CN111058338A

CN111058338A - Light roadbed structure of high-speed railway

Info

Publication number: CN111058338A
Application number: CN201911358770.2A
Authority: CN
Inventors: 宋绪国; 郭帅杰; 陈洪运; 肖世伟; 王铸
Original assignee: China Railway Design Corp
Current assignee: China Railway Design Corp
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2020-04-24

Abstract

The invention discloses a light roadbed structure of a high-speed railway, which comprises a box roadbed, a cantilever structure and a rigid pile foundation, wherein the box roadbed is provided with a cantilever structure; the box-shaped roadbed comprises a top plate, two side wall plates and a bottom plate, wherein the top plate, the two side wall plates and the bottom plate are integrally formed and horizontally arranged; two ends of the top plate extend outwards to form outer cantilevers respectively, extend towards the center line of the roadbed to form inner cantilevers, and damping rubber materials are filled between the adjacent inner cantilevers to seal and stop water; the track plate and the track supporting system are arranged on the top plate, the anti-collision wall, the cable trough and the contact net upright column base are sequentially arranged on the outer cantilever, and the end part of the outer cantilever is provided with a protective fence; a vertical drainage pore channel is arranged at the position, close to the outer side wall plate, of the top plate of the box-shaped roadbed; the rigid pile foundation is arranged at the bottom of the box type roadbed. The method greatly reduces the slope-releasing range of the high-speed railway embankment side slope, reduces the foundation reinforcement engineering quantity, and reduces the rigid pile consumption and the railway roadbed filling quantity.

Description

Light roadbed structure of high-speed railway

Technical Field

The invention belongs to the technical field of railway engineering, and particularly relates to a light roadbed structure of a high-speed railway.

Background

The conventional high-speed railway subgrade is constructed mostly in a subgrade filler compaction mode, the subgrade section form is mostly a standard trapezoid section, the subgrade body is self-heavy, the section transverse occupation range is wide, the reinforcement range of the high-speed railway subgrade is large, the treatment depth is deep, the earthwork engineering quantity is high, and the adverse factors restrict the further popularization and application of the conventional subgrade structure in the high-speed railway engineering construction. Particularly, for a high-speed rail turnout area and a connecting line rail connecting area, the conventional road filling subgrade structure is adopted, so that the cross section of the subgrade is large, and the problem of mutual influence of additional settlement deformation of two subgrades is solved. For reducing the occupation of land scope of traditional trapezoidal section roadbed structure, control roadbed body structure dead weight, retaining wall structure obtains the popularization and application of certain degree in the high-speed railway road bed, nevertheless because light-duty retaining wall structure is mostly cantilever or counterfort structure, need fill the road bed filler behind the wall and carry out the compaction construction, leads to light-duty retaining wall body lateral deformation great relatively, mainly is applied to the protection of key point in the engineering and handles.

In order to control the self weight of the high-speed railway filling subgrade, the structural form of the box subgrade becomes an important direction for future development of the high-speed railway subgrade in China, the box structure is mainly applied to high-speed railway bridge engineering, and the lightweight of the high-speed railway bridge deck structure is realized through the prefabricated assembly of the box sections. Therefore, around the aspect of the light-duty of high-speed railway road bed, refer to the design concept of high-speed railway bridge, need urgently to develop a novel high-speed railway light-duty road bed structure which can effectively reduce the section of a road bed and the dead weight of the structure, has less land occupation and low cost and has safe and reliable structure.

Disclosure of Invention

The invention aims to provide a light roadbed structure of a high-speed railway, which can effectively reduce the self weight of the high-speed railway, accords with the roadbed engineering characteristics of a turnout area (a rail connecting area), has less land occupation and low manufacturing cost, and has a safe and reliable structure.

Therefore, the technical scheme of the invention is as follows:

a light roadbed structure of a high-speed railway comprises a box roadbed (1), a cantilever structure (2) and a rigid pile foundation (3), wherein the box roadbed (1) is formed by fixedly connecting a horizontally arranged top plate (1a), two vertically arranged side wall plates (1b) and a horizontally arranged bottom plate (1c), and the outline of the section of the box roadbed is a closed rectangle; two sides of the top plate (1a) extend outwards respectively to form cantilever structures (2); the rigid pile foundation (3) is arranged at the bottom of the box type roadbed (1) and is fixedly connected with the bottom plate (1c) in an embedded mode to play a supporting role.

For a single-line high-speed rail, the cantilever structures (2) on two sides of the top plate (1a) are symmetrically arranged. Roof (1a) middle part sets up track board and track braced system (5) cantilever structure (2) are gone up and are set gradually crashproof wall (6), cable duct (7) and contact net stand base (8) from inside to outside, are being close to cantilever structure (2) outer end department and are being provided with protective fence (9).

In addition, a plurality of vertical drainage pore canals (10) are arranged at intervals on the top plate (1a) of the box-shaped roadbed (1) close to the cantilever structure (2) and used for draining water to the outer side of the box-shaped roadbed (1).

For the double-track high-speed rail, the box-shaped roadbed (1) is arranged in parallel and symmetrically and respectively bears the load of the rail and the train; and two sides of each top plate (1a) extend outwards to form an outer cantilever (2a) and extend towards the center line of the roadbed to form an inner cantilever (2b), and the overhanging width of the outer cantilever (2a) is greater than that of the inner cantilever (2 b). Preferably, a damping rubber material (4) is filled between the two inner cantilevers (2b) between the two box-shaped roadbed (1), so that the two adjacent inner cantilevers (2b) are flexibly connected to seal water. The region of roof (1a) preferred line center sets up track board and track braced system (5), every set gradually crashproof wall (6), cable duct (7) and contact net stand base (8) from inside to outside on outer cantilever (2a), be provided with safety fence (9) in the outer end department that is close to outer cantilever (2 a). In addition, a plurality of vertical drainage channels (10) are arranged at intervals at the position, close to the outer side wall plate (1b), of the top plate (1a) of each box-shaped roadbed (1) and used for draining water to the outer side of the box-shaped roadbed (1).

The rigid pile foundation can be a CFG pile, a precast tubular pile or a cast-in-place pile.

The invention has the advantages and positive effects that:

1. by adopting the technical scheme, the high-speed railway foundation becomes a box-shaped foundation structure, the road shoulders on two sides and the center area of the foundation are both cantilever structures, and the box-shaped foundation is a hollow structure, so that the self weight of the foundation structure is reduced by about 50 percent compared with the traditional road filling foundation, the amount of the foundation filling engineering is reduced to 0, the foundation reinforcing range is reduced by 50 to 70 percent, the influence on the surrounding environment is reduced, and the high-speed railway foundation is particularly suitable for the high-speed railway foundation engineering with extremely strict foundation settlement control.

2. The high-speed railway foundation structure is formed by arranging two independent box-shaped foundations in parallel, and the damping rubber filling layer between the cantilevers in the box-shaped foundations is arranged, so that flexible connection of the two box-shaped foundations is kept, water is sealed, and the high-speed railway foundation structure is particularly suitable for areas with violent changes in the section forms of the foundations, such as a turnout area foundation, a tie line rail connecting area and the like.

3. The structure is used as a light roadbed structure form of the high-speed railway, has low manufacturing cost and large engineering application prospect, is the key optimization improvement direction of the traditional road bed filling structure, and has wide application space and popularization and application values in the high-speed railway engineering construction of China.

Drawings

Fig. 1 is a schematic sectional view of a light roadbed structure of a high-speed railway according to the invention.

In the figure:

1. box-shaped roadbed 1a, top plate 1b and side wall plate

1c, a bottom plate 2, a cantilever structure 2a and an outer cantilever

2b, an inner cantilever 3, a rigid pile foundation 4 and a damping rubber material

5. Track board and track braced system 6, crashproof wall 7, cable duct

8. Contact net upright post base 9, protective fence 10 and vertical drainage channel

Detailed Description

The light roadbed structure of the high-speed railway is described in detail with reference to the attached drawings and the embodiment.

Example one

Referring to fig. 1, an embodiment of the present invention is shown in which the high speed railway is a two-track high speed railway. As shown in the figure, the light roadbed structures of the high-speed railway are arranged in parallel along the extension direction of the high-speed railway and respectively bear the load action of the track and the train.

