Reinforcing steel bar sleeve connection anti-drawing test device

Abstract

The utility model relates to a steel bar sleeve connection anti-drawing test device which effectively solves the problem that steel bar drawing test equipment is low in clamping reliability. According to the technical scheme, the drawing device comprises two drawing units, each drawing unit comprises a first flat plate and a second flat plate, each flat plate is provided with a rib penetrating hole, a clamping unit is arranged between the two flat plates and comprises a first circular ring, a second circular ring and a third circular ring, the front quadrant point and the rear quadrant point of the first circular ring are hinged to the first flat plate, and the third circular ring is hinged to the second flat plate. The front and rear quadrant points of the third ring are hinged to the second ring, the upper quadrant point of the second ring is connected with the lower quadrant point of the first ring, the lower quadrant point of the second ring is hinged to the upper quadrant point of the third ring, and a second hydraulic cylinder is arranged between the second flat plates of the two pulling plate units; a plurality of clamping point positions can be formed in the axial direction of the steel bar, the steel bar can be prevented from sliding to the front side and the rear side during drawing, and higher reliability is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to drawing strength test equipment field, concretely is a kind of reinforcing steel sleeve connection tensile test device. BACKGROUND

[0002] Sleeve grouting connection is a kind of reinforcing steel permanent connection method, and its drawing test is an intuitive method to evaluate its connection strength;The utility model patent with application number CN202020433975.4 discloses a kind of reinforcing steel sleeve grouting connection joint drawing test device, it is driven to the clamping block of left and right two symmetries by hydraulic cylinder, the clamping block is moved towards and clamps reinforcing steel side wall, then carries out drawing, this clamping mode is also the means commonly used in the art, but its clamping point only has one, if slip occurs, it will directly lead to clamping failure;In addition, to prevent reinforcing steel from slipping to front and back side when clamping reinforcing steel of different diameters, a plurality of clamping grooves of different diameters are arranged on the clamping block, only one of these clamping grooves can be aligned with the axis of clamping hydraulic cylinder, when reinforcing steel is located in the remaining clamping grooves, the stability during clamping is reduced. SUMMARY

[0003] In order to improve the clamping reliability of reinforcing steel drawing test equipment, the utility model provides a kind of reinforcing steel sleeve connection tensile test device.

[0004] Its technical solutions include two groups of drawing units, each group of drawing units includes a first flat plate and a second flat plate, the two flat plates are arranged in parallel, a reinforcing steel hole is formed in each of the two flat plates, and the reinforcing steel holes in the two flat plates are aligned;A clamping unit is arranged between the two flat plates, the clamping unit includes a first ring, a second ring and a third ring, the first ring is hinged to the first flat plate at the front and rear quadrants, the third ring is hinged to the second ring at the front and rear quadrants, the upper quadrant of the second ring is connected to the lower quadrant of the first ring, and the lower quadrant of the second ring is hinged to the upper quadrant of the third ring;The two groups of drawing units are arranged symmetrically, and a second hydraulic cylinder is arranged between the second flat plates of the two groups of drawing units.

[0005] The second ring has one or more, and when there are multiple second rings, adjacent second rings are hinged at the upper and lower sides.

[0006] The first ring, the second ring and the third ring are all provided with anti-slip patterns.

[0007] The lower surface of the first flat plate is provided with two downwardly extending first hinge plates, the two first hinge plates are arranged in parallel, and the front and rear sides of the first ring are connected to the same side first hinge plate.

[0008] The upper surface of the second flat plate is provided with two upwardly extending second hinge plates, the two second hinge plates are arranged in parallel, and the front and rear sides of the third ring are connected to the same side second hinge plate.

[0009] The second flat plate is provided with a positioning groove matched with the end of the second hydraulic cylinder.

[0010] The utility model discloses a plurality of annular rings are straightened, and the annular rings press the outer wall of the reinforcing steel bar from the upper side and the lower side to clamp the reinforcing steel bar, can form a plurality of clamping points on the axial direction of the reinforcing steel bar, avoids the problem that the clamping failure is caused by the slip of a clamping point, and has higher reliability. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is the front view of the utility model when not clamping.

[0012] Figure 2 It is the front view of the utility model when clamping.

[0013] Figure 3 It is the perspective view of the utility model.

[0014] Figure 4 It is Figure 3 It is the enlarged view of position A.

[0015] Figure 5 It is the perspective view of the annular ring.

[0016] Figure 6 It is the plan view of the position of the annular ring and the reinforcing steel bar under the clamping state. DETAILED DESCRIPTION

[0017] Combining with the drawings, the utility model includes two groups of drawing unit, and each group of drawing unit includes a first flat plate 1 and a second flat plate 2, two flat plates are arranged in parallel, and first hydraulic cylinder 3 is arranged between the two flat plates, the distance between the two flat plates can be adjusted through first hydraulic cylinder 3, a reinforcing steel bar hole 4 is formed in the two flat plates, the reinforcing steel bar hole 4 on the two flat plates is in alignment and is used for the passage of sleeve reinforcing steel bar, clamping unit is arranged between the two flat plates, and the clamping unit includes first annular ring 5, second annular ring 6 and third annular ring 7, the front and rear quadrants of first annular ring 5 are hinged with first flat plate 1, the front and rear quadrants of third annular ring 7 are hinged with second annular ring 6, the upper quadrant of second annular ring 6 is connected with the lower quadrant of first annular ring 5, and the lower quadrant of second annular ring 6 is hinged with the upper quadrant of third annular ring 7, three annular rings are hinged into chain structure connected between the two flat plates, the reinforcing steel bar passes through the two reinforcing steel bar holes 4 and will pass through a plurality of annular rings in turn, when the two flat plates move away from each other, the annular ring chain is gradually straightened, and the upper side and the lower side of each annular ring will press the side wall of the reinforcing steel bar from the opposite direction and hold the reinforcing steel bar tightly, two groups of drawing unit are symmetrically arranged, second hydraulic cylinder 8 is arranged between the second flat plate 2 of two groups of drawing unit, after the clamping unit holds the reinforcing steel bar, two groups of drawing unit are driven to move away from each other through second hydraulic cylinder 8, and the drawing force is applied to the sleeve reinforcing steel bar.

[0018] The second ring 6 is provided in one or more ways. When there are multiple second rings 6, the upper and lower sides of adjacent second rings 6 are hinged. The more second rings 6 there are, the more clamping points there are for the reinforcing bars, and the more reliable the clamping is.

[0019] The first ring 5, the second ring 6, and the third ring 7 are all provided with anti-slip textures 9, which can increase the friction when clamping the reinforcing bar.

[0020] The lower surface of the first plate 1 is provided with two downwardly extending first hinge plates 10. The two first hinge plates 10 are arranged in parallel front to back. The front and rear sides of the first ring 5 intersect with the first hinge plates 10 on the same side, which can avoid interference between the first ring 5 and the lower surface of the first plate 1 when the first ring 5 rotates.

[0021] The upper surface of the second plate 2 is provided with two upwardly extending second hinge plates 11. The two second hinge plates 11 are arranged in parallel front to back. The front and rear sides of the third ring 7 intersect with the second hinge plates 11 on the same side, which can avoid interference between the third ring 7 and the upper surface of the second plate 2 when the third ring 7 rotates.

[0022] The second plate 2 is provided with a positioning groove 12 that cooperates with the end of the second hydraulic cylinder 8. After the two sets of pulling units are sleeved on the steel bar and clamped, the second hydraulic cylinder 8 is placed between the two second plates 2 and the end of the second hydraulic cylinder 8 is aligned with the positioning groove 12. Then the second hydraulic cylinder 8 extends and inserts into the positioning groove 12 to start loading.

[0023] In use, the present invention firstly places two sets of pulling units on both ends of the sleeve steel bar. Specifically, the sleeve steel bar is inserted through the through hole 4 on the second plate 2, passes through the third ring 7, the second ring 6 and the first ring 5 in sequence, and finally exits through the through hole 4 on the first plate 1. Then, the first hydraulic cylinder 3 is activated to push the first plate 1 and the second plate 2 to move in opposite directions, and the clamping unit is gradually straightened. The upper and lower sides of each ring press against the outer wall of the steel bar, forming a clamping force on the steel bar. The greater the pressure of the first hydraulic cylinder 3, the greater the clamping force.

[0024] like Figure 6 As shown, since the projection of the ring is an ellipse in the section perpendicular to the axial direction of the steel bar, the steel bar cannot slide forward or backward after the ring clamps it.

[0025] After the two sets of clamping units clamp the reinforcing bars, the second hydraulic cylinder 8 is placed between the two second plates 2, and the end of the second hydraulic cylinder 8 is aligned with the positioning groove 12. Then the second hydraulic cylinder 8 extends and inserts into the positioning groove 12 to start loading and perform a pull-out test on the sleeve reinforcing bar.

[0026] After the test is completed, the first hydraulic cylinder 3 retracts, and the multiple rings can then loosen the reinforcing bars.

[0027] The utility model discloses can form multiple clamping point in the steel bar axial, and can avoid the steel bar slip to two sides forward when drawing, has higher reliability.

Claims

1. A pull-out test device for a steel sleeve connection, comprising two groups of pull-out units, characterized in that, Each group of drawing units comprises a first flat plate (1) and a second flat plate (2), the two flat plates are arranged in parallel from top to bottom, a through-hole (4) is formed on each of the two flat plates, and the through-holes (4) on the two flat plates are aligned; a clamping unit is arranged between the two flat plates, the clamping unit comprises a first circular ring (5), a second circular ring (6) and a third circular ring (7), the front and rear quadrants of the first circular ring (5) are hinged to the first flat plate (1), the front and rear quadrants of the third circular ring (7) are hinged to the second circular ring (6), the upper quadrant of the second circular ring (6) is connected to the lower quadrant of the first circular ring (5), and the lower quadrant of the second circular ring (6) is hinged to the upper quadrant of the third circular ring (7); the two groups of drawing units are arranged in symmetry from top to bottom, and the second flat plates (2) of the two groups of drawing units are provided with a second hydraulic cylinder (8).

2. A pull-out test device for a steel sleeve joint according to claim 1, characterised in that The second circular ring (6) is provided with one or more, when the second circular ring (6) is provided with multiple, the adjacent second circular rings (6) are hingedly connected on the upper and lower sides.

3. A pull-out resistance test device for a sleeve connection according to claim 1 or 2, c h a r a c t e r i s e d in that The first circular ring (5), the second circular ring (6) and the third circular ring (7) are all provided with anti-skid lines (9).

4. A pull-out test device for a steel sleeve joint according to claim 1, wherein The lower surface of the first flat plate (1) is provided with two first hinge plates (10) extending downwards, the two first hinge plates (10) are arranged in parallel from front to back, and the front and rear sides of the first circular ring (5) are connected to the first hinge plates (10) on the same side.

5. A pull-out test device for a steel sleeve joint according to claim 1, wherein The upper surface of the second flat plate (2) is provided with two second hinge plates (11) extending upwards, the two second hinge plates (11) are arranged in parallel from front to back, and the front and rear sides of the third circular ring (7) are connected to the second hinge plates (11) on the same side.

6. A pull-out test device for a steel sleeve joint according to claim 1, characterized in that The second flat plate (2) is provided with a positioning groove (12) matched with the end of the second hydraulic cylinder (8).

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