External prestress steel cable anchoring device for box girder

Abstract

The utility model relates to the technical field of box girder reinforcement, and discloses an external prestressing steel cable anchoring device for a box girder. The external prestress steel cable anchoring device for the box girder comprises a support capable of being installed on the box girder, a steel anchoring part, a supporting assembly and a steering pipe, the steel anchoring part, the supporting assembly and the steering pipe are arranged on the support, and the supporting assembly comprises a plurality of first supporting steel plates and second supporting steel plates in one-to-one correspondence with the first supporting steel plates; the first supporting steel plate and the second supporting steel plate are arranged on the two sides of the steel anchoring part respectively and fixedly connected with the steel anchoring part. The steering pipe is located at the end, away from the steel anchoring part, of the first supporting steel plate, and the external prestressed steel beam can penetrate through the steering pipe and be anchored to the steel anchoring part. The external prestress steel beam anchoring device for the box girder is small in dead weight and convenient to construct, the construction cost is reduced, the construction period is shortened, the additional weight borne by the box girder is obviously reduced, and the safety of the box girder structure is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of box girder reinforcement technology, and in particular relates to an external prestressed steel strand anchorage device for box girders. Background Technology

[0002] As a key load-bearing component of bridge structures, box girders are continuously subjected to multiple factors during long-term service, including vehicle dynamic loads, environmental erosion, and material aging. They commonly exhibit typical defects such as mid-span deflection and cracking, seriously threatening structural safety and reducing service performance. For cracking damage of varying degrees, engineering practice mainly employs repair techniques such as pressure grouting, steel plate bonding reinforcement, and external prestressing reinforcement. Among these, external prestressing reinforcement technology, by rationally arranging prestressed steel strands inside the box girder to construct a stress system that works collaboratively with the original structure, can effectively improve the structural stress performance and significantly enhance the stiffness, load-bearing capacity, and durability of the main girder.

[0003] Regarding the connection between external prestressed steel strands and box girders, current techniques typically involve casting concrete anchor blocks within the box girder and anchoring the prestressed steel strands within them to achieve prestress transfer. However, since box girders often contain multiple prestressed steel strands, the volume of the concrete anchor blocks is often significantly increased to meet anchorage requirements. This not only significantly increases construction costs and prolongs the construction period but also alters the stress state of the box girder due to the increased added mass, thus adversely affecting the overall structural performance.

[0004] Therefore, there is an urgent need for an external prestressed steel strand anchorage device for box girders to solve the above problems. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an external prestressed steel strand anchorage device for box girders, which can be applied to the bottom plate and top plate of box girders. It has a small self-weight and is easy to construct. It not only reduces construction costs and shortens the construction period, but also significantly reduces the additional weight on the box girder, thus ensuring the safety of the box girder structure.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] An external prestressed steel strand anchorage device for box girders is provided, comprising:

[0008] Supports can be installed on the bottom or top plate of the box girder;

[0009] Steel anchors are installed at the supports, and external prestressed steel strands can be anchored to the steel anchors.

[0010] A support assembly is provided on the support. The support assembly includes multiple first support steel plates and multiple second support steel plates. The first support steel plates and the second support steel plates are respectively provided on both sides of the steel anchor along its thickness direction. The multiple first support steel plates are symmetrically arranged along the extension direction of the steel anchor. The multiple second support steel plates correspond one-to-one with the multiple first support steel plates, and both the first support steel plates and the second support steel plates are fixedly connected to the steel anchor.

[0011] A steering tube is provided on the support and located at the end of the first supporting steel plate away from the steel anchor. A first through hole is provided at the end of the steering tube away from the steel anchor, and a second through hole is provided at the end of the steering tube facing the steel anchor. The heights of the first through hole and the second through hole are different. The external prestressed steel strands can enter the inner cavity of the steering tube through the first through hole and exit through the second through hole.

[0012] Optionally, the external prestressed steel strand anchoring device for the box girder also includes multiple anchor rods arranged in a matrix. The support includes a first connecting plate, and steel anchors are disposed on the first connecting plate. The first connecting plate can fit against the bottom plate or top plate of the box girder. The anchor rods pass through the first connecting plate and are anchored to the bottom plate or top plate of the box girder.

