CN103939106B - A kind of double side wall pilot tunnel method is to the construction method of CRD method conversion - Google Patents
A kind of double side wall pilot tunnel method is to the construction method of CRD method conversion Download PDFInfo
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Abstract
Double side wall pilot tunnel method, to a construction method for CRD method conversion, comprises that step is as follows: when tunnel tunnel face front quality of surrounding rock overall distribution is even, the temporarily middle wall in the employing left and right sides moves realization conversion simultaneously in the middle of tunnel; When tunnel supremo's face quality of surrounding rock skewness, wherein a side quality is better, and opposite side country rock is when more broken, adopt one-sided interim in wall sidesway realize conversion. The present invention can select reasonably construction transduction pathway according to geological conditions in constructing tunnel process and orographic condition, and the object of conversion and control is clear and definite, can ensure safety for tunnel engineering, improves efficiency of construction.
Description
Technical field
The present invention relates to vcehicular tunnel, city underground engineering technical field, especially relate to a kind of double side wall and leadThe construction method of hole normal direction CRD method conversion.
Background technology
In the design and construction such as vcehicular tunnel, city underground engineering, need be according to tunnel structure span and constructionThe wall rock condition disclosing is selected different construction methods, and conversion method between different construction method is neglected alwaysDepending on, make in practice of construction engineering method conversion unorderedly follow, without Zhang Keyi, often make engineering method conversion and control tooConservative, or engineering method transfer process construction risk is excessive, causes national wealth waste or property loss, peopleMember's injures and deaths.
Summary of the invention
The object of the invention is to design the construction method of a kind of novel double side wall pilot tunnel method to the conversion of CRD method,Address the above problem.
To achieve these goals, the technical solution used in the present invention is as follows:
Double side wall pilot tunnel method, to a construction method for CRD method conversion, comprises that step is as follows:
When tunnel tunnel face front quality of surrounding rock overall distribution is even, adopt the left and right sides interim in wall simultaneously toIn the middle of tunnel, mobile realization changed;
When tunnel supremo's face quality of surrounding rock skewness, wherein a side quality is better, and opposite side country rock is forWhen broken, adopt one-sided interim middle wall sidesway to realize conversion.
When tunnel tunnel face front quality of surrounding rock overall distribution is even, self nothing on cross section is aobviousWork difference, when surrounding rock stability is easier to control, its step is as follows:
The first step, during left side is interim, the interim middle wall in wall and right side all progressively moves to center, tunnel, left sideThe interim inverted arch of base tunnel and the interim inverted arch of right side base tunnel along with the left and right sides interim in the progressively broadening of movement of wall, inBetween the constriction progressively of interim inverted arch of base tunnel;
Second step, when in described left side is interim, the interim middle wall in wall and described right side contacts, stops mobile;
The 3rd step, cancel the described right side of rear construction interim in wall, retain described left side interim in wall, willDuring described left side is interim, wall is converted to the interim middle wall in centre in CRD method, completes engineering method conversion;
When tunnel supremo's face quality of surrounding rock skewness, wherein a side quality is better, and opposite side country rock is forWhen broken, its step is as follows:
When tunnel tunnel face right front country rock is during than left front variance:
The first step, during right side is interim, wall remains unchanged, and during left side is interim, wall progressively moves to centre position, tunnel,The interim inverted arch progressively broadening thereupon of left side base tunnel, constriction progressively of the interim inverted arch of middle base tunnel;
Second step, when in described left side is interim, wall moves to centre position, stops moving, and described left side is facedTime in wall be converted to centre in CRD method interim in wall;
The 3rd step, removes the interim middle wall in described right side, completes engineering method conversion;
When tunnel tunnel face left front country rock is during than right front variance:
The first step, during left side is interim, wall remains unchanged, and during right side is interim, wall progressively moves to centre position, the right sideThe progressively broadening thereupon of the interim inverted arch of side base tunnel, constriction progressively of the interim inverted arch of middle base tunnel;
Second step, when in described right side is interim, wall moves to centre position, stops moving, and described right side is facedTime in wall be converted to centre in CRD method interim in wall;
The 3rd step, removes the interim middle wall in described left side, completes engineering method conversion;
When conversion, transformation segment length is controlled at 30-35m.
