Shield tunnel transverse oval deformation treatment and transverse stiffness improvement structure and working method

Abstract

This invention discloses a structure and working method for treating transverse elliptical deformation and improving lateral stiffness in shield tunnels. The structure includes several tension members and several thrust members, both located outside the tunnel's service clearance. The tension members are installed in the upper region of the tunnel segment ring, with both ends of each member connected to fixed supports at the hoisting holes of the tunnel segment ring. The tension members are arranged circumferentially in the upper region of the tunnel segment ring. The thrust members are installed in the side region of the tunnel segment ring, with both ends of each member connected to fixed supports at the hoisting holes of the tunnel segment ring. The thrust members are also arranged circumferentially in the side region of the tunnel segment ring. The advantages of this invention are: fully utilizing the hoisting holes as stress points and utilizing the space outside the tunnel's service clearance, combined with the stress characteristics of the tunnel structure, to restore and improve the cross-sectional deformation of the tunnel.

Description

Technical Field

[0001] This invention relates to the technical field of underground structural engineering, and in particular to a structure and working method for treating transverse elliptical deformation and improving transverse stiffness in shield tunnels. Background Technology

[0002] Under normal soil and water pressure, shield tunnels experience greater vertical loads than horizontal loads, making them prone to transverse elliptical deformation. This causes inward expansion of the longitudinal joints at the tunnel roof and outward expansion of the longitudinal joints on both sides. Current methods for addressing transverse elliptical deformation in tunnels involve adding internal steel rings or internally attaching fiber-reinforced composite materials. However, adding steel rings is costly, has low effectiveness, and doesn't provide load-bearing capacity immediately after installation; it only begins to improve the tunnel's lateral stiffness when further adverse deformation occurs. Internally attaching fiber-reinforced composite materials is only suitable for the tunnel roof and faces the risk of later detachment; similarly, it doesn't function immediately after installation and only becomes effective after further adverse deformation. Neither of these reinforcement methods effectively restores the tunnel's deformation.

[0003] Therefore, there is a need for a structure and working method for treating transverse elliptical deformation and improving lateral stiffness in shield tunnels that can solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by providing a structure and method for treating transverse elliptical deformation and improving transverse stiffness in shield tunnels. This structure includes several tension members and several thrust members, both located outside the tunnel's service clearance. The tension members can be shortened by twisting, thereby applying tension to the tunnel segment rings. The thrust members can be lengthened by twisting, thereby applying jacking force to the tunnel segment rings, thus achieving the restoration and improvement of the tunnel's cross-sectional deformation.

[0005] The objective of this invention is achieved through the following technical solutions: A structure for treating transverse elliptical deformation and enhancing lateral stiffness in a shield tunnel includes several tension members and several thrust members, both located outside the tunnel's service clearance. The tension members are installed in the upper region of the tunnel segment ring, with both ends connected to fixed supports at the hoisting holes of the tunnel segment ring. The tension members are arranged circumferentially in the upper region of the tunnel segment ring and can be shortened by twisting, thereby applying tension to the tunnel segment ring. The thrust members are installed in the side region of the tunnel segment ring, with both ends connected to fixed supports at the hoisting holes of the tunnel segment ring. The thrust members are arranged circumferentially in the side region of the tunnel segment ring and can be extended by twisting, thereby applying a jacking force to the tunnel segment ring.

[0006] Two tension members are provided, and the two tension members are arranged symmetrically. One tension member is connected at both ends to the fixed support at the top of the tunnel segment ring and the fixed support at the top left side of the tunnel segment ring, respectively. The other tension member is connected at both ends to the fixed support at the top of the tunnel segment ring and the fixed support at the top right side of the tunnel segment ring, respectively.

[0007] The thrust member is provided in two symmetrical arrangements. One thrust member is connected at both ends to a fixed support at the bottom left side of the tunnel segment ring and a fixed support at the top left side of the tunnel segment ring, respectively. The other thrust member is connected at both ends to a fixed support at the bottom right side of the tunnel segment ring and a fixed support at the top right side of the tunnel segment ring, respectively.

