CN219434558U

CN219434558U - Portable field rock flexural tensile strength tester

Info

Publication number: CN219434558U
Application number: CN202320313271.7U
Authority: CN
Inventors: 王礼根; 许文斌; 吕蒙; 顾德海
Original assignee: Anhui Traffic Survey And Design Institute Co ltd
Current assignee: Anhui Traffic Survey And Design Institute Co ltd
Priority date: 2023-02-25
Filing date: 2023-02-25
Publication date: 2023-07-28
Anticipated expiration: 2033-02-25

Abstract

The utility model discloses a portable field rock bending tensile strength tester, which comprises a fixed plate, wherein the fixed plate is fixed on a base, the front surface of the fixed plate is connected with a movable plate through a fixed bolt, a test piece is fixed between the fixed plate and the movable plate through rotating a nut on the fixed bolt, a limiter is respectively fixed on the same side surface of the fixed plate and the movable plate, a limit bolt is arranged in the limiter, the test piece limit plate is placed on the test piece, and the limit bolt is propped against the test piece limit plate; the base is also provided with a hand-operated horizontal jack with a pressure gauge, and the hand-operated horizontal jack is arranged below the test piece. The test instrument has the characteristics of portability and can perform field measurement; the hardness degree of the rock is judged by adopting the quantitative index, so that the interference of human factors is avoided, and the judgment error is reduced.

Description

Portable field rock flexural tensile strength tester

Technical field:

the utility model relates to the field of measuring instruments, in particular to a portable field rock flexural tensile strength tester.

The background technology is as follows:

the existence of the rock slope is unavoidable in the mountain road, the setting of the rock slope rate in the design process is related to the rock grade, the determination of the rock grade is mainly dependent on the hardness degree and the integrity of the rock, and the rock grade is corrected by groundwater, the stress in the rock and the like. The slope rate of the rock slope is generally preliminarily calculated through on-site stepping; the integrity index of the rock mass can be obtained through measurement; the hardness degree of the rock is mainly determined by knocking the rock body through a geological hammer and through sound and touch, and the rock is qualitatively judged, so that the rock is more in human factors and larger in errors. If the core is taken and then an indoor test is carried out, the on-site discrimination is not facilitated, and the workload is large.

The utility model comprises the following steps:

the utility model provides a portable on-site rock flexural tensile strength measuring device aiming at the defects of the prior art.

The technical problems to be solved by the utility model are realized by adopting the following technical scheme:

the portable field rock flexural tensile strength tester comprises a fixed plate, wherein the fixed plate is fixed on a base, the front surface of the fixed plate is connected with a movable plate through a fixed bolt, a test piece is fixed between the fixed plate and the movable plate through rotating a nut on the fixed bolt, a limiter is respectively fixed on the same side surface of the fixed plate and the same side surface of the movable plate, a limit bolt is arranged in the limiter, the test piece limit plate is placed on the test piece, and the limit bolt is propped against the test piece limit plate;

the base is also provided with a hand-operated horizontal jack with a pressure gauge, and the hand-operated horizontal jack is arranged below the test piece.

The utility model further discloses the following technology:

preferably, the limiter is a rotatable movable limiter which is inserted on the fixed plate and the movable plate through a rotating rod.

Preferably, the horizontal distance between the action point of the hand-operated horizontal jack and the limiter is more than 5 times of the height of the test piece.

Preferably, the magnitude of the applied concentrated force can be calculated through a pressure gauge on the hand-operated horizontal jack; and (3) inserting the broken test piece into a measuring cylinder with an overflow pipe, measuring the depth of the test piece inserted into water and the volume of the overflow water, and calculating to obtain the cross-sectional area, wherein the rock bending tensile strength is calculated according to the following formula:

P＝CR

c, instrument calibration coefficient, which is the piston area of the jack

R-oil pressure gauge reading

P-breaking load, i.e. concentrating force

L-horizontal distance from test piece breaking surface to jack center

W-flexural section modulus, which can be converted from the shape of the test piece

Sigma-flexural tensile Strength

A-cross-sectional area

V-volume of overflow tube effluent

h-depth of time of insertion into water.

Compared with the prior art, the utility model has the beneficial effects that:

the test instrument has the characteristics of portability and can perform field measurement;

the hardness degree of the rock is judged by adopting quantitative indexes, so that the interference of human factors is avoided, and the judgment error is reduced;

the rock compressive strength is big, and outdoor detection degree of difficulty is big, and flexural strength is less relatively, and flexural strength has the proportional relation with compressive strength. And the flexural tensile strength is used as a test index, so that the test difficulty is low.

The test result can be used as the basis of dangerous rock support design. Dangerous rock is caused by tensile failure, and flexural strength is a main calculation parameter.

The requirements on the shape and the like of the rock mass sample are low, secondary deep processing is not needed, the acquisition of the test piece is convenient, and the test is convenient.

Description of the drawings:

in order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings needed in the description of the embodiments will be briefly described below, it will be apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art;

fig. 1 is a device diagram (front view);

FIG. 2 is a side view of the device;

FIG. 3 is a schematic diagram of test piece area measurement;

the symbols in the figure are: 1-base, 2-fixed plate, 3-fixed bolt, 4-movable limiter, 5-test piece limiting plate, 6-limiting bolt, 7-rock test piece, 8-jack, 9-movable plate and 10-measuring cylinder with overflow pipe.

The specific embodiment is as follows:

the utility model is further described with reference to the following detailed drawings in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the implementation of the utility model easy to understand.

Example 1:

the device has the basic structure that:

the fixed plate 2 is fixed on the base 1, four fixed bolts 3 (movable nuts are arranged on the bolts) are fixed on the front surface of the fixed plate 2, the movable plate 9 is connected with the fixed plate 2 through the fixed bolts 3, and the test piece 7 can be fixed between the fixed plate 2 and the movable plate 9 by rotating the nuts on the fixed bolts 3; the side surfaces of the fixed plate 2 and the movable plate 9 are respectively fixed with a rotatable movable limiter 4, and the movable limiter 4 can only rotate and can not move up and down and left and right; the movable limiter 4 is internally provided with the limit bolt 6, the test piece limit plate 5 is placed on the test piece 7, the limit function of the test piece limit plate 5 is realized through the limit bolt 6 in the movable limiter 4, so that the movable limiter 4 can rotate, the limit bolt 6 can vertically prop against the test piece limit plate 5 by adjusting the angle of the movable limiter 4 because of the uneven surface of the test piece, and the test piece limit plate 5 can also ensure that the fracture surface of the rock mass is in the range of the test piece limit plate 5; the base 1 is also provided with a hand-operated horizontal jack 8 with a pressure gauge; the crank of the jack 8 is rocked, so that a concentrated force can be applied to a test piece, and the magnitude of the applied concentrated force can be calculated through the pressure gauge on the jack 8; the broken test piece 7 is inserted into a measuring cylinder 10 with an overflow pipe, the depth of the test piece 7 inserted into water and the volume of the overflow water are measured, the cross-sectional area is calculated, and the rock bending tensile strength is calculated according to the following formula:

P＝CR

c, instrument calibration coefficient, which is the piston area of the jack

R-oil pressure gauge reading

P-breaking load, i.e. concentrating force

L-horizontal distance from test piece breaking surface to jack center

Sigma-flexural tensile Strength

A-cross-sectional area

V-volume of overflow tube effluent

h-depth of time of insertion into water.

Working principle:

the test piece is horizontally placed among the four fixing bolts of the fixing plate, the fixing bolts are rotated in an equalizing mode, the movable plate and the fixing plate fix the test piece, and the movable plate and the fixing plate are horizontal as much as possible; installing a movable limiter and a test piece limiting plate, rotating the movable limiter, selecting a proper angle, and rotating a limiting bolt to thoroughly fix the test piece to form fixed constraint; selecting a proper position (the horizontal distance between a jack action point and a limiter is more than 5 times of the height of a test piece), and installing a hand-operated horizontal jack with a pressure gauge; shaking a jack handle at a constant speed, applying concentrated force, recording jack pressure when a test piece breaks, and measuring the horizontal distance between a breaking surface and the jack; the broken test piece is inserted into a measuring cylinder with an overflow pipe for one section, and the volume of overflowed water is recorded. And calculating the flexural tensile strength of the test piece through the parameters.

Test procedure:

1. selecting proper test piece (strip shape)

2. The mounting instrument is horizontally arranged among the four fixing bolts of the fixing plate, and the fixing bolts are rotated in an equalizing manner;

3. installing a limiter, a test piece limiting plate and components thereof, and fixing a test piece;

4. installing a jack;

5. shaking the handle, applying a concentrated force, and recording the breaking pressure;

6. measuring the horizontal distance between the fracture surface and the jack;

7. inserting a section of the fracture test piece into a measuring cylinder with an overflow pipe, and recording the volume of overflowed water;

8. and calculating the flexural tensile strength.

It should be noted that in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing has shown and described the basic principles and main features of the present utility model and the advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A portable on-site rock flexural tensile strength tester is characterized in that: the test piece fixing device comprises a fixing plate, wherein the fixing plate is fixed on a base, the front surface of the fixing plate is connected with a movable plate through a fixing bolt, a test piece is fixed between the fixing plate and the movable plate through rotating a nut on the fixing bolt, a limiter is respectively fixed on the same side surface of the fixing plate and the same side surface of the movable plate, a limit bolt is arranged in the limiter, the test piece limit plate is placed on the test piece, and the limit bolt is propped against the test piece limit plate;

2. A portable in-situ rock flexural tensile strength tester as claimed in claim 1 wherein: the limiter is a rotatable movable limiter which is inserted on the fixed plate and the movable plate through the rotating rod.

3. A portable in-situ rock flexural tensile strength tester as claimed in claim 1 wherein: the horizontal distance between the action point of the hand-operated horizontal jack and the limiter is more than 5 times of the height of the test piece.