RU2723785C1 - Device for creation of tension force in straps from round steel - Google Patents

Abstract

FIELD: construction.SUBSTANCE: invention relates to construction and can be used to increase bearing capacity of stone and reinforced concrete structures or buildings wholly when performing their reinforcement due to reduction and limitation of transverse deformations. Tightening is performed by transverse tightening of parallel-tightening rods fixed on steel supports along structure perimeter. Rods are tightened by means of device made in form of bent bolt passed into steel tube with welded to it loop from rod, similar to bolt, tightened and fixed in working position due to screwing of nut and lock nut located on straight section of bolt and resting against support end of washer tube end.EFFECT: technical result is improved operational reliability of the structure.1 cl, 4 dwg

Description

The invention relates to the field of construction and can be used to increase the bearing capacity of stone and reinforced concrete structures or entire buildings when performing their reinforcement due to compression and limiting lateral deformations.

Known device "squeeze" (Malganov A.I., Plevkov BC, Polishchuk A.I. "Restoration and strengthening of building structures, emergency and reconstructed buildings" - Tomsk: Tomsk Interindustry Central Scientific Research Institute, 1990 - S. 188, 191) for tightening clamps, in which the rods are passed between the U-shaped loop with a thread at both ends, the rods are pulled together and fixed by two nuts and two locknuts by pressing them with a steel plate with holes through which the ends of the U-shaped loop are passed.

The disadvantage of this device is the time-consuming process of controlling the tension force due to the simultaneous tightening of two nuts and locknuts by the required amount of tightening. This device looks bulky due to the structurally necessary protruding edges of the plate protruding beyond the tightening nuts.

Known tightening device (Malganov A.I., Plevkov BC, Polishchuk A.I. “Restoration and strengthening of building structures, emergency and reconstructed buildings” - Tomsk: Tomsk Interindustry TsNTI, 1990 - S. 188) used in various inventions (RU 2471943 C2, IPC E04G 23/02, published January 10, 2013) in the form of a turnbuckle or a hollow sleeve with an internal thread at both ends, into which steel puffs with pre-cut threads are inserted with their ends, and due to the turn-up of the turnbuckle / sleeve, the ends come closer together puffs, their elongation and, as a consequence, tension.

The disadvantage of this device is the complexity of installation, because in this case, the length of each individual tightening should be predetermined before the start of work, and at its end it is necessary to cut the thread in the factory. The device does not have locknuts that prevent it from unwinding.

There is a method of pairwise tightening of the pivot rods with a manual lever fixture (Malganov A.I., Plevkov BC, Polishchuk A.I. “Restoration and strengthening of building structures, emergency and reconstructed buildings” - Tomsk: Tomsk Interindustry TSNTI, 1990 - S. 191), with their subsequent fixation by setting the studs from reinforcing steel.

The disadvantage of this method is the unreliable control of the magnitude of the set tension force and the unpredictable loss of tension force when the stud is turned on after removing the lever device.

A known method of tensioning rods-puffs by screwing nuts located on steel stops at the ends of the rods, used in various inventions (RU 2525089 C1, IPC, E04G 23/02 publ. 08/10/2014).

The disadvantage of this method is the time-consuming process of manufacturing steel stops and the pins, because in this case, the length of each individual tightening must be predetermined before the start of work, and at its ends it is necessary to cut the thread in the factory.

The present invention is aimed at achieving a technical result, which consists in increasing the reliability of the reinforced structure, in reducing the metal consumption, laboriousness, increasing the versatility of the methods for tensioning steel puffs when reinforcing building structures by creating comprehensive compression, as well as improving the accuracy of controlling the magnitude of the force in the pull-together rods .

To achieve this technical result, the tightening of the steel tie rods is created by a device made in the form of a bent bolt, inserted into a steel tube with a loop pre-welded to it from a rod similar to a bolt, tightened and fixed in working position by tightening the nuts and lock nuts located on a straight section of the bolt and resting against the end of the tube through the support washer. In addition, the diameters of the bolt, hinge, tube, nuts and puffs themselves can vary depending on the required magnitude of the created compression force.

Distinctive features of the device for creating a pulling force in steel rods-puffs are the presence of a steel tube with a loop welded to it and an extremely simple way of tensioning and fixing in the working position by screwing the nuts and locknuts located on the straight section of the bolt and resting against the end plate through the support washer tube.