[0013] Optionally, the support also includes a concrete seat that can be installed on the bottom plate of the box girder. A first connecting plate is embedded in the top of the concrete seat, and an anchor rod passes through the first connecting plate and is anchored to the concrete seat, or the anchor rod passes through the first connecting plate and the concrete seat and is anchored to the bottom plate of the box girder.

[0014] Optionally, the external prestressed steel strand anchorage device for the box girder is set at the end of the box girder. The end of the box girder is provided with a transverse diaphragm. The external prestressed steel strand anchorage device for the box girder also includes a first pad, a second pad, and a plurality of tie members. The first pad can be attached to the side of the transverse diaphragm away from the second support steel plate. The second pad can be attached to the side of the transverse diaphragm facing the second support steel plate and is fixedly connected to the second support steel plate. The tie members pass through the first pad and the transverse diaphragm and are anchored to the second pad, or the tie members pass through the second pad and the transverse diaphragm and are anchored to the first pad.

[0015] Optionally, the support assembly also includes a second connecting plate, wherein a second connecting plate is provided between any two adjacent first support steel plates, one end of the second connecting plate is connected to one of the two adjacent first support steel plates, and the other end is connected to the other of the two adjacent first support steel plates.

[0016] Optionally, the support assembly may further include a plurality of first stiffening plates disposed on the first support steel plate, the plurality of first stiffening plates being arranged at intervals in the vertical direction, the first stiffening plates being perpendicular to the first support steel plate and extending along the extension direction of the first support steel plate.

[0017] Optionally, the support assembly also includes a plurality of second stiffening plates, which are arranged at intervals in the vertical direction. The first stiffening plate and the second stiffening plate are respectively located on both sides of the first support steel plate, and the second stiffening plate is parallel to the first stiffening plate.

[0018] Optionally, the support assembly may also include a plurality of third stiffening plates disposed on the first support steel plate. The plurality of third stiffening plates are arranged at intervals along the extension direction of the first support steel plate, and the third stiffening plates are perpendicular to the first support steel plate and extend in the vertical direction.

[0019] Optionally, the steel anchor includes a steel anchor plate and an anchoring disc disposed on the steel anchor plate. The steel anchor plate is fixedly connected to the support, and the anchoring disc is provided with anchoring holes. The external prestressed steel strands can pass through the anchoring holes and be clamped by the hole wall of the anchoring holes.

[0020] Optionally, the support is provided with multiple support seats, which are arranged at intervals along the extension direction of the steering tube. The support seats are provided with arc-shaped grooves, and the steering tube is locked in the arc-shaped grooves.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] This invention provides an external prestressed steel strand anchorage device for box girders. A support can be installed on the box girder, and steel anchors are placed on the support. The external prestressed steel strands can be anchored to the steel anchors, allowing the prestress of the external prestressed steel strands to be transferred to the box girder sequentially through the steel anchors and the support, thus completing the anchorage of the external prestressed steel strands on the box girder. Furthermore, the steel anchors are made of steel, which, compared to concrete, has a smaller self-weight while maintaining the same stiffness, and is easier to construct. This not only helps reduce construction costs and shorten the construction period but also significantly reduces the additional weight on the box girder when anchoring the external prestressed steel strands, ensuring the safety of the box girder structure. The support can be installed on the bottom or top slab of the box girder, allowing the prestress of the external prestressed steel strands to be transferred to any part of the box girder, ensuring the flexibility of the arrangement of the external prestressed steel strands on the box girder. The first and second support steel plates are respectively located on both sides of the steel anchor, and both are made of steel. This not only facilitates connection with the steel anchor and reduces the additional weight on the box girder, but also increases the stability and rigidity of the steel anchor on the support, ensuring that the steel anchor can withstand the prestress transmitted from the external prestressed steel strands without deformation, thus guaranteeing the robust connection between the external prestressed steel strands and the box girder. The different heights of the first and second perforations result in different heights of the external prestressed steel strands at both ends of the turning tube when passing through it. This changes the extension direction of the external prestressed steel strands, ensuring that they can extend horizontally between the turning tube and the steel anchor, facilitating the connection between the external prestressed steel strands and the steel anchor. Attached Figure Description

