CN116380779A - Method and device for detecting anti-skid performance of concrete prefabricated slope protection - Google Patents
Method and device for detecting anti-skid performance of concrete prefabricated slope protection Download PDFInfo
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- CN116380779A CN116380779A CN202310190282.5A CN202310190282A CN116380779A CN 116380779 A CN116380779 A CN 116380779A CN 202310190282 A CN202310190282 A CN 202310190282A CN 116380779 A CN116380779 A CN 116380779A
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- 239000004567 concrete Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 24
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- 239000011178 precast concrete Substances 0.000 claims abstract description 11
- 238000011068 loading method Methods 0.000 claims description 98
- 230000007246 mechanism Effects 0.000 claims description 51
- 238000010008 shearing Methods 0.000 claims description 46
- 238000010276 construction Methods 0.000 claims description 13
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- 210000001503 joint Anatomy 0.000 description 2
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- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
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Abstract
The invention discloses a method and a device for detecting the anti-skid performance of a concrete prefabricated slope protection, and relates to the technical field of detection of the anti-skid performance of the prefabricated slope protection. According to the invention, the rubber material is used as the contact surface of the anti-skid pattern to perform a shear performance test between concrete and rubber, and the anti-skid friction stress of the contact surface under different normal stresses and different rubber materials can be measured through the shear performance test, so that the anti-skid performance of the precast concrete slope protection is analyzed, the purposes of saving materials, improving test efficiency and reducing test cost are achieved, and the method can be widely applied to the test of the anti-skid performance of the precast concrete slope protection.
Description
Technical Field
The invention relates to the technical field of detection of anti-skid performance of prefabricated revetments, in particular to a method and a device for detecting the anti-skid performance of concrete prefabricated revetments.
Background
The concrete hexahedral precast block slope protection is widely adopted because of having the advantages of being convenient for detect, convenient laying, guarantee time limit for a project, easy maintenance etc., is a common hydraulic engineering dyke slope surface protection component for improving the anti-impact, wave-eliminating, impervious ability of side slope. The traditional concrete hexahedral precast block is manufactured according to the structural type, quality requirement and construction process of the anti-slip slope protection concrete precast block, and is manufactured according to a mode of processing a mould according to a design drawing and a process file, the mould is similar to a standard concrete compression-resistant test piece structure, the mould is observed and maintained after concrete is poured, and maintenance is carried out after demoulding until the precast block is completed. The current detection device for the anti-slip performance of the slope protection can refer to a pendulum type anti-slip value test method of a traffic department or a slope critical angle method of a building department, and the anti-slip performance of the slope protection is judged by measuring a pendulum value or a slope critical angle, but the two methods are not suitable for the slope protection designed through structures such as stripes, salient points and the like, and the anti-slip critical angle tester is required to be equipped for the slope protection, once the structural design is required to be changed, the mould opening cost and the cost of concrete raw materials are huge, the mould opening cost is inconvenient for large-scale development of the anti-slip performance model test of the slope protection, and in the actual development test process, we find that the consumption of precast blocks required by a scale model of the slope protection is small, if a mould box meeting the test requirement is customized by a manufacturer, the mould opening cost of a steel mould is 0.5-3 ten thousand different in each specification, and the mould opening cost of the mould is larger in comparison test with various different specifications.
Disclosure of Invention
In order to overcome the defects, the invention provides a method and a device for detecting the anti-slip performance of the precast concrete slope protection, the invention provides normal loading for the precast block to be detected by arranging the normal loading mechanism, provides shear loading for the precast block to be detected by arranging the shear loading mechanism, takes rubber materials as an anti-slip pattern contact surface, performs a shear performance test between concrete and rubber, and measures the anti-slip friction of contact surfaces under different normal stresses and different rubber materials through the shear performance test to obtain the anti-slip performance of the precast concrete block so as to achieve the purposes of saving materials, improving test efficiency and reducing test cost, and can be widely applied to the test of the anti-slip performance of the precast concrete slope protection.
In one aspect, a device for detecting the anti-slip performance of a concrete prefabricated slope protection is provided, which comprises the following contents:
the device comprises a bottom plate, a normal loading mechanism, rubber and a shearing loading mechanism, wherein the precast block to be tested is placed on the bottom plate, the rubber is placed at the top of the precast block to be tested, the normal loading mechanism is used for providing normal loading for the rubber, and the shearing loading mechanism is used for providing shearing loading for the rubber.
Preferably, the device further comprises a lower shearing box and an upper shearing box, wherein the precast block to be tested is placed in the lower shearing box, and the rubber is placed in the upper shearing box.
Preferably, the shearing direction loading mechanism comprises a horizontal pushing mechanism and an upper shearing box connecting plate, one end of the upper shearing box connecting plate is in butt joint with the upper shearing box, and the other end of the upper shearing box connecting plate is in butt joint with the output end of the horizontal pushing mechanism.
Preferably, the device further comprises a sliding part, wherein the sliding part comprises a sliding rail and a sliding part which is connected with the sliding rail in a sliding way, and the precast block to be tested and the lower shearing box are both placed on the sliding part.
Preferably, the rubber sealing device further comprises a vertical frame, wherein the normal loading mechanism is fixedly arranged on the vertical frame and is positioned at the top of the rubber.
Preferably, the rubber is in contact with the construction surface of the precast block.
Preferably, the normal loading mechanism comprises a vertical pushing mechanism, and the vertical pushing mechanism and the horizontal pushing mechanism are hydraulic cylinders.
In another aspect, a method for detecting the anti-slip performance of a concrete prefabricated slope protection is provided, which comprises the following steps:
manufacturing a prefabricated slope protection reduced scale model, and placing rubber blocks on the construction surface of the prefabricated blocks;
applying normal loading to the rubber block, then applying shearing loading to test the anti-skid friction force between the rubber block and the prefabricated block reduced scale model construction surface;
and fitting out mechanical parameters of relative sliding between the rubber block and the structural surface of the prefabricated block reduced scale model according to the anti-sliding friction force, so as to obtain an anti-sliding friction coefficient and cohesive force strength.
Preferably, the value of the normal loading is calculated through the dead weight of the human body, the slope ratio and the contact area of the human vamp and the slope, and the normal loading is divided into a plurality of groups of simulated loading by adopting a grading loading method.
Preferably, when testing the anti-skid friction force between a plurality of groups of rubber blocks under normal loading and the construction surface of the prefabricated block reduced scale model, the method specifically comprises the following steps:
applying any simulation normal loading to the rubber block;
applying a shearing direction loading to the rubber block subjected to the simulated loading, wherein the value of the shearing direction loading is uniformly increased along with the action duration;
if the displacement of the prefabricated block scale model suddenly increases, recording the current shear direction loading value and the simulation normal loading;
and drawing a fitting curve by taking different simulation normal loads as a horizontal axis and shearing loads as a vertical axis, and reading the friction coefficient and the internal friction angle of the slope protection.
The beneficial effects of the invention are as follows:
according to the invention, the normal loading mechanism is arranged to provide normal loading for the precast block to be tested, the shear loading mechanism provides shear loading for the precast block to be tested, the rubber material is used as an anti-slip pattern contact surface, the shear performance test between concrete and rubber is carried out, the anti-slip friction force of contact surfaces under different normal stresses and different rubber materials is measured through the shear performance test, and the anti-slip performance of the precast concrete block is obtained, so that the purposes of saving materials, improving test efficiency and reducing test cost are achieved, and the method can be widely applied to the test of the anti-slip performance of the precast slope protection of the anti-slip slope protection concrete.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
FIG. 1 is a perspective view of an apparatus for detecting slip resistance of a concrete precast slope according to an embodiment of the present invention;
FIG. 2 is a perspective view of an upper shear box of the apparatus for detecting the slip resistance of a precast concrete slope protection shown in FIG. 1;
FIG. 3 is a perspective view of an upper shear box connecting plate of the apparatus for detecting the slip resistance of a concrete prefabricated slope protection shown in FIG. 1;
FIG. 4 is a flow chart of a method for detecting slip resistance of a precast concrete slope;
FIG. 5 is a graph of a fit of shear loads under different normal loads in a method for detecting the slip resistance of a precast concrete slope;
legend: 1-normal loading mechanism; 2-standing frames; 3-upper shear box; 4-a lower shear box; 5-an upper shear box connecting plate; 6-a bottom plate; 7-a horizontal pushing mechanism; 8-sliding rails; 9-a slider; 10-pressing plate.
Detailed Description
Embodiments of the technical scheme of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and thus are merely examples, and are not intended to limit the scope of the present invention.
It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.
As shown in fig. 1, a device for detecting the anti-slip performance of a concrete prefabricated slope protection comprises the following contents:
the device comprises a bottom plate 6, a normal loading mechanism 1, rubber and a shearing loading mechanism, wherein the precast block to be tested is placed on the bottom plate 6, the rubber is placed at the top of the precast block to be tested, the normal loading mechanism 1 is used for providing normal loading for the rubber, and the shearing loading mechanism is used for providing shearing loading for the rubber.
The prefabricated plate to be tested is manufactured according to the design data of the reduced scale model, aggregate is carried out according to the reduced scale proportion during pouring, and concrete is prepared according to the determined mixing proportion; the normal loading mechanism provides normal loading for the precast block to be tested, the shearing loading mechanism provides shearing loading for the precast block to be tested, and rubber is used for simulating the rubber sole of the sole of a pedestrian;
in an experiment, starting a normal loading mechanism to apply compressive stress in a vertical direction, then applying thrust in a horizontal direction, testing anti-slip friction force between rubber and a structural surface of a precast block under different axial stresses, acquiring at least more than 3 groups of test data, and fitting out mechanical parameters of the relative sliding of a contact surface under a rubber material and the precast concrete block for evaluating the anti-slip performance of a slope protection;
because the application area of normal loading mechanism is less, when compressive stress is great, the rubber takes place to extrude deformation easily, leads to the data inaccurate, so when in actual use, place clamp plate 10 at the rubber top, the compressive stress that normal loading mechanism applyed is acted on clamp plate 10 earlier, and the atress face of rubber is passed through clamp plate 10 to the rethread clamp plate 10, avoids because local compressive stress leads to the rubber to take place compressive deformation to destroy to lead to the normal stress of applyieldingly to be partial big.
As shown in fig. 2, more specifically, the prefabricated block to be tested is placed in the lower shear box 4, and further comprises a lower shear box 4 and an upper shear box 3, and the rubber is placed in the upper shear box 3.
The effect of cutting the box under to the prefabricated section setting is that, because the prefabricated section is not singly placed, but a plurality of prefabricated sections tile side by side on the bank protection, need consider the prefabricated section when aassessment skid resistance ability and receive the side direction restraining force of peripheral prefabricated section, cut the box down and be hollow cuboid, cut the box down the structure and cut the box down similar, be hollow cuboid structure.
As shown in fig. 3, more specifically, the shear loading mechanism includes a horizontal pushing mechanism 7 and an upper shear box connecting plate 5, one end of the upper shear box connecting plate 5 is abutted to the upper shear box 3, and the other end of the upper shear box connecting plate 5 is abutted to the output end of the horizontal pushing mechanism 7.
More specifically, the prefabricated section to be tested and the lower shearing box 4 are placed on the sliding part 9.
The lower shear box and the precast block to be tested are all placed on the sliding piece, when the rubber material lower contact surface and the concrete precast block produce relative sliding, the sliding piece slides on the sliding rail, and the experimental phenomenon can be conveniently observed by personnel.
More specifically, the rubber vertical frame further comprises a vertical frame 2, the normal loading mechanism 1 is fixedly arranged on the vertical frame 2, and the normal loading mechanism 1 is positioned at the top of the rubber.
The vertical frame is adopted to conveniently fix the normal loading mechanism, and the action of the normal loading mechanism is kept vertical and is not deviated.