Each high-speed railway light roadbed structure comprises a box type roadbed 1, a cantilever structure 2 and a rigid pile foundation 3. Specifically, the box-shaped roadbed 1 includes: a top plate 1a arranged horizontally, two side wall plates 1b arranged vertically and a bottom plate 1c arranged horizontally are integrally formed, all components are fixedly connected in sequence to form a closed box-shaped structure, and the outline of the cross section of the roadbed structure is in a closed rectangle shape. The cantilever structure 2 is formed by the left end and the right end of a top plate 1a of the box-type roadbed 1 in an outward extending mode respectively, wherein the top plate 1a extends outwards to form an outer cantilever 2a, the top plate extends towards the center line direction of the roadbed to form an inner cantilever 2b, and the overhanging width of the outer cantilever 2a is larger than that of the inner cantilever 2 b. The rigid pile foundation 3 is arranged at the bottom of the box type roadbed and is fixedly connected with the bottom plate to play a supporting role.

In addition, a track plate and a track supporting system 5 are arranged on the top plate 1a in a region deviated from the center of a line, an anti-collision wall 6, a cable trough 7 and a contact net upright column base 8 are sequentially arranged on the outer cantilever 2a from inside to outside according to the conventional arrangement of a high-speed railway, and a protective fence 9 is arranged at the end part of the outer cantilever; in order to ensure the rapid drainage of accumulated water on the surface of the roadbed, a vertical drainage pore channel 10 is arranged at the position of a top plate 1a of the box-shaped roadbed, which is close to an outer side wall plate 1b and is used for draining water to the outer side of the roadbed.

In addition, damping rubber materials 4 are filled between the inner cantilevers 2b of the two box-shaped roadbed 1, so that flexible connection of adjacent structures is ensured, and water sealing is realized. The rigid pile foundation 3 can adopt CFG piles, prefabricated pipe piles or cast-in-place piles.

Referring to fig. 1, the construction of the light roadbed structure of the high-speed railway can be implemented by using a prefabrication and cast-in-place mode, and in this embodiment, only the implementation process of the cast-in-place mode is described.

When the light roadbed structure of the high-speed railway is manufactured, firstly, the foundation in the filling range of the high-speed railway foundation is reinforced, a cast-in-place pile type rigid pile foundation 3 is adopted, 2 cast-in-place piles are arranged under a single box-shaped roadbed 1, 4 cast-in-place piles are arranged in the section range of the roadbed, and cast-in-place pile top vertical steel bars with the length not less than 0.5m are reserved;

secondly, erecting a template and binding reinforcing steel bars on the reinforced rigid pile foundation, anchoring the pile top reinforcing steel bars of the cast-in-place pile with the rigid reinforcing steel bars of the bottom plate 1C after bending, and performing casting construction on the bottom plate 1C of the box-shaped roadbed 1, wherein the grade of concrete is not less than C30;

then, sequentially binding reinforcing steel bars of the side wall plates 1b, erecting templates of the side wall plates 1b, after pouring of the side wall plates 1b is completed, continuously erecting a top plate 1a of the box-shaped roadbed 1 and templates of an outer cantilever 2a and an inner cantilever 2b in the cantilever structure 2, pouring concrete after binding the reinforcing steel bars at corresponding positions, wherein the grade of the concrete is not less than C30, curing the concrete to a design age, and reserving a vertical drainage pore channel 10 at a position adjacent to the side wall plates 1b during top plate pouring;

then, filling damping rubber materials in the gap between the inner cantilevers 2b of the two box-type roadbeds 1, and sealing and stopping water;

then, the concrete is cured to the design age, after the strength meets the design requirement, a track plate and a steel rail supporting system are laid, the upper surface of the outer cantilever 2a is sequentially provided with an anti-collision wall 6, a cable trough 7 and a contact net upright column base 8 from inside to outside, and the end part of the outer cantilever 2a is provided with a protective fence 9.

And finishing pouring construction of the light roadbed structure of the high-speed railway. Through the setting of above-mentioned high-speed railway box roadbed structure, left and right roadbed structure bears separately, can furthest reduce the ground reinforcement scope, and the gradual change adjustment of the road direction along the road section of being convenient for is particularly useful for special high-speed railway roadbed sections such as switch district, tie line connection rail district.

Example two

For a single-track high-speed railway, the light roadbed structure of the high-speed railway comprises a box type roadbed 1, a cantilever structure 2 and a rigid pile foundation 3. The box-shaped roadbed 1 is formed by fixedly connecting a horizontally arranged top plate 1a, two vertically arranged side wall plates 1b and a horizontally arranged bottom plate 1c, and the outer contour of the section of the roadbed is a closed rectangle; two sides of the top plate 1a respectively extend outwards to form a cantilever structure 2; the rigid pile foundation 3 is arranged at the bottom of the box-type roadbed 1 and is fixedly connected with the bottom plate 1c to play a supporting role. The cantilever structures 2 on the two sides of the top plate 1a are symmetrically arranged, the track plate and the track supporting system 5 are arranged in the middle of the top plate 1a, the anti-collision wall 6, the cable trough 7 and the contact net upright column base 8 are sequentially arranged on the cantilever structures 2 from inside to outside, and the protective fence 9 is arranged at the position close to the outer end of the cantilever structures 2. In addition, a plurality of vertical drainage channels 10 are arranged at intervals on the top plate 1a of the box-shaped roadbed 1 near the cantilever structure 2 and used for draining water to the outer side of the box-shaped roadbed 1.

