CN109882182A - A kind of extra small clear distance construction method in tunnel - Google Patents
A kind of extra small clear distance construction method in tunnel Download PDFInfo
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- CN109882182A CN109882182A CN201910019819.5A CN201910019819A CN109882182A CN 109882182 A CN109882182 A CN 109882182A CN 201910019819 A CN201910019819 A CN 201910019819A CN 109882182 A CN109882182 A CN 109882182A
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Abstract
The present invention provides a kind of extra small clear distance construction method in tunnel, the following steps are included: step 1: tunnel large cross section excavation, the country rock of reserved middle drift two sides of getting out of a predicament or an embarrassing situation does not excavate, suspend face tunneling construction, after double track tunnel variable section inverted arch with carrying out middle drift excavation again after proceeding to face 8-12m；Step 2: excavating middle drift, middle drift is excavated using full section method, and after middle drift is excavated at 38m, segmentation pours mid-board C30 concrete, and section length is 4-5 meters；Step 3: excavating tunnel main tunnel in left side after the completion of construction of central division wall, excavate and constructed using three benching tunnelling methods；Step 4: left side main tunnel is excavated and preliminary bracing is completed to carry out right side tunnel main tunnel after 40m, is excavated and is constructed using three benching tunnelling methods, arch sets 42 ductule of φ and carries out leading pre-supporting；The present invention can effectively reduce the disturbance and destruction of interval pillar, guarantee the stability of country rock, moreover, integral construction process is reasonable, substantially increase construction efficiency.
Description
Technical field
The present invention relates to technical field of tunnel construction, specially a kind of extra small clear distance construction method in tunnel.
Background technique
China belongs to more men, mountain country, in recent years with the implementation of national highway net construction and the depth of strategy to develop western regions
Enter, emerges a large amount of Tunnel Engineering.In tunnel when type selecting, such as use separate tunnel, the left and right line clear distance in tunnel require compared with
Greatly, road or bridge and triangle transition region at Tunnel Connection are larger, cause land use amount also larger, due to by expropriation of land condition or
The restriction of topographic features, it is desirable to reduce the clear distance between left and right threaded list road can use small-clear-distance tunnel pattern or multiple-arch tunnel
Pattern.And Multi-arch Tunnel Construction process is various, cost is higher, also more stringent to construction technical requirement, at present mountain tunnel master
To use small-clear-distance tunnel pattern.
Further, since west area height above sea level is higher, route selection is difficult to pass through mountain peak from suitable bealock in many cases.
When building highway, route selection is often directly passed through from the hill-side under mountain peak, and there have been a large amount of bilaterals in this way
Bias small-clear-distance tunnel.Since former China's economic level is low, tunneling technology relatively falls behind, and route selection is generally along mountain valley
Or it is winding build, in Tunnel Design, construction and scientific research, be primarily related to unilateral unsymmetrial loading tunnel.And in recent years occurring
The construction technology of bilateral unsymmetrial loading tunnel is very few, is constructed using existing construction method, and it is big to often result in Characters in Tunnel Surface Settlement, ground
The problems such as large deformation disaster and rock column in-between cracking often occur in face cracking, tunnel, tunnel surrounding and supporting construction stability are difficult
To guarantee.
Summary of the invention
Technical problem solved by the invention is to provide a kind of extra small clear distance construction method in tunnel, to solve above-mentioned background
The problem of being proposed in technology.
