor rod drilling hole 7, the anchor rod device suitable for fault anchoring is connected with surrounding rock through anchoring agent anchoring, and the outer end of the upper anchor rod 41 is fixed on the outer wall of the surrounding rock through an anchoring assembly (an anchor rod disc 81 and a locking nut 82). Furthermore, when a roof bolt device suitable for fault anchoring needs to be arranged at a set angle inclined with respect to the surrounding rock outer wall, a triangular bracket 83 may be arranged between the anchoring assembly and the surrounding rock outer wall.
And 3, when fault dislocation occurs, the anchor rod 42 moves in a dislocation manner relative to the upper anchor rod 41, the outer sleeve 1 is bent, meanwhile, the second steel strand connecting disc 22 is far away from the first steel strand connecting disc 21, part or all of the steel strands 5 are changed from a loose state to a tensioning state, the second steel strand connecting disc 22 moves along the axial direction of the yielding cylinder 3, the pressing sheet 6 is extruded and deformed, and finally the steel strands 5 and the pressing sheet 6 reach a static equilibrium state.
The present embodiment has been described in detail with reference to the accompanying drawings. From the above description, the person skilled in the art will be aware of the anchor rod device according to the invention for fault anchoring. According to the anchor rod device and the support method suitable for fault anchoring, the outer sleeve 1 corresponds to the position of a fault in the anchor rod drilling 7, the whole device is connected into an integral structure in the normal support process, axial stress can be borne, surrounding rock support is achieved, when fault dislocation occurs, the lower anchor rod 42 moves in a staggered mode relative to the upper anchor rod 41, the outer sleeve 1 is of a hollow structure at the position of the stranded wire cavity 13 so that the outer sleeve 1 bends at the position of the stranded wire cavity 13, meanwhile, the second steel stranded wire connecting disc 22 is far away from the first steel stranded wire connecting disc 21, part or all of the steel stranded wires 5 are changed into a tensioning state, the steel stranded wires 5 are stressed after being tensioned so as to strengthen the connection strength of the upper anchor rod 41 and the lower anchor rod 42, the second steel stranded wire connecting disc 22 moves along the axial direction of the compression cylinder 3, the compression sheet 6 is deformed in an extrusion mode so as to achieve compression buffering, the steel stranded wires 5 are continuously tensioned, the compression sheet 6 is deformed continuously, and finally the steel stranded wires 5 and the compression sheet 6 reach a static equilibrium state. Therefore, the anchor rod device can bear partial shear stress and instantaneous larger axial stress generated by fault dislocation at the fault position, the anchor rod device is prevented from being broken, the integrity of the support of the anchor rod device is maintained, and the safe and stable support of surrounding rock is realized.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.
Claims (6)
1. The anchor rod device suitable for fault anchoring is characterized by comprising an outer sleeve, a first steel strand connecting disc, a second steel strand connecting disc, a yielding cylinder, an upper anchor rod, a lower anchor rod and steel strands;
The inner part of the outer sleeve is sequentially provided with an anchor rod cavity, a first connecting disc assembly cavity, a stranded wire cavity, a second connecting disc assembly cavity and a pressure yielding cavity which are sequentially communicated from top to bottom, the upper end of the anchor rod cavity is exposed from the upper end face of the outer sleeve, the lower end of the pressure yielding cavity is exposed from the lower end face of the outer sleeve, the circumferential inner wall of the first connecting disc assembly cavity is provided with a first threaded hole, a limiting step is arranged between the second connecting disc assembly cavity and the stranded wire cavity, and the circumferential inner wall of the pressure yielding cavity is provided with a second threaded hole;
the circumference outer wall of the first steel strand connecting disc is provided with a first external thread matched with the first threaded hole, and a third threaded hole is formed in the middle of the first steel strand connecting disc;
A fourth threaded hole is formed in the middle of the second steel strand connecting disc;
The circumference outer wall of the yielding cylinder is provided with a second external thread matched with the second threaded hole, the inner wall of the yielding cylinder is provided with a plurality of annular yielding pieces, and the middle position of the yielding pieces is provided with a through hole;
the plurality of pressing pieces are arranged at set intervals along the axial direction of the pressing barrel, the thickness of the plurality of pressing pieces is sequentially increased from top to bottom along the axial direction of the pressing barrel;
The lower end circumference outer wall of the upper anchor rod is provided with a third external thread matched with the third threaded hole;
The upper end circumference outer wall of the lower anchor rod is provided with a fourth external thread matched with the fourth threaded hole;
The first steel strand connecting disc is in threaded connection with the first connecting disc assembly cavity, the upper anchor rod penetrates through the anchor rod cavity, and the lower end of the upper anchor rod is in threaded connection with the third threaded hole;
The second steel strand connecting disc is arranged in the second connecting disc assembly cavity, the upper end edge of the second steel strand connecting disc is lapped on the limiting step, the lower anchor rod penetrates through the pressure yielding cavity, and the upper end of the lower anchor rod is in threaded connection with the fourth threaded hole;
a plurality of steel strands are connected between the first steel strand connecting disc and the second steel strand connecting disc, and when the edge of the second steel strand connecting disc is lapped on the limiting step, the steel strands are in a loose state;
The pressure cylinder is in threaded connection with the pressure cavity, the lower anchor rod passes through the through hole in the middle of the pressure plate, and the pressure plate at the uppermost end is lapped with the lower end edge of the second steel strand connecting disc.
2. The anchor rod device for fault anchoring according to claim 1, wherein the outer sleeve comprises a left half sleeve and a right half sleeve which are semi-cylindrical in outer contour, the left half sleeve and the right half sleeve are assembled and connected into a whole, and one of the left half sleeve and the right half sleeve is provided with internal threads on the inner wall of the first connecting disc assembling cavity.
3. The roof bolt device for fault anchoring according to claim 2, wherein the left half sleeve and the right half sleeve are connected integrally through a clamp assembly.
4. The roof bolt device for fault anchoring according to claim 1, wherein the fitting parts of the left half sleeve and the right half sleeve and the clamp are provided with fitting grooves, and the clamp is positioned in the fitting grooves.
5. The anchor rod device suitable for fault anchoring is characterized in that a first wire hole is formed in the first steel strand connecting disc along the axial direction, a first sinking groove is formed in the upper end face of the first steel strand connecting disc at the edge of the first wire hole, the upper end of the steel strand penetrates through the first wire hole, a first limiting block is assembled at the upper end of the steel strand and is located in the first sinking groove, a second wire hole is formed in the second steel strand connecting disc along the axial direction, a second sinking groove is formed in the lower end face of the second steel strand connecting disc at the edge of the second wire hole, the lower end of the steel strand penetrates through the second wire hole, a second limiting block is assembled at the lower end of the steel strand and is located in the second sinking groove.
6. A supporting method suitable for fault anchoring, characterized in that the anchor rod device suitable for fault anchoring according to any one of claims 1 to 5 is applied;
the method comprises the following steps:
Step 1, drilling holes in surrounding rock to form anchor rod drilling holes, determining the position of a fault in the anchor rod drilling holes, and setting the lengths of an upper anchor rod and a lower anchor rod according to the depth of the anchor rod drilling holes and the position of the fault in the anchor rod drilling holes;
Connecting the upper end of a steel strand with a first steel strand connecting disc, connecting the first steel strand connecting disc with a first connecting disc assembly cavity, penetrating an upper anchor rod through the anchor rod cavity, and connecting the lower end of the upper anchor rod with a third threaded hole of the first steel strand connecting disc;
Connecting the lower end of the steel strand with a second steel strand connecting disc, placing the second steel strand connecting disc in a second connecting disc assembly cavity, overlapping the edge of the upper end of the second steel strand connecting disc on a limiting step to enable the steel strand to be in a loose state, enabling a lower anchor rod to pass through a yielding cavity, and connecting the upper end of the lower anchor rod in a fourth threaded hole of the second steel strand connecting disc;
Finally, the yielding cylinder is in threaded connection with the yielding cavity, the lower anchor rod penetrates through a through hole in the middle of the yielding sheet, and the yielding sheet at the uppermost end is lapped with the lower end edge of the second steel strand connecting disc;
Step2, an anchoring agent is placed in an anchor rod drilling hole, an anchor rod device suitable for fault anchoring is placed in the anchor rod drilling hole, a lower anchor rod is positioned in the anchor rod drilling hole, an upper anchor rod is positioned outside the anchor rod drilling hole, an outer sleeve corresponds to the position of a fault in the anchor rod drilling hole, the anchor rod device suitable for fault anchoring is connected with surrounding rock through anchoring agent anchoring, and the outer end of the upper anchor rod is fixed on the outer wall of the surrounding rock through an anchoring assembly;
And 3, dislocation movement of the anchor rod relative to the upper anchor rod occurs when fault dislocation occurs, the outer sleeve is bent, meanwhile, the second steel strand connecting disc is far away from the first steel strand connecting disc, part or all of steel strands are changed into a tensioning state from a loosening state, the second steel strand connecting disc moves along the axial direction of the yielding cylinder, the pressing sheet is extruded and deformed, and finally the steel strands and the pressing sheet reach a static equilibrium state.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105784590A (en) * | 2016-04-22 | 2016-07-20 | 华北水利水电大学 | Method and device for testing bonding strength of anchoring interface of anchoring system |
| CN215289711U (en) * | 2021-03-05 | 2021-12-24 | 贵阳职业技术学院 | Bridge steel strand anchoring, tensioning and installing structure |
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| AU542884B2 (en) * | 1980-07-31 | 1985-03-21 | Dipl.Ing. Dr. Mont. Franz Powondra | Resilient yieldable device |
| CN101974904B (en) * | 2010-11-05 | 2011-12-28 | 王景军 | Screw anchor rod and processing method using screw anchor rod |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105784590A (en) * | 2016-04-22 | 2016-07-20 | 华北水利水电大学 | Method and device for testing bonding strength of anchoring interface of anchoring system |
| CN215289711U (en) * | 2021-03-05 | 2021-12-24 | 贵阳职业技术学院 | Bridge steel strand anchoring, tensioning and installing structure |
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