CN111270620A - Replaceable rockfall protection shed tunnel for railway bridge and construction method thereof - Google Patents
Replaceable rockfall protection shed tunnel for railway bridge and construction method thereof Download PDFInfo
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- CN111270620A CN111270620A CN202010124999.6A CN202010124999A CN111270620A CN 111270620 A CN111270620 A CN 111270620A CN 202010124999 A CN202010124999 A CN 202010124999A CN 111270620 A CN111270620 A CN 111270620A
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- 238000010276 construction Methods 0.000 title claims abstract description 28
- 239000011374 ultra-high-performance concrete Substances 0.000 claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 11
- 239000010959 steel Substances 0.000 claims abstract description 11
- 239000004575 stone Substances 0.000 claims abstract description 6
- 239000010410 layer Substances 0.000 claims description 34
- 239000011435 rock Substances 0.000 claims description 15
- 239000002689 soil Substances 0.000 claims description 7
- 239000010426 asphalt Substances 0.000 claims description 6
- 229920000642 polymer Polymers 0.000 claims description 6
- 239000002023 wood Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 238000010025 steaming Methods 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 3
- 239000002861 polymer material Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 3
- 239000004567 concrete Substances 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000006378 damage Effects 0.000 description 4
- 230000003116 impacting effect Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F7/00—Devices affording protection against snow, sand drifts, side-wind effects, snowslides, avalanches or falling rocks; Anti-dazzle arrangements ; Sight-screens for roads, e.g. to mask accident site
- E01F7/04—Devices affording protection against snowslides, avalanches or falling rocks, e.g. avalanche preventing structures, galleries
- E01F7/045—Devices specially adapted for protecting against falling rocks, e.g. galleries, nets, rock traps
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The invention relates to a replaceable falling-stone protective shed for a railway bridge and a construction method thereof, wherein the replaceable falling-stone protective shed for the railway bridge comprises a plurality of independent shed segments along the bridge direction, and each segment is an independent single shed; the single shed tunnel comprises a plurality of arc-shaped hollow pipe pieces at the top, upright posts with vertical two sides and a connecting plate below the upright posts, wherein all adjacent members are connected with each other, and the inner side of the connecting plate extends into the lower part of a wing plate of the railway box girder and is connected with the lower part of the wing plate. The main stressed member of the invention adopts an ultra-high performance concrete material, the durability of the main stressed member is far higher than that of common concrete and steel, and the service life of the main stressed member meets the requirement of a main structure for 100 years; the main components can be normally used after being partially repaired or replaced after being damaged, and the whole life cycle design technology is realized.
Description
Technical Field
The invention belongs to the technical field of bridge engineering construction, and particularly relates to a replaceable rockfall protection shed tunnel for a railway bridge and a construction method thereof.
Background
Newly-built railways in the severe mountainous areas of the midwestern province mostly pass through V-shaped gullies, hillsides are steep, and dangerous rock falling rocks are distributed mostly. According to the distribution rule of rockfall movement tracks, a bridge connected with a tunnel portal is often a place with the highest rockfall risk, and a railway bridge generally has the characteristics of high speed, high-density operation and high safety requirements, so that once the railway bridge is impacted by rockfall, great economic loss can be caused, and even disastrous consequences can be caused.
Although the open cut tunnel extends and the top of the open cut tunnel is covered with soil, the falling rocks can be effectively prevented from impacting a bridge structure at the opening of the tunnel to cause damage, the V-shaped valley in the mountainous area generally does not have the pier supporting condition when the open cut tunnel extends. Therefore, the replaceable rockfall protection shed tunnel for the railway bridge is researched and developed, the shed tunnel and the railway box girder are combined into a whole, the application is not limited by the terrain condition under the bridge, the bridge at the tunnel portal can be prevented from being influenced by dangerous rockfall disasters, and the railway operation safety is guaranteed.
