CN113293665A - Roadbed reinforcing method for long side of railway bridge and culvert connection - Google Patents
Roadbed reinforcing method for long side of railway bridge and culvert connection Download PDFInfo
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- CN113293665A CN113293665A CN202110615361.7A CN202110615361A CN113293665A CN 113293665 A CN113293665 A CN 113293665A CN 202110615361 A CN202110615361 A CN 202110615361A CN 113293665 A CN113293665 A CN 113293665A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2/00—General structure of permanent way
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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Abstract
The invention discloses a method for reinforcing a roadbed at the long side of a railway bridge and culvert, which is a vertical excavation supporting system formed by a horizontal steel pipe curtain and a supporting wall (a protective pile) by taking an existing splayed wing wall and an existing railway roadbed as supporting points. The system is composed of existing splayed wing walls, horizontal steel pipe curtains, supporting retaining walls (protective piles) and the like. In the implementation process of the method provided by the invention, the purposes of no protection of railway tracks, no cutting of seamless lines and key protection at two ends of a long bridge and culvert construction site can be realized, and meanwhile, the roadbed on the long side of the existing bridge and culvert construction site can be effectively protected and reinforced, the supporting effect is better, the used materials are less, the mechanization degree is high, the construction risk is low, the cost is saved, and the floor occupation range of the second-line railway can be reduced to the maximum extent.
Description
Technical Field
The invention belongs to the technical field of existing roadbed reinforcing support design and construction, and particularly relates to a method for reinforcing a roadbed on the long side of a bridge and a culvert of a railway.
Background
The railway is used as the backbone of a comprehensive transportation system, is an important foundation for supporting the national economic development and is also an important condition for dealing with emergencies and guaranteeing emergency materials and personnel transportation. In recent years, with the continuous improvement of national economic level of China, the railway transportation industry obtains unprecedented development opportunities, main railway trunks are continuously completed at present, and the modern railway network taking national economic foundation as support and high-speed rail construction as guidance gradually tends to be perfect and complete.
Under the opportunity that the modern comprehensive transportation system and medium and long-term railway network planning are developed for a long time, along with the increasing of the regional economic development demand and the increasing of the circulation of freight goods and materials among different regions, the bad phenomena of saturated or nearly saturated transportation energy and the like of partial existing railways are caused. The phenomenon not only causes the limited circulation capacity of freight goods and materials and the blocked regional economic intercommunication, but also provides new challenges for the normal operation of the existing railway and the service life of the existing railway when the railway operates in overload.
In order to effectively alleviate the above-mentioned embarrassment faced by the existing railway, it is one of effective solutions to add a second line near the existing railway. When a second line is built, in order to effectively control the construction investment of the second line and save the occupied area range of railway land, the line distance (the distance between the central lines of the lines) between the second line and the existing railway is usually controlled to be 5-12 m. When the distance between two adjacent lines is large, the construction of the newly added two lines will not cause great influence on the normal operation of the existing railway. However, when the distance between two lines is small, the new two lines need to be constructed in the range of the existing railway subgrade, and the construction of the new two lines will affect the existing railway operation and the existing bridge and culvert work points such as box bridges, culverts and the like along the line to different degrees, and if necessary, even in the range of the existing railway subgrade, the existing bridge and culvert work points need to be lengthened.
Generally, except for bridge and culvert sites of high fill sections, the half width (half width of bridge and culvert structures with a line central line as an axis) of bridge and culvert structures such as existing box bridges and culverts of most normal fill sections is only 2.5m to 3.0m, wherein splayed wing walls are embedded into an existing railway roadbed for more than 1.5m, and when newly-added second-line construction needs to extend the existing bridge and culvert sites, the structures such as splayed wing walls on the long side connected with the existing bridge and culvert sites need to be removed, and protection and reinforcement are carried out on the existing lines and the roadbed near the sites.
At present, the commonly used existing railway line protection and roadbed reinforcement schemes comprise the line protection of erecting steel temporary beams, the roadbed reinforcement of pile slab continuous walls and the like.
The steel beam protection circuit scheme is as follows: the existing box-shaped bridge roof and side walls are used as fulcrums, a group of D-shaped steel temporary beams are erected on two sides of the existing box-shaped bridge roof and side walls respectively to protect an existing railway line, and after the existing splayed wing walls on the long sides of the existing box-shaped bridge are connected with the existing box-shaped bridge roof and the side walls through dismantling (or chiseling by a rope saw), the existing box-shaped bridge is constructed.
The scheme of reinforcing the roadbed by the pile plate continuous wall is as follows: erecting 3-5-3 buckling and hanging rail beam protection on a railway line in a protection pile construction area within a railway shoulder, reinforcing a railway roadbed behind the existing splayed wing wall by adopting a hole digging pile (protection pile) and cast-in-place reinforced concrete slab (hereinafter referred to as 'pile slab continuous wall') supporting and retaining structure, and constructing a second-line bridge after removing an overlapping area of the existing splayed wing wall on the long side of the second-line bridge and the profile of the long bridge by using a rope saw.
The common reinforcement protection scheme practically solves some practical engineering problems in the application process, and also obtains a certain protection effect. The following disadvantages still remain:
1. the steel beam has the following defects in the line protection:
(1) before the existing railway line is erected with the steel temporary beam, the existing railway line needs to be subjected to seamless line cutting and stress relieving treatment, the 3-5-3 buckling and hanging rail beams are erected at the existing line at the fulcrum pile of the steel temporary beam, the seamless line is restored after completion, and the construction process is complicated.
(2) During the erection of the steel temporary beam or the suspension rail beam, the existing railway line needs to limit speed and slowly move, so that the transport capacity which is originally saturated or close to saturation is further aggravated, and most of the existing railways basically do not have long-time and frequent speed-limiting construction conditions according to the transportation organization requirements of the existing railway.
(3) In the process of building a line II, the existing box-shaped bridge along the line has more long work points, and the number of steel beam devices is limited, so that the requirement of large-scale construction cannot be met.
2. The pile plate continuous wall has the following defects in roadbed reinforcement:
(1) before constructing the hole digging piles in the road shoulder range, the existing railway line needs to cut the seamless line and erect 3-5-3 buckling hanging rail beams, and the seamless line is recovered after the hanging rail beams are dismantled, so that the construction process is complicated.
(2) Because of the restriction of construction space, form "no protection triangle region" more than 2m between fender pile and the existing box bridge tip (the key protection reinforcing region), the road bed reinforcing effect is general, has certain potential safety hazard.
(3) The pile-plate continuous wall is formed by combining a plurality of manual hole digging piles and cast-in-place reinforced concrete wallboards among the hole digging piles. The manual hole digging piles are basically close to the existing railway road shoulders, are large in quantity and deep in embedment, the wall protecting walls between the hole digging piles are dug while pouring, the secondary protection construction difficulty is large, the whole construction process is basically completed manually, the construction efficiency is low, and the construction period is long.
In view of the above reasons, in order to avoid unnecessary influence on normal operation and safety of the existing railway caused by the box bridge construction site in the lengthening process, a practical protection and reinforcement measure is urgently needed to effectively reinforce and protect the existing railway line and the roadbed slope.
Disclosure of Invention
The invention aims to provide a method for reinforcing a roadbed at the long side of a railway bridge and culvert, which can effectively protect and reinforce the roadbed at the long side of the existing bridge and culvert, has better supporting effect, less material consumption, high mechanization degree, low construction risk and cost saving, and can reduce the floor area of a second-line railway to the maximum extent.
In order to achieve the above purpose, the technical solution adopted by the invention is as follows: a method for reinforcing a roadbed on the long side of a railway bridge or culvert is implemented according to the following steps: the method comprises the following steps: verifying the effective height of a reserved part after the wire saw cuts the existing splayed wing wall, calculating the vertical excavation height of the existing roadbed, installing a guide frame in the height range below the box-shaped bridge and culvert top plate, and setting up a drilling machine operation platform; step two: constructing a road shoulder retaining wall at the position, which is 2.4m away from the center of a railway line, of two ends of the existing box-shaped bridge on one side of the lengthened box-shaped bridge: heighth 1The width of the foundation pit is 0.8m, the length of the foundation pit is 2m, and the side, close to the line, of the foundation pit is vertically excavated and supported by a steel template so as to ensure the stability of the track; step three: in the height range below the top plate of the box-shaped bridge culvert, the existing splayed wing wall is used as a guide wall, a horizontal drilling machine is adopted to drill a construction process along with a pipe, a curtain steel pipe is arranged from bottom to top along the direction of a railway line, the near end of the curtain steel pipe is temporarily supported by the existing splayed wing wall, and the far end of the curtain steel pipe is anchored in a stable slope line of a roadbed soil body and is controlled to be not less than 1.5 m; step four: after all curtain steel pipes are arranged in place according to the designed positions and the lengths, M30 cement slurry is injected through grouting holes reserved in the surfaces of the curtain steel pipes, soil bodies around the steel pipes are solidified and reinforced, steel reinforcement cages are arranged in the curtain steel pipes, and the steel pipes are filled with the M30 cement slurry, so that the strength of the curtain steel pipes is enhanced, the steel pipe curtain is formed, isolation and reinforcement are formed on a railway roadbed, protection is provided for a retaining wall, and the stability of an existing track is guaranteed; step five: outside the existing splayed wing wall cutting lineThe method comprises the following steps of pouring a reinforced concrete support wall in a height range, completing the substitution of a tube curtain near-end support point and a retaining wall before the cutting part of the existing splayed wing wall is removed, installing steel plates or hanging reinforcing meshes and spraying cement and curing treatment on the outer side of the tube curtain in the height range below a box-shaped bridge culvert top plate while excavating, reducing the disturbance to a railway roadbed and the tube curtain, determining the excavation depth according to the situation of on-site soil quality, and vertically supporting and excavating the outer side of a foundation pit of a retaining wall by adopting a bridge steel template; step six: according to the construction point design drawing, the existing splayed wing wall is cut and chiseled by a rope saw, and a construction operation space is reserved for lengthening the bridge and the culvert.
The invention comprises the following steps: (1) the method for reinforcing the roadbed steel pipe curtain can reduce the construction investment of a newly added second line to the maximum extent on the premise of ensuring that the normal operation of the existing line is not influenced by construction. (2) In the process of lengthening the existing bridges and culverts, measures and steps such as cutting, stress releasing and the like are not needed to be taken for the seamless lines of the existing railway, and the redundancy of the construction link is reduced to the maximum extent. (3) The vertical excavation supporting system formed by the existing splayed wing walls, the horizontal steel pipe curtain, the supporting retaining walls (the protective piles) and the like does not need to take extra protective measures for existing lines, the purpose of reinforcing the existing roadbed can be achieved, and a great deal of adverse effects of bridge and culvert work point lengthening construction on the safety and stability of the existing roadbed are effectively improved. (4) In addition, the invention has the advantages of high mechanized operation degree, low construction risk, excellent protection effect of the existing structure, good safety, high efficiency, short construction period and the like.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a side view of the present invention;
FIG. 4 is a perspective view of the steel tube of the curtain of the present invention.
In the figure: 1. a bridge and a culvert; 2. concrete shoulder retaining walls; 3. a concrete support wall; 4. a steel template soil retaining plate; 5. a pipe curtain; 6. the existing splayed wing wall is provided; 7. newly building a splayed wing wall; 8. existing railway beds; 9. a guide frame; 10. curtain steel pipes; 11. grouting holes; 12. and (4) a reinforcement cage.
Detailed Description
The invention is further described in detail below with reference to the following figures and examples:
a method for reinforcing a roadbed on the long side of a railway bridge or culvert is implemented according to the following steps: the method comprises the following steps: verifying the effective height of a reserved part after the wire saw cuts the existing splayed wing wall, calculating the vertical excavation height of the existing roadbed, installing a guide frame in the height range below the box-shaped bridge and culvert top plate, and setting up a drilling machine operation platform; step two: constructing a road shoulder retaining wall at the position, which is 2.4m away from the center of a railway line, of two ends of the existing box-shaped bridge on one side of the lengthened box-shaped bridge: heighth 1The width of the foundation pit is 0.8m, the length of the foundation pit is 2m, and the side, close to the line, of the foundation pit is vertically excavated and supported by a steel template so as to ensure the stability of the track; step three: in the height range below the top plate of the box-shaped bridge culvert, the existing splayed wing wall is used as a guide wall, a horizontal drilling machine is adopted to drill a construction process along with a pipe, a curtain steel pipe is arranged from bottom to top along the direction of a railway line, the near end of the curtain steel pipe is temporarily supported by the existing splayed wing wall, and the far end of the curtain steel pipe is anchored in a stable slope line of a roadbed soil body and is controlled to be not less than 1.5 m; step four: after all curtain steel pipes are arranged in place according to the designed positions and the lengths, M30 cement slurry is injected through grouting holes reserved in the surfaces of the curtain steel pipes, soil bodies around the steel pipes are solidified and reinforced, steel reinforcement cages are arranged in the curtain steel pipes, and the steel pipes are filled with the M30 cement slurry, so that the strength of the curtain steel pipes is enhanced, the steel pipe curtain is formed, isolation and reinforcement are formed on a railway roadbed, protection is provided for a retaining wall, and the stability of an existing track is guaranteed; step five: the method comprises the steps of pouring a reinforced concrete support wall in situ in a height range outside a cutting line of the existing splayed wing wall, completing the substitution of a tube curtain near-end supporting point and a retaining wall before the cutting part of the existing splayed wing wall is removed, installing a steel plate or hanging a reinforcing mesh outside the tube curtain in the height range below a box-shaped bridge culvert top plate while excavating, carrying out slurry spraying and curing treatment, reducing disturbance on a railway roadbed and the tube curtain, determining the excavation depth according to the condition of soil on site, and vertically supporting and excavating the outer side of a foundation pit of the retaining wall by adopting a bridge steel template; step six: according to the working point design drawing, the existing splayed wing wall is cut and chiseled by a wire saw and is lengthenedAnd construction operation space is reserved for the bridges and the culverts.
Example (b): as shown in fig. 1, 2, 3 and 4, a newly-built splayed wing wall 7 is built at the outer side part of an existing splayed wing wall 6, a concrete shoulder retaining wall 2 and a concrete supporting wall 3 are arranged in an existing railway roadbed 8 at the rear of one side of a bridge and culvert, the concrete supporting wall 3 and the existing splayed wing wall 6 are tightly attached together, a steel template retaining plate 4 is arranged on the back surface of the concrete supporting wall 3, the concrete shoulder retaining wall 2 is horizontally arranged and is vertical to the concrete supporting wall 3, a guide frame 9 is vertically and fixedly arranged at the joint of the bridge and culvert 1 and the existing splayed wing wall 6, a plurality of curtain steel pipes 10 are sequentially and horizontally arranged in the guide frame 9 from top to bottom at intervals, the lengths of the curtain steel pipes 10 are sequentially increased from bottom to top, and the other ends of the curtain steel pipes 10 penetrate through the existing splayed wing wall 6, the concrete supporting wall 3 and the existing splayed wing wall 6, The steel template soil retaining plate 4 is anchored in the existing railway roadbed 8, a plurality of grouting holes 11 are distributed on a tube body of a curtain steel tube 10, a steel reinforcement cage 12 is respectively arranged in the curtain steel tube 10, and M30 cement mortar is filled in the curtain steel tube.
Referring to fig. 1, the embodiment forms a vertical excavation supporting system by horizontal curtain steel pipes 10 and concrete supporting walls 3 with existing splayed wing walls 6 and existing railway foundations 8 as supporting points. The system is composed of an existing splayed wing wall 6, a horizontal curtain steel pipe 10, a concrete support wall 3 and the like.
Referring to fig. 1 and 2, a guide frame 9 is installed in the range below a box bridge (culvert) roof, and a drilling machine operation platform is built. The concrete shoulder retaining wall 2 is constructed at one side of the lengthened box-shaped bridge (culvert) beyond the distance from two ends of the existing box-shaped bridge (culvert) to the center of the railway line, and the steel template retaining plate 4 is adopted at one side close to the railway line for vertical excavation supporting so as to ensure the stability of the track.
Referring to fig. 1 and 2, an existing splayed wing wall 6 is used as a guide wall, and a horizontal curtain steel pipe 10 is arranged from bottom to top along the direction of a railway line by using a horizontal drilling machine. At this time, the near end of the horizontal curtain steel tube 10 is temporarily supported by the existing splayed wing wall 6, and the far end of the horizontal curtain steel tube 10 is anchored within the filler stabilization slope line of the existing railway roadbed 8.
Referring to fig. 4, after all the horizontal curtain steel pipes 10 are arranged in place according to the designed positions and lengths, the steel reinforcement cage 12 is placed inside the horizontal curtain steel pipes 10, grouting holes 11 are distributed on the surfaces of the horizontal curtain steel pipes 10, injected M30 cement mortar is expanded into roadbed filling materials around the horizontal curtain steel pipes 10 through the grouting holes 11, the strength of the pipe curtain 5 is enhanced, and the effect of curing the roadbed filling materials around is achieved.
Referring to fig. 3, the reinforced concrete support wall 3 is cast in situ within the range of the height H outside the cutting line of the existing splayed wing wall 6, the replacement of the tube curtain proximal end supporting point and the retaining wall is completed before the cut part of the existing splayed wing wall 6 is removed, and the outer side of the reinforced concrete support wall 3 is vertically excavated and supported by using the steel formwork retaining plate 4.
Claims (1)
1. A method for reinforcing a roadbed at the long side of a railway bridge or culvert is characterized by comprising the following steps: the method comprises the following steps: verifying the effective height of a reserved part after the wire saw cuts the existing splayed wing wall, calculating the vertical excavation height of the existing roadbed, installing a guide frame in the height range below the box-shaped bridge and culvert top plate, and setting up a drilling machine operation platform; step two: constructing a road shoulder retaining wall at the position, which is 2.4m away from the center of a railway line, of two ends of the existing box-shaped bridge on one side of the lengthened box-shaped bridge: the height is equal to the distance from the road shoulder to the bottom of the bridge and culvert top plate, the width is 0.8m, and the length is 2m, and one side of the foundation pit close to the line is vertically excavated and supported by a steel template so as to ensure the stability of the track; step three: in the height range below the top plate of the box-shaped bridge culvert, the existing splayed wing wall is used as a guide wall, a horizontal drilling machine is adopted to drill a construction process along with a pipe, a curtain steel pipe is arranged from bottom to top along the direction of a railway line, the near end of the curtain steel pipe is temporarily supported by the existing splayed wing wall, and the far end of the curtain steel pipe is anchored in a stable slope line of a roadbed soil body and is controlled to be not less than 1.5 m; step four: after all curtain steel pipes are arranged in place according to the designed positions and the lengths, M30 cement slurry is injected through grouting holes reserved in the surfaces of the curtain steel pipes, soil bodies around the steel pipes are solidified and reinforced, steel reinforcement cages are arranged in the curtain steel pipes, and the steel pipes are filled with the M30 cement slurry, so that the strength of the curtain steel pipes is enhanced, the steel pipe curtain is formed, isolation and reinforcement are formed on a railway roadbed, protection is provided for a retaining wall, and the stability of an existing track is guaranteed; step five: the method comprises the steps of pouring a reinforced concrete support wall in situ in a height range outside a cutting line of the existing splayed wing wall, completing the substitution of a tube curtain near-end supporting point and a retaining wall before the cutting part of the existing splayed wing wall is removed, installing a steel plate or hanging a reinforcing mesh outside the tube curtain in the height range below a box-shaped bridge culvert top plate while excavating, carrying out slurry spraying and curing treatment, reducing disturbance on a railway roadbed and the tube curtain, determining the excavation depth according to the condition of soil on site, and vertically supporting and excavating the outer side of a foundation pit of the retaining wall by adopting a bridge steel template; step six: according to the construction point design drawing, the existing splayed wing wall is cut and chiseled by a rope saw, and a construction operation space is reserved for lengthening the bridge and the culvert.
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| CN202110615361.7A CN113293665B (en) | 2021-06-02 | 2021-06-02 | Roadbed reinforcing method for long side of railway bridge and culvert connection |
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| 周浩: "道路下穿既有铁路工程施工的关键技术", 《中国高新科技》 * |
| 谢东: "《岩土工程设计与工程安全》", 31 May 2019 * |
| 铁路工程（桥涵）施工作业操作手册: "《铁路工程（桥涵）施工作业操作手册》", 31 December 2014 * |
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