CN112112049A - Construction method for replacing existing railway roadbed with railway simply-supported T-beam bridge - Google Patents
Construction method for replacing existing railway roadbed with railway simply-supported T-beam bridge Download PDFInfo
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- CN112112049A CN112112049A CN202011110712.0A CN202011110712A CN112112049A CN 112112049 A CN112112049 A CN 112112049A CN 202011110712 A CN202011110712 A CN 202011110712A CN 112112049 A CN112112049 A CN 112112049A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D1/00—Bridges in general
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention relates to a construction method for replacing an existing railway roadbed with a railway simply supported T-beam bridge, which comprises the following specific steps: firstly, adopting a hole digging pile to support a D-shaped temporary bridge to erect an existing line, and constructing a portal frame pier in a damaged roadbed; secondly, the line is converted to be overhead, the constructed portal frame pier is used for supporting the D-shaped stool beam to be erected to form an existing line, and a simply supported T beam is assembled on one side of the line; sliding the temporary beam of the overhead line together with the line track to the outside of the opposite side limit of the line; and finally, sliding the simply supported T-shaped beam to a portal frame pier in the skylight point through a beam moving trolley and a beam moving slideway, installing a support, and changing the existing railway roadbed into a railway bridge. The invention has simple structure design and construction method, does not interrupt the operation of the existing railway in the construction process, and the bridge with the modified roadbed and the bridge has good strength, rigidity and stability, can thoroughly radically treat roadbed diseases, not only meets the requirement of the existing railway operation during the construction, but also reduces the interference of the construction on the railway operation.
Description
Technical Field
The invention relates to the technical field of railway bridge and roadbed engineering construction, in particular to a construction method for replacing an existing railway roadbed with a railway simply-supported T-beam bridge.
Background
It is very important that the railway bed is stable. In the railway constructed in mountain areas and rivers, the subgrade filled in the half-slope section with a steep cross slope is easy to form subgrade slippage diseases due to the effects of rainwater flood erosion, river water erosion and the like, so that the subgrade is unstable; the method contributes green clean energy to the society, develops water resources, and builds a large pair of reservoirs and generates electricity on rivers. After the reservoir is built and stored, the water surface is raised, so that the dynamic water pressure action formed by repeatedly storing and discharging water after most of railway reservoirs built along rivers are built and the reservoir water is soaked for a long time, so that the railway roadbed filler particles are loosened and separated, finally, the roadbed collapses and is unstable, diseases occur sometimes, harm is caused, and the railway operation safety is influenced. The railway subgrade is difficult to repair after the damage of the railway subgrade occurs, and even if the railway subgrade is repaired, the stability of the subgrade is also very poor, so that the normal operation safety of the railway is difficult to ensure.
Disclosure of Invention
The invention aims to provide a construction method for replacing an existing railway roadbed with a railway simply supported T-beam bridge, which can thoroughly and radically cure the defects of the existing filling railway roadbed by using a road-to-bridge method while maintaining railway operation, solve the problem that the roadbed can not be thoroughly repaired due to the existing railway roadbed genetic defects, reduce the influence of construction on the existing railway transportation, and be simple, safe and reliable.
The technical scheme adopted by the invention is as follows:
the construction method for replacing the existing railway roadbed with the railway simply supported T-beam bridge is characterized by comprising the following steps of:
the method comprises the steps of after an existing railway line is built on the ground, replacing the existing railway roadbed with a railway simply-supported T-beam bridge through newly constructing a pier support in the damaged roadbed.
The method specifically comprises the following steps:
constructing a hole digging pile, supporting a D-shaped temporary beam by the hole digging pile, and hollowing an existing railway line by the beam;
step two, constructing a portal frame pier in the damaged roadbed, and assembling a simple T-shaped beam on a bent frame at one side of the line;
step three, after the step two is completed, adjusting the overhead position of the line, supporting a D-shaped temporary girder by using a constructed portal frame pier, erecting the existing railway line by using the girder, wherein the length of the overhead line is exactly the same as that of the bridge to be replaced, and the bridge is convenient to slide in place in the hole alignment;
step four, in the skylight point, integrally pushing the line overhead equipment to a line boundary limiting outer platform;
and step five, after the step four is completed, moving the simply supported T-shaped beam to the pier of the portal frame by using the beam moving trolley through the beam moving slide way, installing a support, and changing the existing railway roadbed into the railway bridge.
In the second step, the portal frame pier comprises a frame pier column, a frame pier cross beam and a frame pier top cap;
firstly, two pier columns for erecting a pier are constructed, then a frame pier cross beam is constructed on the tops of the two transversely corresponding frame pier column tops, and finally a frame pier top cap is arranged on the top of the frame pier cross beam.
And fifthly, sliding the simply supported T-shaped beam assembled on one side of the line to the lower part of the line along the direction perpendicular to the line along the beam moving slide way, and installing the simply supported T-shaped beam on the portal frame pier to finish the structural replacement and construction of the roadbed-to-bridge.
The invention has the following advantages:
the invention has simple structure design and construction method, does not interrupt the operation of the existing railway in the construction process, has good strength, rigidity and stability after the completion of the roadbed bridge change, can radically treat the roadbed diseases, not only meets the requirement of the existing railway operation during the construction, but also is convenient for construction and reduces the interference to the railway operation.
Drawings
Fig. 1 is a schematic diagram of an original roadbed state.
Fig. 2 is a schematic diagram of construction of a hole digging pile supporting overhead line and a pier.
Fig. 3 is a schematic view of a pier-supporting overhead line.
Fig. 4 is a schematic view of a horizontal bogie beam.
Fig. 5 is a schematic diagram of a state of being rebuilt into a bridge.
Fig. 6 is a schematic elevation view of a process for adjusting the overhead position of a line.
Fig. 7 is a schematic plan view of a process of adjusting the overhead position of the line.
In the figure, 1-existing line steel rails, 2-D-shaped temporary beams, 3-existing line sleepers, 4-frame pier top caps, 5-frame pier cross beams, 6-frame pier columns, 7-beam moving slideways, 8-beam moving trolleys, 9-simply supported T beams, 10-roadbed structures, 11-track bed boards, 12-bored piles and 13-sleeper piles are arranged.
Detailed Description
The present invention will be described in detail with reference to specific embodiments.
The invention relates to a construction method for replacing an existing railway roadbed with a railway simply supported T-beam bridge. The method specifically comprises the following steps:
step one, constructing a hole digging pile 12, and supporting a D-shaped temporary beam 2 by the hole digging pile 12, wherein the beam is empty of an existing railway line;
step two, constructing a portal frame pier in the damaged roadbed, and assembling a simple T-shaped beam 9 on a bent frame at one side of the line;
step three, after the step two is completed, adjusting the overhead position of the line, supporting the D-shaped temporary beam 2 by using the constructed pier of the portal frame, erecting the existing railway line by the beam, and enabling the length of the overhead line to be exactly the same as that of the bridge to be replaced so as to facilitate the sliding of the bridge in place of the hole alignment;
step four, in the skylight point, integrally pushing the line overhead equipment to a line boundary limiting outer platform;
and step five, after the step four is completed, the simply supported T-shaped beam 9 is moved to the pier of the portal frame by the beam moving trolley 8 through the beam moving slide rail 7, a support is installed, and the existing railway roadbed is changed into a railway bridge.
In the second step, the portal frame pier comprises a frame pier column 6, a frame pier cross beam 5 and a frame pier top cap 4; firstly, two pier columns 6 of the frame pier are constructed, then frame pier cross beams 5 are constructed on the tops of the two transversely corresponding frame pier columns 6, and finally frame pier top caps 4 are arranged on the tops of the frame pier cross beams 5.
And fifthly, sliding the simply supported T-shaped beam 9 assembled on one side of the line to the lower part of the line along the direction perpendicular to the line direction of the beam moving slide way 7, and installing the simply supported T-shaped beam on a portal frame pier to finish the structure replacement and construction of the roadbed bridge reconstruction.
In the process, stress dispersion needs to be carried out on the seamless line in front of the overhead railway line. The ultrahigh LKJ data of the railway line needs to be adjusted according to the driving speed required by construction before the overhead line and after the bridge is changed. The simple support T-beam 9 is constructed by laying track panels (containing ballast and sleepers).
The construction structure for rebuilding the railway subgrade into the bridge related to the method comprises the existing railway line, a D-shaped temporary beam 2, a bored pile 12, a portal frame pier and a simply supported T-shaped beam 9; the D-shaped temporary beam 2 is used for overhead existing railway lines, and the D-shaped temporary beam 2 is supported by the dug pile 12; after the portal frame pier is constructed in the existing railway roadbed, the portal frame pier supports the D-shaped temporary beam 2 to make the existing railway line overhead, and the simple T-shaped beam 9 is used for replacing the existing railway roadbed to form the railway simple T-shaped beam bridge.
The portal frame pier comprises a frame pier column 6, a frame pier cross beam 5 and a frame pier top cap 4; the frame pier cross beam 5 is positioned between the tops of the two frame pier columns 6, and the frame pier top cap 4 is positioned on the top of the frame pier cross beam 5.
