Tensioning device of stay cable

Abstract

The utility model relates to the technical field of bridge maintenance and reinforcement, in particular to a stay cable tensioning device which comprises a tensioning rod, a back supporting mechanism and a tensioning mechanism. The reverse supporting mechanism comprises a supporting plate and a supporting assembly, the supporting plate comprises a first supporting plate and a second supporting plate, the supporting assembly comprises a plurality of supporting rods, the two ends of each supporting rod are connected with the first supporting plate and the second supporting plate respectively, and the tensioning mechanism is installed on the second supporting plate; the two ends of the tensioning rod are connected with the stay cable and the tensioning mechanism through a first supporting plate and a second supporting plate correspondingly. The multiple supporting rods are arranged at intervals along the periphery of the tensioning rod. And the tensioning mechanism drives the tensioning rod to tension the stay cable. The supporting device is high in supporting strength, long in service life and convenient to install.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge maintenance and reinforcement, and particularly relates to a tensioning device for stay cables. Background Art

[0002] As the main load-bearing member of a cable-stayed bridge, during the maintenance and replacement construction process of stay cables, a tensioning device is required to tension, release or apply cable force to them. By releasing the cable force of the stay cables, the old cables of the original bridge are removed, and the new cables are tensioned to apply cable force to bear the action of the bridge dead load and vehicle load. Traditional tensioning devices usually include a lower backing plate, an upper backing plate, a jack, a tensioning rod, a tensioning nut, a stay cable and a cable anchor, etc. The lower backing plate and the upper backing plate are respectively installed at both ends of the jack. The cable anchor is penetrated through the lower backing plate, and one end of the cable anchor is connected to the stay cable. One end of the tensioning rod is connected to the other end of the cable anchor, and the other end is penetrated through the upper backing plate and fixed on the upper backing plate through the tensioning nut. When the jack is filled with oil, the upper backing plate moves, increasing the distance between the lower backing plate and the upper backing plate. The tensioning rod moves under the action of the tensioning nut to tension the stay cable. During this process, the lower backing plate will receive a large reaction force. Generally, the lower backing plate is installed on the beam body, and the beam body is subjected to large forces and is easily damaged, so the supporting force is insufficient and it is difficult to achieve effective tensioning work. In addition, the positions among the jack, the tensioning rod and the cable anchor are prone to interference, which is not conducive to installation.

[0003] There are also existing ones with support feet arranged between the jack and the lower backing plate. However, some support feet are relatively small. Although they are convenient for installation and transportation, their strength is insufficient and it is difficult to effectively play a supporting role. There are also some support feet in an "n" - shaped structure, that is, two vertical plates are arranged oppositely, with a connecting plate at one end, the connecting plate connects the two vertical plates, and the other end is directly connected to the lower backing plate. This structure plays a certain supporting role, but the other two opposite sides are hollowed out, and only the support of the two vertical plates is still insufficient in strength. After long-term use, the two vertical plates are also prone to bending deformation and have a short service life. There are also some support feet in a cylindrical structure with a hollow interior. Although this structure can increase the strength of the support feet, it is not convenient for installation and transportation, and it is heavy and costly. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a tensioning device for stay cables, which has high support strength, a long service life and is convenient for installation.

[0005] To solve the above technical problem, the utility model provides a tensioning device for stay cables, which includes a tensioning rod, a reaction support mechanism and a tensioning mechanism;

[0006] The anti-bracing mechanism includes a support plate and a support assembly. The support plate includes a first support plate and a second support plate. The support assembly includes a number of support rods, and both ends of the support rods are respectively connected to the first support plate and the second support plate. The tensioning mechanism is installed on the second support plate;

[0007] Both ends of the tension rod are respectively connected to the stay cable and the tensioning mechanism through the first support plate and the second support plate; a number of the support rods are arranged at intervals along the outer periphery of the tension rod; the tensioning mechanism drives the tension rod to tension the stay cable.

[0008] As an improvement to the above solution, a number of the support rods are evenly distributed along the circumferential direction of the tension rod.

[0009] As an improvement to the above solution, a number of the support rods and the tension rod are arranged parallel to each other.

