CN111255494A - Lengthened anti-drop prestressed hollow grouting anchor rod and supporting method thereof - Google Patents
Lengthened anti-drop prestressed hollow grouting anchor rod and supporting method thereof Download PDFInfo
- Publication number
- CN111255494A CN111255494A CN202010117026.XA CN202010117026A CN111255494A CN 111255494 A CN111255494 A CN 111255494A CN 202010117026 A CN202010117026 A CN 202010117026A CN 111255494 A CN111255494 A CN 111255494A
- Authority
- CN
- China
- Prior art keywords
- anchor rod
- shell
- wedge
- anchor
- expansion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a lengthened anti-drop prestressed hollow grouting anchor rod and a supporting method thereof, wherein the hollow grouting anchor rod comprises an anchoring head and an anchor rod body, the anchoring head comprises an inner expanding shell wedge and two expanding shell clamping pieces symmetrically arranged on the inner expanding shell wedge, the head part of the inner expanding shell wedge is symmetrically provided with a wedge-shaped groove and a T-shaped groove, the expanding shell clamping pieces are provided with a wedge-shaped wing and a T-shaped wing which are respectively matched with the wedge-shaped groove and the T-shaped groove, and the tail end of the anchor rod body is sequentially provided with a grout stop plug, a backing plate, a spherical nut and a prestressing device. The invention can effectively prevent the expansion shell clamping piece from being pulled away from the anchor rod and falling off from the head of the wedge in the expansion shell when pretightening force is applied; the invention can overcome the problem that the ultralong anchor rod is not easy to center by additionally arranging one or more fixers for fixing the anchor rod body and the anchor hole position in the middle of the anchor rod body; the invention applies prestress by a mechanical device, and effectively overcomes the defect that the prestress is applied only by manpower in the prior art.
Description
Technical Field
The invention relates to a lengthened anti-drop prestressed hollow grouting anchor rod and a supporting method thereof.
Background
With the high-speed development of the traffic construction industry in China, more and more newly-built tunnels need to pass through complex geology, and the requirements of tunnel support on the prestressed anchor rods are increased. However, in the actual use process of the anchor rod, the following three problems exist:
(1) the shell expansion clamping piece of the anchoring head on the market does not have a limiting device in the expansion direction of the anchoring head, so that the shell expansion clamping piece can easily slide out of the T-shaped groove in a severe working environment. For example, the anchor rods stored in the anchor rod storage of the anchor rod trolley can slide out along the T-shaped groove due to large vibration of the trolley during working; or in IV-V grade soft rock, due to poor surrounding rock performance, when prestress is applied, the expansion shell clamping piece is squeezed into the soft rock, so that the expansion shell clamping piece is separated from the expansion shell inner wedge, at the moment, the anchoring head fails, the rejection rate of the anchor rod is increased, and the expansion shell clamping piece lost in the anchor hole cannot be recycled.
(2) Because the lengthened anchor rods are connected by two or three anchor rods through connecting sleeves, the total length can reach 9-15 meters. In the use process, only the anchoring head and the grout stopper are used for fixing the anchor rod in the radial direction of the anchor hole. The grout stop plug is made of rubber, is relatively soft and has poor centering effect on the anchor rod; meanwhile, the outer diameter of the anchor rod body is smaller than the diameter of the anchor hole, the length of the anchor rod body is long, the deflection is large, and the connection between the middle section of the anchor rod body and the anchor hole is not stable enough, so that a grouting layer wrapping the anchor rod body after grouting is extremely uneven, the grouting quality is poor, the anchoring effect is poor, and the anticorrosion effect of the grouting layer at a thinner part on the anchor rod body is also poor.
(3) Because the prestressed anchor rod needs to be prestressed when being installed, and the prestressing force is applied by pure manpower, the prestressed anchor rod has the defects of low efficiency, poor effect, time and labor waste and the like.
These problems all directly influence the quality and efficiency of tunnel anchor bolt support, further influence engineering quality and construction progress.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a lengthened anti-drop prestressed hollow grouting anchor rod and a supporting method thereof. According to the invention, the wedge-shaped two-wing structures designed on the shell expansion clamping piece are matched with the wedge-shaped grooves on the inner wedge, so that the phenomena that the shell expansion clamping piece is pulled away from the anchor rod and falls off from the head when pretightening force is applied can be effectively prevented; the invention can overcome the problem that the ultralong anchor rod is not easy to center by additionally arranging one or more fixers for fixing the anchor rod body and the anchor hole position in the middle of the anchor rod body; the invention effectively overcomes the defect of the prior art that the prestressing force is applied only by manpower by mechanically applying the prestressing force devices (the anchor rod connector sleeve and the anchor rod connector).
