CN111707541A - Concrete uniaxial tension holding load and testing device and using method thereof - Google Patents
Concrete uniaxial tension holding load and testing device and using method thereof Download PDFInfo
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- CN111707541A CN111707541A CN202010586686.2A CN202010586686A CN111707541A CN 111707541 A CN111707541 A CN 111707541A CN 202010586686 A CN202010586686 A CN 202010586686A CN 111707541 A CN111707541 A CN 111707541A
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The concrete uniaxial tension load holding and testing device and the using method thereof do not need to adopt a separate load sensor, and adopt a method of sticking a resistance strain gauge on a connecting sleeve with an internal thread and an external light circle so that the device can be used as the load sensor, thereby simplifying the testing device and reducing the cost problem that a large number of load sensors are occupied by holding the load for a long time. According to the invention, the axial tension is applied to the concrete test block by simultaneously rotating the second four finishing nuts close to one side of the upper spherical hinge. And the connecting sleeve adhered with the strain gauge is also used as a load sensor to obtain a load, and the fine adjustment of the load is realized by slightly rotating the second specification of the finish rolling nut. For the concrete uniaxial tension testing device, a square steel plate and a straight-through drawing instrument are added on the basis of a load holding device. The invention combines the concrete single-shaft tension load-holding and testing device into a whole, has simple operation and can provide stable and effective continuous load.
Description
Technical Field
The invention belongs to the field of civil engineering, and particularly relates to a concrete uniaxial tension load-holding and testing device and a using method thereof, which are particularly suitable for a durability test for researching a concrete uniaxial tension test piece under the coupling action of load and an erosion environment.
Background
It is well known that concrete is one of the most widely used building materials in current engineering construction, compressive strength being its most significant feature, and tensile strength being of less concern. Therefore, in modern structures, concrete is mainly used for bearing the compressive strength, the tensile strength of the concrete is generally only 1/17-1/8 of the compressive strength, and the tensile strength of the concrete can be achieved with a small load, so the tensile strength of the concrete is usually ignored in the structure design and the tensile strength of the structure is borne by steel bars. In some structures, such as fully prestressed concrete structures, tensile stresses are not allowed, while in partially prestressed structures tensile stresses are allowed.
The tensile strength and deformation of concrete are among the most important basic properties of concrete. It is an important component for researching concrete strength theory and failure mechanism, and also an important factor for influencing the cracking, deformation and durability of concrete structure. In addition, the tensile strength is also a main factor influencing the shear resistance of the concrete and is an important parameter for establishing a multiaxial failure criterion of the concrete. In recent years, along with the construction of a large number of high-rise buildings and large-span bridge projects, the proportion of high-performance concrete used in modern structures is higher and higher, and the high-performance concrete has the main characteristic of high durability, and a plurality of macroscopic cracks appear on the surfaces of actual structures such as bridges, crane beams, pavements, ocean platforms and the like, so that the durability, the safety and the reliability of the structures and the service life of the structures are seriously influenced. The development of concrete cracks is mainly related to tensile strength, so that the research on the tensile property of concrete is of great significance.
The test research on the concrete tensile strength of the concrete is only in the initial stage for a long time, and in addition, the great discreteness of the concrete is realized, and the backward of the concrete tensile test equipment, the understanding of the tensile strength of people is lack of integrity. After the 60 s of the 20 th century, researchers developed a series of concrete tensile test devices, which can measure the whole curve of the tensile stress and strain of concrete, but the test devices adopted by the researchers are different. In the previous research, the research on the long-term performance of a concrete uniaxial tension test piece under continuous load, particularly the durability under an erosion service environment (coupling action of load and erosion environment) is less, and in the test process, the concrete axial tension is realized by a physical centering method, so that the operation is complex, and the centering condition is difficult to control. Therefore, no known effective method exists at present, if the test piece cannot be centered, the test piece will be broken quickly once loaded, the test will fail, and the requirement of the durability test on the environmental conditions such as test temperature, humidity and the like is very strict; in addition, the operation process of the test is very complex, and the requirements on test equipment, a data acquisition system, the performance of a test piece and test conditions are very high. In the past research, two sets of test devices are often needed for a load holding device and a test device for a concrete uniaxial tension test under the long-term action of load, and the test device is not convenient enough. Therefore, a set of concrete uniaxial tension holding load and testing device needs to be established as early as possible.
Disclosure of Invention
The invention provides a concrete uniaxial tension holding load and testing device and a using method thereof, aiming at the problems that a traditional concrete tension testing device is used, a concrete test piece is difficult to center and the testing operation process is complex.
The technical scheme of the invention is as follows:
the concrete uniaxial tension load and test device is characterized by comprising a concrete test block, a top steel plate, a bottom steel plate, four second pre-stressed finish-rolled twisted steel bars, two spherical hinges, a common connecting rod, a lengthened connecting rod and two square anchor plates; the top steel plate and the bottom steel plate respectively penetrate through the four second pre-stress finish rolling threaded steel bars and are respectively arranged on the upper part and the lower part of the second pre-stress finish rolling threaded steel bars in parallel; the top steel plate and the bottom steel plate are respectively in rotating contact with the spherical hinge, the lengthened connecting rod is fixedly connected with the spherical hinge positioned at the top into a whole, and the common connecting rod is fixedly connected with the spherical hinge positioned at the bottom into a whole;
the two square anchor plates are fixedly connected with the top end and the bottom end of the concrete test block through four corners of the two square anchor plates respectively, and first pre-stressed finish-rolled twisted steel bars are fixed in the middle of the two square anchor plates respectively; the end parts of the two first pre-stress finish rolling twisted steel bars are respectively in threaded screwed connection with connecting sleeves, and the two connecting sleeves are respectively in threaded screwed connection with the common connecting rod and the lengthened connecting rod; and (3) the first prestress finish rolling twisted steel on the upper part is driven upwards to bear force, so that the concrete uniaxial tension holding load and the test are completed.
Furthermore, four finish rolling threaded steel bars are respectively prefabricated at the top end and the bottom end of the concrete test block and are exposed for a certain length; and the four corners of the square anchor plate are respectively provided with a preformed hole, four finish-rolled twisted steel bars pass through the four preformed holes of the corresponding square anchor plate, the finish-rolled twisted steel bars are screwed into the finish-rolled nuts, and the two square anchor plates and the concrete test block are connected into a whole.
Furthermore, the bottom steel plate and the top steel plate are variable cross-section steel plates.
Furthermore, four finish rolling nuts are arranged on the bottom steel plate and are in screwed connection with corresponding second pre-stressed finish rolling threaded steel bars, and steel washers are arranged between the finish rolling nuts and the bottom steel plate.
Furthermore, the top steel plate and the bottom steel plate are respectively fixed with a round reinforcing steel pipe, and the two round reinforcing steel pipes are respectively sleeved on the lengthened connecting rod and the common connecting rod;
four rectangular stiffening rib steel plates are uniformly arranged in the circumferential direction of the two reinforced circular steel tubes and fixedly connected with the corresponding steel plates, and the four rectangular stiffening rib steel plates are used for connecting the reinforced circular steel tubes and the corresponding steel plates in four directions so as to ensure that the spherical hinges are not locally damaged.
Furthermore, the outer surface of the upper connecting sleeve is pasted with a strain gauge which is also used as a load sensor, and the strain gauge is connected with a resistance strain gauge through a connecting lead.
Furthermore, four finish rolling nuts are arranged at the bottom of the top steel plate and are in screwed connection with corresponding second pre-stressed finish rolling threaded steel bars, and a steel washer is arranged between each finish rolling nut and the top steel plate. Specifically, concrete uniaxial tension holding load test:
the four finish rolling nuts at the bottom of the top steel plate are simultaneously rotated to apply an outward force to the top steel plate, so that the lengthened connecting rod, the connecting sleeve and the first pre-stressed finish rolling threaded steel bar are sequentially driven to be stressed, and the concrete test block is pulled; meanwhile, the bottom steel plate limits the movement of the first pre-stressed finish-rolled twisted steel bar and the square anchor plate, so that the load holding of the concrete test block is realized; the magnitude of the continuous load is obtained by using a connecting sleeve pasted with a strain gauge as a load sensor, and fine adjustment of the load is realized by slightly rotating a finish rolling nut at the bottom of a top steel plate; in the load holding process, the upper variable cross-section steel plate surface and the lower variable cross-section steel plate surface are ensured to be parallel.
Furthermore, two middle steel plates are arranged between the upper connecting sleeve and the upper rectangular stiffening rib steel plate, and the two middle steel plates respectively penetrate through the four second pre-stress finish rolling twisted steel bars; one of the middle steel plates is positioned above the upper connecting sleeve, the top of the middle steel plate is used for supporting a straight-through drawing instrument, the straight-through drawing instrument is sleeved on the lengthened connecting rod, four finish rolling nuts are arranged at the bottom of the middle steel plate and are screwed with corresponding second pre-stress finish rolling threaded steel bars, and steel gaskets are arranged between the finish rolling nuts and the middle steel plate; the other intermediate steel plate is positioned at the top of the punching and drawing instrument. Specifically, concrete uniaxial tension test:
during testing, the straight-through drawing instrument pushes against the middle steel plate above the straight-through drawing instrument to apply upward force, and the pulling force is transmitted to the concrete test block through the spherical hinge at the upper end, the lengthened connecting rod, the connecting sleeve and the first pre-stressed finish-rolled twisted steel bar respectively; meanwhile, the ball hinge at the bottom limits the movement of the first pre-stressed finish rolling twisted steel and the square anchor plate, so that the tensile force is applied to the concrete test block until the test block is damaged; the tensile force is measured by the connecting sleeve which is also used as a load sensor, and then the tensile strength of the concrete can be calculated by applying a formula.
The invention does not need to adopt a separate load sensor, and adopts the method that the connecting sleeve with the internal thread and the external smooth circle is pasted with the resistance strain gauge, so that the invention can be used as the load sensor, thereby simplifying the test device and reducing the cost problem that a large amount of load sensors are occupied for long-term load holding. The sleeve load holding device is simple to operate and can provide stable and effective continuous load. The invention combines the concrete uniaxial tension load-holding and testing device into a whole, does not need to use two devices to carry out load-holding test and test on the concrete uniaxial tension performance under the long-term action of load, and forms the testing device on the basis of the load-holding device.
The steel plate is made of stainless steel; according to the invention, the axial tension is applied to the concrete test block by simultaneously rotating the second four finishing nuts close to one side of the upper spherical hinge. And the connecting sleeve adhered with the strain gauge is also used as a load sensor to obtain a load, and the fine adjustment of the load is realized by slightly rotating the second specification of the finish rolling nut. For the concrete uniaxial tension testing device, a square steel plate and a straight-through drawing instrument are added on the basis of a load holding device.
The invention has the beneficial effects that:
1. the invention provides a concrete uniaxial tension load-holding and testing device which is simple in structure and easy to operate;
2. the load holding device can provide reliable and stable load for the concrete test block by screwing the finish rolling nut below the top steel plate, can meet the requirement of long-term loading, can ensure that the spherical hinge at the end part can rotate when meeting eccentric force, can ensure that the steel plate is stably pushed, and applies axial tension to the concrete test block so as to avoid adverse effect on the test caused by eccentric tension;
3. the load holding device can apply continuous load to the test piece without using a reaction frame, and the connecting sleeve adhered with the strain gauge is also used as a load sensor, so that the space occupied by the loading device is greatly reduced;
4. the invention can be used as a concrete uniaxial tension load-holding device, and can form a concrete uniaxial tension testing device through local modification;
5. the load holding and testing device is made of corrosion-resistant stainless steel materials and is not easy to rust. After the test piece is kept loaded, the test piece is placed into an erosion environment simulation device (such as a freeze-thaw test box, a carbonization box, a chloride salt and sulfate erosion solution environment and the like), so that the test piece is in a state of coupling action of load and an erosion environment, the service stress state of the erosion environment is simulated, and the mechanical property and the durability of the test piece are tested.
Drawings
FIG. 1 is a schematic view of the concrete uniaxial tension holding load test device of the present invention;
FIG. 2 is a schematic view of a square anchor plate;
3 FIG. 3 3 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 line 3 A 3- 3 A 3 of 3 FIG. 3 1 3; 3
FIG. 4 is a schematic view of a steel washer;
FIG. 5 is a schematic view of the present invention as a concrete uniaxial tension test apparatus;
FIG. 6 is a cross-sectional view taken along line B-B of FIG. 5;
FIG. 7 is a schematic view of a square steel plate;
in the figure, 1 is the concrete test block, 2 is finish rolling twisted steel, 3 is square anchor slab, 4 is prestressing force finish rolling twisted steel specification one (first prestressing force finish rolling twisted steel), 5 is finish rolling nut specification one, 6 is the connecting sleeve, 7 is ordinary connecting rod, 8 is the extension connecting rod, 9 is the reinforcing circular steel tube, 10 is the rectangle stiffening rib steel sheet, 11 is the ball pivot, 12 is prestressing force finish rolling twisted steel specification two (second prestressing force finish rolling twisted steel), 13 steel packing ring, 14 is finish rolling nut specification two, 15 is the foil gage, 16 is the resistance strain gauge, 17 is connecting wire, 18 is square steel sheet, 19 is the straight-through drawing appearance.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
Example 1
As shown in figure 1, the concrete uniaxial tension holding load test device comprises a concrete test block 1, a finish rolling threaded steel bar 2, a square anchor plate 3, a prestressed finish rolling threaded steel bar specification I4, a finish rolling nut specification I5, a connecting sleeve 6, a common connecting rod 7, an extension connecting rod 8, a reinforced round steel tube 9, a rectangular stiffening rib steel plate 10, a spherical hinge 11, a prestressed finish rolling threaded steel bar specification II 12, a steel gasket 13, a finish rolling nut specification II 14, a strain gauge 15, a resistance strain gauge 16 and a connecting wire 17. The concrete test block 1 (120 mm multiplied by 400 mm) is a non-standard type, the influence of reducing the end stress effect is considered, the tensile damage is ensured to occur in the middle part, the area of the middle part of the test piece is reduced, the test piece is poured and formed by adopting a self-made steel die, the die is removed after 24 hours, and the test piece is placed into a standard curing chamber for curing after the die is removed; eight finish-rolled twisted steel bars 2 (with the length of 150 mm) are respectively embedded at two ends of the concrete test block so as to realize the uniform distribution of axial tensile strength and stress, provide enough anchoring strength and expose the finished twisted steel bars for a certain length, thereby facilitating the test operation; the device is divided into an upper part and a lower part by a concrete test block 1 and finish-rolled twisted steel bars 2 pre-embedded in the concrete test block.
For the upper half part of the device, as shown in fig. 2, the square anchor plate 3 is arranged at the end part of the concrete test block 1, four reserved holes are arranged at four corners, and the center of the square anchor plate is welded with a prestressed finish-rolled twisted steel specification I4 to form a whole; the first 5 specification of the finish rolling nut is provided with four corners of the square anchor plate 3 and is used for connecting the finish rolling threaded steel bar 2 with the square anchor plate 3 and further connecting the concrete test block 1 with the first 4 specification of the prestressed finish rolling threaded steel bar. The connecting sleeve 6 is provided with an internal thread and has a smooth outer surface, and the prestress finish rolling twisted steel specification I4 and the lengthened connecting rod 8 are connected together through the connecting sleeve 6; the reinforced circular steel tube 9 is fixed with the variable cross-section steel plate at the end part of the spherical hinge 11, and is sleeved on the lengthened connecting rod 8, and a certain distance is reserved between the reinforced circular steel tube and the lengthened connecting rod 8.
As shown in fig. 3, the rectangular stiffening rib steel plate 10 is used for connecting the reinforced circular steel tube 9 and the spherical hinge 11 in four directions so as to prevent the spherical hinge from being locally damaged; the spherical hinge 11 can rotate under the action of eccentric force; the variable cross-section steel plate is a part of the spherical hinge, four reserved holes are arranged at four corners, and the variable cross-section steel plate is designed to be heavy due to the fact that the thickness of the steel plate is large.
For the lower half of the device, the elongated connecting rods 8 in the upper half are replaced by ordinary connecting rods 7, and the rest of the device is the same as the upper half of the device.
And the second 12 specification of the prestressed finish-rolled twisted steel is four, and the four specifications respectively penetrate reserved holes at four corners of the upper and lower variable cross-section steel plates.
As shown in fig. 4, the steel washer 13 is circular and is arranged between the variable cross-section steel plate and the second finish rolling nut specification 14, the inner diameter of the steel washer is slightly larger than the diameter of the second prestressed finish rolling twisted steel specification 12, and the outer diameter of the steel washer is larger than the diameter of the circumscribed circle of the second finish rolling nut specification 14; and the second finish rolling nut specification 14 connects the second prestressed finish rolling twisted steel specification 12 with the upper and lower variable cross-section steel plates.
Further, the diameter of the preformed hole on the square anchor plate 3 is larger than that of the finish-rolled twisted steel bar 2.
The diameter of the first prestress finish rolling threaded steel bar specification 4 is larger than the diameter of the second prestress finish rolling threaded steel bar specification 12.
And the first precision rolling nut specification 5 and the second precision rolling nut specification 14 are both hexagon nuts.
The lengthened connecting rod 8 and the common connecting rod 7 are both made of steel and are respectively integrated with the spherical hinges 11 at the upper end and the lower end.
A certain distance is left between the reinforced circular steel tube 9 and the connecting sleeve 6.
The preformed hole on the variable cross-section steel plate at the end part of the spherical hinge 11 is a circular through hole, the diameter of the preformed hole is larger than that of the second prestressed finish-rolled twisted steel specification 12, and the groove is reserved in the middle of the variable cross-section steel plate to be in rotary contact with the spherical hinge.
Still further, the surface of the connecting sleeve 6 of the upper half part of the device is pasted with a strain gauge 15 which is also used as a load sensor. The strain gauge 15 is connected with a resistance strain gauge 16 through a connecting lead 17, the connecting sleeve 6 is pulled when the load is held, the tensile strain can be displayed by the resistance strain gauge 16 and converted into the tensile force applied to the connecting sleeve 6 through calculation, and the tensile force applied to the connecting sleeve 6 is the continuous load applied to the concrete test block 1.
The device is made of corrosion-resistant stainless steel materials, and the durability of the device is not reduced under the action of an erosion environment.
The utility model provides a concrete unipolar is drawn and is held lotus test device, last load in normal use state is realized through rotating two 14 of four finish rolling nut specifications of upper end variable cross-section steel sheet inboard simultaneously, exert outside power to the variable cross-section steel sheet through rotating two 14 of finish rolling nut specifications, drive extension connecting rod 8 in proper order, connecting sleeve 6, prestressing finish rolling twisted steel specification 4 atress, and then make concrete test block 1 draw, the removal of prestressing finish rolling twisted steel specification 4 and square anchor slab 3 has been restricted to lower extreme variable cross-section steel sheet simultaneously, and then realize holding the lotus of concrete test block 1. The magnitude of the continuous load is obtained by using the connecting sleeve 6 adhered with the strain gauge as a load sensor, and the second specification 14 of the finish rolling nut is slightly rotated to realize fine adjustment of the load. In the load holding process, the upper variable cross-section steel plate surface and the lower variable cross-section steel plate surface are ensured to be parallel. Then, the test piece is placed into an erosion environment simulation device after being loaded, and is placed for a period of time.
Example 2
As shown in FIG. 5, a concrete uniaxial tension testing device takes out a load holding device in an erosion environment simulation device, and adds a square steel plate 18 and a feed-through drawing instrument 19 on the basis of the load holding device. Two square steel plates 18 are added, one square steel plate is placed between the upper half part connecting sleeve 6 and the rectangular stiffening rib steel plate 10 and used for supporting an upper straight-through drawing instrument 19, the lower part of the square steel plate is fixed by a steel washer 13 and a second finish rolling nut specification 14, and the other square steel plate is arranged above the straight-through drawing instrument 19 and used for supporting the rectangular stiffening rib steel plate 10; the rectangular stiffening rib steel plate 10 is arranged to be rectangular and is conveniently propped by a square steel plate 18 below the rectangular stiffening rib steel plate; the straight-through drawing instrument 19 is arranged on the square steel plate 18 and used for applying tension; as shown in FIG. 6, the steel washer 13 and the second finishing nut 14 inside the variable cross-section steel plate were removed.
Further, as shown in fig. 7, five circular prepared holes are respectively provided at four corners and a center of the square steel plate 18, and the diameter of the prepared hole at the four corners is larger than that of the second specification 12 of the finish rolled prestressed twisted steel, and the diameter of the prepared hole at the center is larger than that of the elongated connecting rod 8.
The utility model provides a concrete unipolar is drawn testing arrangement, during the test the appearance 19 is drawn to the straight-through and is pushed up square steel plate 18 above it and exert ascending power, and the pulling force is passed to concrete test block 1 through ball pivot 11, extension connecting rod 8, adapter sleeve 6, prestressing force finish rolling twisted steel specification 4 of device upper end respectively, and ball pivot 11 of lower extreme has simultaneously restricted prestressing force finish rolling twisted steel specification 4 and the removal of square anchor slab 3, and then realizes exerting the pulling force to concrete test block 1, until the test piece destroys. The tensile force is measured by the connecting sleeve 6 which also serves as a load sensor, and then the tensile strength of the concrete can be calculated by applying a formula.
Finally, the present invention is not limited to the above-described embodiments, and many modifications may be made on the basis of the essence of the present invention, and all modifications directly conceivable by those skilled in the art on the basis of the disclosure of the present invention should be considered as the scope of protection of the present invention.
Claims (10)
1. The concrete uniaxial tension load and test device is characterized by comprising a concrete test block, a top steel plate, a bottom steel plate, four second pre-stressed finish-rolled twisted steel bars, two spherical hinges, a common connecting rod, a lengthened connecting rod and two square anchor plates; the top steel plate and the bottom steel plate respectively penetrate through the four second pre-stress finish rolling threaded steel bars and are respectively arranged on the upper part and the lower part of the second pre-stress finish rolling threaded steel bars in parallel; the top steel plate and the bottom steel plate are respectively in rotating contact with the spherical hinge, the lengthened connecting rod is fixedly connected with the spherical hinge positioned at the top into a whole, and the common connecting rod is fixedly connected with the spherical hinge positioned at the bottom into a whole;
the two square anchor plates are fixedly connected with the top end and the bottom end of the concrete test block through four corners of the two square anchor plates respectively, and first pre-stressed finish-rolled twisted steel bars are fixed in the middle of the two square anchor plates respectively; the end parts of the two first pre-stress finish rolling twisted steel bars are respectively in threaded screwed connection with connecting sleeves, and the two connecting sleeves are respectively in threaded screwed connection with the common connecting rod and the lengthened connecting rod; and (3) the first prestress finish rolling twisted steel on the upper part is driven upwards to bear force, so that the concrete uniaxial tension holding load and the test are completed.
2. The concrete uniaxial tension holding load and testing device of claim 1, wherein four finish rolling twisted steel bars are prefabricated at the top end and the bottom end of the concrete test block respectively and are exposed for a certain length; and the four corners of the square anchor plate are respectively provided with a preformed hole, four finish-rolled twisted steel bars pass through the four preformed holes of the corresponding square anchor plate, the finish-rolled twisted steel bars are screwed into the finish-rolled nuts, and the two square anchor plates and the concrete test block are connected into a whole.
3. The concrete uniaxial tension load and test device of claim 1, wherein the bottom steel plate and the top steel plate are variable cross-section steel plates.
4. The concrete uniaxial tension holding load and testing device of claim 2, wherein four finish rolling nuts are provided on the bottom steel plate to be screwed with the corresponding second pre-stressed finish rolling deformed bar, and a steel washer is provided between the finish rolling nuts and the bottom steel plate.
5. The concrete uniaxial tension load and test device as recited in claim 4, wherein the top steel plate and the bottom steel plate are respectively fixed with a reinforced circular steel tube, and the two reinforced circular steel tubes are respectively sleeved on the lengthened connecting rod and the common connecting rod;
four rectangular stiffening rib steel plates are uniformly arranged in the circumferential direction of the two reinforced circular steel tubes and fixedly connected with the corresponding steel plates, and the four rectangular stiffening rib steel plates are used for connecting the reinforced circular steel tubes and the corresponding steel plates in four directions so as to ensure that the spherical hinges are not locally damaged.
6. The concrete uniaxial tension load and test device as claimed in claim 5, wherein the outer surface of the upper connecting sleeve is adhered with a strain gauge which is also used as a load sensor, and the strain gauge is connected with a resistance strain gauge through a connecting lead.
7. The concrete uniaxial tension holding load and testing device of claim 6, wherein four finish nuts are provided on the bottom of the top steel plate to be screwed with the corresponding second pre-stressed finish-rolled threaded steel bars, and a steel washer is provided between the finish nuts and the top steel plate.
8. The concrete uniaxial tension holding load and testing device as recited in claim 6, wherein two intermediate steel plates are arranged between the upper connecting sleeve and the upper rectangular stiffening rib steel plate, and the two intermediate steel plates respectively penetrate through four second pre-stressed finish-rolled twisted steel bars; one of the middle steel plates is positioned above the upper connecting sleeve, the top of the middle steel plate is used for supporting a straight-through drawing instrument, the straight-through drawing instrument is sleeved on the lengthened connecting rod, four finish rolling nuts are arranged at the bottom of the middle steel plate and are screwed with corresponding second pre-stress finish rolling threaded steel bars, and steel gaskets are arranged between the finish rolling nuts and the middle steel plate; the other intermediate steel plate is positioned at the top of the straight-through drawing instrument.
9. The method of using a concrete uniaxial tension holding and testing device of claim 7, wherein the concrete uniaxial tension holding test:
the four finish rolling nuts at the bottom of the top steel plate are simultaneously rotated to apply an outward force to the top steel plate, so that the lengthened connecting rod, the connecting sleeve and the first pre-stressed finish rolling threaded steel bar are sequentially driven to be stressed, and the concrete test block is pulled; meanwhile, the bottom steel plate limits the movement of the first pre-stressed finish-rolled twisted steel bar and the square anchor plate, so that the load holding of the concrete test block is realized; the magnitude of the continuous load is obtained by using a connecting sleeve pasted with a strain gauge as a load sensor, and fine adjustment of the load is realized by slightly rotating a finish rolling nut at the bottom of a top steel plate; in the load holding process, the upper variable cross-section steel plate surface and the lower variable cross-section steel plate surface are ensured to be parallel.
10. The method of using a concrete uniaxial tension holding and testing device according to claim 8, wherein the concrete uniaxial tension test is as follows:
during testing, the straight-through drawing instrument pushes against the middle steel plate above the straight-through drawing instrument to apply upward force, and the pulling force is transmitted to the concrete test block through the spherical hinge at the upper end, the lengthened connecting rod, the connecting sleeve and the first pre-stressed finish-rolled twisted steel bar respectively; meanwhile, the ball hinge at the bottom limits the movement of the first pre-stressed finish rolling twisted steel and the square anchor plate, so that the tensile force is applied to the concrete test block until the test block is damaged; the tensile force is measured by the connecting sleeve which is also used as a load sensor, and then the tensile strength of the concrete can be calculated by applying a formula.
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| CN113865990A (en) * | 2021-09-27 | 2021-12-31 | 吉林大学 | Device for simulating drawing test of concrete pile in frozen soil layer |
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| CN112986004A (en) * | 2021-02-09 | 2021-06-18 | 中国科学院金属研究所 | Tension-compression bidirectional high-temperature creep endurance testing machine |
| CN112986004B (en) * | 2021-02-09 | 2022-09-09 | 中国科学院金属研究所 | Tension-compression bidirectional high-temperature creep endurance testing machine |
| CN113865990A (en) * | 2021-09-27 | 2021-12-31 | 吉林大学 | Device for simulating drawing test of concrete pile in frozen soil layer |
| CN113865990B (en) * | 2021-09-27 | 2024-04-19 | 吉林大学 | Device for simulating drawing test of concrete pile in frozen soil layer |
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