CN210117646U - Frame bridge for high-fill existing railway line - Google Patents
Frame bridge for high-fill existing railway line Download PDFInfo
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- CN210117646U CN210117646U CN201920736905.3U CN201920736905U CN210117646U CN 210117646 U CN210117646 U CN 210117646U CN 201920736905 U CN201920736905 U CN 201920736905U CN 210117646 U CN210117646 U CN 210117646U
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Abstract
The utility model discloses a frame bridge that is used for high existing railway line of filling, including the frame bridge body, the hole aperture of frame bridge is 9.0m, and the net height is 8.0m, and every section length is 13 meters, the external dimension of frame bridge: the width is 12 meters, the height is 10.2 meters, a rail roadbed is arranged at the bottom in the frame bridge, and drainage side ditches are respectively arranged on two sides of the roadbed. By adopting the frame bridge scheme, the problem of the existing line jacking design of the high-fill square iron interchange is solved. By adopting the frame bridge scheme, the driving safety and the personal safety are ensured to a certain extent, and the investment is saved.
Description
Technical Field
The utility model discloses a under the existing operation railway line, the frame bridge design when bridge type shield constructs the method protection existing railway line, jacking, the improvement design that the board top banket is optimized to "high fill" by "conventional fill", especially a frame bridge that is used for high fill on the existing railway line.
Background
In recent years, with the rapid development of transportation industry, traffic networks are reaching all around, the speed of railways is increased, the running density is increased, the used land is small, the investment is saved, and a frame structure with convenient construction is adopted in large quantity. The method comprises the following steps of generally building a highway-railway overpass structure, and filling soil on the top of a frame bridge slab according to the requirement of track thickness and waterproof; the overpass needing to be jacked by the existing line meets the requirements of erecting steel beams and the thickness of the track and the waterproof requirement, the thickness of the filled soil on the plate tops of the overpass and the steel beams does not exceed 1.0m, and the structural size and the oblique crossing angle can be selected and designed according to a standard drawing; when the existing railway roadbed filling height is higher and the frame bridge slab top filling exceeds the design of a standard diagram, chess can be played variably in the selection of the overpass scheme and the establishment of the structure size, and the quick selection of the scheme is adversely affected.
Disclosure of Invention
An object of the utility model is to provide a frame bridge for on the existing railway line of high fill can be applied to the indisputable overpass that the roof fill exceeds 10m, high fill, reduces the investment, accelerates the construction progress.
The utility model aims at realizing like this, a frame bridge that is used for high existing railway line of fill, including the frame bridge body, the hole aperture of frame bridge is 9.0m, and net height is 8.0m, and every section length is 13 meters, the external dimension of frame bridge: the width is 12 meters, the height is 10.2 meters, a rail roadbed is arranged at the bottom in the frame bridge, and drainage side ditches are respectively arranged on two sides of the roadbed.
The utility model discloses being located interior Mongolia autonomous region Earduos city notes saxoke town and testing, being located the eastern side of packet west line new street station, the planning of commodity circulation garden is south north and south and arranges, and the west faces a packet luxuriant highway, and the north faces little red line (county road), and south faces a house deep line (G210), and packet west railway, new En railway cross in garden planning land used west and side. The special line is led out from a new street station wrapped with west lines, and travels up and down to a Sakak logistics park, and the east station of the new street is arranged in the south-north direction in the park.
The special line untwining line crosses with the Xin En ceramic untwining line at SCK3+430, the height difference from the rail bottom of the special line of the Sagnac warewashing line to the rail bottom of the Xin En ceramic untwining line is 18.41m, and the oblique crossing angle is 30 degrees (the included angle between the normal direction of the Xin En ceramic untwining line and the direction of the Sagnac untwining line). The main technical standards of the Xinen railway are grade I railway, single line, limited gradient of 6 per mill, minimum curve radius of 800m, designed running speed of 120km/h and electric traction.
The bridge adopts a bridge shield advance support and a construction method of jacking with soil (a butt-jacking method and a relay method can be adopted), and hydraulic jacking equipment is adopted for frame jacking. The circuit is reinforced by adopting the buckling rails, the existing track bed structure is not disturbed, and the stability of the existing line is ensured.
Through the case description, the structure is subjected to finite element analysis by using MIDAS, and the internal force of the structure is obtained according to load calculation and model establishment so as to draw up the size of the structure. The analytical results were as follows:
1. load taking and using
1.1 constant load
1.1.1 dead weight of the structure and weight of the building on the upper part of the line,
1.1.1.1 Top plate two-phase constant load
a calculating the dead load of the top of the board according to a single line
The distance from the bottom of the track to the top of the top plate is 10.32m, the thickness of the ballast is 0.5m, and the filling height of the roadbed is 9.82 m.
The volume weight of the ballast layer is 20KN/m3The surface load is 0.5 × 20=10 KN/m2The width is counted as 3.5m (2.5 + 0.5X 2). (Rail bed top width 330cm, sleeper width 250 cm)
The unit weight of the road base layer is 17KN/m3The surface load is 9.82 multiplied by 17=166.94 KN/m2The width is as follows: 3.5+9.82 × 0.5 × 2+1 × 2=15.3 m.
The top plate concrete weight: 1.0 × 25=25 KN/m2
Then W ceiling =10+25+166.94=201.94 KN/m2
b bottom plate second-phase constant load
Single line in the box bridge: the distance from the bottom of the track to the top of the bottom plate is 0.91m, the thickness of the ballast is 0.5m, and the filling height of the roadbed is 0.41 m.
Surface loading: ballast 0.5X 20=10 KN/m2The width is calculated according to 3.5 m;
roadbed filling 0.41 multiplied by 17=7.0 KN/m2Width: 3.2m meter on one side of the center;
the concrete weight of the bottom plate is as follows: 1.2 × 25=30 KN/m2
Then W floor =10+7+30=47 KN/m2
C-side wall dead weight is concentrated force load
W=1.5×6.65×25=249.375 KN
1.1.2 lateral pressure of the soil
According to the basic specification 4.2.3, the horizontal pressure of the roadbed filling acting on the box bridge is calculated according to the formula: e = ε × γ × H1
1.2 live load
1.2.1 list loads
MIDAS is loaded according to the influence surface.
1.2.2 impact force
According to the railway bridge standard, when the filling thickness h of the top plate is more than or equal to 1m (calculated from the rail bottom to the top surface of the top plate), the impact is not considered. Otherwise the impact coefficient is:
1+μ=1+α×（6/(30+L))
wherein α =4(1-h) is less than or equal to 2, and L is the bridge span length (m).
In MIDAS, the impact coefficient can be calculated by the method when the railway frame bridge is selected as the moving load option.
Since the top filling height of the top plate is more than 1.0m, the influence of the impact coefficient is not considered.
And for the floor roof should be considered: 1+ μ =1+4 × (1-0.91) × 6/(30 + 10.5) =1.059
1.2.4 Medium-live Loading
10.5m live load subsection: 7.5m 220KN concentrated force +3m uniform load
Bottom plate top live load: (5 × 220+3 × 92)/(7.5 × 10.5) =17.48 KN/m2
Live load at the bottom of the bottom plate:
distribution width: 1.52 × 2=3.04 (2 cells)
1.52 × 3=4.56 (3 cells)
Live loading: (5 × 220+ (13-7.5) × 92)/(4.56 × 13) =27.1 KN/m2
1.2.3 horizontal soil pressure due to live load
The lateral horizontal soil pressure p of the train live-loaded on the side wall of the frame is determined according to a calculation method of a bridge standard, namely:
e=ξqh
qh=165/(2.5+h)
in the formula: e, qh-pressure (kPa);
ξ -coefficient, according to the stipulation of bridge regulations, according to the actual design situation, take 0.3 in the bridge, calculate the strength value at the center line of the top and bottom of the slab, and act on the side wall with gradient surface load.
