A Construction Method of Loose Accumulation Body and Large Inclined Rock Face Foundation on Steep Slope

Abstract

The invention discloses a construction method of a large inclined rock surface foundation of a loose accumulation body of a steep slope. The construction method is characterized by comprising the following steps in sequence that firstly, the loose accumulation body in the range of a bridge foundation construction site is excavated and removed, and meanwhile, a buffer platform is arranged; the part, higher than the bearing platform bottom elevation and in the range of a bearing platform, of the large inclined rock surface is excavated to the bearing platform bottom elevation; the part, lower than the bearing platform bottom elevation and in the range of the bearing platform, of the large inclined rock surface is excavated into steps; a retaining wall is constructed to the bearing platform bottom elevation on the slope foot position of the loose accumulation body of the steep slope, backfilling is carried out on the excavated steps in a layered mode, and a pile foundation steel casing issimultaneously arranged in a buried mode; and filling is continuously carried out until the elevation of the buffer platform is reached to form a construction platform, a gantry crane and a drillingrig are installed, the bridge foundation construction is carried out, wherein the bridge foundation construction includes the construction of a pile foundation, after the pile foundation constructionis completed, excavation is carried out to the bearing platform bottom elevation, a pile head is removed, and finally construction of the bearing platform is carried out.

Description

technical field [0001] The invention relates to the technical field of bridge foundation construction, in particular to a method for constructing a steep slope loose accumulation body with a large inclined rock face foundation. Background technique [0002] my country's infrastructure construction is booming, and it is known as the "infrastructure madman". In particular, bridge engineering has made brilliant achievements, and it can build "tall, large, difficult, refined, sharp, and special" bridges under various complex conditions. Some bridges spanning large rivers are sometimes chosen to be built in the unfavorable environment of steep slopes with loose accumulations and large inclined rock faces due to limited conditions. To carry out bridge foundation construction under such conditions, it is first necessary to deal with loose accumulations and provide a bridge foundation construction platform. The method of erecting steel platforms is usually adopted after clearing lo...

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Problems solved by technology

The method of erecting steel platforms is usually adopted after clearing loose accumulations first, but this method is difficult to construct due to site constraints under steep slope conditions, and it is difficult to accurately locate and lay steel pipe pile foundations and steel casings in the case of large inclined rock faces. Income, the comprehensive cost is also very high

If the construction method of excavating the platform after grouting with steel pipes is used to stabilize the loose accumulation, the grouting volume will be large, the grouting period will be long, and the grouting effect will be difficult to control. At the same time, the load of the loose accumulation will be increased, which will increase the adverse risks. , it is also more difficult to excavate after grouting

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