Round working well negative ring duct piece assembling and supporting system and assembling method thereof

Abstract

The invention discloses a circular working well negative ring duct piece assembling and supporting system and an assembling method thereof.The system comprises a guide table located at the bottom and a guide rail arranged on the guide table, an abutment is arranged at the side end of the guide table, and a bottom steel box structure used for supporting the bottom side of a negative ring duct piece is arranged on the abutment. And a group of pipe piece annular supports are arranged side by side in the negative ring pipe piece in the longitudinal direction of the tunnel. The pipe piece annular support is formed by splicing a set of arc-shaped supporting steel, the arc-shaped supporting steel is arc-shaped I-shaped steel, and after the ends of the adjacent arc-shaped supporting steel are in butt joint, the adjacent arc-shaped supporting steel is fixedly connected through splicing plates on the side faces. According to the negative ring duct piece assembling and reinforcing construction scheme, through precise elevation control, a complete stress system and multiple reinforcing supports, the construction quality and the structure safety are comprehensively guaranteed; through the arrangement of the through type steel box, an integral force transmission structure from the shield tail to the reaction frame is constructed, and meanwhile, the annular support, the locking structure and the embedded plate are connected, so that the integral rigidity and the splicing stability of the duct piece are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of tunnel boring machine (TBM) construction technology, and in particular to a circular working shaft negative ring segment assembly support system and its assembly method. Background Technology

[0002] Currently, in the narrow space of the shield tunneling negative ring segment assembly construction combining the circular working shaft and the front and rear pilot tunnels, it is impossible to assemble the negative ring segment in the conventional way under the narrow space conditions. It is necessary to assemble 6-7 ring segments continuously before reverse pushing. During the reverse pushing process, the segments are affected by their own structural gravity and are prone to elliptic deformation, which poses a risk of segment falling. To avoid this risk, certain support needs to be provided during the negative ring segment assembly and reverse pushing process.

[0003] For example, patent CN120739539A discloses a method for assembling and fixing negative ring segments of a tunnel boring machine. This method uses a closed-ring installation method to stagger the assembly of negative ring 7 and negative ring 6 segments. After assembly, the two ring segments are pushed back onto the reaction frame. Wooden blocks are used to support the longitudinal I-beams of the supporting triangular frame outside the negative ring 7 and negative ring 6 segments and on the starting platform track. All negative ring 7 and negative ring segments are fixed with steel wire ropes. Anti-tilting devices are installed on both sides of the bottom of the negative ring 7 and negative ring 6 segments. Using the negative ring segment as a reference, the remaining six negative ring segments are installed sequentially. Without stable support, negative ring segments are prone to elliptic deformation, increasing the risk of segment collapse. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a circular working well negative ring segment assembly support system and its assembly method, aiming to achieve stable and reliable negative ring segment assembly.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A circular working well negative ring segment assembly support system includes a guide platform at the bottom and a guide rail on the guide platform. The guide platform has a pier at its side end, and the pier has a bottom steel box structure for supporting the bottom side of the negative ring segment.

[0006] Further or preferred: The bottom steel box structure is a hollow steel box. The top of the hollow steel box is an inclined structure that fits into the outer edge of the negative ring tube segment, and the bottom of the hollow steel box is a bottom steel plate.

[0007] A set of bottom strip holes are arranged side by side on the bottom steel plate, and a stiffening plate is provided corresponding to the bottom strip holes. The stiffening plate is located inside the hollow steel box to support the inclined structure.

[0008] A side support structure is provided on the outer waist of the negative ring segment. The side support structure includes a set of pre-embedded rebars, pre-embedded steel plates and side steel sections. A set of pre-embedded rebars is implanted into the tunnel. The pre-embedded steel plates are used to connect the upper and lower pre-embedded rebars to form a cavity structure. The side steel sections are located in the cavity structure and extend from the end face to form a lateral support sidewall guide rail structure.

