CN1055568A - Acid water-glass pulp for fine sand stratum - Google Patents
Acid water-glass pulp for fine sand stratum Download PDFInfo
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- CN1055568A CN1055568A CN 90100275 CN90100275A CN1055568A CN 1055568 A CN1055568 A CN 1055568A CN 90100275 CN90100275 CN 90100275 CN 90100275 A CN90100275 A CN 90100275A CN 1055568 A CN1055568 A CN 1055568A
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- slurries
- water
- acid
- water glass
- sulfuric acid
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Abstract
A kind of acid water-glass pulp for fine sand stratum.These slurries are that 25～35% water glass, 4.5～6.5% sulfuric acid, 0.1～1.5% acetic acid (or content is 0.1～1.0% sodium acid carbonate) and 57～70% water are formed by content.This slurries good stability can adopt single liquid to inject.These slurries can be adjusted according to the stratum acid-base value, solidify in the given time with assurance.The permeability of water glass in fine sand is fine.Usually every cube of slurries can fixed sand body 4.2～4.8 meters
3Slurry intensity can be adjusted in 0.1～1.5MP scope, to satisfy various requirement of engineering.The slurries consolidated sand strength is stable, and under moisture conditions, intensity does not reduce.
Description
The invention belongs to the improvement of injecting paste material for building.
In the subway construction process, often run into the fine sand layer earth formation.Stratum as Beijing Metro is fine sand layer.In this stratum, mostly be lentoid and occur.Easily cave in during excavation.For the reinforcing fine sand layer, usually, can inject following several slurries:
1, the cement grout of band particle, this slurries are difficult to inject;
2, organic class chemical grout, this slurries ratio are easier to inject, but cost an arm and a leg, and be not suitable for large volume and reinforce, and contaminated environment;
3, chrome lignin slurries, this slurries are poisonous, should not use;
4, water glass slurries are as water glass-calcium chloride slurries, water glass-sodium aluminate pulp.In these slurries, the complex process that has, the injecting paste material that has is in great shortage, also has stronger alkaline pollution.Thereby the fine sand layer consolidation grouting has become the difficult problem in the construction of subway hidden construction process.Reinforce problem if solve bad fine sand layer, just can not guarantee the construction safety of tunneling subway conscientiously.
The basic principle of water glass injection slurry:
The water glass slurries divide two kinds of acidic water glass slurries and alkaline water glass pulps.The relation of the setting time of water glass and the pH value of its solution is seen Fig. 1.
As can be known from Fig. 1: solidifying of water glass can be divided into three districts, i.e. acidic region, differential gap and basic region.The fastest with the differential gap gelling.
Because the differential gap gelling is too fast, slurry infiltration ability extreme difference.Can only take two fluid grouting to implement.Basic region water glass, because of the solution-off of sodium ion, fixed crystal is very easily defeated and dispersed.Not only consolidated sand strength is low, and strong alkali stripping is arranged, and causes environment pollution therefrom.Acidic region water glass exists because polymer is poly silicic acid form, and not only the consolidated sand strength height is water insoluble, and stable performance.Under similarity condition, it is higher 5～10 times than the consolidated sand strength of alkaline water glass, is a kind of more satisfactory slurries of generally acknowledging both at home and abroad at present.
But for a long time, since problems such as the compound method of acidic water glass, grouting process be not resolved.Therefore, also well do not used at present.
The invention provides a kind of fine sand layer acidic water glass slurries.In these slurries, added a certain amount of retarding agent, make it delay hardening time in sand.This slurry infiltration is fine, and peripherad diffusivity is almost equal.Permeate more even.These slurries the preparation solidification process in, water-soluble Na
2SO
4Be included in the gelinite, after chance water oozes out, do not carry or seldom carry SiO
2Therefore, the intensity of solid sand body can not reduced.Through the evidence of institute of Henan water-saving section: acidic water glass soaks 3 years 04 months in water after, the compressive strength of its compressive strength during near 28 days.By 8 meters and 19 meters head osmotic pressures 3 months and 7 months.The intensity of its compressive strength rate in the time of 28 days is also high.At present, the test specimen through the test of 7 years is also excellent.Therefore, the going down of intensity of the solid sand body of acidic water glass slurries is very slowly.
The present invention adopts following material; And prepare by following percentage by weight:
Water glass: 25～36%
Sulfuric acid: 4.5～6.5%
Acetic acid: 0.12～0.4%(sodium acid carbonate 0.07～0.1%)
Water: 58～70%
The process for preparation of injection slurry:
At first water is diluted to 10～20Be ' with water glass.Then, water becomes Dilution of sulphuric acid 17～32% dilute sulfuric acid.In the 3rd step, the sulfuric acid after acetic acid and the dilution is mixed into mixed acid.The water glass for preparing is added in the diluted acid that dilute sulfuric acid and acetic acid mixes, stir, make PH=3～4.5.Shared percentage by weight is as mentioned above in slurries for every kind of material.
