CN112696213B - Tunnel supporting structure and construction method thereof - Google Patents
Tunnel supporting structure and construction method thereof Download PDFInfo
- Publication number
- CN112696213B CN112696213B CN202110068887.8A CN202110068887A CN112696213B CN 112696213 B CN112696213 B CN 112696213B CN 202110068887 A CN202110068887 A CN 202110068887A CN 112696213 B CN112696213 B CN 112696213B
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- Prior art keywords
- bracket
- tunnel
- fixed
- steel frame
- supporting
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- 238000010276 construction Methods 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 45
- 239000010959 steel Substances 0.000 claims abstract description 45
- 230000006835 compression Effects 0.000 claims abstract description 6
- 238000007906 compression Methods 0.000 claims abstract description 6
- 239000011148 porous material Substances 0.000 claims description 8
- 238000005553 drilling Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 5
- 238000009412 basement excavation Methods 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003466 welding Methods 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
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a tunnel supporting structure, which comprises a first supporting part and a second supporting part which are arranged at intervals; the first supporting part comprises a first steel frame, flexible bases are fixed at two ends of the top of the first steel frame, a first bracket is fixed between the two flexible bases, a steel plate is fixed at the top of the first bracket and is in contact with the inner wall of the tunnel, a plurality of bolts are in threaded connection with the first bracket, blind holes which are in one-to-one correspondence with the bolts are formed in the bottom surface of the steel plate, and the tops of the bolts and the blind holes are in mutual compression joint; the second supporting part comprises a second steel frame, a second bracket is fixed to the top of the second steel frame, the second bracket is fixedly connected with the adjacent first bracket through an inclined beam, and the top of the second bracket is fixedly connected with the inner wall of the tunnel through an anchor rod. The invention can improve the defects of the prior art and improve the construction efficiency of supporting operation.
Description
Technical Field
The invention relates to the technical field of tunnel excavation construction, in particular to a tunnel supporting structure and a construction method thereof.
Background
In order to ensure the stability and safety of the working face in the tunnel excavation process, the excavation working face needs to be supported. In order to reduce the influence of the stress deformation of the working face on the supporting structure, the prior art generally adopts a construction mode of twice or multiple supporting to release the stress of the working face. The method has the problems of large construction total amount and long construction time because repeated supporting operation is required for many times.
Disclosure of Invention
The invention aims to provide a tunnel supporting structure and a construction method thereof, which can overcome the defects of the prior art and improve the construction efficiency of supporting operation.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows.
A tunnel supporting structure comprises a first supporting part and a second supporting part which are arranged at intervals; the first supporting part comprises a first steel frame, flexible bases are fixed at two ends of the top of the first steel frame, a first bracket is fixed between the two flexible bases, a steel plate is fixed at the top of the first bracket, the steel plate is in contact with the inner wall of the tunnel, a plurality of bolts are in threaded connection with the first bracket, blind holes in one-to-one correspondence with the bolts are formed in the bottom surface of the steel plate, and the tops of the bolts are in mutual pressure connection with the blind holes; the second supporting part comprises a second steel frame, a second bracket is fixed to the top of the second steel frame, the second bracket is fixedly connected with the adjacent first bracket through an inclined beam, and the top of the second bracket is fixedly connected with the inner wall of the tunnel through an anchor rod.
Preferably, the flexible base comprises a shell, an oil cavity is formed in the bottom of the shell, a piston column is movably inserted into the top of the oil cavity, a base plate is fixed to the top of the piston column, a torsion spring is mounted between the side wall of the base plate and the shell, a conical portion is formed in the bottom of the base plate, an annular flow channel is formed in the top of the shell and communicated with the oil cavity, a piston ring is movably inserted into the top of the annular flow channel and matched with the conical portion in a compression joint mode.
Preferably, an axial grouting hole is formed in the anchor rod.
Preferably, a plurality of pore plates are fixed on the side wall of the anchor rod, and the included angle between each pore plate and the anchor rod is 15 degrees.
Preferably, first screw rods are symmetrically fixed to two sides of the anchor rod, and the first screw rods are fixed to the second bracket through nuts.
The construction method of the tunnel supporting structure comprises the following steps:
fixing a first steel frame at a preset supporting position of a first supporting part, reserving an installation space for a second steel frame, and enabling a steel plate to be in uniform contact with the inner wall of the tunnel through an adjusting bolt for 12 hours;
B. spraying a concrete layer on the supporting surface;
C. after the concrete layer is solidified, drilling holes in the support position of a preset second support part to fix an anchor rod, fixing a second steel frame between two adjacent first steel frames, and then fixing the anchor rod and a second bracket;
D. the second bracket is connected to the adjacent first bracket using a canted beam.
The beneficial effect that adopts above-mentioned technical scheme to bring lies in: the invention arranges two supporting parts at intervals for distributed construction, and the construction amount of each construction is half of the total supporting length, so that the total construction length of two times of construction is one total supporting length, and compared with the prior art, the invention greatly reduces the supporting construction length. After the first supporting part is used for supporting operation, the flexible base is used for effectively buffering the deformation stress of the supporting operation surface, then the second supporting part is used for rigid supporting, and the first supporting part is connected and reinforced, so that the stability of the whole supporting structure is ensured. The annular flow channel and the oil cavity which are communicated with each other in the flexible base can be synchronously supported in the axial direction and the radial direction after the base plate is stressed, so that the supporting stability of the flexible base is improved.
Drawings
Fig. 1 is a schematic view of two supporting parts in a tunnel radial direction according to an embodiment of the present invention.
Fig. 2 is a structural view of a first bracket according to an embodiment of the present invention.
Figure 3 is a block diagram of a flexible base in accordance with one embodiment of the present invention.
Fig. 4 is a block diagram of an anchor in accordance with an embodiment of the present invention.
In the figure: 1. a first steel frame; 2. a flexible base; 3. a first bracket; 4. a steel plate; 5. a bolt; 6. blind holes; 7. a second steel frame; 8. a second bracket; 9. obliquely placing a beam; 10. an anchor rod; 11. a housing; 12. an oil chamber; 13. a piston post; 14. a substrate; 15. a torsion spring; 16. a tapered portion; 17. an annular flow passage; 18. a piston ring; 19. grouting holes; 20. an orifice plate; 21. a first screw; 22. a threaded hole; 23. a threaded sleeve; 24. a second screw; 25. and a nut.
Detailed Description
The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description and the description of the attached drawings, and the specific connection mode of each part adopts the conventional means of mature bolts, rivets, welding, sticking and the like in the prior art, and the detailed description is not repeated.
Referring to fig. 1 to 4, an embodiment of the present invention includes a first supporting part and a second supporting part spaced apart from each other; the first supporting part comprises a first steel frame 1, flexible bases 2 are fixed at two ends of the top of the first steel frame 1, a first bracket 3 is fixed between the two flexible bases 2, a steel plate 4 is fixed at the top of the first bracket 3, the steel plate 4 is in contact with the inner wall of the tunnel, a plurality of bolts 5 are in threaded connection with the first bracket 3, blind holes 6 which are in one-to-one correspondence with the bolts 5 are formed in the bottom surface of the steel plate 4, and the tops of the bolts 5 are in mutual compression joint with the blind holes 6; the second support portion comprises a second steel frame 7, a second bracket 8 is fixed to the top of the second steel frame 7, the second bracket 8 is fixedly connected with the adjacent first bracket 3 through an inclined beam 9, and the top of the second bracket 8 is fixedly connected with the inner wall of the tunnel through an anchor rod 10.
The construction method of the tunnel supporting structure is characterized by comprising the following steps of:
A. fixing a first steel frame 1 at a preset supporting position of a first supporting part, reserving an installation space for a second steel frame 7, and enabling a steel plate 4 to be in uniform contact with the inner wall of the tunnel through an adjusting bolt 5 for 12 hours;
B. spraying a concrete layer on the supporting surface;
C. after the concrete layer is solidified, drilling holes in the support position of a preset second support part to fix an anchor rod 10, fixing a second steel frame 7 between two adjacent first steel frames 1, and then fixing the anchor rod 10 and a second bracket 8;
D. the second bracket 8 is connected to the adjacent first bracket 3 using a canted beam 9.
An axial grout hole 19 is provided in the bolt 10. The side wall of the anchor rod 10 is fixed with a plurality of pore plates 20, and the included angle between the pore plates 20 and the anchor rod 10 is 15 degrees. First screw rods 21 are symmetrically fixed on two sides of the anchor rod 10, and the first screw rods 21 are fixed on the second bracket 8 through nuts 25.
In the step C, the hole punching aperture of the supporting position is in interference fit with the outer edge of the pore plate 20, concrete is synchronously injected into the hole punching position through the grouting hole 19 in the process of embedding the anchor rod 10 into the hole punching position, the anchor rod 10 is rotated in the embedding process of the anchor rod 10, and the concrete is guaranteed to be in full and uniform contact with the pore plate in the hole. When the concrete curing strength reaches 30% of the full curing strength, the anchor rod 10 is fixed with the second bracket 8 through the first screw 21, and local stress deformation generated in the fixing process of the anchor rod 10 can be reduced.
The flexible base 2 comprises a shell 11, an oil cavity 12 is formed in the bottom of the shell 11, a piston column 13 is movably inserted into the top of the oil cavity 12, a base plate 14 is fixed to the top of the piston column 13, a torsion spring 15 is installed between the side wall of the base plate 14 and the shell 11, a conical portion 16 is arranged at the bottom of the base plate 14, an annular flow channel 17 is arranged at the top of the shell 11, the annular flow channel 17 is communicated with the oil cavity 12, a piston ring 18 is movably inserted into the top of the annular flow channel 17, and the piston ring 18 is in compression joint with the conical portion 16.
Threaded holes 22 are symmetrically formed in the edge of the base plate 14, threaded sleeves 23 are hinged below the inclined beams 9, second screws 24 are connected with the threaded sleeves 23 in an internal thread mode, and the top ends of the second screws 24 are connected with the threaded holes 22 in a threaded mode. When the inclined beam 9 is installed, the inclined beam 9 is connected with the substrate 14 through the second screw 24, and the flexible base 2 can be used for performing long-term buffering and absorption on stress deformation of the supporting structure after construction is completed, so that the stability of the supporting structure is improved.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A tunnel supporting construction which characterized in that: the device comprises a first supporting part and a second supporting part which are arranged at intervals; the first supporting part comprises a first steel frame (1), flexible bases (2) are fixed at two ends of the top of the first steel frame (1), a first bracket (3) is fixed between the two flexible bases (2), a steel plate (4) is fixed at the top of the first bracket (3), the steel plate (4) is in contact with the inner wall of the tunnel, a plurality of bolts (5) are connected to the first bracket (3) in a threaded manner, blind holes (6) which correspond to the bolts (5) one by one are formed in the bottom surface of the steel plate (4), and the tops of the bolts (5) are in mutual compression joint with the blind holes (6); the second support part comprises a second steel frame (7), a second bracket (8) is fixed to the top of the second steel frame (7), the second bracket (8) is fixedly connected with the adjacent first bracket (3) through an inclined beam (9), and the top of the second bracket (8) is fixedly connected with the inner wall of the tunnel through an anchor rod (10).
2. The tunnel support structure of claim 1, wherein: the flexible base (2) comprises a shell (11), an oil cavity (12) is formed in the bottom of the shell (11), a piston column (13) is movably inserted into the top of the oil cavity (12), a base plate (14) is fixed to the top of the piston column (13), a torsion spring (15) is installed between the side wall of the base plate (14) and the shell (11), a conical portion (16) is arranged at the bottom of the base plate (14), an annular flow channel (17) is formed in the top of the shell (11), the annular flow channel (17) is communicated with the oil cavity (12), a piston ring (18) is movably inserted into the top of the annular flow channel (17), and the piston ring (18) is in compression joint with the conical portion (16).
3. The tunnel support structure of claim 1, wherein: an axial grouting hole (19) is formed in the anchor rod (10).
4. The tunnel support structure of claim 3, wherein: a plurality of pore plates (20) are fixed on the side wall of the anchor rod (10), and the included angle between the pore plates (20) and the anchor rod (10) is 15 degrees.
5. The tunnel support structure according to claim 4, wherein: the anchor rod (10) is symmetrically fixed with first screw rods (21) on two sides, and the first screw rods (21) are fixed on the second bracket (8) through nuts (25).
6. A construction method of a tunnel supporting structure according to any one of claims 1 to 5, comprising the steps of:
A. fixing a first steel frame (1) at a preset supporting position of a first supporting part, reserving an installation space for a second steel frame (7), and enabling a steel plate (4) to be in uniform contact with the inner wall of the tunnel through an adjusting bolt (5) for 12 hours;
B. spraying a concrete layer on the supporting surface;
C. after the concrete layer is solidified, drilling holes in the support positions of the preset second support parts to fix anchor rods (10), fixing a second steel frame (7) between two adjacent first steel frames (1), and fixing the anchor rods (10) and a second bracket (8);
D. the second bracket (8) is connected to the adjacent first bracket (3) using a canted beam (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110068887.8A CN112696213B (en) | 2021-01-19 | 2021-01-19 | Tunnel supporting structure and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110068887.8A CN112696213B (en) | 2021-01-19 | 2021-01-19 | Tunnel supporting structure and construction method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112696213A CN112696213A (en) | 2021-04-23 |
| CN112696213B true CN112696213B (en) | 2022-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110068887.8A Active CN112696213B (en) | 2021-01-19 | 2021-01-19 | Tunnel supporting structure and construction method thereof |
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| Country | Link |
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| CN (1) | CN112696213B (en) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204691789U (en) * | 2015-04-15 | 2015-10-07 | 山西省交通科学研究院 | A kind of adjustable tunnel support structure |
| CN104948207B (en) * | 2015-05-27 | 2017-04-05 | 山东大学 | For improving the device of swell-shrink characteristic soil property large cross-section tunnel steel arch-shelf load-carrying properties |
| KR101763880B1 (en) * | 2016-06-27 | 2017-08-01 | 정혁수 | Lattice girder for supporting tunnel |
| CN107059634B (en) * | 2017-04-26 | 2019-05-17 | 高军 | A kind of dedicated gib equipment of tunnel bridge |
| CN108374683B (en) * | 2018-05-28 | 2024-06-28 | 中铁工程装备集团有限公司 | Supporting device for main tunnel |
| CN109268033A (en) * | 2018-07-31 | 2019-01-25 | 杭州江润科技有限公司 | Pushing out ring arch reinforces Large Deformation Support and its construction method in soft rock tunnel regularization |
| CN211524846U (en) * | 2019-09-26 | 2020-09-18 | 浙江省隧道工程集团有限公司 | Tunnel engineering steel bow member fixing device |
| CN111058873B (en) * | 2020-01-15 | 2021-07-13 | 中国石油大学(华东) | Primary support part supporting device and method for weak surrounding rock large-section tunnel |
| CN212202081U (en) * | 2020-05-26 | 2020-12-22 | 兰州交通大学 | Tunnel engineering steel bow member fixing device |
| CN112228134A (en) * | 2020-10-20 | 2021-01-15 | 瞿启芳 | Tunnel broken area temporary combination supporting device |
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2021
- 2021-01-19 CN CN202110068887.8A patent/CN112696213B/en active Active
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| Publication number | Publication date |
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| CN112696213A (en) | 2021-04-23 |
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