Construction method of bridge sidewalk overhang part

Abstract

The embodiment of the application provides a bridge sidewalk overhang position construction method, and relates to the road construction engineering technical field.The application comprises the following steps: S1, construction preparation: correcting the embedded steel bars of the bridge top plate before construction, and preparing the construction materials and construction equipment; S2, overhang support system processing and installation: processing and installing the balance lever steel bars, fulcrum steel bars and U-shaped fixed steel bars; S3, overhang position bottom formwork processing and installation; S4, overhang position steel bar binding; S5, overhang position side formwork installation; and S6, concrete pouring and maintenance.The application can improve the bridge sidewalk overhang position construction speed, save a large amount of mechanical and labor costs, and eliminate the safety hidden dangers such as high-altitude falling and mechanical injury existing in the bridge overhang position construction process.

Description

Technical Field

[0001] This invention relates to the field of road construction engineering technology, and more specifically, to a construction method for the cantilevered section of a bridge sidewalk. Background Technology

[0002] Cantilevered sidewalks are typically located near water or cliffs. They extend outwards from the road to widen the road for pedestrians or sightseeing.

[0003] The inventors discovered that existing bridge cantilever construction methods involve using channel steel and I-beams to erect cantilever platforms, which results in slow construction speeds, heavy channel steel and I-beams, significant safety hazards from erecting operating platforms at heights, and lengthy dismantling and assembly times, severely impacting the overall bridge construction progress and failing to meet actual construction needs. Summary of the Invention

[0004] The objectives of this invention include, for example, providing a construction method for cantilevered sections of bridge pedestrian walkways, which can improve the construction speed of cantilevered sections of bridge pedestrian walkways, save a significant amount of machinery and labor costs, and eliminate safety hazards such as falls from heights and mechanical injuries during the construction of cantilevered sections of bridges.

[0005] This invention provides a construction method for cantilevered sections of a bridge pedestrian walkway, comprising the following steps:

[0006] S1. Construction preparation: Before construction, the pre-embedded steel bars in the top slab are corrected, and construction materials and equipment are prepared.

[0007] S2. Fabrication and installation of cantilever support system: Fabrication and installation of lever reinforcement, fulcrum reinforcement and U-shaped reinforcement;

[0008] S3. Processing and installation of bottom formwork for cantilevered sections: Install the bottom formwork;

[0009] S4. Reinforcing steel binding at cantilevered sections;

[0010] S5. Installation of side formwork for cantilevered sections;

[0011] S6. Concrete pouring and curing.

[0012] In an optional implementation, step S2 is performed as follows:

[0013] S2-1, Lever reinforcement processing: Cut the reinforcement bars to the same length, weld the two reinforcement bars together, and leave a gap between the two reinforcement bars;

[0014] S2-2, Processing of support reinforcement: Cut the reinforcement into long and short reinforcements according to different lengths, and weld the long and short reinforcements vertically, with the short reinforcement close to one end of the long reinforcement;

[0015] S2-3, U-shaped steel bar processing: bending the steel bars into circles;

[0016] S2-4. Installation of support reinforcement and U-shaped reinforcement: At intervals along the longitudinal direction of the bridge, weld the U-shaped reinforcement and support reinforcement to the pre-embedded reinforcement in the top slab along the transverse direction of the bridge.

[0017] S2-5, Lever reinforcement installation: Pass one end of the lever reinforcement through the U-shaped reinforcement and abut against the U-shaped reinforcement. Place the lever reinforcement on the fulcrum reinforcement, engage the long reinforcement with the gap, and abut the lever reinforcement against the short reinforcement.

[0018] In an optional implementation, the support reinforcement in steps S2-4 corresponds to the middle position of the U-shaped reinforcement.

[0019] In an optional implementation, the height of the support reinforcement relative to the bridge deck in steps S2-4 is greater than the height of the U-shaped reinforcement relative to the bridge deck.

[0020] In an optional implementation, step S3 is performed as follows:

[0021] S3-1. Processing of bottom formwork for cantilevered sections: Select a wooden formwork with good flatness and sufficient rigidity to process the bottom formwork. Cut it according to the dimensions in the construction drawings and drill holes near the edge of the bottom formwork.

[0022] S3-2, Installation of bottom formwork for cantilever section: The tie rod reinforcement is passed through the hole and the bottom formwork is fixed to the lever reinforcement at the end away from the U-shaped reinforcement. The two ends of the tie rod reinforcement are fixed to the bottom formwork and the lever reinforcement respectively.

[0023] In an optional embodiment, the bottom of the bottom template is fixedly connected with reinforcing ribs in step S3-1.

[0024] In an optional implementation, the edge of the bottom template abuts against the edge of the bridge deck in step S3-2.

[0025] In an optional implementation, in step S3-2, the two ends of the tie rod reinforcing bar pass through the gap of the lever reinforcing bar and the hole of the bottom template, respectively, and the protruding parts of the tie rod reinforcing bar are fixed to the lever reinforcing bar and the bottom template by butterfly buckles, respectively.

[0026] In an optional implementation, in step S3-2, the height of the tie rod reinforcement relative to the bridge deck is greater than the height of the support reinforcement relative to the bridge deck.

[0027] In an optional implementation, the specific process of step S5 is as follows:

[0028] According to the construction drawings, the wooden boards are cut to obtain the side templates. Holes are drilled in the side templates, and the fixing steel bars are passed through the holes and fixed to the side templates. The fixing steel bars are welded to the pre-embedded steel bars in the top plate so that the side templates are perpendicular to the bridge deck.

[0029] The beneficial effects of this invention are:

[0030] This invention utilizes reinforcing steel bars as fulcrums, fixing one end to the original bridge deck with U-shaped steel bars, while hoisting the cantilever section formwork to one side of the bridge at the other end. The operation is simple, increasing the construction speed of cantilevered pedestrian walkways on bridges. This method uses common materials such as reinforcing steel bars and wooden planks, reducing the consumption of materials like I-beams and channel steel, and saving significant machinery and labor costs. By implementing this method, traditional bridge cantilever construction is transformed, eliminating safety hazards such as falls from heights and mechanical injuries during the construction of cantilevered sections. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a side view of the construction structure of the cantilevered section of a bridge pedestrian walkway provided in an embodiment of the present invention;

[0033] Figure 2 This is a flowchart illustrating the construction of the cantilevered section of a bridge pedestrian walkway, as provided in an embodiment of the present invention.

[0034] Icons: 100 - Construction structure of the cantilevered section of the bridge pedestrian walkway; 10 - Original bridge deck; 20 - Cantilever support system; 21 - U-shaped reinforcement; 22 - Support reinforcement; 23 - Lever reinforcement; 24 - Tie rod reinforcement; 30 - Bottom formwork. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0039] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0040] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0041] Please refer to Figure 1 This embodiment provides a construction structure 100 for a cantilevered section of a bridge pedestrian walkway, which is constructed on the original bridge deck 10. It includes a cantilever support system 20 and the cantilevered section. Pre-embedded reinforcing bars (not shown) are fixed to the original bridge deck 10. The cantilever support system 20 includes lever reinforcing bars 23, fulcrum reinforcing bars 22, and U-shaped reinforcing bars 21. The cantilevered section includes a bottom formwork 30 and side formwork (not shown). The U-shaped reinforcing bars 21 and fulcrum reinforcing bars 22 are fixedly connected to the pre-embedded reinforcing bars in the top slab. The lever reinforcing bars 23 pass through and abut against the U-shaped reinforcing bars 21, and are placed on the fulcrum reinforcing bars 22. The other end of the lever reinforcing bars 23 is used to suspend the bottom formwork 30 via tie rod reinforcing bars 24. The side formwork is located on the side of the bottom formwork 30 away from the bridge and is perpendicular to the bottom formwork 30.

[0042] Specifically, the U-shaped reinforcing bar 21 is formed by bending a single reinforcing bar into a circle, with both ends fixedly connected to the pre-embedded reinforcing bars in the top slab of the bridge deck, and its bent portion facing upwards. The central support reinforcing bar 22 includes a long reinforcing bar and a short reinforcing bar, which are welded vertically together. One end of the long reinforcing bar is fixedly connected to the pre-embedded reinforcing bars in the top slab. The short reinforcing bar is welded to the end near the upward-facing end of the long reinforcing bar and is used to place the lever reinforcing bar 23. The lever reinforcing bar 23 is formed by welding two reinforcing bars of the same length, with the two bars spaced apart and leaving a gap (not shown in the figure). One end of the lever reinforcing bar 23 abuts against the bent portion of the U-shaped reinforcing bar 21. The long reinforcing bar is inserted into the gap of the lever reinforcing bar 23. The lever reinforcing bar 23 abuts against the short reinforcing bar.

[0043] Furthermore, the U-shaped steel bar 21 and the support steel bar 22 are arranged in the transverse direction of the bridge, and the support steel bar 22 corresponds to the middle position of the bent portion of the U-shaped steel bar 21. It should be noted that in this embodiment, multiple parallel and spaced cantilever support systems 20 and cantilevered portions are included. Optionally, in this embodiment, the height of the support steel bar 22 relative to the bridge deck is greater than the height of the U-shaped steel bar 21 relative to the bridge deck.

[0044] In this embodiment, the bottom template 30 is cut from a wooden board and has holes. The tie rod 24 passes through the holes in the bottom template 30, and both ends of the tie rod 24 are fixedly connected to the bottom template 30 and the lever 23, respectively. Specifically, both ends of the tie rod 24 pass through the gaps in the lever 23 and the holes in the bottom template 30, respectively, and the protruding parts at both ends are fixedly connected to the lever 23 and the bottom template 30, respectively, by butterfly buckles.

[0045] Optionally, the bottom of the bottom template 30 is provided with reinforcing ribs. In this embodiment, the reinforcing ribs are made of timber.

[0046] Similarly, in this embodiment, the side template is also cut from a wooden board with holes. A fixing reinforcing bar (not shown) passes through the holes in the side template and is fixed to it. The other end of the fixing reinforcing bar is welded to the pre-embedded reinforcing bar in the top slab, making the side template perpendicular to the bottom template 30.

[0047] Please refer to Figure 2 This embodiment also provides a construction method for the cantilevered section of a bridge pedestrian walkway:

[0048] S1. Construction Preparation: Before commencing construction on the cantilever section, the pre-embedded reinforcing bars in the top slab must be aligned to ensure that their spacing and length meet design and specification requirements. This is to prevent movement of the U-shaped reinforcing bars 21 and support reinforcing bars 22 after welding, which could affect subsequent construction. Materials preparation work must be carried out strictly according to the requirements for the construction of the cantilevered section of the sidewalk, ensuring that all necessary construction materials and equipment are ready.

[0049] S2, Cantilever Support System 20: Fabrication and installation of balance lever reinforcement 23, fulcrum reinforcement 22 and U-shaped fixing reinforcement.

[0050] S2-1, Processing of counterbalance lever reinforcement 23: Cut φ22 threaded steel bars into 1m lengths. Weld two bars together for fixation. The spacing between the two bars should be controlled at 3-6cm to facilitate the passage of subsequent support reinforcement 22 and tie rod reinforcement 24.

[0051] S2-2, Fabrication of Support Reinforcing Bar 22: The support reinforcing bar 22 is made by vertically welding two sections of φ22 threaded steel. The two ends of the reinforcing bar are a long reinforcing bar and a short reinforcing bar, respectively. The short reinforcing bar is 10cm long and the long reinforcing bar is 40cm long. During welding, the short reinforcing bar is welded 5cm away from the top of the long reinforcing bar.

[0052] S2-3, U-shaped steel bar 21 processing: obtained by bending a 12mm scrap steel bar into a circle.

[0053] S2-4, Support Reinforcing Bar 22, U-shaped Reinforcing Bar 21 Installation: After the required reinforcing bars are processed, weld the U-shaped fixed reinforcing bars and support reinforcing bars 22 to the pre-embedded reinforcing bars on the top slab of the bridge along the longitudinal direction of the bridge at intervals.

[0054] S2-5, Installation of Lever Reinforcing Bar 23: Pass one end of the lever reinforcing bar 23 through the U-shaped reinforcing bar 21 and abut it against the U-shaped reinforcing bar 21. Place the lever reinforcing bar 23 on the fulcrum reinforcing bar 22. Engage the long reinforcing bar with the gap, and abut the balancing lever reinforcing bar 23 against the short reinforcing bar. Complete the installation of the cantilever support system 20.

[0055] S3. Processing and installation of bottom formwork 30 for cantilevered sections: Fabricate and install the bottom formwork 30.

[0056] S3-1. Processing of the bottom formwork 30 for the cantilever section: Select a wooden formwork with good flatness and sufficient rigidity for processing. Cut the formwork to the dimensions shown in the construction drawings to obtain the bottom formwork 30. After cutting, add two wooden strips as reinforcing ribs to the bottom of the bottom formwork 30. Drill holes 10cm from the edge of the bottom formwork 30.

[0057] S3-2, the tie rod 24 passes through the hole in the bottom formwork 30, fixing the bottom formwork 30 to the lever 23 at the end away from the U-shaped bar 21. The two ends of the tie rod 24 are then fixed to the bottom formwork 30 and the lever 23 respectively using butterfly buckles. This prevents slippage, increases strength, and provides gravity support for subsequent bar binding and concrete pouring.

[0058] S4. Reinforcement binding of cantilevered sections: After the bottom formwork 30 of the cantilevered section is installed, the reinforcement of the cantilevered section of the sidewalk is bound according to the construction drawings, and concrete spacers are installed to ensure that the reinforcement protective layer meets the requirements.

[0059] S5. Installation of Side Formwork for Cantilevered Sections: After the reinforcement of the cantilevered section has passed inspection, the side formwork is installed. The wooden boards are cut according to the construction drawings to obtain the side formwork. Holes are drilled in the side formwork. The fixing reinforcement is passed through the holes in the side formwork and fixed to it. The fixing reinforcement is welded to the pre-embedded reinforcement in the top slab, ensuring the side formwork is vertically installed on the outside of the bottom formwork 30.

[0060] S6. Concrete Pouring and Curing: After the formwork of the cantilever section has passed inspection, a water truck is used to moisten the bridge concrete and formwork. Concrete pouring is then carried out. During concrete pouring, wooden planks are set up as operating platforms for concrete vibration to prevent construction workers from directly stepping on the reinforcing steel, which could cause deformation and affect construction quality.

[0061] The beneficial effects of the construction method for the cantilevered section of a bridge pedestrian walkway provided in this embodiment are:

[0062] This invention uses reinforcing steel bar 22 as a fulcrum, with one end fixed to the original bridge deck 10 by U-shaped reinforcing steel bar 21, and the other end of the cantilever section formwork hoisted to one side of the bridge. The operation is simple and improves the construction speed of the cantilevered pedestrian walkway section. The materials used in this invention are common materials such as reinforcing steel bars and wooden boards, reducing the consumption of materials such as I-beams and channel steel, and saving significant machinery and labor costs. By implementing this method, the traditional bridge cantilever construction method is changed, eliminating safety hazards such as falls from heights and mechanical injuries during the construction of cantilevered sections of bridges.

[0063] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A construction method for cantilevered sections of a bridge pedestrian walkway, characterized in that, Includes the following steps: S1. Construction preparation: Before construction, the pre-embedded steel bars in the top slab are corrected, and construction materials and equipment are prepared. S2. Fabrication and installation of cantilever support system: Fabrication and installation of lever reinforcement, fulcrum reinforcement, and U-shaped reinforcement; S2-1, Lever reinforcement processing: Cut the reinforcement bars to the same length, weld the two reinforcement bars together, and leave a gap between the two reinforcement bars; S2-2, Processing of fulcrum reinforcement: Cut the reinforcement into long and short bars according to different lengths, weld the long and short bars vertically, fix one end of the long bar to the pre-embedded reinforcement, and weld the short bar to the end of the long bar that faces upwards, for placing the lever reinforcement. S2-3, U-shaped steel bar processing: bending the steel bars into circles; S2-4. Installation of support reinforcement and U-shaped reinforcement: At intervals along the longitudinal direction of the bridge, weld the U-shaped reinforcement and support reinforcement to the pre-embedded reinforcement in the top slab along the transverse direction of the bridge. S2-5, Lever reinforcement installation: Pass one end of the lever reinforcement through the U-shaped reinforcement and abut against the U-shaped reinforcement. Place the lever reinforcement on the fulcrum reinforcement, engage the long reinforcement with the gap, and abut the lever reinforcement against the short reinforcement. S3. Processing and installation of bottom formwork for cantilevered sections: Install the bottom formwork; S4. Reinforcing steel binding at cantilevered sections; S5. Installation of side formwork for cantilevered sections; S6. Concrete pouring and curing.

2. The construction method for the cantilevered portion of a bridge pedestrian walkway according to claim 1, characterized in that, In steps S2-4, the support reinforcement and the U-shaped reinforcement are positioned at their midpoints.

3. The construction method for the cantilevered portion of a bridge pedestrian walkway according to claim 1, characterized in that, In step S2-4, the height of the support reinforcement relative to the bridge deck is greater than the height of the U-shaped reinforcement relative to the bridge deck.

4. The construction method for the cantilevered portion of a bridge pedestrian walkway according to claim 1, characterized in that, The specific process of step S3 is as follows: S3-1. Processing of bottom formwork for cantilevered sections: Select a wooden formwork with good flatness and sufficient rigidity to process the bottom formwork. Cut it according to the dimensions in the construction drawings and drill holes near the edge of the bottom formwork. S3-2, Installation of bottom formwork for cantilever section: The tie rod reinforcement is passed through the hole and the bottom formwork is fixed to the lever reinforcement at the end away from the U-shaped reinforcement. The two ends of the tie rod reinforcement are fixed to the bottom formwork and the lever reinforcement respectively.

5. The construction method for the cantilevered portion of a bridge pedestrian walkway according to claim 4, characterized in that, In step S3-1, the bottom of the bottom template is fixedly connected with reinforcing ribs.

6. The construction method for the cantilevered portion of a bridge pedestrian walkway according to claim 4, characterized in that, In step S3-2, the edge of the bottom template abuts against the edge of the bridge deck.

7. The construction method for the cantilevered portion of a bridge pedestrian walkway according to claim 4, characterized in that, In step S3-2, the two ends of the tie rod steel bar pass through the gap of the lever steel bar and the hole of the bottom template, respectively. The protruding parts of the tie rod steel bar are fixed to the lever steel bar and the bottom template by butterfly buckles, respectively.

8. The construction method for the cantilevered portion of a bridge pedestrian walkway according to claim 4, characterized in that, In step S3-2, the height of the tie rod reinforcement relative to the bridge deck is greater than the height of the support reinforcement relative to the bridge deck.

9. The construction method for the cantilevered portion of a bridge pedestrian walkway according to claim 1, characterized in that, The specific process of step S5 is as follows: According to the construction drawings, the wooden boards are cut to obtain the side template. Holes are drilled in the side template, and the fixing steel bars are passed through the holes and fixed to the side template. The fixing steel bars are then welded to the pre-embedded steel bars in the top plate to make the side template perpendicular to the bridge deck.

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