CN111197315A - Composite column structure for subway station and construction method - Google Patents
Composite column structure for subway station and construction method Download PDFInfo
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- CN111197315A CN111197315A CN202010114109.3A CN202010114109A CN111197315A CN 111197315 A CN111197315 A CN 111197315A CN 202010114109 A CN202010114109 A CN 202010114109A CN 111197315 A CN111197315 A CN 111197315A
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- 239000002131 composite material Substances 0.000 title claims abstract description 40
- 238000010276 construction Methods 0.000 title claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 36
- 239000010959 steel Substances 0.000 claims abstract description 36
- 239000004567 concrete Substances 0.000 claims description 46
- 239000010410 layer Substances 0.000 claims description 34
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 21
- 238000005452 bending Methods 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 5
- 238000004873 anchoring Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 210000003205 muscle Anatomy 0.000 claims description 4
- 239000011241 protective layer Substances 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 239000004576 sand Substances 0.000 claims description 2
- 239000013049 sediment Substances 0.000 claims description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011178 precast concrete Substances 0.000 description 2
- 238000009417 prefabrication Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 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
- 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
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention discloses a composite column structure for a subway station and a construction method, wherein the composite column structure comprises a prefabricated stand column and a post-cast superposed layer, and the prefabricated stand column is used as an inner supporting stand column for replacing a temporary lattice column in a deep foundation pit of the station; the prefabricated stand column is internally provided with a steel bar connector, connecting steel bars are embedded around the prefabricated stand column, a post-pouring superposed layer is arranged on the periphery of the prefabricated stand column, and the prefabricated stand column and the post-pouring superposed layer are superposed through the embedded connecting anchor bars so as to form a composite column structure to serve as a permanent structural column to bear force. The invention effectively shortens the construction period, saves the construction cost and has strong popularization value by adopting the composite column structure that the prefabricated upright column is also used as the column core of the permanent structure column.
Description
Technical Field
The invention relates to the technical field of underground engineering, in particular to a composite column structure for a subway station and a construction method.
Background
Along with the continuous development of society, the urban underground space field is continuously developed, in the engineering construction of underground stations, an open cut method is widely used as a traditional construction method, for some complicated foundation pits or foundation pits with large span, a middle upright post is generally arranged at the position of a horizontal concrete support with large stress, and the safety of a foundation pit enclosure structure is ensured.
At present, the multipurpose 'temporary inner support + temporary latticed column' type in the open cut method foundation pit has the following defects:
1) the lattice column and the inner support are generally dismantled after the main structure is completed, so that the construction period is long, and the construction cost is not saved;
2) the positions of the lattice columns can become the impervious weak points of the base plate, and water seepage paths can be formed at the peripheries of the lattice columns to influence the impervious performance of the base plate of the station.
Disclosure of Invention
The invention aims to provide a composite column structure for a subway station and a construction method, and the composite column structure has the advantages that the construction period is effectively shortened and the construction cost is saved by using a prefabricated stand column as a permanent structure column core.
In order to achieve the purpose, the concrete technical scheme of the composite column structure for the subway station and the construction method is as follows:
a composite column structure for a subway station comprises a prefabricated stand column and a post-cast superposed layer, wherein the prefabricated stand column is used as an inner supporting stand column for replacing a temporary lattice column in a deep foundation pit of the station; the prefabricated stand column is internally provided with a steel bar connector, connecting steel bars are embedded around the prefabricated stand column, a post-pouring superposed layer is arranged on the periphery of the prefabricated stand column, and the prefabricated stand column and the post-pouring superposed layer are superposed through the embedded connecting anchor bars so as to form a composite column structure to serve as a permanent structural column to bear force.
A construction method of a composite column structure for a subway station includes:
step one, manufacturing a stand column outside a construction site in an industrial manner;
drilling and cleaning holes at the column position;
thirdly, hoisting a prefabricated upright post pile reinforcement cage, installing the prefabricated upright post in the hole, and inserting the upright post pile for 4-6 m;
pouring upright post pile concrete below the pit bottom of the foundation pit, and filling the gap between the prefabricated upright post and the drilled hole with sand stones;
fifthly, after other building enclosures are completed, excavating a foundation pit, and excavating the foundation pit to the bottom elevation position of the top longitudinal beam;
step six, dismantling the upper temporary lattice column, bending the exposed reinforcing steel bars at the top end of the prefabricated stand column, binding the reinforcing steel bars of the concrete connecting beam, and pouring the concrete connecting beam;
step seven, pouring a first concrete slab support, and continuously excavating and erecting a steel support;
step eight, after excavating a foundation pit to a designed elevation and applying a waterproof layer of a bottom plate, chiseling prefabricated upright post protective layers from bottom to top in sequence, straightening connecting reinforcing steel bars, welding connecting anchor bars and post-cast laminated layer main reinforcing steel bars, connecting the upper ends of the post-cast laminated layer main reinforcing steel bars through reinforcing steel bar connectors embedded in concrete connecting beams, and performing bending anchoring at the lower ends of the post-cast laminated layer main reinforcing steel bars;
and step nine, pouring concrete of the post-pouring laminated layer, and forming a composite column structure with the prefabricated stand column.
The composite column structure for the subway station and the construction method have the advantages that:
1) the construction cost, the construction period, the waterproof effect and the column stress performance are combined, the construction period is effectively shortened through the composite column structure that the prefabricated upright column is also used as the column core of the permanent structure column, the construction cost is saved, and the popularization value is very high;
2) the precast concrete upright column, the bottom beam and the bottom plate are cast into a whole, so that the impermeability of the bottom plate at the joint of the temporary steel lattice column is improved;
3) the composite column has improved stress performance compared with the common cast-in-situ concrete column and has stronger market competitiveness.
Drawings
FIG. 1 is a schematic elevation view of a composite post structure of the present invention;
FIG. 2 is a layout view of reinforcing bars of the composite column structure of the present invention;
FIG. 3 is a schematic view of a composite column structure and roof beam joint of the present invention;
FIG. 4 is a schematic view of a composite column structure and a middle plate beam node according to the present invention;
FIG. 5 is a schematic view of a composite pillar structure and floor beam junction of the present invention.
In the figure: 1. prefabricating a stand column; 2. post-pouring a superposed layer; 3. a concrete tie beam; 4. post-casting the top longitudinal beam; 5. a temporary steel lattice column; 6. concrete slab bracing (doubling as a permanent roof); 7. a steel bar connector; 8. connecting anchor bars; 9. a vertical column pile; 10. and (5) post-pouring a top plate.
Detailed Description
In order to better understand the purpose, structure and function of the present invention, a composite column structure and a construction method for a subway station according to the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 5, which illustrate a composite column structure for a subway station and a construction method according to the present invention, the composite column structure includes a prefabricated vertical column 1, a post-cast laminated layer 2, a concrete connecting beam 3, a post-cast roof longitudinal beam 4, a temporary lattice column 5, a steel bar connector 7, a connecting anchor bar 8, and a vertical column pile 9. The section of the prefabricated upright post 1 adopts 400x400 mm. According to the invention, the prefabricated upright column 1 is used as an inner supporting upright column of a deep foundation pit of a station to replace a traditional temporary lattice column, a beam, a plate steel bar connector and connecting steel bars are pre-embedded in the prefabricated upright column 1 in a prefabrication stage, after the foundation pit is finished, the prefabricated upright column 1 is used as a column core of a permanent structural column, the steel bars are arranged on the outer side of the prefabricated upright column 1, a superposed layer 2 is poured after construction, and the prefabricated upright column 1 is superposed through connecting anchor bars 8 to form a composite column structure which is used as a permanent structural column to bear force.
Particularly, the prefabricated upright columns 1 are respectively provided with reinforcing steel bar connectors 7 on the bottom of the concrete connecting beam, the upper side and the lower side of the position level of the bottom plate beam and the middle plate beam, and the number, specification and interval of the reinforcing steel bar connectors 7 are consistent with those of beam stressed reinforcing steel bars. The cast-in-place top longitudinal beam is embedded with reinforcing bar connectors 7 at the bottom side of the column position, and the number, specification and spacing of the connectors are consistent with those of main bars of the post-cast laminated layer 2.
Further, prefabricated stand 1 and 5 fixed connection of interim steel lattice column, interim steel lattice column 5 sets up 12d (d is the main muscle diameter of prefabricated stand 1) distance more than concrete tie beam 3, and with the reinforcing bar welding of prefabricated stand 1 together, interim steel lattice column 5 stretches out ground 1m to the hoist and mount and the accurate positioning of prefabricated stand 1. As shown in fig. 3 to 5, the prefabricated vertical column 1 is respectively constructed with a top plate beam node, a middle plate beam node and a bottom plate beam node. As shown in fig. 4 and 5, the prefabricated upright post 1 is connected with the prefabricated upright post 1 through welding and fixing according to the node structure and the designed elevation pre-buried beam and the plate steel bar connector.
Further, the upper part of the precast upright post 1 is provided with a concrete coupling beam 3 and a concrete slab support 6. Particularly, excavation of the foundation pit is to the elevation at the bottom of the concrete connecting beam 3, the temporary steel lattice column 5 is removed, the steel bars exposed from the top end of the prefabricated stand column 1 are bent, the anchoring length of the column is met, the steel bars of the concrete connecting beam 3 are bound, the concrete connecting beam 3 is poured, and the steel bar connector 7 of the post-pouring laminated layer 2 is reserved. When the stirrups of the concrete connecting beam 3 are arranged, the stirrups need to extend out of the top surface of the beam, the superposition condition of the post-cast roof longitudinal beam 4 is reserved, and finally the concrete connecting beam and the post-cast roof longitudinal beam are integrated. In addition, a first concrete slab support 6 (also used as a permanent top plate) is poured, and steel supports are erected by continuously excavating.
Further, post-cast laminated layer 2 is located the outside of prefabricated stand 1, and through connecting anchor 8 with prefabricated stand 1, post-cast laminated layer 2 superpose together. The connecting anchor bars 8 of the prefabricated upright posts 1 are bent into the protective layer at the prefabrication stage, chiseled and straightened when the post-cast laminated layer 2 is constructed, and anchored into the peripheral reinforced concrete and welded with the main bars of the post-cast laminated layer 2. Specifically, as shown in fig. 2, a post-cast laminated layer 2 is sequentially constructed from bottom to top and is laminated with a prefabricated upright post 1 to form a composite post structure. As shown in fig. 4, the steel bars of the middle plate girder and the middle plate main steel bar are not continuous when meeting the prefabricated upright post 1, but are communicated through the pre-embedded steel bar connector 7. As shown in fig. 5, after the excavation of foundation ditch was accomplished, carried out surperficial chisel hair to prefabricated stand 1 by supreme down in proper order, will connect anchor bar 8 to chisel out and straighten, connect anchor bar 8 and the welding of post-cast lamination layer 2 owner muscle firm, the reinforcing bar was continuous when bottom plate roof beam and bottom plate owner muscle met prefabricated stand 1, also was through pre-buried reinforcing bar connector 7 UNICOM.
Further, the reinforcing steel bars of the post-cast laminated layer 2 are connected with a reinforcing steel bar connector 7 in the concrete connecting beam 3, and a post-cast top longitudinal beam 4 and a post-cast top plate 10 are fixedly arranged at the top of the prefabricated upright post 1. Specifically, as shown in fig. 3, the top ends of the steel bars of the post-cast laminated layer 2 are connected with a steel bar connector 7 pre-embedded in the concrete connecting beam 3 in advance, and finally, the post-cast roof longitudinal beam 4 and the post-cast roof plate 10 are constructed.
The invention also discloses a construction method of the composite column structure for the subway station, which comprises the following steps:
step one, manufacturing the prefabricated upright post 1 outside a construction site in an industrial manner according to requirements.
And step two, drilling and cleaning holes at the column position.
Wherein, hole inspection is carried out once every drilling depth is 4-5 m, and the hole inspection is carried out before the drill bit is replaced or the hole is easy to shrink; the pile position allowable deviation is not more than 30mm, the pile diameter allowable deviation is +/-50 mm, the verticality allowable deviation is not more than 1/200, and the sediment thickness is not more than 50 mm.
And step three, hoisting a reinforcement cage of the prefabricated upright post pile 9, installing the prefabricated upright post 1 in the hole, and inserting the upright post pile for 4-6 m (preferably 5 m).
Wherein, the construction precision of prefabricated stand 1 is controlled strictly, and its construction deviation should accord with following regulation: the allowable deviation of the axis of the prefabricated upright post 1 is controlled within +/-10 mm, the plane positioning error is not more than +/-10 mm, the elevation is controlled within +/-10 mm, the allowable deviation of the verticality is not more than 1/500, the insertion depth is strictly controlled, and the error is not more than 10 mm.
And fourthly, pouring concrete of the upright post pile 9 below the pit bottom of the foundation pit, and filling the gap between the prefabricated upright post 1 and the drilled hole with gravel.
And fifthly, after other building enclosures are completed, excavating the foundation pit, and excavating the foundation pit to the bottom elevation position of the top longitudinal beam.
And step six, dismantling the upper temporary steel lattice column 5, bending the exposed reinforcing steel bars at the top end of the prefabricated upright column 1, binding the reinforcing steel bars of the concrete connecting beam 3, and pouring the concrete connecting beam 3.
When the stirrups of the concrete connecting beam 3 are arranged, the stirrups need to extend out of the top surface of the beam, the superposition condition of the post-cast roof longitudinal beam 4 is reserved, and finally the concrete connecting beam and the post-cast roof longitudinal beam are integrated.
And seventhly, pouring the first concrete slab support 6 (also used as a permanent top plate), and continuously excavating and erecting the steel support.
And step eight, after excavating the foundation pit to a designed elevation and applying a waterproof layer of the bottom plate, chiseling the prefabricated stand column protective layers from bottom to top in sequence, straightening the connecting anchor bars 8, welding the connecting anchor bars 8 and the main bars of the post-cast laminated layer 2, connecting the upper ends of the main bars of the post-cast laminated layer 2 through the steel bar connector 7 pre-buried in the concrete connecting beam 3, and bending and anchoring the lower ends of the main bars in a conventional mode.
And step nine, pouring concrete of the post-pouring laminated layer 2, and forming a composite column structure with the prefabricated upright column 1.
The composite column structure and the construction method for the subway station combine the manufacturing cost, the construction period, the waterproof effect and the column stress performance, effectively shorten the construction period, save the engineering cost and have strong popularization value by the composite column structure that the prefabricated upright column is also used as the column core of the permanent structure; the precast concrete upright columns, the bottom plate beam and the bottom plate are cast into a whole, so that the impermeability of the bottom plate at the joints of the temporary steel lattice column is improved; the composite column has improved stress performance compared with the common cast-in-situ concrete column and has stronger market competitiveness.
The present invention has been further described with reference to specific embodiments, but it should be understood that the detailed description should not be construed as limiting the spirit and scope of the present invention, and various modifications made to the above-described embodiments by those of ordinary skill in the art after reading this specification are within the scope of the present invention.
Claims (9)
1. The composite column structure for the subway station is characterized by comprising a prefabricated upright column (1) and a post-cast laminated layer (2), wherein the prefabricated upright column (1) is used as an inner supporting upright column for replacing a temporary lattice column in a deep foundation pit of the station; be provided with reinforcing bar connector (7) in prefabricated stand (1), pre-buried connecting reinforcement (8) around prefabricated stand (1), the periphery of prefabricated stand (1) is provided with post-cast laminated layer (2), superposes prefabricated stand (1) and post-cast laminated layer (2) mutually through pre-buried connecting anchor muscle (8) to form composite column structure and regard as permanent structure post atress.
2. The composite column structure according to claim 1, wherein the steel bar connectors (7) are respectively provided at the bottom of the concrete connecting beam (3) and at the upper and lower sides of the positions of the bottom plate beam and the middle plate beam.
3. The composite column structure according to claim 1, wherein the prefabricated columns (1) are fixedly connected with temporary steel lattice columns (5), the temporary steel lattice columns (5) being arranged above the concrete tie beams (3).
4. A composite column structure according to claim 1, characterized in that the upper part of the prefabricated upright (1) is provided with concrete tie beams (3) and concrete slab bracing (6).
5. The composite column structure according to claim 1, characterized in that the steel bars of the post-cast laminated layer (2) are connected with the steel bar connectors (7) in the concrete connecting beam (3), and the top of the prefabricated column (1) is fixedly provided with a post-cast top longitudinal beam (4) and a post-cast top plate (10).
6. A construction method of a composite column structure for a subway station is characterized by comprising the following steps:
step one, manufacturing a stand column outside a construction site in an industrial manner;
drilling and cleaning holes at the column position;
thirdly, hoisting a prefabricated upright post pile reinforcement cage, installing the prefabricated upright post in the hole, and inserting the upright post pile for 4-6 m;
pouring upright post pile concrete below the pit bottom of the foundation pit, and filling the gap between the prefabricated upright post and the drilled hole with sand stones;
fifthly, after other building enclosures are completed, excavating a foundation pit, and excavating the foundation pit to the bottom elevation position of the top longitudinal beam;
step six, dismantling the upper temporary lattice column, bending the exposed reinforcing steel bars at the top end of the prefabricated stand column, binding the reinforcing steel bars of the concrete connecting beam, and pouring the concrete connecting beam;
step seven, pouring a first concrete slab support, and continuously excavating and erecting a steel support;
step eight, after excavating a foundation pit to a designed elevation and applying a waterproof layer of a bottom plate, chiseling prefabricated upright post protective layers from bottom to top in sequence, straightening connecting reinforcing steel bars, welding connecting anchor bars and post-cast laminated layer main reinforcing steel bars, connecting the upper ends of the post-cast laminated layer main reinforcing steel bars through reinforcing steel bar connectors embedded in concrete connecting beams, and performing bending anchoring at the lower ends of the post-cast laminated layer main reinforcing steel bars;
and step nine, pouring concrete of the post-pouring laminated layer, and forming a composite column structure with the prefabricated stand column.
7. The construction method according to claim 6, wherein in step two: checking the hole once every 4-5 m of drilling depth, and checking the hole before replacing the drill bit or easily shrinking the hole; the pile position allowable deviation is not more than 30mm, the pile diameter allowable deviation is +/-50 mm, the verticality allowable deviation is not more than 1/200, and the sediment thickness is not more than 50 mm.
8. The construction method according to claim 6, wherein in step three: the construction precision of the prefabricated stand column is strictly controlled, and the construction deviation of the prefabricated stand column meets the following regulations: the allowable deviation of the axis of the prefabricated upright post is controlled within +/-10 mm, the plane positioning error is not more than +/-10 mm, the elevation is controlled within +/-10 mm, the allowable deviation of the verticality is not more than 1/500, the insertion depth is strictly controlled, and the error is not more than 10 mm.
9. The construction method according to claim 6, wherein in step six: when the concrete connecting beam stirrups are arranged, the stirrups need to extend out of the top surfaces of the beams, the post-cast top longitudinal beam overlapping condition is reserved, and finally the concrete connecting beam stirrups and the post-cast top longitudinal beam form a whole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010114109.3A CN111197315A (en) | 2020-02-24 | 2020-02-24 | Composite column structure for subway station and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010114109.3A CN111197315A (en) | 2020-02-24 | 2020-02-24 | Composite column structure for subway station and construction method |
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| CN111197315A true CN111197315A (en) | 2020-05-26 |
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| CN202010114109.3A Pending CN111197315A (en) | 2020-02-24 | 2020-02-24 | Composite column structure for subway station and construction method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114352326A (en) * | 2022-01-24 | 2022-04-15 | 中铁工程装备集团有限公司 | Assembled subway station and construction method thereof |
| CN114457810A (en) * | 2022-01-26 | 2022-05-10 | 中铁第一勘察设计院集团有限公司 | Foundation pit inner support system based on permanent-temporary combination and construction method thereof |
| CN114809015A (en) * | 2022-05-11 | 2022-07-29 | 中铁第六勘察设计院集团有限公司 | Construction method for combining temporary support system and permanent structure of open-cut subway station |
| CN115217121A (en) * | 2022-08-24 | 2022-10-21 | 广东省建筑设计研究院有限公司 | Cooperative stress system and method for assembly type steel-concrete enclosure support and main body structure |
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| CN110761329A (en) * | 2019-10-25 | 2020-02-07 | 中铁第四勘察设计院集团有限公司 | Segmented construction method for mud-water balance open caisson station in soft soil area |
| CN212175803U (en) * | 2020-02-24 | 2020-12-18 | 中铁第六勘察设计院集团有限公司 | Composite column structure for subway station |
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| KR20080108880A (en) * | 2007-06-11 | 2008-12-16 | 이창남 | Trench forme method for the steel concrete column |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114352326A (en) * | 2022-01-24 | 2022-04-15 | 中铁工程装备集团有限公司 | Assembled subway station and construction method thereof |
| CN114457810A (en) * | 2022-01-26 | 2022-05-10 | 中铁第一勘察设计院集团有限公司 | Foundation pit inner support system based on permanent-temporary combination and construction method thereof |
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