CN102102521A - Method for broadening and rebuilding soft soil shallow tunnel in operation state - Google Patents
Method for broadening and rebuilding soft soil shallow tunnel in operation state Download PDFInfo
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- CN102102521A CN102102521A CN 201010611495 CN201010611495A CN102102521A CN 102102521 A CN102102521 A CN 102102521A CN 201010611495 CN201010611495 CN 201010611495 CN 201010611495 A CN201010611495 A CN 201010611495A CN 102102521 A CN102102521 A CN 102102521A
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Abstract
The invention provides a method for broadening and rebuilding a soft soil shallow tunnel in an operation state, which comprises the following steps of: (1) arranging uplift piles, a foundation pit enclosure structure, a bridge pile foundation and the like on the outer side of the tunnel to be broadened; (2) digging the tunnel to be broadened, and performing construction on a bottom plate of the broadened part, a side wall and the like; (3) arranging bridge abutments on the bridge pile foundation; (4) detaching the structures such as partial side walls, top plates and the like of the original tunnel under the condition of protection; (5) arranging a cover beam between the bridge abutments; and (6) performing broadening waterproof treatment on the tunnel, and performing construction on an embedded bridge floor and the like. The broadening and rebuilding method of the invention is convenient for construction, has low cost, and can ensure normal traffic operation in the tunnel at the same time of construction.
Description
Technical field
The present invention relates to the realm of building construction, the weak soil shallow tunnel is widened the reconstruction method under particularly a kind of operation state.
Background technology
The widening of tunnel transformed usually the purpose for two kinds, and the one, be subjected to the restriction of the initial design traffic capacity, often the traffic capacity is less at first in some tunnels, and along with the increase of the magnitude of traffic flow, these tunnels begin to adapt to new demand; The 2nd, the function in tunnel changes, must be whole or local in addition widen transformation.But be subjected to condition restriction such as layout of urban functions, the distribution of present situation road network and traffic circulation requirement, often do not have new built tunnel possibility, must under the condition that guarantees the tunnel operation, finish the transformation of widening in tunnel, former address.
But in the project implementing process, all there is difficult point, is embodied in the following aspects in many-sides such as the balance of traffic support, the big load of top board, water counter-force balance, construction safety guarantees:
1) traffic support problem.The tunnel generally all is positioned at the heavy traffic section, in the whole transformation process, must finish the reconstruction of widening in tunnel under the prerequisite of uninterrupted traffic.
2) little span becomes the roof and floor transformation difficulty of longspan structure.Before transformation was widened in the tunnel, its top did not have other load, and widen transform finish after, not only span increases, the permanent live load of top board top all might increase, and amplitude of variation is bigger, how the unusual difficulty of this load of balance.
3) base plate water counter-force balance difficulty.After structural span increases, act on water counter-force total on the base plate also increase bigger, the unusual difficulty of equilibrium water counter-force under the tunnel operation condition how.
4) the safety requirements height of dismounting and newly-built structure.The dismounting of total and newly-built process, relate to dismounting, newly-built structure of excavation, precipitation, soil stabilization, the original structure of deep foundation ditch etc., operation is many and complicated, and each link must guarantee that the clear height of below operation tunnel and the safety of vehicle pass-through etc. are in slave mode all the time.
Summary of the invention
The purpose of this invention is to provide under a kind of operation state the weak soil shallow tunnel and widen the reconstruction method, to solve the problem that can't ensure traffic circulation when the tunnel is widened.
The present invention proposes under a kind of operation state the weak soil shallow tunnel and widens the reconstruction method, may further comprise the steps: (1) lays uplift pile, foundation pit enclosure structure, bridge pile foundation etc. in the outside that must widen the tunnel.(2) widen constructions such as the excavation of foundation ditch, the base plate of widening part, side wall.(3) on bridge pile foundation, lay abutment.(4) in structures such as the part side wall that the former tunnel of dismounting under the condition of protection is arranged, top boards.(5) between abutment, set up bent cap.(6) tunnel is widened the construction of secretly burying bridge deck etc. of waterproof and all the other parts.
