A longitudinal beam connecting structure of a prefabricated station

Abstract

The utility model relates to underground engineering construction technical field especially, and a kind of longitudinal beam connecting structure of prefabricated station, the longitudinal beam is assembled by several prefabricated longitudinal beam single section component, wherein several the negative bending moment stress area of the prefabricated longitudinal beam single section component is provided with reserved anchor cable tensioning hole, several the positive bending moment stress area of the prefabricated longitudinal beam single section component is provided with embedded force steel plate, several the negative bending moment stress area between the prefabricated longitudinal beam single section component is connected fixed by wearing and drawing prestressed anchor cable, several the positive bending moment stress area between the prefabricated longitudinal beam single section component is connected fixed by embedding force steel plate.The utility model has the advantages of: improving construction efficiency;Enhance structural safety;Reasonably control engineering cost;Adapt to complex geological conditions;Promote green construction;Not only solve many problems in prior art, also bring the promotion of construction efficiency, cost reduction, the enhancement of structural safety, with significant technical advantage and wide application prospect.

Description

Technical Field

[0001] This utility model relates to the field of underground engineering construction technology, and in particular to a longitudinal beam connection structure for a prefabricated station, which is especially suitable for the construction of underground stations in urban subway, suburban railway and other rail transit systems. Background Technology

[0002] With the continuous improvement of underground space development in my country, prefabricated modular subway stations are being used more and more widely, such as in the Changchun Metro prefabricated station and the Shasan Station of the second phase of Shenzhen Metro Line 12.

[0003] Pipe jacking technology has been widely used in various fields such as municipal pipelines and water conservancy projects, but it is still in the exploratory stage in the application of subway stations. Pipe jacking stations can be regarded as a special type of prefabricated assembled subway station, which can cope with more complex surrounding environments. It has particular advantages in scenarios where underground obstacles such as overpasses and underpasses of existing structures are present, which can avoid or reduce large-scale ground excavation and minimize the impact of construction on urban operations.

[0004] For example, the prefabricated station of Changchun Metro is a two-level underground island platform station built by open excavation, using a single-arch large-span design. Therefore, its main stress form is circumferential stress, eliminating the need for longitudinal beams along the track direction and thus avoiding the longitudinal beam connection problem. China's first ultra-large cross-section combined rectangular pipe jacking station was successfully completed at Shasan Station on Phase II of Shenzhen Metro Line 12. This station uses a double-tunnel close-fitting pipe jacking method. The longitudinal beams are constructed by inserting pre-reserved steel sections into precast components, and then encasing the steel sections with a U-shaped concrete structure poured on the outside of the left and right longitudinal beam structures, thus forming an integral load-bearing structure.

[0005] Overall, the application of prefabricated assembly and pipe jacking technologies in subway station construction not only improves construction efficiency and project quality but also helps reduce environmental impact, making it an important development direction in the field of urban rail transit construction.

[0006] However, existing pipe jacking technology still faces some challenges and shortcomings during implementation. For stations constructed using single-tunnel jacking with rectangular cross-sections, the longitudinal beams play a crucial role in the subway station structure: due to the stress characteristics of the rectangular cross-section, the longitudinal beams cannot be eliminated; at the same time, under single-tunnel jacking conditions, the segmented connection method used in double-tunnel jacking stations cannot be referenced, thus leaving considerable room for innovation and improvement in its connection methods.

[0007] Meanwhile, current prefabricated assembly stations mainly employ open-cut excavation combined with prefabricated component construction. These stations typically feature a horseshoe-shaped cross-section, with the main stress direction of the prefabricated components set circumferentially. The longitudinal beams along the track direction are also optimized accordingly, eliminating the need to consider longitudinal beam connections. However, for subway stations constructed using single-tunnel jacking with rectangular cross-sections, the construction method still requires longitudinal beams to bear vertical loads and maintain the overall rigidity of the station. Traditional pipe jacking construction methods, more similar to open-cut prefabricated assembly stations, do not require longitudinal component connections, thus necessitating a more optimized longitudinal beam connection method. Summary of the Invention

[0008] The purpose of this utility model is to address the shortcomings of the prior art by providing a longitudinal beam connection structure for a prefabricated station. Through the prefabrication design of individual longitudinal beam components and the design of connection nodes, the model solves the problems of low construction efficiency, insufficient structural safety, and high cost in the prior art.

[0009] The objective of this utility model is achieved through the following technical solution:

[0010] A longitudinal beam connection structure for a prefabricated railway station includes longitudinal beams, characterized in that: the longitudinal beams are assembled from several prefabricated single-section longitudinal beam components, wherein the negative bending moment stress zones of the several prefabricated single-section longitudinal beam components are provided with reserved anchor cable tensioning holes, the positive bending moment stress zones of the several prefabricated single-section longitudinal beam components are provided with embedded load-bearing steel plates, the negative bending moment stress zones of the several prefabricated single-section longitudinal beam components are connected and fixed together by threading prestressed anchor cables to form an integral whole, and the positive bending moment stress zones of the several prefabricated single-section longitudinal beam components are connected and fixed together by the embedded load-bearing steel plates to form an integral whole.

[0011] The precast longitudinal beam section is a T-shaped structure. Along the connection direction of the longitudinal beam, the lower longitudinal dimension of the precast longitudinal beam section is smaller than the upper longitudinal dimension, forming a joint area. A wet joint is provided between the lower parts of adjacent precast longitudinal beam sections.

[0012] The wet joint is a C55 micro-expansion concrete wet joint.

[0013] The adjacent pre-embedded load-bearing steel plates are connected by bolts.

[0014] Shear studs are provided on the embedded load-bearing steel plate.

[0015] The reserved anchor cable tensioning holes are set on the structural steel bars of the precast longitudinal beam single section component.

[0016] Several pre-reserved anchor cable tensioning holes are evenly spaced along the transverse direction on the precast longitudinal beam section.

[0017] The advantages of this utility model are:

[0018] 1) Improved construction efficiency: By adopting prefabricated longitudinal beams produced in factories and modular temporary support systems, the amount of on-site work during construction is greatly reduced, thereby significantly improving construction speed and efficiency. The rapid assembly and connection of prefabricated components shortens the construction cycle of the entire station structure.

[0019] 2) Enhanced Structural Safety: By utilizing prestressed technology and novel connection node design, the load-bearing capacity of the longitudinal beam connections and the overall structural stiffness are significantly enhanced. This connection method can effectively resist the influence of live and dead loads such as train dynamic loads, ensuring the long-term stability and safety of the station structure. Simultaneously, the introduction of a modular temporary support system ensures that the longitudinal beam connections are carried out under the action of the temporary support system, thus preventing abrupt changes in the structural stress system.

[0020] 3) Reasonable control of project costs: The application of precast longitudinal beams and new connection systems reduces the materials and labor required for on-site construction, such as formwork, thus facilitating more reasonable control of project costs.

[0021] 4) Adaptable to complex geological conditions: The design of the new connection node takes into account the slight uneven settlement of the foundation, and the longitudinal beam connection can be achieved within a certain degree of error. This flexibility and adaptability enable the present invention to perform well in different underground environments.

[0022] 5) Promote green construction: By reducing on-site construction work and optimizing material use, this utility model helps to reduce resource consumption and waste generation during the construction process, which is in line with the concept of green construction and sustainable development.

[0023] In summary, this utility model not only solves many problems in the prior art, but also improves construction efficiency, reduces costs, and enhances structural safety, demonstrating significant technical advantages and broad application prospects. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0025] Figure 2 This is a longitudinal sectional view of the present invention (connection completed).

[0026] Figure 3 This is an overall longitudinal sectional view of the present invention;

[0027] Figure 4 This is a cross-sectional view of the present invention;

[0028] Figure 5 This is a longitudinal sectional view (detail) of the present invention. Detailed Implementation

[0029] The features and other related features of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate the understanding of those skilled in the art:

[0030] like Figure 1-5 As shown, each mark represents: 1. Precast longitudinal beam single section component, 2. Prestressed anchor cable, 3. Embedded load-bearing steel plate, 4. Wet joint, 5. Shear stud, 6. Structural reinforcement, 7. Connecting bolt, 8. Reserved anchor cable tensioning hole, 9. Temporary support system, 10. Central column.

[0031] Example: Figures 1 to 5 As shown, the longitudinal beam connection structure of a prefabricated station in this embodiment includes an assembled longitudinal beam, which is composed of several prefabricated longitudinal beam segments 1. Each prefabricated longitudinal beam segment 1 has a T-shaped structure. Along the connection direction (longitudinal direction) of the longitudinal beam, the lower longitudinal dimension of the prefabricated longitudinal beam segment is smaller than the upper longitudinal dimension, forming a joint area, such as... Figure 2 As shown.

[0032] like Figure 4 As shown, pre-reserved anchor cable tensioning holes 8 are provided in the negative bending moment stress zone of each precast longitudinal beam single-section member 1; in this embodiment, five pre-reserved anchor cable tensioning holes 8 are evenly spaced laterally at the cross-sectional and transverse parts (negative bending moment stress zone) of the T-shaped precast longitudinal beam single-section member 1, and the five pre-reserved anchor cable tensioning holes 8 are located above the structural steel bars 6 of the precast longitudinal beam single-section member 1, and the two are staggered to avoid mutual interference. Figure 1 As shown, the negative bending moment stress zones of several precast longitudinal beam single-section components 1 are connected and fixed by aligning the reserved anchor cable tensioning holes 8 and then pulling the prestressed anchor cables 2 through them, so that each precast longitudinal beam single-section component 1 is connected and fixed to form an integral structure.

[0033] Combination Figure 2 and Figure 5 As shown, embedded load-bearing steel plates 3 are provided in the positive bending moment stress zone of each precast longitudinal beam segment 1. Shear studs 5 are uniformly arrayed and welded above the embedded load-bearing steel plates 3 to improve the connection performance between the embedded load-bearing steel plates 3 and the precast longitudinal beam segment 1, thereby further improving the structural stress performance of the embedded load-bearing steel plates 3 themselves. Figure 5 As shown, in this embodiment, the two ends of the embedded load-bearing steel plate 3 extend beyond the lower structure of the precast longitudinal beam single-section member 1 and have a certain upward or downward curvature to meet the docking requirements with the other embedded load-bearing steel plate on both sides. At the same time, the extension length of the embedded load-bearing steel plate 3 is also within the joint area. The positive bending moment stress areas of adjacent precast longitudinal beam single-section members 1 are connected and fixed to form an integral structure by connecting bolts 7.

[0034] Combination Figure 1 and Figure 5As shown, after each precast longitudinal beam section 1 is connected by prestressed anchor cables 2 and embedded load-bearing steel plates 3, C55 micro-expansion concrete is used to pour wet joints 4 at the lower joint area of ​​each precast longitudinal beam section 1, thereby completing the overall construction of the precast longitudinal beam section 1.

[0035] This embodiment includes the following steps during construction:

[0036] 1) Connection Preparation: Prestressed anchor cable perforations 8 are installed in the negative bending moment stress zone of the precast longitudinal beam single-section component 1, and pre-embedded load-bearing steel plates 3 are used in the positive bending moment stress zone, with shear studs 5 installed. The components are precast as a whole according to the station structure, with pre-reserved connection heads. After precasting, they are sequentially jacked in a ring-by-ring manner with the assistance of a temporary support system 9. During this process, the positions of some precast longitudinal beam single-section components 1 corresponding to the central columns 10 of the station structure are sufficiently stable and supported.

[0037] 2) Connection of prestressed anchor cable 2: In the negative bending moment zone, the prestressed anchor cable 2 is threaded through and tensioned to the design prestress, and the anchor cable is grouted.

[0038] 3) Connection of pre-embedded load-bearing steel plates 3: The pre-embedded load-bearing steel plates 3 of adjacent rings are connected in the joint area using connecting bolts 7.

[0039] 4) Wet joint pouring: After checking that all connecting bolts 7 are in the correct position, pour wet joint 4 with C55 micro-expansion concrete and remove temporary support system 9.

[0040] Although the above embodiments have described the concept and embodiments of the present invention in detail with reference to the accompanying drawings, those skilled in the art will recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, and therefore will not be elaborated here.

Claims

1. A longitudinal beam connection structure for a prefabricated railway station, comprising longitudinal beams, characterized in that: The longitudinal beam is assembled from several prefabricated single-section longitudinal beam components. The negative bending moment stress areas of several prefabricated single-section longitudinal beam components are provided with reserved anchor cable tensioning holes, and the positive bending moment stress areas of several prefabricated single-section longitudinal beam components are provided with embedded stress-bearing steel plates. The negative bending moment stress areas of several prefabricated single-section longitudinal beam components are connected and fixed to form a whole by threading prestressed anchor cables, and the positive bending moment stress areas of several prefabricated single-section longitudinal beam components are connected and fixed to form a whole by connecting and fixing the embedded stress-bearing steel plates.

2. The longitudinal beam connection structure of a prefabricated station according to claim 1, characterized in that: The precast longitudinal beam section is a T-shaped structure. Along the connection direction of the longitudinal beam, the lower longitudinal dimension of the precast longitudinal beam section is smaller than the upper longitudinal dimension, forming a joint area. A wet joint is provided between the lower parts of adjacent precast longitudinal beam sections.

3. The longitudinal beam connection structure of a prefabricated station according to claim 2, characterized in that: The wet joint is a C55 micro-expansion concrete wet joint.

4. The longitudinal beam connection structure of a prefabricated station according to claim 1, characterized in that: The adjacent pre-embedded load-bearing steel plates are connected by bolts.

5. The longitudinal beam connection structure of a prefabricated station according to claim 1 or 4, characterized in that: Shear studs are provided on the embedded load-bearing steel plate.

6. The longitudinal beam connection structure of a prefabricated station according to claim 1, characterized in that: The reserved anchor cable tensioning holes are set on the structural steel bars of the precast longitudinal beam single section component.

7. The longitudinal beam connection structure of a prefabricated station according to claim 1 or 6, characterized in that: Several pre-reserved anchor cable tensioning holes are evenly spaced along the transverse direction on the precast longitudinal beam section.

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