CN112177012A - Precast concrete non-primary support system with lattice columns for foundation pit engineering and construction method - Google Patents
Precast concrete non-primary support system with lattice columns for foundation pit engineering and construction method Download PDFInfo
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- CN112177012A CN112177012A CN202011007312.7A CN202011007312A CN112177012A CN 112177012 A CN112177012 A CN 112177012A CN 202011007312 A CN202011007312 A CN 202011007312A CN 112177012 A CN112177012 A CN 112177012A
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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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Abstract
The invention belongs to the technical field of foundation pit engineering, and particularly relates to a precast concrete non-primary support system with lattice columns for foundation pit engineering and a construction method, wherein the precast concrete non-primary support system with the lattice columns for foundation pit engineering comprises a support member, a precast concrete waist beam, lattice columns and a support structure; the supporting member comprises a cast-in-place concrete support and at least two precast concrete supports, and two ends of the cast-in-place concrete support are respectively connected with the two precast concrete supports through connecting joints; the inner side of the enclosure structure is provided with a precast concrete waist beam, and two ends of the supporting member are respectively connected with the precast concrete waist beams on two sides of the supporting member through connecting joints; be equipped with the lattice column in the envelope, the lattice column vertically runs through cast in situ concrete and supports the concretion together with cast in situ concrete. The precast concrete supports of the support member are connected by adopting cast-in-place concrete supports, so that the rigidity of the support member can be ensured, the installation error can be adjusted, the construction and installation are convenient, meanwhile, the support member is well connected with the lattice column, and the stability of a support system is improved.
Description
Technical Field
The invention belongs to the technical field of foundation pit engineering, and particularly relates to a precast concrete non-primary support system with lattice columns for foundation pit engineering and a construction method.
Background
The supporting type retaining structure mainly comprises a retaining component and a support, wherein the retaining component is most commonly a cast-in-situ bored pile, an underground continuous wall and the like. The supporting type retaining structure is definite in stress, relatively mature in calculation method and engineering practice, suitable for deep foundation pits of various geological conditions and most reliable in supporting structure form at present. At present, a first support in a support type supporting and retaining structure is supported by reinforced concrete mostly, the support and a crown beam form a whole, deformation resistance is high, and integral damage caused by skirting at the lower part of a foundation pit can be avoided. The first reinforced concrete support is constructed by adopting cast-in-place concrete mostly, the construction process is complex, the speed is slow, the concrete support is a temporary structure, and the concrete support needs to be chiseled out and cannot be recycled at the later stage, so that a large amount of redundant waste building rubbish is formed, resources are wasted, and the environment is polluted; generally, when the soil condition is good, the second and the following supports can adopt steel supports, but when the soil condition is poor, a plurality of concrete supports also need to be designed, but the problems exist in the first concrete support.
Therefore, there is a need for a precast concrete non-primary support system with lattice columns for foundation pit engineering and a construction method thereof, so as to overcome the above problems.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a precast concrete non-primary support system with lattice columns for foundation pit engineering, which can meet the use requirement of a foundation pit, adjust the installation error and has good stability.
In order to achieve the purpose, the technical scheme of the invention is a precast concrete non-primary support system with lattice columns for foundation pit engineering, which comprises a support member, a precast concrete waist beam, lattice columns and a support structure; the supporting member comprises a cast-in-place concrete support and at least two precast concrete supports, and two ends of the cast-in-place concrete support are respectively connected with the two precast concrete supports through connecting joints; the inner side of the enclosure structure is provided with a precast concrete waist beam, and two ends of the supporting member are respectively connected with the precast concrete waist beams on two sides of the supporting member through connecting joints; and lattice columns are further arranged in the enclosure structure, vertically penetrate through the cast-in-place concrete support and are fixedly connected with the cast-in-place concrete support.
Furthermore, the precast concrete wale is supported on a steel bracket, and the steel bracket is fixedly connected with the enclosure structure; and the precast concrete wales on two sides of the precast concrete support are all propped against the envelope structure.
Further, the steel bracket comprises a support steel plate, a connecting steel plate and a stiffening plate; the connecting steel plate is vertically arranged and connected with an embedded part in the enclosure structure; the supporting steel plate is horizontally arranged and connected with the top of the connecting steel plate; the bottom surface of the supporting steel plate is connected with the connecting steel plate through a stiffening plate; the precast concrete wale is supported on the support steel plate.
Further, the connecting joint comprises two first fixing pieces and a connecting piece for connecting the two first fixing pieces; the two first fixing pieces are respectively fixed at the ends of the two concrete members to be connected.
Furthermore, the connecting piece comprises two first steel plates which are oppositely arranged, and the two first steel plates are connected through section steel; the first fixing piece comprises a second steel plate and a bolt embedded in the concrete member; the second steel plate is fixed on the end face of the concrete member; the second steel plates of the two first fixing pieces are connected with the two first steel plates through the bolts respectively.
Furthermore, the second steel plate is welded with a shear key, the end part of the concrete member is correspondingly provided with a groove, and the shear key is arranged in the groove.
Further, it is characterized in that: a plurality of supporting members are arranged in the enclosure structure at intervals along the horizontal direction, a steel connecting beam is arranged between adjacent cast-in-place concrete supports, and two ends of the steel connecting beam are respectively connected with the cast-in-place concrete supports on two sides of the steel connecting beam.
Furthermore, third steel plates are fixed to the end part of the steel connecting beam and the side surface of the cast-in-place concrete support, and a fourth steel plate which is horizontally arranged is connected to each third steel plate; and the fourth steel plate at the end part of the steel connecting beam is connected with the fourth steel plate on the side surface of the cast-in-place concrete support through a connecting bolt.
Furthermore, the third steel plates fixed on the two side surfaces of the cast-in-place concrete support are connected through a plurality of anchor bars pre-embedded in the cast-in-place concrete support.
The invention also provides a construction method of the precast concrete non-primary support system with the latticed column in the foundation pit engineering, which comprises the following steps:
1) prefabricating the precast concrete support, the precast concrete waist beam, the steel connecting beam, the steel corbel and the connecting joint in a factory, and transporting to a construction site;
2) when the enclosure structure is constructed, pre-embedding embedded parts on the enclosure structure, and constructing lattice columns in the foundation pit; after the building enclosure is constructed, constructing a first support, then excavating soil to a position other than a first support, and connecting the steel corbel with the embedded part;
3) erecting a formwork, finishing the binding of reinforcing steel bars of the cast-in-place concrete support, embedding connecting joints at two ends of the cast-in-place concrete support, simultaneously enabling longitudinal bars of the cast-in-place concrete support to penetrate through the latticed column, and then pouring the cast-in-place concrete support to enable the latticed column and the cast-in-place concrete support to form a whole;
4) hoisting the precast concrete waist beam and placing the precast concrete waist beam on the steel corbel; after the cast-in-place concrete support reaches the design strength, hoisting the precast concrete support, and connecting the precast concrete support with the precast concrete waist beam and the cast-in-place concrete support through the connecting joint;
5) and connecting the adjacent cast-in-place concrete supports in the horizontal direction together through steel connecting beams.
Compared with the prior art, the invention has the following beneficial effects:
(1) the precast concrete supports of the support member are connected by adopting cast-in-place concrete supports, so that the rigidity of the support member can be ensured, the use requirement of a foundation pit can be met, the installation error can be adjusted, the construction and installation are convenient, the two ends of the support member are tightly propped against the enclosure structure, and the construction safety of the foundation pit is ensured; meanwhile, the support member and the lattice column are well connected, so that the stability of a support system is improved;
(2) the precast concrete supports, the precast concrete supports and the precast concrete waist beam as well as the precast concrete supports and the cast-in-place concrete supports are connected through the connecting joints by bolts, so that the mounting and the dismounting are simple and rapid, the construction is convenient, the concrete member is not damaged in the dismounting process, the concrete member can be recycled, and the resource waste and the environmental pollution are reduced.
