Prestress detecting and adjusting device for existing short-tail anchor cable

Abstract

The invention provides a prestress detection and adjustment device for an existing short-tail anchor cable. The prestress detection and adjustment device comprises a tensioning assembly, a plurality of tensioning anchors, a tensioning plate, a jack and a force measurement assembly. The tensioning plate is arranged on a piston rod of the jack, the multiple tensioning anchors are arranged on the periphery of the jack in the circumferential direction of the jack, one ends of the multiple tensioning anchors are connected to the tensioning assembly, the other ends of the multiple tensioning anchors are connected to the tensioning plate, and the tensioning assembly, the jack and the tensioning plate are coaxially arranged and coincide with the central axis where all the tensioning anchors are arranged. The force measuring assembly is arranged below the tensioning assembly, and the top of the force measuring assembly makes contact with the bottom of the tensioning assembly. The prestress of the existing short-tail anchor cable can be monitored in real time through the force measuring assembly, tensioning force is provided through the jack, secondary tensioning of the existing short-tail anchor cable is achieved through the matched force transmission effect of the tensioning plate, the tensioning anchor piece and the tensioning assembly, the original structure of the existing short-tail anchor cable is not damaged through tensioning construction, operation is convenient and fast, and application is easy.

Description

Technical Field

[0001] The invention belongs to the technical field of anchor cable fastening, and in particular relates to a prestressed stress detection and adjustment device for an existing short-tail anchor cable. Background Art

[0002] Low-rebound anchor cables are widely used in slope protection structures due to their low cost, effective support, ease of operation, wide application range, and minimal construction space. Over time, existing short-tail anchor cables can experience significant loss of prestress due to factors such as slope deformation or strand creep. In these cases, a secondary tensioning of the prestressed cables is necessary to restore the designed prestress and ensure project stability and safety. However, the exposed ends of some primary-tensioned anchor cables are relatively short (as short as 30 mm), making conventional secondary tensioning equipment and methods incapable of stretching such short short-tail anchor cables.

[0003] Currently, the existing public anchor cable secondary tensioning technologies can only tension a single anchor cable, or have high space requirements and cannot tension shorter existing short-tail anchor cables, or lack force measuring devices, and cannot meet the needs of stable tensioning and real-time monitoring of existing shorter anchor cables. Summary of the Invention

[0004] The purpose of the present invention is to provide a device for detecting and adjusting the prestress of an existing short-tail anchor cable, which can at least solve some of the defects existing in the prior art.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An existing short-tail anchor cable prestress detection and adjustment device is used for performing secondary tensioning on an existing short-tail anchor cable extending out of an existing anchor plate, comprising a tensioning assembly for sleeved and fixed existing short-tail anchor cables, a plurality of tensioning anchors, a tensioning plate, a jack, and a force measuring assembly for detecting the prestress of existing short-tail anchor cables; the tensioning plate is placed on the piston rod of the jack, a plurality of the tensioning anchors are arranged on the periphery of the jack along the circumference of the jack, and one end of a plurality of the tensioning anchors is connected to the tensioning assembly, and the other end is connected to the tensioning plate; the tensioning assembly, the jack, and the tensioning plate are coaxially arranged and coincide with the central axis of the arrangement of all the tensioning anchors; the force measuring assembly is arranged below the tensioning assembly, and the top of the force measuring assembly is in contact with the bottom of the tensioning assembly.

[0007] Furthermore, the tensioning assembly includes a tensioning disk and a connecting disk. The tensioning disk has a middle circular hole in the middle for the connecting disk to pass through. The bottom of the connecting disk is provided with a plurality of tapered holes for the existing short-tail anchor cables to pass through. The tapered holes are provided with working clips for fixing the existing short-tail anchor cables. The tensioning disk and the connecting disk are detachably and fixedly connected.

[0008] Furthermore, the outer edge of the tensioning disk is provided with a plurality of first through grooves for fixing the tensioning anchor at equal intervals along its circumference, and the first through grooves are arranged along the radial extension of the tensioning disk; the lower end of the tensioning anchor has a limiting structure that cooperates with the first through grooves.

