Lossless tensioning hydraulic limiting device

Abstract

The utility model discloses a lossless tensioning hydraulic limiting device, which belongs to the technical field of anchoring engineering and is characterized in that a limiting plate pushing assembly, a pressing plate and a limiting counter-force support are arranged, one end of a hollow jack acts on a side slope through a second jack and the limiting counter-force support in the process of tensioning an anchor cable, and the other end of the hollow jack acts on the side slope through the pressing plate and the limiting counter-force support; after the anchor cable is tensioned in place through the hollow jack, the limiting plate pushing assembly pushes the pressing plate to press the working clamping piece into the working anchorage device to fix the anchor cable, in the tensioning process, the working clamping piece is loosely arranged on the anchor cable in a sleeving mode, and the problem that internal threads in the working clamping piece and the anchor cable are damaged is solved; the mode that the working clamping pieces are actively locked after tensioning is in place is adopted, stress loss of pulling back is avoided after tensioning of the device is completed, accuracy of tensioning stress is guaranteed, the device is of a combined structure capable of being conveniently and rapidly separated, and when a single part of the device is damaged or the models of working anchorage devices needed by a side slope are different, the device can be conveniently and rapidly detached. And a single part can be rapidly replaced and used, and inconvenience of whole part replacement is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of anchoring engineering, and particularly relates to a non-destructive tensioning hydraulic limiting device. Background Art

[0002] The anchoring project uses prestressed anchor cable technology. During the construction process of the structure to be reinforced and before it is put into use, a large prestress is applied to the project to be reinforced in advance, so that the reinforced structure remains stable. Therefore, the anchoring project will be widely used in permanent civil reinforcement projects such as landslides, high slopes, and dam foundations.

[0003] The current tensioning device includes a working anchor, a working clip, a limit plate, a hollow jack and a tool anchor plate. Before use, the working clip is passed through the anchor cable and placed in the through hole of the working anchor, and then the limit plate, the hollow jack and the tool anchor plate are installed in sequence. When working, the hollow jack is started, the lower end of the hollow jack is against the limit plate, and the upper end is against the tool anchor plate. When the hollow jack is gradually extended, the anchor cable is gradually tensioned until a predetermined tensioning force is reached. Finally, the hollow jack is turned off, the tool anchor plate, the jack and the limit plate are removed, and at this time, the anchor cable is locked on the working anchor by the working clip;

[0004] Although there is no problem with the existing tensioning device in terms of working principle, the following problems may occur during actual use:

[0005] Since the limit groove of the limit plate of the current tensioning device is fixed and the stress degree of the working clamp cannot be adjusted, during the tensioning process, the reaction force of the hollow jack is pressed onto the limit plate and directly transmitted to the working clamp through the limit plate, which causes the anchor cable to rub against the internal thread of the working clamp during use, resulting in damage to the working clamp and the anchor cable; on the other hand, after the internal thread of the working clamp is damaged, it will cause the steel strand to slip, and when locking the steel strand, due to the excessive friction between the clamp and the steel strand, the force of the jack cannot be directly transmitted to the steel strand behind the working clamp, and its locking function will be reduced, resulting in a loss of locking load, that is, a loss of prestress, and when the prior art is used, a single hollow jack is used, and when the working clamp is locked, the anchor cable will pull back a certain amount of the working clamp, and stress loss will occur in this process. If the threads of the clamp and the anchor cable are severely worn in this process, the stress loss will also increase. Utility Model Content