In constructing tunnel of the present invention, double side wall pilot tunnel method, to the construction method of CRD method conversion, can be slapped according to tunnelSon in face of square Change in surrounding rocks situation select corresponding translative mode, when tunnel tunnel face front Change in surrounding rocks evenAdopt the interim middle wall in the left and right sides in the middle of tunnel, to move conversion simultaneously. , when tunnel tunnel face front country rockThe left and right side difference in change opposite sex is large, adopts one-sided interim middle wall sidesway conversion, and faces by progressive adjustmentsTime in the method for wall, make to excavate base tunnel and reach predetermined size, realize the progressively conversion of engineering method. This constructionMethod is simple, can rationally utilize tunnel surrounding self bearing capacity simultaneously, effectively improves constructing tunnel effectRate and safety.
In the present invention, be to change progressive adjustments temporary support structures position according to wall rock condition, progressively change and leadThe mode of hole span, realizes double side wall pilot tunnel method and is converted to CRD method. The tunnel tunnel face when construction of double side wall base tunnelIf front Change in surrounding rocks evenly adopts the left and right sides, interim middle wall moves conversion simultaneously in the middle of tunnel. If encloseThe rock left and right side difference in change opposite sex is large, adopts one-sided interim middle wall sidesway conversion. In double side wall pilot tunnel method oneWhen wall reaches precalculated position in locating temporarily, remove the interim middle wall formation CRD method in another place.
The present invention relates to vcehicular tunnel, city underground engineering, be particularly useful for that engineering structure span is large, constructionThe underground engineering that requirement of settlement control is high. For the conventional double side wall pilot tunnel method of vcehicular tunnel and CRD method, proposeThe construction method of double side wall pilot tunnel method to CRD method conversion, for the safety conversion of two kinds of construction methods provides guarantorBarrier. The technical solution adopted for the present invention to solve the technical problems is: 1) determine two according to Change in surrounding rocks conditionThe pattern of side wall drift normal direction CRD method conversion; 2) providing double side wall pilot tunnel method according to translative mode turns to CRD methodThe path of changing.
Beneficial effect of the present invention can be summarized as follows:
1, the present invention can select reasonably to execute according to geological conditions in constructing tunnel process and orographic conditionWork transduction pathway, the object of conversion and control is clear and definite, can ensure safety for tunnel engineering, and raising is executedWork efficiency rate.
2, construction technology of the present invention is simple, and implementation cost is cheap.
Brief description of the drawings
Fig. 1 is double side wall pilot tunnel method structure chart
Fig. 2 is CRD method structure chart
Fig. 3 is two wall sidesways pattern conversion placed in the middle construction drawing.
Fig. 4 is single wall lateral displacement mode conversion construction drawing.
In Fig. 1,2,1 tunnel just serves as a contrast, 2 left sides interim in wall, 3 right sides interim in wall, 4 left side base tunnelsWall, 8 left sides in interim in the middle of the interim inverted arch of base tunnel, the interim inverted arch of 6 right side base tunnel, 7 in the middle of interim inverted arch, 5Top headings, 13 in the middle of base tunnel under base tunnel, 10 right side top headings, 11 right sides, 12 under side top heading, 9 left sidesMiddle lower base tunnel.
Detailed description of the invention
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearer, withUnder by reference to the accompanying drawings and embodiment, the present invention is further elaborated. Should be appreciated that described hereinSpecific embodiment only in order to explain the present invention, be not intended to limit the present invention.
