CN101737061B - Method for constructing double-arch tunnel by rebuilding and expanding existing single-hole tunnel - Google Patents
Method for constructing double-arch tunnel by rebuilding and expanding existing single-hole tunnel Download PDFInfo
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Abstract
The invention relates to a method for constructing a double-arch tunnel by rebuilding and expanding an existing single-hole tunnel. The technical problem to be solved by the invention is to provide a method for constructing the double-arch tunnel by rebuilding and expanding the existing single-hole tunnel, which adopts a ' middle pilot hole, the existing tunnel and a right hole' three pilot pit construction scheme, enlarges construction face and reduce excavation face and surrounding rock disturbed zone. To solve the technical problem, the invention adopts a technical scheme that the method for constructing the double-arch tunnel by rebuilding and expanding the existing single-hole tunnel comprises the following steps: 1.1 constructing the middle pilot hole parallel to the existing single-hole tunnel on one side of the existing single-hole tunnel and completing supporting construction; 1.2, constructing a left hole by sequence and zone on the basis of the existing single-hole tunnel and communicating the left hole and the middle pilot hole; and 1.3, after excavating the left hole to a certain size, constructing the right hole by sequence and zone and communicating the right hole with the middle pilot hole. The method is mainly used in highway traffic engineering and municipal traffic engineering.
Description
Technical field
The present invention relates to the tunnel reorganization and expansion of a kind of existing single-hole is the job practices of multiple-arch tunnel.Mainly be applicable to highway communication engineering and municipal traffic engineering.
Background technology
Along with the develop rapidly of Chinese national economy, the traffic volume is increasing day by day, and the existing road of part can not adapt to the requirement of communications and transportation, need carry out corresponding reorganization and expansion and just can reach corresponding service level.In the developed area, these problems become increasingly conspicuous, as reorganization and expansion of the big speedway in Shen, Shanghai-Hangzhou speedway etc.The continuing of highway, municipal infrastructure carries out, and construction of tunnel has obtained fast development, and the tunnel develops into the up-downgoing of two holes by single hole two way to be separated.No matter the transformation of urban road or the enlarging of each standard highway for the tunnel, as the part of highway, have run into the reorganization and expansion problem equally.The tunnel is different from earth construction, therefore should comprehensively prove in conjunction with the actual conditions of engineering for the reorganization and expansion scheme of established tunnel, seeks the most rational reorganization and expansion mode.
In hilling terrain high-grade highway tunnel, the mountain ridge, Midwest or the reorganization and expansion of major urban arterial highway list hole tunnel, construction scheme selects to be subjected to through regular meeting the restriction of various factors.According to tunnel two terminal strip spare differences, generally there are the three kinds of engineering proposals that can select: separate tunnel, small-clear-distance tunnel and multiple-arch tunnel scheme.Compare separate tunnel, small-clear-distance tunnel scheme, the big and risk of multiple-arch tunnel scheme construction technology complexity, difficulty of construction is difficult to control.The tunnel reconstruction and extension project is big because of technical sophistication, difficulty of construction, and domestic similar engineering is less relatively.Domestic design and construction technical research at the tunnel reorganization and expansion at present is less, mainly only rests on the aspect of certain single engineering construction technical Analysis.The engineering field that particularly single hole tunnel reorganization and expansion is a multiple-arch tunnel almost is blank.Yet along with the sharp increase of the traffic volume, domestic most city tunnels are more particularly built the problem that single hole tunnel of the remote past all is faced with reorganization and expansion, and single hole tunnel reorganization and expansion is that multiple-arch tunnel is an important directions of building development from now on.Therefore, successfully groping a cover existing single-hole tunnel reorganization and expansion is that the key technology of building of multiple-arch tunnel seems very urgent.
Summary of the invention
The technical problem to be solved in the present invention is: it is the job practices of multiple-arch tunnel that the problem that exists at the existing tunnel reorganization and expansion provides the tunnel reorganization and expansion of a kind of existing single-hole, adopt the construction scheme of " middle pilot tunnel+existing tunnel+right hole " three base tunnels, increase working face, reduce excavation face and disturbance country rock scope to reach, improve the purpose of working security.