The railway bridge shed tunnel bears rockfall impact load more frequently, but the slope of the mountain at the side of the tunnel is provided with the active and passive protective nets, and then mainly takes small rockfall impact, so that the risk of large rockfall impact exists under extreme natural conditions. No matter be small-size or large-scale rockfall all can produce the destruction of certain degree to whole protection shed tunnel structure, develop a novel shed tunnel and can adapt to different topography condition restrictions and support at railway box girder top, have removable prosthetic function again after structure or buffering additional structure damage, can show the technological advance and the economic rationality that improve rockfall protection shed tunnel.
Disclosure of Invention
The invention aims to provide a replaceable rockfall protection shed tunnel for a railway bridge and a construction method thereof, and solves the problems of complex engineering, high implementation difficulty, high investment, great influence by terrain and the like of the traditional dangerous rockfall comprehensive treatment scheme.
The technical scheme adopted by the invention is as follows:
removable formula of railway bridge stone protection shed tunnel that falls, its characterized in that:
the replaceable falling rock protection shed tunnel for the railway bridge comprises a plurality of independent shed tunnel sections along the bridge direction, and each section is an independent single shed tunnel;
the single shed tunnel comprises a plurality of arc-shaped hollow pipe pieces at the top, upright posts with vertical two sides and a connecting plate below the upright posts, wherein all adjacent members are connected with each other, and the inner side of the connecting plate extends into the lower part of a wing plate of the railway box girder and is connected with the lower part of the wing plate.
Expansion joints between roof trusses are arranged between the longitudinally adjacent shed tunnel sections, and asphalt wood boards are filled between the joints.
The top of the single shed tunnel comprises 3 hollow pipe pieces with 60-degree angles, the hollow pipe pieces are UHPC components, and annular through holes are formed in the inner parts of the hollow pipe pieces.
The adjacent hollow pipe pieces are connected through the pipe piece connectors on the end faces and are assembled into a 180-degree shed roof structure.
A buffer layer is laid above the shed roof structure and is a single-layer buffer layer, and single sand or single high-molecular polymer materials are adopted.
The buffer layer is laid above the shed roof structure and is a multilayer buffer layer, the bottom layer is made of high polymer, the top layer is made of sandy soil, and a hollow RC plate, hollow rubber, a steel grid, a section steel beam or a plate is clamped between the high polymer and the sandy soil to serve as a middle buffer layer.
The stand is the hollow post component of pi type UHPC, and the top is connected with hollow section of jurisdiction through section of jurisdiction stand connector, and the bottom is connected with connecting plate outside top surface through stand connecting plate connector.
The connecting plate is a UHPC component, the inner side of the connecting plate extends into the lower part of the railway box girder wing plate and is connected through a connecting plate box girder connector.
The construction method of the replaceable rockfall protection shed tunnel for the railway bridge is characterized by comprising the following steps:
the method comprises the following steps:
step 1: designing the detailed structure sizes of the hollow pipe pieces, the upright posts and the connecting plates according to the maximum impact energy required to be protected by the rockfall protection shed tunnel;
step 2: the hollow duct piece, the upright post and the connecting plate are made of ultra-high performance concrete, and the steel fiber content in the mix proportion is not less than 2 percent;
and step 3: after the hollow duct pieces, the upright posts and the connecting plates are poured in a factory, high-temperature steam curing is carried out, the steam curing temperature is 90 +/-5 ℃, and the steam curing time is not less than 72 hours;
and 4, step 4: transporting finished products of the hollow duct pieces, the upright posts and the connecting plates which are maintained in a factory to a bridge position of a railway bridge to be installed, transporting a duct piece connector, a duct piece upright post connector, an upright post connecting plate connector and a connecting plate box girder connector which are matched with the hollow duct pieces and the upright posts to the bridge position, and erecting a construction support at the top of the railway box girder;
and 5: splicing the hollow pipe sheet, the upright post and the connecting plate into 1 rockfall protection shed tunnel by a pipe sheet connector, a pipe sheet upright post connector, an upright post connecting plate connector and a connecting plate box beam connector at the top of the railway box beam;
step 6: repeating the step 5 to finish the construction of a plurality of rockfall protection shed tunnels within the rockfall protection range, and filling asphalt wood boards in the expansion joints between two roof tunnels;
and 7: laying a buffer layer on the upper part of the shed roof, and finishing the construction of the replaceable rockfall protection shed tunnel of the railway bridge;
and 8: and constructing a bridge deck auxiliary facility at the top of the railway box girder, and carrying out traffic operation.
The replacement construction comprises the following steps:
step 1: when the train bears small falling rock impact during operation, the buffer layer is recovered or replaced in time;
step 2: when a railway bridge is impacted by large rockfall under extreme natural conditions, replacing seriously damaged and difficultly recovered hollow pipe pieces in time, releasing a pipe piece connector, and detaching and then replacing the damaged hollow pipe pieces of the single shed tunnel;
and step 3: and releasing the pipe sheet upright post connector, the upright post connecting plate connector and the connecting plate box girder connector when the upright posts and the connecting plates are seriously damaged under the action of rockfall impact during the operation of the train, and detaching the damaged single shed tunnel upright posts or the connecting plates and then replacing the damaged single shed tunnel upright posts or the connecting plates.
And 4, step 4: after the replacement step 2 and the replacement step 3, the buffer layer structure is restored.
The invention has the following advantages:
(1) wide application range
The main stressed member of the shed tunnel is made of Ultra High Performance Concrete (UHPC), the structure has light dead weight and strong load bearing capacity, can be supported on a railway box girder, can avoid the influence of difficult support condition arrangement on V-shaped valley landforms in mountainous areas during actual use, and has wide application range.
(2) Construction is convenient
The main components of the invention are prefabricated in factories, and the invention has high construction efficiency, easy quality control, environmental protection and energy saving. The single member made of the ultra-high performance concrete has light weight, is flexible to implement on site and is more suitable for assembly type construction.
(3) And designing the whole life cycle.
The main stressed member of the invention is made of ultra-high performance concrete material, the durability of the main stressed member is far higher than that of common concrete and steel, and the service life of the main stressed member meets the requirement of a main structure for 100 years. Because the invention mainly protects the accidental load of falling rocks, under the extreme natural condition of large falling rocks impacting, the main components of the invention can be normally used after being locally repaired or replaced after being damaged, thereby realizing the design technology of the whole life cycle.
Drawings
Fig. 1 is a general view of a replaceable rockfall protection shed tunnel for a railway bridge.
Fig. 2 is a mounting diagram of a single component of the replaceable rockfall protection shed for the railway bridge.
FIG. 3 is a structural view of a hollow tube sheet.
FIG. 4 is a layout of a single buffer layer.
Fig. 5 is a layout of multiple buffer layers.
In the figure: 1-replaceable rockfall protection shed tunnel for railway bridges, 2-inter-expansion joint, 3-single shed tunnel, 4-hollow duct piece, 5-upright post, 6-connecting plate, 7-duct piece connector, 8-duct piece upright post connector, 9-upright post connecting plate connector, 10-connecting plate box girder connector, 11-buffer layer and 12-railway box girder.
Detailed Description
The present invention will be described in detail with reference to specific embodiments.
The invention relates to a replaceable falling-stone protective shed for a railway bridge, wherein the replaceable falling-stone protective shed for the railway bridge 1 comprises a plurality of independent shed-tunnel segments along the bridge direction, and each segment is an independent single shed-tunnel 3; the single shed tunnel 3 comprises a plurality of arc-shaped hollow pipe pieces 4 at the top, upright posts 5 with two vertical sides and connecting plates 6 below the upright posts 5, all adjacent components are connected with each other, and the inner sides of the connecting plates 6 extend into the lower part of a wing plate of the railway box girder 12 and are connected with the lower part of the wing plate. The shed tunnel is arranged on the flange plate of the railway box girder 12 through the connecting plate 6, and after combination, a bridge and shed tunnel integrated structure is formed to achieve the function of rockfall protection.
Expansion joints 2 between the roof trusses are arranged between the longitudinal adjacent shed tunnel sections, and asphalt wood boards are filled between the joints so as to achieve the sealing effect and not participate in the integral stress of the bridge.
The top of a single shed tunnel 3 comprises 3 hollow pipe pieces 4 with 60 degrees, the hollow pipe pieces are UHPC components, prefabricated hollow plates are adopted for reducing the influence on the railway box girder 12, annular through holes are arranged inside the hollow plates, and the thickness and the aperture ratio of the hollow pipe pieces are determined according to the calculation of falling rock impact energy. The adjacent hollow pipe pieces 4 are connected through the pipe piece connectors 7 on the end faces and are assembled into a shed roof structure with an angle of 180 degrees.
A buffer layer 11 is laid above the shed roof structure, is a single-layer buffer layer and is made of single sand or single high-molecular polymer material. The buffer layer 11 laid above the shed roof structure can also be a multilayer buffer layer, the bottom layer is a high polymer, the top layer is sandy soil, and a hollow RC plate, hollow rubber, a steel grid, a section steel beam or a plate is clamped between the high polymer and the sandy soil to serve as a middle buffer layer.
The upright post 5 is a Pi-shaped UHPC hollow post component, the top of the upright post is connected with the hollow duct piece 4 through a duct piece upright post connector 8, and the bottom of the upright post is connected with the top surface of the outer side of the connecting plate 6 through an upright post connecting plate connector 9.
The connecting plate 6 is a UHPC component, the inner side of which extends into the lower part of a wing plate of a railway box girder 12 and is connected by a connecting plate box girder connector 10.
The hollow pipe piece 4, the upright post 5 and the connecting plate 6 are main stress components for rockfall impact, and have the characteristics of light weight and easiness in construction besides bearing impact load. The shed tunnel can be set into multiple trusses along the bridge direction so as to meet the requirements of different rockfall protection ranges. Segment connector 7, segment stand connector 8, stand connecting plate connector 9, connecting plate case roof beam connector 10 unite into the integral structure with all components, and 4 kinds of connectors can adopt current conventional equipment, such as arc bolt, pre-buried bolt, grout sleeve, reserve schemes such as reinforcing bar connection.
The construction method of the replaceable rockfall protection shed tunnel for the railway bridge comprises the following steps:
step 1: designing the detailed structure sizes of the hollow duct piece 4, the upright post 5 and the connecting plate 6 according to the maximum impact energy required to be protected by the rockfall protection shed tunnel;
step 2: the hollow duct piece 4, the upright post 5 and the connecting plate 6 are made of ultra-high performance concrete, and the steel fiber content in the mix proportion is not less than 2 percent;
and step 3: the hollow duct piece 4, the upright post 5 and the connecting plate 6 are steamed at high temperature after being poured in a factory, the steaming temperature is 90 +/-5 ℃, and the steaming time is not less than 72 hours;
and 4, step 4: transporting finished products of the hollow duct piece 4, the upright post 5 and the connecting plate 6 which are maintained in a factory to a bridge position of a railway bridge to be installed, transporting a duct piece connector 7, a duct piece upright post connector 8, an upright post connecting plate connector 9 and a connecting plate box girder connector 10 which are matched with the hollow duct piece 4 and the upright post 5 to the bridge position, and erecting a construction support at the top of a railway box girder 12;
and 5: splicing the hollow pipe pieces 4, the upright posts 5 and the connecting plates 6 into 1 rockfall protection shed tunnel at the top of the railway box girder 12 through the pipe piece connectors 7, the pipe piece upright post connectors 8, the upright post connecting plate connectors 9 and the connecting plate box girder connectors 10;
step 6: repeating the step 5 to finish the construction of a plurality of rockfall protection shed tunnels within the rockfall protection range, and filling asphalt wood boards in the expansion joints 2 between two roof tunnels;
and 7: laying a buffer layer 11 on the upper part of the shed roof, and finishing the construction of the replaceable rockfall protection shed tunnel of the railway bridge;
and 8: and constructing bridge deck auxiliary facilities on the top of the railway box girder 12, and carrying out traffic operation.
The replacement construction comprises the following steps:
step 1: the impact of less rockfall is mainly born during the train operation, and main part atress component does not need to be changed at elasticity stage work, nevertheless buffer layer 11 strikes and should in time resume or change when warping thickness exceeds half, leads to the operation after the acceptance check is qualified.
