CN110055826B - Construction method of cutting rack rail reinforced track bed structure - Google Patents
Construction method of cutting rack rail reinforced track bed structure Download PDFInfo
- Publication number
- CN110055826B CN110055826B CN201910348007.5A CN201910348007A CN110055826B CN 110055826 B CN110055826 B CN 110055826B CN 201910348007 A CN201910348007 A CN 201910348007A CN 110055826 B CN110055826 B CN 110055826B
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- Prior art keywords
- ballast
- surface layer
- friction
- roadbed
- drainage
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Classifications
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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
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/001—Track with ballast
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/008—Drainage of track
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B25/00—Tracks for special kinds of railways
- E01B25/02—Tracks for rack railways
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Railway Tracks (AREA)
Abstract
A method for constructing reinforced ballast bed structure of cutting toothed rail for greatly increasing the overall stability and antiskid power of ballast and ensuring the safety of high-gradient toothed rail. The road bed comprises drainage ditches arranged on two lateral sides of the road bed, a road bed surface layer filled between side walls on the inner sides of the drainage ditches on two sides, and ballast filled on the road bed surface layer, wherein a track structure is buried at the top of the ballast. The drainage ditch is of a reinforced concrete different-height side wall structure, the inner side wall of the drainage ditch vertically extends upwards to form a high side wall, friction pads fixed by U-shaped nails are paved on the top surface of the roadbed surface layer, and friction bars penetrating through the friction pads and entering the roadbed surface layer are longitudinally and transversely arranged at intervals. The friction pad is continuously provided with a small gabion cage which is fixedly connected with the friction bar, ballast is filled in the small gabion cage, vibration is compact, and the track structure is buried at the top of the ballast.
Description
Technical Field
The invention relates to roadbed engineering, in particular to cutting engineering of an ultra-large gradient toothed rail railway.
Background
The toothed rail is a railway with strong climbing performance, so the longitudinal slope of the line can be larger, and sometimes the gradient can even reach more than 40 degrees, which is also called as a mountain climbing railway. When the longitudinal slope of the line is greater than 40 degrees, the frictional resistance between the toothed rail ballast and the rolling flat road base surface is possibly insufficient to meet the corresponding safety coefficient, and the frictional resistance reserve between the ballasts is also insufficient, so that the cutting toothed rail reinforced ballast bed structure and the construction method have important significance, and are beneficial to ensuring the operation safety of the ultra-large gradient toothed rail, the economical efficiency and the environmental protection of the toothed rail construction and popularization and application.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for constructing an enhanced ballast bed structure of a cutting rack railway, which is used for greatly enhancing the overall stability and the anti-skid capability of ballast, ensuring the safety of a large-gradient rack railway and having good economical efficiency.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention relates to a method for constructing a cutting rack railway reinforced ballast bed structure, which comprises drainage ditches arranged on two lateral sides of a roadbed, roadbed surface layers filled between inner side walls of the drainage ditches on two sides, and ballasts filled on the roadbed surface layers, wherein a track structure is embedded at the top of the ballasts, the drainage ditches are reinforced concrete different-height side wall structures, the inner side walls of the drainage ditches vertically extend upwards to form high side walls, friction pads fixed by U-shaped nails are paved on the top surface of the roadbed surface layers, and friction bars of which the lower parts penetrate through the friction pads to enter the roadbed surface layers are longitudinally and transversely arranged at intervals; the friction pad is continuously provided with a small gabion cage fixedly connected with the friction bar, ballast is filled in the small gabion cage, vibration is compact, and a track structure is buried at the top of the ballast;
the top surface of the roadbed surface layer is provided with a drainage gradient which is not less than 4% from the center of the roadbed to two sides; the high side walls of the drainage ditches at the two sides are provided with drainage holes at intervals of 1.0-2.0m along the line direction, and the inner ports of the drainage holes correspond to the elevation positions of the top surface part of the roadbed surface layer;
the roadbed surface layer is close to the filler of the high side wall side of the drainage ditch (20) with the width ranging from 0.2 m to 0.5m, and 3 weight percent of cement is doped into the filler;
