CN103628363B - Construction method for filling and building subgrade by using silty-fine sand as filling materials - Google Patents
Construction method for filling and building subgrade by using silty-fine sand as filling materials Download PDFInfo
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Abstract
The invention relates to a construction method for filling and building a subgrade by using silty-fine sand as filling materials. The construction method comprises the following steps that (1) a railway subgrade bed is subjected to edge covering by adopting filling materials in groups A and B, concretely, the filling materials in groups A and B with the horizontal width being 2.0m are adopted for filling and building at the two sides of the subgrade body under the subgrade bed, the silty-fine sand is adopted for filling and building in the middle, and a crawler type bulldozer is adopted for compact compression; (2) the subgrade bed is filled and built by adopting modified soil or qualified filling materials in groups A and B. The construction method has the advantages that the silty-fine sand is reasonably utilized, the engineering manufacturing cost is reduced, the defect caused by the subgrade filling and building by the silty-fine sand is overcome, the construction operability is high, the large-area construction is convenient, and the construction progress requirements can be ensured.
Description
Technical field
The present invention relates to a kind of civil engineering construction method.Particularly a kind of powder fine sand roadbed filling construction technology and method.
Background technology
In railway engineering, highway engineering, municipal engineering, all to carry out a large amount of earth materials (or) gravel embankment.The filling construction of earth and stone material proportion in the engineering of these industries is very large, and the construction method of native stone reclamation work and quality, directly affect quality and the cost of corresponding engineering, construction technology theory and the method for therefore grasping earth rock placement engineering are extremely important.
Roadbed filling construction adopts qualified general filler (piece stone, rubble, gravel class filler in A, B group filler) conventionally, adopts layering, the construction technology process such as pave smooth, watering or airing, cal rolling (road roller), check visa, road surface and side slope shaping constructs.
Shen Xi Industrial Corridor flint hilllock is to Bohai Sea railway engineering, limited because investing, must employing fetch earth nearby (most of is nearby powder fine sand).Powder fine sand is C group filler, its fine particle content seldom, disproportionately graded.Adopt conventional roadbed filling construction, can not meet compacting criteria.
Summary of the invention
The object of this invention is to provide a kind of powder fine sand that utilizes as filler construction method for filling roadbed, the method strong operability, be convenient to large-area construction.
The object of the invention is to be achieved through the following technical solutions: a kind of powder fine sand that utilizes, as the filling roadbed construction method of filler, is characterized in that: construction sequence is as follows:
(1) railway bed bedding adopts A, B group filler bound edge below, and A, the B group filler that is specially the wide 2.0m of the following roadbed body of bedding both sides employing level fills, and the middle powder fine sand that adopts fills, and adopts crawler dozer to carry out compacting;
Concrete steps are as follows:
(a) filling property analysis:
In construction soil field, sample soil carries out indoor particle analysis, determines that sample great soil group does not belong to A group filler, B group filler or powder fine sand, measures natural moisture content, grain density, minimax dry density;
(b) engineer testing: get a bid section (distance) as engineer testing section on construction line, engineer testing idiographic flow is: preparation of construction → base treatment → placement in layers → paving and leveling → turn airing → grinding compacting → check visa → roadbed to rebuild;
(b1) preparation of construction:
Powder fine sand fetches earth nearby, after a native sand adopts an excavator to dig out, stacks to the field of fetching earth and controls water, and after powder fine sand control water extremely flows out without open fire, with excavator loading, tipping truck is transported to test section job location; A, B are organized to filler to job location simultaneously;
(b2) base treatment:
Before test section construction, cleaning original ground foreign material, detect the natural bearing capacity of original ground, and bearing capacity will meet the parameter of construction requirement: static sounding specific penetration resistance P
svalue: I level railway is less than 1.2MPa, II level railway is less than 1.0MPa; Or natural ground Basic bearing ability σ
0: I level railway is less than 0.15MPa, and II level railway is less than 0.12MPa;
If bearing capacity does not meet the parameter of above-mentioned construction requirement, after original ground fills one deck A, B group filler, original ground bearing capacity is strengthened, and strengthened substrate is detected, until meet requirement for bearing capacity;
(b3) placement in layers:
Bound edge carries out with filling simultaneously: during bound edge, be to guarantee side slope width and compaction quality, emit the inside and outside sideline of bound edge every side widen 50cm and fill according to cross section; While filling out powder fine sand, for controlling the accuracy of loose laying depth, before back-up sand, on roadbed, with lime, draw grid, control loose laying depth;
(b4) paving and leveling:
Using bulldozer to coordinate manually paves to banketing, when in paving process, basis is determined loose laying depth in advance, plug in mark post height is grasped actual loose laying depth, after having paved, adopt level gauge to measure the filler elevation after paving, with pave before compare with ground level, calculate accurate loose laying depth;
(b5) turn airing:
According to test, while tentatively determining that powder fine sand moisture content is between 8～12%, detect coefficient of subgrade reaction K30 up to standard, therefore detect in time the moisture content of powder fine sand filler before paving and in paving process, when moisture content is greater than 12%, employing is revolved the crotch that ploughing or bulldozer carry and is turned airing, to control filler moisture content 8～12%;
(b6) roll:
Powder fine sand filler adopts SD22 type bulldozer to roll, and while rolling, the mode of taking vertical, horizontal to replace combination rolls, and after first pass longitudinal rolling, next laterally rolls all over adopting, and so hockets; Compacting order is according to first both sides, and roll rear centre; Bulldozer travel speed is no more than 4km/h; In construction paragraph junction, overlapping the rolling of palpus, longitudinal lap joint length is not less than 2m, the overlapping 10cm that is not less than of compacting bulldozer wheelmark between row and row; A, B group filler adopts road roller compacting;
(b7) compaction quality detects:
Powder fine sand filler adopts SD22 bulldozer vertical, horizontal in conjunction with rolling, and rolls the 6th time beginning, and often roll one time and detect relative density, coefficient of subgrade reaction, porosity and a moisture content, and record, technological parameter reference standard during as full bid section construction; When relative density, coefficient of subgrade reaction, porosity and moisture content reach construction reference, detect qualified after, complete this layer and roll, every layer is detected after qualified and repeats aforesaid operations again, carries out lower one deck construction;
(c) all fronts filling construction
By aforementioned (b) engineer testing step, obtain and fill device combination mode, number of rolling and roller compaction processes, the parameter of laying depth, water content and the powder fine sand filler of A, B group filler filler, in construction, carrying out filling construction completely: the construction method that adopts placement in layers, layered rolling during construction, it is to banket according to subgrade cross section overall with is longitudinal layered that horizontal slice is filled, every layer of both sides take A, B group filler to carry out bound edge, adopt bulldozer longitudinally to nappe and fill earth material, every layer of loose laying depth is no more than 40cm, adopts bulldozer and road roller to roll;
(d) check and accept
At every layer of placement grinding, reach after the definite number of rolling of scheme, for the following roadbed body of bedding powder fine sand filler, adopt relative density and coefficient of subgrade reaction K30 as compaction quality judgment criteria; For bound edge A, B group filler, adopt porosity and coefficient of subgrade reaction K30 as compaction quality judgment criteria;
(2) roadbed bottom, adopts conditioned soil or qualified A, B group filler to fill;
(3) subgrade bed top layer, adopts conditioned soil or qualified A, B group filler to fill.
Wherein in (b) engineer testing step, adopt crisscross the rolling of SD22 bulldozer to be generally 7 ~ 9 times, below loose laying depth 40cm.
Adopt this kind of debulking methods, for powder fine sand filler roadbed, can meet design and relevant acceptance criteria requirement.
