CN113463646B - Construction method under complex intersection condition of deep and large foundation pit and shallow tunnel - Google Patents
Construction method under complex intersection condition of deep and large foundation pit and shallow tunnel Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 62
- 238000009412 basement excavation Methods 0.000 claims abstract description 65
- 239000002893 slag Substances 0.000 claims abstract description 28
- 238000007599 discharging Methods 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims description 7
- 239000004567 concrete Substances 0.000 claims description 6
- 239000004575 stone Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 2
- 238000005422 blasting Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- E02D17/02—Foundation pits
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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
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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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
- E02D17/18—Making embankments, e.g. dikes, dams
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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
- E02D29/02—Retaining or protecting walls
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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
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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
- 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
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
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- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a construction method under a complex crossing condition of a deep and large foundation pit and a shallow tunnel, which comprises the steps of adjusting the length and the structural shape of an open cut section; two groups of herringbone slopes are arranged to provide a slag discharging channel for a second lower crossing channel, and an open cut section of the second lower crossing channel is excavated; after the open cut section is exposed, the secondary lining construction is organized in time, and under the condition that the foundation condition of the open cut section secondary lining construction is met, the hole bodies of the two ends of the underground cut sections are excavated and synchronously constructed; backfilling the open cut section immediately after the secondary lining is finished and the strength meets the requirement, and constructing an underground station main body after the backfilling strength meets the requirement; reserving a hole in a triangular area at the front end of the open cut section as a vertical shaft lifting port; and after the excavation of the two underground excavation sections Shan Dong is finished, excavating a conversion pilot tunnel at the end of the large-mileage underground excavation section. The invention can not only ensure the construction safety and quality, but also solve the problems of slow construction period progress and high cost caused by the construction of 'pit in pit and tunnel in pit' with a complex cross structure with a 'top light and bottom dark'.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a construction method under a complex crossing condition of a deep and large foundation pit and a shallow tunnel.
Background
In China, the comprehensive development of underground traffic networks is a current trend, many roads and rails in urban areas are constructed simultaneously, open excavation methods are mostly adopted for constructing rail traffic stations for the construction of new areas without the influence of large building structures, and meanwhile, underground excavation and underpass construction is synchronously carried out aiming at the future traffic construction needs of cities, so that large-scale complex construction operations of upper-layer and lower-layer cross structures such as 'pit-in-pit and tunnel-in-pit' with the upper surface being clear and the lower surface being dark are formed. At present, the internal and external crossing structures are constructed according to the concepts of 'first-down first-up second-up running water operation' and the like, the design and construction of a complex crossing structure built by common rails are relatively more traditional, the design and construction are carried out between the rails and municipal major according to different starting points, the design scheme between the two major is not enough in butt joint, the scheme is overlapped, the investment is wasted, the construction period is long due to successive restriction on the construction time sequence, the municipal road is constructed after the completion of the rails according to the conventional work, the operation of controlling and protecting the rails is related, and the potential safety hazard is obvious.
The second underpass open-cut segment structure shown in fig. 1, wherein the length of the open-cut segment 4 is 35m, and the structure shape is parallelogram. The length of the open cut section 4 is too short, and the construction site arrangement conditions of the large-mileage underground cut section 5 and the small-mileage underground cut section 6 at the two ends cannot be fully met; the secondary lining is mostly of a reinforced concrete structure, the plane of the whole structure is more rectangular, and a parallelogram cannot be used for complete secondary lining, so that the stress requirement of an upper underground station main body (three layers and multiple spans) is difficult to meet; and the excavation section is long and seriously delays the progress of the overall construction period.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a construction method under the complex intersection condition of a deep and large foundation pit and a shallow tunnel, which can ensure the construction safety and quality and solve the problems of slow construction period progress and high cost caused by the construction of a pit-in-pit and a tunnel-in-pit with a complex intersection structure with a 'clear top and dark bottom'.
