A combined construction method for protecting an existing tunnel and reinforcing the same by tunneling
Patent Information
- Application Number
- CN202311834016.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-28
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2043-12-28
AI Technical Summary
During the construction of a new tunnel with inclined shield tunneling, how to protect the safety of the existing tunnel, reduce disturbance to the existing shield tunnel and soil and rock mass, and ensure the smooth excavation of the inclined tunnel?
At the intersection of the existing tunnel and the inclined tunnel, guide support frames and reinforcement support frames are installed and connected by connecting rods, force transmission hinges and force transmission hydraulic cylinders. The guide support frames support the sidewalls of the existing tunnel, and the reinforcement support frames support the inner walls of the existing tunnel. Combined with grouting to reinforce the soil, the tunnel boring machine is guided to advance.
It effectively reduces the disturbance to existing tunnels caused by inclined tunnel excavation, ensures the safety of existing tunnels, adapts to changes in tunnel size and angle, enhances the stability of existing tunnels, and reduces the impact on the rock and soil mass.
Smart Images
Figure CN117662163B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of tunnel construction, and in particular to a combined construction method for protecting and reinforcing existing tunnels using a shield tunneling machine with inclined sections. Background Technology
[0002] As urban expressways can no longer meet the needs of development, a large number of shield tunnels are being constructed, especially in first- and second-tier cities, where underground rail transit lines are densely distributed. With existing underground rail transit lines unable to meet the ever-increasing demand, many newly planned urban underground rail transit tunnels often need to cross or connect obliquely with existing shield tunnels. Protecting the safety of existing tunnels is extremely important during the oblique connection of new tunnels with shield tunnels. Summary of the Invention
[0003] The purpose of this invention is to address the shortcomings of the prior art by providing a combined construction method for guiding and reinforcing existing tunnels in inclined shield tunneling. This method involves installing guide support frames at the intersection of the existing tunnel and the inclined tunnel, and installing reinforcement support frames on both sides of the intersection. Connecting the guide support frames and reinforcement support frames together reduces disturbance to the existing shield tunnel and soil during the construction of the proposed inclined shield tunnel, guides the tunnel boring machine's excavation, ensures the safety of the existing shield tunnel, and simultaneously guarantees the smooth excavation of the inclined shield tunnel.
[0004] The objective of this invention is achieved through the following technical solutions: A combined construction method for guiding and reinforcing existing tunnels in a tunnel inclined shield tunneling project, characterized in that the construction method includes: At the intersection of the existing tunnel and the slanted tunnel, a guide support frame is installed, with the length direction of the guide support frame aligned with the direction of the slanted tunnel, and the inner diameter of the guide support frame equal to the diameter of the slanted tunnel. The guide support frame supports the sidewall of the existing tunnel. Reinforcing support frames are installed on both sides at the intersection of the existing tunnel and the slanted tunnel, and the reinforcing support frames support the inner wall of the existing tunnel. The reinforced support frames located on the same side of the guide support frame are connected by a connecting rod. The guide support frame is connected to the connecting rod in sequence by a force-transmitting hinge and a force-transmitting hydraulic cylinder. 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] The guide telescopic mechanism includes an arc-shaped support middle plate, a guide hydraulic cylinder, and arc-shaped support side plates. Both the arc-shaped support middle plate and the arc-shaped support side plates are circumferentially arranged. The arc-shaped support side plates are 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 plates through the guide hydraulic cylinder. The guide support shoe is connected to the arc-shaped support side plates on both sides of the arc-shaped support middle plate. The guide hydraulic cylinder drives the arc-shaped support side plates to move, thereby moving the guide support shoe closer to or away from the existing tunnel sidewall.
[0006] The arc-shaped support side plate is connected to the guide support shoe via a steel hinge, and the guide support shoe is provided with a guide support shoe pad.
[0007] 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.
[0008] 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.
[0009] The reinforced support frame includes a reinforced support unit and a movable column hinge bearing. The movable column hinge bearing includes a column hinge bearing body and an annular retaining plate. An annular retaining plate is provided at each end of the column hinge bearing body. An annular groove is formed between the column hinge bearing body and the two annular retaining plates. The reinforced support unit is provided with several units along the circumferential direction of the annular groove.
