Hydraulic engineering asphalt concrete tensile test clamp

Abstract

A hydraulic engineering asphalt concrete tensile test clamp comprises tensile heads, the left tensile head and the right tensile head are connected with a testing machine through connecting screws respectively, a limiting sliding groove is formed in each tensile head, and clamping pieces slide up and down along the limiting sliding grooves and are locked through positioning bolts; and the two clamping pieces are limited left and right by the limiting chutes and are fixed with the two ends of the sample through adhesive layers. The hydraulic asphalt concrete tensile test fixture provided by the utility model can prevent a sample from falling off or breaking, so that the test reliability is improved.

Description

Technical Field

[0001] The utility model relates to a clamp, in particular to a hydraulic asphalt concrete tensile test clamp. Background Art

[0002] The asphalt concrete tensile test is to determine the tensile strength and tensile strain of asphalt concrete and is applicable to asphalt concrete.

[0003] The asphalt concrete tensile test fixture configured by existing equipment manufacturers cannot meet the needs of actual work. The main deficiencies are as follows: (1) The bonding area is small and the bonding position is not firm on the top surface of the specimen, which makes it easy to pull off during the test. (2) It is easy to break near the end surface of the specimen, resulting in the scrapping of the specimen. (3) After the specimen is pulled off or scrapped, it is necessary to prepare the specimen again, which is time-consuming, labor-intensive and inefficient. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a hydraulic asphalt concrete tensile test fixture, which can effectively prevent the sample from being pulled off and broken, thereby ensuring the accuracy and reliability of the test, improving work efficiency, and having the advantages of simple operation, safety and reliability, etc.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A hydraulic asphalt concrete tensile test fixture comprises a tensile head, wherein the left and right tensile heads are respectively connected to a testing machine via connecting screws, each tensile head is provided with a limiting slide groove, a clamp slides up and down along the limiting slide groove and is locked via a positioning bolt; both clamps are limited left and right by the limiting slide groove and are fixed to both ends of the sample via an adhesive layer.

[0007] The stretching head comprises a bottom plate, side plates are arranged on the left and right of the bottom plate, and limiting parts are arranged at the ends of the two side plates opposite to each other, and the limiting parts are parallel to the bottom plate; the length of the opening formed between the two limiting parts is less than the length of the clip.

[0008] The clip is L-shaped.

[0009] The utility model provides a hydraulic asphalt concrete tensile test fixture, which has the following technical effects:

[0010] 1) By using L-shaped clips, the bonding area with the sample can be increased during bonding, ensuring a firm connection and avoiding falling off during the tensile test.

[0011] 2) The left and right L-shaped clips are placed diagonally to form a complete rectangular cavity, which greatly increases the force-bearing area during the test and can effectively prevent the end face of the specimen from breaking.

[0012] 3) By setting the stretching head as a concave structure, the sample can be quickly disassembled and assembled. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0014] Figure 1 It is the front view of the utility model.

[0015] Figure 2 It is a top view of the utility model.

[0016] Figure 3 It is a front cross-sectional view of the stretching head in the utility model.

[0017] Figure 4 It is the front view of the clip in the utility model.

[0018] Figure 5 for Figure 4 Cross-sectional view at AA in the middle.

[0019] In the figure: stretching head 1, clamping piece 2, connecting screw 3, positioning bolt 4, bottom plate 1.1, side plate 1.2, and limit part 1.3. DETAILED DESCRIPTION

[0020] like Figure 1-2 As shown, a hydraulic asphalt concrete tensile test fixture includes a tensile head 1, a clamp 2, a connecting screw 3 and a positioning bolt 4.

[0021] The stretching head 1 is made of 76mm×40mm×60mm steel material bent into a concave shape. The stretching head 1 includes a bottom plate 1.1. Side plates 1.2 are arranged on the left and right of the bottom plate 1.1. The ends of the two side plates 1.2 are relatively formed to form a limiting portion 1.3. The limiting portion 1.3 is parallel to the bottom plate 1.1. A connecting hole is opened in the middle of the bottom plate of the stretching head 1, and the connecting hole is threadedly connected to the connecting screw 3. A positioning bolt hole is correspondingly processed on each of the two side plates. A positioning bolt 4 is threadedly connected to the positioning bolt hole. The positioning bolt 4 is a standard part, and its function is to position the sample so that the sample is evenly stressed during the test, and at the same time clamp the sample to prevent the clamp 2 from being pulled off.

[0022] The clip 2 is made of angle steel or other steel materials into an L-shaped structure with an inner side length of 40mm×40mm and a width of 30mm. Two clips 2 are placed diagonally to form a complete rectangular cavity, which can more completely clamp the surroundings of the sample and greatly increase the force-bearing area during the test. It can effectively prevent pull-off and sample end face fracture.

[0023] The clip 2 cannot be in the shape of a Chinese character "Yu" or a Chinese character "U". Since the processing of the prism specimen is not completely standard, there will be errors in the processing size. In addition, the sample is very sensitive to temperature and will be partially deformed. Therefore, the Chinese character "Yu" or a Chinese character "U"-shaped clip 2 has four or three fixed bonding surfaces, and only two of them can be bonded, which cannot be completely bonded to the sample. After bonding, the bonding is not firm and it is also easy to fall off.

[0024] Working process and principle: Prepare a 40mm×40mm×220mm prism specimen according to standard requirements, and glue the clip 2 to the four sides of the two ends of the specimen with universal glue (AB glue), so that the upper top surface is flush with the end surface of the specimen, and wait for the glue to solidify before use. Use the connecting screw 3 to connect the tensile head 1 to the universal joint on the testing machine. Adjust the spacing between the upper and lower tensile heads 1, put in the specimen with the clip 2, adjust the positioning bolts 4 on the tensile head 1 up and down, so that the specimen is located in the middle of the tensile head 1, tighten the positioning bolts 4, and start the test.

Claims

1. A hydraulic asphalt concrete tensile test fixture, characterized by: It comprises a stretching head (1), wherein the left and right stretching heads (1) are respectively connected to the testing machine via a connecting screw (3), each stretching head (1) is provided with a limit slide groove, a clamping piece (2) slides up and down along the limit slide groove and is locked by a positioning bolt (4); both clamping pieces (2) are limited to the left and right by the limit slide groove and are fixed to the two ends of the sample by an adhesive layer.

2. A hydraulic asphalt concrete tensile test fixture according to claim 1, characterized in that: The stretching head (1) comprises a bottom plate (1.1), side plates (1.2) are arranged on the left and right of the bottom plate (1.1), and limiting portions (1.3) are arranged at the ends of the two side plates (1.2) relative to each other, the limiting portions (1.3) being parallel to the bottom plate (1.1); and the length of the opening formed between the two limiting portions (1.3) is less than the length of the clamping piece (2).

3. A hydraulic asphalt concrete tensile test fixture according to claim 1, characterized in that: The clip (2) is L-shaped.

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