CN104329095B - A kind of existing tunnel Widening Construction method - Google Patents
A kind of existing tunnel Widening Construction method Download PDFInfo
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- CN104329095B CN104329095B CN201410444917.0A CN201410444917A CN104329095B CN 104329095 B CN104329095 B CN 104329095B CN 201410444917 A CN201410444917 A CN 201410444917A CN 104329095 B CN104329095 B CN 104329095B
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- 238000010276 construction Methods 0.000 title claims abstract description 83
- 238000009412 basement excavation Methods 0.000 claims abstract description 69
- 239000011435 rock Substances 0.000 claims abstract description 29
- 230000000694 effects Effects 0.000 claims abstract description 9
- 238000004873 anchoring Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 18
- 201000010099 disease Diseases 0.000 claims description 6
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000012163 sequencing technique Methods 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 210000005239 tubule Anatomy 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 2
- 230000009471 action Effects 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000012407 engineering method Methods 0.000 abstract description 4
- 239000002689 soil Substances 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- JHJNPOSPVGRIAN-SFHVURJKSA-N n-[3-[(1s)-1-[[6-(3,4-dimethoxyphenyl)pyrazin-2-yl]amino]ethyl]phenyl]-5-methylpyridine-3-carboxamide Chemical compound C1=C(OC)C(OC)=CC=C1C1=CN=CC(N[C@@H](C)C=2C=C(NC(=O)C=3C=C(C)C=NC=3)C=CC=2)=N1 JHJNPOSPVGRIAN-SFHVURJKSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000005641 tunneling 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
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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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
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- Environmental & Geological Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The present invention relates to a kind of existing tunnel Widening Construction method, in it uses excavation hole quarrel that existing tunnel carries out hole, backfill is reinforced, existing tunnel structure to be formed effective lateral protection, utilize existing tunnel structure that tunnel is widened piecemeal that excavated section formed and radially support action and the longitudinal bracing effect that face in hole is formed, existing tunnel structure is enable to play the effect of the space supporting being similar to face Core Soil, can effective deformation controlling for rock surrounding gateways；Periphery along existing tunnel structure, use arc step excavation of topping bar, left and right sides of getting out of a predicament or an embarrassing situation to jump and dig Ma Kou and inverted arch paragraphs the construction method of annular step excavation at the end, width and the height of step excavation can be reduced, it is substantially reduced tunnel Widening Construction difficulty, is reduced or avoided and gib measure is set.The present invention can also be suitable for that right side is widened, the three kinds of widening modes widened with the left and right sides are widened in left side, and the linking of the engineering method conversion between different widening modes is fairly simple.
Description
Technical field
The present invention relates to Tunnel Engineering field, be specifically related to a kind of existing tunnel Widening Construction method.
Background technology
Existing tunnel carries out widening in situ typically have three kinds of methods: a kind of is that the right side to existing tunnel is widened, will both
Tunnel is had to be arranged in the left part widening tunnel；Another kind is that the left side to existing tunnel is widened, i.e. existing tunnel is positioned at and widens tunnel
The right part in road；Also having a kind of is that the left and right sides to existing tunnel is widened, and now existing tunnel is positioned at the middle part widening tunnel.It is subject to
The impact of the factors such as the External building thing distribution of existing tunnel hole, land used condition and hole external connection condition, existing tunnel is widened
Method may have multiple combination, in some instances it may even be possible to occurring three kinds in same seat tunnel and widen method, difference is widened between method
The linking of engineering method conversion is more complicated, and it is long in time limit, and technology requires the highest.