Preferably, the weak soil shallow tunnel is widened the reconstruction method under the described operation state, also further comprises step before setting up bent cap: (1) must widen in the tunnel above make up protective stent.(2) remove structures such as the top must widen the tunnel, side wall.
Preferably, the weak soil shallow tunnel is widened the reconstruction method under the described operation state, also further comprises step after setting up bent cap: horizontal splash guard is set below bent cap.
Preferably, the weak soil shallow tunnel is widened the reconstruction method under the described operation state, also comprises step before laying bridge pile foundation: must widen the uplift pile of tunnel cross-section arranged outside.
Preferably, the weak soil shallow tunnel is widened the reconstruction method under the described operation state, bent cap is by prefabrication, and lifting is constructed at the scene.
Preferably, the weak soil shallow tunnel is widened the reconstruction method under the described operation state, and bent cap is T type freely-supported bent cap or prestressed concrete box girder or prestressed concrete plate beam or steel structure girder.
Preferably, the weak soil shallow tunnel is widened the reconstruction method under the described operation state, bent cap stride the footpath direction vertical with former tunnel direction of traffic.
The invention has the beneficial effects as follows:
1, the present invention secretly buries the cover plate bridge by means of laying in the tunnel, and not only easy construction more can be finished the transformation of widening in tunnel under the situation of not interrupting tunnel normal traffic operation.
2, the present invention bears the load of tunnel upper by the cover plate bridge that sets up, avoided becoming in the big process internal force influence that tunnel side wall and base plate are produced in span, thereby the tunnel clear height can not change yet, need not tunnel bottom is excavated, avoided interruption of communication, reduce construction cost, also shortened the duration.
3, the present invention is by in tunnel arranged outside uplift pile, active balance the water counter-force that is subjected to of tunnel.
4, the present invention is by being provided with splash guard on top, tunnel, effectively prevented the influence that underground water causes tunnel and constructing tunnel.
5, the present invention prevents in the former tunnel segment demolishing process by make up protective stent on top, tunnel, removes thing and falls in the tunnel, has ensured the safety of vehicle in the tunnel.
Description of drawings
Fig. 1 widens a kind of embodiment flow chart of reconstruction method for weak soil shallow tunnel under the operation state of the present invention;
Fig. 2 widens the another kind of embodiment flow chart of reconstruction method for weak soil shallow tunnel under the operation state of the present invention;
Fig. 3 carries out the embodiment schematic diagram widened in the tunnel for using the present invention.
The specific embodiment
Widen in the process in the tunnel, because its span has increased, the permanent live load (as vehicle weight, ground installation, tunnel roof deadweight etc.) that tunnel roof is born has also increased, thereby for this load of balance, make top board have higher supporting capacity, need to increase the thickness of top board usually.If Tunnel Design is a box section, top plate thickness increases more or less freely, but correspondingly the adjustment to base plate is very difficult.If top plate thickness increases in the tunnel, then will inevitably influence the current clear height in tunnel, need base plate also to extend downwards, promptly cutting on the basis of base arrangement, excavation so then must interrupt the traffic in tunnel downwards.
For overcoming this difficulty, the present invention proposes at tunnel upper and make up the thought of secretly burying horizontal cover plate bridge, as shown in Figure 1, it widens a kind of embodiment flow chart of reconstruction method for weak soil shallow tunnel under the operation state of the present invention, may further comprise the steps:
(1) lays uplift pile, foundation pit enclosure structure, bridge pile foundation etc. in the outside that must widen the tunnel.(2) widen constructions such as the excavation of foundation ditch, the base plate of widening part, side wall.(3) on bridge pile foundation, lay abutment.(4) in structures such as the part side wall that the former tunnel of dismounting under the condition of protection is arranged, top boards.(5) between abutment, set up lid (plate) beam.(6) tunnel is widened the construction of secretly burying bridge deck etc. of waterproof and all the other parts.
S101 lays uplift pile, foundation pit enclosure structure, bridge pile foundation etc. in the outside that must widen the tunnel.The scope that foundation pit enclosure structure energy outsourcing tunnel must be widened, and leave the certain device operating space, uplift pile should be pressed close to the side wall laying of former tunnel, and the pile foundation of bridge is greater than the distance that the tunnel is widened to the distance of former tunnel side wall.
S102 widens constructions such as the excavation of foundation ditch, the base plate of widening part, side wall.Excavation of foundation pit and structure are returned in the process of building, and take suitable interim strutting means, guarantee the safety of former tunnel structure;
S103 lays abutment on bridge pile foundation.
S104 is in structures such as the part side wall that the former tunnel of dismounting under the condition of protection is arranged, top boards.Can in the tunnel, set up light-duty safeguard structure,,, finish the dismounting of former tunnel roof and part sidewall structure by technology such as concrete cutting, Heavy Equipment-hoisting having under the condition of protection.
S105 sets up bent cap between abutment.Bent cap can adopt concrete pre-stress T type freely-supported bent cap or prestressed concrete box girder or steel structure girder etc., and bent cap can be by prefabrication, and lifting is constructed at the scene.
S106, the construction of secretly burying bridge deck of the tunnel being widened waterproof and all the other parts.This stage is mainly finished constructions such as the leveling layer that secretly buries bridge floor, waterproof, backfilling of earthwork.
Above-mentioned bent cap, abutment and pile foundation have promptly constituted of the present inventionly secretly buries the cover plate bridge, and described cover plate bridge to stride the footpath direction vertical with the direction of traffic in former tunnel.After the cover plate bridge was laid and to be finished, road surface pavement on bent cap just can the same traffick with general ground level road, the promptly so-called cover plate bridge that secretly buries.And ground garage load, structural load etc. are directly to be born by newly-built basis (being bent cap, abutment and pile foundation), have effectively avoided load to reach tunnel floor from the tunnel side wall, bear the structural change that excessive internal force causes and cause because of base plate.Therefore, the reconstruction method is widened in tunnel of the present invention, after having built the cover plate bridge, can the normal operation in former tunnel not impacted fully, need in widening process, not dig under the tunnel floor yet, and directly can former tunnel be widened to both sides, therefore do not need to interrupt the traffic in the tunnel.
See also Fig. 2, it is the another kind of embodiment flow chart that the weak soil shallow tunnel is widened the reconstruction method under the operation state of the present invention, and it may further comprise the steps:
S201 must widen the uplift pile of tunnel cross-section arranged outside, foundation pit enclosure structure, bridge pile foundation etc.
If being meant when the construction work underground structure, uplift pile has when being lower than the part of peripheral soil water level, the stake of beating in order to offset the buoyancy that water produces structure in the soil (or claiming water counter-force), and uplift pile is mainly next stressed by the frictional force of pile body and soil layer.Uplift pile of the present invention is mainly used to the water counter-force that is subjected in the balance constructing tunnel process.
Uplift pile is set in the tunnel, and the span centre (being the base plate centre position) that more satisfactory is in the tunnel is provided with pile foundation, can realize by the mode of piling under original tunnel floor, but must interrupt the traffic in tunnel like this.Therefore the present invention has selected the mode in former tunnel cross-section arranged outside compressive pile for use, though the suffered internal force of tunnel bottom has certain increase, but in tolerance band, and uplift pile is arranged on the operation that the former tunnel cross-section outside can reduce to influence because of pile foundation construction former tunnel.
S202 widens the excavation of foundation ditch and structure and returns and build.
Excavation of foundation pit is built in the process with returning, and should take measures such as suitable soil stabilization, interim supports, controls the distortion, displacement of original structure etc., guarantees the safety of original structure.
S203 lays abutment on bridge pile foundation.
S204, must widen in the tunnel above make up protective stent.
Because social traffic is very busy in the tunnel, the magnitude of traffic flow is very big, thereby for guaranteeing the current safety of below vehicle, the present invention adopts the mode that makes up protective stent in the tunnel above the vehicle pass-through, can guarantee to widen in the process and the safety of top board when removing construction.