[0023] Figure 1 The front view of the external prestressed steel strand anchoring device for box girders provided by this utility model when installed on the bottom plate of the box girder;

[0024] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0025] Figure 3 A cross-sectional view of the external prestressed steel strand anchoring device for box girders provided by this utility model when installed on the bottom plate of the box girder;

[0026] Figure 4 A top view of the external prestressed steel strand anchoring device for box girders provided by this utility model when installed on the bottom plate of the box girder (with the second stiffening plate hidden);

[0027] Figure 5 The front view of the external prestressed steel strand anchoring device for box girders provided by this utility model when installed on the top plate of the box girder;

[0028] Figure 6 for Figure 5 Enlarged view at point B in the middle;

[0029] Figure 7 A cross-sectional view of the external prestressed steel strand anchorage device for box girders provided by this utility model when installed on the top plate of the box girder (with the third stiffening plate hidden);

[0030] Figure 8 A top view of the external prestressed steel strand anchoring device for box girders provided by this utility model when installed on the top plate of the box girder (with the second stiffening plate hidden);

[0031] Figure 9 This is a schematic diagram of the support seat for the external prestressed steel strand anchorage device for box girders provided by this utility model.

[0032] in:

[0033] 100. Box girder; 101. Bottom slab; 102. Top slab; 103. Diaphragm; 200. External prestressed steel strands;

[0034] 1. Support; 11. First connecting plate; 12. Concrete seat;

[0035] 2. Steel anchors;

[0036] 3. Support components; 31. First support steel plate; 32. Second support steel plate; 331. Second connecting plate; 332. First stiffening plate; 333. Second stiffening plate; 334. Third stiffening plate; 335. Fourth stiffening plate;

[0037] 4. Steering pipe;

[0038] 5. Anchor bolts;

[0039] 61. First pad; 62. Second pad; 63. Tie rod;

[0040] 7. Support seat; 71. Arc groove. Detailed Implementation

[0041] It should be understood that in the description of this utility model, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] It should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0044] like Figures 1 to 9 As shown, this embodiment provides an external prestressed steel strand anchorage device for box girders, which can be applied to the bottom plate 101 and top plate 102 of the box girder 100. It has a small self-weight and is easy to construct, which not only reduces construction costs and shortens the construction period, but also significantly reduces the additional weight on the box girder 100, thus ensuring the safety of the box girder 100 structure.

[0045] See Figure 2 , Figure 3 and Figure 6The external prestressed steel strand anchoring device for box girders includes a support 1, steel anchors 2, a support assembly 3, and a steering pipe 4. The support 1 can be installed on the bottom plate 101 or top plate 102 of the box girder 100. The steel anchors 2 are disposed on the support 1, and the external prestressed steel strands 200 can be anchored to the steel anchors 2. The support assembly 3 is disposed on the support 1 and includes multiple first support steel plates 31 and multiple second support steel plates 32. The first support steel plates 31 and the second support steel plates 32 are respectively disposed on both sides of the steel anchors 2 along their thickness direction. The multiple first support steel plates 31 extend along the length of the steel anchors 2. The plates are arranged symmetrically in the extension direction. Multiple second support steel plates 32 correspond one-to-one with multiple first support steel plates 31, and both the first support steel plates 31 and the second support steel plates 32 are fixedly connected to the steel anchors 2. The turning pipe 4 is set on the support 1 and located at the end of the first support steel plate 31 away from the steel anchor 2. The end of the turning pipe 4 away from the steel anchor 2 is provided with a first through hole, and the end of the turning pipe 4 facing the steel anchor 2 is provided with a second through hole. The height of the first through hole is different from the height of the second through hole. The external prestressed steel strand 200 can enter the inner cavity of the turning pipe 4 through the first through hole and exit through the second through hole.