Beneficial effect of the present invention: the present invention adopts such scheme, compares with construction method in the past, and tool has the following advantages:
1), overcome powder fine sand and directly filled out, compaction quality is difficult to the defect guaranteeing;
2), construct workablely, be convenient to large-area construction, can guarantee construction speed requirement;
3), engineering construction quality is guaranteed, and can meet the requirement of design and technical specification;
4), rationally utilize powder fine sand, reduce construction costs.
Accompanying drawing explanation
Fig. 1 is the roadbed section figure that adopts construction method of the present invention.
The specific embodiment
Note: the technical term relating in the application, as: A group, B group filler, conditioned soil, coefficient of subgrade reaction K30 etc. all come from the industry standard < < of People's Republic of China (PRC) railway bed design specifications > > (TB 10001-2005/J 447-2005), and whole construction and acceptance criteria are also with reference to this standard and relevant industries standard implementation.
1), subgrade bed part, adopt conditioned soil routinely dam filling construction fill.
2), bedding adopts A, B group filler bound edge below, A, the B group filler that is specially the wide 2.0m of roadbed body both sides employing level fills, the middle powder fine sand that adopts fills, emphasis is that powder fine sand roadbed adopts crawler dozer to carry out compacting.
In the present invention, emphasis is the following powder fine sand of bedding filling construction, introduces powder fine sand direct filling construction method below, carries out according to the following steps:
A), filling property analysis
In construction soil field, sample soil carries out indoor particle analysis, determine that sample great soil group does not belong to A group filler, B group filler or powder fine sand, measure natural moisture content, grain density, minimax dry density, when A group filler, B group filler or powder fine sand indices meet construction requirement, can carry out lower step operation.
B) engineer testing: get a bid section (distance) as engineer testing section on construction line, construction technology process is: preparation of construction → base treatment → placement in layers → paving and leveling → turn airing → grinding compacting → check visa → roadbed to rebuild.
B1), preparation of construction
Powder fine sand fetches earth nearby, considers that under soil site, water level is high, and the sand moisture content just having taken out is large, after a native sand adopts an excavator to dig out, stack to the field of fetching earth and control water, after powder fine sand control water extremely flows out without open fire, with excavator loading, tipping truck is transported to test section job location; A, B group fill source is far away, is transported to job location simultaneously.
B2), base treatment
Before test section construction, cleaning original ground crops root system weeds etc., detect the natural bearing capacity of original ground, and bearing capacity will meet the parameter of construction requirement: static sounding specific penetration resistance P
svalue: I level railway is less than 1.2MPa, II level railway is less than 1.0MPa; Or natural ground Basic bearing ability σ
0: I level railway is less than 0.15MPa, and II level railway is less than 0.12MPa;
If bearing capacity does not meet the parameter of above-mentioned construction requirement, after original ground fills one deck A, B group filler, original ground bearing capacity is strengthened, and strengthened substrate is detected, until meet requirement for bearing capacity.
B3), placement in layers
Bound edge carries out with filling simultaneously.During bound edge, be to guarantee side slope width and compaction quality, according to cross section, emit the inside and outside sideline of bound edge every side and widen 50cm and fill; While filling out powder fine sand, for controlling the accuracy of loose laying depth, before back-up sand, on roadbed, with lime, draw grid, control loose laying depth.
B4), paving and leveling
Using bulldozer to coordinate manually paves to banketing, when in paving process, basis is determined loose laying depth in advance, plug in mark post height is grasped actual loose laying depth, after having paved, adopt level gauge to measure the filler elevation after paving, with pave before compare with ground elevation, to calculate accurate loose laying depth.
B5), turn airing
According to test, while tentatively determining that powder fine sand moisture content is between 8～12%, detect coefficient of subgrade reaction K30 higher, meet construction reference, therefore detect in time the moisture content of powder fine sand filler before paving and in paving process, when moisture content is greater than 12%, adopts and to revolve the crotch that ploughing or bulldozer carry and turn airing, to control filler moisture content 8～12%.
