CN101598026A - Wear the preliminary bracing structure of speedway loess stratum large section tunnel under the shallow embedding - Google Patents
Wear the preliminary bracing structure of speedway loess stratum large section tunnel under the shallow embedding Download PDFInfo
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- CN101598026A CN101598026A CNA2009100598156A CN200910059815A CN101598026A CN 101598026 A CN101598026 A CN 101598026A CN A2009100598156 A CNA2009100598156 A CN A2009100598156A CN 200910059815 A CN200910059815 A CN 200910059815A CN 101598026 A CN101598026 A CN 101598026A
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Abstract
The invention discloses the preliminary bracing structure of wearing speedway loess stratum large section tunnel under a kind of shallow embedding, be intended to control effectively the sedimentation and the highway ground settlement of constructing tunnel.It comprises advance support structure and preliminary bracing structure, described advance support structure is outer bassoon canopy (11), the compound formation of being laid by spaced radial of interior bassoon canopy (12), and outer bassoon canopy (11), interior bassoon canopy (12) are arranged circumferentially scope and all extend to abutment wall maximum span position; Described preliminary bracing structure is outer sheath (21), the compound formation of interior sheath (22) that is formed by the loopful sprayed mortar.The invention has the beneficial effects as follows, can reduce the influence of excavation deformation effectively to the face of land, the preliminary bracing rigidity of tunnel outer lining and the ability of resistance to deformation have been strengthened, solved the technical barrier of loess tunnel construction effectively, can be with in the sedimentation value of constructing tunnel and the ground settlement value control 5cm, thus guarantee the safety of constructing tunnel and highway operation.
Description
Technical field
The present invention relates to the high-speed railway tunnel, particularly wear the preliminary bracing structure of speedway loess stratum large section tunnel under the shallow embedding.
Background technology
Zhengzhou to Xi'an special line for passenger trains, total track length 458.8km is that China is article one special line for passenger trains of 350km/h in the newly-built overall trip speed in loess area.The tunnel amounts to 38 completely, always is about 77km, wherein loess tunnel length overall 50km.Lay non-fragment orbit in this Line for Passenger Transportation tunnel, require line in tunnel that the ride comfort of height is arranged, settlement after construction requires to be not more than 15mm, relative settlement between the different structure thing should be greater than 5mm, settlement Control standard height, must adopt effective liner structure, avoid because substrate is subjected to produce bigger settlement after construction after the disturbance during the operation.Under the tunnel, wear under the situation of speedway, more will control the sedimentation value and the highway ground settlement value of constructing tunnel effectively, guaranteeing to wear under the tunnel safety of speedway, and construction costs is controlled in the reasonable range by preliminary bracing structure.
Traditional preliminary bracing structure be with individual layer bassoon canopy (Φ 108mm) as the advance support deck,, establish the loopful profile steel frame in the outer lining and add strong supporting as outer lining (C25 concrete, thick 35cm) with the loopful sprayed mortar, the steelframe spacing is generally 0.5m one Pin.Its weak point is that the sedimentation value of shallow embedding loess tunnel construction is big, the difficult control of ground settlement.With tunnel, the special line for passenger trains Hanguguan Pass, Zhengzhou to Xi'an is example, and this tunnel entrance is worn segment length 89m down with the speedway suddenly of the company of wearing under 30 ° of angles; Geology is the new loess of Q3, the about 30m of edpth of tunnel; The about 15m of tunnel excavation span, excavation area 170m
2The tunnel adopts the construction of CRD method, and the ductule advance support is adopted in the arch.According to 9 the settlement monitoring profile datas in road surface as can be known, each section maximum settlement is 138～529mm.Surface deformation is bigger, and many cracks occurred, to the safe operation formation influence of speedway.
Summary of the invention
Technical problem to be solved by this invention provides the preliminary bracing structure of wearing speedway loess stratum large section tunnel under a kind of shallow embedding, can control the sedimentation and the highway ground settlement of constructing tunnel effectively, to guarantee the safety of constructing tunnel and highway operation.
