CN106437749B - A kind of tunnel and Double branch hole ripping construction method - Google Patents
A kind of tunnel and Double branch hole ripping construction method Download PDFInfo
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- CN106437749B CN106437749B CN201610741465.1A CN201610741465A CN106437749B CN 106437749 B CN106437749 B CN 106437749B CN 201610741465 A CN201610741465 A CN 201610741465A CN 106437749 B CN106437749 B CN 106437749B
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- 238000010276 construction Methods 0.000 title claims abstract description 31
- 239000011435 rock Substances 0.000 claims abstract description 27
- 239000004567 concrete Substances 0.000 claims abstract description 20
- 238000009412 basement excavation Methods 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 8
- 239000011378 shotcrete Substances 0.000 claims abstract description 8
- 239000010959 steel Substances 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 7
- 230000009194 climbing Effects 0.000 claims description 3
- 238000007569 slipcasting Methods 0.000 claims description 3
- 210000005239 tubule Anatomy 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims 1
- 238000005553 drilling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
A kind of tunnel and Double branch hole ripping construction method, includes the following steps：Preparation of construction is staggered and carries out branch hole（2）With lower branch hole（3）Excavation supporting, in lower branch hole（3）With main tunnel（4）Intersection erects gate steelframe, upper branch hole（2）It caunches and enters main tunnel（4）Top erects main tunnel（4）Preliminary bracing steelframe, the gunite concrete on top are closed, again to upper branch hole（2）Caunch top and main tunnel（4）It is partly backfilled between top preliminary bracing steelframe, sets up main tunnel（4）Profile steel frame sets anchor pole locking, gunite concrete closing, lower branch hole（3）Into main tunnel（4）Main tunnel is excavated in lower part（4）Top to lower branch hole（3）Through main tunnel（4）Position forms circumferential steelframe support, completes the construction of big cross section weak surrounding rock.Reduce the risk of caving in weak surrounding rock geology section large span section tunnel.
Description
Technical field
The present invention relates to a kind of method for tunnel construction, the double branch holes of more specifically to a kind of weak surrounding rock Large span tunnel are chosen
Construction method is pushed up, technical field of tunnel construction is belonged to.
Background technology
In constructing tunnel, general tunnel cross-section, which caunches, to be all made of single branch hole and caunches.But in weak surrounding rock geology and
When large section, pilot tunnel section is small, main tunnel section is big, caunches according to single branch hole, pilot tunnel must first climb to main tunnel keystone
It caunches, and final bottomed to shop fixtures absolute altitude；During bottomed, pilot tunnel bottom is hanging, while its own stress, main tunnel initial stage branch
Parallel pilot tunnel wall bottom will be also transmitted to by protecting the external force born, therefore its stress is complicated, and surrouding rock deformation increases, to pilot tunnel structure and just
Complete preliminary bracing stress is unfavorable in hole, be easy to cause vault cave in, vault sinking, large deformation so that caunch unsuccessfully, and pilot tunnel is disconnected
Face depth-width ratio is big, and stress is unfavorable, and there are serious safety risks.Therefore, caunch applicable general tunnel cross-section and preferably in single branch hole
Matter condition, for Unfavorable geology and large section, single branch hole is caunched there are stress complexity, difficult supporting, yielding, security risk is big
The shortcomings that.
Invention content
It is used in weak surrounding rock geology and large section tunnel tunneling construction it is an object of the invention to be directed to existing
Single branch hole caunch complicated existing stress, difficult supporting, it is yielding, security risk is big the problems such as, a kind of tunnel and Double branch hole is provided and is chosen
Push up construction method.
To achieve the above object, technical solution of the invention is：A kind of tunnel and Double branch hole ripping construction method, including
Following steps：
Step 1, preparation of construction；
Step 2 is staggered on the basis of around in parallel pilot tunnel and carries out the excavation supporting in upper branch hole and lower branch hole, makes branch
Hole climbing is intersected with main tunnel upper vertical, lower branch hole flat slope and main tunnel bottom intersect vertically；
Step 3 erects gate steelframe in lower branch hole and main tunnel intersection, reinforces intersection section supporting；
Step 4, upper branch hole are caunched into main tunnel top, so that its top is higher by main tunnel vault absolute altitude 1m or more, then flat slope
Main tunnel top is excavated, supporting is carried out according to rock property by upper branch hole direction, the upper branch hole that is further continued for constructing is to beyond positive cavity portion
Not less than 1m, plug wall then is performed beyond positive cavity portion to upper branch hole, and plug position is reinforced using C35 concrete backfills and is enclosed
Rock；
Step 5 erects the preliminary bracing steelframe on main tunnel top, and then gunite concrete is closed, then caunches top to upper branch hole
It is partly backfilled between portion and main tunnel top preliminary bracing steelframe；
Step 6, branch hole abutment wall in dismounting set pipe canopy and slip casting along line direction on main tunnel top, then excavate main tunnel
Top, and main tunnel profile steel frame is set up, set anchor pole locking, gunite concrete closing；
Step 7, lower branch hole enter main tunnel lower part, and supporting is carried out according to rock property, and lower branch hole of continuing to construct is to beyond just
Cavity portion is not less than 1m, then performs plug wall, reinforces plug position country rock using C35 concrete backfills, and be embedded in lower branch
The steelframe of main tunnel lower part preliminary bracing within the scope of hole；
Step 8, excavate main tunnel top to lower branch hole run through main tunnel position, make main tunnel top preliminary bracing steelframe one end with
The gate steelframe connection that lower branch hole is set up in main tunnel intersection, the other end and the main tunnel lower part preliminary bracing within the scope of lower branch hole
Steelframe connects, to form circumferential steelframe support；
Step 9 continues to excavate main tunnel top extremely to be more than that two, main tunnel position length of bench is run through in lower branch hole, then under
Branch hole starts bottomed, the sandbag of removing main tunnel lower part backfill through main tunnel position, and tunnel is formed through the position of main tunnel in lower branch hole
Road large span section, firm wall, and excavation and supporting are carried out to the large and small mileage direction in tunnel with this big cross section, it is finally completed big
The construction of section weak surrounding rock.
It further include below step behind the step nine：
Main tunnel top is connected to main tunnel lower part, after in tunnel, large span section is formed, in upper branch hole and main tunnel intersection
Branch hole in closing.
Preparation of construction specifically includes following steps in the step one：
Step 1, the excavation of parallel pilot tunnel and supporting are followed " weak blast, short using step method in construction
Drilling depth " principle is aided with digging machine based on hand excavation；
Step 2, according to design parameter setting profile steel frame, advanced tubule, lock foot anchor tube, radial direction in parallel pilot tunnel
Grouting Pipe, inverted arch concrete are closely followed, and so that inverted arch concrete is no more than 35m away from face distance, inverted arch both sides set gutter.
Compared with prior art, the beneficial effects of the invention are as follows：
1, the method that the present invention is caunched using upper and lower branch hole caunches out to weak surrounding rock large cross-section tunnel using double branch holes
It digs, has decomposed excavated section, be conducive to the deformation for controlling big cross section weak surrounding rock, be more easy to supporting, it is safer.
2, the present invention increases parallel operations working face using the method that branch hole, lower branch hole are caunched in front and back stagger setting,
It accelerates construction progress.
3, upper branch hole, lower branch hole are orthogonal with main tunnel in the present invention, optimize force structure, reduce site operation risk.
4, it is caunched by upper branch hole, lower branch hole in the present invention, provides dash condition, promote ventilation effect, improved
Operating environment.
Description of the drawings
Fig. 1 is that the upper branch hole holes Xia Zhi are caunched a section floor map in the present invention.
Fig. 2 is that upper branch hole is caunched diagrammatic cross-section in the present invention.
Fig. 3 is that lower branch hole is caunched diagrammatic cross-section in the present invention.
Fig. 4 is branch hole and lower branch hole schematic longitudinal section on line direction.
In figure, parallel pilot tunnel 1, upper branch hole 2, lower branch hole 3, main tunnel 4.
Specific implementation mode
Below in conjunction with description of the drawings, the present invention is described in further detail with specific implementation mode.
Referring to Fig. 1 to Fig. 4, a kind of tunnel and Double branch hole ripping construction method is a kind of tunnel weak surrounding rock large cross section excavation
Construction method, the double branch hole ripping construction methods of predominantly a kind of large cross-section tunnel；Include the following steps：
Step 1, preparation of construction.
Step 2 is staggered on the basis of around in parallel pilot tunnel 1 and carries out the excavation supporting in upper branch hole 2 and lower branch hole 3, makes
The climbing of branch hole 2 is intersected with 4 upper vertical of main tunnel, lower 3 flat slope of branch hole and 4 bottom of main tunnel intersect vertically.
Step 3 erects gate steelframe in lower branch hole 3 and 4 intersection of main tunnel, reinforces intersection section supporting.
Step 4, upper branch hole 2 are caunched into 4 top of main tunnel, so that its top is higher by 4 vault absolute altitude 1m of main tunnel or more, then
Flat slope excavates 4 top of main tunnel, carries out supporting according to rock property by upper 2 direction of branch hole, the upper branch hole 2 that is further continued for constructing is to beyond just
4 part of hole is not less than 1m, then performs plug wall beyond 4 part of main tunnel to upper branch hole 2, and reinforce using C35 concrete backfills
Plug position country rock.
Step 5 erects the preliminary bracing steelframe on 4 top of main tunnel, and then gunite concrete is closed, then is caunched to upper branch hole 2
It is partly backfilled between 4 top preliminary bracing steelframe of top and main tunnel.
Step 6,2 abutment wall of branch hole in dismounting set pipe canopy and slip casting along line direction on 4 top of main tunnel, then excavate just
4 top of hole, and 4 profile steel frame of main tunnel is set up, set anchor pole locking, gunite concrete closing.Before upper 2 abutment wall of branch hole herein is
A part in 2 supporting of the face holes Shang Zhi is 1m because its top is higher by main tunnel 4, so top need not remove, only removes both sides
.
Step 7, lower branch hole 3 enter main tunnel 4 lower part, and supporting is carried out according to rock property, and lower branch hole 3 of continuing to construct is to super
Go out 4 part of main tunnel and be not less than 1m, then perform plug wall, plug position country rock is reinforced using C35 concrete backfills, and be embedded in
The steelframe of 4 lower part preliminary bracing of main tunnel in 3 range of lower branch hole.
Step 8 excavates 4 top of main tunnel to lower branch hole 3 and runs through 4 position of main tunnel, makes 4 top preliminary bracing steelframe one of main tunnel
The gate steelframe set up in 4 intersection of main tunnel with lower branch hole 3 is held to connect, the other end and 4 lower part of main tunnel in 3 range of lower branch hole
Preliminary bracing steelframe connects, to form circumferential steelframe support.
Step 9 excavates 4 top of main tunnel to being more than that two, 4 position of main tunnel length of bench is run through in lower branch hole 3, then in lower branch
Hole 3 starts the sandbag bottomed, 4 lower part of removing main tunnel backfills through 4 position of main tunnel, is formed through the position of main tunnel 4 in lower branch hole 3
Tunnel large span section, firm wall, and excavation and supporting are carried out to the large and small mileage direction in tunnel with this big cross section, it is finally completed
The construction of big cross section weak surrounding rock.
Particularly, behind the step nine further include below step：4 top of main tunnel is connected to 4 lower part of main tunnel, in tunnel
After road large span section is formed, upper branch hole 2 is closed in upper branch hole 2 and 4 intersection of main tunnel.
Specifically, preparation of construction specifically includes following steps in the step one：
Step 1, the excavation of parallel pilot tunnel 1 and supporting are followed " weak blast, short using step method in construction
Drilling depth " principle is aided with digging machine based on hand excavation.
Step 2, according to design parameter setting profile steel frame, advanced tubule, lock foot anchor tube, radial direction in parallel pilot tunnel 1
Grouting Pipe, inverted arch concrete are closely followed, and so that inverted arch concrete is no more than 35m away from face distance, inverted arch both sides set gutter.
Referring to Fig. 1 to Fig. 4, the present invention uses the method that upper branch hole 2 and lower branch hole 3 are caunched, big mainly for weak surrounding rock
The excavation of bore tunnel, decomposes excavated surface, and control deformation preferably utilizes country rock self-stability, reduces weak surrounding rock geology
The risk of caving in section large span section tunnel, and working face is increased, it improves work efficiency, accelerate construction progress；Meanwhile relatively
For small pilot tunnel caunches hangar tunnel support system, space is relatively large, reduces dust pollution and noise pollution, and operating environment obtains
To improvement.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
The specific implementation of the present invention is confined to these explanations.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, and above structure all shall be regarded as belonging to
Protection scope of the present invention.
Claims (3)
1. a kind of tunnel and Double branch hole ripping construction method, which is characterized in that include the following steps：
Step 1, preparation of construction；
Step 2, in parallel pilot tunnel（1）On the basis of front and back be staggered carry out branch hole（2）With lower branch hole（3）Excavation supporting, make
Upper branch hole（2）Climbing and main tunnel（4）Upper vertical intersection, lower branch hole（3）Flat slope and main tunnel（4）Bottom intersects vertically；
Step 3, in lower branch hole（3）With main tunnel（4）Intersection erects gate steelframe, reinforces intersection section supporting；
Step 4, upper branch hole（2）It caunches and enters main tunnel（4）Top makes its top be higher by main tunnel（4）Vault absolute altitude 1m or more, so
Flat slope excavates main tunnel afterwards（4）Top, by upper branch hole（2）Direction carries out supporting according to rock property, is further continued for upper branch hole of constructing（2）
To beyond main tunnel（4）Part is not less than 1m, then to upper branch hole（2）Beyond main tunnel（4）Part performs plug wall, and uses C35
Plug position country rock is reinforced in concrete backfill；
Step 5 erects main tunnel（4）The preliminary bracing steelframe on top, then gunite concrete closing, then to upper branch hole（2）It caunches
Top and main tunnel（4）It is partly backfilled between top preliminary bracing steelframe；
Step 6, branch hole in dismounting（2）Abutment wall, in main tunnel（4）Top sets pipe canopy and slip casting along line direction, then excavates just
Hole（4）Top, and set up main tunnel（4）Profile steel frame sets anchor pole locking, gunite concrete closing；
Step 7, lower branch hole（3）Into main tunnel（4）Lower part carries out supporting according to rock property, continues lower branch hole of constructing（3）Extremely
Beyond main tunnel（4）Part is not less than 1m, then performs plug wall, reinforces plug position country rock using C35 concrete backfills, and pre-
It is embedded in lower branch hole（3）Main tunnel in range（4）The steelframe of lower part preliminary bracing；
Step 8 excavates main tunnel（4）Top to lower branch hole（3）Through main tunnel（4）Position makes main tunnel（4）Top preliminary bracing steel
Frame one end and lower branch hole（3）In main tunnel（4）The gate steelframe connection that intersection is set up, the other end and lower branch hole（3）In range
Main tunnel（4）Preliminary bracing steelframe in lower part connects, to form circumferential steelframe support；
Step 9 continues to excavate main tunnel（4）Top is to more than lower branch hole（3）Through main tunnel（4）Two, position length of bench, then
In lower branch hole（3）Through main tunnel（4）Position starts bottomed, removing main tunnel（4）The sandbag of lower part backfill, in lower branch hole（3）Run through
Main tunnel（4）Position form tunnel large span section, firm wall, and with this tunnel large span section to the large and small mileage direction in tunnel
Excavation and supporting are carried out, the construction of big cross section weak surrounding rock is finally completed.