B6), roll
Because fine sand cohesion is little, road roller is difficulty in walking in sand, and rolls in process and easily sand large area is thrown, and makes sand water loss, does not have compaction.Consider above factor, powder fine sand roadbed adopts SD22 type bulldozer to roll, and when this equipment rolls, crawler belt indentation is darker, and applicable sand rolls.Bound edge soil adopts road roller to roll according to a conventional method.
While adopting SD22 type bulldozer to roll, take the mode of vertical, horizontal combination to roll, after first pass longitudinal rolling, next laterally rolls all over adopting, and so hockets.Compacting order is according to first both sides, and roll rear centre.Bulldozer travel speed is no more than 4km/h.Each paragraph junction of constructing, overlapping the rolling of palpus, longitudinal lap joint length is not less than 2m, the overlapping 10cm that is not less than of compacting bulldozer wheelmark between row and row.
B7), compaction quality detects
Powder fine sand filler adopts SD22 bulldozer vertical, horizontal in conjunction with rolling, and rolls the 6th time beginning, and often roll one time and detect relative density, coefficient of subgrade reaction, porosity and a moisture content, and record, technological parameter reference standard during as full bid section construction; When relative density, coefficient of subgrade reaction, porosity and moisture content reach construction reference, in practical operation, conventionally adopt crisscross the rolling of SD22 bulldozer to be generally 7 ~ 9 times, detect each parameter and can reach standard, below loose laying depth 40cm.Detect qualified after, complete this layer and roll, every layer is detected after qualified and repeats aforesaid operations again, carries out lower one deck construction.
C), all fronts filling construction
By aforementioned b) engineer testing step, obtain the device combination mode of filling, number of rolling and roller compaction processes, A, the laying depth of B group filler filler, the parameter of water content and powder fine sand filler, in construction, carrying out filling construction completely: during construction, adopt placement in layers, the construction method of layered rolling, it is to banket according to subgrade cross section overall with is longitudinal layered that horizontal slice is filled, A is taked in every layer of both sides, B group filler carries out bound edge, adopt bulldozer longitudinally to nappe and fill earth material, every layer of loose laying depth is no more than 40cm, adopt bulldozer and road roller to roll according to the definite construction parameter of engineer testing.
D), check and accept
At every layer of placement grinding, reach after the definite number of rolling of scheme, for the following roadbed body of bedding powder fine sand filler, adopt relative density and coefficient of subgrade reaction K30 as compaction quality judgment criteria; For bound edge A, B group filler, adopt porosity and coefficient of subgrade reaction K30 as compaction quality judgment criteria.
The technological principle of this construction method:
Because sand grain content in powder fine sand soil earth is large, clay content is minimum, 85% particle mainly concentrates between particle diameter 0.25mm～0.075mm, caking property and moulding very little, adopts traditional road roller compacting, and its contact surface is less, road roller is difficulty in walking in sand, and roll in process and easily sand large area is thrown, make sand water loss, do not have compaction.Adopt SD22 type bulldozer to roll, this equipment self-weight is large and contact area is larger, can easily on sand, walk, and while rolling, crawler belt indentation is darker, and applicable sand rolls.Another emphasis is to control powder fine sand moisture content, controls rationally (between 8～12%) and can reach designing requirement.
Concrete application example: Shen Xi Industrial Corridor flint hilllock is to the construction of railways of the Bohai Sea, for guaranteeing Subgrade Construction Quality, solution roadbed filling fetches earth, and material source is far away, cost is high, powder fine sand constructional difficulties, be difficult to compacting, quality is difficult to many unfavorable construction problems such as assurance, incorporation engineering is actual, to the filling roadbed construction method of taking bound edge protection against erosion, adopting bulldozer to roll of powder fine sand, and tentatively by audit, the evaluation of these railway construction headquarter.Parallel testing result through self check and supervisor, fills quality and can reach design and demand of technical standard.This constructure scheme reduces fortune far away material for public use 7,100,000 sides, saves 31,950 ten thousand yuan of construction investments.Facts have proved, it is feasible adopting A, B group filler bag powder fine sand, adopting the construction method of bulldozer compacting.