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides an extension anticreep prestressing force cavity slip casting stock, includes the anchor head and the stock body, the anchor head is including rising two shell clamping pieces that rise that shell inner wedge and symmetry set up on the shell inner wedge that rise shell inner wedge head symmetry that rises is provided with wedge groove and T capable groove rise be provided with respectively on the shell clamping piece with wedge groove and T capable groove complex wedge wing and T capable wing rise the excircle end of shell clamping piece is provided with the barb structure, rise the shell inner wedge and be connected with the stock body through the screw thread that the afterbody set up the end of the stock body sets gradually only thick liquid stopper, backing plate, ball nut and prestressing force device.
The invention also provides a supporting method of the lengthened anti-drop prestressed hollow grouting anchor rod, which comprises the following steps:
step one, assembling an anchoring head:
1) firstly, respectively loading two shell expansion clamping pieces into a shell expansion inner wedge from a T-shaped groove at the side of the shell expansion inner wedge;
2) the expansion shell clamping piece slides upwards along the T-shaped groove;
3) then the cushion block is placed at the bottom of the shell expansion clamping piece to jack up the shell expansion clamping piece;
4) after the assembly, the cushion block and the inner wedge of the expansion shell are welded together;
step two, connecting the anchor rod body:
connecting the assembled anchoring head with the first section of the anchor rod body, screwing the fixator into the middle of each subsequent section of the anchor rod body respectively, feeding the first section of the anchor rod body with the anchoring head into the anchor hole, and connecting the subsequent sections of the anchor rod body in sequence by using connecting sleeves when the first section of the anchor rod body is about to enter the anchor hole completely until the required length is met;
step three, sequentially arranging a grout stop plug, a base plate and a spherical nut at the tail end of the last section of the anchor rod body;
step four, mounting a prestress device and applying prestress through machinery;
and step five, after the prestress is applied, taking down the prestress device, grouting, and finishing the whole supporting process after grouting is finished.
Compared with the prior art, the invention has the following positive effects:
(1) after the anchoring head is assembled and welded, the shell expansion clamping piece cannot fall off, and the shell expansion clamping piece cannot fall off from the shell expansion inner wedge and lose the anchoring effect when prestress is applied due to poor surrounding rock conditions;
(2) the installation power of the anchor rod is improved, the construction quality and efficiency are further improved, and the construction cost is reduced;
(3) the anti-drop structure improves the matching use effect of the common prestressed anchor rod and the anchor rod trolley, and further improves the mechanization degree of tunnel construction;
(4) the grouting quality is improved, the anticorrosion effect is enhanced, and the loss of anchoring force is reduced;
(5) the mechanical prestress application is convenient, rapid, time-saving and labor-saving, and the mechanization degree of tunnel construction is improved.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of the overall structure of the lengthened anti-run prestressed hollow grouting anchor rod of the present invention;
FIG. 2 is a schematic structural view of an anchoring head;
FIG. 3 is a schematic structural view of an inner wedge of the expanding shell;
FIG. 4 is a schematic structural view of the expanding-shell clip;
FIG. 5 is a schematic view of a spacer;
FIG. 6 is a schematic view of the structure of the holder;
FIG. 7 is a schematic view of the construction of the sleeve of the anchor connector;
FIG. 8 is a schematic structural view of the anchor rod connector;
FIG. 9 is a schematic view of the connection of the ball nut 9 and the shank connector 11;
FIG. 10 is a schematic view of the connection of the ball nut 9, the anchor connector sleeve 10 and the anchor connector 11;
FIG. 11 is a schematic diagram of preliminary prestressing;
FIG. 12 is a schematic view of when secondary prestressing is initiated;
fig. 13 is a schematic view when the secondary prestressing is completed.
Detailed Description
An elongated anti-run prestressed hollow grouting anchor rod, as shown in fig. 1, comprising: shell splint 1 rises, cushion 2, the shell wedge 3 that rises, adapter sleeve 4, fixer 5, the stock body 6, only thick liquid stopper 7, backing plate 8, ball nut 9, stock connector sleeve 10, stock connector 11 etc. wherein:
firstly, an anti-drop principle:
as shown in fig. 2, an anchoring head is composed of a shell expansion clamping piece 1, a cushion block 2 and a shell expansion inner wedge 3; wherein: the tail part of the inner wedge 3 of the expanding shell is provided with threads for connecting with the anchor rod body 6, and the head part is provided with a symmetrical wedge-shaped groove 31 and a T-shaped groove 32 (shown in figure 3); the outer round end of the shell expansion clamping piece 1 is provided with a barb structure 43, and the inner part of the shell expansion clamping piece is provided with a wedge-shaped wing 41 and a T-shaped wing 42 (shown in figure 4). The T-shaped groove 32 of the inner wedge 3 of the expansion shell is convenient for laterally placing the expansion shell clamping piece 1; the wedge-shaped groove 31 is matched with the wedge-shaped wing 41, so that the shell-expanding clamping piece can be prevented from slipping from the upper part of the wedge in the shell, and the cushion block 2 (the structure is shown in figure 5) is placed at the lower end of the shell-expanding clamping piece 1, so that the clamping piece can be prevented from falling from the lower part.
The assembly method of the anchoring head is as follows:
1) firstly, the shell expansion clamping piece 1 is arranged in the shell expansion inner wedge 3 from a T-shaped groove 32 at the side of the shell expansion inner wedge 3;
2) the shell-expanding clamping piece 1 slides upwards along the T-shaped groove 32;
3) then the cushion block 2 is placed at the bottom of the shell-expanding clamping piece 1 to jack up the shell-expanding clamping piece;
4) after the assembly, the cushion block 2 and the inner wedge 3 of the expansion shell are welded together.
II, centering principle of an anchor rod:
the anchor rod body 6 is a hollow rod body and is a lengthened rod body formed by connecting two sections or three sections by connecting sleeves 4.
The fixer 5 is added between the connecting sleeve 4 and the grout stop plug 7, and if the anchor rod body is formed by connecting three sections of anchor rod bodies, the fixer 5 is added between the connecting sleeve and the connecting sleeve.
Because the anchor rod body is long, the deflection is big, and the interlude anchor rod body will be too close or direct contact with anchor eye wall distance, leads to the slip casting layer of the parcel anchor rod body after the slip casting inhomogeneous, influences the grouting effect and to the anticorrosive effect of anchor rod body. After the anchor is added, the maximum outer diameter of the anchor is close to the size of the anchor hole, and the convex round structure 51 (shown in figure 6) is adopted, so that the anchor hole has certain compressibility and can be well attached to the anchor hole, the anchor rod body is centered, the size of a gap between the anchor rod body and the wall of the anchor hole is kept consistent, a grouting layer is more uniform after grouting, and the grouting quality is improved.
Thirdly, the principle of mechanically applying prestress on anchor rod
The configuration of the bolt connector sleeve 10 is shown in figure 7 and the configuration of the bolt connector 11 is shown in figure 8.
The prestressing is applied in two steps:
in a first step, the anchor connector 11 is assembled on the ball nut 9, and the drilling machine can screw the anchor connector 11 for preliminary pre-tightening, as shown in fig. 9:
and secondly, taking down the anchor rod connector 11, connecting the spherical nut 9 with the anchor rod connector sleeve 10 firstly, then connecting the anchor rod connector sleeve 10 with the anchor rod connector 11, screwing the anchor rod connector 11 by the drilling machine to apply prestress for the second time, and compared with the manual prestress application, the whole process is convenient, rapid, time-saving and labor-saving, and is shown in fig. 10.
Supporting process
The assembled anchoring heads are connected with one of the anchor rod bodies, the fixer 5 is screwed into the middle part of the other anchor rod body, then the anchor rod body with the anchoring heads is sent into the anchor hole, when the anchor rod bodies are about to completely enter the anchor hole, the connecting sleeve 4 is connected with the other anchor rod body, and then the grout stop plug 7, the backing plate 8, the spherical nut 9 and the anchor rod connector 11 are sequentially arranged in the anchor hole, as shown in figure 11.
⑴ when the anchor rod extends to the top of the anchor hole, the anchor rod connector 11 is screwed by the drilling machine, because the anchor head and the inner wall of the anchor hole have friction, the anchor rod body can be screwed in and pushed out the shell-expanding clamping piece, the shell-expanding clamping piece is expanded initially, the initial prestress application is completed;
⑵ removing the anchor connector 11, loading into the anchor connector sleeve 10 and anchor connector 11, screwing the anchor connector 11 to force the anchor rod body to drive the inner wedge of the expanding shell to move outwards, and further expanding the expanding shell clamping piece as the barb structure of the expanding shell clamping piece is clamped in the anchor hole wall, as shown in FIG. 12;
⑶ the anchor rod connector is screwed continuously, when the anchor rod connector moves a certain distance, the expanding shell clamping piece is expanded completely, because the size of the wedge-shaped slot of the expanding shell inner wedge is smaller than that of the wedge-shaped wing of the expanding shell clamping piece, the expanding shell clamping piece can not move outwards continuously, thereby preventing the expanding shell clamping piece from falling off from the expanding shell inner wedge, and the secondary prestressing is applied, as shown in fig. 13.
After the prestress is applied, the anchor rod connector and the anchor rod connector sleeve are taken down, grouting is carried out again, and the anchor rod body can be centered and stabilized by the fixer during grouting, so that the anchor rod body is not shaken, and the grouting thickness is uniform. And finishing the whole installation process after grouting is finished.
Claims (9)
1. The utility model provides a extension anticreep prestressing force cavity slip casting stock which characterized in that: including anchor head and the stock body, the anchor head is including rising two shell clamping pieces that rise that shell inner wedge and symmetry set up on the shell inner wedge rise shell inner wedge shell head symmetry of rising is provided with wedge groove and T capable groove rise be provided with respectively on the shell clamping piece with wedge groove and T capable groove complex wedge wing and T capable wing rise the excircle end of shell clamping piece is provided with the barb structure, rise the shell inner wedge and be connected with the stock body through the screw thread that the afterbody set up the end of the stock body sets gradually only to starch stopper, backing plate, ball nut and prestressing force device.
2. The elongated anti-run-off prestressed hollow grouting anchor rod according to claim 1, characterized in that: and a cushion block is arranged at the bottom of the expansion shell clamping piece, and the cushion block and the expansion shell inner wedge are welded together.
3. The elongated anti-run-off prestressed hollow grouting anchor rod according to claim 1, characterized in that: the anchor rod body is a lengthened rod body formed by connecting at least two sections of hollow rod bodies through connecting sleeves.
4. The elongated anti-run-off prestressed hollow grouting anchor rod according to claim 3, characterized in that: and a fixer is arranged between the connecting sleeve and the grout stopping plug.
5. The elongated anti-run-off prestressed hollow grouting anchor rod according to claim 3, characterized in that: a fixer is arranged between the two connecting sleeves.
6. The elongated anti-run-off prestressed hollow grouting anchor rod according to claim 4 or 5, characterized in that: the fixer adopts a convex structure.
7. The elongated anti-run-off prestressed hollow grouting anchor rod according to claim 1, characterized in that: the pre-stressing means comprises a shank connector and a shank connector sleeve.
8. A support method using the lengthened anti-drop prestressed hollow grouting anchor rod of claim 1, characterized in that: the method comprises the following steps:
step one, assembling an anchoring head:
1) firstly, respectively loading two shell expansion clamping pieces into a shell expansion inner wedge from a T-shaped groove at the side of the shell expansion inner wedge;
2) the expansion shell clamping piece slides upwards along the T-shaped groove;
3) then the cushion block is placed at the bottom of the shell expansion clamping piece to jack up the shell expansion clamping piece;
4) after the assembly, the cushion block and the inner wedge of the expansion shell are welded together;
step two, connecting the anchor rod body:
connecting the assembled anchoring head with the first section of the anchor rod body, screwing the fixator into the middle of each subsequent section of the anchor rod body respectively, feeding the first section of the anchor rod body with the anchoring head into the anchor hole, and connecting the subsequent sections of the anchor rod body in sequence by using connecting sleeves when the first section of the anchor rod body is about to enter the anchor hole completely until the required length is met;
step three, sequentially arranging a grout stop plug, a base plate and a spherical nut at the tail end of the last section of the anchor rod body;
step four, mounting a prestress device and applying prestress through machinery;
and step five, after the prestress is applied, taking down the prestress device, grouting, and finishing the whole supporting process after grouting is finished.
