A method for treating dry silty fine sand foundation with water injection graded sand and gravel concrete
A technology of grading sand and concrete, applied in soil protection, infrastructure engineering, construction, etc., can solve the problems of low foundation bearing capacity and inability to meet the requirements of building bearing capacity, and achieve the effect of improving the bearing capacity of the foundation
Active Publication Date: 2016-05-18
南通市裕成建设有限公司
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Problems solved by technology
The bearing capacity of the foundation in this area is seriously low, unable to meet the building bearing capacity requirement of not less than 180KPa
Method used
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Embodiment Construction
[0016] The following examples are only used to illustrate the present invention, but not to limit the protection scope of the present invention.
[0017] A method for treating dry silty fine sand foundation with water injection graded sandstone concrete of the present invention comprises the following steps:
[0018] a. According to 1:1 grading excavation, 1:1 grading means that the width from the base to the top of the slope is equal to the depth of the foundation pit, that is, grading at an angle of 45 degrees. First, dig the soil to a depth of 4.8-5.2m. According to the actual situation, the excavation depth is the best when it is excavated to 5 meters, and then the trench is cleaned and leveled;
[0019] b. After the bottom of the foundation pit is leveled, lay a layer of 300mm thick graded sand and gravel on it, and after pressing it once, insert the lower half of the prefabricated concrete awl with a diameter and height of 300mm into the graded sand and gravel. The inser...
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Abstract
The invention discloses a dry powder fine sand foundation processing method through water injection graded sand and stone concrete. The method includes the following steps that excavation is performed in a slope settling mode according to the ratio of 1:1, and grooves are cleared and leveled; after the bottom of a foundation pit is leveled, a layer of graded sand and stone is laid on the bottom, after rolling, a plurality of prefabricated concrete awls are inserted into the graded sand and stone by three fourths depth, and then a road roller is used for rolling until the round bottoms of the awls are flush with the plane of the graded sand and stone; the water content of graded sand and stone replacement is controlled to be 8-12%; the graded sand and stone replacement is spread in a layered mode, each layer of the graded sand and stone replacement is rammed at least three times, or the layers can be rolled compact through the road roller. After each layer of the graded sand and stone replacement is rammed compact, cutting ring sampling is carried out, the dry density of the graded sand and stone replacement layer is measured, and replacement of the upper layer is carried out after the dry density meets the requirement; finishing and leveling is carried out. Foundation replacement is performed in the external expansion range of a construction foundation and outer edge lines, graded sand and stone replacement processing is adopted and combined with a wet ramming technology, the bearing capacity of a powder fine sand foundation is improved, and the bearing capacity requirement, not smaller than 180 KPa, of the construction foundation is met.
Description
technical field [0001] The invention relates to a method for treating dry silty fine sand foundation with water injection graded sandstone concrete. The utility model belongs to the construction field of graded gravel foundation treatment. Background technique [0002] After the earthwork excavation, the soil survey and slope wall stability inspection on the site found that the site soil was loose, the moisture content was low, and the surface was sandy after excavation in some areas. The surface was fine sandy plain fill, and the soil below it Single silt and fine sand, personnel found that the standing part of the foot was obviously subsidence during the inspection process. The foundation bearing capacity of this area is seriously low, which cannot meet the building bearing capacity requirement of not less than 180KPa. Therefore, it is necessary to provide a new technical solution to solve the above problems. Contents of the invention [0003] In order to solve the ab...
Claims
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IPC IPC(8): E02D3/00E02D3/08
Inventor 姜博昱倪玉梅姜雪岐李春桥
Owner 南通市裕成建设有限公司