Existing tunnel widen after tunnel excavation total span and total height and excavation area the biggest.Existing tunnel
Widening Construction Technique usually uses for reference the construction technology of newly-built Large span tunnel, uses the substeps such as benching tunneling method, CD method or CRD method
The construction method of excavation；Owing to not making full use of the existing tunnel structure support action to country rock, existing tunnel is widened and is executed
Work technology is often existing tunnel structure to be excavated together with country rock or remove, and its excavation span is big, and difficulty of construction is high.Though
So, for relative newly-built structure, the mechanical property of existing tunnel structure there may be reduction in various degree, but, existing tunnel
Road country rock and supporting construction remain a metastable support system, still have the supporting of preferable space in construction
Effect, can be made full use of as the temporary support structures in tunnel Widening Construction.It practice, existing tunnel widen excavation
Scope is limited only to the peripheral rock of existing tunnel structure, after using step excavation, its step excavation width and height all than
Less, if it is possible to the Appropriate application existing tunnel structure support action to country rock, the difficulty of tunnel Widening Construction can be substantially reduced
Degree, is reduced or avoided and arranges gib measure.Therefore, existing tunnel Widening Construction Technique can optimize further.
Summary of the invention
The problem that the present invention is directed to the existence of above-mentioned prior art makes improvements, i.e. the technical problem to be solved in the present invention is to carry
For a kind of existing tunnel Widening Construction method, it can facilitate the different engineering method widening between method conversion linking, energy in construction
Enough Appropriate application existing tunnel structure space support actions to country rock, it is possible to decrease the difficulty of tunnel Widening Construction.
In order to solve above-mentioned technical problem, the technical scheme is that a kind of existing tunnel Widening Construction method, including
Following construction procedure:
1) utilize the part of getting out of a predicament or an embarrassing situation in the quarrel backfill existing tunnel of excavation hole, form backfill layer of getting out of a predicament or an embarrassing situation, in order to existing
Tunnel structure forms the effect of lateral protection；
2) excavation is topped bar vault part, including the vault part country rock in the range of excavation existing tunnel vault central angle,
Remove the vault existing structure in the range of this, and utilize dome portions separately to dig a hole quarrel, topping bar in existing tunnel is carried out back
Fill out, there is lateral protective action top bar backfill layer so that existing tunnel structure is formed；Meanwhile, vault of topping bar is applied in time
Part preliminary bracing and lock foot anchoring stock；
3) excavation top bar left part country rock, remove left part existing structure, and apply in time top bar left part preliminary bracing and
Lock foot anchoring stock；
4) excavation top bar right part country rock, remove right part existing structure, and apply in time top bar right part preliminary bracing and
Lock foot anchoring stock；
5) excavation get out of a predicament or an embarrassing situation left part country rock, remove left part existing structure, and apply in time get out of a predicament or an embarrassing situation left part preliminary bracing and
Lock foot anchoring stock；
6) excavation get out of a predicament or an embarrassing situation right part country rock, remove right part existing structure, and apply in time get out of a predicament or an embarrassing situation right part preliminary bracing and
Lock foot anchoring stock；
7) get out of a predicament or an embarrassing situation the bottomed excavation of left part, and apply the bottomed preliminary bracing of left part of getting out of a predicament or an embarrassing situation and lock foot anchoring stock in time；
8) get out of a predicament or an embarrassing situation the bottomed excavation of right part, and apply the bottomed preliminary bracing of right part of getting out of a predicament or an embarrassing situation and lock foot anchoring stock in time；
9) get out of a predicament or an embarrassing situation middle part bottomed excavation, including excavation get out of a predicament or an embarrassing situation middle part bottomed country rock, dismounting bottom existing structure, and and
Time apply get out of a predicament or an embarrassing situation middle part bottomed preliminary bracing；
10) pouring construction inverted arch, abutment wall and arch secondary lining, and synchronize laying construction waterproof layer structure.
Further, in step 1), can be according to existing tunnel disease incidence and requirement of engineering, first in existing tunnel
Liner structure disease behind is carried out grouting and reinforcing process, to guarantee engineering construction safety.
Further, in step 2), 3), 4) in, first can apply super according to tunnel surrounding condition and requirement of engineering
The leading pre-supporting measures such as front steel tube shed, advanced tubule or advance anchor bolt.
Further, in step 2), 3), 4) in, when the excavation width of top bar left part or right part of topping bar is smaller, difficult
With formed construction working face time, can by top bar left part or right part of topping bar excavation sequence of construction adjust to arch of topping bar
Part excavation synchronous construction, will step 2) and step 3) synchronization implementation, or by step 2) and step 4) synchronization implementation.
Further, in step 2) in, the existing tunnel vault center of circle can be adjusted according to concrete engineering situation and construction requirement
The size at angle, dome portions of topping bar separately dig a hole quarrel amount should meet top bar backfill layer backfill amount requirement, dome portions of topping bar
Divide plumb line at the left and right sides arch springing of preliminary bracing should be positioned at the outside of left and right portion existing structure of getting out of a predicament or an embarrassing situation.
Further, in step 2), 3), 4) in, can according to tunnel surrounding condition and construction needs, arrange and face upward temporarily
Arch supporting measure.
Further, step 3), 4), 5), 6), 7), 8) in, when the excavation width of tunnel right part is wider than the excavation of left part
Degree hour, right part of the most first constructing, constructs left part, afterwards i.e. according to 4), 3), 6), 5), 8), 7) sequencing construction.
Further, step 3), 4), 5), 6) in, when excavation width is bigger, when can form construction working face, can be first
First excavate the country rock outside existing structure and apply preliminary bracing and lock foot anchoring stock in time, afterwards, then removing existing structure, and fit
Time remove the upper and lower step backfill layer in existing tunnel.
Further, step 3), 4), 5), 6) in, guaranteeing that existing structure is formed the most anti-by up/down steps backfill layer
On the premise of protecting and take into account up/down steps easy construction, excavation removes up/down steps backfill layer in time.
Further, step 5), 6), 7), 8) in, when left part of getting out of a predicament or an embarrassing situation is bottomed or right part of getting out of a predicament or an embarrassing situation is bottomed excavation is high
Degree or width is smaller, be difficult to formed construction working face time, can be by bottomed for left part of getting out of a predicament or an embarrassing situation or that right part of getting out of a predicament or an embarrassing situation is bottomed excavation
Sequence of construction adjust to left part or right part of the getting out of a predicament or an embarrassing situation excavation synchronous construction of getting out of a predicament or an embarrassing situation, will step 5) and step 7) synchronize real
Execute, or by step 6) and step 8) synchronization implementation.
Further, in step 10), Second Lining Construction is after the stabilization of tunnel surrounding and supporting construction
Carry out, when construction needs, it is possible to bear corresponding load design and secondary lining of constructing in advance by secondary lining.
Further, in the overall process of constructing tunnel, each construction working face must be adjusted in time according to monitoring measurement information
Between safe distance, and engineering time between each sequence of construction.
Compared with prior art, the method have the advantages that the present invention uses excavation hole quarrel to enter existing tunnel
In row hole, backfill is reinforced, in order to existing tunnel structure is formed effective lateral protection, and utilizes existing tunnel structure to tunnel
Widen piecemeal that excavated section formed and radially support action and longitudinal bracing effect that face in hole is formed, make
Existing tunnel structure can play the effect of the space supporting being similar to face Core Soil, can effective deformation controlling for rock surrounding gateways；Edge
The periphery of existing tunnel structure, uses the jumping of arc step excavation of topping bar, left and right sides of getting out of a predicament or an embarrassing situation to dig Ma Kou and inverted arch paragraphs at the end
The construction method of annular step excavation, width and the height of step excavation can be reduced, be substantially reduced tunnel Widening Construction difficulty,
It is reduced or avoided and gib measure is set.The present invention can also be suitable for that right side is widened, left side is widened and widened with the left and right sides
Three kinds of widening modes, and the linking of the engineering method conversion between different widening modes is fairly simple.
The present invention is further detailed explanation with detailed description of the invention below in conjunction with the accompanying drawings.
Accompanying drawing explanation
Fig. 1 is the construction method schematic diagram of the embodiment of the present invention.
In figure: 1-gets out of a predicament or an embarrassing situation backfill layer, 2-vault part, 2a-vault existing structure, 3-tops bar backfill layer, and 4-appears on the stage
Rank left part, 4a-tops bar left part existing structure, and 5-tops bar right part, and 5a-tops bar right part existing structure, and 6-gets out of a predicament or an embarrassing situation left part,
6a-gets out of a predicament or an embarrassing situation left part existing structure, and 7-gets out of a predicament or an embarrassing situation right part, and 7a-gets out of a predicament or an embarrassing situation right part existing structure, and 8-left part of getting out of a predicament or an embarrassing situation is bottomed, 9-
Right part of getting out of a predicament or an embarrassing situation is bottomed, 10-get out of a predicament or an embarrassing situation middle part bottomed, existing structure bottom 10a-, 11-lock foot anchoring stock, 12-preliminary bracing, 13-
Secondary lining, 14-existing tunnel vault central angle, 15-existing tunnel center line, plumb line at arch springing on the left of 16-, encircles on the right side of 17-
Plumb line at foot.
Detailed description of the invention
It is illustrated with specific embodiment below, as it is shown in figure 1, a kind of existing tunnel Widening Construction method, including following
Step:
1) utilize the part of getting out of a predicament or an embarrassing situation in the quarrel backfill existing tunnel of excavation hole, form backfill layer 1 of getting out of a predicament or an embarrassing situation, in order to leave from office
Rank left part existing structure 6a and the right part existing structure 7a that gets out of a predicament or an embarrassing situation forms the effect of lateral protection；
2) excavate vault part 2 of topping bar, enclose including the vault part 2 in the range of excavation existing tunnel vault central angle 14
Rock, remove the vault existing structure 2a in the range of this, and utilize vault part 2 to excavate produced hole quarrel, in existing tunnel
Top bar and backfill, with the left part existing structure 4a and the right part existing structure 5a that tops bar that tops bar is formed have lateral anti-
Protect the backfill layer 3 of topping bar of effect；Meanwhile, top bar vault part 2 preliminary bracing 12 and lock foot anchoring stock 11 are applied in time；
3) excavation top bar left part 4 country rock, remove left part existing structure 4a, and apply left part 4 initial stage of topping bar in time and prop up
Protect 12 and lock foot anchoring stock 11；
4) excavation top bar right part 5 country rock, remove right part existing structure 5a, and apply right part 5 initial stage of topping bar in time and prop up
Protect 12 and lock foot anchoring stock 11；
5) excavation get out of a predicament or an embarrassing situation left part 6 country rock, remove left part existing structure 6a, and apply left part 6 initial stage of getting out of a predicament or an embarrassing situation in time and prop up
Protect 12 and lock foot anchoring stock 11；
6) excavation get out of a predicament or an embarrassing situation right part 7 country rock, remove right part existing structure 7a, and apply right part 7 initial stage of getting out of a predicament or an embarrassing situation in time and prop up
Protect 12 and lock foot anchoring stock 11；
7) bottomed 8 excavations of left part of getting out of a predicament or an embarrassing situation, and apply bottomed 8 preliminary bracing 12 and the lock foot anchoring stocks of left part of getting out of a predicament or an embarrassing situation in time
11；
8) bottomed 9 excavations of right part of getting out of a predicament or an embarrassing situation, and apply bottomed 9 preliminary bracing 12 and the lock foot anchoring stocks of right part of getting out of a predicament or an embarrassing situation in time
11；
9) get out of a predicament or an embarrassing situation middle part bottomed 10 excavation, including excavation get out of a predicament or an embarrassing situation middle part bottomed 10 country rocks, remove bottom existing structure
10a, and apply bottomed 10 preliminary bracings 12 in middle part of getting out of a predicament or an embarrassing situation in time；
10) pouring construction inverted arch, abutment wall and arch secondary lining 13, and synchronize laying construction waterproof layer structure.
In step 1), first in existing tunnel, lining cutting can be tied according to existing tunnel disease incidence and requirement of engineering
Structure disease behind carries out grouting and reinforcing process, to guarantee engineering construction safety.
In step 2), 3), 4) in, can according to tunnel surrounding condition and requirement of engineering, first apply super-front large pipe shed,
The leading pre-supporting measure such as advanced tubule or advance anchor bolt.
In step 2), 3), 4) in, when the excavation width of top bar left part 4 or right part 5 of topping bar is smaller, be difficult to be formed
During construction working face, the sequence of construction topping bar left part 4 or right part 5 of topping bar excavates can be adjusted to arch part of topping bar
2 excavation synchronous constructions, will step 2) and step 3) synchronization implementation, or by step 2) and step 4) synchronization implementation.
