CN212079331U - Underground excavation subway station subsidiary cross passage interface primary support system - Google Patents
Underground excavation subway station subsidiary cross passage interface primary support system Download PDFInfo
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- CN212079331U CN212079331U CN202020381297.1U CN202020381297U CN212079331U CN 212079331 U CN212079331 U CN 212079331U CN 202020381297 U CN202020381297 U CN 202020381297U CN 212079331 U CN212079331 U CN 212079331U
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- 238000009412 basement excavation Methods 0.000 title claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims description 73
- 239000010959 steel Substances 0.000 claims description 73
- 239000011435 rock Substances 0.000 claims description 7
- 238000010276 construction Methods 0.000 abstract description 14
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000005520 cutting process Methods 0.000 abstract description 2
- 238000003754 machining Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model relates to a secretly dig affiliated cross passage interface of subway station and just prop up system, should just prop up the system including choosing board-like station tunnel just, the attached tunnel just props up and the inboard additional portal of interface just props up the system. The utility model discloses can just accomplish the atress conversion of portal department before the opening of interface passageway, greatly improve steelframe machining precision demand and the processing degree of difficulty simultaneously, make the interface portal accomplish cutting and abolish the excavation of station hunch portion side wall steelframe under the protection of effective support, solve the station hunch portion suspended surface that the opening arouses and expose the problem, reduce the construction risk.
Description
Technical Field
The utility model relates to an interface is system of supporting just, concretely relates to undercut attached cross passage interface of subway station is system of supporting just belongs to subway tunnel design construction field.
Background
Underground excavation construction methods are often adopted in the existing rock stratums to construct subway stations, the characteristic of a single-arch large-span large-section tunnel of the underground excavation station causes that auxiliary channels often need to be provided with holes on the arc-shaped side wall of a station top arch to form an interface, a station arch part above a tunnel portal is suspended and easy to collapse when the holes are formed, along with the increase of the span and height of the auxiliary tunnel portal, the load of the upper station arch part cannot be transferred downwards due to the hole-forming suspension surface, the station arch part is biased, and the construction risk is also increased in multiples.
The existing common method is that after a main body steel frame in a tunnel door range is cut, the main body steel frame is blasted and excavated to the outer contour of a main body side wall at one time and a three-dimensional arched steel frame is immediately erected, the dimensional parameters of each truss of the three-dimensional arched steel frame are different, in order to ensure the limit, the steel frame processing needs high processing precision, so the construction quality of the three-dimensional steel frame at an interface can not be ensured, and the problem of temporary exposure of a suspended surface can not be avoided even if the steel frame is immediately erected on site and the primary support is injected and sealed, the tunnel door interface construction still adopts the working condition of firstly opening a tunnel and then supporting; if in poor stratum such as weak surrounding rock and broken zone, station tunnel and ground building can receive direct threat during the unsettled face exposes, once the hunch portion collapses, the consequence can't be imagined.
How to avoid the suspended working condition of the arch part of which the arch part is supported after the arch part is opened and the complicated manufacture of the three-dimensional space steel frame caused by opening the hole on the side wall of the arch part is a technical problem which needs to be solved urgently at present.
Disclosure of Invention
In order to solve the technical problem, the utility model provides an it is simple and easy convenient "open a hole after supporting" it is the attached horizontal passage interface worker method of underground excavation subway station and just prop up the system just to secretly dig the attached horizontal passage interface of subway station, not only is applicable to the subway and secretly digs the station and attaches and the construction passageway, is applicable to the large-span large-section tunnel hunch portion lateral wall and opens the hole and plug into access & exit, the passageway of pavilion group, the regional horizontal passage of subway and railway, highway tunnel etc. and relevant design field.
The utility model adopts the technical proposal that:
an underground excavation subway station subsidiary cross passage interface primary support system comprises a cantilever plate type station tunnel primary support, a subsidiary tunnel primary support and an additional tunnel portal primary support system at the inner side of an interface; the additional tunnel portal primary support system comprises an additional tunnel portal steel frame, a vertical support steel frame between the additional tunnel portal steel frame and a cantilever plate type station tunnel primary support, an advanced support pipe shed and a cantilever plate primary support expansion shell anchor rod; the cantilever plate primary support expansion shell anchor rod is arranged on a primary support cantilever plate straight point at the junction of the primary support of the cantilever plate type station tunnel and the primary support of the auxiliary tunnel, the driving direction of the cantilever plate primary support expansion shell anchor rod is vertical to the rock surface, and the driving distance is matched with the vertical support steel frame distance; the additional portal primary support system is connected with the cantilever plate type station tunnel primary support through a vertical support steel frame.
Further, the length of the advance support pipe shed above the tunnel arch part covers the auxiliary interface deformation joint and is not less than 6 m.
Furthermore, the board-picking primary support and the primary support straight wall and the additional portal steel frame of the board-picking tunnel are arranged around the lower side of the board-picking type station tunnel, and after the board-picking primary support and the primary support straight wall and the additional portal steel frame of the board-picking tunnel are arranged in the board-picking primary support and the primary support extended excavation range of the station tunnel, the inner side of the board-picking tunnel is closely arranged as a secondary lining of the station tunnel.
The tunnel portal additional steel frame, the tunnel primary straight wall steel frame and the vertical supporting steel frame are made of grid steel frames or section steel arches which are formed by processing I-shaped steel through welding and processing steel bars.
The initial support of the cantilever plate type station tunnel is to be outwards cantilevered in advance according to the height of the interface channel, the roof arch of the station tunnel is changed into arc and straightened, and meanwhile, proper outward expansion is carried out according to the outline of the standard section of the station, so that an operation space is provided for the construction method of 'firstly supporting and then opening a hole' when the subsequent interface channel is broken.
And a plurality of steel trusses at the interface vertical wall are connected with the primary support steel frame of the cantilever plate of the station tunnel through vertical support steel frames along additional tunnel portal arch steel frames of the tunnel portal outline.
And a small conduit, a pipe shed and other advanced support measures are arranged above the arch part of the interface straight wall steel frame, wherein the length of the pipe shed is more than or equal to the length of a deformation joint from the steel frame to the interface channel and is not less than 6 m.
The interface vertical wall steel frame is longitudinally provided with longitudinal connecting ribs, the longitudinal ribs and the interface vertical wall steel frame are arranged in a quincunx shape, and the interface vertical wall steel frame can also be welded in a close-packed manner.
The primary support foot part of the cantilever plate of the station tunnel is provided with a shell expansion anchor rod, and the shell expansion anchor rod is firmly welded with a primary support steel frame and a reinforcing mesh of the cantilever plate of the station tunnel; the primary support steel frame of the station tunnel cantilever slab is provided with longitudinal connecting ribs, the longitudinal ribs are welded with the station tunnel steel frame in a quincunx arrangement, and the length of the shell expansion anchor rod is more than 1.5 times of that of the anchor rod of the station tunnel system; the interface vertical wall steel frame is connected with the primary support of the station tunnel cantilever plate through a vertical supporting steel frame, and the vertical steel frame is also longitudinally provided with longitudinal connecting ribs and arranged in a quincunx shape.
Compared with the prior art, the beneficial effects of the utility model are specifically as follows:
(1) the utility model provides a "support earlier and open a hole" worker method can just accomplish the atress conversion of portal department before interface channel opens a hole, greatly improves steelframe machining precision demand and the processing degree of difficulty simultaneously, makes the interface portal accomplish the truncation of station hunch portion side wall steelframe and abolishes the excavation under the protection of effective support, solves the station hunch portion suspended surface that the opening arouses and exposes the problem, reduces the construction risk.
(2) The additional tunnel portal applied and made at the inner side of the interface breaking part of the utility model can effectively support the arch part of the station tunnel above, bear the suspended load of the arch part of the station tunnel caused by the breaking of the tunnel portal and control the vault settlement of the station tunnel; the vertical wall under the primary support of the cantilever slab of the station tunnel converts the manufacturing problem of a three-dimensional steel frame matched with a common hole-opening method into the problem of a planar two-dimensional steel frame, greatly reduces the processing difficulty of the steel frame, realizes the segmental excavation of rock mass during hole breaking, supports the channel along with the excavation and the ideal working condition that the primary support steel frame is closed along with the step by step, has strong operability and rapid timeliness, obviously reduces the operation risk of opening the arch wall of the station tunnel, effectively shortens the construction period, has higher social, economic and engineering benefits, and has wide practical value in the fields of subways, large iron, highways, underwater tunnels and the like.
(3) The utility model discloses adopt local crown to encircle the dull and stereotyped cantilever at the kneck, set up additional portal in the slab below of choosing, the vertical support steelframe that directly stands many pin portal steelframes in the inboard wall promptly and through its top encircles the steelframe with the main part crown and link to each other the back injection concrete, realizes the atress conversion of kneck, will transmit to the structural of interface portal both sides because of the unsettled face load that the opening arouses. After the stress system is converted, the main body arch wall interface is broken under the protection of the additional portal with the plurality of steel frames which are connected in parallel, and the smooth excavation of the auxiliary channel and the construction transverse channel is realized.
Drawings
Fig. 1 is a schematic cross-sectional view of a primary support system according to a first embodiment of the present invention;
FIG. 2 is a schematic view of the cross-sectional structure A-A of FIG. 1;
FIG. 3 is a schematic view of the cross-sectional structure B-B of FIG. 1;
fig. 4 is a schematic cross-sectional view of a primary support system according to a second embodiment of the present invention;
in the figure, 1-primary support of a plate-picking type station tunnel, 2-primary support of an auxiliary tunnel, 3-additional portal steel frame, 4-primary support straight wall of the station tunnel, 5-secondary lining structure of the station tunnel, 6-advanced support pipe shed, 7-primary support expanding shell anchor rod of a plate-picking, 8-primary support straight point of the plate-picking of the station tunnel, 9-primary support expanding excavation range of the plate-picking of the station tunnel, 10-vertical support steel frame above the portal steel frame, and 11-standard section primary support outline of the station tunnel.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Unless otherwise defined, technical or scientific terms used in the embodiments of the present application should have the ordinary meaning as understood by those having ordinary skill in the art to which the present invention belongs. The use of "first," "second," and similar terms in the embodiments of the invention do not denote any order, quantity, or importance, but rather the embodiments are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. "Upper," "lower," "left," "right," "lateral," "vertical," and the like are used solely in relation to the orientation of the components in the figures, and these directional terms are relative terms that are used for descriptive and clarity purposes and that can vary accordingly depending on the orientation in which the components in the figures are placed.
Example 1
This embodiment combines blue island 4 lines to secretly dig station worker's method, the on-the-spot embodiment of portal interface and patent drawing right the utility model discloses it is further elucidated.
As shown in fig. 1, the primary support system for the interface of the auxiliary horizontal passage of the underground excavated subway station includes a primary support for a tunnel cantilever plate of the station, a primary support 2 for an auxiliary tunnel, and an additional primary support system for a tunnel portal inside the interface.
The additional portal supporting system comprises an additional portal steel frame 3, primary support spraying concrete, a vertical supporting steel frame 10 between the additional portal steel frame and primary support of the cantilever slab, an advanced supporting pipe shed 6 and a cantilever slab primary support expansion shell anchor rod 7.
The station tunnel should select suitable first board of choosing to get straight point 8 and beat the board at the juncture and set up the board of choosing and rise shell stock 7 according to the span and the height of affiliated tunnel 2, and as the safe deposit of subsiding when follow-up broken hole cuts 1 steelframe of station tunnel first, rise shell stock and set up the direction and should perpendicular with the rock face and set up interval and steelframe interval phase-match. An additional portal steel frame 3 connected by a plurality of steel frames is arranged below a station tunnel interface vertical wall, namely the inner side of a channel interface, the additional portal steel frame 3 passes through a vertical supporting steel frame 10 to be connected with a primary support of a station tunnel cantilever plate, an arch part of the additional portal steel frame is provided with a pre-support tubular shed 6 such as a tubular shed and a small pipe, and the pre-support length 6 is required to cover an auxiliary interface deformation joint and is not less than 6 m.
As shown in fig. 2, the station longitudinal section view of the primary support system of the auxiliary cross-channel interface of the underground excavated subway station according to the embodiment includes a cantilever plate type primary support 1 of the station tunnel at the auxiliary portal, a standard section primary support of the station tunnel, a primary support 2 of the auxiliary tunnel below the primary support of the station, an advance support pipe shed 6 arranged above the primary support vault, and a cantilever plate primary support expansion shell anchor rod 7.
As shown in fig. 3, the longitudinal section view at the auxiliary horizontal passage interface of the underground excavation subway station auxiliary horizontal passage interface primary support system in this embodiment includes an auxiliary tunnel primary support 1 at the auxiliary tunnel portal, an auxiliary primary support 2 below the auxiliary tunnel primary support 1, an additional tunnel portal steel frame 3 in the same position, and a vertical support steel frame 10 above the additional tunnel portal steel frame and connected to the station cantilever slab primary support.
The construction method of the primary support system of the embodiment comprises the following steps:
step (1), excavating the junction of the station tunnel with variable sections
The station tunnel is excavated according to the existing mode, as shown in fig. 2, when assuming that the initial support expanding excavation range of the station tunnel from a standard section initial support contour 11 steel frame of the station tunnel to an interface portal contour which is more than or equal to 1.5m, the initial support 1 of the station tunnel is expanded and excavated according to the interface portal span higher than a straight point 8, the arc of the station arch part on one side of the portal is adjusted to be the initial support straight wall 4 of the station tunnel, and the expanding excavation width should ensure that the auxiliary portal 3 does not invade the secondary lining structure 5 of the subsequent station tunnel. And a shell-expanding anchor rod 7 is arranged at the joint of the primary support of the cantilever plate and the straight wall, and each steel frame shell-expanding anchor rod is more than or equal to 2.
Step (2), constructing an additional portal at the inner side of the auxiliary interface and setting an advance support (namely 'support first')
After the primary support excavation of the station tunnel of the interface tunnel door section is finished and implemented, a plurality of additional tunnel door steel frames 3 are erected on the inner side of a primary support straight wall 4 of the station tunnel and below a primary support 1 of the cantilever plate type station tunnel, the steel frames are densely arranged or are welded and connected into a whole by adopting longitudinal ribs, vertical support steel frames 10 are erected above the additional tunnel door steel frames 3, pipe sheds and the like are arranged for advanced support, then concrete is sprayed, and the implementation of the additional tunnel door steel frames 3 is finished. The advanced support can adopt a pipe shed with the diameter of 76-108 mm, the wall thickness of 8mm and the length of not less than 6m, and is supplemented with a small pipe with the diameter of 42 mm, the wall thickness of 3.5mm and the length of not less than 3.5 m.
Step (3) removing the initial support and the cut-off steel frame of the vertical wall of the station tunnel at the joint, excavating the arch part of the joint by a step method, and erecting an auxiliary tunnel steel frame in time to construct primary support (namely 'rear opening')
And (3) after the initial support of the additional tunnel portal in the step (2) reaches the design strength, cutting off the initial support straight wall 4 of the station tunnel along the outline of the interface tunnel portal, excavating the auxiliary channel to a deformation joint in steps, erecting an auxiliary channel steel frame in time, constructing an auxiliary tunnel initial support 2, and excavating and supporting the lower end face of the auxiliary tunnel interface in steps.
Example 2
As shown in fig. 4, the difference between the construction method of the primary support system in this embodiment and embodiment 1 is only in the variable section excavation stage of the station tunnel at the interface in step (1): the station tunnel is excavated according to the existing mode, as shown in fig. 2, when a standard section primary support contour 11 steel frame of the station tunnel is assumed to reach a primary support expanded excavation range of a station tunnel supporting plate which is larger than or equal to 1.5m outside an interface portal outline, an arc line of a station arch part on one side of the portal is adjusted to be a primary support straight wall 4 of the station tunnel according to the profile of the primary support 1 of the station tunnel starting to expand excavation of the interface portal which is higher than a straight point 8, an additional portal can be invaded into a range of a subsequent secondary lining structure 5 of the station tunnel, after a subsequent auxiliary tunnel interface 2 is successfully constructed, the additional portal is broken, and a secondary lining of a main body structure of the station tunnel is constructed.
Example 3
In the construction method of the primary support system of this embodiment, in step (1), if the contour of the primary support 1 of the cantilever plate type station tunnel is not constructed in the stratum with poor surrounding rocks, the outward arc-shaped expanding excavation is performed along the contour of the primary support of the station tunnel at the straight point 8 of the primary support of the cantilever plate type station tunnel to ensure the stress of the tunnel arch part and control the settlement, and the rest is the same as that in embodiment 1 or 2.
The present invention is not limited to the embodiments, and any equivalent and similar changes that the technical solutions of the present invention take are covered by the protection scope of the claims of the present invention by those skilled in the art through reading the present invention.
Claims (3)
1. The utility model provides an attached cross passage interface of undercut subway station is system of just propping up which characterized in that: the tunnel primary support system comprises a cantilever plate type station tunnel primary support (1), an auxiliary tunnel primary support (2) and an additional portal primary support system on the inner side of an interface; the additional tunnel portal primary support system comprises an additional tunnel portal steel frame (3), a vertical support steel frame (10) between the additional tunnel portal steel frame (3) and a cantilever plate type station tunnel primary support (1), an advanced support pipe shed (6) and a cantilever plate primary support expansion shell anchor rod (7); the board picking primary support expanding anchor rod (7) is arranged on a primary support picking straight point (8) at the junction of the board picking type station tunnel primary support (1) and the auxiliary tunnel primary support (2), the hitting direction of the board picking primary support expanding anchor rod (7) is vertical to the rock surface, and the hitting distance is matched with the distance of the vertical support steel frame (10); the additional portal primary support system is connected with a cantilever plate type station tunnel primary support (1) through a vertical support steel frame (10).
2. The underground excavation subway station subsidiary cross passage interface primary support system according to claim 1, characterized in that: the length of the advance support pipe shed (6) above the tunnel arch part covers the auxiliary interface deformation joint and is not less than 6 m.
3. The underground excavation subway station subsidiary cross passage interface primary support system according to claim 1, characterized in that: and a board-picking type station tunnel primary support and primary support expanding excavation range (9) is arranged around the lower part of the board-picking type station tunnel primary support (1), and after the board-picking type station tunnel primary support (1), the primary support straight wall (4) and the additional portal steel frame (3) at the board-picking type station tunnel primary support expanding excavation range (9) are constructed, a station tunnel secondary lining (5) is closely constructed on the inner side of the board-picking type station tunnel primary support and primary support straight wall (4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020381297.1U CN212079331U (en) | 2020-03-24 | 2020-03-24 | Underground excavation subway station subsidiary cross passage interface primary support system |
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| CN202020381297.1U CN212079331U (en) | 2020-03-24 | 2020-03-24 | Underground excavation subway station subsidiary cross passage interface primary support system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111271093A (en) * | 2020-03-24 | 2020-06-12 | 中铁二院昆明勘察设计研究院有限责任公司 | Underground excavation subway station auxiliary cross passage interface primary support system and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111271093A (en) * | 2020-03-24 | 2020-06-12 | 中铁二院昆明勘察设计研究院有限责任公司 | Underground excavation subway station auxiliary cross passage interface primary support system and construction method |
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