In order to achieve the above object, the present invention provides a construction method under a complex crossing condition of a deep and large foundation pit and a shallow tunnel, the construction comprises the construction of an underground station main body, a first underpass obliquely crossed or parallel to the underground station main body, and a second underpass crossed with the underground station main body and the first underpass and located at the lowest part of an overall crossing structure, and the bottom of the first underpass is higher than the bottom of the underground station main body, and the construction method comprises the following steps:
dividing an underground station main body into an unfinished section which is influenced by a second lower channel during construction and a constructed section which is not influenced by the second lower channel, and completing the construction of the constructed section;
the second lower lane is of a double-arch structure, the second lower lane is divided into an open excavation section, a large-mileage underground excavation section and a small-mileage underground excavation section, the open excavation section is crossed with the underground station main body, the large-mileage underground excavation section is located at the front end of the open excavation section, the small-mileage underground excavation section is located at the rear end of the open excavation section, the open excavation section is designed to be rectangular along the extending direction, and the open excavation section comprises a parallelogram part overlapped with the underground station main body and also comprises triangular areas at the front end and the rear end;
step three, excavating an open cut section; the method comprises the following steps that a first herringbone slope and a second herringbone slope are arranged at the bottom of a constructed underground station main body and the bottom of a first lower crossing respectively, the first herringbone slope is connected with an open excavation section and the underground station main body, the second herringbone slope is connected with the underground station main body and the first lower crossing, and the first herringbone slope is connected with an existing underground initial slag discharging channel through the second herringbone slope to serve as a slag discharging channel of the second lower crossing;
step four, organizing and constructing an inverted arch and a secondary lining of the open cut section in time after the open cut section is exposed to the bottom, and synchronously excavating a large-mileage underground cut section and a small-mileage underground cut section under the condition that the basic condition of secondary lining construction of the open cut section is met;
after the secondary lining construction of the open excavation section is carried out to the position of the first herringbone slope, dividing the first herringbone slope into an exposed excavation section affected section and an open excavation section unaffected section, breaking the exposed excavation section affected section, changing the broken end into a flat slope, reserving a long-arm excavator slag turning platform, continuously providing a slag discharging effect, and transporting other materials through a tower crane and an automobile crane;
after the secondary lining of the open cut section is finished, breaking a section of the herringbone slope I which is not influenced by the open cut section and the herringbone slope II, backfilling stone slab concrete at the top of the open cut section, reserving a hole in a triangular area at the front end of the open cut section to serve as a vertical shaft lifting port, and constructing a backfilling retaining wall around the reserved hole before backfilling; after the excavation of the two underground excavation sections Shan Dong is finished, excavating a conversion pilot tunnel at the end head of the large-mileage underground excavation section;
seventhly, after the secondary lining and backfilling construction of the open excavation section is completed and the strength meets the requirement, constructing the non-construction section of the main body of the underground station in time; meanwhile, two underground excavation section inverted arches and secondary lining are continuously constructed through a reserved vertical shaft lifting port, and a conversion pilot tunnel reserved in advance is used as a conversion transportation channel of a second lower crossing channel of the double-arch;
and eighthly, according to the peak shifting construction of the actual situation on site, synchronously constructing the inverted arches of the two underground excavation sections, the secondary lining, the auxiliary ditch, the road surface and the underground station main body until the construction is completed, and backfilling stone slab concrete at the lifting port of the vertical shaft after the inverted arches of the two underground excavation sections and the secondary lining are completed.
In the scheme, the method comprises the following steps: and the secondary lining of the open excavation section and the primary support of the two underground excavation sections are simultaneously constructed. The two underground excavation sections are beneficial to ensuring convenient slag discharging of the two underground excavation sections, and before the first herringbone slope is broken, the two underground excavation sections are used for discharging slag as a transportation route through the first herringbone slope, the second herringbone slope and an initial slag discharging channel; after the section of the first herringbone slope affected by the open cut section is broken, and before secondary lining of the open cut section is completed, slag can be discharged from the two underground cut sections through a slag transferring platform of the retained long-arm excavator in the time period; and after the primary support of the two underground excavation sections is finished, excavation residue soil can not be generated.
In the scheme, the method comprises the following steps: the gradient of the first herringbone slope is less than or equal to 13%, and the gradient of the second herringbone slope is less than or equal to 10%. The herringbone slope is used as a slag discharging channel, needs a slow slope, and facilitates the passing of transport vehicles.
In the scheme, the method comprises the following steps: the size of the vertical shaft lifting opening is 8m x 8m, and the size of the conversion pilot tunnel is 5m x 5m. The size of the shaft lifting opening needs to be capable of allowing some materials or mechanical equipment to pass through, and the size of the conversion pilot hole needs to be capable of allowing a transport vehicle to pass through.
In the scheme, the method comprises the following steps: the underground station main body is of a three-layer multi-span structure, and the first lower crossing is of a double-layer double-span structure.
The invention has the beneficial effects that: 1. the length of the open excavation section is increased, a field is provided for the construction of the underground excavation sections at two ends, the length of the underground excavation section is shortened, the project investment is saved, and the total construction period is shortened; 2. the structural shape of the open cut section is adjusted from parallelogram to rectangle, the open cut section can be used for complete secondary lining, and the stress requirement of the main body of the upper underground station can be met; 3. a first herringbone slope and a second herringbone slope are additionally arranged to connect a second lower crossing with different bottom heights, an underground station main body and the first lower crossing, and finally the second herringbone slope is connected with an existing underground initial slag discharging channel, so that a complete slag discharging channel is provided for the second lower crossing, a large number of slag soil transportation conditions are met, and the early construction progress is accelerated; 4. the construction time of the underground station main body is furthest advanced by constructing the secondary lining of the open excavation section in advance, and meanwhile, the constructed secondary lining provides stable support for four sides of a foundation pit of the open excavation section, so that potential safety hazards caused by slope stability due to blasting of the underground excavation section are reduced; 5. a vertical shaft lifting port is reserved in a triangular area at the front end of the open cut section, inverted arches and secondary lining of two underground cut sections can be continuously applied through the vertical shaft lifting port, and a conversion pilot tunnel is excavated at a large-mileage underground cut end to serve as a conversion transportation channel, so that the condition of synchronous construction of an upper underground station main body and a lower underground cut section is created; 6. on the premise of ensuring safety and quality, the total construction period is reduced, and about 20% of the construction period under the same condition can be advanced.
Drawings
Fig. 1 is a layout view before structure adjustment of a second underpass open cut section.
Fig. 2 is a layout diagram of the second underpass open cut section after structure adjustment.
Fig. 3 is a cross-sectional layout of the present invention.
Fig. 4 is a detailed layout of the crossover structure in the present invention.
Detailed Description
As shown in fig. 2-4, a construction method under a complex crossing condition of a deep and large foundation pit and a shallow tunnel includes the construction of an underground station main body 1 (three-layer multi-span), a first lower lane 2 (double-layer double-span) crossing or parallel to the underground station main body 1, and a second lower lane 3 (double-connected arch) crossing the underground station main body 1 and the first lower lane 2 and located at the lowest part of the overall crossing structure, and the bottom of the first lower lane 2 is higher than the bottom of the underground station main body 1, including the following steps:
step one, dividing an underground station main body 1 into an unfinished section 102 which is influenced by a second lower tunnel 3 during construction and a constructed section 101 which is not influenced by the second lower tunnel 3, and completing the construction of the constructed section 101;
dividing the second lower lane 3 into an open cut section 4 crossed with the underground station main body 1, a large-mileage underground cut section 5 positioned at the front end of the open cut section 4 and a small-mileage underground cut section 6 positioned at the rear end of the open cut section 4, wherein the open cut section 4 is designed to be rectangular along the extending direction, and the open cut section 4 comprises a parallelogram part overlapped with the underground station main body 1 and also comprises triangular areas 4a at the front end and the rear end;
step three, excavating the open cut section 4; a first herringbone slope 7 and a second herringbone slope 8 are arranged at the bottom of a constructed underground station main body 1 and the bottom of a first lower crossing 2 respectively, the first herringbone slope 7 is connected with an open excavation section 4 and the underground station main body 1, the second herringbone slope 8 is connected with the underground station main body 1 and the first lower crossing 2, and the first herringbone slope 7 is connected with an existing underground initial slag discharging channel 11 through the second herringbone slope 8 to serve as a slag discharging channel of the second lower crossing 3;
step four, organizing and constructing an inverted arch and a secondary lining of the open cut section 4 in time after the open cut section 4 is exposed to the bottom, and synchronously excavating a large-mileage underground cut section 5 and a small-mileage underground cut section 6 under the condition that the basic condition of secondary lining construction of the open cut section 4 is met;
step five, after the open cut section 4 is subjected to secondary lining construction until the position of the first herringbone slope 7 is located, dividing the first herringbone slope 7 into an open cut section affected section and an open cut section unaffected section, breaking the open cut section affected section, changing the broken end of the open cut section into a flat slope, reserving a long-arm excavator slag turning platform, continuously providing a slag discharging effect, and transporting other materials through a tower crane and a truck crane;
step six, after the secondary lining of the open cut section 4 is finished, breaking a section, not influenced by the open cut section, of the herringbone slope 7 and a section, not influenced by the open cut section, of the herringbone slope 8, backfilling stone concrete at the top of the open cut section 4, reserving holes in a triangular area 4a at the front end of the open cut section 4 to serve as a vertical shaft lifting port 9, and constructing a backfilling retaining wall around the reserved holes before backfilling; after the excavation of the two underground excavation sections Shan Dong is finished, excavating a conversion pilot tunnel 10 at the end of the large-mileage underground excavation section 5;
seventhly, after the secondary lining and backfilling construction of the open cut section 4 is completed and the strength meets the requirement, constructing an unfinished section 102 of the underground station main body 1 in time; meanwhile, two underground excavation section inverted arches and secondary lining are continuously constructed through a reserved vertical shaft lifting port 9, and a conversion pilot tunnel 10 reserved in advance is used as a conversion transportation channel of a double-arch second lower tunnel 3;
and eighthly, according to the peak shifting construction of the actual situation on site, synchronously constructing the inverted arches of the two underground excavation sections, the secondary lining, the auxiliary ditch and the road surface with the underground station main body 1 until all the inverted arches and the secondary lining are completed, and backfilling stone slab concrete in the lifting port 9 of the vertical shaft after the inverted arches of the two underground excavation sections and the secondary lining are completed.
Preferably, the secondary lining of the open cut section 4 and the primary support of the two underground cut sections are completed simultaneously. The two underground excavation sections are beneficial to ensuring convenient slag discharging of the two underground excavation sections, and before the first herringbone slope 7 is broken, the two underground excavation sections discharge slag by taking the first herringbone slope 7, the second herringbone slope 8 and the initial slag discharging channel 11 as a transportation route; after the section affected by the open excavation section of the herringbone slope 7 is broken, and before the secondary lining of the open excavation section 4 is completed, the two underground excavation sections can also discharge slag through a retained slag rotating platform of the long-arm excavator in the time period; and after the primary support of the two underground excavation sections is finished, excavation residue soil can not be generated.
Preferably, the gradient of the first herringbone slope 7 is less than or equal to 13%, and the gradient of the second herringbone slope 8 is less than or equal to 10%. The herringbone slope is used as a slag discharging channel, needs a slow slope, and facilitates the passing of transport vehicles.
Preferably, the size of the shaft elevator 9 is 8m × 8m, and the size of the transfer guide 10 is 5m × 5m. The shaft hoistway lift 9 is sized to allow passage of materials or machinery and the transition guide 10 is sized to allow passage of a transport vehicle.
Claims (5)
1. The construction method comprises the following steps of constructing an underground station main body (1), constructing a first lower lane (2) obliquely or parallel to the underground station main body (1), constructing a second lower lane (3) which is intersected with the underground station main body (1) and the first lower lane (2) and is positioned at the lowest part of an integral intersection structure, and constructing the first lower lane (2) with the bottom higher than the bottom of the underground station main body (1):
the method comprises the following steps of firstly, dividing an underground station main body (1) into an unfinished section (102) influenced by a second lower lane (3) and a constructed section (101) not influenced by the second lower lane (3) during construction, and completing construction of the constructed section (101);
step two, the second lower crossing (3) is of a double arch structure, the second lower crossing (3) is divided into an open cut section (4) crossed with the underground station main body (1), a large-mileage underground cut section (5) positioned at the front end of the open cut section (4), and a small-mileage underground cut section (6) positioned at the rear end of the open cut section (4), the open cut section (4) is designed to be rectangular along the extending direction, and the open cut section (4) comprises a parallelogram part overlapped with the underground station main body (1) and also comprises triangular areas (4 a) at the front end and the rear end;
step three, excavating the open cut section (4); a first herringbone slope (7) and a second herringbone slope (8) are respectively arranged at the bottom of a constructed underground station main body (1) and the bottom of a first underpass (2), the first herringbone slope (7) is connected with an open excavation section (4) and the underground station main body (1), the second herringbone slope (8) is connected with the underground station main body (1) and the first underpass (2), and the first herringbone slope (7) is connected with an existing initial slag discharging channel (11) in the ground through the second herringbone slope (8) to serve as a slag discharging channel of the second underpass (3);
step four, organizing and constructing an inverted arch and a secondary lining of the open cut section (4) in time after the open cut section (4) is exposed to the bottom, and synchronously excavating a large-mileage underground cut section (5) and a small-mileage underground cut section (6) under the condition that the basic condition of secondary lining construction of the open cut section (4) is met;
step five, after the open cut section (4) is subjected to secondary lining construction until the first herringbone slope (7) is located, dividing the first herringbone slope (7) into an open cut section affected section and an open cut section unaffected section, breaking the open cut section affected section, changing the broken end into a flat slope, reserving a long-arm excavator slag turning platform, continuously providing a slag discharging effect, and transporting other materials through a tower crane and a truck crane;
