CN112900161A - Construction method of integral track bed of boot-type elastic supporting block of tunnel - Google Patents
Construction method of integral track bed of boot-type elastic supporting block of tunnel Download PDFInfo
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- CN112900161A CN112900161A CN202110109028.9A CN202110109028A CN112900161A CN 112900161 A CN112900161 A CN 112900161A CN 202110109028 A CN202110109028 A CN 202110109028A CN 112900161 A CN112900161 A CN 112900161A
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- 238000010276 construction Methods 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 claims abstract description 19
- 239000010426 asphalt Substances 0.000 claims abstract description 15
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 11
- 238000005259 measurement Methods 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims abstract description 7
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 4
- 239000003550 marker Substances 0.000 claims description 4
- 239000002390 adhesive tape Substances 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 238000009499 grossing Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 230000035515 penetration Effects 0.000 claims description 3
- 238000013102 re-test Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000003014 reinforcing effect Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B29/00—Laying, rebuilding, or taking-up tracks; Tools or machines therefor
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Machines For Laying And Maintaining Railways (AREA)
Abstract
The invention relates to the technical field of tunnel construction, in particular to a construction method of a tunnel sleeve shoe type elastic supporting block integral ballast bed. The method comprises the following steps: s1, construction preparation: arranging construction machines and sites; s2, cleaning a bed base; s3, construction measurement and pile setting control; s4, paving the roadbed reinforcing steel bars: the reinforcing steel bar nets of the ballast bed are formed by processing outside the holes and are paved by hoisting in the holes, and a transverse expansion joint asphalt plate is arranged between every two reinforcing steel bar nets; s5, hoisting a track bent; s6, adjusting and locking the track bent; s7, installing an expansion joint asphalt slab; s8, pouring roadbed concrete; s9, vibrating, plastering and forming; s10, preserving health; s12, dismantling the track bent; and S13, transferring the tool. The working procedures of the construction method are reasonable in spacing distance, the connection and matching are compact and orderly, the whole process is in parallel line production, and the construction efficiency is improved. The invention is mainly applied to the construction of the tunnel shoe type elastic supporting block integral ballast bed.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a construction method of a tunnel sleeve shoe type elastic supporting block integral ballast bed.
Background
In recent years, in order to adapt to the development direction of high speed and heavy load of the transportation industry, the elastic support block integral track bed is widely applied to the aspects of large and large railway tunnels, urban rail transit, special sections of high-speed railways and the like. However, the construction precision requirement of the integral ballast bed of the sleeve shoe type elastic supporting block is high, and the construction difficulty is high. The existing construction technology has poor effect and is difficult to achieve high-quality construction effect.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a construction method of the integral track bed of the sleeve shoe type elastic supporting block of the tunnel, which has simple construction procedures, easy mastering and strong construction continuity; the distance between the working procedures is reasonable, the connection and the matching are compact and orderly, the whole process is parallel to the line production, and the construction speed is high.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the construction method of the integral track bed of the boot-type elastic supporting block of the tunnel comprises the following steps:
s1, construction preparation: arranging construction machines and sites;
s2, cleaning a bed base;
s3, construction measurement and pile setting control;
s4, paving the roadbed reinforcing steel bars: the reinforcing steel bar nets of the ballast bed are formed by processing outside the holes and are paved by hoisting in the holes, and a transverse expansion joint asphalt plate is arranged between every two reinforcing steel bar nets;
s5, hoisting a track bent;
s6, adjusting and locking the track bent;
s7, installing an expansion joint asphalt slab;
s8, pouring roadbed concrete;
s9, vibrating, plastering and forming;
s10, preserving health;
s12, dismantling the track bent;
and S13, transferring the tool.
In the step S2, the surface of the tunnel bottom filling concrete in the construction section is roughened and washed clean with high-pressure water, so as to ensure that the ballast bed base is free of impurities and accumulated water.
In step S3, the tunnel penetration measurement is encrypted based on the high-speed control piles embedded every 200m, the control piles are added according to a straight line of 100m and a curve of 50m, the marker piles are arranged on the central line of the line, the distance between the marker piles is 6.25m on the straight line, and the adjustment is performed within the range of the two control piles for the deviation between 5m on the curve.
In step S6, the track bent is roughly adjusted to be in place, and then finely adjusted and positioned.
When coarse adjustment is carried out in place, the height is fixed by a self-propelled gantry crane, then the central line is adjusted by a theodolite by a 'threading method', the central line of the track panel is superposed with the central line of the line, only the front end of each track panel is adjusted, and then the rear end of the next track panel is butted with the closed end of the previous track panel.
