CN110220791A - A kind of cylindrical concrete component axial direction tensile test apparatus - Google Patents

Abstract

A kind of cylindrical concrete component axial direction tensile test apparatus, including apparatus main body and data collection system, the apparatus main body includes first assembly, the second component, the first assembly and second component axisymmetricly structure, are the test station for placing cylindrical concrete component to be measured between the first assembly and the second component；The first assembly includes and the clamping bar of closed loop electro-hydraulic servo universal testing machine connection, flexible wire ropes, rolling bearing, bearing are opposite with connection component that wirerope connect, bearing relative position fixed beam, power transmission main body cover, fixture, fixture fixes rod piece and concrete test block positioning device；The power transmission main body cover is provided with screw hole, and the screw hole is used for the shank of bolt of jockey, and the shank of bolt jockey controls the elastic of fixture by the rotation of bolt, and there is concrete test block positioning device in power transmission main body cover end.Operation of the present invention is more convenient, error is smaller.

Description

An axial tensile test device for cylindrical concrete members

technical field

The invention relates to a concrete material test device, in particular to a test device for measuring the axial tensile stress of cylindrical concrete members, and belongs to the field of building material test equipment.

Background technique

The axial tensile strength of concrete is an important indicator of the mechanical properties of concrete materials, which has important reference significance for the construction design of concrete materials used in industrial and civil buildings, marine buildings, bridges and roads, etc., especially for crack control check calculation. significance. There are two main methods for testing the axial tensile strength of concrete. One is indirect measurement, such as splitting experiment, but the measured experimental data needs to be processed by later theoretical derivation, which is rather cumbersome. The other is direct measurement. This measurement method is simple and the data can be obtained by simple analysis of the axial tensile strength of the concrete block. However, this method of direct measurement has higher requirements on the tensile device, because the axial tension of the test block must be ensured. Therefore, there is a need for a method that is simple to operate and can ensure axial stretching. In this way, the tensile mechanical properties of concrete can be better determined, and more accurate reference data can be provided for the application and design of concrete materials.

SUMMARY OF THE INVENTION

In order to overcome the disadvantages of complicated operation and large error of the existing concrete axial tensile strength testing method, the present invention provides an axial tensile testing device for cylindrical concrete members with more convenient operation and smaller error.

The technical scheme adopted by the present invention to solve its technical problems is:

An axial tensile test device for cylindrical concrete members, comprising a device main body and a data acquisition system, the device main body includes a first component and a second component, and the first component and the second component are axial Symmetrical structure, between the first component and the second component is a test station for placing the cylindrical concrete member to be tested;

The first component includes a clamp rod connected with the closed-loop electro-hydraulic servo universal testing machine, a flexible wire rope, a rolling bearing, a connecting assembly connecting the bearing and the wire rope, a rod for fixing the relative position of the bearing, a force transmission main body shell, a clamp, and the clamp is relatively fixed. Rod and concrete test block positioning device; a rolling bearing is arranged in the shell of the main body of the force transmission, one end of the rolling bearing is connected to the shell of the main body of the force transmission by a wire rope, and the other end of the bearing is connected with the flexible steel wire rope through the connecting assembly connecting the bearing and the wire rope connected, the flexible steel wire rope is connected with the clamp rod, and the clamp rod is connected with the closed-loop electro-hydraulic servo universal testing machine.

The power transmission main body shell is provided with screw holes, and the screw holes are used to connect the bolt rods of the clamps. The bolt rods are connected to the clamps, and the tightening of the clamps is controlled by the rotation of the bolts. Block positioning device.

Further, the bolt and the clamp are not fixedly connected, but can be rotated relative to each other, and the bolt can be rotated to control the tightness of the clamp.

Still further, the concrete test block positioning device is made of a certain elastic rubber skin, and the cylindrical concrete is fixed in the center of the shell of the force transmission main body.

The beneficial effects of the present invention are mainly manifested in that the operation is more concise, the shaft pulling center is easier to find and the control error is smaller due to the use of the flexible steel wire rope.

Description of drawings

FIG. 1 is a schematic diagram of the overall arrangement of the present invention.

Figure 2 is a schematic structural diagram of the present invention.

Figure 3 is a detailed view of the connection between the bearing and the wire rope connection assembly and the rolling bearing.

Fig. 4 is a bearing diagram.

Figure 5 is a detailed view of the connection between the tension bolt and the clamp.

Figure 6 is a detail view of the jig.

Figure 7 is a detail view of the positioning device.

Fig. 8 is a positional relationship diagram of the clamp and the force transmission main body shell.