[0009] Furthermore, a positioning groove for positioning and installing the force measuring component is provided at the bottom of the tensioning disk.

[0010] Furthermore, the outer edge of the tensioning plate is provided with a plurality of second through grooves for fixing the tensioning anchor at equal intervals along its circumference, and the bottom center of the tensioning plate has a limiting portion for connecting with the piston rod of the jack; the upper end of the tensioning anchor has a limiting structure that cooperates with the second through groove.

[0011] Furthermore, the above-mentioned existing short tail anchor cable prestressed stress detection and adjustment device also includes a bracket assembly for supporting the jack.

[0012] Furthermore, the bracket assembly includes a connecting upper plate, a connecting bottom plate and a connecting column, the connecting column is supported between the connecting upper plate and the connecting bottom plate, the connecting bottom plate is placed on the periphery of the force measuring assembly, and the connecting upper plate is provided with a circular ring for limiting the jack.

[0013] Furthermore, the outer edge of the connecting upper plate is provided with a plurality of third through grooves at equal intervals along its circumference for limiting the tension anchor.

[0014] Furthermore, a plurality of guide rods are provided between the bracket assembly and the tensioning plate, and the guide rods are arranged at equal intervals along the circumference of the tensioning plate. The upper ends of the guide rods are fixed to the bottom of the tensioning plate, and the bracket assembly is provided with guide holes for the lower ends of the guide rods to pass through.

[0015] Furthermore, the force measuring assembly includes a sensor base plate and several weighing sensors. The sensor base plate is an annular plate. The sensor base plate is placed on the outside of the existing anchor plate. Several weighing sensors are placed on the sensor base plate at equal intervals along the circumference of the sensor base plate. The top of the weighing sensor is in contact with the bottom of the tensioning assembly.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The existing short-tail anchor cable prestress detection and adjustment device provided by the present invention can monitor the prestress of the existing short-tail anchor cable in real time through the force measuring component, and use the jack to provide tensioning force. Through the tensioning plate, tensioning anchor, and tensioning component, the tensioning of the existing short-tail anchor cable is achieved through the coordinated force transmission effect. The tensioning construction does not destroy the original structure of the existing short-tail anchor cable, and the operation is convenient and fast, and the application is simple.

[0018] The present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the existing short tail anchor cable prestress detection and adjustment device of the present invention;

[0020] Figure 2 1 is a schematic diagram of the upper surface structure of the tensioning assembly in an embodiment of the present invention;

[0021] Figure 3 1 is a schematic diagram of the bottom structure of the tensioning assembly in an embodiment of the present invention;

[0022] Figure 4 2 is a schematic structural diagram of a tensioning plate according to an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of connecting the upper plate in an embodiment of the present invention;

[0024] Figure 6 Schematic diagram of the structure of the weighing sensor in the embodiment of the present invention.

[0025] Explanation of the accompanying reference numerals: 1. Tensioning plate; 2. Jack; 3. Tensioning anchor; 4. Connecting upper plate; 5. Connecting column; 6. Connecting bottom plate; 7. Sensor bottom plate; 8. Weighing sensor; 9. Tensioning assembly; 10. Tensioning plate; 11. Connecting plate; 12. Conical hole; 13. First through groove; 14. Positioning groove; 15. Limiting portion; 16. Second through groove; 17. Guide rod; 18. Ring; 19. Third through groove; 20. Load-bearing bolt; 21. Adjusting gasket. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect" and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a conflicting connection or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features; in the description of the present invention, unless otherwise specified, "plurality" or "several" means two or more.

[0030] like Figure 1 As shown, this embodiment provides a device for detecting and adjusting the prestress of an existing short-tail anchor cable, which is used to perform secondary tensioning on an existing short-tail anchor cable extending from an existing anchor plate. The device comprises a tensioning assembly 9 for sleevedly securing the existing short-tail anchor cable, a plurality of tensioning anchors 3, a tensioning plate 1, a jack 2, and a force measuring assembly for detecting the prestress of the existing short-tail anchor cable. The tensioning plate 1 is placed on the piston rod of the jack 2. The tensioning anchors 3 are arranged circumferentially around the jack 2, with one end of the tensioning anchors 3 connected to the tensioning assembly 9 and the other end connected to the tensioning plate 1. The tensioning assembly 9, jack 2, and tensioning plate 1 are coaxially arranged and coincide with the central axis of the arrangement of all tensioning anchors 3. The force measuring assembly is disposed below the tensioning assembly 9, with the top of the force measuring assembly in contact with the bottom of the tensioning assembly 9. The tensioning anchors 3 can be tensioning anchor cables or tensioning anchor rods.

[0031] In this embodiment, the prestress of the existing short-tail anchor cable is monitored in real time by a force-measuring assembly. When the prestress of the existing short-tail anchor cable does not meet the required value, the tensioning assembly 9 connects the existing short-tail anchor cable and the tensioning anchor 3. A tensioning force is applied to the tensioning anchor 3 by the jack 2, thereby achieving a secondary tensioning of the existing short-tail anchor cable, restoring its designed prestress value. Specifically, during tensioning, hydraulic oil is introduced into the lower portion of the hollow jack 2, causing the piston rod of the jack 2 to move upward, driving the tensioning plate 1 upward, and in turn driving the tensioning anchor 3 connected to the tensioning plate 1 upward. Since the lower end of the tensioning anchor 3 is connected to the tensioning assembly 9, the tensioning anchor 3 stretches the tensioning assembly 9 upward. As the tensioning assembly 9 rises, the existing short-tail anchor cable is subjected to an upward tensioning force, ultimately completing the tensioning. In addition, in this embodiment, the tension anchor 3 is designed to be arranged on the periphery of the jack and does not need to extend from the center hole of the jack 2, which greatly simplifies the installation process. Moreover, the tension anchor 3 can adopt a straight structure without bending, is easy to process, and has high transmission efficiency.

[0032] As a specific embodiment, the force measuring assembly includes a sensor base plate 7 and a plurality of weighing sensors 8. The sensor base plate 7 is an annular plate. The sensor base plate 7 is placed outside the existing anchor plate. The plurality of weighing sensors 8 are placed on the sensor base plate 7 at equal intervals along the circumference of the sensor base plate 7. The top of the weighing sensor 8 contacts the bottom of the tensioning assembly 9. In some embodiments, as Figure 6 As shown, the load cell 8 is a hollow cylindrical structure, with a force-bearing bolt 20 and an adjustment washer 21 inserted and connected to the hollow portion. The head of the force-bearing bolt 20 contacts the bottom of the tensioning assembly 9, acting as a support for the tensioning force. The number of adjustment washers 21 can be increased or decreased depending on the actual height of the lower surface of the tensioning assembly 9 from the ground. In this embodiment, three to four load cells 8 are sufficient to support the tensioning assembly 9.

[0033] As a specific implementation method, Figure 2 and Figure 3 As shown, the tensioning assembly 9 includes a tensioning disk 10 and a connecting disk 11. The tensioning disk 10 has a middle circular hole in the middle for the connecting disk 11 to pass through. The bottom of the connecting disk 11 is provided with a plurality of tapered holes 12 for the existing short-tail anchor cable to pass through, wherein the number and position of the tapered holes 12 are consistent with the tapered holes in the existing anchor disk. A working clip (not shown in the figure) is provided in the tapered hole 12. The existing short-tail anchor cable passes through the working clip and is connected to the existing short-tail anchor cable by relying on the internal texture of the working clip, thereby fixing the existing short-tail anchor cable to the connecting disk 11; the tensioning disk 10 and the connecting disk 11 are detachably and fixedly connected, thereby connecting the existing short-tail anchor cable to the tensioning assembly 9 as a whole, and the tensioning anchor 3 is connected to the tensioning disk 10, and the tensioning anchor 3 is used to stretch the tensioning disk 10 upward, driving the connecting disk 11 to stretch upward, so that the existing short-tail anchor cable is subjected to an upward tensioning force to complete the tensioning. In this embodiment, the tensioning disk 10 and the connecting disk 11 are set as a split structure, which can facilitate manufacturing on the one hand, and on the other hand, different connecting disks 11 can be replaced for different numbers of existing short tail anchor cables, thereby increasing the applicability of the tensioning assembly 9 and reducing costs.