S205, dismounting must be widened top, the sidewall structure in tunnel.
S206 is provided with horizontal splash guard at tunnel top.
S207 sets up bent cap between abutment.
Waterproof between cover plate bridge bridge deck structure and tunnel, below is one of link of considering of the present invention, thereby can cut off the connecting path in underground water and tunnel secretly burying below the horizontal bent cap and building horizontal splash guard between the tunnel.
S208 widens the tunnel.
Specify the present invention with a case history below, see also Fig. 3, it carries out the embodiment schematic diagram widened in the tunnel for using the present invention.This tunnel is two-tube two-way Four-Lane Road urban road tunnel, is divided into southern line and northern line.Now the tunnel will be widened to both sides, in figure, extend in promptly southern alignment left side, and extend on northern alignment right side.
In the present embodiment, made up two at tunnel upper and striden the horizontal cover plate bridge of simply supported beam, the cover plate bridge to stride footpath direction and former tunnel direction of traffic approaching vertical.The cover plate bridge is made of pile foundation 31, abutment 32 and bent cap 33, and pile foundation 31 can adopt bored pile, and it is laid in both sides, tunnel and centre, and the pile foundation 31 of both sides is greater than the distance that the tunnel is widened to the distance of side wall.Each pile foundation 31 top all is provided with abutment 32, is used for bearing upper load.The bent cap 33 of present embodiment is to be made up of two concrete pre-stress T type freely-supported bent caps, and sets up a T type freely-supported bent cap between two abutments 32.Get final product road surface pavement on the bent cap 33, thereby ground garage of garage load, structural load etc. are born by bent cap 33, abutment 32 and pile foundation 31 directly, can the construction in tunnel not impacted.
Below bent cap 33, the top in tunnel is built the splash guard 34 of one deck steel concrete respectively and has been built one deck protective stent 35.Splash guard 34 is used for cutting off and phreatic the contact.When protective stent 35 is used for preventing that former tunnel roof and part side wall from removing, removes thing and can not drop in the tunnel, ensured the safety of vehicle in the tunnel, and the normal traffic operation in tunnel.
In addition, influenced by the water counter-force, uplift pile 36 is arranged in former tunnel cross-section arranged outside for avoiding the tunnel.The uplift pile 36 of present embodiment lays respectively at the right side of Nan Xiansuidao and the left side of Bei Xiansuidao, and uplift pile 36 can not be subjected to the influence that the tunnel is widened laterally in work progress like this, and the water counter-force that is subjected to of balance tunnel effectively.
The present invention secretly buries the cover plate bridge by laying in the tunnel, not only easy construction more can be finished the widening project in tunnel under the situation of not interrupting tunnel normal traffic operation.More than disclosed only be several specific embodiment of the present invention, but the present invention is not limited thereto, any those skilled in the art can think variation, all should drop in protection scope of the present invention.
Claims (6)
1. the weak soil shallow tunnel is widened the reconstruction method under the operation state, it is characterized in that, may further comprise the steps:
Lay uplift pile, foundation pit enclosure structure, bridge pile foundation in the outside that must widen the tunnel;
Widen the excavation of foundation ditch, the base plate of widening part, side wall construction;
On bridge pile foundation, lay abutment;
Part side wall, the top board structure of removing former tunnel under the condition of protection arranged;
Between abutment, set up bent cap;
The tunnel is widened waterproof and secretly buried the bridge floor construction.
2. the weak soil shallow tunnel is widened the reconstruction method under the operation state as claimed in claim 1, it is characterized in that, in the uplift pile of the arranged outside permanent structure in former tunnel.
3. the weak soil shallow tunnel is widened the reconstruction method under the operation state as claimed in claim 1, it is characterized in that, also further comprises step before setting up bent cap:
Horizontal splash guard is set below bent cap.
4. the weak soil shallow tunnel is widened the reconstruction method under the operation state as claimed in claim 1, it is characterized in that, described bent cap is by prefabrication, and lifting is constructed at the scene.
5. the weak soil shallow tunnel is widened the reconstruction method under the operation state as claimed in claim 1, it is characterized in that, described bent cap is T type freely-supported bent cap or prestressed concrete box girder or steel structure girder.
6. the weak soil shallow tunnel is widened the reconstruction method under the operation state as claimed in claim 1, it is characterized in that, described bent cap stride the footpath direction vertical with the direction of traffic in former tunnel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010106114953A CN102102521B (en) | 2010-12-29 | 2010-12-29 | Method for broadening and rebuilding soft soil shallow tunnel in operation state |
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| CN2010106114953A CN102102521B (en) | 2010-12-29 | 2010-12-29 | Method for broadening and rebuilding soft soil shallow tunnel in operation state |
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| CN102102521A true CN102102521A (en) | 2011-06-22 |
| CN102102521B CN102102521B (en) | 2012-11-28 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104164839A (en) * | 2014-07-31 | 2014-11-26 | 天津市市政工程设计研究院 | Construction method for broadening box culvert |
| CN105952464A (en) * | 2016-05-27 | 2016-09-21 | 宁波市交通规划设计研究院有限公司 | A mountain tunnel reconstruction expanding excavation construction method |
| CN107542474A (en) * | 2017-09-18 | 2018-01-05 | 中铁广州工程局集团有限公司 | Tunnel oversized widened section surface controlled blasting excavation construction method |
| CN111946396A (en) * | 2020-08-03 | 2020-11-17 | 中交第三航务工程局有限公司 | Innovative tunnel dismantling process |
| CN111996899A (en) * | 2020-08-04 | 2020-11-27 | 上海市城市建设设计研究总院（集团）有限公司 | Method for building large-span channel in artificial landscape mountain |
| CN114150594A (en) * | 2021-12-07 | 2022-03-08 | 沈阳铁道勘察设计院有限公司 | Construction method for transforming existing service platform wall by adopting assembled wallboard |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104164839A (en) * | 2014-07-31 | 2014-11-26 | 天津市市政工程设计研究院 | Construction method for broadening box culvert |
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| CN105952464A (en) * | 2016-05-27 | 2016-09-21 | 宁波市交通规划设计研究院有限公司 | A mountain tunnel reconstruction expanding excavation construction method |
| CN105952464B (en) * | 2016-05-27 | 2018-07-06 | 宁波市交通规划设计研究院有限公司 | A kind of massif tunnel reconstruction Enlargement excavation method |
| CN107542474A (en) * | 2017-09-18 | 2018-01-05 | 中铁广州工程局集团有限公司 | Tunnel oversized widened section surface controlled blasting excavation construction method |
| CN107542474B (en) * | 2017-09-18 | 2019-04-23 | 中铁广州工程局集团有限公司 | Tunnel oversized widened section surface controlled blasting excavation construction method |
| CN111946396A (en) * | 2020-08-03 | 2020-11-17 | 中交第三航务工程局有限公司 | Innovative tunnel dismantling process |
| CN111946396B (en) * | 2020-08-03 | 2022-04-29 | 中交第三航务工程局有限公司 | Innovative tunnel dismantling process |
| CN111996899A (en) * | 2020-08-04 | 2020-11-27 | 上海市城市建设设计研究总院（集团）有限公司 | Method for building large-span channel in artificial landscape mountain |
| CN111996899B (en) * | 2020-08-04 | 2021-10-22 | 上海市城市建设设计研究总院（集团）有限公司 | Method for building large-span channel in artificial landscape mountain |
| CN114150594A (en) * | 2021-12-07 | 2022-03-08 | 沈阳铁道勘察设计院有限公司 | Construction method for transforming existing service platform wall by adopting assembled wallboard |
| CN114150594B (en) * | 2021-12-07 | 2022-11-22 | 沈阳铁道勘察设计院有限公司 | Construction method for transforming existing service platform wall by adopting assembled wallboard |
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