[0010] The reinforcement support unit includes a reinforcement support shoe and a reinforcement support hydraulic telescopic rod. The fixed end of the reinforcement support hydraulic telescopic rod is connected to the curved sliding support, and the telescopic end is connected to the reinforcement support shoe through a reinforcement support ball joint. The curved sliding support is arc-shaped and adapted to the annular sliding groove. The reinforcement support shoe is arc-shaped and adapted to the existing tunnel inner wall. The reinforcement support shoe is provided with a reinforcement support shoe pad along its arc direction.
[0011] 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.
[0012] 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 and the reinforced support hydraulic telescopic rod can adapt to existing shield tunnels of different sizes, while the guide support frame can guide the shield 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 internal support hydraulic telescopic rods and their distribution positions at the entrance of the proposed inclined shield tunnel can be adjusted as needed; (5) The number of reinforcement support units and the position of the support on the existing shield tunnel section can be adjusted as needed; (6) 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; (7) The number, spacing and reinforcement range of the reinforcement support frame can be adjusted according to the impact range of the inclined shield tunnel excavation on the existing shield tunnel; (8) The connecting rod between the reinforced support frame can increase the overall stability of the existing shield tunnel. At the same time, the force transmission hydraulic cylinder connects the reinforced support frame with the guide support frame, which can distribute the concentrated force on the guide support frame in the shield to the reinforced support frame, reducing the disturbance to the existing shield tunnel. (9) The guide support frame, the reinforcement 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
[0013] Figure 1 This is a schematic diagram (a) of the guiding and reinforcing support assembly of the present invention; Figure 2 This is a schematic diagram (II) of the guiding and reinforcing support assembly of the present invention; Figure 3 This is a schematic diagram (III) of the guiding and reinforcing support assembly of the present invention; Figure 4This is a schematic diagram of the guide support frame of the present invention; Figure 5 This is a schematic cross-sectional view of the guide support frame of the present invention; Figure 6 for Figure 5 Cross-sectional view of AA in the middle; Figure 7 for Figure 5 Cross-sectional view of BB in the middle; Figure 8 for Figure 5 Cross-sectional view of CC in the middle; Figure 9 This is a schematic diagram of the connection of the guide inner support unit of the present invention; Figure 10 This is a schematic diagram of the reinforcing support frame of the present invention; Figure 11 This is a schematic diagram of the reinforcement support unit of the present invention; Figure 12 This is a three-dimensional schematic diagram of the movable column hinge bearing of the present invention; Figure 13 This is a schematic diagram of the end face of the movable column hinge bearing of the present invention; Figure 14 This is a construction schematic diagram (I) of the guide and reinforcement support assembly of the present invention; Figure 15 This is a construction schematic diagram (II) of the guide and reinforcement support assembly of the present invention; like Figures 1-15 As shown in the figure, the labels represent: 1. Guiding and reinforcement support complex; 2. Existing tunnel; 3. Inclined tunnel; 4. Tunnel boring machine; 5. Grouting reinforcement body; 11. Guide support frame; 12. Reinforced support frame; 13. Force transmission hinge; 14. Force transmission hydraulic cylinder; 111. Guide unit; 112. Movable ball bearing; 113. Guide inner support unit; 1111. Guide telescopic mechanism; 1112. Guide support shoe; 1113. Guide support shoe gasket; 11111. Arc-supported middle plate; 11112. Guide hydraulic cylinder; 11113. Arc-supported side plate; 11114. Steel hinge; 1121. Movable ball joint bearing body; 1122. Spherical annular retaining plate; 1123. Spherical sliding groove; 1131. Guide inner support hydraulic telescopic rod; 1132. Guide inner support ball joint; 1133. Spherical sliding support; 121. Reinforced support unit; 122. Movable column hinge bearing; 123. Connecting rod; 1211. Reinforced support shoe pad, 1212. Reinforced support shoe, 1213. Reinforced support hydraulic telescopic rod, 1214. Reinforced support ball joint, 1215. Curved surface sliding support; 1221. Cylindrical bearing body; 1222. Annular retaining plate; 1223. Annular groove; 1224. Connecting hole. Detailed Implementation
[0014] 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 combined construction method for guiding and reinforcing an existing tunnel during a tunnel boring machine (TBM) excavation of the inclined tunnel 3. When the TBM 4 excavates the inclined tunnel 3, a reinforcement and support assembly 1 is used to protect the existing tunnel 2. This guidance and reinforcement support assembly 1 includes a guide support frame 11, a reinforcement support frame 12, a force transmission hinge 13, and a force transmission hydraulic cylinder 14. Both the guide support frame 11 and the reinforcement support frame 12 are installed inside the existing tunnel 2. Specifically, the existing tunnel 2 has a guide support frame 11 at its intersection with the inclined tunnel 3, and two reinforcement support frames 12 are installed on both sides of the intersection of the existing tunnel 2 and the inclined tunnel 3. The number, spacing, and reinforcement range of the reinforcing support frames 12 can be adjusted according to the impact range of the inclined tunnel 3 excavation on the existing tunnel 2. The reinforcing support frames 12 located on the same side of the guide support frame 11 are connected by connecting rods 123. The guide support frame 11 is connected to the connecting rods 123 in sequence through force-transmitting hinges 13 and force-transmitting hydraulic cylinders 14. The connecting rods 123 between the reinforcing support frames 12 can increase the overall stability of the existing tunnel 2. At the same time, the force-transmitting hydraulic cylinders 14 connect the reinforcing support frames 12 to the guide support frames 11, which can distribute the concentrated force on the guide support frames 11 in the shield tunneling to the reinforcing support frames 12, reducing disturbance to the existing tunnel 2. This construction method mainly includes: A guide support frame 11 is installed at the intersection of the existing tunnel 2 and the inclined tunnel 3, so that the length direction of the guide support frame 11 is on the same straight line as the direction of the inclined tunnel 3, and the inner diameter of the guide support frame 11 is equal to or slightly larger than the diameter of the inclined tunnel 3, and the guide support frame 11 is used to support the side wall of the existing tunnel 2; a reinforcement support frame 12 is installed on both sides at the intersection of the existing tunnel 2 and the inclined tunnel 3, and the reinforcement support frame 12 is used to support the inner wall of the existing tunnel 2.
[0015] Among them, such as Figures 1-9As shown, the guide support frame 11 consists of a guide unit 111, a movable ball bearing 112, and a guide inner support unit 113. The guide unit 111 includes a guide telescopic mechanism 1111 and a guide support shoe 1112. The guide support shoes 1112 are respectively located on both sides of the guide telescopic mechanism 1111. The shape of the outer side of the guide support shoe 1112 corresponds to the shape of the existing tunnel 2 sidewall. The outer side of the guide support shoe 1112 is arc-shaped, and the two ends of the arc are bent inward to fit the existing tunnel 2 sidewall. The guide telescopic mechanism 1111 drives the guide support shoe 1112 to move closer to or away from the existing tunnel 2 sidewall. A guide support shoe pad 1113 is provided on the outer side of the guide support shoe 1112, which can play a buffering role to protect the inner wall of the existing tunnel 2. The guide telescopic mechanism 1111 includes an arc-shaped support middle plate 11111, a guide hydraulic cylinder 11112, and an arc-shaped support side plate 11113. Both the arc-shaped support middle plate 11111 and the arc-shaped support side plate 11113 are circumferentially arranged. Arc-shaped support side plates 11113 are provided on both sides of the arc-shaped support middle plate 11111. Both sides of the arc-shaped support middle plate 11111 are connected to the corresponding arc-shaped support side plate 11113 via the guide hydraulic cylinder 11112. The fixed end of the guide hydraulic cylinder 11112 is mounted on the arc-shaped support middle plate 11111, and the telescopic end is connected to the arc-shaped support side plate 11113. 11113 is connected to the guide support shoe 1112 via a steel hinge 11114. By driving the guide hydraulic cylinder 11112, the guide support shoe 1112 on the arc support side plate 113 is moved. In conjunction with the steel hinge 11114, the orientation of the outer side of the guide support shoe 1112 is adjusted so that the guide support shoe 1112 (guide support shoe pad 1113) fits against the side wall of the existing tunnel 2, so that the guide support frame 11 is supported on the side wall of the existing tunnel 2. In this embodiment, each arc support side plate 11113 and each arc support middle plate 11111 are connected by two guide hydraulic cylinders 11112.
[0016] The movable ball joint bearing 112 is provided with several guide inner support units 113 along its meridian direction, and the number of guide inner support units 113 corresponds to the number of arc support middle plates 11111. The guide inner support unit 113 includes a guide inner support hydraulic telescopic rod 1131, a guide inner support ball joint 1132, and a spherical sliding support 1133. The fixed end of the guide inner support hydraulic telescopic rod 1131 is equipped with a spherical sliding support 23, and the telescopic end is connected to the corresponding arc support middle plate 11111 through the guide inner support ball joint 1132. The orientation of the arc support middle plate 11111 can be adjusted through the guide inner support ball joint 1132. The movable ball joint bearing 112 includes a movable ball joint bearing body 1121, a spherical annular retaining plate 1122, and a spherical groove 1123. The spherical groove 1123 is formed between the movable ball joint bearing body 1121 and the spherical annular retaining plate 1122. The spherical groove 1123 is arranged in a circle along the meridian direction of the movable ball joint bearing 112. The shape of the spherical sliding support 1133 corresponds to the shape of the spherical groove 1123, and the spherical sliding support 1133 is engaged in the spherical groove 1123.
[0017] like Figures 1-3 as well as Figures 10-13 As shown, the reinforced support frame 12 includes a reinforced support unit 121 and a movable column hinge bearing 122. The movable column hinge bearing 122 includes a column hinge bearing body 1221, an annular retaining plate 1222, an annular groove 1223, and a connecting hole 1224. An annular retaining plate 1222 is provided at each end of the column hinge bearing body 1221, and an annular groove 1223 is formed between the column hinge bearing body 1221 and the two annular retaining plates 1222. A connecting hole 1224 is provided on the column hinge bearing body 1221. The shape and size of the connecting hole 1224 are adapted to the shape and size of the connecting rod 123, respectively, for connecting the reinforced support frames 12.
[0018] Four reinforcing support units 121 are arranged circumferentially along the annular groove 1223. In this embodiment, the reinforcing support unit 121 includes a reinforcing support shoe pad 1211, a reinforcing support shoe 1212, a reinforcing support hydraulic telescopic rod 1213, a reinforcing support ball joint 1214, and a curved surface sliding support 1215. The fixed end of the reinforcing support hydraulic telescopic rod 1213 is connected to the curved surface sliding support 1215, and the telescopic end is connected to the reinforcing support shoe 1212 through the reinforcing support ball joint 1214. The telescopic movement of the reinforcing support hydraulic telescopic rod 1213 can adapt to different sizes. In the existing tunnel 2, the curved sliding support 1215 is arc-shaped and adapted to the annular sliding groove 1223. The curved sliding support 1215 can move along the circumferential direction of the annular sliding groove 1223 to adjust the position of the reinforcement support unit 121. The reinforcement support shoe 1212 is arc-shaped and is provided with reinforcement support shoe pads 1211 along its arc direction. The shape of the reinforcement support shoe 1212 is adapted to the shape of the inner wall of the existing tunnel 2 to ensure the reliability of the support. The reinforcement support shoe pads 1211 play a buffering role and can be used to protect the inner wall of the existing tunnel 2.
[0019] In this embodiment, by adjusting the guide inner support ball joint 1132 and the guide inner support hydraulic telescopic rod 1131, the position of the arc support middle plate 11111 is adjusted so that the inner diameter of the cylindrical structure formed between the arc support middle plates 11111 is equal to or slightly larger than the diameter of the inclined tunnel 3, which can guide the tunnel boring machine 4 to excavate; by adjusting the steel hinge 11114 and the guide hydraulic cylinder 11112, the position of the guide support shoe 1112 is adjusted so that the guide support shoe 1112 fits and is supported on the side wall of the existing tunnel 2, which can support existing tunnels 2 of different sizes; by adjusting the reinforcing support ball joint 1214 and the reinforcing support hydraulic telescopic rod 1213, the position of the reinforcing support shoe 1212 is adjusted so that the reinforcing support shoe 1212 fits and is supported on the inner wall of the existing tunnel 2, which can support existing tunnels 2 of different sizes.
[0020] like Figure 14 As shown, guided by the guide support frame 11, the tunnel boring machine 4 excavates the intersection of the inclined tunnel 3 and the existing tunnel 2. Furthermore, as... Figure 15 As shown, before the tunnel boring machine 4 excavates the intersection of the inclined tunnel 3 and the existing tunnel 2, the soil around the intersection of the existing tunnel 2 and the inclined tunnel 3 is grouted to reinforce it, so as to form grouted reinforced soil 5, thereby reducing the disturbance of the tunnel boring machine 4 to the existing tunnel 2 and the surrounding rock and soil.
[0021] 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 and the reinforced support hydraulic telescopic rod can adapt to existing shield tunnels of different sizes, while the guide support frame can guide the shield 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 internal support hydraulic telescopic rods and their distribution positions at the entrance of the proposed inclined shield tunnel can be adjusted as needed; (5) The number of reinforcement support units and the position of the support on the existing shield tunnel section can be adjusted as needed; (6) 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; (7) The number, spacing and reinforcement range of the reinforcement support frame can be adjusted according to the impact range of the inclined shield tunnel excavation on the existing shield tunnel; (8) The connecting rod between the reinforced support frame can increase the overall stability of the existing shield tunnel. At the same time, the force transmission hydraulic cylinder connects the reinforced support frame with the guide support frame, which can distribute the concentrated force on the guide support frame in the shield to the reinforced support frame, reducing the disturbance to the existing shield tunnel. (9) The guide support frame, the reinforcement 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.
[0022] 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 combined construction method for guiding and reinforcing existing tunnels in a tunnel inclined shield tunneling project, characterized in that... The construction method includes: At the intersection of the existing tunnel and the slanted tunnel, a guide support frame is installed, with the length direction of the guide support frame aligned with the direction of the slanted tunnel, and the inner diameter of the guide support frame equal to the diameter of the slanted tunnel. The guide support frame supports the sidewall of the existing tunnel. Reinforcing support frames are installed on both sides at the intersection of the existing tunnel and the slanted tunnel, and the reinforcing support frames support the inner wall of the existing tunnel. The reinforced support frames located on the same side of the guide support frame are connected by a connecting rod. The guide support frame is connected to the connecting rod in sequence by a force-transmitting hinge and a force-transmitting hydraulic cylinder. 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.
2. The method for combined construction of guidance and reinforcement of existing tunnels for inclined shield tunneling as described in claim 1, characterized in that... The guide telescopic mechanism includes an arc-shaped support middle plate, a guide hydraulic cylinder, and arc-shaped support side plates. Both the arc-shaped support middle plate and the arc-shaped support side plates are circumferentially arranged. The arc-shaped support side plates are 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 plates through the guide hydraulic cylinder. The guide support shoe is connected to the arc-shaped support side plates on both sides of the arc-shaped support middle plate. The guide hydraulic cylinder drives the arc-shaped support side plates to move, thereby moving the guide support shoe closer to or away from the existing tunnel sidewall.
3. The method for combined construction of guidance and reinforcement of existing tunnels for inclined shield tunneling as described in claim 2, characterized in that... The arc-shaped support side plate is connected to the guide support shoe via a steel hinge, and the guide support shoe is provided with a guide support shoe pad.
4. The method for combined construction of guidance and reinforcement of existing tunnels for inclined shield tunneling as described in claim 2, characterized in that... 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.
5. The method for combined construction of guidance and reinforcement of existing tunnels for inclined shield tunneling as described in claim 4, characterized in that... 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.
6. The method for combined construction of guidance and reinforcement of existing tunnels for inclined shield tunneling as described in claim 1, characterized in that... The reinforced support frame includes a reinforced support unit and a movable column hinge bearing. The movable column hinge bearing includes a column hinge bearing body and an annular retaining plate. An annular retaining plate is provided at each end of the column hinge bearing body. An annular groove is formed between the column hinge bearing body and the two annular retaining plates. The reinforced support unit is provided with several units along the circumferential direction of the annular groove.
7. The method for combined construction of guidance and reinforcement of existing tunnels for inclined shield tunneling as described in claim 6, characterized in that... The reinforcement support unit includes a reinforcement support shoe and a reinforcement support hydraulic telescopic rod. The fixed end of the reinforcement support hydraulic telescopic rod is connected to the curved sliding support, and the telescopic end is connected to the reinforcement support shoe through a reinforcement support ball joint. The curved sliding support is arc-shaped and adapted to the annular sliding groove. The reinforcement support shoe is arc-shaped and adapted to the existing tunnel inner wall. The reinforcement support shoe is provided with a reinforcement support shoe pad along its arc direction.
8. The method for combined construction of guidance and reinforcement of existing tunnels for inclined shield tunneling 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.
Citation Information
Patent Citations
Construction method of shield passing through advance tunnel at close distance
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