[0046] The external prestressed steel strand anchoring device for box girders provided in this embodiment has a support 1 that can be installed on the box girder 100, and a steel anchor 2 that is set on the support 1. The external prestressed steel strand 200 can be anchored to the steel anchor 2, so that the prestress of the external prestressed steel strand 200 will be transferred to the box girder 100 in sequence through the steel anchor 2 and the support 1 to complete the anchoring of the external prestressed steel strand 200 on the box girder 100. Moreover, the steel anchor 2 is made of steel, which has a smaller self-weight than concrete while ensuring the same stiffness, and is easy to construct. It not only helps to reduce construction costs and shorten the construction period, but also significantly reduces the additional weight on the box girder 100 when anchoring the external prestressed steel strand 200, thus ensuring the structural safety of the box girder 100. Support 1 can be installed on the bottom plate 101 or top plate 102 of box girder 100, so that the prestress of external prestressed steel strands 200 can be transferred to any part of box girder 100, ensuring the flexibility of the arrangement of external prestressed steel strands 200 on box girder 100. The first support steel plate 31 and the second support steel plate 32 are respectively located on both sides of steel anchor 2, and are both made of steel. They not only facilitate the connection with steel anchor 2 and reduce the additional weight on box girder 100, but also increase the stability of steel anchor 2 installed on support 1 and the rigidity of steel anchor 2. This ensures that steel anchor 2 can withstand the prestress transferred to it by external prestressed steel strands 200 without deformation, ensuring the firmness of the connection between external prestressed steel strands 200 and box girder 100. The height of the first perforation is different from that of the second perforation, so that the height of the external prestressed steel strand 200 at both ends of the turning tube 4 is different when it passes through the turning tube 4. This achieves a change in the extension direction of the external prestressed steel strand 200, ensuring that the external prestressed steel strand 200 can extend horizontally between the turning tube 4 and the steel anchor 2, so as to facilitate the connection between the external prestressed steel strand 200 and the steel anchor 2.

[0047] For example, the steel anchor 2 is welded to the support 1, the first support steel plate 31 is welded to the steel anchor 2, and the second support steel plate 32 is welded to the steel anchor 2.

[0048] In this embodiment, see Figure 3 and Figure 4 The first supporting steel plate 31 and the second supporting steel plate 32 are both perpendicular to the support 1 and extend along the thickness direction of the steel anchor 2.

[0049] Optionally, see Figure 2 and Figure 6The external prestressed steel strand anchoring device for the box girder also includes multiple anchor rods 5 arranged in a matrix. The support 1 includes a first connecting plate 11, and steel anchors 2 are disposed on the first connecting plate 11. The first connecting plate 11 can fit against the bottom plate 101 or top plate 102 of the box girder 100. The anchor rods 5 pass through the first connecting plate 11 and are anchored to the bottom plate 101 or top plate 102 of the box girder 100 to realize the installation of the support 1 on the bottom plate 101 or top plate 102 of the box girder 100. The matrix arrangement of multiple anchor rods 5 can increase the connection points between the first connecting plate 11 and the box girder 100, thereby increasing the connection strength between the support 1 and the box girder 100 and ensuring the firmness of the support 1 installed on the box girder 100.

[0050] For example, the anchor rod 5 is a chemical anchor, and the first connecting plate 11 is a steel plate. The chemical anchor can form a chemical bond with the concrete of the box girder 100 through resin adhesive, which significantly improves the tensile strength between it and the box girder 100 and ensures the firmness of the support 1 installed on the box girder 100.

[0051] In this embodiment, see Figure 3 The support 1 also includes a concrete seat 12, which can be installed on the bottom plate 101 of the box girder 100. A first connecting plate 11 is embedded in the top of the concrete seat 12. Anchor rod 5 passes through the first connecting plate 11 and is anchored to the concrete seat 12, or anchor rod 5 passes through the first connecting plate 11 and the concrete seat 12 and is anchored to the bottom plate 101 of the box girder 100. The setting of the concrete seat 12 can change the height of the first connecting plate 11 on the box girder 100 to adjust the height between the steel anchor 2 and the turning pipe 4. On the one hand, it can ensure that the external prestressed steel strand 200 can remain horizontal between the second perforation and the steel anchor 2. On the other hand, it can avoid the height difference between the two ends of the external prestressed steel strand 200 being too large, and prevent the generation of prestress that is not conducive to reinforcement in the external prestressed steel strand 200, which would reduce the prestress that is conducive to reinforcement in the external prestressed steel strand 200.

[0052] Specifically, for the case where the anchor rod 5 is anchored to the box girder 100, the position of the main reinforcing bars of the box girder 100 should be determined by the flaw detection method before the anchor rod 5 is installed, and the anchor rod 5 should be staggered with the main reinforcing bars to avoid the anchor rod 5 damaging the structure of the box girder 100 and affecting the performance of the box girder 100.

[0053] Optionally, see Figure 3An external prestressed steel strand anchorage device for the box girder is installed at the end of the box girder 100. A transverse diaphragm 103 is provided at the end of the box girder 100. The external prestressed steel strand anchorage device for the box girder also includes a first pad 61, a second pad 62 and a plurality of tie members 63. The first pad 61 can be attached to the side of the transverse diaphragm 103 away from the second support steel plate 32. The second pad 62 can be attached to the side of the transverse diaphragm 103 facing the second support steel plate 32 and is fixedly connected to the second support steel plate 32. The tie members 63 pass through the first pad 61 and the transverse diaphragm 103 and are anchored to the second pad 62, or the tie members 63 pass through the second pad 62 and the transverse diaphragm 103 and are anchored to the first pad 61. This configuration allows the external prestressed steel strand anchorage device for box girders provided in this embodiment to be connected to the transverse diaphragm 103 of the box girder 100, enabling the installation of the external prestressed steel strand anchorage device at the end of the box girder 100. That is, the external prestressed steel strand anchorage device can be installed either at the mid-span of the box girder 100 or at the support 1 of the box girder 100, expanding the versatility of the external prestressed steel strand anchorage device for box girders. When the tie member 63 passes through the transverse diaphragm 103, localized high stress will occur at the contact surface between the tie member 63 and the transverse diaphragm 103. The provision of the first pad 61 and the second pad 62 can diffuse the aforementioned high stress, thereby reducing the local pressure on the transverse diaphragm 103 and preventing damage to the transverse diaphragm 103 due to localized stress concentration, thus ensuring the structural integrity of the box girder 100. In addition, the first pad 61 and the second pad 62 are respectively disposed on both sides of the transverse partition 103, which can prevent the transverse partition 103 from being damaged due to excessive force on one side.

[0054] For example, the tie member 63 is a tie bolt, the first pad 61 and the second pad 62 are both made of steel plates, and the second pad 62 is welded to the second support steel plate 32.

[0055] Optionally, see Figure 2 The support assembly 3 also includes a second connecting plate 331. A second connecting plate 331 is provided between any two adjacent first support steel plates 31. One end of the second connecting plate 331 is connected to one of the two adjacent first support steel plates 31, and the other end is connected to the other of the two adjacent first support steel plates 31. The second connecting plate 331 connects two adjacent first support steel plates 31, thereby increasing the overall rigidity of the multiple first support steel plates 31 to stably support the steel anchor 2.

[0056] For example, the second connecting plate 331 is made of steel plate and is welded to the first supporting steel plate 31.

[0057] In this embodiment, see Figure 2 and Figure 3There are two first support steel plates 31. The second connecting plate 331 is perpendicular to the first support steel plate 31 and extends along the extension direction of the first support steel plate 31. The second connecting plate 331 is located between the steel anchor 2 and the turning pipe 4.

[0058] Optionally, see Figure 2 and Figure 3 The support assembly 3 also includes a plurality of first stiffening plates 332 disposed on the first support steel plate 31. The plurality of first stiffening plates 332 are arranged at intervals in the vertical direction. The first stiffening plates 332 are perpendicular to the first support steel plate 31 and extend along the extension direction of the first support steel plate 31. The arrangement of the first stiffening plates 332 can increase the moment of inertia and torsional constant of the section of the first support steel plate 31, thereby reducing the deformation of the first support steel plate 31 under bending moment or torque, ensuring the support effect of the first support steel plate 31 on the steel anchor 2, and improving the overall structural stability of the external prestressed steel strand anchoring device used for box girders.

