WO2012144927A1 - Multi-pile tower support foundation - Google Patents
Multi-pile tower support foundation Download PDFInfo
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- WO2012144927A1 WO2012144927A1 PCT/RU2011/000641 RU2011000641W WO2012144927A1 WO 2012144927 A1 WO2012144927 A1 WO 2012144927A1 RU 2011000641 W RU2011000641 W RU 2011000641W WO 2012144927 A1 WO2012144927 A1 WO 2012144927A1
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- WIPO (PCT)
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- pile
- welded
- foundation
- sleeve
- holes
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/56—Screw piles
Definitions
- the utility model relates to the field of electric power construction and, in particular, to the foundations for tower supports used, for example, in the construction of power lines.
- the prototype contains piles and a metal grillage mounted on them with the help of docking units.
- Docking nodes are support tables, welded to piles and grillage.
- the prototype grillage is made in the form of two parallel plates fastened with stiffeners. In the central part of the grillage in the plates there are holes for a flange connection with the base of the tower support. On the periphery of the grillage in parallel plates, holes for piles are made.
- a disadvantage of the known device is low manufacturability due to the large volume of welding work at the construction site of the multi-pile foundation.
- the technical result of the utility model is to increase the manufacturability of a multi-pile foundation by eliminating welding.
- the subject of the utility model is a multi-pile foundation containing at least two piles and a metal grillage installed on them with the help of docking units, each of which made in the form of a glass, mounted upside down on the pile with at least one pin inserted into coaxial holes made in the walls of the glass and the head of the pile, and equipped with a pin welded from the outside of the glass to its bottom and fixed in a vertical hole of a metal grillage .
- the utility model has been developed according to which the metal grillage contains a central element and two peripheral elements, while the central element is made of two parallel beams welded to which a plate with holes for a flange connection to the base of the tower support is fixed, and two cross-members welded to the beams that fasten the ends of parallel beams, each peripheral element is made in the form of a beam with vertical holes for the pin of the docking unit, to which two consoles are welded, and the ends of the consoles are The peripheral element and the ends of the cross members of the central element are provided with flanges for bolting to each other.
- FIG. 1 shows a multi-pile foundation
- FIG. 2 docking unit
- FIG. 3 metal foundation grillage.
- the foundation contains piles 1, for example screw, and a metal grillage 2, mounted on them with the help of docking nodes 3.
- Each node 3 is made in the form of a cup 4, mounted upside down 5 on the pile 1 with the help of studs 6.
- Each stud 6 is inserted into the coaxial holes 7 in the walls of the glass 4 and the hole in the head of the pile 1 and is fixed on both sides with cotter pins.
- the glass 4 is equipped with a pin 8, welded on the outside of the glass 4 perpendicular to its bottom 5. A thread is applied to the pin 8, and it is fixed in the vertical hole 9 of the grill 2 with the help of a fixing nut 10.
- the grillage 2 includes a central element 11 and two peripheral elements 12.
- the central element 11 is made welded from two parallel beams 13, on which a plate 14 with holes 15 for flange connection with the base of the tower support is fixed, and two cross members welded to the beams 13.
- the cross members 16 fasten the ends of the parallel beams 13.
- Each peripheral element 12 is made in the form of a beam 17 with holes 9 under the pin 8 of the node 3 and two consoles welded to the beam 17.
- the ends of the consoles 18 and the ends of the cross members 16 are provided with flanges 19 with holes for bolting to each other.
- the welded joints of the beams 13 with the cross members 16, as well as the beams 17 with the consoles 18 are made using overhead metal sheets 20.
- the flanges 19 at the ends of the arms 18 and the cross members 16 are reinforced with stiffeners 21.
- the central element 11 and the peripheral elements 12 are manufactured in the factory.
- the Central element 11 is made as follows. A plate 14 with holes 15 is welded to the parallel beams 13. Flanges 19 are welded to the ends of the cross members 16 and perpendicular to their axes. The ends of the beams 13 are welded in pairs with the cross members 16 using patch sheets 20.
- the peripheral element 12 is made as follows. In the beams 17, holes 9 are drilled to fix the beams 17 and the grillage as a whole on piles 1. To the ends of the consoles 18 perpendicular to them the axes are welded and reinforced with ribs 21 of the flanges 19. Consoles 18 are welded to each beam 17 using patch sheets 20.
- Finished elements 11 and 12 grillage are delivered to the foundation construction site.
- Piles 1 are located at the construction site of the foundation according to the design layout and are alternately screwed into the ground, for example, using a capstan. This ensures the necessary degree of equality of the levels of their upper ends.
