Composite multilayer concrete member shear tester

Abstract

The utility model discloses a composite multilayer concrete member shear tester which comprises a first vertical frame, a second vertical frame, a fixing clamp, a jack and a loading platform, and a working area is formed between the first vertical frame and the second vertical frame; one end of the fixing clamp is adjustably positioned on the vertical frame I, and a positioning interval for positioning the upper part of the concrete member and a locking mechanism for limiting the displacement of the upper part of the concrete member during test are arranged in the fixing clamp; the jack is fixed to the first vertical frame and used for applying pressure to the concrete member. A pressure sensor for measuring the shear force of concrete is arranged on the front end surface of the jack; one end of the loading platform is fixed on the vertical frame I, and the other end of the loading platform is fixed on the vertical frame II; the loading platform is provided with a rolling shaft which enables the concrete member to move when the concrete member is pressed, and a displacement meter which measures the sliding distance of the concrete member. The utility model has the advantages of simple structure and accurate test data.

Description

Technical Field

[0001] The utility model belongs to the technical field of concrete component strength test equipment, in particular to a composite multi-layer concrete component shear tester. Background Art

[0002] Nowadays, concrete is still an essential material in the construction industry. A large number of projects use prefabricated rather than cast-in-place on non-load-bearing walls. The design experiment of prefabricated walls has also been included in the research plan of many scholars. Prefabricated walls use composite concrete technology, including EPS sandwich panels, XPS sandwich panels, etc. The bonding quality between the layers of these concrete wall panels will directly affect the overall structure and even the quality of the entire project. Most scholars mainly test the bending and shear properties of sandwich panels, and the shear test mainly uses double-sided shear. However, if there are connectors in the wall panel or the wall panel is small in size, it is difficult to measure the shear performance by double-sided shear test. At present, traditional multi-layer concrete structures mostly use double-sided shear tests, while most asymmetric structures or small-sized components use single-sided shear tests to measure the shear strength. However, due to the existence of bending moment, the single-sided shear test causes the problem that the whole is not pure shear, which often leads to inaccurate experimental data, resulting in the failure of the experiment. In order to be able to detect the interlayer bonding ability of double-layer concrete structures or concrete sandwich wall panels containing connectors and small sizes, this equipment is designed to measure the shear performance between the layers of concrete specimens. Summary of the invention

[0003] The utility model aims to provide a composite multi-layer concrete component shear tester for the above-mentioned deficiencies in the prior art, which has the characteristics of simple structure and accurate test data.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a composite multi-layer concrete component shear tester, which comprises

[0005] Stand 1 and Stand 2;

[0006] A working area is formed between the first stand and the second stand;

[0007] Fixing fixture;

[0008] One end of the fixing fixture is adjustably positioned on the stand 1, and has a positioning section for positioning the upper part of the concrete component, and a locking mechanism for limiting the displacement of the upper part of the concrete component during the test;

[0009] jack;

[0010] The jack is fixed on the first stand and is used to apply pressure to the concrete member; a pressure sensor for measuring the shear force of the concrete is provided on the front end surface of the jack;

[0011] Loading platform;

[0012] One end of the loading platform is fixed on the first frame, and the other end is fixed on the second frame; the loading platform is provided with a roller for allowing the concrete component to move when under pressure, and a displacement meter for measuring the sliding distance of the concrete component.

[0013] The fixing fixture includes a left baffle, a right baffle, a front baffle and a rear baffle. The bottoms of the left baffle and the right baffle are provided with adjustment holes, and the adjustment holes cooperate with the holes on the stand. The left baffle and the right baffle are provided with baffles extending to the side, and the bottoms of the front baffle and the rear baffle are in contact with the baffles and can be slid thereon. The sides of the left baffle and the right baffle are provided with through long holes, and the sides of the front baffle and the rear baffle are provided with locking holes, and the long holes and the locking holes are connected by bolts.

[0014] The rollers are made of stainless steel, and the spacing between the upper end surfaces of the rollers is less than 1 / 4 of the cross-sectional width of the concrete specimen.

[0015] The roller is covered with a crawler belt.

[0016] After adopting the above structure, the advantages of the utility model compared with the prior art are: the utility model has a simple structure and a reasonable design. The pressure is applied to the lower part of the concrete member by the jack, and the upper part can reduce the bending moment generated by the test through its own weight and the positioning of the fixing clamp, thereby solving the problem of unilateral horizontal shear during the shear test and making the data obtained from the test more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0018] The following description is only a preferred embodiment of the present invention, and does not limit the protection scope of the present invention. The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] For example, see Figure 1As shown: a composite multi-layer concrete component shear tester, which includes: a stand 10, a stand 2 11, a fixing fixture 20, a jack 30 and a loading platform 40; the stand 10 and the stand 2 11 have a certain distance, and a working area is formed therebetween. One end of the fixing fixture 20 is adjustably positioned on the stand 10, and there is a positioning area for positioning the upper part of the concrete component 12 inside, and a locking mechanism for limiting the displacement of the upper part of the concrete component 12 during the test; the fixing fixture 20 includes a left baffle 21, a right baffle 22, a front baffle 23 and a rear baffle 24, and the bottoms of the left baffle 21 and the right baffle 22 are both provided with an adjustment hole 25, and the adjustment hole 25 cooperates with the hole 13 on the stand 10, and the upper and lower positions of the fixing fixture 20 can be adjusted by moving the relative position of the adjustment hole 25 on the hole 13, and then locked by a bolt 27 to adapt to the test of concrete components 12 of different heights. The left baffle plate 21 and the right baffle plate 22 are provided with baffles extending to the side, and the bottoms of the front baffle plate 23 and the rear baffle plate 24 are in contact with the baffles and can be slid thereon; the sides of the left baffle plate 21 and the right baffle plate 22 are provided with through elongated holes 26, and the sides of the front baffle plate 23 and the rear baffle plate 24 are provided with locking holes, and the elongated holes 26 and the locking holes are connected by bolts 27; a locking mechanism is formed between the locking holes, the elongated holes 26 and the bolts 27, that is, in use, the front end of the concrete component 12 is abutted against the inner side of the front baffle plate 23, and the locking hole on the front baffle plate 23 is relative to the front end of the elongated holes 26 and then locked with the bolts 27, so that the screw side of the bolt 27 is in contact with the front inner side of the elongated holes 26. The front baffle 23 and the rear baffle 24 are both composed of two angle steels and a connecting piece 28. The two ends of the connecting piece 28 are respectively connected to the angle steels and fixed by bolts 27, so that the front baffle 23 and the rear baffle 24 form a semi-closed structure with one end closed and the other end open. When the two are positioned relative to each other, a positioning interval for positioning the upper part of the concrete component 12 is formed. The jack 30 adopts a 5T ordinary hydraulic jack, which is fixed on the stand 10 and is used to apply pressure to the lower part of the concrete component 12. The lower part of the concrete component 12 is separated from the upper part by the pressure of the jack 30. A pressure sensor 31 for measuring the shear force of the concrete is provided on the front end surface of the jack 30 to measure the applied shear force.One end of the loading platform 40 is fixed to the stand 10 by welding, and the other end thereof is fixed to the stand 2 11 by welding; a roller 41 for allowing the concrete member 12 to move when under pressure, and a displacement meter 42 for measuring the sliding distance of the concrete member 12 are arranged on the loading platform 40, the roller 41 is made of stainless steel, and the spacing between the upper end surfaces of the roller 41 is less than 1 / 4 of the cross-sectional width of the concrete specimen, and at the same time, the roller 41 is covered with a crawler 43; in use, the lower part of the concrete member 12 can move together with the crawler 43 through the pressure applied by the jack 30, and since the upper part of the concrete member 12 is fixed by the fixing fixture 20, its upper part and the lower part will be separated, and then the displacement distance of the lower part of the concrete member 12 is measured by the displacement meter 42, and the shear resistance of the concrete member 12 can be measured by calculation.

Claims

1. A composite multi-layer concrete component shear tester, characterized in that: include Stand 1 (10) and Stand 2 (11); A working area is formed between the stand 1 (10) and the stand 2 (11); Fixing fixture (20); One end of the fixing fixture (20) is adjustably positioned on the stand (10), and has a positioning section inside for positioning the upper part of the concrete component (12), and a locking mechanism for limiting the displacement of the upper part of the concrete component (12) during testing; Jack (30); The jack (30) is fixed on the stand (10) and is used to apply pressure to the concrete component (12); a pressure sensor (31) for measuring the shear force of the concrete is provided on the front end surface of the jack (30); Loading platform (40); One end of the loading platform (40) is fixed to the first stand (10), and the other end is fixed to the second stand (11); the loading platform (40) is provided with a roller (41) for allowing the concrete component (12) to move when under pressure, and a displacement meter (42) for measuring the sliding distance of the concrete component (12).

2. The composite multi-layer concrete component shear tester according to claim 1, characterized in that: The fixing fixture (20) comprises a left baffle (21), a right baffle (22), a front baffle (23) and a rear baffle (24); the bottoms of the left baffle (21) and the right baffle (22) are provided with adjustment holes (25), and the adjustment holes (25) cooperate with the holes (13) on the stand (10); the left baffle (21) and the right baffle (22) are provided with baffles extending to the side, and the bottoms of the front baffle (23) and the rear baffle (24) are in contact with the baffles and can be slidably arranged thereon; the sides of the left baffle (21) and the right baffle (22) are provided with through elongated holes (26), and the sides of the front baffle (23) and the rear baffle (24) are provided with locking holes, and the elongated holes (26) and the locking holes are connected by bolts (27).

3. The composite multi-layer concrete component shear tester according to claim 1 or 2, characterized in that: The rollers (41) are made of stainless steel, and the spacing between the upper end surfaces of the rollers (41) is less than 1 / 4 of the cross-sectional width of the concrete specimen.

4. The composite multi-layer concrete component shear tester according to claim 3, characterized in that: The roller (41) is covered with a crawler belt (43).

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