Tensioning device for prestressed reinforcement

Abstract

The tensioning device comprises a mounting base, the mounting base is provided with a plurality of first penetrating holes allowing steel bars to penetrate through, the mounting base is provided with a plurality of limiting sleeves corresponding to the first penetrating holes, the limiting sleeves and the first penetrating holes are coaxially arranged, a plurality of deformation notches are formed in the limiting sleeves in a surrounding mode, and the deformation notches are arranged in the limiting sleeves. And the mounting seat is provided with a first driving piece for driving the limiting sleeve to shrink inwards. The method and the device have the effect of reducing rushing-up and springback.

Description

Technical Field

[0001] The present application relates to the technical field of tensioning devices, and in particular to a tensioning device for prestressed steel bars. Background Art

[0002] In order to make up for the gap between the tensile strain of concrete and steel bars during the construction of existing buildings, people apply prestressing to reinforced concrete structures, that is, applying tension to the steel bars to form a prestressed reinforced concrete structure.

[0003] In the existing method, the steel bars are usually tensioned by tensioning jacks, and then anchored. The steel bars will rebound to a certain extent after tensioning. After the steel bars rebound, the prestress applied by the steel bars on the concrete structure is often greatly different from the designed prestress. Utility Model Content

[0004] In order to reduce the rebound of steel bars, the present application provides a tensioning device for prestressed steel bars.

[0005] The prestressed steel bar tensioning device provided in this application adopts the following technical solution:

[0006] A tensioning device for prestressed steel bars includes a mounting seat, the mounting seat is provided with a plurality of first through holes for the steel bars to pass through, the mounting seat is provided with a plurality of limiting sleeves corresponding to the first through holes, the limiting sleeves and the first through holes are coaxially arranged, the limiting sleeves are surrounded by a plurality of deformation notches, and the mounting seat is provided with a first driving member for driving the limiting sleeves to shrink inward.

[0007] By adopting the above technical solution, a limiting sleeve is arranged on the mounting seat, and after tensioning, the limiting sleeve is driven inwardly by the first driving member to clamp the steel bar for limiting the position, thereby reducing the rebound of the steel bar after tensioning.

[0008] Optionally, a first mounting plate is provided on one side of the mounting seat, and the first mounting plate is slidably connected to the mounting seat along the axial direction of the mounting seat, and the mounting seat is provided with a second driving member for sliding the first mounting plate; the first driving member is an extrusion sleeve, and the extrusion sleeve is provided on the first mounting plate, and the extrusion sleeve and the limit sleeve are coaxially arranged, and the second driving member drives the first mounting plate to slide to force the extrusion sleeve to extrude the limit sleeve.

[0009] By adopting the above technical solution, when the steel bar needs to be limited, the second driving member drives the first mounting plate to move towards the mounting seat, thereby forcing the extrusion sleeve to squeeze the limiting sleeve, so that the limiting sleeve shrinks inward to limit the steel bar.

[0010] Optionally, the second driving member is a threaded rod, the threaded rod is passed through the first mounting plate and is threadedly connected to the mounting seat, a push block is fixed to the threaded rod, and the push block abuts against the first mounting plate.

[0011] By adopting the above technical solution, when the mounting plate needs to be driven to move, the threaded rod is rotated, and the threaded rod forces the first mounting plate to slide through the push block.

[0012] Optionally, a side surface of the push block is rotatably connected to a plurality of steel balls, the plurality of steel balls are distributed in a circular array around the axis of the threaded rod, and the steel balls abut against the first mounting plate.

[0013] Optionally, a second mounting plate is provided on one side of the mounting seat, and the first mounting plate is located between the second mounting plate and the mounting seat; a tensioning jack is provided on the second mounting plate.

[0014] By adopting the above technical solution, the mounting seat is provided with a second mounting plate and a tensioning jack. The steel bars can be tensioned by the tensioning jack, and then the steel bars are limited by the limiting sleeve to reduce the rebound of the steel bars. The tensioning jack is then removed and the steel bars are further anchored.

[0015] Optionally, an elastic pad is provided on the inner side of the limiting sleeve.

[0016] By adopting the above technical solution, since the steel bars are generally threaded steel bars and the surface of the threaded steel bars has protrusions, an elastic pad is provided on the inner side of the limiting sleeve. When clamping, the elastic pad can be deformed, thereby increasing the contact area with the steel bars and further increasing the clamping force.

[0017] Optionally, the inner diameter of the extrusion sleeve gradually decreases from a direction close to the limiting sleeve to a direction away from the limiting sleeve.

[0018] By adopting the above technical solution, the inner diameter of the extrusion sleeve gradually decreases from the direction close to the limiting sleeve to the direction away from the limiting sleeve. When the first mounting plate slides toward the mounting seat, the limiting sleeves can be forced to clamp toward each other.

[0019] Optionally, an annular protrusion is provided on the inner side of the elastic pad, and a plurality of the annular protrusions are provided, and the plurality of the annular protrusions are distributed along the axial direction of the limiting sleeve.

[0020] By adopting the above technical solution, a plurality of protrusions are arranged on the inner side of the elastic pad, thereby increasing the clamping force on the steel bar and further reducing the rebound of the steel bar.

[0021] In summary, the utility model has the following beneficial effects:

[0022] 1. The steel bar can be tensioned by the tensioning jack, and then the threaded rod is rotated to force the first mounting plate to move, and then the extrusion sleeve forces the limit sleeve to shrink inward to initially limit the steel bar, thereby reducing the rebound of the steel bar, so as to facilitate the removal of the tensioning jack, and then further anchor the steel bar;

[0023] 2. Since the steel bars are generally threaded steel bars, the surface of the threaded steel bars has protrusions, so an elastic pad is provided on the inner side of the limit sleeve. When clamping, the elastic pad can be deformed, thereby increasing the contact area with the steel bars, thereby increasing the clamping force. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of this embodiment;

[0025] Figure 2 yes Figure 1 The enlarged schematic diagram of point A in the middle;

[0026] Figure 3 It is a schematic diagram of the structure of the push block in this embodiment;

[0027] Figure 4 2 is a schematic diagram of the structure of the limit sleeve in this embodiment.

[0028] In the figure, 1. mounting seat; 11. limiting sleeve; 12. deformation notch; 13. annular protrusion; 14. sliding rod; 15. elastic pad; 2. tensioning jack; 3. first mounting plate; 31. extrusion sleeve; 32. threaded rod; 321. push block; 322. rotating groove; 323. steel ball; 4. second mounting plate; 41. connecting rod. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-4 This application is described in further detail.

[0030] The present application embodiment discloses a tensioning device for prestressed steel bars, referring to Figure 1 , including a mounting seat 1, the mounting seat 1 is provided with a plurality of first through holes for steel bars to pass through, a second mounting plate 4 is provided on one side of the mounting seat 1, a plurality of connecting rods 41 are provided between the mounting seat 1 and the second mounting plate 4, one end of the connecting rod 41 is fixedly connected to the mounting seat 1, and the other end of the connecting rod 41 is fixedly connected to the second mounting plate 4, and a tensioning jack 2 is fixedly connected to the second mounting plate 4.

[0031] Reference Figure 1 The mounting seat 1 is fixedly connected with a plurality of limit sleeves 11 corresponding to the first penetration hole. The limit sleeves 11 and the first penetration hole are coaxially arranged. A plurality of deformation notches 12 are arranged around the peripheral wall of the limit sleeve 11. The mounting seat 1 is provided with a first driving member for driving the limit sleeves 11 to shrink inward.

[0032] Reference Figure 1 and Figure 3 A first mounting plate 3 is provided on one side of the mounting seat 1, and the first mounting plate 3 is located between the second mounting plate 4 and the mounting seat 1. The mounting seat 1 is provided with a plurality of sliding rods 14, and the plurality of sliding rods 14 are arranged in a circumferential array, one end of the sliding rod 14 is fixedly connected to the mounting seat 1, and the other end of the sliding rod 14 is slidably penetrated through the first mounting plate 3, so that the first mounting plate 3 is slidably connected to the mounting seat 1 along the axial direction of the mounting seat 1.

[0033] The mounting seat 1 is provided with a second driving member for sliding the first mounting plate 3, and the second driving member is a threaded rod 32. The threaded rod 32 passes through the first mounting plate 3 and is threadedly connected to the mounting seat 1. The threaded rod 32 is fixed with a push block 321. The push block 321 is located on a side of the first mounting plate 3 away from the mounting seat 1, and the push block 321 abuts against the first mounting plate 3.

[0034] Reference Figure 1 and Figure 3 In order to reduce the friction between the push block 321 and the first mounting plate 3, a plurality of steel ball 323 grooves are opened on the side of the push block 321 close to the first mounting plate 3, and the plurality of steel ball 323 grooves are distributed around the axial direction of the threaded rod 32. The push block 321 is provided with a steel ball 323 rotatably connected to the steel ball 323 groove, and the steel ball 323 abuts against the side of the first mounting plate 3.

[0035] Reference Figure 1 and Figure 3 The first driving member is an extrusion sleeve 31, which is fixedly connected to the first mounting plate 3, and a plurality of extrusion sleeves 31 correspond to the limiting sleeves 11 one by one and are coaxially arranged. The inner diameter of the extrusion sleeve 31 gradually decreases from the direction close to the limiting sleeve 11 to the direction away from the limiting sleeve 11. The first mounting plate 3 is provided with a second penetration hole for the limiting sleeve 11 to pass through and enter into the extrusion sleeve 31. When the first mounting plate 3 slides in the direction close to the mounting seat 1, the limiting sleeve 11 passes through the second penetration hole and enters into the extrusion sleeve 31, and the extrusion sleeve 31 forces the limiting sleeve 11 to be clamped in the direction close to each other.

[0036] Reference Figure 4 The inner side of the limiting sleeve 11 is fixedly connected with an elastic pad 15. Since the steel bar is generally a threaded steel bar, the surface of the threaded steel bar has a protrusion, so the elastic pad 15 is arranged on the inner side of the limiting sleeve 11. When clamping, the elastic pad 15 can be deformed, thereby increasing the contact area with the steel bar, thereby increasing the clamping force. The inner side of the elastic pad 15 is protruding with an annular protrusion 13, and the annular protrusion 13 is arranged in a plurality, and the plurality of annular protrusions 13 are distributed along the axial direction of the limiting sleeve 11.

[0037] The implementation principle of the prestressed steel bar tensioning device of the embodiment of the present application is: the steel bar can be tensioned by the tensioning jack 2, and then the threaded rod 32 is rotated to force the first mounting plate 3 to move, and then the extrusion sleeve 31 forces the limiting sleeve 11 to shrink inward to initially limit the steel bar, thereby reducing the rebound of the steel bar, so as to facilitate the removal of the tensioning jack 2, and then further anchor the steel bar.

[0038] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A tensioning device for prestressed steel bars, characterized in that: The invention comprises a mounting seat (1), the mounting seat (1) being provided with a plurality of first through holes for steel bars to pass through, the mounting seat (1) being provided with a plurality of limiting sleeves (11) corresponding to the first through holes, the limiting sleeves (11) and the first through holes being coaxially arranged, the limiting sleeves (11) being provided with a plurality of deformation notches (12) around them, and the mounting seat (1) being provided with a first driving member for driving the limiting sleeves (11) to be tightened inwardly.

2. The prestressed steel bar tensioning device according to claim 1, characterized in that: A first mounting plate (3) is provided on one side of the mounting seat (1), the first mounting plate (3) being slidably connected to the mounting seat (1) along the axial direction of the mounting seat (1), and the mounting seat (1) is provided with a second driving member for sliding the first mounting plate (3); The first driving member is a pressing sleeve (31), the pressing sleeve (31) is arranged on the first mounting plate (3), the pressing sleeve (31) and the limiting sleeve (11) are arranged coaxially, and the second driving member drives the first mounting plate (3) to slide so as to force the pressing sleeve (31) to press the limiting sleeve (11).

3. The prestressed steel bar tensioning device according to claim 2, characterized in that: The second driving member is a threaded rod (32), the threaded rod (32) being passed through the first mounting plate (3) and being threadedly connected to the mounting seat (1), the threaded rod (32) being fixed with a push block (321), the push block (321) being in contact with the first mounting plate (3).

4. The prestressed steel bar tensioning device according to claim 3, characterized in that: A plurality of steel balls (323) are rotatably connected to the side surface of the push block (321); the plurality of steel balls (323) are distributed in a circular array around the axis of the threaded rod (32); and the steel balls (323) abut against the first mounting plate (3).

5. The prestressed steel bar tensioning device according to claim 2, characterized in that: A second mounting plate (4) is provided on one side of the mounting seat (1); the first mounting plate (3) is located between the second mounting plate (4) and the mounting seat (1); and a tensioning jack (2) is provided on the second mounting plate (4).

6. The prestressed steel bar tensioning device according to claim 1, characterized in that: An elastic pad (15) is provided on the inner side surface of the limiting sleeve (11).

7. The prestressed steel bar tensioning device according to claim 2, characterized in that: The inner diameter of the extrusion sleeve (31) gradually decreases from a direction approaching the limiting sleeve (11) to a direction away from the limiting sleeve (11).

8. The prestressed steel bar tensioning device according to claim 6, characterized in that: An annular protrusion (13) is provided on the inner side of the elastic pad (15), and a plurality of the annular protrusions (13) are provided, and the plurality of the annular protrusions (13) are distributed along the axial direction of the limiting sleeve (11).

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