CN209429108U - Ultrasonic activation drain bar for vacuum pre-press reinforcing super soft ground - Google Patents
Ultrasonic activation drain bar for vacuum pre-press reinforcing super soft ground Download PDFInfo
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- CN209429108U CN209429108U CN201820629024.7U CN201820629024U CN209429108U CN 209429108 U CN209429108 U CN 209429108U CN 201820629024 U CN201820629024 U CN 201820629024U CN 209429108 U CN209429108 U CN 209429108U
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- drain bar
- vacuum
- ultrasonic activation
- soft ground
- super soft
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The utility model relates to a kind of ultrasonic activation drain bars for vacuum pre-press reinforcing super soft ground, for having the vacuum preloading pilot system of drain bar, which is characterized in that the drain bar includes the ultrasonic transducer being fixed thereon.The utility model can effectively prevent drain bar silting, improve vacuum preloading discharging consolidation rate, accelerate pore water pressure dissipation, improve soil stabilization.
Description
Technical field
The utility model relates to a kind of drain bars for vacuum preloading test.
Background technique
With the large-scale development & construction of public transport infrastructure, need of the densely populated coastal area to land resource
It asks and increasingly increases, the land resource development in short supply seriously affected and hinder urbanization process, while being also that restriction is coastal
One critical issue of resource development.Many countries and regions solve the problems, such as this by reclaiming land around sea, and vacuum method is
One of weak soil or super soft ground processing major way.Conventional vacuum method is that plastic draining board is set in soft soil foundation
As vertical drainage channel, then in the certain thickness sand bedding course of foundation surface place mat, and drainage pipe is laid in sand bedding course,
Sealing film is laid on sand bedding course again, film surrounding pile things on, by the drainage pipe being embedded in sand bedding course, makes in burying
Be evacuated with vacuum pump, under the action of negative pressure of vacuum, gradually form negative pressure in sand bedding course and drain bar, at the same drain bar and
Pressure difference is formed between surrounding soil, seepage flow under the action of pressure difference of the pore water in the soil body passes through draining into drain bar
Chimney filter discharge, so that soil body Pore Pressure dissipates, effective stress increases, to achieve the purpose that soil mass consolidation.
When conventional vacuum precompressed handles soft base, often consolidation effect is limited, and it is big to show as early period consolidation draining amount, draining effect
Fruit is obvious, is remarkably decreased to later period drainage effect, and the agglomerated body of the soil body nearby occurs in plastic draining board, and far from draining
Soil body character has no significant changes at plate, this has seriously affected Foundation Treatment Effect.To find out its cause, being because in drain bar filter membrane
The outside of structure, since the aggregation of soil particle forms relatively compact silting layer, negative pressure of vacuum load is difficult to through silting layer
It is transmitted among the soil body other than silting layer, and original water and gas are difficult to enter artificial drainage across silting layer in the soil body
System discharge.
In recent years, domestic and foreign scholars and Engineering Task person have developed many different types of change in continuous practical experience
Into vacuum preloading method, including the strong tamping combined method for strengthening of vacuum-heaped united pre-compressed method, vacuum drainage-, High vacuum compacting method,
Underwater vacuum precompression method, low position vacuum preloading method, stereo preloading method, electric osmose-vacuum-dewatering joint reinforcement method, electric osmose-are true
Airborne water-low-energy strong-ramming joint reinforcement method, vacuum-gas injection method for strengthening, splitting vacuum method, vacuum-dewatering joint punching press
Method, vacuum preloading-lime stabilization joint reinforcement method etc..
Although miscellaneous improvement vacuum preloading method can improve soil stabilization to a certain extent, vacuum is pre-
Defect existing for pressure method itself still cannot avoid completely, especially drain bar silting problem, it would be highly desirable to continue research and development.
Utility model content
In view of the above problems, the object of the present invention is to provide a kind of drain bars for vacuum preloading test, use
The vacuum preloading pilot system of the drain bar of the utility model can effectively prevent drain bar silting, improve vacuum preloading draining
Rate of consolidation accelerates pore water pressure dissipation, improves soil stabilization.The technical solution of the utility model is as follows:
A kind of ultrasonic activation drain bar for vacuum pre-press reinforcing super soft ground, for having the vacuum of drain bar
Pre-compression test system, which is characterized in that the drain bar includes the ultrasonic transducer being fixed thereon.
The utility model has several advantages that
(1) the utility model is for that after being driven by supersonic generator, can generate ultrasound in vacuum preloading pilot system
The features such as wave, small using ultrasonic activation construction noise, small to soil disturbance and power output stable and uniform, studies ultrasonic wave
Vacuum preloading construction technique is vibrated, the requirement of green construction is met；
(2) ultrasonic activation vibrates the small soil particle around drain bar from microcosmic (molecular level) angle, and
Ultrasonic energy is highly uniform to be distributed in around drain bar；
(drain bar of 3 the utility model is significantly improved effect to silting after being driven by supersonic generator, can
To accelerate draining, promote pore pressure dissipation, accelerate the consolidation rate of super soft ground, improves soil stabilization.
Detailed description of the invention
Fig. 1 is the vacuum preloading pilot system layout drawing using the drain bar of the utility model.
Fig. 2 is the ultrasonic activation drain bar schematic diagram of ultrasonic vibration apparatus and the utility model.
Figure label explanation: 1 drain bar；2 ultrasonic transducers；3 drain bars-wired hose crossover sub；4 nonwovens geotechnique
Woven fabric；5 sealing films；6 organic glass model casees；7 data signal lines；8 wired hoses；9 supersonic generators；10 ultrasonic waves occur
Device switch；11 aqueous vapor knockout drums；12 pressure vacuum gauges；13 vacuum pumps；14 vacuum pressure control valves；15 electronic scales；16 test soil
Sample.
Specific embodiment
The utility model is illustrated with reference to the accompanying drawings and examples.
Referring to Fig. 1 and Fig. 2, include using the vacuum preloading pilot system of the drain bar of the utility model, in organic glass
Test soil sample 16 is added in glass model casing 6, ultrasonic activation drain bar (drain bar 1 and ultrasonic transducer 2 are inserted into soil sample
It is composed), ultrasonic activation drain bar one end is connect by data signal line 7 with the supersonic generator 9 with switch 10,
The other end is connected with the drain bar-wired hose crossover sub 3 for being connected with wired hose 8；One is first laid in the upper surface of test soil sample
Layer non-woven geotextile 4, is laid with one layer of sealing film 5 on non-woven geotextile 4；Wired hose 8 and pressure vacuum gauge 12 is installed
Aqueous vapor knockout drum 11 be connected, aqueous vapor knockout drum is placed in the top of electronic scale 15, and with 13 phase of vacuum pump that has control valve 14
Even.
Experimental procedure are as follows:
(1) certain thickness barged-in fill test soil sample 16 is put into organic glass model case 6；
(2) it is laid with nonwoven geotechnique woven fabric 4, and is inserted into ultrasonic activation drain bar 1,2；
(3) drain bar 1 and wired hose 8 are connected, and is connect with drain bar-wired hose crossover sub 3；
(4) aqueous vapor knockout drum 11 is placed in 15 top of electronic scale；
(5) wired hose 8 and vacuum pump 13 are connected on the aqueous vapor knockout drum 11 for being equipped with vacuum meter 12, are laid with later
Film 5, and the air-tightness of check device are sealed, the reading of the vacuum pressure of aqueous vapor knockout drum is made to reach setting value；
(6) vacuum pump 13 is opened, load is vacuumized, carries out vacuum preloading test；
(7) data such as pore pressure, settling amount are recorded by Acquisition Instrument, passes through 15 read-record displacement of electronic scale；
(8) when displacement is less, the switch 10 of supersonic generator 9 is opened, drain bar surrounding soil is vibrated
It is closed after a period of time, observes Acquisition Instrument and electronic scale reading variation；
(9) step (8) reciprocation cycle is multiple, until displacement is basically unchanged；
(10) it closes vacuum pump and unloads, off-test.
Working principle is: drain bar improved on the basis of conventional vacuum preloading method, it is longitudinally mounted in drain bar
Ultrasonic transmission device transform ultrasonic activation drain bar as, after taking out a period of time vacuum, opens ultrasonic activation transmitting dress
It sets, ultrasonic wave injects drain bar, vibrates hydrone and generates countless tiny bubbles.Bubble is along transonic direction in negative pressuren zone
It is formed, growth, and generates the instantaneous pressure of thousands of a atmospheric pressure and explosion in zone of positive pressure rapid closing, form countless microcosmic height
Press shock wave in draining plate surface.This i.e. ultrasonic wave and liquid " cavitation effect " that occurs.To which drain bar will be adsorbed on
The small soil particle on surface is vibrated away from drain bar, effectively prevent drain bar silting, improves vacuum preloading discharging consolidation rate, accelerates hole
Gap water pressure dissipates, and improves soil stabilization.
Claims (1)
1. a kind of ultrasonic activation drain bar for vacuum pre-press reinforcing super soft ground, pre- for the vacuum with drain bar
Press pilot system, which is characterized in that the drain bar includes the ultrasonic transducer being fixed thereon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820629024.7U CN209429108U (en) | 2018-04-28 | 2018-04-28 | Ultrasonic activation drain bar for vacuum pre-press reinforcing super soft ground |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820629024.7U CN209429108U (en) | 2018-04-28 | 2018-04-28 | Ultrasonic activation drain bar for vacuum pre-press reinforcing super soft ground |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209429108U true CN209429108U (en) | 2019-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820629024.7U Active CN209429108U (en) | 2018-04-28 | 2018-04-28 | Ultrasonic activation drain bar for vacuum pre-press reinforcing super soft ground |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108468324A (en) * | 2018-04-28 | 2018-08-31 | 天津大学 | Ultrasonic activation drain bar for vacuum pre-press reinforcing super soft ground |
-
2018
- 2018-04-28 CN CN201820629024.7U patent/CN209429108U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108468324A (en) * | 2018-04-28 | 2018-08-31 | 天津大学 | Ultrasonic activation drain bar for vacuum pre-press reinforcing super soft ground |
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