The technical solution adopted in the present invention is: the reorganization and expansion of existing single-hole tunnel is the job practices of multiple-arch tunnel, it is characterized in that may further comprise the steps:
1.1 after existing single-hole tunnel one side applies parallel with it middle pilot tunnel, finishes supporting, apply mid-board, utilize existing single-hole tunnel and middle pilot tunnel that multiple-arch tunnel integral body is applied pipe canopy leading pre-supporting then;
1.2 the construction of left hole after middle pilot tunnel construction is finished, is removed the secondary lining in existing single-hole tunnel, then country rock is carried out branch and distinguishes the preface excavation, pilot tunnel temporary lining in the dismounting makes it be communicated with middle pilot tunnel, and immediate support;
1.3 the construction of right hole after left hole is excavated to certain drilling depth, divides the differentiation preface to excavate right hole at middle pilot tunnel opposite side, pilot tunnel temporary lining in the dismounting makes it be communicated with middle pilot tunnel, and immediate support.
Middle pilot tunnel construction sequence is as follows:
Carry out advance support, the safety of pilot drive and Stability Analysis of Structures in the assurance 2.1 utilize ductule to cooperate steel to support the centering pilot tunnel;
2.2 centering pilot tunnel barrel excavates and in time applies bolt-spary supports;
2.3 in middle pilot tunnel, apply the steel concrete mid-board, adopt the slabstone backfill and apply the temporary steel stull away from existing single-hole tunnel one side at mid-board then along its axis.
Hole, left side construction sequence is as follows:
3.1 adopt controlled blasting that the secondary lining in existing single-hole tunnel is removed, the dismounting cyclic advance is 1.5-3m;
3.2 (the Dan Dong hole directly is the footpath, Dan Dong hole of new built tunnel when secondary lining dismounting drilling depth reaches footpath, twice Dan Dong hole herein, in addition, described Dan Dong hole, back directly is the footpath, Dan Dong hole of new built tunnel), first section country rock of left hole is excavated, and in time carry out preliminary bracing;
3.3 second section country rock of left hole is excavated, and in time applies inverted arch, the preliminary bracing of left hole can in time be sealed;
3.4 when second section country rock excavation drilling depth of left hole reaches footpath, one times of Dan Dong hole, carry out left hole secondary lining and apply.Right hole construction sequence is as follows:
4.1 adopt booth pipe and steel bow member that right pilot tunnel is carried out advance support, after secondary lining dismounting drilling depth reaches footpath, four times of Dan Dong holes, then right pilot tunnel excavated, and in time carry out preliminary bracing;
4.2 when right pilot drive drilling depth reaches footpath, twice Dan Dong hole, first section arch country rock of right hole is excavated, and in time carries out preliminary bracing;
4.3 when first section arch country rock excavation drilling depth of right hole reaches footpath, one times of Dan Dong hole, first section core soil of right hole is excavated;
4.4 when core soil excavation drilling depth reaches footpath, one times of Dan Dong hole, second section country rock of right hole is excavated, and in time applies inverted arch, seal whole section;
4.5 when second section country rock excavation drilling depth of right hole reaches footpath, one times of Dan Dong hole, apply right hole arch wall secondary lining.
The minimum thickness of being separated by between pilot tunnel and the existing tunnel in described is 1.6-1.8m, the thickness of rock mass and existing single-hole Tunnel Second Lining between pilot tunnel and the existing tunnel during this thickness comprises.
The invention has the beneficial effects as follows: the present invention proposes the design theory of zero distance reorganization and expansion multiple-arch tunnel on existing single-hole tunnel original position, make full use of existing tunnel, adopt the construction scheme of " middle pilot tunnel+existing tunnel+right hole " three base tunnels, be about to big cavern and be decomposed into some small cavities, the little work in big hole, big with little generation, increased the construction working face, improved efficiency of construction and working security; The leading excavation of middle pilot tunnel has played the advance geologic prediction effect, and part underground water is carried out white-out, has improved the excavation condition; Under the relatively poor condition of weak surrounding rock and geological conditions, the excavation face is little, and disturbance country rock scope is little, greatly reduces the risk that rock burst takes place; Preliminary bracing and secondary lining sealing in time help construction and engineering safety; The sedimentation of vault and footing is less, and the rigidity of structure is bigger, overall security and firmness height.
