CN107288653A - A kind of the benching tunnelling method excavation supporting structure of weak surrounding rock large cross-section tunnel double -side approach three and construction method - Google Patents
A kind of the benching tunnelling method excavation supporting structure of weak surrounding rock large cross-section tunnel double -side approach three and construction method Download PDFInfo
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- CN107288653A CN107288653A CN201710501927.7A CN201710501927A CN107288653A CN 107288653 A CN107288653 A CN 107288653A CN 201710501927 A CN201710501927 A CN 201710501927A CN 107288653 A CN107288653 A CN 107288653A
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- 238000010276 construction Methods 0.000 title claims abstract description 52
- 238000009412 basement excavation Methods 0.000 title claims abstract description 49
- 239000011435 rock Substances 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 51
- 239000010959 steel Substances 0.000 claims description 51
- 230000003111 delayed effect Effects 0.000 claims description 18
- 230000003014 reinforcing effect Effects 0.000 claims description 10
- 238000007569 slipcasting Methods 0.000 claims description 10
- 239000002689 soil Substances 0.000 claims description 10
- 238000004880 explosion Methods 0.000 claims description 9
- 238000004873 anchoring Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 5
- 238000007363 ring formation reaction Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 abstract description 3
- 238000003825 pressing Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 2
- 238000004904 shortening Methods 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
A kind of extrusion pressing type weak surrounding rock large section short tunnel excavation supporting structure and construction method, structure include top supporting, middle part supporting and bottom supporting from top to bottom, and top supporting includes left side wall base tunnel supporting（1）, mid-board supporting（3）With right side wall base tunnel supporting（2）, middle part supporting include left step supporting（4）With step supporting in the right side（5）, bottom supporting include lower-left step supporting（6）With bottom right step supporting（7）；Method includes following step：Left side wall base tunnel supporting（1）Excavation construction, right side wall base tunnel supporting（2）Excavation construction, mid-board supporting（3）Excavation construction, the construction of middle part supporting excavation, the construction of bottom supporting excavation.The strong sinking for having resisted arch country rock, has ensured the safety of construction, while shortening anchor cable applies the time, has saved engineering material.
Description
Technical field
The present invention relates to a kind of tunnel support structure and construction method, more specifically to a kind of weak surrounding rock big cross section
The benching tunnelling method excavation supporting structure of tunnel and Double side wall drift three and construction method, belong to technical field of tunnel construction.
Background technology
During big cross section Modelling of Tunnel Excavation in Soft Rock, traditional excavation method is CRD methods, two side-wall pilot tunnel etc..
These traditional excavation methods tend to obtain good effect in terms of excavation safety, control deformation is ensured；But temporary support compared with
It is many, and tear support difficulty open, construction risk is big, and working space is narrow and small, and construction speed is slow, and construction cost is higher.
The content of the invention
It is an object of the invention to deposited for existing Support System in Soft Rock Tunnels preliminary bracing structure in the presence of high-ground stress
There is provided a kind of extrusion pressing type weak surrounding rock large section is short the problems such as construction risk is larger, later stage lining quality is difficult to ensure
Tunnel excavation support structure and construction method.
To achieve the above object, technical solution of the invention is：A kind of weak surrounding rock large cross-section tunnel double side wall is led
Cheat three bench excavation supporting construction, including top supporting, middle part supporting and bottom supporting from top to bottom, described top supporting
Including the supporting of left side wall base tunnel, mid-board supporting and right side wall base tunnel supporting, described middle part supporting includes left step supporting
With step supporting in the right side, described bottom supporting includes lower-left step supporting and bottom right step supporting, described left side wall base tunnel
Supporting and the supporting of right side wall base tunnel include steel arch-shelf I and temporary support respectively, and described steel arch-shelf I is provided with the advanced He of conduit I
Radial grouting pipe I is provided between reinforced mesh I, steel arch-shelf I, described mid-board supporting includes steel arch-shelf II, described steel
It is provided with bow member II between advanced conduit II and reinforced mesh II, steel arch-shelf II and is provided with radial grouting pipe II, a described left side
Step supporting includes being provided with reinforced mesh III, steel on steel arch-shelf III, described steel arch-shelf III respectively in middle step supporting and the right side
Radial grouting pipe III is provided between bow member III, described lower-left step supporting and bottom right step supporting include steel arch-shelf respectively
IV, radial grouting pipe IV is provided between steel arch-shelf III.
The just long anchor of branch prestressing force is respectively arranged with the outside of described left side wall base tunnel supporting and on the outside of the supporting of right side wall base tunnel
Rope and side wall prestressing force long anchor cable.
A kind of construction method of the benching tunnelling method excavation supporting structure of weak surrounding rock large cross-section tunnel double -side approach three, including under
The step of face：Step one, left side wall base tunnel supporting excavation is constructed：Left side wall base tunnel is excavated using micro-explosion first and is no more than 2 Pin
Steelframe distance, then installs steel arch-shelf I and closes cyclization with temporary support；Reinforced mesh I and threaded connection reinforcing bar are then installed, and
Welding is firm, then applies the advanced conduit I of 4m length and radial grouting pipe I, and slip casting is full；Then the thick concrete of injection 30cm, makes
It is uniform closely knit；Then in time by the first branch prestressing force long anchor cables of 12m and 18m on the outside of design attitude construction left side wall base tunnel supporting
Side wall prestressing force long anchor cable locking, quincuncial arrangement, and slip casting, tensioning, anchoring are in place, make the 12m just branch prestressing force long anchor cables
Design strength, the 70% of 18m sides wall prestressing force long anchor cable tensioning overall strength are stretched to step by step；Step 2, right side wall base tunnel supporting
Excavation construction：The delayed left side wall base tunnel 10m of right side wall excavation with guide pit, it is used and left side wall base tunnel identical supporting in step one
Measure and step；Step 3, the construction of mid-board supporting excavation：Mid-board excavates delayed left side wall base tunnel 20m, is torn open first before excavating
Except anchorage, the anchor pad of the side wall prestressing force long anchor cable on the outside of left side wall base tunnel supporting in the range of excavation and right side wall base tunnel supporting
Plate, releases anchoring, then using micro-explosion, excavates mid-board and is no more than 2 Pin steelframe distances, and will be exposed because mid-board is excavated
The side wall prestressing force long anchor cable on the outside of the supporting of left side wall base tunnel and right side wall base tunnel supporting come arranges neat, installs steel arch-shelf II
It is firm to be docked with left and right sidewall steel arch-shelf I, then installs reinforced mesh II and threaded connection reinforcing bar, and welds firm, Ran Houshi
Make the advanced conduit II of 4m length and radial grouting pipe II, and slip casting is full, fill-before-fire 30cm thickness concrete, makes it uniform closely knit；Connect
And cut off the lateral wall prestressing force long anchor cable additional length of median septum steel arch-shelf II, and 18m sides wall prestressing force long anchor cable is entered in time
Row mends slurry, two times tensioning, and whole intensity of tensioning 18m sides wall prestressing force long anchor cable length are finally removed this section of left and right sidewall and faced
When side wall and interim inverted arch；Step 4, the construction of middle part supporting excavation：The middle delayed left side wall base tunnel 25m of bench excavation, middle step core
Cubsoil excavates delayed left side wall base tunnel 30m, using micro-explosion, left step supporting and it is right in step supporting stagger two Pin and middle
Driving is no more than 2 Pin steelframe distances to rank Core Soil forward simultaneously, then installs steel arch-shelf III and docks jail with top bar steel arch-shelf I
Lean on, reinforced mesh III and threaded connection reinforcing bar are then installed, and weld firm, then apply 4m length radial directions Grouting Pipe III, and note
Slurry is full, fill-before-fire 30cm thickness concrete, makes it uniform closely knit；Step 5, the construction of bottom supporting excavation：Excavation of getting out of a predicament or an embarrassing situation is delayed
Left side wall base tunnel 30m, Core Soil of getting out of a predicament or an embarrassing situation excavates delayed left side wall base tunnel 35m, and it is used and middle step identical in step 4
Supporting measure and step.
Compared with prior art, the beneficial effects of the invention are as follows：
1st, construction space is big, is conducive to personnel's plant equipment to deploy, can many scope of operation parallel constructions, construction efficiency height.
2nd, it is simple in construction, gib quantity is substantially reduce the number, gib is accordingly reduced and removes quantity, saved work
Cheng Chengben, improves efficiency of construction, high financial profit.
