Special anti-floating duct piece system in shield tunnel

Abstract

The utility model relates to the technical field of shield tunnel duct pieces, and provides a special anti-floating duct piece system in a shield tunnel, which comprises a duct piece assembly comprising a plurality of arc-shaped special duct pieces, the plurality of special duct pieces are encircled and spliced into an annular pipeline, and hoisting holes are formed in the special duct pieces in a penetrating manner; supporting assemblies are connected to the outer sides of the hoisting holes in the backs of the special segments; the supporting assembly comprises a supporting plate, the supporting plate is an arc-shaped plate, the radian of the supporting plate is consistent with that of the special duct piece, and the supporting plate is connected with the interior of the hoisting hole through a bolt assembly; the bolt assembly comprises a grouting bolt, and the grouting bolt is arranged in the hoisting hole and used for secondary grouting. The shield tunnel duct piece can be prevented from floating upwards, the quality of a formed tunnel is improved, unnecessary construction cost is reduced, and economical efficiency and stability are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of shield tunnel segments, in particular to a special anti-floating segment system in a shield tunnel. Background Art

[0002] During subway shield construction, the rock formations across the entire section have poor permeability, resulting in a long slurry setting time. The buoyancy of the slurry causes the segments to float upward, which can easily lead to segment breakage, affecting the quality of the finished tunnel and increasing segment repair costs. After the segment bolts are pre-tightened, the tunnel segments float as a whole. Measuring the segment posture twice before and after the initial tack significantly impacts the measurement data, increases the number of re-measurements with the hanging basket, and increases the workload of the surveyors. This floating segment significantly impacts shield tunnel construction.

[0003] Therefore, in order to solve the above problems, a special anti-floating segment system in shield tunnels is proposed. Utility Model Content

[0004] Aiming at the deficiencies of the existing technology, the utility model develops a special anti-floating segment system in a shield tunnel, which can prevent the shield tunnel segments from floating up, improve the quality of the formed tunnel, reduce unnecessary construction costs, and improve economy and stability.

[0005] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical solutions:

[0006] A special anti-floating segment system in a shield tunnel, comprising:

[0007] The segment assembly includes several arc-shaped special segments, which are assembled into a circular pipe. The special segments are penetrated by lifting holes, and the outer sides of the lifting holes on the back of the special segments are connected to the support assembly.

[0008] The support assembly includes a support plate, which is connected to the lifting hole through a bolt assembly;

[0009] The bolt assembly includes a grouting bolt, which is arranged in the lifting hole and is used for secondary grouting.

[0010] Preferably, the support plate is configured as an arc-shaped plate, the curvature of which is consistent with the curvature of the special pipe segment.

[0011] Preferably, a support plate groove is provided on the outside of the lifting hole on the back of the special segment, and the shape and size of the support plate groove are consistent with the shape and size of the support plate.

[0012] Preferably, the bolt assembly further comprises a connecting bolt, which is coaxially arranged with the grouting bolt and is located at one end of the grouting bolt close to the support plate.

[0013] Preferably, the interior of the grouting bolt is hollow, and a grouting valve is provided at one end of the grouting bolt away from the connecting bolt.

[0014] Preferably, the interior of the connecting bolt is hollow, and a slurry outlet hole is provided through the side of the connecting bolt. A square hole is provided at one end of the connecting bolt close to the grouting bolt, and is connected to the interior of the grouting bolt through the square hole.

[0015] Preferably, a one-way valve is provided between the slurry outlet hole and the square hole. The one-way valve includes a spring and a top ball. The spring is provided in the connecting bolt, and the top ball is provided between one end of the spring close to the square hole and the square hole.

[0016] Preferably, the support assembly further comprises a rotating shaft, the axis of the rotating shaft being perpendicular to the plate surface of the support plate and arranged on the inner side of the support plate, the end of the rotating shaft away from the support plate being arranged on the connecting bolt, and the support plate being able to rotate around the axis of the rotating shaft.

[0017] The effects provided in the content of the utility model are only the effects of the embodiments, rather than all the effects of the utility model. The above technical solution has the following advantages:

[0018] 1. The utility model provides a support assembly and a bolt assembly. The support plate of the support assembly can contact the tunnel face in the shield tunnel and be pre-tightened and supported by connecting bolts to stabilize the position of the pipeline, prevent the pipe segment from floating in the slurry, reduce the breakage of the pipe segment, reduce the repair cost, and improve the economic efficiency of the construction.

[0019] 2. The present invention provides a rotation connection between the support plate and the connecting bolts via a rotating shaft, which allows the support plate to rotate at multiple angles, thereby ensuring fuller contact with the tunnel face and improving support stability.

[0020] 3. The utility model realizes secondary grouting by setting grouting bolts and one-way valves, avoiding the situation that the primary grouting may be insufficient, and realizes one-way flow of slurry through the one-way valve, avoiding the loss caused by slurry backflow, thereby improving the economy and safety of construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.

[0022] Figure 1 This is a schematic diagram of the unsupported structure of the special segment upper support assembly according to an embodiment of the utility model;

[0023] Figure 2 This is a schematic structural diagram of the support assembly on the special segment according to an embodiment of the present utility model;

[0024] Figure 3 A schematic diagram of the connection between the support assembly and the bolt assembly according to an embodiment of the present utility model;

[0025] Figure 4 This is a schematic structural diagram of a connecting bolt according to an embodiment of the present utility model;

[0026] Figure 5 This is a schematic cross-sectional structural diagram of a connecting bolt according to an embodiment of the present utility model.

[0027] In the figure, 1. special segment; 2. support assembly; 21. support plate; 22. rotating shaft; 23. connecting bolt; 24. grouting bolt; 25. grouting valve; 231. slurry outlet hole; 232. one-way valve; 233. square hole. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] like Figure 1-5 As shown, the utility model provides a technical solution:

[0030] A special anti-floating segment system in a shield tunnel includes: a segment assembly, including several arc-shaped special segments 1, multiple special segments 1 are assembled together to form a circular pipe, multiple lifting holes are opened through the special segments 1, and the outer sides of the lifting holes on the back of the special segments 1 are connected to the support assembly 2; the support assembly 2 includes a support plate 21, and the support plate 21 is connected to the lifting hole through a bolt assembly; the bolt assembly includes a grouting bolt 24, and the grouting bolt 24 is arranged in the lifting hole for secondary grouting.

[0031] In this embodiment, the support plate 21 is set as an arc-shaped plate, and its curvature is set to be consistent with the curvature of the special pipe segment 1, which facilitates the support of the support plate 21, increases the contact area between the support plate 21 and the shield tunnel face, and improves the stability of the support.

[0032] In this embodiment, a support plate groove is opened on the outside of the lifting hole on the back of the special pipe segment 1, and the shape and size of the support plate groove are set to be consistent with the shape and size of the support plate 21, so that the support plate 21 can be embedded in the support plate groove, avoiding the construction and installation affecting the pipe segment assembly or the assembly process to bump the support plate 21, thereby improving the quality of the formed pipe segment.

[0033] In this embodiment, the bolt assembly also includes a connecting bolt 23, which is used to connect and support the support assembly 2. The connecting bolt 23 and the grouting bolt 24 can be coaxially arranged in the lifting hole, and the connecting bolt 23 and the grouting bolt 24 are both threadedly connected to the lifting hole. The connecting bolt 23 is located at one end of the grouting bolt 24 close to the support plate 21. By rotating the connecting bolt 23, the connecting bolt 23 is unscrewed to pre-tighten the support plate 21 and the shield tunnel face, so that the annular pipe surrounded by the special pipe segment 1 will not move due to buoyancy, thereby achieving safe construction and improving economy.

[0034] In this embodiment, the interior of the grouting bolt 24 is set to be hollow, and a grouting valve 25 is set at the end of the grouting bolt 24 away from the connecting bolt 23. The outside of the grouting valve 25 can be connected to the slurry transmission equipment to inject slurry into the grouting bolt 24 to achieve secondary grouting, thereby improving the practicality of the device.

[0035] In this embodiment, the interior of the connecting bolt 23 is set to be hollow, and a slurry outlet hole 231 is provided on the side of the connecting bolt 23 for discharging slurry. A square hole 233 is provided at one end of the connecting bolt 23 close to the grouting bolt 24, and is connected to the interior of the grouting bolt 24 through the square hole 233. The square hole 233 is square at one end close to the grouting bolt 24, which facilitates the insertion of tools and drives the connecting bolt 23 to rotate in the lifting hole. The tool can be a pneumatic wrench to facilitate unscrewing the connecting bolt 23 and supporting the support plate 21, thereby improving the practicality of the device.

[0036] In this embodiment, a one-way valve 232 is arranged between the slurry outlet hole 231 and the square hole 233. The one-way valve 232 includes a spring and a top ball. The spring is arranged in the connecting bolt 23, and the top ball is arranged between the end of the spring close to the square hole 233 and the square hole 233. The end of the square hole 233 away from the grouting bolt 24 is set to be circular, which is convenient for the placement of the top ball, so that there is no gap between the top ball and the square hole 233, thereby avoiding the leakage of slurry and improving the safety and economy of the device.

[0037] In this embodiment, the support assembly 2 also includes a rotating shaft 22, the axis of the rotating shaft 22 is perpendicular to the plate surface of the support plate 21 and is arranged on the inner side of the support plate 21, preferably connected by a bearing, and the end of the rotating shaft 22 away from the support plate 21 is arranged on the connecting bolt 23. The support plate 21 can rotate around the axis of the rotating shaft 22 to more fully contact the face of the shield tunnel, thereby avoiding the support plate 21 being stuck by gravel and causing the connecting bolt 23 to be unable to fully pre-tighten the support plate 21, thereby improving the stability of the device.

[0038] In this embodiment, the pipe segment assembly also includes a number of conventional concrete pipe segments. The curvature of the conventional pipe segments is consistent with that of the special pipe segments 1, and they can be enclosed and spliced ​​into a circular conventional pipe. During construction, a special pipe composed of 2 to 3 rings of special pipe segments 1 is arranged between a certain number of conventional pipes, and the conventional pipes and the special pipes are connected as a whole. The connection method can adopt conventional connections in this field, so that when the support assembly 2 on the special pipe segment 1 is in effect, neither the conventional pipe nor the special pipe will float up. Compared with the use of special pipes for all connections, the construction cost is reduced and the economy is improved.

[0039] In another embodiment, the special segment 1 can be configured as a conventional segment with a support plate groove provided on the back of the segment, which is simpler to manufacture and improves the economy of construction.

[0040] Working principle: First, the support plate 21 and the connecting bolt 23 are connected as a whole through the rotating shaft 22. The special pipe segment 1 is brought into the site, and the support plate 21 is set in the support plate groove outside the lifting hole on the back of the special pipe segment 1. Specifically, the connecting bolt 23 is threadedly connected to the lifting hole, and the support plate 21 is engaged with the support plate groove. The arc-shaped outer surface of the support plate 21 is flush with the surface of the back of the special pipe segment 1. According to the on-site construction requirements, multiple groups of support components 2 are set; then the special pipe segment 1 is enclosed into a special pipe, the conventional pipe segment is enclosed into a conventional pipe, and 2 to 3 rings of special pipes are set between a certain number of conventional pipes, and the conventional pipes and the special pipes are connected as a whole and set in the shield tunnel; then the support is pre-tightened, and the connecting bolt 23 is unscrewed by a tool. Specifically, a pneumatic wrench can be used with the square hole 2 of the connecting bolt 23 33 unscrews the connecting bolt 23, and makes the connecting bolt 23 drive the support plate 21 to approach and contact the tunnel face of the shield tunnel, and appropriately adjusts multiple groups of connecting bolts 23 and support components 2 so that the support plate 21 and the tunnel face are pre-tightened effectively to prevent movement. At the same time, the support plate 21 can achieve 360-degree rotation through the rotating shaft 22 to more fully contact the tunnel face and improve stability. After pre-tightening, the slurry hole 231 on the connecting bolt 23 is exposed, and the grouting bolt 24 is installed before the secondary grouting. The grouting bolt 24 is threadedly connected to the lifting hole and contacts the bottom of the connecting bolt 23. The grouting liquid is passed into the grouting bolt 24 through the grouting valve 25. The slurry flows along the grouting bolt 24 to the connecting bolt 23, and pushes open the top ball of the one-way valve 232, and flows out through the slurry hole 231. The spring of the one-way valve 232 prevents the slurry behind the wall from flowing back from the slurry hole 231.

[0041] Anything not described in detail in the present invention is a conventional technical means known to those skilled in the art.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more such features. In the description of this utility model, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0044] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

[0045] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A special anti-floating segment system in a shield tunnel, characterized by: include: The pipe segment assembly comprises a plurality of arc-shaped special pipe segments (1), wherein the plurality of special pipe segments (1) are assembled to form a circular pipe, and the special pipe segments (1) are provided with hanging holes, and the outsides of the hanging holes on the back of the special pipe segments (1) are connected to the support assembly (2); The support assembly (2) includes a support plate (21), and the support plate (21) is connected to the lifting hole via a bolt assembly; The bolt assembly comprises a grouting bolt (24), which is arranged in the hoisting hole and is used for secondary grouting.

2. The special anti-floating segment system in a shield tunnel according to claim 1, characterized in that: The support plate (21) is configured as an arc-shaped plate, the curvature of which is consistent with the curvature of the special tube segment (1).

3. The special anti-floating segment system in a shield tunnel according to claim 2, characterized in that: A support plate groove is provided on the outside of the lifting hole on the back of the special pipe segment (1), and the shape and size of the support plate groove are consistent with the shape and size of the support plate (21).

4. The special anti-floating segment system in a shield tunnel according to claim 3, characterized in that: The bolt assembly further comprises a connecting bolt (23), which is coaxially arranged with the grouting bolt (24) and is located at one end of the grouting bolt (24) close to the support plate (21).

5. The special anti-floating segment system in a shield tunnel according to claim 4, characterized in that: The grouting bolt (24) is hollow inside, and a grouting valve (25) is provided at one end of the grouting bolt (24) away from the connecting bolt (23).

6. The special anti-floating segment system in a shield tunnel according to claim 5, characterized in that: The connecting bolt (23) is hollow inside, and a slurry outlet hole (231) is formed through the side of the connecting bolt (23). A square hole (233) is formed at one end of the connecting bolt (23) close to the grouting bolt (24), and the connecting bolt (23) is connected to the inside of the grouting bolt (24) through the square hole (233).

7. The special anti-floating segment system in a shield tunnel according to claim 6, characterized in that: A one-way valve (232) is provided between the pulp outlet hole (231) and the square hole (233). The one-way valve (232) comprises a spring and a top ball. The spring is provided in the connecting bolt (23), and the top ball is provided between one end of the spring close to the square hole (233) and the square hole (233).

8. The special anti-floating segment system in a shield tunnel according to claim 7, characterized in that: The support assembly (2) further comprises a rotating shaft (22), the axis of the rotating shaft (22) being perpendicular to the plate surface of the support plate (21) and arranged on the inner side of the support plate (21), and one end of the rotating shaft (22) away from the support plate (21) being arranged on a connecting bolt (23), so that the support plate (21) can rotate around the axis of the rotating shaft (22).

Images