- the glasses 4 are put upside down on the head of the pile 1.
- the head of each pile 1 there are diametrically made holes (for example, two such holes).
- diametrically opposite places of the wall of the glass 4 there are mating holes 7, which when donning the glass 4 upside down 5 on the head of the pile 1, are installed coaxially with the diametrical holes made in the head of the pile 1.
- the pins 8 nodes 3 in this case occupy a vertical position.
- the beams 17 of the peripheral elements 12 are installed on the docking nodes 3 so that the pins 8 enter the vertical holes 9 and then are fixed in them with the help of fixing nuts 10 (in Fig. 3, the nuts 10 are conditionally shown screwed onto the rod 8). After that, the flanges 19 of the consoles 18 and the cross members 16 are connected by bolted connections. It is also possible to install on nodes 3 a fully assembled grill 2 from elements 11 and 12 with previously flanged flanges 19.
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to the field of power engineering and, in particular, to foundations under tower-type supports used, for example, in the construction of a power transmission line. The tower support foundation comprises piles (1) and a metal foundation frame (2) which is mounted on said piles with the aid of docking units (3). Each unit (3) is in the form of a sleeve (4) fastened upside down (5) on the pile (1) with the aid of bolts (6). Each bolt (6) is inserted into coaxial openings (7) in the walls of the sleeve (4) and into an opening in the head of the pile (1) and is fixed on two sides by split pins. The sleeve (4) is provided with a dowel (8) which is welded onto the outside of the sleeve (4) perpendicular to the base (5) thereof. The dowel (8) is provided with a thread, and said dowel is fixed in a vertical opening (9) in the metal foundation frame (2) with the aid of a fastening nut (10). The technical result consists in increasing the technological effectiveness of a multi-pile foundation by eliminating welding operations at the construction site of said foundation.
Description
Многосвайный фундамент башенной опоры Область техники Multi-pile foundation of a tower support
Полезная модель относится к области электроэнергетического строительства и, в частности, к фундаментам под опоры башенного типа, используемые, например, при сооружении линии электропередачи. The utility model relates to the field of electric power construction and, in particular, to the foundations for tower supports used, for example, in the construction of power lines.
Уровень техники State of the art
Известен, выбранный в качестве прототипа, многосвайный фундамент опоры линии электропередачи [RU86200U1 МГЖ E02D 27/14, 2009г.]. Known, selected as a prototype, multi-pile foundation of the transmission line support [RU86200U1 MGZH E02D 27/14, 2009.].
Прототип содержит сваи и установленный на них с помощью стыковочных узлов металлический ростверк. Стыковочные узлы представляют собой опорные столики, привариваемые к сваям и ростверку. Ростверк прототипа выполнен в виде двух параллельных пластин, скрепленных ребрами жесткости. В центральной части ростверка в пластинах имеются отверстия под фланцевое соединение с основанием башенной опоры. На периферии ростверка в параллельных пластинах выполнены отверстия под сваи. The prototype contains piles and a metal grillage mounted on them with the help of docking units. Docking nodes are support tables, welded to piles and grillage. The prototype grillage is made in the form of two parallel plates fastened with stiffeners. In the central part of the grillage in the plates there are holes for a flange connection with the base of the tower support. On the periphery of the grillage in parallel plates, holes for piles are made.
Недостаток известного устройства - низкая технологичность из-за большого объема сварочных работ на месте сооружения многосвайного фундамента. A disadvantage of the known device is low manufacturability due to the large volume of welding work at the construction site of the multi-pile foundation.
Раскрытие полезной модели Utility Model Disclosure
Технический результат полезной модели - повышение технологичности многосвайного фундамента за счет исключения сварочных работ. The technical result of the utility model is to increase the manufacturability of a multi-pile foundation by eliminating welding.
Предметом полезной модели является многосвайный фундамент, содержащий, по меньшей мере, две сваи и металлический ростверк, установленный на них с помощью стыковочных узлов, каждый из которых
выполнен в виде стакана, закрепленного вверх дном на свае с помощью, по меньшей мере, одной шпильки, вставленной в соосные отверстия, выполненные в стенках стакана и голове сваи, и снабжен штырем, приваренным снаружи стакана к его дну и зафиксированным в вертикальном отверстии металлического ростверка. Это позволяет получить указанный выше технический результат. The subject of the utility model is a multi-pile foundation containing at least two piles and a metal grillage installed on them with the help of docking units, each of which made in the form of a glass, mounted upside down on the pile with at least one pin inserted into coaxial holes made in the walls of the glass and the head of the pile, and equipped with a pin welded from the outside of the glass to its bottom and fixed in a vertical hole of a metal grillage . This allows you to get the above technical result.
Полезная модель имеет развитие, согласно которому металлический ростверк содержит центральный элемент и два периферийных элемента, при этом центральный элемент выполнен сварным из двух параллельных балок, на которых закреплена пластина с отверстиями под фланцевое соединение с основанием башенной опоры, и двух приваренных к балкам поперечин, скрепляющих концы параллельных балок, каждый периферийный элемент выполнен в виде балки с вертикальными отверстиями под штырь стыковочного узла, к которой приварены две консоли, а концы консолей периферийного элемента и концы поперечин центрального элемента снабжены фланцами для болтового соединения друг с другом. The utility model has been developed according to which the metal grillage contains a central element and two peripheral elements, while the central element is made of two parallel beams welded to which a plate with holes for a flange connection to the base of the tower support is fixed, and two cross-members welded to the beams that fasten the ends of parallel beams, each peripheral element is made in the form of a beam with vertical holes for the pin of the docking unit, to which two consoles are welded, and the ends of the consoles are The peripheral element and the ends of the cross members of the central element are provided with flanges for bolting to each other.
Развитие позволяет уменьшить габариты транспортируемых элементов многосвайного фундамента без использования сварочных работ на месте его сооружения. The development allows reducing the dimensions of the transported elements of the multi-pile foundation without the use of welding work at the site of its construction.
Краткое описание фигур Brief Description of the Figures
На фиг. 1 показан многосвайный фундамент, на фиг. 2 - стыковочный узел, на фиг. 3 - металлический ростверк фундамента. In FIG. 1 shows a multi-pile foundation; FIG. 2 - docking unit, in FIG. 3 - metal foundation grillage.
Осуществление полезной модели с учетом ее развития Implementation of a utility model, taking into account its development
Фундамент содержит сваи 1, например винтовые, и металлический ростверк 2, установленный на них с помощью стыковочных узлов 3. Каждый узел 3 выполнен в виде стакана 4, закрепленного вверх дном 5 на свае 1 с помощью шпилек 6. Каждая шпилька 6 вставлена в соосные отверстия 7 в стенках стакана 4 и отверстие в голове сваи 1 и зафиксирована
с двух сторон шплинтами. Стакан 4 снабжен штырем 8, приваренным снаружи стакана 4 перпендикулярно его дну 5. На штырь 8 нанесена резьба, и он зафиксирован в вертикальном отверстии 9 ростверка 2 с помощью крепежной гайки 10. The foundation contains piles 1, for example screw, and a metal grillage 2, mounted on them with the help of docking nodes 3. Each node 3 is made in the form of a cup 4, mounted upside down 5 on the pile 1 with the help of studs 6. Each stud 6 is inserted into the coaxial holes 7 in the walls of the glass 4 and the hole in the head of the pile 1 and is fixed on both sides with cotter pins. The glass 4 is equipped with a pin 8, welded on the outside of the glass 4 perpendicular to its bottom 5. A thread is applied to the pin 8, and it is fixed in the vertical hole 9 of the grill 2 with the help of a fixing nut 10.
Ростверк 2 включает центральный элемент 11 и два периферийных элемента 12. The grillage 2 includes a central element 11 and two peripheral elements 12.
Центральный элемент 11 выполнен сварным из двух параллельных балок 13, на которых закреплена пластина 14 с отверстиями 15 под фланцевое соединение с основанием башенной опоры, и двух приваренных к балкам 13 поперечин 16. Поперечины 16 скрепляют концы параллельных балок 13. The central element 11 is made welded from two parallel beams 13, on which a plate 14 with holes 15 for flange connection with the base of the tower support is fixed, and two cross members welded to the beams 13. The cross members 16 fasten the ends of the parallel beams 13.
Каждый периферийный элемент 12 выполнен в виде балки 17 с отверстиями 9 под штырь 8 узла 3 и приваренных к балке 17 двух консолей 18. Концы консолей 18 и концы поперечин 16 снабжены фланцами 19 с отверстиями для болтового соединения друг с другом. Each peripheral element 12 is made in the form of a beam 17 with holes 9 under the pin 8 of the node 3 and two consoles welded to the beam 17. The ends of the consoles 18 and the ends of the cross members 16 are provided with flanges 19 with holes for bolting to each other.
Сварные соединения балок 13 с поперечинами 16, а также балок 17 с консолями 18 выполнены с использованием накладных металлических листов 20. Фланцы 19 на концах консолей 18 и поперечин 16 укреплены ребрами 21 жесткости. The welded joints of the beams 13 with the cross members 16, as well as the beams 17 with the consoles 18 are made using overhead metal sheets 20. The flanges 19 at the ends of the arms 18 and the cross members 16 are reinforced with stiffeners 21.
