CN114645490A - Construction method of ballastless track of precast slab of urban rail transit underground line - Google Patents
Construction method of ballastless track of precast slab of urban rail transit underground line Download PDFInfo
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- CN114645490A CN114645490A CN202111353514.1A CN202111353514A CN114645490A CN 114645490 A CN114645490 A CN 114645490A CN 202111353514 A CN202111353514 A CN 202111353514A CN 114645490 A CN114645490 A CN 114645490A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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Abstract
The construction method of the ballastless track of the precast slab of the urban rail transit underground line can effectively improve the construction efficiency and operability and can control the quality. The method comprises the following steps: firstly, measuring and setting a base mark; processing the substrate; installing a running rail; binding base steel bars, and installing a limiting groove template and a side mold; pouring base concrete and maintaining; sixthly, laying an isolation layer and a rubber buffer pad; seventhly, paving an adjusting layer mesh sheet; eighthly, laying a prefabricated track plate and finely adjusting; ninthly, installing a pressing device and a peripheral edge sealing template; injecting a regulating layer (12) at the red (R) for self-compacting concrete and curing; mounting a steel rail component; adopting a single well forward laying method, wherein the progress index is 40 m/d; or a double-well forward-laying method is adopted, and the progress index is 50 m/d.
Description
Technical Field
The invention relates to rail transit, in particular to a construction method of an underground line precast slab ballastless track of urban rail transit.
Background
The track pillow type ballastless track inherits and develops a mature track skeleton concept of the ballast track, and different sleeper embedded structures are formed according to different sleeper design structures such as supporting block type and double block type. However, the existing ballastless track with sleepers has many defects, which are mainly reflected in that: the construction progress is slow, and the track bed needs to be subjected to steel bar binding, concrete pouring and concrete curing construction; the amount of concrete poured is large, the dust is serious, the welding fume of steel bar welding is large, and the working environment is poor; the process is complex, the site comprises 10 processes, the space of the working surface is limited, all the processes can be performed in sequence, and the upper structure is difficult to realize mechanical pollution of the construction; the steel rails and fasteners are polluted due to manual pouring and construction period; the concrete mixing plant is generally far away from urban areas, so that the problem of long transportation distance exists, and meanwhile, a transport vehicle can only pass at night in the urban areas, so that the transportation efficiency is low, and the traffic order is influenced; the phenomena of cracking, block falling and the like of the whole ballast bed often occur in the operation process, the durability of a track structure is influenced, when a ballast bed plate is replaced, complicated process flows such as cutting of the damaged ballast bed, arrangement of reinforcing steel bars and the like are needed, the construction of the front and rear ballast bed plates is greatly interfered, and the maintainability is poor.
Aiming at various problems of the cast-in-place integral ballast bed, the structure of the prefabricated slab ballastless track can be effectively solved. The prefabricated slab ballastless track is a track form which is formed by paving a prefabricated track slab on a reinforced concrete base which is cast in situ and provided with a limiting groove through a self-compacting concrete adjusting layer below the slab.
At present, the speed of the subway under construction design in China reaches 160km, higher requirements are provided for the technology of a subway precast slab track bed, higher requirements are provided for the construction process in the face of different urban environments and different construction working conditions, a set of construction method with strong applicability, strong operability and high cost performance is particularly key, and important reference is provided for later construction of urban rail transit underground line precast slab ballastless tracks.
Disclosure of Invention
The invention aims to solve the technical problem of providing a construction method of an urban rail transit underground line precast slab ballastless track, so as to effectively improve the construction efficiency and operability and realize controllable quality.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention discloses a construction method of an urban rail transit underground line precast slab ballastless track, which comprises the following steps:
firstly, measuring and setting a base mark; processing the substrate; installing running rails; binding base steel bars, and installing a limiting groove template and a side mold; pouring base concrete and maintaining; sixthly, laying an isolation layer and a rubber buffer pad; seventhly, paving an adjusting layer mesh sheet; eighthly, laying a prefabricated track plate and finely adjusting; ninthly, installing a pressing device and a peripheral edge sealing template; injecting a regulating layer (12) at the red (R) for self-compacting concrete and curing; mounting a steel rail component;
adopting a single-well forward laying method, namely taking one interval of two stations as a track laying unit, taking a track laying base as a starting point, and carrying out forward base construction by utilizing track materials such as base track panel wells or shield underground reinforcing steel bars, templates and the like; after the strength of the base reaches 75% of the design strength, the base track panel well or the shield underground track plate, the steel rail and other track materials are utilized to lay the forward track plate and pour self-compacting concrete, the self-compacting concrete can bear the load after the strength reaches 100%, and the progress index is 40 m/d;
or a double-well forward laying method is adopted, namely, two well mouths at two ends of the interval are respectively used as feed openings to be constructed in parallel, the preposed well mouth is used for base pouring operation by using a tire type distributing machine, the postposed well mouth is used for all construction except the base by using a track laying machine set, and the progress index is 50 m/d.
The invention has the advantages of high construction efficiency, controllable quality, low cost and strong operability, and can be widely popularized and applied.
Drawings
The specification includes the following three drawings:
FIG. 1 is a schematic cross-sectional view of a precast slab ballastless track structure;
FIG. 2 is a schematic view of an embodiment 1 of the construction method of the ballastless track of the precast slab of the underground line of the urban rail transit according to the invention;
fig. 3 is a schematic view of a ballastless track construction method of an underground line precast slab of urban rail transit according to embodiment 2 of the invention.
The figures show the components and corresponding references: the track comprises a base 10, a prefabricated track plate 11, an adjusting layer 12, an isolating layer 13, an expansion anchor bolt 14 and a traveling track 15.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
Referring to fig. 1, the structure of the prefabricated slab ballastless track is that a base 10, an isolation layer 13, an adjustment layer 12 and a prefabricated track slab 11 are sequentially arranged on a substrate from bottom to top. The foundation 10 is a reinforced concrete structure cast in situ and is fixedly connected with the substrate through anchor expansion bolts 14 arranged at intervals in the longitudinal direction and the transverse direction. A limiting groove is formed in the middle of the base 10, and the isolation layer 13 covers the bottom surface and the side wall of the limiting groove and covers the top surface of the base 10. And pouring and filling self-compacting concrete between the bottom surface of the prefabricated track slab 11 and the top surface of the base 10 and in the limiting groove to form an adjusting layer 12.
Referring to fig. 1, the method for constructing the ballastless track of the precast slab of the urban rail transit underground line comprises the following steps:
firstly, measuring and setting a base mark; processing the substrate; mounting a traveling rail 15; binding the steel bars of the base 10, and installing a limiting groove template and a side mold; fifthly, pouring concrete on the base 10 and maintaining; sixthly, laying an isolation layer 13 and a rubber buffer pad; seventhly, paving a mesh sheet of the adjusting layer 12; eighthly, laying a prefabricated track slab 11 and finely adjusting; ninthly, installing a compression device and a peripheral edge sealing template; injecting the adjusting layer 12 at the front part of the roof for self-compacting concrete and curing; a rail member is installed.
Referring to fig. 2, a single-well forward laying method can be adopted, and the method is suitable for the existing line construction or the track laying base which cannot provide a key equipment room for the wellhead. The method comprises the following steps of (1) taking an interval between two stations and one station as a track laying unit, taking a track laying base as a starting point, and carrying out forward foundation construction by utilizing track materials such as base track panel wells or shield underground steel bars, templates and the like; after the base strength reaches 75% of the design strength, the base track panel well or the shield underground track plate, the steel rail and other track materials are utilized to lay the track plate and fill the self-compacting concrete, the self-compacting concrete can bear the load after the strength reaches 100%, and the progress index is 40 m/d.
Referring to fig. 3, or a double-well forward laying method is adopted, namely two well mouths (shield wells or track panel wells) at two ends of a section are respectively used as feed openings to be constructed in parallel, a tire type distributing machine is used for base pouring operation at a front well mouth, a track laying machine set is used for all construction except for a base at a rear well mouth, and the progress index is 50 m/d.
The method comprises the following steps that firstly, the center of a line is taken as a reference, a measuring base mark is positioned on the left side and the right side of a substrate at an offset distance of 1100mm in a direction vertical to the line, a 9.6m substrate plate is positioned along the line direction, and the measuring base mark is a steel bar with the diameter of 12mm and the length of 400 mm.
