Active reinforcement of tie-arch bridges with suspender anchorage structure

Abstract

This utility model relates to the field of arch bridge technology, specifically to a hanger anchoring structure for actively reinforced concrete tied arch bridges. It includes a tie rod and an arch rib. The tie rod has a lower anchor, and the arch rib has an upper anchor. Two hangers are positioned between the lower and upper anchors. The bottom end of each hanger has a lower connector for connecting to the lower anchor, and the top end of each hanger has an upper connector for connecting to the upper anchor. This hanger anchoring structure for actively reinforced concrete tied arch bridges, through a combined anchoring design of the threaded post and auxiliary connecting rod of the lower connector, and the main threaded rod and auxiliary threaded rod of the upper connector, distributes the hanger tension to multiple stress nodes, avoiding the failure risk of traditional single-point pin connections and significantly improving the load-bearing capacity and stability of the anchoring structure.

Description

Technical Field

[0001] This utility model relates to the field of arch bridge technology, specifically to the anchorage structure of a tie-arch bridge for active reinforcement of concrete. Background Technology

[0002] Actively reinforced tied-arch bridges are a type of bridge structure that combines arch and tied-arch technologies. Their main characteristic lies in integrating concrete tie rods and arch ribs to form a unified load-bearing system. This design not only effectively distributes the bridge load but also enhances its load-bearing capacity and stability. With increasing traffic volume and extended service life, traditional tied-arch bridges may face problems such as structural fatigue and cracking during actual operation. Therefore, active reinforcement technology has emerged, its core being to enhance the overall performance of the bridge and ensure its long-term safe operation by adding new supports and anchorage structures.

[0003] Patent CN203270457U discloses a suspension anchoring structure for actively reinforcing a concrete tied arch bridge. The structure includes concrete tie rods, concrete arch ribs, and several vertically connected concrete suspension rods. The two ends of the arch ribs are integrated with the tie rods. An upper anchoring structure is provided on the arch ribs between adjacent suspension rods, and a lower anchoring structure is provided on the tie rods. A prestressed flexible cable-stayed suspension rod connects the upper and lower anchoring structures. The beneficial effects are: 1) The flexible cable-stayed suspension rods provide compressive stress reserves for the concrete suspension rods, eliminating cracks and improving the distribution of internal forces in the arch ribs and tie rods, increasing structural stiffness, and enhancing the bridge's load-bearing capacity and durability. Additionally, the addition of multiple elastic support points increases the structural stiffness of the old bridge, improving the comfort of vehicles and pedestrians crossing the bridge; 2) This active reinforcement method is simple in structure, convenient to construct, economical in cost, and does not affect the overall aesthetics of the bridge; 3) The flexible cable-stayed suspension rod structure is simple and convenient to disassemble and replace.

[0004] Existing tie-arch bridge gantry anchorage structures, particularly those involving extending the upper end lug of the flexible cable-stayed gantry between two pin plates and anchoring it via pins during construction, present certain risks. The primary risk is single-point stress risk. Since the stress at the top of the flexible cable-stayed gantry mainly depends on the bearing capacity of the pins, fatigue, wear, breakage, or improper installation of the pins could lead to anchorage failure, affecting the overall safety of the bridge. In light of these risks, we propose an active reinforcement structure for the tie-arch bridge gantry anchorage. This approach aims to improve overall safety and stability by optimizing the anchorage scheme and incorporating multi-point stress design, thereby better meeting the needs of modern bridge engineering. Utility Model Content

[0005] The purpose of this invention is to provide a hanger anchorage structure for actively reinforcing a concrete tied arch bridge, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] The active reinforcement structure for tied-arch concrete bridges includes tie rods and arch ribs. The arch ribs, as the main arch structure, bear the vertical loads of the bridge, while the tie rods, as horizontal tension members, together with the arch ribs form a stable load-bearing system. Figure 1 and Figure 2 As shown, the tie rod is provided with a lower anchor, which is fixed to the tie rod and is used to connect the lower connector of the hanger. The arch rib is provided with an upper anchor, which is fixed to the arch rib and is used to connect the upper connector of the hanger. Two hangers are provided between the lower and upper anchors. The hangers transmit the bridge load through the upper and lower anchors. The bottom end of the hanger is provided with a lower connector for connecting to the lower anchor. The lower connector achieves multi-point anchoring through threaded rods and auxiliary connecting rods. The top end of the hanger is provided with an upper connector for connecting to the upper anchor. The upper connector disperses the tension through the main threaded rod and the auxiliary threaded rod to avoid single-point stress.

[0008] Preferred, such as Figure 5 As shown, the lower anchor has a "U" shaped structure. The bottom of both the left and right sides of the lower anchor has an integrally formed mounting base. The mounting base is connected to the tie rod by multiple bolts to ensure the overall stability of the anchor.

[0009] The lower anchor is provided with a first connecting groove at the top and the middle of the front and rear edges. The first connecting groove is used to pass through the threaded column to form the main force channel. The lower anchor is provided with a second connecting groove at the top and near the front and rear edges. The second connecting groove is used to pass through the auxiliary connecting rod to enhance the shear resistance.

[0010] The lower connector includes a first fixing plate integrally formed with the boom. The first fixing plate connects the boom and the anchoring assembly into a whole. A threaded post is welded to the middle of the bottom of the first fixing plate. The threaded post passes through the first connecting groove and is locked in place by a crimp nut. The threaded post passes through the first connecting groove. An anti-detachment plate is welded to the bottom end of the threaded post. The top of the anti-detachment plate abuts against the top of the inner wall of the lower anchor. The anti-detachment plate restricts the threaded post from detaching from the lower anchor and cooperates with the threaded post to bear the main tensile force.

[0011] The outer wall of the threaded column is threaded with a crimp nut. The bottom of the crimp nut abuts against the top of the lower anchor. The crimp nut presses the lower anchor and the anti-detachment plate together through the threads to ensure a firm anchor.

[0012] Two auxiliary connecting rods are provided between the first fixing plate and the anti-detachment plate, which are arranged symmetrically from left to right. The auxiliary connecting rods pass through the second connecting groove to share the lateral shear force and enhance the anchoring reliability.

[0013] Preferred, combined Figure 3 and Figure 4 As shown, the upper anchor has a "U" shaped structure and is connected to the arch rib by multiple bolts. Rectangular holes are provided on both the front and rear sides of the upper anchor near the bottom. A bearing plate is connected to both rectangular holes. The front end of the bearing plate protrudes from the front side of the upper anchor and the rear end of the bearing plate protrudes from the rear side of the upper anchor. The protruding parts expand the anchoring area and improve stability. The bearing plate is welded to the upper anchor. Two circular holes a are symmetrically arranged on the top of the bearing plate. Circular holes a are for the main threaded rod to pass through and serve as the main anchoring point. Four circular holes b are also provided on the top of the bearing plate. Circular holes b are for the auxiliary threaded rod to pass through and form auxiliary anchoring points to distribute the tensile force.

[0014] The foremost circular hole b is located in front of the upper anchor, the last circular hole b is located behind the upper anchor, and the two middle circular holes b are located inside the upper anchor to provide redundant anchoring and ensure safety. The front circular hole a is located between the two front circular holes b, and the rear circular hole a is located between the two rear circular holes b, which helps to distribute the tension between the main thread rod and the auxiliary thread rod.

[0015] The upper connector includes a second fixing plate integrally formed with the suspension rod. The top of the second fixing plate is provided with a main threaded rod. The main threaded rod passes through the round hole a and is threadedly connected to a first locking nut. The main threaded rod passes through the round hole a and is locked by the first locking nut, bearing the main tensile force.

[0016] The second fixing plate is provided with a secondary threaded rod at the top and near the front and rear ends. The secondary threaded rod passes through the corresponding circular hole b and is threadedly connected to a second locking nut. The secondary threaded rod passes through the circular hole b and is locked by the second locking nut to help share the tensile force and enhance the reliability of the auxiliary anchoring point.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. The hanger anchorage structure of this actively reinforced concrete tied arch bridge, through the combined anchorage design of the threaded post and auxiliary connecting rod of the lower connector, and the main threaded rod and auxiliary threaded rod of the upper connector, distributes the hanger tension to multiple stress nodes, avoids the failure risk of traditional single-point pin connection, and significantly improves the load-bearing capacity and stability of the anchorage structure.

[0019] 2. The anchorage structure of the tie-rod arch bridge with active reinforcement, the layout of the circular holes a and b on the bearing plate, and the tightening design of the anti-detachment plate and the crimping nut, provide multiple anchorage protections, effectively resist fatigue effects, and extend the service life of the anchorage structure. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the overall first-view structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the overall second-view structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the assembly structure of the arch rib and the upper anchor in this utility model.

[0023] Figure 4 This is a schematic diagram of the assembly structure of the upper connector and the upper anchor in this utility model;

[0024] Figure 5 This is a schematic diagram of the assembly structure of the lower connector and the lower anchor in this utility model;

[0025] In the diagram: 100, tie rod; 200, arch rib; 300, lower anchor; 310, first connecting groove; 320, second connecting groove; 330, mounting base; 400, upper anchor; 401, rectangular hole; 410, bearing plate; 411, round hole a; 412, round hole b; 500, lifting rod; 510, lower connector; 511, first fixing plate; 512, threaded post; 513, anti-detachment plate; 514, crimp nut; 515, auxiliary connecting rod; 520, upper connector; 521, second fixing plate; 522, main threaded rod; 523, auxiliary threaded rod; 524, first locking nut; 525, second locking nut. Detailed Implementation

[0026] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] Please see Figures 1-5 This utility model provides a technical solution:

[0029] The active reinforcement structure for the tie-arch bridge includes tie rods 100 and arch ribs 200. Arch ribs 200, as the main arch structure, bear the vertical load of the bridge, while tie rods 100, as the horizontal tension members of the bridge, together with arch ribs 200, form a stable load-bearing system. Figure 1 and Figure 2 As shown, the tie rod 100 is provided with a lower anchor 300, which is fixed to the tie rod 100 and is used to connect the lower connector 510 of the hanger 500. The arch rib 200 is provided with an upper anchor 400, which is fixed to the arch rib 200 and is used to connect the upper connector 520 of the hanger 500. Two hangers 500 are provided between the lower anchor 300 and the upper anchor 400. The hangers 500 transmit the bridge load through the upper and lower anchors. The bottom end of the hanger 500 is provided with a lower connector 510 for connecting with the lower anchor 300. The lower connector 510 achieves multi-point anchoring through the threaded post 512 and the auxiliary connecting rod 515. The top end of the hanger 500 is provided with an upper connector 520 for connecting with the upper anchor 400. The upper connector 520 disperses the tension through the main threaded rod 522 and the auxiliary threaded rod 523 to avoid single-point stress.

[0030] In this embodiment, as Figure 5 As shown, the lower anchor 300 has a "U" shaped structure. The bottom of both sides of the lower anchor 300 has an integrally formed mounting base 330. The mounting base 330 is connected to the tie rod 100 by multiple bolts to ensure the overall stability of the anchor.

[0031] The top of the lower anchor 300 and the middle of the front and rear edges are provided with a first connecting groove 310. The first connecting groove 310 is used to pass through the threaded post 512 to form the main force channel. The top of the lower anchor 300 and the position near the front and rear edges are provided with a second connecting groove 320. The second connecting groove 320 is used to pass through the auxiliary connecting rod 515 to enhance the shear resistance.

[0032] The lower connector 510 includes a first fixing plate 511 integrally formed with the boom 500. The first fixing plate 511 connects the boom 500 and the anchoring assembly into a whole. A threaded post 512 is welded to the middle of the bottom of the first fixing plate 511. The threaded post 512 passes through the first connecting groove 310 and is locked in place by a crimp nut 514. The threaded post 512 passes through the first connecting groove 310. An anti-detachment plate 513 is welded to the bottom end of the threaded post 512. The top of the anti-detachment plate 513 abuts against the top of the inner wall of the lower anchor 300. The anti-detachment plate 513 restricts the threaded post 512 from detaching from the lower anchor 300 and cooperates with the threaded post 512 to bear the main tensile force.

[0033] The outer wall of the threaded column 512 is threaded with a crimp nut 514. The bottom of the crimp nut 514 abuts against the top of the lower anchor 300. The crimp nut 514 presses the lower anchor 300 and the anti-detachment plate 513 through the thread to ensure a firm anchoring.

[0034] Two auxiliary connecting rods 515 are provided between the first fixing plate 511 and the anti-detachment plate 513, which are arranged symmetrically on the left and right. The auxiliary connecting rods 515 pass through the second connecting groove 320, and share the lateral shear force to enhance the anchoring reliability.

[0035] Specifically, in combination Figure 3 and Figure 4 As shown, the upper anchor 400 has a "U" shaped structure. The upper anchor 400 is connected to the arch rib 200 by multiple bolts. Rectangular holes 401 are provided on both the front and rear sides of the upper anchor 400 and near the bottom. A bearing plate 410 is connected to both rectangular holes 401. The front end of the bearing plate 410 protrudes from the front side of the upper anchor 400, and the rear end of the bearing plate 410 protrudes from the rear side of the upper anchor 400. The protruding part expands the anchoring area and improves stability. The bearing plate 410 is welded to the upper anchor 400. Two circular holes a411 are provided on the top of the bearing plate 410, which are arranged symmetrically front to back. The circular holes a411 allow the main threaded rod 522 to pass through and serve as the main anchoring point. Four circular holes b412 are also provided on the top of the bearing plate 410. The circular holes b412 allow the auxiliary threaded rod 523 to pass through and form auxiliary anchoring points to disperse the tensile force.

[0036] The foremost round hole b412 is located in front of the upper anchor 400, the last round hole b412 is located behind the upper anchor 400, and the two middle round holes b412 are located inside the upper anchor 400 to provide redundant anchoring and ensure safety. The front round hole a411 is located between the two front round holes b412, and the rear round hole a411 is located between the two rear round holes b412, which helps the main thread rod 522 and the auxiliary thread rod 523 to distribute the tension.

[0037] The upper connector 520 includes a second fixing plate 521 integrally formed with the lifting rod 500. The top of the second fixing plate 521 is provided with a main thread rod 522. The main thread rod 522 passes through the round hole a411 and is threadedly connected to a first locking nut 524. The main thread rod 522 passes through the round hole a411 and is locked by the first locking nut 524, bearing the main tensile force.

[0038] The second fixing plate 521 has a secondary threaded rod 523 at the top and near the front and rear ends. The secondary threaded rod 523 passes through the corresponding round hole b412 and is threadedly connected to the second locking nut 525. The secondary threaded rod 523 passes through the round hole b412 and is locked by the second locking nut 525 to help share the tension and enhance the reliability of the auxiliary anchor point.

[0039] In this embodiment, the active reinforcement of the concrete tied arch bridge's hanger anchoring structure is used as follows: First, the lower anchor 300 is fixed to the tie rod 100 via the mounting base 330 using multiple bolts, ensuring that the U-shaped structure of the lower anchor 300 stably fits the tie rod 100. Next, the upper anchor 400 is connected to the arch rib 200 via multiple bolts, and a bearing plate 410 is welded to its rectangular hole 401, expanding the anchoring area with the front and rear protruding portions of the bearing plate 410. Then, the threaded post 512 of the lower connector 510 at the bottom of the hanger 500 is passed through the first connecting groove 310 of the lower anchor 300, and the top of the lower anchor 300 is locked using a crimp nut 514. Simultaneously, the auxiliary connecting rod 51... 5. Passing through the second connecting groove 320 to share the lateral shear force; in the upper connecting piece 520 at the top of the hanger 500, the main threaded rod 522 passes through the round hole a411 of the bearing plate 410 and is locked by the first locking nut 524, and the auxiliary threaded rod 523 passes through the round hole b412 and is locked by the second locking nut 525, so that the main threaded rod 522 bears the main tensile force and the auxiliary threaded rod 523 assists in distributing the load; finally, by adjusting the clamping force of the first locking nut 524 and the second locking nut 525, the force of each anchoring point is ensured to be uniform, and the reliable connection between the hanger 500 and the lower anchor 300 and the upper anchor 400 is completed, realizing the stable transmission of bridge load and multi-point anchoring.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A hanger anchorage structure for actively reinforced concrete tied arch bridges, comprising tie rods (100) and arch ribs (200), characterized in that: The tie rod (100) is provided with a lower anchor (300), the arch rib (200) is provided with an upper anchor (400), and two hangers (500) are provided between the lower anchor (300) and the upper anchor (400). The bottom end of the hanger (500) is provided with a lower connector (510) for connecting with the lower anchor (300), and the top end of the hanger (500) is provided with an upper connector (520) for connecting with the upper anchor (400).

2. The actively reinforced concrete tied-arch bridge's suspender anchorage configuration according to claim 1, characterized in that: The lower anchor (300) has a "U" shaped structure. The bottom of both sides of the lower anchor (300) is integrally formed with mounting bases (330). The mounting bases (330) are connected to the tie rod (100) by multiple bolts.

3. The actively reinforced concrete tied-arch bridge suspender anchorage configuration according to claim 1, wherein: The lower anchor (300) has a first connecting groove (310) at the top and at the middle of the front and rear edges, and a second connecting groove (320) at the top and near the front and rear edges.

4. The hanger anchorage structure for actively reinforced tied-arch concrete bridges according to claim 3, characterized in that: The lower connector (510) includes a first fixing plate (511) integrally formed with the rod (500). A threaded post (512) is welded to the middle of the bottom of the first fixing plate (511). The threaded post (512) passes through the first connecting groove (310). An anti-detachment plate (513) is welded to the bottom end of the threaded post (512). The top of the anti-detachment plate (513) abuts against the top of the inner wall of the lower anchor (300).

5. The actively reinforced concrete tied-arch bridge suspender anchorage configuration according to claim 4, wherein: The outer wall of the threaded post (512) is threaded with a crimp nut (514), the bottom of which abuts against the top of the lower anchor (300).

6. The actively reinforced concrete tied-arch bridge suspender anchorage configuration according to claim 4, wherein: Two auxiliary connecting rods (515) are provided between the first fixing plate (511) and the anti-detachment plate (513) and are arranged symmetrically on the left and right sides. The auxiliary connecting rods (515) pass through the second connecting groove (320).

7. The actively reinforced concrete tied-arch bridge suspender anchorage configuration according to claim 1, wherein: The upper anchor (400) has a "U" shaped structure. The upper anchor (400) is connected to the arch rib (200) by multiple bolts. Rectangular holes (401) are provided on both the front and rear sides and near the bottom of the upper anchor (400). A bearing plate (410) is connected to both rectangular holes (401). The bearing plate (410) is welded to the upper anchor (400). Two circular holes a (411) are provided on the top of the bearing plate (410) in a symmetrical arrangement. Four circular holes b (412) are also provided on the top of the bearing plate (410).

8. The actively reinforced concrete tied-arch bridge suspender anchorage configuration according to claim 7, wherein: The upper connector (520) includes a second fixing plate (521) integrally formed with the rod (500). The top of the second fixing plate (521) is provided with a main thread rod (522), which passes through a round hole a (411) and is threadedly connected to a first locking nut (524).

9. The actively reinforced concrete tied-arch bridge suspender anchorage configuration according to claim 8, wherein: The second fixing plate (521) is provided with a secondary threaded rod (523) at the top and near the front and rear ends. The secondary threaded rod (523) passes through the corresponding round hole b (412) and is threadedly connected to a second locking nut (525).

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