CN111948131A - Test device and test method for testing reinforced concrete bonding strength - Google Patents

Abstract

The invention provides a test device and a test method for testing the bonding strength of reinforced concrete. The device: the top of the structural base is connected with a structural roof through a plurality of upper connecting pieces; the pushing method: fixing the structural base; placing a reinforced concrete sample ;Place the pressure sensor;Place the electronic dial gauge; Establish the connection through the signal processor; Carry out the push-out loading realization;Pulling method: fix the structure base;Place the reinforced concrete sample;Assemble the structure roof, arrange the servo actuator;Place the electronic dial Sub-table; establish connection through signal processor; pull and load realization. The device has a simple structure and can effectively meet the test requirements for the bond strength of reinforced concrete, thereby helping to accurately test the bearing capacity of reinforced concrete; the method has simple process, accurate and reliable results, and can accurately test the bearing capacity of reinforced concrete It is convenient for engineering application, and at the same time, it can provide theoretical basis for engineering design and construction.

Description

A test device and test method for testing the bond strength of reinforced concrete

technical field

The invention belongs to the technical field of construction engineering, and particularly relates to a test device and a test method for testing the bond strength of reinforced concrete.

Background technique

In the process of design, construction and use of reinforced concrete structures, due to various uncertain factors, their bearing capacity cannot meet the requirements of safe use. The key point is that the bond between the steel bar and the concrete enables the two materials to give full play to their respective advantages, thereby establishing the bearing capacity of the reinforced concrete structure. The test device in the prior art is complicated in structure and complicated in operation, and cannot effectively meet the test requirements for the bond strength of reinforced concrete, thus cannot accurately test the 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 existing in the prior art, the present invention provides a test device and a test method for testing the bond strength of reinforced concrete. The device has a simple structure and can effectively meet the test requirements for the bond strength of reinforced concrete, thereby helping It is used to accurately test the bearing capacity of reinforced concrete; the method is simple in process, accurate and reliable in results, and can accurately test the bearing capacity of reinforced concrete, which is convenient for engineering application, and can provide theoretical basis for engineering design and construction.

In order to achieve the above object, the present invention provides a test device for testing the bond strength of reinforced concrete, comprising a structural base, an upper connecting piece and a lower connecting piece;

The vertical extension of the structural base includes a vertical support, a base top plate fixedly connected to the top of the vertical support, and a base bottom plate fixedly connected to the bottom of the vertical support; the vertical support includes oppositely arranged Two middle long ribs, two oppositely arranged middle short ribs and two pairs of outer ribs respectively located outside the two middle long ribs, and the two middle short ribs are fixedly connected between the two middle long ribs , the two pairs of outer rib plates are fixedly connected to the outer sides of the two middle long rib plates respectively; the center of the top plate of the base is provided with a circular slot B, and a part of its edge is uniformly provided with a plurality of U-shaped slots B in the circumferential direction; The part of the base bottom plate close to the edge is evenly provided with a plurality of circular slot holes C in the circumferential direction;

The number of the lower connector is multiple, and the number is consistent with the number of the circular slot C; the upper end of the lower connector is inserted into the circular slot C;

The number of the upper connecting pieces is multiple, and the number is consistent with the number of the U-shaped slot holes b, and the lower ends of the upper connecting pieces are inserted into the U-shaped slot holes b.

The device is simple in structure and low in manufacturing cost, and can effectively meet the test requirements for the bond strength of reinforced concrete, thereby helping to accurately test the bearing capacity of reinforced concrete.

Further, in order to ensure the stability of the test device, it also includes a test platform base, the test platform base is arranged below the structural base, and the test platform base is provided with a plurality of circular through holes, a plurality of circular through holes and a plurality of circular through holes. The circular slot holes C are arranged in a one-to-one correspondence, and the lower ends of the plurality of lower connecting pieces are respectively inserted into the plurality of circular through holes, and the base of the test platform is fixedly connected to the base plate of the base.

Further, in order to record data synchronously in real time during the push-out test, it also includes reinforced concrete samples, pressure sensors, threaded upper pressure plate, threaded lower pressure plate, servo actuator, thin steel sheet A, universal support frame, electronic micrometer Tables, signal processors and computers;

The part of the vertical support member corresponding to the circular slot B is a hollow structure;

The reinforced concrete sample is the reinforced concrete sample to be tested, which is in the shape of a cube, and the steel bar is embedded in the middle, and the steel bar extends to the outside of the opposite end faces of the reinforced concrete sample, and there are exposed short bars on the outside of one side of the reinforced concrete sample. There is a long section of steel bar exposed on the other side of the reinforced concrete sample; the reinforced concrete sample is set above the top plate of the base, and the long section of steel bar extends through the circular slot B into the hollow of the vertical support. in the cavity;

The pressure sensor is a hollow load cell, and the upper and lower ends of the inner cavity of the pressure sensor are provided with internal thread structures; the lower end of the threaded upper pressure plate and the upper end of the threaded lower pressure plate are fixedly connected with studs, and through the studs The upper end and the lower end of the pressure sensor are connected 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 pressure plate is in contact with the upper end of the short section of reinforcement;

The servo actuator is fixedly supported above the pressure detection mechanism, and its telescopic end is set downward, and is fixedly connected with the upper end face of the threaded upper pressure plate;

The thin steel sheet A is arranged horizontally, one end of which is adhered to the side of the threaded lower pressing plate, and the other end extends to the outside of the reinforced concrete sample;

The base of the universal support frame is fixedly connected to the upper end surface of the base top plate, the electronic dial indicator is installed on the upper part of the universal support frame, and the lower end of the measuring rod is in contact with the upper end surface of the thin steel sheet A;

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 the test data, can accurately test the bearing capacity of the reinforced concrete, and can provide a theoretical basis for engineering design and construction.

Further, in order to facilitate the pulling test, it also includes a structural top plate, the structural top plate is arranged above the structural base, and a circular slot A is opened in its center, and a part of its edge is uniformly opened with a plurality of U-shaped holes in the circumferential direction. Slot hole a, the arrangement of circular slot holes A corresponding to the circular slot holes B, the arrangement of multiple U-shaped slot holes a and the arrangement of multiple U-shaped slot holes b.

Further, in order to record data synchronously in real time during the pull-out test, it also includes reinforced concrete samples, pressure sensors, perforated lower pressure plates, perforated upper pressure plates, servo actuators, thin steel sheets B, universal support frames, electronic Sub-meters, signal processors and computers;

The part of the vertical support member corresponding to the circular slot B is a hollow structure;

The reinforced concrete sample is the reinforced concrete sample to be tested, which is in the shape of a cube, and the steel bar is embedded in the middle, and the steel bar extends to the outside of the opposite end faces of the reinforced concrete sample, and there are exposed short bars on the outside of one side of the reinforced concrete sample. There is a long section of steel bar exposed on the other side of the reinforced concrete sample; the reinforced concrete sample is set between the base roof and the structural roof, and there is a gap between the lower end of the short section of steel and the upper end of the base roof , the upper end of the long section of steel bars is pierced through the circular slot A to the top of the structural roof;

The pressure sensor is a hollow load cell; the center of the perforated upper pressure plate and the perforated lower pressure plate are provided with through holes, and are respectively coaxially arranged on the upper and lower ends of the pressure sensor to form a pressure with a hollow cavity a detection mechanism; the pressure detection mechanism is arranged between the reinforced concrete sample and the structural roof, and the cavity is sleeved on the outside of the long section of reinforcement through the cavity;

The servo actuator is fixedly supported on the top of the structure roof, and its telescopic end is set downward, and is fixedly connected with the upper end of the long steel bar;

The thin steel sheet B is arranged horizontally, one end of which is closely bonded to the end face of the short-section steel bar of the reinforced concrete sample, and the other end extends horizontally to the outside of the reinforced concrete sample;

The base of the universal support frame is fixedly connected to the upper end surface of the base top plate, the electronic dial indicator is installed on the upper part of the universal support frame, and the lower end of the measuring rod is in contact with the upper end surface of the thin steel sheet B;

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 the advantages of simple structure and low manufacturing cost, can conveniently carry out the pulling test of the reinforced concrete sample, can conveniently record the test data, can accurately test the bearing capacity of the reinforced concrete, and can provide a theoretical basis for engineering design and construction.

Further, in order to facilitate the assembly of the test device, and also to facilitate the disassembly of the test device, the upper connector is composed of an upper connector screw, a plurality of upper connector nuts connected to the upper and lower ends of the upper connector screw, and respectively. It is composed of a plurality of upper connecting piece gaskets sleeved on the upper and lower ends of the upper connecting piece screw;

The lower connector is composed of a lower connector bolt, a plurality of lower connector nuts connected to the lower part of the lower connector bolt, and a plurality of lower connector gaskets respectively sleeved on the lower part of the lower connector bolt.

As a preference, the base top plate and the base bottom plate are both square, and the number of U-shaped slot holes b is four, which are respectively arranged in the middle of the four sides of the base top plate.

The invention also provides a test method for testing the bond strength of reinforced concrete, which utilizes a test device for testing the bond strength of reinforced concrete to carry out a push-out test, which specifically includes the following steps:

Step 1: Fix the structural base;

The structural base is fixedly connected to the base of the test platform through the lower connector;

Step 2: Place the reinforced concrete sample;

Pass the long steel bar of the reinforced concrete sample through the circular slot B of the base top plate and place it on the base top plate;

Step 3: Place the pressure sensor;

The threaded lower pressure plate and the threaded upper pressure plate are respectively connected with the upper and lower ends of the pressure sensor cavity by means of thread matching to form a pressure detection mechanism, and the threaded upper pressure plate in the pressure detection mechanism is fixedly supported on the pressure detection mechanism. Connect with the reinforced concrete sampler, and adjust the servo actuator through the computer to make the lower end face of the threaded lower pressure plate contact the upper end of the short section of the steel bar of the reinforced concrete sample;

Step 4: Place the electronic dial indicator;

Set the thin steel sheet A horizontally, and make one end of it and the side of the threaded lower pressure plate bonded with structural adhesive; combine the electronic dial indicator with the universal support bracket, and place the universal support bracket on the upper end face of the base top plate , so that the lower end of the measuring rod of the electronic dial indicator is in contact with the upper end face of the thin steel sheet A;

Step 5: Establish a connection through the signal processor;

Connect the pressure sensor and electronic dial indicator to the signal processor through wires, and connect the signal processor and servo actuator to the computer through wires;

Step 6: Carry out push-out loading implementation;

The servo actuator is controlled by the computer to exert downward pressure, and gradually increase the pressure, drive the pressure detection mechanism to press down the upper end of the short section of steel bars, and record the pressure value collected by the pressure sensor and the reading of the electronic dial gauge in real time through 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 requirements for the bond strength of reinforced concrete, so that the bearing capacity of reinforced concrete can be accurately tested, and the theoretical basis for engineering design and construction can be provided.

