CN111535589A - Device and method for conveying concrete downwards - Google Patents
Device and method for conveying concrete downwards Download PDFInfo
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- CN111535589A CN111535589A CN202010642980.0A CN202010642980A CN111535589A CN 111535589 A CN111535589 A CN 111535589A CN 202010642980 A CN202010642980 A CN 202010642980A CN 111535589 A CN111535589 A CN 111535589A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
- E04G21/04—Devices for both conveying and distributing
- E04G21/0418—Devices for both conveying and distributing with distribution hose
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- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention provides a device and a conveying method for downward conveying of concrete, belongs to the technical field of concrete conveying control, and aims to realize real-time flow regulation according to the flow velocity of the concrete in a pipeline and guarantee continuous conveying of the concrete in the pipeline. The device comprises a hopper and a pipeline arranged below the hopper, wherein a velocimeter is respectively arranged at an inlet and an outlet of the pipeline, and a cut-off device is also arranged at the outlet of the pipeline and used for controlling the flow of the outlet. By the device, the outlet flow is adjusted and controlled in real time according to the actual flow of the concrete entering the pipeline on site, so that the continuity and uniformity of the concrete flowing in the pipeline are ensured; on the other hand, the dynamic control logic can eliminate the adverse factor of over-limitation, thereby ensuring the conveying efficiency.
Description
Technical Field
The invention relates to the technical field of concrete conveying control, in particular to a device and a method for conveying concrete downwards.
Background
In the field of building engineering, the overground part of a large building or structure is supported by the corresponding underground part, for example, a super high-rise building main body structure is usually designed on a large-volume concrete foundation bottom plate. In the pouring construction of such large underground concrete structures, concrete mixtures transported to the site by concrete production units need to be transported from the surface to the ground. According to different construction processes, the conveying modes comprise pump truck conveying, sliding pipe conveying and the like. Because the fresh concrete is a fluid substance, in the downward conveying process, if the fall is large, the gravity action can cause the sliding speed of the concrete in the pipeline to be inconsistent, so that separation is generated, and the uniformity of the concrete material is seriously influenced. The better the concrete flow, the more difficult it is to control the downward delivery. Currently, countermeasures taken by people include increasing the gliding resistance of concrete by adding a section of spiral pipe in the descending pipeline. Because the buffering effect that can provide after this type of pipeline that installs additional is fixed, can not adjust according to the mobility of different concretes and the actual flow condition in scene.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information is prior art that is known to a person skilled in the art.
Disclosure of Invention
The invention mainly aims to provide a device and a method for adjusting flow in real time according to the concrete flow velocity in a pipeline and ensuring continuous delivery of concrete in the pipeline.
In order to achieve the purpose, the technical scheme of the invention is as follows:
an apparatus for downward delivery of concrete comprising:
the hopper is used for containing the concrete to be conveyed unloaded by the mixer truck;
the section of the pipeline is circular, and the pipeline is used for conveying concrete downwards;
two tachymeters are provided, one tachymeter is arranged at the inlet of the pipeline and is positioned below the hopper, and the other tachymeter is arranged at the outlet of the pipeline and is positioned above the outlet; and
the cut-off device is fixed at the outlet of the pipeline and comprises a shell, a control chip, a gear and a cut-off plate, the shell is rigidly connected with the pipeline, the gear moves the cut-off plate according to the instruction of the control chip, and the cut-off plate extends out of or retracts into the shell in the horizontal plane under the driving of the gear.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention provides a device for conveying concrete downwards, which comprises a hopper and a pipeline arranged below the hopper, wherein a velocimeter is respectively arranged at an inlet and an outlet of the pipeline, and a cut-off device is also arranged at the outlet of the pipeline and used for controlling the flow of the outlet. By the device, the outlet flow is adjusted and controlled in real time according to the actual flow of the concrete entering the pipeline on site, so that the continuity and uniformity of the concrete flowing in the pipeline are ensured; on the other hand, the dynamic control logic can eliminate the adverse factor of over-limitation, thereby ensuring the conveying efficiency.
Furthermore, in order to obtain materials conveniently, the velocimeter is an ultrasonic tester.
The invention also provides a method for conveying a device for conveying concrete downwards, which comprises the following steps:
step S1, when the pouring is started on site, the mixer truck starts to put concrete into the hopper, the initial position of the stop plate is inside the stop, and the outlet of the pipeline is not blocked; starting two velocimeters to synchronously measure the concrete flow velocity v at the upper end of the pipeline1And the concrete flow velocity v at the lower end of the pipe2The measured speed data is sent to the control chip of the cut-off device through the narrow-band wireless network;
step S2, the concrete flowing into the pipeline is just filled in the cross section of the pipeline because the upper end of the pipeline is close to the hopper, and the concrete flow rate is q = A ∙ v1(ii) a Where A = π ∙ R2Is the cross-sectional area of the pipeline, and R is the radius of the pipeline; flow velocity v measured at the lower end of the pipe2If equal to v1If the concrete in the pipeline flows continuously from the inlet to the outlet, the concrete in the pipeline flows continuously; on the contrary, if v2Greater than v1If the concrete flows out of the pipeline, the concrete in the pipeline is separated;
and step S3, the control chip in the cut-off device sends instructions to the gear at intervals to adjust the outflow of concrete at the lower end of the pipeline, so that the continuity and the efficiency of concrete conveying are guaranteed.
Further, the step S3 includes:
step S31 if v is equal to a =0 cutoff displacement1=v2This means that the outlet is not closed and the delivery continuity is good, which is an ideal condition for delivering concrete downwards, and therefore does not perform any operation;
step S32 if v is equal to a =0 cutoff displacement1<v2This means that the outlet is not blocked but the delivery continuity is poor, the outlet flow needs to be limited, and according to the principle of the balance of the inflow and outflow, the control gear extends the stop plate to a new displacement a', the value of which satisfies A ∙ v1=A1∙v2， A1=(1−θ/π)∙πR2+ (R-a ') ∙ R ∙ sin θ is the partial cross-sectional area not blocked by the cutoff plate, where θ = arccos (1-a'/R);
step S33 stopping the displacement a>At 0, if v1=v2This means that although the delivery continuity is good, the outlet flow is limited by the cut-off, at this time the control gear retracts the cut-off plate by a displacement, thereby increasing the flow;
step S34 stopping the displacement a>At 0, if v1<v2This represents poor delivery continuity and insufficient outlet flow restriction, at which time the control gear extends the shut-off plate a displacement to further reduce the outlet flow.
Further, the period of time in the step S3 is 0.1 second.
Further, the displacement is 0.1R.
Drawings
FIG. 1 is a schematic view showing the construction of an apparatus for downward delivery of concrete according to an embodiment of the present invention;
FIG. 2 is a schematic view showing the construction of a stopper in the apparatus for downward delivery of concrete according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating the step S31 in the method for conveying the apparatus for conveying concrete downward according to the embodiment of the present invention.
In the figure:
1-a hopper; 2-a pipeline; 3-a velocimeter; 4-cut-off device, 41-shell, 42-control chip, 43-gear and 44-cut-off plate.
Detailed Description
The apparatus and method for downward concrete feeding according to the present invention will be described in further detail with reference to the accompanying drawings and specific examples. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. For convenience of description, the directions of "up" and "down" described below are the same as the directions of "up" and "down" in the drawings, but this is not a limitation of the technical solution of the present invention.
Example one
The structural composition of the apparatus for downward delivery of concrete according to the present invention will be described in detail with reference to fig. 1 to 3.
Referring to fig. 1 to 3, a device for downward conveying concrete includes a hopper 1, a pipe 2, a velocimeter 3 and a stopper 4, wherein the hopper 1 is used for containing a mixer truck to discharge concrete to be conveyed; the section of the pipeline 2 is circular, and the pipeline 2 is used for conveying concrete downwards; two tachymeters 3 are provided, one tachymeter 3 is arranged at the inlet of the pipeline 2 and is positioned below the hopper 1, and the other tachymeter 3 is arranged at the outlet of the pipeline and is positioned above the outlet; and the cut-off device 4, the cut-off device 4 is fixed at the outlet of the pipeline 2, the cut-off device 4 comprises a shell 41, a control chip 42, a gear 43 and a cut-off plate 44, the shell 41 is rigidly connected with the pipeline 2, the gear 43 moves the cut-off plate 44 according to the instruction of the control chip 42, and the cut-off plate 44 extends or retracts in the horizontal plane under the driving of the gear 43.
Specifically, the device for conveying concrete downwards of this embodiment includes hopper 1 and pipeline 2 that sets up in its below, and pipeline 2's entry and exit have respectively set up a tachymeter 3, and pipeline 2 exit still is equipped with cut-off device 4 for control outlet flow. By the device, the outlet flow is adjusted and controlled in real time according to the actual flow of the concrete entering the pipeline on site, so that the continuity and uniformity of the concrete flowing in the pipeline are ensured; on the other hand, the dynamic control logic can eliminate the adverse factor of over-limitation, thereby ensuring the conveying efficiency.
In this embodiment, it is more preferable that the velocimeter 3 is an ultrasonic tester for obtaining materials conveniently.
With continued reference to fig. 1-3, the present invention also provides a method of transporting a device for downward delivery of concrete, the method comprising:
step S1, when the pouring is started on site, the mixer truck starts to put concrete into the hopper, the initial position of the stop plate 44 is inside the stop 4, and the outlet of the pipeline 2 is not blocked; starting two speed measuring instruments 3 and synchronously measuring the concrete flow velocity v at the upper end of the pipeline1And the concrete flow velocity v at the lower end of the pipe2The measured speed data is sent to the control chip 42 of the cut-off 4 through the narrow-band wireless network;
step S2, since the upper end of the pipe 2 is next to the hopper 1, the concrete just flowed into the pipe 2 is in a state of filling the cross section of the pipe, where the concrete flow rate is q = a ∙ v 1; where A = π ∙ R2Is the cross-sectional area of the pipeline, and R is the radius of the pipeline; flow velocity v measured at the lower end of the pipe 22If equal to v1If the concrete in the pipeline flows continuously from the inlet to the outlet, the concrete in the pipeline flows continuously; on the contrary, if v2Greater than v1If the concrete flows out of the pipeline 2, the concrete in the pipeline is separated from the concrete;
step S3, the control chip 42 in the cut-off 4 sends an instruction to the gear 43 at intervals to adjust the outflow of the concrete at the lower end of the pipeline 2, thereby ensuring the continuity and efficiency of concrete delivery.
In the present embodiment, more preferably, step S3 includes:
step S31 if v is equal to a =0 cutoff displacement1=v2This means that the outlet is not closed and the delivery continuity is good, which is an ideal condition for delivering concrete downwards, and therefore does not perform any operation;
step S32 when cutoff displacement a =0If v is1<v2This means that the outlet is not blocked but the delivery continuity is poor, the outlet flow needs to be limited, and according to the principle of the balance of the inflow and outflow, the control gear extends the stop plate to a new displacement a', the value of which satisfies A ∙ v1=A1∙v2， A1=(1−θ/π)∙πR2+ (R-a ') ∙ R ∙ sin θ is the partial cross-sectional area not blocked by the cutoff plate, where θ = arccos (1-a'/R);
step S33 stopping the displacement a>At 0, if v1=v2This means that although the delivery continuity is good, the outlet flow is limited by the cut-off, at this time the control gear retracts the cut-off plate by a displacement, thereby increasing the flow;
step S34 stopping the displacement a>At 0, if v1<v2This represents poor delivery continuity and insufficient outlet flow restriction, at which time the control gear extends the shut-off plate a displacement to further reduce the outlet flow.
Specifically, the period of time in step S3 is 0.1 seconds. In step S34, the displacement is 0.1R. The time and displacement are selected empirically, which ensures flexible regulation of the outlet flow without causing excessive energy burden to the device. And are not limited herein.
The above description is only illustrative of the preferred embodiments of the present invention and does not limit the scope of the present invention in any way. Any changes and modifications of the above disclosure by those skilled in the art are within the scope of the appended claims.
Claims (6)
1. An apparatus for downward delivery of concrete, comprising:
the hopper is used for containing the concrete to be conveyed unloaded by the mixer truck;
the section of the pipeline is circular, and the pipeline is used for conveying concrete downwards;
two tachymeters are provided, one tachymeter is arranged at the inlet of the pipeline and is positioned below the hopper, and the other tachymeter is arranged at the outlet of the pipeline and is positioned above the outlet; and
the cut-off device is fixed at the outlet of the pipeline and comprises a shell, a control chip, a gear and a cut-off plate, the shell is rigidly connected with the pipeline, the gear moves the cut-off plate according to the instruction of the control chip, and the cut-off plate extends out of or retracts into the shell in the horizontal plane under the driving of the gear.
2. The apparatus for concrete feeding down of claim 1, wherein the speed tester is an ultrasonic tester.
3. A method of conveying a device for downward concrete delivery, comprising:
step S1, when the pouring is started on site, the mixer truck starts to put concrete into the hopper, the initial position of the stop plate is inside the stop, and the outlet of the pipeline is not blocked; starting two velocimeters to synchronously measure the concrete flow velocity v at the upper end of the pipeline1And the concrete flow velocity v at the lower end of the pipe2The measured speed data is sent to the control chip of the cut-off device through the narrow-band wireless network;
step S2, the concrete flowing into the pipeline is just filled in the cross section of the pipeline because the upper end of the pipeline is close to the hopper, and the concrete flow rate is q = A ∙ v1(ii) a Where A = π ∙ R2Is the cross-sectional area of the pipeline, and R is the radius of the pipeline; flow velocity v measured at the lower end of the pipe2If equal to v1If the concrete in the pipeline flows continuously from the inlet to the outlet, the concrete in the pipeline flows continuously; on the contrary, if v2Greater than v1If the concrete flows out of the pipeline, the concrete in the pipeline is separated;
and step S3, the control chip in the cut-off device sends instructions to the gear at intervals to adjust the outflow of concrete at the lower end of the pipeline, so that the continuity and the efficiency of concrete conveying are guaranteed.
4. The conveying method according to claim 3, characterized in that said step S3 comprises:
step S31 if v is equal to a =0 cutoff displacement1=v2This means that the outlet is not closed and the delivery continuity is good, which is an ideal condition for delivering concrete downwards, and therefore does not perform any operation;
step S32 if v is equal to a =0 cutoff displacement1<v2This means that the outlet is not blocked but the delivery continuity is poor, the outlet flow needs to be limited, and according to the principle of the balance of the inflow and outflow, the control gear extends the stop plate to a new displacement a', the value of which satisfies A ∙ v1=A1∙v2， A1=(1−θ/π)∙πR2+ (R-a ') ∙ R ∙ sin θ is the partial cross-sectional area not blocked by the cutoff plate, where θ = arccos (1-a'/R);
step S33 stopping the displacement a>At 0, if v1=v2This means that although the delivery continuity is good, the outlet flow is limited by the cut-off, at this time the control gear retracts the cut-off plate by a displacement, thereby increasing the flow;
step S34 stopping the displacement a>At 0, if v1<v2This represents poor delivery continuity and insufficient outlet flow restriction, at which time the control gear extends the shut-off plate a displacement to further reduce the outlet flow.
5. The conveying method according to claim 3, wherein the period of time in step S3 is 0.1 seconds.
6. The method of claim 4, wherein the length of displacement is 0.1R.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010642980.0A CN111535589B (en) | 2020-07-07 | 2020-07-07 | Device and method for conveying concrete downwards |
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| CN202010642980.0A CN111535589B (en) | 2020-07-07 | 2020-07-07 | Device and method for conveying concrete downwards |
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| CN202884289U (en) * | 2012-10-12 | 2013-04-17 | 三一重工股份有限公司 | Concrete conveying pipe and concrete pumping device |
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| JP2017009510A (en) * | 2015-06-25 | 2017-01-12 | 前田建設工業株式会社 | Pressure delivery performance evaluation system of fresh concrete |
| CN206681380U (en) * | 2017-03-22 | 2017-11-28 | 中铁四局集团路桥工程有限公司 | A kind of windlass type concrete hopper |
| CN108896745A (en) * | 2018-06-14 | 2018-11-27 | 上海建工集团股份有限公司 | A kind of concrete pumping supersonic guide-wave monitoring device and monitoring method |
| CN209874495U (en) * | 2019-03-04 | 2019-12-31 | 中建二局第二建筑工程有限公司 | Full concrete outer wall is pour and is used portable magazine attachment |
-
2020
- 2020-07-07 CN CN202010642980.0A patent/CN111535589B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61290121A (en) * | 1985-06-18 | 1986-12-20 | Kumagai Gumi Ltd | Method and apparatus for placement of slurry |
| CN101178323A (en) * | 2007-11-29 | 2008-05-14 | 浙江大学 | Concrete pump real time flow measurement method and apparatus |
| CN202884289U (en) * | 2012-10-12 | 2013-04-17 | 三一重工股份有限公司 | Concrete conveying pipe and concrete pumping device |
| CN104153581A (en) * | 2014-07-28 | 2014-11-19 | 中建一局集团建设发展有限公司 | Device and method for water-air combined washing of ultrahigh-pressure concrete conveying pump pipe |
| CN204728710U (en) * | 2015-05-22 | 2015-10-28 | 中建三局第一建设工程有限责任公司 | A kind of mortar vertical transferring apparatus for multistory building |
| JP2017009510A (en) * | 2015-06-25 | 2017-01-12 | 前田建設工業株式会社 | Pressure delivery performance evaluation system of fresh concrete |
| CN206681380U (en) * | 2017-03-22 | 2017-11-28 | 中铁四局集团路桥工程有限公司 | A kind of windlass type concrete hopper |
| CN108896745A (en) * | 2018-06-14 | 2018-11-27 | 上海建工集团股份有限公司 | A kind of concrete pumping supersonic guide-wave monitoring device and monitoring method |
| CN209874495U (en) * | 2019-03-04 | 2019-12-31 | 中建二局第二建筑工程有限公司 | Full concrete outer wall is pour and is used portable magazine attachment |
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| CN111535589B (en) | 2020-09-25 |
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