A widened solid masonry arch bridge deck structure, design method and construction method

Abstract

The application discloses a widened solid-web masonry arch bridge deck structure, a design method and a construction method, and belongs to the technical field of bridges.The structure comprises a support part, which is used for removing the bridge deck pavement and the side wall and filling material after a certain height is removed; and a width adjusting plate, which is arranged on the support part and has a width greater than that of the original solid-web masonry arch bridge deck, wherein a plurality of through holes are arranged on the width adjusting plate, the side wall of the support part and the main arch ring in correspondence; a plurality of prestressed tendons are arranged in correspondence with the plurality of holes, the prestressed tendons are inserted into the corresponding holes and are tensioned; the two ends of the prestressed tendons are anchored to the top of the width adjusting plate and the bottom of the main arch ring through anchorage devices; and a ribbed beam deck slab is fixedly connected to the upper end of the width adjusting plate.The application can help the bridge to adapt to the use requirements of modern traffic, effectively increase the width of the bridge without damaging the original bridge structure and appearance, and meanwhile, the historical and cultural values of the bridge are maintained.

Description

Technical Field

[0001] This invention belongs to the field of bridge technology, and particularly relates to a widened solid-web masonry arch bridge deck structure, design method, and construction method. Background Technology

[0002] Solid-web masonry arch bridges are a type of arch bridge constructed using traditional materials such as brick or stone. Their main characteristic is the use of a main arch ring as the primary load-bearing component, with the superstructure consisting of side walls, infill material, and bridge deck paving. This type of bridge fully utilizes the high compressive strength and durability of masonry materials (brick or stone), resulting in a stable main structure capable of withstanding significant loads. Solid-web masonry arch bridges have been widely used historically, particularly in the mountainous regions of the west where abundant bridge-building materials were available. These bridges often possess unique aesthetic features, such as elegant arches and the natural texture of local materials, harmoniously blending with their surroundings and becoming cultural and historical landmarks of their respective regions. Due to the use of traditional building materials and techniques, these bridges require specialized craftsmanship and techniques for maintenance and repair. Proper maintenance can significantly extend the bridge's lifespan, but improper repairs can damage its historical value and structural safety.

[0003] With rapid urbanization and an increase in the number of vehicles, existing bridge widths can no longer meet the growing traffic flow demands. Traffic congestion has become an increasingly serious problem, especially in urban and suburban areas. Widening bridges can improve traffic efficiency, reduce congestion, and thus enhance the flow of the entire transportation network.

[0004] Maintaining the structural load-bearing capacity and stability is a major challenge when widening masonry arch bridges. Any widening design and construction must ensure that the main structure of the bridge is not compromised, while also considering the potential impact of additional loads on the bridge's load-bearing capacity and overall stability. Many solid-web masonry arch bridges possess significant historical and cultural value; therefore, widening these bridges requires careful consideration of how to protect their historical features and aesthetic value—any alterations should minimize the impact on the bridge's original appearance. Furthermore, widening bridges may have environmental impacts, such as noise, air pollution, and disturbance to the surrounding ecosystem. Therefore, minimizing negative environmental impacts must be considered during the design and construction process.

[0005] Many existing methods of widening bridges, such as adding new structures to the sides of existing bridges, or making extensive modifications to the original structure, or even demolishing and rebuilding them, may not only affect the integrity and stability of the bridge structure, but these modifications may also damage the original appearance of the bridge and cause irreparable damage to historical heritage. Summary of the Invention

[0006] To solve the above problems, the present invention adopts the following technical solution: A widened solid-web masonry arch bridge deck structure, comprising: The supporting part is the remaining part after the original bridge deck pavement and the original side walls and original filling materials have been removed to a certain height; A width adjustment plate is provided on the support part. The width of the width adjustment plate is greater than the width of the original solid web masonry arch bridge deck. The width adjustment plate, the side wall retained in the support part, and the main arch ring are provided with multiple through holes. Multiple prestressing tendons are provided, and the multiple prestressing tendons are correspondingly arranged with multiple ducts. The prestressing tendons are inserted into the corresponding ducts and tensioned. The two ends of the prestressing tendons are respectively anchored to the top of the width adjustment plate and the bottom of the main arch ring by anchors. Ribbed bridge deck, which is fixedly connected to the upper end of the width adjustment plate.

[0007] Furthermore, the initial tension of the prestressed tendon is 0.2-0.3 times the ultimate tension.

[0008] Furthermore, after the prestressing tendons are tensioned, micro-expansion mortar is injected into the duct under high pressure to fill the duct tightly.

[0009] Furthermore, the width adjustment plate is a prefabricated component, and it is prefabricated in segments; each segment of the width adjustment plate is anchored by at least four prestressed tendons.

[0010] Furthermore, the ribbed bridge deck includes ribs and a bridge deck, wherein there are multiple ribs, which are evenly distributed at the lower end of the bridge deck.

[0011] A design method for a widened solid-web masonry arch bridge deck structure, as described in any of the above-mentioned design methods for a widened solid-web masonry arch bridge deck structure, wherein the design method calculates based on a width adjustment plate segment, and considers the most unfavorable load arrangement for the overturning stability of the width adjustment plate, and loads are... F Arranged on the outermost side of the slab, under load F Under its action, the width adjustment plate will rotate A The structure shows a tendency to overturn; however, due to the tensile force of the prestressed tendons, it possesses the ability to resist overturning; therefore, around... A The moment balance equation established at the point is as shown in equation (1). Due to the distance of the prestressing tendon on the left side... A The points are relatively close, so the anti-overturning moment they provide can be ignored; (1) In the formula, F External load; N PT-R The tensile force provided to the prestressing tendons;L 1 represents the distance from the external load to the rotation point. A Length; L 2 The distance between the right prestressed tendon and the rotation point A Length; n The number of prestressed tendons on one side for adding a width adjustment plate to a segment; According to formula (1), we can obtain N PT-R Subsequently, according to the "Code for Design of Concrete Structures" GB 50010-2010, the cross-sectional area of ​​the prestressing tendons is obtained according to formula (2). A s ; (2) In the formula, f ptk This is the standard value of the ultimate strength of the prestressing tendon, which is determined according to the type of prestressing tendon; Thickness of the width adjustment plate h 1. The reinforcement can be calculated based on the simply supported slabs placed on both sides of the side wall; among them, the segment division of the width adjustment slab needs to fully consider the hoisting capacity of the on-site construction and be determined according to the actual situation; Demolition height H 2. It relates to whether the self-weight of the newly added structural components exceeds the original structure, that is, whether it meets the requirements of formula (3); if it does not exceed, the main arch ring does not need to be reinforced; otherwise, the main arch ring needs to be reinforced by increasing the cross section or by using the hoop method. (3) In the formula, γ 1 represents the unit weight of reinforced concrete; γ 2 The combined density of the infill material and sidewalls; h 1 The thickness of the width adjustment plate is determined by calculation based on a simply supported plate. h 2 is the equivalent thickness of the rib beam and bridge deck, determined according to formula (4); H 2 represents the demolition height; (4) In the formula, h b The thickness of the bridge deck; m The number of ribs; h L The height of the rib beam; α It is the ratio of the width to the height of the rib beam, usually taken as 1 / 4 to 1 / 3; B 1 represents the widened bridge deck width; the demolition height... H 2. Perform the calculation.

[0012] Furthermore, the main arch and side walls are made of brick or stone; the width adjustment plate is made of reinforced concrete or prestressed concrete; the rib-beam bridge deck is made of reinforced concrete or steel; and the prestressing tendons are made of high-strength steel bars or steel strands.

[0013] A construction method for a widened solid-web masonry arch bridge deck structure, as described in any of the above-mentioned methods, includes the following steps: S 10. Demolish part of the arch structure, including side walls and infill materials of a certain height; S 20. Prefabricated width-adjustable panels at the factory or construction site; S 30. Transport the width adjustment plate to the site and install it in sections on the reserved side walls and infill material; S 40. Use a drilling machine to drill holes in the middle of the side wall, at the corresponding positions of the main arch ring and the width adjustment plate to form channels; S 50. Insert the prestressed tendons into the ducts, tension, anchor, and grout; S 60. Install or pour ribbed bridge deck panels; The installation of the width adjustment plate and the construction of the corresponding prestressing tendons must be carried out in sections, and the construction of the rib beam bridge deck can only be carried out after the prestressing tendons are tensioned.

[0014] Beneficial effects: This invention helps bridges adapt to the needs of modern transportation, effectively increasing their width without damaging their original structure and appearance, while preserving their historical and cultural value.

[0015] In addition, innovative technologies may reduce the overall cost of widening bridge projects by reducing resource consumption through more efficient design and construction methods. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structural form of an existing solid-web masonry arch bridge; Figure 2 for Figure 1 Sectional view 1-1; Figure 3 for Figure 2 Sectional view 2-2; Figure 4 This is a schematic diagram of the widened solid-web masonry arch bridge deck structure of the present invention; Figure 5 This is a plan view of the widened solid-web masonry arch bridge deck structure of the present invention; Figure 6 A schematic diagram of the demolition of an existing solid-web masonry arch bridge; Figure 7 This is a simplified calculation diagram of the widened solid-web masonry arch bridge deck structure of the present invention; Among them, 11. Main arch ring; 12. Superstructure; 121. Side wall; 122. Infill material; 123. Bridge deck pavement; 13. Abutment; 14. Foundation; 15. Conical slope; 16. Width adjustment plate; 17. Duct; 18. Prestressed tendon; 181. Anchorage; 182. Micro-expansion mortar; 19. Ribbed bridge deck; 191. Ribbed beam; 192. Bridge deck. Detailed Implementation

[0017] The structural forms of solid-web masonry arch bridges in the prior art, such as... Figure 1 , Figure 2 and Figure 3 As shown, a main arch ring 11 is used as the main load-bearing component, and an arch superstructure 12 is set on top of the main arch ring 11. The arch superstructure consists of side walls 121, infill material 122, and bridge deck pavement 123. The two ends of the main arch ring 11 are placed on abutments 13, which also serve to support the backfill soil behind the abutments. A foundation 14 is set at the bottom of the abutment 13, and a tapered slope 15 can be placed on the backfill soil behind the abutment 13.

[0018] Example 1

[0019] refer to Figure 4 - Figure 6 A widened solid-web masonry arch bridge deck structure, comprising: The support section is the remaining part after the removal of the bridge deck pavement 123, the removal of the side walls 121 of a certain height, and the filling material 122; Width adjustment plate 16 is installed on the support. The width of the width adjustment plate 16 is greater than the width of the original solid masonry arch bridge deck. Multiple through holes 17 are provided on the width adjustment plate 16, the side wall 121 retained in the support, and the main arch ring 11. Multiple prestressing tendons 18 are provided, and multiple prestressing tendons 18 are correspondingly arranged with multiple ducts 17. The prestressing tendons 18 are inserted into the corresponding ducts 17 and tensioned. The two ends of the prestressing tendons 18 are respectively anchored to the top of the width adjustment plate 16 and the bottom of the main arch ring 11 through anchors 181. Ribbed bridge deck 19 is fixedly connected to the upper end of width adjustment plate 16.

[0020] In this embodiment, the prestressing tendon 18 is either a high-strength steel bar or a steel strand.

[0021] In this embodiment, the initial tension of the prestressing tendon 18 is 0.2-0.3 times the ultimate tension.

[0022] After the prestressed tendons 18 are tensioned, micro-expansion mortar 182 is injected into the duct 17 under high pressure to fill the duct 17 tightly.

[0023] In this embodiment, the width adjustment plate 16 is a prefabricated component and is prefabricated in segments; each segment of the width adjustment plate 16 is provided with at least four prestressed tendons 18 for anchoring.

[0024] In this embodiment, the ribbed bridge deck 19 includes ribs 191 and a bridge deck 192. Multiple ribs 191 are evenly distributed at the lower end of the bridge deck 192. This ribbed bridge deck 19 has a relatively low self-weight, effectively reducing the load on the bridge structure, thus ensuring the bearing capacity of the main arch ring 11 meets requirements. Furthermore, the space created by the ribbed bridge deck 19 facilitates the arrangement of prestressing tendons 18 and allows for the installation of bridge-crossing equipment pipelines.

[0025] Specifically, in this embodiment, the main arch ring 11 is still used as the main load-bearing component. Because the bridge deck needs to be widened, the bridge deck pavement 123 needs to be removed, as well as a portion of the side walls 121 and the infill material 122, such as... Figure 6 As shown.

[0026] A width adjustment plate 16 is installed on the original structure. The width adjustment plate 16 is prefabricated in sections and suspended on the side wall 121 and the filling material 122. A hole 17 is drilled at the corresponding position in the middle of the side wall 121 using a drilling machine. The hole 17 passes through the newly added width adjustment plate 16, the side wall 121 and the main arch ring 11.

[0027] Next, the prestressing tendons 18 are inserted into the duct 17 and tensioned. The two ends of the prestressing tendons 18 are anchored to the top of the added width adjustment plate 16 and the bottom of the main arch ring 11, respectively, using anchors 181. Each newly added width adjustment plate 16 in each segment must be anchored with at least four prestressing tendons 18 (see [reference]). Figure 5 After the prestressing tendons 18 are tensioned, micro-expansion mortar 182 is injected under high pressure into the ducts 17 to fill them densely. The initial tension of the prestressing tendons is controlled at 0.2-0.3 times the ultimate tension. This tension ensures good structural integrity and self-correcting ability after eccentric loading.

[0028] Example 2

[0029] A design method for a widened solid-web masonry arch bridge deck structure is provided in Example 1. The main problem to be solved is the anti-overturning stability of the newly added width adjustment plate under eccentric loading. The key to solving this problem is the arrangement of prestressed steel bars and the determination of their cross-sectional area.

[0030] In this embodiment, a width-adjustable slab segment is used as an example for design calculation. Considering the most unfavorable load arrangement for the overturning stability of the width-adjustable slab, load F is placed on the outermost side of the slab. Under the action of load F, the width-adjustable slab will tend to overturn around point A. Due to the tension of the prestressing tendons, the structure possesses the ability to resist overturning (see...). Figure 7 Therefore, the moment balance equation established around point A is as shown in equation (1). Since the prestressing tendon on the left is closer to point A, the anti-overturning moment it provides is ignored. (1) In the formula, F External load; N PT-R The tensile force provided to the prestressing tendons; L 1 External load distance from the rotation point A Length; L 2 represents the distance between the right-side prestressed tendon and the rotation point. A Length; n The number of prestressed tendons on one side of the newly added width adjustment plate for a segment; in this embodiment, it is 2 tendons on one side. n =2; According to formula (1), we can obtain N PT-R Subsequently, according to the "Code for Design of Concrete Structures" GB 50010-2010, the cross-sectional area of ​​the prestressing tendons is obtained according to formula (2). A s ; (2) In the formula, f ptk This is the standard value of the ultimate strength of the prestressing tendon, which is determined according to the type of prestressing tendon. Thickness of the width adjustment plate h 1 The reinforcement can be calculated based on the simply supported slabs placed on both sides of the side wall; among them, the segment division of the width adjustment slab needs to fully consider the hoisting capacity of the on-site construction and be determined according to the actual situation; Demolition height H2. It relates to whether the self-weight of the newly added structural components exceeds the original structure, that is, whether it meets the requirements of formula (3); if it does not exceed, the main arch ring does not need to be reinforced; otherwise, the main arch ring needs to be reinforced by methods such as increasing the cross section or using the hoop method. (3) In the formula, γ 1 represents the unit weight of reinforced concrete, which can be taken as 25. kN / m 3 ; γ 2 For the combined density of the infill material and sidewalls, 20 can be taken. kN / m 3 ; h 1 represents the thickness of the width adjustment plate, calculated and determined based on a simply supported plate; h 2 is the equivalent thickness of the rib beam and bridge deck, determined according to formula (4); H 2 represents the demolition height; (4) In the formula, h b The thickness of the bridge deck; m The number of ribs; h L The height of the rib beam; α This is the ratio of the rib width to the height, usually taken as 1 / 4 to 1 / 3; B 1 This refers to the widened bridge deck width; The demolition height can be determined using the method described above. H 2. Perform the calculation.

[0031] In this embodiment, the main arch and side walls are made of brick or stone; the width adjustment plate is made of reinforced concrete or prestressed concrete; the rib-beam bridge deck is made of reinforced concrete or steel; and the prestressing tendons are made of high-strength steel bars or steel strands.

[0032] Example 3

[0033] A construction method for a widened solid-web masonry arch bridge deck structure, as provided in Example 1, includes the following steps: S 10. Demolish part of the superstructure, including side walls and infill material of a certain height (see...). Figure 6 ); S 20. Prefabricated width-adjustable panels at the factory or construction site; S 30. Transport the width adjustment plate to the site and install it in sections on the reserved sidewalls and infill material; S40. Use a drilling machine to drill holes in the middle of the side wall, at the corresponding positions of the main arch ring and the width adjustment plate to form channels; S50. Insert the prestressed tendons into the ducts, tension, anchor, and grout. S 60. Install or pour ribbed bridge deck panels; The installation of the width adjustment plate and the construction of the corresponding prestressing tendons must be carried out in sections, and the construction of the rib beam bridge deck can only be carried out after the prestressing tendons are tensioned.

[0034] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A widened solid-web masonry arch bridge deck structure, wherein, A solid-web masonry arch bridge uses a main arch ring as the primary load-bearing component. A superstructure is constructed atop the main arch ring, consisting of side walls, infill material, and bridge deck paving. Both ends of the main arch ring are placed on abutments, which also serve to support the backfill. A foundation is located at the bottom of each abutment, and the backfill behind the abutment can be sloped. The bridge deck structure of the widened solid-web masonry arch bridge includes: The supporting part is the remaining part after the bridge deck pavement and a certain height of side walls and filling materials have been removed; A width adjustment plate is provided on the support part. The width of the width adjustment plate is greater than the width of the original solid web masonry arch bridge deck. The width adjustment plate, the side wall of the support part, and the main arch ring are provided with multiple through holes. Multiple prestressing tendons are provided, and the multiple prestressing tendons are correspondingly arranged with multiple ducts. The prestressing tendons are inserted into the corresponding ducts and tensioned. The two ends of the prestressing tendons are respectively anchored to the top of the width adjustment plate and the bottom of the main arch ring by anchors. Ribbed bridge deck, which is fixedly connected to the upper end of the width adjustment plate.

2. The widened solid-web masonry arch bridge deck structure according to claim 1, characterized in that, The initial tension of the prestressed tendon is 0.2-0.3 times the ultimate tension.

3. The widened solid-web masonry arch bridge deck structure according to claim 2, characterized in that, After the prestressed tendons are tensioned, micro-expansion mortar is injected into the duct under high pressure to fill the duct tightly.

4. The widened solid-web masonry arch bridge deck structure according to claim 1, characterized in that, The width adjustment plate is a prefabricated component, and it is prefabricated in segments; each segment of the width adjustment plate is anchored by at least four prestressed tendons.

5. The widened solid-web masonry arch bridge deck structure according to claim 1, characterized in that, The ribbed bridge deck includes ribs and a bridge deck. There are multiple ribs, which are evenly distributed at the lower end of the bridge deck.

6. A design method for a widened solid-web masonry arch bridge deck structure, characterized in that, The design method for the widened solid-web masonry arch bridge deck structure according to any one of claims 1 to 5, wherein the design method is based on the calculation of a width adjustment plate segment, and considering the most unfavorable load arrangement for the overturning stability of the width adjustment plate, the load is... F Arranged on the outermost side of the slab, under load F Under its action, the width adjustment plate will rotate A The structure shows a tendency to overturn; however, due to the tensile force of the prestressed tendons, it possesses the ability to resist overturning; therefore, around... A The moment balance equation established at the point is as shown in equation (1). Due to the distance of the prestressing tendon on the left side... A The points are relatively close, so the anti-overturning moment they provide can be ignored; (1) In the formula, F External load; N PT-R The tensile force provided to the prestressing tendons; L 1 represents the distance from the external load to the rotation point. A Length; L 2 The distance between the right prestressed tendon and the rotation point A Length; n The number of prestressed tendons on one side for adding a width adjustment plate to a segment; According to formula (1), we can obtain N PT-R Subsequently, according to the "Code for Design of Concrete Structures" GB 50010-2010, the cross-sectional area of ​​the prestressing tendons is obtained according to formula (2). A s ; (2) In the formula, f ptk This is the standard value of the ultimate strength of the prestressing tendon, which is determined according to the type of prestressing tendon; Thickness of the width adjustment plate h 1. The reinforcement can be calculated based on the simply supported slabs placed on both sides of the side wall; among them, the segment division of the width adjustment slab needs to fully consider the hoisting capacity of the on-site construction and be determined according to the actual situation; Demolition height H 2. It relates to whether the self-weight of the newly added structural components exceeds the original structure, that is, whether it meets the requirements of formula (3); if it does not exceed, the main arch ring does not need to be reinforced; otherwise, the main arch ring needs to be reinforced by increasing the cross section or by using the hoop method. (3) In the formula, γ 1 represents the unit weight of reinforced concrete; γ 2 The combined density of the infill material and sidewalls; h 1 The thickness of the width adjustment plate is determined by calculation based on a simply supported plate. h 2 is the equivalent thickness of the rib beam and bridge deck, determined according to formula (4); H 2 represents the demolition height; (4) In the formula, h b The thickness of the bridge deck; m The number of ribs; h L The height of the rib beam; α It is the ratio of the width to the height of the rib beam, usually taken as 1 / 4 to 1 / 3; B 1 represents the widened bridge deck width; the demolition height... H 2. Perform the calculation.

7. The design method for the widened solid-web masonry arch bridge deck structure according to claim 6, characterized in that, The main arch and side walls are made of brick or stone; the width adjustment plate is made of reinforced concrete or prestressed concrete; the rib-beam bridge deck is made of reinforced concrete or steel; and the prestressing tendons are made of high-strength steel bars or steel strands.

8. A construction method for a widened solid-web masonry arch bridge deck structure, characterized in that, The construction method for the widened solid-web masonry arch bridge deck structure according to any one of claims 1 to 5 includes the following steps: S 10. Demolish part of the arch structure, including side walls and infill materials of a certain height; S 20 、 Prefabrication of width-adjustable panels at factories or construction sites; S 30. Transport the width adjustment plate to the site and install it in sections on the reserved side walls and infill material; S 40. Use a drilling machine to drill holes in the middle of the side wall, at the corresponding positions of the main arch ring and the width adjustment plate to form channels; S 50. Insert the prestressed tendons into the ducts, tension, anchor, and grout; S 60. Install or pour ribbed bridge deck panels; The installation of the width adjustment plate and the construction of the corresponding prestressing tendons must be carried out in sections, and the construction of the rib beam bridge deck can only be carried out after the prestressing tendons are tensioned.

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