CN103149092B - Drawing device split by multifunctional concrete test specimen - Google Patents

Abstract

A multi-functional concrete specimen splitting and pulling device, comprising a frame, a lower pressing plate is arranged under the frame, an upper pressing plate which can move vertically is arranged above the frame, an upper pressing plate surface is arranged on the lower end surface of the upper pressing plate, and an upper pressing plate is arranged on the upper end surface of the lower pressing plate. There is a lower pressing plate surface, and the upper pressing plate surface (and the lower pressing plate surface are in line contact with the test piece between the upper pressing plate surface and the lower pressing plate surface; there is also a slidable device in the frame for clamping the test piece. The movable baffle of the piece. The present invention can be applied to a variety of test pieces of different specifications by arranging the movable upper platen. The set movable baffle can easily fix the test piece, and cooperate with the scale to easily realize the centering. The present invention It can accurately center and split concrete specimens of various sizes. The whole device has a simple structure, small volume, can be moved freely, and can be reused many times. The loading control is convenient and flexible, and the measured data is more in line with the actual situation. Requirements for splitting test procedures.

Description

Multifunctional Concrete Specimen Splitting and Pulling Device

technical field

The invention relates to the field of test devices for concrete mechanical properties, in particular to a multifunctional concrete test piece splitting and pulling device.

Background technique

Tensile strength is an important mechanical parameter of concrete. At present, the test methods for determining the tensile strength of concrete include axial tension method, concrete beam bending test method and split tension test method. According to relevant data, the strength measured by the axial tension method is most in line with the actual situation, but this method has difficulties in centering; while the strength measured by the concrete beam bending test method is often much higher than the actual strength, so it is widely used in China. In addition, cube or cylinder splitting test is often used to measure the tensile strength of concrete. Apply a pressure line load on the cube or cylinder, so that the vertical interface in the middle of the specimen distributes the horizontal tensile stress evenly except for a small range near the applied point. When the tensile stress reached the tensile strength of the concrete, the specimen was split in half. However, the concentrated line load on the specimen is difficult to apply, and the centering is also difficult, which is not conducive to the study of the tensile strength of concrete.

Chinese patent: 201020619738.3 discloses a concrete splitting tensile test auxiliary device, through which an "L"-shaped baffle is arranged on the opposite corners of the pressing plate, and a gasket is arranged on the center line of the pressing plate. Adopting the integrated design of the spacer and the pressure plate that meet the design requirements, and the baffle plate is fixed on the pressure plate for positioning the specimen. The error of human factors when marking the line improves the test efficiency. Because the upper and lower pressure plates adopt independent structures without connection between them, the volume is smaller and the weight is lighter than the existing cube splitting test device. The problem is that the device can only be used for test pieces of fixed size, and when it involves test pieces of various specifications and sizes, it is necessary to make pressure plates of various sizes, which is expensive and inconvenient.

Contents of the invention

The technical problem to be solved by the present invention is to provide a multifunctional concrete specimen splitting device, which can be conveniently applied to various specimens of different specifications, and improves the working efficiency of the test and the accuracy of the test results.

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: a multi-functional concrete test piece splitting device, including a frame, which is characterized in that: a lower pressing plate is provided under the frame, and a vertically movable upper plate is provided above the frame. Pressing plate, the lower end surface of the upper pressing plate is provided with an upper pressing plate surface, the upper end surface of the lower pressing plate is provided with a lower pressing plate surface, and the upper pressing plate surface and the lower pressing plate surface are in line contact with the test piece located between the upper pressing plate surface and the lower pressing plate surface ;

In the frame, the side plates are connected by a plurality of connecting rods and connecting guide rods, the movable baffle is slidably matched with the connecting rods and the connecting guide rods, the lower end of the side plates is fixedly connected with the base plate, and the lower pressure plate is connected with the base plate;

A chute is provided on the top of the side plate, and the chute is slidingly matched with the end of the upper pressing plate of the upper pressing plate; a movable baffle that can slide for clamping the test piece is also relatively provided in the frame;

The movable baffle is also provided with a bolt connection hole for connecting with the threaded rod bearing. The threaded rod and the threaded hole on the side plate form a threaded fit. Connection method for axial movement.

The cross sections of the upper pressing plate surface and the lower pressing plate surface are arc-shaped, V-shaped or U-shaped.

Both ends of the lower pressing plate are provided with ends of the lower pressing plate, and the ends of the lower pressing plate cooperate with the notches at the lower ends of the side plates.

The movable baffle is provided with a plurality of sliding holes for sliding cooperation with the connecting rod, and the movable baffle notch is provided at the lower end of the movable baffle to avoid interference with the lower pressing plate surface.

The end of the upper platen is provided with two sidewalls that form a sliding fit with the chute.

The frame is provided with scales for centering along the length or/and width direction.

A multifunctional splitting device for concrete specimens provided by the present invention can be applied to various specimens of different specifications by setting a movable upper platen, and the set movable baffles can conveniently fix the specimens. achieve alignment. The invention can accurately split and pull concrete specimens of various sizes. The whole device has a simple structure, a small volume, can move freely, and can be used repeatedly. The loading control is convenient and flexible, and the measured data is more in line with the actual situation. , meeting the requirements of the splitting test regulations.

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 three-dimensional structure of the present invention.

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

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

Fig. 4 is a schematic side view of the structure of the present invention.

Fig. 5 is a schematic structural view of the movable baffle in the present invention.

Fig. 6 is a schematic structural view of the threaded rod bearing in the present invention.

In the figure: base plate 1, lower pressing plate 2, upper pressing plate 3, movable baffle plate 4, side plate 5, threaded rod 6, connecting rod 7, connecting guide rod 8, upper pressing plate end 9, chute 10, upper pressing plate surface 11 , Lower pressure plate surface 12, lower pressure plate end 13, movable baffle notch 14, sliding hole 15, bolt connection hole 16, threaded hole 17, side wall 18.

detailed description

Example 1:

As shown in Fig. 1-5, a multifunctional concrete specimen splitting and pulling device includes a frame, a lower pressing plate 2 is arranged under the frame, an upper pressing plate 3 which can move vertically is arranged above the frame, and a lower end surface of the upper pressing plate 3 is provided with The upper platen surface 11, the upper end surface of the lower platen 2 is provided with the lower platen surface 12, the upper platen surface 11 and the lower platen surface 12 are in line contact with the test piece between the upper platen surface 11 and the lower platen surface 12; optimization In the scheme, the cross-sections of the upper pressing plate surface 11 and the lower pressing plate surface 12 are arc-shaped, V-shaped or U-shaped. As shown in Figures 1 and 4, the arc used in this example.

As shown in Figures 1-3, a movable baffle 4 that is slidable and used to clamp the test piece is relatively provided in the frame.

The frame is a rectangular frame with windows for observation and operation, which is not shown in the figure. With reference to Fig. 1, shown in Figure 2, lower pressing plate 2 is fixed on the bottom of frame, and upper pressing plate 3 is connected with the chute on the frame side plate by upper pressing plate end 9. With this structure, when pressure is applied to the upper pressing plate 3, a pressure line load can be applied to the test piece.

As shown in Fig. 2, the movable baffle 4 is connected with the threaded rod 6 through the bearing, and the threaded rod 6 forms a threaded fit with the threaded hole 17 on the side plate.

The frame is provided with scales for centering along the length or/and width direction.

Example 2:

On the basis of Embodiment 1, the frame part is further optimized.

As shown in Figure 1-4, in the frame described, the side plates 5 are connected by a plurality of connecting rods 7, as shown in Figure 1-3, the two ends of the two connecting rods 7 at the bottom are fixed to the side plates 5 connection, the two ends of the upper part and four connecting guide rods 8 are fixedly connected with the side plate 5, and the lower ends of the side plate 5 are fixedly connected with the base plate 1, thereby forming a stable frame. The lower pressing plate 2 is connected with the base plate 1 .

As shown in Fig. 1, the upper end of the side plate 5 is provided with a chute 10, and the chute 10 is slidably matched with the upper platen end 9 of the upper platen 3; The groove 10 forms the side walls for a sliding fit. With this structure, the sliding precision of the upper pressing plate 3 is improved, and the centering precision during the experiment is ensured.

As shown in Figure 5, the movable baffle 4 is also provided with a bolt connection hole 16 for bearing connection with the threaded rod 6, so that the threaded rod 6 and the movable baffle 4 are rotatable and cannot be threaded with each other. The connection mode that rod 6 moves axially. It should be noted that the rotation here can be a rolling bearing or a sliding bearing, and the bearing can be arranged in the bolt connection hole 16, or at the end of the threaded rod 6, as shown in Figure 6, the The bearing is located at the end of the threaded rod 6. The structure described here can also be used in Example 1.

The threaded rod 6 forms a threaded fit with the threaded hole 17 on the side plate, and a handle or a butterfly piece is usually provided at the outer end of the threaded rod 6 . With this structure, the threaded rod 6 is rotated, and under the action of the threaded hole 17 on the side plate, the threaded rod 6 promptly promotes the movable baffle 4 to move, and due to the existence of the bearing, the movable baffle 4 can not rotate with the threaded rod 6 .

As shown in Figures 1 and 4, the two ends of the lower pressing plate 2 are provided with lower pressing plate ends 13, and the lower pressing plate ends 13 are matched with the notch at the lower end of the side plate 5. With this structure, the centering accuracy of the lower platen 2 is further ensured.

As shown in FIG. 5 , the movable baffle 4 is provided with a plurality of sliding holes 15 for slidingly fitting with the connecting rod 7 , and the lower end of the movable baffle 4 is provided with a movable baffle notch 14 to avoid interference with the lower pressing plate surface 12 . With this structure, it is ensured that the sliding of the movable baffle 4 is smoother, and during the sliding process, it will not be affected by the rotation of the threaded rod 6 .

The frame is provided with scales for centering along the length or/and width direction, which are not shown in the figure. This structure facilitates the centering of the test piece.

The device of the present invention is not only applicable to cube specimens of different sizes, but also to standard cylinder specimens in the American code. When it is necessary to split and pull the cube specimen, the lower pressing plate 2 is placed on the base plate 1, the end 13 of the lower pressing plate is positioned through the side plate 5, the connecting rod 7 passes through the corresponding holes on the side plate 5 and the movable baffle plate 4, and the threaded rod is rotated 6. Fix the test piece in the middle of the lower platen 2 through the movable baffle plate 4, install the upper platen 3, and place the ends 9 of the upper platen 3 at both ends of the upper platen 3 in the chute 10 of the side plate 5. Put the whole test device on the universal testing press, and put it in the middle of the press through the scale control device on the frame; lower the beam of the press until the upper pressing plate 3 is pressed; remove the connecting rods 7 on both sides of the side plate 5 , start the press, and load it continuously and evenly until it breaks. When splitting and pulling a standard cylindrical specimen, it is only necessary to remove the movable baffle 4 in the middle, and the connecting rod 7 passes through two corresponding holes on the outside of the side plate 5, and the rest of the operations are the same as above.

Claims (5)

1. A multifunctional concrete specimen splitting device, including a frame, is characterized in that: a lower pressing plate (2) is provided under the frame, an upper pressing plate (3) that can move vertically is arranged above the frame, and the upper pressing plate (3) The lower end surface of the upper platen (11) is provided with the upper platen surface (12), and the upper end surface of the lower platen (2) is provided with the lower platen surface (12). 11) is in line contact with the test piece between the lower plate surface (12); In the above frame, the side plates (5) are connected by multiple connecting rods (7) and connecting guide rods (8), and the movable baffle (4) slides with the connecting rods (7) and connecting guide rods (8) Cooperate, the lower end of the side plate (5) is fixedly connected with the base plate (1), and the lower pressure plate (2) is connected with the base plate (1); The movable baffle (4) is provided with a plurality of sliding holes (15) for sliding fit with the connecting rod (7), and the lower end of the movable baffle (4) is provided with a movable baffle to avoid interference with the lower pressing plate surface (12) notch(14); The upper end of the side plate (5) is provided with a chute (10), and the chute (10) is slidably matched with the end (9) of the upper platen (3) of the upper platen; Movable baffle (4) for clamping the test piece; The movable baffle (4) is also provided with a bolt connection hole (16) for connecting with the threaded rod (6) bearing, and the threaded rod (6) forms a threaded fit with the threaded hole (17) on the side plate, and the threaded rod (6) ) and the movable baffle (4) form a connection that can rotate but cannot move axially along the threaded rod (6). 2. A multifunctional concrete specimen splitting device according to claim 1, characterized in that: the cross-sections of the upper pressing plate surface (11) and the lower pressing plate surface (12) are arc-shaped, V-shaped or U-shaped. 3. A multifunctional concrete specimen splitting device according to claim 1, characterized in that: the two ends of the lower pressing plate (2) are provided with lower pressing plate ends (13), and the lower pressing plate ends (13 ) fits with the notch at the lower end of the side plate (5). 4. A multifunctional concrete specimen splitting device according to claim 1, characterized in that: the end of the upper platen (9) is provided with two side walls that form a sliding fit with the chute (10) . 5. A multifunctional concrete specimen splitting device according to claim 1, characterized in that: said frame is provided with a scale for centering along the length or/and width direction.