In the figure: 1 is the clamp rod connected with the closed-loop electro-hydraulic servo universal testing machine, 2 is the first flexible wire rope, 3 is the connecting assembly connecting the bearing and the wire rope, 4 is the rolling bearing, and 5 is the first bearing. The relative position fixing rod , 6 is the second flexible wire rope, 7 is the second bearing relative position fixing rod, 8 is the connecting ring, 9 is the force transmission main body shell, 10 is the relative fixing rod of the clamp, 11 is the clamp, 12 is the elastic bolt, 13 is the The force transmission buckle, 14 is a concrete test block positioning device, and 15 is a cylindrical concrete test block.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

Referring to Figures 1 to 8, an axial tensile test device for cylindrical concrete members includes a device main body and a data acquisition system. The device main body includes a first component and a second component. The first component and all The second component is an axisymmetric structure;

The first component includes a clamp rod 1 connected to the closed-loop electro-hydraulic servo universal testing machine, a first flexible wire rope 2, a rolling bearing 4, a connecting assembly 3 connecting the bearing and the wire rope, a first bearing relative position fixing rod 5, The second flexible wire rope 6, the second bearing relative position fixing rod 7, the force transmission main body shell 9, the clamp 11, the clamp relative fixing rod 10 and the concrete test block positioning device 14; the force transmission main body shell 9 is provided with Rolling bearing 4, one end of the rolling bearing 4 is connected with the main body shell 9 of the force transmission through the second flexible steel wire rope 6, and the other end of the rolling bearing 4 is connected with the first flexible steel wire rope 2 through the connecting assembly 3 connecting the bearing and the steel wire rope, the first flexible steel wire rope 2. The flexible steel wire rope 2 is connected with the clamping rod 1, and the clamping rod 1 is connected with the closed-loop electro-hydraulic servo universal testing machine.

The power transmission main body shell 9 has 3 screw holes (120 degrees connected to the center of the cylinder), and the 3 screw holes are used to connect the bolt rods of the clamps. Control the tightness of the clamps. The end of the force transmission main body shell 9 is provided with a concrete test block positioning device 14 .

Further, the bolt and the clamp are not fixedly connected, but can be rotated relative to each other, and the bolt can be rotated to control the tightness of the clamp.

Further, the concrete test block positioning device 14 is made of rubber skin with certain elasticity, and the cylindrical concrete is fixed in the center of the force transmission main body shell 9 .

In this embodiment, one end of the cylindrical concrete shaft tensile test piece 15 to be tested is first extended into the first component fixture, and the positioning device 14 locates the cylindrical concrete axial tensile test piece to be tested in the center between the fixtures 11 . . Tighten the bolts 12 inwards so that the clamps 11 clamp the cylindrical concrete shaft tensile test piece 15 to be tested. Similarly, the other end of the cylindrical concrete shaft tensile test piece 15 to be tested is clamped with the second component. Then, the clamping rod 1 and the second clamping rod 1 of the first component are respectively connected with the two end loading devices of the closed-loop electro-hydraulic servo universal testing machine (WAW-1000). After fixing the test piece, when the two ends of the test piece are subjected to vertical tension, if the axis of the test piece is not aligned, the first flexible wire rope 2 and the rolling bearing 4 can be adjusted accordingly by the tension force. Angle and position, make the specimen rotate slightly and re-align to achieve the state of axis alignment, the cylindrical concrete specimen is still under tension under the action of tensile force, start the loading device to start loading, and start the axial tension of the concrete member test. When the specimen breaks, according to the value F of the loading load displayed by the universal testing machine, the tensile strength of the concrete shaft tensile specimen to be tested can be calculated according to the formula: σ=F/A, where A is the specimen to be tested cross-sectional area.

When in use, tighten the cylindrical concrete shaft tensile specimen to be tested between the first member and the second member, then fix the clamping rod on the loading devices at the upper and lower ends of the electro-hydraulic servo universal testing machine, and start the electro-hydraulic servo universal testing machine. , and set the corresponding parameters. When the electro-hydraulic servo universal testing machine is working, when the specimen is broken, read the value F of the loaded load on the electro-hydraulic servo universal testing machine. According to the formula: σ=F/A, the waiting Measure the tensile strength of the concrete axial tensile specimen, where A is the cross-sectional area of the specimen to be tested.

Claims (3)

1. A cylindrical concrete member axial tensile test device, comprising a device main body and a data acquisition system, characterized in that the device main body comprises a first component, a second component, the first component and the described The second component is an axisymmetric structure, and between the first component and the second component is a test station for placing the cylindrical concrete member to be tested; The first component includes a clamp rod connected with the closed-loop electro-hydraulic servo universal testing machine, a flexible wire rope, a rolling bearing, a connecting assembly connecting the bearing and the wire rope, a rod for fixing the relative position of the bearing, a force transmission main body shell, a clamp, and the clamp is relatively fixed. Rod and concrete test block positioning device; a rolling bearing is arranged in the shell of the main body of the force transmission, one end of the rolling bearing is connected to the shell of the main body of the force transmission by a wire rope, and the other end of the bearing is connected with the flexible steel wire rope through the connecting assembly connecting the bearing and the wire rope connected, the flexible steel wire rope is connected with the clamp rod, and the clamp rod is connected with the closed-loop electro-hydraulic servo universal testing machine. The power transmission main body shell is provided with screw holes, and the screw holes are used to connect the bolt rods of the clamps. The bolt rods are connected to the clamps, and the tightening of the clamps is controlled by the rotation of the bolts. Block positioning device. 2. The axial tensile test device for cylindrical concrete members as claimed in claim 1, comprising a device main body and a data acquisition system, characterized in that, the bolts are connected with the clamp relatively rotatably, and the bolts are rotated to control the clamps. tightness. 3. The axial tensile test device for cylindrical concrete members according to claim 1 or 2, comprising a device main body and a data acquisition system, wherein the concrete test block positioning device is made of elastic rubber skin, Fix the cylindrical concrete in the center of the force transmission body shell.