CN111829883A - Solid concrete compressive strength czochralski method detection device - Google Patents
Solid concrete compressive strength czochralski method detection device Download PDFInfo
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- CN111829883A CN111829883A CN201910320520.3A CN201910320520A CN111829883A CN 111829883 A CN111829883 A CN 111829883A CN 201910320520 A CN201910320520 A CN 201910320520A CN 111829883 A CN111829883 A CN 111829883A
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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- 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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- 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
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- 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
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- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0266—Cylindrical specimens
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- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
Abstract
A device for detecting the compression strength of solid concrete by a Czochralski method comprises a Czochralski sample positioned in the solid concrete, and a cuboid steel pressure head, a spherical support, a miniature screw oil jack and a cuboid counter-force steel plate are sequentially arranged on the Czochralski sample; l-shaped counter-force steel pull feet which can hook the top pull sample face to face are symmetrically arranged on the short edges of the two sides of the cuboid counter-force steel plate; the cuboid counter-force steel plate and the L-shaped counter-force steel pull foot cover the cuboid steel pressure head, the spherical support and the micro screw hydraulic jack; the longitudinal axes of the jacking sample, the cuboid steel pressure head, the spherical support, the miniature screw oil jack and the cuboid counter-force steel plate are coaxial. According to the invention, the top-pull sample in the solid concrete is hooked through the L-shaped counter-force steel pull foot, the top-pull force is applied on the top-pull sample through the long square steel pressure head, the spherical support, the micro screw oil jack and the cuboid counter-force steel plate until the top-pull sample is damaged, the maximum top-pull force value is read, and the concrete compressive strength is estimated according to a conversion formula established between the concrete compressive strength and the top-pull force value.
Description
Technical Field
The invention relates to a device for detecting the compressive strength of solid concrete by a top pulling method.
Background
The compressive strength is one of important performance parameters of concrete, and is directly related to the quality safety and normal use of concrete members and even the whole engineering. Therefore, it is a very important task to measure the compressive strength of concrete.
In the prior art, there are many common methods for detecting the compressive strength of concrete, which are as follows: (1) a shearing and pressing method. The concrete shear-compression instrument is utilized to apply pressure perpendicular to the pressure bearing surface to the surface of the right-angle side of the concrete member, so that the right-angle side of the concrete member generates local shear-compression damage, and the compressive strength of the concrete member is estimated according to the shear pressure at the moment. The method has the following defects: the method is not suitable for detecting the compressive strength of the cylindrical concrete members (such as cylinders, concrete culvert pipes and the like), and the detection practicability is influenced. (2) Core drilling method. And drilling a concrete test piece on the concrete member, processing the concrete test piece into a standard core sample, and detecting the compressive strength of the standard core sample on a pressure testing machine. The detection method has the following defects: the manufactured standard core sample size of 100 mm is relatively large in breakage degree and high in repairing requirement, so that the detection practicability is influenced. (3) Rebound method. And estimating the compressive strength of the concrete member according to the relationship between the surface hardness and the strength of the concrete member. The detection method has the following defects: the method is not suitable for detecting the compressive strength of cylindrical concrete members (such as cylinders, concrete culvert pipes and the like) with the curvature radius less than or equal to 250mm, and the detection practicability is influenced. (4) An ultrasonic rebound synthesis method. The compressive strength of the concrete is estimated based on the hardness of the surface of the concrete member and the ultrasonic wave velocity in the concrete member. The detection method has the following defects: the method is not suitable for detecting the compressive strength of cylindrical concrete members (such as cylinders, concrete culvert pipes and the like) with the curvature radius less than or equal to 250mm, and the detection practicability is influenced. (5) And (4) a drawing-out method. The compressive strength of the concrete is estimated according to the pulling-out force of the concrete member when the concrete member is damaged within the range of 30mm of the surface layer of the concrete member. The detection method has the following defects: the detection process needs complex drilling and groove grinding procedures, needs smooth surface, is not suitable for detecting the compressive strength of cylindrical concrete members (such as cylinders, concrete culvert pipes and the like) with the curvature radius of less than or equal to 250mm, and influences the detection practicability. (6) A pull-off method. Drilling a core sample test piece with the thickness of 44 mm and the depth of 44 mm on the hardened concrete member, carrying out a pull-off test by using a device with an automatic clamping test piece, and estimating the compressive strength of the concrete according to the pull-off strength value of the core sample test piece. The detection method has the following defects: when the stress of the pull-off test piece is calculated, the diameter size of the position close to the fracture part of the test piece and perpendicular to each other needs to be measured, and the diameter of the test piece is small, so that accurate measurement is difficult, and the detection accuracy is affected.
In summary, the above detection methods have the problem that the compressive strength of cylindrical concrete members (such as cylinders, concrete culvert pipes, etc.) with the curvature radius less than or equal to 250mm cannot be effectively detected, so design improvement is required.
Disclosure of Invention
The invention provides a detection device for the compression strength of concrete by a Czochralski method, which has the advantages of reasonable design, strong practicability and accurate detection, and also provides a detection method adopting the detection device. . The device and the detection method can solve the problem that the compressive strength of cylindrical concrete members (such as columns, concrete culvert pipes and the like) with the curvature radius of less than or equal to 250mm cannot be effectively detected by various detection methods for the compressive strength of the concrete of the prior entity.
The technical scheme adopted by the invention is as follows: a device for detecting the compression strength of solid concrete by a Czochralski method comprises a Czochralski sample positioned in the solid concrete, and a cuboid steel pressure head, a spherical support, a miniature screw oil jack and a cuboid counter-force steel plate are sequentially arranged on the Czochralski sample; l-shaped counter-force steel pull feet which can hook the top pull sample face to face are symmetrically arranged on the short edges of the two sides of the cuboid counter-force steel plate; the cuboid counter-force steel plate and the L-shaped counter-force steel pull foot cover the cuboid steel pressure head, the spherical support and the micro screw hydraulic jack; the longitudinal axes of the jacking sample, the cuboid steel pressure head, the spherical support, the miniature screw oil jack and the cuboid counter-force steel plate are coaxial. According to the invention, a top-pull sample in solid concrete is hooked through an L-shaped counter-force steel pull foot, then a top pull force is applied on the top-pull sample through a long square steel pressure head, a spherical support, a micro screw oil jack and a cuboid counter-force steel plate until the top-pull sample is damaged, the maximum top-pull value is read, and the concrete compressive strength is estimated according to a conversion formula established between the concrete compressive strength and the top-pull value.
Further, the top pulling sample comprises a lower cuboid, a middle square body and an upper cambered body; the long edge of the cuboid at the lower part is 100 mm, the short edge (78-79) mm and the high edge (11-21) mm, the lower surface is connected with the solid concrete, the upper surface is connected with the lower surface of the square body at the middle part, the side surface is parallel to the axial section of the solid concrete, the end surface is parallel to the radial section of the solid concrete, and the longitudinal axis is positioned in the axial section of the solid concrete; the side length of the middle square body is 100 mm, the lower surface of the middle square body is connected with the upper surface of the lower cuboid, and the upper surface of the middle square body is connected with the lower surface of the upper bow body in a superposed manner; the lower surface of the upper arched body is connected with the upper surface of the middle square body in a superposition mode, the upper surface of the upper arched body is in abutting contact with the lower surface of the rectangular steel pressure head, 2 positioning grooves with the width of 1mm and the depth of 1mm are symmetrically distributed in the middle of the upper surface of the rectangular steel pressure head in the direction parallel to the axial section, the side walls of the 2 positioning grooves are parallel to the side face of the middle square body, the distance between the inner walls of the 2 positioning grooves is 20 mm, and the vertical distance from the.
Further, the long edge of the cuboid steel pressure head is 100 mm, the short edge of the cuboid steel pressure head is 20 mm, the thickness of the cuboid steel pressure head is 10-20 mm, the end face of the cuboid steel pressure head is coplanar with the end face of the bow-shaped body, the lower surface of the cuboid steel pressure head is in contact with the upper surface of the bow-shaped body of the push-pull sample, and the center of the upper surface of the cuboid steel pressure head is connected with the head of.
Furthermore, a screw sleeve perpendicular to the longitudinal axis of the micro screw hydraulic jack is connected to the circumferential side face of the micro screw hydraulic jack, a screw is arranged in the screw sleeve, and a T-shaped sleeve wrench applying jacking tension is installed at the end head of the screw; the circumferential side surface of the micro screw oil jack is also connected with a digital pressure gauge; the tail part of the micro screw oil jack is fixedly connected with the cuboid counter-force steel plate.
Further, the rectangular parallelepiped reaction force steel plate has a long side (120-140 mm), a short side (100 mm) and a thickness (10-20) mm; the short edge edges on both sides are evenly drilled with 3 connecting round holes which are used for being connected with two L-shaped counter-force steel pull feet.
Further, the L-shaped counter force steel pull foot comprises a lower cuboid and an upper cuboid; the outer side of the upper surface of the lower cuboid is fixedly connected with the lower surface of the upper cuboid; the long edge of the lower cuboid is 100 mm, the high edge is (10-20) mm, the side surface of the lower cuboid is parallel to the side surface of the lower cuboid of the top-pulling sample, and the end surface of the lower cuboid of the top-pulling sample are positioned on the same plane; the long edge of the upper cuboid is 100 mm, the short edge is (10-20) mm, the high edge (30 + the thickness of the cuboid steel pressure head + the height of the spherical support and the height of the micro screw hydraulic jack) is parallel to the side surface of the lower cuboid of the top-pulling sample, and the end surface of the upper cuboid is in the same plane with the end surface of the lower cuboid of the top-pulling sample; 3 connecting screw holes corresponding to the connecting round holes are drilled on the upper surface of the upper cuboid, and connecting bolts can penetrate through the connecting round holes and screwed into the connecting screw holes; the distance from the inner side surface of the lower cuboid to the inner side surface of the upper cuboid is 10 mm; the distance between the inner sides of the two face-to-face lower cuboids is 80 mm.
The invention has the beneficial effects that: (1) in the detection process, the detection device is used for applying the top tension to the concrete, the maximum top tension value is measured, the compressive strength of the concrete is estimated according to a conversion formula established between the compressive strength of the concrete and the top tension value, the design is reasonable, the practicability is high, and the detection is accurate. (2) The method solves the problem that the compressive strength of cylindrical concrete members (such as cylinders, concrete culvert pipes and the like) with curvature radius less than or equal to 250mm cannot be effectively detected by the conventional solid concrete compressive strength shearing method, coring method, rebound method, ultrasonic-rebound method, pulling-out method and the like.
Drawings
Fig. 1 is a schematic front view of the present invention in use.
Figure 2 is a schematic cross-sectional view of the present invention using a-a.
Figure 3 is a schematic cross-sectional view of the present invention using b-b.
Fig. 4 is a plan view schematically illustrating the auxiliary steel bracket of the present invention.
Fig. 5 is a schematic cutting view of the operating slot of the present invention.
Fig. 6 is a schematic view of the operation slot grinding of the present invention.
Fig. 7 is a schematic view of a detent cut 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. 1-7, a device for detecting the compressive strength of solid concrete by the czochralski method comprises a czochralski sample 15 positioned in solid concrete 13, and a cuboid steel pressure head 16, a spherical support 10, a micro screw oil jack 2 and a cuboid counter-force steel plate 1 are sequentially arranged on the czochralski sample; l-shaped counter-force steel pull feet 11 which can hook the top pull sample 15 face to face are symmetrically arranged on the short sides of the two sides of the cuboid counter-force steel plate 1; the cuboid counter-force steel plate 1 and the L-shaped counter-force steel pull foot 11 together cover the cuboid steel pressure head 16, the spherical support 10 and the micro screw hydraulic jack 2; and the longitudinal axes of the jacking and pulling sample 15, the cuboid steel pressure head 16, the spherical support 10, the micro screw oil jack 2 and the cuboid counter force steel plate 1 are coaxial. According to the invention, a top-pull sample 15 in solid concrete 13 is hooked by an L-shaped counter-force steel pull foot 11, then a top-pull force is applied to the top-pull sample 15 by a long square steel pressure head 16, a spherical support 10, a micro screw oil pressure jack 2 and a rectangular counter-force steel plate 1 until the top-pull sample 15 is damaged, the maximum top-pull force value is read, and the concrete compressive strength is estimated according to a conversion formula established between the concrete compressive strength and the top-pull force value.
The solid concrete 13 of this embodiment is a cylinder having a diameter of 400 mm.
The top-pulling sample 15 of the embodiment includes a lower cuboid, a middle square body and an upper bow body; the long edge of the lower cuboid is 100 mm, the short edge of the lower cuboid is 78 mm, and the high edge of the lower cuboid is 15 mm, the lower surface of the lower cuboid is connected with the solid concrete, the upper surface of the lower cuboid is connected with the lower surface of the middle square body, the side surface of the lower cuboid is parallel to the axial section of the cylindrical concrete, the end surface of the lower cuboid is parallel to the radial section of the solid concrete, and the longitudinal axis of the lower cuboid is; the side length of the middle square body is 100 mm, the high side is 24 mm, the lower surface of the middle square body is connected with the upper surface of the lower cuboid, and the upper surface of the middle square body is connected with the lower surface of the upper bow body in an overlapped mode; the lower surface of the upper arched body is connected with the upper surface of the middle square body in a superposition mode, the upper surface of the upper arched body is in abutting contact with the lower surface of the rectangular steel pressure head, 2 positioning grooves with the width of 1mm and the depth of 1mm are symmetrically distributed in the middle of the upper surface of the rectangular steel pressure head in the direction parallel to the axial section, the side walls of the 2 positioning grooves are parallel to the side face of the middle square body, the distance between the inner walls of the 2 positioning grooves is 20 mm, and the vertical distance from the.
In this embodiment, the rectangular steel pressure head 16 has a long side of 100 mm, a short side of 20 mm, and a thickness of 12 mm, the end surface is coplanar with the end surface of the bow-shaped body, the lower surface is in contact with the upper surface of the bow-shaped body, and the center of the upper surface is connected with the head of the miniature screw hydraulic jack 2 through the spherical support 10.
In the embodiment, a threaded sleeve 8 which is vertical to the longitudinal axis of the micro screw hydraulic jack 2 is connected to the circumferential side surface of the micro screw hydraulic jack 2, a screw 9 is arranged in the threaded sleeve 8, and a T-shaped sleeve wrench 7 for applying a jacking force is installed at the end of the screw 9; the circumferential side surface of the miniature screw oil jack 2 is also connected with a digital pressure gauge 6; the tail part of the micro screw oil jack 2 is fixedly connected with the cuboid counter-force steel plate 1.
In the rectangular parallelepiped reaction force steel plate 1 of the present embodiment, the long side is 128 mm, the short side is 100 mm, and the thickness is 14 mm; and 3 connecting round holes 4 for connecting with the two L-shaped counterforce steel pull feet 11 are uniformly drilled on the edges of the short edges at the two sides, and the aperture is 9 mm.
The L-shaped reaction steel foot 11 of the present embodiment includes a lower rectangular parallelepiped and an upper rectangular parallelepiped; the outer side of the upper surface of the lower cuboid is fixedly connected with the lower surface of the upper cuboid; the long edge of the lower cuboid is 100 mm, the high edge is 14 mm, the side surface of the lower cuboid is parallel to the side surface of the lower cuboid of the top-pulling sample, and the end surface of the lower cuboid of the top-pulling sample is positioned on the same plane; the long edge of the upper cuboid is 100 mm, the short edge of the upper cuboid is 14 mm, and the high edge of the upper cuboid is 140 mm, the side surface of the upper cuboid is parallel to the side surface of the lower cuboid of the top-pulling sample, and the end surface of the upper cuboid is in the same plane with the end surface of the lower cuboid of the top-pulling sample; 3 connecting screw holes 5 corresponding to the connecting round holes 4 are drilled in the upper surface of the upper cuboid, and the specification is 8 mm, so that the M8 connecting bolt 3 can penetrate through the connecting round holes 4 and can be screwed into the connecting screw holes 5; the distance from the inner side surface of the lower cuboid to the inner side surface of the upper cuboid is 10 mm; the distance between the inner sides of the two face-to-face lower cuboids is 80 mm.
The detection steps of this embodiment are as follows: (1) the handle 20 on the auxiliary steel bracket 19 is grasped by hands, so that the two support legs 23 are pressed against the surface of the solid concrete 13; (2) adopting a portable concrete cutting machine 17 provided with 3 cutting pieces 22 (the total distance is 30 mm), adjusting the depth of the cutting pieces 22, horizontally placing the concrete cutting machine 17 on the upper surface of the auxiliary steel bracket 19, enabling the cutting pieces 22 to penetrate through the cutting openings 21 of the axial operation groove, axially moving and cutting the solid concrete 13 to form the operation groove 12 with the inner wall depth of 39mm and the width of 30mm, chiseling the concrete in the operation groove 12 and polishing the bottom of the groove to be flat; (3) adopting a portable concrete cutting machine 17 provided with a single cutting piece 22, adjusting the depth of the cutting piece 22, horizontally placing the concrete cutting machine 17 on the upper surface of the auxiliary steel bracket 19, enabling the cutting piece 22 to penetrate through the axial positioning groove cutting opening 18, and axially moving and cutting the solid concrete 13 to form a positioning groove 14 with the depth of 1mm and the width of 1 mm; (4) adopting an angle grinder 24, adjusting the length of an extension bar 26, installing the extension bar 26 and a sintering grinding head 25, enabling the distance from the outer edge of the extension bar 26 to the outer edge of the sintering grinding head 25 to be 11mm, horizontally placing the angle grinder 24 on the upper surface of an auxiliary steel bracket 19, enabling the extension bar 26 to penetrate through an axial operation groove cutting opening 21 and to be tightly attached to the inner wall of an operation groove 12, and axially moving and grinding concrete on the inner wall of the operation groove 12; (5) adopting a portable concrete cutting machine 17 provided with a single cutting piece 22, adjusting the depth of the cutting piece 22, horizontally placing the concrete cutting machine 17 on the upper surface of an auxiliary steel bracket 19, axially moving the auxiliary steel bracket 19, enabling the cutting piece 22 to penetrate through a radial positioning groove cutting opening 27, radially moving and cutting the solid concrete 13, and forming a top-pulling sample 15, wherein the cutting depth is 45 mm; (6) removing the auxiliary steel bracket 19, and extending two L-shaped reaction steel pull feet 11 into the operation groove 12 to hook the top pull sample 15; (7) a cuboid steel pressure head 16, a spherical support 10, a miniature screw oil jack 2 and a cuboid counter-force steel plate 1 are sequentially arranged on the jacking and pulling sample 15, and a connecting bolt 3 penetrates through a connecting circular hole 4 and is screwed into a connecting screw hole 5 to be tightened; (8) the T-shaped sleeve wrench 7 is sleeved on the end head of the screw rod 9, the screw rod 9 is continuously and uniformly rotated to apply force, the cuboid steel pressure head 16 tightly props up the upper surface of the jacking-pulling sample 15, meanwhile, the L-shaped counter-force steel pull foot 11 is driven by the cuboid counter-force steel plate 1 to move upwards relative to the jacking-pulling sample 15 until the jacking-pulling sample 15 is damaged, the maximum jacking-pulling force value is read, and the concrete compressive strength is estimated according to a conversion formula established between the concrete compressive strength and the jacking-pulling force value.
In this embodiment, the conversion formula is as follows:
Yi=AXi+B
wherein: yi is a converted value (MPa) of the compressive strength of the ith concrete 13 during detection; xi is the maximum value of the top tension (N) applied to the i-th solid concrete 13 at the time of detection; A. and B is the regression coefficient of the regression equation.
Of course, the conversion formula of the concrete compressive strength and the jacking force value may be other than the above formula, and is not limited to the above formula.
Claims (7)
1. The utility model provides a solid concrete compressive strength czochralski method detection device which characterized in that: the device comprises a top-pulling sample positioned in solid concrete, and a cuboid steel pressure head, a spherical support, a miniature screw oil jack and a cuboid counter-force steel plate are sequentially arranged on the top-pulling sample; l-shaped counter-force steel pull feet which can hook the top pull sample face to face are symmetrically arranged on the short edges of the two sides of the cuboid counter-force steel plate; the cuboid counter-force steel plate and the L-shaped counter-force steel pull foot cover the cuboid steel pressure head, the spherical support and the micro screw hydraulic jack; the longitudinal axes of the jacking sample, the cuboid steel pressure head, the spherical support, the miniature screw oil jack and the cuboid counter-force steel plate are coaxial.
2. The device for detecting the top-pulling method of the compressive strength of the concrete according to claim 1, wherein: the top pulling sample comprises a lower cuboid, a middle square body and an upper arc body; the long edge of the cuboid at the lower part is 100 mm, the short edge (78-79) mm and the high edge (11-21) mm, the lower surface is connected with the solid concrete, the upper surface is connected with the lower surface of the square body at the middle part, the side surface is parallel to the axial section of the solid concrete, the end surface is parallel to the radial section of the solid concrete, and the longitudinal axis is positioned in the axial section of the solid concrete; the side length of the middle square body is 100 mm, the lower surface of the middle square body is connected with the upper surface of the lower cuboid, and the upper surface of the middle square body is connected with the lower surface of the upper bow body in a superposed manner; the lower surface of the upper arched body is connected with the upper surface of the middle square body in a superposition mode, the upper surface of the upper arched body is in abutting contact with the lower surface of the rectangular steel pressure head, 2 positioning grooves with the width of 1mm and the depth of 1mm are symmetrically distributed in the middle of the upper surface of the rectangular steel pressure head in the direction parallel to the axial section, the side walls of the 2 positioning grooves are parallel to the side face of the middle square body, the distance between the inner walls of the 2 positioning grooves is 20 mm, and the vertical distance from the.
3. The device for detecting the top-pulling method of the compressive strength of the concrete according to claim 2, wherein: the long edge of the cuboid steel pressure head is 100 mm, the short edge of the cuboid steel pressure head is 20 mm, the thickness of the cuboid steel pressure head is 10-20 mm, the end face of the cuboid steel pressure head is coplanar with the end face of the bow-shaped body, the lower surface of the cuboid steel pressure head is in contact with the upper surface of the bow-shaped body of the push-pull sample, and the center of the upper surface of the cuboid steel pressure head is connected with the head.
4. The device for detecting the top-pulling method of the compressive strength of the concrete according to claim 3, wherein: the side surface of the circumference of the micro screw rod oil pressure jack is connected with a threaded sleeve which is vertical to the longitudinal axis of the micro screw rod oil pressure jack, a screw rod is arranged in the threaded sleeve, and a T-shaped sleeve wrench for applying jacking force is arranged at the end head of the screw rod; the circumferential side surface of the micro screw oil jack is also connected with a digital pressure gauge; the tail part of the micro screw oil jack is fixedly connected with the cuboid counter-force steel plate.
5. The device for detecting the top-pulling method of the compressive strength of the concrete according to claim 4, wherein: the rectangular counter-force steel plate has a long side (120-140 mm), a short side (100 mm) and a thickness (10-20) mm; the short edge edges on both sides are evenly drilled with 3 connecting round holes which are used for being connected with two L-shaped counter-force steel pull feet.
6. The device for detecting the top-pulling method of the compressive strength of the concrete according to claim 5, wherein: the L-shaped counter force steel pull foot comprises a lower cuboid and an upper cuboid; the outer side of the upper surface of the lower cuboid is fixedly connected with the lower surface of the upper cuboid; the long edge of the lower cuboid is 100 mm, the high edge is (10-20) mm, the side surface of the lower cuboid is parallel to the side surface of the lower cuboid of the top-pulling sample, and the end surface of the lower cuboid of the top-pulling sample are positioned on the same plane; the long edge of the upper cuboid is 100 mm, the short edge is (10-20) mm, the high edge (30 + the thickness of the cuboid steel pressure head + the height of the spherical support and the height of the micro screw hydraulic jack) is parallel to the side surface of the lower cuboid of the top-pulling sample, and the end surface of the upper cuboid is in the same plane with the end surface of the lower cuboid of the top-pulling sample; 3 connecting screw holes corresponding to the connecting round holes are drilled on the upper surface of the upper cuboid, and connecting bolts can penetrate through the connecting round holes and screwed into the connecting screw holes; the distance from the inner side surface of the lower cuboid to the inner side surface of the upper cuboid is 10 mm; the distance between the inner sides of the two face-to-face lower cuboids is 80 mm.
7. A detection method of a detection device for a concrete compression strength top pulling method comprises the following detection steps: (1) the handle on the auxiliary steel bracket is grasped by hands, so that the two support legs are pressed on the surface of the solid concrete; (2) adopting a portable concrete cutting machine provided with 3 cutting pieces (the total distance is 30 mm), adjusting the depth of the cutting pieces, horizontally placing the concrete cutting machine on the upper surface of the auxiliary steel bracket, enabling the cutting pieces to penetrate through the cutting openings of the axial operation groove, axially moving and cutting solid concrete to form an operation groove with the inner wall depth of 39mm and the width of 30mm, chiseling the concrete in the operation groove and polishing the bottom of the groove to be flat; (3) the portable concrete cutting machine provided with a single cutting piece is adopted, the depth of the cutting piece is adjusted, the concrete cutting machine is horizontally placed on the upper surface of the auxiliary steel bracket, the cutting piece penetrates through the cutting opening of the axial positioning groove, and the solid concrete is axially moved and cut to form the positioning groove with the depth of 1mm and the width of 1 mm; (4) adopting an angle grinder, adjusting the length of an extension bar, installing the extension bar and a sintering grinding head, keeping the distance from the outer edge of the extension bar to the outer edge of the sintering grinding head to be 11mm, horizontally placing the angle grinder on the upper surface of an auxiliary steel bracket, enabling the extension bar to penetrate through a cutting opening of an axial operation groove and to be tightly attached to the inner wall of the operation groove, and axially moving and grinding concrete on the inner wall of the operation groove; (5) adopting a portable concrete cutting machine provided with a single cutting piece, adjusting the depth of the cutting piece, horizontally placing the concrete cutting machine on the upper surface of an auxiliary steel bracket, axially moving the auxiliary steel bracket, enabling the cutting piece to penetrate through a cutting opening of a radial positioning groove, radially moving and cutting solid concrete, and forming a top-pulling sample with the cutting depth of 45 mm; (6) removing the auxiliary steel bracket, and extending two L-shaped counter-force steel pull feet into the operation groove to hook the top pull sample; (7) a cuboid steel pressure head, a spherical support, a micro screw oil jack and a cuboid counter-force steel plate are sequentially arranged on the jacking and pulling sample, and a connecting bolt penetrates through a connecting circular hole to be screwed into a connecting screw hole and is screwed tightly; (8) sleeving a T-shaped sleeve wrench on the end head of a screw rod, continuously and uniformly rotating the screw rod to apply force to enable a cuboid steel pressure head to tightly push the upper surface of a jacking-pulling sample, driving an L-shaped counter-force steel pull foot to move upwards relative to the jacking-pulling sample through a cuboid counter-force steel plate until the jacking-pulling sample is damaged, reading a maximum jacking-pulling force value, and estimating the compressive strength of the concrete according to a conversion formula established between the compressive strength of the concrete and the jacking-pulling force value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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