RU170467U1 - Device for determining the tensile strength of composite polymer reinforcement - Google Patents

Abstract

The utility model relates to devices for determining the mechanical characteristics of materials, specifically, to a device for determining the tensile strength of composite polymer reinforcement used in construction. The device comprises a frame, a loader, a fixed and a movable rod attachment points, equipped with a rotary link connecting the frame with a loader, a movable attachment point mounted on a link, and each of the attachment points is made in the form of profiled lodgements with U-shaped grooves, along the length of which are clamped overlays. The angle of entry of the reinforcing bar into the U-shaped trough is 0 ° to the axis of the working section, and then increases every 5–20 ° by 10–10 °. EFFECT: increased accuracy and increased technological efficiency of tensile tests of composite polymer reinforcement. 3 ill.

Description

The utility model relates to devices for determining the mechanical characteristics of materials, specifically, to a device for determining the tensile strength of composite polymer reinforcement (KPA).

To determine the KPA tensile strength at the present time, the test method provided for in GOST 31938-2012 “Composite polymer reinforcement for reinforcing concrete structures is used. General specifications. "

A known device for testing the axial tension of KPA samples includes a tensile testing machine, adapter couplings for monoling the ends of the sample, and a load-extension characteristics recorder (Appendix B, GOST 31938-2012). Its use for operational control of the quality of manufacturing reinforcement is impossible, because the result is obtained only a few tens of days after sampling. The use of this device is unacceptable for operational control increases the duration of obtaining information about the strength characteristics of the rod, in addition, it requires additional significant costs for the manufacture of couplings for each sample separately.

As a prototype adopted a device for determining the break of textile materials (RU No. 2173843, 2001). This device includes a frame, a loader, fixed and movable nodes of the rod. The rod is mounted on the movable and fixed parts with screw clamps.

The disadvantage of the prototype is that when it is used to fasten a straight KPA rod using clamps, compression of the outer layers, the occurrence of voltage concentrators and the exit from the working state of the cut filler threads will occur.

The same phenomenon is observed when testing CPA on typical tensile testing machines, when the inner layers of the reinforcing bar are excluded from work due to the "fluidity" of polymer bonds at the molecular level. All this reduces the accuracy of the tests.

In addition, for KPA manufactured on equipment that does not have the means of metrological support of the technological process, the strength properties along the length of the rod can vary significantly.

Therefore, the task of full-scale testing of samples, for example, 12 meters long, is very urgent for the CPA.

The objective of the utility model is to increase the accuracy and increase the technological efficiency of tensile testing of composite polymer reinforcement.

The technical result is achieved by the fact that the device for determining the tensile strength of composite polymer reinforcement, including a frame, a loader, a fixed and a movable rod attachment points, is equipped with a rotary link connecting the frame with a loader, a movable attachment point is mounted on the link, and each of the attachment points is made in in the form of profiled lodges with U-shaped grooves, along the length of which clamping plates are mounted, and the angle of entry of the reinforcing bar into the U-shaped groove is 0 ° to the axis of the working portion, and then increased every 10-20 diameters at 5-10 °.

The technical solution of the proposed device is shown below in the drawings:

- FIG. 1. - general view of the bench for testing full-scale samples of polymer composite reinforcement;

- FIG. 2. - an enlarged image of the movable part of the stand (view B, Fig. 1);

- FIG. 3. - a section of a U-shaped trough in the place of attachment of the reinforcement bar with a clamp (AA, Fig. 2.).

The proposed device comprises a spatial power frame 1 equipped with end bridges 2 and 3. A lodgement 4 is fixedly mounted on the jumper 2, and a link 5 is pivotally mounted on the jumper 3, on which the lodgement is fixed 6. A loader is attached to the lower end of the link 5, for example, a hydraulic cylinder 7.

Between the axis of the hinge 8 of the scenes 5 and the axis of the hydraulic cylinder 7, the distance is Rmax.

The construction of lodgments 4 and 6 are similar. They are mounted mirror to each other. Each lodgement in the side view is made profiled, on the side surface of the lodgement there is a U-shaped groove 9. The input radius of the lodgement is Rmin. At this radius, the reinforcing bar 10 connects the tool holders 4 and 6, entering the groove 9 at an angle of 0 ° to the axis of its symmetry. Next, the rod 10 is laid in the groove 9 and pressed against it by profiled plates 11. As you move away from the input section, the angle of inclination of the rod 10 Lodges are interchangeable for different radii of the tested reinforcement.

The device operates as follows.

Before starting the test, the rod 10 is placed in the lodgments 4 and 6, fixing the ends of the rod with the linings 11. The first pair of linings fixes the angle of entry of the rod on the lodgement 0 deg. Then the rod 10 is bent by 10-15 °. And set the next pair of pads 11. At the end, the shank of the rod 10 can be fixed at an angle of 90 °. To the axis of the test site.

When the hydraulic cylinder 7 is turned on, the link 5 begins to rotate relative to axis 8, transmitting force to the tool tray 6 in magnitude proportional to the ratio Rmax / Rmin. The tensile force through the jumpers 2 and 3 is transmitted to the frame 1. In this case, the corresponding elongation of the rod 10 is measured.

Making a sample of samples from one batch and changing the modes of the technological process, one can judge the influence of its parameters on the change in the strength of the reinforcing bar as a whole.

Using the device will increase the reliability of the obtained test results and provide the possibility of operational quality control of the manufacture of KPA.

Claims (1)

A device for determining the tensile strength of a composite polymer reinforcement, including a frame, a loader, a fixed and movable rod attachment points, characterized in that it is equipped with a rotary link connecting the frame with the loader, the movable attachment node is mounted on the link, and each of the attachment points is made in the form shaped lodges, on whose side U-shaped grooves are made, along the length of which clamping plates are mounted, and the angle of entry of the reinforcing bar into the U-shaped groove is 0 ° to the working axis bringing the plot, and then increases every 10-20 diameters by 5-10 °.

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