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Flowing backfill and preparation and construction method thereof

A fluidized backfilling and backfilling technology, which is applied in filling, construction, roads, etc., can solve the problem that compaction machinery cannot enter the compaction section for backfilling construction, etc., and achieve the effect of wide range of use, simple materials and simple construction technology.

Inactive Publication Date: 2010-10-13
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of backfill construction in road engineering and civil engineering where compaction machinery cannot enter or the backfill material is not easy to be compacted, and to provide a fluidized backfill material that can achieve self-compacting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] During the subgrade construction of an expressway, the backfill space of some bridges and culverts is narrow, and compactors cannot enter.

[0050] Construction materials: The cement used is ordinary Portland cement with a strength grade of 42.5; the water is potable tap water; the soil is the local excavation spoil. After inspection, according to the classification standard (DBJ01-501-92), the soil is clay Silt, organic matter content <2%, mass percentage of 20% passing through a sieve hole size of 0.074mm, water content of 2.2%.

[0051] construction process:

[0052] 1) Clean up the foundation pit.

[0053] 2) Determine the construction mix ratio. The selected mix ratio is: 100 parts of cement, 668 parts of soil, and 322 parts of water. According to the water content of the soil, the construction mix ratio is determined as: 100 parts of cement, 683 parts of soil, and 307 parts of water.

[0054] 3) On-site mixing. Use a small concrete mixer to mix the fluidized b...

Embodiment 2

[0059] The backfilling construction of the bridge and culvert abutment of an expressway has a narrow space and compaction machines cannot enter.

[0060] Construction materials: The cement used is ordinary Portland cement with a strength grade of 42.5; the water is potable tap water; the soil is the excavated soil of the project. After inspection, according to the classification standard (DBJ01-501-92), the soil belongs to Clay silt, organic matter content <2%, mass percentage of 92.5% passing through a sieve size of 0.074mm, water content of 2.5%.

[0061] construction process:

[0062] 1) Clean up the foundation pit.

[0063] 2) Determine the construction mix ratio. The selected mix ratio is: 100 parts of cement, 500 parts of soil, and 250 parts of water. According to the water content of the soil, the construction mix ratio is determined as: 100 parts of cement, 513 parts of soil, and 237 parts of water.

[0064] 3) On-site mixing. Use a small concrete mixer to mix the ...

Embodiment 3

[0069] The backfilling construction of the bridge and culvert abutment of an expressway has a narrow space and compaction machines cannot enter.

[0070] Construction materials: The cement used is ordinary Portland cement with a strength grade of 42.5; the water is potable tap water; the soil is the excavated soil of the project. After inspection, according to the classification standard (DBJ01-501-92), the soil belongs to Clay silt, organic matter content <2%, mass percentage of 91% passing through a sieve hole size of 0.074mm, water content of 2.4%.

[0071] construction process:

[0072] 1) Clean up the foundation pit.

[0073] 2) Determine the construction mix ratio. The selected mix ratio is: 100 parts of cement, 1000 parts of soil, and 450 parts of water. According to the water content of the soil, the construction mix ratio is determined as: 100 parts of cement, 1024 parts of soil, and 426 parts of water.

[0074] 3) On-site mixing. Use a small concrete mixer to mix...

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Abstract

The invention relates to a flowing backfill, belonging to the field of civil engineering. The flowing backfill comprises the following components by weigh part: 100 parts of cement, 500-1000 parts of soil and 250-450 parts of water, wherein the ratio of the cement and the soil is controlled between 0.1 and 0.2, and the ratio of the water and a solid material is controlled between 0.41 and 0.43. A construction method of the flowing backfill comprises the following steps: firstly, clearing a foundation pit; secondly, preparing the flowing backfill according to the requirements; finally, carrying out on-site pouring and maintaining, wherein the pouring of the flowing backfill can be pumped or filled in the specified position by the diversion of sliding grooves without compacting or vibrating, and after completing the pouring, the flowing backfill needs to be covered with alpine meadow soil to be maintained for over 24h before allowing vehicles and pedestrians to pass through. The flowing backfill provided by the invention has the characteristics of self-compacting, environmental protection, economy, adjustable strength and the like, and is suitable for bridge abutment backfill, road widening subgrade backfill, underground engineering and pipeline construction backfill and the backfill of construction foundation pits with narrow operating space and the like.

Description

technical field [0001] The invention belongs to the field of civil engineering, and in particular relates to a novel civil engineering material. The material is especially suitable for backfilling of bridges and culverts, backfilling of road widening subgrades, backfilling of underground engineering and pipeline engineering, and backfilling of small building foundation pits. technical background [0002] During the road operation period, due to the different settlements of the backfill soil on the back of the abutment and the bridge deck, the joint between the road surface and the bridge deck cracks, forming a road surface with different heights, and vehicles jump and impact when passing, which causes additional damage to the bridge culvert and the road surface The impact load makes the driver and passengers feel bumpy and uncomfortable, and even causes the vehicle to decelerate sharply, which can lead to serious traffic accidents. This phenomenon is called bridge head jumpi...

Claims

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Application Information

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IPC IPC(8): C04B28/04E02D17/18E01C3/00E01D21/00
Inventor 张金喜金珊珊范猛
Owner BEIJING UNIV OF TECH
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