[0008] Both the tension member and the thrust member include an adjusting sleeve, a first connecting rod, and a second connecting rod. One end of the first connecting rod is rotatably connected to one of the two adjacent fixed supports, and the other end is threadedly connected to one end of the adjusting sleeve. One end of the second connecting rod is threadedly connected to the other end of the adjusting sleeve, and the other end is rotatably connected to the other of the two adjacent fixed supports.

[0009] The internal threads at both ends of the adjusting sleeve rotate in opposite directions. When the adjusting sleeve is rotated, the first connecting rod and the second connecting rod move closer to each other or further apart along the axial direction, thereby shortening or lengthening the distance between the first connecting rod and the second connecting rod, thereby generating tensile or thrust forces on the fixed support respectively.

[0010] The length of the first connecting rod is less than the length of the second connecting rod.

[0011] In each of the tension and thrust components, there are four adjusting sleeves, four first connecting rods and four second connecting rods. The four adjusting sleeves, four first connecting rods and four second connecting rods are arranged in a rectangular shape. The four second connecting rods are connected by a cross-shaped fixing rod, and the four ends of the cross-shaped fixing rod are respectively fitted onto the four second connecting rods.

[0012] The fixed support is fixedly connected to the lifting hole by connecting bolts.

[0013] A working method for treating transverse elliptical deformation and improving lateral stiffness in shield tunnels, the working method comprising the following steps: S1: On-site investigation to determine the tunnel's transverse elliptical deformation and longitudinal joint opening, and to determine the treatment and reinforcement plan; S2: Design and fabricate tension and thrust components according to tunnel clearance requirements; S3: Clean the hoisting holes and install the fixed supports; install each of the tension members between adjacent fixed supports in the upper region of the tunnel segment ring; install each of the thrust members between adjacent fixed supports in the side region of the tunnel segment ring. S4: By twisting the tension member, the first connecting rod and the second connecting rod are brought closer to each other along the axial direction, thereby shortening the overall length of the tension member and applying tension to the tunnel segment ring; by twisting the thrust member, the first connecting rod and the second connecting rod are moved away from each other along the axial direction, thereby lengthening the overall length of the thrust member and applying jacking force to the tunnel segment ring; S5: When the tunnel deformation returns to the predetermined target, stop tightening and tighten the anti-loosening bolts or locking devices on the tension member and the thrust member; S6: Clean up the scene.

[0014] In step S4, when there are two tension members and two thrust members arranged symmetrically, multiple people work simultaneously, first simultaneously turning the two tension members to shorten them, and then simultaneously turning the two thrust members to lengthen them; or one person turns them in a cyclical manner, following the order: turning one tension member, turning the thrust member on the same side, turning the other tension member, and turning the thrust member on the other side.

[0015] The advantages of this invention are: 1. Make full use of the hoisting holes as stress points and utilize the space outside the tunnel clearance, combined with the stress characteristics of the tunnel structure, to restore and improve the cross-sectional deformation of the tunnel. 2. Compared with the existing method of using internal steel rings to treat the transverse elliptical deformation of tunnels, this method is faster to install, lower in cost, and has a restorative effect on the transverse elliptical deformation of tunnels. The resistance to transverse deformation of tunnels is immediately exerted, without the need for further adverse deformation of the tunnel to take effect. Attached Figure Description

[0016] Figure 1 This is a schematic elevation view of the shield tunnel transverse elliptical deformation treatment and transverse stiffness enhancement structure of the present invention. Figure 2 This is a plan view of the thrust component of the present invention in its installation state; Figure 3 This is an elevation view of the thrust component of the present invention in its installed state; Figure 4 This is a planar schematic diagram of the cross-shaped fixing rod of the present invention; Figure 5 This is a schematic elevation view of the cross-shaped fixing rod of the present invention; Figure 6 This is a planar schematic diagram of the thrust component of the present invention; Figure 7 This is a frontal schematic diagram of the thrust component of the present invention; Figure 8 This is a schematic diagram of the adjusting sleeve of the present invention; Figure 9 This is a plan view of the fixed support of the present invention; Figure 10 This is a schematic elevation view of the fixed support of the present invention; Figure 11 This is a plan view of the connecting bolt of the present invention; Figure 12 This is a frontal view of the connecting bolt of the present invention; like Figures 1-12 As shown in the figure, the labels represent: 1. Tunnel segment ring; 2. Tunnel clearance; 3. Fixed support; 3. Double-ended bolt; 31. Connecting bolt mounting hole; 32. Rod end slot; 33. Connecting bolt; 4. Adjustable sleeve; 5. First connecting rod; 6. Second connecting rod; 7. Cross fixing rod; 8. Detailed Implementation

[0017] 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 1-12As shown, this embodiment relates to a structure for treating transverse elliptical deformation and improving transverse stiffness in a shield tunnel. This structure mainly includes two tension members and two thrust members. Both tension and thrust members are located outside the tunnel clearance 2 (i.e., they do not intrude into the vehicle or equipment clearance). Of course, the number of tension and thrust members can also be different, determined according to the actual construction conditions. The two tension members are symmetrically arranged and installed in the upper region of the tunnel segment ring 1. One tension member's two ends are connected to the topmost fixed support 3 and the top left fixed support 3 of the tunnel segment ring 1, respectively. The other tension member's two ends are connected to the topmost fixed support 3 and the top right fixed support 3 of the tunnel segment ring 1, respectively. The tension members can be shortened by twisting, thereby applying tension to the tunnel segment ring 1. When the tunnel undergoes transverse elliptical deformation, the top longitudinal joint typically widens inward (opens towards the inside of the tunnel). By simultaneously shortening and generating tension through two tension members, the left and right upper and lower joints can be pulled together towards the center top, actively closing the inwardly widening longitudinal joint and restoring the circular shape of the tunnel cross-section. The two thrust members are symmetrically arranged and installed on the side regions of the tunnel segment ring 1. One thrust member's two ends are connected to the fixed supports 3 at the bottom left side and top left side of the tunnel segment ring 1, respectively. The other thrust member's two ends are connected to the fixed supports 3 at the bottom right side and top right side of the tunnel segment ring 1, respectively. The thrust members can be extended by twisting, thereby applying a jacking force to the tunnel segment ring 1. When the tunnel undergoes transverse elliptical deformation, the two side longitudinal joints typically widen outward (opens towards the outside of the tunnel). By simultaneously extending and generating jacking force through two thrust members, the bottom and top on the same side can be pushed outward, actively closing the outwardly widening side longitudinal joint, while resisting lateral compression and improving the tunnel's lateral stiffness.

[0018] The tunnel segment ring 1 has a lifting hole, which is a pre-embedded threaded hole. The fixed support 3 is fixedly connected to the lifting hole by the connecting bolt 4. The fixed support 3 has a connecting bolt mounting hole 32 in the middle, and the connecting bolt 4 passes through the connecting bolt mounting hole 32 and is threadedly connected to the lifting hole.

[0019] Both the tension and thrust components include an adjusting sleeve 5, a first connecting rod 6, and a second connecting rod 7. One end of the first connecting rod 6 is rotatably connected to one of the two adjacent fixed supports 3, and the other end is threadedly connected to one end of the adjusting sleeve 5. One end of the second connecting rod 7 is threadedly connected to the other end of the adjusting sleeve 5, and the other end is rotatably connected to the other of the two adjacent fixed supports 3. The internal threads at both ends of the adjusting sleeve 5 rotate in opposite directions. When the adjusting sleeve 5 is rotated, the first connecting rod 6 and the second connecting rod 7 move closer to or further away from each other axially, shortening or lengthening the distance between them, thereby generating tension or thrust on the fixed supports 3 respectively. The length of the first connecting rod 6 is shorter than the length of the second connecting rod 7 to facilitate the arrangement and operation of the adjusting sleeve 5 within a limited space. In each tension component and each thrust component, there are four adjusting sleeves 5, four first connecting rods 6, and four second connecting rods 7. These four adjusting sleeves 5, four first connecting rods 6, and four second connecting rods 7 are arranged in a rectangular pattern. The four second connecting rods 7 are connected by cross-shaped fixing rods 8, with each of the four ends of the cross-shaped fixing rod 8 fitted onto one of the four second connecting rods 7. Correspondingly, each side of the fixed support 3 has four rod end placement slots 33. Two double-ended bolts 31 are installed on one or both sides of the fixed support 3 (two on each side). The threads of the double-ended bolts 31 pass through the fixed support 3 and are fixed to it with nuts. The ends of the first connecting rods 6 and second connecting rods 7 are fitted onto the threads of the double-ended bolts 31 and placed in the rod end placement slots 33, thus achieving a rotatable connection. This four-group parallel structure significantly increases the total load-bearing capacity of a single component (tension or thrust), while simultaneously dispersing stress and improving reliability. The cross-shaped fixing rod 8 connects the four second connecting rods 7 into one unit, preventing lateral instability or torsional deformation during stress, and ensuring that the rods are evenly stressed and work together. The four rod end slots 33 on the fixed support 3 provide precise positioning and guidance, ensuring that the connecting rods always transmit force in the designed direction.

[0020] like Figures 1-12 As shown, this embodiment also relates to a working method for treating transverse elliptical deformation and improving transverse stiffness in shield tunnels. This working method mainly includes the following steps: S1: On-site investigation to determine the transverse elliptical deformation and longitudinal joint opening of the tunnel, and to determine the treatment and reinforcement plan.

[0021] S2: Design and fabricate tension and thrust components in accordance with the tunnel clearance requirements 2.

[0022] S3: Clean the hoisting hole and install the fixed support 3; install the two tension members between the top and left top fixed supports 3 of the tunnel segment ring 1 and between the top and right top fixed supports 3 of the tunnel segment ring 1 respectively; install the two thrust members between the top left and left bottom fixed supports 3 of the tunnel segment ring 1 and between the top right and right bottom fixed supports 3 of the tunnel segment ring 1 respectively.

[0023] S4: By twisting the tension member, the first connecting rod 6 and the second connecting rod 7 are brought closer to each other along the axial direction, thereby shortening the overall length of the tension member and applying tension to the tunnel segment ring 1; by twisting the thrust member, the first connecting rod 6 and the second connecting rod 7 are moved away from each other along the axial direction, thereby lengthening the overall length of the thrust member and applying jacking force to the tunnel segment ring 1.

[0024] When multiple people work simultaneously, first, they simultaneously turn the two tension components to shorten them, and then simultaneously turn the two thrust components to lengthen them. When one person turns them in sequence, the following order applies: turn one tension component (left / right tension component), turn the same side thrust component (left / right thrust component), turn another tension component (right / left tension component), and turn the other side thrust component (right / left thrust component).

[0025] S5: When the tunnel deformation returns to the predetermined target, stop tightening and tighten the anti-loosening bolts or locking devices on the tension and thrust components.

[0026] The predetermined goals are to restore the transverse elliptical deformation of the tunnel to the design allowable range or to close the longitudinal joint to the set width. Anti-loosening bolts or locking devices are installed at the end of the adjusting sleeve 5 to prevent it from loosening due to vibration during use.

[0027] S6: Clean up the scene.

[0028] The advantages of this invention are: 1. Make full use of the hoisting holes as stress points and utilize the space outside the tunnel clearance, combined with the stress characteristics of the tunnel structure, to restore and improve the cross-sectional deformation of the tunnel. 2. Compared with the existing method of using internal steel rings to treat the transverse elliptical deformation of tunnels, this method is faster to install, lower in cost, and has a restorative effect on the transverse elliptical deformation of tunnels. The resistance to transverse deformation of tunnels is immediately exerted, without the need for further adverse deformation of the tunnel to take effect.

Claims

1. A structure for treating transverse elliptical deformation and improving transverse stiffness in shield tunnels, characterized in that... The structure includes several tension members and several thrust members, both located outside the tunnel clearance. The tension members are installed in the upper region of the tunnel segment ring, with both ends connected to fixed supports at the hoisting holes of the tunnel segment ring. The tension members are arranged circumferentially in the upper region of the tunnel segment ring, and can be shortened by twisting to apply tension to the tunnel segment ring. The thrust members are installed in the side region of the tunnel segment ring, with both ends connected to fixed supports at the hoisting holes of the tunnel segment ring. The thrust members are arranged circumferentially in the side region of the tunnel segment ring, and can be extended by twisting to apply a jacking force to the tunnel segment ring.

2. The shield tunnel transverse elliptical deformation treatment and transverse stiffness enhancement structure as described in claim 1, characterized in that... Two tension members are provided, and the two tension members are arranged symmetrically. One tension member is connected at both ends to the fixed support at the top of the tunnel segment ring and the fixed support at the top left side of the tunnel segment ring, respectively. The other tension member is connected at both ends to the fixed support at the top of the tunnel segment ring and the fixed support at the top right side of the tunnel segment ring, respectively.

3. The shield tunnel transverse elliptical deformation treatment and transverse stiffness enhancement structure as described in claim 1, characterized in that... The thrust member is provided in two symmetrical arrangements. One thrust member is connected at both ends to a fixed support at the bottom left side of the tunnel segment ring and a fixed support at the top left side of the tunnel segment ring, respectively. The other thrust member is connected at both ends to a fixed support at the bottom right side of the tunnel segment ring and a fixed support at the top right side of the tunnel segment ring, respectively.

4. The shield tunnel transverse elliptical deformation treatment and transverse stiffness enhancement structure as described in claim 1, characterized in that... Both the tension member and the thrust member include an adjusting sleeve, a first connecting rod, and a second connecting rod. One end of the first connecting rod is rotatably connected to one of the two adjacent fixed supports, and the other end is threadedly connected to one end of the adjusting sleeve. One end of the second connecting rod is threadedly connected to the other end of the adjusting sleeve, and the other end is rotatably connected to the other of the two adjacent fixed supports.

5. The shield tunnel transverse elliptical deformation treatment and transverse stiffness enhancement structure as described in claim 4, characterized in that... The internal threads at both ends of the adjusting sleeve rotate in opposite directions. When the adjusting sleeve is rotated, the first connecting rod and the second connecting rod move closer to each other or further apart along the axial direction, thereby shortening or lengthening the distance between the first connecting rod and the second connecting rod, thereby generating tensile or thrust forces on the fixed support respectively.

6. The shield tunnel transverse elliptical deformation treatment and transverse stiffness enhancement structure as described in claim 4, characterized in that... The length of the first connecting rod is less than the length of the second connecting rod.

7. The shield tunnel transverse elliptical deformation treatment and transverse stiffness enhancement structure as described in claim 4, characterized in that... In each of the tension and thrust components, there are four adjusting sleeves, four first connecting rods and four second connecting rods. The four adjusting sleeves, four first connecting rods and four second connecting rods are arranged in a rectangular shape. The four second connecting rods are connected by a cross-shaped fixing rod, and the four ends of the cross-shaped fixing rod are respectively fitted onto the four second connecting rods.

8. The shield tunnel transverse elliptical deformation treatment and transverse stiffness enhancement structure as described in claim 1, characterized in that... The fixed support is fixedly connected to the lifting hole by connecting bolts.

9. The working method for the transverse elliptical deformation treatment and transverse stiffness enhancement structure of a shield tunnel as described in any one of claims 1 to 6, characterized in that... The working method includes the following steps: S1: On-site investigation to determine the transverse elliptical deformation and longitudinal joint opening of the tunnel, and to determine the treatment and reinforcement plan; S2: Design and fabricate tension and thrust components according to tunnel clearance requirements; S3: Clean the hoisting holes and install the fixed supports; install each of the tension members between adjacent fixed supports in the upper region of the tunnel segment ring; install each of the thrust members between adjacent fixed supports in the side region of the tunnel segment ring. S4: By twisting the tension member, the first connecting rod and the second connecting rod are brought closer to each other along the axial direction, thereby shortening the overall length of the tension member and applying tension to the tunnel segment ring; by twisting the thrust member, the first connecting rod and the second connecting rod are moved away from each other along the axial direction, thereby lengthening the overall length of the thrust member and applying jacking force to the tunnel segment ring; S5: When the tunnel deformation returns to the predetermined target, stop tightening and tighten the anti-loosening bolts or locking devices on the tension member and the thrust member; S6: Clean up the scene.

10. The working method for the transverse elliptical deformation treatment and transverse stiffness enhancement structure of a shield tunnel as described in claim 9, characterized in that... In step S4, when there are two tension members and two thrust members arranged symmetrically, multiple people work simultaneously, first simultaneously turning the two tension members to shorten them, and then simultaneously turning the two thrust members to lengthen them; or one person turns them in a cyclical manner, following the order: turning one tension member, turning the thrust member on the same side, turning the other tension member, and turning the thrust member on the other side.

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