the upper part of the friction bar is exposed out of the friction pad, and the small gabion cage is fixedly connected with the exposed section of the friction bar in a binding way;
the small gabion cages are arranged in two layers, wherein the top surface of the lower small gabion cage is positioned at the bottom elevation position of the track structure;
the construction method comprises the following steps:
(1) cutting is excavated in layers and slope protection is performed in time until the top of the roadbed surface layer is high;
(2) digging foundation pits of drainage ditches at two sides, constructing the drainage ditches in time, and reserving drainage holes on high side walls of the drainage ditches;
(3) after the concrete of the drainage ditches reaches 75% of the design strength, excavating foundation pits between the drainage ditches at two sides;
(4) filling a roadbed surface layer in a foundation pit in a layered manner, and doping 3% cement by weight into roadbed surface layer filling materials with the width ranging from 0.2 m to 0.5m close to the high side wall side of the drainage ditch;
(5) paving a friction pad on the top surface of the roadbed surface layer, and tensioning and straightening;
(6) the U-shaped nails are inserted into the friction pad at intervals, and the lower parts of the U-shaped nails penetrate through the friction pad to be fixed in the surface layer of the foundation bed;
(7) penetrating through the friction pad and driving a friction bar into the surface layer of the roadbed;
(8) placing a small gabion cage on the friction pad, and binding and fixedly connecting the small gabion cage with the exposed section of the friction bar;
(9) ballast is filled in the small gabion cage, and the small gabion cage is vibrated and compacted to the height of the bottom of the track structure;
and placing a track structure on top of the ballast, paving the rest ballast among the track structures, and vibrating for compaction.
The invention has the beneficial effects that a layer of friction pad with high friction coefficient is paved and fixed on the top surface of the flat roadbed surface layer, so that the friction between the ballast and the roadbed surface layer is enhanced, the ballast is filled into a small gabion cage, the friction between the ballast is increased, and the overall stability and the anti-skid capability of the ballast are greatly enhanced through the interaction between the friction bar and the roadbed surface layer, and the safety of a high-gradient toothed rail railway is ensured; the high side walls of the drainage ditches on the two sides of the roadbed play a role in blocking the ballast, so that the ballast is prevented from being unstable in the transverse direction of the roadbed, the width of a roadbed surface is reduced, the land is saved, the cutting amount is reduced, and the engineering economy is good; 3% of cement is doped into roadbed surface layer filling materials in the range of 0.2-0.5m close to the high side wall, so that the filling and compacting effects are facilitated, the infiltration of water is reduced, and the infiltration water can be discharged through a drain hole on the high side wall of the drainage ditch; the construction method is simple to operate, easy to control the quality, favorable for saving engineering investment and capable of being popularized and applied on a large scale.
Drawings
The specification includes four drawings as follows:
FIG. 1 is a schematic cross-sectional view of a cutting rack railway enhanced ballast bed structure of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1A;
FIG. 3 is an enlarged view of a portion B of FIG. 1;
fig. 4 is a schematic cross-sectional view of a conventional toothed rail railway cutting structure.
The component names and corresponding labels are shown: the road bed surface layer 10, ballast 11, a small gabion 12, a friction pad 13, a U-shaped nail 14, a friction bar 15, a drainage ditch 20, a drainage hole 21 and a track structure 30.
Description of the embodiments
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
referring to fig. 1, 2 and 3, the cutting rack railway reinforced ballast bed structure of the present invention includes drainage ditches 20 provided at both lateral sides of a ballast bed, a ballast bed surface layer 10 filled between inner side walls of the drainage ditches 20 at both sides, and ballast 11 filled above the ballast bed surface layer 10, and a track structure 30 buried at the top of the ballast 11. The drainage ditch 20 is of a reinforced concrete different-height side wall structure, the inner side wall of the drainage ditch vertically extends upwards to form a high side wall, the roadbed surface layer 10 is filled between the two high side walls, friction pads 13 fixed by U-shaped nails 14 are paved on the top surface of the roadbed surface layer 10, and friction bars 15, the lower parts of which penetrate through the friction pads 13 and enter the roadbed surface layer 10, are longitudinally and transversely arranged at intervals. The friction pad 13 is continuously provided with a small gabion 12 fixedly connected with the friction bar 15, the small gabion 12 is filled with ballast 11 and is vibrated tightly, and the track structure 30 is buried at the top of the ballast 11.
