CN109751068A - High pre-stress equal strength anchor rod nut - Google Patents
High pre-stress equal strength anchor rod nut Download PDFInfo
- Publication number
- CN109751068A CN109751068A CN201711120594.XA CN201711120594A CN109751068A CN 109751068 A CN109751068 A CN 109751068A CN 201711120594 A CN201711120594 A CN 201711120594A CN 109751068 A CN109751068 A CN 109751068A
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- China
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- nut
- inner sleeve
- overcoat
- screw thread
- thread
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Abstract
The present invention relates to anchor nuts, the anchor nut includes nut inner sleeve and nut overcoat, the nut overcoat is socketed in the nut outside of inner cover, the inner surface of the nut inner sleeve be provided with etc. the nut inner sleeve internal screw thread that matches of the strong full-thread bolt body of rod, the outer surface of the nut inner sleeve is provided with nut inner sleeve external screw thread, the inner surface of the nut overcoat is provided with nut overcoat internal screw thread, and the nut overcoat internal screw thread is matched with the nut inner sleeve external screw thread；The externally threaded screw pitch of nut inner sleeve is less than the strong full-thread bolt body of rod screw pitch such as described.The present invention provides a kind of high pretightening force equal strength anchor rod nut that the rigidity of support system is improved by the strong full-thread bolt pretightning force such as raising.
Description
Technical field
The present invention relates to roadway support tool more particularly to a kind of high pre-stress equal strength anchor rod spiral shells for improving supporting intensity
It is female.
Background technique
Rockbolt installation prestressing force is to the effect at joint, stratification, crack discontinuity surface: providing axial force by anchor pole and cuts
Xiang Li reduces the reduction of discontinuity surface shearing strength, prevents absciss layer and sliding.Original intensity, complete of coal and rock is kept as far as possible
Property.Anchor pole applies compression to country rock, improves surrouding rock stress state.For tensile zone, part tensile stress can be offset, raising is enclosed
Rock tensile capacity；For by share zone, the frictional force generated by compression prevents to slide between country rock stratification, improves country rock
Shear resistance.
Etc. strong full-thread bolt compared with common bolt, there is processing and manufacturing simply, easy for installation, anchor infuses qualification rate height,
The advantages that adaptable；Etc. strong full-thread bolt since the whole body is all with screw thread, expansion cuts out outer segment when repairing, and still can install spiral shell
Mother continues to use.Big etc. strong full-thread bolt body of rod screw pitch, for screw pitch usually in 10~12mm or so, thread pitch is big, and installation is pre-
Stress is low, and rockbolt installation prestressing force is small, still belongs to passive protecting, not can control country rock early stage absciss layer, and Surrounding Rock Strength and globality are bright
It is aobvious to reduce, there is moderate finite deformation and support system is caused to destroy；Meanwhile waiting strong full-thread bolt and the coarse frictional force of nut surface
Greatly, part torque is offset when fastening, reduces the pretightning force of anchor pole, and under same torque, the big pretightning force of screw pitch is small, waits strong full thread
Anchor pole screw pitch is big, smaller than common bolt pretightning force under same torque.At present due to etc. strong full-thread bolt prestressed it is low
The strength reduction of support system is caused, the promotion and application of the strong full-thread bolt of equity are very limited, so that waiting strong full spiral shell
The danger on the verge of being replaced of line anchor pole.Now there is an urgent need to a kind of nuts that the strong full-thread bolt prestressed such as can be improved.
Summary of the invention
It is an object of the invention to overcome the above-mentioned small disadvantage of strong full-thread bolt pretightning force such as existing in the prior art
A kind of high pre-stress equal strength anchor rod nut improving support system intensity by the strong full-thread bolt pretightning force such as raising is provided.
The technical scheme of the present invention is realized as follows: anchor nut, which includes outside nut inner sleeve and nut
Set, the nut overcoat are socketed in the nut outside of inner cover, the inner surface of the nut inner sleeve be provided with etc. strong full thread
The nut inner sleeve internal screw thread that anchor rod body matches, the outer surface of the nut inner sleeve is provided with nut inner sleeve external screw thread, described
The inner surface of nut overcoat is provided with nut overcoat internal screw thread, the nut overcoat internal screw thread and the nut inner sleeve external screw thread phase
Cooperation；The externally threaded screw pitch of nut inner sleeve is less than the screw pitch of the strong full-thread bolt body of rod screw thread such as described.
The lower end of the nut inner sleeve is provided with the inner sleeve head that cross section is hexagon, circumscribed circle where the hexagon
Diameter is greater than the internal diameter of the nut overcoat；The cross section of the nut overcoat is hexagon, inner sleeve head circumscribed circle
Diameter is less than the nut overcoat inscribe diameter of a circle.
The screw pitch of the strong full-thread bolt body of rod screw thread such as described is 10~12 millimeters；The nut inner sleeve external screw thread is closely-pitched
Screw thread, the screw pitch of the fine thread are 2 millimeters.
Nut inner sleeve position identical with the nut overcoat offers a positioning hole, the positioning hole setting
One positioning pin.
The length of the nut inner sleeve is greater than 3~5 millimeters of length of the nut overcoat.
The good effect that technical solution of the present invention generates is as follows: the anchor nut includes outside nut inner sleeve and nut
Set, the inner surface of the nut inner sleeve be provided with etc. the nut inner sleeve internal screw thread that matches of the strong full-thread bolt body of rod, nut
Inner sleeve can with etc. the strong full-thread bolt body of rod be threaded, the outer surface of the nut inner sleeve be provided with in nut overcoat
The external screw thread that the internal screw thread on surface matches is threaded between nut overcoat and nut inner sleeve, outside the nut inner sleeve
Thread pitch is less than the screw pitch of the strong full-thread bolt body of rod screw thread such as described, and under same torque, the small then prestressing force of screw pitch is big, passes through
The prestressing force of fine pitch screw thread enhancing nut between nut inner sleeve and nut overcoat, and then improve the strong of entire support system
Degree.
Nut inner sleeve position identical with the nut overcoat offers a positioning hole, the positioning hole setting
One positioning pin, it is easy for installation, fastening nut inner sleeve and fastening nut housing can be made to be continuously finished, do not need to change box spanner.
In use, driving positioning pin by torque nut housing, positioning pin drives nut inner sleeve, and nut inner sleeve is waiting strong full-thread bolt
Upper rotation, i.e. anchor nut rotate on waiting strong full-thread bolt body of rod.Anchor nut revolves on waiting strong full-thread bolt body of rod
It rotates into and adjusts and waiting the position on the strong full-thread bolt body of rod, when nut inner sleeve top to anchor disk generates pretightning force, pull anchor
The torque of stem nut increases, when torque, which increases to, to cut positioning pin, the nut inner sleeve of anchor nut and nut overcoat
Shear stress cuts positioning pin.Under same torque, the small pretightning force of screw pitch is big, the screw thread spiral shell of nut inner sleeve and nut overcoat cooperation
Away from be less than nut inner sleeve with etc. strong full-thread bolt body of rod screw thread screw pitch, when positioning pin cut retrotorsion anchor nut housing,
Nut overcoat and nut inner sleeve relative torsion, nut overcoat torsion continue growing pretightning force, it is easy to reach design pretightning force.
Nut inner sleeve be provided with etc. the matched internal screw thread of the strong full-thread bolt body of rod, can arbitrarily adjust and wait strong full spiral shell
Position on line anchor rod body；The lower end of the nut inner sleeve is provided with the nut inner sleeve head of hexagon, hexagon place
External diameter of a circle is greater than the internal diameter of the nut overcoat；Inner sleeve head can block nut overcoat at work, work as positioning pin
Need to dismantle after cutting anchor nut when, torque nut housing counterclockwise cannot continue when nut overcoat withstands inner sleeve head
Individually torsion, nut overcoat drive nut inner sleeve to reverse counterclockwise, anchor nut from etc. lay down on the strong full-thread bolt body of rod；
When after positioning pin cutting needing that anchor nut is installed, inner sleeve head is reversed clockwise with spanner, it is suitable when motionless with spanner torsion
Hour hands torque nut housing, anchor nut housing internal screw thread and inner sleeve external screw thread generate relative torsion, nut overcoat top to anchor disk；
Anchor nut housing internal screw thread and inner sleeve external screw thread are closely-pitcheds, and screw pitch is small, and pretightning force is big, and nut overcoat torsion continues growing pre- answer
Power, until reaching design prestressing force.
Etc. strong full-thread bolt body of rod thread pitch in 10~12mm or so, the nut inner sleeve and nut overcoat of anchor nut
Between screw thread fine thread, screw pitch 2mm, under same torque, the big pretightning force of screw pitch is small, utilizes the nut of anchor nut
Fine pitch screw thread between inner sleeve and nut overcoat, substantially increases pretightning force.
The length of the nut inner sleeve is greater than the length of the nut overcoat, in order to and allow inner sleeve first to push up to anchor disk,
Torque nut housing clockwise is avoided, housing is first pushed up to anchor disk, is unfavorable for cutting positioning pin.
Detailed description of the invention
Fig. 1 is cutting structural schematic diagram when equal strength anchor rod nut of the present invention is not up to pretightning force.
Fig. 2 is cutting structural schematic diagram when equal strength anchor rod nut of the present invention reaches pretightning force.
Fig. 3 is nut inner sleeve and one of the cross section cut away view after nut overcoat socket in the present invention.
Fig. 4 is nut inner sleeve and two of the cross section cut away view after nut overcoat socket in the present invention.
Marked in figure are as follows: 1, etc. the strong full-thread bolt body of rod；2, anchor disk；3, nut inner sleeve；31, inner sleeve head；4, nut
Housing；5, positioning pin.
Specific embodiment
High pre-stress equal strength anchor rod nut, as shown in Figure 1, 2, including etc. the strong full-thread bolt body of rod 1, anchor disk 2 and anchor pole
Nut, the anchor nut include nut inner sleeve 3 and nut overcoat 4, and the nut overcoat is socketed in the nut outside of inner cover,
The inner surface of the nut inner sleeve be provided with etc. the nut inner sleeve internal screw thread that matches of the strong full-thread bolt body of rod, the nut
The outer surface of inner sleeve is provided with nut inner sleeve external screw thread, and the inner surface of the nut overcoat is provided with nut overcoat internal screw thread, institute
Nut overcoat internal screw thread is stated to match with the nut inner sleeve external screw thread；The externally threaded screw pitch of nut inner sleeve is less than described etc.
The screw pitch of strong full-thread bolt body of rod screw thread.
The anchor nut includes nut inner sleeve and nut overcoat, and the inner surface of the nut inner sleeve is provided with strong complete with grade
The nut inner sleeve internal screw thread that the threaded anchor rod body of rod matches, nut inner sleeve can with etc. the strong full-thread bolt body of rod pass through screw thread join
It connects, the outer surface of the nut inner sleeve is provided with the external screw thread matched with the internal screw thread of nut overcoat inner surface, nut overcoat
It is threaded between nut inner sleeve, the nut inner sleeve external screw thread screw pitch is less than the strong full-thread bolt body of rod spiral shell such as described
The screw pitch of line, the small then prestressing force of screw pitch is big, enhances the pre- of nut by the fine pitch screw thread between nut inner sleeve and nut overcoat
Stress, and then improve the intensity of entire support system.
As shown in Figure 3,4, the lower end of the nut inner sleeve is provided with the inner sleeve head 31 that cross section is hexagon, six side
External diameter of a circle is greater than the internal diameter of the nut overcoat where shape, and inner sleeve head can block nut overcoat at work, make
Nut overcoat cannot be back-outed from nut inner sleeve lower end, and the length of the nut inner sleeve is greater than the length of the nut overcoat, the two
Length difference is away from being 3~5 millimeters, in order to allow inner sleeve first to push up to anchor disk, avoid torque nut housing clockwise, housing first pushes up
To anchor disk, it is unfavorable for cutting positioning pin；After nut inner sleeve top is to anchor disk, continue torque nut housing clockwise, equity is strong complete
Threaded anchor rod applies pretightning force, and the torque of torque nut housing increases, and increases to when can cut positioning pin, i.e. nut overcoat band
When the resistance of dynamic nut inner sleeve increases to cutting positioning pin, positioning pin is cut.Need to install anchor pole spiral shell after positioning pin cutting
When female, inner sleeve head is reversed clockwise with spanner, the cross section of the nut overcoat is hexagon, inner sleeve head circumscribed circle
Diameter be less than the nut overcoat inscribe diameter of a circle, continue torque nut housing clockwise, nut overcoat can not at this time
The torsion of nut inner sleeve, the screw thread relative torsion of nut inner sleeve and nut overcoat cooperation are driven, nut overcoat is higher by nut inner sleeve, spiral shell
Torque nut housing clockwise is continued to anchor disk in female housing top, further increases pretightning force, and nut inner sleeve is connect with nut overcoat
Screw thread be fine thread, the small then pretightning force of screw pitch is big, and not needing too large torque can reach the pretightning force of design.
Nut inner sleeve position identical with the nut overcoat offers a positioning hole, the positioning hole setting
One positioning pin 5, easy for installation, entire fastening nut process, including fastening nut inner sleeve, cut outside positioning pin and fastening nut
Set does not need the torque wrench that pauses and replace halfway, it is only necessary to which entire fastener cycle can be completed in torsion housing clockwise.It is not required to
Large torque to be the pretightning force that can reach design very much, reduce the labor intensity of worker；It improves pretightning force and prevents country rock in time
Convergent deformation, improve country rock resistance to compression, shearing strength, improve the force-bearing situation of country rock；Avoid secondary supporting or multiple supporting
Etc. wasting phenomenons.
The screw pitch of the strong full-thread bolt body of rod screw thread such as described is 10~12 millimeters, under same torque, big pitch nut peace
Fill that prestressing force is low, and rockbolt installation prestressing force is small, still belongs to passive protecting, not can control country rock early stage absciss layer, surrounding rock supporting intensity and
Globality is substantially reduced, and moderate finite deformation occurs and support system is caused to destroy；The nut inner sleeve external screw thread is fine thread, this is thin
The screw pitch of pitch thread is 2 millimeters, utilizes the fine pitch spiral shell between the nut inner sleeve and housing of the strong full-thread bolt such as high pre-stress
Line can effectively improve pretightning force, improve the globality of surrounding rock supporting intensity and country rock.
Claims (5)
1. anchor nut, it is characterised in that: the anchor nut includes nut inner sleeve and nut overcoat, and the nut overcoat is socketed in
The nut outside of inner cover, the inner surface of the nut inner sleeve be provided with etc. in the nut that matches of the strong full-thread bolt body of rod
Internal screw thread is covered, the outer surface of the nut inner sleeve is provided with nut inner sleeve external screw thread, and the inner surface of the nut overcoat is provided with
Nut overcoat internal screw thread, the nut overcoat internal screw thread are matched with the nut inner sleeve external screw thread；The outer spiral shell of the nut inner sleeve
The screw pitch of line is less than the screw pitch of the strong full-thread bolt body of rod screw thread such as described.
2. high pre-stress equal strength anchor rod nut according to claim 1, it is characterised in that: the lower end of the nut inner sleeve is set
It is equipped with the inner sleeve head that cross section is hexagon, external diameter of a circle where the hexagon is greater than the internal diameter of the nut overcoat；
The cross section of the nut overcoat is hexagon, and the external diameter of a circle in inner sleeve head is less than the nut overcoat inscribed circle
Diameter.
3. high pre-stress equal strength anchor rod nut according to claim 1, it is characterised in that: the strong full-thread bolt bar such as described
The screw pitch of body screw thread is 10~12 millimeters；The nut inner sleeve external screw thread is fine thread, and the screw pitch of the fine thread is 2 millis
Rice.
4. high pre-stress equal strength anchor rod nut according to claim 1, it is characterised in that: the nut inner sleeve and the spiral shell
The identical position of female housing offers a positioning hole, and a positioning pin is arranged in the positioning hole.
5. high pre-stress equal strength anchor rod nut according to claim 1, it is characterised in that: the length of the nut inner sleeve is big
In 3~5 millimeters of length of the nut overcoat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711120594.XA CN109751068A (en) | 2017-11-04 | 2017-11-04 | High pre-stress equal strength anchor rod nut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711120594.XA CN109751068A (en) | 2017-11-04 | 2017-11-04 | High pre-stress equal strength anchor rod nut |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109751068A true CN109751068A (en) | 2019-05-14 |
Family
ID=66401790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711120594.XA Pending CN109751068A (en) | 2017-11-04 | 2017-11-04 | High pre-stress equal strength anchor rod nut |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109751068A (en) |
-
2017
- 2017-11-04 CN CN201711120594.XA patent/CN109751068A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190514 |
|
| WD01 | Invention patent application deemed withdrawn after publication |