Welding the tightening loop to the steel tube ensures reliable fixation of the tightened rods and completely eliminates the rotation of the device in the working position. The ease of installation and manufacture of the device reduces the complexity of the work when strengthening building structures by the method of comprehensive compression.

Due to the presence of these signs, conditions are created to accelerate and simplify the installation of amplification elements, because assembly speed and ease of tensioning steel puffs increases significantly, and steel consumption drops significantly. In addition, the device has a simple design, not massive, does not spoil the appearance of the reinforced structures, meets the requirements of current standards and, if necessary, is easily dismantled.

The invention is illustrated by drawings, which depict:

In Fig.1 - a device for creating a tensile force in steel puffs;

figure 2 is a diagram of the reinforcement of a stone or reinforced concrete structure of a small cross section by mounting steel puffs and creating a compression force by them;

figure 3 is a diagram of the reinforcement of a large building structure or building by installing steel puffs and creating a compression force by them;

figure 4 is a section aa of figure 2, 3.

The device (Fig.1, 2, 3, 4) for creating tension forces 12 in steel rods-puffs 10 includes a bent bolt 1 with thread 2 in a straight section, a steel tube 3 with a loop 4 for welding 8, a supporting washer 5, a clamping nut 6 and lock nut 7. Steel tie rods 10 are located between the loop 4 and the bent part of the bolt 1. When tightening the clamping nut 6, the loop 4 and the bend of the bolt 1 come together, tightening the steel tightening 10, due to which tension forces 12 arise in them. Lock nut 7 serves to fix the clamping nut 6 after creating the required tension force 12 in the steel puffs 10.

The creation of compression 13 in the reinforced structure 9, or in the entire building, is as follows.

On the reinforced structural element 9, steel stops 11 are mounted with two braces of steel brackets parallel to each other mounted on them 10. A device for creating a tension force is installed so that the steel braces 10 are between the loop 4 and the bent part of the bolt 1. When tightening the clamping nut 6, the loop 4 and the bend of the bolt 1 come together, pulling together and simultaneously stretching the steel puffs 10, due to which tension forces 12 arise in them. Tension forces 12 are transmitted through the steel stops 11 to the reinforced stone or reinforced concrete structure 9, thereby increasing its load-bearing structure ability due to the compression force 13 and the limitation of transverse deformations. After creating the necessary tension force 12 in the steel puffs 10, the position of the clamping nut 6 is fixed by a lock nut 7, which prevents its unwinding. The force of the transverse retraction of the rods by the device is determined by the moment of tightening the nut 6, and the tension force 12 of the rods 10 is calculated according to Hooke's law through the relative deformations and the elastic modulus of the steel.

The simplicity of the device and the availability of installation provide quick and accurate implementation of the action to create compression 13 in the reinforced building structure 9.

The bolt 1, loop 4 and tube 3 may have different diameters and lengths. Their choice is determined by calculation depending on the required tension force 12, the diameter and the distance between the steel puffs 10. The use of a steel tube 3 eliminates the rotation of the device in the mounting position and increases the reliability of the tension. For the manufacture of a tension device in the factory or on the construction site, scraps (waste) of both reinforcing and rolled steel, as well as scraps (waste) of steel pipe can be used, which reduces the complexity and metal consumption of the product elements. The cutting and welding of parallel rows of steel puffs 10 on the stops 11 is easily carried out locally in construction conditions.

This proposed solution is universal and suitable for all types of stone and reinforced concrete structures, when they need to be strengthened by comprehensive compression using steel puffs.

Thus, the proposed device for creating a tensile force in steel puffs allows to increase the reliability of steel reinforcing elements, reduce their metal consumption and labor intensity and is a universal solution regardless of the type of construction and the number of puffs used.

Claims (2)

1. Device for creating tension in steel rods-puffs, when reinforcing the structure by compression method, characterized in that the contraction of the rods is created by a device made in the form of a bent bolt, inserted into a steel tube with a loop from a rod pre-welded to it, similar to a bolt tightened and fixed in the working position by screwing the nuts and locknuts located on the straight section of the bolt and abutting through the support washer to the end of the tube. 2. The device according to p. 1, characterized in that the tightening device is put on parallel steel rods-puffs after their installation.

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