CN110644296A - Anti-bulging structure of ballastless track roadbed expanded rock substrate and construction method - Google Patents
Anti-bulging structure of ballastless track roadbed expanded rock substrate and construction method Download PDFInfo
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- CN110644296A CN110644296A CN201911050731.6A CN201911050731A CN110644296A CN 110644296 A CN110644296 A CN 110644296A CN 201911050731 A CN201911050731 A CN 201911050731A CN 110644296 A CN110644296 A CN 110644296A
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- Prior art keywords
- bottom arch
- arch
- ballastless track
- substrate
- rock
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- 239000011435 rock Substances 0.000 title claims abstract description 57
- 239000000758 substrate Substances 0.000 title claims abstract description 33
- 238000010276 construction Methods 0.000 title claims abstract description 18
- 239000010410 layer Substances 0.000 claims description 42
- 230000002787 reinforcement Effects 0.000 claims description 12
- 239000004746 geotextile Substances 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 7
- 239000004567 concrete Substances 0.000 claims description 6
- 239000011150 reinforced concrete Substances 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 230000002579 anti-swelling effect Effects 0.000 claims description 3
- 238000009412 basement excavation Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- 230000005484 gravity Effects 0.000 abstract description 4
- 230000000452 restraining effect Effects 0.000 abstract description 4
- 101150097977 arch-1 gene Proteins 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Images
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
Abstract
The invention discloses an anti-bulging structure of an expanded rock substrate of a ballastless track subgrade and a construction method. The bottom arch is arranged to restrain the expansion deformation of the substrate, bear the expansion force of the substrate and finally convert the expansion force into thrust in the tangential direction of the two ends of the arch to be balanced with the gravity of the slope, so that the deformation of the upper arch of the expansion rock substrate is prevented, the stability of the expansion rock slope is facilitated, the wing plates are arranged at the two ends of the bottom arch, the contact area with the rock is increased, the two sides can provide larger restraining force, the pressure of the arch end can be diffused, and the pressure stress borne by the rock is reduced.
Description
Technical Field
The invention relates to the field of roadbed engineering, in particular to an anti-bulging structure and a construction method suitable for a deep cutting and expansion rock section ballastless track roadbed expansion rock substrate.
Background
With the rapid development of high-speed railways, expansion rock sections are inevitably subjected to deep cutting in the process of construction. The expanded rock belongs to typical soft rock and has the characteristics of humidifying expansion and unloading rheology. For a ballastless track high-speed railway, in order to ensure the height smoothness of a track surface, the control on the deformation of a roadbed is extremely strict, and the upwarp value is only allowed to be 4mm in terms of the adjustable amount of a track fastener. When the deformation of the upper arch of the expansive rock exceeds the limit value, the operation safety of the high-speed railway is seriously influenced. Therefore, an anti-bulging structure of a roadbed base is urgently needed to solve the problems in ballastless track high-speed railway engineering of deep cutting and expansion rock sections, and the anti-bulging structure has the characteristics of convenience in construction, economy, reasonability, safety, environmental friendliness and the like.
Disclosure of Invention
The invention aims to: in order to solve the problem of deformation of a ballastless track subgrade base of a deep cutting and expansion rock section, the structure can effectively prevent the expansion rock cutting structure from arching and deforming, ensure the stability of an expansion rock slope and meet the requirements of a high-speed railway on smoothness and slope stability.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides an anti-swelling structure of ballastless track subgrade expanded rock basement, is including setting up the bottom arch at cutting excavation basement face, the bottom arch is plate-type structure and downward bending, bottom arch both ends are equipped with the pterygoid lamina that contacts with cutting both sides slope respectively, the pterygoid lamina is perpendicular with bottom arch both ends tangent line to form rigid connection with bottom arch both ends.
