CN104389610A - Construction method of ultrashort steps crossing operational expressway tunnel - Google Patents

Construction method of ultrashort steps crossing operational expressway tunnel Download PDF

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Publication number
CN104389610A
CN104389610A CN201410491528.3A CN201410491528A CN104389610A CN 104389610 A CN104389610 A CN 104389610A CN 201410491528 A CN201410491528 A CN 201410491528A CN 104389610 A CN104389610 A CN 104389610A
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China
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construction
tunnel
pipe
excavation
steelframe
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CN201410491528.3A
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CN104389610B (en
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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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中铁建大桥工程局集团第二工程有限公司
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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 invention relates to a construction method of ultrashort steps crossing operational expressway tunnel. The construction method comprises the following steps: a long pipe shed is constructed; a guide wall and the pipe shed are respectively constructed; a slope is dig and brushed before the guide wall is constructed; the slope brushing gradient is 1: 1; the slope brushing gradient is adjusted to 1: 0.2 below a tunnel top digging line; two layers of supports are adopted; the tunnel adopt two layers of primary supports; an expressway is modified; a three-step temporary inverting method is used for constructing; an upper step, a middle step, a lower step and a bottom tunnel are dig in sequence; an inverting construction method is used for gradually constructing; the support structure is stressed by an automatic monitoring system; a monitoring device is arranged on the section of the tunnel for acquiring and processing information of tunnel displacement deformation and soil pressure change of the tunnel and monitoring the tunnel construction conditions in real time; and a secondary lining is followed up. Compared with a traditional construction method, the construction method has the advantages of high construction safety, quick construction progress, short construction period and low allocation of part machines and labor resources.

Description

A kind of ultrashort step construction method of traversing operation freeway tunnel
Technical field
The present invention relates to constructing tunnel field, particularly relate to a kind of ultrashort step construction method of traversing operation freeway tunnel.
Background technology
Society, the development of traffic system directly governs the development of national comprehensive strength.In the landform of China's complexity, there is a large amount of drift sand stratum, drift sand stratum is different from general soft rock, soil characteristics, and it has rheological characteristic, and cause this formation tunnel cavitation difficulty, poor stability, supporting difficulty is large.
Comparatively large in existing operation highway section constructing tunnel difficulty at present, complicated construction technique, slow for this formation tunnel construction speed, poor stability, working security is low.
In view of the demand, creator of the present invention obtains this creation finally through long research and practice.
Summary of the invention
The object of the present invention is to provide a kind of ultrashort step construction method of traversing operation freeway tunnel, in order to overcome above-mentioned technological deficiency.
For achieving the above object, the invention provides a kind of ultrashort step construction method of traversing operation freeway tunnel, this detailed process is:
Step a, long pipe shed is constructed; Respectively to guiding wall and pipe roof construction, carry out face-upward slope excavation brush slope before the construction of guiding wall, the face-upward slope brush slope gradient is 1: 1, brushes the slope gradient and be adjusted to 1: 0.2 below the excavation line of top, hole;
Step b, adopts double-deck supporting, and tunnel adopts double-deck preliminary bracing;
Step c, speedway is led and is changed;
Steps d, adopts three step Temporary invert method constructions, successively excavates upper step, middle bench, lower step and tunnel, bottom, and adopt inverted arch engineering method progressively to construct;
Step e, the stressed automatic monitoring system of supporting and protection structure; Tunnel cross-section arranges monitoring device, the information that displacement deformation and the soil pressure in tunnel are changed and process, Real-Time Monitoring constructing tunnel situation;
Step f, closelying follow of secondary lining; According to surrounding rock tunnel monitoring measurement situation, tunnel bulk deformation tends towards stability, and progressively can remove temporary support, construction two lining concrete.
Further, in above-mentioned steps d, Specific construction process is:
Steps d 1, excavation upper step; Excavation upper step, applies the advance support of top barrel structure, preliminary bracing;
Steps d 2, excavation middle bench; Top bar after excavation 3 ~ 5m, open middle bench, spreading steelframe, apply preliminary bracing and the Temporary invert supporting of barrel structure;
Steps d 3, excavation lower step; Excavation lower step, applies preliminary bracing;
Steps d 4, at the bottom of the tunnel of excavation bottom; At the bottom of the tunnel of excavation bottom, often circulation excavation drilling depth 3m, apply preliminary bracing, ring is closed in preliminary bracing;
Steps d 5, inverted arch is constructed;
Steps d 6, arch wall two serves as a contrast construction; Be 9m by design of tunnel lining trolley, when construction 9 ~ 10m filled by inverted arch, arch wall lining cutting of can constructing.
Further, in above-mentioned steps d1 and d2, frame founds steelframe, is drilled with system anchor bolt, sprayed mortar.Owing to being a double-deck just bow member, a two-layer just bow member need stagger 2 Pin, i.e. distance 1m.
Further, in above-mentioned steps d5, the detailed process of inverted arch construction is: according to monitoring and measurement data analysis, apply inverted arch in time, ensures just Zhi Wending; Perform inverted arch excavation, often circulation excavation drilling depth 3m; Perform inverted arch two lining, every 6m construction once; Perform inverted arch to fill, every 6m construction once.
Further, in above-mentioned steps a, lead wall thickness 1m, long 1.2m, and three Pin I20b i-beam frames established by the wall that leads, and weld guide pipe outside i iron, and guide pipe adopts Φ 200 steel pipe, and guiding wall adopts C25 concrete, arranges interior I20b bow member and do reinforcing support.Every Pin steelframe is 5 unit; Excavation absolute altitude: 48cm below springing line, for 5cm bow member pin, place builds a concrete foundation, wide 1m, dark 0.5m, longitudinally long 1.5m, interior outside bow member spacing 10cm, and template, pads 5cm cushion block between template and bow member, adopt Φ 22 bar connecting, spacing 1m between steelframe; Vault center, the pre-buried termination of guide pipe is close to and is faced upward slope soil layer.
Further, in above-mentioned steps a, during pipe roof construction,
Step a21, first does preparation of construction, and after the completion of face guiding wall, unnecessary Core Soil is excavated, Core Soil slope suspended net shotcrete; Step a22, in pipe roof construction process, first processes pipe canopy;
Step a23, reinforcing cage, filling concrete mortar in pipe is laid in processing; Reinforcing cage is 4 Φ 18 reinforcing bars, and retainer ring adopts Φ 42 steel pipe to cut into ring, and length is 5cm, spacing 1.5m, and interval is arranged and is fixed, and front end adopts steel pipe to make tip; After pipe boron steel pipe installs, reinforcing cage segmentation is pushed in pipe boron steel pipe; Junction adopts cover Φ 42 steel pipe to carry out reinforcement of weld, and M20 cement mortar filled by pipe canopy, fills up rear sealing.
Further, in above-mentioned steps a22, every root Φ 159 pipe canopy length is 51m, is made up of, and mutually staggers plurality of sections of steel pipes, often save length be 4,4.5,6m, wherein the first pipe joint canopy head is processed into taper, and length is 30cm; Connect between pipe canopy and adopt screwed connection, every pipe joint canopy two ends, interior screw thread is processed in one end, and male thread is processed in one end, and screw thread length is 15cm; The first long 30cm in pipe front end of pipe canopy cuts angle, and half is cut away in termination; Use wide 16cm again, long 40cm, thick 15mm steel plate full weld.
Further, in above-mentioned steps c, its detailed process is:
Step c1, relieve traffic congestion speedway uplink, and Emergency Vehicle Lane and the normal lane of downlink are closed, and carry out descending line segment region tunnel excavation and lining cutting;
Step c2, relieve traffic congestion speedway downlink, carries out uplink region tunnel excavation support and two lining constructions;
Step c3, relieve traffic congestion speedway uplink, and Emergency Vehicle Lane and the normal lane of downlink are closed, and carries out downlink region tunnel excavation support and two lining constructions, in the middle of isolation strip of constructing;
Step c4, relieve traffic congestion speedway downlink, carries out uplink region tunnel excavation support and two lining constructions; All complete after two linings complete, recover speedway normal pass.
Further, in this three steps Temporary invert method work progress, tunnel excavation is backbreak part, and full with the jetting cement spray of equal label, arch stops to occur cavity or leakiness phenomenon; Lock pin anchor tube installs " L " type muscle and steelframe firm welding; Steelframe bolt ensures quantity, and tightens, and there is space to junction plate, fills steel plate or reinforcing bar carries out full weld; Top bar and middle step steelframe base pad establish feet channel-section steel, steelframe footing of getting out of a predicament or an embarrassing situation can pad establishes plank; Temporary invert steelframe installed by middle step, and is connected firmly with permanent steelframe.
Further, in above-mentioned steps a, adopt steel pipe, the lumps of wood plays support between steelframe and Core Soil, support and stand 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 embedding according to predetermined angular, and during for preventing concreting, bow member, guide pipe sink, 2 degree are strengthened than design angle during peace guide pipe processed, and the horizontal dipstick metering pair in each hole, face upward in top, oblique outside the left and right sides.
Beneficial effect of the present invention is compared with prior art: construction method of the present invention more traditional engineering method working security is high, the construction speed fast duration is short, portion lacks mechanical and allocation of labor resources is low, steelframe concatenation construction deviation is little, preliminary bracing construction quality is high, and setting up positive hole, just to prop up bow member overall structure speed fast; This engineering method technique compared with traditional engineering method is simple.Reduce the technical requirements to constructor, avoid the variety of problems due to human users's initiation in construction.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the ultrashort step construction method of traversing operation freeway tunnel of the present invention;
Fig. 2 a is downlink region tunnel excavation support of the present invention and two lining construction schematic diagrames;
Fig. 2 b is uplink region tunnel excavation support of the present invention and two lining construction schematic diagrames;
Fig. 3 is tunnel entrance tunnel of the present invention and speedway relation profile;
Fig. 4 is the present invention three step Temporary invert method profile.
Detailed description of the invention
Below in conjunction with accompanying drawing, to above-mentioned being described in more detail with other technical characteristic and advantage of the present invention.
Refer to shown in Fig. 1, it is the schematic flow sheet of the ultrashort step construction method of traversing operation freeway tunnel of the present invention, and this construction is first arrange firm guide support structure, then just has three benching tunnelling methods to construct.This detailed process is:
Step a, long pipe shed is constructed;
Step a1, the construction of guiding wall; Carry out face-upward slope excavation brush slope before the construction of guiding wall, the face-upward slope brush slope gradient is 1: 1, brushes the slope gradient and be adjusted to 1: 0.2 below the excavation line of top, hole.
Guiding wall thickness 1m, long 1.2m.Three Pin I20b i-beam frames established by guiding wall, weld guide pipe outside i iron, and guide pipe adopts Φ 200 steel pipe.Guiding wall adopts C25 concrete, arranges interior I20b bow member and does reinforcing support.Every Pin steelframe is 5 unit.
Excavation absolute altitude: 48cm below springing line.Bow member pin place builds a concrete foundation, wide 1m, dark 0.5m, longitudinally long 1.5m, and interior outside bow member spacing 10cm, is 5cm template, pads 5cm cushion block between template and bow member, adopts Φ 22 bar connecting, spacing 1m between steelframe.
Because below the excavation line of top, hole, to brush the slope gradient be 1: 0.2, the long 1.2m of guiding wall arch springing place guiding wall, vault center, the pre-buried termination of guide pipe is close to and is faced upward slope soil layer, and exposed parts carries out sealing and blocks, and prevents from being mixed into mud in steel pipe, otherwise can affect construction angle.The about long 3.5m of guide pipe.For ensureing stability of slope, guiding wall concrete also increases length, supports to side slope face.
Because section is comparatively large, inner side clay model is difficult to be shaped, and adopts steel pipe, the lumps of wood plays support, support and stand on firm ground between steelframe and Core Soil, or places plank etc. and play support again, and formwork reinforcement is firm.Steelframe and guide pipe install rear branching standing template, and guide pipe is embedding according to predetermined angular, and during for preventing concreting, bow member, guide pipe sink, 2 degree are strengthened than design angle during peace guide pipe processed, and the horizontal dipstick metering pair in each hole, face upward in top, oblique outside the left and right sides.Import is the curve of radius 1200m in addition, when left and right sides guide pipe is installed, adjusts curve impact.Formwork support arrangement has reinforced after-pouring concrete, observes steelframe and template stressing conditions, to control concreting speed during concreting.
