CN210481901U

CN210481901U - Soft foundation embankment structure of passenger dedicated line

Info

Publication number: CN210481901U
Application number: CN201920467869.5U
Authority: CN
Inventors: 郭帅杰; 宋绪国; 陈洪运; 肖世伟; 刘飞; 王亚坤
Original assignee: China Railway Design Corp
Current assignee: China Railway Design Corp
Priority date: 2019-04-09
Filing date: 2019-04-09
Publication date: 2020-05-08
Anticipated expiration: 2029-04-09

Abstract

The utility model discloses a passenger dedicated line soft foundation embankment structure, which comprises a cantilever U-shaped groove, roadbed filler and a rigid pile foundation, wherein the cantilever U-shaped groove is formed by fixedly connecting a horizontally arranged bottom plate and two vertically arranged side wall plates, and the cross section is in a U shape with an upward opening; the upper ends of the side wall plates extend outwards to form cantilever plates; the roadbed filling is filled in the cantilever U-shaped groove to serve as a railway roadbed foundation bed; the rigid pile foundation is arranged at the bottom of the cantilever U-shaped groove and plays a supporting role. The structure further reduces the width of the cross section of the cantilever U-shaped groove, reduces the foundation stabilization range, reduces the rigid pile consumption and the railway roadbed filler filling amount in the rigid pile composite foundation, and has the advantages of quick construction, low manufacturing cost and good engineering application prospect.

Description

Soft foundation embankment structure of passenger dedicated line

Technical Field

The utility model belongs to the technical field of railway engineering, especially, relate to a passenger traffic special line soft ground embankment structure.

Background

With the continuous expansion of the construction scale of high-speed railways and passenger dedicated lines, the operation mileage of the high-speed railways and the passenger dedicated lines in China breaks through twenty thousand kilometers. Because the settlement and deformation requirements of the high-speed railway and the passenger dedicated line on the lower foundation engineering are strict, the embankment section in the construction of the high-speed railway and the passenger dedicated line is generally in a bridge structure, and a large number of situations of 'taking the way by a bridge' exist. The reason is that when the foundation treatment depth is deeper, the construction cost of the roadbed structure is close to or even exceeds that of the bridge structure, and the reliability of the settlement deformation control of the bridge structure is higher; secondly, the land area of the roadbed structure is large, the earth volume is large, and the land area of the bridge structure is small. The novel roadbed structure of the high-speed railway and the passenger special line is researched and developed, the land and earth volume is reduced, the settlement control effect of roadbed engineering is improved, and the engineering investment is saved.

At present, the U-shaped groove structure is partially applied to railway roadbed construction, but the height of the U-shaped groove structure is low, and the earth filled embankment on the upper portion of the U-shaped groove still adopts a slope-releasing structure, so that the effect of reducing the earth volume of the railway embankment is not obvious, and the foundation treatment volume is still relatively large.

Disclosure of Invention

The utility model aims at providing a passenger dedicated line soft ground embankment structure that simple structure, price/performance ratio are outstanding.

Therefore, the technical scheme of the utility model is as follows:

a passenger dedicated line soft foundation embankment structure comprises a cantilever U-shaped groove, roadbed fillers and a rigid pile foundation, wherein the cantilever U-shaped groove is formed by fixedly connecting a horizontally arranged bottom plate and two vertically arranged side wall plates, and the section of the cantilever U-shaped groove is in a U shape with an upward opening; the upper ends of the side wall plates extend outwards to form cantilever plates; the roadbed filling is filled in the cantilever U-shaped groove to serve as a railway roadbed foundation bed; the rigid pile foundation is arranged at the bottom of the cantilever U-shaped groove and plays a supporting role.

For newly-built railways, the upper ends of the two side wall plates respectively extend outwards to form a cantilever plate. When the side wall plate is close to the existing railway line, the upper end of the side wall plate far away from the existing railway line extends outwards to form a cantilever plate.

When the height of the cantilever U-shaped groove exceeds 4m, the two side wall plates are connected through a connecting beam structure or an anchor cable tensioning structure. Or the roadbed filler adopts light soil or a geogrid reverse-wrapping roadbed filler filling mode.

Preferably, a floor cantilever is connected to one or both sides of the floor as needed to increase the lateral width of the floor. In addition, the cantilever plate is also provided with a protective fence, a cable trough and a contact net upright post, and reinforcing ribs are arranged at the position of the contact net upright post. The rigid pile foundation is a CFG pile, a prefabricated pipe pile or a cast-in-place pile.

The utility model has the advantages and positive effects that:

by adopting the technical scheme, the soft foundation embankment structure of the passenger special line is based on the traditional U-shaped groove, the cantilever plate is additionally arranged to serve as the railway roadbed curb structure, the cross section width of the U-shaped groove is further reduced, the foundation reinforcement range is reduced, the rigid pile consumption in the rigid pile composite foundation and the railway roadbed filler filling amount are reduced, and the embankment structure is simple, low in manufacturing cost and good in engineering application prospect, and has wide application space and popularization and application values in railway engineering construction.

Drawings

FIG. 1 is a schematic cross-sectional view of an open-ended cantilevered U-channel embankment structure of the present invention;

FIG. 2 is a schematic cross-sectional view of a closed cantilever U-groove embankment structure according to the present invention;

fig. 3a-3c are schematic cross-sectional views of the cantilever U-shaped groove embankment structure of the present invention under a high fill condition, wherein the cantilever U-shaped groove embankment structure is respectively provided with a transverse tie beam structure, a geogrid reverse-wrapped packing structure and a bottom plate cantilever;

fig. 4 is the cross-sectional schematic view of the cantilever U-shaped groove embankment structure of the newly-built passenger dedicated line close to the existing railway.

In the figure:

1. cantilever U-shaped groove 1a, bottom plate 1b and side wall plate

1c, cantilever plate 1d, bottom plate cantilever 1d, top plate

2. Roadbed filler 3, rigid pile foundation 4 and concrete base

5. Track plate steel rail supporting system 6, protective fence 7 and train

8. Connecting beam structure 9 and geogrid reverse-wrapping roadbed filler

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

As shown in figure 1, the utility model discloses a soft foundation embankment structure of passenger special line, including cantilever U-shaped groove 1, road bed filler 2 and rigid pile basis 3. The cantilever U-shaped groove 1 is formed by fixedly connecting a horizontally arranged bottom plate 1a and two vertically arranged side wall plates 1b, the section of the cantilever U-shaped groove is in a U shape with an upward opening, the upper ends of the side wall plates 1b extend outwards to form cantilever plates 1c, and the cantilever plates 1c are used as road shoulder structures; roadbed fillers 2 are filled in the cantilever U-shaped grooves 1 to serve as a roadbed of the railway, and a reinforced concrete base 4 and a track slab steel rail supporting system 5 are arranged on the surface layer of the roadbed. The rigid pile foundation 3 is arranged at the bottom of the cantilever U-shaped groove 1 and plays a supporting role. The roadbed filling 2 can adopt common roadbed filling or light soil filling.

Fig. 2 shows another embodiment of the present invention, which is different from the structure of embodiment 1 in that the cantilever U-shaped groove 1 is in a closed form and has no roadbed filling 2 filled therein, that is: a top plate 1e is additionally arranged at the opening of the cantilever U-shaped groove 1, and a concrete base 4 and a track slab steel rail supporting system 5 are directly arranged on the top plate 1 e.

Referring to fig. 1-3 b, for a newly-built passenger dedicated line, cantilever plates 1c are arranged on both sides; referring to fig. 4, when constructing adjacent to the existing railway line, the cantilever plate 1c is provided only on the side away from the existing railway line. The cantilever plate 1c also has the carrier of the auxiliary structures such as the protective fence 6, the cable trough, the contact net upright post and the like, and the rib is arranged at the position of the contact net upright post to play a role in reinforcement.

In addition, referring to fig. 3c and 4, a base plate cantilever 1d may be additionally provided on one side or both sides of the base plate 1a according to design requirements to increase the lateral width of the base plate 1 a.

Referring to the drawings, when the height of the cantilever U-shaped channel 1 is high, one or more tie beam structures 8 may be provided between the two side wall plates 1b as required. Or the roadbed filling material in the cantilever U-shaped groove adopts light soil or a filling mode that geogrid reversely wraps the roadbed filling material 9.

The cantilever plate range of the cantilever U-shaped groove 1 is between the outer edge of the concrete base plate 4 and the road shoulder line. When the roadbed height of the cantilever U-shaped groove exceeds 4m, a connecting beam structure 8 or an anchor cable tensioning structure can be transversely arranged in the cantilever U-shaped groove to resist the horizontal soil pressure of filling soil.

The rigid pile foundation can be a rigid pile foundation in structural forms of CFG piles, precast tubular piles, cast-in-place piles and the like, and the pile top is connected with the bottom plate 1 a.

The utility model discloses a work progress as follows:

as shown in figure 1, a soft foundation embankment structure of a passenger special line is a cantilever U-shaped groove roadbed in an opening form of a newly-built railway line, firstly reinforcing the soft foundation along the newly-built passenger special line, forming a rigid pile foundation 3 by adopting foundation reinforcing treatment forms such as cast-in piles, precast tubular piles, CFG piles and the like, carrying out reinforced concrete pouring construction of a cantilever U-shaped groove 1 on the rigid pile foundation 3, wherein the concrete label is not less than C40, firstly pouring a bottom plate 1a, rigidly connecting the bottom plate with the pile top of the rigid pile, then erecting a template structure of a cantilever U-shaped groove side wall plate 1b and a cantilever plate 1C, pouring reinforced concrete in layers, after the cantilever U-shaped groove 1 is maintained to the design age, filling and compacting roadbed fillers 2 in the cantilever U-shaped groove 1 in layers, wherein common fillers or light soil fillers can be selected for the roadbed, and after the roadbed construction of the roadbed is completed, the construction of a concrete base 4, and after the strength requirement is met, constructing a track plate and a track supporting system 5, and arranging a protective fence 6 at the edge of the cantilever plate 1 c.

In the newly-built passenger dedicated line closed cantilever U-shaped groove roadbed structure shown in fig. 2, after the pouring of the side wall plate 1b is completed, concrete templates of a cantilever plate 1c and a top plate 1e are erected, the concrete templates are formed by one-step pouring, and a concrete base 4 and a track plate steel rail supporting system 5 are directly arranged on the top plate 1 e.

In the case of a high roadbed, as shown in fig. 3a, in the first mode, during the pouring process of the side wall plate 1b, one or more tie beam structures 8 can be added to limit the lateral displacement of the side wall plate 1b of the cantilever U-shaped groove, and the tie beam structure can be a reinforced concrete structure or an anchor cable structure. In the second mode, as shown in fig. 3b, during the filling process of the roadbed filling 2 in the cantilever U-shaped groove 1, the geogrid is adopted to reversely wrap the roadbed filling 9, and the transverse restraint of the roadbed filling is provided by the tension of the geogrid. In the third mode, as shown in fig. 3c, during the construction of the base plate 1a, base plate cantilevers 1d are additionally arranged on two sides of the base plate 1a, so that the anti-overturning stability of the roadbed structure is improved. According to the three embodiments, different measures are newly added, so that the transverse deformation of the special-shaped groove is controllable under the action of the dynamic load of the train 7 in the cantilever U-shaped groove structure, and the anti-sliding and anti-overturning stability meets the requirements.

As shown in fig. 4, when a new passenger dedicated line approaches an existing railway, in order to reduce the influence on the existing roadbed slope, a cantilever plate 1c and a base plate cantilever 1d can be arranged on one side. Meanwhile, due to the fact that the cantilever U-shaped groove structure is used for collecting the slope, the foundation reinforcing range of the newly-built passenger special line is greatly reduced, the filling earth volume of the side slope of the roadbed is obviously reduced, the construction cost is controllable, and the cost performance is outstanding.

While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. All equivalent changes, modifications and the like made according to the application scope of the utility model should fall within the coverage of the utility model.

Claims

1. The utility model provides a passenger transport special line soft ground embankment structure which characterized in that: comprises a cantilever U-shaped groove (1), roadbed filling (2) and a rigid pile foundation (3),

the cantilever U-shaped groove (1) is formed by fixedly connecting a horizontally arranged bottom plate (1a) and two vertically arranged side wall plates (1b), and the section of the cantilever U-shaped groove is in a U shape with an upward opening; the upper end of the side wall plate (1b) extends outwards to form a cantilever plate (1 c); the roadbed filling materials (2) are filled in the cantilever U-shaped grooves (1) and serve as a railway roadbed foundation bed; the rigid pile foundation (3) is arranged at the bottom of the cantilever U-shaped groove (1) and plays a supporting role.

2. The passenger dedicated line soft foundation embankment structure according to claim 1, wherein: for newly built railways, the upper ends of the two side wall plates (1b) extend outwards respectively to form a cantilever plate (1 c).

3. The passenger dedicated line soft foundation embankment structure according to claim 1, wherein: when the side wall plate (1b) is close to the existing railway line, the upper end of the side wall plate (1b) far away from the existing railway line extends outwards to form a cantilever plate (1 c).

4. The passenger dedicated line soft foundation embankment structure according to claim 1, wherein: when the height of the cantilever U-shaped groove (1) exceeds 4m, the two side wall plates (1b) are connected through a connecting beam structure (8) or an anchor cable tensioning structure.

5. The passenger dedicated line soft foundation embankment structure according to claim 1, wherein: and when the height of the cantilever U-shaped groove (1) exceeds 4m, the roadbed filler adopts light soil or a geogrid reverse-wrapping roadbed filler (9) filling mode.

6. The passenger dedicated line soft foundation embankment structure according to any one of claims 1 to 5, wherein: and a bottom plate cantilever (1d) is connected to one side or both sides of the bottom plate (1a) and used for increasing the transverse width of the bottom plate.

7. The passenger dedicated line soft foundation embankment structure according to claim 6, wherein: the cantilever plate (1c) is further provided with a protective fence (6), a cable trough and a contact net upright post, and reinforcing ribs are arranged at the position of the contact net upright post.

8. The passenger dedicated line soft foundation embankment structure according to claim 7, wherein: the rigid pile foundation (3) is a CFG pile, a prefabricated tubular pile or a cast-in-place pile.