A method for protecting an existing tunnel during tunneling with a shield

Abstract

The application discloses a kind of tunnel oblique joint shield and protects existing tunnel guiding construction method, construction method includes: installing guiding support frame at the intersection position of existing tunnel and oblique joint tunnel, make the length direction of guiding support frame and the trend of oblique joint tunnel be located on same straight line, and make the inner diameter of guiding support frame equal the diameter of oblique joint tunnel, utilize guiding support frame to support the side wall of existing tunnel;Under the guidance of guiding support frame, utilize shield machine to excavate the intersection position of oblique joint tunnel and existing tunnel.The advantages of the present application are: in the process of oblique joint tunnel shield tunneling, the safety of existing shield tunnel can be guaranteed;Guiding unit can adapt to different sizes existing shield tunnel, at the same time guiding support frame can guide shield machine tunneling;Guiding inner support hydraulic telescopic rod can adapt to the diameter of shield machine of different sizes oblique joint tunnel;Guiding support frame can adapt to the change of any oblique joint angle formed by proposed shield tunnel and existing shield tunnel.

Description

Technical Field

[0001] This invention relates to the technical field of tunnel construction, and in particular to a method for guiding the construction of an existing tunnel using a shield tunneling machine with inclined sections. Background Technology

[0002] With the increasing demands of my country's economy and people's lives, urban expressways can no longer meet the needs of development, leading to the large-scale construction of shield tunnels, especially in first- and second-tier cities, where urban underground rail transit lines are densely distributed. As my country's urban population grows, existing underground rail transit lines can no longer meet the increasing demand, and many newly planned urban underground rail transit tunnels often need to cross or connect obliquely with existing shield tunnels. In the process of constructing new tunnels that are obliquely connected to shield tunnels, protecting the safety of existing tunnels is extremely important. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of the prior art by providing a method for guiding the construction of an existing tunnel in a tunnel-to-tunnel connection. By installing a guide support frame at the intersection of the existing tunnel and the tunnel to be connected, the tunnel boring machine can be guided to excavate the proposed tunnel, ensuring the safety of the existing tunnel while ensuring the smooth excavation of the tunnel to be connected.

[0004] The objective of this invention is achieved through the following technical solutions: A method for guiding the construction of an existing tunnel using a shield tunneling machine with inclined sections, characterized in that the construction method includes: A guide support frame is installed at the intersection of the existing tunnel and the slanted tunnel, so that the length direction of the guide support frame is on the same straight line as the direction of the slanted tunnel, and the inner diameter of the guide support frame is equal to the diameter of the slanted tunnel, and the guide support frame is used to support the sidewall of the existing tunnel. The guide support frame consists of a guide unit, a movable ball bearing, and a guide inner support unit. The guide unit includes a guide telescopic mechanism and a guide support shoe. The guide support shoes are respectively located on both sides of the guide telescopic mechanism. The shape of the outer side of the guide support shoe corresponds to the shape of the existing tunnel sidewall. The guide telescopic mechanism drives the guide support shoe to support the sidewall of the existing tunnel. The movable ball bearing is provided with a plurality of guide inner support units along its meridian direction. The diameter of the guide support frame is adjusted by the guide inner support units. Guided by the guide support frame, the tunnel boring machine excavates the intersection of the inclined tunnel and the existing tunnel.

[0005] Before the tunnel boring machine excavates the intersection of the inclined tunnel and the existing tunnel, the soil around the intersection of the existing tunnel and the inclined tunnel is reinforced by grouting.

[0006] The guide telescopic mechanism includes an arc-shaped support middle plate, a guide hydraulic cylinder, and an arc-shaped support side plate. Both the arc-shaped support middle plate and the arc-shaped support side plate are circumferentially arranged. The arc-shaped support side plate is provided on both sides of the arc-shaped support middle plate. Both sides of the arc-shaped support middle plate are connected to the corresponding arc-shaped support side plate through the guide hydraulic cylinder.

[0007] The guide support shoe is provided with a guide support shoe pad.

[0008] The arc-shaped support side plate is connected to the guide support shoe via a steel hinge.

[0009] The guide inner support unit includes a guide inner support hydraulic telescopic rod, a guide inner support ball joint, and a spherical sliding support. The fixed end of the guide inner support hydraulic telescopic rod is equipped with the spherical sliding support, and the telescopic end is connected to the corresponding arc support middle plate through the guide inner support ball joint.

[0010] The movable ball joint bearing includes a movable ball joint bearing body, a spherical annular retaining plate, and a spherical sliding groove. The spherical sliding groove is formed between the movable ball joint bearing body and the spherical annular retaining plate. The spherical sliding groove is arranged in a circle along the meridian direction of the movable ball joint bearing. The shape of the spherical sliding support corresponds to the shape of the spherical sliding groove, and the spherical sliding support is engaged in the spherical sliding groove.

[0011] The advantages of this invention are: (1) During the tunnel excavation of inclined shield tunnels, the safety of existing shield tunnels can be guaranteed; (2) The guide unit can adapt to existing shield tunnels of different sizes, and the guide support frame can guide the tunnel boring machine to excavate; (3) The guide internal support hydraulic telescopic rod can adapt to the diameter of the shield machine for tunnels with different sizes of inclined joints; (4) The number of guide units and guide inner support hydraulic telescopic rods can be adjusted as needed; (5) The guide support frame can adapt to any angle change of the oblique connection formed between the proposed shield tunnel and the existing shield tunnel; (6) The guide support frame and the grouting reinforcement of the oblique connection influence range are adopted to further reduce the disturbance of the oblique shield tunnel to the existing shield tunnel and the surrounding rock and soil. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the guide support frame of the present invention; Figure 2 This is a schematic cross-sectional view of the guide support frame of the present invention; Figure 3 for Figure 2 Cross-sectional view of AA in the middle; Figure 4 for Figure 2 Cross-sectional view of BB in the middle; Figure 5 for Figure 2 Cross-sectional view of CC in China; Figure 6 This is a schematic diagram of the connection of the guide inner support unit of the present invention; Figure 7 This is a construction schematic diagram (I) of the guide support frame of the present invention; Figure 8 This is a construction schematic diagram (II) of the guide support frame of the present invention; like Figures 1-8 As shown in the figure, the markings represent: 1. Guiding unit; 2. Movable ball joint bearing; 3. Guiding inner support unit; 4. Existing tunnel; 5. Inclined tunnel; 6. Tunnel boring machine; 7. Guiding support frame; 8. Grouting reinforcement unit; 11. Guide telescopic mechanism; 12. Guide support shoe; 111. Arc support middle plate; 112. Guide hydraulic cylinder; 113. Arc support side plate; 114. Steel hinge; 121. Guide support shoe gasket; 21. Movable ball joint bearing body; 22. Spherical annular retaining plate; 23. Spherical sliding groove; 31. Guide internal support hydraulic telescopic rod, 32. Guide internal support ball joint, 33. Spherical sliding support. Detailed Implementation

[0013] The features and other related features of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate understanding by those skilled in the art: Example: Figures 1-8 As shown, this embodiment relates to a method for guiding the construction of an existing tunnel using a shield tunneling method for inclined tunneling. This construction method mainly includes: A guide support frame 7 is installed at the intersection of the existing tunnel 4 and the inclined tunnel 5, so that the length direction of the guide support frame 7 is on the same straight line as the direction of the inclined tunnel 5, and the inner diameter of the guide support frame 7 is equal to or slightly larger than the diameter of the inclined tunnel 5, so as to support the side wall of the existing tunnel 4.

[0014] Among them, such as Figures 1-6As shown, the guide support frame 7 consists of a guide unit 1, a movable ball bearing 2, and a guide inner support unit 3. The guide unit 1 includes a guide telescopic mechanism 11 and a guide support shoe 12. The guide support shoes 12 are respectively located on both sides of the guide telescopic mechanism 11. The shape of the outer side of the guide support shoe 12 corresponds to the shape of the existing tunnel 4 sidewall. The outer side of the guide support shoe 12 is arc-shaped, and the two ends of the arc are bent inward to fit the existing tunnel 4 sidewall. The guide telescopic mechanism 11 drives the guide support shoe 12 to move closer to or away from the existing tunnel 4 sidewall. A guide support shoe pad 121 is provided on the outer side of the guide support shoe 12, which can play a buffering role to protect the existing tunnel 4 sidewall. The guide telescopic mechanism 11 includes an arc-shaped support middle plate 111, a guide hydraulic cylinder 112, and an arc-shaped support side plate 113. Both the arc-shaped support middle plate 111 and the arc-shaped support side plate 113 are circumferentially arranged. Arc-shaped support side plates 113 are provided on both sides of the arc-shaped support middle plate 111. Both sides of the arc-shaped support middle plate 111 are connected to the corresponding arc-shaped support side plate 113 via the guide hydraulic cylinder 112. The fixed end of the guide hydraulic cylinder 112 is mounted on the arc-shaped support middle plate 111, and the telescopic end is connected to the arc-shaped support side plate 113. The arc-shaped support side plate 111... 3. The guide support shoe 12 is connected to the guide support shoe 12 by steel hinge 114. The guide hydraulic cylinder 112 is driven to move the guide support shoe 12 on the arc support side plate 113. The steel hinge 114 is used to adjust the orientation of the outer side of the guide support shoe 12 so that the guide support shoe 12 (guide support shoe pad 121) fits against the side wall of the existing tunnel 4 so that the guide support frame 7 is supported on the side wall of the existing tunnel 4. In this embodiment, each arc support side plate 113 and each arc support middle plate 111 are connected by two guide hydraulic cylinders 112.

[0015] The movable ball joint bearing 2 has several guide inner support units 3 arranged along its meridian direction, the number of which corresponds to the number of arc support plates 111. Each guide inner support unit 3 includes a guide inner support hydraulic telescopic rod 31, a guide inner support ball joint 32, and a spherical sliding support 33. The fixed end of the guide inner support hydraulic telescopic rod 31 is equipped with a spherical sliding support 23, and the telescopic end is connected to the corresponding arc support plate 111 via the guide inner support ball joint 32. The orientation of the arc support plate 111 can be adjusted via the guide inner support ball joint 32. The movable ball joint bearing 2 includes a movable ball joint bearing body 21, a spherical annular retaining plate 22, and a spherical groove 23. A spherical groove 23 is formed between the movable ball joint bearing body 21 and the spherical annular retaining plate 22. The spherical groove 23 is arranged in a circle along the meridian direction of the movable ball joint bearing 2. The shape of the spherical sliding support 33 corresponds to the shape of the spherical groove 23, and the spherical sliding support 33 is engaged within the spherical groove 23.

[0016] In this embodiment, the position of the arc support plate 111 is adjusted by adjusting the guide inner support ball joint 32 and the guide inner support hydraulic telescopic rod 31, so that the inner diameter of the cylindrical structure formed between the arc support plates 111 is equal to or slightly larger than the diameter of the inclined tunnel 5, which can guide the tunnel boring machine 6 to excavate; the position of the guide support shoe 12 is adjusted by adjusting the steel hinge 114 and the guide hydraulic cylinder 112, so that the guide support shoe 12 fits and supports the side wall of the existing tunnel 4, which can support existing tunnels 4 of different sizes.

[0017] like Figure 7 As shown, guided by the guide support frame 7, the tunnel boring machine 6 excavates the intersection of the inclined tunnel 5 and the existing tunnel 4. Furthermore, as... Figure 8 As shown, before the tunnel boring machine 6 excavates the intersection of the inclined tunnel 5 and the existing tunnel 4, the soil around the intersection of the existing tunnel 4 and the inclined tunnel 5 is reinforced by grouting to form a grouting reinforced body 8, thereby reducing the disturbance of the tunnel boring machine 6 to the existing tunnel 4 and the surrounding rock and soil.

[0018] The beneficial technical effects of this embodiment are as follows: (1) During the tunnel excavation of inclined shield tunnels, the safety of existing shield tunnels can be guaranteed; (2) The guide unit can adapt to existing shield tunnels of different sizes, and the guide support frame can guide the tunnel boring machine to excavate; (3) The guide internal support hydraulic telescopic rod can adapt to the diameter of the shield machine for tunnels with different sizes of inclined joints; (4) The number of guide units and guide inner support hydraulic telescopic rods can be adjusted as needed; (5) The guide support frame can adapt to any angle change of the oblique connection formed between the proposed shield tunnel and the existing shield tunnel; (6) The guide support frame and the grouting reinforcement of the oblique connection influence range are adopted to further reduce the disturbance of the oblique shield tunnel to the existing shield tunnel and the surrounding rock and soil.

[0019] Although the above embodiments have described the concept and embodiments of the present invention in detail with reference to the accompanying drawings, those skilled in the art will recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, and therefore will not be elaborated here.

Claims

1. A method for protecting an existing tunnel during tunneling with a slanting shield, characterized in that The construction method includes: installing a guide support frame at the intersection of the existing tunnel and the inclined tunnel, such that the length direction of the guide support frame is on the same straight line as the direction of the inclined tunnel, and the inner diameter of the guide support frame is equal to the diameter of the inclined tunnel, and using the guide support frame to support the sidewall of the existing tunnel. The guide support frame consists of a guide unit, a movable ball bearing, and a guide inner support unit. The guide unit includes a guide telescopic mechanism and a guide support shoe. The guide support shoes are respectively located on both sides of the guide telescopic mechanism. The shape of the outer side of the guide support shoe corresponds to the shape of the existing tunnel sidewall. The guide telescopic mechanism drives the guide support shoe to support the sidewall of the existing tunnel. The movable ball bearing has a plurality of guide inner support units arranged radially thereon. The diameter of the guide support frame is adjusted by the guide inner support units. Guided by the guide support frame, the tunnel boring machine is used to excavate the intersection of the inclined tunnel and the existing tunnel; The guide telescopic mechanism includes an arc-shaped support middle plate, a guide hydraulic cylinder, and an arc-shaped support side plate. The arc-shaped support middle plate and the arc-shaped support side plate are both circumferentially arranged. The arc-shaped support side plate is provided on both sides of the arc-shaped support middle plate. Both sides of the arc-shaped support middle plate are connected to the corresponding arc-shaped support side plate through the guide hydraulic cylinder. The guide inner support unit includes a guide inner support hydraulic telescopic rod, a guide inner support ball joint, and a spherical sliding support. The fixed end of the guide inner support hydraulic telescopic rod is equipped with the spherical sliding support, and the telescopic end is connected to the corresponding arc support middle plate through the guide inner support ball joint. The movable ball joint bearing includes a movable ball joint bearing body, a spherical annular retaining plate, and a spherical sliding groove. The spherical sliding groove is formed between the movable ball joint bearing body and the spherical annular retaining plate. The spherical sliding groove is arranged in a circle along the meridian direction of the movable ball joint bearing. The shape of the spherical sliding support corresponds to the shape of the spherical sliding groove, and the spherical sliding support is engaged in the spherical sliding groove.

2. The method for guiding construction of an existing tunnel using a tunnel siding shield as described in claim 1, characterized in that... Before the tunnel boring machine excavates the intersection of the inclined tunnel and the existing tunnel, the soil around the intersection of the existing tunnel and the inclined tunnel is reinforced by grouting.

3. The method for guiding construction of an existing tunnel using a tunnel siding shield as described in claim 1, characterized in that... The guide support shoe is provided with a guide support shoe pad.

4. The method for guiding the construction of an existing tunnel using a tunnel siding shield as described in claim 1, characterized in that... The arc-shaped support side plate is connected to the guide support shoe via a steel hinge.

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