Shield segment hoisting hole pre-burying structure

Abstract

This invention relates to the field of subway tunnel construction technology, and discloses a pre-embedded structure for shield tunnel segment hoisting holes. The pre-embedded structure includes an embedded component installed within the shield tunnel segment installation hole. The embedded component comprises a connected grouting spiral pipe and a grouting straight pipe, with the length of the grouting spiral pipe increased while maintaining the total length of the embedded component. A spiral reinforcing bar is installed within the shield tunnel segment installation hole. A tie bar is provided inside the spiral reinforcing bar, welded to the spiral reinforcing bar, and connected to the main reinforcement and distribution reinforcement of the tunnel segment to form a coordinated force-bearing system. A second tie bar is provided outside the grouting straight pipe, with a hook-shaped lower connecting bar at its lower part. This invention has a simple structure, is easy to operate, and has low production costs. It can significantly improve the pull-out bearing capacity of the overall structure of the embedded component, reduce the safety risks of shield tunnel segment hoisting and installation, and solve the problems of insufficient pull-out bearing capacity and easy overall detachment accidents in existing shield tunnel segment hoisting hole pre-embedded components.

Description

Technical Field

[0001] This invention relates to the field of subway tunnel construction technology, and in particular to a safe and reliable pre-embedded structure for shield tunnel segment hoisting holes. Background Technology

[0002] The primary construction method for subway tunnel sections is the shield tunneling method. During shield tunneling, segments need to be frequently lifted and installed through the segment hoisting holes. Therefore, the overall safety and reliability of the embedded parts in the segment hoisting holes are crucial. According to the existing technical solution, the spiral pipe of the embedded part is 178mm long, the straight pipe is 103mm long, and the number of threads screwed into the spiral pipe by the lifting head during hoisting is 8. The spiral reinforcement at the embedded part is made of D6 plain round steel bars, with a diameter of 140mm and a pitch of 70mm. Although pull-out tests have verified that it meets the specification requirement of "pull-out force not less than 7 times the self-weight of the segment," accidents still occur during on-site segment installation. In these accidents, the embedded parts and surrounding concrete are pulled out as a whole, seriously endangering the safety of on-site construction personnel and machinery. Summary of the Invention

[0003] This invention aims to overcome the shortcomings of existing technologies and provide a safe and reliable pre-embedded structure for shield tunnel segment hoisting holes. By optimizing the structure of the pre-embedded component and the surrounding reinforcement, this invention significantly improves the overall pull-out bearing capacity of the pre-embedded component, reducing the safety risks during shield tunnel segment hoisting and installation. Simultaneously, the new solution balances production feasibility and cost-effectiveness, adapting to the application needs of large-scale construction scenarios. It solves the problems of insufficient pull-out bearing capacity and the susceptibility to overall detachment accidents associated with existing pre-embedded components for shield tunnel segment hoisting holes.

[0004] The technical solution adopted by this invention to solve its technical problem is: An embedded structure for a shield tunnel segment hoisting hole includes an embedded component installed inside the shield tunnel segment mounting hole. The embedded component includes a grouting spiral pipe and a grouting straight pipe connected together. The grouting straight pipe is connected to the grouting spiral pipe. The length of the grouting spiral pipe is increased while maintaining the total length of the embedded component. A coaxially arranged spiral reinforcing bar is installed inside the shield tunnel segment mounting hole. A tie reinforcing bar is provided inside the spiral reinforcing bar, parallel to the axis of the shield tunnel segment mounting hole. The embedded component is located inside the tie reinforcing bar. The tie reinforcing bar is welded to the spiral reinforcing bar. The tie reinforcing bar is connected to the main reinforcing bar or distribution reinforcing bar of the tunnel segment at the intersection, forming a cooperative force-bearing system.

[0005] The upper part of the tie bar is connected to an outwardly extending upper horizontal connecting bar, which is tied to the upper main reinforcement or distribution reinforcement of the pipe segment.

[0006] The lower part of the tie bar 1 is connected to an outwardly extending lower connecting bar 1. The lower connecting bar 1 is horizontally arranged and vertically connected to the lower tie bar 1, or it is inclined outward and upward at a predetermined angle and connected to the lower part of the tie bar 1 through an arc-shaped part.

[0007] The spiral steel bar is a ribbed spiral steel bar, and the tie bar is a ribbed steel bar. There are multiple tie bars, which are evenly distributed around the embedded part.

[0008] The spiral steel bar has a diameter of 140mm and a pitch of 70mm.

[0009] The outer side of the grouting straight pipe is provided with lower tie bars II. The diameter of the grouting straight pipe is smaller than the diameter of the grouting spiral pipe. The lower part of the tie bars II is provided with an outwardly extending lower connecting bar II.

[0010] The grouting straight pipe is a steel pipe, and the tie bar II is welded to the grouting straight pipe. The lower connecting bar II is in a horizontal position and is vertically connected to the lower part of the tie bar II, or it is inclined to the outside and upward at a predetermined angle and connected to the lower part of the tie bar II through an arc-shaped part to form a fishhook-shaped structure. The lower connecting bar II is connected to the lower main reinforcement of the tunnel segment or the distribution reinforcement of the shield tunnel segment.

[0011] The total length of the embedded part is 281mm, the length of the spiral pipe is 216mm, and the number of threads that the lifting head screws into the embedded part during hoisting is 11.

[0012] The lower part of the grouting spiral pipe is equipped with a one-way check valve through a threaded connection. A sealing ring 1 is provided on the sealing end face of the grouting straight pipe and the grouting spiral pipe. A grouting pipe plug is installed on the upper part of the grouting spiral pipe, and a sealing ring 2 is installed on the grouting pipe plug. The grouting pipe plug is sealed and connected to the upper opening of the grouting spiral pipe through the sealing ring 2.

[0013] The beneficial effects of this invention are: 1. This invention significantly improves pull-out bearing capacity: This invention significantly improves the overall pull-out bearing capacity of embedded parts through a dual structural scheme: increasing the length of the spiral tube to increase the number of threaded engagements, and strengthening the reinforcement structure to form a synergistic force-bearing system. Tests have verified that the embedded parts using this dual optimization scheme have an ultimate pull-out bearing capacity greater than 490KN, far exceeding the standard requirement of 290KN (i.e., 7 times the self-weight of the tunnel segment; shield tunnel segment outer diameter 6.4m, inner diameter 5.8m, width 1.5m), fundamentally preventing the occurrence of overall embedded part detachment accidents during hoisting operations.

[0014] 2. This invention significantly enhances safety and stability: By increasing the number of threaded engagements, the embedded parts of this invention effectively improve the connection stability between the lifting head and the embedded parts, reducing stress concentration during lifting. Through the addition of a reinforced structural design, the welding and fixing of the spiral reinforcement to the inner tie bars, and the tying and fixing of the inner tie bars to the main or distribution bars of the tunnel segment, a stable and synergistic stress-bearing system is formed, significantly enhancing the bond strength between the embedded parts and the tunnel segment concrete. This completely avoids the problem of the concrete around the embedded parts being pulled out as a whole during lifting.

[0015] 3. The present invention has a simple structure, convenient production operation, low production cost, and excellent convenience and economy: The present invention adjusts the length of the embedded parts, the specifications and arrangement of the steel bars without changing the overall production process of the tunnel segments, which reduces the difficulty of production and processing. No additional replacement of the hoisting head is required during construction. It can effectively control the construction cost and ensure production efficiency. It can directly adapt to and meet the requirements of the existing large-scale tunnel segment production and construction process.

[0016] 4. The second lower connecting bar of the present invention is in a horizontal position and is vertically connected to the lower part of the second tie bar, or it is inclined to the outside and upward at a predetermined angle and connected to the lower part of the second tie bar through an arc-shaped part to form a fishhook-shaped structure. The second lower connecting bar is connected to the main reinforcement of the lower segment or the distribution reinforcement of the shield segment, which increases the bonding strength between the embedded part and the segment concrete, resulting in more balanced stress, higher overall strength, and significantly improved overall pull-out bearing capacity of the embedded part. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 Schematic diagram of the location and connection structure of the pre-embedded structure for the shield tunnel segment hoisting hole Figure 1 ; Figure 2 Schematic diagram of the location and connection structure of the pre-embedded structure for the shield tunnel segment hoisting hole Figure 2 ; Figure 3 Schematic diagram of embedded parts Figure 1 ; Figure 4 Schematic diagram of embedded parts Figure 2 .

[0018] In the diagram, 1. Embedded part, 11. Grouting spiral pipe, 12. Grouting straight pipe, 2. Main reinforcement of pipe segment, 3. One-way check valve, 4. Sealing ring one, 5. Grouting pipe plug, 6. Spiral reinforcement, 7. Tie reinforcement one, 71. Horizontal connecting reinforcement, 72. Lower connecting reinforcement one, 8. Tie reinforcement two, 81. Lower connecting reinforcement two, 82. Arc-shaped part, 9. Sealing ring two, 10. Distribution reinforcement. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. A safe and reliable pre-embedded component for shield tunnel segment hoisting holes and its reinforcement method.

