CN209429098U - A three-dimensional earth pressure cell with a flat base - Google Patents

Abstract

The utility model provides a kind of three-dimensional soil pressure cell with flat base, which is cut into small one and large one two planes using granatohedron as basic structure on granatohedron.X, y-coordinate axis wherein are had as soil pressure cell base top surface compared with facet, and biggish plane is as soil pressure cell base bottom surface.The soil pressure cell is for the soil body in geotechnical engineering or the test of other materials internal stress, and for the utility model compared with traditional three-dimensional soil pressure cell, bottom has flat base, therefore can greatly improve the placement stablizing effect of test device.Meanwhile the top surface of the utility model comes with x, y-coordinate axis, is put into the soil body or material internal, is convenient for precise positioning, guarantees the accuracy of test result.

Description

A three-dimensional earth pressure cell with a flat base

technical field

The utility model belongs to the field of conventional stress testing and is suitable for geotechnical engineering, in particular to a three-dimensional earth pressure cell with a plane base.

Background technique

The earth pressure measuring device is an important equipment for performing geotechnical tests and determining the mechanical parameters of soil. In engineering, the earth pressure testing device is usually placed inside the soil or other materials to determine the stress distribution by detecting the pressure it is subjected to.

At present, earth pressure cells conventionally used to test the stress state of soil are often used in the following occasions: the test of the surface pressure of rigid structures is often buried in the grooves of the structure; the pressure test of rigid foundations is often buried in the surface of the structure; Field stress tests are often buried in the medium. When the base moves or rotates after the earth pressure cell is placed, the stress at the desired point cannot be accurately measured. Obviously, the buried quality of the earth pressure box base will directly affect the accuracy of the measurement results, and there are many examples of test failures due to improper burial.

The above problems make increasing the stability of the earth pressure cell base an urgent problem to be solved. There is an urgent need for a three-dimensional earth pressure cell that is easy to place and more stable after placement, so as to increase the accuracy of stress measurement.

SUMMARY OF THE INVENTION

The purpose of the utility model is to provide a measuring device for accurately measuring the internal stress of soil and other materials, which can accurately measure the stress state of the required point.

In order to achieve the above purpose, the technical solution adopted by the present invention is a three-dimensional earth pressure cell with a plane base, the three-dimensional earth pressure cell includes two parts: a base and a conventional earth pressure cell, and the base has a belt with x, The top surface of the y-coordinate axis and a larger plane are used as the bottom surface of the support, and the other surfaces have grooves; the top surface is a square with a side length of 20mm; the bottom surface is a square with a side length of 45mm; The fourth, fifth, sixth, tenth, eleventh, thirteenth, and fourteenth surfaces are respectively cut out grooves A, and the groove A is centered on the centroid of each surface , with a radius of 15mm and a height of 5mm to cut out the part after the cylinder; on the seventh, eighth, ninth, and twelfth faces, cut out grooves B respectively, and the grooves B are Take the centroid of each face as the center, take 7mm as the radius and 20mm as the height to cut out the part after the cylinder; cut out the groove C on the top surface 1, and the groove C is based on the centroid of the face 1. The center, with a radius of 6mm and a height of 5mm, cut out the part after the cylinder; the first and second sides, the third and ninth sides, the fourth and tenth sides, and the fifth and The eleventh side 11, the sixth side and the twelfth side, the seventh side and the thirteenth side, the eighth side and the fourteenth side are respectively parallel; the earth pressure box and the groove are cemented into one; The wire can be passed through the groove; the spirit level can be combined with the groove C, which is convenient for keeping the earth pressure box horizontal.

The beneficial effects of the utility model are as follows: the device has distinctive features such as reasonable structure, easy operation, and more stability, and can be widely used in engineering.

Description of drawings

1 is a schematic structural diagram of a three-dimensional earth pressure cell with a plane base of the present invention;

Fig. 2 is the schematic front view of Fig. 1;

Fig. 3 is the side view schematic diagram of Fig. 1;

FIG. 4 is a schematic top view of FIG. 1 .

In the picture:

1. Top 2. Bottom 3-14. Side

A groove B groove C groove

Detailed ways

A three-dimensional earth pressure cell structure with a plane base provided by the present invention will be described with reference to the accompanying drawings.

The utility model provides a design principle of a three-dimensional earth pressure cell with a plane base: the invention focuses on the stability of the three-dimensional earth pressure cell and solves it by increasing the area of the bottom surface of the base of the earth pressure cell. The three-dimensional earth pressure cell with a flat base is composed of a base and a conventional earth pressure cell. The top surface 1 of the base has its own x and y coordinate axes, which is convenient for accurate positioning in the actual application process. The bottom surface 2 with a larger area is used as the bottom surface of the base, so the stability of the test device can be greatly improved.

As shown in Figures 1 to 4, a three-dimensional earth pressure cell with a flat base is placed into the soil body or other materials to be tested and connected with the stress acquisition system. The device includes a base and a conventional earth pressure cell. The base has a top surface 1 with x and y coordinate axes, a larger flat surface as a bottom surface 2 for support, and the other surfaces have grooves; the top surface 1 is a square with a side length of 20mm; the bottom surface 2 is a side of 45mm. Long square; cut on the third side 3, the fourth side 4, the fifth side 5, the sixth side 6, the tenth side 10, the eleventh side 11, the thirteenth side 13, and the fourteenth side 14 respectively Out of groove A. The A grooves are arranged on the third surface 3, the fourth surface 4, the fifth surface 5, the sixth surface 6, the tenth surface 10, the eleventh surface 11, the thirteenth surface 13 and the fourteenth surface 14 Above, the part after the cylinder is cut out at the base with the centroid of each face as the center, 15mm as the radius and 5mm as the height; on the seventh face 7, the eighth face 8, the ninth face 9, Grooves B are cut out on the twelve faces 12 respectively. The groove B is arranged on the seventh surface 7, the eighth surface 8, the ninth surface 9, and the twelfth surface 12, with the centroid of each surface as the center, 7mm as the radius, and 20mm as the height. The part after the cylinder is cut out on the seat; the groove C is cut out on the top surface 1. The groove C is the part after the centroid of the surface 1 is the center, the radius is 6 mm, and the height is 5 mm after cutting out the cylinder; the first surface 1 and the second surface 2, the third surface 3 and The ninth side 9, the fourth side 4 and the tenth side 10, the fifth side 5 and the eleventh side 11, the sixth side 6 and the twelfth side 12, the seventh side 7 and the thirteenth side 13, the eighth side The surface 8 and the fourteenth surface 14 are respectively parallel; the earth pressure box and the groove are cemented into one; the wire of the earth pressure box can pass through the groove; the level can be combined with the groove C, which is convenient to keep the earth pressure box when it is placed. Level.

The three-dimensional earth pressure cell with a plane base provided by the utility model can effectively reduce the measurement error caused by the movement or rotation of the base in practical application, obtain the measurement results of the required points more accurately, and determine the corresponding stress state , to provide technical support for stress measurement.

Claims (10)

1. A three-dimensional earth pressure cell with a plane base, the three-dimensional earth pressure cell comprising a base, an earth pressure cell, characterized in that: the base comprises a top surface (1), a supporting bottom surface (2) and several On the side surfaces, grooves for placing earth pressure cells are arranged on the several side surfaces, and the top surface (1) is parallel to the bottom surface (2). 2. A three-dimensional earth pressure cell with a plane base according to claim 1, characterized in that: the top surface (1) is a small square and is set as x, y coordinate axes with side length, and the bottom surface (1) is a small square. 2) is a large square larger than the top surface. 3 . The three-dimensional earth pressure cell with a plane base according to claim 2 , wherein the side length of the small square is 20 mm, and the side length of the large square is 45 mm. 4 . 4 . The three-dimensional earth pressure cell with a plane base according to claim 1 , wherein the several side surfaces are provided with an A groove, a B groove or a C groove. 5 . 5. The three-dimensional earth pressure cell with a plane base according to claim 4, wherein the A groove is arranged on the third surface (3), the fourth surface (4), and the fifth surface (5). ), the sixth surface (6), the tenth surface (10), the eleventh surface (11), the thirteenth surface (13) and the fourteenth surface (14), the A grooves are each The centroid of the surface is the center, the radius is 15mm, and the height is 5mm when the cylinder is cut out at the base. 6. A three-dimensional earth pressure cell with a plane base according to claim 4, characterized in that: the B grooves are arranged on the seventh surface (7), the eighth surface (8), and the ninth surface (9). ), and on the twelfth face (12), the B groove is the part after the cylinder is cut out on the base with the centroid of each face as the center, the radius of 7mm, and the height of 20mm. 7. A three-dimensional earth pressure cell with a plane base according to claim 4, characterized in that: the C groove is arranged on the top surface (1) and is centered on the centroid of the surface (1), The part after the cylinder is cut out on the base with a radius of 6mm and a height of 5mm. 8. A three-dimensional earth pressure cell with a plane base according to claim 5 or 6, characterized in that: the third surface (3) and the ninth surface (9), the fourth surface (4) and the tenth surface (10), the fifth side (5) and the eleventh side (11), the sixth side (6) and the twelfth side (12), the seventh side (7), the third side (13), the eighth side (8) ) and the fourteenth face (14) are parallel, respectively. 9 . The three-dimensional earth pressure cell with a plane base according to claim 4 , wherein a spirit level is set in the C groove. 10 . 10. A three-dimensional earth pressure cell with a plane base according to claim 1, characterized in that: the earth pressure cell and the groove are cemented into one body, and the wires of the earth pressure cell pass through the respective holes and connect to the inside of the base. 11 . The through holes of the wires converge at the bottom of the base and go out.