CN107460790B - Ballastless track railway expanded rock cutting structure and construction method - Google Patents
Ballastless track railway expanded rock cutting structure and construction method Download PDFInfo
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- CN107460790B CN107460790B CN201710603423.6A CN201710603423A CN107460790B CN 107460790 B CN107460790 B CN 107460790B CN 201710603423 A CN201710603423 A CN 201710603423A CN 107460790 B CN107460790 B CN 107460790B
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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
- E01B2/00—General structure of permanent way
- E01B2/006—Deep foundation of tracks
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- Engineering & Computer Science (AREA)
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- Structural Engineering (AREA)
- Railway Tracks (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
The utility model provides a ballastless track railway expansion rock cutting structure and construction method to effectively avoid high-speed ballastless track railway to take place to arch deformation through expansion rock cutting, satisfy the requirement of high-speed ballastless track to the circuit smoothness. It comprises the following steps: pressure relief holes are arranged in the expanded rock foundation in the depth range affected by the atmosphere at intervals; the anchor segments of the pre-stress anchor cables are positioned in the expanded rock foundation below the depth range affected by the atmosphere, and the anchor pull plates are arranged on the expanded rock foundation and are fixedly connected with the pre-stress anchor cables in a tensioning manner; the foundation bed bottom layer and the foundation bed surface layer are filled on the anchor pulling plate in a layered manner, and the foundation bed surface layer is filled on the foundation bed bottom layer; and the drainage side ditches are arranged on two sides of the cutting structure, and the bottoms of the drainage side ditches are provided with longitudinal blind ditches.
Description
Technical Field
The invention relates to geotechnical engineering, in particular to an expansion-resistant arch-up structure for high-speed ballastless track railway expansion rock cutting engineering and a construction method.
Background
The deformation control of the high-speed railway, particularly the ballastless track railway, is very strict, and the problem of lower settlement deformation is solved in the conventional high-speed railway roadbed, but when the high-speed railway roadbed passes through an expanded rock foundation in a cutting mode, the expanded rock foundation generates upward expansion force when water content is increased, so that the ballastless track of the high-speed railway is subjected to arch deformation, the operation safety of the high-speed railway is seriously influenced when the arch deformation is large, and the arch deformation is difficult to repair and take effective measures under the current technical conditions. Therefore, there is an urgent need for a ballastless track railway expanded rock cutting structure to solve the existing problems, and the ballastless track railway expanded rock cutting structure should have the characteristics of economy, convenience in construction, safety, environmental protection and the like.
Disclosure of Invention
The invention aims to provide an expanded rock cutting structure of a ballastless track railway, so as to effectively avoid the upward arch deformation of the high-speed ballastless track railway through the expanded rock cutting and meet the requirement of the high-speed ballastless track on the smoothness of the line.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention relates to a ballastless track railway expanded rock cutting structure, which is characterized by comprising the following components: pressure relief holes are arranged in the expanded rock foundation in the depth range affected by the atmosphere at intervals; the anchor segments of the pre-stress anchor cables are positioned in the expanded rock foundation below the depth range affected by the atmosphere, and the anchor pull plates are arranged on the expanded rock foundation and are fixedly connected with the pre-stress anchor cables in a tensioning manner; the foundation bed bottom layer and the foundation bed surface layer are filled on the anchor pulling plate in a layered manner, and the foundation bed surface layer is filled on the foundation bed bottom layer; and the drainage side ditches are arranged on two sides of the cutting structure, and the bottoms of the drainage side ditches are provided with longitudinal blind ditches.
The invention provides a construction method of an expanded rock cutting structure of a ballastless track railway, which comprises the following steps: (1) grading excavation of cut slopes and timely reinforcement and protection are carried out on the cut slopes until the cut slopes reach the set anchor plate elevation; (2) constructing a longitudinal blind drain; (3) constructing a drainage side ditch; (4) drilling and constructing a prestressed anchor cable on an expanded rock foundation, and performing high-pressure grouting to form a prestressed anchor cable reinforcing structure; (5) drilling a pressure relief hole in the expanded rock foundation, and spraying foam glue into the hole; (6) binding anchor plate steel bars in sections, tensioning the prestressed anchor cables in the sections, and fixedly connecting the prestressed anchor cables with anchor plate main steel bars by adopting connecting steel bars; (7) pouring sectional anchor plate concrete; (8) repeating the steps (1) to (7) until all the anchor pull plate concrete pouring is completed; (9) after the anchor plate concrete meets the strength requirement, filling the bottom layer of the foundation bed in layers; filling the surface layer of the foundation bed.
The invention has the beneficial effects that the prestressed anchor cables which are arranged at intervals are used for resisting the expansion force of the expansion rock, and the pressure relief holes are arranged for generating the expansion force for the expansion rock and providing deformation space when the upward deformation is limited, so that the upward arch deformation of the high-speed ballastless track railway through the cutting of the expansion rock is effectively avoided, and the requirement of the high-speed ballastless track on the smoothness of the line is met; the construction is simple, the engineering investment is low, the popularization and application prospect is achieved, and the environment-friendly requirement is met.