9. The method for supporting an elongated anti-drop prestressed hollow grouting anchor rod according to claim 8, wherein: step four the method for applying prestress by machine comprises the following steps:
1) assembling the anchor rod connector on the spherical nut;
2) when the anchor rod extends to the top end of the anchor hole, a drilling machine is adopted to screw the anchor rod connector for preliminary pre-tightening, under the action of friction force between the anchoring head and the inner wall of the anchor hole, the anchor rod body is screwed in and ejects out the shell expansion clamping piece, the shell expansion clamping piece is preliminarily expanded, and preliminary pre-stress application is completed;
3) then taking down the anchor rod connector, sequentially installing the anchor rod connector sleeve and the anchor rod connector, screwing the anchor rod connector by a drilling machine to force the anchor rod body to drive the inner wedge of the expanding shell to move outwards, clamping the barb structure of the clamping piece of the expanding shell in the wall of the anchor hole, and further expanding the clamping piece of the expanding shell;
4) and the drilling machine continues to screw the anchor rod connector until the expansion shell clamping piece is completely expanded and the expansion shell clamping piece cannot continue to move outwards under the prevention of the wedge-shaped groove of the wedge in the expansion shell, so that the secondary prestress application is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010117026.XA CN111255494B (en) | 2020-02-25 | 2020-02-25 | Lengthened anti-drop prestressed hollow grouting anchor rod and supporting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010117026.XA CN111255494B (en) | 2020-02-25 | 2020-02-25 | Lengthened anti-drop prestressed hollow grouting anchor rod and supporting method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111255494A true CN111255494A (en) | 2020-06-09 |
| CN111255494B CN111255494B (en) | 2021-10-26 |
Family
ID=70947416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010117026.XA Active CN111255494B (en) | 2020-02-25 | 2020-02-25 | Lengthened anti-drop prestressed hollow grouting anchor rod and supporting method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111255494B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111894625A (en) * | 2020-08-13 | 2020-11-06 | 高军 | Large-section weak surrounding rock high-prestress anchor rod supporting method and device |
| CN112832836A (en) * | 2021-03-04 | 2021-05-25 | 淮北市平远软岩支护工程技术有限公司 | Support method and support equipment for problem of ejection of anchor rod and anchor cable cover plate |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205399435U (en) * | 2016-02-24 | 2016-07-27 | 北京新创展基础工程有限公司 | Antiskid prestressed anchorage cable |
| CN206889003U (en) * | 2017-06-30 | 2018-01-16 | 闫捷 | A kind of roadway support anti-loosening anchor rod |
| CN207959733U (en) * | 2017-12-21 | 2018-10-12 | 北京东方雨虹防水技术股份有限公司 | A kind of waterproof layer fixing device |
| CN109209455A (en) * | 2018-09-26 | 2019-01-15 | 浙江普泰克金属制品有限公司 | A kind of expansion shell type prestressing force hollow grouting anchor with plasma resistance plug |
| CN109707425A (en) * | 2019-03-12 | 2019-05-03 | 中铁隆昌铁路器材有限公司 | The frictional pressure-relieving achor bar of the hollow slip casting of prestressing force and method for protecting support |
| CN209354180U (en) * | 2019-01-09 | 2019-09-06 | 中铁隆昌铁路器材有限公司 | Be translatable anti-rotation inverted wedge swelled prestressed anchor |
| CN209354179U (en) * | 2019-01-09 | 2019-09-06 | 中铁隆昌铁路器材有限公司 | Be translatable swelled prestressing force hollow bolt |
| CN110331998A (en) * | 2019-07-24 | 2019-10-15 | 古小辉 | A kind of adaptive pressure release type grouted anchor bar |
| CN209494813U (en) * | 2018-11-09 | 2019-10-15 | 浙江天开实业有限公司 | A kind of tapered expansion pipe |
| CN209523189U (en) * | 2019-01-09 | 2019-10-22 | 中铁隆昌铁路器材有限公司 | A kind of novel expansion shell type anchoring head |
-
2020
- 2020-02-25 CN CN202010117026.XA patent/CN111255494B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205399435U (en) * | 2016-02-24 | 2016-07-27 | 北京新创展基础工程有限公司 | Antiskid prestressed anchorage cable |
| CN206889003U (en) * | 2017-06-30 | 2018-01-16 | 闫捷 | A kind of roadway support anti-loosening anchor rod |
| CN207959733U (en) * | 2017-12-21 | 2018-10-12 | 北京东方雨虹防水技术股份有限公司 | A kind of waterproof layer fixing device |
| CN109209455A (en) * | 2018-09-26 | 2019-01-15 | 浙江普泰克金属制品有限公司 | A kind of expansion shell type prestressing force hollow grouting anchor with plasma resistance plug |
| CN209494813U (en) * | 2018-11-09 | 2019-10-15 | 浙江天开实业有限公司 | A kind of tapered expansion pipe |
| CN209354180U (en) * | 2019-01-09 | 2019-09-06 | 中铁隆昌铁路器材有限公司 | Be translatable anti-rotation inverted wedge swelled prestressed anchor |
| CN209354179U (en) * | 2019-01-09 | 2019-09-06 | 中铁隆昌铁路器材有限公司 | Be translatable swelled prestressing force hollow bolt |
| CN209523189U (en) * | 2019-01-09 | 2019-10-22 | 中铁隆昌铁路器材有限公司 | A kind of novel expansion shell type anchoring head |
| CN109707425A (en) * | 2019-03-12 | 2019-05-03 | 中铁隆昌铁路器材有限公司 | The frictional pressure-relieving achor bar of the hollow slip casting of prestressing force and method for protecting support |
| CN110331998A (en) * | 2019-07-24 | 2019-10-15 | 古小辉 | A kind of adaptive pressure release type grouted anchor bar |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111894625A (en) * | 2020-08-13 | 2020-11-06 | 高军 | Large-section weak surrounding rock high-prestress anchor rod supporting method and device |
| CN111894625B (en) * | 2020-08-13 | 2022-03-08 | 高军 | Large-section weak surrounding rock high-prestress anchor rod supporting method and device |
| CN112832836A (en) * | 2021-03-04 | 2021-05-25 | 淮北市平远软岩支护工程技术有限公司 | Support method and support equipment for problem of ejection of anchor rod and anchor cable cover plate |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111255494B (en) | 2021-10-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111255494B (en) | Lengthened anti-drop prestressed hollow grouting anchor rod and supporting method thereof | |
| US11041385B2 (en) | Mining hydraulic constant-resistance deforming and automatic pressure relieving anchor rod and working method thereof | |
| CN105370303A (en) | Tensioning device for deep roadway high-prestress anchor bolt support and operation method thereof | |
| CN103277122B (en) | Method for drilling anchor rod hole and anchoring anchor rod in broken roof | |
| CN211777524U (en) | Lengthened anti-drop prestressed hollow grouting anchor rod | |
| CN109751067B (en) | Method for improving pre-pulling force of anchor rod | |
| CN112942685B (en) | Novel anchoring system and anchoring method for fiber reinforced resin composite material rod | |
| CN108979691A (en) | A kind of multistage pressure-relieving achor bar | |
| CN107387140A (en) | A kind of multi-cylinder anchor rod hydraulic tensioning equipment and anchor pole method for stretching | |
| CN205477689U (en) | Resistance to plucking prestressed anchorage pole | |
| CN105346677A (en) | Folding type plate anchor and application method thereof | |
| CN112459818A (en) | Special anti-loosening anchor rod for roadway support | |
| CN205135675U (en) | A tension device that is used for high prestressed anchorage pole in deep tunnel to strut | |
| CN109252518B (en) | Variable-diameter anchor rod and anchoring method thereof | |
| CN211472216U (en) | Stress low-loss, low-retraction and self-locking anchorage device | |
| CN220551140U (en) | But reuse's stock | |
| CN108360538B (en) | Prestressed anchor cable | |
| CN112647497A (en) | In-hole prestressed supporting member, prestressed anchor rod and construction method | |
| CN112360534A (en) | Full-anchor grouting anchor rod and anchoring method thereof | |
| CN112983519B (en) | High-pretightening-force anchor rod capable of actively and rapidly realizing three-dimensional stress balance and anchoring method thereof | |
| CN206035512U (en) | Novel slip casting stock | |
| CN112431625A (en) | Embedded constant-resistance energy absorption device | |
| CN211314250U (en) | Mechanical anchor rod capable of applying pretightening force and recycling | |
| CN220469965U (en) | Mixed type resin anchoring model test anchor rod with controllable anchoring length | |
| CN219220464U (en) | Novel screw end rod anchorage for bonding end type prestressed anchor rod |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |