A leakage water tunnel implemented in a double-line mountain tunnel inner inclined shaft and a construction method thereof

Abstract

The application discloses a kind of seepage water tunnel and its construction method of double-line mountain tunnel inner inclined shaft implementation, belong to the technical field of tunnel construction.The application solves the technical problem that seepage water tunnel is implemented through vertical shaft, and the operation conditions such as feeding, slagging, ventilation construction are limited, the feeding and slagging of seepage water tunnel are constructed by arranging inclined shaft section in the horizontal passage between the first tunnel and the second tunnel, the construction of seepage water tunnel is completed, the difficulty of construction is low, the operability is strong, the problem of insufficient construction conditions limited by underground space when tunnel aggregate, slagging, exhaust construction is solved by using ground vertical shaft;The construction method of the application is constructed by arranging inclined shaft section, has the advantages of high implementability, low construction difficulty, short construction period, and can be widely applied.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of tunnel construction, and particularly relates to a leakage water tunnel implemented by an inclined shaft in a double-line mountain tunnel and a construction method thereof. BACKGROUND

[0002] With the development of urban underground traffic, underground leakage water tunnels built in the form of tunnels are gradually increasing, and the material transportation and slag discharge of underground leakage water tunnels are the key points of design and construction, which controls the entire underground tunnel construction. The underground leakage water tunnel is generally composed of an underground shaft construction section and a leakage water tunnel excavation section. The conventional construction direction is from the underground shaft to the underground leakage water tunnel section, for example, CN111005761A discloses a water collecting and draining structure of a mine method tunnel and a construction method thereof. A horizontal passage is arranged between the lowest points of the two main line tunnels, and a water collecting tunnel is arranged below the pump house of the horizontal passage. The horizontal passage is expanded downward to the bottom of the water collecting tunnel in the form of a vertical shaft. However, due to the insufficient underground space environment and the insufficient construction operation conditions of large lifting mechanical equipment, it is difficult to have the construction conditions from the underground shaft to the underground leakage water tunnel section. SUMMARY

[0003] In view of the deficiencies of the prior art, the present application aims to provide a leakage water tunnel implemented by an inclined shaft in a double-line mountain tunnel, which is used to complete the construction of the leakage water tunnel by arranging an inclined shaft section from a horizontal passage when the vertical shaft construction conditions are not available. Another object of the present application is to provide a construction method of the leakage water tunnel implemented by an inclined shaft in a double-line mountain tunnel.

[0004] To achieve the above objects, the present application adopts the following technical solution: a leakage water tunnel implemented by an inclined shaft in a double-line mountain tunnel, comprising an inclined shaft section for implementing the leakage water tunnel; the double-line mountain tunnel comprises a first tunnel and a second tunnel, further comprises a drainage pump house and a horizontal passage arranged between the first tunnel and the second tunnel, and connected with the first tunnel and the second tunnel; the leakage water tunnel is arranged between the drainage pump house and the horizontal passage.

[0005] Further, the leakage water tunnel comprises an inclined shaft utilization section, a standard section and a vertical shaft section. The upper end of the inclined shaft section is connected with the middle of the horizontal passage, the lower end of the inclined shaft section is connected with the upper end of the inclined shaft utilization section, the standard section is connected with the inclined shaft utilization section, and the vertical shaft section is connected with the standard section and located below the drainage pump house.

[0006] Further, the cross-sectional shape of the inclined shaft utilization section during temporary construction is consistent with that of the inclined shaft section, and the cross-sectional shape of the permanent state is consistent with that of the standard section.

[0007] Further, the top elevation of the standard section is lower than the bottom elevation of the double-line mountain tunnel.

[0008] Furthermore, the bottom elevation of the vertical shaft section is lower than the bottom elevation of the standard section.

[0009] Furthermore, the water leakage tunnel is located between the first tunnel and the second tunnel, and the water leakage tunnel, the cross passage, and the drainage pump house are arranged in an "I" shape on the plane.

[0010] Furthermore, the inclined shaft section is a temporary inclined shaft used for the construction of the seepage tunnel. During construction, it is supported by initial lining. After the permanent structure of the seepage tunnel is poured, it is backfilled and sealed.

[0011] Furthermore, the permanent cross-sectional shape of the inclined shaft utilization section is formed by reverse excavation of the bottom of the cross-sectional shape during temporary construction, so that the inner contour elevation of the arch is consistent with the standard section, and the super-high area at the top is backfilled.

[0012] Furthermore, the construction method of the seepage tunnel adopts the New Austrian Tunneling Method (NATM), and initial lining is used for support during the temporary construction period; the permanent state of the standard section adopts a closed waterproof structure formed by pouring reinforced concrete secondary lining.

[0013] The construction method for the seepage tunnel implemented in the inclined shaft of the aforementioned double-track mountain tunnel includes the following steps:

[0014] (1) Construction of a dual-track mountain tunnel;

[0015] (2) Construct the cross passage and drainage pump room in the middle of the double-track mountain tunnel and pour reinforced concrete structure;

[0016] (3) Excavate the inclined shaft section from the middle side of the transverse passage. The excavation direction is parallel to the double-line mountain tunnel in the plane and has a certain slope in the vertical direction. It serves as the slag discharge and material and equipment access passage for the tunnel with construction seepage.

[0017] (4) The bottom elevation of the inclined shaft section from the excavation of the inclined shaft section to the utilization section, and the standard construction section;

[0018] (5) A vertical shaft section is constructed below the drainage pumping station, and the vertical shaft section is connected to the standard section;

[0019] (6) The vertical shaft section is connected to the drainage pump room, and the standard section secondary lining structure is poured backward;

[0020] (7) Expand the bottom of the inclined shaft utilization section, pour the secondary lining structure, the inner contour of the secondary lining structure is consistent with the standard section, the top super-high area is backfilled with concrete, and the end is sealed with a concrete wall.

[0021] (8) Backfill the inclined shaft section and pour the secondary lining structure of the transverse passage and the entrance of the inclined shaft section;

[0022] (9) Close the cover plate of the vertical shaft section, install the water pumping pump, and complete the leakage water tunnel construction.

[0023] Compared with the prior art, the application has the following beneficial effects:

[0024] (1) The leakage water tunnel is constructed by arranging the inclined shaft section in the cross passage between the first tunnel and the second tunnel, and the construction is completed in stages from the inclined shaft section and the inclined shaft utilization section to the standard section and the vertical shaft section, so that the construction difficulty of each stage is low and the operability is strong, and the problem of insufficient construction conditions due to the limitation of underground space when using the ground vertical shaft to collect materials, discharge slag and exhaust air in the tunnel is solved.

[0025] (2) The cross-sectional shape of the inclined shaft utilization section during temporary construction is consistent with that of the inclined shaft section, and the inclined shaft utilization section plays the same role as the inclined shaft section during temporary construction, which is convenient for construction; the permanent state of the reverse expansion of the inclined shaft utilization section plays the same role as the standard section, and together with the standard section, it forms the main structure of the leakage water tunnel, increases the storage of the surrounding rock leakage water of the double-line mountain tunnel, and the application fully plays the role of the inclined shaft utilization section, which can effectively reduce the excavation engineering quantity and the backfill quantity, and achieve the effect of saving and increasing efficiency.

[0026] (3) The construction method of the leakage water tunnel implemented by the inclined shaft in the double-line mountain tunnel can be widely applied when the collection and discharge of materials in the underground tunnel are limited by the underground vertical shaft, and the construction difficulty is low, the construction period is short, and the construction can be implemented with high applicability. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a plan layout of the leakage water tunnel implemented by the inclined shaft in the double-line mountain tunnel;

[0028] Figure 2 It is a longitudinal section layout of the leakage water tunnel implemented by the inclined shaft in the double-line mountain tunnel;

[0029] Figure 3 It is a cross-sectional schematic diagram of the inclined shaft section;

[0030] Figure 4 It is a cross-sectional schematic diagram of the standard section;

[0031] Among them, 1 is the leakage water tunnel, 11 is the inclined shaft section, 12 is the inclined shaft utilization section, 13 is the standard section, 14 is the vertical shaft section, 2 is the cross passage, 3 is the drainage pump house, 41 is the first tunnel, 42 is the second tunnel, 11a is the anchor rod, 11b is the steel frame sprayed concrete, 12a is the top super-high area, 12b is the concrete wall, 13a is the anchor rod support, 13b is the secondary reinforced concrete lining, and 13c is the grouting hole. DETAILED DESCRIPTION

[0032] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0033] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application; the terms "first", "second", "third" are only for description purposes, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium, or the communication between the interiors of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] Please refer to Figure 1 , which shows a leakage water tunnel implemented in a double-line mountain tunnel inclined shaft, the double-line mountain tunnel includes a first tunnel 41 and a second tunnel 42, further includes a drainage pump house 3 and a cross passage 2 arranged between the first tunnel 41 and the second tunnel 42, and communicating the first tunnel 41 and the second tunnel 42; the leakage water tunnel 1 is arranged in a plane between the drainage pump house 3 and the cross passage 2. The drainage pump house 3 collects the tunnel surrounding rock leakage water of the whole line of the double-line mountain tunnel to the lowest point of the tunnel, injects into the leakage water tunnel 1 for storage, and after reaching a certain capacity, is pumped out to the municipal pipe network outside the tunnel through the drainage pump house 3.

[0035] Please refer to Figure 2 , the leakage water tunnel 1 includes an inclined shaft section 11, an inclined shaft utilization section 12, a standard section 13, and a vertical shaft section 14, the upper end of the inclined shaft section 11 is connected to the middle of the cross passage 2, the lower end of the inclined shaft section 11 is connected to the upper end of the inclined shaft utilization section 12, the standard section 13 is connected to the inclined shaft utilization section 12, the vertical shaft section 14 is connected to the standard section 13, and is located below the drainage pump house 3.

[0036] Please refer to Figure 2The slope of the inclined shaft section 11 should meet the requirements for earthmoving vehicles. In this embodiment, the slope should not exceed 10%. The length of the inclined shaft section 11 can vary depending on the location of the cross passage, which is related to whether the cross passage is used as a vehicle passage or a pedestrian passage. The design should be considered in conjunction with the construction of the seepage tunnel as much as possible. The cross-sectional shape and size of the inclined shaft section 11 should meet the operating space of the loading vehicles to facilitate the transportation of construction equipment and earthmoving vehicles.

[0037] Please see Figure 2 The cross-sectional shape of the inclined shaft utilization section 12 during temporary construction is the same as that of the inclined shaft section 11, and the cross-sectional shape in the permanent state is the same as that of the standard section 13. That is, the inclined shaft utilization section 12 plays the same role as the inclined shaft section during temporary construction, and together with the standard section 13 during permanent use, it forms the main structure of the seepage tunnel 1, which is used to store the seepage water of the surrounding rock of the double-track mountain tunnel.

[0038] Please see Figure 2 The length and cross-sectional dimensions of standard section 13 are calculated based on the amount of seepage water collected from the surrounding rock of the double-track mountain tunnel, and it is required to ensure that at least one day's amount of seepage water can be stored. The top elevation of standard section 13 is lower than the bottom elevation of the double-track mountain tunnel to prevent seepage water in standard section 13 from overflowing into the interior of the double-track mountain tunnel and causing traffic and personal accidents.

[0039] Please see Figure 2 The bottom elevation of vertical shaft section 14 is lower than that of standard section 13. Under operational conditions, a water pump is installed at the bottom of vertical shaft section 14 to discharge the seepage water in seepage tunnel 1 into the municipal pipe network outside the tunnel through drainage pipes.

[0040] Please see Figure 1 The water leakage tunnel 1 is located between the first tunnel 41 and the second tunnel 42. The water leakage tunnel 1, the cross passage 2, and the drainage pump house 3 are arranged in an "I" shape in plan view. The intersection angle can be adjusted according to the structural layout, and should be as far away as possible from the first tunnel 41 and the second tunnel 42 to reduce the impact on the double-track mountain tunnel during construction.

[0041] Please see Figure 2 and Figure 3 Inclined shaft section 11 is a temporary inclined shaft used for the construction of the seepage tunnel 1. During construction, it is supported by initial lining. After the permanent structure of the seepage tunnel 1 is poured, it will be backfilled with stone powder and cement grouting for sealing. The cross-sectional dimensions of inclined shaft section 11 should meet the operating space of loading vehicles. The initial lining includes anchor bolts 11a and steel frame shotcrete 11b. Its strength should be appropriately increased according to the surrounding rock conditions to ensure safety and stability during long-term construction.

[0042] Please see Figure 2, the section shape of the inclined shaft utilization section 12 during the temporary construction period is consistent with the inclined shaft section 11, and the section shape of the permanent state is formed by performing reverse excavation on the bottom of the section shape during the temporary construction period, making the inner contour elevation of the arch consistent with the standard section 13, and backfilling the top overheight area 12a. The top overheight area 12a can be backfilled with fine stone concrete or cement grouting. The end of the connection between the inclined shaft utilization section 12 and the inclined shaft section 11 is permanently sealed by pouring a concrete wall 12b. The permanent state of the inclined shaft utilization section 12 has the same effect as the standard section 13, which can effectively reduce the excavation engineering quantity and backfill quantity, and achieve the effect of saving and increasing efficiency.

[0043] Please refer to Figure 4 , the construction method of the leakage water tunnel 1 is implemented by the new Austrian method, and the initial lining is used for support during the temporary construction period. Because the section is not large, the up-and-down step method or the full-face excavation method can be used for construction. The permanent state of the standard section 13 is formed by pouring the secondary reinforced concrete lining 13b to form a closed structure, and the outer package waterproof material is used as the waterproof measure. The anchor rod support 13a should be arranged on the outside of the arch top according to the surrounding rock condition, and the grouting hole 13c should be reserved on the secondary reinforced concrete lining 13b of the arch top, and the grouting sealing is performed for the leakage and soil hole condition in the later period.

Claims

1. A seepage tunnel constructed using an inclined shaft within a double-track mountain tunnel, characterized in that, The system includes an inclined shaft section for implementing a seepage tunnel; the twin-track mountain tunnel includes a first tunnel and a second tunnel, and also includes a drainage pump house and a cross passage arranged between the first tunnel and the second tunnel, and connecting the first tunnel and the second tunnel; the seepage tunnel is arranged in plan between the drainage pump house and the cross passage. The seepage tunnel includes an inclined shaft utilization section, a standard section, and a vertical shaft section. The upper end of the inclined shaft section is connected to the middle of the horizontal passage, the lower end of the inclined shaft section is connected to the upper end of the inclined shaft utilization section, the standard section is connected to the inclined shaft utilization section, and the vertical shaft section is connected to the standard section. It is located below the drainage pumping station. The cross-sectional shape of the inclined shaft utilization section during temporary construction is consistent with that of the inclined shaft section, and the cross-sectional shape in the permanent state is consistent with that of the standard section. The top elevation of the standard section is lower than the bottom elevation of the double-track mountain tunnel; The bottom elevation of the vertical shaft section is lower than the bottom elevation of the standard section; The water leakage tunnel is located between the first tunnel and the second tunnel, and the water leakage tunnel, the cross passage and the drainage pump house are arranged in an "I" shape in the plane. The inclined shaft section is a temporary inclined shaft used for the construction of the seepage tunnel. During construction, it is supported by initial lining. After the permanent structure of the seepage tunnel is poured, it is backfilled and sealed. The permanent cross-sectional shape of the inclined shaft utilization section is formed by reverse excavation of the bottom of the cross-sectional shape during temporary construction, so that the inner contour elevation of the arch is consistent with the standard section, and the super-high area at the top is backfilled.

2. The seepage tunnel implemented with an inclined shaft inside a double-track mountain tunnel according to claim 1, characterized in that, The construction method for the water-seeping tunnel adopts the New Austrian Tunneling Method (NATM), and initial lining is used for support during the temporary construction period; the permanent state of the standard section adopts a closed waterproof structure formed by pouring reinforced concrete secondary lining.

3. A construction method for a water-leaking tunnel implemented in an inclined shaft within a double-track mountain tunnel as described in any one of claims 1 to 2, characterized in that, Includes the following steps: (1) Construction of a double-track mountain tunnel; (2) Construct the cross passage and drainage pump room in the middle of the double-track mountain tunnel, and pour reinforced concrete structure; (3) Excavate the inclined shaft section from the middle side of the transverse passage. The excavation direction is parallel to the double-line mountain tunnel in the plane and is a slope in the vertical direction. It serves as the slag discharge and material and equipment access passage for the tunnel with construction seepage. (4) The bottom elevation of the inclined shaft section from the excavation of the inclined shaft section to the utilization section, and the standard construction section; (5) A vertical shaft section is constructed below the drainage pumping station, and the vertical shaft section is connected to the standard section; (6) The vertical shaft section is connected to the drainage pump room, and the standard section secondary lining structure is poured backward; (7) The bottom of the extended inclined shaft utilization section is enlarged and a secondary lining structure is poured. The inner contour of the secondary lining structure is consistent with that of the standard section. The super-high area at the top is backfilled with concrete, and the end is sealed with a concrete wall. (8) Backfill the inclined shaft section and pour the secondary lining structure of the transverse passage and the entrance of the inclined shaft section; (9) Seal the cover plate of the vertical shaft section, install a water pump, and complete the construction of the seepage tunnel.

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