[0006] 1. Technical issues to be resolved

[0007] In order to overcome the shortcomings of the prior art, a non-destructive tensioning hydraulic limit device is proposed to solve the problem that the limiting groove of the limiting plate of the current tensioning device is dead and the force degree of the working clamp cannot be adjusted. During the tensioning process, the reaction force of the hollow jack is pressed onto the limiting plate and directly transmitted to the working clamp through the limiting plate, which causes the anchor cable to rub against the internal thread of the working clamp during use, resulting in damage to the working clamp and the anchor cable; on the other hand, after the internal thread of the working clamp is damaged, the steel strand will slip off. When locking the steel strand, due to the excessive friction between the clamp and the steel strand, the force of the jack cannot be directly transmitted to the steel strand behind the working clamp, and its locking function will decrease, resulting in a loss of locking load, that is, a loss of prestress. When the prior art is used, a single hollow jack is used. When the working clamp is locked, the anchor cable will pull back a certain amount of the working clamp, and stress loss will occur in this process. If the threads of the clamp and the anchor cable are severely worn during this process, the stress loss will also increase.

[0008] (II) Technical solution

[0009] The utility model is implemented through the following technical solutions: the utility model proposes a non-destructive tensioning hydraulic limit device, the structure of which includes a working anchor, a working clip, a hollow jack and a tool anchor plate, the working anchor and the tool anchor plate are both provided with through holes allowing the anchor cable to pass through, the working clip is placed in the through hole, the hollow jack includes a first piston rod and a first cylinder body, the tool anchor plate is assembled on the side of the first piston rod away from the first cylinder body, and the hollow jack is used to press the tool anchor plate away from the working anchor;

[0010] It also includes a limit plate pushing assembly, a pressure plate and a limit reaction force support, the limit plate pushing assembly is assembled in reverse with the hollow jack, the limit plate pushing assembly is equipped with a pressure plate on the side away from the hollow jack, the limit reaction force support is hollow cylindrical as a whole, one end of the limit reaction force support covers the working anchor inside, the limit plate pushing assembly includes a second piston rod and a second cylinder body, the second cylinder body is away from the second piston rod end and is in contact with the first cylinder body away from the first piston rod side, the second cylinder body is provided with a boss structure provided at the second piston rod end and combined with the limit reaction force support, the other end of the limit reaction force support is covered and sleeved on the boss structure of the second cylinder body, the second piston rod and the pressure plate are arranged in the limit reaction force support, and the second piston rod is equipped with a pressure plate on the side away from the second cylinder body;

[0011] The limit plate pushes the assembly to lock the anchor cable by pressing the working clip of the working anchor through the pressure plate.

[0012] Furthermore, the outer diameter of the limit plate pushing assembly is larger than the inner diameter of the hollow jack.

[0013] Furthermore, the limiting reaction force support is composed of an observation hole, a support body, a docking groove, an internal thread groove, an adjustable limiting ring and an external thread groove. The support body is provided with an observation hole on the upper side, and a docking groove is provided on the upper side of the inner ring end of the support body. The support body is combined with the boss structure of the second cylinder body through the docking groove. The support body is provided with an internal thread groove on the lower side of the inner ring end, and the outer ring end of the adjustable limiting ring is provided with an external thread groove. The adjustable limiting ring is threadedly connected to the internal thread groove of the support body through the external thread groove, and the adjustable limiting ring is used for limiting the working anchor.

[0014] Furthermore, the pressure plate is provided with an equal number of notches for passing anchor cables according to the through holes of the working anchor and the tool anchor plate.

[0015] Furthermore, the pressure plate is provided with more than two connecting columns, and the pressure plate is assembled on the second piston rod through the connecting columns.

[0016] Furthermore, one end of the connecting column is connected to the pressure plate, and the other end of the connecting column is provided with a first limiting boss and a second limiting boss, and a limiting groove is provided between the first limiting boss and the second limiting boss.

[0017] Furthermore, the diameter of the first limiting boss is smaller than the diameter of the second limiting boss.

[0018] Furthermore, the second piston rod is provided with a strip hole with a convex cross-section, the smaller side of the strip hole passes through the second piston rod, and one end of the strip hole is provided with a matching hole allowing the first limiting boss to be inserted therein.

[0019] Furthermore, the minimum spacing of the strip holes is between the diameter of the connecting column and the diameter of the first limiting boss, the maximum spacing of the strip holes is greater than the diameter of the first limiting boss, and the diameter of the matching hole is between the diameter of the first limiting boss and the diameter of the second limiting boss.

[0020] Furthermore, a gasket is arranged on the side of the second limiting boss adjacent to the first limiting boss.

[0021] (III) Beneficial effects

[0022] One of the above technical solutions has the following advantages or beneficial effects:

[0023] In order to solve the problem that the limiting groove of the limiting plate of the current tensioning device is fixed and the force degree of the working clamp cannot be adjusted, during the tensioning process, the reaction force of the hollow jack is pressed onto the limiting plate and directly transmitted to the working clamp through the limiting plate, which causes the anchor cable to rub against the internal thread of the working clamp during use, resulting in damage to the working clamp and the anchor cable; on the other hand, after the internal thread of the working clamp is damaged, the steel strand will slip off, and when locking the steel strand, the clamp and the steel strand are too tightly rubbed, resulting in the inability of the jack's force to be directly transmitted to the steel strand behind the working clamp, and its locking function will be reduced, resulting in a loss of locking load, that is, a loss of prestress, and when the prior art is used, a single hollow jack is adopted, and when the working clamp is locked, the anchor cable will pull back a certain working clamp, and stress loss will occur in this process. If the threads of the clamp and the anchor cable are severely worn in this process, it will also increase In order to prevent the loss of stress, a limit plate push assembly, a pressure plate and a limit reaction force support are set. During the tensioning process of the anchor cable, one end of the hollow jack acts on the slope through the second cylinder of the second jack and the limit reaction force support. After the anchor cable is tensioned into place by the hollow jack, the limit plate push assembly pushes the pressure plate to press the working clip into the working anchor, thereby fixing the anchor cable. During the tensioning process of the anchor cable, the working clip is loosely sleeved on the anchor cable without mutual wear with the anchor cable, thereby preventing the internal thread in the working clip and the anchor cable from being damaged. At the same time, the method of actively locking the working clip after tensioning is in place also ensures that there will be no stress loss due to pullback after the device is tensioned, thereby ensuring the accuracy of the tensioning stress. The device adopts a combined structure that can be easily separated, so that when a single component is damaged or the working anchor model required for the slope is different, the device can be quickly replaced and used, avoiding the inconvenience of replacing the entire component. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0025] Figure 1 It is a structural schematic diagram of the non-destructive tensioning device of the anchor cable of this embodiment;

[0026] Figure 2 This is a schematic diagram of the structure of the non-destructive tensioning device of the anchor cable in this embodiment.

[0027] Figure 3 It is a schematic diagram of the connection between the pressing plate and the second hollow jack;

[0028] Figure 4 It is a schematic diagram of the connection between the pressure plate and the connecting column;

[0029] Figure 5 It is a structural schematic diagram of the limit plate pushing assembly;

[0030] Figure 6for Figure 5 sectional view of

[0031] Figure 7 It is a cross-sectional view of the limit reaction support;

[0032] Figure 8 It is a cross-sectional view of the position limiting reaction force support of the second embodiment;

[0033] In the figure: working anchor 1, working clip 2, hollow jack 3, tool anchor plate 4, limit plate push assembly 5, limit reaction support 6, O-ring 7, V-ring 8, pressure plate 9, connecting column 10, first piston rod 31, first cylinder body 32, second piston rod 51, second cylinder body 52, observation hole 61, support body 62, docking groove 63, internal thread groove 64, adjustable limit ring 65, external thread groove 66, first limit boss 101, second limit boss 102, limit groove 103, gasket 104, strip hole 511, inner cylinder body 521, outer cylinder body 522, anchor cable 200, slope 300. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the embodiments, but the implementation manner of the present invention is not limited thereto.

[0035] Embodiment 1:

[0036] The utility model provides a non-destructive tensioning hydraulic limiting device: its structure includes a working anchor 1, a working clip 2, a hollow jack 3, a tool anchor plate 4, a limiting plate pushing assembly 5 and a pressure plate 9, the hollow jack 3 includes a first piston rod 31 and a first cylinder 32; the working anchor 1 and the tool anchor plate 4 are provided with through holes allowing the anchor cable to pass through, and the working clip 2 is placed in the through holes. The hollow jack 3 can adopt an existing single-acting hydraulic hollow jack, and the working anchor 1, the working clip 2, and the tool anchor plate 4 are the same as those used in the existing tensioning device, and in this application, their structure and principle are no longer described in detail.

[0037] like Figure 5 and Figure 6 As shown, the limit plate pushing assembly 5 includes a second piston rod 51 and a second cylinder body 52, and the second cylinder body 52 includes an inner cylinder body 521 and an outer cylinder body 522. The second piston rod 51 and the inner cylinder body 521 and the outer cylinder body 522 are sealed by an O-ring 7 and a V-ring 8, and the inner cylinder body 521 is provided with an oil inlet channel 5211 and an oil outlet channel (not shown in the figure), and the second piston rod 51 moves by the change of the sealed volume formed by the oil in the cylinder body.

[0038] like Figure 1 and Figure 2As shown, a limiting reaction force support 6 is provided on the second cylinder body 52. ​​The limiting reaction force support 6 is hollow cylindrical as a whole, and the working anchor 1 is covered inside the limiting reaction force support 6; the pressure plate 9 is arranged inside the limiting reaction force support 6 and is located on the side where the working anchor 1 is assembled with the working clamp 2.

[0039] like Figure 3 and Figure 4 As shown, the pressure plate 9 is provided with a plurality of notches 91 for passing the anchor cables respectively.

[0040] Since the number and position of the anchor cables to be tensioned may be different in different occasions, it is necessary to make different pressure plates 9 that match the anchor cable combinations to be tensioned. In order to achieve quick connection between different pressure plates 9 and the limit plate pushing assembly 5, more than two connecting columns 10 are provided on the pressure plate 9. The pressure plate 9 is connected to the second piston rod 51 through the connecting columns 10. In this embodiment, the number of connecting columns 10 is 3.

[0041] One end of the connecting column 10 is connected to the pressing plate 9. In the present embodiment, the connecting column 10 is provided with an external thread, and the pressing plate 9 is provided with a threaded hole connected to the external thread. The connecting column 10 is tightened onto the pressing plate 9 through threaded cooperation.

[0042] In this embodiment, the other end of the connecting column 10 is provided with a first limiting boss 101 and a second limiting boss 102, and a limiting groove 103 is provided between the first limiting boss 101 and the second limiting boss 102; the outer diameter of the first limiting boss 101 is smaller than that of the second limiting boss 102, and the second piston rod 51 is provided with a strip hole 511, and one end of the strip hole 511 is provided with a matching hole 512 allowing the first limiting boss 101 to pass through, and the diameter of the matching hole 512 is smaller than the diameter of the second limiting boss 102; during installation, the first limiting boss 101 of the connecting column 10 in the pressing plate 9 on which the connecting column 10 is installed is extended into the quasi-matching hole 512, and during insertion, the second limiting boss 102 can be limited, which is convenient for the limiting stability of the connecting column 10 after insertion, and then the pressing plate 9 is rotated clockwise to make the limiting groove 103 of the connecting column 10 snap into the strip hole 511, thereby realizing the connection between the pressing plate 9 and the second piston rod 51, and the second as Figure 3 As shown, during disassembly, the pressing plate 9 only needs to be rotated counterclockwise to allow the limiting groove 103 of the connecting column 10 to fall into the matching hole 512, thereby realizing the separation of the pressing plate 9 and the second piston rod 51.

[0043] In order to further make the connection between the connecting column 10 and the second piston rod 51 more secure, a gasket 104 is provided on the lower surface of the second limiting boss 102. The gasket 104 is made of a wear-resistant material with a certain flexibility such as rubber. The gasket 104 is compressed during connection. The rebound force of the gasket 104 increases the friction between the gasket 104 and the upper surface of the second piston rod 51 when the pressure plate 9 is rotated, thereby further making the connection between the connecting column 10 and the second piston rod 51 more secure.

[0044] The limiting reaction force support 6 is composed of an observation hole 61, a support body 62, a docking groove 63, an internal thread groove 64, an adjustable limiting ring 65 and an external thread groove 66. The support body 62 is provided with an observation hole 61 on the upper side, and a docking groove 63 is provided on the upper side of the inner ring end of the support body 62. The support body 62 is combined with the boss structure of the second cylinder body through the docking groove 63. The support body 62 is provided with an internal thread groove 64 on the lower side of the inner ring end, and the outer ring end of the adjustable limiting ring 65 is provided with an external thread groove 66. The adjustable limiting ring 65 is threadedly connected to the internal thread groove 64 of the support body 62 through the external thread groove 66. The adjustable limiting ring 65 is used for limiting the working anchor.

[0045] The inner ring diameter of the adjustable limiting ring 65 is larger than the diameter of the pressure plate 9 , so that the pressure plate 9 can pass through the inner ring end of the adjustable limiting ring 65 . The inner ring diameter of the adjustable limiting ring 65 is smaller than the maximum diameter of the working anchor 1 .

[0046] In order to facilitate observation of the status of the working clamp 2 and the like during the tensioning process, in the present embodiment, a plurality of observation holes 61 are provided on the outer wall of the position limiting reaction force support 6 .

[0047] The working process of the utility model is as follows:

[0048] First, the device of the utility model is as follows Figure 1 As shown, it is installed on the anchor cable 200 to be tensioned on the slope 300. During installation, the position of the adjustable limit ring 65 is adjusted by rotating so that the adjustable limit ring 65 can limit the working anchor 1 when the limit reaction force support 6 is pressed against the slope 300, so as to prevent the working anchor 1 from moving with the tensioning during the subsequent tensioning process, resulting in a pullback after the tensioning is completed, thereby causing inaccurate tension stress. Then, the anchor cable 200 is fixed to the outer end of the first piston rod 31 of the hollow jack 3 by using the tool anchor plate 4 and the working clamp 2, and the hollow jack 3 is started for tensioning;

[0049] After being tensioned into place, the limit plate push assembly 5 is started, and the pressure plate 9 is used to push the working clamp 2 placed in the through hole of the tool anchor plate 4, and the working clamp 2 is clamped in the tool anchor plate 4 to achieve locking of the anchor cable 200.

[0050] During the tensioning process of the anchor cable 200, the working clamp 2 matched with the through hole in the working anchor 1 is loosely sleeved on the anchor cable 200, and will not wear against the anchor cable 200, thereby effectively preventing the problem of damage to the internal thread of the working clamp 2 and the anchor cable 200 in the traditional tensioning device during the tensioning process of the anchor cable, thereby preventing the problem of prestress loss easily caused in the process of locking the anchor cable 200 after the internal thread of the working clamp 2 is damaged. At the same time, the method of actively locking the working clamp 2 after tensioning is in place also ensures that there will be no stress loss due to pullback after the tensioning of the device is completed, thereby ensuring the accuracy of the tensioning stress. The device adopts a combined structure that can be easily separated, so that when a single component is damaged or the model of the working anchor 1 required for the slope is different, the device can be quickly replaced and used as a single component, avoiding the inconvenience of replacing the entire component.

[0051] Embodiment 2:

[0052] With the rest of the structure and effects unchanged, the inner ring end of the adjustable limit ring 65 of the present application adjacent to the working anchor 1 can be set as a slope gradually inclined toward the external thread groove 66, so that the adjustable limit ring 65 can be sleeved on working anchors 1 of different sizes for top pressure, and can perform side limiting to ensure centering and stability during use.

[0053] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0054] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A non-destructive tensioning hydraulic limit device, which structure includes a working anchor, a working clip, a hollow jack and a tool anchor plate, wherein the working anchor and the tool anchor plate are both provided with through holes allowing the anchor cable to pass through, the working clip is placed in the through holes, the hollow jack includes a first piston rod and a first cylinder body, the tool anchor plate is assembled on the side of the first piston rod away from the first cylinder body, and the hollow jack is used to press the tool anchor plate away from the working anchor, characterized in that: It also includes a limit plate pushing assembly, a pressure plate and a limit reaction force support, the limit plate pushing assembly is assembled in reverse with the hollow jack, the limit plate pushing assembly is equipped with a pressure plate on the side away from the hollow jack, the limit reaction force support is hollow cylindrical as a whole, one end of the limit reaction force support covers the working anchor inside, the limit plate pushing assembly includes a second piston rod and a second cylinder body, the second cylinder body is away from the second piston rod end and is in contact with the first cylinder body away from the first piston rod side, the second cylinder body is provided with a boss structure provided at the second piston rod end and combined with the limit reaction force support, the other end of the limit reaction force support is covered and sleeved on the boss structure of the second cylinder body, the second piston rod and the pressure plate are arranged in the limit reaction force support, and the second piston rod is equipped with a pressure plate on the side away from the second cylinder body; The limit plate pushes the assembly to lock the anchor cable by pressing the working clip of the working anchor through the pressure plate.

2. A non-destructive tension hydraulic limit device according to claim 1, characterized in that: The outer diameter of the limit plate pushing assembly is greater than the inner diameter of the hollow jack.

3. The non-destructive tension hydraulic limit device according to claim 1, characterized in that: The limiting reaction force support consists of an observation hole, a support body, a docking groove, an internal thread groove, an adjustable limiting ring and an external thread groove. The support body is provided with an observation hole on the upper side, and a docking groove is provided on the upper side of the inner ring end of the support body. The support body is combined with the boss structure of the second cylinder body through the docking groove. The support body is provided with an internal thread groove on the lower side of the inner ring end, and the outer ring end of the adjustable limiting ring is provided with an external thread groove. The adjustable limiting ring is threadedly connected to the internal thread groove of the support body through the external thread groove, and the adjustable limiting ring is used for limiting the working anchor.

4. The non-destructive tension hydraulic limit device according to claim 1, characterized in that: The pressure plate is provided with an equal number of notches for passing anchor cables according to the through holes of the working anchor and the tool anchor plate.

5. The non-destructive tension hydraulic limit device according to claim 1, characterized in that: The pressure plate is provided with more than two connecting columns, and the pressure plate is assembled on the second piston rod through the connecting columns.

6. A non-destructive tension hydraulic limit device according to claim 5, characterized in that: One end of the connecting column is connected to the pressing plate, and the other end of the connecting column is provided with a first limiting boss and a second limiting boss, and a limiting groove is provided between the first limiting boss and the second limiting boss.

7. A non-destructive tension hydraulic limiter according to claim 6, characterized in that: The diameter of the first limiting boss is smaller than the diameter of the second limiting boss.

8. The non-destructive tension hydraulic limit device according to claim 6, characterized in that: The second piston rod is provided with a strip hole with a convex cross-section, the smaller side of the strip hole passes through the second piston rod, and one end of the strip hole is provided with a matching hole allowing the first limiting boss to be inserted into.

9. The non-destructive tension hydraulic limit device according to claim 8, characterized in that: The minimum spacing of the strip holes is between the diameter of the connecting column and the diameter of the first limiting boss, the maximum spacing of the strip holes is greater than the diameter of the first limiting boss, and the diameter of the matching hole is between the diameter of the first limiting boss and the diameter of the second limiting boss.

10. The non-destructive tension hydraulic limit device according to claim 6, characterized in that: A gasket is arranged on the side of the second limiting boss adjacent to the first limiting boss.

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