The invention also provides a test method for testing the bond strength of reinforced concrete, which utilizes a test device for testing the bond strength of reinforced concrete to perform a pull-out test, which specifically includes the following steps:

Step 1: Fix the structural base;

The structural base is fixedly connected to the base of the test platform through the lower connector;

Step 2: Place the reinforced concrete sample;

Set the short section of the reinforced concrete sample towards the top plate of the base; place the perforated lower pressure plate through the long section of the reinforced concrete sample on the surface of the concrete sample, and put the pressure sensor through the long section of the reinforced concrete sample. Place on the perforated lower pressure plate; place the perforated upper pressure plate through the long section of reinforcement of the reinforced concrete sample on the pressure sensor;

Step 3: Assemble the structural top plate and arrange the servo actuator;

Pass the structural roof through the long steel bars of the reinforced concrete sample, and establish the connection between the structural roof and the structural base through the upper connector, and leave a certain distance between the structural roof and the upper end face of the perforated upper pressure plate; fix it above the structural roof The servo actuator is set up, and the servo actuator is fixedly connected with the upper end of the long steel bar, and the servo actuator is controlled by the computer to retract a certain distance, so that the perforated upper pressure plate is close to the structural top plate, and at the same time, the reinforced concrete test is ensured. There is a certain distance between the end face of the short-section steel bar (6-2) and the upper end face of the base top plate;

Step 4: Place the electronic dial indicator;

Set the thin steel sheet B horizontally, and bond one end of the steel sheet B with the end face of the short section of the reinforced concrete sample through structural adhesive; combine the electronic dial indicator with the universal support frame, and place the universal support frame on the The upper end face of the top plate of the base, so that the lower end of the measuring rod of the electronic dial indicator is in contact with the upper end face of the thin steel sheet A;

Step 5: Establish a connection through the signal processor;

Connect the pressure sensor and electronic dial indicator to the signal processor through wires, and connect the signal processor and servo actuator to the computer through wires;

Step 6: Carry out pulling and loading realization;

The servo actuator is controlled by the computer to pull up the long steel bar, and the tension is gradually increased, and the tension value collected by the pressure sensor and the reading of the electronic dial gauge are recorded in real time through 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 requirements for the bond strength of reinforced concrete, so that the bearing capacity of reinforced concrete can be accurately tested, and the theoretical basis for engineering design and construction can be provided.

Description of drawings

Fig. 1 is the assembly schematic diagram of structural base and structural top plate in the present invention;

Fig. 2 is the exploded view of Fig. 1;

Fig. 3 is the structural representation of the structural top plate in the present invention;

Figure 4 is an exploded view of the structure of the structural base in the present invention;

Fig. 5 is a schematic diagram of a test apparatus in the present invention;

Figure 6 is an exploded view of Figure 5 after removing the servo full actuator, the signal processor and the computer;

Fig. 7 is another test apparatus schematic diagram in the present invention;

Fig. 8 is an exploded view of Fig. 6 after removing the servo full actuator, the signal processor and the computer.

In the figure: 1. Structural base, 2. Structural top plate, 3. Upper connecting piece, 4. Lower connecting piece, 5. Test platform base, 6. Reinforced concrete sample, 7. Threaded lower pressure plate, 8. Threaded upper pressure plate, 9, pressure sensor, 10, thin steel sheet A, 11, universal support frame, 12, electronic dial indicator, 13, signal processor, 14, computer, 15, table, 16, perforated lower platen, 17, perforated upper plate Pressure plate, 18, thin steel sheet B, 19, servo actuator;

1-1, base top plate, 1-2, base bottom plate, 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 connector screw, 3-2, upper connector nut, 3-3, upper connector gasket, 4-1 , lower connector bolts, 4-2, lower connector nuts, 4-3, upper connector gaskets, 6-1, long steel bars, 6-2, short steel bars;

1-1-1, circular slot B, 1-1-2, U-shaped slot b, 1-2-1, circular slot C.

Detailed ways

The present invention will be further described below with reference to FIGS. 1 to 8 .

The present invention provides a test device for testing the bond strength of reinforced concrete, comprising a structural base 1, an upper connecting piece 3 and a lower connecting piece 4;

The vertical extension of the structural base 1 includes a vertical support member 1-6, a base top plate 1-1 fixedly connected to the top of the vertical support member 1-6, and a base plate 1-1 fixedly connected to the bottom of the vertical support member 1-6. The base bottom plate 1-2; the vertical support member 1-6 includes two oppositely arranged middle long rib plates 1-4, two oppositely arranged middle short rib plates 1-3 and two middle long rib plates respectively located in the middle The two pairs of outer ribs 1-5 on the outside of 1-4, the two short middle ribs 1-3 are fixedly connected between the two long middle ribs 1-4, and the two pairs of outer ribs 1-5 are fixedly connected to each other. 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 slot B1-1-1, and a plurality of U-shaped slot holes b1-1- 1-2; the part of the base bottom plate 1-2 close to the edge is evenly provided with a plurality of circular slot holes C1-2-1 in the circumferential direction;

The number of the lower connector 4 is multiple, and the number is consistent with the number of the circular slot C1-2-1; the upper end of the lower connector 4 is inserted into the circular slot C1-2-1;

The number of the upper connecting members 3 is multiple, and the number is consistent with the number of the U-shaped slot b1-1-2, and the lower end of the upper connecting member 3 is inserted into the U-shaped slot b1-1-2.

The device is simple in structure and low in manufacturing cost, and can effectively meet the test requirements for the bond strength of reinforced concrete, thereby helping to accurately test the bearing capacity of reinforced concrete.

In order to ensure the stability of the test device, it also includes a test platform base 5, the test platform base 5 is arranged below the structural base 1, and the test platform base 5 is provided with a plurality of circular through holes, and the plurality of circular through holes and A plurality of circular slot holes C1-2-1 are arranged in a one-to-one correspondence, the lower ends of the plurality of lower connectors 4 are respectively inserted into the plurality of circular through holes, and the test platform base 5 is connected to the base bottom plate 1-2. Fixed connection.

In order to record data synchronously in real time during the push-out test, it also includes a reinforced concrete sample 6, a pressure sensor 9, a threaded upper pressure plate 8, a threaded lower pressure plate 7, a servo actuator 19, a thin steel sheet A10, and a universal support frame 11 , electronic dial indicator 12, signal processor 13 and computer 14;

The part of the vertical support 1-6 corresponding to the circular slot B1-1-1 is a hollow structure;

The reinforced concrete sample 6 is a reinforced concrete sample to be tested, which is in the shape of a cube, with steel bars embedded in the middle, and the steel bars extend to the outside of the opposite end faces of the reinforced concrete sample 6, and are outside one side of the reinforced concrete sample 6. A short section of steel bar 6-2 is exposed, and a long section of steel bar 6-1 is exposed on the other side of the reinforced concrete sample 6; 1 through the circular slot B1-1-1 into the cavity of the vertical support 1-6;

The pressure sensor 9 is a hollow load cell, and the upper end and the lower end of the inner cavity of the pressure sensor 9 are provided with internal thread structures; the lower end of the threaded upper pressure plate 8 and the upper end of the threaded lower pressure plate 7 are fixedly connected with studs, And connect the upper and lower ends of the pressure sensor 9 through 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 threaded lower pressure plate 7 and the short section of the steel bar 6-2 The upper end contact settings;

The servo actuator 19 is fixedly supported above the pressure detection mechanism, and its telescopic end is set downward, and is fixedly connected with the upper end surface of the threaded upper pressure plate 8;

The thin steel sheet A10 is arranged horizontally, one end of which is adhered to the side of the threaded lower pressing plate 7, and the other end extends to the outside of the reinforced concrete sample 6;

The base of the universal support frame 11 is fixedly connected to the upper end surface of the base top plate 1-1, the electronic dial indicator 12 is installed on the upper part of the universal support frame 11, and the lower end of the measuring rod is connected to the upper end of the thin steel sheet A10. face-to-face contact;

The computer 14 is respectively connected with the electronic dial indicator 12 and the pressure sensor 9 through the signal processor 13 , and is also connected with the servo actuator 19 . As a preference, the computer 14 is arranged on the table 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 the test data, can accurately test the bearing capacity of the reinforced concrete, and can provide a theoretical basis for engineering design and construction.

In order to facilitate the pulling test, the structure top plate 2 is also included. The structural top plate 2 is arranged above the structure base 1, and a circular slot A2-1 is opened in the center of the structure top plate. A U-shaped slot a2-2, the circular slot A2-1 is set corresponding to the circular slot B1-1-1, a plurality of U-shaped slot a2-2 and a plurality of U-shaped slot b1-1 -2 corresponds to the setting.

In order to record data synchronously in real time during the pull-out test, it also includes reinforced concrete sample 6, pressure sensor 9, perforated lower pressure plate 16, perforated upper pressure plate 17, servo actuator 19, thin steel sheet B18, universal support frame 11. Electronic dial indicator 12, signal processor 13 and computer 14;

The part of the vertical support 1-6 corresponding to the circular slot B1-1-1 is a hollow structure;

The reinforced concrete sample 6 is a reinforced concrete sample to be tested, which is in the shape of a cube, with steel bars embedded in the middle, and the steel bars extend to the outside of the opposite end faces of the reinforced concrete sample 6, and are outside one side of the reinforced concrete sample 6. A short section of steel bar 6-2 is exposed, and a long section of steel bar 6-1 is exposed on the other side of the reinforced concrete sample 6; There is a gap between the lower end of the steel bar section 6-2 and the upper end surface of the base top plate 1-1, and the upper end of the long section steel bar 6-1 is pierced through the circular slot A2-1 to the top of the structural top plate 2;

The pressure sensor 9 is a hollow load cell; the center of the perforated upper pressure plate 17 and the perforated lower pressure plate 16 are provided with through holes, and are respectively coaxially arranged on the upper and lower ends of the pressure sensor 9, forming a The pressure detection mechanism of the hollow cavity; the pressure detection mechanism is arranged between the reinforced concrete sample 6 and the structural roof 2, and the cavity is sleeved on the outside of the long steel bar 6-1 through it;

The servo actuator 19 is fixedly supported above the structural top plate 2, and its telescopic end is set downward, and is fixedly connected to the upper end of the long steel bar 6-1;

The thin steel sheet B18 is arranged horizontally, one end of which is adhered to the end face of the short-section steel bar 6-2 of the reinforced concrete sample 6, and the other end extends horizontally to the outside of the reinforced concrete sample 6;

The base of the universal support frame 11 is fixedly connected to the upper end surface of the base top plate 1-1, the electronic dial indicator 12 is installed on the upper part of the universal support frame 11, and the lower end of the measuring rod is connected to the upper end of the thin steel sheet B18. face-to-face contact;

The computer 14 is respectively connected with the electronic dial indicator 12 and the pressure sensor 9 through the signal processor 13 , and is also connected with the servo actuator 19 . As a preference, the computer 14 is arranged on the table 15 .

The invention has the advantages of simple structure and low manufacturing cost, can conveniently carry out the pulling test of the reinforced concrete sample, can conveniently record the test data, can accurately test the bearing capacity of the reinforced concrete, and can provide a theoretical basis for engineering design and construction.

In order to facilitate the assembly of the test device, and also to facilitate the disassembly of the test device, the upper connector 3 consists of the upper connector screw 3-1 and a plurality of upper parts connected to the upper and lower ends of the upper connector screw 3-1 respectively. The connecting piece nut 3-2 is composed of 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 connector 4 consists of a lower connector bolt 4-1, a plurality of lower connector nuts 4-2 connected to the lower part of the lower connector bolt 4-1, and a plurality of lower parts respectively sleeved on the lower part of the lower connector bolt 4-1 The connector gasket is composed of 4-3.

Preferably, the base top plate 1-1 and the base bottom plate 1-2 are square, and the number of U-shaped slot holes b1-1-2 is four, which are respectively arranged in the middle of the four sides of the base top plate 1-1.

The invention also provides a test method for testing the bond strength of reinforced concrete, which utilizes a test device for testing the bond strength of reinforced concrete to carry out a push-out test, which specifically includes the following steps:

Step 1: Fix the structure base 1;

The structural base 1 is fixedly connected to the test platform base 5 through the lower connector 4;

Step 2: Place the reinforced concrete sample 6;

Pass the long steel bar 6-1 of the reinforced concrete sample 6 through the circular slot B1-1-1 of the base top plate 1-1 and place it on the base top plate 1-1;

Step 3: Place the pressure sensor 9;

The threaded lower pressure plate 7 and the threaded upper pressure plate 8 are respectively connected with the upper and lower ends of the inner cavity of the pressure sensor 9 by means of screw fitting to form a pressure detection mechanism, and the threaded upper pressure plate 8 and the fixed support in the pressure detection mechanism are arranged above the pressure detection mechanism. The servo actuator 19 is connected, and the servo actuator 19 is adjusted by the computer 14 so that the lower end face of the threaded lower pressing plate 7 is in contact with the upper end of the short-section steel bar 6-2 of the reinforced concrete sample 6;

Step 4: Place the electronic dial indicator 12;

Set the thin steel sheet A10 horizontally, and make one end of it and the side of the threaded lower pressure plate 7 bonded by structural adhesive; combine the electronic dial indicator 12 with the universal support frame 11, and place the universal support frame 11 on the base The upper end face of the top plate 1-1 makes the lower end of the measuring rod of the electronic dial indicator 12 contact with the upper end face of the thin steel sheet A10;

Step 5: establish a connection through the signal processor 13;

Connect the pressure sensor 9 and the electronic dial indicator 12 to the signal processor 12 through wires, and connect the signal processor 12 and the servo actuator 19 to the computer 14 through wires;

Step 6: Carry out push-out loading implementation;

The servo actuator 19 is controlled by the computer 14 to exert downward pressure, and the pressure is gradually increased to drive the pressure detection mechanism to press down the upper end of the short-section steel bar 6-2, and the computer 14 records the pressure value collected by the pressure sensor 9 in real time and the electronic Sub-table 12 readings.

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 requirements for the bond strength of reinforced concrete, so that the bearing capacity of reinforced concrete can be accurately tested, and the theoretical basis for engineering design and construction can be provided.

