RU2579829C1 - Anchor device - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: higher reliability of anchor clamp on anchor connections of glass and basalt plastic, simplified design. Anchor device for non-metallic anchor connections comprises reinforcement bar or cable, and metal clamp, which consists of lower and upper jaws of rectangular section, coupled by coupling bolts with covering reinforcement rod or cable coupling bolts are arranged in through holes made in upper and lower jaws in two rows with 2-4 holes at distance between rows equal to 2-4 reinforcement rod diameters. Lower jaw has T-shaped terminal for connecting it with pulling device and frame to accommodate tie rod end.

EFFECT: simplified design.

1 cl, 4 dwg

Description

The invention relates to building structures, namely to anchor ties made of composite materials, mainly from basalt plastic or fiberglass.

Known anchor devices for testing flexible ties of multilayer wall structures by a tearing machine (tester) HYDRAJAWS 2000, representing a metal anchor connection with a bolt clamp at the end for connection with a tearing machine. / Manufacturer LLC OP Volzhsky fixture, Lipetsk, website http://www.bestkrep.ru/415.shtml/.

The closest analogue is an anchor device containing a reinforcing bar and a metal sleeve pressed onto the rod with dies. / RF patent No. 2005147, cl. E04C 5/12, publ. 12.30.93./

A disadvantage of the known structures is the complexity of the design due to the need for a high degree of processing of the working surfaces of the clamp. In addition, the known anchor devices are designed for metal rods and ropes and the corresponding efforts to compress them. When using such clamps for non-metallic reinforcement made of glass and basalt plastic, due to the uneven distribution of the compression forces along the length of the anchor, the break of the rod occurs with less effort due to the weakening of the cross section of the rod in the places of its capture and the increased fragility of the composite material.

The technical problem is to increase the reliability of fixing the anchor clamp on the anchor ties of glass and basalt plastic while simplifying the design of the anchor device.

The problem is solved in such a way that in an anchor device for non-metallic anchor ties containing a reinforcing bar or rope and a metal clip fixed to it, according to the invention, the metal clip consists of lower and upper jaws of rectangular cross section, tightened together by tightening bolts with a grip of the reinforcing bar rod or rope, coupling bolts are placed in through holes made in the upper and lower jaws in two rows of 2-4 holes at a distance between the rows of 2-4 diameter reinforcing of the rod, the lower jaw has a T-shaped trailer for coupling thereof with the pull device and a spar for placing the end of the anchor links.

The proposed device is characterized in that the metal clamp consists of lower and upper jaws of rectangular cross-section, tightened together by coupling bolts with a grip of the reinforcing bar or rope, coupling bolts are placed in through holes made in the upper and lower jaws in two rows of 2-4 holes at a distance between the rows equal to 2-4 diameters of the reinforcing bar, while the lower lip has a T-shaped end for connecting it to the pulling device and a spar to accommodate the end of the anchor connection.

The proposed design with the specified parameters provides reliable anchor clamping at the end of a composite glass- or basalt-plastic anchor bond - an anchor rod or flexible bond.

The distance between the rows of bolts and between the bolts is selected depending on the diameter of the reinforcing bar or rope from the condition that the deflection of the upper jaw is prevented and the compressive load is evenly distributed when the pulling force is applied to ensure that the pulling force is transmitted without weakening the cross section of the bar in the gripping zone.

As a material used for pressing upper and lower jaws, hardened structural carbon steel M 45 or hardened spring-spring structural steel M 65G is used. On the working surface of the jaws, incisions with an oblique slope are applied to increase adhesion to the reinforcing bar or rope.

The technical result consists in simplifying the anchor device while increasing the reliability of its attachment to anchor ties made of composite materials, including basalt-plastic and fiberglass flexible ties and reinforcing bars.

In FIG. 1 shows an anchor device; FIG. 2 is the same as in FIG. 1, side view, FIG. 3 is the same as in FIG. 1, top view, FIG. 4 is a test diagram of a flexible communications test.

An anchor device consists of a reinforcing bar or rope 1 and a metal clamp 2, consisting of an upper jaw 3 and a lower jaw 4. In the jaws 3 and 4 there are made coaxially located through holes 5 in which the coupling bolts are placed 6. The lower jaw is made twice as thick top and has a trailer 7 for connection with a pulling device. In addition, a spar 8 is made on the lower jaw to accommodate the end of the anchor connection of the reinforcing bar or rope 1 with a depth of at least 1/3 of the diameter of the bar.

To test flexible connections, the end of the anchor connection is placed in the spar 8 of the lower jaw 4 and pressed with the upper jaw 3 using the coupling bolts 6. The end 7 of the lower jaw 4 is connected to the pulling device 9 and a pulling force is applied until the anchor is destroyed (torn) or pulled out of the wall construction without destruction.

Example.

Conducted tests of flexible connections for pulling out according to the scheme (see Fig. 4).

When testing a flexible basalt-plastic bond fixed in a masonry based on light concrete blocks under a uniformly distributed load of 1/3 N _p , part of the bonds emerging from the wall plane is fixed in the center between the two jaws of the metal clamp using tightening bolts 6 The end of the rod is placed in the spar of the lower jaw tip, the lower jaw tip is fixed in the HYDRAJAWS 9 tearing machine. A sufficient load is applied to the handle of the tearing machine to pull the reinforcement from the concrete. The pull out force is determined by the pressure gauge.

The parameters of the metal clamp for testing anchor ties with a diameter of 4-7.5 mm are as follows: the lower jaw is rectangular in size 50 × 70 mm with a T-shaped end welded to it for fixing in a tearing machine. The thickness of the lower jaw is 10 mm. The size of the upper sponge is 50 × 70 mm, the thickness is 5 mm. The jaws are interconnected by tie bolts with a diameter of 10 mm with washers. The spar depth is 2 mm.

Through holes in the lower and upper jaws are drilled with a diameter of 10 mm in 2 rows at a distance of 26 mm between the rows with a pitch of 23 mm, into which M10 bolts are screwed. The distance from the edge of the plate to the center of the hole should be at least 12 mm. The working surfaces of the plates must be sanded and even, for an exact fit of the mating sides.

The design of the clamp provides for testing the breakout of flexible connections with diameters of 4-7.5 mm.

For comparison, a collet clamp and a grip of the HYDRAJAWS puller were used.

Test data are summarized in table.

The table shows the readings of the effort to break blocks of cellular expanded clay concrete from the masonry according to the test results at different embedment depths for 3 variants of flexible basalt-plastic bonds: GALEN BPA 300-4-2P (1 option), GALEN BPA 300-6-2P (2 option), GALEN BPA 300-7.5-1P (option 3).

Evaluation of the strength of the bearing capacity of the anchor fasteners was carried out after a set of strength of the joint solution according to the standard method for determining the bearing capacity of the anchor fasteners.

In examples No. 1,2, slippage of the connection in the clamp is not observed.

In example No. 3 there was a gap in communication.

In example No. 4, there is a communication gap at the installation location of the clamp of the HYDRAJAWS puller.

As a result, it follows that when using known clamps, the anchor bond is broken in the capture zone of the anchor bond at loads lower than the maximum permissible as a result of weakening the cross-section of the rope (rod). When using the clamp of the proposed design, the bond break occurs at the maximum permissible values and above the design resistance as a result of the uniform load distribution during the application of the pullout force.

Anchor device for non-metallic anchor ties can be used to test the tearing of flexible ties and anchors in multilayer wall structures, as well as for tensioning reinforcement in concrete structures.

Claims (1)

An anchor device for non-metallic anchor connections, containing a reinforcing bar or rope, and a metal clamp fixed to it, characterized in that the metal clamp consists of lower and upper jaws of rectangular cross-section, tightened together by coupling bolts with a grip of the reinforcing bar or rope, coupling bolts are placed in through holes made in the upper and lower jaws in two rows of 2-4 holes at a distance between the rows equal to 2-4 diameters of the reinforcing bar, while the lower jaw has a T-shaped to ontsevik for connecting it with a pulling device and a spar for placing the end of the anchor connection.

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