A roadbed filling construction method with physical improvement of silt and fine sand

A construction method and powder fine sand technology, which is applied in roads, buildings, roads, etc., can solve the problems that the mixing ratio cannot be adjusted at will, the road mixing method is uneven, and the construction cost is high, so as to facilitate large-scale construction and improve Quality and the effect of reducing construction costs

Active Publication Date: 2021-03-26
四川锦城智信建设工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a roadbed filling construction method for physical improvement of silty sand, which solves the problem that the above-mentioned mixing ratio cannot be freely allocated; and overcomes the large construction cost of the centralized mixing method. , damage to the environment, and the defects of uneven mixing in the road mixing method; the mixing ratio can be adjusted flexibly, the mixed filler can be mixed evenly, and it has the advantages of low construction cost, simple construction and easy operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The subgrade filling construction method of physical improvement of silt and fine sand, the particle size of silt and fine sand is 0.3≥d>0.2mm, and the ratio of silt and fine sand: breccia is 1:1, including the following steps:

[0046] (1) Determine the mixing ratio of 1:1, transport the silt and fine sand and breccia to the backfill roadbed, unload the material by retreating, and form a silt and fine sand heap and a breccia heap respectively, and the space between the two filling heaps A site with a backhoe construction; use a backhoe to dig 1 part (1 shovel) of silt and fine sand and dump it on the blank site between the two filling piles, and then shovel and dig a part of breccia and dump it on top of the silt and fine sand , then pour a portion of silty sand on top of the breccia, pour a portion of breccia on top of the silty sand, and repeat this until the stacking amount reaches half of the layer of the filling layer; the thickness of each layer is 0.3m, Each lay...

Embodiment 2

[0058] The roadbed filling construction method of physical improvement of silt fine sand in embodiment 2, the particle size of silt fine sand is 0.2≥d>0.1mm interval, silt fine sand: round gravel soil is 1:1.5, and the specific operation steps are the same as those of embodiment 1 The difference is:

[0059] In step (1), the mixing ratio is 1:1.5. Use a backhoe to shovel 2 parts (2 shovels) of powder and fine sand and pour it on the blank space between the two filling piles, and then shovel and dig 3 parts of round gravel Pour over the silty sand, then pour 2 parts of silty sand over the round gravel, pour 3 parts of round gravel over the silt, repeat this until the stacking volume reaches 9m 3 So far, one-time admixture A is obtained;

[0060] In step (2), when preparing the primary admixture B, according to the mixing ratio, pour 3 parts of round gravel soil first, then pour 2 parts of powder and fine sand, and pour and pile repeatedly to obtain 9m 3 primary admixture B; ...

Embodiment 3

[0068] The roadbed filling construction method for the physical improvement of silt fine sand in embodiment 3, the particle size of silt fine sand is 0.2≥d>0.1mm interval, the ratio of silt fine sand: breccia is 1:2, and the specific operation steps are the same as those of embodiment 1 The difference is:

[0069] In step (1), the mixing ratio is 1:2, use a backhoe to dig out 1 part (1 shovel) of powder and fine sand and pour it on the blank space between the two filling piles, and then shovel and dig out 2 parts of breccia Pour over the silty sand, then pour 1 part of silty sand over the breccia, pour 2 parts of breccia over the silty sand, and repeat until the stacking volume reaches 9m 3 So far, one-time admixture A is obtained;

[0070] In step (2), when preparing the primary admixture B, according to the mixing ratio, first pour 2 parts of breccia, and then pour 1 part of fine sand, and pour and sprinkle repeatedly to obtain 9m 3 primary admixture B;

[0071] In step (...

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Abstract

The invention relates to the technical field of civil construction and specifically relates to a roadbed filling construction method for physical modification of silty-fine sand. The method comprisesthe following steps: sampling and analyzing the filler, determining the type of each filler, and measuring the filler characteristics; digging a first filler pile and a second filler pile respectivelyaccording to the mixing proportion, and stacking together in layers, to obtain the primary mixture A; repeating the operations to obtain the primary mixture B; digging the primary mixture A and the primary mixture B respectively, and stacking together in layers to obtain a secondary mixture; flattening and uniformly mixing the secondary mixture; rolling and flattening the secondary mixture to obtain a filling layer; performing acceptance inspection on the filling layer. The construction method provided by the invention solves the problem that the mixing proportion cannot be determined at will, and overcomes the defects of high construction cost and environmental damage of a centralized mixing method and non-uniform mixing of a road mixing method; moreover, the construction method realizesflexible adjustment of the mixing proportion and uniform mixing of the mixed filler, and has the advantages of low construction cost and easiness in construction and operation.

Description

technical field [0001] The invention relates to the technical field of civil construction, in particular to a roadbed filling construction method for physical improvement of fine sand. Background technique [0002] At present, in the construction of railway projects, silt and fine sand are often used as roadbed fillers. Silty fine sand is used as Group C filler, which can be used to backfill part of the subgrade below the bottom layer of the railway subgrade bed. However, some silty sand with poor gradation has no cohesion, loose particles, and the foundation coefficient is very small, which is far lower than the current specification requirements of the "Code for Design of Railway Subgrade" (TB 10001-2005 / J 447-2005) ; And, the construction equipment cannot operate on the silt fine sand backfill working face because of its heavy weight. [0003] In order to increase the particle size and gradation grade of silt fine sand, it needs to be improved. In the prior art, there ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01C3/04
CPCE01C3/04
Inventor 赵建勇
Owner 四川锦城智信建设工程有限公司
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