The invention also provides a test method for testing the bond strength of reinforced concrete, which utilizes a test device for testing the bond strength of reinforced concrete to perform a pull-out test, which specifically includes the following steps:

Step 1: Fix the structure base 1;

The structural base 1 is fixedly connected to the test platform base 5 through the lower connector 4;

Step 2: Place reinforced concrete sample 6;

The setting of the short section steel bar 6-2 of the reinforced concrete sample 6 towards the base top plate 1-1; the perforated lower pressure plate 16 is placed on the surface of the concrete sample 6 through the long section steel bar 6-1 of the reinforced concrete sample 6, The pressure sensor 9 is placed on the perforated lower pressure plate 16 through the long section of steel bar 6-1 of the reinforced concrete sample 6; superior;

Step 3: Assemble the structural top plate 2, and arrange the servo actuator 19;

The structural roof 2 is passed through the long section of steel bar 6-1 of the reinforced concrete sample 6, and the connection between the structural roof 2 and the structural base 1 is established through the upper connector 3, and the upper end surface of the structural roof 2 and the perforated upper pressure plate 17 is left. There is a certain distance; the servo actuator 19 is fixedly supported above the structural top plate 2, and the servo actuator 19 is fixedly connected with the upper end of the long steel bar 6-1, and the servo actuator 19 is controlled by the computer 14 to retract. A certain distance, so that the perforated upper pressure plate 17 is closely attached to the structural roof 2, and at the same time ensure that the end face of the short section of the steel bar 6-2 of the reinforced concrete sample 6 has a certain distance from the upper end face of the base roof 1-1;

Step 4: Place the electronic dial indicator 12;

Set the thin steel sheet B18 horizontally, and bond one end of the steel sheet B18 with the end face of the short section of steel bar 6-2 of the reinforced concrete sample 6 through structural glue; combine the electronic dial indicator 12 with the universal support frame 11, The universal support frame 11 is placed on the upper end face of the base top plate 1-1, so that the lower end of the measuring rod of the electronic dial indicator 12 is in contact with the upper end face of the thin steel sheet A10;

Step 5: establish a connection through the signal processor 13;

Connect the pressure sensor 9 and the electronic dial indicator 12 to the signal processor 12 through wires, and connect the signal processor 12 and the servo actuator 19 to the computer 14 through wires;

Step 6: Carry out pulling and loading;

The computer 14 controls the servo actuator 19 to pull up the long steel bar 6-1, and gradually increases the tension. The computer 14 records the tension 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 can conveniently realize the push-out test of the reinforced concrete sample. The invention can effectively meet the test requirements for the bond strength of reinforced concrete, so that the bearing capacity of reinforced concrete can be accurately tested, and the theoretical basis for engineering design and construction can be provided.

Claims (9)

1. a test device for testing reinforced concrete bond strength, comprising a structural base (1), characterized in that, also comprising an upper connector (3) and a lower connector (4); The vertical extension of the structural base (1) includes a vertical support member (1-6), a base top plate (1-1) fixedly connected to the top of the vertical support member (1-6), and a base top plate (1-1) fixedly connected to the vertical support member (1-6). A base bottom plate (1-2) towards the bottom of the support member (1-6); the vertical support member (1-6) includes two oppositely arranged middle long rib plates (1-4), two oppositely arranged middle long rib plates (1-4) The short middle rib (1-3) and the two pairs of outer ribs (1-5) located on the outside of the two long middle ribs (1-4) respectively, the two short middle ribs (1-3) are fixedly connected to each other. Between the two middle long rib plates (1-4), two pairs of outer rib plates (1-5) are fixedly connected to the outer sides of the two middle long rib plates (1-4) respectively; the base top plate (1-1) ) A circular slot hole B (1-1-1) is opened in the center, and a plurality of U-shaped slot holes b (1-1-2) are evenly opened on the part of its edge in the circumferential direction; the base bottom plate (1-2 ) A plurality of circular slot holes C (1-2-1) are evenly opened in the circumferential direction of the part close to the edge; The number of the lower connector (4) is multiple, and the number is consistent with the number of the circular slot C (1-2-1); the upper end of the lower connector (4) is inserted into the circular slot C (1-2-1); The number of the upper connector (3) is multiple, and the number is consistent with the number of the U-shaped slot b (1-1-2), and the lower end of the upper connector (3) is inserted into the U-shaped slot b. (1-1-2). 2. a kind of test device for testing reinforced concrete bond strength according to claim 1, is characterized in that, also comprises test platform base (5), and described test platform base (5) is arranged on structure base (1 ), the test platform base (5) is provided with a plurality of circular through holes, and the plurality of circular The lower ends of the lower connecting pieces (4) are respectively inserted into the plurality of circular through holes, and the test platform base (5) is fixedly connected with the base bottom plate (1-2). 3. a kind of test device for testing reinforced concrete bond strength according to claim 2, is characterized in that, also comprises reinforced concrete sample (6), pressure sensor (9), threaded upper pressure plate (8), Threaded pressing plate (7), servo actuator (19), thin steel sheet A (10), universal support frame (11), electronic dial indicator (12), signal processor (13) and computer (14) ; The part of the vertical support (1-6) corresponding to the circular slot B (1-1-1) is a hollow structure; The reinforced concrete sample (6) is a reinforced concrete sample to be tested, and it is in the shape of a cube, wherein steel bars are embedded in the middle, and the steel bars extend to the outside of the opposite end faces of the reinforced concrete sample (6), and are in the reinforced concrete sample (6). 6) There is a short section of steel bar (6-2) exposed on the outside of one side, and a long section of steel bar (6-1) is exposed on the other side of the reinforced concrete sample (6); the reinforced concrete sample (6) is set in Above the top plate of the base (1-1), and the long section of steel bars (6-1) protrudes into the cavity of the vertical support (1-6) through the circular slot B (1-1-1); The pressure sensor (9) is a hollow type load cell, and the upper end and the lower end of the inner cavity of the pressure sensor (9) are provided with internal thread structures; the lower end of the thread upper pressure plate (8) and the thread lower pressure plate (7) The upper ends are fixedly connected with studs, and the upper and lower ends of the pressure sensor (9) are connected by the studs to form a pressure detection mechanism; the pressure detection mechanism is arranged above the reinforced concrete sample (6), and the threaded lower pressure plate ( 7) The setting where the lower end face of the short section of steel bars (6-2) is in contact with the upper end; The servo actuator (19) is fixedly supported above the pressure detection mechanism, and its telescopic end is set downward, and is fixedly connected with the upper end face of the threaded upper pressure plate (8); The thin steel sheet A (10) is arranged horizontally, one end of which is adhered to the side surface of the threaded lower pressing plate (7), and the other end extends to the outside of the reinforced concrete sample (6); The base of the universal support frame (11) is fixedly connected to the upper end surface of the base top plate (1-1), the electronic dial indicator (12) is installed on the upper part of the universal support frame (11), and its measuring rod The lower end is in contact with the upper end face of the thin steel sheet A (10); The computer (14) is respectively connected with the electronic dial indicator (12) and the pressure sensor (9) through the signal processor (13), and is also connected with the servo actuator (19). 4. a kind of test device for testing reinforced concrete bond strength according to claim 2, is characterized in that, also comprises structure top plate (2), described structure top plate (2) is arranged on the structure base (1) Above, and its center is provided with a circular slot A (2-1), and a part of its edge is evenly provided with a plurality of U-shaped slots a (2-2) in the circumferential direction, and the circular slot A (2-1) ) The setting corresponding to the circular slot B (1-1-1), the setting corresponding to the multiple U-shaped slot holes a (2-2) and the multiple U-shaped slot holes b (1-1-2) . 5. A kind of test device for testing reinforced concrete bond strength according to claim 4, is characterized in that, also comprises reinforced concrete sample (6), pressure sensor (9), perforated lower pressure plate (16), Perforated upper platen (17), servo actuator (19), thin steel sheet B (18), universal support frame (11), electronic dial indicator (12), signal processor (13) and computer (14) ; The part of the vertical support (1-6) corresponding to the circular slot B (1-1-1) is a hollow structure; The reinforced concrete sample (6) is a reinforced concrete sample to be tested, and it is in the shape of a cube, wherein steel bars are embedded in the middle, and the steel bars extend to the outside of the opposite end faces of the reinforced concrete sample (6), and are in the reinforced concrete sample (6). 6) There is a short section of steel bar (6-2) exposed on the outside of one side, and a long section of steel bar (6-1) is exposed on the other side of the reinforced concrete sample (6); the reinforced concrete sample (6) is set in Between the base top plate (1-1) and the structural top plate (2), and there is a gap between the lower end of the short section of reinforcement (6-2) and the upper end face of the base top plate (1-1), the long section of reinforcement (6- The upper end of 1) is protruded from the circular slot A (2-1) to the top of the structural top plate (2); The pressure sensor (9) is a hollow load cell; the center of the perforated upper pressure plate (17) and the perforated lower pressure plate (16) are provided with through holes, and are respectively coaxially arranged on the pressure sensor (9) The upper and lower ends of the reinforced concrete 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 the cavity is sleeved on the long section of the steel bar (2). 6-1) outside; The servo actuator (19) is fixedly supported above the structural top plate (2), and the telescopic end thereof is arranged downward, and is fixedly connected with the upper end of the long-section steel bar (6-1); The thin steel sheet B (18) is arranged horizontally, one end of the thin steel sheet B (18) is adhered to the end face of the short section of the steel bar (6-2) of the reinforced concrete sample (6), and the other end extends horizontally to the reinforced concrete sample (6). ) outside; The base of the universal support frame (11) is fixedly connected to the upper end surface of the base top plate (1-1), the electronic dial indicator (12) is installed on the upper part of the universal support frame (11), and its measuring rod The lower end is in contact with the upper end face of the thin steel sheet B (18); The computer (14) is respectively connected with the electronic dial indicator (12) and the pressure sensor (9) through the signal processor (13), and is also connected with the servo actuator (19). 6. A test device for testing reinforced concrete bond strength according to claim 3 or 5, characterized in that, the upper connector (3) is connected by the upper connector screw (3-1), respectively A plurality of upper connecting member nuts (3-2) on the upper and lower ends of the upper connecting member screw rod (3-1) and a plurality of upper connecting member gaskets (3) respectively sleeved on the upper and lower ends of the upper connecting member screw rod (3-1) -3) Composition; The lower connector (4) consists of lower connector bolts (4-1), a plurality of lower connector nuts (4-2) connected to the lower part of the lower connector bolts (4-1), and bolts respectively sleeved on the lower connector (4-1) The lower part is composed of a plurality of lower connecting piece gaskets (4-3). 7. A test device for testing reinforced concrete bond strength according to claim 3 or 5, wherein the base top plate (1-1) and the base bottom plate (1-2) are all square, The number of U-shaped slot holes b (1-1-2) is four, and they are respectively arranged in the middle of the four sides of the base top plate (1-1). 8. a test method for testing reinforced concrete bond strength, is characterized in that, utilizes a kind of test device for testing reinforced concrete bond strength as claimed in claim 3 to carry out push-out test, specifically comprises the following steps: Step 1: Fix the structural base (1); The structural base (1) is fixedly connected to the test platform base (5) through the lower connector (4); Step 2: place the reinforced concrete sample (6); Pass the long steel bar (6-1) of the reinforced concrete sample (6) through the circular slot B (1-1-1) of the base top plate (1-1) and place it on the base top plate (1-1) ; Step 3: Place the pressure sensor (9); The threaded lower pressure plate (7) and the threaded upper pressure plate (8) are respectively connected to the upper and lower ends of the inner cavity of the pressure sensor (9) by means of thread fitting to form a pressure detection mechanism, and the threaded upper pressure plate (8) in the pressure detection mechanism is connected to the pressure detection mechanism. The servo actuator (19) fixedly supported above the pressure detection mechanism is connected, and the servo actuator (19) is adjusted through the computer (14) so that the lower end face of the threaded lower pressing plate (7) is connected to the reinforced concrete sample (6). The upper ends of the short-segment reinforcement bars (6-2) are in contact with each other; Step 4: Place the electronic dial indicator (12); Set the thin steel sheet A (10) horizontally, and bond one end of it with the side surface of the threaded lower pressure plate (7) through structural adhesive; combine the electronic dial indicator (12) with the universal support frame (11), and Place the universal support frame (11) on the upper end face of the base top plate (1-1), so that the lower end of the measuring rod of the electronic dial indicator (12) is in contact with the upper end face of the thin steel sheet A (10); Step 5: establish a connection through the signal processor (13); Connect the pressure sensor (9) and the electronic dial indicator (12) with the signal processor (12) through wires, and connect the signal processor (12) and the servo actuator (19) with the computer (14) through wires; Step 6: Carry out push-out loading implementation; The servo actuator (19) is controlled by the computer (14) to exert downward pressure, and the pressure is gradually increased, and the pressure detection mechanism is driven to press down the upper end of the short-section steel bar (6-2), and the pressure sensor (6-2) is recorded in real time through the computer (14). 9) The collected pressure value and the reading of the electronic dial indicator (12). 9. a test method for testing reinforced concrete bond strength, is characterized in that, utilizes a kind of test device for testing reinforced concrete bond strength as claimed in claim 5 to carry out pull-out test, specifically comprises the following steps : Step 1: Fix the structural base (1); The structural base (1) is fixedly connected to the test platform base (5) through the lower connector (4); Step 2: place the reinforced concrete sample (6); Setting the short section of reinforcement (6-2) of the reinforced concrete sample (6) towards the base top plate (1-1); passing the perforated lower pressure plate (16) through the long section of reinforcement (6) of the reinforced concrete sample (6) -1) Place on the surface of the concrete sample (6), place the pressure sensor (9) through the long section of steel bars (6-1) of the reinforced concrete sample (6) on the perforated lower pressure plate (16); The upper pressure plate (17) is placed on the pressure sensor (9) through the long section of steel bars (6-1) of the reinforced concrete sample (6); Step 3: assembling the structural top plate (2), and arranging the servo actuator (19); Pass the structural roof (2) through the long section of steel bars (6-1) of the reinforced concrete sample (6), and establish the connection between the structural roof (2) and the structural base (1) through the upper connector (3), and make the A certain distance is left between the structural top plate (2) and the upper end face of the perforated upper pressing plate (17); a servo actuator (19) is fixedly supported above the structural top plate (2), and the servo actuator (19) is connected to the long The upper end of the steel bar (6-1) is fixedly connected, and the servo actuator (19) is controlled by the computer (14) to retract a certain distance, so that the perforated upper pressure plate (17) is close to the structural top plate (2), while ensuring that the steel bar The end face of the short-section steel bar (6-2) of the concrete sample (6) is at a certain distance from the upper end face of the base top plate (1-1); Step 4: Place the electronic dial indicator (12); Set the thin steel sheet B (18) horizontally, and bond one end of the steel sheet B (18) with the end face of the short section of the steel bar (6-2) of the reinforced concrete sample (6) through structural adhesive; connect the electronic dial indicator (12) with Assemble the universal support frame (11), and place the universal support frame (11) on the upper end surface of the base top plate (1-1), so that the lower end of the measuring rod of the electronic dial indicator (12) is connected to the thin steel sheet A (10). ) are in contact with the upper end face; Step 5: establish a connection through the signal processor (13); Connect the pressure sensor (9) and the electronic dial indicator (12) with the signal processor (12) through wires, and connect the signal processor (12) and the servo actuator (19) with the computer (14) through wires; Step 6: Carry out pulling and loading realization; The computer (14) controls the servo actuator (19) to pull up the long steel bar (6-1), and gradually increases the tension, and the computer (14) records the tension value collected by the pressure sensor (9) in real time and the electronic Dial indicator (12) reading.

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