Referring to fig. 1, a friction pad having a high friction coefficient is laid and fixed on the top surface of a flat roadbed surface layer 10, frictional resistance between ballast 11 and the roadbed surface layer 10 is enhanced, the ballast 10 is loaded into a small gabion 12 to increase frictional resistance between the ballast, and through interaction of a friction bar 15 and the roadbed surface layer 10, overall stability and anti-slip capability of the ballast are greatly enhanced, and safety of a high-gradient toothed rail railway is ensured. The high side walls of the drainage ditches 20 on the two sides of the roadbed play a role in blocking the ballast 11, so that the ballast 11 is prevented from being unstable in the transverse direction of the roadbed, the width of a roadbed surface is reduced, the land is saved, the cutting amount is reduced, and the engineering economy is good.
Referring to fig. 1, the friction pad 13 is made of a geotechnical material having a high friction coefficient, and has durability satisfying design requirements. The top surface of the roadbed surface layer 10 is provided with a drainage gradient of not less than 4% from the center of the roadbed to two sides; the high side walls of the drainage ditches 20 on the two sides are provided with drainage holes 21 at intervals of 1.0-2.0m along the line direction, the inner ports of the drainage holes 21 correspond to the elevation positions of the top surface part of the roadbed surface layer 10, and the infiltration water can be discharged through the drainage holes 21 on the high side walls. The roadbed surface layer 10 is doped with 3 weight percent of cement in the filler with the width of 0.2-0.5m close to the high side wall side of the drainage ditch 20, thereby being beneficial to filling and compacting effects and reducing water infiltration.
Referring to fig. 2 and 3, the friction pad 13 is exposed at the upper portion of the friction bar 15, and the small gabion 12 is fixedly connected with the exposed section of the friction bar 15 in a binding manner. Generally, the mini-gabion 12 is preferably provided in two layers, wherein the top surface of the lower mini-gabion 12 is located at the bottom elevation of the track structure 30.
Referring to fig. 1, another technical problem to be solved by the present invention is to provide a method for constructing a cutting rack railway reinforced track bed structure, which comprises the following steps:
(1) cutting is excavated in layers, and slope protection is performed timely until the top elevation of the roadbed surface layer 10 is reached;
(2) digging foundation pits of the drainage ditches 20 on two sides, constructing the drainage ditches 20 in time, and reserving drain holes 21 on high side walls of the drainage ditches 20;
(3) after the concrete of the drainage ditches 20 reaches 75% of the design strength, excavating foundation pits between the drainage ditches 20 at two sides;
(4) filling roadbed surface layer 10 in a foundation pit layer by layer, and adding 3% cement by weight into roadbed surface layer filling materials with the width ranging from 0.2 m to 0.5m close to the high side wall side of the drainage ditch 20;
(5) a friction pad 13 is paved on the top surface of the roadbed surface layer 10 and is tensioned and straightened;
(6) staples 14 are inserted at intervals on the friction pad 13, and the lower parts of the staples 14 penetrate through the friction pad 13 and are fixed in the foundation bed surface layer 10;
(7) driving friction bars 15 through the friction pads 13 into the roadbed surface layer 10;
(8) a small gabion cage 12 is arranged on the friction pad 13, and the small gabion cage 12 is fixedly connected with the exposed section of the friction bar 15 in a binding way;
(9) ballast 11 is filled in the small gabion 12 and vibrated to compact the ballast to the elevation of the bottom of the track structure 30;
is placed on top of the ballast 12 in a track structure 30, and the remaining ballast 12 is paved between the track structures 30 and vibrated to compact.
The construction method is simple to operate, easy to control the quality, beneficial to saving engineering investment and capable of being popularized and applied on a large scale.
The foregoing is provided by way of illustration of the principles of an enhanced ballast bed structure and method of constructing a cutting rack railway of the present invention, and is not intended to limit the invention to the specific structure and method of construction shown and described, but rather to limit the invention to all modifications and equivalents thereof which may be employed, and fall within the scope of the invention as defined in the appended claims.
