CN106988750A - The embodiment at existing station is worn under a kind of large span running tunnel super close distance - Google Patents
The embodiment at existing station is worn under a kind of large span running tunnel super close distance Download PDFInfo
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- CN106988750A CN106988750A CN201710383357.6A CN201710383357A CN106988750A CN 106988750 A CN106988750 A CN 106988750A CN 201710383357 A CN201710383357 A CN 201710383357A CN 106988750 A CN106988750 A CN 106988750A
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- small pilot
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D9/003—Arrangement of measuring or indicating devices for use during driving of tunnels, e.g. for guiding machines
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- 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
Abstract
The present invention relates to the embodiment that existing station is worn under a kind of large span running tunnel super close distance, it is included in both wired arrangement measuring points, excavating shaft, the small pilot tunnel of avris of constructing, multiple steps such as Under-cross tunnel main track construction.Instant invention overcomes existing big across the deficiency that building up station is worn under running tunnel, there is provided a kind of new construction technology, both wired sedimentation can effectively be controlled using this method, the safety coefficient of construction is worn under raising, the safety of operation is worn under ensuring, accelerating construction progress reduces the use of engineering material, reduce the technical barrier that building up station is worn under construction costs, the large span section tunnel that solution faces at present.In addition, can be with the mechanical property between enhancing structure by construction method provided by the present invention, concrete is with pressure pours for especially two linings, it is ensured that the compactness of arch crown part, greatly enhances the durability of structure.
Description
Technical field
The present invention relates to constructing metro tunnel technical field, worn both under especially a kind of large span running tunnel super close distance
There is the embodiment at station.
Background technology
With the utilization of the underground space, subway turns into a kind of irreplaceable trip mode, while with subway line
Increase, it may appear that worn under newly-built circuit, side is worn, on wear building up station.Existing subway line, particularly bored tunnel are wherein worn down
Under wear building up station technical difficulty and risk highest.It is former with the disturbance and deformation of soil layer in the work progress of newly-built circuit
Some stress systems are destroyed, and can be deformed, after deformation reaches to a certain degree, can be produced destructive on existing line
Influence, will influence the normal operation of existing line.And the generation process of accident is irreversible, later stage repairing difficulty is big, applies
The social influence that work is produced is severe.
Newly-built circuit particularly large span running tunnel, under wear building up station traditional design method usually flat top wall,
The span of flat top wall technological requirement list pilot tunnel is not more than 4 meters, and many for the interval flat top wall technique chamber of big degree of collapsing, two linings are applied
As when tear that support is complicated open and structure stress conversion exists to wear engineering under problem, general this type and often turn into and limits whole engineering and enter
The key node of exhibition, is particularly important so how to improve down and wear the safety coefficient and construction speed of operation.
The content of the invention
It is an object of the invention to make up the deficiencies in the prior art part, there is provided a kind of large span running tunnel super close distance
Under wear the embodiment at existing station.
The purpose of the present invention is realized by following technological means：
The embodiment at existing station is worn under a kind of large span running tunnel super close distance, it is characterised in that：Including following step
Suddenly：
(1) is in both wired arrangement measuring points, when wearing operation under monitoring, both wired sedimentations, and sets up monitor value analysis and oneself
Early warning system is moved, wear operation under is monitored in real time；
(2) Full-face pouring is carried out before excavating shafts, the small pilot tunnel of avris of constructing, small pilot drive, soil around pilot tunnel is reinforced
Body, bearing is provided for the jacking of jack；Small pilot drive uses Mining Method, and support form is grid+in-network processing, strictly
The tunneling " ten Eight Terms Guidelines " of " pipe is advanced, tight slip casting, short excavation, strong supporting, and fast closing, duty is measured " is followed, Ring Cutting is pre-
Stay Core Soil；PVC sleeve pipes are worn to grid reinforcing bar in hydraulic jack position, reinforcing bar is protected, can be reduced when the later stage cuts top
The amount of labour abolished；
(3) applies strip footing in small pilot tunnel, when strip footing is constructed, in hydraulic jack correspondence position pre-buried steel
Plate, and make jack base stopper slot；
(4) is released the position of jack by survey crew, and Zhi Jinhang at the beginning of small pilot tunnel is abolished, and is preferably selected water drilling to cut, is subtracted
Less to both wired disturbance, it pneumatic pick can be used to be abolished when appropriate, abolish hole diameter preferably than hydraulic jack nominal
Big 15cm of diameter or so；
(5) the artificial diggings of, install jack, and jack end is arranged in the stopper slot of strip footing, and other end is led to
Cross flexible liner to withstand on both bottom plates of cable architecture, it is ensured that the perpendicularity of jack when installing jack, to orifice position
Closed processes are carried out, jack sets hydraulic jack protective case before hole installation is entered on the outside of it, and protective case requires seal
Can be good, and be elastomeric material, in jack end and jack colligation, do shell nosing treatment, it is ensured that during backfill slip casting, jack
Top lift can be normally provided；
Meanwhile, concrete backfill pipe is set in protective case outer layer, three slurry mouths that overflow are set on concrete backfill pipe, to protect
Card filling it is closely knit, improve structure stress performance, three overflow slurry mouths set Opening pressures, be followed successively by from the bottom up 0.2M,
0.5Mpa、1.0Mpa；Three concretes are set to backfill pipe around each jack, it is ensured that backfill is up backfilled successively from bottom, it is ensured that
The compactness of backfill；
Jack from can automatic regulation type hydraulic jack, in the small pilot tunnel construction stage, hydraulic jack is carried
For initial top lift, the size of initial top lift should be can control pilot drive and both wired be settled into standard；Jack jacking
After completion, to small pilot tunnel vault slotting position, arrangement backfill filling system is reinforced because excavating the crack produced, and carry out hole
The seal operation of mouth；
(7) after treats that the small pilot drive completion in both sides and jack jacking are completed, the construction of Under-cross tunnel main track, mirror are carried out
The risk worn under, the present invention increases the method for fulcrum to improve down the safety coefficient worn using " cross-cut ", and due to list
The construction technology engineering method in hole is simple, and supporting difficulty is smaller, so for wearing construction under, can improve the progress of construction；
(8) main tracks, which are excavated, uses u-shaped cross-section, carries out Full-face pouring before excavating, it is ensured that the globality of tunnel structure is firm
Degree, reduces the risk factor during later stage operation, should especially carry out tunnel advanced deep hole grouting, it is ensured that safe excavation, upper leave from office
Rank method, Ring Cutting remaining core soil in advance, set lock pin anchor tube, and carry out slip casting to lock pin anchor tube, and should carry out the advanced of tunnel
Supporting measure；
Main tracks Tunnel construct when, should supporting in the early stage behind, reserve behind backfill Grouting Pipe, filling both
Space between wired structure with newly built tunnels, it is ensured that two structures carry out rigid contact；
(10) after the completion of preliminary bracings, tunnel double-lining construction is carried out, operation completion is so far worn down.
Moreover, (1) described point layout is in the range of Under-cross tunnel one times of span of construction for step, i.e., with Under-cross tunnel
Extend centered on heart line to both sides.
Moreover, step (2) in described Mining Method, sets lock foot anchoring stock, lock pin anchor tube is using steel weldering at grid arch springing
Pipe, lock pin anchor tube carries out grouting and reinforcing arch springing in time with drilling depth, prevents the globality of small pilot tunnel from sinking；Lock pin anchor tube slip casting is used
Single liquid cement mortar, grouting pressure is controlled in 0.5~1.0Mpa.
Moreover, step is (8) described to set lock pin anchor tube, and its specific steps of slip casting and small pilot tunnel are carried out to lock pin anchor tube
It is identical in Mining Method.
Moreover, wearing operation under whole, monitoring is digitized to the top lift of jack, and can be according to both wired structure
Differential settlement carry out otherness regulation jacking, it is ensured that both cable architecture be deposited in it is controllable within the scope of.
Moreover, in work progress, having used a set of hydraulic pressure support structure, the hydraulic pressure support structure includes jack, protected
Sheath, elongated steel plate, deep floor and flexible liner, described jack is multiple, and it sets along small pilot tunnel longitudinal axis direction
Put, each jack from can automatic regulation type hydraulic jack, the base of each jack is installed in small pilot tunnel bar
In the stopper slot on shape basis, and base and the pre-embedded steel slab fixation of jack, set on jack base elongated steel plate and
Deep floor；Protective case is respectively provided with the outside of each jack, the telescopic end of jack is encapsulated in inside protective case, and protective case
Shell nosing treatment is done in jack end and jack colligation；The upper end of each jack and protective case is withstood on by flexible liner
Both on the bottom plate of cable architecture.
Moreover, the protective case outer layer in each jack is respectively provided with three concrete backfill pipes, on concrete backfill pipe
Three slurry mouths that overflow are set, and the Opening pressure of three slurry mouths that overflow increases, sets and stop in concrete backfill bottom of the tube successively from the bottom up
Slurry plug and backing plate.
Moreover, a pressure sensor is arranged in each hydraulic jack, pressure sensor connection control valve group,
Synchronous hydraulic pumping plant is simultaneously connected through signal wire with PLC Multi-thread control devices.
Advantages and positive effects of the present invention are：
1st, the present invention is applied to wear the way of building up station under multiple track tunnel, relative to " under Rectangular Tunnel section zero distance
Wear the supporting construction and construction method of building up station ", horse-shoe tunnel structure is more preferable compared with Rectangular Tunnel stress performance, and the present invention
Using building up station is worn under a plurality of one-tunnel one-track tunnel, mutually stagger a certain distance between each tunnel line, it is ensured that existing
The deflection of circuit, reduces and excavates the risk that large cross-section tunnel is excavated, compared with traditional flat top wall method, reduce and tear open
Support and the difficulty of two lining waterproof constructions, accelerate construction speed.
2nd, the tunnel that uses of the present invention, which pours chassis and is provided with, pours pressure sensor and three pour mouth, speed of perfusion compared with
Traditional method lifting left and right, and avoid the situation that Normal practice pours the existing cavity of rear arch ejection by about one time, improves two linings and mixes
The durability and stress performance of Xtah Crude Clay structure.
3rd, the present invention reinforces the measure of draining using Full-face pouring, reduces newly built tunnels sedimentation, adds tunnel
The length of service.
4th, the backfill Grouting Pipe that the present invention is used, there is provided the pack densification between three-level Opening pressure, two structures
It can be guaranteed, it is ensured that really be able to accomplish to be rigidly connected.
5th, the present invention uses hydraulic jack flexible protective casing, reusable after the completion of agent structure is applied.
6th, the present invention is the embodiment that existing station is worn under a kind of large span running tunnel super close distance, first, by this
Method can effectively control to wear the safety coefficient of construction under both wired sedimentation, raising, it is ensured that under wear the safety of operation, simultaneously
The use of engineering material with accelerating construction progress, can be reduced, is reduced under construction costs, the large span section tunnel that solution faces at present
Wear the technical barrier of building up station.Secondly, can be with the mechanical property between enhancing structure by construction method provided by the present invention
Can, concrete is with pressure pours for especially two linings, it is ensured that the compactness of arch crown part, greatly enhances the durability of structure.
Brief description of the drawings
Fig. 1 is the rough package drawing of the present invention；
Fig. 2 is that small pilot drive reinforces schematic diagram；
Fig. 3 is hydraulic jack jacking control system figure；
Fig. 4 wears interval under being just branch excavates advance reinforcement schematic diagram；
Fig. 5 wears the lining band pressure of running tunnel two and pours schematic diagram under being；
Fig. 6 is concrete backfill pipe schematic diagram at jack.
Embodiment
Describe embodiments of the invention in detail below in conjunction with the accompanying drawings；It should be noted that the present embodiment is narrative, no
It is limited, it is impossible to which protection scope of the present invention is limited with this.
The embodiment at existing station is worn under a kind of large span running tunnel super close distance, is comprised the following steps：
(1) is in both wired arrangement measuring points, when wearing operation under monitoring, both wired sedimentations, and sets up monitor value analysis and oneself
Early warning system is moved, wear operation under is monitored in real time.
Point layout is prolonged in the range of Under-cross tunnel one times of span of construction centered on Under-cross tunnel center line to both sides
Stretch.
(2) excavating shafts, the small pilot tunnel 1 of avris of constructing, small pilot tunnel 1 carries out Full-face pouring before excavating, and reinforces around pilot tunnel
The soil body, the jacking for jack 8 provides bearing；Small pilot drive uses Mining Method, and support form is grid+in-network processing,
The tunneling " ten Eight Terms Guidelines " of " pipe is advanced, tight slip casting, short excavation, strong supporting, and fast closing, duty is measured " is followed strictly, annular is opened
Dig remaining core soil in advance；PVC sleeve pipes are worn to grid reinforcing bar in hydraulic jack position, reinforcing bar is protected, the later stage can when cutting top
Reduce the amount of labour abolished.
In Mining Method, set lock pin anchor tube at grid arch springing, lock pin anchor tube uses steel welded tube, lock pin anchor tube with drilling depth and
Shi Jinhang grouting and reinforcing arch springings, prevent the globality of small pilot tunnel from sinking；Lock the slip casting of pin anchor tube and use single liquid cement mortar, grouting pressure
Control is in 0.5~1.0Mpa.
(3) applies strip footing 2 in small pilot tunnel, when strip footing 2 is constructed, in hydraulic jack correspondence position pre-buried steel
Plate, and make jack base stopper slot.
(4) is released the position of jack by survey crew, and to small pilot tunnel 1, just Zhi Jinhang is abolished, and is preferably selected water drilling to cut, is subtracted
Less to both wired disturbance, it pneumatic pick can be used to be abolished when appropriate, abolish hole diameter preferably than hydraulic jack nominal
Big 15cm of diameter or so.
(5) the artificial diggings of, install jack 8, and the end of jack 8 is arranged in the stopper slot 3 of strip footing, other end
Withstood on by flexible liner 5 on the bottom plate 4 of both cable architectures, it is ensured that the perpendicularity of jack when installing jack 8, to aperture
Position carries out closed processes, and jack 8 sets hydraulic jack protective case 7, protective case requirement before hole installation is entered on the outside of it
Airtight performance is good, and is elastomeric material, in jack end and jack colligation, does shell nosing treatment, it is ensured that during backfill slip casting,
Jack 8 can normally provide top lift；
Meanwhile, concrete backfill pipe is set in protective case outer layer, three slurry mouths 27,28 that overflow are set on concrete backfill pipe
With 29, to ensure that filling is closely knit, the stress performance of structure is improved, three slurry mouths that overflow set Opening pressures, are followed successively by from the bottom up
0.2M、0.5Mpa、1.0Mpa；In concrete backfill bottom of the tube, stop grouting plug 30 and backing plate 31 are set.Set around each jack
Three concrete backfill pipes, it is ensured that backfill is up backfilled successively from bottom, it is ensured that the compactness of backfill.
Jack 8 from can automatic regulation type hydraulic jack, in the small pilot tunnel construction stage, to hydraulic jack 8
There is provided initial top lift, the size of initial top lift should be can control pilot drive and both wired be settled into standard；Jack 8 is pushed up
Rise after completing, to small pilot tunnel vault slotting position, arrangement backfill filling system 6 is reinforced because excavating the crack produced, and carry out
The seal operation in aperture.
(7) after treats that the small excavation of pilot tunnel 1 completion in both sides and the jacking of jack 8 are completed, the construction of Under-cross tunnel main track is carried out,
In view of under the risk worn, the present invention improves down the safety coefficient worn using the method for " cross-cut " increase fulcrum, and due to
The construction technology engineering method in single hole is simple, and supporting difficulty is smaller, so for wearing construction under, can improve entering for construction
Degree.
(8) main tracks, which are excavated, uses u-shaped cross-section, carries out Full-face pouring before excavating, it is ensured that the globality of tunnel structure is firm
Degree, reduces the risk factor during later stage operation, should especially carry out tunnel advanced deep hole grouting, it is ensured that safe excavation, upper leave from office
Rank method, Ring Cutting remaining core soil in advance, set lock pin anchor tube, and slip casting (its specific steps and small pilot tunnel are carried out to lock pin anchor tube
It is identical in Mining Method), and the advance support measure in tunnel should be carried out；
Main tracks Tunnel construct when, should supporting in the early stage behind, reserve behind backfill Grouting Pipe, filling both
Space between wired structure with newly built tunnels, it is ensured that two structures carry out rigid contact.
(10) after the completion of preliminary bracings, tunnel double-lining construction is carried out, operation completion is so far worn down.
Operation is worn under whole, monitoring is digitized to the top lift of jack, and can be uneven according to both wired structure
It is even sedimentation carry out otherness regulation jacking, it is ensured that both cable architecture be deposited in it is controllable within the scope of.
A set of hydraulic pressure support structure is used in this construction method, its concrete structure is as follows：Including jack, protective case,
Elongated steel plate, deep floor and flexible liner, described jack is multiple, and it is set along small pilot tunnel longitudinal axis direction, often
Individual jack from can automatic regulation type hydraulic jack.
The base of each jack is installed in the stopper slot of small pilot tunnel strip footing, and the base of jack with it is pre-buried
Interal fixation firmly, sets elongated steel plate and deep floor on jack base.Protective case is respectively provided with the outside of each jack,
Protective case requires that airtight performance is good, and is elastomeric material.The telescopic end of jack is encapsulated in inside protective case.Protective case is thousand
Jin top ends do shell nosing treatment with jack colligation.The upper end of each jack and protective case is withstood on existing by flexible liner
On the bottom plate of cable architecture.
Three concrete backfill pipes are respectively provided with the protective case outer layer of each jack, three are set on concrete backfill pipe
Individual excessive slurry mouth, three overflow slurry mouths Opening pressures increase successively from the bottom up, concrete backfill bottom of the tube set stop grouting plug and
Backing plate.A pressure sensor, pressure sensor connection control valve group, synchronous hydraulic are arranged in each hydraulic jack
Pumping plant is simultaneously connected through signal wire with PLC Multi-thread control devices.
A specific embodiment is chosen below above-mentioned embodiment is described in detail：
This example have chosen the threaded list road of Beijing's Subway Tunnel four it is closely connected under wear both wired stations (original be designed as two and gone out
Enter section line and the two interval main track tunnels built using flat top wall technique), after optimization design, using hydraulic jack
Synchronization of jacking up technology is supported to both wired stations, while reducing tunnel excavation span, two are changed into from original flat top wall
Bar single-track tunnel, meets the normal operation demand of circuit.
The construction method that existing station is worn under the large span running tunnel super close distance is concretely comprised the following steps：
Step one, the both wired station track worn under in interval coverage sets up measuring point 13, and point layout is worn under
In the range of one times of constructing tunnel span, i.e., respectively extend 60m to both sides centered on Under-cross tunnel center line.
Step 2, in the distance both general 30m positions construction shaft in wired station, excavates transverse passage-way, and then enter two sides
The construction of the small pilot tunnel 1 in side, it is that width is 3.6m that the small pilot tunnel 1 of two avris, which excavates outer profile size, is highly 4.6m, before excavation,
To carrying out Full-face pouring in small pilot tunnel 1, grouting and reinforcing soil body scope is abutment wall 3m, and vault is 3.2m, and inverted arch bottom soil body is
2.5m, injecting paste material uses modified water glass in anhydrous fine sand layer, and remaining stratum is using single liquid cement mortar, grouting pressure
For 0.5~1Mpa.
Step 3, often circulates after slip casting completion, small pilot tunnel is excavated, excavation uses Mining Method, and grid spacing is
0.5m, point up/down steps (ultrashort benching tunnelling method：Length of bench is 3~5m), remaining core soil in advance sets lock pin anchor at grid arch springing
Pipe 32, lock pin anchor tube is the steel welded tubes of φ 42, and lock pin anchor tube carries out grouting and reinforcing arch springing with drilling depth, prevents the entirety of small pilot tunnel in time
Property sink.The slip casting of pin anchor tube is locked using single liquid cement mortar, and grouting pressure is controlled in 0.5~1.0Mpa.Preliminary bracing should be sealed early
Cyclization is closed, PVC sleeve pipes are worn on the grid reinforcing bar of small pilot tunnel keystone correspondence hydraulic jack position, to avoid the later stage from cutting top
When increase the workload abolished due to the bond stress of concrete and rebar.
Step 4, small pilot tunnel 1 is excavated to after specified location, strip footing 2 is applied, right before strip footing concreting
The pre-buried 10mm steel plates 12 in jack position are answered, steel plate sets dowel behind, and dowel length meets 36d, and dowel is carried on the back with steel plate
Face two-sided welding is firm.
Step 5, setting-out is carried out to small pilot tunnel keystone, and the center spacing of jack 8 is 1.5m, in 8, jack of correspondence
Progress vault is put to abolish, it is preferential to be cut using water drilling, the disturbance to the interlayer soil body is reduced, proper time can also be used pneumatic pick to carry out
Abolish, abolishing aperture should 15cm bigger than jack diameter or so；Artificial borehole cleaning is until hole depth reaches both cable architecture bottom plates 4.Peace
Fill elongated steel plate 10 and deep floor 11 are set on jack base, base and pre-embedded steel slab fixation, base fixing and
The side force that balanced hydraulic jack is produced.Install protective case 7 additional to jack, the telescopic end of hydraulic jack is encapsulated in protection
Set is internal, prevents the soil body and concrete slurry from hydraulic jack is caused to corrode and destroyed, and improves the service life of jack.
The front end of protective case is the position contacted with structure base slab, using flexible liner 5, prevents hydraulic jack from producing stress concentration pair
Both cable architecture bottom plate was damaged；Punched place in small pilot tunnel vault, three concrete backfill pipes reserved with the installation of jack,
In case after jack installation, carrying out the cavity that backfill pouring construction is produced, and add the rigidity of two bearings, phase
That answers can reduce the pressure worn under running tunnel, to reducing both cable architecture sinkings or having positive role.
Step 6, setting load is provided to hydraulic jack 8, and pressure sensor 9, the pressure are arranged in hydraulic jack 8
Sensor connection control valve group 14, synchronous hydraulic pumping plant 15 are simultaneously connected through signal wire 16 with PLC Multi-thread controls device 17.Construction is just
Phase, the numerical value of setting load is unsuitable excessive, effectively support should be formed to existing structure bottom plate for principle to meet, kept a close eye on simultaneously
Building up station settlement observation value.In small pilot tunnel after jack installation, and after grouting backfill completion, carrying out interval just
The excavation in threaded list road.
Step 7, this interval is four threaded list roads, and both sides are respectively east, exported to the west into a section line, and centre is interval main track tunnel, tunnel
Before road construction, grouting and reinforcing is carried out to the soil body in tunnel excavation coverage, the advanced depth in front of excavation face should be especially carried out
Hole slip casting, vault uses advanced tubule 21, using the steel welded tube of diameter 42, and length is 5 meters, set angle it is unsuitable it is excessive to prevent
Only to both wired backplanes and both, cable architecture bottom cushion 23 is damaged, generally 5 °.In front of excavation face (wall for grouting 19)
22, the 5 meters of slip casting circulations of Full-face pouring pipe are set, range of grouting refers to accompanying drawing.Constructing tunnel order be：First construct No. 1
After tunnel, No. 1 tunnel 8~10m of drilling depth, No. 3 tunnels of constructing, after No. 3 tunnel 8~10m of drilling depth, the lower bar tunnel of construction is applied successively
Work completes four single-track tunnels；Constructing tunnel is using interim inverted arch is aided in, and tunnel uses step method, up/down steps
Spacing staggers 3~5m, and top bar stays Core Soil 18, and each step uses 1 according to soil layer situation：(0.7~1.0) slope.Appear on the stage
Lock pin anchor tube 14 is set at rank grid arch springing, lock pin anchor tube slip casting situation is with small pilot tunnel.
Step 8, just branch backfill slip casting behind is carried out with face follow-up, and backfill Grouting Pipe 20 is pre-buried during grid to erect
In first branch behind, grouting pressure is controlled in 0.5~1.0Mpa, it is ensured that proposed circuit and both cable architecture part tights, forms firm
Property contact, strengthen the length of service and both wired stabilizations of ready-built structure.
Hydraulic support automatic control system and hydraulic jack should be kept a close eye on during being worn under step 9, main track tunnel
Top lift, while strengthen building up station measuring point data analysis, pinpoint the problems in time, interval operation worn under guidance.Once both
When Wireline sedimentation value reaches early warning value, it should stop excavating, front cover slip casting, and study next step countermeasure.
Step 10, under wear and prop up at the beginning of running tunnel after the completion of, apply secondary lining, poured when secondary lining is poured using with pressure
Build, carry out pouring for two side simultaneously specifically by spandrel sprue gate 26, with rear enclosed spandrel sprue gate, poured by vault
Mouth 25 carries out pouring for arch crown parts, while paying close attention to the reading of pouring pressure sensor 24, controls the amount of pouring, reaches maximum
The filling of limit, prevents from pouring that pressure is excessive to be damaged to template, deform, and influence two serves as a contrast the impression qualities of concrete.Pour
After building completion, it is ensured that the compactness of concrete, particularly arch crown part do not produce cavity, the intensity of concrete, reduction are influenceed
The service life of structure；Along tunnel, longitudinally point construction sections of a 6~8m mono- progress temporary support is cut, and carries out two lining constructions.This section two
Lining structure construction is completed and concrete strength is reached after design strength, then carries out the temporary support of adjacent segment and cut.
So far operation completion is worn down.
Claims (8)
1. the embodiment at existing station is worn under a kind of large span running tunnel super close distance, it is characterised in that：Comprise the following steps：
(1) is in both wired arrangement measuring points, when wearing operation under monitoring, both wired sedimentations, and sets up monitor value analysis and automatic pre-
Alert system, under wear operation is monitored in real time；
(2) Full-face pouring is carried out before excavating shafts, the small pilot tunnel of avris of constructing, small pilot drive, pilot tunnel surrounding soil is reinforced, is
The jacking of jack provides bearing；Small pilot drive uses Mining Method, and support form is grid+in-network processing, is followed strictly
The tunneling " ten Eight Terms Guidelines " of " pipe is advanced, tight slip casting, short excavation, strong supporting, and fast closing, duty is measured ", Ring Cutting reserves core
Cubsoil；PVC sleeve pipes are worn to grid reinforcing bar in hydraulic jack position, reinforcing bar is protected, can reduce and abolish when the later stage cuts top
The amount of labour；
(3) applies strip footing in small pilot tunnel, when strip footing is constructed, in hydraulic jack correspondence position pre-embedded steel slab, and
Make jack base stopper slot；
(4) is released the position of jack by survey crew, and Zhi Jinhang at the beginning of small pilot tunnel is abolished, and preferably selects water drilling to cut, reduction pair
Both wired disturbance, pneumatic pick can be used to be abolished, abolishes hole diameter preferably than hydraulic jack nominal diameter when appropriate
Big 15cm or so；
(5) the artificial diggings of, install jack, and jack end is arranged in the stopper slot of strip footing, and other end passes through soft
Property pad withstand on both bottom plates of cable architecture, it is ensured that the perpendicularity of jack when installing jack, orifice position is carried out
Closed processes, jack sets hydraulic jack protective case before hole installation is entered on the outside of it, and protective case requires that airtight performance is good
It is good, and be elastomeric material, in jack end and jack colligation, do shell nosing treatment, it is ensured that during backfill slip casting, jack can
It is normal that top lift is provided；
Meanwhile, concrete backfill pipe is set in protective case outer layer, three slurry mouths that overflow are set on concrete backfill pipe, to ensure to fill
Packing is real, improves the stress performance of structure, and three slurry mouths that overflow set Opening pressures, be followed successively by from the bottom up 0.2M, 0.5Mpa,
1.0Mpa；Set three concretes to backfill pipe around each jack, it is ensured that backfill is up backfilled successively from bottom, it is ensured that backfill it is close
Solidity；
Jack from can automatic regulation type hydraulic jack, in the small pilot tunnel construction stage, hydraulic jack is provided just
Beginning top lift, the size of initial top lift should be can control pilot drive and both wired be settled into standard；Jack jacking is completed
Afterwards, to small pilot tunnel vault slotting position, arrangement backfill filling system is reinforced because excavating the crack produced, and carry out aperture
Seal operation；
(7) after treats that the small pilot drive completion in both sides and jack jacking are completed, the construction of Under-cross tunnel main track is carried out, in view of under
The risk worn, the present invention increases the method for fulcrum to improve down the safety coefficient worn using " cross-cut ", and due to single hole
Construction technology engineering method is simple, and supporting difficulty is smaller, so for wearing construction under, can improve the progress of construction；
(8) main tracks, which are excavated, uses u-shaped cross-section, carries out Full-face pouring before excavating, it is ensured that the globality rigidity of tunnel structure,
The risk factor during later stage operation is reduced, tunnel advanced deep hole grouting should be especially carried out, it is ensured that safe excavation, up/down steps
Method, Ring Cutting remaining core soil in advance, set lock pin anchor tube, and carry out slip casting to lock pin anchor tube, and should carry out the advanced branch in tunnel
Shield measure；
Main tracks Tunnel construct when, should supporting in the early stage behind, reserve behind backfill Grouting Pipe, fill it is both wired
With the space between newly built tunnels structure, it is ensured that two structures carry out rigid contact；
(10) after the completion of preliminary bracings, tunnel double-lining construction is carried out, operation completion is so far worn down.
2. wearing the embodiment at existing station under a kind of large span running tunnel super close distance according to claim 1, it is special
Levy and be：Step (1) described point layout in the range of Under-cross tunnel one times of span of construction, i.e., using Under-cross tunnel center line as
Center extends to both sides.
3. wearing the embodiment at existing station under a kind of large span running tunnel super close distance according to claim 1, it is special
Levy and be：(2) step in described Mining Method, sets lock foot anchoring stock at grid arch springing, and lock pin anchor tube uses steel welded tube, locks pin
Anchor tube carries out grouting and reinforcing arch springing in time with drilling depth, prevents the globality of small pilot tunnel from sinking；Lock the slip casting of pin anchor tube and use single liquid water
Mud, grouting pressure is controlled in 0.5~1.0Mpa.
4. wearing the embodiment at existing station under a kind of large span running tunnel super close distance according to claim 3, it is special
Levy and be：Step is (8) described to set lock pin anchor tube, and carries out its specific steps of slip casting and small pilot tunnel Mining Method to lock pin anchor tube
In it is identical.
5. wearing the embodiment at existing station under a kind of large span running tunnel super close distance according to claim 1, it is special
Levy and be：Operation is worn under whole, monitoring is digitized to the top lift of jack, and energy is uneven according to both wired structure
Sedimentation carry out otherness regulation jacking, it is ensured that both cable architecture be deposited in it is controllable within the scope of.
6. wearing the embodiment at existing station under a kind of large span running tunnel super close distance according to claim 1, it is special
Levy and be：In work progress, a set of hydraulic pressure support structure is used, the hydraulic pressure support structure includes jack, protective case, led to
Long steel plate, deep floor and flexible liner, described jack is multiple, and it is set along small pilot tunnel longitudinal axis direction, each
Jack from can automatic regulation type hydraulic jack, the base of each jack is installed in small pilot tunnel strip footing
In stopper slot, and base and the pre-embedded steel slab fixation of jack, elongated steel plate and deep floor are set on jack base；
Protective case is respectively provided with the outside of each jack, the telescopic end of jack is encapsulated in inside protective case, and protective case is in jack
Shell nosing treatment is done with jack colligation in end；The upper end of each jack and protective case withstands on existing knot by flexible liner
On the bottom plate of structure.
7. wearing the embodiment at existing station under a kind of large span running tunnel super close distance according to claim 6, it is special
Levy and be：Three concrete backfill pipes are respectively provided with the protective case outer layer of each jack, three are set on concrete backfill pipe
Individual excessive slurry mouth, three overflow slurry mouths Opening pressures increase successively from the bottom up, concrete backfill bottom of the tube set stop grouting plug and
Backing plate.
8. wearing the embodiment at existing station under a kind of large span running tunnel super close distance according to claim 6, it is special
Levy and be：A pressure sensor, pressure sensor connection control valve group, synchronous liquid are arranged in each hydraulic jack
Press pump station is simultaneously connected through signal wire with PLC Multi-thread control devices.
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| CN112253142A (en) * | 2020-11-27 | 2021-01-22 | 鲁东大学 | Construction method for short-clear-distance upward-crossing main tunnel of connecting air duct of deep and long tunnel |
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