CN112065457A - Stage-by-stage movable subway interval tunnel shield segment reinforcing method - Google Patents

Abstract

The invention relates to a step-by-stage movable shield tunnel segment reinforcement method for subway section tunnels. During tunnel construction in the subway section, arc-shaped components are pre-buried between the shield segment and the ballast bed, and are cast integrally with the ballast bed; arc-shaped components are also used for the shield segment above the ballast bed in the section affected by external interference. And it is connected with the embedded circular arc-shaped member to form a whole ring structure for reinforcement; after the external interference factors are eliminated, the arc-shaped member above the ballast bed can be removed and moved to the next section to continue. Implement reinforcement. Due to the uncertainty of external interference factors, in the present invention, the pre-embedded circular arc-shaped member at the bottom of the track bed and the removable circular-arc-shaped member at the top of the track bed are used for reinforcement in stages. Therefore, the corresponding position can be selected according to the actual external interference. Reinforcement of the sheet is implemented, shortening the construction period of reinforcement, and greatly reducing the cost of the project.

Description

A step-by-step method for strengthening shield segments of movable subway tunnels

technical field

The invention relates to the technical field of urban rail transit construction, and is particularly suitable for a method for reinforcing tunnels in subway shield tunnels.

Background technique

At present, with the rapid development and construction of urban rail transit, subway tunnels are inevitably affected by the construction of adjacent buildings. During the construction in the vicinity of the subway tunnel, the excavation of the covering soil and the construction of the bridge pile foundation may have an impact on the deformation of the subway tunnel. Excessive deformation will lead to water leakage, structural cracking, rail surface Problems such as elevation and geometric dimensions that do not meet the requirements of track operation have an impact on the normal operation of the subway.

In the prior art, there are mainly two types of protection technologies for the stability of existing subway shield tunnels under adjacent construction conditions. One is to take measures in the adjacent construction process, often adopting measures such as driving protective piles and setting filling materials on the paths that have an impact on the stability of the tunnel. Such measures are often restricted by actual conditions, and the project investment and implementation are difficult, and they often fail to achieve good application results. Another method is to take measures on the existing subway tunnel itself, for example, temporarily strengthening the shield segment of the tunnel in the sensitive section of the external disturbance, often using half-ring steel ring reinforcement inside the segment. Since it is difficult to accurately locate the sensitive section of external interference during construction, when the segment is reinforced after the tunnel is completed, only half-ring reinforcement can be performed on the part above the track bed, and a closed full-ring cannot be formed, and the reinforcement effect is limited.

SUMMARY OF THE INVENTION

The purpose of the present invention is to aim at the defects and deficiencies of the above-mentioned traditional subway tunnel reinforcement technology, and provide a kind of movable reinforcement method inside the shield segment with simple construction, low construction cost and fast construction for the safety protection of subway shield tunnels. The method can not only reduce the impact of external disturbance on the stability of the tunnel, reduce the later tunnel disease, but also flexibly move and reinforce according to the change of the affected section.

In order to achieve the above purpose, the present invention proposes a step-by-step movable subway shield tunnel reinforcement method, which is characterized by comprising the following steps:

1) The arc-shaped components are prefabricated in the factory. The arc-shaped components can be composed of composite materials such as metal and high-strength fibers. The arc-shaped components are divided into pre-embedded arc-shaped components (2) at the bottom of the track bed and removable arc-shaped components (3, 4, 5, 6, 7) at the top of the track bed. The pre-embedded arc-shaped member (2) in the lower part of the bed and the removable arc-shaped member (3, 4, 5, 6, 7) in the upper part of the track bed can be respectively formed by the multi-segment members through reserved holes, plug-ins, and inserts. It is formed by splicing and connecting, arranged along the inner arc surface of the shield tunnel segment, and can be connected and closed in the ring direction to form a whole ring structure; the circular arc-shaped member fits the shape of the standard subway tunnel shield segment segment and is close to the shield tunnel. The inner surface of the segment; the adjacent circular arc-shaped members in the circumferential direction can be reinforced with slats or bolts, so it is necessary to reserve holes on the circular-arc-shaped members at the corresponding anchoring positions; under the ballast bed The width of the pre-embedded arc-shaped member (2) is the same as the width of the shield segment, and the width of the removable arc-shaped member (3, 4, 5, 6, 7) at the top of the track bed is smaller than the width of the shield segment, which is the pre-embedded segment. The channel leaves room for operation; the circular arc-shaped members (3, 4, 5, 6, 7) on the upper part of the track bed are detachable, movable and reusable;

2) During the tunnel construction in the subway section, the arc-shaped member (2) is pre-buried in the lower part of the ballast bed between the shield segment and the design position of the concrete ballast bed in advance, and is poured integrally with the concrete ballast bed; the lower part of the ballast bed is pre-buried; The submerged arc-shaped members (2) are continuously arranged longitudinally in multiple segments within the shield tunneling interval;

3) Install the detachable circular arc-shaped members (3, 4, 5, 6, 7) on the upper part of the ballast bed on the inner wall of the shield segment above the ballast bed in the section affected by external interference, and pre-assembled with the lower part of the ballast bed in this section. The buried circular arc-shaped member (2) is connected and closed to form a whole ring structure, which plays a reinforcing role;

When the upper part of the ballast bed is closed into a ring for reinforcement, the installation sequence of the detachable arc-shaped members (3, 4, 5, 6, 7) on the upper part of the ballast bed is counterclockwise. Pre-fix the anchor bolts on the shield segment, use simple equipment to transport the adjoining building block (3) on the right side of the bottom into place, protect and fine-tune by the hanging hoist, and then pass the anchor bolts through the adjoining building block (3) on the right side of the bottom. The oblong hole-shaped bolts have reserved holes, and use nuts to adjust and temporarily fix the bottom right adjoining member block (3) on the shield segment; (5) The arc-shaped member (6) adjacent to the left side of the top is installed to a predetermined position, and the adjacent arc-shaped members are preliminarily connected with bolts or trim plates; the arc-shaped member (6) is adjacent to the left side of the top . A mechanical jack is used to apply axial stress between the pre-buried arc-shaped members (2) at the bottom of the track bed, so that the annular reinforcement structure device is tensioned, and the inner side of the concrete segment is as close as possible. The arc-shaped member (7) adjacent to the left side of the bottom should be set out according to the actual distance after the axial stress is applied by the jack; after all the arc-shaped members have been installed, tighten the bolts or slats to strengthen the annular connection and fix it. The anchor bolts ensure the connection between the arc-shaped member and the shield segment, so as to form a good annular force-bearing whole inside the tunnel shield section, which plays the role of reinforcement and support for the tunnel;

4) After the external interference factors are eliminated, remove the detachable arc-shaped members (3, 4, 5, 6, 7) on the upper part of the track bed in this section, and move to the next required section, repeat the above steps, and continue Implement reinforcement.

The detachable arc-shaped members (3, 4, 5, 6, 7) on the upper part of the ballast bed are connected with the lining segment by anchor bolts, and the gap between the arc-shaped member and the inner arc surface of the shield segment is made of epoxy resin. Resin and other materials are densely filled.

The position of the anchor bolt should avoid hand holes, segment steel bars, etc., and make appropriate adjustments when encountered, but the distance from the edge should be greater than 100mm.

Arc-shaped components can be coated with anti-corrosion treatment.

The epoxy bituminous coating used in the anti-corrosion process of the components should meet the national standards, and the color of the concrete segment should be as similar as possible after mixing with the pigment, and the coating should be carried out by means of multi-layer painting. It is required that the coating thickness is uniform, the bonding is firm and tight, and there are no defects such as falling off, cracking, holes, and poor brushing and crimping.

The thickness of the arc-shaped member is 30mm, the width of the pre-embedded arc-shaped member 2 at the lower part of the track bed is 1.2m (same as the width of the shield segment), and the width of the detachable arc-shaped member on the upper part of the track bed is less than 1.0m (less than 1.0m). The width of the shield segment, leaving the operating space for the embedded channel).

The detachable arc-shaped members (3, 4, 5, 6, 7) on the upper part of the ballast bed are intermittently arranged in multiple segments along the longitudinal direction of the shield tunnel segment in the section affected by external interference, and a certain space is reserved to avoid the shield tunnel. Equipment, pipeline supports, etc. installed on the pre-embedded grooves of the segment and the channel; where there is no equipment or pipeline arrangement, the upper part of the longitudinally adjacent track bed can be removed from the arc-shaped member (3, 4, 5, 6, 7) Steel plates, etc. can be used for connection between them to strengthen the connection and integrity between the members of each ring.

The pre-embedded arc-shaped members at the lower part of the ballast bed and the detachable arc-shaped members at the upper part of the ballast bed are arranged with staggered joints longitudinally relative to the shield segment, that is, each segment of the arc-shaped member covers the shield segment ring. The seam between the longitudinal arc-shaped components is in the middle of the segment, which can strengthen the longitudinal rigidity of the shield segment.

Compared with the traditional existing shield reinforcement technology, the beneficial effects of the present invention are:

1. Due to the uncertainty of external interference factors, in the present invention, the pre-embedded circular arc-shaped member at the bottom of the track bed and the removable circular-arc-shaped member at the top of the track bed are used for reinforcement in stages. Therefore, the corresponding position can be selected according to the actual external interference. Reinforcing the segment, shortening the reinforcement construction period, and greatly reducing the project cost.

2. In the present invention, the pre-buried arc-shaped components are used in the lower part of the track bed and are cast integrally with the track bed. Therefore, if the shield needs to be reinforced after the actual operation of the subway, the circular arc-shaped components on the upper part of the track bed are used to directly connect with the lower part of the track bed. The submerged arc-shaped components are spliced and closed into a ring, which can avoid the processing of cutting, drilling, and chiseling of the track bed, reduce tunnel diseases in the later stage, and improve the reliability and safety of subway operations.

3. Because the movable subway tunnel reinforcement method is adopted in the present invention, that is, a detachable arc-shaped member is used on the upper part of the track bed to reinforce the shield. Therefore, after the external interference factors are eliminated, part of the arc-shaped components above the ballast bed can be removed and moved to the next section to continue reinforcement. Only the detachable arc-shaped components can be operated. The construction is fast and the existing shield tunnel The damage to the track bed structure is small, the stability of the tunnel and the safety of the normal operation of the train are not affected, and the materials are reused, which saves the engineering cost.

4. The detachable circular arc-shaped members on the upper part of the middle track bed of the present invention are intermittently arranged in longitudinal multi-section along the shield segment, and a certain space is reserved to avoid the embedded grooves of the shield segment and the equipment and pipelines installed on the channel. Brackets, etc., do not affect the layout of auxiliary equipment in subway tunnels, and have obvious advantages in shield reinforcement in subway tunnels.

5. The arc-shaped reinforcing member in the present invention adopts staggered arrangement longitudinally relative to the shield tunnel segment, which can play a role of strengthening the longitudinal connection rigidity of the shield tunnel segment.

Description of drawings

Fig. 1 is the schematic diagram of the arc-shaped member of the present invention;

Fig. 2 is a schematic diagram of the assembly of a single-ring segment multi-segment arc-shaped member of a shield machine according to the present invention;

3 is a schematic diagram of the space structure of the shield segment lining reinforcement of the present invention;

4 is a schematic cross-sectional view of the shield segment lining reinforcement of the present invention;

Fig. 5 is a schematic diagram of the assembly process of the movable reinforcement of the shield segment of the present invention;

Among them, Figure a: Schematic diagram of the pre-buried arc-shaped components at the bottom of the track bed