Description of drawings
Fig. 1 is a sectional drawing of the present invention.
The specific embodiment
As shown in Figure 1, present embodiment considers that the multiple-arch tunnel that is two-way Four-Lane Road with the two-way two track tunnel enlargings in single hole is a background.The about 9m of existing single-hole tunnel 34 clear span, the about 5.5m of clear height, the about 3m of track clearance height.According to related specifications and technical standard, the headroom gauge in existing single-hole tunnel 34 can't meet the demands, and needs badly and carries out reorganization and expansion.Limit by tunnel two terminal strip spares, determine to make full use of the existing single-hole tunnel when drafting construction scheme as far as possible.Design proves repeatedly from aspects such as safety, economy, durations, proposed the construction scheme of " apply middle pilot tunnel+in conjunction with right hole, existing single-hole tunnel+apply " three base tunnels.Newly-built multiple-arch tunnel layout is basic parallel with existing single-hole tunnel 34, and both wire center distance between centers of tracks are controlled at 7.8～8.95m.The process characteristic of present embodiment is the excavation and the supporting of pilot tunnel 31 in carrying out earlier, connect and after mid-board 4 applies completion at middle pilot tunnel 31, carry out 32,33 front and back, hole, the left and right sides stagger the excavation and preliminary bracing, middle pilot tunnel 31 is for the support of mid-board 4 arcading intersection points is provided in advance.Concrete work progress may further comprise the steps:
1.1 applying parallel with it and width in existing single-hole tunnel 34 1 sides is that the middle pilot tunnel 31 of 6m is (in this example, in between pilot tunnel and existing tunnel about the about 1.7m of rock pillar minimum thickness, this thickness comprises the thickness of existing tunnel two linings), apply mid-board 4 after finishing supporting, utilize 31 pairs of multiple-arch tunnel integral body of existing single-hole tunnel 34 and middle pilot tunnel to apply pipe canopy leading pre-supporting 6 then, guarantee that the tunnel advances wide open safety of digging, and makes the country rock resistance to overturning not be subjected to excessive disturbance; In this example, the elevation scale between leading pre-supporting 6 and the multiple-arch tunnel axis is the 15-30 degree.
1.2 32 constructions of left hole after middle pilot tunnel 31 constructions are finished, are removed the secondary lining 7 in existing single-hole tunnel 34, then country rock are carried out branch and distinguish the preface excavation, pilot tunnel temporary lining in the dismounting makes it be communicated with middle pilot tunnel 31, and immediate support.
1.3 33 constructions of right hole after left hole 32 is excavated to certain drilling depth, divide the differentiation preface to excavate right hole 33 at middle pilot tunnel 31 opposite sides, pilot tunnel temporary lining in the dismounting makes it be communicated with middle pilot tunnel 31, and immediate support.
In must close traffic during pilot tunnel 31 excavation, and strengthen monitoring measurement to existing single-hole tunnel 34, adopt steel to support in case of necessity it reinforced, its construction sequence is as follows:
Carry out advance support 2.1 utilize the bassoon canopy to cooperate steel to support centering pilot tunnel 31, the safety and the Stability Analysis of Structures of pilot tunnel 31 excavations in the assurance;
2.2 centering pilot tunnel 31 barrels excavate and in time apply bolt-spary supports 3;
2.3 in middle pilot tunnel 31, apply steel concrete mid-board 4 along its axis, adopt the slabstone backfill and apply temporary steel stull 2 away from existing single-hole tunnel 34 1 sides at mid-board 4 then, the bias voltage that pilot tunnel 31 right sides produce in during with hole, a balance left side 32 excavations, the monolithic stability of assurance mid-board 4.
After middle pilot tunnel 31 constructions are finished, multiple-arch tunnel integral body is applied pipe canopy leading pre-supporting 6, carries out the construction in left hole 32 then:
3.1 adopt controlled blasting that the secondary lining 7 in existing single-hole tunnel 34 is removed, the dismounting cyclic advance is 1.5-3m, can carry out suitable adjustment according to field condition, during III level country rock, the dismounting drilling depth is 3m, and during IV level country rock, the dismounting drilling depth is 1.5m; The preliminary bracing of main hole must be removed work plane immediately following the secondary lining 7 in existing single-hole tunnel 34 and be applied, after promptly the secondary lining 7 in existing single-hole tunnel 34 is removed, along with the tunnel excavation preliminary bracing will be caught up with as early as possible.
3.2 (indication Dan Dong hole directly is the footpath, Dan Dong hole of new built tunnel herein when secondary lining 7 dismounting drilling depths reach footpath, twice Dan Dong hole, in addition, described Dan Dong hole, back directly is the footpath, Dan Dong hole of new built tunnel) time, left hole 32 first section country rocks 8 are excavated, and in time carry out preliminary bracing;
3.3 left hole 32 second section country rocks 10 are excavated, and in time apply inverted arch 11,32 preliminary bracings of left hole can in time be sealed, help construction and engineering safety;
3.4 when left hole 32 second section country rock 10 excavation drilling depths reach footpath, one times of Dan Dong hole, carrying out left hole secondary lining 12 applies, secondary lining is not only that structural safety is stocked, also will play bearing part load effect, so the timely sealing of secondary lining also helps the safety of engineering construction to structural safety.
Carry out 33 constructions of right hole at last, its step is as follows:
4.1 mark part as right pilot tunnel 14 on 33 right sides, right hole, and adopt booth pipe and steel bow member that right pilot tunnel 14 is carried out advance support, guarantee the safety of right pilot tunnel 14 constructions, after secondary lining 7 dismounting drilling depths reach footpath, four times of Dan Dong holes, right pilot tunnel 14 is excavated, and in time the excavation face is carried out preliminary bracing, to seal right pilot tunnel 14 as early as possible, guarantee that surrounding rock structure is stable;
4.2 when right pilot tunnel 14 excavation drilling depths reach footpath, twice Dan Dong hole, first section arch country rock 16 of right hole is excavated, and in time carries out preliminary bracing, guarantee Stability Analysis of Structures, for the excavation of reserving core soil 18 is created good execution conditions;
4.3 when first section arch country rock 16 excavation drilling depths of right hole reach footpath, one times of Dan Dong hole, first section core soil 18 of right hole is excavated;
4.4 when core soil 18 excavation drilling depths reach footpath, one times of Dan Dong hole, second section country rock 19 of right hole is excavated, and in time applies inverted arch 20,, help constructing and the safety of engineering to seal whole section as early as possible;
4.5 when second section country rock 19 excavation drilling depths of right hole reach footpath, one times of Dan Dong hole, apply right hole arch wall secondary lining 21.
Answer strictness to follow the basic principle of " pipe is leading, tight slip casting, weak explosion, short excavation, strong supporting, the diligent measurement, early sealing " in the construction; For guaranteeing construction safety and Stability Analysis of Structures, must adopt controlled blasting during tunnel excavation, and require the secondary lining in each construction sequence to apply immediately following work plane; Simultaneously, main hole (comprising Zuo Dong and You Dong) when excavation, backfill etc. should be set as cushion coat between mid-board 4 and main hole, reduce of the influence of the impact load of explosion generation to mid-board 4 as far as possible.
