CN210658442U - Roof plate upturning beam structure of subway station - Google Patents
Roof plate upturning beam structure of subway station Download PDFInfo
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- CN210658442U CN210658442U CN201921072797.0U CN201921072797U CN210658442U CN 210658442 U CN210658442 U CN 210658442U CN 201921072797 U CN201921072797 U CN 201921072797U CN 210658442 U CN210658442 U CN 210658442U
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Abstract
The utility model belongs to the field of underground engineering construction, and relates to a roof upturning beam structure of a subway station, which comprises an upcast beam which is poured firstly and an upcast beam which is poured later, wherein at least part of the upcast beam is positioned in the roof of the station; the first concrete support above the first cast-in-place beam is chiseled after the position, corresponding to the first cast-in-place beam, of the station top plate reaches the designed strength, the post-cast in-place beam is arranged on the first cast-in-place beam, and the post-cast in-place beam vertically penetrates through the first concrete support; a first U-shaped stirrup is reserved on the first-cast upturning beam, and at least part of the first U-shaped stirrup extends out of the first-cast upturning beam; and a second U-shaped stirrup is arranged in the post-cast upper turning beam, and the first U-shaped stirrup and the second U-shaped stirrup are positioned and connected in the post-cast upper turning beam. The utility model discloses to turn over the roof beam on and divide twice pouring shaping, can effectively solve present subway station roof and turn over the roof beam on and overlap the construction difficulty problem that leads to with first concrete support space.
Description
Technical Field
The utility model belongs to the technical field of the construction of track traffic underground works, concretely relates to roof beam structure turns over on subway station roof.
Background
In order to meet the anti-floating requirement of the underground station of the subway and reduce the construction cost, the first concrete support is usually pressed down properly in the design; in order to meet the requirements of effective space areas of station hall layers of related specialties such as buildings, heating ventilation and the like, the longitudinal beam on the top of a station is generally required to be turned upwards; the first concrete support is pressed downwards and can be overlapped with the spatial position of the upturned top longitudinal beam, so that the construction is difficult. If support the structure roof beam of pouring by force, then have following four problems: firstly, a support beam is directly broken off without constructing a station roof, the axial force of a first concrete support is large, the first concrete support cannot normally transfer force after being broken off, and the safety and stability of a foundation pit are seriously influenced; secondly, the top plate of the station is not constructed in the concrete support breaking process, only scaffolds can be erected in the breaking process, and large soil bodies and steel bars have great influence on the template and the support in the support breaking process, so that great potential safety hazards are generated; and (III) after the first concrete support is broken, the negative layer side wall is subjected to larger soil body side pressure, and stress cracks are easily caused to the side wall. Aiming at the problem of overlapping of spatial position relations of a first concrete support and an upturning beam, a common solution is to reduce the upturning height of the upturning beam and make the upturning beam into a half of a turn-down and a half of a turn-up, so that on one hand, the effective height of a station hall layer in a station can be reduced, and on the other hand, even if the first concrete support is avoided, enough space is hardly reserved for binding the reinforcing steel bars of the beam and pouring concrete.
Disclosure of Invention
In order to overcome the not enough of above-mentioned prior art existence, the utility model aims at providing a subway station roof turns over roof beam structure on, can solve current subway station roof effectively and turn over roof beam and the conflicted problem of first concrete support on.
In order to achieve the purpose, the technical scheme of the utility model is a roof plate upturning beam structure of a subway station, which comprises an up-turned beam which is poured firstly and an up-turned beam which is poured later, wherein at least part of the up-turned beam which is poured firstly is positioned in the roof plate of the station; the first concrete support above the first cast-in-place beam is chiseled after the position, corresponding to the first cast-in-place beam, of the station top plate reaches the designed strength, the post-cast in-place beam is arranged on the first cast-in-place beam, and the post-cast in-place beam vertically penetrates through the first concrete support; a first U-shaped stirrup is reserved on the first-cast upturning beam, and at least part of the first U-shaped stirrup extends out of the first-cast upturning beam; and a second U-shaped stirrup is arranged in the post-cast upper turning beam, and the first U-shaped stirrup and the second U-shaped stirrup are positioned and connected in the post-cast upper turning beam.
Furthermore, the bottom of the first U-shaped stirrup is positioned in the pre-cast upturning beam, and two side edges of the first U-shaped stirrup extend out of the pre-cast upturning beam and extend into the post-cast upturning beam to be connected with the second U-shaped stirrup in a positioning manner.
Furthermore, all add on the both sides edge of first U type stirrup and have many first muscle of indulging, the first muscle of indulging on one of them side of first U type stirrup and the first muscle of indulging on the opposite side edge pass through first lacing wire fixed connection.
Furthermore, the U-shaped opening of the second U-shaped stirrup is opposite to the U-shaped opening of the first U-shaped stirrup, and two side edges of the second U-shaped stirrup are respectively connected with two side edges of the first U-shaped stirrup in a positioning manner.
Furthermore, one side of each side edge of the first U-shaped stirrup is short, one side of each side edge of the second U-shaped stirrup is short, and the long side edge and the short side edge of the first U-shaped stirrup are respectively connected with the short side edge and the long side edge of the second U-shaped stirrup in a positioning manner.
Furthermore, a plurality of second longitudinal bars are attached to both sides of the second U-shaped stirrup, and the second longitudinal bar on one side of the second U-shaped stirrup is fixedly connected to the second longitudinal bar on the other side of the second U-shaped stirrup through a second tie bar.
Furthermore, a third U-shaped stirrup is further arranged in the U-shaped opening of the first U-shaped stirrup, and two side edges of the third U-shaped stirrup extend out of the first cast-on turning beam and extend into the second cast-on turning beam.
Furthermore, a fourth U-shaped stirrup is further arranged in the U-shaped opening of the second U-shaped stirrup, and the U-shaped opening of the fourth U-shaped stirrup is opposite to the U-shaped opening of the third U-shaped stirrup; and two side edges of the fourth U-shaped stirrup are respectively connected with two side edges of the third U-shaped stirrup in a positioning manner.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) compared with the existing structural method for solving the conflict between the top turning beam of the top plate of the subway station and the first concrete support, the top turning beam structure of the top plate of the subway station provided by the utility model has the advantages that the top turning beam is cast and formed twice, the effective height of a station hall layer can be ensured, the reinforcement binding quality of the top turning beam and the construction space of the concrete of the post-cast top turning beam can be ensured, the construction difficulty is greatly reduced, and the conflict problem between the top turning beam of the top plate of the subway station and the first concrete support can be effectively solved;
(2) the utility model provides a subway station roof turns over roof beam structure on can guarantee that before breaking first concrete support, the station roof replaces first concrete support and plays the supporting role, maintains the safety and stability of station foundation ditch; the roof upturning beam can be constructed according to design requirements on the premise of ensuring the safety of the foundation pit support structure;
(3) the utility model provides an it waters earlier among the roof beam structure of turning over on the roof beam and waters after in the subway station roof board and turn over the corresponding U type stirrup of turning over the roof beam and seal to turn over on the roof beam, forms the confined roof beam stirrup that turns over on, and structure way safe and reliable, and the construction is simple, and economical and practical has better application prospect in the underground works field.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of a roof upturning beam structure of a subway station provided by an embodiment of the utility model;
fig. 2 is a schematic view of a roof upturning beam structure of a subway station provided by the embodiment of the utility model;
fig. 3 is a schematic view of a roof upturning beam structure of a subway station provided by the embodiment of the utility model;
in the figure: 1. retaining wall, 2, crown beam, 3, micro-expansion concrete, 4, ground connecting wall, 5, station roof, 6, first concrete support, 7, upturning beam, 8, first cast-up beam, 9, first U-shaped stirrup, 10, first longitudinal bar, 11, first tie bar, 12, third U-shaped stirrup, 13, third longitudinal bar, 14, later cast-up beam, 15, second U-shaped stirrup, 16, second longitudinal bar, 17, second tie bar, 18, fourth U-shaped stirrup, 19, fourth longitudinal bar, 20, U-shaped stirrup joint, 21, new and old concrete interface.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1-3, an embodiment of the present invention provides a roof upturning beam structure of a subway station, which includes an upturning beam 8 poured first and an upturning beam 14 poured later, wherein the upturning beam 8 poured first is at least partially located in the station roof 5; the first concrete support 6 above the first cast-in upturned beam 8 is chiseled after the station top plate 5 reaches the design strength corresponding to the position of the first cast-in upturned beam 8, the later cast-in upturned beam 14 is arranged on the first cast-in upturned beam 8, and the later cast-in upturned beam 14 vertically penetrates through the first concrete support 6; a first U-shaped stirrup 9 is reserved on the first-poured upper turning beam 8, and at least part of the first U-shaped stirrup 9 extends out of the first-poured upper turning beam 8; and a second U-shaped stirrup 15 is arranged in the post-cast upturning beam 14, and the part of the first U-shaped stirrup 9 extending out of the pre-cast upturning beam 8 is connected with the second U-shaped stirrup 15 in the post-cast upturning beam 14 in a positioning manner. The utility model divides the upturning beam 7 into a first cast upturning beam 8 and a second cast upturning beam 14, the first cast upturning beam 8 is cast first, the station roof 5 replaces the first concrete support 6 to play a supporting role, and the safety and stability of the station foundation pit are maintained; when the post-construction cast-on turning beam 14 is poured, an opening can be chiseled on the first concrete support 6 after the station roof 5 reaches the design strength, then reinforcing steel bars are bound and concrete is poured, so that the effective height of a station hall layer can be ensured, the binding quality of the reinforcing steel bars of the cast-on turning beam 7 and the construction space of the concrete of the post-construction cast-on turning beam 14 can be ensured, the construction difficulty is greatly reduced, the problem that the existing cast-on turning beam 7 of the subway station roof 5 conflicts with the first concrete support 6 can be effectively solved, and the post-construction cast-on turning beam is suitable for the underground engineering field of rail transit and; and the first U-shaped stirrup 9 and the second U-shaped stirrup 15 are positioned and connected in the post-cast upturning beam 14, so that the integrity of the upturning beam 7 is improved.
Specifically, as shown in fig. 2, the bottom of the first U-shaped stirrup 9 is located in the first-poured upturned beam 8, and the two side edges extend out of the first-poured upturned beam 8 and extend into the second-poured upturned beam 14 to be connected with the second U-shaped stirrup 15 in a positioning manner, so that the connection strength between the first-poured upturned beam 8 and the second-poured upturned beam 14 is improved. Furthermore, a plurality of first longitudinal ribs 10 are respectively attached to two side edges of the first U-shaped stirrup 9, and the first longitudinal rib 10 on one side edge of the first U-shaped stirrup 9 is connected with the corresponding first longitudinal rib 10 on the other side edge through a first tie bar 11. A plurality of first U-shaped stirrups 9 are arranged along the length direction of the underground station, and each first longitudinal bar 10 is connected with the plurality of first U-shaped stirrups 9.
Further, as shown in fig. 3, a U-shaped opening of the second U-shaped stirrup 15 is disposed opposite to a U-shaped opening of the first U-shaped stirrup 9, and two side edges of the second U-shaped stirrup 15 are respectively connected to two side edges of the first U-shaped stirrup 9 in a positioning manner. In the embodiment, the joints of the first U-shaped stirrup 9 and the second U-shaped stirrup 15 are welded to form the closed stirrup of the upturned beam 7, so that the requirement on earthquake resistance is met. Preferably, one side of each side edge of the first U-shaped stirrup 9 is long and the other side of each side edge of the second U-shaped stirrup 15 is short, and the long side edge and the short side edge of the first U-shaped stirrup 9 are respectively connected with the short side edge and the long side edge of the second U-shaped stirrup 15 in a positioning manner, so that the strength of the joint welding position of the first U-shaped stirrup 9 and the second U-shaped stirrup 15 is improved.
Furthermore, as shown in fig. 3, a plurality of second longitudinal ribs 16 are attached to both side edges of the second U-shaped stirrup 15, and the second longitudinal rib 16 on one side edge of the second U-shaped stirrup 15 is connected to the corresponding second longitudinal rib 16 on the other side edge through a second tie bar 17. And a plurality of second U-shaped stirrups 15 are arranged along the length direction of the underground station, and each second longitudinal bar 16 is connected with the plurality of second U-shaped stirrups 15. Preferably, the two side edges of the first U-shaped stirrup 9 extending out are also provided with a first longitudinal rib 10, and a part of the first longitudinal rib 10 on the long side edge of the first U-shaped stirrup 9 is connected with a second longitudinal rib 16 corresponding to the first longitudinal rib on the long side edge of the second U-shaped stirrup 15 through the second longitudinal rib 16, so that the connection strength between the first U-shaped stirrup 9 and the second U-shaped stirrup 15 is further improved.
Further, as shown in fig. 2, a third U-shaped stirrup 12 is further disposed in the U-shaped opening of the first U-shaped stirrup 9, and two side edges of the third U-shaped stirrup 12 extend out of the first cast-on turning beam 8 and extend into the second cast-on turning beam 14. In addition, a third longitudinal rib 13 is added on the bottom edge of the third U-shaped stirrup 12 and the bottom edge of the first U-shaped stirrup 9, and two side edges of the third U-shaped stirrup 12 are connected with the first tie bar 11.
Furthermore, as shown in fig. 3, a fourth U-shaped stirrup 18 is further disposed in the U-shaped opening of the second U-shaped stirrup 15, the U-shaped opening of the fourth U-shaped stirrup 18 is disposed opposite to the U-shaped opening of the third U-shaped stirrup 12, two side edges of the fourth U-shaped stirrup 18 are respectively connected to two side edges of the third U-shaped stirrup 12 in a positioning manner, and the number of the third U-shaped stirrup 12 and the number of the fourth U-shaped stirrup 18 are determined according to the design requirement of the upturned beam 7, so as to further improve the overall stress performance of the upturned beam 7. Preferably, one side of each side of the third U-shaped stirrup 12 is short, one side of each side of the fourth U-shaped stirrup 18 is short, and the long side and the short side of the third U-shaped stirrup 12 are respectively connected with the short side and the long side of the fourth U-shaped stirrup 18 in a positioning manner, so that the strength of the joint of the third U-shaped stirrup 12 and the fourth U-shaped stirrup 18 is improved. In addition, a fourth longitudinal rib 19 is added on the bottom edge of the fourth U-shaped stirrup 18 and the bottom edge of the second U-shaped stirrup 15, and two side edges of the fourth U-shaped stirrup 18 are connected with the second tie bar 17.
As shown in fig. 1-3, the embodiment of the present invention further provides a construction method for a roof plate 5 upturning beam 7 structure of a subway station, which includes the following steps:
1) binding a steel bar framework of a station top plate 5 and a first U-shaped stirrup 9 of a first-poured upturned beam 8, completing concrete pouring of the station top plate 5 and the first-poured upturned beam 8, wherein at least part of the first-poured upturned beam 8 is positioned in the station top plate 5, at least part of the first U-shaped stirrup 9 extends out of the first-poured upturned beam 8, and the height of the first U-shaped stirrup 9 extending out of the first-poured upturned beam 8 is calculated and determined according to the design requirement of the upturned beam 7 and the lap joint length specified by the specification;
2) after the concrete of the station top plate 5 reaches the designed strength, chiseling off the part of the first concrete support 6 which conflicts with the post-cast upturned beam 14 so as to facilitate the reinforcement binding and concrete pouring of the post-cast upturned beam 14 during construction;
3) pouring a second U-shaped stirrup of the upper turning beam 14 after binding, and positioning and overlapping the part of the second U-shaped stirrup extending out of the first pouring upper turning beam 8 with the first U-shaped stirrup;
4) and (3) roughening the upper surface of the upper turning beam 8 which is poured firstly, and pouring the upper turning beam 14 after pouring to finish the construction of the upper turning beam 7.
The utility model pours the upturning beam 7 for two times, which not only can satisfy the structural stress of the upturning beam 7, but also can ensure the effective space area of the standing hall layer; after the part of the first concrete support 6 which conflicts with the post-cast upturned beam 14 is chiseled, a space is provided for the reinforcement binding of the upturned beam 7 and the post-concrete pouring, the construction difficulty is greatly reduced, and the construction quality is ensured; in addition, the first U-shaped stirrup 9 reserved on the first cast-on upturning beam 8 and the second U-shaped stirrup 15 of the later cast-on upturning beam 14 are positioned and lapped in the later cast-on upturning beam 14, so that the integrity of the upturning beam 7 is improved.
Further, as shown in fig. 3, the bottom of the first U-shaped stirrup 9 is embedded in the cast-in-place upturned beam 7, both side edges of the first U-shaped stirrup 9 extend out of the first-poured upturned beam 8, and the length of the first U-shaped stirrup 9 extending out of the first-poured upturned beam 8 is determined according to the design strength of the upturned beam 7 and the lap joint requirement; when the second U-shaped stirrup 15 is bound, the U-shaped opening of the second U-shaped stirrup 15 and the U-shaped opening of the first U-shaped stirrup 9 are oppositely arranged, two side edges of the second U-shaped stirrup 15 are respectively connected with two side edges of the first U-shaped stirrup 9 in a positioning mode, and the rest reinforcing steel bars in the turning beam 14 are poured after binding. Preferably, the lengths of the two sides of the first U-shaped stirrup 9 are different, the lengths of the two sides of the second U-shaped stirrup 15 are different, and the long side and the short side of the first U-shaped stirrup 9 are respectively welded with the short side and the long side of the second U-shaped stirrup 15, so that the stirrups of the upturned beam 7 are ensured to be closed, and the seismic requirements are met; meanwhile, the two welding positions are staggered, the strength of the welding positions is improved, and the stress performance of the upturned beam 7 after pouring is guaranteed. The position of the welding joint of the stirrup can be adjusted according to the relevant specification requirements, and 1, the welding requirement of the first-level joint needs to be met, so that the complete closed stirrup of the upturned beam 7 is formed.
The roof 5 upturning beam 7 structure of the subway station is suitable for the underground engineering field such as rail transit. As shown in fig. 1, the construction of a subway station with columns in two underground layers is taken as an example for explanation, firstly, the construction of an enclosure structure is carried out, wherein the enclosure structure comprises a retaining wall 1, a crown beam 2, a diaphragm wall 4 and the like, and the open cut method is adopted, three concrete supports are erected while excavating, and the concrete supports are excavated to the bottom of a foundation pit; and constructing a bottom plate of the subway station, dismantling a third concrete support at the bottom, then completing the construction of the underground second-layer side wall, the middle upright post and the middle plate in sequence, dismantling the middle second concrete support, completing the construction of the underground first-layer side wall and the middle upright post, and finally constructing a top plate and an upturned beam 7 according to the construction method to complete the construction of the subway station.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The roof plate upturning beam structure of the subway station is characterized by comprising a first-cast upturning beam and a second-cast upturning beam, wherein at least part of the first-cast upturning beam is positioned in the roof plate of the station; the first concrete support above the first cast-in-place beam is chiseled after the position, corresponding to the first cast-in-place beam, of the station top plate reaches the designed strength, the post-cast in-place beam is arranged on the first cast-in-place beam, and the post-cast in-place beam vertically penetrates through the first concrete support; a first U-shaped stirrup is reserved on the first-cast upturning beam, and at least part of the first U-shaped stirrup extends out of the first-cast upturning beam; and a second U-shaped stirrup is arranged in the post-cast upper turning beam, and the first U-shaped stirrup and the second U-shaped stirrup are positioned and connected in the post-cast upper turning beam.
2. The roof upturning beam structure of the subway station as claimed in claim 1, wherein: the bottom of the first U-shaped stirrup is positioned in the first-poured upper turning beam, and two side edges of the first U-shaped stirrup extend out of the first-poured upper turning beam and extend into the second-poured upper turning beam to be connected with the second U-shaped stirrup in a positioning manner.
3. The roof upturned beam structure of a subway station as claimed in claim 2, wherein: all add many first muscle of indulging on the both sides edge of first U type stirrup, the first muscle of indulging on one of them side of first U type stirrup and the first muscle of indulging on the opposite side edge pass through first lacing wire fixed connection.
4. The roof upturned beam structure of a subway station as claimed in claim 2, wherein: the U-shaped opening of the second U-shaped stirrup is opposite to the U-shaped opening of the first U-shaped stirrup, and two side edges of the second U-shaped stirrup are respectively connected with two side edges of the first U-shaped stirrup in a positioning manner.
5. The roof upturned beam structure of a subway station as claimed in claim 4, wherein: the first U-shaped stirrup is provided with two side edges, one side edge is long and the other side edge is short, the second U-shaped stirrup is provided with two side edges, one side edge is long and the other side edge is short, and the long side edge and the short side edge of the first U-shaped stirrup are respectively connected with the short side edge and the long side edge of the second U-shaped stirrup in a positioning manner.
6. The roof upturned beam structure of a subway station as claimed in claim 4, wherein: and a plurality of second longitudinal bars are additionally arranged on two side edges of the second U-shaped stirrup, and the second longitudinal bar on one side edge of the second U-shaped stirrup is fixedly connected with the second longitudinal bar on the other side edge of the second U-shaped stirrup through a second lacing wire.
7. The roof upturned beam structure of a subway station as claimed in claim 4, wherein: and a third U-shaped stirrup is further arranged in the U-shaped opening of the first U-shaped stirrup, and two side edges of the third U-shaped stirrup extend out of the first-poured upper turning beam and extend into the second-poured upper turning beam.
8. The roof up-turned beam structure of a subway station as claimed in claim 7, wherein: a fourth U-shaped stirrup is further arranged in the U-shaped opening of the second U-shaped stirrup, and the U-shaped opening of the fourth U-shaped stirrup is opposite to the U-shaped opening of the third U-shaped stirrup; and two side edges of the fourth U-shaped stirrup are respectively connected with two side edges of the third U-shaped stirrup in a positioning manner.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921072797.0U CN210658442U (en) | 2019-07-10 | 2019-07-10 | Roof plate upturning beam structure of subway station |
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| CN201921072797.0U CN210658442U (en) | 2019-07-10 | 2019-07-10 | Roof plate upturning beam structure of subway station |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110258639A (en) * | 2019-07-10 | 2019-09-20 | 中铁第四勘察设计院集团有限公司 | A kind of subway station top plate turns over girder construction and its construction method |
| CN111827348A (en) * | 2020-06-29 | 2020-10-27 | 中铁广州工程局集团深圳工程有限公司 | Construction method of subway support beam |
-
2019
- 2019-07-10 CN CN201921072797.0U patent/CN210658442U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110258639A (en) * | 2019-07-10 | 2019-09-20 | 中铁第四勘察设计院集团有限公司 | A kind of subway station top plate turns over girder construction and its construction method |
| CN110258639B (en) * | 2019-07-10 | 2024-02-27 | 中铁第四勘察设计院集团有限公司 | Upward beam turning structure of top plate of subway station and construction method of upward beam turning structure |
| CN111827348A (en) * | 2020-06-29 | 2020-10-27 | 中铁广州工程局集团深圳工程有限公司 | Construction method of subway support beam |
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