CN110926040B - Solar panel self-cleaning support - Google Patents
Solar panel self-cleaning support Download PDFInfo
- Publication number
- CN110926040B CN110926040B CN201911234331.0A CN201911234331A CN110926040B CN 110926040 B CN110926040 B CN 110926040B CN 201911234331 A CN201911234331 A CN 201911234331A CN 110926040 B CN110926040 B CN 110926040B
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- solar panel
- support
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- snow
- cleaning
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- 238000004140 cleaning Methods 0.000 title claims abstract description 27
- 230000005484 gravity Effects 0.000 claims abstract description 11
- 238000005452 bending Methods 0.000 claims abstract description 6
- 239000000428 dust Substances 0.000 abstract description 21
- 230000000694 effects Effects 0.000 abstract description 9
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 239000011435 rock Substances 0.000 abstract description 2
- 239000007921 spray Substances 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 241000533950 Leucojum Species 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007907 direct compression Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S25/00—Arrangement of stationary mountings or supports for solar heat collector modules
- F24S25/50—Arrangement of stationary mountings or supports for solar heat collector modules comprising elongate non-rigid elements, e.g. straps, wires or ropes
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S20/00—Supporting structures for PV modules
- H02S20/30—Supporting structures being movable or adjustable, e.g. for angle adjustment
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/10—Cleaning arrangements
- H02S40/12—Means for removing snow
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/47—Mountings or tracking
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention discloses a solar panel self-cleaning support, which is characterized in that a support rod of a fixed support and a base support are connected by a spring to create an unsteady structure of a solar panel. In a normal state, the gravity center of the solar panel is adjusted to be on the upper end and lower end connecting lines of the support rods of the fixed support through the support rod connector of the fixed support moving up and down, and a balance state is maintained through a spring structure; after the solar panel is accumulated with snow, the accumulated snow is close to the lower part of the solar panel, the center of the solar panel support moves downwards, the spring is bent, the angle of the solar panel is increased, and the accumulated snow falls; then the spring resets, causes to rock, further shakes off the snow on the board to reach the effect of snow removing. Because of the lever force generated by the bending of the spring, the sensitivity is improved, and the snow removing effect is enhanced. In addition, under windy weather conditions, due to the influence of wind force, the unsteady-state solar panel self-cleaning support based on the spring support can shake and vibrate to different degrees, so that the falling of dust and attachments is promoted, and the self-cleaning function is realized.
Description
Technical Field
The invention belongs to the technical field of solar modules, and particularly relates to a self-cleaning support for a solar panel.
Background
The solar panel is placed in the field for a long time, dust, fallen leaves and even sundries such as plastic bags and the like are inevitably accumulated, and the northern area is easy to cover the accumulated snow. The dust or the deposit can cause the light transmittance to be reduced or the light transmittance to be partially shielded, the power generation efficiency is seriously reduced if the dust or the deposit is light, and the solar panel component is locally overheated or even burnt out if the dust or the deposit is heavy.
The commonly used automatic cleaning device for the solar panel is mostly based on an electric cleaning device, adopts the electric device to sweep snow and blow dust for the solar panel, and is a utility model with the bulletin number of CN207612239U and the name of 'a dust-removing and snow-preventing tracking type solar photovoltaic bracket', which is issued by the authorization of 13.07.2018, and comprises a base, wherein a pillar is arranged in the middle of the top of the base, brackets are arranged on the left and right sides of the pillar, the bottom of the bracket is arranged on the base, a rotating device is arranged at the top of the pillar, a supporting plate is arranged at the top of the rotating device, slideways are arranged on the front and back sides of the top of the supporting plate, the solar panel is arranged in the middle of the top of the supporting plate, a snow scraping device is arranged on the left side of the top of the supporting plate, snow is removed through scraping the snow device for solar photovoltaic support keeps clean and tidy, can not covered by snow, and the hair-dryer can be blown the dust of attaching to on solar photovoltaic support, thereby reaches the effect of removing dust and preventing snow.
