CN103437783A - Shallow-buried excavation long-span pilot tunnel arch cover combined construction method - Google Patents
Shallow-buried excavation long-span pilot tunnel arch cover combined construction method Download PDFInfo
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- CN103437783A CN103437783A CN2013103712770A CN201310371277A CN103437783A CN 103437783 A CN103437783 A CN 103437783A CN 2013103712770 A CN2013103712770 A CN 2013103712770A CN 201310371277 A CN201310371277 A CN 201310371277A CN 103437783 A CN103437783 A CN 103437783A
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Abstract
The invention discloses a shallow-buried excavation long-span pilot tunnel arch cover combined construction method. The method comprises the following steps that a pilot tunnel is excavated above the design and construction position of each fender post in two rows of holes, and pilot tunnel supporting structures are constructed; after the pilot tunnel supporting structures are constructed, fender posts are constructed in the holes; after the fender posts in the holes are constructed, an arch springing crown beam is constructed on the post top of each fender post in each row of holes; after the arch springing crown beams achieve design strength, an arch cover structure is constructed between every two arch springing crown beams; after the arch cover structures achieve design strength, a tunnel is excavated to a tunnel two-lining structure base plate bottom elevation position from top to bottom; tunnel two-lining structures are constructed in sequence from bottom to top. The shallow-buried excavation long-span pilot tunnel arch cover combined construction method can be widely applied to the upper-soft and lower-hard geological condition that surrounding rocks on the upper half portion are soft and surrounding rocks on the lower half portion are hard, and ensures structure safety of the tunnels.
Description
Technical field
The present invention relates to a kind of construction of shallow buried covered excavation longspan tunnel, particularly a kind of pilot tunnel ledge combination construction engineering method.
Background technology
The application of shallow buried covered excavation construction in urban track traffic, city and the engineerings such as mountain highway tunnel, railway tunnel and city planting ductwork is very extensive.According to the difference of hydrogeology and tunnel cross-section span, shallow buried covered excavation is taked different constructions, and engineering method commonly used mainly contains at present: full section Mining Method, benching tunnelling method, CD method, CRD method, middle hole post method, double side wall pilot tunnel method and eyes engineering method etc.Softer in first half country rock for longspan tunnel, " upper soft lower hard " geological condition that the Lower Half country rock is harder, as adopt traditional middle hole post method or double side wall pilot tunnel method, the next door diaphragm structure of having constructed in to the top soft rock when the bottom hard rock blasting is constructed will cause destruction to a certain degree, affect tunnel structure safety.In addition, traditional middle hole post method or double side wall pilot tunnel method construction sequence are more, and temporary structure dismounting amount is large, can cause the waste of engineering and the prolongation of construction period.
Summary of the invention
The present invention provides a kind of shallow buried covered excavation longspan tunnel pilot tunnel ledge combination construction engineering method for solving the technical problem existed in known technology, it is softer that this engineering method can be widely used in first half country rock, " upper soft lower hard " geological condition that the Lower Half country rock is harder, the structural safety in assurance tunnel.
The technical scheme that the present invention takes for the technical problem existed in the solution known technology is: a kind of shallow buried covered excavation longspan tunnel pilot tunnel ledge combination construction engineering method comprises the following steps:
One) at first in two row holes, above the design and construction position of fender post, excavate respectively a pilot tunnel, and constructing pilot tunnel supporting and protection structure;
Two) after pilot tunnel supporting and protection structure completes, fender post in the construction hole in pilot tunnel;
Three), after in two row holes, fender post has been constructed, an arch springing Guan Liang all constructs on the stake top of fender post in every row hole;
Four) after arch springing Guan Liang reaches design strength, construction ledge structure between two arch springing hat beams;
Five), after the ledge structure reaches design strength, tunneling from top to bottom is to absolute altitude place at the bottom of the tunnel two-lining structure base plate;
Six) then from the bottom to top along doing tunnel two-lining structure.