Step a2, pipe roof construction;
Step a21, before pipe roof construction, first does preparation of construction, and after the completion of face guiding wall, unnecessary Core Soil is excavated, Core Soil slope suspended net shotcrete.
According to the actual geological condition in scene, the water drilling two kinds of modes adopting down-the-hole to beat air drill and tape guide test are carried out, Core Soil digs 80 centimeters under 1.5 meters of, first dig the ditch of 30 centimeters, 5 meters of length and width are dug in addition after the left and right sides, 1.2 ~ 1.5 meters of dark puddles, as the circulating water pool bored of fetching water.
Hardening of concrete used by guiding first 6 meters of wall.
Step a22, in pipe roof construction process, first processes pipe canopy; In the present embodiment, every root Φ 159 pipe canopy length is 51m, and be made up of plurality of sections of steel pipes, in order to meet design requirement, union will stagger mutually, often save length be 4,4.5,6m, wherein the first pipe joint canopy head is processed into taper, and length is 30cm; Connect between pipe canopy and adopt screwed connection, every pipe joint canopy two ends, interior screw thread is processed in one end, and male thread is processed in one end, and screw thread length is 15cm.The first long 30cm in pipe front end of pipe canopy cuts angle, and half is cut away in termination.Use wide 16cm again, long 40cm, thick 15mm steel plate full weld.
In pipe roof construction process, strictly executing brill by key points for operation, control rotating speed and progress well, noting the plateau of rig and the vertical stable state till now of drilling rod with creeping into simultaneously.Occur difference and shutdown inspection, in time to produce borehole throw corrected, prevent useless hole.
Connect between pipe canopy except employing screwed connection, also cut bar at outside steel pipe and carry out side weldering, the globality of steel pipe is provided.
Every Kong Jun carries out the inspection of whole hole, and the deviation of position, hole, the deviant of whole nose end are not more than 10cm, and mustn't invade excavation periphery, executes drill-through journey and carries out guiding test, heavily bores after filling for bending, shifted metering-orifice.The physical length that pipe canopy is squeezed into is not less than 90% of design length.
Step a23, reinforcing cage, filling concrete mortar in pipe is laid in processing;
Reinforcing cage is 4 Φ 18 reinforcing bars, and retainer ring adopts Φ 42 steel pipe to cut into ring, and length is 5cm, spacing 1.5m, and interval is arranged and is fixed, and front end adopts steel pipe to make tip, processes before mounting pipe canopy prerequisite.
After pipe boron steel pipe installs, reinforcing cage segmentation is pushed in pipe boron steel pipe.Junction adopts cover Φ 42 steel pipe to carry out reinforcement of weld.M20 cement mortar filled by pipe canopy, fills up rear sealing.
Step b, adopts double-deck supporting;
For guaranteeing tunnel safety and speedway operation security, tunnel adopts double-deck preliminary bracing, and outer employing I22 i iron, internal layer adopts I20b i iron, spacing 0.5m.
Step c, speedway is led and is changed;
Step c1, relieve traffic congestion speedway uplink, and Emergency Vehicle Lane and the normal lane of downlink are closed, and carry out descending line segment region tunnel excavation and lining cutting;
Step c2, relieve traffic congestion speedway downlink, carries out uplink region tunnel excavation support and two lining constructions;
Step c3, relieve traffic congestion speedway uplink, and Emergency Vehicle Lane and the normal lane of downlink are closed, and carries out downlink region tunnel excavation support and two lining constructions, in the middle of isolation strip of constructing.
Step c4, relieve traffic congestion speedway downlink, carries out uplink region tunnel excavation support and two lining constructions; All complete after two linings complete, recover speedway normal pass.
