RU230989U1 - Fixing device for power transmission line support - Google Patents

Abstract

The utility model relates to elements of building structures, is intended for transmission line supports and can be used in the construction of precast-monolithic foundations for transmission line supports. A fixing device for a transmission line support is declared, having a mushroom shape and consisting of a horizontally oriented plate and a post. A platform is welded to the upper end of the post, made with the possibility of connecting to the transmission line support, the plate and the platform are provided with stiffening ribs having the shape of triangles with cut corners, two sides of which are welded to the plate and to the post, to the post and to the platform, respectively. All elements of the fixing device are made of metal. The post is made inclined and consists of two parts connected by means of a flange joint, for which purpose a flange is welded to the bottom of the post, and a counter flange is welded to the top of the post, the connection of which is made by means of fasteners secured in the aligned holes of the flanges, wherein the flange and the counter flange are provided with stiffening ribs having the shape of triangles with cut corners, two sides of which are welded to the post and to the flange, to the post and the counter flange, respectively. The post has a square cross-section. The technical result consists in increasing the strength of the structure of the fixing device for the transmission line support while reducing its material consumption, ensuring its quick and easy installation regardless of the terrain and climatic characteristics of the area, including on any types of soil. 7 cl., 6 fig.

Description

The utility model relates to elements of building structures, is intended for supports of power transmission lines and can be used in the construction of precast-monolithic foundations for supports of power transmission lines.

LEVEL OF TECHNOLOGY

Transmission line supports are one of the most complex elements of a power transmission line (PTL). When designing and constructing these structures, it is necessary to take into account both the climatic and soil characteristics of the area. Currently, developers of supports and their elements strive to reduce the cost of production and improve the strength characteristics of products.

To ensure strength, transmission line supports can be secured to fixing devices (footrests, bases, foundations, etc.), which are reinforced concrete or metal structures, usually mushroom-shaped, with bolts or holes for fastening transmission line supports. Transmission line supports over 6 m must be accompanied by fixing devices.

Various structural elements intended for fixing transmission line supports are known from the prior art.

Thus, patent RU56905U1, published on September 27, 2006, discloses a shallow metal foundation consisting of metal elements and parts, contains a horizontal support element and vertical stiffening ribs fixed to it from above, supporting the supporting parts installed above for the structures of the above-ground part of the building. The shallow metal foundation can be equipped with distribution elements for combining it into joint work with adjacent shallow metal foundations. The cavities formed by the elements and parts of the shallow metal foundation can be concreted. The elements and parts of the shallow metal foundation can be protected with an anti-corrosion coating. The technical solution ensures an increase in the bearing capacity of the shallow metal foundation and, due to this, an expansion of the area of its possible use, including for the construction of buildings and structures for various purposes in areas where permafrost soils are widespread.

In addition, an invention is known (patent WO2010047618, published on 29.04.2010), which relates to the field of construction, namely, to shallow foundations, and can be used in the construction of precast-monolithic foundations for columns, supports, masts, power transmission line supports, etc., erected on a natural or artificial base during the construction of buildings and structures for various purposes, including when constructing strip or columnar foundations. The technical task of the invention is to simplify the design, reduce the metal consumption and increase the bearing capacity of a shallow foundation erected for a column, support, mast, power transmission line support on a natural or artificial base, including when constructing strip or columnar foundations. The task is solved by the fact that in the proposed technical solution the support part is equipped with lower and upper reinforcement meshes, and the stiffening ribs are placed in the form of at least three rays coming out of one center located on the vertical axis of the foundation, are made in the form of bent sections and are provided with stiffening elements, and the stiffening ribs are installed between the lower and upper reinforcement meshes, and the elements of connection of the column structure to the foundation part are made in the form of reinforcement leads. In addition, the bent profile of the stiffening rib is made in the form of a sinusoid, and the stiffening elements are installed along each stiffening rib in pairs on both sides.

Patent RU2451136C1, published on 20.05.2012, discloses a foundation for a power transmission line support and a method for increasing its durability. The foundation for a power transmission line support includes a support plate and a post located on it. The thickness of the concrete protective layer to the working reinforcement of the post is variable and changes depending on the operating conditions of the concrete along the height of the post. The technical result consists in increasing durability and reducing operating costs.