Technical problem solved by the invention is realized using following technical scheme: a kind of extra small clear distance construction party in tunnel
Method, comprising the following steps:
Step 1: the country rock of tunnel big cross section tunnel cutting, reserved middle drift two sides of getting out of a predicament or an embarrassing situation does not excavate, and suspends face
Tunneling construction, after double track tunnel variable section inverted arch with carrying out middle drift excavation again after proceeding to face 8-12m；
Step 2: excavating middle drift, middle drift is excavated using full section method, and arch wall sprays C25 concrete 23cm thickness, and arch wall is adopted
With 6.5 steel meshes, spacing 20cm × 20cm, arch wall sets I16 steelframe, and steelframe spacing 1.2m simultaneously sets 2 Φ 22 at steelframe merogenesis
Lock foot anchoring stock, L=3.0m；After middle drift is excavated at 38m, segmentation pours mid-board C30 concrete, and section length is 4-5 meters；
Step 3: excavating left side main tunnel after the completion of construction of central division wall, excavate and constructed using three benching tunnelling methods, it is small that arch sets φ 42
Conduit carries out leading pre-supporting, and it is reliable should to connect stress with the pre-buried steelframe of mid-board and steel plate for arch steelframe on the inside of tunnel, other
Preliminary bracing and two lining parameters are constructed in strict accordance with design drawing；
Step 4: left side main tunnel is excavated and preliminary bracing is completed to carry out right side main tunnel after 40m, is excavated and is used three benching tunnelling methods
Construction, arch set 42 ductule of φ and carry out leading pre-supporting；It is led in being removed while main tunnel intersection in the left and right sides is excavated into hole
Hole preliminary bracing.Strict control is answered to excavate drilling depth in demolishing process.Main tunnel top bar intersection in the left and right sides is excavated into after hole, is left office
Rank is immediately following construction.During main tunnel tunnel cutting, in strict accordance with monitoring measurement require in time embedded measuring point carry out vault sinking and
Horizontal convergence measures, and adjusts process and deformation allowance in time according to measurement, excavates drilling depth etc., accordingly guiding construction, really
Protect construction safety.Inverted arch follows up in time simultaneously, meets safety for tunnel engineering stride requirements.
The middle drift closes face before excavating, closing is using spray C25 Concrete Thick 20cm, steel mesh φ 8, spacing
22 grouting rock bolt of 20cm × 20cm, Φ, long 3.5m, spacing 1m × 1m.
The middle drift sets in its arch range before constructing for the first time and sets 42 ductule of φ progress leading pre-supporting, cementing
Slurry, L=3.5m, circumferential spacing 0.5m.Other locations do not set 42 ductule of φ and carry out leading pre-supporting.
The main tunnel preliminary bracing steel arch-shelf and inverted arch steelframe junction steel plate of the high bottom range of the pre-buried correspondence of mid-board, steel plate
Be it is elongated embedded, protected using foam or wooden unit, concrete placings time-division upper layer and lower layer pour.
Mid-board uses combined steel formwork when the construction of central division wall, designs by no pulling rod formwork, and concrete pours in two times
It builds, the main tunnel preliminary bracing lower part before pouring mid-board lower part concrete for the first time within the scope of pre-buried mid-board respective heights
I16 steel arch-shelf and inverted arch steelframe junction steel plate pour top concrete for the second time and pay attention to steel arch at the top of mid-board respective heights
The protection of frame link position is handled, and concrete is reinforced vibrating, it is ensured that concrete is closely knit, mid-board head room clearance coagulation using pumping in construction
Earthen backfill is to ensure that the key link of construction safety and construction quality.
It should be derusted before the combined steel formwork template installation, polishing processing, it is desirable that template surface is smooth, dimensional discrepancy
Meet design requirement, there is enough rigidity, intensity, stability, and the tight not spillage of seam convenient for disassembly and assembly, and should specify specially
People reinforces checking during concrete pouring, adjustment, to guarantee concret building shape, size and mutual alignment it is correct；Template peace
After installing, check that axis, elevation meet design requirement post-reinforcing, guarantee template it is indeformable after concrete perfusion process stress,
It does not shift.Clean no-sundries in mould, split are smooth tight.The facade of supporting structure, Plane Installation are secured, and when can keep out vibration
Accidentally hit.Bracket upright post is fixed in two mutually perpendicular directions, and vertically and horizontally setting bridging connects perpendicular, lateral steel
Pipe holder, bracket supporting part are placed on solid ground, after template passed examination, brush release agent.
Concrete is using mix, automatic gauge is concentrated when the mid-board is poured, and tank car transports, pumping concrete construction,
Poker vibrator vibrates；Concrete pours in two times, pours mid-board lower part concrete for the first time.It is mixed that top is poured for the second time
Solidifying soil and the protection processing for paying attention to steel arch-shelf link position at the top of mid-board respective heights；Casting before to bracket, template, reinforcing bar and
Built-in fitting is checked, and the dirt on sundries, ponding and the reinforcing bar in template is cleaned out；The gap filling of template is tight
It is close, inner face brushing release agent；The uniformity and the slump of concrete are checked when pouring；Concreting in lifts thickness is no more than
26-30cm, and with immersion vibrator vibration compacting；Pouring for concrete is carried out continuously, when must such as be interrupted for some reason, interruption
The time that time is less than the presetting period of preceding layer concrete or can remold, and it is tests determined, if being more than to allow break time, palpus
It takes and guarantees quality measures or handled by construction joint；During casting concrete, running check template, reinforcing bar and pre-buried component are answered
Position and protective layer size, it is ensured that its position does not deform correctly.And the support situation such as pay attention to template, bracket, if specially
People checks that, if any deformation, displacement or depression are corrected and reinforced immediately；After the completion of concreting, timely and timing sprinkling maintenance.
The left side main tunnel is excavated to be excavated in the form of from center to surrounding expansion, is applied using micro-vibration explosion
Work controls snubber once detonation dose to reduce oscillation intensity, should reinforce Blast Vibration Monitoring in construction, according to monitoring result
Adjustment blasting parameter in time.
Advanced using bracket groove when the micro-vibration blast working, two sides pre -arranged layer blasting method；In middle dike side
Lay preventing polarization belt, i.e. cloth one arranges hole first quick-fried is formationed crushed zone landing between middle dike and the main blast area of bracket groove and bestirs oneself use, this
It detonates at first using lesser dose in column hole；The thickness of middle dike side pre -arranged layer takes 2-5m, on the one hand there is enough thickness
Dike country rock is unlikely to because of dike during country rock exposure duration is too long, Rock Mass Unloading and stress release make after bracket groove explosion in guarantee
Rock mass is impaired, and on the other hand can create preferable free face reduction blasting vibration again influences and guarantee the effect of photoface exploision；It applies
In work, the distance between outside pre -arranged layer and bracket groove explosion are usually no more than 2m, at the same using speed after digging expand etc. measures come
Rock mass deformation is controlled, exposure duration control is within for 24 hours after middle dike side wall rock burst is broken.
Compared with prior art, the beneficial effects of the present invention are: the present invention can effectively reduce interval pillar disturbance and
It destroys, guarantees the stability of country rock, moreover, integral construction process is reasonable, substantially increase construction efficiency.
Detailed description of the invention
Fig. 1 is construction surface structural schematic diagram of the invention.
Specific embodiment
In order to make implement technical means of the invention, creation characteristic, reach purpose and effect is easy to understand, tie below
Conjunction is specifically illustrating, and the present invention is further explained, in the description of the present invention, it should be noted that unless otherwise specific regulation
And restriction, term " installation ", " company ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, be also possible to detachable
Connection, or be integrally connected to be mechanical connection, it is also possible to be electrically connected；It can be directly connected, intermediate matchmaker can also be passed through
Jie is indirectly connected, can connection inside two elements.
As shown in Figure 1, a kind of extra small clear distance construction method in tunnel, comprising the following steps:
Step 1: the country rock of big cross section tunnel cutting, reserved middle drift two sides of getting out of a predicament or an embarrassing situation does not excavate, pause face driving
Construction, after double track tunnel variable section inverted arch with carrying out middle drift excavation again after proceeding to face 8-12m；
Step 2: excavating middle drift, middle drift is excavated using full section method, and arch wall sprays C25 concrete 23cm thickness, and arch wall is adopted
With 6.5 steel meshes, spacing 20cm × 20cm, arch wall sets I16 steelframe, and steelframe spacing 1.2m simultaneously sets 2 Φ 22 at steelframe merogenesis
Lock foot anchoring stock, L=3.0m；After middle drift is excavated at 38m, segmentation pours mid-board C30 concrete, and section length is 4-5 meters；It is described
Middle drift closes face before excavating, closing is using spray C25 Concrete Thick 20cm, steel mesh φ 8, spacing 20cm × 20cm, Φ
22 grouting rock bolts, long 3.5m, spacing 1m × 1m；The middle drift sets in its arch range before constructing for the first time and sets 42 ductule of φ
Carry out leading pre-supporting, cement injection, L=3.5m, circumferential spacing 0.5m.It is advanced pre- that other locations do not set the progress of 42 ductule of φ
Supporting.
Step 3: excavating left side main tunnel after the completion of construction of central division wall, excavate and constructed using three benching tunnelling methods, it is small that arch sets φ 42
Conduit carries out leading pre-supporting, and it is reliable should to connect stress with the pre-buried steelframe of mid-board and steel plate for arch steelframe on the inside of tunnel, other
Preliminary bracing and two lining parameters are constructed in strict accordance with design drawing；The main tunnel initial stage branch of the high bottom range of the pre-buried correspondence of mid-board
Steel arch-shelf and inverted arch steelframe junction steel plate are protected, steel plate is buried to be elongated, protected using foam or wooden unit, on the concrete placings time-division
It pours for two layers down.Mid-board uses combined steel formwork when the construction of central division wall, designs by no pulling rod formwork, concrete is in two times
It pours, the main tunnel preliminary bracing lower part before pouring mid-board lower part concrete for the first time within the scope of pre-buried mid-board respective heights
I16 steel arch-shelf and inverted arch steelframe junction steel plate pour top concrete for the second time and pay attention to steel arch at the top of mid-board respective heights
The protection of frame link position is handled, and concrete is reinforced vibrating, it is ensured that concrete is closely knit, mid-board head room clearance coagulation using pumping in construction
Earthen backfill is to ensure that the key link of construction safety and construction quality.Should be derusted before the combined steel formwork template installation,
Polishing processing, it is desirable that template surface is smooth, and dimensional discrepancy meets design requirement, has enough rigidity, intensity, stability, and
The tight not spillage of seam convenient for disassembly and assembly, and should specify special messenger is reinforced checking during concrete pouring, adjustment, to guarantee that concrete is built
Object shape, size and mutual alignment it is correct；After template installs, checks that axis, elevation meet design requirement post-reinforcing, guarantee
Template is indeformable after concrete perfusion process stress, does not shift.Clean no-sundries in mould, split are smooth tight.Supporting structure
Facade, Plane Installation it is secured, and can keep out vibration when, accidentally hits.Bracket upright post is consolidated in two mutually perpendicular directions
It is fixed, and vertically and horizontally setting bridging connects perpendicular, lateral steel pipe support, bracket supporting part is placed on solid ground, template
After passed examination, brush release agent.Using mix, automatic gauge is concentrated, tank car transport pumps concrete when the mid-board is poured
Concrete construction, poker vibrator vibrate；Concrete pours in two times, pours mid-board lower part concrete for the first time.Second
The secondary protection processing for pouring top concrete and paying attention to steel arch-shelf link position at the top of mid-board respective heights；To branch before casting
Frame, template, reinforcing bar and built-in fitting are checked, and the dirt on sundries, ponding and the reinforcing bar in template is cleaned out；Template
Gap filling it is tight, inner face brushing release agent；The uniformity and the slump of concrete are checked when pouring；Concreting in lifts
Thickness is no more than 26-30cm, and with immersion vibrator vibration compacting；Pouring for concrete is carried out continuously, as some reason must between
When disconnected, the time that break time is less than the presetting period of preceding layer concrete or can remold, and it is tests determined, if being more than to allow
Break time must take and guarantee quality measures or handle by construction joint；During casting concrete, running check template, steel are answered
The size of the position and protective layer of muscle and pre-buried component, it is ensured that its position does not deform correctly.And the branch such as pay attention to template, bracket
Situation is supportted, if special messenger checks, if any deformation, displacement or depression are corrected and reinforced immediately；It is in time and fixed after the completion of concreting
When sprinkling maintenance.
Step 4: left side main tunnel is excavated and preliminary bracing is completed to carry out right side main tunnel after 40m, is excavated and is used three benching tunnelling methods
Construction, arch set 42 ductule of φ and carry out leading pre-supporting；It is led in being removed while main tunnel intersection in the left and right sides is excavated into hole
Hole preliminary bracing.Strict control is answered to excavate drilling depth in demolishing process.Main tunnel top bar intersection in the left and right sides is excavated into after hole, is left office
Rank is immediately following construction.The left side main tunnel is excavated to be excavated in the form of from center to surrounding expansion, is carried out using micro-vibration explosion
Construction controls snubber once detonation dose to reduce oscillation intensity, should reinforce Blast Vibration Monitoring in construction, according to monitoring knot
Fruit adjusts blasting parameter in time.Advanced using bracket groove when the micro-vibration blast working, two sides pre -arranged layer blasting method；
Preventing polarization belt is laid in middle dike side, i.e. cloth one arranges hole first one crushed zone of quick-fried formation landing between middle dike and the main blast area of bracket groove
Bestir oneself use, which detonates at first using lesser dose；The thickness of middle dike side pre -arranged layer takes 2-5m, on the one hand there is foot
Enough thickness guarantee in dike country rock be unlikely to after bracket groove explosion because country rock exposure duration is too long, Rock Mass Unloading and stress release
Keep middle dike rock mass impaired, on the other hand can create preferable free face reduction blasting vibration again influences and guarantee photoface exploision
Effect；In construction, the distance between outside pre -arranged layer and bracket groove explosion are usually no more than 2m, while being expanded using speed after digging
Equal measures control rock mass deformation, and after middle dike side wall rock burst is broken exposure duration control is within for 24 hours.Main tunnel tunnel cutting process
In, require that embedded measuring point carries out vault sinking in time and horizontal convergence is measured in strict accordance with monitoring measurement, according to measurement and
When adjustment process and deformation allowance, excavate drilling depth etc., accordingly guiding construction, it is ensured that construction safety.Inverted arch follows up in time simultaneously,
Meet safety for tunnel engineering stride requirements.
All construction personnel into tunnel building site in work progress, wear security protection articles by regulation, abide by Zhang Shouji,
It submits onself to someone's direction.
Hole side, face upward slope with steep loosen danger stone removed before going into operation completely.
The safe condition of tunnel excavation working environment check at any time, after working face removes float stone and blown-out shot is disposed
Carry out drilling.
Buying, transport, the storage of explosive meet the related regulation of country and place, regulation, and to local public security department
Put on record.
Strict control explosive is established and checks and accepts, enters and (move back) library and management systems, the remaining explosion object on duty such as register, get
The timely cancelling stocks of product.Reinforce the control of explosive in use, prevents loss.
Bursting work in hole, unified command.Carry out explosion when, all personnel withdraw to not by pernicious gas, vibration and fly
The place of stone injury, safe distance should be executed by " railway tunnel construction technical security rule " requirement.
By ventilation smoke exhaust, after personnel's confirmation is without blown-out shot or other insecurity factors on inspection, other constructors after explosion
Member enters working face and carries out next procedure operation.
If it was found that pressing predetermined processing by former explosion personnel when blown-out shot.Do not continue jewel hole in dead hole；Not illumination it is insufficient,
Charge explosion in the case where working face catalase not yet immediate support；Forbid to have kindling material, open fuse blasting when powder charge；Forbid to wear
Chemical fibre clothes carry out explosive processing and bursting work.
Timely and effectively method for protecting support is taken according to country rock situation, the working condition of supporting is checked at any time, if
There are Support Deformation or damage.
Power supply for construction uses three-phase five-wire mode.Inspection, maintenance, maintenance and the erection of power circuit of electrical equipment are by taking an examination
Qualified full-time electrician is responsible for, and electromechanical equipment sets protective device by " one lock of a machine, one earth leakage protective ".
Advance geologic prediction work is carried out, the generation of the things such as the prominent mud of landslide, water burst is prevented.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.Claimed range of the invention by appended claims and
Its equivalent thereof.
Claims (9)
1. a kind of extra small clear distance construction method in tunnel, it is characterised in that: the following steps are included:
Step 1: the country rock of tunnel large cross section excavation, reserved middle drift two sides of getting out of a predicament or an embarrassing situation does not excavate, and suspends face tunneling construction,
After double track tunnel variable section inverted arch with carrying out middle drift excavation again after proceeding to face 8-12m；
Step 2: excavating middle drift, middle drift is excavated using full section method, and arch wall sprays C25 concrete 23cm thickness, and arch wall uses 6.5
Steel mesh, spacing 20cm × 20cm, arch wall set I16 steelframe, and steelframe spacing 1.2m simultaneously sets 2 lock foot anchors of Φ 22 at steelframe merogenesis
Bar, L=3.0m；After middle drift is excavated at 38m, segmentation pours mid-board C30 concrete, and section length is 4-5 meters；
Step 3: excavating left side main tunnel after the completion of construction of central division wall, excavate and constructed using three benching tunnelling methods, arch sets 42 ductule of φ
Leading pre-supporting is carried out, arch steelframe should connect stress reliable, other initial stages with the pre-buried steelframe of mid-board and steel plate on the inside of tunnel
Supporting and two lining parameters are constructed in strict accordance with design drawing；
Step 4: left side main tunnel is excavated and preliminary bracing is completed to carry out right side main tunnel after 40m, is excavated and is constructed using three benching tunnelling methods,
Arch sets 42 ductule of φ and carries out leading pre-supporting；Middle drift initial stage is removed while main tunnel intersection is excavated into hole in the left and right sides
Supporting.
