A conversion structure between double-layer and single-layer shield tunnels 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 and a single-layer shield tunnel and a construction method thereof. The conversion structure of the present invention includes a single-hole double-layer large-diameter shield tunnel, a large-diameter shield tunnel working shaft, an open-cut tunnel, a lower-layer small-diameter shield tunnel working, a semi-open-cut and semi-shield tunnel, an upper-layer small-diameter shield tunnel working shaft, and a double-hole single-layer small-diameter shield tunnel. The conversion problem between a single-hole double-layer large-diameter shield tunnel and a double-hole single-layer small-diameter shield tunnel is solved. The construction method of the conversion structure has flexible procedures, and each shield tunnel can enter and exit the tunnel without affecting each other. It has a low cost and strong feasibility, and is worthy of large-scale promotion.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnels, and in particular relates to a conversion structure between a single-hole double-layer large-diameter shield tunnel and a double-hole single-layer small-diameter shield tunnel and a construction method thereof. Background Art

[0002] With the development of cities, my country's shield tunnels, especially large-diameter shield tunnels, have developed rapidly in recent years. When the diameter of the shield machine is large enough, a single-hole double-layer shield tunnel will appear. Single-hole double-layer large-diameter shield 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 shield tunnels will be converted to double-hole single-layer small-diameter shield tunnels. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a conversion structure between double-layer and single-layer shield tunnels and a construction method thereof, aiming to solve the conversion problem between a single-hole double-layer large-diameter shield tunnel and a double-hole single-layer small-diameter shield tunnel.

[0004] The present invention is implemented as follows: a conversion structure between a double-layer and a single-layer shield tunnel includes a single-hole double-layer large-diameter shield tunnel, a large-diameter shield tunnel working shaft, an open-cut tunnel, a lower-layer small-diameter shield tunnel working shaft, a semi-open-cut and semi-shield tunnel, an upper-layer small-diameter shield tunnel working shaft, and a double-hole single-layer small-diameter shield tunnel, wherein the small-diameter shield tunnel includes a separated upper-layer small-diameter shield tunnel and a lower-layer small-diameter shield tunnel; the large-diameter shield tunnel working shaft is located between the large-diameter shield tunnel and the open-cut tunnel, the lower-layer small-diameter shield tunnel working shaft is located between the semi-open-cut and semi-shield tunnel and the open-cut tunnel, and the upper-layer small-diameter shield tunnel working shaft is located between the semi-open-cut and semi-shield tunnel and the small-diameter shield tunnel.

[0005] Furthermore, the large-diameter shield tunnel working shaft, open-cut tunnel, and lower-level small-diameter shield tunnel working shaft are all double-layer reinforced concrete frame structures, and the double-layer reinforced concrete frame structure includes a first top plate, a first middle plate, a first bottom plate, and a first side wall. The upper layer tunnel is above the first middle plate, and the lower layer tunnel is below the first middle plate. The longitudinal slope of the upper layer tunnel is inconsistent with the longitudinal slope of the lower layer tunnel.

[0006] Furthermore, the upper small-diameter shield tunnel working shaft and the open-cut tunnel in the semi-open-cut and semi-shield tunnel section are single-layer reinforced concrete frame structures, and the single-layer reinforced concrete frame structure includes a second top plate, a second bottom plate and a second side wall, and the internal space of the single-layer reinforced concrete frame structure is the upper tunnel.

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

[0008] Furthermore, the first middle plate of the large-diameter shield tunnel working shaft is flush with the first middle plate of the open-cut tunnel section and the third middle plate of the large-diameter shield tunnel section; the first top plate of the large-diameter shield tunnel working shaft is higher than the top of the large-diameter shield tunnel and the top of the open-cut tunnel, and the first bottom plate of the large-diameter shield tunnel working shaft is lower than the bottom of the large-diameter shield tunnel and the bottom of the open-cut tunnel. The internal clearance formed by the first top plate, the first bottom plate and the first side wall of the large-diameter shield tunnel working shaft is larger than the outer diameter of the large-diameter shield tunnel, which facilitates the large-diameter shield tunnel to enter and exit the cave.

[0009] Furthermore, at the working shaft of the lower small-diameter shield tunnel, the first top plate of the working shaft of the lower small-diameter shield tunnel is flush with the second top plate of the semi-open-cut and semi-shield tunnel and the first top plate of the open-cut tunnel; the first middle plate of the working shaft of the lower small-diameter shield tunnel is flush with the second bottom plate of the semi-open-cut and semi-shield tunnel and the first middle plate of the open-cut tunnel; the first bottom plate of the working shaft of the lower small-diameter shield tunnel is lower than the bottom of the lower small-diameter shield tunnel and the bottom of the open-cut tunnel, and the inner clearance formed by the first middle plate, the first bottom plate and the first side wall of the working shaft of the lower small-diameter shield tunnel is larger than the outer diameter of the lower small-diameter shield tunnel, which facilitates the lower small-diameter shield tunnel to enter and exit the cave.

[0010] Furthermore, the second top plate of the upper small-diameter shield tunnel working shaft is higher than the top of the upper small-diameter shield tunnel and the second top plate of the semi-open-cut and semi-shield tunnel, and the second bottom plate of the upper small-diameter shield tunnel working shaft is lower than the bottom of the upper small-diameter shield tunnel and the second bottom plate of the semi-open-cut and semi-shield tunnel. The inner clearance formed by the second top plate, the second bottom plate and the second side wall of the upper small-diameter shield tunnel working shaft is larger than the outer diameter of the upper small-diameter shield tunnel, which facilitates the upper small-diameter shield tunnel to enter and exit the cave.

[0011] Furthermore, only single-layer carriageways are arranged in the upper small-diameter shield tunnel and the lower small-diameter shield tunnel; at the entrance and exit of the working shaft of the lower small-diameter shield tunnel, the structural clearance between the lower small-diameter shield tunnel and the second bottom plate of the open-cut tunnel of the semi-open-cut and semi-shield tunnel section is not less than 3m; at the entrance and exit of the working shaft of the upper small-diameter shield tunnel, the upper small-diameter shield tunnel and the lower small-diameter shield tunnel are arranged vertically, and the structural clearance between the two tunnels is not less than 3m.

[0012] Furthermore, temporary end walls are provided at the connection points of the large-diameter shield tunnel working shaft, the lower-level small-diameter shield tunnel working shaft, and the upper-level small-diameter shield tunnel working shaft, and at the same time, a certain range of the foundation outside the end wall of each working shaft is reinforced, and the end wall is chiseled out when the shield tunnel enters and exits the cave.

[0013] Furthermore, lifting holes for lifting materials and equipment are reserved at the first top plate of the large-diameter shield tunnel working shaft, the first top plate and the first middle plate of the lower small-diameter shield tunnel working shaft, and the second top plate of the upper small-diameter shield tunnel working shaft.

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

[0015] 1. When the large-diameter shield tunnel working shaft, the lower-layer small-diameter shield tunnel working shaft, and the upper-layer small-diameter shield tunnel working shaft are receiving shafts, the above steps are included:

[0016] S11, construct the large-diameter shield tunnel working shaft, open-cut tunnel, lower-level small-diameter shield tunnel working shaft, upper-level small-diameter shield tunnel working shaft foundation pit support structure, and the open-cut tunnel foundation pit support structure in the semi-open-cut and semi-shield tunnel;

[0017] S12, processing the outer foundation of the head wall of the large-diameter shield tunnel working shaft, the lower small-diameter shield tunnel working shaft, and the upper small-diameter shield tunnel working shaft;

[0018] S13, construct the main structure of the large-diameter shield tunnel working shaft, the open-cut tunnel, the lower-level small-diameter shield tunnel working shaft, the upper-level small-diameter shield tunnel working shaft, and the main structure of the open-cut tunnel in the semi-open-cut and semi-shield tunnel, and reserve corresponding hoisting holes at the first top plate of the large-diameter shield tunnel working shaft, the first top plate and the first middle plate of the lower-level small-diameter shield tunnel working shaft, and the second top plate of the upper-level small-diameter shield tunnel. The first middle plate of the large-diameter shield tunnel working shaft is not cast for the time being;

[0019] S14. Determine the time for shield machines on both sides to enter the tunnel according to the progress of shield tunnel construction, and the shield machines on both sides will not affect each other;

[0020] S15: When a large diameter shield machine enters the tunnel, construction shall be carried out in the following order:

[0021] The large-diameter shield machine enters the tunnel—> the shield machine is dismantled and lifted out from the hoisting hole reserved in the working shaft of the large-diameter shield tunnel—> the large-diameter shield equipment is lifted out of the working shaft and the first middle plate of the working shaft of the large-diameter shield tunnel is cast—> finally, the structure of the reserved hoisting hole of the first top plate of the working shaft of the large-diameter shield tunnel is constructed;

[0022] S16: When a small diameter shield enters the tunnel, construction shall be carried out in the following order:

[0023] The lower-level small-diameter shield machine enters the cave—>the ​​lower-level small-diameter shield machine is dismantled and hoisted out from the reserved hoisting holes in the lower-level small-diameter shield tunnel working shaft—>the ​​structures of the reserved hoisting holes on the first middle plate and the first top plate of the lower-level small-diameter shield tunnel working shaft are constructed in sequence—>the ​​upper-level small-diameter shield machine enters the cave—>the ​​upper-level small-diameter shield machine is dismantled and hoisted out from the reserved hoisting holes on the second top plate of the upper-level small-diameter shield tunnel working shaft—>the ​​structures of the reserved hoisting holes on the second top plate of the upper-level small-diameter shield tunnel working shaft are constructed.

[0024] 2. When the large-diameter shield tunnel working shaft, the lower-layer small-diameter shield tunnel working shaft, and the upper-layer small-diameter shield tunnel working shaft are starting shafts, the above steps are included:

[0025] S21, construct the foundation pit support structure of the large-diameter shield tunnel working shaft, open-cut tunnel, lower-level small-diameter shield tunnel working shaft, upper-level small-diameter shield tunnel working shaft, and the open-cut tunnel foundation pit support structure in the semi-open-cut and semi-shield tunnel;

[0026] S22, processing the outer foundation of the head wall of the large-diameter shield tunnel working shaft, the lower small-diameter shield tunnel working shaft, and the upper small-diameter shield tunnel working shaft;

[0027] S23, construct the main structure of the large-diameter shield tunnel working shaft, open-cut tunnel, lower-level small-diameter shield tunnel working shaft, upper-level small-diameter shield tunnel working shaft and the open-cut tunnel main structure in the semi-open-cut and semi-shield tunnel, and reserve corresponding hoisting holes at the first top plate of the large-diameter shield tunnel working shaft, the first top plate and the first middle plate of the lower-level small-diameter shield tunnel working shaft, and the second top plate of the upper-level small-diameter shield tunnel. The first middle plate of the large-diameter shield tunnel working shaft is not cast for the time being;

[0028] S24. Determine the time for shield machines on both sides to exit the tunnel according to the construction progress requirements of the shield tunnel, and the exit of shield machines on both sides will not affect each other;

[0029] S25: When the large diameter shield machine exits the tunnel, construction shall be carried out in the following order:

[0030] The large-diameter shield machine equipment is hoisted in from the large-diameter shield tunnel working shaft and assembled - > the large-diameter shield machine exits the tunnel - > the first middle plate of the large-diameter shield tunnel working shaft is constructed, and hoisting holes are reserved at corresponding positions - > the large-diameter shield tunnel construction is completed - > the structure of the reserved holes of the first middle plate and the first top plate of the large-diameter shield tunnel working shaft is constructed.

[0031] S26: When the lower layer small diameter shield machine exits the tunnel, construction shall be carried out in the following order:

[0032] The lower-level small-diameter shield machine equipment is hoisted in from the lower-level small-diameter shield tunnel working shaft and assembled - > the lower-level small-diameter shield machine exits the tunnel - > the construction of the lower-level small-diameter shield tunnel is completed - > the structure of the reserved holes of the first middle plate and the first top plate of the lower-level small-diameter shield tunnel working shaft is constructed.

[0033] S27. After the lower layer small-diameter shield machine passes under the upper layer small-diameter shield tunnel working shaft, the upper layer small-diameter shield machine exits the hole. When the upper layer small-diameter shield machine exits the hole, construction shall be carried out in the following order:

[0034] The upper small-diameter shield machine equipment is hoisted in from the upper small-diameter shield tunnel working shaft and assembled - > the upper small-diameter shield machine exits the tunnel - > the construction of the upper small-diameter shield tunnel is completed - > the structure of the reserved hole on the second top plate of the upper small-diameter shield tunnel working shaft is constructed.

[0035] 3. When the large-diameter shield tunnel working shaft is the receiving shaft, and the lower small-diameter shield tunnel working shaft and the upper small-diameter shield tunnel working shaft are the starting shafts, or when the large-diameter shield tunnel working shaft is the starting shaft, and the lower small-diameter shield tunnel working shaft and the upper small-diameter shield tunnel working shaft are the receiving shafts, the corresponding construction method can be a combination of construction methods 1 and 2.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The conversion structure of the present invention includes a single-hole double-layer large-diameter shield tunnel, a large-diameter shield tunnel working shaft, an open-cut tunnel, a lower-layer small-diameter shield tunnel working shaft, a semi-open-cut and semi-shield tunnel, an upper-layer small-diameter shield tunnel working shaft, and a double-hole single-layer small-diameter shield tunnel. The conversion problem between a single-hole double-layer large-diameter shield tunnel and a double-hole single-layer small-diameter shield tunnel is solved. The construction method of the conversion structure has flexible procedures, each shield tunnel can enter and exit the tunnel without affecting each other, and the cost is low, the feasibility is strong, and it is worth promoting on a large scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the plan layout of a conversion structure of a single-hole double-layer tunnel and a double-hole single-layer tunnel provided by an embodiment of the present invention;

[0039] Figure 2 yes Figure 1 A schematic diagram of the longitudinal section arrangement of the conversion structure shown;

[0040] Figure 3 is a schematic cross-sectional view of a large-diameter shield tunnel of a conversion structure provided by an embodiment of the present invention;

[0041] Figure 4 It is a cross-sectional schematic diagram of a large-diameter shield tunnel working shaft of a conversion structure provided by an embodiment of the present invention;

[0042] Figure 5 is a schematic cross-sectional view of an open-cut tunnel of a conversion structure provided by an embodiment of the present invention;

[0043] Figure 6 is a cross-sectional schematic diagram of a lower small-diameter shield tunnel working shaft of a conversion structure provided by an embodiment of the present invention;

[0044] Figure 7 is a cross-sectional schematic diagram of a semi-open cut and semi-shield tunnel of a conversion structure provided by an embodiment of the present invention;

[0045] Figure 8 is a cross-sectional schematic diagram of an upper small-diameter shield tunnel working shaft of a conversion structure provided by an embodiment of the present invention;

[0046] Fig. 9 It is a schematic cross-sectional view of a double-hole single-layer small-diameter shield tunnel of a conversion structure provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0047] 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.

[0048] 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.

[0049] See also Figure 1 and Figure 2, shows a preferred embodiment provided by the present invention, a conversion structure between double-layer and single-layer shield tunnels, including a single-hole double-layer large-diameter shield tunnel 1, a large-diameter shield tunnel working shaft 2, an open-cut tunnel 3 (i.e., a full open-cut tunnel), a lower-layer small-diameter shield tunnel working shaft 4, a semi-open-cut and semi-shield tunnel 5, an upper-layer small-diameter shield tunnel working shaft 6, and a double-hole single-layer small-diameter shield tunnel. The above-mentioned small-diameter shield tunnel includes a separated upper-layer small-diameter shield tunnel 7 and a lower-layer small-diameter shield tunnel 8.

[0050] like Figure 1 and Figure 2 As shown, the above-mentioned large-diameter shield tunnel working shaft 2 is located between the large-diameter shield tunnel 1 and the open-cut tunnel 3, the lower-level small-diameter shield tunnel working shaft 4 is located between the semi-open-cut and semi-shield tunnel 5 and the open-cut tunnel 3, and the upper-level small-diameter shield tunnel working shaft 6 is located between the semi-open-cut and semi-shield tunnel 5 and the small-diameter shield tunnel.

[0051] See also Figures 4 to 6 The above-mentioned large-diameter shield tunnel working shaft 2, open-cut tunnel 3, and lower-level small-diameter shield tunnel working shaft 4 are all double-layer reinforced concrete frame structures, which include a first top plate a1, a first middle plate b1, a first bottom plate c1, and a first side wall d1. 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 is inconsistent with the longitudinal slope of the lower layer tunnel.

[0052] See also Figure 7 and Figure 8 The above-mentioned upper small-diameter shield tunnel working shaft 6 and the open-cut tunnel in the semi-open-cut and semi-shield tunnel 5 are single-layer reinforced concrete frame structures, which include a second top plate a2, a second bottom plate c2 and a second side wall d2. The internal space of the single-layer reinforced concrete frame structure is the upper tunnel.

[0053] The above-mentioned large-diameter shield tunnel working shaft 2, open-cut tunnel 3, upper small-diameter shield tunnel working shaft 6, open-cut tunnel in semi-open-cut and semi-shield tunnel 5, and lower small-diameter shield tunnel working shaft 4 are all constructed using the open-cut method, and foundation pit retaining structures are provided on the outside of the structures.

[0054] For details, see Figure 3The large-diameter shield tunnel 1 has a third middle plate b3, above the third middle plate b3 of the large-diameter shield tunnel is the upper tunnel, below the third middle plate b3 is the lower tunnel, and the longitudinal slope of the upper tunnel of the large-diameter shield tunnel 1 is consistent with the longitudinal slope of the lower tunnel. The first middle plate b1 of the large-diameter shield tunnel working shaft 2 is flush with the first middle plate b1 of the open-cut tunnel 3 and the third middle plate b3 of the large-diameter shield tunnel 1. The first top plate a1 of the large-diameter shield tunnel working shaft 2 is higher than the top of the large-diameter shield tunnel 1 and the top of the open-cut tunnel 3, and the first bottom plate c1 of the large-diameter shield tunnel working shaft 2 is lower than the bottom of the large-diameter shield tunnel 1 and the bottom of the open-cut tunnel 3. The inner clearance formed by the first top plate a1, the first bottom plate c1, and the first side wall d1 of the large-diameter shield tunnel working shaft 2 is larger than the outer diameter of the large-diameter shield tunnel 1, which is convenient for the large-diameter shield tunnel 1 to enter and exit the cave.

[0055] The longitudinal slopes of the upper tunnel and the lower tunnel of the open-cut tunnel 3 are different. The longitudinal slope of the lower tunnel is greater than that of the upper tunnel. The net height of the lower tunnel structure is a variable value, which is a small value near the end 2 of the large-diameter shield tunnel working shaft, and a large value near the end 6 of the upper-diameter shield tunnel working shaft / the end 4 of the lower-diameter shield tunnel working shaft.

[0056] The first top plate a1 of the lower small-diameter shield tunnel working shaft 4 is flush with the second top plate a2 of the semi-open-cut and semi-shield tunnel 5 and the first top plate a1 of the open-cut tunnel 3. The first middle plate b1 of the lower small-diameter shield tunnel working shaft 4 is flush with the second bottom plate c2 of the semi-open-cut and semi-shield tunnel 5 and the first middle plate b3 of the open-cut tunnel 3. The first bottom plate c1 of the lower small-diameter shield tunnel working shaft 4 is lower than the bottom of the lower small-diameter shield tunnel 8 and the bottom of the open-cut tunnel 3. The inner clearance formed by the first middle plate b1, the first bottom plate c1 and the first side wall d1 of the lower small-diameter shield tunnel working shaft 4 is larger than the outer diameter of the lower small-diameter shield tunnel 8, which facilitates the lower small-diameter shield tunnel 8 to enter and exit the cave.

[0057] For further information, see Fig. 9 Only a single-layer carriageway is arranged in the upper small-diameter shield tunnel 7 and the lower small-diameter shield tunnel 8. At the entrance and exit of the lower small-diameter shield tunnel working shaft 4, the structural clearance between the lower small-diameter shield tunnel 8 and the second bottom plate c2 of the open-cut tunnel 3 of the semi-open-cut and semi-shield tunnel section 5 is not less than 3m.

[0058] The second top plate a2 of the upper small-diameter shield tunnel working shaft 6 is higher than the top of the upper small-diameter shield tunnel 7 and the second top plate a2 of the open-cut tunnel of the semi-open-cut and semi-shield tunnel 5. The second bottom plate c2 of the upper small-diameter shield tunnel working shaft 6 is lower than the bottom of the upper small-diameter shield tunnel section 7 and the second bottom plate c2 of the open-cut tunnel of the semi-open-cut and semi-shield tunnel section 5. The inner clearance formed by the second top plate a2, the second bottom plate c2 and the second side wall d2 of the upper small-diameter shield tunnel working shaft 6 is larger than the outer diameter of the upper small-diameter shield tunnel 7, so that the upper small-diameter shield tunnel 7 can enter and exit the cave easily.

[0059] At the entrance and exit of the upper small-diameter shield tunnel working shaft 6, the upper small-diameter shield tunnel 7 and the lower small-diameter shield tunnel 8 are arranged vertically, and the clear distance between the two tunnel structures is not less than 3m. The separated upper small-diameter shield tunnel section 7 and the lower small-diameter shield tunnel section 8 can freely adjust the plane and longitudinal section layout as needed.

[0060] Temporary end walls are set at the connection points of the shield tunnels for the large-diameter shield tunnel working shaft 2, the lower-level small-diameter shield tunnel working shaft 4, and the upper-level small-diameter shield tunnel working shaft 6. The end walls are chiseled out when the shield tunnel enters and exits the cave, and the foundation of a certain range outside the end walls of each working shaft is reinforced. The lower-level small-diameter shield tunnel 8 is constructed before the upper-level small-diameter shield tunnel 7.

[0061] Lifting holes for lifting materials and equipment are reserved at the first top plate a1 of the large-diameter shield tunnel working shaft 2, the first top plate a1 and the first middle plate b1 of the lower small-diameter shield tunnel working shaft 4, and the second top plate a2 of the upper small-diameter shield tunnel working shaft 6.

[0062] This embodiment also provides a construction method for the above conversion structure:

[0063] 1. When the large-diameter shield tunnel working shaft 2, the lower-layer small-diameter shield tunnel working shaft 4, and the upper-layer small-diameter shield tunnel working shaft 6 are receiving shafts, the above steps are included:

[0064] S11, construction of large-diameter shield tunnel working shaft 2, open-cut tunnel 3, lower-level small-diameter shield tunnel working shaft 4, upper-level small-diameter shield tunnel working shaft 6 foundation pit support structure 9, and open-cut tunnel foundation pit support structure 9 in semi-open-cut and semi-shield tunnel 5;

[0065] S12, processing the outer foundation of the head wall of the large-diameter shield tunnel working shaft 2, the lower small-diameter shield tunnel working shaft 4, and the upper small-diameter shield tunnel working shaft 6;

[0066] S13, construct the main structures of the large-diameter shield tunnel working shaft 2, the open-cut tunnel 3, the lower-level small-diameter shield tunnel working shaft 4, the upper-level small-diameter shield tunnel working shaft 6, and the main structure of the open-cut tunnel in the semi-open-cut and semi-shield tunnel 5, and reserve corresponding hoisting holes at the first top plate a1 of the large-diameter shield tunnel working shaft 2, the first top plate a1 and the first middle plate b1 of the lower-level small-diameter shield tunnel working shaft 4, and the second top plate a1 of the upper-level small-diameter shield tunnel 7, and the first middle plate b1 of the large-diameter shield tunnel working shaft 2 is not cast for the time being;

[0067] S14. Determine the time for shield machines on both sides to enter the tunnel according to the progress of shield tunnel construction, and the shield machines on both sides will not affect each other;

[0068] S15: When a large diameter shield machine enters the tunnel, construction shall be carried out in the following order:

[0069] The large-diameter shield machine enters the tunnel—>The shield machine is dismantled and lifted out from the reserved lifting hole of the large-diameter shield tunnel working shaft 2—>After the large-diameter shield equipment is lifted out of the working shaft, the first middle plate b1 of the large-diameter shield tunnel working shaft 2 is cast—>Finally, the structure of the reserved lifting hole of the first top plate a1 of the large-diameter shield tunnel working shaft 2 is constructed;

[0070] S16: When a small diameter shield enters the tunnel, construction shall be carried out in the following order:

[0071] The lower-level small-diameter shield machine enters the cave—>The lower-level small-diameter shield machine is dismantled and hoisted out from the reserved hoisting hole at the lower-level small-diameter shield tunnel working shaft 4—>The structures at the reserved hoisting holes at the first middle plate b1 and the first top plate a1 of the lower-level small-diameter shield tunnel working shaft 4 are constructed in sequence—>The upper-level small-diameter shield machine enters the cave—>The upper-level small-diameter shield machine is dismantled and hoisted out from the reserved hoisting hole at the second top plate a2 of the upper-level small-diameter shield tunnel working shaft 6—>Construct the structure at the reserved hoisting hole at the second top plate a2 of the upper-level small-diameter shield tunnel working shaft.

[0072] 2. When the large-diameter shield tunnel working shaft 2, the lower-layer small-diameter shield tunnel working shaft 4, and the upper-layer small-diameter shield tunnel working shaft 6 are the starting shafts, the above steps are included:

[0073] S21, construction of the foundation pit support structure 9 of the large-diameter shield tunnel working shaft 2, the open-cut tunnel 3, the lower-level small-diameter shield tunnel working shaft 4, the upper-level small-diameter shield tunnel working shaft 6, and the open-cut tunnel foundation pit support structure 9 in the semi-open-cut and semi-shield tunnel 5;

[0074] S22, processing the outer foundation of the head wall of the large-diameter shield tunnel working shaft 2, the lower small-diameter shield tunnel working shaft 4, and the upper small-diameter shield tunnel working shaft 6;

[0075] S23, construct the main structures of the large-diameter shield tunnel working shaft 2, the open-cut tunnel 3, the lower-level small-diameter shield tunnel working shaft 4, the upper-level small-diameter shield tunnel working shaft 6, and the open-cut tunnel main structure in the semi-open-cut and semi-shield tunnel 5, and reserve corresponding hoisting holes at the first top plate a1 of the large-diameter shield tunnel working shaft 2, the first top plate a1 and the first middle plate b1 of the lower-level small-diameter shield tunnel working shaft 4, and the second top plate a2 of the upper-level small-diameter shield tunnel section 7, and the first middle plate b1 of the large-diameter shield tunnel working shaft 2 will not be cast for the time being;

[0076] S24. Determine the time for shield machines on both sides to exit the tunnel according to the construction progress requirements of the shield tunnel, and the exit of shield machines on both sides will not affect each other;

[0077] S25: When the large diameter shield machine exits the tunnel, construction shall be carried out in the following order:

[0078] The large-diameter shield machine equipment is hoisted in from the large-diameter shield tunnel working shaft 2 and assembled—>the ​​large-diameter shield machine exits the tunnel—>the ​​first middle plate b1 of the large-diameter shield tunnel working shaft 2 is constructed, and hoisting holes are reserved at corresponding positions—>the ​​construction of the large-diameter shield tunnel section 1 is completed—>the ​​first middle plate b1 of the large-diameter shield tunnel working shaft 2 and the first top plate a1 reserved hole structure are constructed.

[0079] S26: When the lower layer small diameter shield machine exits the tunnel, construction shall be carried out in the following order:

[0080] The lower-level small-diameter shield machine equipment is hoisted in from the lower-level small-diameter shield tunnel working shaft 4 and assembled—>the ​​lower-level small-diameter shield machine exits the hole—>the ​​construction of the lower-level small-diameter shield tunnel 8 is completed—>the ​​structure of the reserved holes of the first middle plate b1 and the first top plate a1 of the lower-level small-diameter shield tunnel working shaft 4 is constructed.

[0081] S27, after the lower layer small diameter shield machine passes under the upper layer small diameter shield tunnel working shaft 6, the upper layer small diameter shield machine exits the hole. When the upper layer small diameter shield machine exits the hole, construction is carried out in the following order:

[0082] The upper small-diameter shield machine equipment is hoisted in from the upper small-diameter shield tunnel working shaft 6 and assembled - > the upper small-diameter shield machine exits the hole - > the construction of the upper small-diameter shield tunnel 7 is completed - > the structure of the reserved hole at the second top plate a2 of the upper small-diameter shield tunnel working shaft 6 is constructed.

[0083] It is easy to understand that when the large-diameter shield tunnel working shaft 2, the lower-level small-diameter shield tunnel working shaft 4, and the upper-level small-diameter shield tunnel working shaft 6 are not receiving shafts or starting shafts at the same time, it is sufficient to refer to the combination of the above two construction methods.

[0084] In summary, this embodiment solves the conversion problem between a single-hole double-layer large-diameter shield tunnel and a double-hole single-layer small-diameter shield tunnel. The process is flexible, the entry and exit of each shield tunnel do not affect each other, and the cost is low and the feasibility is strong, which is worthy of large-scale promotion.

[0085] 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 a conversion structure between a double-layer and a single-layer shield tunnel, the conversion structure comprising a single-hole double-layer large-diameter shield tunnel, a large-diameter shield tunnel working shaft, an open-cut tunnel, a lower-layer small-diameter shield tunnel working shaft, a semi-open-cut and semi-shield tunnel, an upper-layer small-diameter shield tunnel working shaft, and a double-hole single-layer small-diameter shield tunnel, the small-diameter shield tunnel comprising a separated upper-layer small-diameter shield tunnel and a lower-layer small-diameter shield tunnel; the large-diameter shield tunnel working shaft is located between the large-diameter shield tunnel and the open-cut tunnel, the lower-layer small-diameter shield tunnel working shaft is located between the semi-open-cut and semi-shield tunnel and the open-cut tunnel, the upper-layer small-diameter shield tunnel working shaft is located between the semi-open-cut and semi-shield tunnel and the small-diameter shield tunnel; the upper-layer small-diameter shield tunnel The open-cut tunnel in the tunnel working shaft and the semi-open-cut and semi-shield tunnel is a single-layer reinforced concrete frame structure, which includes a second top plate, a second bottom plate and a second side wall, and the internal space of the single-layer reinforced concrete frame structure is the upper tunnel; the large-diameter shield tunnel working shaft, the lower small-diameter shield tunnel working shaft, and the upper small-diameter shield tunnel working shaft are provided with temporary head walls at the connection points of the shield tunnels, and at the same time, a certain range of foundation outside the head walls of each working shaft is reinforced, and the head walls are chiseled out when the shield tunnel enters and exits the tunnel; hoisting holes for hoisting materials and equipment are respectively reserved at the first top plate of the large-diameter shield tunnel working shaft, the first top plate and the first middle plate of the lower small-diameter shield tunnel working shaft, and the second top plate of the upper small-diameter shield tunnel working shaft; It is characterized in that When the large-diameter shield tunnel working shaft, the lower-layer small-diameter shield tunnel working shaft, and the upper-layer small-diameter shield tunnel working shaft are receiving shafts, the following steps are included: S11, construct the large-diameter shield tunnel working shaft, open-cut tunnel, lower-level small-diameter shield tunnel working shaft, upper-level small-diameter shield tunnel working shaft foundation pit support structure, and the open-cut tunnel foundation pit support structure in the semi-open-cut and semi-shield tunnel; S12, processing the outer foundation of the head wall of the large-diameter shield tunnel working shaft, the lower small-diameter shield tunnel working shaft, and the upper small-diameter shield tunnel working shaft; S13, construct the main structure of the large-diameter shield tunnel working shaft, the open-cut tunnel section, the lower-level small-diameter shield tunnel working shaft, the upper-level small-diameter shield tunnel working shaft, and the main structure of the open-cut tunnel in the semi-open-cut and semi-shield tunnel section, and reserve corresponding hoisting holes at the first top plate of the large-diameter shield tunnel working shaft, the first top plate and the first middle plate of the lower-level small-diameter shield tunnel working shaft, and the second top plate of the upper-level small-diameter shield tunnel section. The first middle plate of the large-diameter shield tunnel working shaft is not cast for the time being; S14. Determine the time for shield machines on both sides to enter the tunnel according to the progress of shield tunnel construction, and the shield machines on both sides will not affect each other; S15: When a large diameter shield machine enters the tunnel, construction shall be carried out in the following order: The large-diameter shield machine enters the tunnel—> the shield machine is dismantled and lifted out from the hoisting hole reserved in the working shaft of the large-diameter shield tunnel—> the large-diameter shield equipment is lifted out of the working shaft and the first middle plate of the working shaft of the large-diameter shield tunnel is cast—> finally, the structure of the reserved hoisting hole of the first top plate of the working shaft of the large-diameter shield tunnel is constructed; S16: When a small diameter shield enters the tunnel, construction shall be carried out in the following order: The lower-level small-diameter shield machine enters the cave—>dismantles the lower-level small-diameter shield machine and hoists it out from the reserved hoisting holes in the working shaft of the lower-level small-diameter shield tunnel—>constructs the structures of the reserved hoisting holes on the first middle plate and the first top plate of the working shaft of the lower-level small-diameter shield tunnel in sequence—>the ​​upper-level small-diameter shield machine enters the cave—>dismantles the upper-level small-diameter shield machine and hoists it out from the reserved hoisting holes on the second top plate of the working shaft of the upper-level small-diameter shield tunnel—>constructs the structures of the reserved hoisting holes on the second top plate of the working shaft of the upper-level small-diameter shield tunnel.

2. A construction method of a conversion structure as claimed in claim 1, characterized in that: When the large-diameter shield tunnel working shaft, the lower-layer small-diameter shield tunnel working shaft, and the upper-layer small-diameter shield tunnel working shaft are starting shafts, the following steps are included: S21, construct the foundation pit support structure of the large-diameter shield tunnel working shaft, open-cut tunnel, lower-level small-diameter shield tunnel working shaft, upper-level small-diameter shield tunnel working shaft, and the foundation pit support structure of the open-cut tunnel in the semi-open-cut and semi-shield tunnel; S22, processing the outer foundation of the head wall of the large-diameter shield tunnel working shaft, the lower small-diameter shield tunnel working shaft, and the upper small-diameter shield tunnel working shaft; S23, construct the main structure of the large-diameter shield tunnel working shaft, open-cut tunnel, lower-level small-diameter shield tunnel working shaft, upper-level small-diameter shield tunnel working shaft and the open-cut tunnel main structure in the semi-open-cut and semi-shield tunnel, and reserve corresponding hoisting holes at the first top plate of the large-diameter shield tunnel working shaft, the first top plate and the first middle plate of the lower-level small-diameter shield tunnel working shaft, and the second top plate of the upper-level small-diameter shield tunnel. The first middle plate of the large-diameter shield tunnel working shaft is not cast for the time being; S24. Determine the time for shield machines on both sides to exit the tunnel according to the construction progress requirements of the shield tunnel, and the exit of shield machines on both sides will not affect each other; S25: When the large diameter shield machine exits the tunnel, construction shall be carried out in the following order: The large-diameter shield machine equipment is hoisted in from the working shaft of the large-diameter shield tunnel and assembled—>the ​​large-diameter shield machine exits the tunnel—>the ​​first middle plate of the working shaft of the large-diameter shield tunnel is constructed, and hoisting holes are reserved at corresponding positions—>the ​​construction of the large-diameter shield tunnel is completed—>the ​​structure of the reserved holes of the first middle plate and the first top plate of the working shaft of the large-diameter shield tunnel is constructed; S26: When the lower layer small diameter shield machine exits the tunnel, construction shall be carried out in the following order: The lower layer small diameter shield machine equipment is hoisted in from the lower layer small diameter shield tunnel working shaft and assembled - > the lower layer small diameter shield machine exits the tunnel - > the lower layer small diameter shield tunnel construction is completed - > the structure of the reserved holes of the first middle plate and the first top plate of the lower layer small diameter shield tunnel working shaft is constructed; S27. After the lower layer small-diameter shield machine passes under the upper layer small-diameter shield tunnel working shaft, the upper layer small-diameter shield machine exits the tunnel. The construction sequence for the upper layer small-diameter shield machine exiting the tunnel is as follows: The upper small-diameter shield machine equipment is hoisted in from the upper small-diameter shield tunnel working shaft and assembled - > the upper small-diameter shield machine exits the tunnel - > the construction of the upper small-diameter shield tunnel is completed - > the structure of the reserved hole on the second top plate of the upper small-diameter shield tunnel working shaft is constructed.

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