The construction structure further comprises a beam moving slideway 7 vertical to the line, the beam moving slideway 7 extends to the lower part of the overhead original line from one side of the line, and the simply-supported T-shaped beam 9 is assembled on a bent frame on one side of the line and then slides to the lower part of the existing line through the beam moving slideway 7 by utilizing a beam moving trolley 8.
The invention reconstructs the existing railway roadbed into the railway bridge, can thoroughly and radically cure railway roadbed diseases on the premise of not influencing the normal operation of the railway, and ensures the safe operation of the railway. The novel railway roadbed bridge-changing design is to replace the existing roadbed which is about to be damaged or is seriously damaged with a railway simply supported beam bridge. Firstly, a bridge pier foundation (which can be an enlarged foundation or a pile foundation and is determined according to geological conditions) is arranged in a damaged railway roadbed, piers are arranged on the foundation, a top cap is arranged at the top of the pier, and then a prefabricated railway simply-supported T-shaped beam is pushed into a line position to be erected on the piers to replace the damaged railway roadbed.
In order to facilitate the construction of the bridge piers and the foundation of the railway bridge and reduce the interference of the construction to the railway operation, the pier adopts a portal frame pier. The construction of the bridge pier and the erection of the T beam need to adopt a steel beam erecting hollow line. The novel frame pier structure and the line overhead method and process are adopted for the roadbed bridge reconstruction, and most of construction is carried out in a train running gap except that the line is overhead and a frame beam is constructed in a skylight point. The novel road-to-bridge has the characteristics of simple structure, good mechanical property, simple, convenient and safe construction, low cost, uninterrupted train operation and the like.
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 (4)
1. The construction method for replacing the existing railway roadbed with the railway simply supported T-beam bridge is characterized by comprising the following steps of:
the method comprises the steps of after an existing railway line is built on the ground, replacing the existing railway roadbed with a railway simply-supported T-beam bridge through newly constructing a pier support in the damaged roadbed.
2. The construction method of replacing an existing railway roadbed with a railway simply supported T-beam bridge according to claim 1, characterized in that:
the method specifically comprises the following steps:
step one, constructing a hole digging pile (12), and supporting a D-shaped temporary beam (2) by the hole digging pile (12), wherein the beam is empty of an existing railway line;
step two, constructing a portal frame pier in the damaged roadbed, and assembling a simple T-shaped beam (9) on a bent frame at one side of the line;
step three, after the step two is completed, adjusting the overhead position of the line, supporting a D-shaped temporary beam (2) by using the constructed portal frame pier, wherein the beam is erected with the existing railway line, and the length of the overhead line is exactly the same as that of the bridge to be replaced, so that the bridge can conveniently slide in place in the hole-to-hole mode;
step four, in the skylight point, integrally pushing the line overhead equipment to a line boundary limiting outer platform;
and step five, after the step four is completed, the simply supported T-shaped beam (9) is moved to the pier of the portal frame by the beam moving trolley (8) through the beam moving slide way (7), a support is installed, and the existing railway roadbed is changed into a railway bridge.
3. The construction method of replacing an existing railway roadbed with a railway simply supported T-beam bridge according to claim 2, characterized in that:
in the second step, the portal frame pier comprises a frame pier column (6), a frame pier cross beam (5) and a frame pier top cap (4);
firstly, two pier columns (6) of a frame pier are constructed, then frame pier cross beams (5) are constructed on the tops of the two transversely corresponding frame pier columns (6), and finally frame pier top caps (4) are arranged on the tops of the frame pier cross beams (5).
4. The construction method of replacing an existing railway roadbed with a railway simply supported T-beam bridge according to claim 3, characterized in that:
and fifthly, sliding the simply supported T-shaped beam (9) assembled on one side of the line to the lower part of the line along the direction perpendicular to the line along the beam moving slide way (7), and installing the simply supported T-shaped beam on a portal frame pier to finish the structure replacement and construction of changing the roadbed into the bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011110712.0A CN112112049A (en) | 2020-10-16 | 2020-10-16 | Construction method for replacing existing railway roadbed with railway simply-supported T-beam bridge |
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| CN202011110712.0A CN112112049A (en) | 2020-10-16 | 2020-10-16 | Construction method for replacing existing railway roadbed with railway simply-supported T-beam bridge |
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| CN112112049A true CN112112049A (en) | 2020-12-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113026540A (en) * | 2021-04-16 | 2021-06-25 | 中铁第四勘察设计院集团有限公司 | On-bridge track connecting system and method for integral translation of newly-built bridge pier box girder |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113026540A (en) * | 2021-04-16 | 2021-06-25 | 中铁第四勘察设计院集团有限公司 | On-bridge track connecting system and method for integral translation of newly-built bridge pier box girder |
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Application publication date: 20201222 |
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