Method for construction of floating body of road

FIELD: construction.

SUBSTANCE: invention relates to the construction of highways, and is intended to create the permanent roads on weak swampy subgrades. Method for construction of the floating road body includes application of liquid layer of the foamed polymeric material of predetermined width on the surface of the weak subgrade, on the surface of which formed after polymerisation, the reinforcing geosynthetic material is placed, then the process of stacking of layers is repeated as many times as necessary till the achievement of the required height and geometry of the floating body of road. After that, the road body from the foamed polymer material is filled with mineral soil with thickness not less than 0.3 m. Road pavement is constructed, bottom layer of which is strengthened by cementing. The total height of the bottom part of the road body from the foamed polymer material hp and height of the upper part from mineral soil together with the road pavement hmp is determined from the given relationship.

EFFECT: increase of the load-bearing capacity, reduction of materials consumption.

2 cl, 1 dwg

 

The invention relates to the construction of roads and is designed to create permanent roads on low marshy grounds.

Known methods for embankment subgrade during the construction of permanent roads on low marshy grounds (1, 2) and temporary roads (winter road) (3).

At the surface weak base layers poured, leveled and compacted layers of peat. Then peat mound poured in layers of mineral soil (with levelling and compaction), forming the outlines of the subgrade. Due to the use of peat in the lower part of the mound get lightweight (floating) roadbed, which gradually thickens weak water-saturated ground due to consolidation, there is a significant sediment mounds. The implementation of the above methods of construction earthworks significantly reduces the need for imported certified soil and reduces the cost of highway construction.

The main disadvantage of these methods is the fact that this floating mound gradually sinking. At one point, and consolidation of the base, and the peat at the bottom of the base of the mound leads to a significant non-uniform deformation of the subgrade and road p�cushion, which reduces its evenness and determines the need for regular maintenance of the pavement during the operation stage of the road.

Known technical solutions closest to the essential features of the claimed is the method of construction of the floating mounds of polystyrene foam (4).

The essence of this method is that weak on the surface of the base layer stack of finished blocks of polystyrene foam with a volume of 1 to 1.5 m3then fasten them with special clips or grooves, cover the lower part of the mound of mineral soil, forming the outlines of the subgrade and to prevent damage to the Styrofoam.

The main disadvantage of this method is the lack of a rigid connection between the blocks and layers, since the fastening bracket and the slots are broken. In addition, before laying the first layer of blocks required alignment of weak road base that technologically difficult to achieve.

The object of the invention is to provide a method of laying a floating mound of monolithic reinforced foamed material having a higher load-bearing capacity and low cost in comparison with the prototype.

Said technical result is achieved in that a method of floating structures embankments, comprising applying to the surface�knosti weak subgrade liquid layer foamed polymeric material of a given width, on the surface of which is formed after the onset of polymerization stack of reinforcing geosynthetic material, then repeat the process of stacking layers as necessary to achieve the desired height and geometry of the floating mound, then a mound of foamed polymeric material is poured mineral soil with a minimum thickness of 0.3 m and arrange road clothes, the bottom layer which strengthen astringent, while the total height of the lower part of the mound of foamed polymeric material hpand the height of the top of the mineral soil with pavement hMCHis determined from the condition:

1,1 σaboutphpMCHhMCH≥0.8 σabout

where σabout- bearing capacity of weak bases, MPa;

ρp- weighted average density foamed polymeric material (including composite material), kg/m3;

ρMCH- weighted average density of the mineral soil and all pavement layers placed on top of the foamed polymeric material, kg/m3;

hp- the thickness of the layer of foamed polymeric material (including composite material), m;

hMCH- the thickness of the layer of mineral soil and all pavement layers placed on top of the foamed polymeric material, m.

Fig.1 presented�Lena floating mound, consisting of weak subgrade 1, layer foamed polymeric material of a given width 2, the surface of which is laid reinforcing geosynthetic material 3, and the mound of foamed polymeric material filled with mineral soil 4 and covered with pavement 5, the bottom layer which is reinforced binding.

