CN112065480A - Tunnel face recyclable advanced grouting anchor cable and application method thereof - Google Patents
Tunnel face recyclable advanced grouting anchor cable and application method thereof Download PDFInfo
- Publication number
- CN112065480A CN112065480A CN202010850182.7A CN202010850182A CN112065480A CN 112065480 A CN112065480 A CN 112065480A CN 202010850182 A CN202010850182 A CN 202010850182A CN 112065480 A CN112065480 A CN 112065480A
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- CN
- China
- Prior art keywords
- anchor cable
- tunnel face
- grouting
- face
- recyclable
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- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 57
- 239000010959 steel Substances 0.000 claims abstract description 57
- 238000009412 basement excavation Methods 0.000 claims abstract description 16
- 239000004570 mortar (masonry) Substances 0.000 claims description 13
- 238000004873 anchoring Methods 0.000 claims description 12
- 239000011435 rock Substances 0.000 claims description 9
- 238000005553 drilling Methods 0.000 claims description 7
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 238000005422 blasting Methods 0.000 claims description 3
- 238000005345 coagulation Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 7
- 238000007569 slipcasting Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011152 fibreglass Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- 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
- E21D21/0046—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts formed by a plurality of elements arranged longitudinally
-
- 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
- E21D21/006—Anchoring-bolts made of cables or wires
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)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention provides a tunnel face recyclable advanced grouting anchor cable and an application method thereof. When the multi-section steel strand is matched with the grouting pipe and applied to tunnel face support, the multiple sections of the anchor cable body are continuously exposed out of the face surface along with the tunnel excavation, the anchor cable bodies at all the sections are mutually connected through the connecting device, so that the anchor cable bodies can be recycled section by section while the tunnel excavation is carried out, the recycled anchor cable bodies can be reassembled and then used for subsequent face support, the face anchor cable support cost is greatly reduced, and the construction progress is accelerated.
Description
Technical Field
The invention relates to a tunnel face recyclable advanced grouting anchor cable and an application method thereof.
Background
In the tunnel construction process, the tunnel face is easy to deform and destabilize, and the advanced anchor rod is a common support means. However, as the length of the anchor is much greater than the length of a single excavation, the face anchor is cut off for each excavation as the tunnel face advances. However, traditional reinforcing bar stock is difficult to be cut off, seriously hinders the construction progress, and the stock after cutting off all falls into building rubbish moreover, is difficult to recycle, and construction cost is high. The glass fiber reinforced plastic anchor rod is easy to cut off due to the brittleness of the glass fiber reinforced plastic anchor rod, but the shear strength is low, and when the joint cracks of the tunnel face and surrounding rock in front of the tunnel face develop, the maintenance of the stability of the tunnel face is not facilitated.
Disclosure of Invention
The invention improves the problems, namely the invention aims to solve the technical problems that the prior advanced anchor rod in the tunnel construction process is a common support means, so that the tunnel face is advanced forwards, the construction cost of cutting off the anchor rod on the tunnel face is high in each excavation, and in addition, the stability of the tunnel face is not facilitated to maintain when the crack of the surrounding rock joint develops.
The specific embodiment of the invention is as follows: but tunnel face cyclic utilization formula grout anchor rope in advance includes the anchor rope body that forms by multistage steel strand wires fixed connection, anchor rope body side ligature has the slip casting pipe, slip casting pipe and anchor rope body stretch into the anchor rope of tunnel face and strut drilling and the periphery packing has the anchor mortar layer of being injected into by the slip casting pipe.
Furthermore, a sleeve connecting bolt with the inner diameter matched with the outer diameter of the steel strand is sleeved outside the joint of the adjacent steel strands, a connecting sleeve connected to the outer portion of the sleeve connecting bolt through threads is arranged at the connecting end of the adjacent steel strands, the diameter of the inner wall of the connecting sleeve gradually increases from the inner side to the outer side, a gasket is sleeved between the inner wall of the connecting sleeve and the steel strand, and anti-skidding threads are arranged inside the gasket.
Furthermore, a connecting steel pipe with the inner diameter matched with the outer diameter of the steel strand is sleeved outside the joint of the adjacent steel strands, a locking bolt in threaded connection along the radial direction penetrates through the side part of the connecting steel pipe, and one end of the locking bolt extending into the connecting steel pipe presses the end part of the adjacent connected steel strand.
Further, the grouting pipe is a plastic hose.
Furthermore, an anchor cable tray is sleeved outside the outer side of the anchor cable body on the tunnel face, and a lock sleeved outside the anchor cable tray is fixed on the outer side of the tray.
The invention also comprises an application method of the tunnel face recyclable advanced grouting anchor cable, which utilizes the tunnel face recyclable advanced grouting anchor cable and comprises the following specific steps:
(1) determining the length of each section of steel strand forming the anchor cable body according to the single excavation length of the tunnel face, then determining the number of sections of the steel strand contained in each anchor cable body according to the design support length of the anchor cable on the tunnel face, and connecting the sections of the steel strands into the anchor cable body by using the connection mode of the first embodiment or the second embodiment;
(2) after the anchor cable supporting position is determined on the face, drilling holes by using a drilling machine, and removing rock debris in the holes;
(3) inserting the anchor cable body bound with the grouting pipe into the anchor hole until the designed depth is reached;
(4) starting a grouting pump, and injecting quick-setting anchoring mortar into the anchor hole through a grouting pipe to form an anchoring mortar layer;
(5) after the rapid-coagulation type anchoring mortar is solidified, installing an anchor cable tray and an anchor cable lock, and enabling the anchor cable to start providing support resistance to maintain the tunnel face stability;
(6) reinforcing rock mass around the tunnel under the condition that the tunnel face is stable, and then removing the anchor cable tray and the anchor cable lock when the tunnel face is pushed forward for the next cycle, and then performing mechanical or blasting excavation;
(7) after the tunnel face excavation is completed, removing a section of steel stranded wire and a connecting device of the anchor cable body exposed outside the tunnel face, recovering and storing, and installing an anchor cable tray and an anchor cable lock on the rest anchor cable body;
(8) repeating the steps (6) and (7) until all anchor cable bodies in the face are dug out, and reassembling the anchor cable bodies which are recovered and stored and the connecting device for the face support again.
Compared with the prior art, the invention has the following beneficial effects: when the multi-section steel strand is matched with the grouting pipe and applied to tunnel face support, the multiple sections of the anchor cable body are continuously exposed out of the face surface along with the tunnel excavation, the anchor cable bodies at all the sections are mutually connected through the connecting device, so that the anchor cable bodies can be recycled section by section while the tunnel excavation is carried out, the recycled anchor cable bodies can be reassembled and then used for subsequent face support, the face anchor cable support cost is greatly reduced, and the construction progress is accelerated.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic view of a partial structure of a steel strand connection according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a second embodiment of the present invention.
FIG. 4 is a schematic structural view of a hollow cylindrical steel pipe and a locking bolt at a joint of a second steel strand according to an embodiment of the invention.
In the figure: 1-anchoring a mortar layer; 2-anchor cable trays; 3-anchor cable locks; 4-steel strand wires; 5-connecting the sleeve; 6-a gasket; 7-a sleeve connection bolt; 8-surrounding rock; 9-hollow cylindrical steel tube; 10-locking the bolt.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1-4, the tunnel face recyclable advanced grouting anchor cable comprises an anchor cable body formed by fixedly connecting a plurality of sections of steel strands 4, grouting pipes are bound to the side of the anchor cable body, the grouting pipes and the anchor cable body extend into anchor cable support drill holes on the tunnel face, and an anchoring mortar layer 1 injected by the grouting pipes is filled in the periphery of the grouting pipes.
In this embodiment, a sleeve connecting bolt 7 with an inner diameter matched with the outer diameter of the steel strand is sleeved outside the joint of the adjacent steel strands, a connecting sleeve 5 in threaded connection with the outside of the sleeve connecting bolt is arranged at the connecting end of the adjacent steel strands, the diameter of the inner wall of the connecting sleeve gradually increases from the inner side to the outer side, a gasket 6 is sleeved between the inner wall of the connecting sleeve and the steel strand, and an anti-skid thread is arranged inside the gasket 6.
When the connecting sleeve 5 outside the two steel strands 4 is connected to the sleeve connecting bolt 7, the inner side of the conical hole with the diameter gradually increasing towards the outer side presses the gasket 6 to extrude the adjacent steel strands, so that the condition that the two adjacent steel strands are connected together through the sleeve connecting bolt 7 is met.
In this embodiment, the slip casting pipe is a plastic hose, an anchor cable tray 2 is sleeved outside the anchor cable body located on the tunnel face, and a lock 3 sleeved outside the anchor cable tray is fixed outside the tray.
In the second embodiment, the difference from embodiment 1 is that a connecting hollow cylindrical steel tube 9 having an inner diameter corresponding to the outer diameter of the steel strand is sleeved outside the joint between the adjacent steel strands, a locking bolt 10 threaded in the radial direction penetrates through the side of the hollow cylindrical steel tube 9, the locking bolt extends into one end of the connecting steel tube to press the end of the adjacent steel strand, and the hollow cylindrical steel tube 9 entirely covers the joint between the adjacent steel strands.
The anchor cable body application method adopted by the embodiment comprises the following steps:
(1) determining the length of each section of steel strand 4 forming the anchor cable body according to the single excavation length of the tunnel face, then determining the number of sections of the steel strand 4 contained in each anchor cable body according to the design support length of the anchor cable on the tunnel face, and connecting each section of the steel strand into the anchor cable body by using the connection mode of the first embodiment or the second embodiment;
(2) after the anchor cable supporting position is determined on the face, drilling holes by using a drilling machine, and removing rock debris in the holes;
(3) inserting the anchor cable body bound with the grouting pipe into the anchor hole until the designed depth is reached;
(4) starting a grouting pump, and injecting quick-setting anchoring mortar into the anchor hole through a grouting pipe to form an anchoring mortar layer;
(5) after the rapid-coagulation type anchoring mortar is solidified, installing an anchor cable tray and an anchor cable lock, and enabling the anchor cable to start providing support resistance to maintain the tunnel face stability;
(6) reinforcing rock mass around the tunnel under the condition that the tunnel face is stable, and then removing the anchor cable tray and the anchor cable lock when the tunnel face is pushed forward for the next cycle, and then performing mechanical or blasting excavation;
(7) after the tunnel face excavation is completed, removing a section of steel stranded wire and a connecting device of the anchor cable body exposed outside the tunnel face, recovering and storing, and installing an anchor cable tray and an anchor cable lock on the rest anchor cable body;
(8) repeating the steps (6) and (7) until all anchor cable bodies in the face are dug out, and reassembling the anchor cable bodies which are recovered and stored and the connecting device for the face support again.
Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.
If the invention discloses or relates to parts or structures which are fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (6)
1. The tunnel face recyclable type advanced grouting anchor cable is characterized by comprising an anchor cable body formed by fixedly connecting multiple sections of steel strands, grouting pipes are bound to the side of the anchor cable body, the grouting pipes and the anchor cable body extend into anchor cable support drill holes in the tunnel face, and an anchoring mortar layer injected by the grouting pipes is filled in the periphery of the anchor cable support drill holes.
2. The tunnel face recyclable advanced grouting anchor cable as claimed in claim 1, wherein a sleeve connecting bolt with an inner diameter matched with the outer diameter of the steel strand is sleeved outside the joint of the adjacent steel strands, a connecting sleeve which is in threaded connection with the outside of the sleeve connecting bolt is arranged at the connecting end part of the adjacent steel strands, the diameter of the inner wall of the connecting sleeve gradually increases from inside to outside, a gasket is sleeved between the inner wall of the connecting sleeve and the steel strand, and anti-skid threads are arranged inside the gasket.
3. The tunnel face recyclable advanced grouting anchor cable as claimed in claim 1, wherein a connecting steel pipe with an inner diameter corresponding to the outer diameter of the steel strands is sleeved outside the joint of the adjacent steel strands, a locking bolt in threaded connection along the radial direction penetrates through the side part of the connecting steel pipe, and one end of the locking bolt extending into the connecting steel pipe presses the end part of the adjacent steel strand.
4. The tunnel face recyclable advanced grouting anchor cable as claimed in claim 1, 2 or 3, wherein the grouting pipe is a plastic hose.
5. The tunnel face recyclable advanced grouting anchor cable of claim 1, wherein an anchor cable tray is sleeved outside the anchor cable body on the outer side of the tunnel face, and a lock sleeved outside the anchor cable tray is fixed on the outer side of the tray.
6. A tunnel face recyclable advanced grouting anchor cable application method is characterized in that the tunnel face recyclable advanced grouting anchor cable as claimed in claim 2 or 3 is utilized, and the method comprises the following specific steps:
(1) determining the length of each section of steel strand forming the anchor cable body according to the single excavation length of the tunnel face, then determining the number of sections of the steel strand contained in each anchor cable body according to the design support length of the anchor cable on the tunnel face, and connecting the sections of the steel strands into the anchor cable body by using the connection mode of the first embodiment or the second embodiment;
(2) after the anchor cable supporting position is determined on the face, drilling holes by using a drilling machine, and removing rock debris in the holes;
(3) inserting the anchor cable body bound with the grouting pipe into the anchor hole until the designed depth is reached;
(4) starting a grouting pump, and injecting quick-setting anchoring mortar into the anchor hole through a grouting pipe to form an anchoring mortar layer;
(5) after the rapid-coagulation type anchoring mortar is solidified, installing an anchor cable tray and an anchor cable lock, and enabling the anchor cable to start providing support resistance to maintain the tunnel face stability;
(6) reinforcing rock mass around the tunnel under the condition that the tunnel face is stable, and then removing the anchor cable tray and the anchor cable lock when the tunnel face is pushed forward for the next cycle, and then performing mechanical or blasting excavation;
(7) after the tunnel face excavation is completed, removing a section of steel stranded wire and a connecting device of the anchor cable body exposed outside the tunnel face, recovering and storing, and installing an anchor cable tray and an anchor cable lock on the rest anchor cable body;
(8) repeating the steps (6) and (7) until all anchor cable bodies in the face are dug out, and reassembling the anchor cable bodies which are recovered and stored and the connecting device for the face support again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010850182.7A CN112065480B (en) | 2020-08-21 | 2020-08-21 | Recyclable advanced grouting anchor cable for tunnel face and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010850182.7A CN112065480B (en) | 2020-08-21 | 2020-08-21 | Recyclable advanced grouting anchor cable for tunnel face and application method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112065480A true CN112065480A (en) | 2020-12-11 |
| CN112065480B CN112065480B (en) | 2024-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010850182.7A Active CN112065480B (en) | 2020-08-21 | 2020-08-21 | Recyclable advanced grouting anchor cable for tunnel face and application method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201236718Y (en) * | 2008-08-08 | 2009-05-13 | 中国矿业大学 | Inner slip-casting anchor cable |
| CN104061009A (en) * | 2014-05-16 | 2014-09-24 | 山东科技大学 | Multi-section expansion yielding prestressed grouting anchor cable and application method thereof |
| CN205013011U (en) * | 2015-09-28 | 2016-02-03 | 中铁二十局集团有限公司 | Pyroclastic flow stratum tunnel advance support structure |
| WO2019000907A1 (en) * | 2017-06-28 | 2019-01-03 | 山东科技大学 | Large-deformation constant-resistance anchor bolt and anchor cable grouting support, and roadway quantitative support method |
| CN212837889U (en) * | 2020-08-21 | 2021-03-30 | 福州大学 | Tunnel face cyclic utilization type advanced grouting anchor cable |
-
2020
- 2020-08-21 CN CN202010850182.7A patent/CN112065480B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201236718Y (en) * | 2008-08-08 | 2009-05-13 | 中国矿业大学 | Inner slip-casting anchor cable |
| CN104061009A (en) * | 2014-05-16 | 2014-09-24 | 山东科技大学 | Multi-section expansion yielding prestressed grouting anchor cable and application method thereof |
| CN205013011U (en) * | 2015-09-28 | 2016-02-03 | 中铁二十局集团有限公司 | Pyroclastic flow stratum tunnel advance support structure |
| WO2019000907A1 (en) * | 2017-06-28 | 2019-01-03 | 山东科技大学 | Large-deformation constant-resistance anchor bolt and anchor cable grouting support, and roadway quantitative support method |
| CN212837889U (en) * | 2020-08-21 | 2021-03-30 | 福州大学 | Tunnel face cyclic utilization type advanced grouting anchor cable |
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| Publication number | Publication date |
|---|---|
| CN112065480B (en) | 2024-06-14 |
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