The snow removal device is also heated by using a control system, snow is removed by increasing the inclination angle of the solar panel, and the snow removal device is authorized to announce on 26.08.2018, has the announcement number of CN 207543057U and is named as a light energy collecting structure suitable for heavy snowy days, and comprises a supporting underframe, a solar panel supporting frame, a load beam, a lifting support rod, a lifting motor, an ice and snow sensing controller, a thin-shell type heating plate and a microprocessor, wherein the lifting motor is arranged on the opposite side edges of the supporting underframe respectively, the lifting motor is connected with the microprocessor, the lifting motor is connected with one end of the lifting support rod, the other end of the lifting support rod is connected with the load beam, the load beam is welded with one end of the solar panel supporting frame, the other end of the solar panel supporting frame is connected with; the thin-shell type heating plate is arranged above the solar panel supporting frame and is connected with a working power supply arranged on the supporting underframe, and the working power supply is connected with the microprocessor; the utility model has the advantages of simple structure, low in production cost, and it is convenient to install, has the function of automatic snow removing deicing simultaneously, has improved illumination efficiency.
The solar rack with the snow removing function comprises a hollow rack, wherein a snow melting agent for removing snow is filled in a cavity of the rack, the lower end of the rack is sealed, the upper end of the rack is provided with an opening, a spray pipe for conveying the snow melting agent is arranged at the opening in a penetrating manner, one end of the spray pipe is inserted into the snow melting agent, the other end of the spray pipe penetrates through the opening and is connected with a spray head for spraying the snow melting agent, the spray head is arranged right above the solar panel, and the spray pipe is provided with a powder spraying pump for pumping the snow melting agent into the spray pipe; the support is equipped with the drive assembly that supplementary snow removing's scraper blade and drive scraper blade removed along solar panel, and the scraper blade is made by thermal-insulated material, and the inside first cavity that is equipped with of scraper blade is equipped with the zone of heating in the first cavity, is equipped with the heating wire in the zone of heating, and the scraper blade both sides are equipped with the first cavity of switch-on and are used for the gas pocket of exhaust hot-air, and the gas pocket sets up towards solar panel slope. The solar panel has the advantages that accumulated snow is removed, and the service life of the solar panel is prolonged.
These devices are complicated, require additional energy and are costly to maintain.
Fig. 1 is a schematic structural diagram of a photovoltaic solar panel with snow accumulation prevention function in the prior art.
As shown in fig. 1, in the photovoltaic solar panel with snow accumulation prevention function entitled authorized announcement on 15.02/15.2019 with an authorized announcement number CN208508877U, a solar panel self-cleaning support is disclosed, which comprises a base 1, a distribution box 2, a clamping plate 3, a supporting seat 4, a spring 5, a first support 6, a dust removing brush 7, a solar panel 8, a shell 9, a second support 10, a rotating shaft 11, a driving gear 12, a motor 13, an air velocity sensor 14, a vertical rod 15 and a driven gear 16, wherein the distribution box 2 is arranged at the top end of the base 1, the vertical rod 15 is arranged at one side of the top end of the base 1 close to the distribution box 2, the motor 13 is arranged at one side of the top end of the base 1 close to the vertical rod 15, the rotating shaft 11 is arranged at the top end of the rotating shaft 11, the supporting seat 4 is arranged at the top end of the rotating shaft 11, the driven gear 16 is, driven gear 16's one end is provided with driving gear 12, the top of supporting seat 4 is provided with first support 6, one side that the top of supporting seat 4 is close to first support 6 is provided with second support 10, the inside of first support 6 is provided with spring 5, the top of first support 6 is provided with shell 9, the inside of shell 9 is provided with solar panel 8, the both ends of shell 9 all are provided with cardboard 3, solar panel 8's top is provided with dust removal brush 7, block terminal 2, dust removal brush 7, motor 13 and air velocity transducer 14 all with external power source electric connection.