The another kind of process for preparation of slurries:
Water is diluted to 10～20Be ' with water glass.Then, water becomes Dilution of sulphuric acid 17～32% dilute sulfuric acid.Water glass after the dilution is added in the dilute sulfuric acid.When pH value near 2 the time, transfer to PH=3～4.5 with dilute solution of sodium bicarbonate.The percentage by weight of every kind of material in slurries as mentioned above.
Embodiment 1:
At first water is diluted to 20Be ' with water glass.Then, water becomes Dilution of sulphuric acid 30% dilute sulfuric acid.In the 3rd step, the sulfuric acid after acetic acid and the dilution is mixed into mixed acid.The water glass for preparing is added in the diluted acid that dilute sulfuric acid and acetic acid mixes, stir, make PH=3～4.5.Shared percentage by weight is as mentioned above in slurries for every kind of material.
Embodiment 2:
Water is diluted to 15Be ' with water glass.Then, water becomes Dilution of sulphuric acid 25% dilute sulfuric acid.Water glass after the dilution is added in the dilute sulfuric acid.When pH value near 2 the time, transfer to PH=3 with dilute solution of sodium bicarbonate.The percentage by weight of every kind of material in slurries as mentioned above.
The present invention compared with prior art has the following advantages:
1, the pulp stability for preparing is good, can adopt single liquid to inject;
2, these slurries can be adjusted according to the stratum acid-base value, solidify in the given time with assurance;
3, the permeability of waterglass in fine sand is fine, and peripherad diffusivity is almost equal, permeates more even. Usually, every cube of slurries can fixed sand body 4.2～4.8 meters3;
4, slurry intensity can be adjusted in 0.1～1.5MP scope, to satisfy various requirement of engineering;
5, the slurries consolidated sand strength is stable, and under moisture conditions, intensity does not reduce.
Claims (3)
1, a kind of fine sand layer acidic water glass slurries is characterized in that: these slurries are that 25～35% water glass, content are that 4.5～6.5% sulfuric acid, content are that 0.1～1.5% acetic acid (or content is 0.1～1.0% sodium acid carbonate) and 57～70% water are formed by content.
2, a kind of compound method of fine sand layer acidic water glass slurries, it is characterized in that: at first water is diluted to 10～20Be ' with water glass, water is with the dilute sulfuric acid of Dilution of sulphuric acid to 17～32% then, the 3rd step, sulfuric acid after acetic acid and the dilution is mixed into mixed acid, the water glass for preparing is added in the diluted acid that dilute sulfuric acid and acetic acid mixes, stir, make PH=3～4.5, every kind of material shared percentage by weight in slurries is: water glass: 25～36%; Sulfuric acid: 4.5～6.5%; Acetic acid: 0.12～0.4%; Water: 58～70%.
3, a kind of another kind of compound method of fine sand layer acidic water glass slurries, it is characterized in that: water is diluted to 10～20Be ' with water glass, and then, water becomes 17～32% dilute sulfuric acid with Dilution of sulphuric acid, and the water glass after the dilution is added in the dilute sulfuric acid.When pH value near 2 the time, transfer to PH=3～4.5 with dilute solution of sodium bicarbonate, the percentage by weight of every kind of material in slurries is: water glass: 25～36%; Sulfuric acid: 4.5～6.5%; Sodium acid carbonate: 0.07～0.1%; Water: 58～70%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90100275 CN1055568A (en) | 1990-04-12 | 1990-04-12 | Acid water-glass pulp for fine sand stratum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90100275 CN1055568A (en) | 1990-04-12 | 1990-04-12 | Acid water-glass pulp for fine sand stratum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1055568A true CN1055568A (en) | 1991-10-23 |
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ID=4876566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90100275 Pending CN1055568A (en) | 1990-04-12 | 1990-04-12 | Acid water-glass pulp for fine sand stratum |
Country Status (1)
| Country | Link |
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| CN (1) | CN1055568A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1043262C (en) * | 1992-07-24 | 1999-05-05 | 强化土工程株式会社 | Ground impregnating method |
| CN102757213A (en) * | 2012-07-26 | 2012-10-31 | 石家庄铁道大学 | Side slope grouting slurry for silty-fine sand embankment widening and method for preparing same |
-
1990
- 1990-04-12 CN CN 90100275 patent/CN1055568A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1043262C (en) * | 1992-07-24 | 1999-05-05 | 强化土工程株式会社 | Ground impregnating method |
| CN102757213A (en) * | 2012-07-26 | 2012-10-31 | 石家庄铁道大学 | Side slope grouting slurry for silty-fine sand embankment widening and method for preparing same |
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| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |