CN112302696B - Anchor rod assembly - Google Patents
Anchor rod assembly Download PDFInfo
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- CN112302696B CN112302696B CN202011074021.XA CN202011074021A CN112302696B CN 112302696 B CN112302696 B CN 112302696B CN 202011074021 A CN202011074021 A CN 202011074021A CN 112302696 B CN112302696 B CN 112302696B
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- anchor rod
- anchor
- sleeve
- rod body
- anchoring
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- 239000011435 rock Substances 0.000 claims abstract description 41
- 238000010008 shearing Methods 0.000 claims abstract description 16
- 238000004873 anchoring Methods 0.000 claims description 113
- 239000003795 chemical substances by application Substances 0.000 claims description 34
- 238000003756 stirring Methods 0.000 claims description 26
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 230000006835 compression Effects 0.000 claims description 10
- 238000007906 compression Methods 0.000 claims description 10
- 230000000717 retained effect Effects 0.000 claims 1
- 230000008093 supporting effect Effects 0.000 abstract description 9
- 238000006073 displacement reaction Methods 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 6
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- 229910052751 metal Inorganic materials 0.000 description 3
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- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
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- 229910000838 Al alloy Inorganic materials 0.000 description 1
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- 230000004323 axial length Effects 0.000 description 1
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- 238000001125 extrusion Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
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- 238000005065 mining Methods 0.000 description 1
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- 238000000926 separation method Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 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 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
Abstract
The invention relates to the technical field of mine support, and provides an anchor rod assembly which comprises an anchor rod body, an anchor sleeve and a shearing pin, wherein the anchor sleeve is connected to one end of the anchor rod body and sleeved outside the anchor rod body; the anchor rod body is through the shearing round pin with anchor sleeve pipe fixed connection's fixed state with relieve the shearing round pin is right the anchor sleeve pipe with switch between the regulation state of anchor rod body fixed relation the regulation state, the anchor rod body can be followed the axial displacement of anchor sleeve pipe can be fixed in the anchor sleeve pipe. The length of the anchor rod assembly can be telescopically adjusted, so that the length of the anchor rod assembly extending out of the surface of the surrounding rock of the roadway can be shortened, the problem that the anchor rod is bent by a hydraulic support caused by the exposure of the anchor rod is solved, the supporting effect of the anchor rod is improved, and the supporting safety of the roadway is ensured.
Description
Technical Field
The invention relates to the technical field of mine support, in particular to an anchor rod assembly.
Background
The prestressed anchor rod support is used as a main safe and efficient support mode for coal mine roadways and is widely applied to coal mine roadway support in China. The prestressed anchor rod support is characterized in that anchor rods are anchored in a coal rock body, a rod tail nut is screwed to apply prestress to surrounding rocks, and deformation separation, crushing expansion and slippage of the surrounding rocks of a roadway are restrained by using supporting components such as trays.
The pre-stressed anchor rod supporting construction includes that firstly, a drill bit matched with the diameters of an anchor rod and an anchoring agent is used for punching holes in the anchor rod installation position on the surface of the surrounding rock of the roadway; then, filling an anchoring agent into the drill hole and pushing the anchoring agent to the bottom of the hole, inserting a rod tail threaded connection stirring head into an anchor rod drilling machine, rotationally pushing an anchor rod to stir the anchoring agent, solidifying the anchoring agent after stirring, and bonding and anchoring the rod body of the anchor rod with the hole wall; and (3) removing the rod tail stirring head, paving a metal net, installing steel belts, a tray and other surface protection components, and installing and screwing a rod tail nut to apply prestress on the surrounding rock. Referring to fig. 1, in order to facilitate the bolting construction and meet the requirement of applying prestress to the surrounding rock 4, the prestressed anchor bolt support adopts end anchoring or lengthened anchoring, that is: the used anchoring agent 3 is stirred and then filled in the bottom end of the drill hole for a certain length, the anchor rod 1 forms an anchoring section L2 and a free section L1, the anchoring section L2 provides anchoring force for the anchor rod, and the free section L2 generates prestress for surrounding rock during pre-tightening. Wherein, the total length L of the drill hole 2 is the sum of the anchoring section L2 and the free section L1, and the diameter phi of the drill hole.
Referring to fig. 1, in the installation structure of the prestressed anchor rod supporting system in the related art, when pre-tightening is performed, the axial relative position of the anchor rod 1 in the borehole 2 is not changed, and the rod tail nut 8 of the anchor rod 1 moves axially along the rod body to press the surface protection components such as the tray, the steel strip, the metal mesh and the like on the surrounding rock surface 5 of the top plate. The length of the tail of the anchor rod body extending out of the surface of the surrounding rock is L3 after the anchor rod 1 is pre-tightened, the softer the surface of the surrounding rock, the higher the torque of the nut, and the longer the length of the tail of the anchor rod extending out of the rock surface.
The underground fully mechanized coal mining face of the coal mine uses a hydraulic support 7 to support a top plate. Referring to fig. 2, the hydraulic support 7 is moved and the anchor bar is forced to deform during the support process of the lifting frame. The hydraulic support 7 is arranged in the incision of the anchor rod 1 support, and when the extraction is finished, the hydraulic support 7 enters the support withdrawing channel of the anchor rod 1 support and is withdrawn. The hydraulic support 7 is pushed forward along with the extraction of the working face, and a series of actions such as frame descending, frame moving, frame ascending and the like are completed through the extension and retraction of the hydraulic oil cylinders with various functions. In order to improve the stability of the top plate, a top wiping and moving frame is generally adopted, namely: the top beam of the hydraulic support 7 is moved forward in contact with the surrounding rock surface 5 of the roof (the hollow arrow in fig. 2 indicates the moving direction of the hydraulic support 7). When the hydraulic support 7 moves in the hole cutting and frame withdrawing channel, the top beam of the hydraulic support 7 easily scrapes the exposed end of the anchor rod 1, and the anchor rod 1 is subjected to radial force Fr along the advancing direction of the hydraulic support 7 (refer to the right side view in FIG. 2); when the hydraulic support 7 moves to the right and the hydraulic support rises, the anchor rods 1 are subjected to axial pressing force Fz (refer to the left side view in fig. 2) of the top beam of the hydraulic support 7. In the process of moving and lifting the hydraulic support 7, the anchor rod 1 is exposed to a long length, so that the end part of the anchor rod 1 is bent and even broken easily, the support of the anchor rod 1 fails, and the roadway safety is threatened.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the length of the anchor rod assembly can be adjusted in a telescopic mode, so that the length of the anchor rod assembly extending out of the surface of the surrounding rock of the roadway can be shortened, the problem that the anchor rod is bent by a hydraulic support due to the fact that the anchor rod is exposed is solved, the supporting effect of the anchor rod assembly is improved, and the supporting safety of the roadway is guaranteed.
A bolt assembly according to an embodiment of the invention includes:
an anchor rod body;
the anchoring sleeve is connected to one end of the anchor rod body and sleeved outside the anchor rod body;
and the anchor rod body is in a fixed state of fixedly connecting with the anchoring sleeve through the shearing pin and is released, the shearing pin is switched between the adjusting states of the fixed relation of the anchoring sleeve and the anchor rod body, and the anchor rod body can move axially and can be fixed in the anchoring sleeve.
According to one embodiment of the invention, a connecting piece is fixed in the anchoring sleeve, the anchor rod body is connected with the anchoring sleeve through the connecting piece, and the anchor rod body is in threaded connection with the connecting piece.
According to one embodiment of the invention, the first end of the anchoring sleeve for connecting the anchor rod body is provided with a limiting step, and the connecting piece is limited on the limiting step to prevent the connecting piece from moving out of the first end.
According to one embodiment of the invention, the connecting element is fixedly connected to the anchoring sleeve by a fixing pin which extends through the anchoring sleeve.
According to one embodiment of the invention, the first end of the anchoring sleeve for connecting the anchor rod body is provided with a collar.
According to one embodiment of the invention, a stirring compression ring is sleeved on the second end of the anchoring sleeve for stirring the anchoring agent, a protrusion is arranged on the periphery of the stirring compression ring, and a pipe plug is arranged in the second end.
According to one embodiment of the invention, the end of the anchor rod remote from the anchoring sleeve is configured with a connector.
According to one embodiment of the invention, a side of the connector facing the anchoring sleeve is provided with a self-aligning spherical washer and a flat-bottom dished tray, and the self-aligning spherical washer extends into a conical hole in the center of the flat-bottom dished tray.