[0059] For example, the first stiffening plate 332 is made of steel plate and is welded to the first support steel plate 31.

[0060] In this embodiment, see Figure 2 and Figure 3 The support assembly 3 also includes multiple second stiffening plates 333, which are arranged at intervals along the vertical direction. The first stiffening plate 332 and the second stiffening plate 333 are respectively located on both sides of the first support steel plate 31, and the second stiffening plates 333 are parallel to the first stiffening plate 332. The arrangement of the second stiffening plates 333 can balance the forces on both sides of the first support steel plate 31, avoid excessive stiffness on one side of the first support steel plate 31, and prevent local instability of the first support steel plate 31 caused by excessive stiffness on one side, thereby further improving the overall structural stability of the external prestressed steel strand anchorage device for box girders.

[0061] For example, the second stiffening plate 333 is made of steel plate and is welded to the first support steel plate 31.

[0062] Optionally, see Figure 4 The support assembly 3 also includes a plurality of third stiffening plates 334 disposed on the first support steel plate 31. The plurality of third stiffening plates 334 are arranged at intervals along the extension direction of the first support steel plate 31, and the third stiffening plates 334 are perpendicular to the first support steel plate 31 and extend in the vertical direction. The arrangement of the third stiffening plates 334 can also increase the moment of inertia and torsional constant of the section of the first support steel plate 31, thereby reducing the deformation of the first support steel plate 31 under bending moment or torque, ensuring the support effect of the first support steel plate 31 on the steel anchor 2, and improving the overall structural stability of the external prestressed steel strand anchoring device used for box girders.

[0063] For example, the third stiffening plate 334 is made of steel plate and is welded to the first support steel plate 31.

[0064] See Figure 2 , Figure 3 and Figure 4 When the support 1 is installed on the bottom plate 101 of the box girder 100, two first support steel plates 31 are provided, and the steering pipe 4 is located between the two first support steel plates 31. The first stiffening plate 332 and the third stiffening plate 334 are both provided on the side of the first support steel plate 31 away from each other, and the second stiffening plate 333 is provided on the side of the first support steel plate 31 facing each other. Each side of the first support steel plate 31 is provided with two first stiffening plates 332, one second stiffening plate 333, and two third stiffening plates 334. The second stiffening plate 333 is on the same horizontal plane as the upper first stiffening plate 332, and the lower first stiffening plate 332 is on the same horizontal plane as the second connecting plate 331, ensuring the symmetry of the force on both sides of the first support steel plate 31. The lengths of the first stiffening plate 332 and the second stiffening plate 333 are both less than the length of the first supporting steel plate 31. The first stiffening plate 332 and the second stiffening plate 333 both extend from the steel anchor 2 to the steering pipe 4. The third stiffening plate 334 is provided on the part of the first supporting steel plate 31 where the first stiffening plate 332 is not provided, that is, the part of the first supporting steel plate 31 corresponding to the steering pipe 4.

[0065] Further, see Figure 2 The support component 3 also includes a fourth stiffening plate 335. A fourth stiffening plate 335 is provided between the support 1 and the lowest first stiffening plate 332, as well as between any two adjacent first stiffening plates 332, in order to increase the overall stiffness of the multiple first stiffening plates 332 and improve the overall stability.

[0066] See Figure 6 , Figure 7 and Figure 8 When the support 1 is installed on the top plate 102 of the box girder 100, there are two first support steel plates 31, and the turning pipe 4 is located between the two first support steel plates 31. The first stiffening plate 332 is located on the side of the first support steel plates 31 away from each other, and the second stiffening plate 333 is located on the side of the first support steel plates 31 facing each other. The first support steel plates 31 are provided with third stiffening plates 334 on both sides along their thickness. Each side of the first support steel plate 31 is provided with two first stiffening plates 332, one second stiffening plate 333, and four third stiffening plates 334. The second stiffening plate 333 is on the same horizontal plane as the first stiffening plate 332 located above it, and the first stiffening plate 332 located below it is on the same horizontal plane as the second connecting plate 331.

[0067] Specifically, when the support 1 is installed at different positions on the box girder 100, the arrangement of the second connecting plate 331, the first stiffening plate 332, the second stiffening plate 333, the third stiffening plate 334 and the fourth stiffening plate 335 are different and need to be calculated and determined according to the specific construction conditions.

[0068] Optionally, the steel anchor 2 includes a steel anchor plate and an anchoring disc disposed on the steel anchor plate. The steel anchor plate is fixedly connected to the support 1. An anchoring hole is provided on the anchoring disc. The external prestressed steel strand 200 can pass through the anchoring hole and be clamped by the hole wall of the anchoring hole to realize the anchoring of the external prestressed steel strand 200 on the steel anchor 2.

[0069] For example, the steel anchor plate is composed of two steel plates welded together. Preferably, multiple steel anchor plates are provided to increase the overall strength of the steel anchor 2.

[0070] Optionally, see Figure 2 and Figure 9 The support 1 is provided with multiple support seats 7, which are arranged at intervals along the extension direction of the steering pipe 4. The support seats 7 are provided with arc-shaped grooves 71, and the steering pipe 4 is locked in the arc-shaped grooves 71 to stably set the steering pipe 4 on the support 1.

[0071] Specifically, see Figure 3 There are two first support steel plates 31. The steering pipe 4 is located between the two first support steel plates 31. The bottom of the support 7 is connected to the second connecting plate 331 or directly connected to the first connecting plate 11 of the support 1. The two ends of the support 7 are respectively connected to the two first support steel plates 31, so that the support 7 can be stably installed on the support 1.

[0072] For example, the support 7 is made of steel plate and is welded to the first connecting plate 11 and the first supporting steel plate 31. The cross-sectional shape of the arc groove 71 is semi-circular to ensure that the steering tube 4 can be locked in the arc groove 71.

[0073] The installation process of the external prestressed steel strand anchorage device for box girder provided in this embodiment within box girder 100 is as follows:

[0074] First, determine the dimensions of the inner hole of the box girder 100 and the location of the main reinforcing bars of the box girder 100 at the installation position of the concrete seat 12. Then, pour the concrete seat 12 inside the box girder 100, and fabricate the first connecting plate 11, steel anchors 2, support components 3, and steering pipe 4 according to the dimensions of the inner hole of the box girder 100. After the concrete seat 12 reaches the required strength, place the first connecting seat on the concrete seat 12 and anchor the anchor rod 5 to the concrete seat 12. Finally, install the anchor rod 5, support components 3, and steering pipe 4 on the support 1.

[0075] The above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.

Claims

1. An external prestressed steel strand anchorage device for box girders, characterized in that, include: Support (1) can be installed on the bottom plate (101) or top plate (102) of the box girder (100); Steel anchor (2) is provided on the support (1), and the external prestressed steel strand (200) can be anchored to the steel anchor (2); A support assembly (3) is provided on the support (1). The support assembly (3) includes a plurality of first support steel plates (31) and a plurality of second support steel plates (32). The first support steel plates (31) and the second support steel plates (32) are respectively provided on both sides of the steel anchor (2) along its thickness direction. The plurality of first support steel plates (31) are symmetrically arranged along the extension direction of the steel anchor (2). The plurality of second support steel plates (32) correspond one-to-one with the plurality of first support steel plates (31), and the first support steel plates (31) and the second support steel plates (32) are both fixedly connected to the steel anchor (2). A steering tube (4) is provided on the support (1) and located at the end of the first support steel plate (31) away from the steel anchor (2). The steering tube (4) has a first through hole at the end away from the steel anchor (2) and a second through hole at the end facing the steel anchor (2). The height of the first through hole is different from the height of the second through hole. The external prestressed steel strand (200) can enter the inner cavity of the steering tube (4) through the first through hole and exit through the second through hole.

2. The external prestressed steel strand anchorage device for box girders according to claim 1, characterized in that, The external prestressed steel strand anchoring device for the box girder also includes a plurality of anchor rods (5), which are arranged in a matrix. The support (1) includes a first connecting plate (11), and the steel anchor (2) is disposed on the first connecting plate (11). The first connecting plate (11) can fit against the bottom plate (101) or top plate (102) of the box girder (100). The anchor rod (5) passes through the first connecting plate (11) and is anchored to the bottom plate (101) or top plate (102) of the box girder (100).

3. The external prestressed steel strand anchorage device for box girders according to claim 2, characterized in that, The support (1) further includes a concrete seat (12), which can be installed on the bottom plate (101) of the box girder (100). The first connecting plate (11) is embedded in the top of the concrete seat (12). The anchor rod (5) passes through the first connecting plate (11) and is anchored to the concrete seat (12), or the anchor rod (5) passes through the first connecting plate (11) and the concrete seat (12) and is anchored to the bottom plate (101) of the box girder (100).

4. The external prestressed steel strand anchorage device for box girders according to claim 1, characterized in that, The external prestressed steel strand anchorage device for the box girder is disposed at the end of the box girder (100). The end of the box girder (100) is provided with a transverse diaphragm (103). The external prestressed steel strand anchorage device for the box girder also includes a first pad (61), a second pad (62), and a plurality of tie members (63). The first pad (61) can be attached to the side of the transverse diaphragm (103) away from the second support steel plate (32). The second pad (62) can be attached to the side of the transverse diaphragm (103) facing the second support steel plate (32) and is fixedly connected to the second support steel plate (32). The tie members (63) pass through the first pad (61) and the transverse diaphragm (103) and are anchored to the second pad (62), or the tie members (63) pass through the second pad (62) and the transverse diaphragm (103) and are anchored to the first pad (61).

5. The external prestressed steel strand anchorage device for box girders according to claim 1, characterized in that, The support assembly (3) further includes a second connecting plate (331). A second connecting plate (331) is provided between any two adjacent first support steel plates (31). One end of the second connecting plate (331) is connected to one of the two adjacent first support steel plates (31), and the other end is connected to the other of the two adjacent first support steel plates (31).

6. The external prestressed steel strand anchorage device for box girders according to claim 1, characterized in that, The support assembly (3) further includes a plurality of first stiffening plates (332) disposed on the first support steel plate (31). The plurality of first stiffening plates (332) are arranged at intervals in the vertical direction. The first stiffening plates (332) are perpendicular to the first support steel plate (31) and extend along the extension direction of the first support steel plate (31).

7. The external prestressed steel strand anchorage device for box girders according to claim 6, characterized in that, The support assembly (3) also includes a plurality of second stiffening plates (333), which are arranged at intervals in the vertical direction. The first stiffening plate (332) and the second stiffening plates (333) are respectively located on both sides of the first support steel plate (31), and the second stiffening plates (333) are parallel to the first stiffening plate (332).

8. The external prestressed steel strand anchorage device for box girders according to claim 1, characterized in that, The support assembly (3) further includes a plurality of third stiffening plates (334) disposed on the first support steel plate (31). The plurality of third stiffening plates (334) are arranged at intervals along the extension direction of the first support steel plate (31). The third stiffening plates (334) are perpendicular to the first support steel plate (31) and extend in the vertical direction.

9. The external prestressed steel strand anchorage device for box girders according to any one of claims 1-8, characterized in that, The steel anchor (2) includes a steel anchor plate and an anchor plate disposed on the steel anchor plate. The steel anchor plate is fixedly connected to the support (1). An anchor hole is provided on the anchor plate. The external prestressed steel strand (200) can pass through the anchor hole and be clamped by the hole wall of the anchor hole.

10. The external prestressed steel strand anchorage device for box girders according to any one of claims 1-8, characterized in that, The support (1) is provided with a plurality of support seats (7), which are arranged at intervals along the extension direction of the steering tube (4). The support seats (7) are provided with arc-shaped grooves (71), and the steering tube (4) is fitted into the arc-shaped grooves (71).

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