In conclusion, compared with the traditional high-speed railway roadbed, the light roadbed structure of the high-speed railway provided by the invention is effectively improved in the aspects of roadbed structure form, specific functions, application field and the like, the treatment range of the high-speed railway base and the quantity of roadbed filling engineering are greatly reduced, the land area of the high-speed railway base is reduced, the whole construction cost of the engineering is obviously reduced, the economic index is prominent, the light roadbed structure of the high-speed railway conforms to the future optimization and improvement direction of the high-speed railway base in China, and the light roadbed structure has higher engineering popularization and application values.

While specific embodiments of the present invention have been described in detail, the description is merely illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention. All equivalent changes, modifications and the like made within the scope of the present invention shall fall within the scope of the present invention.

Claims

1. The utility model provides a light-duty roadbed structure of high-speed railway which characterized in that: comprises a box type roadbed (1), a cantilever structure (2) and a rigid pile foundation (3),

the box-shaped roadbed (1) is formed by fixedly connecting a horizontally arranged top plate (1a), two vertically arranged side wall plates (1b) and a horizontally arranged bottom plate (1c), and the outer contour of the section of the roadbed is a closed rectangle; two sides of the top plate (1a) extend outwards respectively to form cantilever structures (2); the rigid pile foundation (3) is arranged at the bottom of the box type roadbed (1) and is fixedly connected with the bottom plate (1c) in an embedded mode to play a supporting role.

2. The light roadbed structure of the high-speed railway, according to claim 1, wherein: the cantilever structures (2) on two sides of the top plate (1a) are symmetrically arranged.

3. The light roadbed structure of the high-speed railway, according to claim 2, wherein: roof (1a) middle part sets up track board and track braced system (5) cantilever structure (2) are gone up and are set gradually crashproof wall (6), cable duct (7) and contact net stand base (8) from inside to outside, are being close to cantilever structure (2) outer end department and are being provided with protective fence (9).

4. The light roadbed structure of the high-speed railway, according to claim 2, wherein: a plurality of vertical drainage pore canals (10) are arranged at intervals on the top plate (1a) of the box-shaped roadbed (1) close to the cantilever structure (2) and used for draining water to the outer side of the box-shaped roadbed (1).

5. The light roadbed structure of the high-speed railway, according to claim 1, wherein: the high-speed railway is a double-line high-speed rail, the box-shaped roadbed (1) is arranged symmetrically in parallel and respectively bears the load of a track and a train; and two sides of each top plate (1a) extend outwards to form an outer cantilever (2a) and extend towards the center line of the roadbed to form an inner cantilever (2b), and the overhanging width of the outer cantilever (2a) is greater than that of the inner cantilever (2 b).

6. The light roadbed structure of the high-speed railway, according to claim 5, wherein: and a damping rubber material (4) is filled between the two inner cantilevers (2b) between the two box-shaped roadbed (1), so that the two adjacent inner cantilevers (2b) are flexibly connected to seal water.

7. The light roadbed structure of the high-speed railway, according to claim 5, wherein: the region of roof (1a) preferred line center sets up track board and track braced system (5), every set gradually crashproof wall (6), cable duct (7) and contact net stand base (8) from inside to outside on outer cantilever (2a), be provided with safety fence (9) in the outer end department that is close to outer cantilever (2 a).

8. The light roadbed structure of the high-speed railway, according to claim 7, wherein: and a plurality of vertical drainage pore canals (10) are arranged at intervals on the top plate (1a) of each box-shaped roadbed (1) close to the outer side wall plate (1b) and are used for draining water to the outer side of the box-shaped roadbed (1).

9. The light roadbed structure of the high-speed railway according to any one of claims 1 to 8, wherein: the rigid pile foundation (3) is a CFG pile, a prefabricated tubular pile or a cast-in-place pile.