A kind of double side wall pilot tunnel method as shown in Figures 1 to 4, to the construction method of CRD method conversion, comprises stepRapid as follows:
When tunnel tunnel face front quality of surrounding rock overall distribution is even, adopt the left and right sides interim in wall simultaneously toIn the middle of tunnel, mobile realization changed; When tunnel supremo's face quality of surrounding rock skewness, wherein a side quality is better,And opposite side country rock is when more broken, adopt one-sided interim in wall sidesway realize conversion.
In the embodiment being more preferably:
When tunnel tunnel face front quality of surrounding rock overall distribution is even, self nothing on cross section is aobviousWork difference, when surrounding rock stability is easier to control, its step is as follows: the first step, wall 2 Hes during left side is interimDuring right side is interim, wall 3 all progressively moves to center, tunnel, the interim inverted arch 4 of left side base tunnel and right side base tunnelInterim inverted arch 6 along with the left and right sides interim in the progressively broadening of movement of wall, the interim inverted arch of middle base tunnel byStep constriction; Second step, when in described left side is interim, the interim middle wall 3 in wall 2 and described right side contacts, stopsOnly mobile; The 3rd step, cancel the described right side of rear construction interim in wall 3, retain described left side interim in wall2, interim described left side middle wall 2 is converted to the interim middle wall 7 in centre in CRD method, complete engineering method conversion;
When tunnel supremo's face quality of surrounding rock skewness, wherein a side quality is better, and opposite side country rock is forWhen broken, its step is as follows:
When tunnel tunnel face right front country rock is during than left front variance: the first step, during right side is interim, wall 3 is protectedHold constantly, during left side is interim, wall 2 progressively moves to centre position, tunnel, and the interim inverted arch of left side base tunnel thereuponProgressively broadening, progressively constriction of 5 of interim inverted arch of middle base tunnel; Second step, wall 2 in described left side is interimWhile moving to centre position, stop moving, the centre that interim described left side middle wall 2 is converted in CRD method is facedTime in wall 7; The 3rd step, removes the interim middle wall 3 in described right side, completes engineering method conversion;
When tunnel tunnel face left front country rock is during than right front variance: the first step, during left side is interim, wall 2 is protectedHold constantly, during right side is interim, wall 3 progressively moves to centre position, and the interim inverted arch of right side base tunnel thereupon progressivelyBroadening, progressively constriction of 5 of interim inverted arch of middle base tunnel; Second step, in described right side is interim, wall 3 moves toWhen in the centre position, stop mobile, described right side is interim in wall 3 be converted to centre in CRD method interim inWall 7; The 3rd step, removes the interim middle wall 2 in described left side, completes engineering method conversion;
In the embodiment being more preferably: when conversion, transformation segment length is controlled at 30-35m.
In certain preferred embodiment:
As shown in Figure 3, suppose tunnel tunnel face right front, left front Change in surrounding rocks same difference, left side is facedTime in wall 2, right side interim in wall 3 progressively move (seeing Fig. 3 (2)) to centre position, left side base tunnel is interimInverted arch 4, the interim inverted arch 6 of right side base tunnel along with the left and right sides interim in the movement of wall progressively increase, middle base tunnel5 of interim inverted arch progressively shorten (seeing Fig. 3 (2)). In left side is interim, wall, the interim middle wall in right side joinWhile touching (seeing Fig. 3 (3)), stop mobile; The interim middle wall 3 in right side of canceling rear construction, retains left side and facesTime in wall 2(interim in the middle of being now converted in wall 7), complete engineering method conversion (seeing Fig. 3 (4)). Transformation segmentLength should be controlled at 30-35m.
As shown in Figure 4, suppose that tunnel tunnel face right front country rock is more poor than left front, wall during right side is interim3 remain unchanged, and during left side is interim, wall 2 progressively moves (seeing Fig. 4 (2)), left side base tunnel to centre positionInterim inverted arch 4 progressively increases thereupon, and 5 of the interim inverted arch of middle base tunnel progressively shorten (seeing Fig. 4 (2)). WhenWhen during left side is interim, wall 2 moves to centre position, stop mobile (in the middle of in interim now, wall 2 is converted toWall 7 in interim) (seeing Fig. 4 (3)), remove the interim middle wall in right side, complete engineering method conversion (seeing Fig. 4 (4)).Transformation segment length should be controlled at 30-35m.
More than by the detailed description of concrete and preferred embodiment the present invention, but those skilled in the artShould be understood that the present invention is not limited to the above embodiment, within the spirit and principles in the present invention all,Any amendment of doing, be equal to replacement etc., within protection scope of the present invention all should be included in.
Claims (2)
1. double side wall pilot tunnel method, to a construction method for CRD method conversion, is characterized in that:
When tunnel tunnel face front quality of surrounding rock overall distribution is even, self nothing on cross section is aobviousWork difference, when surrounding rock stability is easier to control, its step is as follows:
The first step, during left side is interim, the interim middle wall in wall and right side all progressively moves to center, tunnel, left sideThe interim inverted arch of base tunnel and the interim inverted arch of right side base tunnel along with the left and right sides interim in the progressively broadening of movement of wall, inBetween the constriction progressively of interim inverted arch of base tunnel;
Second step, when in described left side is interim, the interim middle wall in wall and described right side contacts, stops mobile;
The 3rd step, cancel the described right side of rear construction interim in wall, retain described left side interim in wall, willDuring described left side is interim, wall is converted to the interim middle wall in centre in CRD method, completes engineering method conversion;
When tunnel tunnel face front quality of surrounding rock skewness, wherein a side quality is better, and opposite side country rockWhen more broken, its step is as follows:
When tunnel tunnel face right front country rock is during than left front variance:
The first step, during right side is interim, wall remains unchanged, and during left side is interim, wall progressively moves to centre position, tunnel,The interim inverted arch progressively broadening thereupon of left side base tunnel, constriction progressively of the interim inverted arch of middle base tunnel;
Second step, when in described left side is interim, wall moves to centre position, stops moving, and described left side is facedTime in wall be converted to centre in CRD method interim in wall;
The 3rd step, removes the interim middle wall in described right side, completes engineering method conversion;
When tunnel tunnel face left front country rock is during than right front variance:
The first step, during left side is interim, wall remains unchanged, and during right side is interim, wall progressively moves to centre position, the right sideThe progressively broadening thereupon of the interim inverted arch of side base tunnel, constriction progressively of the interim inverted arch of middle base tunnel;
Second step, when in described right side is interim, wall moves to centre position, stops moving, and described right side is facedTime in wall be converted to centre in CRD method interim in wall;
The 3rd step, removes the interim middle wall in described left side, completes engineering method conversion.
2. double side wall pilot tunnel method according to claim 1 is to the construction method of CRD method conversion, and its feature existsIn: when conversion, transformation segment length is controlled at 30-35m.
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| CN110454171B (en) * | 2019-08-21 | 2021-03-12 | 中铁隧道局集团有限公司 | Method for converting construction from step method to double-side-wall pit guiding method in tunnel |
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| CN102720504A (en) * | 2012-06-13 | 2012-10-10 | 北京市公路桥梁建设集团有限公司 | Double-side-wall-pilot-hole subsection bench cut method construction method |
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| CN103334761B (en) * | 2013-06-28 | 2015-06-24 | 中国一冶集团有限公司 | Method of constructing shallow tunnel underground passage variable-cross section cross mid-partition wall |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107605490A (en) * | 2017-08-28 | 2018-01-19 | 中交第二航务工程局有限公司 | Single hole large cross-section tunnel double side wall construction conversion process |
| CN107605490B (en) * | 2017-08-28 | 2018-11-09 | 中交第二航务工程局有限公司 | Single hole large cross-section tunnel double side wall construction conversion process |
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