CN201224858Y - Road foundation structure for running of heavy type transport vehicle - Google Patents

Abstract

The utility model discloses a road bed structure provided with strong road bed bearing capacity, small settling volume and secure and reliable work and used for the traveling of a heavy-duty transport vehicle, which comprises a plurality of layers of back packing layers arranged in a pit foundation. The back packing layers comprise a lime and soil padding layer (30 percent of lime and 70 percent of soil in volume ratio), graded broken stone lime and soil layer and a cement and gravel stationary layer which are distributed from down to up; the thickness of the lime and soil padding layer (30 percent of lime and 70 percent of soil in weight ratio) is 200 mm to 400 mm, the lime and soil padding layer is formed by lime and soil in a blending way, the weight ratio of the lime and the soil is 3:7, the plasticity index of the soil is 16 to 24, the quality of the lime is above third grade, and the water content is 14-18 percent; the thickness of the graded broken stone lime and soil layer is 500 mm, the graded broken stone lime and soil layer is formed by lime, water and broken stone in a vibration compaction way, and the weight ratio of the lime, the water and the broken stone is 1:1:3; the grain diameter of the broken stone is 5-7 cm, the apparent density of the graded broken stone lime and soil layer through the vibration compaction is 2.871, the packed density is 1.78, the bulk density is 1.592, and the void ratio under the compact state is 42.7 percent; the thickness of the cement and gravel stationary layer is 200 to 300 mm, and the cement and gravel stationary layer is formed by cement, broken stone, stone dust, water and gravel through mechanical blending; and the weight ratio of the cement, the broken stone, the stone dust, the water and the gravel is 2:18:12:2:1.

Description

The road structure that is used for heavy transport vehicle traveling

Technical field

The utility model relates to a kind of project organization of railway bed, especially relates to a kind of road structure that is used for heavy haulage device walking system.

Background technology

Large-scale iron and steel works adopt the heavy hot-metal car of torpedo jar type for satisfying the molten iron transportation more, and its car body deadweight is 280T, and weight can reach 600T after adding headstock and filling molten iron, and the circuit rail need adopt the 60kg/m heavy rail.For satisfying the transport demand of torpedo pot iron waterwheel, the essential maximum load capacity that improves railway bed.The above-mentioned heavy hot-metal car equipment of traveling on the railway bed of ordinary construction because the bearing capacity of railway bed can not reach requirement, is prone to subgrade settlement, and causes " waveform " circuit, and transportation has brought hidden danger to molten iron; In addition, easy ponding place is easy to occur the local subsidence phenomenon under blast furnace, can not guarantee the reliability and the safety of BF Area work.In order to improve the maximum load capacity of railway bed, the design of railway bed and construction are vital.

Publication number is CN1460748, the Chinese invention patent application that open day is on December 10th, 2003 discloses general novel subgrade structure of a kind of road and rail and job practices thereof, this roadbed only is made of native compacted lift of element and affixed in the above reinforced concrete pavement layer, old soil layer is given birth in the source that plain native compacted lift is compacting layer by layer, the reinforced concrete pavement layer forms by the elongated reinforcing bar cast of forming grid is set in the concrete, the shrinkage joint is not stayed on the road surface, during construction to roadbed do not do deep-cut overhead, but the old soil structure of the typing that keeps primary landforms, to its compacting layer by layer.But the subgrade rating by this patent application method construction also can not reach the instructions for use of extra-heavy duty type molten iron haulage device far away.

The utility model content

In order to overcome existing drawback in the above-mentioned prior art, this paper provides that a kind of roadbed supporting capacity of utility model is strong, settling amount is little, the safe and reliable road structure that is used for heavy transport vehicle traveling.

In order to solve the problems of the technologies described above, the utility model is used for the technical scheme that the road structure of heavy transport vehicle traveling is achieved, this roadbed is made of the multilayer backfill layer that is arranged in the pit foundation, described multilayer backfill layer is by the 37 lime earth bed course that distributes from bottom to top, graded broken stone ash soil layer and cement stone stabilized zone, the thickness of described 37 lime earth layer is 200～400mm, described graded broken stone ash the thickness of the layer is 500mm, and the thickness of described cement stabilizing layer is 200～300mm.

The utility model is used for the road structure of heavy transport vehicle traveling, wherein, described 37 lime earth layer is formed by lime and the soil system of mixing, its lime is 3:7 with the weight ratio of soil, the index of plasticity of described soil is 16～24, described lime quality is more than the III level, and the water content of described 37 lime earth layer is 14%-18%.Described graded broken stone ash soil layer is formed through jolt ramming by lime, water and rubble, and the weight ratio of lime, water and rubble is 1:1:3; Described ballast grain sizes is 5-7cm, is 2.871 through the apparent density of the graded broken stone of jolt ramming ash soil layer, and tap density is 1.78, and loose bulk density is 1.582, and the void content under the compact state is 42.7%.Described cement stone stabilized zone is formed through the machinery system of mixing by cement, rubble, stone flour, water, sand; The weight ratio of described cement, rubble, stone flour, water, sand is 2:18:12:2:1.Described cement adopts 425# cement, and described rubble specification is 10mm-30mm, and described stone flour specification is 2mm-5mm; Described sand adopts machine-processed sand or river sand.