[0034] Regarding the detachable connection between the connecting disk 11 and the tensioning disk 10, in some embodiments, a lug extending radially outward can be provided on the outer edge of the top of the connecting disk 11. The lug can be an annular plate extending along the entire circumference of the connecting disk 11, or it can be a plurality of connecting blocks equidistantly spaced along the circumference of the connecting disk 11. The lug is integrally formed with the connecting disk 11. When the connecting disk 11 is installed, the lower portion of the connecting disk 11 passes through the central circular hole of the tensioning disk 10, and the lug at the edge of the connecting disk 11 is hooked onto the edge of the central circular hole. In this way, when the tensioning disk 10 is pulled upward by the tensioning anchor 3, the edge of the central circular hole of the tensioning disk 10 exerts an upward force on the lug of the connecting disk 11, thereby driving the connecting disk 11 to be stretched upward. Preferably, to ensure that the connecting disk 11 does not rotate circumferentially during the upward stretching process, a limiting structure can be adopted between the lug and the edge of the central circular hole, but is not limited to a keyway and a key.

[0035] Regarding the connection between the tension anchor 3 and the tensioning disk 10, in some embodiments, a plurality of first through-slots 13 can be provided at equal intervals along the circumference of the outer edge of the tensioning disk 10, and the first through-slots 13 are arranged along the radial extension of the tensioning disk 10; the lower end of the tension anchor 3 passes through the first through-slots 13 of the tensioning disk 10, and each first through-slot 13 passes through a corresponding tension anchor 3. At the same time, the lower end of the tension anchor 3 has a limiting structure that cooperates with the first through-slot 13. When the tension anchor 3 pulls the tensioning disk 10 upward, the limiting structure of the tension anchor 3 acts on the tensioning disk 10, generating an upward pulling force; specifically, when the tension anchor 3 is a tensioning anchor cable, the limiting structure can be an extrusion head, and when the tension anchor 3 is a tensioning anchor rod, the limiting structure can be a nut. Preferably, in order to reduce the friction between the limiting structure and the tensioning disk 10, a washer can be provided between the limiting structure and the tensioning disk 10.

[0036] Correspondingly, for the connection between the upper end of the tension anchor 3 and the tension plate 1, Figure 4 As shown, a plurality of second through grooves 16 can be provided at equal intervals along the circumference of the outer edge of the tensioning plate 1 for fixing the tensioning anchor 3. The second through grooves 16 are arranged one-to-one with the first through grooves 13. The upper end of the tensioning anchor 3 passes through the second through groove 16 of the tensioning plate 1. Each second through groove 16 passes through a tensioning anchor 3. At the same time, the upper end of the tensioning anchor 3 has a limiting structure that cooperates with the second through groove 16. Specifically, when the tensioning anchor 3 is a tensioning anchor cable, the limiting structure can adopt an extrusion head, and when the tensioning anchor 3 is a tensioning anchor rod, the limiting structure can adopt a nut; when the jack 2 drives the tensioning plate 1 to move upward, the tensioning plate 1 generates an upward force on the limiting structure at the upper end of the tensioning anchor 3, thereby stretching the tensioning anchor 3.

[0037] Specifically, in this embodiment, only four tensioning anchors 3 can be provided to perform tensioning around the tensioning disk 10 and the tensioning plate 1. Accordingly, four first through slots 13 and four second through slots 16 are provided respectively, so the number of tensioning anchors is small and the installation is convenient.

