Micro-perturbation method for the rounding of shield tunnel segment structures

Abstract

The present invention relates to the field of repair methods for deformed tunnels, and specifically designs a method for rounding the segment structure of a shield tunnel with micro-disturbance. The invention aims to solve the problem of difficulty in repairing existing tunnel segments after deformation. The steps of the present invention include detecting the deformation of the segment inside the tunnel, pouring the grouting reinforcement body, and isolating the non-grouting space that is not in the grouting reinforcement body by intermittently intercepting the grouting liquid in the grouting reinforcement body. The non-grouting space is called the area to be grouted; the area to be grouted is filled with slurry that can drive the segment to rebound under pressure to achieve overall rounding. The advantages are: the reset adjustment of the deformed pipe segment can be stably and quickly realized, the cost is low, the efficiency is high, and the impact on the surrounding rock formation soil environment is minimal.

Description

Technical Field

[0001] The invention relates to the field of repair methods for deformed tunnels, and specifically designs a micro-disturbance shield tunnel segment structure rounding method. Background Art

[0002] In the field of tunnel construction, during the process of tunnel construction, the periphery is fixed with pipe segments, which is a conventional fixing method. However, after long-term use, the applicant found that the current pipe segments are prone to deformation after long-term use, and the deformation is very difficult to repair.

[0003] In actual work, the deformation of the pipe segment can be divided into many forms, including being widened on both sides, deforming the whole into an ellipse, and the front and rear deformations causing the entire longitudinal surface of the tunnel to sink. In the published patent application document, the application number is CN202210386268.8, entitled A method for grouting behind the wall of a shield tunnel segment. A technical method is disclosed. The method is specifically as follows: S1: When the shield equipment is digging the tunnel, the tunnel segment is laid closely following the shield equipment, and then the retractable transmission pipe is inserted between the tunnel segment and the tunnel soil wall, and the supply equipment is used to pass the concrete through the transmission pipe. S2: As the transmission pipe is infused, the wrapping bag at the end of the transmission pipe will expand, allowing the concrete to be shaped and solidified inside the wrapping bag; through this setting, the expanded concrete will enter the wrapping bag first, allowing all the wrapping bags to expand first to determine the basic shape. When the wrapping bag is expanded as a whole, the remaining concrete will expand and penetrate outward to fill the small gaps, which not only reduces the pressure of concrete on the pipe segment and the soil wall, but also reduces the problem of tunnel leakage caused by excessive pressure. At the same time, even if leakage occurs, the concrete will be blocked by the wrapping bag and will not leak on a large scale. However, this method only solves the problem of leakage and cannot repair deformation.

[0004] Furthermore, the application number is CN202210387965.5, named a simulation device and simulation method for shield tunnel segment deformation and surface settlement, which realizes effective prevention and control of the horizontal displacement of the shield tunnel segment through the telescopic structure limiter, uses the multi-layer stratum spring that can be freely disassembled at the bottom, and the upper part uses a high-precision displacement sensor to monitor the settlement deformation of multiple positions in the tunnel. After the shield tunnel segment is assembled, the position of the shield tunnel segment is fixed through the cooperation of the telescopic structure limiter and the shell assembly. However, since it is impossible to predict where the deformation will occur, the large-scale reserved equipment has increased the construction cost to a certain extent. Summary of the invention

[0005] The purpose of the present invention is to solve the problem in the prior art that the deformation of the tunnel segments after long-term use is difficult to repair, or the repair cost is high. The specific scheme of the present invention is: comprising the following steps: comprising the following steps:

[0006] (1) Detect the deformation of the segments inside the tunnel: Take the distance from the tangent point of each segment when the same component passes through a perfect circle as a reference, detect the deformation of other segments passing through, and reversely infer the deformation of the segment. When the segment undergoes lateral deformation, a rest area is marked on the surface above the outer side of the segment. A coordinate grid with an area greater than 2 square meters is drawn with a spacing of 10 to 50 cm. The intersection of the horizontal and vertical lines is the predetermined grouting pipe hole point. Drill in and out grouting holes that match the grouting pipe and have a minimum depth below the center plane position of the segment for standby use;

