A C-beam based underground concrete structure connecting communication structure

Abstract

The application discloses a C-beam-based underground concrete structure connecting and communicating structure, which comprises a first building structure and a second building structure, the first building structure is connected with a channel top plate, the channel top plate is connected with a top C-beam, the notch of the top C-beam faces the second building structure and engages the second building structure, the first building structure is connected with a channel bottom plate, the channel bottom plate is connected with a bottom channel beam, the bottom channel beam is connected with the second building structure, and a support column is arranged between the top C-beam and the bottom channel beam.The application has the beneficial effects that the lower half of the C-beam can be constructed after the existing side wall is removed, the structure connection can be accurately controlled, large-scale excavation can be avoided, the interference on the existing structure can be reduced, and the construction safety can be improved.The upper half of the C-beam and the top plate can be synchronously poured, the overall construction period can be shortened, and the construction efficiency can be improved.The C-beam is constructed in stages, load can be effectively dispersed, the stability of the existing structure in the construction process can be ensured, and the influence on the existing structure can be reduced.

Description

Technical Field

[0001] This application belongs to the field of building construction technology, specifically relating to an underground concrete structure connection and connection structure based on C-shaped beams. Background Technology

[0002] Deep underground space development often requires expansion based on existing underground structures. However, the existing underground structures built in the early stages often do not have provisions for future connection conditions. For example, due to reasons such as low structural strength and insufficient steel reinforcement, the structure may deform or be damaged during the removal of the side walls of the existing structure, which may be affected by factors such as soil pressure and vehicle loads. Utility Model Content

[0003] The purpose of this application is to provide an underground concrete structure connection and connection structure based on C-shaped beams. During the opening of the side walls of the existing structure, C-shaped beams are used to construct a new beam-column system at the opening node of the side wall, which meets the building's functional requirements, ensures the structural safety under stress, and solves the problem of connection and connection of the existing underground structure.

[0004] The objective of this application is achieved through the following technical solution:

[0005] An underground concrete structure connection and connection structure based on C-shaped beams includes a first building structure and a second building structure. The first building structure is connected to one end of the passage top slab, and the other end of the passage top slab is connected to the top C-shaped beam. The slot of the top C-shaped beam faces the second building structure and engages with the second building structure. The first building structure is connected to one end of the passage bottom slab, and the other end of the passage bottom slab is connected to the bottom passage beam. The bottom passage beam is connected to the second building structure. A support column is provided between the top C-shaped beam and the bottom passage beam.

[0006] Furthermore, both the first and second building structures are subway station concourse levels.

[0007] Furthermore, the first building structure is an existing building structure or a newly constructed building structure, and the second building structure is an existing building structure.

[0008] Furthermore, the first building structure connects the top slab and bottom slab of the passage with rebar, and the second building structure connects the top C-beam and bottom passage beam with rebar.

[0009] Furthermore, the top plate of the passage is integrally cast and connected to the top C-shaped beam, and the bottom plate of the passage is integrally cast and connected to the bottom passage beam.

[0010] Furthermore, the top C-shaped beam includes a primary cast upper beam and a secondary cast lower beam. The channel top plate is connected to the primary cast upper beam, the primary cast upper beam is connected to the secondary cast lower beam, and the secondary cast lower beam is connected to the support column.

[0011] Furthermore, the top slab of the passage is integrally cast and connected to the upper beam of the primary pouring, and the lower beam of the secondary pouring is integrally cast and connected to the support column.

[0012] Furthermore, the upper beam, which is cast in one go, is connected to the lower beam, which is cast in two stages, via a steel bar connector.

[0013] Furthermore, the secondary cast lower beam includes primary demolition beam segments and secondary demolition beam segments. The primary demolition beam segments are arranged at intervals and are connected to the support columns. The secondary demolition beam segments are connected to each other in the primary demolition beam segments.

[0014] Furthermore, the support column is equipped with a temporary support that can be removed once.

[0015] The beneficial effects of this application are:

[0016] (1) Social benefit prediction analysis: After demolishing the existing side walls, the construction of the lower half of the C-shaped beam can precisely control the structural connection, avoid large-scale excavation, reduce interference with the existing structure, and improve construction safety. The simultaneous pouring of the upper half of the C-shaped beam and the top slab can shorten the overall construction period and improve construction efficiency. The phased construction of the C-shaped beam can effectively distribute the load, ensure the stability of the existing structure during construction, and reduce the impact on the existing structure.

[0017] (2) Economic Benefit Forecast Analysis: The C-beam construction method, through phased construction, reduced interference, and optimized construction period, is expected to reduce the total cost by approximately 20%-30%, making it particularly suitable for cost- and time-sensitive projects such as underground space development in urban core areas and subway transfers. It is crucial to control the risks associated with sidewall demolition and joint quality to ensure maximum economic benefits.

[0018] The aforementioned main solution and its various further alternatives can be freely combined to form multiple solutions, all of which are solutions that can be adopted and claimed in this application; furthermore, the (non-conflicting alternatives) can also be freely combined with each other and with other alternatives. Those skilled in the art, after understanding this solution, will realize from the prior art and common general knowledge that there are many combinations, all of which are technical solutions to be protected in this application, and will not be exhaustively listed here. Attached Figure Description

[0019] Figure 1 This is a structural diagram of construction step 1 of this application.

[0020] Figure 2 This is a structural diagram of construction step 2 of this application.

[0021] Figure 3 This is a structural diagram of construction step 3 of this application.

[0022] Figure 4 This is a structural diagram of construction step 4 of this application.

[0023] Figure 5 This is a structural diagram of construction step 5 of this application.

[0024] Figure 6 This is a structural diagram of step 1 of construction steps 4 to 5 of this application.

[0025] Figure 7 This is a schematic diagram of the structure of step 2, which is the distribution of construction steps 4 to 5 in this application.

[0026] Figure 8 This is a structural diagram of step 3 of the construction steps 4 to 5 of this application.

[0027] Figure 9 This is a structural diagram of step 4 of the construction steps 4 to 5 of this application.

[0028] In the diagram: 1-First building structure, 2-Second building structure, 3-Cross passageway top slab, 4-Top C-shaped beam, 5-Cross passageway bottom slab, 6-Bottom passageway beam, 7-Transfer passageway, 8-Existing structure side wall, 9-Temporary support for initial demolition, 10-Support column; 401-Upper beam body for initial pouring, 402-Lower beam body for secondary pouring, 403-Beam segment for initial demolition, 404-Beam segment for secondary demolition, 801-Wall opening for initial demolition, 802-Side wall for secondary demolition. Detailed Implementation

[0029] The present application will be further described below with reference to specific embodiments and accompanying drawings.

[0030] Example

[0031] refer to Figures 1-9 As shown, an underground concrete structure connection structure based on C-shaped beams includes a first building structure 1, a second building structure 2, a passage top slab 3, a top C-shaped beam 4, a passage bottom slab 5, a bottom passage beam 6, a transfer passage 7, existing structure side walls 8, temporary supports for one-time removal 9, and support columns 10.

[0032] The first building structure 1 is connected to one end of the passageway top plate 3, and the other end of the passageway top plate 3 is connected to the top C-shaped beam 4. The groove of the top C-shaped beam 4 faces the second building structure 2 and engages with the second building structure 2. The first building structure 1 is connected to one end of the passageway bottom plate 5, and the other end of the passageway bottom plate 5 is connected to the bottom passageway beam 6. The bottom passageway beam 6 is connected to the second building structure 2. A support column 10 is provided between the top C-shaped beam 4 and the bottom passageway beam 6.

[0033] A transfer passage 7 is formed between the top slab 3 and the bottom slab 5 of the passage, connecting the first building structure 1 and the second building structure 2. A beam-column system is newly constructed by opening nodes in the side wall of the second building structure 2 through the top C-shaped beam 4, the bottom passage beam 6, and the supporting columns 10. The beams act on the second building structure 2 from above and below, and the supporting columns 10 support the upper and lower beams to meet the building's functional requirements and ensure structural safety.

[0034] The ordinary beams (especially those with open sections) in the second building structure 2 have relatively weak torsional stiffness. Under conditions of staggered floor slabs and uneven loads in the subway station (such as train vibrations and crowd loads) or seismic forces, they may suffer torsional failure. The closed or reinforced design of the newly constructed C-shaped beams can effectively resist such loads. The cross-sectional shape of the C-shaped beams (similar to channel steel) gives them good load distribution capabilities in both the transverse and longitudinal directions, enabling them to efficiently transfer the load from the top slab to the supporting structure, reduce local stress concentration, and improve overall stability.

[0035] Both the first building structure 1 and the second building structure 2 are subway station concourse levels, forming a transfer passage 7 that can meet the transfer needs of passengers between the two concourse levels. The top structure (floor slab or beam) of the concourse level connects to the top slab 3 or top C-shaped beam of the passage, and the bottom structure (floor slab and beam) of the concourse level connects to the bottom slab 5 or bottom beam 6 of the passage. The first building structure 1 is an existing building structure or a newly built building structure, and the second building structure 2 is an existing building structure. That is, the first building structure 1 is an existing building or a newly built building with connection conditions, and the second building structure 2 is an existing building without connection conditions.

[0036] The first building structure 1 connects the top slab 3 and the bottom slab 5 of the passageway via rebar anchoring. The second building structure 2 connects the top C-shaped beam 4 and the bottom passageway beam 6 via rebar anchoring, ensuring the reliability of the structural connections. The top slab 3 and the top C-shaped beam 4 are integrally cast and connected, and the bottom slab 5 and the bottom passageway beam 6 are integrally cast and connected. The floor slabs and beams are cast simultaneously, which can improve construction efficiency.

[0037] To ensure seamless integration between the C-beam and the existing structure, and considering the construction challenges, a phased casting process was adopted (first, the upper half was cast simultaneously with the roof slab, then the side walls were removed to complete the lower half), adapting to the cut-and-cover reverse construction environment. The top C-beam 4 comprises a single-cast upper beam 401 and a secondary-cast lower beam 402. The passageway roof slab 3 connects to the single-cast upper beam 401, and the single-cast upper beam 401 connects to the secondary-cast lower beam 402. The secondary-cast lower beam 402 connects to the support column 10. Both the single-cast upper beam 401 and the secondary-cast lower beam 402 are L-shaped structures, which are combined to form a C-shaped structure.

[0038] The top slab 3 of the passageway is integrally cast and connected to the upper beam 401 of the primary casting, and the lower beam 402 of the secondary casting is integrally cast and connected to the support column 10. This reduces the difficulty of construction, allows for precise control of structural connections, avoids large-scale excavation, reduces interference with existing structures, and improves construction safety.

[0039] The upper beam 401 is poured simultaneously with the top slab 3 of the passageway in the first pour, and the lower beam 402 is poured simultaneously with the support column 10 in the second pour. The upper beam 401 poured in the first pour is connected to the lower beam 402 poured in the second pour through a steel bar connector. That is, the steel bar is extended between the two pours through the steel bar connector to ensure that the beams poured in the subsequent two pours form a whole for stress.

[0040] The secondary-cast lower beam 402 includes primary demolition beam segments 403 and secondary demolition beam segments 404. The primary demolition beam segments 403 are arranged at intervals and are connected to the support columns 10. The secondary demolition beam segments 404 are connected between the primary demolition beam segments 403. The support columns 10 are equipped with temporary primary demolition supports 9.

[0041] That is, the secondary casting of the lower beam 402 adopts segmented construction. First, the existing structural side wall 8 is demolished in segments to form a primary demolition wall opening 801. A primary demolition temporary support 9 (steel section) is installed in the primary demolition wall opening 801. Then, the primary demolition beam segment 403 and the support column 10 are constructed. Then, the remaining secondary demolition side wall 802 is demolished, and the secondary demolition beam segment 404 is constructed.

[0042] The C-beam manufacturing process is as follows: Figure 1 For example, the first building structure 1 and the second building structure 2 → Figure 2 Construction of the new structural passageway top slab and the upper half of the C-shaped beam → as follows Figure 3 Construction of the new structural passageway floor slab and passageway beams → as follows Figure 4 Demolition of existing structural side walls → such as Figure 5 Construction of the lower half of the C-shaped beam and the structural columns under the beam.

[0043] The demolition of existing railway line side walls will be carried out in stages according to the existing structural conditions: such as Figure 6 Remove the existing structural side walls and install temporary steel supports at the corresponding column locations → as shown Figure 7 Construction has already removed the structural columns and the lower half of the C-beams within the side wall area → as shown Figure 8 Demolish the remaining existing structural sidewalls → as follows Figure 9 Construction continues on the lower half of the C-shaped beam.

[0044] The foregoing basic examples and their further alternative examples can be freely combined to form multiple embodiments, all of which are embodiments that can be adopted and claimed in this application. In the scheme of this application, each alternative example can be arbitrarily combined with any other basic example and alternative example.

[0045] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A connection structure for underground concrete structures based on C-shaped beams, comprising a first building structure (1) and a second building structure (2), characterized in that: The first building structure (1) is connected to one end of the passage top plate (3), and the other end of the passage top plate (3) is connected to the top C-beam (4). The slot of the top C-beam (4) faces the second building structure (2) and engages with the second building structure (2). The first building structure (1) is connected to one end of the passage bottom plate (5), and the other end of the passage bottom plate (5) is connected to the bottom passage beam (6). The bottom passage beam (6) is connected to the second building structure (2). A support column (10) is provided between the top C-beam (4) and the bottom passage beam (6).

2. The underground concrete structure connection and communication structure based on C-shaped beams according to claim 1, characterized in that: Both the first building structure (1) and the second building structure (2) are subway station concourse levels.

3. The underground concrete structure connection and communication structure based on C-shaped beams according to claim 1 or 2, characterized in that: The first building structure (1) is an existing building structure or a newly built building structure, and the second building structure (2) is an existing building structure.

4. The underground concrete structure connection and communication structure based on C-shaped beams according to claim 1, characterized in that: The first building structure (1) connects the top plate (3) and bottom plate (5) of the passage by rebar installation, and the second building structure (2) connects the top C-beam (4) and bottom passage beam (6) by rebar installation.

5. The underground concrete structure connection and communication structure based on C-shaped beams according to claim 1 or 4, characterized in that: The top plate (3) of the passage is integrally cast and connected to the top C-shaped beam (4), and the bottom plate (5) of the passage is integrally cast and connected to the bottom passage beam (6).

6. The underground concrete structure connection and communication structure based on C-shaped beams according to claim 1, characterized in that: The top C-shaped beam (4) includes a primary cast upper beam (401) and a secondary cast lower beam (402). The channel top plate (3) is connected to the primary cast upper beam (401), the primary cast upper beam (401) is connected to the secondary cast lower beam (402), and the secondary cast lower beam (402) is connected to the support column (10).

7. The underground concrete structure connection and communication structure based on C-shaped beams according to claim 6, characterized in that: The channel top plate (3) is integrally cast and connected with the upper beam (401) cast in the first stage, and the lower beam (402) cast in the second stage is integrally cast and connected with the support column (10).

8. The underground concrete structure connection and communication structure based on C-shaped beams according to claim 6 or 7, characterized in that: The upper beam (401) cast in one go is connected to the lower beam (402) cast in two stages via a steel bar connector.

9. The underground concrete structure connection and communication structure based on C-shaped beams according to claim 6, characterized in that: The secondary cast lower beam (402) includes a primary demolition beam segment (403) and a secondary demolition beam segment (404). The primary demolition beam segments (403) are arranged at intervals. The primary demolition beam segments (403) are connected to the support column (10). The secondary demolition beam segments (404) are connected between the primary demolition beam segments (403).

10. The underground concrete structure connection and communication structure based on C-shaped beams according to claim 1 or 9, characterized in that: The support column (10) is equipped with a temporary support (9) that can be removed once.

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