CN102620982A - Concrete beam reverse loading test device - Google Patents

Abstract

A concrete beam reverse loading test device, including a base, chute is provided at both ends of the base, the support rod is installed in the chute through a nut; the support rod is connected with the support frame, and the two support frames are connected by a transverse The pull rod is connected; the base is provided with a support rod inside the chute, and the support rod is movably connected with the distribution beam; a jack and a force sensor are provided under the distribution beam. A concrete beam reverse loading test device provided by the present invention adopts the method of reverse loading, which is beneficial to observe the trend of cracks in the test piece and measure the width of cracks, so that it is easy to obtain test data, and adopts the support shaft to cooperate with the buckle The structure is conducive to loading the specimen. The cooperation of the chute arranged on the base, the transverse pull rod and the buckle structure can conveniently adjust the length to match the length of the test piece.

Description

Concrete beam reverse loading test device

technical field

The invention relates to the field of concrete load experiments, in particular to a concrete beam reverse loading test device which can complete damage experiments without unloading components under long-term loads.

Background technique

At present, experiments to study the influence of long-term constant loads on structures are basically carried out by loading heavy objects. During the damage test, they will be unloaded first and then loaded and damaged. This is different from the actual component that is damaged under continuous load. The loaded object has a large volume and covers a large area, and it is very inconvenient to move or adjust after loading, resulting in low experimental efficiency, and there will be a certain gap between the obtained results and the actual results, which is not conducive to the study of the general failure of components under long-term loads. law.

Chinese patent 201120125585.1 provides a stress static load test device for prefabricated beams. One end of multiple reaction force anchors is connected to the foundation body, and the other end is connected to the reaction force steel beam. There is a supporting device. The utility model provides a stress static load test device for prefabricated beams. By adopting the above structure, the stress static load test of prefabricated beams can be realized with less equipment, and a jack is used for stress loading, thereby eliminating the need for counterweights and lifting facilities. The problem with this device is that it is inconvenient to observe the trend of the cracks at the bottom of the beam and measure the width of the cracks, which is not conducive to the acquisition of experimental data.

Contents of the invention

The technical problem to be solved by the present invention is to provide a concrete beam reverse loading test device, which can conveniently obtain test data and facilitate loading of test pieces.

In order to solve the above technical problems, the technical solution adopted in the present invention is: a concrete beam reverse loading test device, including a base, the two ends of the base are provided with chutes, and the support rods are installed in the chutes through nuts;

The support rod is connected with the support frame, and the two support frames are connected by a transverse tie rod;

There is a support rod on the inside of the chute on the base, and the support rod is movably connected with the distribution beam;

There are jacks and force sensors under the distribution beam.

The support rod is connected with the lower end of the support frame through the support rotating shaft.

The rotating shaft of the support is locked by the fixed disk.

The transverse tie rod is connected with the support frame through a buckle.

The two ends of the transverse pull rod are connected with the buckle through threads.

A support groove is provided at the bottom of the distribution beam, and the support rod is movably located in the support groove.

A concrete beam reverse loading test device provided by the present invention adopts the method of reverse loading, which is beneficial to observe the trend of cracks in the test piece and measure the width of cracks, so that it is easy to obtain test data, and adopts the support shaft to cooperate with the buckle The structure is conducive to loading the specimen. The cooperation of the chute arranged on the base, the transverse pull rod and the buckle structure can conveniently adjust the length to match the length of the test piece.

The device of the present invention can carry out long-term static loading and simulated steel corrosion test research on concrete beams and similar beam members under the action of continuous load. Reuse, convenient and accurate loading control, and test data can be closer to reality; it can be used as an experimental device for teaching test beams in various schools, and can also be used for various performance testing tests of bending and shearing components in various scientific research institutions.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

Fig. 1 is a schematic diagram of the front view structure of the present invention.

Fig. 2 is a schematic side view of the structure of the present invention.

Fig. 3 is a schematic top view of the base of the present invention.

In the figure: base 1, chute 2, fixing hole 3, nut 4, reinforcement plate 5, support rod 6, support frame 7, support shaft 8, support rod 9, support groove 10, fixed plate 11, horizontal Pull rod 12, buckle ring 13, force sensor 14, jack 15, distribution beam 16, rolling support 17, fastening bolt 18, backing plate 19, test piece 20, fixed support 21.

Detailed ways

As shown in Fig. 1 and Fig. 3, a concrete beam reverse loading test device includes a base 1, a chute 2 is provided at both ends of the base 1, and a support rod 6 is installed in the chute 2 through a nut 4; the side view of the base 1 It becomes "Ω" shape, and the nut 4 below is located in the concave part of "Ω" shape. A reinforced backing plate 5 is also provided under the upper nut 4 to ensure that the support rod 6 is reliably stressed.

The support rod 6 is connected with the support frame 7, and the two support frames 7 are connected by a transverse tie rod 12;

As shown in Figure 1, a support rod 9 is provided on the inside of the chute 2 on the base 1, and the support rod 9 is connected to the fixing hole 3 on the base 1 through threads, so that the height of the support rod 9 can be adjusted to suit different test pieces 20 .

The support rod 9 is movably connected with the distribution beam 16 . In a preferred solution, a support groove 10 is provided at the bottom of the distribution beam 16 , and the support rod 9 is movably located in the support groove 10 . A jack 15 and a force sensor 14 are arranged under the distribution beam 16 . With this structure, when the jack 15 is lifted, the distribution beam 16 can move accordingly.

The distribution beam 16 is provided with a rolling support 17 and a fixed support 21 . A backing plate 19 is provided on the rolling support 17 and the fixed support 21 , and the test piece 20 is installed on the backing plate 19 , and a backing plate 19 is also provided between the support frame 7 and the test piece 20 .

As shown in Figure 1, the lower end of the support rod 6 and the support frame 7 is connected by a support shaft 8, wherein the support rod 6 is welded to the support shaft 8, and the lower end of the support frame 7 is connected to the support shaft 8 hinged. The support rotating shaft 8 is locked by the fixed disc 11 . With this structure, the support frame 7 can rotate to both sides, so as to facilitate loading the test piece 20 onto the support rotating shaft 8 , and then rotate to make the support frame 7 perpendicular to the test piece 20 after loading.

The transverse tie rod 12 is connected to the support frame 7 through a buckle 13 . Both ends of the transverse tie rod 12 are connected to the buckle 13 through threads. The structure of the buckle 13 is shown in Figure 1. From this structure, one is easy to separate from the buckle and the support frame 7, so as to facilitate loading of the test piece, and the other is to adjust the position of the buckle 13 and the transverse tie rod 12 through threads. At the same time, the support rod 6 is fastened at different positions of the chute 2 through the nut 4 to match the length of the transverse rod 12, thereby adapting to test pieces of different lengths.

When in use, the support rod 6 is installed in the chute 2 through the nut 4 and adjusted to a proper position according to the length of the test piece 20 .

A force sensor 14 is placed on the base 1 , and a jack 15 is placed above the force sensor 14 .

Install the support rod 9 to the fixing hole 3 of the base 1, adjust the height of the support rod 9 through the thread, and place the support groove 10 on the support rod 9. The support groove 10 in this example adopts a "U"-shaped support groove, and then distribute The beam 16 rests on the support groove 10 .

Place the test piece 20 on the support shaft 8 to ensure that the test piece is centered. Rotate to make the support frame 7 perpendicular to the test piece 20, install the fixed plate 11, lock the support shaft 8 with bolts, connect the support frame 7 through the buckle 13 on the transverse tie rod 12, tighten the fastening bolt 18 to fix the buckle 13. Specifically as shown in Figure 2.

Place the rolling bearing 17, the fixed bearing 21 and the backing plate 19 under the test piece according to the experimental requirements, and open the jack 15 to start the static loading experiment.

The device of the present invention uses the active force provided by the jack 15. On the one hand, the rolling support 17 and the fixed support 21 on the distribution beam 16 are transmitted to the test piece 22 as a loading force. To the pulling force, the reverse pulling force of the support frame 7 is transmitted to the base 1 through the support rotating shaft 8 and the support pull rod 6, and on the other hand, the force sensor 14 is used to directly act on the base 1, so that the device of the whole invention becomes an internal automatic Balanced state.

Claims (6)

1. the reverse load testing machine of beams of concrete comprises base (1), it is characterized in that: base (1) two ends are provided with chute (2), and bearing pull bar (6) is installed in the chute (2) through nut (4);

Bearing pull bar (6) is connected with support frame (7), connects through cross-tie (12) between two support frames (7);

Be positioned at chute (2) inboard on the base (1) and be provided with support bar (9), support bar (9) flexibly connects with distributing crossbeam (16);

Distribute crossbeam (16) to have lifting jack (15) and force transducer (14).

2. the reverse load testing machine of a kind of beams of concrete according to claim 1 is characterized in that: be connected through bearing rotating shaft (8) between the lower end of bearing pull bar (6) and support frame (7).

3. the reverse load testing machine of a kind of beams of concrete according to claim 2 is characterized in that: described bearing rotating shaft (8) is through shaft collar (11) locking.

4. the reverse load testing machine of a kind of beams of concrete according to claim 1 is characterized in that: cross-tie (12) is connected with support frame (7) through clasp (13).

5. the reverse load testing machine of a kind of beams of concrete according to claim 1 is characterized in that: cross-tie (12) two ends are connected with clasp (13) through screw thread.

6. the reverse load testing machine of a kind of beams of concrete according to claim 1 is characterized in that: distribute crossbeam (16) bottom to be provided with support slot (10), support bar (9) is positioned at support slot (10) versatilely.

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