Described step 1) the pilot tunnel supporting and protection structure in adopts reinforcing bar grid and net pneumatically placed concrete structure to form.
Described step 3) the arch springing Guan Liang in adopts reinforced concrete structure, and its section is rectangle.
Described step 1) in the hole in, fender post adopts the Reinforced Concrete Circular Cylinder body structure.
Described step 4) the ledge structure in adopts reinforcing bar grid and net pneumatically placed concrete structure to form.
Described step 6) tunnel two-lining structure in adopts cast-in-situ steel reinforced concrete closed frame structure.
Described step 3) be provided with built-in fitting in the arch springing hat beam in, the ledge structure is preced with between beam and is adopted built-in fitting in arch springing hat beam to be connected with the mode that reinforcing bar in the ledge structure welds with arch springing.
Described step 3) between the arch springing Guan Liang in and fender post in hole, adopt reinforcing bar to be connected, and make them form an integral body by concreting.
Advantage and good effect that the present invention has are: adopt pilot tunnel ledge combination construction engineering method, can form the shallow buried covered excavation longspan tunnel supporting and protection structure of space multistory, possess larger plane headroom and vertical clearance, in the hard rock geology of bottom, tunnel, adopt Blasting Excavation on the not impact of ledge structure, can meet earthwork evacuation and the movement requirement of relatively large engineering machinery simultaneously; The ledge structure possesses enough Rigidity and strengths, can will after tunnel excavation construction on earth, carry out again the construction of tunnel two-lining structure, civilwork engineering quantity and construction period have been saved, saved the man power and material, improved operating efficiency, the present invention can be widely used in the geological condition of tunnel is softer in first half country rock, the Lower Half country rock is harder " upper soft lower hard " in the longspan tunnel engineering such as the subway, urban road, highway, municipal pipeline of various shallow buried covered excavations construction.
To sum up, the present invention has reasonably utilized concrete fender post and top ledge combining structure in pilot tunnel, has solved the structural safety problem of construction shallow buried covered excavation longspan tunnel under " upper soft lower hard " geological condition.
The accompanying drawing explanation
Fig. 1 is the schematic cross-sectional view that the present invention applies;
Fig. 2 is connection diagram between ledge structure and arch springing hat beam in the present invention.
In figure: 1, pilot tunnel supporting and protection structure; 2, arch springing Guan Liang; 3, fender post in hole; 4, ledge structure; 5, tunnel two-lining structure; 6, built-in fitting.
The specific embodiment
For further understanding summary of the invention of the present invention, Characteristic, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:
Refer to Fig. 1 and Fig. 2, a kind of shallow buried covered excavation longspan tunnel pilot tunnel ledge combination construction engineering method comprises the following steps:
One) at first in two row holes, above the design and construction position of fender post 3, excavate respectively a pilot tunnel, and constructing pilot tunnel supporting and protection structure 1, pilot tunnel supporting and protection structure 1 adopts reinforcing bar grid and net pneumatically placed concrete structure to form.In hole, fender post adopts the Reinforced Concrete Circular Cylinder body structure.
Two) after pilot tunnel supporting and protection structure 1 completes, fender post 3 in the construction hole in pilot tunnel.
Three) after in two row holes, fender post 3 has been constructed, the arch springing hat beam 2 of all constructing on the stake top of fender post 3 in every row hole; And in arch springing hat beam, built-in fitting 6 is set.Between arch springing hat beam 2 and fender post in hole 3, adopt reinforcing bar to be connected, and make them form an integral body by concreting; In the present embodiment, the section of arch springing Guan Liang is rectangle.
Four) after arch springing hat beam 2 reaches design strength, construction ledge structure 4 between two arch springing hat beams 2, the ledge structure adopts reinforcing bar grid and net pneumatically placed concrete structure to form, and ledge structure 4 is preced with between beam 2 and is adopted the interior built-in fitting 6 of arch springing hat beam 2 to be connected with the mode of the interior reinforcing bar welding of ledge structure 4 with arch springing.
Five), after ledge structure 4 reaches design strength, tunneling from top to bottom is to absolute altitude place at the bottom of tunnel two-lining structure 5 base plates.
Six) then from the bottom to top along doing tunnel two-lining structure 5.In the present embodiment, tunnel two-lining structure adopts cast-in-situ steel reinforced concrete closed frame structure.
In above-mentioned hole, the design parameter of fender post 3 is determined by the hydrogeological situation in the stake outside, the design parameter of ledge structure 4 is by the hydrogeological situation decision of its top soil body, and the design parameter of tunnel two-lining structure 5 needs the process of passing through tunnel structure---and Load Model carries out drawing after numerical analysis.
Although the above is described the preferred embodiments of the present invention by reference to the accompanying drawings; but the present invention is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment is only schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away from the scope situation that aim of the present invention and claim protect, can also make a lot of forms, within these all belong to protection scope of the present invention.
Claims (8)
1. a shallow buried covered excavation longspan tunnel pilot tunnel ledge combination construction engineering method, is characterized in that, comprises the following steps:
One) at first in two row holes, above the design and construction position of fender post, excavate respectively a pilot tunnel, and constructing pilot tunnel supporting and protection structure;
Two) after pilot tunnel supporting and protection structure completes, fender post in the construction hole in pilot tunnel;
Three), after in two row holes, fender post has been constructed, an arch springing Guan Liang all constructs on the stake top of fender post in every row hole;
Four) after arch springing Guan Liang reaches design strength, construction ledge structure between two arch springing hat beams;
Five), after the ledge structure reaches design strength, tunneling from top to bottom is to absolute altitude place at the bottom of the tunnel two-lining structure base plate;
Six) then from the bottom to top along doing tunnel two-lining structure.
2. shallow buried covered excavation longspan tunnel pilot tunnel ledge combination construction engineering method according to claim 1, is characterized in that described step 1) in pilot tunnel supporting and protection structure adopt reinforcing bar grid and the formation of net pneumatically placed concrete structure.
3. shallow buried covered excavation longspan tunnel pilot tunnel ledge combination construction engineering method according to claim 1, is characterized in that described step 3) in arch springing Guan Liang adopt reinforced concrete structure, and its section is rectangle.
4. shallow buried covered excavation longspan tunnel pilot tunnel ledge combination construction engineering method according to claim 1, is characterized in that described step 1) in hole in fender post adopt the Reinforced Concrete Circular Cylinder body structure.
5. shallow buried covered excavation longspan tunnel pilot tunnel ledge combination construction engineering method according to claim 1, is characterized in that described step 4) in the ledge structure adopt reinforcing bar grid and the formation of net pneumatically placed concrete structure.
6. shallow buried covered excavation longspan tunnel pilot tunnel ledge combination construction engineering method according to claim 1, is characterized in that described step 6) in tunnel two-lining structure adopt cast-in-situ steel reinforced concrete closed frame structure.
7. shallow buried covered excavation longspan tunnel pilot tunnel ledge combination construction engineering method according to claim 5, it is characterized in that, described step 3) be provided with built-in fitting in the arch springing hat beam in, the ledge structure is preced with between beam and is adopted built-in fitting in arch springing hat beam to be connected with the mode that reinforcing bar in the ledge structure welds with arch springing.
8. shallow buried covered excavation longspan tunnel pilot tunnel ledge combination construction engineering method according to claim 1, is characterized in that described step 3) in arch springing Guan Liang and fender post in hole between adopt reinforcing bar to be connected, and make them form an integral body by concreting.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104120739A (en) * | 2014-08-11 | 2014-10-29 | 北京市政建设集团有限责任公司 | Multi-pilot tunnel excavation one-off arching construction method |
| CN104775828A (en) * | 2015-03-27 | 2015-07-15 | 广东省建筑设计研究院 | High-stability underground tunnel structure with rectangular cross-section and construction method of high-stability underground tunnel structure |
| WO2016095630A1 (en) * | 2014-12-15 | 2016-06-23 | 中铁第四勘察设计院集团有限公司 | Method for constructing extra-large variable cross section tunnel |
| CN106640121A (en) * | 2017-01-11 | 2017-05-10 | 中铁隧道勘测设计院有限公司 | Supporting structure for six-pilot-holes large-section metro station undercrossing existing line |
| CN106930768A (en) * | 2017-05-04 | 2017-07-07 | 湖南城市学院 | Tunnel Construction and application |
| CN110005420A (en) * | 2019-05-21 | 2019-07-12 | 成都市建筑设计研究院 | A kind of ledge tunneling is inverse to build underground structure and construction method |
| CN110017149A (en) * | 2019-05-21 | 2019-07-16 | 成都市建筑设计研究院 | A kind of ledge tunneling is suitable to build underground structure and construction method |
| CN110219679A (en) * | 2019-07-22 | 2019-09-10 | 西南交通大学 | A kind of soft stratum tunnel lining structure |
| CN111042833A (en) * | 2019-12-05 | 2020-04-21 | 中铁隆工程集团有限公司 | Method for simply backfilling concrete by buckling arch in guide hole of station by using hole-pile method |
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| CN201003239Y (en) * | 2006-11-08 | 2008-01-09 | 李庆武 | Assembled type triangle transversal surface sunlight greenhouse arched girder |
| CN101440708A (en) * | 2008-12-19 | 2009-05-27 | 中建国际建设有限公司 | PBA shallow buried underground excavating close range large section three-hole separated island type structure construction method |
| CN201330609Y (en) * | 2008-12-22 | 2009-10-21 | 中建国际建设有限公司 | Inside-tunnel steel support mechanical lifting device of shallow-tunneling cavern |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104120739A (en) * | 2014-08-11 | 2014-10-29 | 北京市政建设集团有限责任公司 | Multi-pilot tunnel excavation one-off arching construction method |
| WO2016095630A1 (en) * | 2014-12-15 | 2016-06-23 | 中铁第四勘察设计院集团有限公司 | Method for constructing extra-large variable cross section tunnel |
| WO2016095631A1 (en) * | 2014-12-15 | 2016-06-23 | 中铁第四勘察设计院集团有限公司 | Support structure for tunnel having ultra-large variable section |
| CN104775828A (en) * | 2015-03-27 | 2015-07-15 | 广东省建筑设计研究院 | High-stability underground tunnel structure with rectangular cross-section and construction method of high-stability underground tunnel structure |
| CN106640121A (en) * | 2017-01-11 | 2017-05-10 | 中铁隧道勘测设计院有限公司 | Supporting structure for six-pilot-holes large-section metro station undercrossing existing line |
| CN106640121B (en) * | 2017-01-11 | 2023-06-27 | 中铁第六勘察设计院集团有限公司 | Supporting structure for six-pilot tunnel large-section subway station to pass through existing line |
| CN106930768A (en) * | 2017-05-04 | 2017-07-07 | 湖南城市学院 | Tunnel Construction and application |
| CN106930768B (en) * | 2017-05-04 | 2019-01-15 | 湖南城市学院 | Tunnel Construction and application |
| CN110005420A (en) * | 2019-05-21 | 2019-07-12 | 成都市建筑设计研究院 | A kind of ledge tunneling is inverse to build underground structure and construction method |
| CN110017149A (en) * | 2019-05-21 | 2019-07-16 | 成都市建筑设计研究院 | A kind of ledge tunneling is suitable to build underground structure and construction method |
| CN110219679A (en) * | 2019-07-22 | 2019-09-10 | 西南交通大学 | A kind of soft stratum tunnel lining structure |
| CN111042833A (en) * | 2019-12-05 | 2020-04-21 | 中铁隆工程集团有限公司 | Method for simply backfilling concrete by buckling arch in guide hole of station by using hole-pile method |
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Application publication date: 20131211 |