Claims (4)
1. job practices that the reorganization and expansion of existing single-hole tunnel is a multiple-arch tunnel is characterized in that may further comprise the steps:
1.1 (34) one sides apply parallel with it middle pilot tunnel (31) in the existing single-hole tunnel, utilize existing single-hole tunnel (34) and middle pilot tunnel (31) that multiple-arch tunnel integral body is applied pipe canopy leading pre-supporting (6) then;
1.2 left hole (32) construction after middle pilot tunnel (31) construction is finished, is removed the secondary lining in existing single-hole tunnel (34), then country rock is carried out branch and distinguish the preface excavation, pilot tunnel temporary lining in the dismounting makes existing single-hole tunnel (34) be communicated with middle pilot tunnel (31), and immediate support;
1.3 right hole (33) construction after left hole (32) are excavated to certain drilling depth, divides the differentiation preface to excavate right hole (33) at middle pilot tunnel (31) opposite side, pilot tunnel temporary lining in the dismounting makes right hole (33) be communicated with middle pilot tunnel (31), and immediate support,
The construction sequence of pilot tunnel is as follows in described:
Carry out advance support, the safety and the Stability Analysis of Structures of pilot tunnel in the assurance (31) excavation 1.4 utilize ductule to cooperate steel to support centering pilot tunnel (31);
1.5 centering pilot tunnel (31) barrel excavates and in time applies bolt-spary supports (3);
1.6 in middle pilot tunnel (31), apply steel concrete mid-board (4), adopt the slabstone backfill and apply temporary steel stull (2) away from existing single-hole tunnel (34) one sides at mid-board (4) then along its axis.
2. existing single-hole according to claim 1 tunnel reorganization and expansion is the job practices of multiple-arch tunnel, it is characterized in that left hole construction sequence is as follows:
2.1 adopt controlled blasting that the secondary lining (7) of existing single-hole tunnel (34) is removed, the dismounting cyclic advance is 1.5-3m;
2.2 when secondary lining (7) dismounting drilling depth reaches footpath, twice Dan Dong hole, left hole (32) first section country rock (8) is excavated, and in time carries out preliminary bracing;
2.3 left hole (32) second section country rock (10) is excavated, and in time applies inverted arch (11), left hole (32) preliminary bracing can in time be sealed;
2.4 when left hole (32) second section country rock (10) excavation drilling depth reaches footpath, one times of Dan Dong hole, carry out left hole secondary lining (12) and apply.
3. existing single-hole according to claim 1 tunnel reorganization and expansion is the job practices of multiple-arch tunnel, it is characterized in that right hole construction sequence is as follows:
3.1 mark part as right pilot tunnel (14) on You Dong (33) right side, and adopt booth pipe and steel bow member that right pilot tunnel (14) is carried out advance support, after secondary lining (7) dismounting drilling depth reaches footpath, four times of Dan Dong holes, right pilot tunnel (14) is excavated, and in time carry out preliminary bracing;
3.2 when right pilot tunnel (14) excavation drilling depth reaches footpath, twice Dan Dong hole, first section arch country rock (16) of right hole is excavated, and in time carries out preliminary bracing;
3.3 when first section arch country rock (16) excavation drilling depth of right hole reaches footpath, one times of Dan Dong hole, first section core soil (18) of right hole is excavated;
3.4 when core soil (18) excavation drilling depth reaches footpath, one times of Dan Dong hole, second section country rock (19) of right hole is excavated, and in time applies inverted arch (20), seal whole section;
3.5 when second section country rock (19) excavation drilling depth of right hole reaches footpath, one times of Dan Dong hole, apply right hole arch wall secondary lining (21).
4. existing single-hole according to claim 1 tunnel reorganization and expansion is the job practices of multiple-arch tunnel, it is characterized in that: the thickness of being separated by between pilot tunnel (31) and the existing tunnel in described is 1.6-1.8m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101569076A CN101737061B (en) | 2009-12-24 | 2009-12-24 | Method for constructing double-arch tunnel by rebuilding and expanding existing single-hole tunnel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101569076A CN101737061B (en) | 2009-12-24 | 2009-12-24 | Method for constructing double-arch tunnel by rebuilding and expanding existing single-hole tunnel |
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| CN101737061A CN101737061A (en) | 2010-06-16 |
| CN101737061B true CN101737061B (en) | 2011-11-16 |
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- 2009-12-24 CN CN2009101569076A patent/CN101737061B/en not_active Expired - Fee Related
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