The bottom arch is arranged on the substrate, so that the expansion deformation of the substrate is restrained, the expansion force of the substrate is borne, the expansion force is finally converted into the thrust in the tangential direction of two ends of the arch, the thrust is balanced with the gravity of the slope, the upward arch deformation of the expanded rock substrate is prevented, the stability of the expanded rock slope is facilitated, the wing plates are arranged at two ends of the bottom arch, the contact area with the rock is increased, the two sides can provide larger restraining force, the pressure of the arch end can be diffused, and the compressive stress borne by the rock is reduced; the structure can effectively prevent the expansive rock cutting from structurally arching and deforming, guarantees the stability of the expansive rock side slope, meets the requirements of a high-speed railway on smoothness of the line and stability of the side slope, and is novel in structure, simple in construction and wide in application prospect.
As the preferable scheme of the invention, a water-resisting and impervious layer is paved on the top surface of the bottom arch. The waterproof seepage-proof layer has good sealing performance, and blocks the surface seepage water on the top surface of the bottom arch, so that the surface seepage water can be conveniently discharged.
As a preferred scheme of the invention, a drainage blind pipe is arranged above the waterproof impermeable layer, and the drainage blind pipe is longitudinally arranged at the lowest position of the top span of the bottom arch along a line. The drainage blind pipe is beneficial to draining the surface seepage water blocked on the top surface of the bottom arch.
As a preferable scheme of the invention, a reverse filtering layer is arranged outside the drainage blind pipe. The inverted filter layer is arranged outside the drainage blind pipe, so that the drainage blind pipe can be prevented from being blocked and from being lost by fine-grained soil at the bottom layer of the foundation bed.
As a preferable scheme of the invention, the bottom arch and the wing plates on the two sides are of reinforced concrete integral structures.
As a preferred scheme of the invention, the water-resisting and seepage-proofing layer is a composite water-proof and drainage plate.
As a preferable scheme of the invention, the reverse filter layer is made of geotextile and sand gravel.
A construction method of an anti-bulging structure of an expanded rock substrate of a ballastless track subgrade comprises the following steps:
step one, excavating an expansive rock cutting slope in a grading manner and reinforcing the slope until the designed elevation of a roadbed surface is reached;
secondly, excavating a bottom arch groove and wing plate grooves at two sides, and cleaning slag bodies in the grooves;
erecting a construction template, placing a bottom arch and a wing plate reinforcement cage, enabling longitudinal axis reinforcements at two ends of the bottom arch to penetrate into the wing plate reinforcement cage, connecting the bottom arch with main reinforcements of the wing plate by welding, and pouring concrete;
fourthly, after the strength of the concrete reaches 80% of the design strength, paving a waterproof impermeable layer on the top surface of the bottom arch;
fifthly, longitudinally arranging a drainage blind pipe at the lowest position of the bottom arch along a line, and arranging a reverse filter layer outside the drainage blind pipe;
and step six, filling the bottom layer and the surface layer of the foundation bed layer by layers.
According to the invention, through the steps one to six, the bottom arch and the wing plate of the reinforced concrete integral structure are arranged on the base, so that the upwarp deformation of the expansive rock cutting structure can be effectively prevented, the stability of the expansive rock side slope is ensured, the requirements of a high-speed railway on the smoothness of the line and the stability of the side slope are met, and the method has the characteristics of convenience in construction, economy, reasonableness, safety, environmental protection and the like.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the bottom arch is arranged on the substrate, so that the expansion deformation of the substrate is restrained, the expansion force of the substrate is borne, the expansion force is finally converted into the thrust in the tangential direction of two ends of the arch, the thrust is balanced with the gravity of the slope, the upward arch deformation of the expanded rock substrate is prevented, the stability of the expanded rock slope is facilitated, the wing plates are arranged at two ends of the bottom arch, the contact area with the rock is increased, the two sides can provide larger restraining force, the pressure of the arch end can be diffused, and the compressive stress borne by the rock is reduced; the structure can effectively prevent the expansive rock cutting structure from arching and deforming, ensures the stability of the expansive rock side slope, meets the requirements of a high-speed railway on smoothness of a line and stability of the side slope, and has novel structure, simple construction and wide application prospect;
2. the waterproof and impervious layer is laid on the top surface of the bottom arch, and has good sealing performance, so that the surface seepage water is blocked on the top surface of the bottom arch, and the surface seepage water is conveniently discharged;
3. the drainage blind pipe is arranged above the waterproof impermeable layer and is longitudinally arranged at the lowest position of the span of the top surface of the bottom arch along a line, so that the drainage blind pipe is beneficial to draining the ground surface seepage water blocked on the top surface of the bottom arch;
4. through set up the inverted filter outside drainage blind pipe, this inverted filter can prevent the loss of the bed bottom fine grain soil and block up drainage blind pipe.