[0007] (2) Pouring grouting reinforcement body: Two kinds of mixed grouting slurries are pre-placed outside the site. The first grouting slurry is stirred evenly and then left to stand for 5 minutes. The grouting pipes are placed on each grouting hole in turn. At the beginning of a single grouting process, the slurry is pumped to flow to the grouting pipe. The bottom of the grouting pipe discharges the material in a single continuous manner in the form of squeezing cylindrical fluid and the outlet moves upward at a uniform speed, so as to form a number of grouting tubes assembled in rows / columns in the middle of the outer side of the pipe segment. The interval between the pouring process of each grouting tube is more than 10 minutes. The grouting tubes are combined to form a hoop-shaped grouting reinforcement body at both ends of the horizontal center line of the pipe segment;

[0008] (3) Casting grouting blocks: While performing step (2), a non-grouting space outside the grouting reinforcement body is isolated by intermittently retaining the grouting liquid in the grouting reinforcement body, and the non-grouting space is referred to as the waiting grouting area;

[0009] (4) Correction of rebound: The strength of the reinforcement body formed by the secondary grouting is lower than that of the reinforcement body formed by the primary grouting but higher than the strength of the pipe segment. The second grouting liquid is introduced into the area to be grouted by horizontal grouting or vertical grouting, which drives the pipe segment to rebound under pressure and realizes overall rounding.

[0010] Alternatively, step (2) is replaced by discharging the material indirectly in the form of stacking at the bottom of the grouting pipe, so as to form a plurality of grouting blocks stacked layer by layer in the middle of the outer side of the pipe segment, the pouring interval between each grouting block is more than 10 minutes, and each grouting block is combined to form a hoop-shaped grouting reinforcement body. The horizontal grouting includes setting up a grouting pipe passage inside the tunnel, the outer end of the grouting pipe passage is in the area to be grouted, and the vertical grouting includes reserving the grouting passage at the same time or by pre-burying the grouting pipe in steps (2) and (3).

[0011] In a specific implementation, the grouting barrel is in the shape of a cylindrical barrel with a radius less than 10 cm. The grouting reinforcement bodies appear in pairs on both sides of the deformed pipe segment, and the inner wall matches the outer contour of the deformed pipe segment.

[0012] In a specific implementation, the grouting block is a rectangular block with each edge less than 10 cm, or a spherical block with a diameter less than 10 cm, or a smooth column with each edge less than 10 cm and an edge chamfer less than 5 cm. The grouting reinforcement bodies appear in pairs on both sides of the deformed pipe segment, and the inner wall matches the outer contour of the deformed pipe segment.

[0013] In a specific implementation, a force rod is movably inserted on the grouting pipe, and a hydraulic lifting motor is installed on the force rod to drive the displacement of the force rod.

[0014] Alternatively, in the step, the second grouting liquid is replaced by an expansion material having a strength lower than that of the reinforcement body formed by the first grouting and higher than that of the pipe segment.

[0015] It also includes a horizontal bracket installed on the ground or above the ground, on which a mounting platform is installed to drive the grouting pipe to achieve swing displacement.

[0016] The mounting platform is of spherical crown type, including a bottom fixed platform and an upper rotating platform. A through hole is arranged on the arc top of the upper rotating platform, a sliding block is arranged in the arc-shaped slide groove formed by the through hole, and a clamping hole for installing a grouting pipe and a corresponding locking element are arranged on the sliding block.

[0017] .The locking hole is a square hole, and the corresponding locking element is a block of matching size, and the inner hole of the block matches the gap between the grouting pipe.

[0018] The beneficial effects of the present invention are:

[0019] The deformed pipe section can be quickly reset and adjusted with low cost and high efficiency;

[0020] The design of the grouting reinforcement body is convenient for temporary processing on site and adjustment at any time according to the situation. At the same time, the repaired pipe segment is fixed in a hoop-like manner. After forming and fixing, the internal secondary filling material is convenient for relatively stable force to be applied in the later stage, so that it can be deformed back to the original position. The whole process has little impact on the land and rock environment outside the grouting reinforcement body, which ensures the overall stability of the shield tunnel pipe segment structure to the greatest extent;

[0021] The design of the bracket provides mechanical constraints on one hand and mechanical guidance on the other hand. The overall deformation is flexible, and it is convenient for real-time adjustment of grouting and the clamp-type fixation.

