CN115354667A - Protection method for super-close distance implementation open excavation and overpass structure of subway shield in liquefied soil - Google Patents
Protection method for super-close distance implementation open excavation and overpass structure of subway shield in liquefied soil Download PDFInfo
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- CN115354667A CN115354667A CN202211077708.8A CN202211077708A CN115354667A CN 115354667 A CN115354667 A CN 115354667A CN 202211077708 A CN202211077708 A CN 202211077708A CN 115354667 A CN115354667 A CN 115354667A
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- Prior art keywords
- mjs
- shield
- steel pipe
- liquefied soil
- pipe curtain
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000002689 soil Substances 0.000 title claims abstract description 20
- 238000009412 basement excavation Methods 0.000 title claims abstract description 5
- 238000010276 construction Methods 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 20
- 239000010959 steel Substances 0.000 claims description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 18
- 230000002787 reinforcement Effects 0.000 claims description 14
- 230000003014 reinforcing effect Effects 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 239000004568 cement Substances 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
-
- 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
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/226—Protecting piles
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention discloses a method for protecting an open excavation and overpass structure implemented by an underground railway shield in liquefied soil at an ultra-short distance, which provides an implementation method capable of controlling the deformation of the existing shield in a soft liquefied soil layer extremely sensitive to construction vibration and meeting the safety of an operated subway track, and is a safe and reliable shield protection method with multiple technical combinations.
Description
Technical Field
The invention belongs to the technical field of underground building construction, and particularly relates to a method for protecting an open cut and overpass structure implemented in ultra-close distance by an iron shield in liquefied soil.
Background
With the development of cities, underground rail transit has become a common public transportation measure in each big city. With the further advance of urban construction, the situation that underground buildings such as newly built tunnels, sunken squares and the like are implemented above the operated subway shield is more and more frequent. In the existing similar cases, the newly-built underground structure is generally far away from the existing shield or has better geological condition, and the implementation of the newly-built underground structure in a super-close distance (the nearest distance is not more than 2 m) above the shield in a soft liquefied soil layer is extremely rare in China. Under the condition, the safety of the subway in operation cannot be ensured by adopting a conventional protection method, and the safety requirement of ultra-close construction above the subway shield under the extremely poor geological condition can be effectively met by adopting a three-in-one multi-technology comprehensive protection measure.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for protecting an open excavation and overpass structure implemented in an ultra-close distance by an iron shield in liquefied soil, that is, to provide a safe and reliable method for protecting an underground structure constructed above an operated iron shield in an ultra-close distance in a soft liquefied soil layer (or similar extremely poor geological conditions), so as to provide guiding significance for similar projects in the future, and to solve the defects in the prior art.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the method for protecting the open-cut and overbridge structure implemented in the ultra-close distance by the iron shield in the liquefied soil comprises the following steps:
respectively building working wells at two sides of a subway shield interval, and erecting support piles at the bottoms of the working wells;
constructing an MJS reinforcing body positioned above a subway shield interval, wherein the MJS reinforcing body is in an M shape, and the subway shield interval is positioned in a hole of the M-shaped structure of the MJS reinforcing body;
building engineering piles which are erected between subway shield sections;
completing construction of a pushing steel pipe curtain before the MJS reinforcement body does not completely form strength, wherein the pushing steel pipe curtain penetrates through the top end of the MJS reinforcement body and is axially perpendicular to the axial direction of the engineering pile; and the number of the first and second groups,
and after the MJS reinforcement body reaches the strength, excavating and constructing a newly-built underground structure bottom plate at the top part of the MJS reinforcement body in a subsection mode, wherein the newly-built underground structure bottom plate, the engineering piles and part of supporting piles of the working well form a bench structure, and balancing weights are carried out above the bench structure.
If the protection method of the open-cut overpass structure is implemented in the ultra-close distance of the iron shield in the liquefied soil, a retarder is doped in the construction process of the MJS reinforcement body.
And (3) implementing the open excavation overpass structure protection method in ultra-close distance by the iron shield in the liquefied soil, and injecting cement slurry or super-fluid fine aggregate concrete into the incremental launching steel pipe curtain after finishing the construction of the incremental launching steel pipe curtain.
The technical scheme of the invention has the beneficial effects that:
the invention provides an implementation method which can control the deformation of an existing shield in a weak liquefied soil layer extremely sensitive to construction vibration and meets the safety requirement of an operated subway track, is a safe and reliable shield protection method with multiple technologies, and mainly comprises the steps of completing the protection of an existing shield section under the liquefied soil layer in a three-in-one manner by comprehensively adopting multiple technical means of an M-shaped MJS reinforcing body, a pushing steel pipe curtain (inner grouting) and a bench structure, and meeting the safety requirement of the operated subway.
Drawings
To further illustrate the above objects, structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.
FIG. 1 is a sectional view of a shield protection measure node of a subway in a liquefied soil layer according to a preferred embodiment of the present invention;
FIG. 2 is a plan view of a shield protection measure node of a subway in a liquefied soil layer according to a preferred embodiment of the present invention;
FIG. 3 is a cross-sectional view of the comprehensive protection of the MJS reinforcement, steel tube curtain and stool structure above the shield in accordance with the preferred embodiment of the present invention;
in the figure: 1. a subway shield zone; 2. a working well; 3. supporting piles; 4. MJS reinforcement of the solid; 5. engineering piles; 6. pushing the steel pipe curtain; 7. newly building an underground structure bottom plate; 8. and (7) balancing the weight.
Detailed Description
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
Referring to fig. 1, 2 and 3, the method for protecting the open cut overpass structure by the shield of the iron in the liquefied soil in the ultra-short distance comprises the following steps: firstly, respectively building working wells 2 at two sides of a subway shield interval 1, and erecting support piles 3 at the bottoms of the working wells 2; constructing an MJS reinforcing body 4 positioned above the subway shield zone 1, wherein the MJS reinforcing body 4 is in an M shape, and the subway shield zone 1 is positioned in a hole of the M-shaped structure of the MJS reinforcing body 4; building engineering piles 5, wherein the engineering piles 5 are erected between the subway shield sections 1; before the MJS reinforcement body 4 does not completely form strength, construction of a pushing steel pipe curtain 6 is completed, the pushing steel pipe curtain 6 penetrates through the top end of the MJS reinforcement body 4, and the axial direction of the pushing steel pipe curtain 6 is perpendicular to the axial direction of the engineering pile 5; and after the MJS reinforcing body 4 reaches the strength, excavating and constructing a newly-built underground structure bottom plate 7 at the top part of the MJS reinforcing body 4 in sections, wherein the newly-built underground structure bottom plate 7, the implemented engineering piles 5 and part of the supporting piles 3 of the working wells 2 on two sides form a bench structure, balancing weight is carried out above the bench structure, and the specific size of the balancing weight 8 is based on the actual construction environment.
In a preferable scheme, a retarder is doped in the construction process of the MJS reinforcing body 4, so that the smooth implementation of the pushing steel tube curtain 6 is ensured, and an integrated protection measure is formed by combining the pushing steel tube curtain with the MJS reinforcing body 4.
After the construction of the pushing steel pipe curtain 6 is completed, cement slurry or super-flow fine aggregate concrete is injected into the pushing steel pipe curtain 6, and the bending rigidity of the steel pipe curtain is increased.
The invention provides an implementation method capable of controlling deformation of an existing shield and meeting the safety of an operated subway track in a soft liquefied soil layer extremely sensitive to construction vibration, which is a safe and reliable shield protection method with multiple technology combinations.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (3)
1. A protection method for an open cut and overpass structure implemented by an iron shield in liquefied soil in an ultra-close distance is characterized by comprising the following steps:
respectively building working wells (2) on two sides of a subway shield interval (1), and erecting support piles (3) at the bottoms of the working wells (2);
constructing an MJS reinforcing body (4) above a subway shield interval (1), wherein the MJS reinforcing body (4) is in an M shape, and the subway shield interval (1) is positioned in a hole of the M-shaped structure of the MJS reinforcing body (4);
building engineering piles (5), wherein the engineering piles (5) are erected between the subway shield sections (1);
before the MJS reinforcement body (4) does not completely form strength, construction of a pushing steel pipe curtain (6) is completed, the pushing steel pipe curtain (6) penetrates through the top end of the MJS reinforcement body (4), and the axial direction of the pushing steel pipe curtain (6) is perpendicular to the axial direction of the engineering pile (5); and (c) a second step of,
and after the MJS reinforcement body (4) reaches the strength, excavating and constructing a newly-built underground structure bottom plate (7) on the top part of the MJS reinforcement body (4) in sections, wherein the newly-built underground structure bottom plate (7), the engineering piles (5) and part of the supporting piles (3) of the working well (2) form a bench structure, and balancing weight is carried out above the bench structure.
