CN115306438A - Construction method for underground excavation and hole entering on existing urban tunnel secondary lining structure - Google Patents
Construction method for underground excavation and hole entering on existing urban tunnel secondary lining structure Download PDFInfo
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- CN115306438A CN115306438A CN202210944312.2A CN202210944312A CN115306438A CN 115306438 A CN115306438 A CN 115306438A CN 202210944312 A CN202210944312 A CN 202210944312A CN 115306438 A CN115306438 A CN 115306438A
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- tunnel
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- construction method
- existing tunnel
- secondary lining
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- 238000010276 construction Methods 0.000 title claims abstract description 36
- 238000009412 basement excavation Methods 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 29
- 239000010959 steel Substances 0.000 claims abstract description 29
- 229910000746 Structural steel Inorganic materials 0.000 claims abstract description 4
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000003014 reinforcing effect Effects 0.000 abstract description 3
- 239000004568 cement Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
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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
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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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
- E21D11/12—Temporary supports for use during building; Accessories
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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
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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- 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
- E21F16/02—Drainage of tunnels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- 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)
- Lining And Supports For Tunnels (AREA)
Abstract
A construction method for underground excavation and hole entry on an existing tunnel secondary lining structure in a city comprises the following steps: s1, constructing temporary support of the existing tunnel structural steel upright column; s2, excavating a pilot tunnel and constructing a temporary support; s3, reversely expanding and excavating, excavating a standard section of the newly-built tunnel and primarily supporting; s4, constructing a door-shaped frame structure system; s5, dismantling a temporary support of the existing tunnel structure steel upright; s6, monitoring the deformation of the existing tunnel structure, wherein the construction method reduces the damage height of the existing structure through the advanced pilot tunnel and the door-shaped frame structure system, reduces the disturbance to the existing structure, enhances the bearing capacity and stress conversion among the structures, and ensures the safety of the existing tunnel secondary lining structure; safety guarantee is provided for the excavation construction process through temporary steel supports and the advanced large pipe shed; the leakage resistance between the new structure and the old structure is improved by the construction method of the waterproof and drainage reinforcing system.
Description
Technical Field
The invention relates to the technical field of tunnel engineering, in particular to a construction method for secretly digging a hole in an existing tunnel secondary lining structure in a city.
Background
In the construction of newly-built tunnel engineering, the opening is usually directly opened on a mountain body or a rock surface to enter a hole, the stress condition of surrounding rocks is simple, and the stability is relatively easy to control.
In many urban underground projects, new and old structures are built in stages to be broken and combined to form tunnel groups with cross interfaces. The existing tunnel structure is newly built with an opening, if a common hole entering measure or mode is used, the damage range of the existing tunnel structure is relatively large, the larger the safety disturbance is, and the structural safety cannot be guaranteed. In the construction process, the hole cannot be effectively sealed for a long time, the combination difficulty of a new structure and an old structure is high, the waterproof influence range is relatively large, and the like are all adverse factors required to be faced by a common hole entering mode.
Therefore, it is necessary to design a construction method for excavating a hole in an existing tunnel secondary lining structure to solve some technical problems in the prior art.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a construction method for secretly digging a hole in an existing urban tunnel secondary lining structure, which comprises the following steps:
s1, temporary support construction of existing tunnel structural steel stand columns;
s2, excavating a pilot tunnel and constructing a temporary support;
s3, reversely expanding and excavating, excavating a standard section of the newly-built tunnel and primarily supporting;
s4, constructing a door-shaped frame structure system;
s5, dismantling a temporary support of the existing tunnel structure steel upright;
and S6, monitoring the deformation of the existing tunnel structure.
Preferably, the step S2 includes the steps of:
s21, constructing a big pipe shed by leading a pilot tunnel;
s22, excavating a pilot tunnel;
and S23, constructing a temporary supporting arch frame of the pilot tunnel.
Preferably, the step S4 includes the steps of:
s41, effectively connecting a door-shaped frame structure system with a waterproof layer and a steel bar of an existing tunnel structure, and treating a construction joint;
s42, pouring a door-shaped frame beam structure, grouting a pipe, and reserving a pre-buried pipeline for construction.
Preferably, in step S1, the steel upright temporary supports are connected to each other by steel tie beams, a stiffening rib is disposed at a node, and a top end of the steel upright temporary support is tightly attached to a concrete surface of an existing tunnel arch structure.
Preferably, in step S21, the leading large pipe shed is arranged in 4m and 6m sections, and is driven in sections, and the joints are staggered.
Preferably, in step S23, the temporary arch support of the pilot tunnel needs to apply a foot-locking anchor at each arch foot and arch-raising line node.
Preferably, in step S41, the door-shaped frame structure is welded and fixed to the waterproof layer, and the drainage blind pipe is encrypted to drain at a position where the weld is large, that is, where the water seepage is large.
Compared with the prior art, the invention has the beneficial effects that: the construction method reduces the damage height of the existing structure through the pilot tunnel and the door-shaped frame structure system, reduces the disturbance to the existing structure, strengthens the bearing capacity and stress conversion between the structures, and ensures the safety of the existing tunnel secondary lining structure; safety guarantee is provided for the excavation construction process through temporary steel supports and the advanced large pipe shed; the leakage resistance between the new structure and the old structure is improved by the construction method of the waterproof and drainage reinforcing system.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
figure 1 is a plan view of an undercut entry hole in an existing tunnel secondary lining structure.
Figure 2 is a front view of a tunnel being undercut into a hole in an existing tunnel secondary lining structure.
Figure 3 is a side view of a tunnel undercut into a hole in an existing tunnel secondary structure.
In the figure: 1. temporarily supporting the steel upright; 2. leading a hole in advance; 3. a portal frame structure beam; 4. a portal frame structure column; 5. advancing a large pipe shed; 6. a grouting pipe; 7. and reserving a pre-buried pipeline.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the embodiments.
Referring to fig. 1 to 3, a construction method for excavating a hole in an existing urban tunnel secondary lining structure includes the following steps:
s1, constructing a temporary support 1 of an existing tunnel structural steel upright column;
s2, excavation and temporary support construction of leading tunnel 2
S21, constructing a leading tunnel 2 in advance of the large pipe shed 5;
s22, excavating the pilot tunnel 2;
s23, constructing a temporary supporting arch frame of the pilot tunnel 2;
s3, reversely expanding and excavating, excavating a standard section of the newly-built tunnel and primarily supporting;
s4, constructing a door-shaped frame structure system: constructing a door-shaped frame structure beam 3 and a door-shaped frame structure upright post 4 in a door-shaped frame structure system;
s41, effectively connecting a door-shaped frame structure system with a waterproof layer and a steel bar of an existing tunnel structure, and treating a construction joint;
s42, pouring a door-shaped frame beam structure, grouting a pipe 6 and reserving a pre-buried pipeline 7 for construction;
s5, dismantling the temporary support 1 of the existing tunnel structure steel upright post;
and S6, monitoring the deformation of the existing tunnel structure.
In the figures 1 and 3, the temporary supports 1 of the steel columns are phi 500, t =16mm hot-rolled seamless steel tubes, the steel columns are connected into a whole by steel connecting beams, the steel connecting beams are triangular wedges welded by matching double-spliced I16-type steel with steel plates, after prestress is applied, C20 concrete is poured and fixed on footing, so that the safety of the existing tunnel structure is ensured, stiffening ribs are arranged at nodes, and the top ends of the temporary supports 1 of the steel columns are tightly attached to the concrete surface of the existing tunnel arch structure.
In the figure 2, outside the excavation outline of the pilot tunnel 2, phi 108 x 6 advanced large pipe sheds 5 with the length of 10M, the ring distance of 0.4M and the inclination angle of 1-2 degrees are constructed, each pipe shed is arranged according to the lengths of 4M and 6M in a segmented manner, the joints are staggered, and M30 cement slurry is adopted for pre-grouting of the advanced large pipe sheds 5, so that safety guarantee is provided in the excavation construction process.
In the figures 2 and 3, the prior pilot tunnel 2 excavation is to reduce the disturbance to the structure as much as possible, so as to ensure short footage, one excavation is carried out, and the temporary support adopts the form of profile steel arch centering matched with anchor net spraying, so as to ensure the structure safety.
In the figures 1 and 3, the temporary support of the pilot tunnel 2 is gradually removed in the process until the wall back of the existing side wall structure is excavated in a reverse expanding mode according to the standard section of the newly-built tunnel, and meanwhile, the preliminary support of the main tunnel is constructed, and the structural safety is ensured by adopting the mode that a profile steel arch frame is matched with an anchor net for spraying. And finally, manually excavating a door-shaped frame structure foundation trench.
In the figure 3, after the gate-type frame structure foundation trench is dug in place, the waterproof layer of the gate-type frame structure is effectively welded with the waterproof layer stripped from the existing structure, a drainage blind pipe is arranged for drainage, a water swelling water stop strip is arranged after the joint concrete surface is cleaned and roughened, the cross section is coated with cement permeable crystalline coating, the treatment quality of the construction joint is ensured, a phi 32 grouting steel pipe is pre-buried before concrete pouring so as to facilitate later-stage grouting, and the structure is guaranteed to be compact and reliable.
In fig. 1 and 3, after the door-shaped frame structure and the first formwork second lining concrete of the newly-built tunnel reach the design strength, the temporary supports 1 of the steel upright posts are orderly removed by manpower, and then the newly-built tunnel is normally constructed.
The construction method reduces the damage height of the existing structure through the pilot tunnel 2 and the door-shaped frame structure system, reduces the disturbance to the existing structure, strengthens the bearing capacity and stress conversion between the structures, and ensures the safety of the existing tunnel secondary lining structure; the temporary steel supports and the advanced large pipe shed 5 provide safety guarantee for the excavation construction process; the leakage resistance between the new structure and the old structure is improved by the construction method of the waterproof and drainage reinforcing system.
As above, while the invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited thereto. Various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A construction method for underground excavation and hole entering on a secondary lining structure of an existing tunnel in a city is characterized by comprising the following steps:
s1, temporary support construction of existing tunnel structural steel stand columns;
s2, excavating a pilot tunnel and constructing a temporary support;
s3, reversely expanding and excavating, excavating a standard section of the newly-built tunnel and primarily supporting;
s4, constructing a door-shaped frame structure system;
s5, dismantling a temporary support of the existing tunnel structure steel upright;
and S6, monitoring the deformation of the existing tunnel structure.
2. The construction method for underground excavation and entering of the hole in the secondary lining structure of the urban existing tunnel according to claim 1, wherein the step S2 comprises the following steps:
s21, constructing a big pipe shed by leading a pilot tunnel;
s22, excavating a pilot tunnel;
and S23, constructing a temporary supporting arch frame of the pilot tunnel.
3. The construction method for undercutting and digging a hole in an existing urban tunnel secondary lining structure according to claim 1, wherein the step S4 comprises the following steps:
s41, effectively connecting a door-shaped frame structure system with a waterproof layer and a steel bar of an existing tunnel structure, and treating a construction joint;
s42, pouring a door-shaped frame beam structure, grouting a pipe, and reserving a pre-buried pipeline for construction.
4. The construction method for underground excavation and entering of the secondary lining structure of the urban existing tunnel according to claim 1, wherein in the step S1, the temporary supports of the steel columns are connected into a whole by steel connecting beams, stiffening ribs are arranged at nodes, and the top ends of the temporary supports of the steel columns are tightly attached to the concrete surface of the arch structure of the existing tunnel.
5. The construction method for secretly digging a hole in a secondary lining structure of an existing tunnel in a city according to claim 2, wherein in the step S21, the lengths of the sections of the large advancing pipe shed are arranged according to 4m and 6m, the sections are driven in, and the joints are staggered.
6. The construction method for underground excavation of a hole in a secondary lining structure of an urban existing tunnel according to claim 2, wherein in step S23, the temporary arch support of the pilot tunnel is constructed by applying a foot-locking anchor at each arch foot and arch-raising line node.
7. The construction method for secretly digging and entering a hole in the secondary lining structure of the urban existing tunnel according to claim 2, wherein in the step S41, the door-shaped frame structure is welded and fixed with the waterproof layer, and drainage blind pipes are arranged at positions with larger welding seams, namely positions with larger water seepage for drainage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210944312.2A CN115306438A (en) | 2022-08-08 | 2022-08-08 | Construction method for underground excavation and hole entering on existing urban tunnel secondary lining structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210944312.2A CN115306438A (en) | 2022-08-08 | 2022-08-08 | Construction method for underground excavation and hole entering on existing urban tunnel secondary lining structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115306438A true CN115306438A (en) | 2022-11-08 |
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ID=83859978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210944312.2A Pending CN115306438A (en) | 2022-08-08 | 2022-08-08 | Construction method for underground excavation and hole entering on existing urban tunnel secondary lining structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115306438A (en) |
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2022
- 2022-08-08 CN CN202210944312.2A patent/CN115306438A/en active Pending
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