Chiseling a tunnel foundation by using an air compressor and an air pick, chiseling after removing a loose and weak layer of the foundation and cleaning cement mortar and laitance, wherein the chiseling depth of the foundation is 5-10 mm, the longitudinal and transverse distances are less than or equal to 150mm, the new surface of the foundation in the treatment range is not less than 75%, and the surface of the cleaned foundation is an obvious concave-convex surface; and 4 groups of expansion anchor bolts (14) are arranged on the substrate, the distance between every two 4 groups of expansion anchor bolts along the line row is 600mm, the implantation foundation depth is 135mm, the exposure height is 110mm, and the bolt tightening torque is not less than 125 N.m.
Step three, paying off the running rail (15) by adopting a method of elastically arranging ink lines, and taking the central line of the rail as a reference, wherein the span of the running rail of the rectangular tunnel is 3.1m, and the span of the running rail of the circular tunnel is 4.6 m; punching a tunnel bottom plate by using an electric hammer, and burying 4 expansion bolts in each steel buttress, wherein the burial depth is 60-70 mm; the steel buttress interval is 1.2 ~ 1.5m, meets rail joint position and adds and establishes the steel buttress.
Fourthly, arranging a section of base (10) on each 2 prefabricated track slabs (11) along the longitudinal direction of the line, wherein the length of each base (10) is 9.6 m; an expansion joint with the width of 30mm is arranged between the adjacent bases (10), and the center of the expansion joint is aligned with the center of the slab joint of the adjacent prefabricated track slab (11);
installing the side forms, marking one side of the steel bar positioning pile by returning 100mm outwards, carrying out elastic line by using a marking position on two sides of a 9.6m base through a long stay wire, installing the side forms of the base, and implanting the side forms into two sides of the template
The reinforced pile is moved to 100mm side, and 2400mm width is guaranteed to one (1.5 m template two) both sides template line of interval 700 mm. And after the template is installed, the template is fixed by adopting an inclined support. One end of the inclined support is fixed on the bottom plate, and the other end supports the upper part of the side template, so that the template linearity can be adjusted by preventing the template from expanding and moving;
mounting a limiting groove template, determining the position of a limiting groove according to the measuring and positioning pile, and taking the inward distances of 0.815m and 3.17m from the two ends of the expansion joint as the central position of the limiting groove; adjusting the position of the limiting groove template, measuring the downward return of the steel bar positioning pile by 100mm, longitudinally tensioning the string, marking the limiting groove, and tensioning the string through the transverse line to obtain the top surface elevation line of the limiting groove template; the template stability was checked.
Fifthly, after the commercial concrete tank car is transported to a track laying base, the tank car is required to rotate at a high speed for 20-30 seconds to unload materials for slump test, the slump test is required to be 180 +/-20 mm, the materials are discharged into a hopper through a discharge port after the slump test is qualified, and the materials are pulled to a construction operation surface by a rail car; when concrete is distributed, the four corners of the limiting groove are poured firstly, so that concrete at the four corners of the limiting groove is prevented from cracking; the concrete is poured for one-time forming, no construction joint is left in the middle, and the periphery of the groove is vibrated compactly; the concrete is strictly according to the third face-closing, the first face-closing is leveled up, the second face-closing controls the elevation and the 4% slope of the two sides, and the third face-closing is performed with press polish; and covering the concrete within 12 hours after the concrete reaches an initial setting state, moisturizing and curing, covering the geotextile on the surface of the concrete, and watering and curing to keep the surface of the concrete moist, wherein the curing of the concrete can not be less than 7 days.
Sixthly, continuously paving an isolation layer 13 from one end of the base 10 to the other end of the base, wherein the center of the isolation layer 13 is consistent with that of the base 10, no lap joint or seam joint exists in the range of the prefabricated track slab 11, and the isolation layer 13 is cut off after the prefabricated track slab 11 is cast 5cm wider than the edge of the prefabricated track slab; the flatness of the isolation layer (13) is controlled according to 10mm/1 m; rubber buffer pads are adhered to the periphery of the limiting groove, the top surface of the buffer pad layer is flush with the surface of the base 10, and then edge sealing is carried out by using a transparent adhesive tape, so that the defects of upwarping, hollowing, wrinkling, delaminating or untight sealing at the joint and the periphery are avoided.
Seventhly, conveying the reinforcing steel bar net piece to a laying position by using a track laying unit and then laying, wherein the center of the net piece is consistent with that of the base 10, the distance between the longitudinal end of the reinforcing steel bar net piece and the side line of the prefabricated track plate 11 is 15mm, and the distance between the longitudinal end of the reinforcing steel bar net piece and the side line of the prefabricated track plate 11 on one side is 60 mm; the quantity of the cushion blocks is not less than 4 per square meter and the cushion blocks are evenly distributed.
Step eight, paving the prefabricated track slabs 11 by matching the operation surface track paving unit, and dropping the slabs by taking the lofted side line as a reference, wherein the adjacent prefabricated track slabs 11 are spaced by 2 square timbers of 60mm and are preliminarily positioned; after the prefabricated track slab 11 is placed stably, the lifting lugs are removed, and three adjusters and transverse supports are installed; after the three adjusters are screwed, the prefabricated track plate 11 is lifted and taken out of the skid; the coarse paving precision of the precast slabs is controlled, the front and rear allowable deviation is 10mm, and the left and right allowable deviation is 10 mm.
Ninthly, 4 pressing devices are arranged on each prefabricated track board 11, one pressing device is placed on each two rail bearing platforms, the middle of each pressing device is aligned with the embedded sleeve of the base, and the distance is 1200 mm. The hold-down device cross beam must be in a perpendicular relationship with the prefabricated track slab 11. After the pressing device is installed, the edge sealing templates at the periphery are fixed through the pressing device screw rods, the close adhesion between the edge sealing templates and the edges of the periphery of the track slab and the base is guaranteed, and if the base is uneven, foam rubber is poured between the pre-templates of the base to guarantee the sealing performance.
In the step (c), when the transport vehicle arrives at a pouring site, the transport vehicle rotates at a high speed for 20-30 s to unload materials and carry out an entrance inspection on self-compacting concrete, after the materials are qualified, the materials are unloaded into a track flat car stirring tank through a discharging pipe, the materials are transported to a pouring section along the track vehicle, the track laying unit is used for hoisting the stirring tank to a specified position and aligning the stirring tank with a funnel, a valve is opened to carry out self-compacting concrete pouring, and when the concrete discharged from all grout discharging holes is consistent with a self-compacting concrete body, the pouring can be stopped; and after the mould is removed, spraying a curing agent, wrapping by geotextile or covering a curing film with a moisturizing curing measure is timely carried out on the self-compacting concrete, and the cumulative time of moisturizing curing is not less than 14 d.
The step comprises the steps of installing the fastener after the strength of the self-compacting concrete of the isolation layer 13 reaches 70% of the design strength, and installing the steel rail by adopting a manual rail-reversing mode after the installation of the fastener is finished.
Claims (10)
1. The construction method of the ballastless track of the precast slab of the urban rail transit underground line comprises the following steps:
firstly, measuring and setting a base mark; processing the substrate; mounting a running rail (15); binding the steel bars of the base (10), and installing a limiting groove template and a side mold; fifthly, pouring concrete on the base (10) and maintaining; sixthly, laying an isolation layer (13) and a rubber buffer pad; seventhly, paving a mesh sheet of the adjusting layer (12); eighthly, laying a prefabricated track slab (11) and finely adjusting; ninthly, installing a pressing device and a peripheral edge sealing template; injecting a regulating layer (12) at the red (R) for self-compacting concrete and curing; mounting a steel rail component;
adopting a single-well forward laying method, namely taking one interval of two stations as a track laying unit, taking a track laying base as a starting point, and carrying out forward base construction by utilizing track materials such as base track panel wells or shield underground reinforcing steel bars, templates and the like; after the strength of the base reaches 75% of the design strength, the base track panel well or the shield underground track plate, the steel rail and other track materials are utilized to lay the forward track plate and pour self-compacting concrete, the self-compacting concrete can bear the load after the strength reaches 100%, and the progress index is 40 m/d;
or a double-well forward laying method is adopted, namely, two well mouths at two ends of the interval are respectively used as feed openings to be constructed in parallel, the preposed well mouth is used for base pouring operation by using a tire type distributing machine, the postposed well mouth is used for all construction except the base by using a track laying machine set, and the progress index is 50 m/d.
