SU1665262A1 - Device for strength test of load-bearing units and sectional members - Google Patents

Abstract

Usage: in construction, in test structures of bridges. SUMMARY OF THE INVENTION: In the device, the base is made in the form of a pair of wedge-shaped swinging arms, pivotally interconnected tops and connected to a power movable three-link, with a power element of varying length, while the broadened parts of the levers are equipped with swiveling butt joints. 7 il.

Description

The invention relates to the construction, in particular to the testing of bridge structures.

A stand for testing the strength of the hull section, containing the hydraulic system of the load and the power box (1), is known.

A disadvantage of the known device is that it cannot be used for testing structures such as bridges.

The closest known technical solution to the invention is a device for strength testing of power structures and their power elements, including a base, equipped with a rotary hydraulic cylinder, the stem of which is made with a loop (2).

A disadvantage of the known device is that it does not provide for carrying out tests simulating real conditions without readjustment in both laboratory and field conditions.

The purpose of the invention is to provide load tests that simulate real conditions of operation, without readjustment of the device, the possibility of carrying them out in laboratory and field conditions and testing various structures without conducting full-scale tests.

The goal is achieved by the fact that in a device for strength testing of power structures and their constituent elements, including a base, equipped with a rotary hydraulic cylinder, the stem of which is made with a loop, the base is made in the form of a pair of wedge-shaped swing arms pivotally connected to each other by force toes and joined the three-member is a power element of varying length, while the broadened parts of the levers are equipped with swiveling butt joints.

Figure 1 shows the proposed device, a general view; Fig 2 - rotary

-g

E

ABOUT

about ate

Yu About N)

joint device; on fig.Z - test power beams; figure 4 - test design with the use of technological beams; figure 5 - test multiple docked structures; figure 6 - test ramp; Fig. 7 shows the test of the rods for tension - compression.

The device for strength tests of power structures consists of a base in the form of wedge-shaped swinging arms 1 with vertices interconnected by a hinge 2. The broadened parts of the levers 1 are equipped with rotating butt joints 3 and 4 and connected by a Power element of varying length in the form of a hydraulic cylinder 5 with hydraulic actuator and distributor 6.

The levers 1 have loops 7 on the inner faces for hinging the hydraulic cylinder 5, and in the wide parts there are holes 8 for mounting with the help of pivoting butt tools 3 and 4 having holes 9. When two beams 10 are tested simultaneously (Fig. 3 ) two devices are used. Beams 11 are used to test the individual structures (Fig. 4) or several docked structures. To test the ramps 12 (Fig. 6) or the rods 13, one device is used.

/

The device works as follows.

The working fluid under a given pressure enters one of the cavities of the hydraulic cylinder 5 of double action. The forces developed by the hydraulic cylinder 5 are applied to the levers 1 and through the butt fixtures 3 and 4 are transmitted to the test structures 10 and 11 in the form

bending moments during operation of the hydraulic cylinders 5 in one direction and shear forces during operation of the hydraulic cylinders 5 in different directions (Fig.3-5). The device can be used to test the ramps 12 (Fig. B) for bending and the rods 13 for tensile - compression.

The magnitudes of the forces and moments, their directions can be changed, the pressure changes and

direction of fluid flow in the hydraulic system. Pressure and force control can be performed by a calibrated pressure gauge.

The use of the invention allows

on the same device to carry out tests of different units under different load conditions, which gives a significant saving of time and money compared with field tests.

Fm.2

Fig.Z

9g. "

6

j ±

TO

FIG. 6

Claims (1)

(54X57) DEVICE FOR STRENGTH TESTS OF POWER STRUCTURES AND THEIR COMPONENT ELEMENTS, including a base equipped with a rotary hydraulic cylinder, the rod of which is made with a loop, which, in order to provide load tests simulating real operating conditions, without reconfiguring the device, the possibility of carrying them out in laboratory and field conditions and testing various designs without field tests, the base is made in the form of a pair of wedge-shaped swinging levers pivotally connected between at their peaks and combined in a power movable three-link with a power element of varying length, while the broadened parts of the levers are equipped with rotary butt devices.