CN111948131A - Test device and test method for testing reinforced concrete bonding strength - Google Patents
Test device and test method for testing reinforced concrete bonding strength Download PDFInfo
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- CN111948131A CN111948131A CN202010761869.3A CN202010761869A CN111948131A CN 111948131 A CN111948131 A CN 111948131A CN 202010761869 A CN202010761869 A CN 202010761869A CN 111948131 A CN111948131 A CN 111948131A
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- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 161
- 238000012360 testing method Methods 0.000 title claims abstract description 123
- 238000010998 test method Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 113
- 239000010959 steel Substances 0.000 claims description 113
- 238000003825 pressing Methods 0.000 claims description 56
- 238000001514 detection method Methods 0.000 claims description 30
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 25
- 230000000149 penetrating effect Effects 0.000 claims description 11
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 239000004567 concrete Substances 0.000 claims description 6
- 238000010276 construction Methods 0.000 abstract description 12
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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Abstract
The invention provides a test device and a test method for testing the bonding strength of reinforced concrete, wherein the device comprises the following steps: the top of the structure base is connected with a structure top plate through a plurality of upper connecting pieces; the pushing method comprises the following steps: a fixed structure base; placing a reinforced concrete sample; placing a pressure sensor; placing an electronic dial indicator; establishing a connection through a signal processor; pushing out and loading; the drawing method comprises the following steps: a fixed structure base; placing a reinforced concrete sample; assembling a structural top plate and arranging a servo actuator; placing an electronic dial indicator; establishing a connection through a signal processor; and drawing and loading are carried out. The device has a simple structure, and can effectively meet the test requirement on the bonding strength of the reinforced concrete, thereby being beneficial to accurately testing the bearing capacity of the reinforced concrete; the method has the advantages of simple process, accurate and reliable result, capability of accurately testing the bearing capacity of the reinforced concrete, convenience for engineering application and capability of providing theoretical basis for engineering design and construction.
Description
Technical Field
The invention belongs to the technical field of constructional engineering, and particularly relates to a test device and a test method for testing the bonding strength of reinforced concrete.
Background
In the design, construction and use processes of the reinforced concrete structure, the bearing capacity of the reinforced concrete structure cannot meet the requirement of safe use due to various uncertain factors, and in the reinforced concrete structure, mutual adhesion between the steel bar and the concrete is the key of the combined action of the steel bar and the concrete, namely, the adhesion between the steel bar and the concrete enables the two materials to fully exert respective advantages, so that the bearing capacity of the reinforced concrete structure is established. The test device in the prior art has a complex structure and complex operation, and cannot effectively meet the test requirement on the bonding strength of the reinforced concrete, so that the bearing capacity of the reinforced concrete cannot be accurately tested, and a theoretical basis cannot be provided for engineering design and construction.
Disclosure of Invention
Aiming at some problems in the prior art, the invention provides a test device and a test method for testing the bonding strength of reinforced concrete, the device has a simple structure, and can effectively meet the test requirement on the bonding strength of the reinforced concrete, thereby being beneficial to accurately testing the bearing capacity of the reinforced concrete; the method has the advantages of simple process, accurate and reliable result, capability of accurately testing the bearing capacity of the reinforced concrete, convenience for engineering application and capability of providing theoretical basis for engineering design and construction.
In order to achieve the above object, the present invention provides a test apparatus for testing the bonding strength of reinforced concrete, comprising a structural base, an upper connecting member and a lower connecting member;
the structure base is vertically extended and comprises a vertical supporting piece, a base top plate fixedly connected to the top of the vertical supporting piece and a base bottom plate fixedly connected to the bottom of the vertical supporting piece; the vertical support piece comprises two middle long rib plates which are oppositely arranged, two middle short rib plates which are oppositely arranged and two pairs of outer rib plates which are respectively positioned at the outer sides of the two middle long rib plates, the two middle short rib plates are fixedly connected between the two middle long rib plates, and the two pairs of outer rib plates are respectively fixedly connected at the outer sides of the two middle long rib plates; the center of the base top plate is provided with a circular slotted hole B, and part of the edge of the base top plate is circumferentially and uniformly provided with a plurality of U-shaped slotted holes B; a plurality of circular slotted holes C are uniformly formed in the circumferential direction of the part, close to the edge, of the base bottom plate;
the number of the lower connecting pieces is multiple and is consistent with that of the circular slots C; the upper end of the lower connecting piece is inserted into the circular slotted hole C;
the number of the upper connecting pieces is a plurality, the number of the upper connecting pieces is consistent with that of the U-shaped slotted holes b, and the lower ends of the upper connecting pieces are inserted into the U-shaped slotted holes b.
The device has simple structure and low manufacturing cost, and can effectively meet the test requirement on the bonding strength of the reinforced concrete, thereby being beneficial to accurately testing the bearing capacity of the reinforced concrete.
Further, in order to guarantee the stability of the testing device, the testing device further comprises a testing platform base, wherein the testing platform base is arranged below the structure base, a plurality of circular through holes are formed in the testing platform base, the circular through holes and the circular slotted holes C are in one-to-one correspondence, the lower ends of the lower connecting pieces are respectively inserted into the circular through holes, and the testing platform base is fixedly connected with the base bottom plate.
Furthermore, in order to synchronously record data in real time during the push-out test, the device also comprises a reinforced concrete sample, a pressure sensor, a thread upper pressing plate, a thread lower pressing plate, a servo actuator, a thin steel sheet A, a universal support frame, an electronic dial indicator, a signal processor and a computer;
the part of the vertical supporting piece corresponding to the circular slotted hole B is of a hollow structure;
the reinforced concrete sample is a reinforced concrete sample to be tested and is in a cubic shape, reinforcing steel bars are embedded in the middle of the reinforced concrete sample, the reinforcing steel bars extend to the outer parts of the two opposite end faces of the reinforced concrete sample, short-section reinforcing steel bars are exposed out of one side of the reinforced concrete sample, and long-section reinforcing steel bars are exposed out of the other side of the reinforced concrete sample; the reinforced concrete sample is arranged above the top plate of the base, and the long-section steel bar penetrates through the circular slotted hole B and extends into the cavity of the vertical supporting piece;
the pressure sensor is a hollow force measuring sensor, and the upper end and the lower end of an inner cavity of the pressure sensor are both provided with an internal thread structure; the lower end of the threaded upper pressure plate and the upper end of the threaded lower pressure plate are both fixedly connected with studs and are connected to the upper end and the lower end of the pressure sensor through the studs to form a pressure detection mechanism; the pressure detection mechanism is arranged above the reinforced concrete sample, and the lower end surface of the threaded lower pressing plate is in contact with the upper end of the short section of steel bar;
the servo actuator is fixedly supported above the pressure detection mechanism, and the telescopic end of the servo actuator is downward arranged and fixedly connected with the upper end face of the threaded upper pressure plate;
the thin steel sheet A is horizontally arranged, one end of the thin steel sheet A is attached to the side face of the threaded lower pressing plate, and the other end of the thin steel sheet A extends to the outer side of the reinforced concrete sample;
the base of the universal support frame is fixedly connected to the upper end face of the base top plate, the electronic dial indicator is installed on the upper portion of the universal support frame, and the lower end of the measuring rod of the electronic dial indicator is in contact fit with the upper end face of the thin steel sheet A;
and the computer is respectively connected with the electronic dial indicator and the pressure sensor through the signal processor and is also connected with the servo actuator.
The invention has simple structure and low manufacturing cost, can conveniently carry out the push-out test of the reinforced concrete sample, can conveniently record test data, can accurately test the bearing capacity of the reinforced concrete and can provide theoretical basis for engineering design and construction.
Further, for the convenience of drawing the experiment, still include the structure roof, the structure roof sets up in the top of structure base, and its center has seted up circular slotted hole A, and the part circumference at its border is even has seted up a plurality of U-shaped slotted holes a, and circular slotted hole A and the corresponding setting of circular slotted hole B, a plurality of U-shaped slotted holes a and the corresponding setting of a plurality of U-shaped slotted holes B.
Furthermore, in order to synchronously record data in real time during the drawing test, the device also comprises a reinforced concrete sample, a pressure sensor, a perforated lower pressing plate, a perforated upper pressing plate, a servo actuator, a thin steel sheet B, a universal support frame, an electronic dial indicator, a signal processor and a computer;
the part of the vertical supporting piece corresponding to the circular slotted hole B is of a hollow structure;
the reinforced concrete sample is a reinforced concrete sample to be tested and is in a cubic shape, reinforcing steel bars are embedded in the middle of the reinforced concrete sample, the reinforcing steel bars extend to the outer parts of the two opposite end faces of the reinforced concrete sample, short-section reinforcing steel bars are exposed out of one side of the reinforced concrete sample, and long-section reinforcing steel bars are exposed out of the other side of the reinforced concrete sample; the reinforced concrete sample is arranged between the base top plate and the structure top plate, a gap is reserved between the lower end of the short section of steel bar and the upper end face of the base top plate, and the upper end of the long section of steel bar penetrates out of the upper part of the structure top plate through the circular slotted hole A;
the pressure sensor is a hollow force measuring sensor; through holes are formed in the centers of the perforated upper pressing plate and the perforated lower pressing plate and are coaxially arranged at the upper end and the lower end of the pressure sensor respectively to form a pressure detection mechanism with a hollow cavity; the pressure detection mechanism is arranged between the reinforced concrete sample and the structural top plate and is sleeved outside the long-section steel bar through a cavity in the pressure detection mechanism;
the servo actuator is fixedly supported above the structural top plate, and the telescopic end of the servo actuator is arranged downwards and is fixedly connected with the upper end of the long section of steel bar;
the thin steel sheet B is horizontally arranged, one end of the thin steel sheet B is attached to the end face of a short section of steel bar of the reinforced concrete sample, and the other end of the thin steel sheet B horizontally extends to the outer side of the reinforced concrete sample;
the base of the universal support frame is fixedly connected to the upper end face of the base top plate, the electronic dial indicator is installed on the upper portion of the universal support frame, and the lower end of the measuring rod of the electronic dial indicator is in contact fit with the upper end face of the thin steel sheet B;
and the computer is respectively connected with the electronic dial indicator and the pressure sensor through the signal processor and is also connected with the servo actuator.
The invention has simple structure and low manufacturing cost, can conveniently carry out the drawing test of the reinforced concrete sample, can conveniently record test data, can accurately test the bearing capacity of the reinforced concrete and can provide theoretical basis for engineering design and construction.
Furthermore, in order to facilitate the assembly of the test device and the disassembly of the test device, the upper connecting piece consists of an upper connecting piece screw rod, a plurality of upper connecting piece nuts respectively connected to the upper end and the lower end of the upper connecting piece screw rod and a plurality of upper connecting piece gaskets respectively sleeved on the upper end and the lower end of the upper connecting piece screw rod;
the lower connecting piece is composed of a lower connecting piece bolt, a plurality of lower connecting piece nuts connected to the lower part of the lower connecting piece bolt and a plurality of lower connecting piece gaskets respectively sleeved on the lower part of the lower connecting piece bolt.
Preferably, the base top plate and the base bottom plate are square, the number of the U-shaped slotted holes b is four, and the U-shaped slotted holes b are respectively arranged in the middle of four sides of the base top plate.
The invention also provides a test method for testing the bonding strength of the reinforced concrete, a push-out test is carried out by using the test device for testing the bonding strength of the reinforced concrete, and the test method specifically comprises the following steps:
the method comprises the following steps: a fixed structure base;
fixedly connecting the structural base with the test platform base through a lower connecting piece;
step two: placing a reinforced concrete sample;
enabling a long section of steel bar of the reinforced concrete sample to pass through the circular slot B of the top plate of the base and be placed on the top plate of the base;
step three: placing a pressure sensor;
respectively connecting a thread lower pressing plate and a thread upper pressing plate with the upper end and the lower end of an inner cavity of a pressure sensor in a thread matching mode to form a pressure detection mechanism, connecting the thread upper pressing plate in the pressure detection mechanism with a servo actuator fixedly supported above the pressure detection mechanism, and adjusting the servo actuator through a computer to enable the lower end surface of the thread lower pressing plate to be in contact with the upper end of a short section of steel bar of a reinforced concrete sample;
step four: placing an electronic dial indicator;
horizontally arranging the thin steel sheet A, and bonding one end of the thin steel sheet A with the side surface of the threaded lower pressing plate through structural adhesive; combining the electronic dial indicator with the universal support frame, and placing the universal support frame on the upper end surface of the top plate of the base to enable the lower end of a measuring rod of the electronic dial indicator to be in contact with the upper end surface of the thin steel sheet A;
step five: establishing a connection through a signal processor;
connecting the pressure sensor and the electronic dial indicator with a signal processor through a lead, and connecting the signal processor and the servo actuator with a computer through a lead;
step six: pushing out and loading;
the servo actuator is controlled by a computer to apply pressure downwards, the pressure is gradually increased, the pressure detection mechanism is driven to press the upper end of the short section of reinforcing steel bar downwards, and the pressure value collected by the pressure sensor and the reading of the electronic dial indicator are recorded in real time by the computer.
The method has simple steps and convenient operation, and can conveniently realize the push-out test of the reinforced concrete sample. The invention can effectively meet the test requirement on the bonding strength of the reinforced concrete, thereby accurately testing the bearing capacity of the reinforced concrete and providing a theoretical basis for engineering design and construction.
The invention also provides a test method for testing the bonding strength of the reinforced concrete, a test device for testing the bonding strength of the reinforced concrete is used for drawing test, and the test method specifically comprises the following steps:
the method comprises the following steps: a fixed structure base;
fixedly connecting the structural base with the test platform base through a lower connecting piece;
step two: placing a reinforced concrete sample;
arranging a short section of steel bar of the reinforced concrete sample towards a base top plate; placing the perforated lower pressing plate on the surface of the concrete sample after penetrating through the long-section steel bar of the reinforced concrete sample, and placing the pressure sensor on the perforated lower pressing plate after penetrating through the long-section steel bar of the reinforced concrete sample; placing the perforated upper pressing plate on the pressure sensor after penetrating through the long-section steel bar of the reinforced concrete sample;
step three: assembling a structural top plate and arranging a servo actuator;
penetrating the structural top plate through a long section of steel bar of the reinforced concrete sample, establishing the connection between the structural top plate and the structural base through the upper connecting piece, and keeping a certain distance between the structural top plate and the upper end face of the perforated upper pressing plate; a servo actuator is fixedly supported above the structural top plate and is fixedly connected with the upper end of the long section of steel bar, the servo actuator is controlled by a computer to retract for a certain distance, so that the perforated upper pressing plate is tightly attached to the structural top plate, and meanwhile, the end surface of the short section of steel bar (6-2) of the reinforced concrete sample is ensured to have a certain distance from the upper end surface of the base top plate;
step four: placing an electronic dial indicator;
horizontally arranging the thin steel sheet B, and bonding one end of the thin steel sheet B with the end face of the short section of the steel bar of the reinforced concrete sample through structural adhesive; combining the electronic dial indicator with the universal support frame, and placing the universal support frame on the upper end surface of the top plate of the base to enable the lower end of a measuring rod of the electronic dial indicator to be in contact with the upper end surface of the thin steel sheet A;
step five: establishing a connection through a signal processor;
connecting the pressure sensor and the electronic dial indicator with a signal processor through a lead, and connecting the signal processor and the servo actuator with a computer through a lead;
step six: drawing and loading are carried out;
the servo actuator is controlled by a computer to pull the long section of steel bar upwards, the tension is gradually increased, and the tension value collected by the pressure sensor and the reading of the electronic dial indicator are recorded in real time by the computer.
The method has simple steps and convenient operation, and can conveniently realize the push-out test of the reinforced concrete sample. The invention can effectively meet the test requirement on the bonding strength of the reinforced concrete, thereby accurately testing the bearing capacity of the reinforced concrete and providing a theoretical basis for engineering design and construction.
Drawings
FIG. 1 is a schematic view of the assembly of a structural base and a structural top plate of the present invention;
FIG. 2 is an exploded view of FIG. 1;
FIG. 3 is a schematic structural view of a structural top panel according to the present invention;
FIG. 4 is an exploded view of the structure of the structural base of the present invention;
FIG. 5 is a schematic view of a test apparatus according to the present invention;
FIG. 6 is an exploded view of FIG. 5 with the servo full actuator, signal processor and computer removed;
FIG. 7 is a schematic view of another test apparatus of the present invention;
FIG. 8 is an exploded view of FIG. 6 with the servo full actuator, signal processor and computer removed.
In the figure: 1. the device comprises a structural base, 2, a structural top plate, 3, an upper connecting piece, 4, a lower connecting piece, 5, a test platform base, 6, a reinforced concrete sample, 7, a thread lower pressing plate, 8, a thread upper pressing plate, 9, a pressure sensor, 10, thin steel sheets A, 11, a universal supporting frame, 12, an electronic dial indicator, 13, a signal processor, 14, a computer, 15, a table, 16, a perforation lower pressing plate, 17, a perforation upper pressing plate, 18, thin steel sheets B, 19 and a servo actuator;
1-1, a base top plate, 1-2, a base bottom plate, 1-3, a middle short rib plate, 1-4, a middle long rib plate, 1-5, an outer rib plate, 1-6, a vertical supporting piece, 2-1, a circular groove hole A, 2-2, a U-shaped groove hole a, 3-1, an upper connecting piece screw rod, 3-2, an upper connecting piece nut, 3-3, an upper connecting piece gasket, 4-1, a lower connecting piece bolt, 4-2, a lower connecting piece nut, 4-3, an upper connecting piece gasket, 6-1, a long section of steel bar, 6-2 and a short section of steel bar;
1-1-1, circular slotted holes B, 1-1-2, U-shaped slotted holes B, 1-2-1 and circular slotted holes C.
Detailed Description
The present invention will be further described with reference to fig. 1 to 8.
The invention provides a test device for testing the bonding strength of reinforced concrete, which comprises a structure base 1, an upper connecting piece 3 and a lower connecting piece 4;
the structure base 1 extends vertically and comprises vertical supporting pieces 1-6, a base top plate 1-1 fixedly connected to the tops of the vertical supporting pieces 1-6 and a base bottom plate 1-2 fixedly connected to the bottoms of the vertical supporting pieces 1-6; the vertical support part 1-6 comprises two middle long rib plates 1-4 which are oppositely arranged, two middle short rib plates 1-3 which are oppositely arranged and two pairs of outer rib plates 1-5 which are respectively positioned at the outer sides of the two middle long rib plates 1-4, the two middle short rib plates 1-3 are fixedly connected between the two middle long rib plates 1-4, and the two pairs of outer rib plates 1-5 are respectively fixedly connected at the outer sides of the two middle long rib plates 1-4; the center of the base top plate 1-1 is provided with a circular slotted hole B1-1-1, and part of the edge of the base top plate is circumferentially and uniformly provided with a plurality of U-shaped slotted holes B1-1-2; a plurality of circular slotted holes C1-2-1 are uniformly formed in the circumferential direction of the part, close to the edge, of the base bottom plate 1-2;
the number of the lower connecting pieces 4 is a plurality, and the number is consistent with that of the circular slot holes C1-2-1; the upper end of the lower connecting piece 4 is inserted into the circular slotted hole C1-2-1;
the number of the upper connecting pieces 3 is a plurality, the number of the upper connecting pieces is consistent with that of the U-shaped slotted holes b1-1-2, and the lower ends of the upper connecting pieces 3 are inserted into the U-shaped slotted holes b 1-1-2.
The device has simple structure and low manufacturing cost, and can effectively meet the test requirement on the bonding strength of the reinforced concrete, thereby being beneficial to accurately testing the bearing capacity of the reinforced concrete.
In order to ensure the stability of the testing device, the testing device further comprises a testing platform base 5, wherein the testing platform base 5 is arranged below the structure base 1, a plurality of circular through holes are formed in the testing platform base 5 and correspond to the circular slotted holes C1-2-1 one by one, and the lower ends of the lower connecting pieces 4 are respectively inserted into the circular through holes and fixedly connect the testing platform base 5 with the base bottom plate 1-2.
In order to synchronously record data in real time during the push-out test, the device also comprises a reinforced concrete sample 6, a pressure sensor 9, a thread upper pressing plate 8, a thread lower pressing plate 7, a servo actuator 19, a thin steel sheet A10, a universal support frame 11, an electronic dial indicator 12, a signal processor 13 and a computer 14;
the part of the vertical support piece 1-6 corresponding to the circular slotted hole B1-1-1 is of a hollow structure;
the reinforced concrete sample 6 is a reinforced concrete sample to be tested and is in a cubic shape, reinforcing steel bars are embedded in the middle of the reinforced concrete sample, the reinforcing steel bars extend to the outer parts of two opposite end faces of the reinforced concrete sample 6, short-section reinforcing steel bars 6-2 are exposed out of one side of the reinforced concrete sample 6, and long-section reinforcing steel bars 6-1 are exposed out of the other side of the reinforced concrete sample 6; the reinforced concrete sample 6 is arranged above the top plate 1-1 of the base, and the long section of steel bar 6-1 passes through the circular slotted hole B1-1-1 and extends into the cavity of the vertical support 1-6;
the pressure sensor 9 is a hollow force measuring sensor, and the upper end and the lower end of an inner cavity of the pressure sensor 9 are both provided with an internal thread structure; the lower end of the thread upper pressure plate 8 and the upper end of the thread lower pressure plate 7 are both fixedly connected with studs and are connected with the upper end and the lower end of a pressure sensor 9 through the studs to form a pressure detection mechanism; the pressure detection mechanism is arranged above the reinforced concrete sample 6, and the lower end face of the thread lower pressing plate 7 is in contact with the upper end of the short section of the steel bar 6-2;
the servo actuator 19 is fixedly supported above the pressure detection mechanism, the telescopic end of the servo actuator is downward arranged, and the servo actuator is fixedly connected with the upper end face of the threaded upper pressure plate 8;
the thin steel sheet A10 is horizontally arranged, one end of the thin steel sheet A10 is adhered to the side surface of the thread lower pressing plate 7 in a fitting manner, and the other end of the thin steel sheet A10 extends to the outer side of the reinforced concrete sample 6;
the base of the universal support frame 11 is fixedly connected to the upper end face of the base top plate 1-1, the electronic dial indicator 12 is installed on the upper portion of the universal support frame 11, and the lower end of a measuring rod of the electronic dial indicator is in contact fit with the upper end face of the thin steel sheet A10;
the computer 14 is connected with the electronic dial indicator 12 and the pressure sensor 9 through the signal processor 13 respectively, and is also connected with the servo actuator 19. Preferably, the computer 14 is disposed on a desk 15.
The invention has simple structure and low manufacturing cost, can conveniently carry out the push-out test of the reinforced concrete sample, can conveniently record test data, can accurately test the bearing capacity of the reinforced concrete and can provide theoretical basis for engineering design and construction.
In order to facilitate the drawing test, the drawing test device further comprises a structural top plate 2, the structural top plate 2 is arranged above the structural base 1, the center of the structural top plate is provided with a circular slotted hole A2-1, the part of the edge of the structural top plate is circumferentially and uniformly provided with a plurality of U-shaped slotted holes a2-2, the circular slotted hole A2-1 is arranged corresponding to the circular slotted hole B1-1-1, and the plurality of U-shaped slotted holes a2-2 is arranged corresponding to the plurality of U-shaped slotted holes B1-1-2.
In order to synchronously record data in real time during the drawing test, the device also comprises a reinforced concrete sample 6, a pressure sensor 9, a perforated lower pressing plate 16, a perforated upper pressing plate 17, a servo actuator 19, a thin steel sheet B18, a universal support frame 11, an electronic dial indicator 12, a signal processor 13 and a computer 14;
the part of the vertical support piece 1-6 corresponding to the circular slotted hole B1-1-1 is of a hollow structure;
the reinforced concrete sample 6 is a reinforced concrete sample to be tested and is in a cubic shape, reinforcing steel bars are embedded in the middle of the reinforced concrete sample, the reinforcing steel bars extend to the outer parts of two opposite end faces of the reinforced concrete sample 6, short-section reinforcing steel bars 6-2 are exposed out of one side of the reinforced concrete sample 6, and long-section reinforcing steel bars 6-1 are exposed out of the other side of the reinforced concrete sample 6; the reinforced concrete sample 6 is arranged between the base top plate 1-1 and the structural top plate 2, a gap is reserved between the lower end of the short section of the steel bar 6-2 and the upper end face of the base top plate 1-1, and the upper end of the long section of the steel bar 6-1 penetrates out of the upper part of the structural top plate 2 through the circular slotted hole A2-1;
the pressure sensor 9 is a hollow force measuring sensor; through holes are formed in the centers of the perforated upper pressing plate 17 and the perforated lower pressing plate 16 and are coaxially arranged at the upper end and the lower end of the pressure sensor 9 respectively to form a pressure detection mechanism with a hollow cavity; the pressure detection mechanism is arranged between the reinforced concrete sample 6 and the structural top plate 2 and is sleeved outside the long-section steel bar 6-1 through a cavity in the pressure detection mechanism;
the servo actuator 19 is fixedly supported above the structural top plate 2, and the telescopic end of the servo actuator is arranged downwards and is fixedly connected with the upper end of the long section of steel bar 6-1;
the thin steel sheet B18 is horizontally arranged, one end of the thin steel sheet B18 is attached to the end face of the short section of the steel bar 6-2 of the reinforced concrete sample 6, and the other end of the thin steel sheet B18 horizontally extends to the outer side of the reinforced concrete sample 6;
the base of the universal support frame 11 is fixedly connected to the upper end face of the base top plate 1-1, the electronic dial indicator 12 is installed on the upper portion of the universal support frame 11, and the lower end of a measuring rod of the electronic dial indicator is in contact fit with the upper end face of the thin steel sheet B18;
the computer 14 is connected with the electronic dial indicator 12 and the pressure sensor 9 through the signal processor 13 respectively, and is also connected with the servo actuator 19. Preferably, the computer 14 is disposed on a desk 15.
The invention has simple structure and low manufacturing cost, can conveniently carry out the drawing test of the reinforced concrete sample, can conveniently record test data, can accurately test the bearing capacity of the reinforced concrete and can provide theoretical basis for engineering design and construction.
In order to facilitate the assembly of the test device and the disassembly of the test device, the upper connecting piece 3 consists of an upper connecting piece screw 3-1, a plurality of upper connecting piece nuts 3-2 respectively connected to the upper end and the lower end of the upper connecting piece screw 3-1 and a plurality of upper connecting piece gaskets 3-3 respectively sleeved on the upper end and the lower end of the upper connecting piece screw 3-1;
the lower connecting piece 4 consists of a lower connecting piece bolt 4-1, a plurality of lower connecting piece nuts 4-2 connected to the lower part of the lower connecting piece bolt 4-1 and a plurality of lower connecting piece gaskets 4-3 respectively sleeved on the lower part of the lower connecting piece bolt 4-1.
Preferably, the base top plate 1-1 and the base bottom plate 1-2 are both square, and the number of the U-shaped slotted holes b1-1-2 is four, and the U-shaped slotted holes b1-1-2 are respectively arranged in the middle of four sides of the base top plate 1-1.
The invention also provides a test method for testing the bonding strength of the reinforced concrete, a push-out test is carried out by using the test device for testing the bonding strength of the reinforced concrete, and the test method specifically comprises the following steps:
the method comprises the following steps: a fixed structure base 1;
fixedly connecting the structure base 1 with a test platform base 5 through a lower connecting piece 4;
step two: placing a reinforced concrete sample 6;
enabling a long section of steel bar 6-1 of the reinforced concrete sample 6 to penetrate through a circular slotted hole B1-1-1 of the base top plate 1-1 and placing the long section of steel bar on the base top plate 1-1;
step three: placing a pressure sensor 9;
the thread lower pressing plate 7 and the thread upper pressing plate 8 are respectively connected with the upper end and the lower end of an inner cavity of a pressure sensor 9 in a thread matching mode to form a pressure detection mechanism, the thread upper pressing plate 8 in the pressure detection mechanism is connected with a servo actuator 19 fixedly supported above the pressure detection mechanism, and the servo actuator 19 is adjusted by a computer 14 to enable the lower end face of the thread lower pressing plate 7 to be in contact with the upper end of the short section of steel bar 6-2 of the reinforced concrete sample 6;
step four: placing the electronic dial indicator 12;
horizontally arranging a thin steel sheet A10, and bonding one end of the thin steel sheet A10 with the side surface of the thread lower pressing plate 7 through structural adhesive; combining the electronic dial indicator 12 with the universal support frame 11, and placing the universal support frame 11 on the upper end surface of the base top plate 1-1 to enable the lower end of a measuring rod of the electronic dial indicator 12 to be in contact with the upper end surface of the thin steel sheet A10;
step five: establishing a connection through the signal processor 13;
the pressure sensor 9 and the electronic dial indicator 12 are connected with the signal processor 12 through leads, and the signal processor 12 and the servo actuator 19 are connected with the computer 14 through leads;
step six: pushing out and loading;
the servo actuator 19 is controlled by the computer 14 to apply pressure downwards, the pressure is gradually increased, the pressure detection mechanism is driven to press the upper end of the short section of the steel bar 6-2 downwards, and the pressure value collected by the pressure sensor 9 and the reading of the electronic dial indicator 12 are recorded in real time by the computer 14.
The method has simple steps and convenient operation, and can conveniently realize the push-out test of the reinforced concrete sample. The invention can effectively meet the test requirement on the bonding strength of the reinforced concrete, thereby accurately testing the bearing capacity of the reinforced concrete and providing a theoretical basis for engineering design and construction.
The invention also provides a test method for testing the bonding strength of the reinforced concrete, a test device for testing the bonding strength of the reinforced concrete is used for drawing test, and the test method specifically comprises the following steps:
the method comprises the following steps: a fixed structure base 1;
fixedly connecting the structure base 1 with a test platform base 5 through a lower connecting piece 4;
step two: placing a reinforced concrete sample 6;
arranging a short section of steel bar 6-2 of the reinforced concrete sample 6 towards a base top plate 1-1; placing a perforated lower pressing plate 16 on the surface of the concrete sample 6 after penetrating through the long-section steel bar 6-1 of the reinforced concrete sample 6, and placing a pressure sensor 9 on the perforated lower pressing plate 16 after penetrating through the long-section steel bar 6-1 of the reinforced concrete sample 6; the perforated upper pressing plate 17 penetrates through the long section of steel bar 6-1 of the reinforced concrete sample 6 and is placed on the pressure sensor 9;
step three: assembling the structural top plate 2, arranging the servo actuator 19;
penetrating a structural top plate 2 through a long section of steel bar 6-1 of a reinforced concrete sample 6, establishing connection between the structural top plate 2 and a structural base 1 through an upper connecting piece 3, and keeping a certain distance between the structural top plate 2 and the upper end face of a perforated upper pressure plate 17; fixedly supporting a servo actuator 19 above the structural top plate 2, fixedly connecting the servo actuator 19 with the upper end of the long section of the steel bar 6-1, controlling the servo actuator 19 to retract for a certain distance through a computer 14, enabling a perforated upper pressing plate 17 to be tightly attached to the structural top plate 2, and simultaneously ensuring that the end surface of the short section of the steel bar 6-2 of the reinforced concrete sample 6 has a certain distance from the upper end surface of the base top plate 1-1;
step four: placing the electronic dial indicator 12;
horizontally arranging a thin steel sheet B18, and bonding one end of the thin steel sheet B18 with the end face of a short section of steel bar 6-2 of the reinforced concrete sample 6 through structural adhesive; combining the electronic dial indicator 12 with the universal support frame 11, and placing the universal support frame 11 on the upper end surface of the base top plate 1-1 to enable the lower end of a measuring rod of the electronic dial indicator 12 to be in contact with the upper end surface of the thin steel sheet A10;
step five: establishing a connection through the signal processor 13;
the pressure sensor 9 and the electronic dial indicator 12 are connected with the signal processor 12 through leads, and the signal processor 12 and the servo actuator 19 are connected with the computer 14 through leads;
step six: drawing and loading are carried out;
the servo actuator 19 is controlled by the computer 14 to pull the long section of the steel bar 6-1 upwards, the tension is gradually increased, and the tension value collected by the pressure sensor 9 and the reading of the electronic dial indicator 12 are recorded in real time by the computer 14.
The method has simple steps and convenient operation, and can conveniently realize the push-out test of the reinforced concrete sample. The invention can effectively meet the test requirement on the bonding strength of the reinforced concrete, thereby accurately testing the bearing capacity of the reinforced concrete and providing a theoretical basis for engineering design and construction.
Claims (9)
1. A test device for testing the bonding strength of reinforced concrete comprises a structural base (1), and is characterized by further comprising an upper connecting piece (3) and a lower connecting piece (4);
the structure base (1) extends vertically and comprises vertical supporting pieces (1-6), a base top plate (1-1) fixedly connected to the tops of the vertical supporting pieces (1-6) and a base bottom plate (1-2) fixedly connected to the bottoms of the vertical supporting pieces (1-6); the vertical support piece (1-6) comprises two middle long rib plates (1-4) which are oppositely arranged, two middle short rib plates (1-3) which are oppositely arranged and two pairs of outer side rib plates (1-5) which are respectively positioned at the outer sides of the two middle long rib plates (1-4), the two middle short rib plates (1-3) are fixedly connected between the two middle long rib plates (1-4), and the two pairs of outer side rib plates (1-5) are respectively fixedly connected at the outer sides of the two middle long rib plates (1-4); the center of the base top plate (1-1) is provided with a circular slotted hole B (1-1-1), and part of the edge of the base top plate is circumferentially and uniformly provided with a plurality of U-shaped slotted holes B (1-1-2); a plurality of circular slotted holes C (1-2-1) are uniformly formed in the circumferential direction of the part, close to the edge, of the base bottom plate (1-2);
the number of the lower connecting pieces (4) is multiple and is consistent with that of the circular slotted holes C (1-2-1); the upper end of the lower connecting piece (4) is inserted into the circular slotted hole C (1-2-1);
the number of the upper connecting pieces (3) is multiple and is consistent with that of the U-shaped slotted holes b (1-1-2), and the lower ends of the upper connecting pieces (3) are inserted into the U-shaped slotted holes b (1-1-2).
2. The test device for testing the bonding strength of the reinforced concrete according to claim 1, further comprising a test platform base (5), wherein the test platform base (5) is arranged below the structural base (1), a plurality of circular through holes are formed in the test platform base (5), the circular through holes and the circular slotted holes C (1-2-1) are correspondingly arranged one by one, and the lower ends of the lower connecting pieces (4) are respectively inserted into the circular through holes and fixedly connect the test platform base (5) and the base bottom plate (1-2).
3. The test device for testing the bonding strength of the reinforced concrete according to claim 2, characterized by further comprising a reinforced concrete sample (6), a pressure sensor (9), a thread upper pressing plate (8), a thread lower pressing plate (7), a servo actuator (19), a thin steel sheet A (10), a universal support frame (11), an electronic dial indicator (12), a signal processor (13) and a computer (14);
the part of the vertical supporting piece (1-6) corresponding to the circular slotted hole B (1-1-1) is of a hollow structure;
the reinforced concrete sample (6) is a reinforced concrete sample to be tested and is in a cubic shape, reinforcing steel bars are embedded in the middle of the reinforced concrete sample, the reinforcing steel bars extend to the outer parts of two opposite end faces of the reinforced concrete sample (6), short-section reinforcing steel bars (6-2) are exposed out of one side of the reinforced concrete sample (6), and long-section reinforcing steel bars (6-1) are exposed out of the other side of the reinforced concrete sample (6); the reinforced concrete sample (6) is arranged above the base top plate (1-1), and the long section of steel bar (6-1) passes through the circular slotted hole B (1-1-1) and extends into the cavity of the vertical supporting piece (1-6);
the pressure sensor (9) is a hollow force measuring sensor, and the upper end and the lower end of an inner cavity of the pressure sensor (9) are both provided with an internal thread structure; the lower end of the thread upper pressure plate (8) and the upper end of the thread lower pressure plate (7) are fixedly connected with studs and are connected to the upper end and the lower end of a pressure sensor (9) through the studs to form a pressure detection mechanism; the pressure detection mechanism is arranged above the reinforced concrete sample (6), and the lower end face of the thread lower pressing plate (7) is in contact with the upper end of the short section of steel bar (6-2);
the servo actuator (19) is fixedly supported above the pressure detection mechanism, and the telescopic end of the servo actuator is downward arranged and fixedly connected with the upper end face of the threaded upper pressure plate (8);
the thin steel sheet A (10) is horizontally arranged, one end of the thin steel sheet A is attached to the side surface of the threaded lower pressing plate (7), and the other end of the thin steel sheet A extends to the outer side of the reinforced concrete sample (6);
the base of the universal support frame (11) is fixedly connected to the upper end face of the base top plate (1-1), the electronic dial indicator (12) is installed on the upper portion of the universal support frame (11), and the lower end of a measuring rod of the electronic dial indicator is in contact fit with the upper end face of the thin steel sheet A (10);
and the computer (14) is respectively connected with the electronic dial indicator (12) and the pressure sensor (9) through a signal processor (13), and is also connected with the servo actuator (19).
4. The test device for testing the bonding strength of the reinforced concrete according to claim 2, further comprising a structural top plate (2), wherein the structural top plate (2) is arranged above the structural base (1), the center of the structural top plate is provided with a circular slotted hole A (2-1), part of the edge of the structural top plate is circumferentially and uniformly provided with a plurality of U-shaped slotted holes a (2-2), the circular slotted hole A (2-1) is arranged corresponding to the circular slotted hole B (1-1-1), and the plurality of U-shaped slotted holes a (2-2) is arranged corresponding to the plurality of U-shaped slotted holes B (1-1-2).
5. The test device for testing the bonding strength of the reinforced concrete according to claim 4, characterized by further comprising a reinforced concrete sample (6), a pressure sensor (9), a perforated lower pressing plate (16), a perforated upper pressing plate (17), a servo actuator (19), a thin steel sheet B (18), a universal support frame (11), an electronic dial indicator (12), a signal processor (13) and a computer (14);
the part of the vertical supporting piece (1-6) corresponding to the circular slotted hole B (1-1-1) is of a hollow structure;
the reinforced concrete sample (6) is a reinforced concrete sample to be tested and is in a cubic shape, reinforcing steel bars are embedded in the middle of the reinforced concrete sample, the reinforcing steel bars extend to the outer parts of two opposite end faces of the reinforced concrete sample (6), short-section reinforcing steel bars (6-2) are exposed out of one side of the reinforced concrete sample (6), and long-section reinforcing steel bars (6-1) are exposed out of the other side of the reinforced concrete sample (6); the reinforced concrete sample (6) is arranged between the base top plate (1-1) and the structural top plate (2), a gap is reserved between the lower end of the short section of the steel bar (6-2) and the upper end face of the base top plate (1-1), and the upper end of the long section of the steel bar (6-1) penetrates out of the upper part of the structural top plate (2) through the circular slotted hole A (2-1);
the pressure sensor (9) is a hollow force measuring sensor; through holes are formed in the centers of the perforated upper pressing plate (17) and the perforated lower pressing plate (16) and are coaxially arranged at the upper end and the lower end of the pressure sensor (9) respectively to form a pressure detection mechanism with a hollow cavity; the pressure detection mechanism is arranged between the reinforced concrete sample (6) and the structural top plate (2), and is sleeved outside the long-section steel bar (6-1) through a cavity in the pressure detection mechanism;
the servo actuator (19) is fixedly supported above the structural top plate (2), and the telescopic end of the servo actuator is arranged downwards and is fixedly connected with the upper end of the long section of steel bar (6-1);
the thin steel sheet B (18) is horizontally arranged, one end of the thin steel sheet B is attached to the end face of a short section of steel bar (6-2) of the reinforced concrete sample (6), and the other end of the thin steel sheet B horizontally extends to the outer side of the reinforced concrete sample (6);
the base of the universal support frame (11) is fixedly connected to the upper end face of the base top plate (1-1), the electronic dial indicator (12) is installed on the upper portion of the universal support frame (11), and the lower end of a measuring rod of the electronic dial indicator is in contact fit with the upper end face of the thin steel sheet B (18);
and the computer (14) is respectively connected with the electronic dial indicator (12) and the pressure sensor (9) through a signal processor (13), and is also connected with the servo actuator (19).
6. The test device for testing the bonding strength of the reinforced concrete according to claim 3 or 5, wherein the upper connecting piece (3) consists of an upper connecting piece screw rod (3-1), a plurality of upper connecting piece nuts (3-2) respectively connected to the upper and lower ends of the upper connecting piece screw rod (3-1) and a plurality of upper connecting piece gaskets (3-3) respectively sleeved on the upper and lower ends of the upper connecting piece screw rod (3-1);
the lower connecting piece (4) consists of a lower connecting piece bolt (4-1), a plurality of lower connecting piece nuts (4-2) connected to the lower part of the lower connecting piece bolt (4-1) and a plurality of lower connecting piece gaskets (4-3) respectively sleeved on the lower part of the lower connecting piece bolt (4-1).
7. The testing device for testing the bonding strength of the reinforced concrete according to claim 3 or 5, wherein the base top plate (1-1) and the base bottom plate (1-2) are square, the number of the U-shaped slotted holes b (1-1-2) is four, and the U-shaped slotted holes b are respectively arranged in the middle of four sides of the base top plate (1-1).
8. A test method for testing the bonding strength of reinforced concrete, which is characterized in that the test device for testing the bonding strength of reinforced concrete according to claim 3 is used for carrying out a push-out test, and comprises the following steps:
the method comprises the following steps: a fixed structure base (1);
fixedly connecting the structure base (1) with a test platform base (5) through a lower connecting piece (4);
step two: placing a reinforced concrete sample (6);
enabling a long section of steel bar (6-1) of the reinforced concrete sample (6) to penetrate through a circular slotted hole B (1-1-1) of a base top plate (1-1) and place the long section of steel bar on the base top plate (1-1);
step three: placing a pressure sensor (9);
the lower threaded pressing plate (7) and the upper threaded pressing plate (8) are respectively connected with the upper end and the lower end of an inner cavity of a pressure sensor (9) in a threaded matching mode to form a pressure detection mechanism, the upper threaded pressing plate (8) in the pressure detection mechanism is connected with a servo actuator (19) fixedly supported above the pressure detection mechanism, and the servo actuator (19) is adjusted by a computer (14) to enable the lower end surface of the lower threaded pressing plate (7) to be in contact with the upper end of a short section of steel bar (6-2) of a reinforced concrete sample (6);
step four: placing an electronic dial indicator (12);
horizontally arranging a thin steel sheet A (10), and bonding one end of the thin steel sheet A with the side surface of the thread lower pressing plate (7) through structural adhesive; combining an electronic dial indicator (12) with a universal support frame (11), and placing the universal support frame (11) on the upper end surface of a base top plate (1-1) to enable the lower end of a measuring rod of the electronic dial indicator (12) to be in contact with the upper end surface of a thin steel sheet A (10);
step five: establishing a connection by means of a signal processor (13);
the pressure sensor (9) and the electronic dial indicator (12) are connected with the signal processor (12) through leads, and the signal processor (12) and the servo actuator (19) are connected with the computer (14) through leads;
step six: pushing out and loading;
the servo actuator (19) is controlled by the computer (14) to apply pressure downwards, the pressure is gradually increased, the pressure detection mechanism is driven to press the upper end of the short section of the steel bar (6-2) downwards, and the pressure value collected by the pressure sensor (9) and the reading of the electronic dial indicator (12) are recorded in real time by the computer (14).
9. A test method for testing the bonding strength of reinforced concrete, which is characterized in that a drawing test is carried out by using the test device for testing the bonding strength of reinforced concrete according to claim 5, and the method comprises the following steps:
the method comprises the following steps: a fixed structure base (1);
fixedly connecting the structure base (1) with a test platform base (5) through a lower connecting piece (4);
step two: placing a reinforced concrete sample (6);
arranging a short section of steel bar (6-2) of the reinforced concrete sample (6) towards a base top plate (1-1); placing a perforated lower pressing plate (16) on the surface of the concrete sample (6) after penetrating through the long-section steel bar (6-1) of the reinforced concrete sample (6), and placing a pressure sensor (9) on the perforated lower pressing plate (16) after penetrating through the long-section steel bar (6-1) of the reinforced concrete sample (6); placing a perforated upper pressure plate (17) on a pressure sensor (9) after penetrating through a long section of steel bar (6-1) of a reinforced concrete sample (6);
step three: an assembly structure top plate (2), an arrangement servo actuator (19);
penetrating a structural top plate (2) through a long section of steel bar (6-1) of a reinforced concrete sample (6), establishing connection between the structural top plate (2) and a structural base (1) through an upper connecting piece (3), and keeping a certain distance between the structural top plate (2) and the upper end face of a perforated upper pressing plate (17); a servo actuator (19) is fixedly supported above the structural top plate (2), the servo actuator (19) is fixedly connected with the upper end of the long section of steel bar (6-1), the servo actuator (19) is controlled to retract for a certain distance through a computer (14), the perforated upper pressing plate (17) is tightly attached to the structural top plate (2), and meanwhile, the end surface of the short section of steel bar (6-2) of the reinforced concrete sample (6) is ensured to have a certain distance from the upper end surface of the base top plate (1-1);
step four: placing an electronic dial indicator (12);
horizontally arranging the thin steel sheet B (18), and bonding one end of the thin steel sheet B with the end face of the short section of steel bar (6-2) of the reinforced concrete sample (6) through structural adhesive; combining an electronic dial indicator (12) with a universal support frame (11), and placing the universal support frame (11) on the upper end surface of a base top plate (1-1) to enable the lower end of a measuring rod of the electronic dial indicator (12) to be in contact with the upper end surface of a thin steel sheet A (10);
step five: establishing a connection by means of a signal processor (13);
the pressure sensor (9) and the electronic dial indicator (12) are connected with the signal processor (12) through leads, and the signal processor (12) and the servo actuator (19) are connected with the computer (14) through leads;
step six: drawing and loading are carried out;
the servo actuator (19) is controlled by the computer (14) to pull the long section of steel bar (6-1) upwards, the tension is gradually increased, and the tension value collected by the pressure sensor (9) and the reading of the electronic dial indicator (12) are recorded in real time by the computer (14).
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| CN202010761869.3A CN111948131B (en) | 2020-07-31 | 2020-07-31 | Test device and test method for testing bonding strength of reinforced concrete |
| AU2020101793A AU2020101793A4 (en) | 2020-07-31 | 2020-08-13 | Test device for testing bond strength of reinforced concrete |
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| CN202010761869.3A CN111948131B (en) | 2020-07-31 | 2020-07-31 | Test device and test method for testing bonding strength of reinforced concrete |
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| CN113092213B (en) * | 2021-04-25 | 2023-06-30 | 西藏农牧学院 | Triaxial sample batch manufacturing device and method capable of performing dry-wet circulation |
| CN114018806A (en) * | 2021-10-14 | 2022-02-08 | 中山大学 | BFRP (bidirectional Forwarding resistance) bar and concrete dynamic bonding performance test system and test method |
| CN114062256A (en) * | 2021-11-29 | 2022-02-18 | 兰州交通大学 | Loading device and method for testing bonding performance of steel bar and concrete |
| CN114527067B (en) * | 2022-02-24 | 2023-11-10 | 山东省建筑工程质量检验检测中心有限公司 | Steel and concrete positive drawknot strength detection tool |
| CN114354361B (en) * | 2022-03-16 | 2022-05-20 | 潍坊昌大建设集团有限公司 | Steel bar connection strength detection device |
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