CN211061324U - Cement-based material continuous loading device for durability test - Google Patents
Cement-based material continuous loading device for durability test Download PDFInfo
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- CN211061324U CN211061324U CN201921585127.9U CN201921585127U CN211061324U CN 211061324 U CN211061324 U CN 211061324U CN 201921585127 U CN201921585127 U CN 201921585127U CN 211061324 U CN211061324 U CN 211061324U
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Abstract
The utility model discloses a durability test's cement-based material lasts lotus loading device, including reaction frame, pressure sensor and jack, the inside of reaction frame is provided with the tension and holds lotus device or the compression holds lotus device. Cement-based material test blocks are clamped and fixed in the tension load holding device and the compression load holding device, and the pressure sensor controls the jack to apply pressure to the tension load holding device or the compression load holding device. The tension load holding device converts pressure into constant tension and transmits the constant tension to the cement-based material test block, and the compression load holding device converts the pressure into constant pressure and transmits the constant pressure to the cement-based material test block. The inside reinforcing bar meter that all is provided with of load device is held in the pulling and the pressurized load device, and the reinforcing bar meter regularly detects the atress size of cement-based material test block, detects out that the atress has the loss time, and accessible jack carries out the benefit to cement-based material test block. The utility model discloses can accurately simulate out the atress condition of cement-based material among the actual conditions, improve experimental accuracy.
Description
Technical Field
The utility model relates to a cement-based material holds lotus loading device, concretely relates to cement-based material test block receives one-way loading device for the durability test.
Background
Currently, the durability test for most cement-based material test blocks is carried out under no-load condition and corrosive medium erosion. The actual engineering structure is always under the load, and the continuous load can generate micro-cracks, so that the impermeability of the cement-based material is poor, and the durability of the cement-based material is influenced. The sulfate corrosion of the cement-based material test block in a no-load state cannot truly reflect the corrosion state of the cement-based material by a corrosive medium in the use stage. Therefore, the establishment of a multifactorial cable coupling test method under a stress state of a simulated real environment has great significance for researching the degradation rule damage mechanism and the protective measures of the performance of the cement-based material under the coupling action of the multifactorial system.
At present, similar designs of cement-based material durability test loading devices under the action of compressive stress and multi-factor coupling have been designed at home and abroad, and literature reports on technical research and analysis, such as devices of Chinese Water conservancy scientific research institute, are devices for researching concrete flexural stress, and stress wrench nuts are adopted for loading test pieces. Under the action of continuous unidirectional stress, a continuous load loading device which is simple and easy to operate and can meet certain precision requirements needs to be designed.
Disclosure of Invention
The utility model aims at providing a simple structure, the accurate cement-based material that just is used for cement-based material durability test of load of holding load loading device that receives tension and compression.
The technical scheme adopted for realizing the purpose of the utility model is that the cement-based material continuous loading device for the durability test comprises a reaction frame, a pressure sensor, a jack and a tension loading device.
The reaction frame comprises a top plate, a bottom plate and four screw rods I, wherein the top plate is located right above the bottom plate. The top plate and the bottom plate are rectangular plates which are horizontally arranged, four through holes are formed in the two rectangular plates, and the four through holes are located in four corners of each rectangular plate respectively. Four screw rod I passes four through-holes of roof and four through-holes of bottom plate, fixes the roof in the upper end of every screw rod I through the nut, fixes the bottom plate at the lower extreme of every screw rod I through the nut to form inside hollow frame body.
The lower surface of the top plate is connected with a pressure sensor, and the lower end of the pressure sensor is connected with a jack. The lower end of the jack is connected with an inner support, the upper surface of the bottom plate is connected with another inner support, and a tension load supporting device is connected between the two inner supports.
The tension load holding device comprises an upper load holding steel plate I, a lower load holding steel plate I, four screw rods II and two U-shaped steel plates. The lower end of the upper inner support is connected with an upper load-supporting steel plate I, and the upper end of the lower inner support is connected with a lower load-supporting steel plate I.
The upper load holding steel plate I and the lower load holding steel plate I are both rectangular plates which are horizontally arranged, and the upper load holding steel plate I is located right above the lower load holding steel plate I. The upper load-holding steel plate I and the lower load-holding steel plate I are respectively provided with five through holes, wherein the four through holes are respectively positioned at four corners of the rectangular plate, and one through hole is positioned at the central point of the rectangular plate.
The upper ends of the four screw rods II penetrate through holes in the four corners of the upper load holding steel plate I, and the lower ends of the four screw rods II penetrate through holes in the four corners of the lower load holding steel plate I. And two nuts are screwed into each screw II, one nut is tightly propped against the upper surface of the upper load-holding steel plate I, and the other nut is tightly propped against the upper surface of the lower load-holding steel plate I.
And each screw rod II is provided with a clamping piece, and the clamping piece is positioned between the upper load holding steel plate I and the lower load holding steel plate I. Each screw rod II is sleeved with a spring, the upper end of the spring is tightly abutted to the lower surface of the upper load-holding steel plate I, and the lower end of the spring is tightly abutted to the clamping piece.
And a screw rod III is arranged in a through hole in the central point of the upper load-holding steel plate I in a penetrating manner, a nut is screwed into the upper end of the screw rod III, and the nut is tightly propped against the upper surface of the upper load-holding steel plate I. The lower end of the screw rod III is connected with a steel bar meter, and the lower end of the steel bar meter is connected with a tension steel bar.
The lower end of the tension steel bar is connected with a U-shaped steel plate, another U-shaped steel plate is arranged right below the U-shaped steel plate, the openings of the two U-shaped steel plates are opposite, and a cement-based material test block is clamped between the two U-shaped steel plates.
The lower end of the lower U-shaped steel plate is connected with a screw IV which penetrates through a through hole in the center point of the lower load-holding steel plate I. And a nut is screwed into the lower end of the screw IV and is tightly propped against the lower surface of the lower load-holding steel plate I.
A cement-based material continuous load loading device for a durability test comprises a reaction frame, a pressure sensor, a jack and a pressure load holding device.
The reaction frame comprises a top plate, a bottom plate and four screw rods I, wherein the top plate is located right above the bottom plate. The top plate and the bottom plate are rectangular plates which are horizontally arranged, four through holes are formed in the two rectangular plates, and the four through holes are located in four corners of each rectangular plate respectively. Four screw rod I passes four through-holes of roof and four through-holes of bottom plate, fixes the roof in the upper end of every screw rod I through the nut, fixes the bottom plate at the lower extreme of every screw rod I through the nut to form inside hollow frame body.
The lower surface of the top plate is connected with a pressure sensor, and the lower end of the pressure sensor is connected with a jack. The lower end of the jack is connected with an inner support, the upper surface of the bottom plate is connected with another inner support, and a pressure load supporting device is connected between the two inner supports.
The pressed load-holding device comprises an upper load-holding steel plate II, a lower load-holding steel plate III and eight screws V. The lower end of the upper inner support is connected with an upper load-supporting steel plate II, the upper end of the lower inner support is connected with a lower load-supporting steel plate III, and the lower load-supporting steel plate II is positioned between the upper load-supporting steel plate II and the lower load-supporting steel plate III.
The upper load holding steel plate II, the lower load holding steel plate II and the lower load holding steel plate III are rectangular plates which are horizontally arranged, eight through holes are formed in the upper load holding steel plate II and the lower load holding steel plate II, and the eight through holes comprise four through holes I and four through holes II. Four through-hole I is located four angles of place rectangular plate respectively, and the mid point department of two adjacent through-holes I is provided with a through-hole II.
Nine through holes are formed in the lower load-holding steel plate III and comprise four through holes I, four through holes II and a through hole III. Four through-holes I are respectively located four angles of holding lotus steel sheet III down, and the midpoint department of two adjacent through-holes I is provided with a through-hole II, and through-hole III is located the central point of holding lotus steel sheet III down.
Four screws V penetrate through four through holes I on an upper load holding steel plate II, a lower load holding steel plate II and a lower load holding steel plate III, and the other four screws V penetrate through four through holes II on the upper load holding steel plate II, the lower load holding steel plate II and the lower load holding steel plate III.
And three nuts are screwed into each screw V, the first nut is tightly propped against the upper surface of the upper load-holding steel plate II, the second nut is tightly propped against the upper surface of the lower load-holding steel plate III, and the third nut is tightly propped against the lower surface of the lower load-holding steel plate III.
And a reinforcing steel bar meter is arranged on each screw rod V and is positioned between the upper load holding steel plate II and the lower load holding steel plate II. Each screw rod V is sleeved with a spring, the upper end of the spring is tightly propped against the lower surface of the lower load holding steel plate II, and the lower end of the spring is tightly propped against a nut on the upper surface of the lower load holding steel plate III.
And a screw rod VI penetrates through a through hole in the central point of the lower load holding steel plate III, and a gap S exists between the upper end of the screw rod VI and the lower surface of the lower load holding steel plate II. And two nuts are screwed into the screw rod VI, the first nut is tightly propped against the upper surface of the lower load-holding steel plate III, and the second nut is tightly propped against the lower surface of the lower load-holding steel plate III. And a spring is sleeved on the screw rod VI, the upper end of the spring is tightly propped against the lower surface of the lower load holding steel plate II, and the lower end of the spring is tightly propped against a nut on the upper surface of the lower load holding steel plate III.
Three cement-based material test blocks are clamped between the upper load holding steel plate II and the lower load holding steel plate II, the three cement-based material test blocks are overlapped together along the vertical direction, and a steel partition plate is clamped between every two adjacent cement-based material test blocks.
Furthermore, the U-shaped steel plate comprises a rectangular bottom steel plate and two side plates, and one plate surface of the bottom steel plate is connected with the two side plates. The two side plates are parallel to each other and are respectively close to two non-adjacent edges of the bottom steel plate.
The inner side of each side plate is provided with a plurality of shear keys. The two U-shaped steel plates and the cement-based material test block are poured into a whole, and the plurality of shear connectors extend into the cement-based material test block.
Further, in the cement-based material continuous loading device for the durability test, except for the cement-based material test block, the outer surfaces of all the parts are provided with protective coatings.
Further, the nut is a locknut.
Further, the free length of the spring is L, the height of the gap S is H, H > 0.2L > 0.
The beneficial effects of the utility model reside in that:
1. the utility model uses the jack and the pressure sensor, and can accurately control the magnitude of the loading force, thereby improving the accuracy of the test result;
2. the load holding device of the utility model has smaller volume and can be used for large-batch contrast tests;
3. the utility model discloses a reinforcing bar meter control reinforcing bar and the tensile size of screw rod can in time discover reinforcing bar and the tensile loss of screw rod to mend and carry, ensured the atress invariant of cement-based material test block, accurate simulation out cement-based material's the atress condition among the actual conditions, further improve the accuracy of test result.
Drawings
FIG. 1 is a schematic view of a cement-based material tension load loading device for a cement-based material durability test;
FIG. 2 is a schematic view of a cement-based material compressive load loading device for a cement-based material durability test;
FIG. 3 is a schematic view of a U-shaped steel and a cement-based material test block poured into a whole;
FIG. 4 is a schematic view of an upper load-bearing steel plate I;
FIG. 5 is a schematic view of a lower load-bearing steel plate I;
FIG. 6 is a schematic view of an upper load-bearing steel plate II;
FIG. 7 is a schematic view of a lower load-holding steel plate II;
FIG. 8 is a schematic view of a bottom load steel plate III.
In the figure: the device comprises a pressure sensor 1, a jack 2, a top plate 3, a bottom plate 4, a screw I5, a nut 6, an inner support 7, an upper load-holding steel plate I8, a lower load-holding steel plate I9, a screw II 10, a clamping piece 11, a spring 12, a screw III 13, a reinforcing steel bar meter 14, a tensile reinforcing steel bar 15, a U-shaped steel 16, a bottom steel plate 1601, a side plate 1602, a shear key 1603, a cement-based material test block 17, a screw IV 18, an upper load-holding steel plate II 19, a lower load-holding steel plate II 20, a lower load-holding steel plate III 21, a screw V22, a screw VI 23 and a steel partition plate 24.
Detailed Description
The present invention will be further described with reference to the following examples, but it should not be construed that the scope of the present invention is limited to the following examples. Various substitutions and modifications can be made without departing from the technical spirit of the invention and according to the common technical knowledge and conventional means in the field, and all shall be included in the scope of the invention.
Example 1:
the embodiment discloses a continuous loading device for a cement-based material in a durability test, which comprises a reaction frame, a pressure sensor 1, a jack 2 and a tension loading device.
Referring to fig. 1, the reaction frame comprises a top plate 3, a bottom plate 4 and four screws i 5, wherein the top plate 3 is positioned right above the bottom plate 4. Roof 3 and bottom plate 4 are the rectangular plate of level setting, all are provided with four through-holes on these two rectangular plates, and four through-holes are located four angles of rectangular plate respectively. Four screw rod I5 passes four through-holes of roof 3 and four through-holes of bottom plate 4, fixes roof 3 in the upper end of every screw rod I5 through nut 6, fixes bottom plate 4 at the lower extreme of every screw rod I5 through nut 6 to form inside hollow frame body. The nut 6 is a locknut.
The lower surface of the top plate 3 is connected with a pressure sensor 1, and the lower end of the pressure sensor 1 is connected with a jack 2. The lower end of the jack 2 is connected with an inner support 7, the upper surface of the bottom plate 4 is connected with another inner support 7, and a tension load supporting device is connected between the two inner supports 7.
Referring to fig. 1, the tension load-holding device comprises an upper load-holding steel plate I8, a lower load-holding steel plate I9, four screw rods II 10 and two U-shaped steel plates 16. The lower end of the upper inner support 7 is connected with an upper load-supporting steel plate I8, and the upper end of the lower inner support 7 is connected with a lower load-supporting steel plate I9.
The upper load-holding steel plate I8 and the lower load-holding steel plate I9 are both rectangular plates which are horizontally arranged, and the upper load-holding steel plate I8 is positioned right above the lower load-holding steel plate I9. Referring to fig. 4 or 5, five through holes are formed in the upper load holding steel plate i 8 and the lower load holding steel plate i 9, four of the through holes are located at four corners of the rectangular plate, and one through hole is located at the center point of the rectangular plate.
The upper ends of the four screw rods II 10 penetrate through holes in four corners of the upper load holding steel plate I8, and the lower ends of the four screw rods II 10 penetrate through holes in four corners of the lower load holding steel plate I9. Two nuts 6 are screwed into each screw II 10, one nut 6 is tightly propped against the upper surface of the upper load-holding steel plate I8, and the other nut 6 is tightly propped against the upper surface of the lower load-holding steel plate I9.
Each screw II 10 is provided with a clamping piece 11, and the clamping piece 11 is positioned between the upper load holding steel plate I8 and the lower load holding steel plate I9. Each screw II 10 is sleeved with a spring 12, the upper end of each spring 12 is tightly abutted to the lower surface of the upper load-holding steel plate I8, and the lower end of each spring 12 is tightly abutted to the clamping piece 11.
A screw III 13 penetrates through a through hole in the central point of the upper load-holding steel plate I8, the upper end of the screw III 13 is screwed into a nut 6, and the nut 6 is tightly abutted to the upper surface of the upper load-holding steel plate I8. The lower end of the screw III 13 is connected with a steel bar meter 14, and the lower end of the steel bar meter 14 is connected with a tension steel bar 15. The diameters of the through holes of the upper load-holding steel plate I8 are slightly larger than the diameters of the screw II 10 and the screw III 13, namely the upper load-holding steel plate I8 can move up and down along the screw II 10 and the screw III 13.
The lower end of the tension steel bar 15 is connected with a U-shaped steel plate 16, another U-shaped steel plate 16 is arranged right below the U-shaped steel plate 16, the openings of the two U-shaped steel plates 16 are opposite, and a cement-based material test block 17 is clamped between the two U-shaped steel plates 16.
Referring to fig. 3, the U-shaped steel plate 16 includes a rectangular bottom steel plate 1601 and two side plates 1602, and one plate surface of the bottom steel plate 1601 is connected to the two side plates 1602. The two side plates 1602 are parallel to each other, and the two side plates 1602 are close to two non-adjacent edges of the bottom steel plate 1601 respectively.
A plurality of shear keys 1603 are arranged on the inner side of each side plate 1602. The two U-shaped steel plates 16 and the cement-based material test block 17 are poured into a whole, and the plurality of shear keys 1603 extend into the cement-based material test block 17.
The lower end of the lower U-shaped steel plate 16 is connected with a screw IV 18, and the screw IV 18 penetrates through a through hole in the center point of the lower load-holding steel plate I9. The lower end of the screw IV 18 is screwed into a nut 6, and the nut 6 is tightly propped against the lower surface of the lower load-holding steel plate I9.
In the cement-based material continuous loading device for the durability test, except for the cement-based material test block 17, the outer surfaces of all parts are provided with protective coatings.
During operation, the pressure sensor 1 controls the jack 2 to apply downward pressure to the upper load-holding steel plate I8, and the upper load-holding steel plate I8 moves downwards, so that the four springs 12 are compressed. When the required load is reached, the five nuts 6 above the upper load-holding steel plate I8 are screwed downwards, so that the nuts 6 are tightly pressed against the upper surface of the upper load-holding steel plate I8 again. The pressure of the jack 2 is unloaded, and the spring 12 in a compressed state enables the two U-shaped steel plates 16 to generate tension in opposite directions, so that the tension is applied to the cement-based material test block 17.
In the load-holding durability test, a part of the tensile force applied to the cement-based material test block 17 is lost due to the creep action of the cement-based material and the loss of the elastic force of the spring. The tension of the tensioned reinforcing steel bar 15 is periodically measured by the reinforcing steel bar meter 14, the measuring frequency is once every ten days, and the stress loss and the stress relaxation of the load holding device are observed. If a loss of tensile load is detected, the tensile load-holding device should be supplemented by the jack 2.
Example 2:
the embodiment discloses a continuous loading device for a cement-based material in a durability test, which comprises a reaction frame, a pressure sensor 1, a jack 2 and a pressure loading device.
Referring to fig. 2, the reaction frame comprises a top plate 3, a bottom plate 4 and four screws i 5, wherein the top plate 3 is positioned right above the bottom plate 4. Roof 3 and bottom plate 4 are the rectangular plate of level setting, all are provided with four through-holes on these two rectangular plates, and four through-holes are located four angles of rectangular plate respectively. Four screw rod I5 passes four through-holes of roof 3 and four through-holes of bottom plate 4, fixes roof 3 in the upper end of every screw rod I5 through nut 6, fixes bottom plate 4 at the lower extreme of every screw rod I5 through nut 6 to form inside hollow frame body. The nut 6 is a locknut.
The lower surface of the top plate 3 is connected with a pressure sensor 1, and the lower end of the pressure sensor 1 is connected with a jack 2. The lower end of the jack 2 is connected with an inner support 7, the upper surface of the bottom plate 4 is connected with another inner support 7, and a pressure load supporting device is connected between the two inner supports 7.
Referring to fig. 2, the pressure load-bearing device comprises an upper load-bearing steel plate II 19, a lower load-bearing steel plate II 20, a lower load-bearing steel plate III 21 and eight screws V22. The lower end of the upper inner support 7 is connected with an upper load-supporting steel plate II 19, the upper end of the lower inner support 7 is connected with a lower load-supporting steel plate III 21, and a lower load-supporting steel plate II 20 is located between the upper load-supporting steel plate II 19 and the lower load-supporting steel plate III 21.
The upper load holding steel plate II 19, the lower load holding steel plate II 20 and the lower load holding steel plate III 21 are all rectangular plates which are horizontally arranged. Referring to fig. 6 or 7, eight through holes are formed in the upper load holding steel plate ii 19 and the lower load holding steel plate ii 20, and the eight through holes comprise four through holes i and four through holes ii. Four through-hole I is located four angles of place rectangular plate respectively, and the mid point department of two adjacent through-holes I is provided with a through-hole II.
Referring to fig. 8, nine through holes are formed in the lower load-holding steel plate iii 21, and the nine through holes include four through holes i, four through holes ii, and one through hole iii. The four through holes I are respectively positioned at four corners of the lower load holding steel plate III 21, a through hole II is arranged at the middle point of each two adjacent through holes I, and the through hole III is positioned at the central point of the lower load holding steel plate III 21.
Four screws V22 penetrate through four through holes I on an upper load holding steel plate II 19, a lower load holding steel plate II 20 and a lower load holding steel plate III 21, and the other four screws V22 penetrate through four through holes II on the upper load holding steel plate II 19, the lower load holding steel plate II 20 and the lower load holding steel plate III 21.
Referring to fig. 2, three nuts 6 are screwed into each screw v 22, the first nut 6 is tightly pressed against the upper surface of the upper load-holding steel plate ii 19, the second nut 6 is tightly pressed against the upper surface of the lower load-holding steel plate iii 21, and the third nut 6 is tightly pressed against the lower surface of the lower load-holding steel plate iii 21.
Each screw V22 is provided with a reinforcing steel bar meter 14, and the reinforcing steel bar meter 14 is positioned between the upper load-holding steel plate II 19 and the lower load-holding steel plate II 20. Each screw rod V22 is sleeved with a spring 12, the upper end of each spring 12 is tightly propped against the lower surface of the lower load holding steel plate II 20, and the lower end of each spring 12 is tightly propped against the nut 6 on the upper surface of the lower load holding steel plate III 21.
Referring to fig. 2, a screw rod VI 23 penetrates through a through hole in the central point of the lower load-holding steel plate III 21, a gap S exists between the upper end of the screw rod VI 23 and the lower surface of the lower load-holding steel plate II 20, two nuts 6 are screwed into the screw rod VI 23, the first nut 6 abuts against the upper surface of the lower load-holding steel plate III 21, the second nut 6 abuts against the lower surface of the lower load-holding steel plate III 21, a spring 12 is sleeved on the screw rod VI 23, the upper end of the spring 12 abuts against the lower surface of the lower load-holding steel plate II 20, the lower end of the spring 12 abuts against the nut 6 on the upper surface of the lower load-holding steel plate III 21, the free length of the spring 12 is L, the height of the gap S is H, and H is more than 0.2L.
Three cement-based material test blocks 17 are arranged between the upper load-holding steel plate II 19 and the lower load-holding steel plate II 20 in a clamping mode, the three cement-based material test blocks 17 are overlapped together in the vertical direction, and a steel partition plate 24 is arranged between every two adjacent cement-based material test blocks 17 in a clamping mode.
In the cement-based material continuous loading device for the durability test, except for the cement-based material test block 17, the outer surfaces of all parts are provided with protective coatings.
When the pressure sensor works, the pressure sensor 1 controls the jack 2 to apply downward pressure to the upper load-holding steel plate II 19, and the upper load-holding steel plate II 19 and the lower load-holding steel plate II 20 both move downwards, so that the nine springs 12 below the lower load-holding steel plate II 20 are compressed. When the required load is reached, the eight nuts 6 above the upper load-holding steel plate II 19 are screwed downwards, so that the nuts 6 are tightly pressed against the upper surface of the upper load-holding steel plate II 19 again. The pressure of the jack 2 is relieved and the spring 12 in a compressed state applies pressure to the cement-based material test block 17 and the steel diaphragm 24.
In the load-holding durability test, a part of the pressure applied to the cement-based material test block 17 is lost due to the creep action of the cement-based material and the loss of the elastic force of the spring. The pressure of the screw v 22 is periodically measured by the reinforcing bar meter 14, the measurement frequency is once every ten days, and no stress loss and stress relaxation of the load holding device are observed. If a loss of tensile load is detected, the tensile load-holding device should be supplemented by the jack 2.
Example 3:
the embodiment discloses a continuous loading device for a cement-based material in a durability test, which comprises a reaction frame, a pressure sensor 1, a jack 2 and a tension loading device.
Referring to fig. 1, the reaction frame comprises a top plate 3, a bottom plate 4 and four screws i 5, wherein the top plate 3 is positioned right above the bottom plate 4. Roof 3 and bottom plate 4 are the rectangular plate of level setting, all are provided with four through-holes on these two rectangular plates, and four through-holes are located four angles of rectangular plate respectively. Four screw rod I5 passes four through-holes of roof 3 and four through-holes of bottom plate 4, fixes roof 3 in the upper end of every screw rod I5 through nut 6, fixes bottom plate 4 at the lower extreme of every screw rod I5 through nut 6 to form inside hollow frame body.
The lower surface of the top plate 3 is connected with a pressure sensor 1, and the lower end of the pressure sensor 1 is connected with a jack 2. The lower end of the jack 2 is connected with an inner support 7, the upper surface of the bottom plate 4 is connected with another inner support 7, and a tension load supporting device is connected between the two inner supports 7.
Referring to fig. 1, the tension load-holding device comprises an upper load-holding steel plate I8, a lower load-holding steel plate I9, four screw rods II 10 and two U-shaped steel plates 16. The lower end of the upper inner support 7 is connected with an upper load-supporting steel plate I8, and the upper end of the lower inner support 7 is connected with a lower load-supporting steel plate I9.
The upper load-holding steel plate I8 and the lower load-holding steel plate I9 are both rectangular plates which are horizontally arranged, and the upper load-holding steel plate I8 is positioned right above the lower load-holding steel plate I9. Referring to fig. 4 or 5, five through holes are formed in the upper load holding steel plate i 8 and the lower load holding steel plate i 9, four of the through holes are located at four corners of the rectangular plate, and one through hole is located at the center point of the rectangular plate.
The upper ends of the four screw rods II 10 penetrate through holes in four corners of the upper load holding steel plate I8, and the lower ends of the four screw rods II 10 penetrate through holes in four corners of the lower load holding steel plate I9. Two nuts 6 are screwed into each screw II 10, one nut 6 is tightly propped against the upper surface of the upper load-holding steel plate I8, and the other nut 6 is tightly propped against the upper surface of the lower load-holding steel plate I9.
Referring to fig. 1, each screw rod ii 10 is provided with a clamping member 11, and the clamping member 11 is located between an upper load holding steel plate i 8 and a lower load holding steel plate i 9. Each screw II 10 is sleeved with a spring 12, the upper end of each spring 12 is tightly abutted to the lower surface of the upper load-holding steel plate I8, and the lower end of each spring 12 is tightly abutted to the clamping piece 11.
A screw III 13 penetrates through a through hole in the central point of the upper load-holding steel plate I8, the upper end of the screw III 13 is screwed into a nut 6, and the nut 6 is tightly abutted to the upper surface of the upper load-holding steel plate I8. The lower end of the screw III 13 is connected with a steel bar meter 14, and the lower end of the steel bar meter 14 is connected with a tension steel bar 15.
The lower end of the tension steel bar 15 is connected with a U-shaped steel plate 16, another U-shaped steel plate 16 is arranged right below the U-shaped steel plate 16, the openings of the two U-shaped steel plates 16 are opposite, and a cement-based material test block 17 is clamped between the two U-shaped steel plates 16.
The lower end of the lower U-shaped steel plate 16 is connected with a screw IV 18, and the screw IV 18 penetrates through a through hole in the center point of the lower load-holding steel plate I9. The lower end of the screw IV 18 is screwed into a nut 6, and the nut 6 is tightly propped against the lower surface of the lower load-holding steel plate I9.
During operation, the pressure sensor 1 controls the jack 2 to apply downward pressure to the upper load-holding steel plate I8, and the upper load-holding steel plate I8 moves downwards, so that the four springs 12 are compressed. When the required load is reached, the five nuts 6 above the upper load-holding steel plate I8 are screwed downwards, so that the nuts 6 are tightly pressed against the upper surface of the upper load-holding steel plate I8 again. The pressure of the jack 2 is unloaded, and the spring 12 in a compressed state enables the two U-shaped steel plates 16 to generate tension in opposite directions, so that the tension is applied to the cement-based material test block 17.
In the load-holding durability test, a part of the tensile force applied to the cement-based material test block 17 is lost due to the creep action of the cement-based material and the loss of the elastic force of the spring. The tension of the tensioned reinforcing steel bar 15 is periodically measured by the reinforcing steel bar meter 14, the measuring frequency is once every ten days, and the stress loss and the stress relaxation of the load holding device are observed. If a loss of tensile load is detected, the tensile load-holding device should be supplemented by the jack 2.
Example 4:
the main structure of this embodiment is the same as that of embodiment 3, and further, referring to fig. 3, the U-shaped steel plate 16 includes a rectangular bottom steel plate 1601 and two side plates 1602, and one plate surface of the bottom steel plate 1601 is connected to the two side plates 1602. The two side plates 1602 are parallel to each other, and the two side plates 1602 are close to two non-adjacent edges of the bottom steel plate 1601 respectively.
A plurality of shear keys 1603 are arranged on the inner side of each side plate 1602. The two U-shaped steel plates 16 and the cement-based material test block 17 are poured into a whole, and the plurality of shear keys 1603 extend into the cement-based material test block 17.
Example 5:
the main structure of this embodiment is the same as that of embodiment 4, and further, in the continuous loading device of cement-based material for durability test, the outer surfaces of all the parts except the test block 17 of cement-based material are provided with protective coatings.
Example 6:
the main structure of this embodiment is the same as that of embodiment 5, and further, the nut 6 is a locknut.
Example 7:
the embodiment discloses a continuous loading device for a cement-based material in a durability test, which comprises a reaction frame, a pressure sensor 1, a jack 2 and a pressure loading device.
Referring to fig. 2, the reaction frame comprises a top plate 3, a bottom plate 4 and four screws i 5, wherein the top plate 3 is positioned right above the bottom plate 4. Roof 3 and bottom plate 4 are the rectangular plate of level setting, all are provided with four through-holes on these two rectangular plates, and four through-holes are located four angles of rectangular plate respectively. Four screw rod I5 passes four through-holes of roof 3 and four through-holes of bottom plate 4, fixes roof 3 in the upper end of every screw rod I5 through nut 6, fixes bottom plate 4 at the lower extreme of every screw rod I5 through nut 6 to form inside hollow frame body.
The lower surface of the top plate 3 is connected with a pressure sensor 1, and the lower end of the pressure sensor 1 is connected with a jack 2. The lower end of the jack 2 is connected with an inner support 7, the upper surface of the bottom plate 4 is connected with another inner support 7, and a pressure load supporting device is connected between the two inner supports 7.
Referring to fig. 1, the pressure load-bearing device comprises an upper load-bearing steel plate II 19, a lower load-bearing steel plate II 20, a lower load-bearing steel plate III 21 and eight screws V22. The lower end of the upper inner support 7 is connected with an upper load-supporting steel plate II 19, the upper end of the lower inner support 7 is connected with a lower load-supporting steel plate III 21, and a lower load-supporting steel plate II 20 is located between the upper load-supporting steel plate II 19 and the lower load-supporting steel plate III 21.
The upper load holding steel plate II 19, the lower load holding steel plate II 20 and the lower load holding steel plate III 21 are all rectangular plates which are horizontally arranged. Referring to fig. 6 or 7, eight through holes are formed in the upper load holding steel plate ii 19 and the lower load holding steel plate ii 20, and the eight through holes comprise four through holes i and four through holes ii. Four through-hole I is located four angles of place rectangular plate respectively, and the mid point department of two adjacent through-holes I is provided with a through-hole II.
Referring to fig. 8, nine through holes are formed in the lower load-holding steel plate iii 21, and the nine through holes include four through holes i, four through holes ii, and one through hole iii. The four through holes I are respectively positioned at four corners of the lower load holding steel plate III 21, a through hole II is arranged at the middle point of each two adjacent through holes I, and the through hole III is positioned at the central point of the lower load holding steel plate III 21.
Four screws V22 penetrate through four through holes I on an upper load holding steel plate II 19, a lower load holding steel plate II 20 and a lower load holding steel plate III 21, and the other four screws V22 penetrate through four through holes II on the upper load holding steel plate II 19, the lower load holding steel plate II 20 and the lower load holding steel plate III 21.
Referring to fig. 2, three nuts 6 are screwed into each screw v 22, the first nut 6 is tightly pressed against the upper surface of the upper load-holding steel plate ii 19, the second nut 6 is tightly pressed against the upper surface of the lower load-holding steel plate iii 21, and the third nut 6 is tightly pressed against the lower surface of the lower load-holding steel plate iii 21.
Each screw V22 is provided with a reinforcing steel bar meter 14, and the reinforcing steel bar meter 14 is positioned between the upper load-holding steel plate II 19 and the lower load-holding steel plate II 20. Each screw rod V22 is sleeved with a spring 12, the upper end of each spring 12 is tightly propped against the lower surface of the lower load holding steel plate II 20, and the lower end of each spring 12 is tightly propped against the nut 6 on the upper surface of the lower load holding steel plate III 21.
And a screw rod VI 23 penetrates through a through hole in the central point of the lower load-holding steel plate III 21, and a gap exists between the upper end of the screw rod VI 23 and the lower surface of the lower load-holding steel plate II 20. Two nuts 6 are screwed into the screw rod VI 23, the first nut 6 is tightly propped against the upper surface of the lower load-holding steel plate III 21, and the second nut 6 is tightly propped against the lower surface of the lower load-holding steel plate III 21. The screw rod VI 23 is sleeved with a spring 12, the upper end of the spring 12 is tightly propped against the lower surface of the lower load holding steel plate II 20, and the lower end of the spring 12 is tightly propped against the nut 6 on the upper surface of the lower load holding steel plate III 21.
Three cement-based material test blocks 17 are arranged between the upper load-holding steel plate II 19 and the lower load-holding steel plate II 20 in a clamping mode, the three cement-based material test blocks 17 are overlapped together in the vertical direction, and a steel partition plate 24 is arranged between every two adjacent cement-based material test blocks 17 in a clamping mode.
When the pressure sensor works, the pressure sensor 1 controls the jack 2 to apply downward pressure to the upper load-holding steel plate II 19, and the upper load-holding steel plate II 19 and the lower load-holding steel plate II 20 both move downwards, so that the nine springs 12 below the lower load-holding steel plate II 20 are compressed. When the required load is reached, the eight nuts 6 above the upper load-holding steel plate II 19 are screwed downwards, so that the nuts 6 are tightly pressed against the upper surface of the upper load-holding steel plate II 19 again. The pressure of the jack 2 is relieved and the spring 12 in a compressed state applies pressure to the cement-based material test block 17 and the steel diaphragm 24.
In the load-holding durability test, a part of the pressure applied to the cement-based material test block 17 is lost due to the creep action of the cement-based material and the loss of the elastic force of the spring. The pressure of the screw v 22 is periodically measured by the reinforcing bar meter 14, the measurement frequency is once every ten days, and no stress loss and stress relaxation of the load holding device are observed. If a loss of tensile load is detected, the tensile load-holding device should be supplemented by the jack 2.
Example 8:
the main structure of this embodiment is the same as that of embodiment 7, and further, in the continuous loading device of cement-based material for durability test, the outer surfaces of all the parts except the test block 17 of cement-based material are provided with protective coatings.
Example 9:
the main structure of this embodiment is the same as that of embodiment 8, and further, the nut 6 is a locknut.
Claims (6)
1. A cement-based material continuous loading device for durability test is characterized in that: comprises a reaction frame, a pressure sensor (1), a jack (2) and a tension load-holding device;
the reaction frame comprises a top plate (3), a bottom plate (4) and four screw rods I (5), wherein the top plate (3) is positioned right above the bottom plate (4); the top plate (3) and the bottom plate (4) are both horizontally arranged rectangular plates, four through holes are formed in the two rectangular plates, and the four through holes are respectively located at four corners of each rectangular plate; the four screw rods I (5) penetrate through the four through holes of the top plate (3) and the four through holes of the bottom plate (4), the top plate (3) is fixed to the upper end of each screw rod I (5) through nuts (6), and the bottom plate (4) is fixed to the lower end of each screw rod I (5) through nuts (6), so that a frame body with a hollow interior is formed;
the lower surface of the top plate (3) is connected with a pressure sensor (1), and the lower end of the pressure sensor (1) is connected with a jack (2); the lower end of the jack (2) is connected with an inner support (7), the upper surface of the bottom plate (4) is connected with another inner support (7), and a tension load supporting device is connected between the two inner supports (7);
the tension load-holding device comprises an upper load-holding steel plate I (8), a lower load-holding steel plate I (9), four screw rods II (10) and two U-shaped steel plates (16); the lower end of the upper inner support (7) is connected with an upper load-supporting steel plate I (8), and the upper end of the lower inner support (7) is connected with a lower load-supporting steel plate I (9);
the upper load-holding steel plate I (8) and the lower load-holding steel plate I (9) are both horizontally arranged rectangular plates, and the upper load-holding steel plate I (8) is positioned right above the lower load-holding steel plate I (9); the upper load-holding steel plate I (8) and the lower load-holding steel plate I (9) are respectively provided with five through holes, wherein four through holes are respectively positioned at four corners of the rectangular plate, and one through hole is positioned at the central point of the rectangular plate;
the upper ends of the four screw rods II (10) penetrate through holes in four corners of the upper load holding steel plate I (8), and the lower ends of the four screw rods II (10) penetrate through holes in four corners of the lower load holding steel plate I (9); two nuts (6) are screwed into each screw II (10), one nut (6) is tightly propped against the upper surface of the upper load-holding steel plate I (8), and the other nut (6) is tightly propped against the upper surface of the lower load-holding steel plate I (9);
each screw II (10) is provided with a clamping piece (11), and the clamping piece (11) is positioned between the upper load holding steel plate I (8) and the lower load holding steel plate I (9); each screw II (10) is sleeved with a spring (12), the upper end of each spring (12) is tightly abutted against the lower surface of the upper load-holding steel plate I (8), and the lower end of each spring (12) is tightly abutted against the clamping piece (11);
a screw III (13) penetrates through a through hole in the center point of the upper load-holding steel plate I (8), a nut (6) is screwed into the upper end of the screw III (13), and the nut (6) is tightly abutted to the upper surface of the upper load-holding steel plate I (8); the lower end of the screw III (13) is connected with a steel bar meter (14), and the lower end of the steel bar meter (14) is connected with a tension steel bar (15);
the lower end of the tension steel bar (15) is connected with a U-shaped steel plate (16), another U-shaped steel plate (16) is arranged right below the U-shaped steel plate (16), the openings of the two U-shaped steel plates (16) are opposite, and a cement-based material test block (17) is clamped between the two U-shaped steel plates (16);
the lower end of the lower U-shaped steel plate (16) is connected with a screw IV (18), and the screw IV (18) penetrates through a through hole in the center point of the lower load-holding steel plate I (9); the lower end of the screw IV (18) is screwed into a nut (6), and the nut (6) is tightly propped against the lower surface of the lower load-holding steel plate I (9).
2. The cement-based material continuous loading device for the durability test according to claim 1, wherein: the U-shaped steel plate (16) comprises a rectangular bottom steel plate (1601) and two side plates (1602), and one plate surface of the bottom steel plate (1601) is connected with the two side plates (1602); the two side plates (1602) are parallel to each other, and the two side plates (1602) are respectively close to two nonadjacent edges of the bottom steel plate (1601);
a plurality of shear keys (1603) are arranged on the inner side of each side plate (1602); the two U-shaped steel plates (16) and the cement-based material test block (17) are poured into a whole, and the plurality of shear keys (1603) extend into the cement-based material test block (17).
3. A cement-based material continuous loading device for durability test is characterized in that: comprises a reaction frame, a pressure sensor (1), a jack (2) and a pressure load-holding device;
the reaction frame comprises a top plate (3), a bottom plate (4) and four screw rods I (5), wherein the top plate (3) is positioned right above the bottom plate (4); the top plate (3) and the bottom plate (4) are both horizontally arranged rectangular plates, four through holes are formed in the two rectangular plates, and the four through holes are respectively located at four corners of each rectangular plate; the four screw rods I (5) penetrate through the four through holes of the top plate (3) and the four through holes of the bottom plate (4), the top plate (3) is fixed to the upper end of each screw rod I (5) through nuts (6), and the bottom plate (4) is fixed to the lower end of each screw rod I (5) through nuts (6), so that a frame body with a hollow interior is formed;
the lower surface of the top plate (3) is connected with a pressure sensor (1), and the lower end of the pressure sensor (1) is connected with a jack (2); the lower end of the jack (2) is connected with an inner support (7), the upper surface of the bottom plate (4) is connected with another inner support (7), and a pressure bearing device is connected between the two inner supports (7);
the pressure load-holding device comprises an upper load-holding steel plate II (19), a lower load-holding steel plate II (20), a lower load-holding steel plate III (21) and eight screws V (22); the lower end of the upper inner support (7) is connected with an upper load-supporting steel plate II (19), the upper end of the lower inner support (7) is connected with a lower load-supporting steel plate III (21), and the lower load-supporting steel plate II (20) is positioned between the upper load-supporting steel plate II (19) and the lower load-supporting steel plate III (21);
the upper load holding steel plate II (19), the lower load holding steel plate II (20) and the lower load holding steel plate III (21) are all rectangular plates which are horizontally arranged, eight through holes are formed in the upper load holding steel plate II (19) and the lower load holding steel plate II (20), and the eight through holes comprise four through holes I and four through holes II; the four through holes I are respectively positioned at four corners of the rectangular plate, and a through hole II is arranged at the midpoint of two adjacent through holes I;
nine through holes are formed in the lower load-holding steel plate III (21), and the nine through holes comprise four through holes I, four through holes II and one through hole III; the four through holes I are respectively positioned at four corners of the lower load-holding steel plate III (21), a through hole II is arranged at the midpoint of two adjacent through holes I, and the through hole III is positioned at the central point of the lower load-holding steel plate III (21);
four screws V (22) penetrate through four through holes I on an upper load-holding steel plate II (19), a lower load-holding steel plate II (20) and a lower load-holding steel plate III (21), and the other four screws V (22) penetrate through four through holes II on the upper load-holding steel plate II (19), the lower load-holding steel plate II (20) and the lower load-holding steel plate III (21);
three nuts (6) are screwed into each screw rod V (22), the first nut (6) is tightly propped against the upper surface of the upper load-holding steel plate II (19), the second nut (6) is tightly propped against the upper surface of the lower load-holding steel plate III (21), and the third nut (6) is tightly propped against the lower surface of the lower load-holding steel plate III (21);
each screw V (22) is provided with a steel bar meter (14), and the steel bar meter (14) is positioned between the upper load holding steel plate II (19) and the lower load holding steel plate II (20);
a screw VI (23) penetrates through a through hole in the center point of the lower load-holding steel plate III (21), and a gap S exists between the upper end of the screw VI (23) and the lower surface of the lower load-holding steel plate II (20); two nuts (6) are screwed into the screw rod VI (23), the first nut (6) is tightly propped against the upper surface of the lower load-holding steel plate III (21), and the second nut (6) is tightly propped against the lower surface of the lower load-holding steel plate III (21);
the upper ends of the screw rods VI (23) and each screw rod V (22) are sleeved with springs (12), the upper ends of the springs (12) are tightly propped against the lower surface of the lower load-holding steel plate II (20), and the lower ends of the springs are tightly propped against nuts (6) on the upper surface of the lower load-holding steel plate III (21);
three cement-based material test blocks (17) are arranged between the upper load holding steel plate II (19) and the lower load holding steel plate II (20) in a clamped mode, the three cement-based material test blocks (17) are stacked together in the vertical direction, and a steel partition plate (24) is arranged between every two adjacent cement-based material test blocks (17).
4. A durability-tested cement-based material continuous loading apparatus as claimed in claim 1 or 3, wherein: in the cement-based material continuous loading device for the durability test, except for the cement-based material test block (17), the outer surfaces of all parts are provided with protective coatings.
5. A durability-tested cement-based material continuous loading apparatus as claimed in claim 1 or 3, wherein: the nut (6) is a locknut.
6. A durability tested cement-based material sustained loading apparatus as claimed in claim 3 wherein said spring (12) has a free length of L, a gap S height of H > 0.2L > 0.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921585127.9U CN211061324U (en) | 2019-09-23 | 2019-09-23 | Cement-based material continuous loading device for durability test |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110702509A (en) * | 2019-09-23 | 2020-01-17 | 重庆大学 | Cement-based material continuous loading device for durability test |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110702509A (en) * | 2019-09-23 | 2020-01-17 | 重庆大学 | Cement-based material continuous loading device for durability test |
| CN110702509B (en) * | 2019-09-23 | 2024-03-12 | 重庆大学 | Cement-based material continuous loading device for durability test |
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