[0022] The formation of the grouting reinforcement body is mainly based on a small amount of multiple pouring and assembly. The molding is flexible and it is easy to adjust the working conditions according to the site conditions in real time. At the same time, there is no dead angle in the pouring, which can be achieved through pressurized pouring, or under the guidance of auxiliary brackets, slight adjustments can be made by rotation and tilting. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1It is a stereogram of the structure of the present invention;

[0024] Figure 2 yes Figure 1 A front view of the structure shown;

[0025] Figure 3 yes Figure 1 a top view of the structure shown;

[0026] Figure 4 yes Figure 1 a left side view of the structure shown;

[0027] Figure 5 It is a structural diagram of the working state;

[0028] Figure 6 This Figure 5 A three-dimensional diagram of the grouting reinforcement structure used in the corresponding working state;

[0029] Figure 7 is a three-dimensional diagram of a grouting reinforcement structure used in a corresponding working state of another embodiment of the present invention;

[0030] The names of the components in the figure are: 1. Pipe segment; 2. Grouting reinforcement body; 3. Area to be grouted; 4. Grouting pipe; 5. Bottom fixed platform; 6. Upper rotating platform; 7. Sliding block; 8. Arc slide; 9. Clamp hole; 10. Pre-buried grouting pipe; 11. Horizontal grouting pipe; 12. Reserved grouting passage; 13. Hydraulic lifting motor; 14. Force rod; 15. Grouting barrel. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0032] Example 1

[0033] A micro-perturbation method for the rounding of shield tunnel segment structures, see Figures 1 to 6 , including the following steps: (1) detecting the deformation of the pipe segment 1 inside the tunnel: using the distance from the tangent point of each pipe segment 1 when the same component passes through a perfect circle as a reference, detecting the deformation of other pipe segments 1 passing through the tunnel, and inferring the deformation of the pipe segment 1 in reverse. When the pipe segment 1 undergoes lateral deformation, a rest area is demarcated on the surface above the outer side of the pipe segment 1, and a coordinate grid with an area greater than 2 square meters is drawn at intervals of 10 to 50 cm. The intersection point of the horizontal and vertical lines is the predetermined grouting pipe 4 hole point, and a grouting hole matching the grouting pipe 4 and with a minimum depth lower than the center plane position of the pipe segment 1 is drilled in and out for standby use;

[0034] (2) Pouring grouting reinforcement body: two kinds of mixed grouting slurries are pre-placed outside the site. The first grouting slurry is stirred evenly and then left to stand for 5 minutes. The grouting pipe 4 is placed on each grouting hole in turn. At the beginning of a single grouting process, the slurry is pumped to flow to the grouting pipe 4. The bottom of the grouting pipe 4 discharges the material in a single continuous manner in the form of squeezing cylindrical fluid and the outlet moving upward at a uniform speed, so as to form a number of grouting tubes 15 assembled in rows / columns in the middle of the outer side of the pipe segment 1. The interval between the pouring process of each grouting tube 15 is more than 10 minutes. The grouting tubes 15 are combined to form a hoop-shaped grouting reinforcement body 2 at both ends of the horizontal center line of the pipe segment 1;

[0035] (3) Casting grouting blocks: While performing step (2), a non-grouting space outside the grouting reinforcement body 2 is isolated by intermittently retaining the grouting liquid in the grouting reinforcement body 2, and the non-grouting space is referred to as the to-be-grouted area 3;

[0036] (4) Correction of rebound: The strength of the reinforcement body formed by the secondary grouting is lower than that of the reinforcement body formed by the primary grouting but higher than that of the segment 1. The second grouting liquid is introduced into the to-be-grouted area 3 by means of horizontal grouting or vertical grouting, driving the segment 1 to rebound under pressure, thereby achieving overall rounding.

[0037] The core idea of ​​the present invention is to first pre-process a pair of hoop-shaped reinforcement bodies on the outside of the deformed pipe segment. During the pouring process, a certain space is left between the cast body and the deformed hoop, and then the space is covered with filler to ensure that the extrusion force of the filler on the surrounding is concentrated in the form of divergence toward the pipe segment. At this time, since the strength of the pipe segment, the reinforcement body and the filler are all designed, the pressure or deformation of the filler drives the hoop to deform from an ellipse to an initial perfect circle. In the whole process, although there are many steps, the environmental impact on the surrounding soil and rock formations is extremely small, and the micro-disturbance described in the title can be achieved.

