CN203476348U - Arch cover combined construction structure for shallow-buried underground excavation long-span tunnel pilot tunnels - Google Patents

Arch cover combined construction structure for shallow-buried underground excavation long-span tunnel pilot tunnels Download PDF

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Publication number
CN203476348U
CN203476348U CN201320517544.6U CN201320517544U CN203476348U CN 203476348 U CN203476348 U CN 203476348U CN 201320517544 U CN201320517544 U CN 201320517544U CN 203476348 U CN203476348 U CN 203476348U
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tunnel
ledge
arch springing
pilot
shallow buried
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CN201320517544.6U
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李学峥
王焰华
周作顺
董雪
边可
颜莓
张鸽平
郝津津
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Tianjin Municipal Engineering Design and Research Institute
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Tianjin Municipal Engineering Design and Research Institute
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Abstract

The utility model discloses an arch cover combined construction structure for shallow-buried underground excavation long-span tunnel pilot tunnels. The arch cover combined construction structure comprises the two pilot tunnels in parallel mutually, two rows of guard posts in the pilot tunnels, two arch springing top beams in parallel mutually, an arch cover structure and a tunnel second liner structure, wherein the two rows of guard posts in the pilot tunnels are in parallel mutually. The guard posts the pilot tunnels, are constructed below the pilot tunnels, the arch springing top beams are constructed on the tops of the guard posts in the pilot tunnels, the arch cover structure is constructed between the two arch springing top beams, and the tunnel second liner structure is constructed below the arch cover structure. The arch cover combined construction structure can be widely used under the upper-soft-lower-hard geological condition that upper half surrounding rocks are soft, and lower half surrounding rocks are hard for tunnels in shallow-buried underground excavation long-span tunnel engineering of metros, urban roads, highways, municipal pipelines and the like.

Description

Shallow buried covered excavation longspan tunnel pilot tunnel ledge combination construction structure
Technical field
The utility model relates to a kind of constructing structure of shallow buried covered excavation longspan tunnel, particularly a kind of pilot tunnel ledge combination construction structure.
Background technology
The application of shallow buried covered excavation construction in the engineerings such as urban track traffic, city and 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 conventional engineering method 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 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 top soft rock when bottom hard rock blasting is constructed, by the destruction of causing to a certain degree, affects 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.
Utility model content
The utility model provides a kind of shallow buried covered excavation longspan tunnel pilot tunnel ledge combination construction structure for solving the technical problem existing in known technology, it is softer that this structure can be widely used in first half country rock, " upper soft lower hard " geological condition that Lower Half country rock is harder.
The technical scheme that the utility model is taked for the technical problem existing in solution known technology is: a kind of shallow buried covered excavation longspan tunnel pilot tunnel ledge combination construction structure, comprise two pilot tunnels that are parallel to each other, fender post in the hole that two rows are parallel to each other, two arch springing Guan Liang that are parallel to each other, a ledge structure and a tunnel two-lining structure, in described hole fender post execute build in described pilot tunnel below, described arch springing Guan Liang executes on the stake top of building fender post in described hole in, described ledge structure is executed and is built between two described arch springing hat beams, described tunnel two-lining structure is executed and is built under described ledge structure.
Described pilot tunnel is provided with the supporting and protection structure being formed by reinforcing bar grid and net pneumatically placed concrete structure.
Described arch springing Guan Liang adopts reinforced concrete structure, and its section is rectangle.
In described hole, fender post is Reinforced Concrete Circular Cylinder body structure.
Described ledge structure is formed by reinforcing bar grid and net pneumatically placed concrete structure.
Described tunnel two-lining structure is cast-in-situ steel reinforced concrete closed frame structure.
In described arch springing hat beam, be provided with built-in fitting, described ledge structure is preced with between beam and is adopted built-in fitting in arch springing hat beam to be connected with the mode of reinforcing bar welding in ledge structure with described arch springing.
Between described arch springing Guan Liang and fender post in described hole, adopt reinforcing bar to be connected, and it is in aggregates to build shape.
Advantage and the good effect that the utlity model has are: adopt pilot tunnel ledge combination construction structure, 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; 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 man power and material, improved operating efficiency, the utility model can be widely used in the geological condition of tunnel is softer in first half country rock, Lower Half country rock is harder " upper soft lower hard " in the longspan tunnel engineerings such as the subway, urban road, highway, municipal pipeline of various shallow buried covered excavations construction.
To sum up, the utility model has reasonably utilized concrete fender post and top ledge combining structure in pilot tunnel, has solved the structural safety problem of the shallow buried covered excavation longspan tunnel of constructing under " upper soft lower hard " geological condition.
Accompanying drawing explanation
Fig. 1 is schematic cross-sectional view of the present utility model;
Fig. 2 is connection diagram between ledge structure of the present utility model and arch springing hat beam.
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 utility model, 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 structure, comprise in the hole that two pilot tunnels that are parallel to each other, two rows are parallel to each other fender post 3, two arch springing being parallel to each other hat beams 2, ledge structure 4 and a tunnel two-lining structure 5, in described hole fender post 3 execute build in described pilot tunnel below, described arch springing hat beam 2 is executed on the stake top of building fender post 3 in described hole in, described ledge structure 4 is executed and is built between two described arch springing hat beams 2, and described tunnel two-lining structure 5 is executed and built under described ledge structure 4.
In the present embodiment, described pilot tunnel is provided with the supporting and protection structure 1 being formed by reinforcing bar grid and net pneumatically placed concrete structure.Described arch springing hat beam 2 adopts reinforced concrete structure, and its section is rectangle.In described hole, fender post 3 is Reinforced Concrete Circular Cylinder body structure.Described ledge structure 4 is formed by reinforcing bar grid and net pneumatically placed concrete structure.Described tunnel two-lining structure 5 is cast-in-situ steel reinforced concrete closed frame structure.In described arch springing hat beam 2, be provided with built-in fitting 5, described ledge structure 4 is preced with between beam 2 and is adopted built-in fitting 6 in arch springing hat beam to be connected with the mode of reinforcing bar welding in ledge structure with described arch springing.In described arch springing hat beam 2 and described hole, fender post 3 is built in aggregates.
Construction method of the present utility model:
One) first excavate pilot tunnel, constructing pilot tunnel supporting and protection structure 1;
Two), after pilot tunnel supporting and protection structure 1 completes, in leading in-cavity construction hole, fender post 3;
Three), after in hole, fender post 3 has been constructed, the built-in fitting 6 in construction arch springing hat beam 2 and arch springing hat beam, adopts reinforcing bar to be connected between arch springing hat beam 2 and fender post in hole 3, and makes their shapes in aggregates by concreting;
Four) until arch springing hat beam 2, reach after design strength, construction ledge structure 4, 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) until ledge structure 4, reach after design strength, tunneling is from top to bottom 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 hole, the design parameter of fender post 3 is determined by hydrogeological situation outside stake, the design parameter of ledge structure 4 determines by the hydrogeological situation of its top soil body, and the design parameter of tunnel two-lining structure 5 needs process of passing through tunnel structure---Load Model carries out drawing after numerical analysis.
Although by reference to the accompanying drawings preferred embodiment of the present utility model is described above; but the utility model 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 utility model; not departing from the scope situation that the utility model aim and claim protect, can also make a lot of forms, within these all belong to protection domain of the present utility model.