Claims (1)
1. The construction method of the cutting rack railway reinforced ballast bed structure comprises drainage ditches (20) arranged on two lateral sides of a roadbed, roadbed surface layers (10) filled between inner side walls of the drainage ditches (20) on two sides, and ballasts (11) filled on the roadbed surface layers (10), wherein the track structures (30) are buried at the tops of the ballasts (11), the drainage ditches (20) are reinforced concrete special-height side wall structures, the inner side walls of the drainage ditches vertically extend upwards to form high side walls, the roadbed surface layers (10) are filled between the two high side walls on two sides, friction pads (13) fixed by U-shaped nails (14) are paved on the top surface of the roadbed surface layers (10), and friction bars (15) with the lower parts penetrating through the friction pads (13) of the roadbed surface layers (10) are longitudinally and transversely arranged at intervals; the friction pad (13) is continuously provided with a small gabion (12) fixedly connected with the friction bar (15), the small gabion (12) is filled with ballast (11) and is vibrated compactly, and the track structure (30) is buried at the top of the ballast (11);
the top surface of the roadbed surface layer (10) is provided with a drainage gradient which is not less than 4% from the center of the roadbed to two sides; the high side walls of the drainage ditches (20) on the two sides are provided with drainage holes (21) at intervals of 1.0-2.0m along the line direction, and the inner ports of the drainage holes (21) correspond to the elevation positions of the top surface part of the roadbed surface layer (10);
the roadbed surface layer (10) is adjacent to the filler of the high side wall side of the drainage ditch (20) with the width ranging from 0.2 m to 0.5m, and 3 weight percent of cement is doped into the filler;
the upper part of the friction bar (15) is exposed out of the friction pad (13), and the small gabion (12) is fixedly connected with the exposed section of the friction bar (15) in a binding way;
the small gabion cages (12) are arranged in two layers, wherein the top surface of the lower small gabion cage (12) is positioned at the bottom elevation position of the track structure (30);
the construction method comprises the following steps:
(1) cutting is excavated in a layered mode, and slope protection is timely carried out until the top of the roadbed surface layer (10) is high;
(2) digging foundation pits of drainage ditches (20) on two sides, constructing the drainage ditches (20) in time, and reserving drainage holes (21) on high side walls of the drainage ditches (20);
(3) after the concrete of the drainage ditches (20) reaches 75% of the design strength, excavating foundation pits between the drainage ditches (20) at two sides;
(4) the subgrade surface layer (10) is built in layers in the foundation pit, and 3% of cement by weight is mixed in the subgrade surface layer filling material with the width of 0.2-0.5m close to the high side wall side of the drainage ditch (20);
(5) paving a friction pad (13) on the top surface of the roadbed surface layer (10), and tensioning and straightening;
(6) the U-shaped nails (14) are inserted into the friction pad (13) at intervals, and the lower parts of the U-shaped nails (14) penetrate through the friction pad (13) and are fixed in the foundation bed surface layer (10);
(7) penetrating through the friction pad (13) and driving a friction bar (15) into the roadbed surface layer (10);
(8) a small gabion cage (12) is arranged on the friction pad (13), and the small gabion cage (12) is fixedly connected with the exposed section of the friction bar (15) in a binding way;
(9) the small gabion (12) is filled with ballast (11) and is vibrated and compacted to the elevation of the bottom of the track structure (30);
is placed on top of the ballast (11) in a track structure (30), and the remaining ballast (11) is laid between the track structures (30) and vibrated to compact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910348007.5A CN110055826B (en) | 2019-04-28 | 2019-04-28 | Construction method of cutting rack rail reinforced track bed structure |
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| CN201910348007.5A CN110055826B (en) | 2019-04-28 | 2019-04-28 | Construction method of cutting rack rail reinforced track bed structure |
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| CN110055826A CN110055826A (en) | 2019-07-26 |
| CN110055826B true CN110055826B (en) | 2023-09-22 |
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| CN110055826A (en) | 2019-07-26 |
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