CN111140248B - Bias tunnel structure with prestress applied to pilot tunnel and construction method of bias tunnel structure - Google Patents
Bias tunnel structure with prestress applied to pilot tunnel and construction method of bias tunnel structure Download PDFInfo
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- CN111140248B CN111140248B CN202010057586.0A CN202010057586A CN111140248B CN 111140248 B CN111140248 B CN 111140248B CN 202010057586 A CN202010057586 A CN 202010057586A CN 111140248 B CN111140248 B CN 111140248B
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- tunnel
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- side slope
- frame beam
- biased
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- 238000010276 construction Methods 0.000 title claims abstract description 19
- 238000004873 anchoring Methods 0.000 claims abstract description 6
- 238000005553 drilling Methods 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 27
- 239000010959 steel Substances 0.000 claims description 27
- 239000004568 cement Substances 0.000 claims description 6
- 210000002435 tendon Anatomy 0.000 claims description 6
- 239000011150 reinforced concrete Substances 0.000 claims description 5
- 238000007596 consolidation process Methods 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 230000002787 reinforcement Effects 0.000 abstract description 12
- 238000009412 basement excavation Methods 0.000 abstract description 8
- 230000003014 reinforcing effect Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
-
- 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)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a biased tunnel structure with a pre-stress applied to a pilot tunnel and a construction method thereof, wherein the biased tunnel structure comprises a tunnel and a frame beam fixed on the surface of a side slope, and a pre-stress anchor cable is connected between the pilot tunnel and the frame beam of the tunnel, and the construction method comprises the following steps: drilling holes from the surface of the biased low side slope to the pilot tunnel to be excavated; and (3) constructing a frame beam on the surface of the side slope, excavating a pilot tunnel in advance, placing a pre-stressed anchor cable in the drilled hole, anchoring one end of the pre-stressed anchor cable on the frame beam, after pre-stressing the pre-stressed anchor cable, fixedly connecting the other end of the pre-stressed anchor cable on the hole wall of the pilot tunnel, and actively reinforcing the biased low-side slope. The invention applies the prestressed anchor cable between the prior pilot tunnel and the surface of the side slope, can form active reinforcement on the side slope of the mountain, and performs tunnel expansion and excavation construction after the reinforcement is completed so as to ensure the excavation safety and the side slope stability of the whole large-section tunnel.
Description
Technical Field
The invention relates to the technical field of tunnel engineering, in particular to a biased tunnel structure with prestress applied to a pilot tunnel in advance and a construction method thereof.
Background
When a tunnel encounters a bias terrain to enter the tunnel, the tunnel is extremely easy to generate side slope sliding collapse, sinking, cracking, deformation and other diseases, and particularly, the stability of mountain bodies is difficult to ensure for a large-section tunnel, and great difficulty is brought to engineering construction. The conventional bias tunnel reinforcement measures mainly comprise surface grouting, anchoring piles, surface mortar anchor rods, reverse pressure low mountain side ground surfaces and the like, and pre-stress anchor cables can be applied from the ground surfaces, but the anchor cables are applied outside the tunnel excavation outline in the conventional technology, the ground surface reinforcement and the in-hole construction are not directly connected, and the technical scheme for reinforcing the ground surfaces and the in-hole is not adopted, so that the conventional reinforcement measures have the defects of large engineering quantity and unobvious reinforcement effect.
Disclosure of Invention
The invention aims at: aiming at the problems in the prior art, the utility model provides a biasing tunnel structure with prestress applied to a pilot tunnel and a construction method thereof.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The utility model provides a biasing tunnel structure of leading hole application prestressing force, includes tunnel and fixes the frame roof beam at side slope earth's surface, the leading hole of tunnel with be connected with the prestressing force anchor rope between the frame roof beam.
According to the pre-stressed biased tunnel structure for the pilot tunnel, the pre-stressed anchor cable is connected between the pilot tunnel and the surface of the side slope, so that active reinforcement can be formed on the side slope of the mountain, and tunnel excavation construction is performed after the reinforcement is finished, so that the excavation safety and the side slope stability of the whole large-section tunnel are ensured. And the frame beam is firmly fixed on the surface of the side slope by applying prestress, so that the problem of weak ground surface structures in the past is avoided, and the side slope surface can be effectively reinforced.
As a preferred embodiment of the present invention, the pre-stress of the pre-stressed anchor cable is greater than or equal to 5 tons.
As a preferable scheme of the invention, the pre-stressed anchor cable comprises a steel pipe and a tendon positioned in the steel pipe, and cement paste is filled in the steel pipe.
As a preferable scheme of the invention, one end of the pre-stress anchor cable is anchored on the frame beam, and the other end is fixedly connected on the hole wall of the pilot tunnel.
As a preferable scheme of the invention, the frame beam is a reinforced concrete frame structure.
As a preferred embodiment of the present invention, the frame beams are disposed on the biased lower side of the side slope.
The invention also discloses a construction method of the bias tunnel structure with the prestress applied to the pilot tunnel, which comprises the following steps:
step one: drilling holes from the surface of the biased low side slope to the pilot tunnel to be excavated;
Step two: and (3) constructing a frame beam on the surface of the side slope, excavating the pilot tunnel, placing a pre-stress anchor cable in the drilled hole, anchoring one end of the pre-stress anchor cable on the frame beam, and after pre-stressing the pre-stress anchor cable, fixedly connecting the other end of the pre-stress anchor cable on the hole wall of the pilot tunnel to actively strengthen the biased low-side slope.
The pre-stressed anchor cable is applied between the prior pilot tunnel and the surface of the side slope, so that active reinforcement can be formed on the side slope of the mountain, and the tunnel expansion construction is performed after the reinforcement is finished, so that the excavation safety and the side slope stability of the whole large-section tunnel are ensured; the frame beam is firmly fixed on the surface of the side slope by applying prestress, so that the problem of weak surface structure in the past is avoided, and the side slope surface can be effectively reinforced.
As a preferred embodiment of the present invention, the second step includes:
S21: driving a steel flower pipe into the drilling hole to reach the contour of the pilot tunnel, and applying a frame beam on the surface of the slope;
S22: digging the pilot tunnel, exposing the steel flower pipe, and then putting a steel bar bundle into the steel flower pipe and extending out of the slope surface;
S23: and (3) anchoring and connecting one end of the tendon with the frame beam, applying prestress to the tendon, and injecting cement paste into the steel pipe to solidify.
As a preferred embodiment of the present invention, the prestress is greater than or equal to 5 tons.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. The invention applies the prestressed anchor cable between the prior pilot tunnel and the surface of the side slope, can form active reinforcement on the side slope of the mountain, and performs tunnel expansion and excavation construction after the reinforcement is completed so as to ensure the excavation safety and the side slope stability of the whole large-section tunnel.
2. The frame beam is firmly fixed on the side slope ground surface by applying prestress, so that the problem that the ground surface structure is unstable in the past is avoided, and the side slope ground surface can be effectively reinforced.
Drawings
FIG. 1 is a schematic diagram of a pre-stressed biased tunnel structure with pilot holes according to the present invention.
Icon: 1-side slope surface, 2-frame beams, 3-prestressed anchor cables, 4-tunnels and 41-pilot holes.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1, the biased tunnel structure with prestress applied to the pilot tunnel comprises a tunnel 4 and reinforced concrete frame beams 2 fixed on the surface 1 of a side slope, wherein the frame beams 2 are arranged on the low side of the bias voltage of the side slope, a prestress anchor cable 3 is connected between the pilot tunnel 41 of the tunnel 4 and the frame beams 2, one end of the prestress anchor cable 3 is anchored on the frame beams 2, the other end of the prestress anchor cable is fixedly connected on the wall of the pilot tunnel 41, and the prestress of the prestress anchor cable 3 is greater than or equal to 5 tons. The pre-stressed anchor cable 3 comprises a steel pipe and a tendon positioned in the steel pipe, and cement paste is filled in the steel pipe.
Example 2
As shown in fig. 1, a construction method of a biased tunnel structure with prestress applied to a pilot tunnel in advance includes the following steps:
step one: drilling holes from the surface 1 of the biased low side slope into the pilot tunnel 41 to be excavated;
step two: driving a steel flower pipe into the drill hole to the contour of the pilot tunnel 41, and applying a reinforced concrete frame beam 2 on the slope surface 1;
Step three: digging the pilot hole 41, exposing the steel flower pipe, and then putting a tendon into the steel flower pipe and extending out of the slope surface 1;
Step four: and (3) firmly fixing one end of the steel bar bundle and the frame beam 2 by using a high-strength reinforced concrete sealing anchor, and solidifying the cement slurry in the steel pipe after applying prestress which is greater than or equal to 5 tons to the steel bar bundle.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (3)
1. A construction method of a pre-stressed biased tunnel structure of a pilot tunnel, characterized in that the construction method is used for constructing a pre-stressed biased tunnel structure of the pilot tunnel, the biased tunnel structure comprises a tunnel (4) and a frame beam (2) fixed on a slope surface (1), a pre-stressed anchor cable (3) is connected between the pilot tunnel (41) of the tunnel (4) and the frame beam (2), the pre-stressed anchor cable (3) comprises a steel pipe, and a tendon positioned in the steel pipe, and cement paste is filled in the steel pipe, and the construction method comprises the following steps:
Step one: drilling holes from the surface (1) of the biased low side slope into a pilot tunnel (41) to be excavated;
Step two: constructing a frame beam (2) on the surface (1) of the side slope, excavating the pilot hole (41), placing a pre-stress anchor rope (3) in the drilled hole, anchoring one end of the pre-stress anchor rope (3) on the frame beam (2), applying pre-stress to the pre-stress anchor rope (3), and solidifying the other end of the pre-stress anchor rope (3) on the hole wall of the pilot hole (41);
the second step comprises the following steps:
s21: driving a steel pipe into the drilled hole to reach the outline of the pilot tunnel (41), and constructing a frame beam (2) on the slope surface (1);
S22: digging the pilot hole (41), exposing the steel pipe, and then putting a steel bar bundle into the steel pipe and extending out of the slope surface (1);
s23: and (3) anchoring and connecting one end of the steel bar bundle with the frame beam (2), applying prestress to the steel bar bundle, and injecting cement paste into the steel flower pipe for consolidation.
2. A method of constructing a pre-stressed biased tunnel structure as claimed in claim 1, wherein the pre-stress is greater than or equal to 5 tons.
3. The construction method of the pre-stressed biased tunnel construction of the pilot tunnel according to claim 1, wherein the frame beam (2) is a reinforced concrete frame structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010057586.0A CN111140248B (en) | 2020-01-17 | 2020-01-17 | Bias tunnel structure with prestress applied to pilot tunnel and construction method of bias tunnel structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010057586.0A CN111140248B (en) | 2020-01-17 | 2020-01-17 | Bias tunnel structure with prestress applied to pilot tunnel and construction method of bias tunnel structure |
Publications (2)
| Publication Number | Publication Date |
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| CN111140248A CN111140248A (en) | 2020-05-12 |
| CN111140248B true CN111140248B (en) | 2024-05-07 |
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| CN202010057586.0A Active CN111140248B (en) | 2020-01-17 | 2020-01-17 | Bias tunnel structure with prestress applied to pilot tunnel and construction method of bias tunnel structure |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112065469B (en) * | 2020-09-23 | 2022-09-16 | 中铁工程装备集团有限公司 | Underground large-span space structure and construction method thereof |
| CN113605934B (en) * | 2021-07-28 | 2023-03-24 | 中铁十八局集团有限公司 | Reinforced structure for preventing tunnel uphill from slipping down and construction method thereof |
| CN114991807B (en) * | 2022-05-16 | 2023-08-18 | 中国矿业大学(北京) | Tunnel entrance and exit side slope coupling double-compensation construction method |
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