Construction method of arch bridge arch ring overhaul transition platform

Abstract

The invention discloses a construction method of an arch bridge arch ring overhaul transition platform in the technical field of arch bridge overhaul. The construction method comprises the following steps that S1, the intersection position relation of an overhaul channel in the bridge direction and an overhaul channel in the transverse bridge direction is determined; s2, if the overhaul channel face in the bridge direction is higher than or not completely lower than the overhaul channel face in the transverse bridge direction at the corresponding position, a transition platform is installed on the overhaul channel in the bridge direction; if the along-bridge-direction overhaul channel surface is completely lower than the transverse-bridge-direction overhaul channel surface at the corresponding position, a transition platform is installed at the end, close to the along-bridge-direction overhaul channel, of the transverse-bridge-direction overhaul channel; s3, when any one of the three side edges, corresponding to the bridge direction overhaul channel and the transverse bridge direction overhaul channel, of the transition platform is in a suspended state, an inclined ladder is arranged between the side edge and the corresponding bridge direction overhaul channel or the transverse bridge direction overhaul channel under the side edge; the safety of a high-altitude passage is ensured, and potential quality and safety hazards are avoided; and the method has the characteristics of simplicity, practicability, universality, high operability and the like in steel arch bridge overhaul construction.

Description

Technical Field

[0001] The invention relates to the technical field of arch bridge maintenance, and in particular to a construction method for an arch bridge arch ring maintenance transition platform. Background Art

[0002] During the construction of the arch ring maintenance system of an arch bridge, the longitudinal maintenance passage is generally arranged throughout the arch ring, and the longitudinal maintenance passage with a camber will intersect with the transverse maintenance passage at many places. Due to the large number of intersections and the inconsistent horizontal inclinations at different positions, technical processing is required at relevant positions to ensure the formation of the arch ring maintenance system passage and the safe operation of subsequent maintenance personnel.

[0003] During the construction of the project, since the arch ring maintenance system is a non-main structure, the design and construction drawings lack detailed drawings of such positions (nodes), and they are easily overlooked during the manufacturing stage. In particular, there are differences in position and height at the intersection of the longitudinal maintenance channel and the transverse maintenance channel. During the maintenance process, when the two channels need to be interconnected, there will be inconvenience in traffic and greater safety hazards. In the prior art, when the construction of the passage structure at the intersection of the two channels occurs, high-altitude operations are required, further increasing safety hazards. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the technical problem to be solved by the present invention is: how to improve the installation efficiency of the passage structure between the longitudinal inspection channel and the transverse inspection channel of the bridge and improve the safety.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] The construction method of the transition platform for arch bridge arch ring maintenance includes a longitudinal maintenance channel and a transverse maintenance channel, wherein the longitudinal maintenance channel has a preset arch, and the transverse maintenance channel is horizontally arranged and the end of the transverse maintenance channel in the extension direction vertically intersects with the corresponding side of the longitudinal maintenance channel, and comprises the following steps:

[0007] S1: Determine the intersection position relationship between the above-mentioned longitudinal bridge maintenance passage and the above-mentioned transverse bridge maintenance passage;

[0008] S2: If the surface of the longitudinal bridge maintenance passage is higher than or not completely lower than the surface of the transverse bridge maintenance passage at the corresponding position, a transition platform is installed on the longitudinal bridge maintenance passage, and the transition platform is located directly above the extended path of the transverse bridge maintenance passage; if the surface of the longitudinal bridge maintenance passage is completely lower than the surface of the transverse bridge maintenance passage at the corresponding position, the transition platform is installed at the end of the transverse bridge maintenance passage close to the longitudinal bridge maintenance passage, and the transition platform is located above the longitudinal bridge maintenance passage and one side contacts the longitudinal bridge maintenance passage;

[0009] S3: When any of the three sides of the transition platform corresponding to the longitudinal maintenance passage and the transverse maintenance passage is in a suspended state, an inclined ladder is arranged between the side and the longitudinal maintenance passage or the transverse maintenance passage corresponding to the side below.

