CN204982556U - Wide roadbed structure of railway light soil group - Google Patents
Wide roadbed structure of railway light soil group Download PDFInfo
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- CN204982556U CN204982556U CN201520439997.0U CN201520439997U CN204982556U CN 204982556 U CN204982556 U CN 204982556U CN 201520439997 U CN201520439997 U CN 201520439997U CN 204982556 U CN204982556 U CN 204982556U
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Abstract
The utility model provides a wide roadbed structure of railway light soil group, including existing railway side slope and the wide embankment that fills of newly -built group, the light soil layer has been built with newly -built group wide filling to existing railway side slope between the embankment, light soil layer and the wide inside geogrid that is provided with of embankment that fills of newly -built group, and the wide way levee crown face that fills of existing railway side slope, light soil layer and newly -built group is by lower supreme foundation bed bottom and the foundation bed top layer of having laid in proper order. The utility model discloses the filler load is helped to effective the reduction, keeps the stability of existing embankment, reduces subsiding of ew line ground and subsides with the additional of existing line.
Description
Technical field
The invention belongs to construction of railways technical field, be specifically related to a kind of railway light soil side broad way based structures.
Background technology
Railway increase build two wires or new line with both wired parallel when, for saving the area or for interconnect with both wired, the project situation of existing subgrade widen inevitably occurring.Conventional Existing Railway Line helps wide technology, mainly comprises the following aspects:
1. basement process: process newly-built circuit ground, enables bearing capacity of foundation soil and sedimentation meet the requirement of newly-built circuit, reduces as far as possible and both wired relative settlement simultaneously.
2. both wired side is filled out: dig step in both wired side slopes, then placement in layers meets the filler of subgrade bed and following embankment part.
The method can meet general subgrade and widen demand, but in some cases, also can produce some problems.
1. general fast railway
When embankment raising is higher or ground is weak, the load of the wide generation of conventional side may cause foundation instability, causes roadbed to destroy, therefore must process ground.Both wired side wide general employing pile foundation process, as agitation pile, rotary churning pile, CFG stake, drilled pile etc.These treatment measures, are applicable to different foundation conditions, but have respective shortcoming.Agitation pile, CFG pile driving construction equipment are very large, need sufficient construction plant; Jet grouting pile construction may cause the horizontal movement of existing roadbed; Drilled pile construction can produce a large amount of mud emissions.Some place, affects by construction plant restriction or other external factor, and pile foundation construction difficulty is very large or create considerable influence to both wired operations, needs the engineering measure taking other.
2. high-speed railway
Current China Express Railway runs mileage more than 1.6 ten thousand kilometers, with " four vertical four is horizontal " for the High-speed Railway Network of skeleton basically forms.High-speed railway newly-built from now on, inter-city passenger rail, how being connected with existing high ferro network is a huge technical barrier.Because high-speed railway grade is high, Rail inspection control criterion is extremely strict, the small sedimentation of roadbed and horizontal movement all will badly influence the safety of operating line.At present, the operating line sedimentation caused due to the other large-area load of circuit and horizontal movement happen occasionally, and badly influence the safety of high-speed railway operation, the cost of having to cost a lot of money is renovated.
When newly-built high-speed railway, intercity circuit are connected with existing high-speed railway, the inevitable wide problem of side that existing high-speed railway subgrade occurs.Conventional subgrade widen bankets, and can produce larger imposed load, once mishandling, be easy to the additional settlement causing existing roadbed to existing railway roadbed.
Summary of the invention
Object of the present invention is exactly the defect for prior art, provides a kind of railway light soil to help broad way based structures, reduces side filler load, keep the stability of existing embankment, reduce the sedimentation of new line ground and both wired additional settlement.
The invention provides a kind of railway light soil side broad way based structures, comprise the wide railway embankment using of existing railway side slope and newly-built side, lightweight soil layer has been built between the wide railway embankment using of existing railway side slope and newly-built side, the wide railway embankment using inside of lightweight soil layer and newly-built side is provided with geo-grid, and the wide railway embankment using end face of existing railway side slope, lightweight soil layer and newly-built side is equipped with bottom layer of subgrade and surface layer of subgrade bed from the bottom to top successively.The contact surface of lightweight soil layer and railway embankment using is stepped, and the contact surface of railway slope and lightweight soil layer is stepped.
Steel mesh reinforcement is equipped with along short transverse interval in described lightweight soil layer.
Galvanized metal net and anti-seepage geomembrane is equipped with between described lightweight soil layer end face and bottom layer of subgrade bottom surface.
Described adjacent steel mesh reinforcement be spaced apart 3-6m, the bar diameter of described steel mesh reinforcement is 6 ~ 10mm, and rebar spacing is 100 ~ 200mm.
The unit weight of described lightweight soil layer is 7 ~ 10kN/m3, and the compressive strength of lightweight soil layer is 0.8 ~ 1.5MPa.