Центральный элемент 11 и периферийные элементы 12 изготавливаются в заводских условиях. The central element 11 and the peripheral elements 12 are manufactured in the factory.
Центральный элемент 11 изготавливается следующим образом. К параллельным балкам 13 приваривается пластина 14 с отверстиями 15. К концам поперечин 16 перпендикулярно их осям привариваются и укрепляются ребрами 21 фланцы 19. Концы балок 13 попарно свариваются с поперечинами 16 с помощью накладных листов 20. The Central element 11 is made as follows. A plate 14 with holes 15 is welded to the parallel beams 13. Flanges 19 are welded to the ends of the cross members 16 and perpendicular to their axes. The ends of the beams 13 are welded in pairs with the cross members 16 using patch sheets 20.
Периферийный элемент 12 изготавливается следующим образом. В балках 17 высверливаются отверстия 9 для закрепления балок 17 и ростверка в целом на сваях 1. К концам консолей 18 перпендикулярно их
осям привариваются и укрепляются ребрами 21 фланцы 19. К каждой балке 17 с использованием накладных листов 20 привариваются консоли 18. The peripheral element 12 is made as follows. In the beams 17, holes 9 are drilled to fix the beams 17 and the grillage as a whole on piles 1. To the ends of the consoles 18 perpendicular to them the axes are welded and reinforced with ribs 21 of the flanges 19. Consoles 18 are welded to each beam 17 using patch sheets 20.
Готовые элементы 11 и 12 ростверка доставляются на место сооружения фундамента. Сваи 1 располагаются на месте сооружения фундамента согласно проектной разметке и поочередно вкручиваются в грунт, например, с помощью кабестана. При этом обеспечивается необходимая степень равенства уровней их верхних торцов. Finished elements 11 and 12 grillage are delivered to the foundation construction site. Piles 1 are located at the construction site of the foundation according to the design layout and are alternately screwed into the ground, for example, using a capstan. This ensures the necessary degree of equality of the levels of their upper ends.
Стаканы 4 надеваются вверх дном на голову сваи 1. В голове каждой сваи 1 имеются диаметрально выполненные отверстия (например, два таких отверстия). В диаметрально противоположных местах стенки стакана 4 имеются ответные отверстия 7, которые при надевании стакана 4 вверх дном 5 на голову сваи 1, устанавливаются соосно с диаметральными отверстиями, выполненными в голове сваи 1. В отверстия 7 стакана 4 и сваи 1 вводятся шпильки 6, которые фиксируются с двух сторон шплинтами. Штыри 8 узлов 3 при этом занимают вертикальное положение. The glasses 4 are put upside down on the head of the pile 1. In the head of each pile 1 there are diametrically made holes (for example, two such holes). In diametrically opposite places of the wall of the glass 4 there are mating holes 7, which when donning the glass 4 upside down 5 on the head of the pile 1, are installed coaxially with the diametrical holes made in the head of the pile 1. In the holes 7 of the glass 4 and piles 1 are inserted studs 6, which fixed on both sides with cotter pins. The pins 8 nodes 3 in this case occupy a vertical position.
Балки 17 периферийных элементов 12 устанавливаются на стыковочные узлы 3 так, что штыри 8, входят в вертикальные отверстия 9 и затем фиксируются в них с помощью крепежных гаек 10 (на фиг. 3 гайки 10 условно показаны навинченными на стержень 8). После этого фланцы 19 консолей 18 и поперечин 16 соединяются болтовыми соединениями. Возможна также установка на узлы 3 полностью собранного из элементов 11 и 12 ростверка 2 с предварительно сболченными фланцами 19.
The beams 17 of the peripheral elements 12 are installed on the docking nodes 3 so that the pins 8 enter the vertical holes 9 and then are fixed in them with the help of fixing nuts 10 (in Fig. 3, the nuts 10 are conditionally shown screwed onto the rod 8). After that, the flanges 19 of the consoles 18 and the cross members 16 are connected by bolted connections. It is also possible to install on nodes 3 a fully assembled grill 2 from elements 11 and 12 with previously flanged flanges 19.