[0010] As an improvement to the above solution, the cross-sectional shape of the support rod is square, triangular, rhombic or circular.

[0011] As an improvement to the above solution, strengthening blocks are provided at the joints of the first support plate and the second support plate with the support rods respectively.

[0012] As an improvement to the above solution, the strengthening blocks are arranged at intervals and evenly distributed along the circumferential direction of the support rod.

[0013] As an improvement to the above solution, the ratio of the total cross-sectional area of a number of the support rods to the area of the support plate is 1:(2 - 10).

[0014] As an improvement to the above solution, the support rod is connected to the stay cable through a connection assembly;

[0015] The connection assembly includes an anchor and a connecting sleeve. The anchor is connected to the stay cable, the anchor passes through the first support plate, and the tension rod is connected to the anchor through the connecting sleeve.

[0016] As an improvement to the above solution, the tensioning mechanism includes a tensioning body and a piston sleeve movably connected to the tensioning body. The tensioning body is provided with a liquid cavity, the piston sleeve is inserted into the liquid cavity, and the other end of the support rod is fixedly connected to the piston sleeve.

[0017] As an improvement to the above solution, the tension rod passes through the second support plate and is fixedly connected to the piston sleeve through the liquid cavity;

[0018] A protective sleeve is provided in the liquid cavity. The protective sleeve is sleeved outside the tension rod, and the piston sleeve is sleeved outside the protective sleeve; the protective sleeve is fixedly connected to the tensioning body, and the tension rod and the piston sleeve are respectively movably connected to the protective sleeve.

[0019] Implementing the present utility model has the following beneficial effects:

[0020] The tensioning device of the stay cable of the present utility model is provided with a reaction support mechanism. The support plate and the support assembly cooperate. The first support plate and the second support plate are in contact and stressed, and the support rod connects and supports the first support plate and the second support plate. The tensioning rod is connected to the stay cable and the tensioning mechanism through the first support plate and the second support plate respectively, and the tensioning mechanism drives the tensioning rod to tension the stay cable. Among them, several support rods play a role of reaction force support, and several support rods are arranged at intervals along the outer circumference of the tensioning rod, with high support strength, long service life, and convenient installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a cross-sectional view of the tensioning device of the stay cable of the present utility model;

[0022] Figure 2 is a schematic structural diagram of the reaction support mechanism of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It is hereby declared that the orientation terms such as up, down, left, right, front, back, inside, and outside that appear or will appear in the text of the present utility model are only based on the drawings of the present utility model, and they do not specifically limit the present utility model.

[0024] See Figure 1-2 , the present utility model discloses a tensioning device for a stay cable 100, including a tensioning rod 9, a reaction support mechanism, and a tensioning mechanism, and the tensioning mechanism is used to drive the tensioning rod 9.

[0025] The reaction support mechanism includes a support plate and a support assembly. The support plate includes a first support plate 1 and a second support plate 2. The support assembly includes several support rods 3. The two ends of the support rod 3 are respectively connected to the first support plate 1 and the second support plate 2, and the tensioning mechanism is installed on the second support plate 2.

[0026] The two ends of the tensioning rod 9 are respectively connected to the stay cable 100 and the tensioning mechanism through the first support plate 1 and the second support plate 1; several of the support rods 9 are arranged at intervals along the outer circumference of the tensioning rod 9; the tensioning mechanism drives the tensioning rod 9 to tension the stay cable 100.

[0027] The tensioning device of the stay cable of the utility model is provided with a reaction support mechanism, which uses a support plate and a support component in cooperation. The first support plate and the second support plate are in contact and stressed, and the support rod connects and supports the first support plate and the second support plate. The tensioning rod is connected to the stay cable and the tensioning mechanism through the first support plate and the second support plate respectively, and the tensioning rod is driven by the tensioning mechanism to tension the stay cable. Among them, several support rods play a role of reaction force support, and several support rods are arranged at intervals along the outer circumference of the tensioning rod, with large support strength, long service life and convenient installation.

[0028] Preferably, the tensioning mechanism is a jack, but not limited thereto.

[0029] Preferably, several support rods 3 are arranged evenly along the circumferential direction of the tensioning rod 9, which is beneficial to the overall uniform force of the reaction support mechanism, with large support strength and long service life.

[0030] Preferably, several support rods 3 and the tensioning rod 9 are arranged parallel to each other, ensuring that the force directions of the support rod and the tensioning rod are in the same direction, effectively supporting the reaction force, with large support strength and long service life.

[0031] Preferably, the cross-sectional shape of the support rod 3 is square, triangular, rhombic or circular. More preferably, the cross-sectional shape of the support rod 3 is circular, which is beneficial to production, transportation and installation.

[0032] Preferably, as Figure 2 shown, strengthening blocks 4 are provided at the joints of the first support plate 1 and the second support plate 2 and the support rod 3 respectively. The setting of the strengthening blocks is beneficial to strengthening the connection strength between the support rod and the first support plate or the second support plate and the support force of the support rod. Among them, the shape of the strengthening block is triangular.

[0033] More preferably, the strengthening blocks 4 are arranged at intervals and evenly along the circumferential direction of the support rod 3, further strengthening the connection strength between the support rod and the first support plate or the second support plate and the support force of the support rod.

[0034] Preferably, the ratio of the total cross-sectional area of several support rods 3 to the area of the support plate is 1:(2 - 10). It should be noted that the first support plate 1 and the second support plate 2 have the same shape and size. Therefore, the support plate mentioned here refers to the first support plate or the second support plate. That is, the ratio of the total cross-sectional area of all support rods 3 to the area of the first support plate 1 or the second support plate 2 is 1:(2 - 10), which not only ensures that there is enough space for the tensioning rod to be installed and connected with the stay cable and the tensioning mechanism, but also ensures that the reaction support mechanism has enough support strength to bear the reaction force of tensioning. More preferably, the ratio of the total cross-sectional area of several support rods 3 to the area of the support plate is 1:(5 - 8).

[0035] Further, as Figure 1 shown, the support rod 3 is connected to the stay cable 100 through a connecting component; the connecting component includes an anchor 11 and a connecting sleeve 12. The anchor 11 is connected to the stay cable 100, the anchor 11 passes through the first support plate 1, and the tension rod 9 is connected to the anchor 11 through the connecting sleeve 12. The anchor is provided with a connecting groove which is provided with internal threads, the connecting sleeve is provided with external threads and internal threads, and the connecting sleeve is arranged in the connecting groove and is threadedly connected to the anchor. The tension rod is provided with external threads, and the tension rod is threadedly connected to the connecting sleeve. Therefore, the tension rod is connected to the anchor through the connecting sleeve. The tension rod is driven by a tensioning mechanism to drive the stay cable, thereby tensioning the stay cable. Specifically, as Figure 2 shown, the first support plate 1 is provided with a first connection hole 1a, and the anchor 11 passes through the first connection hole 1a.

[0036] Preferably, as Figure 1 shown, the connecting component further includes a limit sleeve 13. The limit sleeve 13 is sleeved outside the anchor 11 and is threadedly connected to the anchor 11. The limit sleeve 13 can be clamped on the first support plate 1 to position the anchor 11 on the first support plate 1. In the present utility model, the anchor can be positioned on the first support plate through the limit sleeve, so that the anchor is positioned at the optimal anchoring position to complete the permanent anchoring of the tower end of the stay cable.

[0037] Furthermore, as Figure 1 shown, the tensioning mechanism includes a tensioning body 5 and a piston sleeve 7 movably connected to the tensioning body 5. The tensioning body 5 is provided with a liquid cavity 6, the piston sleeve 7 is inserted into the liquid cavity 6, and the other end of the support rod 3 is fixedly connected to the piston sleeve 7. When oil enters the liquid cavity, the piston sleeve is pushed out of the tensioning body, driving the tension rod to move away from the stay cable to tension the stay cable.

