A negative ring tube sheet for improving roundness and a method of using the same

Abstract

The present application relates to the technical field of subway shield tunnel construction, and especially relates to a negative ring segment for improving roundness and a use method thereof, comprising a reference circular ring and a steel segment, the steel segment is connected with the reference circular ring through a pin, the steel segment is composed of a plurality of steel segment blocks, the plurality of steel segment blocks are connected with the reference circular ring through positioning connecting pins respectively, and the adjacent steel segment blocks are connected to make the plurality of steel segment blocks assembled to form a whole ring steel segment matching the roundness of the reference circular ring. The present application has the advantages that: the roundness of the negative ring segment is fundamentally ensured, the quality of the positive line tunnel is positively affected, the assembling difficulty of the negative ring is reduced, the construction efficiency is improved, and the safety risk is avoided to some extent; the structure is simple, the use is convenient, and the present application is suitable for promotion.

Description

Technical Field

[0001] This invention relates to the field of subway shield tunnel construction technology, and in particular to a negative ring segment for improving roundness and its application method. Background Technology

[0002] During the initial construction of a tunnel boring machine (TBM), a negative ring is typically assembled to provide reaction force for the TBM's excavation. Common negative ring structures include reinforced concrete and steel structures. Since the negative ring segments lack surrounding soil constraints, they are assembled piece by piece. After the ring is formed, it is pushed out to the tail of the shield. Measures such as support and tensioning are used to reduce convergence, but these measures cannot address the deformation that occurs during assembly. Therefore, the roundness of the negative ring segments is often not guaranteed, and the "elliptical" phenomenon is common.

[0003] However, the roundness of the negative ring segments is extremely important, especially for the first negative ring, which largely determines the roundness index of the main tunnel segments. Conventional negative ring design and assembly methods cannot solve the roundness problem. If an "elliptical" phenomenon occurs, it will cause deviation of the main tunnel segments, which will not only affect the construction quality, but also, in severe cases, cause the roundness of the main tunnel segments to fail to meet the design requirements. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by providing a negative ring segment with improved roundness and its usage method. By dividing the negative ring segment into two parts, a reference ring and modularly assembled steel segments, the steel segments are assembled piece by piece, positioned piece by piece, and fixed piece by piece, eliminating deformation during the assembly process to form the ring. Finally, the roundness of the ring is ensured by pin connection.

[0005] The objective of this invention is achieved through the following technical solutions:

[0006] A negative ring segment for improving roundness, characterized in that: it includes a reference ring and a steel segment, the steel segment being pin-connected to the reference ring, the steel segment being composed of several steel segment blocks, wherein the several steel segment blocks are respectively connected to the reference ring by positioning connecting pins, and adjacent steel segment blocks are connected to each other so that the several steel segment blocks are assembled to form a complete ring steel segment with roundness matching the reference ring.

[0007] The adjacent steel pipe segments are connected to form a whole by means of spring cylindrical pins and pipe segment connecting bolts, wherein the spring cylindrical pins are used for positioning between the steel pipe segments, and the pipe segment connecting bolts are used to connect and fasten the steel pipe segments to form a whole.

[0008] The reference ring is provided with a wing plate for connecting with the reaction frame, and the wing plate is provided with a connection hole; the reference ring is provided with a segment reference hole for connecting with each of the steel segments in sections.

[0009] The positioning connecting pin includes a cylindrical pin and a frustum. The frustum is used for positioning the steel pipe segment between the reference ring and the segment. The cylindrical pin and the frustum are fitted together.

[0010] The steel segments are irregularly shaped steel segments, with the width of the segments corresponding to the local segment width reduction at the tail seal brush of the shield being smaller, while the width of the remaining segments matches the tail of the shield machine.

[0011] A method for using a negative ring segment to improve roundness, as described above, is characterized by the following steps:

[0012] The reference ring is fixed to the reaction frame used for shield tunneling initiation construction;

[0013] Assemble and debug the tunnel boring machine so that there is a certain distance between the tail of the tunnel boring machine and the reference ring;

[0014] The first steel segment is connected to the reference ring. After adjustment, the shield machine propulsion cylinder extends from the corresponding position, so that the thrust of the shield machine propulsion cylinder acts on the steel segment.

[0015] The remaining steel pipe segments are assembled sequentially according to their adjacent positions. After each steel pipe segment is connected to the reference ring, adjacent steel pipe segments are connected one by one and the shield machine propulsion cylinders extend from the corresponding positions until several steel pipe segments are assembled into a ring.

[0016] The steel pipe segments are assembled into corresponding positions on the reference ring using an assembly machine, ensuring that the steel pipe segments are in close contact with the reference ring.

[0017] The assembly of the steel pipe segments involves first positioning and connecting the steel pipe segment to the reference ring and to the adjacent steel pipe segment, and then fastening the adjacent steel pipe segments together.

[0018] The reference ring is milled from a single piece.

[0019] The advantages of this invention are: it fundamentally ensures the roundness of the negative ring segments and positively affects the quality of the main tunnel, while reducing the difficulty of negative ring assembly, improving construction efficiency, and mitigating safety risks to a certain extent; it has a simple structure, is easy to use, and is suitable for widespread application. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the installation of the reference ring in this invention;

[0021] Figure 2 for Figure 1 Side view;

[0022] Figure 3 This is a schematic diagram of the irregularly shaped tube segment in this invention;

[0023] Figure 4 for Figure 3 Sectional view along line AA;

[0024] Figure 5 for Figure 3 Sectional view along the BB direction;

[0025] Figure 6 for Figure 4 C-axis sectional view;

[0026] Figure 7 This is a schematic diagram of the positioning connecting pin in this invention;

[0027] Figure 8 This is a schematic diagram of the connection structure between the tube segments in this invention;

[0028] Figure 9 This is a schematic diagram of the ring-shaped structure of the tube segments in this invention. Detailed Implementation

[0029] 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:

[0030] like Figure 1-9 As shown in the figure, markings 1-17 represent: 1. Reaction frame; 2. Reference ring; 3. Positioning connecting pin; 4. Segment reference point; 5. Connecting bolt; 6. Shield tail; 7. Shield machine propulsion cylinder; 8. Shield tail sealing brush; 9. Special-shaped steel segment; 10. Shield launching frame; 11. Dismantling and hoisting point; 12. Positioning connecting pin; 13. Segment connecting bolt; 14. Elastic cylindrical pin; 15. Cylindrical pin; 16. Frustum; 17. Special-shaped steel segment block.

[0031] Example: Figures 1 to 9 As shown, in this embodiment, the negative ring segment for improving roundness includes two parts: a reference ring 2 and a special-shaped steel segment 9. Both parts serve as negative ring segments to provide reaction force for shield tunneling.

[0032] 1) such as Figure 1 As shown, the reference ring 2 is installed in the shaft before the tunnel boring machine bridge assembly. During installation, the reference ring 2 is positioned on the reaction frame 1 by the positioning connecting pin 3, and the reference ring 2 and the reaction frame 1 are further fixed by the connecting bolts 5. The segment reference point 4 is a reference hole opened on the reference ring 2. Some of the reference holes are used for the connection and fixation between the reference ring 2 and the reaction frame 1, and the other part of the reference holes are used for the connection and fixation between the reference ring 2 and the special-shaped steel segment 9.

[0033] In this embodiment, the reference ring 2 is preferably milled as a whole to ensure that its surface flatness is extremely high, or even to ensure that the surface is "absolutely flat", so as to further improve the assembly reference with high roundness of the irregular steel pipe segments 9 connected to the reference ring 2, thereby effectively improving the roundness of the irregular steel pipe segments 9 after the whole ring is assembled.

[0034] In this embodiment, the connection between the reference ring 2 and the reaction frame 1 is achieved by providing an outwardly extending wing plate on the outer edge of the reference ring 2, such as... Figure 1 As shown in this embodiment, four orthogonally arranged wing plates are provided on the outer edge of the reference ring 2. The reference ring 2 and the reaction frame 1 are first positioned relative to each other by the positioning connecting pin 3 at the top of the reaction frame 1. Then, each wing plate is connected to the reaction frame 1 by the connecting bolt 5 to achieve a tight connection between the reference ring 2 and the reaction frame 1.

[0035] 2) After the reference ring 2 is installed in place, assemble and debug the tunnel boring machine. To ensure the smooth installation of the irregular steel segments 9, the distance between the tail 6 of the tunnel boring machine and the reference ring 2 should not exceed 300mm. Figure 9 As shown.

[0036] 3) The irregular steel pipe segment 9 is assembled into a ring by segment assembly, that is, the irregular steel pipe segment 9 is composed of several steel pipe segments 17 assembled together. The number and size of the segments can be determined according to the actual construction requirements. In this embodiment, the irregular steel pipe segment 9 is composed of six irregular steel pipe segments assembled together.

[0037] After the tunnel boring machine (TBM) assembly and commissioning are completed, the first irregularly shaped steel segment is installed. First, the positioning connecting pin 12 is installed on the irregularly shaped steel segment 17, as follows: Figure 2 As shown; then, the special-shaped steel segment 17 is installed on the reference ring 2 at the corresponding segment reference point 4 using the assembly machine. At the same time, it is observed whether the contact surface between the segment and the reference ring 2 is tight. If there is an angle between the inside and outside, the segment posture needs to be readjusted until the segment has no angle. Then, the shield machine propulsion cylinder 7 is extended at the corresponding position, and the thrust of the cylinder is applied to the segment, so that it is confined between the shield machine propulsion cylinder 7 and the reference ring 2 and keeps its position stable. After completion, the first special-shaped steel segment is installed.

[0038] In this embodiment, both the positioning connecting pin 3 and the positioning connecting pin 12 adopt the following... Figure 7 The structure shown mainly includes a cylindrical pin 15 and a frustum 16 used in conjunction with the reference point 4 of the tube segment on the reference ring 2. The frustum 16 facilitates alignment during assembly, while the cylindrical pin 15 uses an intermediate fit to restrict its radial movement, thereby achieving the purpose of positioning and ensuring the positioning connection accuracy between the reference ring 2 and the reaction frame 1, as well as the positioning connection accuracy between the special-shaped steel tube segment 9 and the reference ring 2.

[0039] 4) The remaining five irregularly shaped steel segments are installed sequentially according to their relative positions, with adjacent segments installed first. The installation method is basically the same as that of the first segment. The difference between assembling the remaining irregularly shaped steel segments and the first segment lies in the following: Figure 8 As shown, for each of the remaining irregular steel pipe segments to be installed, the position between two adjacent irregular steel pipe segments must first be stabilized by spring cylindrical pins 14, and then the adjacent pipe segments are fixed by pipe segment connecting bolts 13 to prevent relative displacement between them, thereby reducing the relative deviation of the position between each pipe segment during the assembly process; finally, each pipe segment is stabilized by shield machine propulsion cylinders 7.

[0040] 5) After the six segments are installed, use a feeler gauge to measure the connection between each segment and the connection between the ring of shaped steel segments 9 and the reference ring 2. Ensure the gap is below 0.5mm. If it exceeds 0.5mm, the shaped steel segments 9 must be dismantled and reassembled until the desired shape is achieved. The final ring formation should ensure the roundness error of the first ring of shaped steel segments is within ±1mm. The ringed shaped steel segments 9 are then erected on the shield tunneling machine launcher 10. Figure 9 As shown.

[0041] In this embodiment, as Figure 9 As shown, the special-shaped steel segment 9 adopts a special-shaped widening design, which corresponds to the local segment width reduction at the tail seal brush 8. The width of the remaining segments matches the tail of the shield machine. On the one hand, it is not affected by the tail seal brush 8 during assembly, and on the other hand, it can be installed in one step within the stroke range of the assembly machine, which is conducive to improving construction efficiency while ensuring construction quality.

[0042] In the specific implementation of this embodiment: as follows: Figure 3 As shown, dismantling and hoisting points 11 are set on the special-shaped steel pipe segments. After the special-shaped steel pipe segment 9 is used as a negative ring segment and the connection between it and the reference ring 2 and the connection between each special-shaped steel pipe segment segment is released, it can be hoisted through the dismantling and hoisting points 11 to facilitate dismantling operations.

[0043] 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 using negative ring segments to improve roundness, characterized in that: The system includes a reference ring and steel tubing segments. The steel tubing segments are pin-connected to the reference ring. Each steel tubing segment is composed of several sections, each section connected to the reference ring via positioning pins. Adjacent sections are connected to each other to form a complete ring of steel tubing segments with a roundness matching the reference ring. Adjacent sections are connected as a whole by spring-loaded cylindrical pins and tubing connection bolts. The spring-loaded cylindrical pins are used for positioning between the sections, and the tubing connection bolts are used to secure them together. The steel pipe segments are connected and fastened to form a whole; the reference ring is provided with a wing plate for connecting with the reaction frame, and the wing plate has a connection hole; the reference ring is provided with a pipe segment reference hole for connecting with each of the steel pipe segments; the positioning connecting pin includes a cylindrical pin and a frustum, the frustum is used for positioning between the steel pipe segment and the reference ring, and the cylindrical pin and the frustum adopt a transition fit; the steel pipe segments are special-shaped steel pipe segments, and the width of the special-shaped steel pipe segments corresponds to the local segment width reduction at the tail sealing brush of the shield, while the width of the remaining segments matches the tail of the shield machine; The method of use includes the following steps: The reference ring is fixed to the reaction frame used for shield tunneling initiation construction; Assemble and debug the tunnel boring machine so that there is a certain distance between the tail of the tunnel boring machine and the reference ring; The first steel segment is connected to the reference ring. After adjustment, the shield machine propulsion cylinder extends from the corresponding position, so that the thrust of the shield machine propulsion cylinder acts on the steel segment. The remaining steel pipe segments are assembled sequentially according to their adjacent positions. After each steel pipe segment is connected to the reference ring, adjacent steel pipe segments are connected one by one and the shield machine propulsion cylinders extend from the corresponding positions until several steel pipe segments are assembled into a ring. When each steel pipe segment is installed into the reference ring, an assembly machine is used to install the steel pipe segment into the corresponding position of the reference ring, while ensuring that the steel pipe segment is in close contact with the reference ring. The assembly of the steel pipe segments involves first positioning and connecting the steel pipe segment to the reference ring and to the adjacent steel pipe segment, and then fastening the adjacent steel pipe segments together. The reference ring is milled from a single piece.

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