Figure b: Schematic diagram of the whole ring structure formed by connecting and closing the upper circular arc-shaped member and the lower embedded member of the track bed

Figure c: Longitudinal multi-segment continuous arrangement of lower embedded components and longitudinal discontinuous arrangement of upper detachable components

In the figure: 1- reserved bolt holes at both ends of the arc-shaped member, 2- pre-embedded arc-shaped member D in the lower part of the track bed, 3- the right side of the bottom is adjacent to the arc-shaped member B ₂ , 4- the right side of the top is adjacent to the arc-shaped member Shaped member B ₁ , 5-capped arc-shaped member F, 6-top left side adjoining arc-shaped member A ₁ , 7-bottom left side adjoining arc-shaped member A ₂ , 8-shield segment, 9-track bed , 10- reserved space for embedded channels, 11- detachable arc-shaped members intermittently arranged at the upper part of the track bed, 12- embedded arc-shaped members continuously arranged at the lower part of the track bed, 13- anchor bolts, 14- jack application The position of the force, where A ₁ , A ₂ , B ₁ , B ₂ , F are collectively referred to as the removable circular arc-shaped member on the upper part of the track bed.

Detailed ways

Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail:

As shown in Figure 1, it is an arc-shaped member. The arc-shaped member can be made of composite materials such as Q235B and high-strength fiber, which are closely lined with shield segments. According to the reinforcement implementation steps, it can be divided into the lower part of the ballast bed. The pre-embedded arc-shaped member 2 and the removable arc-shaped members 3, 4, 5, 6, and 7 at the upper part of the track bed; The width of the detachable arc-shaped member 3-7 on the upper part of the track bed is 1.0m (to leave operating space for the embedded channel); bolt holes are reserved at both ends of the member so that the arc-shaped member can be The components are connected and closed to form an integral ring structure;

As shown in Figure 2, the reinforced arc-shaped members used in each ring are composed of 6 segments: 2- the lower part of the track bed is embedded with the arc-shaped member D, 3- the right side of the bottom is adjacent to the arc-shaped member B ₂ , 4- The top right side adjoins the arc-shaped member B ₁ , 5-capped arc-shaped member F, 6-top left side adjoins the arc-shaped member A ₁ , 7-bottom left side adjoins the arc-shaped member A ₂ . Among them, the capping circular arc member (F) is at an angle of 40° relative to the center of the tunnel, and the adjacent members (A ₁ , B ₁ , A ₂ , B ₂ ) are at an angle of 60° relative to the center of the tunnel and the embedded member (D) at the lower part of the track bed. It is 80° relative to the center of the tunnel, which is just closed to form a whole ring structure;

As shown in Figure 3, the pre-embedded arc-shaped members at the lower part of the track bed are continuously arranged in multiple segments longitudinally within the shield tunneling interval; The segments are arranged intermittently, and a certain space is reserved to avoid the embedded grooves of the shield segments and the equipment and pipeline supports installed on the channels. Among them, where there is no equipment or pipeline arrangement, steel plates or composite materials can be used to connect longitudinally adjacent components to strengthen the connection and integrity of each ring component: after the external interference factors are eliminated, the parts above the track bed can be connected. The arc-shaped member is removed and moved to the next section to continue the reinforcement:

As shown in Figure 4, the assembly sequence of the reinforced arc-shaped member with the inner lining of the shield segment is as follows: firstly, the arc-shaped member (D) is pre-buried in the lower part of the ballast bed, and it is poured integrally with the ballast bed; , The installation sequence of the building block is counterclockwise, first install the adjacent building block (B ₂ ) on the right side of the bottom, fix the anchor bolt on the segment first, use a simple manipulator to transport the arc-shaped component in place, and use the hanging hoist for protection and fine-tuning. , and then make the anchor bolts 13 pass through the holes reserved for the oblong hole-shaped bolts on the arc-shaped member, and finally use the nut to pre-adjustably fix the arc-shaped member on the shield segment; It is also installed to the predetermined position with simple equipment, and the adjacent arc-shaped components are connected with bolts, and the installation of the steel blocks is completed in a counterclockwise direction; mechanical jacks are used between A ₁ and D to apply axial stress to make the circle The arc-shaped members are tensioned, and try to be as close as possible to the inner side of the shield segment. Strictly ensure that the inner limit of the lining is _5800mm through measurement. Finally, the B1 steel plate should be set out according to the actual distance after the axial stress is applied by the jack. After all the arc-shaped components are installed, the bolts are anchored or the slats are used to strengthen the circumferential connection to ensure that a good force-bearing whole is formed inside, which plays a role in strengthening and supporting the tunnel;

Figure 5 shows a schematic diagram of the assembly process of the movable reinforcement of the shield segment.

Figure (a): The arc-shaped member 2 is embedded in the lower part of the pre-embedded ballast bed, which is poured integrally with the concrete ballast bed, and enough space is reserved at both ends of the member for anchoring connection with the reinforcing member on the top of the ballast bed, so as to avoid the overall impact of the ballast bed. sexually destructive;

Figure (b): The detachable arc-shaped member on the upper part of the ballast bed and the lower embedded member are connected and closed to form a whole ring structure. The adjacent members in the ring are connected by plate anchor bolts or bolts to strengthen the connection. The arc-shaped member is as close as possible to the pipe The inner arc surface of the sheet is close to each other, and the member and the lining segment are connected by anchor bolts;

Figure (c): The pre-buried arc-shaped members 2 at the lower part of the track bed are arranged continuously in multiple segments in the longitudinal direction, and the width of each segment is 1.2m, which is the same width as the shield segment; , 5, 6, 7 are arranged intermittently in the longitudinal direction, the width of each segment is less than 1.0m, and a certain space (greater than 0.2m wide) is reserved to avoid the embedded groove of the shield segment and the equipment and pipeline supports installed on the channel. . Among them, where there is no equipment or pipeline arrangement, the longitudinal adjacent members can be connected by steel plates or composite materials, so as to strengthen the connection and integrity between the members of each ring. Among them, the pre-embedded arc-shaped members in the lower part of the track bed and the detachable arc-shaped members in the upper part are arranged with staggered joints longitudinally relative to the shield segment, that is, each segment of the arc-shaped member covers the annular seam of the shield segment, and the longitudinal arc-shaped The seam between the components is in the middle of the segment, which can strengthen the longitudinal connection rigidity of the shield segment. The gap between the arc-shaped component and the shield segment is filled with epoxy resin and other materials to be dense, and the arc-shaped component can be treated with anti-corrosion coating.

In this embodiment, the connection between all arc-shaped members is not in the form of welding, and the reserved holes are used for anchoring through plug-ins and anchor bolts, so that after the external interference factors are eliminated, the arc-shaped members above the track bed can be connected. Remove and move to the next section to continue reinforcement.

In this embodiment, the detachable circular arc-shaped members 3, 4, 5, 6, and 7 on the upper part of the track bed are connected with the segment by anchor bolts, the longitudinal spacing of the anchor bolts is 50mm, the circumferential spacing is 60mm, and each ring is provided with 2 rows; The arc-shaped members are connected by slats or bolts in the circumferential direction, and the slats can be made of 200mm×300mm×30mm steel plates or composite materials.

In this embodiment, the paint used in the anti-corrosion process must meet the national standard, and the color of the concrete segment should be as similar as possible after mixing with the paint, and the paint should be applied by means of multi-layer painting. It is required that the coating thickness is uniform, the bonding is firm and tight, and there are no defects such as falling off, cracking, holes, and poor brushing and crimping.

