CN102121385B - Tunnel excavation method for extending existing single-hole tunnel into double-arch tunnel - Google Patents
Tunnel excavation method for extending existing single-hole tunnel into double-arch tunnel Download PDFInfo
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- CN102121385B CN102121385B CN 201110066010 CN201110066010A CN102121385B CN 102121385 B CN102121385 B CN 102121385B CN 201110066010 CN201110066010 CN 201110066010 CN 201110066010 A CN201110066010 A CN 201110066010A CN 102121385 B CN102121385 B CN 102121385B
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Abstract
The invention belongs to the field of tunnel engineering, and particularly relates to a tunnel excavation method for extending the existing single-hole tunnel into a double-arch tunnel. The method comprises the following steps of: constructing mid-boards on a plurality of cross sections in the existing tunnel; after the mid-boards are constructed, filling a cavity on one side of the existing tunnel; excavating a side wall guide hole of a newly-constructed tunnel on the other side of the existing tunnel; excavating a middle soil body; after the second lining of the side tunnel is constructed, excavating a cavity on the other side; excavating a guide hole on the other side while excavating filling in the existing tunnel; after excavation, removing a lining and constructing the second lining; and excavating two caverns at a certain interval, wherein the interval is determined according to the diameter of a single hole of the double-arch tunnel. A newly-constructed cavern is excavated by excavating the side wall guide hole, constructing a temporary support, excavating the middle soil body, removing the temporary support and constructing the second lining of the tunnel in turn. Before the newly-constructed cavern is excavated, the other side of the existing tunnel opposite to the cavern to be excavated is filled, and a filled part is removed during excavation of the side cavern. Due to the consideration of the disturbance of excavation on enclosing rock, the excavation time and the space effect and under the assistance of a pre-supporting measure, the excavation method is suitable for extending tunnels under poor geological conditions such as soft soil layers, fracture zones and the like. The excavation method has the advantages of easiness and convenience in implementing and small quantity of procedures, the disturbance of enclosing rock can be reduced, and the construction period is reduced.
Description
Technical field
The invention belongs to the construction of tunnel field, being specifically related to a kind of existing single-hole tunnel enlarging is the tunnel excavation method in duplex arch tunnel.
Background technology
At present, build in single hole tunnel of last century 70, the eighties and face " expand can " problem in a large number, to satisfy transport need.Main mode that the tunnel " expands ability " is original place reconstruction, enlarging existing tunnel; The former hole of general employing enlarges; This method can cause tunnel space under-utilized (not changing under the situation of tunnel-shaped) or the flat tunnel of large span occur, and the enlarging of single hole does not solve problems such as two-way traffic interference.The traffic that can reduce of encircleing the tunnel based on single hole tunnel enlarging duplex disturbs expansion ability ability stronger, but its work progress country rock main stress bar changes complicacy, and reasonably sequence of construction and supporting measure influence bigger to country rock disturbance, tunnel deformation etc.
Single hole tunnel enlarging is disturbed for duplex arch tunnel can reduce counter flow, optimize traffic environment, but its construction difficulty is relatively large.Single hole tunnel enlarging has executing the mode of work, road alignment coupling and saving construction period of mid-board for duplex arch tunnel subject matter.The existing tunnel enlarging can be adopted three kinds of modes for the form of construction work of the mid-board in duplex arch tunnel; A kind of is that cavitation is executed pilot tunnel in the work near existing tunnel; The mid-board of constructing then; This mode can multibreak excavation construction mid-board, but need adjust the linear of original tunnel, brings changes such as inlet and outlet cave is linear, elevation bigger; Make mid-board for existing tunnel enlarged to execute in a side then for second kind, this method excavation has increased the span of single hole tunnel excavation, is being prone to cause problem such as country rock instability; The third mode is made mid-board in existing tunnel, executing, and expands then and digs left and right sides bore tunnel.
Summary of the invention
The object of the present invention is to provide a kind of existing single-hole tunnel enlarging is the tunnel excavation method in duplex arch tunnel, is employed in multibreak surface construction mid-board in the existing tunnel, excavates the excavation method of the existing tunnel enlarging of left and right sides pilot tunnel for duplex arch tunnel then.This method divides section to execute in existing tunnel to make mid-board, and mid-board top to tunnel top adopts slip casting to fill processing, in the one-sided tunnel of excavation, excavates the opposite side tunnel at last then.Concentrate for reducing surrouding rock stress in the tunnel excavation process, can take to banket, mode balance soil pressure such as symmetry excavation.
A kind of existing single-hole tunnel enlarging that the present invention proposes is the tunnel excavation method in duplex arch tunnel, and concrete steps are following:
The existing single-hole tunnel is as the middle pilot tunnel in duplex arch tunnel, and multibreak face is executed and made mid-board, the distance that staggers excavation cavern, the left and right sides; Existing tunnel is carried out on the mid-board right side banket, filling length is footpath, 1-2 times of existing single-hole hole, then to the new built tunnel of its left side excavation; New built tunnel excavation is earlier executed and is done temporary lining away from the sidewall pilot tunnel of middle pilot tunnel, excavates the soil body in the middle of the newly-built cavern then; The excavation of the middle soil body adopts the up/down steps method, and the excavation back construction false stull of topping bar is removed temporary lining after excavation is accomplished; The preliminary bracing in sealing tunnel is executed at last and is made two linings; Two linings are executed and are done excavation cavern, right side behind the certain distance, banket in this side cavern excavation existing tunnel earlier, and all the other steps are with to build the cavern identical, and the distance that staggers is directly definite by the Dan Dong hole in duplex arch tunnel.
Among the present invention, the multibreak face of pilot tunnel is executed and made mid-board in the conduct of said existing single-hole tunnel, and is wrong then apart from excavation cavern, the left and right sides, and excavation is preceding can to adopt pipe canopy, slip casting etc. to pay the measure of protecting in advance according to the newly-built cavern of country rock grade.When mid-board height during less than existing single-hole tunnel clear height, mid-board top is executed and is made duplex arch tunnel and just prop up structure, and head room clearance adopts slip casting to fill simultaneously, makes it closely knit.
Among the present invention, banket in the middle pilot tunnel opposite side hollow sectors of banketing before the new cavern excavation of excavation earlier, excavate side pilot tunnel then, and execute and do temporary lining and tunnel preliminary bracing, afterwards the excavation middle part soil body and in time seal tunnel support away from middle pilot tunnel.Back excavation cavern's tunneling formerly two linings are wrong apart from construction after executing and doing to accomplish, and banket in excavation existing tunnel inside earlier, excavates the sidewall pilot tunnel away from middle pilot tunnel then, and all the other processes are identical with the newly-built cavern of said opposite side order.
Among the present invention, each sequence of construction of said tunnel staggers on time, space.The mid-board construction is staggered processing construction hole, at least 1.5 times of existing single-hole tunnels, mid-board top directly, and mid-board bankets and staggers 1-2 times of Dan Dong hole of sidewall pilot drive, elder generation excavation cavern directly.The side wall drift of excavation cavern middle part soil excavation hysteresis earlier excavates footpath, at least 1 times of Dan Dong hole, executes prior to two linings and does to lag behind at least 2 times of holes directly.Pilot tunnel bankets and excavates footpath, hysteresis opposite side at least 1 times of hole of two lining constructions in the back built tunnel, prior to footpath, at least 1 times of Dan Dong hole of sidewall pilot drive.
The invention has the advantages that the two-way traffic interference can also make full use of tunnel space and extend linear coupling in the time of less, in work progress, utilize existing tunnel to carry out multibreak mid-board construction and practice thrift the duration apart from excavating with wrong.
Description of drawings
Fig. 1 is a duplex arch tunnel structure sketch map for the existing single-hole tunnel enlarging.
Fig. 2 is mid-board construction sketch map.
Fig. 3 is tunnel, a left side cavern excavation sketch map.
Fig. 4 is a right side cavern excavation sketch map.
Label among the figure: 1 is the existing single-hole tunnel, and 2 is that existing tunnel just props up and two linings, and 3 is mid-board; 4 is newly-built tunnel support structure, and 5 is the left side tunnel support structure, and 6 is the sidewall pilot tunnel temporary lining of left hole; 7 fill for the slip casting of mid-board top, and 8 for existing tunnel bankets, and 9 is middle part, left hole false stull; 10 is middle part, right hole false stull, and 11 is the sidewall pilot tunnel temporary lining of right hole, and 12 is the right side tunnel support structure.
The specific embodiment
Below in conjunction with accompanying drawing to characteristic of the present invention and application flow further explain; So that technician's of the same trade understanding; Is prerequisite with existing tunnel cavern height greater than the mid-board cavern for ease of narration; Newly-built cavern adopts twin side heading method to cooperate the construction of up/down steps method, and particular content is following:
Label 1-12 represents respectively among the accompanying drawing 1-3: 1 existing single-hole tunnel, 2 existing tunnels are just and two linings, 3 mid-boards, 4 newly-built tunnel support structures, 5 left side tunnel support structures, 6 left hole sidewall pilot tunnel temporary linings, 7 mid-board top slip castings are filled, 8 existing tunnels banket, false stull, 11 right hole sidewall pilot tunnel temporary linings, 12 right side tunnel support structures in the middle part of middle part, the 9 left holes false stull, 10 right holes.
Shown in Figure 1 for the existing single-hole tunnel enlarging be duplex arch tunnel structure sketch map.New built tunnel adopts the sidewall pilot drive, and middle part, the tunnel soil body adopts up/down steps method excavation.Existing single-hole tunnel 1 is as the middle pilot tunnel in duplex arch tunnel, and multibreak face is executed and made mid-board 3, carries out existing tunnel in mid-board 3 left sides then and bankets 8; Excavate new built tunnel on its right side, new built tunnel excavation is earlier executed and is done temporary lining 6 away from the sidewall pilot tunnel of middle pilot tunnel; Excavate the soil body in the middle of the newly-built cavern then, the middle soil body adopts the up/down steps method, executes and makes false stull 9; After accomplishing, removes excavation false stull 9, and sealing left side tunnel support structure 5; The existing tunnel that is positioned at the left side just is executed with two linings 2 and is done excavation cavern, right side behind the certain distance, and cavern, right side excavation existing tunnel earlier bankets 8, and all the other steps are with to build the cavern identical, and the distance that staggers is directly definite by the Dan Dong hole in duplex arch tunnel.
Shown in Figure 2ly be mid-board construction sketch map.When existing tunnel 1 was higher than mid-board 3 height, mid-board 3 reserved steel bars were executed and are made tunnel support structure, and space, mid-board top adopts slip casting to fill 7, then tunnel, excavation effect both sides respectively.
Shown in Figure 3 is tunnel, left side cavern excavation sketch map.Earlier existing tunnel is filled 8 before the tunnel excavation of left side; It is footpath, 1-2 times of Dan Dong hole that existing tunnel fills 8 length; Excavate side left side hole sidewall pilot tunnel temporary lining 6 then, the soil body adopts up/down steps method excavation in the middle of the tunnel, and excavation is wrong apart from being footpath, 0.5-2.0 times of Dan Dong hole; Middle part, the left hole of the excavation back construction of topping bar false stull 9, middle soil excavation are accomplished the back and are realized that existing tunnel just seals with two linings 2.Execute after left side hole sidewall pilot tunnel temporary lining 6 is removed with the existing tunnel supporting and protection structure in the newly-built tunnel contour scope and make Tunnel Second Lining.
Shown in Figure 4 is right side cavern excavation sketch map.Dig out existing tunnel before the tunnel excavation of right side earlier and fill 8; Excavate away from the tunnel-side pilot tunnel of mid-board one side then and execute and do right hole sidewall pilot tunnel temporary lining 11; Adopt wrongly apart from excavation progressively, existing tunnel bankets and 8 excavates prior to footpath, 1-2 times of Dan Dong hole of sidewall pilot drive.Behind the sidewall pilot drive; Middle part, excavation tunnel, the right side soil body adopts the construction of up/down steps method, executes behind the excavation of topping bar and makes arch supporting and protection structure and middle part false stull 10; Up/down steps is wrong apart from construction; Wrong distance is footpath, 0.5-2.0 times of Dan Dong hole, tops bar at least 1 times of hole of excavation hysteresis sidewall pilot drive directly, in time removes first of existing tunnel and two linings 2 and false stull 10, temporary lining 11 timely sealing supporting and protection structure 12. after the excavation completion of getting out of a predicament or an embarrassing situation
The above; It only is preferred embodiment of the present invention; Be not that the present invention is done any pro forma restriction; Anyly do not break away from technical scheme content of the present invention, to any simple modification, equivalent variations and modification that above embodiment did, all still belong in the scope of technical scheme of the present invention according to technical spirit of the present invention.
Claims (4)
1. an existing single-hole tunnel enlarging is the tunnel excavation method that duplex is encircleed the tunnel, it is characterized in that concrete steps are following: the existing single-hole tunnel is as the middle pilot tunnel in duplex arch tunnel, and multibreak face is executed and made mid-board; The distance that staggers excavation cavern, the left and right sides carries out existing tunnel to the mid-board right side and bankets, and filling length is footpath, 1-2 times of existing single-hole hole; Then to the new built tunnel of its left side excavation, new built tunnel excavation is earlier executed and is done temporary lining away from the sidewall pilot tunnel of middle pilot tunnel; Excavate the soil body in the middle of the newly-built cavern then; The excavation of the middle soil body adopts the up/down steps method, and the excavation back construction false stull of topping bar is removed temporary lining after excavation is accomplished; The preliminary bracing in sealing tunnel is executed at last and is made two linings; Two linings are executed and are done excavation cavern, right side behind the certain distance, banket in this side cavern excavation existing tunnel earlier, and all the other steps are with to build the cavern identical, and the distance that staggers is directly definite by the Dan Dong hole in duplex arch tunnel.
2. a kind of existing single-hole tunnel enlarging according to claim 1 is the tunnel excavation method in duplex arch tunnel, it is characterized in that adopting pipe canopy or slip casting to pay the measure of protecting in advance to IV level and above country rock before the said cavern excavation.
3. a kind of existing single-hole tunnel enlarging according to claim 1 is the tunnel excavation method in duplex arch tunnel; When it is characterized in that said mid-board height less than existing single-hole tunnel clear height; Mid-board top is executed and is made duplex arch tunnel and just prop up structure, and head room clearance adopts slip casting to fill simultaneously.
4. a kind of existing single-hole tunnel enlarging according to claim 1 is the tunnel excavation method in duplex arch tunnel; It is characterized in that each sequence of excavation staggers on time, space; The mid-board construction is staggered at least 1.5 times of existing tunnel holes of processing construction, mid-board top directly; The existing tunnel footpath, 1-2 times of Dan Dong hole of excavation cavern sidewall pilot drive earlier of staggering of banketing is carried out on the mid-board right side; Footpath, at least 1 times of Dan Dong hole of side wall drift excavation of excavation cavern middle part soil excavation hysteresis earlier; Two linings are executed and are done to lag behind footpath, at least 2 times of holes, and pilot tunnel bankets and excavates footpath, hysteresis opposite side at least 1 times of hole of two lining constructions in the back built tunnel, prior to footpath, at least 1 times of Dan Dong hole of sidewall pilot drive, back excavation cavern.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110066010 CN102121385B (en) | 2011-03-18 | 2011-03-18 | Tunnel excavation method for extending existing single-hole tunnel into double-arch tunnel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110066010 CN102121385B (en) | 2011-03-18 | 2011-03-18 | Tunnel excavation method for extending existing single-hole tunnel into double-arch tunnel |
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| CN102121385A CN102121385A (en) | 2011-07-13 |
| CN102121385B true CN102121385B (en) | 2012-12-05 |
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Families Citing this family (11)
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| CN102650212B (en) * | 2012-05-04 | 2014-04-09 | 中国十七冶集团有限公司 | Construction method for protecting partition wall in double-arch tunnel through temporary support of middle pilot tunnel |
| CN102865084B (en) * | 2012-09-29 | 2014-09-03 | 中铁二局股份有限公司 | Expanding excavation method of underground tunnel from fracture surface of double-track tunnel to ultra-large fracture surface of triple-track tunnel |
| CN103114856B (en) * | 2013-03-05 | 2015-04-01 | 福州市规划设计研究院 | Construction method for in-situ broadening and remolding of existing double-arched tunnel |
| CN103244127B (en) * | 2013-04-22 | 2016-07-06 | 中交路桥北方工程有限公司 | A kind of method accelerating Multi-arch Tunnel Construction speed |
| CN103953366B (en) * | 2014-05-20 | 2016-03-23 | 长安大学 | Mid-board top former lining cutting cavity backfill construction method when single hole tunnel changes arcading into |
| CN104061000B (en) * | 2014-06-24 | 2016-08-31 | 中铁第四勘察设计院集团有限公司 | Touch wall sinking passage formula tunnel partition wall and method of construction thereof |
| CN104329095B (en) * | 2014-09-03 | 2016-09-21 | 福州市规划设计研究院 | A kind of existing tunnel Widening Construction method |
| CN109190190A (en) * | 2018-08-13 | 2019-01-11 | 中国铁建大桥工程局集团有限公司 | The numerical analysis method that twin side heading method is constructed to surrouding rock stress and Influence of Displacement |
| CN112329107B (en) * | 2020-11-05 | 2022-05-06 | 中铁二院工程集团有限责任公司 | Bridge span type bearing structure of cross tunnel proximity region and calculation method |
| CN113153308B (en) * | 2021-03-09 | 2023-12-08 | 中铁八局集团有限公司 | Construction method for collapse section of double-arch tunnel |
| CN113250705B (en) * | 2021-06-28 | 2023-10-20 | 重庆工程职业技术学院 | Multi-arch tunnel construction method |
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- 2011-03-18 CN CN 201110066010 patent/CN102121385B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0334262B1 (en) * | 1988-03-24 | 1994-01-12 | ING. GIOVANNI RODIO & C. IMPRESA COSTRUZIONI SPECIALI S.P.A. | Method and apparatus for enlarging tunnels |
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