CN108627427A - A method of measuring dredge pipes of cutter suction dredger line slurry resistance coefficient - Google Patents
A method of measuring dredge pipes of cutter suction dredger line slurry resistance coefficient Download PDFInfo
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- CN108627427A CN108627427A CN201710177848.5A CN201710177848A CN108627427A CN 108627427 A CN108627427 A CN 108627427A CN 201710177848 A CN201710177848 A CN 201710177848A CN 108627427 A CN108627427 A CN 108627427A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/02—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material
- G01N11/04—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture
- G01N11/08—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture by measuring pressure required to produce a known flow
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Abstract
A method of measuring dredge pipes of cutter suction dredger line slurry resistance coefficient, by adjusting the dredge pump rotating speed under each concentration of hydraulic mixture, record the row pressure of afterbody dredge pump and mud speed rate, and combine sludge discharge pipeline head and the tail height difference and construction area natural earth density, calculate slurry resistance coefficient of whole pipeline under each concentration of hydraulic mixture corresponding to different mud speed rates, it is fitted the functional relation under each concentration of hydraulic mixture between whole sludge discharge pipeline slurry resistance coefficient and mud speed rate further according to slurry resistance coefficient calculated value, and instant mud concentration and flow velocity are substituted into based on the functional relation, it calculates and determines the whole sludge discharge pipeline instant mud resistance coefficient of cutter suction dredger.The shortcomings that unlike material pipeline friction loss and pipeline fittings local resistance loss need to being measured respectively the present invention overcomes conventional method, have the characteristics that quick, efficient and reliable, slurry transportation construction parameter, which has positive meaning, quickly, rationally to be determined to large-scale cutter suction dredger.
Description
Technical field
The present invention relates to phase flow pipeline hydraulic transportation technical field, especially a kind of measurement dredge pipes of cutter suction dredger line mud resistance
The method of force coefficient.
Background technology
In the prior art, the calculating of dredge pipes of cutter suction dredger line slurry resistance coefficient need to be according to soil property and live pipeline
Laying condition, in construction, the friction loss of on-site measurement unlike material pipeline and the local resistance loss of attachment, determine
The resistance coefficient of unlike material pipeline and the local resistance loss coefficient of pipeline fittings.This determining method efficiency is low, and time-consuming,
It is of high cost, and be difficult to determine whole sludge discharge pipeline drag losses rapidly when construct soil property, pipeline operating mode change, it influences
Ship working security and production efficiency.To improve current Dredging and filling engineering construction technology level and production efficiency, improve each
Coordination mechanism between main body of constructing, achievees the purpose that high efficiency, low energy consumption and environmental protection construction on the whole, needs one kind faster
Speed more accurately twists the assay method for inhaling sludge pipe slurry resistance coefficient formula.
Invention content
The technical problem to be solved by the present invention is to overcome the defect in the presence of the above-mentioned prior art, one kind is provided and is based on
The rapid assay methods of whole sludge discharge pipeline slurry resistance coefficient.
To achieve the above object of the invention, use following technical proposal of the invention, a kind of measurement dredge pipes of cutter suction dredger
The method of line slurry resistance coefficient, includes the following steps：
Step 1：Measure the height difference between sludge discharge pipeline head and the tail, and twist and inhale ship construction area natural earth density。
Step 2：It is 0 that sludge discharge pipeline, which exports mud pressure, and afterbody dredge pump row pressure is between sludge discharge pipeline head and the tail
Pressure difference is。
Step 3：Cutter suction dredger control concentration of hydraulic mixture in construction is 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%,
Control dredge pump rotating speed is stepped up by 80% rated speed to 100% rated speed at various concentrations, and every 5 minutes dredge pump rotating speeds improve
1%, the corresponding mud speed rate of each concentration of hydraulic mixture, afterbody dredge pump row pressure are acquired respectively, and gathered data time interval 10 seconds is divided
The average mud speed rate corresponding to each concentration of hydraulic mixture and dredge pump rotating speed is not calculatedWith average dredge pump row pressure, whereinFor mud
Concentration is starched,For dredge pump rotating speed.
Step 4：Whole sludge discharge pipeline slurry resistance coefficient is calculated using following formula,
In formula,For density of sea water,For acceleration of gravity.
Step 5：Using least square fitting concentration of hydraulic mixtureRespectively 5%, 10%40% when whole sludge discharge pipeline
Slurry resistance coefficientWith mud speed rateBetween functional relation。
Step 6：The mud speed rate of the real time measure and concentration are substituted into function, calculate and determine whole sludge pipe
Line instant mud resistance coefficient.
The outstanding advantages of the present invention are using whole sludge discharge pipeline as calculation and object slurry resistance coefficient, by being pressed in the short time
It constructs according to set concentration of hydraulic mixture and dredge pump rotating speed, acquires mud speed rate and afterbody dredge pump row pressure, you can using most
Small square law Computing Principle fits the function between whole pipeline slurry resistance coefficient and mud speed rate under different concentration of hydraulic mixture
Relationship.The present invention overcomes conventional methods need to be to unlike material pipeline friction loss and pipeline fittings local resistance loss point
The shortcomings that not measuring, have the characteristics that it is quick, efficient and reliable, to large-scale cutter suction dredger quickly, rationally determine mud
Conveying construction parameter has positive meaning.
Description of the drawings
Fig. 1 is the flow diagram of the method for the invention.
Specific implementation mode
With reference to embodiments and attached drawing the invention will be further described.
Referring to Fig.1, the present invention exports the pressure difference between sludge discharge pipeline outlet according to afterbody dredge pump, in conjunction with construction
Height difference in area's natural earth density, pipeline between mud speed rate, concentration and sludge pipe head and the tail calculates and determines whole sludge discharge pipeline
Slurry resistance coefficient, and according to the calculated value of whole sludge discharge pipeline slurry resistance coefficient in a period of time, using least square method
It is fitted the functional relation between sludge discharge pipeline slurry resistance coefficient and mud speed rate under different concentration of hydraulic mixture.Pass through the real time measure
Mud speed rate and concentration can be calculated according to the functional relation between the sludge discharge pipeline slurry resistance coefficient and mud speed rate of fitting
Determine whole sludge discharge pipeline instant mud resistance coefficient.
The present invention is as follows：
Step 1：Measure the height difference between sludge discharge pipeline head and the tail, and twist and inhale ship construction area natural earth density。
Step 2：It is 0 that sludge discharge pipeline, which exports mud pressure, and afterbody dredge pump row pressure is whole sludge discharge pipeline head and the tail
Between pressure difference, be。
Step 3：Cutter suction dredger controls concentration of hydraulic mixture in constructionFor 5%, 10%, 15%, 20%, 25%, 30%, 35%,
40%, dredge pump rotating speed is controlled at various concentrationsIt is stepped up to 100% rated speed by 80% rated speed, every 5 minutes dredge pumps turn
Speed improves 1%, acquires the corresponding mud speed rate of each concentration of hydraulic mixture, afterbody dredge pump row pressure respectively.The time interval of gathered data
It is 10 seconds, calculates the average mud speed rate corresponding to each concentration of hydraulic mixture and dredge pump rotating speedWith average dredge pump row pressure。
Step 4：Whole sludge discharge pipeline slurry resistance coefficient is calculated using following formula,
In formula,For density of sea water, 1.025t/m is taken3, For acceleration of gravity, 9.81m/s is taken2。
Step 5：Using least square fitting mud densityRespectively 5%, 10%40% when whole sludge discharge pipeline
Slurry resistance coefficientWith mud speed rateBetween functional relation, see below formula,
Wherein：
。
Step 6：The mud speed rate of the real time measure and concentration are substituted into function, calculate
Determine whole sludge discharge pipeline instant mud resistance coefficient.
Below by way of one embodiment, the specific steps of the present invention are described in detail.
Step 1：Measure the height difference between the new dolphin wheel sludge pipe head and the tail of large-scale cutter suction dredger, construction area
Soil property is medium coarse sand, natural earth density。
Step 2：New dolphin wheel spoil disposal pipeline outlet mud pressure is 0, and pump row pressure is whole sludge discharge pipeline head and the tail in cabin
Between pressure difference, be。
Step 3：In work progress, control concentration of hydraulic mixture is 5%, and controls mud revolution speedIt is opened by 80% rated speed
Begin, acquires the corresponding mud speed rate of each concentration of hydraulic mixture, afterbody dredge pump row pressure respectively, the time interval of gathered data is 10
Second, every 5 minutes dredge pump rotating speeds improve 1% up to reaching 100% rated speed, calculate the corresponding average mud speed rate of each dredge pump rotating speedWith average dredge pump row pressure；Concentration of hydraulic mixture is controlled againWhen respectively 10%, 15%, 20%, 25%, 30%, 35%, 40%, weight
Multiple above-mentioned steps, respectively obtain the average mud speed rate corresponding to each concentration of hydraulic mixture and dredge pump rotating speed
。
Average dredge pump row pressure：
Step 4：By what is calculated in step 3WithBring formula into
In formula,For density of sea water, take, For acceleration of gravity, take
, calculate whole sludge discharge pipeline slurry resistance coefficient。
Step 5：Using least square fitting mud densityRespectively 5%, 10%40% when whole sludge discharge pipeline mud
Starch resistance coefficientWith mud speed rateBetween functional relation, obtain：
。
Step 6：It brings the concentration of the real time measure, flow velocity into respective formula and can determine whole sludge discharge pipeline instant mud resistance
Force coefficient, such as real-time a concentration of 25%, flow velocity 5.20m/s is brought intoIt calculates
Whole sludge discharge pipeline instant mud resistance coefficient。
Claims (3)
1. a kind of method measuring dredge pipes of cutter suction dredger line slurry resistance coefficient, includes the following steps：
Step 1：Measure the height difference between sludge discharge pipeline head and the tail, and twist and inhale ship construction area natural earth density；
Step 2：It is 0 that sludge discharge pipeline, which exports mud pressure, and afterbody dredge pump row pressure is the pressure between sludge discharge pipeline head and the tail
Difference is；
Step 3：Cutter suction dredger control concentration of hydraulic mixture in construction is 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, each
Dredge pump rotating speed is controlled under concentration to be stepped up to 100% rated speed by 80% rated speed, every 5 minutes dredge pump rotating speeds improve 1%,
The corresponding mud speed rate of each concentration of hydraulic mixture, afterbody dredge pump row pressure are acquired respectively, and gathered data time interval 10 seconds is counted respectively
Calculate the average mud speed rate corresponding to each concentration of hydraulic mixture and dredge pump rotating speedWith average dredge pump row pressure, whereinIt is dense for mud
Degree,For dredge pump rotating speed；
Step 4：Whole sludge discharge pipeline slurry resistance coefficient is calculated using following formula,
In formula,For density of sea water,For acceleration of gravity；
Step 5：Using least square fitting concentration of hydraulic mixtureRespectively 5%, 10%40% when whole sludge discharge pipeline mud
Resistance coefficientWith mud speed rateBetween functional relation；
Step 6：The mud speed rate of the real time measure and concentration are substituted into function, calculate and determine that whole sludge discharge pipeline is real
When slurry resistance coefficient.
2. a kind of method measuring dredge pipes of cutter suction dredger line slurry resistance coefficient according to claim 1, feature
It is：Height difference is the height that afterbody dredge pump is exported between sludge discharge pipeline outlet between sludge discharge pipeline head and the tail described in step 1
Difference.
3. a kind of method measuring dredge pipes of cutter suction dredger line slurry resistance coefficient according to claim 1, feature
It is：The afterbody dredge pump row pressure is pressure difference between whole sludge discharge pipeline head and the tail.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710177848.5A CN108627427A (en) | 2017-03-23 | 2017-03-23 | A method of measuring dredge pipes of cutter suction dredger line slurry resistance coefficient |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109933861A (en) * | 2019-02-25 | 2019-06-25 | 中交上海航道局有限公司 | A method of fitting dredger sludge discharge pipeline slurry resistance characteristic formula |
| CN112730150A (en) * | 2020-12-21 | 2021-04-30 | 中交疏浚技术装备国家工程研究中心有限公司 | Pipeline slurry density measurement model and measurement application method |
-
2017
- 2017-03-23 CN CN201710177848.5A patent/CN108627427A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109933861A (en) * | 2019-02-25 | 2019-06-25 | 中交上海航道局有限公司 | A method of fitting dredger sludge discharge pipeline slurry resistance characteristic formula |
| CN109933861B (en) * | 2019-02-25 | 2023-05-26 | 中交上海航道局有限公司 | Method for fitting mud resistance characteristic formula of dredger pipeline |
| CN112730150A (en) * | 2020-12-21 | 2021-04-30 | 中交疏浚技术装备国家工程研究中心有限公司 | Pipeline slurry density measurement model and measurement application method |
| CN112730150B (en) * | 2020-12-21 | 2022-07-15 | 中交疏浚技术装备国家工程研究中心有限公司 | Measuring model and measuring application method for pipeline slurry density |
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