CN114088514A - Clamp for concrete axial tensile test - Google Patents
Clamp for concrete axial tensile test Download PDFInfo
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- CN114088514A CN114088514A CN202111384683.1A CN202111384683A CN114088514A CN 114088514 A CN114088514 A CN 114088514A CN 202111384683 A CN202111384683 A CN 202111384683A CN 114088514 A CN114088514 A CN 114088514A
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- 238000009864 tensile test Methods 0.000 title abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 129
- 239000010959 steel Substances 0.000 claims abstract description 129
- 238000000034 method Methods 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 8
- 238000012360 testing method Methods 0.000 claims description 82
- 238000004154 testing of material Methods 0.000 description 13
- 238000001514 detection method Methods 0.000 description 9
- 238000002360 preparation method Methods 0.000 description 9
- 230000008859 change Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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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
- G01N3/02—Details
- G01N3/04—Chucks
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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
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
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Abstract
The invention discloses a clamp for a concrete axial tensile test, which relates to the field of constructional engineering and comprises a clamp steel frame I and a clamp steel frame II; the two clamp steel frames are arranged in a front-back opposite mode, an upper top plate is arranged between the upper ends of the two clamp steel frames, and a connecting rod is fixedly installed in the center of the upper top plate; the lower ends of the left sides of the two clamp steel frames are fixedly connected through a left lower screw and a fastening nut, and the right sides are the same; the hollow round roller in screw rod overcoat left side under the left side installs left side wedge anchor clamps between the left side of two anchor clamps steelframes, promptly: the left side lower part of the clamp steel frame I is provided with a left side fixed cylinder I, the clamp steel frame II is arranged in the same way, the front end face and the rear end face of the left side wedge-shaped clamp are symmetrically provided with a slideway I, the left side wedge-shaped clamp is supported on the left side fixed cylinder I and the left side fixed cylinder II through the slideways I arranged on the front end face and the rear end face, and the inclined side face of the left side wedge-shaped clamp abuts against the left side hollow round roller; and similarly, the arrangement mode of the slide I and the slide II enables the left and right wedge-shaped clamps to be gradually close to each other in the downward movement process.
Description
Technical Field
The invention relates to the field of constructional engineering, in particular to an axial tensile test tool for a concrete test piece, and specifically relates to a clamp for an axial tensile test of concrete.
Background
The tensile property of the concrete plays an important dominating role on the safety of a concrete structure, the axial tensile test of the concrete is to measure the axial tensile strength, the ultimate tensile value and the tensile elastic modulus of the concrete by adopting a method for directly stretching a test piece, is one of the most direct, most objective and most effective methods for measuring a concrete tensile stress-strain full curve, and is specified in national or industrial standards such as GB/T50081 + 2019, Hydraulic engineering concrete test Specification SL 352 + 2019 and the like, but in the existing detection method, a detection device has large mass and volume, complex installation structure, heavy mass of the test piece, high difficulty in test operation, easy occurrence of the phenomenon of end slipping of the test piece and the like, and various detection methods such as a pull ring type and the like are given in the standard Specification, The pull rod type and splayed test mode methods and the epoxy resin bonding method suitable for the drill core sample have the unified defects, and are matched with the defects of the existing clamp in the market of the methods, namely the requirements on the sample are high, the sample preparation link is complicated, the used test piece needs to use a special mould or special manufacture, the operation difficulty of the test is greatly increased, the problem of the distance between the fracture position and the variable cross section turning point or the end point of an embedded piece can be caused, the test data can not be adopted, the difference generated in the preparation of the test piece can influence the detection result in the operation step, the uncertainty of the detection result is increased, the detection result is further influenced, the judgment on the tensile strength and the tensile deformation capacity of the test piece is caused to have errors, the judgment on the safety of concrete is influenced, and the potential safety hazard is generated, in order to solve the problems, there is a need for improved clamps for axial tensile testing of concrete.
Disclosure of Invention
The invention provides a clamp for a concrete axial tension test, aiming at solving a series of problems that the sample preparation is complicated, the sample needs to be specially manufactured according to a detection method, the preparation link is easy to generate errors, the existing clamp is complex in structure, large in mass and volume, and easy to cause the end part of the test piece to slip, the preparation of the sample for the concrete axial tension test is simplified, the detection precision is increased, and the clamp for the concrete axial tension test is provided.
The invention is realized by adopting the following technical scheme:
a clamp for a concrete axial tensile test comprises a clamp steel frame I and a clamp steel frame II; the clamp steel frame I and the clamp steel frame II are arranged in a front-back opposite direction, an upper top plate is arranged between the upper ends of the clamp steel frame I and the clamp steel frame II, and a connecting rod is fixedly installed in the center of the upper top plate; the left lower ends of the clamp steel frame I and the clamp steel frame II are fixedly connected through a left lower screw and a fastening nut, and the right lower ends of the clamp steel frame I and the clamp steel frame II are fixedly connected through a right lower screw and a fastening nut; the left lower screw rod is sleeved with a left hollow round roller, and the right lower screw rod is sleeved with a right hollow round roller; install left side wedge anchor clamps between the left side of anchor clamps steelframe I and anchor clamps steelframe II, promptly: the left side lower part of the clamp steel frame I is provided with a left side fixing cylinder I, the left side lower part of the clamp steel frame II is provided with a left side fixing cylinder II, the front end face and the rear end face of the left side wedge-shaped clamp are symmetrically provided with slideways I, the left side wedge-shaped clamp is supported on the left side fixing cylinder I and the left side fixing cylinder II through the slideways I arranged on the front end face and the rear end face, and the inclined side face of the left side wedge-shaped clamp abuts against the left side hollow round roller; in a similar way, install right side wedge anchor clamps between the right side of anchor clamps steelframe I and anchor clamps steelframe II, promptly: the right side fixing cylinder I is arranged at the lower part of the right side of the clamp steel frame I, the right side fixing cylinder II is arranged at the lower part of the right side of the clamp steel frame II, the front end face and the rear end face of the right side wedge-shaped clamp are symmetrically provided with slide ways II, the right side wedge-shaped clamp is supported on the right side fixing cylinder I and the right side fixing cylinder II through the slide ways II arranged on the front end face and the rear end face, and the inclined side face of the right side wedge-shaped clamp abuts against the right side hollow round roller; the arrangement mode of the slide I and the slide II enables the left wedge-shaped clamp and the right wedge-shaped clamp to gradually approach in the downward movement process.
When the clamp for the concrete axial tensile test is implemented, the clamp steel frame I and the clamp steel frame II are two trapezoidal components which are identical in structure and are arranged in a front-back opposite mode, the upper top plate is arranged between the upper ends of the clamp steel frame I and the clamp steel frame II, the upper ends of the clamp steel frame I and the clamp steel frame II are fixedly connected through the two upper screw rods and the fastening nuts, the two upper screw rods penetrate through the two sides of the upper top plate, bolts are adopted for fixing, the installation is convenient, and the tightness between the clamp steel frame I and the clamp steel frame II can be adjusted conveniently. Go up roof central authorities fixed mounting and have the connecting rod, it is fixed with the connecting rod through the connecting rod mounting, the centre gripping of the connecting rod other end is on universal material testing machine, the connecting rod links to each other whole anchor clamps and universal material testing machine, anchor clamps can insert current universal material testing machine, application scope is wide. The left lower ends of the clamp steel frame I and the clamp steel frame II are fixedly connected through a left lower screw and a fastening nut, the fixing mode is the same as that of the upper screw, and the two ends of the clamp steel frame I and the clamp steel frame II are fixed through the fastening nut; the left hollow round roller is sleeved outside the left lower screw rod, the lower ends of the right sides of the clamp steel frame I and the clamp steel frame II are fixedly connected through the right lower screw rod and the fastening nut, the right hollow round roller is sleeved outside the right lower screw rod, and the left hollow round roller and the right hollow round roller are high-strength hollow steel rollers and are correspondingly sleeved outside the left lower screw rod and the right lower screw rod and can freely rotate; install left side wedge anchor clamps between the left side of anchor clamps steelframe I and anchor clamps steelframe II, promptly: the left side lower part of the clamp steel frame I is provided with a left side fixing cylinder I, the left side lower part of the clamp steel frame II is provided with a left side fixing cylinder II, the left side fixing cylinder I and the left side fixing cylinder II extend inwards and vertically, the front end face and the rear end face of the left side wedge-shaped clamp are symmetrically provided with a slideway I, the slideway I is parallel to the inclined side face of the left side wedge-shaped clamp, the left side wedge-shaped clamp is supported on the left side fixing cylinder I and the left side fixing cylinder II through the slideway I arranged on the front end face and the rear end face, and the inclined side face of the left side wedge-shaped clamp abuts against the left side hollow round roller; similarly, the lower ends of the right sides of the clamp steel frame I and the clamp steel frame II are fixedly connected through a right lower screw and a fastening nut, the fixing mode is the same as that of the upper screw, and the two ends of the clamp steel frame I and the clamp steel frame II are fixed through the fastening nut; install right side wedge anchor clamps between the right side of anchor clamps steelframe I and anchor clamps steelframe II, promptly: the right side fixing cylinder I is arranged at the lower part of the right side of the clamp steel frame I, the right side fixing cylinder II is arranged at the lower part of the right side of the clamp steel frame II, the right side fixing cylinder I and the right side fixing cylinder II vertically extend inwards, slide ways II are symmetrically arranged on the front end surface and the rear end surface of the right side wedge-shaped clamp, the slide ways II are parallel to the inclined side surface of the right side wedge-shaped clamp, the right side wedge-shaped clamp is supported on the right side fixing cylinder I and the right side fixing cylinder II through the slide ways II arranged on the front end surface and the rear end surface, and the inclined side surface of the right side wedge-shaped clamp is abutted against the right hollow round roller; after the sample is clamped, the vertical surfaces of the left wedge-shaped clamp and the right wedge-shaped clamp are always perpendicular to the ground, the contact between the clamp and the sample is guaranteed to be surface contact, the contact area is large, the contact area does not change along with up-and-down sliding, the sudden change of friction force caused by the change of the contact area is avoided, the test piece is further caused to slip, the test failure is realized, the distance range between the vertical surfaces of the left wedge-shaped clamp and the right wedge-shaped clamp is 90-160mm, the 90-160mm sample can be clamped, the size range meets most of test pieces, the test pieces can also be used for on-site coring, the clamping range is large, the sample preparation process is simplified, the test pieces do not need to be prepared in any earlier stage, and the preparation work before the test is reduced. Before installation, the distance between the opposite vertical surfaces of the left side wedge-shaped clamp and the right side wedge-shaped clamp is the largest, the left side wedge-shaped clamp and the right side wedge-shaped clamp are at the highest positions, the left side fixing cylinder I and the left side fixing cylinder II are at the bottom of the slide I, the right side fixing cylinder I and the right side fixing cylinder II are at the bottom of the slide II and gradually approach to each other in the downward movement process, the inclined surfaces of the left side wedge-shaped clamp and the right side wedge-shaped clamp are in good contact with the outer sides of the left side hollow round roller and the right side hollow round roller respectively, the left side hollow round roller and the right side hollow round roller can also enable the left side wedge-shaped clamp and the right side wedge-shaped clamp to slide up and down, the left side wedge-shaped clamp and the right side wedge-shaped clamp are arranged in a triangular prism shape with the same structure, the vertical surfaces are vertical to the ground, the left side wedge-shaped clamp and the test piece are directly contacted with the test piece, the cross section is in a right triangle shape, the vertical surfaces are opposite, and the opposite vertical surfaces are directly contacted with the test piece, be equipped with anti-skidding insection on the vertical face, avoid the test piece at axial tension's in-process slippage, be equipped with the scale along vertical limit on one of them terminal surface, be convenient for observe the position that left side wedge anchor clamps and right side wedge anchor clamps pressed from both sides were got, realize the test piece centering. When the universal material testing machine is used, the connecting rod is connected to the universal material testing machine and lifted, a test piece is placed below a lifted clamp and aligned, the universal material testing machine is lowered to a position that the clamp can be sleeved on the test piece, the left wedge-shaped clamp and the right wedge-shaped clamp are pushed to the highest position, the fixed cylinder slides to the lowest end along the slide way, the top of the wedge-shaped clamp is knocked by a small hammer, and two sides of the test piece are located on the same scale of the vertical surfaces of the left wedge-shaped clamp and the right wedge-shaped clamp, so that the test piece is centered; and then controlling a press machine to lift the test piece, installing a clamp at the lower side of the test piece (namely, the lower part of the test piece is fixed) in the same step, and driving a hollow round roller to move upwards by a clamp steel frame along with the larger upward applied pulling force of the universal material testing machine to further assist the clamp to clamp the test piece by generating continuous inward pressure for the left and right side wedge clamps until the test piece is broken, thereby completing the test.
Compared with the prior art, the invention has the following beneficial effects: the clamp for the concrete axial tension test simplifies the original complex test process by improving the clamp for the concrete axial tension test, has large clamping range, is suitable for most test pieces through the test, can be suitable for common test pieces of 150 × 450mm and 150 × 550mm, and can also be used for coring test pieces on site, realizes the simplified sample preparation process, simplifies the test process, does not need to prepare the test pieces at any earlier stage, reduces the preparation work before the test, simplifies the test steps, avoids the precision reduction caused by errors generated in the earlier stage treatment process of various tests, improves the precision of the detection result, has wide applicability, is simple in part assembly, is not easy to slip, is small in size, is easy to operate, can quickly generate the test result, is suitable for wide popularization and application, and is suitable for batch production and assembly, has great market competitiveness and great significance.
Drawings
Figure 1 shows a front view of the clamp according to the invention.
Fig. 2 shows a view along a direction of fig. 1.
Fig. 3 shows a top view of fig. 1.
In the figure: 1-connecting rod, 2-connecting rod fixing piece, 3-clamp steel frame I, 3 a-clamp steel frame II, 4-left side wedge clamp, 4 a-right side wedge clamp, 5-left side fixed cylinder I, 5 a-left side fixed cylinder II, 501-right side fixed cylinder I, 501 a-right side fixed cylinder II, 6-slideway I, 6 a-slideway II, 7-left side lower screw rod, 7 a-right side lower screw rod, 8-left side hollow round roller, 8 a-right side hollow round roller, 9-fastening nut, 10-upper screw rod and 11-upper top plate.
Detailed Description
The following describes an embodiment of the present invention with reference to the drawings.
According to the direction of a figure 1, the clamp for the concrete axial tensile test comprises a clamp steel frame I3 and a clamp steel frame II 3 a; the clamp steel frame I3 and the clamp steel frame II 3a are arranged in a front-back opposite mode, an upper top plate 11 is arranged between the upper ends of the clamp steel frame I3 and the clamp steel frame II 3a, and a connecting rod 1 is fixedly installed in the center of the upper top plate 11; the left lower ends of the clamp steel frame I3 and the clamp steel frame II 3a are fixedly connected through a left lower screw 7 and a fastening nut 9, and the right lower ends of the clamp steel frame I3 and the clamp steel frame II 3a are fixedly connected through a right lower screw 7a and a fastening nut 9; a left hollow round roller 8 is sleeved outside the left lower screw 7, and a right hollow round roller 8a is sleeved outside the right lower screw 7 a; install left side wedge anchor clamps 4 between the left side of anchor clamps steelframe I3 and anchor clamps steelframe II 3a, promptly: the left side lower part of the clamp steel frame I3 is provided with a left side fixing cylinder I5, the left side lower part of the clamp steel frame II 3a is provided with a left side fixing cylinder II 5a, the front end face and the rear end face of the left side wedge-shaped clamp 4 are symmetrically provided with slideways I6, the left side wedge-shaped clamp 4 is supported on the left side fixing cylinder I5 and the left side fixing cylinder II 5a through the slideways I6 arranged on the front end face and the rear end face, and the inclined side face of the left side wedge-shaped clamp is abutted against the left side hollow round roller 8; in a similar way, install right side wedge anchor clamps 4a between the right side of anchor clamps steelframe I3 and anchor clamps steelframe II 3a, promptly: the lower part of the right side of the clamp steel frame I3 is provided with a right side fixing cylinder I501, the lower part of the right side of the clamp steel frame II 3a is provided with a right side fixing cylinder II 501a, the front end face and the rear end face of the right side wedge-shaped clamp 4a are symmetrically provided with slideways II 6a, the right side wedge-shaped clamp 4a is supported on the right side fixing cylinder I501 and the right side fixing cylinder II 501a through the slideways II 6a arranged on the front end face and the rear end face, and the inclined side face of the right side wedge-shaped clamp is abutted against a right side hollow round roller 8 a; the slide i 6 and the slide ii 6a are arranged in such a manner that the left wedge clamp 4 and the right wedge clamp 4a are gradually brought closer during the downward movement.
The following examples are given.
A clamp for concrete axial tension test is shown in figures 1 and 3: the clamp comprises a clamp steel frame I3 and a clamp steel frame II 3 a; anchor clamps steelframe I3 and anchor clamps steelframe II 3a are two structures the same, be trapezoidal steel structural component, just to arranging and all vertical setting around, be provided with roof 11 between the upper end of anchor clamps steelframe I3 and anchor clamps steelframe II 3a, both sides pass last screw rod 10 and the 9 fixed connection of fastening nut of roof 11 between the upper end of anchor clamps steelframe I3 and anchor clamps steelframe II 3a, two last screw rods 10 pass anchor clamps steelframe 3 in proper order, go up roof 11, anchor clamps steelframe II 3a, both ends use fastening nut 9 to be fixed, as shown in FIG. 2: the upper top plate 11, the fixture steel frame i 3 and the fixture steel frame ii 3a form a main frame structure with a downward opening, and as a supplement, the main frame structure may also be integrally cast, as shown in fig. 1: the center of an upper top plate 11 is fixedly provided with a connecting rod 1, the connecting rod 1 is fixed on the upper top plate 11 through a connecting rod fixing piece 2, the lower surface of the connecting rod 1 is provided with threads, a connecting rod fixing piece 2 is pre-installed on the connecting rod 1 and penetrates through a through hole in the center of the upper top plate 11, then a connecting rod fixing piece 2 is installed on the connecting rod 1, then the two connecting rod fixing pieces are fastened and clamped on the upper top plate 11, the other end of the connecting rod 1 is clamped on a universal material testing machine, the whole clamp is connected with the universal material testing machine, in the embodiment, the upper top plate 11 is clamped through the two connecting rod fixing pieces 2, and other detachable connecting modes can be adopted to fix the connecting rod 1 on the upper top plate 11; the left lower ends of the clamp steel frame I3 and the clamp steel frame II 3a are fixedly connected through a left lower screw 7 and a fastening nut 9, and the right lower ends of the clamp steel frame I3 and the clamp steel frame II 3a are fixedly connected through a right lower screw 7a and a fastening nut 9; the left hollow round roller 8 is sleeved outside the left lower screw 7, the right hollow round roller 8a is sleeved outside the right lower screw 7a, the left hollow round roller 8 and the right hollow round roller 8a are high-strength hollow steel rollers and can freely rotate around the left lower screw 7 and the right lower screw 7a, the left lower screw 7 sequentially penetrates through the fixture steel frame I3, the left hollow round roller 8 and the fixture steel frame II 3a, the right lower screw 7a sequentially penetrates through the fixture steel frame I3, the right hollow round roller 8 and the fixture steel frame II 3a, two ends of the two screws are fixed by fastening nuts 9, and the fixing mode is the same as that of the upper screw 10; install left side wedge anchor clamps 4 between the left side of anchor clamps steelframe I3 and anchor clamps steelframe II 3a, promptly: the left side lower part of a clamp steel frame I3 is provided with a left side fixing cylinder I5, the left side lower part of a clamp steel frame II 3a is provided with a left side fixing cylinder II 5a, the left side fixing cylinder I5 and the left side fixing cylinder II 5a extend inwards and vertically, the front end face and the rear end face of a left side wedge-shaped clamp 4 are symmetrically provided with a slide way I6, the slide way I6 is parallel to the inclined side face of the left side wedge-shaped clamp 4 so as to ensure that the vertical face of the left side wedge-shaped clamp 4 is always vertical to the ground, the clamp is in surface contact with a sample, the contact area is ensured not to change along with up-and-down sliding, the left side wedge-shaped clamp 4 is supported on the left side fixing cylinder I5 and the left side fixing cylinder II 5a through the slide way I6 arranged on the front end face and the rear end face, and the inclined side face of the left side fixing cylinder I5 a abuts against a left side hollow round roller 8; in a similar way, install right side wedge anchor clamps 4a between the right side of anchor clamps steelframe I3 and anchor clamps steelframe II 3a, promptly: the lower part of the right side of the clamp steel frame I3 is provided with a right side fixing cylinder I501, the lower part of the right side of the clamp steel frame II 3a is provided with a right side fixing cylinder II 501a, the right side fixing cylinder I501, the right side fixing cylinder II 501a extends inwards and vertically, the front end face and the rear end face of the right side wedge-shaped clamp 4a are symmetrically provided with a slide way II 6a, the slide way II 6a is parallel to the inclined side face of the right side wedge-shaped clamp 4a, so that the vertical face of the right side wedge-shaped clamp 4a is guaranteed to be perpendicular to the ground all the time, the contact between the clamp and a sample is guaranteed to be surface contact, the contact area is guaranteed not to change along with up-down sliding, the right side wedge-shaped clamp 4a is supported on the right side fixing cylinder I501 and the right side fixing cylinder II 501a through the slide ways II 6a arranged on the front end face and the rear end face, and the inclined side face of the right side fixing cylinder II 501a is abutted to the right side hollow round roller 8 a; the arrangement mode of the slide I6 and the slide II 6a enables the left wedge-shaped clamp 4 and the right wedge-shaped clamp 4a to slide freely in the clamp steel frame I3 and the clamp steel frame II 3a and not fall down, and can slide up and down along the direction of the inclined plane, namely the distance between two opposite vertical surfaces of the left wedge-shaped clamp 4 and the right wedge-shaped clamp 4a changes along with the up-and-down sliding, the distance range between the vertical surfaces is 90-160mm, before installation, the clamp opening is largest, the distance between the opposite vertical surfaces of the left wedge-shaped clamp 4 and the right wedge-shaped clamp 4a is largest, the left wedge-shaped clamp 4 and the right wedge-shaped clamp 4a are at the highest positions, the left fixing cylinder I5 and the left fixing cylinder II 5a are at the bottom of the slide I6, the right fixing cylinder I501 and the right fixing cylinder II a are at the bottom of the slide II 6a, and gradually approach to each other in the downward movement process, and the inclined planes of the left wedge-shaped clamp 4 and the right wedge-shaped clamp 4a respectively and the left hollow round roller 8 and the right hollow round roller The good contact in the heart circle roller 8a outside, left side wedge anchor clamps 4 and right side wedge anchor clamps 4a are two triangular prism forms that the structure is the same and openly arrange, directly are used for pressing from both sides to get the test piece, cross sectional shape is right angled triangle, vertical face is relative, relative vertical face is direct to contact with the test piece, be equipped with anti-skidding insection on the vertical face respectively, avoid the test piece slippage, be equipped with the scale along vertical limit on one of them terminal surface, be convenient for observe left side wedge anchor clamps 4 and the position that right side wedge anchor clamps 4a were got, realize the test piece centering.
When the clamp is used, the upper top plate 11 is clamped between the clamp steel frame I3 and the clamp steel frame II 3a, through holes formed in two corners of the upper ends of the clamp steel frame I3 and the clamp steel frame II 3a are coaxial with through holes in two sides of the upper top plate 11, two upper screw rods 10 penetrate through the clamp steel frame I3, the upper top plate and the clamp steel frame II 3a and are fixed by fastening bolts 9, and a concave main body frame structure is completed; clamping a left fixing cylinder I5 on a clamp steel frame I3 and a left fixing cylinder II 5a on a clamp steel frame II 3a in a slideway I6 arranged on the front and rear end surfaces of a left wedge-shaped clamp 4, similarly, clamping a right fixing cylinder I501 on the clamp steel frame I3 and a right fixing cylinder II 501a on a clamp steel frame II 3a in a slideway I6 a arranged on the front and rear end surfaces of a right wedge-shaped clamp 4a, wherein the vertical surfaces of the left wedge-shaped clamp 4 and the right wedge-shaped clamp 4a are opposite; the left hollow round roller 8 and the right hollow round roller 8a are respectively clamped between a clamp steel frame I3 and a clamp steel frame II 3a, through holes formed at the lower ends of the clamp steel frame I3 and the clamp steel frame II 3a are coaxial with the left hollow round roller 8 and the right hollow round roller 8a, a left lower screw 7 penetrates through the clamp steel frame I3, the clamped left hollow round roller 8 and the clamp steel frame II 3a and is roughly fixed by a fastening nut 9, a right lower screw 7a penetrates through the clamp steel frame I3, the clamped right hollow round roller 8a and the clamp steel frame II 3a and is pre-fixed by the fastening nut 9, the inclined side surface of a left wedge-shaped clamp 4 abuts against the left hollow round roller 8, the inclined side surface of a right wedge-shaped clamp 4a abuts against the right hollow round roller 8a, the fastening bolts 9 at the four corners of the clamp steel frame I3 and the clamp steel frame II 3a are fastened, the upper screw and the lower screw are fixed, the fastening device 9 is adjusted, the left wedge-shaped clamp 4 and the right wedge-shaped clamp 4a can slide up and down along the slide I6 and the slide II 6a, the left hollow round roller 8 and the right hollow round roller 8a can rotate freely, meanwhile, the left wedge-shaped clamp 4 and the right wedge-shaped clamp 4a move up and down along with the rotation of the left hollow round roller 8 and the right hollow round roller 8a, and at the moment, the tightness of the fastening bolt 9 is adjusted reasonably; connecting rod fixing parts 2 are installed on a connecting rod 1 in advance, the connecting rod 1 penetrates through a through hole in the center of an upper top plate 11, the connecting rod fixing parts 2 are installed on the connecting rod 1, two connecting rod fixing parts 2 above and below the upper top plate 11 are fastened to be clamped on the upper top plate 11, the other end of the connecting rod 1 is clamped on a universal material testing machine, the whole clamp is connected with the universal material testing machine, the clamp is lifted on the universal material testing machine, a prepared test piece is placed below the lifted clamp and aligned to be in a position, the universal material testing machine is controlled to slowly descend to a position where the clamp can be sleeved on the test piece, a left wedge-shaped clamp 4 is pushed to the highest position at the moment, a left fixing cylinder I5 and a left fixing cylinder II 5a are pushed to the lowest end of a slide I6 along the slide I6, and a right wedge-shaped clamp 4a is pushed to the highest position, the right fixing cylinder I501 and the right fixing cylinder II 501a slide to the bottom end of the slide II 6a along the slide II 6a at the initial position; aiming at test pieces with different sizes, the left side wedge-shaped clamp 4 and the right side wedge-shaped clamp 4a are controlled to slide downwards, two opposite vertical surfaces of the left side wedge-shaped clamp 4 and the right side wedge-shaped clamp 4a are just slightly sleeved on the test pieces, the heights of the left side wedge-shaped clamp 4 and the right side wedge-shaped clamp 4a are approximately the same, then a small hammer is used for knocking the top of the left side wedge-shaped clamp 4, a left side fixing cylinder I5 and a left side fixing cylinder II 5a are made to slide upwards along a slide way I6, the left side wedge-shaped clamp 4 moves downwards, and similarly, the small hammer is used for knocking the top of the right side wedge-shaped clamp 4a, so that the right side fixing cylinder I501 and the right side fixing cylinder II a are made to slide upwards along the slide way II 6a, the right side wedge-shaped clamp 4a moves downwards, the left side wedge-shaped clamp 4 and the right side wedge-shaped clamp 4a generate inward pressure on the test pieces, and then the higher side of the left side wedge-shaped clamp 4a is knocked, the left wedge-shaped clamp 4 and the right wedge-shaped clamp 4a are exposed to the same scale display, the centering of the test piece is completed at the moment, the friction force between the clamp and the test piece after the clamping is knocked is larger than the gravity of the test piece, the test piece can be hoisted, then the press machine is controlled to hoist the test piece, and the clamp at the lower side of the test piece is installed in the same step (namely, the lower part of the test piece is fixed). After the press machine provides upward pulling force, force begins to be applied to two ends of the test piece, anti-skidding insections on opposite vertical surfaces of the left wedge-shaped clamp 4 and the right wedge-shaped clamp 4a can provide larger friction coefficient, so that the test piece is prevented from skidding and unloading force, as the applied force is larger, the left hollow round roller 8 is driven by the clamp steel frame I3 and the clamp steel frame II 3a to move upwards, so that the left hollow round roller 8 rolls upwards along the inclined surface of the left wedge-shaped clamp 4, and meanwhile, the left fixing cylinder I5 and the left fixing cylinder II 5a slide in the slide I6, namely, the left wedge-shaped clamp 4 slides relative to the clamp steel frame I3 and the clamp steel frame II 3a, so that larger inward pressure can be generated for the left wedge-shaped clamp 4, and similarly, the clamp steel frame I3 and the clamp steel frame II 3a drive the right hollow round roller 8a to move upwards, so that the right hollow round roller 8a rolls upwards along the inclined surface of the right wedge-shaped clamp 4a, simultaneously, the fixed cylinder I501 on the right side and the fixed cylinder II 501a on the right side slide in the slide II 6a, namely the wedge-shaped clamp 4 on the right side slides relative to the clamp steel frame I3 and the clamp steel frame II 3a, larger inward pressure can be generated for the wedge-shaped clamp 4a on the right side, at the moment, the wedge-shaped clamp 4 on the left side and the wedge-shaped clamp 4a on the right side are drawn close inwards, a test piece is clamped until the test piece is broken, and the test is finished.
The scope of the invention is not limited to the above embodiments, and various modifications and changes may be made by those skilled in the art, and any modifications, improvements and equivalents within the spirit and scope of the invention should be included.
Claims (10)
1. The utility model provides a concrete is anchor clamps for axial tension test which characterized in that: comprises a clamp steel frame I (3) and a clamp steel frame II (3 a); the clamp steel frame I (3) and the clamp steel frame II (3 a) are arranged in a front-back opposite mode, an upper top plate (11) is arranged between the upper ends of the clamp steel frame I (3) and the clamp steel frame II (3 a), and a connecting rod (1) is fixedly installed in the center of the upper top plate (11); the clamp steel frame I (3) is fixedly connected with the lower end of the left side of the clamp steel frame II (3 a) through a left lower screw rod (7) and a fastening nut (9), and the clamp steel frame I (3) is fixedly connected with the lower end of the right side of the clamp steel frame II (3 a) through a right lower screw rod (7 a) and a fastening nut (9); a left hollow round roller (8) is sleeved outside the left lower screw (7), and a right hollow round roller (8 a) is sleeved outside the right lower screw (7 a); install left side wedge anchor clamps (4) between the left side of anchor clamps steelframe I (3) and anchor clamps steelframe II (3 a), promptly: the left side lower part of the clamp steel frame I (3) is provided with a left side fixing cylinder I (5), the left side lower part of the clamp steel frame II (3 a) is provided with a left side fixing cylinder II (5 a), the front end face and the rear end face of the left side wedge-shaped clamp (4) are symmetrically provided with slideways I (6), the left side wedge-shaped clamp (4) is supported on the left side fixing cylinder I (5) and the left side fixing cylinder II (5 a) through the slideways I (6) arranged on the front end face and the rear end face, and the inclined side face of the left side wedge-shaped clamp is abutted against a left side hollow round roller (8); in a similar way, install right side wedge anchor clamps (4 a) between the right side of anchor clamps steelframe I (3) and anchor clamps steelframe II (3 a), promptly: the lower part of the right side of the clamp steel frame I (3) is provided with a right side fixing cylinder I (501), the lower part of the right side of the clamp steel frame II (3 a) is provided with a right side fixing cylinder II (501 a), the front end face and the rear end face of the right side wedge-shaped clamp (4 a) are symmetrically provided with slide ways II (6 a), the right side wedge-shaped clamp (4 a) is supported on the right side fixing cylinder I (501) and the right side fixing cylinder II (501 a) through the slide ways II (6 a) arranged on the front end face and the rear end face, and the inclined side face of the right side wedge-shaped clamp is abutted against the right side hollow round roller (8 a); the slide I (6) and the slide II (6 a) are arranged in a mode that the left wedge-shaped clamp (4) and the right wedge-shaped clamp (4 a) are gradually close to each other in the downward movement process.
2. The clamp for the concrete axial tension test according to claim 1, wherein: the left wedge-shaped clamp (4) and the right wedge-shaped clamp (4 a) are identical in structure, and the cross section of each clamp is in a right-angled triangle shape.
3. The clamp for the concrete axial tension test according to claim 1 or 2, wherein: the slide I (6) is parallel to the inclined side face of the left wedge-shaped clamp (4), and the slide II (6 a) is parallel to the inclined side face of the right wedge-shaped clamp (4 a); the vertical surfaces of the left wedge-shaped clamp (4) and the right wedge-shaped clamp (4 a) are opposite.
4. The clamp for the concrete axial tension test according to claim 3, wherein: the distance between the vertical surfaces of the left wedge-shaped clamp (4) and the right wedge-shaped clamp (4 a) ranges from 90 mm to 160 mm.
5. The clamp for the concrete axial tension test according to claim 4, wherein: and anti-skid insections are respectively arranged on the vertical surfaces of the left wedge-shaped clamp (4) and the right wedge-shaped clamp (4 a).
6. The clamp for the concrete axial tension test according to claim 5, wherein: and a graduated scale is arranged on one end face of the left wedge-shaped clamp (4) or the right wedge-shaped clamp (4 a) along the vertical edge.
7. The clamp for the concrete axial tension test according to claim 6, wherein: the structure of the fixture steel frame I (3) is the same as that of the fixture steel frame II (3 a), and the fixture steel frame I and the fixture steel frame II are trapezoidal.
8. The clamp for the concrete axial tension test according to claim 7, wherein: the upper ends of the fixture steel frame I (3) and the fixture steel frame II (3 a) are fixedly connected through two upper screw rods (10) and fastening nuts (9).
9. The clamp for the concrete axial tension test according to claim 8, wherein: two upper screw rods (10) penetrate through two sides of the upper top plate (11).
10. The clamp for the concrete axial tension test according to claim 8, wherein: the connecting rod (1) is fixed on the upper top plate (11) through a connecting rod fixing piece (2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111384683.1A CN114088514B (en) | 2021-11-22 | 2021-11-22 | Clamp for concrete axial tensile test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111384683.1A CN114088514B (en) | 2021-11-22 | 2021-11-22 | Clamp for concrete axial tensile test |
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| CN114088514B CN114088514B (en) | 2023-12-29 |
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| CN111289356A (en) * | 2020-03-06 | 2020-06-16 | 同济大学 | Test fixture for concrete axial tension force and use method thereof |
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| GB769725A (en) * | 1954-12-17 | 1957-03-13 | Avery Ltd W & T | Improved wedge grips for use in testing machines |
| JPH11248611A (en) * | 1998-03-02 | 1999-09-17 | Sanko Techno Co Ltd | Fixing tool for irregular shaped reinforcing steel tensile test machine |
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|---|---|
| CN114088514B (en) | 2023-12-29 |
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