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A lightweight foam soil used for backfilling foundation pits of subway stations

A lightweight foam and subway station technology, applied in the field of lightweight foam soil, can solve the problems that people and machines cannot work in the working space, affect the safety and service life of the subway, and cannot be backfilled compactly, so as to speed up the hydration speed, The pore size is uniform and independent, and the effect of enhancing compactness

Active Publication Date: 2018-02-23
河南华泰新材科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional backfilling process is likely to cause problems such as poor backfill soil quality, uncompact backfill, side slope collapse, and spring soil after collapse, which seriously affects the safety and service life of the subway
For some small underground spaces, such as around the track lines and stations architecture Foundation Pit and Underground plumbing The gaps around the surrounding area are difficult to be backfilled due to the inability of humans and machines to work or the working space is too narrow to backfill densely.

Method used

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  • A lightweight foam soil used for backfilling foundation pits of subway stations
  • A lightweight foam soil used for backfilling foundation pits of subway stations

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The lightweight foam soil applied to the backfilling of subway station foundation pits provided by the invention is made of the following raw materials in parts by weight: 250 parts of cement, 20 parts of diatomite, 35 parts of granulated blast furnace slag, 50 parts of fly ash, 120 parts of water, 0.5 parts of water reducer, 3 parts of inorganic omega fiber, 20 parts of plant fiber, 4 parts of foaming agent, and 1 part of microfoaming agent.

[0058] Wherein, the cement described in this embodiment adopts PO42.5 ordinary Portland cement; the fly ash is Class I fly ash, and the technical indicators of Class I fly ash meet those shown in Table 1, and will not be repeated here; The water reducer is a polycarboxylate water reducer; the foaming agent is a composite foaming agent, its components include animal protein and vegetable protein, and one or more of rosin soap, hydrogen peroxide and aluminum powder; The above-mentioned microfoam is prepared by diluting the foaming ...

Embodiment 2

[0060] The lightweight foamed soil applied to the backfilling of subway station foundation pits provided by the invention is made of the following raw materials in parts by weight: 400 parts of cement, 10 parts of diatomite, 5 parts of granulated blast furnace slag, 10 parts of fly ash, 200 parts of water, 1.25 parts of water reducer, 6 parts of inorganic omega fiber, 5 parts of plant fiber, 6 parts of foaming agent, and 5 parts of microfoaming agent.

[0061] Among them, the cement described in this example is PO42.5R ordinary Portland cement; the fly ash is Class I fly ash, and its technical indicators meet those shown in Table 1; the water reducer is polycarboxylate Water reducer; the foaming agent is a composite foaming agent, its composition includes animal protein and vegetable protein, and one or more of rosin soap, hydrogen peroxide and aluminum powder; the foaming agent is the foaming agent Diluted with water at 1:1500, and micro-foamed by plunger pump.

Embodiment 3

[0063] The lightweight foamed soil applied to the backfilling of subway station foundation pits provided by the invention is made of the following components by weight: 350 parts of cement, 12 parts of diatomaceous earth, 25 parts of granulated blast furnace slag, 5 parts of fly ash, 150 parts of water, 2 parts of water reducing agent, 8.5 parts of inorganic omega fiber, 15 parts of plant fiber, 5.5 parts of foaming agent, and 3 parts of microfoaming agent.

[0064] Among them, the cement described in this example is PO42.5R ordinary Portland cement; the fly ash is Class I fly ash, and its technical indicators meet those shown in Table 1; the water reducer is polycarboxylate Water reducer; the foaming agent is a composite foaming agent, its composition includes animal protein and vegetable protein, and one or more of rosin soap, hydrogen peroxide and aluminum powder; the foaming agent is the foaming agent Diluted with water at 1:1500, and micro-foamed by plunger pump.

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Abstract

The invention provides light foamed soil applied to backfill of a subway station foundation pit, and relates to building materials. The light foamed soil applied to the backfill of the subway station foundation pit is prepared from the following raw materials of cement, kieselguhr, granulated blast-furnace slag, coal ash, water, a water reducing agent, inorganic Aomi fiber, plant fiber, a foaming agent and a micro foaming agent. The light foamed soil provided by the invention is light in weight and high in strength, the whole performance is good, not only can the bearing capacity of a soil body in a soft soil area be met, but also the bearing capacity of an exchange filling foundation on upper load can be met, the load of a special subgrade is reduced, and the subgrade settlement is reduced.

Description

technical field [0001] The invention relates to a building material, in particular to a lightweight foam soil used for backfilling foundation pits of subway stations. Background technique [0002] Due to the complexity and historical nature of subway foundation pit engineering, and with the development of high-rise buildings and underground spaces, dense buildings, complex pipelines, and narrow sites have put forward higher technical and construction requirements for the backfilling of subway station foundation pits. The traditional backfilling process is likely to cause problems such as poor backfill soil quality, uncompact backfill, side slope collapse, and spring soil after collapse, which seriously affects the safety and service life of the subway. For some small underground spaces, such as around the track lines and stations architecture Foundation Pit and Underground plumbing The gaps around the surrounding areas have become a major difficulty in engineering constru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/02C04B28/04
Inventor 张建华吕文朴楚风尘杨玉宏李商岳志成柳健裴学果
Owner 河南华泰新材科技股份有限公司
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