Inspection well structure for deeply-buried ditch of single-track tunnel

Abstract

The utility model relates to a single-track tunnel deeply-buried ditch inspection well structural form, and relates to the technical field of tunnels. The inspection well structure comprises a cavern located on the side of the single-track tunnel, a transverse space located below the single-track tunnel and a vertical shaft communicating the cavern with the transverse space. A well mouth of the vertical shaft is located in the cavern, communicates with the under-rail space and is provided with a well lid and a heat preservation structure. A top plate of the under-rail space is a bottom plate of the single-track tunnel; a well mouth of the inspection well is arranged in the under-rail space and above the deeply-buried ditch, and the well mouth of the inspection well is provided with an inspection well lid. According to the method, the overall under-rail space is arranged below the tunnel, and the vertical shafts and the caverns are arranged on the side, so that the influence of the inspection well on the stress of the rail structure in the operation period and the operation of ballast rail maintenance machinery can be avoided.

Description

Technical Field

[0001] This application relates to the field of tunnel technology, and in particular to a structure for a deep-buried inspection well in a single-line tunnel. Background Technology

[0002] In my country's frigid regions, railway tunnels face significant challenges in drainage and frost protection after operation. Typical frost damage phenomena include water leakage and ice formation in the tunnel lining, water seepage and icing at the tunnel floor, and frost cracking and deformation of the lining. Research indicates that almost all frost damage issues are closely related to the tunnel's drainage system. Ultimately, water is a fundamental condition for tunnel frost damage. The key to preventing frost damage lies in effectively and quickly draining groundwater around the tunnel lining, preventing its accumulation, poor drainage, freezing, and frost heave, which can all negatively impact drainage and structural safety.

[0003] Currently, for tunnels in cold regions, considering factors such as tunnel climate, maximum soil freezing depth, surrounding rock conditions, and groundwater development, the main cold-weather protection measures adopted include: deeply buried central drainage ditches, insulated side drainage ditches, cold-weather drainage tunnels, electric heating, radial grouting, and insulated drainage outlets at the tunnel entrance. The principle of the deeply buried central drainage ditches is to bury the ditches below the corresponding freezing depth within the tunnel, utilizing natural ground temperature to prevent the water in the drainage ditches from freezing. In the cold-weather protection design system, the deeply buried central drainage ditches are the most crucial link in the tunnel drainage system. Located at the tunnel bottom, they connect the two side ditches in the track area and the drainage outlet at the tunnel entrance, serving as the main drainage channel for the tunnel body and the last line of defense for drainage after the side ditches freeze. The deeply buried central drainage ditches are also the most difficult part of the tunnel drainage system to maintain and repair. Located at the very bottom under the tunnel invert, they are a section that seriously interferes with other tunnel construction processes and whose construction quality is easily overlooked during construction. Utility Model Content

[0004] The embodiments of this disclosure provide a single-line tunnel deep-buried water ditch inspection well structure.

[0005] The embodiments of this disclosure provide a structure for a manhole in a deep-buried drainage ditch in a single-track tunnel, including: a chamber located on the side of the single-track tunnel, a track space located below the single-track tunnel, and a shaft connecting the chamber and the track space; the manhole opening of the shaft is located in the chamber, the bottom of the shaft is connected to the track space, and the manhole opening is equipped with a manhole cover and an insulation structure; the top slab of the track space is the bottom slab of the single-track tunnel; the manhole opening of the manhole is provided in the track space, above the deep-buried drainage ditch, and the manhole opening of the manhole is equipped with a manhole cover.

[0006] By applying the technical solution disclosed herein, an overall track-under-tunnel space is set up below the tunnel, and vertical shafts and chambers are set up on the side, which can avoid the impact of inspection wells on the stress of the track structure during operation and the operation of ballast track maintenance machinery.

[0007] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0008] The accompanying drawings are provided to better understand this solution and do not constitute a limitation of this disclosure. Wherein:

[0009] Figure 1 This is a schematic diagram of a single-line tunnel deep-buried water ditch inspection well structure according to an embodiment of the present disclosure.

[0010] Figure 2 This is a schematic diagram of another embodiment of the single-line tunnel deep-buried water ditch inspection well structure disclosed herein;

[0011] Figure 3 This is a schematic diagram showing the connection relationship between the insulated drainage pipe and the deep-buried water ditch in the single-line tunnel inspection well structure disclosed herein. Detailed Implementation

[0012] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of this disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains.

[0013] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0014] Where there is no conflict, the embodiments and features described herein can be combined with each other.

[0015] To make the technical solutions and advantages of this disclosure clearer, the following description, in conjunction with the accompanying drawings and specific embodiments, will provide a more detailed account of this disclosure.

[0016] Figure 1 A schematic diagram of one embodiment of the single-line tunnel deep-buried drainage ditch inspection well structure of this disclosure is shown. Figure 1 In this embodiment, the inspection well structure may include a chamber 1, a track space 2, and a vertical shaft 3.

[0017] Cavern 1 is located to the side of the single-track tunnel, and it can be a small chamber set up to the side of the single-track tunnel. In some specific practices, cavern 1 can be integrated with the cavern for evacuating users in the single-track tunnel.

[0018] The under-track space 2 is located beneath the single-track tunnel. The top slab of the under-track space 2 can serve as the floor slab of the single-track tunnel. In other words, the ground surface for vehicles traveling in the single-track tunnel is the top slab of the under-track space 2. The dimensions of the under-track space 2 can be determined based on the geological environment of each point within the single-track tunnel. Inspection wells 4 can be installed within the under-track space 2, and each well has a cover. Opening the inspection well cover allows for inspection and maintenance of the buried drainage ditch 5.

[0019] Shaft 3 connects cavern 1 and the under-rail space 2. The opening of shaft 3 can be located inside cavern 1, and the bottom of shaft 3 can connect to the under-rail space 2. The shaft can be located to the side of the under-rail space. Maintenance personnel can enter shaft 3 through cavern 1 and finally reach the under-rail space 2. The opening of shaft 3 can be equipped with a cover and insulation structure. The insulation structure is used to ensure that the temperature of the under-rail space 2 is maintained at a preset temperature value, preventing the water in the deep-buried trench from freezing.

[0020] The single-track tunnel deep-buried ditch inspection well structure provided in the above embodiments of this disclosure has an overall track-under-the-tunnel space set below the tunnel, and a vertical shaft and chamber set on the side, which can avoid the impact of the inspection well on the stress of the track structure during operation and the operation of ballast track maintenance machinery.

[0021] See also Figure 2 This illustrates a structural schematic diagram of another embodiment of the single-line tunnel deep-buried drainage ditch inspection well structure according to this disclosure. Figure 2 In the illustrated embodiment, in Figure 1 Based on the illustrated embodiment, the shaft 3 has an upper manhole cover 31 and a lower manhole cover 32 at its opening. An insulation structure 33 is positioned between the upper manhole cover 31 and the lower manhole cover 32. Specifically, the insulation structure 33 can be a cylinder, and its height can be determined based on the lowest temperature of the geological environment where the single-track tunnel is located. The upper manhole cover 31 and the lower manhole cover 32 have the same diameter, but their thicknesses can be the same or different, and their materials can be the same or different.

[0022] In addition, ladders are installed on the side walls of shaft 3. These ladders are used to allow maintenance personnel to enter from the shaft opening to the bottom of the shaft. The ladders can be multiple equally spaced metal structures embedded in the side walls for easy access by maintenance personnel.

[0023] exist Figure 1Based on the illustrated embodiment, the top plate of the inspection well in this embodiment is symmetrical about the centerline of the single-track tunnel. This creates a hollowed-out space beneath the surface of the single-track tunnel, forming an integral symmetrical structure. This ensures the integrity of the single-track tunnel track bed, does not affect the stress conditions of the track structure, improves the stress conditions of the tunnel structure, and enhances the overall load-bearing capacity and stability of the track structure.

[0024] In some specific practices, the top slab of the space beneath the track may include edge blocks and intermediate blocks. The edge blocks are equipped with steel reinforcement connectors for connection to the arch lining of the single-track tunnel. During construction, the top slab may consist of five precast slabs: three intermediate blocks and two edge blocks. Multiple hooks may be installed on these precast slabs to meet the needs of hoisting, flipping, and other construction operations. Furthermore, the precast blocks are engraved with assembly directions and alignment markings to minimize installation errors.

[0025] The aforementioned reinforcement of the under-track space and the use of the same grade of concrete for the base plate as the secondary lining concrete improve construction convenience.

[0026] In this embodiment, the lining thickness of chamber 1 can be determined based on the surrounding rock grade of the single-track tunnel. Specifically, a correspondence between the surrounding rock grade and the lining thickness can be preset. During construction, the lining thickness of the chamber is determined by querying this correspondence.

[0027] For sections of single-track tunnels without deeply buried drainage ditches, drainage holes can be installed on the side blocks. These drainage holes should be connected to the deeply buried drainage ditches via drainage pipes. Furthermore, these drainage pipes must be insulated. Specifically, an insulation structure can be installed on the outside of the drainage pipes. Figure 3 As shown.

[0028] The single-line tunnel deep-buried drainage ditch inspection well structure provided in the above embodiments of this disclosure saves on concrete masonry work and reduces project costs through the integrated design of the tunnel floor slab (or invert arch) and the inspection well cross passage. It also enables the prefabrication and assembly of the cross passage top slab, allowing for rapid hoisting and placement of the prefabricated slab after the cross passage is completed, meeting the passage requirements for construction vehicles and improving construction efficiency. Simultaneously, integrated construction reduces concealed works, lowers the difficulty of project implementation, helps improve project quality, and helps reduce the probability of later quality defects.

[0029] After the structure of the deep-buried water ditch inspection well in the single-track tunnel is completed, the maintenance personnel's route to and from the tunnel is as follows: personnel walk from the track area into the tunnel on one side of the track; open and remove the two-layer cover plate and the insulation structure at the bottom of the tunnel, and climb down through the vertical shaft ladder; walk through the cross passage to the middle of the passage, open the inspection well cover to carry out maintenance work; and return by doing the same thing in reverse.

[0030] The single-track tunnel deep-buried drainage ditch inspection well structure provided by the above embodiments of this disclosure effectively solves the problems of limited construction space, numerous hidden works, complex construction technology, low construction efficiency, and numerous structural quality defects in single-track tunnel central drainage ditch inspection wells in frigid regions. Adopting the solution of this disclosure in frigid regions greatly reduces construction difficulty, improves construction efficiency, improves the working environment, saves project costs and labor costs, reduces carbon emissions, and achieves the dual goals of social and economic benefits.

[0031] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A structure for a single-track tunnel deep-buried drainage ditch inspection well, comprising: The cavern located on the side of the single-track tunnel, the transverse space located below the single-track tunnel, and the vertical shaft connecting the cavern and the transverse space; The shaft opening is located inside the cavern, the bottom of the shaft is connected to the space under the rail, and the shaft opening is equipped with a cover and an insulation structure. The top plate of the space under the track is the bottom plate of the single-track tunnel; A manhole is provided above the deep-buried ditch within the space under the rail, and the manhole is equipped with a manhole cover.

2. The single-line tunnel deep-buried water ditch inspection well structure according to claim 1, wherein, The shaft opening is equipped with an upper cover and a lower cover; The thermal insulation structure is disposed between the upper manhole cover and the lower manhole cover.

3. The single wire tunnel deep buried water trench inspection well structure according to claim 1, wherein, Ladders are installed on the side walls of the shaft.

4. The single wire tunnel deep buried water trench inspection well structure according to claim 1, wherein, The top plate of the space under the track is symmetrical about the centerline of the single-track tunnel.

5. The single-line tunnel deep-buried water ditch inspection well structure according to claim 4, wherein, The top plate of the space under the track includes side blocks and middle blocks; The edge block is equipped with a steel bar connector for connecting to the arch wall lining of the single-track tunnel.

6. The single wire tunnel deep buried water trench inspection well structure according to claim 5, wherein, In the section of the single-track tunnel where no deep-buried water ditch is provided, a drainage outlet is also provided on the side block, and the drainage outlet is connected to the deep-buried water ditch through an insulated drainage pipe.

7. The single-line tunnel deep-buried drainage ditch inspection well structure according to claim 1, wherein, The space under the track uses concrete of the same grade as the secondary lining of the single-track tunnel, and the lining thickness of the chamber is determined according to the surrounding rock grade of the single-track tunnel.

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