New and old subway channel interface structure

Abstract

The utility model discloses a new and old subway channel interface structure which comprises a newly-built channel external interface and an existing channel structure. An assembly groove is formed in the end part of the newly-built channel external interface, and the end part of the existing channel structure extends into the assembly groove of the newly-built channel external interface; a rubber water-stop belt is arranged; after the newly-built channel external interface and the existing channel structure are aligned, a gap is formed in the end part of the newly-built channel external interface or the end part of the existing channel structure; and a polyurethane sealant and a water-swelling water-stopping adhesive tape are arranged at a gap between the external interface of the newly-built channel and the existing channel structure. According to the utility model, the assembling groove is arranged at the end part of the external interface of the new channel, and the end part of the existing channel structure extends into the assembling groove, so that the connection of the new structure and the old structure is realized, and the stability and the integrity of the interface are enhanced. And the waterproof performance of the interface is further enhanced by using the polyurethane sealant and the water-swelling water-stopping adhesive tape.

Description

Technical Field

[0001] This utility model relates to the technical field of renovation and expansion of subway station entrance and exit passages, specifically to an interface structure between old and new subway passages. Background Technology

[0002] With the accelerated construction of rail transit in my country, the number of multi-line transfer stations is gradually increasing. During the construction of these transfer stations, it is often necessary to renovate and expand existing pedestrian entrances and exits, or to build new passageways at the interfaces of existing station reserved passageways. Due to the differences in settlement and temperature deformation between the old and new structures, expansion joints are usually required at the interface. Numerous engineering cases show that waterproofing at the interface between new passageways and existing station reserved passageways is often difficult. Using existing conventional expansion joint methods can easily lead to water leakage at the interface, causing inconvenience to the normal operation of the subsequent pedestrian passageways.

[0003] When constructing transfer stations, the connection points between new and old structures are crucial for waterproofing. Differences in materials, construction techniques, and operating environments between the old and new structures can lead to varying degrees of deformation during use, causing stress concentration at the joints and affecting structural integrity and durability. Therefore, the design of expansion joints must consider not only the structural deformation requirements but also waterproofing performance to ensure structural safety and functionality.

[0004] Utility model patent CN116770887B discloses a connection node between new and old subway station structures and its construction method. It relies on ultra-high performance concrete to avoid the adverse effects of high water pressure and strong seepage in the underground environment on the long-term service performance of the connection node. This type of technology relies on the inherent properties of the material itself. In some cases, it is difficult to obtain ultra-high performance concrete, thus the waterproofing problem at the interface remains unresolved. To improve the waterproofing performance at the interface, a solution needs to be designed for the connection between new and old structures to effectively reduce the risk of water leakage and ensure the long-term safe operation of transfer stations. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a new interface structure for old and new subway passages. Through structural design, the waterproof performance at the interface is improved and the risk of water leakage is reduced.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A new and old subway passage interface structure includes a new passage external interface and an existing passage structure; the end of the new passage external interface is provided with an assembly groove, and the end of the existing passage structure extends into the assembly groove of the new passage external interface;

[0008] A rubber waterstop is installed. The first part of the rubber waterstop is located in the end structure of the new channel's outer interface, and the second part of the rubber waterstop is located in the end structure of the existing channel structure. After the new channel's outer interface and the existing channel structure are aligned, a gap is formed at the end of the new channel's outer interface or the end of the existing channel structure. The rubber waterstop is annular. The first part of the annular rubber waterstop is located at the bottom of the assembly groove, and the second part of the annular rubber waterstop extends from the end face of the existing channel structure into the interior of the existing channel structure.

[0009] Polyurethane sealant and water-swellable sealing strips are installed at the gap between the new channel's external interface and the existing channel structure. Polyurethane sealant is installed at both ends of the gap between the new channel's external interface and the existing channel structure, and water-swellable sealing strips are installed in the gap between the new channel's external interface and the existing channel structure. The water-swellable sealing strips are looped around the ends of the existing channel structure.

[0010] As a preferred method, the gap between the new channel external interface and the existing channel structure is an L-shaped gap (the cross-section of the gap between the new channel external interface and the existing channel structure is L-shaped), and at least one ring of polyurethane sealant is applied to both ends of the L-shaped gap; the L-shaped gap includes a horizontal section and a vertical section, and the rubber waterstop is located at the vertical section.

[0011] As a preferred method, the water-swellable sealing strip contacts the side wall of the assembly groove, or the water-swellable sealing strip contacts the assembly groove after it swells in water.

[0012] As a preferred approach, waterproof layers are installed on the external interfaces of newly built channels and on the exterior of existing channel structures. Adding an external waterproof layer is beneficial for overall waterproofing.

[0013] As a preferred method, the waterproof layer is formed by waterproof membrane, which covers the outer interface of the new passage and the outer structure of the existing passage.

[0014] In a preferred embodiment, the end of the newly constructed channel external interface is an assembly section, which includes an extension section and a transition section. The extension section serves as the sidewall of the assembly groove, and the transition section is located between the extension section and the main body of the newly constructed channel external interface. In a preferred embodiment, the transition section includes an inclined wall, which forms an obtuse angle structure with the main body of the newly constructed channel external interface.

[0015] As a preferred embodiment, the obtuse angle of the obtuse angle structure ranges from 120° to 160°, including the endpoints 120° and 160°. As a preferred embodiment, the obtuse angle of the obtuse angle structure ranges from 150°.

[0016] As a preferred embodiment, the wall thickness of the extension section is t, the depth of the assembly groove is t, and the wall thickness of the main body of the newly built channel external interface is t.

[0017] This utility model has at least the following beneficial effects: By setting an assembly groove at the end of the new passage's external interface and allowing the end of the existing passage structure to extend into the assembly groove, the connection between the new and old structures is achieved, enhancing the stability and integrity of the interface. The rubber waterstop effectively solves the waterproofing problem at the interface. The rubber waterstop is divided into two parts, located in the external interface of the new passage and the end structure of the existing passage structure, respectively. When the two are aligned, the rubber waterstop forms a ring seal at the interface, effectively preventing water penetration. The use of polyurethane sealant and water-swellable sealing strip further enhances the waterproofing performance of the interface. The polyurethane sealant fills the gaps at both ends of the new passage's external interface and the existing passage structure, while the water-swellable sealing strip is looped around the end of the existing passage structure in a ring shape. Upon contact with water, it expands, thus sealing the gaps more tightly and improving the waterproofing effect. Through structural design and the use of multiple waterproofing measures such as rubber waterstop and sealant, this utility model ensures the sealing and stability of the interface between the new and old subway passages, improves the waterproofing performance at the interface, and reduces the risk of water leakage. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show the embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the longitudinal section structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the newly built channel external interface of this utility model;

[0022] Figure 4 This is a partial schematic diagram of the newly built channel external interface mentioned in the embodiment;

[0023] In the diagram, 1-existing channel structure, 2-new channel external interface, 3-rubber waterstop, 4-water-swellable sealing strip, 5-polyurethane sealant, 6-waterproof membrane, 7-first longitudinal reinforcement, 8-second longitudinal reinforcement, 9-connecting reinforcement, 10-distribution reinforcement. Detailed Implementation

[0024] The technical solution of this utility model is described in further detail below with reference to the accompanying drawings, but the scope of protection of this utility model is not limited to the following description.

[0025] In the following description, different embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that the present disclosure is not intended to be limited to the specific forms disclosed herein, but rather should be interpreted as covering various changes, equivalents, and / or substitutions of the embodiments of the present disclosure. In describing the drawings, similar reference numerals may be used to indicate similar constituent elements.

[0026] In this disclosure, terminology is used to describe particular embodiments and is not intended to limit the disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. It should be understood in the specification that the terms “comprising” or “having” indicate the presence of a feature, number, step, operation, structural element, component, or combination thereof, without precluding the possibility of the presence or addition of one or more other features, numbers, steps, operations, structural elements, components, or combinations thereof.

[0027] It should be understood that specific details are provided in the following description to facilitate a complete understanding of the exemplary embodiments. However, those skilled in the art will understand that the exemplary embodiments can be implemented without these specific details. For example, the system may be shown in block diagrams to avoid obscuring the example with unnecessary details. In other instances, well-known processes, structures, and techniques may be omitted with non-essential details to avoid obscuring the example.

[0028] like Figure 1 As shown, a new and old subway passage interface structure includes a new passage external interface 2 and an existing passage structure 1; the end of the new passage external interface 2 is provided with an assembly groove, and the end of the existing passage structure 1 extends into the assembly groove of the new passage external interface 2.

[0029] A rubber waterstop 3 is installed. The first part of the rubber waterstop 3 is located in the end structure of the new channel external interface 2, and the second part of the rubber waterstop 3 is located in the end structure of the existing channel structure 1. After the new channel external interface 2 and the existing channel structure 1 are aligned, a gap (or expansion joint) is formed at the end of the new channel external interface 2 or the end of the existing channel structure 1. The rubber waterstop 3 is annular. The first part of the annular rubber waterstop 3 is located at the bottom of the assembly groove, and the second part of the annular rubber waterstop 3 extends from the end face of the existing channel structure 1 into the interior of the existing channel structure 1. In practice, the rubber waterstop 3 pre-embedded at the interface position of the existing channel structure 1 is first peeled off, the steel bars of the new channel are tied, and the joint of the existing waterstop is buried in the structure of the new channel.

[0030] Polyurethane sealant 5 and water-swellable sealing strip 4 are installed at the gap between the new channel external interface 2 and the existing channel structure 1. Polyurethane sealant 5 is installed at both ends of the gap between the new channel external interface 2 and the existing channel structure 1. The water-swellable sealing strip 4 is installed in the gap between the new channel external interface 2 and the existing channel structure 1 and is looped around the end of the existing channel structure 1.

[0031] To address the problem of poor waterproofing at expansion joints between new and old subway tunnel interfaces, this embodiment provides a structural measure for such joints. A socket joint is used for connection at the interface between the new and old tunnel structures. Waterproofing measures, including a water-stop strip, a water-swellable waterproofing strip 4, and sealant, are installed at the expansion joint between the socket joints of the new and old structures, resulting in good waterproofing performance.

[0032] In a preferred embodiment, the gap between the newly constructed channel external interface 2 and the existing channel structure 1 is an L-shaped gap (the cross-section of the gap between the newly constructed channel external interface 2 and the existing channel structure 1 is L-shaped), and at least one ring of polyurethane sealant 5 is applied to both ends of the L-shaped gap. The L-shaped gap includes a horizontal section and a vertical section, with the rubber waterstop 3 located at the vertical section. This invention provides a water-swellable sealing strip 4 at the center of the interface between the newly constructed channel structure and the existing channel structure 1, and simultaneously provides a layer of polyurethane sealant 5 at both the upper and lower edges of the expansion joint at the interface.

[0033] In a preferred embodiment, the water-swellable sealing strip 4 contacts the side wall of the assembly groove, or the water-swellable sealing strip 4 contacts the assembly groove after it swells in water.

[0034] In a preferred embodiment, such as Figure 1 and Figure 2 As shown, the newly built channel external interface 2 and the existing channel structure 1 are equipped with waterproof layers.

[0035] In a preferred embodiment, the waterproof layer is formed of a waterproof membrane 6, which covers both the outer interface 2 of the new passage and the existing passage structure 1. A key feature of this embodiment is that the new passage structure and the existing structure are connected by a rubber waterstop 3 at the midpoint, and an outer waterproof membrane 6 is installed on the soil-facing side of the structure, enhancing the overall waterproofing effect. This embodiment relates to a construction measure for the expansion joint at the interface between a new and old subway passage. A socket joint is used for connection at the interface between the new and old passage structures. Four waterproofing measures are implemented at the expansion joint of the socket joint between the new and old structures: a waterstop, a water-swellable waterproof strip 4, sealant, and an outer waterproof membrane 6, resulting in good waterproofing performance.

[0036] In a preferred embodiment, the end of the newly created channel external interface 2 is an assembly part, which includes an extension section and a transition section. The extension section serves as the sidewall of the assembly groove, and the transition section is disposed between the extension section and the main body of the newly created channel external interface 2.

[0037] In a preferred embodiment, see Figure 1 The transition section includes an inclined wall, which forms an obtuse angle structure with the main body of the newly built channel external interface 2.

[0038] In a preferred embodiment, the obtuse angle of the obtuse angle structure is in the range of 120°-160° (inclusive of the endpoint values ​​of 120° and 160°).

[0039] In a preferred embodiment, the obtuse angle of the obtuse angle structure is within the range of 150°. In this embodiment, the newly built structure is used as the socket, and the existing channel structure 1 is used as the insertion port. The outward flank angle of the socket of the newly built channel structure can be 150°.

[0040] In a preferred embodiment, such as Figure 4 As shown, the wall thickness of the extension section is t, the depth of the assembly groove is t, and the wall thickness of the main body of the newly built channel outer interface 2 is t. These three parameters are consistent, and t can be taken as 30-80cm. Furthermore, the length of the extension section is 2t. In summary, the structural wall thickness t of the newly built socket expansion section is the same as the main body wall thickness t of the newly built channel outer interface 2. The length of the newly built socket expansion section can be taken as the wall thickness t.

[0041] This utility model relates to a construction measure for expansion joints at the interface between new and old subway passages, using a socket joint for connection at the interface. The socket joint construction effectively controls differential settlement and extends the leakage path. Four waterproofing measures are implemented at the expansion joint location between the new and old structures: a waterstop, a water-swellable waterproof strip 4, sealant, and an outer waterproof membrane 6, effectively reducing the risk of leakage at the expansion joint. Furthermore, this utility model has advantages such as low engineering cost, simple construction method, and high safety and reliability.

[0042] like Figure 3 As shown, in one embodiment, a reinforcement layout structure for a newly constructed channel external interface 2 is provided. In this embodiment, reinforcement bars are provided in both the main body and the assembly section of the newly constructed channel external interface 2, forming a reinforcement structure. The reinforcement structure includes distribution reinforcement bars 10, first longitudinal reinforcement bars 7, second longitudinal reinforcement bars 8, and connecting reinforcement bars 9. The distribution reinforcement bars 10 are ring-shaped. The first longitudinal reinforcement bars 7 and second longitudinal reinforcement bars 8 are arranged along the direction of the main body of the newly constructed channel external interface 2. The main body of the connecting reinforcement bars 9 is located in the assembly section, and a portion of the connecting reinforcement bars 9 extends into the main body of the newly constructed channel external interface 2.

[0043] In one embodiment, the distributed reinforcing bars 10 within the main body of the newly constructed channel external interface 2 are configured in two layers. The first layer of distributed reinforcing bars 10 is tied to the first longitudinal reinforcing bars 7, and the second layer of distributed reinforcing bars 10 is tied to the second longitudinal reinforcing bars 8. The connecting reinforcing bars 9 include a first horizontal bar, a second horizontal bar, a first vertical bar, a second vertical bar, and diagonal bars. The diagonal bars, the first horizontal bar, the first vertical bar, the second horizontal bar, and the second vertical bar are connected sequentially. The first horizontal bar, the second horizontal bar, the first vertical bar, the second vertical bar, and the diagonal bars are respectively connected to several distributed reinforcing bars 10 provided within the assembly section. For specific connection details, please refer to [reference needed]. Figure 3 .

[0044] In one embodiment, a method for constructing an expansion joint at the interface between a new and an old subway passage is also provided, the implementation steps of which are as follows:

[0045] a. Excavation of the foundation pit for the new channel, stripping out the joint of the rubber waterstop 3 pre-embedded at the interface position of the existing channel structure 1;

[0046] b. Tie the longitudinal reinforcement of the newly constructed channel structure, tie the distribution reinforcement of the newly constructed channel structure (10mm), and tie the socket reinforcement of the newly constructed channel. The effective anchorage length of the reinforcement should meet the requirements of the specification. At the same time, embed the waterstop into the socket of the newly constructed channel structure.

[0047] c. A water-swellable sealing strip 4 is installed in the middle of the interface between the new channel structure and the existing channel structure 1. At the same time, polyurethane sealant 5 is installed at the upper and lower edges of the expansion joint at the interface.

[0048] d. Set up formwork and pour concrete for the new passageway structure.

[0049] e. Install an outer waterproof membrane 6 at the outer edge of the expansion joint at the interface between the newly built channel structure and the existing channel structure 1.

[0050] This utility model provides a structural design for an expansion joint at the interface between old and new subway passages. The expansion joint at the junction of the old and new structures incorporates four waterproofing measures: a water-stop strip, a water-swellable waterproofing strip 4, sealant, and an outer waterproof membrane 6, effectively reducing the risk of leakage at the expansion joint.

[0051] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention. The above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. It should be noted that any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A new and old subway passage interface structure, characterized in that: The new channel outer interface comprises an assembly groove at the end thereof, and the end of the existing channel structure extends into the assembly groove of the new channel outer interface. The rubber waterstop is provided with a first part in the end structure of the new channel outer interface and a second part in the end structure of the existing channel structure. The gap between the new channel outer interface and the existing channel structure is provided with polyurethane sealant and water-swelling waterproof adhesive tape.

2. The new and old subway passage interface structure according to claim 1, characterized in that: The gap between the new channel outer interface and the existing channel structure is provided with polyurethane sealant at both ends thereof, and the water-swelling waterproof adhesive tape is provided in the gap between the new channel outer interface and the existing channel structure.

3. The new and old subway passage interface structure according to claim 1, characterized in that: The water-swelling waterproof adhesive tape is annular and is sleeved around the end of the existing channel structure.

4. The new and old subway passage interface structure according to claim 1, characterized in that: The gap between the new channel outer interface and the existing channel structure is L-shaped, and at least one circle of polyurethane sealant is provided at both ends of the L-shaped gap.

5. The new and old subway passage interface structure according to claim 4, characterized in that: The water-swelling waterproof adhesive tape is in contact with the side wall of the assembly groove or is in contact with the assembly groove after swelling.

6. The new and old subway passage interface structure according to claim 1, characterized in that: A waterproof layer is provided outside the new channel outer interface and the existing channel structure.

7. The new and old subway passage interface structure according to claim 6, characterized in that: The waterproof layer is formed by waterproof roll material and is wrapped outside the new channel outer interface and the existing channel structure.

8. The new and old subway passage interface structure according to claim 7, characterized in that: The end of the new channel outer interface is an assembly part, which comprises an extension section and a transition section.

9. The new and old subway passage interface structure according to claim 8, characterized in that: The transition section comprises an inclined wall, and an obtuse angle structure is formed between the inclined wall and the main body of the new channel outer interface.

10. The new and old subway passage interface structure according to claim 6, characterized in that: The obtuse angle range of the obtuse angle structure is 120°-160°. The obtuse angle range of the obtuse angle structure is 150°. The wall thickness of the extension section is t, the depth of the assembly groove is t, and the wall thickness of the main body of the new channel outer interface is t.

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