CN207452609U - A kind of hassock layer Foam lightweight soil road structure in deep soft foundation section - Google Patents

A kind of hassock layer Foam lightweight soil road structure in deep soft foundation section Download PDF

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Publication number
CN207452609U
CN207452609U CN201721176175.3U CN201721176175U CN207452609U CN 207452609 U CN207452609 U CN 207452609U CN 201721176175 U CN201721176175 U CN 201721176175U CN 207452609 U CN207452609 U CN 207452609U
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China
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layer
foam lightweight
lightweight soil
hassock
roadbed
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CN201721176175.3U
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Inventor
李永良
杨平
李美霞
尹利华
张留俊
刘耀富
杨德广
黄亚飞
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China Railway Pearl River Delta Investment Development Co Ltd
CCCC First Highway Consultants Co Ltd
Third Engineering Co Ltd of Shanghai Civil Engineering Co Ltd of CREC
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China Railway Pearl River Delta Investment Development Co Ltd
CCCC First Highway Consultants Co Ltd
Third Engineering Co Ltd of Shanghai Civil Engineering Co Ltd of CREC
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Abstract

It is bottom-up including hassock layer, Foam lightweight soil roadbed and supercrust the utility model is related to a kind of hassock layer Foam lightweight soil road structure in deep soft foundation section;Hassock layer is along road longitudinal direction making on deep soft soil foundation;Foam lightweight soil roadbed placement layer by layer is equipped with galvanized wire mesh on hassock layer between the Foam lightweight soil roadbed of every two layers of placement layer by layer;The top surface of Foam lightweight soil roadbed is provided with supercrust;Deformation joint is longitudinally equipped with along Foam lightweight soil roadbed;It plants native bound edge and forms protective layer in Foam lightweight soil roadbed both sides.The utility model have the characteristics that adapt to differential settlement ability it is strong, it is easy for construction, reduce investment outlay, for deep soft soil foundation, particularly broad way base significant effect successfully solves the excessive technical barrier of deep soft foundation section settlement of subgrade.