[0038] Preferably, the bottom center of the tensioning plate 1 has a limiting portion 15 for connecting to the piston rod of the jack 2. The limiting portion 15 can be but is not limited to a circular tube structure and can be inserted into the air inside the hollow jack 2 to ensure that the tensioning plate 1 and the jack 2 are aligned and the connection is firm.

[0039] Optionally, a positioning groove 14 for positioning and installing the force measuring component is provided at the bottom of the tensioning disk 10; specifically, when the force measuring component is a cylindrical weighing sensor 8, the head of the force bolt 20 of the weighing sensor 8 is embedded in the positioning groove 14 and installed concentrically with the positioning groove 14 to ensure that the weighing sensor 8 is accurately positioned and the upper surface of the head of the force bolt 20 is in contact with the lower surface of the positioning groove 14 to bear the tensioning force.

[0040] In an optional embodiment, the existing short-tail anchor prestressed detection and adjustment device of this embodiment further includes a bracket assembly for supporting the jack 2 to ensure the stability of the installation of the jack 2. In some embodiments, as Figure 1 and Figure 5 As shown, the bracket assembly includes a connecting upper plate 4, a connecting bottom plate 6 and a connecting column 5. The connecting column 5 is supported between the connecting upper plate 4 and the connecting bottom plate 6. The connecting bottom plate 6 is placed on the periphery of the force measuring assembly. The connecting upper plate 4 is provided with a circular ring 18 for limiting the jack 2. The jack 2 is forced to be centered by the circular ring 18, thereby ensuring that the tensioning force on the tensioning plate 10 is uniform, thereby ensuring the accuracy of the prestressing detection and adjustment of the existing short tail anchor cable.

[0041] Preferably, the outer edge of the connecting upper plate 4 is provided with a plurality of third through grooves 19 at equal intervals along its circumference, and the tensioning anchor 3 is further limited by the third through grooves 19 to ensure the stability of the tensioning anchor 3 during the upward movement; in addition, the tensioning anchor 3 passes through the edge of the connecting upper plate 4, which is more convenient to install than the tensioning anchor 3 passing through the middle of the connecting upper plate 4. Moreover, in order to make the tensioning anchor 3 easier to install, the structural form in which the tensioning anchor 3 passes through the middle of the connecting upper plate 4 requires the connection column 5 to be higher, resulting in a higher height of the entire bracket assembly, and thus a higher overall center of gravity, and the jack 2 is not easy to align. In this embodiment, the tensioning anchor 3 is designed to pass through the edge of the connecting upper plate 4, which can reduce the total height of the bracket assembly and the total center of gravity of the device, thereby making the jack 2 easier to align.

[0042] Optimized, such as Figure 1 and Figure 4As shown, a plurality of guide rods 17 are provided between the bracket assembly and the tensioning plate 1. The guide rods 17 can play a role of limiting and connecting the installation of the tensioning plate 1, and can also guide the movement of the jack 2 to lift the tensioning plate 1, thereby ensuring the stability of the movement of the tensioning plate 1. Specifically, a plurality of the guide rods 17 are arranged at equal intervals along the circumference of the tensioning plate 1, the upper ends of the guide rods 17 are fixed to the bottom of the tensioning plate 1, and the connecting upper plate 4 is provided with a guide hole for the lower end of the guide rod 17 to pass through.

[0043] In summary, the existing short-tail anchor cable prestress detection and adjustment device provided by the present invention can monitor the prestress of the existing short-tail anchor cable in real time through the force measuring component, and use the jack to provide tensioning force. Through the tensioning plate, tensioning anchor, and tensioning component, the secondary tensioning of the existing short-tail anchor cable is achieved, and the tensioning construction does not destroy the original structure of the existing short-tail anchor cable. The operation is convenient and fast, and the application is simple.

[0044] The above examples are merely illustrative of the present invention and do not limit the scope of protection of the present invention. Any design that is identical or similar to the present invention falls within the scope of protection of the present invention.