2. The method for protecting the open excavation and overpass structure by the shield of the iron in the liquefied soil at the ultra-close distance according to claim 1, wherein a retarder is doped in the construction process of the MJS reinforcement body (4).
3. The method for protecting the open-cut and up-span structure implemented by the shield machine in the liquefied soil in the ultra-short distance according to claim 1, wherein cement slurry or super-fluidized fine aggregate concrete is injected into the top-pushing steel pipe curtain (6) after the construction of the top-pushing steel pipe curtain (6) is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211077708.8A CN115354667A (en) | 2022-09-05 | 2022-09-05 | Protection method for super-close distance implementation open excavation and overpass structure of subway shield in liquefied soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211077708.8A CN115354667A (en) | 2022-09-05 | 2022-09-05 | Protection method for super-close distance implementation open excavation and overpass structure of subway shield in liquefied soil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115354667A true CN115354667A (en) | 2022-11-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211077708.8A Pending CN115354667A (en) | 2022-09-05 | 2022-09-05 | Protection method for super-close distance implementation open excavation and overpass structure of subway shield in liquefied soil |
Country Status (1)
| Country | Link |
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| CN (1) | CN115354667A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117587858A (en) * | 2023-11-29 | 2024-02-23 | 陕西建工集团股份有限公司 | Tunnel deformation control method in loading and unloading process above existing subway tunnel |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020056834A1 (en) * | 2000-11-13 | 2002-05-16 | Marcel Sennhauser | Catchment net for rockfall catchment systems or the like |
| CN102839674A (en) * | 2012-09-19 | 2012-12-26 | 中国水电顾问集团华东勘测设计研究院 | Foundation pit excavation supporting structure on near end well shield tunnel and construction method of foundation pit excavation supporting structure |
| CN107401161A (en) * | 2017-07-11 | 2017-11-28 | 中铁第勘察设计院集团有限公司 | High ferro shield tunnel construction method is worn under pipe-roof method and MJS method joint reinforcements |
| CN113565525A (en) * | 2021-08-28 | 2021-10-29 | 中铁上海工程局集团有限公司 | Construction protection system and construction method for newly-built shield tunnel super-close ultra-shallow buried upper-span existing tunnel |
| CN114908805A (en) * | 2022-06-07 | 2022-08-16 | 中建七局安装工程有限公司 | Strip drawing construction method for open cut tunnel with subway striding upwards |
-
2022
- 2022-09-05 CN CN202211077708.8A patent/CN115354667A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020056834A1 (en) * | 2000-11-13 | 2002-05-16 | Marcel Sennhauser | Catchment net for rockfall catchment systems or the like |
| CN102839674A (en) * | 2012-09-19 | 2012-12-26 | 中国水电顾问集团华东勘测设计研究院 | Foundation pit excavation supporting structure on near end well shield tunnel and construction method of foundation pit excavation supporting structure |
| CN107401161A (en) * | 2017-07-11 | 2017-11-28 | 中铁第勘察设计院集团有限公司 | High ferro shield tunnel construction method is worn under pipe-roof method and MJS method joint reinforcements |
| CN113565525A (en) * | 2021-08-28 | 2021-10-29 | 中铁上海工程局集团有限公司 | Construction protection system and construction method for newly-built shield tunnel super-close ultra-shallow buried upper-span existing tunnel |
| CN114908805A (en) * | 2022-06-07 | 2022-08-16 | 中建七局安装工程有限公司 | Strip drawing construction method for open cut tunnel with subway striding upwards |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117587858A (en) * | 2023-11-29 | 2024-02-23 | 陕西建工集团股份有限公司 | Tunnel deformation control method in loading and unloading process above existing subway tunnel |
| CN117587858B (en) * | 2023-11-29 | 2024-04-26 | 陕西建工集团股份有限公司 | Tunnel deformation control method in loading and unloading process above existing subway tunnel |
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