Prestressing tools for prestressed components

Abstract

The present application discloses a tensioning tool for a prestressed component, the prestressed component includes a prestressed tendon and a locking member and a support seat that are sleeved on the prestressed tendon. The tensioning tool includes a hydraulic cylinder with a center hole, a hollow bottom shell, a locking sleeve and a connecting piece. The hydraulic cylinder includes a cylinder body and a piston, and the piston has an initial position retracted into the cylinder body and a tensioning position extending out of the cylinder body; the bottom of the bottom shell has a perforation for the prestressed tendon and the locking member to pass through, and the top is connected to the cylinder body so that its internal cavity is connected to the center hole; the bottom of the locking sleeve is supported on the bottom shell, and has a sliding channel with a butt-jointed perforation and a cross-sectional shape that is adapted to the locking member; the first end of the connecting piece penetrates the center hole and has an internal thread for connecting the prestressed tendon, and the second end is located outside the center hole and is provided with a limiter that abuts against the piston. Compared with the prior art, the connecting piece is connected to the prestressed tendon through an internal thread so that the hydraulic cylinder can stably tension the prestressed tendon.

Description

Technical Field

[0001] The present application belongs to the technical field of geotechnical engineering anchoring and supporting, and in particular, relates to a tensioning tool for prestressed components. Background Art

[0002] During the construction of underground projects, mine tunnels, railway tunnels and slope protection, the ground needs to be reinforced to prevent ground deformation, collapse and instability. The main measure is to bury anchor rods with expansion shell anchor heads in the ground, and use the tension of the anchor rods and the concrete grouting body integrated with the anchor rods to reinforce the ground, so that the ground forms an integral structure, thereby achieving the purpose of controlling its deformation.

[0003] In order to tension the anchor rod, a Chinese patent document with publication number CN208604595U discloses a prestressed anchor rod tensioning device, including a tensioning cylinder and an extension rod, wherein the extension rod is connected to the prestressed anchor rod through a threaded sleeve, and the other end of the extension rod is connected to the tensioning cylinder.

[0004] Among them, a hole is provided in the middle of the piston rod in the tensioning cylinder, and an external conical threaded sleeve is threadedly installed in the hole of the piston rod. When the extension rod is placed in the external conical threaded sleeve, the internal conical clip is pressed between the external conical threaded sleeve and the extension rod to fix the extension rod and the piston rod.

[0005] Although the above structure can connect the anchor rod to the tensioning cylinder, when the friction between the conical clip and the extension rod is small, the tensioning cylinder is easy to pull off the extension rod. Summary of the invention

[0006] In order to solve the above technical problems, the present application provides a tensioning tool for a prestressed component, wherein the prestressed component includes a prestressed tendon and a locking member and a support seat sleeved on the prestressed tendon, and the tensioning tool includes:

[0007] A hydraulic cylinder having a central hole, the hydraulic cylinder comprising a cylinder body and a piston, the piston having an initial position retracted into the cylinder body and a tensioned position extending out of the cylinder body;

[0008] A hollow bottom shell, wherein the bottom of the bottom shell has a through hole for the prestressed tendons and the locking member to pass through, and the top of the bottom shell is connected to the cylinder body so that the internal cavity thereof is connected to the central hole;

[0009] A locking sleeve, the bottom of which is supported by the bottom shell and has a sliding channel that butts against the through hole and has a cross-sectional shape that is adapted to the locking member;

[0010] A connecting piece, wherein the connecting piece has a first end and a second end relative to each other along the extension and retraction direction of the piston, wherein the first end penetrates into the center hole for connecting to the prestressed tendon, and the second end is located outside the center hole and is provided with a limiting portion that abuts against the piston.

[0011] Several optional methods are also provided below, but they are not intended to be additional limitations on the above-mentioned overall solution, but are merely further supplements or preferences. Under the premise that there are no technical or logical contradictions, each optional method can be combined with the above-mentioned overall solution separately, and multiple optional methods can also be combined.

[0012] Optionally, the connecting member is a hollow cylindrical structure, the inner wall of the first end thereof is provided with an internal thread for connecting the prestressed tendon, and the second end is enlarged to form the limiting portion.

[0013] Optionally, the limiting portion has anti-slip teeth arranged along the circumferential direction.

[0014] Optionally, an inner plug extending into the center hole is provided on the side of the limiting portion close to the piston.

[0015] Optionally, in the initial position of the piston, the first end extends into the sliding channel.

[0016] Optionally, the top of the locking sleeve extends into the central hole.

[0017] Optionally, the outer wall of the locking sleeve has a first limiting surface that matches the cylinder body.

[0018] Optionally, the tensioning device includes a wrench for driving the locking sleeve and the locking member to rotate synchronously, and the wrench includes an annular portion inserted on the locking sleeve and an operating portion extending out of the bottom shell.

[0019] Optionally, a gear ring is provided on the outer wall of the locking sleeve, and a ratchet engaged with the gear ring and a first elastic member acting on the ratchet are provided on the inner side of the annular portion.

[0020] Optionally, a check tooth meshing with the gear ring and a second elastic member acting on the check tooth are embedded in the inner wall of the bottom shell.

[0021] The tensioning tool of the prestressed member in the present application, the connecting piece is connected to the prestressed tendon through an internal thread, so that the hydraulic cylinder can stably tension the prestressed tendon;

[0022] The bottom shell, oil cylinder, wrench and other components are integrated into one, so that the tensioning tool is easy to install and can quickly realize prestressed axial tensioning and locking. During the prestressing operation, it not only greatly shortens the operation time and operation space, but also can unify and standardize the fast and effective application of prestress, providing a convenient and efficient tensioning tool for prestressed construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of an anchor rod and a tensioning tool according to an embodiment of the present application;

[0024] Figure 2 for Figure 1 Schematic diagram of the exploded structure of the middle anchor rod and tensioning tool;

[0025] Figure 3 for Figure 1 Sectional view of the structure of the middle anchor rod and tensioning tool;

[0026] Figure 4 for Figure 2 A schematic diagram of the structure of the mid-bottom shell;

[0027] Figure 5 for Figure 2 A schematic diagram of the structure of the middle locking member;

[0028] Figure 6 for Figure 2 A schematic structural diagram of the middle locking member from another perspective;

[0029] Figure 7 for Figure 2 The structural diagram of the connecting parts;

[0030] Figure 8 for Figure 2 The structural diagram of the middle wrench;

[0031] Fig. 9 for Figure 3 A schematic diagram of the structure of the middle wrench and the locking member;

[0032] Fig.10 Bit Figure 3 Schematic diagram of the structure of the middle bottom shell and the locking member.

[0033] The reference numerals in the figures are described as follows:

[0034] 10. Prestressed component; 11. Prestressed tendon; 12. Locking piece; 13. Support seat; 14. Ball pad;

[0035] 20. Hydraulic cylinder; 21. Cylinder body; 22. Piston; 23. Center hole;

[0036] 30. bottom shell; 31. perforation; 32. avoidance groove; 34. second limiting surface;

[0037] 40. Connecting member; 41. First end; 42. Second end; 43. Internal thread; 44. Position limiting portion; 441. Anti-slip teeth; 442. Internal plug;

[0038] 50. Locking sleeve; 51. Sliding channel; 52. First limiting surface; 53. Guide portion; 531. Reduced diameter section; 54. Gear ring; 541. Gear; 542. Guide surface; 543. Check surface;

[0039] 60. wrench; 61. annular portion; 611. mounting groove; 612. ratchet; 613. first elastic member; 62. operating portion;

[0040] 70. Anti-reverse tooth. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] It should be noted that when a component is referred to as being "connected" to another component, it may be directly connected to the other component or there may be a central component. When a component is referred to as being "disposed on" another component, it may be directly disposed on the other component or there may be a central component at the same time.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0044] like Figure 1 to Figure 2 As shown, the prestressed component 10 includes a prestressed tendon 11 and a locking member 12 and a support seat 13 which are sleeved on the prestressed tendon 11 .

[0045] The prestressed tendon 11 is in the shape of a rod, which can be a hollow structure or a solid structure; the support seat 13 has a connection hole for the prestressed tendon 11 to pass through; the position between the locking piece 12 and the prestressed tendon 11 can be relatively fixed and can be close to the support seat 13. For example, in the figure, the prestressed component 10 is an anchor rod, and the following embodiments are described by taking the anchor rod as an example. Among them, the outer surface of the prestressed tendon 11 is provided with an external thread; the locking piece 12 is a nut that can be screwed on the prestressed tendon 11.

[0046] The prestressed component 10 also includes a ball pad 15, which is in the shape of a spherical segment; the ball pad 15 has a through hole for the prestressed tendon 11 to pass through; when the ball pad 15 is sleeved on the outside of the prestressed tendon 11, the arc surface of the ball pad 15 is in contact with the inner wall of the connecting hole on the support seat 13, and the flat surface is in contact with the locking piece 12.

[0047] In order to achieve the tensioning of the prestressed member 10, Figures 1 to 3 As shown, the present application provides a tensioning tool, comprising:

[0048] A hydraulic cylinder 20 having a central hole 23, the hydraulic cylinder 20 comprising a cylinder body 21 and a piston 22, the piston 22 having an initial position retracted into the cylinder body 21 and a tensioning position extended out of the cylinder body 21;

[0049] A hollow bottom shell 30, the bottom of which has a through hole 31 for the prestressed tendons 11 and the locking member 12 to pass through, and the top of which is connected to the cylinder body 21 so that the inner cavity thereof is connected to the central hole 23;

[0050] A locking sleeve 50, the bottom of which is supported on the bottom shell 30, and has a sliding channel 51 which is connected to the through hole 31 and has a cross-sectional shape adapted to the locking member 12;

[0051] The connecting member 40 has a first end 41 and a second end 42 relative to each other along the extension and retraction direction of the piston 22. The first end 41 penetrates into the center hole 23 and has an internal thread 43 for connecting the prestressed tendon 11. The second end 42 is located outside the center hole 23 and is provided with a limiting portion 44 that abuts against the piston 22.

[0052] The bottom shell 40 is sleeved on the outside of the prestressed tendon 11 and the locking piece 12, and abuts against the support seat 13 or the ball pad 14. The connecting piece 40 is threadedly connected to the prestressed tendon 11. After the piston 22 switches from the initial position to the corresponding tensioning position, the locking piece 12 is driven to rotate through the locking sleeve 50, so that the locking piece 12 is tightened on the prestressed tendon 11.

[0053] The center hole 23 axially passes through the hydraulic cylinder 20, that is, the center hole 23 passes through the cylinder body 21 and the piston 22, and extends along the moving direction of the piston 22. The initial position and the tensioning position of the piston 22 are relative concepts, and there is no strict position limit. For example: before the tensioning tool tensions the prestressed member 10, the position of the piston 22 is the initial position; when the piston 22 extends out of the cylinder body 21 relative to the initial position and the position where the prestressed tendon 11 is tensioned into place is the tensioning position.

[0054] The bottom shell 30 has a cylindrical structure; the bottom shell 30 has a top and a bottom opposite to each other, the top is a side facing the cylinder body 21 , and the bottom is a side facing the support seat 13 .

[0055] The locking sleeve 50 can transmit the external force to the locking member 12 to drive the locking member 12 to rotate. During the tensioning process of the prestressed member 10 or the rotation process of the locking member 12, the locking member 12 will move along the extension direction of the sliding channel 51 to prevent the locking member 12 from being separated from the locking sleeve 50. For example, in the figure, the cross section of the sliding channel 51 is an equilateral hexagon.

[0056] The connector 40 directly connects the prestressed tendon 11 to the piston 22 without other connecting parts, so as to simplify the structure of the tensioning tool. The connector 40 is threadedly connected to the prestressed tendon 11, which can strengthen the connection strength between the connector 40 and the prestressed tendon 11.

[0057] For the specific structure of the bottom shell 30, refer to the attached Figure 4 In the example shown, the top of the bottom shell 30 is open and connected to the cylinder body 21; the bottom shell 30 has a second limiting surface 34, and a part of the cylinder body 21 extends into the bottom shell 30 and matches the second limiting surface 34, and is fixed to the bottom shell 30 by means of screws or the like. The inner wall of the cylinder body 21 is stepped to form the second limiting surface 34 facing the top; the inner wall of the bottom of the cylinder body 21 supports the locking sleeve 50.

[0058] For the specific structure of the locking sleeve 50, refer to the attached Figure 3 , Attachment Figure 5 And attached Figure 6 In the example shown, the top of the locking sleeve 50 extends to the inside of the central hole 23, so as to increase the stroke of the sliding channel 51 and reduce the internal space of the bottom shell 30 occupied by the locking sleeve 50, so as to make the structure of the entire tensioning device more compact. The outer wall of the locking sleeve 50 has a first limiting surface 52 that cooperates with the cylinder body 21, so as to limit the locking sleeve 50 in the bottom shell 30. The first limiting surface 52 is close to or close to the cylinder body 21.

[0059] The portion of the locking sleeve 50 extending into the center hole 23 is the guide portion 53. The guide portion 53 is in clearance fit with the center hole 23, so as to limit the radial position of the locking sleeve 50 and guide the axial direction of the locking sleeve 50. The guide portion 53 has a reduced diameter section 531, so as to guide the locking sleeve 50 into the center hole 23. The reduced diameter section 531 is located at the end of the guide portion 53; the outer diameter of the reduced diameter section 531 is smaller than the outer diameter of other structures of the guide portion 53, and there is a step at the junction with other structures of the guide portion 53.

[0060] For the specific configuration of the connecting member 40, refer to the attached Figure 3 And attached Figure 7In the example shown, the connecting member 40 is a hollow cylindrical structure and has an axis in space, which coincides with the axis of the bottom shell 30. The inner wall of the first end 41 of the connecting member 40 is provided with an internal thread 43, and the second end 42 is enlarged to form a limit portion 44 (for example, disc-shaped). In the initial position of the piston 22, the first end 41 extends into the sliding channel 51 so that the first end 41 avoids the locking sleeve 50, further making the structure of the tensioning tool compact. Among them, the interior of the connecting member 40 is axially connected to adapt to different lengths of the prestressed tendons 11 extending into the connecting member 40.

[0061] In the structure of the position-limiting portion 44, in this embodiment, the position-limiting portion 44 has anti-slip teeth 441 arranged along the circumferential direction, and the operator can cooperate with the anti-slip teeth 441 manually or with an external tool to facilitate radial operation of the connecting member 40. The side of the position-limiting portion 44 close to the piston 22 is provided with an inner plug 442 extending into the central hole 23, and the peripheral edge of the inner plug 442 is in contact with the inner wall of the central hole 23 to achieve radial position positioning between the connecting member 40 and the piston 22.

[0062] In this embodiment, if Figures 8 to 9 As shown, the tensioning tool also includes a wrench 60 for driving the locking sleeve 50 and the locking member 12 to rotate synchronously, and the wrench 60 includes an annular portion 61 inserted on the locking sleeve 50 and an operating portion 62 extending from the bottom shell 30. By pulling the operating portion 62, the locking sleeve 50 and the locking member 12 can be driven to move synchronously through the annular portion 61.

[0063] The operating portion 62 is in the shape of a rod, one axial end of the rod is connected to the outer periphery of the annular portion 61, and the other end extends out of the bottom shell 30. The bottom shell 30 has an escape groove 32 for the operating portion 62 to pass through, and the escape groove 32 can limit the rotation angle of the operating portion 62 on both sides along the circumference of the bottom shell 30.

[0064] The annular portion 61 is generally annular; the rotation axis of the annular portion 61 is coaxially arranged with the rotation axis of the locking sleeve 50. In the cooperation between the annular portion 61 and the locking sleeve 50, for example, the outer wall of the locking sleeve 50 is provided with a toothed ring 54, and the inner side of the annular portion 61 is provided with a ratchet 612 meshing with the toothed ring 54 and a first elastic member 613 acting on the ratchet 612.

[0065] The ratchet 612 is plate-shaped and has a rotating end and a mating end opposite to each other. The inner wall of the annular portion 61 has a mounting groove 611, one side wall of which is inclined with respect to the radial direction of the annular portion 61; the rotating end of the ratchet 612 is rotatably mounted on the bottom of the mounting groove 611 by means of a rotating shaft or the like, one end of a first elastic member 613 (such as a compression spring) is pressed between the mating end of the ratchet 612 and the bottom wall of the mounting groove 611, the ratchet 612 fits the inclined side wall of the mounting groove 611, and the mating end extends out of the mounting groove 611 and matches with the gear ring 54.

[0066] In the specific structure of the gear ring 54, as shown in FIG. Figure 5 and Figure 6 As shown, the gear ring 54 is located in the bottom shell 30, and forms a first limiting surface 52 at the connection with the side wall of the locking sleeve 50; along the circumference of the locking sleeve 50, the gear ring 54 includes a plurality of latching teeth 541, and the two sides of the latching teeth 541 are respectively a guide surface 542 and a non-return surface 543, and the guide surface 542 and the non-return surface 543 intersect to form a tooth tip. During the forward rotation of the annular portion 61, the ratchet 612 can pass over the guide surface 542; when the annular portion 61 rotates in the reverse direction, the ratchet 612 is blocked by the non-return surface 543. Among them, the reverse rotation of the annular portion 61 corresponds to the tightening direction of the locking member 12.

[0067] In this embodiment, if Fig.10 As shown, the inner wall of the bottom shell 30 is embedded with a check tooth 70 meshing with the gear ring 54 and a second elastic member acting on the check tooth 70. A placement groove is provided on the inner wall of the bottom shell 30, and the check tooth 70 is movably embedded in the placement groove. A second elastic member 71 (such as a compression spring) is pressed between the check tooth 70 and the bottom wall of the placement groove. During the forward rotation of the locking sleeve 50, the check tooth 70 can pass over the guide surface 542; when the locking sleeve 50 rotates in the reverse direction, the check tooth 70 is blocked by the check surface 543. Among them, the check tooth 70 and the ratchet 612 are arranged in sequence along the axial direction of the locking sleeve 50.

[0068] The specific process of tensioning the prestressed member 10 by the tensioning tool is described below;

[0069] Put the bottom shell 30 on the prestressed tendon 11 until the bottom shell 30 abuts against the support seat 13 or the ball pad 14, and the locking member 12 is located in the bottom shell 30;

[0070] The first end portion 41 of the connecting member 40 extends into the central hole 23 and is screwed to the outside of the prestressed tendon 11, and the connecting member 40 and the prestressed tendon 11 are tightened;

[0071] The piston 22 of the hydraulic cylinder 20 is lifted, and the piston 22 tensions the prestressed tendon 11 through the connecting piece 40;

[0072] When the operating portion 62 is pulled in the reverse direction, the ratchet teeth 612 on the annular portion 61 are blocked by the non-return surface 543 on the locking sleeve 50 to drive the locking sleeve 50 to rotate, and the locking sleeve 50 finally drives the locking member 12 to be tightened.

[0073] When the wrench 60 is turned in the reverse direction to the limit position, the locking member 12 may not be rotated to the correct position. At this time, the operating portion 62 can be turned forward, and the ratchet 612 on the annular portion 61 passes over the guide surface 542 until the annular portion 61 can be turned in the reverse direction, and then the operating portion 62 is turned in the reverse direction; this step is repeated until the locking member 12 is rotated to the correct position.

[0074] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. When the technical features in different embodiments are embodied in the same figure, it can be regarded that the figure also discloses the combination examples of the various embodiments involved.

[0075] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A tensioning tool for a prestressed component, the prestressed component comprising a prestressed tendon and a locking member and a support seat sleeved on the prestressed tendon, characterized in that: The tensioning tool comprises: A hydraulic cylinder having a central hole, the hydraulic cylinder comprising a cylinder body and a piston, the piston having an initial position retracted into the cylinder body and a tensioned position extending out of the cylinder body; A hollow bottom shell, wherein the bottom of the bottom shell has a through hole for the prestressed tendons and the locking member to pass through, and the top of the bottom shell is connected to the cylinder body so that the internal cavity thereof is connected to the central hole; A locking sleeve, the bottom of which is supported by the bottom shell and has a sliding channel that butts against the through hole and has a cross-sectional shape that is adapted to the locking member; A connecting piece, wherein the connecting piece has a first end and a second end opposite to each other along the expansion and contraction direction of the piston, wherein the first end penetrates into the central hole and has an internal thread for connecting the prestressed tendon, and the second end is located outside the central hole and is provided with a limiting portion abutting against the piston; The top of the locking sleeve extends to the inside of the central hole; The outer wall of the locking sleeve has a first limiting surface that matches the cylinder body; In the initial position of the piston, the first end extends into the sliding channel; A portion of the cylinder body extends into the bottom shell, and the bottom shell has a second limiting surface that matches the cylinder body.

2. The tensioning tool for prestressed components according to claim 1, characterized in that: The connecting piece is a hollow cylindrical structure, the inner wall of the first end portion is provided with the internal thread, and the second end portion is enlarged to form the limiting portion.

3. The tensioning tool for prestressed components according to claim 2, characterized in that: The limiting portion has anti-slip teeth arranged along the circumferential direction.

4. The tensioning tool for prestressed components according to claim 2, characterized in that: The side of the limiting portion close to the piston is provided with an inner plug extending into the central hole.

5. The tensioning tool for prestressed components according to claim 1, characterized in that: The tensioning device comprises a wrench for driving the locking sleeve and the locking member to rotate synchronously, and the wrench comprises an annular portion sleeved on the locking sleeve and an operating portion extending out of the bottom shell.

6. The tensioning tool for prestressed components according to claim 5, characterized in that: The outer wall of the locking sleeve is provided with a gear ring, and the inner side of the annular portion is provided with ratchet teeth meshed with the gear ring and a first elastic member acting on the ratchet teeth.

7. The tensioning tool for prestressed components according to claim 5, characterized in that: The inner wall of the bottom shell is embedded with a non-return tooth meshed with the gear ring and a second elastic member acting on the non-return tooth.

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