CN104895044A - A liquefied foundation treatment device increasing the gas content of underground water and a construction method - Google Patents
A liquefied foundation treatment device increasing the gas content of underground water and a construction method Download PDFInfo
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- CN104895044A CN104895044A CN201510162750.3A CN201510162750A CN104895044A CN 104895044 A CN104895044 A CN 104895044A CN 201510162750 A CN201510162750 A CN 201510162750A CN 104895044 A CN104895044 A CN 104895044A
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Abstract
The invention provides a liquefied foundation treatment device increasing the gas content of underground water and a construction method. The liquefied foundation treatment device comprises water pipes, geotechnical cloth, an external use water suction pump and a gas generation device. The two water pipes are water pipes with holes and include a water suction pipe and a water inlet pipe; the geotechnical cloth is wrapped around the outer layers of the water pipes. The parts with holes of the water suction pipe and the water inlet pipe are located in a liquefied foundation. The water suction pipe, the external use water suction pump, the gas generation device and the water inlet pipe are connected successively and form a closed water flow system together with the liquefied foundation. The lift of the external use water suction pump is greater than the length of the water suction pipe, so that deep underground water of the water suction pipe can be pumped out. The external use water suction pump pumps underground water in the liquefied foundation out; the pumped underground water is charged with bubbles by the gas generation device; then the water is fed to the liquefied foundation through the water inlet pipe. The liquefied foundation treatment device can reduce the saturation of the liquefied foundation without damaging the foundation structure and wasting resources.
Description
Technical field
The invention belongs to civil construction project technical field, particularly a kind of liquefaction foundation treatment device and construction method increasing underground water air content.
Background technology
Liquefaction is one of first cause causing place earthquake damage, and seismic ground accident about 50% results from liquefaction.In recent years, China's earthquake disaster constantly occurred, and wherein sand liquefaction causes the heavy damage of road piping, underground construction, dykes and dams etc., causes the common concern of engineering circles.
The control of sand liquefaction is mainly from preventing the generation of sand liquefaction and preventing from or alleviate building differential settlement two aspect starting with.Comprise choose reasonable place; Take the measures such as punching, compacting, blast, compaction pile of shaking, improve sand density; Draining reduces sand pore water pressure; Soil removal and replacement, sheet pile seals, and adopts the methods such as globality good raft foundation, deep pile foundation, domestic the most frequently used in engineering be pile foundation facture.The shortcoming of these method general character is that cost is high, and on large area liquefied foundation, application charges is high.
Desaturation method is a kind of liquefaction foundation treatment method proposed in recent years, its general principle is the saturation ratio reduced by engineering measure in saturated sand foundation, saturated sand foundation is become undersaturated sand foundation, thus improve the liquefaction stress of ground, the liquefaction earthquake produced when alleviating earthquake.Research confirms, when the air content in underground water brings up to 5%, when namely ground saturation ratio is reduced to 95%, the liquefaction stress of sand is by raising 2 ~ 3 times.Desaturation method mainly comprises underground aeration, dewatering method etc. at present, and underground aeration will apply larger air pressure could be filled with bubble in ground deep, and the comparatively air applied can press splitting foundation soil body to cause foundation structure to damage; The method of dewatering then changes the stress state of ground, can cause the sedimentation of ground, and needs to take long-term measure could keep lower ground descending water level, adds the applicability of the method.
Summary of the invention
The present invention proposes a kind of liquefaction foundation treatment device increasing underground water air content, and object is: overcome existing underground aeration, dewatering method two kinds of desaturation methods produce damage defect to foundation structure.
The technical scheme that technical solution problem of the present invention is taked is:
Increase a liquefaction foundation treatment device for underground water air content, comprise water pipe, geotextiles, external application suction pump, gas generating unit, described water pipe is the water pipe with holes of outer layer covers geotextiles, has two, is respectively drinking-water pipe and water inlet pipe; Described, the holed part of drinking-water pipe and water inlet pipe is all placed in liquefied foundation, and drinking-water pipe and external application suction pump, gas generating unit, water inlet pipe, successively after flexible pipe is connected, form closed flow promoter system with liquefied foundation; Described external application suction pump, its lift is greater than the length of drinking-water pipe.
As preferred version of the present invention, described water pipe with holes is PVC plastic material, and diameter is 10 ~ 20cm, and thickness is 5 ~ 10mm, the hole diameter 3 ~ 8mm on water pipe with holes, and aperture pitch is 5 ~ 10cm.
As preferred version of the present invention, the bubble diameter that described gas generating unit produces is less than or equal to 100um.
As preferred version of the present invention, between drinking-water pipe and external application suction pump, be also provided with water body air content checkout gear.
Another object of the present invention is to, a kind of construction method increasing the liquefaction foundation treatment device of underground water air content is provided, comprises following technical step:
1) according to position and the degree of depth of liquefied foundation, part drinking-water pipe and water inlet pipe being positioned at liquefied foundation lays aperture;
2) be driven into liquefied foundation diverse location respectively by after drinking-water pipe and water inlet pipe geotextiles parcel, and ensure that the holed part of drinking-water pipe and water inlet pipe is all arranged in liquefied foundation;
3) drinking-water pipe, water body air content checkout gear, external application suction pump, gas generating unit are connected by flexible pipe successively with water inlet pipe, form closed flow promoter system with liquefied foundation;
4) open water body air content checkout gear, external application suction pump and gas generating unit simultaneously, external application suction pump extracts the underground water in liquefied foundation, bubble is injected the ground water suction extracted by gas generating unit, underground water with bubble recharges liquefied foundation by water inlet pipe, and the underground water in liquefied foundation is circulated between drinking-water pipe, gas generating unit, water inlet pipe;
5) by water body air content checkout gear, the underground water air content extracted is analyzed, when air content in underground water is more than 5%, stops pumping and intake;
6) regularly repeat step 1 ~ 5, keep ground to be in desaturation state for a long time.
As preferred version of the present invention, the method that the air content of described water body air content checkout gear to the underground water extracted is analyzed is: bulk modulus method, I calculates according to the following formula:
In formula, C is the underground water air content extracted, and is also underground water air content in liquefied foundation; B
ffor recording the bulk modulus of the underground water of extraction; B
wfor the bulk modulus of pure water, get 2.2GPa, B
afor the bulk modulus of air, be taken as 0.142MPa.
Due to the bulk modulus B of formula air
amuch smaller than the bulk modulus B of pure water
w, therefore formula I can be approximately formula II:
When the bulk modulus of the underground water in liquefied foundation is 2.84MPa, in liquefied foundation, the air content of underground water reaches 5%, and the desaturation of liquefied foundation is 95%.
Advantage of the present invention and effect are:
1, the present invention is adopted and drinking-water pipe, water body air content checkout gear, external application suction pump, gas generating unit is connected successively by flexible pipe with water inlet pipe, closed flow promoter system is formed with liquefied foundation, recharge after groundwater abstraction being injected bubble in liquefied foundation, and carry out the method that circulates, saturated liquefied foundation is become the ground of desaturation state, the pressure-air splitting foundation soil body avoiding ground aeration produces the shortcoming of foundation structure damage.
2, the present invention utilizes the underground water in ground to circulate, and neither needs to reduce water level to change the stress state of ground in construction, can not produce infringement to foundation structure; Do not need additionally to add a large amount of water source and cause the wasting of resources yet.
3, the external application that the present invention the adopts pump lift that draws water is greater than the length of drinking-water pipe, can ensure that the underground water in drinking-water pipe deep can be extracted out.
4, the present invention adopt water body air content checkout gear to detect the method for underground water air content can the saturation ratio of Measurement accuracy ground, construction quality is controlled.
5, the present invention is with low cost, and equipment is simple, and drinking-water pipe and water inlet pipe are distributed in diverse location in different environments, are applicable to the process of large area liquefied foundation.
6, drinking-water pipe, water body air content checkout gear, external application suction pump, gas generating unit and water inlet pipe is connected by flexible pipe, the operation that also can continue to carry out drawing water and pouring water after the construction of Liquefaction Foundation top structure can be realized, ground is reached and is in desaturation state for a long time, reach the anti-liquefaction object of ground.
Accompanying drawing illustrates:
Fig. 1 a kind of construction schematic diagram of liquefaction foundation treatment device for the liquefied foundation on new building ground increasing underground water air content of the present invention;
Fig. 2 a kind of liquefaction foundation treatment device increasing underground water air content of the present invention is for the construction schematic diagram after the construction of liquefied foundation top structure.
In figure, 1 is liquefied foundation, and 2 is ground mulching layer, and 3 is drinking-water pipe, and 4 is geotextiles, and 5 is aperture, and 6 is water inlet pipe, and 7 is flexible pipe, and 8 is external application suction pump, and 9 is gas generating unit, and 10 is water body air content checkout gear, and 11 is water (flow) direction, and 12 is top structure.
Detailed description of the invention
Increase a liquefaction foundation treatment device for underground water air content, comprise water pipe, geotextiles 4, external application suction pump 8, gas generating unit 9, described water pipe is the water pipe with holes of outer layer covers geotextiles 4, has two, is respectively drinking-water pipe 3 and water inlet pipe 6; Described, the holed part of drinking-water pipe 3 and water inlet pipe 6 is all placed in liquefied foundation 1, and drinking-water pipe 3 and external application suction pump 8, gas generating unit 9, water inlet pipe 6, successively after flexible pipe 7 is connected, form with liquefied foundation 1 flow promoter system closed; Described external application suction pump 8, its lift is greater than the length of drinking-water pipe 3.
Described water pipe with holes is PVC plastic material, and diameter is 10 ~ 20cm, and thickness is 5 ~ 10mm, and the aperture 5 diameter 3 ~ 8mm on water pipe with holes, aperture 5 spacing is 5 ~ 10cm.
The bubble diameter that described gas generating unit 9 produces is less than or equal to 100um.
Water body air content checkout gear 10 is also provided with between drinking-water pipe 3 and external application suction pump 8.
Embodiment 1
Increase a construction method for liquefied foundation 1 treating apparatus of underground water air content, as shown in Figure 1, for the construction method on new building ground, comprise following technical step:
1) according to position and the degree of depth of liquefied foundation 1, part drinking-water pipe 3 and water inlet pipe 6 being positioned at liquefied foundation 1 lays aperture 5;
2) liquefied foundation 1 diverse location is driven into respectively after drinking-water pipe 3 and water inlet pipe 6 being wrapped up by geotextiles 4, and ensureing that the holed part of drinking-water pipe 3 and water inlet pipe 6 is all arranged in liquefied foundation 1, drinking-water pipe 3 is connected with flexible pipe 7 respectively with water inlet pipe 6 above ground mulching layer 2;
3) drinking-water pipe 3, water body air content checkout gear 10, external application suction pump 8, gas generating unit 9 are connected by flexible pipe 7 successively with water inlet pipe 6, form with liquefied foundation 1 flow promoter system closed, wherein water body air content checkout gear 10, external application suction pump 8 and gas generating unit 9 are positioned at above liquefied foundation 1;
4) open external application suction pump 8, gas generating unit 9, water body air content checkout gear 10 simultaneously, underground water in the liquefied foundation 1 that external application suction pump 8 extracts, bubble is injected the underground water extracted by gas generating unit 9, underground water with bubble recharges liquefied foundation 1 by water inlet pipe 6, and the underground water in liquefied foundation 1 is circulated by water (flow) direction 11 between drinking-water pipe 3 and water inlet pipe 6;
5) analyzed by the air content of water body air content checkout gear 10 to the underground water extracted, when underground water air content is more than 5%, stops pumping and intake;
6) regularly repeat step 1 ~ 5, keep liquefied foundation 1 to be in desaturation state for a long time.
Described water body air content checkout gear 10 to the method that the underground water air content extracted is analyzed is: bulk modulus method, I calculates according to the following formula:
In formula, C is the underground water air content extracted, and is also underground water air content in liquefied foundation 1; B
ffor recording the bulk modulus of the underground water of extraction; B
wfor the bulk modulus of pure water, get 2.2GPa, B
afor the bulk modulus of air, be taken as 0.142MPa.
Due to the bulk modulus B of formula air
amuch smaller than the bulk modulus B of pure water
w, therefore formula I can be approximately formula II:
When in liquefied foundation 1, the air content of underground water reaches 5%, when namely the desaturation of liquefied foundation 1 is 95%, the bulk modulus of underground water is 2.84MPa.
Embodiment 2
Increase a construction method for the liquefaction foundation treatment device of underground water air content, as shown in Figure 2, for the construction method after the construction of liquefied foundation 1 top structure 12.
Be with the difference of embodiment 1, step 2) in drinking-water pipe 3 and water inlet pipe 6 are wrapped up by geotextiles 4 after be driven into liquefied foundation 1 diverse location respectively, and ensureing that the holed part of drinking-water pipe 3 and water inlet pipe 6 is all arranged in liquefied foundation 1, drinking-water pipe 3 is connected with flexible pipe 7 respectively with water inlet pipe 6 in ground mulching layer 2; Step 3) in drinking-water pipe 3, water body air content checkout gear 10, external application suction pump 8, gas generating unit 9 are connected by flexible pipe 7 successively with water inlet pipe 6, when forming with liquefied foundation 1 flow promoter system closed, water body air content checkout gear 10, external application suction pump 8, gas generating unit 9 are positioned at top structure 12 side of liquefied foundation 1.
The above; be only and invent preferably detailed description of the invention; but protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; replace on an equal basis according to the technical scheme of inventing and design thereof or change, all should be encompassed within protection scope of the present invention.
Claims (6)
1. one kind increases the liquefaction foundation treatment device of underground water air content, comprise water pipe, geotextiles, external application suction pump, gas generating unit, it is characterized in that: described water pipe is the water pipe with holes of outer layer covers geotextiles, has two, is respectively drinking-water pipe and water inlet pipe; The holed part of described drinking-water pipe and water inlet pipe is all placed in liquefied foundation, and drinking-water pipe and external application suction pump, gas generating unit, water inlet pipe, successively after flexible pipe is connected, form closed flow promoter system with liquefied foundation; Described external application suction pump, its lift is greater than the length of drinking-water pipe.
2. a kind of liquefaction foundation treatment device increasing underground water air content according to claim 1, it is characterized in that: described water pipe with holes is PVC plastic material, diameter is 10 ~ 20cm, and thickness is 5 ~ 10mm, hole diameter 3 ~ 8mm on water pipe with holes, aperture pitch is 5 ~ 10cm.
3. a kind of liquefaction foundation treatment device increasing underground water air content according to claim 1, is characterized in that: the bubble diameter that described gas generating unit produces is less than or equal to 100um.
4. a kind of liquefaction foundation treatment device increasing underground water air content according to claim 1, is characterized in that: between drinking-water pipe and external application suction pump, be also provided with water body air content checkout gear.