2. the extra small clear distance construction method in a kind of tunnel according to claim 1, it is characterised in that: before the middle drift excavates
Face is closed, using spray C25 Concrete Thick 20cm, steel mesh φ 8,22 grouting rock bolt of spacing 20cm × 20cm, Φ is long for closing
3.5m, spacing 1m × 1m.
3. the extra small clear distance construction method in a kind of tunnel according to claim 1, it is characterised in that: the middle drift is applied for the first time
In its arch, range sets and sets 42 ductule of φ progress leading pre-supporting before work, cement injection, L=3.5m, circumferential spacing 0.5m,
Other locations do not set 42 ductule of φ and carry out leading pre-supporting.
4. the extra small clear distance construction method in a kind of tunnel according to claim 1, it is characterised in that: the mid-board is pre-buried right
The main tunnel preliminary bracing steel arch-shelf and inverted arch steelframe junction steel plate of high bottom range are answered, steel plate is elongated embedded, using foam or wood
Block is protected, and concrete placings time-division upper layer and lower layer pour.
5. the extra small clear distance construction method in a kind of tunnel according to claim 1, it is characterised in that: when the construction of central division wall
Mid-board uses combined steel formwork, designs by no pulling rod formwork, and concrete pours in two times, is pouring mid-board lower part for the first time
Main tunnel preliminary bracing lower part I16 steel arch-shelf and inverted arch steelframe before concrete within the scope of pre-buried mid-board respective heights connect steel
Plate pours top concrete for the second time and pays attention to the protection processing of steel arch-shelf link position at the top of mid-board respective heights, and concrete is adopted
With pumping, reinforce vibrating in construction, it is ensured that concrete is closely knit, and mid-board head room clearance concrete backfill is to ensure that construction safety and construction
The key link of quality.
6. the extra small clear distance construction method in a kind of tunnel according to claim 5, it is characterised in that: the combined steel template die
It should be derusted before plate installation, polishing processing, it is desirable that template surface is smooth, and dimensional discrepancy meets design requirement, has enough
Rigidity, intensity, stability, and the tight not spillage of seam convenient for disassembly and assembly, and special messenger should be specified, reinforce inspection during concrete pouring
Look into, adjust, to guarantee concret building shape, size and mutual alignment it is correct；After template installs, axis, elevation symbol are checked
Design requirement post-reinforcing is closed, guarantees that template is indeformable after concrete perfusion process stress, shift, clean no-sundries in mould,
Split is smooth tight, and the facade of supporting structure, Plane Installation are secured, and can keep out vibration when accidentally hits, and bracket upright post is two
A mutually perpendicular direction is fixed, and vertically and horizontally setting bridging connects perpendicular, lateral steel pipe support, bracket supporting part peace
It sets on solid ground, after template passed examination, brush release agent.
7. the extra small clear distance construction method in a kind of tunnel according to claim 5, it is characterised in that: when the mid-board is poured
Concrete is using mix, automatic gauge is concentrated, and tank car transports, and pumping concrete construction, poker vibrator vibrates；Concrete point
It is secondary to pour, mid-board lower part concrete is poured for the first time, is poured top concrete for the second time and is paid attention to mid-board respective heights
The protection of top steel arch-shelf link position is handled；Bracket, template, reinforcing bar and built-in fitting are checked before casting, and by template
Dirt on interior sundries, ponding and reinforcing bar is cleaned out；The gap filling of template is tight, inner face brushing release agent；When pouring
Check the uniformity and the slump of concrete；Concreting in lifts thickness is no more than 26-30cm, and is shaken with immersion vibrator
Puddling is real；Pouring for concrete is carried out continuously, when must such as be interrupted for some reason, when break time is less than the initial set of preceding layer concrete
Between or the time that can remold, and it is tests determined, if being more than to allow break time, must take and guarantee quality measures or by construction joint
Processing；During casting concrete, the size of running check template, the position of reinforcing bar and pre-buried component and protective layer is answered, it is ensured that
Its position does not deform correctly, and the support situation such as pay attention to template, bracket, if special messenger checks, if any deformation, and displacement or depression
It corrects and reinforces immediately；After the completion of concreting, timely and timing sprinkling maintenance.
8. the extra small clear distance construction method in a kind of tunnel according to claim 1, it is characterised in that: the left side main tunnel is excavated
It is excavated in the form of from center to surrounding expansion, is constructed using micro-vibration explosion, control snubber once detonation dose
It reduces oscillation intensity, Blast Vibration Monitoring should be reinforced in construction, adjust blasting parameter in time according to monitoring result.
9. the extra small clear distance construction method in a kind of tunnel according to claim 8, it is characterised in that: the micro-vibration explosion is applied
Working hour advanced, two sides pre -arranged layer blasting method using bracket groove；Preventing polarization belt is laid in middle dike side, i.e. it is first quick-fried to arrange hole for cloth one
It forms crushed zone landing between middle dike and the main blast area of bracket groove to bestir oneself use, which rises at first using lesser dose
It is quick-fried；The thickness of middle dike side pre -arranged layer takes 2-5m, on the one hand have enough thickness guarantee in dike country rock in bracket groove explosion
After be unlikely on the other hand to create again because country rock exposure duration is too long, Rock Mass Unloading and stress release keep middle dike rock mass impaired
Making preferable free face reduction blasting vibration influences and guarantees the effect of photoface exploision；In construction, outside pre -arranged layer is in
The distance between slot explosion, while rock mass deformation, exposure after middle dike side wall rock burst is broken are controlled using the measures such as speed expansion after digging
Time controls within for 24 hours.
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| CN111335914A (en) * | 2020-04-09 | 2020-06-26 | 中铁二院工程集团有限责任公司 | Rock pillar replacement system in weak surrounding rock small-clear-distance tunnel and construction method |
| CN111485904A (en) * | 2020-04-24 | 2020-08-04 | 中国五冶集团有限公司 | Construction method for large-section multi-arch tunnel mid-partition wall |
| CN113503784A (en) * | 2021-07-28 | 2021-10-15 | 中国水利水电第七工程局有限公司 | Compaction device for blast hole blocking structure and application method thereof |
| CN113898371A (en) * | 2021-09-10 | 2022-01-07 | 贵州省公路工程集团有限公司 | Tunnel anchor and bifurcation tunnel proximity engineering synchronous construction method distributed up and down in space |
| CN114352291A (en) * | 2022-01-07 | 2022-04-15 | 贵州路桥集团有限公司 | Construction method of proximity tunnel |
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| CN110219654A (en) * | 2019-07-12 | 2019-09-10 | 中铁隧道集团一处有限公司 | The leading construction method of mud stone multiple-arch tunnel side pilot tunnel |
| CN110219654B (en) * | 2019-07-12 | 2020-06-09 | 中铁隧道集团一处有限公司 | Advanced construction method for side pilot tunnel of mud-rock arch tunnel |
| CN111335914A (en) * | 2020-04-09 | 2020-06-26 | 中铁二院工程集团有限责任公司 | Rock pillar replacement system in weak surrounding rock small-clear-distance tunnel and construction method |
| CN111485904A (en) * | 2020-04-24 | 2020-08-04 | 中国五冶集团有限公司 | Construction method for large-section multi-arch tunnel mid-partition wall |
| CN113503784A (en) * | 2021-07-28 | 2021-10-15 | 中国水利水电第七工程局有限公司 | Compaction device for blast hole blocking structure and application method thereof |
| CN113503784B (en) * | 2021-07-28 | 2023-03-14 | 中国水利水电第七工程局有限公司 | Compaction device for blast hole blocking structure and application method thereof |
| CN113898371A (en) * | 2021-09-10 | 2022-01-07 | 贵州省公路工程集团有限公司 | Tunnel anchor and bifurcation tunnel proximity engineering synchronous construction method distributed up and down in space |
| CN113898371B (en) * | 2021-09-10 | 2024-02-23 | 贵州省公路工程集团有限公司 | Synchronous construction method for tunnel anchors and bifurcation tunnel proximity engineering distributed up and down in space |
| CN114352291A (en) * | 2022-01-07 | 2022-04-15 | 贵州路桥集团有限公司 | Construction method of proximity tunnel |
| CN114352291B (en) * | 2022-01-07 | 2024-05-07 | 贵州路桥集团有限公司 | Construction method of near tunnel |
| CN116658178A (en) * | 2023-07-31 | 2023-08-29 | 中铁十七局集团第五工程有限公司 | Ultra-small clear distance tunnel subsection differential blasting vibration reduction and isolation construction method |
| CN116658178B (en) * | 2023-07-31 | 2023-10-13 | 中铁十七局集团第五工程有限公司 | Ultra-small clear distance tunnel subsection differential blasting vibration reduction and isolation construction method |
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