CN108868831A - Large cross-section tunnel excavation supporting structure - Google Patents
Large cross-section tunnel excavation supporting structure Download PDFInfo
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- CN108868831A CN108868831A CN201810832934.XA CN201810832934A CN108868831A CN 108868831 A CN108868831 A CN 108868831A CN 201810832934 A CN201810832934 A CN 201810832934A CN 108868831 A CN108868831 A CN 108868831A
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- tunnel
- steelframe
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- wall
- arch
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- 238000009412 basement excavation Methods 0.000 title claims abstract description 66
- 238000010276 construction Methods 0.000 claims abstract description 124
- 210000005239 tubule Anatomy 0.000 claims description 30
- 238000009434 installation Methods 0.000 description 20
- 239000007921 spray Substances 0.000 description 18
- 230000003014 reinforcing effect Effects 0.000 description 15
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 11
- 238000007569 slipcasting Methods 0.000 description 10
- 239000002689 soil Substances 0.000 description 9
- 231100000241 scar Toxicity 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000011435 rock Substances 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 241000209202 Bromus secalinus Species 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000007363 ring formation reaction Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
Abstract
The present invention provides a kind of large cross-section tunnel excavation supporting structure, including step supporting construction and main hole lower part supporting construction in the first base tunnel supporting construction, the second base tunnel supporting construction, the first sidewall structure, the second sidewall structure, main hole top top bar supporting construction, main hole top, along the longitudinal direction in tunnel, first base tunnel, the second base tunnel partly overlap with tunnel cross-section, first sidewall structure is set in the first base tunnel, first sidewall structure is located at outside tunnel cross-section, second sidewall structure is set in the second base tunnel, and the second sidewall structure is located at outside tunnel cross-section.The large cross-section tunnel excavation supporting structure have can prevent tunnel lateral deformation, bottom heave deformation, guarantee tunnel later period lining quality, and can effectively control big span, large cross-section tunnel construction in security risk the advantages of.
Description
Technical field
The present invention relates to technical field of tunnel construction, specifically, being to be related to a kind of large cross-section tunnel excavation supporting structure.
Background technique
In tunnel construction, for bad geological sections such as high-ground stress, weak broken wall rock locating for tunnel frequently with CRD method
With two side-wall pilot tunnel carry out constructing tunnel, still, traditional bilateral wall constructing process to high-ground stress such as fault belts flabbily
For layer, construction efficiency and just prop up the risk replaced that the proper form of a supporting construction stress, excavating sequences are divided
Control etc. is further improved and perfect there are more limitation.
In addition, mountain tunnel biggish for buried depth is for the weak surrounding rocks such as fault belt, especially horizontal stress
In biggish situation, lateral deformation, especially bottom heave deformation etc., current construction method and supporting knot how are prevented
Structure lacks clear effectively for measure, and referential construction experience is also very limited, corresponding technology measure also base
This is in space state, several particularly with regard to the method for tunnel construction under the high-ground stress geological conditions of earthquake zone braking effect
Do not have, construction is very big with technical measures difficulty.
Summary of the invention
To solve the above-mentioned problems, the main object of the present invention be to provide it is a kind of can prevent tunnel lateral deformation, bottom it is grand
Deformation is played, guarantees tunnel later period lining quality, and can effectively control big span, the security risk in large cross-section tunnel construction
Large cross-section tunnel excavation supporting structure.
In order to realize that the main object of the present invention, the present invention provide a kind of large cross-section tunnel excavation supporting structure, wherein packet
Include the first base tunnel supporting construction, the second base tunnel supporting construction, the first sidewall structure, the second sidewall structure, main hole top top bar
Step supporting construction and main hole lower part supporting construction in supporting construction, main hole top, the first base tunnel supporting construction include the first surpassing
Preceding ductule and the first first Zhi Danyuan, the first advanced tubule are set to the arch of the first base tunnel, and the first first Zhi Danyuan is set to
The inner wall of first base tunnel, along the longitudinal direction in tunnel, the first base tunnel partly overlaps with tunnel cross-section, and the second base tunnel supporting construction includes the
Two advanced tubules and the second first Zhi Danyuan, the second advanced tubule are set to the arch of the second base tunnel, and the second first Zhi Danyuan is set
It is placed in the inner wall of the second base tunnel, along the longitudinal direction in tunnel, the second base tunnel partly overlaps with tunnel cross-section, and the first sidewall structure is set to
In first base tunnel, the first sidewall structure is located at outside tunnel cross-section, the first sidewall structure and the first first branch cell abutment, the second side wall
In in the second base tunnel, the second sidewall structure is located at outside tunnel cross-section structure setting, and the second sidewall structure and the second first Zhi Danyuan are adjacent
It connects, main hole top top bar supporting construction includes middle Guan Peng, big limb ductule and third just Zhi Danyuan, middle Guan Peng, big limb
Ductule is all set in the arch of main hole top top bar, and the first Zhi Danyuan of third is set to the inner wall of main hole top top bar, main
Step supporting construction includes the 4th first Zhi Danyuan and the 5th just Zhi Danyuan in the top of hole, and the 4th first Zhi Danyuan is set to main hole top
The inner wall of first side of middle step, the 4th just Zhi Danyuan both ends respectively with the first end of the first sidewall structure, third at the beginning of Zhi Dan
The first end connection of member, the 5th first Zhi Danyuan are set to the inner wall of second side of step in main hole top, the 5th first Zhi Danyuan's
Both ends are connect with the second end of Zhi Danyuan at the beginning of the first end of the second sidewall structure, third respectively, and main hole lower part supporting construction includes
Anchor pole and the 6th just Zhi Danyuan, the autonomous hole lower part of anchor pole extend outwardly setting, Zhi Danyuan at the beginning of the 6th is set to the interior of main hole lower part
The both ends of wall, the 6th first Zhi Danyuan are connect with the second end of the second end of the first sidewall structure, the second sidewall structure respectively.
Therefore side wall is set in base tunnel, and is bonded side wall with the outer profile of tunnel cross-section, enable side wall
The stress load for receiving tunnel cross-section transmitting makes stress load to the wall of side wall and basis transfer, to guarantee that tunnel top is applied
The safety of work, and achieve the effect that the horizontal high-ground stress of resistance.In addition, side wall can also with during tunnel excavation to leading
Hole, main hole back-pressure backfill processing and short step excavation construction match, and make it possible to quickly fall the supporting of tunnel cross-section arch
Closed preliminary bracing structure is formed at the top of base tunnel and side wall, and with base tunnel, side wall, realize the transmitting of stress load and is turned
It moves.Furthermore the back-pressure backfill during base tunnel and the side wall cooperation wide open digging of tunnel master also can ensure that stress when mid-board excavates
Disperse to two sides base tunnel, so that back-pressure backfill part is formed monolithic stability structure with mid-board, greatly reduce side-stand type in base tunnel
Security risk when supporting steelframe is removed.In addition, base tunnel and side wall cooperation main hole lower part inverted arch excavate short step construction, Neng Goushi
Existing Rapid Excavation, quick closure are played by sidewall structure and inhibit inverted arch that protuberance deformation occurs, and solve tunnel cross-section poorly
Technical problem in matter.