2. The construction method of the ballastless track of the precast slab of the urban rail transit underground line according to claim 1, characterized in that: the method comprises the following steps that firstly, the line center is taken as a reference, a measuring base mark is positioned on the left side and the right side of a substrate at an offset distance of 1100mm in a direction perpendicular to the line direction, 9.6m substrate plates are positioned along the line direction, and the measuring base mark is a steel bar with the diameter of 12mm and the length of 400 mm.
3. The construction method of the ballastless track of the precast slab of the urban rail transit underground line according to claim 1, characterized in that: chiseling a tunnel foundation by using an air compressor and an air pick, chiseling after removing a loose and weak layer of the foundation and cleaning cement mortar and laitance, wherein the chiseling depth of the foundation is 5-10 mm, the longitudinal and transverse distances are less than or equal to 150mm, the new surface of the foundation in the treatment range is not less than 75%, and the surface of the cleaned foundation is an obvious concave-convex surface; and 4 groups of expansion anchor bolts (14) are arranged on the substrate, the distance between every two 4 groups of expansion anchor bolts along the line row is 600mm, the implantation foundation depth is 135mm, the exposure height is 110mm, and the bolt tightening torque is not less than 125 N.m.
4. The construction method of the ballastless track of the precast slab of the urban rail transit underground line according to claim 1, characterized in that: step three, paying off the running rail (15) by adopting a method of elastically arranging ink lines, and taking the central line of the rail as a reference, wherein the span of the running rail of the rectangular tunnel is 3.1m, and the span of the running rail of the circular tunnel is 4.6 m; punching a tunnel bottom plate by using an electric hammer, and burying 4 expansion bolts in each steel buttress, wherein the burial depth is 60-70 mm; the steel buttress interval is 1.2 ~ 1.5m, meets rail joint position and adds and establishes the steel buttress.
5. The construction method of the ballastless track of the precast slab of the urban rail transit underground line according to claim 1, characterized in that: fourthly, arranging a section of base (10) on each 2 prefabricated track slabs (11) along the longitudinal direction of the line, wherein the length of each base (10) is 9.6 m; an expansion joint with the width of 30mm is arranged between the adjacent bases (10), and the center of the expansion joint is aligned with the center of the slab joint of the adjacent prefabricated track slab (11);
side form installation, marking by measuring the outward return of one side of the steel bar positioning pile by 100mm, carrying out elastic line by using a long pull line at the marked position of two sides of a 9.6m base, carrying out base side form installation, and implanting into two sides of a template
L is 100mm sideshift steel bar pile, and the distance is 700mm one (two 1.5m templates) the both sides template line guarantees 2400mm width. And after the template is installed, the template is fixed by adopting an inclined support. One end of the inclined support is fixed on the bottom plate, and the other end supports the upper part of the side template, so that the template linearity can be adjusted by preventing the template from expanding and moving;
mounting a limiting groove template, determining the position of a limiting groove according to the measuring and positioning pile, and taking the inward distances of 0.815m and 3.17m from the two ends of the expansion joint as the central position of the limiting groove; adjusting the position of the limiting groove template, measuring the downward return of the steel bar positioning pile by 100mm, longitudinally tensioning the string, marking the limiting groove, and tensioning the string through the transverse line to obtain the top surface elevation line of the limiting groove template; the template stability was checked.
6. The construction method of the ballastless track of the precast slab of the urban rail transit underground line according to claim 1, characterized in that: fifthly, after the commercial concrete tank car is transported to a track laying base, the tank car is required to rotate at a high speed for 20-30 seconds to unload materials for slump test, the slump test is required to be 180 +/-20 mm, the materials are discharged into a hopper through a discharge port after the slump test is qualified, and the materials are pulled to a construction operation surface by a rail car; when concrete is distributed, the four corners of the limiting groove are poured firstly, so that concrete at the four corners of the limiting groove is prevented from cracking; the concrete is poured for one-time forming, no construction joint is left in the middle, and the periphery of the groove is vibrated compactly; the concrete is strictly according to the third face-closing, the first face-closing is leveled up, the second face-closing controls the elevation and the 4% slope of the two sides, and the third face-closing is performed with press polish; and covering the concrete within 12 hours after the concrete reaches an initial setting state, moisturizing and curing, covering the geotextile on the surface of the concrete, and watering and curing to keep the surface of the concrete moist, wherein the curing of the concrete can not be less than 7 days.
