CN107761788B - A kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test - Google Patents
A kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test Download PDFInfo
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- CN107761788B CN107761788B CN201711070539.4A CN201711070539A CN107761788B CN 107761788 B CN107761788 B CN 107761788B CN 201711070539 A CN201711070539 A CN 201711070539A CN 107761788 B CN107761788 B CN 107761788B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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Abstract
The experimental provision that the invention discloses a kind of suitable for anchoring cyclic tension, dynamic load extension test is mainly made of two pressure-bearing units up and down；The upper pressure-bearing unit includes sequentially connected top bearing disc, the first vertical thick stick, the loaded substrate in bottom from top to down；There are two the first vertical thick stick settings, and symmetrical；The lower pressure-bearing unit includes being connected with bottom bearing disc, the second vertical thick stick, the loaded substrate in top in turn from below to up；There are two the second vertical thick stick settings, and symmetrical.By the experimental provision, the anchor system that steel pipe and anchor pole form can be placed in inside, so that the compressive load loaded between top bearing disc and bottom bearing disc is converted to tensile load；The anchor system extension test under cyclic loading or dynamic load load can be achieved.Its economic cost is low, technical effect is obvious, testing precision is high, can provide corresponding solution for fatigue properties research of the Bolt System under circulation (dynamic load) load.
Description
Technical field
The experimental provision that the present invention relates to a kind of suitable for anchoring cyclic tension, dynamic load extension test, belongs to mechanical analysis
And the field of test technology.
Background technique
Bolt System has a wide range of applications in fields such as ground, side slope, coal mine support, hydraulic engineerings.In anchor pole
In terms of supporting quality and anchor pole performance evaluation, there are all kinds of technical regulation and detection scheme, such as anchor pole static(al) pull-out test,
Anchoring quality non-destructive testing scheme, cut resistance test, engineering site pull-out test etc..
Wherein carry out in laboratory it is more to anchor pull-out test, it is such to test multi-purpose concrete or steel pipe simulation
Engineering rock mass.When used medium is concrete, anchor pole is screwed in concrete test block under drilling machine drive or insertion is pre-
In the drilling being first arranged, gap then between the two is filled up by Anchor Agent, and anchor rod body and the cementing formation anchoring that drills are surveyed
Test system.When used medium is steel pipe, anchor pole screws in steel pipe under drilling machine drive, and the two is then pre- by steel duct
The cementing formation anchor system of the Anchor Agent set, or the two is bonded as integral fastening system using post-grouting means.
In the above-mentioned indoor anchor system testing scheme referred to, the anchor system of prepared forming finally needs to carry out brokenly
The test of bad property.In traditional testing scheme, if the medium used is concrete, destructive pull-out test can be used
Anchor rod drawing tester, can also be using large-scale drawing (shearing) equipment；If using steel pipe, relevant destructiveness
Electro-hydraulic servo testing machine can be used in pull-out test.For the latter, anchor pole-steel pipe anchor system is clamped on testing machine, clamping
End is respectively anchor pole end and steel pipe end.And the clamping at steel pipe end mostly uses specified scheme to remove and answer the clamping of internal anchor pole
Power avoids the situation of the nearly single drawing of anchor pole.It is final by setting specific loading velocity and destructive test threshold value, anchor pole
It is extracted from steel pipe, ultimate analysis failure mode, is fitted drawing force-displacement curve, obtains the specific mechanical property of anchor system.
This testing scheme can be used to optimize the Anchorage Plan of particular form, or improve the mechanical property of anchor pole (anchoring material).
At home and abroad research institution is all widely used steel pipe-anchor pole combining form anchoring test macro, such as moral
Research institute, Essen, state, the CIRSO research institute of Australia, Chinese China Coal Research Institute were all once examined using this scheme
The performance of assessment valence Bolt System.However it is limited by the limitation of experimental facilities, this scheme is only used for static(al) drawing survey
Examination, then seems unable to do what one wishes to circulation (dynamic load) load pull-out test.In ground field, the correlative study of (dynamic load) load is recycled
It is relatively conventional, but the research work usually carried out is both for rock sample under rock mass, such as uniaxial cycling (dynamic load) load
Hysteresis ring property, memory characteristic, rheological behavior etc., such as Hopkinson bar impact test.But this class testing is confined to more
Uniaxial (three axis) compression verification is seldom related to stretching loop test.For support unit, relevant circulation (dynamic load) is carried
Lotus test is just less.
For steel pipe-Bolt System mentioned above, carry out circulation (dynamic load) tensile load in laboratory
It is very big to test faced technical problem.Main cause is: the Based on Electro-hydraulic Loading Servo System of existing list (three) shaft experiment machine is more
It is designed for stretching or compression verification, in being applied with, it can be achieved that different frequency, amplitude, endless form for circulation (dynamic load) load
Compression recycle (dynamic load) load test.However then there is certain bottleneck in terms of stretching, although carrying out single extension test
Technology relative maturity, but high frequency circulation (dynamic load) extension test is but unable to reach and high frequency circulation (dynamic load) compression is surveyed
The same technical level of examination, mostly by the technical restriction of one or more aspects.
In ground field, recycle the existing all kinds of engineering sites of (dynamic load) disturbance frequency, for example, in subway (railway) train it is reciprocal
Operation, the frequent disturbance of big gun pick in coal mine roadway, the driving of neighbouring working face disturbs etc. in engineering excavation.Although to rock
The circulation dynamic loading mechanical characteristic of (soil) has carried out many test analysis work, but (especially for support unit
Anchor pole) research done of the mechanical characteristic analysis in the case where recycling dynamic loading not enough, relevant research test analysis work has very much
It is necessary.
Summary of the invention
To solve the deficiencies in the prior art, the purpose of the present invention is to provide one kind to be suitable for anchoring cyclic tension, dynamic load
The experimental provision of extension test can be surveyed for steel pipe-anchor rod anchored system circulation in laboratory or dynamic load tensile load
Examination provides certain resolving ideas.
In order to achieve the above objectives, the present invention adopts the following technical scheme that:
A kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test, characterized in that including upper pressure-bearing unit
With lower pressure-bearing unit；The upper pressure-bearing unit includes that sequentially connected top bearing disc, the first vertical thick stick, bottom are loaded from top to down
Substrate；There are two the first vertical thick stick settings, and symmetrical；The first vertical thick stick for connect top bearing disc and bottom by
Carry substrate；The upper pressure-bearing unit is centrosymmetric, and symmetry axis is the company of top pressure-bearing disk center and the loaded base center in bottom
Line；The lower pressure-bearing unit includes sequentially connected bottom bearing disc, the second vertical thick stick, the loaded substrate in top from below to up；It is described
There are two second vertical thick stick settings, and symmetrical；The second vertical thick stick is for connecting the loaded substrate of bottom bearing disc and top；Institute
It states lower pressure-bearing unit to be centrosymmetric, symmetry axis is the line of bottom pressure-bearing disk center and the loaded base center in top；The top
The loaded substrate in portion is located between two the first vertical thick sticks；The loaded substrate in bottom is located between two the second vertical thick sticks；The top
Loaded substrate is provided centrally with steel pipe end bayonet；The loaded substrate in bottom is provided centrally with anchor pole end bayonet；The anchor
The lower end of rod end bayonet is set as courage jacking mouth shape；Eye split is vertically arranged on the first vertical thick stick and the second vertical thick stick.
A kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test above-mentioned, characterized in that the anchor pole
It holds and is matched with eccentric ball seat at the courage jacking mouth shape of bayonet；The bias ball seat uses hollow hemispherical.
A kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test above-mentioned, characterized in that the bias
Ball seat bottom is provided with symmetrical two fastener holes.
A kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test above-mentioned, characterized in that described first
It is the column of camber line that vertical thick stick and the second vertical thick stick, which use section,.
A kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test above-mentioned, characterized in that the camber line
Corresponding central angle is 70-80 degree.
A kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test above-mentioned, characterized in that the top
The bottom centre of bearing disc and the top center of bottom bearing disc are provided with circular trough.
A kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test above-mentioned, characterized in that the observation
It seams and is set to rectangular aperture, two short sides are set as semicircle.
A kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test above-mentioned, characterized in that the steel pipe
Bayonet is held to be furnished with T-nut；The internal diameter of the nut matches with diameter of steel tube.
A kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test above-mentioned, characterized in that the top
The bottom of bearing disc and the top perimeter of bottom bearing disc are provided with groove；The groove is respectively used to the first vertical thick stick of corresponding placement
With the second vertical thick stick.
A kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test above-mentioned, characterized in that the top
The top center of bearing disc is provided with top pressure-bearing dish groove.
Advantageous effects of the invention:
1) compressive load for recycling (dynamic load) load compression test can be switched to be embodied in the drawing on anchor rod system completely
Load is stretched, and this conversion regime can't lose the special parameter setting of original compression circulation (dynamic load) load；
2) to original testing machine without negative effect, as long as circulation (dynamic load) performance that former testing machine has, can turn
Changing same compressive load parameter characteristic is tensile load parameter characteristic, while the experimental provision can also carry out static(al) and stretch examination
It tests；
3) traditional method of clamping is avoided to the fixed form at steel pipe end, is avoided and is gone out inside retaining part anchor system
Existing nip stress is released to potential restriction effect present in anchor pole stretching displacement；
4) by the adjustment effect of eccentric ball seat, eccentric axis institute that may be present band in drawing process has also effectively been avoided
The deviatoric stress situation come；
5) by the eye split of the first vertical thick stick and the second vertical thick stick side vertical setting, anchor pole-steel pipe anchor can be observed in real time
Gu the destruction situation and details of system during the drawing process, guidance amendment test result；
6) economic cost is low, technical effect is obvious, modularity degree is high, testing precision is high, can be Bolt System
The research of mechanics fatigue properties and failure analysis under circulation (dynamic load) load provide corresponding solution.
Detailed description of the invention
Fig. 1 is the schematic perspective view of this experimental provision；
Fig. 2 is the side view of Fig. 1；
Fig. 3 is the side view of another angle of Fig. 1；
Fig. 4 is the cross section structure schematic diagram of Fig. 2；
Fig. 5 is the cross section structure schematic diagram of Fig. 3.
The meaning of appended drawing reference in figure:
Bearing disc at the top of 1-, the bottom 2- bearing disc, 3- first found thick stick, and 4- second stands thick stick, the loaded substrate in the bottom 5-, the top 6-
Loaded substrate, 7- anchor pole end bayonet, 8- steel pipe end bayonet, the top 9- pressure-bearing dish groove, 10,11- eye split, 12,14- circular trough,
13,15- groove, 16- bias ball seat, 17- fastener hole.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
This experimental provision is in structure, as shown in Figure 1, including upper pressure-bearing unit and lower pressure-bearing unit.
Upper pressure-bearing unit includes sequentially connected top bearing disc 1, the first vertical thick stick 3, the loaded substrate 5 in bottom from top to down.
There are two the first vertical settings of thick stick 3, and symmetrical.First vertical thick stick 3 is for connecting top bearing disc 1 and the loaded substrate 5 in bottom.On
Pressure-bearing unit is centrosymmetric, and symmetry axis is the line at 1 center of top bearing disc and loaded 5 center of substrate in bottom.
Lower pressure-bearing unit includes sequentially connected bottom bearing disc 2, the second vertical thick stick 4, the loaded substrate 6 in top from below to up.
There are two the second vertical settings of thick stick 4, and symmetrical.Second vertical thick stick 4 is for connecting the loaded substrate 6 of bottom bearing disc 2 and top.Under
Pressure-bearing unit is centrosymmetric, and symmetry axis is the line at 2 center of bottom bearing disc and loaded 6 center of substrate in top.
Two pressure-bearing units are to be mutually related in structure: the loaded substrate 6 in top is located between two the first vertical thick sticks 3.
The loaded substrate 5 in bottom is located between two the second vertical thick sticks 4.
The loaded substrate 6 in top is provided centrally with steel pipe end bayonet 8.The loaded substrate 5 in bottom is provided centrally with anchor pole end
Bayonet 7.The lower end of anchor pole end bayonet 7 is set as courage jacking mouth shape.
In the present embodiment, in upper pressure-bearing unit, wherein the diameter of top bearing disc 1 is 180~220mm, with a thickness of
40mm.Bottom centre is provided with a circular trough 14, and diameter and depth are respectively 90mm and 20mm.Bottom periphery is provided with groove 15, ditch
Groove width and depth are respectively 25mm and 10mm.Top pressure-bearing dish groove 9 is provided at the top of top bearing disc 1, width is 45~55mm,
Depth is 4mm.The height of first vertical thick stick 3 is 220~270mm, and with a thickness of 25mm, corresponding central angle is 76 °.The loaded base in bottom
Bottom 5 with a thickness of 40mm, center is machined with the anchor pole end bayonet 7 that an internal diameter is 25mm, does around bayonet and increases within the scope of 40mm
Processing, height 10mm；It is courage jacking mouth shaped opening in the range of the 25mm of bayonet lower end, which can match eccentric ball seat 16.Partially
Bulbus cordis seat 16 is hollow hemispherical, and bore size is 17~23mm, and 16 base diameter of ball seat is 80mm；It opens eccentric 16 bottom of ball seat
There are symmetrical two fastener holes 17, diameter and depth are respectively 5mm and 3mm.Upper pressure-bearing unit eye split 10 is rectangular opening, short
Side semicircle aperture, distance of 10 lower end of eye split apart from the loaded substrate 5 in bottom are 10mm, and the longitudinal length of eye split 10 is
120mm, width 15mm.Fastener hole 17, will be inclined using the fastener hole 17 of eccentric 16 bottom of ball seat for cooperating two pawl spanners
Bulbus cordis seat 16 is fastened on anchor pole end.
In lower pressure-bearing unit, wherein the diameter of bottom bearing disc 2 is 180~220mm, with a thickness of 40mm, top center
It is provided with a circular trough 12, diameter and depth are respectively 90mm and 20mm；Top perimeter is provided with groove 13, groove width and depth
Respectively 25mm and 10mm.The height that lower pressure-bearing unit second founds thick stick 4 is 220~270mm, with a thickness of 25mm, the corresponding center of circle
Angle is 76 °.The loaded substrate 6 in top with a thickness of 40mm, center is through being provided with a steel pipe end bayonet 8, the bore dia on bayonet top
For 80mm, depth 5mm, the bore dia of lower part is 60mm, depth 35mm.Steel pipe end bayonet 8 is configured with T-nut, spiral shell
Mother can coincide with bayonet, and nut internal diameter is different according to diameter of steel tube and has different size.Eye split 11 is rectangular opening, short side
Semicircle aperture, distance of 11 upper end of eye split apart from the loaded substrate 6 in top are 10mm, and the longitudinal length of eye split 11 is
120mm, width 15mm.
It is individually processing in the pressure-bearing unit up and down of the experimental provision, passes through the ditch of top bearing disc 1 and bottom bearing disc 2
Slot 13 and 15 can realize the modularity of the device, realize hand assembled.
Between upper and lower pressure-bearing unit, there is the stretching of the body of rod in enough space compensation anchor system stretching travels, it can
Adapt to the anchor system extension test of stock size.
In order to expand compensation space, the bottom or bottom of bearing disc 1 at the top of Rockbolt element deformation excessive impact is avoided to hold
The top of platen 2, at top, the bottom of bearing disc 1 and the top of bottom bearing disc 2 machined the circular trough of certain depth respectively
14 and 12 to expand axial deformation space.
Fine thread is processed by the T-nut to match with 8 internal diameter of steel pipe end bayonet, and in outer wall of steel pipe, is passed through
The T-nut of different aperture internal diameters, can match the steel pipe of different-diameter.This steel pipe fixed form, eliminates traditional drawing
The chucking power of outer wall of steel pipe will not be limited so that internally compression will not be caused portion's Anchor Agent by stretching test machine grip holder in test
The stretching displacement of anchor pole processed.
By the eye split being arranged in upper pressure-bearing unit and lower pressure-bearing unit, anchor pole-steel pipe anchoring system can be observed in real time
Destruction situation and destruction details in the drawing process of system, guidance amendment test result.Pass through the eccentric ball seat of anchor pole end bayonet 7
The 16 adjustable coincidence errors for adapting to anchor pole axis and 8 axis of steel pipe end bayonet, so that removal may go out during the drawing process
Existing eccentric stress.
This experimental provision in operation, in accordance with the following steps:
1. before test, then fine thread on the steel tube end maching of the anchor system of preparation forming revolves on steel pipe
Upper T-nut, nut have different specifications, and outer diameter is unified for coincide with steel pipe end bayonet 8, and inner diameter size can be according to steel
Pipe diameter and specifically determine.
2. simultaneously in the anchor pole end of anchor system processing fine thread to be connected with eccentric ball seat 16.In anchor system
Anchor pole end screws on eccentric ball seat 16, which has different specifications, but its external dimensions can be with anchor pole end bayonet 7
The courage jacking mouth face of lower end coincide.Different specifications has different internal diameters, and then adapts to the anchor pole of different-diameter.Cooperate two pawls
Eccentric ball seat 16 is fastened on anchor pole end by spanner using the fastener hole 17 of eccentric 16 bottom of ball seat.
3. upper and lower load bearing unit is separated, steel pipe end is then fixed with T-nut, anchor pole end is fixed with eccentric sphere
The test cell of seat 16 is fixed between steel pipe end bayonet 8 and anchor pole end bayonet 7.
4. by the groove 13 and 15 around top bearing disc 1 and bottom bearing disc 2, by the vertical thick stick 3 and 4 of two bearing discs
Buckle is in the trench.In order to guarantee do not occur eccentric carrying during stretching, eccentric ball seat is adjusted by weight before testing
16 orientation guarantees that anchor pole end bayonet 7 and steel pipe end bayonet 8 are located on same axis.