Further embodiment is the L-shaped setting of the first sidewall structure, the second sidewall structure, the first sidewall structure, second
Sidewall structure is symmetrical set, the toe of wall of the first sidewall structure, the second sidewall structure toe of wall be oppositely arranged.
Further scheme is that the first sidewall structure includes first foundation steelframe, the first wall steelframe and the first coagulation
Soil structure, first foundation steelframe are fixedly connected with the first wall steelframe, and the first wall steelframe is connect with the 4th first Zhi Danyuan, and first
Basic steelframe is connect with the first end of the 6th first Zhi Danyuan, and the first concrete structure wraps up first foundation steelframe, the first wall steel
Frame；Second sidewall structure includes the second basic steelframe, the second wall steelframe and the second concrete structure, the second basic steelframe and the
Two wall steelframes are fixedly connected, and the second wall steelframe is connect with the 5th first Zhi Danyuan, the second basic steelframe and the 6th first Zhi Danyuan
Second end connection, the second concrete structure package second basic steelframe, the second wall steelframe.
Therefore by the structure setting to the first sidewall structure, the second sidewall structure so that the first sidewall structure and
Second sidewall structure can achieve the effect that the horizontal high-ground stress of resistance.
Further scheme is that the first first Zhi Danyuan includes the first arch steelframe, the first lock foot anchor tube, the second lock foot anchor
Pipe, the first side wall steelframe and second sidewall steelframe, the first arch steelframe are mounted on the arch of the first base tunnel, the first arch steelframe point
It is not fixedly connected with the first side wall steelframe, second sidewall steelframe, the first lock foot anchor tube is mounted on the first base tunnel far from tunnel cross-section
Side, second lock foot anchor tube is mounted on the first base tunnel close to the side of tunnel cross-section, the first side wall steelframe is mounted on first and leads
It cheats the side far from tunnel cross-section and is covered on the first lock foot anchor tube, second sidewall steelframe is mounted on the first base tunnel close to tunnel
The side of section is simultaneously covered on the second lock foot anchor tube；Second just Zhi Danyuan include the second arch steelframe, third lock foot anchor tube, the
Four lock foot anchor tubes, third side wall steelframe and the 4th side wall steelframe, the second arch steelframe are mounted on the arch of the second base tunnel, the second arch
Third side wall steelframe, the 4th side wall steelframe of portion's steelframe respectively are fixedly connected, and it is separate that third lock foot anchor tube is mounted on the second base tunnel
The side of tunnel cross-section, the 4th lock foot anchor tube are mounted on the second base tunnel close to the side of tunnel cross-section, the installation of third side wall steelframe
It in side of second base tunnel far from tunnel cross-section and is covered on third lock foot anchor tube, the 4th side wall steelframe is mounted on the second base tunnel
The side of close tunnel cross-section is simultaneously covered on the 4th lock foot anchor tube.
Further scheme is that the length that the first lock foot anchor tube, third lock foot anchor tube is 5 meters to 7 meters, the second lock foot anchor
The length that pipe, the 4th lock foot anchor tube is 2 meters to 4 meters.
Therefore by the structure setting to the first first first Zhi Danyuan of Zhi Danyuan and second, so that the first base tunnel and the
Two base tunnels are capable of forming stable force structure, guarantee the first base tunnel, the second base tunnel in itself digging process and later period tunnel
The safety of the excavation in the main hole in road,
Further scheme is that just Zhi Danyuan includes third arch steelframe to third, and third arch steelframe is mounted on main hole top
The arch of top bar, the both ends of third arch steelframe are respectively arranged with big arch springing structure, and third arch steelframe is covered in middle pipe
On canopy, big limb ductule,.
Further embodiment is that the 4th first Zhi Danyuan includes the 5th side wall steelframe, and the 5th side wall steelframe is mounted on main hole
The inner wall of first side of step in portion, and the 5th side wall steelframe first end with the first wall steelframe, third arch steelframe respectively
Connection；5th first Zhi Danyuan includes the 6th side wall steelframe, and the 6th side wall steelframe is mounted on second side of step in main hole top
Inner wall, and the 6th side wall steelframe is connect with the second end of the second wall steelframe, third arch steelframe respectively.
Therefore the first Zhi Danyuan of third, the 4th first first Zhi Danyuan of Zhi Danyuan and the 5th can cooperate short of main hole
Rank construction, and then realize Rapid Excavation, the quick closure in main hole, guarantee the construction speed and construction safety in tunnel.
Further scheme is that the 6th first Zhi Danyuan includes tunnel bottom steelframe, and tunnel bottom steelframe is mounted on the interior of main hole lower part
Wall, tunnel bottom steelframe is connect with first foundation steelframe, the second basic steelframe respectively, and tunnel bottom steelframe is covered on anchor pole, anchor pole
Length is 3 meters to 5 meters, and placing has concrete in anchor pole.
Therefore the setting of Zhi Danyuan at the beginning of the 6th is so that the circumferential preliminary bracing that tunnel formation is completed, guarantees tunnel
Overall stability.
Further scheme is, the first advanced tubule, the second advanced tubule are along the longitudinally disposed of tunnel, first
Advanced tubule, the second advanced tubule length be 2.5 meters to 4.5 meters, and the first advanced tubule, second advanced small lead
Placing has concrete in pipe.
Therefore the setting of advanced tubule can preferably control the deformation and sinking of base tunnel preliminary bracing, guarantee
The construction safety and construction quality of base tunnel.
Further scheme is that middle pipe canopy is 13 meters to 17 meters along the longitudinally disposed of tunnel, the length of middle pipe canopy, and in
Placing has concrete in pipe canopy, and normal of the big limb ductule along the arch of main hole upper step is arranged, big limb ductule
Length is 2 meters to 4 meters, and placing has concrete in big limb ductule.
Therefore the setting of middle Guan Peng, big limb ductule can preferably control Tunnel deformation and
Sink, guarantees the construction safety and construction quality in tunnel.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of large cross-section tunnel excavation supporting constructive embodiment of the present invention.
Fig. 2 is the construction signal of the top bar of the first base tunnel of large cross-section tunnel excavation supporting constructive embodiment of the present invention
Figure.
Fig. 3 is the construction signal of the first base tunnel of large cross-section tunnel excavation supporting constructive embodiment of the present invention got out of a predicament or an embarrassing situation
Figure.
Fig. 4 is the construction signal on the basis of the first sidewall structure of large cross-section tunnel excavation supporting constructive embodiment of the present invention
Figure.
Fig. 5 is the construction signal of the top bar of the second base tunnel of large cross-section tunnel excavation supporting constructive embodiment of the present invention
Figure.
Fig. 6 is the construction signal of the second base tunnel of large cross-section tunnel excavation supporting constructive embodiment of the present invention got out of a predicament or an embarrassing situation
Figure.
Fig. 7 is the construction signal on the basis of the second sidewall structure of large cross-section tunnel excavation supporting constructive embodiment of the present invention
Figure.
Fig. 8 is the wall of the first sidewall structure of large cross-section tunnel excavation supporting constructive embodiment of the present invention, the second side wall
The construction schematic diagram of the wall of structure.
Fig. 9 is the first base tunnel, the second base tunnel and tunnel core portion of large cross-section tunnel excavation supporting constructive embodiment of the present invention
Back-pressure backfill schematic diagram.
Figure 10 is the construction schematic diagram of the main hole top top bar of large cross-section tunnel excavation supporting constructive embodiment of the present invention.
Figure 11 is that first side of step is applied in the main hole top of large cross-section tunnel excavation supporting constructive embodiment of the present invention
Work schematic diagram.
Figure 12 is that second side of step is applied in the main hole top of large cross-section tunnel excavation supporting constructive embodiment of the present invention
Work schematic diagram.
Figure 13 is applying for the main hole top remaining core soil in advance excavation of large cross-section tunnel excavation supporting constructive embodiment of the present invention
Work schematic diagram.
Figure 14 is the schematic diagram constructed in the middle part of the main hole of large cross-section tunnel excavation supporting constructive embodiment of the present invention.
Figure 15 is the schematic diagram of the main hole lower part construction of large cross-section tunnel excavation supporting constructive embodiment of the present invention.
Figure 16 is the schematic diagram of the tunnel inverted arch construction of large cross-section tunnel excavation supporting constructive embodiment of the present invention.
Figure 17 is the schematic diagram of the tunnel double-lining construction of large cross-section tunnel excavation supporting constructive embodiment of the present invention.
The invention will be further described with reference to the accompanying drawings and embodiments.
Specific embodiment
Large cross-section tunnel excavation supporting structure provided by the invention can be used for in high-ground stress, broken weak surrounding rock etc.
The construction in the tunnel of bad geological section carries out excavation supporting, to prevent that lateral deformation, bottom heave occurs during constructing tunnel
The problems such as deformation, guarantee later period lining quality, and can effectively control big span, large cross-section tunnel construction in security risk.
Large cross-section tunnel excavation supporting structure of the present invention is illustrated below.
Referring to Fig.1, large cross-section tunnel excavation supporting structure includes the first base tunnel supporting construction 1, the second base tunnel supporting construction
2, the first sidewall structure 3, the second sidewall structure 4, main hole top top bar supporting construction 51, step supporting knot in the main hole top of tunnel
Structure and main hole lower part supporting construction 53.
Along the longitudinal direction in tunnel, the first base tunnel 10 partly overlaps with tunnel cross-section.First base tunnel supporting construction 1 includes the first surpassing
Preceding ductule 11 and the first first Zhi Danyuan 12.First advanced tubule 11 is set to the arch of the first base tunnel 10, and first is advanced small
Conduit 11 is along the longitudinally disposed of tunnel, and the length of the first advanced tubule 11 is 2.5 meters to 4.5 meters, and the first advanced tubule
Placing has concrete in 11.
First first Zhi Danyuan 12 is set to the inner wall of the first base tunnel 10, and specifically, the first first Zhi Danyuan 12 includes the first arch
Portion's steelframe 121, first locks foot anchor tube 122, second and locks foot anchor tube 123, the first side wall steelframe 124 and second sidewall steelframe 125.
First arch steelframe 121 is mounted on the arch of the first base tunnel 10, and the first arch steelframe 121 respectively with the first side wall
Steelframe 124, second sidewall steelframe 125 are fixedly connected.First lock foot anchor tube 122, the first side wall steelframe 124 are installed in first and lead
10 sides far from tunnel cross-section are cheated, and the first side wall steelframe 124 is covered on the first lock foot anchor tube 122.Second lock foot anchor tube
123, second sidewall steelframe 125 is installed in the first base tunnel 10 close to the side of tunnel cross-section, and second sidewall steelframe 125 covers
In on the second lock foot anchor tube 123.
Along the longitudinal direction in tunnel, the second base tunnel 20 partly overlaps with tunnel cross-section.Second base tunnel supporting construction 2 includes the second surpassing
Preceding ductule 21 and the second first Zhi Danyuan 22.Second advanced tubule 21 is set to the arch of the second base tunnel 20, and second is advanced small
Conduit 21 is along the longitudinally disposed of tunnel, and the length of the second advanced tubule 21 is 2.5 meters to 4.5 meters, and the second advanced tubule
Placing has concrete in 21.
Second first Zhi Danyuan 22 is set to the inner wall of the second base tunnel 20, and specifically, the second first Zhi Danyuan 22 includes the second arch
Portion's steelframe 221, third lock foot anchor tube the 222, the 4th lock foot anchor tube 223, third side wall steelframe 224 and the 4th side wall steelframe 225.
Second arch steelframe 221 is mounted on the arch of the second base tunnel 20, and the second arch steelframe 221 respectively with third side wall
Steelframe 224, the 4th side wall steelframe 225 are fixedly connected.Third lock foot anchor tube 222, third side wall steelframe 224 are installed in second and lead
20 sides far from tunnel cross-section are cheated, and third side wall steelframe 224 is covered on third lock foot anchor tube 222.4th lock foot anchor tube
223, the 4th side wall steelframe 224 is installed in the second base tunnel 20 close to the side of tunnel cross-section, and the 4th side wall steelframe 225 covers
In on the 4th lock foot anchor tube 223.
Wherein, it is 5 meters to 7 meters that the first lock foot anchor tube 122, third, which lock the length of foot anchor tube 222, the second lock foot anchor tube
123, the length of the 4th lock foot anchor tube 223 is 2 meters to 4 meters.
First sidewall structure 3 is set in the first base tunnel 10, and the first sidewall structure 3 is located at outside tunnel cross-section, and the first side
The first side wall steelframe 124 of wall construction 3 and the first first Zhi Danyuan 12 are adjacent.Specifically, the first sidewall structure 3 includes first foundation
Steelframe 31, the first wall steelframe 32 and the first concrete structure, first foundation steelframe 31 are fixedly connected with the first wall steelframe 32,
First wall steelframe 32 is connect with the 4th supporting unit 521 of step supporting construction in the main hole top of tunnel, first foundation steelframe 31
It is connect with the 6th supporting unit 532 of main hole lower part supporting construction 53, the first concrete structure wraps up 31 He of first foundation steelframe
First wall steelframe 32.
Second sidewall structure 4 is set in the second base tunnel 20, and the second sidewall structure 4 is located at outside tunnel cross-section, and second side
The third side wall steelframe 224 of wall construction 4 and the second first Zhi Danyuan 22 are adjacent.Specifically, the second sidewall structure 4 includes the second basis
Steelframe 41, the second wall steelframe 42 and the second concrete structure, the second basic steelframe 41 are fixedly connected with the second wall steelframe 42,
Second wall steelframe 42 is connect with the 5th supporting unit 522 of step supporting construction in the main hole top of tunnel, the second basic steelframe 41
It is connect with the 6th supporting unit 532 of main hole lower part supporting construction 53, the second concrete structure package 41 He of the second basic steelframe
Second wall steelframe 42.
In addition, the first sidewall structure 3, the L-shaped setting of the second sidewall structure 4, the first sidewall structure 3, the second side wall knot
Structure 4 is symmetrical set, and the toe of wall of the toe of wall of the first sidewall structure 3, the second sidewall structure 4 is oppositely arranged.
Main hole top top bar supporting construction 51 includes middle pipe canopy 511, big limb ductule 512 and third just Zhi Danyuan
513, wherein middle pipe canopy 511, big limb ductule 512 are all set in the arch of main hole top top bar 5011, the first Zhi Dan of third
Member 513 is set to the inner wall of main hole top top bar 5011.
Specifically, middle pipe canopy 511 is along the longitudinally disposed of tunnel, and the length of middle pipe canopy 511 is 13 meters to 17 meters, and middle pipe canopy
Placing has concrete in 511.Normal of the big limb ductule 512 along the arch of main hole top top bar 5011 is arranged, big limb
The length of ductule 512 is 2 meters to 4 meters, and placing has concrete in big limb ductule 512.
Just Zhi Danyuan 513 includes third arch steelframe to third, and third arch steelframe is mounted on main hole top top bar 5011
Arch, the both ends of third arch steelframe are respectively arranged with big arch springing structure 5132, and third arch steelframe is covered in middle pipe canopy
511, on big limb ductule 512.
Step supporting construction includes the 4th first first Zhi Danyuan 522 of Zhi Danyuan 521 and the 5th in the tunnel top Zhu Dong, at the beginning of the 4th
Zhi Danyuan 521 is set to the inner wall of the first side of step 5012 in main hole top, and the both ends of the 4th first Zhi Danyuan 521 are respectively with the
The first end connection of the first Zhi Danyuan 513 of first end, third of one sidewall structure 3, the 5th first Zhi Danyuan 522 are set to main hole top
The inner wall of second side of middle step 5012, the 5th just Zhi Danyuan 522 both ends respectively with the first end of the second sidewall structure 4, the
The second end connection of three first Zhi Danyuan 513.Specifically, the 4th first Zhi Danyuan 521 includes the 5th side wall steelframe, the 5th side wall steelframe
Be mounted on the inner wall of the first side of step 5012 in main hole top, and the 5th side wall steelframe respectively with the first wall steelframe 32,
The first end of three arch steelframes connects；5th first Zhi Danyuan 522 includes the 6th side wall steelframe, and the 6th side wall steelframe is mounted on main hole
The inner wall of second side of step 5012 in top, and the 6th side wall steelframe respectively with the second wall steelframe 42, third arch steelframe
Second end connection.
Main hole lower part supporting construction 53 include anchor pole 531 and the 6th just Zhi Danyuan 532, the autonomous hole lower part 503 of anchor pole 531 to
It is outer to be extended, the 6th just Zhi Danyuan 531 be set to the inner wall of main hole lower part 503, the 6th just Zhi Danyuan 531 both ends respectively with
The second end of first sidewall structure 3, the connection of the second end of the second sidewall structure 4.Specifically, the 6th first Zhi Danyuan 532 includes tunnel
Bottom steelframe, tunnel bottom steelframe are mounted on the inner wall of main hole lower part 503, and tunnel bottom steelframe is basic with first foundation steelframe 31, second respectively
Steelframe 32 connects, and tunnel bottom steelframe is covered on anchor pole 531, and the length of anchor pole 531 is 3 meters to 5 meters, and placing in anchor pole 531
There is concrete.
The work progress of large cross-section tunnel excavation supporting structure of the present invention is as follows：
Referring to Fig. 2 and Fig. 3, the first excavation with guide pit supporting includes：
When carrying out the construction of the first base tunnel 10, guarantee along tunnel longitudinal direction, the cross section of the first base tunnel 10 and tunnel cross-section holding part
Overlapping.Before the construction of the first base tunnel 10, the first advanced tubule 11 is set at the arch of the first base tunnel 10 and infused in pipe
Slurry, the first advanced tubule 11 is preferably using 3.5 meters long, also, the construction of the first advanced tubule 11 is longitudinally every along tunnel
2.4 meters are constructed one time, so that keeping overlapping between two longitudinally adjacent first advanced tubules 11 of tunnel.
Then, using weak blast excavate the first base tunnel 10 top bar 101, digging distance be less than or equal to two Pin steelframes away from
From spray at the beginning of carrying out concrete to scar after the completion of excavation, it is preferably 4 centimetres that concrete, which just sprays thickness,.Then, in top bar 101
Side far from tunnel cross-section applies the first lock foot anchor tube 122 and carries out slip casting in pipe, in top bar 101 close to tunnel cross-section
Construction the second lock foot anchor tube 123 in side simultaneously carries out slip casting in pipe.
Then, 101 part of top bar of the first side wall steelframe 124, second sidewall steelframe 125 is installed, specifically includes steel
Frame, reinforced mesh and connect reinforcing bar installation and be welded and fixed, then carry out concrete ejection concrete ejection thickness be preferably
25 centimetres, and keep it uniformly closely knit, form preliminary bracing.Wherein, the length of the first lock foot anchor tube 122 is preferably 6 meters, the second lock
The length of foot anchor tube 123 is preferably 3 meters.
102 are got out of a predicament or an embarrassing situation using what weak blast excavated the first base tunnel 10, and digging distance is less than or equal to two Pin steelframe distances, opens
It carries out concrete to scar after the completion of digging just to spray, it is preferably 4 centimetres that concrete, which just sprays thickness,.Then, 102 are being got out of a predicament or an embarrassing situation far from tunnel
The side of road section applies the first lock foot anchor tube 122 and carries out slip casting in pipe, 102 applies close to the side of tunnel cross-section getting out of a predicament or an embarrassing situation
Work second locks foot anchor tube 123 and carries out slip casting in pipe.
