CN112302684B - Large-volume tunnel open cut tunnel structure adopting step pouring and construction method thereof - Google Patents
Large-volume tunnel open cut tunnel structure adopting step pouring and construction method thereof Download PDFInfo
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- CN112302684B CN112302684B CN202011164138.7A CN202011164138A CN112302684B CN 112302684 B CN112302684 B CN 112302684B CN 202011164138 A CN202011164138 A CN 202011164138A CN 112302684 B CN112302684 B CN 112302684B
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- side wall
- tunnel
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- 238000010276 construction Methods 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 31
- 239000010959 steel Substances 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000007788 roughening Methods 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims 4
- 239000002689 soil Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract 2
- 230000002787 reinforcement Effects 0.000 description 6
- 239000011435 rock Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to a large-volume tunnel open cut tunnel structure adopting step pouring and a construction method thereof, wherein the structure mainly comprises two longitudinally parallel bottom longitudinal beams, a side wall which is manufactured in advance is arranged above the bottom longitudinal beams, an inner arch is arranged between the tops of the two side walls, an outer arch which is manufactured in later stage is arranged above the inner arch, and the side wall, the inner arch and the outer arch which are manufactured above the bottom longitudinal beams in sequence form a circular continuous open cut tunnel structure. The open cut tunnel main body structure is reasonably decomposed, comprises the side wall and the arch part, the arch part is divided into an inner layer structure and an outer layer structure, the side wall is firstly constructed, and the inner arch and the outer arch are sequentially constructed after the construction is completed. When the soil body covered on the open cut tunnel is thicker or bears larger load, the structure is required to have enough thickness, and for thicker arch part structures, special high-strength template support is required, so that the manufacturing process and the manufacturing cost of the template are increased, and the large-volume concrete is not easy to pour, vibrate and maintain.
Description
Technical Field
The invention relates to the technical field of tunnels and underground engineering, in particular to a large-volume tunnel open cut tunnel structure adopting step pouring and a construction method thereof.
Background
When a railway or highway is built under geographical conditions of complex topography, valley development and dangerous topography, a line usually passes through a mountain in a tunnel type and passes through a valley river in a bridge type. In the V-shaped valley area, the connection cannot be usually carried out in a roadbed mode, but the transition is carried out in a bridge-tunnel connection mode due to the limitation of the integral elevation of the line and the span arrangement of bridge holes. In order to implement the construction concept of 'early entering and late exiting' of a tunnel, an extension open cut tunnel is generally adopted at a tunnel opening, so that the overall stability of surrounding rocks at the opening section can be improved, and adverse effects of undesirable geological disasters such as dangerous rocks and falling rocks at the top of the tunnel on a line can be effectively prevented.
The tunnel is limited by geological conditions and other factors, the open cut construction method is adopted for construction, when the top soil covering layer is thicker in the later period, higher requirements are put forward on the stress of the open cut tunnel structure, the open cut tunnel structure needs to be thickened under the conditions of the thick top soil covering layer and the falling and striking prevention of objects, and a large-volume concrete construction is formed, so that higher requirements are put forward on the template trolley of the open cut tunnel structure and the processes of pouring, vibrating, maintaining and the like of the large-volume concrete, and economic, reasonable and ingenious solving is needed.
At present, open cut tunnel construction is generally carried out in a cast-in-place concrete mode, reinforcing steel bars are bound integrally on side walls and arch parts, templates are integrally built on the inner sides, and a continuous structure is formed in one step through cast-in-place. In the construction process, when the thickness of the structure is large, the weight of the structure is also heavy, and special high-strength template trolley support is needed; the method has the advantages that higher requirements are provided for the processes of pouring, vibrating, curing and the like of mass concrete, and diseases such as uncompacted structure or cracking and the like are easy to occur if the control is not good; and the side wall and the arch part are synchronously poured, when the structural strength is not completely achieved, the structural strength is heavy, creep is easy to occur under the continuous influence of dead weight after the die is removed, so that the structure is deformed to generate cracks, and structural damage and structural potential safety hazards are formed.
