CN211038701U - Mine method subway interval air shaft with shield first and well second - Google Patents
Mine method subway interval air shaft with shield first and well second Download PDFInfo
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- CN211038701U CN211038701U CN201921331374.6U CN201921331374U CN211038701U CN 211038701 U CN211038701 U CN 211038701U CN 201921331374 U CN201921331374 U CN 201921331374U CN 211038701 U CN211038701 U CN 211038701U
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Abstract
The utility model relates to a 'shield first and well last' mine method subway interval air shaft, which comprises a mine method air duct and an open cut air shaft; the mine method air duct is arranged transversely perpendicular to the shield tunnel, and is longitudinally connected with shield segments in front and at back; the open cut air shaft is positioned on one side of the shield tunnel, one transverse end of the mine method air channel is closed, the other transverse end of the mine method air channel is connected into the open cut air shaft, and the top of the outer side of the open cut air shaft is provided with the air shaft which is communicated with the ground line. The utility model discloses open cut the air shaft for "in the open ground of positive line one side with the design of subway tunnel air shaft + with the two-layer wind channel of the mine method of positive line quadrature", open cut air shaft and positive line shield tunnel are accomplished in the elder generation construction, backfill in the shield tunnel and consolidate the back and simulate the normal tunnelling country rock in mine method wind channel and pass through the shield tunnel scope, solve the problem that the pipeline that subway tunnel air shaft open cut in the positive line scope brought changes, traffic is dredged the scheduling problem and shield tunnel time limit for a project.
Description
Technical Field
The utility model belongs to the technical field of subway shield tunnel, concretely relates to mine method subway interval ventilating shaft of "well behind shield earlier".
Background
In the long and large interval of subway engineering, an interval air shaft needs to be arranged at a proper position in the middle of the interval due to the functional requirement of piston wind.
Subway projects are generally located in downtown areas, and have the characteristics of large specific pedestrian flow and dense traffic flow, and the air shaft projects between the subway sections are generally constructed by an open excavation method with short construction period, low construction cost and low safety risk, and the works such as traffic fluffing, pipeline moving and changing, stratum reinforcement and the like are required during the construction period, so that the social influence is great during the construction period.
In addition, the subway shield tunnel of the air shaft in the middle of the conventional arrangement interval is constructed in such a way that the shield is pushed through the structure of the air shaft in the interval in an empty mode after the construction of the air shaft in the interval is completed. Or adopt utility model patent "collapsible loess combines the air shaft that cobble soil stratum undercut wind channel connects shield tunnel" scheme, also can carry out the shield tunnel tunnelling in the construction completion rear of mine method wind channel, and the time limit for a project to positive line shield method tunnel is very big. If the construction period is short, the shield tunnel is required to be tunneled, and after the shield tunnel is communicated, the mine method is adopted to carry out interval air shaft construction.
Disclosure of Invention
The utility model aims at providing an interval ventilating shaft of mine method subway and construction method of "first shield well back" has solved the interval ventilating shaft of subway that exists among the prior art and has generally adopted the open cut method construction, leads to interval ventilating shaft engineering plane scale big, traffic is dredged, the pipeline moves and changes to enclose that the fender area of occupation is big and ground encloses the fender and take time long scheduling problem.
The utility model discloses the technical scheme who adopts does:
the utility model provides a mine method subway interval air shaft of "shield well after first", its characterized in that:
comprises a mine method air duct and an open cut air shaft;
the mine method air duct is arranged perpendicular to the shield tunnel in the transverse direction, and the longitudinal front and back of the line are connected with shield segments;
the open cut air shaft is positioned on one side of the shield tunnel, one transverse end of the mine method air channel is closed, the other transverse end of the mine method air channel is connected into the open cut air shaft, and the top of the outer side of the open cut air shaft is provided with the air shaft which is communicated with the ground line.
The mine method air duct comprises a bottom plate, an end wall at the closed end, longitudinal front and rear side walls and a vault at the top, the interior of the mine method air duct is divided into a double-layer structure by a middle plate, all layers of structures are communicated, and a shield tunnel is communicated with a lower layer structure of the mine method air duct.
The open cut air shaft comprises supporting piles on the periphery and side walls in the supporting piles, a bottom plate is arranged at the bottom, a top plate is arranged at the top, the interior of the open cut air shaft is divided into a three-layer structure by a middle plate, all the layers of structures are communicated, the third layer is in butt joint with the lower layer of the mine method air channel, and the second layer is in butt joint with the upper layer of the mine method air channel.