7. The ballastless track construction method for the precast slabs of the urban rail transit underground line according to claim 1, is characterized in that: according to the method, an isolation layer (13) is continuously laid from one end of a base (10) to the other end, the center of the isolation layer (13) is consistent with that of the base (10), no lap joint or seam joint exists in the range of a prefabricated track board (11), the isolation layer (13) is cut off after being poured 5cm away from the edge of the prefabricated track board (11), the flatness of the isolation layer (13) is controlled according to 10mm/1m, rubber cushion pads around a limiting groove are pasted, the top surfaces of the cushion pads are flush with the surface of the base (10), transparent adhesive tapes are used for edge sealing, and the defects of upwarp, hollowing, wrinkling, delamination or untight sealing are not caused at the seam and the periphery.
8. The ballastless track construction method for the precast slabs of the urban rail transit underground line according to claim 1, is characterized in that: seventhly, conveying the reinforcing steel bar net sheets to a laying position by using a track laying unit, then laying, wherein the centers of the net sheets are consistent with the center of the base (10), the longitudinal ends of the reinforcing steel bar net sheets are 15mm away from the side line of the prefabricated track plate (11), the side line of the prefabricated track plate (11) on one side of the transverse distance is 60mm, and the number of the cushion blocks is not less than 4 per square meter and is uniformly distributed.
9. The construction method of the ballastless track of the precast slab of the urban rail transit underground line according to claim 1, characterized in that: step eight, paving the prefabricated track slabs (11) by matching the operation surface track paving unit, and dropping the slabs by taking the lofted sidelines as a reference, wherein the adjacent prefabricated track slabs (11) are spaced by 2 square timbers of 60mm and are preliminarily positioned; after the prefabricated track slab (11) is placed stably, the lifting lugs are removed, and three adjusters and transverse supports are installed; after the three adjusters are screwed, the prefabricated track plate (11) is lifted and taken out of the skid; the coarse paving precision of the precast slabs is controlled, the front and rear allowable deviation is 10mm, and the left and right allowable deviation is 10 mm.
10. The ballastless track construction method for the precast slabs of the urban rail transit underground line according to claim 1, is characterized in that: in the step (c), when the transport vehicle arrives at a pouring site, the transport vehicle rotates at a high speed for 20-30 s to unload materials and carry out an entrance inspection on self-compacting concrete, after the materials are qualified, the materials are unloaded into a track flat car stirring tank through a discharging pipe, the materials are transported to a pouring section along the track vehicle, the track laying unit is used for hoisting the stirring tank to a specified position and aligning the stirring tank with a funnel, a valve is opened to carry out self-compacting concrete pouring, and when the concrete discharged from all grout discharging holes is consistent with a self-compacting concrete body, the pouring can be stopped; and after the mold is removed, spraying curing agent, wrapping with geotextile or covering a curing film with a moisturizing curing measure is timely adopted for the self-compacting concrete, and the accumulated time of moisturizing curing is not less than 14 d.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115595836A (en) * | 2022-11-08 | 2023-01-13 | 中铁五局集团第六工程有限责任公司（Cn） | Construction method for subsection process of subway precast track slab track bed |
| CN115627665A (en) * | 2022-12-06 | 2023-01-20 | 中国铁路设计集团有限公司 | Construction method of fast-supporting integrally-assembled prefabricated track structure |
-
2021
- 2021-11-16 CN CN202111353514.1A patent/CN114645490A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115595836A (en) * | 2022-11-08 | 2023-01-13 | 中铁五局集团第六工程有限责任公司（Cn） | Construction method for subsection process of subway precast track slab track bed |
| CN115595836B (en) * | 2022-11-08 | 2024-04-30 | 中铁五局集团第六工程有限责任公司 | Construction method for sub-section process of underground iron prefabricated track slab track bed |
| CN115627665A (en) * | 2022-12-06 | 2023-01-20 | 中国铁路设计集团有限公司 | Construction method of fast-supporting integrally-assembled prefabricated track structure |
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