[0010] Further, in step S1, the intersection form of the above-mentioned longitudinal bridge maintenance passage and the above-mentioned transverse bridge maintenance passage includes three forms A, B and C. Form A: any side edge line of the above-mentioned transverse bridge maintenance passage surface is flush with the above-mentioned longitudinal bridge maintenance passage surface and other positions of the above-mentioned transverse bridge maintenance passage surface are lower than the above-mentioned longitudinal bridge maintenance passage surface at the corresponding position; Form B: on both sides of the intersection line of the above-mentioned transverse bridge maintenance passage surface and the above-mentioned longitudinal bridge maintenance passage surface, the above-mentioned transverse bridge maintenance passage surface on one side is higher than the above-mentioned longitudinal bridge maintenance passage surface, and the above-mentioned transverse bridge maintenance passage surface on the other side is lower than the above-mentioned longitudinal bridge maintenance passage surface; Form C: any side edge line of the above-mentioned transverse bridge maintenance passage surface is flush with the above-mentioned longitudinal bridge maintenance passage surface and other positions of the above-mentioned transverse bridge maintenance passage surface are higher than the corresponding longitudinal bridge maintenance passage surface.

[0011] Further, when it is determined that the intersection position relationship between the above-mentioned longitudinal bridge maintenance passage and the above-mentioned transverse bridge maintenance passage is in the form of A or B, the construction steps in step S2 are selected if the surface of the longitudinal bridge maintenance passage is not completely lower than the surface of the transverse bridge maintenance passage at the corresponding position; when it is determined that the intersection position relationship between the longitudinal bridge maintenance passage and the transverse bridge maintenance passage is in the form of C, the construction steps in step S2 are selected if the surface of the longitudinal bridge maintenance passage is completely lower than the surface of the transverse bridge maintenance passage at the corresponding position.

[0012] Furthermore, the sides of the transition platform corresponding to the front and rear sides of the longitudinal bridge maintenance channel are respectively set as the first side and the second side, and the side of the transition platform corresponding to the transverse bridge maintenance channel is set as the third side; when the intersection position relationship between the longitudinal bridge maintenance channel and the transverse bridge maintenance channel is in the form of A or B, the first side or the second side of the transition platform is set in the longitudinal bridge maintenance channel, and the other two sides are in a suspended state. At this time, inclined ladders are installed on the two suspended sides respectively corresponding to the longitudinal bridge maintenance channel and the transverse bridge maintenance channel below; when the intersection position relationship between the longitudinal bridge maintenance channel and the transverse bridge maintenance channel is in the form of C, the third side of the transition platform is connected to the end of the transverse bridge maintenance channel and is flush with the transverse bridge maintenance channel, either the first side or the second side is connected to the surface of the longitudinal bridge maintenance channel and the other side is suspended, and an inclined ladder is installed between the suspended side and the longitudinal bridge maintenance channel.

[0013] Furthermore, the above-mentioned transition platform and the above-mentioned transverse bridge inspection passage are of equal width and the positions on both sides are aligned in the vertical direction.

[0014] Furthermore, the above-mentioned transition platform is parallel to the above-mentioned cross-bridge maintenance passage.

[0015] Furthermore, the materials of the above-mentioned transition platform, the above-mentioned transverse bridge maintenance passage and the above-mentioned longitudinal bridge maintenance passage are all the same.

[0016] Furthermore, the transition platform and the inclined ladder are both provided with safety guardrails.

[0017] Furthermore, the inclination angle of the above-mentioned inclined ladder does not exceed 60°.

[0018] Furthermore, the step height of the above-mentioned inclined ladder is 220mm-240mm.

[0019] The beneficial effects of the present invention are:

[0020] By systematically making corresponding transition platform construction plans for various intersections between the longitudinal maintenance channel and the transverse maintenance channel, high efficiency of transition platform construction can be achieved; and by setting up relatively simple transition platforms and inclined ladders between the longitudinal maintenance channel and the transverse maintenance channel, construction is convenient, low-cost and safer; during the construction process, construction work only needs to be carried out at the corresponding positions of the longitudinal maintenance channel and the transverse maintenance channel, and there is no need to work at high altitudes, which further improves the safety of the construction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the main view of the transition platform construction structure in the A or B form of the present invention;

[0022] Figure 2 It is a left view schematic diagram of the transition platform construction structure in the A or B form of the present invention;

[0023] Figure 3 It is a top view schematic diagram of the transition platform construction structure in the A or B form of the present invention;

[0024] Figure 4 It is a schematic diagram of the main view of the transition platform construction structure in the C form of the present invention;

[0025] Figure 5 It is a left view schematic diagram of the C-type lower transition platform construction structure in the present invention;

[0026] Figure 6 It is a top view schematic diagram of the C-type lower transition platform construction structure in the present invention;

[0027] Figure 7 It is a schematic diagram of the A form of the present invention;

[0028] Figure 8 It is a schematic diagram of the B form of the present invention;

[0029] Fig. 9 It is a schematic diagram of the C form of the present invention;

[0030] Marked in the figure are, 1-maintenance passage along the bridge, 2-maintenance passage across the bridge, 3-transition platform, 4-inclined ladder. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings.

[0032] according to Figure 1-Figure 9 As shown, the embodiment of the present application proposes a construction method for an arch bridge arch ring maintenance transition platform 3, comprising a longitudinal maintenance channel 1 and a transverse maintenance channel 2, wherein the longitudinal maintenance channel 1 has a preset arch, and the transverse maintenance channel 2 is horizontally arranged and the end of the extension direction vertically intersects with the corresponding side of the longitudinal maintenance channel 1, comprising the following steps:

[0033] S1: Determine the intersection position relationship between the above-mentioned longitudinal inspection channel 1 and the above-mentioned transverse inspection channel 2; by determining the intersection position relationship between the longitudinal inspection channel 1 and the transverse inspection channel 2, since the longitudinal inspection channel 1 is an arch design and is almost inclined in a local position, the transverse inspection channel 2 surface and the longitudinal inspection channel 1 surface have a certain inclination after intersecting, and it may appear that within the width range of the transverse inspection channel 2 surface, the longitudinal inspection channel 1 surface and the transverse inspection channel 2 surface have different heights. Preferably, in this embodiment, the intersection forms of the above-mentioned longitudinal inspection channel 1 and the above-mentioned transverse inspection channel 2 include three forms of A, B and C, such as Figure 7 As shown, form A: any side line of the above-mentioned transverse bridge maintenance channel 2 is flush with the above-mentioned longitudinal bridge maintenance channel 1, and other positions of the above-mentioned transverse bridge maintenance channel 2 are lower than the above-mentioned longitudinal bridge maintenance channel 1 at the corresponding position; Figure 8 As shown, form B: on both sides of the intersection line of the above-mentioned transverse bridge maintenance passage 2 surface and the above-mentioned longitudinal bridge maintenance passage 1 surface, the above-mentioned transverse bridge maintenance passage 2 surface on one side is higher than the above-mentioned longitudinal bridge maintenance passage 1 surface, and the above-mentioned transverse bridge maintenance passage 2 surface on the other side is lower than the above-mentioned longitudinal bridge maintenance passage 1 surface; as shown in FIG. Fig. 9 As shown, form C: any side line of the above-mentioned transverse bridge maintenance channel 2 is flush with the above-mentioned longitudinal bridge maintenance channel 1, and other positions of the above-mentioned transverse bridge maintenance channel 2 are higher than the corresponding longitudinal bridge maintenance channel 1. The three intersection states of the above-mentioned longitudinal bridge maintenance channel 1 and the above-mentioned transverse bridge maintenance channel 2, A, B and C, are the three most common forms, which can basically summarize the existing construction scenarios.

[0034] S2: If the surface of the above-mentioned longitudinal bridge maintenance passage 1 is higher than or not completely lower than the surface of the above-mentioned transverse bridge maintenance passage 2 at the corresponding position, a transition platform 3 is installed on the above-mentioned longitudinal bridge maintenance passage 1, and the above-mentioned transition platform 3 is located directly above the extended path of the above-mentioned transverse bridge maintenance passage 2; if the surface of the above-mentioned longitudinal bridge maintenance passage 1 is completely lower than the surface of the above-mentioned transverse bridge maintenance passage 2 at the corresponding position, the above-mentioned transition platform 3 is installed at the end of the above-mentioned transverse bridge maintenance passage 2 close to the above-mentioned longitudinal bridge maintenance passage 1, and the above-mentioned transition platform 3 is located above the above-mentioned longitudinal bridge maintenance passage 1 and one side contacts the above-mentioned longitudinal bridge maintenance passage 1; that is to say, after the surface of the transverse bridge maintenance passage 2 and the surface of the longitudinal bridge maintenance passage 1 intersect, there is a certain inclination angle, which may appear within the width range of the surface of the transverse bridge maintenance passage 2, and the surface of the longitudinal bridge maintenance passage 1 and the surface of the transverse bridge maintenance passage 2 There are different heights. As long as there is a situation where the surface of the transverse bridge maintenance channel 2 is lower than the surface of the longitudinal bridge maintenance channel 1, a transition platform 3 can be installed on the above-mentioned longitudinal bridge maintenance channel 1, and the above-mentioned transition platform 3 is directly above the extension path of the above-mentioned transverse bridge maintenance channel 2. At this time, one of the two sides along the longitudinal bridge direction of the transition platform 3 is fixed to the surface of the longitudinal bridge maintenance channel 1, and the other side is suspended, and the side close to the transverse bridge maintenance channel 2 is suspended; as long as the surface of the transverse bridge maintenance channel 2 is completely higher than the surface of the longitudinal bridge maintenance channel 1, in this case, the transition platform 3 is directly built on the extended position of the end of the transverse bridge maintenance channel 2 close to the longitudinal bridge maintenance channel 1. At this time, the transition platform 3 is above the corresponding width position of the longitudinal bridge maintenance channel 1. At this time, one of the two sides along the longitudinal bridge direction of the transition platform 3 is fixed to the surface of the longitudinal bridge maintenance channel 1, and the other side is suspended.

[0035] S3: When any of the three sides of the transition platform 3 corresponding to the longitudinal bridge maintenance passage 1 and the transverse bridge maintenance passage 2 is in a suspended state, an inclined ladder 4 is arranged between the above-mentioned side and the corresponding longitudinal bridge maintenance passage 1 or the transverse bridge maintenance passage 2 directly below. Specifically, for the three intersection states A, B and C of the longitudinal bridge maintenance passage 1 and the transverse bridge maintenance passage 2, the sides of the transition platform 3 corresponding to the front and rear sides of the longitudinal bridge maintenance passage 1 are respectively set as the first side and the second side, and the side of the transition platform 3 corresponding to the transverse bridge maintenance passage 2 is set as the third side; when the intersection position relationship between the longitudinal bridge maintenance passage 1 and the transverse bridge maintenance passage 2 is in the form of A or B, as Figure 1-Figure 3 As shown, the first side or the second side of the transition platform 3 is arranged on the longitudinal bridge maintenance passage 1, and the other two sides are in a suspended state. At this time, inclined ladders 4 are installed on the two suspended sides corresponding to the longitudinal bridge maintenance passage 1 and the transverse bridge maintenance passage 2 below; when the intersection position relationship between the longitudinal bridge maintenance passage 1 and the transverse bridge maintenance passage 2 is in the form of C, as shown in FIG. Figure 4-Figure 6As shown, the third side of the transition platform 3 is connected to the end of the transverse bridge maintenance channel 2 and is flush with the transverse bridge maintenance channel 2, either the first side or the second side is connected to the longitudinal bridge maintenance channel 1 and the other side is suspended, and an inclined ladder 4 is installed between the suspended side and the longitudinal bridge maintenance channel 1.

[0036] That is to say, for the three intersection states A, B and C of the aforementioned longitudinal bridge maintenance passage 1 and the aforementioned transverse bridge maintenance passage 2, a transition platform 3 can be directly built on the longitudinal bridge maintenance passage 1 or the aforementioned transverse bridge maintenance passage 2. If any one of the first side, the second side and the third side of the transition platform 3 is suspended, a downward extending inclined ladder 4 will be built on that side and the corresponding longitudinal bridge maintenance passage 1 or the aforementioned transverse bridge maintenance passage 2 below. Specifically, the inclined ladder 4 extends from the transition platform 3 from top to bottom in a direction away from the transition platform 3 and is fixed on the longitudinal bridge maintenance passage 1 or the aforementioned transverse bridge maintenance passage 2.

[0037] Furthermore, the above-mentioned transition platform 3 and the above-mentioned transverse bridge maintenance passage 2 are of equal width and the positions on both sides are aligned in the vertical direction, which is convenient for local materials and can be directly installed between the plates used to build the transverse bridge maintenance passage 2, so as to facilitate the alignment and installation of the transition platform 3 and the transverse bridge maintenance passage 2, thereby improving the convenience and cost of installation. Moreover, the materials of the above-mentioned transition platform 3, the above-mentioned transverse bridge maintenance passage 2 and the above-mentioned longitudinal bridge maintenance passage 1 are the same, and the above-mentioned transition platform 3 and the above-mentioned inclined ladder 4 are both provided with safety guardrails, which are also installed using the guardrail materials of the maintenance passages.

[0038] In order to ensure the safety of the inclined ladder 4, the inclination angle of the inclined ladder 4 does not exceed 60°, so that the safety of the inclined ladder 4 is relatively gentle. When climbing the transition platform 3 from the longitudinal bridge to the maintenance channel 1 or from the transverse bridge to the maintenance channel 2, the slope is relatively small, reducing the risk of falling from the inclined ladder 4 and improving safety. The height of each step is 220mm-240mm, which is comparable to the common step size range and conforms to the habit of ordinary people climbing ladders.

[0039] In summary, the present invention proposes a construction method for a transition platform 3 for arch bridge arch ring maintenance, comprising the following steps: S1: determining the intersection position relationship between the above-mentioned longitudinal bridge maintenance channel 1 and the above-mentioned transverse bridge maintenance channel 2; S2: if the surface of the above-mentioned longitudinal bridge maintenance channel 1 is higher than or not completely lower than the surface of the above-mentioned transverse bridge maintenance channel 2 at the corresponding position, then installing the transition platform 3 on the above-mentioned longitudinal bridge maintenance channel 1, and the above-mentioned transition platform 3 is directly above the extended path of the above-mentioned transverse bridge maintenance channel 2; if the surface of the above-mentioned longitudinal bridge maintenance channel 1 is completely lower than the surface of the above-mentioned transverse bridge maintenance channel 2 at the corresponding position, installing the above-mentioned transition platform 3 at the end of the above-mentioned transverse bridge maintenance channel 2 close to the above-mentioned longitudinal bridge maintenance channel 1, and the above-mentioned transition platform 3 is above the above-mentioned longitudinal bridge maintenance channel 1 and one side contacts the above-mentioned longitudinal bridge maintenance channel 1; S3: when any one of the three sides of the above-mentioned transition platform 3 corresponding to the above-mentioned longitudinal bridge maintenance channel 1 and the above-mentioned transverse bridge maintenance channel 2 is in a suspended state, An inclined ladder 4 is set between the longitudinal bridge maintenance passage 1 or the transverse bridge maintenance passage 2 to solve the height difference at the interface of the longitudinal and transverse bridge maintenance passages, and ensure the safety of the later use and passage of the arch ring maintenance high-altitude operation passage; the intersection position is used as the basis for adding the transition platform 3 to avoid large-scale modifications to the original design plan and form, and only the nodes and practices are supplemented to the relevant parts to improve the rationality and economy of the structural treatment of the specific position of the arch ring maintenance passage; communicate and communicate with the design in advance before construction, and construct the transition platform 3 in the production link after confirmation to avoid the adjustment and modification of the completed components in the later stage; solve the problems of construction, technology and process of the arch ring maintenance passage; the setting of the transition platform 3 eliminates the problem of insufficient design depth of the maintenance system in the manufacturing link; in the later use link, when the maintenance paths intersect, the transition platform 3 is used for conversion to ensure the safety of the high-altitude passage and avoid quality and safety hazards left by the completion inspection; it has the characteristics of simplicity, practicality, generality and strong operability in the construction of the maintenance system of the steel arch bridge project.

Claims

1. A construction method for an arch bridge arch ring maintenance transition platform, comprising a longitudinal maintenance channel and a transverse maintenance channel, wherein the longitudinal maintenance channel has a preset arch, and the transverse maintenance channel is horizontally arranged and the end of the extension direction vertically intersects with the corresponding side of the longitudinal maintenance channel, characterized in that: The following steps are involved: S1: Determine the intersection position relationship between the longitudinal maintenance passage and the transverse maintenance passage; S2: If the surface of the longitudinal bridge maintenance passage is higher than or not completely lower than the surface of the transverse bridge maintenance passage at the corresponding position, a transition platform is installed on the longitudinal bridge maintenance passage, and the transition platform is directly above the extended path of the transverse bridge maintenance passage; if the surface of the longitudinal bridge maintenance passage is completely lower than the surface of the transverse bridge maintenance passage at the corresponding position, the transition platform is installed at the end of the transverse bridge maintenance passage close to the longitudinal bridge maintenance passage, and the transition platform is above the longitudinal bridge maintenance passage and one side contacts the longitudinal bridge maintenance passage; S3: When any of the three sides of the transition platform corresponding to the longitudinal bridge maintenance passage and the transverse bridge maintenance passage is in a suspended state, an inclined ladder is arranged between the side and the longitudinal bridge maintenance passage or the transverse bridge maintenance passage corresponding thereto directly below.

2. The construction method of the transition platform for arch bridge arch ring maintenance according to claim 1 is characterized in that: In step S1, the intersection forms of the longitudinal maintenance passage and the transverse maintenance passage include three forms A, B and C. Form A: any side edge line of the transverse maintenance passage surface is flush with the longitudinal maintenance passage surface and other positions of the transverse maintenance passage surface are lower than the longitudinal maintenance passage surface at the corresponding positions; Form B: on both sides of the intersection line of the transverse maintenance passage surface and the longitudinal maintenance passage surface, the transverse maintenance passage surface on one side is higher than the longitudinal maintenance passage surface, and the transverse maintenance passage surface on the other side is lower than the longitudinal maintenance passage surface; Form C: any side edge line of the transverse maintenance passage surface is flush with the longitudinal maintenance passage surface and other positions of the transverse maintenance passage surface are higher than the corresponding longitudinal maintenance passage surface.

3. The construction method of the transition platform for arch bridge arch ring maintenance according to claim 2 is characterized in that: When it is determined that the intersection position relationship between the longitudinal bridge maintenance passage and the transverse bridge maintenance passage is in the form of A or B, the construction steps in step S2 are selected if the surface of the longitudinal bridge maintenance passage is not completely lower than the surface of the transverse bridge maintenance passage at the corresponding position; when it is determined that the intersection position relationship between the longitudinal bridge maintenance passage and the transverse bridge maintenance passage is in the form of C, the construction steps in step S2 are selected if the surface of the longitudinal bridge maintenance passage is completely lower than the surface of the transverse bridge maintenance passage at the corresponding position.

4. The construction method of the transition platform for arch bridge arch ring maintenance according to claim 3 is characterized in that: The sides of the transition platform corresponding to the front and rear sides of the longitudinal bridge maintenance channel are respectively set as the first side and the second side, and the side of the transition platform corresponding to the transverse bridge maintenance channel is set as the third side; when the intersection position relationship between the longitudinal bridge maintenance channel and the transverse bridge maintenance channel is in the form of A or B, the first side or the second side of the transition platform is set in the longitudinal bridge maintenance channel, and the other two sides are in a suspended state. At this time, inclined ladders are installed on the two suspended sides respectively corresponding to the longitudinal bridge maintenance channel and the transverse bridge maintenance channel below; when the intersection position relationship between the longitudinal bridge maintenance channel and the transverse bridge maintenance channel is in the form of C, the third side of the transition platform is connected to the end of the transverse bridge maintenance channel and is flush with the transverse bridge maintenance channel, either the first side or the second side is connected to the surface of the longitudinal bridge maintenance channel and the other side is suspended, and an inclined ladder is installed between the suspended side and the longitudinal bridge maintenance channel.

5. The construction method of the transition platform for arch bridge arch ring maintenance according to any one of claims 1 to 4, characterized in that: The transition platform and the transverse bridge inspection passage are of equal width and the positions on both sides are aligned in the vertical direction.

6. The construction method of the transition platform for arch bridge arch ring maintenance according to claim 5 is characterized in that: The materials of the transition platform, the transverse bridge maintenance passage and the longitudinal bridge maintenance passage are all the same.

7. The construction method of the transition platform for arch bridge arch ring maintenance according to claim 5 is characterized in that: The transition platform and the inclined ladder are both provided with safety guardrails.

8. The construction method of the transition platform for arch bridge arch ring maintenance according to claim 5 is characterized in that: The inclination angle of the inclined ladder does not exceed 60°.

9. The construction method of the transition platform for arch bridge arch ring maintenance according to claim 8 is characterized in that: The step height of the inclined ladder is 220mm-240mm.

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