The third layer of the open cut air shaft extends outwards, and the top of the open cut air shaft is connected with a vertical air shaft.
A top longitudinal beam is arranged on the bottom surface of a top plate in the open cut air shaft, and a column is arranged below the top longitudinal beam to serve as a support;
a middle longitudinal beam is arranged on the bottom surface of each layer of middle plate in the open cut air shaft, and a column is arranged below the middle longitudinal beam to serve as a support;
and the top surface of the bottom plate in the open-cut air shaft is provided with a bottom longitudinal beam, and the bottom of the column is arranged on the top surface of the bottom longitudinal beam.
And the joints of the mine method air duct and the open cut air shaft and the joints of the open cut air shaft and the third layer of extension sections are provided with annular deformation joints.
And a crown beam is arranged at the pile top of the supporting pile.
The shield segment is provided with an early-stage ring beam and a shield post-pouring ring beam at the position where the shield segment is connected into the air duct of the mine method.
And a stainless steel water receiving tank is arranged at the joint of the shield segment and the shield post-cast ring beam.
The utility model has the advantages of it is following:
the utility model discloses be "two-layer wind channel of mine method of open cut air shaft + and positive line quadrature in the open cut air shaft on one side of the positive line" with subway tunnel air shaft design. The construction is firstly completed, the open cut air shaft and the main line shield tunnel are constructed, and the normal tunneling of surrounding rocks through the range of the shield tunnel by the mine method is simulated after the shield tunnel is backfilled and reinforced. The novel technology solves the problems of pipeline moving and changing, traffic untwining and the like caused by open excavation of the subway tunnel air shaft in the normal line range and the problem of construction period restriction of the shield tunnel.
Furthermore, the utility model mainly aims at major risks such as flexible connection between shield tunnel segments which are constructed and have poor anti-deformation capability, upward floating of the shield segments caused by later excavation of the mine method air duct, horizontal displacement influenced by bias voltage and the like; and the bottoms of the steel frames at two sides of the primary support of the air duct in the post-construction mining method are positioned above the shield segments, so that risks such as local damage of the shield segments can be caused, and an in-tunnel backfill reinforcing measure is taken for the shield tunnel which is constructed in the early stage.
Drawings
Fig. 1 is a schematic structural plan view of the present invention.
Fig. 2 is a schematic longitudinal section (a-a section) of the structure of the present invention.
Fig. 3 is a schematic cross-sectional view (B-B cross section) of the mine method duct of the present invention.
Fig. 4 is a construction process diagram (1, 2, 3 … … show excavation and support, v, vi, vii … … show two lining construction processes).
FIG. 5 is a plan view of a shield segment mortar backfill reinforcing structure.
FIG. 6 is a section view of mortar backfill and reinforcement of shield segments.
Fig. 7 is a shield segment steel frame reinforced plan view.
Fig. 8 is a reinforced section view of a shield segment steel frame.
Fig. 9 is a reinforced section view of a shield segment steel frame.
FIG. 10 is a plan view of a shield tunnel and mine method air duct interface stratum reinforcement.
FIG. 11 is a cross-sectional view of a shield tunnel and mine method air duct interface stratum reinforcement.
Fig. 12 is a plan layout view of the shield tunnel and mine method air duct interface structure.
Fig. 13 is a sectional view of a shield tunnel and mine method air duct interface structure.
Fig. 14 is a rough drawing of a shield tunnel and mine method air duct interface.
Fig. 15 is a schematic diagram of a shield tunnel and mine air duct interface construction process (in the construction process, fig. 1 and 2 … … show a pouring sequence, and IV … … shows a dismantling sequence).
In the figure, 1-support pile, 2-side wall, 3-open cut wind shaft, 4-bottom longitudinal beam, 5-column, 6-primary support, 7-secondary lining, 8-shield segment, 9-mine air duct, 10-deformation joint, 11-crown beam, 12-top plate, 13-top longitudinal beam, 14-middle plate, 15-middle longitudinal beam, 16-bottom plate, 17-wind shaft, 18-middle partition wall, 19-end wall, 20-large pipe shed, 21-advanced grouting small pipe, 22-construction joint, 23-cross brace, 24-back brace, 25-blocking wall, 26-mortar backfill, 27-section steel support, 28-in-hole grouting reinforcement, 29-shield post-pouring ring beam, 30-early stage ring beam, 31-single ring segment, 32-water swelling water stop, 33-portal connecting bolt, 34-grouting pipe and 35-stainless steel water receiving tank.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The utility model relates to a 'shield first and well last' mine method subway interval air shaft, which comprises a mine method air duct 9 and an open cut air shaft 3; the mine method air duct 9 is arranged transversely perpendicular to the shield tunnel, and is longitudinally connected with shield segments 8 in front and at back; the open cut air shaft 3 is positioned at one side of the shield tunnel, one transverse end of the mine method air channel 9 is closed, the other transverse end of the mine method air channel is connected into the open cut air shaft 3, and the top of the outer side of the open cut air shaft 3 is provided with an air shaft 17 which leads to the ground line.
The mine method air duct 9 comprises a bottom plate 16, a closed end wall 19, longitudinal front and rear side walls 2 and a top vault, the interior of the mine method air duct is divided into a double-layer structure by a middle plate 14, all the layers of structures are communicated, and a shield tunnel corresponds to a lower layer structure.
The open cut air shaft 3 comprises supporting piles 1 on the periphery and side walls 2 in the supporting piles 1, a bottom plate 16 is arranged at the bottom, a top plate 12 is arranged at the top, the interior of the open cut air shaft is divided into three layers by a middle plate 14, all the layers are communicated in structure, the first layer is in butt joint with the lower layer of the mine method air channel 9, and the second layer is in butt joint with the upper layer of the mine method air channel 9. The third layer of the open cut air shaft 3 extends outwards, and the top of the open cut air shaft is connected with a vertical air shaft 17. A top longitudinal beam 13 is arranged on the bottom surface of a top plate in the open cut air shaft 3, and a column 5 is arranged below the top longitudinal beam 13 for supporting; the bottom surfaces of middle plates 14 in all layers in the open cut air shaft 3 are provided with middle longitudinal beams 15, and columns 5 are arranged below the middle longitudinal beams 15 for supporting; the top surface of the bottom plate in the open cut air shaft 3 is provided with a bottom longitudinal beam 4, and the bottom of the column 5 is arranged on the top surface of the bottom longitudinal beam 4. The top of the support pile 1 is provided with a crown beam 11.
The joints of the mine method air duct 9 and the open cut air shaft 3 and the joints of the open cut air shaft 3 and the third layer extension section are provided with annular deformation joints 10. And a shield ring beam 29 is arranged at the position where the shield segment 8 is connected into the mine method air duct 9. And a stainless steel water receiving tank 35 is arranged at the joint of the shield segment 8 and the shield ring beam 29.
Overall deployment of construction:
1) after construction precipitation reaches 1m below the bottom plate, carrying out open cut foundation pit layer by layer support and excavation to the bottom of the pit, and excavating to the elevation position of the pipe shed to arrange a large pipe shed;
2) constructing a main body structure of the open cut part, constructing to a middle plate of an underground layer from bottom to top in sequence, and dismantling steel supports on the upper parts of the corresponding plates;
3) and after the tunnel of the shield method tunnel is communicated, backfilling and reinforcing the shield segments in the air duct range by adopting low-grade mortar from the shield method tunnel.
4) After the detection, after the strength of the backfilling mortar reaches the design requirement, sequentially breaking the retaining piles at the air duct opening of the mining method in steps from top to bottom according to the footage of the upper step;
5) the method comprises the steps of entering a hole from top to bottom, excavating an air duct by a mine method, constructing a primary support and a cross brace, vertically chiseling shield segments and backfilling mortar from top to bottom when excavating to expose shield segments of the third step and the fourth step, strictly controlling the circular feed ruler for chiseling the segments and the mortar, and performing chiseling on the segments and the mortar within the range of the next steel frame after timely erecting and spraying the steel frame by one steel frame.
6) After all the primary supports are finished, constructing a mine method air duct secondary lining structure (reserving an opening for constructing a prior ring beam) comprising a middle plate structure in a transverse passage;
7) constructing a shield tunnel and mine air duct interface structure (a shield ring beam part);
8) and (4) dismantling longitudinal reinforcing steel frames at two sides of the mine method air duct along the shield tunnel.
9) The internal partition wall of the air shaft in the construction interval, the stair, the sandwich plate and other internal structures.
Controlling construction difficulty:
1. backfilling by adopting low-grade mortar in the range of the air duct of the finished shield tunnel mining method
1.1 purpose of backfilling mortar
Flexible connection is adopted between the segments of the constructed shield tunnel, the deformation resistance is poor, the shield segments float upwards due to later excavation of a transverse channel by a mine method, horizontal displacement is influenced by bias voltage, and other major risks are caused; the bottom of steel frames at two sides of a primary support of a transverse channel of a post-construction mine method is positioned above shield segments, so that risks such as local damage of the shield segments can be caused, and in-tunnel backfill reinforcing measures are taken for shield tunnels which are constructed in advance.
1.2 mortar backfill scheme
After the shield tunnel construction is communicated, in the shield tunnel, two sides of the mine method air duct are provided with isolation walls with the wall thickness of 500mm, and the shield tunnel is of a reinforced concrete structure. The specific position of the partition wall is that the initial branch excavation contour line of the underground excavation transverse passage deviates 200mm outwards.
Before the isolation wall is poured, a hole not smaller than 300mm in diameter needs to be reserved at the top (12 points) of each isolation wall, the length of the embedded pipe is larger than the thickness of the isolation wall, the embedded pipe is firmly fixed with the isolation wall, and the embedded pipe is used as a reserved opening for backfilling low-grade mortar in a shield tunnel in a transverse channel to ensure dense backfilling.
2. The shield segment is reinforced by a section steel frame
2.1 shield segment section steel reinforcing purpose
The excavation of back construction mine method wind channel probably leads to the section of jurisdiction of the adjacent certain limit in both sides to warp, the utility model discloses a shaped steel steelframe carries out interim reinforcement to the shield that the construction was accomplished section of jurisdiction.
2.2 section steel frame reinforcing scheme
The protection and reinforcement design of shield segments on two sides of an air duct by a mining method is characterized in that before a first step and a second step full-face grouting is performed to reinforce a stratum, I20b steel frames are adopted to reinforce the existing shield segments. And (4) after all the shield tunnels and the mine method transverse channel interface post-cast ring beam are constructed, the supporting steel frame can be disassembled after the design strength is reached.
3. Shield tunnel and mine method air duct interface stratum reinforcing design
According to the arrangement of construction deployment, the shield tunnel and the mine method air duct interface are subjected to interface ring beam construction after the whole shield tunnel and mine method air duct construction is finished.
At this time, the loose tube pieces retained by the shield tube pieces removed in the excavation stage of the mine method air duct are removed, the loose tube pieces need to be removed longitudinally along the shield tunnel in the mine method air duct, and the exposed soil body appears during the removal.
To this risk, the utility model discloses the safety during construction is guaranteed to the scheme of trying to adopt the stratum to consolidate and combine the leading little pipe of vault to strut.
4. Shield tunnel and mine method air duct interface structural design
The duct piece typesetting and positioning are based on-site actual measurement, when the shield tunnel and the mine method air duct joint is constructed, the scattered ring duct pieces are chiseled to the whole ring circumferential seams, and then the shield ring beam is integrally cast in situ and connected with the whole ring shield duct pieces on the two sides of the mine method air duct.
The content of the present invention is not limited to the examples, and any equivalent transformation adopted by the technical solution of the present invention is covered by the claims of the present invention by those skilled in the art through reading the present invention.
Claims (7)
1. The utility model provides a mine method subway interval air shaft of "shield well after first", its characterized in that:
comprises a mine method air duct (9) and an open cut air shaft (3);
the mine method air duct (9) is arranged transversely perpendicular to the shield tunnel, and the longitudinal front and back of the line are connected with shield segments (8);
the open cut air shaft (3) is positioned at one side of the shield tunnel, one transverse end of the mine method air channel (9) is closed, the other transverse end of the mine method air channel is connected into the open cut air shaft (3), and the top of the outer side of the open cut air shaft (3) is provided with an air shaft (17) which leads to the ground line;
the mine method air duct (9) comprises a bottom plate (16), a closed end wall (19), longitudinal front and rear side walls (2) and a top vault, the interior of the mine method air duct is divided into a double-layer structure by a middle plate (14), all layers of structures are communicated, and a shield tunnel is communicated with a lower layer structure of the mine method air duct; the vault comprises a primary support (6) and a secondary lining (7), and a large pipe shed (20) and a small advanced grouting pipe (21) are arranged on the outer side of the vault; a cross brace (23) is arranged between the side walls (2) at the front and the rear of the mine method air duct (9) in the longitudinal direction, and a back brace (24) is arranged below the cross brace (23); partition walls, namely plugging walls (25), are arranged in the shield tunnel and on two sides of the mine method air duct (9);
the open cut air shaft (3) comprises supporting piles (1) on the periphery and side walls (2) in the supporting piles (1), a bottom plate (16) is arranged at the bottom, a top plate (12) is arranged at the top, the interior of the open cut air shaft is divided into three layers by a middle plate (14), the three layers are communicated with each other, the third layer is in butt joint with the lower layer of the mine method air channel (9), and the second layer is in butt joint with the upper layer of the mine method air channel (9).
2. The mine-method subway interval air shaft with a shield-well-after-mine method according to claim 1, wherein:
the third layer of the open cut air shaft (3) extends outwards, and the top of the open cut air shaft is connected with a vertical air shaft (17).
3. The mine-method subway interval air shaft with a shield-well-after-mine method according to claim 2, wherein:
a top longitudinal beam (13) is arranged on the bottom surface of a top plate in the open cut air shaft (3), and a column (5) is arranged below the top longitudinal beam (13) for supporting;
a middle longitudinal beam (15) is arranged on the bottom surface of each layer of middle plates (14) in the open cut air shaft (3), and a column (5) is arranged below the middle longitudinal beam (15) for supporting;
the top surface of a bottom plate in the open cut air shaft (3) is provided with a bottom longitudinal beam (4), and the bottom of the column (5) is arranged on the top surface of the bottom longitudinal beam (4).
4. The mine-method subway interval air shaft with a shield-well-after-mine method according to claim 3, wherein:
the joints of the mine method air duct (9) and the open cut air shaft (3) and the joints of the open cut air shaft (3) and the third layer of extension section are provided with annular deformation joints (10).
5. The 'shield-well-after-mine' mine method subway interval air shaft according to claim 4, wherein:
the top of the support pile (1) is provided with a crown beam (11).
6. The 'shield-well-after-mine' mine method subway interval air shaft according to claim 5, characterized in that:
an early-stage ring beam (30) and a shield post-pouring ring beam (29) are arranged at the position where the shield segment (8) is connected into the mine method air duct (9).
7. The mine-method subway interval air shaft with a shield-well-after-mine method according to claim 6, wherein:
and a stainless steel water receiving tank (35) is arranged at the joint of the shield segment (8) and the shield post-cast ring beam (29).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921331374.6U CN211038701U (en) | 2019-08-16 | 2019-08-16 | Mine method subway interval air shaft with shield first and well second |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921331374.6U CN211038701U (en) | 2019-08-16 | 2019-08-16 | Mine method subway interval air shaft with shield first and well second |
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| Publication Number | Publication Date |
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| CN211038701U true CN211038701U (en) | 2020-07-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921331374.6U Active CN211038701U (en) | 2019-08-16 | 2019-08-16 | Mine method subway interval air shaft with shield first and well second |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110374657A (en) * | 2019-08-16 | 2019-10-25 | 中铁西安勘察设计研究院有限责任公司 | The Mining Method Subway Tunnel ventilating shaft and its construction method of " well after first shield " |
| CN112049650A (en) * | 2020-09-16 | 2020-12-08 | 中国铁路设计集团有限公司 | Method for expanding and excavating existing small shield tunnel by using large shield |
-
2019
- 2019-08-16 CN CN201921331374.6U patent/CN211038701U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110374657A (en) * | 2019-08-16 | 2019-10-25 | 中铁西安勘察设计研究院有限责任公司 | The Mining Method Subway Tunnel ventilating shaft and its construction method of " well after first shield " |
| CN112049650A (en) * | 2020-09-16 | 2020-12-08 | 中国铁路设计集团有限公司 | Method for expanding and excavating existing small shield tunnel by using large shield |
| CN112049650B (en) * | 2020-09-16 | 2022-07-15 | 中国铁路设计集团有限公司 | Method for expanding and excavating existing small shield tunnel by using large shield |
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