Underground excavation subway station intersection structure
By employing active support technologies such as prestressed anchor bolts, steel frames, and high-strength concrete layers in the cross-section structure of underground subway stations, the problem of frequent disassembly and assembly of support structures in traditional underground subway station cross-section structures has been solved, achieving an efficient and safe construction process.
Patent Information
- Application Number
- CN202520669809.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-10
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-04-10
AI Technical Summary
Traditional underground subway station intersection structures require frequent disassembly and reassembly of support structures, resulting in low economic efficiency and structural instability.
Active support technology is adopted, including prestressed anchors, steel frames, arch frames and high-strength concrete layers, to form an integrated support structure. The main station passage and the auxiliary structure passage are excavated simultaneously. Advanced small pipes are used to reinforce the strata at the intersection, reducing the need for repeated support.
It improved construction efficiency, reduced material and labor costs, enhanced structural stability and safety, and reduced construction risks.
Smart Images
Figure CN223794184U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of subway station construction technology, specifically to a structure for a tunnel-excavated subway station intersection. Background Technology
[0002] In urban rail transit construction, due to limitations imposed by surface traffic and urban pipelines, as well as land use issues, the cut-and-cover method has become the mainstream method for constructing urban subway stations. The traditional cut-and-cover station construction process typically involves first excavating and supporting the main station structure. Then, during the construction of the auxiliary structure passageways, the arch support of the existing main station needs to be reinforced, and the support at passageway intersections needs to be strengthened. Afterward, the connecting support structures at these intersections are removed to allow for the excavation of the auxiliary structure passageways.
[0003] Traditional cut-and-cover subway station intersection structures often require the dismantling and reassembly of support structures during construction, which is not only economically inefficient but also prone to structural instability. Therefore, this paper proposes a cut-and-cover subway station intersection structure specifically designed for applications in complex urban geological conditions and densely populated environments. Utilizing active support technology, it ensures that the surrounding rock can maximize its stability during construction, thereby making the connection process of multiple tunnels more stable and safer. Utility Model Content
[0004] To address the shortcomings of existing technologies, this utility model proposes a structure for a cut-and-cover subway station intersection, which solves the technical problem mentioned in the background art: the connection between the station and the passage in traditional cut-and-cover subway station intersection structures often requires disassembly and reassembly of the support structure, which is not only economically inefficient but also prone to structural instability.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a structure for a tunnel-cut subway station intersection, comprising:
[0006] The main station passage includes an upper step, a middle step, and a lower step, and a first support assembly is installed on the main station passage.
[0007] The auxiliary structure passage is connected to the main station passage and includes an upper step and a lower step for the auxiliary structure passage;
[0008] The second support component is installed at the connection between the main station passage and the auxiliary structure passage; and
[0009] The secondary lining of the arch wall is located inside the passage of the auxiliary structure.
[0010] In a preferred embodiment, the first support component includes:
[0011] Prestressed anchor bolts are arranged around the perimeter of the main station passageway;
[0012] Steel frames are arranged on both sides of the connection point between the main station passage and the auxiliary structure passage; and
[0013] An arch frame is installed at the top of the main station passageway.
[0014] In a preferred embodiment, the second support component includes:
[0015] A pre-installed small conduit is positioned on the auxiliary structure channel at the foot of the steel frame; and
[0016] Anchor bolts are installed at the landing points of the arch frame.
[0017] In a preferred embodiment, connecting bars are provided on both sides of the anchor bolt and the inner side of the arch frame, and prestressed anchor bolts are also provided on the tunnel wall of the auxiliary structure channel.
[0018] In a preferred embodiment, the steel frame is welded to the prestressed anchor rod and forms an integrated structure with the arch frame through the connecting bar.
[0019] In a preferred embodiment, the walls of the auxiliary structure passage are sprayed with a layer of high-strength concrete.
[0020] In a preferred embodiment, the main station is constructed with a reinforced concrete secondary lining, and the reinforced concrete secondary lining is connected to the auxiliary structure passage via beams and columns.
[0021] Compared with the prior art, the present invention has the following beneficial effects:
[0022] This utility model provides a method for constructing a cut-and-cover subway station intersection structure. By simultaneously excavating the main station tunnel and the auxiliary structure tunnel, continuous operation is allowed, enabling simultaneous construction of both the main tunnel and the auxiliary structure tunnel, effectively reducing the total project time. Timely implementation of the first support component and reinforcement measures accelerates the project flow, improves construction efficiency, and reduces the need for repeated support disassembly and assembly at critical locations such as intersections. Establishing a robust second support component layout in one go reduces the frequent support modifications and reconstructions required in traditional methods, saving material costs, reducing labor and management costs, improving economic efficiency, and avoiding instability caused by frequent support disassembly and assembly, thus enhancing construction safety.
[0023] This utility model provides an active support technology for the crossroads of a mined subway station, which employs prestressed anchor bolts and sprayed high-strength concrete layers. At key nodes such as the crossroads, advanced small guide pipes are used for ground reinforcement. The support structure is strengthened by using multiple steel frames and densely arranged arch frames, further reducing the safety risks during construction. Attached Figure Description
[0024] To more clearly illustrate the specific embodiments of this utility model, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.
[0025] Figure 1 This utility model provides a longitudinal section view of the intersection between the auxiliary structure passage and the main station structure in a mined-and-cover subway station intersection structure.
[0026] Figure 2 This is a cross-sectional view of the construction of the intersection between the auxiliary structure passage and the main station structure in a tunnel-excavated subway station intersection structure according to this utility model.
[0027] Figure 3 This is a schematic diagram of the connection structure between the steel frame and the anchor bolt in the cross-section structure of a tunneled subway station according to this utility model.
[0028] Figure label:
[0029] 1. Prestressed anchor bolts; 2. Prestressed guide pipes; 3. Concrete layer; 4. Reinforced concrete secondary lining; 5. Reinforced ring beam; 6. Horizontal beam column; 7. Locking anchor bolts; 8. Main station upper steps; 9. Auxiliary structure passage upper steps; 10. Steel frame; 11. Connecting bars; 12. Arch frame; 13. Main station middle steps; 14. Auxiliary structure passage lower steps; 15. Main station lower steps; 16. Arch wall secondary lining. Detailed Implementation
[0030] The present invention will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Those skilled in the art can make some non-essential improvements and adjustments to the present invention based on the above application content.
[0031] Example:
[0032] like Figures 1 to 3As shown, this utility model provides a cut-and-cover subway station intersection structure, including a main station passage, which includes an upper step 8, a middle step 13, and a lower step 15. A first support assembly is provided on the main station passage, which includes prestressed anchor rods 1 arranged around the main station passage. Steel frames 10 are arranged on both sides of the main station passage at the connection with the auxiliary structure passage, and an arch frame 12 is arranged on the top of the main station passage.
[0033] It also includes an auxiliary structure passage, which is connected to the main station passage. It includes an upper step 9 and a lower step 14 for the auxiliary structure passage. A second support component is provided at the connection between the main station passage and the auxiliary structure passage. The second support component includes a small guide tube 2 arranged on the auxiliary structure passage at the footing point of the steel frame 10. An anchor rod 7 is arranged at the footing point of the arch frame 12.
[0034] like Figure 2 , 3 As shown, in this embodiment, connecting bars 11 are provided on both sides of the anchor bolt 7 and the inner side of the arch frame 12, and prestressed anchor bolts 1 are also arranged on the tunnel wall of the auxiliary structure passage. The steel frame 10 is welded to the prestressed anchor bolts 1 and forms an integrated structure with the arch frame 12 through the connecting bars 11. A high-strength concrete layer 3 is sprayed on the tunnel wall of the auxiliary structure passage. A secondary arch wall lining 16 is provided on the inner side of the auxiliary structure passage, and a reinforced concrete secondary lining 4 is poured in the main station, and the reinforced concrete secondary lining 4 is connected to the auxiliary structure passage through crossbeams and columns 6.