Drawings
The specification includes the following drawings:
FIG. 1 is a schematic cross-sectional view of an expanded rock cutting structure of a ballastless track railway of the present invention.
The component names and corresponding labels are shown: the device comprises a prestressed anchor cable 1, a pressure relief hole 2, an anchor plate 3, a foundation bed bottom layer 4, a foundation bed surface layer 5, a drainage side ditch 6, a longitudinal blind ditch 7, a cutting slope A and an atmospheric influence depth h.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
referring to fig. 1, the ballastless track railway expanded rock cutting structure of the present invention includes: pressure relief holes 2 arranged at intervals in the expanded rock foundation within the depth h affected by the atmosphere; the pre-stress anchor cables 1 and the anchor pulling plates 3 are arranged in rows at intervals in the expanded rock foundation, the anchoring sections of the pre-stress anchor cables 1 are positioned in the expanded rock foundation below the depth h range affected by the atmosphere, and the anchor pulling plates 3 are arranged on the expanded rock foundation and are fixedly connected with the pre-stress anchor cables 1 in a tensioning manner; a bed bottom layer 4 and a bed surface layer 5, wherein the bed bottom layer 4 is filled on the anchor plate 3 in a layered manner, and the bed surface layer 5 is filled on the bed bottom layer 4; and the drainage side ditches 6 are arranged on two sides of the cutting structure, and a longitudinal blind ditch 7 is arranged at the bottom of each drainage side ditch 6.
Referring to fig. 1, spaced pre-stressed anchor lines 1 are used to resist the expansive force of expansive rock, thereby avoiding the occurrence of arching deformation of the subgrade. The pressure relief holes 2 are formed in the expanded rock foundation within the range of the depth h affected by the atmosphere, so that expansion force is generated for the expanded rock, deformation space is provided when upward deformation is limited, the expansion force is effectively released, the arch-up acting force on the prestressed anchor cable 1 and the anchor pull plate 3 is reduced, and the arch-up deformation cannot be generated on the upper roadbed. Foam rubber is fully sprayed in the pressure relief holes 2, so that groundwater can be prevented from entering the pressure relief holes 2, and the foam rubber has the functions of large deformation, resilience and the like. The anchor plate 3 is used as an upper stressed supporting structure of the prestressed anchor cable 1, and meanwhile, the anchor plate has a larger contact area with an expanded rock-soil foundation, so that the roadbed structure at the upper part of the roadbed has a better deformation coordination function, and the non-uniformity of the bearing capacity of the foundation caused by the arrangement of the pressure relief holes 2 is avoided. The foundation bed bottom layer 4 and the foundation bed surface layer 5 act as a stressed support structure for the upper track structure, while its own weight can resist a part of the expanding arching force. The drainage side ditches 6 drain surface water rapidly, reducing the impact on the expanded rock foundation. The vertical blind drain 7 discharges shallow groundwater, and reduces the expansion force of the expanded rock. The structure effectively solves the problem that the high-speed ballastless track railway is subjected to arch deformation through the expanded rock cutting, has the characteristics of simple construction, low engineering investment and the like, has popularization and application prospects, and meets the requirement of environmental protection.
The arrangement space of the prestressed anchor cable 1 and the length of the anchoring section are calculated and determined according to the expansion force. The pressure relief holes 2 are formed by adopting a geological drilling machine, the distance is 1-2m, the aperture is 40-50mm, the setting depth is generally the depth of the expanded rock severely affected by the atmosphere, and foam rubber is fully sprayed in the holes. The anchor pulling plate 3 can be in a reinforced concrete structure, and the main reinforcement of the anchor pulling plate is fixedly connected with the top of the prestressed anchor cable 1 in a stretching manner. The foundation bed bottom layer 4 is generally 1.0-1.5m thick and is filled by A, B groups of fillers. The thickness of the foundation bed surface layer 5 is generally 0.4m, and graded broken stone is adopted for filling.
Referring to fig. 1, the construction method for the expansive rock cutting structure of the ballastless track railway comprises the following steps:
(1) the cutting slope A is excavated in a grading manner and is reinforced and protected in time until reaching the elevation of the anchor pulling plate 3;
(2) constructing a longitudinal blind drain 7;
(3) constructing a drainage side ditch 6;
(4) drilling and constructing a prestressed anchor cable 1 on an expanded rock foundation, and performing high-pressure grouting to form a reinforced structure of the prestressed anchor cable 1;
(5) drilling a pressure relief hole 2 in an expanded rock foundation, and spraying foam glue into the hole;
(6) binding steel bars of the anchor pulling plate 3 in a segmented manner, tensioning the prestressed anchor cable 1 in the segmented manner, and fixedly connecting the prestressed anchor cable 1 with main bars of the anchor pulling plate 3 by adopting connecting steel bars;
(7) pouring the concrete of the segmented anchor plate 3;
(8) repeating the steps (1) to (7) until all the concrete pouring of the anchor pull plates 3 is completed;
(9) after the concrete of the anchor plate 3 meets the strength requirement, filling the foundation bed bottom layer 4 in layers;
a bed surface layer 5 is filled.