Principle and using process: one side that the 1 top of base is close to montant 15 is provided with motor 13, detects wind speed and wind direction through air velocity transducer 14, and when the wind speed reached the setting value, STC89C51 singlechip sent the instruction, and motor 14 rotates, makes solar panel 8's side keep unanimous with the wind direction, has avoided the wind speed too big, causes solar panel 8's damage. The spring 5 is arranged in the first support 6, the angle of the solar panel 8 is automatically adjusted after the spring 5 is pressed, when snow is accumulated on the solar panel 8, the spring 5 is compressed and contracted, when the snow reaches a certain thickness, the angle of the solar panel 8 is correspondingly enlarged, the friction force between the snow and the solar panel 8 is reduced, the snow falls off the solar panel 8, the situation that the solar panel 8 is collapsed due to excessive snow is avoided, the clamping plates 3 are arranged at two ends of the shell 9, the solar panel 8 is inserted into the shell 9 and then is fixed by the clamping plates 3, when the solar panel 8 breaks down, when maintenance is needed, the solar panel 8 can be pulled out only by pulling out the clamping plates 3 to two sides, the solar panel 8 can be pulled out, convenience is provided for maintenance personnel, the top end of the solar panel 8 is provided with the dust removing brush 7, dust on the solar panel 8 is removed, excessive dust is prevented from being accumulated on the solar panel 8, and the light utilization rate of the solar panel 8 is prevented from being influenced.
In the above-mentioned photovoltaic solar panel with prevent snow function, to the getting rid of snow, although need not consume extra energy, also need not maintain, but the spring setting is in the inside of first support, and the spring receives pressure downstream for the corresponding grow of solar panel's angle, frictional force between snowflake and the solar panel diminishes, and snow follows the solar panel landing. This kind of mode relies on the direct compression of spring to realize solar panel's angle owing to there are two supports, and its sensitivity is not high: the spring needs to support the solar panel to have certain supporting force, has certain compression, and further compression is more difficult, and two supports share a part of gravity, so the sensitivity is lower, and the snow removing effect is not good. In addition, dust is removed by a dust removing brush, and the dust removing brush does not have a self-cleaning function.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a solar panel self-cleaning support so as to improve the angle change sensitivity of a solar panel and enhance the snow removing effect. Meanwhile, the dust collector also has a self-cleaning function for dust.
In order to achieve the above object, the present invention provides a solar panel self-cleaning support, comprising:
the solar panel fixing support is provided with a solar panel above, and the left middle part and the right middle part are provided with fixing support supporting rod connectors capable of moving up and down;
the fixed support supporting rod is a vertical mounting rod, and the upper end of the fixed support supporting rod is fixedly connected with the solar panel fixed support through a fixed support supporting rod connector;
the upper end of the spring is fixedly connected with the lower end of the support rod of the fixed bracket;
the base bracket is a vertical mounting rod, the upper end of the base bracket is fixedly connected with the lower end of the spring, and the lower end (of the base bracket) is fixed on the ground (or fixed on a building);
the support rod connector of the fixing support moves up and down to enable the gravity center of the solar panel fixing support to be located on the connecting line of the upper end and the lower end of the support rod of the fixing support.
The purpose of the invention is realized as follows:
the invention relates to a solar panel self-cleaning support which comprises a solar panel fixing support, a fixing support supporting rod, a spring and a base support, wherein the spring is used for connecting the fixing support supporting rod and the base support to create a solar panel unstable structure; after the solar panel is accumulated with snow, the accumulated snow is accumulated on the solar panel and is unevenly distributed, and the accumulated snow is usually close to the lower part of the solar panel, so that the gravity center of the solar panel support moves downwards, the spring is bent, the angle of the solar panel is increased, and the accumulated snow falls; then the spring resets, causes to rock, further shakes off the snow on the board to reach the effect of snow removing. Because the lever strength that the spring bending produced makes solar panel take place the angle change more easily, consequently sensitivity improves, has strengthened snow removing effect. In addition, under windy weather conditions, due to the influence of wind force, the unsteady-state solar panel self-cleaning support based on the spring support can shake and vibrate to different degrees, so that the falling of dust and attachments is promoted, and the self-cleaning function is realized.
Drawings
FIG. 1 is a schematic view of a photovoltaic solar panel with snow accumulation prevention function in the prior art;
FIG. 2 is a schematic structural view of an embodiment of a self-cleaning support for a solar panel according to the present invention;
FIG. 3 is a schematic diagram of a comparison between snow on a conventional single-pole-supported solar panel and snow on a solar panel self-cleaning support of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided in order to better understand the present invention for those skilled in the art with reference to the accompanying drawings. It is to be expressly noted that in the following description, a detailed description of known functions and designs will be omitted when it may obscure the subject matter of the present invention.
Fig. 2 is a schematic structural view of a solar panel self-cleaning bracket according to an embodiment of the present invention.
In this embodiment, as shown in fig. 2, the solar panel self-cleaning support of the present invention comprises a solar panel fixing support 1, a fixing support rod 3, a spring 4, and a base support 5.
In this embodiment, as shown in the left drawing of fig. 2, the solar panel fixing support 1 is an i-shaped structure, the left and right sides of the two upper and lower cross rods are respectively provided with a solar panel fixing screw hole 102, and the solar panel 2 is installed above the solar panel fixing support 1 through the solar panel fixing screw holes 102, as shown in the right drawing of fig. 2. The fixed support supporting rod connector 101 is installed on a vertical rod of the solar panel fixed support 1 and can move up and down.
The fixed support supporting rod 3 is a vertical mounting rod, and the upper end of the fixed support supporting rod is fixedly connected with the solar panel fixed support 1 through a fixed support supporting rod connector 101.
The upper end of the spring 4 is fixedly connected with the lower end 3 of the support rod of the fixed support.
The base support 5 is a vertical mounting rod, the upper end of which is fixedly connected with the lower end of the spring, and the lower end of the base support is fixed on the ground 6 or a building.
Moving the fixing-frame support-bar connector 101 up and down makes the center of gravity of the solar panel fixing frame 1 on the upper and lower end connecting lines of the fixing-frame support bar 3, thus maintaining a balanced state by a spring structure.
The solar panel self-cleaning support disclosed by the invention is connected with a fixed support supporting rod 3 and a base support 5 by utilizing a spring 4, so that an unstable structure of the solar panel is created. In a normal state, the solar panel 2 works at a design angle, and the center of gravity of the solar panel 2 is adjusted to the upper and lower end connection lines of the fixed frame support rods 3 through the fixed frame support rod connector 101 moving up and down, so that a balanced state is maintained through a spring structure. After the solar panel 2 is accumulated with snow, the accumulated snow is accumulated on the solar panel 2 and is unevenly distributed, and the accumulated snow is usually close to the lower part of the solar panel 2, so that the gravity center of the solar panel fixing support 1 moves downwards, the spring 4 is bent, the angle of the solar panel 2 is increased, and the accumulated snow falls; then the spring 4 resets to cause shaking, further shaking off the accumulated snow on the plate, thereby achieving the snow removing effect. Because the lever strength that the spring bending produced makes solar panel take place the angle change more easily, consequently sensitivity improves, has strengthened snow removing effect. In addition, under windy weather conditions, due to the influence of wind force, the unsteady-state solar panel self-cleaning bracket supported by the spring 4 can shake and vibrate to different degrees, so that the falling of dust and attachments is promoted.
FIG. 3 is a schematic diagram of a comparison between snow on a conventional single-pole-supported solar panel and snow on a solar panel self-cleaning support of the present invention.
In this embodiment, as shown in the left side of fig. 3, when the single-rod-supported solar panel is used for accumulating accumulated snow, the accumulated snow can slide down only by the gravity of the accumulated snow, and the accumulated snow is not easy to be removed. As shown in the right drawing of FIG. 3, accumulated objects such as snow are accumulated on the solar panel and close to the lower part of the solar panel, the gravity center of the solar panel fixing support moves downwards, so that the spring is bent, the angle of the solar panel is increased, and the accumulated objects such as snow fall off, thereby having a self-cleaning function.
