Operation platform construction device and method in railway bridge hollow pier

Abstract

The invention relates to the technical field of bridge construction, and provides a railway bridge hollow pier inner operation platform construction device and a construction method.The railway bridge hollow pier inner operation platform construction device comprises a plurality of layers of outer formworks and a plurality of layers of inner formworks, the outer formworks are fastened to the inner formworks through opposite pull rods, the outer formworks are externally connected with an outer operation platform, and the outer operation platform is connected with an inner operation platform. An inner operation platform is connected in the inner formwork, a bottom-carrying protection platform is detachably connected to the position, below the inner formwork, of the inner wall of the formed hollow pier, the bottom-carrying protection platform comprises a frame, the frame is provided with a bag net, and ring ribs used for providing climbing treading supports and safety rope hanging points are arranged on the inner wall of the inner formwork in the circumferential direction. Through layered arrangement of the outer formwork and the inner formwork and matching of the inner operation platform, the outer operation platform, the bottom supporting protection platform and the ring ribs, all-directional protection of high-altitude operation is achieved, multi-layer circulation construction is adapted, the concrete forming quality is guaranteed, and construction safety and universality are improved.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and more specifically, to a construction device and method for an operating platform inside a hollow pier of a railway bridge. Background Technology

[0002] In modern railway construction, with the increasing span of lines and the complexity of terrain conditions, the application of high-pier bridges is becoming more and more widespread. Hollow piers, due to their light weight, high load-bearing capacity, excellent seismic performance, and ability to effectively save building materials, have become one of the core structural forms of high-pier bridges. The construction of hollow piers often adopts a multi-layer cyclic casting process, requiring the use of inner and outer formwork and turnover operations, along with specialized operating platforms and safety protection facilities for high-altitude construction. The structural rationality, adaptability, and safety protection performance of the construction equipment directly determine the quality of concrete pouring, construction efficiency, and the level of safety for high-altitude operations.

[0003] Currently, existing formwork and operating platform devices for hollow pier construction typically use standardized steel molds or fixed-size operating platforms. The poor compatibility between the formwork and the platform, cumbersome disassembly and relocation, and difficulty in adapting to the working surface requirements of different construction sections lead to low construction efficiency. Simultaneously, the formwork support system lacks stability, easily resulting in uneven stress on tie rods, formwork misalignment, or deformation, affecting the structural accuracy of the hollow pier. These problems collectively restrict the safety, efficiency, and versatility of hollow pier construction, making it difficult to meet the high standards of modern railway bridge engineering. Summary of the Invention

[0004] The purpose of this invention is to provide a construction device and method for an operating platform inside a hollow pier of a railway bridge, which solves the problems of poor adaptability, low efficiency, unstable support and insufficient forming accuracy of existing hollow pier construction.

[0005] This invention is achieved through the following technical solution: a construction device for an internal operating platform of a hollow pier for railway bridges, comprising an outer template and an inner template, with a cavity formed between the outer template and the inner template for concrete pouring to form the hollow pier, the outer template and the inner template being provided with several layers respectively, the outer template being fastened to the inner template by tie rods, and an outer operating platform being connected to the outside of the outer template;

[0006] An internal operating platform is connected to the inner formwork. The inner wall of the pre-formed hollow pier is detachably connected to a bottom protection platform below the inner formwork. The bottom protection platform includes a frame with a safety net. The inner wall of the inner formwork is circumferentially equipped with reinforcing bars to provide support for climbing and stepping and to provide safety rope attachment points.

[0007] Furthermore, the inner template has N layers and the outer template has M layers, where M = N + 1 and N is a positive integer not less than 2.

[0008] Furthermore, the number of layers of both the inner and outer formwork in the uncast section of the hollow pier is K, where K=N-1, and the remaining layers of the inner and outer formwork are set in the cast section of the hollow pier.

[0009] Furthermore, each inner template layer is equipped with an inner operating platform, and each outer template layer is equipped with an outer operating platform.

[0010] Furthermore, the internal operating platform is a horizontally scalable platform.

[0011] Furthermore, climbing cones are pre-embedded in the inner wall of the hollow pier, and hanging plates are connected to the climbing cones. The hanging plates are connected to the bottom protection platform by steel ropes.

[0012] Furthermore, the netting has two layers: the upper layer is a horizontal flexible netting, and the lower layer is a horizontal rigid netting.

[0013] Furthermore, the reinforcing rings are spaced apart along the height direction of the inner formwork, with at least one ring at the bottom, middle and top of the inner formwork.

[0014] Furthermore, the inner wall of the inner formwork is equipped with a ladder, and the inner formwork has openings for avoiding the ladder and for operators to pass through.

[0015] A construction method comprising the following steps: Step 1: Complete the pouring and curing of the first section of the hollow pier; Step 2: Lift the inner operating platform out of the hollow pier, remove the tie rods corresponding to the bottom inner formwork, lift out the bottom inner formwork, remove the bottom outer formwork, and then lift the bottom protection platform. Step 3: Install the internal operating platform and the internal formwork of the current construction section, then install the rebar positioning fixture, and sequentially lay out the inner rebar, outer rebar and stirrups to complete the corresponding connection of the tie bars. Finally, set the protective layer spacers at the preset positions of the rebar skeleton. Step 4: Install the outer formwork of the current construction section, set up and tighten the tie rods accordingly, and carry out the concrete pouring operation of the current construction section of the hollow pier; Step 5: After the concrete curing of the current construction section of the hollow pier reaches the standard, repeat steps 2 to 4.

[0016] The present invention has at least the following advantages and beneficial effects: (1) By setting up the outer and inner templates in layers, and combining the inner operating platform, outer operating platform, bottom protection platform and ring reinforcement, a comprehensive high-altitude operation safety guarantee system is formed, which reduces the risk of high-altitude operation, adapts to the multi-layer cyclic pouring process of hollow piers, and can flexibly meet the needs of different construction sections. It not only ensures the forming accuracy of concrete pouring, but also improves the safety and versatility of construction through the collaborative work of various components, providing a stable and safe operating environment for workers.

[0017] (2) After the first section is poured and cured, the process is carried out in a cycle of lifting out the inner operating platform, removing the inner formwork, removing the outer formwork, lifting the bottom protection platform, installing the formwork and laying the reinforcement before pouring. This not only reduces safety risks but also improves construction efficiency and ensures the forming accuracy and construction continuity of the hollow pier. Attached Figure Description

[0018] Figure 1 This invention provides a structural schematic diagram of a construction device for an operating platform inside a hollow pier of a railway bridge.

[0019] Figure 2 This is a half-sectional view of a construction device for an operating platform inside a hollow pier of a railway bridge, provided by the present invention.

[0020] Figure 3 For the present invention Figure 2 A magnified view of a portion of the image.

[0021] Figure 4 For the present invention Figure 3 A magnified view of a portion of the image.

[0022] Figure 5 This invention provides a schematic diagram of the bottom protection platform in a construction device for an operating platform inside a hollow pier of a railway bridge.

[0023] Attached reference numerals: 1-Outer template, 11-Outer operating platform, 2-Inner template, 21-Inner operating platform, 210-Opening, 22-Ring reinforcement, 23-Ladder, 24-Back bar, 3-Tie rod, 4-Bottom protection platform, 41-Frame, 42-Network, 43-Climbing cone, 44-Hanging plate, 45-Steel rope. Detailed Implementation

[0024] The specific implementation method is described below with reference to the accompanying drawings.

[0025] Example like Figures 1 to 5 As shown, in this embodiment, a construction device for an operating platform inside a hollow pier of a railway bridge is disclosed, including an outer template 1 and an inner template 2. A cavity for concrete pouring and forming a hollow pier is formed between the outer template 1 and the inner template 2. The outer template 1 and the inner template 2 are respectively provided with several layers. The outer template 1 is fastened to the inner template 2 by tie rods 3. An outer operating platform 11 is connected to the outside of the outer template 1. An inner operating platform 21 is connected inside the inner template 2. The inner wall of the formed hollow pier is detachably connected to a bottom protection platform 4 below the inner template 2. The bottom protection platform 4 includes a frame 41, and the frame 41 is provided with a net 42. The inner wall of the inner template 2 is provided with ring reinforcement 22 around the periphery for providing climbing and stepping support and safety rope hanging points.

[0026] Specifically, steel formwork is used as the outer formwork 1 and inner formwork 2, which are coaxially arranged to form an annular cavity for pouring concrete to form hollow piers. The outer formwork 1 and inner formwork 2 are connected and secured by horizontal tie rods 3, which are evenly distributed along the circumference of the formwork to ensure the relative position stability between the outer formwork 1 and inner formwork 2. The outer operating platform 11 is fixed to the outside of the outer formwork 1 by welding or bolting. The inner operating platform 21 is placed on the upper back bar 24 inside the inner formwork 2. The bottom protection platform 4 is detachably installed on the inner wall of the formed hollow pier 50cm below the lowest inner formwork 2. The frame 41 of the bottom protection platform 4 is welded from steel, and a net 42 is fixed on the frame 41. This system is adapted to the multi-layer cyclic construction requirements of hollow piers for railway bridges. Through the collaboration of multiple components, a safe operation system is formed, which not only ensures the quality of concrete pouring and forming but also provides comprehensive safety protection for operators, thereby improving construction safety.

[0027] Furthermore, in specific implementation, the inner formwork 2 provided in the embodiments of the present invention has N layers, and the outer formwork 1 has M layers, where M = N + 1, and N is not less than a positive integer of 2. Specifically, for example, when constructing a standard section of a hollow pier for a railway bridge in 4m increments, N = 3 (23 layers of inner formwork) is selected, corresponding to M = 4 (14 layers of outer formwork); if the height of the construction section is adjusted, N = 2 (22 layers of inner formwork) can be selected, corresponding to M = 3 (13 layers of outer formwork), to meet the adaptation requirements of different construction scenarios. Adjacent inner formwork 2 and adjacent outer formwork 1 are all fastened with bolts. Through the layer ratio, it is ensured that the outer formwork 1 is always one layer more than the inner formwork 2, providing a stable support for subsequent formwork removal operations, while adapting to the cyclic removal and installation logic of multi-layer formwork, ensuring the overall stability of the formwork support system during construction.

[0028] Furthermore, in specific implementation, the inner formwork 2 and outer formwork 1 provided in this embodiment of the invention are arranged in K layers on the uncast section of the hollow pier, where K=N-1, and the remaining layers of the inner formwork 2 and outer formwork 1 are arranged on the cast-in-place section of the hollow pier. Specifically, taking N=3, M=4 as an example, K=2, the inner formwork 2 is arranged in 2 layers on the uncast section and 1 layer on the cast-in-place section, and the outer formwork 1 is arranged in 2 layers on the uncast section and 2 layers on the cast-in-place section. This ensures that the inner formwork 2 and outer formwork 1 on the cast-in-place section are tightly fitted with the hardened concrete, providing reliable lateral restraint. The formwork on the uncast section meets the casting requirements of the current construction section, achieving a balance between construction continuity and structural stability, and avoiding the risk of formwork instability.

[0029] Furthermore, in specific implementation, each inner template 2 layer of the present invention is provided with an inner operating platform 21, and each outer template 1 layer is provided with an outer operating platform 11. Specifically, one inner operating platform 21 is arranged for each inner template 2 layer, and one outer operating platform 11 is arranged for each outer template 1 layer. The inner operating platforms 21 are evenly arranged along the height direction of the inner template 2, with a spacing of 2m between adjacent layers. The outer operating platforms 11 are fixed to the outer wall of the outer template 1 and are vertically staggered with the inner operating platforms 21 to achieve full coverage of the operating surface of each working layer. Operators can carry out demolding, rebar installation and other operations on the corresponding level platform without the need to set up additional temporary working surfaces, simplifying the construction process and improving the stability and safety of the operation process.

[0030] Furthermore, in specific implementation, the internal operating platform 21 provided in this embodiment of the invention is a horizontally telescopic platform. Specifically, the internal operating platform 21 can adopt a horizontally telescopic structure combining a main frame and a telescopic sub-frame. The telescopic sub-frame is slidably connected to the main frame through movable plug-in or snap-fit, and its extension length can be adjusted according to the working surface width of the current construction section. The extension length of the internal operating platform 21 is fixed by bolt locking, adapting to the size requirements of different construction sections, improving the versatility of the device, and facilitating hoisting and disassembly in the retracted state, reducing the difficulty of transportation and installation during construction, and improving construction efficiency.

[0031] Furthermore, in specific implementation, a climbing cone 43 is pre-embedded in the inner wall of the hollow pier provided in the embodiment of the present invention. The climbing cone 43 is connected to a hanging plate 44, and the hanging plate 44 is connected to the bottom protection platform 4 via a steel cable 45. Specifically, during the concrete construction of the already poured section of the hollow pier, the climbing cone 43 is pre-embedded in a preset position. The climbing cone 43 is firmly integrated with the concrete structure. The hanging plate 44 is detachably connected to the climbing cone 43 via bolts. The two ends of the steel cable 45 are respectively fixed to the connection points of the hanging plate 44 and the frame 41 of the bottom protection platform 4, which are evenly distributed around the circumference. This achieves reliable fixing and convenient disassembly of the bottom protection platform 4, facilitating the lifting and adjustment of the bottom protection platform 4 and adapting to the height change requirements of multi-layer cyclic construction. At the same time, the connection structure between the climbing cone 43 and the hanging plate 44 has a strong load-bearing capacity, ensuring the safety and stability of the protection platform.

[0032] Furthermore, in specific implementation, the aforementioned safety net 42 provided in this embodiment of the invention has two layers: an upper layer of flexible horizontal netting and a lower layer of rigid horizontal netting. Specifically, the safety net 42 consists of two layers: an upper layer of flexible netting made of high-strength nylon and a lower layer of rigid netting made of steel mesh or anti-slip steel grating. Both layers of safety netting 42 are tightly fixed to the frame 41 of the bottom protection platform 4, and the gap between the edges and the inner wall of the hollow pier is controlled within a safe range, forming a double protection system. In the event of an accidental fall, the flexible netting first buffers and absorbs the impact, and then the rigid netting provides stable support, significantly reducing the severity of fall injuries and meeting the safety protection requirements for high-altitude operations.

[0033] Furthermore, in specific implementation, the aforementioned reinforcing rings 22 provided in this embodiment of the invention are spaced apart along the height direction of the inner formwork 2, with at least one ring at the bottom, middle, and top of the inner formwork 2. Specifically, the reinforcing rings 22 are made of plain round steel bars, and are fixedly connected to the inner wall of the inner formwork 2. The surface is polished smooth to avoid scratching operators, providing stable footholds for operators to climb up and down, and safety rope attachment points ensure adequate protection for personnel during operation. This frees up the hands for operations such as formwork dismantling, formwork inspection, or concrete pouring, improving operational convenience and safety.

[0034] Furthermore, in a specific implementation, a ladder 23 is provided on the inner wall of the inner template 2 provided in the embodiment of the present invention. The inner template 2 has openings 210 for avoiding the ladder 23 and for the passage of operators. Specifically, the ladder 23 and the inner template 2 are integrated into one design. The ladder 23 is fixed vertically along the inner wall of the inner template 2. Corresponding to the position of the operating platform 21 on each floor, the inner template 2 has openings 210 that are adapted to the ladder 23. At the same time, the size of the openings 210 meets the passage requirements of operators, forming a continuous safe passage to each working floor. There is no need to build an additional independent ladder 23, which simplifies the device structure and reduces construction costs. At the same time, the adaptation design of the openings 210 and the ladder 23 ensures smooth passage and avoids collisions or interference during operation.

[0035] In this embodiment, a construction method is also disclosed, including the following steps: Step 1: Complete the pouring and curing of the first section of the hollow pier; Step 2: Lift the inner operating platform 21 out of the hollow pier, remove the tie rods 3 corresponding to the bottom inner formwork 2, and after lifting the bottom inner formwork 2 out, remove the bottom outer formwork 1, and then lift the bottom protection platform 4; Specifically, lift the inner operating platform 21 out one by one in the order from top to bottom to make room for the subsequent lifting of the inner formwork 2. Then, one operator goes down to the bottom protection platform 4 via the ladder 23, and another operator stands on the bottom outer operating platform 11. The two people remove the tie rods 3 corresponding to the bottom inner formwork 2, and after releasing the restraint, lift the bottom inner formwork 2 out, then remove the bottom outer formwork 1, and finally adjust and lift the bottom protection platform 4 to the preset position of the climbing cone 43 below the current construction section using the lifting device; Step 3: Install the inner operating platform 21 and the inner formwork 2 of the current construction section, then install the rebar positioning fixture, and sequentially lay out the inner rebar, outer rebar and stirrups to complete the corresponding connection of the tie bars. Finally, set the protective layer spacers at the preset positions of the rebar cage. Specifically, first install the inner operating platform 21 of the already poured section, then install the inner formwork 2 and the inner operating platform 21 of the current construction section, then install the rebar positioning fixture, and sequentially lay out the inner rebar, outer rebar and stirrups. Complete the connection of the tie bars by binding or welding, and place the protective layer spacers at the preset positions of the rebar cage to ensure the installation accuracy of the rebar. Step 4: Install the outer formwork 1 of the current construction section, and install and tighten the tie rods 3 accordingly to ensure that the formwork joints are tight and the support is stable. Then, carry out the concrete pouring operation of the current construction section of the hollow pier. Step 5: After the concrete curing of the current construction section of the hollow pier meets the standards, repeat steps 2 to 4. The construction of each standard section is carried out cyclically. The process is standardized and orderly; the formwork removal sequence and formwork retention requirements conform to the structural stability logic; dual-person collaborative operation and double protection design ensure construction safety; the cyclical construction mode improves construction efficiency; and it is suitable for the actual needs of multi-layer construction of hollow piers for railway bridges.

Claims

1. A construction device for an internal operating platform of a hollow pier for railway bridges, comprising an outer formwork (1) and an inner formwork (2), wherein a cavity for concrete pouring and forming the hollow pier is formed between the outer formwork (1) and the inner formwork (2), characterized in that, The outer template (1) and the inner template (2) are respectively provided with several layers. The outer template (1) is fastened to the inner template (2) by tie rods (3). An external operating platform (11) is connected to the outer template (1). An inner operating platform (21) is connected inside the inner template (2). The inner wall of the formed hollow pier is detachably connected to a bottom protection platform (4) below the inner template (2). The bottom protection platform (4) includes a frame (41). The frame (41) is provided with a net (42). The inner wall of the inner template (2) is provided with a ring reinforcement (22) around the periphery for providing climbing and stepping support and safety rope hanging points.

2. The construction device for an operating platform inside a hollow pier of a railway bridge according to claim 1, characterized in that, The inner template (2) has N layers, and the outer template (1) has M layers, where M = N + 1, and N is not less than a positive integer of 2.

3. The construction device for an operating platform inside a hollow pier of a railway bridge according to claim 2, characterized in that, The inner template (2) and the outer template (1) are set in the uncast section of the hollow pier in K layers, where K=N-1, and the remaining layers of the inner template (2) and the outer template (1) are set in the cast section of the hollow pier.

4. The construction device for an operating platform inside a hollow pier of a railway bridge according to claim 2, characterized in that, Each inner template (2) is provided with an inner operating platform (21), and each outer template (1) is provided with an outer operating platform (11).

5. A construction device for an operating platform inside a hollow pier of a railway bridge according to claim 1, characterized in that, The internal operating platform (21) is a horizontally scalable platform.

6. A construction device for an operating platform inside a hollow pier of a railway bridge according to claim 1, characterized in that, The hollow pier has a climbing cone (43) embedded in its inner wall. The climbing cone (43) is connected to a hanging plate (44). The hanging plate (44) is connected to the bottom protection platform (4) by a steel rope (45).

7. A construction device for an operating platform inside a hollow pier of a railway bridge according to claim 1, characterized in that, The net (42) has two layers, the upper layer of which is a horizontal flexible net and the lower layer of which is a horizontal rigid net.

8. A construction device for an operating platform inside a hollow pier of a railway bridge according to claim 1, characterized in that, The ring reinforcement (22) is arranged at intervals along the height direction of the inner template (2), and at least one ring is provided at the bottom, middle and top of the inner template (2).

9. A construction device for an operating platform inside a hollow pier of a railway bridge according to claim 1, characterized in that, The inner wall of the inner template (2) is provided with a ladder (23), and the inner template (2) has an opening (210) for avoiding the ladder (23) and for the operator to pass through.

10. A construction method for a construction device for an operating platform inside a hollow pier of a railway bridge, based on any one of claims 2-4, characterized in that, Includes the following steps: Step 1: Complete the pouring and curing of the hollow pier described in the first section; Step 2: Lift the inner operating platform (21) out of the hollow pier, remove the tie rod (3) corresponding to the bottom inner template (2), lift the bottom inner template (2) out, remove the bottom outer template (1), and then lift the bottom protection platform (4). Step 3: Install the inner operating platform (21) and the inner formwork (2) of the current construction section, then install the steel bar positioning tool, and arrange the inner steel bar, outer steel bar and stirrup in sequence to complete the corresponding connection of the tie bar. Finally, set the protective layer pad at the preset position of the steel bar skeleton. Step 4: Install the outer formwork (1) of the current construction section, arrange the tie rods (3) accordingly and tighten them, and carry out the concrete pouring operation of the hollow pier in the current construction section; Step 5: After the concrete curing of the current construction section of the hollow pier reaches the standard, repeat steps 2 to 4.

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