RU1784750C - Device for preliminary straining of wire mesh - Google Patents

Abstract

Usage: in prestressed reinforced concrete structures of buildings and structures. SUMMARY OF THE INVENTION 1 tensioning mechanisms are mounted in the corners of the power frame, made in the form of a cylindrical pipe muffled from the end and cut into separate parts along the diametrical plane, filled with a solution of expanding substance, each of the individual parts of the pipe being welded along the outer surface into channel trim pieces, which tightly bent around a selection cable equipped with double-sided hooks for attaching wire mesh. 4 ill.

Description

The invention relates to the field of manufacturing technology for prestressing structures and systems, in particular to devices for tensioning structures from metal wire mesh used in various structures of buildings and structures.

A device is known which includes selection cables fixed to the grid along parabolic curves using double-sided hooks, followed by tensioning the selection cables by force elements and securing the mesh along the frame contour to tension it 1.

A disadvantage of the known device is the impossibility of simultaneously uniformly tensioning the selection cables both in the longitudinal and transverse directions and, in connection with this, of poor-quality manufacturing of mesh systems and the impossibility of independent tensioning of nets without the use of mechanisms (jacks, chain hoists) 7, for example, monolithic construction.

The purpose of the invention is to increase the uniformity of the mesh tension.

Fig. 1 shows a device that implements mesh tension, ttlan; in Fig.2 - node I in Fig.1; in Fig.Z - section aa in Fig.2; figure 4 is a section bB in figure 2.

The mesh panel consists of wire mesh 1 and frame 2.

The mesh 1 is pre-tensioned using a device consisting of a three-axis washer 3, fixed around the perimeter at individual points of the mesh 1, arranged along parabolic curves with hooks 4. On the frame 2, a single cable-selection 3 is fixed on the stops 5 through tensioning devices 6, around which a cable-pick-up 3 is fastened with the help of loop hinges. The ends of the cable-pick 3 are connected to each other by means of presses 7.

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The tension device 6 consists of two cuts. to the shelves of which along their entire length symmetrical segments are welded, cut along the diameter of the pipe 8, the length of which is equal to the length of the channels.

A plug 9 is welded to the end of one of the channels, hermetically overlapping one of the ends welded into the channels of the half-pipe 8 of the sliding cylinder. The sections of the channels combined in the form of a duct with the segments of the half-pipes 8 boiled in them are connected to each other by 1 two points by mounting spot welding.

In assembled form, each tensioner 6 is installed close to the stops 5 and bent around them with a loop loop of the selection cable 3. Before filling the sliding cylinders of each tensioner with a solution of НРС-1, metal rods 10 are installed in them in the middle of the cross-sectional area to reduce the consumption of LDC-1 and intensify the expansion of LDC-1.

The inventive mesh prestressing device operates as follows.

A grid 1 is laid on the frame, in which, in accordance with the marking along parabolic curves, the cable-picking 3 is fixed with hooks, then the cable-picking 3 in the form of splicing loops is put on the tensioning devices 6 located on the stops 5. The free ends of the cable-picking 3 are tensioned and connected to the ring by means of presses 7, Finally, the tension of the selection cable 3 on the stops 5 is carried out with the help of tension devices 6, into which the НРС-1 solution is simultaneously thrown, and pre-heated 35-40 ° C rods 10. located in the middle of the sliding containers of the tensioner 6. Experiments have shown that practically no LDC solution flows out of the tensioners 6, since the solution quickly hardens upon expansion and loses fluidity. The rods 10 contribute to a more intensive expansion of the LDC-1 and the tension of the selection cable 3

The heated rod, as shown by experiments, allows 4–5 hours to reduce the time for the passage of the HPC-1 hydration reaction. In addition, the rods 10 located in the tensioning devices 6 make it possible to reduce the volume of the NRS-1 and after welding the mesh, the presses 7 are removed from the cable selection, the tensioning devices 6 are removed, from which the rods 10 are pulled.

After that, the tensioning devices can be reused to create stresses in one or another of the supporting elements of building structures.

When using such a device

the tension of the mesh does not require the use of mechanisms, chain hoists, jacks and other bulky devices. Therefore, this device can be used in any conditions, including at the factory,

and directly at the construction site.

In addition, the tension due to the expansion of the NRS-1 occurs uniformly in both the longitudinal and transverse directions of the mounted tension mesh, which increases the productivity and manufacturing quality of mesh systems. When carrying out the tension of the grids according to a new technical solution, no rush was noted

individual threads of the mesh from each other.

Claims (1)

SUMMARY OF THE INVENTION A wire mesh pretension apparatus comprising power frame, in the corners of which tensioning mechanisms are mounted and tension cable located along parabolic curves is fitted with a selection cable equipped with double-sided kpiOKaMH for fastening wire mesh, characterized in that, in order to increase the uniformity of the tension of the mesh, the tension mechanisms are made in the form of a blanked end and cut into separate parts along the diametrical plane of a cylindrical pipe filled with a solution of expanding substance, each of the individual parts of the pipe being welded on the outer surface into sections of channels that tightly bent around the selection cable. . (Dual / S A h Y Figure 3 young to  V.-i