Drawings
Fig. 1 is a schematic cross-sectional view of an anti-bulging structure of an expanded rock substrate of a ballastless track subgrade in the invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
fig. 3 is a partially enlarged schematic view of fig. 1 at B.
The labels in the figure are: 1-bottom arch, 2-wing plate, 3-drainage blind pipe, 4-water-proof impervious layer, 5-inverted filter layer, 6-prestressed anchor cable, 7-anchor rod and 8-welding point.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The embodiment provides an anti-bulging structure of an expanded rock substrate of a ballastless track subgrade;
as shown in fig. 1-3, the anti-swelling structure of the expanded rock substrate of the ballastless track subgrade in the embodiment includes a bottom arch 1 disposed on the excavation substrate surface of the cutting, the bottom arch 1 is an arc-shaped plate structure and is bent downward, two ends of the bottom arch 1 are respectively provided with a wing plate 2 contacting with the slopes on two sides of the cutting, and the wing plates 2 are perpendicular to the tangent lines of the two ends of the bottom arch 1 and are rigidly connected with the two ends of the bottom arch 1.
The bottom arch is arranged on the substrate, so that the expansion deformation of the substrate is restrained, the expansion force of the substrate is borne, the expansion force is finally converted into the thrust in the tangential direction of two ends of the arch, the thrust is balanced with the gravity of the slope, the upward arch deformation of the expanded rock substrate is prevented, the stability of the expanded rock slope is facilitated, the wing plates are arranged at two ends of the bottom arch, the contact area with the rock is increased, the two sides can provide larger restraining force, the pressure of the arch end can be diffused, and the compressive stress borne by the rock is reduced; the structure can effectively prevent the expansive rock cutting from structurally arching and deforming, guarantees the stability of the expansive rock side slope, meets the requirements of a high-speed railway on smoothness of the line and stability of the side slope, and is novel in structure, simple in construction and wide in application prospect.
In this embodiment, a water-proof impermeable layer 4 is laid on the top surface of the bottom arch 1. The waterproof seepage-proof layer has good sealing performance, and blocks the surface seepage water on the top surface of the bottom arch, so that the surface seepage water can be conveniently discharged.
In this embodiment, be equipped with drainage blind pipe 3 above water proof barrier layer 4, drainage blind pipe 3 is longitudinally arranged along the way and is striden the lowest in the bottom arch 1 top surface, is equipped with a plurality of infiltration holes on drainage blind pipe 3, blocks that the earth's surface infiltration on the bottom arch top surface gets into in the drainage blind pipe through the infiltration hole and discharges away.
In this embodiment, a reverse filtering layer 5 is arranged outside the drainage blind pipe 3. The inverted filter layer is arranged outside the drainage blind pipe, so that the drainage blind pipe can be prevented from being blocked and from being lost by fine-grained soil at the bottom layer of the foundation bed.
In this embodiment, the bottom arch 1 and the two side wing plates 2 are of a reinforced concrete integral structure.
In this embodiment, the water-blocking and impermeable layer 4 is a composite water-proof and drainage plate. The composite waterproof and drainage plate is a composite structure body with drainage and isolation functions, wherein the composite structure body is composed of a three-dimensional geonet core and two sides of the three-dimensional geonet core are both adhered with needle punched and punched geotextiles.
In this embodiment, the reverse filter layer 5 is made of geotextile and sand gravel. Geotextiles, also known as geotextiles, are water permeable geosynthetic materials made from synthetic fibers by needling or weaving. And the surface seepage water enters the drainage blind pipe through the seepage holes after passing through the inverted filter layer formed by the geotextile and the sand gravel.
Example 2
The embodiment provides a construction method of an anti-bulging structure of an expanded rock substrate of a ballastless track subgrade in embodiment 1;
a construction method of an anti-bulging structure of an expanded rock substrate of a ballastless track subgrade comprises the following steps:
step one, excavating expansive rock cutting side slopes in a grading manner and reinforcing the side slopes through a prestressed anchor cable 6 and an anchor rod 7 until the designed elevation of a roadbed surface is reached;
secondly, excavating a bottom arch 1 groove and wing plates 2 grooves at two sides, and cleaning slag bodies in the grooves;
erecting a construction template, placing reinforcement cages of a bottom arch 1 and a wing plate 2, enabling longitudinal axis reinforcements at two ends of the bottom arch 1 to penetrate into the reinforcement cages of the wing plate 2, connecting the bottom arch with main reinforcements of the wing plate by welding (such as a welding point 8), and then pouring concrete;
fourthly, after the strength of the concrete reaches 80% of the design strength, laying a layer of composite waterproof and drainage plate on the top surface of the bottom arch 1 to serve as a waterproof and impermeable layer 4;
fifthly, arranging a drainage blind pipe 3 at the lowest part of the bottom arch 1 along the line longitudinally, and arranging geotextile and sand gravel outside the drainage blind pipe 3 as a reverse filter layer 5;
and step six, filling the bottom layer and the surface layer of the foundation bed layer by layers.
According to the invention, through the steps one to six, the bottom arch and the wing plate of the reinforced concrete integral structure are arranged on the base, so that the upwarp deformation of the expansive rock cutting structure can be effectively prevented, the stability of the expansive rock side slope is ensured, the requirements of a high-speed railway on the smoothness of the line and the stability of the side slope are met, and the method has the characteristics of convenience in construction, economy, reasonableness, safety, environmental protection and the like.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The anti-humping structure of the expanded rock substrate of the ballastless track subgrade is characterized by comprising a bottom arch arranged on a cutting excavation substrate surface, wherein the bottom arch is of a plate structure and is bent downwards, wing plates in contact with slopes on two sides of a cutting are arranged at two ends of the bottom arch respectively, and the wing plates are perpendicular to tangent lines at two ends of the bottom arch and are in rigid connection with two ends of the bottom arch.
2. The anti-humping structure of the expanded rock substrate of the ballastless track subgrade as claimed in claim 1, wherein a water-proof impermeable layer is laid on the top surface of the bottom arch.
3. The anti-rising structure of the expanded rock substrate of the ballastless track subgrade according to the claim 2, characterized in that a drainage blind pipe is arranged above the water-resisting and anti-seepage layer, and the drainage blind pipe is longitudinally arranged at the lowest position in the span of the top surface of the bottom arch along a line.
4. The anti-swelling structure of the expanded rock substrate of the ballastless track subgrade according to claim 3, wherein a reverse filter layer is arranged outside the drainage blind pipe.
5. The anti-humping structure of the expanded rock foundation of the ballastless track subgrade as claimed in claim 4, wherein the bottom arch and the two side wing plates are of reinforced concrete integral structure.
6. The anti-bulging structure of the expanded rock substrate of the ballastless track subgrade according to claim 2, wherein the water-resisting and seepage-proofing layer is a composite waterproof and drainage plate.
7. The ballastless track subgrade expanded rock substrate anti-heave structure of claim 4, wherein the reverse filter layer is geotextile and sand gravel.
8. The construction method of the anti-bulging structure of the ballastless track subgrade expanded rock base according to the claim 5, is characterized by comprising the following steps:
step one, excavating an expansive rock cutting slope in a grading manner and reinforcing the slope until the designed elevation of a roadbed surface is reached;
secondly, excavating a bottom arch groove and wing plate grooves at two sides, and cleaning slag bodies in the grooves;
erecting a construction template, placing a bottom arch and a wing plate reinforcement cage, enabling longitudinal axis reinforcements at two ends of the bottom arch to penetrate into the wing plate reinforcement cage, connecting the bottom arch with main reinforcements of the wing plate by welding, and pouring concrete;
fourthly, after the strength of the concrete reaches 80% of the design strength, paving a waterproof impermeable layer on the top surface of the bottom arch;
fifthly, longitudinally arranging a drainage blind pipe at the lowest position of the bottom arch along a line, and arranging a reverse filter layer outside the drainage blind pipe;
and step six, filling the bottom layer and the surface layer of the foundation bed layer by layers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911050731.6A CN110644296A (en) | 2019-10-31 | 2019-10-31 | Anti-bulging structure of ballastless track roadbed expanded rock substrate and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911050731.6A CN110644296A (en) | 2019-10-31 | 2019-10-31 | Anti-bulging structure of ballastless track roadbed expanded rock substrate and construction method |
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| CN110644296A true CN110644296A (en) | 2020-01-03 |
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| CN201911050731.6A Pending CN110644296A (en) | 2019-10-31 | 2019-10-31 | Anti-bulging structure of ballastless track roadbed expanded rock substrate and construction method |
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|---|---|---|---|---|
| GB9928711D0 (en) * | 1999-12-03 | 2000-02-02 | Keller Ltd | Slope stabilising means |
| CN201137149Y (en) * | 2007-12-21 | 2008-10-22 | 中铁二院工程集团有限责任公司 | Expansive soil cutting slope reinforced structure |
| CN201459739U (en) * | 2009-03-05 | 2010-05-12 | 中铁二院工程集团有限责任公司 | Cutting slope support reinforcing structure |
| CN202509512U (en) * | 2012-03-29 | 2012-10-31 | 中铁第四勘察设计院集团有限公司 | Green protecting structure for deep cutting of high-speed railway |
| CN203320548U (en) * | 2013-05-22 | 2013-12-04 | 中铁二院工程集团有限责任公司 | Embedded type cutting slab-pile wall structure |
| CN204238239U (en) * | 2014-11-17 | 2015-04-01 | 中大建设有限公司 | Pile foundation prestressd anchor cable height wall-retaining structure |
| CN206752483U (en) * | 2017-05-31 | 2017-12-15 | 中铁二院重庆勘察设计研究院有限责任公司 | High-speed railway swelled ground slope chasm structuref |
| 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 |
| CN211057513U (en) * | 2019-10-31 | 2020-07-21 | 中铁二院工程集团有限责任公司 | Anti-rising structure of ballastless track roadbed expansion rock substrate |
-
2019
- 2019-10-31 CN CN201911050731.6A patent/CN110644296A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9928711D0 (en) * | 1999-12-03 | 2000-02-02 | Keller Ltd | Slope stabilising means |
| CN201137149Y (en) * | 2007-12-21 | 2008-10-22 | 中铁二院工程集团有限责任公司 | Expansive soil cutting slope reinforced structure |
| CN201459739U (en) * | 2009-03-05 | 2010-05-12 | 中铁二院工程集团有限责任公司 | Cutting slope support reinforcing structure |
| CN202509512U (en) * | 2012-03-29 | 2012-10-31 | 中铁第四勘察设计院集团有限公司 | Green protecting structure for deep cutting of high-speed railway |
| CN203320548U (en) * | 2013-05-22 | 2013-12-04 | 中铁二院工程集团有限责任公司 | Embedded type cutting slab-pile wall structure |
| CN204238239U (en) * | 2014-11-17 | 2015-04-01 | 中大建设有限公司 | Pile foundation prestressd anchor cable height wall-retaining structure |
| CN206752483U (en) * | 2017-05-31 | 2017-12-15 | 中铁二院重庆勘察设计研究院有限责任公司 | High-speed railway swelled ground slope chasm structuref |
| 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 |
| CN211057513U (en) * | 2019-10-31 | 2020-07-21 | 中铁二院工程集团有限责任公司 | Anti-rising structure of ballastless track roadbed expansion rock substrate |
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