GB2585436A - Cylindrical concrete specimen splitting device and splitting method - Google Patents
Cylindrical concrete specimen splitting device and splitting method Download PDFInfo
- Publication number
- GB2585436A GB2585436A GB2005194.2A GB202005194A GB2585436A GB 2585436 A GB2585436 A GB 2585436A GB 202005194 A GB202005194 A GB 202005194A GB 2585436 A GB2585436 A GB 2585436A
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- specimen
- splitting
- blade
- lead screw
- slide block
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000035939 shock Effects 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 4
- 238000009792 diffusion process Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 4
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 210000000887 face Anatomy 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/32—Methods and apparatus specially adapted for working materials which can easily be split, e.g. mica, slate, schist
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/22—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by cutting, e.g. incising
- B28D1/222—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by cutting, e.g. incising by pressing, e.g. presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/26—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by impact tools, e.g. by chisels or other tools having a cutting edge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/32—Methods and apparatus specially adapted for working materials which can easily be split, e.g. mica, slate, schist
- B28D1/322—Splitting of the working materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/32—Methods and apparatus specially adapted for working materials which can easily be split, e.g. mica, slate, schist
- B28D1/327—Methods and apparatus specially adapted for working materials which can easily be split, e.g. mica, slate, schist for cutting or shearing easily splittable working materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D7/00—Accessories specially adapted for use with machines or devices of the preceding groups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D7/00—Accessories specially adapted for use with machines or devices of the preceding groups
- B28D7/04—Accessories specially adapted for use with machines or devices of the preceding groups for supporting or holding work or conveying or discharging work
-
- 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
- G01N3/02—Details
-
- 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
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/31—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated by a rotating fly-wheel
-
- 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
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/317—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated by electromagnetic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
Abstract
A cylindrical concrete specimen splitting device comprises a lead screw sliding rail system 1, a base 2, a specimen positioning system 3, a splitting system 4 and control switches 5. Screw sliding rail system 1 is mounted at the back end of the base while the specimen positioning system is mounted at the front end of the base and is mounted on the lead screw sliding rail system 1, and the control switches 5 are mounted on the left side of the lead screw sliding rail system 1. Rail system 1 comprises screw (1.1, Fig 2), column guide rail (1.2), rotary plate (1.3), limiting nut (1.4), slider (1.5) and fastening bolts (1.6, Fig 3). Positioning system 3 has a lower blade (3.1, Fig 4), positioning screws (3.2), cushioning rubber pads (3.3), base plate (3.4), baffle (3.5) and push rod (3.6). An associated splitting method by setting a minimum cutting edge space between an upper blade (4.6, Fig 5) and a lower blade (3.1)is described. Use of the device allows for a cylindrical concrete specimen to be stably and centrally placed, so that the axial section of the split specimen is flat and intact, and is also vertical to the upper lower surfaces of the specimen. This is especially necessary when utilising such a specimen when testing the chlorine ion diffusion coefficient (RCM) for example.
Description
CYLINDRICAL CONCRETE SPECIMEN SPLITTING DEVICE AND SPLITTING
METHOD
TECHNICAL FIELD
The present invention relates to the research field of concrete durability tests, and specifically to a cylindrical concrete specimen splitting device and a splitting method.
BACKGROUND
Rapid chloride migration (RCM) test is an important method for testing the concrete chlorine ion diffusion coefficient. In the RCM test, a cylindrical concrete specimen needs to be axially split into two equal cylindrical bodies. The axial section of the split specimen should be flat and intact and is also vertical to the upper surface and the lower surface of the specimen. According to the traditional splitting method, first, a splitting steel pad is placed at the center of a ball seat of a pressure tester; second, the lower surface of a cylindrical specimen (4)100mm/50+2mm) is centered on the pad; third, another splitting steel pad is centered on the upper surface of the specimen and is parallel with the pad on the lower surface; finally, the pressure tester slowly increases the pressure till the concrete specimen is split into two portions. The traditional splitting method has the following defects: (1). during pressurization of the pressure tester, the specimen is hard to keep horizontal such that the axial section cannot keep vertical to the upper surface and the lower surface of the specimen; (2). the contact area of a cushioning strip and the concrete specimen is too large so that the crushed area of the split specimen is too wide and the section of the split specimen is not flat; (3). the specimen is easy to break due to the fact that the pressurization speed is uneven and the pressurization stopping time is determined by eyes when the pressure tester is operated manually.
Chinese Patent Application No. 201220373397.5 discloses a clamp for a tensile test of a concrete cylinder during splitting. A concrete specimen is mounted between an upper bearing plate and a lower bearing plate. Pads are arranged at the midpoints of the wide sides of the upper bearing plate and the lower bearing plate in the direction of their long sides. A pressure tester is used for pressurizing the upper bearing plate to axially split the specimen. In cooperation with an upper rod hole group, a lower rod hole group and side rods, the clamp solves the defect (1) of the traditional splitting method. However, the used pad is same as the pad in the traditional splitting method, and the pressure tester is also operated manually, so, the defects (2) and (3) of the traditional splitting method still exist. Chinese Patent Application No. 201020594964.0 discloses a splitting auxiliary device for a concrete chlorine ion diffusion coefficient test specimen. A cylindrical concrete specimen is mounted between a cover plate and a base. The pressure tester pressurizes the cover plate. A blade below the cover plate and a blade above the base are used for splitting the specimen. The auxiliary device utilizes parallel and aligned triangular cutting edges to overcome the defect (2) of the traditional splitting method. However, the diameter of a hoop of the auxiliary device is slightly larger than the diameter of the specimen, so the defect (1) of the traditional splitting method still cannot be overcome.
Moreover, the auxiliary device still utilizes the pressure tester so that the splitting depth of the blade cannot be accurately controlled, so the defect (3) of the traditional splitting method cannot be overcome.
SUMMARY
The present invention provides a cylindrical concrete specimen splitting device and a splitting method, which can overcome defects of the traditional cylindrical concrete specimen splitting device and the splitting method. By using the cylindrical concrete specimen splitting device and the splitting method of the present invention, the section of a split cylindrical concrete specimen is flat, and the axial section is vertical to the upper surface and the lower surface of the specimen and also passes through the centers thereof The present invention adopts the following technical solution: a cylindrical concrete specimen splitting device comprises a lead screw sliding rail system, a base, a specimen positioning system, a splitting system and control switches. The specific structure and the connection relationship of the cylindrical concrete specimen splitting device are as follows: the lead screw sliding rail system is mounted at the back end of the base while the specimen positioning system is mounted at the front end of the base. The splitting system is mounted on the lead screw sliding rail system, and the control switches are mounted on the left side of the lead screw sliding rail system.
The lead screw sliding rail system is composed of a lead screw, a column guide rail, a rotary plate, a limiting nut, a slider and fastening bolts. The lead screw is mounted at the middle portion of the column guide rail. The rotary plate is mounted at the upper end of the lead screw, the limiting nut is mounted at the middle portion of the lead screw, and the slider is mounted at the lower end of the lead screw. The fastening bolts are mounted on two ends of the back side of the column guide rail.
The specimen positioning system is composed of a lower blade, two positioning screws, two cushioning rubber pads, a base plate, a baffle and a push rod. The lower blade is mounted at the middle portion of the base, the two positioning screws are respectively mounted on the left side and the right side of the back end of the lower blade, and the two cushioning rubber pads are respectively mounted on the left side and the right side of the middle portion of the lower blade. The base plate is mounted at the front portion of the base. The baffle is mounted at the front of the base plate. The push rod is mounted at the baffle.
The splitting system is composed of a motor, a belt, a flywheel, a crank slide block, a brake and an upper blade. The motor is connected with the flywheel through the belt. The flywheel is mounted at the right end of the crank slide block. The brake is mounted between the crank slide block and the flywheel. The upper blade is mounted at the lower end of the crank slide block. The control switches comprise three buttons, namely a start button, a stop button and a split button, wherein the start button and the stop button are respectively used for turning on and turning off the motor, and the split button is used for driving the crank slide block to move 10 vertically.
Each of the upper blade and the lower blade is a triangle-square combination with the length of 150 mm, the height of 31 mm and the bottom surface width of 20 mm. The upper blade is mounted at the lower end of the crank slide block, and its cutting edge line faces outwards. The cutting edge line of the lower blade and the cutting edge line of the upper blade are located in the same vertical plane and are parallel with each other.
The cushioning rubber pads are cylinders with the diameter of 35 mm and the height of 30 mm. The two cushioning rubber pads are symmetrically located on the left side and the right side of the lower blade. The distance between the centers of the two cylindrical cushioning rubber pads is 60 mm, the connection line of the centers is vertically intersected with the cutting edge line of the lower blade, and the distance between the intersection point and the back end of the cutting edge line is 60 mm.
The positioning screws are cylinders metal rods with the diameter of 6 mm and the height of 130 mm. The two positioning screws are symmetrically located on the left side and the right side of the lower blade. The distance between the centers of the two positioning screws is 70 mm, the connection line of the centers is vertically intersected with the cutting edge line of the lower blade, and the distance between the intersection point and the back end of the cutting edge line is 32 mm.
A splitting method of the cylindrical concrete specimen splitting device comprises the following steps: (1), setting a minimum cutting edge space S between the upper blade and the lower blade: determining the minimum cutting edge space S between the upper blade and the lower blade according to the height H of the cylindrical concrete specimen and the splitting depth D of the upper blade into the specimen; ensuring that the numerical scale line on the column guide rail is in one to one correspondence with the minimum cutting edge space S between the upper blade and the lower blade; unscrewing the fastening bolts and the limiting nut; turning off the brake; rotating the flywheel by hands to drive the crank slide block to move to a lower limit position; rotating the rotary plate to drive the slider to move up and down to ensure that the number S of the scale line on the column guide rail is aligned with the top surface of the slider; tightening the fastening bolts and the limiting nut; rotating the flywheel by hands to drive the crank slide block to move to an upper limit position so that the brake is subsequently turned on; (2), placing the specimen: placing the cylindrical concrete specimen on the base plate; and using the push rod to push the specimen to closely abut against the positioning screws; (3), splitting the specimen: pressing down the start button so that the motor starts to drive the flywheel to rotate; pressing down the split button so that the brake is subsequently turned off, the crank slide block moves downwards to drive the upper blade to quickly move downwards so as to shock and split the concrete specimen into two flat portions, wherein the crank slide block moves to the lower limit position and then moves upwards to the upper limit position, at this time, the brake is subsequently turned on, and the crank slide block stops moving; (4), taking out the split specimen: pressing down the stop button so that the motor stops working, then taking out the split specimen.
The depth D(mm) of the upper blade into the concrete specimen is in the range of 1-4 mm.
The minimum cutting edge space S(mm) between the upper blade and the lower blade is equal to the distance between the upper blade at the lower limit position and the lower blade. It can be determined by the formula: S=H-D In the formula, H(mm) is the height of the cylindrical concrete specimen.
Compared with the prior art, the present invention has the following outstanding advantages: 1. The specimen can be stably placed by using the specimen positioning system. The positioning screws are symmetrically arranged so that the upper blade and the lower blade can pass through the centers of the upper surface and the lower surface of the cylindrical concrete specimen and are placed on the same axial section. Therefore, the defect that the specimen is hard to keep horizontal during pressurization of a pressure tester such that the axial section cannot keep vertical to the upper surface and the lower surface of the specimen in the traditional splitting method is avoided.
2. The blade with a triangular cutting edge is used to solve the defect that the contact area of a cushioning strip and the concrete specimen is too large so that the crushed area of the split specimen is too wide and the section of the split specimen is not flat in the traditional splitting method.
3. The blades quickly shock and split the specimen, and the splitting depth of the upper blade is accurately set, thereby solving the defect that the specimen is easy to break due to the fact that the pressurization speed is uneven and the pressurization stopping time is determined by eyes when the pressure tester is operated manually in the traditional splitting method.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic diagram of an integral structure of a cylindrical concrete specimen splitting device of the present invention.
FIG. 2 is a schematic structural diagram of a lead screw sliding rail system of a cylindrical concrete specimen splitting device of the present invention.
FIG. 3 is a back view showing a structure of a lead screw sliding rail system of a cylindrical concrete specimen splitting device of the present invention.
FIG. 4 is a schematic structural diagram of a specimen positioning system of a cylindrical concrete specimen splitting device of the present invention.
FIG. 5 is a schematic structural diagram of a splitting system of a cylindrical concrete specimen splitting device of the present invention.
FIG. 6 is a schematic structural diagram of control switches of a cylindrical concrete specimen splitting device of the present invention.
FIG. 7 is a diagram showing the splitting effect of a cylindrical concrete specimen by using the traditional splitting method.
FIG. 8 is a diagram showing the splitting effect of a cylindrical concrete specimen by using a splitting method of the present invention.
DESCRIPTION OF THE EMBODIMENTS
To make the content of the present invention to be more easily and clearly understood, the following further describes the technical solution of the present invention in detail with reference to the accompanying drawings and embodiments.
As shown in FIG. 1, a cylindrical concrete specimen splitting device of the present invention comprises a lead screw sliding rail system 1, a base 2, a specimen positioning system 3, a splitting system 4 and control switches 5. The lead screw sliding rail system 1 is mounted at the back end of the base 2 while the specimen positioning system 3 is mounted at the front end of the base 2. The splitting system 4 is mounted on the lead screw sliding rail system 1, and the control switches 5 are mounted on the left side of the lead screw sliding rail system 1.
As shown in FIG. 2 and FIG. 3, the lead screw sliding rail system 1 is composed of a lead screw 1.1, a column guide rail 1.2, a rotary plate 1.3, a limiting nut 1.4, a slider 1.5 and fastening bolts 1.6. The lead screw 1.1 is mounted at the middle portion of the column guide rail 1.2. The rotary plate 1.3 is mounted at the upper end of the lead screw 1.1, the limiting nut 1.4 is mounted at the middle portion of the lead screw 1.1, and the slider 1.5 is mounted at the lower end of the lead screw 1.1. The fastening bolts 1.6 are mounted on two ends of the back side of the column guide rail 1.2.
As shown in FIG. 4, the specimen positioning system 3 is composed of a lower blade 3.1, two positioning screws 3.2, two cushioning rubber pads 3.3, a base plate 3.4, a battle 3.5 and a push rod 3.6. The lower blade 3.1 is mounted at the middle portion of the base 2, the two positioning screws 3.2 are respectively mounted on the left side and the right side of the back end of the lower blade 3.1, and the two cushioning rubber pads 3.3 are respectively mounted on the left side and the right side of the middle portion of the lower blade 3.1. The base plate 3.4 is mounted at the front portion of the base 2. The baffle 3.5 is mounted at the front of the base plate 3.4. The push rod 3.6 is mounted at the baffle 3.5.
As shown in FIG. 5, the splitting system 4 is composed of a motor 4.1, a belt 4.2, a flywheel 4.3, a crank slide block 4.4, a brake 4.5 and an upper blade 4.6. The motor 4.1 is connected with the flywheel 4.3 through the belt 4.2. The flywheel 4.3 is mounted at the right end of the crank slide block 4.4. The brake 4.5 is mounted between the crank slide block 4.4 and the flywheel 4.3. The upper blade 4.6 is mounted at the lower end of the crank slide block 4.4. As shown in FIG. 6, the control switches 5 comprise three buttons, namely a start button 5.1, a stop button 5.2 and a split button 5.3, wherein the start button 5.1 and the stop button 5.2 are respectively used for turning on and turning off the motor, and the split button 5.3 is used for driving the crank slide block 4.4 to move vertically.
A splitting method of the cylindrical concrete specimen splitting device comprises the following steps: (1), setting a minimum cutting edge space S between the upper blade and the lower blade: determining S=H-D, wherein S is the minimum cutting edge space between the upper blade and the lower blade, H is the height of the cylindrical concrete specimen, and D is the splitting depth of the upper blade 4.6 into the specimen; ensuring that the numerical scale line on the column guide rail 1.2 is in one-to-one correspondence with the minimum cutting edge space S between the upper blade and the lower blade; unscrewing the fastening bolts 1.6 and the limiting nut 1.4; turning off the brake 4.5; rotating the flywheel 4.3 by hands to drive the crank slide block 4.4 to move to a lower limit position; rotating the rotary plate 1.3 to drive the slider 1.5 to move up and down to ensure that the number S of the scale line on the column guide rail 1.2 is aligned with the top surface of the slider 1.5; tightening the fastening bolts 1.6 and the limiting nut 1.4; rotating the flywheel 4.3 by hands to drive the crank slide block 4.4 to move to an upper limit position so that the brake 4.5 is subsequently turned on; (2), placing the specimen: placing the cylindrical concrete specimen on the base plate 3.4; and using the push rod 3.6 to push the concrete specimen to closely abut against the positioning screws 3.2; (3), splitting the specimen: pressing down the start button 5.1 so that the motor starts to drive the flywheel 4.3 to rotate; pressing down the split button 5.3 so that the brake 4.5 is subsequently turned off, the crank slide block 4.4 moves downwards to drive the upper blade 4.6 to quickly move downwards so as to shock and split the concrete specimen into two flat portions, wherein the crank slide block 4.4 moves to the lower limit position and then moves upwards to the upper limit position, at this time, the brake 4.5 is subsequently turned on, and the crank slide block 4.4 stops moving; (4), taking out the split specimen: pressing down the stop button 5.2 so that the motor stops working, then taking out the split specimen.
Embodiment The present embodiment is a specific embodiment for verifying the effectiveness of the device and the method of the present invention. Specifically, according to the cylindrical concrete specimen splitting device and the splitting method, the splitting depth D of the upper blade into the specimen is set to 2 mm; total 14 cylindrical concrete specimens, each with the diameter of 100 mm, the height H of 50 mm and the strength grade in the range of C35-055, are split.
FIG. 7 is a diagram showing the splitting effect of a cylindrical concrete specimen by using the traditional splitting method. FIG. 8 is a diagram showing the splitting effect of a cylindrical concrete specimen by using a splitting method of the present invention. Based on the diagrams, it can be intuitively determined that the section flatness of the cylindrical concrete specimen split by using the present invention is greatly better than that of the specimen split by using the traditional splitting method. The sections of the 14 cylindrical concrete specimens with the strength grades in the range of C35-055 split by using the present invention are totally similar to the sections shown in FIG. 6,thereby verifying the general applicability and the effectiveness of the device and the method of the present invention in different grades of the concrete specimens.
Claims (7)
- Claims WHAT IS CLAIMED IS: 1. A cylindrical concrete specimen splitting device, comprising a lead screw sliding rail system, a base, a specimen positioning system, a splitting system and control switches, wherein the specific structure and the connection relationship of the cylindrical concrete specimen splitting device are as follows: the lead screw sliding rail system is mounted at the back end of the base while the specimen positioning system is mounted at the front end of the base; the splitting system is mounted on the lead screw sliding rail system, and the control switches are mounted on the left side of the lead screw sliding rail system; the lead screw sliding rail system is composed of a lead screw, a column guide rail, a rotary plate, a limiting nut, a slider and fastening bolts; the lead screw is mounted at the middle portion of the column guide rail; the rotary plate is mounted at the upper end of the lead screw, the limiting nut is mounted at the middle portion of the lead screw, and the slider is mounted at the lower end of the lead screw; the fastening bolts are mounted on two ends of the back side of the column guide rail; the specimen positioning system is composed of a lower blade, two positioning screws, two cushioning rubber pads, a base plate, a baffle and a push rod; the lower blade is mounted at the middle portion of the base, the two positioning screws are respectively mounted on the left side and the right side of the back end of the lower blade, and the two cushioning rubber pads are respectively mounted on the left side and the right side of the middle portion of the lower blade; the base plate is mounted at the front portion of the base; the baffle is mounted at the front of the base plate; the push rod is mounted at the baffle; the splitting system is composed of a motor, a belt, a flywheel, a crank slide block, a brake and an upper blade; the motor is connected with the flywheel through the belt; the flywheel is mounted at the right end of the crank slide block; the brake is mounted between the crank slide block and the flywheel; the upper blade is mounted at the lower end of the crank slide block; the control switches comprise three buttons, namely a start button, a stop button and a split button, wherein the start button and the stop button are respectively used for turning on and turning off the motor, and the split button is used for driving the crank slide block to move 30 vertically.
- 2. The cylindrical concrete specimen splitting device according to claim I, wherein each of the upper blade and the lower blade is a triangle-square combination with the length of 150 mm, the height of 31 mm and the bottom surface width of 20 mm; the upper blade is mounted at the lower end of the crank slide block, and its cutting edge line faces outwards; the cutting edge line of the lower blade and the cutting edge line of the upper blade are located in the same vertical plane and are parallel with each other.
- 3. The cylindrical concrete specimen splitting device according to claim 1, wherein the cushioning rubber pads are cylinders with the diameter of 35 mm and the height of 30 mm; the two cushioning rubber pads are symmetrically located on the left side and the right side of the lower blade; the distance between the centers of the two cylindrical cushioning rubber pads is mm, the connection line of the centers is vertically intersected with the cutting edge line of the lower blade, and the distance between the intersection point and the back end of the cutting edge line is 60 mm.
- 4. The cylindrical concrete specimen splitting device according to claim 1, wherein the positioning screws are cylinders metal rods with the diameter of 6 mm and the height of 130 mm; the two positioning screws are symmetrically located on the left side and the right side of the lower blade; the distance between the centers of the two positioning screws is 70 mm, the connection line of the centers is vertically intersected with the cutting edge line of the lower blade, and the distance between the intersection point and the back end of the cutting edge line is 32 mm.
- 5. A splitting method of the cylindrical concrete specimen splitting device according to claim 1, comprising the following steps: (1), setting a minimum cutting edge space S between the upper blade and the lower blade: determining the minimum cutting edge space S between the upper blade and the lower blade according to the height H of the cylindrical concrete specimen and the splitting depth D of the upper blade into the specimen; ensuring that the numerical scale line on the column guide rail is in one to one correspondence with the minimum cutting edge space S between the upper blade and the lower blade; unscrewing the fastening bolts and the limiting nut; turning off the brake; rotating the flywheel by hands to drive the crank slide block to move to a lower limit position; rotating the rotary plate to drive the slider to move up and down to ensure that the number S of the scale line on the column guide rail is aligned with the top surface of the slider; tightening the fastening bolts and the limiting nut; rotating the flywheel by hands to drive the crank slide block to move to an upper limit position so that the brake is subsequently turned on; (2), placing the specimen: placing the cylindrical concrete specimen on the base plate; and using the push rod to push the specimen to closely abut against the positioning screws; (3), splitting the specimen: pressing down the start button so that the motor starts to drive the flywheel to rotate; pressing down the split button so that the brake is subsequently turned off, the crank slide block moves downwards to drive the upper blade to quickly move downwards so as to shock and split the concrete specimen into two flat portions, wherein the crank slide block moves to the lower limit position and then moves upwards to the upper limit position, at this time, the brake is subsequently turned on, and the crank slide block stops moving; (4), taking out the split specimen: pressing down the stop button so that the motor stops working, then taking out the split specimen.
- 6. The splitting method of the cylindrical concrete specimen splitting device according to claim 5, wherein the splitting depth D(mm) of the upper blade into the concrete specimen is in the range of 1-4 mm.
- 7. The splitting method of the cylindrical concrete specimen splitting device according to claim 5, wherein the minimum cutting edge space S(mm) between the upper blade and the lower blade is equal to the distance between the upper blade at the lower limit position and the lower blade, 10 and can be determined by the formula: S=H-D; In the formula, H(mm) is the height of the cylindrical concrete specimen.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910285794.3A CN110057698B (en) | 2019-04-10 | 2019-04-10 | Cylinder concrete test block splitting device and splitting method |
Publications (4)
| Publication Number | Publication Date |
|---|---|
| GB202005194D0 GB202005194D0 (en) | 2020-05-20 |
| GB2585436A true GB2585436A (en) | 2021-01-13 |
| GB2585436A8 GB2585436A8 (en) | 2021-04-28 |
| GB2585436B GB2585436B (en) | 2024-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2005194.2A Active GB2585436B (en) | 2019-04-10 | 2020-04-08 | Cylindrical concrete specimen splitting device and splitting method |
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| Country | Link |
|---|---|
| CN (1) | CN110057698B (en) |
| GB (1) | GB2585436B (en) |
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| CN112268774B (en) * | 2020-11-11 | 2022-05-24 | 石家庄铁道大学 | Sample preparation device and process for mechanical test of frozen soil and concrete contact surface |
| CN113607517B (en) * | 2021-07-30 | 2024-02-20 | 武汉理工大学 | Soil sample cylinder test piece preparation instrument and working method thereof |
| CN114197383B (en) * | 2021-12-30 | 2023-06-02 | 中国水利水电第十二工程局有限公司 | Device and method for dismantling second-stage concrete of gate slot of hydraulic and hydroelectric engineering |
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Also Published As
| Publication number | Publication date |
|---|---|
| GB2585436B (en) | 2024-02-07 |
| GB2585436A8 (en) | 2021-04-28 |
| GB202005194D0 (en) | 2020-05-20 |
| CN110057698A (en) | 2019-07-26 |
| CN110057698B (en) | 2024-04-09 |
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