Conversion structure between double-layer TBM tunnel and single-layer TBM tunnel and its construction method

Abstract

The present invention is applicable to the field of tunnel technology, and provides a conversion structure between a double-layer TBM tunnel and a single-layer TBM tunnel and a construction method thereof. The dark excavation conversion structure of the present invention includes a single-hole double-layer large-diameter TBM tunnel, a dark excavation conversion tunnel, and a double-hole single-layer small-diameter TBM tunnel. The dark excavation conversion tunnel is located between the large-diameter TBM tunnel and the small-diameter TBM tunnel. The dark excavation conversion structure of the present invention solves the conversion problem between a single-hole double-layer large-diameter TBM tunnel and a double-hole single-layer small-diameter TBM tunnel. During the implementation process, all mechanized dark excavation construction is adopted, which has little impact on the ground surface, low cost, strong feasibility, and is worthy of large-scale promotion.

Description

Technical Field

[0001] The present invention belongs to the technical field of tunnels, and in particular relates to a dark excavation conversion structure between a double-layer TBM tunnel and a single-layer TBM tunnel and a construction method thereof. Background Art

[0002] With the development of cities, my country's tunnels, especially large-diameter TBM tunnels, have developed rapidly in recent years. When the diameter of the TBM is large enough, a single-hole double-layer TBM tunnel will appear. Single-hole double-layer large-diameter TBM tunnels have the advantages of saving land and economical construction, and are a major development direction in the future tunnel field. Due to the complex conditions of urban construction, it is inevitable that single-hole double-layer large-diameter TBM tunnels will be converted to double-hole single-layer small-diameter TBM tunnels.

[0003] Therefore, it is urgent to solve the conversion problem between the two tunnel structure types: double-layer TBM tunnel and single-layer TBM tunnel. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a dark excavation conversion structure between a double-layer TBM tunnel and a single-layer TBM tunnel and a construction method thereof, aiming to solve the conversion problem between the two tunnel structure types of a single-hole double-layer large-diameter TBM tunnel and a double-hole single-layer small-diameter TBM tunnel.

[0005] The present invention is implemented as follows: a dark excavation conversion structure between a double-layer TBM tunnel and a single-layer TBM tunnel includes a single-hole double-layer large-diameter TBM tunnel, a dark excavation conversion tunnel and a double-hole single-layer small-diameter TBM tunnel, wherein the small-diameter TBM tunnel includes a separated upper-layer small-diameter TBM tunnel and a lower-layer small-diameter TBM tunnel; the dark excavation conversion tunnel is located between the large-diameter TBM tunnel and the small-diameter TBM tunnel.

[0006] Furthermore, the large-diameter TBM tunnel, the dark-excavation conversion tunnel and the small-diameter TBM tunnel structure are provided with primary support, a waterproof layer and a secondary lining from the outside to the inside, and the primary support includes system anchor rods, sprayed concrete and a steel mesh and a steel frame wrapped in the sprayed concrete.

[0007] Furthermore, the large-diameter TBM tunnel is provided with a first middle plate, the upper layer tunnel is above the first middle plate, the lower layer tunnel is below the first middle plate, and the longitudinal slope of the upper layer tunnel of the large-diameter TBM tunnel is consistent with the longitudinal slope of the lower layer tunnel.

[0008] Furthermore, the dark-excavation conversion tunnel is a double-layer structure, in which a second middle plate is arranged in the middle, the upper tunnel is above the second middle plate, and the lower tunnel is below the second middle plate. The second middle plate descends within a certain range near one end of the upper small-diameter TBM tunnel and falls below the bottom of the upper small-diameter TBM tunnel to facilitate the exit of the upper small-diameter TBM tunnel.

[0009] Furthermore, the longitudinal slope of the upper tunnel of the dark-excavated conversion tunnel is different from the longitudinal slope of the lower tunnel, and the net height of the lower tunnel structure of the dark-excavated conversion tunnel is a variable value, which is a small value at the end close to the large-diameter TBM tunnel and a large value at the end close to the small-diameter TBM tunnel.

[0010] Furthermore, the excavation section contour line of the dark-cut conversion tunnel consists of three parts: an arch, an invert and two side walls. The arch is an upper semicircle, which is consistent with the outer diameter of the large-diameter TBM tunnel and is formed by the construction of the large-diameter TBM tunnel boring machine; the invert is a lower semicircle, which is consistent with the outer diameter of the lower small-diameter TBM tunnel and is formed by the construction of the lower small-diameter TBM tunnel boring machine; the two side walls are connected by the tangent lines of the upper semicircle and the lower semicircle, and are formed by rock drilling and trimming by mechanical equipment; the center of the arch is vertically arranged with the center of the invert.

[0011] Furthermore, only a single-layer carriageway is arranged in the upper small-diameter TBM tunnel and the lower small-diameter TBM tunnel.

[0012] Furthermore, at the junction of the small-diameter TBM tunnel and the dark-excavation conversion tunnel, the upper small-diameter TBM tunnel and the lower small-diameter TBM tunnel are arranged vertically, and the structural clearance between the two tunnels is not less than 3m.

[0013] Furthermore, the upper small-diameter TBM tunnel and the lower small-diameter TBM tunnel can freely adjust the plane and longitudinal section layout according to needs.

[0014] In order to solve the above technical problems, the present invention also provides a construction method of the above dark excavation conversion structure, comprising the following steps:

[0015] S1. The large-diameter TBM tunnel is excavated to the boundary stake number between the large-diameter TBM tunnel and the dark-cut conversion tunnel, and the primary support, waterproof layer and secondary lining of the excavated area are constructed in sequence;

[0016] S2. The large-diameter TBM continues to excavate along the design line of the upper tunnel until it reaches the boundary stake number between the dark-cut conversion tunnel and the small-diameter TBM tunnel, and sequentially constructs the initial support of the upper semicircle of the excavated area of ​​the dark-cut conversion tunnel and the temporary support measures of the lower semicircle;

[0017] S3, large diameter TBMs are dismantled and transported out through the excavated tunnels;

[0018] S4, transport small-diameter TBM parts from the lower layer through the excavated tunnel and install them;

[0019] S5, the lower layer small diameter TBM tunnel boring machine starts to excavate along the lower layer tunnel design line from the boundary stake number between the large diameter TBM tunnel and the dark excavation conversion tunnel until the boundary stake number between the dark excavation conversion tunnel and the small diameter TBM tunnel;

[0020] S6, the lower small-diameter TBM continues to excavate along the lower tunnel design line, and simultaneously constructs the primary support, waterproof layer and secondary lining of the lower small-diameter TBM tunnel;

[0021] S7, using mechanical rock drilling to remove the remaining surrounding rock of the dark excavation conversion tunnel and the temporary support measures of the lower semicircle constructed during the construction of the large-diameter shield machine to the designed excavation contour line, and constructing the side wall and the initial support of the lower semicircle;

[0022] S8, pouring the second lining and the second middle plate of the dark excavation conversion tunnel and the first middle plate of the large-diameter shield tunnel;

[0023] S9, transporting upper-layer small-diameter TBM components through the excavated tunnel and installing them above the second middle plate of the dark-excavated conversion tunnel;

[0024] S10, the upper small-diameter TBM tunnel boring machine starts to excavate forward from the boundary pile number between the dark-excavated conversion tunnel and the small-diameter TBM tunnel, and simultaneously constructs the primary support, waterproof layer and secondary lining of the upper small-diameter TBM tunnel.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The dark excavation conversion structure of the present invention comprises a single-hole double-layer large-diameter TBM tunnel, a dark excavation conversion tunnel and a double-hole single-layer small-diameter TBM tunnel, and the dark excavation conversion tunnel is located between the large-diameter TBM tunnel and the small-diameter TBM tunnel. The dark excavation conversion structure of the present invention solves the conversion problem between a single-hole double-layer large-diameter TBM tunnel and a double-hole single-layer small-diameter TBM tunnel. During the construction process, all mechanized dark excavation construction is adopted, which has little impact on the ground surface, low cost, strong feasibility, and is worthy of large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic plan view of a dark excavation conversion structure between a single-hole double-layer large-diameter TBM tunnel and a double-hole single-layer small-diameter TBM tunnel provided by an embodiment of the present invention;

[0028] Figure 2 yes Figure 1 The longitudinal section layout diagram of the dark excavation conversion structure is shown;

[0029] Figure 3 yes Figure 1 A schematic cross-sectional view of a single-hole, double-layer, large-diameter TBM tunnel in a dark excavation conversion structure is shown;

[0030] Figure 4 yes Figure 1 A schematic cross-sectional view of a dark excavation conversion tunnel in the dark excavation conversion structure shown;

[0031] Figure 5 yes Figure 1 A schematic cross-sectional view of a dark excavation conversion tunnel in the dark excavation conversion structure shown near a small-diameter TBM tunnel;

[0032] Figure 6 yes Figure 1 Schematic diagram of the cross section of a small diameter TBM tunnel in a dark excavation conversion structure is shown. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] See also Figure 1 and Figure 2, shows a preferred embodiment provided by the present invention, a dark excavation conversion structure between a double-layer TBM tunnel and a single-layer TBM tunnel, comprising a single-hole double-layer large-diameter TBM tunnel 1, a dark excavation conversion tunnel 2, and a double-hole single-layer small-diameter TBM tunnel. The small-diameter TBM tunnel comprises an upper-layer small-diameter TBM tunnel 3 and a lower-layer small-diameter TBM tunnel 4 that are arranged separately; the dark excavation conversion tunnel 2 is located between the large-diameter TBM tunnel 1 and the small-diameter TBM tunnel.

[0036] For details, see Figure 3 The large-diameter TBM tunnel 1 is provided with a first middle plate b1, the upper layer tunnel is located above the first middle plate b1, and the lower layer tunnel is located below the first middle plate b1. The longitudinal slope of the upper layer tunnel of the large-diameter TBM tunnel 1 is consistent with the longitudinal slope of the lower layer tunnel.

[0037] Please see Figure 4 and Figure 5 The dark-excavated conversion tunnel 2 is a double-layer structure, in which a second middle plate b2 is arranged in the middle, the upper tunnel is above the second middle plate b2, and the lower tunnel is below the second middle plate b2. The second middle plate b2 descends within a certain range near one end of the upper small-diameter TBM tunnel 3 and falls below the bottom of the upper small-diameter TBM tunnel 3, so as to facilitate the exit of the upper small-diameter TBM tunnel 3.

[0038] The longitudinal slope of the upper tunnel of the dark-excavated conversion tunnel 2 is different from that of the lower tunnel. The net height of the lower tunnel structure of the dark-excavated conversion tunnel 2 is a variable value, which is a small value at the end close to the large-diameter TBM tunnel 1 and a large value at the end close to the small-diameter TBM tunnel.

[0039] The excavation section contour line of the dark-cut conversion tunnel 2 consists of three parts: an arch, an invert and side walls. The arch is an upper semicircle, which is consistent with the outer diameter of the large-diameter TBM tunnel 1 and is formed by the tunnel boring machine of the large-diameter TBM tunnel 1; the invert is a lower semicircle, which is consistent with the outer diameter of the lower-level small-diameter TBM tunnel 4 and is formed by the tunnel boring machine of the lower-level small-diameter TBM tunnel 4; the side walls on both sides are connected by the tangent lines of the upper semicircle and the lower semicircle, and are formed by rock drilling and trimming by mechanical equipment; the center of the arch is vertically arranged with the center of the invert.

[0040] See also Figure 6 Only a single-layer carriageway is arranged in the upper small-diameter TBM tunnel 3 and the lower small-diameter TBM tunnel 4.

[0041] At the junction of the upper small-diameter TBM tunnel 3 and the dark-excavation conversion tunnel 2, the upper small-diameter TBM tunnel 3 and the lower small-diameter TBM tunnel 4 are arranged vertically, and the structural clearance between the two tunnels is not less than 3m.

[0042] The upper small-diameter TBM tunnel 3 and the lower small-diameter TBM tunnel 4 can freely adjust the plane and longitudinal section layout according to needs.

[0043] The above-mentioned large-diameter TBM tunnel 1, dark-excavation conversion tunnel 2 and small-diameter TBM tunnel structure are provided with primary support 6, waterproof layer 7 and secondary lining 8 from outside to inside, wherein the primary support 6 includes system anchor rods 5, sprayed concrete and steel mesh and steel frame wrapped in the sprayed concrete.

[0044] The construction direction of the above nodes is: single-hole double-layer large-diameter TBM tunnel 1 -> dark-excavation conversion tunnel 2 -> lower-layer small-diameter TBM tunnel 4 -> upper-layer small-diameter TBM tunnel 3. All materials and equipment are transported in and out through the constructed large-diameter TBM tunnel 1.

[0045] This embodiment also provides a construction method for the above-mentioned dark excavation conversion structure, including the following steps:

[0046] S1, excavate the large-diameter TBM tunnel 1 to the boundary stake number between the large-diameter TBM tunnel 1 and the dark-cut conversion tunnel 2, and construct the primary support 6, waterproof layer 7 and secondary lining 8 of the excavated area in sequence;

[0047] S2, the large-diameter TBM continues to excavate along the design line of the upper tunnel until it reaches the boundary pile number between the dark-excavated conversion tunnel 2 and the small-diameter TBM tunnel, and successively constructs the primary support 6 of the upper semicircle of the excavated area of ​​the dark-excavated conversion tunnel 2 and the temporary support measures of the lower semicircle;

[0048] S3, large diameter TBMs are dismantled and transported out through the excavated tunnels;

[0049] S4, transport small-diameter TBM parts from the lower layer through the excavated tunnel and install them;

[0050] S5, the lower layer small diameter TBM tunnel boring machine starts from the boundary stake number between the large diameter TBM tunnel 1 and the dark excavation conversion tunnel 2 and excavates along the lower layer tunnel design line until it reaches the boundary stake number between the dark excavation conversion tunnel 2 and the small diameter TBM tunnel;

[0051] S6, the lower small-diameter TBM tunnel boring machine continues to excavate along the lower tunnel design line, and simultaneously constructs the primary support 6, waterproof layer 7 and secondary lining 8 of the lower small-diameter TBM tunnel 4;

[0052] S7, use mechanical rock drilling to remove the remaining surrounding rock of the dark excavation conversion tunnel 2 and the temporary support measures of the lower semicircle constructed during the construction of the large-diameter shield machine to the designed excavation contour line, and construct the primary support 6 at the side wall and the lower semicircle;

[0053] S8, casting the second lining 8 and the second middle plate b2 of the dark excavation conversion tunnel 2 and the first middle plate b1 of the large-diameter TBM tunnel 1;

[0054] S9, transporting the upper layer small-diameter TBM machine components through the excavated tunnel and installing them above the second middle plate b2 of the dark excavation conversion tunnel 2;

[0055] S10, the upper small-diameter TBM tunnel boring machine starts to excavate forward from the boundary pile number between the dark-excavated conversion tunnel 2 and the small-diameter TBM tunnel, and simultaneously constructs the primary support 6, waterproof layer 7 and secondary lining 8 of the upper small-diameter TBM tunnel 3.

[0056] The dark excavation conversion structure of this embodiment solves the conversion problem between a single-hole double-layer large-diameter TBM tunnel 1 and a double-hole single-layer small-diameter TBM tunnel. During the construction process, all mechanized dark excavation construction is adopted, which has little impact on the ground surface, low cost, strong feasibility, and is worthy of large-scale promotion.

[0057] 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 dark excavation conversion structure between a double-layer TBM tunnel and a single-layer TBM tunnel, characterized in that: It includes a single-hole double-layer large-diameter TBM tunnel, a dark-excavation conversion tunnel, and a double-hole single-layer small-diameter TBM tunnel, wherein the small-diameter TBM tunnel includes a separated upper-layer small-diameter TBM tunnel and a lower-layer small-diameter TBM tunnel; The dark excavation conversion tunnel is located between the large-diameter TBM tunnel and the small-diameter TBM tunnel; The large-diameter TBM tunnel, the dark-excavation conversion tunnel and the small-diameter TBM tunnel structures are all provided with primary support, waterproof layer and secondary lining from the outside to the inside; the excavation section contour line of the dark-excavation conversion tunnel consists of three parts: an arch, an invert and two side walls; the arch is an upper semicircle, which is consistent with the outer diameter of the large-diameter TBM tunnel and is formed by the construction of the large-diameter TBM tunnel boring machine; the invert is a lower semicircle, which is consistent with the outer diameter of the lower small-diameter TBM tunnel and is formed by the construction of the lower small-diameter TBM tunnel boring machine; the two side walls are connected by the external tangents of the upper semicircle and the lower semicircle, and are formed by rock drilling and trimming by mechanical equipment; the center of the arch is vertically arranged with the center of the invert.

2. The dark excavation conversion structure according to claim 1 is characterized in that: The large-diameter TBM tunnel is provided with a first middle plate, an upper tunnel is located above the first middle plate, and a lower tunnel is located below the first middle plate. The longitudinal slope of the upper tunnel of the large-diameter TBM tunnel is consistent with the longitudinal slope of the lower tunnel.

3. The dark excavation conversion structure according to claim 2 is characterized in that: The dark-excavation conversion tunnel is a double-layer structure, with a second middle plate arranged in the middle. The upper layer tunnel is located above the second middle plate, and the lower layer tunnel is located below the second middle plate. The second middle plate descends within a certain range near one end of the upper layer small-diameter TBM tunnel and falls below the bottom of the upper layer small-diameter TBM tunnel to facilitate the exit of the upper layer small-diameter TBM tunnel.

4. The dark excavation conversion structure according to claim 1, characterized in that: The longitudinal slope of the upper tunnel of the dark-excavated conversion tunnel is different from that of the lower tunnel. The net height of the lower tunnel structure of the dark-excavated conversion tunnel is a variable value, which is a small value at one end close to the large-diameter TBM tunnel and a large value at one end close to the small-diameter TBM tunnel.

5. The dark excavation conversion structure according to claim 1, characterized in that: Only a single-layer carriageway is arranged in the upper small-diameter TBM tunnel and the lower small-diameter TBM tunnel.

6. The dark excavation conversion structure according to claim 1, characterized in that: At the junction of the small-diameter TBM tunnel and the dark-excavation conversion tunnel, the upper small-diameter TBM tunnel and the lower small-diameter TBM tunnel are arranged vertically, and the structural clearance between the two tunnels is not less than 3m.

7. The dark excavation conversion structure according to claim 1, characterized in that: The upper small-diameter TBM tunnel and the lower small-diameter TBM tunnel can freely adjust the plane and longitudinal section layout according to needs.

8. A construction method for a dark excavation conversion structure as claimed in claim 3, characterized in that: The following steps are involved: S1. The large-diameter TBM tunnel is excavated to the boundary stake number between the large-diameter TBM tunnel and the dark-cut conversion tunnel, and the primary support, waterproof layer and secondary lining of the excavated area are constructed in sequence; S2. The large-diameter TBM continues to excavate along the design line of the upper tunnel until it reaches the boundary stake number between the dark-cut conversion tunnel and the small-diameter TBM tunnel, and sequentially constructs the initial support of the upper semicircle of the excavated area of ​​the dark-cut conversion tunnel and the temporary support measures of the lower semicircle; S3, large diameter TBMs are dismantled and transported out through the excavated tunnels; S4, transport small-diameter TBM parts from the lower layer through the excavated tunnel and install them; S5, the lower layer small diameter TBM tunnel boring machine starts to excavate along the lower layer tunnel design line from the boundary stake number between the large diameter TBM tunnel and the dark excavation conversion tunnel until the boundary stake number between the dark excavation conversion tunnel and the small diameter TBM tunnel; S6, the lower small-diameter TBM continues to excavate along the lower tunnel design line, and simultaneously constructs the primary support, waterproof layer and secondary lining of the lower small-diameter TBM tunnel; S7, using mechanical rock drilling to remove the remaining surrounding rock of the dark excavation conversion tunnel and the temporary support measures of the lower semicircle constructed during the construction of the large-diameter shield machine to the designed excavation contour line, and constructing the side wall and the initial support of the lower semicircle; S8, pouring the second lining and the second middle plate of the dark excavation conversion tunnel and the first middle plate of the large-diameter TBM tunnel; S9, transporting upper-layer small-diameter TBM components through the excavated tunnel and installing them above the second middle plate of the dark-excavated conversion tunnel; S10, the upper small-diameter TBM tunnel boring machine starts to excavate forward from the boundary pile number between the dark-excavated conversion tunnel and the small-diameter TBM tunnel, and simultaneously constructs the primary support, waterproof layer and secondary lining of the upper small-diameter TBM tunnel.

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