Step 2: when a railway bridge is impacted by large rockfall under extreme natural conditions, the hollow pipe piece 4 works according to the plastic stage design under the action of rockfall impact, generally serious damage is serious and difficult to recover, the pipe piece connector 7 is released, the damaged single-frame shed hollow pipe piece is disassembled, the construction steps 2-8 are repeated until the damaged shed hollow pipe piece is completely replaced, and the railway bridge is put into operation after acceptance inspection is qualified.
And step 3: when the stand columns 5 and the connecting plates 6 are seriously damaged under the action of rockfall impact during the operation of the train, the segment stand column connectors 8, the stand column connecting plate connectors 9 and the connecting plate box girder connectors 10 can be released, the damaged single shed tunnel stand columns or the damaged connecting plates are disassembled according to the replacing step 2, namely the replacing mode of the hollow segment, the construction steps 2-8 are repeated until the stand columns and the connecting plates damaging the shed tunnels are completely replaced, and the train is passed through for operation after acceptance inspection is qualified.
And 4, step 4: after the replacement step 2 and the replacement step 3, the buffer layer structure is restored with reference to the replacement step 1.
The shed tunnel has the function of guaranteeing the safe operation of the lower railway under the impact of falling rocks, and simultaneously has the characteristics of small structural size and high impact load protection capacity because the main components of the shed tunnel are all made of ultra-high-performance concrete materials. When bearing the impact of small falling rocks in the use, can be intact as before in time to the buffer layer recovery. When the impact of extremely large falling rocks is borne in the use process, main stress components such as hollow pipe pieces and stand columns are greatly damaged under the impact of the falling rocks, and the main structure under the extreme disaster condition can be easily maintained by replacing a single stress component. The method can be popularized and applied to the protection of the dangerous rock falling rocks of the bridge of the mountain railway.
The invention is not limited to the examples, and any equivalent changes to the technical solution of the invention by a person skilled in the art after reading the description of the invention are covered by the claims of the invention.
Claims (10)
1. Removable formula of railway bridge stone protection shed tunnel that falls, its characterized in that:
the replaceable rockfall protection shed tunnel (1) for the railway bridge comprises a plurality of independent shed tunnel sections along the bridge direction, and each section is an independent single shed tunnel (3);
the single shed tunnel (3) comprises a plurality of arc-shaped hollow pipe pieces (4) at the top, upright posts (5) with two vertical sides and a connecting plate (6) below the upright posts (5), all adjacent components are connected with each other, and the inner side of the connecting plate (6) extends into the lower part of a wing plate of the railway box girder (12) and is connected with the lower part of the wing plate.
2. The replaceable rockfall protection shed tunnel for railroad bridges according to claim 1, wherein:
expansion joints (2) between the trusses are arranged between the longitudinally adjacent shed tunnel sections, and asphalt wood boards are filled between the joints.
3. The replaceable rockfall protection shed tunnel for railroad bridges according to claim 2, wherein:
the top of the single shed tunnel (3) comprises 3 hollow pipe pieces (4) with 60-degree angles, and the hollow pipe pieces are UHPC components and are internally provided with annular through holes.
4. The replaceable rockfall protection shed tunnel for railroad bridges according to claim 3, wherein:
the adjacent hollow pipe pieces (4) are connected through pipe piece connectors (7) on the end faces and are assembled into a shed top structure with an angle of 180 degrees.
5. The replaceable rockfall protection shed tunnel for railway bridges according to claim 4, wherein:
a buffer layer (11) is laid above the shed roof structure and is a single-layer buffer layer, and single sand or single high-molecular polymer material is adopted.
6. The replaceable rockfall protection shed tunnel for railway bridges according to claim 4, wherein:
a buffer layer (11) is laid above the shed roof structure and is a multilayer buffer layer, the bottom layer is made of high polymer, the top layer is made of sandy soil, and a hollow RC plate, hollow rubber, a steel grid, a section steel beam or a plate is clamped between the high polymer and the sandy soil to serve as a middle buffer layer.
7. The replaceable rockfall protection shed tunnel for railroad bridges according to claim 5 or 6, wherein:
the upright column (5) is a Pi-shaped UHPC hollow column component, the top of the upright column component is connected with the hollow pipe piece (4) through a pipe piece upright column connector (8), and the bottom of the upright column component is connected with the top surface of the outer side of the connecting plate (6) through an upright column connecting plate connector (9).
8. The replaceable rockfall protection shed tunnel for railroad bridges according to claim 7, wherein:
the connecting plate (6) is a UHPC component, the inner side of the connecting plate extends into the lower part of a wing plate of the railway box girder (12) and is connected through a connecting plate box girder connector (10).
9. The construction method of the replaceable rockfall protection shed tunnel for the railway bridge is characterized by comprising the following steps:
the method comprises the following steps:
step 1: according to the maximum impact energy required to be protected by the rockfall protection shed tunnel, the detailed structure sizes of the hollow pipe piece (4), the upright post (5) and the connecting plate (6) are designed;
step 2: the hollow duct piece (4), the upright post (5) and the connecting plate (6) are made of ultra-high performance concrete, and the steel fiber content in the mixing ratio is not less than 2 percent;
and step 3: the hollow pipe piece (4), the upright post (5) and the connecting plate (6) are steamed at high temperature after being poured in a factory, the steaming temperature is 90 +/-5 ℃, and the steaming time is not less than 72 hours;
and 4, step 4: transporting finished products of the hollow duct piece (4), the upright post (5) and the connecting plate (6) which are maintained in a factory to a bridge position of a railway bridge to be installed, transporting a duct piece connector (7), a duct piece upright post connector (8), an upright post connecting plate connector (9) and a connecting plate box girder connector (10) which are matched with the hollow duct piece (4) and the upright post (5) to the bridge position, and erecting a construction support at the top of the railway box girder (12);
and 5: the top of a railway box girder (12) is spliced into 1 rockfall protection shed tunnel by a duct piece connector (7), a duct piece upright post connector (8), an upright post connecting plate connector (9) and a connecting plate box girder connector (10) through a hollow duct piece (4), an upright post (5) and a connecting plate (6);
step 6: repeating the step 5 to finish the construction of a plurality of rockfall protection shed tunnels within the rockfall protection range, and filling asphalt wood boards in the inter-roof expansion joints (2) between the two shed tunnels;
and 7: laying a buffer layer (11) on the upper part of the shed roof, and finishing the construction of the replaceable rockfall protection shed tunnel of the railway bridge;
and 8: and (3) constructing bridge deck auxiliary facilities at the top of the railway box girder (12) and carrying out traffic operation.
10. The construction method of the replaceable rockfall protection shed tunnel for railway bridges according to claim 9, wherein:
the replacement construction comprises the following steps:
step 1: when the train bears small falling rock impact in the operation period, the buffer layer (11) is recovered or replaced in time;
step 2: when a railway bridge is impacted by large rockfall under extreme natural conditions, the damaged hollow duct pieces (4) which are seriously damaged and difficult to recover are replaced in time, the duct piece connectors (7) are released, and the damaged hollow duct pieces of the single-frame shed tunnel are detached and then replaced;
and step 3: when the upright post (5) and the connecting plate (6) are seriously damaged under the action of rockfall impact during the operation of the train, releasing a tube sheet upright post connector (8), an upright post connecting plate connector (9) and a connecting plate box girder connector (10), and detaching and then replacing the damaged single shed upright post or connecting plate;
and 4, step 4: after the replacing step 2 and the replacing step 3, the buffer layer (11) structure is recovered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010124999.6A CN111270620A (en) | 2020-02-27 | 2020-02-27 | Replaceable rockfall protection shed tunnel for railway bridge and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010124999.6A CN111270620A (en) | 2020-02-27 | 2020-02-27 | Replaceable rockfall protection shed tunnel for railway bridge and construction method thereof |
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| CN111270620A true CN111270620A (en) | 2020-06-12 |
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