5. the experimental system that above-mentioned assembling shapes is placed between the upper pressing disc of testing machine, then adjusted by testing machine
The distance of bearing disc 1 and bottom bearing disc 2, makes it contact with each other at the top of upper pressing disc and experimental system.Then according to experiment need
It wants, sets specific cyclic loading parameter or dynamic load load parameter, finally carry out experiment, uniaxial cycling (dynamic load) compression will turn
It is changed to uniaxial cycling (dynamic load) stretching.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test, characterized in that including upper pressure-bearing unit and
Lower pressure-bearing unit；
The upper pressure-bearing unit includes sequentially connected top bearing disc, the first vertical thick stick, the loaded substrate in bottom from top to down；It is described
There are two first vertical thick stick settings, and symmetrical；The first vertical thick stick is for connecting top bearing disc and the loaded substrate in bottom；Institute
It states pressure-bearing unit to be centrosymmetric, symmetry axis is the line of top pressure-bearing disk center and the loaded base center in bottom；
The lower pressure-bearing unit includes sequentially connected bottom bearing disc, the second vertical thick stick, the loaded substrate in top from below to up；It is described
There are two second vertical thick stick settings, and symmetrical；The second vertical thick stick is for connecting the loaded substrate of bottom bearing disc and top；Institute
It states lower pressure-bearing unit to be centrosymmetric, symmetry axis is the line of bottom pressure-bearing disk center and the loaded base center in top；
The loaded substrate in top is located between two the first vertical thick sticks；The loaded substrate in bottom be located at two the second vertical thick sticks it
Between；
The loaded substrate in top is provided centrally with steel pipe end bayonet；The loaded substrate in bottom is provided centrally with anchor pole end
Bayonet；The lower end of anchor pole end bayonet is set as courage jacking mouth shape；
Eye split is vertically arranged on the first vertical thick stick and the second vertical thick stick.
2. a kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test according to claim 1, feature
It is to be matched with eccentric ball seat at the courage jacking mouth shape of anchor pole end bayonet；The bias ball seat uses hollow hemispherical.
3. a kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test according to claim 2, feature
It is that the bias ball seat bottom is provided with symmetrical two fastener holes.
4. a kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test according to claim 1, feature
It is that the first vertical thick stick and the second vertical thick stick are the column of camber line using cross section.
5. a kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test according to claim 4, feature
It is that the corresponding central angle of the camber line is 70-80 degree.
6. a kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test according to claim 1, feature
It is that the bottom centre of the top bearing disc and the top center of bottom bearing disc are provided with circular trough.
7. a kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test according to claim 1, feature
It is that the eye split is set as rectangular aperture, two short sides are set as semicircle.
8. a kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test according to claim 1, feature
It is that steel pipe end bayonet is furnished with T-nut；The internal diameter of the nut matches with diameter of steel tube.
9. a kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test according to claim 1, feature
It is that the bottom of the top bearing disc and the top perimeter of bottom bearing disc are provided with groove；The groove is respectively used to correspond to
Place the first vertical thick stick and the second vertical thick stick.
10. a kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test according to claim 1, special
Sign is that the top center of the top bearing disc is provided with top pressure-bearing dish groove.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711070539.4A CN107761788B (en) | 2017-11-03 | 2017-11-03 | A kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test |
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|---|---|---|---|
| CN201711070539.4A CN107761788B (en) | 2017-11-03 | 2017-11-03 | A kind of experimental provision suitable for anchoring cyclic tension, dynamic load extension test |
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| CN107761788A CN107761788A (en) | 2018-03-06 |
| CN107761788B true CN107761788B (en) | 2019-04-19 |
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| CN110631909A (en) * | 2019-09-19 | 2019-12-31 | 河南理工大学 | Reverse anchor rock complex anchor rod working creep drawing characteristic test method |
| CN110455629A (en) * | 2019-09-19 | 2019-11-15 | 河南理工大学 | A kind of reversible type anchor pole work creep drawing characteristic test system |
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| CN203758829U (en) * | 2014-04-17 | 2014-08-06 | 葛洲坝集团第六工程有限公司 | Assembling platform for tensile test piece anchor head |
| CN105510158B (en) * | 2016-01-11 | 2018-04-03 | 河南理工大学 | Anchoring body dynamic tensile test device and experimental method |
| CN107084893B (en) * | 2017-06-14 | 2023-03-10 | 西安工业大学 | Joint rock mass anchor rod dynamic load test device |
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