CN112796807A - Radial single-end double-expansion grouting anchor rod for broken rock stratum tunnel - Google Patents
Radial single-end double-expansion grouting anchor rod for broken rock stratum tunnel Download PDFInfo
- Publication number
- CN112796807A CN112796807A CN202110174933.2A CN202110174933A CN112796807A CN 112796807 A CN112796807 A CN 112796807A CN 202110174933 A CN202110174933 A CN 202110174933A CN 112796807 A CN112796807 A CN 112796807A
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- China
- Prior art keywords
- steel pipe
- grouting
- hollow threaded
- broken rock
- anchor rod
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Links
- 239000011435 rock Substances 0.000 title claims abstract description 56
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 72
- 239000010959 steel Substances 0.000 claims abstract description 72
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 20
- 239000004746 geotextile Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 3
- 230000002787 reinforcement Effects 0.000 description 10
- 230000003014 reinforcing effect Effects 0.000 description 4
- 238000005056 compaction Methods 0.000 description 3
- 239000011440 grout Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/021—Grouting with inorganic components, e.g. cement
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- 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)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a radial single-end bidirectional expansion grouting anchor rod for a broken rock stratum tunnel, which comprises an anchor rod outer steel pipe, a hollow threaded steel pipe, an upper end conical jacking head, a grouting bag and a bolt, wherein the upper end of the hollow threaded steel pipe is provided with a conical jacking head; the hollow threaded steel pipe is embedded in the outer steel pipe, the bolt is in threaded connection with the hollow threaded steel pipe and is arranged above the outer steel pipe, the length of the outer steel pipe is smaller than that of the hollow threaded steel pipe, the bottom of the outer steel pipe is provided with a notch, the middle of the hollow threaded steel pipe is provided with a conical jacking head, the diameter of the outer edge of the conical jacking head is larger than that of the outer steel pipe, the bottom of the hollow threaded steel pipe is connected with a grouting bag, and a grouting hole is formed in the hollow threaded steel pipe between the conical jacking head and the grouting bag. The method can effectively enhance the stability of the tunnel surrounding rock of the broken rock stratum, reduce the collapse of the broken rock stratum caused by tunnel construction, reduce the engineering construction cost and improve the engineering construction speed.
Description
Technical Field
The invention relates to a radial single-end double-expansion grouting anchor rod for a broken rock stratum tunnel, in particular to a novel grouting anchor rod suitable for reinforcing surrounding rock of the broken rock stratum tunnel, and belongs to the field of underground engineering.
Background
Along with the development of the construction of the strong traffic countries in China, the construction scale of high-grade roads and railway tunnels is continuously enlarged, and tunnel engineering construction inevitably passes through a broken rock stratum region; after the initial state of the broken rock stratum is changed, the rock stratum is easy to collapse, and the life safety of a constructor is threatened. However, the traditional broken rock tunnel is radially reinforced by adopting a small advanced pipe or a large pipe shed, so that the construction cost is high, and the time consumption is long. It is known that rock masses in fractured rock formations of nature are overlapped and supported to achieve overall stability. Therefore, based on a theoretical system of mutual overlapping and supporting of broken rock strata, the novel grouting anchor rod suitable for reinforcing the tunnel surrounding rock of the broken rock strata is provided, and comprises a single-ended bidirectional expansion device and a grouting device; the single-end bidirectional expansion device can realize short-distance expansion of a rock stratum space and compaction of rock stratum pores in a broken rock stratum and provide a space for a specified grouting area; the grouting device is arranged at the front section of the anchor rod, the box sleeve is arranged between the single-end bidirectional expansion devices, and grouting reinforcement can be performed in a specified area of the broken rock stratum according to design requirements so as to realize stable reinforcement of the local area of the broken rock stratum. The stability of the tunnel surrounding rock of the broken rock stratum can be effectively enhanced, the collapse of the broken rock stratum caused by tunnel construction is reduced, the engineering construction cost can be reduced, and the engineering construction speed is increased.