There is also a known utility model (RU181319U1, published 10.07.2018), which relates to the field of construction, namely to the construction of mushroom foundations, and can be used in the installation of overhead power lines for the construction of foundations for metal, reinforced concrete or combined pillars or supports.

The mushroom-shaped foundation comprises a support plate and a post installed on it, connected to the support plate by means of a bolted connection. The post has two fastening plates protruding horizontally on both sides relative to the post, and in each of which three holes are made. In this case, the support plate in the central part has an elevation in the form of a truncated pyramid, in which six fastening bolts are installed, placed in the said holes of the fastening plates. Moreover, the fastening plates are fixed with nuts. The technical result is an increase in the strength and durability of the structure.

The utility model (RU181281U1, published 09.07.2018) relates to the field of construction, namely to the structures of mushroom-shaped foundations, and can be used in the installation of overhead power lines for the construction of foundations for metal, reinforced concrete or combined posts or supports. The foundation comprises a support plate and a post connected to it, tapering towards the top. The support plate is provided with two horizontal keyways, and the post is provided with horizontal projections in the lower part on both sides, located in the said keyways. In this case, the horizontal projections of the post have a wedge-shaped profile with a narrowing in the peripheral direction relative to the post axis and are located in the keyways, ensuring direct contact of the outer surface of the horizontal projections with the inner surface of the keyways, having a geometry that matches the horizontal projections of the post. The technical result is a simplification of the assembly and installation of the foundation.

The disadvantages of the given analogues are the massiveness and bulkiness of the structure as a whole, the cost of their transportation to the site, as well as the duration and complexity of assembly due to the complexity of the geometry of their elements.

The closest analogue of the proposed utility model is the technical solution known from patent document RU215200U1, published on 02.12.2022. This source discloses a utility model that relates to elements of building structures, is intended for power transmission line supports and can be used in the construction of precast-monolithic foundations for power transmission line supports. A fixing device for a power transmission line support is declared, having a mushroom shape and consisting of a horizontally oriented plate and a vertically oriented post, made with the possibility of a bolted connection. The bolted connection is ensured by means of a sleeve welded to the plate and a coupling welded to the post; a platform is welded to the upper end of the post, made with the possibility of connection to the power transmission line support. The plate and the platform are provided with stiffening ribs, wherein the stiffening ribs have the form of right-angled triangles with cut off sharp corners, the legs of which are welded to the plate and to the bushing, to the post and the platform, respectively, wherein all elements of the fixing device are made of metal. The technical result is to increase the strength, stability and reliability of the fixing device for the transmission line support; ensuring the possibility of quick installation of a stable structure of the fixing device for the transmission line support regardless of the terrain and climatic characteristics of the area.

The disadvantage of the closest analogue is, first of all, the impossibility of installing a fixing device for a transmission line support in soils prone to horizontal shifts, such as marshy, silty, sandy soils. In cases where lateral loads act on the support and the fixing device, such as for anchor-angle supports, the load received from the support may be incorrectly distributed. In addition, one can point out the labor intensity of ensuring a strong and reliable coupling connection, and the larger the pipe size, the more effort must be applied during assembly and installation, and the significant weight of the structure complicates the assembly, storage and transportation of the product.

Thus, the analysis of the state of the art showed that there is a need to create a fixing device for a power transmission line support that would eliminate all the above-mentioned disadvantages of known solutions.

DISCLOSURE OF UTILITY MODEL

The technical result, which the proposed solution is aimed at achieving, is an increase in the strength of the structure of the fixing device for the transmission line support while reducing its material consumption, ensuring its quick and easy installation regardless of the terrain and climatic characteristics of the area, including on any type of soil.

The claimed technical result is achieved in that a fixing device is proposed for a transmission line support, having a mushroom shape and consisting of a horizontally oriented plate and a post, a platform is welded to the upper end of the post, made with the possibility of connecting to the transmission line support, the plate and the platform are provided with stiffening ribs having the shape of triangles with cut corners, two sides of which are welded to the plate and to the post, to the post and to the platform, respectively, all elements of the fixing device are made of metal, the post is made inclined and consisting of two parts connected by means of a flange connection, for which a flange is welded to the lower part of the post, and a counter flange is welded to the upper part of the post, the connection of which is made by means of fasteners secured in the aligned holes of the flanges, wherein the flange and the counter flange are provided with stiffening ribs having the shape of triangles with cut corners, two sides of which are welded to the post and to the flange, to the post and the counter flange Accordingly, the rack has a square cross-section.

The angle of the stand is from 3 to 20 degrees, preferably from 4 to 16 degrees.

The flange and the counter flange are welded coaxially to the rack and are made in the form of rings of the same diameter.

The plate has a quadrangle cross-section with right angles, and the platform is square and has round through holes. The platform is made with a 45-degree turn relative to the plate.

The number of stiffening ribs of the plate, platform and flanges is a multiple of two, and the angle between the stiffening ribs can be calculated using the formula: angle between stiffening ribs = 360 degrees/number of stiffening ribs.

The side of the plate is 3.1-3.3 times the side of the platform, the height of the plate with the lower part of the post and flange welded to it is 0.2-0.23 times the height of the upper part of the post with the counter flange welded to it, and the height of the fixing device as a whole is related to the side of the plate as 1.7-2.0 to 1.

All elements of the fixing device can be coated with an anti-corrosion coating with a layer thickness of 100-150 microns.

BRIEF DESCRIPTION OF DRAWINGS

Fig. 1 shows a general view of the fixing device.

Fig. 2A-2B shows section A-A, shown in the general view of the fixing device: Fig. 2A – direct position of the platform relative to the plate, Fig. 2B – position of the platform relative to the plate with a 45 degree turn.

Fig. 3A and 3B show section B-B, shown in the general view of the fixing device: Fig. 3A – plate in rectangular section, Fig. 3B – plate in square section.

Fig. 4 shows a section C-C shown in the general view of the fixing device.

The following positions are indicated on the drawings: plate (1), rack (2), flange (3), mating flange (4), platform (5), round through holes (6) of the platform, stiffening ribs (7) of the plate, stiffening ribs (8) of the platform, stiffening ribs (9) of the flanges, round through holes (10) of the flanges, fasteners (11).

ESSENCE OF A UTILITY MODEL

The claimed solution is a fixing device for a power transmission line support, which has a mushroom shape and is a structure consisting of a plate (1) and a post (2) (Fig. 1).

The plate (1) is made horizontally oriented (Fig. 1) in the form of a metal sheet, i.e. made of metals or their alloys. The thickness of the plate (1) can be from 10 to 18 mm, most preferably from 14 to 16 mm. The plate (1) has a cross-section of a quadrangle with right angles, i.e. a rectangle or a square (Fig. 3A-3B).

The stand (2) is a square-section pipe (Fig. 1-4). The stand (2) is made of metal, i.e. metals or their alloys. The side size of the stand (2) can be from 219 to 530 mm, most preferably from 219 to 325 mm, the thickness of the pipe walls can vary from 8 to 16 mm.

This design of the square section post (2) more effectively implements the strength of the material from which it is made, without the need to make the elements of the device and the entire structure heavier and more complex, which allows for a reduction in the material consumption of the fixing device for the transmission line support and, accordingly, its weight, without losing its strength, reliability and stability, which in turn ensures easy and quick installation of the structure regardless of the terrain and climatic characteristics of the area, including on any type of soil, and, as a result, increases the convenience of its storage and transportation.

The rack (2) is divided into two parts - lower and upper, connected to each other by a flange joint. The dimensions of the sides of the upper and lower parts of the rack (2) are the same.

The lower part of the rack (2) is welded with its lower end to the center of the plate (1) (Fig. 1, 3A-3B), and a flange (3) made in the form of a ring with round through holes (10) (Fig. 1, 4) is welded to the upper end of the lower part of the rack (2). The flange (3) is welded coaxially to the rack (2).

The design of the plate (1) with the lower part of the post (3) welded to it with a flange (3) increases the strength of the plate (1) and the device as a whole, providing a strong, reliable and stable connection with the post (2) without weakening the plate (1) itself with holes.

At the lower end of the upper part of the rack (2) a counter flange (4) is welded, made in the form of a ring with round through holes (10) (Fig. 1, 4). The counter flange (4) is welded coaxially to the rack (2).

The flange (3) and the counter flange (4) have the same diameter.

The flange connection is provided by connecting the flange (3) and the counter flange (4) by means of fasteners (11) secured in the aligned openings (10) of the flange (3) and the counter flange (4) (Fig. 1). Any fasteners applicable for flange connections, in particular bolts, studs, nuts, etc., can act as fasteners (11). The flange connection (of the flange (3) and the counter flange (4)) is made coaxially with the post (2).

The described design of the stand (2) with a flange connection ensures a more reliable and hermetic fastening of the device parts compared to other connections, minimizes the likelihood of gaps, play, creates greater strength in the connection unit without the need to make the elements of the device and the entire structure heavier and more complex, which in turn ensures quick and easy assembly and installation of the structure regardless of the terrain and climatic characteristics of the area, including on any type of soil.

At the upper end of the upper part of the stand (2) a square-shaped platform (5) is welded (Fig. 1, 2A, 4).

For connection to the transmission line support, the platform (5) is provided with round through holes (6) (Fig. 2). The round through holes (8) are provided with fasteners (9) in the form of bolts with washers and nuts (not shown).

The design of the upper part of the rack (2) with a counter flange (4) and platform (5) welded to it increases the strength of the rack (2) and the device as a whole, ensuring a strong, reliable and stable connection with the plate (1) and the transmission line support without weakening the rack (2) itself with holes.

In a particular case of the embodiment of the utility model, for example, in cases of using anchor supports for power transmission lines, the platform (5) can be made with a 45-degree turn relative to the plate (1) (illustrated in Fig. 2B).

The stand (2) is made with an inclination. The angle of inclination relative to the vertical (Fig. 1, angle α) is from 3 to 20 degrees, preferably from 4 to 16 degrees. The coaxiality of the stand (2) with the bushing (3) and the coupling (4) implies that the bushing (3) and the coupling (4) are also made at an inclination, with an inclination angle α of from 3 to 20 degrees.

Such inclined design of the post (2) and flange connection allows to minimize horizontal pressure on the support, provides stability to the whole device and the ability to withstand horizontal impacts that occur in mobile soils. When a horizontal load acts on the inclined structure, it experiences a smaller bending moment than the vertical structure, due to which the fixing device with an inclined post (2) and flange connection has greater stability, strength and reliability, including in problematic soils, in cases of installation of the structure in zones of seismic activity, strong winds and other external impacts, and also more effectively implements the strength of the material from which it is made, without the need to weigh down and complicate the elements of the device and the entire structure as a whole. That is, the noted features allow to increase the strength of the structure while reducing its material consumption, which in turn ensures easy and quick installation of the structure regardless of the terrain and climatic characteristics of the area, including on any type of soil.

The cavity of the stand pipe (2) can be filled with filler. A standard filler applicable for filling building structures, such as hydrophobic polyurethane foam, can be selected as the filler.

The plate (1), platform (5), flange (3) and counter flange (4) are provided with stiffening ribs (7, 8, 9) (Fig. 1-4).

On the plate (1) there are stiffening ribs (7) having the shape of a triangle with cut corners (Fig. 1, 3A-3B). Two sides of the stiffening ribs (7) are fixed to the plate (1) and the lower part of the rack (2) by welding (welding is indicated in Fig. 1).

On the platform (5) there are stiffening ribs (8) having the shape of a triangle with cut corners (Fig. 1, 2). Two sides of the stiffening ribs (8) are fixed on the platform (5) and the upper part of the rack (2) by welding (welding is indicated in Fig. 1, 2).

On the flange (3) and the counter flange (4) there are stiffening ribs (9) having the shape of a triangle with cut corners (Fig. 1, 4). Two sides of the stiffening ribs (9) are fixed on the flanges (3, 4) and the upper and lower parts of the rack (2) by welding (welding is indicated in Fig. 1).

The stiffening ribs (7, 8, 9) and their design increase the strength, reliability, stability and safety of the fixing device as a whole, ensuring a reliable rigid connection of all elements of the device, which in turn ensures quick and easy installation of the structure regardless of the terrain and climatic characteristics of the area, including on any type of soil.

The number of stiffening ribs (7, 8, 9) is a multiple of two, and the angle between the stiffening ribs can be calculated using the formula: angle between stiffening ribs = 360 degrees/number of stiffening ribs. For example, with the number of stiffening ribs (7, 8, 9) equal to four, the angle between them is 90 degrees, with six stiffening ribs (7, 8, 9) the angle between them is 60 degrees, with eight - 45 degrees, etc. Fig. 1 illustrates an embodiment of the utility model with eight stiffening ribs (7), four stiffening ribs (8) and four stiffening ribs (9) of the flange (3) and the mating flange (4). The number of stiffening ribs (7, 8, 9) can be the same.

All elements of the fixing device (plate (1), stand (2), flange (3), counter flange (4), platform (5), stiffening ribs (7, 8, 9)) are made of metal, i.e. from metals or their alloys. Metals and their alloys have the necessary structural strength (structural strength is a complex characteristic of a material that combines the criteria of strength, rigidity, reliability and durability). Iron or steel can act as metals or their alloys.

To protect against mechanical and/or chemical impacts, all elements of the fixing device can be coated with an anti-corrosion coating with a layer thickness of 100-150 µm. Any standard coating applicable for the protection of building metal structures can be selected as an anti-corrosion coating, for example, a two-component paint based on modified epoxy.

In particular cases of the proposed technical solution, the ratio of the dimensions of the fixing device is as follows. The side of the plate (1) is 3.1-3.3 of the side of the platform (5), the height of the plate (1) with the lower part of the post (2) and flange (3) welded to it is 0.2-0.23 of the height of the upper part of the post (2) with the counter flange (4) welded to it, and the height of the fixing device as a whole is related to the side of the plate (1) as 1.7-2.0 to 1.

The utility model according to the proposed technical solution can be completely manufactured in factory conditions. High structural strength of all elements of the fixing device, their shape and mutual arrangement (including the square section of the rack and its slope), the use of a flange connection of parts of the fixing device allow to increase the strength of the device as a whole while reducing its material consumption and its weight, which increases the convenience of its storage and transportation, extends the service life of the device and the safety of its use. Also, the specified features of the fixing device allow to simplify the process and reduce the time of installation of the device in any weather conditions and on any soil, i.e. they determine the possibility of quick and easy stable installation regardless of the terrain and climatic characteristics of the area, including on any type of soil.

IMPLEMENTATION OF A UTILITY MODEL

To verify the implementation of the stated purpose and the achievement of the stated technical results, several batches of fixing devices for transmission line supports were manufactured according to the proposed utility model.

All fixing devices were made in the form of a mushroom-shaped horizontally oriented plate and an inclined post. The post was made of square cross-section. A platform with round through holes for connection to the transmission line support was welded to the upper end of the post. The plate and the platform were provided with stiffening ribs in the form of triangles with cut corners. The plate stiffening ribs were welded on two sides to the post and to the plate, and the platform stiffening ribs were welded to the post and to the platform. All elements of the fixing device were made of metal. The post was made with an inclination and the possibility of a flange connection consisting of two parts, which was ensured by means of a flange welded to the lower part of the post and a counter flange welded to the upper part of the post. The flanges were provided with stiffening ribs in the form of triangles with cut corners, two sides of which were welded to the post and to the flange/counter flange, respectively. The flange and the counter flange were welded coaxially to the rack and connected to each other with fasteners secured in the aligned holes of the flanges.

To illustrate the implementation of the claimed utility model, Table 1 provides data on 4 manufactured structures.