Compared with prior art, the beneficial effect that the utility model had is: because this road structure is a multilayer back-filling in layers structure, and the formation of every layer material adheres to specification, the supporting capacity of roadbed can reach 70MPa-90MPa, satisfy the requirement of travelling such as the heavy molten iron transport vehicle of 280T torpedo jar fully, its settling amount adheres to specification.

Description of drawings

Accompanying drawing is the sectional schematic diagram that utility model is used for the road structure of heavy transport vehicle traveling.

Be the explanation of main Reference numeral in the utility model Figure of description below:

1---cement stone stabilized zone 2---graded broken stone ash soil layer 3---37 lime earth bed course

4---rail 5---sleeper 6---ballast aggregates

The specific embodiment

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

The work progress of the utility model roadbed mainly comprises:

Excavation of foundation pit.The process sequence of excavation of foundation pit is: construction survey, and------earthwork evacuation---cubic metre of earth is handled (that is: determine to transport to other places fill or do spoir handle)---in land clearing in the recovery, skirt piles.That is: the technician is according to the site control point unwrapping wire, in the recovery, skirt piles, and circuit roadbed position, location; In roadbed land used and borrow pit scope, remove surface vegetation, foreign material, ponding, stasis of blood mud, table soil.Roadway excavation must conform to design and code requirement, is excavated to hole end design elevation, the design width; After excavation of foundation pit finishes, the clear end, roll with vibrating roller smooth, after can fill thing by the job practices backfill.

The roadway excavation degree of depth is with reference to construction plant soil property situation, and cutting depth is determined in geologic report that the base area department of surveying shows and the requirement of demand bearing capacity of foundation soil.If soil property is general soil, the excavation of foundation pit degree of depth is 1 to 1.2m, and thing is filled in the backfill of branch multilayer in pit foundation.

Be excavated to projected depth, infiltration arranged, form soft foundation as cheating the end, need follow according to on-site actual situations, continue to dig downwards dark, clear up fully substantially to the weak soil layer after, fill thing by the job practices backfill again,, cause the superstructure sedimentation to avoid occurring " spring soil " phenomenon.As cheat end infiltration seriously, can adopt jackstone to fill the method construction.Continue downwards to dig deeply, remove hole end stasis of blood mud, strengthen the draining dynamics, fill the cubic meter of stone at the end, foundation ditch hole that the ponding location is arranged, the height that rockfills will expose the ponding height is advisable, and attention must avoid occurring soft bullet phenomenon with loader with the stone compacting in the process of rockfilling.After finishing dealing with, again by the methods described herein construction.

The roadbed backfill.The construction of the utility model road structure is an example with three layers of backfill layer, comprises being arranged in the pit foundation, from top to bottom is distributed as successively: 1, cement stone stabilized zone 2, graded broken stone ash soil layer 3,37 lime earth bed course.The job practices that thing adopts the placement in layers compacting is filled in backfill, gives strict control at aspects such as the grating of filler and moisture content, and especially the bedding part must be by filling behind the design grating requirement employing equipment mix, and inspect the quality of each layer mix at any time by random samples.The filler of each backfill layer should be done geotechnique's experiment earlier, and comprise and hit reality, liquid, plastic limit, CBR value etc., every index must conform to standard.Hanging wire construction when filling runs into the slope section suddenly when 1: 5 highway section, must dig step and handle, and guarantee embankment center line, planeness, and technical indicators such as road camber conform to technology and code requirement.Each layer backfill in pine shop 200 to 300mm thick after, carry out vibroroller cmpacting with vibratory roller, and roll number of times and be no less than 6 times.Roll the available filling micromicrofarad in back that finishes and detect degree of compaction,, satisfy standard and designing requirement to guarantee measured values such as flexure, vertical section elevation, center line off normal, width, planeness, horizontal wall inscription, side slope.

When being backfilled to the superiors' cement stone stabilized zone, draining in a organized way for the benefit of, the stabilized zone surface needs to put the slope and handles, and the gradient can be 1%-3%, makes arch formula roadbed or single-pitch type roadbed.Concrete format surface can be determined according to position, on-the-spot gutter.As both sides ditch is arranged, can make arch formula roadbed, a side has ditch can make the single-pitch type roadbed.

