Research And Application Of Foam Light Soil In Ningbo,Zhongshan Road Pipeline Backfilling

Situ foam is light soil in the field of civil engineering in recent years developed a new type of lightweight filling material,which is stable materials necessary fillers,water,additives and foam mix prepared according to a certain proportion,through on-site transportation,casting,a light filler after curing formed.Ningbo,Zhongshan Road backfill pipe foam light soil for the first time in the trenches respect,not only for the development of lightweight soil provides a road,more new energy saving materials provide a direction.Foam light soil with its superior performance Ningbo municipal owners of all ages,the first large-scale,large-volume use of foam as a light soil of this transformation in the mountain trench backfill main backfill material.It also later when other coastal cities during backfilling trenches to provide a new means!In this paper,laboratory tests and engineering method of combining specific case,the foam material is applied to the light soil of new municipal road reconstruction trench backfill,the following major elements:?By domestic and foreign cast light soil foam application and Case and lightweight foam production process analysis soil quality factors obtained foam light soil,by the main factors and other factors.The main factor is the foam technology and hybrid technology as well as blowing agent,foaming agent and made on light soil properties and in-situ foam production equipment requirements and points to be controlled according to three main factors.?By foam light soil in time and space on the quality control namely:preparation of raw materials entering the pre-construction,equipment inspection,prior to construction quality acceptance before pouring the base control.Pouring process flow value of light soil,wet density testing as well as through different parts of the same specimen pouring density with altitude changes determined experimentally affected by the height at the time of casting light soil construction and other construction quality control.Based on the specific requirements of the bubble light soil conservation and other ancillary works and other convergence projects and the quality control measures taken afterwards after pouring completed.By using before,during and after the operation time up to cast light soil foam quality control to ensure the quality and safety of light soil in engineering.?Analysis of concrete examples.The foam light soil as a backfill material applied to the transformation of Ningbo in the mountain trench backfill.Because Ningbo located in the coastal high water table,the need for analysis of raw materials selection,in three ordinary Portland cement and rapid hardening cement head 0 unconfined complex absorption ratio test analysis.Vertical comparison obtained in coastal areas as far as possible rapid hardening cement,concrete mix to give horizontal comparison Ningbo pipeline backfilling.In accordance with the ratio of strict construction and settlement observation and analysis at the end of the project.Finally,after the construction of the benefit arising from this project to quantify and calculate summary.