After a plurality of rail panels are connected into a rail, fine adjustment and locking of rail surface systems of the rail panels are completed by supporting legs of the bent and a rail rear locking device together, wherein a rail gauge and a rail bottom slope are formed during processing of the combined bent and are constant values, and no adjustment is performed during construction. The height and the level of the rail surface are adjusted by a left supporting leg bolt and a right supporting leg bolt, the rail direction is adjusted by a rail direction locking device, specifically, a precise level gauge is matched with a tower ruler supporting leg to firstly carry out retest adjustment on the elevation of the rail surface, and the inner rail is used as the standard for utilizing the high-speed rail surface level of the rail ruler. And (3) retesting and adjusting the central line of the track panel structure by utilizing the theodolite in cooperation with the track direction locking device, adjusting individual point positions by utilizing a method of pulling a string of 10m, eliminating a triangular pit, leveling the right track at the moved point position by utilizing a track ruler until the precision of the row frame meets the design requirement, and checking and locking all the supporting legs and the track direction locking device.
In the step S7, the expansion joint asphalt plates are arranged at intervals of 6.25m, placed in the centers of the two support blocks and perpendicular to the central line of the line, the upper wedge-shaped plate is removed after the concrete is initially set, and the gaps are filled with asphalt mortar.
In the step S8, the cloth is required to be uniformly and fully distributed during casting, so that the bent frames and the supporting blocks are not polluted, and the joints between the supporting blocks and the rubber boots are tightly sealed by wide adhesive tapes to prevent concrete from polluting the supporting block rail bearing platform or entering the boots.
In the step S9, the vibration of the concrete under the support block is enhanced during the concrete construction, so as to avoid vibration leakage or over-vibration, the concrete surface does not sink significantly any more, so that air bubbles do not appear, and it is preferable that cement paste is spread out on the surface, after the concrete is poured, the surface of the track bed needs to be smoothed, the surface of the track bed is smoothed according to 2% of a herringbone slope, and particularly, at one side end of the lateral track center in the support block, a gap of 2mm from the concrete surface of the track bed to the lower edge of the casing shoe needs to be ensured, and the smoothing work of the concrete surface near the support leg and below the bent frame cross beam needs to be well processed.
And in the step S12, removing the track bent after the strength of the track bed concrete reaches 5 Mpa.
Compared with the prior art, the invention has the beneficial effects that:
by adopting the construction method, the precision is easy to control and guarantee, and the measuring tool is simple; the construction continuity is strong; the distance between each process is reasonable, the connection and matching are compact and orderly, the whole process is in parallel line production, and the construction efficiency is obviously improved; the construction procedure is simple and easy to master. The construction method is suitable for the construction of the rubber sleeve shoe type elastic supporting block integral track bed adopted by the engineering of railway tunnels, urban light rail traffic underground railways and the like.
Drawings
FIG. 1 is a schematic view of the construction process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the construction method of the tunnel shoe type elastic supporting block integral ballast bed comprises the following steps:
s1, construction preparation: the construction machine and the site are arranged. In order to avoid mutual interference, all the working procedures are closely connected and orderly carried out, and proper distances are kept among the working procedures, various construction machine tools and equipment mainly comprise a gantry crane, a coupling type track bent frame, a movable assembly platform, a concrete delivery pump and the like, and are reasonably arranged;
s2, cleaning a bed base;
s3, construction measurement and pile setting control;
s4, paving the roadbed reinforcing steel bars: the roadbed reinforcing mesh is formed by processing outside a hole and paved by hoisting in the hole, a transverse expansion joint asphalt plate is arranged between every two reinforcing meshes, and a C40 concrete cushion is used for supporting a cushion under each reinforcing mesh to perform a test piece test on the reinforcing mesh;
s5, hoisting the track bent frame, and placing the bearing block nameplates on the movable assembly platform at equal intervals towards the outer side of the track. Hoisting an empty rail bent frame by using a gantry crane to move above the assembling platform, and forming a small rail bent frame with the length of 6.25m by using a quick fastener through a hanging basket on the rail bent frame after accurate alignment;
s6, adjusting and locking the track bent;
s7, installing an expansion joint asphalt slab;
s8, pouring roadbed concrete;
s9, vibrating, plastering and forming;
s10, preserving health;
s12, dismantling the track bent;
and S13, transferring the tool.
Preferably, in step S2, the construction section tunnel bottom filling concrete surface is roughened and washed clean with high-pressure water to ensure that the ballast bed base is free of impurities and accumulated water.
Preferably, in step S3, the tunnel penetration measurement is encrypted based on a high-speed control pile embedded every 200m, the control piles are added according to a straight line of 100m and a curve of 50m, the stakes are arranged on the middle line of the line, the distance between the stakes is 6.25m on the straight line, and the adjustment is performed within the range of the two control piles according to the deviation between 5m on the curve. Monitoring and measuring, observing the change of the bent rail surface system, and immediately correcting the overproof condition.
Preferably, in step S6, the track bent is roughly adjusted to be in place, and then finely adjusted to be positioned.
Preferably, when coarse adjustment is carried out in place, the height is set by a self-propelled gantry crane, then the central line is adjusted by a theodolite through a 'threading method', the central line of the track panel is superposed with the central line of the line, only the front end of each track panel is adjusted, and then the rear end of the next track panel is butted with the closed end of the previous track panel. The joints are connected by adopting clamping plates, meanwhile, the rail gap is kept between 6 mm and 10mm according to the actual condition, the end position of the rail panel is adjusted according to the accurate mileage of 100m, the rail direction locking device is locked, and after the rough adjustment is finished, the height and the center line error of the rail panel are controlled within 5 mm.
Preferably, after a plurality of rail panels are connected into a rail, fine adjustment and locking of rail surface systems of the rail panels are completed by supporting legs of the panel frames and rail rear locking devices together, wherein the rail gauge and a rail bottom slope are formed during processing of the combined panel frames and are constant values, and no adjustment is performed during construction. The height and the level of the rail surface are adjusted by a left supporting leg bolt and a right supporting leg bolt, the rail direction is adjusted by a rail direction locking device, specifically, a precise level gauge is matched with a tower ruler supporting leg to firstly carry out retest adjustment on the elevation of the rail surface, and the inner rail is used as the standard for utilizing the high-speed rail surface level of the rail ruler. And (3) retesting and adjusting the central line of the track panel structure by utilizing the theodolite in cooperation with the track direction locking device, adjusting individual point positions by utilizing a method of pulling a string of 10m, eliminating a triangular pit, leveling the right track at the moved point position by utilizing a track ruler until the precision of the row frame meets the design requirement, and checking and locking all the supporting legs and the track direction locking device.
Preferably, in step S7, the expansion joint asphalt slab is placed at every 6.25m and placed in the center of the two support blocks, perpendicular to the central line of the track, the upper wedge-shaped slab is removed after the concrete is initially set, the gap is filled with asphalt mortar, and the installation of the expansion joint slab needs to be firm, so as to ensure no deformation and no mold running, thereby ensuring the track bed filling quality. The lower part of the asphalt panel consisted of 2600mm by 20mm by 700mm asphalt-impregnated panels and 2600mm by 20mm by 60mm wedge-shaped wood panels on the upper part.
Preferably, in step S8, the concrete for casting is prepared by concrete material, mixed by concrete material and mixed, and then the concrete pump is transported, the concrete pump is located at the rear part of the mobile assembly platform, the concrete pipeline is arranged above the bent frame, because the steel bar support is separated from the bent frame and arranged above the cable trough, the material is distributed uniformly and compactly during casting, the bent frame and the supporting block are not polluted, and the joint between the supporting block and the rubber boot is sealed tightly by the wide adhesive tape to prevent the concrete from polluting the rail bearing platform of the supporting block or entering the boot. And sampling a test piece of the concrete for pouring.
Preferably, in step S9, the vibration of the concrete under the support block is enhanced during the concrete construction to avoid leakage vibration or over vibration, the concrete surface does not significantly sink any more, no air bubbles appear, and cement slurry is preferably spread on the surface, after the concrete is poured, the surface of the track bed needs to be smoothed, the surface of the track bed is smoothed according to 2% of a herringbone slope, and particularly, the gap between the concrete surface of the track bed and the lower edge of the casing shoe of 2mm at one side end of the lateral track center in the support block needs to be ensured, and the smoothing work of the concrete surface near the support leg and below the bent frame cross beam needs to be processed. And moving the control pile to the concrete surface of the ballast bed, and customizing the control pile into a permanent control pile according to a relevant measuring rule.
Preferably, in step S12, the track bent is removed after the strength of the track bed concrete reaches 5 Mpa. The machine moves forward to enter a second group of bent frames for circulation, and the dismantling sequence is as follows: loosening clamping plate between rail panels → loosening quick suspension fastener → dismantling template → loosening rail-direction locking device → loosening leg bolt → dismantling template → gantry crane hoisting bent frame
In order to ensure the construction precision and reduce the error to the maximum extent, the overhead group of the track panel is leveled by a vertical frame, concrete is not poured, and the track panel is left for circulating pouring.
The construction of the integral track bed of the shoe-type elastic supporting block is that a track bent is used, after track bed reinforcing steel bars are bound, the steel rail bent sleeved with the shoe-type elastic supporting block is put in place, and the track bed concrete is poured in sections after the horizontal elevation of the direction of the track is measured and adjusted to reach the design standard. In the construction process of the integral ballast bed:
the track bent is made of 50kg/m steel rails. The design period is 70kg/m, the conversion principles of rail top elevation, rail center distance and the like of a rail with 50kg/m need to be applied to replace a rail with 70kg/m, and the conversion principles are realized by controlling the size of the support block cradle.
The lifting and locking principle of the rail bent frame supporting and locking system is realized by a transverse and longitudinal locking screw rod.
The rail adjusting principle of railway line construction is utilized to accurately adjust and position the rail bent frame so as to accurately position and embed the elastic supporting block.
Although only the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and all changes are encompassed in the scope of the present invention.
Claims (10)
1. The construction method of the integral track bed of the boot-type elastic supporting block of the tunnel is characterized by comprising the following steps:
s1, construction preparation: arranging construction machines and sites;
s2, cleaning a bed base;
s3, construction measurement and pile setting control;
s4, paving the roadbed reinforcing steel bars: the reinforcing steel bar nets of the ballast bed are formed by processing outside the holes and are paved by hoisting in the holes, and a transverse expansion joint asphalt plate is arranged between every two reinforcing steel bar nets;
s5, hoisting a track bent;
s6, adjusting and locking the track bent;
s7, installing an expansion joint asphalt slab;
s8, pouring roadbed concrete;
s9, vibrating, plastering and forming;
s10, preserving health;
s12, dismantling the track bent;
and S13, transferring the tool.
2. The construction method of the integral ballast bed of the shoe-type elastic support block of the tunnel according to claim 1, wherein: in the step S2, the surface of the tunnel bottom filling concrete in the construction section is roughened and washed clean with high-pressure water, so as to ensure that the ballast bed base is free of impurities and accumulated water.
3. The construction method of the integral ballast bed of the shoe-type elastic support block of the tunnel according to claim 1, wherein: in step S3, the tunnel penetration measurement is encrypted based on the high-speed control piles embedded every 200m, the control piles are added according to a straight line of 100m and a curve of 50m, the marker piles are arranged on the central line of the line, the distance between the marker piles is 6.25m on the straight line, and the adjustment is performed within the range of the two control piles for the deviation between 5m on the curve.
4. The construction method of the integral ballast bed of the shoe-type elastic support block of the tunnel according to claim 1, wherein: in step S6, the track bent is roughly adjusted to be in place, and then finely adjusted and positioned.
5. The construction method of the integral ballast bed of the shoe type elastic supporting block of the tunnel according to claim 4, wherein: when coarse adjustment is carried out in place, the height is fixed by a self-propelled gantry crane, then the central line is adjusted by a theodolite by a 'threading method', the central line of the track panel is superposed with the central line of the line, only the front end of each track panel is adjusted, and then the rear end of the next track panel is butted with the closed end of the previous track panel.
6. The construction method of the integral ballast bed of the shoe type elastic supporting block of the tunnel according to claim 4, wherein: after a plurality of rail panels are connected into a rail, fine adjustment and locking of rail surface systems of the rail panels are completed by supporting legs of the bent and a rail rear locking device together, wherein a rail gauge and a rail bottom slope are formed during processing of the combined bent and are constant values, and no adjustment is performed during construction. The height and the level of the rail surface are adjusted by a left supporting leg bolt and a right supporting leg bolt, the rail direction is adjusted by a rail direction locking device, specifically, a precise level gauge is matched with a tower ruler supporting leg to firstly carry out retest adjustment on the elevation of the rail surface, and the inner rail is used as the standard for utilizing the high-speed rail surface level of the rail ruler. And (3) retesting and adjusting the central line of the track panel structure by utilizing the theodolite in cooperation with the track direction locking device, adjusting individual point positions by utilizing a method of pulling a string of 10m, eliminating a triangular pit, leveling the right track at the moved point position by utilizing a track ruler until the precision of the row frame meets the design requirement, and checking and locking all the supporting legs and the track direction locking device.
7. The construction method of the integral ballast bed of the shoe-type elastic support block of the tunnel according to claim 1, wherein: in the step S7, the expansion joint asphalt plates are arranged at intervals of 6.25m, placed in the centers of the two support blocks and perpendicular to the central line of the line, the upper wedge-shaped plate is removed after the concrete is initially set, and the gaps are filled with asphalt mortar.
8. The construction method of the integral ballast bed of the shoe-type elastic support block of the tunnel according to claim 1, wherein: in the step S8, the cloth is required to be uniformly and fully distributed during casting, so that the bent frames and the supporting blocks are not polluted, and the joints between the supporting blocks and the rubber boots are tightly sealed by wide adhesive tapes to prevent concrete from polluting the supporting block rail bearing platform or entering the boots.
9. The construction method of the integral ballast bed of the shoe-type elastic support block of the tunnel according to claim 1, wherein: in the step S9, the vibration of the concrete under the support block is enhanced during the concrete construction, so as to avoid vibration leakage or over-vibration, the concrete surface does not sink significantly any more, so that air bubbles do not appear, and it is preferable that cement paste is spread out on the surface, after the concrete is poured, the surface of the track bed needs to be smoothed, the surface of the track bed is smoothed according to 2% of a herringbone slope, and particularly, at one side end of the lateral track center in the support block, a gap of 2mm from the concrete surface of the track bed to the lower edge of the casing shoe needs to be ensured, and the smoothing work of the concrete surface near the support leg and below the bent frame cross beam needs to be well processed.
10. The construction method of the integral ballast bed of the shoe-type elastic support block of the tunnel according to claim 1, wherein: and in the step S12, removing the track bent after the strength of the track bed concrete reaches 5 Mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110109028.9A CN112900161A (en) | 2021-01-27 | 2021-01-27 | Construction method of integral track bed of boot-type elastic supporting block of tunnel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110109028.9A CN112900161A (en) | 2021-01-27 | 2021-01-27 | Construction method of integral track bed of boot-type elastic supporting block of tunnel |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0894897A1 (en) * | 1997-07-07 | 1999-02-03 | Walo Bertschinger AG | Process for making a track structure |
| CN103410062A (en) * | 2013-08-16 | 2013-11-27 | 中铁二十一局集团有限公司 | Method for constructing monolithic roadbed by using single railway tunnel bracket type steel rail way |
| CN104775340A (en) * | 2015-03-24 | 2015-07-15 | 中交一航局第四工程有限公司 | Intra-tunnel elastic support block type ballastless track dual-line construction process |
| CN110541332A (en) * | 2019-08-14 | 2019-12-06 | 中铁六局集团有限公司 | construction method of railway integral ballast bed in narrow tunnel |
| CN111648169A (en) * | 2020-05-26 | 2020-09-11 | 中铁六局集团有限公司 | Elastic supporting block type integral ballast bed rapid construction method |
| CN111794018A (en) * | 2020-07-15 | 2020-10-20 | 中铁九局集团第六工程有限公司 | Construction method of ballastless track with replaceable supporting blocks by tunnel sleeve shoe method |
-
2021
- 2021-01-27 CN CN202110109028.9A patent/CN112900161A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0894897A1 (en) * | 1997-07-07 | 1999-02-03 | Walo Bertschinger AG | Process for making a track structure |
| CN103410062A (en) * | 2013-08-16 | 2013-11-27 | 中铁二十一局集团有限公司 | Method for constructing monolithic roadbed by using single railway tunnel bracket type steel rail way |
| CN104775340A (en) * | 2015-03-24 | 2015-07-15 | 中交一航局第四工程有限公司 | Intra-tunnel elastic support block type ballastless track dual-line construction process |
| CN110541332A (en) * | 2019-08-14 | 2019-12-06 | 中铁六局集团有限公司 | construction method of railway integral ballast bed in narrow tunnel |
| CN111648169A (en) * | 2020-05-26 | 2020-09-11 | 中铁六局集团有限公司 | Elastic supporting block type integral ballast bed rapid construction method |
| CN111794018A (en) * | 2020-07-15 | 2020-10-20 | 中铁九局集团第六工程有限公司 | Construction method of ballastless track with replaceable supporting blocks by tunnel sleeve shoe method |
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Application publication date: 20210604 |