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 plan view of a precast concrete non-primary support system with lattice columns for foundation pit engineering provided in an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a precast concrete non-primary support system with lattice columns for foundation pit engineering according to an embodiment of the present invention;
FIG. 3 is a sectional view of a steel corbel of a precast concrete non-primary support system with lattice columns in foundation pit engineering according to an embodiment of the present invention;
fig. 4 is a plan view of a joint of a precast concrete non-primary support system with lattice columns in foundation pit engineering according to an embodiment of the present invention;
FIG. 5 is a view A-A of FIG. 4;
FIG. 6 is a view B-B of FIG. 4;
FIG. 7 is a plan view of the connection of a cast in place concrete support and a steel tie beam provided by an embodiment of the present invention;
FIG. 8 is a view C-C of FIG. 7;
in the figure: 1. prefabricating a concrete support; 2. prefabricating a concrete waist beam; 3. supporting the cast-in-place concrete; 4. connecting a joint; 41. a first steel plate; 42. a second steel plate; 43. section steel; 44. an X-direction stiffener; 45. a Y-direction stiffener; 46. a shear key; 47. a bolt; 5. a lattice column; 6. steel corbels; 61. a support steel plate; 62. connecting steel plates; 63. a stiffening plate; 7. an enclosure structure; 71. pre-burying a steel plate; 72. embedding bolts in advance; 8. a steel tie beam; 9. a third steel plate; 10. a fourth steel plate; 11. a connecting bolt; 12. a rib plate; 13. anchoring ribs; 14. a retaining wall.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within 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 only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, 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. 1-2, the embodiment provides a precast concrete non-primary support system with lattice columns for foundation pit engineering, which includes a support member, a precast concrete wale 2, lattice columns 5 and a support structure 7; the support member comprises a cast-in-place concrete support 3 and at least two precast concrete supports 1, and two ends of the cast-in-place concrete support 3 are respectively connected with the two precast concrete supports 1 through connecting joints 4; the inner side of the enclosure structure 7 is provided with a precast concrete wale 2, and two ends of the supporting member are respectively connected with the precast concrete wales 2 on two sides of the supporting member through connecting joints 4; and a lattice column 5 is also arranged in the enclosure structure 7, and the lattice column 5 vertically penetrates through the cast-in-place concrete support 3 and is fixedly connected with the cast-in-place concrete support 3. The precast concrete supports 1 of the support member of the embodiment are connected by the cast-in-place concrete supports 3, so that not only can the rigidity of the support member be ensured and the use requirement of the foundation pit be met, but also the installation error can be adjusted and the construction and installation are convenient, so that the two ends of the support member are tightly propped against the enclosure structure 7, and the construction safety of the foundation pit is ensured; meanwhile, the support member and the lattice column 5 are well connected, and the stability of the support system is improved.
The cast-in-place concrete supports 3 and the precast concrete supports 1 in the embodiment can be square or round; the structure can be solid or hollow.
Further, the precast concrete wale 2 is supported on a steel corbel 6, and the steel corbel 6 is fixedly connected with the enclosure structure 7; and the precast concrete wales 2 at two sides of the precast concrete support 1 are all propped against the envelope structure 7. The precast concrete wale 2 at the two ends of the precast concrete support 1 of the embodiment is supported on the steel corbel 6 and directly props against the enclosure structure 7, the precast concrete wale 2 is not fixedly connected with the enclosure structure 7, the precast concrete wale 2 cannot be damaged when the precast concrete wale is dismantled in the later period, and the repeated recycling of the precast concrete wale 2 is facilitated.
Further, the steel bracket 6 includes a support steel plate 61, a connection steel plate 62, and a stiffener plate 63; the connecting steel plate 62 is vertically arranged and connected with an embedded part in the enclosure structure 7; the supporting steel plate 61 is horizontally arranged and connected with the top of the connecting steel plate 62; the bottom surface of the supporting steel plate 61 is connected with the connecting steel plate 62 through a stiffening plate 63; the precast concrete wale 2 is supported on the support steel plate 61. As shown in fig. 3, the embedded part of this embodiment includes an embedded steel plate 71 fixed on the inner wall of the enclosure 7 and an embedded bolt 72 embedded in the enclosure 7, and one end of the embedded bolt 72 extends out of the enclosure 7 and sequentially penetrates through the embedded steel plate 71 and the connecting steel plate 62 to be fixed by a nut. The steel corbel 6 in the embodiment is a steel structural member, the steel corbel 6 is connected with the enclosure structure 7 through the bolts, the installation and the disassembly are simple and rapid, the construction is convenient, the enclosure structure 7 cannot be damaged in the disassembly process, the steel corbel 6 cannot be damaged, and the steel corbel 6 can be recycled.
Further, the connecting joint 4 comprises two first fixing pieces and a connecting piece for connecting the two first fixing pieces; the two first fixing pieces are respectively fixed at the ends of the two concrete members to be connected. The concrete member in this embodiment includes a precast concrete support 1, a precast concrete wale 2, and a cast-in-place concrete support 3. The precast concrete support 1 and the precast concrete waist rail 2 of this embodiment all adopt the prefabricated component form, can be in factory batch production, deliver to the scene again and assemble, not only can improve production efficiency, and the quality is reliable, saves labour, saves the template, can also guarantee quick convenient construction, and reduction of erection time is applicable to in the all kinds of foundation ditch engineering of building, and recoverable reuse in later stage.
Furthermore, the connecting piece comprises two first steel plates 41 which are oppositely arranged, and the two first steel plates 41 are connected through section steel 43; the first fixing piece comprises a second steel plate 42 and a bolt 47 pre-embedded in the concrete member; the second steel plate 42 is fixed on the end face of the concrete member; the second steel plates 42 of the two first fixing members and the two first steel plates 41 are connected by the bolts 47, respectively.
The connecting piece in this embodiment is the steel construction spare, and the mounting on connecting piece and the concrete member passes through bolt 47 to be connected, and not only the installation is simple swift with the dismantlement, convenient construction, neither can destroy the concrete member in the dismantlement process moreover, also can not destroy the connecting piece, makes concrete member and connecting piece all can reuse, reduces wasting of resources and environmental pollution.
As shown in fig. 4-6, a plurality of bolt holes are formed in each of the first steel plate 41 and the second steel plate 42 of the present embodiment, a plurality of bolts 47 are embedded in the concrete member, the bolts 47 correspond to the bolt holes one by one, and one end of each bolt 47 extends out of the concrete member and sequentially passes through the second steel plate 42 and the first steel plate 41 to be fixed by a nut; the two first steel plates 41 are connected through the section steel 43, the section steel 43 can adopt various forms such as rectangular steel pipes, I-shaped steel, round steel pipes and cross-shaped steel, and the outer wall of the section steel 43 is connected with the first steel plates 41 through the X-direction stiffening plate 44 and the Y-direction stiffening plate 45.
First mounting in this embodiment also can adopt the structural style of embedded sleeve and bolt, specifically is that the tip of precast concrete component is pre-buried has a plurality of embedded sleeves, sets up the bolt hole corresponding embedded sleeve's position on first steel sheet 41, screws into embedded sleeve after passing the bolt hole on first steel sheet 41 through the bolt in, realizes being connected of mounting and connecting piece.
Furthermore, the second steel plate 42 is welded with a shear key 46, and a groove is correspondingly formed at the end of the concrete member, and the shear key 46 is installed in the groove. In the embodiment, the shear key 46 is welded on one side of the second steel plate 42 facing the concrete member, and the shear key 46 is arranged in the groove at the end part of the concrete member, so that the effects of resisting the shear force and limiting the displacement of the end part are achieved; the shear key 46 may be made of various types of steel such as rectangular steel pipe, i-steel, circular steel pipe, channel steel, angle steel, cross-shaped steel, and may also be made of anchor bars.
Further, it is characterized in that: a plurality of supporting members are arranged in the enclosure structure 7 at intervals along the horizontal direction, a steel connecting beam 8 is arranged between the adjacent cast-in-place concrete supports 3, and two ends of the steel connecting beam 8 are respectively connected with the cast-in-place concrete supports 3 on two sides of the steel connecting beam. In the embodiment, at least one layer of wale is arranged in the enclosure structure 7 at intervals along the height direction of the enclosure structure, each layer of wale is formed by splicing precast concrete wales 2, a plurality of supporting members arranged at intervals along the horizontal direction are supported in each layer of wale, and adjacent cast-in-place concrete supports 3 of the supporting members of each layer are connected through steel connecting beams 8; the steel connecting beam 8 can be made of various forms such as rectangular steel pipes, I-shaped steel pipes, round steel pipes and cross-shaped steel.
Furthermore, third steel plates 9 are fixed at the end parts of the steel connecting beams 8 and the side surfaces of the cast-in-place concrete supports 3, and a fourth steel plate 10 which is horizontally arranged is connected to each third steel plate 9; and a fourth steel plate 10 at the end part of the steel connecting beam 8 is connected with a fourth steel plate 10 at the side surface of the cast-in-place concrete support 3 through a connecting bolt 11. As shown in fig. 7 to 8, the steel coupling beam 8 of the present embodiment is prefabricated in a factory, and a third steel plate 9 is welded to both ends of the steel coupling beam 8, respectively, and a fourth steel plate 10 perpendicular thereto is welded to the third steel plate 9; and the fourth steel plate 10 of 8 tip of steel tie beam and cast in situ concrete support 3 side all reserve on having the trombone bolt hole on the fourth steel plate 10, through installing connecting bolt 11 with steel tie beam 8 and cast in situ concrete support 3 fixed connection in the trombone bolt hole, can guarantee the intensity of connected node to guarantee engineering safety, can adjust the relative position of trombone bolt hole as required again simultaneously and change the length of joint, thereby the adjustment construction error.
Furthermore, the third steel plates 9 fixed on the two side surfaces of the cast-in-place concrete support 3 are connected through a plurality of anchor bars 13 pre-embedded in the cast-in-place concrete support 3. In this embodiment, when the steel bars of the cast-in-place concrete support 3 are bound, the third steel plates 9 are fixed on two sides of the cast-in-place concrete support, the two third steel plates 9 are connected by welding the plurality of anchor bars 13, the lattice column 5 penetrates through the space between the two third steel plates 9, the longitudinal bars of the cast-in-place concrete support 3 penetrate through the lattice column 5, then the cast-in-place concrete support 3 is poured, the two third steel plates 9 are fixed on the two cast-in-place concrete supports 3, the lattice column 5 and the cast-in-place concrete support 3 are poured to form a whole, and the integrity and the connection strength of the lattice column 5 and the cast-in-place concrete support 3 are improved.
Optimally, the third steel plate 9 and the fourth steel plate 10 at the end part of the steel connecting beam 8 and the third steel plate 9 and the fourth steel plate 10 at the side surface of the cast-in-place concrete support 3 are reinforced by the rib plate 12; the rib plate 12 at the end part of the steel connecting beam 8 can be welded when the steel connecting beam 8 is prefabricated, the third steel plate 9, the fourth steel plate 10 and the rib plate 12 at the end part of the cast-in-place concrete support 3 can be welded into a whole and then embedded in the cast-in-place concrete support 3, or the third steel plate 9 can be embedded in the cast-in-place concrete support 3, and then the fourth steel plate 10 and the rib plate 12 are welded on the third steel plate 9.
The embodiment also provides a construction method of the precast concrete non-primary support system with the lattice column 5 in the foundation pit engineering, which comprises the following steps:
1) leveling a field, constructing a fence, moving and modifying pipelines and dredging traffic; constructing a dewatering well, an enclosure structure 7 (enclosure piles, underground continuous walls and the like) and lattice columns 5, and pre-burying embedded parts on the enclosure structure 7 when the enclosure structure 7 is constructed; then carrying out foundation pit pre-precipitation to ensure that the water level is 1m below the substrate;
2) after the building envelope 7 reaches the design strength, excavating a foundation pit to a position 0.5m below the first support, and constructing a crown beam and a first concrete support; then excavating the foundation pit to a position 0.5m below the second support;
3) prefabricating the precast concrete support 1, the precast concrete waist beam 2, the steel connecting beam 8, the steel corbel 6 and the connecting joint 4 in a factory, and transporting to a construction site;
4) connecting the steel bracket 6 with an embedded part on the enclosure structure 7 through a bolt;
5) erecting a formwork, finishing the binding of reinforcing steel bars of the cast-in-place concrete support 3, embedding connecting joints 4 at two ends of the cast-in-place concrete support 3, enabling longitudinal bars of the cast-in-place concrete support 3 to penetrate through the lattice column 5, and then pouring the cast-in-place concrete support 3 to enable the lattice column 5 and the cast-in-place concrete support 3 to form a whole;
6) hoisting the precast concrete wale 2 and placing on the steel corbel 6; after the cast-in-place concrete support 3 reaches the design strength, hoisting the precast concrete support 1, and connecting the precast concrete support 1 with the precast concrete wale 2 and the cast-in-place concrete support 3 through the connecting joint 4;
7) connecting the adjacent cast-in-place concrete supports 3 in the horizontal direction together through steel connecting beams 8; the concrete method comprises the steps of hoisting the adjacent cast-in-place concrete supports 3 between the adjacent cast-in-place concrete supports 3, and connecting a fourth steel plate 10 at the end part of the steel connecting beam 8 with a fourth steel plate 10 on the side surface of the cast-in-place concrete support 3 through a connecting bolt 11;
8) the third and fourth supporting construction processes below the second support are the same as the steps 3) -7).
The dismantling sequence of the precast concrete non-primary support system for foundation pit engineering described in this embodiment is as follows:
1) loosening the connecting bolts 11 for connecting the steel connecting beam 8 and the cast-in-place concrete support 3, and removing the steel connecting beam 8;
2) breaking the cast-in-place concrete support 3, loosening a bolt for connecting the cast-in-place concrete support 3 with the connecting joint 4 of the precast concrete support 1, and removing the cast-in-place concrete support 3;
3) loosening bolts of the connecting joints 4 for connecting the precast concrete supports 1 and the precast concrete wales 2, and lifting away the precast concrete supports 1 and the precast concrete wales 2;
4) and loosening the bolts for connecting the enclosure structure 7 and the steel bracket 6, and removing the steel bracket 6.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
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| CN113026815A (en) * | 2021-03-23 | 2021-06-25 | 中铁第四勘察设计院集团有限公司 | Integrally-assembled pillarless underground structure |
| CN113026935A (en) * | 2021-03-23 | 2021-06-25 | 中铁第四勘察设计院集团有限公司 | Prefabricated plate of assembled structure and assembly structure thereof |
| CN113047334A (en) * | 2021-03-23 | 2021-06-29 | 中铁第四勘察设计院集团有限公司 | Concrete prefabricated part transverse connection node and assembled underground station |
| CN113529943A (en) * | 2021-07-21 | 2021-10-22 | 上海建工一建集团有限公司 | Concrete support and lattice column connecting device and method convenient to dismantle |
| CN115288185A (en) * | 2022-06-28 | 2022-11-04 | 深圳市地铁集团有限公司 | Middle plate supporting structure for subway station opening and supporting method thereof |
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| CN113026815B (en) * | 2021-03-23 | 2025-04-04 | 中铁第四勘察设计院集团有限公司 | An integrally assembled column-free underground structure |
| CN113529943A (en) * | 2021-07-21 | 2021-10-22 | 上海建工一建集团有限公司 | Concrete support and lattice column connecting device and method convenient to dismantle |
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