CN113279693B - Structure for enabling newly built subway tunnel in soft soil body area to transversely penetrate existing tunnel and construction method of structure - Google Patents
Structure for enabling newly built subway tunnel in soft soil body area to transversely penetrate existing tunnel and construction method of structure Download PDFInfo
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- CN113279693B CN113279693B CN202110502702.XA CN202110502702A CN113279693B CN 113279693 B CN113279693 B CN 113279693B CN 202110502702 A CN202110502702 A CN 202110502702A CN 113279693 B CN113279693 B CN 113279693B
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- 239000002689 soil Substances 0.000 title claims abstract description 28
- 238000010276 construction Methods 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 268
- 239000010959 steel Substances 0.000 claims abstract description 268
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000004568 cement Substances 0.000 claims description 30
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 28
- 239000002002 slurry Substances 0.000 claims description 28
- 238000007789 sealing Methods 0.000 claims description 23
- 238000009434 installation Methods 0.000 claims description 8
- 238000005553 drilling Methods 0.000 claims description 7
- 230000005641 tunneling Effects 0.000 claims description 4
- 239000000155 melt Substances 0.000 claims description 3
- 239000011440 grout Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
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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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Structural Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Soil Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention relates to a structure for enabling a newly-built subway tunnel in a soft soil area to cross an existing tunnel, which comprises the existing tunnel, a newly-built subway station, a newly-built subway shield tunnel and a pipe shed formed by steel pipes, wherein the existing tunnel and the newly-built subway shield tunnel are crossed and staggered in the vertical direction, the pipe shed isolates the existing tunnel and the newly-built subway shield tunnel in the vertical direction, one end of a main steel pipe is connected with a ground connecting wall of the newly-built subway station, the other end of the main steel pipe is supported only by a soil body in the area, and the distance exceeding the existing tunnel is more than the width of the existing tunnel. The construction method for the newly built subway tunnel in the soft soil area to traverse the existing tunnel structure comprises the steps of constructing the pipe shed firstly and then constructing the newly built subway tunnel. The method has the advantage of reducing the influence of the newly-built subway shield tunnel on the existing tunnel when the newly-built subway shield tunnel traverses the existing tunnel, and solves the problem of large influence of the newly-built subway tunnel which traverses the existing tunnel on the existing tunnel.
Description
Technical Field
The invention relates to the technical field of buildings, in particular to a structure for enabling a newly built subway tunnel in a soft soil body area to cross an existing tunnel and a construction method thereof.
Background
With the development of underground space receiving more and more attention, the urban rail transit which is the key point of the development of underground space also receives more and more attention. The construction of subway tunnels in cities often meets the condition that newly built subway tunnels cross existing tunnels. The tunnel of the newly built shield subway can inevitably cause the displacement field of the soil body around the tunnel when crossing the existing tunnel, and particularly in the soft soil area, the poor soil body engineering property is more serious. The additional load of the existing tunnel is increased under the action of the soil displacement field, so that serious adverse effects are generated on the tunnel, such as segment cracking, bolt separation, water leakage, longitudinal uneven settlement and the like, and the normal operation of subways in the existing tunnel is influenced.
The method is mainly characterized in that a partition structure is added between a newly-built tunnel and an existing tunnel, and displacement fields possibly caused in the process of shield tunnel tunneling, grouting, supporting and the like are limited through the partition structure, so that the influence of the construction process of the newly-built tunnel on the operating shield tunnel is reduced.
Disclosure of Invention
The invention provides a soft soil area newly-built subway tunnel traversing existing tunnel structure capable of reducing the influence on the existing tunnel when a newly-built subway shield tunnel traverses the existing tunnel, and solves the problem that the influence of a newly-built subway tunnel traversing the existing tunnel on the existing tunnel is large.