Claims (8)

1. a shallow buried covered excavation longspan tunnel pilot tunnel ledge combination construction structure, it is characterized in that, comprise fender post, two arch springing Guan Liang that are parallel to each other, a ledge structure and a tunnel two-lining structure in the hole that two pilot tunnels that are parallel to each other, two rows are parallel to each other, in described hole fender post execute build in described pilot tunnel below, described arch springing Guan Liang executes on the stake top of building fender post in described hole in, described ledge structure is executed and is built between two described arch springing hat beams, and described tunnel two-lining structure is executed and built under described ledge structure.
2. shallow buried covered excavation longspan tunnel pilot tunnel ledge combination construction structure according to claim 1, is characterized in that, described pilot tunnel is provided with the supporting and protection structure being formed by reinforcing bar grid and net pneumatically placed concrete structure.
3. shallow buried covered excavation longspan tunnel pilot tunnel ledge combination construction structure according to claim 1, is characterized in that, described arch springing Guan Liang adopts reinforced concrete structure, and its section is rectangle.
4. shallow buried covered excavation longspan tunnel pilot tunnel ledge combination construction structure according to claim 1, is characterized in that, in described hole, fender post is Reinforced Concrete Circular Cylinder body structure.
5. shallow buried covered excavation longspan tunnel pilot tunnel ledge combination construction structure according to claim 1, is characterized in that, described ledge structure is formed by reinforcing bar grid and net pneumatically placed concrete structure.
6. shallow buried covered excavation longspan tunnel pilot tunnel ledge combination construction structure according to claim 1, is characterized in that, described tunnel two-lining structure is cast-in-situ steel reinforced concrete closed frame structure.
7. shallow buried covered excavation longspan tunnel pilot tunnel ledge combination construction structure according to claim 5, it is characterized in that, in described arch springing hat beam, be provided with built-in fitting, described ledge structure is preced with between beam and is adopted built-in fitting in arch springing hat beam to be connected with the mode of reinforcing bar welding in ledge structure with described arch springing.
8. shallow buried covered excavation longspan tunnel pilot tunnel ledge combination construction structure according to claim 1, is characterized in that, adopt reinforcing bar to be connected, and it is in aggregates to build shape between described arch springing Guan Liang and fender post in described hole.
CN201320517544.6U 2013-08-22 2013-08-22 Arch cover combined construction structure for shallow-buried underground excavation long-span tunnel pilot tunnels Active CN203476348U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105888703A (en) * 2016-06-03 2016-08-24 北京城建设计发展集团股份有限公司 Method for constructing super-shallow-burial subway station under transverse canopy erected inside micro pilot tunnel
CN107060845A (en) * 2017-05-04 2017-08-18 湖南城市学院 Underground space structure builds construction method and application

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105888703A (en) * 2016-06-03 2016-08-24 北京城建设计发展集团股份有限公司 Method for constructing super-shallow-burial subway station under transverse canopy erected inside micro pilot tunnel
CN105888703B (en) * 2016-06-03 2019-02-26 北京城建设计发展集团股份有限公司 Super Shallow Covered Metro Station construction method under lateral canopy lid is performed in micro- pilot tunnel
CN107060845A (en) * 2017-05-04 2017-08-18 湖南城市学院 Underground space structure builds construction method and application
CN107060845B (en) * 2017-05-04 2019-01-15 湖南城市学院 Underground space structure builds construction method and application

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