Then, the first side wall steelframe 124 is installed, 102 parts of getting out of a predicament or an embarrassing situation of second sidewall steelframe 125 specifically include steel
Frame, reinforced mesh and connect reinforcing bar installation and be welded and fixed, then carry out concrete ejection concrete ejection thickness be preferably
25 centimetres, and keep it uniformly closely knit, form preliminary bracing.When carrying out concrete ejection, need in bottom of getting out of a predicament or an embarrassing situation reserved the
The mode that dregs buries protection can be used in the position of the first foundation steelframe 31 of one sidewall structure 3, reservation mode.
Referring to Fig. 4, the foundation construction of the first base tunnel bottom anchor pole and the first sidewall structure includes：
Anchor pole is set in 102 bottoms of getting out of a predicament or an embarrassing situation outwardly and carries out slip casting in pipe, wherein 102 bottoms of getting out of a predicament or an embarrassing situation of the first base tunnel 10
Construction should lag behind top bar 101 and construct 30 meters to 50 meters.Then, the first foundation steelframe 31 of the first sidewall structure 3 is installed simultaneously
The basis for carrying out the first sidewall structure 3 pours.
Specifically, get out of a predicament or an embarrassing situation 102 bottoms setting anchor pole and carry out pig price lattice in pipe, rock-bolt length is preferably 4 meters.First
The installation of basic steelframe 31 includes installation side wall infrastructure steelframe, reinforced mesh and connects reinforcing bar, and firm welding, the first side
The basis of wall construction 3, which pours, preferably to be poured using C20 concrete.In addition, being poured on the basis for carrying out the first sidewall structure 3
When, reserve the connecting plate of first foundation steelframe 31.
Referring to Fig. 5 to Fig. 7, the basis of the second excavation with guide pit supporting, the second base tunnel bottom anchor pole and the second sidewall structure is applied
Work includes：
Specifically, before the construction of the second base tunnel 20, second advanced tubule 21 is set at the arch of the second base tunnel 20 and is constructed simultaneously
Carry out slip casting in pipe, the second advanced tubule 21 is preferably using 3.5 meters long, also, the construction of the second advanced tubule is along tunnel
Road is longitudinally constructed one time for every 2.4 meters, so that along tunnel longitudinally adjacent two towards keeping overlapping between ductule.
Then, using weak blast excavate the second base tunnel 2 top bar 201, digging distance be less than or equal to two Pin steelframes away from
From spray at the beginning of carrying out concrete to scar after the completion of excavation, it is preferably 4 centimetres that concrete, which just sprays thickness,.Then, in top bar 201
Two sides apply anchor pole respectively and carry out slip casting in pipe.Then, the steelframe, reinforced mesh and connection reinforcing bar, lock of top bar 201 are installed
Foot anchor tube, and firm welding is carried out, concrete ejection is then carried out, concrete ejection thickness is preferably 25 centimetres, and makes it
It is even closely knit, form preliminary bracing.
Then, the second base tunnel 22 get out of a predicament or an embarrassing situation 202 bottoms setting anchor pole and carry out slip casting in pipe, rock-bolt length is preferred
It is 4 meters.The installation of first foundation steelframe 41 includes installation side wall infrastructure steelframe, reinforced mesh and connection reinforcing bar, and is welded
Securely, the basis of the second sidewall structure 4, which pours, is preferably poured using C20 concrete.In addition, to the second sidewall structure 4
Basis when being poured, reserve the connecting plate of the second basic steelframe 41.
Referring to Fig. 8, the construction of the first wall, the construction of the second wall include：
Guarantee that the wall construction of the first sidewall structure 3 lags behind 9 meters to 15 meters of foundation construction of the first sidewall structure 3, installation the
First wall steelframe 32 of the one sidewall structure 3 and wall for carrying out the first sidewall structure 3 pours, the wall of the first sidewall structure 3
In the first base tunnel 10 and the outer profile for fitting in tunnel cross-section of the first sidewall structure 3.
Guarantee that the wall construction of the second sidewall structure 4 lags behind 9 meters to 15 meters of foundation construction of the second sidewall structure 4, pacifies
It fills the wall steelframe 42 of the second sidewall structure 4 and the wall for carrying out second side wall construction 4 pours, the wall of the second sidewall structure 4
In the second base tunnel 20 and the outer profile for fitting in tunnel cross-section of the second sidewall structure 4.
Specifically, the installation of the first wall steelframe 32 of the first sidewall structure 3 includes installation side wall arch, connects reinforcing bar,
And firm welding, the wall of the first sidewall structure 3, which pours, preferably to be poured using C20 concrete.The wall of second sidewall structure 4
The installation of body steelframe 42 includes installation side wall arch, connection reinforcing bar, and firm welding, the wall of the second sidewall structure 4 pour excellent
Choosing is poured using C20 concrete.
Then, after the completion of the wall of the first sidewall structure 3 pours, to progress coagulation at the top of the wall of the first sidewall structure 3
Native multiple spray closing, i.e., close the gap of the first base tunnel 10 and tunnel cross-section outer profile, in the wall of the first sidewall structure 3
Before top closed, operating space can be provided for construction personnel at the top of the wall of the first sidewall structure 3, construction personnel is existed
Operation is carried out at the top of the wall of first sidewall structure 3, when without at the top of the wall using the first sidewall structure 3, to first
Multiple spray closing is carried out at the top of the wall of sidewall structure 3 is able to carry out the top for eliminating the first sidewall structure 3 and tunnel cross-section foreign steamer
Wide spatial joint clearance guarantees the stress performance of the first sidewall structure 3.In addition, being carried out at the top of the wall to the first sidewall structure 3
When concrete sprays closing again, the connecting plate of the wall steelframe 31 of the first sidewall structure 3 is reserved.
Similarly, after the completion of the wall of the second sidewall structure 4 pours, the wall top of the second sidewall structure 4 is mixed
The solidifying multiple spray closing of soil, i.e., close the gap of the second base tunnel 20 and tunnel cross-section outer profile, in the wall of the second sidewall structure 4
Before body is top closed, operating space can be provided for construction personnel at the top of the wall of the second sidewall structure 4, enable construction personnel
Operation is carried out at the top of the wall of the second sidewall structure 4, when without at the top of the wall using the second sidewall structure 4, to the
Multiple spray closing is carried out at the top of the wall of two sidewall structures 4 to be able to carry out outside the top for eliminating the second sidewall structure 4 and tunnel cross-section
The spatial joint clearance of profile guarantees the stress performance of the second sidewall structure 4.In addition, being mixed at the top of the wall to the second wall 4
When the solidifying multiple spray of soil is closed, the connecting plate of the wall steelframe 41 of the second wall 4 is reserved.Wherein, the first sidewall structure 3, the second side wall
Structure 4 is anti-toe erect type Gravity Retaining Wall.
After the completion of the first base tunnel 1, the second base tunnel 2, the first sidewall structure 3 and the 4th side wall 4 are constructed, it can carry out
The wide open digging of tunnel cross-section master.Referring to Fig. 9 to Figure 13, main hole top construction includes：
Main 50 arch of hole is set and pays protection structure in advance, while back-pressure backfill is carried out to the first base tunnel 10, the second base tunnel 20 using hole slag,
If current construction section is non-first section, local hole slag back-pressure backfill is carried out to the tunnel core portion that adjacent segment has been excavated out, formation is applied
Work ramp.
Main 501 top bar 5011 of hole top is excavated using remaining core soil in advance, preliminary bracing.On main hole top 501
After 4 meters to 6 meters of 5011 drilling depth of step, 5,012 first side of step in main hole top 501 is excavated, is removed after the completion of excavation
The corresponding supporting construction in first base tunnel, 10 top and the preliminary bracing for carrying out 5,012 first side of step in main hole top 5.Preferably,
After main 5 meters of 501 top bar of hole top, 5011 drilling depth, carries out main 501 top bar 5011 of hole top and excavate.
5012 second side of step in main hole top 501 is excavated, 20 top of the second base tunnel is removed after the completion of excavation
Corresponding supporting construction and the preliminary bracing for carrying out 5012 second side of step in main hole top 501, step in main hole top 501
It excavates and is staggered 2 meters or more in 5012 two sides.
It lags behind on main hole, 5 meters to 10 meters of middle step construction, excavates main 501 remaining core soil in advance part of hole top, and opening
The first base tunnel 10, the 20 remaining corresponding supporting construction in top of the second base tunnel are removed after the completion of digging.
Specifically, before carrying out the main excavation of hole 50 in tunnel, to pipe canopy in the arch setting of main 501 top bar 5011 of hole top
511, big limb ductule 512 and slip casting in pipe is carried out, wherein middle 511 length of pipe canopy preferably uses 15 meters long, and big limb is small to lead
512 length of pipe preferably use it is 3 meters long, and along tunnel longitudinally it is every 2.4 meters construct one time.Meanwhile using hole slag to the first base tunnel 10,
Second base tunnel 20 carries out back-pressure backfill, and if current construction section when being non-first section, the tunnel core portion that adjacent segment has been excavated out into
Row part hole slag back-pressure backfill, wherein back-pressure backfill length is all larger than or is equal to 5 meters.
Then, using remaining core soil in advance annular excavation with guide pit, after main 501 top bar 5011 of hole top excavates 5 meters of drilling depth,
5012 two sides of step in main hole top 501 are carried out immediately to excavate, and are constructed according to every 5 meters one short step close segments, are completed one
Next 5 meters of sections circulation construction can be carried out after close segments.Main 501 top bar 5011 of hole top is excavated using weak blast, excavate away from
From being less than or equal to a distance from two Pin steelframes, concrete ejection is carried out to scar after the completion of excavation, concrete ejection thickness is preferably 4
Centimetre, the third arch steelframe 531 of the first Zhi Danyuan 513 of third is then installed, the installation of third arch steelframe 531 includes installation steel
Frame, reinforced mesh, connection reinforcing bar and lock foot anchor tube and firm welding.In addition, big arch springing is respectively set in the two sides of step steelframe
Structure 532.Then, concrete ejection is carried out, and uniformly closely knit, wherein concrete ejection thickness is preferably 27 centimetres.
After 5 meters of barricades circulation of main 501 top bar 5011 of hole top, to 5012 two sides of step in main hole top 501
It is excavated, and digging distance is less than or equal to two Pin steelframes, step 512 is staggered 2 meters or more in the left and right sides.
When excavation, 5,012 first side of step in main hole top 501 is excavated using weak blast, it is then split to dig out
Scar carries out concrete and just sprays, and it is preferably 4 centimetres that concrete, which just sprays thickness,.Then, the corresponding branch in 10 top of the first base tunnel is removed
Protection structure, and the 5th side wall steelframe of the 4th supporting unit 521 is installed, the installation of second sidewall steelframe 5211 includes installation steel
Frame, big arch springing structure, reinforced mesh, connection reinforcing bar and locking anchor tube, and be welded and fixed, wherein the two of the 5th side wall steelframe 521
The reserved company of first wall steelframe 32 of connecting plate, the first sidewall structure 3 that end is reserved with third arch steelframe first end respectively
Fishplate bar connection, and guarantee the precision of connection and the stability of connection.
5012 second side of step in main hole top 501 is excavated using weak blast, the subsequent split scar dug out into
Row concrete just sprays, and it is preferably 4 centimetres that concrete, which just sprays thickness,.Then, the 20 corresponding supporting construction in top of the second base tunnel is removed,
And the 6th side wall steelframe of the 5th supporting unit 522 is installed, the installation of the 6th side wall steelframe includes installation steelframe, big arch springing knot
Structure, reinforced mesh, connection reinforcing bar and locking anchor tube, and be welded and fixed, wherein encircle respectively with third at the both ends of the 6th side wall steelframe
The reserved connecting plate of the second end of portion's steelframe, the connecting plate that the second wall steelframe 32 of the second sidewall structure 4 is reserved are connected, and are protected
Demonstrate,prove the precision of connection and the stability of connection.
It lags behind on main hole 50,5 meters to 10 meters of middle step construction, excavates remaining core soil in advance part, and to the after excavation
One base tunnel 10, the 20 remaining supporting construction in top of the second base tunnel are removed, and the first base tunnel 10 of dismounting, the second base tunnel 20 are located at
The remaining steel frame construction at the top in tunnel cross-section.
Referring to Fig.1 4, in the middle part of main hole construction includes：
It lags behind main hole top 501 to construct 5 meters to 10 meters, excavate in the middle part of main hole 502 and synchronous excavate the first base tunnel 10, second leads
Backfill in hole 20, and the first base tunnel 10, the corresponding supporting construction of the second base tunnel 20 are removed after the completion of excavation.Wherein,
The height of backfill is concordant with step height in one base tunnel 10, the second base tunnel 20.
Referring to Fig.1 5, main hole lower part construction includes：
502 5 meters to 10 meters of construction in the middle part of main hole is lagged behind, main hole lower part 503 is excavated and synchronous excavate the first base tunnel 10, second lead
Backfill in hole 20, removes the first base tunnel 10, the corresponding supporting construction of the second base tunnel 20, and carry out tunnel after the completion of excavation
The preliminary bracing of tunnel bottom.
Specifically, main hole lower part 503 is excavated using weak blast, and guarantees that tunnel cross-section tunnel bottom digging distance is less than
Or it is equal to 3 meters, and it is synchronous when excavation to excavate the first base tunnel 10, the backfill in the second base tunnel 20, first is removed after the completion of excavation
Base tunnel 10, the corresponding supporting construction of the second base tunnel 20.Then, concrete is carried out to the tunnel bed rock face of main hole lower part 503 just to spray, mix
The just spray of solidifying soil is with a thickness of 4 centimetres.Then, make anchor pole towards tunnel bottom application and carry out slip casting in pipe, rock-bolt length is preferably 4 meters.Then,
The tunnel bottom steelframe and connection reinforcing bar of 6th supporting unit 532, and firm welding are installed, wherein the both ends of tunnel bottom steelframe respectively with
The connecting plate connection of the connecting plate of first foundation steelframe 31, the second basic steelframe 41, and guarantee connection precision and connection it is steady
Solidity.Then, concrete ejection is carried out, and uniformly closely knit, concrete ejection thickness is preferably 27 centimetres.
Referring to Fig.1 6, inverted arch construction in tunnel includes:
The binding of lining cutting reinforcing bar is carried out, concreting is carried out after installing to lining cutting reinforcing bar and inverted arch, wherein lining cutting reinforcing bar
For double steel bar, concrete preferably uses C35 concrete.
Inverted arch filling in tunnel, which is constructed, includes：
After the completion of the construction of tunnel inverted arch, inverted arch filling template is installed, and carry out inverted arch fill concrete and pour, concrete is preferably adopted
With C20 concrete.
Referring to Fig.1 7, tunnel double-lining construction includes：
After the completion of the filling construction of tunnel inverted arch, two lining template installations are carried out, and carry out tunnel double-lining concreting, two lining templates
Lining cutting reinforcing bar used is double steel bar, and concrete preferably uses C35 concrete.
To sum up, large cross-section tunnel excavation supporting structure and its construction method provided by the invention have the characteristics that：
First, the circumferential just branch steel arch-shelf multistage connection of tunnel cross-section, and from bottom to top to install, so that just branch steel arch-shelf installation
Quality of connection and connection precision between verticality, first branch steel arch-shelf can be effectively controlled, the stress after guaranteeing closure cyclization
Performance.
Second, by the setting to base tunnel structure and side wall, the interim steelframe of base tunnel side wall is enabled to follow main hole
Excavation synchronizes dismounting, improves construction efficiency.
Third, by the position setting of side wall and structure setting, so that side wall has the effect of resisting horizontal high-ground stress.
4th, excavated in base tunnel and tunnel cross-section arch and during supporting construction, using back-pressure base tunnel, back-pressure backfill and
The supporting of tunnel cross-section arch quickly can be fallen in base tunnel, side wall top, and shape by the form of construction work of short step quick closure landing
Integral closed just branch structure, to tunnel cross-section arch stress be shifted to the wall of side wall and basis, and then really
Protect tunnel top construction safety.
5th, the back-pressure backfill inside base tunnel also can ensure that stress disperses to two sides base tunnel when mid-board excavates, and makes back-pressure
A stable overall structure is formed between backfill part and mid-board, and greatly reduces gib steelframe on the inside of base tunnel and tears open
Except when security risk.
6th, main hole lower part inverted arch excavation supporting uses short step construction, and then realizes Rapid Excavation, quick closure, this
Outside, realizing in conjunction with the structure setting of side wall inhibits inverted arch that protuberance deformation occurs, to thoroughly solve in tunnel cross-section unfavorable geology
The technical problem of construction.
To sum up, side wall is set in base tunnel, and is bonded side wall with the outer profile of tunnel cross-section, side wall is received
The stress load of tunnel cross-section transmitting makes stress load to the wall of side wall and basis transfer, to guarantee the construction of tunnel top
Safety, and achieve the effect that the horizontal high-ground stress of resistance.In addition, side wall can also with during tunnel excavation to base tunnel, master
Hole back-pressure backfill processing and short step excavation construction match, and make it possible to that the supporting of tunnel cross-section arch is quickly fallen in base tunnel
With at the top of side wall, and closed preliminary bracing structure is formed with base tunnel, side wall, realize the transmitting and transfer of stress load.Furthermore
Back-pressure backfill during base tunnel and the side wall cooperation wide open digging of tunnel master also can ensure that stress is led to two sides when mid-board excavates
Hole dispersion makes back-pressure backfill part form monolithic stability structure with mid-board, greatly reduces side-stand type Support Steel frame in base tunnel
Security risk when dismounting.In addition, base tunnel and side wall cooperation main hole lower part inverted arch excavate short step construction, it can be realized and quickly open
It digs, quick closure, is played by sidewall structure and inhibit inverted arch that protuberance deformation occurs, solve skill of the tunnel cross-section in unfavorable geology
Art problem.
Finally it is emphasized that the above description is only a preferred embodiment of the present invention, it is not intended to restrict the invention, it is right
For those skilled in the art, the present invention can have various change and change, all within the spirits and principles of the present invention,
Any modification, equivalent substitution, improvement and etc. done, should all be included in the protection scope of the present invention.
Claims (10)
1. large cross-section tunnel excavation supporting structure, which is characterized in that including：
First base tunnel supporting construction, the first base tunnel supporting construction include the first advanced tubule and the first first Zhi Danyuan, institute
The arch that the first advanced tubule is set to the first base tunnel is stated, the described first first Zhi Danyuan is set to the interior of first base tunnel
Wall, along the longitudinal direction in tunnel, first base tunnel partly overlaps with tunnel cross-section；
Second base tunnel supporting construction, the second base tunnel supporting construction include the second advanced tubule and the second first Zhi Danyuan, institute
The arch that the second advanced tubule is set to the second base tunnel is stated, the described second first Zhi Danyuan is set to the interior of second base tunnel
Wall, along the longitudinal direction in tunnel, second base tunnel partly overlaps with the tunnel cross-section；
First sidewall structure, first sidewall structure are set in first base tunnel, and first sidewall structure is located at institute
It states outside tunnel cross-section, first sidewall structure and the described first first branch cell abutment；
Second sidewall structure, second sidewall structure are set in second base tunnel, and second sidewall structure is located at institute
It states outside tunnel cross-section, second sidewall structure and the described second first branch cell abutment；
Main hole top top bar supporting construction, the main hole top top bar supporting construction include middle Guan Peng, big limb ductule
With Zhi Danyuan at the beginning of third, the middle pipe canopy, the big limb ductule are all set in the arch of main hole top top bar, and described
Three first Zhi Danyuan are set to the inner wall of the main hole top top bar；
Step supporting construction in main hole top, step supporting construction includes the 4th just at the beginning of Zhi Danyuan and the 5th in the main hole top
Zhi Danyuan, the described 4th first Zhi Danyuan are set to the inner wall of the first side of step in main hole top, the described 4th first Zhi Danyuan's
Both ends are connect with the first end of Zhi Danyuan at the beginning of the first end of first sidewall structure, the third respectively, and the described 5th just props up
Unit is set to the inner wall of second side of step in the main hole top, and the both ends of the described 5th first Zhi Danyuan are respectively with described the
The second end connection of the first Zhi Danyuan of the first end of two sidewall structures, the third；
Main hole lower part supporting construction, the main hole lower part supporting construction include anchor pole and the 6th first Zhi Danyuan, and the anchor pole is autonomous
Hole lower part extends outwardly setting, the described 6th just Zhi Danyuan be set to the inner wall of the main hole lower part, the described 6th first Zhi Danyuan
Both ends connect respectively with the second end of the second end of first sidewall structure, second sidewall structure.
2. large cross-section tunnel excavation supporting structure according to claim 1, it is characterised in that：
First sidewall structure, the L-shaped setting of second sidewall structure；
First sidewall structure, second sidewall structure are symmetrical set；
The toe of wall of first sidewall structure and the toe of wall of second sidewall structure are oppositely arranged.
3. large cross-section tunnel excavation supporting structure according to claim 2, it is characterised in that：
First sidewall structure includes first foundation steelframe, the first wall steelframe and the first concrete structure, first base
Plinth steelframe is fixedly connected with the first wall steelframe, and the first wall steelframe is connect with the described 4th first Zhi Danyuan, described
First foundation steelframe is connect with the first end of the described 6th first Zhi Danyuan, and first concrete structure wraps up the first foundation
Steelframe, the first wall steelframe；
Second sidewall structure includes the second basic steelframe, the second wall steelframe and the second concrete structure, second base
Plinth steelframe is fixedly connected with the second wall steelframe, and the second wall steelframe is connect with the described 5th first Zhi Danyuan, described
Second basic steelframe is connect with the second end of the described 6th first Zhi Danyuan, the second concrete structure package second basis
Steelframe, the second wall steelframe.
4. large cross-section tunnel excavation supporting structure according to claim 3, it is characterised in that：
Described first just Zhi Danyuan include the first arch steelframe, first lock foot anchor tube, second lock foot anchor tube, the first side wall steelframe and
Second sidewall steelframe, first arch steelframe are mounted on the arch of first base tunnel, first arch steelframe respectively with
The first side wall steelframe, the second sidewall steelframe are fixedly connected, and the first lock foot anchor tube is mounted on first base tunnel
Side far from the tunnel cross-section, the second lock foot anchor tube are mounted on first base tunnel close to the one of the tunnel cross-section
Side, the first side wall steelframe are mounted on the side of first base tunnel far from the tunnel cross-section and are covered in first lock
On foot anchor tube, the second sidewall steelframe is mounted on first base tunnel close to the side of the tunnel cross-section and is covered in described
On second lock foot anchor tube；
Described second just Zhi Danyuan include the second arch steelframe, third lock foot anchor tube, the 4th lock foot anchor tube, third side wall steelframe and
4th side wall steelframe, second arch steelframe are mounted on the arch of second base tunnel, second arch steelframe respectively with
The third side wall steelframe, the 4th side wall steelframe are fixedly connected, and the third lock foot anchor tube is mounted on second base tunnel
Side far from the tunnel cross-section, the 4th lock foot anchor tube are mounted on second base tunnel close to the one of the tunnel cross-section
Side, the third side wall steelframe are mounted on the side of second base tunnel far from the tunnel cross-section and are covered in the third lock
On foot anchor tube, the 4th side wall steelframe is mounted on second base tunnel close to the side of the tunnel cross-section and is covered in described
On 4th lock foot anchor tube.
5. large cross-section tunnel excavation supporting structure according to claim 4, it is characterised in that：
It is 5 meters to 7 meters that the first lock foot anchor tube, the third, which lock the length of foot anchor tube,；
The second lock foot anchor tube, the described 4th length for locking foot anchor tube are 2 meters to 4 meters.
6. large cross-section tunnel excavation supporting structure according to claim 4, it is characterised in that：
Just Zhi Danyuan includes third arch steelframe to the third, and third arch steelframe is mounted on the main hole top top bar
Arch, the both ends of third arch steelframe are respectively arranged with big arch springing structure, and third arch steelframe is covered in institute
State pipe canopy, on the big limb ductule.
7. large cross-section tunnel excavation supporting structure according to claim 6, it is characterised in that：
Described 4th first Zhi Danyuan includes the 5th side wall steelframe, and the 5th side wall steelframe is mounted on step in the main hole top
The first side inner wall, and the 5th side wall steelframe respectively with the first wall steelframe, third arch steelframe
One end connection；
Described 5th first Zhi Danyuan includes the 6th side wall steelframe, and the 6th side wall steelframe is mounted on step in the main hole top
Second side inner wall, and the 6th side wall steelframe respectively with the second wall steelframe, third arch steelframe
The connection of two ends.
8. large cross-section tunnel excavation supporting structure according to claim 7, it is characterised in that：
Described 6th first Zhi Danyuan includes tunnel bottom steelframe, and tunnel bottom steelframe is mounted on the inner wall of the main hole lower part, the tunnel
Bottom steelframe is connect with the first foundation steelframe, the second basic steelframe respectively, and tunnel bottom steelframe is covered in the anchor
On bar；
The length of the anchor pole is 3 meters to 5 meters, and placing has concrete in the anchor pole.
9. large cross-section tunnel excavation supporting structure according to any one of claims 1 to 8, it is characterised in that：
Along the longitudinally disposed of tunnel, described first advanced small is led for first advanced tubule, second advanced tubule
Pipe, second advanced tubule length be 2.5 meters to 4.5 meters, and it is first advanced tubule, described second advanced
Equal placing has concrete in ductule.
10. large cross-section tunnel excavation supporting structure according to claim 9, it is characterised in that：
The middle pipe canopy is 13 meters to 17 meters, and fills in the middle pipe canopy along the longitudinally disposed of tunnel, the length of the middle pipe canopy
Concrete is built；
Normal of the big limb ductule along the arch of the main hole upper step is arranged, the length of the big limb ductule
It is 2 meters to 4 meters, and placing has concrete in the big limb ductule.
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| CN111119928A (en) * | 2019-12-27 | 2020-05-08 | 浙江正方交通建设有限公司 | Novel tunnel primary support structure and construction method |
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