[0020] like Figure 1-4 As shown, a pre-embedded structure for a shield tunnel segment hoisting hole includes an embedded component 1, which is installed inside the shield tunnel segment mounting hole. The embedded component includes a grouting spiral pipe 11 and a grouting straight pipe 12 connected together. The grouting spiral pipe 11 is made of plastic or steel. The grouting straight pipe 12 is connected to the grouting spiral pipe 11, either by a snap-fit ​​connection or by a threaded connection. A one-way check valve 3 is installed at the lower part of the grouting spiral pipe 11 via a threaded connection. A sealing ring 4 is provided on the sealing end face of the grouting straight pipe and the grouting spiral pipe. A grouting pipe plug 5 is installed on the upper part of the grouting spiral pipe, and a second sealing ring is installed on the grouting pipe plug 5. 9. The grouting pipe plug 5 is sealed to the upper opening of the grouting spiral pipe 11 through sealing ring 2 9. While maintaining the total length of the embedded part (i.e., the grouting spiral pipe and the grouting straight pipe), the length of the grouting spiral pipe 11 is increased. A coaxial spiral steel bar 6 is installed inside the shield tunnel segment installation hole. A tie steel bar 7, parallel to the axis of the shield tunnel segment installation hole, is provided inside the spiral steel bar 6. The embedded part 1 is located inside the tie steel bar 7. The tie steel bar 7 is welded to the spiral steel bar 6. The tie steel bar 7 is connected to the main reinforcement 2 or distribution reinforcement 10 of the tunnel segment at the intersection, forming a cooperative force-bearing system. This significantly improves the overall pull-out bearing capacity of the embedded part. Tests have verified that the embedded parts of this invention, which employ a dual optimization scheme, have an ultimate pull-out bearing capacity greater than 490KN, far exceeding the standard requirement of 290KN (i.e., 7 times the self-weight of the tunnel segment; the outer diameter of the shield tunnel segment is 6.4m, the inner diameter is 5.8m, and the width is 1.5m). This can fundamentally prevent the occurrence of accidents where the embedded parts fall off completely during hoisting operations.

[0021] The upper part of the tie bar 7 is connected to an outwardly extending upper horizontal connecting bar 71, which is tied to the upper main bar or distribution bar 10 of the pipe segment.

[0022] The lower part of the tie bar 7 is connected to an outwardly extending lower connecting bar 72. The lower connecting bar 72 is in a horizontal position and is vertically connected to the lower tie bar 7, or it is inclined outward and upward at a predetermined angle and connected to the lower part of the tie bar 7 through an arc-shaped part. If it forms an inclined position at an appropriate angle to the horizontal, the lower connecting bar 72 is then tied to the main bar 2 or distribution bar 10 of the pipe segment near the lower part if necessary.

[0023] The spiral reinforcement 6 is a ribbed spiral reinforcement, and the tie reinforcement 7 is a ribbed reinforcement. Multiple tie reinforcements 7 are provided and are evenly distributed around the embedded part 1. For example, the tie reinforcement 7 may be four D8 steel bars, which are firmly welded to the spiral reinforcement and tied to the main reinforcement 2 or distribution reinforcement 10 of the segment to form a cooperative stress-bearing structural system.

[0024] The spiral steel bar 6 is a D8 spiral bar with a diameter of 140mm and a pitch of 70mm.

[0025] The grouting straight pipe 12 is a steel pipe. Multiple tie bars 8 are evenly distributed on the outer side of the grouting straight pipe 12. The diameter of the grouting straight pipe 12 is smaller than the diameter of the grouting spiral pipe 11. A lower connecting bar 81 extending outwards is provided at the lower part of the tie bars 8. The lower connecting bar 81 can adopt a structure similar to the lower connecting bar 72. That is, the lower connecting bar 81 is horizontal and vertically transitions to the lower part of the tie bars 8, or it is inclined upwards and outwards at a predetermined angle and connected to the lower part of the tie bars 8 through an arc-shaped portion 82 to form a fishhook-like shape. The lower connecting bar 81 is connected to the lower main reinforcement 2 or distribution reinforcement 10 of the pipe segment.

[0026] Furthermore, the total length of the embedded part for the shield tunnel segment hoisting hole of this invention is 281mm, of which the spiral pipe is 216mm long and the straight pipe is 65mm long, ensuring that the number of threads screwed into the embedded part by the lifting head during hoisting is 11. By increasing the number of thread engagements, the embedded part effectively improves the connection stability between the lifting head and the embedded part, reduces the stress concentration phenomenon during hoisting, and significantly enhances safety and stability. By adding a reinforced reinforcement structure, welding and fixing the spiral reinforcement to the inner tie reinforcement, and tying and fixing the inner tie reinforcement to the main reinforcement 2 or distribution reinforcement 10 of the segment, a stable and cooperative force-bearing system is formed, which significantly enhances the bonding strength between the embedded part and the segment concrete, and can completely avoid the problem of the concrete around the embedded part of the segment being pulled out as a whole during hoisting.

[0027] In the description of this invention, the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only to describe the invention and not to require the invention to be constructed or operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected" and "linked" in this invention should be interpreted broadly. For example, they can refer to a connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms based on the specific circumstances.

[0028] The above description represents preferred embodiments of the present invention. The specific embodiments are provided solely for a better understanding of the invention's concept. Those skilled in the art can make various improvements or equivalent substitutions based on the principles of the present invention, and these improvements or equivalent substitutions are also considered to fall within the scope of protection of the present invention.

Claims

1. A pre-embedded structure for a shield tunnel segment hoisting hole, comprising an embedded component installed within the shield tunnel segment mounting hole, including a grouting spiral pipe and a grouting straight pipe connected together, the grouting straight pipe being connected to the grouting spiral pipe, characterized in that... While keeping the total length of the embedded parts unchanged, the length of the grouting spiral pipe is increased. A spiral steel bar is installed coaxially in the shield segment installation hole. A tie steel bar is provided on the inner side of the spiral steel bar, which is parallel to the axis of the shield segment installation hole. The embedded parts are located inside the tie steel bar. The tie steel bar is welded to the spiral steel bar. The tie steel bar is connected to the main reinforcement of the segment and the distribution reinforcement of the shield segment at the intersection to form a cooperative force-bearing system.

2. The pre-embedded structure for shield tunnel segment hoisting holes according to claim 1, characterized in that, The upper part of the tie bar is connected to an outwardly extending upper horizontal connecting bar, which is tied to the upper main reinforcement of the tunnel segment or the distribution reinforcement of the shield tunnel segment.

3. The pre-embedded structure for shield tunnel segment hoisting holes according to claim 2, characterized in that, The lower part of the tie bar 1 is connected to an outwardly extending lower connecting bar 1. The lower connecting bar 1 is horizontally arranged and vertically connected to the lower tie bar 1, or it is inclined outward and upward at a predetermined angle and connected to the lower part of the tie bar 1 through an arc-shaped part.

4. The pre-embedded structure for shield tunnel segment hoisting holes according to claim 3, characterized in that, The spiral steel bar is a ribbed spiral steel bar, and the tie bar is a ribbed steel bar. There are multiple tie bars, which are evenly distributed around the embedded part.

5. The pre-embedded structure for shield tunnel segment hoisting holes according to claim 1, characterized in that, The spiral steel bar has a diameter of 140mm and a pitch of 70mm.

6. The pre-embedded structure for shield tunnel segment hoisting holes according to claim 2, characterized in that, The outer side of the grouting straight pipe is provided with lower tie bars II. The diameter of the grouting straight pipe is smaller than the diameter of the grouting spiral pipe. The lower part of the tie bars II is provided with an outwardly extending lower connecting bar II.

7. The pre-embedded structure for shield tunnel segment hoisting holes according to claim 6, characterized in that, The grouting straight pipe is a steel pipe, and the tie bar II is welded to the grouting straight pipe. The lower connecting bar II is in a horizontal position and is vertically connected to the lower part of the tie bar II, or it is inclined to the outside and upward at a predetermined angle and connected to the lower part of the tie bar II through an arc-shaped part to form a fishhook-shaped structure. The lower connecting bar II is connected to the lower main reinforcement of the tunnel segment or the distribution reinforcement of the shield tunnel segment.

8. The pre-embedded structure for shield tunnel segment hoisting holes according to claim 1, characterized in that, The total length of the embedded part is 281mm, the length of the grouting spiral pipe is 216mm, and the number of threads that the lifting head is screwed into the embedded part during hoisting is 11.

9. The pre-embedded structure for shield tunnel segment hoisting holes according to claim 1, characterized in that, The lower part of the grouting spiral pipe is equipped with a one-way check valve through a threaded connection. A sealing ring 1 is provided on the sealing end face of the grouting straight pipe and the grouting spiral pipe. A grouting pipe plug is installed on the upper part of the grouting spiral pipe, and a sealing ring 2 is installed on the grouting pipe plug. The grouting pipe plug is sealed and connected to the upper opening of the grouting spiral pipe through the sealing ring 2.

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