CN220339895U - Extensometer and geotechnical cloth test system - Google Patents

Abstract

The embodiment of the application relates to the technical field of geosynthetic material tensile test and discloses an extensometer and geotechnical cloth testing system, wherein the extensometer comprises a first clamp, a second clamp, a guide rail and a base; the guide rail is vertically arranged on the base; the first clamp and the second clamp are respectively arranged on the guide rail and move relatively along the guide rail; the first clamp and the second clamp comprise a first clamping arm and a second clamping arm, the first clamping arm and the second clamping arm are oppositely arranged through an elastic part, one side of the first clamping arm opposite to the second clamping arm is in inclined surface arrangement, and when the first clamping arm and the second clamping arm are oppositely clamped through the elastic part, one side of the first clamping arm is in line contact with one side of the second clamping arm. By the mode, the test precision of geotechnical cloth is improved.

Description

Extensometer and geotechnical cloth test system

Technical Field

The embodiment of the application relates to the technical field of geosynthetic material tensile tests, in particular to an extensometer and geotechnical cloth testing system.

Background

Geotextile is a novel geosynthetic material, and is widely used in geotechnical engineering foundation fields such as water conservancy, electric power, mines, roads and railways, and the product quality of the geotechnical fabric directly influences the engineering quality, so that the geotechnical fabric needs to be detected before entering a field, and can be constructed and used after the quality is qualified.

The geotextile quality indexes comprise elongation, tensile strength, tearing strength, bursting strength and the like, the geotextile quality indexes are detected by randomly extracting geotextile samples with certain lengths for testing, the geotextile is usually subjected to tensile testing on a strong tester, the tensile force, the deformation distance and the like borne by the geotextile are obtained, and various parameters of the geotextile are tested through the tensile force, the deformation distance and the like.

The inventor discovers that in the existing geotechnical cloth testing system, the problem that the geotechnical cloth quality index cannot be accurately measured exists generally.

Disclosure of Invention

In view of the above problems, embodiments of the present application provide an extensometer and geotechnical cloth testing system for solving the above technical problems existing in the prior art.

According to one aspect of an embodiment of the present application, there is provided an extensometer comprising: the device comprises a first clamp, a second clamp, a guide rail and a base;

the guide rail is vertically arranged on the base;

the first clamp and the second clamp are respectively arranged on the guide rail and move relatively along the guide rail;

the first clamp and the second clamp comprise a first clamping arm and a second clamping arm, the first clamping arm and the second clamping arm are oppositely arranged through an elastic part, one side of the first clamping arm opposite to the second clamping arm is in inclined surface arrangement, and when the first clamping arm and the second clamping arm are oppositely clamped through the elastic part, one side of the first clamping arm is in line contact with one side of the second clamping arm.

Optionally, in some embodiments, a cross section of a line contact portion between the first clamping arm side and the second clamping arm side is wavy.

Optionally, in some embodiments, the elastic portion is a screw structure or a clamping structure.

Optionally, in some embodiments, the first fixture is movably disposed on the guide rail through a first connection portion; the second clamp is movably arranged on the guide rail through a second connecting part;

and a measuring column is arranged on the first connecting part in a penetrating manner at a position opposite to the second connecting part, and is used for abutting against the second connecting part to determine the minimum distance between the first clamp and the second clamp.

Optionally, in some embodiments, the extensometer further includes a fixed post;

the fixed column with guide rail parallel arrangement, fixed column one end set up in on the base, the fixed column other end with guide rail fixed connection is used for with the guide rail is fixed on the base.

Optionally, in some embodiments, the extensometer includes a first roller and a second roller, where the first roller and the second roller are respectively located at an end of the guide rail away from the base;

the first roller is connected with the first clamp through a traction rope, and the second roller is connected with the second clamp through a traction rope and is used for driving the first clamp and the second clamp to slide along the guide rail respectively.

Optionally, in some embodiments, a photoelectric encoder is further included, where the photoelectric encoder is connected to the first roller and the second roller, and is used to measure a moving distance of the first clamp and the second clamp.

