RU2763426C1 - Fire-resistant casing for metal threaded stud - Google Patents

Abstract

FIELD: fire protection systems.

SUBSTANCE: proposed technical solution relates to fire protection systems and is intended for fire protection of cable facilities, including at nuclear power plants and thermal power plants, increasing the fire resistance limit of load-bearing metal structures, increasing the fire resistance limit of ventilation ducts, including at nuclear power plants and thermal power plants, finishing fire-resistant structures of industrial and construction facilities, including at nuclear power plants and thermal power plants. The invention concerns a mineral-cotton fire-resistant casing for a metal threaded stud, containing two parts connected to each other by means of a fire-resistant sealant, each of which has a coaxial cutout for the said stud for its placement in the casing when the parts of the casing are closed, and also concerns the supporting structure of the cable box, which is a suspension in the form of a metal threaded stud, equipped with the described mineral-cotton fire-resistant casing.

EFFECT: simplification of the installation process of the elements of the fire protection system of cable or cable lines, as a result, an increase in the speed of installation of the elements of the fire protection system of cable lines, as a result, a reduction in the duration of installation of the elements of the fire protection system of cable lines; as well as an increase in the fire protection of the cable economy as a whole.

9 cl, 5 dwg, 2 tbl

Description

[0001] TECHNICAL FIELD

[0002] The proposed technical solution relates to fire protection systems and is intended, for example, for fire protection of cable facilities, including at nuclear power plants and thermal power plants, increasing the fire resistance of load-bearing metal structures, increasing the fire resistance of ventilation ducts, including at nuclear power plants and thermal power plants, finishing fire-resistant structures of industrial and construction facilities, including nuclear power plants and thermal power plants.

[0003] BACKGROUND OF THE INVENTION

[0004] A fire protection system is known, known from technological regulations No. 28/5765 for the installation of a fire-resistant cable box "OgneVent-K", available online: http://www.croz.ru/upload/iblock/38f/38fc627bf9aae3d4014d575e36310cf6.PDF (D1 ). The fire protection system known from D1 has a long and complicated installation, does not provide sufficient fire protection at the joints and joints of elements, mainly due to loose joints and the difficulty of correctly placing the elements of the system relative to each other during installation, and also does not allow for quick dismantling any section of the box if it is necessary to carry out repair work on the cable line, which is mainly manifested in the fact that in order to access the cable facilities, it is necessary to dismantle the supporting wall of the fireproof box, which leads to a general decrease in structural rigidity and leads to the need to dismantle the remaining parts of the box, except bottom, which, accordingly, upon completion of repair work on the cable line leads to the need to re-assemble the section, or even several sections, which significantly reduces the overall speed of the repair work and, accordingly, increases their total duration, which is critical, per hour ness, in the operating conditions of nuclear power plants and thermal power plants.

[0005] SUMMARY

[0006] The technical problem solved by the claimed technical solution is the creation of a fire protection system for cable or cable lines and its load-bearing structures - studs and channels - as well as the creation of individual elements of this system that provide simple and quick installation, increased fire protection of cable facilities, operational reliability, as well as the ability to quickly dismantle the elements to ensure repair work on the cable line without the need to destroy the fire protection system. Another technical problem solved by the claimed technical solution is the expansion of the arsenal of technical means for a specific purpose, namely, fire protection systems for cable lines and their individual elements.

[0007] The technical result achieved when implementing the claimed technical solution, in addition to realizing its purpose, is to simplify the installation process of the elements of the fire protection system for cable or cable lines, as a result - an increase in the speed of installation of elements of the fire protection system for cable lines, as a result - a decrease in the duration of installation of elements fire protection systems for cable lines; as well as an increase in the fire safety of the cable industry as a whole, and, as a result, an increase in the operational reliability of the cable industry; as well as the simplification of the dismantling of the elements of the fire protection system of cable lines, as a result, the acceleration of the dismantling of the elements of the fire protection system of cable lines, as a result, the reduction in the duration of installation of the elements of the fire protection system of cable lines, as a result, the increase in the maintainability of the cable industry as a whole.

[0008] The technical result is achieved due to the fact that a mineral wool fire-retardant casing is provided for a metal threaded stud, containing two parts interconnected by means of a fire-resistant sealant, each containing a coaxial cutout for the said stud for its placement in the casing when the casing parts are closed.

[0009] BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Exemplary embodiments of the present invention are described in detail below with reference to the accompanying drawings, which are incorporated herein by reference, and in which:

[0011] In FIG. 1 shows an exemplary embodiment of the claimed cable fire protection system.

[0012] FIG. 2 and 3 show an exemplary other embodiment of the claimed cable fire protection system.

[0013] FIG. 4 is a sectional view of an exemplary channel in a fire protection casing used in the claimed fire protection system.

[0014] FIG. 5 shows a sectional view of an exemplary flame retardant stud used in the claimed fire protection system.

[0015] CARRYING OUT THE INVENTION

[0016] The following are embodiments of the present technical solution, revealing examples of its implementation in private versions. However, the description itself is not intended to limit the scope of the rights granted by this patent. Rather, it should be assumed that the claimed technical solution can also be implemented in other ways in such a way that it will include different elements and conditions or combinations of elements and conditions similar to the elements and conditions described herein, in combination with other existing and future technologies.

[0017] In one of the embodiments (FIGS. 1, 2, 3), a cable fire protection system 100 is provided, comprising a cable box mounted on the surface of a building structure or on suspensions, around which a fire protection box 1010 is formed, formed by rigid non-combustible plates 1011, equipped with perforated corners 1012, through which the box is assembled into a single structure. The box 1010, in this case, the box may contain a self-closing ventilation unit (not shown in the drawings), which is a ventilation channel with gratings on each side of the channel, the space between which, at least partially, is filled with an element that increases in volume when exposed to heat, containing an opening for passing air flows through it. The aforementioned box 1010 at the same time contains a system of suspensions in the form of metal threaded studs 1013 (Fig. 5), transversely to the box 1010 connected by metal channels 1014 (Fig. 4) for placing a cable duct 200 on them, and the mentioned studs 1013 are equipped with fire-retardant mineral wool casings 1015, consisting of two parts, each containing a coaxial cutout for the pin 1013 for its placement in the casing when the casing parts are closed; moreover, at least partially, the channels 1014 are provided with mineral wool casings 1015, consisting of two parts, one of which contains a cutout for the channel for its placement in the casing 1015, and the second part contains a protrusion under the channel base for its placement in the channel base when closing parts, which provides a more reliable connection of the parts of such a casing 1015 to each other, and, consequently, increased fire safety of the supporting structures of the cable or cable line fire protection system and, as a result, increased operational reliability of the cable fire protection system as a whole; and/or said perforated box corners 1012 serve as attachment means to the building structure. Preferably, but not limited to, rigid non-combustible slabs 1011 are made of stone wool, for example, but not limited to, cut to the desired size from a heat-insulating board with a density of at least 150 kg/m ³ , for example, not limited to basalt heat-insulating board, for example, not limited to plates IZOVOL KV-150 (Russia). Preferably, but not limited to, a rigid non-combustible board is selected as a blank, not containing any surface coating to maintain good adhesion of its surfaces for easy and convenient coating with a fire retardant composition, for example, but not limited to, a cold curing fire retardant intumescent composition. Preferably, but not limited to, finished rigid non-combustible boards 1011, perforated corners 1012, as well as other exposed surfaces, including metal, are coated at least in part with a cold-cured fire retardant intumescent composition, such as, for example, but not limited to, fire retardant intumescent composition of cold curing, described in the patent of the Russian Federation No. 2492201, the materials of which are thus included in the present description by reference. At the same time, it should be obvious to a person of ordinary skill in the art, for whom this technical solution is designed, that instead of the above cold curing fire retardant composition, any suitable cold curing fire retardant composition, as well as any suitable other curing fire retardant composition, can be used, for example, without limitation, ultraviolet curing, if such replacement provides the required fire resistance limits of the cable duct and other elements of the claimed fire protection system. Preferably, but not limited to, the fire jacket 1015 for the channel 1014 may include a cutout for the channel 1014 in one part and a counter ledge in the other part for placement in the base of the channel 1014, as shown in FIG. 4, which provides a more reliable connection of the parts of such a casing 1015 to each other, and, consequently, increased fire safety of the supporting structures of the cable or cable line fire protection system and, as a result, increased operational reliability of the cable fire protection system as a whole. Preferably, but not limited to, the flame retardant casing 1015 for the threaded stud 1013 may include a stud cutout 1013 and guide cutouts in one part, and a similar cutout for the stud 1013 and mating guides for the guide cutouts in another part, as shown in FIG. 5, which provides a more reliable connection of the parts of such a casing 1015 to each other, and, consequently, increased fire safety of the supporting structures of the cable or cable line fire protection system and, as a result, increased operational reliability of the cable fire protection system as a whole. Preferably, but not limited to, the seams 1016 adjoining the elements of the box 1010 to each other, to the surfaces of building structures, to the casings 1015, the abutment seams (gluings) 1016 of the casings 1015 are sealed with a fire-resistant sealant, such as, for example, but not limited to, a surface curing fire-retardant sealant INZAGERM HPS (Russia). Preferably, but not limited to, the vent unit is glued and sealed at the abutment seams in the mounting hole in the rigid flame retardant board 1011 with said fire retardant sealant. Preferably, but not limited to, the metal threaded stud 1013 is glued into its fire retardant casing 1015, the metal channel 1014 is glued into its fire retardant casing 1015 using the aforementioned fire retardant sealant. Preferably, but not limited to, the parts of the housings 1015 are glued together using the aforementioned fire resistant sealant. Preferably, but not limited to, the protrusion under the channel base of one of the portions of the channel fire hood is glued into the channel base with the aforementioned fire retardant sealant. Preferably, but not limited to, if the stud casing has said cutout guides and corresponding cutouts, then such abutments are also sealed with the aforementioned fire retardant sealant. Preferably, but not limited to, the outer sides of the housings 1015 are also coated with the aforementioned cold set fire retardant intumescent composition. Preferably, but not limited to, the application thickness of said cold curing fire retardant intumescent composition, the overall diameter of the casing 1015 of the stud 1013, or the casing 1015 of the channel 1014, as well as the thickness of the application of the mentioned fire-resistant sealant for gluing parts of the casing 1015, gluing the stud 1013, channel 1014 into the casing 1015 provide bearing capacity limits in accordance with table 1:

[0018] Preferably, without limitation, the use of the aforementioned cold curing fire retardant composition and the aforementioned fire retardant sealant as part of the claimed fire protection system provides increased fire resistance of the claimed cable system as a whole, and in some cases may be necessary for the fire retardant system to implement its purpose, since in under certain conditions, for example, without limitation, when the claimed fire protection system is intended for use in the protection of cable facilities at nuclear power plants and thermal power plants, it is required to provide increased fire resistance and bearing capacity limits, which may not be provided in the absence of fire-resistant coatings on metal elements and rigid non-combustible plates of the system fire protection.

[0019] By way of example, and not limitation, the aforementioned perforated corners 1012 are selected to provide quick attachment to the building structure 300 as well as quick bonding of rigid non-combustible boards 1011 as shown in FIG. 1 and FIG. 2. For example, without limitation, the installation of the claimed fire protection system without the use of threaded studs 1013 and channels 1014, as shown in FIG. 1 may be accomplished by attaching starter perforated corners that are secured to the building structure 300 in such a way as to place the pre-assembled conduit 200 within the fire conduit 1010 and allow rigid fire retardant boards 1011 of the conduit 1010 to be attached thereto; attaching to them horizontal rigid non-combustible plates 1011; fixing on the ends of the horizontal rigid non-combustible plates 1011 the following perforated corners 1012; fixing on the ends of the vertical rigid non-combustible plates 1011 corresponding perforated corners 1012; and, finally, the connection through the respective perforated corners 1012 horizontal and vertical rigid non-combustible plates 1011 to form a box 1010; and, as seen from FIG. 1, in such a case box 1010 may not include a wall that is placed parallel to the vertical or horizontal surface of the building structure 300, on which the starting perforated corners 1012 are fixed, however, a person of ordinary skill in the art, for whom this technical solution is designed, should it will be obvious that in order to increase the operational reliability and degree of fire resistance, as well as the fire resistance limits of the fire box 1010, it can be provided with a corresponding rigid non-combustible plate 1011 parallel to the surface of the building structure 300. For example, without limitation, the installation of the claimed fire protection system using a suspension system (Fig. 2, 3) can be carried out by assembling a fire retardant box 1010 around a cable box 200 pre-mounted on the channels 1014, and in this case, the fire retardant box 1010 is made of at least four walls, about formed with rigid non-combustible boards 1011 fastened with perforated corners 1012, as previously described; while differing from the duct 1010 previously described with reference to FIG. 1 is that the box 1010 is not attached to the surface of the building structure by the perforated corner 1012, but is instead held by the channels 1014; while, as follows from FIG. 2 and 3, the channel 1014 can either protrude outside the box 1010 and then such a channel 1014, preferably, but not limited to, is provided with a fire protection casing 1015, or the channel 1014 can be placed entirely inside the fire protection box 1010, in which case the upper wall of the box 1010 is connected by fire-resistant sealant with a casing 1015 of the threaded stud 1013. In this case, as a rule, the fire-retardant box 1010 does not contain rigid non-combustible plates 1011 at its ends, since the ends, as a rule, are aligned with the surfaces of building structures through which the cable line passes; however, it should be apparent to one of ordinary skill in the art, to whom the present invention is intended, that any end of the fire box 1010 may be covered, if desired, by a suitable rigid, non-combustible plate 1011 secured in the manner previously described. At the same time, said perforated corners 1012, for example, without being limited to, are perforated steel corners with a size of 1.0×50×50 mm with a perforation pitch of 100 mm and perforations of 6×35 mm. At the same time, it should be obvious to a person of ordinary skill in the art, for whom the present technical solution is designed, that depending on the geometric parameters of the rigid non-combustible plate 1011, another perforated corner of other sizes can be selected. At the same time, the connection of the perforated corners 1012 with the surface of the building structure 300, the surfaces of rigid non-combustible plates 1011 can be carried out by methods known from the prior art with means, for example, without being limited to concrete quick-mount bolts, anchor bolts, screws, and the like, which are further detailed are not described.

[0020] Preferably, but not limited to, a self-closing ventilation unit is a ventilation duct with gratings on each side of the duct, the space between which is filled with an element that expands in volume when exposed to heat, containing an opening for air flows through it. Preferably, but not limited to, the ventilation duct is made of metal, such as, but not limited to, steel and/or other suitable material. Preferably, but not limited to, a grille is fixed to each side of the ventilation unit, which is a ventilation grille. Preferably, but not limited to, the grid is made of metal, such as, but not limited to, steel and/or other suitable material. Preferably, but not limited to, the space between the gratings is filled with an expandable element when exposed to heat. Preferably, but not limited to, the heat expandable element is a heat intumescent composition containing the following components in the following ratio, wt. %:

versatic vinyl ester copolymer dispersion acids in water 30-70; graphite oxidized thermoexpandable 10-25; basalt fiber 15-40.

[0021] For example, but not limited to, the expandable element upon exposure to heat is an intumescent composition upon exposure to heat, containing the following components in the following ratio, wt. %:

versatic vinyl ester copolymer dispersion acids in water 55; graphite oxidized thermoexpandable 15; basalt fiber thirty.

[0022] For example, without limitation, the expandable element upon exposure to heat is an intumescent composition upon exposure to heat, containing the following components in the following ratio, wt. %:

versatic vinyl ester copolymer dispersion acids in water 50; graphite oxidized thermoexpandable 25; basalt fiber 25.

[0023] For example, but not limited to, the expandable element upon exposure to heat is an intumescent composition upon exposure to heat, containing the following components in the following ratio, wt. %:

versatic vinyl ester copolymer dispersion acids in water 70; graphite oxidized thermoexpandable 15; basalt fiber 15.

[0024] Preferably, but not limited to, the heat expandable element is produced as follows. Preferably, without limitation, at the first stage, the dispersion of the vinyl ester copolymer of versatic acid in water, oxidized thermally expanding graphite, and basalt fiber are mixed until a wetted mixture is obtained. Preferably, without limitation, at the second stage, the resulting wetted mixture is laid out in the forms and placed in an oven preheated to a temperature in the range from 180 to 220 degrees Celsius. Preferably, as said oven, a microprocessor-controlled drying and polymerization oven known from the prior art is used. Preferably, in the third step, said wetted mixture is kept in said preheated oven until a dried mixture is obtained, while under the dried mixture is the mixture obtained, characterized by a relative humidity of not more than 1%. Preferably, without limitation, the moisture content of the mixture during drying in the oven is controlled according to GOST 14870-77 “Chemical products. Methods for the determination of water "(with Changes N 1, 2), which is thus included in the present description by reference. Preferably, but not limited to, in the last step, the dried mixture is processed mechanically, for example, but not limited to, using a band saw known from the prior art, to obtain an element of the desired shape that expands when exposed to heat. Preferably, but not limited to, the heat expandable element is activated and begins to expand when exposed to heat of at least about 200 degrees Celsius. Preferably, but not limited to, the heat expandable element may be provided with a through hole to allow air flows through when the heat expandable element is placed between said grids. For example, but not limited to, the heat expandable element can be provided with multiple through holes to allow air flow through them when the heat expandable element is placed between said grids. For example, without being limited, the element expanding in volume when exposed to heat can be made in the form of a cylinder with a through longitudinal hole (through longitudinal cavity) that allows air flows to pass through it when the element expanding in volume when exposed to heat is placed between the mentioned gratings. For example, without limitation, the element that increases in volume when exposed to the body can be made in the form of a parallelepiped with a through longitudinal hole (through longitudinal cavity) that allows air flows to pass through it when the element that increases in volume when exposed to heat is placed between the mentioned grids. For example, without limitation, the expandable element under the influence of the body can be made in the form of a sheet with a through hole that allows the passage of air flows through it when the element expands when exposed to heat is placed between the mentioned gratings, and in this case the space between the mentioned gratings is filled a sufficient number of such sheets. For example, without being limited, the element that expands in volume when exposed to heat can be made in the form of a cylinder with several through longitudinal holes (through longitudinal cavities), which ensures the passage of air flows through them when the element that increases in volume when exposed to heat is placed between the mentioned grids. For example, without limitation, the element expanding in volume when exposed to heat can be made in the form of a parallelepiped with several through longitudinal holes (through longitudinal cavities) that ensure the passage of air flows through them when the element increasing in volume when exposed to heat is placed between the mentioned gratings. For example, without being limited, the heat-expanding element can be made in the form of a sheet with several through longitudinal holes that allow air flows to pass through them when the heat-expanding element is placed between said grids, and in this case, the space between the mentioned gratings is filled with a sufficient number of such sheets. For example, without being limited, the element that expands in volume when exposed to heat can be made in the form of a small-sized said cylinder, which itself occupies an insignificant place inside the volume of a self-closing ventilation unit, in which case the space between said gratings is filled with a sufficient number of such cylinders. Preferably, said undersized cylinders are positioned in such a way that their through holes are located predominantly coaxially with the holes of said grid. For example, without limitation, an element that expands in volume when exposed to heat can be made in the form of a low-dimensional parallelepiped, which itself occupies an insignificant place inside the volume of a self-closing ventilation unit, in which case the space between said gratings is filled with a sufficient number of such parallelepipeds. In this case, it is preferable that said low-dimensional parallelepipeds are located in such a way that their through holes are located predominantly coaxially with the holes of the mentioned lattice. Preferably, when the heat-expandable element contains a plurality of holes, such holes, when such an element is placed inside a self-closing ventilation unit, were located predominantly coaxially with the holes of the said grid. For example, but not limited to, the heat expandable element is in the form of a grid with a plurality of holes, which, when such an element is placed inside a self-closing ventilation unit, are located predominantly coaxial with the holes of the said grid. It should be obvious to a person of ordinary skill in the art, for whom the present technical solution is intended, that from the resulting dried mass, an element of any shape suitable for placement inside a self-closing block, allowing the passage of air flow within the self-closing ventilation unit, such as but not limited to polyhedron, prism, pyramid, sphere, and the like. It should also be obvious to a person of ordinary skill in the art, for whom the claimed technical solution is intended, that the choice of the shape of an element that expands when exposed to heat between a parallelepiped (like shape) and a cylinder or ball (like shape) depends on the requirements to the self-closing ventilation unit requirements: for example, without being limited, if the space inside the self-closing ventilation unit is filled with a plurality of parallelepipeds (a plurality of self-sustaining elements of similar shape that increase in volume when exposed to heat, for example, a plurality of polyhedra, prisms, pyramids containing corners), then thus, the throughput of the ventilation unit is reduced in terms of air flows passing through it, but at the same time, the space filled with elements that increase in volume when exposed to heat is increased, that is, the rate of filling the ventilation space is increased refractory material resulting from the activation of the element, since the number of non-activated elements and, accordingly, the composition that swells when exposed to heat inside the ventilation unit is greater; for example, without being limited, if the space inside the self-closing ventilation unit is filled with a plurality of cylinders (a plurality of self-contained elements of a similar shape that increase in volume when exposed to heat, for example, a plurality of balls that do not contain corners), then the throughput of the ventilation unit in part of the air flows passing through it, but at the same time, the space filled with elements increasing in volume when exposed to heat is reduced, that is, the rate of filling the space of the ventilation duct with refractory material resulting from the activation of the element is reduced, since the number of non-activated elements and, accordingly, intumescent when exposed to heat, the compositions inside the ventilation unit are smaller. The self-closing ventilation unit can also be an intermediate link of a longer ventilation duct, and the grille can be oriented at an angle to the main length of the ventilation duct, for example, but not limited to perpendicular. In this case, such an intermediate link preferably contains elements that increase in volume when exposed to heat, which are preferably sheets or lattices or the like, placed between its lattices, i.e. such elements, the openings of which can be placed not only mainly coaxially with the openings of the mentioned lattice, but also coaxially with similar elements located in the main ventilation duct located at an angle, and such an intermediate link can have only one lattice, and the other space of the ventilation duct, not necessarily completely, but sufficiently, can be filled with an element that increases in volume when exposed to heat, moreover, it should be obvious to a person of ordinary skill in the art, for whom the present technical solution is designed, that the amount of the element expanding in volume when exposed to heat should be such as to ensure its sufficient expansion to the boundaries the lower and upper walls of the ventilation duct, as well as the grille. Preferably, a self-closing ventilation unit (including, but not limited to, in the form of an intermediate link of the ventilation duct) is mainly located on the top wall of the fire-resistant cable duct and provides convection heat removal from electrical cables located inside the duct during their operation. It should be obvious to a person of ordinary skill in the art, for whom the present technical solution is intended, that in this case, the placement of the ventilation unit as part of the mentioned fire-resistant cable duct is not necessarily carried out on its upper wall, but can also be carried out on its other walls, which is due to the requirements for a fire-resistant box for heat removal, as well as the way it is placed in the room. In normal operation, the ventilation unit, due to the previously described expanding element with holes, ensures the necessary efficiency of removing excess heat from the fire-resistant cable duct, preventing overheating of the cable and thereby increasing the reliability and durability of its operation. In the event of an emergency situation associated with a fire in any room in which electrical cables are laid protected by fire-resistant boxes with self-closing ventilation units installed, heat begins to act on an element that increases in volume when exposed to heat, which, when the exposure temperature reaches approximately 200 degrees Celsius is activated and begins to increase in volume, filling the space of the self-closing ventilation unit, thus preventing the further passage of air flows from the outside through it and thus stopping the supply of combustion products and elevated temperature into the fire-resistant box. In the event of an emergency situation associated with the ignition of the cable itself, the heat also begins to act on the element that increases in volume when exposed to heat, which, when the exposure temperature reaches approximately 200 degrees Celsius, is activated and begins to increase in volume, filling the space of the self-locking ventilation unit, thus preventing the access of oxygen to the inside of the fire-resistant cable duct and thereby preventing the further development of the fire. At the same time, in both described cases of emergency situations, in contrast to the analogues known from the prior art, the element that increases in volume when exposed to heat remains inside the ventilation unit with an increase in its volume, which is also determined by the composition of the composition from which it is made, since this ensures its characteristics in the activated state, namely, elasticity, hardness and lack of crumbling.

[0025] Preferably, but not limited to, the fire box 1010 still provides the fire resistance limits in accordance with Table 2 at the appropriate rock wool density and wall thickness (the total thickness of said rigid fireproof board 1011 with or without a fire retardant coating applied to it) of the fire box 1010 :

[0026] The present description of the implementation of the claimed technical solution demonstrates only particular embodiments and does not limit other options for implementing the claimed technical solution, since other possible alternative embodiments of the claimed technical solution that do not go beyond the scope of the information set forth in this application should be obvious to a specialist in this field of technology, having the usual qualifications, for which the claimed technical solution is designed.

Claims (11)

1. A mineral-cotton fire-retardant casing for a metal threaded stud, containing two parts interconnected by means of a fire-resistant sealant, each containing an coaxial cutout for the said stud to be placed in the casing when the casing parts are closed. 2. The casing according to claim. 1, characterized in that it is made with the possibility of gluing the said stud into the cutout for the stud using a fire-resistant sealant and parts of the casing of the fire-retardant stud are glued together with a fire-resistant sealant. 3. The casing according to claim. 1, characterized in that one part of the fireproof casing contains cutouts for the guides, and the second part contains the corresponding guides for the cutouts. 4. The casing according to any one of paragraphs. 1-3, characterized in that the seams of the junction (gluing) of the casing are sealed with a fire-resistant sealant. 5. The casing according to claim. 4, characterized in that the outer sides of the casing are covered with a fire-retardant intumescent composition. 6. The casing according to claim 5, characterized in that it provides the limits of the bearing capacity of the stud in accordance with the table: Bearing capacity limit, min General
diameter
stud casing, mm Application thickness of fire-retardant intumescent composition, mm Thickness of application of fire-resistant sealant, mm R120 72 one one R240 104 2 one 7. The casing according to any one of paragraphs. 1-3, characterized in that the outer sides of the casing are covered with a fire-retardant intumescent composition. 8. The casing according to claim 7, characterized in that it provides the limits of the bearing capacity of the stud in accordance with the table: Bearing capacity limit, min General
diameter
stud casing, mm Application thickness of fire-retardant intumescent composition, mm Thickness of application of fire-resistant sealant, mm R120 72 one one R240 104 2 one 9. The supporting structure of the cable box, which is a suspension in the form of a metal threaded stud, equipped with a mineral-cotton fire-retardant casing according to any one of paragraphs. 1-8.

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