The foregoing is provided by way of illustration of the principles of an expanded rock cutting structure and method of construction of a ballastless track 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 the extent that all such modifications and equivalents may be employed, are intended to fall within the scope of the invention.
Claims (6)
1. The utility model provides a ballastless track railway expanded rock cutting structure which characterized in that it includes: pressure relief holes (2) arranged at intervals in the expanded rock foundation within the range of the depth (h) affected by the atmosphere; the pre-stressed anchor cables (1) and anchor pulling plates (3), wherein the pre-stressed anchor cables (1) are arranged in an expanded rock foundation at intervals in rows, the anchoring sections of the pre-stressed anchor cables are positioned in the expanded rock foundation below the depth (h) range affected by the atmosphere, and the anchor pulling plates (3) are arranged on the expanded rock foundation and are fixedly connected with the pre-stressed anchor cables (1) in a tensioning manner; the foundation bed comprises a foundation bed bottom layer (4) and a foundation bed surface layer (5), wherein the foundation bed bottom layer (4) is filled on the anchor pull plate (3) in a layered manner, and the foundation bed surface layer (5) is filled on the foundation bed bottom layer (4); and the drainage side ditches (6) are arranged on two sides of the cutting structure, and a longitudinal blind ditch (7) is arranged at the bottom of each drainage side ditch (6).
2. The ballastless track railway expanded rock cutting structure of claim 1, wherein: the pressure relief holes (2) are formed by adopting a geological drilling machine, the spacing is 1-2m, the aperture is 40-50mm, the setting depth is the depth of the expanded rock severely affected by the atmosphere, and foam rubber is fully sprayed in the holes.
3. The ballastless track railway expanded rock cutting structure of claim 1, wherein: the anchor pulling plate (3) adopts a reinforced concrete structure, and a main rib of the anchor pulling plate is fixedly connected with the top of the prestressed anchor cable (1) in a stretching manner.
4. The ballastless track railway expanded rock cutting structure of claim 1, wherein: the thickness of the foundation bed bottom layer (4) is 1.0-1.5m, and A, B groups of fillers are adopted for filling.
5. The ballastless track railway expanded rock cutting structure of claim 1, wherein: the thickness of the foundation bed surface layer (5) is 0.4m, and graded broken stone is adopted for filling.
6. A construction method of an expanded rock cutting structure of a ballastless track railway according to any one of claims 1 to 5, comprising the steps of:
(1) the cutting slope (A) is excavated in a grading manner and is reinforced and protected in time until reaching the elevation of the anchor pulling plate (3);
(2) constructing a longitudinal blind drain (7);
(3) constructing a drainage side ditch (6);
(4) drilling and constructing a prestressed anchor cable (1) on an expanded rock foundation, and performing high-pressure grouting to form a reinforced structure of the prestressed anchor cable (1);
(5) drilling a pressure relief hole (2) in an expanded rock foundation, and spraying foam glue into the hole;
(6) the steel bars of the anchor pulling plate (3) are bound in a segmented mode, the prestressed anchor cable (1) in the segmented mode is tensioned, and the prestressed anchor cable (1) is fixedly connected with the main bars of the anchor pulling plate (3) through connecting steel bars;
(7) pouring the concrete of the segmented anchor plate (3);
(8) repeating the steps (1) to (7) until the concreting of all the anchor pull plates (3) is completed;
(9) after the concrete of the anchor plate (3) meets the strength requirement, filling the foundation bed bottom layer (4) in a layered manner;
filling the foundation bed surface layer (5).
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| CN107460790B true CN107460790B (en) | 2023-07-18 |
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| CN108842523A (en) * | 2018-05-11 | 2018-11-20 | 中铁二院工程集团有限责任公司 | In-strong expansive rock or expansive soils ballastless track of high-speed railway foundation stabilization construction and construction method |
| CN110565451B (en) * | 2018-06-05 | 2022-09-16 | 中铁二院工程集团有限责任公司 | Repairing construction method for deformation of upper arch of ballastless track high-speed railway |
| CN108867200B (en) * | 2018-06-05 | 2023-07-18 | 中铁二院工程集团有限责任公司 | Anti-bulge rock cutting structure of high-speed railway and design method |
| CN111274647B (en) * | 2020-03-19 | 2023-07-25 | 中铁二院工程集团有限责任公司 | Gravity balance anti-arching structure for expansive soil cutting of high-speed railway and design method |
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