after the secondary lining of the open cut section (4) is completed, a section of the herringbone slope (7) which is not affected by the open cut section and a section of the herringbone slope (8) are removed, stone slab concrete at the top of the open cut section (4) is backfilled, a hole is reserved in a triangular area (4 a) at the front end of the open cut section (4) to serve as a vertical shaft lifting port (9), and a backfilling retaining wall is constructed around the reserved hole before backfilling; after the excavation of the two underground excavation sections Shan Dong is finished, excavating a conversion pilot tunnel (10) at the end of the large-mileage underground excavation section (5);
seventhly, after the secondary lining and backfilling construction of the open cut section (4) is completed and the strength meets the requirement, constructing an unfinished section (102) of the main body (1) of the underground station in time; meanwhile, two underground excavation section inverted arches and secondary lining are continuously constructed through a reserved vertical shaft lifting port (9), and a conversion pilot tunnel (10) reserved in advance is used as a conversion transportation channel of a double-arch second underpass (3);
and eighthly, according to the peak shifting construction of the actual situation on site, synchronously constructing the inverted arches of the two underground excavation sections, the secondary lining, the auxiliary ditch, the road surface and the underground station main body (1) until all the inverted arches and the secondary lining are completed, and backfilling stone slab concrete to the lifting opening (9) of the vertical shaft after the inverted arches of the two underground excavation sections and the secondary lining are completed.
2. The construction method of the deep and large foundation pit and the shallow tunnel under the complex intersection condition according to claim 1, characterized in that: and the secondary lining of the open excavation section (4) and the primary support of the two underground excavation sections are simultaneously constructed.
3. The construction method of the deep and large foundation pit and the shallow tunnel under the complex intersection condition according to claim 1, characterized in that: the gradient of the first herringbone slope (7) is less than or equal to 13%, and the gradient of the second herringbone slope (8) is less than or equal to 10%.
4. The construction method of the deep and large foundation pit and the shallow tunnel under the complex intersection condition according to claim 1, characterized in that: the size of the vertical shaft lifting opening (9) is 8m x 8m, and the size of the conversion pilot tunnel (10) is 5m x 5m.
5. The construction method of the deep and large foundation pit and the shallow tunnel under the complex intersection condition according to claim 1, characterized in that: the underground station main body (1) is of a three-layer multi-span structure, and the first lower lane (2) is of a double-layer double-span structure.
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| JP4229880B2 (en) * | 2004-06-18 | 2009-02-25 | 前田建設工業株式会社 | Tunnel formation method |
| CN101775987B (en) * | 2010-02-02 | 2012-02-22 | 北京交通大学 | Zero spacing construction method for overlapping part of upper main tunnel and lower main tunnel of underground overpass |
| CN203321533U (en) * | 2013-06-19 | 2013-12-04 | 天津市市政工程设计研究院 | Small angle intersection support structure for overlapping tunnels |
| CN104533426B (en) * | 2014-11-10 | 2016-09-14 | 中铁第四勘察设计院集团有限公司 | An ultra shallow buries the method for tunnel construction of underpass of freeways large span cap excavation method |
| CN106567717B (en) * | 2015-10-10 | 2019-03-05 | 中铁第六勘察设计院集团有限公司 | It is a kind of to double as construction access ramp structure and construction method using subway entrance |
| CN106907161B (en) * | 2017-04-28 | 2019-02-12 | 中铁二十二局集团第五工程有限公司 | A kind of tunnel slope caunches special construction method |
| CN107218045B (en) * | 2017-07-03 | 2019-03-26 | 中车建设工程有限公司 | The rapid constructing method of rocky stratum tunneling subway station entrance tunneling section |
| CN111236949B (en) * | 2020-01-17 | 2021-08-06 | 中铁二院工程集团有限责任公司 | Small-angle cross tunnel construction method |
| CN112682062B (en) * | 2020-12-31 | 2023-08-25 | 中铁大桥局集团第五工程有限公司 | Construction method of small-clear-distance stereo cross tunnel |
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