In the specific implementation process, in order to avoid the situation that the spring cannot reset due to the fact that the spring is bent by the aid of a solar panel fixing support (comprising a solar panel arranged above the spring) supported at the upper end of the spring and gravity of a supporting rod of the fixing support, the length of the spring and the length of the supporting rod of the fixing support are smaller than that of the base support.
In a specific implementation, in a steady state, the spring is in an upright or slightly bent state (the degree of bending is less than 5%); in the unstable state, the spring bends or increases the bending amplitude.
Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, and various changes may be made apparent to those skilled in the art as long as they are within the spirit and scope of the present invention as defined and defined by the appended claims, and all matters of the invention which utilize the inventive concepts are protected.
Claims (3)
1. A solar panel self-cleaning support, comprising:
the base bracket is a vertical mounting rod, and the lower end of the base bracket is fixed on the ground or a building;
it is characterized by also comprising:
the solar panel fixing support is provided with a solar panel above, and the left middle part and the right middle part are provided with fixing support supporting rod connectors capable of moving up and down;
the fixed support supporting rod is a vertical mounting rod, and the upper end of the fixed support supporting rod is fixedly connected with the solar panel fixed support through a fixed support supporting rod connector;
the upper end of the spring is fixedly connected with the lower end of the support rod of the fixed support, and the upper end of the base support is fixedly connected with the lower end of the spring;
the support rod connector of the fixing support moves up and down to enable the gravity center of the solar panel fixing support to be located on the connecting line of the upper end and the lower end of the support rod of the fixing support.
2. Solar panel self-cleaning support according to claim 1, wherein the length of the spring + the length of the fixed support rod is smaller than the length of the base support.
3. Solar panel self-cleaning support according to claim 1, wherein in a steady state the spring is in an upright or slightly bent state; in the unstable state, the spring bends or increases the bending amplitude.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911234331.0A CN110926040B (en) | 2019-12-05 | 2019-12-05 | Solar panel self-cleaning support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911234331.0A CN110926040B (en) | 2019-12-05 | 2019-12-05 | Solar panel self-cleaning support |
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| Publication Number | Publication Date |
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| CN110926040A CN110926040A (en) | 2020-03-27 |
| CN110926040B true CN110926040B (en) | 2021-06-04 |
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| CN201911234331.0A Active CN110926040B (en) | 2019-12-05 | 2019-12-05 | Solar panel self-cleaning support |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111940345B (en) * | 2020-07-29 | 2022-06-14 | 成都恒云高科科技有限公司 | Solar panel cleaning device based on self-rotation |
| CN112202397B (en) * | 2020-10-19 | 2021-07-09 | 绍兴市秀臻新能源科技有限公司 | Solar photovoltaic panel with snow removing function |
| CN113386606B (en) * | 2021-07-28 | 2023-03-21 | 杭州思拓瑞吉科技有限公司 | Wind-solar-storage integrated charging pile for electric automobile |
| CN114632732B (en) * | 2022-03-10 | 2022-12-27 | 安庆师范大学 | Dry type cleaning device for surface of solar cell panel |
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| CN205694621U (en) * | 2016-03-07 | 2016-11-23 | 江苏飞扬农业科技有限公司 | A kind of pressure resistant type planting greenhouse |
| CN207762792U (en) * | 2018-01-19 | 2018-08-24 | 江苏华夏灯业制造有限公司 | A kind of new type solar energy LED street lamp |
| CN109756178A (en) * | 2019-02-15 | 2019-05-14 | 王树刚 | A kind of new-type multifunctional solar panel support frame |
| CN110258978B (en) * | 2019-07-03 | 2020-12-11 | 宜春市富锐气体有限责任公司 | Roof snow collecting and melting device capable of preventing snow from collapsing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN206774898U (en) * | 2017-06-06 | 2017-12-19 | 浙江麦格电气有限公司 | A kind of outdoor ring main unit |
| CN207909469U (en) * | 2018-01-08 | 2018-09-25 | 南安市鑫灿品牌运营有限公司 | A kind of solar energy path construction warning signs |
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