3rd, side wall prestressing force long anchor cable intersects to mid-board supporting and locked, and has both controlled the supporting of left side wall base tunnel and right side wall
The deformation of base tunnel supporting, has ensured the safety of mid-board supporting excavation again.
4th, intersect the side wall prestressing force long anchor cable that locks using mid-board and prop up two times tensioning at the beginning of arch, arch is improved rapidly
The intensity of portion's supporting, has effectively resisted the sinking of arch country rock, has ensured the safety of construction, while when shortening anchor cable and applying
Between, save engineering material.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention.
In figure, left side wall base tunnel supporting 1, mid-board supporting 3, right side wall base tunnel supporting 2, left step supporting 4, You Zhongtai
Rank supporting 5, lower-left step supporting 6, bottom right step supporting 7, first branch prestressing force long anchor cable 8, side wall prestressing force long anchor cable 9, temporarily
Side wall 10, interim inverted arch 11, middle step Core Soil 12, Core Soil 13 of getting out of a predicament or an embarrassing situation.
Embodiment
Below in conjunction with brief description of the drawings, the present invention is described in further detail with embodiment.
Referring to Fig. 1, a kind of bench excavation supporting construction of weak surrounding rock large cross-section tunnel double -side approach three, it is adaptable to weak
Country rock big cross section rapid construction, it includes top supporting, middle part supporting and bottom supporting from top to bottom.
Referring to Fig. 1, described top supporting includes left side wall base tunnel supporting 1, mid-board supporting 3 and right side wall base tunnel supporting
2, step supporting 5 during described middle part supporting includes left step supporting 4 and be right, described bottom supporting includes lower-left step branch
Shield 6 and bottom right step supporting 7.Described left side wall base tunnel supporting 1 and right side wall base tunnel supporting 2 include steel arch-shelf I and faced respectively
When support, described steel arch-shelf I is provided between advanced conduit I and reinforced mesh I, steel arch-shelf I and is provided with radial grouting pipe I,
And it is injected with concrete in left side wall base tunnel supporting 1 and right side wall base tunnel supporting 2.Described mid-board supporting 3 includes steel arch-shelf
II, it is provided between advanced conduit II and reinforced mesh II, steel arch-shelf II on described steel arch-shelf II and is provided with radial grouting pipe
Concrete is injected with II, and mid-board supporting 3.Step supporting 5 includes steel arch respectively in described left step supporting 4 and the right side
It is provided with frame III, described steel arch-shelf III between reinforced mesh III, steel arch-shelf III and is provided with radial grouting pipe III；And left
In rank supporting 4 and the right side concrete is injected with step supporting 5.Described lower-left step supporting 6 and bottom right step supporting 7 is wrapped respectively
Include and be provided with radial grouting pipe IV between steel arch-shelf IV, steel arch-shelf III；And sprayed in lower-left step supporting 6 and bottom right step supporting 7
Concrete is penetrated.
Referring to Fig. 1, further, the described outside of left side wall base tunnel supporting 1 and the outside of right side wall base tunnel supporting 2 is set respectively
It is equipped with just branch prestressing force long anchor cable 8 and side wall prestressing force long anchor cable 9.
Referring to Fig. 1, a kind of construction party of the benching tunnelling method excavation supporting structure of weak surrounding rock large cross-section tunnel double -side approach three
Method, including following step：
Step one, the excavation construction of left side wall base tunnel supporting 1：Left side wall base tunnel is excavated using micro-explosion first；Drilling depth is excavated in control
No more than 2 Pin steelframe distances.Then steel arch-shelf I is installed and closes cyclization with temporary support.The reinforced mesh I of Ф 8 and Ф are then installed
22 threaded connection reinforcing bars, and weld firm.The advanced conduit I of 4m length and radial grouting pipe I are applied again, and slip casting is full.Then spray
30cm thickness C25 concrete is penetrated, makes it uniform closely knit.Then in time by the 12m in the outside of design attitude construction left side wall base tunnel supporting 1
First branch prestressing force long anchor cable 8 and 18m sides wall prestressing force long anchor cable 9 lock, quincuncial arrangement, and slip casting, tensioning, anchoring are in place；
Making the 12m, just branch prestressing force long anchor cable 8 is stretched to design strength step by step, 18m sides 9 tensioning overall strengths of wall prestressing force long anchor cable
70%。
Step 2, the excavation construction of right side wall base tunnel supporting 2：The delayed left side wall base tunnel 10m of right side wall excavation with guide pit, it is used
With left side wall base tunnel identical supporting measure and step in step one.
Step 3, the excavation construction of mid-board supporting 3：Mid-board excavates delayed left side wall base tunnel 20m, is removed first before excavating
Anchorage, the anchor pad of the side wall prestressing force long anchor cable 9 in left side wall base tunnel supporting 1 and the outside of right side wall base tunnel supporting 2 in the range of excavation
Plate, releases anchoring.Then using micro-explosion excavate mid-board, control excavate drilling depth be no more than 2 Pin steelframe distances, and will because in every
Wall excavates the left side wall base tunnel supporting 1 being exposed and the side wall prestressing force long anchor cable 9 in the outside of right side wall base tunnel supporting 2 is finished
Whole, it is firm that installation steel arch-shelf II is docked with left and right sidewall steel arch-shelf I.Then the reinforced mesh II of Ф 8 is installed and Ф 22 is threadedly coupled
Reinforcing bar, and weld firm.Then the advanced conduit II of 4m length and radial grouting pipe II are applied, and slip casting is full.Fill-before-fire 30cm is thick
C25 concrete, makes it uniform closely knit.Then the additional length of II lateral wall prestressing force long anchor cable of median septum steel arch-shelf 9 is cut off.And and
When benefit slurry, two times tensioning, the whole of the length of tensioning 18m sides wall prestressing force long anchor cable 9 are carried out to 18m sides wall prestressing force long anchor cable 9
Intensity.Finally remove the interim side wall of this section of left and right sidewall and interim inverted arch.
Step 4, the construction of middle part supporting excavation：The middle delayed left side wall base tunnel 25m of bench excavation, middle step Core Soil 12 is opened
Delayed left side wall base tunnel 30m is dug, using micro-explosion, step supporting 5 in left step supporting 4 and the right side）Stagger two Pin and middle step
Core Soil 12 is tunneled forward simultaneously, and control excavates drilling depth and is no more than 2 Pin steelframe distances.Then steel arch-shelf III and top bar steel are installed
It is firm that bow member I is docked.The reinforced mesh III of Ф 8 and the threaded connection reinforcing bars of Ф 22 are then installed, and weld firm.Then 4m length is applied
Radial grouting pipe III, and slip casting is full；Fill-before-fire 30cm thickness C25 concrete, makes it uniform closely knit.
Step 5, the construction of bottom supporting excavation：Got out of a predicament or an embarrassing situation the delayed left side wall base tunnel 30m of excavation, and Core Soil 13 of getting out of a predicament or an embarrassing situation is opened
Delayed left side wall base tunnel 35m is dug, it is used and middle step identical supporting measure and step in step 4.
This kind of extrusion pressing type weak surrounding rock large section short tunnel excavation supporting structure and its construction method and tradition CRD
The branch such as method, two side-wall pilot tunnel construction method is compared, and has been given full play to the strong locking of side wall prestressing force long anchor cable 9 and has been made
With offside wall prestressing force long anchor cable 9 is segmented, two times tensioning, flexible, rapid construction, and its support reinforcement body ensures the peace of construction
Entirely.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to assert
The specific implementation of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of not departing from present inventive concept, some simple deduction or replace can also be made, said structure should be all considered as belonging to
Protection scope of the present invention.