Claims
1. Многосвайный фундамент, содержащий, по меньшей мере, две сваи и металлический ростверк, установленный на них с помощью стыковочных узлов, каждый из которых выполнен в виде стакана, закрепленного вверх дном на свае с помощью, по меньшей мере, одной шпильки, вставленной в соосные отверстия, выполненные в стенках стакана и голове сваи, и снабжен штырем, приваренным снаружи стакана к его дну и зафиксированным в вертикальном отверстии металлического ростверка. 1. A multi-pile foundation containing at least two piles and a metal grillage installed on them with the help of docking nodes, each of which is made in the form of a glass, mounted upside down on the pile using at least one hairpin inserted into coaxial holes made in the walls of the glass and the head of the pile, and is equipped with a pin welded from the outside of the glass to its bottom and fixed in a vertical hole of a metal grillage.
2. Фундамент по п. 1, в котором металлический ростверк содержит центральный элемент и два периферийных элемента, при этом центральный элемент выполнен сварным из двух параллельных балок, на которых закреплена пластина с отверстиями под фланцевое соединение с основанием башенной опоры, и двух приваренных к балкам поперечин, скрепляющих концы параллельных балок, каждый периферийный элемент выполнен в виде балки с вертикальными отверстиями под штырь стыковочного узла, к которой приварены две консоли, а концы консолей периферийного элемента и концы поперечин центрального элемента снабжены фланцами для болтового соединения друг с другом. 2. The foundation according to claim 1, in which the metal grillage contains a central element and two peripheral elements, while the central element is welded from two parallel beams on which a plate with holes for a flange connection to the base of the tower support is fixed, and two welded to the beams cross-members fastening the ends of parallel beams, each peripheral element is made in the form of a beam with vertical holes for the pin of the docking unit, to which two consoles are welded, and the ends of the consoles of the peripheral element and the ends of the cross members of the central element are provided with flanges for bolting to each other.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RU2011115149 | 2011-04-19 | ||
| RU2011115149 | 2011-04-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2012144927A1 true WO2012144927A1 (en) | 2012-10-26 |
Family
ID=45091543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/RU2011/000641 WO2012144927A1 (en) | 2011-04-19 | 2011-08-25 | Multi-pile tower support foundation |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE202011051316U1 (en) |
| WO (1) | WO2012144927A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113700368A (en) * | 2021-08-11 | 2021-11-26 | 国网电力科学研究院武汉南瑞有限责任公司 | Door-shaped composite material electric pole telescopic crossbeam assembly and assembling method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2495304A (en) * | 2011-10-05 | 2013-04-10 | Francis & Lewis Internat Ltd | Grillage installation apparatus and method |
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|---|---|---|---|---|
| SU387086A1 (en) * | 1971-04-05 | 1973-06-21 | METHOD OF CONSTRUCTION OF COLLECTION PILET ROLLER UNDER BUILDING, CONSTRUCTION | |
| WO1993018253A1 (en) * | 1992-03-12 | 1993-09-16 | Roeynestad Tom Toralv | Mast base |
| RU86200U1 (en) * | 2009-04-13 | 2009-08-27 | Открытое Акционерное Общество "Федеральная Сетевая Компания Единой Энергетической Системы" (Оао "Фск Еэс") | METALLIC MORTGAGE OF MULTI-PILED FOUNDATION FOUNDATION OF THE SUPPORT OF THE ELECTRIC TRANSMISSION LINE |
-
2011
- 2011-08-25 WO PCT/RU2011/000641 patent/WO2012144927A1/en active Application Filing
- 2011-09-16 DE DE201120051316 patent/DE202011051316U1/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU387086A1 (en) * | 1971-04-05 | 1973-06-21 | METHOD OF CONSTRUCTION OF COLLECTION PILET ROLLER UNDER BUILDING, CONSTRUCTION | |
| WO1993018253A1 (en) * | 1992-03-12 | 1993-09-16 | Roeynestad Tom Toralv | Mast base |
| RU86200U1 (en) * | 2009-04-13 | 2009-08-27 | Открытое Акционерное Общество "Федеральная Сетевая Компания Единой Энергетической Системы" (Оао "Фск Еэс") | METALLIC MORTGAGE OF MULTI-PILED FOUNDATION FOUNDATION OF THE SUPPORT OF THE ELECTRIC TRANSMISSION LINE |
Non-Patent Citations (1)
| Title |
|---|
| "Tipovye konstruktsii, izdeleniya i uzly zdanii i sooruzhenii.", UNIFITSIROVANNYE KONSTRUKTSII SVAYNYKH FUNDAMENTOV DLYA STALNYKH OPOR, vol. 35-500, no. 27 OT, 28 March 1988 (1988-03-28), pages 35, 36 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113700368A (en) * | 2021-08-11 | 2021-11-26 | 国网电力科学研究院武汉南瑞有限责任公司 | Door-shaped composite material electric pole telescopic crossbeam assembly and assembling method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| DE202011051316U1 (en) | 2011-10-28 |
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