The embodiment of the application also provides a geotechnical cloth testing system which comprises a chest expander, a controller and the extensometer in the embodiment;

the chest expander comprises a first tension clamp, a second tension clamp and a tension sensor, wherein the first tension clamp and the second tension clamp are arranged in a relatively movable manner, and the tension sensor is used for measuring tension between the first tension clamp and the second tension clamp; the first clamp and the second clamp are positioned between the first tension clamp and the second tension clamp;

the first clamp and the second clamp are used for clamping the test position of the test piece to be tested, and the first tension clamp and the second tension clamp are used for respectively clamping the two ends of the test piece to be tested;

when the first tension clamp and the second tension clamp pull the test piece to be tested, the first clamp and the second clamp are driven to move relatively;

the controller is respectively and electrically connected with the tension sensor and the photoelectric encoder, and is used for receiving a tension value between the first tension clamp and the second tension clamp and a movement distance between the first clamp and the second clamp, and testing the geotechnical cloth according to the tension value and the movement distance.

Optionally, in some embodiments, the first tension clamp and the second tension clamp each include a first tension clamp arm and a second tension clamp arm;

the first tension clamping arm and the second tension clamping arm are arranged in a relatively movable mode and used for clamping the test piece to be tested.

Optionally, in some embodiments, the abutting surfaces of the first tension clamping arm and the second tension clamping arm are wavy or zigzag.

According to the embodiment of the application, the clamp of the extensometer is improved, the contact surface between the clamping arms of the clamp is changed from original surface contact to line contact, in this way, the clamping arms can be accurately aligned with the marking lines on the geotechnical cloth, errors between the actual initial distance and the marking distance of the marking lines on the geotechnical cloth, which are caused by the fact that the clamping arms cannot be aligned with the marking lines on the geotechnical cloth, are avoided, and the accuracy of measuring various performance parameters of the geotechnical cloth is improved.

The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 illustrates a front view of an extensometer provided by an embodiment of the utility model;

FIG. 2 illustrates a side view of an extensometer provided by an embodiment of the utility model;

FIG. 3 is a schematic structural view of a first fixture according to an embodiment of the present utility model;

FIG. 4 illustrates an abutment surface schematic view of a first fixture provided by an embodiment of the present utility model;

FIG. 5 shows a schematic diagram of an elongation testing system according to an embodiment of the present utility model;

FIG. 6 is a schematic view of an abutment surface of the chest expander according to an embodiment of the present utility model;

fig. 7 is a schematic view of another abutment surface of the chest expander according to an embodiment of the present utility model.

Reference numerals in the specific embodiments are as follows:

1000. an extensometer; 100. a base; 200. a guide rail; 300. a first clamp; 400. a second clamp; 410. a clamping arm; 411. a first clamping arm; 412. a second clamping arm; 413. an elastic part; 414. a connection part; 415. a sleeve; 420. a measuring column; 500. fixing the column; 600. a roller; 610. a first roller; 620. a second roller; 630. a traction rope;

2000. a chest expander; 2100. a first tension clamp; 2200. a second tension clamp; 2210. a first tension clamp arm; 2220. a second tension clamping arm;

3000. geotextile.

Detailed Description

Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: there are three cases, a, B, a and B simultaneously. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural sheets" refers to two or more (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, rather than indicating or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

In the prior art, in order to realize testing of various performance parameters of geotechnical cloth, the geotechnical cloth can be tested through a chest expander, the chest expander respectively pulls two ends of the geotechnical cloth, and in the pulling process, the deformation conditions of the pulling force and the geotechnical cloth are recorded, so that various performance parameters of the geotechnical cloth are calculated.

However, the geotechnical cloth is tested through the chest expander, so that the deformation measurement of the geotechnical cloth is inaccurate in the process of pulling the geotechnical cloth. The inventor finds that the geotechnical cloth can be clamped through the extensometer, the deformation of the geotechnical cloth is measured through the extensometer, when the deformation of the geotechnical cloth is measured through the extensometer, two marking lines are often marked on a geotechnical cloth measurement sample and used for recording the initial distance of the geotechnical cloth, then after the geotechnical cloth is pulled through the chest expander, the final distance of the geotechnical cloth is recorded, the sample is not damaged or slipped, and the fact that the measurement result truly represents the real movement of the marking point is ensured.

The inventor finds that, in order to ensure that the extensometer can better clamp the geotechnical cloth, slippage is avoided in the geotechnical cloth stretching process, the contact area between the extensometer and the geotechnical cloth is often larger, the condition can cause that when the geotechnical cloth is clamped through the extensometer, the clamping part on the geotechnical cloth cannot accurately align with the initial mark point marked on the geotechnical cloth, and an error exists in calculation of the initial distance, so that inaccurate measurement of performance parameters of the geotechnical cloth is caused.

In order to solve the technical problem, according to the embodiment of the application, the clamp of the extensometer is improved, so that the contact surface between the clamping arms of the clamp is changed from original surface contact to line contact, in this way, the clamping arms can be accurately aligned with the marking lines on the geotechnical cloth, errors between the actual initial distance and the marking distance of the marking lines on the geotechnical cloth, which are caused by the fact that the clamping arms cannot be aligned with the marking lines on the geotechnical cloth, are avoided, and the accuracy of measuring each performance parameter of the geotechnical cloth is improved. Meanwhile, the shape of the contact surface between the clamping arms is changed, so that the clamping effect between the clamping arms is improved, and the relative sliding between the clamping arms and the geotechnical cloth is avoided in the process of testing the geotechnical cloth.

The extensometer and the geotextile testing system provided by the embodiment of the application can be used for testing geotextiles, and can be understood to be also used for testing elongation, tensile strength, tear strength, bursting strength and the like of any material.

Referring to fig. 1 and 2, fig. 1 shows a front view of an extensometer according to an embodiment of the present utility model, and fig. 2 shows a side view of an extensometer according to an embodiment of the present utility model, the extensometer 1000 includes: the first clamp 300, the second clamp 400, the guide rail 200, and the base 100; the guide rail 200 is vertically disposed on the base 100; the first clamp 300 and the second clamp 400 are respectively arranged on the guide rail 200 and move relatively along the guide rail 200; the first clamp 300 and the second clamp 400 each comprise a first clamping arm 411 and a second clamping arm 412, the first clamping arm 411 and the second clamping arm 412 are oppositely arranged through a tightening part 413, one side of the first clamping arm 411 opposite to the second clamping arm 412 is in an inclined plane, and when the first clamping arm 411 and the second clamping arm 412 are oppositely clamped through the tightening part 413, one side of the first clamping arm 411 is in line contact with one side of the second clamping arm 412.

As shown in fig. 1, the extensometer 1000 is in an upright state, and includes a base 100, where the base 100 is used for carrying other parts of the extensometer, and may be generally in a shape of a flat plate, and may be square or circular, so as to adapt to different application scenarios. A through hole or threaded hole is typically provided in the base to secure other components of the extensometer.

The guide rail 200 is vertically disposed on the base 100, and may be fixed to the base 100 by a screw hole, or may be disposed on the base 100 by welding. The guide rail 200 is mainly used for bearing the first clamp 300 and the second clamp 400, the guide rail can be a cylinder, the surface is smooth, and the first clamp 300 and the second clamp 400 can be sleeved on the surface of the cylinder and slide relatively along the guide rail; a sliding groove may be provided, in which the first clamp 300 and the second clamp 400 are disposed through a connection portion, and slide relatively along the sliding groove; in the embodiment of the present application, the guide rail 200 may have other shapes and structures, which are not limited herein, so long as the relative sliding of the first clamp 300 and the second clamp 400 can be facilitated.

The first clamp 300 and the second clamp 400 are clamps with the same structure, and are mainly used for clamping a test piece to be tested, such as geotechnical cloth; of course, clamps of different structures may be used as long as clamping of the test piece to be tested can be realized. In the embodiment of the present application, it is preferable that the first jig 300 and the second jig 400 are provided as members having the same structure. As shown in fig. 2, the first clamp 300 and the second clamp 400 each include a clamping arm 410, where the clamping arm 410 includes a first clamping arm 411 and a second clamping arm 412, and the first clamping arm 411 and the second clamping arm 412 are disposed opposite to each other through a tightening portion 413, for clamping a test piece to be tested.

The elastic portion 413 is used for setting the first clamping arm 411 and the second clamping arm 412 together, so that the first clamping arm 411 and the second clamping arm 412 can clamp a test piece to be tested. In order to avoid the influence of the elastic portion on the workpiece to be tested, the elastic portion 413 is generally required to be disposed at two ends of the clamping arm, and the middle portion of the clamping arm is used for clamping the workpiece to be tested.

As shown in fig. 3, the structure of the clamping arm 410 is that the clamping arm 410 has a long strip shape as a whole, and the first clamping arm 411 may have a rectangular parallelepiped structure, but may have other structures as required. The second clamping arm 412 is similar in structure to the first clamping arm 411, but in a central region thereof, a side opposite to the first clamping arm 411 is provided with a slope, by which the slope portion is in contact with the first clamping arm 411 and in line contact with a contact portion of the first clamping arm when the first clamping arm 411 and the second clamping arm 412 are clamped relatively. Through setting the contact position of the first clamping arm 411 and the second clamping arm 412 to be in line contact, when the workpiece to be tested is clamped, the marking line position arranged on the workpiece to be tested can be directly clamped, so that the actual clamping position of the first clamping arm 411 and the second clamping arm 412 on the workpiece to be tested is consistent with the marking line position arranged on the workpiece to be tested, and the error of measuring the stretching distance caused by inaccurate clamping position is avoided.

The structure of the inclined plane can be in various ways, for example: the first clamping arm 411 and the second clamping arm 412 may be directly inclined from the upper surface to the lower surface thereof such that the line contact position of the first clamping arm 411 and the second clamping arm 412 is located at the bottom of the side edge of the clamping arm; the first clamping arm 411 and the second clamping arm 412 may be located at the middle of the side edge of the clamping arm by being inclined from the upper and lower surfaces of the clamping arm to the middle position.

With continued reference to fig. 2, the first fixture 300 and the second fixture 400 may be slidably disposed on the guide rail 200 in a plurality of manners, and in this embodiment, the first fixture 300 and the second fixture 400 further include a slide 415, the slide 415 is disposed with the second clamping arm 412 through a connection portion 414, the first clamping arm 411 and the second clamping arm 412 are disposed at an end of the connection portion 414 away from the guide rail 200, the slide 415 is disposed at an end of the connection portion 414 near the guide rail 200, and the slide 415 is sleeved on the guide rail 200 and slides relative to the guide rail 200. When the slide 415 slides relatively to the guide rail 200, the slide 415 drives the first clamping arm 411 and the second clamping arm 412 to slide along the guide rail 200 together.

When a piece to be tested is tested, firstly, a mark line is arranged on the piece to be tested, and the initial distance before the test is determined; then, clamping the test piece to be tested on a clamp, enabling the clamping positions of the first clamping arm and the second clamping arm to be aligned with the clamping line on the test piece to be tested through loosening the elastic part, and then tightening the elastic part to clamp the test piece to be tested on the clamp; by pulling the test piece to be tested, the first clamp and the second clamp are driven to move relatively along with the gradual stretching of the test piece to be tested, and slide relatively on the guide rail, so that the test of the test piece to be tested is completed.

According to the embodiment of the application, the clamp of the extensometer is improved, the contact surface between the clamping arms of the clamp is changed from original surface contact to line contact, in this way, the clamping arms can be accurately aligned with the marking lines on the geotechnical cloth, errors between the actual initial distance and the marking distance of the marking lines on the geotechnical cloth, which are caused by the fact that the clamping arms cannot be aligned with the marking lines on the geotechnical cloth, are avoided, and the accuracy of measuring various performance parameters of the geotechnical cloth is improved.

In order to avoid that the clamping arm cannot be aligned with the clamping line on the test piece to be tested due to deformation of the test piece to be tested in the stretching process of the test piece to be tested, in the embodiment of the present application, the cross section of the line contact part between one side of the first clamping arm 411 and one side of the second clamping arm 412 is set to be wavy.

Fig. 4 is a top view of a line contact portion of the clamping arm 410, and a cross section of a line contact portion of one side of the first clamping arm 411 and one side of the second clamping arm 412 is in a wave shape, so that a contact area between the clamping arm and a test piece to be tested is increased by setting the cross section into a wave shape, a clamping effect on the test piece to be tested can be better achieved, and a problem that a mark line on the clamping arm and the test piece to be tested cannot be aligned due to deformation of the test piece to be tested in a stretching process of the test piece to be tested is avoided. And the wave-shaped structure can not influence the structure of the test piece to be tested and the test effect of the test piece to be tested.

In order to facilitate the first clamping arm 411 and the second clamping arm 412 to clamp a piece to be tested, the setting of the elastic portion needs to be more convenient to use, and the elastic portion can be set to be in a threaded structure or a clamping structure in the embodiment of the application, so that the piece to be tested can be clamped and loosened conveniently and rapidly.

As shown in fig. 3, the elastic portion 413 has a bolt structure, and screw holes are provided at both ends of the first clamping arm 411 and the second clamping arm 412, respectively, and the first clamping arm 411 and the second clamping arm 412 are provided together by twisting the bolts.

Of course, a clamping structure may be adopted, and by providing clamping portions at both ends of the first clamping arm 411 and the second clamping arm 412, the first clamping arm 411 and the second clamping arm 412 can be conveniently operated.

In order to conveniently locate the initial distance of the test piece to be tested, in the embodiment of the present application, the first fixture 300 is movably disposed on the guide rail 200 through the first connection portion; the second clamp 400 is movably arranged on the guide rail 200 through a second connecting part; the position of the first connecting portion opposite to the second connecting portion is provided with a measuring column 420 in a penetrating manner, and the measuring column 420 is used for abutting against the second connecting portion to determine the minimum distance between the first clamp 300 and the second clamp 400.

As shown in fig. 2, the measuring column 420 is movably disposed at the connection portion 414 and can move up and down with respect to the connection portion, and a scale is provided on the measuring column 420 for defining a distance between the first and second jigs. Assuming that the initial distance between the clamping lines on the surface of the test piece to be tested is 5 cm, the difference between the distance between the clamping positions of the first clamping arm and the second clamping arm and the distance between the measuring column is 1 cm, the length of the measuring column between the first clamp and the second clamp can be set to be 6 cm, that is to say, the minimum distance between the first clamp and the second clamp is 6 cm, and the test piece to be tested can be conveniently positioned by setting the measuring column 420.

For better fixing the guide rail 200, in the embodiment of the present application, the extensometer further includes a fixing post 500; the fixing column 500 is parallel to the guide rail 200, one end of the fixing column 500 is disposed on the base 100, and the other end of the fixing column 500 is fixedly connected with the guide rail 200, so as to fix the guide rail 200 on the base 100.

As shown in fig. 2, the fixing columns 500 are disposed parallel to the guide rail 200 and are disposed on the base 100 vertically, and the fixing columns 500 may be cylindrical or rectangular, and are mainly used for reinforcing the guide rail. The connecting plate is arranged at the tops of the fixing column 500 and the guide rail 200, the fixing column 500 and the guide rail 200 are arranged together, the connecting strength of the guide rail is increased, and the guide rail is prevented from shaking or being damaged in the process of testing a piece to be tested.

In order to better enable the first fixture 300 and the second fixture 400 to relatively move along the guide rail 200, in the embodiment of the present application, the extensometer is further provided with a roller 600, specifically including a first roller 610 and a second roller 620, where the first roller 610 and the second roller 620 are respectively located at one end of the guide rail 200 away from the base 100; the first roller 610 is connected to the first fixture 300 through a traction rope 630, and the second roller 620 is connected to the second fixture 400 through a traction rope 630, so as to drive the first fixture 300 and the second fixture 400 to slide along the guide rail 200, respectively.

With continued reference to fig. 2, a roller 600 is disposed at the top of the guide rail, a first roller 610 is correspondingly connected with the first fixture 300, a second roller 620 is correspondingly connected with the second fixture 400, a traction rope 630 is wound on the surface of the roller, and the first fixture and the second fixture can conveniently move along the guide rail by disposing the roller, so that the difficulty in moving the fixtures is greatly reduced.

In order to accurately measure the moving distance of the first and second jigs, the extensometer further includes a photoelectric encoder (not shown) connected to the first and second rollers 610 and 620 for measuring the moving distance of the first and second jigs 300 and 400. The moving distance of the first fixture 300 and the second fixture 400 can be accurately obtained by measuring the rotating distance of the first roller and the second roller of the photoelectric encoder, and meanwhile, the volume of the extensometer is reduced because the photoelectric encoder is generally integrally arranged with the rollers.

The embodiment of the application also provides a geotechnical cloth testing system, as shown in fig. 5, which comprises a chest expander 2000, a controller (not shown) and the extensometer 1000 in the above embodiment; the chest expander 2000 includes a first tension clamp 2100, a second tension clamp 2200, and a tension sensor (not shown), wherein the first tension clamp 2100 and the second tension clamp 2200 are movably disposed with respect to each other, and the tension sensor is used for measuring tension between the first tension clamp 2100 and the second tension clamp 2200; the first and second clamps 300 and 400 are positioned between the first and second tension clamps 2100 and 2200; the first clamp 300 and the second clamp 400 are used for clamping at the testing position of the test piece 3000 to be tested, and the first tensile clamp 2100 and the second tensile clamp 2200 are used for clamping at two ends of the test piece 3000 to be tested respectively; when the first tensile fixture 2100 and the second tensile fixture 2200 pull the test piece 3000 to be tested, the first fixture 300 and the second fixture 400 are driven to move relatively; the controller is electrically connected with the tension sensor and the photoelectric encoder, respectively, and is configured to receive a tension value between the first tension clamp 2100 and the second tension clamp 2200 and a movement distance between the first clamp 300 and the second clamp 400, and to test the geotechnical cloth according to the tension value and the movement distance.

As shown in fig. 5, the chest expander 2000 includes a first tension clamp 2100 and a second tension clamp 2200, where the first tension clamp 2100 and the second tension clamp 2200 are disposed opposite to each other and can move relatively, and the chest expander is mainly used for pulling and deforming the geotextile after clamping the geotextile. When in use, the chest expander 2000 is matched with the extensometer 1000, and after the clamping arms on the extensometer complete clamping the geotechnical cloth, the first tension clamp 2100 and the second tension clamp 2200 respectively clamp the two ends of the geotechnical cloth. Then, the first tension clamp 2100 and the second tension clamp 2200 move relatively, as shown in fig. 5, if the first tension clamp 2100 is disposed on the base, the second tension clamp 2200 can be kept moving, which pulls the geotechnical cloth 3000 to deform, and the geotechnical cloth deforms to drive the first clamp and the second clamp to move. Because the tension device 2000 is provided with the tension sensor, and the extensometer is provided with the photoelectric encoder, the tension sensor can be used for measuring the tension of the geotechnical cloth pulled by the tension device 2000 to obtain the tension value between the first tension clamp 2100 and the second tension clamp 2200; and measuring a displacement value between the first clamp and the second clamp through the photoelectric encoder to obtain a deformation value of the geotechnical cloth.

The controller is disposed on the measuring terminal, and may be a separate computer, or a dedicated measuring terminal, which is not limited herein. The controller is electrically connected with the tension sensor and the photoelectric encoder, and can measure various performance indexes of the geotechnical cloth after the tension value and the displacement value are obtained.

According to the geotechnical cloth performance testing method and device, the geotechnical cloth performance testing can be completed more accurately, the measuring error can be reduced to the greatest extent, and the measuring accuracy is improved.

For better clamping the two ends of the geotextile, in the embodiment of the present application, the first tension clamp and the second tension clamp each include a first tension clamp arm 2210 and a second tension clamp arm 2220; the first tension clamping arm 2210 and the second tension clamping arm 2220 are movably arranged relatively, and are used for clamping the test piece 3000 to be tested. The main function of the first tension clamping arm 2210 and the second tension clamping arm 2220 is to clamp two ends of geotechnical cloth, so that falling-off in the process of stretching the geotechnical cloth is avoided, and test failure is caused.

In order to enable the first tension clamping arm 2210 and the second tension clamping arm 2220 to clamp the geotechnical cloth more firmly, the abutting surfaces of the first tension clamping arm 2210 and the second tension clamping arm 2220 are wavy or zigzag.

As shown in fig. 6, the contact between the first tension clamping arm 2210 and the second tension clamping arm 2220 is in a wave shape, and by the wave shape design, the contact area between the clamping arm and the geotechnical cloth can be increased, so that the friction force between the geotechnical cloth and the clamping arm can be increased.

As shown in fig. 7, the contact surface between the first tension clamping arm 2210 and the second tension clamping arm 2220 is in a zigzag shape, and through the zigzag design, on one hand, the contact area between the clamping arm and the geotechnical cloth can be increased, and on the other hand, the zigzag design can enable the contact between the clamping arm and the geotechnical cloth to be firmer, so that a better fixing effect is achieved.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (10)

1. An extensometer, comprising: the device comprises a first clamp, a second clamp, a guide rail and a base;

the guide rail is vertically arranged on the base;

the first clamp and the second clamp are respectively arranged on the guide rail and move relatively along the guide rail;

the first clamp and the second clamp comprise a first clamping arm and a second clamping arm, the first clamping arm and the second clamping arm are oppositely arranged through an elastic part, one side of the first clamping arm opposite to the second clamping arm is in inclined surface arrangement, and when the first clamping arm and the second clamping arm are oppositely clamped through the elastic part, one side of the first clamping arm is in line contact with one side of the second clamping arm.

2. The extensometer of claim 1 wherein a cross-section of the line contact of the first clamp arm side and the second clamp arm side is wavy.

3. The extensometer of claim 1 wherein the slack is a threaded or snap-fit structure.

4. The extensometer of claim 1 wherein the first clamp is movably disposed on the rail by a first connection; the second clamp is movably arranged on the guide rail through a second connecting part;

and a measuring column is arranged on the first connecting part in a penetrating manner at a position opposite to the second connecting part, and is used for abutting against the second connecting part to determine the minimum distance between the first clamp and the second clamp.

5. The extensometer of claim 1 further including a fixed post;

the fixed column with guide rail parallel arrangement, fixed column one end set up in on the base, the fixed column other end with guide rail fixed connection is used for with the guide rail is fixed on the base.

6. The extensometer of any one of claims 1-5 wherein the extensometer includes a first roller and a second roller, the first roller and the second roller being located at an end of the rail away from the base, respectively;

the first roller is connected with the first clamp through a traction rope, and the second roller is connected with the second clamp through a traction rope and is used for driving the first clamp and the second clamp to slide along the guide rail respectively.

7. The extensometer of claim 6 further including a photoelectric encoder coupled to the first and second rollers for measuring a distance traveled by the first and second clamps.

8. The geotechnical cloth test system is characterized in that: comprising a chest expander, a controller and an extensometer as claimed in claim 7;

the chest expander comprises a first tension clamp, a second tension clamp and a tension sensor, wherein the first tension clamp and the second tension clamp are arranged in a relatively movable manner, and the tension sensor is used for measuring tension between the first tension clamp and the second tension clamp; the first clamp and the second clamp are positioned between the first tension clamp and the second tension clamp;

the first clamp and the second clamp are used for clamping the test position of the test piece to be tested, and the first tension clamp and the second tension clamp are used for respectively clamping the two ends of the test piece to be tested;

when the first tension clamp and the second tension clamp pull the test piece to be tested, the first clamp and the second clamp are driven to move relatively;

the controller is electrically connected with the tension sensor and the photoelectric encoder respectively and is used for receiving a tension value between the first tension clamp and the second tension clamp and a movement distance between the first clamp and the second clamp, and testing the geotechnical cloth according to the tension value and the movement distance.

9. The geotextile testing system of claim 8, wherein the first tension clamp and the second tension clamp each comprise a first tension clamp arm and a second tension clamp arm;

the first tension clamping arm and the second tension clamping arm are arranged in a relatively movable mode and used for clamping the test piece to be tested.

10. The geotextile testing system of claim 9, wherein the abutment of the first tension clamp arm and the second tension clamp arm is wavy or serrated.