RU160887U1 - MAST POSITION WITH COMBINED HOSES - Google Patents

Abstract

A mast structure containing a vertical trunk installed on the foundation and combined guy wires in an amount of at least three pieces located radially in plan at equal angular distances to each other, including guy belts, the upper end of each of which is fixed to the trunk in its upper part, and the lower to its own anchor foundation through a tensioning device that allows you to adjust the position of the barrel and the tensile forces of the elements of combined guy wires connected to the barrel by flexible bands, characterized by that in the plane of each combined guy there is only one guy belt having a polyline outline with kink points belonging to the parabola, and the cords connecting the kink points of the girdle belts with the barrel at points intermediate in its height are arranged in a triangular pattern, forming a system of multi-inclined stretched flexible rectilinear elements of different lengths.

Description

The utility model relates to the field of construction, namely to high-rise structures such as masts with guy wires used to place antennas of radio or television equipment and communications, as well as the type of chimney or ventilation industrial pipes.

The most common straight braces holding the trunk from three, four or more sides and attached to the trunk on one or more tiers [1].

The disadvantage of such schemes is the large length and, as a consequence, the sagging guy wires, as well as the variability of the longitudinal compressive forces in the barrel: from the smallest in its upper part to the largest in the lower.

A known mast design, including the trunk, guy wires and rigid horizontal yards, fixed in tiers on the trunk and connected by free ends with guy wires, in order to reduce their sag [2].

The disadvantage of this scheme is the additional load on the guy rods and the barrel from the weight of the rails, which leads to an increase in the material consumption of the entire structure.

A structure having a mast close to the problem being solved and the result achieved is a mast having a trunk, braces and rigid horizontal braces fixed in tiers on the trunk and connected by free ends to the nearest braces, while remote braces are connected in series with the free ends of each brace by rods breaking breaks into separate spans [3].

A disadvantage of the known design is the presence of massive rails that increase the mass of the entire structure, as well as the difficulty of creating design values for the preliminary tension of all guy wires, ensuring their non-switching off under appropriate wind and temperature influences. Also, such a multiply connected circuit leads to the complexity of regulating the forces in its elements both at the erection stage and during operation to ensure verticality and straightness of the barrel.

The objective of the proposed utility model is to increase the efficiency of mast structures and obtain a higher level of technical result.

The technical result consists in

- reducing material consumption;

- increasing the degree of unification of the elements of the barrel;

- reduction of sagging guy wires;

- reducing the complexity (simplification) of the regulation of efforts in guy rods to ensure their non-disconnectability, as well as the verticality and straightness of the barrel, both at the construction stage and during operation.

The overall technical result is to increase the rigidity and load-bearing capacity of the entire system, i.e. mast constructions.

The technical result is achieved by the fact that

- in the plane of the strands of each combined guy, there is only one pull belt connected directly to the barrel by flexible strands, located in a triangular pattern;

- the towing belts of the mast structure are equipped with tensioning devices that allow you to adjust the position of the barrel and the tension forces of the elements of the combined guy ropes;

- each pull-out belt, the outline of which is a broken line with break points belonging to a second-order curve (for example, a parabola), is fastened with its upper end to the trunk in its upper part, and its lower end to its own anchor foundation through a tensioner.

The utility model is illustrated by drawings, which do not cover and do not limit the entire scope of the claims of this technical solution, but are only illustrative materials of a particular case of execution:

In FIG. 1 shows a general view of a mast structure with three combined guy wires and a triangular arrangement of cords.

In FIG. 2 is a cross section 1-1 in FIG. one.

In FIG. 3 shows a general view of a mast structure with four combined guy wires.

In FIG. 4 is a transverse section 2-2 in FIG. 3.

The combined braces holding the vertical barrel 5 should be at least three, and they should be located radially relative to the barrel with a constant angular pitch.

Each combined guy holding the vertical shaft 5 of the mast structure consists of a flexible cable belt 1, the outline of which is a broken line, and flexible cords 2, which connect the cable belt at break points with the vertical shaft in tiers. The upper end of the pull belt is fixed directly to the barrel 5 in its upper part, and the lower end to the anchor foundation 3 through the tension device 4. The break points of the pull belt 1 belong to a curved line of the second order, for example a parabola. Flexible cords 2 are attached to the barrel 5 and the pull belt 1 with constant or variable vertical pitch and are placed in a triangular pattern. The vertical shaft 5 of the mast structure is supported by its own foundation 6 and can be either continuous or through.

The proposed design of combined guy rods can be used not only in the design of mast structures, but also to increase the bearing capacity of existing vertical load-bearing structures of communication systems, as well as to strengthen chimney trunks.

After mounting the mast structure in the pull-out belts 1 with the help of the tensioning devices 4, tensile forces are created, causing stretching of the flexible strands 2 and compressive force in the vertical shaft 5, constant along its entire length.

Fastening on a vertical trunk 5 flexible strands 2 with a fairly frequent step, selected depending on the size of the structure and wind loads, provides:

- the joint work of the vertical barrel 5 with lanyards 1 and flexible cords 2;

- limitation of the kinematic movements of the pull-out belts 1 both in horizontal and in vertical directions;

- the stability of the vertical barrel 5 in the areas between the points of attachment of the flexible cords 2;

- increasing the overall rigidity of the entire system.

The proposed utility model works as follows.

With the horizontal impact of the wind load on the vertical trunk 5, the tensile forces in the pull-out belt 1 and flexible strands 2 from the windward side increase, which creates the application of lateral forces opposite to the wind to the trunk and ensures the stability of the structure.

After creating pretensiones 1 in the pull belts equal to the forces from the wind, during operation, the stretched sections of the pull belt 1 between the break points and flexible strands 2 from the windward side receive additional tension, and from the leeward side they are unloaded, that is, being previously stretched, work on compression. In this case, the vertical barrel 5 does not experience additional compressive force and only perceives bending moments, which are extinguished by a system of flexible cords 2 fixed to it with a fairly frequent pitch and connected to the tension belts 1.

The proposed design of the mast structure in comparison with the known solutions allows you to:

- eliminate sagging straight sections due to their insignificant length, which significantly increases stability;

- to simplify the inclusion in the work of tension belts and flexible cords in comparison with multi-tiered schemes of straight braces;

- increase the rigidity of the mast structure, including during vibrations;

- reduce the built-up area and increase architectural expressiveness.

INFORMATION SOURCES

1. Sokolov A.G. Metal structures of antenna devices. - M.: Stroyizdat, 1971, p. 20, Fig. 22.

2. Metal structures. In 3 t. T. 3. Steel structures, structures of aluminum alloys. Reconstruction, inspection, strengthening and testing of structures of buildings and structures. (Designer Handbook) / Under the general. ed. V.V. Kuznetsov (TsNIIproektstalkonstruktsiya im.N.P. Melnikova) - M.: Publishing House ASV, 1999, pp. 25-26, Fig. 1.19.

3. Copyright certificate SU 937692 A, E04H 12/08. Mast. / N.P. Melnikov, E.P. Morozov, O.N. Scratch; Applicant Central Research and Design Institute of Structural Metalwork TsNIIproektstalkonstruktsiya, No. 3000208 / 29-33; declared 04.11.80, publ. 06/28/82.

Claims (1)

A mast structure containing a vertical trunk installed on the foundation and combined guy wires in an amount of at least three pieces located radially in plan at equal angular distances to each other, including guy belts, the upper end of each of which is fixed to the trunk in its upper part, and the lower to its own anchor foundation through a tensioning device that allows you to adjust the position of the barrel and the tension forces of the elements of combined guy wires connected to the barrel by flexible bands, characterized by that in the plane of each combined guy there is only one guy belt having a polyline outline with kink points belonging to the parabola, and the cords connecting the kink points of the girdle belts with the barrel at points intermediate in its height are arranged in a triangular pattern, forming a system of multi-inclined stretched flexible rectilinear elements of different lengths.

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