Steps d, adopts three step Temporary invert method constructions;
Steps d 1, excavation upper step;
Excavate 1. portion and upper step;
Apply the advance support of 1. portion and top barrel structure, preliminary bracing, frame founds steelframe, is drilled with system anchor bolt, sprayed mortar.Owing to being a double-deck just bow member, a two-layer just bow member need stagger 2 Pin, i.e. distance 1m.
Steps d 2, excavation middle bench;
Top bar after excavation 3 ~ 5m, excavate 2. portion and middle bench, spreading steelframe, apply preliminary bracing and the Temporary invert supporting of barrel structure, frame founds steelframe, is drilled with system anchor bolt, sprayed mortar.Owing to being a double-deck just bow member, a two-layer just bow member need stagger 2 Pin, i.e. distance 1m.
Steps d 3, excavation lower step;
Excavate 3. portion and lower step, apply preliminary bracing, frame founds steelframe, is drilled with system anchor bolt, sprayed mortar.Owing to being a double-deck just bow member, a two-layer just bow member need stagger 2 Pin, i.e. distance 1m.
Steps d 4, at the bottom of the tunnel of excavation bottom;
4. portion of excavating also is at the bottom of the tunnel of bottom, often circulation excavation drilling depth 3m, and apply preliminary bracing, ring is closed in preliminary bracing.
Steps d 5, inverted arch is constructed; This process is:
According to monitoring and measurement data analysis, apply inverted arch in time, ensure just Zhi Wending;
Perform inverted arch excavation, often circulation excavation drilling depth 3m;
Perform inverted arch two lining, every 6m construction once;
Perform inverted arch to fill, every 6m construction once;
Steps d 6, arch wall two serves as a contrast construction;
Can carry out lining cutting for reducing digging distance, design of tunnel lining trolley but is 9m by lining trolley not 12m design routinely, when construction 9 ~ 10m filled by inverted arch, and arch wall lining cutting of can constructing.
In this three steps Temporary invert method work progress, strictly control the distance between each substep; The construction quality of strict control advance support measure and quantity; Tunnel excavation is backbreak part, and full with the jetting cement spray of equal label, arch stops to occur cavity or leakiness phenomenon; Steelframe lock pin anchor tube and lock foot anchoring stock are 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 junction plate, fills steel plate or reinforcing bar carries out full weld; Top bar and middle step steelframe base pad establish feet channel-section steel, steelframe footing of getting out of a predicament or an embarrassing situation can pad establishes plank; Temporary invert steelframe installed by middle step, and is connected firmly with permanent steelframe.
Step e, the stressed automatic monitoring system of supporting and protection structure; Tunnel cross-section arranges monitoring device, by sensor group, data/address bus, automatically vasculum to the information of the displacement deformation in tunnel and soil pressure change and process, Real-Time Monitoring constructing tunnel situation.
Step f, closelying follow of secondary lining; According to surrounding rock tunnel monitoring measurement situation, tunnel bulk deformation tends towards stability, and progressively can remove temporary support, construction two lining concrete.
The foregoing is only preferred embodiment of the present invention, is only illustrative for invention, and nonrestrictive.Those skilled in the art is understood, and can carry out many changes in the spirit and scope that invention claim limits to it, amendment, even equivalence, but all will fall within the scope of protection of the present invention.

Claims (10)

1. the ultrashort step construction method of traversing operation freeway tunnel, it is characterized in that, this detailed process is:
Step a, long pipe shed is constructed; Respectively to guiding wall and pipe roof construction, carry out face-upward slope excavation brush slope before the construction of guiding wall, the face-upward slope brush slope gradient is 1: 1, brushes the slope gradient and be adjusted to 1: 0.2 below the excavation line of top, hole;
Step b, adopts double-deck supporting, and tunnel adopts double-deck preliminary bracing;
Step c, speedway is led and is changed;
Steps d, adopts three step Temporary invert method constructions, successively excavates upper step, middle bench, lower step and tunnel, bottom, and adopt inverted arch engineering method progressively to construct;
Step e, the stressed automatic monitoring system monitoring of supporting and protection structure; Tunnel cross-section arranges monitoring device, the information that displacement deformation and the soil pressure in tunnel are changed and process, Real-Time Monitoring constructing tunnel situation;
Step f, closelying follow of secondary lining; According to surrounding rock tunnel monitoring measurement situation, tunnel bulk deformation tends towards stability, and progressively can remove temporary support, construction two lining concrete.