5. the construction method increasing the liquefaction foundation treatment device of underground water air content as claimed in claim 4, comprises following technical step:
1) according to position and the degree of depth of liquefied foundation, part drinking-water pipe and water inlet pipe being positioned at liquefied foundation lays aperture;
2) be driven into liquefied foundation diverse location respectively by after drinking-water pipe and water inlet pipe geotextiles parcel, and ensure that the holed part of drinking-water pipe and water inlet pipe is all arranged in liquefied foundation;
3) drinking-water pipe, water body air content checkout gear, external application suction pump, gas generating unit are connected by flexible pipe successively with water inlet pipe, form closed flow promoter system with liquefied foundation;
4) open water body air content checkout gear, external application suction pump and gas generating unit simultaneously, external application suction pump extracts the underground water in liquefied foundation, bubble is injected the underground water extracted by gas generating unit, underground water with bubble recharges liquefied foundation by water inlet pipe, makes the underground water in liquefied foundation at drinking-water pipe, circulates between gas generating unit and water inlet pipe;
5) by water body air content checkout gear, the underground water air content extracted is analyzed, when air content in underground water is more than 5%, stops pumping and intake;
6) regularly repeat step 1 ~ 5, keep liquefied foundation to be in desaturation state for a long time.
6. a kind of construction method increasing the liquefaction foundation treatment device of underground water air content as claimed in claim 5, it is characterized in that water body air content checkout gear to the method that the underground water air content extracted is analyzed is: bulk modulus method, account form is, detect the bulk modulus of the underground water of extraction, undertaken calculating Ground water gas body burden by formula II
In formula II, C is the underground water air content extracted, and is also the air content of underground water in liquefied foundation; B
ffor recording the bulk modulus of the underground water of extraction; B
afor the bulk modulus of air, be taken as 0.142MPa, when the bulk modulus of underground water in liquefied foundation is 2.84MPa, in liquefied foundation, the air content of underground water reaches 5%, and the desaturation of liquefied foundation is 95%.
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| CN201510162750.3A CN104895044A (en) | 2015-04-08 | 2015-04-08 | A liquefied foundation treatment device increasing the gas content of underground water and a construction method |
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| CN201510162750.3A CN104895044A (en) | 2015-04-08 | 2015-04-08 | A liquefied foundation treatment device increasing the gas content of underground water and a construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109131754A (en) * | 2018-07-24 | 2019-01-04 | 浙江海洋大学 | Desaturation device and method is inflated in the anti-fluidization of the easy fluidised form cargo of shipping |
| CN113006039A (en) * | 2021-03-05 | 2021-06-22 | 中电建路桥集团有限公司 | Dynamic compaction reinforcing construction method for collapsible loess foundation |
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|---|---|---|---|---|
| JP2008002170A (en) * | 2006-06-22 | 2008-01-10 | Sato Kogyo Co Ltd | Soil improving method |
| JP2010209633A (en) * | 2009-03-12 | 2010-09-24 | Sato Kogyo Co Ltd | Method of improving ground |
| CN103104219A (en) * | 2011-11-14 | 2013-05-15 | 国惠环保新能源有限公司 | Method using same-layer equivalent in-site extraction well group to extract underground heat energy |
| CN103993594A (en) * | 2014-05-26 | 2014-08-20 | 东南大学 | Liquefiable foundation device for micro-nano bubble processing and operation method |
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2015
- 2015-04-08 CN CN201510162750.3A patent/CN104895044A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008002170A (en) * | 2006-06-22 | 2008-01-10 | Sato Kogyo Co Ltd | Soil improving method |
| JP2010209633A (en) * | 2009-03-12 | 2010-09-24 | Sato Kogyo Co Ltd | Method of improving ground |
| CN103104219A (en) * | 2011-11-14 | 2013-05-15 | 国惠环保新能源有限公司 | Method using same-layer equivalent in-site extraction well group to extract underground heat energy |
| CN103993594A (en) * | 2014-05-26 | 2014-08-20 | 东南大学 | Liquefiable foundation device for micro-nano bubble processing and operation method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109131754A (en) * | 2018-07-24 | 2019-01-04 | 浙江海洋大学 | Desaturation device and method is inflated in the anti-fluidization of the easy fluidised form cargo of shipping |
| CN113006039A (en) * | 2021-03-05 | 2021-06-22 | 中电建路桥集团有限公司 | Dynamic compaction reinforcing construction method for collapsible loess foundation |
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Application publication date: 20150909 |