Cooperative construction method for vertical shaft subsection SBE tunneling and adit upper bending section excavation

Abstract

The invention discloses a collaborative construction method for vertical shaft subsection SBE tunneling and adit upward bending section excavation, and belongs to the technical field of pumped storage power station construction. The method comprises the following steps: step 1, determining an SBE tunneling sub-section; secondly, hovering points are arranged in the vertical shaft; thirdly, a positioning hole and a pilot shaft are constructed in the center of the vertical shaft in sequence to be communicated with an existing roadway or tunnel on the lower side of the vertical shaft; 4, the vertical shaft is excavated to an SBE tunneling section from top to bottom through the SBE in an expanding mode, and then the SBE is lifted to a hovering point; 5, slag slipping is conducted through the pilot shaft, and integrated layered blasting excavation is conducted on the upper adit reserved rock plug, the adit upper bent section and the vertical shaft within the height range of the adit upper bent section; sixthly, a simplified starting well is constructed; and 7, the SBE is lowered to complete expanding excavation operation of the remaining part of the vertical shaft. The defects existing in the prior art are fundamentally overcome, collaborative excavation construction of the adit upper bent section and the vertical shaft is achieved, and the SBE expanding excavation raise boring well guide method is deepened and developed.

Description

Technical Field

[0001] This invention relates to a collaborative construction method for segmented SBE tunneling of vertical shafts and excavation of the upper curved section of horizontal tunnels, belonging to the field of pumped storage power station construction technology. Background Technology

[0002] Currently, several pumped storage power stations have applied the key technology of deep shaft excavation, "mechanical (SBE) enlargement and reverse drilling guide shaft method", to excavate the shaft to the bottom in one go. Specifically, the positioning hole is first constructed using directional drilling, then the hole is enlarged using reverse drilling to form a guide shaft, and finally the full-section forward enlargement is carried out to the bottom using a variable diameter enlargement shaft tunneling machine (SBE). Next, the junction of the upper horizontal tunnel and the vertical shaft is excavated using the drill-and-blast method to deal with the reserved rock blockage section of the horizontal tunnel and the upper bend section.

[0003] However, the above construction method has the following drawbacks: First, it is difficult to achieve coordinated construction: it is impossible to achieve coordinated excavation of the vertical shaft and the upper curved section of the horizontal tunnel at the junction of the vertical shaft and the upper horizontal tunnel, which makes the subsequent construction of the upper curved section of the horizontal tunnel more difficult. Secondly, it will cause damage to the shaft wall and support: When excavating the upper bend section of the horizontal tunnel where the shaft and the upper horizontal tunnel meet, most of the detached stone debris will fall along the shaft, causing damage to the shaft wall and support. Third, there are significant safety risks: Since the vertical shaft has already been excavated and formed, the upper bend of the horizontal tunnel at the junction of the vertical shaft and the upper horizontal tunnel will form a "cliff" in the air. When excavating the upper bend of the horizontal tunnel, a special plan must be designed to deal with the vertical transportation of personnel, explosives, drilling equipment, etc. in the deep well, as well as the chimney effect of the vertical shaft in the limited space and the high-altitude operation in the deep well. There are many potential hazards and significant safety risks. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a collaborative construction method for segmented SBE excavation of vertical shafts and excavation of the upper curved section of horizontal tunnels.

[0005] This invention is achieved through the following technical solution: A collaborative construction method for segmented SBE excavation of vertical shafts and excavation of the upper bend section of horizontal tunnels includes the following steps: Step 1: Determine the SBE tunneling section; Step 2: Set up a hovering point inside the shaft, with the hovering point located above the SBE tunneling section; Step 3: Construct positioning holes and guide shafts at the center of the shaft to connect with the existing roadway or tunnel below the shaft. Step 4: Using the SBE, the shaft is enlarged from top to bottom to the SBE excavation section, and then the SBE is lifted to the hovering point; Step 5: Use the pilot shaft to chute the slag and blast the reserved rock plug of the upper horizontal tunnel to make it connected with the vertical shaft. Then, use the SBE tunneling section as the working platform to carry out integrated layered blasting excavation of the upper curved section of the horizontal tunnel at the junction of the upper horizontal tunnel and the vertical shaft, as well as the vertical shaft within the height range of the upper curved section of the horizontal tunnel. Step 6: Construct a simplified launching shaft from top to bottom on the annular bottom surface of the vertical shaft; Step 7: Lower the SBE to complete the remaining excavation work of the shaft.

[0006] In step one, the elevation of the bottom plate of the upper flat tunnel is determined as the SBE tunneling section.

[0007] In step two, the distance from the hovering point to the SBE excavation section is determined by combining the reserved rock plug in the upper tunnel, the blasting excavation scheme of the upper bend section of the tunnel and the vertical shaft, and the surrounding rock geological conditions at the junction of the vertical shaft and the upper tunnel.

[0008] Step three includes the following steps: Step A: Use directional drilling to construct a positioning hole from top to bottom at the center of the shaft until the positioning hole is connected to the existing roadway or tunnel below the shaft. Step B: Use a reverse drilling tool to enlarge the positioning hole from bottom to top to form a pilot well.

[0009] In step four, after the SBE is raised to the hovering point, it is stabilized and hovered, and its support shoe is firmly fixed to the inner wall of the shaft.

[0010] In step four, after raising the SBE to the hovering point, a temporary safety monitoring point is set up at the hovering point.

[0011] After the completion of step five, the elevation of the annular bottom surface of the vertical shaft is consistent with the bottom elevation of the upper curved section of the horizontal tunnel.

[0012] During step five of the construction process, slag is removed through the existing roadway or tunnel below the shaft.

[0013] In step six, the simplification of the excavation height of the starting well is based on the ability to form the SBE support shoe's traction point.

[0014] In step six, the artificial wellbore method is used to construct a simplified launching well.

[0015] The beneficial effects of this invention are as follows: First, by setting up an SBE excavation section at the junction of the vertical shaft and the upper horizontal tunnel, the deep vertical shaft SBE full-section excavation to the bottom in one go is changed to segmented secondary expansion excavation. This allows the vertical shaft within the height range of the upper curved section of the horizontal tunnel to be excavated in an integrated layered blasting manner, realizing the coordinated excavation construction of the upper curved section of the horizontal tunnel and the vertical shaft, and significantly reducing the construction difficulty of the upper curved section of the horizontal tunnel.

[0016] Secondly, during the blasting and excavation of the vertical shaft within the height range of the upper bend section of the tunnel and the reserved rock plug in the upper flat tunnel, the shaft wall and support will not be damaged because the guide shaft is used for muck removal.

[0017] Third, because the SBE tunneling section was set up and the deep vertical shaft SBE full-section tunneling was excavated to the bottom in one go, it was changed to segmented secondary expansion tunneling. Therefore, the SBE tunneling section can be used as a working platform to carry out integrated layered blasting excavation of the upper bend section of the horizontal tunnel and the vertical shaft within the height range of the upper bend section of the horizontal tunnel. This avoids the safety hazards of "cliff" construction in the shaft and helps to improve construction efficiency.

[0018] Fourth, it fundamentally solves the shortcomings of existing technologies, realizes the coordinated excavation of the upper curve section of the horizontal tunnel and the vertical shaft, ends the status quo that the SBE expansion excavation could not achieve the coordinated excavation of the upper curve section of the horizontal tunnel and the vertical shaft, deepens and develops the SBE expansion excavation reverse drilling guide shaft method, and improves the key technology system for the construction of vertical shafts of pumped storage power stations. Attached Figure Description

[0019] Figure 1 This is a flowchart illustrating the construction process of the present invention. Figure 2 This is a schematic diagram of the structure when the SBE is raised to the hovering point according to the present invention; Figure 3 This is a schematic diagram of the structure when the SBE is lowered into the simplified launch well according to the present invention.

[0020] In the diagram: 1-Vertical shaft, 2-Hovering point, 3-Pilot shaft, 4-SBE, 5-Upper horizontal tunnel, 6-Upper bend of horizontal tunnel, 7-Simplified launching shaft. Detailed Implementation

[0021] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0022] like Figures 1 to 3 As shown, the collaborative construction method for segmented SBE excavation of vertical shafts and excavation of the upper bend section of horizontal tunnels according to the present invention includes the following steps: Step 1: Determine the SBE tunneling section.

[0023] Step 2: Set up hovering point 2 inside shaft 1, with hovering point 2 located above the SBE tunneling section.

[0024] Step 3: Construct positioning holes and guide shaft 3 at the center of shaft 1 to connect with the existing roadway or tunnel below shaft 1.

[0025] Step 4: Using SBE4, expand shaft 1 from top to bottom to the SBE excavation section, and then lift SBE4 to hovering point 2.

[0026] Step 5: Use the pilot shaft 3 to chute the slag and blast the reserved rock plug of the upper horizontal tunnel 5 to make it connected with the vertical shaft 1. Then, use the SBE tunneling section as the working platform to carry out integrated layered blasting excavation of the upper curved section 6 of the horizontal tunnel at the junction of the upper horizontal tunnel 5 and the vertical shaft 1, as well as the vertical shaft 1 within the height range of the upper curved section 6 of the horizontal tunnel.

[0027] Step 6: Construct the simplified starting shaft 7 from top to bottom on the annular bottom surface of shaft 1.

[0028] Step 7: Lower SBE4 to complete the remaining excavation work of shaft 1.

[0029] Specifically, this invention provides a collaborative construction method for segmented SBE tunneling of vertical shafts and excavation of the upper bend section of horizontal tunnels, which has the following technical effects: First, by setting up an SBE excavation section at the junction of shaft 1 and upper horizontal tunnel 5, the deep shaft SBE full-section excavation to the bottom in one go is changed to segmented secondary expansion excavation. This allows shaft 1 within the height range of the upper curved section 6 of the horizontal tunnel and shaft 1 to be excavated in an integrated layered blasting manner, realizing the coordinated excavation of the upper curved section 6 of the horizontal tunnel and shaft 1, and significantly reducing the construction difficulty of the upper curved section 6 of the horizontal tunnel.

[0030] Secondly, during the blasting excavation of vertical shaft 1 within the height range of the upper bend section 6 of the tunnel and the reserved rock plug in the upper flat tunnel 5, the shaft wall and support of vertical shaft 1 will not be damaged because the guide shaft 3 is used for slag removal.

[0031] Third, because the SBE tunneling section was set up and the deep vertical shaft SBE full-section tunneling was changed to a segmented secondary expansion tunneling, the SBE tunneling section can be used as a working platform to carry out integrated layered blasting excavation of the upper bend section 6 of the horizontal tunnel and the vertical shaft 1 within the height range of the upper bend section 6 of the horizontal tunnel. This avoids the safety hazards of "cliff" construction inside the shaft and helps to improve construction efficiency.

[0032] Fourth, it fundamentally solves the shortcomings of existing technologies, realizes the coordinated excavation of the upper bend section 6 of the horizontal tunnel and the vertical shaft 1, ends the status quo that the SBE expansion excavation could not achieve the coordinated excavation of the upper bend section 6 of the horizontal tunnel and the vertical shaft 1, deepens and develops the SBE expansion excavation reverse drilling guide well method, and improves the key technology system for the construction of the vertical shaft 1 of the pumped storage power station.

[0033] In step one, the elevation position of the bottom plate of the upper flat tunnel 5 is determined as the SBE tunneling section.

[0034] In step two, the distance from the suspension point 2 to the SBE excavation section is determined by combining the blasting excavation plan for the pre-reserved rock plug in the upper tunnel 5, the upper bend section 6 of the tunnel, and the vertical shaft 1, as well as the surrounding rock geological conditions at the junction of the vertical shaft 1 and the upper tunnel 5. It is necessary to ensure that after SBE4 is raised to the suspension point 2, SBE4 is largely unaffected by the blasting construction of the pre-reserved rock plug in the upper tunnel 5, the integrated layered blasting construction of the upper bend section 6 of the tunnel, and the vertical shaft 1 within the height range of the upper bend section 6.

[0035] Step three includes the following steps: Step A: Use directional drilling to construct a positioning hole from top to bottom at the center of shaft 1 until the positioning hole is connected to the existing roadway or tunnel below shaft 1. Step B: Use a reverse drilling tool to enlarge the positioning hole from bottom to top to form a pilot well 3.

[0036] In step four, after SBE4 is raised to hovering point 2, SBE4 is stabilized and hovered, and its support shoe is tightly fixed to the inner wall of shaft 1.

[0037] In step four, after raising SBE4 to hovering point 2, a temporary safety monitoring point is set up at hovering point 2.

[0038] After the completion of step five, the elevation of the annular bottom surface of shaft 1 is consistent with the bottom surface elevation of the upper curved section 6 of the horizontal tunnel.

[0039] During step five of the construction, slag is removed through the existing roadway or tunnel below shaft 1.

[0040] In step six, the excavation height of the starting well 7 is simplified to ensure that the SBE4 support shoe can be formed.

[0041] In step six, a simplified launching well 7 is constructed using the manual wellbore method. The purpose of constructing the simplified launching well 7 is to ensure that SBE4 meets the conditions for restarting operations.

Claims

1. A collaborative construction method for segmented SBE excavation of vertical shafts and excavation of the upper bend section of horizontal tunnels, characterized in that: Includes the following steps: Step 1: Determine the SBE tunneling section; Step 2: Set up a hovering point (2) inside the shaft (1), and the hovering point (2) is located above the SBE tunneling section; Step 3: Construct positioning holes and guide shafts (3) at the center of the vertical shaft (1) to connect with the existing roadway or tunnel below the vertical shaft (1); Step 4: Using SBE (4), the shaft (1) is expanded from top to bottom to the SBE excavation section, and then SBE (4) is lifted to the hovering point (2). Step 5: Use the pilot shaft (3) to sluice the slag and blast the reserved rock plug of the upper horizontal tunnel (5) to make it connected with the vertical shaft (1). Then, use the SBE tunneling section as the working platform to carry out integrated layered blasting excavation of the upper bend section (6) of the horizontal tunnel at the junction of the upper horizontal tunnel (5) and the vertical shaft (1), and the vertical shaft (1) within the height range of the upper bend section (6). Step 6: Construct a simplified starting shaft (7) from top to bottom on the annular bottom surface of the vertical shaft (1). Step 7: Lower the SBE (4) to complete the remaining excavation work of the shaft (1).

2. The collaborative construction method for segmented SBE excavation of vertical shafts and excavation of the upper bend section of horizontal tunnels as described in claim 1, characterized in that: In step one, the elevation position of the bottom plate of the upper flat tunnel (5) is determined as the SBE tunneling section.

3. The collaborative construction method for segmented SBE excavation of vertical shafts and excavation of the upper bend section of horizontal tunnels as described in claim 1, characterized in that: In step two, the distance from the suspension point (2) to the SBE excavation section is determined by combining the reserved rock plug of the upper flat tunnel (5), the upper bend section (6) of the flat tunnel and the blasting excavation scheme of the vertical shaft (1), and the surrounding rock geological conditions at the junction of the vertical shaft (1) and the upper flat tunnel (5).

4. The collaborative construction method for segmented SBE excavation of vertical shafts and excavation of the upper bend section of horizontal tunnels as described in claim 1, characterized in that: Step three includes the following steps: Step A: Use directional drilling to construct a positioning hole from top to bottom at the center of the shaft (1) until the positioning hole is connected to the existing roadway or tunnel below the shaft (1); Step B: Use a reverse drilling tool to enlarge the positioning hole from bottom to top to form a pilot well (3).

5. The collaborative construction method for segmented SBE excavation of vertical shafts and excavation of the upper bend section of horizontal tunnels as described in claim 1, characterized in that: In step four, after raising SBE (4) to the hovering point (2), SBE (4) is hovered and stabilized, and its support shoe is pressed tightly against the inner wall of the shaft (1).

6. The collaborative construction method for segmented SBE excavation of vertical shafts and excavation of the upper bend section of horizontal tunnels as described in claim 1, characterized in that: In step four, after raising the SBE (4) to the hovering point (2), a temporary safety monitoring point is set up at the hovering point (2).

7. The collaborative construction method for segmented SBE excavation of vertical shafts and excavation of the upper bend section of horizontal tunnels as described in claim 1, characterized in that: After the completion of step five, the elevation of the annular bottom surface of the vertical shaft (1) is consistent with the bottom elevation of the upper curved section (6) of the horizontal tunnel.

8. The collaborative construction method for segmented SBE excavation of vertical shafts and excavation of the upper bend section of horizontal tunnels as described in claim 1, characterized in that: During step five of the construction, slag is removed through the existing roadway or tunnel below the shaft (1).

9. The collaborative construction method for segmented SBE excavation of vertical shafts and excavation of the upper bend section of horizontal tunnels as described in claim 1, characterized in that: In step six, the simplification of the excavation height of the starting well (7) is based on the ability to form the support point of the SBE (4) support shoe.

10. The method for coordinated construction of vertical shaft segmented SBE excavation and horizontal tunnel upbend excavation as described in claim 1, characterized in that: In step six, the artificial wellhead method is used to construct a simplified launching well (7).

Images