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Lightweight foam soil for changing and filling special metro subgrade

A technology of subgrade replacement and lightweight foam, which is applied in the field of lightweight foam soil, can solve the problems of subway operation safety hazards, insufficient foundation bearing capacity, and inability to deal with it thoroughly, so as to ensure stability, good impact resistance, and technical Quality Guaranteed Effect

Inactive Publication Date: 2015-11-11
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

However, due to the extremely irregular distribution of underground cavities in karst areas and goafs, and the complex geology, the conventional methods are either expensive or cannot be dealt with thoroughly. The timely use of bridges to cross these sections is also due to the distribution of underground karst areas and goafs. The complexity of the pile foundation construction still has huge risks
[0005] In the field of subway filling construction, due to insufficient packing or excessive load, or insufficient foundation bearing capacity, or rainwater infiltration, etc., uneven settlement will pose a great safety hazard to the safety of subway operation. The conventional repair method is to damage the structure. Reinforcement, due to the addition of new loads, the total settlement after maintenance will further increase, entering a vicious circle of re-maintenance and subsidence

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The lightweight foam soil for the special subgrade replacement of the subway of the present invention is made of the following components by weight: 120 parts of cement, 60 parts of silica fume powder, 45 parts of diatomaceous earth, 105 parts of fly ash, 200 parts of water, 1 part of water reducer, 1 part of early strength agent, 0.0015 part of aluminum powder, 0.05 part of sodium gluconate, 5 parts of plant fiber, 5 parts of foaming agent, and 2 parts of microfoaming agent.

[0042] The cement in this embodiment is PO52.5 Portland cement.

[0043] The water reducer described in this embodiment is a naphthalene-based water reducer.

[0044] The early strengthening agent described in this embodiment adopts calcium chloride.

[0045] The foaming agent described in this embodiment is a HT composite foaming agent, and its components include animal protein and vegetable protein, and one or more of rosin soap, hydrogen peroxide and aluminum powder.

[0046] The microfoamin...

Embodiment 2

[0048] The lightweight foam soil for the special subgrade replacement of the subway of the present invention is made of the following components by weight: 300 parts of cement, 5 parts of silica fume powder, 5 parts of diatomaceous earth, 45 parts of fly ash, 100 parts of water, 5 parts of water reducing agent, 3 parts of early strength agent, 0.005 part of aluminum powder, 0.2 part of sodium gluconate, 25 parts of plant fiber, 12 parts of foaming agent, and 10 parts of microfoaming agent.

[0049] The cement in this embodiment is PO52.5R Portland cement.

[0050] The water reducer described in this embodiment is a naphthalene-based water reducer.

[0051] The accelerator described in this embodiment uses sodium sulfate.

[0052] The foaming agent described in this embodiment is a HT composite foaming agent, and its components include animal protein and vegetable protein, and one or more of rosin soap, hydrogen peroxide and aluminum powder.

[0053] The microfoaming agent de...

Embodiment 3

[0055] The lightweight foam soil for the special subgrade replacement of the subway of the present invention is made of the following components by weight: 210 parts of cement, 32 parts of silica fume powder, 85 parts of diatomaceous earth, 57 parts of fly ash, 60 parts of water, 3 parts of water reducer, 2 parts of early strength agent, 0.003 part of aluminum powder, 0.125 part of sodium gluconate, 15 parts of plant fiber, 10 parts of foaming agent, and 8 parts of microfoaming agent.

[0056] The cement in this embodiment is PO52.5R Portland cement.

[0057] The water reducer described in this embodiment is a naphthalene-based water reducer.

[0058] The accelerator described in this embodiment uses sodium sulfate.

[0059] The foaming agent described in this embodiment is a HT composite foaming agent, and its components include animal protein and vegetable protein, and one or more of rosin soap, hydrogen peroxide and aluminum powder.

[0060] The microfoaming agent describ...

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Abstract

The invention provides lightweight foam soil for changing and filling a special metro subgrade, relating to a building material. The lightweight foam soil for changing and filling the special metro subgrade is prepared from the following materials: cement, silica fume powder, diatomite, fly ash, water, a water reducing agent, an early strength agent, aluminium powder, sodium gluconate, plant fiber, a foaming agent and a micro foam agent. The lightweight foam soil is light, high in strength and good in overall performance, meets the need of the bearing capacity of a soil body of a soft soil area, also meets the need of the bearing capacity of the changed and filled subgrade per se on the load of the upper part, reduces the load of the special subgrade, and reduces subgrade settlement.

Description

technical field [0001] The invention relates to a building material, in particular to a lightweight foam soil for filling special subgrades of subways. Background technique [0002] Special subgrades refer to road subgrades built under unfavorable conditions such as unfavorable geological phenomena, special terrain and geological conditions, and some special climatic factors. Special subgrades may have various problems due to the breaking of natural balance conditions, too steep slopes, or low geological bearing capacity. Therefore, in addition to designing according to general subgrade standards and requirements, it is also necessary to target Special issues are studied and dealt with. [0003] The subway line passes through soft ground sections or karst areas. In order to improve the friction coefficient of the foundation and the bearing capacity of the foundation, ensure the safety of the foundation pit construction and prevent the danger caused by the foundation subside...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B28/00
Inventor 张建华李商宋昊罡孙根生唐璐许言言裴学果
Owner 河南华泰新材科技股份有限公司
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