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Treatment method for loess stratum road and bridge foundations

A treatment method and loess technology, applied in soil protection, infrastructure engineering, construction, etc., to achieve the effect of simple construction, large adjustable range, and strong durability

Inactive Publication Date: 2020-04-10
CHINA RAILWAY 21TH BUREAU GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of the common methods for the treatment of loess stratum foundations at present, and disclose a treatment method for road and bridge foundations in loess strata

Method used

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Embodiment Construction

[0015] Below in conjunction with embodiment the present invention is described in further detail:

[0016] a. Surveying and setting out: according to the foundation layout and pile position map, accurately determine the position of each construction pile point and make a mark. After the inspection is correct, the construction will be carried out and records will be made. The allowable deviation of the vertical and horizontal pile positions is ± 50mm;

[0017] b. Piling test: There are nine test piles in total, and three piles are a group. After testing, it is determined that the diameter of the hammer body is 40cm, the height is 1.5m, and the quality is 400kg. 0.45m, hole pile spacing 0.9m×1.0m, hole depth 9-15m, and then backfill semi-rigid mixed material layer by layer, the thickness of each lower layer is 30cm, each layer is rammed 8 times, the pile top height is 2m, each layer is rammed 16 times, the final tamping height exceeds the design pile top by 20-30cm;

[0018] c...

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Abstract

The invention discloses a treatment method for loess stratum road and bridge foundations. The treatment method for the loess stratum road and bridge foundations is characterized in that pile point positions are determined and the identification is completed; various construction parameters are determined through a pile forming test; mixture is subjected to weighing and stirring according to the matching ratio; a drilling machine is subjected to vertical correction according to the construction parameters; the construction parameters are measured in the drilling process; the mixture is backfilled in a drill hole in layered manner and is tightly and firmly knocked by a heavy hammer; a transverse drainage slope is arranged on the top surface of a closed bearing layer; and finally, quality detection is carried out to ensure that design requirements are met. According to the treatment method, a pile body is strong in durability, the rigidity of the pile body can be adjusted to be large, thedeformation of the pile body can be well coordinated with the deformation of foundation soil, the soil body surrounding the pile body and the pile is extruded tightly and is firm, the pile body mixture is not contracted after being coagulated and hardened, and the pile body can well adapt to common deformation and bearing upper load of the soil body; the pile top sealing bearing layer is in closecontact with the lower soil layer, the upper load is uniformly distributed, an effective and stable composite foundation bearing structure is formed, the better strength is achieved, the effective and stable composite foundation bearing structure can be synchronously deformed along with the foundation soil layer, and water flow infiltration is effectively prevented.

Description

technical field [0001] The invention relates to a method for treating road and bridge foundations, in particular to a method for treating road and bridge foundations in loess strata, and belongs to the field of road and bridge construction. Background technique [0002] The foundation treatment of road and bridge construction is a very important link. If the treatment is good, the shear strength of the foundation can be improved to meet the design requirements for the bearing capacity and stability of the foundation, improve the deformation properties of the foundation, and prevent excessive damage to the building. Settlement or uneven settlement and lateral deformation, etc., improve the permeability and seepage stability of the foundation, prevent excessive seepage and seepage damage, improve the seismic performance of the foundation, prevent liquefaction, isolate vibration and reduce the amplitude of vibration waves, etc. [0003] However, due to the disadvantages of low ...

Claims

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Application Information

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IPC IPC(8): E02D3/00E02D3/08
CPCE02D3/00E02D3/08
Inventor 陈向军赵彦旭段利宾潘亮李文江庄立普杨林海周庆强安浩民汪宗功魏存兰李文波杲斐裴有陆苏红岭
Owner CHINA RAILWAY 21TH BUREAU GROUP
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