Method for replacing breast board of operation line

Abstract

The invention relates to a breast board replacement method for an operation line. The method comprises the following steps: cutting off a breast board at a disease position; vertical column embedded steel bars used for being connected with the newly-arranged vertical columns are arranged on the bridge floor corresponding to the cut-off positions, and the positions of the embedded steel bars are staggered from the positions of the existing vertical columns; prefabricated newly-arranged stand columns and first prefabricated breast boards are installed at the positions where the stand columns are embedded with the steel bars, and the first prefabricated breast boards and the newly-arranged stand columns are poured into an integral structure; the existing stand columns between the newly-arranged stand columns on the two sides are cut off; and a second prefabricated breast board is spliced between the first prefabricated breast boards newly arranged on the two sides. The invention has the advantages that: 1) the existing cable bracket is not influenced, the cable bracket can be switched after a new breast board upright post is mounted, and the influence on the operation is small; the later-stage noise barrier overhaul cost is saved, the load of the main body structure is not increased, meanwhile, the later-stage environment requirement is met, the stress requirement for increasing the noise barrier is met, the durability can reach the same service life as the main body structure, and installation under the condition that an operation line lacks mechanical operation is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of rail transit guardrails, and in particular to a method for replacing guardrails of an operating line. Background Art

[0002] As rail transit operation time increases, it is inevitable that the guardrails of existing lines will be damaged during maintenance. Generally speaking, existing lines generally use cast-in-place thin-walled structures, and their construction quality is difficult to guarantee. Moreover, after long-term operation, the structure is damaged, the steel bars are seriously exposed, and the external drip structures often fall and hit the ground vehicles, causing property losses. Summary of the invention

[0003] The purpose of the present invention is to provide a method for replacing the guardrails of an operating line based on the above-mentioned deficiencies of the prior art. Without affecting the operation of rail transit, segmented prefabricated thin-walled ultra-high-strength material guardrails are used to replace the guardrails that have exceeded their service life and are severely damaged, posing a safety hazard of falling. Sound barrier embedded parts are simultaneously set to save investment in subsequent sound barrier overhauls.

[0004] The purpose of the present invention is achieved by the following technical solutions: A method for replacing a guardrail of an operating line is used to replace an existing guardrail that has exceeded its service life and is severely damaged, causing a potential safety hazard of falling. The existing guardrail is provided with an existing column, and is characterized in that the method for replacing the guardrail comprises the following steps: Cut off the railings where the disease occurs; Planting reinforcement bars for connecting newly erected columns on the bridge deck corresponding to the cut-off position, wherein the position of the planted reinforcement bars is staggered with the position of the existing columns; Installing a prefabricated new column at the position where the column is embedded with reinforcement and a first prefabricated guardrail cast as an integral structure with the new column; Cut off the existing columns between the new columns on both sides; The second prefabricated guardrail is assembled between the first prefabricated guardrails newly arranged on both sides.

[0005] Before the existing columns are removed, cable brackets are installed on the newly erected columns on both sides, and the cables on the existing columns are moved to the newly erected columns.

[0006] Sound barrier embedded parts for connecting with the sound barrier are embedded in the newly installed guardrail.

[0007] A wire mesh is arranged inside the newly installed guardrail, and a part of the newly installed guardrail is cantilevered outside the bridge cantilever as a drip structure.

[0008] The newly established column adopts a hollow section, and its hollow section is sleeved on the periphery of the column embedded reinforcement, and the newly established column is connected to the bridge deck by post-casting ultra-high-strength concrete material.

[0009] The newly erected column can be divided into a plurality of prefabricated column segments along its height direction, and a plurality of the prefabricated column segments are assembled to form the newly erected column.

[0010] The first prefabricated guardrail of the prefabricated column and the second prefabricated guardrail are connected via a plate assembly joint.

[0011] Advantages of the present invention: 1) The replacement is carried out at the end of operation, and the new columns are staggered with the existing columns. The existing cable brackets are not affected during the replacement process. The cable brackets can be switched after the new guardrail columns are installed, which has little impact on operations; 2) The newly replaced guardrails can be equipped with embedded sound barrier parts at the same time, which can be carried out simultaneously with the overhaul of the sound barrier, saving the cost of the later overhaul of the sound barrier; 3) The newly replaced guardrails are prefabricated and assembled using ultra-high-strength materials, which does not increase the load on the main structure while meeting the later environmental requirements to increase the force requirements of the heightened sound barrier. The durability can reach the same lifespan as the main structure, avoiding replacement later; 4) A single prefabricated column can be divided into three or more pieces in the height direction, and the weight of a single piece can be controlled within 60kg, which is convenient for installation under operating lines without mechanical operation conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The construction steps of the present invention Figure I ; Figure 2 The construction steps of the present invention Figure II ; Figure 3 The construction steps of the present invention Figure III ; Figure 4 The construction steps of the present invention Figure IV ; Figure 5 The construction steps of the present invention Figure V . DETAILED DESCRIPTION

[0013] The features of the present invention and other related features are further described in detail below through embodiments in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art: like Figure 1-5 As shown, numbers 1-8 in the figure respectively represent: existing column 1, existing guardrail 2, newly established column 3, first prefabricated guardrail 4, second prefabricated guardrail 5, plate assembly joint 6, column embedded reinforcement 7, and cut-out portion 8.

[0014] Example: Figures 1 to 5 As shown, the guardrail replacement structure of the operating line in this embodiment is used to replace the guardrails that have exceeded their service life, are severely damaged and pose a safety hazard of falling, and sound barrier embedded parts can be set simultaneously.

[0015] Specifically, if Figure 1 As shown, the method for replacing the guardrail of an operating line in this embodiment is used to replace the damaged position between the existing column 1 and the existing guardrail 2. The damaged position includes various occasions where the guardrail needs to be replaced, such as when the service life has exceeded, when it is severely damaged and there is a safety hazard of falling.

[0016] Specifically, the method for replacing the guardrail in this embodiment includes the following steps: 1) If Figure 1 As shown in the figure, the cut-out portion 8 is the location where the disease occurs between the existing column 1 and the existing railing 2, and the cut-out portion 8 is cut out.

[0017] 2) If Figure 2 As shown, column rebar 7 for connecting the newly erected column is carried out on the bridge deck corresponding to the cut-off portion 8. The position of the column rebar 7 is staggered with the position of the existing column 1 to ensure that the existing cable bracket is not affected during construction.

[0018] 3) If Figure 3 As shown, new columns 3 and the first prefabricated guardrail 4 are installed at the position of the column embedding reinforcement 7 and cast into an integral prefabricated structure.

[0019] In this embodiment, the new columns 3 and the first prefabricated guardrail 4 are prefabricated in blocks, which can be divided into 3 or more blocks in the height direction. The weight of a single block can be controlled at 60 kg, which is convenient for installation in operating lines without mechanical operation conditions.

[0020] In this embodiment, the newly-built column 3 adopts a 2 cm thick hollow section, and no formwork is required on site. It is placed at the position of the column embedded reinforcement 7, and ultra-high strength concrete material is poured in the hollow to connect with the bridge deck.

[0021] The guardrail replacement structure in this embodiment is only prefabricated columns 3 connected to the bridge deck by post-casting, and the prefabricated panels are directly connected by two upper and lower reserved 10 cm high hollow grooves or weather-resistant steel components by post-casting or welding.

[0022] 4) If Figure 4 As shown, cable brackets are installed on the newly erected columns 3 on both sides, and the cables on the existing columns 1 are moved to the newly erected columns 3. After completion, the existing columns between the newly erected columns on both sides are cut off to ensure that the cable lines can be used normally for operation during the replacement of the guardrail.

[0023] 5) If Figure 5As shown, the second prefabricated guardrail 5 is assembled between the newly installed first prefabricated guardrails 4 on both sides.

[0024] In this embodiment, the thickness of the first prefabricated parapet 4 and the second prefabricated parapet 5 is 4 cm, and a 3 mm steel mesh is arranged inside the plate, of which 2 cm is cantilevered outside the bridge cantilever as a drip structure.

[0025] During the specific implementation of this embodiment: embedded sound barrier parts can be simultaneously set on the newly replaced guardrail, which can be carried out simultaneously with the overhaul of the sound barrier, thus saving the cost of the later overhaul of the sound barrier.

[0026] The newly replaced guardrails are prefabricated and assembled using ultra-high-strength materials. They do not increase the load on the main structure and at the same time meet the later environmental requirements to increase the force demand for heightened sound barriers. Their durability can reach the same lifespan as the main structure, avoiding replacement again in the future.

[0027] Although the above embodiments have described in detail the concepts and embodiments of the present invention with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and changes can still be made to the present invention without departing from the scope of the claims, so they are not described one by one here.

Claims

1. A method for replacing a guardrail of an operating line, used to replace an existing guardrail that has exceeded its service life and is severely damaged, posing a potential safety hazard of falling, wherein the existing guardrail is provided with an existing column, and is characterized in that: The method for replacing the guardrail comprises the following steps: Cut off the railings where the disease occurs; Planting reinforcement bars for connecting newly erected columns on the bridge deck corresponding to the cut-off position, wherein the position of the planted reinforcement bars is staggered with the position of the existing columns; Installing a prefabricated new column at the position where the column is embedded with reinforcement and a first prefabricated guardrail cast as an integral structure with the new column; Cut off the existing columns between the new columns on both sides; The second prefabricated guardrail is assembled between the first prefabricated guardrails newly arranged on both sides.

2. A method for replacing railings of an operating line according to claim 1, characterized in that: Before the existing columns are removed, cable brackets are installed on the newly erected columns on both sides, and the cables on the existing columns are moved to the newly erected columns.

3. A method for replacing railings of an operating line according to claim 1, characterized in that: Sound barrier embedded parts for connecting with the sound barrier are embedded in the newly installed guardrail.

4. A method for replacing railings of an operating line according to claim 1, characterized in that: A wire mesh is arranged inside the newly installed guardrail, and a part of the newly installed guardrail is cantilevered outside the bridge cantilever as a drip structure.

5. The method for replacing railings of an operating line according to claim 1, characterized in that: The newly established column adopts a hollow section, and its hollow section is sleeved on the periphery of the column embedded reinforcement, and the newly established column is connected to the bridge deck by post-casting ultra-high-strength concrete material.

6. A method for replacing railings of an operating line according to claim 5, characterized in that: The newly erected column is divided into a plurality of prefabricated column segments along its height direction, and a plurality of the prefabricated column segments are assembled to form the newly erected column.

7. The method for replacing railings of an operating line according to claim 1, characterized in that: The first prefabricated guardrail of the prefabricated column and the second prefabricated guardrail are connected via a plate assembly joint.

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