CN112065457A - Stage-by-stage movable subway interval tunnel shield segment reinforcing method - Google Patents
Stage-by-stage movable subway interval tunnel shield segment reinforcing method Download PDFInfo
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- CN112065457A CN112065457A CN202011081436.XA CN202011081436A CN112065457A CN 112065457 A CN112065457 A CN 112065457A CN 202011081436 A CN202011081436 A CN 202011081436A CN 112065457 A CN112065457 A CN 112065457A
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- 241000219122 Cucurbita Species 0.000 claims description 3
- 235000009852 Cucurbita pepo Nutrition 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 239000000049 pigment Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/12—Temporary supports for use during building; Accessories
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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Abstract
The invention relates to a stage-by-stage movable subway interval tunnel shield segment reinforcing method. When a subway interval tunnel is constructed, pre-embedding an arc-shaped component between a shield segment and a track bed, and integrally pouring the arc-shaped component and the track bed; the shield segments above the ballast bed of the section subjected to external interference are also arc-shaped members, and are connected and sealed with the pre-embedded arc-shaped members to form a whole ring structure so as to play a reinforcing role; after the external interference factors are eliminated, the part of the circular arc-shaped member above the track bed can be removed, and the part of the circular arc-shaped member is moved to the next section for continuous reinforcement. Because the external interference factors are uncertain, the 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 adopted to carry out reinforcement by stages, so that the corresponding positions can be selected according to the actual external interference to carry out reinforcement on the duct pieces, the reinforcement construction period is shortened, and the construction cost is greatly reduced.
Description
Technical Field
The invention relates to the technical field of urban rail transit construction, in particular to a method for reinforcing a tunnel in a subway shield interval.
Background
At present, with the high-speed development and construction of urban rail transit, subway tunnels are inevitably affected by the construction of adjacent buildings. When the construction is carried out at the adjacent position of the subway tunnel, the excavation and bridge pile foundation construction of the existing covering soil have the possibility of influencing the deformation of the subway tunnel, and the problems that the tunnel shield segment joint leaks water, the structure is cracked, the rail surface elevation and the geometric dimension cannot meet the track operation requirement and the like due to overlarge deformation, so that the influence is caused on the normal operation of the subway.
The protection technology for the stability of the existing subway shield tunnel adopted under the condition of adjacent construction in the prior art mainly has two types. One is to take measures in the process of adjacent construction, and measures such as driving protective piles and arranging filling materials are often adopted on a path where the adjacent construction affects the stability of the tunnel. Such measures are often restricted by actual conditions, and the engineering investment and implementation difficulty are high, so that good application effect cannot be achieved. The other method is to take measures for the existing subway tunnel, for example, temporary reinforcement is carried out on the shield segment of the tunnel in the external interference sensitive section, and a semi-ring steel ring is often arranged in the segment for reinforcement. Because the sensitive section of external interference is difficult to pinpoint in the construction, when strengthening the pipe sheet after the tunnel is built, only half ring strengthening can be carried out on the part above the track bed, closed full ring can not be formed, and the strengthening effect is limited.
Disclosure of Invention
The invention aims to provide a movable reinforcing method for the interior of a shield segment, which is simple and convenient to construct, low in construction cost and quick in construction, for the safety protection of a subway shield tunnel, aiming at the defects and shortcomings of the traditional subway tunnel reinforcing technology.
In order to achieve the purpose, the invention provides a stage-by-stage movable subway shield interval tunnel reinforcing method, which is characterized by comprising the following steps of:
1) prefabricating arc-shaped components in a factory, wherein the arc-shaped components can be formed by compounding metal, high-strength fibers and the like, the shapes of the arc-shaped components are matched with the arc of a shield, and the arc-shaped components have the characteristics of high strength, light weight, good corrosion resistance, convenience in installation and disassembly and the like, and 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 and 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 plug-in pieces, are arranged along the inner arc surface of the shield segment, and can be connected and sealed annularly to form an integral 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 annularly reinforced, 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, an anchor bolt can be fixed on a shield pipe sheet in advance, the bottom right side adjacent component block (3) is conveyed to a position by simple equipment, protection and fine adjustment are carried out by a hanging gourd, then the anchor bolt penetrates through a long circular hole 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 a nut; mounting top right-side adjacent circular arc members (4), capping circular arc members (5) and top left-side adjacent circular arc members (6) to preset positions, and simultaneously performing primary connection between the adjacent circular arc members 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.
The arc-shaped components (3, 4, 5, 6, 7) which can be disassembled on the upper part of the ballast bed are connected with the lining segment by adopting anchoring bolts, and the gaps between the arc-shaped components and the inner arc surface of the shield segment are densely filled by adopting materials such as epoxy resin.
The anchor bolt position need avoid hand hole, section of jurisdiction reinforcing bar etc. do suitable adjustment when meetting, but the distance of avoiding the edge needs to be greater than 100 mm.
The arc-shaped member can be subjected to coating anticorrosion treatment.
The epoxy asphalt coating adopted by the component anticorrosion process meets the national standard, is similar to the color of a concrete pipe piece as much as possible after being doped with pigment, and is coated by a multilayer coating mode. The coating thickness is required to be uniform, the bonding is firm and tight, and the defects of falling, cracking, holes, imprecise coating compression joint and the like are not allowed.
The thickness of the arc-shaped component is 30mm, the width of the embedded arc-shaped component 2 at the lower part of the track bed is 1.2m (the width is the same as that of the shield segment), and the width of the detachable arc-shaped component at the upper part of the track bed is less than 1.0m (the width is less than that of the shield segment, and an operation space is reserved for the embedded channel).
The detachable arc-shaped components (3, 4, 5, 6, 7) on the upper part of the ballast bed are discontinuously arranged in the sections subjected to external interference along the longitudinal multi-section of the shield segment, and a certain space is reserved to avoid the shield segment pre-embedded groove and equipment, pipeline supports and the like arranged on the channel; at the position without equipment and pipeline arrangement, the detachable circular arc-shaped members (3, 4, 5, 6, 7) at the upper parts of the longitudinally adjacent track beds can be connected by steel plates and the like, so that the connection and the integrity between each ring of members are enhanced.
The 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 longitudinally arranged in staggered joint mode relative to the shield segment, namely, each section of arc-shaped member covers the circumferential joint of the shield segment, and the joint between the longitudinal arc-shaped members is arranged in the middle of the segment, so that the longitudinal rigidity of the shield segment can be enhanced.
Compared with the traditional shield reinforcing technology, the invention has the beneficial effects that:
1. because the external interference factors are uncertain, the 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 adopted to carry out reinforcement by stages, so that the corresponding positions can be selected according to the actual external interference to carry out reinforcement on the duct pieces, the reinforcement construction period is shortened, and the construction cost is greatly reduced.
2. According to the invention, the embedded arc-shaped component is adopted at the lower part of the track bed and is integrally cast with the track bed, so that if the shield needs to be reinforced after the subway is actually operated, the arc-shaped component at the upper part of the track bed is directly spliced with the embedded arc-shaped component at the lower part of the track bed to form a ring, the track bed can be prevented from being cut, drilled, chiseled and the like, tunnel diseases at the later stage are reduced, and the reliability and the safety of subway operation are improved.
3. The movable subway interval tunnel reinforcing method is adopted in the invention, namely, the shield is reinforced by adopting the detachable arc-shaped component on the upper part of the ballast bed. Therefore, after external interference factors are eliminated, the arc-shaped members above the track bed can be dismantled and moved to the next section for continuous reinforcement, only the detachable arc-shaped members are operated, construction is rapid, damage to the existing shield and track bed structures is small, stability of the tunnel and safety of normal operation of trains are not affected, materials are recycled, and construction cost is saved.
4. According to the invention, the detachable arc-shaped component on the upper part of the ballast bed is discontinuously arranged along the shield segment in multiple longitudinal sections, a certain space is reserved to avoid the shield segment pre-embedded groove, equipment, pipeline supports and the like arranged on the channel, the arrangement of auxiliary equipment of the tunnel in the subway section is not influenced, and the superiority is obvious in the reinforcement of the shield in the subway tunnel section.
5. The arc-shaped reinforcing member is longitudinally arranged in a staggered manner relative to the shield segments, so that the effect of reinforcing the longitudinal connection rigidity of the shield segments can be achieved.
Drawings
FIG. 1 is a schematic view of a circular arc member according to the present invention;
FIG. 2 is an assembly diagram of a multi-segment arc member of a single-ring shield segment according to the present invention;
FIG. 3 is a schematic diagram of a shield segment lining reinforcing space structure according to the present invention;
FIG. 4 is a schematic cross-sectional view of a shield segment lining reinforcement of the present invention;
FIG. 5 is a schematic diagram of a movable reinforcing assembly process of shield segments according to the present invention;
wherein, figure a: schematic diagram of arc-shaped members embedded at lower part of ballast bed
And (b) figure: schematic diagram of forming integral ring structure by connecting and sealing circular arc-shaped component at upper part of ballast bed and embedded component at lower part of ballast bed
And (c) figure: the lower embedded members are longitudinally and continuously arranged in multiple sections, and the upper detachable members are longitudinally and discontinuously arranged
In the figure: 1-bolt holes are reserved at two ends of the arc-shaped component, 2-arc-shaped component D is embedded at the lower part of the track bed, and 3-arc-shaped component B is adjacent to the right side of the bottom24-Top Right Adjacent circular arc Member B15-capping circular arc member F, 6-Top left Adjacent circular arc member A17-bottom left side adjacent to circular arc member A28-shield segment, 9-ballast bed, 10-pre-buried channel reservationSpace, 11-detachable circular arc-shaped members discontinuously arranged at the upper part of the track bed, 12-embedded circular arc-shaped members continuously arranged at the lower part of the track bed, 13-anchoring bolts, 14-positions where the jack applies force, wherein A is1，A2，B1，B2And F is called as a detachable circular arc-shaped component on the upper part of the track bed.
Detailed Description
The invention is described in further detail below with reference to the following figures and examples:
as shown in fig. 1, the arc-shaped member is an arc-shaped member, which can be a member made of composite materials such as Q235B and high-strength fibers and closely attached to the lining of the shield segment, and is divided into an embedded arc-shaped member 2 at the lower part of the track bed and detachable arc- shaped members 3, 4, 5, 6 and 7 at the upper part of the track bed according to the reinforcement implementation step; the thickness of each section of component is 30mm, the width of the embedded arc-shaped component 2 at the lower part of the track bed is 1.2m (the width is the same as that of the shield segment), and the width of the detachable arc-shaped component 3-7 at the upper part of the track bed is 1.0m (an operation space is reserved for an embedded channel); bolt holes are reserved at two ends of the member so that the circular arc-shaped member is connected and sealed to form a whole ring structure;
as shown in fig. 2, the reinforcing circular arc members for each ring are respectively composed of 6 segments: 2-embedding arc-shaped members D at the lower part of the track bed, 3-adjoining arc-shaped members B at the right side of the bottom24-Top Right Adjacent circular arc Member B15-capping circular arc member F, 6-Top left Adjacent circular arc member A17-bottom left side adjacent to circular arc member A2. Wherein the capping circular arc member (F) is at an angle of 40 DEG with respect to the tunnel center, and the adjoining members (A)1，B1，A2，B2) The angle of 60 degrees relative to the center of the tunnel and the angle of 80 degrees relative to the center of the tunnel of the embedded component (D) at the lower part of the ballast bed are just closed to form a whole ring structure;
as shown in fig. 3, the arc-shaped members 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 zone; the circular arc-shaped member can be dismantled on ballast bed upper portion and is being interrupted arranging along the vertical multisection section of shield segment receiving the external disturbance section, reserves certain space in order to avoid shield segment pre-buried recess and equipment, pipeline support etc. of installation on the channel. Wherein, at the position without equipment and pipeline arrangement, the longitudinal adjacent members can be connected by adopting steel plates or composite materials and the like, so as to strengthen the connection and integrity between each ring of members: after the external interference factors are eliminated, the part of the circular arc-shaped member above the track bed can be removed, and the part of the circular arc-shaped member is moved to the next section to be continuously reinforced:
the assembling sequence of the shield segment lining reinforcing circular arc-shaped member shown in fig. 4 is as follows: firstly, embedding an arc-shaped component (D) at the lower part of a track bed, and integrally pouring the arc-shaped component and the track bed; when the upper part of the ballast bed is sealed and looped to be reinforced, the installation sequence of the component blocks is anticlockwise, and the component block adjacent to the right side of the bottom is installed firstly (B)2) Firstly fixing the anchoring bolt on the pipe sheet, conveying the arc-shaped member to the place by adopting a simple manipulator, protecting and finely adjusting by using a hanging gourd, then enabling the anchoring bolt 13 to pass through a long circular hole-shaped bolt preformed hole on the arc-shaped member, and finally, adjustably fixing the arc-shaped member on the shield pipe sheet in advance by adopting a nut; similarly, other circular arc-shaped components are also installed at preset positions by simple equipment, adjacent circular arc-shaped components are connected by bolts, and the installation of the steel plates is completed in sequence in the anticlockwise direction; in A1D, applying axial stress by using a mechanical jack to tension the arc-shaped member to be tightly attached to the inner side of the shield segment as much as possible, strictly ensuring the inner limit of the lining to be 5800mm by measuring, and finally B1And the steel plate is lofted and installed according to the actual distance after the jack applies axial stress. After the arc-shaped components are completely installed, the bolt anchoring or batten plate reinforcing annular connection is carried out so as to ensure that a good stress whole is formed inside and play a role in reinforcing and supporting the tunnel;
fig. 5 is a schematic diagram of a movable reinforcing assembly process of shield segments.
FIG. (a): embedding an arc-shaped member 2 at the lower part of the embedded ballast bed, integrally pouring the arc-shaped member with the concrete ballast bed, and reserving enough space at two ends of the member to perform anchoring connection operation with a reinforcing member at the upper part of the ballast bed so as to avoid damaging the integrity of the ballast bed;
FIG. (b): the detachable arc-shaped component on the upper part of the ballast bed is connected and sealed with the embedded component on the lower part to form an integral ring structure, circumferentially adjacent components are reinforced and connected by batten plate anchor bolts or bolts, the arc-shaped component is tightly attached to the inner arc surface of the segment as much as possible, and the component and the lining segment are connected by the anchoring bolts;
FIG. (c): the embedded arc-shaped members 2 at the lower part of the ballast bed are continuously arranged in multiple longitudinal sections, and the width of each section is 1.2m and is as wide as the shield segment; the detachable circular arc- shaped members 3, 4, 5, 6 and 7 on the upper part of the track bed are arranged longitudinally discontinuously, the width of each section is less than 1.0m, and a certain space (which is more than 0.2m wide) is reserved to avoid the shield segment pre-embedded groove and equipment, pipeline supports and the like installed on the channel. Wherein, at the position without equipment and pipeline arrangement, the longitudinal adjacent members can be connected by steel plates or composite materials, and the like, so that the connection and the integrity between each ring of members are enhanced. The embedded arc-shaped members at the lower part of the ballast bed and the detachable arc-shaped members at the upper part are arranged in staggered joint mode longitudinally relative to the shield segment, namely, each section of arc-shaped member covers the circumferential joint of the shield segment, and the joint between the longitudinal arc-shaped members is arranged in the middle of the segment and can play a role in strengthening the longitudinal connection rigidity of the shield segment. The gap between the arc-shaped component and the shield segment is tightly filled with materials such as epoxy resin, and the arc-shaped component can be subjected to coating anti-corrosion treatment.
In the embodiment, all the circular arc-shaped components are not connected in a welding mode, and the reserved holes are used for being anchored through the inserts and the anchor bolts, so that after external interference factors are eliminated, the partial circular arc-shaped components above the ballast bed can be detached and moved to the next section for continuous reinforcement.
In the embodiment, the detachable circular arc-shaped members 3, 4, 5, 6 and 7 on the upper part of the ballast bed are connected with the duct piece through anchor bolts, the longitudinal distance between the anchor bolts is 50mm, the circumferential distance between the anchor bolts is 60mm, and each ring is provided with 2 rows; the circular arc-shaped members are connected in the circumferential direction by using gusset plates or bolts, and the gusset plates can be made of steel plates or composite materials with the thickness of 200mm multiplied by 300mm multiplied by 30 mm.
In this embodiment, the paint used in the anticorrosion process should meet the national standard, and after the pigment is added, the color of the paint is similar to that of the concrete pipe, and the paint is coated by multilayer coating. The coating thickness is required to be uniform, the bonding is firm and tight, and the defects of falling, cracking, holes, imprecise coating compression joint and the like are not allowed.
The invention has the following advantages: according to the invention, the reinforcing is implemented by stages by adopting the arc-shaped members embedded at the lower part of the ballast bed and the detachable arc-shaped members at the upper part of the ballast bed, so that the corresponding positions can be selected according to the actual external interference to reinforce the duct pieces, the reinforcing construction period is shortened, and the construction cost is greatly reduced; according to the invention, the embedded arc-shaped component is adopted at the lower part of the track bed and integrally poured with the track bed, so that if the shield needs to be reinforced after the subway is actually operated, the arc-shaped component at the upper part of the track bed is directly spliced with the embedded arc-shaped component at the lower part to form a ring, the track bed can be prevented from being cut, drilled, chiseled and the like in the whole ring later stage reinforcing process, the later stage tunnel diseases are reduced, and the reliability and the safety of subway operation are improved; according to the invention, the arc-shaped member on the upper part of the ballast bed can be detached, can move according to the adjacent construction change to implement reinforcement, is quick to construct, and can be repeatedly used; according to the invention, the detachable arc-shaped component on the upper part of the ballast bed is arranged discontinuously in multiple longitudinal sections along the shield segment, so that the arrangement of auxiliary equipment of the tunnel in the subway section is not influenced.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Therefore, the present invention is not limited to the embodiments herein, and those skilled in the art should make improvements and modifications within the technical scope of the present invention as claimed in the present invention based on the disclosure of 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113503172A (en) * | 2021-05-31 | 2021-10-15 | 中铁工程服务有限公司 | Punching method and device for shield subway tunnel segment and storage medium |
| CN114905600A (en) * | 2022-04-29 | 2022-08-16 | 中煤科工集团北京华宇工程有限公司 | Machining method of shield segment test specimen |
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| CN113503172B (en) * | 2021-05-31 | 2023-11-03 | 中铁工程服务有限公司 | Punching method and device for shield subway tunnel segment and storage medium |
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