CN109538265A - Tunnel overlength enlarged footing anchor cable and its method for protecting support - Google Patents
Tunnel overlength enlarged footing anchor cable and its method for protecting support Download PDFInfo
- Publication number
- CN109538265A CN109538265A CN201710867944.2A CN201710867944A CN109538265A CN 109538265 A CN109538265 A CN 109538265A CN 201710867944 A CN201710867944 A CN 201710867944A CN 109538265 A CN109538265 A CN 109538265A
- Authority
- CN
- China
- Prior art keywords
- cable body
- enlarged footing
- cable
- overlength
- pole
- 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.)
- Pending
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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
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/008—Anchoring or tensioning means
Abstract
The invention discloses a kind of tunnel overlength enlarged footing anchor cables, including overlength cable body, the enlarged footing for being set to the cable body inner end, the Pressure-bearing pads for being coated at the cable body, anchor with the cable body and compress the anchorage of Pressure-bearing pads using the prestressing force of cable body, are set to the cable body outer end for carrying out the hydraulic jack of tensioning to cable body；The enlarged footing can be radially furthered out to form wedge structure along cable body；Branch at the beginning of this anchor cable can greatly reduce the later period changes the number that arch and two linings change, and saves the spending of duration, personnel and goods and materials, accelerates construction speed.
Description
Technical field
The present invention relates to small-clear-distance tunnel construction field, specifically a kind of tunnel overlength enlarged footing anchor cable and its supporting side
Method.
Background technique
High-ground stress Support System in Soft Rock Tunnels country rock after excavation supporting be squeezed and deformed it is strong, cause just branch extensive damage,
Gunite concrete cracking, steelframe distortion bad break, abutment wall invade limit etc..And release of the high-ground stress in Support System in Soft Rock Tunnels is one
A long-term slow process, causing early period, ready-made two lining constantly cracks in the later period, needs to re-start trimming of doing over again.
Therefore, rock crusher, crustal stress are larger and the problems such as deenergized period is long causes constructing tunnel deformation big, and process conversion, scheme become
More frequently, construction production is discontinuous, work efficiency is low, serious to perplex constructing aims and construction safety.
It can be good at solving the problems, such as that Support System in Soft Rock Tunnels is squeezed and deformed therefore, it is necessary to one kind, at the beginning of greatly reducing the later period
Branch changes the number that arch and two linings change, and saves the spending of duration, personnel and goods and materials, accelerates construction speed, improves enterprise
Productivity effect tunnel overlength enlarged footing anchor cable and its method for protecting support.
Summary of the invention
In view of this, providing one kind can be soft to high-ground stress the purpose of the present invention is overcoming defect in the prior art
Weak country rock large deformation is effectively controlled；Have the function of resource-effective, environmental protection and energy saving tunnel overlength enlarged footing anchor cables simultaneously.
Tunnel overlength enlarged footing anchor cable of the invention, including overlength cable body, the enlarged footing that is set to the cable body inner end, outer
The Pressure-bearing pads of the cable body are placed on, are anchored with the cable body and compresses the anchorage of Pressure-bearing pads using the prestressing force of cable body, set
The cable body outer end is placed in for carrying out the hydraulic jack of tensioning to cable body；The enlarged footing can be radially furthered out along cable body
Form wedge structure；
Further, the enlarged footing includes center-pole and along circumferentially equally distributed multiple two connection rod sets of center-pole, described
Center-pole outer wall is fixed in the inner end of two connection rod sets, and outer end can slide axially along center-pole, and make two connection rod sets by the sliding
Expansion outward；
Further, the center-pole sliding outer cover has sliding sleeve, and the outer end of two connection rod set is articulated with the sliding sleeve；
Further, the center-pole is equipped with the stop collar for being limited to the sliding of the sliding；
The invention also discloses a kind of methods for carrying out supporting using overlength enlarged footing anchor cable, comprising the following steps:
S1. scene is provided with multiple test miles sections, in tunnel excavation different time sections, carries out respectively to prestress anchorage cable
Rock deformation around hole is observed in tensioning；S2. the anchorage cable stretching best opportunity is obtained according to rock deformation around the hole.
The beneficial effects of the present invention are: increasing anchor cable hole bottom anchoring section using prestressing force overlength enlarged footing anchor cable construction
Consolidate range, improve the anchor force and withdrawal resistance of bottom hole, while strengthening the skid resistance of country rock sliding surface, with maintain country rock by
Dynamic balance.The wedge shaped structure of enlarged footing anchor cable keeps country rock and first branch structure closely connected, plays self to greatest extent, symbol
Close New Austrian Tunneling Method principle deformation controlling for rock surrounding gateways.Using geological drilling rig casing follow-up technology, solves overlength anchor cable construction problem in hole；
Two-wire small spacing Support System in Soft Rock Tunnels overlength anchor cable reasonable tensioning opportunity in method for protecting support of the invention reduces double hole construction phases
Mutually influence.Double holes influence each other greatly in the construction process, and surrouding rock deformation is not easy to control.Scene is provided with multiple test miles sections,
In tunnel excavation different time sections, tensioning is carried out to observe rock deformation around hole to prestress anchorage cable respectively, is finally obtained
The anchorage cable stretching best opportunity: leading hole and Hou Hangdong are separated by a plate two lining+interim inverted arch cooperation anchor cable and follow up in time, surrouding rock deformation
Good control is obtained.
Detailed description of the invention
The invention will be further described with reference to the accompanying drawings and examples:
Fig. 1 is the structural schematic diagram of anchor cable of the invention；
Fig. 2 is the schematic diagram of enlarged footing of the invention.
Specific embodiment
Fig. 1 is the structural schematic diagram of anchor cable 1 of the invention.Fig. 2 is the schematic diagram of enlarged footing of the invention.The present embodiment
Tunnel overlength enlarged footing anchor cable 1 including overlength cable body, the enlarged footing that is set to the cable body inner end, is coated at the cable body
Pressure-bearing pads 2 compress the anchorage 4 of Pressure-bearing pads 2 with cable body anchoring and using the prestressing force of cable body, are set to the cable body
Outer end is used to carry out cable body the hydraulic jack 3 of tensioning；The enlarged footing can be radially furthered out to form wedge-shaped knot along cable body
Structure；It is constructed using prestressing force overlength enlarged footing anchor cable 1 and increases the consolidation range of 1 bottom hole anchoring section of anchor cable, improve bottom hole
Anchor force and withdrawal resistance, while the skid resistance of country rock sliding surface is strengthened, to maintain force-bearing of surrounding rock mass to balance.Enlarged footing anchor cable 1 is in
Wedge structure keeps country rock and first branch structure closely connected, plays self to greatest extent, meets New Austrian Tunneling Method principle control country rock
Deformation.Using geological drilling rig casing follow-up technology, solves 1 construction difficult problem of overlength anchor cable in hole.
In the present embodiment, the enlarged footing includes center-pole 7 and along circumferential equally distributed multiple two connection rod sets of center-pole 7
8, two connection rod sets 8 include two connecting rods being hinged, and 7 outer wall of center-pole is fixed in the inner end of two connection rod set 8, and outer end can
It slides axially along center-pole 7, and two expansion outward of connection rod set 8 is made by the sliding, 7 lower end of center-pole is equipped with cone 9, passes through cone
Point 9 can reduce the resistance that enlarged footing is pierced into drilling, and circumferentially distributed on the conical surface of cone there are three side wing 10, side wings
10 can be improved the resistance to plucking of enlarged footing.
In the present embodiment, 7 sliding outer cover of center-pole has sliding sleeve 5, and the outer end of two connection rod set 8 is articulated with the cunning
Set 5.
In the present embodiment, the center-pole 7 is equipped with the stop collar 6 for being limited to the sliding of the sliding.
The invention also discloses a kind of methods for carrying out supporting using overlength enlarged footing anchor cable 1, comprising the following steps:
S1. scene be provided with multiple test miles sections, in tunnel excavation different time sections, respectively to prestress anchorage cable 1 into
Rock deformation around hole is observed in row tensioning；When S2. showing that 1 tensioning of anchor cable is best according to rock deformation around the hole
Machine.Two-wire small spacing Support System in Soft Rock Tunnels overlength anchor cable 1 reasonable tensioning opportunity reduces double hole constructions and influences each other.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this
In the scope of the claims of invention.
Claims (5)
1. a kind of tunnel overlength enlarged footing anchor cable, which is characterized in that including overlength cable body, be set to the expansion of the cable body inner end
Head, the Pressure-bearing pads for being coated at the cable body, the prestressing force for anchoring with the cable body and utilizing cable body compress the anchor of Pressure-bearing pads
Have, be set to the cable body outer end for carrying out the hydraulic jack of tensioning to cable body；The enlarged footing can along cable body it is radial to
Outreach open form wedgewise structure.
2. overlength enlarged footing anchor cable in tunnel according to claim 1, it is characterised in that: the enlarged footing include center-pole and
Along circumferentially equally distributed multiple two connection rod sets of center-pole, center-pole outer wall is fixed in the inner end of two connection rod set, and outer end can
It slides axially along center-pole, and two connection rod sets is unfolded outward by the sliding.
3. overlength enlarged footing anchor cable in tunnel according to claim 2, it is characterised in that: the center-pole sliding outer cover has cunning
Set, the outer end of two connection rod set is articulated with the sliding sleeve.
4. overlength enlarged footing anchor cable in tunnel according to claim 3, it is characterised in that: the center-pole is equipped with for institute
State the stop collar that the sliding of sliding is limited.
5. a kind of method for carrying out supporting using overlength enlarged footing anchor cable, which comprises the following steps:
S1. scene is provided with multiple test miles sections, in tunnel excavation different time sections, carries out tensioning to prestress anchorage cable respectively
To observe rock deformation around hole；
S2. the anchorage cable stretching best opportunity is obtained according to rock deformation around the hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710867944.2A CN109538265A (en) | 2017-09-22 | 2017-09-22 | Tunnel overlength enlarged footing anchor cable and its method for protecting support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710867944.2A CN109538265A (en) | 2017-09-22 | 2017-09-22 | Tunnel overlength enlarged footing anchor cable and its method for protecting support |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109538265A true CN109538265A (en) | 2019-03-29 |
Family
ID=65830633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710867944.2A Pending CN109538265A (en) | 2017-09-22 | 2017-09-22 | Tunnel overlength enlarged footing anchor cable and its method for protecting support |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109538265A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111456784A (en) * | 2020-04-20 | 2020-07-28 | 北京中矿创新联盟能源环境科学研究院 | Constant-resistance anchor cable structure and anchoring method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101476320A (en) * | 2009-01-21 | 2009-07-08 | 中南大学 | Inflation anchor bar |
| CN102890117A (en) * | 2012-02-15 | 2013-01-23 | 长江水利委员会长江科学院 | Method and device for detecting anchoring quality of long anchor cable |
| CN203559421U (en) * | 2013-10-23 | 2014-04-23 | 江苏金海新能源科技有限公司 | Prestressed double-rhomboid underreamed anchor |
| CN107165661A (en) * | 2017-06-09 | 2017-09-15 | 中铁建大桥工程局集团第五工程有限公司 | A kind of high-ground stress weak surrounding rock large deformation tunnel overlength enlarged footing anchor cable construction method |
-
2017
- 2017-09-22 CN CN201710867944.2A patent/CN109538265A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101476320A (en) * | 2009-01-21 | 2009-07-08 | 中南大学 | Inflation anchor bar |
| CN102890117A (en) * | 2012-02-15 | 2013-01-23 | 长江水利委员会长江科学院 | Method and device for detecting anchoring quality of long anchor cable |
| CN203559421U (en) * | 2013-10-23 | 2014-04-23 | 江苏金海新能源科技有限公司 | Prestressed double-rhomboid underreamed anchor |
| CN107165661A (en) * | 2017-06-09 | 2017-09-15 | 中铁建大桥工程局集团第五工程有限公司 | A kind of high-ground stress weak surrounding rock large deformation tunnel overlength enlarged footing anchor cable construction method |
Non-Patent Citations (1)
| Title |
|---|
| 程良奎等: "岩土锚固工程的若干力学概念问题", 《岩石力学与工程学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111456784A (en) * | 2020-04-20 | 2020-07-28 | 北京中矿创新联盟能源环境科学研究院 | Constant-resistance anchor cable structure and anchoring method |
| CN111456784B (en) * | 2020-04-20 | 2021-01-08 | 北京中矿创新联盟能源环境科学研究院 | Constant-resistance anchor cable structure and anchoring method |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190329 |