One end of described geo-grid is embedded in the wide railway embankment using of newly-built side, and the other end of geo-grid is embedded in lightweight soil layer, and geo-grid tensile strength is not less than 25kN/m2.
Described lightweight soil layer is provided with shrinkage joint along circuit longitudinal separation, and the spacing of adjacent expansion seam is not more than 30m, is filled with cystosepiment in seam.Greenbelt is equipped with outside the wide railway embankment using of newly-built side.
One end that described geo-grid is embedded in railway embankment using extends to railway embankment using surface.
The present invention utilizes the characteristic that light soil density is little, between the wide railway embankment using of existing railway side slope and newly-built side, arrange lightweight soil layer, greatly can reduce the load helping to fill out roadbed, improves the stability that roadbed is filled out by side, reduces the sedimentation of ground.The railway embankment using that light soil outer wrapping is built by conventional fillers, after carrying out greening protection, can prevent rainwater from immersing light soil inner, make the outward appearance of roadbed and common roadbed be consistent simultaneously, coordinate mutually with surrounding enviroment.The geo-grid of laying between the wide railway embankment using of lightweight soil layer and newly-built side, effectively strengthens the resistance to overturning of embankment structure.Lightweight soil layer, in suitably highly laying steel mesh reinforcement, effectively can strengthen structural strength.Light soil end face lays one deck anticracking galvanized wire mesh and anti-seepage geomembrane, prevents rainwater from invading light soil inner.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is that the present invention constructs schematic diagram a;
Fig. 3 is that the present invention constructs schematic diagram b.
Wherein, 1-existing railway side slope, 2-railway embankment using, 3-lightweight soil layer, 4-geo-grid, 5-steel mesh reinforcement, 6-galvanized metal net and anti-seepage geomembrane, 7-bottom layer of subgrade, 8-surface layer of subgrade bed, 9-formwork supporting plate, 10-step.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, is convenient to be well understood to the present invention, but they do not form restriction to the present invention.
As shown in Figure 1, the invention provides a kind of railway light soil side broad way based structures, comprise the wide railway embankment using 2 of existing railway side slope 1 and newly-built side, between the wide railway embankment using 2 of existing railway side slope 1 and newly-built side, built lightweight soil layer 3.The contact surface of lightweight soil layer and railway embankment using is stepped, and the contact surface of railway slope and lightweight soil layer is stepped.The light soil unit weight that lightweight soil layer 3 adopts is 7 ~ 10kN/m3, and compressive strength is 0.8 ~ 1.5MPa; Its durability is identical with the major project life-span, and not containing harmful and combustible material, avoids environment pollution and hidden fire-fighting danger.Light soil generally adopts light-weight foamed concrete, but is not limited only to light-weight foamed concrete.Existing railway side slope 1 has dug working step 10 with the contact surface of lightweight soil layer 3.Lightweight soil layer 3 and newly-built side wide railway embankment using 2 inside is provided with geo-grid 4, and one end of described geo-grid 4 is embedded in the wide railway embankment using 2 of newly-built side, and the other end of geo-grid 4 is embedded in lightweight soil layer 3.One end that geo-grid 4 is embedded in railway embankment using 2 extends to railway embankment using surface, strengthens the intensity of railway embankment using 2 further.Geo-grid 4 tensile strength is not less than 25kN/m2, strengthens embankment globality.Existing railway side slope 1, lightweight soil layer 3 and newly-built side wide railway embankment using 2 end face are equipped with bottom layer of subgrade 7 and surface layer of subgrade bed 8 from the bottom to top successively.
Anticracking steel mesh reinforcement 5 is equipped with along short transverse interval in described lightweight soil layer 3.Described adjacent steel mesh reinforcement 5 be spaced apart 3-6m, the bar diameter of described steel mesh reinforcement 5 is 6 ~ 10mm, and rebar spacing is 100 ~ 200mm, in order to strengthen the overall construction intensity of lightweight soil layer 3.Be equipped with galvanized metal net and anti-seepage geomembrane 6 between described lightweight soil layer 3 end face and bottom layer of subgrade 7 bottom surface, prevent rainwater from invading light soil inner.
Described lightweight soil layer 3 is provided with shrinkage joint along circuit longitudinal separation, and the spacing of adjacent expansion seam is not more than 30m, is filled with cystosepiment in seam.
As shown in Figure 2,3, work progress of the present invention is as follows:
First remove earth's surface Humus, grade, grinding compacting, carry out basement process when needing as calculated, remove existing side slope protection.
Then both wired side slope first time dug step 10, first floor filled with light-weight soil thickness is highly not less than; Once must not be excavated to top during construction, split in case existing side slope is invaded to bubble open by rainwater, excavated rear formwork supporting plate 9, prepare to build light soil.
Then first floor lightweight soil layer 3, general thickness 0.5 ~ 2m is built; In lightweight soil layer 3, pre-buried geo-grid 4, carries out roadbed filling filling construction.Geo-grid 4 one end is embedded in lightweight soil layer 3, and the other end exposes.Geo-grid 4 tensile strength of geo-grid 4 is not less than 25kN/m
2.
Reach after some strength until light soil, repeat above-mentioned steps, when carrying out follow-up light soil and roadbed filling filling construction, every 3-6m, lay anticracking steel mesh reinforcement 5 at shaping lightweight soil layer 3 end face, strengthen structural strength, wherein bar diameter 6 ~ 10mm, spacing 100 ~ 200mm.After lightweight soil layer 3 entirety has been banketed, lay end face one deck anticracking galvanized wire mesh and anti-seepage geomembrane 6 at it, prevent rainwater from invading light soil inner.
Then railway embankment using 2 outside conventional fillers placement in layers lightweight soil layer is used; Fill in process in answering layering geo-grid 4 pre-buried in lightweight soil layer 3 to be layed in banket, strengthen the resistance to overturning of railway embankment using 2 structure.
Finally fill bottom layer of subgrade 7 and surface layer of subgrade bed 8 at anti-seepage geomembrane 6 top, bottom layer of subgrade 7 thickness is not less than 1m, and surface layer of subgrade bed 8 thickness meets the requirement of relevant railway classification standard.After roadbed has all filled, greening side slope construction can be carried out.
The content that this manual is not described in detail belongs to the known prior art of professional and technical personnel in the field.
Claims (7)
1. a railway light soil side broad way based structures, comprise existing railway side slope (1) and newly-built side wide railway embankment using (2), it is characterized in that having built lightweight soil layer (3) between existing railway side slope (1) and newly-built side wide railway embankment using (2), lightweight soil layer (3) and newly-built side wide railway embankment using (2) inside is provided with geo-grid (4), steel mesh reinforcement (5) is equipped with along short transverse interval in lightweight soil layer (3), existing railway side slope (1), lightweight soil layer (3) and newly-built side wide railway embankment using (2) end face is equipped with bottom layer of subgrade (7) and surface layer of subgrade bed (8) from the bottom to top successively, lightweight soil layer (3) is stepped with the contact surface of railway embankment using (1), existing railway side slope (1) is stepped with the contact surface of lightweight soil layer (3).
2. railway light soil side according to claim 1 broad way based structures, is characterized in that being equipped with galvanized metal net and anti-seepage geomembrane (6) between lightweight soil layer (3) end face and bottom layer of subgrade (7) bottom surface.
3. railway light soil side according to claim 2 broad way based structures, what it is characterized in that adjacent steel mesh reinforcement (5) is spaced apart 3-6m, and the bar diameter of described steel mesh reinforcement (5) is 6 ~ 10mm, and rebar spacing is 100 ~ 200mm.
4. railway light soil side according to claim 1 broad way based structures, is characterized in that the unit weight of lightweight soil layer (3) is 7 ~ 10kN/m
3, the compressive strength of lightweight soil layer (3) is 0.8 ~ 1.5MPa.
5. railway light soil side according to claim 1 broad way based structures, it is characterized in that one end of geo-grid (4) is embedded in the wide railway embankment using of newly-built side (2), the other end of geo-grid (4) is embedded in lightweight soil layer (3), and geo-grid (4) tensile strength is not less than 25kN/m
2.
6. railway light soil side according to claim 1 broad way based structures, is characterized in that the wide railway embankment using of newly-built side (2) outside is equipped with greenbelt.
7. railway light soil according to claim 6 side broad way based structures, is characterized in that one end that geo-grid (4) is embedded in railway embankment using (2) extends to railway embankment using surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520439997.0U CN204982556U (en) | 2015-06-24 | 2015-06-24 | Wide roadbed structure of railway light soil group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520439997.0U CN204982556U (en) | 2015-06-24 | 2015-06-24 | Wide roadbed structure of railway light soil group |
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| CN204982556U true CN204982556U (en) | 2016-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520439997.0U Withdrawn - After Issue CN204982556U (en) | 2015-06-24 | 2015-06-24 | Wide roadbed structure of railway light soil group |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104928996A (en) * | 2015-06-24 | 2015-09-23 | 中铁第四勘察设计院集团有限公司 | Light soil side wide roadbed structure for railway |
| CN110485218A (en) * | 2019-09-11 | 2019-11-22 | 北京铁科特种工程技术有限公司 | It is a kind of to help wide construction method for railway bed |
-
2015
- 2015-06-24 CN CN201520439997.0U patent/CN204982556U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104928996A (en) * | 2015-06-24 | 2015-09-23 | 中铁第四勘察设计院集团有限公司 | Light soil side wide roadbed structure for railway |
| CN104928996B (en) * | 2015-06-24 | 2016-09-21 | 中铁第四勘察设计院集团有限公司 | Railway light soil side broad way based structures |
| CN110485218A (en) * | 2019-09-11 | 2019-11-22 | 北京铁科特种工程技术有限公司 | It is a kind of to help wide construction method for railway bed |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160120 Effective date of abandoning: 20160921 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |