CN106049213A - Control method and structure of non-uniform settlement of highway soft soil roadbed - Google Patents
Control method and structure of non-uniform settlement of highway soft soil roadbed Download PDFInfo
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- CN106049213A CN106049213A CN201610607667.7A CN201610607667A CN106049213A CN 106049213 A CN106049213 A CN 106049213A CN 201610607667 A CN201610607667 A CN 201610607667A CN 106049213 A CN106049213 A CN 106049213A
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- soil
- sash
- reinforced concrete
- bed course
- subgrade
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a control method and structure of non-uniform settlement of a highway soft soil roadbed. The method comprises: (1) piling a cement mixing pile into the highway soft soil roadbed; (2) pouring a steel reinforced concrete framework at the top of the cement mixing pile, wherein the steel reinforced concrete framework is internally provided with frame cells which are arranged in a rectangular array; (3) spreading one layer of geogrids on the steel reinforced concrete framework; (4) fixing one elastic soil guide arch cushion layer with a spherical segment shape on one geogrid above each frame cell, and supporting outer edges of bottom surfaces of the elastic soil guide arch cushion layers on geogrid beams; (5) spreading graded crushed stones on the geogrids and the elastic soil guide arch cushion layers; (6) filling a slag roadbed layer by layer to a designed height. By adopting the control method and structure, the integrity of a stress deformation shape of the newly built slag roadbed filled with a soil and stone mixture can be controlled, and road surface cracks caused by the non-uniform settlement is prevented.
Description
Technical field
The invention belongs to construction method field, be specifically related to a kind of highway soft soil settlement of subgrade control method and
Structure.
Background technology
The soft soil roadbed uneven subsidence of existing highway is the most prominent, and particularly soil stone mixing is filling roadbed, is presented as
Road surface portraitlandscape cracking；But the globality roadbeds such as lime-clay, soil stone mixing roadbed later stage slip casting, road surface portraitlandscape ftractures
Phenomenon is seldom；The key problem of highway soft soil settlement of subgrade controls roadbed force and deformation state globality exactly and asks
Topic.How economical solve along seamount many less, the abundant local new highway roadbed force and deformation state globality of slag of delaying controls to ask
Topic, so that it may avoid road surface portraitlandscape cracking disease repeatedly to go wrong, not only save construction fund but also maintenance fund can be saved.
Summary of the invention
The present invention is directed to the existing newly-built soil stone slag roadbed of delaying that fills of mixing do not use and effectively control roadbed stress deformation
State integrity issues, and the control method of a kind of highway soft soil settlement of subgrade is provided.Thus at roadbed bottom with soft
The controlling measurement such as framework newly-built soil stone is used to mix the slag roadbed force and deformation state globality of delaying filled between soil base top layer,
Avoid road surface portraitlandscape cracking disease problem.
The control method of highway soft soil settlement of subgrade includes:
1) in highway soft soil roadbed, cement mixing pile is set；
2) at cement mixing pile top pouring reinforcement concrete framework, reinforced concrete frame has rectangular array row
The sash of cloth；
3) on reinforced concrete frame, one layer of GSZ is laid；
4) an elastic soil arch bed course that guides in segment shape, and bullet are fixed on the GSZ above each sash
Property guide soil arch bed course outer, bottom surface be supported on sash beam；
5) making graded broken stone on GSZ and elastic guiding soil arch bed course；
6) placement in layers delays slag roadbed to design height.
The core of the present invention is to utilize the effect of soil arch bed course, the soil pressure of roadbed is guided to sash beam, it is to avoid straight
Connect and act on weak soil crust layer, prevent roadbed from producing differential settlement.It is found by the applicant that: by arranging segment-shaped and having one
Fixed elastic soil arch guides bed course (Fig. 4), and roadbed block above bed course or granule have sinking tendency but run into bed course and hinder,
Bed course periphery roadbed can produce top roadbed block or the holding power of granule, and self-assembling formation soil encircles.And elastic guiding native arch pad
The outer, bottom surface of layer is supported on sash beam, and therefore soil arch upper load is transferred to sash joist support load.In reinforced concrete frame
Each sash all assume responsibility for transfer load, therefore reinforced concrete frame will undertake above roadbed as an entirety
The weight of the slag of delaying filled.Thus, roadbed force and deformation state is just provided with globality, it is to avoid because differential settlement is caused
Road surface portraitlandscape cracking disease problem.
It addition, the reinforced concrete frame bottom support of the present invention has cement mixing pile, to alleviate weak soil crust layer
Pressure.In prior art, much setting prefabricated pile or steel-pipe pile, its problem is: can work if being fought to the finish, if
Not fighting to the finish, stake cannot be stablized in weak soil, and then causes differential settlement.The effect of GSZ further functions as support
Effect, uniform load, improves stability.
As preferably, a length of 0-8m of described cement mixing pile.Further, when weak soil crust layer is sufficiently thick
Waiting, can be not provided with stake, a length of 0m of i.e. described cement mixing pile, reinforced concrete frame is directly arranged at soft soil foundation
Crust layer on.Thus, it is possible to reduce cost investment further.
As preferably, described elastic guiding soil arch bed course is centrally located on same vertical line with sash, and elastic guiding
The bottom surface circle of soil arch bed course is tangent with the four of sash beam centrages, i.e. the border of bottom surface circle at least covers the centrage of beam.Should
Under state, adjacent elastic guiding soil arch bed course is the most circumscribed.When shifting load, an entirety completely can be formed,
The most mutually support, the pressure globality of top is transferred on reinforced concrete frame, improves its stability.
As preferably, described reinforced concrete frame casting method is: arrange smooth ground, arranges according to design plane
Excavate and arrange the soil box that shape is identical, cast-in-situ steel reinforced concrete framework in soil box with reinforced concrete frame, and carry out maintenance.
The method can save cost, and easy construction.
As preferably, in described reinforced concrete frame, bottom, each sash summit has all set cement mixing pile, phase
Same pile is shared at the common vertex of adjacent sash.It is possible to improve the stability of reinforced concrete frame entirety stress,
Prevent differential settlement further.
As preferably, described cement mixing pile is 2.0 × 2.0m rectangular array horizontal layout；Described armored concrete
Sash a size of 2.0 × 2.0m in framework, sash deck-molding 0.2m, wide 0.5m；Described elastic guiding soil arch base surface diameter
2m, high 0.3-0.5m.Under this design parameter, it is possible in the case of ensureing that it controls effect, improve the economy of cost,
It is easy to promote the use of.
As preferably, described elastic guiding soil arch course is hard foam.
Another object of the present invention is to provide the control structure of a kind of highway soft soil settlement of subgrade, including reinforcing bar
Concrete frame, GSZ and elastic guiding soil arch bed course；Described reinforced concrete frame has rectangular array row
The sash of cloth, lays one layer of GSZ, the GSZ above each sash is fixed one above reinforced concrete frame
Elastic guiding soil in segment shape encircles bed course, and the elastic outer, bottom surface guiding native arch bed course is supported on sash beam.
As preferably, in described reinforced concrete frame, bottom, each sash summit has all set cement mixing pile, institute
The length of the cement mixing pile stated is preferably 0-8m；As further preferably, described elastic guiding soil encircles bed course and sash
It is centrally located on same vertical line, and the elastic bottom surface guiding soil to encircle bed course circle is tangent with the four of sash beam centrages；Described
The elastic material guiding soil arch bed course is preferably rigid foam.
The control method of the highway soft soil settlement of subgrade of the present invention, between roadbed bottom and soft soil foundation top layer
Use the measure such as framework and elastic guiding soil arch bed course, together form the overall structure of weight above a carrying, it is possible to control
Make newly-built soil stone and mix the slag roadbed force and deformation state globality of delaying filled, prevent because differential settlement causes road surface to occur out
Split.Economy of the present invention solve along seamount many less, the abundant local new highway roadbed force and deformation state globality of slag of delaying controls
Problem, not only saves construction fund but also save maintenance fund.
Accompanying drawing explanation
Fig. 1 is soft subgrade treatment site plan；
Fig. 2 is soft subgrade treatment vertical section layout drawing；
Fig. 3 is soft soil roadbed elastic guiding soil arch bed course elevation；
The load transfer schematic diagram that Fig. 4 is caused by soil arch guiding bed course.
Detailed description of the invention
With detailed description of the invention the present invention it is further elaborated below in conjunction with the accompanying drawings and illustrates.In the present invention, each is implemented
The technical characteristic of mode, on the premise of not colliding with each other, all can carry out respective combination.
As it is shown in figure 1, the control structure of a kind of highway soft soil settlement of subgrade, including reinforced concrete frame, soil
Work grid and elastic guiding soil arch bed course；Described reinforced concrete frame has the sash of rectangular array arrangement, reinforcing bar
Lay one layer of GSZ above concrete frame, the GSZ above each sash is fixed a bullet in segment shape
Property guide soil arch bed course, and the elastic outer, bottom surface guiding soil arch bed course is supported on sash beam.Described steel reinforced concrete frame
In frame, bottom, each sash summit has all set cement mixing pile, and the length of described cement mixing pile is preferably 0-8m.Described
Elastic guide soil arch bed course to be centrally located on same vertical line with sash, and the elastic bottom surface circle guiding soil arch bed course and sash
Four beam centrages tangent；The described elastic material guiding soil arch bed course is preferably rigid foam.Based on this structure
Highway soft soil settlement of subgrade can be controlled.Its construction method includes:
(1) according to characteristics of soft clay and code requirement, arrangeCement mixing pile, length range 0.0～8.0m (cement
The a length of 0m of mixing pile, described reinforced concrete frame is directly arranged on the crust layer of soft soil foundation), horizontal layout in
2.0 × 2.0m rectangular array.
(2) according to roadbed height and related specifications requirement, smooth ground is arranged, according to the horizontal layout requirement of highway, edge
Roadbed bearing of trend excavation has a soil box of sash of rectangular array arrangement, and the deep 20cm of soil box, wide 50cm are cast-in-place in soil box
High 20cm, the sash beam of wide 50cm, sash a size of 2.0 × 2.0m in reinforced concrete frame.Ultimately form every segment length 20m's
Reinforced concrete frame, and maintenance 24 days.Sash is corresponding with cement mixing pile, and bottom, each sash summit has all set cement and stirred
Mix stake.
(3) on reinforced concrete frame, one layer of GSZ is laid；
(4) an elastic soil arch bed course that guides in segment shape is placed on the GSZ above each sash, and
It is fixed with geo-grid sheet.In the present embodiment, guide soil arch base surface diameter 2m, high 0.3-as it is shown on figure 3, elastic
0.5m, material is hard foam.Elastic guiding soil arch bed course is centrally located on same vertical line with sash, and elastic guiding
The bottom surface circle of soil arch bed course is tangent with the four of sash beam centrages, makes the elastic outer, bottom surface guiding soil arch bed course be supported on frame
On lattice beam.
(5) making 50cm graded broken stone on GSZ and elastic guiding soil arch bed course；
(6) according to the every 50cm of code requirement mono-layer, placement in layers delays slag roadbed to design height.
Finally, the control structure of the highway soft soil settlement of subgrade of formation is as illustrated in fig. 1 and 2.
Embodiment described above is the one preferably scheme of the present invention, and so it is not intended to limiting the invention.Have
Close the those of ordinary skill of technical field, without departing from the spirit and scope of the present invention, it is also possible to make various change
Change and modification.The technical scheme that the most all modes taking equivalent or equivalent transformation are obtained, all falls within the guarantor of the present invention
In the range of protecting.
Claims (10)
1. the control method of a highway soft soil settlement of subgrade, it is characterised in that including:
1) in highway soft soil roadbed, cement mixing pile is set；
2) at cement mixing pile top pouring reinforcement concrete framework, reinforced concrete frame has rectangular array arrangement
Sash；
3) on reinforced concrete frame, one layer of GSZ is laid；
4) fix an elastic guiding soil arch bed course in segment shape on the GSZ above each sash, and elasticity is drawn
The outer, bottom surface leading soil arch bed course is supported on sash beam；
5) making graded broken stone on GSZ and elastic guiding soil arch bed course；
6) placement in layers delays slag roadbed to design height.
2. the control method of highway soft soil settlement of subgrade as claimed in claim 1, it is characterised in that described cement
The a length of 0-8m of mixing pile.
3. the control method of highway soft soil settlement of subgrade as claimed in claim 2, it is characterised in that described cement
The a length of 0m of mixing pile, described reinforced concrete frame is directly arranged on the crust layer of soft soil foundation.
4. the control method of highway soft soil settlement of subgrade as claimed in claim 1, it is characterised in that described elasticity
Soil arch bed course and sash is guided to be centrally located on same vertical line, and four of the elastic bottom surface circle guiding soil arch bed course and sash
Beam centrage is tangent.
5. the control method of highway soft soil settlement of subgrade as claimed in claim 1, it is characterised in that described reinforcing bar
Concrete frame casting method is: arrange smooth ground, arranges that excavation arranges shape with reinforced concrete frame according to design plane
The soil box that shape is identical, cast-in-situ steel reinforced concrete framework in soil box, and carry out maintenance.
6. the control method of highway soft soil settlement of subgrade as claimed in claim 1, it is characterised in that described reinforcing bar
In concrete frame, bottom, each sash summit has all set cement mixing pile.
7. the control method of highway soft soil settlement of subgrade as claimed in claim 1, it is characterised in that described cement
Mixing pile is 2.0 × 2.0m rectangular array horizontal layout；Sash a size of 2.0 × 2.0m in described reinforced concrete frame,
Sash deck-molding 0.2m, wide 0.5m；Described elastic guiding soil arch base surface diameter 2m, high 0.3-0.5m.
8. the control method of highway soft soil settlement of subgrade as claimed in claim 1, it is characterised in that described elasticity
Guiding soil arch course is hard foam.
9. the control structure of a highway soft soil settlement of subgrade, it is characterised in that include reinforced concrete frame, geotechnique
Grid and elastic guiding soil arch bed course；Having the sash of rectangular array arrangement in described reinforced concrete frame, reinforcing bar mixes
Lay one layer of GSZ above solidifying soil framework, the GSZ above each sash is fixed the elasticity in segment shape
Guide soil arch bed course, and the elastic outer, bottom surface guiding soil arch bed course is supported on sash beam.
10. the control structure of highway soft soil settlement of subgrade as claimed in claim 9, it is characterised in that described steel
In reinforced concrete framework, bottom, each sash summit has all set cement mixing pile, and the length of described cement mixing pile is preferably
0-8m；Preferably, described elastic guiding soil arch bed course is centrally located on same vertical line with sash, and elastic guiding soil arch pad
The bottom surface circle of layer is tangent with the four of sash beam centrages；The described elastic material guiding soil arch bed course is preferably rigid foam
Plastics.
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| CN201610607667.7A CN106049213B (en) | 2016-07-27 | 2016-07-27 | A kind of control method and structure of highway soft soil settlement of subgrade |
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| CN201610607667.7A CN106049213B (en) | 2016-07-27 | 2016-07-27 | A kind of control method and structure of highway soft soil settlement of subgrade |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108316292A (en) * | 2018-02-08 | 2018-07-24 | 中交第二航务工程局有限公司 | A kind of cement mixing pile pile group construction method |
| CN109355992A (en) * | 2018-10-16 | 2019-02-19 | 中铁二院工程集团有限责任公司 | A kind of karst region is anti-to collapse road structure and construction method suddenly |
| CN109667207A (en) * | 2017-10-16 | 2019-04-23 | 成都隶盈科技有限公司 | A kind of construction method in mud-rock flow soft base upper berth pad road |
| CN109853313A (en) * | 2019-01-17 | 2019-06-07 | 浙江绿艺园林工程有限公司 | Pile foundation side soft soil foundation road eliminates frictional resistance structure and construction method |
| CN109958016A (en) * | 2017-12-22 | 2019-07-02 | 张远凤 | A kind of extremely frigid zones marshland roadbed anti-sedimentation structure |
| CN110485230A (en) * | 2019-09-17 | 2019-11-22 | 招商局重庆交通科研设计院有限公司 | A kind for the treatment of structures and construction method of high water level weak soil Bridgehead by Blastig |
| CN115305759A (en) * | 2022-08-08 | 2022-11-08 | 中国十七冶集团有限公司 | Road foundation protection system for deep soft foundation and construction method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10317307A (en) * | 1997-05-19 | 1998-12-02 | Dia Consultant:Kk | Construction method for road |
| JPH11269860A (en) * | 1998-03-26 | 1999-10-05 | Shimizu Corp | Composite improvement ground structure |
| CN1609343A (en) * | 2004-08-06 | 2005-04-27 | 陶钧炳 | Structure of king crab type light dyke-dam and method |
| KR100796003B1 (en) * | 2007-03-21 | 2008-01-21 | (주)삼주건설기술단 | Road structure pressing for drainage |
| CN102605699A (en) * | 2012-03-23 | 2012-07-25 | 河海大学 | Technology for settlement control of hollow rigid plate after construction of deep soft soil foundation of high-level embankment |
| CN103821160A (en) * | 2014-01-28 | 2014-05-28 | 中铁二院工程集团有限责任公司 | Soft soil foundation combined pile net structure |
-
2016
- 2016-07-27 CN CN201610607667.7A patent/CN106049213B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10317307A (en) * | 1997-05-19 | 1998-12-02 | Dia Consultant:Kk | Construction method for road |
| JPH11269860A (en) * | 1998-03-26 | 1999-10-05 | Shimizu Corp | Composite improvement ground structure |
| CN1609343A (en) * | 2004-08-06 | 2005-04-27 | 陶钧炳 | Structure of king crab type light dyke-dam and method |
| KR100796003B1 (en) * | 2007-03-21 | 2008-01-21 | (주)삼주건설기술단 | Road structure pressing for drainage |
| CN102605699A (en) * | 2012-03-23 | 2012-07-25 | 河海大学 | Technology for settlement control of hollow rigid plate after construction of deep soft soil foundation of high-level embankment |
| CN103821160A (en) * | 2014-01-28 | 2014-05-28 | 中铁二院工程集团有限责任公司 | Soft soil foundation combined pile net structure |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109667207A (en) * | 2017-10-16 | 2019-04-23 | 成都隶盈科技有限公司 | A kind of construction method in mud-rock flow soft base upper berth pad road |
| CN109667207B (en) * | 2017-10-16 | 2021-04-02 | 广东建咨工程管理有限公司 | Construction method for paving road on debris flow soft foundation |
| CN109958016A (en) * | 2017-12-22 | 2019-07-02 | 张远凤 | A kind of extremely frigid zones marshland roadbed anti-sedimentation structure |
| CN108316292A (en) * | 2018-02-08 | 2018-07-24 | 中交第二航务工程局有限公司 | A kind of cement mixing pile pile group construction method |
| CN108316292B (en) * | 2018-02-08 | 2020-02-07 | 中交第二航务工程局有限公司 | Construction method for cement mixing pile group |
| CN109355992A (en) * | 2018-10-16 | 2019-02-19 | 中铁二院工程集团有限责任公司 | A kind of karst region is anti-to collapse road structure and construction method suddenly |
| CN109355992B (en) * | 2018-10-16 | 2024-01-23 | 中铁二院工程集团有限责任公司 | Karst area sudden collapse prevention roadbed structure and construction method |
| CN109853313A (en) * | 2019-01-17 | 2019-06-07 | 浙江绿艺园林工程有限公司 | Pile foundation side soft soil foundation road eliminates frictional resistance structure and construction method |
| CN109853313B (en) * | 2019-01-17 | 2024-04-30 | 浙江绿艺建设有限公司 | Pile foundation side soft soil foundation road friction resistance eliminating structure and construction method |
| CN110485230A (en) * | 2019-09-17 | 2019-11-22 | 招商局重庆交通科研设计院有限公司 | A kind for the treatment of structures and construction method of high water level weak soil Bridgehead by Blastig |
| CN110485230B (en) * | 2019-09-17 | 2024-04-02 | 招商局重庆交通科研设计院有限公司 | Treatment structure and construction method of high-water-level soft soil bridge head roadbed |
| CN115305759A (en) * | 2022-08-08 | 2022-11-08 | 中国十七冶集团有限公司 | Road foundation protection system for deep soft foundation and construction method thereof |
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|---|---|
| CN106049213B (en) | 2018-03-20 |
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