According to an embodiment of the invention, the flat-bottomed dish-shaped tray is circumferentially provided with a first protruding part protruding towards the connecting head, and the first protruding part surrounds the self-aligning spherical washer.
According to one embodiment of the invention, a steel strip is arranged on one side of the flat-bottom dish-shaped tray, which is away from the connector, and the steel strip is attached to the top plate.
One or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:
the anchor rod assembly provided by the embodiment of the invention comprises an anchor rod body, an anchoring sleeve and a shearing pin, wherein the relation between the anchor rod body and the anchoring sleeve can be adjusted through the shearing pin; when the shearing pin is fixedly connected with the anchor rod body and the anchoring sleeve, the anchor rod body and the anchoring sleeve are axially limited, the anchor rod body and the anchoring sleeve can synchronously move towards the drilled hole, so that the outer wall of the anchoring sleeve can be anchored with the anchoring agent; after the anchor sleeve pipe used the anchoring agent to accomplish the anchor, continue to provide the rotation effort to the stock body of rod, make the shear pin cut, the stock body of rod can continue to rotate and can follow the axial displacement of anchor sleeve pipe for the anchor sleeve pipe, make the length of stock subassembly shorten, so that the length that the stock subassembly stretches out the tunnel country rock surface shortens, solve hydraulic support and moving the frame and rise the frame process, because the stock subassembly exposes long, cause the crooked even problem of rupture of stock subassembly tip and stock subassembly to strut the inefficacy easily, promote tunnel security.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art construction of a rock bolt for anchoring surrounding rock;
FIG. 2 is a schematic diagram illustrating the relationship between a hydraulic support and the tail of an anchor rod during movement of the hydraulic support in the prior art;
FIG. 3 is a schematic structural view of the anchor assembly anchored to the surrounding rock according to an embodiment of the present invention;
fig. 4 is a schematic view of a connection of a bolt body and an anchor sleeve of a bolt assembly according to an embodiment of the present invention;
FIG. 5 isbase:Sub>A schematic cross-sectional view A-A of FIG. 4;
FIG. 6 is a schematic cross-sectional view of B-B in FIG. 4;
FIG. 7 is a schematic cross-sectional view of C-C of FIG. 4;
FIG. 8 is a schematic cross-sectional view of D-D of FIG. 4;
FIG. 9 is a schematic cross-sectional view of E-E in FIG. 4;
fig. 10 is a schematic view of the anchor rod body of the anchor assembly provided by an embodiment of the present invention; wherein the free segment is broken to show the structure of each part;
FIG. 11 is a bottom view of the structure of FIG. 10;
fig. 12 is a structural schematic view of an anchor sleeve of a rock bolt assembly provided by an embodiment of the invention; the figure is a half-section state;
FIG. 13 is an enlarged partial view of the structure of FIG. 12 at the point F;
fig. 14 is a cross-sectional structural view of a flat bottom dish tray of the anchor assembly provided by an embodiment of the invention;
fig. 15 is a bottom view of a flat bottom saucer shaped tray with anchor assemblies according to an embodiment of the present invention.
Reference numerals:
1: an anchor rod; 2: drilling; 3: an anchoring agent; 4: surrounding rocks of the roadway; 5: the surface of the surrounding rock; 7: a hydraulic support; 8: a rod tail nut;
100: an anchor rod body; 110: a threaded segment; 120: a free section; 130: a connector; 140: a first mounting hole;
200: anchoring the casing; 210: a first stage; 220: a second section; 230: a limiting step; 240: a first fixing groove; 250: stirring and pressing a ring; 260: a retainer ring; 270: pipe blocking;
300: a connecting member; 310: a second mounting hole;
400: a shear pin; 500: a fixing pin;
600: a steel belt; 610: a second projection;
700: a flat bottom dish-shaped tray; 710: a tapered hole; 720: a first projecting portion;
800: a self-aligning spherical washer.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "central", "longitudinal", "lateral", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only used for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, a first feature may be "on" or "under" a second feature such that the first and second features are in direct contact, or the first and second features are in indirect contact via an intermediary. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
One embodiment of the present invention, shown in conjunction with fig. 3-15, provides a bolt assembly including a bolt body 100, an anchor sleeve 200, and a shear pin 400; the anchor sleeve 200 is connected to one end of the anchor rod body 100 and sleeved outside the anchor rod body 100; the anchor rod body 100 is switched between a fixed state of being fixedly connected to the anchor sleeve 200 by the shear pin 400 and an adjusted state of releasing the fixed relation of the anchor sleeve 200 and the anchor rod body 100 by the shear pin 400, and in the adjusted state, the anchor rod body 100 can move in the axial direction of the anchor sleeve 200 and can be fixed in the anchor sleeve 200.
One end of the anchor rod 100 is connected to the anchor sleeve 200 and the overall length of the anchor assembly is adjustable by the length of the anchor rod 100 extending into the anchor sleeve 200. Specifically, the anchor rod body 100 and the anchor sleeve 200 are connected by the shear pin 400, and when the anchor rod body 100 and the anchor sleeve 200 are fixed by the shear pin 400 (in a fixed state), the anchor rod body 100, the anchor sleeve 200 and the shear pin 400 are fixed as a whole, the drilling machine is connected to the other end of the anchor rod body 100, the anchor rod body 100 and the anchor sleeve 200 can be driven by the drilling machine to move into the borehole 2, and the anchor sleeve 200 and the anchor rod body 100 drive and stir the anchoring agent 3 into the anchoring agent 3, so that the anchor sleeve 200 and the anchoring agent 3 are stably anchored. After the anchoring sleeve 200 and the anchoring agent 3 are stably anchored, the drilling machine continues to move to drive the anchor rod body 100 to rotate (in an adjusting state), the anchor rod body 100 and the anchoring sleeve 200 rotate relatively, at the moment, the rotating acting force of the anchor rod body 100 relative to the anchoring sleeve 200 is converted into a shearing acting force acting on the shearing pin 400, so that the shearing pin 400 is sheared, after the shearing pin 400 is sheared, the anchoring sleeve 200 is still fixed in the anchoring agent 3, the anchor rod body 100 can continue to rotate relative to the anchoring sleeve 200 and extend into the anchoring sleeve 200, and the anchor rod body 100 is fixed at the position in the anchoring sleeve 200 after the anchor rod body 100 extends into, so that the distance of the anchor rod assembly extending out of the surrounding rock surface 5 of the roadway is shortened, the problems that the end part of the anchor rod assembly is bent or even broken and the support of the anchor rod assembly is prone to fail in the processes of moving and lifting the hydraulic support 7 are solved, and the roadway safety is improved.
Wherein, the stock body of rod and the anchor sleeve pipe in-process of stretching into to the drilling, need overcome the resistance of anchoring agent, the resistance of anchoring agent can be overcome to the intensity of shearing round pin to, after anchor sleeve pipe and anchoring agent carry out the anchor, the shearing round pin still need satisfy and can be cut off by the rotational force of the stock body of rod. The shear pin can be made of aluminum materials such as aluminum alloy, and other materials capable of meeting the stress requirements of the shear pin can be made of the aluminum materials.
The anchor rod assembly has the anchor rod support advantage of conventional prestress, can apply prestress to surrounding rock of a roadway, and realizes timely and active support in the tunneling process; and also realizes the axial length L of the anchor rod component Z And then the length L of the anchor rod assembly extending out of the surface 5 of the surrounding rock of the roadway 3 Shorten, hydraulic support 7 moves the frame and rises a in-process, and hydraulic support 7 is little to the influence of the tip of stock subassembly, and then has guaranteed the anchor effect of stock subassembly.
In one embodiment, referring to fig. 4, 6, 10 and 12, a connector 300 is fixed inside the anchor sleeve 200, and the anchor rod 100 is connected to the anchor sleeve 200 through the connector 300, and the anchor rod 100 is threadedly connected to the connector 300. The anchor rod body 100 is in threaded connection with the connecting piece 300, so that the rotation, extension and contraction adjustment of the anchor rod body 100 and the anchor sleeve 200 is realized, and the structure is simple. And the rotation of the drilling machine can realize the adjustment of the anchor rod body 100 and the anchor sleeve 200, and the adjustment is simple and convenient.
And adopt the stock subassembly of this embodiment, the structure of anchor sleeve 200 and surrounding rock anchor, the axial atress of the stock body of rod 100 is transmitted for anchor sleeve 200, and the axial atress of the stock body of rod 100 is transmitted for anchor sleeve 200 through connecting piece 300, and anchor sleeve 200 is in the axial compression state, and can not produce radial contraction between 3 with the anchor agent for anchor sleeve 200 can not break away from with anchor agent 3, and the anchor structure is more stable. Compared with the prior art, when the tunnel surrounding rock is crushed and expanded to deform, the anchor rod is axially stretched and extended and radially contracted; the conventional anchor rod starts from the end part of the anchoring section, and the radial shrinkage deformation of the anchor rod is caused by the axial tension force action of the anchor rod, so that the anchor rod is separated from the anchoring agent 3; along with the increase of the stress deformation, the radial deformation of the anchor rod develops towards the inside of the anchoring end, the effective anchoring length is gradually reduced, and the anchoring stability is reduced along with the effective anchoring length.
In addition, the anchoring and pre-tightening screwing directions of the anchor rod body 100 are consistent with the screwing directions of the threads, so that the anchor rod is suitable for construction of existing machines and tools. The installation process of the anchor rod body 100 is simplified, the stirring structure at the end part of the anchoring sleeve 200 does not need to be installed and disassembled, and the anchoring and pre-tightening construction is continuously completed after the sleeve is connected with a drilling machine. The drilling machine drives the anchor rod body 100 to rotate until the torque reaches the designed value, the drilling machine is withdrawn, and the anchoring installation construction is finished.
Referring to fig. 6 and 10, the anchor rod body 100 includes a threaded section 110 and a free section 120 connected to one end of the threaded section 110, the threaded section 110 is in threaded connection with a threaded hole formed through the connector 300, a first mounting hole 140 is formed in one end of the threaded section 110, which is far away from the free section 120, the connector 300 is provided with a second mounting hole 310, and the shear pin 400 penetrates through the first mounting hole 140 and the second mounting hole 310 to connect the anchor rod body 100 and the connector 300, so that the connection is simple and convenient. The connection mode of the connecting member 300 and the anchoring sleeve 200 may be a threaded connection, a welded connection, a pin connection, etc., and the connection mode is various and can be selected as required. The anchor sleeve 200 is manufactured using a hot-rolled steel pipe or a cold-drawn steel pipe. Referring to fig. 4 and 8, the outer diameter of the free section 120 is slightly smaller than the inner diameter of the second section 220 of the anchoring sleeve in the embodiments described below, so as to avoid contact resistance between the anchor rod body and the anchoring sleeve.
Wherein, punch at the stock mounted position, the degree of depth of drilling 2 is stock subassembly total length L Z The length l of the threaded section 110 of the bolt body 100 0 The difference is that the anchoring agent 3 is filled after the hole is formed.
In one embodiment, the first end of the anchor sleeve 200 for connecting the bolt body 100 is provided with a limit step 230, and the connecting member 300 is limited at the limit step 230 to prevent the connecting member 300 from moving out of the first end. When the anchor rod body 100 is acted by the axial tension, the connecting member 300 transmits the axial tension to the anchor rod body 100 and acts on the limit step 230 to enable the second section of the anchor sleeve 200 to be in an axial compression state, the anchor sleeve 200 radially expands and forms extrusion with the anchoring agent 3, so that the anchor sleeve 200 cannot be separated from the anchoring agent 3, and the anchoring structure is more stable.
Wherein, the anchoring sleeve 200 comprises a first section 210 and a second section 220, the inner diameter of the second section 220 is smaller than that of the first section 210, so as to form a limit step 230 between the first section 210 and the second section 220, the limit step 230 prevents the connecting element 300 from moving from the first section 210 to the second section 220, and the connecting element 300 transmits the received axial force of the anchor rod body 100 to the anchoring sleeve 200 through the limit step 230. The outer diameters of the first section 210 and the second section 220 may be the same or different according to actual needs. The first section 210 and the second section 220 of the anchor sleeve 200 both have an outer diameter Φ 1 And is conveniently inserted into the bore 2, the diameter of the bore 2 is slightly larger than the outer diameter phi of the anchoring sleeve 200 1 The borehole 2 uses a diameter (phi) larger than the diameter of the anchoring sleeve 200 1 ) Constructing a drill bit with the diameter of 4-6 mm.
In one embodiment, referring to fig. 4 and 7, the connection member 300 is fixedly connected to the anchor sleeve 200 by a fixing pin 500 penetrating through the anchor sleeve 200, and the fixing pin 500 fixedly connects the anchor sleeve 200 to the connection member 300, which is simple in structure and easy to install.
Wherein, set up first fixed slot 240 on the anchor sleeve 200, set up the second fixed slot on the connecting piece 300, first fixed slot 240 forms the round hole with the cooperation of second fixed slot, makes things convenient for fixed pin 500 to insert anchor sleeve 200 and connecting piece 300. Two fixing pins 500 are symmetrically arranged on both sides of the axis of the anchor bushing 200, or a plurality of fixing pins 500 are uniformly arranged in the circumferential direction of the anchor bushing 200.
In one embodiment, as shown in fig. 4 and 9, a first end of the anchor sleeve 200 for connecting the anchor rod 100 is sleeved with a retainer ring 260, a second end opposite to the first end is used for stirring the anchoring agent 3, and the second end of the anchor sleeve 200 allows the anchor assembly to extend into and stir the anchoring agent 3. The retainer ring 260 serves to block the flow of the anchoring agent 3 toward the lower portion of the drilled hole 2, and the outer diameter Φ of the retainer ring 260 3 Greater than the outer diameter phi of the anchoring sleeve 200 1 Outer diameter Φ of the retainer ring 260 3 Slightly smaller than the diameter of bore 2 to ensure that the retaining ring 260 can enter bore 2.
In general, the length of the anchoring sleeve 200 is the same as the preset anchoring length of the surrounding rock of the roadway, and the anchoring sleeve 200 plays an anchoring role, so that the anchoring effect of the anchor rod assembly is ensured.
In one embodiment, the second end of the anchoring sleeve 200 for stirring the anchoring agent 3 is sleeved with a stirring press ring 250, the periphery of the stirring press ring 250 is provided with a protrusion, the protrusion plays a role in stirring the anchoring agent, and the contact area between the stirring press ring 250 and the anchoring agent 3 is increased.
After the annular stirring compression ring 250 is sleeved on the anchoring sleeve 200, the protrusion can be formed by compressing and deforming the hydraulic mechanism, and as shown in fig. 5, the outer periphery of the anchoring sleeve 200 also forms a protruding structure due to the acting force of the hydraulic mechanism. The bulges are uniformly distributed on the circumferential direction of the stirring compression ring 250, so that the stirring compression ring 250 can uniformly stir the anchoring agent 3, and meanwhile, the stirring compression ring 250 enables the central line of the anchoring sleeve 200 to be close to the central line of the drilled hole, so that the anchoring sleeve 200 is prevented from being unevenly anchored. Referring to fig. 4 and 5, the outer diameter of the protruding portion of the agitating collar 250 is Φ 2 。
Meanwhile, a pipe plug 270 is arranged in the second end, and the pipe plug 270 is used for sealing the second end of the anchoring sleeve 200 so as to prevent the anchoring agent 3 from entering the anchoring sleeve 200.
In one embodiment, as shown in fig. 4, 10 and 11, the end of the bolt body 100 remote from the anchor sleeve 200 is configured with a connector 130, the connector 130 being adapted to be connected to a drill to facilitate installation of the bolt assembly by the drill. And the connector 130 is also used for axially limiting the watch protection component, so as to play a role of pre-tightening.
Wherein, the anchor rod body 100 is a long bolt type structure, the total length of the threaded section 110, the free section 120 and the connector 130 of the anchor rod body 100 is l, the length of the threaded section 110 is l 0 The length of the threaded section 110 is adapted to the length of the first section 210 of the anchor sleeve 200 to ensure that the threaded section 110 can move within the first section 210.
Of course, the connector 130 can be detachably connected to the anchor rod body 100, so as to be conveniently disassembled, assembled and replaced, thereby being suitable for drilling machines with various specifications.
The connector is a hexagonal head located at the tail of the anchor rod body 100, the connector is connected with a drilling machine through a sleeve, the drilling machine is started to drive the anchor rod body 100 to rotate and push towards the inside of the drill hole 2 at the same time until the anchoring sleeve 200 contacts the bottom surface of the drill hole 2, and the resin anchoring agent 3 is stirred according to the specification. The anchor rod body 100 may be made of steel bars such as round steel and screw steel of various materials according to the strength requirement of the support.
In one embodiment, referring to fig. 3, 14 and 15, the side of the connection head 130 facing the anchoring sleeve 200 is provided with a self-aligning spherical washer 800 and a flat-bottomed dish-shaped tray 700, and the self-aligning spherical washer 800 extends into a tapered hole 710 in the center of the flat-bottomed dish-shaped tray 700. The thickness of flat-bottomed dish-shaped tray 700 is little for the arch tray to reduce the component height outside the surrounding rock surface of roadway 5, and then the length that the tail end of stock subassembly stretches out surrounding rock surface of roadway 5 further shortens. And the flat-bottomed dish-shaped tray 700 is matched with the self-aligning spherical washer 800, so that the angle change between the axis of the drilling hole 2 and the normal line of the surrounding rock surface 5 of the roadway can be adjusted, the bottom surface of the tray is integrally attached to the surrounding rock surface 5 of the roadway, and the deformation of the surrounding rock surface of the roadway is restrained. The diameter of the tapered hole 710 in the center of the flat-bottomed dish-shaped tray 700 is matched with the maximum diameter of the anchor rod body 100, and the taper angle beta of the tapered hole 710 is matched with the shape of the self-aligning spherical washer 800.
In one embodiment, referring to fig. 4, 14 and 15, the flat-bottomed dish-shaped tray 700 is provided with a first protrusion 720 protruding toward the connecting head 130 in the circumferential direction, and the first protrusion 720 surrounds the self-aligning spherical washer 800, so that the bending resistance of the flat-bottomed dish-shaped tray is significantly enhanced, and the flat-bottomed dish-shaped tray 700 is prevented from bending and deforming when the surrounding rock is deformed.
Wherein, the distance from the highest position of the first convex part in the convex direction to the surface of the opposite side of the flat-bottom dished tray is h, the flat-bottom dished tray is of a plate-shaped structure, and the thickness of the flat-bottom dished tray is h 0 The flat-bottom dish-shaped tray is rectangular.
Of course, the surface 5 of the surrounding rock of the roadway can also be paved with surface protection components such as metal meshes and steel strips 600, and the supporting effect of the anchor rod assembly is enhanced. The second protrusion 610 is disposed on the steel strip 600 to improve the bending resistance of the steel strip 600.
When the anchor assembly of the above embodiment is assembled, the free section 120 of the anchor rod body 100 is sequentially sleeved into the self-aligning spherical washer 800, the saucer-shaped tray 700 and the steel band 600, a section of the threaded section 110 of the anchor rod body 100, which is far away from the free section 120, is inserted into the anchor sleeve 200 along the first end of the anchor sleeve 200 and extends out to the second end of the anchor sleeve 200, so that the anchor rod body 100 and the connecting member 300 are fixedly connected through the shear pin 400, then the anchor rod body 100 is pulled downwards, so that the connecting member 300 is limited at the limit step 230, the connecting member 300 and the anchor sleeve 200 are fixedly connected through the fixing pin 500, the second end pipe orifice of the anchor sleeve 200 is installed into the pipe plug 270, the first end of the anchor sleeve 200 is sleeved with the retaining ring 260, the second end is sleeved with the stirring press ring 250, and the total length L after the anchor rod assembly is assembled Z . The bolt assembly can be inserted into the borehole 2 for anchoring.
The anchor rod assembly in the embodiment meets the requirements of anchoring and pre-tightening, and meanwhile, the length L of the anchor rod assembly exceeding the surrounding rock surface 5 of the roadway can be effectively shortened 3 The device can be used for supporting various roadways; the structure size of the anchor rod assembly outside the surrounding rock surface 5 of the roadway can be obviously reduced, the support is particularly suitable for top plate support of a cut-out and frame-removal channel, damage to the anchor rod assembly caused by the frame moving and lifting processes of the hydraulic support 7 due to the fact that the anchor rod is exposed for too long is avoided, the support reliability of the anchor rod assembly is obviously improved, and the support safety of the roadway is ensured.
The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.
Claims (9)
1. A bolt assembly, comprising:
an anchor rod body;
the anchoring sleeve is connected to one end of the anchor rod body and sleeved outside the anchor rod body;
the anchor rod body is switched between a fixed state of fixedly connecting with the anchoring sleeve through the shearing pin and an adjusting state of releasing the fixed relation of the shearing pin to the anchoring sleeve and the anchor rod body, and in the adjusting state, the anchor rod body can move along the axial direction of the anchoring sleeve and can be fixed in the anchoring sleeve;
a connecting piece is fixed in the anchoring sleeve, the anchor rod body is connected with the anchoring sleeve through the connecting piece, and the anchor rod body is in threaded connection with the connecting piece;
the anchor rod body of rod includes the screw thread section and connects in the free section of screw thread section one end, the screw thread section with the screw hole threaded connection that the connecting piece link up, the screw thread section is kept away from the one end of free section and is seted up first mounting hole, the connecting piece is equipped with the second mounting hole, cut the round pin and run through first mounting hole with the second mounting hole is in order to connect anchor rod body of rod and connecting piece.
2. The anchor rod assembly of claim 1, wherein the first end of the anchor sleeve for engaging the anchor rod defines a stop step, and wherein the connector is retained by the stop step to prevent the connector from moving out of the first end.
3. A rock bolt assembly according to claim 1, wherein the connector is fixedly connected to the anchoring sleeve by a fixing pin extending through the anchoring sleeve.
4. A bolt assembly according to claim 1, wherein the first end of the anchor sleeve for connection to the bolt body is provided with a collar.
5. The anchor rod assembly of claim 1, wherein the second end sleeve of the anchoring sleeve for stirring the anchoring agent is provided with a stirring compression ring, the periphery of the stirring compression ring is provided with a protrusion, and the second end is internally provided with a pipe plug.
6. A rock bolt assembly according to any one of claims 1 to 5, wherein the end of the rock bolt shank remote from the anchoring sleeve is configured with a connector.
7. A rock bolt assembly according to claim 6, wherein a self-aligning spherical washer and a dish-shaped pan are provided on the side of the connector facing the anchoring sleeve, the self-aligning spherical washer extending into a tapered hole in the centre of the dish-shaped pan.
8. The anchor rod assembly of claim 7, wherein the flat-bottomed dish-shaped tray is circumferentially provided with a first protrusion protruding in the direction of the connector, and the first protrusion surrounds the self-aligning spherical washer.
9. A rock bolt assembly according to claim 7, wherein the side of the flat-bottomed dish-shaped tray facing away from the connector is provided with a steel band which is attached to a top plate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011074021.XA CN112302696B (en) | 2020-09-30 | 2020-09-30 | Anchor rod assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011074021.XA CN112302696B (en) | 2020-09-30 | 2020-09-30 | Anchor rod assembly |
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| CN112302696A CN112302696A (en) | 2021-02-02 |
| CN112302696B true CN112302696B (en) | 2023-02-28 |
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| CN103541750A (en) * | 2013-10-21 | 2014-01-29 | 辽宁工程技术大学 | Alternately-distributed energy-absorbing overlength combined anchor rod for mining and application method |
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| CN110410123A (en) * | 2019-08-15 | 2019-11-05 | 河南理工大学 | A kind of New Coal Mine High Strength Roof Bolt Support equipment |
| CN111502720A (en) * | 2020-05-28 | 2020-08-07 | 淮南矿业(集团)有限责任公司 | Solid anchor rod capable of grouting |
| CN211500690U (en) * | 2020-01-03 | 2020-09-15 | 宁夏煤海机械制造有限责任公司 | Twist type resin anchor rod metal rod body |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1723330A (en) * | 2003-01-30 | 2006-01-18 | 阿特拉斯科普科凿岩机股份公司 | Coupling sleeve for connection of a threaded rock bolt to an impact rock drilling machine |
| CN103541750A (en) * | 2013-10-21 | 2014-01-29 | 辽宁工程技术大学 | Alternately-distributed energy-absorbing overlength combined anchor rod for mining and application method |
| CN105350994A (en) * | 2015-10-28 | 2016-02-24 | 天地科技股份有限公司 | Grouting anchor and using method thereof |
| CN206903682U (en) * | 2017-07-12 | 2018-01-19 | 广西路桥工程集团有限公司 | One kind increases resistance pressure-relieving achor bar |
| CN110410123A (en) * | 2019-08-15 | 2019-11-05 | 河南理工大学 | A kind of New Coal Mine High Strength Roof Bolt Support equipment |
| CN211500690U (en) * | 2020-01-03 | 2020-09-15 | 宁夏煤海机械制造有限责任公司 | Twist type resin anchor rod metal rod body |
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| CN112302696A (en) | 2021-02-02 |
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