Disclosure of Invention
The invention aims to provide a large-volume tunnel open cut tunnel structure adopting step pouring and a construction method thereof, and the problems of unreasonable safety, economy and the like of the disposable integral pouring of the large-volume open cut tunnel structure are overcome by step pouring different parts of the open cut tunnel structure to finally form an integral structure.
The technical scheme adopted by the invention is as follows:
adopt the massive tunnel open cut tunnel structure of step by step pouring, its characterized in that:
The structure comprises two longitudinally parallel side sills, wherein side walls which are manufactured in advance are arranged above the side sills, an inner arch is arranged between the tops of the side walls at the two sides, an outer arch which is manufactured in later stage is arranged above the inner arch, and the side walls, the inner arch and the outer arch which are manufactured above the side sills in sequence form a circular continuous open cut tunnel structure.
The top of the side wall is provided with a tongue-and-groove to form a step-shaped structure with high outside and low inside, and two ends of the inner arch are connected to the inner side of the top of the side wall; the outer arches are connected at both ends to the top outer side of the side wall.
The inner arch and the outer arch are constructed within the range of about 120-140 degrees at the top of the open cut tunnel.
The top surface of the bottom longitudinal beam is exposed with reserved steel bar joints and steel bar connectors.
The steel bars at the bottom of the side wall are connected with reserved steel bar joints on the top surface of the bottom longitudinal beam through steel bar connectors, and the reserved steel bar joints and the reserved steel bar connectors are exposed at the top of the side wall.
The steel bars in the bottoms of the two ends of the inner arch and the outer arch are respectively connected with reserved steel bar joints at the top of the side wall through steel bar connectors.
The inner arch is used as the bottom template of the outer arch to strengthen the combination of the inner and outer structures, and the top of the inner arch is roughened.
The construction method of the large-volume tunnel open cut tunnel structure by adopting step pouring is characterized by comprising the following steps of:
The method mainly comprises the following steps:
step one: constructing a bottom longitudinal beam to provide a substrate support for the upper open cut tunnel structure;
step two: constructing side walls on two sides of the open cut tunnel, and reserving a structural tongue-and-groove and stubble-connecting reinforcing bars;
step three: constructing an open cut tunnel lining structure in the arch part range, namely an inner arch, roughening the surface after the stress strength is reached, enabling the whole open cut tunnel structure to be closed into a ring at first, and simultaneously taking the open cut tunnel lining structure as a pouring inner mold of the outer open cut tunnel lining structure of the arch part, namely an outer arch;
step four: and constructing an outer arch to finish pouring of the whole open cut tunnel structure.
The invention has the following advantages:
The main structure of the large-volume open cut tunnel is reasonably decomposed, the main structure comprises two parts of a side wall and an arch part, and the arch part is divided into an inner layer structure and an outer layer structure. Firstly, constructing the side wall, and then constructing an inner arch and an outer arch in sequence after the construction is completed, which is equivalent to loading the side wall in the arch part stage, so that the stability of the side wall structure is ensured; meanwhile, the problems of special template trolley, mass concrete pouring, vibration and maintenance are not easy to fully, creep is easy to occur due to large self weight of the structure after the die is removed, and thus the structural deformation, cracking and other series of structural quality defects caused by one-time overall pouring of mass concrete at the arch part are avoided.
After the step-by-step implementation, a general template trolley can be adopted, no special custom-made template trolley is required to be added, after the construction of the inner arch is completed, a closed loop is formed on the structure, the bottom template of the outer arch can be considered, the inner arch structure is skillfully utilized, and the investment of construction cost is reduced; the arch structure is divided into an inner layer and an outer layer to be respectively implemented, and related adverse factors and structural risk hidden dangers caused by one-time large-volume concrete pouring can be avoided.
The invention can ensure the stress continuity among all the partial structures through reasonable reinforcement and connection schemes, and ensure the stress conduction and the structural integrity.
Drawings
Fig. 1 is a cross-sectional view of an open cut tunnel structure according to the present invention.
Figure 2 is a cross-section reinforcement view of the open cut tunnel structure according to the present invention.
Fig. 3 is a schematic diagram of node a in fig. 2.
Fig. 4 is a schematic diagram of the node B of fig. 2.
Fig. 5 is a schematic view of a side sill reinforcement and reserved bar connector.
Fig. 6 is a schematic view of an inside arch reinforcement.
Fig. 7 is a schematic view of an outboard arch reinforcement.
Fig. 8 is a schematic view of a side wall reinforcement bar and a reserved bar connector.
The marks in the figure are as follows: 1-side sill, 2-side wall, 3-inner arch, 4-outer arch, 5-inner rail top surface, 6-reserved steel bar connector joint.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The invention relates to a large-volume tunnel open cut tunnel structure adopting step pouring, which comprises two longitudinally parallel bottom longitudinal beams 1, wherein side walls 2 which are applied earlier are arranged above the bottom longitudinal beams 1, an inner arch 3 is arranged between the tops of the side walls 2 at two sides, and an outer arch 4 which is applied later is arranged above the inner arch 3. The side wall 2, the inner arch 3 and the outer arch 4 which are sequentially arranged above the side sill 1 form a circumferentially continuous open cut tunnel structure.
The top of the side wall 2 is provided with a tongue-and-groove to form a step-shaped structure with high outside and low inside, two ends of the inner arch 3 are connected to the inner side of the top of the side wall 2, and two ends of the outer arch 4 are connected to the outer side of the top of the side wall 2. The inner arch 3 and the outer arch 4 are constructed within the range of 120-140 degrees at the top of the open cut tunnel.
The top surface of the side sill 1 is exposed with reserved steel bar joints and steel bar connectors. The steel bars at the bottom of the side wall 2 are connected with reserved steel bar joints at the top surface of the bottom longitudinal beam 1 through steel bar connectors, the reserved steel bar joints and the steel bar connectors are exposed at the top of the side wall 2, the steel bars at the bottoms of the two ends of the inner arch 3 and the outer arch 4 are connected with the reserved steel bar joints at the top of the side wall 2 through the steel bar connectors, and thus a binding closed loop of open cut tunnel structural steel bars is formed.
The inner arch 3 is implemented earlier and then serves as a bottom surface template for the outer arch 4, and the top surface of the inner arch 3 is roughened to enhance the inter-bonding between the inner and outer arch structures.
The construction method of the large-volume tunnel open cut tunnel structure adopting step pouring comprises the following main steps:
Step one: a side sill 1 is constructed to provide a stable base support for the superstructure;
step two: constructing side walls 2 on two sides of the open cut tunnel, and reserving structural rabbets and stubble-connecting reinforcing bars at the top;
Step three: constructing an inner open cut tunnel lining structure in the arch part range, namely an inner arch 3, and roughening the surface of the inner arch 3 after the inner arch 3 reaches the stress intensity to ensure that the whole open cut tunnel structure is firstly closed into a ring, and simultaneously taking the closed open cut tunnel lining structure as a pouring template of an outer open cut tunnel lining structure of the arch part, namely an outer arch 4;
step four: and constructing an outer arch 4 to finish pouring of the whole open cut tunnel structure.
The content of the invention is not limited to the examples listed, and any equivalent transformation to the technical solution of the invention that a person skilled in the art can take on by reading the description of the invention is covered by the claims of the invention.
Claims (6)
1. Adopt the massive tunnel open cut tunnel structure of step by step pouring, its characterized in that:
The structure comprises two longitudinally parallel side sills (1), wherein a side wall (2) which is manufactured in advance is arranged above the side sills (1), an inner arch (3) is arranged between the tops of the side walls (2) at two sides, an outer arch (4) which is manufactured in later stage is arranged above the inner arch (3), and the side wall (2), the inner arch (3) and the outer arch (4) which are manufactured above the side sills (1) in sequence form a circular continuous open cut tunnel structure together;
The top of the side wall (2) is provided with a tongue-and-groove to form a step-shaped structure with high outside and low inside, and two ends of the inner arch (3) are connected to the inner side of the top of the side wall (2); the two ends of the outer arch (4) are connected to the outer side of the top of the side wall (2);
The inner arch (3) and the outer arch (4) are constructed within the range of 120-140 degrees at the top of the open cut tunnel.
