CN112359868B - Underground passage construction method closely attached to existing underground structure - Google Patents
Underground passage construction method closely attached to existing underground structure Download PDFInfo
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- CN112359868B CN112359868B CN202011201262.6A CN202011201262A CN112359868B CN 112359868 B CN112359868 B CN 112359868B CN 202011201262 A CN202011201262 A CN 202011201262A CN 112359868 B CN112359868 B CN 112359868B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- 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
- E02D17/06—Foundation trenches ditches or narrow shafts
- E02D17/08—Bordering or stiffening the sides of ditches trenches or narrow shafts for foundations
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- 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
- E02D17/06—Foundation trenches ditches or narrow shafts
- E02D17/08—Bordering or stiffening the sides of ditches trenches or narrow shafts for foundations
- E02D17/083—Shoring struts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
- E02D29/05—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
- E02D29/055—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench further excavation of the cross-section proceeding underneath an already installed part of the structure, e.g. the roof of a tunnel
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/16—Arrangement or construction of joints in foundation structures
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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
- E02D3/11—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means
- E02D3/115—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means by freezing
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Soil Sciences (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention discloses a construction method of an underground passage tightly attached to an existing underground structure; the method comprises the following steps: firstly, reinforcing soil above an existing underground structure to form an upper reinforcing layer, and then carrying out open cut construction area construction; pouring an open cut area structure bottom plate and a construction frozen pipe in an open cut construction area; building an outer side structure side wall far away from one side of the existing underground structure; excavating soil bodies in the soil-retaining cover excavation construction area to the bottom position of a structural top plate corresponding to the newly-built underground passage; after erecting the vertical temporary supports, pouring a structural top plate; then, starting freezing construction through a freezing pipe; excavating residual soil mass in the soil-retaining cover excavation construction area to the bottom of the designed foundation pit; pouring and building a new cover excavation area structure bottom plate at the bottom of the designed foundation pit; meanwhile, the side wall of the inner side structure clinging to one side of the existing underground structure is built; and finally, stopping freezing construction, and backfilling the covering soil to a designed elevation. The invention can greatly reduce the influence of the construction of the newly-built channel on the existing underground structure and ensure the safety of construction and operation.
Description
Technical Field
The invention relates to the technical field of underground passage construction, in particular to an underground passage construction method for clinging to an existing underground structure.
Background
In recent years, with further development and utilization of urban underground spaces, new underground communication channels need to be additionally arranged between new or existing underground spaces in order to strengthen the connection among the underground spaces, and in this case, underground channels are more and more constructed by being closely attached to existing underground structures. Many times because existing structure has operated and has played a role, can't close temporarily, consequently not only need guarantee existing underground structure's structural safety during newly-built underground structure construction, still need guarantee existing structure's safe operation.
Because the newly-built underground passage is tightly attached to the existing underground structure, the method generally adopted is to enlarge the foundation pit, contain the existing structure in the whole foundation pit, excavate one side of the existing structure and part of top soil body at one time, and after the newly-built structure is completed, soil is again filled and backfilled.
The construction of newly-built underground passages can be completed by adopting the method, but the method also has the obvious defects that: one side and part of top soil body of the existing structure are dug and removed at one time, so that the stress state of the existing structure is changed, and the structure has the risk of lateral deformation; the settlement deformation of the existing structure can be caused when the water in the foundation pit falls.
Therefore, how to effectively control the lateral deformation and the settlement deformation of the existing structure in the underground passage construction tightly attached to the existing underground structure and reduce the influence on the existing structure becomes a technical problem which needs to be solved by the technical personnel in the field.
Disclosure of Invention
In view of the above-mentioned defects of the prior art, the present invention provides a method for constructing an underground passage closely attached to an existing underground structure, which can effectively control the lateral deformation and the settlement deformation of the existing structure, reduce the influence on the existing structure, and improve the construction efficiency.
