CN112302684A - Large-volume tunnel open cut tunnel structure adopting step-by-step pouring and construction method thereof - Google Patents
Large-volume tunnel open cut tunnel structure adopting step-by-step pouring and construction method thereof Download PDFInfo
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- CN112302684A CN112302684A CN202011164138.7A CN202011164138A CN112302684A CN 112302684 A CN112302684 A CN 112302684A CN 202011164138 A CN202011164138 A CN 202011164138A CN 112302684 A CN112302684 A CN 112302684A
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- open cut
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- 238000010276 construction Methods 0.000 title claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 25
- 239000010959 steel Substances 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 9
- 238000007788 roughening Methods 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims 6
- 238000004519 manufacturing process Methods 0.000 abstract 2
- 239000002689 soil Substances 0.000 abstract 1
- 230000003014 reinforcing effect Effects 0.000 description 8
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 6
- 230000002787 reinforcement Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
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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 open cut tunnel structure adopting step-by-step pouring and a construction method thereof. The open cut tunnel main structure is reasonably decomposed and comprises the side walls and the arch parts, the arch parts are divided into an inner layer structure and an outer layer structure, the side walls are firstly constructed, and the inner side arch and the outer side arch are sequentially constructed after the side walls are constructed. When the covered soil body of the open cut tunnel is thick or bears a large load, the structure needs to have enough thickness, and for the thick arch part structure, a special high-strength template support is needed, so that the manufacturing process and 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 open cut tunnel structure adopting step-by-step pouring and a construction method thereof.
Background
When a railway or a highway is constructed under the geographical conditions of complex landform, valley development and severe terrains, the line usually passes through a mountain body in a tunnel type and crosses a valley river in a bridge type. In the V-shaped valley area, the whole elevation of the line and the arrangement of the bridge hole span are limited, and the line cannot be connected in a roadbed mode generally, but is transited in a bridge-tunnel connection mode. In order to implement the construction concept of 'early-in and late-out' of the tunnel, the tunnel portal is generally provided with the lengthened open cut tunnel, so that the overall stability of surrounding rocks at the portal section can be improved, and adverse influences of adverse geological disasters such as dangerous rockfall at the tunnel roof on the line can be effectively prevented.
The tunnel is built by an open cut construction method under the condition of being limited by factors such as geological conditions, a higher requirement is provided for the stress of the open cut tunnel structure when a top covering layer is thick in the later period, the open cut tunnel structure needs to be thickened to form large-volume concrete construction under the conditions that the top covering layer is thick and objects are prevented from falling and hitting, the higher requirements are provided for the formwork trolley of the open cut tunnel structure and the processes of pouring, vibrating, maintaining and the like of the large-volume concrete, and the problems need to be solved economically, reasonably and skillfully.
At present, open cut tunnel construction is generally carried out in a cast-in-place concrete mode, reinforcing steel bars are integrally bound on side walls and an arch part, a template is integrally built on the inner side of the open cut tunnel, and a continuous structure is integrally formed through cast-in-place. In the construction process, when the thickness of the structure is larger, the weight of the structure is heavier, and the structure needs to be supported by a specially-made high-strength template trolley; the method has the advantages that higher requirements are provided for the processes of pouring, vibrating, maintaining and the like of the large-volume concrete, and the defects of incompact 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 reached, the structure is integrally heavier, creep is easy to occur under the continuous influence of self weight after the form removal, 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-by-step pouring and a construction method thereof, wherein an integral structure is finally formed by pouring different parts of the open cut tunnel structure step by step, and the problems of unreasonable safety and economy and the like existing in one-step integral pouring of the large-volume open cut tunnel structure are solved.
The technical scheme adopted by the invention is as follows:
adopt bulky tunnel open cut tunnel structure of pouring step by step, its characterized in that:
the structure comprises two longitudinally parallel bottom longitudinal beams, side walls which are constructed in advance are arranged above the bottom longitudinal beams, inner side arches are arranged between the tops of the side walls on the two sides, outer side arches which are constructed in the later period are arranged above the inner side arches, and the side walls, the inner side arches and the outer side arches which are constructed in sequence above the bottom longitudinal beams 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 a high outer part and a low inner part, and two ends of the inner side arch are connected to the inner side of the top of the side wall; the two ends of the outer arch are connected to the top outer side of the sidewall.
The inner side arch and the outer side arch are constructed in the range of about 120-140 degrees at the top of the open cut tunnel.
The reserved steel bar joint and the steel bar connector are exposed on the top surface of the bottom longitudinal beam.
The reinforcing steel bar at the bottom of the side wall is connected with the reserved reinforcing steel bar joint at the top surface of the bottom longitudinal beam through a reinforcing steel bar connector, and the reserved reinforcing steel bar joint and the reinforcing steel bar connector are exposed at the top of the side wall.
And the steel bars in the bottoms of the two ends of the inner arch and the outer arch are respectively connected with the reserved steel bar joints at the top of the side wall through steel bar connectors.
The inner arch which is manufactured in advance is used as a bottom template of the outer arch which is manufactured in the later period, and in order to enhance the mutual combination of the inner and outer structures, the top surface of the inner arch is roughened.
The construction method of the large-volume tunnel open cut tunnel structure by adopting step-by-step pouring is characterized by comprising the following steps of:
the method mainly comprises the following steps:
the method comprises the following steps: constructing a bottom longitudinal beam to provide a base support for the upper open cut tunnel structure;
step two: constructing side walls on two sides of the open cut tunnel, and reserving structural tongue-and-groove and connecting steel bars;
step three: constructing an internal lining structure of the open cut tunnel within the arch part range, namely an inner side arch, and roughening the surface after the stress strength is achieved, so that the whole open cut tunnel structure is firstly sealed into a ring, and simultaneously, the internal lining structure of the external open cut tunnel within the arch part range can be taken as a pouring internal mould of the outer side arch;
step four: and constructing an outer side arch to finish the pouring of the whole open cut tunnel structure.
The invention has the following advantages:
the invention reasonably decomposes the main structure of the large-volume open cut tunnel, comprises two parts of a side wall and an arch part, and divides the arch part into an inner layer structure and an outer layer structure. Firstly, constructing a side wall, and then constructing an inner arch and an outer arch in sequence after the construction of the side wall is finished, namely loading the side wall by stages at an arch part, so that the stability of the side wall structure is ensured; meanwhile, the problems of series structural quality defects such as structural deformation, cracking and the like caused by special template trolley, large-volume concrete pouring, insufficient vibration and maintenance and easy creep due to large self weight of the structure after the template is removed due to the fact that the large-volume concrete is poured integrally at one time at the arch part are solved.
After the construction is carried out step by step, a general template trolley can be adopted without increasing investment for specially customizing the template trolley, after the inner side arch is constructed, a closed loop is formed on the structure, the closed loop can be taken as a bottom template of the outer side arch, the inner side arch structure is skillfully utilized, and the investment of construction cost is reduced; the arch part structure is divided into an inner layer and an outer layer to be implemented respectively, 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 parts of the structure through reasonable reinforcement and connection schemes, and ensure the stress conduction and the structural integrity.
Drawings
Fig. 1 is a cross-sectional view of a open-cut tunnel structure according to the present invention.
Fig. 2 is a cross-section reinforcement diagram of the open cut tunnel structure according to the present invention.
Fig. 3 is a schematic diagram of the a node in fig. 2.
Fig. 4 is a schematic diagram of the node B in fig. 2.
Fig. 5 is a schematic view of a bottom longitudinal beam reinforcement and a reserved steel bar connector.
Fig. 6 is a schematic view of an inboard arch reinforcement.
Fig. 7 is a schematic view of the outboard arch reinforcement.
Fig. 8 is a schematic diagram of the reinforcing bars of the side wall and the reserved reinforcing bar connector.
The labels in the figure are: 1-bottom longitudinal beam, 2-side wall, 3-inner side arch, 4-outer side arch, 5-inner rail top surface and 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 open cut tunnel structure adopting step-by-step pouring, which comprises two longitudinally parallel bottom longitudinal beams 1, wherein side walls 2 which are firstly manufactured are arranged above the bottom longitudinal beams 1, an inner side arch 3 is arranged between the tops of the side walls 2 at two sides, and an outer side arch 4 which is later manufactured is arranged above the inner side arch 3. The side wall 2, the inner side arch 3 and the outer side arch 4 which are sequentially constructed above the bottom longitudinal beam 1 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 a high outside and a low inside, two ends of the inner side arch 3 are connected to the inner side of the top of the side wall 2, and two ends of the outer side arch 4 are connected to the outer side of the top of the side wall 2. The inner side arch 3 and the outer side arch 4 are constructed in the range of 120-140 degrees at the top of the open cut tunnel.
The top surface of the bottom longitudinal beam 1 is exposed with a reserved steel bar joint and a steel bar connector. The reinforcing bar of 2 bottoms of side wall and the reservation steel bar joint of 1 top surfaces of end longeron pass through the reinforcing bar connector to be connected, and 2 tops of side wall expose the steel bar joint and the reinforcing bar connector that have the reservation, and the inboard 3 and the outside encircles the reinforcing bar of 4 both ends bottoms and the reservation steel bar joint at 2 tops of side wall and pass through the reinforcing bar connector to be connected, so form the ligature closed loop of open cut tunnel structure reinforcing bar.
The inner arch 3 is implemented in advance and then used as a bottom formwork of the outer arch 4, and the top surface of the inner arch 3 is roughened in order to enhance the mutual combination of the inner arch and the outer arch.
The construction method of the large-volume open cut tunnel structure adopting step-by-step pouring comprises the following main steps of:
the method comprises the following steps: a construction bottom longitudinal beam 1 is used for providing stable base support for an upper structure;
step two: constructing side walls 2 at two sides of the open cut tunnel, and reserving structural tongue-and-groove and connecting steel bars at the top;
step three: constructing an internal open cut tunnel lining structure within the arch part range, namely an inner side arch 3, and roughening the surface of the inner side arch 3 after the inner side arch 3 reaches the stress strength, so that the whole open cut tunnel structure is firstly sealed into a ring, and simultaneously, the whole open cut tunnel lining structure is taken as a pouring template of an external open cut tunnel lining structure of the arch part, namely an outer side arch 4;
step four: and constructing the outer side arch 4 to finish the pouring of the whole open cut tunnel structure.
The invention is not limited to the examples, and any equivalent changes to the technical solution of the invention by a person skilled in the art after reading the description of the invention are covered by the claims of the invention.
Claims (8)
1. Adopt bulky tunnel open cut tunnel structure of pouring step by step, its characterized in that:
the structure comprises two longitudinally parallel bottom longitudinal beams (1), side walls (2) which are constructed in advance are arranged above the bottom longitudinal beams (1), inner side arches (3) are arranged between the tops of the side walls (2) on two sides, outer side arches (4) which are constructed in the later period are arranged above the inner side arches (3), and the side walls (2), the inner side arches (3) and the outer side arches (4) which are constructed in sequence above the bottom longitudinal beams (1) jointly form a circular continuous open cut tunnel structure.
2. The open cut tunnel structure of the large-volume tunnel adopting step casting according to claim 1, wherein:
the top of the side wall (2) is provided with a tongue-and-groove to form a step-shaped structure with a high outer part and a low inner part, and two ends of the inner side arch (3) are connected to the inner side of the top of the side wall (2); both ends of the outer arch (4) are connected to the top outer side of the side wall (2).
3. The open cut tunnel structure of the large-volume tunnel adopting step casting according to claim 2, wherein:
the inner side arch (3) and the outer side arch (4) are constructed in the range of about 120-140 degrees at the top of the open cut tunnel.
4. The open cut tunnel structure of the large-volume tunnel adopting step casting according to claim 3, wherein:
the top surface of the bottom longitudinal beam (1) is exposed with a reserved steel bar joint and a steel bar connector.
5. The open cut tunnel structure of the large-volume tunnel adopting step casting according to claim 4, wherein:
the steel bars at the bottom of the side wall (2) are connected with the reserved steel bar joints at the top surface of the bottom longitudinal beam (1) through steel bar connectors, and the reserved steel bar joints and the steel bar connectors are exposed at the top of the side wall (2).
6. The open cut tunnel structure of the large-volume tunnel adopting step casting according to claim 5, wherein:
the steel bars in the bottoms of the two ends of the inner side arch (3) and the outer side arch (4) are respectively connected with the reserved steel bar joints at the top of the side wall (2) through steel bar connectors.
7. The open cut tunnel structure of the large-volume tunnel adopting step casting according to claim 6, wherein:
the inner side arch (3) which is manufactured in advance is used as a bottom template of the outer side arch (4) which is manufactured in the later period, and the top surface of the inner side arch (3) is roughened in order to enhance the mutual combination of the inner side structure and the outer side structure.
8. The construction method of the large-volume tunnel open cut tunnel structure by adopting step-by-step pouring is characterized by comprising the following steps of:
the method mainly comprises the following steps:
the method comprises the following steps: constructing a bottom longitudinal beam (1) to provide a base support for an upper open cut tunnel structure;
step two: constructing side walls (2) at two sides of the open cut tunnel, and reserving structural tongue-and-groove and connecting steel bars;
step three: constructing an internal lining structure of the open cut tunnel within the arch part range, namely an inner side arch (3), and roughening the surface after the stress strength is achieved, so that the whole open cut tunnel structure is firstly sealed into a ring, and simultaneously, the internal lining structure can be taken as a pouring internal mould of an external open cut tunnel lining structure of the arch part, namely an outer side arch (4);
step four: and constructing the outer side arch (4) to finish the 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 true CN112302684A (en) | 2021-02-02 |
| CN112302684B CN112302684B (en) | 2024-07-09 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0797898A (en) * | 1993-09-28 | 1995-04-11 | Tobishima Corp | Precasted form 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 |
| CN107120119A (en) * | 2017-05-04 | 2017-09-01 | 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 |
| CN110905553A (en) * | 2019-12-05 | 2020-03-24 | 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 |
| 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 |
| 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 |
| 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 |
-
2020
- 2020-10-27 CN CN202011164138.7A patent/CN112302684B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0797898A (en) * | 1993-09-28 | 1995-04-11 | Tobishima Corp | Precasted form 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 |
| CN107120119A (en) * | 2017-05-04 | 2017-09-01 | 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 |
| CN110905553A (en) * | 2019-12-05 | 2020-03-24 | 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 |
| 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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| CN112302684B (en) | 2024-07-09 |
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