More specifically, the rubber is in contact with the construction surface of the precast block.
More specifically, the normal loading mechanism 1 comprises a vertical pushing mechanism, and the vertical pushing mechanism and the horizontal pushing mechanism 7 are hydraulic cylinders.
As shown in fig. 4, a method for detecting the anti-slip performance of a concrete prefabricated slope protection comprises the following steps:
manufacturing a prefabricated slope protection reduced scale model, and placing rubber blocks on the construction surface of the prefabricated blocks;
applying normal loading to the rubber block, then applying shearing loading to test the anti-skid friction force between the rubber block and the prefabricated block reduced scale model construction surface;
and fitting out mechanical parameters of relative sliding between the rubber block and the structural surface of the prefabricated block reduced scale model according to the anti-sliding friction force, so as to obtain an anti-sliding friction coefficient and cohesive force strength.
Drawing the obtained anti-slip force value into a graph with a normal loading as a horizontal axis and a shearing loading as a vertical axis by adopting excel software; fitting shear load curves under different normal loads by adopting linear fitting in excel; and respectively reading the slope and the intercept in the linear fitting curve, wherein the slope is the friction coefficient, and the intercept is the cohesive force intensity.
Taking normal loading as 3-level example, when the calculated normal loading is 2.7MPa, taking simulated normal stress as 0.3MPa,1.5MPa and 2.7MPa respectively, and obtaining the anti-skid force shown in the following table:
the fitted curve drawn from the above table is shown in fig. 5, and it can be seen from the fitted curve that the friction coefficient is 1.208 and the cohesive strength is 6.043MPa.
More specifically, the normal loading value is calculated through the dead weight of the human body, the slope ratio and the contact area of the human vamp and the slope, and the normal loading is divided into a plurality of groups of simulated loading by adopting a grading loading method.
In the implementation, in order to accurately determine the anti-skid effect and consider the personal safety of slope personnel, the normal loading should be determined first, and the normal loading calculation formula is shown as follows:
N＝(Mg/s)*tan(H/L)
wherein M is the weight of slope-related personnel, g is a weight constant, H is the vertical height of the slope protection, L is the projection horizontal width of the slope protection slope, and S is the actual contact area between the vamp and the slope in the slope-related process.
Taking a common flat sole as an example, for example, the actual contact area of the vamp and the slope surface in the slope-related process is S, and the area S is calculated by adopting a drawing method under the condition of considering the least favorable load according to the stripe condition of the slope surface.
In order to obtain more anti-skid force values, a shearing loading value fitting curve under different normal loads is drawn, N is used as the maximum normal load, and the shearing loading values are loaded on the rubber block in a grading manner, so that horizontal shearing force values under different normal loads under the same anti-skid condition are obtained.
If N is the maximum normal load and 20% is used as the first stage load, the simulated loads after loading are respectively 0.2N,0.4N,0.6N,0.8N and N.
More specifically, when testing the anti-skid friction between the rubber blocks under the normal loading of a plurality of groups and the construction surface of the prefabricated block reduced scale model, the method specifically comprises the following steps:
applying any simulation normal loading to the rubber block;
applying a shearing direction loading to the rubber block subjected to the simulated loading, wherein the value of the shearing direction loading is uniformly increased along with the action duration;
if the displacement of the prefabricated block scale model suddenly increases, recording the current shear direction loading value and the simulation normal loading;
and drawing a fitting curve by taking different simulation normal loads as a horizontal axis and shearing loads as a vertical axis, and reading the slope and intercept of the fitting curve to obtain the slope protection friction coefficient and the internal friction angle.
The anti-skid performance test under any simulation loading value needs to be measured for 3 times or more, and if a certain value is obviously different from other values, the corresponding test under the simulation loading value needs to be measured again.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will 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 invention, and are intended to be included within the scope of the appended claims and description.
Claims (10)
1. A device that is used for prefabricated bank protection skid resistance to detect of concrete, its characterized in that: the novel shear loading device comprises a bottom plate (6), a normal loading mechanism (1), rubber and a shear loading mechanism, wherein the precast block to be tested is placed on the bottom plate (6), the rubber is placed at the top of the precast block to be tested, the normal loading mechanism (1) is used for providing normal loading for the rubber, and the shear loading mechanism is used for providing shear loading for the rubber.
2. The device for detecting the skid resistance of a concrete prefabricated slope according to claim 1, wherein: the device further comprises a lower shearing box (4) and an upper shearing box (3), wherein the precast block to be detected is placed in the lower shearing box (4), and the rubber is placed in the upper shearing box (3).
3. The device for detecting the anti-slip performance of a concrete prefabricated slope protection according to claim 2, wherein: the shearing and loading mechanism comprises a horizontal pushing mechanism (7) and an upper shearing box connecting plate (5), one end of the upper shearing box connecting plate (5) is abutted to the upper shearing box (3), and the other end of the upper shearing box connecting plate (5) is abutted to the output end of the horizontal pushing mechanism (7).
4. The device for detecting the anti-slip performance of a concrete prefabricated slope protection according to claim 2, wherein: the device comprises a prefabricated block to be detected, a lower shearing box (4) and a sliding component, wherein the sliding component comprises a sliding rail (8) and a sliding piece (9) which is in sliding connection with the sliding rail (8), and the prefabricated block to be detected and the lower shearing box (4) are both placed on the sliding piece (9).
5. The device for detecting the skid resistance of a concrete prefabricated slope according to claim 1, wherein: the rubber vertical frame is characterized by further comprising a vertical frame (2), the normal loading mechanism (1) is fixedly arranged on the vertical frame (2), and the normal loading mechanism (1) is positioned at the top of the rubber.
6. The device for detecting the skid resistance of a concrete prefabricated slope according to claim 1, wherein: the rubber is in contact with the construction surface of the precast block.
7. The device for detecting the skid resistance of a concrete prefabricated slope according to claim 1, wherein: the normal loading mechanism (1) comprises a vertical pushing mechanism, and the vertical pushing mechanism and the horizontal pushing mechanism (7) are hydraulic cylinders.
8. The method for detecting the anti-skid performance of the concrete prefabricated slope protection is characterized by comprising the following steps of:
manufacturing a prefabricated slope protection reduced scale model, and placing rubber blocks on the construction surface of the prefabricated blocks;
applying normal loading to the rubber block, then applying shearing loading to test the anti-skid friction force between the rubber block and the prefabricated block reduced scale model construction surface;
and fitting out mechanical parameters of relative sliding between the rubber block and the structural surface of the prefabricated block reduced scale model according to the anti-sliding friction force, so as to obtain an anti-sliding friction coefficient and cohesive force strength.
9. The method for detecting the anti-slip performance of the concrete prefabricated slope protection according to claim 8, wherein the normal loading is calculated by the dead weight of a slope involving person, the slope ratio and the contact area between the human vamp and the slope, and the normal loading is divided into a plurality of groups of simulated loading by adopting a grading loading method.
10. The method for detecting the anti-slip performance of the precast concrete slope protection according to claim 9, wherein the specific steps of testing the anti-slip force between a plurality of groups of rubber blocks under normal loading and the construction surface of the shrinkage model of the precast block, and fitting the friction coefficient and the cohesive strength are as follows:
applying any simulation normal loading to the rubber block;
applying a shearing direction loading to the rubber block subjected to the simulated loading, wherein the value of the shearing direction loading is uniformly increased along with the action duration;
if the displacement of the prefabricated block scale model suddenly increases, recording the current shear direction loading value and the simulation normal loading;
and drawing a fitting curve by taking different simulation normal loads as a horizontal axis and shearing loads as a vertical axis, and reading the friction coefficient and the internal friction angle of the slope protection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310190282.5A CN116380779A (en) | 2023-03-02 | 2023-03-02 | Method and device for detecting anti-skid performance of concrete prefabricated slope protection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310190282.5A CN116380779A (en) | 2023-03-02 | 2023-03-02 | Method and device for detecting anti-skid performance of concrete prefabricated slope protection |
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