CN112461683A - Roller compacted concrete shear strength one-way oblique cut method normal position detection device - Google Patents
Roller compacted concrete shear strength one-way oblique cut method normal position detection device Download PDFInfo
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- CN112461683A CN112461683A CN202010083491.6A CN202010083491A CN112461683A CN 112461683 A CN112461683 A CN 112461683A CN 202010083491 A CN202010083491 A CN 202010083491A CN 112461683 A CN112461683 A CN 112461683A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
A roller compacted concrete shear strength one-way oblique cutting method in-situ detection device comprises a shear strength sample containing a cutting groove and positioned in a roller compacted concrete rectangular pit; a stress steel base plate, an oil jack, a spherical support and a counter-force steel plate are sequentially arranged on the shear strength sample; the oil jack is connected with the oil hydraulic pump through a pressure pipe. According to the invention, through the detection device, a horizontal load is applied to the shear strength test sample and is decomposed into a beveling load and a normal load on the beveling surface of the cutting groove until the shear strength test sample is damaged on the beveling surface of the cutting groove, the maximum value is read, and the beveling load and the normal load corresponding to a plurality of maximum values are read and calculated by adjusting the angle of the beveling surface of the cutting groove, so that the shear strength index is further worked out, therefore, the device is strong in practicability and accurate in detection.
Description
Technical Field
The invention relates to a roller compacted concrete shear strength unidirectional oblique cutting method in-situ detection device.
Background
With the development of water conservancy projects in China, the number of roller compacted concrete dams is increasing, and the shear strength of roller compacted concrete is directly related to the stability analysis of the dams, so that the in-situ shear strength test of roller compacted concrete is very important work.
At present, the in-situ shear strength test mainly adopts a double-sided shear horizontal pushing method: in the vertical direction of concrete top surface, adopt hydraulic jack, exert normal load, generally adopt the weight (like iron plate, concrete piece etc.) as counter-force system, in the horizontal direction, adopt hydraulic jack, exert and cut to load, detect. The method has the following defects: because the counterforce system needs a large amount of weighting blocks (such as iron blocks, concrete blocks and the like), the working intensity and the required field are large, the safety requirement is high, and the labor efficiency is low. Therefore, design and creation are required.
Disclosure of Invention
The invention provides a roller compacted concrete shear strength unidirectional oblique cutting method in-situ detection device with strong practicability, accurate detection and reasonable design and a detection method adopting the same.
The technical scheme adopted by the invention is as follows: a roller compacted concrete shear strength one-way oblique cutting method in-situ detection device comprises a shear strength sample containing a cutting groove and positioned in a roller compacted concrete rectangular pit; a stress steel base plate, an oil jack, a spherical support and a counter-force steel plate are sequentially arranged on the shear strength sample; the oil jack is connected with the oil hydraulic pump through a pressure pipe. According to the invention, a horizontal load is applied to the shear strength test sample through the detection device and is decomposed into a beveling load and a normal load on the beveling surface of the cutting groove until the shear strength test sample is damaged on the beveling surface of the cutting groove, the maximum value is read, and the beveling load and the normal load corresponding to a plurality of maximum values are read and calculated by adjusting the angle of the beveling surface of the cutting groove, so that the shear strength index is further worked out.
Further, the width of the rectangular pit is not less than 500mm, the height of the rectangular pit is 350mm, and the length of the rectangular pit meets the operation requirement.
Furthermore, the shear strength test sample is a rectangular body, the width is 290mm, the height is 350mm, the length is not less than 350mm, the top surface is flush with the surface of the roller compacted concrete, the bottom surface and one end surface are connected with the roller compacted concrete, the other end surface is contacted with the stressed steel backing plate, the top surface is contacted with the positioning steel backing plate, and the distance between the two side surfaces and the corresponding side wall of the rectangular pit is equal.
Further, the cutting grooves are 0.5 mm-2 mm in width and 10mm in depth and comprise upper cutting grooves, lower cutting grooves and middle cutting grooves; the side surface of the upper cutting groove is parallel to the end surface of the shear strength test sample, and the surface of the upper cutting groove is in the same plane with the top surface of the shear strength test sample; the top surface and the bottom surface of the lower cutting groove are parallel to the top surface of the shear strength sample, the surface of the lower cutting groove is in the same plane with the end surface of the shear strength sample, and the distance between the top surface of the lower cutting groove and the top surface of the shear strength sample is 280 mm; the surface of the middle cutting groove and the side surface of the shear strength sample are in the same plane, two ends of the middle cutting groove are respectively connected with the upper cutting groove and the lower cutting groove, and the angle alpha between the middle cutting groove and the top surface of the shear strength sample is = 25-65 deg.
Furthermore, the stress steel backing plate is a rectangular plate, the thickness of the stress steel backing plate is not less than 20mm, the side surface of the stress steel backing plate is coplanar with the side surface of the shear strength sample, the top surface of the stress steel backing plate is vertically and fixedly connected with the bottom surface of the positioning steel backing plate, the bottom surface of the stress steel backing plate is coplanar with the top surface of the lower cutting groove, one end surface of the stress steel backing plate is in contact with the end surface of the shear strength sample, and.
Furthermore, the positioning steel backing plate is a rectangular plate, the thickness of the positioning steel backing plate is not less than 20mm, the strip surface and the side surface of the shear strength test sample are coplanar, one end surface and the near-end side surface of the upper cutting groove are coplanar, and the other end surface and the far-end surface of the stressed steel backing plate are coplanar.
Further, the distance between the vertical intersection point of the longitudinal axis of the oil jack and the stressed steel backing plate and the top surface of the shear strength sample is 145mm, and the distance between the vertical intersection point and the side surface of the shear strength sample is 145 mm; the oil hydraulic pump is provided with a digital pressure gauge with a peak value storage function.
Further, the counter-force steel plate is a rectangular plate, the thickness of the counter-force steel plate is not less than 20mm, the length of the counter-force steel plate is slightly smaller than the width of the rectangular pit, the top surface of the counter-force steel plate is flush with the surface of the roller compacted concrete, the bottom surface of the rectangular pit is arranged in the bottom surface of the rectangular pit, one end surface of the counter-force steel plate is in surface contact with the top surface of the oil jack through.
The invention has the beneficial effects that: (1) in the detection process, applying a horizontal load on the shear strength test sample and decomposing the horizontal load into a beveling load and a normal load on the beveling surface of the cutting groove until the shear strength test sample is damaged on the beveling surface of the cutting groove, reading the maximum value, reading and calculating the corresponding beveling load and normal load under a plurality of maximum values by adjusting the angle of the beveling surface of the cutting groove, further solving the shear strength index, and having accurate detection and reasonable design; (2) instruments and parts are purchased, processed, assembled and carried conveniently, so that the popularization value is greatly improved; (3) the hydraulic jack is used for unidirectional loading only in the horizontal direction, the hydraulic jack is not used for loading in the vertical direction, a large number of weighting blocks (such as iron blocks, concrete blocks and the like) are not needed to be used as a counter-force system, the problems of large working intensity and required field, high safety requirement and low labor efficiency of the existing method are solved, and technical support is provided for construction acceptance, design reinforcement, quality supervision and the like.
Drawings
Fig. 1 is a schematic front view of the present invention in use.
FIG. 2 is a schematic cross-sectional view of the invention using A-A.
Fig. 3 is a schematic cross-sectional view of the present invention using B-B.
Figure 4 is a schematic cross-sectional view of the invention using C-C.
Figure 5 is a schematic cross-sectional view of the invention using D-D.
FIG. 6 is a schematic cross-sectional view of the invention using E-E.
FIG. 7 is a schematic cross-sectional view of the present invention using F-F.
FIG. 8 is a schematic cross-sectional view of the invention using G-G.
Fig. 9 is a schematic cross-sectional view of the invention using H-H.
FIG. 10 is a schematic cross-sectional view of the present invention using I-I.
FIG. 11 is a schematic view of the shear strength specimen positioning groove cutting of the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the invention to these embodiments. It will be appreciated by those skilled in the art that the present invention encompasses all alternatives, modifications and equivalents as may be included within the scope of the claims.
Referring to fig. 1-11, a roller compacted concrete shear strength unidirectional beveling method in-situ detection device comprises a shear strength test sample 8 containing a cutting groove 5, which is positioned in a rectangular pit 12 of roller compacted concrete 7; a stress steel backing plate 11, an oil jack 9, a spherical support 6 and a counterforce steel plate 10 are sequentially arranged on the shear strength sample 8; the hydraulic jack 9 is connected with the hydraulic pump 4 through the pressure pipe 2. According to the invention, a horizontal load is applied to the shear strength test sample 8 through the detection device and is decomposed into a shear load and a normal load on the oblique cutting surface of the cutting groove 5 until the shear strength test sample 8 is damaged on the oblique cutting surface of the cutting groove 5, the maximum value is read, and the corresponding shear load and normal load under a plurality of maximum values are read and calculated by adjusting the angle of the oblique cutting surface of the cutting groove 5, so that the shear strength index is further worked out.
The rectangular pit 12 of this embodiment has a width of 500mm, a height of 350mm and a length of 500 mm.
The cutting groove 5 of the embodiment has a width of 1.5mm and a depth of 10mm, and comprises an upper cutting groove, a lower cutting groove and a middle cutting groove; the side surface of the upper cutting groove is parallel to the end surface of the shear strength test sample 8, and the surface of the upper cutting groove is in the same plane with the top surface of the shear strength test sample 8; the top surface and the bottom surface of the lower cutting groove are parallel to the top surface of the shear strength test sample 8, the surface of the lower cutting groove is in the same plane with the end surface of the shear strength test sample 8 contacted with the stressed steel backing plate 11, and the distance between the top surface of the lower cutting groove and the top surface of the shear strength test sample 8 is 280 mm; the surface of the middle cutting groove and the side surface of the shear strength sample 8 are on the same plane, two ends of the middle cutting groove are respectively connected with the upper cutting groove and the lower cutting groove, and the angle alpha =45 degrees is formed between the middle cutting groove and the oblique cutting plane of the shear strength sample top surface 8.
In this embodiment, the stressed steel backing plate 11 is a rectangular plate, the thickness of the stressed steel backing plate is 20mm, the side surface of the stressed steel backing plate is coplanar with the side surface of the shear strength test sample 8, the top surface of the stressed steel backing plate is vertically connected with the bottom surface of the positioning steel backing plate 1, the bottom surface of the stressed steel backing plate is coplanar with the top surface of the lower cutting groove, one end surface of the stressed steel backing plate is in contact with the end surface of the shear strength test.
In this embodiment, the positioning steel shim plate 1 is a rectangular plate with a thickness of 20mm, the same plane as the side surface of the shear strength test sample 8, the same plane as the side surface of the near end of the upper cutting groove, and the same plane as the end surface of the far end of the stressed steel shim plate 11.
In this embodiment, the distance between the vertical intersection point of the longitudinal axis of the hydraulic jack 9 and the stressed steel base plate 11 and the top surface of the shear strength test sample 8 is 145mm, and the distance between the vertical intersection point and the side surface of the shear strength test sample 8 is 145mm, and the hydraulic pump 4 is provided with the digital pressure gauge 3 having a peak value storage function.
The reaction force steel plate 10 of this embodiment is the rectangular plate, and thickness 30mm, length 490mm, and the top surface flushes with roller compacted concrete 7 surface, and rectangular hole 12 bottom surface is arranged in to the bottom surface, and one terminal surface passes through spherical bearing 6 and hydraulic jack 9 top surface contact, and another terminal surface and rectangular hole 12 pithead contact.
The detection steps of this embodiment are as follows: (1) cutting to form a rectangular pit 12 and a shear strength sample 8 by adopting a rail cutting machine and matching with a chiseling and polishing tool (a hammer, a flat chisel, a polishing machine and the like); (2) a portable marble cutter 13 is adopted, a cutting piece 14 is installed, the cutting depth of the cutting piece 14 is adjusted to be 10mm, and cutting is carried out along the side surface, the end surface and the top surface of the shear strength sample 8 to form a cutting groove 5; (3) a stress steel backing plate 11, a positioning steel backing plate 1, an oil jack 9, a spherical support 6 and a counterforce steel plate 10 are sequentially arranged on the shear strength sample 8; (4) the oil pressure jack 9 is connected with the oil pressure pump 4 through the pressure pipe 2, applies horizontal load to the shear strength test sample 8 and decomposes the horizontal load into a beveling load and a normal load on the beveling plane of the cutting groove 5 until the shear strength test sample 8 is damaged on the beveling plane of the cutting groove 5, and reads the maximum value; (5) and (4) adjusting the angles of the chamfer plane of the cutting groove 5 to be alpha =25 degrees, 35 degrees, 45 degrees, 55 degrees and 65 degrees according to the steps (1) to (4), reading and calculating corresponding chamfer load and normal load under 5 maximum values, and further calculating the shear strength index.
Claims (9)
1. The utility model provides a roller compacted concrete shear strength one-way oblique cut method normal position detection device which characterized in that: the test piece comprises a shear strength test piece which is positioned in a roller compacted concrete rectangular pit and contains a cutting groove; a stress steel base plate, an oil jack, a spherical support and a counter-force steel plate are sequentially arranged on the shear strength sample; the oil jack is connected with the oil hydraulic pump through a pressure pipe.
2. The roller compacted concrete shear strength one-way oblique cutting method in-situ detection device according to claim 1, characterized in that: the width of the rectangular pit is not less than 500mm, the height of the rectangular pit is 350mm, and the length of the rectangular pit meets the operation requirement.
3. The roller compacted concrete shear strength one-way oblique cutting method in-situ detection device according to claim 1, characterized in that: the shear strength sample is a rectangular body, the width of the sample is 290mm, the height of the sample is 350mm, the length of the sample is not less than 350mm, the top surface of the sample is flush with the surface of the roller compacted concrete, the bottom surface and one end surface of the sample are connected with the roller compacted concrete, the other end surface of the sample is in contact with a stressed steel backing plate, the top surface of the sample is in contact with a positioning steel backing plate, and the distance between the two side surfaces of the sample.
4. The roller compacted concrete shear strength one-way oblique cutting method in-situ detection device according to claim 1, characterized in that: the cutting grooves are 0.5 mm-2 mm in width and 10mm in depth and comprise upper cutting grooves, lower cutting grooves and middle cutting grooves; the side surface of the upper cutting groove is parallel to the end surface of the shear strength test sample, and the surface of the upper cutting groove is in the same plane with the top surface of the shear strength test sample; the top surface and the bottom surface of the lower cutting groove are parallel to the top surface of the shear strength sample, the surface of the lower cutting groove is in the same plane with the end surface of the shear strength sample, and the distance between the top surface of the lower cutting groove and the top surface of the shear strength sample is 280 mm; the surface of the middle cutting groove and the side surface of the shear strength sample are in the same plane, two ends of the middle cutting groove are respectively connected with the upper cutting groove and the lower cutting groove, and the angle alpha between the middle cutting groove and the top surface of the shear strength sample is = 25-65 deg.
5. The roller compacted concrete shear strength one-way oblique cutting method in-situ detection device according to claim 1, characterized in that: the stress steel backing plate is a rectangular plate, the thickness of the stress steel backing plate is not less than 20mm, the side surface of the stress steel backing plate is coplanar with the side surface of the shear strength sample, the top surface of the stress steel backing plate is vertically and fixedly connected with the bottom surface of the positioning steel backing plate, the bottom surface of the stress steel backing plate is coplanar with the top surface of the lower cutting groove, one end surface of the stress steel backing plate is in contact with the end surface of the shear strength sample.
6. The roller compacted concrete shear strength one-way oblique cutting method in-situ detection device according to claim 5, characterized in that: the positioning steel backing plate is a rectangular plate, the thickness of the positioning steel backing plate is not less than 20mm, the strip surface and the side surface of the shear strength test sample are coplanar, one end surface and the near-end side surface of the upper cutting groove are coplanar, and the other end surface and the far-end surface of the stressed steel backing plate are coplanar.
7. The roller compacted concrete shear strength one-way oblique cutting method in-situ detection device according to claim 1, characterized in that: the distance between the vertical intersection point of the longitudinal axis of the oil jack and the stressed steel backing plate and the top surface of the shear strength sample is 145mm, and the distance between the vertical intersection point and the side surface of the shear strength sample is 145 mm; the oil hydraulic pump is provided with a digital pressure gauge with a peak value storage function.
8. The roller compacted concrete shear strength one-way oblique cutting method in-situ detection device according to claim 1, characterized in that: the counter-force steel plate is a rectangular plate, the thickness of the counter-force steel plate is not less than 20mm, the length of the counter-force steel plate is slightly smaller than the width of the rectangular pit, the top surface of the counter-force steel plate is flush with the surface of the roller compacted concrete, the bottom surface of the rectangular pit is arranged in the bottom surface of the rectangular pit, one end surface of the counter-force steel plate is in contact with the top surface of the hydraulic jack through.
9. A detection method of a roller compacted concrete shear strength unidirectional oblique cutting method in-situ detection device comprises the following detection steps: (1) cutting a rectangular pit and a shear strength sample by adopting a track cutting machine and matching with a chiseling and polishing tool (a hammer, a flat chisel, a polishing machine and the like); (2) mounting a cutting blade by adopting a portable marble cutting machine, adjusting the cutting depth of the cutting blade to be 10mm, and cutting along the side surface, the end surface and the top surface of the shear strength sample to form a cutting groove; (3) a stress steel base plate, a positioning steel base plate, an oil jack, a spherical support and a counter-force steel plate are sequentially arranged on the shear strength sample; (4) the hydraulic jack is connected with the hydraulic pump through a pressure pipe, applies horizontal load to the shear strength test sample and decomposes the horizontal load into a beveling load and a normal load on the beveling surface of the cutting groove until the shear strength test sample is damaged on the beveling surface of the cutting groove, and reads the maximum value; (5) and (4) adjusting the angles alpha =25 °, 35 °, 45 °, 55 ° and 65 ° of the chamfer cuts of the cutting grooves according to the steps (1) to (4), reading and calculating corresponding chamfer cutting loads and normal loads under 5 maximum values, and further calculating the shear strength index.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010083491.6A CN112461683A (en) | 2020-02-09 | 2020-02-09 | Roller compacted concrete shear strength one-way oblique cut method normal position detection device |
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| CN202010083491.6A CN112461683A (en) | 2020-02-09 | 2020-02-09 | Roller compacted concrete shear strength one-way oblique cut method normal position detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112945758A (en) * | 2021-04-12 | 2021-06-11 | 重庆市市政设计研究院有限公司 | Detection method for shear index of compacted filling |
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2020
- 2020-02-09 CN CN202010083491.6A patent/CN112461683A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112945758A (en) * | 2021-04-12 | 2021-06-11 | 重庆市市政设计研究院有限公司 | Detection method for shear index of compacted filling |
| CN112945758B (en) * | 2021-04-12 | 2024-01-12 | 重庆市市政设计研究院有限公司 | Detection method for compaction filling shear index |
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