CN101413244B

CN101413244B - Earth work grille for reinforcing highway foundation and its use method

Info

Publication number: CN101413244B
Application number: CN2008101718907A
Authority: CN
Inventors: 不公告发明人
Original assignee: Institute of Geology and Geophysics of CAS
Current assignee: Institute of Geology and Geophysics of CAS
Priority date: 2008-11-17
Filing date: 2008-11-17
Publication date: 2012-02-22
Anticipated expiration: 2028-11-17
Also published as: CN101413244A

Abstract

The invention provides a geotechnical grille for reinforcing highway subgrade, as well as an application method thereof. A grille net is formed by vertically and horizontally weaving high-strength and high-modulus polyvinyl chloride polymers, so as to increase the tensile strength of reinforced belts; an outer layer of the grille is coated with a modified rubber coating; rubber is mixed with anti-aging agent, antioxidant, light screener and other master batches, so as to increase the creep resistance and corrosion resistance of the reinforced belts; surface layers of the longitudinal and transverse reinforced belts of the grille are provided with coil-shaped embossed threads so as to increase friction force with soil; meshes of the grille are round so as to reduce stress concentration andincrease the extensibility of the reinforced belts; and nodes of the reinforced belts of the grille are provided with bilateral strengthening columns, so as to stop the slippage between soil body andthe grille, increase the shearing resistance of the subgrade, balance settlement and prevent the grille from being pulled out of the subgrade. The geotechnical grille has the advantages that the grille is high in the strength of polymer materials, little in creep because of the modified rubber smeared outside, high in tensile strength and low in tensile strain, and the round meshes, the threads of the reinforced belts and the strengthening columns fully occlude the soil body so as to form a space compound strengthening structure, thereby improving the entire shearing strength and settlement balancing performance of the subgrade.

Description

A kind of GSZ that adopts carries out the method that highway subgrade strengthens

Technical field

The present invention relates to a kind of highway subgrade intensity that can make increases, and makes the GSZ and the method for using thereof of the balanced sedimentation of roadbed, belongs to technical field of civil engineering.

Background technology

In highway subgrade, side slope protection, dam construction are built, often be employed in the method that adds geosynthetics in the soil body, commonly used like GSZ.Through the embedding anchoring of grid and soil block and the frictional force between the grid and the soil body, strengthen the intensity of the soil body and reach the purpose of balanced sedimentation, especially in highway subgrade, be used widely.High-strength polymer also is furnished with in length and breadth that the GSZ of muscle and pore structure is applied in the civil engineerings such as road and rail roadbed, slope seepage control landslide, river levee shore protection, has increased the engineering life-span.GSZ can be divided into plastic grill and fabric grid at present.The plastics GSZ, technology is simpler, and is cheap, but long-time use can show serious creep, causes the degeneration of structural stability.The fabric GSZ, performance is good, and creep-resistant property is strong, but technology is loaded down with trivial details, involves great expense.The subject matter that present GSZ is used for highway subgrade is: the grid of horizontal arrangement; Be prone in the flat motion of water in soil; Can not play effective reinforcement effect to the soil body; After the long-time operation of highway, be not that grid broken be exactly that grid is drawn out roadbed, thereby cause side slope protection that secondary destruction is taken place.

Summary of the invention

Technical problem to be solved by this invention is, overcomes the problem that exists in the existing GSZ technology, and a kind of high-strength earth work grille net is provided, and should prevent that grid from being broken, and prevents that again grid is drawn out roadbed.

Technical solution of the present invention is characterized in that, grid is worked out by the high-strength and high-modulus polyvinyl chloride polymer in length and breadth, with the tensile strength of strength bar band; The grid skin is surrounded by the modified rubber coating, is mixed with masterbatch such as age resister, antioxidant and photomask agent in the rubber, with the creep resistance and the corrosion resistance of strength bar band; There is round embossing screw thread on the vertical horizontal bar band top layer of grid, with the frictional force of increase with earth; The grid mesh is circular, concentrates strength bar band extensibility to reduce stress; There is bilateral " reinforcing prop " at grid muscle band node place, and one-sided length forms netted composite construction with the soil body about 3cm, slides to stop between the soil body and grid, strengthens the roadbed shear behavior, and balanced sedimentation prevents that grid is drawn out roadbed.

Method for using of the present invention: (1) spreads loose earth to the embankment surface, and compacted depth is controlled at 30～50cm; (2) after the compacting; To be somebody's turn to do " reinforcing prop " GSZ edge direction vertical with direction of traffic spreads to the embankment surface; Curb leaves and is not less than 2m length grid; Be used for anti-package, lap length that grid follows the car direction when laying otherwise, " reinforcing prop " dislocation lap joint is enclosed within grid circular net intraocular less than 20cm; (3) artificial grid is strained in length and breadth, and " reinforcing prop " is knocked in the compacted soil, re-lay second layer soil, and roll with rubber hammer, at this moment " reinforcing prop ", grid mesh with the abundant interlock of the soil body; (4) with embankment both sides grid anti-package to curb, with new laying grid overlap joint, and will " reinforcing prop " misplace and be enclosed within the grid, with rubber hammer " reinforcing prop " knocked in compacted soil, re-lay the 3rd layer of soil.

Advantage of the present invention: (1) high-strength and high-modulus polyvinyl chloride polymer strength of materials is big, and skin scribbles modified rubber, and creep is little, and the performance of high tensile, low tensile strain is arranged; (2) the circular mesh of grid has reduced stress and has concentrated, and the grid muscle has round embossing screw thread; Improved frictional force with the soil body; Node place " reinforcing prop " embeds the soil body, has stoped the slip between the grid and the soil body, and circular mesh, muscle is threaded and " reinforcing prop " and the abundant interlock of the soil body; Form the space compound reinforcement, improved the integral anti-shearing intensity of roadbed and the performance of balanced sedimentation; (3) grid lap-joint can utilize " reinforcing prop " to be inserted in the grid intraocular, does not re-use the iron wire binding, thereby has avoided grid to be prone to situation about being bitten broken by iron wire; (4) low price of existing plastic grill has the high-performance of fabric grid again, and construction is simple, and is workable.

The present invention is suitable for highway embankment, slope project, foundation engineering isolith geotechnique journey field.

Description of drawings

Fig. 1 is a kind of plan view that is used for the GSZ of highway subgrade enhancing.Among the figure: the circular mesh of 1 grid, 2 grid reinforcing props, 3 round embossing screw threads.

Fig. 2 is the A-A sectional view of this invention grille plane figure.Among the figure: 2 grid reinforcing props.

Fig. 3 is the drawing of 3 round embossing screw threads among this invention grille plane figure.Among the figure: 2 grid reinforcing props.

Fig. 4 is that this invention grid is used to reinforce the sketch map of highway subgrade.Among the figure: 4 " reinforcing prop " GSZ.

The specific embodiment

Embodiment: (1) should invent GSZ and be laid on the embankment after original ground is laid the thick compacted soil of 30cm, and the ultra shop of curb 2～3m is used for back bag; (2) follow that lap length is 20～30cm between car direction grid, reinforcing prop 2 is inserted in the grid mesh 1, play the purpose of mutual build-in; (3) edge is in length and breadth to the tension grid; With rubber hammer reinforcing prop is knocked in the compacted soil earlier and fixed, will loosen the soil is laid on the grid again, after having rolled; The part of the ultra shop of first floor grid oppositely returned wrap the curb position, and knock in the compacted soil reinforcing prop fixing with rubber hammer; (4) second layer grid is layered on the compacted soil, the ultra shop of curb 2～3m, and return after the bag grid overlaps each other with curb, knock in the compacted soil reinforcing prop fixing with rubber hammer; (5) will loosen the soil again and be laid on the grid, by (3) with (4) one step process compacting soil body, lay grid; (6) roadbed such as Fig. 3 after reinforcing, side slope can be laid planting soil in both sides, hangs the net grass-seed of sowing grass seeds by duster, the greening side slope, the reinforcing prop on the side slope can play the effect that solid soil is hung net.

Claims

1. one kind is adopted GSZ to carry out the method that highway subgrade strengthens; GSZ is worked out by the high-strength and high-modulus polyvinyl chloride polymer in length and breadth, and the GSZ skin is surrounded by the modified rubber coating, is mixed with age resister, antioxidant and photomask agent masterbatch in the rubber; Grid mesh (1) is circular; There is bilateral reinforcing prop (2) at grid muscle band node place, one-sided length 3cm, and there is round embossing screw thread (3) on the vertical horizontal bar band top layer of grid; GSZ is used for the enhancing of highway subgrade, it is characterized in that:

(1), after original ground is laid the thick compacted soil of 30～50cm, GSZ is laid on the embankment, the ultra shop of curb is not less than 2m, is used for back wrapping;

(2), follow that lap length is not less than 20cm between car direction GSZ, reinforcing prop (2) dislocation lap joint is inserted in the GSZ mesh (1), play the purpose of mutual build-in;

(3), the edge is in length and breadth to the tension grid; With rubber hammer reinforcing prop is knocked in the compacted soil earlier and fixed, will loosen the soil is laid on the grid again, after having rolled; The part of the ultra shop of first floor grid oppositely returned wrap the curb position, and knock in the compacted soil reinforcing prop fixing with rubber hammer;

(4), second layer grid is layered on the compacted soil, the ultra shop of curb is not less than 2m, and returns after the bag grid overlaps each other with curb, knocks in the compacted soil reinforcing prop fixing with rubber hammer;

(5), again will loosen the soil is laid on the grid, by the 3rd and the 4th one step process compacting soil body, lays grid;

(6), the roadbed after reinforcing, side slope is laid planting soil in both sides, hangs the net grass-seed of sowing grass seeds by duster, the greening side slope.