Intersecting tunnel combined construction structure and construction method thereof

Abstract

The present invention is applicable to the field of municipal engineering technology, and provides an intersecting tunnel combined construction structure and a construction method thereof. The intersecting tunnel combined construction structure has an upper tunnel, a lower tunnel and a single-hole double-layer combined construction section structure. The upper tunnel and the lower tunnel are cross-intersected in the plane, and the combined construction section structure is located at the intersection of the upper tunnel and the lower tunnel. The combined construction section structure is separated by a middle plate in the middle position in the vertical direction, and the space above the middle plate is for the passage of vehicles in the upper tunnel; the space below the middle plate is for the passage of vehicles in the lower tunnel. Through this structure, the vertical height difference between the upper tunnel and the lower tunnel can be compressed to the extreme, and the road line shape is optimized. At the same time, the construction method proposed by the present invention can start construction from any heading that arrives at the intersection node first, avoiding the problem of idle work caused by different construction progress of the upper tunnel and the lower tunnel, effectively shortening the construction period, with strong feasibility and low cost, and worthy of large-scale promotion.

Description

Technical Field

[0001] The invention belongs to the technical field of municipal engineering, and in particular relates to an intersecting tunnel combined construction structure and a construction method thereof. Background Art

[0002] With the rapid rise of urban underground roads, underground interchanges are becoming more and more common. Underground interchanges are generally equipped with multiple ramps, and there is inevitably an up-and-down crossing relationship between the ramp and the main line or between ramps. Tunnels that cross up and down are generally constructed separately. During construction, the lower tunnel is usually constructed first, and then the upper tunnel. The clear distance between the upper and lower tunnels is generally not less than 4m. The larger the tunnel span, the larger the clear distance, so as to reduce the impact of the upper tunnel constructed later on the lower tunnel constructed first, and ensure the safety of the tunnel during construction. However, this approach will have the following problems: the lower tunnel must be constructed first. If the upper tunnel has been constructed to the intersection node, but the lower tunnel has not been completed, the upper tunnel needs to be stopped and resumed after the lower tunnel is completed at that node; at the same time, the height difference between the upper and lower tunnels is large, which often leads to poor tunnel line shape. Therefore, it is of great significance to optimize the structural type of underground intersecting tunnels and propose appropriate construction methods. Summary of the invention

[0003] An object of the present invention is to provide a structure for the combined construction of intersecting tunnels, by which the vertical height difference between the upper and lower tunnels can be compressed to the extreme, thereby optimizing the road line shape; another object of the present invention is to propose a construction method for the combined construction structure of intersecting tunnels, by which the problem of idle work caused by different construction progress of the upper and lower tunnels can be avoided.

[0004] The present invention is implemented as follows: an intersecting tunnel combined structure includes an upper tunnel, a lower tunnel and a combined section structure; the upper tunnel and the lower tunnel are cross-intersected in a plane, the combined section structure is located at the intersection of the upper tunnel and the lower tunnel, the combined section structure is a single-hole double-layer structure, which is separated by a middle plate in the middle position in the vertical direction, the space above the middle plate is the upper tunnel for vehicles in the upper tunnel to pass through; the space below the middle plate is the lower tunnel for vehicles in the lower tunnel to pass through.

[0005] Furthermore, the upper tunnel and the lower tunnel are provided with reinforced sections within a range close to the combined section structure. The reinforced section of the upper tunnel, the reinforced section of the lower tunnel and the combined section structure are composed of initial support, a waterproof layer and a secondary lining. The initial support adopts system anchor rods, shotcrete and steel arch frames, and the secondary lining adopts a reinforced concrete structure.

[0006] Furthermore, a force conversion structure is provided at the connection position between the reinforced section of the lower tunnel and the combined section structure, and the force conversion structure includes a primary support force conversion beam arranged in the initial support and a secondary lining force conversion beam arranged in the secondary lining.

[0007] Furthermore, the initially supported load-bearing transfer beam adopts a steel-wrapped sprayed concrete structure, and locking foot steel pipes are arranged at a certain interval on the outside of the initially supported load-bearing transfer beam. One end of the locking foot steel pipe is located in the surrounding rock, and the other end is welded to the steel section in the initially supported load-bearing transfer beam. The foot of the steel arch frame in the initial support of the upper arch structure of the combined section structure is welded to the initially supported load-bearing transfer beam.

[0008] Furthermore, the secondary lining stress transfer beam adopts a reinforced concrete structure, one side of the secondary lining stress transfer beam is connected to the secondary lining of the lower tunnel, and the upper part of the secondary lining stress transfer beam is connected to the secondary lining of the upper arch structure of the combined section structure.

[0009] Furthermore, the cross-sectional shape of the arch portion of the combined section structure is consistent with the cross-sectional shape of the upper tunnel, and the area of ​​the combined section structure below the arch portion adopts a straight wall structure.

[0010] Furthermore, a deformation joint is arranged on the lower tunnel near the outer side of the combined section structure, and the deformation joint is at a distance from the combined section structure.

[0011] Furthermore, a ditch connecting pipe connecting the ditches on both sides of the upper tunnel is arranged in the middle plate of the combined section structure along the longitudinal direction of the upper tunnel.

[0012] In order to achieve the above-mentioned purpose of the invention, the present invention also provides a construction method for the above-mentioned intersecting tunnel combined structure, and the method has the following two schemes according to different construction working surfaces.

[0013] 1. When the lower tunnel face is used as the construction working face, the construction method includes the following steps:

[0014] S1. Construct the lower tunnel to the interface with the combined section structure;

[0015] S2: Excavation of upper steps in the lower tunnel area of ​​the combined construction section and simultaneous implementation of its initial support;

[0016] S3, step up from the lower tunnel area of ​​the combined section structure to expand upward, complete the excavation of the arched cavern in the upper part of the combined section structure, and simultaneously implement its initial support and initial support load transfer beam;

[0017] S4. Excavate the upper tunnels for a distance from the upper cavern of the combined construction section to both sides, carry out initial support simultaneously, and close the heading face;

[0018] S5. Excavate the lower step of the lower tunnel area of ​​the combined construction section and simultaneously implement its initial support;

[0019] S6: The lower tunnel continues to be excavated and its initial support is carried out simultaneously;

[0020] S7. Lay the waterproof layer in the excavated area, and sequentially construct the secondary lining of the lower tunnel in the excavated area, the secondary lining of the lower structure of the combined section structure, the secondary lining load transfer beam of the combined section structure, the secondary lining of the upper arch structure of the combined section structure, the secondary lining of the upper tunnel and the middle plate of the combined section structure to complete the civil construction of the intersection nodes of the intersecting tunnels.

[0021] 2. The upper tunnel face is the construction working face, and the construction method includes the following steps:

[0022] S1. Construct the upper tunnel to a distance beyond the combined construction section structure, and simultaneously carry out the initial support of the upper tunnel;

[0023] S2. Construct the initial support load transfer beam and provide the initial support for the arched cavern in the upper part of the combined construction section structure;

[0024] S3, excavate the lower part of the combined construction section and simultaneously carry out its initial support;

[0025] S4. A temporary trestle is built where the upper tunnel crosses the combined construction section structure as the construction passage for the upper tunnel;

[0026] S5. The upper tunnel continues to be constructed forward, and at the same time, the lower tunnel is excavated from the lower structure of the combined section structure to both sides for a distance, and the initial support is carried out simultaneously, and the heading face is closed;

[0027] S6. Lay the waterproof layer in the excavated area, and sequentially construct the secondary lining of the lower tunnel in the excavated area, the secondary lining of the lower structure of the combined section structure, the secondary lining load transfer beam of the combined section structure, the secondary lining of the upper arch structure of the combined section structure, the secondary lining of the upper tunnel and the middle plate of the combined section structure to complete the civil construction of the intersection nodes of the intersecting tunnels.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The intersecting tunnel combined structure of the present invention has a combined section structure of a single-hole double-layer structure, wherein the upper tunnel and the lower tunnel are cross-intersected in the plane, and the combined section structure is located at the intersection of the upper tunnel and the lower tunnel. The combined section structure is separated by a middle plate in the middle position in the vertical direction, and the space above the middle plate is the upper tunnel for vehicles in the upper tunnel to pass through; the space below the middle plate is the lower tunnel for vehicles in the lower tunnel to pass through. Through this structure, the vertical height difference between the upper tunnel and the lower tunnel can be compressed to the extreme, thereby optimizing the road line shape. At the same time, the present invention proposes a construction method for the intersecting tunnel combined structure, through which construction can be started from any heading that arrives at the intersection node first, thereby avoiding the problem of idle work caused by different construction progress of the upper tunnel and the lower tunnel, effectively shortening the construction period, having strong feasibility and low cost, and being worthy of large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of a planar structure of an intersecting tunnel combined construction structure provided by an embodiment of the present invention;

[0031] Figure 2 is along Figure 1 The schematic cross-sectional view of section 1-1 is shown;

[0032] Figure 3 is along Figure 1 A schematic cross-sectional view of section 2-2 is shown;

[0033] Figure 4 is along Figure 1 A schematic cross-sectional view of section 3-3 is shown;

[0034] Figure 5 is along Figure 1 A schematic cross-sectional view of section 4-4 is shown. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be a connection between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] See also Figures 1 to 5 , shows a preferred embodiment provided by the present invention, an intersecting tunnel combined structure, comprising an upper tunnel 1, a lower tunnel 2 and a combined section structure 3 of a single-hole double-layer structure. The upper tunnel 1 and the lower tunnel 2 are cross-intersected in the plane, and the combined section structure 3 is located at the intersection of the upper tunnel 1 and the lower tunnel 2. The combined section structure 3 is separated by a middle plate 4 in the middle position in the vertical direction, and the space above the middle plate 4 is the upper tunnel 1 for vehicles in the upper tunnel 1 to pass; the space below the middle plate 4 is the lower tunnel 2 for vehicles in the lower tunnel 2 to pass.

[0038] Specifically, the upper tunnel 1 and the lower tunnel 2 are respectively provided with a reinforcement section 1a and a reinforcement section 2a within a range of 10m close to the combined section structure 3. The reinforcement section 1a of the upper tunnel 1 is composed of the initial support 5a, the waterproof layer 6a and the secondary lining 7a, the reinforcement section 2a of the lower tunnel 2 is composed of the initial support 5b, the waterproof layer 6b and the secondary lining 7b, and the combined section structure 3 is composed of the initial support 5c, the waterproof layer 6c and the secondary lining 7c. The initial support 5a, the initial support 5b and the initial support 5c all adopt system anchor rods, shotcrete and steel arch frames, and the secondary lining 7a, the secondary lining 7b and the secondary lining 7c all adopt reinforced concrete structures.

[0039] The reinforced section 2a of the lower tunnel 2 is provided with a force conversion structure at the connection position with the combined section structure 3, and the force conversion structure includes a primary support force conversion beam 5d arranged in the initial support 5c and a secondary lining force conversion beam 7d arranged in the secondary lining 7c.

[0040] The primary support load transfer beam 5d adopts a steel-wrapped sprayed concrete structure. The outer side of the primary support load transfer beam 5a is provided with a locking foot steel pipe 8 at a certain interval. One end of the locking foot steel pipe 8 is located in the surrounding rock, and the other end is welded to the steel in the primary support load transfer beam 5d. The foot of the steel arch frame in the initial support 5c of the upper arch structure of the combined section structure 3 is welded to the primary support load transfer beam 5d. The secondary lining load transfer beam 7d adopts a reinforced concrete structure. One side of the secondary lining load transfer beam 7d is connected to the secondary lining 7b of the lower tunnel 2, and the upper side of the secondary lining load transfer beam 7d is connected to the secondary lining 7c of the upper arch structure of the combined section structure 3.

[0041] The cross-sectional shape of the arch of the combined section structure 3 is consistent with the cross-sectional shape of the upper tunnel 2, and the area below the arch of the combined section structure 3 adopts a straight wall structure.

[0042] The lower tunnel 2 is provided with a deformation joint 9 on the outer side close to the combined section structure 3, and the deformation joint 9 is 2 to 10 m away from the combined section 3 structure.

[0043] A ditch connecting pipe 10 connecting the ditch on both sides of the upper tunnel 1 is arranged in the middle plate 4 of the combined section structure 3 along the longitudinal direction of the upper tunnel 1 .

[0044] The intersecting tunnel combined structure of this embodiment has a combined section structure 3 of a single-hole double-layer structure, wherein the upper tunnel 1 and the lower tunnel 2 are cross-intersected in the plane, and the combined section structure 3 is located at the intersection of the upper tunnel 1 and the lower tunnel 2. The combined section structure 3 is separated by a middle plate 4 in the middle position in the vertical direction, and the space above the middle plate 4 is the upper tunnel 1 for vehicles in the upper tunnel 1 to pass; the space below the middle plate 4 is the lower tunnel 2 for vehicles in the lower tunnel 2 to pass. Through this structure, the vertical height difference between the upper tunnel 1 and the lower tunnel 2 can be compressed to the extreme, optimizing the road line shape.

[0045] This embodiment also provides a construction method for the above-mentioned intersecting tunnel combined structure. According to different construction working faces, the construction method of this embodiment has two schemes, which are described in detail below with the lower tunnel 2 heading face as the construction working face and the upper tunnel 1 heading face as the construction working face.

[0046] 1. When the lower tunnel 2 face is used as the construction working face, the construction method of this embodiment includes the following steps:

[0047] S1, construct the lower tunnel 2 to the interface with the combined section structure 3;

[0048] S2, the lower tunnel area of ​​the combined construction section structure 3 is excavated on the upper steps and its initial support 5c is simultaneously implemented;

[0049] S3, step up from the lower tunnel area of ​​the combined section structure 3 to expand upward, complete the excavation of the upper arch cavern of the combined section structure 3, and simultaneously implement its initial support 5c and initial support load transfer beam 5d;

[0050] S4, excavate the upper tunnel 1 from the upper cavern of the combined construction section structure 3 to both sides for 5 to 10 m, simultaneously carry out its initial support 5a, and close the heading face;

[0051] S5, excavate the lower step of the lower tunnel area of ​​the combined construction section structure 3 and simultaneously implement its initial support 5c;

[0052] S6. The lower tunnel 2 continues to be excavated forward, and its initial support 5b is implemented simultaneously;

[0053] S7. Lay waterproof layer 6a, waterproof layer 6b and waterproof layer 6c in the excavated area, and successively construct secondary lining 7b of lower tunnel 2 in the excavated area, secondary lining of lower structure of combined section structure 3, secondary lining force transfer beam 7d of combined section structure 3, secondary lining 7c of upper arch structure of combined section structure 3, secondary lining 7a of upper tunnel 1 and middle plate 4 of combined section structure 3 to complete the civil construction of intersection nodes of intersecting tunnels.

[0054] 2. With the upper tunnel 1 face as the construction working face, the construction method of this embodiment includes the following steps:

[0055] S1, construct the upper tunnel 1 to 5-10m beyond the combined construction section structure 3, and simultaneously carry out its initial support 5a;

[0056] S2, construct the initial support load transfer beam 5d, and carry out the initial support 5c of the upper arch cavern of the combined construction section structure 3;

[0057] S3, excavate the lower part of the combined construction section structure 3 downwards, and simultaneously implement its initial support 5e;

[0058] S4. A temporary trestle is set up at the place where the upper tunnel 1 crosses the combined construction section structure 3 as a construction passage for the upper tunnel 1;

[0059] S5, the upper tunnel 1 continues to be constructed forward, and at the same time, the lower tunnel 2 is excavated from the lower structure of the combined section structure 3 to both sides for 5 to 10 m, and the initial support 5b is implemented simultaneously, and the heading face is closed;

[0060] S6. Lay waterproof layer 6a, waterproof layer 6b and waterproof layer 6c in the excavated area, and successively construct secondary lining 7b of lower tunnel 2 in the excavated area, secondary lining of lower structure of combined section structure 3, secondary lining load transfer beam 7d of combined section structure 3, secondary lining 7c of upper arch structure of combined section structure 3, secondary lining 7a of upper tunnel 1 and middle plate 4 of combined section structure 3 to complete civil construction of intersection nodes of intersecting tunnels.

[0061] It can be seen that through the construction method of this embodiment, construction can be started from any heading that arrives at the intersection node first, avoiding the problem of idle work caused by different construction progress of the upper tunnel 1 and the lower tunnel 2. It is highly feasible and low in cost, and is worthy of large-scale promotion.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction method for an intersecting tunnel combined structure, the intersecting tunnel combined structure comprising an upper tunnel, a lower tunnel and a combined section structure; the upper tunnel and the lower tunnel are cross-intersected in a plane, the combined section structure is located at the intersection of the upper tunnel and the lower tunnel, the combined section structure is a single-hole double-layer structure, and a middle plate is used to separate the space above the middle plate in the middle position in the vertical direction as the upper tunnel for vehicles in the upper tunnel to pass; the space below the middle plate is the lower tunnel for vehicles in the lower tunnel to pass; the upper tunnel and the lower tunnel are separated in a vertical direction by a middle plate; the space above the middle plate is ... lower tunnel for vehicles in the lower tunnel; the space below the middle plate is the lower tunnel for vehicles in the lower tunnel; the space below the middle plate is the lower tunnel for vehicles in the lower tunnel; the space below the middle plate is the lower tunnel; the space below the middle plate is the lower tunnel; the space below the middle plate is the lower tunnel; the space below the middle plate is the lower tunnel; the space below the middle plate is the lower tunnel; the space below the middle plate is the lower tunnel; the space below the middle plate is the lower tunnel; the space below the middle plate is the lower tunnel; the space below the middle plate is the lower tunnel; the space below the middle plate is the lower tunnel; the space below the middle plate is A reinforcement section is arranged within a range close to the combined section structure. The reinforcement section of the upper tunnel, the reinforcement section of the lower tunnel and the combined section structure are composed of an initial support, a waterproof layer and a secondary lining. The initial support adopts a system anchor rod, shotcrete and a steel arch frame, and the secondary lining adopts a reinforced concrete structure. The reinforcement section of the lower tunnel is provided with a force conversion structure at the connection position with the combined section structure. The force conversion structure includes an initial support force conversion beam arranged in the initial support and a secondary lining force conversion beam arranged in the secondary lining. It is characterized in that Taking the lower tunnel face as the construction working face, the construction method comprises the following steps: S1. Construct the lower tunnel to the interface with the combined section structure; S2: Excavation of upper steps in the lower tunnel area of ​​the combined construction section and simultaneous implementation of its initial support; S3, step up from the lower tunnel area of ​​the combined section structure to expand upward, complete the excavation of the arched cavern in the upper part of the combined section structure, and simultaneously implement its initial support and initial support load transfer beam; S4. Excavate the upper tunnels for a certain distance from the upper cavern of the combined construction section to both sides, and simultaneously carry out the initial support and close the heading face; S5. Excavate the lower step of the lower tunnel area of ​​the combined construction section and simultaneously implement its initial support; S6: The lower tunnel continues to be excavated and its initial support is carried out simultaneously; S7. Lay the waterproof layer in the excavated area, and sequentially construct the secondary lining of the lower tunnel in the excavated area, the secondary lining of the lower structure of the combined section structure, the secondary lining load transfer beam of the combined section structure, the secondary lining of the upper arch structure of the combined section structure, the secondary lining of the upper tunnel and the middle plate of the combined section structure to complete the civil construction of the intersection nodes of the intersecting tunnels.

2. A construction method for an intersecting tunnel combined structure, the intersecting tunnel combined structure comprising an upper tunnel, a lower tunnel and a combined section structure; the upper tunnel and the lower tunnel are cross-intersected in a plane, the combined section structure is located at the intersection of the upper tunnel and the lower tunnel, the combined section structure is a single-hole double-layer structure, and a middle plate is used to separate the space above the middle plate in the middle position in the vertical direction as the upper tunnel for vehicles in the upper tunnel to pass; the space below the middle plate is the lower tunnel for vehicles in the lower tunnel to pass; the upper tunnel and the lower tunnel are separated in a vertical direction by a middle plate. A reinforcement section is arranged within a range close to the combined section structure. The reinforcement section of the upper tunnel, the reinforcement section of the lower tunnel and the combined section structure are composed of an initial support, a waterproof layer and a secondary lining. The initial support adopts a system anchor rod, shotcrete and a steel arch frame, and the secondary lining adopts a reinforced concrete structure. The reinforcement section of the lower tunnel is provided with a force conversion structure at the connection position with the combined section structure. The force conversion structure includes an initial support force conversion beam arranged in the initial support and a secondary lining force conversion beam arranged in the secondary lining. It is characterized in that The upper tunnel face is the construction working face, and the construction method comprises the following steps: S1. Construct the upper tunnel to a distance beyond the combined construction section structure, and simultaneously carry out the initial support of the upper tunnel; S2, construct the initial support load transfer beam and provide the initial support for the upper arch cavern of the combined section structure; S3, excavate the lower part of the combined section structure downwards and provide its initial support simultaneously; S4. A temporary trestle is built where the upper tunnel crosses the combined construction section structure as the construction passage for the upper tunnel; S5. The upper tunnel continues to be constructed forward, and at the same time, the lower tunnel is excavated from the lower structure of the combined section structure to both sides for a distance, and the initial support is carried out simultaneously, and the heading face is closed; S6. Lay the waterproof layer in the excavated area, and sequentially construct the secondary lining of the lower tunnel in the excavated area, the secondary lining of the lower structure of the combined section structure, the secondary lining load transfer beam of the combined section structure, the secondary lining of the upper arch structure of the combined section structure, the secondary lining of the upper tunnel and the middle plate of the combined section structure to complete the civil construction of the intersection nodes of the intersecting tunnels.

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