A reinforced structure for the main arch ring structure of a deck-type hollow arch bridge and its construction method

Abstract

The present invention relates to the technical field of bridge reinforcement engineering, and in particular to a top-supported hollow arch bridge arch ring structure reinforcement structure and a construction method thereof. The top-supported hollow arch bridge main arch ring structure reinforcement structure comprises a carbon fiber reinforcement layer adhered to the lower surface of the main arch ring, a reinforced concrete structure layer provided under the carbon fiber reinforcement layer, and a composite material protective shell covering the upper surface of the main arch ring; the composite material protective shell comprises a flat plate with mortise and tenon joints at both ends, an arc-shaped vertical plate, an arc-shaped side plate and a tenon; the composite material protective shell is combined into different cross-sections by mortise and tenon joints, and serves as both a concrete formwork and an arch top surface protective layer. The present invention greatly simplifies the difficulty of reinforcing the arch ring structure of a cross-river arch bridge by adopting a high-performance and durable protective layer that also has the function of a permanent formwork and an arch ring ribbed reinforced concrete structure system. At the same time, it does not require circuit breaker construction and is widely applicable to the reinforcement construction of cross-river arch bridge structures.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge reinforcement engineering, and in particular to a main arch ring structure reinforcement of a deck-type hollow arch bridge and a construction method thereof. Background Art

[0002] Over the past 70 years since the founding of the People's Republic of China, my country has built a large number of bridges. According to incomplete statistics, over 40,000 arch bridges have been built, and most are now in maintenance and in need of structural reinforcement. This is especially true for older bridges that span rivers and are subject to perennial water erosion. For deck arch bridges, the main arch ring, as the most critical structural component, is also the primary area for reinforcement.

[0003] At present, the main arch ring reinforcement methods are mainly steel bonding method, carbon fiber bonding method, and cross-section increase method. All of the above methods can be understood as a special case of the arch bottom cross-section increase method, but these methods all have three problems: on the one hand, due to the increase in the deadweight of the lower part of the structure, there is a "stress lag effect" caused by the interface between the old and new structures and the staged force, the reinforced structure part often has low material performance efficiency, and there is a problem of "a small horse pulling a big cart"; on the other hand, because the arch bottom construction is a reverse-angle working surface, there are also problems with the construction surface construction and construction organization, which also brings greater challenges to the arch bottom construction, which already has high technical requirements for the surface treatment of the old structure due to the interface between the old and new structures. Especially when the reinforced bridge is a river bridge, it is impossible to set up scaffolding at the bottom of the arch ring to continue the work.

[0004] In addition, carbon fiber reinforcement technology has been widely used in the field of structural reinforcement due to its excellent tensile mechanical properties, which combines the convenience of construction with the risk of damaging existing structures. However, it is less used in arch bridge reinforcement projects. This is mainly because the arch ring is an ideal eccentrically compressed member, which is significantly different from the tensile reinforcement application scenario where carbon fiber reinforcement technology excels. Therefore, it is mostly used as an auxiliary means to repair local cracks in the arch ring or improve the local bearing capacity of the tensile zone. However, the fiber-reinforced composite materials involved in carbon fiber reinforcement technology have good durability and can simultaneously enhance the structural resistance and isolate the corrosion of environmental media to improve the durability of structural components. They are relatively more suitable for the field of municipal facility maintenance, especially bridge structure reinforcement. On the other hand, carbon fiber materials are relatively expensive, making them inconvenient for large-scale application. However, there are fiber-reinforced composite materials with other high-performance fibers, such as glass fiber, that have weaker mechanical properties than carbon fiber but are relatively cheaper. Therefore, when component repair is mainly for durability repair, it has the conditions for large-scale application.

[0005] In addition, one of the important factors causing cracking in existing concrete arch bridge structures is longitudinal cracks in the arch ring due to the arch ring's long-term exposure to an uneven heating environment caused by sunlight. These cracks often occur in older arch bridges with less transverse reinforcement, which often have high cultural heritage protection value. Fiber-reinforced composite materials have low thermal conductivity and high specific heat capacity, making them an excellent thermal insulation material. Covering the heated surface of the arch ring with them will significantly reduce the impact of uneven temperature stress on the concrete arch ring caused by sunlight and ambient temperature changes, while also isolating the aging effects of air and moisture on the structural material. It is worth noting that the excellent mechanical properties and water-enhancing surface polarity characteristics of fiber-reinforced composite materials can also be used as fair-faced concrete formwork.

[0006] Based on the above technical problems and the characteristics of the existing technology, the present invention aims to propose a top-supported hollow arch bridge arch ring structure reinforcement and a construction method thereof, which adopts a composite material protective shell connected by mortise and tenon joints, which can be used as a concrete pouring mold during arch bottom construction, and can also be used as a structural durability protection shell. While it provides better construction convenience for on-site construction by avoiding the need to dismantle the permanent concrete formwork, it protects the arch ring from external corrosive media and reduces the influence of environmental temperature stress, so that the reinforced arch ring has better structural durability. Summary of the Invention

[0007] The purpose of the present invention is to overcome the above problems and provide a top-decker hollow arch bridge arch ring structure reinforcement and a construction method thereof.

[0008] To achieve the above-mentioned purpose, the method adopted by the present invention is: a main arch ring structure reinforcement structure of an upper-supported hollow arch bridge, including a carbon fiber reinforcement layer adhered to the lower surface of the main arch ring, a reinforced concrete structure layer arranged under the carbon fiber reinforcement layer, and a composite material protective shell covering the upper surface of the main arch ring; the composite material protective shell includes a flat plate with mortise and tenon openings at both ends, an arc-shaped vertical plate with mortise and tenon openings at both ends, an arc-shaped side plate with mortise and tenon openings at both ends, and a tenon; the composite material protective shell is also used as a casting template when casting the reinforced concrete structure layer.

[0009] As an improvement of the present invention, the reinforced concrete structural layer includes longitudinal reinforcement arranged along the span direction of the main arch ring, transverse stirrups arranged radially along the main arch ring and connected to the longitudinal reinforcement, and shear reinforcement and concrete implanted radially into the bottom surface of the main arch ring and evenly arranged in both directions along the width and span of the main arch ring.

[0010] As an improvement of the present invention, the carbon fiber reinforcement layer includes carbon fiber and high-performance engineering resin, and the carbon fiber is pasted on the unidirectional carbon fiber cloth along the longitudinal direction of the bottom surface of the arch ring, and the fiber direction of the unidirectional carbon fiber cloth is the same as the longitudinal direction of the arch ring.

[0011] As an improvement of the present invention, the composite material protective shell is provided with a concrete pouring hole and an observation hole. The composite material protective shell is made of reinforced fiber cloth or felt, high-performance engineering resin and a UV-resistant protective coating on its outer surface.

[0012] As an improvement of the present invention, the cross-section of the composite material protective shell, when used as a casting template, is a multi-rib cross-section or a uniform cross-section according to the design; when used as a vault covering layer, it is a uniform cross-section, its longitudinal length is determined according to the construction length of the actual casting section, its width is the same as the width of the arch ring, and arc-shaped side panels with higher heights are provided at both ends of the cross-section, which are fixed to the edges of both sides of the arch ring.

[0013] As an improvement of the present invention, a construction method for reinforcing the main arch ring structure of a top-supported hollow arch bridge is provided. The sub-items of the construction method include three steps in sequence: first, construction of a carbon fiber reinforcement layer at the arch bottom; second, construction of a reinforced concrete structural layer at the arch bottom; and third, construction of a composite material protective shell at the arch top. The construction sequence of each step is to start from the arch feet at both ends of the arch ring and then proceed in sequence to the mid-span work section of the arch ring. The length of the work section is determined according to the actual construction plan. At the same time, the construction of the reinforced concrete structural layer can only begin after the carbon fiber reinforcement construction of the entire span arch bottom is completed.

[0014] As an improvement of the present invention, a construction method for reinforcing the main arch ring structure of an upper-supported hollow arch bridge is provided, wherein the composite material protective shell is disassembled from the mortise and tenon joints for assembly in different cross-sectional forms according to actual needs of use or size; it is used as a concrete pouring formwork during the construction stage of the reinforced concrete structure layer at the arch bottom; after the concrete reaches the demoulding strength, the composite material protective shell previously used as the concrete pouring formwork is removed, disassembled along the mortise and tenon joints, and reassembled into a composite material protective shell with both side panels fixed downward to the side surfaces of the main arch ring and with the same cross-sectional form covering the arch top.

[0015] As an improvement of the present invention, a construction method for reinforcing the main arch ring structure of an upper-supported hollow arch bridge is provided, wherein the composite material protective shell is disassembled from the mortise and tenon joints for assembly in different cross-sectional forms according to actual needs of use or size; it is used as a concrete pouring formwork during the construction stage of the reinforced concrete structure layer at the arch bottom; after the concrete reaches the demoulding strength, the composite material protective shell previously used as the concrete pouring formwork is removed, disassembled along the mortise and tenon joints, and reassembled into a composite material protective shell with both side panels fixed downward to the side surfaces of the main arch ring and with the same cross-sectional form covering the arch top.

[0016] As an improvement of the present invention, a construction method for reinforcing the main arch ring structure of a deck-type hollow arch bridge is characterized in that the specific installation steps are as follows:

[0017] s1, construction of carbon fiber reinforcement layer at arch bottom:

[0018] a. Install the arch bottom construction hanging basket;

[0019] b. Repair the existing structural damage at the arch bottom;

[0020] c. Starting from the arch feet on both sides of the arch ring, carbon fiber reinforcement is simultaneously applied to the arch bottom until it converges at the mid-span;

[0021] s2, construction of reinforced concrete structure layer at arch bottom:

[0022] a. Start planting reinforcement in sections from the arch feet on both sides simultaneously;

[0023] I. First, implant shear reinforcement at the bottom of the arch ring;

[0024] II, longitudinal reinforcement tied to shear reinforcement;

[0025] III, finally tie the stirrups;

[0026] b. After all the steel bars of a section are tied, the composite material protective shell pre-assembled according to the needs of the section is temporarily fixed to the side of the arch ring;

[0027] c. Then, use a clamp to fix the arch ring and the composite material protective shell, ensuring that the distance between its inner surface and the bottom surface of the arch ring meets the design thickness requirements of the reinforced concrete structure layer;

[0028] d. Repeat steps I to III to tie the steel bars of the next section;

[0029] e. pouring concrete into the mold cavity formed by the composite material protective shell through the preset pouring holes on the composite material protective shell;

[0030] g. After the concrete in this section reaches the demoulding strength, remove the clamps and the composite material protective shell of this section, and repeat steps b to e for the next section until the mid-span section is completed;

[0031] S3, vault composite protective shell construction:

[0032] h. Clean the top surface of the arch ring between the hollow section columns and repair the structural damage and cracks;

[0033] i. Reassembling the composite material protective shell removed in step e into a composite material protective shell with a uniform cross-section;

[0034] j, and then cover the composite material protective shell of this section to the top surface of the arch ring section by section;

[0035] k. Fix the side panels on both sides of the composite protective shell to both sides of the main arch ring, and use carbon fiber cloth to reinforce the corners at the intersection of the composite protective shell and the hollow column;

[0036] 1. Repeat steps h to j, starting from the arch feet on both sides toward the mid-span, until the top surfaces of the arch rings of all hollow sections are covered with the composite protective shell.

[0037] Compared with the prior art, the present invention has the following advantages:

[0038] 1. The present invention overcomes the problem that the traditional arch ring reinforcement method needs to be constructed on the bottom surface of the arch ring and the construction work is difficult by arranging the arch ring vault ribbed reinforced concrete slab in the hollow area. While utilizing the characteristics of the new structure's own weight and the new working surface to facilitate construction operations and weaken the influence of the interface factors of the new and old components on the reinforcement effect, the present invention utilizes the stress characteristics of the arch ring as an ideal eccentrically compressed component to further improve the structural efficiency of the reinforced structure and make the reinforced structure system more reasonable.

[0039] 2. The high-performance durable protective layer involved in the present invention overcomes the traditional structural reinforcement that only pursues to meet the structural performance requirements. While completing the structural reinforcement, it also achieves the effect of improving durability by isolating the contact between the environmental medium and the arch ring structure surface. At the same time, the high-performance durable protective layer also utilizes its own good thermal and mechanical properties. While isolating the uneven temperature load, it also plays a role in restraining the radial deformation of the hollow section arch ring, achieving good results in controlling the longitudinal cracks of the arch ring.

[0040] 3. The present invention greatly simplifies the difficulty of reinforcing the arch ring structure of the river-crossing arch bridge by adopting a high-performance durable protective layer with permanent formwork function and a ribbed reinforced concrete structure system for the arch ring and arch top. At the same time, there is no need to interrupt the circuit for construction, and it is widely applicable to the arch bottom construction of the river-crossing arch bridge.

[0041] The invention can be widely applied to the construction of main arch ring reinforcement engineering of top-decker hollow arch bridges. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The advantages of the above and / or additional aspects of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0043] Figure 1 This is the overall completed effect diagram of the present invention in bridge application.

[0044] Figure 2 This is a cross-sectional rendering of the completed main arch ring in bridge applications of the present invention.

[0045] Figure 3 This is a cross-sectional rendering of the concrete structure layer construction in bridge applications of the present invention.

[0046] Figure 4 This is a combined cross-sectional view of a composite protective shell with a ribbed cross-section used in bridge applications of the present invention.

[0047] Figure 5This is a combined cross-sectional view of a composite protective shell of equal height cross-section in bridge applications of the present invention.

[0048] in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 The corresponding relationship between the figure marks and the component names is as follows.

[0049] Figure numerals: 1, carbon fiber reinforcement layer; 2, reinforced concrete structural layer; 3, composite material protective shell; 31, flat plate; 32, curved vertical plate; 33, curved side plate; 34, tenon; 35, mortise and tenon joint; 21, longitudinal reinforcement; 22, stirrups; 23, shear reinforcement; 4, main arch ring; 5, hoop. Specific implementation plan

[0050] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features therein can be combined with each other without conflict.

[0051] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 ,and Figure 5 As shown, the present invention provides a reinforcement structure for the main arch ring structure of an upper-supported hollow arch bridge, comprising a carbon fiber reinforcement layer 1 adhered to the lower surface of the main arch ring, a reinforced concrete structure layer 2 arranged under the carbon fiber reinforcement layer 1, and a composite material protective shell 3 covering the upper surface of the main arch ring 4; the composite material protective shell 3 comprises a flat plate 31 with mortise and tenon openings at both ends, an arc-shaped vertical plate 32 with mortise and tenon openings at both ends, an arc-shaped side plate 33 with mortise and tenon openings at both ends, and a tenon 34; the composite material protective shell 3 is also used as a casting template when casting the reinforced concrete structure layer 2.

[0052] In this embodiment, the reinforced concrete structural layer 2 includes longitudinal reinforcement 21 arranged along the span direction of the main arch ring 4, transverse stirrups 22 arranged radially along the main arch ring and connected to the longitudinal reinforcement, and shear reinforcement 23 and concrete implanted in the bottom surface of the main arch ring radially and evenly arranged in both directions along the width and span of the main arch ring.

[0053] In this embodiment, a method for reinforcing the main arch ring structure of a top-supported hollow arch bridge is characterized in that: the carbon fiber reinforcement layer 1 includes carbon fiber and high-performance engineering resin, and the carbon fiber is adhered to a unidirectional carbon fiber cloth along the longitudinal direction of the bottom surface of the arch ring, and the fiber direction of the unidirectional carbon fiber cloth is the same as the longitudinal direction of the main arch ring 4.

[0054] In this embodiment, the composite material protective shell 3 is provided with a concrete pouring hole and an observation hole. The composite material protective shell 3 is made of reinforced fiber cloth or felt, high-performance engineering resin and a UV-resistant protective coating on its outer surface.

[0055] In this embodiment, the composite material protective shell 3, when used as a casting template, has a cross-section of multiple ribs or a uniform height section according to the design; when used as a vault covering layer, it has a uniform height section, the longitudinal length of which is determined according to the construction length of the actual casting section, and the width is the same as the width of the arch ring, and arc-shaped side panels 33 with higher heights are provided at both ends of the cross-section, which are fixed to the edges of both sides of the arch ring.

[0056] In this embodiment, the sub-items of the construction method include three steps in sequence: first, construction of the carbon fiber reinforcement layer 1 at the bottom of the arch; second, construction of the reinforced concrete structure layer 2 at the bottom of the arch; and third, construction of the composite material protective shell 3 at the top of the arch. The construction order of each step is to start from the arch feet at both ends of the arch ring, and then proceed to the mid-span section of the main arch ring 4 in sequence. The length of the section is determined according to the actual construction plan. At the same time, the construction of the reinforced concrete structure layer 2 can only be started after the construction of the carbon fiber reinforcement layer 1 at the bottom of the entire span is completed.

[0057] In this embodiment, the composite material protective shell 3 is disassembled from the mortise and tenon joints 35 and assembled in different cross-sectional forms according to actual needs of use or size; it is used as a concrete pouring formwork during the construction stage of the reinforced concrete structure layer 2 at the arch bottom. After the concrete reaches the demolding strength, the composite material protective shell 3 previously used as a concrete pouring formwork is removed, disassembled along the mortise and tenon joints 35, and reassembled into a composite material protective shell 3 with equal cross-sectional forms with side panels on both sides fixed downward to the side of the main arch ring and covering the arch top.

[0058] In this embodiment, a construction method for reinforcing the main arch ring structure of a deck-type hollow arch bridge is provided. The specific installation steps are as follows:

[0059] s1, construction of arch bottom carbon fiber reinforcement layer 1:

[0060] a. Install the arch bottom construction hanging basket;

[0061] b. Repair the existing structural damage at the arch bottom;

[0062] c. Starting from the arch feet on both sides of the arch ring, carbon fiber reinforcement is simultaneously applied to the arch bottom until it converges at the mid-span;

[0063] s2, construction of arch bottom reinforced concrete structure layer 2:

[0064] a. Start planting reinforcement in sections from the arch feet on both sides simultaneously;

[0065] I. First, implant shear reinforcement 23 on the bottom surface of the arch ring;

[0066] II, longitudinal reinforcement 21 tied on shear reinforcement 23;

[0067] III, finally tie the stirrups 22;

[0068] b. After all the steel bars of a section are tied, the composite material protective shell 3 pre-assembled according to the needs of the section is temporarily fixed to the side of the arch ring and used as a concrete mold;

[0069] c. Then, use a clamp 5 to fix the arch ring and the composite material protective shell 3, ensuring that the distance between its inner surface and the bottom surface of the main arch ring 4 meets the design thickness requirements of the reinforced concrete structure layer 2;

[0070] d. Repeat steps I to III to tie the steel bars of the next section;

[0071] e. pouring concrete into the mold cavity formed by the composite material protective shell 3 through the preset pouring holes on the composite material protective shell 3;

[0072] g. After the concrete in this section reaches the demoulding strength, remove the hoop 5 and the composite material protective shell 3 of this section, and repeat steps b to e for the next section until the mid-span section is completed;

[0073] S3, Vault Composite Protective Shell 3 Construction:

[0074] h. Clean the top surface of the arch ring between the hollow section columns and repair the structural damage and cracks;

[0075] i. Reassemble the composite material protective shell 3 disassembled in step e into a composite material protective shell 3 with a uniform cross-section;

[0076] j, and then cover the composite material protective shell 3 of this section to the top surface of the main arch ring 4 section by section;

[0077] k, fix the side panels on both sides of the composite protective shell 3 to both sides of the main arch ring 4, and use carbon fiber cloth to reinforce the corners at the intersection of the composite protective shell 3 and the hollow column;

[0078] 1. Repeat steps h to j, starting from the arch feet on both sides toward the mid-span, until the top surfaces of the arch rings of all hollow sections are covered with the composite material protective shell 3.

[0079] The above is only a specific implementation method of the present invention, but the scope of protection of this patent is not limited to this. Any modification or replacement made by any technician familiar with this technical field within the technical solution or inventive concept of this patent should fall within the scope of protection of this patent.

Claims

1. A construction method for reinforcing the main arch ring structure of a deck-type hollow arch bridge, characterized by: The construction method includes three parts in sequence: first, the construction of the carbon fiber reinforcement layer at the arch bottom; second, the construction of the reinforced concrete structure layer at the arch bottom; and third, the construction of the composite material protective shell at the arch top. The construction sequence of each part is to start from the arch feet at both ends of the arch ring and then proceed in sections towards the mid-span of the arch ring. The length of the section is determined according to the actual construction plan. At the same time, the construction of the reinforced concrete structure layer can only begin after the carbon fiber reinforcement construction of the entire span arch bottom is completed. The composite material protective shell is disassembled from the mortise and tenon joints to be assembled in different cross-sectional forms according to actual needs of use or size; it is used as a concrete pouring formwork during the construction phase of the reinforced concrete structure layer at the arch bottom. After the concrete reaches the demoulding strength, the composite material protective shell previously used as the concrete pouring formwork is removed and disassembled along the mortise and tenon joints to reassemble the composite material protective shell with the side panels fixed downward to the side of the main arch ring and the same cross-sectional form covering the arch top; The specific installation steps are as follows: s1, construction of carbon fiber reinforcement layer at arch bottom: a. Install the arch bottom construction hanging basket; b. Repair the existing structural damage at the arch bottom; c. Starting from the arch feet on both sides of the arch ring, carbon fiber reinforcement is simultaneously applied to the arch bottom until it converges at the mid-span; s2, construction of arch bottom concrete structure layer: a. Start planting reinforcement in sections from the arch feet on both sides simultaneously; I. First, implant shear reinforcement at the bottom of the arch ring; II, longitudinal reinforcement tied to shear reinforcement; III, finally tie the stirrups; b. After all the steel bars of a section are tied, the composite material protective shell pre-assembled according to the needs of the section is temporarily fixed to the side of the arch ring; c. Then, use a clamp to fix the arch ring and the composite protective shell, ensuring that the distance between its inner surface and the bottom surface of the arch ring meets the design thickness requirements of the concrete structure layer; d. Repeat steps I to III to tie the steel bars of the next section; e. pouring concrete into the mold cavity formed by the composite material protective shell through the preset pouring holes on the composite material protective shell; g. After the concrete in this section reaches the demoulding strength, remove the clamps and the composite material protective shell of this section, and repeat steps b to e for the next section until the mid-span section is completed; S3, vault composite protective shell construction: h. Clean the top surface of the arch ring between the hollow section columns and repair the structural damage and cracks; i. Reassembling the composite material protective shell removed in step e into a composite material protective shell with a uniform cross-section; j. Then, the composite material protective shell of this section is covered on the top surface of the arch ring section by section; k. Fix the side panels on both sides of the composite protective shell to both sides of the main arch ring, and use carbon fiber cloth to reinforce the corners at the intersection of the composite protective shell and the hollow column; 1. Repeat steps h to j, starting from the arch feet on both sides toward the mid-span, until the top surfaces of the arch rings of all hollow sections are covered with the composite protective shell.

2. The construction method for reinforcing the main arch ring structure of a deck-type hollow arch bridge according to claim 1, characterized in that: The main arch ring structure reinforcement structure of the deck-type hollow arch bridge includes a carbon fiber reinforcement layer attached to the lower surface of the main arch ring, a reinforced concrete structure layer arranged below the carbon fiber reinforcement layer, and a composite material protective shell covering the upper surface of the main arch ring; The composite material protective shell includes a flat plate with mortise and tenon joints at both ends, an arc-shaped vertical plate with mortise and tenon joints at both ends, an arc-shaped side plate with mortise and tenon joints at both ends, and a tenon; The composite material protective shell is combined into different cross sections through mortise and tenon joints, and can be used as a template when pouring concrete, or as a protective layer of the arch ring structure.

3. The construction method for reinforcing the main arch ring structure of a deck-type hollow arch bridge according to claim 1, characterized in that: The reinforced concrete structural layer includes longitudinal reinforcement arranged along the span direction of the main arch ring, transverse stirrups arranged radially along the main arch ring and connected to the longitudinal reinforcement, and shear reinforcement and concrete implanted radially into the bottom surface of the main arch ring and evenly arranged in both directions along the width and span of the main arch ring.

4. The construction method for reinforcing the main arch ring structure of a deck-type hollow arch bridge according to claim 1 is characterized by: The carbon fiber reinforcement layer includes carbon fiber and high-performance engineering resin, and the carbon fiber is pasted on the unidirectional carbon fiber cloth along the longitudinal direction of the bottom surface of the arch ring, and the fiber direction of the unidirectional carbon fiber cloth is the same as the longitudinal direction of the arch ring.

5. The construction method for reinforcing the main arch ring structure of a deck-type hollow arch bridge according to claim 1 is characterized by: The composite material protective shell is provided with a concrete pouring hole and an observation hole. The composite material protective shell is made of reinforced fiber cloth or felt, high-performance engineering resin and a UV-resistant protective coating on its outer surface.

6. The construction method for reinforcing the main arch ring structure of a deck-type hollow arch bridge according to claim 1, characterized in that: The composite material protective shell, when used as a casting template, has a multi-rib section or a uniform section according to the design; when used as a vault covering layer, it has a uniform section, its longitudinal length is determined according to the construction length of the actual casting section, its width is the same as the width of the arch ring, and high-height arc-shaped side plates are provided at both ends of the section, which are fixed to the edges of the arch ring on both sides.

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