The ability to achieve the monolithic construction is achieved in that all layers of polymeric foam are fastened together during application of the foam generating installation and subsequent polymerization directly in the design of a floating Foundation. The increased rigidity and strength is achieved by using a reinforcing layer of geosynthetic material placed in the load direction. Cost of construction is reduced due to the fact that the components of the polymer foam come to the construction site in liquid or solid form, when their density is 15-20 times higher than that of the polymer blocks of factory manufacturing. At the construction site foam was produced using penogeneriruyuschey units (geomembrane) (5). These settings allow you to obtain a polymer foam with different multiplicity (due to the different ratios between the solid and gaseous substance), density and strength that allows you to adjust the floating ability and strength of materials of road design�instruction in height, width or in volume, which ultimately reduces the cost of the floating base. At the final stage of construction of the lower part of the floating mounds poured mineral soil or concreted with the use of geosynthetic reinforcement material, and then coated pavement. Along with geogrids, geotextiles and geomembranes polystyrene belongs to the category of geosynthetics. In road construction used products made of expanded polystyrene form of paving slabs with a thickness up to 100 mm, manufactured by extrusion (XPS plate) and in blocks (EPS blocks). They are mainly used in the form of insulating layers.

The LIST of references

1. Construction guide subgrade of highways / Ministry of transport construction of the USSR. - M.: TRANSPORT, 1982. - 200 p.

2. VSN 26-90 manual for design and construction of highways oil and gas fields of Western Siberia / the USSR Ministry of transport. - M.: Soyuzdornii, 1991. - 198 p.

3. VSN 137-89 Design, construction and maintenance of winter roads in Siberia and North-East of the USSR / the USSR Ministry of transport. - M.: Soyuzdornii, 1991. - 125 S.

4. Yartsev V. P. Physical-mechanical and technological basis for the use of polystyrene foam in thermal insulation of buildings and structures: textbook / V. P. Yartsev, K. A. Andrianov, D. V. Ivanov. - Tambov: Publishing house of GOU VPO TSTU, 2010. - 120 p.

5. EBM 218.56.003-2010 Recommendations for use of geosynthetics in the construction and repair of highways / road service. - M.: "Informator", 2010. - 140 S.

1. Method of floating structures embankments, comprising applying to the surface a weak subgrade liquid layer foamed polymeric material of a given width, the surface of which is formed after the onset of polymerization stack of reinforcing geosynthetic material, then repeat the process of stacking layers as necessary to achieve the desired height and geometry of the floating mound, then a mound of foamed polymeric material is poured mineral soil with a minimum thickness of 0.3 m, arrange road clothes, the bottom layer which strengthen astringent, while the total height of the lower part of the mound of foamed polymeric material hpand the height of the top of the mineral soil with pavement hMCHis determined from the condition:
1,1 σaboutphpMCHhMCH≥0.8 σabout
where:
σabout- bearing capacity of weak bases, MPa;
ρp- weighted average density foamed polymeric material (including composite material), kg/m3;
ρMCH- CPE�unweighted density of mineral soil and all the pavement layers, lying on top of foamed polymeric material, kg/m3;
hp- the thickness of the layer of foamed polymeric material (including composite material), m;
hMCH- the thickness of the layer of mineral soil and all pavement layers placed on top of the foamed polymeric material, m.

2. Method of floating structures embankment according to claim 1, characterized in that the geosynthetic material is placed normal to the surface of the weak subgrade.



 

Same patents:

FIELD: construction.

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FIELD: construction.

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4 cl, 2 dwg

FIELD: building, particularly for erecting road embankments in areas with high-temperature permafrost ground.

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3 cl, 1 dwg, 1 tbl

FIELD: building, particularly for constructing road embankments on permafrost ground bases.

SUBSTANCE: road embankment comprises embankment body laid on natural ground surface, ballast section formed on the main embankment area and heat insulation layer. Road embankment has side auxiliary ground bodies with heights of not less than 0.3 m and Bb widths located within the boundaries of the main embankment area, slopes thereof and on horizontal area of natural ground surface at embankment slope base from ballast section sides. Heat insulation layer with Rh thermal resistance is located on leveling layer of dry frozen sand immediately under side auxiliary ground body. Bb is determined from specified condition.

EFFECT: increased stability and durability of embankment built on permafrost ground under heavy drift-snow transport conditions, simplified perennial technology of building thereof and extended range or local permafrost ground application.

3 cl, 5 dwg

FIELD: building, particularly for constructing road embankments on permafrost ground bases.

SUBSTANCE: road embankment comprises embankment body, ballast section formed on the main embankment area and heat insulation layer. Road embankment has side auxiliary ground bodies having hb heights and Bb widths located from ballast section sides within the boundaries of the main embankment area on natural ground surface at embankment slope base. Embankment body includes three layers, namely lower layer having hl height, medium layer having hm height and upper one having hu height. Upper layer is made of drainage soil. Heat insulation layer having Rh thermal resistance is located on leveling layer of dry frozen sand immediately under side auxiliary ground body. Heat insulation layer extends from its bottom to medium layer top surface and then over the top surface to vertical plane passing through the edge of main embankment area. Auxiliary ground body hb height is defined to increase convenience of mechanized embankment forming and is equal to 0.3 - 0.7 m in separate areas thereof. Main embankment dimensions are determined from predetermined conditions.

EFFECT: increased embankment stability and durability.

2 cl, 1 dwg

FIELD: building, particularly to erect road embankments.

SUBSTANCE: road embankment comprises embankment ground, retaining wall and support structure. Embankment ground is divided with flat geonet webs into several layers. The retaining wall is also divided into layers similar to ground layers and covered with single geonet webs. Each retaining wall layer has vertical through slots filled with macroporous draining material. Flat geonet webs are inserted between hollow layers of retaining wall. Vertical cavities of adjacent retaining wall layers in height direction are superposed in plan view. Length L of ground layers reinforced with flat geonet webs beginning from inner retaining wall surface is determined from a given equation. Road embankment erection method involves forming retaining wall base; laying road embankment ground layers alternated with flat geonet webs; erecting retaining wall comprising several layers and constructing support structure. Base is initially created and then lower erection wall layer is erected on the base, wherein the retaining wall is provided with vertical cavities having heights corresponding to ground layer heights. The vertical cavities are filled with coarse material for 2/3 of volume thereof and then embankment ground layer is poured and compacted. Embankment ground is leveled and coarse material is added in the cavities. The coarse material is leveled and geonet web is placed onto the coarse material within the bounds of retaining wall and embankment ground layer. Next layers are formed in similar manner. Reinforced concrete block for retaining wall forming comprises device, which cooperates with ambient ground. The device comprises one or several vertical through cavities to be filled with granular coarse material. Depression in concrete is formed in lower block surface in front of erection loop.

EFFECT: reduced material consumption and erection time, increased service life, stability and operational reliability.

9 cl, 12 dwg

FIELD: building, particularly to construct road embankments on permafrost ground.

SUBSTANCE: road embankment comprises embankment body composed of two stacked layers and ballast prism arranged on base platform. Each layer is formed as trapeze with larger base facing downwards. Lower base of upper layer trapeze has dimension c equal to that of upper base of lower layer trapeze. Lower base of upper layer trapeze mates upper base of lower layer trapeze. Upper layer has side slope less than that of lower layer. Main embankment parameters are determined from corresponding relations.

EFFECT: provision of embankment stability due to permafrost temperature reduction in embankment base.

2 cl, 1 dwg

FIELD: road building.

SUBSTANCE: invention can be used to strengthen weak base, increase strength and load-bearing capacity of roadbed. Proposed construction includes earth roadbed with shoulders and slopes, support longitudinal trench filled with material arranged in earth roadbed with geosynthetic material placed over top of trench. Longitudinal trench arranged along axis of earth roadbed or several longitudinal trenches are made with width of 0.6-10 at depth of 1.2-2.6 m filled with friction material, and geosynthetic material with minimum breaking strength of 15kN/m in longitudinal direction and of ≥ 20 kN/m in cross direction is placed over top of trench with back lapping into embankment providing formation of semiholders from two sides of earth roadbed.

EFFECT: improved service characteristics of road, increased time between repairs owing to elimination or reduction of sagging of earth roadbed base.

2 cl, 2 ex, 4 dwg

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