Main construction equipment table in this constructure scheme is as follows:
| Machinery title | Model and specification | Unit | Quantity | Remarks |
| Excavator | CAT320B | Platform | 1 | ? |
| Bulldozer | SD22 | Platform | 2 | ? |
| Land leveller | PY160 | Platform | 1 | ? |
| Road roller | YZ20C | Platform | 1 | Original ground processing and bound edge soil pressure are real |
| Tipping truck | 18m 3 | ? | 6 | ? |
| Rotary plow | ? | Platform | 1 | ? |
| Sprinkling truck | 8t | Platform | 1 | ? |
Claims (2)
1. utilize powder fine sand as the filling roadbed construction method of filler, it is characterized in that: construction sequence is as follows:
(1) railway bed bedding adopts A, B group filler bound edge below, and A, the B group filler that is specially the wide 2.0m of the following roadbed body of bedding both sides employing level fills, and the middle powder fine sand that adopts fills, and adopts crawler dozer to carry out compacting;
Concrete steps are as follows:
(a) filling property analysis:
In construction soil field, sample soil carries out indoor particle analysis, determines that sample great soil group does not belong to A group filler, B group filler or powder fine sand, measures natural moisture content, grain density, minimax dry density;
(b) engineer testing: get a bid section as engineer testing section on construction line, engineer testing idiographic flow is: preparation of construction → base treatment → placement in layers → paving and leveling → turn airing → grinding compacting → check visa → roadbed to rebuild;
(b1) preparation of construction:
Powder fine sand fetches earth nearby, after a native sand adopts an excavator to dig out, stacks to the field of fetching earth and controls water, and after powder fine sand control water extremely flows out without open fire, with excavator loading, tipping truck is transported to test section job location; A, B are organized to filler to job location simultaneously;
(b2) base treatment:
Before test section construction, cleaning original ground foreign material, detect the natural bearing capacity of original ground, and bearing capacity will meet the parameter of construction requirement: static sounding specific penetration resistance P
svalue: I level railway is less than 1.2MPa, II level railway is less than 1.0MPa; Or natural ground Basic bearing ability σ
0: I level railway is less than 0.15MPa, and II level railway is less than 0.12MPa;
If bearing capacity does not meet the parameter of above-mentioned construction requirement, after original ground fills one deck A, B group filler, original ground bearing capacity is strengthened, and strengthened substrate is detected, until meet requirement for bearing capacity;
(b3) placement in layers:
Bound edge carries out with filling simultaneously: during bound edge, be to guarantee side slope width and compaction quality, emit the inside and outside sideline of bound edge every side widen 50cm and fill according to cross section; While filling out powder fine sand, for controlling the accuracy of loose laying depth, before back-up sand, on roadbed, with lime, draw grid, control loose laying depth;
(b4) paving and leveling:
Using bulldozer to coordinate manually paves to banketing, when in paving process, basis is determined loose laying depth in advance, plug in mark post height is grasped actual loose laying depth, after having paved, adopt level gauge to measure the filler elevation after paving, with pave before compare with ground level, calculate accurate loose laying depth;
(b5) turn airing:
According to test, while tentatively determining that powder fine sand moisture content is between 8～12%, detect coefficient of subgrade reaction K30 up to standard, therefore detect in time the moisture content of powder fine sand filler before paving and in paving process, when moisture content is greater than 12%, employing is revolved the crotch that ploughing or bulldozer carry and is turned airing, to control filler moisture content 8～12%;
(b6) roll:
Powder fine sand filler adopts SD22 type bulldozer to roll, and while rolling, the mode of taking vertical, horizontal to replace combination rolls, and after first pass longitudinal rolling, next laterally rolls all over adopting, and so hockets; Compacting order is according to first both sides, and roll rear centre; Bulldozer travel speed is no more than 4km/h; In construction paragraph junction, overlapping the rolling of palpus, longitudinal lap joint length is not less than 2m, the overlapping 10cm that is not less than of compacting bulldozer wheelmark between row and row; A, B group filler adopts road roller compacting;
(b7) compaction quality detects:
Powder fine sand filler adopts SD22 bulldozer vertical, horizontal in conjunction with rolling, and rolls the 6th time beginning, and often roll one time and detect relative density, coefficient of subgrade reaction, porosity and a moisture content, and record, technological parameter reference standard during as full bid section construction; When relative density, coefficient of subgrade reaction, porosity and moisture content reach construction reference, detect qualified after, complete this layer and roll, every layer is detected after qualified and repeats aforesaid operations again, carries out lower one deck construction;
(c) all fronts filling construction
By aforementioned (b) engineer testing step, obtain and fill device combination mode, number of rolling and roller compaction processes, the parameter of laying depth, water content and the powder fine sand filler of A, B group filler filler, in construction, carrying out filling construction completely: the construction method that adopts placement in layers, layered rolling during construction, it is to banket according to subgrade cross section overall with is longitudinal layered that horizontal slice is filled, every layer of both sides take A, B group filler to carry out bound edge, adopt bulldozer longitudinally to nappe and fill earth material, every layer of loose laying depth is no more than 40cm, adopts bulldozer and road roller to roll;
(d) check and accept
At every layer of placement grinding, reach after the definite number of rolling of scheme, for the following roadbed body of bedding powder fine sand filler, adopt relative density and coefficient of subgrade reaction K30 as compaction quality judgment criteria; For bound edge A, B group filler, adopt porosity and coefficient of subgrade reaction K30 as compaction quality judgment criteria;
(2) roadbed bottom, adopts conditioned soil or qualified A, B group filler to fill;
(3) subgrade bed top layer, adopts conditioned soil or qualified A, B group filler to fill.
2. a kind of powder fine sand that utilizes according to claim 1, as the filling roadbed construction method of filler, is characterized in that: in described (b) engineer testing step, adopt that SD22 bulldozer is crisscross to roll 7 ~ 9 times, below pine paving 40cm.
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| CN107503256A (en) * | 2017-07-12 | 2017-12-22 | 河海大学 | A kind of sandy soil improves filling roadbed construction method |
| CN107338686A (en) * | 2017-07-13 | 2017-11-10 | 高军 | A kind of Subgrade Filled Soil in High Speed Railway construction method |
| CN107653758A (en) * | 2017-08-18 | 2018-02-02 | 中交第四公路工程局有限公司 | Laterite bound edge wind-blown sand fill subgrade construction method |
| CN108532380A (en) * | 2018-05-09 | 2018-09-14 | 新疆铁道勘察设计院有限公司 | A kind of railway bed bedding cored structure of windy and sandy area |
| CN108570909B (en) * | 2018-05-15 | 2020-03-13 | 西南交通大学 | Filling and compacting method for fine sand roadbed |
| CN108867226B (en) * | 2018-07-20 | 2021-03-26 | 四川锦城智信建设工程有限公司 | Roadbed filling construction method for physically improving fine sand |
| CN109183541A (en) * | 2018-10-09 | 2019-01-11 | 中铁六局集团广州工程有限公司 | A kind of roadbed construction method and application using gravelly sand group material |
| CN109610244A (en) * | 2018-12-25 | 2019-04-12 | 四川天鑫达建筑工程有限公司 | The physically improved roadbed filling method of fine silt |
| CN110273428A (en) * | 2019-07-03 | 2019-09-24 | 中电建十一局工程有限公司 | It is a kind of using building waste as the construction method for filling materials |
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