The technical solution adopted for the present invention to solve the technical problems is: the preliminary bracing structure of wearing speedway loess stratum large section tunnel under the shallow embedding of the present invention, comprise advance support structure and preliminary bracing structure, it is characterized in that: described advance support structure is the outer bassoon canopy of layer laid by spaced radial, internal layer bassoon canopy is compound constitutes, and outer bassoon canopy, internal layer bassoon canopy are arranged circumferentially scope and all extend to abutment wall maximum span position; To be that outer sheath being formed by the loopful sprayed mortar, interior sheath are compound constitute described preliminary bracing structure.
The invention has the beneficial effects as follows, adopt double-deck bassoon canopy advance support can increase pipe canopy rigidity, reduce to manage the canopy spacing, avoid that the soil body peels off between pipe, reduce the influence of excavation deformation effectively the face of land; The tunnel outer lining is to constitute by inside and outside sheath is compound, has strengthened the ability of preliminary bracing rigidity and resistance to deformation; Solve the technical barrier of loess tunnel construction effectively, the sedimentation value and the ground settlement value of constructing tunnel can have been controlled in the 5cm, can guarantee the safety of constructing tunnel and highway operation.
Description of drawings
This manual comprises as next width of cloth accompanying drawing:
Fig. 1 is a section structure schematic diagram of wearing highway large-section loess tunnel preliminary bracing structure under the present invention.
Member shown in the figure, toponym and pairing mark: outer bassoon canopy 11, interior bassoon canopy 12, prop up sheath 21, lock foot anchoring stock 21a, interior sheath 22 outward.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
With reference to Fig. 1, wear the preliminary bracing structure of speedway loess stratum large section tunnel under the shallow embedding of the present invention, comprise advance support structure and preliminary bracing structure.To be that the outer bassoon canopy of being laid by spaced radial 11, interior bassoon canopy 12 are compound constitute described advance support structure, and outer bassoon canopy 11, interior bassoon canopy 12 are arranged circumferentially scope and all extend to abutment wall maximum span position.Adopt double-deck bassoon canopy advance support can increase pipe canopy rigidity, reduce to manage the canopy spacing, avoid that the soil body peels off between pipe, reduce the influence of excavation deformation effectively the face of land.To be that outer sheath 21 being formed by the loopful sprayed mortar, interior sheath 22 are compound constitute described preliminary bracing structure.The outer lining of two-layer compound has strengthened the rigidity of tunnel preliminary bracing and the ability of resistance to deformation, in the sedimentation value and ground settlement value control 5cm with constructing tunnel, guarantees the safety of constructing tunnel and speedway operation effectively.
Be the distortion of controlling the loess country rock effectively and the stability that strengthens preliminary bracing, a described outer sheath 21 interior longitudinal separations are provided with the loopful steelframe and add strong supporting, and hoop is provided with vertical connecting reinforcement at interval between adjacent two Pin steelframes; Outer sheath 21 be at the arch springing portion lateral widening of its arch section, and lock foot anchoring stock 21a is set the loopful steelframe is anchored on the loess country rock.Because the arch springing portion of widening has increased the arch springing lifting surface area, being provided with of loopful steelframe, lock foot anchoring stock 21a improved the arch springing bearing capacity, therefore can more effectively control the arch preliminary bracing and sink.A described interior sheath 22 interior longitudinal separations are provided with loopful grid steelframe and add strong supporting, and hoop is provided with vertical connecting reinforcement at interval between adjacent two loopful grid steelframes.An outer sheath 21, interior sheath 22 can adopt the C25 concrete usually, and thickness is respectively 35cm, 25cm.
Be that embodiment further specifies the present invention with Line for Passenger Transportation Wenxiang tunnel, Zhengzhou to Xi'an below.
Wenxiang tunnel total length 770m is positioned at Lingbao City, Henan Province, is the difficult point engineering of Zhengzhou to Xi'an Line for Passenger Transportation, for two-wire is striden shallow embedding chiltern loess tunnel greatly.The tunnel is with the speedway suddenly of the company of wearing under 15 ° the low-angle, under the section of wearing tunnel excavation area 175m2 (excavation span 17.6m, height 13.6m), wearing length reaches 270m down, under the section of wearing divide two parts: wherein the 160m location is passed under highway, and the buried depth of this section only has about 10m; All the other two sections are passed below the highway cutting side slope, amount to 110m, and buried depth is 10～24m.
Wenxiang tunnel loess composition is based on powder, and quality is even, short texture, and void ratio is big, the macrovoid that the tool naked eyes are visible, the tool high-compressibility is met water easy disintegrating or saturated yielding.The following difficult point of this Tunnel Design construction tool:
(1) the maximum buried depth in tunnel is 24m, and the following company of wearing highway section suddenly has only 10m, and buried depth is shallow, covers to stride than being far smaller than 1, and the construction in tunnel is very big to the influence on road surface, top, and settlement Control is difficulty very.(2) the plane angle of cut of speedway only is 15 ° to tunnel axis with connecting suddenly, wears the segment length under this makes and reaches 270m, and constructing tunnel will be in current company for a long time to carry out the speedway below suddenly, very long to the influence time of speedway.(3) residing stratum, tunnel is a Q3 chiltern loess, and soil property is loose, and soil body stability is poor, and the tunnel excavation section is very big, and it is extremely difficult to construct.(4) connect suddenly that speedway has a large amount of heavy-load automobiles current,, constructing tunnel is had certain influence, make roadbed subsidence control difficulty more because buried depth is shallow.(5) because tunnel and Double to construction, enters runway simultaneously, highway again can not interrupt run, and construction safety risk is very big.
Wenxiang tunnel preliminary bracing structure and concrete parameter are as follows:
1. the advance support structure that is made of outer bassoon canopy 11, interior bassoon canopy 12 is established in the arch.Steel pipe caliber Φ 159, wall thickness is 8mm, and vertically effectively lap length is 10m.The bassoon canopy is arranged circumferentially scope and all extends to abutment wall maximum span position, and the outer limb of pipe canopy is controlled in 1 ° of scope, can carry out set of tunneling construction after every endless tube canopy construction is finished.
2. prop up in the sheath 21 longitudinal separations outward and the loopful steelframe is set adds strong supporting, steelframe spacing 0.5m one Pin, hoop is provided with Φ 22 vertical connecting reinforcements, connecting reinforcement circumferential distance 1.0m at interval between adjacent two Pin steelframes.At the lateral widening 80cm of arch springing portion of its arch section, and lock foot anchoring stock 21a is set the loopful steelframe is anchored on the loess country rock.Big arch springing place, every Pin loopful steelframe both sides establishes 4 Φ, 42 lock foot anchoring stock 21a, and every long 4.0m of lock foot anchoring stock 21a establishes Φ 8 steel mesh reinforcements in the arch wall.An outer sheath 21 adopts the C25 concrete, and thickness is 35cm.
3. an interior sheath 22 interior longitudinal separations are provided with loopful grid steelframe and add strong supporting, grid steelframe spacing 1.0m one Pin, and hoop is provided with Φ 22 vertical connecting reinforcements, connecting reinforcement circumferential distance 1.0m at interval between adjacent two grid steelframes.An interior sheath 22 adopts the C25 concretes, and thickness is 25cm.
Wear in the work progress under the Wenxiang tunnel, the express highway pavement maximum settlement only is 4.5cm, highway pavement does not produce the crack, has both guaranteed the construction safety of time wearing the tunnel to have guaranteed to connect the operation security of speedway suddenly again.Solve the technical barrier of loess tunnel construction effectively, and obtained remarkable economic results in society, had broad prospect for its application.
Wear some principles of the preliminary bracing structure of speedway loess stratum large section tunnel under the above shallow embedding of the present invention that just explains through diagrams, be not be the present invention to be confined to shown in and in described concrete structure and the scope of application, so every the corresponding modify and equivalent that might be utilized, the claim that all belongs to the present invention and applied for.
Claims (6)
1. wear the preliminary bracing structure of speedway loess stratum large section tunnel under the shallow embedding, comprise advance support structure and preliminary bracing structure, it is characterized in that: described advance support structure is outer bassoon canopy (11), the compound formation of being laid by spaced radial of interior bassoon canopy (12), and outer bassoon canopy (11), interior bassoon canopy (12) are arranged circumferentially scope and all extend to abutment wall maximum span position; Described preliminary bracing structure is outer sheath (21), the compound formation of interior sheath (22) that is formed by the loopful sprayed mortar.
2. wear the preliminary bracing structure of speedway loess stratum large section tunnel according to claim 1 under the shallow embedding, it is characterized in that: a described outer interior longitudinal separation of sheath (21) is provided with the loopful steelframe and adds strong supporting, and hoop is provided with vertical connecting reinforcement at interval between adjacent two Pin steelframes.
3. as wearing the preliminary bracing structure of speedway loess stratum large section tunnel under the shallow embedding as described in the claim 2, it is characterized in that: described outer sheath (21) be at the arch springing portion lateral widening of its arch section, and lock foot anchoring stock (21a) is set the loopful steelframe is anchored on the loess country rock.
4. as wearing the preliminary bracing structure of speedway loess stratum large section tunnel under the shallow embedding as described in claim 2 or 3, it is characterized in that: a described outer sheath (21) adopts the C25 concrete, and thickness is 35cm.
5. wear the preliminary bracing structure of speedway loess stratum large section tunnel according to claim 1 under the shallow embedding, it is characterized in that: a described interior interior longitudinal separation of sheath (22) is provided with loopful grid steelframe and adds strong supporting, and hoop is provided with vertical connecting reinforcement at interval between adjacent two loopful grid steelframes.
6. as wearing the preliminary bracing structure of speedway loess stratum large section tunnel under the shallow embedding as described in the claim 5, it is characterized in that: a sheath (22) adopts the C25 concrete in described, and thickness is 25cm.
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| CNA2009100598156A CN101598026A (en) | 2009-06-29 | 2009-06-29 | Wear the preliminary bracing structure of speedway loess stratum large section tunnel under the shallow embedding |
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| CNA2009100598156A CN101598026A (en) | 2009-06-29 | 2009-06-29 | Wear the preliminary bracing structure of speedway loess stratum large section tunnel under the shallow embedding |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102606167A (en) * | 2012-03-16 | 2012-07-25 | 西安理工大学 | Settlement control construction method for transverse grouting guide pipe of shallow underground excavation tunnel |
| CN103147770A (en) * | 2013-03-24 | 2013-06-12 | 中铁二院工程集团有限责任公司 | Large-span heavy load stress induction type backfilling open cut tunnel lining structure |
| CN104533446A (en) * | 2015-01-16 | 2015-04-22 | 中交一公局第一工程有限公司 | Construction method and structure of two-layer preliminary support for preventing geological disaster of large-section weak surrounding rock tunnel |
| CN105863681A (en) * | 2016-06-27 | 2016-08-17 | 西北大学 | Quick protecting method for sloughing and sand sliding of roof of excavated sandy loess tunnel |
| CN105971611A (en) * | 2016-05-25 | 2016-09-28 | 中车建设工程有限公司 | Roadbed settlement control method for subway tunnel passing under existing trunk railway closely |
| CN107036580A (en) * | 2017-04-15 | 2017-08-11 | 中铁二院工程集团有限责任公司 | A kind of simple subgrade settlement automated watch-keeping facility and monitoring method |
| CN109667603A (en) * | 2018-12-28 | 2019-04-23 | 中铁第四勘察设计院集团有限公司 | A kind of super shallow-buried tunnel structure and construction method |
| CN110159308A (en) * | 2019-05-27 | 2019-08-23 | 中国五冶集团有限公司 | A kind of tunnel long pipe shed localization method |
| CN111293659A (en) * | 2020-03-19 | 2020-06-16 | 广州市第二市政工程有限公司 | Construction method of assembled shallow-buried rolling-resistant sleeve and passing pipeline |
| CN111998825A (en) * | 2020-08-17 | 2020-11-27 | 中铁十九局集团第二工程有限公司 | Monitoring and measuring method for shallow buried section of tunnel |
| CN112228117A (en) * | 2020-10-28 | 2021-01-15 | 中铁十二局集团有限公司 | Construction method for large-section primary support large arch springing |
| CN112302662A (en) * | 2020-10-29 | 2021-02-02 | 中铁上海工程局集团有限公司 | Construction method of artificial backfill shallow-buried tunnel passing through highway |
| CN114483055A (en) * | 2022-03-31 | 2022-05-13 | 中国电建市政建设集团有限公司 | Construction method for super-large span ultra-shallow buried high-speed rail tunnel to pass through pond tunnel section |
-
2009
- 2009-06-29 CN CNA2009100598156A patent/CN101598026A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102606167A (en) * | 2012-03-16 | 2012-07-25 | 西安理工大学 | Settlement control construction method for transverse grouting guide pipe of shallow underground excavation tunnel |
| CN102606167B (en) * | 2012-03-16 | 2014-03-12 | 西安理工大学 | Settlement control construction method for transverse grouting guide pipe of shallow underground excavation tunnel |
| CN103147770A (en) * | 2013-03-24 | 2013-06-12 | 中铁二院工程集团有限责任公司 | Large-span heavy load stress induction type backfilling open cut tunnel lining structure |
| CN103147770B (en) * | 2013-03-24 | 2016-09-21 | 中铁二院工程集团有限责任公司 | Large-span heavy-load stress induced backfill open cut tunnel liner structure |
| CN104533446A (en) * | 2015-01-16 | 2015-04-22 | 中交一公局第一工程有限公司 | Construction method and structure of two-layer preliminary support for preventing geological disaster of large-section weak surrounding rock tunnel |
| CN104533446B (en) * | 2015-01-16 | 2017-06-06 | 中交一公局第一工程有限公司 | Construction method and its structure that a kind of big cross section Support System in Soft Rock Tunnels bilayer pre- Geological disaster prevention of preliminary bracing occurs |
| CN105971611A (en) * | 2016-05-25 | 2016-09-28 | 中车建设工程有限公司 | Roadbed settlement control method for subway tunnel passing under existing trunk railway closely |
| CN105863681A (en) * | 2016-06-27 | 2016-08-17 | 西北大学 | Quick protecting method for sloughing and sand sliding of roof of excavated sandy loess tunnel |
| CN107036580A (en) * | 2017-04-15 | 2017-08-11 | 中铁二院工程集团有限责任公司 | A kind of simple subgrade settlement automated watch-keeping facility and monitoring method |
| CN109667603A (en) * | 2018-12-28 | 2019-04-23 | 中铁第四勘察设计院集团有限公司 | A kind of super shallow-buried tunnel structure and construction method |
| CN110159308A (en) * | 2019-05-27 | 2019-08-23 | 中国五冶集团有限公司 | A kind of tunnel long pipe shed localization method |
| CN110159308B (en) * | 2019-05-27 | 2022-03-15 | 中国五冶集团有限公司 | Method for positioning long pipe shed of tunnel |
| CN111293659A (en) * | 2020-03-19 | 2020-06-16 | 广州市第二市政工程有限公司 | Construction method of assembled shallow-buried rolling-resistant sleeve and passing pipeline |
| CN111293659B (en) * | 2020-03-19 | 2021-03-23 | 广州市第二市政工程有限公司 | Construction method of passing pipeline of assembled shallow-buried rolling-resistant sleeve |
| CN111998825A (en) * | 2020-08-17 | 2020-11-27 | 中铁十九局集团第二工程有限公司 | Monitoring and measuring method for shallow buried section of tunnel |
| CN112228117A (en) * | 2020-10-28 | 2021-01-15 | 中铁十二局集团有限公司 | Construction method for large-section primary support large arch springing |
| CN112302662A (en) * | 2020-10-29 | 2021-02-02 | 中铁上海工程局集团有限公司 | Construction method of artificial backfill shallow-buried tunnel passing through highway |
| CN114483055A (en) * | 2022-03-31 | 2022-05-13 | 中国电建市政建设集团有限公司 | Construction method for super-large span ultra-shallow buried high-speed rail tunnel to pass through pond tunnel section |
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Open date: 20091209 |