[0038] Preferably, as Figure 1 shown, the tension rod 9 passes through the second support plate 2 and is fixedly connected to the piston sleeve 7 through the liquid cavity 6; a protective sleeve 8 is arranged in the liquid cavity 6. The protective sleeve 8 is sleeved outside the tension rod 9, and the piston sleeve 7 is sleeved outside the protective sleeve 8; the protective sleeve 8 is fixedly connected to the tensioning body 5, and the tension rod 9 and the piston sleeve 7 are respectively movably connected to the protective sleeve 8. The setting of the protective sleeve isolates the tension rod from the oil in the liquid cavity, preventing the tension rod from contacting the oil and being corroded. The piston sleeve is sleeved outside the protective sleeve, which not only enables the movable sleeve to slide along the protective sleeve to guide the movement of the movable sleeve, but also prevents oil from seeping into the gap between the protective sleeve and the tension rod, playing a certain sealing role. Specifically, as Figure 2 shown, the second support plate 1 is provided with a second connection hole 2a, and the tension rod 9 passes through the second connection hole 2a.

[0039] Preferably, as Figure 1 shown, the tension rod 9 and the piston sleeve 7 are fixedly connected through a tension sleeve 10. The tension sleeve is provided with an external thread, and the tension sleeve is threadedly connected to the tension rod to lock the tension rod onto the piston sleeve. A gasket is further provided between the piston sleeve and the tension sleeve, which is beneficial to locking the tension rod by the tension sleeve.

[0040] In summary, the present utility model provides a tensioning device for a stay cable, which has a large support strength, a long service life, and is convenient for installation.

[0041] The above is the preferred embodiment of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present utility model.

Claims

1. A tensioning device for a stay cable, characterized in that: It includes a tension rod, a back-support mechanism and a tension mechanism; The reverse support mechanism includes a support plate and a support assembly, the support plate includes a first support plate and a second support plate, the support assembly includes a plurality of support rods, both ends of the support rods are respectively connected to the first support plate and the second support plate, and the tensioning mechanism is installed on the second support plate; The two ends of the tension rod are connected to the inclined cable and the tensioning mechanism through a first support plate and a second support plate respectively; a plurality of the support rods are arranged at intervals along the outer circumference of the tension rod; and the tensioning mechanism drives the tension rod to tension the inclined cable.

2. The tensioning device for the inclined cable according to claim 1, characterized in that: A plurality of support rods are evenly distributed along the circumference of the tension rod.

3. The tensioning device for the inclined cable according to claim 1, characterized in that: A plurality of support rods and tension rods are arranged parallel to each other.

4. The tensioning device for a stay cable according to claim 1, characterized in that: The cross-sectional shape of the support rod is square, triangular, prismatic or circular.

5. The tensioning device for a stay cable according to claim 1, characterized in that: Reinforcement blocks are provided at the connection places between the first support plate and the second support plate and the support rod respectively.

6. The tensioning device for the inclined cable according to claim 5, characterized in that: The reinforcement blocks are spaced and evenly distributed along the circumference of the support rod.

7. The tensioning device for a stay cable according to claim 1, characterized in that: The ratio of the total cross-sectional area of ​​the plurality of support rods to the area of ​​the support plate is 1:(2-10).

8. The tensioning device for a stay cable according to claim 1, characterized in that: The support rod is connected to the inclined cable through a connecting assembly; The connecting assembly comprises an anchor and a connecting sleeve, the anchor is connected to the inclined cable, the anchor is passed through the first supporting plate, and the tension rod is connected to the anchor via the connecting sleeve.

9. The tensioning device for a stay cable according to claim 1, characterized in that: The tensioning mechanism comprises a tensioning body and a piston sleeve movably connected to the tensioning body, the tensioning body is provided with a liquid cavity, the piston sleeve is inserted in the liquid cavity, and the other end of the support rod is fixedly connected to the piston sleeve.

10. The tensioning device for a stay cable according to claim 9, characterized in that: The tension rod is disposed on the second support plate and is fixedly connected to the piston sleeve through the liquid cavity; A protective sleeve is arranged in the liquid cavity, the protective sleeve is arranged outside the tensioning rod, and the piston sleeve is arranged outside the protective sleeve; the protective sleeve is fixedly connected to the tensioning body, and the tensioning rod and the piston sleeve are movably connected to the protective sleeve respectively.

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