CN110397453B - Assembly type advanced stress release pilot tunnel supporting structure capable of being recycled and construction method - Google Patents
Assembly type advanced stress release pilot tunnel supporting structure capable of being recycled and construction method Download PDFInfo
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- CN110397453B CN110397453B CN201910653497.XA CN201910653497A CN110397453B CN 110397453 B CN110397453 B CN 110397453B CN 201910653497 A CN201910653497 A CN 201910653497A CN 110397453 B CN110397453 B CN 110397453B
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- steel plate
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- 238000010276 construction Methods 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 156
- 239000010959 steel Substances 0.000 claims abstract description 156
- 239000003365 glass fiber Substances 0.000 claims abstract description 18
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 5
- 239000011435 rock Substances 0.000 claims description 14
- 230000009471 action Effects 0.000 claims description 9
- 238000009412 basement excavation Methods 0.000 claims description 6
- 238000004080 punching Methods 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 4
- 238000004904 shortening Methods 0.000 claims description 3
- 238000004873 anchoring Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000009466 transformation Effects 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
- 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
-
- 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
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/155—Laggings made of strips, slats, slabs or sheet piles
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
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)
- Architecture (AREA)
- Civil Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention relates to a cyclic assembled advanced stress release pilot tunnel supporting structure and a construction method thereof, wherein a corrugated steel plate ring is arranged in the inner ring direction of an advanced pilot tunnel, and a long glass fiber anchor rod is arranged from the corrugated steel plate ring to the rear side of the corrugated steel plate ring; the corrugated steel plate ring is internally provided with a circumferential steel frame, and a compressible steel pipe is arranged between the steel frame and the corrugated steel plate ring. According to the method, the pilot tunnel is constructed in advance of the main tunnel, the pilot tunnel and the main tunnel are pushed in parallel, and the construction progress is ensured; the assembled combined structure composed of the corrugated steel plates and the steel frames is adopted, the corrugated steel plates and the steel frames are provided with telescopic connectors, and a compressible steel pipe is arranged between the steel and the corrugated steel plates.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a recycled assembled advanced stress release pilot tunnel supporting structure and a construction method.
Background
With the improvement of road grade, the traffic network is further perfected, the long, large and deep buried tunnels are increasingly increased, the geological conditions are increasingly complicated to pass through, the high stress phenomenon is more and more prominent, particularly, the soft rock tunnel is subjected to large deformation, the deformation is difficult to control completely, the support structure is limited and cracked, the support structure is frequently detached and replaced, and the engineering progress and the engineering quality are severely restricted.
The traditional passive and rigid support system mainly used for hard resistance cannot effectively release plastic energy stored in surrounding rock, the technical problems of quick pressing, large pressure and uncontrollable deformation can occur in the excavation process, particularly, a very high ground stress section can be formed by replacing an arch for multiple times, the construction progress is blocked, the support structure can be crushed after a few years, the engineering cost is increased sharply, and the normal use of a tunnel is seriously affected.
Therefore, how to release plastic energy in the rock stratum, control the development of a surrounding rock loosening area and avoid the occurrence of the loosening area, ensure the safety of the supporting structure in the construction stage, not to detach or detach less, ensure the safety, the rapidness and the controllability of main hole excavation, and realize the long-term stability of the lining structure and control the engineering investment to be considered.
Disclosure of Invention
The invention aims to provide a cyclic-use assembly type advanced stress release pilot tunnel supporting structure and a construction method, which can release surrounding rock plastic property, can be pressed, are convenient to mount and dismount, can be repeatedly used, are beneficial to reducing the large-section excavation risk of a main tunnel, not only avoid the problem that a rigid material does not have large deformation characteristics, but also realize the controllable requirement of multistage pressing and deformation, and also decompose surrounding rock pressure acting on the main tunnel in advance, thereby creating conditions for the subsequent large-section safety construction of the main tunnel.
The technical scheme adopted by the invention is as follows:
assembly type advanced stress release pilot tunnel supporting construction of cyclic utilization, its characterized in that:
arranging a corrugated steel plate ring in the inner circumferential direction of the advanced pilot tunnel, and punching a long glass fiber anchor rod from the corrugated steel plate ring to the rear of the corrugated steel plate ring;
the corrugated steel plate ring is internally provided with a circumferential steel frame, and a compressible steel pipe is arranged between the steel frame and the corrugated steel plate ring.
The corrugated steel plate ring is formed by assembling a plurality of circular arc corrugated steel plates, the edges of the corrugated steel plates are provided with round bolt holes or strip-shaped chute holes, and the edges of two adjacent corrugated steel plates are stacked to enable the bolt holes to be aligned with the chute holes and fixed through bolts.
The corrugated steel plate is provided with an anchor rod hole for punching a long glass fiber anchor rod.
The steel frame is divided into several sections in the circumferential direction, and the sections are connected into a ring through compressible joints.
The compressible joint comprises two sections of U-shaped steel, one end part of the U-shaped steel is placed in the U-shaped groove of the other end part of the U-shaped steel, the outer annular sleeve clamp of the overlapped part is overlapped, the two sections of U-shaped steel slide to be overlapped up and down under the action of external pressure, and the circumferential deformation is realized by shortening the circumference of the steel frame.
The U-shaped steel is connected with the steel frame through the end plates and the bolts.
The compressible steel pipes are radially arranged along the outer cambered surface of the steel frame at intervals, one end of each steel pipe is welded to the outer edge of the steel frame, and the other end of each steel pipe directly abuts against the inner edge of the corrugated steel plate.
The compressible steel tube is flattened in the radial direction under the action of external force, so that the support system is deformed in the radial direction.
The construction method of the cyclic assembly type advanced stress release pilot tunnel supporting structure is characterized by comprising the following steps of:
the method comprises the following steps:
the advanced pilot tunnel is excavated before the main tunnel, and assembled corrugated steel plates, long glass fiber anchor rods and profile steel frames are timely applied after the main tunnel is excavated to form a combined type pressure-allowed supporting structure;
when the deformation rate of the supporting structure is too high or the deformation amount is too large, encrypting the steel frame, and lengthening the glass fiber anchor rod, and controlling the deformation within an acceptable range;
the advanced pilot tunnel and the main tunnel are excavated and pushed in parallel, when the advanced pilot tunnel advances for 40m, the main tunnel face is excavated, a support is applied, and the corrugated steel plate and the steel frame of the advanced pilot tunnel are removed;
repairing the corrugated steel plate and the steel frame with local damage deformation, re-welding the compressible steel pipe on the steel frame, and continuing to use in subsequent circulation.
The invention has the following advantages:
1. according to the invention, the pilot tunnel is constructed in advance of the main tunnel, the pilot tunnel and the main tunnel are pushed in parallel, and the construction progress is ensured.
2. The assembly type combined structure consisting of the corrugated steel plate and the steel frame is adopted, and the corrugated steel plate and the steel frame are respectively provided with a telescopic joint so as to realize circumferential compression deformation; and a compressible steel pipe is arranged between the profile steel and the corrugated steel plate, so that radial compression deformation is realized. The supporting structure can realize multistage yielding deformation, realizes yielding and resisting, can release stress in advance, decomposes surrounding rock pressure acting on a main hole, creates conditions for the safe excavation of a large section of the main hole, and avoids the problem of frequent arch disassembly and replacement in construction.
3. The full-length resin anchoring glass fiber long anchor rod is adopted, the main hole of the surrounding rock is reinforced by applying prestress, the surface pressure is transferred to the deep part of the surrounding rock, and the self-bearing capacity of the deep surrounding rock is fully utilized.
4. The structure is convenient to install and detach, can be recycled, and reduces the engineering cost.
Drawings
Fig. 1 is a schematic diagram of the structure of the present invention.
Fig. 2 is a schematic view of the circumferential connection of corrugated steel plates.
Fig. 3 is a schematic view of a steel section frame.
Fig. 4 is a schematic view of a retractable joint of a steel section frame.
Fig. 5 is a schematic diagram of a compressible steel pipe connection.
Fig. 6 is a construction flow chart of the present invention.
The device comprises a main hole 1, an advanced pilot hole 2, a corrugated steel plate 3, a long glass fiber anchor rod 4, a steel frame 5, a compressible steel pipe 6, a compressible joint 7, a slotted hole 8, a bolt 9, a bolt hole 10, an anchor rod hole 11, a U-shaped steel 12, a clamp 13 and a welding seam 14.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The invention relates to a cyclic assembled advanced stress release pilot tunnel supporting structure, wherein a corrugated steel plate ring is arranged in the inner ring direction of an advanced pilot tunnel, and a long glass fiber anchor rod 4 is arranged from the corrugated steel plate ring to the rear of the corrugated steel plate ring; the corrugated steel plate ring is internally provided with a circumferential steel frame 5, and a compressible steel pipe 6 is arranged between the steel frame 5 and the corrugated steel plate ring.
The corrugated steel plate ring is formed by assembling a plurality of circular arc corrugated steel plates 3, the edges of the corrugated steel plates 3 are provided with round bolt holes 10 or strip-shaped chute holes 8, and the edges of two adjacent corrugated steel plates 3 are stacked to enable the bolt holes 10 to be aligned with the chute holes 8 and fixed through bolts 9. The corrugated steel plate 3 is provided with an anchor rod hole 11 for punching the long glass fiber anchor rod 4, holes are drilled along the reserved anchor rod hole, resin cartridges are filled after holes are formed, the glass fiber long anchor rod is arranged, prestress is applied, and the backing plate is fastened.
The steel frame 5 is divided into a plurality of sections in the circumferential direction, and the sections are connected into a ring through compressible joints 7. The compressible joint 7 adopts a resistance type retractable structure and comprises two sections of U-shaped steel 12, one end part of the U-shaped steel is placed in a U-shaped groove of the other end part, the outer ring sleeve clamp 13 of the stacked part is overlapped, the two sections of U-shaped steel 12 slide to be overlapped up and down under the action of external pressure, and the circumferential deformation is realized by shortening the circumference of the steel frame. The U-shaped steel 12 is connected with the steel frame 5 through end plates and bolts.
The compressible steel pipes 6 are radially arranged along the outer arc surface of the steel section frame 5 at intervals, one end of each steel pipe 6 is welded to the outer edge of the steel section frame 5, and the other end of each steel pipe is directly propped against the inner edge of the corrugated steel plate 3.
The compressible steel tube 6 is allowed to be compressed, the corrugated steel plate 3 is flattened under the action of surrounding rock pressure, the diameter of the steel tube is matched with the space to be compressed, and the compressible steel tube 6 is flattened along the radial direction under the action of external force, so that the support system is deformed along the radial direction.
The corrugated steel plate 3, the long glass fiber anchor rod 4 and the steel section frame 5 are stressed together, so that the surrounding rock is in a three-way stressed state, the surface layer support and the deep anchoring are combined, and the overall stability of the surrounding rock is improved.
The construction method of the cyclic assembly type advanced stress relief pilot tunnel supporting structure comprises the steps of excavating an advanced pilot tunnel 2 in the main tunnel 1, wherein the pilot tunnel is arranged in the section of the main tunnel 1 and is generally arranged in the middle. The advanced pilot tunnel 2 adopts an assembled yielding support structure and comprises a support structure formed by an assembled corrugated steel plate 3, a steel frame 5 and a long glass fiber anchor rod 4, wherein the corrugated steel plate 3 and the steel frame 5 adopt a resistance type slidable structure, and the long anchor rod adopts full-length resin for anchoring and prestressing force is applied. The method specifically comprises the following steps:
the advanced pilot tunnel 2 is excavated before the main tunnel 1, and an assembled corrugated steel plate 3, a long glass fiber anchor rod 4 and a profile steel frame 5 are timely applied after the excavation to form a combined type pressure-allowed supporting structure;
when the deformation rate of the supporting structure is too high or the deformation amount is too large, the steel frame 5 is encrypted, the long glass fiber anchor rod 4 is lengthened, and the deformation is controlled within an acceptable range;
the advanced pilot tunnel 2 and the main tunnel 1 are excavated and pushed in parallel, when the advanced pilot tunnel 2 advances by 40m, the tunnel face of the main tunnel 1 is excavated, a support is applied, and the advanced pilot tunnel corrugated steel plate 3 and the steel section steel frame 4 are removed;
repairing the corrugated steel plate 3 and the steel frame 5 with local damage deformation, and re-welding the compressible steel tube 6 on the steel frame 5 for continuous use in subsequent circulation.
The content of the invention is not limited to the examples listed, and any equivalent transformation to the technical solution of the invention that a person skilled in the art can take on by reading the description of the invention is covered by the claims of the invention.
Claims (2)
1. Assembly type advanced stress release pilot tunnel supporting construction of cyclic utilization, its characterized in that:
arranging a corrugated steel plate ring in the inner circumferential direction of the advanced pilot tunnel, and punching a long glass fiber anchor rod (4) from the corrugated steel plate ring to the rear of the corrugated steel plate ring;
a ring-shaped steel frame (5) is arranged in the corrugated steel plate ring, and a compressible steel pipe (6) is arranged between the steel frame (5) and the corrugated steel plate ring;
the corrugated steel plate ring is formed by assembling a plurality of circular arc corrugated steel plates (3), the edges of the corrugated steel plates (3) are provided with round bolt holes (10) or strip-shaped chute holes (8), and the edges of two adjacent corrugated steel plates (3) are stacked to enable the bolt holes (10) to be aligned with the chute holes (8) and fixed through bolts (9);
an anchor rod hole (11) for punching a long glass fiber anchor rod (4) is formed in the corrugated steel plate (3);
the steel frame (5) is divided into a plurality of sections in the circumferential direction, and the sections are connected into a ring through a compressible joint (7);
the compressible joint (7) comprises two sections of U-shaped steel (12), one end part of the U-shaped steel is placed in the U-shaped groove of the other end part, part of the U-shaped steel is overlapped with the outer annular sleeve clamp (13), the two sections of U-shaped steel (12) slide to overlap up and down under the action of external pressure, and the circumferential deformation is realized by shortening the circumference of the steel frame;
the U-shaped steel (12) is connected with the steel frame (5) through an end plate and bolts;
the compressible steel pipes (6) are radially arranged at intervals along the outer cambered surface of the steel section frame (5), one end of each steel pipe (6) is welded to the outer edge of the steel section frame (5), and the other end of each steel pipe directly abuts against the inner edge of the corrugated steel plate (3);
the compressible steel tube (6) is flattened along the radial direction under the action of external force, so that the support system is deformed along the radial direction;
the compressible steel tube (6) is allowed to be compressed, the corrugated steel plate (3) is flattened under the action of surrounding rock pressure, the diameter of the steel tube is matched with the space to be compressed, and the compressible steel tube (6) is flattened along the radial direction under the action of external force, so that the support system is deformed along the radial direction.
2. The construction method of the recycled assembled advanced stress relief pilot tunnel supporting structure according to claim 1, which is characterized by comprising the following steps:
the method comprises the following steps:
the advanced pilot tunnel (2) is excavated before the main tunnel (1), and assembled corrugated steel plates (3), long glass fiber anchor rods (4) and profile steel frames (5) are timely applied after the excavation to form a combined type pressure-allowed supporting structure;
when the deformation rate of the supporting structure is too high or the deformation amount is too large, the steel frame (5) is encrypted, the long glass fiber anchor rod (4) is lengthened, and the deformation is controlled within an acceptable range;
the advanced pilot tunnel (2) and the main tunnel (1) are excavated and pushed in parallel, when the advanced pilot tunnel (2) advances by 40m, the tunnel face of the main tunnel (1) is excavated, a support is applied, and the advanced pilot tunnel corrugated steel plate (3) and the profile steel frame (4) are removed;
repairing the corrugated steel plate (3) with local damage deformation and the steel section steel frame (5), and re-welding the compressible steel tube (6) on the steel section steel frame (5) for continuous use in subsequent cycles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910653497.XA CN110397453B (en) | 2019-07-19 | 2019-07-19 | Assembly type advanced stress release pilot tunnel supporting structure capable of being recycled and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910653497.XA CN110397453B (en) | 2019-07-19 | 2019-07-19 | Assembly type advanced stress release pilot tunnel supporting structure capable of being recycled and construction method |
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| CN110397453A CN110397453A (en) | 2019-11-01 |
| CN110397453B true CN110397453B (en) | 2024-02-27 |
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| CN111878123B (en) * | 2020-08-05 | 2021-11-09 | 同济大学 | Tunnel primary support construction method capable of adapting to high ground stress and rock burst |
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| CN113137242B (en) * | 2021-03-16 | 2023-06-02 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | Assembled type combined supporting structure for tunnel in deep underground space |
| CN113073993A (en) * | 2021-04-16 | 2021-07-06 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | Damping structure for roadway assembled supporting system |
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