In order to achieve the purpose, the invention discloses a construction method of an underground passage tightly attached to an existing underground structure; the method comprises the following steps:
step 1, construction preparation;
step 3, constructing an open cut construction area, excavating a soil body in sequence along with excavation and supporting, and constructing a first concrete support and a second steel support until the soil body is excavated to the bottom of a foundation pit to form an open cut construction area for building a newly-built underground passage;
step 4, pouring an open cut area structure bottom plate of the newly-built underground passage in the open cut construction area; after the concrete strength of the structural bottom plate of the open cut area meets the requirement of design strength, constructing a freezing pipe;
in the process of excavating the soil body of the soil-retaining cover excavation construction area, the underground continuous wall enclosure is excavated along with the excavation to the position corresponding to the bottom of the structure top plate;
after erecting the vertical temporary supports, pouring the structural top plate;
then, starting freezing construction through the freezing pipe; after the frozen soil body of the freezing construction reaches the design freezing depth and strength requirements, excavating the remaining soil body of the soil-retaining covered excavation construction area to the bottom of the design foundation pit; in the process of excavating the residual soil mass in the soil-retaining cover excavation construction area, the underground continuous wall enclosure is excavated to the bottom of the design foundation pit along with excavation;
and 9, after the strength of the concrete of the bottom plate of the covered and excavated area structure and the side wall of the inner side structure meets the requirement of the design strength, dismantling the vertical temporary support, stopping the freezing construction, and backfilling the soil to the design elevation.
Preferably, in step 9, when the freezing construction is terminated, the holes of the freezing pipes in the range of the open cut area structure bottom plate and the cover cut area structure bottom plate need to be blocked.
The invention has the beneficial effects that:
the application of the invention can greatly reduce the influence of the construction of the newly-built channel on the existing underground structure in the construction of the underground channel tightly attached to the existing underground structure, and ensure the structure safety and the operation safety of the existing underground structure.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
Fig. 1 is a schematic diagram illustrating a state after step 3 is completed according to an embodiment of the present invention.
Fig. 2 is a schematic diagram illustrating a state after step 4 is completed according to an embodiment of the present invention.
Fig. 3 shows a schematic diagram of the state after step 5 according to an embodiment of the present invention.
Fig. 4 shows a schematic diagram of the state after step 6 according to an embodiment of the present invention.
Fig. 5 shows a schematic diagram of the state after step 7 according to an embodiment of the present invention.
Fig. 6 shows a schematic diagram of a state after step 9 according to an embodiment of the present invention.
Fig. 7 shows a schematic view of a planar open cut construction area and a cut-and-cover construction area in an embodiment of the present invention.
Detailed Description
Examples
As shown in fig. 7, the method for constructing the underground passage tightly attached to the existing underground structure is adopted for the plane open cut construction area and the soil-retaining cover excavation construction area, and comprises the following steps:
step 1, construction preparation;
as shown in fig. 1, step 2, carrying out omnibearing ultrahigh pressure injection grouting reinforcement on a soil body above an existing underground structure 7 to form an upper reinforcing layer 8, and then sequentially constructing a bored pile enclosure 4, a waterproof curtain 3, an underground continuous wall enclosure 5 and an omnibearing ultrahigh pressure injection grouting pit bottom reinforcing layer 6 in an open cut construction area;
step 3, constructing an open cut construction area, excavating a soil body in sequence along with excavation and supporting, and constructing a first concrete support 1 and a second steel support 2 until the soil body is excavated to the bottom of a foundation pit to form an open cut construction area for building a newly-built underground passage;
step 4, pouring an open cut area structure bottom plate 9 of a newly-built underground passage in the open cut construction area, as shown in fig. 2; after the concrete strength of the structural bottom plate 9 of the open cut area meets the requirement of the design strength, constructing the freezing pipe 10;
as shown in fig. 3, step 5, building the outer structure side wall 12 of the newly-built underground passage away from one side of the existing underground structure 7 to the bottom position of the second steel support 2; after the concrete strength of the side wall 12 of the outer side structure meets the requirement of the design strength, erecting a horizontal support change 11, and dismantling a second steel support 2;
as shown in fig. 4, step 6, the first concrete support 1 is dismantled; excavating soil bodies in the soil-retaining covered excavation construction area to the bottom position of a structural top plate 13 corresponding to the newly-built underground passage;
in the process of excavating the soil body of the soil-retaining cover excavation construction area, the underground continuous wall enclosure 5 is excavated to the position corresponding to the bottom of the structure top plate 13;
after erecting the vertical temporary supports 14, pouring a structural top plate 13;
as shown in fig. 5, in step 7, after the concrete strength of the structural top plate 13 meets the requirement of the design strength, the horizontal support 11 is removed;
then, the freezing construction is started through the freezing pipe 10; after the frozen soil body of the freezing construction reaches the design freezing depth and strength requirements, excavating the remaining soil body of the soil-retaining covered excavation construction area to the bottom of the design foundation pit; in the process of excavating the residual soil mass in the soil-retaining cover excavation construction area, the underground continuous wall enclosure 5 is excavated to the bottom of the designed foundation pit along with excavation;
as shown in fig. 6, step 8, building a newly-built cover-excavation-area-structure bottom plate 16 at the bottom of the designed foundation pit, and connecting the cover-excavation-area-structure bottom plate 16 with the open-excavation-area-structure bottom plate 9; meanwhile, the inner side structure side wall 15 of the newly-built underground passage tightly attached to one side of the existing underground structure 7 is built, and the inner side structure side wall 15 is connected with the structure top plate 13;
and 9, after the concrete strength of the bottom plate 16 of the covered and excavated area structure and the side wall 15 of the inner side structure meets the requirement of the design strength, removing the vertical temporary support 14, stopping the freezing construction, and backfilling the soil to the designed elevation.
The principle of the invention is as follows:
dividing a newly-built underground passage foundation pit into an open excavation construction area and a soil-retaining cover excavation construction area, and determining the range of the two areas by comprehensively considering the operation space requirements of excavation and freezing construction and the safety protection requirements of the existing underground structure.
In practical application, the underground continuous wall 5 can be used as a boundary, the west side of the underground continuous wall 5 is an open excavation construction area, and the east side of the underground continuous wall is a soil-retaining cover excavation construction area.
When the open cut construction area foundation pit and the partial channel structure in the foundation pit are constructed, the soil body in the soil retaining cover excavation construction area is kept still, and therefore the influence of open cut construction area construction on the existing underground structure can be effectively reduced.
When the construction of the soil-retaining cover excavation construction area is carried out, the top soil body of the existing structure is reinforced by adopting omnibearing ultrahigh pressure injection grouting, the bottom soil body is reinforced by adopting a freezing method, and the water stopping effect is achieved.
And after the top plate of the newly-built underground passage is jacked to the existing structure to provide effective support, and simultaneously, after the top and bottom reinforcements reach the designed strength, digging the soil body of the excavation construction area covered by the remained soil and constructing the rest passage structure, and finally, earthing and backfilling after the newly-built passage structure is completed.
In step 9, when the freezing process is terminated, the holes of the freezing pipes 10 in the range of the open cut area structure bottom plate 9 and the cover cut area structure bottom plate 16 need to be blocked.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (2)
1. An underground passage construction method clinging to an existing underground structure; the method comprises the following steps:
step 1, construction preparation;
step 2, carrying out omnibearing ultrahigh pressure jet grouting reinforcement on a soil body above an existing underground structure (7) to form an upper reinforcing layer (8), and then sequentially constructing a bored pile enclosure (4), a waterproof curtain (3), an underground continuous wall enclosure (5) and an omnibearing ultrahigh pressure jet grouting pit bottom reinforcing layer (6) in an open cut construction area;
one side of the underground continuous wall enclosure (5) faces the open cut construction area, and the other side of the underground continuous wall enclosure faces the soil-retaining cover excavation construction area;
before constructing a foundation pit of the open cut construction area, constructing the cast-in-situ bored pile enclosure (4) and the waterproof curtain (3);
step 3, constructing an open cut construction area, excavating a soil body in sequence along with excavation and supporting, and constructing a first concrete support (1) and a second steel support (2) until the soil body is excavated to the bottom of a foundation pit to form an open cut construction area for building a newly-built underground passage;
step 4, pouring an open cut area structure bottom plate (9) of the newly-built underground passage in the open cut construction area; after the concrete strength of the open cut area structure bottom plate (9) meets the requirement of design strength, constructing a freezing pipe (10);
the freezing pipe (10) is arranged between the open cut area structure bottom plate (9) and the bottom of the existing underground structure (7);
step 5, building an outer side structure side wall (12) of the newly-built underground passage far away from one side of the existing underground structure (7) to the bottom of the second steel support (2); after the concrete strength of the outer side structure side wall (12) meets the requirement of design strength, erecting a horizontal change support (11), and dismantling the second steel support (2);
step 6, dismantling the first concrete support (1); excavating soil bodies of the soil-retaining covered excavation construction area to the bottom position of a structure top plate (13) corresponding to the newly-built underground passage;
in the process of excavating the soil body of the soil-retaining cover excavation construction area, the underground continuous wall enclosure (5) is excavated to a position corresponding to the bottom of the structure top plate (13);
after erecting the vertical temporary supports (14), pouring the structural top plate (13);
step 7, after the concrete strength of the structural top plate (13) meets the requirement of design strength, removing the horizontal support (11);
then, starting freezing construction through the freezing pipe (10); after the frozen soil body of the freezing construction reaches the design freezing depth and strength requirements, excavating the remaining soil body of the soil-retaining covered excavation construction area to the bottom of the design foundation pit; in the process of excavating the residual soil mass in the soil-retaining cover excavation construction area, the underground continuous wall enclosure (5) is excavated to the bottom of the design foundation pit along with excavation;
step 8, pouring a newly-built cover-excavation area structure bottom plate (16) at the bottom of the designed foundation pit, and connecting the cover-excavation area structure bottom plate (16) with the open-excavation area structure bottom plate (9); simultaneously, building an inner side structure side wall (15) of the newly-built underground passage tightly attached to one side of the existing underground structure (7) in a return mode, and connecting the inner side structure side wall (15) with the structure top plate (13);
and 9, after the concrete strength of the bottom plate (16) of the covered and excavated area structure and the side wall (15) of the inner side structure meets the requirement of the design strength, dismantling the vertical temporary support (14), stopping the freezing construction, and backfilling the soil to the designed elevation.
2. A method of constructing an underground passage adjacent to an existing underground structure according to claim 1, wherein in the step 9, when the freezing operation is terminated, it is necessary to block the holes of the freezing pipes (10) within the range of the open cut area structure bottom plate (9) and the cover cut area structure bottom plate (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011201262.6A CN112359868B (en) | 2020-11-02 | 2020-11-02 | Underground passage construction method closely attached to existing underground structure |
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| CN202011201262.6A CN112359868B (en) | 2020-11-02 | 2020-11-02 | Underground passage construction method closely attached to existing underground structure |
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| CN113565104A (en) * | 2021-07-22 | 2021-10-29 | 上海建工集团股份有限公司 | Construction method of ramp connecting part without influencing main line traffic |
| CN113982036A (en) * | 2021-10-26 | 2022-01-28 | 上海建工一建集团有限公司 | Construction method for structure penetration when frame column and mid-partition wall are overlapped |
| CN115977152B (en) * | 2023-03-20 | 2023-06-09 | 中国铁路设计集团有限公司 | Construction method for breaking and reforming roof of existing subway station |
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| KR101248860B1 (en) * | 2010-09-15 | 2013-03-29 | 변웅호 | Temporary support for open cut and cover method, and structure using the same |
| CN103485790A (en) * | 2013-10-11 | 2014-01-01 | 中交第二公路勘察设计研究院有限公司 | Shallow tunneling method for pipe-proof-supporting structure combined system |
| CN109854253B (en) * | 2019-03-20 | 2021-08-03 | 中国铁路设计集团有限公司 | Extension method for existing underground excavation and island-stacking transfer station of subway |
| CN111456773B (en) * | 2020-04-16 | 2024-05-24 | 成都市建筑设计研究院有限公司 | Close-fitting type subway station structure combining light and shade excavation and construction method thereof |
| CN111663815A (en) * | 2020-06-15 | 2020-09-15 | 北京中岩智泊科技有限公司 | Tunnel type stereo garage under road and construction method thereof |
| CN111749275B (en) * | 2020-06-23 | 2021-10-15 | 中国建筑第二工程局有限公司 | Cover-excavation top-down underground passage structure and construction method thereof |
| CN111810202B (en) * | 2020-07-20 | 2022-04-15 | 武汉市市政建设集团有限公司 | Underground connecting channel interface construction method |
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