The present invention has the following advantages: in the present invention, the pre-embedded circular arc-shaped member at the bottom of the ballast bed and the detachable circular-arc-shaped member at the top of the ballast bed are used for reinforcement in stages. The reinforcement construction period also greatly reduces the engineering cost; because the pre-embedded arc-shaped member is used in the lower part of the track bed in the present invention, and it is integrally poured with the track bed, so if the shield needs to be reinforced after the actual operation of the subway, the upper part of the track bed is used. The arc-shaped member is directly spliced with the lower pre-buried arc-shaped member to form a ring, which can avoid cutting, drilling, and chiseling of the track bed in the later reinforcement process of the whole ring, reducing the later tunnel diseases and improving the reliability of subway operation. and safety; the circular arc-shaped member on the upper part of the middle track bed of the present invention is detachable, and can be moved according to adjacent construction changes for reinforcement, the construction is fast, and the material is reused; The segments are arranged intermittently in longitudinal multi-segment, which does not affect the layout of the auxiliary equipment of the tunnel in the subway section.

The above description of the embodiments is for the convenience of those of ordinary skill in the art to understand and apply the present invention. Therefore, the present invention is not limited to the embodiments herein, and improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should all fall within the scope of the technical aspects claimed in the present invention.

Claims (7)

1. A stage-by-stage movable subway interval tunnel shield segment reinforcing method is characterized by comprising the following steps:

1) prefabricating arc-shaped components in a factory, wherein the arc-shaped components can be formed by compounding metal, high-strength fiber materials and the like, the arc shapes of the arc-shaped components are matched with the arc of a shield, plug-in holes are reserved on each longitudinal end face, and the arc-shaped components are divided into pre-buried arc-shaped components (2) at the lower part of a track bed and detachable arc-shaped components (3, 4, 5, 6, 7) at the upper part of the track bed; the embedded arc-shaped component (2) at the lower part of the track bed and the detachable arc-shaped components (3, 4, 5, 6, 7) at the upper part of the track bed can be respectively formed by splicing and connecting multi-section components through preformed holes and inserts, are arranged along the inner arc surface of the shield segment, and can be connected and sealed in the annular direction to form a whole ring structure; the arc-shaped component is fitted with the shape of a standard subway tunnel shield segment and is tightly attached to the inner surface of the shield segment; circumferentially adjacent circular arc-shaped members can be reinforced and connected by adopting gusset plates or bolts, so hole sites need to be reserved on the circular arc-shaped members at corresponding anchoring positions; the width of the embedded arc-shaped component (2) at the lower part of the ballast bed is the same as that of the shield segment, and the width of the detachable arc-shaped component (3, 4, 5, 6, 7) at the upper part of the ballast bed is smaller than that of the shield segment, so that an operation space is reserved for an embedded channel; the circular arc-shaped components (3, 4, 5, 6, 7) on the upper part of the track bed are detachable, movable and reusable;

2) when a subway interval tunnel is constructed, pre-embedding an arc-shaped member (2) at the lower part of a track bed between a shield segment and a concrete track bed design position in advance, and integrally pouring the arc-shaped member and the concrete track bed; the arc-shaped members (2) embedded at the lower part of the ballast bed are continuously arranged in multiple sections in the longitudinal direction in the range of the shield interval;

3) the inner wall of the shield segment above the ballast bed of the section subjected to external interference is provided with detachable arc-shaped members (3, 4, 5, 6 and 7) at the upper part of the ballast bed, and the detachable arc-shaped members are connected and sealed with the embedded arc-shaped members (2) at the lower part of the ballast bed in the section to form an integral ring structure, so that the reinforcing effect is achieved;

when the upper part of the track bed is sealed and reinforced in a ring mode, the mounting sequence of detachable circular arc-shaped components (3, 4, 5, 6 and 7) on the upper part of the track bed is anticlockwise, firstly, a bottom right side adjacent component block (3) is mounted and can be fixed on a shield pipe sheet by using an anchor bolt, the bottom right side adjacent component block (3) is conveyed to a position by adopting simple equipment, protection and fine adjustment are carried out by a hanging gourd, then the anchor bolt penetrates through a long circular hole-shaped bolt preformed hole of the bottom right side adjacent component block (3), and the bottom right side adjacent component block (3) is adjustably and temporarily fixed on the shield pipe sheet by adopting a nut; installing top right side adjacent circular arc-shaped components (4), capping circular arc-shaped components (5) and top left side adjacent circular arc-shaped components (6) at preset positions by simple equipment, and simultaneously performing primary connection between the adjacent circular arc-shaped components by using bolts or batten plates; applying axial stress between the top left side adjacent arc-shaped member (6) and the track bed lower embedded arc-shaped member (2) by adopting a mechanical jack, tensioning the annular reinforcing structure device, tightly attaching the annular reinforcing structure device to the inner side of the concrete segment as much as possible, strictly ensuring that the inner limit of the lining is 5800mm through measurement, and finally performing lofting installation on the bottom left side adjacent arc-shaped member (7) according to the actual distance after the axial stress is applied by the jack; after all the arc-shaped members are completely installed, the bolts or the batten plates are screwed tightly to strengthen the circumferential connection, and the anchor bolts are fixed to ensure the connection of the arc-shaped members and the shield segments, so that a good annular stress whole is formed inside a tunnel shield interval to play a role in reinforcing and supporting the tunnel;

4) after the external interference factors are eliminated, the upper detachable circular arc-shaped members (3, 4, 5, 6, 7) of the track bed in the section are detached and moved to the next required section, and the steps are repeated to continue to carry out reinforcement.

2. The stage-by-stage movable subway section tunnel shield segment reinforcing method according to claim 1, wherein said detachable circular arc members (3, 4, 5, 6, 7) on the upper portion of the ballast bed are connected with the lining segment by anchor bolts, and the gap between the circular arc member and the inner arc surface of the shield segment is tightly filled with epoxy resin and other materials.

3. The stage-by-stage movable subway section tunnel shield segment reinforcing method according to claim 2, wherein said anchor bolt position needs to avoid hand holes, segment reinforcements and the like, and is properly adjusted when meeting, but the distance of avoiding the edge needs to be more than 100 mm.

4. The staged movable subway section tunnel shield segment reinforcing method as claimed in claim 1, further comprising: the arc-shaped member is subjected to coating anticorrosion treatment, the coating adopted by the member anticorrosion process is in accordance with the national standard, the color of the coating is similar to that of the concrete pipe piece as much as possible after the coating is doped with pigment, and the coating is carried out by adopting a multi-layer coating mode.

5. The stage-by-stage movable subway section tunnel shield segment reinforcing method according to claim 1, wherein the thickness of the arc-shaped member is 30mm, the width of the pre-buried arc-shaped member 2 at the lower part of the track bed is 1.2m (same as the width of the shield segment), and the width of the detachable arc-shaped member at the upper part of the track bed is within 1.0m (smaller than the width of the shield segment, leaving an operation space for the pre-buried channel).

6. The stage-by-stage movable subway section tunnel shield segment reinforcing method according to claim 1, wherein the detachable circular arc members (3, 4, 5, 6, 7) on the upper portion of the ballast bed are discontinuously arranged along multiple longitudinal segments of the shield segment in the section where the external interference is received, and a certain space is reserved to avoid the shield segment pre-buried groove and equipment, pipeline supports and the like installed on the channel; at the position without equipment and pipeline arrangement, the upper detachable circular arc-shaped members (3, 4, 5, 6, 7) of the longitudinally adjacent track beds can be connected by steel plates and the like.

7. The stage-by-stage movable subway section tunnel shield segment reinforcing method according to claim 1, wherein said arc-shaped members pre-embedded at the lower portion of the track bed and said arc-shaped members detachable at the upper portion of the track bed are arranged in staggered manner longitudinally relative to the shield segment, that is, each arc-shaped member covers the circumferential joint of the shield segment, and the joint between the longitudinal arc-shaped members is in the middle of the segment.

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