2. the ultrashort step construction method of traversing operation freeway tunnel according to claim 1, is characterized in that, in above-mentioned steps d, Specific construction process is:
Steps d 1, excavation upper step; Excavation upper step, applies the advance support of top barrel structure, preliminary bracing;
Steps d 2, excavation middle bench; Top bar after excavation 3 ~ 5m, open middle bench, spreading steelframe, apply preliminary bracing and the Temporary invert supporting of barrel structure;
Steps d 3, excavation lower step; Excavation lower step, applies preliminary bracing;
Steps d 4, at the bottom of the tunnel of excavation bottom; At the bottom of the tunnel of excavation bottom, often circulation excavation drilling depth 3m, apply preliminary bracing, ring is closed in preliminary bracing;
Steps d 5, inverted arch is constructed;
Steps d 6, arch wall two serves as a contrast construction; Be 9m by design of tunnel lining trolley, when construction 9 ~ 10m filled by inverted arch, arch wall lining cutting of can constructing.
3. the ultrashort step construction method of traversing operation freeway tunnel according to claim 2, it is characterized in that, in above-mentioned steps d1 and d2, frame founds steelframe, is drilled with system anchor bolt, sprayed mortar.Owing to being a double-deck just bow member, a two-layer just bow member need stagger 2 Pin, i.e. distance 1m.
4. the ultrashort step construction method of traversing operation freeway tunnel according to claim 3, is characterized in that, in above-mentioned steps d5, the detailed process of inverted arch construction is: according to monitoring and measurement data analysis, apply inverted arch in time, ensures just Zhi Wending; Perform inverted arch excavation, often circulation excavation drilling depth 3m; Perform inverted arch two lining, every 6m construction once; Perform inverted arch to fill, every 6m construction once.
5. the ultrashort step construction method of traversing operation freeway tunnel according to claim 2, it is characterized in that, in above-mentioned steps a, guiding wall thickness 1m, long 1.2m, three Pin I20b i-beam frames established by guiding wall, guide pipe is welded outside i iron, guide pipe adopts φ 200 steel pipe, and guiding wall adopts C25 concrete, arranges interior I20b bow member and does reinforcing support.Every Pin steelframe is 5 unit; Excavation absolute altitude: 48cm below springing line, for 5cm bow member pin, place builds a concrete foundation, wide 1m, dark 0.5m, longitudinally long 1.5m, interior outside bow member spacing 10cm, and template, pads 5cm cushion block between template and bow member, adopt φ 22 bar connecting, spacing 1m between steelframe; Vault center, the pre-buried termination of guide pipe is close to and is faced upward slope soil layer.
6. the ultrashort step construction method of traversing operation freeway tunnel according to claim 2, is characterized in that, in above-mentioned steps a, during pipe roof construction,
Step a21, first does preparation of construction, and after the completion of face guiding wall, unnecessary Core Soil is excavated, Core Soil slope suspended net shotcrete; Step a22, in pipe roof construction process, first processes pipe canopy;
Step a23, reinforcing cage, filling concrete mortar in pipe is laid in processing; Reinforcing cage is 4 Φ 18 reinforcing bars, and retainer ring adopts Φ 42 steel pipe to cut into ring, and length is 5cm, spacing 1.5m, and interval is arranged and is fixed, and front end adopts steel pipe to make tip; After pipe boron steel pipe installs, reinforcing cage segmentation is pushed in pipe boron steel pipe; Junction adopts cover Φ 42 steel pipe to carry out reinforcement of weld, and M20 cement mortar filled by pipe canopy, fills up rear sealing.
7. the ultrashort step construction method of traversing operation freeway tunnel according to claim 6, it is characterized in that, in above-mentioned steps a22, every root Φ 159 pipe canopy length is 51m, be made up of plurality of sections of steel pipes, and mutually stagger, often save length be 4,4.5,6m, wherein the first pipe joint canopy head is processed into taper, and length is 30cm; Connect between pipe canopy and adopt screwed connection, every pipe joint canopy two ends, interior screw thread is processed in one end, and male thread is processed in one end, and screw thread length is 15cm; The first long 30cm in pipe front end of pipe canopy cuts angle, and half is cut away in termination; Use wide 16cm again, long 40cm, thick 15mm steel plate full weld.
8. the ultrashort step construction method of traversing operation freeway tunnel according to claim 2, is characterized in that, in above-mentioned steps c, its detailed process is:
Step c1, relieve traffic congestion speedway uplink, and Emergency Vehicle Lane and the normal lane of downlink are closed, and carry out descending line segment region tunnel excavation and lining cutting;
Step c2, relieve traffic congestion speedway downlink, carries out uplink region tunnel excavation support and two lining constructions;
Step c3, relieve traffic congestion speedway uplink, and Emergency Vehicle Lane and the normal lane of downlink are closed, and carries out downlink region tunnel excavation support and two lining constructions, in the middle of isolation strip of constructing;
Step c4, relieve traffic congestion speedway downlink, carries out uplink region tunnel excavation support and two lining constructions; All complete after two linings complete, recover speedway normal pass.
9. the ultrashort step construction method of traversing operation freeway tunnel according to claim 4, it is characterized in that, in this three steps Temporary invert method work progress, tunnel excavation is backbreak part, full with the jetting cement spray of equal label, arch stops to occur cavity or leakiness phenomenon; Lock pin anchor tube installs " L " type muscle and steelframe firm welding; Steelframe bolt ensures quantity, and tightens, and there is space to junction plate, fills steel plate or reinforcing bar carries out full weld; Top bar and middle step steelframe base pad establish feet channel-section steel, steelframe footing of getting out of a predicament or an embarrassing situation can pad establishes plank; Temporary invert steelframe installed by middle step, and is connected firmly with permanent steelframe.
10. the ultrashort step construction method of traversing operation freeway tunnel according to claim 4, is characterized in that, in above-mentioned steps a, adopt steel pipe between steelframe and Core Soil, the lumps of wood plays support, firm ground is stood in support, or places plank etc. and play support again, and formwork reinforcement is firm; Steelframe and guide pipe install rear branching standing template, and guide pipe is embedding according to predetermined angular, and during for preventing concreting, bow member, guide pipe sink, 2 degree are strengthened than design angle during peace guide pipe processed, and the horizontal dipstick metering pair in each hole, face upward in top, oblique outside the left and right sides.
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Cited By (8)

* Cited by examiner, † Cited by third party
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CN105781591A (en) * 2016-01-26 2016-07-20 中铁二十二局集团第工程有限公司 Pipe roof support structure
CN105909262A (en) * 2016-05-12 2016-08-31 中国五冶集团有限公司 Subsurface tunnel driving method
CN106555593A (en) * 2016-12-02 2017-04-05 中铁隧道集团有限公司 A kind of big cross section soft rock tunnel is got out of a predicament or an embarrassing situation the construction method of excavation synchronous with inverted arch
CN108643935A (en) * 2018-04-27 2018-10-12 中铁六局集团天津铁路建设有限公司 The construction method in tunnel under rich water shallow embedding geology
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CN108643935A (en) * 2018-04-27 2018-10-12 中铁六局集团天津铁路建设有限公司 The construction method in tunnel under rich water shallow embedding geology
CN109372522A (en) * 2018-11-27 2019-02-22 中铁隆工程集团有限公司 Urban track traffic complexity overlapping tunnel construction method
CN109611102A (en) * 2019-01-11 2019-04-12 北京市政路桥股份有限公司 Construction of the flyover method is worn under a kind of cold excavation
CN110593890A (en) * 2019-08-16 2019-12-20 同济大学 Tunnel corrugated steel double-layer primary lining supporting method and structure
CN110454189A (en) * 2019-08-22 2019-11-15 中铁隧道集团三处有限公司 A kind of river tunnel Xia Chuan construction technology

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