2. The mass tunnel open cut tunnel structure employing step casting according to claim 1, wherein:
the top surface of the bottom longitudinal beam (1) is exposed with reserved steel bar joints and steel bar connectors.
3. The mass tunnel open cut tunnel structure employing step casting according to claim 2, wherein:
The steel bars at the bottom of the side wall (2) are connected with reserved steel bar joints on the top surface of the bottom longitudinal beam (1) through steel bar connectors, and the reserved steel bar joints and the reserved steel bar connectors are exposed out of the top of the side wall (2).
4. A bulk tunnel open cut tunnel structure employing step casting as defined in claim 3, wherein:
The steel bars in the bottoms of the two ends of the inner arch (3) and the outer arch (4) are respectively connected with reserved steel bar joints at the top of the side wall (2) through steel bar connectors.
5. The mass tunnel open cut tunnel structure employing step casting according to claim 4, wherein:
The inner arch (3) which is applied earlier is used as a bottom surface template of the outer arch (4) which is applied later, and the top surface of the inner arch (3) is roughened in order to enhance the mutual combination of the inner and outer structures.
6. The construction method for the large-volume tunnel open cut tunnel structure by adopting step pouring according to claim 1, which is characterized by comprising the following steps:
The method mainly comprises the following steps:
step one: the construction side sill (1) is used for providing a substrate support for the upper open cut tunnel structure;
step two: constructing side walls (2) on two sides of the open cut tunnel, and reserving a structural tongue-and-groove and stubble-connecting reinforcing bars;
Step three: constructing an open cut tunnel lining structure in the arch part range, namely an inner arch (3), and roughening the surface after the stress strength is reached, so that the whole open cut tunnel structure is firstly closed into a ring, and simultaneously, the open cut tunnel lining structure can be taken as a pouring internal mold of an outer open cut tunnel lining structure of the arch part, namely an outer arch (4);
step four: and constructing an outer arch (4) to finish pouring of the whole open cut tunnel structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011164138.7A CN112302684B (en) | 2020-10-27 | 2020-10-27 | Large-volume tunnel open cut tunnel structure adopting step pouring and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011164138.7A CN112302684B (en) | 2020-10-27 | 2020-10-27 | Large-volume tunnel open cut tunnel structure adopting step pouring and construction method thereof |
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| CN112302684A CN112302684A (en) | 2021-02-02 |
| CN112302684B true CN112302684B (en) | 2024-07-09 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN213898990U (en) * | 2020-10-27 | 2021-08-06 | 中铁第一勘察设计院集团有限公司 | Large-volume open cut tunnel structure adopting step-by-step pouring |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3285261B2 (en) * | 1993-09-28 | 2002-05-27 | 飛島建設株式会社 | Precast formwork for tunnel lining |
| CN103147771A (en) * | 2013-03-24 | 2013-06-12 | 中铁二院工程集团有限责任公司 | Long-span high-backfill open cut tunnel structure |
| CN107120119B (en) * | 2017-05-04 | 2019-06-04 | 中交第二航务工程局有限公司 | The construction method of Underground Subway Station |
| CN208203303U (en) * | 2018-05-08 | 2018-12-07 | 武汉中交工程咨询顾问有限责任公司 | A kind of separate tunnel liner structure |
| CN211144503U (en) * | 2019-05-08 | 2020-07-31 | 中铁二十二局集团第五工程有限公司 | High steep topography bridge tunnel meets section open cut tunnel and connects long structure |
| CN110905553B (en) * | 2019-12-05 | 2022-04-05 | 中铁二十局集团第六工程有限公司 | Tunnel secondary lining finishing method for sleeve lining mould construction |
| CN211648183U (en) * | 2020-01-23 | 2020-10-09 | 中铁二院工程集团有限责任公司 | Assembled tunnel lining structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN213898990U (en) * | 2020-10-27 | 2021-08-06 | 中铁第一勘察设计院集团有限公司 | Large-volume open cut tunnel structure adopting step-by-step pouring |
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