CN107589015A - A kind of geosynthetics stretching or drawing test clamp device - Google Patents

Abstract

The invention relates to a fixture device for tensile or pull-out tests of geosynthetic materials, which comprises an upper movable beam, a lower fixed beam, a vertically fixed rigid rod, an upper plate clamp, a lower plate clamp, an external telescopic mechanism connected with a control unit, and an internal Telescopic mechanism, the lower plate fixture is fixedly installed on the lower fixed beam, the vertical fixed rigid rod is fixedly installed on the lower fixed beam, the upper movable beam passes through the vertical fixed rigid rod and can move up and down along it, and the upper plate clamp is located on the lower plate The upper part of the clamp is connected with the upper movable beam through connecting pieces on both sides, the external telescopic mechanism is arranged between the upper movable beam and the lower fixed beam, and the internal telescopic mechanism is installed between the upper clamp and the upper movable beam. The device adopts an electric telescopic rod that can be automatically retracted, avoiding the cumbersome process of screwing the screw, making the operation simpler, and at the same time providing a uniform clamping force for the sample in its width direction, so that the test result is more accurate.

Description

A fixture device for tensile or pull-out test of geosynthetics

technical field

The invention belongs to the technical field of geotechnical engineering, and in particular relates to a fixture device for tensile or pull-out test of geotechnical synthetic materials.

Background technique

In the tensile or pull-out test of geosynthetics, the clamping force is obtained by tightening the threaded rod. This operation is not only cumbersome, but also easily causes uneven clamping force in the width direction of the geosynthetics, which affects the accuracy of the test results. sex. Chinese patent 201710191404.7 discloses a portable comprehensive tester for geosynthetics, including a vertical pressure device, a shear box, a drive device, a data acquisition device, a tensile peeling test device and a foldable support tester, a displacement sensing device, Wherein, the vertical pressurizing device is fixed to the tester bracket by bolts, the lower part of the shearing box is provided with a slidable chute with balls fixed on the support, so that the shearing box can slide freely in the length direction, and the driving device passes through Bolts and iron rods are fixed on one end of the tester, the data acquisition device is fixed on the other end of the tester bracket through the bracket, the tensile peeling test device is fixed on the upper part of the tester bracket through the T-shaped slide rail and the support, and the foldable bracket is installed through the metal The folding leaf can be folded conveniently. The tester can complete the direct shear test of soil and the tensile, friction, peeling and pulling tests of geosynthetics, improve the efficiency of the test and the consistency of the test results, and meet the needs of experiments in different locations. However, the device is cumbersome to operate when testing the sample, resulting in low testing efficiency, and the force on the sample in its width direction is not uniform, which affects the accuracy of the results.

Contents of the invention

The object of the present invention is to provide a geosynthetic tensile or pull-out test fixture device in order to solve the above problems, so as to solve the problems of cumbersome installation process of samples and inaccurate test results.

The object of the present invention is achieved through the following technical solutions:

A geosynthetic tensile or pull-out test fixture device, comprising an upper movable beam, a lower fixed beam, a vertically fixed rigid rod, an upper plate clamp, a lower plate clamp, an external telescopic mechanism connected with a control unit, and an internal telescopic mechanism, Wherein, the lower plate clamp is fixedly installed on the lower fixed beam, the vertical fixed rigid rod is fixedly installed on the lower fixed beam, and distributed on both sides of the lower plate clamp, and the upper movable beam passes through the vertical To the fixed rigid rod and can move up and down along it, the upper plate clamp is located on the upper part of the lower plate clamp, and its two sides are connected with the upper movable beam through the connecting piece, and the external telescopic mechanism is arranged on the upper movable beam and the lower fixed beam. Between the crossbeams and distributed on the outside of the vertically fixed rigid rods, the internal telescopic mechanism is installed between the upper plate clamp and the upper movable crossbeam.

Further, both the external telescopic mechanism and the internal telescopic mechanism are electric telescopic rods.

Further, the control unit includes a control valve and an overcurrent protector that can separately control the internal telescopic mechanism and the external telescopic mechanism, and controls the internal telescopic mechanism and the external telescopic mechanism to extend or contract, and the rate is kept consistent, ensuring The accuracy of the test.

Further, the vertically fixed rigid rod is provided with a U-shaped clamping groove and a U-shaped steel clip, and the clamping force required in the test is obtained by the reaction force provided by the vertically fixed rigid rod.

Further, the bottom of the upper disc clamp is provided with multiple rows of arc protrusions, and the top of the lower disc clamp is provided with arc grooves that cooperate with the arc protrusions at the bottom of the upper disc clamp.

Further, the surfaces of the arc protrusions and arc grooves are provided with anti-slip protrusions.

Further, the above-mentioned anti-slip protrusions are arranged in a dislocation manner up and down.

Further, there are three internal telescoping mechanisms, which are located at the quartering position of the upper plate clamp in the length direction, and the force is applied evenly at multiple points so that the sample can obtain a uniform clamping force in the width direction, so that the test The result is more accurate.

Further, the connecting piece is an iron chain, and the upper plate fixture is lifted to a certain height by extending the external electric telescopic rod, so as to facilitate the removal of the geosynthetic material.

Further, the vertical fixed rigid rods, connectors and external telescopic mechanisms are symmetrically distributed on both sides of the lower fixed beam.

During the specific test, first remove the U-shaped steel clip, use the external electric telescopic rod to raise the upper movable beam to a certain height, leave a certain space between the upper plate clamp and the lower plate clamp, and then place the geosynthetic material flat in the space , start the reverse switch of the control valve to make the external electric telescopic rod contract. The disk grips are snapped together to apply a clamping force to the geosynthetics prior to performing the geosynthetics tensile or pull-out test. After the test, remove the U-shaped steel clamp, restart the external electric telescopic rod and close the internal electric telescopic rod at the same time, so that the upper plate clamp can be raised to a certain height under the action of the upper movable beam and iron chain, then take out the geosynthetic material, and finally close An external electric telescoping pole will suffice.

Compared with the existing technology, this device adopts an electric telescopic rod that can automatically expand and contract, avoiding the cumbersome process of screwing the screw, making the operation more simple, and at the same time providing uniform clamping force for the sample in its width direction, so that the test results more precise.

Description of drawings

Fig. 1 is the schematic diagram of the front view structure of the fixture device of the present invention;

Fig. 2 is a schematic structural view of the upper plate clamp and the lower plate clamp of the present invention;

In the figure: 1-upper movable beam; 2-vertically fixed rigid rod; 3-lower fixed beam; 4-U-shaped card slot; 5-internal electric telescopic rod; 6-external electric telescopic rod; 8-lower plate clamp; 9-iron chain; 10-arc protrusion; 11-arc groove; 12-anti-slip protrusion.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1

As shown in Figure 1 and Figure 2, a geosynthetic tensile or pull-out test fixture device includes an upper movable beam 1, a vertically fixed rigid rod 2 with a U-shaped slot 4 and a lower fixed beam 3. Rigid frame, internal electric telescopic rod 5 for providing clamping force, external electric telescopic rod 6 and iron chain 9 for lifting the upper plate clamp 7, with arc protrusions 10, arc grooves 11 and anti-skid protrusions 12 upper disc clamp 7 and lower disc clamp 8. The lower plate fixture 8 is fixedly installed on the lower fixed crossbeam 3, the vertically fixed rigid tie rod 2 is fixedly installed on the lower fixed crossbeam 3, and distributed on both sides of the lower plate fixture 8, and the upper movable crossbeam 1 passes through the vertically fixed rigid tie rod 2 And can move up and down along it, the upper plate fixture 7 is located on the upper part of the lower plate fixture 8, and its two sides are connected with the upper movable beam 1 through iron chains 9, and the external electric telescopic rod 6 is arranged between the upper movable beam 1 and the lower fixed beam 3 , and distributed on the outside of the vertically fixed rigid pull rod 2, the internal electric telescopic rod 5 is installed between the upper plate clamp 7 and the upper movable beam 1. The control unit includes a control valve and an overcurrent protector that can separately control the internal telescopic mechanism and the external telescopic mechanism, and controls the internal telescopic mechanism and the external telescopic mechanism to extend or contract at the same rate to ensure the accuracy of the test. A U-shaped card slot 4 and a U-shaped steel clip are provided to the fixed rigid tie rod, and the clamping force required in the test is obtained by the reaction force provided by the vertically fixed rigid tie rod. The arc protrusions 10 and the anti-slip protrusions 12 on the surface of the arc grooves 11 are arranged in an up-and-down dislocation manner.

There are 3 internal electric telescopic rods 5, which are located at the quarter position of the upper plate fixture 7 in the length direction, and the multi-points are evenly stressed so that the sample can obtain a uniform clamping force in its width direction, making the test results more accurate. precise.

During the test, first remove the U-shaped steel clips, use the two external electric telescopic rods 6 to lift the upper movable beam 1 to a certain height, leave a certain space between the upper plate clamp 7 and the lower plate clamp 8, and then place the geosynthetic material flat Put it in this space, start the reverse switch of the control valve, and make the two external electric telescopic rods 6 contract. When the upper surface of the upper movable beam 1 drops below the U-shaped slot, install the U-shaped steel clip and close the two external electric telescopic rods. Rod 6, start the three internal electric telescopic rods 5 at the same time, so that the upper and lower disc clamps are snapped together to apply a clamping force to the geosynthetic material, and then perform a tensile or pull test on the geosynthetic material. After the test is over, remove the U-shaped steel clip, restart the external electric telescopic rod 6 and close the internal electric telescopic rod 5 at the same time, so that the upper plate clamp 7 is lifted to a certain height under the action of the upper movable beam 1 and the iron chain 9, and then take out the geotechnical Synthetic material, and finally close the external electric telescopic rod 6.

Claims (10)

1. A geosynthetic material tensile or pull-out test fixture device is characterized in that it comprises an upper movable beam, a lower fixed beam, a vertically fixed rigid pull rod, an upper plate clamp, a lower plate clamp, and an external telescopic beam connected to the control unit. mechanism and internal telescopic mechanism, Wherein, the lower plate clamp is fixedly installed on the lower fixed beam, the vertical fixed rigid rod is fixedly installed on the lower fixed beam, and distributed on both sides of the lower plate clamp, and the upper movable beam passes through the vertical To fix the rigid rod and move up and down along it, the upper plate clamp is located on the upper part of the lower plate clamp, and its two sides are connected with the upper movable beam through connecting pieces. The external telescopic mechanism is arranged between the upper movable beam and the lower fixed beam, and is distributed outside the vertically fixed rigid rods, and the internal telescopic mechanism is installed between the upper plate clamp and the upper movable beam. 2 . A geosynthetic tensile or pull-out test fixture device according to claim 1 , wherein both the external telescopic mechanism and the internal telescopic mechanism are electric telescopic rods. 3 . 3. A kind of geosynthetic material tensile or pull-out test fixture device according to claim 1, it is characterized in that, described control unit comprises the control valve that can control internal expansion mechanism and external expansion mechanism respectively and process flow protector. 4 . A geosynthetic tensile or pull-out test fixture device according to claim 1 , wherein the vertically fixed rigid pull rod is provided with a U-shaped slot and a U-shaped steel clip. 5. A kind of geosynthetics tensile or pull-out test fixture device according to claim 1, is characterized in that, the bottom of described upper plate fixture is provided with multiple rows of arc protrusions, and the top of described lower plate fixture An arc groove is provided to cooperate with the arc protrusion at the bottom of the upper plate clamp. 6 . A geosynthetic tensile or pull-out test fixture device according to claim 5 , wherein anti-slip protrusions are provided on the surfaces of the arc protrusions and arc grooves. 7 . 7 . A geosynthetic tensile or pull-out test fixture device according to claim 6 , wherein the anti-skid protrusions are arranged in a dislocation manner up and down. 8 . 8. A geosynthetic tensile or pull-out test fixture device according to claim 1, characterized in that, said internal telescoping mechanism is provided with three, located at the quartering position of the upper plate fixture length direction . 9 . A geosynthetic tensile or pull-out test fixture device according to claim 1 , wherein the connecting piece is an iron chain. 10. A kind of geosynthetic material tensile or pull-out test fixture device according to claim 1, is characterized in that, described vertically fixed rigid tie bar, connecting piece and external telescoping mechanism are symmetrically distributed on the lower fixed beam. sides.