Earthen building on a weak foundation

 

The invention relates to the field of construction and can be used in the construction and reconstruction of linear structures on weak, including permafrost 3rd and 4th categories thermoperiodocity, noncontributing areas, and marshes of the 2nd and 3rd types. Earthen building on a weak Foundation includes the body of the mound of alternating layers of bulk soil and panels of flexible synthetic non-woven material (SNM), arranged in the longitudinal direction over the whole length of the plot with a weak base and in the cross - width of the roadway. What's new is that it is equipped with rods, connected by an anchor with two sides of the weak base in solid ground and having on the upper parts of the rollers, and the cloth SNM is made in the form of a closed ribbon and placed on the project mark paintings of the mound, with a closed ribbon stretched between the upper parts of each are connected by an anchor with two sides of the weak base in solid ground rods and the inner space of the tape is filled with drainage material. The technical result of the invention consists in the development of earth structures, the stability of which is provided by removing a residue of the weak base under the influence of concentrated loads is ravlenija and transfer the load from the site with a weak Foundation on the solid ground. 2 C.p. f-crystals, 1 Il.

The invention relates to the field of construction and can be used in the construction and reconstruction of linear structures on weak, including permafrost 3rd and 4th categories thermoperiodocity, noncontributing areas and swamps of the 2nd and 3rd types (Railways, roads, pipelines, dams, and dikes).

Almost 10% of road structures are constructed and operated on a weak Foundation.

The main reason for the loss of carrying capacity of structures under these conditions is associated with the deformations that occur in the thixotropic decompression and extrusion-plastic soils saturated grounds (peat, loess, silt and so on). Deformations occur under the influence of the rolling load and the weight of the barrows themselves are linear structures both in the transverse and longitudinal directions.

With the growth of gruzoperevozki dynamic vibration impacts from the rolling load increases, respectively, increase thixotropic phenomena in soils, and the necessary increase in regulatory design parameters of structures causes an additional extrusion razuplotneniya fluid soils and, soomali as sediment continues throughout the life of the object.

It is well known that the stability of earth structures is provided by reclamation (drainage) soil base. But draining soil base within closed areas is almost impossible, so one of the ways to remove such sediment soil Foundation is a device reinforcing structures.

Known earthen building on a weak Foundation /1/. Earthen construction contains in the upper part of the mound, and the lower armature. Valves made in the form of ropes and placed in the active area of the base of the mound transverse tiers. While ropes laid bulge upward. At the ends of ropes anchored bulk items.

The advantage of this design is to reduce extrusion forces in the period of consolidation of the active thickness of the base and, accordingly, preventing Vipera weak mass of soil. It the reaction of the valve in an upright position and compensate for the load on the Foundation. The result is reduced extrusion force (the weight of the embankment and payload) on low plastic soils of the basis, and, accordingly, reduced sludge, and, consequently, slows down the sediment structure.

The disadvantage of this construction aveage in the longitudinal direction are related to the heterogeneity of the weak base along the length of the plot. This leads to the fact that the reaction resistance from the valve along the entire length not distributed evenly. The uneven distribution of reactions leads to the emergence and development of the sediment in the longitudinal direction. Deformation structures in the cross section associated with a form of reinforcement of the Foundation in the form of an arch. With this reinforcement of the Central part of the structure and slope of the area perceive the load is not evenly. This is due to the fact that the convex part is the maximum resistance of the valve from the load, and the edges - decreasing. All this makes it difficult to ensure the stability of sloping areas and negatively affect the integrity of the structure during its operation. The durability of such structures is not more than 10 years.

Thus, the known design does not provide uniform load distribution and, accordingly, the complete elimination of the precipitation on the length of construction, and in cross-section, but only irregularly reduces it.

The closest in technical essence and the achieved result is an earthen structure on a weak basis, including the body of the mound of alternating layers of bulk soil and panels of flexible synthetic non-woven material (SNM). Polota CNM filled with soil and form resistant prism in the longitudinal direction on both sides of the embankment /2/. Cloth CNM feel the tension from the weight of the bulk soil and the movable load R. this persistent prism hinder the movement of panels SNM and contribute to their tension. Tension CNM allows to distribute the concentrated load on the cross section of structures and, accordingly, to reduce it in the middle section.

The advantage of this design is that the thrust of the prism in the slopes of the bulk structures reduce the draught in the transverse direction and thereby protect the body of the mound from deformation. This is due to the fact that through hard prisms paintings SNM are always in tension, which allows to reduce the concentrated load from R. Reduction of a concentrated load in the transverse direction leads to a decrease in precipitation of the body of the embankment cross-sections. These advantages are manifested only in the body of the embankment.

The disadvantage of this design is that the base, which is itself reinforced embankment remains weak. This is due to the fact that the reaction resistance F in the axial prisms only reduce the pressure and, consequently, reduce deformation (precipitation) of the Foundation in the center of the mound, make them evenly distributed along the cross is Lee in the longitudinal direction. This is because in the longitudinal direction of the structure is weak, non-uniform base, which has a different resistance to a variety of soils to loads. Insulated panels SNM provide enough retention efforts in the transverse direction, and only partly in longitudinal. The presence of weak retention efforts in the longitudinal direction causes differential settlement and violates the integrity of the structure. The durability of this design is also not more than 10 years.

Thus, the known device eliminates the possibility of complete elimination of rainfall. The lack of integrity leads to uneven load distribution in the longitudinal direction and precipitation in both longitudinal and transverse directions, which violates the stability of the structures over time.

The basis of the invention is to develop an earthen structure, the stability of which is provided by removing a residue of the weak base under the influence of concentrated loads during operation due to their redistribution in the body of earthen structures in the longitudinal and transverse directions and transfer the load from the site with a weak Foundation on the solid ground.

In addition, as a drainage material used sand.

In addition, the lower ends of each of the rods, connected by an anchor in strong soils, made in the form of loops.

The construction of the proposed excavation construction ensures its stability at the intersection of bogs 2nd-3rd type and termoplastichnykh soils of the 3rd and 4th categories, noncontributing areas Marey.

Thanks to the combination of features of the technical solutions earthen structure is an elastic design. In transverse and longitudinal section of such design efforts from the perceived burden equally. This is due to the redistribution of concentrated loads Uniform distribution of a concentrated load in the longitudinal and transverse cross sections related to the tension of the longitudinal panels SNM. When the impact load on the top of the cloth SNM is the elastic tension of the lower panels SNM (in a closed ribbon. The presence of rods and soil inside a closed ribbon design promotes uniform distribution of load in both longitudinal and transverse directions over the entire area of the canvas of the road due to monolithic structures, and transfer the load on a solid Foundation.

Load redistribution on a solid Foundation and uniform distribution throughout the building leads to the reduction of any focused effort from any load on the most deformable area (maximum precipitation) structures.

Thus the rollers can significantly reduce the force from the elastic tension of panels to be transmitted to the traction.

The drawing shows a diagram of earth structures on a weak Foundation.

Earthen building 1 on the soft ground 2 contains the body of the mound 3, panels CNM 4 and rod 5.

Cloth CNM 4 laid on the canvas mound 6 in the form of a closed ribbon 7. In the longitudinal direction of the cloth CNM 4 occupy the whole length of the plot with a weak base L, and cross - entire width of the roadway Century

Thrust 5 installed on both sides of the plot SCE, allowing for the supplementary feeding to ensure its design position. Closed belt 7 of the panels CNM 4 tight on the top of each thrust 5. The ends of the rods are made in the form of loops 8. Loop 8 rod 5 is rigidly fixed to the solid ground 9 anchors 10.

The device operates as follows.

When exposed at any point in the construction of the concentrated load P is transferred to the canvas mounds 6 and, respectively, a closed ribbon 7. This raises the tensile stress of the upper cloth closed tape 7, which tagum 5, is transmitted to the bottom of the cloth closed tape 7. In the bottom panels of elastically strained. When this thrust experiencing the largest such effort from tension paintings CNM 4, remaining in the same position due to anchor fastener 10. Due to a constant position of the rod 5 effort from the tension of the lower paintings CNM evenly distributed over the entire area of a closed ribbon 7, i.e., both longitudinal and transverse directions. Efforts have the upper part of the rod 5 is transmitted to the anchor mount 10.

Thus, in design, due to the tension of panels CNM is a redistribution of a concentrated load in the longitudinal and transverse napravlennosti.

To reduce tension in the panels CNM closed tape 6 inside is filled with draining soil (sand), which provides a monolithic structure and contributes to a more uniform distribution of load in both longitudinal and transverse directions over the entire area of the leaf mound. This helps to increase its service life, therefore, durability of the structure.

To reduce the effort is thrust upon them in the upper part it is additionally worn rollers 11, which also increases the reliability and durability of the structure. The rollers reduce the tensile forces transmitted to the thrust, by providing uniform tension panels SNM in the upper and lower parts of a closed ribbon.

The durability and stability of the claimed design when using is, as shown by the calculations, at least 15-20 years, which is 2 times the durability of known designs.

SOURCES OF INFORMATION TAKEN INTO ACCOUNT 1. A. C. the USSR 1330249, MKI E 02 In 7/06. The earthen dam on weak Foundation / S. L. Topchiy (USSR), Ukr. Niigon (USSR) -3997197/29-15. Declared 10.11.85. Published 15.08.87. Bull. 30.

2. A. C. the USSR 894076, MKI E 02 D 17/18. Barrow / A. A. Cernan (USSR), SibNIA (USSR) - 2835919/29-33. Zaya is of a weak base, includes the body of the mound of alternating layers of bulk soil and panels of flexible synthetic non-woven material (SNM), arranged in the longitudinal direction over the whole length of the plot with a weak base and in the cross - width of the roadway, characterized in that it is provided with rods, connected by an anchor with two sides of the weak base in solid ground and having on the upper parts of the rollers, and the cloth SNM is made in the form of a closed ribbon and placed on the project mark paintings of the mound, with a closed ribbon stretched between the upper parts of each are connected by an anchor with two sides of the weak base in solid ground rods, and the internal space of the tape is filled with drainage material.

2. Earthen building on a weak Foundation at p. 1, characterized in that the draining of the material used sand.

3. Earthen building on a weak Foundation at p. 1, characterized in that the lower ends of each of the rods, connected by an anchor in strong soils, made in the form of loops.

 

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1 dwg

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