[0009] The outer side of the guide platform is provided with a diagonal bracing structure before the negative ring segment exits the guide hole range. The diagonal bracing structure includes a triangular support frame and a diagonal bracing steel. The diagonal bracing steel is fixed on the top of the triangular support frame, and the steel surface of the diagonal bracing steel corresponds to the outer side of the negative ring segment.

[0010] The negative ring segment is provided with a set of circumferential supports arranged side by side along the longitudinal direction of the tunnel.

[0011] The circumferential support of the segment is composed of a set of arc-shaped support steels spliced ​​together. The arc-shaped support steels are arc-shaped I-beams. The ends of adjacent arc-shaped support steels are joined together and then fixedly connected by the side splicing plates.

[0012] The arc-shaped I-beam has a connecting structure in the middle, which includes a connecting plate and a stiffening plate. The connecting plate is connected to the edge of the outer flange, and the stiffening plate is located between the two flanges and connected to the connecting plate. The connecting plate has a connecting hole for connecting to the negative ring segment.

[0013] A locking structure is provided between two adjacent circumferential supports of the segment. The locking structure is a square tube structure. The end of the square tube structure is connected to the web of the corresponding arc-shaped I-beam. The middle part of the square tube structure is provided with a locking hole that is connected to the segment hoisting hole.

[0014] An assembly method for the circular working well negative ring segment assembly support system includes the following construction steps: S1, construction of the negative ring segment guide platform and the guide rail and bottom steel box structure on the guide platform; S2, Positioning construction of guide rails for secondary lining sidewalls; S3, Construction of the triangular support structure on the outer side of the negative ring segment; S4. Construction of circumferential support for the inner side of the negative ring segment; S5. Assembly of negative ring segments.

[0015] Compared with the prior art, the present invention has the following advantages: The circular working shaft negative ring segment assembly support system and its assembly method are rationally designed. This negative ring segment assembly and reinforcement construction scheme comprehensively ensures construction quality and structural safety through precise elevation control, a complete force-bearing system, and multiple reinforcement supports. Before construction, the bottom guide rail is accurately marked, back-calculated and adjusted, and beveled to ensure accurate segment positioning and straight alignment from the source. By setting up a through-type steel box, an overall force transmission structure from the shield tail to the reaction frame is constructed. At the same time, the circumferential support, locking structure, and embedded plate connection significantly improve the overall rigidity and assembly stability of the segments. The overall scheme has reasonable process connections, clear force distribution, and effective control measures, which not only ensures the stability of the negative ring segment force-bearing system but also effectively improves construction efficiency and quality. Attached Figure Description

[0016] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings: Figure 1 This is a schematic diagram of the bottom guide rail of the tube segment of the present invention.

[0017] Figure 2 This is a schematic diagram of the bottom steel box and side steel sections of the tube segment of the present invention.

[0018] Figure 3 This is a schematic diagram of the bottom steel box of the present invention.

[0019] Figure 4 This is a schematic diagram of the side steel section of the present invention.

[0020] Figure 5 This is a schematic diagram of the diagonal bracing structure of the present invention.

[0021] Figure 6 This is a schematic diagram of the diagonal bracing structure arrangement of the present invention.

[0022] Figure 7 This is a schematic diagram of the circumferential support structure for the pipe segments of the present invention.

[0023] Figure 8 This is a schematic diagram of the assembly of the arc-shaped support steel and the assembly plate of the present invention.

[0024] Figure 9 for Figure 8 A top-down view.

[0025] Figure 10 This is a schematic diagram of the circumferential support and locking structure of the present invention.

[0026] Figure 11 This is a schematic diagram of the assembly of adjacent arc-shaped support steels according to the present invention.

[0027] Figure 12 This is a schematic diagram of the circumferential support and segment connection of the present invention.

[0028] Figure 13This is a schematic diagram of the circumferential supports arranged side by side according to the present invention.

[0029] In the picture: 1. Negative ring segment, 2. Bottom guide rail, 3. Bottom steel box, 301. Bottom steel plate, 302. Reinforcing plate, 4. Embedded rebar, 5. Side steel section, 6. Embedded steel plate, 7. Diagonal bracing structure, 8. Circumferential support for segment, 801. Arc-shaped support steel, 802. Assembly plate, 803. Connection structure, 9. Locking structure. Detailed Implementation

[0030] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and through the description of the examples.

[0031] Although the invention has been shown and described herein with reference to specific embodiments, it is not intended to be limited to the details shown. Rather, various modifications in detail may be made within the equivalent scope and scope of the claims without departing from the invention. In the drawings, the same item numbers refer to the same elements.

[0032] Throughout this disclosure, various terms are used to describe the physical shape or arrangement of features. Many of these terms are used to describe features conforming to a cylindrical or generally cylindrical geometry with the feature as its radius and a central axis perpendicular to that radius. Unless otherwise specified, the terms are given the following meanings: The terms “longitudinal,” “longitudinal,” “axial,” and “axial” refer to a direction, dimension, or orientation parallel to the central axis. The terms “radial” and “radially” refer to a direction, dimension, or orientation perpendicular to the central axis. The terms “inward” and “inner” refer to a direction, dimension, or orientation extending radially toward the central axis. The terms “outward” and “outer” refer to a direction, dimension, or orientation extending radially away from the central axis.

[0033] In this specification, relative terms such as “horizontal,” “vertical,” “upward,” “downward,” “top,” and “bottom,” and their derivatives (e.g., “horizontal,” “downward,” “upward,” etc.) should be interpreted as referring to the direction described or the direction shown in the accompanying drawings. These relative terms are for ease of description and are not generally intended to require a specific direction.

[0034] like Figures 1 to 13 As shown, the circular working well negative ring segment assembly support system includes a guide platform at the bottom and a bottom guide rail 2 on the guide platform. A pier is provided on the side end of the bottom guide platform, and a bottom steel box 3 for supporting the bottom side of the negative ring segment 1 is provided on the pier.

[0035] Before assembling the negative ring segment, the elevation of the two guide rails in the middle of the bottom of the original segment needs to be determined. Then, the bottom elevation of the segment is calculated based on the center of the tunnel boring machine. The elevation of the two guide rails is then processed to match the required elevation, and a bevel is made within 200mm of the front end.

[0036] After the removal of the negative ring segment is completed, the secondary guide platform at the bottom of the original segment needs to be reprocessed. To ensure sufficient support reaction force after the subsequent segment exits the shield tail, the guide platform should be at least 350mm away from the shield tail, and the end in contact with the reaction frame should be flush with the first-stage guide platform. Steel rails should be pre-embedded in the guide platform, with the rail angle maintained at 65° and a 50mm gap left between the surface and the outer contour of the segment. The rails must be properly anchored.

[0037] To ensure the stress system of the tunnel segments after reassembly, two steel boxes are arranged at the 72° position of the tunnel segments. The length of the steel boxes extends from the shield tail to the position of the reaction frame. The steel boxes on both sides are fixed according to the elevation and position of the bottom platform. Preferably, the bottom steel box structure is a hollow steel box. The top of the hollow steel box is an inclined structure that fits against the outer edge of the negative ring tunnel segment, and the bottom of the hollow steel box is a bottom steel plate 301.

[0038] A set of bottom strip holes are arranged side by side on the bottom steel plate 301, and a stiffening plate 302 is set corresponding to the bottom strip holes. The stiffening plate is located inside the hollow steel box to support the inclined structure. Long side upright plate and short side upright plate are welded on the bottom steel plate, and a top sealing plate is welded to the top of the long side upright plate and the short side upright plate. The top sealing plate forms an inclined support structure, and the structure is stable and reliable.

[0039] A side support structure is provided on the outer waist of the corresponding negative ring segment; preferably, the side support structure includes a set of pre-embedded rebars 4, pre-embedded steel plates 6 and side steel sections 5. A set of pre-embedded rebars is implanted into the tunnel, the pre-embedded steel plates are used to connect the upper and lower pre-embedded rebars to form a cavity structure, the side steel sections are set in the cavity structure, and the side steel sections extend out of the end face to form a lateral support side wall guide rail structure, the structure is stable and reliable.

[0040] Specifically, during the assembly of the -5 and -4 rings, the internal dimensions of the secondary lining are measured. After measurement, the dimensions are reversed relative to the shield centerline to determine the width (H40 steel) of the additional fixing steel required. Then, rebar is installed at the tunnel waist (500mm below the 90° position) at a depth of 300mm, with a drilled hole diameter of 25mm. φ22mm steel bars are used, with the exposed length of the rebar less than 50mm of the clearance. The spacing between rebars is 400mm, with two layers. To ensure the stability of the steel, 15mm thick steel plates are cut every 400mm during the rebar installation process. Each plate is connected by four steel bars, and the H-beams are welded to the steel plates. As the -5 and -4 rings are assembled and advanced backward, when the -5 ring segment has protruded 800mm from the shield tail, the side steel is installed. The side steel is placed on top of the rebar, and the steel is welded to the rebar for fixation. After the steel is fixed, the remaining segments are advanced to the designated position. The front end of the steel section needs to be beveled to prevent the inner segments of the shield from misaligning and getting stuck on the guide rail (the bevel length is controlled at 200mm*200mm). Before the negative ring is pushed to the guide rail, grease needs to be applied to the surface of the guide rail to reduce frictional resistance.

[0041] An inclined bracing structure 7 is provided on the outer side of the guide platform before the negative ring segment exits the guide hole. The inclined bracing structure includes a triangular support frame and an inclined bracing steel. The inclined bracing steel is fixed on the top of the triangular support frame, and the steel surface of the inclined bracing steel corresponds to the outer side of the negative ring segment.

[0042] Specifically, before the negative ring segment exits the pilot tunnel area, triangular supports are installed on the right side along the tunnel direction. These supports are made of 300×300 H-beams. The triangular supports are positioned 100mm below the top block of the -4 ring. An additional diagonal support is added at the midpoint of each of the -4, -3, and -2 rings. A 300×300 H-beam is used as a crossbeam support at the contact surface with the segment. All connections between the steel sections are welded. Embedded parts are installed at the contact points between the steel sections and the concrete surface, and the steel sections are welded to them for fixation. After the internal segment support construction is completed, triangular supports are installed on the right-side concrete pilot platform along the tunnel axis. The vertical supports reach a height of 2.3m, and the lateral supports extend to the bottom plate. Horizontal supports are then welded to the concrete pilot platform surface to connect the vertical and diagonal supports into a unified structure. Each diagonal brace is installed in the middle of each ring segment and longitudinally connected at the bottom of the concrete pilot platform. A longitudinal 30mm steel section is installed at the top of the triangular supports, with its surface parallel to the surface of the negative ring segment and a spacing of less than 50mm.

[0043] A set of circumferential supports 8 are installed side-by-side along the longitudinal direction of the tunnel inside the negative ring segment. To ensure stability during the segment assembly stage, circumferential supports need to be added inside the segment and connected to it before subsequent segment assembly work can proceed. The internal ring hoops are made of bent I-beams of 20mm diameter, with each hoop being 2.034m long, and a total of 12 hoops. They are connected with 8 φ20 bolts. A locking structure is added at the segment hoisting hole to ensure the fit between the hoop and the segment. In addition, a 200mm*150mm embedded plate is welded to the middle of each hoop. Two holes with a diameter of 23mm are opened on each side of the I-beam for connection with the negative ring segment.

[0044] Preferably, the circumferential support of the tunnel segment is composed of a set of arc-shaped support steels 801 spliced ​​together. The arc-shaped support steels are arc-shaped I-beams, and the ends of adjacent arc-shaped support steels are joined together and fixedly connected by the side splicing plates 802.

[0045] The curved I-beam has a connecting structure 803 in the middle. The connecting structure includes a connecting plate and a stiffening plate. The connecting plate is connected to the edge of the outer flange. The stiffening plate is set between the two flanges and connected to the connecting plate. The connecting plate has a connection hole for connecting to the negative ring segment. The structure is stable and reliable.

[0046] A locking structure 9 is provided between two adjacent circumferential supports of the pipe segments. The locking structure is a square tube structure. The end of the square tube structure is connected to the web of the corresponding arc-shaped I-beam. The middle of the square tube structure is provided with a locking hole that is connected to the pipe segment hoisting hole. The pipe segment hoisting hole and the locking hole are connected by fasteners to ensure the fit between the ring hoist and the pipe segment.

[0047] This invention solves the problems of settlement, misalignment, deformation, and jamming of negative ring segments during the entire process of assembly, advancement, shield tail dismantling, and reassembly by constructing a three-dimensional support system of "precise bottom positioning + strong lateral support at the waist + external diagonal bracing to prevent deformation + internal ring hoop to maintain roundness". This achieves high-precision assembly, safe jacking, and stable operation of the segments. Specifically, the elevation of the two guide rails at the bottom of the original segment is first determined and then precisely adjusted to the required elevation using back-calculation based on the shield machine center. Beveling is performed within 200mm of the front end. After the negative ring segment is dismantled, a secondary guide platform is reconstructed, with the platform at least 350mm from the shield tail. 65° steel rails are pre-embedded with a 50mm gap and properly anchored. Simultaneously, a hollow steel box is placed at the 72° position of the segment as a bottom support, with reinforcing plates, vertical plates, and sealing plates inside to ensure structural stability. For the lateral support at the waist, 22mm φ22 steel bars are installed 500mm below the 90° position at the tunnel waist. With a spacing of 400mm and 300mm, and using pre-embedded steel plates and H40 steel sections, the steel sections are installed 800mm after the shield tail emerges from the -5 ring. A 200mm×200mm bevel is made at the front end to prevent jamming. Before the tunnel segment emerges from the guide tunnel, H300×300 triangular support frames and diagonal steel sections are arranged along the right side of the line from the -4 ring to the -2 ring. They are welded into a whole and kept at a distance of less than 50mm from the tunnel segment to resist the external expansion force of the tunnel segment. The internal circumferential support is set along the longitudinal direction of the tunnel using 20mm I-beams. Each ring has 12 sections connected by bolts. A pre-embedded plate and connecting hole are set in the middle. The adjacent rings are locked with square tubes to ensure the roundness and fit of the tunnel segment. The entire process follows the control logic of unified benchmark, support before assembly, low friction to prevent jamming, and full constraint stability. The guide rail surface is coated with grease to reduce frictional resistance, ensuring high accuracy of tunnel segment assembly, smooth advancement, and structural stability, providing safe and reliable operating conditions for shield launching / receiving.

[0048] This invention provides an assembly method for a circular working well negative ring segment assembly support system, comprising the following construction steps: S1. Construction of the negative ring segment guide platform, guide rails on the guide platform, and bottom steel box structure; S2. Construction of guide rail positioning for the secondary lining sidewall; S3. Construction of the triangular support for the outer side of the negative ring segment; S4. Construction of the circumferential support for the inner side of the negative ring segment; S5. Assembly of the negative ring segment.

[0049] The circular working well negative ring segment assembly support system and its assembly method of this invention are rationally designed. This negative ring segment assembly and reinforcement construction scheme comprehensively ensures construction quality and structural safety through precise elevation control, a complete force system, and multiple reinforcement supports. Before construction, the bottom guide rail is accurately marked, back-calculated and adjusted, and beveled to ensure accurate segment positioning and straight alignment from the source. By setting a through-type steel box, an overall force transmission structure from the shield tail to the reaction frame is constructed. At the same time, the circumferential support, locking structure, and embedded plate connection significantly improve the overall rigidity and assembly stability of the segments. The overall scheme has reasonable process connections, clear force distribution, and effective control measures, which not only ensures the stability of the negative ring segment force system but also effectively improves construction efficiency and quality.

[0050] The above description is merely an illustration of preferred embodiments of the present invention, and the above technical features can be arbitrarily combined to form multiple embodiments of the present invention.

[0051] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the concept and technical solution of the present invention, or the direct application of the concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A circular working well negative ring segment assembly support system, comprising a guide platform at the bottom and a guide rail disposed on the guide platform, characterized in that: The guide platform is provided with a pier at its side end, and a bottom steel box structure is provided on the pier for supporting the bottom side of the negative ring segment.

2. The circular working well negative ring segment assembly and support system as described in claim 1, characterized in that: The bottom steel box structure is a hollow steel box. The top of the hollow steel box is an inclined structure that fits into the outer edge of the negative ring tube segment, and the bottom of the hollow steel box is a bottom steel plate.

3. The circular working well negative ring segment assembly and support system as described in claim 2, characterized in that: A set of bottom strip holes are arranged side by side on the bottom steel plate, and a stiffening plate is provided corresponding to the bottom strip holes. The stiffening plate is located inside the hollow steel box to support the inclined structure.

4. The circular working well negative ring segment assembly and support system as described in claim 1, characterized in that: A side support structure is provided on the outer waist of the negative ring segment. The side support structure includes a set of pre-embedded rebars, pre-embedded steel plates and side steel sections. A set of pre-embedded rebars is implanted into the tunnel. The pre-embedded steel plates are used to connect the upper and lower pre-embedded rebars to form a cavity structure. The side steel sections are located in the cavity structure and extend from the end face to form a lateral support sidewall guide rail structure.

5. The circular working well negative ring segment assembly and support system as described in claim 1, characterized in that: The outer side of the guide platform is provided with a diagonal bracing structure before the negative ring segment exits the guide hole range. The diagonal bracing structure includes a triangular support frame and a diagonal bracing steel. The diagonal bracing steel is fixed on the top of the triangular support frame, and the steel surface of the diagonal bracing steel corresponds to the outer side of the negative ring segment.

6. The circular working well negative ring segment assembly and support system as described in claim 1, characterized in that: The negative ring segment is provided with a set of circumferential supports arranged side by side along the longitudinal direction of the tunnel.

7. The circular working well negative ring segment assembly and support system as described in claim 6, characterized in that: The circumferential support of the tunnel segment is composed of a set of arc-shaped support steels spliced ​​together. The arc-shaped support steels are arc-shaped I-beams, and the ends of adjacent arc-shaped support steels are joined together and fixedly connected by the side splicing plates.

8. The circular working well negative ring segment assembly and support system as described in claim 7, characterized in that: The arc-shaped I-beam has a connecting structure in the middle, which includes a connecting plate and a stiffening plate. The connecting plate is connected to the edge of the outer flange, and the stiffening plate is located between the two flanges and connected to the connecting plate. The connecting plate has a connecting hole for connecting to the negative ring segment.

9. The circular working well negative ring segment assembly and support system as described in claim 8, characterized in that: A locking structure is provided between two adjacent circumferential supports of the segment. The locking structure is a square tube structure. The end of the square tube structure is connected to the web of the corresponding arc-shaped I-beam. The middle part of the square tube structure is provided with a locking hole that is connected to the segment hoisting hole.

10. An assembly method for a circular working well negative ring segment assembly support system as described in any one of claims 1 to 9, characterized in that: The construction steps include the following: S1, construction of the negative ring segment guide platform and the guide rail and bottom steel box structure on the guide platform; S2, Positioning construction of guide rails for secondary lining sidewalls; S3, Construction of the triangular support structure on the outer side of the negative ring segment; S4. Construction of circumferential support for the inner side of the negative ring segment; S5. Assembly of negative ring segments.

Images