2. a kind of tunnel and Double branch hole according to claim 1 ripping construction method, which is characterized in that after the step nine
Face further includes below step：
By main tunnel（4）Top and main tunnel（4）Lower part is connected to, after in tunnel, large span section is formed, in upper branch hole（2）With main tunnel（4）
The upper branch hole of intersection closing（2）.
3. a kind of tunnel and Double branch hole according to claim 1 ripping construction method, which is characterized in that in the step one
Preparation of construction specifically includes following steps：
Step 1, parallel pilot tunnel（1）Excavation and supporting, using step method, followed in construction " weak blast, it is short into
Ruler " principle is aided with digging machine based on hand excavation；
Step 2, in parallel pilot tunnel（1）According to design parameter setting profile steel frame, advanced tubule, lock foot anchor tube, radial note
Slurry pipe, inverted arch concrete are closely followed, and so that inverted arch concrete is no more than 35m away from face distance, inverted arch both sides set gutter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610741465.1A CN106437749B (en) | 2016-08-26 | 2016-08-26 | A kind of tunnel and Double branch hole ripping construction method |
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| CN201610741465.1A CN106437749B (en) | 2016-08-26 | 2016-08-26 | A kind of tunnel and Double branch hole ripping construction method |
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| CN106437749A CN106437749A (en) | 2017-02-22 |
| CN106437749B true CN106437749B (en) | 2018-08-03 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107023308A (en) * | 2017-05-27 | 2017-08-08 | 中国水利水电第四工程局有限公司 | A kind of hard rock large cross-section tunnel construction supporting structure and construction method |
| CN110685698B (en) * | 2019-10-29 | 2021-04-27 | 中铁（贵州）市政工程有限公司 | Climbing reverse construction method for newly building large-section tunnel in existing cavern side direction |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102996133A (en) * | 2012-07-02 | 2013-03-27 | 中铁二十三局集团第四工程有限公司 | Construction method applicable to intersection between inclined shaft and slant hole of weak surrounding rock tunnel |
| CN204716248U (en) * | 2015-06-17 | 2015-10-21 | 大连市市政设计研究院有限责任公司 | Tunnel Heng Dong enters main hole and to caunch structure |
| CN205189886U (en) * | 2015-12-10 | 2016-04-27 | 中铁二十局集团第二工程有限公司 | Tunnel transverse passage -way changes main cave construction structures |
| CN105781559A (en) * | 2016-04-11 | 2016-07-20 | 中铁六局集团有限公司 | Ripping construction method for slope inclined shaft duct entering main tunnel |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3138950B2 (en) * | 1992-12-17 | 2001-02-26 | 大成建設株式会社 | Roadway construction method on slope |
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2016
- 2016-08-26 CN CN201610741465.1A patent/CN106437749B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102996133A (en) * | 2012-07-02 | 2013-03-27 | 中铁二十三局集团第四工程有限公司 | Construction method applicable to intersection between inclined shaft and slant hole of weak surrounding rock tunnel |
| CN204716248U (en) * | 2015-06-17 | 2015-10-21 | 大连市市政设计研究院有限责任公司 | Tunnel Heng Dong enters main hole and to caunch structure |
| CN205189886U (en) * | 2015-12-10 | 2016-04-27 | 中铁二十局集团第二工程有限公司 | Tunnel transverse passage -way changes main cave construction structures |
| CN105781559A (en) * | 2016-04-11 | 2016-07-20 | 中铁六局集团有限公司 | Ripping construction method for slope inclined shaft duct entering main tunnel |
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Effective date of registration: 20170216 Address after: 430074 Hubei city of Wuhan province East Lake Development Zone Road No. 21 Applicant after: The Fourth Engineering Co., Ltd. of China Railway 11 Civil Applicant after: China Railroad 11 Bureau Group Co., Ltd. Address before: 430074 Hubei city of Wuhan province East Lake Development Zone Road No. 21 Applicant before: The Fourth Engineering Co., Ltd. of China Railway 11 Civil |
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