CN103174430B - Shallow-buried large-span water conveying tunnel three-stage five-step digging method - Google Patents
Shallow-buried large-span water conveying tunnel three-stage five-step digging method Download PDFInfo
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- CN103174430B CN103174430B CN201310122995.4A CN201310122995A CN103174430B CN 103174430 B CN103174430 B CN 103174430B CN 201310122995 A CN201310122995 A CN 201310122995A CN 103174430 B CN103174430 B CN 103174430B
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Abstract
The invention discloses a shallow-buried large-span water conveying tunnel three-stage five-step digging method which comprises the steps of 1) first-step digging, namely performing forepoling on an upper half tunnel, and digging an upper stage; 2) second-step digging, namely digging a pull trough in the middle of the tunnel; 3) third-step digging, namely digging and supporting the left wall of the tunnel; 4) fourth-step digging, namely digging and supporting the right wall of the tunnel; and 5) fifth-step digging, namely digging and supporting the edge wall of a lower stage. By adopting the digging method, region-by-region digging is effectively executed, overlapping of spaces and time of working procedures are fully used, the digging time periods of the working procedures are rationally used, and the deformation in the tunnel is reduced; and a lining can be quickly closed to form a ring. By adopting the digging method, the digging safety risk is effectively reduced, the digging working efficiency is improved, the digging and supporting closing time is shortened, and the deformation in the tunnel is effectively reduced.
Description
Technical field
The invention belongs to the technical fields such as water conservancy and hydropower, highway, railway, municipal engineering, specifically a kind of Shallow-buried Large-span water delivery horseshoe tunnel three step five step excavation method.
Background technology
At present, domestic conventional " shallow burial hidden digging " mainly contains: benching tunnelling method, CD method, CRD method, PBA method, three step seven footworks.And conventional excavation method operation is various, excavate shaping section little, mechanization degree is low, mostly is hand excavation, and excavation cycle period is longer, and surrouding rock deformation is comparatively large, and construction cost is high, and construction safety risk is given prominence to.
Summary of the invention
The object of the invention is to ensure tunnel excavation safety, provide the excavation method of a kind of Shallow-buried Large-span water-conveyance tunnel three step five step, the method procedure connection cycle is short, can shorten a lining support time, for the time has been won in surrouding rock deformation development.
Three step five step excavation methods of the present invention are carried out according to the following steps:
1) a step excavation: first hole advance support, excavation of topping bar: at excavator along tunnel design outline line excavation, remaining core soil in advance body, excavation face is carried out just pneumatically placed concrete and is closed, erection shaped steel arch, bow member underfooting pad concrete precast block, lay reinforced mesh, set lock pin anchor tube, sprayed mortar is to design thickness.
2) two steps excavations: kerve excavation in the middle part of tunnel, to ensure to top bar, excavation is slagged tap and traffic, and middle part kerve excavates into descending grade, both sides abutment wall remaining soils;
3) three step excavations: tunnel leftwall excavates, and then abutment wall steel grating and first hole steel grating are connected firmly, and carries out reinforcing bar linked network, lock pin anchor tube and construction of shotcrete supporting;
4) four step excavations: tunnel RightWall excavates: abutment wall steel grating and first hole steel grating are connected firmly, and carries out reinforcing bar linked network, lock pin anchor tube and construction of shotcrete supporting;
5) five steps excavation: get out of a predicament or an embarrassing situation abutment wall and inverted arch excavation, supporting.
Subregion excavation has been carried out in three step five step excavation methods of the present invention, take full advantage of the overlap of each operation at room and time, Appropriate application each operation excavation period, reduces tunnel internal strain, can comparatively fast make a lining close into ring.The each operation of this construction method maintains a certain distance, and can ensure that surrouding rock deformation is in certain scope.
Compared with prior art, the invention has the beneficial effects as follows:
1, save labour, reduce personal security risk and construction cost: due to reasonable substep, each portion excavation adopts plant equipment excavation, saves a large amount of labour to a great extent, reduces the labour intensity of workman.In addition, the improvement of labour intensity and construction environment, has effectively ensured safety and the occupational health of constructor.
2, save time, quickening progress: due to substep rationally, the each step of upper, middle and lower mutually staggers on the excavation period, for supporting is advanced by the time, the digging time simultaneously going up an operation can synchronously can be carried out with the period of next supporting, eliminate the stagnant time effects of stopping of each procedure connection, average aggregate excavation progress is the 60m/ month, substantially increases and excavates circulation timei.
The invention solves bad ground tunnel in existing groundwater table and wear that the operation that excavation technology exists under river, heavy traffic main artery is many, construction speed is slow, cost is high, surrouding rock deformation is large and the problem needing the time long closed by inverted arch.The present invention is applicable in the heavy silt loam of Shallow-buried Large-span, calcite cementation, boulder bed construction.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is described in detail:
Fig. 1 is the present invention three step seven footwork construction sequence and construction method schematic diagram.
Fig. 2 is the profile of Fig. 1.
1, a step excavation part, 2, the core soil body, 3, middle part kerve (two steps excavation part), 4, tunnel RightWall (three steps excavation parts), 5, to get out of a predicament or an embarrassing situation abutment wall (five steps excavation part), 6, inverted arch part (five steps excavation part), 7, tunnel leftwall (four steps excavation parts), 8, lock pin anchor tube, 9, a substrate arch, 10, two substrates arches, 11, level bridges, 12, two mat crowns.
Detailed description of the invention
Three step five step excavation methods of the present invention are carried out according to the following steps:
1) step excavation (1 in diagram): first hole advance support, excavation of topping bar: at excavator along tunnel design outline line excavation, remaining core soil in advance body 2, excavation face is carried out just pneumatically placed concrete and is closed, erection shaped steel arch, bow member underfooting pad concrete precast block, lay reinforced mesh, set lock pin anchor tube, sprayed mortar is to design thickness;
2) two steps excavations: in the middle part of tunnel, kerve 3 excavates, and excavation is slagged tap and traffic to ensure to top bar, and middle part kerve excavates into descending grade, both sides abutment wall remaining soils;
3) three step excavations: tunnel leftwall 7 excavates, and then abutment wall steel grating and first hole steel grating are connected firmly, and carries out reinforcing bar linked network, lock pin anchor tube and construction of shotcrete supporting;
4) four step excavations: tunnel RightWall 4 excavates: abutment wall steel grating and first hole steel grating are connected firmly, and carries out reinforcing bar linked network, lock pin anchor tube and construction of shotcrete supporting;
5) five steps excavations: get out of a predicament or an embarrassing situation abutment wall 5 and inverted arch 6 excavate, carry out supporting as stated above.
The present invention is not limited to above-mentioned implementation step, if do not depart from the spirit and scope of the present invention to various change of the present invention, if these are changed and modification belongs within claim of the present invention and equivalent technologies scope, then the present invention is also intended to comprise these changes and distortion.
Claims (1)
1. a Shallow-buried Large-span water-conveyance tunnel three step five step excavation method, is characterized in that carrying out according to the following steps:
1) a step excavation: first hole advance support, excavation of topping bar: at excavator along tunnel design outline line excavation, remaining core soil in advance body, first pneumatically placed concrete is closed excavation face, erection shaped steel arch, bow member underfooting pad concrete precast block, lay reinforced mesh, set lock pin anchor tube, sprayed mortar is to design thickness;
2) two steps excavations: kerve excavation in the middle part of tunnel, to ensure to top bar, excavation is slagged tap and traffic, and middle part kerve excavates into descending grade, both sides abutment wall remaining soils;
3) three step excavations: tunnel leftwall excavates, and then abutment wall steel grating and first hole steel grating are connected firmly, and carries out reinforcing bar linked network, lock pin anchor tube and construction of shotcrete supporting;
4) four step excavations: tunnel RightWall excavates: abutment wall steel grating and first hole steel grating are connected firmly, and carries out reinforcing bar linked network, lock pin anchor tube and construction of shotcrete supporting;
5) five steps excavation: get out of a predicament or an embarrassing situation abutment wall and inverted arch excavation, supporting.
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| CN201310122995.4A CN103174430B (en) | 2013-04-10 | 2013-04-10 | Shallow-buried large-span water conveying tunnel three-stage five-step digging method |
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| CN201310122995.4A CN103174430B (en) | 2013-04-10 | 2013-04-10 | Shallow-buried large-span water conveying tunnel three-stage five-step digging method |
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| CN103174430B true CN103174430B (en) | 2015-06-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107420106A (en) * | 2017-08-08 | 2017-12-01 | 中铁六局集团有限公司 | The small spacing Under-cross tunnel excavation method in subway station and Under-cross tunnel excavation method |
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| CN104632235A (en) * | 2015-02-04 | 2015-05-20 | 北京市政建设集团有限责任公司 | Method for expanding excavation of large-diameter shield tunnel for subway station construction through pile arch wall support |
| CN107130964A (en) * | 2016-11-11 | 2017-09-05 | 新疆北方建设集团有限公司 | Small-sized tunnel mud stone excavation construction method |
| CN107013222A (en) * | 2017-05-28 | 2017-08-04 | 中铁五局集团有限公司 | A kind of the middle regions of the Yunnan Province red beds tunnel milling digging construction method close to existing railway |
| CN107387096A (en) * | 2017-09-21 | 2017-11-24 | 中铁四局集团有限公司 | The step of large-section loess tunnel three draws bracket groove to excavate the scope of operation and its construction method |
| CN108005673A (en) * | 2017-12-05 | 2018-05-08 | 中国铁路设计集团有限公司 | A kind of buried Central drain excavation method in tunnel of reserved foundation back-pressure soil |
| CN113464145A (en) * | 2021-07-06 | 2021-10-01 | 北京交通大学 | Excavation construction method for weak surrounding rock large-section tunnel |
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| CN102562075A (en) * | 2012-03-09 | 2012-07-11 | 中交第二公路工程局有限公司 | Large cross-section weak surrounding rock tunnel three-step and six-part short-distance construction method |
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| KR101247702B1 (en) * | 2010-07-09 | 2013-03-28 | (주)한국투아치 | Multi-Step Tunnel Constructing Method Using Pilot Tunnel |
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| CN101614125A (en) * | 2009-07-23 | 2009-12-30 | 中铁九局集团有限公司 | V level surrounding rock tunnel job practices |
| CN102562075A (en) * | 2012-03-09 | 2012-07-11 | 中交第二公路工程局有限公司 | Large cross-section weak surrounding rock tunnel three-step and six-part short-distance construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107420106A (en) * | 2017-08-08 | 2017-12-01 | 中铁六局集团有限公司 | The small spacing Under-cross tunnel excavation method in subway station and Under-cross tunnel excavation method |
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