1.3 concrete shrinkage
For the integrally cast reinforced concrete structure, the temperature is reduced by 15 ℃, the main structure of the frame bridge is generally poured in 2 steps, a bottom plate is poured firstly, and then a side wall and a top plate are poured, and the temperature is reduced by 10 ℃.
And boundary conditions:
loading according to node elastic support, calculating according to the area of the middle node and the area of the edge node, and calculating according to the coefficient of the substrate bed (t/m)3) =60 × bearing capacity (t/m)2) The bearing capacity is as follows 550 kPa (conversion relation: 1kPa =0.1t/m2）。
And obtaining the elastic rigidity of the middle node and the edge node.
Modeling
① selection of materials
② define the thickness
The thickness of the haunch thickening part is taken according to the unit division size.
③ model building
Due to the fact that the partition widths of the oblique crossing frame nodes of the board units are different, if the oblique crossing frame nodes are input according to coordinates, workload is large. The easy implementation method is that firstly, the unit division dxf format files of the top plate and the bottom plate are respectively divided in the Autocad, a node is established by using an importing method, and then a board unit is established, and the following concrete implementation is realized:
in the CAD, the top plate and the bottom plate dividing units are respectively placed in corresponding top plate and bottom plate layers.
Establishing boundary conditions, 5, structural load, 6, analyzing, 7, extracting results and reinforcing bars;
through above analysis, reach the utility model discloses the structure size of frame bridge.
The utility model has the advantages that: by adopting the frame bridge scheme, the problem of the existing line jacking design of the high-fill square iron interchange is solved. The scheme of the frame bridge is feasible when the existing line of the high-fill square iron overpass is overpassed; the span, clear height and structural size of the frame bridge play a reference role in the project of filling the top of the plate below 10 m; by adopting the bridge type shield jacking scheme of the frame bridge, the idea is developed for the jacking construction of the existing line of the high-fill iron-railway overpass; by adopting the frame bridge scheme, the driving safety and the personal safety are ensured to a certain extent, and the investment is saved.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a cross-sectional view of the box body of the present invention.
Detailed Description
A frame bridge for high fill existing railway lines, as shown in fig. 1, comprising a frame bridge body 1, the inner bore diameter a of the frame bridge is 9.0m, the net height c is 8.0m, each section is 13 meters in length, the outer dimensions of the frame bridge: the width d is 12 meters, the height b is 10.2 meters, a rail roadbed 3 is arranged at the bottom in the frame bridge, and drainage side ditches 2 are respectively arranged at the two sides of the roadbed.
Claims (1)
1. The utility model provides a frame bridge that is used for high existing railway line of filling, includes the frame bridge body, characterized by: the inner hole aperture of the frame bridge is 9.0m, the clear height is 8.0m, the length of each section is 13 m, and the external dimension of the frame bridge is as follows: the width is 12 meters, the height is 10.2 meters, a rail roadbed is arranged at the bottom in the frame bridge, and drainage side ditches are respectively arranged on two sides of the roadbed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920736905.3U CN210117646U (en) | 2019-05-22 | 2019-05-22 | Frame bridge for high-fill existing railway line |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920736905.3U CN210117646U (en) | 2019-05-22 | 2019-05-22 | Frame bridge for high-fill existing railway line |
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| CN210117646U true CN210117646U (en) | 2020-02-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114969921A (en) * | 2022-05-25 | 2022-08-30 | 中铁二院工程集团有限责任公司 | Design method for structural size of railway frame bridge |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114969921A (en) * | 2022-05-25 | 2022-08-30 | 中铁二院工程集团有限责任公司 | Design method for structural size of railway frame bridge |
| CN114969921B (en) * | 2022-05-25 | 2024-03-12 | 中铁二院工程集团有限责任公司 | Design method for structural dimension of railway frame bridge |
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