RU153340U1 - THE BASE OF REUSABLE USE UNDER THE COMPOSITE SUPPORT OF THE ELECTRIC TRANSMISSION LINE - Google Patents

Abstract

1. The foundation is reusable under the composite support of the power line, installed in the ground, containing a grillage with a mount for the support pillar, combining the upper parts of at least two screw piles, each screw pile includes a cylindrical barrel with means for screwing and unscrewing the piles, supporting a washer and a tip with a screw blade, characterized in that the central part of the grillage has a through hole, the surface of which is mated to the lower part of the support strut, under the lower end of the cat A thrust bearing is mounted rigidly connected by rods with a grillage, and each screw pile contains a collapsible means of fastening to the grillage, the screw blade of the pile is made with a varying diameter from minimum to maximum and again to the minimum diameter in the direction from the tip to the pile shaft. 2. The reusable foundation according to claim 1, characterized in that the grillage is made integral and includes means for fastening the grillage parts to each other.

Description

Reusable foundation for composite power line support

The utility model relates to the field of construction, to the construction of supports for overhead power lines, and can be used in the construction of reusable foundations based on screw piles for composite supports of power lines, mainly 6 (10) kV-20 kV.

Composite supports for high-voltage power lines made of a fiberglass (basalt-plastic) composition are dielectrics, have a significantly lower mass, high mechanical strength and flexibility, corrosion resistance, resistance to the ultraviolet spectrum of irradiation and solar radiation. These properties determine the use of composite supports in difficult climatic conditions, inaccessible (forest, marshy and mountainous) terrain to create a quick-mount emergency reserve during emergency recovery operations. Intermediate power line poles of voltage class 6 (10) kV-20 kV have a mass of about 150-250 kg, and isogrid poles - less than 100 kg, which allows the transportation and installation of such poles without the use of heavy equipment. Composite supports for the highest stress classes are usually made modular. At the same time, the mass of each module allows it to be transported by forces of 3 to 4 people or using hand trucks. To ensure that the pillar stands are protected against ground fire, on the outside of the bottom

the support module is coated with a flame retardant to a height of at least 2 m from the surface of the earth.

The small weight of the composite pillar racks facilitates their repeated use, especially when transferring overhead power lines. Relocation of supports is required, for example, when expanding roads, when the place occupied by the power line is allocated to the roadbed or there is a need for removal of supports during the construction of any roadside infrastructure, for example, gas stations. Currently, for this purpose, the demolition of the old and the construction of a new line at a new location is being carried out. As a rule, supports, wires and fittings whose service life has not yet expired are not reused.

Known composite support, from assembled hollow truncated cones made of composite material, the joints of which are interconnected by exhaust rivets [patent RU 131777]. The assembly of hollow cones is carried out using the device [patent RU 120991].

With all of the above positive characteristics of composite supports, their installation in the ground requires the installation of a reliable foundation, which, as a rule, cannot be tolerated during the transfer of supports. Most of the known foundations are non-separable, which eliminates the transfer of supports without destroying the foundation. The existing collapsible types of foundations require the use of equipment for disassembly / assembly, which nullifies many of the advantages of composite supports. So, to extract the rod elements from the ground, powerful jacks or, for example, a device [patent RU 20202207] should be used.

Racks of supports are installed either directly by deepening into the ground, or on foundations under the racks of supports,

which, as a rule, are performed by pouring the stand with concrete: into a previously prepared well; into a pre-installed glass; around a pre-installed reinforced concrete pile [patent RU 131015]; around installed anchor elements in the form of beams laid on the bottom of the pit [patent RU 121516], as well as by rigidly binding the support strut to the pre-installed screw supports [patent RU 59651], [Typical design. Intermediate composite supports for single-circuit and double-circuit 110 kV overhead lines using insulating traverses, TP5772-045. CJSC "PHOENIX-88", 2013, l. fourteen]. In the latter case, the rigid connection also performs the functions of a grillage. A variant with flange mounting of the support strut to the foundation or grillage is also possible [http://tdgsem.ru/kompozitnye-opory].

Modern single-piled and multi-piled foundations for support pillars are increasingly performed on various types of metal screw piles immersed in the ground: narrow-bladed, broad-bladed, etc., which are the main bearing part of the foundations regardless of their design, calculation methods and construction. The metal parts of piles in contact with the soil are susceptible to corrosion, for protection against which anti-corrosion and polymer coatings are applied to the outer surfaces, or fiberglass piles are made [patent RU 145340].

Known screw pile [RU 114693], designed for the device of the foundations of the supports of power lines, in which the screw blade is made with a decrease in diameter towards the top of the conical tip. The pile is immersed in the ground under the influence of only torque, without additional loading. Piles with a trunk diameter of up to 114 mm can be manually screwed into the ground. Disadvantage is

lack of structural elements that facilitate unscrewing piles for its reusable use.

The closest technical solution is the pile foundation [patent RU 120427], which contains a grillage with a support under the power transmission tower pillar, combining the upper ends of at least two metal screw piles. The device allows for flange or pin mounting of the support strut. The closest technical solution does not provide reusable use of the foundation. In addition, the large weight of the components and the device as a whole makes it difficult to install and carry, especially when using composite supports in hard-to-reach conditions. These shortcomings are caused by the fact that screw piles do not have structural elements that facilitate unscrewing piles, lifting the foundation from the ground without the use of special heavy equipment installed on excavators and other heavy machines.

The technical result of the claimed group of utility models is the multiple use of the foundation for composite supports of power lines without the use of special heavy equipment. A concomitant technical result is a decrease in the complexity of extracting the foundation with support from the ground.

The specified technical result is achieved in that the foundation of reusable use for a composite support of a power transmission line installed in the ground contains a grillage with a mount under the support column, combining the upper parts of at least two screw piles, each screw pile includes a cylindrical barrel with means for screwing and unscrewing piles, support washer and tip with screw

with a blade, the central part of the grillage has a through hole, the surface of which is reciprocal to the lower part of the pillar of support, under the lower end of which there is a thrust bearing, rigidly connected by rods with the grillage, and each screw pile contains a collapsible means of attachment to the grillage, the screw blade of the pile is made with varying diameters from minimum to maximum and again to minimum diameter in the direction from the tip to the pile shaft. The achievement of the specified technical result is also facilitated by the fact that the grillage is made integral and includes means for fastening the grillage parts to each other.

The essential features of the claimed utility model are:

- A grillage with a support under a support column, combining the upper parts of at least two screw piles. The grillage provides a rigid connection of screw piles with the fastening of the support pillar. The number of piles is selected based on the strength of the support strut support in the ground. The piles are arranged evenly around the circumference relative to the axis of the support strut. The minimum number of piles is two, and their uniform circumference is due to the creation of the resulting force from screwing / unscrewing the screw piles passing through the axis of the support strut. This eliminates the skew of the support pillar.

- Each screw pile includes a cylindrical shaft with means for screwing and unscrewing the piles, a support washer and a tip with a screw blade. The cylindrical barrel provides the transmission of torque applied to the means of screwing and unscrewing the piles installed in the transverse hole on the shaft end to the tip with a helical blade. As a means of screwing and

Unscrewing can be used with an end head with an internal square socket and a cylindrical pin, placed in the transverse hole of the cylindrical barrel. The support washer serves as a limiter for the position of the grillage in height. In the process of screwing or unscrewing, the screw blade is buried in the ground and provides a reliable fixation of the pile or leaves the soil and raises (releases) the pile.

- The central part of the grillage has a through hole, the surface of which is made reciprocal to the lower part of the support strut. In the central hole of the grillage, the lower part of the support strut is placed, part of which is located in the ground. As a rule, the lower part of the support strut is cylindrical or conical. The counter surface provides tight contact between the grillage and the lower part of the support strut and increases the reliability of installation of the support strut. To protect the surface of the lower part of the support pillar in contact with the grillage, it is possible to use gaskets. The presence of a through hole can significantly reduce the weight of the grillage, which facilitates its lifting and transportation, but at the same time slightly reduces its strength and rigidity.

- Under the lower end (the lower part of the support strut) there is a thrust bearing, rigidly connected by rods to the grillage. The thrust bearing with the help of rods when unscrewing the screw piles ensures the transfer of the force to pull out the grillage together with the support leg from the ground to the lower end of the support strut. The location of the thrust bearing under the lower end of the support strut provides a distribution of the pulling force of the support strut over the entire cross section of its lower part. The dimensions of the thrust bearing in cross section exceed the dimensions of the lower end.

- Each screw pile contains a collapsible means of attachment to the grillage. The fastener provides the necessary strong and rigid connection of the cylindrical shaft of the screw pile and grillage. As a collapsible fastening means, for example, a cylindrical connection of a pile shaft with a grillage using a bolted flange connection through a support washer of a screw pile is used. For this purpose, a hole is made in the grill for the cylindrical shaft of the pile, and in the support washer and in the grill, coaxial holes are made for the bolt connection. The fastening means limits the movement of the grillage relative to the cylindrical shank of each pile up and down. Sideways movement is limited by the gap between the pile shank and the grillage.

- The helical blade is made with a varying diameter from minimum to maximum and again to a minimum diameter in the direction from the tip to the pile shaft. The implementation of the blade with a varying diameter from minimum to maximum provides the possibility of immersion (screwing) piles into the ground without additional load and the use of special heavy equipment. The implementation of the blade with additional turns (1-1.4 turns), having a varying diameter from maximum to minimum, limited by the diametrical size of the pile shaft, facilitates the process of unscrewing the pile if it is necessary to disassemble and transfer the foundation. At the same time, the moment of screwing up the pile increases slightly due to the reduction of the sliding friction of the periphery of the additional turns of the blade on the ground previously cut by the previous turns, and each subsequent point of the periphery of the additional turns of the blade is located at a radius smaller than the radius of the previous point.

However, the strength of the piling is even slightly increased due to the presence of additional turns of the blade.

- The grillage is made integral and includes means for fastening the grillage parts to each other. Performing a compound grillage enables the lifting and transportation of its parts without the use of heavy equipment.

The essential distinguishing features of a utility model that affect the receipt of a technical result is:

- The central part of the grillage has a through hole, the surface of which is made reciprocal to the lower part of the support strut.

- Under the bottom end (bottom of the support pillar) there is a thrust bearing, rigidly connected by rods to the grillage.

- Each screw pile contains a collapsible means of attachment to the grillage.

- The screw blade of the pile is made with a varying diameter from minimum to maximum and again to a minimum diameter in the direction from the tip to the pile shaft.

The essence of the group of utility models is illustrated by drawings. In FIG. Figure 1 shows an example of a section of the foundation with the fastening of a conical support pillar in the ground, in a collapsible grillage installed on two screw piles. In FIG. 2 shows an orthogonal section of the foundation of FIG. 1. In FIG. 3 shows a top view of the foundation of FIG. 1. In FIG. 4 shows a top view of the head of a screw support with a face head installed in it (grillage, plug and soil are not conventionally shown).

The foundation consists of a grillage 1, or grillage assembled from parts 2, of screw piles, each of which includes: a cylindrical shaft 3, a tip 4, a helical blade 5 with sections 6 and 7 with a varying diameter from minimum to maximum and from maximum to minimum, respectively , a supporting washer 8 with holes 9, an end head 10 with a finger 11, a bolt connection of fastening the piles to the grill 12, and also includes means for fastening the parts of the grill to each other 13, plugs 14, rods 15, thrust bearing 16. In FIG. 1-4 are also shown: the lower part of the pillar of the support 17, the surface 18 of the grillage corresponding to the outer surface of the lower part of the conical pillar of the support, the separation film 19, the filler 20. The letters in FIG. 1-4 are marked: d - the diameter of the finger 11, D - the diameter of the borehole for installing the support strut 17, □ S - the size of the square socket in the socket head 10.

The grillage 1, as a rule, is made of solid metal or collapsible, consisting of parts 2, the number of which is mainly equal to the number of screw piles, but it can be made, for example, of fiberglass or basalt plastic, which reduces its weight. The means of fastening the parts of the grillage is made, for example, in the form of a bolted connection 13. The grillage may contain embedded elements that increase its rigidity and strength. The grillage can be made high, located above the ground level, raised when its sole coincides with the mark of the layout of the soil, or low, buried in the ground, the latter for anti-vandal execution of the foundation.

The grillage contains holes in which the shanks of the trunks of 3 screw piles are placed, on the supporting washers 8 of which the grillage 1 (2) rests. The number of holes indicated

corresponds to the number of screw piles. The holes for the piles are arranged uniformly around the circumference relative to the axis of the support strut 17. In the upper part of the shaft of the pile 3 there is a transverse hole with a means for screwing and unscrewing the piles installed in it, consisting of an end head 10 with a transversely mounted finger 11. The torsion moment is transmitted through the figured hole the face head, made, for example, in the form of a square socket □ S on the transverse pin d and, further, on the shaft of the screw pile 3. On the shaft 3 of the pile is fixed, for example by welding, a support washer 8 s tverstiyami 9. The lower part comprises a tapered tip of the pile 4 and a helical blade 5. The blade 5 has a diameter varying from maximum to minimum and back to a minimum diameter in the direction from the tip to the stem of the pile, which facilitates the screwing and unscrewing of the pile. The pile is made of metal, with an anti-corrosion and / or plastic coating, or is made of glass or basalt plastic. Each screw pile has a collapsible means of attachment to the grillage, consisting of a plug 14 and a bolt connection 12 with a support washer 8. When tightening the bolt connection 12, the grill 1 (2) is clamped between the elements 8 and 14 and a rigid connection of the grill with the screw piles is formed.

Depending on the type of connection of the grillage 1 (2) with the lower part of the support strut 17 on the grillage, various mating connecting surfaces are made. For a variant of a conical or cylindrical connection with a support support, a conical 18 or cylindrical hole is made in the grill 1. The means for attaching the grillage to the lower part of the support strut is performed in the form of rods 15 fixed to the thrust bearing 16.

For the flange connection option, the grill with the support strut use the grill plane and the fastening means in the form of a bolted connection.

Installation of the foundation is as follows. Mark out the installation sites of the rack and screw piles. Using a manual motor drill, for example, IRON MOLE BT 15-450 drill wells with a diameter under the screw blade of the pile to a depth not less than the depth of freezing of the soil. Piles are lowered into the ground and a device is installed on their trunks - a rigid removable collapsible template (not shown in Fig.) That determines the correct location of the axes of the piles. Screw piles are screwed into pre-prepared wells manually or using a motor drill. A central well is drilled for installing a recessed part of the support strut with a diameter D exceeding the diametrical size of the thrust bearing 16. A sleeve of a release film 19 with low adhesion to frozen ground, for example, polyethylene or polypropylene, is placed in the central well. Install a thrust bearing 16 with rods 15 in the well without damaging the film 19. On the thrust bearing 16 install the lower part of the support strut 17. The cavity between the walls of the central well of diameter D and the film 19 is poured with soil. At the same time, the cavity between the film 19 and the lower part of the support strut is filled 17 filler 20 - soil-cement mixture. Seal the soil and the filler 20. Simultaneous filling of the cavities is carried out in such a way as to ensure the position of the film 19 in the soil in the form of a conical glass with dimensions in the cross section decreasing towards the level of the tips 4 piles. The conical shape of the film 19 even with a small angle (1 ° -3 °) facilitates the removal of the support strut 17 from the ground during dismantling

foundation due to the sliding of the filler 20 on the inner surface of the film or filler together with the film relative to a stationary soil. Install 2 parts of the grillage on the protruding ends of the trunks of 3 screw piles all the way into the supporting washers 8. If necessary, ensure the correct position of the support strut by manually twisting the screw piles through the open end head 10. Assemble the grillage 1 of parts 2 around the strut 17, pass the ears of the rods 15 through fastening means 13 and finally tighten the latter. Install caps 14 on the grillage and tighten them with washers 8 using bolt-on fasteners 12. Remove the collapsible template. In the anti-vandal version, the fastening means 12 and 13 are installed and tightened using anaerobic sealants, for example Loctite.

The removal of the foundation for its reuse is as follows. In the case of a low or increased grillage, remove the soil layer and gain access to the fastening means 12 and 13 and remove them. When dismantling the foundation in anti-vandal design, the fastening means 12 and 13 are usually cut off. Remove the plugs 14 and, manually or with the help of a motor drill, turn the screw piles in sequence, not allowing a strong inclination of the support. In this case, the supports together with the grillage 1 (2) rise up. The use of the release film 19 facilitates the lifting process. Disassemble the grillage in part 2. Release the lower part of the pillar of the support 17 from the remnants of the filler 20. Then the support and foundation elements are transferred to a new installation location.

Reuse of the foundation is carried out similarly to its initial installation.

Claims (2)

1. The foundation is reusable under the composite support of the power line, installed in the ground, containing a grillage with a mount for the support pillar, combining the upper parts of at least two screw piles, each screw pile includes a cylindrical barrel with means for screwing and unscrewing the piles, supporting a washer and a tip with a screw blade, characterized in that the central part of the grillage has a through hole, the surface of which is mated to the lower part of the support strut, under the lower end of the cat A thrust bearing is mounted rigidly connected with rods to the grillage, and each screw pile contains a collapsible means of fastening to the grillage, the screw blade of the pile is made with a varying diameter from minimum to maximum and again to the minimum diameter in the direction from the tip to the pile shaft. 2. The reusable foundation according to claim 1, characterized in that the grillage is made integral and includes means for fastening the grillage parts to each other.

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