CN104389610B - A kind of ultrashort step construction method of traversing operation freeway tunnel - Google Patents

A kind of ultrashort step construction method of traversing operation freeway tunnel Download PDF

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Publication number
CN104389610B
CN104389610B CN201410491528.3A CN201410491528A CN104389610B CN 104389610 B CN104389610 B CN 104389610B CN 201410491528 A CN201410491528 A CN 201410491528A CN 104389610 B CN104389610 B CN 104389610B
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construction
tunnel
pipe
steelframe
inverted arch
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CN104389610A (en
Inventor
苗增润
马殷军
徐润泽
宋战平
王忠双
潘大鹏
陈国彬
徐宏鹏
牛泽林
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Second Engineering Co Ltd of China Railway Construction Bridge Engineering Bureau Group Co Ltd
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Second Engineering Co Ltd of China Railway Construction Bridge Engineering Bureau Group Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/003Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F17/00Methods or devices for use in mines or tunnels, not covered elsewhere
    • E21F17/18Special adaptations of signalling or alarm devices

Abstract

The present invention relates to a kind of ultrashort step construction method of traversing operation freeway tunnel, the detailed process is:Long pipe shed is constructed;Respectively to being oriented to wall and pipe roof construction, it is oriented to progress face-upward slope before wall construction and excavates brush slope, the face-upward slope brush slope gradient is 1: 1, brushing the slope gradient below the excavation line of hole top is adjusted to 1: 0.2;Using double-deck supporting, tunnel is using double-deck preliminary bracing;Highway, which is led, to be changed;Using the interim inverted arch method construction of three steps, successively upper step, middle bench, lower step and bottom tunnel are excavated, and is progressively constructed using inverted arch engineering method;Supporting construction stress automatic monitoring system;Monitoring device is set on tunnel cross-section, and the information of displacement deformation and soil pressure change to tunnel is acquired and handled, in real time monitoring constructing tunnel situation;Secondary lining is closelyed follow.The more traditional engineering method working security of construction method of the present invention is high, the fast short time limit of construction speed, and the few machinery in portion and allocation of labor resources are low.

Description

A kind of ultrashort step construction method of traversing operation freeway tunnel
Technical field
The present invention relates to constructing tunnel field, more particularly to a kind of ultrashort step construction side of traversing operation freeway tunnel Method.
Background technology
Today's society, the development of traffic system directly governs the development of national comprehensive strength.In the landform that China is complicated In there are a large amount of drift sand stratum, drift sand stratum is different from general soft rock, soil characteristics, and it has rheological characteristic, causes the stratum tunnel Road cavitation is difficult, and stability is poor, and supporting difficulty is big.
It is larger in existing operation highway section constructing tunnel difficulty at present, complicated construction technique, for the formation tunnel Construction speed is slow, and stability is poor, and working security is low.
In view of the demand, creator of the present invention obtains this creation finally by prolonged research and practice.
The content of the invention
It is an object of the invention to provide a kind of ultrashort step construction method of traversing operation freeway tunnel, to overcome Above-mentioned technological deficiency.
To achieve the above object, the present invention provides a kind of ultrashort step construction method of traversing operation freeway tunnel, should Detailed process is:
Step a, long pipe shed construction;Respectively to being oriented to wall and pipe roof construction, it is oriented to progress face-upward slope before wall construction and excavates brush Slope, the face-upward slope brush slope gradient is 1: 1, and the brush slope gradient is adjusted to 1: 0.2 below the excavation line of hole top;
Step b, using double-deck supporting, tunnel is using double-deck preliminary bracing;
Step c, highway, which is led, to be changed;
Step d, is constructed using the interim inverted arch method of three steps, successively to upper step, middle bench, lower step and bottom Tunnel is excavated, and is progressively constructed using inverted arch engineering method;
Step e, supporting construction stress automatic monitoring system;Monitoring device is set on tunnel cross-section, to the position in tunnel The information for moving deformation and soil pressure change is acquired and handled, in real time monitoring constructing tunnel situation;
Step f, secondary lining is closelyed follow;According to surrounding rock tunnel monitoring measurement situation, tunnel overall deformation tends towards stability, i.e., Temporary support can be progressively removed, construction two serves as a contrast concrete.
Further, in above-mentioned steps d, Specific construction process is:
Step d1, excavates upper step;Upper step is excavated, advance support, the preliminary bracing of top barrel structure is applied;
Step d2, excavates middle bench;Top bar is excavated after 3~5m, opens middle bench, spreading steelframe applies barrel knot The preliminary bracing of structure and interim inverted arch supporting;
Step d3, excavates lower step;Lower step is excavated, preliminary bracing is applied;
Step d4, excavates bottom tunnel bottom;Excavate bottom tunnel bottom, drilling depth 3m is excavated in often circulation, applies preliminary bracing, initial stage branch Book jacket closes cyclization;
Step d5, inverted arch construction;
Step d6, the lining construction of arch wall two;It is 9m by design of tunnel lining trolley, during inverted arch filling 9~10m of construction, you can construction Arch wall lining cutting.
Further, in above-mentioned steps d1 and d2, steelframe is erected, system anchor bolt, gunite concrete is drilled with.Due to for bilayer First branch bow member, two layers just branch bow member need to stagger 2 Pin, i.e., apart from 1m.
Further, in above-mentioned steps d5, the detailed process of inverted arch construction is:Analyzed according to monitoring and measurement data, and When apply inverted arch, it is ensured that first Zhi Wending;Inverted arch excavation is performed, drilling depth 3m is excavated in often circulation;The lining of inverted arch two is performed, the construction one per 6m It is secondary;Inverted arch filling is performed, is constructed once per 6m.
Further, in above-mentioned steps a, wall thickness 1m, long 1.2m are oriented to, wall is oriented to and sets three Pin I20b i-beam frames, work Guide pipe is welded on the outside of word steel, guide pipe uses the steel pipes of φ 200, be oriented to wall and use C25 concrete, set interior I20b bow members to reinforce Support.It is 5 units per Pin steelframes;Excavate absolute altitude:48cm below spring line, is to pour a concrete foundation at 5cm bow member pin, Wide 1m, deep 0.5m, the long 1.5m in longitudinal direction, interior outside bow member spacing 10cm, template are padded between template and bow member and adopted between 5cm cushion blocks, steelframe With the bar connectings of φ 22, spacing 1m;It is close to face upward slope soil layer in vault center, the pre-buried termination of guide pipe.
Further, in above-mentioned steps a, during pipe roof construction,
Step a21, first does preparation of construction, and face is oriented to after wall completion, and unnecessary Core Soil is excavated, Core Soil slope linked network Spray anchor;During step a22, pipe roof construction, pipe canopy is processed first;
Steel reinforcement cage, filling concrete mortar in pipe are laid in step a23, processing;Steel reinforcement cage is 4 reinforcing bars of Φ 18, and retainer ring is adopted Cyclization is cut with the steel pipes of Φ 42, length is 5cm, and spacing 1.5m, arranged for interval is fixed, and tip is made in front end using steel pipe; After pipe boron steel pipe is installed, by steel reinforcement cage segmentation push-in pipe boron steel pipe;Junction carries out reinforcement of weld using set Φ 42 steel pipes, Pipe canopy fills M20 cement mortar, is sealed after filling up.
Further, in above-mentioned steps a22, the every pipe canopy length of Φ 159 is 51m, is made up of plurality of sections of steel pipes, and mutually Stagger, often save length be 4,4.5,6m, wherein first segment pipe canopy head processing it is tapered, length is 30cm;Connect and use between pipe canopy Screwed connection, often saves Guan Peng two ends, and interior screw thread is processed into one end, and male thread is processed into one end, and screw thread length is 15cm;Pipe canopy The first long 30cm in pipe front end cuts angle, and half is cut away in termination;Width 16cm, long 40cm, thick 15mm steel plates full weld are used again.
Further, in above-mentioned steps c, its detailed process is:
Step c1, relieves traffic congestion to highway uplink, the Emergency Vehicle Lane and normal lane of downlink are closed, entered Row descending line segment region tunnel excavation and lining cutting;
Step c2, relieves traffic congestion to highway downlink, carries out uplink region tunnel excavation support and two lining constructions;
Step c3, relieves traffic congestion to highway uplink, the Emergency Vehicle Lane and normal lane of downlink are closed, entered In the middle of row downlink region tunnel excavation support and two lining constructions, construction to isolation strip;
Step c4, relieves traffic congestion to highway downlink, carries out uplink region tunnel excavation support and two lining constructions; It is fully completed after the completion of two linings, recovers highway normal pass.
Further, in the interim inverted arch method work progress of three step, tunnel excavation is backbreak part, with equal label Jetting cement spray is full, and arch prevents cavity or leakiness phenomenon occur;Lock pin anchor tube installs " L " type muscle and steelframe firm welding;Steel Frame bolt ensures quantity, and tightens, and there is space to connecting plate, and filling steel plate or reinforcing bar carry out full weld;Top bar and middle Rank steelframe base pad sets feet channel-section steel, and steelframe footing of getting out of a predicament or an embarrassing situation, which can be padded, sets plank;Middle step installs interim inverted arch steelframe, and with forever Long steelframe is connected firmly.
Further, in above-mentioned steps a, support is beaten using steel pipe, the lumps of wood between steelframe and Core Soil, support stands on firm Ground, or place plank etc. and play support again, formwork reinforcement is firm;Steelframe and guide pipe install rear branching standing template, and guide pipe is pressed It is embedding according to predetermined angular, to prevent bow member during casting concrete, guide pipe from sinking, 2 are increased than design angle when pacifying guide pipe processed Degree, and each hole will be faced upward with horizontal dipstick metering pair, top, it is oblique outside the left and right sides.
Compared with prior art the beneficial effects of the present invention are:The more traditional engineering method construction safety of construction method of the present invention Property high, the fast short time limit of construction speed, the few machinery in portion and allocation of labor resources be low, and concatenation construction deviation of steelframe is small, initial stage Supporting construction quality is high, and setting up main tunnel, just branch bow member overall structure speed is fast;This engineering method technique compared with traditional engineering method is simple.Drop The low technical requirements to workmen, it is to avoid due to variety of problems that human users trigger in construction.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the ultrashort step construction method of traversing operation freeway tunnel of the present invention;
Fig. 2 is downlink region of the present invention tunnel excavation support and two lining construction schematic diagrames;
Fig. 3 is tunnel entrance tunnel of the present invention and highway relation sectional drawing;
Fig. 4 is the interim inverted arch method sectional drawing of three step of the invention.
Embodiment
Below in conjunction with accompanying drawing, the forgoing and additional technical features and advantages are described in more detail.
Refer to shown in Fig. 1, it shows for the flow of the ultrashort step construction method of traversing operation freeway tunnel of the present invention It is intended to, then the construction just there are three benching tunnelling methods to be constructed first to set firm guide support structure.The detailed process is:
Step a, long pipe shed construction;
Step a1, is oriented to wall construction;It is oriented to before wall construction and carries out face-upward slope excavation brush slope, the face-upward slope brush slope gradient is 1: 1, The brush slope gradient is adjusted to 1: 0.2 below the excavation line of hole top.
It is oriented to wall thickness 1m, long 1.2m.It is oriented to wall and sets weldering guide pipe, guide pipe on the outside of three Pin I20b i-beam frames, I-steel Using the steel pipes of φ 200.It is oriented to wall and uses C25 concrete, sets interior I20b bow members to do reinforcing support.It is 5 units per Pin steelframes.
Excavate absolute altitude:48cm below spring line.A concrete foundation is poured at bow member pin, wide 1m, deep 0.5m, longitudinal direction are long 1.5m, interior outside bow member spacing 10cm, is 5cm templates, is padded between template and bow member between 5cm cushion blocks, steelframe using the reinforcing bars of φ 22 company Connect, spacing 1m.
Because the brush slope gradient below the excavation line of hole top is 1: 0.2, it is oriented at wall arch springing and is oriented to the long 1.2m of wall, vault center Place, the pre-buried termination of guide pipe is close to face upward slope soil layer, and exposed parts carry out sealing and blocked, prevent from being mixed into mud in steel pipe, otherwise can Influence construction angle.The about long 3.5m of guide pipe.To ensure stability of slope, being oriented to wall concrete also increases length, to side slope face.
Because section is larger, inner side clay model is difficult to shape, and support is played using steel pipe, the lumps of wood between steelframe and Core Soil, supports Firm ground is stood on, or places plank etc. and plays support again, formwork reinforcement is firm.Steelframe and guide pipe install rear branching standing template, Guide pipe is embedding according to predetermined angular, to prevent bow member during casting concrete, guide pipe from sinking, and design angle is compared when pacifying guide pipe processed Degree increases 2 degree, and each hole will be faced upward with horizontal dipstick metering pair, top, oblique outside the left and right sides.Other import is radius 1200m Curve, left and right sides guide pipe install when, on curve influence adjusted.Formwork support arrangement has reinforced after-pouring concrete, Steelframe and template stressing conditions are observed during concreting, to control concreting speed.
Step a2, pipe roof construction;
Before step a21, pipe roof construction, preparation of construction is first done, face is oriented to after wall completion, and unnecessary Core Soil is excavated, core Cubsoil slope suspended net shotcrete.
According to the actual geological condition in scene, air drill is beaten using down-the-hole and carried out with the water drilling two ways for being oriented to test, Lower at 1.5 meters of Core Soil to dig 80 centimeters, first the ditch of one 30 centimeters of digging, digs 5 meters of length and width behind the left and right sides in addition, The puddle of 1.2~1.5 meters of depths, the circulating water pool as brill of fetching water.
Concrete hardening is used before guiding wall for 6 meters.
During step a22, pipe roof construction, pipe canopy is processed first;In the present embodiment, the every pipe canopy of Φ 159 is long Spend for 51m, be made up of, mutually to stagger to meet design requirement pipe joint plurality of sections of steel pipes, often save length be 4,4.5,6m, wherein The processing of first segment pipe canopy head is tapered, and length is 30cm;Connection uses screwed connection between pipe canopy, often saves Guan Peng two ends, one end adds Work is into interior screw thread, and male thread is processed into one end, and screw thread length is 15cm.The first long 30cm in pipe front end of pipe canopy cuts angle, termination Cut away half.Width 16cm, long 40cm, thick 15mm steel plates full weld are used again.
During pipe roof construction, brill strictly is applied by key points for operation, rotating speed and progress is controlled, while noting boring with drilling The plateau of machine and the vertical stable state till now of drilling rod.Generation difference and shutdown inspection, the drilling to generation is inclined in time Difference is corrected, and prevents useless hole.
Connected between pipe canopy in addition to using screwed connection, also in outside, with the weldering of steel pipe Ge Tiaojin trade associations, there is provided the entirety of steel pipe Property.
Whole hole inspection is carried out per hole, the deviation of hole position, the deviant of whole nose end are not more than 10cm, and mustn't invade excavation Periphery, drilling process carries out guiding test, for being redrilled after bending, the filling of overmigration hole.The physical length that pipe canopy is squeezed into is not Less than the 90% of design length.
Steel reinforcement cage, filling concrete mortar in pipe are laid in step a23, processing;
Steel reinforcement cage is 4 reinforcing bars of Φ 18, and retainer ring cuts cyclization using the steel pipes of Φ 42, and length is 5cm, spacing 1.5m, It is fixed every arrangement, front end is processed in advance before making tip, installing pipe canopy using steel pipe.
After pipe boron steel pipe is installed, by steel reinforcement cage segmentation push-in pipe boron steel pipe.Junction is carried out using set Φ 42 steel pipes Reinforcement of weld.Pipe canopy fills M20 cement mortar, is sealed after filling up.
Step b, using double-deck supporting;
To ensure tunnel safety and highway operation security, tunnel uses I22 using double-deck preliminary bracing, outer layer I-steel, internal layer uses I20b I-steel, spacing 0.5m.
Step c, highway, which is led, to be changed;
Step c4, relieves traffic congestion to highway uplink, the Emergency Vehicle Lane and normal lane of downlink are closed, entered Row descending line segment region tunnel excavation and lining cutting;
Step c2, relieves traffic congestion to highway downlink, carries out uplink region tunnel excavation support and two lining constructions;
Step c3, relieves traffic congestion to highway uplink, the Emergency Vehicle Lane and normal lane of downlink are closed, entered In the middle of row downlink region tunnel excavation support and two lining constructions, construction to isolation strip.
Step c4, relieves traffic congestion to highway downlink, carries out uplink region tunnel excavation support and two lining constructions; It is fully completed after the completion of two linings, recovers highway normal pass.
Step d, is constructed using the interim inverted arch method of three steps;
Step d1, excavates upper step;
It is upper step to excavate 1. portion;
The 1. portion i.e. advance support of top barrel structure, preliminary bracing is applied, steelframe is erected, is drilled with system anchor bolt, is sprayed Concrete.Due to the branch bow member at the beginning of bilayer, two layers just branch bow member need to stagger 2 Pin, i.e., apart from 1m.
Step d2, excavates middle bench;
Top bar is excavated after 3~5m, and 2. portion of excavating is middle bench, and spreading steelframe applies the preliminary bracing of barrel structure And interim inverted arch supporting, steelframe is erected, system anchor bolt, gunite concrete is drilled with.Due to the branch bow member at the beginning of bilayer, two layers of first branch arch Frame need to stagger 2 Pin, i.e., apart from 4m.
Step d3, excavates lower step;
It is lower step to excavate 3. portion, applies preliminary bracing, erects steelframe, is drilled with system anchor bolt, gunite concrete.Due to The branch bow member at the beginning of bilayer, two layers just branch bow member need to stagger 2 Pin, i.e., apart from 1m.
Step d4, excavates bottom tunnel bottom;
4. portion namely bottom tunnel bottom are excavated, drilling depth 3m is excavated in often circulation, apply preliminary bracing, preliminary bracing closing cyclization.
Step d5, inverted arch construction;The process is:
Analyzed according to monitoring and measurement data, inverted arch is applied in time, it is ensured that first Zhi Wending;
Inverted arch excavation is performed, drilling depth 3m is excavated in often circulation;
The lining of inverted arch two is performed, is constructed once per 6m;
Inverted arch filling is performed, is constructed once per 6m;
Step d6, the lining construction of arch wall two;
Lining cutting, the 12m designs of lining trolley not routinely can be carried out to reduce digging distance, but lining trolley is set 9m is calculated as, during inverted arch filling 9~40m of construction, you can construction arch wall lining cutting.
In the interim inverted arch method work progress of three step, the distance between each substep is strictly controlled;Strict control is super The construction quality and quantity of preceding supporting measure;Tunnel excavation is backbreak part, sprays full with the jetting cement of equal label, arch prevents Existing cavity or leakiness phenomenon;Steelframe is locked pin anchor tube and lock foot anchoring stock and strictly constructed by design, and lock pin anchor tube installs " L " type Muscle and steelframe firm welding;Steelframe bolt ensures quantity, and tightens, and there is space to connecting plate, and filling steel plate or reinforcing bar enter Row full weld;Top bar and middle step steelframe base pad set feet channel-section steel, and steelframe footing of getting out of a predicament or an embarrassing situation, which can be padded, sets plank;Middle step is installed Interim inverted arch steelframe, and be connected firmly with permanent steelframe.
Step e, supporting construction stress automatic monitoring system;Monitoring device is set on tunnel cross-section, passes through sensor Group, data/address bus, automatic data collection case are acquired and handled to the information of displacement deformation and the soil pressure change in tunnel, in real time Monitor constructing tunnel situation.
Step f, secondary lining is closelyed follow;According to surrounding rock tunnel monitoring measurement situation, tunnel overall deformation tends towards stability, i.e., Temporary support can be progressively removed, construction two serves as a contrast concrete.
Presently preferred embodiments of the present invention is the foregoing is only, is merely illustrative for invention, and it is nonrestrictive. Those skilled in the art understands, can carry out many changes to it in the spirit and scope that invention claim is limited, and changes, It is even equivalent, but fall within protection scope of the present invention.

Claims (7)

1. a kind of ultrashort step construction method of traversing operation freeway tunnel, it is characterised in that detailed process is:
Step a, long pipe shed construction;Respectively to being oriented to wall and pipe roof construction, it is oriented to progress face-upward slope before wall construction and excavates brush slope, side It is 1: 1 to face upward the slope brush slope gradient, and the brush slope gradient is adjusted to 1: 0.2 below the excavation line of hole top;
Step b, using double-deck supporting, tunnel is using double-deck preliminary bracing;
Step c, highway, which is led, to be changed;
Step d, is constructed using the interim inverted arch method of three steps, successively to upper step, middle bench, lower step and bottom tunnel Excavated, and progressively constructed using inverted arch engineering method;
Step e, the monitoring of supporting construction stress automatic monitoring system;Monitoring device is set on tunnel cross-section, to the position in tunnel The information for moving deformation and soil pressure change is acquired and handled, in real time monitoring constructing tunnel situation;
Step f, secondary lining is closelyed follow;According to surrounding rock tunnel monitoring measurement situation, tunnel overall deformation tends towards stability, you can by Step removes temporary support, and construction two serves as a contrast concrete;
Wherein, in above-mentioned steps d, Specific construction process is:
Step d1, excavates upper step;Upper step is excavated, advance support, the preliminary bracing of top barrel structure is applied;
Step d2, excavates middle bench;Top bar is excavated after 3~5m, opens middle bench, spreading steelframe applies barrel structure Preliminary bracing and interim inverted arch supporting;
Step d3, excavates lower step;Lower step is excavated, preliminary bracing is applied;
Step d4, excavates bottom tunnel bottom;Bottom tunnel bottom is excavated, drilling depth 3m is excavated in often circulation, apply preliminary bracing, preliminary bracing envelope Close cyclization;
Step d5, inverted arch construction;
Step d6, the lining construction of arch wall two;It is 9m by design of tunnel lining trolley, during inverted arch filling 9~10m of construction, you can construction arch wall Lining cutting;
In above-mentioned steps d1 and d2, steelframe is erected, system anchor bolt, gunite concrete, due to the branch bow member at the beginning of bilayer, two layers is drilled with First branch bow member need to stagger 2 Pin, i.e., apart from 1m;
In above-mentioned steps d5, the detailed process of inverted arch construction is:Analyzed according to monitoring and measurement data, inverted arch is applied in time, protected The first Zhi Wending of card;Inverted arch excavation is performed, drilling depth 3m is excavated in often circulation;The lining of inverted arch two is performed, is constructed once per 6m;Inverted arch is performed to fill out Fill, constructed once per 6m.
2. the ultrashort step construction method of traversing operation freeway tunnel according to claim 1, it is characterised in that upper State in step a, be oriented to wall thickness 1m, long 1.2m, be oriented to wall and set weldering guide pipe on the outside of three Pin I20b i-beam frames, I-steel, be oriented to Pipe uses the steel pipes of φ 200, is oriented to wall and uses C25 concrete, sets interior I20b bow members to do reinforcing support, is 5 lists per Pin steelframes Member;Excavate absolute altitude:48cm below spring line, is that a concrete foundation is poured at 5cm bow member pin, wide 1m, deep 0.5m, and longitudinal direction is long 1.5m, interior outside bow member spacing 10cm, template pad between template and bow member and the bar connectings of φ 22 are used between 5cm cushion blocks, steelframe, Away from 1m;It is close to face upward slope soil layer in vault center, the pre-buried termination of guide pipe.
3. the ultrashort step construction method of traversing operation freeway tunnel according to claim 1, it is characterised in that upper State in step a, during pipe roof construction,
Step a21, first does preparation of construction, and face is oriented to after wall completion, and unnecessary Core Soil is excavated, the spray of Core Soil slope linked network Anchor;During step a22, pipe roof construction, pipe canopy is processed first;
Steel reinforcement cage, filling concrete mortar in pipe are laid in step a23, processing;Steel reinforcement cage is 4 reinforcing bars of Φ 18, and retainer ring uses Φ 42 steel pipes cutting cyclization, length is 5cm, and spacing 1.5m, arranged for interval is fixed, and tip is made in front end using steel pipe;Pipe canopy After penstock installation is good, by steel reinforcement cage segmentation push-in pipe boron steel pipe;Junction carries out reinforcement of weld, pipe canopy using set Φ 42 steel pipes M20 cement mortar is filled, is sealed after filling up.
4. the ultrashort step construction method of traversing operation freeway tunnel according to claim 3, it is characterised in that upper State in step a22, every pipe canopy length of Φ 159 is 51m, is made up of plurality of sections of steel pipes, and is mutually staggered, often save length be 4,4.5, 6m, wherein first segment pipe canopy head processing are tapered, and length is 30cm;Connection uses screwed connection between pipe canopy, often saves Guan Peng two ends, Interior screw thread is processed into one end, and male thread is processed into one end, and screw thread length is 15cm;The first long 30cm in pipe front end of pipe canopy is cut tiltedly Mouthful, half is cut away in termination;Width 16cm, long 40cm, thick 15mm steel plates full weld are used again.
5. the ultrashort step construction method of traversing operation freeway tunnel according to claim 1, it is characterised in that upper State in step c, its detailed process is:
Step c1, relieves traffic congestion to highway uplink, the Emergency Vehicle Lane and normal lane of downlink are closed, under progress Line section region tunnel excavation and lining cutting;
Step c2, relieves traffic congestion to highway downlink, carries out uplink region tunnel excavation support and two lining constructions;
Step c3, relieves traffic congestion to highway uplink, the Emergency Vehicle Lane and normal lane of downlink are closed, under progress In the middle of line region tunnel excavation support and two lining constructions, construction to isolation strip;
Step c4, relieves traffic congestion to highway downlink, carries out uplink region tunnel excavation support and two lining constructions;All Complete after the completion of two linings, recover highway normal pass.
6. the ultrashort step construction method of traversing operation freeway tunnel according to claim 1, it is characterised in that at this In the interim inverted arch method work progress of three steps, tunnel excavation is backbreak part, sprays full with the jetting cement of equal label, arch prevents Existing cavity or leakiness phenomenon;Lock pin anchor tube installs " L " type muscle and steelframe firm welding;Steelframe bolt ensures quantity, and tightens, There is space to connecting plate, filling steel plate or reinforcing bar carry out full weld;Top bar and middle step steelframe base pad set feet channel-section steel, Steelframe footing of getting out of a predicament or an embarrassing situation, which can be padded, sets plank;Middle step installs interim inverted arch steelframe, and is connected firmly with permanent steelframe.
7. the ultrashort step construction method of traversing operation freeway tunnel according to claim 1, it is characterised in that upper State in step a, support is beaten using steel pipe, the lumps of wood between steelframe and Core Soil, firm ground is stood in support, or place plank and beat branch again Support, formwork reinforcement is firm;Steelframe and guide pipe install rear branching standing template, and guide pipe is embedding according to predetermined angular, to prevent from pouring Bow member, guide pipe sink when building concrete, and 2 degree are increased than design angle when pacifying guide pipe processed, and each hole will use horizon rule Amount pair, top is faced upward, oblique outside the left and right sides.
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