[0038] The grouting barrel 15 is in the shape of a cylindrical barrel with a radius less than 10 cm. The grouting reinforcement bodies 2 appear in pairs on both sides of the deformed pipe segment, and the inner wall matches the outer contour of the deformed pipe segment.

[0039] A force rod 14 is movably inserted on the grouting pipe 4, and a hydraulic lifting motor 13 is installed on the force rod 14 to drive the displacement thereof.

[0040] In the step (4), the second grouting liquid is replaced with an expansion material having a strength lower than that of the reinforcement body formed by the first grouting and higher than that of the segment 1.

[0041] It also includes a horizontal bracket installed on the ground or above the ground, on which a mounting platform is installed to drive the grouting pipe 4 to achieve swing displacement. It should be pointed out here that the mounting platform does not slurry out in a divergent shape with a point as the center, and secondly, it is modulated according to the coordinate point each time, and only fine-tuning is achieved when the coordinate point is not accurately positioned.

[0042] The mounting platform is a spherical crown type, including a bottom fixed platform 5 and an upper rotating platform 6. A through hole is arranged on the arc top of the upper rotating platform 6. A slider 7 is arranged in the arc-shaped slide groove 8 formed by the through hole. A clamping hole 9 and a corresponding locking element for installing the grouting pipe 4 are arranged on the slider 7. At the same time, the grouting bracket can also provide auxiliary support for the drill bit during the drilling process, and drill a slightly inclined hole to fill the dead angle below the two sides of the pipe segment 1.

[0043] Example 2

[0044] The principle of this embodiment is the same as that of embodiment 1, and the specific difference is that: alternatively, step (2) is replaced by the bottom of the grouting pipe 4 being stacked and indirectly discharged to form a plurality of grouting blocks stacked layer by layer in the middle of the outer side of the pipe segment 1, and the pouring interval between each grouting block is more than 10 minutes, and each grouting block is combined to form a hoop-shaped grouting reinforcement body 2. The horizontal grouting includes setting up a grouting pipe 4 passage inside the tunnel, and the outer end of the grouting pipe 4 passage is located in the area to be grouted 3, and the vertical grouting includes reserving a grouting passage 12 in steps (2) and (3) at the same time or by pre-burying the grouting pipe 10.

[0045] In this embodiment, the grouting block is a rectangular block with each edge less than 10 cm, or a spherical block with a diameter less than 10 cm, or a smooth column with each edge less than 10 cm and an edge chamfer less than 5 cm. The grouting reinforcement body 2 appears in pairs on both sides of the deformed pipe segment, and the inner wall matches the outer contour of the deformed pipe segment.

[0046] The clamping hole 9 is a square hole, and the corresponding locking element is a block of matching size, and the inner hole of the block is matched with the gap between the grouting pipe 4. It is convenient to lock when fixing is required, and to pull out and adjust when adjustment is required. It is convenient to form a square grouting block.

[0047] Finally, it should be noted that the above are only preferred embodiments of the present invention and are 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 can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A micro-disturbance shield tunnel segment structure rounding method, characterized in that: The steps include: (1) Detecting the deformation of the pipe segment (1) inside the tunnel: using the distance from the tangent point of each pipe segment (1) when the same component passes through a perfect circle as a reference, detect the deformation of other pipe segments (1) passing through the same circle, and infer the deformation of the pipe segment (1) in reverse. When the pipe segment (1) undergoes lateral deformation, a rest area is demarcated on the surface above the outer side of the pipe segment (1), and a coordinate grid with an area greater than 2 square meters is drawn at intervals of 10 to 50 cm. The intersection point of the horizontal and vertical lines is the predetermined grouting pipe (4) hole point, and a grouting hole matching the grouting pipe (4) and with a minimum depth lower than the center plane position of the pipe segment (1) is drilled in and out for standby use; (2) pouring the grouting reinforcement body (2): two kinds of mixed grouting slurries are pre-placed outside the site. The first grouting slurry is stirred evenly and then left to stand for 5 minutes. The grouting pipes (4) are placed on each grouting hole in turn. At the beginning of a single grouting process, the slurry is pumped to flow to the grouting pipe (4). The bottom of the grouting pipe (4) discharges the material in a single continuous manner in the form of squeezing a cylindrical fluid and the outlet moves upward at a uniform speed, so as to form a plurality of grouting cylinders (15) assembled in rows / columns in the middle of the outer side of the pipe segment (1). The interval between the pouring process of each grouting cylinder (15) is more than 10 minutes. The grouting cylinders (15) are combined to form a hoop-shaped grouting reinforcement body (2) at both ends of the horizontal center line of the pipe segment (1); (3) Casting the grouting block: While performing step (2), the grouting reinforcement body (2) is separated from the non-grouting space outside the grouting reinforcement body (2) by intermittently intercepting the grouting liquid. The non-grouting space is referred to as the waiting grouting area (3); (4) Correcting rebound: The strength of the reinforcement body formed by the secondary grouting is lower than the strength of the reinforcement body formed by the primary grouting and higher than the strength of the pipe segment (1). The second grouting liquid is introduced into the area to be grouted (3) by means of horizontal grouting or vertical grouting, driving the pipe segment (1) to rebound under pressure, thereby achieving overall rounding.

2. The micro-perturbation shield tunnel segment structure rounding method according to claim 1, characterized in that: Step (2) is replaced by discharging the material indirectly in the form of stacking at the bottom of the grouting pipe (4), so as to form a plurality of grouting blocks stacked layer by layer in the middle of the outer side of the pipe segment (1), the pouring interval between each grouting block is more than 10 minutes, and each grouting block is combined to form a hoop-shaped grouting reinforcement body (2).

3. The micro-perturbation shield tunnel segment structure rounding method according to claim 1 or 2, characterized in that: The horizontal grouting includes setting up a grouting pipe (4) passage inside the tunnel, the outer end of the grouting pipe (4) passage is located in the area to be grouting (3), and the vertical grouting includes reserving a grouting passage (12) in steps (2) and (3) at the same time or by pre-burying a grouting pipe (10).

4. The micro-perturbation shield tunnel segment structure rounding method according to claim 1, characterized in that: The grouting cylinder (15) is in the shape of a cylindrical barrel with a radius of less than 10 cm. The grouting reinforcement bodies (2) appear in pairs on both sides of the deformed pipe segment, and the inner wall matches the outer contour of the deformed pipe segment.

5. The micro-perturbation shield tunnel segment structure rounding method according to claim 2, characterized in that: The grouting block is a rectangular block with each edge less than 10 cm, or a spherical block with a diameter less than 10 cm, or a smooth column with each edge less than 10 cm and an edge chamfer less than 5 cm. The grouting reinforcement body (2) appears in pairs on both sides of the deformed pipe segment, and the inner wall matches the outer contour of the deformed pipe segment.

6. The micro-perturbation shield tunnel segment structure rounding method according to claim 1, characterized in that: A force-applying rod (14) is movably inserted on the grouting pipe (4), and a hydraulic lifting motor (13) is installed on the force-applying rod (14) to drive its displacement.

7. The micro-perturbation shield tunnel segment structure rounding method according to claim 1, characterized in that: In the step (4), the second grouting liquid is replaced with an expansion material having a strength lower than that of the reinforcement body formed by the first grouting and higher than that of the pipe segment (1).

8. The micro-perturbation shield tunnel segment structure rounding method according to claim 1, characterized in that: It comprises a horizontal support installed on the ground or above the ground, and a mounting platform is installed on the horizontal support so as to drive the grouting pipe (4) to achieve swing displacement.

9. The micro-perturbation shield tunnel segment structure rounding method according to claim 8, characterized in that: The mounting platform is of a spherical crown type, comprising a bottom fixed platform (5) and an upper rotating platform (6), a through hole being arranged at the arc top of the upper rotating platform (6), a sliding block (7) being arranged in an arc-shaped sliding groove (8) formed by the through hole, and a clamping hole (9) for mounting a grouting pipe (4) and a corresponding locking element being arranged on the sliding block (7).

10. The micro-perturbation shield tunnel segment structure rounding method according to claim 9, characterized in that: The locking hole (9) is a square hole, and the corresponding locking element is a square block of matching size, and the inner hole of the square block is gap-matched with the grouting pipe (4).

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