Description

A kind of hassock layer Foam lightweight soil road structure in deep soft foundation section
Technical field
The utility model is related to technical field of road engineering, and in particular to a kind of hassock layer foam in deep soft foundation section is light Matter dirt road based structures and construction method.
Background technology
Weak soil has the characteristics that high-compressibility, macrovoid ratio, and destabilization of roadbed occurs for the road Louis built on soft soil foundation And the problems such as differential settlement.Therefore, Soft Ground becomes the problem in road project.Solve the problems, such as this way There are two types of footpaths, and a kind of is the differential settlement for reducing ground, and another kind is adaptation of the enhancing structure object to uneven settlement of foundation Property.
Foam lightweight soil is that foam and cement mortar are uniformly mixed into fluid, and one kind of final coagulation forming contains The artificial light-duty filling material of a large amount of sealed porositys.Foam lightweight soil can mitigate permanent lotus suffered by ground instead of Stone Filled Embankment of banketing It carries, reduces uneven settlement of foundation, be widely used in traffic civil engineering field.But Foam lightweight soil is rigidity Larger fragile material easily occurs brittle break when larger uniform settlement occurs for ground, reduces the traffic capacity of road, prestige Coerce traffic safety.
The content of the invention
The purpose of this utility model is to provide a kind of hassock layer Foam lightweight soil road structure in deep soft foundation section and applies Work method solves uneven subsidence when broad width road crosses over deep soft foundation.
Technical solution is used by the utility model:
A kind of hassock layer Foam lightweight soil road structure in deep soft foundation section, it is characterised in that:
It is bottom-up including hassock layer Foam lightweight soil roadbed and supercrust;
Hassock layer is along road longitudinal direction making on deep soft soil foundation;
Foam lightweight soil roadbed placement layer by layer is on hassock layer, between the Foam lightweight soil roadbed of every two layers of placement layer by layer Equipped with galvanized wire mesh;The top surface of Foam lightweight soil roadbed is provided with supercrust.
Deformation joint is longitudinally equipped with along Foam lightweight soil roadbed.
It plants native bound edge and forms protective layer in Foam lightweight soil roadbed both sides.
Hassock layer making is on deep soft soil foundation, thickness range 0.5m ~ 1.2m.
For Foam lightweight soil roadbed placement layer by layer on hassock layer, every layer of thickness poured is 0.5m, using step slope, i.e., The width of after-pouring layer is less than the width of preceding layer, and both sides step slope ratio of slope is not less than 1:1.5.
Foam lightweight soil roadbed sets one of deformation joint every 10m ~ 20m, and the width of deformation joint is 1cm ~ 2cm.
Native bound edge is planted in roadbed both sides, and the thickness for planting soil is not less than 1m.
The utility model has the following advantages:
The utility model force-mechanism of Foam lightweight soil roadbed from soft soil foundation is started with, and is provided a kind of for deep The hassock layer Foam lightweight soil new-type embankment structure of Soft Roadbed, has the following advantages:
(1) " bridge formation " effect of Foam lightweight soil roadbed in Deep Thick Soft Ground is proposed, it is indicated that brittleness easily occurs for roadbed The root of destruction has drawn the relation curve of cushion thickness and roadbed bottom tensile stress.
(2) the new-type embankment structure of the utility model improves the comfort and service level of road travel, reduces operation Maintenance cost.The stress concentration of ground, the differential settlement amount for having adjusted roadbed are alleviated using hassock layer, reduce roadbed knot The tensile stress and shear stress of structure;Metal mesh between Foam lightweight soil has coordinated the deflection of road structure each several part, makes stress Uniformly;One of deformation joint is set every 10m ~ 20m, allows way of concrete foundations that fraction of convergent-divergent and differential settlement occurs.
(3) the new-type embankment structure construction of the utility model is quality controllable.Light-weight foamed way of concrete foundations belongs to large volume Concrete construction can reduce the heat of hydration of concrete using placement layer by layer, prevent thermal cracking.
(4) easy for construction, the saving time reduces investment outlay.It need not carry out deep gas reservoir so that construction can be quick It promotes, the materials such as gravelly soil, gravel, slag, convenient material drawing, low cost may be employed in hassock layer.
(5) product environmental protection, beauty.Using native bound edge is planted, not only with landscape but also roadbed material can be protected.
Description of the drawings
Fig. 1 is the bridging action of dual extension-compression modulus roadbed.
Fig. 2 is Foam lightweight soil bottom tensile stress and cushion thickness relation curve
Fig. 3 is the schematic cross-sectional view of the utility model road structure.
Fig. 4 is the schematic longitudinal section of the utility model road structure.
In figure, 1- hassock layers, 2- Foam lightweight soil roadbeds, 3- galvanized wire mesh, 4- deformation joints, 5- protective layers.
Specific embodiment
The utility model is described in detail With reference to embodiment.
Establish the simplified light-weight foamed way of concrete foundations structural finite element model finite element model of deep soft foundation.Pass through change The rigidity of ground and embankment ratio, obtains subgrade reaction distribution curve.Referring to the drawings 1, Modulus of Subgrade is 0.5 times of ground basic mode During amount, subgrade reaction is basin shape, substantially identical with upper pressure distribution shape, is that the subgrade reaction of typical flexible foundation is special Sign;Subgrade reaction is the shape of a saddle when Modulus of Subgrade is 50 times of ground;Modulus of Subgrade is 250 times or 1000 of ground Times when, intermediate subgrade reaction very little, and both sides subgrade reaction is very big, there is apparent bridging action, this will cause roadbed material Brittle break.The modular ratio weak soil of Foam lightweight soil roadbed is 100 to 1000 times high, therefore can be considered rigid foundation substantially, builds bridge Effect will seriously damage Foam lightweight soil road structure.
Using Foam lightweight soil+bed course processing deep soft foundation, change cushion thickness and choose(0.5m, 1m, 1.5m, 2m, 3m and 4m), while simulation takes the ground of different elasticity modulus(3MPa, 5MPa, 10MPa, 20MPa and 40MPa), obtained different pads Light soil embankment bottom tensile stress and the relation of uneven settlement of foundation under layer thickness, referring to the drawings 2.Research finds ground unevenness Even sedimentation is bigger, and light soil bottom tensile stress is bigger;When same size differential settlement occurs for ground, cushion thickness is bigger, gently Matter dirt road basal part tensile stress is smaller.
It can be seen that bed course can weaken bridging action, weaken influence of the uneven settlement of foundation to road structure, bed course Influence of the thicker ground to roadbed is smaller.In order to avoid increasing the increase that settlement of foundation is caused while the thickness of bed course, this reality With the new cushion thickness scope used for 0.5m ~ 1.2m.
Referring to the drawings 3, attached drawing 4, the utility model proposes the hassock layer Foam lightweight soil road structure in deep soft foundation section, It is bottom-up including hassock layer 1, Foam lightweight soil roadbed 2 and supercrust.Hassock layer 1 along road longitudinal direction making in Deep Thick Soft Ground On base;2 placement layer by layer of Foam lightweight soil roadbed on hassock layer 1, the Foam lightweight soil roadbed 2 of every two layers of placement layer by layer it Between be equipped with galvanized wire mesh 3;The top surface of Foam lightweight soil roadbed is provided with supercrust.
Deformation joint 4 is equipped with along 2 longitudinal direction of Foam lightweight soil roadbed.It plants native bound edge and forms protection in 2 both sides of Foam lightweight soil roadbed Layer 5.
1 making of hassock layer is on deep soft soil foundation, thickness range 0.5m ~ 1.2m.2 placement layer by layer of Foam lightweight soil roadbed In on hassock layer, every layer of thickness poured is 0.5m, and using step slope, i.e. the width of after-pouring layer is less than the width of preceding layer Degree, both sides step slope ratio of slope are not less than 1:1.5.Foam lightweight soil roadbed sets one of deformation joint 4, deformation every 10m ~ 20m The width of seam is 1cm ~ 2cm.Native 5 bound edges are planted in roadbed both sides, and the thickness for planting soil is not less than 1m.
Foam lightweight soil roadbed in Deep Thick Soft Ground has apparent " bridge formation " effect, and subgrade reaction centre is small, and both sides are big, Subgrade reaction distribution map is in the shape of a saddle, thus the moment of flexure suffered by road structure and shearing are larger, and brittle break easily occurs for roadbed;Pad Layer can mitigate the stress concentration of ground, adjust the differential settlement amount of roadbed, so as to reduce the tensile stress of road structure and cut Stress.
The utility model have the characteristics that adapt to differential settlement ability it is strong, it is easy for construction, reduce investment outlay, for deep soft Soil base, particularly broad way base significant effect, successfully solve the excessive technology of deep soft foundation section settlement of subgrade Problem.
The construction method of the hassock layer Foam lightweight soil road structure in above-mentioned deep soft foundation section, comprises the following steps:
Step 1:Cleaning leveling construction site, removes place branch, mud, before cushion construction, substrate without apparent ponding, Without mollisol.Design requirement making hassock layer is pressed after the acceptance(check) of base.
Step 2:Lateral baffle and segmentation template be installed, all fronts Foam lightweight soil roadbed is using segmentation, subregion, comprehensive Laminated pouring.For Foam lightweight soil roadbed placement layer by layer on hassock layer, every layer of thickness poured is 0.5m, is put using step Slope, the i.e. width of after-pouring layer are less than the width of preceding layer, and both sides step slope ratio of slope is not less than 1:1.5.Longitudinal section length 10m ~ 20m using false form between longitudinally adjacent cast section, lays 1~2cm thickness plastic foamboards after plate.Form removal to be achieved Intensity is to remove false form, leave plastic foamboard as deformation joint, deformation joint must assure that vertical.One layer is often poured Foam lightweight soil is laid with one layer of metal mesh, and metal mesh has to be off in deformation joint, in the light-weight foamed coagulation that last layer pours Next layer is poured before native initial set.
Step 3:After light-weight foamed concrete reaches design strength and acceptance(check), plant native bound edge and form protective layer, plant The thickness of soil is not less than 1m.
Step 4:Carry out supercrust and the construction of other affiliated facilities.
The content of the utility model is not limited to cited by embodiment, and those of ordinary skill in the art are new by reading this practicality Type specification and to any equivalent conversion that technical solutions of the utility model are taken, be the claim institute of the utility model Cover.

Claims (7)

1. a kind of hassock layer Foam lightweight soil road structure in deep soft foundation section, it is characterised in that:
It is bottom-up including hassock layer(1)Foam lightweight soil roadbed(2)And supercrust;
Hassock layer(1)Along road longitudinal direction making on deep soft soil foundation;
Foam lightweight soil roadbed(2)Placement layer by layer is in hassock layer(1)On, the Foam lightweight soil roadbed of every two layers of placement layer by layer (2)Between be equipped with galvanized wire mesh(3);The top surface of Foam lightweight soil roadbed is provided with supercrust.
2. a kind of hassock layer Foam lightweight soil road structure in deep soft foundation section according to claim 1, feature exist In:
Along Foam lightweight soil roadbed(2)Longitudinal direction is equipped with deformation joint(4).
3. a kind of hassock layer Foam lightweight soil road structure in deep soft foundation section according to claim 1, feature exist In:
Foam lightweight soil roadbed(2)It plants native bound edge and forms protective layer in both sides(5).
4. a kind of hassock layer Foam lightweight soil road structure in deep soft foundation section according to claim 1, feature exist In:
Hassock layer(1)Making is on deep soft soil foundation, thickness range 0.5m ~ 1.2m.
5. a kind of hassock layer Foam lightweight soil road structure in deep soft foundation section according to claim 1, feature exist In:
Foam lightweight soil roadbed(2)For placement layer by layer on hassock layer, every layer of thickness poured is 0.5m, using step slope, i.e., The width of after-pouring layer is less than the width of preceding layer, and both sides step slope ratio of slope is not less than 1:1.5.
6. a kind of hassock layer Foam lightweight soil road structure in deep soft foundation section according to claim 2, feature exist In:
Foam lightweight soil roadbed sets one of deformation joint every 10m ~ 20m(4), the width of deformation joint is 1cm ~ 2cm.
7. a kind of hassock layer Foam lightweight soil road structure in deep soft foundation section according to claim 3, feature exist In:
Native bound edge is planted in roadbed both sides, and the thickness for planting soil is not less than 1m.
CN201721176175.3U 2017-09-14 2017-09-14 A kind of hassock layer Foam lightweight soil road structure in deep soft foundation section Active CN207452609U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109736155A (en) * 2018-11-28 2019-05-10 中交一公局桥隧工程有限公司 Building castoff Filling Expressway Subgrade construction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109736155A (en) * 2018-11-28 2019-05-10 中交一公局桥隧工程有限公司 Building castoff Filling Expressway Subgrade construction

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