CN116658167A - Construction method for setting central vertical shaft to build large-section crossroad tunnel of subway - Google Patents
Construction method for setting central vertical shaft to build large-section crossroad tunnel of subway Download PDFInfo
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- CN116658167A CN116658167A CN202310952961.1A CN202310952961A CN116658167A CN 116658167 A CN116658167 A CN 116658167A CN 202310952961 A CN202310952961 A CN 202310952961A CN 116658167 A CN116658167 A CN 116658167A
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- 238000010276 construction Methods 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 claims abstract description 32
- 229910000831 Steel Inorganic materials 0.000 claims description 40
- 239000010959 steel Substances 0.000 claims description 40
- 239000002689 soil Substances 0.000 claims description 39
- 241001023788 Cyttus traversi Species 0.000 claims description 22
- 238000005192 partition Methods 0.000 claims description 21
- 238000009412 basement excavation Methods 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 12
- 230000003014 reinforcing effect Effects 0.000 claims description 11
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D1/00—Sinking shafts
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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
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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
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D5/00—Lining shafts; Linings therefor
- E21D5/04—Lining shafts; Linings therefor with brick, concrete, stone, or similar building materials
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Architecture (AREA)
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- Mechanical Engineering (AREA)
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Abstract
The application belongs to the technical field of subway tunnel construction, and particularly relates to a construction method for constructing a large-section cab apron tunnel of a subway by arranging a central vertical shaft, which comprises the following steps: firstly, excavating a first section of a vertical shaft and performing primary support of the vertical shaft; step two, excavating a small pilot tunnel at the upper part of the first crossover section; step three, excavating a second section of the vertical shaft, and performing primary support of the vertical shaft; step four, excavating a small pilot tunnel at the lower part of the first crossover section; step five, excavating a transverse channel in the vertical shaft, and constructing an initial support and a temporary inverted arch of the transverse channel; the transverse channel is divided into two sections by a vertical shaft positioned in the middle of the transverse channel; step six, excavating standard sections of the sections in the two sections of transverse channels by a step method, and constructing an initial support and a temporary inverted arch; step seven, excavating crossover sections in the vertical shaft and the two sections of transverse channels according to the step sequence, and performing primary support; step eight, the construction of the tunnel structure is completed, backfilling and earthing are carried out, and the pavement is restored; the application can reduce construction cost and construction period.
Description
Technical Field
The application belongs to the technical field of subway tunnel construction, and particularly relates to a construction method for constructing a large-section cab apron tunnel of a subway by arranging a central vertical shaft.
Background
Along with the development of Chinese economy, in order to solve the problems of traffic jam and environmental pollution of large cities, the rail of the Chinese cities is developed at a high speed, and the construction scale of subway networks is continuously enlarged. Shallow buried underground excavation such as a crossover line and a foldback line in a subway section, a large-section and variable-section tunnel construction technology is complex, risks are high, and the construction technology is a difficult point of subway tunnel construction.
The tunnel with the cross section of the crossover line in the underground excavation section of the urban subway has large excavation section due to shallow burying depth, and is easy to disturb surrounding stratum during construction, so that the building above the subway and municipal pipelines are deformed, and potential safety hazards are generated; therefore, the construction risk needs to be reduced by continuously optimizing the construction technology of the large-section tunnel and selecting the advanced and reasonable construction technology.
In the traditional underground excavation interval crossover construction of the subway, a construction method is that a construction vertical shaft is selected as an auxiliary tunnel at a position about 20-30m away from the ground interval, a vertical interval tunnel is excavated to wrap the cross section of the largest cross section of the cross section, then an interval tunnel main body is excavated, the construction method needs to occupy the site at one side of the interval to carry out shaft structure construction, and the outside of the interval tunnel needs to construct a 20-30m transverse channel, which possibly has a certain influence on buildings and underground facilities at the periphery of the interval and needs additional civil engineering and space, the construction method is possibly limited under the condition of limited site conditions, and the urban facilities are possibly damaged in the subway construction; the other construction method is that the construction is carried out from the standard section to the variable section and the large-span crossover section, the size of the crossover section is frequently changed in the excavation process, the structural stress conversion is complex, the change of the crossover section and the arrangement of supporting measures must be fully considered, a finer construction scheme and a supporting technology are required to be adopted to ensure the safety and feasibility of construction, the construction difficulty is high, and potential safety hazards possibly occur.
Meanwhile, urban areas at subway sites are often complicated in environment around inter-zone crossover lines, a large number of municipal pipelines and urban buildings are arranged, construction disturbance pipelines and buildings on the outer sides of the inter-zone crossover lines are avoided as much as possible, pipeline transfer and change workload is increased, meanwhile, urban land is tense, the periphery of a site is often narrow, construction space is limited, and space for construction vertical shafts and cross channels on the outer sides of the inter-zone is lacked. The method can reduce construction procedures while avoiding influence on urban facilities outside the section, and reduces construction difficulty, which is a problem that the current section crossover large-section construction process needs to be urgently solved.
Therefore, a new construction method is necessary to design, and under the conditions that the space of the sites at two sides of an interval is limited and the building and the pipeline are complex, the construction shaft is used as an auxiliary channel, so that the excavation working face is increased, and the construction difficulty is reduced.
Disclosure of Invention
The application aims to overcome the defects of the prior art and provide a construction method for constructing a large-section cab apron tunnel of a subway by arranging a central vertical shaft.
In order to achieve the above object, the present application provides the following technical solutions:
a construction method for setting a central vertical shaft to construct a large-section crossroad tunnel of a subway comprises the following steps:
firstly, excavating a first section of a vertical shaft and performing primary support of the vertical shaft;
step two, excavating two small pilot holes at the upper parts of the first crossover sections in the first section of the vertical shaft, and constructing primary supports and temporary middle partition walls of the small pilot holes at the upper parts of the first crossover sections; the small pilot tunnel openings on the upper parts of the two first crossover sections are arranged face to face in a staggered manner;
step three, excavating a second section of the vertical shaft, and performing primary support of the vertical shaft;
step four, excavating a small pilot hole at the lower part of the first crossover section corresponding to the small pilot hole at the upper part of the first crossover section, and performing primary support and temporary middle partition wall of the small pilot hole at the lower part of the first crossover section;
step five, excavating a transverse channel in the vertical shaft, and constructing an initial support and a temporary inverted arch of the transverse channel; the transverse channel is divided into two sections by a vertical shaft positioned in the middle of the transverse channel, and the openings of the two sections of transverse channels are arranged opposite to each other and are completely staggered with the openings of the small pilot holes on the upper parts of the two first crossover sections;
step six, excavating standard sections of the sections in the two sections of transverse channels by a step method, and constructing an initial support and a temporary inverted arch;
step seven, excavating crossover sections in the vertical shaft and the two sections of transverse channels according to the steps of the small pilot tunnel at the upper part of the second crossover section, the small pilot tunnel at the lower part of the second crossover section, the upper step of the middle soil block and the lower step of the middle soil block, and performing primary support;
and step eight, after the tunnel structure construction is completed, breaking the ground structure of the vertical shaft above the vertical shaft, backfilling the earth, and recovering the pavement.
Further, in the first step, the vertical shaft is arranged above a pilot tunnel of a large-section crossover tunnel, which is close to a small-section tunnel; and excavating a first section of the vertical shaft to the bottom end of the small pilot tunnel at the upper part of the first crossover section.
Further, the first step further includes the step of setting up an advance support, including the following steps:
when the vertical shaft is excavated to the position of the arch top of the step on the transverse channel, an advanced support is arranged along the arch part of the step on the transverse channel, so that the soil body above the transverse channel is ensured to be stable;
when the vertical shaft is excavated to the arch top of the small pilot tunnel at the upper part of the first crossover section of the vertical shaft, an advance support is arranged along the arch top of the small pilot tunnel at the upper part of the first crossover section, so that the stability of soil above the small pilot tunnel at the upper part of the first crossover section is ensured.
In the second step, the first section of the vertical shaft and the bottom end of the small pilot tunnel at the upper part of the first crossover section are subjected to staggered design; when the small pilot tunnel at the upper part of the first crossover section is excavated, firstly, the shaft wall is broken, then, after the small pilot tunnel at the upper part of the first crossover section is excavated for 3-5 m, a reinforcing steel mesh sheet is hung, a reinforced grid steel frame is erected, a temporary inverted arch is erected, the cut-off grid steel frame of the shaft and the grid steel frame of the small pilot tunnel at the upper part of the first crossover section are welded together, concrete is sprayed, and a supporting system is sealed.
Further, in the third step, when the vertical shaft is excavated to the arch top of the lower step of the transverse channel, an advance support is arranged along the arch top of the lower step of the transverse channel, so that the soil body above the lower step of the transverse channel is ensured to be stable;
when the vertical shaft is excavated to the arch top of the small pilot tunnel at the lower part of the first crossover section, an advance support is arranged along the arch top of the small pilot tunnel at the lower part of the first crossover section, so that the stability of soil above the small pilot tunnel at the lower part of the first crossover section is ensured.
In the fourth step, the vertical shaft and the bottom end of the small pilot tunnel at the lower part of the first crossover section are subjected to staggered design; during construction, after the shaft wall of a vertical shaft is broken, a small pilot tunnel at the lower part of the first crossover section is excavated for 3-5 m, a reinforcing mesh is hung, a reinforced grid steel frame is erected, the cut-off grid steel frame of the vertical shaft, the small pilot tunnel at the upper part of the first crossover section and the grid steel frame of the small pilot tunnel at the lower part of the first crossover section are welded together, concrete is sprayed, and a supporting system is sealed.
In the fifth step, the staggered platform design is carried out on the vertical shaft and the bottom end of the transverse channel, and the construction steps of the transverse channel breaking are as follows:
step 5.1, breaking a shaft well wall grating in the range of an upper step at a horse head door, arranging a reinforcing ring beam in a shaft at the vault and temporary inverted arch positions of a channel when the horse head door is opened, and arranging gussets at four corners of the ring beam;
step 5.2, connecting steel bars are arranged outside the outline of the shaft opening door in a segmented mode to form a grid steel frame connected in series, so that a hidden beam is formed to ensure the stability of the shaft steel frame when the opening door is opened;
step 5.3, after a footage of one truss is excavated, a reinforcing mesh sheet is hung in time, a truss reinforcing grid steel frame is erected, the truncated vertical shaft grids and the horsehead grid steel frame are welded together, and concrete is sprayed to form a closed support;
step 5.4, closely arranging two reinforced grids in the sequence, and spraying and mixing for supporting;
step 5.5, after the upper step of the transverse channel is forwards applied for 3-5 m, breaking the well wall grating in the range of the lower step of the transverse channel, and rapidly constructing the first grating of the lower step to enable the steel grating of the horse door of the transverse channel to form a ring; the horse head door is reinforced by a close-packed grid.
Further, in the fifth step, the method further comprises the step of setting up an advance support, including the following steps:
an advanced support is arranged on the arch top of the cross channel along the crossover section, so that the soil body above the crossover section is ensured to be stable;
and an advanced support is arranged on the transverse channel along the arch top of the standard section, so that the soil body above the standard section is ensured to be stable.
In the process of excavating the crossover section in the cross section in the seventh step, the crossover section transits from a large section to a small section, the large section is constructed by adopting a double-side wall pilot tunnel method, and the small section is excavated by adopting a CD method; the concrete process of the double-side wall pilot tunnel method construction excavation is as follows:
step 7.1, taking a small pilot hole at the upper part of the first crossover section and a small pilot hole at the lower part of the first crossover section in a shaft section as pilot holes at one side of the crossover section;
step 7.2, excavating a small pilot tunnel at the upper part of the second crossover section in the two sections of transverse channels, and closing a supporting system by adopting an initial supporting and temporary middle partition wall of the small pilot tunnel at the upper part of the Shidi second crossover section;
step 7.3, excavating a small pilot tunnel at the lower part of the second crossover section in the two sections of transverse channels, and closing a supporting system by adopting an initial supporting and temporary middle partition wall of the small pilot tunnel at the lower part of the Shidi second crossover section;
step 7.4, excavating an upper step of a soil body in the middle part, performing primary support, supporting two sides of the primary support on a temporary middle partition wall of a pilot tunnel, performing temporary inverted arch to support on a lower step, and sealing a support system;
step 7.5, excavating a middle soil body lower step, performing primary support to enable two sides of the middle soil body lower step to be supported on a temporary middle partition wall of a pilot tunnel, and constructing a bottom primary support as soon as possible to enable the full section to be closed;
step 7.6, dismantling the temporary middle partition wall;
and 7.7, building an inner lining, and completing excavation and lining construction of the section tunnel at the crossover.
The beneficial effects of the application are as follows:
according to the application, the central vertical shaft is arranged to build the large-section crossline tunnel of the subway, so that construction disturbance pipelines and buildings can be avoided within the range of 20-30m outside the crossline, the pipeline migration workload is reduced, the construction space of the vertical shaft and the transverse channel outside the crossline is reduced within the range of about 20-30m, the construction period of about 60 days for the transverse channel outside the crossline is reduced, meanwhile, the transverse channel can be simultaneously excavated to two sides by the central vertical shaft, and the construction period of about 80 days can be reduced;
the partial vertical shaft can be used as a transverse channel, so that about 60 ten thousand funds are reduced for constructing the transverse channel, about 200 ten thousand funds are reduced for constructing the transverse channel outside a section crossover, and the cost is saved;
the application not only maintains the inherent advantages of increasing the working section and stabilizing the structural stress conversion of the auxiliary construction of the vertical shaft, but also can reduce the urban building damage and pipeline migration caused by the traditional construction mode of the vertical shaft and the transverse channel, meets the requirement of the auxiliary construction of the vertical shaft in a narrow space, reduces the construction cost and reduces a large amount of construction period.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. Wherein:
fig. 1 is a schematic cross-sectional view of an excavation process according to an embodiment of the present application.
Fig. 2 is a plan view of a crossover section structure in the excavation process according to an embodiment of the present application.
Fig. 3 is a schematic cross-sectional view of a second embodiment of the present application during excavation.
Fig. 4 is a plan view of a crossover section structure in the excavation process according to the second embodiment of the present application.
Fig. 5 is a schematic cross-sectional view of a third embodiment of the present application during excavation.
Fig. 6 is a plan view of a crossover section structure in the excavation process according to an embodiment of the present application.
Fig. 7 is a schematic cross-sectional view of a shaft and a cross-sectional view of an embodiment of the present application.
Fig. 8 is a plan view of a crossover section structure according to an embodiment of the present application.
Fig. 9 is a cross-sectional view of a shaft and cross-channel in accordance with an embodiment of the present application.
In the figure, a first section of a 101-vertical shaft, a second section of a 103-vertical shaft, a small pilot hole at the lower part of the first vertical shaft section, a preliminary support of a 105-transverse channel, a standard section of a 106-section, a small pilot hole at the upper part of a 107-second vertical shaft section, a small pilot hole at the lower part of a 108-second vertical shaft section, an upper step of a 109-middle soil body, a lower step of a 110-middle soil body, a 111-vertical shaft, a 112-vertical shaft section, an upper step of a 113-transverse channel and a lower step of a 114-transverse channel are formed.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the application, fall within the scope of protection of the application.
In the description of the present application, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, merely for convenience of description of the present application and do not require that the present application must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. The terms "coupled" and "connected" as used herein are to be construed broadly and may be, for example, fixedly coupled or detachably coupled; either directly or indirectly through intermediate components, the specific meaning of the terms being understood by those of ordinary skill in the art as the case may be.
The application will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.
As shown in fig. 1 to 9, a construction method for setting a central shaft to construct a large-section crossroad tunnel of a subway comprises the following steps:
firstly, excavating a first section 101 of a vertical shaft and performing primary support of the vertical shaft 111;
step two, excavating two small pilot holes 102 on the upper part of the first crossover section in the first section 101 of the vertical shaft, and performing primary support and temporary middle partition of the small pilot holes 102 on the upper part of the first crossover section; the openings of the small pilot holes 102 on the upper parts of the two first crossover sections are arranged face to face in a staggered manner; fig. 1 and fig. 2 are schematic structural diagrams of the small pilot tunnel 102 at the upper part of the first crossover section after construction is completed; because the crossover section 112 transits from a large section to a small section, and the pilot pit is constructed by adopting a step method, the small pilot tunnel 102 at the upper part of the first crossover section is excavated to a first step depth;
step three, excavating a second section 103 of the vertical shaft, and performing primary support of the vertical shaft 111;
step four, excavating a small pilot tunnel 104 at the lower part of the first crossover section corresponding to the small pilot tunnel 102 at the upper part of the first crossover section, and performing primary support and temporary middle partition of the small pilot tunnel 104 at the lower part of the first crossover section;
step five, excavating a transverse channel in the vertical shaft 111, and constructing a transverse channel primary support 105 and a temporary inverted arch; the transverse channel is divided into two sections by a vertical shaft 111 positioned in the middle of the transverse channel, and the openings of the two sections of transverse channels are arranged opposite to each other and are completely staggered with the opening of the small pilot tunnel 102 at the upper part of the first crossover section; FIG. 9 is a schematic view of a stepped construction cross channel;
step six, excavating an interval standard section 106 in the step method in the two sections of transverse channels respectively, and constructing an initial support 105 and a temporary inverted arch; fig. 3 and 4 are schematic structural diagrams of the section standard section 106 after construction is completed;
step seven, a crossover section 112 is excavated in the vertical shaft 111 and the two sections of transverse channels according to the steps of the small pilot tunnel 107 at the upper part of the second crossover section, the small pilot tunnel 108 at the lower part of the second crossover section, the upper step of the middle soil block and the lower step of the middle soil block, and primary support is applied; fig. 5 and 6 are schematic structural views of the second crossover section after the construction of the upper small pilot tunnel 107 and the lower small pilot tunnel 108;
step eight, after the tunnel structure construction is completed, breaking the ground structure of the vertical shaft above the vertical shaft 111, backfilling and earthing, and recovering the pavement; fig. 7 and 8 are schematic structural diagrams after the tunnel structure construction is completed.
