Vertical shaft construction method for meeting construction of tunnels with different elevations

Abstract

The invention discloses a vertical shaft construction method for meeting construction of tunnels with different elevations, which comprises a deep shaft and a shallow shaft which are arranged in parallel, during construction, S1, construction is performed by adopting a reverse method, subsection excavation is performed downwards from the ground, and construction of a shaft wall and a diagonal bracing plate of an excavated section is completed before excavation work of a next section is started until construction of the shallow shaft is completed; s2, after construction of the second bottom plate is completed, construction of the deep well continues to be conducted through the reverse construction method, and after excavation is conducted by a certain depth every time, construction of the excavation section of the well wall is conducted till construction of the deep well is completed; s3, after construction of the vertical shaft main body is completed, the shallow shaft is used as a construction channel of the high tunnel, and high tunnel construction is conducted; and the deep well is used as a construction channel of the low tunnel, and construction of the low tunnel is conducted. According to the invention, project construction investment is reduced, and construction management is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction in water conservancy and hydropower projects, and particularly relates to a shaft construction method for meeting the construction of tunnels at different elevations. Background Art

[0002] With the rapid development of social economy, the number of water diversion tunnel projects in China is gradually increasing. In order to avoid buildings or unfavorable geological zones, some tunnels need to be depressed or lifted, resulting in sudden changes in the elevation of the tunnels and tunnels at different elevations. Since the tunnels are buried underground, construction access tunnels and shafts need to be set up for construction. For such tunnels at different elevations, multiple construction access tunnels or shafts usually need to be set up to meet the needs of mucking, material and equipment transportation for tunnels at different elevations. However, the above multi-access tunnel / shaft construction method not only has a large investment, but also further increases the project investment because multiple sets of mucking equipment need to be configured. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a shaft construction method for meeting the construction of tunnels at different elevations with a relatively low investment amount. Specifically, the following technical solutions can be adopted: The shaft construction method for meeting the construction of tunnels at different elevations according to the present invention is suitable for a shaft main body extending downward from the ground, and is characterized in that: The shaft main body includes a deep well and a shallow well arranged in parallel. The deep well is arranged close to the side of the low tunnel, and the shallow well is arranged close to the side of the high tunnel. The deep well and the shallow well are separated by a bracing plate. A first bottom plate is arranged at the bottom of the deep well, and a second bottom plate is arranged at the bottom of the shallow well. A first opening communicating with the low tunnel is arranged on the side wall of the deep well, and a second opening communicating with the high tunnel is arranged on the side wall of the shallow well; The construction method includes the following steps: S1, adopting the inverse construction method, starting from the ground and excavating downward in sections, and completing the construction of the shaft wall and the bracing plate of the excavated section before starting the next excavation work. When excavating to the elevation where the second bottom plate is located, first construct the shaft wall and the bracing plate of this section, and then construct the second bottom plate to complete the construction of the shallow well; S2, after the construction of the second bottom plate is completed, continue to adopt the inverse construction method for the construction of the deep well. After excavating a certain depth each time, construct the shaft wall of this excavation section until excavating to the elevation where the first bottom plate is located, and then construct the shaft wall and the first bottom plate of this section to complete the construction of the deep well; S3, after the construction of the shaft main body is completed, use the shallow well as the construction passage for the high tunnel to carry out the construction of the high tunnel; use the deep well as the construction passage for the low tunnel to carry out the construction of the low tunnel.

[0004] The first bottom plate is arranged below the elevation of the low tunnel, the second bottom plate is arranged below the elevation of the high tunnel, and the second bottom plate is higher than the elevation of the low tunnel.

[0005] The bracing plate is of a flat plate structure, the bottom of the bracing plate is arranged on the second bottom plate, and the top of the bracing plate is flush with the top surface of the shaft body.

[0006] The bracing plate is arranged vertically downward along the symmetry center of the top surface of the shaft body, and the bottom of the bracing plate is arranged at the inner edge of the second bottom plate.

[0007] The deep well below the bracing plate is of a cylindrical structure.

[0008] The shaft construction method for meeting the construction of tunnels at different elevations provided by the present invention adopts the method of arranging the deep well and the shallow well in parallel, reducing the investment in shaft excavation; the above-mentioned deep well is connected to the low tunnel, and the shallow well is connected to the high tunnel, which can meet the needs of daily muck removal, material and equipment transportation of the tunnel. At the same time, since the deep well and the shallow well are arranged adjacent to each other, common muck removal equipment, hoisting equipment, etc. can be used, further reducing the project construction investment and facilitating construction management. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a schematic structural view of the present invention.

[0010] Figure 2 is Figure 1 the A-A sectional view in

[0011] Figure 3 is Figure 1 the B-B sectional view in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings. The embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation manners and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0013] As Figures 1-3 shown, the shaft construction method for meeting the construction of tunnels at different elevations according to the present invention is suitable for a shaft body extending downward from the ground. The shaft body is divided into a deep well 1 and a shallow well 2 arranged in parallel. The deep well 1 is arranged close to the low tunnel 3, and the shallow well 2 is arranged close to the high tunnel 4. A first opening 5 communicating with the low tunnel 3 is arranged on the side wall of the deep well 1, and a second opening 6 communicating with the high tunnel 4 is arranged on the side wall of the shallow well 2.

[0014] The above-mentioned deep well 1 and shallow well 2 can share a set of hoisting and muck removal equipment. The daily muck removal, material and equipment transportation of the low tunnel 3 and the daily muck removal, material and equipment transportation of the high tunnel 4 can be carried out alternately, which not only reduces the equipment investment but also ensures the smooth progress of the construction.

[0015] The bottom of the above-mentioned deep well 1 is the first bottom plate 7, and the bottom of the shallow well 2 is the second bottom plate 8. The first bottom plate 7 is set lower than the elevation of the low tunnel 3, and the second bottom plate 8 is set lower than the elevation of the high tunnel 4, and the second bottom plate 8 is higher than the elevation of the low tunnel 3. The main body of the vertical shaft is excavated in sections above the second bottom plate 8. Every time a certain depth is excavated, the construction of the bracing plate 9 is carried out until the elevation of the second bottom plate 8 is reached. At this time, the bottom of the bracing plate 9 is set on the second bottom plate 8. Then, continue to excavate downward on one side of the bracing plate 9 until the elevation of the first bottom plate 7 is reached. It can be seen that except for the different excavation elevations, the deep well 1 and the shallow well 2 are mainly separated by the bracing plate 9. The above-mentioned bracing plate 9 usually adopts a concrete slab structure, with the bottom set on the second bottom plate 8 and the top flush with the top surface of the main body of the vertical shaft. In addition to separating the deep well 1 and the shallow well 2, it also plays a supporting role for the main body of the vertical shaft to improve the overall stability of the main body of the vertical shaft. In this embodiment, the shaft wall of the main body of the vertical shaft includes two equal-length straight segments and two symmetrically arranged semi-circular arc segments. The bracing plate 9 is arranged vertically downward along the symmetry center of the main body of the vertical shaft, that is, the top is set at the center of the straight segment on the top surface of the main body of the vertical shaft, and the bottom is set at the inner edge of the second bottom plate 8, so as to symmetrically separate the deep well 1 and the shallow well 2 where the bracing plate 9 is located. Further, chamfer structures are respectively arranged at the joints of the ends of the bracing plate 9 and the two straight segments of the shaft wall to improve the supporting performance of the bracing plate 9. The deep well below the above-mentioned bracing plate 9 adopts a cylindrical structure that is easy to excavate, and its projection is tangent to the bracing plate 9.

[0016] After the construction of the main body of the vertical shaft is completed, a first opening 5 is opened on the side wall of the deep well 1, and the first opening 5 is connected to the low tunnel 3 in a penetrating manner, so that the deep well 1 serves as a construction passage for the low tunnel 3. A second opening 6 is opened on the side wall of the shallow well 2, and the second opening 6 is connected to the high tunnel 4 in a penetrating manner, so that the shallow well 2 serves as a construction passage for the high tunnel 4.

[0017] The vertical shaft construction method for meeting the construction of tunnels at different elevations according to the present invention includes the following steps: S1, adopt the top-down construction method, excavate downward in sections from the ground, and complete the construction of the shaft wall and the bracing plate 9 of the excavated section before the start of the next excavation work. When excavating to the elevation where the second bottom plate 8 is located, first carry out the construction of the shaft wall and the bracing plate 9 of this section, and then carry out the construction of the second bottom plate 8, so as to complete the construction of the shallow well 2; After the construction of the second bottom plate 8 in S2, the construction of the deep well 1 continues to be carried out by the top-down method. After excavating a certain depth (usually 2 meters) each time, the construction of the well wall of the excavated section is carried out until the elevation where the first bottom plate 7 is located is reached, and then the construction of the well wall and the first bottom plate 7 of this section is carried out, thus completing the construction of the deep well 1. In S3, after the construction of the main body of the shaft is completed, the shallow well 2 is used as the construction passage for the high tunnel 4 to carry out the construction of the high tunnel 4; the deep well 1 is used as the construction passage for the low tunnel 3 to carry out the construction of the low tunnel 3.

[0018] The present invention uses a single shaft to meet the construction requirements of tunnels at different elevations. The above-mentioned method of parallel excavation of deep wells and shallow wells not only facilitates construction management but also reduces project investment, and is very suitable for the shaft construction of shallow-buried tunnels with different elevation soil masses.

[0019] It should be noted that in the description of the present invention, terms indicating orientation or positional relationships such as "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientation 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 thus cannot be construed as a limitation of the present invention.

Claims

1. A shaft construction method for meeting the construction of tunnels at different elevations, which is suitable for a shaft main body extending downward from the ground, and is characterized in that: The shaft main body includes a deep well and a shallow well arranged in parallel. The deep well is arranged close to the side of the lower tunnel, and the shallow well is arranged close to the side of the higher tunnel. The deep well and the shallow well are separated by a bracing plate. A first bottom plate is arranged at the bottom of the deep well, and a second bottom plate is arranged at the bottom of the shallow well. A first opening communicating with the lower tunnel is arranged on the side wall of the deep well, and a second opening communicating with the higher tunnel is arranged on the side wall of the shallow well; The construction method includes the following steps: S1. The inverse construction method is adopted. Excavation is carried out in sections downward from the ground, and before the start of the next excavation operation, the construction of the shaft wall and the bracing plate of the excavated section is completed. When excavating to the elevation where the second bottom plate is located, first carry out the construction of the shaft wall and the bracing plate of this section, and then carry out the construction of the second bottom plate to complete the construction of the shallow well; S2. After the construction of the second bottom plate is completed, continue to use the inverse construction method to construct the deep well. After each excavation to a certain depth, carry out the construction of the shaft wall of this excavation section until excavating to the elevation where the first bottom plate is located, and then carry out the construction of the shaft wall and the first bottom plate of this section to complete the construction of the deep well; S3. After the construction of the shaft main body is completed, use the shallow well as the construction passage for the higher tunnel to carry out the construction of the higher tunnel; use the deep well as the construction passage for the lower tunnel to carry out the construction of the lower tunnel.

2. The shaft construction method for meeting the construction of tunnels with different elevations according to claim 1, characterized in that: The first bottom plate is arranged below the elevation of the lower tunnel, the second bottom plate is arranged below the elevation of the higher tunnel, and the second bottom plate is higher than the elevation of the lower tunnel.

3. The shaft construction method for meeting the construction of tunnels with different elevations according to claim 2, wherein: The bracing plate is of a flat plate structure, and the bottom of the bracing plate is arranged on the second bottom plate, and the top of the bracing plate is flush with the top surface of the shaft main body.

4. The shaft construction method for meeting the construction of tunnels with different elevations according to claim 3, characterized in that: The bracing plate is arranged vertically downward along the symmetry center of the top surface of the shaft main body, and the bottom of the bracing plate is arranged at the inner edge of the second bottom plate.

5. The shaft construction method for meeting the construction of tunnels with different elevations according to claim 3, characterized in that: The deep well below the bracing plate is of a cylindrical structure.

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