The technical problem is solved by the following technical scheme: a new subway tunnel crossing existing tunnel structure of soft soil area, including existing tunnel, new subway station and two new subway shield tunnels communicating with new subway station, the existing tunnel crosses with new subway shield tunnel and staggers along the up-down direction, characterized by, also include the pipe shed located in the crossing of existing tunnel with new subway shield tunnel, the said pipe shed keeps apart and isolates the existing tunnel with new subway shield tunnel along the up-down direction, the said pipe shed includes if along the main steel pipe of the extension direction of new subway shield tunnel, the said main steel pipe intussuseption is filled with and installed in the main steel pipe and injected the main steel pipe portion inner core that the cement grout solidifies after the tunnel of existing tunnel with new subway shield tunnel, one end of the said main steel pipe links together with the diaphragm wall of the said new subway station, another end only supports and exceeds the distance of the existing tunnel by the soil body in the area and is above the width of the existing tunnel, the two ends of the pipe shed along the width direction of the newly-built subway shield tunnel exceed the newly-built subway shield tunnel along the width direction of the newly-built subway shield tunnel. The pipe shed is arranged to be isolated between the existing tunnel and the newly-built tunnel, so that the influence on the existing subway tunnel during the newly-built subway tunnel can be reduced. The main steel pipe is injected with cement slurry to form an inner core, so that the structural drive of the steel pipe can be improved, and the aging speed of the main steel pipe can be delayed. One end of the main steel pipe is used for building a newly-built subway station for supporting, and the displacement resistance effect of the pipe shed can be improved.
Preferably, there are two existing tunnels, and each newly-built subway shield tunnel is isolated from the two existing tunnels through one pipe shed. The convenience in construction can be improved.
Preferably, the main steel pipe is provided with air holes, and the air holes are axially adjacent to each other along the main steel pipe and staggered along the circumferential direction of the main steel pipe. The injection speed and the compactness of the inner core during grouting can be improved, and the influence of the arrangement of the air holes on the strength of the main steel pipe can be reduced.
Preferably, the air holes are tapered holes with small inner ends and large outer ends, the inner core of the main steel pipe part extends into the air holes to form protrusions, tapered plugs for plugging the air holes are poured on the protrusions, and the tapered plugs protrude out of the outer peripheral surface of the main steel pipe. Can prevent the main steel pipe from blocking caused by air holes when the main steel pipe is planted in the soil body. The conical plug is closed in the air hole before grouting, and the conical plug is ejected out after the main steel pipe is implanted, and then grouting is performed.
Preferably, two rows of branch steel pipes are further arranged outside the main steel pipe in a penetrating manner and hooked on the inner circumferential surface of the main steel pipe in a penetrating manner, the branch steel pipes are distributed along the circumferential direction of the main steel pipe, and the main steel pipe portion inner core of each branch steel pipe is provided with a branch steel pipe portion inner core arranged in each branch steel pipe in a penetrating manner; before the main steel pipe forms the inner core of the main steel pipe part, the branch steel pipes can be contracted into the main steel pipe; between two adjacent main steel pipes, the inner core of the branch steel pipe part in the branch steel pipe facing to the other main steel pipe on one main steel pipe is bonded with the inner core of the branch steel pipe part in the branch steel pipe facing to one main steel pipe on the other main steel pipe. Can make each main steel pipe of pipe shed link into an organic whole to improve the anti ability of subsiding of pipe shed.
Preferably, the leg steel pipes facing the other main steel pipe on the one main steel pipe and the leg steel pipes facing the one main steel pipe on the other main steel pipe are further joined together by soldering between the two adjacent main steel pipes.
The invention also provides a construction method for building a subway tunnel in a soft soil area to cross an existing tunnel structure, which is characterized by comprising the following steps of: the method comprises the steps that a newly-built subway station is used as a construction space for drilling a soil body to form a row of main steel pipe mounting holes, a main steel pipe is mounted in each main steel pipe mounting hole, one end of a column steel pipe is connected with a diaphragm wall of the newly-built subway station, the distance of the other end of the column steel pipe, which exceeds an existing tunnel, is more than the width of the existing tunnel, the main steel pipe mounting holes extend along the design extending direction of the newly-built subway shield tunnel, the projection of the first main steel pipe mounting hole along the vertical direction is located on one side of the design position of the newly-built subway shield tunnel, the projection of the last main steel pipe mounting hole along the vertical direction is located on the other side of the design position of the newly-built subway shield tunnel, and all the main steel pipes form a pipe shed; injecting cement slurry into the main steel pipe, and curing the cement slurry to form an inner core of the main steel pipe part filled in the steel pipe; and secondly, tunneling one side of the pipe shed far away from the existing tunnel to form a newly-built subway shield tunnel.
Preferably, the drilling in the first step is performed at intervals, that is, two adjacent main steel pipe installation holes are drilled at intervals, a main steel pipe is installed in the previous main steel pipe installation hole before the next main steel pipe installation hole is drilled, and cement slurry is injected into the previous main steel pipe before the main steel pipe is installed in the next main steel pipe installation hole.
Preferably, adjacent main steel pipes in the first step are connected together by: 1-1, a flexible sealing pipe is arranged in a main steel pipe; 2-2, inflating the flexible sealing pipe to bulge, and ejecting a main steel pipe out of a main steel pipe part support steel pipe, which is contracted into a main steel pipe and provided with a main steel pipe part tin cover at the outer end, when the flexible sealing pipe bulges; 1-3, taking out the flexible sealing pipe; 1-4, injecting cement slurry into a main steel pipe, wherein the cement slurry is cured in the main steel pipe to form a main steel pipe part inner core, and the cement slurry is cured in a main steel pipe part branch steel pipe to form a main steel pipe part branch steel pipe part inner core; 1-5, arranging a flexible sealing pipe in the other main steel pipe; 1-6, inflating the flexible sealing pipe to bulge, and ejecting the other branch steel pipe, which is provided with the other branch steel pipe part tin cover at the outer end contracted in the other branch steel pipe, out to the other branch steel pipe part tin cover to abut against the same main steel pipe part tin cover; 1-7, taking out the flexible sealing pipe; 1-8, connecting the other main steel pipe and one main steel pipe with two poles of a power supply respectively to electrify and blow air into the other main steel pipe at the same time, wherein the current of the power supply melts the tin cover of one main steel pipe part and the tin cover of the other main steel pipe part, and the blown air blows the tin cover of one main steel pipe part and the tin cover of the other main steel pipe part in a molten state out of a cavity so that the inner core of one main steel pipe part branch steel pipe part is exposed in the inner space of the other main steel pipe part branch steel pipe; and 1-9, injecting cement slurry into the other main steel pipe, curing the cement slurry in the other main steel pipe to form the inner core of the other main steel pipe part, and forming the inner core of the other main steel pipe part and the inner core of the same main steel pipe part and the other branch steel pipe part which are bonded together in the other main steel pipe part and the other branch steel pipe part. The inner cores of the main steel pipes can be connected together without opening the outer soil body.
Preferably, the gas in the 1-8 flows out from the air holes on the other main steel pipe to form a pit in the soil body, and the cement slurry injected in the 1-9 also flows into the pit to form a balance wing. The anti-sinking effect is good.
The invention has the following advantages: the influence of the existing tunnel of the newly-built subway shield tunnel team can be effectively reduced.
Drawings
Fig. 1 is a top view of a first embodiment of the present invention.
Fig. 2 is a cross-sectional view of a first embodiment of the present invention.
Fig. 3 is a schematic cross-sectional view of a main steel pipe in a second embodiment of the present invention.
Fig. 4 is a schematic view of the second embodiment in which two adjacent main steel pipes are constructed and only one main steel pipe is grouted.
Fig. 5 is a schematic view of two adjacent main steel pipes in the second embodiment after completion of construction.
In the figure: the novel subway shield tunnel comprises an existing tunnel 1, a newly-built subway station 2, a newly-built subway shield tunnel 3, a pipe shed 4, air holes 6, a conical plug 7, a branch steel pipe 8, a hook head 9, a tin cover 10, a main steel pipe 11, a main steel pipe part branch steel pipe 12, a main steel pipe part inner core 13, a main steel pipe part branch steel pipe part inner core 14, another main steel pipe 15, another part branch steel pipe 16, another branch steel pipe part tin cover 17, a main steel pipe part tin cover 18, another main steel pipe part inner core 19, another main steel pipe part branch steel pipe inner core 20 and balance wings 21.
Detailed Description
The invention is further described with reference to the following figures and examples.
First embodiment, referring to fig. 1 and 2, a new subway tunnel in a soft soil area traverses an existing tunnel structure, and comprises an existing tunnel 1, a new subway station 2 and two new subway shield tunnels 3 communicated with the new subway station. The existing tunnel and the newly-built subway shield tunnel are crossed and staggered in the vertical direction. And the pipe shed 4 at the intersection of the existing tunnel and the newly-built subway shield tunnel. The pipe shed isolates the existing tunnel from the newly-built subway shield tunnel along the up-down direction. Existing tunnels have two, and each newly-built subway shield tunnel is respectively kept apart with two existing tunnels through a pipe shed. The pipe shed comprises a plurality of main steel pipes 5 extending along the extending direction of the newly-built subway shield tunnel. The main steel pipe is provided with air holes which are adjacent along the axial direction of the main steel pipe, and the air holes are staggered along the circumferential direction of the main steel pipe. The main steel pipe is internally filled with an inner core of a main steel pipe part which is formed by injecting cement slurry and solidifying after the main steel pipe is arranged between the existing tunnel and the newly-built subway shield tunnel. One end of the main steel pipe is connected with a diaphragm wall of the newly-built subway station, and the other end of the main steel pipe is supported only by regional soil and exceeds the existing tunnel far away from the newly-built subway station in the existing tunnel by more than the width of the existing tunnel. The two ends of the pipe shed along the width direction of the newly-built subway shield tunnel exceed the newly-built subway shield tunnel along the width direction of the newly-built subway shield tunnel. The horizontal distance between adjacent main steel pipes is 350 mm.
The construction method for the newly built subway tunnel in the soft soil body area to traverse the existing tunnel structure comprises the following steps: the first step, preparation pipe canopy, the concrete process of preparation pipe canopy does: the method comprises the steps that a newly-built subway station is used as a construction space for drilling a soil body to form a row of main steel pipe mounting holes, a main steel pipe is mounted in each main steel pipe mounting hole, one end of a column steel pipe is connected with a diaphragm wall of the newly-built subway station, the distance of the other end of the column steel pipe, which exceeds an existing tunnel, is more than the width of the existing tunnel, the main steel pipe mounting holes extend along the design extending direction of the newly-built subway shield tunnel, the projection of the first main steel pipe mounting hole along the vertical direction is located on one side of the design position of the newly-built subway shield tunnel, the projection of the last main steel pipe mounting hole along the vertical direction is located on the other side of the design position of the newly-built subway shield tunnel, and all the main steel pipes form a pipe shed; injecting cement slurry into the main steel pipe, and solidifying the cement slurry to form an inner core of the main steel pipe part filled in the steel pipe; and secondly, tunneling one side of the pipe shed far away from the existing tunnel to form a newly-built subway shield tunnel. The method comprises the following steps of drilling holes at first step, namely, drilling two adjacent main steel pipe mounting holes at intervals, installing a main steel pipe in an upper main steel pipe mounting hole before drilling a next main steel pipe mounting hole, and injecting cement slurry into the upper main steel pipe before installing the main steel pipe in the next main steel pipe mounting hole.
The embodiment is different from the first embodiment in that:
referring to fig. 3, the air holes 6 on the main steel pipe are tapered holes with small inner ends and large outer ends. The inner cover of the air hole is provided with a conical plug 7. The inner end of the conical plug extends into the main steel pipe.
And branch steel pipes 8 are also arranged on two sides of the main steel pipe. The branch steel pipe is arranged on the wall of the main steel pipe in a penetrating way. The inner end of the branch steel pipe is provided with a hook head 9. The branch steel pipe can be contracted in the main steel pipe. The outer end of the branch steel pipe is provided with a tin cover 10 to seal.
In the first step, adjacent main steel pipes are connected together through the following steps:
referring to fig. 4, 1-1, a flexible sealed tube is filled in a main steel 11; 2-2, inflating the flexible sealing pipe to bulge, and ejecting a main steel pipe part support steel pipe 12 contracted in a main steel pipe and a conical plug 7 on the main steel pipe out of the main steel pipe when the flexible sealing pipe bulges; 1-3, taking out the flexible sealing pipe; and 1-4, injecting cement slurry into one main steel pipe, curing the cement slurry in the main steel pipe to form a main steel pipe part inner core 13, and curing the cement slurry in a main steel pipe part branch steel pipe to form a main steel pipe part branch steel pipe part inner core 14.
Referring to fig. 5, 1-5, a flexible sealing pipe is arranged in the other main steel pipe 15; 1-6, inflating the flexible sealing pipe to bulge, ejecting another branch steel pipe 16 contracted in another branch steel pipe to the tin cover 17 of another branch steel pipe, wherein the tin cover 18 of the same branch steel pipe is abutted to each other when the flexible sealing pipe bulges, and the conical plug 7 on the other branch steel pipe is already ejected; 1-7, taking out the flexible sealing pipe; 1-8, connecting the other main steel pipe and one main steel pipe with two poles of a power supply respectively to electrify and simultaneously blow air to the other main steel pipe 15, wherein during air blowing, airflow flows out from air holes on the other main steel pipe to form pits in soil and further blow off the plugs, the current of the power supply melts the tin cover of one main steel pipe part and the tin cover of the other main steel pipe part, and the blown-in gas blows out the tin cover of one main steel pipe part and the tin cover of the other main steel pipe part in a molten state to form a cavity so that the inner core of one main steel pipe part branch steel pipe part is exposed in the inner space of the other main steel pipe part branch steel pipe; 1-9, injecting cement slurry into the other main steel pipe, solidifying the cement slurry in the other main steel pipe to form the other main steel pipe portion inner core 19, forming the other main steel pipe portion inner core 20 in the other main steel pipe portion branch steel pipe, wherein the same main steel pipe portion inner core is bonded together, and the injected cement slurry also flows into the concave pit to be connected with the conical plug to form a balance wing 21. And after the tin is solidified, welding the other part of the branch steel pipe and one part of the branch steel pipe together with the tin.
Claims (3)
1. A construction method for a newly built subway tunnel in a soft soil area to cross an existing tunnel structure is characterized by comprising the following steps of firstly, manufacturing a pipe shed, wherein the concrete process of manufacturing the pipe shed is as follows: the method comprises the steps that a newly-built subway station is used as a construction space to drill a soil body to form a row of main steel pipe mounting holes, a main steel pipe is mounted in each main steel pipe mounting hole, one end of a column steel pipe is connected with a ground connecting wall of the newly-built subway station, the distance that the other end of the column steel pipe exceeds an existing tunnel is more than the width of the existing tunnel, the main steel pipe mounting holes extend along the design extending direction of the newly-built subway shield tunnel, the projection of the first main steel pipe mounting hole along the vertical direction is located on one side of the design position of the newly-built subway shield tunnel, the projection of the last main steel pipe mounting hole along the vertical direction is located on the other side of the design position of the newly-built subway shield tunnel, and all the main steel pipes form a pipe shed; injecting cement slurry into the main steel pipe, and solidifying the cement slurry to form an inner core of the main steel pipe part filled in the steel pipe; secondly, tunneling at one side of the pipe shed far away from the existing tunnel to form a newly-built subway shield tunnel; in the first step, adjacent main steel pipes are connected together through the following steps: 1-1, a flexible sealing pipe is arranged in a main steel pipe; 1-2, inflating the flexible sealing pipe to bulge, and ejecting a main steel pipe out of a main steel pipe part support steel pipe, wherein the outer end of the flexible sealing pipe contracted in the main steel pipe is provided with a main steel pipe part tin cover, when the flexible sealing pipe bulges; 1-3, taking out the flexible sealing pipe; 1-4, injecting cement slurry into a main steel pipe, wherein the cement slurry is cured in the main steel pipe to form a main steel pipe part inner core, and the cement slurry is cured in a main steel pipe part branch steel pipe to form a main steel pipe part branch steel pipe part inner core; 1-5, arranging a flexible sealing pipe in the other main steel pipe; 1-6, inflating the flexible sealing pipe to bulge, and ejecting out another branch steel pipe, which is contracted in the other branch steel pipe and provided with another branch steel pipe part tin cover at the outer end, to the other branch steel pipe part tin cover, wherein the same branch steel pipe part tin cover is abutted together when the flexible sealing pipe bulges; 1-7, taking out the flexible sealing pipe; 1-8, connecting the other main steel pipe and one main steel pipe with two poles of a power supply respectively to electrify and blow air into the other main steel pipe at the same time, wherein the current of the power supply melts the tin cover of one main steel pipe part and the tin cover of the other main steel pipe part, and the blown air blows the tin cover of one main steel pipe part and the tin cover of the other main steel pipe part in a molten state out of a cavity so that the inner core of one main steel pipe part branch steel pipe part is exposed in the inner space of the other main steel pipe part branch steel pipe; and 1-9, injecting cement slurry into the other main steel pipe, curing the cement slurry in the other main steel pipe to form the inner core of the other main steel pipe part, and forming the inner core of the other main steel pipe part and the inner core of the same main steel pipe part and the other branch steel pipe part which are bonded together in the other main steel pipe part and the other branch steel pipe part.
2. The construction method of a soft soil zone newly built subway tunnel traversing the existing tunnel structure according to claim 1, characterized in that the drilling in the first step is performed at intervals, i.e. two adjacent main steel pipe installation holes are drilled at intervals, the main steel pipe is installed in the previous main steel pipe installation hole before the next main steel pipe installation hole is drilled, and cement slurry is injected into the previous main steel pipe before the main steel pipe is installed in the next main steel pipe installation hole.
3. The construction method of the new built subway tunnel in the soft soil area crossing the existing tunnel structure according to claim 1, characterized in that the gas in 1-8 flows out from the air holes on the other main steel pipe to form a pit in the soil body, and the cement grout injected in 1-9 flows into the pit to form a balance wing.
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| CN202110502702.XA CN113279693B (en) | 2021-05-09 | 2021-05-09 | Structure for enabling newly built subway tunnel in soft soil body area to transversely penetrate existing tunnel and construction method of structure |
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| CN202110502702.XA CN113279693B (en) | 2021-05-09 | 2021-05-09 | Structure for enabling newly built subway tunnel in soft soil body area to transversely penetrate existing tunnel and construction method of structure |
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| CN107916935A (en) * | 2017-11-13 | 2018-04-17 | 浙江大学城市学院 | A kind of soil body composite reinforcing structure and construction method of the existing subway of weak soil shield crossing |
| CN109488314A (en) * | 2018-12-30 | 2019-03-19 | 中铁十四局集团有限公司 | Pipe curtain construction method |
| CN209444350U (en) * | 2019-01-07 | 2019-09-27 | 中铁十一局集团城市轨道工程有限公司 | Shield launching wears existing shield tunnel barrel vault advanced support structure under being |
| CN110344842A (en) * | 2019-07-30 | 2019-10-18 | 中铁九局集团第七工程有限公司 | Main traffic road pipe curtain construction is worn under Subway tunnel |
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| CN113279693A (en) | 2021-08-20 |
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