In step 2) in, the big of existing tunnel vault central angle 14 can be adjusted according to concrete engineering situation and construction requirement
Little, vault part 2 of topping bar excavates hole quarrel amount should meet the backfill amount requirement of backfill layer 3 of topping bar, and tops bar at the beginning of vault part 2
The left side arch springing plumb line 16 of phase supporting 12 should be positioned at plumb line at the outside of left part existing structure (6a) of getting out of a predicament or an embarrassing situation, right side arch springing
17 outsides that should be positioned at right part existing structure (7a) that get out of a predicament or an embarrassing situation.
In step 2), 3), 4) in, can according to tunnel surrounding condition and construction needs, interim inverted arch supporting is set and arranges
Execute.
Step 3), 4), 5), 6), 7), 8) in, when the excavation width ratio of top bar right part 5 and right part 7 of getting out of a predicament or an embarrassing situation is appeared on the stage
Rank left part 4 and the excavation width hour of left part 6 of getting out of a predicament or an embarrassing situation, right part 5, get out of a predicament or an embarrassing situation right part 7 and the right side of getting out of a predicament or an embarrassing situation of topping bar of the most first constructing
At the bottom of clan 9, rear construction is topped bar left part 4, get out of a predicament or an embarrassing situation left part 6 and left part of getting out of a predicament or an embarrassing situation bottomed 8, i.e. according to 4), 3), 6), 5), 8),
7) sequencing construction.
In step 3) or 4) or 5) or 6) in, when excavation width is bigger, when can form construction working face, can first excavate
Top bar left part 4 or top bar right part 5 or get out of a predicament or an embarrassing situation left part 6 or right part 7 country rock of getting out of a predicament or an embarrassing situation outside existing structure, and execute in time
Make preliminary bracing 12 and lock foot anchoring stock 11, afterwards, then remove top bar left part existing structure (4a) or the existing knot of right part of topping bar
Structure (5a) or get out of a predicament or an embarrassing situation left part existing structure (6a) or right part existing structure (7a) of getting out of a predicament or an embarrassing situation, and remove top bar backfill layer 3 or
Get out of a predicament or an embarrassing situation and backfill layer 1.
Step 3), 4), 5), 6) in, guaranteeing to top bar backfill layer 3 or existing structure is formed by backfill layer 1 of getting out of a predicament or an embarrassing situation
Effectively lateral protection on the premise of taking into account up/down steps easy construction, excavation removing in time is topped bar backfill layer 3 or get out of a predicament or an embarrassing situation
Backfill layer 1.
Step 5), 6), 7), 8) in, when left part of getting out of a predicament or an embarrassing situation bottomed 8 or the excavation height of right part of getting out of a predicament or an embarrassing situation bottomed 9 or width
Spend smaller, when being difficult to be formed construction working face, can be by bottomed for left part of getting out of a predicament or an embarrassing situation 8 or the excavation construction of right part of getting out of a predicament or an embarrassing situation bottomed 9
Order adjust to get out of a predicament or an embarrassing situation left part 6 or right part 7 of getting out of a predicament or an embarrassing situation excavates synchronous construction, will step 5) and step 7) synchronization implementation,
Or by step 6) and step 8) synchronization implementation.
In step 10), secondary lining 13 construction is to carry out after the stabilization of tunnel surrounding and supporting construction,
When construction needs, it is possible to bear corresponding load design and secondary lining of constructing in advance by secondary lining 13.
In the present embodiment, in the overall process of constructing tunnel, each construction work must be adjusted in time according to monitoring measurement information
Make the engineering time between the safe distance between face, and each sequence of construction.
The above, be only presently preferred embodiments of the present invention, the present invention not do any pro forma restriction,
Any without departing from technical solution of the present invention content, according to the technical spirit of the present invention above example is done any simply
Amendment, equivalent variations and modification, belong in the range of technical solution of the present invention.
Claims (1)
1. an existing tunnel Widening Construction method, it is characterised in that comprise the following steps:
1) utilize the part of getting out of a predicament or an embarrassing situation in the quarrel backfill existing tunnel of excavation hole, form backfill layer of getting out of a predicament or an embarrassing situation, in order to existing tunnel
Structure forms the effect of lateral protection；
2) vault part of topping bar is excavated, including the vault part country rock in the range of excavation existing tunnel vault central angle, dismounting
Vault existing structure in the range of Gai, and utilize dome portions separately to dig a hole quarrel, topping bar in existing tunnel is backfilled, with
Existing tunnel structure is formed and there is lateral protective action tops bar backfill layer；Meanwhile, vault part of topping bar is applied in time
Preliminary bracing and lock foot anchoring stock；
3) excavate left part country rock of topping bar, remove left part existing structure, and apply top bar left part preliminary bracing and lock foot in time
Anchor pole；
4) excavate right part country rock of topping bar, remove right part existing structure, and apply top bar right part preliminary bracing and lock foot in time
Anchor pole；
5) excavate left part country rock of getting out of a predicament or an embarrassing situation, remove left part existing structure, and apply get out of a predicament or an embarrassing situation left part preliminary bracing and lock foot in time
Anchor pole；
6) excavate right part country rock of getting out of a predicament or an embarrassing situation, remove right part existing structure, and apply get out of a predicament or an embarrassing situation right part preliminary bracing and lock foot in time
Anchor pole；
7) get out of a predicament or an embarrassing situation the bottomed excavation of left part, and apply the bottomed preliminary bracing of left part of getting out of a predicament or an embarrassing situation and lock foot anchoring stock in time；
8) get out of a predicament or an embarrassing situation the bottomed excavation of right part, and apply the bottomed preliminary bracing of right part of getting out of a predicament or an embarrassing situation and lock foot anchoring stock in time；
9) get out of a predicament or an embarrassing situation the bottomed excavation in middle part, get out of a predicament or an embarrassing situation existing structure bottom bottomed country rock, the dismounting of middle part including excavation, and execute in time
Bottomed preliminary bracing in the middle part of getting out of a predicament or an embarrassing situation；
10) pouring construction inverted arch, abutment wall and arch secondary lining, and synchronize laying construction waterproof layer structure；
In step 1), first in existing tunnel, liner structure can be carried on the back according to existing tunnel disease incidence and requirement of engineering
After disease carry out grouting and reinforcing process, to guarantee engineering construction safety, in step 2), 3), 4) in, can be according to tunnel surrounding bar
Part situation and requirement of engineering, first apply super-front large pipe shed, advanced tubule or advance anchor bolt and carry out leading pre-supporting；
In step 2), 3), 4) in, when the excavation width of top bar left part or right part of topping bar is smaller, be difficult to form construction work
When making face, the sequence of construction of top bar left part or right part of topping bar excavation can be adjusted to Tong Bu with arch part excavation of topping bar
Construction, will step 2) and step 3) synchronization implementation, or by step 2) and step 4) synchronization implementation；
In step 2) in, the size of existing tunnel vault central angle according to concrete engineering situation and construction requirement, can be adjusted, appear on the stage
Rank dome portions separately dig a hole quarrel amount should meet top bar backfill layer backfill amount requirement, a left side for vault part preliminary bracing of topping bar
At the arch springing of right side, plumb line should be positioned at the outside of left and right portion existing structure of getting out of a predicament or an embarrassing situation；
In step 2), 3), 4) in, can according to tunnel surrounding condition and construction needs, interim inverted arch supporting measure is set；
Step 3), 4), 5), 6), 7), 8) in, when the excavation width of tunnel right part is less than the excavation width of left part, the most first execute
Work right part, construct left part afterwards, i.e. according to 4), 3), 6), 5), 8), 7) sequencing construction；
Step 3), 4), 5), 6) in, when excavation width is bigger, when can form construction working face, can first excavate existing knot
Country rock outside structure also applies preliminary bracing and lock foot anchoring stock in time, afterwards, then removes existing structure, and removes existing tunnel in good time
In road upper and lower step backfill layer, step 3), 4), 5), 6) in, guaranteeing up/down steps backfill layer to existing structure formed
On the premise of effectively protecting and take into account up/down steps easy construction, excavation removes up/down steps backfill layer in time；
Step 5), 6), 7), 8) in, when the excavation height that left part of getting out of a predicament or an embarrassing situation is bottomed or right part of getting out of a predicament or an embarrassing situation is bottomed or width ratio relatively
Little, be difficult to formed construction working face time, bottomed for left part of getting out of a predicament or an embarrassing situation or that right part of getting out of a predicament or an embarrassing situation is bottomed construction order can be adjusted
To with left part or right part of the getting out of a predicament or an embarrassing situation excavation synchronous construction of getting out of a predicament or an embarrassing situation, will step 5) and step 7) synchronization implementation, or by step
6) and step 8) synchronization implementation；
In step 10), Second Lining Construction is to carry out after the stabilization of tunnel surrounding and supporting construction, works as construction
When needing, it is possible to bear corresponding load design and secondary lining of constructing in advance by secondary lining；
In the overall process of constructing tunnel, must according to monitoring measurement information, adjust in time safety between each construction working face away from
From, and the engineering time between each sequence of construction.
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| CN201410444917.0A CN104329095B (en) | 2014-09-03 | 2014-09-03 | A kind of existing tunnel Widening Construction method |
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|---|---|---|---|---|
| CN107542474B (en) * | 2017-09-18 | 2019-04-23 | 中铁广州工程局集团有限公司 | Tunnel oversized widened section surface controlled blasting excavation construction method |
| CN108131144A (en) * | 2017-12-05 | 2018-06-08 | 中铁工程装备集团有限公司 | A kind of construction method for widening traffic tunnel and uninterrupted traffic |
| CN109899092A (en) * | 2017-12-08 | 2019-06-18 | 中铁二局集团有限公司 | A kind of soft rock extrusion pressing type large deformation tunnel arch lock solid structure and method |
| JP2020084474A (en) * | 2018-11-20 | 2020-06-04 | 株式会社建技調査 | Widening construction method of existing tunnel |
| CN109538219B (en) * | 2018-12-21 | 2020-10-20 | 中铁四局集团有限公司 | In-situ expansion super-large section and partial excavation method of broken hard rock tunnel |
| CN110454171B (en) * | 2019-08-21 | 2021-03-12 | 中铁隧道局集团有限公司 | Method for converting construction from step method to double-side-wall pit guiding method in tunnel |
| CN110656977B (en) * | 2019-11-01 | 2024-07-12 | 中建八局轨道交通建设有限公司 | Double-layer pilot tunnel construction transverse channel dismantling-free temporary inverted arch backfill construction method and system |
| CN111441779B (en) * | 2020-03-23 | 2024-09-17 | 中交第四公路工程局有限公司 | Unilateral widening excavation supporting structure of tunnel under construction and construction method thereof |
| CN114086992B (en) * | 2021-11-18 | 2024-05-03 | 中铁二院重庆勘察设计研究院有限责任公司 | Large-span tunnel expanding and excavating construction method under complex geological conditions |
| CN114961739A (en) * | 2022-05-16 | 2022-08-30 | 中铁五局集团有限公司 | Construction method for re-excavation and expanded excavation of abandoned tunnel |
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| CN102121385B (en) * | 2011-03-18 | 2012-12-05 | 同济大学 | Tunnel excavation method for extending existing single-hole tunnel into double-arch tunnel |
| CN102226399A (en) * | 2011-06-02 | 2011-10-26 | 中铁二院工程集团有限责任公司 | Soft rock four-line large-span tunnel three-bench cable-bracing excavation construction method |
| CN102926757B (en) * | 2012-09-07 | 2015-09-09 | 中铁五局（集团）有限公司 | The construction method of the mountain ridge weak Large span tunnel two step four step excavation supporting |
| CN103195432A (en) * | 2013-03-08 | 2013-07-10 | 中铁二十二局集团第一工程有限公司 | Weak surrounding rock, tunnel intersection and arc-shaped pilot tunnel construction method |
| CN103362513A (en) * | 2013-07-29 | 2013-10-23 | 中铁七局集团第五工程有限公司 | Transformation and construction method for existing cavity in underground excavation region |
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