CN114294010B - Railway tunnel composite assembly type bushing structure and construction method thereof - Google Patents
Railway tunnel composite assembly type bushing structure and construction method thereof Download PDFInfo
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- CN114294010B CN114294010B CN202210067657.4A CN202210067657A CN114294010B CN 114294010 B CN114294010 B CN 114294010B CN 202210067657 A CN202210067657 A CN 202210067657A CN 114294010 B CN114294010 B CN 114294010B
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- 239000010959 steel Substances 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 8
- 230000003014 reinforcing effect Effects 0.000 claims description 7
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- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 8
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- 230000006378 damage Effects 0.000 description 4
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Abstract
The invention discloses a railway tunnel composite assembly type bushing structure and a construction method thereof; comprises an arch tunnel; the assembled bushing comprises an arc-shaped side support lining plate and a vault support lining plate; the number of the side support lining plates is multiple, and the side support lining plates are divided into two groups and are arranged on two sides of the arched tunnel; the number of the arch crown support lining plates is multiple, and the two end heads of each arch crown support lining plate are respectively clamped and fixed in notches formed at the top ends of two adjacent side support lining plates at two sides; the arch crown support lining plates and the two groups of the side support lining plates are spliced in staggered joint to form an arch sleeve lining structure; the bottom reinforcement is arranged at the two ends of the bottom edge of each side supporting lining plate and is used for realizing radial connection between the side supporting lining plates and the original two lining plates of the arched tunnel, annular propping between the side supporting lining plates and the edges of the grooves of the arched tunnel and longitudinal connection between the adjacent side supporting lining plates; the grouting layer fills a gap between the arch bushing structure and the arch tunnel.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a railway tunnel composite assembly type bushing structure and a construction method thereof.
Background
Along with the large-scale construction of the railway tunnel in China, the operation railway tunnel defect gradually steps into a high-rise period. Tunnel lining structure fracture, fall the piece, the net splits, leak water, frost heave etc. disease, sinking, upper drum, ditch external squeezing, the slurry-turning mud-like disease that appears at tunnel bottom all have distributed in the tunnel of northeast, southwest, northwest, southeast etc. areas of china, these diseases have seriously threatened the operation safety of train.
Because the existing line skylight is short in time, limited in tunnel operation space and bad in construction environment, and the construction team is uneven in level, the conventional repairing method and means often cannot achieve the expected effect, so that tunnel diseases are repeatedly generated, the tunnel diseases are difficult to radically cure, a large amount of manpower, material resources and financial resources are consumed, maintenance difficulty and workload are increased, and driving safety and transportation benefits are seriously affected.
In view of this, how to treat all geological conditions and lining damage problems, and propose a convenient and efficient existing line tunnel damage reinforcing technology based on a prefabricated assembly concept, which is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a composite fabricated bushing structure for railway tunnel and a construction method thereof, which aims to solve the above technical problems.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a railway tunnel composite fabricated bushing structure comprising:
an arched tunnel;
a fabricated bushing; the assembled bushing comprises an arc-shaped side support lining plate and a vault support lining plate; the number of the side support lining plates is multiple, the side support lining plates are divided into two groups and are arranged on two sides of the arch tunnel, and the side support lining plates of each group are sequentially attached to each other along the length direction of the arch tunnel; the number of the arch crown support lining plates is multiple, the arch crown support lining plates are sequentially attached to the arch crown of the arch tunnel along the length direction of the arch tunnel, and the two end heads of each arch crown support lining plate are respectively clamped and fixed in notches formed at the top ends of two adjacent side support lining plates on two sides; the arch crown support lining plates and the two groups of side support lining plates are spliced in a staggered joint manner to form an arch sleeve lining structure;
a bottom reinforcement; the bottom reinforcement is arranged at the two ends of the bottom edge of each side supporting lining plate and is used for realizing radial connection between the side supporting lining plates and the original two lining plates of the arched tunnel, annular propping between the side supporting lining plates and the edges of the grooves of the arched tunnel and longitudinal connection between the adjacent side supporting lining plates;
grouting layer; the grouting layer fills a gap between the arch bush structure and the arch tunnel.
Through the technical scheme, the prefabricated lining structure has universality, can solve all geological conditions and lining diseases, has numerous advantages in terms of engineering cost, stress and deformation adaptability, maintainability, environmental affinity, attractive structure and the like compared with the traditional cast-in-situ concrete lining structure, and particularly has more irreplaceable advantages in terms of saving construction period; the structure is mainly characterized by high strength of the assembled bushing structure, strong deformation adaptability and strong structural durability; the construction process is simple, the construction efficiency is high by adopting matched intelligent assembly equipment, and the comprehensive construction cost is low; and the invention does not affect the original structure basically.
Preferably, in the above-mentioned railway tunnel composite assembly type lining structure, the protruding cambered surfaces of the side support lining plate and the vault support lining plate are both formed with corrugated layers, and the crest and trough extension direction of the corrugated layers is the same as the length direction of the side support lining plate and the vault support lining plate. The corrugated layer can provide clearance space and slurry flow channels for the grouting layer, and can improve the structural strength of the side support lining plate and the vault support lining plate; the thickness of the corrugated layer was 2cm and the width was 5cm.
Preferably, in the above-mentioned railway tunnel composite assembly type bushing structure, grouting holes are formed in the side support lining plates and/or the vault support lining plates. The grouting holes can be used as grouting channels after the arch bushing structure is built, and meanwhile, the grouting holes can also be used as supporting holes of the temporary supporting frames and hoisting holes for hoisting.
Preferably, in the above-mentioned railway tunnel composite assembly type bushing structure, the top end face of the side supporting lining board has a first extending plugboard, the two end faces of the dome supporting lining board have a second extending plugboard, and the first plugboard and the second plugboard are isosceles trapezoid boards; an isosceles trapezoid notch with the same shape as the second plugboard is formed between two adjacent first plugboards. The design of the plug board with the isosceles trapezoid structure can enable the ends of two adjacent side support lining boards to be tightly matched with the ends of one vault support lining board.
Preferably, in the above-mentioned railway tunnel composite assembly type bushing structure, a socket hole penetrating through two sides of the waist is formed in the second plugboard, and a socket sleeve is fixedly sleeved in the socket hole; the first plugboard is internally provided with plugholes penetrating through the waists at two sides, the plugholes coaxially correspond to the socket sleeve, and the socket rod is inserted from the plugholes and is fixedly inserted into the socket sleeve. The butt joint of the lining plate ends is connected by adopting a socket structure, so that the connection is simple and convenient, and the structure is stable and reliable.
Preferably, in the above-mentioned railway tunnel composite assembly type sleeve lining structure, the edges of the side support lining plate and the vault support lining plate are embedded with water-swelling water stop tapes. The water-swelling water stop belt can play a role of swelling and blocking during grouting.
Preferably, in the above-mentioned railway tunnel composite assembly type bushing structure, the bottom reinforcement includes a connecting frame, a positioning column, a supporting plate, an adjusting screw and an adjusting nut; the connecting frame comprises a first steel plate, a second steel plate and a third steel plate which are welded and fixed on two adjacent sides; the first steel plate is attached to the inner wall of the arched tunnel and is fixedly connected with the inner wall of the arched tunnel through a fixing bolt, and the second steel plate is attached to the bottom end surface of the side supporting lining plate; the third steel plates are close to the edges of the side support lining plates, and two adjacent corresponding third steel plates of the side support lining plates are fastened and connected through locking bolts; the bottom end of the side support lining plate is provided with a positioning hole which penetrates out of the concave surface of the side support lining plate upwards, and the positioning column is inserted from the top end of the positioning hole, penetrates through the second steel plate and is inserted into a preset hole formed in the edge of the arched tunnel groove; the supporting plate is positioned below the second steel plate and is attached to the edge of the arched tunnel groove; the bottom end of the side support lining plate above the support plate is provided with a threaded mounting hole upwards, a threaded sleeve is fixedly sleeved in the threaded mounting hole, the adjusting screw rod penetrates through the second steel plate, the top end of the adjusting screw rod is in threaded connection with the threaded sleeve, and the bottom end of the adjusting screw rod is tightly propped against the support plate; the adjusting nut is in threaded connection with the adjusting screw, is located below the second steel plate, and is tightly fixed with the bottom surface of the second steel plate in a propping mode. The bottom reinforcement provided by the invention can simultaneously realize radial connection between the side support lining plate and the original two lining plates of the arched tunnel, annular propping between the side support lining plate and the edge of the arched tunnel groove and longitudinal connection between the adjacent side support lining plates, and has the advantages of simple and convenient connection and easy operation and construction.
The invention also provides a construction method of the railway tunnel composite assembly type bushing structure, which comprises the following steps:
s1, symmetrically connecting two side support lining plates on two sides of an arch tunnel through a bottom reinforcement, then realizing radial connection between the bottom reinforcement and the original two lining plates of the arch tunnel, and then connecting one arch support lining plate between the two side support lining plates to realize construction of a ring body structure;
s2, repeating the operation of S1, sequentially constructing the ring structures, longitudinally connecting adjacent bottom reinforcements, circumferentially compacting the side support lining plates and the vault support lining plates while adding one ring structure, and adjusting the bottom reinforcements to tightly support; forming the arch bush structure;
s3, after the arch lining structure is built, grouting and plugging are carried out on the bottom reinforcing member by the support die, and then gaps between the arch lining structure and the arch tunnel are filled to form the grouting layer.
Preferably, in the construction method of the railway tunnel composite assembly type lining structure, in the steps S1 and S2, the vault support lining plates and the side support lining plates on two sides are connected through a socket structure; in the process of building the ring body structure, the side support lining plates and the vault support lining plates are supported through the support frame.
Preferably, in the construction method of the railway tunnel composite fabricated lining structure, in step S2, when the side support lining plate and the dome support lining plate are compressed in the circumferential direction, a jack support is used to adjust between the edge of the arch tunnel groove and the bottom end surface of the side support lining plate.
Compared with the prior art, the invention discloses a construction method of a railway tunnel composite assembly type bushing structure, which has the following beneficial effects:
1. the invention has universality and can solve all geological conditions and lining disease problems.
2. Carrying in real time: once assembled into a ring, the bearing effect can be exerted without maintenance time, thus being beneficial to guaranteeing engineering quality, and the structure has excellent stress performance, high structural strength and strong durability.
3. The progress is quickened: the mechanical degree is high, the assembling speed is high, the operation links are few, the control of the manufacturing cost is facilitated, and the construction period is shortened.
4. Labor is saved: a large number of components can be produced in batch in factories and mechanically assembled in holes, so that labor force is saved.
5. The application is wide: the assembled lining has strong adaptability, can be used in special environments such as high cold and high altitude, has small occupied space and can meet the limit requirements of tunnel structures.
6. Green and environment-friendly: during assembly, a large number of temporary supports such as arches, templates and the like are not needed, so that a large number of supporting materials and labor force are saved, the damage degree to the original structure is reduced to the minimum, and any adverse effect is basically not generated on the original structure.
7. The operation is safe: the complete system for factory production and mechanical assembly is formed, which is beneficial to reducing operation noise and dust and reducing personal injury.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a railway tunnel according to the present invention;
FIG. 2 is a schematic diagram of a railway tunnel according to the present invention with the arch tunnel removed;
FIG. 3 is an enlarged view of portion A of FIG. 2 provided in accordance with the present invention;
FIG. 4 is an enlarged view of portion B of FIG. 2 in accordance with the present invention;
FIG. 5 is a schematic view of a side support liner according to the present invention;
fig. 6 is a schematic structural view of a dome support liner provided by the present invention.
Wherein:
1-an arched tunnel;
2-fitting a bushing;
21-side support liners; 211-a first plugboard; 2111-plug holes; 2112-locating holes; 22-vault support liner; 221-a second plugboard; 2211-socket; 23-grouting holes; 24-socket rod;
25-a water-swellable water stop;
3-a bottom reinforcement;
31-a connecting frame; 311-a first steel plate; 312-a second steel plate; 313-a third steel plate; 32-positioning columns;
33-a support plate; 34-adjusting the screw; 35-adjusting the nut; 36-fixing bolts; 37-locking bolt; 4-grouting layer.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 6, an embodiment of the present invention discloses a railway tunnel composite assembly type bushing structure, which includes:
an arched tunnel 1;
a fitting bushing 2; the assembled bushing 2 comprises an arc-shaped side support lining plate 21 and a vault support lining plate 22; the number of the side support lining plates 21 is multiple, and the side support lining plates are divided into two groups and are arranged on two sides of the arched tunnel 1, and the multiple side support lining plates 21 of each group are sequentially attached to each other along the length direction of the arched tunnel 1; the number of the arch crown support lining plates 22 is multiple, the arch crown support lining plates are sequentially attached to the arch crown of the arch tunnel 1 along the length direction of the arch tunnel 1, and the two end heads of each arch crown support lining plate 22 are respectively clamped and fixed in the notch formed by the top ends of two adjacent side support lining plates 21 on two sides; the plurality of arch crown support lining plates 22 and the two groups of the plurality of side support lining plates 21 are spliced in a staggered manner to form an arch sleeve lining structure;
a bottom reinforcement 3; the bottom reinforcement 3 is arranged at two ends of the bottom edge of each side supporting lining plate 21 and is used for realizing radial connection between the side supporting lining plates 21 and the original two lining plates of the arched tunnel 1, circumferential propping between the side supporting lining plates 21 and the groove edges of the arched tunnel 1 and longitudinal connection between the adjacent side supporting lining plates 21;
grouting layer 4; the grouting layer 4 fills the gap between the arch lining structure and the arch tunnel 1.
In order to further optimize the above technical solution, the protruding cambered surfaces of the side support lining plate 21 and the vault support lining plate 22 are both formed with corrugated layers, and the extending directions of the wave crests and wave troughs of the corrugated layers are the same as the length directions of the side support lining plate 21 and the vault support lining plate 22.
In order to further optimize the technical solution described above, grouting holes 23 are provided in the side support liners 21 and/or in the dome support liners 22.
In order to further optimize the above technical solution, the top end surface of the side support liner 21 has a first extended plugboard 211, and the two end surfaces of the dome support liner 22 have a second extended plugboard 221, and the first plugboard 211 and the second plugboard 221 are isosceles trapezoid boards; an isosceles trapezoid slot having the same shape as the second tab 221 is formed between two adjacent first tabs 211.
In order to further optimize the technical scheme, a socket hole 2211 penetrating through the two sides of the waist is formed in the second plug board 221, and a socket sleeve is fixedly sleeved in the socket hole 2211; the first plug board 211 is internally provided with plug holes 2111 penetrating through the waists of both sides, the plug holes 2111 coaxially correspond to the socket sleeve, and the socket rod 24 is inserted from the plug holes 2111 and is fixedly inserted into the socket sleeve.
In order to further optimize the technical proposal, the edges of the side support lining plates 21 and the vault support lining plates 22 are embedded with water-swelling water stops 25.
In order to further optimize the technical solution described above, the bottom reinforcement 3 comprises a connecting frame 31, a positioning column 32, a support plate 33, an adjusting screw 34 and an adjusting nut 35; the connecting frame 31 comprises a first steel plate 311, a second steel plate 312 and a third steel plate 313 which are welded and fixed on two adjacent sides; the first steel plate 311 is attached to the inner wall of the arched tunnel 1 and is fixedly connected with the inner wall of the arched tunnel 1 through the fixing bolts 36, and the second steel plate 312 is attached to the bottom end surface of the side supporting lining plate 21; the third steel plates 313 are close to the edges of the side support lining plates 21, and two corresponding third steel plates 313 of two adjacent side support lining plates 21 are fastened and connected through locking bolts 37; the bottom end of the side support lining plate 21 is provided with a positioning hole 2112 which penetrates out of the concave surface of the side support lining plate 21 upwards, and a positioning column 32 is inserted from the top end of the positioning hole 2112, penetrates through the second steel plate 312 and is inserted into a preset hole formed at the edge of the groove of the arched tunnel 1; the supporting plate 33 is positioned below the second steel plate 312 and is attached to the edge of the groove of the arched tunnel 1; a threaded mounting hole is formed in the upper side of the supporting plate 33 and upwards in the bottom end of the side supporting lining plate 21, a threaded sleeve is fixedly sleeved in the threaded mounting hole, the adjusting screw 34 penetrates through the second steel plate 312, the top end of the adjusting screw 34 is in threaded connection with the threaded sleeve, and the bottom end of the adjusting screw is tightly propped against the supporting plate 33; the adjusting nut 35 is in threaded connection with the adjusting screw 34, is positioned below the second steel plate 312, and is tightly pressed against the bottom surface of the second steel plate 312.
The construction method of the railway tunnel composite assembly type bushing structure provided by the embodiment comprises the following steps:
s1, two side support lining plates 21 are symmetrically connected to two sides of an arch tunnel 1 through a bottom reinforcement 3, then radial connection between the bottom reinforcement 3 and the original two lining plates of the arch tunnel 1 is achieved, and then a dome support lining plate 22 is connected between the two side support lining plates 21, so that construction of a ring structure is achieved;
s2, repeating the operation of S1, sequentially constructing ring structures, longitudinally connecting adjacent bottom reinforcing members 3, circumferentially compacting the side support lining plates 21 and the vault support lining plates 22 while adding one ring structure, and adjusting the bottom reinforcing members 3 to tightly support; forming an arch bushing structure;
s3, after the arch lining structure is built, grouting and plugging are carried out on the bottom reinforcing member 3 by the support die, and then gaps between the arch lining structure and the arch tunnel 1 are filled to form a grouting layer 4.
In order to further optimize the above technical solution, in steps S1 and S2, the dome support liner 22 and the side support liners 21 on both sides are connected by a socket structure; in the process of building the ring body structure, the side support lining plate 21 and the vault support lining plate 22 are supported by the support frames.
In order to further optimize the solution described above, in step S2, during the circumferential compression of the side support liners 21 and the dome support liners 22, a jack support is used to adjust between the groove edges of the arched tunnel 1 and the bottom end surfaces of the side support liners 21.
The specific construction method of the embodiment may be extended to the following steps:
the preparation stage: and measuring and paying off mileage of the disease treatment section in advance, and arranging preset holes according to the corresponding positions of the assembly structure. Adjusting or removing the cable clamp in the construction section; the fabricated bushing 2 is transported to the work section to be constructed by a erector or a flatbed, and the connection frame 31 with the support plate 33 is partially mounted on the bottom end face of the side support lining plate 21.
Splicing stage-first ring bottom: after the two support plates 33 are installed, the first side support lining plate 21 is assembled through assembling mechanical equipment, temporary support rods are adopted as protection dumping measures before the mechanical equipment is removed, meanwhile, holes are punched in the original two-lining structure through bolt holes formed in advance in the bottom reinforcing member 3, fixing bolts 36 are screwed, and the outer side positioning columns 32 are inserted into the bottom platform. When the bottom reinforcement 3 is joined, the mechanical equipment performs the assembly work of the second side support lining plate 21.
Splicing stage-first ring dome: after the bottom two side support lining plates 21 are assembled, the vault support lining plates 22 are assembled, the structure is assembled in a translation mode along the section of the tunnel, and the vault support lining plates 22 are connected through longitudinal bolts, so that stability of the vault support lining plates 22 is guaranteed, and temporary support is still needed.
Assembling stage-applying circumferential compaction: the above steps are repeated, the side support liners 21 of the second ring are assembled, and the longitudinal connection of the side support liners 21 is performed. After the second ring two side support lining plates 21 are assembled, the structure is subjected to annular compression, and the adjusting screw 34 of the bottom reinforcement 3 is screwed after the compression.
Splicing stage-reciprocating splicing: and repeating the assembling stage to assemble the subsequent lining structure, and adopting a customized grooving prefabricated member at the contact net position when the contact net is not dismantled.
Grouting after wall: after all or part of assembling work of the assembled bushing structure is completed, grouting is carried out after the structure is wall, in order to ensure the connectivity of slurry to the bushing and the original structure, a concrete interface agent can be sprayed before grouting or a hard brush is adopted to carry out roughening-like treatment on the original two bushings in a preparation stage, the two side boundary surfaces of the structure and the bottom reinforcement 3 are plugged before grouting, grouting is carried out through a grouting hole of an arch top, and concrete slurry amount can be calculated according to the corrugated size. After grouting, the grouting holes 23 are plugged.
Facility recovery: and recovering the existing cable, contact net and other facilities.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A railway tunnel composite fabricated bushing structure, comprising:
an arched tunnel (1);
a fitting bushing (2); the assembled bushing (2) comprises an arc-shaped side supporting lining plate (21) and a vault supporting lining plate (22); the number of the side support lining plates (21) is multiple, the side support lining plates are divided into two groups and are arranged on two sides of the arched tunnel (1), and the side support lining plates (21) of each group are sequentially attached to each other along the length direction of the arched tunnel (1); the number of the arch crown support lining plates (22) is multiple, the arch crown support lining plates are sequentially attached to the arch crown of the arch tunnel (1) along the length direction of the arch tunnel (1), and the two end heads of each arch crown support lining plate (22) are respectively clamped and fixed in notches formed at the top ends of two adjacent side support lining plates (21) on two sides; the arch crown support lining plates (22) and the two groups of side support lining plates (21) are spliced in a staggered manner to form an arch sleeve lining structure;
a bottom reinforcement (3); the bottom reinforcement (3) is arranged at the two ends of the bottom edge of each side support lining plate (21) and is used for realizing radial connection between the side support lining plates (21) and the original two lining plates of the arch tunnel (1), circumferential jacking between the side support lining plates (21) and the groove edges of the arch tunnel (1) and longitudinal connection between the adjacent side support lining plates (21);
a grouting layer (4); the grouting layer (4) fills a gap between the arch bush structure and the arch tunnel (1);
the top end face of the side support lining plate (21) is provided with a first extending plugboard (211), the two end faces of the vault support lining plate (22) are provided with a second extending plugboard (221), and the first plugboard (211) and the second plugboard (221) are isosceles trapezoid boards; an isosceles trapezoid notch with the same shape as the second plugboard (221) is formed between two adjacent first plugboards (211);
a socket hole (2211) penetrating through the two side waists is formed in the second plugboard (221), and a socket sleeve is fixedly sleeved in the socket hole (2211); the socket sleeve is characterized in that a plug hole (2111) penetrating through two side waists is formed in the first plug plate (211), the plug hole (2111) coaxially corresponds to the socket sleeve, and a socket rod (24) is inserted from the plug hole (2111) and is fixedly inserted into the socket sleeve.
2. The railway tunnel composite assembly type bushing structure according to claim 1, wherein the protruding cambered surfaces of the side supporting lining plates (21) and the vault supporting lining plates (22) are respectively formed with corrugated layers, and the extending directions of wave crests and wave troughs of the corrugated layers are the same as the length directions of the side supporting lining plates (21) and the vault supporting lining plates (22).
3. A railway tunnel composite fitting type bushing structure according to claim 2, characterized in that grouting holes (23) are provided in the side support lining plates (21) and/or the vault support lining plates (22).
4. A railway tunnel composite fitting type bushing structure according to any one of claims 1-3, characterized in that the edges of the side support liners (21) and the dome support liners (22) are embedded with water-swellable waterstops (25).
5. A railway tunnel composite fabricated bushing structure according to claim 1, characterized in that the bottom reinforcement (3) comprises a connection frame, a positioning column (32), a support plate (33), an adjusting screw (34) and an adjusting nut (35); the connecting frame comprises a first steel plate (311), a second steel plate (312) and a third steel plate (313) which are welded and fixed on two adjacent sides; the first steel plate (311) is attached to the inner wall of the arched tunnel (1) and is fixedly connected with the inner wall of the arched tunnel (1) through a fixing bolt (36), and the second steel plate (312) is attached to the bottom end surface of the side supporting lining plate (21); the third steel plates (313) are close to the edges of the side support lining plates (21), and two adjacent corresponding third steel plates (313) of the side support lining plates (21) are fastened and connected through locking bolts (37); the bottom end of the side support lining plate (21) is provided with a positioning hole (2112) which penetrates out of the concave surface of the side support lining plate (21) upwards, and the positioning column (32) is inserted from the top end of the positioning hole (2112), penetrates through the second steel plate (312) and is inserted into a preset hole formed in the edge of the groove of the arched tunnel (1); the supporting plate (33) is positioned below the second steel plate (312) and is attached to the edge of the groove of the arched tunnel (1); a threaded mounting hole is formed in the bottom end of the side support lining plate (21) above the support plate (33) upwards, a threaded sleeve is fixedly sleeved in the threaded mounting hole, the adjusting screw (34) penetrates through the second steel plate (312), the top end of the adjusting screw (34) is in threaded connection with the threaded sleeve, and the bottom end of the adjusting screw is tightly propped against the support plate (33); the adjusting nut (35) is in threaded connection with the adjusting screw (34), is positioned below the second steel plate (312), and is tightly propped against and fixed with the bottom surface of the second steel plate (312).
6. A method of constructing a composite fabricated bushing structure for a railway tunnel as claimed in any one of claims 1 to 5, comprising the steps of:
s1, two side support lining plates (21) are symmetrically connected to two sides of an arch tunnel (1) through bottom reinforcement members (3), then radial connection between the bottom reinforcement members (3) and original two lining plates of the arch tunnel (1) is achieved, and then one arch support lining plate (22) is connected between the two side support lining plates (21), so that building of a ring body structure is achieved;
s2, repeating the operation of S1, sequentially constructing the ring structures, longitudinally connecting adjacent bottom reinforcements (3), circumferentially compacting the side support lining plates (21) and the vault support lining plates (22) while adding one ring structure, and adjusting the bottom reinforcements (3) to support in a propping manner; forming the arch bush structure;
s3, after the arch sleeve lining structure is built, grouting and plugging are carried out on the bottom reinforcing member (3) by the support die, and then gaps between the arch sleeve lining structure and the arch tunnel (1) are filled to form the grouting layer (4).
7. The construction method of a composite fabricated bushing structure for railway tunnel according to claim 6, wherein in steps S1 and S2, the dome support lining plates (22) and the side support lining plates (21) on both sides are connected by socket structure; in the process of building the ring body structure, the side support lining plates (21) and the vault support lining plates (22) are supported by the support frame.
8. The construction method of a composite fabricated lining structure for a railway tunnel according to claim 6, wherein in step S2, a jack support is used to adjust between the groove edge of the arched tunnel (1) and the bottom end surface of the side support lining plate (21) while performing circumferential compression of the side support lining plate (21) and the dome support lining plate (22).
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