CN217897913U - Small-clear-distance tunnel rock clamping and reinforcing structure suitable for sandy slate stratum - Google Patents
Small-clear-distance tunnel rock clamping and reinforcing structure suitable for sandy slate stratum Download PDFInfo
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- CN217897913U CN217897913U CN202221439607.6U CN202221439607U CN217897913U CN 217897913 U CN217897913 U CN 217897913U CN 202221439607 U CN202221439607 U CN 202221439607U CN 217897913 U CN217897913 U CN 217897913U
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- anchor rod
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- 239000011435 rock Substances 0.000 title claims abstract description 69
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 19
- 239000010454 slate Substances 0.000 title claims abstract description 9
- 238000009412 basement excavation Methods 0.000 claims abstract description 63
- 239000003365 glass fiber Substances 0.000 claims abstract description 23
- 239000002689 soil Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims 1
- 230000002787 reinforcement Effects 0.000 abstract description 11
- 238000010276 construction Methods 0.000 abstract description 10
- 238000007569 slipcasting Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 9
- 241000446313 Lamella Species 0.000 description 4
- 230000006378 damage Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model discloses a little clear distance tunnel presss from both sides rock reinforced structure suitable for sandy slate stratum, this little clear distance tunnel presss from both sides rock reinforced structure, including hole, back row hole, well clamp rock, prestressing force split anchor pole, glass fiber slip casting stock in advance, well clamp rock is located hole in advance with between the back row hole, the prestressing force is in to the one end anchor that pulls the anchor pole on the preliminary bracing of hole in advance, the other end passes well clamp rock anchor is in on the preliminary bracing of back row hole, glass fiber slip casting stock includes permanent reinforcement section and temporary reinforcement section, permanent reinforcement section is located in the well clamp rock, the temporary reinforcement section is located hole in advance with the back row hole is adjacent in press from both sides the rock side bench excavation regional ground internal to can be excavated along with the tunnel excavation. The small clear distance tunnel rock clamping and reinforcing structure has the advantages of good reinforcing effect and safe and reliable construction.
Description
Technical Field
The utility model belongs to the technical field of the tunnel is strutted, especially, relate to a little clean apart from tunnel presss from both sides rock reinforced structure suitable for sandy slate stratum.
Background
When constructing little clear distance tunnel section, the stability of controlling the clamp rock between the hole is the focus of work progress, if the construction is improper, rock mass destruction and tunnel collapse accident such as roof fall in the middle of appearing easily, also can cause the destruction of tunnel preliminary bracing and two linings different degree during the operation, influence the driving safety of tunnel construction safety and operation period, caused serious threat to people's life and property safety.
Patent 2019224285203 discloses a little clear distance tunnel supporting construction suitable for collapsible loess consolidates the middle soil body through the stock of drawing to, improves the stability of the middle rock mass in tunnel. However, due to the special properties of the plate-shaped structure, the bedding and joints of the sandy slate are relatively developed, the disturbance generated in the construction process of the patent easily causes the collapse of the small-clear-distance tunnel rock clamp, the construction risk is extremely high, and the reinforcing effect is limited only by reinforcing the tension anchor rod.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a consolidate effectual, construction safe and reliable's little clean apart from tunnel clamp rock reinforced structure who is applicable to sandy slate stratum.
Therefore, the embodiment of the utility model provides a little clear distance tunnel presss from both sides rock reinforced structure suitable for sandy slate stratum, include hole, backward hole, well clamp rock, prestressing force split anchor, glass fiber slip casting stock in advance, well clamp rock is located hole in advance with between the backward hole, the prestressing force split anchor's one end anchor is in the preliminary bracing in hole in advance, the other end passes well clamp rock anchor is in the preliminary bracing in backward hole, glass fiber slip casting stock includes permanent reinforcement section and temporary reinforcement section, permanent reinforcement section is located in the well clamp rock, the temporary reinforcement section is located hole in advance and backward hole are close to in the adjacent middle clamp rock side step excavation regional ground in hole to can be excavated along with the tunnel excavation.
Specifically, the excavation length of each step excavation area is controlled to be 3m-5m.
Specifically, the front hole and the rear hole are symmetrical about a perpendicular bisector of the prestress opposite-pulling anchor rod.
Specifically, the antecedent tunnel and the consequent tunnel are divided into four areas, namely a left upper middle step excavation area, a left lower step excavation area, a right upper middle step excavation area and a right lower step excavation area according to the excavation sequence.
Compared with the prior art, the utility model discloses at least one embodiment has following beneficial effect: adopt glass fiber slip casting stock to press from both sides the rock in to between the tunnel and consolidate in advance, glass fiber slip casting stock is including the permanent reinforced section that is located the well intermediate lamella rock and the interim reinforced section that is located the tunnel adjacent intermediate lamella side step excavation region ground internal, the interim reinforced section is excavated along with the tunnel excavation, glass fiber slip casting stock can strengthen the stability of the middle intermediate lamella rock of tunnel excavation process, guarantee the security of tunnel excavation, then adopt prestressing force to draw the stock to carry out further reinforcement to the well intermediate lamella rock between the tunnel, the unstable problem of well pillar when having solved little clear distance tunnel construction process, the stability of the rock mass around the tunnel has been improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view illustrating installation of a glass fiber grouting anchor rod according to an embodiment of the present invention;
fig. 2 is a schematic view of the installation of the prestressed counter-pulling anchor rod according to the embodiment of the present invention;
wherein: 1. firstly, forming a hole; 2. backward moving; 3. carrying out middle rock clamping; 4. a prestressed counter-pulling anchor rod; 5. glass fiber grouting anchor rod; 501. a permanent reinforcement section; 502. a temporary reinforcement section; 6. excavating an area on the upper left step and the middle step; 7. excavating an area on a left lower step; 8. excavating an area on the upper right middle step; 9. excavating an area on a right lower step; 10. and (5) primary support.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1 and 2, the small-clear-distance tunnel rock-sandwiched reinforcing structure suitable for the sandy slate stratum comprises a first-going hole 1, a second-going hole 2, a middle-sandwiched rock 3, a prestress opposite-pulling anchor rod 4 and a glass fiber grouting anchor rod 5, wherein the middle-sandwiched rock 3 is located between the first-going hole 1 and the second-going hole 2, one end of the prestress opposite-pulling anchor rod 4 is anchored on an initial support of the first-going hole 1, the other end of the prestress opposite-pulling anchor rod penetrates through the middle-sandwiched rock 3 to be anchored on an initial support 10 of the second-going hole 2, the glass fiber grouting anchor rod 5 comprises a permanent reinforcing section 501 and a temporary reinforcing section 502, the permanent reinforcing section 501 is located in the middle-sandwiched rock 3, and the temporary reinforcing section 502 is located in a rock-soil body of an excavation area of the middle-sandwiched rock 3 side step adjacent to the first-going hole 1 and the second-going hole 2 and can be excavated along with tunnel excavation.
In the embodiment, the glass fiber grouting anchor rod 5 is adopted to pre-reinforce the middle clamp rock 3 between the tunnels, the glass fiber grouting anchor rod 5 comprises a permanent reinforcing section 501 located in the middle clamp rock 3 and a temporary reinforcing section 502 located in the rock body of the excavation region of the side step of the middle clamp rock 3 adjacent to the tunnels, the temporary reinforcing section 502 is excavated along with the tunnel excavation, the glass fiber grouting anchor rod 5 can enhance the stability of the middle clamp rock 3 in the tunnel excavation process, the safety of the tunnel excavation is ensured, then the pre-stress is adopted to further reinforce the middle clamp rock 3 between the tunnels, the problem of instability of the middle rock pillar in the small clear distance tunnel construction process is solved, and the stability of the rock body around the tunnels is improved.
Referring to fig. 1 and 2, in practical application, the preceding tunnel 1 and the following tunnel 2 are excavated by a bench method, and are firstly excavated in an overground middle bench excavation region away from a rock clamping direction, and the preceding tunnel 1 and the following tunnel 2 are divided into four regions, namely an upper left middle bench excavation region 6, a lower left bench excavation region 7, an upper right middle bench excavation region 8 and a lower right bench excavation region 9 according to an excavation sequence.
When each step excavation area of the main tunnel is excavated, firstly, primary support, temporary support and temporary inverted arch are constructed to seal the steps into a ring to improve the stability of the steps, and secondly, a hollow grouting glass fiber anchor rod is constructed in the 3 direction of the middle clamp rock and grouted.
Referring to fig. 2, in some embodiments, in order to improve the reinforcing effect of the middle clamp rock 3, the prestress counter-tension bolts 4 and the glass fiber grouting bolts 5 are alternately distributed in the middle clamp rock 3 from top to bottom at intervals.
In this embodiment, adopt the bench method excavation, and divide the bench block from keeping away from the excavation of pressing from both sides the rock direction, can reduce the number of times of country rock disturbance, avoid causing unfavorable condition such as rock strength reduction, rock structure face is not hard up and excavation profile face local rupture owing to the vibration.
In addition, in order to ensure the self-stability of the surrounding rock, the excavation length range of each step excavation area should be controlled within the range of 3-5m. After the excavation of each step excavation area is finished and preliminary bracing is applied, the prestress counter-pulling anchor rods 4 are immediately applied to the direction of the middle rock pillar, and the left hole and the right hole are symmetrical about the middle vertical line of the prestress counter-pulling anchor rods 4.
An upper left middle step excavation region 6, a lower left step excavation region 7, an upper right middle step excavation region 8 and a lower right step excavation region 9
Referring to fig. 1 and 2, taking excavation of a pilot tunnel 1 (right tunnel) as an example, the construction main steps are as follows: (1) firstly, excavating an upper right middle step excavation region 8 far away from the tunnel rock clamping, applying primary support and temporary support within the range of the upper right middle step excavation region 8 after excavation, and then applying a glass fiber grouting anchor rod 5 in the rock clamping direction and grouting; (2) excavating a right lower step excavation region 9 far away from the tunnel rock clamping, then performing primary support and temporary support within the range of the right lower step excavation region 9, and performing glass fiber grouting anchor rods 5 and grouting in the tunnel rock clamping direction; (3) excavating a left upper middle step excavation region 6 close to the tunnel rock clamp, excavating a glass fiber grouting anchor rod 5 in the range of the left upper middle step excavation region 6, and then performing primary support and temporary support in the range; (4) excavating a left lower step excavation region 7 close to the rock clamp, excavating a glass fiber grouting anchor rod 5 in the range of the left lower step excavation region 7, and then performing primary support in the range; (5) and (5) dismantling the temporary support of the right hole and constructing a secondary lining of the right hole.
The left hole excavation is similar to the right hole excavation, namely excavation is carried out according to a step method, meanwhile excavation is carried out from the direction far away from rock clamping, and in addition, the length of each excavation area of the tunnel is kept to be 3-5m. After the primary support of the left side wall of the right main tunnel of the tunnel is completed, prestress opposite-pulling anchor rods 4 are applied to the middle rock-clamping direction of the small-clear-distance tunnel, and the rock-clamping is further reinforced, so that the aim of keeping the stability of the rock-clamping is finally fulfilled.
Any technical solution disclosed in the present invention is, unless otherwise stated, disclosed a numerical range if it is disclosed, and the disclosed numerical range is a preferred numerical range, and any person skilled in the art should 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 many and cannot be exhaustive, the present invention discloses some numerical values to exemplify the technical solutions of the present invention, and the above-mentioned enumerated numerical values should not be construed as limiting the scope of the present invention.
Meanwhile, if the utility model discloses a disclose or related to mutually fixed connection's spare part or structure, then, except otherwise stated, fixed connection can be understood as: a detachable fixed connection (for example using a bolt or screw connection) can also be 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, the terms used in any technical aspect of the present disclosure as described above for indicating the positional relationship or the shape include the state or the shape similar, analogous or approaching thereto unless otherwise stated. The utility model provides an arbitrary part both can be assembled by a plurality of solitary component parts and form, also can be the solitary part that the integrated into one piece technology was made.
The above examples are merely illustrative of the present invention clearly and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious changes and modifications may be made without departing from the scope of the present invention.
Claims (5)
1. The utility model provides a little clear distance tunnel presss from both sides rock reinforced structure suitable for sandy slate stratum which characterized in that: comprises a leading hole (1), a trailing hole (2), a middle clamp rock (3), a prestress opposite-pulling anchor rod (4) and a glass fiber grouting anchor rod (5); wherein the content of the first and second substances,
the middle clamp rock (3) is positioned between the advanced tunnel (1) and the backward tunnel (2), one end of the prestress counter-pulling anchor rod (4) is anchored on the primary support of the advanced tunnel (1), and the other end of the prestress counter-pulling anchor rod penetrates through the middle clamp rock (3) and is anchored on the primary support of the backward tunnel (2);
the glass fiber grouting anchor rod (5) comprises a permanent reinforcing section (501) and a temporary reinforcing section (502), the permanent reinforcing section (501) is located in the middle clamp rock (3), and the temporary reinforcing section (502) is located in the rock-soil body of the bench excavation region at the side of the front tunnel (1) and the backward tunnel (2) adjacent to the middle clamp rock (3) and can be excavated along with tunnel excavation.
2. The small clear distance tunnel presss from both sides rock reinforced structure of claim 1 characterized in that: the excavation length of each step excavation area is controlled to be 3m-5m.
3. The small clear distance tunnel presss from both sides rock reinforced structure of claim 1 characterized in that: the front hole (1) and the rear hole (2) are symmetrical about a middle vertical line of the prestress opposite-pulling anchor rod (4).
4. The small clear distance tunnel presss from both sides rock reinforced structure of claim 1 characterized in that: the advanced tunnel (1) and the backward tunnel (2) are divided into four regions, namely a left upper middle step excavation region (6), a left lower step excavation region (7), a right upper middle step excavation region (8) and a right lower step excavation region (9) according to an excavation sequence.
5. The small clear distance tunnel presss from both sides rock reinforced structure of claim 1 characterized in that: the prestress opposite-pulling anchor rod (4) and the glass fiber grouting anchor rod (5) are alternately distributed in the middle clamp rock (3) from top to bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221439607.6U CN217897913U (en) | 2022-06-10 | 2022-06-10 | Small-clear-distance tunnel rock clamping and reinforcing structure suitable for sandy slate stratum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221439607.6U CN217897913U (en) | 2022-06-10 | 2022-06-10 | Small-clear-distance tunnel rock clamping and reinforcing structure suitable for sandy slate stratum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217897913U true CN217897913U (en) | 2022-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221439607.6U Expired - Fee Related CN217897913U (en) | 2022-06-10 | 2022-06-10 | Small-clear-distance tunnel rock clamping and reinforcing structure suitable for sandy slate stratum |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217897913U (en) |
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2022
- 2022-06-10 CN CN202221439607.6U patent/CN217897913U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20221125 |