[0035] First, pre-construction preparation and design are carried out. This includes designing the support system based on survey data, determining the configuration of prestressed anchors 1 and arch frames 12, and the thickness and strength of the shotcrete layer 3. By selecting a suitable type of prestressed anchor 1 based on the survey data, it can be ensured that the prestressed anchor 1 can provide sufficient prestress before excavation to actively restrain the surrounding rock and enhance structural safety.
[0036] Then, the guide tunnels for the upper step 8 and the middle step 13 of the main station were excavated, and prestressed anchor rods 1 were densely arranged and initial support was implemented. The prestressed anchor rods 1 were arranged in a quincunx pattern to ensure the stability of the excavation face.
[0037] When the main tunnel construction reaches the entrance, steel frames 10 are reinforced on both sides of the passage entrance in advance. Arch frames 12 and connecting bars 11 are reinforced at the top of the passage entrance, and the intersection is supported and strengthened. The specific steps for supporting and strengthening the intersection are as follows: When the main station tunnel is excavated to the intersection with the auxiliary passage, advance guide pipes 2 are driven into the arch frame 12 landing point along the opening outline to reinforce the strata at the intersection. Care should be taken to control the circumferential spacing and the external insertion angle to approximately 10°. In addition, anchor bolts 7 are installed along the opening outline of the main station tunnel arch frame 12 landing point, and connecting bars 11 are installed on both sides of the anchor bolts 7 and inside the arch frame 12.
[0038] During the excavation of the main station's upper step 8 and the main station's middle step 13 guide tunnel, the excavation of the auxiliary structure passage's upper step 9 was carried out simultaneously, and the initial support of the passage's arch was immediately implemented. The specific steps for implementing the initial support of the passage's arch were as follows: when the main structure support and the reinforcing ring beam 5, which are located within the interface range between the main structure and the auxiliary passage and extend at least 9 meters beyond the interface range, reach their design strength, multiple steel frames 10 can be erected at the intersection opening, and a layer of connecting reinforcement 11 is arranged both inside and outside the top of the passage entrance for reinforcement; the reinforced section of the passage is excavated using the step method, and prestressed anchor rods 1 are also installed on the tunnel wall of the auxiliary structure passage. After the prestressed anchor rods 1 are installed, a high-strength concrete layer 3 is sprayed onto the tunnel wall of the auxiliary structure passage to form an effective active support system.
[0039] like Figure 1 , 2 As shown, in this embodiment, a hydraulic breaker is used for precise excavation at the intersection of the upper step 8 and the guide tunnel of the middle step 13 of the main station. During the excavation of the intersection, the passage arch frame 12 is erected frame by frame to ensure that the passage steel frame 10 is welded to the prestressed anchor rod 1 and forms an integrated structure with the initial support arch frame 12 of the station through the connecting bar 11, so that the steel frame 10 and the arch frame 12 share the force and enhance the overall stability of the structure. Once the passage steel frame 10 at the intersection is completely closed into a ring, the next cycle of excavation work continues.
[0040] During the simultaneous excavation of the pilot tunnels for the main station lower bench 15 and the auxiliary structure passage lower bench 14, anchor bolts 7 are used to secure the main station to both sides of the arch frame 12 tangent to the arc. After the pilot tunnel on one side of the main tunnel bench is excavated and initial support is applied, the rock strata of the auxiliary structure passage lower bench 14 are excavated, and initial support is applied promptly. During the simultaneous excavation of the pilot tunnels for the main station lower bench 15 and the auxiliary structure passage lower bench 14, the length of each advance should not exceed the width of one steel frame 10.
[0041] Finally, the closure structure and secondary arch wall lining 16 are constructed. The specific steps for constructing the closure structure and secondary arch wall lining 16 are as follows: excavate the pilot tunnel 15 of the main station's lower step, close the initial support of the main station and the auxiliary structure passage, then lay the invert arch water layer, pour the secondary arch wall lining 16 of the tunnel invert arch, finally lay the arch wall waterproof layer, and pour the secondary arch wall lining 16 and internal structure of the main station and auxiliary structure passage. Reinforced concrete secondary lining 4 is poured inside the main station, and the reinforced concrete secondary lining 4 is connected to the auxiliary structure passage through crossbeams and columns 6 to further reinforce the intersection structure.
[0042] The specific usage and beneficial effects of this utility model are as follows:
[0043] This utility model provides a method for constructing a cut-and-cover subway station intersection structure. By simultaneously excavating the main station tunnel and the auxiliary structure tunnel, continuous operation is allowed, enabling simultaneous construction of both the main tunnel and the auxiliary structure tunnel, effectively reducing the total project time. Timely implementation of the first support component and reinforcement measures accelerates the project flow, improves construction efficiency, and reduces the need for repeated support disassembly and assembly at critical locations such as intersections. Establishing a robust second support component layout in one go reduces the frequent support modifications and reconstructions required in traditional methods, saving material costs, reducing labor and management costs, improving economic efficiency, and avoiding instability caused by frequent support disassembly and assembly, thus enhancing construction safety.
[0044] This utility model provides an active support technology for a tunneled subway station intersection structure, which employs prestressed anchor bolts 1 and sprayed high-strength concrete layers 3. At key nodes such as intersections, advanced small guide pipes 2 are used for ground reinforcement. Multiple steel frames 10 and arch frames 12 are arranged in a close-packed manner to strengthen the support structure, further reducing the safety risks during construction.
[0045] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above. Modifications or improvements can be made to this utility model, which is obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of this utility model fall within the scope of protection claimed by this utility model.
Claims
1. A structure of a cross passage of a subway station constructed by excavation, characterized in that, The utility model relates to a main station passage, an auxiliary structure passage and a second support component. The main station passage comprises a main station upper step (8), a main station middle step (13) and a main station lower step (15), and a first support component is arranged on the main station passage. The auxiliary structure passage is communicated with the main station passage and comprises an auxiliary structure passage upper step (9) and an auxiliary structure passage lower step (14). The second support component is arranged at the joint of the main station passage and the auxiliary structure passage. An arch wall secondary lining (16) is arranged inside the auxiliary structure passage. The first support component comprises prestressed anchor rods (1) arranged on the side of the main station passage, steel frames (10) arranged on both sides of the main station passage at the joint with the auxiliary structure passage, and arch frames (12) arranged on the top of the main station passage.
2. The structure of a cross passage of a subway station constructed by excavation according to claim 1, wherein The second support component comprises advanced small guide pipes (2) arranged at the foot of the steel frames (10) on the auxiliary structure passage, and locking foot anchor rods (7) arranged at the foot of the arch frames (12). The locking foot anchor rods (7) are provided with connecting ribs (11) on both sides and the inside of the arch frames (12), and prestressed anchor rods (1) are also arranged on the hole wall of the auxiliary structure passage. The steel frames (10) are welded with the prestressed anchor rods (1) and form an integrated structure with the arch frames (12) through the connecting ribs (11). A high-strength concrete layer (3) is sprayed on the hole wall of the auxiliary structure passage. A reinforced concrete secondary lining (4) is cast in the main station, and the reinforced concrete secondary lining (4) is connected with the auxiliary structure passage through cross beams (6).
3. The structure of a cross passage of a subway station according to claim 2, wherein 4. The structure of a cross passage of a subway station according to claim 3, wherein: 5. The structure of a cross passage of a subway station according to claim 4, wherein: 6. The structure of the intersection of the subway station constructed by excavation according to claim 1, wherein: 7. The structure of the intersection of the bored subway station according to claim 1, characterized in that: