CN210742086U - Improved shearing box for friction test - Google Patents
Improved shearing box for friction test Download PDFInfo
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- CN210742086U CN210742086U CN201920585095.6U CN201920585095U CN210742086U CN 210742086 U CN210742086 U CN 210742086U CN 201920585095 U CN201920585095 U CN 201920585095U CN 210742086 U CN210742086 U CN 210742086U
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Abstract
The utility model discloses a box is cuted to improved generation for friction test, static, the dynamic friction coefficient between this shearing box testable soil sample and the different materials, for the sliding friction of simulation pile foundation, push pipe and shield structure blade disc and different soil bodies, the shearing box of a dedicated test soil sample and different material frictional forces such as concrete, steel has been improved in the design. By adopting the novel shearing box, the sliding friction test of different soil bodies and different materials under different vertical pressures is carried out on a large direct shear apparatus, the friction force existing between the upper box and the lower box can be effectively eliminated, so that a soil sample is in close contact with a test material, the vertical pressure can be applied, the shearing speed is artificially controlled, and the measurement of the friction force between the soil and different materials (such as piles, jacking pipes and shield cutter heads) under different pressure conditions is effectively completed.
Description
Technical Field
The utility model belongs to geotechnique's test instrument device field relates to an improved generation shearing box for friction test.
Background
The direct shear apparatus is a conventional apparatus for geotechnical tests, and is characterized in that a soil sample is placed in a shear box capable of moving up and down in a staggered manner, after vertical pressure is applied, the lower box is pushed to drive the upper box to measure the shear strength of the soil sample, and the shear strength parameters of the soil are calculated. The dynamic friction coefficient of the contact surface of the static pressure pile, the jacking pipe and the shield cutter head with the soil body in the construction process is an important parameter for calculating static pressure, jacking pipe counter force and shield cutter head friction torque. At present, the test of the coefficient of dynamic friction is mostly carried out through a sliding plate test, a sample slides and rubs under the dead weight, the friction coefficient is determined through the angle of the sliding plate, the pressure vertical to a sliding surface cannot be applied, and meanwhile, the angle of the sliding plate is not easy to determine; the test result of the model test is accurate, but the test is time-consuming and labor-consuming and has higher cost. Some improvements are used for friction test's shearing box, and upper and lower box is rigid contact, and frictional force is big and unstable, and soil sample and material module can not fully contact, need improve so that carry out more accurate friction test measurement, provide more accurate geotechnological parameter for static pressure stake, push pipe and shield structure construction etc..
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a through improving the shearing box, can effectively reduce the frictional force between upper and lower box, compaction soil sample and material contact utilize the staight scissors appearance, and convenient, the stable friction under different pressure between different materials of swiftly test and the soil body, and then calculate out dynamic friction coefficient.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
the utility model provides a box is cuted to improved generation for friction test, includes box (1) and last box (2) down, its characterized in that box (1) includes first cell body (3), impels axle bed (4), base (5) and rubber strip (6) down, impel axle bed (4) and weld into whole with first cell body (3) lateral wall, weld into whole at the bottom of base (5) and first cell body (3), rubber strip (6) are connected into whole with first cell body (3) embedded solid. The upper box (2) comprises a shaft seat (7), a pressurizing cap (8) and a second groove body (9), and the shaft seat (7), the pressurizing cap (8) and the second groove body (9) are welded into a whole.
The first groove body (3) is a square groove body, the thickness of the groove wall is 10mm, the length and the width of the outer side of the first groove body are 170mm x 60mm, and the inner side of the first groove body is 150mm x 50 mm; the center of the upper part of the groove wall is provided with a round hole with the diameter of 7mm and the axial size of 160mm x 160 mm; the circle center is positioned at the position that the thickness center of the groove wall is 2.5mm lower than the top of the groove wall.
The cross section of the rubber strip (6) is circular, the diameter is 7mm, the plane shape is square, and the axial size is 160 mm-160 mm;
the second groove body (9) is a cuboid, the wall thickness is 10mm, the length and width of the external dimension is 270mm x 190mm x 30mm, and the size of the internal groove is 250mm x 170mm x 20 mm;
preferably, the diameter of the rubber strip (6) is consistent with the diameter of the opening of the groove wall of the lower box (1), and the size of the axle center is consistent with that of the opening of the groove wall.
Preferably, the thickness of the groove wall of the first groove body (3) is consistent with that of the groove wall of the second groove body (9), and the width of the inner groove of the second groove body (9) is consistent with that of the outer wall of the first groove body (3).
The center of the preferable propulsion shaft seat (4) coincides with the center of the outer wall of the first groove body (3), the center of the pressurization shaft seat (7) coincides with the center of the upper surface of the second groove body (9), and the center of the shaft seat (8) coincides with the center of the outer wall of the second groove body (9) in the width direction.
The size of the lower bottom of the base (5) is preferably consistent with that of the lower bottom of the first groove body (3), the width of the axle center of the slideway is consistent with that of the axle center of the slideway of the direct shear apparatus, and the direction of the slideway is parallel to the direction of the propulsion axle seat (4).
The preferable push shaft seat (4) groove is matched with the push rod ball point, the shaft seat (7) groove is matched with the dynamometer ball point, and the pressurizing cap (8) groove is matched with the pressurizing ball point.
The length and width of the preferable material plate are consistent with the size of the inner wall of the second groove body (9), and the height of the preferable material plate is 5mm higher than the inner wall of the second groove body (9).
Compared with the prior art, the utility model discloses an advantage lies in with beneficial effect:
1. the lower box has large size, and can test the friction coefficients of fine-grained soil, coarse-grained soil and different materials.
2. The openings of the round holes on the upper parts of the four walls of the lower box are smaller than the diameter of the rubber strip, so that the rubber strip can be embedded and fixed on the upper part of the wall of the lower box, and the positions of the rubber strips can not change in the mutual dislocation process of the upper box and the lower box.
3. The rubber strip has certain elasticity, and the height diminishes under the effect of last box pressure, can the compaction soil sample, makes soil sample and test material in close contact with.
4. The rubber strip separates the test material from the lower box, the direct contact and friction between the test material and the lower box are avoided, the friction force between the rubber strip and the material can be measured before a soil sample is not loaded, and the friction force is stable.
5. The upper box is large in size, the friction displacement of materials and soil samples is large, and the friction force under different working conditions can be tested through speed adjustment.
6. The friction material can be selected at will, and the contact surface of the material and the soil sample can be made into different roughness for testing.
Drawings
FIG. 1 is a side view of the upper box of the shear box of the present invention;
FIG. 2 is a top view of the upper box of the shear box of the present invention;
FIG. 3 is a front view of the lower box of the shear box of the present invention;
FIG. 4 is a rear view of the lower box of the shear box of the present invention;
FIG. 5 is a top view of the lower box of the shear box of the present invention;
FIG. 6 is a schematic view of the shear box of the present invention in use;
in the figure: 1. go up box, 2, lower box, 3, first cell body, 4, impel the axle bed, 5, base, 6, rubber strip, 7, axle bed, 8, pressurization cap, 9, second cell body, 10, soil sample, 11, material board, 12, hand formula transmission, 13, roller bearing, 14, slide, 15, push rod, 16, push rod, 17, graduated ring.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description of the present invention with reference to the accompanying drawings and embodiments is made. It should be understood that the embodiments described herein are merely for the purpose of illustrating the invention and are not intended to limit the invention.
The utility model provides a pair of an improved generation shear box's structure for friction test is shown in fig. 1 to 3, and this shear box includes box (1), last box (2) down. The upper box comprises a first groove body (3), a propulsion shaft seat (4), a bottom plate (5) and a rubber strip (6), the propulsion shaft seat (4) and the bottom plate (5) are welded with the first groove body (3), and the rubber strip (6) and the first groove body (3) are fixedly connected through an opening in the upper portion of the groove wall.
The first groove body (3) is a square groove body, a round hole with the diameter of 7mm is formed in the center of the upper portion of the groove wall, and the circle center is located at the position where the center of the thickness of the groove wall is 2.5mm lower than the top of the groove wall.
The upper box (2) comprises a shaft seat (7), a pressurizing cap (8) and a second groove body (9), the shaft seat (7), the pressurizing cap (8) and the second groove body (9) are welded into a whole, and the second groove body (9) is a rectangular groove body.
The rubber strip (6) is a cylinder, the plane shape is a square, the diameter is consistent with the diameter of the hole of the groove wall of the lower box (1), the size of the axis is consistent with the size of the hole of the groove wall, and the rubber strip is embedded in a circular hole at the top of the groove wall.
In the embodiment, the diameter of the rubber strip (6) is consistent with the diameter of the hole of the groove wall of the lower box (1), and the size of the axis of the rubber strip is consistent with that of the hole of the groove wall.
In the embodiment, the thickness of the groove wall of the first groove body (3) is consistent with that of the groove wall of the second groove body (9), and the width of the inner groove of the second groove body (9) is consistent with that of the outer wall of the first groove body (3).
In the embodiment, the center of the propulsion shaft seat (4) coincides with the center of the outer wall of the first groove body (3), the center of the pressurization shaft seat (7) coincides with the center of the upper surface of the second groove body (9), and the center of the shaft seat (8) coincides with the center of the outer wall of the second groove body (9) in the width direction.
In the embodiment, the size of the lower bottom of the base (5) is consistent with that of the lower bottom of the first groove body (3), the width of the axle center of the slide way (14) is consistent with that of the slide way of the direct shear apparatus, and the direction of the slide way is parallel to the direction of the propulsion axle seat (4).
In the embodiment, the groove of the propulsion shaft seat (4) is matched with the ball point of the push rod (15), the groove of the shaft seat (7) is matched with the ball point of the dynamometer, and the groove of the pressurizing cap (8) is matched with the ball point of the pressurizing.
In the embodiment, the length and width of the material plate 11 are consistent with the inner wall of the second groove body (9), and the height of the material plate is 5mm higher than the inner wall of the second groove body (9).
In addition, in this embodiment, as shown in fig. 6, a push rod (16) is connected to the shaft seat on one side of the upper case, a force measuring ring (17) is connected to the end of the push rod (16), and the push rod (16) is elastically supported on the side wall of the test bed through the force measuring ring.
In addition, in this embodiment, as shown in fig. 6, a slide (14) is fixedly mounted on the test bed, a plurality of rollers (13) are slidably mounted on the slide, and the lower box is rotatably supported on the rollers.
In addition, as shown in fig. 6, the shaft seat of the side wall of the lower box is connected with a push rod (15), the end of the push rod is connected with a hand-operated transmission device for pushing the push rod in a reciprocating manner, and the hand-operated transmission device adopts a mature product in the prior art.
The utility model provides a pair of an application method for friction test's improved generation shearing box is as follows:
loading a material plate into an upper box, pressing the upper box and the material plate on a lower box under the condition that the lower box is not loaded with a soil sample 10, aligning the rear walls, contacting the ball point of the front end of a push rod with the ball point of a dynamometer through the front end shaft seat of the upper box, controlling the ball point of the push rod to contact with the shaft seat of the lower box through a motor and a gear box, contacting the ball point of a pressurizing beam with a pressurizing cap of the upper box, applying different vertical pressures, controlling the moving speed of the lower box through the gear box, testing the friction force between different material plates and rubber strips, loading the soil sample into the lower box to be level with the rubber strips, repeating the steps to test the total friction force of the material plates, the rubber strips and the soil sample, subtracting the friction force of the rubber strips to obtain the friction force of the material plates and the soil sample, and further obtaining the friction coefficient of the material.
The shearing box can test the friction coefficient between contact surfaces of different soil bodies and different materials, the surface roughness of the material plate can be processed at will, the shearing box is more suitable for the actual situation of engineering, and the shearing box can be applied to the engineering fields of pile sinking counter-force, pipe jacking counter-force, friction pile bearing capacity, shield cutter disc friction torque calculation and the like.
The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention should fall within the protection scope of the present invention.
Claims (5)
1. An improved generation shear box for friction test, includes box (1) and last box (2) down, its characterized in that: the lower box (1) comprises a first groove body (3), a propulsion shaft seat (4), a base (5) and a rubber strip (6), wherein the propulsion shaft seat (4) and the side wall of the first groove body (3) are welded into a whole, the base (5) and the bottom of the first groove body (3) are welded into a whole, and the rubber strip (6) and the first groove body (3) are fixedly embedded into a whole through an opening at the upper end of the groove wall;
the first groove body (3) is a square groove body, a round hole is formed in the center of the upper portion of the groove wall, the diameter of the round hole is 7mm, and the circle center is located at a position where the center of the thickness of the groove wall is 2.5mm lower than the top of the groove wall;
the upper box (2) comprises a shaft seat (7), a pressurizing cap (8) and a second groove body (9), the shaft seat (7), the pressurizing cap (8) and the second groove body (9) are welded into a whole, and the second groove body (9) is a rectangular groove body.
2. An improved shear box for friction testing according to claim 1, wherein: the rubber strip (6) is a cylinder, the planar shape is a square, the diameter is consistent with the diameter of the hole in the groove wall of the lower box (1), the size of the axis is consistent with the size of the hole in the groove wall, and the rubber strip is embedded in a circular hole in the top of the groove wall.
3. An improved shear box for friction testing according to claim 1, wherein: the thickness of the wall of the upper box (2) is consistent with that of the lower box (1), the width of the inner groove is consistent with that of the outer wall of the lower box, and the length of the inner groove is 1.5 times that of the inner groove of the lower box.
4. An improved shear box for friction testing according to claim 1, wherein: the center of the propulsion shaft seat (4) coincides with the center of the side wall of the first groove body (3), the center of the shaft seat (7) coincides with the center of the upper surface of the second groove body (9), and the center of the pressure cap (8) coincides with the center of the side wall of the width of the groove body.
5. An improved shear box for friction testing according to claim 1, wherein: the size of the lower bottom of the base (5) is consistent with that of the lower bottom of the first groove body (3), the width of the slideway is consistent with that of the center of the slideway of the direct shear apparatus, and the direction of the slideway is parallel to that of the shaft seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920585095.6U CN210742086U (en) | 2019-04-26 | 2019-04-26 | Improved shearing box for friction test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920585095.6U CN210742086U (en) | 2019-04-26 | 2019-04-26 | Improved shearing box for friction test |
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| Publication Number | Publication Date |
|---|---|
| CN210742086U true CN210742086U (en) | 2020-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920585095.6U Expired - Fee Related CN210742086U (en) | 2019-04-26 | 2019-04-26 | Improved shearing box for friction test |
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| Country | Link |
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| CN (1) | CN210742086U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113504175A (en) * | 2021-06-21 | 2021-10-15 | 中山大学 | Pipe-soil contact interface friction coefficient measuring method |
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2019
- 2019-04-26 CN CN201920585095.6U patent/CN210742086U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113504175A (en) * | 2021-06-21 | 2021-10-15 | 中山大学 | Pipe-soil contact interface friction coefficient measuring method |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200612 Termination date: 20210426 |