CN109707425A - The frictional pressure-relieving achor bar of the hollow slip casting of prestressing force and method for protecting support - Google Patents
The frictional pressure-relieving achor bar of the hollow slip casting of prestressing force and method for protecting support Download PDFInfo
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- CN109707425A CN109707425A CN201910184173.6A CN201910184173A CN109707425A CN 109707425 A CN109707425 A CN 109707425A CN 201910184173 A CN201910184173 A CN 201910184173A CN 109707425 A CN109707425 A CN 109707425A
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- sleeve pipe
- pressing sleeve
- block
- prestressing force
- slip casting
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- 238000000034 method Methods 0.000 title claims abstract description 25
- QLMNCUHSDAGQGT-UHFFFAOYSA-N sintofen Chemical compound N1=C(C(O)=O)C(=O)C=2C(OCCOC)=CC=CC=2N1C1=CC=C(Cl)C=C1 QLMNCUHSDAGQGT-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 238000007569 slipcasting Methods 0.000 title claims abstract description 18
- 238000003825 pressing Methods 0.000 claims abstract description 48
- 239000011435 rock Substances 0.000 claims abstract description 34
- 238000004873 anchoring Methods 0.000 claims abstract description 8
- 230000008093 supporting effect Effects 0.000 claims description 54
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 7
- 230000008092 positive effect Effects 0.000 abstract description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a kind of frictional pressure-relieving achor bar of the hollow slip casting of prestressing force and method for protecting support, pressure-relieving achor bar includes anchoring head part and anchor bar body, be arranged on anchor bar body plug, allow pressing sleeve pipe, get into block and hex-head nut, backing plate and spherical nut are arranged with allowing on pressing sleeve pipe, it is allowing pressing sleeve pipe front end that plug is set, the setting of pressing sleeve pipe rear end is being allowed to get into block and hex-head nut.Compared with prior art, the positive effect of the present invention is: the anchor pole is applied widely, both can be useful in harder rock stratum when prestressed anchor, and be more suitable for the high-ground stress environment of geological condition complexity；In high-ground stress environment, which makes surrouding rock deformation control in controlled range, is not in the unexpected avalanche of country rock；The anchor pole has structure simple, feature easy for construction, is able to achieve the newest support theory of " rigid-soft-rigid ".
Description
Technical field
The present invention relates to a kind of frictional pressure-relieving achor bar of the hollow slip casting of prestressing force and method for protecting support.
Background technique
With the high speed development of China's transport development cause, more and more newly built tunnels need to pass through complicated geological, by
In the unfavorable geologies bring construction and excavation supporting problem such as high-ground stress, weak surrounding rock, tunnel construction bottleneck is increasingly becomed.It is former
The anchoring and support idea that come " immediate support, strong supporting " not can be effectively controlled the deformation of country rock under complex geological condition.New
Studies have shown that the energy sufficiently in release stratum, while releasing energy, side supporting provides rigid protection when stratum does not deform, highland
Elastic supporting is provided when stress, stress release is complete to provide the theory of rigid protection, i.e. the limit resistance of " rigid-soft-rigid " type is released can type
Support form, can good deformation controlling for rock surrounding gateways.
Summary of the invention
The shortcomings that in order to overcome the prior art, the present invention provides a kind of frictional pressure-relieving achor bar of the hollow slip casting of prestressing force and
Method for protecting support, can realize well " rigid-soft-just " type support form, and have structure simple, it is easy for construction, it is large deformation
Tunnel construction under geological conditions provides effective solution.
The technical scheme adopted by the invention is that: a kind of frictional pressure-relieving achor bar of hollow slip casting of prestressing force, including anchorage head
Component and anchor bar body, be arranged on anchor bar body plug, allow pressing sleeve pipe, get into block and hex-head nut, covered allowing on pressing sleeve pipe
It equipped with backing plate and spherical nut, is allowing pressing sleeve pipe front end that plug is set, the setting of pressing sleeve pipe rear end is being allowed to get into block and turret head spiral shell
It is female.
The present invention also provides a kind of method for protecting support of the frictional pressure-relieving achor bar of the hollow slip casting of prestressing force, including following interior
Hold:
One, first " rigid " property supporting stage:
After the head of entire anchor pole insertion bolthole bottom, under anchor bar body promotion, anchorage head spreading is adjacent to hole wall, rotates hexagonal
Head nut, anchoring mouth and hole wall wedging, while pushing that get into block mobile to bottom hole direction allow pressing sleeve pipe orifice when getting into block arrival
When inclined-plane, block is got into while mobile be obstructed to one supporting power of pressing sleeve pipe is allowed, supporting power will by spherical nut and backing plate
Power passes to country rock, plays prestressing force supporting；
Two, second " soft " property supporting stage:
When stress deformation occurs for rock stratum around backing plate, stress F acts on backing plate, by spherical nut and allows pressing sleeve pipe is past to answer
Forced direction pushes；The support that block relies on rear end hex-head nut is got into, relative displacement does not occur with anchor bar body；Allow pressing sleeve pipe
Block will be got under stress F effect squeezing into and allow in pressing sleeve pipe, the relative friction forces F ' for getting into block and allowing between pressing sleeve pipe passes through ball
Shape nut and backing plate are converted into the supporting power F ' to rock stratum；When get into block got into completely allow in pressing sleeve pipe after, frictional force is by quiet
Friction is converted into sliding friction, gets into block frictional force in sliding extrusion inlet procedure and is stepped up, country rock stops becoming as F '=F
Shape, the process are the process of country rock release stress, yield supporting；
Three, third " rigid " property supporting stage:
It allows the bottom of pressing sleeve pipe when getting into block and sliding into and when plug contacts, gets into block and stop sliding, the branch of entire anchor pole
Shield power leans on the rigidity of entire anchor pole to play support action to country rock completely.
Compared with prior art, the positive effect of the present invention is:
(1) the anchor pole is applied widely, both can be useful in harder rock stratum when prestressed anchor, and be more suitable for geological condition
Complicated high-ground stress environment；
(2) is in high-ground stress environment, the anchor pole energy slow release crustal stress, controls surrouding rock deformation in controlled range,
It is not in the unexpected avalanche of country rock；
(3) the anchor pole has structure simple, feature easy for construction, is able to achieve the newest support theory of " rigid-soft-rigid ".
Detailed description of the invention
Examples of the present invention will be described by way of reference to the accompanying drawings, in which:
Fig. 1 is scheme of erection of the invention；
Fig. 2 is product explosive view of the invention；
Fig. 3 is anchorage head modular construction of the invention；
Fig. 4 is backing structure of the invention (left side is top view, the right side is bottom view)；
Fig. 5 is stopper structure of the invention (left side is top view, the right side is bottom view)；
Fig. 6 is that cannula structure is pressed in of the invention allowing (left side is side view, the right side is sectional view)；
Fig. 7 is spherical nut structure of the invention (left side is left view, the right side is right view)；
Fig. 8 is that (upper left is top view to block structure of getting into of the invention, upper right is cross-sectional view, lower-left is main view, bottom right is
Perspective view))；
Fig. 9 is hex-head nut structure of the invention；
Figure 10 is first " rigid " property supporting phase principle figure of the invention；
Figure 11 is to get into block to allow the enlarged drawing at pressure pipe inner hole heavy platform；
Figure 12 is the supporting stress and displacement relation figure in first " rigid " property supporting stage；
Figure 13 is second " soft " property supporting phase principle figure of the invention；
Figure 14 is getting into block at step and squeezing into and allow the supporting power of pressure pipe for second " soft " property supporting stage；
Figure 15 is the supporting stress and displacement curve figure in second " soft " property supporting stage；
Figure 16 is third of the invention " rigid " property supporting phase principle figure；
Figure 17 is the supporting stress and displacement curve figure in third of the invention " rigid " property supporting stage.
Specific embodiment
A kind of frictional pressure-relieving achor bar of hollow slip casting of prestressing force, as shown in Figure 2, comprising: anchorage head component 1, anchor bar body 2,
Backing plate 3, plug 4, allow pressing sleeve pipe 5, spherical nut 6, get into block 7, hex-head nut 8 etc., in which:
The structure of the anchoring head part 1 is as shown in Figure 3, comprising: intermediate plate and interior wedge.The interior wedge is the bone of anchor rod system
Frame, the top closure of interior wedge effectively can stop sandstone to enter, and slurry outlet is big, and slip casting is high-efficient；There are two tensioner guiding is oblique for tool
Face is provided with T-type sliding slot in guide ramp, and intermediate plate falls off when anchor bar body can be prevented to be put into bolthole.T is provided on the intermediate plate
Type structure, can be put into the T-type groove of interior wedge (rise shell), and the outside of intermediate plate is provided with helical teeth, and helical teeth Ke Hom enters anchor hole rock when preload
Soil plays anchorage effect.The wedging inclined-plane of helical teeth is identical as the angle of tensioner guide ramp, guarantees intermediate plate tensioning process translation
It opens, big with rock wall interface, anchor force is big.
The anchor bar body 2 is the hollow bolt body with corrugated thread structure, is the connecting piece of entire anchor rod system, described
Anchor bar body 2 is connect by the interior corrugated thread on interior wedge with interior wedge, and the rotation process of anchor bar body 2 can push intermediate plate to carry out translation
It opens.
The structure of the backing plate 3 is as shown in figure 4, backing plate 3 is set in and allows the rear end of pressing sleeve pipe 5, the rear end of backing plate 3 and spherical
The preceding end in contact of nut 6.
The structure of the plug 4 as shown in figure 5, be arranged in allows the front end of pressing sleeve pipe 5.
The structure for allowing pressing sleeve pipe 5 passes through external screw thread and 6 screw thread of spherical nut as shown in fig. 6, rear end is formed with external screw thread
Connection；It allows 5 front end of pressing sleeve pipe to be formed with internal screw thread, is threadedly coupled by internal screw thread with plug 4；Pressing sleeve pipe 5 is allowed to be hollow tubulose
Structure, inner hole middle part are with the tapered conical surface (front inner diameter n2 < back end inside diameter n1), are the main compressive strain area that allows；It is allowing
Block 7 is got into the setting of 5 rear end of pressing sleeve pipe, gets into block from when allowing 5 rear end of pressing sleeve pipe to get into allow in pressing sleeve pipe 5, radial deformation is big
In axial deformation, so that generating frictional force realizes that the side of anchor pole allows flanging supporting, due to front inner diameter n2 < back end inside diameter n1,
It allows during pressure, frictional force gradually increases, and the final balance for realizing supporting power and crustal stress reaches supporting and stablizes.
The structure of the spherical nut 6 as shown in fig. 7, be set in allows the rear end of pressing sleeve pipe 5.
The structure for getting into block 7 gets into the rear end setting hexagonal of block 7 as shown in figure 8, setting is allowing 5 rear end of pressing sleeve pipe
Head nut 8.
As shown in figure 9, inner hole has the screw thread matched with hollow bolt body 2, setting exists the structure of the hex-head nut 8
Get into the rear end of block 7.
The present invention is allowing the difference of different location generates in pressing sleeve pipe frictional force by getting into block, generates to country rock different
Supporting power, whole process not only releases surrouding rock stress, but also plays supporting effect, allow country rock generate slowly deformation, deformation
Amount is in controlled area charactert.Specific Bracing Process is as follows:
1, first " rigid " property supporting stage:
As shown in Figure 10 and Figure 11, after the head of anchor pole insertion bolthole bottom, under the promotion of hollow bolt body 2,1 spreading of anchorage head
It is adjacent to hole wall, rotation hex-head nut 8, anchoring mouth and hole wall wedging, while pushing and getting into block 7 to the movement of bottom hole direction, when crowded
It when allowing pressing sleeve 5 inward hole slope of pipe into the arrival of block 7, gets into the movement of block 7 and is obstructed, while getting into block to allowing 5 one supporting power of pressing sleeve pipe,
Supporting power transmits the force to country rock by spherical nut 6 and backing plate 3, plays prestressing force supporting, changes with grouting behind shaft or drift lining to country rock
It is good.The supporting stress and displacement relation in first " rigid " property supporting stage are as shown in figure 12.
2, second " soft " property supporting stage:
As shown in Figure 13 and Figure 14, when stress deformation occurs for 3 surrounding rock stratum of backing plate, stress F acts on backing plate, will be spherical
Nut 6 and allow pressing sleeve pipe 5 toward stress direction push；And block 7 is got into because supporting by rear hex-head nut 8, it gets into
Relative displacement does not occur for relative position of the block on anchor pole；It allows pressing sleeve pipe 5 to get into block under stress F effect, gets at this time
Block, which is extruded into, allows pressure pipe, and the relative friction forces F ' for getting into block and allowing between pressure pipe is converted by spherical nut, backing plate to rock
The supporting power F ' of layer.In the process getting into block and getting into completely, due to continuing to increase for contact area, the supporting power F ' for the generation that rubs
Increase comparatively fast, gets into rear frictional force completely by static friction and be converted into sliding friction, have the decline process an of very little, in sliding
Process, due to the wimble structure allowed on pressure pipe inner hole structure, so getting into block frictional force in sliding extrusion inlet procedure can be stepped up,
As F '=F country rock stop deformation, the process be exactly country rock release stress, the process of yield supporting, the supporting power of the process with
Displacement curve is substantially as shown in figure 15.
3, third " rigid " property supporting stage:
As shown in figure 16, the bottom (i.e. front end) of pressure pipe is allowed to squeeze that is, when getting into block contact plug when getting into block and slide into
Sliding into block is limited, gets into block and no longer slides, and the supporting power of entire anchor pole leans on anchor rod system rigidity to play supporting to country rock completely
Effect is third " rigid " property supporting stage.The supporting stress and displacement relation in the stage are as shown in figure 17.
Claims (9)
1. a kind of frictional pressure-relieving achor bar of hollow slip casting of prestressing force, it is characterised in that: including anchoring head part and anchor bar body, in anchor
Be arranged on the body of rod plug, allow pressing sleeve pipe, get into block and hex-head nut, be arranged with backing plate and spherical spiral shell allowing on pressing sleeve pipe
Mother is allowing pressing sleeve pipe front end that plug is arranged, and the setting of pressing sleeve pipe rear end is being allowed to get into block and hex-head nut.
2. the frictional pressure-relieving achor bar of the hollow slip casting of prestressing force according to claim 1, it is characterised in that: the pressing sleeve pipe that allows
Front end is formed with internal screw thread, is threadedly coupled by internal screw thread with plug；It is described that pressing sleeve pipe rear end is allowed to be formed with external screw thread, pass through external screw thread
It is threadedly coupled with spherical nut.
3. the frictional pressure-relieving achor bar of the hollow slip casting of prestressing force according to claim 1, it is characterised in that: the pressing sleeve pipe that allows
For hollow tubular structure, inner hole middle part is, with the tapered conical surface, inner hole front inner diameter is less than back end inside diameter.
4. the frictional pressure-relieving achor bar of the hollow slip casting of prestressing force according to claim 3, it is characterised in that: allowing in pressing sleeve pipe
Heavy platform is arranged in hole rear end.
5. the frictional pressure-relieving achor bar of the hollow slip casting of prestressing force according to claim 1, it is characterised in that: the turret head spiral shell
Female inner hole is provided with the screw thread with anchor pole mates.
6. the frictional pressure-relieving achor bar of the hollow slip casting of prestressing force according to claim 1, it is characterised in that: the anchoring head
Part includes interior wedge and the intermediate plate that is arranged on interior wedge, tensioner guide ramp and interior corrugated thread is arranged on the interior wedge, in institute
It states and is provided with T-type sliding slot in tensioner guide ramp；Be provided on the intermediate plate helical teeth and with the T-type that is opened up in tensioner guide ramp
The T-type structure that sliding slot matches.
7. the frictional pressure-relieving achor bar of the hollow slip casting of prestressing force according to claim 6, it is characterised in that: the anchor bar body is logical
The interior corrugated thread crossed on interior wedge is connect with interior wedge.
8. the frictional pressure-relieving achor bar of the hollow slip casting of prestressing force according to claim 1, it is characterised in that: the anchor bar body is
Hollow bolt body.
9. a kind of method for protecting support using the frictional pressure-relieving achor bar of the hollow slip casting of prestressing force described in claim 1, feature exist
In: including following content:
One, first " rigid " property supporting stage:
After the head of entire anchor pole insertion bolthole bottom, under anchor bar body promotion, anchorage head spreading is adjacent to hole wall, rotates turret head spiral shell
Mother, anchoring mouth and hole wall wedging, while pushing that get into block mobile to bottom hole direction allow pressing sleeve pipe orifice inclined-plane when getting into block arrival
When, block is got into while mobile be obstructed to one supporting power of pressing sleeve pipe is allowed, and supporting power is passed power by spherical nut and backing plate
Country rock is passed, prestressing force supporting is played, country rock is improved with grouting behind shaft or drift lining；
Two, second " soft " property supporting stage:
When stress deformation occurs for rock stratum around backing plate, stress F acts on backing plate, by spherical nut and allows pressing sleeve pipe is past to answer masterpiece
It is pushed with direction；The support that block relies on rear end hex-head nut is got into, relative displacement does not occur with anchor bar body；Allow pressing sleeve Guan Ying
Block will be got under power F effect squeezing into and allow in pressing sleeve pipe, the relative friction forces F ' for getting into block and allowing between pressing sleeve pipe passes through spherical spiral shell
Female and backing plate is converted into the supporting power F ' to rock stratum；When get into block got into completely allow in pressing sleeve pipe after, frictional force is by static friction
It is converted into sliding friction, block frictional force in sliding extrusion inlet procedure is got into and is stepped up, country rock stops deformation as F '=F, should
Process is the process of country rock release stress, yield supporting；
Three, third " rigid " property supporting stage:
It allows the bottom of pressing sleeve pipe when getting into block and sliding into and when plug contacts, gets into block and stop sliding, the supporting power of entire anchor pole
Support action is played to country rock by the rigidity of entire anchor pole completely.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910184173.6A CN109707425A (en) | 2019-03-12 | 2019-03-12 | The frictional pressure-relieving achor bar of the hollow slip casting of prestressing force and method for protecting support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910184173.6A CN109707425A (en) | 2019-03-12 | 2019-03-12 | The frictional pressure-relieving achor bar of the hollow slip casting of prestressing force and method for protecting support |
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| Publication Number | Publication Date |
|---|---|
| CN109707425A true CN109707425A (en) | 2019-05-03 |
Family
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|---|---|---|---|
| CN201910184173.6A Pending CN109707425A (en) | 2019-03-12 | 2019-03-12 | The frictional pressure-relieving achor bar of the hollow slip casting of prestressing force and method for protecting support |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111255494A (en) * | 2020-02-25 | 2020-06-09 | 中铁隆昌铁路器材有限公司 | Lengthened anti-drop prestressed hollow grouting anchor rod and supporting method thereof |
| CN111456781A (en) * | 2020-04-07 | 2020-07-28 | 杭州图强工程材料有限公司 | Hollow anchor rod with orifice capable of releasing energy and yielding pressure and construction method thereof |
| CN111456782A (en) * | 2020-04-07 | 2020-07-28 | 杭州图强工程材料有限公司 | Grouting bonding prestress yielding anchor rod and construction method thereof |
| CN112032163A (en) * | 2020-08-10 | 2020-12-04 | 洛阳双瑞特种装备有限公司 | Height adjusting device with adjustable anchoring thickness and height adjusting method |
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- 2019-03-12 CN CN201910184173.6A patent/CN109707425A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111255494A (en) * | 2020-02-25 | 2020-06-09 | 中铁隆昌铁路器材有限公司 | Lengthened anti-drop prestressed hollow grouting anchor rod and supporting method thereof |
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| CN111456782A (en) * | 2020-04-07 | 2020-07-28 | 杭州图强工程材料有限公司 | Grouting bonding prestress yielding anchor rod and construction method thereof |
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