AU2020101793A4 - Test device for testing bond strength of reinforced concrete - Google Patents
Test device for testing bond strength of reinforced concrete Download PDFInfo
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- AU2020101793A4 AU2020101793A4 AU2020101793A AU2020101793A AU2020101793A4 AU 2020101793 A4 AU2020101793 A4 AU 2020101793A4 AU 2020101793 A AU2020101793 A AU 2020101793A AU 2020101793 A AU2020101793 A AU 2020101793A AU 2020101793 A4 AU2020101793 A4 AU 2020101793A4
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
A test device for testing bond strength of reinforced concrete, wherein a structural base extends
vertically, and includes a vertical support, and a base top panel and a base bottom panel that are
respectively fixedly connected to a top portion and a bottom portion of the vertical support; the
vertical support includes two middle long ribs that are oppositely arranged, two middle short ribs
that are oppositely arranged and two pairs of outer ribs that are respectively located outside the two
middle long ribs; a center of the base top panel is provided with a circular slot B, and a part of an
edge of the base top panel is provided with a plurality of U-shaped slots b uniformly in a
circumferential direction; a portion of the base bottom panel close to an edge is provided with a
plurality of circular slots C uniformly in a circumferential direction; a lower portion connecting
member has a plurality of members, of which the number is consistent with the number of the
circular slots C; an upper end of the lower portion connecting member is inserted into the circular
slots C; an upper portion connecting member has a plurality of members, of which the number is
consistent with the number of the U-shaped slots b, and a lower end of the upper portion connecting
member is inserted into the U-shaped slots b. The device can effectively meet the test requirements
for the bond strength of reinforced concrete.
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Description
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Fig. 6
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) Technical Field
The present invention belongs to the technical field of construction engineering, in particular,
to a test device for testing bond strength of reinforced concrete.
Background of the Application
In the process of design, construction and use of reinforced concrete structure, due to various
uncertain factors, the load-bearing capacity cannot meet the requirements of safe use. However, in
a reinforced concrete structure, the mutual bonding between reinforcement bars and the concrete
is the key to their mutual action, i.e., the bonding between reinforcement bars and the concrete
allows the two materials to give full play to their respective advantages, thereby establishing the
load-bearing capacity of the reinforced concrete structure. In the prior art, the test device has
cumbersome structure and complicated operation, and cannot effectively meet the test
requirements for the bond strength of reinforced concrete, so that the test device cannot accurately
test the load-bearing capacity of reinforced concrete, and cannot provide a theoretical basis for
engineering design and construction.
Summary of the Invention:
In view of some problems in the prior art, the present invention provides a test device for
testing bond strength of reinforced concrete, which has a simple structure, and may effectively
meet the test requirements for the bond strength of reinforced concrete, thereby helping to
accurately test the load-bearing capacity of reinforced concrete.
To achieve above purpose, the present invention provides a test device for testing bond strength of reinforced concrete, which includes a structural base, an upper portion connecting member and a lower portion connecting member;
the structural base extends vertically, and comprises a vertical support, a base top panel fixedly connected to a top portion of the vertical support, and a base bottom panel fixedly connected to a bottom portion of the vertical support; the vertical support comprises two middle long ribs that are oppositely arranged, two middle short ribs that are oppositely arranged and two pairs of outer ribs that are respectively located outside the two middle long ribs, the two middle short ribs are fixedly connected between the two middle long ribs, and the two pairs of outer ribs are fixedly connected outside the two middle long ribs respectively; a center of the base top panel is provided with a circular slot B, and a part of an edge of the base top panel is provided with a plurality of U-shaped slots b uniformly in a circumferential direction; a portion of the base bottom panel close to an edge is provided with a plurality of circular slots C uniformly in a circumferential direction; the lower portion connecting member has a plurality of members, of which the number is consistent with the number of the circular slots C; an upper end of the lower portion connecting member is inserted into the circular slots C; the upper portion connecting member has a plurality of members, of which the number is consistent with the number of the U-shaped slots b, and a lower end of the upper portion connecting member is inserted into the U-shaped slots b.
The device has a simple structure, a low manufacturing cost and may effectively meet the test requirements for the bond strength of reinforced concrete, thereby helping to accurately test the load-bearing capacity of reinforced concrete.
Further, in order to ensure the stability of the test device, the device further includes a test platform base, and the test platform base is arranged below the structural base; the test platform base is provided with a plurality of circular through holes, the plurality of circular through holes and the plurality of circular slots C are arranged correspondingly one by one, and lower ends of a plurality of lower portion connecting members are inserted into the plurality of circular through holes respectively and fixedly connect the test platform base with the base bottom panel.
Further, in order to record the data synchronously in real time during the push-out test, the device further includes a reinforced concrete specimen, a pressure sensor, a threaded upper pressure panel, a threaded lower pressure panel, a servo actuator, a thin steel sheet A, a universal support frame, an electronic dial indicator, a signal processor and a computer;
a part of the vertical support corresponding to the circular slot B has a hollow structure;
the reinforced concrete specimen is a reinforced concrete sample to be tested, which is cube-shaped with reinforcement bars embedded in the middle, and the reinforcement bars extend to the outside of opposite end surfaces of the reinforced concrete specimen; short reinforcement bars are exposed on one side of the reinforced concrete specimen, and long reinforcement bars are exposed on the other side of the reinforced concrete specimen; the reinforced concrete specimen is arranged above the base top panel, and the long reinforcement bars extend through the circular slots B into a cavity of the vertical support; the pressure sensor is a hollow load cell, and both upper and lower ends of an inner cavity of the pressure sensor are provided with an internal thread structure; a lower end of the threaded upper pressure panel and an upper end of the threaded lower pressure panel are fixedly connected with studs, and a pressure detection mechanism is formed by connecting the studs with upper and lower ends of the pressure sensor; the pressure detection mechanism is arranged above the reinforced concrete specimen, and a lower end surface of the threaded lower pressure panel is arranged in contact with an upper end of the short reinforcement bar; the servo actuator is supported above the pressure detection mechanism, with a telescopic end arranged downward and fixedly connected to an upper end surface of the threaded upper pressure panel; the thin steel sheet A is arranged horizontally, with one end adhered snugly to a side of the threaded lower pressure panel and the other end extending to the outside of the reinforced concrete specimen; a base of the universal support frame is fixedly connected to an upper end surface of the base top panel, and the electronic dial indicator is mounted at an upper portion of the universal support frame and has a lower end of a measuring rod cooperating in contact with an upper end surface of the thin steel sheet A; the computer is respectively connected to the electronic dial indicator and the pressure sensor through the signal processor, and is further connected to the servo actuator.
The present invention has a simple structure, a low manufacturing cost, may conveniently carry out the push-out test of the reinforced concrete specimen, may also conveniently record the test data, may accurately test the load-bearing capacity of reinforced concrete, and may provide a theoretical basis for engineering design and construction.
Further, in order to facilitate the drawing test, the device further comprises a structural top panel; the structural top panel is arranged above the structural base, and has a center provided with a circular slot A and a part of an edge provided with a plurality of U-shaped slots a uniformly in a circumferential direction, the circular slots A and the circular slots B being arranged correspondingly, the plurality of U-shaped slots a and the plurality of U-shaped slots b being arranged correspondingly.
Further, in order to record the data synchronously in real time during the drawing test, the device further includes a reinforced concrete specimen, a pressure sensor, a perforated lower pressure panel, a perforated upper pressure panel, a servo actuator, a thin steel sheet B, a universal support frame, an electronic dial indicator, a signal processor and a computer; a part of the vertical support corresponding to the circular slot B has a hollow structure; the reinforced concrete specimen is a reinforced concrete sample to be tested, which is cube-shaped with reinforcement bars embedded in the middle, and the reinforcement bars extend to the outside of opposite end surfaces of the reinforced concrete specimen; short reinforcement bars are exposed on one side of the reinforced concrete specimen, and long reinforcement bars are exposed on the other side of the reinforced concrete specimen; the reinforced concrete specimen is arranged between the base top panel and the structural top panel, and a gap is left between a lower end of the short reinforcement bar and the upper end surface of the base top panel, an upper end of the long reinforcement bar extending through the circular slots A to the top of the structural top panel; the pressure sensor is a hollow load cell; centers of the perforated upper pressure panel and the perforated lower pressure panel are provided with via holes, and are coaxially arranged on the upper and lower ends of the pressure sensor to form a pressure detection mechanism with a hollow cavity; the pressure detection mechanism is arranged between the reinforced concrete specimen and the structural top panel, and is sleeved outside the long reinforcement bar through the hollow cavity; the servo actuator is fixedly supported above the structural top panel, with a telescopic end arranged downward and fixedly connected to the upper end of the long reinforcement bar; the thin steel sheet B is arranged horizontally, with one end adhered snugly to an end surface of the short reinforcement bar of the reinforced concrete specimen and the other end extending horizontally to the outside of the reinforced concrete specimen; a base of the universal support frame is fixedly connected to an upper end surface of the base top panel, and the electronic dial indicator is mounted at an upper portion of the universal support frame and has a lower end of a measuring rod cooperating in contact with an upper end surface of the thin steel sheet B; the computer is respectively connected to the electronic dial indicator and the pressure sensor through the signal processor, and is further connected to the servo actuator.
The present invention has a simple structure, a low manufacturing cost, may conveniently carry out the drawing test of the reinforced concrete specimen, may also conveniently record the test data, may accurately test the load-bearing capacity of reinforced concrete, and may provide a theoretical basis for engineering design and construction.
Further, in order to facilitate the establishment of assembling the test device, the upper portion connecting member is composed of an upper portion connecting member screw, a plurality of upper connecting member nuts that are connected to upper and lower ends of the upper portion connecting member screw respectively, and a plurality of upper connecting member gaskets that are sleeved to upper and lower ends of the upper portion connecting member screw respectively;
the lower portion connected member is composed of a lower portion connecting member bolt, a plurality of lower portion connecting member nuts that are connected to a lower portion of the lower portion connecting member bolt, and a plurality of lower portion connecting member gaskets that are sleeved to a lower portion of the lower portion connecting member bolt respectively.
Preferably, the base top panel and the base bottom panel are square-shaped, and the U-shaped slots b have four slots and are arranged in the middle of four sides of the base top panel respectively.
Brief Description of Drawings
Fig. 1 is a schematic diagram of the assembly of a structural base and a structure top panel of the present invention;
Fig. 2 is an exploded diagram of Fig. 1;
Fig. 3 is a structure diagram of a structural top panel in the present invention;
Fig. 4 is an exploded diagram of a structure of a structural base in the present invention;
Fig. 5 is a diagram of one test device in the present invention;
Fig. 6 is an exploded diagram of Fig. 5 after removing a servo actuator, a signal processor and a computer;
Fig. 7 is a diagram of another test device in the present invention;
Fig. 8 is an exploded diagram of Fig. 6 after removing a servo actuator, a signal processor and a computer.
In the drawings: 1, structural base; 2, structural top panel; 3, upper portion connecting
member; 4, lower portion connecting member; 5, test platform base; 6, reinforced concrete
specimen; 7, threaded lower pressure panel; 8, threaded upper pressure panel; 9, pressure sensor;
, thin steel sheet A; 11, universal support frame; 12, electronic dial indicator; 13, signal
processor; 14, computer; 15, table; 16, perforated lower pressure panel; 17, perforated upper pressure panel; 18, thin steel sheet B; 19, servo actuator;
1-1, base top panel; 1-2 base bottom panel; 1-3, middle short rib; 1-4, middle long rib; 1-5, outer rib; 1-6, vertical support; 2-1, circular slot A; 2-2, U-shaped slot a; 3-1, upper portion connecting member screw; 3-2, upper portion connecting member nut; 3-3, upper portion connecting member gasket; 4-1, lower portion connecting member bolt; 4-2, lower portion connecting member nut; 4-3, upper portion connecting member gasket; 6-1, long reinforcement bar; 6-2, short reinforcement bar;
1-1-1, circular slot B; 1-1-2, U-shaped slot b; 1-2-1, circular slot C.
Detail Description
The present invention will be further elaborated hereafter with combination of Figs. 1 to 8.
The present invention provides a test device for testing bond strength of reinforced concrete, which includes a structural base 1, an upper portion connecting member 3 and a lower portion connecting member 4;
the structural base 1 extends vertically, and includes a vertical support 1-6, a base top panel 1-1 fixedly connected to a top portion of the vertical support 1-6, and a base bottom panel 1-2 fixedly connected to a bottom portion of the vertical support 1-6; the vertical support 1-6 includes two middle long ribs 1-4 that are oppositely arranged, two middle short ribs 1-3 that are oppositely arranged and two pairs of outer ribs 1-5 that are respectively located outside the two middle long ribs 1-4, the two middle short ribs 1-3 are fixedly connected between the two middle long ribs 1-4, and the two pairs of outer ribs 1-5 are fixedly connected outside the two middle long ribs 1-4 respectively; a center of the base top panel 1-1 is provided with a circular slot B 1-1-1, and a part of an edge of the base top panel is provided with a plurality of U-shaped slots b 1-1-2 uniformly in a circumferential direction; a portion of the base bottom panel 1-2 close to an edge is provided with a plurality of circular slots C 1-2-1 uniformly in a circumferential direction;
the lower portion connecting member 4 has a plurality of members, of which the number is consistent with the number of the circular slots C 1-2-1; an upper end of the lower portion connecting member 4 is inserted into the circular slots C 1-2-1;
the upper portion connecting member 3 has a plurality of members, of which the number is consistent with the number of the U-shaped slots b 1-1-2, and a lower end of the upper portion connecting member 3 is inserted into the U-shaped slots b 1-1-2.
The device has a simple structure, a low manufacturing cost and may effectively meet the test requirements for the bond strength of reinforced concrete, thereby helping to accurately test the load-bearing capacity of reinforced concrete.
In order to ensure the stability of the test device, the device further includes a test platform base 5, and the test platform base 5 is arranged below the structural base 1; the test platform base 5 is provided with a plurality of circular through holes, the plurality of circular through holes and the plurality of circular slots C 1-2-1 are arranged correspondingly one by one, and lower ends of a plurality of lower portion connecting members 4 are inserted into the plurality of circular through holes respectively and fixedly connect the test platform base 5 with the base bottom panel 1-2.
In order to record the data synchronously in real time during the push-out test, the device further includes a reinforced concrete specimen 6, a pressure sensor 9, a threaded upper pressure panel 8, a threaded lower pressure panel 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;
a part of the vertical support 1-6 corresponding to the circular slot B 1-1-1 has a hollow structure;
the reinforced concrete specimen 6 is a reinforced concrete sample to be tested, which is cube-shaped with reinforcement bars embedded in the middle, and the reinforcement bars extend to the outside of opposite end surfaces of the reinforced concrete specimen 6; short reinforcement bars 6-2 are exposed on one side of the reinforced concrete specimen 6, and long reinforcement bars 6-1 are exposed on the other side of the reinforced concrete specimen 6; the reinforced concrete specimen 6 is arranged above the base top panel 1-1, and the long reinforcement bars 6-1 extend through the circular slots B 1-1-1 into a cavity of the vertical support 1-6;
the pressure sensor 9 is a hollow load cell, and both upper and lower ends of an inner cavity of the pressure sensor 9 are provided with an internal thread structure; a lower end of the threaded upper pressure panel 8 and an upper end of the threaded lower pressure panel 7 are fixedly connected with studs, and a pressure detection mechanism is formed by connecting the studs with upper and lower ends of the pressure sensor 9; the pressure detection mechanism is arranged above the reinforced concrete specimen 6, and a lower end surface of the threaded lower pressure panel 7 is arranged in contact with an upper end of the short reinforcement bar 6-2;
the servo actuator 19 is supported above the pressure detection mechanism, with a telescopic end arranged downward and fixedly connected to an upper end surface of the threaded upper pressure panel 8;
the thin steel sheet A 10 is arranged horizontally, with one end adhered snugly to a side of the threaded lower pressure panel 7 and the other end extending to the outside of the reinforced concrete specimen 6; a base of the universal support frame 11 is fixedly connected to an upper end surface of the base top panel 1-1, and the electronic dial indicator 12 is mounted at an upper portion of the universal support frame 11 and has a lower end of a measuring rod cooperating in contact with an upper end surface of the thin steel sheet A 10; the computer 14 is respectively connected to the electronic dial indicator 12 and the pressure sensor 9 through the signal processor 13, and is further connected to the servo actuator 19. Preferably, the computer 14 is arranged on a table 15.
The present invention has a simple structure, a low manufacturing cost, may conveniently carry out the push-out test of the reinforced concrete specimen, may also conveniently record the test data, may accurately test the load-bearing capacity of reinforced concrete, and may provide a theoretical basis for engineering design and construction.
In order to facilitate the drawing test, the device further comprises a structural top panel 2; the structural top panel 2 is arranged above the structural base 1, and has a center provided with a circular slot A 2-1 and a part of an edge provided with a plurality of U-shaped slots a 2-2 uniformly in a circumferential direction, the circular slots A 2-1 and the circular slots B 1-1-1 being arranged correspondingly, the plurality of U-shaped slots a 2-2 and the plurality of U-shaped slots b 1-1-2 being arranged correspondingly.
In order to record the data synchronously in real time during the drawing test, the device further includes a reinforced concrete specimen 6, a pressure sensor 9, a perforated lower pressure panel 16, a perforated upper pressure panel 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;
a part of the vertical support 1-6 corresponding to the circular slot B 1-1-1 has a hollow structure;
the reinforced concrete specimen 6 is a reinforced concrete sample to be tested, which is cube-shaped with reinforcement bars embedded in the middle, and the reinforcement bars extend to the outside of opposite end surfaces of the reinforced concrete specimen 6; short reinforcement bars 6-2 are exposed on one side of the reinforced concrete specimen 6, and long reinforcement bars 6-1 are exposed on the other side of the reinforced concrete specimen 6; the reinforced concrete specimen 6 is arranged between the base top panel 1-1 and the structural top panel 2, and a gap is left between a lower end of the short reinforcement bar 6-2 and the upper end surface of the base top panel 1-1, an upper end of the long reinforcement bar 6-1 extending through the circular slots A 2-1 to the top of the structural top panel 2; the pressure sensor 9 is a hollow load cell; centers of the perforated upper pressure panel 17 and the perforated lower pressure panel 16 are provided with via holes, and are coaxially arranged on the upper and lower ends of the pressure sensor 9 to form a pressure detection mechanism with a hollow cavity; the pressure detection mechanism is arranged between the reinforced concrete specimen 6 and the structural top panel 2, and is sleeved outside the long reinforcement bar 6-1 through the hollow cavity; the servo actuator 19 is fixedly supported above the structural top panel 2, with a telescopic end arranged downward and fixedly connected to the upper end of the long reinforcement bar 6-1; the thin steel sheet B 18 is arranged horizontally, with one end adhered snugly to an end surface of the short reinforcement bar 6-2 of the reinforced concrete specimen 6 and the other end extending horizontally to the outside of the reinforced concrete specimen 6; a base of the universal support frame 11 is fixedly connected to an upper end surface of the base top panel 1-1, and the electronic dial indicator 12 is mounted at an upper portion of the universal support frame 11 and has a lower end of a measuring rod cooperating in contact with an upper end surface of the thin steel sheet B 18; the computer 14 is respectively connected to the electronic dial indicator 12 and the pressure sensor 9 through the signal processor 13, and is further connected to the servo actuator 19. Preferably, the computer 14 is arranged on a table 15.
The present invention has a simple structure, a low manufacturing cost, may conveniently carry out the drawing test of the reinforced concrete specimen, may also conveniently record the test data, may accurately test the load-bearing capacity of reinforced concrete, and may provide a theoretical basis for engineering design and construction.
In order to facilitate the establishment of assembling the test device, the upper portion connecting member 3 is composed of an upper portion connecting member screw 3-1, a plurality of upper connecting member nuts 3-2 that are connected to upper and lower ends of the upper portion connecting member screw 3-1 respectively, and a plurality of upper connecting member gaskets 3-3 that are sleeved to upper and lower ends of the upper portion connecting member screw 3-1 respectively;
the lower portion connected member 4 is composed of a lower portion connecting member bolt
4-1, a plurality of lower portion connecting member nuts 4-2 that are connected to a lower portion of the lower portion connecting member bolt 4-1, and a plurality of lower portion connecting member gaskets 4-3 that are sleeved to a lower portion of the lower portion connecting member bolt 4-1 respectively.
Preferably, the base top panel 1-1 and the base bottom panel 1-2 are square-shaped, and the U-shaped slots b 1-1-2 have four slots and are arranged in the middle of four sides of the base top panel 1-1 respectively.
Utilizing a test device for testing bond strength of reinforced concrete to perform the push-out test includes specifically steps of:
step one: fixing the structural base 1;
the structural base 1 is connected fixedly with the test platform base 5 through the lower portion connecting member 4;
step two: placing the reinforced concrete specimen 6;
the long reinforcement bar 6-1 of the reinforced concrete specimen 6 is placed above the base top panel 1-1 through the circular slots B 1-1-1 of the base top panel 1-1;
step three: placing the pressure sensor 9;
the threaded lower pressure panel 7 and the threaded upper pressure panel 8 are respectively connected to upper and lower ends of an inner cavity of the pressure sensor 9 by means of thread fitting to form a pressure detection mechanism, the threaded upper pressure panel 8 in the pressure detection mechanism is connected to the servo actuator 19 fixedly supported above the pressure detection mechanism, and the servo actuator 19 is adjusted by the computer 14 such that a lower end surface of the threaded lower pressure panel 7 is in contact with an upper end of the short reinforcement bar 6-2 of the reinforced concrete specimen 6;
step four: placing the electronic dial indicator 12;
the thin steel sheet A 10 is arranged horizontally, and one end of the thin steel sheet is bonded with a side surface of the threaded lower pressure panel 7 by structural glue; the electronic dial indicator 12 is combined with the universal support frame 11, and the universal support frame 11 is placed on an upper end surface of the base top panel 1-1, so that a lower end of the measuring rod of the electronic dial indicator 12 is in contact with an upper end surface of the thin steel sheet A 10;
step five: establishing connection through the signal processor 13; the pressure sensor 9 and the electronic dial indicator 12 are connected to the signal processor 12 through wires, and the signal processor 12 and the servo actuator 19 are connected to the computer 14 through wires; step six: performing push-out loading implementation; the servo actuator 19 is controlled by the computer 14 to exert a pressure downward and to increase the pressure gradually, the pressure detection mechanism is driven to press the upper end of the short reinforcement bar 6-2 downward, and the computer 14 records a pressure value collected by the pressure sensor 9 and the reading of the electronic dial indicator 12 in real time.
The method has simple steps and convenient operation, and may conveniently realize the
push-out test of the reinforced concrete specimen. The present invention may effectively meet the
test requirements for the bond strength of reinforced concrete, so that the test device may
accurately test the load-bearing capacity of reinforced concrete, and may provide a theoretical
basis for engineering design and construction.
Utilizing a test device for testing bond strength of reinforced concrete to perform the drawing test includes specifically steps of:
step one: fixing the structural base 1;
the structural base 1 is connected fixedly with the test platform base 5 through the lower portion connecting member 4;
step two: placing the reinforced concrete specimen 6;
The short reinforcement bar 6-2 of the reinforced concrete specimen 6 is arranged towards the base top panel 1-1; the perforated lower pressure panel 16 is placed on a surface of the reinforced concrete specimen 6 through the long reinforcement bar 6-1 of the reinforced concrete specimen 6, and the pressure sensor 9 is placed on the perforated lower pressure panel 16 through the long reinforcement bar 6-1 of the reinforced concrete specimen 6; the perforated upper pressure panel 17 is placed on the pressure sensor 9 through the long reinforcement bar 6-1 of the reinforced concrete specimen 6;
step three: assembling the structural top panel 2, arranging the servo actuator 19;
the structural top panel 2 is passed through the long reinforcement bar 6-1 of the reinforced concrete specimen 6, the structural top panel 2 is connected to the structural base 1 through the upper portion connecting member 3, and a certain distance is left between the structural top panel 2 and an upper end of the perforated upper pressure panel 17; the servo actuator 19 is supported above the structural top panel 2, the servo actuator 19 is fixedly connected to the upper end of the long reinforcement bar 6-1, and the servo actuator 19 is controlled by the computer 14 to retract a certain distance such that the perforated upper pressure panel 17 is tightly attached to the structural top panel 2 while ensuring that an end surface of the short reinforcement bar 6-2 of the reinforced concrete specimen 6 is a certain distance from the upper end surface of the base top panel 1-1; step four: placing the electronic dial indicator 12; the thin steel sheet B 18 is arranged horizontally, and one end of the thin steel sheet is bonded with a side surface of the short reinforcement bar 6-2 of the reinforced concrete specimen 6 by structural glue; the electronic dial indicator 12 is combined with the universal support frame 11, and the universal support frame 11 is placed on an upper end surface of the base top panel 1-1, so that a lower end of the measuring rod of the electronic dial indicator 12 is in contact with an upper end surface of the thin steel sheet A 10; step five: establishing connection through the signal processor 13; the pressure sensor 9 and the electronic dial indicator 12 are connected to the signal processor 12 through wires, and the signal processor 12 and the servo actuator 19 are connected to the computer 14 through wires; step six: performing drawing loading implementation; the servo actuator 19 is controlled by the computer 14 to draw the long reinforcement bar 6-1 upward and to increase the drawing force gradually, and the computer 14 records a drawing force value collected by the pressure sensor 9 and the reading of the electronic dial indicator 12 in real time.
The method has simple steps and convenient operation, and may conveniently realize the push-out test of the reinforced concrete specimen. The present invention may effectively meet the test requirements for the bond strength of reinforced concrete, so that the test device may accurately test the load-bearing capacity of reinforced concrete, and may provide a theoretical basis for engineering design and construction.
Claims (7)
1. A test device for testing bond strength of reinforced concrete, comprising a structural base, wherein the device further comprises an upper portion connecting member and a lower portion connecting member;
the structural base extends vertically, and comprises a vertical support, a base top panel fixedly connected to a top portion of the vertical support, and a base bottom panel fixedly connected to a bottom portion of the vertical support; the vertical support comprises two middle long ribs that are oppositely arranged, two middle short ribs that are oppositely arranged and two pairs of outer ribs that are respectively located outside the two middle long ribs, the two middle short ribs are fixedly connected between the two middle long ribs, and the two pairs of outer ribs are fixedly connected outside the two middle long ribs respectively; a center of the base top panel is provided with a circular slot B, and a part of an edge of the base top panel is provided with a plurality of U-shaped slots b uniformly in a circumferential direction; a portion of the base bottom panel close to an edge is provided with a plurality of circular slots C uniformly in a circumferential direction;
the lower portion connecting member has a plurality of members, of which the number is consistent with the number of the circular slots C; an upper end of the lower portion connecting member is inserted into the circular slots C;
the upper portion connecting member has a plurality of members, of which the number is consistent with the number of the U-shaped slots b, and a lower end of the upper portion connecting member is inserted into the U-shaped slots b.
2. The test device for testing bond strength of reinforced concrete according to claim 1, wherein the device further comprises a test platform base, and the test platform base is arranged below the structural base; the test platform base is provided with a plurality of circular through holes, the plurality of circular through holes and the plurality of circular slots C are arranged correspondingly one by one, and lower ends of a plurality of lower portion connecting members are inserted into the plurality of circular through holes respectively and fixedly connect the test platform base with the base bottom panel.
3. The test device for testing bond strength of reinforced concrete according to claim 2, wherein the device further comprises a reinforced concrete specimen, a pressure sensor, a threaded upper pressure panel, a threaded lower pressure panel, a servo actuator, a thin steel sheet A, a universal support frame, an electronic dial indicator, a signal processor and a computer; a part of the vertical support corresponding to the circular slot B has a hollow structure; the reinforced concrete specimen is a reinforced concrete sample to be tested, which is cube-shaped with reinforcement bars embedded in the middle, and the reinforcement bars extend to the outside of opposite end surfaces of the reinforced concrete specimen; short reinforcement bars are exposed on one side of the reinforced concrete specimen, and long reinforcement bars are exposed on the other side of the reinforced concrete specimen; the reinforced concrete specimen is arranged above the base top panel, and the long reinforcement bars extend through the circular slots B into a cavity of the vertical support; the pressure sensor is a hollow load cell, and both upper and lower ends of an inner cavity of the pressure sensor are provided with an internal thread structure; a lower end of the threaded upper pressure panel and an upper end of the threaded lower pressure panel are fixedly connected with studs, and a pressure detection mechanism is formed by connecting the studs with upper and lower ends of the pressure sensor; the pressure detection mechanism is arranged above the reinforced concrete specimen, and a lower end surface of the threaded lower pressure panel is arranged in contact with an upper end of the short reinforcement bar; the servo actuator is supported above the pressure detection mechanism, with a telescopic end arranged downward and fixedly connected to an upper end surface of the threaded upper pressure panel; the thin steel sheet A is arranged horizontally, with one end adhered snugly to a side of the threaded lower pressure panel and the other end extending to the outside of the reinforced concrete specimen; a base of the universal support frame is fixedly connected to an upper end surface of the base top panel, and the electronic dial indicator is mounted at an upper portion of the universal support frame and has a lower end of a measuring rod cooperating in contact with an upper end surface of the thin steel sheet A; the computer is respectively connected to the electronic dial indicator and the pressure sensor through the signal processor, and is further connected to the servo actuator.
4. The test device for testing bond strength of reinforced concrete according to claim 2, wherein the device further comprises a structural top panel; the structural top panel is arranged above the structural base, and has a center provided with a circular slot A and a part of an edge provided with a plurality of U-shaped slots a uniformly in a circumferential direction, the circular slots A and the circular slots B being arranged correspondingly, the plurality of U-shaped slots a and the plurality of U-shaped slots b being arranged correspondingly.
5. The test device for testing bond strength of reinforced concrete according to claim 4, wherein the device further comprises a reinforced concrete specimen, a pressure sensor, a perforated lower pressure panel, a perforated upper pressure panel, a servo actuator, a thin steel sheet B, a universal support frame, an electronic dial indicator, a signal processor and a computer;
a part of the vertical support corresponding to the circular slot B has a hollow structure;
the reinforced concrete specimen is a reinforced concrete sample to be tested, which is cube-shaped with reinforcement bars embedded in the middle, and the reinforcement bars extend to the outside of opposite end surfaces of the reinforced concrete specimen; short reinforcement bars are exposed on one side of the reinforced concrete specimen, and long reinforcement bars are exposed on the other side of the reinforced concrete specimen; the reinforced concrete specimen is arranged between the base top panel and the structural top panel, and a gap is left between a lower end of the short reinforcement bar and the upper end surface of the base top panel, an upper end of the long reinforcement bar extending through the circular slots A to the top of the structural top panel;
the pressure sensor is a hollow load cell; centers of the perforated upper pressure panel and the perforated lower pressure panel are provided with via holes, and are coaxially arranged on the upper and lower ends of the pressure sensor to form a pressure detection mechanism with a hollow cavity; the pressure detection mechanism is arranged between the reinforced concrete specimen and the structural top panel, and is sleeved outside the long reinforcement bar through the hollow cavity;
the servo actuator is fixedly supported above the structural top panel, with a telescopic end arranged downward and fixedly connected to the upper end of the long reinforcement bar;
the thin steel sheet B is arranged horizontally, with one end adhered snugly to an end surface of the short reinforcement bar of the reinforced concrete specimen and the other end extending horizontally to the outside of the reinforced concrete specimen;
a base of the universal support frame is fixedly connected to an upper end surface of the base top panel, and the electronic dial indicator is mounted at an upper portion of the universal support frame and has a lower end of a measuring rod cooperating in contact with an upper end surface of the thin steel sheet B;
the computer is respectively connected to the electronic dial indicator and the pressure sensor through the signal processor, and is further connected to the servo actuator.
6. The test device for testing bond strength of reinforced concrete according to claim 3 or 5, wherein the upper portion connecting member is composed of an upper portion connecting member screw, a plurality of upper connecting member nuts that are connected to upper and lower ends of the upper portion connecting member screw respectively, and a plurality of upper connecting member gaskets that are sleeved to upper and lower ends of the upper portion connecting member screw respectively;
the lower portion connected member is composed of a lower portion connecting member bolt, a plurality of lower portion connecting member nuts that are connected to a lower portion of the lower portion connecting member bolt, and a plurality of lower portion connecting member gaskets that are sleeved to a lower portionofthelowerportion connecting member bolt respectively.
7. The test device for testing bond strength of reinforced concrete according to claim 3 or 5, wherein the base top panel and the base bottom panel are square-shaped, and the U-shaped slots b have four slots and are arranged in the middle of four sides of the base top panel respectively.
Fig. 2 Fig. 1
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Fig. 4 Fig. 3
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Fig. 5
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Fig. 6
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Fig. 7
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Fig. 8
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| CN2020107618693 | 2020-07-31 | ||
| 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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| AU (1) | AU2020101793A4 (en) |
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| JP3048994B2 (en) * | 1997-12-18 | 2000-06-05 | ショーボンド建設株式会社 | Rebar pull-out tester |
| RU134646U1 (en) * | 2013-06-06 | 2013-11-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Томский государственный архитектурно-строительный университет" (ТГАСУ) | STAND FOR STATIC TESTS OF REINFORCED REINFORCED CONCRETE ELEMENTS |
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2020
- 2020-07-31 CN CN202010761869.3A patent/CN111948131B/en active Active
- 2020-08-13 AU AU2020101793A patent/AU2020101793A4/en not_active Ceased
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| 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 |
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| CN111948131B (en) | 2024-05-07 |
| CN111948131A (en) | 2020-11-17 |
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