Claims

1. An existing short-tail anchor cable prestress detection and adjustment device is used to perform secondary tensioning on an existing short-tail anchor cable extending out of an existing anchor plate, and is characterized by: It comprises a tensioning assembly for sleeve-fixing an existing short-tail anchor cable, a plurality of tensioning anchors, a tensioning plate, a jack, and a force measuring assembly for detecting the prestress of the existing short-tail anchor cable; the tensioning plate is placed on the piston rod of the jack, a plurality of tensioning anchors are arranged on the periphery of the jack along the circumference of the jack, and one end of a plurality of tensioning anchors is connected to the tensioning assembly, and the other end is connected to the tensioning plate; the tensioning assembly, the jack, and the tensioning plate are coaxially arranged and coincide with the central axis of the arrangement of all tensioning anchors; the force measuring assembly is arranged below the tensioning assembly, and the top of the force measuring assembly is in contact with the bottom of the tensioning assembly.

2. The existing short-tail anchor cable prestress detection and adjustment device as claimed in claim 1, characterized in that: The tensioning assembly includes a tensioning disk and a connecting disk. The tensioning disk has a middle circular hole in the middle for the connecting disk to pass through. The bottom of the connecting disk is provided with a plurality of tapered holes for the existing short-tail anchor cables to pass through. The tapered holes are provided with working clips for fixing the existing short-tail anchor cables. The tensioning disk is detachably and fixedly connected to the connecting disk.

3. The existing short-tail anchor cable prestress detection and adjustment device as claimed in claim 2, characterized in that: The outer edge of the tensioning disk is provided with a plurality of first through grooves for fixing the tensioning anchor at equal intervals along its circumference, and the first through grooves are arranged along the radial extension of the tensioning disk; the lower end of the tensioning anchor has a limiting structure matched with the first through groove.

4. The existing short-tail anchor cable prestress detection and adjustment device as claimed in claim 2, characterized in that: A positioning groove for positioning and installing the force measuring component is provided at the bottom of the tensioning disk.

5. The existing short-tail anchor cable prestress detection and adjustment device as claimed in claim 1, characterized in that: The outer edge of the tensioning plate is provided with a plurality of second through grooves for fixing the tensioning anchor at equal intervals along its circumference, and the bottom center of the tensioning plate has a limiting portion for connecting with the piston rod of the jack; the upper end of the tensioning anchor has a limiting structure that cooperates with the second through groove.

6. The existing short-tail anchor cable prestress detection and adjustment device as claimed in claim 1, characterized in that: Also included is a bracket assembly for supporting the jack.

7. The existing short-tail anchor cable prestress detection and adjustment device as claimed in claim 6, characterized in that: The bracket assembly includes a connecting upper plate, a connecting bottom plate and a connecting column, the connecting column is supported between the connecting upper plate and the connecting bottom plate, the connecting bottom plate is placed on the periphery of the force measuring assembly, and the connecting upper plate is provided with a ring for limiting the jack.

8. The existing short-tail anchor cable prestress detection and adjustment device as claimed in claim 7, characterized in that: The outer edge of the connecting upper plate is provided with a plurality of third through grooves at equal intervals along its circumference for limiting the tension anchor.

9. The existing short-tail anchor cable prestress detection and adjustment device according to claim 6, characterized in that: A plurality of guide rods are provided between the bracket assembly and the tensioning plate, and the guide rods are arranged at equal intervals along the circumference of the tensioning plate. The upper ends of the guide rods are fixed to the bottom of the tensioning plate, and the bracket assembly is provided with guide holes for the lower ends of the guide rods to pass through.

10. The existing short-tail anchor cable prestress detection and adjustment device according to claim 1, characterized in that: The force measuring assembly includes a sensor base plate and a plurality of weighing sensors. The sensor base plate is an annular plate. The sensor base plate is placed on the outside of the existing anchor plate. The plurality of weighing sensors are placed on the sensor base plate at equal intervals along the circumference of the sensor base plate. The top of the weighing sensor is in contact with the bottom of the tensioning assembly.

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