RU198553U1 - DEVICE FOR DOING CONSTRUCTION ELEMENTS - Google Patents

Abstract

The utility model relates to the field of construction, namely to devices for joining polymer and composite elements, such as pipes, ropes, reinforcing rods with each other and with metal elements, and can be used in the production of building products and structures to connect tensile elements. The technical result, which consists in ensuring the reliability of the connection of abutting elements operating in tension, their alignment, and the simplicity of the design of the device, is achieved due to the fact that the device for joining structural elements is made in the form of an elongated braided stocking, symmetrical relative to the middle, with variable weaving density, in which the number and / or diameter of the wires increases from the ends to the middle. To increase the tensile and bending strength at the place of maximum tensile force in the joint, the joint device is additionally reinforced with metal or composite rods or strips, which are inserted into the stocking along the perimeter along the abutting elements. The ends of the stocking are fixed with a belt. The tensile strength of the stocking without reinforcing rods is at least 1.5 times the design force at the joint, and with reinforcing elements - at least 0.8 times the design force at the joint.

Description

The utility model relates to the field of construction, namely to devices for joining polymer and composite elements, such as pipes, ropes, reinforcing rods with each other and with metal elements, and can be used in the production of building products and structures to connect tensile elements.

A device is known for joining composite reinforcement by soldering with sulfur-containing solder (RF patent No. 126349, IPC E04C 5/16, publ. 03/27/2013, bull. No. 9). The ends of the abutting pieces of reinforcement are placed in an extended metal tray, filled with a melt of technical sulfur, which solders the surface of the reinforcement and the inner walls of the tray. The tensile strength of the tray determines the bond strength. The disadvantage of this method is the complexity of its implementation. Sulfur melt is a fairly toxic material, flammable and explosive. Working with him in a production environment is difficult.

Known and widely used in industry are transit (connecting) cable stockings for the temporary connection of electrical cables (LLC "Askonta", https://chulok-kabelny.rf). The stocking is a sleeve open on both sides, woven from a metal wire in such a way that when stretched longitudinally, the sleeve decreases in cross section. Connected cables are inserted from both sides of the stocking and fixed. When the stocking is pulled with a longitudinal force, the flexible wire mesh is tightly pressed against the side surface of the cable sheath and prevents slipping.

The disadvantage of the stocking, adopted as a prototype, is the low tensile strength, and, as a consequence, the impossibility of using reinforcement with a diameter of more than 6-8 mm for joining, and a simple increase in the weaving density of the entire stocking leads to a decrease in its flexibility and, accordingly, the quality of adhesion with abutting elements.

The technical result consists in ensuring the reliability of the connection of abutting tensile elements, their alignment, as well as the simplicity of the design of the device for joining structural elements.

The technical result is achieved by the fact that in the proposed technical solution, the device for joining structural elements is made in the form of an elongated braided stocking, symmetrical about the middle, with a variable density of weaving, in which the number and / or diameter of the wires increase from the ends to the middle. To increase the tensile and bending strength at the place of maximum tensile force in the joint, the joint device is additionally reinforced with metal or composite rods or strips, which are inserted into the stocking along the perimeter along the abutting elements. The ends of the stocking are fixed with a belt.

The essence of the utility model is illustrated by drawings, where Fig. 1 shows a side view of a butt joint of two reinforcement elements, FIG. 2 is a section along a-a of Fig. 1.

The device for joining structural elements consists of a braided flexible mesh stocking 1, stretchable in the longitudinal direction by reducing the transverse size. The stocking 1 is made of metal or composite wires 3 intertwined at an angle of 30-60 degrees to the longitudinal axis of the stocking. Wire 3 stockings 1 are made of flexible and resilient grades of steel or composite material. In order to ensure a tight fit of the stocking to the lateral surface of the ends of the connected elements 2, the stockings are made symmetrical relative to the middle with an increasing density of weaving from the ends to the middle, the tensile strength of which is at least 1.5 times the force at the joint. The end sections of the stocking (in Fig. 1 - L1) are made of a low-density mesh. The next sections (L2 and L3) are made of a tighter weave based on the required tensile strength.

If the required tensile strength of the stocking 1 is insufficient to absorb the design force, the butt device is additionally reinforced with metal or composite rods 4 or strips, which are placed inside the stocking along the side surface of the abutting elements 2 at the place of the greatest tensile forces. In any case, the strength of the stocking without reinforcing rods 4 must be at least 1.5 times the design force at the joint, and with reinforcing elements 4 - at least 0.8 times the force at the joint.

The length of each section is taken depending on the size of the cross-section of the abutting element and the coefficient of friction of the woven mesh of the stocking 1 and the material of the abutting rod 2 and is determined experimentally. To reduce the length of the stocking to the required size and increase the adhesion, the surface of the abutting elements should not be very smooth and should be cleaned of rust, grease, etc.

The device works as follows. The braided stocking 1 from one end is compressed in the longitudinal direction, the end of one of the abutting elements 2 is brought inward to the middle of the stocking and at the same time, at least the entire length of the stocking, additional metal or composite rods or strips 4 are inserted inside, placing them along the lateral surface of the abutting element 2; stretch the stocking 1 to reduce its diameter and tightly compress element 2 and additional rods or strips 4 and fix the stress state of the stocking with an inventory mounting belt 5. Then, from the opposite end, into the stocking 1 with additional rods or strips 4 a second abutting element 2 is brought, stretched stocking and fix it with a belt. If the tensile strength of the stocking is sufficient, then additional rods or strips are not necessary, and in this case, elements 2 are joined only with the help of stocking 1.

If, according to the working conditions in the structure, it is required to have a joint of equal strength for tensile and compressive loads, the stocking is pre-stressed with a special tightening device in order to eliminate the gap between the ends of the abutting elements. To do this, the stocking is pulled onto the butted element inserted into it.

Example No. 1 of the implementation of a butt joint by the proposed device.

It is required to dock steel reinforcement D = 8 mm and a composite polymer rod D = 10 mm. A stocking is selected with sufficient strength at the joint. The end of the steel reinforcement is inserted into an open stocking D = (8-10) mm, compressed and expanded to an acceptable width, to its middle, then stretched and fixed in a taut position with a belt. Then, from the opposite end of the stocking, a composite rod is introduced in a similar way and fixed with a second strap.

The field of application of the butt device is the connection of non-weldable and difficult-to-weld materials, for example: two ends of composite reinforcement, steel reinforcement, steel ropes, polymer rods, wooden posts, pipes, bundles of metal and polymer composite wires, elements of arbitrary cross-section, square, rectangular, triangular and others, connection of elements made of dissimilar materials, including non-weldable, brittle, different sections, for example, round and square, etc., quick-release connections. The peculiarity of the joint device is that it allows you to reliably and quickly connect tensile elements.

Claims (2)

1. A device for joining structural elements, including a braided wire mesh flexible stocking made with the possibility of lengthening and decreasing in cross section, characterized in that the device additionally contains intermediate reinforcing metal or composite rods or strips placed along the perimeter along the abutting elements, when In this case, the stocking is made symmetrical with respect to the middle and has a weaving density increasing from the ends to the middle, the tensile strength of which is at least 0.8 times the force at the joint, and the ends of the stocking have a fixing belt. 2. A device according to claim 1, characterized in that the stocking is made of wires of various diameters.

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