Disclosure of Invention
Aiming at the problems, the invention provides the radial single-end bidirectional expansion grouting anchor rod for the broken rock stratum tunnel, which can effectively enhance the stability of the surrounding rock of the broken rock stratum tunnel, reduce the collapse of the broken rock stratum caused by tunnel construction, reduce the engineering construction cost and improve the engineering construction speed. The technical scheme of the invention is as follows:
a radial single-end bidirectional expansion grouting anchor rod for a broken rock stratum tunnel comprises an anchor rod outer steel pipe, a hollow threaded steel pipe, a conical jacking head, a grouting bag and a bolt; the hollow threaded steel pipe is embedded in the outer steel pipe, the bolt is in threaded connection with the hollow threaded steel pipe and is arranged above the outer steel pipe, the length of the outer steel pipe is smaller than that of the hollow threaded steel pipe, the bottom of the outer steel pipe is provided with a notch, the middle of the hollow threaded steel pipe is provided with a conical jacking head, the diameter of the outer edge of the conical jacking head is larger than the outer diameter of the outer steel pipe, the bottom of the hollow threaded steel pipe is connected with a grouting bag, and a grouting hole is formed in the hollow threaded steel pipe between the conical jacking head and the grouting bag.
When the bolt is rotated, the hollow deformed steel bar moves upwards, and the outer steel tube is propped outwards by the conical jacking head due to the fact that the notch is formed in the outer steel tube, so that the expansion reinforcement effect is achieved; grouting the grouting bag by using the grouting pipe to penetrate through the hollow threaded steel pipe, and after the top expansion reinforcement is finished, expanding and extruding the periphery of the grouting bag to crush surrounding rock so as to realize the bottom expansion reinforcement effect; and after the grout in the grouting bag is solidified, pulling out the grouting pipe, grouting into the hollow threaded steel pipe, and filling the grout into a preset grouting area through the grouting hole to realize directional surrounding rock reinforcement.
Further, the inner diameter of the hollow threaded steel pipe is 0.18m, and the length of the hollow threaded steel pipe is 2.00 m; the length of the outer steel pipe is 1.5 m; the length of the gap is 0.1 m; the conical jacking head is welded on the hollow threaded steel pipe; the aperture of the grouting hole is 5cm (diameter); the grouting bag is made of geotextile.
The radial single-end bidirectional expansion grouting anchor rod for the broken rock stratum tunnel can realize short-distance expansion of rock stratum space and compaction of rock stratum pores in the broken rock stratum and provide space for a designated grouting area; the area between the grouting bag and the conical jacking head is a grouting reinforcement area, and grouting reinforcement can be performed on the designated area of the broken rock stratum according to design requirements, so that reinforcement stability of the local area of the broken rock stratum is realized.
Compared with the prior art, the invention has the following advantages:
1. after the effective grouting range is set, on one hand, the grouting cost can be reduced, and the diffusion range of the grout is reduced; on the other hand, the stability of surrounding rocks in the local area of the broken rock stratum can be enhanced, so that the reinforcing requirement can be met.
2. The single-ended bidirectional expansion device can realize the tight compaction of an upper small area and a lower small area in a small range, and plays a role in anchoring and expanding.
3. The radial single-end double-expansion grouting anchor rod has the advantages of convenience in construction and flexibility in arrangement, and can be flexibly arranged according to actual working conditions.
Drawings
FIG. 1 is a schematic view of construction of a radial single-end bidirectional expansion grouting anchor rod of a broken rock stratum tunnel;
FIG. 2 is a structural schematic diagram of a broken rock tunnel radial single-end bidirectional expansion grouting anchor rod;
fig. 3 is a schematic view of the working principle of a radial single-end bidirectional expansion grouting anchor rod of a broken rock stratum tunnel.
Description of the symbols:
1. the method comprises the following steps of tunneling, 2, rock stratum breaking, 3, grouting and reinforcing, 4, a grouting opening, 5, a grouting pipe, 6, a hollow threaded steel pipe, 7, an outer steel pipe, 8, a conical jacking head, 9, a grouting hole, 10, a grouting bag, 11, a bolt and 12, and a notch.
Detailed Description
The invention will be further described with reference to specific embodiments, and the advantages and features of the invention will become apparent as the description proceeds. The examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
Example (b): radial single-end bidirectional expansion grouting anchor rod for broken rock stratum tunnel
As shown in fig. 1-3, the broken rock tunnel radial single-end bidirectional expansion grouting anchor rod comprises an anchor rod outer steel pipe 7, a hollow threaded steel pipe 6, a conical jacking head 8, a grouting bag 10 and a bolt 11; the hollow threaded steel pipe 6 is embedded in the outer steel pipe 7, the bolt 11 is in threaded connection with the hollow threaded steel pipe 6 and is arranged above the outer steel pipe 7, the length of the outer steel pipe 7 is smaller than that of the hollow threaded steel pipe 6, a notch 12 is formed in the bottom of the outer steel pipe 7, a conical jacking head 8 is arranged in the middle of the hollow threaded steel pipe 6, the diameter of the outer edge of the conical jacking head 8 is larger than the outer diameter of the outer steel pipe 7, the bottom of the hollow threaded steel pipe 6 is connected with a grouting bag 10, and a grouting hole 9 is formed in the hollow threaded steel pipe 6 between the conical jacking head 8 and the grouting bag 10;
the inner diameter of the hollow threaded steel pipe 6 is 0.18m, and the length is 2.00 m; the length of the outer steel pipe 7 is 1.5 m; the length of the gap 12 is 0.1 m; the conical jacking head 8 is welded on the hollow threaded steel pipe 6; the aperture of the grouting hole 9 is 5cm (diameter); the grouting bag 10 is made of geotextile.
The implementation method of the invention comprises the following steps:
inserting the grouting pipe 5 into the hollow threaded steel pipe 6, and grouting into the bottom grouting bag 10 to extrude surrounding broken surrounding rocks; and after the slurry in the grouting bag 10 is stabilized, pulling out the grouting pipe 5, grouting into the hollow threaded steel pipe 6, and filling cement mortar into the broken rock stratum through the grouting holes 9 to complete the reinforcement of the anchor rod.
Claims (7)
1. A radial single-end bidirectional expansion grouting anchor rod for a broken rock stratum tunnel is characterized by comprising an anchor rod outer steel pipe, a hollow threaded steel pipe, an upper-end conical jacking head, a grouting bag and a bolt; the hollow threaded steel pipe is embedded in the outer steel pipe, the bolt is in threaded connection with the hollow threaded steel pipe and is arranged above the outer steel pipe, the length of the outer steel pipe is smaller than that of the hollow threaded steel pipe, the bottom of the outer steel pipe is provided with a notch, the middle of the hollow threaded steel pipe is provided with a conical jacking head, the diameter of the outer edge of the conical jacking head is larger than that of the outer steel pipe, the bottom of the hollow threaded steel pipe is connected with a grouting bag, and a grouting hole is formed in the hollow threaded steel pipe between the conical jacking head and the grouting bag.
2. The broken rock stratum tunnel radial single-end bidirectional expansion grouting anchor rod as claimed in claim 1, wherein the hollow threaded steel pipe is 0.18m in inner diameter and 2.00m in length.
3. The broken rock tunnel radial single-end bidirectional expansion grouting anchor rod as claimed in claim 1, wherein the length of the outer steel pipe is 1.5 m.
4. The broken rock stratum tunnel radial single-end bidirectional expansion grouting anchor rod as claimed in claim 1, wherein the length of the gap is 0.1 m.
5. The broken rock tunnel radial single-end bidirectional expansion grouting anchor rod as claimed in claim 1, wherein the conical jacking head is welded on a hollow threaded steel pipe.
6. The broken rock tunnel radial single-end bidirectional expansion grouting anchor rod as claimed in claim 1, wherein the diameter of the grouting hole is 5 cm.
7. The broken rock stratum tunnel radial single-end bidirectional expansion grouting anchor rod as claimed in claim 1, wherein the grouting bag is made of geotextile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110174933.2A CN112796807B (en) | 2021-02-09 | 2021-02-09 | Radial single-end double-expansion grouting anchor rod for broken rock stratum tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110174933.2A CN112796807B (en) | 2021-02-09 | 2021-02-09 | Radial single-end double-expansion grouting anchor rod for broken rock stratum tunnel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112796807A true CN112796807A (en) | 2021-05-14 |
| CN112796807B CN112796807B (en) | 2022-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110174933.2A Active CN112796807B (en) | 2021-02-09 | 2021-02-09 | Radial single-end double-expansion grouting anchor rod for broken rock stratum tunnel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112796807B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114320405A (en) * | 2022-01-06 | 2022-04-12 | 重庆交通大学 | Tunnel ultra-shallow buried broken surrounding rock artificial arching support system and method |
| CN115198722A (en) * | 2022-08-24 | 2022-10-18 | 青岛理工大学 | Anchor rod for reinforcing soft soil foundation of flood plain terrain |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202380463U (en) * | 2011-12-19 | 2012-08-15 | 中铁第四勘察设计院集团有限公司 | Grouting capsule type recyclable anchor cable |
| CN202416313U (en) * | 2011-12-21 | 2012-09-05 | 中铁第四勘察设计院集团有限公司 | Anchor rod with expanded ends |
| CN103161485A (en) * | 2011-12-16 | 2013-06-19 | 洛阳工岩科技有限公司 | Pre-stressed anchoring conduit |
| CN105714822A (en) * | 2016-02-29 | 2016-06-29 | 中国京冶工程技术有限公司 | Assembly type expanded-base grouting anchoring structure device and assembly construction method |
| CN107034881A (en) * | 2017-06-11 | 2017-08-11 | 贵州大学 | A kind of flexible telescopic grouted anchor bar of bullet |
| CN206503613U (en) * | 2016-12-27 | 2017-09-19 | 长安大学 | It is a kind of to bore hollow slip casting expansion anchor rod certainly |
| CN206873518U (en) * | 2016-12-21 | 2018-01-12 | 山东中车风电有限公司 | One kind repairs blower foundation cracking pre-buried grouted anchor bar, system |
| CN109469055A (en) * | 2018-12-20 | 2019-03-15 | 长安大学 | A kind of part pipe seam formula end expansion type energy-absorption anchor rod and its construction method |
| CN109595020A (en) * | 2018-12-30 | 2019-04-09 | 浙江工业大学 | A kind of slip casting bellows enlarged footing anchor pole and application method for tunnel correction |
| CN210917345U (en) * | 2019-09-29 | 2020-07-03 | 安徽永昊建设工程有限公司 | Grouting bag type enlarged end anchor rod |
-
2021
- 2021-02-09 CN CN202110174933.2A patent/CN112796807B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103161485A (en) * | 2011-12-16 | 2013-06-19 | 洛阳工岩科技有限公司 | Pre-stressed anchoring conduit |
| CN202380463U (en) * | 2011-12-19 | 2012-08-15 | 中铁第四勘察设计院集团有限公司 | Grouting capsule type recyclable anchor cable |
| CN202416313U (en) * | 2011-12-21 | 2012-09-05 | 中铁第四勘察设计院集团有限公司 | Anchor rod with expanded ends |
| CN105714822A (en) * | 2016-02-29 | 2016-06-29 | 中国京冶工程技术有限公司 | Assembly type expanded-base grouting anchoring structure device and assembly construction method |
| CN206873518U (en) * | 2016-12-21 | 2018-01-12 | 山东中车风电有限公司 | One kind repairs blower foundation cracking pre-buried grouted anchor bar, system |
| CN206503613U (en) * | 2016-12-27 | 2017-09-19 | 长安大学 | It is a kind of to bore hollow slip casting expansion anchor rod certainly |
| CN107034881A (en) * | 2017-06-11 | 2017-08-11 | 贵州大学 | A kind of flexible telescopic grouted anchor bar of bullet |
| CN109469055A (en) * | 2018-12-20 | 2019-03-15 | 长安大学 | A kind of part pipe seam formula end expansion type energy-absorption anchor rod and its construction method |
| CN109595020A (en) * | 2018-12-30 | 2019-04-09 | 浙江工业大学 | A kind of slip casting bellows enlarged footing anchor pole and application method for tunnel correction |
| CN210917345U (en) * | 2019-09-29 | 2020-07-03 | 安徽永昊建设工程有限公司 | Grouting bag type enlarged end anchor rod |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114320405A (en) * | 2022-01-06 | 2022-04-12 | 重庆交通大学 | Tunnel ultra-shallow buried broken surrounding rock artificial arching support system and method |
| CN114320405B (en) * | 2022-01-06 | 2024-05-14 | 重庆交通大学 | Tunnel ultra-shallow buried broken surrounding rock artificial arching supporting system and method |
| CN115198722A (en) * | 2022-08-24 | 2022-10-18 | 青岛理工大学 | Anchor rod for reinforcing soft soil foundation of flood plain terrain |
| CN115198722B (en) * | 2022-08-24 | 2024-08-16 | 青岛理工大学 | Anchor rod for reinforcing soft soil foundation of flood beach topography |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112796807B (en) | 2022-05-17 |
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