Construction method of shield launching well serving as mining method tunnel construction channel

Abstract

The invention discloses a construction method of a shield launching shaft concurrently serving as a mining method tunnel construction channel, which comprises the following steps: S1, firstly constructing an underground diaphragm wall, then constructing a top layer waist beam and a diagonal beam, then excavating an underground diaphragm wall vertical shaft from the earth surface, and constructing a second layer waist beam and a diagonal beam after reaching the elevation of the second layer waist beam and the diagonal beam, after construction of the waist beams and the diagonal beams of the last layer is completed according to the method, downward excavation is conducted to the bottom plate elevation of the diaphragm wall vertical shaft, and the side walls and the first bottom plate are constructed; s2, after shield launching is completed, a reverse building method is adopted for constructing the upside-down wall vertical shaft, and the upside-down wall vertical shaft is excavated in a segmented mode and constructed till construction of a second bottom plate is completed; and S3, after construction of the upside-down wall vertical shaft is completed, shield tunnel tunneling construction is conducted through the underground diaphragm wall vertical shaft, and mining method tunnel construction is conducted through the upside-down wall vertical shaft. According to the invention, the requirements of shield launching, shield tunnel construction and underlying mining method tunnel construction can be met at the same time, the construction cost is low, the occupied area is small, and the construction management is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy and hydropower engineering tunnel construction, in particular to a construction method of a shield launching shaft serving as a mining tunnel construction channel. Background Art

[0002] With the rapid development of society and economy, the number of water diversion tunnel projects in my country has gradually increased. Under some complex geological conditions, the mining method and shield tunneling method can be used simultaneously for construction. Specifically, under soft soil or soft rock conditions, the shield tunneling method is used to achieve continuous excavation; when it is necessary to cross hard rock areas or there are other conditions that are not conducive to shield construction, the mining method is used to excavate a tunnel section, thereby improving overall construction efficiency. However, sometimes, in order to avoid buildings or avoid unfavorable geological zones, it is necessary to lower part of the mining method tunnel. At this time, it is necessary to consider how to set up the construction shaft to smoothly transport equipment, materials, and slag while meeting the construction economy. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a low-investment, safe and reliable method for constructing a shield launching shaft that also serves as a mining tunnel construction channel. Specifically, the following technical solutions can be adopted: The method for constructing a shield launching shaft that also serves as a tunnel construction passage for a mining method according to the present invention is suitable for the following shield launching shaft, which includes a ground-connected wall vertical shaft connected to the shield tunnel, the ground-connected wall vertical shaft including an underground continuous wall enclosing a quadrilateral, a side wall provided at the lower portion of the underground continuous wall, a first bottom plate provided at the bottom of the side wall, a plurality of sets of waist beams provided above the side wall, and a plurality of supporting beams provided between the waist beams; an inverted wall vertical shaft extending downward is provided on the first bottom plate, the inverted wall vertical shaft consisting of an inverted shaft wall and a second bottom plate, the inverted shaft wall being connected to the underlying tunnel; The construction method comprises the following steps: S1: First, construct the underground continuous wall, then construct the top-level waist beam and supporting beams. After completion, start excavating the diaphragm wall shaft from the ground surface. After excavating to the elevation of the second-level waist beam and supporting beams, construct the second-level waist beam and supporting beams. After completing the construction of the last layer of waist beams and supporting beams according to the above method, excavate downward to the bottom plate elevation of the diaphragm wall shaft and construct the side walls and the first bottom plate. S2: After the shield tunneling is started using the underground continuous wall shaft, the inverted wall shaft is constructed using the reverse method. The inverted wall shaft is excavated in sections. After each excavation depth is reached, the inverted shaft wall is constructed until the bottom plate elevation of the inverted wall shaft is reached, completing the construction of the second bottom plate. S3, after the construction of the inverted wall shaft is completed, the shield tunnel excavation construction is carried out using the ground-connected wall shaft, and the mining method tunnel construction is carried out using the inverted wall shaft.

[0004] The ground-connected wall shaft is a rectangular structure that meets the assembly and starting requirements of the shield machine.

[0005] The bottom of the underground continuous wall extends to below the first bottom plate and is located above the underlying tunnel.

[0006] The underground continuous wall and the side wall are provided with a first opening connected to the shield tunnel.

[0007] The waist beam and the supporting beam are both located above the shield tunnel.

[0008] The ends of the supporting beams are provided with reinforcing ribs connected to the waist beams.

[0009] The top of the inverted shaft wall is provided with an outer flange structure connected to the first bottom plate, and the inverted shaft wall is connected to the underlying tunnel through a second opening.

[0010] The cross section of the inverted wall shaft is a circular structure.

[0011] The underlying tunnel is a tunnel constructed using the mining method.

[0012] The present invention provides a method for constructing a shield launch shaft that also serves as a tunnel construction channel for a mining method. This method utilizes a ground-connected wall shaft to meet the requirements for shield launch and shield tunnel construction. Furthermore, an inverted wall shaft is provided below the ground-connected wall shaft to meet the construction requirements of the underlying mining method tunnel. The inverted wall shaft extends downward from the floor of the ground-connected wall shaft, reducing not only the overall shaft footprint but also the total shaft excavation effort and overall construction costs. Furthermore, the inverted wall shaft and the ground-connected wall shaft can share slag discharge equipment, hoisting equipment, and other equipment, further reducing project construction investment and facilitating construction management. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the shield launching shaft described in the present invention.

[0014] Figure 2 yes Figure 1 AA view in .

[0015] Figure 3 yes Figure 1 BB view in . DETAILED DESCRIPTION

[0016] The following describes an embodiment of the present invention in detail with reference to the accompanying drawings. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process. However, the protection scope of the present invention is not limited to the following embodiment.

[0017] like Figure 1-3 As shown, the construction method of the shield starting shaft serving as a mining tunnel construction channel described in the present invention is suitable for the following shield starting shaft, which includes a ground-connected wall shaft 2 connected to the shield tunnel 1.

[0018] To meet the requirements for shield machine assembly and launch, as well as construction slag removal and material transportation, the diaphragm wall shaft 2 adopts a rectangular structure. The diaphragm wall shaft 2 is excavated by an excavator. To maintain structural stability, a quadrilateral underground continuous wall 3 is installed along the shaft wall. The underground continuous wall 3 extends below the floor of the diaphragm wall shaft 2 (i.e., below the first floor 4). Side walls 5 are installed near the bottom of the inner side of the underground continuous wall 3. The bottom of the side wall 5 is connected to the first floor 4. Multiple sets of waist beams 6 are installed above the side walls 5, and multiple bracing beams 7 are installed between the waist beams 6. In this embodiment, the waist beams 6 and bracing beams 7 are both located above the shield tunnel 1. The bracing beams 7 are arranged in three layers from top to bottom, with two beams arranged side by side on each layer, dividing the diaphragm wall shaft 2 into three lifting holes. Each bracing beam 7 is equipped with a reinforcing rib 8 at the end that connects to the waist beam 6, further enhancing the stability of the overall structure. A first opening 9 is formed through the underground continuous wall 3 and the side wall 5 for connecting with the shield tunnel 1 .

[0019] The tunnel constructed by the mining method (i.e., the lower tunnel 10) is located below the underground continuous wall 3 of the ground-connected wall shaft 2. An inverted wall shaft 11 is provided below the ground-connected wall shaft 2 to meet the needs of slag discharge, material transportation, etc. for the construction of the lower tunnel 10. Specifically, a circular hole is opened on the first bottom plate 4 of the ground-connected wall shaft 2 for excavating downward and building the inverted wall shaft 11. The inverted wall shaft 11 is composed of an inverted shaft wall 12 and a second bottom plate 13. The second bottom plate 13 is circular and is located below the lower tunnel 10. An outer flange structure 14 connected to the first bottom plate 4 is provided on the top of the inverted shaft wall 12, and a second opening 15 is opened on the inverted shaft wall 12 near the second bottom plate 13. The second opening 15 is used to connect to the lower tunnel 10.

[0020] The method for constructing a shield launching shaft that also serves as a mining tunnel construction passage according to the present invention comprises the following steps: S1: First, construct the underground continuous wall 3, then construct the top-level waist beam 6 and supporting beam 7. After completion, start excavating the ground-connected wall shaft 2 from the surface. After excavating to the elevation of the second-level waist beam 6 and supporting beam 7, construct the second-level waist beam 6 and supporting beam 7. After completing the construction of the last level of waist beam 6 and supporting beam 7 according to the above method, excavate downward to the bottom plate elevation of the ground-connected wall shaft 2 and construct the side wall 5 and the first bottom plate 4. S2: After the shield tunneling is started using the underground diaphragm wall shaft 2, the inverted wall shaft 11 is constructed using the reverse method. The inverted wall shaft 11 is excavated in sections. After each excavation depth (usually 2 meters) is reached, the inverted shaft wall 12 is constructed until the bottom plate elevation of the inverted wall shaft 11 is reached, completing the construction of the second bottom plate 13. S3, after the construction of the inverted wall shaft 11 is completed, the shield tunnel 1 is excavated using the ground-connected wall shaft 2, and the mining method tunnel (i.e., the underlying tunnel 10) is constructed using the inverted wall shaft 11.

[0021] The above-mentioned ground-connected wall shaft 2 should be dimensioned according to the construction requirements of the shield tunnel 1 to meet the initial needs of the shield tunnel and the needs of subsequent construction materials and equipment operation; while the inverted wall shaft 11 is used to meet the construction requirements of the underlying mining method tunnel.

[0022] The present invention can simultaneously meet the needs of shield starting, shield tunnel construction passage, and underlying mining method tunnel construction passage, which is beneficial to reducing project investment and facilitating construction management. It is particularly suitable for shallow buried earth tunnel construction shafts where shield excavation method and mining method construction are simultaneously used.

[0023] 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”, “inside”, and “outside” are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 a limitation on the present invention.

Claims

1. A method for constructing a shield launching shaft that also serves as a tunnel construction passage for a mining method, characterized by: The shield launching shaft includes a ground-connected wall shaft connected to the shield tunnel, the ground-connected wall shaft includes an underground continuous wall enclosing a quadrilateral, the lower part of the underground continuous wall is provided with a side wall, the bottom of the side wall is provided with a first bottom plate, a plurality of waist beams are provided above the side wall, and a plurality of supporting beams are provided between the waist beams; an inverted wall shaft extending downward is provided on the first bottom plate, the inverted wall shaft is composed of an inverted shaft wall and a second bottom plate, and the inverted shaft wall is connected to the underlying tunnel; The construction method comprises the following steps: S1: First, construct the underground continuous wall, then construct the top-level waist beam and supporting beams. After completion, start excavating the diaphragm wall shaft from the ground surface. After excavating to the elevation of the second-level waist beam and supporting beams, construct the second-level waist beam and supporting beams. After completing the construction of the last layer of waist beams and supporting beams according to the above method, excavate downward to the bottom plate elevation of the diaphragm wall shaft and construct the side walls and the first bottom plate. S2: After the shield tunneling is started using the underground continuous wall shaft, the inverted wall shaft is constructed using the reverse method. The inverted wall shaft is excavated in sections. After each excavation depth is reached, the inverted shaft wall is constructed until the bottom plate elevation of the inverted wall shaft is reached, completing the construction of the second bottom plate. S3, after the construction of the inverted wall shaft is completed, the shield tunnel excavation construction is carried out using the ground-connected wall shaft, and the mining method tunnel construction is carried out using the inverted wall shaft.

2. The method for constructing a shield launching shaft serving as a tunnel construction passage for a mining method according to claim 1, characterized in that: The ground-connected wall shaft is a rectangular structure that meets the assembly and starting requirements of the shield machine.

3. The method for constructing a shield launching shaft serving as a tunnel construction passage for a mining method according to claim 1, characterized in that: The bottom of the underground continuous wall extends to below the first bottom plate and is located above the underlying tunnel.

4. The method for constructing a shield launching shaft serving also as a tunnel construction passage for a mining method according to claim 1, characterized in that: The underground continuous wall and the side wall are provided with a first opening connected to the shield tunnel.

5. The method for constructing a shield launching shaft serving as a tunnel construction passage for a mining method according to claim 1, characterized in that: The waist beam and the supporting beam are both located above the shield tunnel.

6. The method for constructing a shield launching shaft also serving as a tunnel construction passage for a mining method according to claim 1, characterized in that: The ends of the supporting beams are provided with reinforcing ribs connected to the waist beams.

7. The method for constructing a shield launching shaft also serving as a tunnel construction passage for mining method according to claim 1, characterized in that: The top of the inverted shaft wall is provided with an outer flange structure connected to the first bottom plate, and the inverted shaft wall is connected to the underlying tunnel through a second opening.

8. The method for constructing a shield launching shaft serving as a tunnel construction passage for a mining method according to claim 1, characterized in that: The cross section of the inverted wall shaft is a circular structure.

9. The method for constructing a shield launching shaft serving also as a tunnel construction passage for a mining method according to claim 1, characterized in that: The underlying tunnel is a tunnel constructed using the mining method.

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