Tensioning tool for negative-angle vertical rotation of bridge arch rib

Abstract

The utility model discloses a tensioning tool for negative-angle vertical rotation of a bridge arch rib. The tensioning tool comprises a tensioning jack; an inhaul cable; the tensioning end comprises tensioning end lug plates, a counter-force seat and a tensioning end lug plate connecting piece, the two tensioning end lug plates are arranged in parallel, a first lug hole is formed in one end of each tensioning end lug plate, the tensioning end lug plate connecting piece is connected between the inner walls of the sides, close to the first lug holes, of the two tensioning end lug plates, and the counter-force seat is fixedly connected between the other ends of the two tensioning end lug plates; the anchoring end comprises anchoring end lug plates, a fixing seat and an anchoring end lug plate connecting piece, the two anchoring end lug plates are arranged in parallel, a second lug hole is formed in one end of each anchoring end lug plate, the anchoring end lug plate connecting piece is connected between the inner walls of the sides, close to the second lug holes, of the two anchoring end lug plates, and the fixing seat is fixedly connected between the other ends of the two anchoring end lug plates. According to the utility model, the tensioning end convenient for installing and fixing the jack is provided, the rigidity and the strength of the tensioning end and the anchoring end are improved, and the safety of the rotation construction of the arch rib is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge construction technical field especially a kind of bridge arch rib negative angle vertical rotation uses tensioning tool. BACKGROUND

[0002] Steel pipe concrete arch bridge is mainly composed of two kinds of materials of steel pipe and concrete. Steel pipe as the main arch rib of arch bridge, bears the main pressure and tension, and concrete is filled in the steel pipe to form a close combination. In this way, the overall strength of arch bridge is increased, and its bending and tensile properties are improved. This structure makes steel pipe concrete arch bridge perform excellently in bearing capacity and stability, and is suitable for bridge construction of various spans and geological conditions. The steel pipe arch rib structure in arch bridge can be constructed by full-support method, non-support hoisting method, low-position assembling and integral lifting method, and swivel construction method. Among them, the swivel construction method is favored by bridge builders due to its advantages of no support or less support.

[0003] The swivel construction method divides the arch ring or the entire superstructure into two half spans (which can be different lengths), and then pre-assembles the half arches on both banks of the river using the terrain or simple supports, and then rotates the half arches to the bridge axis position or the design elevation to close the arch. The current steel pipe arch rib bridge swivel construction mostly adopts the horizontal assembly and vertical lifting method. When assembling, simple horizontal assembly supports are first erected at low positions along the extension direction of the arch rib. After the erection is completed, the tensioning jack or winch is fixed on the tower to control the cable to lift the arch rib segment. However, the current public scheme does not provide a tensioning tool that is easy to install, fix the tensioning jack, and ensure the safety of the fixation. In particular, the project adopts a negative angle vertical rotation swivel method for the bridge arch rib. The bottom end of the arch rib segment is temporarily fixed, then vertically assembled, and after assembly is completed, it is rotated from top to bottom to the bridge axis position or the design elevation to close the arch under the traction of the jack and the lowering cable. In this way, the jack will bear a large load, especially at the moment when the bottom end of the arch rib segment is released, the tower will bear a large instantaneous force. Therefore, high requirements are placed on the stiffness and strength of the tensioning tool. SUMMARY

[0004] The utility model discloses a kind of bridge arch rib negative angle vertical rotation tensioning tool, provide the tensioning end of easy installation and fixed jack, and improve the stiffness and strength of tensioning end and anchoring end, improve the safety of arch rib swivel construction.

[0005] To achieve the above object, the technical scheme of the utility model is as follows:

[0006] A kind of bridge arch rib negative angle vertical rotation tensioning tool, comprising:

[0007] tensioning jack;

[0008] a cable controlled by the tensioning jack;

[0009] a tensioning end including a tensioning end ear plate, a counterforce seat and a tensioning end ear plate connector, the tensioning end ear plate is provided with two parallel plates, one end of which is provided with a first ear hole, and the inner walls of the two tensioning end ear plates near the first ear hole are connected by the tensioning end ear plate connector, and the other end is fixedly connected with the counterforce seat, the counterforce seat is matched with a first cable hole for accommodating the cable, and the space between the tensioning end ear plate connector can match the tensioning jack;

[0010] an anchoring end including an anchoring end ear plate, a fixed seat and an anchoring end ear plate connector, the anchoring end ear plate is provided with two parallel plates, one end of which is provided with a second ear hole, and the inner walls of the two anchoring end ear plates near the second ear hole are connected by the anchoring end ear plate connector, and the other end is fixedly connected with the fixed seat, the fixed seat is matched with a second cable hole for accommodating the cable, and a clamp for fixing the cable is provided.

[0011] Preferably, the counterforce seat includes a counterforce seat plate, a counterforce seat connector plate and a counterforce seat reinforcing plate, the counterforce seat plate is vertically connected between the inner walls of the other end of the tensioning end ear plate near the end, and extends from the top surface to the bottom surface of the tensioning end ear plate, the counterforce seat connector plate is provided with two parallel plates, which are vertically connected between the top surface and the bottom surface of the other end of the tensioning end ear plate respectively, and extends from the counterforce seat plate to the end of the other end of the tensioning end ear plate, and the counterforce seat plate has counterforce seat reinforcing plates vertically and crossly connected at intervals on the side facing the anchoring end.

[0012] Preferably, the outer side of the tensioning end ear plate is provided with at least two tensioning end ear plate reinforcing plates at intervals along the length direction.

[0013] Preferably, the first ear hole is provided with a first ear hole reinforcing plate around the side, and the first ear hole reinforcing plate is provided with four plates connected with the outer walls and the inner walls of the two tensioning end ear plates respectively.

[0014] Preferably, the tensioning end ear plate connector includes at least two tensioning end ear plate connector plates provided at intervals, and the two tensioning end ear plate connector plates are parallel to each other and symmetric to the transverse center line of the tensioning end ear plate along the length direction of the tensioning end ear plate.

[0015] Preferably, the fixing seat comprises a fixing seat plate, a fixing seat connecting plate and a fixing seat reinforcing plate, the fixing seat plate is vertically connected between the inner walls of the other end of the anchoring end ear plate close to the end portion and extends from the top surface to the bottom surface of the anchoring end ear plate, the fixing seat connecting plate is provided in parallel with two plates, which are vertically connected between the top surface and the bottom surface of the other end of the anchoring end ear plate respectively and extends from the fixing seat plate to the end portion of the other end of the anchoring end ear plate, and the side of the fixing seat plate facing the tensioning end is provided with reinforcing plates of counterforce seats which are vertically and crossly connected at intervals.

[0016] Preferably, the outer side of the anchoring end ear plate is provided with at least two anchoring end ear plate reinforcing plates at intervals along the length direction.

[0017] Preferably, the second ear hole is provided with second ear hole reinforcing plates, and the second ear hole reinforcing plates are provided with four plates which are connected with the outer walls and the inner walls of the two anchoring end ear plates respectively.

[0018] Preferably, the anchoring end ear plate connecting piece comprises at least two anchoring end ear plate connecting plates which are provided at intervals and extend along the length direction of the anchoring end ear plate and are parallel to each other and are symmetrical to the transverse center line of the anchoring end ear plate.

[0019] Preferably, the utility model further comprises jack fixers which are fixedly connected to the side of the counterforce seat facing the tensioning jack, are provided at intervals, are connected with the counterforce seat at the lower part and are bent inward to clamp the base of the tensioning jack at the upper part.

[0020] The bridge arch rib negative angle vertical turning tensioning tool has the following advantages:

[0021] (1) The tensioning end ear plate, the counterforce seat and the tensioning end ear plate connecting piece are adopted to form a frame type tensioning end to fix the tensioning jack, welding or bolt connection is not needed, the installation, replacement and dismounting operation of the tensioning jack is facilitated, the part of the cable which passes out of the tensioning jack towards the first ear hole can naturally drop without being blocked, a take-up reel is not needed to take up the cable, and thus the continuous lowering of the cable suspension arch rib part can be conveniently realized.

[0022] (2) The first cable hole and the second cable hole through which the cable passes are arranged on the counterforce seat and the fixing seat respectively, the cable is prevented from being twisted together, and the safety of construction is improved.

[0023] (3) The counterforce seat and the fixing seat which are connected stably and have good strength and rigidity are further provided, and the safety of construction is further ensured. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1This is a structural schematic diagram of an embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of the main structure of the tensioning end.

[0026] Figure 3 yes Figure 2 A top-view structural diagram.

[0027] Figure 4 yes Figure 2 A schematic diagram of the right-side structure.

[0028] Figure 5 This is a schematic diagram of the main structure of the anchoring end.

[0029] Figure 6 yes Figure 5 A top-view structural diagram.

[0030] Figure 7 yes Figure 5 A schematic diagram of the right-side structure.

[0031] In the diagram, tensioning end 100, tensioning end ear plate 110, tensioning end ear plate reinforcing plate 120, first ear hole reinforcing plate 130, first ear hole 140, tensioning end ear plate connector 150, reaction seat 160, reaction seat plate 161, reaction seat reinforcing plate 162, reaction seat connecting plate 163, first cable hole 164, anchoring end 200, anchoring end ear plate 210, anchoring end ear plate reinforcing plate 220, second ear hole reinforcing plate 230, second ear hole 240, anchoring end ear plate connector 250, fixing seat 260, fixing seat plate 261, fixing seat reinforcing plate 262, fixing seat connecting plate 263, second cable hole 264, cable 300, tensioning jack 400. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0033] In the description of this utility model, it should be noted that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. They are only used to facilitate the description of this utility model and to simplify 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.

[0034] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] A tensioning fixture for negative angle vertical rotation of bridge arch ribs, such as... Figure 1 As shown, it includes a tension jack 400, a cable 300, a tensioning end 100, and an anchoring end 200. The tension jack 400, typically a through-type jack, is used to tension the cable 300. The cable 300 is controlled by the tension jack 400, with one end connected to the tension jack 400 and the other end connected to the anchoring end 200. The tensioning end 100, as... Figures 2-4As shown, it includes a tensioning end ear plate 110, a reaction seat 160, and a tensioning end ear plate connector 150. Two tensioning end ear plates 110 are arranged in parallel, with a first ear hole 140 at one end. The tensioning end ear plate connector 150 connects the inner walls of the two tensioning end ear plates 110 near the first ear hole 140, and the reaction seat 160 is fixedly connected to the other end. The reaction seat 160 is fitted with a first cable hole 164 to accommodate the cable 300. The space between the reaction seat 160 and the tensioning end ear plate connector 150 is large enough to accommodate a tensioning jack 400. The two tensioning end ear plates 110 can be connected to the anchoring device via pins, facilitating installation and disassembly, while simultaneously meeting the requirements of the arch rib. The angle adjustment of the tension jack 400 during release is required, and there is space between the two tension end ear plates 110 to facilitate the installation, replacement and disassembly of the tension jack 400. The part of the cable 300 that passes through the first ear hole 140 of the tension jack 400 can hang down naturally without obstruction, without the need for a take-up reel. This allows for continuous lowering of the cable 300 suspending the arch rib, making operation convenient. During tensioning, the reaction seat 160 provides reaction force to the tension jack 400 to prevent it from coming off the tension end. The reaction seat is also equipped with a first cable hole 164 to position the cable 300 and prevent it from getting tangled. The anchoring end 200 includes an anchoring end ear plate 210, a fixing seat 260, and an anchoring end ear plate connector 250. Two anchoring end ear plates 210 are arranged in parallel. One end of each ear plate has a second ear hole 240. The anchoring end ear plate connector 250 is connected between the inner walls of the two anchoring end ear plates 210 near the second ear hole 240. The fixing seat 260 is fixedly connected between the other ends. The fixing seat 260 is fitted with a second cable hole 264 for the cable 300 to pass through, and is equipped with a clamp for fixing the cable 300. The anchoring end also uses the spaced anchoring end ear plates 210 as the main frame, which allows the clamp to be easily installed in the space between the anchoring end ear plates 210, thereby quickly fixing the cable 300. The fixing seat is provided with a second cable hole 264 to position the cable 300, which can cooperate with the first cable hole 164 of the reaction seat 160 to prevent them from getting tangled together. It should also be noted that the length of the anchor end ear plate 210 is less than the length of the tension end ear plate 110. This is because the anchor end 200 needs to be equipped with a tension jack 400, so a larger space is required. On the other hand, the tension end 200 only needs to be equipped with a clamp for fixing the cable 300. The clamp is relatively small and only a smaller space is required.

[0036] Preferably, this embodiment provides a reaction seat 160 with stable connection and good strength and rigidity, combined with Figure 3 and Figure 4 As shown, for ease of illustration, the structure of the reaction seat 160 is... Figure 3The diagram shows a portion of the reaction seat 160 in perspective, with the dashed lines representing the perspective structure. The reaction seat 160 includes a reaction seat plate 161, a reaction seat connecting plate 163, and a reaction seat reinforcing plate 162. The reaction seat plate 161 is vertically connected to the inner wall of the other end of the tensioning end ear plate 110 near the end, and extends from the top surface to the bottom surface of the tensioning end ear plate 110 (the top surface and bottom surface are relative to each other). Figure 2 In terms of direction, two reaction seat connecting plates 163 are arranged in parallel, respectively perpendicularly connected between the top and bottom surfaces of the other end of the tensioning end ear plate 110, and extend from the reaction seat plate 161 to the end of the other end of the tensioning end ear plate 110. The side of the reaction seat plate 161 facing the anchoring end 200 has reaction seat reinforcing plates 162 that are perpendicularly and intersecting at intervals. At least two reaction seat reinforcing plates 162 are arranged horizontally and vertically, i.e., as shown... Figure 4 The structure shown consists of two horizontal and two vertical reaction seat reinforcing plates 162. The reaction seat reinforcing plates 162 can enhance the structural rigidity of the reaction seat plate 161, and together with the reaction seat connecting plate 163, they can enhance the stability of the connection between the reaction seat plate 161 and the tensioning end ear plate 110, preventing the reaction seat plate 161 from deforming or detaching from the connection with the tensioning end ear plate 110.

[0037] Preferably, at least two tension end ear plate reinforcing plates 120 are provided at intervals along the length of the outer side of the tension end ear plate 110. The tension end ear plate reinforcing plates 120 can disperse the stress of the tension end ear plate 110. The two ends of the tension end ear plate reinforcing plates 120 are preferably obliquely shaped, and the middle part is strip-shaped, with the two ends being low and the middle part being high, which can disperse the stress and reduce the risk of stress concentration.

[0038] Preferably, four reinforcing plates 130 are provided around the first ear hole 140, which are respectively connected to the outer and inner walls of the two tension end ear plates 110. This strengthens the first ear hole 140 and prevents damage at the connection point with the pin. Additionally, the end with the first ear hole 140 is made into an arc shape, following a common ear plate design, with a diameter smaller than the height of the square structure at the other end. Since this is a common ear plate shape, it will not be described in detail here.

[0039] Preferably, the tensioning end ear plate connector 150 includes at least two spaced tensioning end ear plate connectors. Both tensioning end ear plate connectors extend along the length of the tensioning end ear plate 110 and are parallel to each other, and are symmetrical with respect to the transverse center line of the tensioning end ear plate 110. This embodiment provides a tensioning end ear plate connector 150 with a simple structure, so that the tensioning end forms a cubic skeleton structure, the force is distributed more evenly and it is easy to install.

[0040] Preferably, this embodiment provides a stable and strong fixing seat 260. The fixing seat 260 includes a fixing seat plate 261, a fixing seat connecting plate 263, and a fixing seat reinforcing plate 262. The fixing seat plate 261 is vertically connected to the inner wall of the other end of the anchoring end ear plate 210 near the end, and extends from the top surface to the bottom surface of the anchoring end ear plate 210. Two fixing seat connecting plates 263 are arranged in parallel, respectively vertically connected between the top surface and the bottom surface of the other end of the anchoring end ear plate 210, and extend from the fixing seat plate 261 to the end of the other end of the anchoring end ear plate 210. The side of the fixing seat plate 261 facing the tensioning end 100 has reaction seat reinforcing plates 162 that are vertically and intersectingly connected at intervals. The structure of the fixing seat 260 is similar to that of the reaction seat 160, and will not be described in detail here.

[0041] Preferably, at least two anchor end ear plate reinforcing plates 220 are provided at intervals along the length direction on the outer side of the anchor end ear plate 210. Similarly, the anchor end ear plate reinforcing plates 220 can disperse the stress of the anchor end ear plate 210 and improve the stiffness and strength of the anchor end ear plate 210.

[0042] Preferably, a second ear hole reinforcing plate 230 is provided around the second ear hole 240, and four second ear hole reinforcing plates 230 are provided, which are respectively connected to the outer wall and inner wall of the two anchor end ear plates 210. This can strengthen the second ear hole 240 and prevent damage at the position where it is connected to the arch rib ear plate by the pin.

[0043] Preferably, the anchoring end ear plate connector 250 includes at least two spaced-apart anchoring end ear plate connectors. Both connectors extend along the length of the anchoring end ear plate 210 and are parallel to each other, symmetrical about the transverse centerline of the anchoring end ear plate 210. This embodiment provides a simple anchoring end ear plate connector 250, enabling the anchoring end to form a cubic skeleton structure, resulting in more uniform stress distribution and easier installation.

[0044] Preferably, to better fix the tensioning jack 400 to the tensioning end 100, this embodiment also includes a jack retainer. The jack retainer can have various structural forms; it is only necessary to secure the tensioning jack 400 to the side of the reaction seat 160 facing the tensioning jack 400. This embodiment provides a simple structural form, in which the jack retainer is fixedly connected to the side of the reaction seat 160 facing the tensioning jack 400, with at least two spaced apart. The lower part is connected to the reaction seat 160, and the upper part is bent inward to secure the base of the tensioning jack 400. The jack retainer can have various shapes; the simplest can be a right-angled steel plate, with one side of the steel plate slightly higher than the height of the base of the tensioning jack 400. One end is welded to the reaction seat 160, and the other end is connected to the other side, which is secured to the base of the tensioning jack 400. This design better prevents the tension jack 400 from detaching from the tensioning end 100 during the installation of the tensioning fixture in this embodiment. This embodiment eliminates the need for welding or bolting to secure the tension jack 400, thus avoiding damage to the equipment. The tension jack 400 can be reused repeatedly.

[0045] When the tensioning fixture of this embodiment is applied to the negative angle vertical rotation of the bridge arch rib, the tensioning jack 400 and the cable 300 are first installed at the tensioning end 100. The other end of the cable 300 is also fixed by passing through the anchoring end 200. Then, the tensioning end ear plate 110 is connected to the ear plate of the anchoring device (such as a tower) through a pin. The anchoring end ear plate 210 is connected to the ear plate of the arch rib through a pin. The tensioning jack 400 can then tension the cable 300, so that the arch rib is continuously lowered from top to bottom under the control of the cable 300, thus realizing the negative angle rotation construction of the arch rib. The tensioning fixture of this utility model facilitates the installation, replacement, and disassembly of the tensioning jack. The part of the cable passing through the first ear hole of the tensioning jack can hang down naturally without obstruction, eliminating the need for a take-up reel. This allows for convenient and continuous lowering of the cable-suspended arch rib section, making operation easy. In addition, the use of a stable reaction seat and a fixed seat with good strength and rigidity ensures the strength and rigidity of the tensioning fixture, thus meeting the tensioning requirements for negative angle vertical rotation of the bridge arch rib.

Claims

1. A tensioning fixture for vertical rotation of bridge arch ribs at a negative angle, characterized in that... include: Tensioning the jack; The cable, which is controlled by the tension jack; The tensioning end includes a tensioning end ear plate, a reaction seat, and a tensioning end ear plate connector. Two tensioning end ear plates are arranged in parallel. One end of each ear plate has a first ear hole. The tensioning end ear plate connector is connected between the inner walls of the two tensioning end ear plates near the first ear hole. The other end of each ear plate is fixedly connected to a reaction seat. The reaction seat is fitted with a first cable hole to accommodate the cable. The space between the reaction seat and the tensioning end ear plate connector is large enough to accommodate the tensioning jack. The anchoring end includes an anchoring end lug, a fixing seat, and an anchoring end lug connector. Two anchoring end lugs are arranged in parallel. One end of each lug has a second lug hole. The anchoring end lug connector is connected between the inner walls of the two anchoring end lugs near the second lug hole. The fixing seat is fixedly connected between the other ends. The fixing seat is fitted with a second cable hole to accommodate the cable, and is equipped with a clamp for fixing the cable.

2. The tensioning fixture for negative angle vertical rotation of bridge arch ribs according to claim 1, characterized in that: The reaction seat includes a reaction seat plate, a reaction seat connecting plate, and a reaction seat reinforcing plate. The reaction seat plate is vertically connected between the inner walls of the other end of the tensioning end ear plate near the end, and extends from the top surface to the bottom surface of the tensioning end ear plate. Two reaction seat connecting plates are arranged in parallel, respectively vertically connected between the top surface and the bottom surface of the other end of the tensioning end ear plate, and extend from the reaction seat plate to the end of the other end of the tensioning end ear plate. The side of the reaction seat plate facing the anchoring end has reaction seat reinforcing plates that are vertically and intersectingly connected at intervals.

3. The tensioning fixture for vertical rotation of bridge arch ribs at negative angles according to claim 1, characterized in that: At least two tensioning end ear plate reinforcing plates are provided at intervals along the length direction on the outer side of the tensioning end ear plate.

4. The tensioning fixture for negative angle vertical rotation of bridge arch ribs according to claim 1, characterized in that: A first ear hole reinforcing plate is provided around the first ear hole. There are four first ear hole reinforcing plates, which are respectively connected to the outer wall and inner wall of the two tension end ear plates.

5. The tensioning fixture for negative angle vertical rotation of bridge arch ribs according to any one of claims 1-4, characterized in that: The tensioning end ear plate connector includes at least two tensioning end ear plate connecting plates spaced apart. Both tensioning end ear plate connecting plates extend along the length direction of the tensioning end ear plate and are parallel to each other, and are symmetrical with respect to the transverse center line of the tensioning end ear plate.

6. The tensioning fixture for negative angle vertical rotation of bridge arch ribs according to claim 1, characterized in that: The fixing seat includes a fixing seat plate, a fixing seat connecting plate, and a fixing seat reinforcing plate. The fixing seat plate is vertically connected between the inner walls of the other end of the anchoring end ear plate near the end, and extends from the top surface to the bottom surface of the anchoring end ear plate. Two fixing seat connecting plates are arranged in parallel, respectively vertically connected between the top surface and the bottom surface of the other end of the anchoring end ear plate, and extend from the fixing seat plate to the end of the other end of the anchoring end ear plate. The side of the fixing seat plate facing the tensioning end has reaction seat reinforcing plates that are vertically and intersectingly connected at intervals.

7. The tensioning fixture for negative angle vertical rotation of bridge arch ribs according to claim 1, characterized in that: At least two anchor end ear plate reinforcing plates are provided at intervals along the length direction on the outer side of the anchor end ear plate.

8. The tensioning fixture for negative angle vertical rotation of bridge arch ribs according to claim 1, characterized in that: The second ear hole is provided with a second ear hole reinforcing plate around its periphery. There are four second ear hole reinforcing plates, which are respectively connected to the outer wall and inner wall of the two anchor end ear plates.

9. The tensioning fixture for vertical rotation of bridge arch ribs at negative angles according to any one of claims 1, 6-8, characterized in that: The anchoring end lug connector includes at least two spaced-apart anchoring end lug connecting plates. Both anchoring end lug connecting plates extend along the length of the anchoring end lug and are parallel to each other, and are symmetrical with respect to the transverse centerline of the anchoring end lug.

10. The tensioning fixture for negative angle vertical rotation of bridge arch ribs according to claim 1, characterized in that: It also includes jack holders, which are fixedly connected to the side of the reaction seat facing the tension jack. At least two jack holders are provided at intervals, with the lower part connected to the reaction seat and the upper part bent inward to lock the base of the tension jack.

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