Table 1

Design 1 Construction 2 Construction 3 Construction 4 Material of manufacture steel* steel* iron steel* Number of holes in the platform 4 4 2 4 Number of flange stiffeners 4 4 2 6 Number of plate stiffening ribs 8 8 4 8 Number of platform stiffeners 4 4 4 6 Rack tilt angle, deg. ** 8 8 6 11 Plate side, mm 1500 1500/3000*** 1450 2000 Side of the platform, mm 500 500 450 550 Height of the upper part of the rack with a counter flange, mm 2450 2450 2300 2800 Height of plate with lower part of stand and flange, mm 500 500 450 600 Height of the device, mm 2950 2950 2750 3400

* - steel C245, C345, C355 according to GOST 27772 with impact toughness in accordance with SP16.13330,

** - designs with inclination angles of 3, 10, 18, 20 degrees were also manufactured and tested.

*** - rectangular in cross-section.

In Constructions 2, 3 and 4, the hollow elements (bushing, rack) were filled in factory conditions with hydrophobic polyurethane foam "VLADIPUR 3021" or analogues, with a density of 20-40 kg/m³. Anti-corrosion protection was applied in factory conditions to Constructions 2-4 with two-component paint "PRIMAPOX" of all modifications or analogues, the layer on Construction 2 was made 100 μm thick, on Construction 3 - 150 μm thick, on Construction 4 - 120 μm thick.

Experiments on each design were conducted on different types of terrain (ordinary soil, coarse-grained and rocky soil, permafrost, marshy soil) and with different types of transmission line supports (anchor, corner, intermediate, transition and special). In some experiments, conditions were created for the impact of lateral loads on the installed structures.

The results of the experiments showed the strength of structures 1-4 of the fixing device for the transmission line support - on average by 15% regardless of the type of support, terrain and climatic characteristics of the area (including lateral loads and on soils prone to horizontal shifts). At the same time, the tests showed that an increase in strength was recorded with a decrease in the material intensity of the fixing device (reduction in material consumption and weight of structures) - compared to the original model (the closest analogue) in all structures 1-4 by an average of 15-17%.

In addition, as a result of the tests, it was determined that the proposed design of the fixing device for the transmission line support ensures the possibility of its quick and easy installation regardless of the terrain and climatic characteristics of the area, including on any type of soil (installation time was reduced by an average of 15% in normal soil, and by 10-12% in permafrost conditions).

Additionally, an increase in the convenience of storage and transportation of the fixing device for the power transmission line support was identified (easier and more convenient stacking of finished products).

Thus, the declared utility model allows achieving all the declared technical results.

Claims (8)

1. A fixing device for a transmission line support, having a mushroom shape and consisting of a horizontally oriented plate and a post, a platform welded to the upper end of the post, configured to connect to the transmission line support, the plate and the platform are provided with stiffening ribs in the form of triangles with cut corners, two sides of which are welded to the plate and to the post, to the post and to the platform, respectively, all elements of the fixing device are made of metal, the post is made inclined and consisting of two parts connected by means of a flange connection, for which a flange is welded to the lower part of the post, and a counter flange is welded to the upper part of the post, the connection of which is made by means of fasteners secured in the aligned holes of the flanges, wherein the flange and the counter flange are provided with stiffening ribs in the form of triangles with cut corners, two sides of which are welded to the post and to the flange, to the post and the counter flange, respectively, wherein the post has a square section. 2. The device according to item 1, characterized in that the angle of inclination of the rack is from 3 to 20 degrees, preferably from 4 to 16 degrees. 3. The device according to item 1, characterized in that the flange and the counter flange are welded coaxially to the rack and are made in the form of rings of the same diameter. 4. The device according to item 1, characterized in that the plate has a cross-section in the form of a quadrangle with right angles, and the platform is made square and provided with round through holes. 5. The device according to item 1, characterized in that the platform is made with a 45-degree turn relative to the plate. 6. The device according to item 1, characterized in that the number of stiffening ribs of the plate, platform and flanges is a multiple of two, and the angle between the stiffening ribs is calculated using the formula: angle between stiffening ribs = 360 degrees/number of stiffening ribs. 7. The device according to item 1, characterized in that the side of the plate is 3.1-3.3 of the side of the platform, the height of the plate with the lower part of the post welded to it and the flange is 0.2-0.23 of the height of the upper part of the post with the counter flange welded to it, and the height of the fixing device as a whole is related to the side of the plate as 1.7-2.0 to 1. 8. The device according to item 1, characterized in that all elements of the fixing device are coated with an anti-corrosion coating with a layer thickness of 100-150 microns.