As shown in drawings, the utility model road structure comprises above-mentioned three layers of backfill layer, wherein:

(1) cement stone stabilized zone 1 is made up of cement, rubble, stone flour, water, sand, and ratio is 2: 18: 12: 2: 1.Cement can adopt 425# cement, and the rubble specification is 10mm-30mm, and the stone flour specification adopts 2mm-5mm, and sand adopts machine-processed sand, river sand all can.Stir to need to mix system, control the percentage of mixing time, amount of agitation and water well with Mixing Machine.Because construction feed amount is big, can use agitator to mix the system filler.All will the time inspect by random samples in the system of mixing each batch spice, the finished product material intact to firm stirring tested again, can use after qualified.The thickness of this cement stone stabilized zone 1 is 200～300mm.

(2) graded broken stone ash soil layer 2 constitutes its lime: water by lime, what rubble of water: rubble=1: 1: 3, wherein, ballast grain sizes is 5 to 7cm, the graded broken stone layer should be closely knit stable, in order to prevent frost heave and wet soft, should control content and index of plasticity less than the 0.5mm particle.During wet and moist highway section, the 0.5mm granule content is mixed the ash amount for being not less than 8～12%.The technical indicator of controlling its graded broken stone ash soil layer is respectively apparent density 2.871, and tap density reaches 1.78, and loose bulk density 1.582, the void content under compact state after the jolt ramming are 42.7%.The thickness of described graded broken stone ash soil layer 2 is 500mm.

(3) 37 lime earth bed course is by lime: soil=form at 3: 7.The index of plasticity of soil is controlled at 16～24 scopes, select suitable lime, lime quality should reach more than the III level, and 7～10d concentrates and to clear up before use, the water supply volume of clearing up is controlled in 500～800kg/t scope, the lime after clearing up with dust not also not conglomeration be principle.With the preceding square hole screen that should cross 10mm.The quality of check backfill has no-sundries, whether requirement up to specification of particle diameter, and whether the water content of backfill is in control range; Adopt scarifying, airing or evenly mix as the water yield is higher as measures such as dry ground; Adopt the moistening measure that waits of sprinkling water in advance in case of water content is on the low side.In addition, 37 lime earth is transported into the job site for stirring outside the venue, stir, and solid colour, the dirt proportioning is strict with designing requirement; Usually moisture measurement is held dirt with hand agglomeratingly, and two to refer to gently pinch be broken being advisable, i.e. and " hold agglomerating, land and bloom ", the optimum value of water content is 14%-18%.Place Min layers soil, the earth material of raking use the cohesive soil that newly digs out, and contained fragment, turf and organic impurities must not be greater than 8% in the cohesive soil; Should clear up before using and sieve, must not accompany the quicklime of not slaking, its particle diameter is not more than 15mm.The thickness of described 37 lime earth bed course 3 is 200～400mm.

Above backfill layer material must strictness be controlled the grating of each layer raw material well, the water content of finished product material, and the degree of compaction during construction, and these three indexs are keys that can roadbed reach the maximum load capacity requirement.Therefore, when selecting materials, mixing system, construction, must operate in strict accordance with designing requirement.

Application example one: in Wuhan iron and steel works on-site transportation route, adopt the utility model roadbed construction method, be used for the traveling of the heavy molten iron transport vehicle of 280T torpedo jar, its circuit always is about 8km, according to soil property report and code requirement around the circuit, shown in above-mentioned accompanying drawing, determine that it is 1.2m deeply that roadbed design is dug, wherein the thickness of each backfill layer is respectively: cement stone stabilized zone 1 is 300mm, graded broken stone ash soil layer 2 is 500,37 lime earth bed course 3 is 400mm, it is selected materials, finished product system of mixing and construction are all finished as stated above, then, on cement stone stabilized zone 1, lay the honest and kind slag 6 of 400mm successively and symmetrically, sleeper 5 and rail 4 are so far finished the railway of the heavy molten iron transport vehicle of 280T torpedo jar walking system.Survey unit testing through design and ground, this bearing capacity of foundation soil reaches 70MPa-90MPa, satisfies the requirement of travelling of torpedo jar heavy type molten iron transport vehicle fully, and apart from 13 months the present, its bulk settling amount adhered to specification in 100mm.

Application example two: at present, the Tianjin Iron Plant torpedo jar walking system of Hot work in progress, engineering quantity always is about 6km, adopts said method to utilize the utility model road structure.

Although in conjunction with the accompanying drawings the utility model has been carried out foregoing description; but the utility model is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment only is schematic; rather than it is restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; under the situation that does not break away from the utility model aim, can also make a lot of distortion, these all belong to the row of protection of the present utility model.

Claims (1)

1. road structure that is used for heavy transport vehicle traveling, constitute by the multilayer backfill layer that is arranged in the pit foundation, it is characterized in that: described multilayer backfill layer is by the 37 lime earth bed course that distributes from bottom to top, graded broken stone ash soil layer and cement stone stabilized zone, the thickness of described 37 lime earth layer is 200～400mm, described graded broken stone ash the thickness of the layer is 500mm, and the thickness of described cement stabilizing layer is 200～300mm.

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