CN111271093A - Underground excavation subway station auxiliary cross passage interface primary support system and construction method - Google Patents
Underground excavation subway station auxiliary cross passage interface primary support system and construction method Download PDFInfo
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- CN111271093A CN111271093A CN202010211039.3A CN202010211039A CN111271093A CN 111271093 A CN111271093 A CN 111271093A CN 202010211039 A CN202010211039 A CN 202010211039A CN 111271093 A CN111271093 A CN 111271093A
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- 238000009412 basement excavation Methods 0.000 title claims abstract description 32
- 238000010276 construction Methods 0.000 title claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 103
- 239000010959 steel Substances 0.000 claims abstract description 103
- 239000011435 rock Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
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Abstract
The invention relates to a primary support system for an auxiliary transverse channel interface of an underground excavated subway station and a construction method. The invention can complete the stress conversion at the tunnel portal before the opening of the interface channel, greatly improve the processing precision requirement and processing difficulty of the steel frame, ensure that the interface tunnel portal completes the truncation and excavation breaking of the side wall steel frame of the arch part of the station under the protection of effective support, solve the problem of exposed suspended surface of the arch part of the station caused by the opening of the tunnel and reduce the construction risk.
Description
Technical Field
The invention relates to an interface primary support system, in particular to an auxiliary transverse passage interface primary support system of an underground excavated subway station, and a construction method of the interface primary support system, and belongs to the field of subway tunnel design construction.
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 problems, the invention provides a primary support system and a construction method for an auxiliary transverse channel interface of an underground excavated subway station, which are a simple and convenient construction method for the auxiliary transverse channel interface of the underground excavated subway station and the primary support system for supporting and opening holes firstly, are suitable for auxiliary and construction channels of the underground excavated subway station, and are also suitable for the related design fields of a large-span large-section tunnel arch side wall opening connection gateway, a wind pavilion group channel, a subway section transverse channel, a railway, a highway tunnel and the like.
The technical scheme adopted by the invention is as follows:
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 tunnel portal of the station tunnel at the board-picking primary support expanding excavation range are closely attached to the inner side of the board-picking type station tunnel to serve as a secondary lining of the station tunnel after the board-picking primary support, the primary support straight wall and the additional tunnel portal are completely constructed.
The invention also relates to a construction method of the primary support system, which comprises the following steps:
step (1), excavating the junction of the station tunnel with variable sections
Excavating the station tunnel according to the existing mode, when a standard section primary support profile steel frame of the station tunnel reaches a station tunnel cantilever plate primary support extended excavation range which is more than or equal to 1.5m outside the outer contour of an interface tunnel portal, starting extended excavation of the cantilever plate type station tunnel primary support according to the condition that the interface tunnel portal is higher than the primary support straight point of the station tunnel cantilever plate, and adjusting a station arch part arc line on one side of the portal into a cantilever plate arch straight wall; expanding excavation width to ensure that the additional portal primary support system does not invade a subsequent station tunnel secondary lining, and arranging a plate-picking primary support expanding shell anchor rod at the joint of the plate-picking type station tunnel primary support and the straight wall;
step (2), constructing an additional portal at the inner side of the auxiliary interface and constructing an advance support
After primary support of the cantilever plate type station tunnel of the interface tunnel portal section is excavated and constructed, erecting a plurality of additional tunnel portal steel frames at the inner side of a cantilever plate arch vertical wall and below the primary support of the cantilever plate type station tunnel, erecting a vertical support steel frame above the additional tunnel portal steel frames, constructing an advanced support pipe shed, and spraying concrete to finish the construction of the additional tunnel portal;
step (3), breaking the initial support and the cut-off steel frame of the vertical wall of the station tunnel at the joint, excavating the joint arch part by a step method, and erecting an auxiliary tunnel steel frame in time to construct primary support:
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 of the station tunnel along the outline of the interface tunnel portal, excavating the auxiliary channel to a deformation joint step by step, erecting an auxiliary channel steel frame in time and constructing an auxiliary tunnel initial support, and excavating and supporting the lower end face of the auxiliary tunnel interface step by step subsequently.
Further, in the step (1), the station tunnel is excavated according to the existing mode, when a standard section primary support profile steel frame of the station tunnel reaches a station tunnel cantilever primary support expanding excavation range which is larger than or equal to 1.5m outside the outer contour of the interface tunnel portal, the cantilever plate type station tunnel primary support is expanded and excavated according to the condition that the span of the interface tunnel portal is higher than the primary support straight point of the station tunnel cantilever plate, and the arc line of the station arch part at one side of the interface tunnel portal is adjusted to be a cantilever plate arch straight wall; and the additional portal invades into a subsequent station tunnel secondary lining, and after a subsequent auxiliary tunnel interface is successfully implemented, the additional portal is broken to implement a station tunnel main body structure secondary lining.
Furthermore, in the step (1), the number of steel-frame shell-expanding anchor rods is more than or equal to 2.
Further, in the step (1), if the primary support of the cantilever plate type station tunnel is not applied in the stratum with poor surrounding rocks, the cantilever plate type station tunnel is expanded and dug outwards along the profile of the primary support of the station tunnel at the primary support straight point of the cantilever plate of the station tunnel so as to ensure the stress of the tunnel arch part and control the settlement.
Furthermore, the additional portal steel frames are densely arranged or welded and connected into a whole by adopting longitudinal ribs.
Furthermore, the advanced support pipe shed adopts 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.
Furthermore, 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-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.
In the step (1), a station tunnel is normally excavated to a position which is more than or equal to 1.5m outside the outline of the interface portal, the cross section begins to be enlarged, a top arch of the cross section begins to pick up and enlarge the plate according to the position, higher than a straight point, of the interface portal, an arc line of a station arch part on one side of the portal is adjusted into a pick plate arch and a straight wall, a foot locking anchor rod is arranged at the joint of the pick plate arch and the straight wall, and each steel frame foot locking anchor rod is more than or equal to 2.
In the step (2), after the expanded excavation cross section of the station tunnel of the interface tunnel portal section is excavated and the concrete is sprayed, a plurality of additional tunnel portal steel frames are erected below the primary support of the cantilever plates on the inner side of the tunnel portal vertical wall, the steel frames are densely arranged or are welded and connected by adopting longitudinal ribs, vertical support steel frames are erected above the additional tunnel portal steel frames, and pipe sheds and other advanced supports are arranged and the concrete is sprayed, namely 'support in advance'.
In the step (3), after the primary support of the tunnel portal in the step two reaches the design strength, the tunnel portal is broken, the primary support straight wall steel frame of the station tunnel is cut off, the auxiliary channel is excavated to the deformation joint in steps, and the auxiliary channel steel frame and the primary support are erected in time, namely 'rear opening'.
Compared with the prior art, the invention has the following beneficial effects:
(1) the construction method of 'supporting before opening the hole' provided by the invention can complete stress conversion at the position of the hole door before opening the hole of the interface channel, greatly improves the processing precision requirement and processing difficulty of a steel frame, enables the interface hole door to complete truncation and excavation of a side wall steel frame of a station arch part under the protection of effective support, solves the problem of exposed suspended surface of the station arch part caused by opening the hole, and reduces the construction risk.
(2) The additional portal applied to the inner side of the interface breaking part 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 portal breaking 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) According to the invention, a local arch flat plate is adopted to be protruded outwards at the interface, an additional portal is arranged below the cantilever plate, namely, a plurality of portal steel frames are erected at the inner side of the vertical wall in a simultaneous mode, and are connected with the main body arch steel frame through the vertical supporting steel frame above the portal steel frame, then concrete is sprayed, the stress conversion at the interface is realized, and the load of a suspended surface caused by opening a hole is transmitted to the structures at the two sides of the interface portal. 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 clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within 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 language in the embodiments of the present invention does not denote any order, quantity, or importance, but rather the terms "first," "second," and similar language 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
The present embodiment further describes the present invention by combining the working method of the station excavated by the Qingdao No. 4 line, the field implementation mode of the portal interface and the patent drawings.
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 and the 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 tunnel portal 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 tunnel portal 3 is connected with a primary support of a station tunnel cantilever plate through a vertical support steel frame 10, an arch part of the additional tunnel portal 3 is provided with a pre-support tunnel shed 6 such as a pipe 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 3 in the same position, and a vertical support steel frame 10 above the additional tunnel portal and connected with the auxiliary tunnel primary support at the station.
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 doors 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 invention is not limited to the examples given, and any equivalent and similar modifications of the technical solutions of the present invention, which may be made by a person skilled in the art by reading the present specification, are intended to be covered by the scope of the claims of the present invention.
Claims (10)
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 tunnel door (3) at the board-picking type station tunnel primary support expanding excavation range (9) are constructed, a station tunnel secondary lining (5) is closely attached to the inner side of the board-picking type station tunnel primary support and primary support straight wall (4).
4. A construction method of the primary support system according to any one of claims 1 to 3, characterized in that: the method comprises the following steps:
step (1), excavating the junction of the station tunnel with variable sections
Excavating a station tunnel according to the existing mode, when a standard section primary support contour (11) of the station tunnel is steel-framed to a station tunnel lifting plate primary support extended excavation range (9) which is more than or equal to 1.5m outside the contour of an interface tunnel door, starting to extend and excavate a lifting plate type station tunnel primary support (1) according to the condition that the interface tunnel door is higher than a station tunnel lifting plate primary support straight point (8), and adjusting a station arch part arc line at one side of the interface tunnel door into a lifting plate arch straight wall (4); expanding excavation width to ensure that an additional portal primary support system does not invade a subsequent station tunnel secondary lining (5), and arranging a cantilever plate primary support expanding shell anchor rod (7) at the joint of a cantilever plate type station tunnel primary support (1) and a straight wall;
step (2), constructing an additional portal at the inner side of the auxiliary interface and constructing an advance support
After the primary support (1) of the cantilever plate type station tunnel of the interface portal section is excavated and constructed, a plurality of additional portal steel frames (3) are erected on the inner side of a cantilever plate arch vertical wall (4) and below the primary support (1) of the cantilever plate type station tunnel, vertical support steel frames (10) are erected above the additional portal steel frames (3), and after an advanced support pipe shed (6) is arranged, concrete is sprayed to complete the construction of the additional portal;
step (3), breaking the initial support and the cut-off steel frame of the vertical wall of the station tunnel at the joint, excavating the joint arch part by a step method, and erecting an auxiliary tunnel steel frame in time to construct primary support:
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 and excavating the auxiliary channel to a deformation joint step by step, erecting an auxiliary channel steel frame in time and constructing an auxiliary tunnel primary support (2), and excavating and supporting the lower end face of the auxiliary tunnel interface step by step subsequently.
5. The construction method according to claim 4, wherein: in the step (1), a station tunnel is excavated according to the existing mode, when a standard section primary support contour (11) of the station tunnel steel frame reaches a station tunnel lifting plate primary support expanded excavation range (9) which is more than or equal to 1.5m outside the outer contour of an interface portal, the lifting plate type station tunnel primary support (1) starts to be expanded and excavated according to the condition that the span of the interface portal is higher than a station tunnel lifting plate primary support straight point (8), and a station arch part arc line on one side of the portal is adjusted to be a lifting plate arch straight wall (4); and the additional portal invades into a subsequent station tunnel secondary lining (5), and after a subsequent auxiliary tunnel interface is successfully constructed, the additional portal is broken to construct a station tunnel main body structure secondary lining.
6. The construction method according to claim 4 or 5, wherein: in the step (1), each steel frame shell-expanding anchor rod is more than or equal to 2.
7. The construction method according to claim 4 or 5, wherein: in the step (1), if the primary support (1) of the cantilever plate type station tunnel is not constructed in a stratum with poor surrounding rocks, the cantilever plate primary support straight point (8) of the station tunnel is expanded and excavated along the outward arc shape of the profile of the primary support of the station tunnel so as to ensure the stress of the tunnel arch part and control the settlement.
8. The construction method according to claim 4 or 5, wherein: the additional portal steel frames (3) are densely arranged or are welded and connected into a whole by adopting longitudinal ribs.
9. The construction method according to claim 4 or 5, wherein: the advanced support pipe shed (6) adopts 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.
10. The construction method according to claim 4 or 5, wherein: the tunnel portal additional steel frame (3), the tunnel primary straight wall (4) steel frame and the vertical supporting steel frame (10) are made of steel bars welded and processed into a grid steel frame or a section steel arch frame made of I-shaped steel.
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