Further, in the process of excavating the crossover section 112 in the cross section in the seventh step, the crossover section 112 transits from a large section to a small section, the large section is constructed by adopting a double-side wall pilot tunnel method, the small section is excavated by adopting a CD method, and the concrete process of constructing and excavating by adopting the double-side wall pilot tunnel method is as follows:
step 7.1, taking a small pilot tunnel 102 at the upper part of a first crossover section and a small pilot tunnel 104 at the lower part of the first crossover section in a shaft 111 interval as pilot pits at one side of a crossover section 112;
step 7.2, excavating a small pilot tunnel 107 at the upper part of the second crossover section in the two sections of transverse channels, and closing a supporting system by primary supporting and temporary middle partition walls of the small pilot tunnel 107 at the upper part of the Shidi second crossover section;
step 7.3, excavating a small pilot tunnel 108 at the lower part of the second crossover section in the two sections of transverse channels, performing primary support and temporary middle partition of the small pilot tunnel 108 at the lower part of the second crossover section, and sealing a support system; fig. 5 and fig. 6 are schematic structural diagrams of the second crossover section after the construction of the small pilot tunnel 108 at the lower part is completed;
7.4, excavating an upper step 109 of the soil body in the middle part, performing primary support, supporting two sides of the primary support on a temporary middle partition wall of a pilot tunnel, performing temporary inverted arch to support on a lower step, and sealing a support system;
step 7.5, excavating a middle soil body lower step 110, performing primary support, enabling two sides of the soil body lower step to be supported on a temporary middle partition wall of a pilot tunnel, and constructing a bottom primary support as soon as possible, so that the full section is closed;
step 7.6, dismantling the temporary middle partition wall;
and 7.7, constructing an inner lining, completing excavation and lining construction of the section tunnel at the crossover, and fig. 7 and 8 are schematic structural diagrams after the section tunnel construction is completed.
Further, in the first step, the shaft 111 is disposed above the pilot tunnel of the large-section crossroad tunnel, which is close to the small-section tunnel; the first section 101 of the shaft is excavated to the bottom end of the small pilot tunnel 102 at the upper part of the first crossover section.
Further, the first step further includes the step of setting up an advance support, including the following steps:
as shown in fig. 1, when the vertical shaft 111 is excavated to the arch top position of the upper step 113 of the transverse channel, an advance support is arranged along the arch part of the upper step 113 of the transverse channel, so that the soil body above the transverse channel is ensured to be stable;
when the vertical shaft 111 is excavated to the arch top of the small pilot tunnel 102 at the upper part of the first crossover section of the vertical shaft 111, an advance support is arranged along the arch top of the small pilot tunnel 102 at the upper part of the first crossover section, so that the stability of soil above the small pilot tunnel 102 at the upper part of the first crossover section is ensured.
Further, in the second step, the first section 101 of the shaft and the bottom end of the small pilot tunnel 102 at the upper part of the first crossover section are designed in a staggered manner; when the small pilot tunnel 102 at the upper part of the first crossover section is excavated, firstly, the shaft wall is broken, then, after the small pilot tunnel at the upper part of the first crossover section is excavated for 3-5 m, a reinforcing mesh sheet is hung, a reinforced grid steel frame is erected, a temporary inverted arch is erected, the cut-off grid steel frame of the shaft and the grid steel frame of the small pilot tunnel 102 at the upper part of the first crossover section are welded together, concrete is sprayed, and a supporting system is sealed.
Further, in the third step, when the vertical shaft 111 is excavated to the arch top of the lower step 114 of the transverse channel, an advance support is arranged along the arch top of the lower step 114 of the transverse channel, so that the soil body above the lower step 114 of the transverse channel is ensured to be stable;
when the vertical shaft 111 is excavated to the arch top of the small pilot tunnel 104 at the lower part of the first crossover section, an advance support is arranged along the arch top of the small pilot tunnel 104 at the lower part of the first crossover section, so that the stability of soil above the small pilot tunnel 104 at the lower part of the first crossover section is ensured.
In the fourth step, the first section 101 of the shaft and the bottom end of the small pilot tunnel 104 at the lower part of the first crossover section are designed in a staggered manner; during construction, after the shaft wall of a vertical shaft is broken, a small pilot tunnel at the lower part of the first crossover section is excavated for 3-5 m, a reinforcing mesh is hung, a reinforced grid steel frame is erected, the cut-off grid steel frame of the vertical shaft, the small pilot tunnel 102 at the upper part of the first crossover section and the grid steel frame of the small pilot tunnel 104 at the lower part of the first crossover section are welded together, concrete is sprayed, and a supporting system is sealed.
In the fifth step, the vertical shaft 111 and the bottom end of the transverse channel are designed in a staggered manner, and the transverse channel breaking construction steps are as follows:
step 5.1, breaking a shaft well wall grating in the range of an upper step at a horse head door, setting a reinforced ring beam in the shaft 111 at the vault and temporary inverted arch positions of a channel when the horse head door is opened by the shaft 111, and setting gussets at four corners of the ring beam;
step 5.2, connecting steel bars are arranged outside the outline of the opening door of the vertical shaft 111 in a segmented mode to form a grid steel frame connected in series, so that a hidden beam is formed to ensure the stability of the vertical shaft steel frame when the opening door is opened;
step 5.3, after a footage of one truss is excavated, a reinforcing mesh sheet is hung in time, a truss reinforcing grid steel frame is erected, the truncated vertical shaft grids and the horsehead grid steel frame are welded together, and concrete is sprayed to form a closed support;
step 5.4, closely arranging two reinforced grids in the sequence, and spraying and mixing for supporting;
step 5.5, after the upper step 113 of the transverse channel is forwards applied for 3-5 m, breaking the well wall grating within the range of the lower step 114 of the transverse channel, and quickly constructing the first grating of the lower step to enable the steel grating of the horse head door of the transverse channel to form a ring;
according to the application, before each horsehead door is excavated, the previous horsehead door and the vertical shaft 111 and other structures form a closed supporting system, the stress distribution is uniform, and the horsehead door is reinforced by adopting a close-packed grid steel frame, so that the stability of soil is ensured, and the construction safety is ensured.
Furthermore, because the structural stress at the intersection of the vertical shaft 111 and the transverse channel is complex, the wall concrete at the opening of the vertical shaft 111 needs to be broken during construction, the grid steel frame support at the opening needs to be cut off, and meanwhile, the structural stress in the whole vertical shaft 111 is broken to enable the stress at the opening to be redistributed, so that the soil at the opening is most easily unstable, the horse door is reinforced by adopting a closely arranged grid to ensure the structural safety of the horse door, and the cut vertical shaft grid and the horse door grid steel frame are welded together.
Further, in the fifth step, the method further comprises the step of setting up an advance support, including the following steps:
as shown in fig. 2, an advance support is arranged on the vault of the transverse channel along the crossover section 112 to ensure the stability of soil above the crossover section 112;
and an advanced support is arranged on the transverse channel along the arch top of the standard section, so that the soil body above the standard section is ensured to be stable.
According to the application, the large-section crossroad tunnel of the subway is built by arranging the central vertical shaft, the vertical shaft 111 can be used as a part of a transverse passage, so that the excavation soil volume of the transverse passage can be reduced; the horizontal channels can be excavated from the central vertical shaft 111 to two sides simultaneously, and the crossovers section 112 can be excavated in the horizontal channels simultaneously, so that the construction period can be reduced, and the cost can be saved; the application not only can keep the inherent advantages of increasing the working section and stabilizing the structural stress conversion of the auxiliary construction of the vertical shaft, but also can reduce the urban building damage and pipeline migration caused by the traditional construction of the vertical shaft and the transverse passage, meets the requirement of the auxiliary construction of the vertical shaft in a narrow space, reduces the construction cost and reduces a large amount of construction period;
the vertical shaft 111 is arranged in the center, construction difficulty is high, safety requirements are high, especially soil instability is easy to occur at the position of the horse head door of excavation, the horse head door of the upper small pilot tunnel, the horse head door of the lower small pilot tunnel and the horse head door of the transverse channel are sequentially excavated in the range of the vertical shaft 111, a reinforcing steel bar net is hung after each excavation, grid reinforcing steel bars are erected, the grid reinforcing steel bars are connected with truncated adjacent reinforcing steel bars, concrete is sprayed, a closed supporting system is formed between the previous horse head door and the vertical shaft 111 and other adjacent structures before each horse head door is excavated, stress distribution is uniform, and the horse head door is reinforced by adopting a close-packed grid steel frame, so that soil stability is guaranteed, and construction safety is guaranteed.
It is to be understood that the above description is intended to be illustrative, and that the embodiments of the present application are not limited thereto. The foregoing description of the preferred embodiments of the application is not intended to limit the application to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the application as defined by the appended claims.
Claims (10)
1. The construction method for setting a central vertical shaft to construct the large-section crossroad tunnel of the subway is characterized by comprising the following steps:
firstly, excavating a first section (101) of a vertical shaft and performing primary support of the vertical shaft (111);
step two, excavating two small pilot holes (102) at the upper parts of the first crossover sections in a first section (101) of the vertical shaft, and performing primary support and temporary middle partition walls of the small pilot holes (102) at the upper parts of the first crossover sections; the openings of the small pilot holes (102) on the upper parts of the two first crossover sections are arranged face to face in a staggered manner;
step three, excavating a second section (103) of the vertical shaft, and performing primary support of the vertical shaft (111);
step four, excavating a small pilot hole (104) at the lower part of the first crossover section corresponding to the small pilot hole (102) at the upper part of the first crossover section, and performing primary support and temporary middle partition of the small pilot hole (104) at the lower part of the first crossover section;
fifthly, excavating a transverse channel in the vertical shaft (111), and constructing a transverse channel primary support (105) and a temporary inverted arch; the transverse channel is divided into two sections by a vertical shaft (111) positioned in the middle of the transverse channel, and the openings of the two sections of transverse channels are arranged opposite to each other and are completely staggered with the openings of the small pilot tunnels (102) at the upper parts of the two first crossover sections;
step six, excavating an interval standard section (106) in the step method in the two sections of transverse channels respectively, and constructing an initial support (105) and a temporary inverted arch;
step seven, excavating a crossover section (112) in the vertical shaft (111) and the two sections of transverse channels according to the steps of the small pilot tunnel (107) at the upper part of the second crossover section, the small pilot tunnel (108) at the lower part of the second crossover section, the upper step of the middle soil block and the lower step of the middle soil block, and performing primary support;
and step eight, after the tunnel structure construction is completed, breaking the ground structure of the vertical shaft above the vertical shaft (111), backfilling and earthing, and recovering the pavement.
2. The construction method for setting up a central vertical shaft to construct a large-section crossroad tunnel of a subway according to claim 1, wherein the construction method comprises the following steps: in the first step, a vertical shaft (111) is arranged above a pilot tunnel of a large-section crossover tunnel, which is close to a small-section tunnel; and excavating a first section (101) of the vertical shaft to the bottom end of a small pilot tunnel (102) at the upper part of the first crossover section.
3. The construction method for setting up a central vertical shaft to construct a large-section crossroad tunnel of a subway according to claim 1, wherein the construction method comprises the following steps: the first step also comprises the step of setting up an advance support, comprising the following steps:
when the vertical shaft (111) is excavated to the arch top position of the upper step (113) of the transverse passage, an advance support is arranged along the arch part of the upper step (113) of the transverse passage, so that the soil body above the transverse passage is ensured to be stable;
when the vertical shaft (111) is excavated to the arch top of the small pilot tunnel (102) at the upper part of the first crossover section of the vertical shaft (111), an advance support is arranged along the arch top of the small pilot tunnel (102) at the upper part of the first crossover section, so that the stability of soil above the small pilot tunnel (102) at the upper part of the first crossover section is ensured.
4. The construction method for setting up a central vertical shaft to construct a large-section crossroad tunnel of a subway according to claim 1, wherein the construction method comprises the following steps: in the second step, the first section (101) of the vertical shaft and the bottom end of the small pilot tunnel (102) at the upper part of the first crossover section are subjected to staggered design; when the small pilot tunnel (102) at the upper part of the first crossover section is excavated, firstly, the shaft wall is broken, then, after the small pilot tunnel (102) at the upper part of the first crossover section is excavated for 3-5 m, a reinforcing steel mesh sheet is hung, a vertical reinforced grid steel frame is erected, a temporary inverted arch is erected, the cut-off shaft grid steel frame and the grid steel frame of the small pilot tunnel (102) at the upper part of the first crossover section are welded together, concrete is sprayed, and a support system is sealed.
5. The construction method for setting up a central vertical shaft to construct a large-section crossroad tunnel of a subway according to claim 1, wherein the construction method comprises the following steps: in the third step, when the vertical shaft (111) is excavated to the arch top of the lower step (114) of the transverse channel, an advance support is arranged along the arch top of the lower step (114) of the transverse channel, so that the soil body above the lower step (114) of the transverse channel is ensured to be stable;
when the vertical shaft (111) is excavated to the arch top of the small pilot tunnel (104) at the lower part of the first crossover section, an advance support is arranged along the arch top of the small pilot tunnel (104) at the lower part of the first crossover section, so that the stability of soil above the small pilot tunnel (104) at the lower part of the first crossover section is ensured.
6. The construction method for setting up a central vertical shaft to construct a large-section crossroad tunnel of a subway according to claim 1, wherein the construction method comprises the following steps: in the fourth step, the vertical shaft (111) and the bottom end of the small pilot tunnel (104) at the lower part of the first crossover section are subjected to staggered design; during construction, after the shaft wall of a vertical shaft is broken, a small pilot tunnel (104) at the lower part of the first crossover section is excavated for 3-5 m, a reinforcing mesh is hung, a reinforced grid steel frame is erected, the truncated vertical shaft grid steel frame, the small pilot tunnel (102) at the upper part of the first crossover section and the grid steel frame of the small pilot tunnel (104) at the lower part of the first crossover section are welded together, concrete is sprayed, and a support system is closed.
7. The construction method for setting up a central vertical shaft to construct a large-section crossroad tunnel of a subway according to claim 1, wherein the construction method comprises the following steps: in the fifth step, the vertical shaft (111) and the bottom end of the transverse channel are designed in a staggered way, and the transverse channel breaking construction steps are as follows:
step 5.1, breaking a shaft well wall grating in the range of an upper step at a horse head door, setting a reinforced ring beam in a shaft (111) at the vault and temporary inverted arch positions of a channel when the horse head door is opened by the shaft (111), and setting gussets at four corners of the ring beam;
step 5.2, connecting steel bars are arranged outside the outline of the opening door of the vertical shaft (111) in a sectionalized mode to form a grid steel frame connected in series, so that a hidden beam is formed to ensure the stability of the vertical shaft (111) steel frame when the opening door is opened;
step 5.3, after a footage of one truss is excavated, a reinforcing mesh sheet is hung in time, a truss reinforcing grid steel frame is erected, the truncated vertical shaft grids and the horsehead grid steel frame are welded together, and concrete is sprayed to form a closed support;
step 5.4, closely arranging two reinforced grids in the sequence, and spraying and mixing for supporting;
and 5.5, after the upper step (113) of the transverse channel is forwards applied for 3-5 m, breaking the well wall grating in the range of the lower step (114) of the transverse channel, and quickly constructing the first grating of the lower step to enable the steel grating of the horse door of the transverse channel to form a ring.
8. The construction method for setting up a central vertical shaft to construct a large-section crossroad tunnel of a subway according to claim 7, wherein the construction method comprises the following steps: the horse head door is reinforced by a close-packed grid.
9. The construction method for setting up a central vertical shaft to construct a large-section crossroad tunnel of a subway according to claim 1, wherein the construction method comprises the following steps: in the fifth step, the method further comprises the step of setting up an advance support, and the method comprises the following steps:
an advanced support is arranged on the arch crown part of the cross channel along the crossover section (112) to ensure the stability of soil above the crossover section (112);
and an advanced support is arranged on the transverse channel along the arch top of the standard section, so that the soil body above the standard section is ensured to be stable.
10. The construction method for setting up a central vertical shaft to construct a large-section crossroad tunnel of a subway according to claim 1, wherein the construction method comprises the following steps: in the seventh step, in the process of excavating the cross section inner crossover section (112), the crossover section (112) transits from a large section to a small section, the large section is constructed by adopting a double-side wall pilot tunnel method, and the small section is excavated by adopting a CD method; the concrete process of the double-side wall pilot tunnel method construction excavation is as follows:
step 7.1, taking a small pilot tunnel (102) at the upper part of a first crossover section and a small pilot tunnel (104) at the lower part of the first crossover section in a shaft (111) interval as pilot pits at one side of a crossover section (112);
step 7.2, excavating a small pilot tunnel (107) at the upper part of the second crossover section in the two sections of transverse channels, and closing a supporting system by adopting an initial supporting and temporary middle partition wall of the small pilot tunnel (107) at the upper part of the Shidi second crossover section;
step 7.3, excavating a small pilot tunnel (108) at the lower part of the second crossover section in the two sections of transverse channels, and closing a supporting system by adopting an initial supporting and temporary middle partition wall of the small pilot tunnel (108) at the lower part of the Shidi second crossover section;
7.4, excavating an upper step (109) of a soil body in the middle part, performing primary support, supporting two sides of the primary support on a temporary middle partition wall of a pilot tunnel, performing temporary inverted arch to support on a lower step, and sealing a support system;
7.5, excavating a middle soil body lower step (110), performing primary support, enabling two sides of the primary support to be supported on a temporary middle partition wall of a pilot tunnel, and constructing a bottom primary support as soon as possible, so that the full section is closed;
step 7.6, dismantling the temporary middle partition wall;
and 7.7, building an inner lining, and completing excavation and lining construction of the section tunnel at the crossover.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102155233A (en) * | 2011-04-21 | 2011-08-17 | 上海市城市建设设计研究院 | Tunnel excavation construction method |
| CN106948823A (en) * | 2017-03-15 | 2017-07-14 | 中铁十五局集团有限公司 | Construction method for joint construction of station air duct and underground excavation interval |
| CN208136871U (en) * | 2018-03-13 | 2018-11-23 | 中国电建集团中南勘测设计研究院有限公司 | A kind of free overflow flood-discharge tunnel |
| CN114704263A (en) * | 2022-06-06 | 2022-07-05 | 中国铁路设计集团有限公司 | Method for building large cross section of crossover line by arranging vertical shaft above underground excavation interval of subway |
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- 2023-08-01 CN CN202310952961.1A patent/CN116658167B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102155233A (en) * | 2011-04-21 | 2011-08-17 | 上海市城市建设设计研究院 | Tunnel excavation construction method |
| CN106948823A (en) * | 2017-03-15 | 2017-07-14 | 中铁十五局集团有限公司 | Construction method for joint construction of station air duct and underground excavation interval |
| CN208136871U (en) * | 2018-03-13 | 2018-11-23 | 中国电建集团中南勘测设计研究院有限公司 | A kind of free overflow flood-discharge tunnel |
| CN114704263A (en) * | 2022-06-06 | 2022-07-05 | 中国铁路设计集团有限公司 | Method for building large cross section of crossover line by arranging vertical shaft above underground excavation interval of subway |
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