Claims (3)
1. a kind of bench excavation supporting construction of weak surrounding rock large cross-section tunnel double -side approach three, it is characterised in that：Including by upper
And under top supporting, middle part supporting and bottom supporting, described top supporting includes left side wall base tunnel supporting（1）, mid-board
Supporting（3）With right side wall base tunnel supporting（2）, described middle part supporting includes left step supporting（4）With step supporting in the right side
（5）, described bottom supporting includes lower-left step supporting（6）With bottom right step supporting（7）, described left side wall base tunnel supporting
（1）With right side wall base tunnel supporting（2）Include steel arch-shelf I and temporary support respectively, described steel arch-shelf I is provided with advanced conduit I
With reinforced mesh I, radial grouting pipe I, described mid-board supporting are provided between steel arch-shelf I（3）It is described including steel arch-shelf II
Steel arch-shelf II on be provided between advanced conduit II and reinforced mesh II, steel arch-shelf II and be provided with radial grouting pipe II, it is described
Left step supporting（4）With step supporting in the right side（5）Include being provided with reinforcing bar on steel arch-shelf III, described steel arch-shelf III respectively
Radial grouting pipe III, described lower-left step supporting are provided between mesh sheet III, steel arch-shelf III（6）With bottom right step supporting（7）
Include being provided with radial grouting pipe IV between steel arch-shelf IV, steel arch-shelf III respectively.
2. a kind of bench excavation supporting construction of weak surrounding rock large cross-section tunnel double -side approach three according to claim 1,
It is characterized in that：Described left side wall base tunnel supporting（1）Outside and right side wall base tunnel supporting（2）It is pre- that outside is respectively arranged with just branch
Stress long anchor cable（8）With side wall prestressing force long anchor cable（9）.
3. a kind of construction method of the benching tunnelling method excavation supporting structure of weak surrounding rock large cross-section tunnel double -side approach three, its feature exists
In, including following step：
Step one, left side wall base tunnel supporting（1）Excavation construction：Left side wall base tunnel is excavated using micro-explosion first and is no more than 2 Pin steel
Frame distance, then installs steel arch-shelf I and closes cyclization with temporary support；Reinforced mesh I and threaded connection reinforcing bar are then installed, and welded
Connect firm, then apply the advanced conduit I of 4m length and radial grouting pipe I, and slip casting is full；Then the thick concrete of injection 30cm, makes it
It is uniform closely knit；Then in time by design attitude construction left side wall base tunnel supporting（1）The first branch prestressing force long anchor cables of the 12m in outside（8）
With 18m sides wall prestressing force long anchor cable（9）Locking, quincuncial arrangement, and slip casting, tensioning, anchoring are in place, branch at the beginning of making the 12m in advance should
Power long anchor cable（8）Design strength, 18m sides wall prestressing force long anchor cable are stretched to step by step（9）The 70% of tensioning overall strength；
Step 2, right side wall base tunnel supporting（2）Excavation construction：The delayed left side wall base tunnel 10m of right side wall excavation with guide pit, its use with
Left side wall base tunnel identical supporting measure and step in step one；
Step 3, mid-board supporting（3）Excavation construction：Mid-board excavates delayed left side wall base tunnel 20m, removes and opens first before excavating
Left side wall base tunnel supporting in the range of digging（1）With right side wall base tunnel supporting（2）The side wall prestressing force long anchor cable in outside（9）Anchorage,
Anchor plate, releases anchoring, then using micro-explosion, excavates mid-board and is no more than 2 Pin steelframe distances, and will be excavated cruelly because of mid-board
The left side wall base tunnel supporting exposed（1）With right side wall base tunnel supporting（2）The side wall prestressing force long anchor cable in outside（9）Finish
Whole, it is firm that installation steel arch-shelf II is docked with left and right sidewall steel arch-shelf I, then installs reinforced mesh II and threaded connection reinforcing bar, and
Welding is firm, then applies the advanced conduit II of 4m length and radial grouting pipe II, and slip casting is full, fill-before-fire 30cm thickness concrete,
Make it uniform closely knit；Then the lateral wall prestressing force long anchor cable of median septum steel arch-shelf II is cut off（9）Additional length, and in time to 18m
Side wall prestressing force long anchor cable（9）Carry out benefit slurry, two times tensioning, tensioning 18m sides wall prestressing force long anchor cable（9）The whole of length is strong
Degree, finally removes the interim side wall of this section of left and right sidewall and interim inverted arch；
Step 4, the construction of middle part supporting excavation：The middle delayed left side wall base tunnel 25m of bench excavation, middle step Core Soil（12）Excavate
Delayed left side wall base tunnel 30m, using micro-explosion, left step supporting（4）With step supporting in the right side（5）Stagger two Pin and middle step
Core Soil（12）Driving is no more than 2 Pin steelframe distances forward simultaneously, then installs steel arch-shelf III and docks jail with top bar steel arch-shelf I
Lean on, reinforced mesh III and threaded connection reinforcing bar are then installed, and weld firm, then apply 4m length radial directions Grouting Pipe III, and note
Slurry is full, fill-before-fire 30cm thickness concrete, makes it uniform closely knit；
Step 5, the construction of bottom supporting excavation：Get out of a predicament or an embarrassing situation the delayed left side wall base tunnel 30m of excavation, Core Soil of getting out of a predicament or an embarrassing situation（13）Excavate
Delayed left side wall base tunnel 35m, it is used and middle step identical supporting measure and step in step 4.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710501927.7A CN107288653B (en) | 2017-06-27 | 2017-06-27 | Double-side-wall pilot tunnel three-step excavation supporting structure for weak surrounding rock large-section tunnel and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710501927.7A CN107288653B (en) | 2017-06-27 | 2017-06-27 | Double-side-wall pilot tunnel three-step excavation supporting structure for weak surrounding rock large-section tunnel and construction method |
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| CN107288653A true CN107288653A (en) | 2017-10-24 |
| CN107288653B CN107288653B (en) | 2023-04-14 |
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| CN108166979A (en) * | 2017-12-01 | 2018-06-15 | 长安大学 | A kind of construction method of super-span tunnel top bar two side-wall pilot tunnel |
| CN108397205A (en) * | 2018-03-05 | 2018-08-14 | 北京市政建设集团有限责任公司 | A kind of shield well transverse passage-way CRD method construction methods |
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| CN111022060A (en) * | 2019-12-26 | 2020-04-17 | 中交三公局第二工程有限公司 | Single-hole excavation construction method of double-arch tunnel |
| CN111502675A (en) * | 2020-04-29 | 2020-08-07 | 中国矿业大学(北京) | Supporting method for construction of high-ground-stress weak broken surrounding rock large-section tunnel intersection |
| CN111912307A (en) * | 2020-07-23 | 2020-11-10 | 中交上海航道局有限公司 | Blasting excavation method of V-level surrounding rock large-section granite tunnel |
| CN112343601A (en) * | 2019-08-07 | 2021-02-09 | 林晓 | Full-section construction method for high-speed railway tunnel based on V-level surrounding rock complex geology |
| CN112343629A (en) * | 2019-08-07 | 2021-02-09 | 高军 | Advanced support method for complex geological tunnel |
| CN113513347A (en) * | 2021-08-06 | 2021-10-19 | 招金矿业股份有限公司 | Two-step filling method for supporting |
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| CN111912307B (en) * | 2020-07-23 | 2022-09-09 | 中交上海航道局有限公司 | Blasting excavation method for V-level surrounding rock large-section granite tunnel |
| CN111912307A (en) * | 2020-07-23 | 2020-11-10 | 中交上海航道局有限公司 | Blasting excavation method of V-level surrounding rock large-section granite tunnel |
| CN113513347A (en) * | 2021-08-06 | 2021-10-19 | 招金矿业股份有限公司 | Two-step filling method for supporting |
| CN113513347B (en) * | 2021-08-06 | 2024-05-07 | 招金矿业股份有限公司 | Two-step filling method supporting method |
| CN114086983A (en) * | 2021-11-23 | 2022-02-25 | 四川公路桥梁建设集团有限公司 | Combined reinforcing system for weak medium rock wall of extra-large-section branch tunnel |
| CN114086983B (en) * | 2021-11-23 | 2023-08-15 | 四川公路桥梁建设集团有限公司 | Combined reinforcing system for weak middle rock wall of super-large section bifurcation tunnel |
| CN115163084A (en) * | 2022-07-22 | 2022-10-11 | 中交（广州）建设有限公司 | Mechanical construction method for ultra-large section tunnel by double-side-wall pit guiding method |
| CN115420160A (en) * | 2022-09-22 | 2022-12-02 | 中铁十八局集团有限公司 | Blast hole arrangement structure for blasting of rheological weak surrounding rock tunnel and construction method |
| CN115420160B (en) * | 2022-09-22 | 2023-11-17 | 中铁十八局集团有限公司 | Blasthole arrangement structure for blasting rheological weak surrounding rock tunnel and construction method |
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